Turnover valve

Abstract

The utility model relates to a rollover valve which comprises a valve body, a floater and a head valve, the floater is arranged in the valve body, a compression spring is arranged on the lower portion of the floater, a sealing piece is arranged on the top of the floater, a sealing portion corresponding to the floater is arranged in the valve body, the sealing portion is arranged above the floater, and a vent hole is formed in the sealing portion. The vent hole is opposite to a sealing piece on the top of the floater, the head valve is arranged on one side of the valve body and fixedly connected with a top cover of the valve body through a vent pipeline, and an oil inlet hole is formed in the bottom of the valve body. According to the rollover valve, the head valve is arranged on one side of the valve body, and the head valve is fixedly connected with the top cover of the valve body through the ventilation pipeline, so that the overall height of the rollover valve can be reduced, the installation height is higher when the rollover valve is installed in an oil tank, and the ventilation capacity of the rollover valve is improved; according to the rollover valve, the installation height and position of the head valve can be adjusted according to the structure of an oil tank, so that connection of an exhaust pipe is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of automotive valves, in particular to a roll - over valve. Background Art

[0002] The roll - over valve is a gas valve installed on an automotive fuel tank. In the normal state, the roll - over valve can exhaust or intake air to maintain the pressure balance between the fuel tank and the outside world. At the same time, when the fuel tank is tilted or overturned, it can seal the fuel tank to ensure that there is no fuel leakage.

[0003] In the prior art, generally, the valve body of the roll - over valve consists of two upper and lower chambers, which are separated in the middle and have an exhaust hole. A head valve is installed on the upper part, and components such as a float and a spring are installed on the lower part. The float in the lower chamber can move up and down in the chamber. When the oil submerges the float, affected by the buoyancy, the float floats up and blocks the ventilation hole, and the ventilation hole cannot ventilate. Until the oil level drops to a certain height and the float falls, at this time, the roll - over valve regains the ventilation ability. The patent with the publication number CN113958746A discloses a large - flow roll - over valve, whose structure is an up - and - down structure, and the head valve is arranged on the top of the valve cover. The disadvantage of this roll - over valve is that it has a relatively high height. When installed in a vehicle, affected by the space inside the vehicle, only the lower end of the roll - over valve can be installed into the fuel tank, resulting in a relatively low installation position of the roll - over valve in the fuel tank, which affects the ventilation ability of the roll - over valve. Therefore, it needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a roll - over valve with enhanced ventilation ability for the problem of poor ventilation ability of the roll - over valve in the prior art described in the background art.

[0005] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0006] A roll - over valve, which includes a valve body, a float, and a head valve. The float is arranged inside the valve body. A compression spring is arranged at the lower part of the float, a sealing piece is arranged at the top of the float, a sealing part corresponding to the float is arranged inside the valve body, the sealing part is arranged above the float, a ventilation hole is arranged in the sealing part, and the ventilation hole is arranged opposite to the sealing piece at the top of the float. The head valve is arranged on one side of the valve body, and the head valve is fixedly connected to the top cover of the valve body through a ventilation pipeline. An oil inlet hole is arranged at the bottom of the valve body.

[0007] In the above solution, the valve body includes a housing, a spacer sleeve, and a top cover. The housing is cylindrical, a bottom plate is arranged at the bottom of the housing, the oil inlet hole is arranged on the bottom surface of the housing, an air hole is arranged in the middle of the side wall of the housing, the spacer sleeve is arranged inside the housing, a spacer sleeve top plate is arranged at the top of the spacer sleeve, the sealing part is arranged in the middle of the lower surface of the spacer sleeve top plate, the float is arranged inside the spacer sleeve, and the top cover is fixedly connected to the spacer sleeve and the housing.

[0008] In the above solution, the sealing part is a sealing part protruding downward relative to the top plate of the spacer sleeve. An air vent hole is provided on the sealing part. The lower end opening of the air vent hole is on the bottom surface of the sealing part, and the upper end opening of the air vent hole communicates with the inner cavity of the top cover. Through this setting, it is more convenient for the sealing piece on the top of the float to be in sealing cooperation with the sealing part after the float rises, thereby closing the air vent hole and preventing oil leakage.

