FREEZE PREVENTION VALVE CAPABLE OF CONTROLLING DISCHARGE FLOW RATE ACCORDING TO TEMPERATURE

Abstract

The present invention relates to a freeze prevention valve capable of controlling a discharge flow rate according to a temperature. More particularly, the present invention relates to a freeze prevention valve capable of controlling a discharge flow rate according to a temperature, wherein the valve is to prevent freezing of a pipe by allowing a working fluid such as water flowing along various pipes including water pipes, faucets, and water meters to continuously flow without freezing at a temperature below a freezing point, and a shape memory elastic body which is a configuration of the valve can control a flow rate of the working fluid flowing out of the valve by proportionally changing a yield stress by a phase change according to a temperature of the working fluid instead of performing a simple opening/closing operation.

Claims

1. A freeze prevention valve capable of controlling a discharge flow rate according to a temperature comprising: a valve body having a working fluid inlet hole formed at an upper portion thereof so that a working fluid may flow thereinto; a disk which is located inside the valve body, has an opening/closing protrusion formed to protrude from an upper surface thereof, wherein the opening/closing protrusion inserted to the working fluid inlet hole formed in the valve body to block the working fluid from flowing into the valve body or withdrawn from the working fluid inlet hole to allow the working fluid to flow into the valve body through the working fluid inlet hole, and is lifted up or down in a vertical direction to perform an opening/closing operation of the working fluid inlet hole; a cap which is coupled to a lower portion of the valve body and has working fluid outlet holes 32 formed to allow the working fluid flowing into the valve body to flow out of the valve body; and a shape memory elastic body which is located between the disk and the cap, detects a temperature of external air or a working fluid, allows a yield stress to be changed according to the temperature of the external air or the working fluid, allows the opening/closing protrusion of the disk to be inserted or withdrawn into or from the working fluid inlet hole of the valve body by a water pressure of the working fluid acting to the disk, and allows the disk to perform an opening/closing operation.

2. The freeze prevention valve capable of controlling a discharge flow rate according to a temperature of claim 1, wherein the yield stress of the shape memory elastic body is changed in proportion to a change in detected temperature of the external air or working fluid, wherein when the changed yield stress is smaller than the water pressure of the working fluid, a length of the shape memory elastic body is contracted by the water pressure of the working fluid and then the opening/closing protrusion of the disk is withdrawn from the working fluid inlet hole of the valve body to perform an opening operation, and when the changed yield stress is larger than the water pressure of the working fluid, the length of the shape memory elastic body is expanded and then the opening/closing protrusion of the disk is inserted into the working fluid inlet hole of the valve body to perform a closing operation, and the yield stress of the shape memory elastic body is changed in proportion to a change in temperature of the external air or working fluid and a gap distance between the opening/closing protrusion of the disk and the working fluid inlet hole of the valve body is changed to control a flow rate of the working fluid flowing out of the valve body.

3. The freeze prevention valve capable of controlling a discharge flow rate according to a temperature of claim 1, wherein the shape memory elastic body primarily detects a temperature of external air heat-transferred to the valve body to allow the disk to perform an initial opening operation and secondarily detects the temperature of the working fluid when the working fluid flowing into the valve body is in direct contact with the shape memory alloy by the initial opening operation of the disk so that the yield stress is changed proportionally according to a temperature of the working fluid.

Description

DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a view illustrating an internal configuration of a freeze prevention valve capable of controlling a discharge flow rate according to a temperature according to a preferred embodiment of the present invention.

[0017] FIG. 2 is a view illustrating a straight valve body.

[0018] FIG. 3 is a view illustrating a T-shaped valve body.

[0019] FIG. 4 is a view illustrating a disk.

[0020] FIG. 5 is a view illustrating a cap.

[0021] FIG. 6 is a view illustrating a change fraction of a shape memory elastic body according to a change in temperature of a working fluid.

[0022] FIG. 7 is a view illustrating a discharge flow rate according to a change in temperature of a working fluid detected by a shape memory elastic body.

