Drain valve

Abstract

A drain valve, which comprises: a valve body (10), comprising a first opening (101), a circulation channel (102), and a second opening (103) which are sequentially communicated, the circulation channel (102) being used for allowing fluid to circulate, the first opening (101) and the second opening (103) being respectively located on two sides of the circulation channel (102), the first opening (101) and the second opening (103) being arranged opposite one another, and the first opening (101) being used for draining fluid located in the circulation channel (102); and a valve core component (20), having a first end arranged corresponding to the first opening (101), and a second end arranged corresponding to the second opening (103), and the valve core component (20) being able to move relative to the valve body (10) so as to open and close the first opening (101); wherein the valve core component (20) has a first limit position and second limit position disposed opposite one another; when the valve core component (20) is at the first limit position, the first end of the valve core component (20) blocks the first opening (101), and the second end of the valve core component (20) blocks the second opening (103); and when the valve core component (20) is in the second limit position, the first end of the valve core component (20) opens the first opening (101). The drain valve can solve the problem of an internal / external pressure difference of the valve body (10) affecting the valve opening smoothness of the valve core component (20) during valve opening.

Description

Drain valve

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on May 11, 2023, with application number 202310542633.4 and title “Drain Valve”;

[0002] This application claims priority to a patent application filed with the State Intellectual Property Office of China on May 17, 2023, with application number 202321226668.9 and title “Drain Valve”;

[0003] This application claims priority to a patent application filed with the State Intellectual Property Office of China on May 11, 2023, with application number 202321160809.1 and title “Drain Valve”;

[0004] This application claims priority to the patent application filed with the State Intellectual Property Office of China on May 11, 2023, with application number 202310531300.1 and invention name “Drain Valve”. Technical Field

[0005] The present application relates to the field of valve technology, and in particular to a drain valve. Background Art

[0006] A drain valve is a valve used to discharge fluid from a pipe, and is usually arranged between two pipes to discharge the fluid from the two pipes. The drain valve includes a valve body and a valve core component, wherein the valve body includes a circulation channel and a drain port that are interconnected, the drain port is arranged on the side of the circulation channel, and the two ends of the circulation channel are respectively connected to two external pipes, and the valve core component is movably arranged in the circulation channel to block or open the drain port. In the prior art, the first end of the valve core component is used to block or open the drain port, and the second end of the valve core component is located in the circulation channel. Since the pressure in the circulation channel is significantly different from the pressure outside, the above arrangement causes the valve core component to be subjected to a larger pressure differential force when blocking the drain port. Therefore, in the process of opening the valve core component, the valve core component also needs to overcome the above pressure differential force, which affects the smoothness of the valve opening.

[0007] Summary of the Invention

[0008] The present application provides a drain valve to solve the problem in the prior art that when the valve core component is opened, the pressure difference between the inside and outside of the valve body affects the smoothness of opening the valve core component.

[0009] The present application provides a drain valve, which includes: a valve body, including a first opening, a circulation channel and a second opening connected in sequence, the circulation channel is used for fluid circulation, the first opening and the second opening are respectively located on both sides of the circulation channel, the first opening and the second opening are arranged opposite to each other, and the first opening is used to discharge the fluid in the circulation channel; a valve core component, the first end of the valve core component is arranged corresponding to the first opening, the second end of the valve core component is arranged corresponding to the second opening, and the valve core component can be moved relative to the valve body to open and close the first opening; wherein, the valve core component has a first extreme position and a second extreme position arranged opposite to each other, when the valve core component is in the first extreme position, the first end of the valve core component blocks the first opening, and the second end of the valve core component blocks the second opening, and when the valve core component is in the second extreme position, the first end of the valve core component opens the first opening.

[0010] Furthermore, the cross-sectional area of ​​the first opening is S1, the cross-sectional area of ​​the second opening is S2,

[0011] Further, when the valve core component is at the second extreme position, the second end of the valve core component opens the second opening.

[0012] Furthermore, the drain valve further includes: a first spring and a second spring, both of which are arranged in the valve body, and the first spring and the second spring provide forces in opposite directions to the valve core component to enable the valve core component to move relative to the valve body.

[0013] Furthermore, the second spring and the first spring are spaced apart and sleeved on the valve core component along the axial direction of the valve core component; the first end of the first spring abuts against the valve core component, and the second end of the first spring abuts against the inner wall of the valve body; the first end of the second spring abuts against the inner wall of the valve body, and the second end of the second spring abuts against the valve core component.

[0014] Furthermore, the drain valve also includes: a first axial limiting structure, which is arranged between the valve core component and the first spring, and the first axial limiting structure is used to limit the movement of the first end of the first spring relative to the valve core component along the direction from the second opening to the first opening; a second axial limiting structure, which is arranged between the valve body and the first spring, and the second axial limiting structure is used to limit the movement of the second end of the first spring relative to the valve body along the direction from the first opening to the second opening.

[0015] Furthermore, the valve core component includes a first stop structure, the first end of the first spring cooperates with the first stop structure, and the first stop structure forms a first axial limiting 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 circulation channel, one end of the first mounting groove is connected to the second opening, and the other end of the first mounting groove is connected to the circulation channel, the cross-sectional area of ​​the first mounting groove is larger than the cross-sectional area of ​​the second opening, the end of the first spring away from the second spring is inserted into the first mounting groove and cooperates with the first mounting groove stop, and the first mounting groove forms a second axial limiting structure.

[0016] Furthermore, the drain valve also includes: a third axial limiting structure, which is arranged between the valve body and the second spring, and the third axial limiting structure is used to limit the movement of the first end of the second spring relative to the valve body along the direction from the second opening to the first opening; a fourth axial limiting structure, which is arranged between the valve core component and the second spring, and the fourth axial limiting structure is used to limit the movement of the second end of the second spring relative to the valve core component along the direction from the first opening to the second opening.

[0017] Furthermore, a second mounting groove is provided on the inner wall of the valve body, and the second mounting groove is provided between the first opening and the circulation channel, one end of the second mounting groove is communicated with the first opening, and the other end of the second mounting groove is communicated with the circulation channel, the cross-sectional area of ​​the second mounting groove is larger than the cross-sectional area of ​​the first opening, and the end of the second spring away from the first spring is passed through the second mounting groove and cooperates with the second mounting groove stopper, and the second mounting groove forms a third axial limiting structure; the valve core component includes a second stop structure, and the end of the second spring close to the first spring cooperates with the second stop structure stopper, and the second stop structure forms a fourth axial limiting structure.

[0018] Further, when the valve core component is in the first extreme position, the first end of the valve core component is passed through the first opening and blocks the first opening, and when the valve core component switches from the first extreme position to the second extreme position, the valve core component moves in the direction from the first opening to the second opening to open the first opening; or, a first notch is provided on the circumferential surface of the first end of the valve core component, and when the valve core component is in the first extreme position, the first end of the valve core component is passed through the first opening and blocks the first opening, and the first notch is located on the side of the first opening close to the circulation channel; when the valve core component switches from the first extreme position to the second extreme position, the valve core component moves in the direction from the second opening to the first opening, and the first notch is located in the first opening, and a first flow channel for fluid circulation is formed between the first opening and the first notch, and the first flow channel is connected to the circulation channel.

[0019] Furthermore, the valve body includes: a main body portion having an installation port, a circulation channel and a second opening, the installation port being connected to the circulation channel; a valve seat separately provided from the main body portion, the valve seat being provided at the installation port, and the valve seat having a first opening.

[0020] The application of the technical solution of the present application can reduce the influence of the pressure difference between the inside and outside of the valve body on the valve opening of the valve core component, and ensure the smoothness of the valve opening process of the valve core component. Specifically, in the drain valve of this solution, the first opening and the second opening are respectively connected to the circulation channel. When the first end of the valve core component blocks the first opening, and the second end of the valve core component blocks the second opening, the end face of the first end of the valve core component and the end face of the second end of the valve core component are both in the same pressure environment. Such an arrangement can reduce the axial pressure differential force of the valve core component as much as possible, reduce the pressure differential load of the valve core component, reduce the pressure differential force overcome by the valve core component in the process of the valve core component opening the first opening, and ensure the smoothness of the movement process of the valve core component. In the traditional technical solution, one end of the valve core component is completely immersed in the fluid in the valve body, and the other end of the valve core component blocks the drain port. This arrangement causes one end of the valve core component to be in the pressure environment within the flow channel, while the end face of the other end of the valve core component is in the external pressure environment of the valve body. The axial pressure differential force applied to the valve core component is relatively large. Therefore, during the valve opening process, the smoothness of the movement of the valve core component is greatly affected by the pressure differential between the inside and outside of the valve body. The axial pressure differential force that the valve core component needs to overcome is relatively large, affecting the smoothness of the valve opening. Compared with the traditional technical solution, the arrangement of this solution has a simple structure, and the axial pressure differential force applied to the valve core component is relatively small, which improves the smoothness of the valve opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0022] FIG1 shows a schematic structural diagram of a drain valve provided according to a first embodiment of the present application;

[0023] FIG2 is a schematic structural diagram of a valve core component of a drain valve provided in accordance with the first embodiment of the present application when the valve core component is in a first limit position;

[0024] FIG3 shows a schematic structural diagram of the valve core component of the drain valve provided in the first embodiment of the present application when it is in the second limit position;

[0025] FIG4 shows a schematic structural diagram of the cooperation between the valve core component, the first spring and the second spring according to the first embodiment of the present application;

[0026] FIG5 shows a schematic diagram of the local structure of point A in FIG4 ;

[0027] FIG6 shows a schematic structural diagram of the valve core component of the drain valve provided in the second embodiment of the present application when it is in the first limit position;

[0028] FIG7 shows a schematic structural diagram of the valve core component of the drain valve provided in the second embodiment of the present application when it is in the second limit position;

[0029] FIG8 shows a schematic structural diagram of the cooperation between the valve core component, the first spring and the second spring according to the second embodiment of the present application;

[0030] FIG9 is a schematic structural diagram of a drain valve provided in Example 3 of the present application when the valve core component is in a first limit position;

[0031] FIG10 shows a cross-sectional view of the drain valve provided by the third embodiment of the present application when the valve core component is in the first limit position;

[0032] FIG11 shows a cross-sectional view of the drain valve provided by the third embodiment of the present application when the valve core component is in the second limit position;

[0033] FIG12 shows a schematic structural diagram of a valve core component provided in Example 3 of the present application;

[0034] FIG13 shows a schematic structural diagram of another valve core component provided in Example 3 of the present application;

[0035] FIG14 shows a schematic structural diagram of the valve core component, the first spring, and the second spring in accordance with the third embodiment of the present application;

[0036] FIG15 shows a schematic structural diagram of a drain valve provided in a fourth embodiment of the present application;

[0037] FIG16 shows a schematic structural diagram of the valve core component provided in the fourth embodiment of the present application when it is in the first extreme position;

[0038] FIG17 shows a schematic structural diagram of the valve core component provided in the fourth embodiment of the present application when it is in the second extreme position;

[0039] FIG18 shows a schematic structural diagram of the valve core component provided in the fifth embodiment of the present application when it is in the first extreme position;

[0040] FIG19 shows a schematic structural diagram of the valve core component provided in the fifth embodiment of the present application when it is in the second extreme position;

[0041] FIG20 shows a schematic structural diagram of a drain valve provided in Example 6 of the present application;

[0042] FIG21 shows a schematic structural diagram of the drain valve provided in the sixth embodiment of the present application when it is in the first limit position;

[0043] FIG22 shows a schematic structural diagram of the drain valve provided in the sixth embodiment of the present application when it is in the second limit position;

[0044] FIG23 shows a schematic structural diagram of the drain valve provided in the seventh embodiment of the present application when it is in the first limit position;

[0045] Figure 24 shows a schematic structural diagram of the drain valve provided in Example 7 of the present application when it is in the second extreme position.