[0009] In the above solution, the float includes an outer cylinder, an inner cylinder and a top plate. The lower ends of the outer cylinder and the inner cylinder are provided with openings. The upper ends of the outer cylinder and the inner cylinder are respectively connected to the top plate. The sealing piece is arranged on the upper surface of the top plate, and air vent holes are provided on the side walls of the outer cylinder and the inner cylinder. Through this setting, when the liquid level in the fuel tank is low, the sealing piece on the top of the float is separated from the sealing part on the top plate of the spacer sleeve, so that external gas can enter the spacer sleeve through the head valve and the air vent hole on the sealing part, then descend through the gap between the float and the spacer sleeve, enter the outer shell through the through hole in the middle of the spacer sleeve, and then enter the fuel tank through the air hole on the outer shell. Similarly, the gas in the fuel tank can also flow to the outside of the head valve through the above path, making the air pressure in the fuel tank consistent with the external air pressure. When the liquid level of the oil in the fuel tank rises, the float rises under the buoyancy of the oil, so that the sealing piece on the top of the float gradually abuts against the sealing part, closing the air vent hole of the sealing part, preventing the oil from rising to the head valve through the air vent hole, and further preventing oil leakage. Through the improvement of the float structure, the inner cavity of the float can be larger, which is more convenient for the float to rise under the buoyancy force.

[0010] In the above solution, a sealing piece mounting seat is provided on the top plate. The sealing piece mounting seat is a protruding inclined surface, and the sealing piece is fixedly arranged on the inclined surface. The sealing part is inclined, and the inclination angle of the sealing part corresponds to the inclination angle of the inclined surface for mounting the sealing piece. Through this setting, it is more convenient for the assembly and fixation of the sealing piece. At the same time, the sealing piece is arranged on the inclined surface and is inclined, and a matching inclined surface is arranged on the sealing part, which can make the sealing cooperation between the sealing piece and the sealing part better and further prevent oil leakage.

[0011] In the above solution, a protruding sealing strip is provided at a position near the edge of the sealing piece, and a downward sealing rib is provided on the lower surface of the sealing part. By providing a sealing strip at a position near the edge of the sealing piece and a downward sealing rib on the sealing part, the sealing effect between the sealing piece and the sealing part can be further enhanced.

[0012] In the above solution, a lifting guiding part is provided on the outer wall of the float, and a guiding part matching the lifting guiding part is provided on the inner wall of the spacer sleeve. Through the lifting guiding cooperation between the float and the spacer sleeve, the float can move up and down along the set direction and can prevent the float from rotating and affecting the sealing effect between the sealing piece and the sealing part.

[0013] In the above solution, several convex ribs are provided on the inner wall of the inner cylinder of the float. The top end of the compression spring abuts against the lower end of the convex rib, and the elastic force of the compression spring is less than the gravity of the float. By providing the convex ribs, the transmission of the elastic force between the float and the compression spring can be better matched. Since the elastic force of the compression spring is less than the gravity of the float, when there is no buoyancy of the oil, the float can descend, causing the compression spring to be in a compressed state. When the oil enters the spacer sleeve, under the combined action of the buoyancy of the oil and the elastic force of the compression spring, the float can rise, enabling the sealing piece to be sealed with the sealing part.

[0014] In the above solution, a convex platform is provided upward in the middle of the bottom plate of the outer shell. The diameter of the convex platform is smaller than the diameter of the compression spring. An oil drain hole is provided in the middle of the convex platform. A cushion block corresponding to the spacer sleeve and the float is provided on the bottom plate of the outer shell. An oil through hole is provided on the lower end surface of the spacer sleeve. By providing the convex platform, radial limitation of the compression spring can be achieved. By providing the oil drain hole, the oil that enters the float can quickly flow back into the fuel tank. By providing a cushion block corresponding to the spacer sleeve and the float on the bottom plate of the outer shell, an oil passage can be formed between the outer shell and the spacer sleeve and between the spacer sleeve and the float. When the liquid level in the fuel tank rises, the oil can quickly enter the spacer sleeve, and the float can quickly rise to close the vent hole to prevent oil leakage.

