Automatic drain valve

Abstract

The utility model provides an automatic drainage valve, and relates to the technical field of electric pile drainage. The embodiment of the utility model provides an automatic drain valve, comprising: a valve body having a water inlet channel and a drain channel which are communicated with each other, and a sealing surface arranged at the transition position of the water inlet channel and the drain channel; the valve element is movably arranged in the drainage channel, the valve element can be matched with the sealing face to block the water inlet channel, the adapter is partially arranged in the drainage channel, an adjusting spring is arranged between the adapter and the valve element, and thrust close to the water inlet channel is applied to the valve element through the adjusting spring; when the sum of the gravity of the liquid in the water inlet channel and the gravity of the valve element is larger than the thrust of the adjusting spring, the valve element is separated from the sealing face to communicate the water inlet channel with the drainage channel, and the distance between the adapter and the water inlet channel is adjustable to adjust the thrust of the adjusting spring.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cell stack drainage, and in particular to an automatic drainage valve. Background Art

[0002] Fuel cell stacks, as reaction cells for electrochemical reactions, provide electrical energy for fuel cell systems and are key components of fuel cell systems. Electrochemical reactions will generate water vapor in the stack shell, and stack purge will blow air with a certain humidity into the stack shell, etc. The above series of alternating hot and cold media with humidity will eventually increase the water content in the stack shell, eventually causing the water vapor to condense into water droplets, or even the water droplets to gather to form saline-alkali water flows. Except for the end plates, the stack is a conductor. Saline-alkali water, as a conductor, will connect the stack and the shell, the positive and negative electrodes of the stack, etc., causing internal or external short circuits, irreparable damage to the equipment and carriers, and even life-threatening to operators and users.

[0003] Prior art, such as the Chinese patent application with application number CN202221131386.6, discloses a fuel cell system and a fuel cell vehicle, including a stack system, an operating state sensor and a controller, wherein the stack system includes a stack, a drain valve 1 is provided on the anode outlet pipeline of the stack, and a drain valve 2 is also provided on another outlet pipeline of the stack, and the drain valve 1 and the drain valve 2 are both connected to the controller in communication, and the stack is electrically connected to the operating state sensor, and the operating state sensor is connected to the controller in communication, and is used to determine whether there is liquid water inside the fuel cell system, and if it is determined that there is liquid water, the controller controls the drain valve 1 and the drain valve 2 to open at the same time, and if it is determined that there is no liquid water, the controller only controls the drain valve 1 to open. However, it cannot automatically identify whether water is accumulated, and cannot automatically discharge the water. Utility Model Content

[0004] A technical problem to be solved by the present application is that the water accumulated in the existing battery stack shell cannot automatically identify whether there is water in the valve, nor can the water in the valve be automatically discharged.

[0005] To solve the above technical problems, an embodiment of the present application provides an automatic drain valve, including: a valve body, having an inlet channel and a drain channel connected to each other, a sealing surface being provided at the transition between the inlet channel and the drain channel; a valve core, which is movably arranged in the drain channel, the valve core can cooperate with the sealing surface to block the water inlet channel, an adapter, part of which is arranged in the drain channel, an adjusting spring is arranged between the adapter and the valve core, and a thrust is applied to the valve core close to the water inlet channel through the adjusting spring, when the sum of the gravity of the liquid in the water inlet channel and the valve core is greater than the thrust of the adjusting spring, the valve core is separated from the sealing surface to connect the water inlet channel and the drain channel, and the distance of the adapter relative to the water inlet channel is adjustable to adjust the thrust of the adjusting spring.

[0006] In some embodiments, the inner diameter of the water inlet channel is smaller than the inner diameter of the drainage channel, the cross-sectional area of ​​the sealing surface gradually decreases in the direction close to the water inlet channel, and the outer shape of the valve core is a cone that matches the sealing surface. By setting the sealing surface to be a cone, the sealing effect when the valve core contacts the sealing surface is improved.

