Special multifunctional valve for high-pressure oil tank of hybrid vehicle

Abstract

The invention provides a special multifunctional valve for a high-pressure oil tank of a hybrid vehicle, which comprises an upper cover fixedly connected with the high-pressure oil tank, and a lower shell positioned in the high-pressure oil tank and provided with a first accommodating cavity and a second accommodating cavity; the connecting piece is connected between the upper cover and the lower shell; the refueling control valve assembly is arranged in the first containing cavity of the lower shell and can float up and down in the first containing cavity, and the refueling amount is controlled. The gradient exhaust assembly is arranged in the second containing cavity of the lower shell and can float up and down in the second containing cavity to achieve exhaust. And the oil supplementing and filling control valve assembly is arranged on the connecting piece above the gradient exhaust assembly and used for controlling the oil filling amount during oil supplementing and filling. The valve integrates various control functions such as oil filling, oil supplementing, gradient exhaust and liquid collecting, the floater adopts the noise reduction design, noise is reduced, the oil filling control valve and the gradient exhaust adopt the second-order opening design, and large-range pressure relief control can be achieved within a short time.

Description

Technical Field

[0001] The invention relates to the technical field of a high-pressure oil tank for a hybrid vehicle, and in particular to a special multifunctional valve for a high-pressure oil tank for a hybrid vehicle. Background Art

[0002] Hybrid electric vehicles (including plug-in, non-plug-in, and extended-range) are developing rapidly and have become the mainstream new energy vehicle model on the market. Compared with the low-pressure fuel tanks used in ordinary fuel vehicles, the high-pressure fuel tanks used in hybrid electric vehicles have higher requirements in terms of pressure resistance, exhaust pressure, exhaust flow, pressure relief time, and low noise.

[0003] The existing control valve has the following defects: (1) The current refueling control valve has limited functions and cannot use one valve to achieve the control of the above-mentioned multiple functions. Generally, multiple different control valves are set on the fuel tank; (2) When the existing control valve is used for refueling control, there will be a lot of noise due to the impact of the float, which affects the experience of the driver and passengers; (3) The existing control valve has a long response time when relieving pressure from high pressure to low pressure, which cannot meet the pressure relief requirements of the high-pressure fuel tank. Therefore, it is urgent to provide a multifunctional valve dedicated to the high-pressure fuel tank of hybrid vehicles that can simultaneously meet the above functions. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a multifunctional valve dedicated to a high-pressure fuel tank of a hybrid vehicle.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a multifunctional valve dedicated to the high-pressure fuel tank of a hybrid vehicle, comprising The upper cover is fixedly connected to the high-pressure oil tank, and a vent is provided on the portion located outside the high-pressure oil tank; The lower housing is located inside the high-pressure oil tank and has a first accommodating chamber and a second accommodating chamber, and the bottom of the second accommodating chamber is higher than the bottom of the first accommodating chamber; A connecting piece, the upper end of which is combined with the upper cover, the lower end of which is combined with the lower shell, and is connected between the upper cover and the lower shell as an intermediate piece; The refueling control valve assembly is arranged in the first accommodating chamber of the lower shell body, and can float up and down in the first accommodating chamber to realize the control of the refueling amount; a shock-absorbing pad is arranged at the bottom of the first accommodating chamber to avoid the noise generated by the collision between the bottom of the float of the refueling control valve assembly and the lower shell body; the refueling control valve assembly controls the refueling volume after the first refueling gun jumps to reach the rated volume of the fuel tank; The slope exhaust component is arranged in the second accommodating chamber of the lower shell and can float up and down in the second accommodating chamber to achieve exhaust; the slope exhaust component controls the exhaust performance of the high-pressure oil tank at various tilt angles; The refueling control valve assembly is arranged on the connecting piece above the slope exhaust assembly, and is used to control the refueling amount when refueling; after the gun jumps during the first refueling, the refueling control valve assembly controls the size of the single refueling volume to be added to prevent over-refueling.

[0006] Furthermore, a vent hole is provided on the side of the upper cover, and a side connected to the connecting piece is provided with an annular flange outer ring portion, a flange inner ring portion and an avoidance step surface from the outside to the inside, and their heights decrease from the outside to the inside, that is, the height of the flange outer ring portion > the height of the flange inner ring portion > the height of the avoidance step surface. The flange outer ring portion is used for welding on the high-pressure oil tank, and the end face of the flange inner ring portion abuts against the flange edge of the connecting piece for axial limitation between the upper cover and the connecting piece, and the avoidance step surface is adapted to the end face of the retaining ring of the connecting piece, and the avoidance step surface and the end face of the retaining ring are directly opposite each other up and down.

