COMPRESSOR AND CONTROLLING METHOD OF VOLUME RATIO THEREOF

Abstract

A compressor and a controlling method of a volume ratio thereof. The compressor includes a body, a screw compression group, a volume adjusting group, a driving group, and a control module. The body has an intake end and a discharge end relative to the intake end. The screw compression group is disposed in the body. The volume adjusting group is disposed in the body, corresponding to the screw compression group. The driving group is coupled to the volume adjusting group and configured for driving the volume adjusting group to adjust the volume ratio. The control module is electrically connected to the driving group and configured for detecting operation statuses of preceding and following time sequences and recording the same as corresponding evaluation indicators. Based on a comparison result of the evaluation indicators, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio.

Claims

1. A controlling method of a volume ratio of a compressor, comprising: receiving an initiation command; setting an adjustment flag to a preset flag value; recording a previous evaluation indicator; performing a determination and an adjustment, comprising: waiting for a preset time; recording a current evaluation indicator; determining whether the current evaluation indicator conforms to a preset condition as compared to the previous evaluation indicator; if the current evaluation indicator conforms to the preset condition, maintaining the adjustment flag as the preset flag value, and if the current evaluation indicator does not conform to the preset condition, setting the adjustment flag to a reverse flag value; and determining whether the adjustment flag is the preset flag value, if so, performing the adjustment in a same direction as the preset flag value, and if not, performing the adjustment in a reverse direction to the preset flag value; and updating the previous evaluation indicator and repeatedly performing the determination and the adjustment.

2. The controlling method of the volume ratio of the compressor according to claim 1, wherein the determination and the adjustment further comprises: after determining whether the current evaluation indicator conforms to the preset condition as compared to the previous evaluation indicator, determining whether a same-direction adjustment count is less than a preset count; if the same-direction adjustment count is less than the preset count, updating the same-direction adjustment count; and if the same-direction adjustment count is greater than or equal to the preset count, setting the adjustment flag to the reverse flag value and resetting the same-direction adjustment count to zero.

3. The controlling method of the volume ratio of the compressor according to claim 2, wherein updating the same-direction adjustment count comprises adding one count to the same-direction adjustment count.

4. The controlling method of the volume ratio of the compressor according to claim 2, further comprising: after receiving the initiation command, resetting the same-direction adjustment count to zero.

5. The controlling method of the volume ratio of the compressor according to claim 1, wherein updating the previous evaluation indicator comprises replacing the previous evaluation indicator with the current evaluation indicator.

6. The controlling method of the volume ratio of the compressor according to claim 1, wherein the previous evaluation indicator and the current evaluation indicator comprise a current, a power, or a performance.

7. The controlling method of the volume ratio of the compressor according to claim 1, wherein the preset condition is the current evaluation indicator being superior to or equal to the previous evaluation indicator.

8. The controlling method of the volume ratio of the compressor according to claim 7, wherein the current evaluation indicator being superior to or equal to the previous evaluation indicator comprises a current operating current being lower than or equal to a previous operating current, a current consumed power being lower than or equal to a previous consumed power, or a current performance being superior to or equal to a previous performance.

9. A compressor, comprising: a body, having an intake end and a discharge end relative to the intake end; a screw compression group, disposed in the body; a volume adjusting group, disposed in the body and corresponding to the screw compression group; a driving group, coupled to the volume adjusting group and used to drive the volume adjusting group to adjust a volume ratio; and a control module, electrically connected to the driving group and used to detect a plurality of operation statuses of a preceding time sequence and a following time sequence and record the same as a plurality of corresponding evaluation indicators, wherein based on a comparison result of the plurality of evaluation indicators of the preceding time sequence and the following time sequence, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio.

10. The compressor according to claim 9, wherein the control module is used to: receive an initiation command; set an adjustment flag to a preset flag value; record a previous evaluation indicator; perform a determination and an adjustment, comprising waiting for a preset time; recording a current evaluation indicator; determining whether the current evaluation indicator conforms to a preset condition as compared to the previous evaluation indicator; if the current evaluation indicator conforms to the preset condition, maintaining the adjustment flag as the preset flag value, and if the current evaluation indicator does not conform to the preset condition, setting the adjustment flag to a reverse flag value; and determining whether the adjustment flag is the preset flag value, if so, performing the adjustment in a same direction as the preset flag value, and if not, performing the adjustment in a reverse direction to the preset flag value; and updating the previous evaluation indicator and repeatedly performing the determination and the adjustment.