[0015] In the above solution, the head valve is a gravity head valve or a spring head valve. With this setting, the head valve can be selected according to the design requirements. The head valve can be a gravity head valve, a spring head valve, or other types of head valves.

[0016] In the above solution, an exhaust pipe joint is provided on the head valve, and the exhaust pipe joint is provided on the side wall of the head valve. By providing the exhaust pipe joint, it is convenient to connect the exhaust pipe to the head valve. The exhaust pipe joint can be provided on any side of the side wall of the head valve according to the design requirements.

[0017] The utility model has positive effects: 1) For the tipping valve of the utility model, the head valve is arranged on one side of the valve body, and the head valve is fixedly connected to the top cover of the valve body through a ventilation pipe, which can reduce the overall height of the tipping valve, enabling a higher installation height when the tipping valve is installed in the fuel tank and improving the ventilation capacity of the tipping valve; 2) For the tipping valve of the utility model, the installation height and position of the head valve can be adjusted according to the structure of the fuel tank to facilitate the connection of the exhaust pipe. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the tipping valve of the utility model.

[0019] Figure 2 It is a sectional structural schematic diagram of the tipping valve of the utility model (the head valve adopts a gravity head valve).

[0020] Figure 3Schematic cross-sectional structure diagram of the tipping valve of the present utility model (the head valve adopts an elastic head valve).

[0021] Figure 4 Schematic structure diagram of the outer shell of the present utility model.

[0022] Figure 5 Schematic structure diagram of the spacer sleeve of the present utility model.

[0023] Figure 6 Schematic bottom view structure diagram of the spacer sleeve of the present utility model.

[0024] Figure 7 Schematic structure diagram of the top cover of the present utility model.

[0025] Figure 8 Schematic structure diagram of the float of the present utility model.

[0026] Figure 9 Schematic bottom view structure diagram of the float of the present utility model.

[0027] The reference numerals in the figure are: valve body 1, outer shell 11, bottom plate 111, oil inlet hole 112, air hole 113, cushion block 114, connecting part 115, convex platform 116, oil drain hole 117, spacer sleeve 12, spacer sleeve top plate 121, sealing part 122, ventilation hole 123, step surface 124, guiding part 125, sealing rib 126, sealing groove 127, positioning groove 128, through hole 129, top cover 13, connecting edge 131, positioning ring 132, snap block 133, cavity 134, ventilation port 135, float 2, outer cylinder 21, inner cylinder 22, top plate 23, ventilation hole 24, lifting guiding part 25, rib 26, sealing piece mounting seat 27, snap 28, snap seat 29, head valve 3, gravity head valve 31, spring head valve 32, exhaust pipe joint 4, ventilation pipe 5, compression spring 6, sealing piece 7, sealing strip 71. Specific embodiments

[0028] The technical solutions of the present utility model will be clearly and completely described below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] As Figures 1-3 shown, the tipping valve of the present utility model includes a valve body 1, a float 2 and a head valve 3.

[0030] The valve body 1 includes an outer shell 11, a spacer sleeve 12 and a top cover 13.

[0031] As Figure 4As shown, the outer shell 11 of the valve body 1 is cylindrical. A bottom plate 111 is provided at the bottom of the outer shell 11, and an oil inlet hole 112 is provided on the bottom plate 111. The position and number of the oil inlet holes 112 can be set as required. As shown in the attached drawings, multiple oil inlet holes 112 can be designed, and the oil inlet holes 112 are respectively provided at positions corresponding to the inner cylinder, outer cylinder, and spacer sleeve of the float 2. An air hole 113 is provided in the middle of the side wall of the outer shell 11, and a spacer 114 corresponding to the spacer sleeve 12 and the float 2 is provided on the bottom plate 111 of the outer shell 1.