[0046] The above drawings include the following reference numerals: 10, valve body; 101, first opening; 102, flow channel; 103, second opening; 1031, mounting section; 1032, blocking section; 1033, stopper; 104, first mounting groove; 105, second mounting groove; 11, main body; 1101, mounting opening; 111, first protrusion; 112, second protrusion; 12, valve seat; 20, valve core component; 201, first stop structure; 202, second stop structure; 203, first notch; 204, second notch; 205, stopper; 21, valve stem; 211, main body section; 212, connecting section; 22, valve core body; 23, stopper; 30, first spring; 31, first guide section; 32, second guide section; 40. Second spring; 41. Third guide section; 42. Fourth guide section; 50. Sealing element. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] As shown in Figures 1 to 5, a first embodiment of the present application provides a drain valve, which includes a valve body 10 and a valve core component 20. The valve body 10 includes a first opening 101, a circulation channel 102, and a second opening 103 that are sequentially connected. The circulation channel 102 is used to allow fluid to circulate. The first opening 101 and the second opening 103 are respectively located on either side of the circulation channel 102. The first opening 101 and the second opening 103 are arranged opposite each other. That is, in this embodiment, the first opening 101 and the second opening 103 are spaced apart along the circumference of the circulation channel 102, and the first opening 101 and the second opening 103 are coaxially arranged. The first opening 101 is used to discharge the fluid in the circulation channel 102. The first end of the valve core component 20 is set corresponding to the first opening 101, and the second end of the valve core component 20 is set corresponding to the second opening 103, and the valve core component 20 can move relative to the valve body 10 to open and close the first opening 101; wherein, the valve core component 20 has a first extreme position and a second extreme position set relatively. When the valve core component 20 is in the first extreme position, the first end of the valve core component 20 blocks the first opening 101, and the second end of the valve core component 20 blocks the second opening 103. When the valve core component 20 is in the second extreme position, the first end of the valve core component 20 opens the first opening 101.

[0049] The application of the technical solution of the present application can reduce the influence of the pressure difference between the inside and outside of the valve body 10 on the valve opening of the valve core component 20, and ensure the smoothness of the valve opening process of the valve core component 20. Specifically, in the drain valve of this solution, the first opening 101 and the second opening 103 are respectively connected to the circulation channel 102. When the first end of the valve core component 20 blocks the first opening 101, and the second end of the valve core component 20 blocks the second opening 103, the end face of the first end of the valve core component 20 and the end face of the second end of the valve core component 20 are both in the same pressure environment. Such an arrangement can reduce the axial pressure differential force of the valve core component 20 as much as possible, reduce the pressure differential load of the valve core component 20, reduce the pressure differential force overcome by the valve core component 20 in the process of the valve core component 20 opening the first opening 101, and ensure the smoothness of the movement process of the valve core component 20. In the traditional technical solution, one end of the valve core component is completely immersed in the fluid in the valve body, and the other end of the valve core component blocks the drain port. This arrangement allows one end of the valve core component to be in the pressure environment within the flow channel, and the end face of the other end of the valve core component to be in the external pressure environment of the valve body. The smoothness of the movement of the valve core component 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 large, the axial pressure difference force applied to the valve core component is large. Therefore, during the valve opening process, the axial pressure difference force that the valve core component needs to overcome is large, affecting the smoothness of the valve opening. Compared with the traditional technical solution, the arrangement of this solution has a simple structure, and the axial pressure difference force applied to the valve core component 20 is small, which improves the smoothness of the valve opening process.

[0050] Furthermore, the cross-sectional area of ​​the first opening 101 is S1, and the cross-sectional area of ​​the second opening 103 is S2. Such an arrangement can further reduce the influence of the pressure difference between the inside and outside of the valve body 10 on the valve opening of the valve core component 20, thereby ensuring the smoothness of the valve opening process of the valve core component 20.

[0051] Specifically, the cross-sectional area difference between the first opening 101 and the second opening 103 is within a certain range. When the first end of the valve core component 20 blocks the first opening 101 and the second end of the valve core component 20 blocks the second opening 103, the axial pressure differential force on the first end of the valve core component 20 and the second end of the valve core component 20 tends to be balanced, with almost no pressure differential force load, that is, the pressure differential force on the first end of the valve core component 20 and the pressure differential force on the second end of the valve core component 20 almost cancel each other out. When opening the valve, the valve core component 20 almost does not need to overcome the pressure differential force. The valve core component 20 only needs to overcome the friction between the valve body 10, thereby ensuring the smooth operation of the valve core component 20. In addition, in the traditional technical solution, considering the pressure differential inside and outside the valve body, the size of the drain port needs to be designed within a certain range to ensure that the valve core component can open the valve smoothly. Otherwise, the pressure differential inside and outside the valve body is too large, which may cause the valve core component to be unable to open the drain port. However, when the valve core component 20 of the drain valve of this solution opens the first opening 101, there is no need to consider the pressure difference between the inside and outside of the valve body 10. Therefore, there is no need to consider the size of the first opening 101, that is, the drain valve of this solution can achieve large flow discharge.

[0052] Among them, it can be set to or In this embodiment, S1 = S2 , that is, in this embodiment, the diameter of the first opening 101 is D1 , the diameter of the second opening 103 is D2 , and D1 = D2 .

[0053] Among them, when the valve core component 20 is in the second extreme position, the second end of the valve core component 20 can open the second opening 103 or block the second opening 103. This solution does not impose specific restrictions on this and can be designed according to the specific application scenario of the drain valve.

[0054] In this embodiment, when the flow channel 102 is under negative pressure, the second end of the valve core component 20 opens the second opening 103 to balance the pressure between the flow channel 102 and the outside air pressure, ensuring smooth drainage of the drain valve. When the flow channel 102 is under positive pressure, the second end of the valve core component 20 opens the second opening 103 to drain the fluid in the flow channel 102, further increasing the drainage volume of the drain valve.

[0055] As shown in Figures 2 and 3 , the drain valve further includes a first spring 30 and a second spring 40. The first spring 30 and the second spring 40 are both disposed within the valve body 10. The first spring 30 and the second spring 40 provide forces in opposite directions to the valve core component 20 to cause the valve core component 20 to move relative to the valve body 10. One of the first spring 30 and the second spring 40 is a memory alloy spring.

[0056] In the embodiment of the present application, the first spring 30 is a memory alloy spring. Specifically, the first spring 30 is capable of sensing changes in the temperature of the fluid within the valve body 10. When the temperature of the fluid within 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; when the first spring contracts, the second spring 40 extends. The first spring 30 and the second spring 40 work together to drive the valve core component 20 to move. The arrangement of the first spring 30 and the second spring 40 offers a simple structure and a long service life. Furthermore, the first spring 30 rapidly senses the temperature of the fluid within the valve body 10, ensuring the valve core component 20 maintains high sensitivity in opening and closing the valve.

[0057] Furthermore, because the cross-sectional areas of the first opening 101 and the second opening 103 are nearly equal, the valve core component 20 hardly needs to overcome a pressure differential force when opening the valve, ensuring a smooth valve opening process. Furthermore, the valve core component 20 can be driven to switch between the first and second extreme positions with only a small force provided by the first and second springs 30, 40. Therefore, the spring force of the first and second springs 30, 40 can be appropriately reduced, which reduces the difficulty of manufacturing the first and second springs 30, 40 and the wire diameter of the first and second springs 30, 40. When the wire diameter of the first spring 30 is reduced, the sensitivity of the first spring 30 is increased, the response speed is faster, and the accuracy of the valve opening of the valve core component 20 is improved.

[0058] In addition, when the cross-sectional areas of the first opening 101 and the second opening 103 are close, the pressure difference force that the valve core component 20 needs to 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 specification can be suitable for drain valves with large openings, thereby improving the versatility of the first spring 30.

[0059] Among them, in other embodiments of the present scheme, the drain valve may include a temperature bulb and a second spring 40, both of which are arranged in the valve body 10. The temperature bulb is used to sense the temperature of the fluid in the valve body 10. When the fluid temperature changes, the temperature bulb deforms and cooperates with the second spring to drive the valve core component 20 to move.

[0060] In this embodiment, the second spring 40 and the first spring 30 are spaced apart and sleeved on the valve core component 20 along the axis of the valve core component 20. The first end of the first spring 30 abuts the valve core component 20, and the second end of the first spring 30 abuts the inner wall of the valve body 10. The first end of the second spring 40 abuts the inner wall of the valve body 10, and the second end of the second spring 40 abuts the valve core component 20. This arrangement ensures convenient assembly of the second spring 40 and the first spring 30 with the valve core component 20.

[0061] This solution does not limit the specific positions of the second spring 40 and the first spring 30 , wherein the second spring 40 can be arranged close to the first opening 101 or close to the second opening 103 . In this embodiment, the second spring 40 is arranged close to the first opening 101 .

[0062] Furthermore, the drain valve also includes a first axial limiting structure and a second axial limiting structure. The first axial limiting structure is disposed between the valve core component 20 and the first spring 30 and is used to limit movement of the first end of the first spring 30 relative to the valve core component 20 in a direction from the second opening 103 to the first opening 101. The second axial limiting structure is disposed between the valve body 10 and the first spring 30 and is used to limit movement of the second end of the first spring 30 relative to the valve body 10 in a direction from the first opening 101 to the second opening 103.

[0063] When assembling the first spring 30, the first spring 30 is sleeved onto the valve core component 20 so that the first end of the first spring 30 engages with the first axial limiting structure. The valve core component 20 and the first spring 30 are then assembled into the valve body 10 so that the second axial limiting structure limits the second end of the first spring 30. This arrangement facilitates assembly of the drain valve.

[0064] As shown in Figures 2 to 5, the valve core component 20 specifically includes a first stop structure 201. The first end of the first spring 30 engages with the first stop structure 201, forming a first axial limit structure. In this embodiment, the valve core component 20 includes a valve stem 21, a valve core body 22, and a stop portion 23. Two valve core bodies 22 are provided, one at each end of the valve stem 21, corresponding to the first opening 101 and the second opening 103, respectively. The stop portion 23 is provided on the circumference of the valve stem 21. Along the axis of the valve stem 21, the stop portion 23 is located in the middle of the valve stem 21 and has a first stop surface and a second stop surface disposed opposite each other. The first spring 30 is sleeved on the valve stem 21 and is located on the side of the first stop surface away from the second stop surface. The first stop surface engages with the first end of the first spring 30.

[0065] The present invention does not limit the specific shape and number of the stopper 23, wherein a plurality of stoppers 23 may be provided at intervals along the circumference of the valve stem 21. In this embodiment, only one stopper 23 is provided, and the stopper 23 is annularly provided on the outer circumference of the valve stem 21.

[0066] The present invention does not limit the specific connection method between the stopper 23 and the valve stem 21, and the stopper 23 and the valve stem 21 can be connected by clamping, welding or fasteners. In this embodiment, the stopper 23 and the valve stem 21 are integrally formed.