[0007] In some embodiments, a first sealing ring is provided between the outer wall of the valve core and the sealing surface. By providing the first sealing ring, the sealing effect between the valve core and the sealing surface is increased.

[0008] In some embodiments, the portion of the adapter located in the drainage channel is provided with a first external thread, and the inner wall of the drainage channel is provided with a first internal thread that matches the first external thread. The adapter is sealed and connected to the valve body by thread matching, and the distance between the adapter and the water inlet channel can be adjusted by screwing the adapter in and out, so that the length of the adjustment spring can be controlled in real time, thereby playing a role in controlling the thrust of the adjustment spring.

[0009] In some embodiments, a groove is provided at one end of the adapter close to the valve core, and the portion of the adjusting spring in contact with the adapter is located in the groove. The groove can cooperate with the adjusting spring, thereby reducing the probability of the adjusting spring detaching from the adapter and playing the function of preventing the adjusting spring from detaching.

[0010] In some embodiments, one end of the adapter away from the valve core is located outside the drainage channel and is used to connect with the drainage pipeline, so that the drainage pipeline is connected with the drainage channel through the adapter and the wastewater is discharged in time.

[0011] In some embodiments, the portion of the adapter located outside the drainage channel is threadedly connected to a first nut, and the outer wall of the valve body is threadedly connected to a second nut, the first nut and the second nut have opposite rotation directions, and a lock pin is detachably provided between the first nut and the second nut. The first nut and the second nut with opposite rotation directions cooperate to prevent the adapter of the automatic drainage valve after debugging from being loosened or over-tightened.

[0012] In some embodiments, the outer wall of the water inlet channel is provided with a second external thread, and the second external thread is used for threaded connection with the battery stack housing. By providing the second external thread in the water inlet channel, it is convenient to quickly install the automatic drain valve on the battery stack housing.

[0013] In some embodiments, the outer wall of the valve body is further provided with a flange, and the outer wall of the valve body is sleeved with a second sealing ring located between the flange and the second external thread. By providing the flange, it is convenient to apply a rotating external force to the automatic drain valve through the flange, so that the automatic drain valve can be disassembled and installed relative to the battery stack housing, and the second sealing ring plays a sealing role on the connection.

[0014] In some embodiments, the inner wall of the water inlet end of the water inlet channel is provided with a drainage slope, and the cross-sectional area of ​​the drainage slope gradually increases in the direction away from the water inlet channel. By providing the drainage slope, it is convenient to guide the liquid inside the battery stack into the water inlet channel.

[0015] Through the above technical solution, the automatic drain valve provided by the present application has at least the following beneficial effects:

[0016] The water inlet channel is used to communicate with the battery stack. By arranging an adjusting spring at the lower end of the valve core, when no water is accumulated in the water inlet channel, the gravity of the valve core is less than the thrust of the adjusting spring. By adjusting the spring, the valve core is pressed against the sealing surface to separate the water inlet channel from the drainage channel, thereby preventing external foreign matter, media, organic matter, inorganic matter or organisms harmful to the battery stack from entering the battery stack through the drainage channel and the water inlet channel, thereby improving the risk resistance and dust and water resistance of the battery stack. When a certain weight of water is accumulated in the water inlet channel, the weight of the accumulated water plus the weight of the valve core is greater than the thrust of the spring, the valve core is closed. The core moves downward, the valve core separates from the sealing surface, and the water in the water inlet channel is connected with the drainage channel. At this time, the water in the water inlet channel is discharged through the drainage channel, which realizes the effect of automatically discharging the water generated inside the battery stack, reduces the risk of internal or external short circuit of the battery stack, and improves the safety of operators and users; by adjusting the position of the adapter in the drainage channel, the thrust of the adjusting spring can be adjusted, which can change the threshold of water accumulation in the water inlet channel; the automatic drainage valve is a mechanical component, without energy consumption, and has the effect of independent, automatic and controllable drainage, which improves drainage efficiency and drainage accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1It is a schematic diagram of the exploded structure of the automatic drain valve disclosed in the embodiment of the present application;

