Turnover valve for plug-in hybrid electric vehicle

Abstract

The invention discloses a rollover valve for a plug-in hybrid electric vehicle in the field of rollover valves, which comprises a bottom cover of a shell which is mutually clamped to form a cavity, a valve body which divides the cavity into an exhaust cavity, a pressure maintaining cavity and a gas-liquid cavity is connected in the shell in a clamping manner, and a first exhaust hole which is communicated with the pressure maintaining cavity and the gas-liquid cavity is formed in the valve body. A pressure maintaining piece capable of moving up and down is correspondingly arranged in the pressure maintaining cavity, an exhaust channel used for communicating the pressure maintaining cavity with the exhaust cavity is formed in the valve body, a floater capable of moving up and down is arranged in the valve body, a supporting framework capable of moving up and down in the axis direction of the floater is arranged at the top of the floater, and a sealing gasket is arranged on the supporting framework. The sealing gasket comprises a connecting part and a horn part which is arranged in a reduced mode from top to bottom, a second exhaust hole and a third exhaust hole are formed in the connecting part in the axis direction of the connecting part, and the diameter of the first exhaust hole is larger than that of the second exhaust hole and larger than that of the third exhaust hole. Small-flow exhaust is achieved in the normal working state, the first-stage opening pressure is increased, and the second-stage opening function is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of rollover valves, and in particular relates to a rollover valve used in a plug-in hybrid vehicle. Background Art

[0002] The fuel tank system of plug-in hybrid vehicles is designed to balance fuel efficiency and endurance, so its fuel tank capacity is usually small, generally around tens of liters, enough to support the operation of the fuel engine and provide additional mileage. In order to deal with the evaporative emissions problem that may be caused by long-term parking of plug-in hybrid vehicles, high-pressure fuel tanks have become a solution. High-pressure fuel tanks have higher strength and can withstand higher pressures, locking gasoline vapor in the tank until the next hybrid mode is used.

[0003] In the prior art, a rollover valve for hybrid vehicles is disclosed, with publication number: CN219452980U; application date: 2022-12-26; publication date: 2023-08-01; including an inner shell arranged in an outer shell, and the inner shell is sealed in the outer shell by an upper cover, one side of the upper cover is provided with an air outlet, the valve core is arranged in the inner shell so as to float up and down through a spring, the top valve cavity of the inner shell is provided with a head valve, the deformation seal is arranged obliquely on the top of the valve core, and one end of the deformation seal is movably connected with the top of the valve core; the contact part includes a first contact part and a second contact part, the first contact part and the second contact are arranged on the lower surface of the top valve cavity, and are respectively located at the two ends of the exhaust hole, and the bottom of the first contact part and the bottom of the second contact part are connected by an oblique line. By arranging an oblique and movable deformation seal on the top of the valve core, the deformation seal is sealed with the inclined surface of the contact part, and when the oil level drops, the valve core drives the deformation seal to be pulled down and then quickly exhausts the gas after the pressure relief hole generated between the contact part. The disadvantage is that it is difficult to accurately control the exhaust flow of fuel vapor in the fuel tank at different pressures through the rollover valve, which may easily lead to excessive fuel vapor entering the charcoal canister, thereby increasing the fuel vapor emission, and then evaporating from the charcoal canister vent to the outside, causing environmental pollution. Summary of the invention