[0067] 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 circulation channel 102. One end of the first mounting groove 104 communicates with the second opening 103, and the other end of the first mounting groove 104 communicates with the circulation channel 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 distal from the second spring 40 is disposed within the first mounting groove 104 and engages with a stopper in the first mounting groove 104, forming a second axial limit structure. In this embodiment, the first mounting groove 104 is coaxially disposed with the second opening 103, and the valve core component 20 is disposed within the first mounting groove 104. The provision of the first mounting groove 104 provides a simple structure and facilitates processing.

[0068] Furthermore, the drain valve also includes a third axial limiting structure and a fourth axial limiting structure. The third axial limiting structure is disposed between the valve body 10 and the second spring 40 and is used to limit movement of the first end of the second spring 40 relative to the valve body 10 in the direction from the second opening 103 to the first opening 101. The fourth axial limiting structure is disposed between the valve core component 20 and the second spring 40 and is used to limit movement of the second end of the second spring 40 relative to the valve core component 20 in the direction from the first opening 101 to the second opening 103. This arrangement facilitates installation of the assembled valve core component 20, first spring 30, and second spring 40 into the valve body 10.

[0069] Specifically, after the first spring 30 and the valve core component 20 are assembled, the second spring 40 is sleeved on the valve core component 20 so that the second end of the second spring 40 is limited and matched with the fourth axial limiting structure; then, the assembled valve core component 20, the first spring 30 and the second spring 40 are installed into the valve body 10, ensuring that the third axial limiting structure is limited and matched with the first end of the second spring 40, and the second axial limiting structure limits the second end of the first spring 30.

[0070] The valve core component 20 includes a second stop structure 202 . One end of the second spring 40 close to the first spring 30 is engaged with the second stop structure 202 , and the second stop structure 202 forms a fourth axial limiting structure.

[0071] In this embodiment, the second stop surface of the stop portion 23 forms a second stop structure 202. The second spring 40 is sleeved onto the valve stem 21 and located on the side of the second stop surface away from the first stop surface. This arrangement minimizes the axial dimension of the valve core component 20, ensuring a compact drain valve. Furthermore, this arrangement facilitates the processing and molding of the valve core component 20.

[0072] Among them, this solution does not limit the specific position of the stopper 23 on the valve stem 21, and it can be set according to actual working conditions.

[0073] Furthermore, a second mounting groove 105 is provided on the inner wall of the valve body 10, and the second mounting groove 105 is arranged between the first opening 101 and the circulation channel 102. One end of the second mounting groove 105 is connected to the first opening 101, and the other end of the second mounting groove 105 is connected to the circulation channel 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 away from the first spring 30 is inserted into the second mounting groove 105 and cooperates with the stopper of the second mounting groove 105. The second mounting groove 105 forms a third axial limiting structure.

[0074] In this embodiment, the second installation groove 105 is coaxially arranged with the first opening 101, and the valve core component 20 is inserted into the second installation groove 105. The arrangement of the second installation groove 105 has a simple structure and is easy to process.

[0075] In this embodiment, there is no restriction 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 circulation channel 102. This arrangement ensures that a sufficient length of the first spring 30 is located within the circulation channel 102, ensuring the first spring 30's sensing speed to the fluid temperature, ensuring the sensitivity of the first spring 30, and ensuring the driving accuracy of the valve core component 20.

[0076] In this embodiment, when the valve core component 20 is in the first limit position, the first end of the valve core component 20 extends through the first opening 101 and blocks the first opening 101. When the valve core component 20 switches from the first limit position to the second limit position, the valve core component 20 moves from the first opening 101 to the second opening 103, thereby opening the first opening 101. Specifically, a first spring 30 that expands and contracts with heat is used. The valve-opening water temperature 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 component 20 moves 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 extends, the spring force of the first spring 30 becomes greater than the spring force of the second spring 40, and the valve core component 20 moves from the second opening 103 to the first opening 101, thereby closing the valve.

[0077] Furthermore, a second notch 204 is provided on the circumferential surface of the second end of the valve core component 20. When the valve core component 20 is in the first extreme position, the second end of the valve core component 20 is inserted into the second opening 103 and blocks the second opening 103. The second notch 204 is located in the first mounting groove 104. When the valve core component 20 switches from the first extreme position to the second extreme position, at least part of the second notch 204 is located in the second opening 103. A second flow channel for fluid circulation is formed between the second opening 103 and the second notch 204. The second flow channel is connected to the circulation channel 102 through the first mounting groove 104 to discharge the fluid in the circulation channel 102.

[0078] This embodiment does not limit the specific form and shape of the second notch 204, wherein a plurality of second notches 204 may be spaced apart along the circumference of the valve core component 20. In this embodiment, only one second notch 204 is provided, and the second notch 204 is annularly arranged on the circumference of the valve core component 20. Both ends of the second opening 103 are chamfered. Along the axial direction, the spacing between the two oppositely arranged side walls of the second notch 204 gradually increases from the center to the edge, so that the second notch 204 matches the second opening 103. Such a configuration facilitates the flow of fluid.

[0079] 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 circulation channel 102, and a second opening 103. The mounting opening 1101 communicates with the circulation channel 102. The valve seat 12 is separate from the main body 11 and is positioned at the mounting opening 1101. The valve seat 12 has the first opening 101. In this embodiment, the valve seat 12 is threadedly connected to the mounting opening 1101. This arrangement facilitates assembly of the main body 11 and the valve seat 12.

[0080] Specifically, the main body 11 includes a first protrusion 111 and a second protrusion 112. The first and second protrusions 111, 112 are spaced apart along the circumference of the main body 11. The first protrusion 111 extends in the same direction as the radial direction of the main body 11, and the first and second protrusions 111, 112 are coaxially arranged. The mounting opening 1101 is provided on the first protrusion 111, and the second opening 103 is provided on the second protrusion 112. This arrangement enables the valve body 10 to be miniaturized in radial dimensions.

[0081] As shown in FIG6 to FIG8 , the second embodiment of the present application provides a drain valve, which differs from the first embodiment in that:

[0082] No second notch 204 is provided on the circumference of the second end of the valve core component 20, and a first notch 203 is provided on the circumference of the first end of the valve core component 20. When the valve core component 20 is in the first extreme position, the first end of the valve core component 20 is penetrated into the first opening 101 and blocks the first opening 101, at least part of the first notch 203 is located on the side of the first opening 101 close to the circulation channel 102, and the second end of the valve core component 20 is penetrated into the second opening 103; when the valve core component 20 switches from the first extreme position to the second extreme position, the valve core component 20 moves in the direction from the second opening 103 to the first opening 101, the first notch 203 is located in the first opening 101, and a first flow channel for fluid circulation is formed between the first opening 101 and the first notch 203. The first flow channel is connected to the circulation channel 102 through the second mounting groove 105. The second end of the valve core component 20 is separated from the second opening 103, and the second opening 103 is connected to the circulation channel 102 through the first mounting groove 104. Specifically, a first spring that shrinks when heated and expands when cooled is used, and the valve-opening water temperature is set to 0-3°C. When the water temperature drops to this temperature range, the first spring 30 extends, the spring force of the second spring 40 becomes less than that of the first spring 30, and the valve core component 20 moves from the second opening 103 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 first spring 30 becomes less than that of the second spring 40, and the valve core component 20 moves from the first opening 101 to the second opening 103, thereby closing the valve.

[0083] This embodiment does not limit the specific form and shape of the first notch 203, wherein a plurality of first notches 203 may be spaced apart along the circumference of the valve core component 20. In this embodiment, there is one first notch 203, and the first notch 203 is annularly arranged on the circumference of the valve core component 20. Both ends of the first opening 101 are chamfered, and along the axial direction, the spacing between the two oppositely arranged side walls of the first notch 203 gradually increases from the center to the edge, so that the first notch 203 matches the first opening 101. Such a configuration can facilitate the flow of fluid.

[0084] As shown in Figures 9 to 11, a third embodiment of the present application provides a drain valve, which includes a valve body 10, a valve core component 20, and a first spring 30. The valve body 10 includes a first opening 101, a circulation channel 102, and a second opening 103 that are sequentially connected. The circulation channel 102 is used to allow fluid to circulate. The second opening 103 and the first opening 101 are respectively located on either side of the circulation channel 102. The second opening 103 and the first opening 101 are arranged relative to each other. That is, in this embodiment, the second opening 103 and the first opening 101 are spaced apart along the circumference of the circulation channel 102, and the second opening 103 and the first opening 101 are arranged coaxially. The second opening 103 is used to discharge the fluid in the circulation channel 102. The second end of the valve core component 20 is arranged corresponding to the second opening 103, and the first end of the valve core component 20 is arranged corresponding to the first opening 101. The valve core component 20 can move relative to the valve body 10 to open and close the second opening 103.

[0085] In which, the valve core component 20 has a first extreme position and a second extreme position relatively set. When the valve core component 20 is in the first extreme position, the second end of the valve core component 20 blocks the second opening 103, and the first end of the valve core component 20 blocks the first opening 101; when the valve core component 20 is in the second extreme position, the first end of the valve core component 20 opens the first opening 101, and the second end of the valve core component 20 opens the second opening 103.

[0086] Specifically, the second opening 103 includes a mounting section 1031 and a blocking section 1032, which are connected in sequence. The mounting section 1031 is located on the side of the blocking section 1032 that is closer to the flow channel 102, and the diameter of the mounting section 1031 is smaller than that of the blocking section 1032. The second end of the valve core component 20 can block or open the blocking section 1032. The first spring 30 is sleeved on the valve core component 20 and is used to provide a force to the valve core component 20 to block or open the blocking section 1032. The first end of the first spring 30 is connected to the valve core component 20, and the second end of the first spring 30 is located within the mounting section 1031.

[0087] By applying the technical solution of the present application, the diameter of the mounting section 1031 is smaller than the diameter of the blocking section 1032, the second end of the valve core component 20 blocks or opens the blocking section 1032, and the mounting section 1031 is used to accommodate the end of the first spring 30, and the diameter of the mounting section 1031 is smaller than the diameter of the blocking section 1032. With this arrangement, the size of the first spring 30 is not limited by the diameter of the blocking section 1032, and it only needs to adapt to the diameter of the mounting section 1031, thereby reducing the diameter of the first spring 30 and the size of the valve body 10 as much as possible, thereby reducing the cost of the drain valve.

[0088] Specifically, when the drain valve is in use, it needs to be assembled between two pipes. When the valve core component 20 opens the second opening 103, the fluid in the circulation channel 102 flows through the installation section 1031 to the blocking section 1032 and is discharged from the drain valve. In the traditional technical solution, an opening and an assembly groove for accommodating the end of the spring are provided on the valve body. The valve core component is used to block or open the opening. The assembly groove is connected to the opening in a stepped manner, and the diameter of the assembly groove is larger than the diameter of the opening. When the size of the opening is larger, the size of the assembly groove needs to be increased accordingly to form a stepped surface with the opening, and the end of the spring abuts against the stepped surface. However, the above arrangement will increase the size of the valve body and the size of the spring, resulting in an increase in the cost of the drain valve.

[0089] Compared with the traditional technical solution, in this solution, the second opening 103 is arranged in the form of an installation section 1031 and a blocking section 1032 that are interconnected. The valve core component 20 blocks or opens the blocking section 1032. The installation section 1031 is used to accommodate the end of the first spring 30. The diameter of the installation section 1031 is smaller than the diameter of the blocking section 1032. With this arrangement, the diameter of the installation section 1031 can be made smaller so that the end of the first spring 30 can be embedded in the installation section 1031.