[0019] Figure 2 It is a structural schematic diagram of the automatic drain valve disclosed in the embodiment of the present application;

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross section of AA;

[0021] Figure 4 It is a schematic diagram of the automatic drain valve disclosed in the embodiment of the present application installed on the battery stack;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the automatic drain valve according to an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1. Second sealing ring; 2. Valve body; 3. First sealing ring, 4. Valve core; 5. Adjusting spring; 6. Second nut; 7. First nut; 8. Lock pin; 9. Adapter; 10. Water inlet channel; 11. Drain channel; 12. Flange. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0026] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0027] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0029] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0030] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] Figure 1 It is a schematic diagram of the exploded structure of the automatic drain valve disclosed in the embodiment of the present application; Figure 2 It is a structural schematic diagram of the automatic drain valve disclosed in the embodiment of the present application; Figure 3 yes Figure 2 Schematic diagram of the cross section of AA; Figure 4 Schematic diagram of the automatic drain valve disclosed in the embodiment of the present application installed on the battery stack. Figure 4 Two automatic drain valves are installed at the lower end of the battery stack.

[0033] The embodiment of the present application provides an automatic drain valve, including a valve body 2, a valve core 4 and an adapter 9. The valve body 2 has an inlet channel 10 and a drain channel 11 that are interconnected, and a sealing surface is provided at the transition between the inlet channel 10 and the drain channel 11; the valve core 4 is movably arranged in the drain channel 11, and the valve core 4 can cooperate with the sealing surface to block the inlet channel 10, and a portion of the adapter 9 is arranged in the drain channel 11, and an adjusting spring 5 is provided between the adapter 9 and the valve core 4, and a thrust is applied to the valve core 4 to approach the inlet channel 10 through the adjusting spring 5. When the sum of the gravity of the liquid in the inlet channel 10 and the valve core 4 is greater than the thrust of the adjusting spring 5, the valve core 4 is separated from the sealing surface to connect the inlet channel 10 and the drain channel 11, and the distance of the adapter 9 relative to the inlet channel 10 is adjustable to adjust the thrust of the adjusting spring 5.

[0034] The water inlet channel 10 is used to communicate with the battery stack. By setting an adjusting spring 5 at the lower end of the valve core 4, when no water is accumulated in the water inlet channel 10, the gravity of the valve core 4 is less than the thrust of the adjusting spring 5. By adjusting the spring 5, the valve core 4 is pressed against the sealing surface to separate the water inlet channel 10 from the drainage channel 11, which can prevent external foreign matter, medium, organic matter, inorganic matter or organisms harmful to the battery stack from entering the battery stack through the drainage channel 11 and the water inlet channel 10, thereby improving the risk resistance and dust and water resistance of the battery stack. When a certain weight of water is accumulated in the water inlet channel 10, the weight of the accumulated water plus the weight of the valve core 4 is greater than the thrust of the spring. , the valve core 4 moves downward, the valve core 4 is separated from the sealing surface, the water inlet channel 10 and the drainage channel 11 are connected, and the water in the water inlet channel 10 is discharged through the drainage channel 11, so as to realize the effect of automatically discharging the water generated inside the battery stack, reduce the risk of internal or external short circuit of the battery stack, and improve the safety of operators and users; by adjusting the position of the adapter 9 in the drainage channel 11, the thrust of the adjusting spring 5 is adjusted, and the threshold of the accumulated water in the water inlet channel 10 can be changed; the automatic drainage valve is a mechanical component, without energy consumption, and has the effect of independent, automatic and controllable drainage, thereby improving the drainage efficiency and drainage accuracy.

