Drain valve

Abstract

This application provides a drain valve comprising: a valve body having sequentially arranged inlet, housing chamber and drain port, with the inlet and drain port communicating with the housing chamber; a valve core movably disposed within the housing chamber to open or close the drain port, the valve core being provided with a flow channel structure, wherein when the valve core opens the drain port, the first end of the flow channel structure communicates with the inlet, the second end of the flow channel structure communicates with the drain port, and the inlet communicates with the drain port via the flow channel structure; and a memory alloy spring and a return spring, both disposed within the housing chamber, the memory alloy spring and the return spring apply opposing forces to the valve core in the axial direction of the valve body, causing the valve core to open or close the drain port. The technical solution provided in this application solves the problem in the prior art where a drain valve is driven by a thermostat to open or close the drain port, resulting in a short thermostat lifespan and low control accuracy.

Description

Technical Field

[0001] This application claims the priority of a patent application with the application number 202321157729.0 and the invention title of Drain Valve, which was filed with the China National Intellectual Property Administration on May 11, 2023.

[0002] This application relates to the technical field of drain valves, specifically to drain valves.

Background Art

[0003] Conventional drain valves generally drive the valve core to close and open the drain port through the cooperation of a thermostat and a return spring. Specifically, the thermostat can move according to the change of the ambient temperature. When the ambient temperature is high or normal, the thermostat expands due to heat, so the thermostat presses against the valve core and moves in the direction of the drain port to close the drain port. At this time, the return spring will contract. However, when the ambient temperature is low, the thermostat cools and contracts, so the thermostat moves away from the drain port. As a result, a gap is generated between the thermostat and the valve core. At this time, the return spring extends and drives the valve core in the direction away from the drain port until the drain port is opened. However, the thermostat is generally formed by sealing the temperature-sensitive liquid with rubber. The liquid inside the thermostat has a risk of deterioration and leakage, has a relatively short lifespan, and has a slow reaction speed to temperature, so the control accuracy is relatively inaccurate.

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application provides a drain valve to solve the problems in the prior art that when the drain valve drives the valve core to open or close the drain port by a thermostat, the lifespan of the thermostat is short and the control accuracy is low.

Means for Solving the Problems

[0005] This application provides a drain valve comprising: a valve body having sequentially arranged inlet, housing chamber and drain port, with the inlet and drain port each communicating with the housing chamber; a valve core movably disposed within the housing chamber to open or close the drain port, the valve core being provided with a flow channel structure, wherein when the valve core opens the drain port, the first end of the flow channel structure communicates with the inlet, the second end of the flow channel structure communicates with the drain port, and the inlet communicates with the drain port via the flow channel structure; and a memory alloy spring and a return spring, both disposed within the housing chamber, the memory alloy spring and the return spring exert opposing forces on the valve core in the axial direction of the valve body, causing the valve core to open or close the drain port.

[0006] By applying the technical solution of this application, the drain valve of this solution drives the valve core through the cooperation of a memory alloy spring and a return spring to open or close the drain port. As a result, the drain valve of this solution has a long lifespan and high control accuracy. Specifically, when the drain valve is operated, the memory alloy spring can sense the temperature change of the fluid in the containment chamber. When the temperature of the fluid in the containment chamber changes, the memory alloy spring expands or contracts. When the memory alloy spring expands, it drives the return spring to contract, driving the valve core to open or close the drain port. When the memory alloy spring contracts, the return spring expands, driving the valve core to open or close the drain port. In the prior art, drain valves sense the temperature of the fluid inside the valve body using a thermostat, which drives the valve core to open or close the drain port. Thermostats are generally formed by sealing a temperature-sensing liquid with rubber, so the liquid inside the thermostat is at risk of deterioration and leakage, resulting in a relatively short lifespan. Compared to conventional technical solutions, the return spring and memory alloy spring of this solution do not suffer from the above-mentioned problems, and the lifespan of the return spring and memory alloy spring is longer than that of the thermostat. Furthermore, since the temperature-sensing liquid inside the thermostat does not come into direct contact with the fluid inside the valve body, the temperature-sensing liquid inside the thermostat cannot come into direct contact with the fluid inside the valve body, resulting in a relatively slow temperature sensing speed and relatively low control accuracy. The memory alloy spring of this solution comes into direct contact with the fluid inside the valve body, resulting in a relatively fast temperature sensing speed and relatively high control accuracy. Moreover, in this solution, by installing a flow path structure, a certain space is provided for fluid flow, sufficient flow area is secured, and fluid flow resistance can be reduced, and in the case of the same drain port, the drain valve of this solution achieves a larger drainage flow rate.

