Drain valve

Abstract

A drain valve comprising a valve body (10) including a sequentially connected first opening (101), a flow passage (102), and a second opening (103), wherein the flow passage (102) is for the flow of fluid, the first opening (101) and the second opening (103) are located on opposite sides of the flow passage (102), the first opening (101) and the second opening (103) are arranged opposite each other, and the first opening (101) is used to discharge fluid from the flow passage (102), and a valve core member (20), the first end of which is provided corresponding to the first opening (101), and the second end of which is provided corresponding to the second The valve core member (20) is provided corresponding to the opening (103) and is movable relative to the valve body (10), thereby opening and closing the first opening (101). The valve core member (20) has a first limit position and a second limit position which are positioned opposite each other. When the valve core member (20) is in the first limit position, the first end of the valve core member (20) closes the first opening (101) and the second end of the valve core member (20) closes the second opening (103). When the valve core member (20) is in the second limit position, the first end of the valve core member (20) opens the first opening (101). The drain valve can solve the problem that when the valve is opened, the differential pressure inside and outside the valve body (10) affects the smoothness of the opening of the valve core member (20).

Description

Technical Field

[0001] This application claims the priority of the patent application with the application number 202310542633.4 and the application title "Drain Valve", which was filed with the China National Intellectual Property Administration on May 11, 2023, This application claims the priority of the patent application with the application number 202321226668.9 and the application title "Drain Valve", which was filed with the China National Intellectual Property Administration on May 17, 2023, This application claims the priority of the patent application with the application number 202321160809.1 and the application title "Drain Valve", which was filed with the China National Intellectual Property Administration on May 11, 2023, This application claims the priority of the patent application with the application number 202310531300.1 and the application title "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 valves, specifically to drain valves.

Background Art

[0003] A drain valve is a valve used to discharge fluid from a pipeline. Usually, it is installed between two pipelines to discharge the fluid in both pipelines. The drain valve includes a valve body and a valve core member. The valve body includes a flow passage and a drain port that are interconnected. The drain port is arranged on the side of the flow passage. Both ends of the flow passage communicate with two externally connected pipelines respectively. The valve core member is movably arranged in the flow passage to close or open the drain port. In the prior art, the first end of the valve core member is used to close or open the drain port, and the second end of the valve core member is arranged in the flow passage. Due to the large difference between the pressure in the flow passage and the external pressure, with the above arrangement, when the valve core member closes the drain port, the valve core member receives a large differential pressure. Therefore, in the process of opening the valve core member, the valve core member needs to overcome the above differential pressure to operate, which affects the smoothness of valve opening.

Summary of the Invention

[0004] This application provides a drain valve that solves the problem in the prior art where the differential pressure inside and outside the valve affects the smoothness of opening the valve core when the valve core is opened. [Means for solving the problem]

[0005] This application provides a drain valve comprising a valve body including a sequentially connected first opening, a flow passage and a second opening, the flow passage being for the flow of fluid, the first and second openings being located on opposite sides of the flow passage, the first and second openings being positioned opposite each other, and the first opening being used to drain fluid from the flow passage; and a valve core member, the first end of which is provided corresponding to the first opening and the second end of which is provided corresponding to the second opening, and the valve core member being movable relative to the valve body, thereby opening and closing the first opening, wherein the valve core member has a first limit position and a second limit position positioned opposite each other, and when the valve core member is in the first limit position, the first end of the valve core member closes the first opening and the second end of the valve core member closes the second opening, and when the valve core member is in the second limit position, the first end of the valve core member opens the first opening.

[0006] Furthermore, if the cross-sectional area of ​​the first opening is S1 and the cross-sectional area of ​​the second opening is S2,

[0007]

number

[0008] Furthermore, when the valve core member is in the second limit position, the second end of the valve core member opens the second opening.

[0009] Furthermore, the drain valve further includes a first spring and a second spring, both provided within the valve body, and the first spring and the second spring apply opposing forces to the valve core member, causing the valve core member to move relative to the valve body.

[0010] Furthermore, the second spring and the first spring are fitted onto the valve core member at intervals along the axial direction of the valve core member, with the first end of the first spring in contact with the valve core member, the second end of the first spring in contact with the inner wall of the valve body, the first end of the second spring in contact with the inner wall of the valve body, and the second end of the second spring in contact with the valve core member.

[0011] Furthermore, the drain valve further includes a first axial position restricting structure provided between the valve core member and the first spring, which is used to restrict the movement of the first end of the first spring relative to the valve core member in a direction from the second opening toward the first opening, and a second axial position restricting structure provided between the valve body and the first spring, which is used to restrict the movement of the second end of the first spring relative to the valve body in a direction from the first opening toward the second opening.

[0012] Furthermore, the valve core member includes a first locking structure, the first end of the first spring is locked and engaged with the first locking structure, the first locking structure forms a first axial position restricting structure, a first mounting groove is provided on the inner wall of the valve body, the first mounting groove is located between the second opening and the flow passage, one end of the first mounting groove communicates with the second opening, the other end of the first mounting groove communicates with the flow passage, the cross-sectional area of ​​the first mounting groove is larger than the cross-sectional area of ​​the second opening, one end of the first spring away from the second spring is inserted into the first mounting groove and locked and engaged with the first mounting groove, the first mounting groove forms a second axial position restricting structure.

[0013] Furthermore, the drain valve includes a third axial position restricting structure provided between the valve body and the second spring, which is used to restrict the movement of the first end of the second spring relative to the valve body in the direction from the second opening toward the first opening, and a fourth axial position restricting structure provided between the valve core member and the second spring, which is used to restrict the movement of the second end of the second spring relative to the valve core member in the direction from the first opening toward the second opening.

[0014] Furthermore, a second mounting groove is provided on the inner wall of the valve body, the second mounting groove is positioned between the first opening and the flow passage, one end of the second mounting groove communicates with the first opening, the other end of the second mounting groove communicates with the flow passage, the cross-sectional area of ​​the second mounting groove is larger than the cross-sectional area of ​​the first opening, one end of the second spring away from the first spring is inserted into the second mounting groove and locked and engaged with the second mounting groove, the second mounting groove forms a third axial position restricting structure, the valve core member includes a second locking structure, one end of the second spring close to the first spring is locked and engaged with the second locking structure, the second locking structure forms a fourth axial position restricting structure.

[0015] Furthermore, when the valve core member is in the first limit position, the first end of the valve core member is inserted into the first opening to close the first opening, and when the valve core member switches from the first limit position to the second limit position, the valve core member moves along the direction from the first opening to the second opening, thereby opening the first opening. Alternatively, a first notch is provided on the outer circumferential surface of the first end of the valve core member, and when the valve core member is in the first limit position, the first end of the valve core member is inserted into the first opening to close the first opening, and the first notch is located on the side of the first opening that is close to the flow passage, and when the valve core member switches from the first limit position to the second limit position, the valve core member moves along the direction from the second opening to the first opening, and the first notch is located inside the first opening, and a first flow path for fluid flow is formed between the first opening and the first notch, and the first flow path communicates with the flow passage.

[0016] Furthermore, the valve body comprises a main body including a mounting opening, a flow passage, and a second opening, wherein the mounting opening is a main body communicating with the flow passage, and a valve seat provided separately from the main body is provided at the location of the mounting opening and has a first opening.

[0017] By applying the technical solution of this application, the influence of the pressure difference between the inside and outside of the valve body on the opening of the valve core member can be reduced, and the smoothness of the valve core member's opening process can be ensured. Specifically, in the drain valve of this solution, when the first opening and the second opening each communicate with the flow passage, and the first end of the valve core member closes the first opening and the second end of the valve core member closes the second opening, both the end face of the first end of the valve core member and the end face of the second end of the valve core member are placed under the same pressure environment. By installing it in this manner, the axial differential pressure of the valve core member can be reduced as much as possible, the differential pressure load on the valve core member can be reduced, the differential pressure that the valve core member overcomes in the process of opening the first opening can be reduced, and the smoothness of the valve core member's movement process can be ensured. In conventional solutions, one end of the valve core is completely submerged in the fluid inside the valve body, and the other end of the valve core closes the drain port. With this installation, one end of the valve core is under pressure in the flow passage, while the other end face is under pressure outside the valve body. As a result, the axial differential pressure experienced by the valve core is relatively large, and therefore, the smoothness of the valve core's movement during the valve opening process is greatly affected by the pressure difference between the inside and outside of the valve body. This increases the axial differential pressure that the valve core must overcome, affecting the smoothness of the valve opening. Compared to conventional solutions, the installation of this solution has a simpler structure, the axial differential pressure experienced by the valve core is relatively small, and the smoothness of the valve opening process is improved.

[0018] 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. The accompanying drawings are as follows: [Brief explanation of the drawing]

[0019] [Figure 1] A schematic diagram of the structure of a drain valve according to the first embodiment of this application is shown. [Figure 2] This diagram shows a schematic structure of the drain valve according to the first embodiment of this application when the valve core member is in the first limit position. [Figure 3]Schematic structural diagram when the valve core member of the drain valve according to the first embodiment of the present application is in the second limit position is shown. [Figure 4] Schematic structural diagram of the engagement of the valve core member, the first spring, and the second spring according to the first embodiment of the present application is shown. [Figure 5] Schematic partial structural diagram of the location A in FIG. 4 is shown. [Figure 6] Schematic structural diagram when the valve core member of the drain valve according to the second embodiment of the present application is in the first limit position is shown. [Figure 7] Schematic structural diagram when the valve core member of the drain valve according to the second embodiment of the present application is in the second limit position is shown. [Figure 8] Schematic structural diagram of the engagement of the valve core member, the first spring, and the second spring according to the second embodiment of the present application is shown. [Figure 9] Schematic structural diagram of the drain valve when the valve core member according to the third embodiment of the present application is in the first limit position is shown. [Figure 10] Cross-sectional view of the drain valve when the valve core member according to the third embodiment of the present application is in the first limit position is shown. [Figure 11] Cross-sectional view of the drain valve when the valve core member according to the third embodiment of the present application is in the second limit position is shown. [Figure 12] Schematic structural diagram of one type of valve core member according to the third embodiment of the present application is shown. [Figure 13] Schematic structural diagram of another valve core member according to the third embodiment of the present application is shown. [Figure 14] Schematic structural diagram of the engagement of the valve core member with the first spring and the second spring according to the third embodiment of the present application is shown. [[ID=3 =5]] [Figure 15] Schematic structural diagram of the drain valve according to the fourth embodiment of the present application is shown. [Figure 16] Schematic structural diagram when the valve core member according to the fourth embodiment of the present application is in the first limit position is shown. [Figure 17] Schematic structural diagram when the valve core member according to the fourth embodiment of the present application is in the second limit position is shown. [Figure 18] Schematic structural diagram when the valve core member according to the fifth embodiment of the present application is in the first limit position is shown. [Figure 19]This diagram shows a schematic structure of the fifth embodiment of this application when the valve core member is in the second limit position. [Figure 20] A schematic diagram of the structure of a drain valve according to the sixth embodiment of this application is shown. [Figure 21] A schematic diagram of the structure of the drain valve according to the sixth embodiment of this application when it is in the first limit position is shown. [Figure 22] A schematic diagram of the structure when the drain valve according to the sixth embodiment of this application is in the second limit position is shown. [Figure 23] A schematic diagram of the structure of the drain valve according to the seventh embodiment of this application when it is in the first limit position is shown. [Figure 24] This diagram shows a schematic structure of the drain valve according to the seventh embodiment of this application when it is in the second limit position. [Modes for carrying out the invention]

[0020] 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, not all of them. The following description, which is 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.