[0090] That is, the setting of this solution makes the diameter of the first spring 30 not limited by the size of the blocking section 1032. When the diameter of the blocking section 1032 is large, the radial size of the first spring 30 can be miniaturized, thereby reducing the size of the valve body 10 and reducing the cost of the drain valve.

[0091] As shown in Figures 10 and 11, specifically, the drain valve also includes a limiting portion 1033, which is arranged in the second opening 103 and located between the blocking section 1032 and the installation section 1031. The end face of the second end of the first spring 30 abuts against the side of the limiting portion 1033 away from the blocking section 1032.

[0092] In this embodiment, the mounting section 1031, the limiting portion 1033, and the blocking section 1032 are sequentially arranged along the axis of the second opening 103. That is, the limiting portion 1033 divides the second opening 103 into the mounting section 1031 and the blocking section 1032, which are spaced apart and communicate with each other, thereby ensuring that the diameter of the blocking section 1032 is larger than that of the mounting section 1031. The end surface of the second end of the first spring 30 abuts against the side of the limiting portion 1033 that is away from the blocking section 1032. This arrangement ensures the stability of the first spring 30.

[0093] This embodiment does not limit the specific number of limiting portions 1033. Multiple limiting portions 1033 may be provided. When multiple limiting portions 1033 are provided, they are spaced apart along the circumference of the first opening on the sidewalls of the first opening. A gap is formed between the inner sidewalls of the limiting portions 1033 and the sidewalls of the valve core component 20, and a gap for fluid flow is formed between adjacent limiting portions 1033. This arrangement ensures smooth fluid flow.

[0094] In this embodiment, the limiting portion 1033 and the valve body 10 are an integrally formed structure. This arrangement can ensure the stability of the connection between the limiting portion 1033 and the valve body 10 and ensure the convenience of processing.

[0095] In this embodiment, the limiting portion 1033 is annularly disposed on the sidewall of the second opening 103 along the circumference of the second opening 103, and a flow channel for fluid circulation is formed between the inner sidewall of the limiting portion 1033 and the sidewall of the valve core component 20. This arrangement further ensures convenient processing of the limiting portion 1033 and the valve body 10, and ensures a sufficient contact area between the limiting portion 1033 and the first spring 30, thereby ensuring the stability of the first spring 30.

[0096] Furthermore, the valve core component 20 includes a limiting structure 205, which is used to cooperate with the stopper of the limiting portion 1033 to limit the movement of the valve core component 20. The setting of the limiting structure 205 can prevent the valve core component 20 from over-opening or over-closing the valve, thereby ensuring the accuracy of opening or closing the valve.

[0097] In this embodiment, a stepped structure is provided on the valve core component 20. The stepped structure is located on the side of the limiting portion 1033 away from the mounting section 1031. The stepped structure is configured to abut and cooperate with the side of the limiting portion 1033 away from the mounting section 1031, thereby forming the limiting structure 205. The provision of the stepped structure is simple in structure and easy to implement.

[0098] As shown in Figures 10 to 14, the valve core component 20 includes a valve stem 21 and a valve core body 22, which are arranged sequentially from the installation section 1031 to the blocking section 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 sleeved on the valve stem 21, and one end of the valve stem 21 is inserted into the installation section 1031. The valve core body 22 is used to block or open the blocking section 1032. A stepped structure is formed between the valve core body 22 and the valve stem 21.

[0099] This solution does not limit the specific connection method between the valve core body 22 and the valve stem 21, wherein the valve core body 22 and the valve stem 21 can be set as an integrally formed structure or as a separate structure.

[0100] In this embodiment, the valve core body 22 and the valve stem 21 are provided with a separate structure. Such a configuration can facilitate the processing of the valve core body 22 and the valve stem 21 and facilitate the assembly with the first spring 30 .

[0101] In this embodiment, the valve stem 21 includes a main section 211 and a connecting section 212 that are stepped along the axial direction. The diameter of the connecting section 212 is smaller than the diameter of the main section 211. A connecting hole is provided on the valve core body 22. The connecting hole is provided through the valve core body 22 along the axial direction of the valve core body 22. The connecting section 212 is inserted into the connecting hole. The stepped surface between the connecting section 212 and the main section 211 cooperates with the end face stop of the valve core body 22.

[0102] As shown in Figures 12 and 13 , in this embodiment, the valve core body 22 and the valve stem 21 can be welded or riveted. When the valve core body 22 and the valve stem 21 are riveted together, a relief groove is provided on the end surface of the connecting section 212 away from the main section 211. The connecting section 212 at the location corresponding to the relief groove is bent outward and riveted to the end surface of the valve core body 22.

[0103] As shown in Figures 10, 11 and 14, the first spring 30 further includes a first guide section 31 and a second guide section 32 arranged in sequence along the direction from the installation section 1031 to the blocking section 1032. The diameter of the second guide section 32 is larger than the diameter of the first guide section 31. The second guide section 32 is located within the installation section 1031 and the outer side wall of the second guide section 32 is in a guiding fit with the installation section 1031. The first guide section 31 is in a clearance fit with the valve core component 20. This arrangement can further ensure the stability of the first spring 30, prevent the first spring 30 from bending or tilting during the expansion and contraction process, ensure the smoothness and uniformity of the force applied to the valve core component 20, and ensure the stability of the movement of the valve core component 20. In addition, this solution configures the first spring 30 into a tower-shaped structure, which can avoid adding additional positioning components.

[0104] The drain valve further includes a second spring 40, which is sleeved on the valve core component 20. The first end of the second spring 40 is connected to the valve body 10, and the second end of the second spring 40 is connected to the valve core component 20. The second spring 40 and the first spring 30 provide opposing forces to the valve core component 20, and the second spring 40 and the first spring 30 cooperate to drive the valve core component 20 to move. One of the second spring 40 and the first spring 30 is a memory alloy spring. The provision of the memory alloy spring has a simple structure and can directly contact the fluid in the circulation channel 102, ensuring sensitivity when driving the valve core component 20.

[0105] In this embodiment, the valve core component 20 further includes a stopper 23, which is annularly arranged on the sidewall of the valve stem 21 along the circumference of the valve stem 21. The first spring 30 and the second spring 40 are respectively located on either side of the stopper 23. The end of the first spring 30 proximate to the second spring 40 abuts one side of the stopper 23, while the end of the second spring 40 proximate to the first spring 30 abuts the other side of the stopper 23. This arrangement ensures convenient assembly of the first spring 30 and the second spring 40. In this embodiment, the first spring 30 is a memory alloy spring.

[0106] This solution does not limit the specific positions of the first spring 30 and the second spring 40 , wherein the first spring 30 can be set to correspond to the second opening 103 , or the second spring 40 can be set to correspond to the second opening 103 . In this embodiment, the first spring 30 is set to correspond to the second opening 103 .

[0107] In this embodiment, the maximum diameter of the first spring 30 is different from the maximum diameter of the second spring 40. This arrangement can facilitate the identification of the first spring 30 and the second spring 40, and avoid the situation where the first spring 30 and the second spring 40 are installed reversely.

[0108] In the embodiment of this solution, when the valve core component 20 is in an extreme position, the first end of the valve core component 20 blocks the first opening 101, the second end of the valve core component 20 blocks the blocking section 1032, and the stepped structure of the valve core component 20 abuts and cooperates with the side of the limit portion 1033 away from the mounting section 1031 to limit the movement of the valve core component 20 and prevent the valve core component 20 from over-closing. When the valve core component 20 is in the second extreme position, the blocking section 1032 is in an open state, and the first opening 101 is in an open state.

[0109] In the drain valve of this scheme, when the circulation channel 102 is in a positive pressure state, the second opening 103 and the first opening 101 can be used as drain outlets at the same time to ensure the drainage volume and drainage speed of the drain valve; when the circulation channel 102 is in a negative pressure state, one of the second opening 103 and the first opening 101 can be used as a drain outlet, and the other can be used as an air inlet. This arrangement can ensure that the circulation channel 102 is connected to the outside world, thereby ensuring the drainage effect of the drain valve.

[0110] In this embodiment, the first opening 101 serves as a drain port, and the second opening 103 serves as an air inlet. When the first opening 101 drains water, the second opening 103 takes in air. Even if the cross-sectional area of ​​the intake channel is smaller than that of the drainage channel, the intake speed can still meet the requirements.

[0111] In this embodiment, the cross-sectional area of ​​the first opening 101 is the same as the cross-sectional area of ​​the blocking section 1032. The valve core component 20 includes two valve core bodies 22, which are symmetrically arranged at the ends of the valve stem 21. Both valve core bodies 22 are separately provided from the valve stem 21. Alternatively, one valve core body 22 and the valve stem 21 may be integrally formed, while the other valve core body 22 is separate from the valve stem 21. The cross-sectional area of ​​the first opening 101 is the same as the cross-sectional area of ​​the blocking section 1032. This arrangement ensures that the second opening 103 is in a blocked state. When the first opening 101 is in the blocked state, the valve core component 20 achieves internal balance, ensuring smooth valve opening.

[0112] As shown in Figures 10, 11, and 14, the valve body 10 is further provided with a second mounting groove 105. The second mounting groove 105 is disposed between the circulation channel 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 sidewall 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 is in stepped communication with the first opening 101. The provision of the second mounting groove 105 further ensures the stability of the second spring 40.

[0113] In this embodiment, the second spring 40 includes a third guide section 41 and a fourth guide section 42, which are arranged in sequence. The diameter of the third guide section 41 is larger than that of the fourth guide section 42, which is also larger than the diameter of the second guide section 32 of the first spring 30. The outer wall of the third guide section 41 is in a guiding engagement with the second mounting groove 105, while the fourth guide section 42 is in a clearance engagement with the valve stem 21. The end of the fourth guide section 42, which is distal to the third guide section 41, is in a stop engagement with the side of the stop portion 23 distal to the first spring 30. This arrangement further ensures the stability of the second spring 40, prevents or reduces bending or tilting of the second spring 40 during expansion and contraction, ensures the stability and uniformity of the force applied by the second spring 40 to the valve core component 20, and ensures the stability of the movement of the valve core component 20.

[0114] As shown in Figures 9 to 11, the valve body 10 further includes a main body 11 and a valve seat 12. The circulation channel 102 and the second opening 103 are both provided on the main body 11. The main body 11 is also provided with a mounting port 1101, which is located on the side of the circulation channel 102 and is opposite to the second opening 103. The first opening 101 and the second mounting groove 105 are both provided on the valve seat 12. The valve seat 12 is provided at the mounting port 1101 and is threadedly connected to the main body 11. This arrangement ensures convenient assembly of the drain valve.

[0115] By applying the technical solution of the present application, the diameter of the mounting section 1031 is smaller than the diameter of the blocking section 1032, the second end of the valve core component 20 blocks or opens the blocking section 1032, and the mounting section 1031 is used to accommodate the end of the first spring 30, and the diameter of the mounting section 1031 is smaller than the diameter of the blocking section 1032. With this arrangement, the size of the first spring 30 is not limited by the diameter of the blocking section 1032, and it only needs to adapt to the diameter of the mounting section 1031, thereby reducing the diameter of the first spring 30 and the size of the valve body 10 as much as possible, thereby reducing the cost of the drain valve.

[0116] The valve core component 20 is configured as a separate valve stem 21 and valve core body 22, which facilitates the assembly of the first spring 30 and the second spring 40 with the valve core component 20. The maximum diameter of the first spring 30 is different from the maximum diameter of the second spring 40. This configuration facilitates the identification of the first spring 30 and the second spring 40, and prevents the first spring 30 and the second spring 40 from being installed reversely.

