METHOD AND SYSTEM FOR AUTOMATIC CONTROL OF A VACUUM PUMP

20250238045 · 2025-07-24

Assignee

Jiangsu Jingchuang Electronics Co., Ltd (Xuzhou, CN)

Inventors

Cpc classification

International classification

Abstract

The present disclosure relates to a method and system for automatic control of a vacuum pump. The method involves: starting the vacuum pump and obtaining system parameters; starting the motor and opening the solenoid valve; collecting the current vacuum value and motor start time; establishing a vacuum value model; comparing the current and predicted vacuum values; establishing a time parameter model; comparing the current vacuum value and time with set values; and turning off the motor and solenoid valve. This system enables remote and automatic control through solenoid valves and control circuits, saving energy, reducing labor costs, and improving efficiency.

Claims

1. A method for automatic control of a vacuum pump, comprising: S1: Starting the vacuum pump and obtaining system parameters of the vacuum pump; S2: Starting the motor and opening the solenoid valve; S3: Collecting the current vacuum value D.sub.1 of the vacuum pump and the start time t.sub.1 of the motor; S4: Establishing a vacuum value model: $D_{X} = 1 0 + \frac{0.8 5}{(t_{x} - t_{1}) (\frac{J_{0} (t_{x} + J_{2})}{t_{x} + J_{1}})}$ Where D.sub.X is the predicted vacuum value, t.sub.x is the current time, J.sub.0, J.sub.1, J.sub.2 are constant parameters of the vacuum value model, with initial values of J.sub.0=1, J.sub.1=3000, J.sub.2=4; S5: Determining the relationship between the current vacuum value D.sub.1 of the vacuum pump and the predicted vacuum value D.sub.X, if D.sub.XD.sub.1, then modifying J.sub.0, J.sub.1, J.sub.2, and returning to step S4; if D.sub.X=D.sub.1, then proceeding to the next step; S6: Establishing a time parameter model: $F_{(X)} = t_{2}^{2} + t_{2} (J_{2} - t_{1} - A) - (t_{1} J_{2} - A J_{1})$ Where A is a constant, $A = \frac{0.8 5}{(D - 1 0) J_{0}},$ D is the preset vacuum value, t.sub.2 is the predicted time; Calculating t.sub.2; S7: Determining the relationship between the preset vacuum value D and the current vacuum value D.sub.1 at the current moment, if D.sub.1>D, then entering the next moment and repeating this step, if D.sub.1=D, then proceeding to the next step, if D.sub.1<D, then proceeding to step S9; S8: Determining the relationship between the current time t.sub.x and the predicted time t.sub.2, if t.sub.x<t.sub.2, then entering the next moment and repeating this step, if t.sub.x=t.sub.2, then closing the solenoid valve, entering the next moment and repeating this step, if t.sub.x>t.sub.2, then proceeding to the next step; S9: Turning off the motor and closing the solenoid valve.

2. The method for automatic control of a vacuum pump according to claim 1, wherein in step S5, if D.sub.X>D.sub.1, then decreasing J.sub.0, J.sub.1, increasing J.sub.2, and returning to step S4; if D.sub.X<D.sub.1, then increasing J.sub.0, J.sub.1, decreasing J.sub.2, and returning to step S4.

3. The method for automatic control of a vacuum pump according to claim 2, wherein the constant parameters J.sub.0, J.sub.1, J.sub.2 of the vacuum value model are adjusted arithmetically, the arithmetic difference of J.sub.0 is J.sub.0, the arithmetic difference of J.sub.1 is J.sub.1, and the arithmetic difference of J.sub.2 is J.sub.2.

4. The method for automatic control of a vacuum pump according to claim 1, wherein steps SB and SC are provided simultaneously with steps S3-S8; Step SB: Obtaining the motor temperature T.sub.1 and oil temperature T.sub.2 of the vacuum pump; Step SC: Determining the relationship between the motor temperature T.sub.1 and the set protection temperature T.sub.0, and the relationship between the oil temperature T.sub.2 and the set protection temperature T.sub.0, if T.sub.0T.sub.110 and T.sub.0T.sub.210, then returning to step SB, if not, then alarming and returning to step SB.

5. The method for automatic control of a vacuum pump according to claim 4, wherein in step SC, if T.sub.0T.sub.1<0 or T.sub.0T.sub.2<0, then proceeding to step S9.