[0004] The purpose of the present invention is to provide a rollover valve for a plug-in hybrid vehicle, which can achieve small flow exhaust under normal working conditions, not only improve the first-stage opening pressure, but also have a second-stage opening function.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a rollover valve for a plug-in hybrid vehicle, comprising a shell and a bottom cover, wherein the shell and the bottom cover are engaged with each other to form a cavity, a valve body is engaged with the shell to divide the cavity into an exhaust cavity, a pressure-maintaining cavity and a gas-liquid cavity, an exhaust hole 1 connecting the pressure-maintaining cavity and the gas-liquid cavity is provided on the valve body, a pressure-maintaining member that can move up and down along the axis direction of the exhaust hole 1 is provided in the corresponding pressure-maintaining cavity, an exhaust channel for connecting the pressure-maintaining cavity and the exhaust cavity is provided on the valve body, and a pressure-maintaining member that can move up and down along the axis direction of the exhaust hole 1 is provided in the corresponding pressure-maintaining cavity, a pressure-maintaining member that can move up and down along the axis direction of the exhaust hole 1 is provided in the valve body, A float moves up and down along the axis direction, a support frame which can move up and down along the axis direction is arranged on the top of the float, a sealing gasket is arranged on the support frame, the sealing gasket includes a connecting part and a trumpet part which is reduced from top to bottom, an exhaust hole 2 and an exhaust hole 3 are opened on the connecting part along the axis direction, the diameter of the exhaust hole 1 is larger than the diameter of the exhaust hole 2, the diameter of the exhaust hole 2 is larger than the diameter of the exhaust hole 3, a first sealing surface is formed when the float abuts against the exhaust hole 3, and a second sealing surface is formed when the trumpet part abuts against the exhaust hole 1.

[0006] When the present invention is used, the rollover valve is installed on the fuel tank and connected to the charcoal canister; under normal working conditions, the support frame and the float drive the sealing gasket away from the exhaust hole one under the action of their own gravity, and the gasoline vapor passes through the gas-liquid cavity, the exhaust hole one, the small flow exhaust channel, the pressure holding cavity and the exhaust cavity in turn, and finally enters the charcoal canister for adsorption; when the fuel in the fuel tank reaches the closing height or the vehicle tilts during driving, the support frame and the float move upward due to the buoyancy they receive to overcome their own gravity, until the sealing gasket is driven to block the exhaust hole one, and the top of the float blocks the exhaust hole two and the exhaust hole three, and the rollover valve is in a closed state; when the fuel vapor pressure in the gas-liquid cavity reaches the first-level pressure threshold, the pressure on the float is greater than the sum of its gravity and buoyancy, so that the float moves downward along its axial direction until it is away from the exhaust hole three. , the supporting frame is acted upon by the steam pressure so that the sealing gasket is tightly attached to the inner wall of the valve body, and the pressure-maintaining part floats up and down under the influence of the steam pressure, and the exhaust flow rate of the exhaust channel is continuously adjusted. The gasoline vapor passes through the gas-liquid chamber, exhaust hole three, exhaust hole two, exhaust hole one, pressure-maintaining chamber and exhaust chamber in turn, and finally enters the charcoal canister for adsorption. At this time, the rollover valve is in the first-level opening state; due to the first-level opening state, part of the fuel vapor is discharged, and the steam pressure in the gas-liquid chamber is reduced. Only when the fuel vapor pressure in the gas-liquid chamber reaches the second-level pressure threshold can the pressure on the float drive the supporting frame to move downward, until the sealing gasket is separated from the valve body and the exhaust hole one is opened, and the rollover valve reaches the second-level opening state, and the gasoline vapor passes through the gas-liquid chamber, exhaust hole one, pressure-maintaining chamber and exhaust chamber in turn, and finally enters the charcoal canister for adsorption.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: when the vehicle rolls over, the pressure-maintaining member abuts against the outer shell under the action of its own gravity, thereby preventing oil and gas from entering the pressure-maintaining chamber in the opposite direction; the supporting frame drives the sealing gasket to be close to the valve body under the action of its own gravity, so that the trumpet part abuts against the exhaust hole 1 and forms a second sealing surface; the float abuts against the exhaust hole 3 under the action of its own gravity and forms a first sealing surface, thereby preventing fuel leakage in the fuel tank, greatly reducing the threat posed by fuel leakage to the environment and personal safety in accidents; under normal working conditions, exhaust is carried out through a small-flow exhaust channel, so that the emission of fuel vapor is controlled to a certain extent, effectively reducing the air pollution of fuel vapor; the diameter of the exhaust hole 1 is greater than the diameter of the exhaust hole 2; The design of two diameters > three exhaust hole diameters ensures the stability of medium-flow exhaust in the first-stage opening state, and improves the first-stage opening pressure. It can match the PHEV high-pressure system, so that the fuel system can be exhausted at a higher pressure, and the second-stage opening can ensure large-flow exhaust, which can match the PHEV high-pressure fuel tank to achieve rapid exhaust; the sealing gasket adopts a trumpet-shaped structure with good structural tension, and further improves the tightness of the second sealing surface under the influence of fuel vapor pressure; compared with the prior art using a working structure coordinated with a bevel and a deformation seal, the sealing gasket cooperates with the valve body and the float to form two independent sealing surfaces, which reduces the design difficulty and production cost of the valve body.