[0007] Furthermore, the housing chamber includes a guide chamber and a communication chamber that are in constant communication with each other, and the valve core includes a first segment and a second segment arranged in a stepped manner in the axial direction, the diameter of the first segment being larger than the diameter of the second segment, the first segment being guided and engaged with the guide chamber, the end of the second segment away from the first segment being used to close the drain port, there being a flow chamber between the communication chamber and the second segment, the second end of the flow channel structure being in communication with the flow chamber, and when the valve core opens the drain port, the flow chamber is in communication with the drain port. With the above installation, the structure of the valve core and the structure of the housing chamber are made compatible, enabling not only guided engagement between the valve core and the valve body, but also communication between the flow channel structure and the drain port when the drain port is open.

[0008] Furthermore, the flow path structure includes interconnected flow passages and flow holes, with one end of the flow passage extending to the end face of the valve core adjacent to the inlet and communicating with the inlet, and the flow hole being provided in the side wall of the valve core and penetrating the side wall of the valve core. By installing it in this manner, it is further guaranteed that the flow path structure has a sufficient flow area, and the smoothness of fluid flow can be further ensured.

[0009] Furthermore, the flow passage extends from the end of the valve core near the inlet to the second segment, and the flow hole is provided in the side wall of the second segment. This configuration facilitates the processing and molding of the flow hole. In addition, the flow hole communicates with the end of the flow passage near the drain outlet, and this configuration ensures that the fluid in the flow passage is always in a flowing state, thus guaranteeing smooth fluid flow.

[0010] Furthermore, the second segment includes a main segment and a closing segment arranged in a stepped manner in the axial direction, the diameter of the main segment being larger than the diameter of the closing segment, the main segment being connected to the first segment, the flow hole being provided in the side wall of the main segment, and the closing segment being able to be inserted into the drain opening to close the drain opening. By installing it in this manner, the airtightness of the closing segment when closing the drain opening can be ensured.

[0011] Furthermore, the second segment further includes a connecting segment, which is located between the main segment and the closing segment, and the diameter of the connecting segment is smaller than the diameter of the drain opening. When the valve core opens the drain opening, the connecting segment is inserted into the drain opening, the main segment is located on one side of the drain opening, and the closing segment is located on the other side of the drain opening. By installing it in this way, the valve core can close the drain opening to form another type of drain valve, thus improving the applicability of this solution.

[0012] Furthermore, the memory alloy spring is positioned within the flow passage, and is located at the end of the flow passage close to the inlet. One end of the memory alloy spring abuts against the valve body, and the other end abuts against the valve core. By installing it in this manner, the drain valve of this solution can be miniaturized in the axial direction, and as a result, the compactness of the drain valve structure of this solution can be ensured. In addition, because the memory alloy spring is closer to the inlet, the accuracy of sensing the fluid temperature becomes more precise.

[0013] Furthermore, the outer wall of the memory alloy spring is guided and engaged with the inner wall of the flow passage, and / or the return spring is located in the communication chamber, the return spring is fitted onto the outer circumference of the second segment, one end of the return spring abuts against the valve body, the other end of the return spring abuts against the valve core, and the outer wall of the return spring is guided and engaged with the inner wall of the communication chamber. By installing it in this manner, the stability of the memory alloy spring and the return spring during the expansion and contraction process is ensured, the stability of the memory alloy spring and the return spring during the process of driving the valve core is ensured, and the stability of opening and closing the valve core is ensured.

[0014] Furthermore, a position-restricting structure is provided between the valve body and the valve core. This structure is used to limit the distance the valve core moves from the drain outlet to the inlet. The installation of this position-restricting structure ensures the stability of the valve core when the valve is stopped.