[0021] As shown in Figures 1 to 5, the first embodiment of the present application provides a drain valve including a valve body 10 and a valve core member 20. The valve body 10 includes a sequentially connected first opening 101, a flow passage 102 and a second opening 103, the flow passage 102 being for the flow of fluid, the first opening 101 and the second opening 103 being located on opposite sides of the flow passage 102, and the first opening 101 and the second opening 103 being positioned opposite each other. That is, in the present solution, the first opening 101 and the second opening 103 are spaced apart along the circumferential direction of the flow passage 102, and the first opening 101 and the second opening 103 are positioned coaxially, and the first opening 101 is used to discharge fluid from the flow passage 102. The first end of the valve core member 20 is provided corresponding to the first opening 101, and the second end of the valve core member 20 is provided corresponding to the second opening 103. The valve core member 20 is movable relative to the valve body 10, thereby opening and closing the first opening 101. The valve core member 20 has a first limit position and a second limit position which are positioned opposite each other. When the valve core member 20 is in the first limit position, the first end of the valve core member 20 closes the first opening 101 and the second end of the valve core member 20 closes the second opening 103. When the valve core member 20 is in the second limit position, the first end of the valve core member 20 opens the first opening 101.

[0022] By applying the technical solution of this application, the influence of the internal and external pressure difference of the valve body 10 on the opening of the valve core member 20 can be reduced, and the smoothness of the valve opening process of the valve core member 20 can be ensured. Specifically, in the drain valve of this solution, when the first opening 101 and the second opening 103 are in communication with the flow passage 102, the first end of the valve core member 20 closes the first opening 101, and the second end of the valve core member 20 closes the second opening 103, both the end face of the first end of the valve core member 20 and the end face of the second end of the valve core member 20 are placed in the same pressure environment. By installing it in this manner, the axial differential pressure of the valve core member 20 can be reduced as much as possible, the differential pressure load on the valve core member 20 can be reduced, the differential pressure that the valve core member 20 overcomes in the process of opening the first opening 101 can be reduced, and the smoothness of the movement process of the valve core member 20 can be ensured. In conventional solutions, one end of the valve core is completely submerged in the fluid inside the valve body, and the other end of the valve core closes the drain port. With this installation, one end of the valve core is under pressure in the flow passage, while the other end face is under pressure outside the valve body. The smoothness of the valve core's movement is greatly affected by the pressure difference between the inside and outside of the valve body. When the pressure difference between the inside and outside of the valve body is relatively large, the axial differential pressure experienced by the valve core becomes relatively large. Consequently, the axial differential pressure that the valve core must overcome during the valve opening process becomes large, affecting the smoothness of the valve opening. Compared to conventional solutions, the installation of this solution has a simple structure, the axial differential pressure experienced by the valve core 20 is relatively small, and the smoothness of the valve opening process is improved.

[0023] Furthermore, if the cross-sectional area of ​​the first opening 101 is S1 and the cross-sectional area of ​​the second opening 103 is S2,

[0024]

number

[0025] Specifically, the difference in cross-sectional area between the first opening 101 and the second opening 103 is within a certain range, and when the first end of the valve core member 20 closes the first opening 101 and the second end of the valve core member 20 closes the second opening 103, the axial differential pressure experienced by the first end and the second end of the valve core member 20 approaches equilibrium, resulting in virtually no differential pressure load. In other words, the differential pressure experienced by the first end and the differential pressure experienced by the second end of the valve core member 20 almost cancel each other out, and when opening the valve, the valve core member 20 hardly needs to overcome the differential pressure. The valve core member 20 only needs to overcome the frictional force between itself and the valve body 10, thereby ensuring the smooth operation of the valve core member 20. Furthermore, conventional technical solutions require designing the dimensions of the drain port within a predetermined range to ensure that the valve core member opens smoothly, taking into account the pressure difference between the inside and outside of the valve body. If this is not done, the pressure difference between the inside and outside of the valve body may become too large, potentially preventing the valve core member from opening the drain port. On the other hand, with the drain valve of this solution, there is no need to consider the pressure difference between the inside and outside of the valve body 10 when the valve core member 20 opens the first opening 101. Therefore, there is no need to consider the dimensions of the first opening 101. In other words, the drain valve of this solution can achieve high-flow discharge.

[0026]

number

[0027]

number

[0028]

number

[0029]

number

[0030] When the valve core member 20 is in the second limit position, the second end of the valve core member 20 may either open the second opening 103 or close the second opening 103. In this solution, no specific restrictions are placed on this, and the design should be tailored to the specific application of the drain valve.

[0031] In this embodiment, when the flow passage 102 is under negative pressure, the second end of the valve core member 20 opens the second opening 103 to equalize the air pressure between the flow passage 102 and the outside, ensuring smooth drainage by the drain valve. When the flow passage 102 is under positive pressure, the second end of the valve core member 20 opens the second opening 103 to discharge the fluid in the flow passage 102, further increasing the amount of fluid drained by the drain valve.

[0032] As shown in Figures 2 and 3, the drain valve further includes a first spring 30 and a second spring 40. Both the first spring 30 and the second spring 40 are located within the valve body 10, and the first spring 30 and the second spring 40 apply opposing forces to the valve core member 20 so as to move the valve core member 20 relative to the valve body 10, and one of the first spring 30 and the second spring 40 is a shape memory alloy spring.

[0033] In the embodiment of this application, the first spring 30 is a shape memory alloy spring, that is, the first spring 30 can sense changes in the fluid temperature inside the valve body 10, and when the fluid temperature inside the valve body 10 changes, the first spring 30 can expand or contract, when the first spring 30 expands, the second spring 40 is compressed, and when the first spring contracts, the second spring 40 expands. The first spring 30 and the second spring 40 work together to drive and move the valve core member 20. The installation of the first spring 30 and the second spring 40 has a simple structure, a long service life, and the first spring 30 senses the fluid temperature inside the valve body 10 relatively quickly, ensuring the sensitivity of the valve core member 20 in opening and closing the valve.

[0034] Furthermore, since the cross-sectional areas of the first opening 101 and the second opening 103 are almost equal, the valve core member 20 does not need to overcome differential pressure when opening the valve, thus ensuring a smooth valve opening process. As a result, even with a small biasing force from the first spring 30 and the second spring 40, the valve core member 20 can be driven to switch between the first limit position and the second limit position. Therefore, the spring force of the first spring 30 and the second spring 40 can be appropriately reduced, the difficulty of manufacturing the first spring 30 and the second spring 40 can be reduced, and the wire diameter of the first spring 30 and the second spring 40 can be reduced. Reducing the wire diameter of the first spring improves the sensitivity of the first spring 30, increases the response speed, and improves the valve opening accuracy of the valve core member 20.

[0035] Furthermore, when the cross-sectional areas of the first opening 101 and the second opening 103 are similar, the differential pressure that the valve core member 20 must overcome when opening the valve is not affected by the cross-sectional areas of the first opening 101 and the second opening 103. Therefore, the first spring 30 of the same specifications can be applied to drain valves with larger openings, improving the versatility of the first spring 30.

[0036] In another embodiment of this solution, the drain valve may include a thermostat and a second spring 40, both of which are located within the valve body 10. The thermostat is used to sense the temperature of the fluid within the valve body 10, and when the fluid temperature changes, the thermostat deforms and works in cooperation with the second spring to drive the valve core member 20 to move.

[0037] In this solution, the second spring 40 and the first spring 30 are fitted onto the valve core member 20 at intervals along the axial direction of the valve core member 20, with the first end of the first spring 30 in contact with the valve core member 20 and the second end of the first spring 30 in contact with the inner wall of the valve body 10, the first end of the second spring 40 in contact with the inner wall of the valve body 10 and the second end of the second spring 40 in contact with the valve core member 20. By installing them in this manner, the convenience of assembling the second spring 40 and the first spring 30 with the valve core member 20 can be ensured.

[0038] This solution does not impose any limitations on the specific positions of the second spring 40 and the first spring 30. The second spring 40 may be positioned close to the first opening 101 or close to the second opening 103. However, in this embodiment, the second spring 40 is positioned close to the first opening 101.

[0039] Furthermore, the drain valve includes a first axial position restricting structure and a second axial position restricting structure. The first axial position restricting structure is positioned between the valve core member 20 and the first spring 30 and is used to restrict the movement of the first end of the first spring 30 relative to the valve core member 20 along the direction from the second opening 103 toward the first opening 101. The second axial position restricting structure is positioned between the valve body 10 and the first spring 30 and is used to restrict the movement of the second end of the first spring 30 relative to the valve body 10 along the direction from the first opening 101 toward the second opening 103.

[0040] When assembling the first spring 30, the first spring 30 is fitted onto the valve core member 20 so that its first end engages with the first axial position restricting structure. Then, the valve core member 20 and the first spring 30 are assembled into the valve body 10 so that the second axial position restricting structure restricts the position of the second end of the first spring 30. This installation facilitates the assembly of the drain valve.

[0041] As shown in Figures 2 to 5, specifically, the valve core member 20 includes a first locking structure 201, the first end of the first spring 30 locks and engages with the first locking structure 201, and the first locking structure 201 forms a first axial position restricting structure. In this embodiment, the valve core member 20 includes a valve stem 21, a valve core body 22, and a locking portion 23, and two valve core bodies 22 are provided, the two valve core bodies 22 are respectively located at both ends of the valve stem 21, and the two valve core bodies 22 are provided corresponding to the first opening 101 and the second opening 103, respectively. The locking portion 23 is positioned on the outer circumferential surface of the valve stem 21, and in the axial direction of the valve stem 21, the locking portion 23 is located in the middle of the valve stem 21, and the locking portion 23 has a first locking surface and a second locking surface that are positioned opposite each other, the first spring 30 is fitted onto the valve stem 21 and is located on the side of the first locking surface away from the second locking surface, and the first locking surface locks and engages with the first end of the first spring 30.

[0042] This solution does not impose any restrictions on the specific shape and number of the locking portion 23, and multiple locking portions 23 can be provided at intervals in the circumferential direction of the valve stem 21. In this embodiment, one locking portion 23 is provided, and the locking portion 23 is provided in a ring shape on the outer circumference of the valve stem 21.

[0043] This solution does not impose any limitations on the specific method of connection between the locking portion 23 and the valve stem 21, and connection by snap-fit, welding, or fastener is possible. In this embodiment, the locking portion 23 is molded integrally with the valve stem 21.

[0044] Furthermore, a first mounting groove 104 is provided on the inner wall of the valve body 10. The first mounting groove 104 is located between the second opening 103 and the flow passage 102. One end of the first mounting groove 104 communicates with the second opening 103, and the other end communicates with the flow passage 102. The cross-sectional area of ​​the first mounting groove 104 is larger than the cross-sectional area of ​​the second opening 103. The end of the first spring 30 that is away from the second spring 40 is inserted into the first mounting groove 104 and engages with the first mounting groove 104, so that the first mounting groove 104 forms a second axial position regulating structure. In this embodiment, the first mounting groove 104 is arranged coaxially with the second opening 103, and the valve core member 20 is inserted into the first mounting groove 104. The installation of the first mounting groove 104 is simple in structure and easy to process.

[0045] Furthermore, the drain valve includes a third axial position restricting structure and a fourth axial position restricting structure. The third axial position restricting structure is positioned between the valve body 10 and the second spring 40 and is used to restrict the movement of the first end of the second spring 40 relative to the valve body 10 along the direction from the second opening 103 toward the first opening 101. The fourth axial position restricting structure is positioned between the valve core member 20 and the second spring 40 and is used to restrict the movement of the second end of the second spring 40 relative to the valve core member 20 along the direction from the first opening 101 toward the second opening 103. By installing them in this manner, the assembled valve core member 20, the first spring 30 and the second spring 40 can be easily incorporated into the valve body 10.

[0046] Specifically, after assembling the first spring 30 and the valve core member 20, the second spring 40 is fitted onto the valve core member 20 so that the second end of the second spring 40 engages with the fourth axial position restricting structure. Next, the assembled valve core member 20, the first spring 30, and the second spring 40 are incorporated into the valve body 10, ensuring that the third axial position restricting structure engages with the first end of the second spring 40, and that the second axial position restricting structure restricts the position of the second end of the first spring 30.

[0047] The valve core member 20 includes a second locking structure 202, and one end of the second spring 40 adjacent to the first spring 30 locks and engages with the second locking structure 202, and the second locking structure 202 forms a fourth axial position restricting structure.

