Expansion kettle pressure cover suitable for pure electric vehicle

Abstract

The utility model discloses an expansion kettle pressure cover suitable for a pure electric vehicle, which is characterized in that only one sealing ring is arranged on the outer side of a valve body, a kettle opening is sealed, the internal and external pressure of the kettle opening is isolated, the number of the sealing rings is reduced, the weight is reduced, and the cost is reduced; the exhaust hole is formed by extending the exhaust channel in the threaded valve cover to the two sides of the threaded valve cover, the exhaust hole only needs to be communicated with the exhaust hole channel, the requirements for the opening position, shape and size precision of the exhaust hole are lowered, the structure is simple, and the manufacturing and assembling cost of the pressure cover is lowered; the first valve element assembly is made of a nylon plastic part, so that the weight of the first valve element assembly is reduced, the pressure needing to be overcome for opening the pressure cover is reduced, the opening pressure of the pressure cover is effectively reduced, the pressure cover is matched with the small pressure of a cooling system of a pure electric vehicle, and therefore the pressure cover is suitable for the pure electric vehicle to guarantee the working stability of the cooling system of the pure electric vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to an expansion kettle pressure cover of a pure electric vehicle. Background Art

[0002] In the prior art, new energy pure electric vehicles and traditional fuel vehicles use the same expansion kettle pressure cap, such as Figure 1 As shown, the existing pressure cap 1' uses two sealing rings 2' to compress and seal the mouth 3' of the expansion kettle. The exhaust port 4' of the expansion kettle is set at the mouth 3' and placed between the two sealing rings 2'. At the same time, the large valve core 5' in the existing pressure cap 1' is made of high-strength steel to adapt to the higher pressure cap opening pressure of traditional fuel vehicles.

[0003] The working pressure of the cooling system of new energy pure electric vehicles is usually 35Kpa, and the working pressure of the cooling system of traditional fuel vehicles is usually 140Kpa. Therefore, the cooling system pressure of pure electric vehicles is much lower than that of traditional fuel vehicles, which makes the opening pressure of the expansion tank pressure cap in pure electric vehicles lower.

[0004] However, the opening pressure of the existing pressure cap is relatively high and is not suitable for pure electric vehicles. The pressure cap cannot work stably in pure electric vehicles, resulting in excessive pressure in the cooling system of the pure electric vehicle, causing coolant to overflow from the radiator, affecting the heat dissipation effect of the engine and even causing damage to the engine; at the same time, the exhaust port of the existing pressure cap is set at the pot mouth and placed between two sealing rings, resulting in high requirements on the opening position and dimensional accuracy of the exhaust port, resulting in high assembly cost of the pressure cap, and the large valve core is heavy, which increases the weight and cost of the pressure cap, resulting in a complicated opening structure of the pressure cap, which is not suitable for pure electric vehicles.

[0005] Therefore, how to effectively reduce the opening pressure of the pressure cover, ensure the working stability of the cooling system of pure electric vehicles, reduce the weight and cost of the pressure cover, and make the pressure cover simple in structure and suitable for pure electric vehicles has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the defects of the prior art, the purpose of the present invention is to provide an expansion kettle pressure cover which has a simple structure, low weight and cost, and is suitable for pure electric vehicles.

[0007] In order to achieve the above-mentioned purpose, the utility model provides an expansion kettle pressure cover for pure electric vehicles, which is used to cooperate with the mouth of the expansion kettle and includes a threaded valve cover, an exhaust hole and a valve body built into the threaded valve cover.

[0008] The valve body is adapted to the pot mouth, and a groove for accommodating a sealing ring is provided on the outer side of the valve body.

[0009] The valve body includes a first valve core assembly and a second valve core assembly. The first valve core in the first valve core assembly is composed of a lightweight valve core. The first valve core assembly and the second valve core assembly cooperate to form an exhaust channel and an intake channel inside the valve body.