[0015] Furthermore, the valve body includes a main body having a mounting opening, a housing chamber, and a drain opening, with the mounting opening and drain opening located at both ends of the main body in the axial direction, and an end cover provided separately from the main body, with the end cover positioned at the mounting opening and the end cover having an inlet. By installing it in this manner, the assembly of the valve core, memory alloy spring, and return spring into the valve body can be facilitated.

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application, and the exemplary embodiments and descriptions herein are for interpretive purposes only and do not unduly limit this application. In the accompanying drawings, [Brief explanation of the drawing]

[0017] [Figure 1] This diagram shows a schematic structure of the drain valve according to the first embodiment of this application when the drain port is open. [Figure 2] This diagram shows a schematic structure of the drain valve according to the first embodiment of this application when it blocks the drain port. [Figure 3] This shows a cross-sectional view of the valve core according to the first embodiment of this application. [Figure 4] A schematic diagram of the valve core structure according to the first embodiment of this application is shown. [Figure 5] This diagram shows a schematic structure of the drain valve according to the second embodiment of this application when the drain port is open. [Figure 6] This diagram shows a schematic structure of the drain valve according to the second embodiment of this application when it blocks the drain port. [Figure 7] This shows a cross-sectional view of a valve core according to the second embodiment of this application. [Figure 8] The schematic structure of the valve core according to the second embodiment of this application is shown. [Modes for carrying out the invention]

[0018] The following describes the technical solutions in the embodiments of this application in conjunction with the accompanying drawings of the embodiments, but it is clear that the embodiments described are only a part of the embodiments of this application and not all of them. The following description of at least one exemplary embodiment is in fact merely illustrative and is not intended to impose any limitations on this application or its application or use. All other embodiments that a person skilled in the art could obtain without creative effort based on the embodiments of this application are all within the scope of protection of this application.

[0019] As shown in Figures 1 to 4, the first embodiment of this application provides a drain valve including a valve body 10, a valve core 20, a memory alloy spring 30, and a return spring 40. The valve body 10 has sequentially arranged inlet 101, a housing chamber 102, and a drain port 103, with the inlet 101 and the drain port 103 communicating with the housing chamber 102, respectively. The valve core 20 is movably positioned within the housing chamber 102 to open or close the drain port 103, and the valve core 20 is provided with a flow path structure 201. When the valve core 20 opens the drain port 103, the first end of the flow path structure 201 communicates with the inlet 101, the second end of the flow path structure 201 communicates with the drain port 103, and the inlet 101 communicates with the drain port 103 via the flow path structure 201. The memory alloy spring 30 and the return spring 40 are both placed in the housing chamber 102, and the memory alloy spring 30 and the return spring 40 exert opposing forces on the valve core 20 in the axial direction of the valve body 10, causing the valve core 20 to open or close the drain port 103.

[0020] If the technical solution of the present application is applied, the drain valve of this solution drives the valve core 20 through the cooperation of the shape memory alloy spring 30 and the return spring 40 to open or close the drain port 103. Therefore, the drain valve of this solution has a long lifespan and high control accuracy. Specifically, when the drain valve operates, the shape memory alloy spring 30 can sense the temperature change of the fluid in the accommodation chamber 102. Therefore, when the temperature of the fluid in the accommodation chamber 102 changes, the shape memory alloy spring 30 expands or contracts. When the shape memory alloy spring 30 expands, the shape memory alloy spring 30 drives the return spring 40 to contract and drives the valve core 20 to close or open the drain port 103. However, when the shape memory alloy spring 30 contracts, the return spring 40 expands and drives the valve core 20 to close or open the drain port 103. The drain valve in the prior art senses the temperature of the fluid in the valve body through a thermostat and thereby drives the valve core to close or open the drain port. Since the thermostat is generally formed by sealing a temperature-sensitive liquid with rubber, the liquid inside the thermostat has a risk of deterioration and leakage, and its lifespan is relatively short. Compared with the conventional technical solution, the above problems do not occur in the return spring 40 and the shape memory alloy spring 30 of this solution, and the lifespan of the return spring 40 and the shape memory alloy spring 30 is longer than that of the thermostat. Furthermore, in the prior art, since the temperature-sensitive liquid inside the thermostat does not directly contact the fluid inside the valve body, the temperature-sensitive liquid inside the thermostat cannot directly contact the fluid inside the valve body, and the sensing speed of the temperature-sensitive liquid with respect to temperature is relatively slow, and the control accuracy is relatively low. The shape memory alloy spring 30 of this solution is in direct contact with the fluid in the valve body 10, has a relatively fast sensing speed with respect to temperature change, and has a relatively high control accuracy. Furthermore, in this solution, by installing the flow path structure 201, a certain space is provided for the flow of the fluid, a sufficient flow area is ensured, the flow resistance of the fluid can be reduced, and in the case of the same drain port 103, the drain valve of this solution can achieve a larger drainage flow rate.