[0008] As a further improvement of the technical solution of the present invention, the valve body includes a valve body, a valve ring for forming a pressure-maintaining cavity is arranged on the top of the valve body, a gap connecting the pressure-maintaining cavity and the exhaust cavity is left between the upper side of the valve ring and the inner wall of the shell, a boss is arranged on the periphery of the valve body corresponding to the exhaust hole, at least one exhaust port is arranged on the boss, a plurality of flow-limiting grooves are arranged on the inner wall of the valve ring along its axial direction, a flow-limiting step is arranged on the top of the valve body corresponding to the flow-limiting groove, and the height of the flow-limiting step is not higher than the height of the boss. A small-flow exhaust channel is formed by the boss, the exhaust port, the flow-limiting groove and the flow-limiting step, which ensures the reliability of the rollover valve during operation and improves the safety of the PHEV high-pressure system during operation.

[0009] As a further improvement of the technical solution of the present invention, the inner diameter of the exhaust hole three is ф1.0-2.0mm.

[0010] As a further improvement of the technical solution of the present invention, a sealing groove is provided on the outer periphery of the valve body, and a sealing ring is provided in the sealing groove to separate the cavity. While simplifying the assembly difficulty of the valve body and the outer shell, the exhaust cavity and the gas-liquid cavity can be effectively isolated to ensure their respective operating environment and stability. As a further improvement of the technical solution of the present invention, the bottom of the valve body is connected with a support, the support is provided with a spring, and the upper end of the spring is connected to the float. The spring provides an upward thrust to facilitate the high-pressure oil tank to release pressure and exhaust gas to the carbon canister.

[0011] As a further improvement of the technical solution of the present invention, the float comprises an inner cylinder and an outer cylinder arranged coaxially, a truncated cone and two mutually symmetrically distributed connecting hooks are arranged on the top of the outer cylinder, the truncated cone is used to block the exhaust hole three and form a first sealing surface, the support frame is provided with a mounting ear corresponding to the connecting hook, and the mounting ear is slidably connected to the connecting hook. The displacement stroke required for the second-level opening of the rollover valve is adjusted by changing the length of the connecting hook, thereby changing the threshold of the second-level pressure, which has high practicality; the outwardly protruding truncated cone cooperates with the sealing gasket to ensure the accuracy of the first-level opening of the rollover valve.

[0012] As a further improvement of the technical solution of the present invention, the inner wall of the shell is provided with a limiter for keeping the pressure-maintaining part in a normally open state, and the limiter includes a limiter ring and a plurality of diverter strips distributed along the circumference of the limiter ring. The diverter strips effectively divert the fuel vapor discharged from the pressure-maintaining chamber to the exhaust chamber, reduce the working load of the carbon canister, and ensure the continuity and effectiveness of its adsorption function; the limiter ring can avoid blocking the connecting gap between the pressure-maintaining chamber and the exhaust chamber when the pressure-maintaining part moves upward, and can also prevent the oil and gas from entering the pressure-maintaining chamber from the exhaust chamber in the reverse direction when the vehicle rolls over, or the oil contaminating the pressure-maintaining part.

[0013] As a further improvement of the technical solution of the present invention, a welding flange is snap-fitted on the top of the housing, the welding flange includes a flange seat, a plurality of plug-in ears are arranged on the lower side of the flange seat, and a connection column is arranged on the upper side, and the housing includes a plurality of mounting rings for connecting with the plug-in ears. The installation method of plugging in the connection column improves the convenience and flexibility of assembling the rollover valve and the plastic oil tank.