[0032] As Figures 5-6 shown, the spacer sleeve 12 is cylindrical. The spacer sleeve 12 is arranged inside the outer shell 11. A spacer sleeve top plate 121 is provided at the top of the spacer sleeve 12, and a sealing portion 122 is provided in the middle of the lower surface of the spacer sleeve top plate 121. As a preferred embodiment, the sealing portion 122 can be set as a sealing portion protruding downward relative to the spacer sleeve top plate 121. An air vent hole 123 is provided on the sealing portion 122. The lower end opening of the air vent hole 123 is on the bottom surface of the sealing portion 122, and the upper end opening of the air vent hole 123 communicates with the internal cavity of the top cover 13.

[0033] To facilitate the passage of gas through the side wall of the spacer sleeve 12, a through hole 129 is provided on the side wall of the spacer sleeve 12.

[0034] To facilitate the passage of oil from the lower end of the spacer sleeve 12, an oil through hole is provided on the lower end surface of the spacer sleeve 12.

[0035] As Figure 7 shown, the top cover 13 is a disc-shaped top cover. The top cover 13 is fixedly connected to the spacer sleeve 12 and the outer shell 11 respectively.

[0036] To improve the sealing performance, a sealing connection portion is provided on the outer wall of the spacer sleeve 12, near the position of the spacer sleeve top plate 121. A sealing groove 127 is provided on the outer peripheral surface of the sealing connection portion, and a sealing ring is provided in the sealing groove 127. A positioning groove 128 is also provided on the upper surface of the sealing connection portion. A positioning ring 132 cooperating with the positioning groove 128 is provided on the top cover 13. Radial positioning is carried out through the cooperation of the positioning ring 132 and the positioning groove 128. On the top cover 13, a connecting edge 131 is further provided outside the positioning ring 132. The connecting edge 131 contacts the sealing ring, so that the spacer sleeve 12 and the top cover 13 are sealed and connected.

[0037] At the upper part of the outer shell 11, there is also a connecting part 115. The inner diameter of the connecting part 115 is adapted to the outer diameter of the connecting edge 131 of the top cover 13, and the connecting edge 131 of the top cover 13 is fixedly connected to the connecting part 115 of the outer shell 11. There are various connection methods between the connecting edge 131 of the top cover 13 and the connecting part 115 of the outer shell 11, such as screw connection, welding connection, bonding or snap - fit connection. In the embodiment shown in the drawings, there are snap - blocks 133 on the connecting edge 131 of the top cover 13, and snap - holes on the connecting part 115 of the outer shell 11. The top cover 13 and the outer shell 11 are connected by snap - fit.

[0038] There is a cavity 134 for air flow inside the top cover 13. There is a ventilation duct 5 on one side of the top cover 13, and there is a ventilation opening 135 between the ventilation duct 5 and the cavity 134.

[0039] There is a stepped surface 124 on the partition sleeve top plate 121. Among them, the height of the top of the stepped surface 124 corresponds to the top surface of the top cover 13, and the lower stepped surface is arranged on the side close to the ventilation duct 5.

[0040] As Figures 8-9 shown, the float 2 is arranged inside the partition sleeve 12. The float 2 includes an outer cylinder 21, an inner cylinder 22 and a top plate 23. The lower ends of the outer cylinder 21 and the inner cylinder 22 are provided with openings, and the upper ends of the outer cylinder 21 and the inner cylinder 22 are respectively connected to the top plate 23.

[0041] Both the outer cylinder 21 and the inner cylinder 22 are cylindrical, and ventilation holes 24 are provided on the side walls of the outer cylinder 21 and the inner cylinder 22. There is a lifting guiding part 25 on the outer wall of the outer cylinder 21, and a guiding part 125 matching the lifting guiding part is provided on the inner wall of the partition sleeve 12. The specific implementation method can be set according to needs. For example, a guiding groove can be set on the outer wall of the outer cylinder, and a guiding rib can be set on the inner wall of the partition sleeve. The rib is arranged in the guiding groove. Through the cooperation of the rib and the guiding groove, it is ensured that the float can only move up and down along the rib.