11. The compressor according to claim 10, wherein the control module is further used to: after determining whether the current evaluation indicator conforms to the preset condition as compared to the previous evaluation indicator, determine whether a same-direction adjustment count is less than a preset count; if the same-direction adjustment count is less than the preset count, update the same-direction adjustment count; and if the same-direction adjustment count is greater than or equal to the preset count, set the adjustment flag to the reverse flag value and reset the same-direction adjustment count to zero.

12. The compressor according to claim 11, wherein updating the same-direction adjustment count comprises adding one count to the same-direction adjustment count.

13. The compressor according to claim 10, wherein updating the previous evaluation indicator comprises replacing the previous evaluation indicator with the current evaluation indicator.

14. The compressor according to claim 10, wherein the previous evaluation indicator and the current evaluation indicator comprise a current, a power, or a performance.

15. The compressor according to claim 10, wherein the preset condition is the current evaluation indicator being superior to or equal to the previous evaluation indicator.

16. The compressor according to claim 15, wherein the current evaluation indicator being superior to or equal to the previous evaluation indicator comprises a current operating current being lower than or equal to a previous operating current, a current consumed power being lower than or equal to a previous consumed power, or a current performance being superior to or equal to a previous performance.

17. The compressor according to claim 10, wherein the volume adjusting group comprises a piston element coupled to the driving group and a slider connected to the piston element, wherein the slider is disposed on one side of the screw compression group, and the piston element is used to drive the slider to slide toward the intake end or toward the discharge end.

18. The compressor according to claim 17, wherein the driving group comprises a first oil circuit and a second oil circuit coupled to the piston element, wherein when the control module connects the first oil circuit and disconnects the second oil circuit, the piston element slides toward the intake end, and when the control module connects the second oil circuit and disconnects the first oil circuit, the piston element slides toward the discharge end.

19. The compressor according to claim 10, wherein the volume adjusting group comprises a screw coupled to the driving group and a slider coupled to the screw, wherein the slider is disposed on one side of the screw compression group, and the screw is used to drive the slider to slide toward the intake end or toward the discharge end.

20. The compressor according to claim 19, wherein the driving group comprises a motor, and the screw is coupled to the motor, wherein when the control module controls the motor to drive the screw to rotate in a first rotational direction, the screw drives the slider to slide toward the intake end, and when the control module controls the motor to drive the screw to rotate in a second rotational direction reverse to the first rotational direction, the screw drives the slider to slide toward the discharge end.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a cross-sectional schematic diagram of a compressor according to an embodiment of the disclosure.

[0010] FIG. 2 is a schematic diagram of the process flow of a controlling method of a volume ratio of the compressor according to an embodiment of the disclosure.

[0011] FIG. 3 is a cross-sectional schematic diagram of a compressor according to another embodiment of the disclosure.

[0012] FIG. 4 is a schematic diagram of the process flow of a controlling method of a volume ratio of the compressor according to another embodiment of the disclosure.

DESCRIPTION OF THE EMBODIMENTS

[0013] FIG. 1 is a cross-sectional schematic diagram of a compressor according to an embodiment of the disclosure. Referring to FIG. 1, in this embodiment, a compressor 100 may be a screw compressor with a variable volume ratio and includes a body 110, a screw compression group 120, a volume adjusting group 130, a driving group 140, and a control module 200. Specifically, the body 110 has an intake end 111 and a discharge end 112, wherein the screw compression group 120 is disposed in a compression chamber 113 of the body 110 and located between the intake end 111 and the discharge end 112. The screw compression group 120 compresses a fluid introduced into the compression chamber 113 from the intake end 111. The compressed fluid is then discharged from the compression chamber 113 and finally expelled through the discharge end 112.

[0014] The volume adjusting group 130 is disposed in the body 110 corresponding to the screw compression group 120. The volume adjusting group 130 may include a piston element 131 and a slider 132 connected to the piston element 131. The piston element 131 is disposed in a piston chamber of the body 110 and is configured to slide reciprocally within the piston chamber. On the other hand, the slider 132 is disposed on one side of the screw compression group 120 and is configured to slide synchronously with the piston element 131. When the piston element 131 drives the slider 132 to slide toward the intake end 111 or the discharge end 112, the position of a radial exhaust port of the slider 132 changes, thereby adjusting the volume ratio.