6. The method for automatic control of a vacuum pump according to claim 1, wherein step SD is provided simultaneously with steps S7-S8; Step SD: Determining the relationship between the current vacuum value D.sub.1 and the predicted vacuum value D.sub.X, if D.sub.1>D.sub.X, then alarming, entering the next moment and repeating this step, if D.sub.1=D.sub.X, then entering the next moment and repeating this step, if D.sub.1<D.sub.X, then decreasing the predicted time t.sub.2, entering the next moment and repeating this step.

7. The method for automatic control of a vacuum pump according to claim 1, wherein step SE is provided after step S9; Step S9: Determining whether the current vacuum value D.sub.1 is greater than the preset vacuum value D, if not, then entering the next moment and repeating this step; if yes, then opening the solenoid valve and turning on the motor, and returning to step S7.

8. A control system based on the method for automatic control of a vacuum pump according to claim 1, comprising a vacuum pump assembly, a control circuit and a display control screen, wherein the vacuum pump assembly includes a vacuum pump, a motor, a solenoid valve and a vacuum sensor, the motor is connected to the control circuit; one end of the solenoid valve is connected to the vacuum pump, and the other end is connected to the control circuit; one end of the vacuum sensor is connected to the inlet of the vacuum pump, and the other end is connected to the control circuit; the display control screen is connected to the control circuit.

9. The control system according to claim 8, wherein the vacuum pump assembly further includes a first temperature sensor and a second temperature sensor, both the first temperature sensor and the second temperature sensor are connected to the control circuit, the first temperature sensor is used to detect the motor temperature T.sub.1 of the vacuum pump, and the second temperature sensor is used to detect the oil temperature T.sub.2 of the vacuum pump.

10. The control system according to claim 9, wherein the control circuit includes a main control circuit, a power supply circuit for power supply, a clock circuit, a sensor signal processing circuit connected to the vacuum sensor, a solenoid valve control circuit connected to the solenoid valve, a display control circuit connected to the display control screen, a motor drive circuit connected to the motor, a temperature acquisition circuit connected to the first temperature sensor and the second temperature sensor, and a Bluetooth circuit for remote data transmission, all circuits are connected to the main control circuit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 is a flow chart of the vacuum pump automatic control of the present disclosure;

[0036] FIG. 2 is a flow chart of the vacuum pump temperature determination of the present disclosure;

[0037] FIG. 3 is a flow chart of the leak tightness determination of the present disclosure;

[0038] FIG. 4 is a flow chart of the automatic start of the vacuum pump of the present disclosure;

[0039] FIG. 5 is a structural diagram of the control circuit of the present disclosure.

DETAILED DESCRIPTION

[0040] The following description, in conjunction with the accompanying drawings, will clearly and completely describe the technical solutions of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present disclosure.

[0041] In the description of the present disclosure, it should be noted that terms such as center, up, down, left, right, vertical, horizontal, inner, and outer indicate orientations or positional relationships. These terms are based on those shown in the drawings. These terms are used only for convenience and simplification. They do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, or operate in a specific orientation. Therefore, they should not be understood as limitations on the present disclosure. Additionally, terms first, second, third are used only for descriptive purposes and should not be understood as indicating or implying relative importance.

[0042] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, terms installed, connected, coupled should be understood broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meanings of these terms in the present disclosure based on specific situations. Moreover, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict.

[0043] The present disclosure provides a method and system for automatic control of a vacuum pump. It can realize remote and automatic control of the vacuum pump through solenoid valves and control circuits. This achieves separate and linked control of the motor and solenoid valve. By controlling the opening and closing of the solenoid valve, it maintains the vacuum level. Coupled with vacuum sensor and control circuits, it automatically closes the solenoid valve and vacuum pump after work completion, saving energy and electricity, reducing labor costs, and improving work efficiency.

