Valve device and thermal management system

Abstract

The utility model discloses a valve device and a thermal management system, the valve device is applied to the thermal management system, the valve device comprises a valve body, a switch structure and a one-way structure, the valve body is provided with an inlet end and an outlet end, and the inlet end is connected with an internal pipeline of the thermal management system and used for receiving waste liquid; the outlet end is connected with the external environment and is used for discharging waste liquid; a fluid channel is formed between the inlet end and the outlet end; at least part of the switch structure is located in the fluid channel. The one-way structure is arranged in the fluid channel and used for preventing liquid from the external environment from reversely flowing to the switch structure from the outlet end. According to the utility model, the switch structure and the one-way structure are arranged on the valve body connected with the internal pipeline and the external environment of the thermal management system, and the characteristic that the one-way structure prevents external liquid from reversely flowing in from the outlet end is utilized, so that the damage of impurities to internal elements of the thermal management system is avoided, and the stability and the service life of the thermal management system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drainage valve in heat management system, and especially valve device and heat management system. BACKGROUND

[0002] The existing heat management system of new energy vehicle is provided with a switch valve in the drainage pipe, the switch valve is used for controlling the liquid flow in the vehicle drainage system, and the switch valve can be opened or closed when needed, so as to manage the liquid discharge in the vehicle heat management system. However, the current drainage pipe has the problem of backwater, such as when the vehicle passes through the waterlogged road, the waterlogging may enter the internal pipeline through the opening of the drainage pipe. During the backwater process, the waterlogging will flow into the valve body of the switch valve together with the impurities such as road mud and sundries in the valve body. The impurities in the valve body will accumulate more and more in the case of long-time backwater, which will cause the valve body to stop working normally, affect the normal opening and closing of the switch valve, and shorten the service life of the switch valve. SUMMARY

[0003] The utility model discloses a valve device and heat management system to solve the deficiency in the prior art, can reduce the waterlogging and impurities flow into the valve body of valve device, guarantee the normal operation and operation accuracy of valve device, can reduce the influence on the service life of valve device, also can avoid the liquid backflow to heat management system.

[0004] In order to realize one of the above purposes, the utility model provides a valve device, the valve device is applied to heat management system, the valve device includes:

[0005] Valve body, the valve body has import end and export end, the import end is connected with the internal pipeline of heat management system, is used for receiving waste liquid, the export end is connected with external environment, is used for discharging waste liquid, the import end and export end form fluid channel between them,

[0006] Switch structure, at least part of the switch structure is located in the fluid channel, is used for connecting or plugging the fluid channel,

[0007] The valve device further includes:

[0008] One-way structure, the one-way structure is arranged in the fluid channel, and is located between the export end and the switch structure, is used for blocking the liquid from the external environment from the export end to the switch structure.

[0009] As a further improvement of the embodiment of the utility model, the fluid passage has a first valve cavity and a second valve cavity, the valve body has a liquid inlet and a liquid outlet, the first valve cavity is communicated with the liquid inlet, the second valve cavity is communicated with the liquid outlet, at least part of the switch structure is arranged in the first valve cavity to connect or cut off the first valve cavity and the second valve cavity, the valve body includes a liquid outlet pipe, the liquid outlet pipe is communicated with the second valve cavity through the liquid outlet, the one-way structure is arranged in the liquid outlet pipe to block the liquid from flowing from the liquid outlet pipe into the second valve cavity.

[0010] As a further improvement of the embodiment of the utility model, the one-way structure includes a floating ball arranged in the liquid outlet pipe, the floating ball is used to cooperate with the liquid outlet to block the liquid from flowing from the liquid outlet into the second valve cavity.

[0011] As a further improvement of the embodiment of the utility model, the liquid outlet is provided with an arc-shaped matching surface matched with the outer peripheral wall of the floating ball on the side facing the liquid outlet pipe.

[0012] As a further improvement of the embodiment of the utility model, the liquid outlet pipe includes a flow slowing part connected to the valve body and a connecting part connected to the flow slowing part, the connecting part is located at one end of the flow slowing part away from the second valve cavity, the diameter of the flow slowing part is greater than the diameter of the connecting part, and the one-way structure is located in the flow slowing part.