[0015] Furthermore, when the piston element 131 drives the slider 132 to slide toward the intake end 111, the distance between the radial exhaust port of the slider 132 and the intake end 111 is reduced. This shortens the stroke of the screw compression group 120 compressing the fluid, resulting in a decrease in discharge pressure and volume ratio. Conversely, when the piston element 131 drives the slider 132 to slide toward the discharge end 112, the distance between the radial exhaust port of the slider 132 and the intake end 111 is increased. This lengthens the stroke of the screw compression group 120 compressing the fluid, resulting in an increase in discharge pressure and volume ratio.

[0016] As shown in FIG. 1, the driving group 140 is coupled to the volume adjusting group 130 and is used to drive the volume adjusting group 130 to adjust the volume ratio. On the other hand, the control module 200 is electrically connected to the driving group 140 and is used to control the driving group 140 to drive the volume adjusting group 130 to adjust the volume ratio. In this embodiment, the driving group 140 includes a first oil circuit 141 and a second oil circuit 142 coupled to the piston element 131. Both the first oil circuit 141 and the second oil circuit 142 are connected to the piston chamber in which the piston element 131 is located, and are used respectively for injecting or discharging oil to or from the piston element 131.

[0017] When the control module 200 opens the first oil circuit 141 and closes the second oil circuit 142, the first oil circuit 141 performs an oil injection operation on the piston element 131, pushing the piston element 131 toward the intake end 111. Conversely, when the control module 200 opens the second oil circuit 142 and closes the first oil circuit 141, the second oil circuit 142 performs an oil discharge operation on the piston element 131, pulling the piston element 131 toward the discharge end 112.

[0018] Furthermore, the first oil circuit 141 includes a first control valve 141a and a first pipeline 141b, wherein the first control valve 141a is disposed on the first pipeline 141b and is used to open or block the first pipeline 141b. On the other hand, the second oil circuit 142 includes a second control valve 142a and a second pipeline 142b, wherein the second control valve 142a is disposed on the second pipeline 142b and is used to open or block the second pipeline 142b.

[0019] As shown in FIG. 1, the control module 200 is electrically connected to the first control valve 141a and the second control valve 142a to control the opening or closing of the first control valve 141a and the opening or closing of the second control valve 142a. On the other hand, both the first pipeline 141b and the second pipeline 142b are connected to the piston chamber where the piston element 131 is located.

[0020] When the first control valve 141a is opened, the first pipeline 141b is opened, allowing fluid to flow into the piston chamber via the first pipeline 141b to perform an oil injection operation on the piston element 131. Conversely, when the first control valve 141a is closed, the first pipeline 141b is blocked, and fluid cannot flow into the piston chamber via the first pipeline 141b. On the other hand, when the second control valve 142a is opened, the second pipeline 142b is opened, allowing fluid to flow out of the piston chamber via the second pipeline 142b to perform an oil discharge operation on the piston element 131. Conversely, when the second control valve 142a is closed, the second pipeline 142b is blocked, and fluid cannot flow out of the piston chamber via the second pipeline 142b.

[0021] In this embodiment, the control module 200 may include a processor, a storage circuit, and a sensing circuit, wherein the storage circuit and the sensing circuit are electrically coupled to the processor. Specifically, the processor is used to control the overall or partial operation of the compressor 100 and may include, but is not limited to, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors, digital signal processors (DSP), programmable controllers, application specific integrated circuits (ASIC), programmable logic devices (PLD), or other similar devices or combinations thereof.

[0022] The storage circuit is used to store data and may include, but is not limited to, volatile storage circuits and non-volatile storage circuits. The volatile storage circuit is used to store data in a volatile manner and may include random access memory (RAM) or similar volatile storage media. The non-volatile storage circuit is used to store data in a non-volatile manner and may include read only memory (ROM), solid-state disks (SSD), and/or traditional hard disk drives (HDD) or similar non-volatile storage media. Additionally, the sensing circuit is used to detect the overall or partial operational status of the compressor 100, and the processor may store the overall or partial operational status of the compressor 100, detected by the sensing circuit, in the storage circuit.