MODES OF THE INVENTION

[0023] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, when reference numerals refer to components of each drawing, it is to be noted that although the same components are illustrated in different drawings, the same components are denoted by the same reference numerals as possible. In the following description, a detailed explanation of related known configurations or functions may be omitted to avoid obscuring the subject matter of the present invention. Further, hereinafter, the preferred embodiment of the present invention will be described, but the technical spirit of the present invention is not limited thereto or restricted thereby and the embodiments can be modified and variously executed by those skilled in the art.

[0024] FIG. 1 is a view illustrating an internal configuration of a freeze prevention valve capable of controlling a discharge flow rate according to a temperature according to a preferred embodiment of the present invention, FIG. 2 is a view illustrating a straight valve body, FIG. 3 is a view illustrating a T-shaped valve body, FIG. 4 is a view illustrating a disk, FIG. 5 is a view illustrating a cap, FIG. 6 is a view illustrating a change fraction of a shape memory elastic body according to a change in temperature of a working fluid, and FIG. 7 is a view illustrating a discharge flow rate according to a change in temperature of a working fluid detected by a shape memory elastic body.

[0025] Referring to FIGS. 1 to 5, a freeze prevention valve capable of controlling a discharge flow rate according to a temperature according to a preferred embodiment of the present invention includes a valve body 10, a disk 20, a cap 30, a shape memory elastic body 40, and an airtight member 50.

[0026] Further, the freeze prevention valve capable of controlling the discharge flow rate according to the temperature according to the present invention is a valve for preventing freezing of a pipe by allowing a working fluid such as water flowing along various pipes including water pipes, faucets, and water meters to continuously flowing without freezing at a temperature below a freezing point, and a shape memory elastic body which is a configuration of the valve can control a flow rate of the working fluid flowing out of the valve by proportionally changing a yield stress by a phase change according to a temperature of the working fluid instead of performing a simple opening/closing operation.

[0027] Further, the shape memory elastic body 40 of the present invention primarily detects an external temperature to perform an initial opening/closing operation and then secondarily detects a temperature of a working fluid flowing into the valve to perform an opening/closing operation capable for controlling a flow rate flowing out of the valve.

[0028] Hereinafter, constituent elements of the freeze prevention valve capable of controlling the discharge flow rate according to the temperature according to the preferred embodiment of the present invention will be described in detail.

[0029] Referring to FIGS. 1 to 3, the valve body 10 is coupled on a pipe in which a working fluid such as water flows, such as a water pipe and a water meter and has a working fluid inlet hole 12 formed on an upper surface of the valve body 10 so that the working fluid may flow into the valve body 10.

[0030] The valve body 10 may use a straight valve body installed on a passage in which the working fluid flows in the pipe as illustrated in FIG. 2 and a T-shaped valve body installed at an end of the pipe as illustrated in FIG. 3.

[0031] Referring to FIG. 1, the disk 20 is lifted up or down in a vertical direction by an interaction between water pressures of the working fluid flowing along the shape memory elastic body 40 to be described below and the pipe and performs an opening/closing operation of allowing the working fluid to flow into the valve body 10 by opening the working fluid inlet hole 12 formed in the valve body 10 or blocking the working fluid from flowing into the valve body 10 by closing the working fluid inlet hole 12.

[0032] Referring to FIGS. 1 and 4, the disk 20 is located inside the valve body 10 and an opening/closing protrusion 22 protrudes from an upper side on an upper surface of the disk 20.

[0033] As illustrated in FIG. 1, the opening/closing protrusion 22 of the disk 20 is inserted into the working fluid inlet hole 12 formed in the valve body 10 to block the working fluid from flowing into the valve body 10 and withdrawn from the working fluid inlet hole 12 to allow the working fluid to flow into the valve body 10.

[0034] Referring to FIGS. 1 and 4, an upper elastic body insertion groove 24 to which an upper portion of the shape memory elastic body 40 described below may be inserted and coupled is formed below the disk 20.