[0014] As a further improvement of the technical solution of the present invention, the shell includes a cylindrical shell, the outer periphery of the shell is provided with an exhaust pipe connected to the exhaust cavity, a plurality of through holes connected to the gas-liquid cavity, a plurality of mounting ports for engaging with the valve body, a plurality of wedge-shaped blocks are provided at the bottom, the bottom cover is provided with a plug-in slot corresponding to the plug-in block, a plurality of liquid inlets are provided at the bottom, the valve body is provided with a plug-in block corresponding to the mounting port, a plurality of slots for engaging with the support are provided at the outer periphery, the support is provided with a liquid inlet channel, and buckles are provided corresponding to the slots. The shell and the valve body, the valve body and the support, and the bottom cover and the shell are all connected by plug-in, so that the overall installation and fixation of the tipping valve is more convenient and reliable.

[0015] As a further improvement of the technical solution of the present invention, the outer side of the float is provided with a mutually symmetrically distributed guide strip 1 and a positioning groove 1 along its moving direction, the inner wall of the valve body is provided with a positioning groove 2 and a guide strip 2, the guide strip 1 is slidably connected with the positioning groove 2, and the guide strip 2 is slidably connected with the positioning groove 1. The cooperation between the guide strip and the positioning groove can ensure that the floating and sealing gasket are always on the same axis as the valve body during movement, thereby ensuring the stability of the float and the sealing gasket during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention.

[0017] Figure 2 This is the working state of the first embodiment of the present invention. Figure 1 .

[0018] Figure 3 It is a three-dimensional exploded view of the second embodiment of the present invention.

[0019] Figure 4 It is a top view of the second embodiment of the present invention.

[0020] Figure 5 for Figure 3 Cross-sectional view at AA in the middle.

[0021] Figure 6 for Figure 3 Cross-sectional view at the middle BB.

[0022] Figure 7 It is a bottom view of the housing of the second embodiment of the present invention.

[0023] Figure 8 This is the working state of the second embodiment of the present invention. Figure 1 .

[0024] Fig. 9 This is the working state of the second embodiment of the present invention. Figure 2 .

[0025] Fig.10 This is the working state of the second embodiment of the present invention. Figure 3 .

[0026] Among them, 1 shell, 101 shell, 102 exhaust pipe, 103 through hole, 104 installation port, 105 wedge-shaped block, 106 limit ring, 107 diverter strip, 108 installation ring, 2 bottom cover, 201 plug-in slot, 202 liquid inlet, 3 exhaust cavity, 4 pressure holding cavity, 5 gas-liquid cavity, 6 valve body, 601 exhaust hole 1, 602 sealing groove, 603 plug-in block, 604 slot, 605 valve body, 606 valve ring, 607 boss, 608 exhaust port, 609 flow limiting groove, 610 flow limiting step, 612 positioning groove 2, 613 guide strip 2, 7 Pressure maintaining part, 8 float, 801 guide strip one, 802 positioning groove one, 803 inner cylinder, 804 outer cylinder, 805 frustum, 806 connecting hook, 9 supporting frame, 10 sealing gasket, 1001 connecting part, 1002 horn part, 1003 exhaust hole two, 1004 exhaust hole three, 11 support, 1101 liquid inlet channel, 1102 buckle, 12 spring, 13 sealing ring, 14 gap, 15 mounting ear, 16 welding flange, 1601 flange seat, 1602 plug-in ear, 1603 connecting column, 17 first sealing surface, 18 second sealing surface. DETAILED DESCRIPTION Example