[0021] Specifically, the accommodation chamber 102 includes a guide chamber and a communication chamber that are interconnected, and the guide chamber and the communication chamber are distributed along the direction from the inlet 101 to the drain outlet 103. The valve core 20 includes a first segment 21 and a second segment 22 that are arranged in a stepped manner in the axial direction, and the first segment 21 and the second segment 22 are distributed along the direction from the inlet 101 to the drain outlet 103. The diameter of the first segment 21 is larger than the diameter of the second segment 22. The first segment 21 is engaged in the guide chamber in a guiding manner. The end of the second segment 22 away from the first segment 21 is used to block the drain outlet 103. There is a flow-through chamber 1021 between the communication chamber and the second segment 22. The second end of the flow path structure 201 communicates with the flow-through chamber 1021. When the valve core 20 opens the drain outlet 103, the flow-through chamber 1021 communicates with the drain outlet 103.

[0022] In this embodiment, the first segment 21 is snugly fit with the guide chamber, and the outer diameter of the second segment 22 is smaller than the inner diameter of the communication chamber. With the above installation, the structure of the valve core 20 and the structure of the accommodation chamber 102 are adapted to each other, so that the guiding engagement between the valve core 20 and the valve body 10 can be realized. In addition, when the drain outlet 103 is open, the communication between the flow path structure 201 and the drain outlet 103 can also be realized.

[0023] Specifically, when the valve core 20 moves, the first segment 21 engages with the guide chamber in a guiding manner, ensuring the stability of the movement process of the valve core 20, ensuring the coaxiality between the valve core 20 and the drain outlet 103, and ensuring the smoothness during valve opening and closing. In addition, a flow-through chamber 1021 is formed between the communication chamber and the second segment 22. Thereby, when the valve core 20 opens the drain outlet 103, the second end of the flow path structure 201 can communicate with the drain outlet 103 through the flow-through chamber 1021. That is, in the drain valve of this solution, when the drain outlet 103 is open, the fluid passes through the inlet 101, the flow path structure 201 on the valve core 20, and the flow-through chamber 1021 in sequence and flows out from the drain outlet 103.

[0024] As shown in Figures 1 and 3, in this solution, the flow path structure 201 includes interconnected flow passages 2011 and flow holes 2012, with one end of the flow passage 2011 extending to the end face of the valve core 20 adjacent to the inlet 101 and communicating with the inlet 101, and the flow hole 2012 being provided in the side wall of the valve core 20 and penetrating the side wall of the valve core 20.

[0025] In this solution, the inlet 101, the containment chamber 102, and the drain port 103 are arranged sequentially along the axial direction of the valve body 10, the direction of extension of the flow passage 2011 is the same as the direction of extension of the valve body 10, and the flow area at the first end of the flow passage 2011 is larger than the flow area of ​​the inlet 101. Furthermore, this solution does not impose any restrictions on the specific number or shape of the flow holes 2012, and in this embodiment, four flow holes 2012 are provided at intervals along the circumferential direction of the valve core 20. By installing it in this way, it is possible to further ensure that the flow passage structure 201 has a sufficient flow area and to ensure the smooth flow of fluid.

[0026] Furthermore, the flow passage 2011 extends from one end of the valve core 20 adjacent to the inlet 101 to the second segment 22, and the flow hole 2012 is provided in the side wall of the second segment 22. In this solution, a stepped structure is formed between the first segment 21 and the second segment 22, and in some embodiments of this solution, the flow hole 2012 may be provided penetrating the stepped structure along the axial direction.