[0010] The threaded valve cover is provided with a valve cover plate for connecting and cooperating with the valve body. The valve cover plate and the top plate of the threaded valve cover are arranged at a distance, and an exhaust hole channel is formed between the top plate and the valve cover plate. The exhaust channel extends along both sides of the threaded valve cover to form the exhaust holes on both sides of the threaded valve cover, and a first gas through hole connected to the exhaust channel and the air inlet channel is formed on the valve cover plate.

[0011] Furthermore, a first valve core accommodating chamber and a second valve core accommodating chamber are respectively formed at both ends inside the valve body. The second valve core accommodating chamber is convexly arranged at the bottom of the valve body and has a smaller cross-section than the first valve core accommodating chamber. An exhaust closure is formed at the end of the second valve core accommodating chamber that cooperates with the first valve core accommodating chamber, and a second gas through hole is also provided on the second valve core accommodating chamber.

[0012] Furthermore, the first valve core assembly is arranged in the first valve core accommodating cavity, and is composed of a first valve core and a first elastic member. The first valve core abuts against the exhaust closure member at the end of the second valve core accommodating cavity, and one end of the first elastic member is connected and cooperated with the valve cover plate, and the other end is connected and cooperated with the first valve core.

[0013] Furthermore, the first valve core is made of nylon plastic and has an air intake hole formed in the middle.

[0014] Furthermore, the second valve core assembly is arranged in the second valve core accommodating cavity, and is composed of a second valve core and a second elastic member. One end of the second elastic member is connected and cooperated with the bottom surface of the second valve core accommodating cavity, and the other end is connected and cooperated with the second valve core, so that the second valve core abuts against the first valve core.

[0015] Furthermore, an air intake closing component is formed at the end of the second valve core that cooperates with the first valve core, and a hole-blocking column that is adapted to the air intake through hole of the first valve core is formed in the middle.

[0016] Furthermore, a sealing gasket is provided between the first valve core and the second valve core.

[0017] Furthermore, the exhaust closure member and the intake closure member are formed with tapered ends.

[0018] Furthermore, the pot mouth is configured as a straight pot mouth with equal diameter.

[0019] Furthermore, the valve cover plate and the valve body are detachably connected and matched via snap fasteners.

[0020] The expansion water bottle pressure cover suitable for pure electric vehicles provided by the utility model is only provided with a sealing ring on the outside of the valve body to seal the pot mouth, isolate the pressure inside and outside the pot mouth, and reduce the number of sealing rings, thereby achieving weight reduction and cost reduction. At the same time, the exhaust hole is formed by the exhaust channel in the threaded valve cover extending to both sides of the threaded valve cover. The exhaust hole only needs to be connected to the exhaust hole channel, which reduces the requirements for the opening position, shape and dimensional accuracy of the exhaust hole. The structure is simple and the manufacturing and assembly cost of the pressure cover is reduced. Furthermore, the first valve core is composed of a lightweight valve core, such as a nylon plastic part, so that the weight of the first valve core component is reduced, so that the pressure to be overcome when opening the pressure cover is reduced, and the opening pressure of the pressure cover is effectively reduced, which is adapted to the smaller cooling system pressure of the pure electric vehicle, thereby being suitable for pure electric vehicles to ensure the working stability of the cooling system of the pure electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a structural diagram of the existing expansion kettle pressure cover;

[0023] Figure 2 This is a schematic diagram of the overall structure of the expansion kettle pressure cover for pure electric vehicles provided by the utility model;

[0024] Figure 3 This is a schematic diagram of the exploded structure of the expansion kettle pressure cover suitable for pure electric vehicles provided by the utility model;

[0025] Figure 4 This is a schematic diagram of the exhaust of the pressure cover in the utility model;

[0026] Figure 5 This is a schematic diagram of the air intake of the pressure cover in the present invention;

[0027] Reference numerals:

[0028] 1. Spout; 2. Threaded valve cover; 21. Top plate;