[0013] As a further improvement of the embodiment of the utility model, the connecting part is provided with a grating plate at one end facing the flow slowing part.

[0014] As a further improvement of the embodiment of the utility model, a partition plate is arranged in the valve body to separate the first valve cavity and the second valve cavity, and a liquid discharge hole communicating the first valve cavity and the second valve cavity is arranged on the partition plate.

[0015] The switch structure includes a valve core rotatably arranged in the valve body and a spring sleeved on the valve core, the valve core includes a core column and a core disc connected to the core column, one end of the spring abuts against the valve body, and the other end abuts against the core disc, a flow guide hole is arranged on the core disc, and the core disc has a through position where the flow guide hole is communicated with the liquid discharge hole and a blocking position where the flow guide hole is cut off from the liquid discharge hole in the rotation path of the valve core.

[0016] A sealing gasket is arranged between the core disc and the partition plate, and a through hole matched with the liquid discharge hole is arranged on the sealing gasket.

[0017] As a further improvement of the embodiment of the present application, a limiting hole is arranged on the partition plate, and a through hole matched with the limiting hole is arranged on the sealing gasket, and the core column passes through the through hole and matches with the limiting hole.

[0018] As a further improvement of the embodiment of the present application, the valve body comprises a shell, a valve cover connected to one end of the shell and an end cover connected to the other end of the shell, and the inlet end and the outlet end are arranged on the opposite sides of the shell.

[0019] In order to achieve one of the above purposes, the embodiment of the present application provides a heat management system comprising a liquid discharge pipeline, and the heat management system further comprises the valve device, the inlet end is communicated with the liquid discharge pipeline and is used for receiving waste liquid, and the outlet end is connected with an external environment and is used for discharging waste liquid.

[0020] Compared with the prior art, the present application sets the switch structure and the one-way structure on the valve body connected to the internal pipeline of the heat management system and the external environment, utilizes the characteristic of the one-way structure that prevents external liquid from flowing reversely into the outlet end, effectively prevents the impurities carried by the external liquid from entering the internal pipeline of the heat management system in the case of wading, avoids the damage of the impurities to the internal components of the heat management system (especially to the valve device), and improves the stability and service life of the heat management system.

[0021] In a further scheme, the float ball is used as the one-way structure, which is simple in structure, low in cost, automatically sealed by the buoyancy, does not need additional energy, and is high in reliability; the arc-shaped matching surface, the slow flow part and the grid plate and other structures further improve the sealing effect, stability and reliability of the one-way structure; the switch structure in the form of disc valve controls the opening and closing of the valve through the rotation of the valve core, and the sealing gasket and the limiting structure ensure the sealing property and the action accuracy of the switch structure. The overall valve device is compact in structure, easy to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a sectional view of the valve device provided by the present application;

[0023] Figure 2 is a structural explosion view of the valve device provided by the present application;

[0024] Figure 3 is Figure 2 a detail view of part of the structure, mainly showing the structure of the valve core, the spring and the sealing sheet;

[0025] Figure 4 is Figure 1 an enlarged view of the structure of part A;

[0026] Figure 5is a top view of a part structure of a valve device provided by the utility model.

[0027] Figure 6 is an axonometric view of a connecting part in the valve device provided by the utility model.

[0028] Reference signs:

[0029] 10, valve body; 10a, first valve cavity; 10b, second valve cavity; 11, liquid inlet; 12, liquid outlet; 121, arc-shaped matching surface; 13, liquid inlet pipe; 14, liquid outlet pipe; 141, slow flow part; 142, connecting part; 143, grid plate; 15, partition plate; 151, liquid discharge hole; 152, limiting hole; 17, shell; 18, valve cover; 19, end cover; 20, switch structure; 21, valve core; 211, core column; 212, core disc; 213, flow guide hole; 214, step groove; 215, transmission head; 22, spring; 23, sealing gasket; 231, through hole; 232, perforation; 24, sealing ring; 25, gasket; 30, one-way structure; 31, floating ball; 41, driving disc; 42, transmission groove. DETAILED DESCRIPTION

[0030] The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model and cannot be explained as the limitation of the utility model.