[0035] Further, when the working fluid flows into the valve body through the working fluid inlet hole 12 of the valve body 10, in order to allow the working fluid to smoothly flow downward to the disk, as illustrated in FIG. 4, one or more working fluid flowing grooves 26 may be formed in the disk to be spaced apart from each other along a periphery of the disk.

[0036] Referring to FIGS. 1 and 5, the cap 30 is coupled to a low portion of the valve body 10 and one or more working fluid outlet holes 32 are formed to allow the working fluid flowing into the valve body 10 to flow out of the valve body 10.

[0037] Further, a lower elastic body insertion groove 34 to which an upper portion of the shape memory elastic body 40 described below may be inserted and coupled is formed below the cap 30.

[0038] As illustrated in FIG. 1, the shape memory elastic body 40 is located between the disk 20 and the cap 30.

[0039] Specifically, the upper portion of the shape memory elastic body 40 is inserted and coupled to the upper elastic body insertion groove 24 formed below the disk 20 and the lower portion of the shape memory elastic body 40 is inserted and coupled to the lower elastic body insertion groove formed above the cap 30.

[0040] The shape memory elastic body 40 is manufactured by annealing and heating at a predetermined temperature range 300 C. to 600 C. and designed to detect a temperature by heat transfer of external air or the working fluid and change the yield stress and strain by a phase change as the temperature of the external air or the working fluid is changed.

[0041] The shape memory elastic body 40 detects the temperature of the external air or the working fluid, and the yield stress is changed by a phase change according to a temperature of the external air or the working fluid and thus, the rigidity of the shape memory elastic body 40 is changed.

[0042] Further, as the yield stress of an shape memory alloy changed according to a temperature is larger or smaller than a water pressure of the working fluid, the opening/closing protrusion 22 of the disk 20 is withdrawn or inserted from or into the working fluid inlet hole 12 of the valve body 10 to allow the disk 20 to perform the opening/closing operation.

[0043] Specifically, as illustrated in FIG. 6, a phase change is gradually performed in the memory elastic body 40 in proportion to the temperature change of the external air or working fluid detected by the shape memory elastic body 40, and thus the yield stress is also gradually changed. In the shape memory elastic body 40, at 0 C. or higher, the yield stress of a water pressure (3.0 atm) or more of the working fluid flowing into the pipe such as a general water pipe is maintained, and at 0 C. or lower, the yield stress becomes a water pressure (3.0 atm) or less of the working fluid by a phase change. As the temperature of the external air or working fluid is more lowered, the yield stress is gradually decreased in proportion thereto and the strain is also gradually and largely changed, and thus a discharge amount of the working fluid discharged through the working fluid outlet hole of the cap is increased.

[0044] Here, in the case where the yield stress changed according to the temperature of the external air or working fluid is smaller than the water pressure of the working fluid, that is, when the rigidity of the shape memory elastic body 40 is smaller than the water pressure of the working fluid, when the disk 20 is pushed downward by the water pressure of the working fluid, the opening/closing protrusion 22 of the disk 20 is withdrawn from the working fluid inlet hole 12 of the valve body 10 to perform the opening operation while the shape memory elastic body 40 is contracted in a length direction. At this time, the working fluid flows into the valve body 10 through the working fluid inlet hole 12.

[0045] Further, in the case where the yield stress of the shape memory elastic body 40 changed according to the temperature of the external air or working fluid is larger than the water pressure of the working fluid, when the disk 20 is pushed upward while the shape memory elastic body 40 is expended in a length direction, the opening/closing protrusion 22 of the disk 20 is inserted into the working fluid inlet hole 12 of the valve body 10 to perform the closing operation. At this time, the working fluid does not flow into the valve body 10 through the working fluid inlet hole 12.

[0046] Meanwhile, in the shape memory elastic body 40, the yield stress is changed in proportion to a temperature change of the external air or working fluid to change a gap distance between the opening/closing protrusion 22 of the disk 20 and the working fluid inlet hole 12 of the valve body 10.