[0042] There are several convex ribs 26 on the inner wall of the inner cylinder 22. A compression spring 6 is arranged inside the inner cylinder. The elastic force of the compression spring 6 is less than the gravity of the float. The top end of the compression spring 6 abuts against the lower end of the convex rib 26, and the lower end of the compression spring 6 abuts against the bottom plate 111 of the outer shell 11. There is an upward convex platform 116 in the middle of the bottom plate 111 of the outer shell 11. The diameter of the convex platform 116 is smaller than the diameter of the compression spring 6, and there is an oil discharge hole 117 in the middle of the convex platform 116.

[0043] A sealing piece mounting seat 27 is provided on the top plate 23. The structure of the sealing piece mounting seat 27 can be set as required. Preferably, the scheme shown in the attached drawing is adopted. The sealing piece mounting seat 27 is a raised inclined surface, and the sealing piece 7 is fixedly arranged on the inclined surface. Correspondingly, the sealing part 122 is inclined, and the inclination angle of the sealing part 122 corresponds to the inclination angle of the inclined surface where the sealing piece 7 is mounted.

[0044] The fixing method of the sealing piece 7 can be selected as required. Preferably, snap fixation is adopted. As shown in the attached drawing, a snap seat 29 is provided on the side of the top plate 23, and the sealing piece 7 is fixedly connected to the snap seat 29 through a snap 28.

[0045] A raised sealing strip 71 is provided at a position near the edge of the sealing piece 7, and a downward sealing rib 126 is provided on the lower surface of the sealing part 122.

[0046] The head valve 3 can be selected according to the design requirements. For example, the head valve 3 can adopt a gravity head valve or a spring head valve or other types of head valves. An exhaust pipe joint is provided on the head valve, and the exhaust pipe joint is arranged on the side wall of the head valve. By providing the exhaust pipe joint, it is convenient to connect an exhaust pipe to the head valve, and the exhaust pipe joint can be arranged on any side of the side wall of the head valve according to the design requirements.

[0047] As Figure 2 shown, the head valve adopted is a gravity head valve. The working principle of the gravity head valve is that under the action of the gravity of the valve block in the valve body, the valve block is usually in a closed state with the air inlet, and only a small air flow gap is reserved between the valve block and the air inlet, and a small air flow can pass through the air flow gap; when the air pressure difference inside and outside the tipping valve increases and can overcome the gravity of the valve block, the valve block rises, separating the valve block from the air inlet, completely opening the air flow channel, and conducting the air flow channel between the air inlet and the exhaust pipe joint. At this time, a large amount of gas can pass through the gravity head valve.

[0048] As Figure 3 shown, the head valve adopted is a spring head valve. The working principle of the spring head valve is that under the action of the spring force, the valve core in the valve body is usually in a closed state with the air inlet, and only a very small air flow gap is reserved between the valve core and the air inlet, and a small air flow can pass through the air flow gap; when the air pressure difference inside and outside the tipping valve increases and can overcome the spring force, the valve core moves to the right, compressing the spring, separating the valve core from the air inlet, completely opening the air flow channel, and conducting the air flow channel between the air inlet and the exhaust pipe joint. At this time, a large air flow can pass through the spring head valve.