[0031] The terms first, second, etc. in the utility model are only used for the description purpose and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features; in addition, it is to be explained that, unless otherwise explicitly specified and limited, the term "connection" should be understood in a broad sense, for example, the connection can be direct connection or indirect connection through intermediate medium, can be fixed connection or movable connection or detachable connection or integral connection.

[0032] In order to make the person skilled in the art better understand the technical scheme in the utility model, the following will combine the drawings in the embodiment of the utility model to make the description. Figures 1 to 6 The technical scheme in the embodiment of the utility model is clearly and completely described.

[0033] An embodiment of the utility model provides a valve device, the valve device is applied to a thermal management system, referring to Figure 1The valve device comprises a valve body 10, an opening and closing structure 20 and a one-way structure 30, and the opening and closing structure 20 and the one-way structure 30 are arranged in the valve body 10. The valve body 10 has an inlet end and an outlet end, the inlet end is connected with an internal pipeline of a heat management system and is used for receiving waste liquid from the internal pipeline of the heat management system, and the outlet end is connected with an external environment and is used for discharging the waste liquid in the valve body 10.

[0034] A fluid channel is formed between the inlet end and the outlet end. At least part of the opening and closing structure 20 is located in the fluid channel, and the opening and closing structure 20 is used for communicating or blocking the fluid channel. The one-way structure 30 is arranged in the fluid channel and is located between the outlet end and the opening and closing structure 20, and is used for blocking liquid from the external environment from flowing reversely from the outlet end to the opening and closing structure 20.

[0035] The waste liquid in the heat management system flows into the valve body 10 from the inlet end of the valve body 10, the opening and closing structure 20 in the valve body 10 can control the opening and closing of the fluid channel in the valve body 10, and when the opening and closing structure 20 is in an open state, the waste liquid in the valve body 10 can be discharged from the outlet end. The one-way structure 30 in the valve body 10 is configured to limit the external liquid from flowing to the opening and closing structure 20 from the outlet end.

[0036] The valve device provided by the utility model, by setting the opening and closing structure 20 and the one-way structure 30 on the valve body 10 connected with the internal pipeline of the heat management system and the external environment, using the characteristic that the one-way structure 30 prevents the external liquid from flowing reversely into the outlet end, effectively prevents the external liquid from carrying impurities into the internal pipeline of the heat management system in the case of wading and the like, avoids the damage of the impurities to the internal elements of the heat management system, especially can avoid the impurities flowing to the opening and closing structure 20 along with the external liquid, guarantees the operation reliability of the opening and closing structure 20, and improves the stability and service life of the heat management system.

[0037] The core point of the utility model lies in the setting position of the one-way structure 30 and the role played by the one-way structure 30. The one-way structure 30 is arranged between the outlet end and the opening and closing structure 20 and is closer to the external environment. In this way, even if the external liquid enters the valve device, it will be blocked by the one-way structure 30 and cannot reach the opening and closing structure 20, thereby avoiding the influence of the impurities on the opening and closing structure 20.

[0038] The valve body 10 has a liquid inlet 11 and a liquid outlet 12, which are formed on the side wall of the valve body 10. The valve body 10 further comprises a liquid inlet pipe 13 and a liquid outlet pipe 14, the liquid inlet pipe 13 is connected with the liquid inlet 11, and the liquid outlet pipe 14 is connected with the liquid outlet 12. The liquid inlet pipe 13 can be used to connect with the internal pipeline of the thermal management system, so that the waste liquid in the thermal management system flows from the liquid inlet pipe 13 to the inside of the valve body 10. The liquid outlet pipe 14 is used to connect with the external environment, and the waste liquid in the valve body 10 can be discharged to the outside through the liquid outlet pipe 14. The above-mentioned liquid inlet end is the liquid inlet end of the liquid inlet pipe 13, and the liquid outlet end is the liquid outlet end of the liquid outlet pipe 14.