[0023] FIG. 2 is a schematic diagram of the process flow of a controlling method of a volume ratio of a compressor according to an embodiment of the disclosure. Referring to FIG. 1 and FIG. 2, the controlling method of the volume ratio of the compressor 100 is described as follows. In steps S10 to S30, when the compressor 100 starts operating, the control module 200 receives an initiation command and sets the adjustment flag to a preset flag value. On the other hand, the control module 200 detects the operational status of the compressor 100 either immediately upon startup or after a delay of a few seconds, and records this as the previous evaluation indicator. For example, the previous evaluation indicator may include current, power, or performance.

[0024] Next, in steps S40 and S50, after recording the previous evaluation indicator and waiting for a preset time (which may, for example, but not limited to, be any value between 10 and 60 seconds), the control module 200 detects the current operational status of the compressor 100 and records this as the current evaluation indicator. For example, the current evaluation indicator may include current, power, or performance. It should be noted that the previous evaluation indicator and the current evaluation indicator correspond to the operational statuses of the compressor 100 at preceding and following time sequences, respectively.

[0025] Next, in step S60, the control module 200 compares the previous evaluation indicator with the current evaluation indicator and determines whether the current evaluation indicator conforms to a preset condition as compared to the previous evaluation indicator. For example, the preset condition may be that the current evaluation indicator is superior to or equal to the previous evaluation indicator, or in other words, that the current evaluation indicator is not inferior to the previous evaluation indicator. On the other hand, the current evaluation indicator being superior to or equal to the previous evaluation indicator may include a current operating current being lower than or equal to a previous operating current, a current consumed power being lower than or equal to a previous consumed power, or a current performance being superior to or equal to a previous performance.

[0026] In steps S60 to S80, if the current evaluation indicator is determined to conform to the preset condition as compared to the previous evaluation indicator, the adjustment flag is maintained as the preset flag value. Conversely, if the current evaluation indicator is determined not to conform to the preset condition as compared to the previous evaluation indicator, the adjustment flag is set to a reverse flag value. Then, regardless of whether the adjustment flag has been switched, a determination is made as to whether the adjustment flag is the preset flag value.

[0027] If the adjustment flag remains as the preset flag value, step S71 is performed, adjusting in the same direction as the preset flag value. Conversely, if the adjustment flag is not the preset flag value, step S81 is performed, adjusting in the reverse direction to the preset flag value. In one example, adjusting in the same direction as the preset flag value may involve controlling the driving group 140 to drive the volume adjusting group 130 to increase the volume ratio, which means moving toward the discharge end 112. Conversely, adjusting in the reverse direction to the preset flag value may involve controlling the driving group 140 to drive the volume adjusting group 130 to decrease the volume ratio, which means moving toward the intake end 111. In another example, adjusting in the same direction as the preset flag value may involve controlling the driving group 140 to drive the volume adjusting group 130 to decrease the volume ratio, which means moving toward the intake end 111. Conversely, adjusting in the reverse direction to the preset flag value may involve controlling the driving group 140 to drive the volume adjusting group 130 to increase the volume ratio, which means moving toward the discharge end 112.

[0028] In an example, within the determination and control cycle for adjusting the volume ratio, switching the adjustment flag to the reverse flag value may be configured as follows: during a cycle of continuously increasing the volume ratio, if the current evaluation indicator is determined not to conform to the preset condition as compared to the previous evaluation indicator, the operation of increasing the volume ratio is stopped, and the operation of decreasing the volume ratio is performed instead. At this time, the adjustment flag is switched, for example, set to the reverse flag value instead of the preset flag value. Conversely, during a cycle of continuously decreasing the volume ratio, if the current evaluation indicator is determined not to conform to the preset condition as compared to the previous evaluation indicator, the operation of decreasing the volume ratio is stopped, and the operation of increasing the volume ratio is performed instead. At this time, the adjustment flag is switched, for example, reverted to the preset flag value.