[0044] Referring to FIG. 1, the method for automatic control of a vacuum pump includes: [0045] S1: Starting the vacuum pump and obtaining system parameters of the vacuum pump; system parameters include the preset vacuum value D. [0046] S2: Starting the motor and opening the solenoid valve. [0047] S3: Collecting the current vacuum value D.sub.1 of the vacuum pump and the start time t.sub.1 of the motor. [0048] S4: Establishing a vacuum value model:

[00004] $D_{X} = 1 0 + \frac{0.8 5}{(t_{x} - t_{1}) (\frac{J_{0} (t_{x} + J_{2})}{t_{x} + J_{1}})}$ [0049] Where D.sub.X is the predicted vacuum value, t.sub.x is the current time, J.sub.0, J.sub.1, J.sub.2 are constant parameters of the vacuum value model, with initial values of J.sub.0=1, J.sub.1=3000, J.sub.2=4. [0050] S5: Determining the relationship between the current vacuum value D.sub.1 of the vacuum pump and the predicted vacuum value D.sub.X, if D.sub.X+D.sub.1, then modifying J.sub.0, J.sub.1, J.sub.2, and returning to step S4; if D.sub.X=D.sub.1, then proceeding to the next step.

[0051] Preferably, if D.sub.X>D.sub.1, then decreasing J.sub.0, J.sub.1, increasing J.sub.2; if D.sub.X<D.sub.1, then increasing J.sub.0, J.sub.1, decreasing J.sub.2. There are two ways to adjust the constant parameters J.sub.0, J.sub.1, J.sub.2 of the vacuum value model: [0052] Method 1: Based on experimental experience, the system reasonably adjusts the constant parameters J.sub.0, J.sub.1, J.sub.2 of the vacuum value model, i.e., the adjustment values of J.sub.0, J.sub.1, J.sub.2 are not equal each time. [0053] Method 2: The constant parameters J.sub.0, J.sub.1, J.sub.2 of the vacuum value model are adjusted arithmetically, i.e., for each adjustment of J.sub.0, J.sub.1, and J.sub.2, the difference between the values before and after the adjustment is equal, the arithmetic difference of J.sub.0 is J.sub.0, the arithmetic difference of J.sub.1 is J.sub.1, and the arithmetic difference of J.sub.2 is J.sub.2. [0054] S6: Establishing a time parameter model:

[00005] $F_{(X)} = t_{2}^{2} + t_{2} (J_{2} - t_{1} - A) - (t_{1} J_{2} - A J_{1})$ [0055] where A is a constant,

[00006] $A = \frac{0.8 5}{(D - 1 0) J_{0}},$

D is the preset vacuum value, t.sub.2 is the predicted time.

[0056] Let: a=1, b=J.sub.2t.sub.1A, c=t.sub.1J.sub.2J.sub.1, then:

[00007] $F_{(X)} = a t_{2}^{2} + b t_{2} - c$

[0057] Therefore:

[00008] $t_{2} = \frac{- b \sqrt{b^{2} + 4 ac}}{2 a}$

[0058] Calculate t.sub.2; [0059] S7: Determining the relationship between the current vacuum value D.sub.1 at the current moment and the preset vacuum value D, if D.sub.1>D, then entering the next moment and repeating this step, if D.sub.1=D, then proceeding to the next step, if D.sub.1<D, then proceeding to step S9. [0060] S8: Determining the relationship between the current time t.sub.x and the predicted time t.sub.2, if t.sub.x<t.sub.2, then entering the next moment and repeating this step, if t.sub.x=t.sub.2, then closing the solenoid valve, entering the next moment and repeating this step, if t.sub.x>t.sub.2, then proceeding to the next step. [0061] S9: Turning off the motor and closing the solenoid valve.

[0062] As an embodiment of the present disclosure, real-time monitoring of the temperature and leak tightness of the vacuum pump are added during the operation of the vacuum pump. When temperature or leak tightness abnormalities occur, the solenoid valve or motor is promptly shut off to avoid damage to the vacuum pump and effectively improve the operational safety of the vacuum pump. The method for automatic control of a vacuum pump includes: [0063] S1: Starting the vacuum pump and obtaining system parameters of the vacuum pump; system parameters include the preset vacuum value D and the set protection temperature T.sub.0. [0064] S2: Starting the motor and opening the solenoid valve.

[0065] Referring to FIG. 2, steps SB and SC are provided simultaneously with steps S3-S8 to detect and judge the temperature of the vacuum pump; [0066] Step SB: Obtaining the motor temperature T.sub.1 and oil temperature T.sub.2 of the vacuum pump. [0067] Step SC: Determining the relationship between the motor temperature T.sub.1 and the set protection temperature T.sub.0, and the relationship between the oil temperature T.sub.2 and the set protection temperature T.sub.0, if T.sub.0T10 and T.sub.0T.sub.210, then returning to step SB, if not, then alarming and returning to step SB.