[0117] As shown in Figures 15 to 17, a fourth embodiment of the present application provides a drain valve, which includes a valve body 10, a valve core component 20, and a first spring 30. The valve body 10 includes a first opening 101 and a circulation channel 102, which are interconnected. The circulation channel 102 is used to allow fluid to circulate. The first opening 101 is provided on the side of the circulation channel 102 and is used to discharge the fluid within the circulation channel 102. The valve core component 20 is movable relative to the valve body 10, and the first end of the valve core component 20 is used to open or block the first opening 101. The first spring 30 is provided within the valve body 10 and is a memory alloy spring. The first spring 30 is driven and connected to the valve core component 20 to open or block the first opening 101. When the valve core component 20 blocks the first opening 101, at least half of the length of the first spring 30 is located within the circulation channel 102 along the expansion and contraction direction of the first spring 30.

[0118] By applying the technical solution of the present application, by arranging at least half of the length of the first spring 30 in the circulation channel 102, it can be ensured that when the drain valve is working, at least half of the length of the first spring 30 is immersed in the flowing fluid, so that the first spring 30 can more accurately sense the temperature of the fluid, ensure the sensing speed of the first spring 30, ensure the accuracy of the first spring 30 driving the valve core component 20 to move, and ensure the accuracy of valve opening.

[0119] Specifically, when the drain valve is operating, it is installed between two water pipes, and the fluid fills the entire flow channel 102. At least half of the length of the first spring 30 is immersed in the flowing fluid. The first spring 30 can directly sense temperature changes in the fluid, avoiding the influence of ambient temperature on the temperature sensed by the first spring 30. This allows for more precise valve opening and reduces or avoids accidental drainage. In conventional technical solutions, the temperature sensing element is located at the drain outlet but does not extend into the flow channel, or the length of the element extending into the flow channel is too short. The temperature sensing element primarily senses the temperature at the drain outlet. However, when the ambient temperature differs significantly from the temperature inside the drain valve, there is often a temperature difference between the temperature at the drain outlet and the temperature inside the flow channel, resulting in low accuracy in the temperature sensing element's sensing of the fluid in the flow channel and low valve opening accuracy. Compared with the traditional technical solution, in this solution, at least half of the length of the first spring 30 is arranged in the circulation channel 102, which can ensure that when the fluid fills the entire circulation channel 102, at least half of the length of the first spring 30 is immersed in the flowing fluid. Such a setting can make the temperature of most of the first spring 30 highly consistent with the temperature of the fluid in the circulation channel 102, reduce the impact of the ambient temperature on the temperature of the first spring 30, ensure the first spring 30's sensing speed of the fluid in the circulation channel 102, improve the speed and accuracy of the first spring 30 driving the valve core component 20, and ensure the speed and accuracy when opening the valve.

[0120] As shown in Figures 16 and 17, further, the valve body 10 also includes a second opening 103, the second opening 103 is connected to the circulation channel 102, and the second opening 103 and the first opening 101 are arranged opposite to each other; the valve core component 20 has a first extreme position and a second extreme position that are arranged opposite to each other. When the valve core component 20 is in the first extreme position, the first end of the valve core component 20 blocks the first opening 101, and the second end of the valve core component 20 blocks the second opening 103; when the valve core component 20 is in the second extreme position, the first opening 101 is in an open state, and the second opening 103 is in an open state. When the circulation channel 102 is in a negative pressure state, the second opening 103 can be used as an air inlet. The above setting can enable the circulation channel 102 to communicate with the external gas through the second opening 103 to balance the air pressure of the circulation channel 102 and the external air pressure, thereby ensuring the smooth discharge of the fluid; when the circulation channel 102 is in a positive pressure state, the second opening 103 can be used as a liquid discharge port. The above setting can increase the discharge volume of the circulation and ensure the smooth discharge of the fluid.

[0121] Furthermore, the drain valve includes a second spring 40 disposed within the valve body 10 and drivingly connected to the valve core component 20. The second spring 40 and the first spring 30 provide forces in opposite directions to the valve core component 20. The first spring 30 and the second spring 40 cooperate to drive the valve core component 20 to move. The drain valve of this embodiment can sense the temperature of the fluid in the pipeline and open the first opening 101 and the second opening 103 when the fluid temperature changes within a certain range.

[0122] Specifically, the first spring 30 senses changes in the temperature of the fluid within the valve body 10. When the temperature of the fluid within the valve body 10 changes, the first spring 30 expands or contracts. When the first spring 30 expands, the second spring 40 is compressed; when the first spring 30 contracts, the second spring 40 expands. The first and second springs 30, 40 work together to drive the valve core component 20. The arrangement of the first and second springs 30, 40 offers a simple structure and a long service life. Furthermore, the first spring 30 quickly senses the temperature of the fluid within the valve body 10, ensuring the valve core component 20 maintains high sensitivity in opening and closing the valve.

[0123] As shown in Figures 16 and 17, further, the first spring 30 and the second spring 40 are spaced apart and sleeved on the valve core component 20 along the axial direction of the valve core component 20; the first end of the first spring 30 abuts against the valve core component 20, and the second end of the first spring 30 abuts against the valve body 10; the first end of the second spring 40 abuts against the valve body 10, and the second end of the second spring 40 abuts against the valve core component 20. Such an arrangement can ensure the convenience of assembling the second spring 40 and the first spring 30 with the valve core component 20. This solution does not limit the specific positions of the second spring 40 and the first spring 30, wherein the second spring 40 can be arranged near the first opening 101 or near the second opening 103. In this embodiment, the second spring 40 is arranged near the first opening 101.

[0124] Furthermore, the valve body 10 includes a first mounting groove 104 disposed on the inner wall of the valve body 10 and communicating with the flow channel 102. The second end of the first spring 30 is embedded in the first mounting groove 104 and engages with a stop in the first mounting groove 104. The provision of the first mounting groove 104 serves as a limit stop for the first spring 30, ensuring its stability.

[0125] This solution does not limit the specific shape of the first mounting groove 104. The first mounting groove 104 can be annular and arranged outside 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 circulation channel 102. The first mounting groove 104 has a circular cross-section and is coaxial with the second opening 103. The diameter of the first mounting groove 104 is larger than that of the second opening 103. In other words, the valve core component 20 is inserted into the first mounting groove 104. This configuration ensures convenient machining of the first mounting groove 104 and convenient assembly of the first spring 30.

[0126] Specifically, the first mounting groove 104 extends in the same direction as the radial direction of the circulation channel 102, and the radius R of the circulation channel 102 is greater than the depth d of the first mounting groove 104. When the valve core component 20 blocks the first opening 101, the length of the first end of the first spring 30 extending from the first mounting groove 104 along the radial direction of the circulation channel 102 is greater than the radius of the circulation channel 102. This arrangement ensures that at least half of the length of the first spring 30 is located within the circulation channel 102 and immersed in the fluid in the circulation channel 102.

[0127] As shown in Figures 16 and 17 , the valve body 10 further includes a second mounting groove 105 disposed on the inner wall of the valve body 10 and communicating with the flow channel 102. The first end of the second spring 40 is embedded in the second mounting groove 105 and engages with a stop in the second mounting groove 105. The provision of the second mounting groove 105 serves as a limit stop for the first end of the second spring 40, ensuring the stability of the second spring 40.

[0128] This solution does not limit the specific structure of the second installation groove 105 , wherein the second installation groove 105 can be set to be annular, and the annular shape is set on the outer periphery of the first opening 101 .

[0129] 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 port 1101, and a circulation channel 102. The mounting port 1101 is in communication with the circulation channel 102. The mounting port 1101 and the first mounting groove 104 are both located on the side of the circulation channel 102. The first mounting groove 104 and the mounting port 1101 are oppositely disposed, coaxially with each other, and the axial direction of the first mounting groove 104 is aligned with the radial direction of the circulation channel 102. The second opening 103 is located on the side of the first mounting groove 104 away from the circulation channel 102. The valve seat 12 is separate from the main body 11, with the valve seat 12 located at the mounting port 1101 and the first opening 101 located on the valve seat 12.

[0130] Furthermore, the main body 11 includes a first raised portion 111 and a second raised portion 112. These are spaced apart along the circumference of the main body 11. Both the first and second raised portions 111, 112 project outward from the main body 11, and the first raised portion 111 extends in the same radial direction as the main body 11. The first and second raised portions 111, 112 are coaxially arranged. The mounting opening 1101 is provided on the first raised portion 111, and the second opening 103 is provided on the second raised portion 112. This arrangement enables miniaturization of the radial dimensions of the valve body 10.

[0131] In this embodiment, the valve seat 12 includes a first section and a second section that are connected in a stepped manner along the axial direction. The diameter of the first section is smaller than that of the second section. The first section is inserted into the mounting opening 1101 and is threadedly connected to the body 11. The stepped surface formed by the second and first sections abuts and mates with the end surface of the first protrusion 111 that is distal to the second protrusion 112. This arrangement facilitates assembly of the valve seat 12 and the body 11.

[0132] Furthermore, a second mounting groove 105 is provided on the valve seat 12. The second mounting groove 105 communicates with the first opening 101 along the axis of the valve seat 12. The second mounting groove 105 is coaxial with the first opening 101, and the cross-sectional area of ​​the second mounting groove 105 is greater than the cross-sectional area of ​​the first opening 101. The second mounting groove 105 communicates with the circulation channel 102. When the second spring 40 is longer, while ensuring that the first spring 30 of sufficient length is located within the circulation channel 102, the depth of the second mounting groove 105 needs to be increased to accommodate the second spring 40. In this case, only the axial dimensions of the first protrusion 111 and the axial dimensions of the valve seat 12 need to be changed, thereby improving the adaptability of the drain valve of this embodiment. Furthermore, the above arrangement facilitates the processing and forming of the second mounting groove 105.

[0133] As shown in Figures 15 to 17, the valve core component 20 specifically includes a valve stem 21, a valve core body 22, and a stopper 23. Two valve core bodies 22 are provided, one at each end of the valve stem 21, and the other corresponding to the first opening 101 and the second opening 103. The stopper 23 is provided on the circumferential surface of the valve stem 21. The first spring 30 and the second spring 40 are both sleeved on the valve stem 21 and are located on either side of the stopper 23. The first end of the first spring 30 engages with the stopper 23, and the second end of the second spring 40 engages with the stopper 23. This arrangement facilitates assembly of the first spring 30, the second spring 40, and the valve core component 20.

[0134] The present invention does not limit the specific shape and number of the stopper 23, wherein a plurality of stoppers 23 may be provided at intervals along the circumference of the valve stem 21. In this embodiment, only one stopper 23 is provided, and the stopper 23 is annularly provided on the outer circumference of the valve stem 21.

[0135] In this solution, two groups of stoppers 23 may be spaced apart along the axial direction of the valve stem 21 , one group cooperating with the first end stop of the first spring 30 , and the other group cooperating with the second end stop of the second spring 40 .

[0136] The present invention does not limit the specific connection method between the stopper 23 and the valve stem 21, and the stopper 23 and the valve stem 21 can be connected by clamping, welding or fasteners. In this embodiment, the stopper 23 and the valve stem 21 are integrally formed.

[0137] This solution does not limit the specific form of the valve core component 20 opening the first opening 101 and the second opening 103.