[0007] Furthermore, the connecting piece includes an upper cylinder and a lower cylinder arranged up and down, a partition is provided between the upper cylinder and the lower cylinder, and a flange is formed on the outside, the upper cylinder and the upper cover thereon jointly form a liquid collector, the liquid collector controls the static overflow and dynamic overflow of the liquid in the high-pressure oil tank, and can flow back into the oil tank; the chamber inside the liquid collector is a liquid collecting chamber, the chamber inside the lower cylinder is a connecting chamber, an upwardly protruding cap-shaped structure is provided in the liquid collecting chamber, the lateral opening of the cap-shaped structure is connected to the liquid return port on the partition, and the liquid return port connects the liquid collecting chamber and the connecting chamber; the partition opposite to the liquid return port is An oil replenishing boss is formed by the lateral upward bulge, and an oil replenishing valve seat is arranged on the oil replenishing boss, an annular positioning sleeve is arranged above the oil replenishing valve seat, and a plurality of cylindrical grooves are evenly arranged on the inner wall of the positioning sleeve along the circumferential direction, the oil replenishing control valve assembly is arranged in the positioning sleeve, and an oil replenishing air hole is arranged on the oil replenishing valve seat below the oil replenishing control valve assembly, and the lower end of the oil replenishing air hole is connected with the second accommodating chamber; the upper end of the oil replenishing air hole is a circular hole, and the lower end is a flat hole, and the bottom surface of the flat hole is an inclined slope, and the angle of the inclined slope is adapted to the angle of the slope boss of the slope exhaust assembly.

[0008] Specifically, the side wall of the upper cylinder is composed of two cylinders with different inner diameters, namely the first cylinder and the second cylinder, and the radius of the first cylinder is greater than the radius of the second cylinder. The first cylinder is located on the side of the upper cylinder away from the oil replenishing boss. An annular retaining ring is provided on the flange edge of the outer side of the upper cylinder, and a sunken groove is provided between the outer side of the first cylinder and the retaining ring. The irregular shape is used to reduce the occupied volume.

[0009] Furthermore, a first low liquid level drainage hole is provided at the bottom of the second accommodating chamber, an exhaust chamber is formed between the outer wall of the second accommodating chamber and the side wall of the lower shell body, a second low liquid level drainage hole is provided at the bottom of the exhaust chamber, and at least one high-level exhaust hole is provided on the part where the connecting piece is combined with the lower shell body, and the high-level exhaust hole is connected to the exhaust chamber.

[0010] The valve body composed of the upper cover, the connector, etc. and the high-pressure oil tank are connected by hot plate welding. During welding, overflow will be generated, which may block the high-position exhaust hole on the side of the connector. Therefore, in order to avoid the high-position exhaust hole from being blocked, further, a plurality of outwardly protruding outer convex parts are provided on the side wall of the lower cylinder, and inner concave parts are formed between adjacent outer convex parts. The outer convex parts and the inner concave parts are alternated with each other, and at least one outer convex part is provided with a high-position exhaust hole. The high-position exhaust hole includes a first high-position exhaust hole and a second high-position exhaust hole, and the outer convex part at the first high-position exhaust hole is recessed inward to form an avoidance groove, and the outer convex part below the avoidance groove is provided with a second high-position exhaust hole; the outer side of the inner concave part is provided with a radially extending block. The avoidance design is adopted at the high-position exhaust hole to reduce the quality risk of hot plate welding between the valve body and the high-pressure oil tank; at the same time, the positioning structure of concave-convex matching can realize stable and reliable connection between different parts of the valve body.

[0011] Furthermore, a baffle is provided on the upper edge of the lower shell, and a U-shaped groove for embedding the outer protrusion is formed between adjacent baffles. The baffle is provided with a clamping hole that cooperates with the clamping block. During assembly, the outer protrusion is embedded in the U-shaped groove and the clamping block is inserted into the clamping hole to achieve fixed connection and limiting between the connecting part and the lower shell.

[0012] Furthermore, the maximum flow rate of the refueling control valve assembly is greater than 350 LPM, and the maximum flow rate of the slope exhaust assembly is greater than 80 LPM.