[0068] Preferably, when T.sub.0T.sub.1<10 or T.sub.0T.sub.2<10, determine if T.sub.0T.sub.1<0 or T.sub.0T.sub.2<0, if yes, then proceed to step S9, if no, then alarm and return to step SB. [0069] S3: Collecting the current vacuum value D.sub.1 of the vacuum pump and the start time t.sub.1 of the motor. [0070] S4: Establishing a vacuum value model:

[00009] $D_{X} = 1 0 + \frac{0.8 5}{(t_{x} - t_{1}) (\frac{J_{0} (t_{x} + J_{2})}{t_{x} + J_{1}})}$ [0071] S5: Determining the relationship between the current vacuum value D.sub.1 of the vacuum pump and the predicted vacuum value D.sub.X, if D.sub.X+D.sub.1, then modifying J.sub.0, J.sub.1, J.sub.2, and returning to step S4; if D.sub.X=D.sub.1, then proceeding to the next step. [0072] S6: Establishing a time parameter model:

[00010] $F_{(X)} = t_{2}^{2} + t_{2} (J_{2} - t_{1} - A) - (t_{1} J_{2} - A J_{1})$

[0073] Referring to FIG. 3, step SD is provided simultaneously with steps S7-S8 to judge the leak tightness of the vacuum pump. [0074] Step SD: Determining the relationship between the current vacuum value D.sub.1 and the predicted vacuum value D.sub.X. If D.sub.1>D.sub.X, then alarming, entering the next moment and repeating this step. If D.sub.1=D.sub.X, then entering the next moment and repeating this step. If D.sub.1<D.sub.X, then decreasing the predicted time t.sub.2, entering the next moment and repeating this step. Through step SD, the motor operating time can be effectively reduced, allowing for the motor and solenoid valve to be shut off earlier. [0075] S7: Determining the relationship between the current vacuum value D.sub.1 at the current moment and the preset vacuum value D, if D.sub.1>D, then entering the next moment and repeating this step, if D.sub.1=D, then proceeding to the next step, if D.sub.1<D, then proceeding to step S9. [0076] S8: Determining the relationship between the current time t.sub.x and the predicted time t.sub.2, if t.sub.x<t.sub.2, then entering the next moment and repeating this step, if t.sub.x=t.sub.2, then closing the solenoid valve, entering the next moment and repeating this step, if t.sub.x>t.sub.2, then proceeding to the next step. [0077] S9: Turning off the motor and closing the solenoid valve.

[0078] Referring to FIG. 4, as an embodiment of the present disclosure, after step S9, i.e., after turning off the motor and closing the solenoid valve, the system performs a vacuum maintenance task. Since the vacuum system cannot achieve 100% sealing, once vacuum pumping stops, the vacuum value will rise at a certain rate over time. Therefore, the system continues to determine the relationship between the current vacuum value D.sub.1 at the current moment and the preset vacuum value D. Step SE is provided after step S9. [0079] Step SE: Determining whether the current vacuum value D.sub.1 is greater than the preset vacuum value D, if not, then entering the next moment and repeating this step; if yes, then opening the solenoid valve and turning on the motor, and returning to step S7. Through step SE, the system can automatically switch between the vacuum pumping task and the vacuum maintenance task, keeping the system's vacuum value within the set desired range.

[0080] Referring to FIG. 5, the present disclosure provides a control system, comprising a vacuum pump assembly, a control circuit and a display control screen. The vacuum pump assembly includes a vacuum pump, a motor, a solenoid valve and a vacuum sensor. The motor is connected to the control circuit; one end of the solenoid valve is connected to the vacuum pump, and the other end is connected to the control circuit. The solenoid valve uses electromagnetic principles to achieve vacuum processing of the pipeline and electromagnetic control. Moreover, using a vacuum solenoid valve can effectively avoid the influence of other irrelevant factors on the pipeline, thus making correct adjustments to the working state of the system.