[0027] In this embodiment, the flow hole 2012 is provided in the side wall of the second segment 22, and by installing it in this manner, the processing and molding of the flow hole 2012 can be facilitated. Furthermore, this flow hole 2012 is in communication with the end of the flow passage 2011 adjacent to the drain port 103, and by installing it in this manner, the fluid in the flow passage 2011 can be kept in a constant flow state, ensuring smooth fluid flow.

[0028] In this solution, the second segment 22 includes a main segment 221 and a closing segment 222 arranged in a stepped manner in the axial direction, the diameter of the main segment 221 is larger than the diameter of the closing segment 222, the main segment 221 is connected to the first segment 21, the flow hole 2012 is provided on the side wall of the main segment 221, and the closing segment 222 can be inserted into the drain port 103 to close the drain port 103. By installing it in this way, the airtightness of the closing segment 222 when closing the drain port 103 can be ensured.

[0029] As shown in Figures 1 and 3, an engagement groove is provided at the end of the closing segment 222 adjacent to the main segment 221, and the engagement groove is arranged in a ring shape on the outer circumference of the closing segment 222. The drain valve further includes a sealing member 50, which is arranged in a ring shape within the engagement groove, and when the closing segment 222 closes the drain port 103, the sealing member 50 engages with the drain port 103 in a sealing manner. By installing it in this manner, the sealing effect on the drain port 103 can be further ensured.

[0030] As shown in Figures 1 and 2, the memory alloy spring 30 is further positioned within the flow passage 2011, and is located at the end of the flow passage 2011 adjacent to the inlet 101, with one end of the memory alloy spring 30 in contact with the valve body 10 and the other end of the memory alloy spring 30 in contact with the valve core 20.

[0031] Specifically, the flow passage 2011 includes a first passage and a second passage arranged sequentially along the direction from the inlet 101 to the drain 103, the diameter of the first passage being larger than the diameter of the inlet 101 and the diameter of the second passage being larger, a first stepped surface being formed between the first passage and the second passage, the memory alloy spring 30 being placed in the first passage, one end of the memory alloy spring 30 being in contact with and engaged with the first stepped surface, and the other end of the memory alloy spring 30 being in contact with and engaged with the inner end surface of the end of the valve body 10 away from the drain 103, that is, the inner diameter of the memory alloy spring 30 being larger than the diameter of the inlet 101. By installing it in this way, the assembly of the memory alloy spring 30 and the valve core 20 can be made easy, and the compactness of the structure of the memory alloy spring 30 and the valve core 20 can be ensured, and as a result the drain valve can be made smaller in the axial direction. Furthermore, with the above-described installation, the projection of the memory alloy spring 30 is located outside the inlet 101 in the axial direction of the valve body 10, thus preventing the fluid from directly colliding with the memory alloy spring 30 and ensuring smooth fluid flow. By placing the memory alloy spring 30 within the first passage and positioning it as close to the inlet 101 as possible, timely contact between the memory alloy spring 30 and the fluid is ensured, thereby ensuring the memory alloy spring 30's sensitivity to fluid temperature and ensuring control accuracy.

[0032] Specifically, the outer wall of the memory alloy spring 30 is guided and engaged with the inner wall of the flow passage 2011. By installing it in this manner, the stability of the memory alloy spring 30 during expansion and contraction can be ensured. In this embodiment, the outer wall of the memory alloy spring 30 is clearance-fitted with the first passage, thereby achieving guided engagement between the valve core 20 and the memory alloy spring 30. The above installation is structurally simple, easy to implement, and provides good guiding effect.

[0033] As shown in Figures 1 and 2, the return spring 40 is further located in the communication chamber, fitted onto the outer circumference of the second segment 22, with one end of the return spring 40 in contact with the valve body 10 and the other end of the return spring 40 in contact with the valve core 20, and the outer wall of the return spring 40 is guided and engaged with the inner wall of the communication chamber. In other words, in this embodiment, the outer wall of the return spring 40 is clearance-fitted with the communication chamber, thereby achieving guided engagement between the return spring 40 and the valve body 10, and ensuring the stability of the return spring 40 during the expansion and contraction process.

[0034] In this solution, the memory alloy spring 30 can either contract or expand when the fluid temperature decreases. In this embodiment, when the fluid temperature decreases, the memory alloy spring 30 contracts and the return spring 40 expands, driving the valve core 20 toward the inlet 101 and opening the drain port 103.