[0027] like Figure 1 As shown, a rollover valve for a plug-in hybrid vehicle comprises a shell 1 and a bottom cover 2. The shell 1 and the bottom cover 2 are engaged with each other to form a cavity. A valve body 6 is engaged with the shell 1 to divide the cavity into an exhaust cavity 3, a pressure-maintaining cavity 4 and a gas-liquid cavity 5. An exhaust hole 601 connecting the pressure-maintaining cavity 4 and the gas-liquid cavity 5 is provided on the valve body 6; a pressure-maintaining member 7 that can move up and down along the axis of the exhaust hole 601 is provided in the corresponding pressure-maintaining cavity 4; a small-flow exhaust channel for connecting the pressure-maintaining cavity 4 and the exhaust cavity 3 is provided on the valve body 6; a float 8 that can move up and down along the axis of the valve body 6 is provided in the corresponding gas-liquid cavity 5 of the valve body 6, and a support frame 9 that can move up and down along the axis of the valve body 6 is provided on the top of the float 8. A sealing gasket 10 is arranged on the support frame 9, and the sealing gasket 10 includes a connecting portion 1001 and a trumpet portion 1002 which is reduced from top to bottom. The connecting portion 1001 is provided with an exhaust hole 1003 and an exhaust hole 1004 along its axial direction; the diameter of the exhaust hole 1 601 is larger than the diameter of the exhaust hole 2 1003, and the diameter of the exhaust hole 2 1003 is larger than the diameter of the exhaust hole 3 1004; when the float 8 abuts against the exhaust hole 3 1004, a first sealing surface 17 is formed, and when the trumpet portion 1002 abuts against the exhaust hole 1 601, a second sealing surface 18 is formed; a support 11 is snap-connected at the bottom of the valve body 6, and a spring 12 is arranged on the support 11, and the upper end of the spring 12 is connected to the float 8.

[0028] Specifically, the shell 1 includes a cylindrical shell 101, and the outer periphery of the shell 101 is provided with an exhaust pipe 102 connected to the exhaust chamber 3, two through holes 103 connected to the gas-liquid chamber 5, two installation ports 104 for being snap-connected with the valve body 6, and four wedge-shaped blocks 105 are provided at the bottom; the bottom cover 2 is provided with a plug-in groove 201 corresponding to the plug-in block 603, and four liquid inlets 202 are provided at the bottom; a sealing groove 602 is provided on the outer periphery of the valve body 6, and a sealing ring 13 for separating the cavity is provided in the sealing groove 602; a sloped plug-in block 603 is provided on the valve body 6 corresponding to the installation port 104, and four snap-in grooves 604 for being snap-connected with the support 11 are provided on the outer periphery; a liquid inlet channel 1101 is provided on the support 11, and a buckle 1102 is provided corresponding to the snap-in groove 604. The main parts of the rollover valve are all connected by plug-in. The plug-in block 603 with an inclined surface structure can be quickly assembled by aligning the inclined surface with the installation port 104. The valve body 6 is simultaneously divided into an exhaust chamber 3, a pressure-maintaining chamber 4 and a gas-liquid chamber 5 that work independently of each other during assembly, which greatly simplifies the design structure and reduces the production cost. In actual use, this embodiment can be used in combination with a metal oil tank.

[0029] Figure 2 This is a schematic diagram of the normal working state of this embodiment. Under the action of their own gravity, the support frame 9 and the float 8 overcome the elastic force of the spring 12 and drive the sealing gasket 10 away from the exhaust hole 601. The gasoline vapor passes through the gas-liquid chamber 5, the exhaust hole 601, the small flow exhaust channel, the pressure holding chamber 4 and the exhaust chamber 3 in sequence, and finally enters the carbon canister for adsorption; the pressure holding part 7 is in a normally open state to achieve small flow exhaust. Example

[0030] like Figure 3-7 As shown, the difference between this embodiment and the first embodiment is that: the aperture of the third exhaust hole 1004 is preferably: ф1.5mm; the pressure-maintaining member 7 is a disc structure with a certain thickness; the valve body 6 includes a valve body 605, and a valve ring 606 for forming a pressure-maintaining chamber 4 is arranged on the top of the valve body 605, and a gap 14 connecting the pressure-maintaining chamber 4 and the exhaust chamber 3 is left between the upper side of the valve ring 606 and the inner wall of the shell 1, and the valve body 605 is provided with a boss 607 on the outer periphery of the exhaust hole 1 601, and two exhaust ports 608 are provided on the boss 607. The inner wall of the valve ring 606 is provided with a plurality of flow limiting grooves 609 along its axial direction, and a flow limiting step 610 is provided on the top of the valve body 605 corresponding to the flow limiting groove 609. The exhaust port 608, the flow limiting step 610, the flow limiting groove 609 and the gap 14 form a small-flow exhaust channel, which, together with the pressure-maintaining member 7 that can move up and down, can achieve high-precision control of the airflow rate of the exhaust channel; the height of the flow limiting step 610 is not higher than the height of the boss 607. When the pressure-maintaining member 7 contacts the boss 607, the airflow rate of the exhaust channel is minimum.