[0048] In this embodiment, the second locking surface of the locking portion 23 forms the second locking structure 202, and the second spring 40 is fitted onto the valve stem 21 and is located on the side of the second locking surface away from the first locking surface. By installing it in this way, the axial dimension of the valve core member 20 can be made as small as possible, ensuring miniaturization of the drain valve. Furthermore, the above installation makes it easier to process and mold the valve core member 20.

[0049] This solution does not impose any limitations on the specific position of the locking portion 23 on the valve stem 21, and can be installed according to the actual situation.

[0050] Furthermore, a second mounting groove 105 is provided on the inner wall of the valve body 10. The second mounting groove 105 is positioned between the first opening 101 and the flow passage 102. One end of the second mounting groove 105 communicates with the first opening 101, and the other end communicates with the flow passage 102. The cross-sectional area of ​​the second mounting groove 105 is larger than the cross-sectional area of ​​the first opening 101. The end of the second spring 40 that is away from the first spring 30 is inserted into the second mounting groove 105 and engages with the second mounting groove 105, so that the second mounting groove 105 forms a third axial position restricting structure.

[0051] In this embodiment, the second mounting groove 105 is arranged coaxially with the first opening 101, and the valve core member 20 is inserted into the second mounting groove 105. The installation of the second mounting groove 105 is simple in structure and easy to manufacture.

[0052] In this embodiment, there are no restrictions on the depth of the first mounting groove 104 and the second mounting groove 105. In this embodiment, the depth of the second mounting groove 105 is greater than the depth of the first mounting groove 104, and at least half the length of the first spring 30 is located within the flow passage 102. By installing it in this way, it is possible to ensure that the first spring 30 is located within the flow passage 102 with sufficient length, to ensure the sensing speed of the first spring 30 with respect to fluid temperature, to ensure the sensitivity of the first spring 30, and to ensure the driving accuracy with respect to the valve core member 20.

[0053] In this embodiment, when the valve core member 20 is in the first limit position, the first end of the valve core member 20 is inserted into the first opening 101, closing the first opening 101. When the valve core member 20 switches from the first limit position to the second limit position, the valve core member 20 moves along the direction from the first opening 101 to the second opening 103 so as to open the first opening 101. Specifically, a first spring 30 that expands and contracts with heat and cold is used, and the water temperature for valve opening is set to 0-3°C. When the water temperature drops to this temperature range, the first spring 30 contracts, the spring force of the second spring 40 becomes greater than the spring force of the first spring 30, and the valve core member 20 moves along the direction from the first opening 101 to the second opening 103, thereby opening the valve. When the water temperature exceeds 3-5°C, the first spring 30 stretches, and the spring force of the first spring 30 becomes greater than the spring force of the second spring 40, causing the valve core member 20 to move along the direction from the second opening 103 toward the first opening 101, thereby closing the valve.

[0054] Furthermore, a second notch 204 is provided on the outer circumferential surface of the second end of the valve core member 20. When the valve core member 20 is in the first limit position, the second end of the valve core member 20 is inserted into the second opening 103, closing the second opening 103, and the second notch 204 is located within the first mounting groove 104. When the valve core member 20 switches from the first limit position to the second limit position, at least a portion of the second notch 204 is located within the second opening 103, forming a second flow path for fluid circulation between the second opening 103 and the second notch 204. The second flow path is connected to the circulation passage 102 via the first mounting groove 104 to discharge the fluid in the circulation passage 102.

[0055] This embodiment does not impose any limitations on the specific form or shape of the second notch 204, and multiple second notches 204 can be provided at intervals in the circumferential direction of the valve core member 20. In this embodiment, one second notch 204 is provided, and the second notch 204 is arranged in a ring shape on the outer circumferential surface of the valve core member 20 along the circumferential direction of the valve core member 20, and both ends of the second opening 103 are chamfered, and the distance between the side walls of the second notch 204, which are positioned opposite each other along the axial direction, gradually increases along the direction from the center toward the edge so that the second notch 204 coincides with the second opening 103, and by installing it in this way, the flow of fluid can be facilitated.

[0056] Specifically, the valve body 10 includes a main body 11 and a valve seat 12. The main body 11 has a mounting opening 1101, a flow passage 102, and a second opening 103, with the mounting opening 1101 communicating with the flow passage 102. The valve seat 12 is provided separately from the main body 11, and the valve seat 12 is located at the mounting opening 1101, and the valve seat 12 has a first opening 101. In this embodiment, the valve seat 12 is screwed into the mounting opening 1101, and by installing it in this manner, the assembly of the main body 11 and the valve seat 12 can be facilitated.

[0057] Specifically, the main body 11 includes a first projection 111 and a second projection 112. The first projection 111 and the second projection 112 are spaced apart along the circumferential direction of the main body 11, the extending direction of the first projection 111 coincides with the radial direction of the main body 11, and the first projection 111 and the second projection 112 are coaxially arranged. A mounting opening 1101 is provided on the first projection 111, and a second opening 103 is provided on the second projection 112. By installing them in this manner, the radial dimensions of the valve body 10 can be reduced.

[0058] As shown in Figures 6 to 8, the second embodiment of this application provides a drain valve, which differs from the first embodiment in the following ways.

[0059] The outer circumferential surface of the second end of the valve core member 20 does not have a second notch 204, and the outer circumferential surface of the first end of the valve core member 20 has a first notch 203. When the valve core member 20 is in the first limit position, the first end of the valve core member 20 is inserted into the first opening 101 and closes the first opening 101, at least a part of the first notch 203 is located on the side of the first opening 101 that is close to the flow passage 102, and the second end of the valve core member 20 is inserted into the second opening 103, and the valve core member 20 is in the first limit position. When the valve switches to the second limit position, the valve core member 20 moves along the direction from the second opening 103 toward the first opening 101, the first notch 203 is located within the first opening 101, a first flow path for fluid flow is formed between the first opening 101 and the first notch 203, the first flow path is in communication with the flow passage 102 via the second mounting groove 105, the second end of the valve core member 20 is separated from the second opening 103, and the second opening 103 is in communication with the flow passage 102 via the first mounting groove 104. Specifically, a first spring that expands and contracts with heat and cold is used, and the water temperature for valve opening is set to 0-3°C. When the water temperature drops to this temperature range, the first spring 30 expands, and the spring force of the second spring 40 becomes smaller than that of the first spring 30, causing the valve core member 20 to move along the direction from the second opening 103 towards the first opening 101, thereby opening the valve. When the water temperature exceeds 3-5°C, the first spring 30 contracts, and the spring force of the first spring 30 becomes smaller than that of the second spring 40, causing the valve core member 20 to move along the direction from the first opening 101 towards the second opening 103, thereby closing the valve.

[0060] This embodiment does not impose any limitations on the specific form or shape of the first notch 203, and multiple first notches 203 can be provided at intervals in the circumferential direction of the valve core member 20. In this embodiment, one first notch 203 is provided, and the first notch 203 is provided in a ring shape on the outer circumferential surface of the valve core member 20 along the circumferential direction of the valve core member 20, and both ends of the first opening 101 are chamfered, and the distance between the side walls of the first notch 203 that are positioned opposite each other along the axial direction gradually increases in the direction from the center toward the edge so that the first notch 203 coincides with the first opening 101, and by installing it in this way, the flow of fluid can be facilitated.

[0061] As shown in Figures 9 to 11, a third embodiment of the present application provides a drain valve including a valve body 10, a valve core member 20, and a first spring 30. The valve body 10 includes a sequentially connected first opening 101, a flow passage 102, and a second opening 103, the flow passage 102 being for the flow of fluid, the second opening 103 and the first opening 101 being located on opposite sides of the flow passage 102, the second opening 103 and the first opening 101 being opposite each other, that is, in this solution, the second opening 103 and the first opening 101 are spaced apart along the circumferential direction of the flow passage 102, and the second opening 103 and the first opening 101 are coaxially arranged, and the second opening 103 is used to discharge fluid in the flow passage 102. The second end of the valve core member 20 is provided corresponding to the second opening 103, and the first end of the valve core member 20 is provided corresponding to the first opening 101. The valve core member 20 is movable relative to the valve body 10, thereby opening and closing the second opening 103.

[0062] The valve core member 20 has a first limit position and a second limit position that are positioned opposite to each other. When the valve core member 20 is in the first limit position, the second end of the valve core member 20 closes the second opening 103 and the first end of the valve core member 20 closes the first opening 101. When the valve core member 20 is in the second limit position, the first end of the valve core member 20 opens the first opening 101 and the second end of the valve core member 20 opens the second opening 103.

[0063] Specifically, the second opening 103 includes sequentially connected mounting segment 1031 and closing segment 1032, the mounting segment 1031 being located on the side of the closing segment 1032 adjacent to the flow passage 102, and the diameter of the mounting segment 1031 being smaller than the diameter of the closing segment 1032. The second end of the valve core member 20 can close or open the closing segment 1032, the first spring 30 is fitted onto the valve core member 20 and is used to apply a force to the valve core member 20 to close or open the closing segment 1032, the first end of the first spring 30 is connected to the valve core member 20 and the second end of the first spring 30 is located inside the mounting segment 1031.

[0064] By applying the technical solution of this application, the diameter of the mounting segment 1031 is smaller than the diameter of the closing segment 1032, the second end of the valve core member 20 closes or opens the closing segment 1032, the mounting segment 1031 is used to accommodate the end of the first spring 30, and the diameter of the mounting segment 1031 is smaller than the diameter of the closing segment 1032. By installing it in this way, the dimensions of the first spring 30 are not limited by the diameter of the closing segment 1032, but only need to be adapted to the diameter of the mounting segment 1031. This minimizes the dimensions of the diameter of the first spring 30 and the valve body 10, thereby reducing the cost of the drain valve.

[0065] Specifically, when using a drain valve, it needs to be assembled between two pipelines. When the valve core member 20 opens the second opening 103, the fluid in the flow passage 102 flows through the mounting segment 1031 to the closing segment 1032 and is discharged from the drain valve. In conventional technical solutions, the valve body is provided with an opening and an assembly groove for accommodating the end of a spring. The valve core member is used to close or open the opening, and the assembly groove communicates with the opening in a stepped manner, with the diameter of the assembly groove being larger than the diameter of the opening. If the dimensions of the opening are relatively large, the dimensions of the assembly groove must be increased accordingly to form a stepped surface with the opening, and the end of the spring must be brought into contact with and engaged with the stepped surface. However, the above installation increases the dimensions of the valve body and the spring, increasing the cost of the drain valve.

[0066] Compared to conventional technical solutions, this solution provides the second opening 103 in the form of a mounting segment 1031 and a closing segment 1032 that are in communication with each other. The valve core member 20 closes or opens the closing segment 1032, and the mounting segment 1031 is used to accommodate the end of the first spring 30. The diameter of the mounting segment 1031 is made smaller than the diameter of the closing segment 1032. By installing it in this way, the diameter of the mounting segment 1031 can be reduced as long as the end of the first spring 30 is fitted inside the mounting segment 1031.

[0067] In other words, with the configuration of this solution, the diameter of the first spring 30 is not limited by the dimensions of the blocking segment 1032, and even if the diameter of the blocking segment 1032 is large, the radial dimension of the first spring 30 can be reduced, the dimensions of the valve body 10 can be reduced, and the cost of the drain valve can be reduced.

[0068] As shown in Figures 10 and 11, specifically, the drain valve further includes a position restricting portion 1033, which is located within the second opening 103 and between the closing segment 1032 and the mounting segment 1031, and the end face of the second end of the first spring 30 is in contact with and engaged with the side of the position restricting portion 1033 away from the closing segment 1032.

[0069] In this embodiment, the mounting segment 1031, the position regulating section 1033, and the closing segment 1032 are arranged sequentially along the axial direction of the second opening 103. Specifically, the position regulating section 1033 divides the second opening 103 into the mounting segment 1031 and the closing segment 1032, which are spaced apart from each other and communicate with one another, so that the diameter of the closing segment 1032 is larger than the diameter of the mounting segment 1031. The end face of the second end of the first spring 30 abuts against the side of the position regulating section 1033 that is away from the closing segment 1032. By installing it in this manner, the stability of the first spring 30 can be ensured.