[0029] In another example, within the determination and control cycle for adjusting the volume ratio, switching the adjustment flag to the reverse flag value may be configured as follows: during a cycle of continuously decreasing the volume ratio, if the current evaluation indicator is determined not to conform to the preset condition as compared to the previous evaluation indicator, the operation of decreasing the volume ratio is stopped, and the operation of increasing the volume ratio is performed instead. At this time, the adjustment flag is switched, for example, set to the reverse flag value instead of the preset flag value. Conversely, during a cycle of continuously increasing the volume ratio, if the current evaluation indicator is determined not to conform to the preset condition as compared to the previous evaluation indicator, the operation of increasing the volume ratio is stopped, and the operation of decreasing the volume ratio is performed instead. At this time, the adjustment flag is switched, for example, reverted to the preset flag value.

[0030] In other words, the control module 200 can control the direction of increase or decrease of the volume ratio based on the switching of the flag value. If increasing the volume ratio is considered as an operation in the same direction, then decreasing the volume ratio is considered as an operation in the reverse direction. Conversely, if decreasing the volume ratio is considered as an operation in the same direction, then increasing the volume ratio is considered as an operation in the reverse direction.

[0031] In one example, the preset flag value may be set to 1. During a cycle of continuously increasing the volume ratio, the adjustment flag remains unchanged. If the determination result of the current evaluation indicator compared to the previous evaluation indicator does not conform to the preset condition, the adjustment flag is switched. For instance, the adjustment flag may be set to 0, and this step is regarded as setting the adjustment flag to the reverse flag value.

[0032] Further to the above, when the adjustment flag is set to 0, an operation to decrease the volume ratio is performed. If the determination result of the current evaluation indicator compared to the previous evaluation indicator conforms to the preset condition, the adjustment flag remains unchanged, and the operation to decrease the volume ratio continues. Conversely, if the determination result of the current evaluation indicator compared to the previous evaluation indicator does not conform to the preset condition, the adjustment flag is switched. For instance, the adjustment flag may be set to 1 (i.e., reverted to the preset flag value), and this step is regarded as setting the adjustment flag to the reverse flag value.

[0033] In another example, the preset flag value may be set to 1. During a cycle of continuously decreasing the volume ratio, the adjustment flag remains unchanged. If the determination result of the current evaluation indicator compared to the previous evaluation indicator does not conform to the preset condition, the adjustment flag is switched. For instance, the adjustment flag may be set to 0, and this step is regarded as setting the adjustment flag to the reverse flag value.

[0034] Further to the above, when the adjustment flag is set to 0, an operation to increase the volume ratio is performed. If the determination result of the current evaluation indicator compared to the previous evaluation indicator conforms to the preset condition, the adjustment flag remains unchanged, and the operation to increase the volume ratio continues. Conversely, if the determination result of the current evaluation indicator compared to the previous evaluation indicator does not conform to the preset condition, the adjustment flag is switched. For instance, the adjustment flag may be set to 1 (i.e., reverted to the preset flag value), and this step is regarded as setting the adjustment flag to the reverse flag value.

[0035] In other words, if the current adjustment flag is set to 1, then in the step of setting the adjustment flag to the reverse flag value, the adjustment flag is changed to 0. Conversely, if the current adjustment flag is set to 0, then in the step of setting the adjustment flag to the reverse flag value, the adjustment flag is changed to 1. It is worth mentioning that in practical applications, based on the operational requirements of different compressors, the operation of increasing or decreasing the volume ratio may be set as the preset flag value 1. Therefore, for compressors with different configuration requirements, the direction of the adjustment flag when the preset flag value is 1 may vary.

[0036] Then, in step S90, the previous evaluation indicator is updated, and the determination and adjustment steps, including steps S40, S50, S60, S70, S80, S71, and S81, are repeatedly executed. Specifically, updating the previous evaluation indicator involves the control module 200 replacing the previous evaluation indicator with the current evaluation indicator, which serves as the comparison benchmark for the next determination and adjustment steps. Additionally, once the compressor 100 is shut down, the control module 200 receives a shutdown command and stops all actions such as detection, recording, determination, adjustment, and control.