[0035] Furthermore, a position-restricting structure is provided between the valve body 10 and the valve core 20, which is used to limit the distance the valve core 20 moves from the drain port 103 towards the inlet 101. By installing the position-restricting structure, the valve core 20 can always stop at the same position when the drain port 103 is opened, meaning that the amount of change in the memory alloy spring 30 and the amount of change in the return spring 40 can be the same each time the drain port 103 is opened or closed, thus ensuring the service life of the memory alloy spring 30 and the return spring 40.

[0036] In this embodiment, when the fluid temperature decreases, the memory alloy spring 30 and the return spring 40 work together to drive the valve core 20 toward the inlet 101, moving it until the end face of the end of the valve core 20 that is close to the inlet 101 contacts and engages with the inner end face of the end of the valve body 10 that is away from the drain port 103. The end face of the end of the valve core 20 that is close to the inlet 101 engages with the inner end face of the end of the valve body 10 that is away from the drain port 103 to form a position regulating structure. By installing it in this way, it is not necessary to install additional parts to form the position regulating structure, the structure is simple, and because the two end faces are in surface contact, stability is ensured when the valve core 20 stops moving when the valve is opened.

[0037] Specifically, the valve body 10 includes a main body 11 and an end cover 12. The main body 11 has a mounting opening 111, a housing chamber 102, and a drain opening 103, with the mounting opening 111 and the drain opening 103 located at both ends of the main body 11 in the axial direction of the main body 11, while the end cover 12 is provided separately from the main body 11, and the end cover 12 is attached to the mounting opening 111 and has an inlet 101. In this embodiment, the end cover 12 has a circular, flat structure, and the end cover 12 is fitted into the mounting opening 111 and interferes with the mounting opening 111, and the end cover 12 is riveted to the main body 11. That is, in this embodiment, the end face of the end of the valve core 20 that is close to the inlet 101 is in positional limiting engagement with the inner end face of the end cover 12. The above installation has a simple structure, and it is easy to assemble the valve core 20, memory alloy spring 30, and return spring 40 inside the valve body 10.

[0038] Furthermore, the diameter of the mounting opening 111 is larger than the diameter of the guide chamber, and a second stepped surface is formed between the mounting opening 111 and the guide chamber. The end face of the end cover 12 adjacent to the drain opening 103 is in contact with and engaged with the second stepped surface. By installing it in this manner, the robustness and convenience of assembling the end cover 12 can be further ensured.

[0039] In this embodiment, the water temperature for valve opening is set to 0-3°C. When the water temperature reaches this temperature range, the memory alloy spring 30 contracts, and the spring force of the return spring 40 becomes greater than that of the memory alloy spring 30. As a result, the return spring 40 extends, and the valve core 20 moves toward the inlet 101, thereby opening the valve. When the water temperature exceeds 3-5°C, the memory alloy spring 30 extends, and the spring force of the memory alloy spring 30 becomes greater than that of the return spring 40. As a result, the valve core 20 moves toward the inlet 101, thereby closing the valve.

[0040] As shown in Figures 5 to 8, a second embodiment of the present application provides a drain valve which differs from the first embodiment in the following ways: When the fluid temperature decreases, the memory alloy spring 30 expands, and the memory alloy spring, via the valve core 20, drives the return spring 40 to contract, and also drives the valve core 20 to move away from the inlet 101, thereby opening the drain port 103.

[0041] Specifically, the second segment 22 further includes a connecting segment 223, which is located between the main segment 221 and the closing segment 222. The diameter of the connecting segment 223 is smaller than the diameter of the drain port 103. When the valve core 20 opens the drain port 103, the connecting segment 223 is inserted into the drain port 103, creating a flow gap for fluid flow between the connecting segment 223 and the drain port 103, so that the main segment 221 is located on one side of the drain port 103 and the closing segment 222 is located on the other side. When the drain valve is in the closed state, the end face of the end of the valve core 20 closest to the inlet 101 is in contact with and engaged with the inner end face of the end of the valve body 10 away from the drain port 103.