[0031] In order to ensure the stability of the float 8 when it moves up and down and avoid radial deflection during the movement, a guide strip 801 and a positioning groove 802 that are symmetrically distributed are provided on the outer side of the float 8 along its moving direction, and a positioning groove 612 and a guide strip 613 are provided on the inner wall of the valve body 6. The guide strip 801 is slidably connected to the positioning groove 612, and the guide strip 613 is slidably connected to the positioning groove 802, so as to provide a guide for the up and down movement of the float 8.

[0032] The float 8 includes an inner cylinder 803 and an outer cylinder 804 which are coaxially arranged. A truncated cone 805 and two symmetrically distributed connecting hooks 806 are arranged on the top of the outer cylinder 804. The truncated cone 805 is used to block the exhaust hole 3 1004 and form a first sealing surface 17. The support frame 9 is provided with a mounting ear 15 corresponding to the connecting hook 806. The mounting ear 15 is slidably connected to the connecting hook 806. The upper end of the spring 12 is arranged in the inner cylinder 803. The sliding connection structure of the support frame 9 and the float 8 is adopted to realize the secondary opening function, realize the complex control function with a simple process cost, meet the diversified needs, and have a broad application prospect.

[0033] The inner wall of the shell 1 is provided with a limit piece for keeping the pressure-maintaining piece 7 in a normally open state, and the limit piece includes a limit ring 106 and a plurality of diverter strips 107 distributed circumferentially along the limit ring 106; the top of the shell 1 is snap-connected with a welding flange 16, and the welding flange 16 includes a flange seat 1601, and the lower side of the flange seat 1601 is provided with four plug-in ears 1602, and the upper side is covered with connecting columns 1603; the shell 1 includes four mounting rings 108 for snap-connecting with the plug-in ears 1602, and the rollover valve with the welding flange 16 can be easily matched with the plastic oil tank.

[0034] like Figure 8 The working state shown is one, the closed state: When the fuel in the fuel tank reaches the closing height or the vehicle tilts during driving, the support frame 9 and the float 8 move upward due to the buoyancy that overcomes their own gravity, until the sealing gasket 10 blocks the exhaust hole 601, the cone 805 blocks the exhaust hole 1003 and the exhaust hole 1004, the pressure maintaining chamber 4 and the gas-liquid chamber 5 are completely isolated, the refueling gun stops refueling and prevents fuel from overflowing from the exhaust hole 601.

[0035] like Fig. 9 The working state shown is the second one, the first level opening state: When the fuel vapor pressure in the gas-liquid chamber 5 reaches the first-level pressure threshold, the pressure on the float 8 is greater than the sum of its gravity and buoyancy, so that the float 8 moves down along its axis until the truncated cone 805 is away from the exhaust hole 3 1004. Under the action of the steam pressure, the support frame 9 makes the sealing gasket 10 close to the inner wall of the valve body 6. The pressure-maintaining part 7 floats up and down in the pressure-maintaining chamber 4 under the influence of the steam pressure, and the exhaust flow of the exhaust channel is constantly fine-tuned. The gasoline vapor passes through the gas-liquid chamber 5, the exhaust hole 3 1004, the exhaust hole 2 1003, the exhaust hole 1 601, the exhaust channel and the exhaust chamber 3 in turn, and finally enters the carbon canister for adsorption. The diameter of the exhaust hole 3 1004 is much smaller than that of the exhaust hole 1 601, which can increase the first-level opening pressure to meet the high-pressure requirements of the fuel tank.

[0036] like Fig.10 The working state shown is the second level open state: In the first-level opening state, part of the fuel vapor is discharged, and the steam pressure value in the gas-liquid chamber 5 is slightly reduced. It is necessary to wait until the fuel vapor pressure in the gas-liquid chamber 5 reaches the second-level pressure threshold before the pressure on the float 8 can overcome the buoyancy and move downward until the float 8 moves beyond the length of the connecting hook 806, thereby driving the support frame 9 to move downward through the mounting ear 15 until the sealing gasket 10 is separated from the valve body 6 and the exhaust hole 601 is opened. The pressure on the pressure-maintaining part 7 overcomes its gravity and drives it to move upward away from the exhaust port 608, thereby increasing the exhaust flow rate of the exhaust channel. The rollover valve reaches the second-level opening state, and the gasoline vapor passes through the gas-liquid chamber 5, the exhaust hole 601, the exhaust channel and the exhaust chamber 3 in turn, and is exhausted to the charcoal canister at a fast and large flow rate for adsorption.