[0049] When the tipping valve of the present utility model is working, it is fixedly installed on the top plate of the vehicle fuel tank. The lower part of the outer shell of the tipping valve is installed inside the fuel tank, and the head valve and the top cover are arranged outside the vehicle fuel tank. When the liquid level in the fuel tank is relatively low, the sealing piece on the top of the float is separated from the sealing part on the top plate of the spacer sleeve, enabling external gas to enter the spacer sleeve through the vent hole on the head valve and the sealing part, then descend through the gap between the float and the spacer sleeve, enter the outer shell through the through hole in the middle of the spacer sleeve, and then enter the fuel tank through the air hole on the outer shell. Similarly, the gas in the fuel tank can also flow to the outside of the head valve through the above path, making the air pressure in the fuel tank consistent with the external air pressure. When the vehicle is driving and jolting, the liquid level of the oil in the fuel tank rises, and the oil liquid enters the outer shell through the oil inlet hole at the bottom of the outer shell, generating buoyancy on the float. Under the combined action of the buoyancy and the elastic force of the compression spring, the float rises, causing the sealing piece on the top of the float to gradually press against the sealing part on the top plate of the spacer sleeve, closing the vent hole of the sealing part and preventing the oil liquid from rising to the head valve through the vent hole, thereby preventing oil leakage. After the liquid level in the fuel tank drops, the oil that enters the valve body returns to the fuel tank through the oil inlet hole and the oil drain hole in the middle of the boss, causing the float to descend under the action of gravity, separating the sealing piece from the sealing part, reopening the air flow channel, and enabling the tipping valve to ventilate again.

[0050] For the tipping valve of the present utility model, the setting method of the head valve is changed. The head valve is arranged on one side of the valve body, reducing the height of the valve body. When installing the tipping valve, the part entering the vehicle fuel tank can be reduced, increasing the installation height of the tipping valve and enhancing the ventilation capacity of the tipping valve.

[0051] The tipping valve of the present utility model is designed such that the valve body includes a structure of an outer shell, a spacer sleeve, and a top cover. During installation, only the spacer sleeve needs to be inserted into the outer shell, and the top cover is fixedly connected to the spacer sleeve and the outer shell respectively. A sealing ring is provided at the installation part of the top cover and the spacer sleeve to improve the sealing performance of the connection. The connection between the top cover and the outer shell uses a snap connection, making disassembly and assembly very convenient.

[0052] For the tipping valve of the present utility model, a stepped surface is provided on the top plate of the spacer sleeve. The height of the top of the stepped surface corresponds to the top surface of the top cover. The lower stepped surface is arranged on the side close to the ventilation pipe. During installation, the top of the stepped surface can press against the top cover, and the lower stepped surface faces the ventilation pipe. Through this setting, an air flow guide can be formed, making the air flow more smooth.

[0053] For the tipping valve of the present utility model, the sealing piece on the top of the float is designed to be in an inclined state. Correspondingly, the sealing part is also inclined. Through this matching method, the sealing effect between the sealing piece and the sealing part can be better, preventing oil leakage when the vehicle jolts. By setting a sealing strip near the edge of the sealing piece and a sealing rib on the sealing part, the sealing effect between the sealing piece and the sealing part can be further enhanced through two seals. The sealing piece is fixed on the top plate of the float by a snap connection, making the disassembly and assembly of the sealing piece more convenient.

[0054] For the tipping valve of the present utility model, the float is designed with a structure of an inner cylinder, an outer cylinder and a top plate, which can make the inside of the float have more cavities, improve the floating sensitivity of the float, and enable the float to rise rapidly when the oil enters the tipping valve.

[0055] For the tipping valve of the present utility model, by designing a lifting guide part on the float and a guide part on the inner wall of the spacer sleeve, the lifting movement of the float can be guided and the float can be circumferentially limited, ensuring that when the float rises, the sealing piece at the top can be in sealing cooperation with the sealing part.

[0056] For the tipping valve of the present utility model, by designing a rib in the inner cylinder of the float, the rib can be in tight cooperation with the compression spring, enabling the transmission of elastic force between the compression spring and the float.

[0057] For the tipping valve of the present utility model, by designing a boss on the bottom plate of the outer shell, the radial positioning of the compression spring can be achieved. By designing an oil drain hole in the middle of the boss, when the liquid level in the fuel tank drops, the oil that enters the float can quickly return to the fuel tank through the oil drain hole, enabling the float to quickly reset.