[0029] 3. Exhaust hole;

[0030] 4. Valve body; 41. Groove; 42. Exhaust channel; 43. Inlet channel; 44. First valve core accommodating chamber; 45. Second valve core accommodating chamber; 451. Exhaust closure member; 452. Second gas through hole;

[0031] 5. Sealing ring;

[0032] 6. First valve core assembly; 61. First valve core; 611. Air inlet hole; 62. First elastic member;

[0033] 7. Second valve core assembly; 71. Second valve core; 711. Air inlet closing member; 712. Hole blocking column; 72. Second elastic member;

[0034] 8. Valve cover plate; 81. Exhaust hole channel; 82. First gas through hole; 9. Sealing gasket. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0036] See also Figure 2 and Figure 3 , which shows an example of an expansion kettle pressure cover suitable for a pure electric vehicle provided by the utility model.

[0037] As can be seen from the figure, the expansion kettle pressure cap suitable for pure electric vehicles in this example is used to cooperate with the mouth 1 of the expansion kettle, and includes a threaded valve cover 2, an exhaust hole 3 and a valve body 4 built into the threaded valve cover 2.

[0038] Among them, the valve body 4 is adapted to the pot mouth 1, and a groove 41 is provided on the outside of the valve body 4 to accommodate the sealing ring 5 therein, so as to compress and seal the pot mouth 1 to prevent gas leakage in the valve body 4, while reducing the number of sealing rings and reducing the weight of the pressure cover; the valve body 4 includes a first valve core assembly 6 and a second valve core assembly 7, and the first valve core assembly 6 and the second valve core assembly 7 cooperate to form an exhaust channel 42 and an air intake channel 43 inside the valve body 4, so that the first valve core assembly 6 and the second valve core assembly 7 can cooperate to open the pressure cover for exhaust and air intake. At the same time, the first valve core 61 in the first valve core assembly 6 is composed of a lightweight valve core, so that the opening pressure of the pressure cover is relatively small, which is comparable to the smaller opening pressure required for the expansion kettle pressure cover of a pure electric vehicle. Adaptation, thereby ensuring the working stability of the cooling system of the pure electric vehicle; further, a valve cover plate 8 for connecting and cooperating with the valve body 4 is provided in the threaded valve cover 2, and the valve cover plate 8 and the top plate 21 of the threaded valve cover 2 are arranged at a distance, and an exhaust hole channel 81 is formed between the top plate 21 and the valve cover plate 8, so that the exhaust hole channel 81 extends along both sides to form exhaust holes 3 on both sides of the threaded valve cover 2, so that the opening position, shape and size accuracy of the exhaust hole 3 are relatively low, reducing the manufacturing and assembly cost of the pressure cover, and at the same time, a first gas through hole 82 connected with the exhaust channel 42 and the air intake channel 43 is formed on the valve cover plate 8, so that the first gas through hole 82 can cooperate with the exhaust channel 42 and the air intake channel 43 to transport the gas to the exhaust hole 3.

[0039] In order to enable the pressure cover to be connected and matched with the pot mouth 1, the valve cover plate 8 is arranged inside the threaded valve cover 2 and is spaced apart from the top plate 21 of the threaded valve cover 2. The valve body 4 is arranged on the valve cover plate 8 and is spaced apart from the inner wall of the threaded valve cover 2, so that when the valve body 4 is placed in the pot mouth 1, the threaded valve cover 2 is sleeved on the outer wall of the pot mouth 1, and the valve body 4 and the threaded valve cover 2 cooperate to fix and clamp the pot mouth 1, so that the gas in the expansion pot is discharged from the pot mouth 1 through the valve body 4 and the exhaust hole 3 on the threaded valve cover 2.

[0040] Here, the valve cover plate 8 and the valve body 4 are preferably detachably connected by snap fasteners, so that the valve body 4 can be removed from the valve cover plate 8 for maintenance and replacement, thereby reducing the manufacturing and assembly costs of the pressure cover.