[0035] Specifically, the water inlet channel 10 passes through the upper end of the valve body 2, and the drainage channel 11 passes through the lower end of the valve body 2. The cross-sectional shapes of the water inlet channel 10 and the drainage channel 11 are both circular. The water inlet channel 10 is used to connect with the battery stack. The water in the battery stack that needs to be discharged can enter the water inlet channel 10, then transition to the drainage channel 11, and finally be discharged through the drainage channel 11. The valve core 4 is arranged in the drainage channel 11, and the valve core 4 can move in the drainage channel 11 along its radial direction. When the valve core 4 is close to the sealing surface, the water inlet channel 10 can be separated from the drainage channel 11. When the valve core 4 is separated from the sealing surface, the water inlet channel 10 is connected with the drainage channel 11. The regulating spring 5 is in a compressed state, and an upward thrust is applied to the valve core 4 through the regulating spring 5. The thrust of the regulating spring 5 is greater than the gravity of the valve core 4. At this time, the valve core 4 is tightly attached to the sealing surface, separating the water inlet channel 10 from the drainage channel 11; when the water in the battery stack shell gradually enters the water inlet channel 10, the pressure received by the regulating spring 5 gradually increases. When the sum of the water accumulated in the water inlet channel 10 and the gravity of the valve core 4 is greater than the thrust of the regulating spring 5, the valve core 4 moves downward, the valve core 4 breaks away from the sealing surface, the water inlet channel 10 is connected with the drainage channel 11, and the water in the water inlet channel 10 transitions to the drainage channel 11; when the water in the water inlet channel 10 is gradually discharged, its gravity gradually decreases. When the sum of the water accumulated in the water inlet channel 10 and the gravity of the valve core 4 is less than the thrust of the regulating spring 5, the regulating spring 5 pushes the valve core 4 to move upward, so that the valve core 4 repeatedly blocks the water inlet channel 10.

[0036] It should be further explained that the adapter 9 is also a cylindrical structure, and the lower end of the adapter 9 has a connecting part with a larger inner diameter, which can be connected to the drainage pipe by quick plug or threaded connection, and the drainage channel 11 is guided to a designated location through the drainage pipe. However, when the drainage pipe needs to be replaced, when the drainage pipe is removed, the water inside the drainage channel 11 will directly leak out through the adapter 9. At this time, the above problem can be solved by the following solution: a positioning cylinder that can move along the axial direction of the adapter 9 is provided in the adapter 9, and a guide hole is provided on the upper outer wall of the positioning cylinder, the upper end of the positioning cylinder is a sealed structure, and the lower end of the positioning cylinder is an open structure. When the connecting part of the adapter 9 is not connected to the drainage pipe, the positioning cylinder moves downward under the action of the self-centering spring, and the guide hole of the positioning cylinder forms a sealing structure with the inner wall of the adapter 9. The drainage channel 11 is relatively sealed through the positioning cylinder, and the water in the drainage channel 11 will not be discharged through the positioning cylinder; when the connecting part is connected to the drainage pipe, the drainage pipe lifts the positioning cylinder upward, and at this time the guide hole of the positioning cylinder also moves upward, and the guide hole is separated from the inside of the adapter 9. The guide hole connects the drainage channel 11 with the positioning cylinder, so that the water in the drainage channel 11 can enter the drainage pipe through the positioning cylinder.

[0037] In some embodiments, the inner diameter of the water inlet channel 10 is smaller than the inner diameter of the drainage channel 11, the cross-sectional area of ​​the sealing surface gradually decreases in the direction close to the water inlet channel 10, and the outer shape of the valve core 4 is a cone that matches the sealing surface. By setting the sealing surface to be a conical surface, the sealing effect when the valve core 4 contacts the sealing surface is improved.

[0038] In some embodiments, a first sealing ring 3 is provided between the outer wall of the valve core 4 and the sealing surface. By providing the first sealing ring 3, the sealing effect between the valve core 4 and the sealing surface is increased.