[0039] The fluid channel has a first valve cavity 10a and a second valve cavity 10b, which are spaced apart, and the first valve cavity 10a is connected with the liquid inlet 11, and the second valve cavity 10b is connected with the liquid outlet 12. At least part of the switch structure 20 is arranged in the first valve cavity 10a to connect or cut off the first valve cavity 10a and the second valve cavity 10b. The waste liquid first enters the first valve cavity 10a, and when the switch structure 20 is operated to open, the waste liquid flows from the first valve cavity 10a into the second valve cavity 10b. Through the structural design of the first valve cavity 10a and the second valve cavity 10b, the fluid flow path in the valve device is clear, which is convenient for control.

[0040] The liquid outlet pipe 14 is connected with the second valve cavity 10b through the liquid outlet 12, and the one-way structure 30 is arranged in the liquid outlet pipe 14 to block the liquid flowing from the liquid outlet pipe 14 into the second valve cavity 10b. The one-way structure 30 is arranged in the liquid outlet pipe 14, which can more effectively intercept the backflow liquid. Even if a small part of the liquid backflows into the second valve cavity 10b, the liquid will accumulate at the bottom of the second valve cavity 10b and will not directly enter the first valve cavity 10a, and will not directly contact the switch structure 20, which will not affect the working precision and service life of the valve device.

[0041] It can be understood that the valve device may be installed in an inclined manner due to the actual installation position, but in any installation condition, the second valve cavity 10b can effectively accumulate the liquid, and a small amount of impurities that may exist in the liquid can also be temporarily stored in the second valve cavity 10b and then discharged together with the waste liquid.

[0042] Specifically, the one-way structure 30 refers to a structure in which fluid flows in a single direction under certain conditions. In the present embodiment, the one-way structure 30 is arranged as a floating ball 31 structure.

[0043] Referring to Figure 1 and Figure 4The one-way structure 30 includes a floating ball 31 floatingly arranged in the liquid outlet pipe 14, and the floating ball 31 is used in cooperation with the liquid outlet 12 to block the liquid flowing from the liquid outlet 12 into the second valve cavity 10b. When the liquid from the external environment enters into the liquid outlet pipe 14, the liquid flows in the direction of the liquid outlet 12, and a first fluid pressure F1 is generated on the floating ball 31, the first fluid pressure F1 acts on the floating ball 31, the floating ball 31 moves towards the liquid outlet 12 and blocks the liquid outlet 12, and the liquid in the external environment can be blocked from flowing reversely into the second valve cavity 10b. The floating ball 31 is a hollow spherical structure, which is usually made of polytetrafluoroethylene or silica gel material, and can be lifted with the liquid level. The floating ball 31 is used as the one-way structure 30, which has simple structure, low cost, and high reliability, and can realize automatic blocking and automatic liquid discharge by using buoyancy, without the need of external power source.

[0044] The side of the liquid outlet 12 facing the liquid outlet pipe 14 is provided with an arc-shaped matching surface 121 matched with the outer peripheral wall of the floating ball 31. When the floating ball 31 moves towards the liquid outlet 12 under the action of the first fluid pressure F1, the floating ball 31 cooperates with the arc-shaped matching surface 121 at the position of the liquid outlet 12, the arc-shaped matching surface 121 increases the contact area of the floating ball 31 and the liquid outlet 12, improves the sealing effect, and further prevents the liquid from flowing back.

[0045] In optional embodiments, the one-way structure 30 can also be provided as other structures having the function of limiting the flow direction of the fluid, such as a one-way valve or a one-way membrane, etc. As long as the structure can block the liquid flowing from the liquid outlet pipe 14 to the valve cavity, it is within the protection scope of the present embodiment.

[0046] Referring to Figure 2 and Figure 4 , the liquid outlet pipe 14 includes a flow slowing portion 141 connected to the valve body 10 and a connecting portion 142 connected to the flow slowing portion 141, the connecting portion 142 is located at one end of the flow slowing portion 141 away from the second valve cavity 10b, the diameter of the flow slowing portion 141 is greater than that of the connecting portion 142, and the one-way structure 30 is located in the flow slowing portion 141. The flow slowing portion 141 increases the local volume of the liquid outlet pipe 14, provides a larger space for the floating ball 31 to move, and also has the function of buffering the water flow, slows down the liquid flow rate, reduces the impact on the floating ball 31, and helps the floating ball 31 to block the liquid outlet 12 more stably. The connecting portion 142 facilitates the connection of the liquid outlet pipe 14 with other components.