[0138] As shown in Figure 16, in this embodiment, a notch structure is provided on the circumferential surface of the first end of the valve core component 20. When the valve core component 20 is in the first extreme position, the first end of the valve core component 20 is passed through the first opening 101 and blocks the first opening 101. The notch structure is located in the second mounting groove 105, and the second end of the valve core component 20 is passed through the second opening 103 and blocks the second opening 103.

[0139] The opening water temperature of the drain valve of this embodiment is 0-3°C. When the water temperature reaches this range, the spring force of the first spring 30 is greater than the spring force of the second spring 40, the first spring 30 extends, the second spring 40 contracts, and the valve core component 20 moves in the direction from the second opening 103 to the first opening 101 until the notch structure is located in the first opening 101, and a channel for fluid circulation is formed between the notch structure and the first opening 101; at the same time, the second end of the valve core component 20 is separated from the second opening 103, and a gap for fluid circulation is formed between the end face of the second end of the valve core component 20 and the end face of the second opening 103 close to the first opening 101, thereby achieving valve opening; when the water temperature is higher than 3-5°C, the first spring 30 contracts, the spring force of the second spring 40 is greater than the spring force of the first spring 30, and the valve core component 20 moves in the direction from the first opening 101 to the second opening 103, thereby achieving valve closing.

[0140] The drain valve of this solution directly senses the temperature of the fluid through the first spring 30, with a fast sensing speed. At least half of the length of the first spring 30 is immersed in the fluid, which can further ensure the sensing accuracy of the first spring 30 and the valve opening accuracy. In addition, the drain valve of this solution controls the first opening 101 and the second opening 103 through a valve core component 20. It has a simple structure, reliable operation, fast response speed, and long service life. The drain valve of this solution can be used in both negative pressure and positive pressure conditions, and has strong adaptability. In addition, the drain valve of this solution is relatively easy to assemble.

[0141] As shown in Figures 18 and 19, the drain valve provided in Example 5 of the present application is different from that in Example 4 in that the notch structure is arranged on the circumferential surface of the second end of the valve core component 20, and when the valve core component 20 is in the first extreme position, the notch structure is located in the first mounting groove 104.

[0142] The opening water temperature of the drain valve of this embodiment is 0~3℃. When the water temperature reaches this range, the first spring 30 contracts, the spring force of the first spring 30 is less than the spring force of the second spring 40, the second spring 40 extends, and the valve core component 20 moves in the direction from the first opening 101 to the second opening 103 until the notch structure is located in the second opening 103, and a channel for fluid circulation is formed between the notch structure and the second opening 103. At the same time, the first end of the valve core component 20 is separated from the first opening 101, and a gap for fluid circulation is formed between the end face of the first end of the valve core component 20 and the end face of the end of the first opening 101 close to the second opening 103, thereby opening the valve; when the water temperature is higher than 3~5℃, the first spring 30 extends, the spring force of the second spring 40 is less than the spring force of the first spring 30, and the second spring 40 contracts the valve core component 20 to move in the direction from the second opening 103 to the first opening 101, thereby closing the valve.

[0143] As shown in Figures 20 to 22, Example 6 of the present application provides a drain valve, which includes a valve body 10 and a valve core component 20. The valve body 10 includes a first opening 101, a circulation channel 102, and a second opening 103 that are connected in sequence. The circulation channel 102 is used for fluid circulation. The first opening 101 and the second opening 103 are respectively located on both sides of the circulation channel 102, that is, the first opening 101 and the second opening 103 are spaced apart along the circumference of the circulation channel 102, and the first opening 101 and the second opening 103 are arranged opposite to each other. The first end of the valve core component 20 is arranged corresponding to the first opening 101, and the second end of the valve core component 20 is arranged corresponding to the second opening 103. When the first end of the valve core component 20 blocks the first opening 101, the second end of the valve core component 20 blocks the second opening 103. The valve core component 20 can move relative to the valve body 10 to open the first opening 101 and the second opening 103 synchronously. Among them, the valve core component 20 has a first extreme position and a second extreme position which are relatively set. When the valve core component 20 is in the first extreme position, the first opening 101 and the second opening 103 are both in a blocked state. When the valve core component 20 is in the second extreme position, the first opening 101 and the second opening 103 are both in an open state.

[0144] By applying the technical solution of the present application, by providing a second opening 103 connected to the circulation channel 102, when the first opening 101 drains water, the circulation channel 102 can be connected to the outside world through the second opening 103, thereby avoiding or reducing the poor drainage smoothness caused by the circulation channel 102 being in a negative pressure state and the excessive pressure difference between the inside and outside of the valve body 10.

[0145] Specifically, when in use, the drain valve is set between two pipes, and the two ends of the circulation channel 102 are connected to the two pipes respectively. When drainage is not required, the valve core component 20 is in the first extreme position, so that the first opening 101 and the second opening 103 are both in a blocked state; when drainage is required, the valve core component 20 is in the second extreme position, so that the first opening 101 and the second opening 103 are both in an open state. At this time, the fluid in the valve body 10 is discharged through the first opening 101, and the circulation channel 102 is connected to the outside world through the second opening 103 to ensure that the pressure in the circulation channel 102 is consistent with the external air pressure, thereby ensuring the smooth discharge of the fluid. In the traditional technical solution, only one drain port is set on the valve body. When the circulation channel is in a negative pressure state and the pressure difference between the inside and outside of the valve body is large, the fluidity of the fluid in the circulation channel is poor, which affects the smoothness of drainage. Compared to conventional solutions, this solution allows the drain valve's circulation channel 102 to communicate with the outside world through the second opening 103 when under negative pressure, thereby balancing the air pressure inside and outside the valve body 10 and ensuring smooth fluid flow. Furthermore, when the drain valve's circulation channel 102 is under positive pressure, the second opening 103 acts as a drain port to discharge the fluid within the circulation channel 102, increasing the drain valve's drainage capacity. Furthermore, this solution utilizes the same valve core component 20 to control both the first opening 101 and the second opening 103, resulting in a simpler structure and more reliable operation.

[0146] Furthermore, while the first end of the valve core component 20 opens the first opening 101, the second end of the valve core component 20 opens the second opening 103. This arrangement allows the first opening 101 and the second opening 103 to be controlled by the same valve core component 20 and to open synchronously, making drainage and air intake control more synchronized and precise, ensuring the stability of the drain valve operation. When the second opening 103 serves as the air intake and the first opening 101 serves as the drain, their opening and closing are related to the temperature of the fluid within the valve, not the pressure within the valve, eliminating the risk of low-pressure leakage at the air intake.

[0147] Furthermore, the first end of the valve core component 20 blocks the first opening 101 while the second end of the valve core component 20 blocks the second opening 103. The above arrangement can further ensure the synchronization and accuracy of drainage and air intake control, and ensure the stability of the drainage valve operation.

[0148] Furthermore, the first opening 101 includes a first annular sealing surface, and the first end of the valve core component 20 includes a second annular sealing surface. When the first end of the valve core component 20 blocks the first opening 101, the first annular sealing surface and the second annular sealing surface are sealed together. The second opening 103 includes a third annular sealing surface, and the second end of the valve core component 20 includes a fourth annular sealing surface. When the second end of the valve core component 20 blocks the second opening 103, the third annular sealing surface and the fourth annular sealing surface are sealed together. When the first annular sealing surface and the second annular sealing surface are separated, the third annular sealing surface and the fourth annular sealing surface are separated. This arrangement enables the first opening 101 and the second opening 103 to be opened synchronously.

[0149] As shown in Figures 21 and 22, specifically, a notch structure is provided on the circumference of the valve core component 20. When the valve core component 20 is in the first extreme position, 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 component 20 switches from the first extreme position to the second extreme position, the valve core component 20 moves in the direction from one of the openings to the other opening corresponding to the notch structure. At least part of the notch structure is located in the opening corresponding to the notch structure. A flow channel for fluid circulation is formed between the notch structure and the corresponding opening, and the flow channel is connected to the circulation channel 102. The provision of the notch structure enables the same valve core component 20 to simultaneously control the first opening 101 and the second opening 103.

[0150] The structural strength of the valve core component 20 corresponding to the notch structure is relatively low. When the valve core component 20 is in the first extreme position, the notch structure is located between the first opening 101 and the second opening 103, which can prevent the notch structure from being exposed to the outside of the valve body 10, and avoid the valve core component 20 from colliding with external objects and causing the valve core component 20 to break, thereby ensuring the service life of the valve core component 20.

[0151] The notch structures may be provided in one or two groups along the axial direction of the valve core component 20. When there are two groups of notch structures, the two groups of notch structures are provided corresponding to the first opening 101 and the second opening 103, respectively.

[0152] As shown in FIG. 21 and FIG. 22 , in this embodiment, a group of notch structures are provided along the axial direction of the valve core component 20 , and the notch structures are provided corresponding to the first openings 101 . When the valve core component 20 is in the first extreme position, the second end of the valve core component 20 is inserted into the second opening 103 and blocks the second opening 103, and the first end of the valve core component 20 is inserted into the first opening 101 and blocks the first opening 101, and the notch structure is located on the side of the first opening 101 close to the circulation channel 102; when the valve core component 20 switches from the first extreme position to the second extreme position, the valve core component 20 moves in the direction from the second opening 103 to the first opening 101, and the second end of the valve core component 20 disengages from the second opening 103, and the end face of the second end of the valve core component 20 and the end face of the second opening 103 close to the first opening 101 have a gap for fluid circulation, at least part of the notch structure is located in the first opening 101, and a first flow channel for fluid circulation is formed between the first opening 101 and the notch structure, and the first flow channel is connected to the circulation channel 102.

[0153] This embodiment does not limit the specific form and shape of the notch structure, wherein a plurality of notch structures may be arranged at intervals along the circumference of the valve core component 20 .

[0154] In this embodiment, a notch structure is provided, and the notch structure is arranged in a circumferential ring along the circumference of the valve core component 20 on the circumferential surface of the valve core component 20. Chamfers are provided at both ends of the first opening 101, and along the axial direction, the spacing between the two oppositely arranged side walls of the notch structure gradually increases from the center to the edge, so that the notch structure matches the first opening 101. Such a setting can facilitate the circulation of fluid.

[0155] Specifically, in this embodiment, the axial dimension of the first opening 101 is the same as the axial dimension of the second opening 103. When the valve core component 20 is in the first extreme position, the first end of the valve core component 20 is inserted into the first opening 101 and blocks the first opening 101, and the end surface of the first end of the valve core component 20 is almost flush with the end surface of the first opening 101 away from the second opening 103, and the end surface of the end of the notch structure away from the second opening 103 is almost flush with the end surface of the first opening 101 near the second opening 103; the second end of the valve core component 20 is inserted into the second opening 103 and blocks the second opening 103, and the end surface of the second end of the valve core component 20 is almost flush with the end surface of the second opening 103 away from the first opening 101. With this arrangement, when the valve core component 20 moves from the second opening 103 to the first opening 101, the first opening 101 and the second opening 103 are opened simultaneously.

[0156] Furthermore, the drain valve also includes a communication groove, which is arranged between the circulation channel 102 and the opening corresponding to the notch structure. One end of the communication groove is connected to the circulation channel 102, and the other end of the communication groove is connected to the flow channel for fluid circulation.

[0157] 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 is connected to the circulation channel 102, and the other end of the second mounting groove 105 is connected to the first flow channel. The provision of the second mounting groove 105 facilitates the connection between the first flow channel and the circulation channel 102.