[0037] The controlling method of the volume ratio of the compressor 100 described above enables the continuous determination of the direction of increase or decrease of the volume ratio during the operation of the compressor 100 by comparing evaluation indicators of preceding and following time sequences, such as operating current, consumed power, or performance. The adjustment of the volume ratio is controlled so that the adjusted volume ratio conforms to or approximates the optimal value under real-time operating conditions. Furthermore, during the control process of the disclosure, the real-time operating conditions can be immediately reflected. The control module can control the volume adjusting group to quickly approach the optimal value for the real-time operating conditions, allowing the performance of the compressor to match the best operating conditions. Simultaneously, the number of detection devices and the number of signals processed by the control module can be reduced, achieving the goals of simplifying control logic and improving control sensitivity. This significantly mitigates the issue of excessive energy consumption of the compressor 100 and greatly enhances its performance.

[0038] FIG. 3 is a cross-sectional schematic diagram of another embodiment of the compressor according to the disclosure. Referring to FIG. 3, a compressor 100A in this embodiment can also execute the controlling method of the volume ratio of the compressor 100 in the previous embodiment. The compressor 100A in this embodiment is generally similar to the compressor 100 in the previous embodiment, with the main difference lying in the design of the driving group and the volume adjusting group.

[0039] Specifically, in this embodiment, a volume adjusting group 130a may include a screw 131a and a slider 132a coupled to the screw 131a. The rotation of the screw 131a can drive the slider 132a to slide toward the intake end 111 or the discharge end 112, thereby changing the position of the radial exhaust port of the slider 132 and achieving the purpose of adjusting the volume ratio.

[0040] On the other hand, the driving group includes a motor 140a, which can be a servo motor or a stepper motor. The screw 131a is coupled to the output shaft of the motor 140a, allowing the screw 131a to rotate synchronously in the same direction as the output shaft of the motor 140a. When the control module 200 controls the motor 140a to drive the screw 131a to rotate in a first rotational direction R1, the screw 131a drives the slider 132a to slide toward the intake end 111. This shortens the distance between the radial exhaust port of the slider 132 and the intake end 111, reduces the stroke of the screw compression group 120 compressing the fluid, and lowers the discharge pressure and volume ratio. Conversely, when the control module 200 controls the motor 140a to drive the screw 131a to rotate in a second rotational direction R2 opposite to the first rotational direction R1, the screw 131a drives the slider 132a to slide toward the discharge end 112. This increases the distance between the radial exhaust port of the slider 132 and the intake end 111, lengthens the stroke of the screw compression group 120 compressing the fluid, and increases the discharge pressure and volume ratio.

[0041] FIG. 4 is a schematic diagram of the process flow of a controlling method of a volume ratio of a compressor according to another embodiment of the disclosure. Referring to FIG. 4, the volume ratio controlling method in this embodiment can be implemented in the compressor 100 shown in FIG. 1 or the compressor shown in FIG. 3. The volume ratio controlling method in this embodiment is generally similar to the method in the previous embodiment, with the main difference lying in the accumulation and determination of the same-direction adjustment count (i.e., the count of continuously increasing or continuously decreasing the volume ratio).

[0042] In this embodiment, when the adjustment flag is preset to the preset flag value, if the determination result of the evaluation indicators in preceding and following time sequences in each cycle (i.e., the determination result of the current evaluation indicator compared to the previous evaluation indicator) conforms to the preset condition, the same-direction adjustment count is updated by adding one to the count. The current flag value is maintained to perform an adjustment operation in the same direction as the preset flag value, as shown in steps S60, S61, S62, S70, and S71.

[0043] Furthermore, in step S61, although the determination result of the evaluation indicators in preceding and following time sequences in each cycle conforms to the preset condition, it is necessary to determine whether the accumulated same-direction adjustment count is less than a preset count. If the accumulated same-direction adjustment count is less than the preset count, the same-direction adjustment count is updated (as in step S62), and the current flag value is maintained to perform the same-direction adjustment operation (as in steps S70 and S71).

[0044] Conversely, as shown in steps S61 and S80, if the accumulated same-direction adjustment count is equal to or greater than the preset count, the adjustment flag is forcibly set to the reverse flag value, and the same-direction adjustment count is reset to zero. On the other hand, as shown in steps S60 and S80, if the determination result of the evaluation indicators in preceding and following time sequences in any cycle does not conform to the preset condition, the adjustment flag is forcibly set to the reverse flag value, and the same-direction adjustment count is reset to zero. In practical applications, the preset count can be set to any value between 5 and 30 based on the model specifications of different compressors, but it is not limited to this range.