[0047] The connecting portion 142 and the flow slowing portion 141 can be integrally arranged or separately arranged. As an example, the connecting portion 142 and the flow slowing portion 141 in the present embodiment are separately arranged, and the connecting portion 142 and the flow slowing portion 141 can be fixed by welding or other connection structures. The separately arranged connecting portion 142 and flow slowing portion 141 facilitate the installation and assembly of the one-way structure 30.

[0048] Referring toFigure 4 and Figure 6 The one-way structure 30 is provided with a connecting portion 142, a slow flow portion 141, and a grid plate 143. The connecting portion 142 is connected to the valve body 10, and the slow flow portion 141 is connected to the connecting portion 142. The connecting portion 142 is provided with a stepped mounting groove at one end thereof facing the slow flow portion 141, and the grid plate 143 is fixedly connected in the stepped mounting groove. The grid plate 143 can prevent the floating ball 31 from falling off the liquid outlet pipe 14, and ensure the reliability of the one-way structure 30. During the process of discharging waste liquid from the valve body 10, even if the floating ball 31 moves to the side of the connecting portion 142 under the action of the second fluid pressure F2, the grid plate 143 can limit and intercept the floating ball 31, so that the floating ball 31 will not be engaged at the port position of the connecting portion 142, and the waste liquid can be smoothly discharged. At the same time, the grid plate 143 can also block larger impurities from the outside, and ensure the reliable operation of the one-way structure 30.

[0049] Further, referring to Figure 1 and Figure 5 The valve body 10 is provided with a partition plate 15 for separating the first valve cavity 10a and the second valve cavity 10b, and the partition plate 15 is provided with a liquid discharge hole 151 for communicating the first valve cavity 10a and the second valve cavity 10b. The partition plate 15 separates the first valve cavity 10a and the second valve cavity 10b, so that the two valve cavities form independent fluid spaces. The switch structure 20 is located on the side of the partition plate 15 facing the first valve cavity 10a, and the switch structure 20 cooperates with the liquid discharge hole 151 to realize the opening and closing of the liquid discharge hole 151.

[0050] The switch structure 20 is provided for manual or automatic control of the cut-off of the drain pipe channel by the staff or through the equipment. As an example, the switch structure 20 in the embodiment is an automatic driving structure.

[0051] Referring to Figures 1 to 3 The switch structure 20 includes a valve core 21 rotatably arranged in the valve body 10, and a spring 22 sleeved on the valve core 21. The valve core 21 includes a core column 211 and a core disc 212 connected to the core column 211. One end of the spring 22 abuts against the valve body 10, and the other end abuts against the core disc 212. The core disc 212 is provided with a flow guide hole 213. On the rotation path of the valve core 21, the core disc 212 has a conductive position where the flow guide hole 213 is in communication with the liquid discharge hole 151, and a blocking position where the flow guide hole 213 is cut off from the liquid discharge hole 151. The switch structure 20 is preferably a disc valve. The rotation of the valve core 21 realizes the communication or disconnection of the flow guide hole 213 and the liquid discharge hole 151, thereby controlling the opening and closing of the valve. The spring 22 provides a top abutting force, so that the sealing effect between the valve core 21 and the partition plate 15 is better.

[0052] The edge position of the core disc 212 is inwardly recessed to form an annular stepped groove 214, and the spring 22 is in clamping cooperation with the stepped groove 214, thereby limiting the spring 22.

[0053] A sealing gasket 23 is arranged between the core disc 212 and the partition plate 15, and a through hole 231 matching the liquid discharge hole 151 is arranged on the sealing gasket 23. The sealing gasket 23 improves the sealing between the core disc 212 and the partition plate 15, and prevents liquid from leaking when the valve core 21 is in the closed state.