[0070] This solution does not impose any restrictions on the specific number of position restricting sections 1033, and multiple position restricting sections 1033 may be provided. However, if multiple position restricting sections 1033 are provided, they are provided on the side walls of the first opening at intervals along the circumferential direction of the first opening. There is a gap between the inner wall of the position restricting section 1033 and the side wall of the valve core member 20, and a gap for fluid flow is formed between two adjacent position restricting sections 1033. By installing them in this manner, smooth fluid flow can be ensured.

[0071] In this embodiment, the position regulating section 1033 and the valve body 10 are integrally molded. By installing them in this manner, the stability of the connection between the position regulating section 1033 and the valve body 10 can be ensured, and the convenience of processing can be ensured.

[0072] In this embodiment, the position restricting portion 1033 is arranged in a ring shape along the circumferential direction of the second opening 103 on the side wall of the second opening 103, and a flow path for fluid circulation is formed between the inner wall of the position restricting portion 1033 and the side wall of the valve core member 20. By installing it in this manner, the convenience of manufacturing the position restricting portion 1033 and the valve body 10 can be further ensured, the contact area of ​​the position restricting portion 1033 with the first spring 30 can be secured, and the stability of the first spring 30 can be ensured.

[0073] Furthermore, the valve core member 20 includes a position restricting structure 205, which is used to restrict the movement of the valve core member 20 by engaging with the position restricting portion 1033. By setting the position restricting structure 205, it is possible to avoid situations where the valve core member 20 is over-open or over-closed, and to ensure the accuracy of opening or closing the valve.

[0074] In this embodiment, the valve core member 20 is provided with a stepped structure, which is located on the side of the position restricting portion 1033 away from the mounting segment 1031. The stepped structure is used to abut and engage with the side of the position restricting portion 1033 away from the mounting segment 1031, and a position restricting structure 205 is formed on the stepped structure. The installation of the stepped structure is simple and easy to implement.

[0075] As shown in Figures 10 to 14, specifically, the valve core member 20 includes a valve stem 21 and a valve core body 22 arranged sequentially along the direction from the mounting segment 1031 to the closing segment 1032. The cross-sectional area of ​​the valve core body 22 is larger than that of the valve stem 21. The first spring 30 is fitted onto the valve stem 21, one end of the valve stem 21 is inserted into the mounting segment 1031, and the valve core body 22 is used to close or open the closing segment 1032. A stepped structure is formed between the valve core body 22 and the valve stem 21.

[0076] This solution does not impose any limitations on the specific connection method between the valve core body 22 and the valve stem 21. The valve core body 22 and the valve stem 21 may be provided as an integrally molded structure or as separate structures.

[0077] In this embodiment, the valve core body 22 and the valve stem 21 are provided as separate structures. By installing them in this manner, the manufacturing of the valve core body 22 and the valve stem 21 is made easier, and assembly with the first spring 30 is made easier.

[0078] In this embodiment, the valve stem 21 includes a main segment 211 and a connecting segment 212 connected in a stepped manner along the axial direction, the diameter of the connecting segment 212 being smaller than the diameter of the main segment 211, and the valve core body 22 being provided with a connecting hole, the connecting hole being positioned to penetrate the valve core body 22 along the axial direction of the valve core body 22, the connecting segment 212 being inserted into the connecting hole, and the stepped surface between the connecting segment 212 and the main segment 211 being locked and engaged with the end face of the valve core body 22.

[0079] As shown in Figures 12 and 13, in this solution, the valve core body 22 and the valve stem 21 may be welded or riveted together. When the valve core body 22 and the valve stem 21 are riveted together, a clearance groove is provided on the end face of one end of the connecting segment 212 away from the main segment 211, and the connecting segment 212 at the position corresponding to the clearance groove is bent outward and installed by riveting it to the end face of the valve core body 22.

[0080] As shown in Figures 10, 11, and 14, the first spring 30 further includes a first guide segment 31 and a second guide segment 32 arranged sequentially along the direction from the mounting segment 1031 toward the closing segment 1032, wherein the diameter of the second guide segment 32 is larger than the diameter of the first guide segment 31, the second guide segment 32 is located within the mounting segment 1031, and the outer wall of the second guide segment 32 is guide-engaged with the mounting segment 1031, and the first guide segment 31 and the valve core member 20 are gap-fitted. By installing it in this way, the stability of the first spring 30 is further ensured, bending and tilting of the first spring 30 during the expansion and contraction process is avoided, the stability and uniformity of the force applied to the valve core member 20 is ensured, and the stability of the movement of the valve core member 20 can be ensured. In addition, in this solution, the first spring 30 is configured in a tower structure, thereby avoiding the need for additional positioning members.

[0081] Furthermore, the drain valve further includes a second spring 40, which is fitted onto the valve core member 20, with its first end connected to the valve body 10 and its second end connected to the valve core member 20. The second spring 40 and the first spring 30 exert opposing forces on the valve core member 20, and the two springs cooperate to drive the valve core member 20 to move. One of the two springs, the second spring 40 and the first spring 30, is a shape memory alloy spring. The installation of the shape memory alloy spring is structurally simple and allows for direct contact with the fluid in the flow passage 102, thus ensuring sensitivity when driving the valve core member 20.

[0082] In this embodiment, the valve core member 20 further includes a locking portion 23, which is arranged in a ring shape on the side wall of the valve stem 21 along the circumferential direction of the valve stem 21. The first spring 30 and the second spring 40 are located on either side of the locking portion 23, with one end of the first spring 30 adjacent to the second spring 40 abutting against one side of the locking portion 23, and the other end of the second spring 40 adjacent to the first spring 30 abutting against the other side of the locking portion 23. This arrangement ensures the convenience of assembling the first spring 30 and the second spring 40. In this embodiment, the first spring 30 is a shape memory alloy spring.

[0083] This solution does not impose any limitations on the specific positions of the first spring 30 and the second spring 40. The first spring 30 may be positioned corresponding to the second opening 103, and the second spring 40 may be positioned corresponding to the second opening 103. However, in this embodiment, the first spring 30 is provided corresponding to the second opening 103.

[0084] In this embodiment, the maximum diameter of the first spring 30 is different from the maximum diameter of the second spring 40. By installing them in this manner, the first spring 30 and the second spring 40 can be easily distinguished, and the possibility of them being installed incorrectly is avoided.

[0085] In this embodiment of the solution, when the valve core member 20 is in the first limit position, the first end of the valve core member 20 closes the first opening 101, the second end of the valve core member 20 closes the closing segment 1032, and the stepped structure of the valve core member 20 abuts and engages with the side of the position restricting portion 1033 away from the mounting segment 1031, thereby limiting the movement of the valve core member 20 and preventing over-closing of the valve core member 20. When the valve core member 20 is in the second limit position, the closing segment 1032 is in an open state, and the first opening 101 is in an open state.

[0086] In this solution, when the drain valve's flow passage 102 is under positive pressure, the second opening 103 and the first opening 101 function simultaneously as drain ports, ensuring the drainage volume and speed of the drain valve. When the flow passage 102 is under negative pressure, one of the second opening 103 and the first opening 101 functions as a drain port, and the other can be used as an air intake. By installing it in this manner, communication between the flow passage 102 and the outside can be ensured, and the drainage effect of the drain valve is maintained.

[0087] In this embodiment, the first opening 101 is used as a drain port and the second opening 103 is used as an intake port. When the first opening 101 drains, the second opening 103 draws in air, and even if the cross-sectional area of ​​the intake passage is smaller than the cross-sectional area of ​​the drain passage, the required intake velocity can be met.

[0088] In this embodiment, the cross-sectional area of ​​the first opening 101 is the same as the cross-sectional area of ​​the closing segment 1032, the valve core member 20 includes two valve core bodies 22, the two valve core bodies 22 are symmetrically arranged at the ends of the valve stem 21, and both valve core bodies 22 are constructed separately from the valve stem 21. However, one valve core body 22 may be integrally molded with the valve stem 21, and the other valve core body 22 may be constructed separately from the valve stem 21. The cross-sectional area of ​​the first opening 101 is the same as the cross-sectional area of ​​the closing segment 1032, and by installing it in this manner, when the second opening 103 is closed and the first opening 101 is closed, the valve core member 20 can maintain internal balance and ensure smooth valve opening.

[0089] As shown in Figures 10, 11, and 14, the valve body 10 is further provided with a second mounting groove 105, which is located between the flow passage 102 and the first opening 101, the diameter of which is larger than the diameter of the first opening 101, the first end of the second spring 40 is located within the second mounting groove 105, and the outer wall of the first end of the second spring 40 is guided and engaged with the second mounting groove 105. In this embodiment, the second mounting groove 105 communicates with the first opening 101 in a stepped manner, and the installation of the second mounting groove 105 can further ensure the stability of the second spring 40.

[0090] In this embodiment, the second spring 40 includes sequentially arranged third guide segments 41 and fourth guide segments 42, the diameter of the third guide segment 41 being larger than the diameter of the fourth guide segment 42, the diameter of the third guide segment 41 being larger than the diameter of the second guide segment 32 of the first spring 30, the outer wall of the third guide segment 41 being guide-engaged with the second mounting groove 105, the fourth guide segment 42 being clearance-fitted with the valve stem 21, and one end of the fourth guide segment 42 away from the third guide segment 41 being lock-engaged with the side of the locking portion 23 away from the first spring 30. By installing it in this way, the stability of the second spring 40 can be further ensured, bending and tilting of the second spring 40 during the expansion and contraction process can be avoided or reduced, the stability and uniformity of the force applied to the valve core member 20 by the second spring 40 can be ensured, and the stability of the movement of the valve core member 20 can be ensured.

[0091] As shown in Figures 9 to 11, the valve body 10 further includes a main body 11 and a valve seat 12, with the flow passage 102 and the second opening 103 both provided in the main body 11, and the main body 11 further provided with a mounting opening 1101, which is located on the side of the flow passage 102 and is positioned opposite the second opening 103, and the first opening 101 and the second mounting groove 105 both provided in the valve seat 12, which is installed at the location of the mounting opening 1101 and screwed into the main body 11. By installing it in this manner, convenience in assembling the drain valve can be ensured.

[0092] By applying the technical solution of this application, the diameter of the mounting segment 1031 is smaller than the diameter of the closing segment 1032, the second end of the valve core member 20 closes or opens the closing segment 1032, the mounting segment 1031 is used to accommodate the end of the first spring 30, and the diameter of the mounting segment 1031 is smaller than the diameter of the closing segment 1032. By installing it in this way, the dimensions of the first spring 30 are not limited by the diameter of the closing segment 1032, but only need to be adapted to the diameter of the mounting segment 1031, thereby minimizing the dimensions of the diameter of the first spring 30 and the valve body 10, and reducing the cost of the drain valve.

[0093] Configuring the valve core member 20 as a separate valve stem 21 and valve core body 22 makes it easier to assemble the valve core member 20 with the first spring 30 and the second spring 40. The maximum diameter of the first spring 30 is different from the maximum diameter of the second spring 40, and by installing them in this way, the first spring 30 and the second spring 40 can be easily distinguished, preventing them from being installed in reverse.

[0094] As shown in Figures 15 to 17, a fourth embodiment of the present application provides a drain valve comprising a valve body 10, a valve core member 20, and a first spring 30. The valve body 10 comprises a first opening 101 and a flow passage 102 which are interconnected, the flow passage 102 being for the flow of fluid, the first opening 101 being located on the side of the flow passage 102 and used to discharge fluid from the flow passage 102. The valve core member 20 is movable relative to the valve body 10, and the first end of the valve core member 20 is used to open or close the first opening 101. The first spring 30 is installed inside the valve body 10 and is a shape memory alloy spring. The first spring 30 is driven and connected to the valve core member 20 and is configured to open or close the first opening 101 by the valve core member 20. When the valve core member 20 closes the first opening 101, at least half the length of the first spring 30 is located inside the flow passage 102 in the direction of expansion and contraction of the first spring 30.