[0039] Specifically, a positioning groove for placing the first sealing ring 3 is provided on the outer wall of the valve core 4, and the positioning groove is annular, and the positioning groove can play an auxiliary fixing role for the first sealing ring 3. The first sealing ring 3 is an O-ring, which has a large sealing pressure and high sealing reliability, and does not produce by-products during normal operation after installation.

[0040] In some embodiments, the portion of the adapter 9 located in the drainage channel 11 is provided with a first external thread, and the inner wall of the drainage channel 11 is provided with a first internal thread that matches the first external thread. The adapter 9 is sealed and connected to the valve body 2 by thread matching, and the distance between the adapter 9 and the water inlet channel 10 can be adjusted by screwing the adapter 9 in and out, so that the length of the adjustment spring 5 can be controlled in real time, thereby playing a role in controlling the thrust of the adjustment spring 5.

[0041] In some embodiments, a groove is provided at one end of the adapter 9 close to the valve core 4, and the portion of the adjusting spring 5 in contact with the adapter 9 is located in the groove. By providing the groove, the adjusting spring 5 can be matched, and the probability of the adjusting spring 5 being separated from the adapter 9 is reduced, thereby playing the function of preventing the adjusting spring 5 from falling off.

[0042] In some embodiments, the end of the adapter 9 away from the valve core 4 is located outside the drainage channel 11 and is used to connect with the drainage pipeline, so that the drainage pipeline is connected with the drainage channel 11 through the adapter 9, and the waste water is guided and discharged in time.

[0043] In some embodiments, the portion of the adapter 9 outside the drainage channel 11 is threadedly connected with a first nut 7, and the outer wall of the valve body 2 is threadedly connected with a second nut 6. The first nut 7 and the second nut 6 have opposite rotation directions, and a lock pin 8 is detachably provided between the first nut 7 and the second nut 6. The first nut 7 and the second nut 6 have opposite rotation directions, so as to prevent the adapter 9 of the automatic drainage valve after debugging from being loosened or over-tightened.

[0044] Specifically, a plurality of coaxially aligned mounting holes are provided in the circumferential direction of the first nut 7 and the second nut 6, and the locking pin 8 can pass through the two mounting holes. The first nut 7 and the second nut 6 are connected by the locking pin 8 to prevent relative displacement between the first nut 7 and the second nut 6.

[0045] In some embodiments, the outer wall of the water inlet channel 10 is provided with a second external thread, and the second external thread is used for threaded connection with the battery stack housing. By providing the second external thread in the water inlet channel 10, it is convenient to quickly install the automatic drain valve on the battery stack housing.

[0046] In some embodiments, the outer wall of the valve body 2 is further provided with a flange 12, and the outer wall of the valve body 2 is sleeved with a second sealing ring 1 located between the flange 12 and the second external thread. By providing the flange 12, it is convenient to apply a rotating external force to the automatic drain valve through the flange 12, so that the automatic drain valve can be disassembled and installed relative to the battery stack housing, and the second sealing ring 1 plays a sealing role on the connection.

[0047] Specifically, the flange 12 may be a hexagonal flange 12 , and the flange 12 is used to apply a wrench torque when the automatic drain valve is connected to the battery stack.

[0048] In some embodiments, the inner wall of the water inlet end of the water inlet channel 10 is provided with a drainage slope, and the cross-sectional area of ​​the drainage slope gradually increases in the direction away from the water inlet channel 10. By providing the drainage slope, it is convenient to guide the liquid inside the battery stack into the water inlet channel 10. Facilitate water flow and drain water from the battery stack

[0049] Automatic drain valve debugging: The adjusting spring 5 of the automatic drain valve is a high-standard elastic spring. The elastic force of the spring can be determined by determining the screw-in distance of the adapter 9, and the drainage capacity and boundary of the automatic drain valve can be determined at the same time; the automatic drain valve can be customized to meet different drainage requirements, and the debugged automatic drain valve can be locked by the first nut 7, the second nut 6 and the locking pin 8.