[0045] As shown in steps S80, S70, and S81, after the adjustment flag is set to the reverse flag value, an adjustment operation in the reverse direction to the preset flag value is performed. Subsequently, as shown in steps S90, S40, S50, and S60, the determination of the evaluation indicators in preceding and following time sequences for the next cycle is performed. If the determination result of the evaluation indicators in preceding and following time sequences in each cycle conforms to the preset condition, the same-direction adjustment count is updated by adding one to the count. The current flag value is maintained to perform the same-direction adjustment operation, such as continuously performing an adjustment operation in the reverse direction to the preset flag value, as shown in steps S60, S61, S62, S70, and S81.

[0046] Furthermore, in step S61, although the determination result of the evaluation indicators in preceding and following time sequences in each cycle conforms to the preset condition, it is necessary to determine whether the accumulated same-direction adjustment count is less than the preset count. If the accumulated same-direction adjustment count is less than the preset count, the same-direction adjustment count is updated (as in step S62), and the current flag value is maintained to perform the same-direction adjustment operation (as in steps S70 and S81).

[0047] Conversely, as shown in steps S61 and S80, if the accumulated same-direction adjustment count is equal to or greater than the preset count, the adjustment flag is forcibly set to the reverse flag value (i.e., reverted to the preset flag value), and the same-direction adjustment count is reset to zero. On the other hand, as shown in steps S60 and S80, if the determination result of the evaluation indicators in preceding and following time sequences in any cycle (i.e., the determination result of the current evaluation indicator compared to the previous evaluation indicator) does not conform to the preset condition, the adjustment flag is forcibly set to the reverse flag value (i.e., reverted to the preset flag value), and the same-direction adjustment count is reset to zero. As shown in steps S80, S70, and S71, after the adjustment flag is reverted to the preset flag value, an adjustment operation in the same direction as the preset flag value is performed.

[0048] Through the above determination and control cycle for adjusting the volume ratio, the optimal range of the volume ratio can be continuously narrowed, approaching the optimal volume ratio under real-time operating conditions. Additionally, it prevents the volume ratio from increasing or decreasing without limit, thereby avoiding exceeding the hardware device's limit settings.

[0049] On the other hand, as shown in steps S10 and S21, if the compressor 100 is restarted after being shut down, the control module 200 will first perform an initialization operation, such as setting the adjustment flag to the preset flag value and resetting the same-direction adjustment count to zero.

[0050] The compressor and the control method provided in the disclosure are not only applicable to the volume ratio control of fixed-frequency compressors but also to variable-frequency compressors. Furthermore, when the frequency of a variable-frequency compressor stabilizes after a period of change, the control method of the disclosure can execute volume ratio control during the stable frequency state of the variable-frequency compressor. Regardless of how the frequency of the variable-frequency compressor changes, the control process of the disclosure can immediately reflect the real-time operating conditions. The control module can control the volume adjusting group to quickly approach the optimal value for the real-time operating conditions, ensuring that the compressor's performance meets the optimal operating conditions.

[0051] In summary, the compressor and the controlling method of a volume ratio thereof provided in the disclosure can continuously determine the direction of increase or decrease of the volume ratio during the operation of the compressor by comparing evaluation indicators of preceding and following time sequences, such as operating current, consumed power, or performance. The adjustment of the volume ratio is controlled such that the adjusted volume ratio conforms to or approximates the optimal value under real-time operating conditions. Furthermore, during the control process of the disclosure, the real-time operating conditions can be immediately reflected. The control module can control the volume adjusting group to quickly approach the optimal value for the real-time operating conditions, ensuring that the compressor's performance meets the optimal operating conditions. At the same time, the number of detection devices and the number of signals processed by the control module can be reduced, achieving the objectives of simplifying control logic and improving control sensitivity. This significantly mitigates the issue of excessive energy consumption of the compressor and greatly enhances its performance.

[0052] Although the disclosure has been described with reference to the above embodiments, they are not intended to limit the disclosure. It will be apparent to one of ordinary skill in the art that modifications to the described embodiments may be made without departing from the spirit and the scope of the disclosure. Accordingly, the scope of the disclosure will be defined by the attached claims and their equivalents and not by the above detailed descriptions.