[0095] By applying the technical solution of this application, by positioning at least half the length of the first spring 30 in the flow passage 102, it is possible to ensure that at least half the length of the first spring 30 is immersed in the flowing fluid when the drain valve is operated. This allows the first spring 30 to sense the temperature of the fluid more accurately, ensures the sensing speed of the first spring 30, ensures the accuracy of the movement drive of the valve core member 20 by the first spring 30, and ensures the accuracy of valve opening.

[0096] Specifically, when the drain valve is operated, it is installed between two water pipes, and the fluid fills the entire flow passage 102. At least half the length of the first spring 30 is immersed in the flowing fluid, and the first spring 30 can directly sense the temperature change of the fluid. This avoids the influence of ambient temperature on the temperature sensed by the first spring 30, enabling more precise valve opening and reducing or avoiding the occurrence of unexpected drainage. In conventional technical solutions, the temperature sensing element is installed at the drain outlet and is either not inserted into the flow passage or the length inserted into the flow passage is too short. As a result, the temperature sensing element mainly senses the temperature at the drain outlet, and if there is a relatively large difference between the ambient temperature and the temperature inside the drain valve, a temperature difference always exists between the temperature at the drain outlet and the temperature inside the flow passage. Consequently, the sensing accuracy of the temperature sensing element for the fluid inside the flow passage is low, resulting in low valve opening accuracy. Compared to conventional technical solutions, this solution ensures that at least half the length of the first spring 30 is placed within the flow passage 102, and when the fluid fills the entire flow passage 102, at least half the length of the first spring 30 is immersed in the flowing fluid. By installing it in this way, the temperature of most of the first spring 30 can be closely matched with the temperature of the fluid in the flow passage 102. This reduces the influence of ambient temperature on the temperature of the first spring 30, ensures the sensing speed of the first spring 30 in relation to the temperature of the fluid in the flow passage 102, improves the driving speed and accuracy of the first spring 30 relative to the valve core member 20, and ensures the speed and accuracy when opening the valve.

[0097] As shown in Figures 16 and 17, the valve body 10 further includes a second opening 103 which communicates with the flow passage 102 and is provided opposite to the first opening 101. The valve core member 20 has a first limit position and a second limit position provided opposite to each other. When the valve core member 20 is in the first limit position, the first end of the valve core member 20 closes the first opening 101 and the second end of the valve core member 20 closes the second opening 103. When the valve core member 20 is in the second limit position, the first opening 101 is open and the second opening 103 is open. When the inside of the flow passage 102 is under negative pressure, the second opening 103 can be used as an air intake. With this arrangement, the flow passage 102 communicates with the outside gas through the second opening 103, balancing the air pressure between the flow passage 102 and the outside, and ensuring smooth fluid discharge. When the flow passage 102 is under positive pressure, the second opening 103 can be used as a drain port. With this arrangement, the amount of fluid discharged can be increased, and smooth fluid discharge can be ensured.

[0098] Furthermore, the drain valve further includes a second spring 40, which is located inside the valve body 10. The second spring 40 is driven and connected to the valve core member 20. The second spring 40 and the first spring 30 apply a reverse force to the valve core member 20, and the first spring 30 and the second spring 40 cooperate to drive and move the valve core member 20. The drain valve of this solution can sense the temperature of the fluid in the pipeline, and when the fluid temperature changes to a predetermined range, it opens the first opening 101 and the second opening 103.

[0099] Specifically, the first spring 30 can sense changes in the fluid temperature inside the valve body 10. When the fluid temperature inside the valve body 10 changes, the first spring 30 can extend or contract. When the first spring 30 extends, the second spring 40 is compressed, and when the first spring 30 contracts, the second spring 40 extends. The first spring 30 and the second spring 40 work together to drive and move the valve core member 20. The installation of the first spring 30 and the second spring 40 results in a simple structure, a long service life, and a relatively fast sensing speed of the first spring 30 for fluid temperature inside the valve body 10, ensuring the sensitivity of the valve core member 20 in opening and closing the valve.

[0100] As shown in Figures 16 and 17, the first spring 30 and the second spring 40 are further fitted onto the valve core member 20 at intervals along the axial direction of the valve core member 20, with the first end of the first spring 30 in contact with the valve core member 20, the second end of the first spring 30 in contact with the valve body 10, the first end of the second spring 40 in contact with the valve body 10, and the second end of the second spring 40 in contact with the valve core member 20. By installing them in this manner, the convenience of assembling the second spring 40 and the first spring 30 with the valve core member 20 can be ensured. This solution does not impose any limitations on the specific positions of the second spring 40 and the first spring 30, and the second spring 40 may be positioned close to the first opening 101 or close to the second opening 103, but in this embodiment, the second spring 40 is positioned close to the first opening 101.

[0101] Furthermore, the valve body 10 further includes a first mounting groove 104, which is provided on the inner wall of the valve body 10. The first mounting groove 104 communicates with the flow passage 102, and the second end of the first spring 30 is fitted into the first mounting groove 104 and locked into the first mounting groove 104. The installation of the first mounting groove 104 serves to restrict the position and lock the first spring 30, thereby ensuring the stability of the first spring 30.

[0102] This solution does not impose any restrictions on the specific shape of the first mounting groove 104, and it is possible to install the first mounting groove 104 in a ring shape and to install it in a ring shape on the outside of the second opening 103. In this embodiment, the first mounting groove 104 is located on the side of the second opening 103 that is close to the flow passage 102, the cross-section of the first mounting groove 104 is circular, the first mounting groove 104 and the second opening 103 are arranged coaxially, and the diameter of the first mounting groove 104 is larger than the diameter of the second opening 103, that is, the valve core member 20 is inserted into the first mounting groove 104. By installing it in this way, the convenience of processing the first mounting groove 104 can be ensured and the convenience of assembling the first spring 30 can be ensured.

[0103] Specifically, the extending direction of the first mounting groove 104 coincides with the radial direction of the flow passage 102, and the radius R of the flow passage 102 is greater than the depth d of the first mounting groove 104. When the valve core member 20 closes the first opening 101, the length of the first end of the first spring 30 protruding from the first mounting groove 104 along the radial direction of the flow passage 102 is greater than the radius of the flow passage 102. By installing it in this way, at least half the length of the first spring 30 is located within the flow passage 102 and can be immersed in the fluid of the flow passage 102.

[0104] As shown in Figures 16 and 17, the valve body 10 further includes a second mounting groove 105, which is provided on the inner wall of the valve body 10 and communicates with the flow passage 102. The first end of the second spring 40 is fitted into the second mounting groove 105 and locked into the second mounting groove 105. The installation of the second mounting groove 105 serves to restrict the position of the first end of the second spring 40 and to lock it in place, thereby ensuring the stability of the second spring 40.

[0105] This solution does not impose any restrictions on the specific structure of the second mounting groove 105, and allows the second mounting groove 105 to be installed in a ring shape and also installed in a ring shape around the outer circumference of the first opening 101.

[0106] As shown in Figures 15 to 17, in this embodiment, the valve body 10 includes a main body 11 and a valve seat 12. The main body 11 has a second opening 103, a first mounting groove 104, a mounting opening 1101 and a flow passage 102. The mounting opening 1101 communicates with the flow passage 102, and both the mounting opening 1101 and the first mounting groove 104 are located on the side of the flow passage 102. The first mounting groove 104 and the mounting opening 1101 are positioned opposite each other, and the first mounting groove 104 and the mounting opening 1101 are coaxial, and the axial direction of the first mounting groove 104 coincides with the radial direction of the flow passage 102. The second opening 103 is located on the side of the first mounting groove 104 away from the flow passage 102. The valve seat 12 is provided separately from the main body 11, and the valve seat 12 is located at the mounting opening 1101, with the first opening 101 located on the valve seat 12.

[0107] Furthermore, the main body 11 includes a first projection 111 and a second projection 112, which are spaced apart along the circumferential direction of the main body 11, both of which protrude outward from the main body 11, and the direction of extension of the first projection 111 coincides with the radial direction of the main body 11, with the first projection 111 and the second projection 112 being coaxially arranged. The mounting opening 1101 is provided on the first projection 111, and the second opening 103 is provided on the second projection 112. By installing it in this manner, the radial dimensions of the valve body 10 can be reduced.

[0108] In this embodiment, the valve seat 12 includes a first segment and a second segment that communicate in a stepped manner along the axial direction, the diameter of the first segment being smaller than the diameter of the second segment, the first segment being inserted into the mounting opening 1101 and screwed into the main body 11, and the stepped surface formed by the second segment and the first segment abutting and engaging with the end face of the first projection 111 that is away from the second projection 112. By installing it in this manner, the assembly of the valve seat 12 and the main body 11 can be facilitated.

[0109] Furthermore, the second mounting groove 105 is positioned on the valve seat 12, the second mounting groove 105 and the first opening 101 communicate in the axial direction of the valve seat 12, the second mounting groove 105 and the first opening 101 are coaxial, the cross-sectional area of ​​the second mounting groove 105 is larger than the cross-sectional area of ​​the first opening 101, and the second mounting groove 105 communicates with the flow passage 102. When the length of the second spring 40 is relatively long, it is necessary to increase the depth of the second mounting groove 105 to accommodate the second spring 40, provided that a sufficiently long first spring 30 is located within the flow passage 102. In this case, only the axial dimension of the first projection 111 and the axial dimension of the valve seat 12 need to be changed, thus improving the adaptability of the drain valve of this solution. In addition, the above installation makes it easier to process and mold the second mounting groove 105.

[0110] As shown in Figures 15 to 17, specifically, the valve core member 20 includes a valve stem 21, a valve core body 22, and a locking portion 23. Two valve core bodies 22 are provided, each positioned at both ends of the valve stem 21, and the two valve core bodies 22 correspond to the first opening 101 and the second opening 103, respectively. The locking portion 23 is positioned on the outer circumferential surface of the valve stem 21, and the first spring 30 and the second spring 40 are both fitted onto the valve stem 21 and positioned on both sides of the locking portion 23, respectively. The first end of the first spring 30 is locked and engaged with the locking portion 23, and the second end of the second spring 40 is locked and engaged with the locking portion 23. By installing them in this manner, the assembly of the first spring 30, the second spring 40, and the valve core member 20 can be easily performed.

[0111] This solution does not impose any restrictions on the specific shape or number of the locking portion 23, and multiple locking portions 23 can be provided at intervals in the circumferential direction of the valve stem 21. In this embodiment, one locking portion 23 is provided, and the locking portion 23 is provided in a ring shape on the outer circumference of the valve stem 21.

[0112] In this solution, two sets of locking portions 23 can be provided spaced apart in the axial direction of the valve stem 21. One of these locking portions engages with the first end of the first spring 30, and the other locks with the second end of the second spring 40.

[0113] This solution does not impose any limitations on the specific method of connection between the locking portion 23 and the valve stem 21, and connection by snap-fit, welding, or fastener is possible. In this embodiment, the locking portion 23 is molded integrally with the valve stem 21.

[0114] This solution does not impose any restrictions on the specific form in which the first opening 101 and the second opening 103 of the valve core member 20 are opened.

[0115] As shown in Figure 16, in this embodiment, a notch structure is provided on the outer circumferential surface of the first end of the valve core member 20. When the valve core member 20 is in the first limit position, the first end of the valve core member 20 is inserted into the first opening 101, closing the first opening 101, and the notch structure is located within the second mounting groove 105. The second end of the valve core member 20 is inserted into the second opening 103, closing the second opening 103.

[0116] In this embodiment, the water temperature at which the drain valve opens is 0-3°C. When the water temperature reaches this range, the spring force of the first spring 30 becomes greater than the spring force of the second spring 40, causing the first spring 30 to stretch and the second spring 40 to contract. The valve core member 20 moves along the direction from the second opening 103 toward the first opening 101, until the notch structure is positioned within the first opening 101. A passage for fluid flow is formed between the notch structure and the first opening 101, and simultaneously, The second end of the valve core member 20 is separated from the second opening 103, and a gap is formed between the end face of the second end of the valve core member 20 and the end face of the second opening 103 that is close to the first opening 101, thereby opening the valve. When the water temperature exceeds 3-5°C, the first spring 30 contracts, the spring force of the second spring 40 becomes greater than the spring force of the first spring 30, and the valve core member 20 moves along the direction from the first opening 101 to the second opening 103, thereby closing the valve.