[0058] For the tipping valve of the present utility model, the head valve can be flexibly selected according to needs. For example, a gravity head valve or a spring head valve shown in the attached drawings can be selected. Moreover, the exhaust pipe joint on the head valve can be arranged on any side of the side wall of the head valve according to design needs to facilitate the layout of the exhaust pipe, and the installation height of the head valve can be adjusted by setting the height of the exhaust pipe to facilitate the assembly of the head valve.

[0059] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A rollover valve, characterized in that: The utility model comprises a valve body, a float and a head valve. The float is arranged in the valve body. A compression spring is arranged at the lower part of the float. A sealing sheet is arranged at the top of the float. A sealing part corresponding to the float is arranged in the valve body. The sealing part is arranged above the float. A vent hole is arranged in the sealing part. The vent hole is arranged opposite to the sealing sheet at the top of the float. The head valve is arranged at one side of the valve body. The head valve is fixedly connected to the top cover of the valve body through a vent pipe. An oil inlet hole is arranged at the bottom of the valve body.

2. The rollover valve according to claim 1, characterized in that: The valve body includes an outer shell, a spacer sleeve and a top cover. The outer shell is cylindrical, and a bottom plate is provided at the bottom of the outer shell. The oil inlet hole is arranged on the bottom surface of the outer shell, and an air hole is provided in the middle of the side wall of the outer shell. The spacer sleeve is arranged in the outer shell, and a spacer sleeve top plate is provided on the top of the spacer sleeve. The sealing part is arranged in the middle of the lower surface of the spacer sleeve top plate, the float is arranged in the spacer sleeve, and the top cover is fixedly connected to the spacer sleeve and the outer shell.

3. The rollover valve according to claim 2, characterized in that: The sealing part is a sealing part that protrudes downward relative to the top plate of the spacer sleeve, and is provided with a vent hole. The lower end opening of the vent hole is on the bottom surface of the sealing part, and the upper end opening of the vent hole is connected to the internal cavity of the top cover.

4. The rollover valve according to claim 1, characterized in that: The float comprises an outer tube, an inner tube and a top plate, the lower ends of the outer tube and the inner tube are provided with openings, the upper ends of the outer tube and the inner tube are respectively connected to the top plate, the sealing sheet is arranged on the upper surface of the top plate, and the side walls of the outer tube and the inner tube are provided with vents; a sealing sheet mounting seat is arranged on the top plate, the sealing sheet mounting seat is a raised inclined surface, the sealing sheet is fixedly arranged on the inclined surface, the sealing part is inclined, and the inclination angle of the sealing part corresponds to the inclination angle of the inclined surface on which the sealing sheet is installed.

5. The rollover valve according to claim 1, characterized in that: A raised sealing strip is provided at a position close to the edge of the sealing sheet, and a downward sealing convex strip is provided on the lower surface of the sealing portion.

6. The rollover valve according to claim 1, characterized in that: A lifting guide part is arranged on the outer wall of the float, and a guide part matching the lifting guide part is arranged on the inner wall of the spacer.

7. The rollover valve according to claim 4, characterized in that: A plurality of convex ribs are arranged on the inner wall of the inner cylinder of the float, the top end of the compression spring is pressed against the lower end of the convex rib, and the elastic force of the compression spring is smaller than the gravity of the float.

8. The rollover valve according to claim 2, characterized in that: An upward boss is provided in the middle of the bottom plate of the shell, the diameter of the boss is smaller than the diameter of the compression spring, an oil drain hole is provided in the middle of the boss, a pad corresponding to the spacer and the float is provided on the bottom plate of the shell, and an oil through hole is provided on the lower end surface of the spacer.

9. The rollover valve according to claim 1, characterized in that: The head valve is a gravity head valve or a spring head valve.

10. The rollover valve according to claim 1, characterized in that: The head valve is provided with an exhaust pipe joint, which is arranged on the side wall of the head valve.

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