[0042] Furthermore, an insertion hole 112 is provided at one end of the main body 11, away from the end cover 12. The insertion hole 112 is coaxial with the drain port 103, and the diameter of the insertion hole 112 is larger than the diameter of the drain port 103. Therefore, when the drain port 103 is open, the blocking segment 222 is located inside the insertion hole 112. By installing it in this way, the blocking segment 222 can be located inside the insertion hole 112 when the valve is open, thus preventing damage to the valve core 20 due to contact between the blocking segment 222 and other parts.

[0043] In this embodiment, the water temperature for valve opening is set to 0-3°C. When the water temperature reaches this temperature range, the memory alloy spring 30 stretches, and the spring force of the memory alloy spring 30 becomes greater than the spring force of the return spring 40. As a result, the memory alloy spring 30 stretches, and the valve core 20 moves away from the inlet 101 until the connecting segment 223 is inserted into the drain port 103, thereby opening the valve. When the water temperature exceeds 3-5°C, the memory alloy spring 30 contracts, and the spring force of the return spring 40 becomes greater than the spring force of the memory alloy spring 30. As a result, the valve core 20 moves towards the inlet 101 until the closing segment 222 is inserted into the drain port 103, thereby closing the valve.

[0044] It should be noted that the terminology used herein is solely for the purpose of describing specific embodiments and is not intended to limit the exemplary embodiments described herein. As used herein, unless otherwise explicitly indicated in the context, both singular and plural forms are intended, and it should be understood that when the terms “contain” and / or “include” are used herein, it means that features, processes, operations, devices, assemblies and / or combinations thereof exist.

[0045] Unless otherwise specifically stated, the relative arrangements, formulas, and numerical values ​​of the components and steps described in these embodiments do not limit the scope of this application. At the same time, for the sake of descriptive convenience, it should be understood that the dimensions of the parts shown in the drawings are not drawn according to actual proportional relationships. While we do not discuss in detail the art, methods, and equipment known to those skilled in the art, where appropriate, the art, methods, and equipment described should be considered part of the permitted specification. In all the examples shown and discussed herein, any specific values ​​are merely illustrative and should not be interpreted as limiting. Accordingly, other examples in the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar elements in subsequent drawings, and therefore, once an element is defined in one drawing, no further explanation of it is required in subsequent drawings.

[0046] In the description of this application, it should be understood that the orientations or positional relationships indicated by "front, back, up, down, left, right," "lateral, vertical, vertical, horizontal," and "top, bottom," etc., are generally based on the orientations or positional relationships shown in the attached drawings, and are merely for the convenience of easily describing and concisely describing this application. Unless otherwise stated, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation, or must be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of this application. The orientation terms "inside" and "outside" refer to the inside and outside of the contour of each component itself.

[0047] For convenience of description, spatially relative terms such as "on top of," "above," "on the top surface," and "on the top surface" may be used here to describe the spatial positional relationship between one illustrated device or feature and another device or feature. Spatially relative terms should be understood as intended to include different orientations of the device in use or operation, in addition to the orientation described in the drawing. For example, if the device in the drawing is reversed, a device described as "above another device or structure" or "on top of another device or structure" will subsequently be positioned as "below another device or structure" or "below another device or structure." Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here may be interpreted accordingly.

[0048] Furthermore, it should be explained that the use of words such as "first," "second," etc., to specify parts is simply to easily distinguish corresponding parts, and unless otherwise stated, the aforementioned words do not have any special meaning and should not be understood as limiting the scope of protection of this application.

[0049] The foregoing describes preferred embodiments of this application and is not intended to limit it. Those skilled in the art will know that this application is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the scope of the intent and principles of this application should be included within the scope of protection. [Explanation of Symbols]

[0050] 10 Valve body 101 Inlet 102 Confinement Room 1021 Distribution room 103 Drain 11 Main body 111 Mounting port 112 Insertion hole 12 End cover 20 valve cores 201 Flow channel structure 2011 Distribution aisle 2012 Flow hole 21. Segment 1 22. Segment 2 221 Main Segment 222 Blocked Segment 223 Connection Segments 30 Memory alloy springs 40 Return spring 50 Sealing member