[0117] The drain valve in this solution directly senses the fluid temperature via the first spring 30, and because it has a fast sensing speed and at least half the length of the first spring 30 is immersed in the fluid, the sensing accuracy of the first spring 30 is further ensured, and the accuracy of valve opening can be ensured. Furthermore, the drain valve in this solution controls the first opening 101 and the second opening 103 via a single valve core member 20, resulting in a simple structure, reliable operation, fast response speed, and long service life. The drain valve in this solution is highly adaptable as it can be applied to both negative and positive pressure conditions. In addition, the drain valve in this solution is relatively easy to assemble.

[0118] As shown in Figures 18 and 19, the differences between the drain valve provided by the fifth embodiment of this application and the fourth embodiment are as follows: The notch structure is located on the outer circumferential surface of the second end of the valve core member 20, and when the valve core member 20 is in the first limit position, the notch structure is located within the first mounting groove 104.

[0119] In this embodiment, the water temperature at which the drain valve opens is 0 to 3°C. When the water temperature reaches this range, the first spring 30 contracts, and the spring force of the first spring 30 becomes less than the spring force of the second spring 40, causing the second spring 40 to extend. The valve core member 20 moves along the direction from the first opening 101 to the second opening 103, until the notch structure is located inside the second opening 103. A passage for fluid flow is formed between the notch structure and the second opening 103, and at the same time, the valve core member 20 The first end of the valve core member 20 is separated from the first opening 101, and a gap is formed between the end face of the first end of the valve core member 20 and the end face of the first end of the first opening 101 that is close to the second opening 103, thereby opening the valve. When the water temperature exceeds 3-5°C, the first spring 30 extends, the spring force of the second spring 40 becomes smaller than the spring force of the first spring 30, the second spring 40 contracts, and the valve core member 20 moves along the direction from the second opening 103 toward the first opening 101, thereby closing the valve.

[0120] As shown in Figures 20 to 22, the sixth embodiment of the present application provides a drain valve including a valve body 10 and a valve core member 20. The valve body 10 includes a sequentially connected first opening 101, a flow passage 102 and a second opening 103, the flow passage 102 being for the flow of fluid, the first opening 101 and the second opening 103 being located on opposite sides of the flow passage 102, that is, the first opening 101 and the second opening 103 being spaced apart along the circumferential direction of the flow passage 102, and the first opening 101 and the second opening 103 being positioned opposite each other. The first end of the valve core member 20 is provided corresponding to the first opening 101, and the second end of the valve core member 20 is provided corresponding to the second opening 103. When the first end of the valve core member 20 closes the first opening 101, the second end of the valve core member 20 closes the second opening 103. The valve core member 20 is movable relative to the valve body 10, thereby allowing the first opening 101 and the second opening 103 to open synchronously. The valve core member 20 has a first limit position and a second limit position that are positioned opposite each other. When the valve core member 20 is in the first limit position, both the first opening 101 and the second opening 103 are closed. When the valve core member 20 is in the second limit position, both the first opening 101 and the second opening 103 are open.

[0121] By applying the technical solution of this application, a second opening 103 that communicates with the flow passage 102 is provided, so that when draining from the first opening 101, the flow passage 102 can communicate with the outside through the second opening 103. As a result, it is possible to avoid or mitigate the decrease in the smoothness of drainage caused by the flow passage 102 being in a negative pressure state and the pressure difference between the inside and outside of the valve body 10 being too large.

[0122] Specifically, during use, the drain valve is installed between two pipelines, and both ends of the flow passage 102 are in communication with the two pipelines. When drainage is not required, the valve core member 20 is in the first limit position, and both the first opening 101 and the second opening 103 are closed. When drainage is required, the valve core member 20 is in the second limit position, and both the first opening 101 and the second opening 103 are open. At this time, the fluid inside the valve body 10 is discharged from the first opening 101, and the flow passage 102 is in communication with the outside via the second opening 103, thereby ensuring that the pressure inside the flow passage 102 matches the external atmospheric pressure and ensuring smooth fluid discharge. In conventional technical solutions, the valve body is provided with only one drain port, the flow passage is under negative pressure, and the pressure difference between the inside and outside of the valve body is relatively large, resulting in relatively poor fluid flow within the flow passage and affecting the smoothness of drainage. Compared to conventional technical solutions, when the flow passage 102 of the drain valve in this solution is under negative pressure, the flow passage 102 can communicate with the outside through the second opening 103, resulting in equal pressure inside and outside the valve body 10 and ensuring smooth fluid flow. Furthermore, when the flow passage 102 of the drain valve in this solution is under positive pressure, the second opening 103 can be used as a drain port to discharge the fluid in the flow passage 102, thereby improving the drainage capacity of the drain valve. Moreover, in this solution, the first opening 101 and the second opening 103 are controlled by the same valve core member 20, resulting in a simpler structure and more reliable operation.

[0123] Furthermore, as the first end of the valve core member 20 opens the first opening 101, the second end of the valve core member 20 opens the second opening 103. By installing it in this way, the first opening 101 and the second opening 103 can be controlled by the same valve core member 20 and can open synchronously, thereby enabling more synchronous and precise control of drainage and intake, and ensuring the stability of the operation of the drain valve. When the second opening 103 is used as the intake port and the first opening 101 as the drain port, their opening and closing are related to the temperature of the fluid inside the valve and are unrelated to the pressure inside the valve, so there is no risk of low-pressure leakage at the intake port.

[0124] Furthermore, the first end of the valve core member 20 closes the first opening 101, while the second end of the valve core member 20 closes the second opening 103. This installation further ensures the synchronization and precision of the control of drainage and intake, and ensures the stability of the operation of the drain valve.

[0125] Furthermore, the first opening 101 includes a first ring-shaped sealing surface, and the first end of the valve core member 20 includes a second ring-shaped sealing surface. When the first end of the valve core member 20 closes the first opening 101, the first ring-shaped sealing surface and the second ring-shaped sealing surface engage in a sealed manner. The second opening 103 includes a third ring-shaped sealing surface, and the second end of the valve core member 20 includes a fourth ring-shaped sealing surface. When the second end of the valve core member 20 closes the second opening 103, the third ring-shaped sealing surface and the fourth ring-shaped sealing surface engage in a sealed manner. When the first ring-shaped sealing surface and the second ring-shaped sealing surface separate, the third ring-shaped sealing surface and the fourth ring-shaped sealing surface separate. By installing it in this manner, it is possible to open the first opening 101 and the second opening 103 synchronously.

[0126] As shown in Figures 21 and 22, specifically, a notch structure is provided on the outer circumferential surface of the valve core member 20. When the valve core member 20 is in the first limit position, the notch structure is located between the first opening 101 and the second opening 103. The notch structure is provided in correspondence with the first opening 101 and / or the second opening 103. When the valve core member 20 switches from the first limit position to the second limit position, the valve core member 20 moves along a direction from one opening towards the other opening corresponding to the notch structure. At least a portion of the notch structure is located within the opening corresponding to the notch structure. A flow path for fluid circulation is formed between the notch structure and the corresponding opening, and the flow path and the circulation passage 102 are in communication. By providing the notch structure, it becomes possible to control the first opening 101 and the second opening 103 simultaneously with the same valve core member 20.

[0127] The structural strength of the valve core member 20 corresponding to the notch structure is relatively low, and when the valve core member 20 is in the first limit position, the notch structure is located between the first opening 101 and the second opening 103. This prevents the notch structure from being exposed to the outside of the valve body 10, thus preventing the valve core member 20 from being damaged by collision with an external object and ensuring the service life of the valve core member 20.

[0128] The notch structure may be provided as one set or as two sets along the axial direction of the valve core member 20. If two sets of notch structures are provided, the two sets of notch structures correspond to the first opening 101 and the second opening 103, respectively.

[0129] As shown in Figures 21 and 22, in this embodiment, a set of notches is provided along the axial direction of the valve core member 20, and the notches are provided corresponding to the first opening 101. When the valve core member 20 is in the first limit position, the second end of the valve core member 20 is inserted into the second opening 103 to close the second opening 103, and the first end of the valve core member 20 is inserted into the first opening 101 to close the first opening 101, and the notches are located on the side of the first opening 101 that is close to the flow passage 102, and when the valve core member 20 switches from the first limit position to the second limit position, the valve core member 20 moves from the second opening 103 to the first opening 101 As it moves along the direction it is moving, the second end of the valve core member 20 detaches from the second opening 103, and there is a gap between the end face of the second end of the valve core member 20 and the end face of the second opening 103 that is close to the first opening 101, and at least a portion of the notched structure is located inside the first opening 101, and a first flow path for fluid to flow is formed between the first opening 101 and the notched structure, and the first flow path communicates with the flow passage 102.

[0130] This embodiment does not impose any limitations on the specific form or shape of the notch structure, and multiple notch structures can be provided at intervals in the circumferential direction of the valve core member 20.

[0131] In this embodiment, one notch structure is provided, and the notch structure is provided in a ring shape on the outer surface of the valve core member 20 along the circumferential direction of the valve core member 20, both ends of the first opening 101 are chamfered and are aligned in the axial direction, and the distance between the two opposing side walls of the notch structure gradually increases along the direction from the center to the edge, thereby fitting the notch structure to the first opening 101 and facilitating fluid flow when installed in this manner.

[0132] Specifically, in this embodiment, the axial dimension of the first opening 101 is the same as the axial dimension of the second opening 103, and when the valve core member 20 is in the first limit position, the first end of the valve core member 20 is inserted into the first opening 101 and closes the first opening 101, and the end face of the first end of the valve core member 20 is substantially flush with the end face of the first opening 101 that is away from the second opening 103, and the end face of the notched structure that is away from the second opening 103 is substantially flush with the end face of the first opening 101 that is close to the second opening 103, and the second end of the valve core member 20 is inserted into the second opening 103 and closes the second opening 103, and the end of the second end of the valve core member 20 is substantially flush with the end face of the second opening 103 that is away from the first opening 101. By installing it in this manner, when the valve core member 20 moves along the direction from the second opening 103 toward the first opening 101, it is possible to open both the first opening 101 and the second opening 103 simultaneously.

[0133] Furthermore, the drain valve further includes a communication groove provided between the flow passage 102 and the opening corresponding to the notch structure, with one end of the communication groove communicating with the flow passage 102 and the other end of the communication groove communicating with the flow path to allow fluid to flow.

[0134] As shown in Figures 21 and 22, in this embodiment, the communication groove includes a second mounting groove 105, which is provided on the inner wall of the valve body 10. One end of the second mounting groove 105 communicates with the flow passage 102, and the other end of the second mounting groove 105 communicates with the first flow path. By providing the second mounting groove 105, the first flow path and the flow passage 102 can be easily connected.

[0135] Specifically, the communication groove is provided coaxially with the corresponding opening of the notch structure, and the cross-sectional area of ​​the communication groove is larger than the cross-sectional area of ​​the corresponding opening of the notch structure. In this embodiment, the second mounting groove 105 communicates with the first opening 101 in a stepped manner, the second mounting groove 105 is arranged coaxially with the first opening 101, and the diameter of the second mounting groove 105 is larger than the diameter of the first opening 101. When assembling, the valve core member 20 is inserted into the second mounting groove 105, and a passage for fluid flow is formed in the space between the second mounting groove 105 and the side wall of the valve core member 20. The installation of the second mounting groove 105 is simple in structure and easy to mold.

[0136] As shown in Figures 21 and 22, the drain valve further includes a first spring 30 and a second spring 40. Both the first spring 30 and the second spring 40 are located within the valve body 10, and the first spring 30 and the second spring 40 apply opposite forces to the valve core member 20, and the first spring 30 and the second spring 40 cooperate to drive and move the valve core member 20. One of the first spring 30 and the second spring 40 is a shape memory alloy spring. The drain valve of this solution can sense the temperature of the fluid in the pipeline, and when the fluid temperature changes within a predetermined range, it opens the first opening 101 to discharge the fluid in the pipeline. The first spring 30 can sense changes in the temperature of the fluid inside the valve body 10. When the temperature of the fluid inside the valve body 10 changes, the first spring 30 can extend or contract. When the first spring 30 extends, the second spring 40 is compressed, and when the first spring 30 contracts, the second spring 40 extends. The first spring 30 and the second spring 40 work together to drive and move the valve core member 20. The installation of the first spring 30 and the second spring 40 results in a simple structure, a long service life, and a relatively fast sensing speed of the first spring 30 for changes in the fluid temperature inside the valve body 10, ensuring the sensitivity of the valve core member 20 in opening and closing the valve.