[0054] The valve device further comprises a transmission structure, which can be a driving disc 41 arranged in rotation. The driving disc 41 can be in transmission connection with an external driving source. The valve core 21 further comprises a transmission head 215 which is integrally connected with the core column 211. The driving disc 41 has a matching portion with a transmission groove 42 matching the transmission head 215. One end of the transmission head 215 extends out of the valve body 10 and is in clamping connection with the transmission groove 42. The cross section of the transmission head 215 is arranged in a polygonal structure, and correspondingly, the cross section of the transmission groove 42 is also arranged in a polygonal structure. When it is needed to control the operation of the switch structure 20, the driving disc 41 is driven to rotate by the external driving source. The driving disc 41 can drive the valve core 21 to rotate through the matching of the transmission groove 42 and the transmission head 215, so as to switch the valve core 21 between the conductive position and the blocking position.

[0055] It should be noted that the transmission head 215 can move in the transmission groove 42 in the axial direction of the valve core 21. Since the core disc 212 needs to be in sealing connection with the sealing gasket 23 and also needs to be arranged to be driven to rotate, a small movable space is reserved between the valve core 21 and the transmission structure in the axial direction of the valve core 21, so that the valve core 21 can be smoothly driven to rotate and can be in sealing connection with other structures of the valve device under the abutting action of the spring 22, so that the valve core 21 can reliably operate.

[0056] The partition plate 15 is provided with a limiting hole 152, and the sealing gasket 23 is provided with a through hole 232 matching the limiting hole 152. The core column 211 passes through the through hole 232 and matches the limiting hole 152. The matching of the limiting hole 152, the through hole 232 and the core column 211 limits the circumferential movement of the valve core 21, ensures the accuracy of the rotation of the valve core 21, and enables the flow guide hole 213 to be accurately aligned or staggered with the liquid discharge hole 151.

[0057] Specifically, the valve body 10 comprises a shell 17, a valve cover 18 connected to one end of the shell 17, and an end cover 19 connected to the other end of the shell 17. The shell 17 is arranged in a cylindrical structure, and the valve cover 18 and the end cover 19 are respectively in sealing connection with the two ends of the shell 17. The liquid inlet pipe 13 is integrally connected with the shell 17, and the slow flow part 141 in the liquid outlet pipe 14 is integrally connected with the shell 17, which simplifies the structure of the valve body 10 and facilitates production and assembly.

[0058] The inlet end and the outlet end are arranged at two opposite sides of the shell 17, that is, the liquid inlet pipe 13 and the liquid outlet pipe 14 are arranged at two opposite sides of the shell 17. The liquid inlet pipe 13 and the liquid outlet pipe 14 arranged at two opposite sides are convenient for pipe connection and installation, and the liquid outlet pipe 14 is arranged at a downstream side of the liquid inlet pipe 13 in the liquid flow direction, so that liquid discharge is more smooth.

[0059] In order to ensure reliable operation of the valve body 10, a sealing ring 24 is arranged at a position where the transmission head 215 cooperates with the valve cover 18, the sealing ring 24 plays a sealing and water isolation role, can seal and block the gap between the transmission head 215 and the valve cover 18, and avoid liquid in the valve body 10 from leaking outward. A gasket 25 is arranged between the spring 22 and the valve cover 18, during rotation of the valve core 21, the gasket 25 can avoid large friction between the spring 22 and the valve cover 18, and ensure the service life of the valve device.

[0060] An embodiment of the utility model provides a kind of heat management system, including liquid discharge pipeline, heat management system further include the valve device as above, the inlet end of valve device is connected with liquid discharge pipeline, for receiving waste liquid in heat management system. The outlet end of valve device is connected with external environment, for discharging waste liquid. The above valve device is applied to heat management system, can directly solve the problem of backwater and impurities in heat management system drain pipeline, protect the stable operation of entire heat management system.

[0061] The above embodiment shown in the drawing illustrates the structure, features and effects of the utility model, and the above description is only the preferred embodiment of the utility model, but the utility model is not limited to the drawing shown, any change or modification according to the concept of the utility model, or equivalent embodiment, as long as it is within the scope of the utility model.