[0013] Furthermore, the refueling control valve assembly includes a first-order refueling float, a second-order refueling float, a nylon skeleton and a first spring. The first-order refueling float includes an inner cylinder and an outer cylinder, and the upper ends of the inner cylinder and the outer cylinder are connected by a radial connecting rod to ensure that the inside and outside float up and down synchronously. The first spring is arranged between the inner cylinder and the outer cylinder, and the upper end abuts against the inner wall of the outer cylinder, and the lower end abuts against the lower shell body. The second-order refueling float is arranged at the upper end of the nylon skeleton, and the lower end of the nylon skeleton is inserted into the upper ends of the inner cylinder and the outer cylinder, and is located between the two, and can float up and down axially relative to the first-order refueling float; the second-order refueling float of the refueling control valve assembly is opened once, and the first-order refueling float is opened twice, and the first-order opening pressure is above 35Kpa, and the secondary opening pressure is above 2Kpa.

[0014] Furthermore, the slope exhaust assembly includes a first-order exhaust float, a second-order exhaust float, a second spring and a pressure block. The first-order exhaust float is a hollow cylindrical structure with an open bottom. The second spring is installed in the first-order exhaust float from bottom to top. The upper end of the second spring abuts against the first-order exhaust float, and the lower end abuts against the bottom of the second accommodating chamber. The second spring is elastically supported between the first-order exhaust float and the lower shell; the second-order exhaust float includes a slope boss, a rubber pad and a pressure block arranged on the top of the first-order exhaust float. The rubber pad is arranged on the slope boss, and the rubber pad is located at the higher end of the slope boss and is fixed on the slope boss by the pressure block, and the other end is laid downward along the slope boss to the bottom of the slope boss. At least one structural hole is also provided on the side wall of the first-order exhaust float, connecting the inner and outer sides of the first-order exhaust float; the second-order exhaust float of the slope exhaust assembly is opened once, and the first-order exhaust float is opened twice, and the first-time opening pressure is above 45Kpa, and the secondary opening pressure is above 10Kpa.

[0015] The first-stage refueling float and the second-stage refueling float of the refueling control valve assembly and the first-stage exhaust float and the second-stage exhaust float of the slope exhaust assembly are all made of phenolic resin and have excellent thermal stability and wear resistance.

[0016] Furthermore, a guide groove is axially provided on the outer wall of the exhaust first-order float, and a guide strip adapted to the guide groove is provided on the inner wall of the second accommodating cavity. During assembly, the guide strip is embedded in the guide groove, and when the exhaust first-order float floats, the guide strip can slide up and down in the guide groove.

[0017] The beneficial effects of the present invention are: (1) The valve has an integrated refueling control valve, a refueling control valve, a slope exhaust valve, and a liquid collector within a diameter of 81.5 mm. For the first time, an irregular-shaped float was used to reduce the overall valve diameter.

[0018] (2) A new material (phenolic resin) is used in the float. Compared with the previous POM or nylon materials, the thermal stability, wear resistance and dimensional stability of the float are greatly improved.

[0019] (3) When hybrid vehicles are running on pure electric power, there is no engine noise, so the quietness of the cabin is required to be higher. When the vehicle is running, especially on bumpy roads, the float in the valve body moves up and down, which will produce a collision sound. The present invention adopts a float noise reduction design and adds a rubber shock-absorbing pad, which reduces the noise decibel by 60%, meeting the low noise requirement during pure electric driving. The actual measured float noise is reduced from 70 decibels to 40 decibels.

[0020] (4) A design is adopted to prevent hot plate welding overflow and clogging, reducing the quality risk of hot plate welding between the valve and the oil tank.

[0021] (5) Both the level control valve and the slope exhaust valve adopt a two-stage opening design. The level control valve has a first opening pressure of more than 35kpa and a second opening pressure of more than 2kpa; the slope exhaust valve has a first opening pressure of more than 45kpa and a second opening pressure of more than 10kpa. The high-pressure oil tank can be depressurized from 30kpa to 2kpa in less than 5 seconds.

[0022] (6) The maximum flow rate of the liquid level control valve (refueling control valve assembly) is greater than 350LPM, and the maximum flow rate of the slope exhaust assembly is greater than 80LPM to prevent the valve from closing due to excessive flow during high-pressure pressure relief in the high-pressure tank, thereby preventing the high-pressure tank from being unable to relieve pressure.

[0023] (7) A special cap-shaped structure is designed inside the liquid collector to prevent the liquid from instantly spraying out of the valve body when the refueling gun jumps or the vehicle shakes violently.

[0024] (8) The liquid collector is designed to prevent dynamic leakage or static leakage and can flow back into the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a multifunctional valve dedicated to a high-pressure fuel tank of a hybrid vehicle according to the present invention.