[0137] In other embodiments of this solution, the drain valve may include a thermostat and a second spring 40, both of which are located within the valve body 10. The thermostat is used to sense the temperature of the fluid within the valve body 10, and when the fluid temperature changes, the thermostat deforms and works in cooperation with the return spring to drive and move the valve core member 20.

[0138] As shown in Figures 21 and 22, in this solution, the first spring 30 and the second spring 40 are fitted onto the valve core member 20 at intervals along the axial direction of the valve core member 20, with the first end of the first spring 30 in contact with the valve core member 20, the second end of the first spring 30 in contact with the inner wall of the valve body 10, the first end of the second spring 40 in contact with the inner wall of the valve body 10, and the second end of the second spring 40 in contact with the valve core member 20. By installing them in this manner, the convenience of assembling the second spring 40 and the first spring 30 with the valve core member 20 can be ensured. This solution does not impose any limitations on the specific positions of the second spring 40 and the first spring 30. The second spring 40 may be positioned close to the first opening 101 or close to the second opening 103. However, in this embodiment, the second spring 40 is positioned close to the first opening 101.

[0139] Specifically, in this embodiment, the first end of the second spring 40 is inserted into the second mounting groove 105, and the second mounting groove 105 engages with the second spring 40 in a locking manner. By installing it in this manner, the stability of the contact between the second spring 40 and the valve body 10 can be ensured.

[0140] Furthermore, in this embodiment, the valve body 10 further includes a first mounting groove 104, which is provided on the inner wall of the valve body 10, is located on the side of the second opening 103 that is close to the flow passage 102, and communicates with the second opening 103 in a stepped manner, the diameter of the first mounting groove 104 is larger than the diameter of the second opening 103, the second end of the first spring 30 is inserted into the first mounting groove 104 and locks into engagement with the first mounting groove 104, and the installation of the first mounting groove 104 is simple in structure and easy to process and mold.

[0141] Specifically, the valve core member 20 includes a valve stem 21, a valve core body 22, and a locking portion 23. Two valve core bodies 22 are provided, each located at both ends of the valve stem 21, and the two valve core bodies 22 correspond to the first opening 101 and the second opening 103, respectively. The locking portion 23 is provided on the outer circumferential surface of the valve stem 21, and the first spring 30 and the second spring 40 are both fitted onto the valve stem 21 and are located on both sides of the locking portion 23, respectively. The first end of the first spring 30 engages with the locking portion 23, and the second end of the second spring 40 engages with the locking portion 23. By installing them in this manner, the assembly of the first spring 30, the second spring 40, and the valve core member 20 can be easily performed.

[0142] This solution does not impose any restrictions on the specific shape or number of the locking portion 23, and multiple locking portions 23 can be provided at intervals in the circumferential direction of the valve stem 21. In this embodiment, one locking portion 23 is provided, and the locking portion 23 is provided in a ring shape on the outer circumference of the valve stem 21.

[0143] In this solution, two sets of locking portions 23 can be provided spaced apart along the axial direction of the valve stem 21. One set of locking portions engages with the first end of the first spring 30, and the other set engages with the second end of the second spring 40.

[0144] This solution does not impose any limitations on the specific method of connection between the locking portion 23 and the valve stem 21, and connection by snap-fit, welding, or fastener is possible. In this embodiment, the locking portion 23 is molded integrally with the valve stem 21.

[0145] As shown in Figures 21 and 22, specifically, the valve body 10 includes a main body 11 and a valve seat 12. The main body 11 has a mounting opening 1101, a flow passage 102, and a second opening 103. The mounting opening 1101 is provided on the side wall of the main body 11, communicates with the flow passage 102, and is positioned opposite the second opening 103. The valve seat 12 is provided separately from the main body 11 and is positioned at the location of the mounting opening 1101. The first opening 101 and the second mounting groove 105 are both provided on the valve seat 12, and the first opening 101 and the second mounting groove 105 communicate in a stepped manner along the axial direction of the valve seat 12. One end of the second mounting groove 105, away from the first opening 101, is used to communicate with the flow passage 102. By installing it in this way, the assembly of the drain valve can be made easier.

[0146] When assembling the drain valve, the valve core member 20, the first spring 30, and the second spring 40 are assembled first, and then the entire assembled assembly is placed inside the valve body 10 through the mounting opening 1101. That is, the second end of the valve core member 20 is inserted into the second opening 103, and the second end of the first spring 30 is inserted into the first mounting groove 104. Next, the valve seat 12 is assembled to the main body 11 via the mounting opening 1101, with the first end of the second spring 40 being inserted into the second mounting groove 105, and the first end of the valve core member 20 being inserted into the first opening 101.

[0147] Specifically, the valve seat 12 is screwed to the main body 11 via a mounting opening 1101, and the drain valve further includes a sealing member 50, which is provided between the main body 11 and the valve seat 12 to seal the gap between the main body 11 and the valve seat 12. The screw connection method facilitates the assembly of the main body 11 and the valve seat 12, and the sealing member 50 ensures the airtightness of the connection between the main body 11 and the valve seat 12.

[0148] As shown in Figures 20 to 22, specifically, the main body 11 includes a first projection 111 and a second projection 112, which are spaced apart along the circumferential direction of the main body 11, both of which protrude to the outside of the main body 11, and the direction of extension of the first projection 111 coincides with the radial direction of the main body 11, and the first projection 111 and the second projection 112 are arranged coaxially. The mounting opening 1101 is provided on the first projection 111, and the second opening 103 is provided on the second projection 112. By installing it in this way, the radial dimensions of the valve body 10 can be reduced.

[0149] In this embodiment, the valve seat 12 includes a first segment and a second segment that are connected in a stepped manner along the axial direction, the diameter of the first segment being smaller than the diameter of the second segment, the first segment being inserted into the mounting opening 1101 and screwed into the main body 11, and the stepped surface formed by the second segment and the first segment abutting and engaging with the end face of the first projection 111 away from the second projection 112. The sealing member 50 is provided in a ring shape at the connection position between the first segment and the second segment. By installing them in this manner, convenience in assembling the valve seat 12, the sealing member 50, and the main body 11 can be ensured.

[0150] In the solution, when the flow passage 102 is under negative pressure, the flow passage 102 can communicate with the outside through the second opening 103. As a result, the air pressure inside and outside the valve body 10 is balanced, ensuring smooth fluid flow. The drain valve in this solution can perform intake and drainage simultaneously, thereby enabling more synchronous and precise control of drainage and intake, and ensuring the stability of the drain valve's operation. When the second opening 103 is used as an intake port, its opening and closing are related to the temperature of the fluid inside the valve and independent of the pressure inside the valve, thus eliminating the risk of low-pressure leakage at the intake port. ru.

[0151] In this solution, when the flow passage 102 is under positive pressure, the drain valve can use the second opening 103 as a drain port to discharge the fluid in the flow passage 102, thereby improving the drainage capacity of the drain valve.

[0152] This solution has a simpler structure and more reliable operation because the same valve core member 20 controls both the first opening 101 and the second opening 103. The installation method of the second mounting groove 105 and the first mounting groove 104 allows a single valve core member 20 to simultaneously control both the first opening 101 and the second opening 103, regardless of whether the notch structure of the valve core member 20 corresponds to the first opening 101 or the second opening 103. In other words, when the valve core member 20 is in the first limit position, the notch structure of the valve core member 20 can be located within the second mounting groove 105 or the first mounting groove 104. By installing it in this way, the adaptability of the drain valve of this solution is improved.

[0153] The drain valve in this solution is installed between two water pipes and can sense the temperature of the fluid inside the water pipes. The valve opening temperature is set to 0-3°C. When the water temperature drops to 0-3°C, the first spring 30 extends, and the spring force of the first spring 30 becomes greater than the spring force of the second spring 40. The valve core member 20 moves along the direction from the second opening 103 towards the first opening 101, and the first opening 101 and the second opening 103 open simultaneously. When the water temperature exceeds 3-5°C, the first spring 30 contracts, and the spring force of the second spring 40 becomes greater than the spring force of the first spring 30. The valve core member 20 moves along the direction from the first opening 101 towards the second opening 103, and the first opening 101 and the second opening 103 close simultaneously.

[0154] As shown in Figures 23 and 24, the seventh embodiment of this application provides a drain valve which differs from the sixth embodiment in the following ways: The notch structure is provided corresponding to the second opening 103, and the first end of the valve core member 20 is inserted into the first opening 101 to close the first opening 101; the notch structure is located within the first mounting groove 104, and the second end of the valve core member 20 is inserted into the second opening 103 to close the second opening 103.

[0155] As the valve core member 20 moves from the first limit position to the second limit position, the valve core member 20 moves along the direction from the first opening 101 to the second opening 103, the notch structure is located inside the second opening 103, and the space between the notch structure and the second opening 103 and the space between the valve core member 20 and the first mounting groove 104 communicate with each other to form a passage for fluid flow, the first end of the valve core member 20 and the first opening 101 are separated, and a passage for fluid flow is formed between the end face of the first end of the valve core member 20 and the end face of the first opening 101 that is close to the second opening 103.

[0156] The drain valve in this embodiment is installed between two water pipes and can sense the temperature of the water flowing through the pipes. The valve opening temperature is set to 0-3°C. When the water temperature reaches this temperature range, the first spring 30 contracts, the spring force of the second spring 40 becomes greater than that of the first spring 30, and the valve core member 20 moves along the direction from the first opening 101 to the second opening 103, opening both the first and second openings 101 and 103 simultaneously. When the water level exceeds 3-5°C, the first spring 30 extends, the spring force of the first spring 30 becomes greater than that of the second spring 40, and the valve core member 20 moves along the direction from the second opening 103 to the first opening 101, closing both the first and second openings 101 and 103 simultaneously.

[0157] It should be noted that the terms used herein are for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments of this application. Unless otherwise explicitly indicated in the context, the singular form is intended to include the plural form, as used herein, and it should be understood that when the terms “contains” and / or “includes” are used herein, it means that features, processes, operations, devices, assemblies and / or combinations thereof exist.

[0158] 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 is required for it in subsequent drawings.

[0159] In the description of this application, it should be understood that the directional terms or positional relationships indicated by "front, back, up, down, left, right," "lateral, vertical, perpendicular, horizontal," and "top, bottom," etc., are generally based on the directions or positional relationships shown in the attached drawings and are merely for the convenience of easily describing this application and making the description concise. Unless otherwise stated, these directional 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 directional terms "inside" and "outside" refer to the inside and outside of the contour of each part itself.

[0160] 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.

[0161] 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.

[0162] 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]

[0163] 10 Valve body 101 First opening 102 Distribution aisle 103 Second opening 1031 Mounting segment 1032 Blocked segment 1033 Position regulation section, 104 First mounting groove 105 Second mounting groove 11 Main body 1101 Mounting port 111 1st protrusion 112 Second protrusion 12 valve seats 20 Valve core member 201 First locking structure 202 Second locking structure 203 First notch 204 Second cutoff 205 Position regulation structure 21 Valve stem 211 Main Segment 212 connection segments 22 Valve core body 23 Locking part 30 First spring 31. First Guidance Segment 32 Second guidance segment, 40 Second spring 41 Third Guidance Segment 42. Fourth Guidance Segment 50 Sealing member

Claims

1. A valve body (10) comprising sequentially connected first opening (101), flow passage (102), and second opening (103), wherein the flow passage (102) is for the flow of fluid, the first opening (101) and the second opening (103) are located on opposite sides of the flow passage (102), the first opening (101) and the second opening (103) are arranged opposite each other, and the first opening (101) is for the discharge of fluid from the flow passage (102), and the valve body (10), A valve core member (20) wherein the first end of the valve core member (20) is provided corresponding to the first opening (101), the second end of the valve core member (20) is provided corresponding to the second opening (103), and the valve core member (20) is movable relative to the valve body (10) to open and close the first opening (101), and Equipped with, The valve core member (20) has a first limit position and a second limit position that are arranged opposite to each other. When the valve core member (20) is in the first limit position, the first end of the valve core member (20) closes the first opening (101), and the second end of the valve core member (20) closes the second opening (103). When the valve core member (20) is in the second limit position, the first end of the valve core member (20) opens the first opening (101). Drain valve.