[0037] The advantages of the present invention are: through the relatively slidable float 8 and support frame 9 structure, combined with the flow-adjustable exhaust channel structure, a multi-stage opening function of the rollover valve is realized, and the exhaust flow is controlled in three flow rates of small, medium and large, thereby improving the control accuracy and reliability of the rollover valve and having high economic value.

[0038] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A rollover valve for a plug-in hybrid vehicle, comprising a housing and a bottom cover, wherein the housing and the bottom cover are engaged with each other to form a cavity, characterized in that: The closure of the valve body is of the type described in claim 1, wherein the closure of the valve body is an axially adjacent portion of the closure member, the closure member comprising a plurality of axially adjacent portions of the closure member, and the plurality of axially adjacent portions of the closure member.

2. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The valve body includes a valve body, a valve ring for forming a pressure-maintaining chamber is arranged on the top of the valve body, a gap connecting the pressure-maintaining chamber and the exhaust chamber is left between the upper side of the valve ring and the inner wall of the shell, a boss is arranged on the outer periphery of the valve body corresponding to the exhaust hole, at least one exhaust port is arranged on the boss, a plurality of flow-limiting grooves are arranged on the inner wall of the valve ring along its axial direction, a flow-limiting step is arranged on the top of the valve body corresponding to the flow-limiting groove, and the height of the flow-limiting step is not higher than the height of the boss.

3. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The inner diameter of the exhaust hole three is ф1.0-2.0mm.

4. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: A sealing groove is provided on the outer periphery of the valve body, and a sealing ring is arranged in the sealing groove to separate the cavity.

5. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The bottom of the valve body is clamped and connected with a support, the support is provided with a spring, and the upper end of the spring is connected with a float.

6. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The float comprises an inner cylinder and an outer cylinder arranged coaxially, a truncated cone and two symmetrically distributed connecting hooks are arranged on the top of the outer cylinder, the truncated cone is used to block the exhaust hole three and form a first sealing surface, and the support frame is provided with mounting ears corresponding to the connecting hooks, and the mounting ears are slidably connected to the connecting hooks.

7. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The inner wall of the shell is provided with a limiting member for keeping the pressure-maintaining member in a normally open state, and the limiting member comprises a limiting ring and a plurality of diverter strips distributed along the circumference of the limiting ring.

8. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The top of the shell is snap-fitted with a welding flange, which includes a flange seat. The lower side of the flange seat is provided with a plurality of plug-in ears, and the upper side is covered with connecting columns. The shell includes a plurality of mounting rings for connecting with the plug-in ears.

9. The rollover valve for a plug-in hybrid vehicle according to claim 5, characterized in that: The outer shell includes a cylindrical shell, the outer periphery of the shell is provided with an exhaust pipe connected to the exhaust chamber, a plurality of through holes connected to the gas-liquid chamber, a plurality of mounting ports for snap-fitting and connecting with the valve body, and a plurality of wedge-shaped blocks are provided at the bottom. The bottom cover is provided with a plug-in groove corresponding to the plug-in block, and a plurality of liquid inlets are provided at the bottom. The valve body is provided with a plug-in block corresponding to the mounting port, and a plurality of slots for snap-fitting and connecting with the support are provided at the outer periphery. The support is provided with a liquid inlet channel, and buckles are provided corresponding to the slots.

10. The rollover valve for a plug-in hybrid vehicle according to claim 1, characterized in that: The outer side of the float is provided with a guide strip 1 and a positioning groove 1 which are symmetrically distributed along its moving direction, the inner wall of the valve body is provided with a positioning groove 2 and a guide strip 2, the guide strip 1 is slidably connected to the positioning groove 2, and the guide strip 2 is slidably connected to the positioning groove 1.

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