[0158] Specifically, the connecting groove is coaxially arranged with the opening corresponding to the notch structure, and the cross-sectional area of ​​the connecting groove is larger than the cross-sectional area of ​​the opening corresponding to the notch structure. In this embodiment, the second mounting groove 105 is steppedly connected to the first opening 101, the second mounting groove 105 is coaxially arranged with the first opening 101, and the diameter of the second mounting groove 105 is larger than the diameter of the first opening 101. During specific assembly, the valve core component 20 is inserted into the second mounting groove 105, and the space between the second mounting groove 105 and the side wall of the valve core component 20 forms a channel for fluid circulation. The second mounting groove 105 is provided with a simple structure and is easy to form.

[0159] 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 disposed within the valve body 10. They apply opposing forces to the valve core component 20, respectively. The first spring 30 and the second spring 40 cooperate to drive the valve core component 20 to move. One of the first spring 30 and the second spring 40 is a memory alloy spring. The drain valve of this embodiment can sense the temperature of the fluid in the pipeline and, when the fluid temperature changes within a certain range, open the first opening 101 to drain the fluid from the pipeline. The first spring 30 senses changes in the fluid temperature within the valve body 10. When the temperature of the fluid within 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; when the first spring 30 contracts, the second spring 40 extends. The first spring 30 and the second spring 40 work together to drive the valve core component 20 to move. The arrangement of the first spring 30 and the second spring 40 has a simple structure and a long service life. In addition, the first spring 30 can quickly sense the temperature of the fluid in the valve body 10, thereby ensuring the sensitivity of the valve core component 20 in opening and closing the valve.

[0160] Among them, in other embodiments of the present scheme, the drain valve may include a temperature bulb and a second spring 40, both of which are arranged in the valve body 10. The temperature bulb is used to sense the temperature of the fluid in the valve body 10. When the fluid temperature changes, the temperature bulb deforms and cooperates with the return spring to drive the valve core component 20 to move.

[0161] As shown in Figures 21 and 22, in this solution, the first spring 30 and the second spring 40 are spaced apart and sleeved on the valve core component 20 along the axial direction of the valve core component 20; the first end of the first spring 30 abuts the valve core component 20, and the second end of the first spring 30 abuts the inner wall of the valve body 10; the first end of the second spring 40 abuts the inner wall of the valve body 10, and the second end of the second spring 40 abuts the valve core component 20. This arrangement can ensure the convenience of assembling the second spring 40 and the first spring 30 with the valve core component 20. This solution does not limit the specific positions of the second spring 40 and the first spring 30, wherein the second spring 40 can be arranged near the first opening 101 or near the second opening 103. In this embodiment, the second spring 40 is arranged near the first opening 101.

[0162] 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 is engaged with the stopper of the second spring 40. This arrangement can ensure the stability of the second spring 40 in contact with the valve body 10.

[0163] Furthermore, in this embodiment, the valve body 10 also includes a first mounting groove 104, which is arranged on the inner wall of the valve body 10, and the first mounting groove 104 is located on the side of the second opening 103 close to the circulation channel 102, and the first mounting groove 104 is connected to the second opening 103 in a stepped manner, and the diameter of the first mounting groove 104 is larger than the diameter of the second opening 103, and the second end of the first spring 30 is passed through the first mounting groove 104 and cooperates with the stopper of the first mounting groove 104. The setting of the first mounting groove 104 has a simple structure and is easy to process and form.

[0164] Specifically, the valve core component 20 includes a valve stem 21, a valve core body 22, and a stopper 23. Two valve core bodies 22 are provided, one at each end of the valve stem 21, corresponding to the first opening 101 and the second opening 103, respectively. The stopper 23 is provided on the circumference of the valve stem 21. The first spring 30 and the second spring 40 are both sleeved on the valve stem 21 and located on either side of the stopper 23. The first end of the first spring 30 engages with the stopper 23, and the second end of the second spring 40 engages with the stopper 23. This arrangement facilitates assembly of the first spring 30, the second spring 40, and the valve core component 20.

[0165] The present invention does not limit the specific shape and number of the stopper 23, wherein a plurality of stoppers 23 may be provided at intervals along the circumference of the valve stem 21. In this embodiment, only one stopper 23 is provided, and the stopper 23 is annularly provided on the outer circumference of the valve stem 21.

[0166] In this solution, two groups of stoppers 23 may be spaced apart along the axial direction of the valve stem 21 , one group cooperating with the first end stop of the first spring 30 , and the other group cooperating with the second end stop of the second spring 40 .

[0167] The present invention does not limit the specific connection method between the stopper 23 and the valve stem 21, and the stopper 23 and the valve stem 21 can be connected by clamping, welding or fasteners. In this embodiment, the stopper 23 and the valve stem 21 are integrally formed.

[0168] As shown in Figures 21 and 22, the valve body 10 specifically includes a main body 11 and a valve seat 12. The main body 11 has a mounting opening 1101, a circulation channel 102, and a second opening 103. The mounting opening 1101 is provided on a sidewall of the main body 11 and communicates with the circulation channel 102. The mounting opening 1101 and the second opening 103 are disposed opposite each other. The valve seat 12 is separate from the main body 11 and is disposed at the mounting opening 1101. The first opening 101 and the second mounting groove 105 are both provided on the valve seat 12. The first opening 101 and the second mounting groove 105 are connected in a stepped manner along the axis of the valve seat 12. The end of the second mounting groove 105, away from the first opening 101, is configured to communicate with the circulation channel 102. This arrangement facilitates assembly of the drain valve.

[0169] When assembling the drain valve, after assembling the valve core component 20, the first spring 30 and the second spring 40, the assembled whole can be assembled into the interior of the valve body 10 through the installation port 1101, so that the second end of the valve core component 20 is inserted into the second opening 103, and the second end of the first spring 30 is inserted into the first installation groove 104; then, the valve seat 12 is assembled to the main body 11 through the installation port 1101, so that the first end of the second spring 40 is inserted into the second installation groove 105, and the first end of the valve core component 20 is inserted into the first opening 101.

[0170] Specifically, the valve seat 12 is threadedly connected to the body 11 through the mounting opening 1101. The drain valve also includes a seal 50, which is disposed between the body 11 and the valve seat 12 to seal the gap between the body 11 and the valve seat 12. The threaded connection facilitates assembly of the body 11 and the valve seat 12, and the provision of the seal 50 ensures a tight seal between the body 11 and the valve seat 12.

[0171] As shown in Figures 20 to 22, the main body 11 specifically includes a first protrusion 111 and a second protrusion 112. These protrusions 111 and 112 are spaced apart along the circumference of the main body 11. Both the first and second protrusions 111 and 112 project outward from the main body 11, extending in the same direction as the radial direction of the main body 11. The first and second protrusions 111 and 112 are coaxially arranged. The mounting opening 1101 is provided on the first protrusion 111, and the second opening 103 is provided on the second protrusion 112. This arrangement minimizes the radial dimensions of the valve body 10.

[0172] In this embodiment, the valve seat 12 comprises a first section and a second section connected in a stepped manner along the axial direction. The diameter of the first section is smaller than that of the second section. The first section is inserted into the mounting opening 1101 and threadedly connected to the main body 11. The stepped surface formed by the second and first sections abuts and mates with the end surface of the first protrusion 111 distal from the second protrusion 112. The seal 50 is annularly disposed at the junction of the first and second sections. This arrangement ensures convenient assembly of the valve seat 12, seal 50, and main body 11.

[0173] In this drain valve, when the flow channel 102 is under negative pressure, it can communicate with the outside world through the second opening 103, thereby balancing the air pressure inside and outside the valve body 10 and ensuring smooth fluid flow. This drain valve allows for simultaneous intake and drainage, making drainage and intake control more synchronized and precise, ensuring stable operation. The second opening 103 acts as an air inlet, and its opening and closing is dependent on the temperature of the fluid within the valve, not the pressure within the valve, eliminating the risk of low-pressure leakage at the inlet.

[0174] In the drain valve of this embodiment, when the circulation channel 102 is in a positive pressure state, the second opening 103 can be used as a drain port to discharge the fluid in the circulation channel 102, thereby increasing the drainage volume of the drain valve.

[0175] This solution uses the same valve core component 20 to control the first opening 101 and the second opening 103, which has a simpler structure and more reliable operation. The second mounting groove 105 and the first mounting groove 104 are arranged so that the notch structure of the valve core component 20 corresponds to the first opening 101 or the second opening 103, and the first valve core component 20 can simultaneously control the first opening 101 and the second opening 103. That is, when the valve core component 20 is in the first extreme position, the notch structure of the valve core component 20 can be located in the second mounting groove 105 or the first mounting groove 104. This arrangement improves the adaptability of the drain valve of this solution.

[0176] The drain valve of this embodiment is installed between two water pipes and can sense the temperature of the fluid within the pipes. The valve-opening water 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 component 20 moves from the second opening 103 to the first opening 101, and the first opening 101 and the second opening 103 are opened simultaneously. When the water temperature rises above 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 needle moves from the first opening 101 to the second opening 103, and the first opening 101 and the second opening 103 are closed simultaneously.

[0177] As shown in Figures 23 and 24, Example 7 of the present application provides a drain valve, which differs from Example 6 in that the notch structure is arranged corresponding to the second opening 103, the first end of the valve core component 20 is passed through the first opening 101 and blocks the first opening 101, the notch structure is located in the first mounting groove 104, and the second end of the valve core component 20 is passed through the second opening 103 and blocks the second opening 103.

[0178] When the valve core component 20 moves from the first extreme position to the second extreme position, the valve core component 20 moves in the direction from the first opening 101 to the second opening 103, the notch structure is located in the second opening 103, the space between the notch structure and the second opening 103 and the space between the valve core component 20 and the first mounting groove 104 are interconnected and form a channel for fluid circulation, the first end of the valve core component 20 is separated from the first opening 101, and a channel for fluid circulation is formed between the end face of the first end of the valve core component 20 and the end face of one end of the first opening 101 close to the second opening 103.

[0179] The drain valve of this embodiment is installed between two water pipes and can sense the circulating temperature within the water pipes. The valve-opening water 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 the spring force of the first spring 30, and the valve core component 20 moves from the first opening 101 to the second opening 103, opening the first opening 101 and the second opening 103 simultaneously. When the water level is above 3-5°C, the first spring 30 extends, the spring force of the first spring 30 becomes greater than the spring force of the second spring 40, and the valve core component 20 moves from the second opening 103 to the first opening 101, closing the first opening 101 and the second opening 103 simultaneously.

[0180] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0181] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0182] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0183] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0184] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0185] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A drain valve, characterized in that: include: A valve body (10), comprising a first opening (101), a circulation channel (102) and a second opening (103) which are connected in sequence, wherein the circulation channel (102) is used for allowing fluid to circulate, the first opening (101) and the second opening (103) are respectively located on both sides of the circulation channel (102), the first opening (101) and the second opening (103) are arranged opposite to each other, and the first opening (101) is used for discharging the fluid in the circulation channel (102); a valve core component (20), wherein a first end of the valve core component (20) is arranged corresponding to the first opening (101), a second end of the valve core component (20) is arranged corresponding to the second opening (103), and the valve core component (20) can move relative to the valve body (10) to open and close the first opening (101); The valve core component (20) has a first extreme position and a second extreme position that are relatively arranged. When the valve core component (20) is in the first extreme position, the first end of the valve core component (20) blocks the first opening (101), and the second end of the valve core component (20) blocks the second opening (103). When the valve core component (20) is in the second extreme position, the first end of the valve core component (20) opens the first opening (101).