[0081] One end of the vacuum sensor is connected to the inlet of the vacuum pump, and the other end is connected to the control circuit. Detects the content of gas molecules in the air, when there are more gas molecules, the thermal conductivity of the gas is high, and the vacuum value is large; when there are few molecules, the thermal conductivity of the gas is low, and the vacuum value is low.

[0082] The control circuit places a thermistor and a heating resistor simultaneously within the vacuum pipeline. Based on the principle of gas molecular thermal conductivity, the control circuit calculates the number of gas molecules in the pipeline by controlling the power of the heating resistor and receiving the thermal power from the thermistor. It can also simultaneously derive the vacuum value data.

[0083] The display control screen is connected to the control circuit. Preferably, the display control screen is a capacitive touch screen, utilizing the human body current sensing phenomenon. A capacitor is formed between the finger and the screen, and a tiny current is absorbed when the finger touches, causing current to flow on the four electrodes on the touch panel. The display control circuit calculates the coordinates of the touch point by calculating the ratio of these four currents.

[0084] Preferably, the vacuum pump is a rotary vane vacuum pump. Two lines are led out from the pump body of the rotary vane vacuum pump and connected to the control circuit. A rotor is eccentrically installed inside the cavity of the vane pump, with the outer circle of the rotor tangent to the inner surface of the pump cavity (there is a small gap between them). Two spring-loaded vanes are installed in the rotor slot, dividing the stator into two working chambers (high-level working chamber and low-level working chamber). When rotating, the 2XZ type rotary vane vacuum pump uses centrifugal force and spring tension to keep the top of the vane in contact with the inner wall of the pump cavity. The rotation of the rotor drives the vanes to slide along the inner wall of the pump cavity, causing the volume of the high-level working chamber to periodically expand and inhale, while the volume of the low-level working chamber periodically decreases and compresses the gas. With the help of gas and oil pressure, the exhaust valve is pushed open to exhaust, thus obtaining a vacuum.

[0085] As an embodiment of the present disclosure, the vacuum pump assembly also includes a first temperature sensor and a second temperature sensor. Both the first temperature sensor and the second temperature sensor are connected to the control circuit. The first temperature sensor is used to detect the motor temperature T.sub.1 of the vacuum pump, and the second temperature sensor is used to detect the oil temperature T.sub.2 of the vacuum pump. By comparing and analyzing the motor temperature T.sub.1 and oil temperature T.sub.2 of the vacuum pump with the set protection temperature T.sub.0 respectively, it can avoid unnecessary damage to the vacuum pump due to excessive temperature, and also effectively improve the operational safety of the vacuum pump.

[0086] As an embodiment of the present disclosure, the control circuit includes a main control circuit, a power supply circuit for power supply, a clock circuit, a sensor signal processing circuit connected to the vacuum sensor, a solenoid valve control circuit connected to the solenoid valve, a display control circuit connected to the display control screen, a motor drive circuit connected to the motor, a temperature acquisition circuit connected to the first temperature sensor and the second temperature sensor, and a Bluetooth circuit for remote data transmission. All circuits are connected to the main control circuit, realizing real-time monitoring and automatic control of the vacuum pump.

[0087] In conclusion, the present disclosure provides a method and system for automatic control of a vacuum pump, which can realize remote control and automatic control of the vacuum pump through solenoid valves and control circuits, achieving separate and linked control of the motor and solenoid valve. By controlling the opening and closing of the solenoid valve, it maintains the vacuum level. Coupled with vacuum sensor and control circuits, it automatically closes the solenoid valve and vacuum pump after work completion, saving energy and electricity, reducing labor costs, and improving work efficiency. Through real-time detection and judgment of the temperature and leak tightness of the vacuum pump, it promptly shuts off the solenoid valve or motor when temperature or leak tightness abnormalities occur, avoiding damage to the vacuum pump and effectively improving its operational safety. After the system closes the solenoid valve and motor, it continues to monitor the system vacuum value, thereby realizing automatic startup of the vacuum pump. The system executes the vacuum pumping task again, achieving automatic switching between vacuum pumping tasks and vacuum maintenance tasks, maintaining the system's vacuum value within the set desired range.

[0088] It needs to be emphasized that: the above is only a preferred embodiment of the present disclosure and does not impose any form of limitation on the present disclosure. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present disclosure are still within the scope of the technical solution of the present disclosure.