[0050] Automatic drainage process: When water accumulates in the battery stack shell, water flows through the battery stack connection end of the valve body 2 and enters the water inlet channel 10 of the automatic drainage valve. The gravity of the water opens the valve core 4 of the automatic drainage valve, and the water passes through the valve core 4, the adjustment spring, and the adapter 9, and then comes to the drainage pipeline connected to the outside world. Through this process, the water in the battery stack shell is drained.

[0051] Prevent foreign matter from entering: When the external pressure is high, such as in harsh environments such as the battery stack wading through water, the valve core 4 is tightly fitted to the sealing surface under the action of external pressure to achieve a sealing effect and prevent foreign matter from entering; when external organisms try to invade the battery stack casing through the automatic drain valve, the cooperation between the valve core 4, the adjusting spring 5 and the first sealing ring 3 can also prevent them from entering.

[0052] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0053] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. An automatic drain valve, characterized in that: include: The valve body (2) has an inlet channel (10) and a drain channel (11) which are interconnected, and a sealing surface is provided at the transition between the inlet channel (10) and the drain channel (11); a valve core (4) which is movably disposed in the drainage channel (11), and the valve core (4) can cooperate with the sealing surface to block the water inlet channel (10), An adapter (9) is partially arranged in the drainage channel (11); an adjusting spring (5) is arranged between the adapter (9) and the valve core (4); the adjusting spring (5) applies a thrust to the valve core (4) to approach the water inlet channel (10); when the sum of the gravity of the liquid in the water inlet channel (10) and the valve core (4) is greater than the thrust of the adjusting spring (5), the valve core (4) is separated from the sealing surface to connect the water inlet channel (10) and the drainage channel (11); the distance of the adapter (9) relative to the water inlet channel (10) is adjustable to adjust the thrust of the adjusting spring (5).

2. The automatic drain valve according to claim 1, characterized in that: The inner diameter of the water inlet channel (10) is smaller than the inner diameter of the drainage channel (11), the cross-sectional area of ​​the sealing surface gradually decreases in the direction approaching the water inlet channel (10), and the outer shape of the valve core (4) is a cone that matches the sealing surface.

3. The automatic drain valve according to claim 1, characterized in that: A first sealing ring (3) is provided between the outer wall of the valve core (4) and the sealing surface.

4. The automatic drain valve according to claim 1, characterized in that: The portion of the adapter (9) located in the drainage channel (11) is provided with a first external thread, and the inner wall of the drainage channel (11) is provided with a first internal thread that matches the first external thread.

5. The automatic drain valve according to claim 1, characterized in that: A groove is provided at one end of the adapter (9) close to the valve core (4), and the portion of the regulating spring (5) in contact with the adapter (9) is located in the groove.

6. The automatic drain valve according to claim 1, characterized in that: One end of the adapter (9) away from the valve core (4) is located outside the drainage channel (11) and is used for connecting to a drainage pipeline.

7. The automatic drain valve according to claim 1, characterized in that: The portion of the adapter (9) located outside the drainage channel (11) is threadedly connected to a first nut (7), and the outer wall of the valve body (2) is threadedly connected to a second nut (6), the first nut (7) and the second nut (6) have opposite rotation directions, and a lock pin (8) is detachably provided between the first nut (7) and the second nut (6).

8. The automatic drain valve according to claim 1, characterized in that: The outer wall of the water inlet channel (10) is provided with a second external thread, and the second external thread is used for threaded connection with the battery stack shell.

9. The automatic drain valve according to claim 8, characterized in that: The outer wall of the valve body (2) is also provided with a flange (12), and the outer wall of the valve body (2) is sleeved with a second sealing ring (1) located between the flange (12) and the second external thread.

10. The automatic drain valve according to claim 1, characterized in that: The inner wall of the water inlet end of the water inlet channel (10) is provided with a drainage slope, and the cross-sectional area of ​​the drainage slope gradually increases in a direction away from the water inlet channel (10).

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