Claims

1. A valve device applied in a thermal management system, the valve device comprising: a valve body (10) having an inlet end and an outlet end, the inlet end being connected to an internal pipeline of the thermal management system for receiving waste liquid, the outlet end being connected to an external environment for discharging waste liquid, a fluid passage being formed between the inlet end and the outlet end; an opening and closing structure (20) at least partially located in the fluid passage for connecting or blocking the fluid passage; characterized in that the valve device further comprises: a one-way structure (30) located in the fluid passage and between the outlet end and the opening and closing structure (20) for blocking liquid from the external environment from flowing reversely from the outlet end to the opening and closing structure (20). the fluid passage has a first valve cavity (10a) and a second valve cavity (10b), the valve body (10) has a liquid inlet (11) and a liquid outlet (12), the first valve cavity (10a) is connected to the liquid inlet (11), the second valve cavity (10b) is connected to the liquid outlet (12), at least part of the opening and closing structure (20) is arranged in the first valve cavity (10a) for connecting or cutting off the first valve cavity (10a) and the second valve cavity (10b), the valve body (10) comprises a liquid outlet pipe (14) connected to the second valve cavity (10b) through the liquid outlet (12), and the one-way structure (30) is arranged in the liquid outlet pipe (14) for blocking liquid from flowing into the second valve cavity (10b) from the liquid outlet pipe (14).

2. The valve device of claim 1, wherein: the one-way structure (30) comprises a floating ball (31) floatingly arranged in the liquid outlet pipe (14), and the floating ball (31) is used for cooperating with the liquid outlet (12) to block liquid from flowing into the second valve cavity (10b) from the liquid outlet (12).

3. The valve device of claim 2, wherein: the liquid outlet (12) is provided with an arc-shaped matching surface (121) matching the outer peripheral wall of the floating ball (31) on the side facing the liquid outlet pipe (14).

4. The valve device of claim 3, wherein: the liquid outlet pipe (14) comprises a flow slowing portion (141) connected to the valve body (10) and a connecting portion (142) connected to the flow slowing portion (141), the connecting portion (142) is located at one end of the flow slowing portion (141) away from the second valve cavity (10b), the diameter of the flow slowing portion (141) is greater than the diameter of the connecting portion (142), and the one-way structure (30) is located in the flow slowing portion (141).

5. Valve device according to claim 2 or 3, characterized in that: the connecting portion (142) is provided with a grid plate (143) on the end facing the flow slowing portion (141).

6. The valve device of claim 5, wherein: the valve body (10) is provided with a partition plate (15) for separating the first valve cavity (10a) and the second valve cavity (10b), and the partition plate (15) is provided with a liquid discharge hole (151) connecting the first valve cavity (10a) and the second valve cavity (10b).

7. The valve device of claim 2, wherein: ​ The switch structure (20) comprises a valve core (21) rotatably arranged in the valve body (10) and a spring (22) sleeved on the valve core (21), the valve core (21) comprises a core column (211) and a core disc (212) connected to the core column (211), one end of the spring (22) abuts against the valve body (10), and the other end abuts against the core disc (212), the core disc (212) is provided with a flow guide hole (213), and the core disc (212) has a conductive position at which the flow guide hole (213) is in communication with the liquid discharge hole (151) and a blocking position at which the flow guide hole (213) is cut off from the liquid discharge hole (151) in the rotation path of the valve core (21). A sealing gasket (23) is arranged between the core disc (212) and the partition plate (15), and the sealing gasket (23) is provided with a through hole (231) matched with the liquid discharge hole (151).

8. The valve device of claim 7, wherein: The partition plate (15) is provided with a limiting hole (152), and the sealing gasket (23) is provided with a perforation (232) matched with the limiting hole (152), and the core column (211) passes through the perforation (232) and cooperates with the limiting hole (152).

9. The valve device of claim 1, wherein: The valve body (10) comprises a shell (17), a valve cover (18) connected to one end of the shell (17) and an end cover (19) connected to the other end of the shell (17), and the inlet end and the outlet end are arranged on the opposite sides of the shell (17).

10. A thermal management system comprising a drain line, characterized by: The heat management system further comprises the valve device according to any one of claims 1-9, the inlet end is in communication with the liquid discharge pipeline and is used for receiving waste liquid, and the outlet end is connected to the external environment and is used for discharging waste liquid.

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