[0041] Furthermore, the valve cover plate 8 and the top plate 21 are arranged at a distance from each other, so that an exhaust hole channel 81 is formed between the valve cover plate 8 and the top plate 21, and the exhaust hole channel 81 extends along both sides of the valve cover plate 8 and is connected with the exhaust holes 3 provided on both sides of the threaded valve cover 2, so that the exhaust holes 3 are provided on both sides of the threaded valve cover 2, and only need to be connected with the exhaust hole channel 81, and there is no restriction on the opening position, shape and size of the exhaust holes 3, thereby reducing the manufacturing and assembly cost of the pressure cover.

[0042] In coordination with this, a first gas through hole 82 is formed on the valve cover plate 8, and the first gas through hole 82 is connected to the valve body 4, so that the valve body 4 transmits the gas from the first gas through hole 82 to the exhaust hole channel 81, and discharges it from the exhaust hole 3 along the exhaust hole channel 81. Accordingly, the atmosphere outside the exhaust hole 3 can enter the valve body 4 through the exhaust hole channel 81 and the first gas through hole 82, so that the pressure difference between the gas and the atmospheric pressure generates pressure on the valve body 4, so that the valve body 4 moves under the action of pressure to open or close the pressure cover.

[0043] In order to make the valve body 4 fit closely with the pot mouth 1 and realize the transmission of gas in the expansion pot, the pot mouth 1 is preferably configured as a straight pot mouth of equal diameter, and the valve body 4 is adapted to the caliber of the pot mouth 1, so that when the valve body 4 is placed in the pot mouth 1, the valve body 4 abuts and fits against the inner wall of the pot mouth 1, and cooperates with the sealing ring 5 to seal the pot mouth 1, so that the sealing ring 5 divides the cooling system into two parts, and the end of the sealing ring 5 extending to the threaded valve cover 2 is the external atmospheric pressure, and the end of the sealing ring 5 extending to the inside of the pot mouth 1 is the cooling system pressure. Therefore, the valve body 4 can open or close the pressure cover under the pressure difference between the external atmospheric pressure and the cooling system pressure to transport the gas in the cooling system.

[0044] Furthermore, a first valve core accommodating cavity 44 and a second valve core accommodating cavity 45 are respectively formed at both ends inside the valve body 4, which are used to respectively accommodate the first valve core assembly 6 and the second valve core assembly 7 therein, so that the first valve core assembly 6 and the second valve core assembly 7 cooperate to open and close in the valve body 4 to form an exhaust channel 42 and an intake channel 43.

[0045] Specifically, the first valve core accommodating chamber 44 and the second valve core accommodating chamber 45 are connected to each other. The second valve core accommodating chamber 45 is protruded at the bottom of the valve body 4, and its cross-section is smaller than the first valve core accommodating chamber 44. The end of the second valve core accommodating chamber 45 that cooperates with the first valve core accommodating chamber 44 is formed with an exhaust closure member 451. The circumference of the second valve core accommodating chamber 45 is also distributed with a number of second gas through holes 452, so that the gas inside the pot mouth 1 can enter the valve body 4 through the second gas through holes 452, and generate pressure on the first valve core assembly 6 and the second valve core assembly 7 in the valve body 4, so that the first valve core assembly 6 and the second valve core assembly 7 cooperate to open or close the pressure cover under the pressure difference between the gas pressure and the external atmospheric pressure.

[0046] In coordination with it, the first valve core assembly 6 is placed in the first valve core accommodating chamber 44, and is composed of a first valve core 61 and a first elastic member 62. The first valve core 61 is configured with a convex cross-section and abuts against the exhaust closure member 451 at the end of the second valve core accommodating chamber 45. One end of the first elastic member 62 is connected and coordinated with the valve cover plate 8, and the other end is connected and coordinated with the first valve core 61. Thus, the second valve core accommodating chamber 45, the gap between the first valve core 61 and the second valve core accommodating chamber 45, and the first valve core accommodating chamber 44 cooperate to form the exhaust channel 42 in the valve body 4.