[0047] As illustrated in FIG. 7, a change in the gap distance controls a flow rate of the working fluid flowing into the valve body 10 through the working fluid inlet hole 12 according to a temperature detected by the shape memory elastic body 40, and as a result, may control a flow rate of the working fluid flowing out of the valve body 10 through the working fluid outlet hole 32 formed in the cap 30.

[0048] In other words, as the temperature of the external air or working fluid is gradually lowered at 0 C. or lower, while a gap distance between the opening/closing protrusion 22 of the disk 20 and the working fluid inlet hole 12 of the valve body 10 is gradually increased, a large amount of working fluid flows into the valve body 10 through the working fluid inlet hole 12 and simultaneously, the flowed working fluid flows out of the valve body 10 through the working fluid outlet hole 32 formed in the cap 30.

[0049] Table 1 below illustrates experimental results for the freeze prevention valve capable of controlling the discharge flow rate according to the temperature according to the present invention by data and FIG. 7 illustrates the data of Table 1 by a graph. As seen in Table 1 and FIG. 7, it may be confirmed that as the temperature detected by the shape memory elastic body 40 is lowered, the discharged flow rate is increased proportionally.

TABLE-US-00001 TABLE 1 Time Temperature Discharge amount Discharge amount (min) ( C.) (mL) (mL/min) 0 21 0 0 10 3 0 0 45 3 0 0 48 2 0 0 83 1 0 0 97 0 60 1 116 1 300 5 137 1 168 3 300 5 194 3 330 5.5 210 4 330 5.5 219 6 420 7 254 7 540 9 275 8 540 9 293 8 540 9 343 11 600 10 365 14 630 10.5 378 14 660 11 401 15 720 12 417 16 660 11 434 16 660 11 447 17 780 13 459 19 720 12 468 20 810 13.5 479 20 810 13.5 495 20 810 13.5

[0050] Meanwhile, the shape memory elastic body 40 primarily detects a temperature of external air heat-transferred to the valve body 10 to allow the disk 20 to perform an initial opening operation.

[0051] Further, when the working fluid flowing into the valve body 10 through the working fluid inlet hole 12 is in direct contact with the shape memory alloy by the initial opening operation of the disk 20, the shape memory elastic body 40 secondarily detects the temperature of the working fluid so that the yield stress is changed proportionally according to a temperature of the working fluid.

[0052] Referring to FIG. 1, in the airtight member 50, an elastic member such as robber and silicon may be used in an O-ring shape and provided to be extrapolated to an outer peripheral surface of the opening/closing protrusion 22 formed on the disk 20.

[0053] The airtight member 50 is provided to maintain an airtight state between the disk 20 and the working fluid inlet hole 12 so as to prevent the working fluid from flowing into the valve body 10 while the opening/closing protrusion 22 formed on the disk 20 is inserted into the working fluid inlet hole 12 formed in the valve body 10, that is, while the working fluid is blocked not to flow into the valve body 10 through the working fluid inlet hole 12.

[0054] The above description just illustrates the technical spirit of the present invention and various changes, modifications, and substitutions can be made by those skilled in the art to which the present invention pertains without departing from an essential characteristic of the present invention. Therefore, the exemplary embodiments and the accompanying drawings disclosed in the present invention are used to not limit but describe the technical spirit of the present invention and the scope of the technical spirit of the present invention is not limited by the exemplary embodiments and the accompanying drawings. The protective scope of the present invention should be construed based on the appended claims, and all the technical spirits in the equivalent scope thereof should be construed as falling within the scope of the present invention.

TABLE-US-00002 [Explanation of reference numerals and symbols] 10: Valve body 12: Working fluid inlet hole 20: Disk 22: Opening/closing protrusion 24: Upper elastic body 26: Working fluid insertion groove flowing groove 30: Cap 32: Working fluid outlet hole 34: Lower elastic body 40: Shape memory insertion groove elastic body 50: Airtight member