2. The drain valve according to claim 1, characterized in that: The cross-sectional area of ​​the first opening (101) is S1, the cross-sectional area of ​​the second opening (103) is S2, 3. The drain valve according to claim 1, characterized in that: When the valve core component (20) is in the second extreme position, the second end of the valve core component (20) opens the second opening (103).

4. The drain valve according to claim 1, characterized in that: The drain valve also includes: A first spring (30) and a second spring (40) are both arranged in the valve body (10); the first spring (30) and the second spring (40) provide forces in opposite directions to the valve core component (20); and one of the first spring (30) and the second spring (40) is a memory alloy spring.

5. The drain valve according to claim 4, characterized in that: The second spring (40) and the first spring (30) are sleeved on the valve core component (20) at intervals along the axial direction of the valve core component (20); The first end of the first spring (30) abuts against the valve core component (20), and the second end of the first spring (30) abuts against the inner wall of the valve body (10); The first end of the second spring (40) abuts against the inner wall of the valve body (10), and the second end of the second spring (40) abuts against the valve core component (20).

6. The drain valve according to claim 5, characterized in that: The drain valve also includes: a first axial limiting structure, arranged between the valve core component (20) and the first spring (30), the first axial limiting structure being used for limiting the movement of the first end of the first spring (30) relative to the valve core component (20) in a direction from the second opening (103) to the first opening (101); A second axial limiting structure is arranged between the valve body (10) and the first spring (30), and the second axial limiting structure is used to limit the second end of the first spring (30) from moving relative to the valve body (10) in a direction from the first opening (101) to the second opening (103).

7. The drain valve according to claim 6, characterized in that: The valve core component (20) comprises a first stop structure (201), the first end of the first spring (30) is stop-matched with the first stop structure (201), and the first stop structure (201) forms the first axial limiting structure; A first mounting groove (104) is provided on the inner wall of the valve body (10), and the first mounting groove (104) is located between the second opening (103) and the circulation channel (102); one end of the first mounting groove (104) is communicated with the second opening (103), and the other end of the first mounting groove (104) is communicated with the circulation channel (102); the cross-sectional area of ​​the first mounting groove (104) is larger than the cross-sectional area of ​​the second opening (103); one end of the first spring (30) away from the second spring (40) is inserted into the first mounting groove (104) and cooperates with a stopper of the first mounting groove (104); the first mounting groove (104) forms the second axial limiting structure.

8. The drain valve according to claim 5, characterized in that: The drain valve also includes: a third axial limiting structure, arranged between the valve body (10) and the second spring (40), the third axial limiting structure being used to limit the movement of the first end of the second spring (40) relative to the valve body (10) in a direction from the second opening (103) to the first opening (101); A fourth axial limiting structure is arranged between the valve core component (20) and the second spring (40), and the fourth axial limiting structure is used to limit the second end of the second spring (40) from moving relative to the valve core component (20) along the direction from the first opening (101) to the second opening (103).

9. The drain valve according to claim 8, characterized in that: A second mounting groove (105) is provided on the inner wall of the valve body (10), and the second mounting groove (105) is provided between the first opening (101) and the circulation channel (102), one end of the second mounting groove (105) is communicated with the first opening (101), and the other end of the second mounting groove (105) is communicated with the circulation channel (102), the cross-sectional area of ​​the second mounting groove (105) is larger than the cross-sectional area of ​​the first opening (101), and one end of the second spring (40) away from the first spring (30) is inserted into the second mounting groove (105) and cooperates with the stopper of the second mounting groove (105), and the second mounting groove (105) forms the third axial limiting structure; The valve core component (20) includes a second stop structure (202), and one end of the second spring (40) close to the first spring (30) is stop-matched with the second stop structure (202), and the second stop structure (202) forms the fourth axial limiting structure.

10. The drain valve according to claim 1, characterized in that: When the valve core component (20) is in the first limit position, the first end of the valve core component (20) is inserted into the first opening (101) and blocks the first opening (101). When the first limit position is switched to the second limit position, the valve core component (20) moves in the direction from the first opening (101) to the second opening (103) to open the first opening (101); or, A first notch (203) is provided on the circumferential surface of the first end of the valve core component (20); when the valve core component (20) is in the first extreme position, the first end of the valve core component (20) is inserted into the first opening (101) and blocks the first opening (101); the first notch (203) is located on a side of the first opening (101) close to the circulation channel (102); when the valve core component (20) switches from the first extreme position to the second extreme position, the valve core component (20) moves in a direction from the second opening (103) to the first opening (101); at least a portion of the first notch (203) is located in the first opening (101); a first flow channel for fluid circulation is formed between the first opening (101) and the first notch (203); the first flow channel is connected to the circulation channel (102).

11. The drain valve according to claim 1, characterized in that: The valve body (10) comprises: A main body (11) having a mounting opening (1101), the circulation channel (102) and the second opening (103), wherein the mounting opening (1101) is in communication with the circulation channel (102); The valve seat (12) is separately provided from the main body (11); the valve seat (12) is provided at the installation opening (1101); and the valve seat (12) has the first opening (101).

12. The drain valve according to claim 1, characterized in that: The second opening (103) comprises a mounting section (1031) and a blocking section (1032) which are connected in sequence, the mounting section (1031) being located on a side of the blocking section (1032) close to the circulation channel (102), the diameter of the mounting section (1031) being smaller than the diameter of the blocking section (1032), the second end of the valve core component (20) being capable of blocking or opening the blocking section (1032), and the drain valve further comprising: A first spring (30) is sleeved on the valve core component (20), and the first spring (30) is used to provide the valve core component (20) with a force to block or open the blocking section (1032). The first end of the first spring (30) is connected to the valve core component (20), and the second end of the first spring (30) is located in the installation section (1031).

13. The drain valve according to claim 12, characterized in that: The drain valve also includes: A limiting portion (1033) is arranged in the second opening (103) and is located between the blocking section (1032) and the mounting section (1031), and an end surface of the second end of the first spring (30) is abutted against a side of the limiting portion (1033) away from the blocking section (1032).

14. The drain valve according to claim 13, characterized in that: A plurality of the limiting portions (1033) are provided, and the plurality of limiting portions (1033) are arranged on the side wall of the second opening (103) at intervals along the circumferential direction of the second opening (103).

15. The drain valve according to claim 13, characterized in that: The limiting portion (1033) is arranged in an annular shape on the side wall of the second opening (103) along the circumference of the second opening (103), and a flow channel for fluid circulation is formed between the inner side wall of the limiting portion (1033) and the side wall of the valve core component (20).

16. The drain valve according to claim 13, characterized in that: The valve core component (20) comprises a limiting structure (205), and the limiting structure (205) is used to cooperate with the stopper of the limiting portion (1033) to limit the movement stroke of the valve core component (20).

17. The drain valve according to claim 12, characterized in that: The first spring (30) comprises a first guide section (31) and a second guide section (32) which are sequentially arranged along the direction from the mounting section (1031) to the blocking section (1032); the diameter of the second guide section (32) is larger than the diameter of the first guide section (31); the second guide section (32) is located in the mounting section (1031) and the outer side wall of the second guide section (32) is in guiding cooperation with the mounting section (1031); the first guide section (31) is in clearance cooperation with the valve core component (20).

18. The drain valve according to claim 12, characterized in that: The drain valve also includes: a second spring (40), sleeved on the valve core component (20), a first end of the second spring (40) being connected to the valve body (10), a second end of the second spring (40) being connected to the valve core component (20), the second spring (40) and the first spring (30) providing opposite forces to the valve core component (20), the second spring (40) and the first spring (30) cooperating to drive the valve core component (20) to move, and one of the second spring (40) and the first spring (30) being a memory alloy spring; The valve body (10) is also provided with a second mounting groove (105), the second mounting groove (105) is provided between the circulation channel (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 in the second mounting groove (105), and the outer side wall of the first end of the second spring (40) is guided and matched with the second mounting groove (105).

19. The drain valve according to claim 12, characterized in that: The valve core component (20) includes a valve stem (21) and a valve core body (22) which are sequentially arranged along the direction from the installation section (1031) to the blocking section (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 sleeved on the valve stem (21), one end of the valve stem (21) is inserted into the installation section (1031), and the valve core body (22) is used to block or open the blocking section (1032).

20. The drain valve according to claim 1, characterized in that The drain valve also includes: A first spring (30) is arranged in the valve body (10), and the first spring (30) is a memory alloy spring. The first spring (30) is drivingly connected to the valve core component (20) so that the valve core component (20) opens or blocks the first opening (101). When the valve core component (20) blocks the first opening (101), along the expansion and contraction direction of the first spring (30), at least half of the length of the first spring (30) is located in the circulation channel (102).

21. The drain valve according to claim 20, characterized in that: When the valve core component (20) is in the second extreme position, the second end of the valve core component (20) opens the second opening (103).

22. The drain valve according to claim 21, characterized in that The valve body (10) further comprises a first mounting groove (104), wherein the first mounting groove (104) is arranged on the inner wall of the valve body (10), the first mounting groove (104) is connected to the circulation channel (102), and the second end of the first spring (30) is embedded in the first mounting groove (104) and cooperates with a stopper of the first mounting groove (104).

23. The drain valve according to claim 22, characterized in that: The extension direction of the first mounting groove (104) is the same as the radial direction of the circulation channel (102), the radius of the circulation channel (102) is greater than the depth of the first mounting groove (104), and when the valve core component (20) blocks the first opening (101), along the radial direction of the circulation channel (102), the length of the first end of the first spring (30) extending from the first mounting groove (104) is greater than the radius of the circulation channel (102).

24. The drain valve according to claim 1, characterized in that The first opening (101) and the second opening (103) are opened synchronously.

25. The drain valve according to claim 24, characterized in that The first opening (101) comprises a first annular sealing surface, and the first end of the valve core component (20) comprises a second annular sealing surface, and when the first end of the valve core component (20) blocks the first opening (101), the first annular sealing surface and the second annular sealing surface are in sealing cooperation; The second opening (103) includes a third annular sealing surface, and the second end of the valve core component (20) includes a fourth annular sealing surface, and when the second end of the valve core component (20) blocks the second opening (103), the third annular sealing surface and the fourth annular sealing surface are in sealing cooperation; When the first annular sealing surface is separated from the second annular sealing surface, the third annular sealing surface is separated from the fourth annular sealing surface.

26. The drain valve according to claim 24, characterized in that A notch structure is provided on the circumferential surface of the valve core component (20); when the valve core component (20) blocks the first opening (101), the notch structure is located between the first opening (101) and the second opening (103); the notch structure is arranged corresponding to the first opening (101) and / or the second opening (103); When the valve core component (20) moves to open the first opening (101), at least part of the notch structure is located in the first opening (101) and / or the second opening (103), and a flow channel for fluid circulation is formed between the notch structure and the corresponding openings, and the flow channel is connected to the circulation channel (102).

27. The drain valve according to claim 26, characterized in that The drain valve also includes: A connecting groove is arranged between the circulation channel (102) and an opening corresponding to the notch structure, one end of the connecting groove is connected to the circulation channel (102), and the other end of the connecting groove is connected to the flow channel for fluid circulation.

28. The drain valve according to claim 27, characterized in that The connecting groove is coaxially arranged with the opening corresponding to the notch structure, and the cross-sectional area of ​​the connecting groove is larger than the cross-sectional area of ​​the opening corresponding to the notch structure.

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