[0047] Preferably, a conical end is formed at the top of the exhaust closure member 451, so that the exhaust closure member 451 provides a smooth sealing surface for gas transmission. When the first valve core 61 and the conical end of the exhaust closure member 451 are tightly abutted under a certain pressure, the exhaust channel 42 can be closed. By changing the gap between the conical end and the first valve core 61, the opening degree of the exhaust channel 42 can be precisely adjusted, thereby precisely controlling the gas flow rate and the pressure of the system. At the same time, the smooth sealing surface provided by the conical end can also reduce turbulence and cavitation during gas flow, thereby ensuring the stable operation of the cooling system.

[0048] In the initial state, the exhaust channel 42 is closed, that is, the first valve core 61 abuts against the exhaust closure member 451, closing the second valve core accommodating chamber 45, so that the gap between the first valve core 61 and the second valve core accommodating chamber 45 is closed, so that the gas in the second valve core accommodating chamber 45 will not enter the first valve core accommodating chamber 44, nor can it be transmitted from the first gas through hole 82 on the valve cover plate 8 to the exhaust hole 3 for discharge.

[0049] When the pressure of the gas entering the second valve core accommodating chamber 45 is greater than the external atmospheric pressure, the gas generates pressure on the first valve core 61, causing the first valve core 61 to move toward the valve cover plate 8, and at the same time compressing the first elastic member 62, so that the first valve core 61 and the exhaust closure member 451 no longer abut against each other, opening the gap between the first valve core 61 and the second valve core accommodating chamber 45, thereby opening the exhaust passage 42, allowing the gas in the second valve core accommodating chamber 45 to enter the first valve core accommodating chamber 44, and enter the exhaust hole passage 81 along the first gas through hole 82 on the valve cover plate 8, and finally be discharged from the exhaust hole 3, as shown in FIG. Figure 4 shown.

[0050] When the gas is discharged and the gas pressure in the pot mouth 1 is released to maintain relative balance with the external atmosphere, the first elastic member 62 stretches under the action of its own elastic restoring force, driving the first valve core 61 to move toward the second valve core accommodating cavity 45, so that the first valve core 61 again abuts against the exhaust closing member 451, closing the exhaust channel 42.

[0051] This allows the gas in the expansion pot to be discharged.

[0052] Furthermore, the first valve core 61 is composed of a lightweight valve core, preferably a nylon plastic part, so that the first valve core 61 is light in weight, so that the gas can drive the first valve core 61 to move without applying a large pressure, thereby making the opening pressure of the pressure cover smaller, and can be suitable for the expansion pot of a pure electric vehicle with a smaller cooling system pressure.

[0053] Accordingly, in order to allow the external atmosphere to enter the expansion pot and stabilize the gas in the expansion pot, the second valve core assembly 7 is placed in the second valve core accommodating chamber 45, and is composed of a second valve core 71 and a second elastic member 72. One end of the second elastic member 72 is connected and cooperated with the bottom surface of the second valve core accommodating chamber 45, and the other end is connected and cooperated with the second valve core 71, so that the second valve core 71 is placed in the upper area of the second valve core accommodating chamber 45, abuts against the first valve core 61, and cooperates with each other to form the air intake channel 43 in the valve body 4.

[0054] Furthermore, an air intake hole 611 is formed in the middle of the first valve core 61, the second valve core 71 is configured as a convex cross-section, and an air intake closing component 711 is formed at the end of the second valve core 71 that cooperates with the first valve core 61, and a hole blocking column 712 is formed in the middle that is adapted to the air intake hole 611 of the first valve core 61, so that when the second valve core 71 abuts against the first valve core 61, the air intake closing component 711 abuts against the first valve core 61, and the hole blocking column 712 is placed in the air intake hole 611, thereby, the first valve core accommodating chamber 44, the air intake hole 611, the gap between the second valve core 71 and the first valve core 61 and the second valve core accommodating chamber 45 form the air intake channel 43 in the valve body 4.