2. When the cross-sectional area of ​​the first opening (101) is S1 and the cross-sectional area of ​​the second opening (103) is S2, [Math 1] That is, The drain valve according to claim 1.

3. When the valve core member (20) is in the second limit position, the second end of the valve core member (20) opens the second opening (103). The drain valve according to claim 1.

4. The drain valve further comprises a first spring (30) and a second spring (40), Both the first spring (30) and the second spring (40) are provided within the valve body (10), The first spring (30) and the second spring (40) apply opposing forces to the valve core member (20). Either the first spring (30) or the second spring (40) is a shape memory alloy spring. The drain valve according to claim 1.

5. The second spring (40) and the first spring (30) are fitted onto the valve core member (20) at intervals in the axial direction of the valve core member (20). The first end of the first spring (30) is in contact with the valve core member (20), and the second end of the first spring (30) is in contact with the inner wall of the valve body (10). The first end of the second spring (40) is in contact with the inner wall of the valve body (10), and the second end of the second spring (40) is in contact with the valve core member (20). The drain valve according to claim 4.

6. The aforementioned drain valve, A first axial position restricting structure is provided between the valve core member (20) and the first spring (30), and is configured to restrict the movement of the first end of the first spring (30) relative to the valve core member (20) in a direction toward the second opening (103) toward the first opening (101), A second axial position restricting structure is provided between the valve body (10) and the first spring (30), and is configured to restrict the movement of the second end of the first spring (30) relative to the valve body (10) in a direction toward the second opening (103), Furthermore, The drain valve according to claim 5.

7. The valve core member (20) includes a first locking structure (201), The first end of the first spring (30) is locked and engaged with the first locking structure (201), The first locking structure (201) forms the first axial position restricting structure, The inner wall of the valve body (10) is provided with a first mounting groove (104), The first mounting groove (104) is located between the second opening (103) and the flow passage (102), One end of the first mounting groove (104) is in communication with the second opening (103), and the other end of the first mounting groove (104) is in communication with the flow passage (102). The cross-sectional area of ​​the first mounting groove (104) is larger than the cross-sectional area of ​​the second opening (103). The end of the first spring (30) that is away from the second spring (40) is inserted into the first mounting groove (104) and is locked and engaged with the first mounting groove (104). The first mounting groove (104) forms the second axial position regulating structure. The drain valve according to claim 6.

8. The aforementioned drain valve, A third axial position restricting structure is provided between the valve body (10) and the second spring (40), and is configured to restrict the movement of the first end of the second spring (40) relative to the valve body (10) along the direction from the second opening (103) to the first opening (101), A fourth axial position restricting structure is provided between the valve core member (20) and the second spring (40), and is configured to restrict the movement of the second end of the second spring (40) relative to the valve core member (20) in the direction from the first opening (101) to the second opening (103), Furthermore, The drain valve according to claim 5.

9. The inner wall of the valve body (10) is provided with a second mounting groove (105). The second mounting groove (105) is located between the first opening (101) and the flow passage (102), One end of the second mounting groove (105) is in communication with the first opening (101), and the other end of the second mounting groove (105) is in communication with the flow passage (102). The cross-sectional area of ​​the second mounting groove (105) is larger than the cross-sectional area of ​​the first opening (101). The end of the second spring (40) that is away from the first spring (30) is inserted into the second mounting groove (105) and is locked and engaged with the second mounting groove (105). The second mounting groove (105) forms the position regulating structure in the third axial direction, The valve core member (20) includes a second locking structure (202), One end of the second spring (40) that is close to the first spring (30) is locked and engaged with the second locking structure (202). The second locking structure (202) forms the fourth axial position restricting structure. The drain valve according to claim 8.

10. When the valve core member (20) is in the first limit position, the first end of the valve core member (20) is inserted into the first opening (101) and closes the first opening (101). When the valve core member (20) switches from the first limit position to the second limit position, the valve core member (20) moves along the direction from the first opening (101) toward the second opening (103) to open the first opening (101), or A first notch (203) is provided on the outer circumferential surface of the first end of the valve core member (20). When the valve core member (20) is in the first limit position, the first end of the valve core member (20) is inserted into the first opening (101) and closes the first opening (101). The first notch (203) is located on the side of the first opening (101) that is close to the flow passage (102). When the valve core member (20) switches from the first limit position to the second limit position, the valve core member (20) moves along a direction from the second opening (103) toward the first opening (101). At least a portion of the first notch (203) is located within the first opening (101). A first flow path for fluid flow is formed between the first opening (101) and the first notch (203), and the first flow path communicates with the flow passage (102). The drain valve according to claim 1.

11. The valve body (10) is A main body portion (11) including a mounting opening (1101), the flow passage (102), and the second opening (103), wherein the mounting opening (1101) communicates with the flow passage (102) and the main body portion (11), A valve seat (12) is provided separately from the main body (11), and is located at the mounting opening (1101), and the valve seat (12) has the first opening (101), including, The drain valve according to claim 1.

12. The second opening (103) includes sequentially connected mounting segments (1031) and closing segments (1032), The mounting segment (1031) is located on the side of the blocking segment (1032) that is close to the flow passage (102). The diameter of the mounting segment (1031) is smaller than the diameter of the closing segment (1032). The second end of the valve core member (20) is configured to be able to close or open the closing segment (1032), The drain valve further comprises a first spring (30) fitted onto the valve core member (20), the first spring (30) being used to apply a force to the valve core member (20) to close or open the closing segment (1032), The first end of the first spring (30) is connected to the valve core member (20), and the second end of the first spring (30) is located within the mounting segment (1031). The drain valve according to claim 1.

13. The drain valve further includes a position regulating portion (1033), The position regulating portion (1033) is provided within the second opening (103) and is located between the closing segment (1032) and the mounting segment (1031). The end face of the second end of the first spring (30) is in contact with and engaged with the side of the position regulating portion (1033) away from the closing segment (1032). The drain valve according to claim 12.

14. Multiple position regulating units (1033) are provided, The multiple position regulating portions (1033) are arranged on the side wall of the second opening (103) at intervals in the circumferential direction of the second opening (103). The drain valve according to claim 13.

15. The position regulating portion (1033) is arranged in a ring shape on the side wall of the second opening (103) along the circumferential direction of the second opening (103), A fluid passage is formed between the inner wall of the position regulating portion (1033) and the side wall of the valve core member (20) for the flow of fluid. The drain valve according to claim 13.

16. The valve core member (20) includes a position regulating structure (205), The position restricting structure (205) is locked and engaged with the position restricting structure (1033) so as to restrict the movement of the valve core member (20). The drain valve according to claim 13.

17. The first spring (30) includes a first guide segment (31) and a second guide segment (32) that are sequentially provided along the direction from the mounting segment (1031) toward the closing segment (1032), The diameter of the second guide segment (32) is larger than the diameter of the first guide segment (31). The second guide segment (32) is located within the mounting segment (1031), The outer wall of the second guide segment (32) is guide-engaged with the mounting segment (1031), The first guide segment (31) is fitted in clearance with the valve core member (20). The drain valve according to claim 12.

18. The drain valve further comprises a second spring (40) fitted onto the valve core member (20), the first end of the second spring (40) being connected to the valve body (10), and the second end of the second spring (40) being connected to the valve core member (20), The second spring (40) and the first spring (30) apply opposing forces to the valve core member (20). The second spring (40) and the first spring (30) work together to move the valve core member (20), Either the second spring (40) or the first spring (30) is a shape memory alloy spring. The valve body (10) is further provided with a second mounting groove (105), The second mounting groove (105) is located between the flow passage (102) and the first opening (101), The diameter of the second mounting groove (105) is larger than the diameter of the first opening (101). The first end of the second spring (40) is located within the second mounting groove (105), and the outer wall of the first end of the second spring (40) is guided and engaged with the second mounting groove (105). The drain valve according to claim 12.

19. The valve core member (20) includes a valve stem (21) and a valve core body (22) that are sequentially provided along the direction from the mounting segment (1031) toward the closing segment (1032), The cross-sectional area of ​​the valve core body (22) is larger than the cross-sectional area of ​​the valve stem (21). The first spring (30) is fitted onto the valve stem (21), One end of the valve stem (21) is inserted into the mounting segment (1031), The valve core body (22) is used to close or open the closing segment (1032). The drain valve according to claim 12.

20. The drain valve further comprises a first spring (30) provided within the valve body (10), The first spring (30) is a shape memory alloy spring, The first spring (30) is driven and connected to the valve core member (20) such that the valve core member (20) opens or closes the first opening (101), When the valve core member (20) closes the first opening (101), at least half the length of the first spring (30) in the direction of expansion and contraction of the first spring (30) is located within the flow passage (102). The drain valve according to claim 1.

21. When the valve core member (20) is in the second limit position, the second end of the valve core member (20) opens the second opening (103). The drain valve according to claim 20.

22. The valve body (10) further includes a first mounting groove (104), The first mounting groove (104) is provided on the inner wall of the valve body (10), The first mounting groove (104) is in communication with the flow passage (102), The second end of the first spring (30) is fitted into the first mounting groove (104) and locked and engaged with the first mounting groove (104). The drain valve according to claim 21.

23. The extending direction of the first mounting groove (104) coincides with the radial direction of the flow passage (102), The radius of the aforementioned flow passage (102) is greater than the depth of the first mounting groove (104). When the valve core member (20) closes the first opening (101), the length of the first end of the first spring (30) protruding from the first mounting groove (104) in the radial direction of the flow passage (102) is greater than the radius of the flow passage (102). The drain valve according to claim 22.

24. The first opening (101) is configured to open in sync with the second opening (103). The drain valve according to claim 1.

25. The first opening (101) includes a first ring-shaped sealing surface, The first end of the valve core member (20) includes a second ring-shaped sealing surface. When the first end of the valve core member (20) closes the first opening (101), the first ring-shaped sealing surface is sealed and engaged with the second ring-shaped sealing surface. The second opening (103) includes a third ring-shaped sealing surface. The second end of the valve core member (20) includes a fourth ring-shaped sealing surface. When the second end of the valve core member (20) closes the second opening (103), the third ring-shaped sealing surface is sealed and engaged with the fourth ring-shaped sealing surface. When the first ring-shaped sealing surface and the second ring-shaped sealing surface are separated, the third ring-shaped sealing surface is separated from the fourth ring-shaped sealing surface. The drain valve according to claim 24.

26. A notch structure is provided on the outer circumferential surface of the valve core member (20). When the valve core member (20) closes the first opening (101), the notch structure is located between the first opening (101) and the second opening (103), and the notch structure is provided corresponding to the first opening (101) and / or the second opening (103). When the valve core member (20) moves and opens the first opening (101), at least a portion of the notch structure is located within the first opening (101) and / or the second opening (103), and a fluid passage is formed between the notch structure and the corresponding opening, and the fluid passage is in communication with the fluid passage (102). The drain valve according to claim 24.

27. The drain valve further comprises a communication groove provided between the flow passage (102) and the opening corresponding to the notched structure, One end of the aforementioned communication groove is in communication with the aforementioned flow passage (102), The other end of the aforementioned communication groove is in communication with the aforementioned flow path in order to allow fluid to flow through. The drain valve according to claim 26.

28. The aforementioned communication groove is provided coaxially with the opening corresponding to the aforementioned notch structure. The cross-sectional area of ​​the communication groove is larger than the cross-sectional area of ​​the opening to which the notch structure corresponds. The drain valve according to claim 27.

Images