Claims

1. A valve body (10) having sequentially arranged inlet (101), containment chamber (102), and drain outlet (103), wherein the inlet (101) and the drain outlet (103) are in communication with the containment chamber (102), and the valve body (10) A valve core (20) is provided, wherein the valve core (20) is movably arranged within the housing chamber (102) to open or close the drain port (103), and the valve core (20) is provided with a flow channel structure (201), and when the valve core (20) opens the drain port (103), the first end of the flow channel structure (201) is in communication with the inlet (101), the second end of the flow channel structure (201) is in communication with the drain port (103), and the inlet (101) is in communication with the drain port (103) via the flow channel structure (201), and the valve core (20) A memory alloy spring (30) and a return spring (40), both of which are arranged within the housing chamber (102), and each of the memory alloy spring (30) and the return spring (40) applies opposing forces to the valve core (20) in the axial direction of the valve body (10) such that the valve core (20) opens or closes the drain port (103), including, Drain valve.

2. The aforementioned accommodation room (102) includes an information room and a communication room that are in constant communication with each other. The valve core (20) includes a first segment (21) and a second segment (22) arranged in a stepped manner in the axial direction. The diameter of the first segment (21) is larger than the diameter of the second segment (22). The first segment (21) is guided and engaged with the guide chamber, The end of the second segment (22) that is away from the first segment (21) is used to close the drain opening (103), A flow chamber (1021) is provided between the communication chamber and the second segment (22). The second end of the flow channel structure (201) is in communication with the flow chamber (1021), When the valve core (20) opens the drain port (103), the flow chamber (1021) is in communication with the drain port (103). The drain valve according to claim 1.

3. The flow channel structure (201) includes interconnected flow passages (2011) and flow holes (2012), One end of the aforementioned flow passage (2011) extends to the end face of the valve core (20) adjacent to the inlet (101) and communicates with the inlet (101). The flow hole (2012) is provided in the side wall of the valve core (20) and penetrates the side wall of the valve core (20). The drain valve according to claim 2.

4. The aforementioned flow passage (2011) extends from the end of the valve core (20) adjacent to the inlet (101) to the second segment (22), The flow hole (2012) is provided in the side wall of the second segment (22). The drain valve according to claim 3.

5. The second segment (22) includes a main segment (221) and a closing segment (222) arranged in a stepped manner in the axial direction. The diameter of the main segment (221) is larger than the diameter of the closing segment (222). The main segment (221) is connected to the first segment (21), The flow hole (2012) is provided in the side wall of the main segment (221), The blocking segment (222) is inserted into the drain opening (103) so as to close the drain opening (103). The drain valve according to claim 4.

6. The second segment (22) further includes a connecting segment (223), The connecting segment (223) is located between the main segment (221) and the blocking segment (222). The diameter of the connecting segment (223) is smaller than the diameter of the drain opening (103). When the valve core (20) opens the drain port (103), the connecting segment (223) is inserted into the drain port (103). The main body segment (221) is located on one side of the drain outlet (103), The aforementioned blocking segment (222) is located on the other side of the drain opening (103), The drain valve according to claim 5.

7. The memory alloy spring (30) is located within the flow passage (2011) and is positioned at the end of the flow passage (2011) adjacent to the inlet (101). One end of the memory alloy spring (30) is in contact with the valve body (10), and the other end of the memory alloy spring (30) is in contact with the valve core (20). The drain valve according to claim 3.

8. The outer wall of the memory alloy spring (30) is guided and engaged with the inner wall of the flow passage (2011), and / or The return spring (40) is located within the communication chamber and fitted onto the outer circumference of the second segment (22), one end of the return spring (40) abuts against the valve body (10), the other end of the return spring (40) abuts against the valve core (20), and the outer wall of the return spring (40) is guided and engaged with the inner wall of the communication chamber. The drain valve according to claim 7.

9. A position regulating structure is provided between the valve body (10) and the valve core (20). The position regulating structure is used to limit the distance the valve core (20) moves from the drain outlet (103) towards the inlet (101). The drain valve according to claim 1.

10. The valve body (10) is The main body (11) has a mounting opening (111), a storage chamber (102), and a drain opening (103), and the mounting opening (111) and the drain opening (103) are located at both ends of the main body (11) in the axial direction of the main body (11), An end cover (12), wherein the end cover (12) is provided separately from the main body (11), the end cover (12) is attached to the mounting opening (111), and has an inlet (101), and the end cover (12) including, The drain valve according to claim 1.

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