[0055] Preferably, a conical end is formed at the top of the air intake closure member 711, so that the air intake closure member 711 provides a smooth sealing surface for the transmission of the external atmosphere. When the first valve core 61 and the conical end of the air intake closure member 711 seat are tightly abutted under a certain pressure, the air intake channel 43 can be closed. By changing the gap between the conical end and the first valve core 61, the opening degree of the air intake channel 43 can be precisely adjusted, thereby precisely controlling the gas flow rate and the pressure of the system. At the same time, the smooth sealing surface provided by the conical end can also reduce turbulence and cavitation during gas flow, thereby ensuring the stable operation of the cooling system.

[0056] In the initial state, the air inlet channel 43 is closed, that is, the air inlet closing member 711 of the first valve core 61 and the second valve core 71 are in contact, the blocking column 712 blocks the air inlet hole 611, and the gap between the first valve core 61 and the second valve core 71 is closed, and the first valve core accommodating cavity 44 is sealed, so that after the external atmosphere enters the first valve core accommodating cavity 44 through the exhaust hole 3 and the exhaust hole channel 81, it cannot enter the second valve core accommodating cavity 45 from the air inlet hole 611, and cannot enter the interior of the pot mouth 1 from the second gas through hole 452 on the second valve core accommodating cavity 45.

[0057] When the external atmospheric pressure entering the first valve core accommodating chamber 44 is greater than the gas pressure in the pot mouth, the external atmospheric pressure generates pressure on the blocking column 712 of the second valve core 71, causing the second valve core 71 to move toward the second valve core accommodating chamber 45 and compress the second elastic member 72 at the same time, causing the second valve core 71 to withdraw from the air inlet hole 611 of the first valve core 61, and the air inlet closing member 711 of the second valve core 71 no longer abuts against the first valve core 61, opening the gap between the first valve core 61 and the second valve core 71, thereby opening the air inlet channel 43, allowing the external atmosphere in the first valve core accommodating chamber 44 to enter the second valve core accommodating chamber 45, and enter the interior of the pot mouth 1 along the second gas through hole 452 on the second valve core accommodating chamber 45, as shown in FIG. Figure 5 shown.

[0058] When external atmospheric pressure enters and the gas pressure in the pot mouth 1 maintains a relative balance with the external atmospheric pressure, the second elastic member 72 stretches under the action of its own elastic restoring force, driving the second valve core 71 to move toward the valve cover plate 8, so that the air intake closing member 711 of the second valve core 71 again abuts against the first valve core 61, and the hole blocking column 712 blocks the air intake hole 611, closing the air intake channel 43.

[0059] This allows the outside atmosphere to enter the expansion pot.

[0060] Furthermore, a sealing gasket 9 is provided between the first valve core 61 and the second valve core 71 to ensure the sealing performance of the valve body 4 so that gas will not leak when passing through the valve body 4.

[0061] Therefore, the first valve core assembly 6 and the second valve core assembly 7 constituted by the above-mentioned scheme cooperate with the first valve core accommodating cavity 44 and the second valve core accommodating cavity 45 in the valve body 4. Under the pressure difference between the internal gas pressure of the pot mouth 1 and the external atmospheric pressure, the first valve core assembly 6 and the second valve core assembly 7 move relative to each other, opening or closing the exhaust channel 42 and the air intake channel 43, so as to realize the opening and closing of the expansion pot pressure cover, so that the working pressure of the cooling system remains stable.

[0062] The expansion water bottle pressure cap suitable for pure electric vehicles provided by the present invention is only provided with one sealing ring to isolate the internal and external pressures of the system while reducing weight and cost, and the exhaust holes 3 are provided on both sides of the threaded valve cover 2, which only need to be connected to the exhaust hole channel 81, and there is no restriction on the opening position, shape and size of the exhaust hole 3, thereby further reducing the manufacturing and assembly cost of the pressure cap. At the same time, the first valve core assembly 6 and the second valve core assembly 7 cooperate to move and open the pressure cap under the action of the pressure difference. The first valve body 61 composed of a lightweight valve body, such as a nylon plastic part, can reduce the weight and manufacturing cost of the pressure cap, so that the gas can drive the first valve core 61 to move without applying a large pressure, so that the opening pressure of the pressure cap is relatively small, which can be suitable for the expansion pot of pure electric vehicles with relatively small cooling system pressure, thereby ensuring the working stability of the cooling system of the pure electric vehicle.

[0063] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A pressure cap for an expansion kettle of a pure electric vehicle, used to cooperate with the mouth of the expansion kettle, comprising a threaded valve cover, an exhaust hole and a valve body built into the threaded valve cover, characterized in that: The valve body is adapted to the pot mouth, and a groove for accommodating a sealing ring is provided on the outside of the valve body. The valve body includes a first valve core assembly and a second valve core assembly. The first valve core in the first valve core assembly is composed of a lightweight valve core. The first valve core assembly and the second valve core assembly cooperate to form an exhaust channel and an air intake channel inside the valve body. The threaded valve cover is provided with a valve cover plate for connecting and cooperating with the valve body. The valve cover plate and the top plate of the threaded valve cover are arranged at a distance, and an exhaust hole channel is formed between the top plate and the valve cover plate. The exhaust hole channel extends along both sides of the threaded valve cover to form the exhaust holes on both sides of the threaded valve cover, and a first gas through hole connected to the exhaust channel and the air inlet channel is formed on the valve cover plate.

2. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 1, characterized in that: A first valve core accommodating chamber and a second valve core accommodating chamber are respectively formed at both ends inside the valve body. The second valve core accommodating chamber is convexly arranged at the bottom of the valve body and has a smaller cross-section than the first valve core accommodating chamber. An exhaust closure is formed at the end of the second valve core accommodating chamber that cooperates with the first valve core accommodating chamber, and a second gas through hole is also provided on the second valve core accommodating chamber.

3. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 2, characterized in that: The first valve core assembly is arranged in the first valve core accommodating cavity, and is composed of a first valve core and a first elastic member. The first valve core abuts against the exhaust closing member at the end of the second valve core accommodating cavity. One end of the first elastic member is connected and cooperated with the valve cover plate, and the other end is connected and cooperated with the first valve core.

4. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 3, characterized in that: The first valve core is made of a nylon plastic part and has an air intake hole formed in the middle.

5. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 4, characterized in that: The second valve core assembly is arranged in the second valve core accommodating cavity and is composed of a second valve core and a second elastic member. One end of the second elastic member is connected and cooperated with the bottom surface of the second valve core accommodating cavity, and the other end is connected and cooperated with the second valve core, so that the second valve core abuts against the first valve core.

6. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 5, characterized in that: An air intake closing component is formed at the end of the second valve core that cooperates with the first valve core, and a hole-blocking column adapted to the air intake through hole of the first valve core is formed in the middle.

7. The expansion tank pressure cap for pure electric vehicles according to claim 6, characterized in that: A sealing gasket is provided between the first valve core and the second valve core.

8. The expansion tank pressure cap for pure electric vehicles according to claim 7, characterized in that: The exhaust closure piece and the intake closure piece are formed with tapered ends.

9. The expansion kettle pressure cap suitable for pure electric vehicles according to claim 1, characterized in that: The pot mouth is configured as a straight pot mouth with equal diameter.

10. The expansion tank pressure cap for a pure electric vehicle according to claim 1, characterized in that: The valve cover plate and the valve body are detachably connected and matched via buckles.

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