[0027] Figure 2 It is a three-dimensional structural schematic diagram of a multifunctional valve dedicated to a high-pressure fuel tank of a hybrid vehicle according to the present invention.

[0028] Figure 3 It is a side structural schematic diagram of a multifunctional valve dedicated to a high-pressure fuel tank of a hybrid vehicle according to the present invention.

[0029] Figure 4 The invention is a schematic cross-sectional view of a multifunctional valve for a high-pressure fuel tank of a hybrid vehicle.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the upper cover.

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the upper cover.

[0032] Figure 7 It is a schematic diagram of the structure of the connector (forward direction).

[0033] Figure 8 It is a schematic diagram of the structure of the connector (reverse).

[0034] Fig. 9 yes Figure 7 Schematic diagram of the enlarged structure of the positioning sleeve.

[0035] Fig.10 It is a schematic diagram of the three-dimensional structure of the lower shell.

[0036] Fig.11 It is a schematic diagram of the top view of the lower shell.

[0037] Fig.12 It is a schematic diagram of the assembly structure of the lower housing, the refueling control valve assembly, and the slope exhaust assembly.

[0038] Fig.13 It is a three-dimensional structural schematic diagram of the refueling control valve assembly.

[0039] Fig.14 It is a schematic diagram of the cross-sectional structure of the refueling control valve assembly (including the lower housing).

[0040] Fig.15 It is a three-dimensional structural schematic diagram of the slope exhaust component.

[0041] Fig.16 It is a three-dimensional structural schematic diagram of the slope exhaust component.

[0042] Fig.17 It is a schematic diagram of the cross-sectional structure of the slope exhaust component.

[0043] In the figure: 1. Upper cover, 1.1. Vent, 1.2. Outer ring of flange, 1.3. Inner ring of flange, 1.4. Avoidance step surface, 2. Connector, 2.1. Upper cylinder, 2.2. Cap-shaped structure, 2.3. First high-position exhaust hole, 2.4. Avoidance groove, 2.5. Second high-position exhaust hole, 2.6. Oil replenishment boss, 2.7. Oil replenishment valve seat, 2.8. Positioning sleeve, 2.9. Cylindrical groove, 2.10. Oil replenishment hole, 2.11. Breathing hole, 2.12. Block, 2.13. Outer convex part, 2.14. Inner concave part, 2.15. Flange edge, 2.16. Sink, 2.17. Retaining ring, 2.18. Lower cylinder, 3. Lower shell, 3.1. U-shaped groove, 3.2. Baffle, 3.3. .3. Clamp hole, 3.4. First low liquid level drain hole, 3.5. Volume control window, 3.6. Second low liquid level drain hole, 3.7. First accommodating chamber, 3.8. Second accommodating chamber, 3.9. Exhaust chamber, 3.10. Guide strip, 4. Refueling control valve assembly, 4.1. First-stage refueling float, 4.1a. Inner cylinder, 4.1b. Outer cylinder, 4.2. First spring, 4.3. Second-stage refueling float, 4.4 Nylon skeleton, 4.5. Exhaust hole, 5. Refueling control valve assembly, 6. Slope exhaust assembly, 6.1. First-stage exhaust float, 6.2. Slope boss, 6.3. Guide groove, 6.4. Rubber pad, 6.5. Second spring, 6.6. Press block, 6.7. Structural hole, 7. Shock-absorbing pad. DETAILED DESCRIPTION

[0044] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0045] like Figure 1-Figure 17 As shown, a multifunctional valve dedicated to a high-pressure fuel tank of a hybrid vehicle of the present invention comprises an upper cover 1, which is fixedly connected to the high-pressure fuel tank and has a vent 1.1 on the portion located outside the high-pressure fuel tank; a lower shell 3, which is located inside the high-pressure fuel tank and has a first accommodating chamber 3.7 and a second accommodating chamber 3.8, and the bottom of the second accommodating chamber 3.8 is higher than the bottom of the first accommodating chamber 3.7; a connecting member 2, the upper end of which is combined with the upper cover 1, and the lower end of which is combined with the lower shell 3, and is connected between the upper cover 1 and the lower shell 3 as an intermediate member; Fig.12 As shown, the refueling control valve assembly 4 is arranged in the first accommodating chamber 3.7 of the lower shell 3, and can float up and down in the first accommodating chamber 3.7 to control the refueling amount; a shock-absorbing pad is provided at the bottom of the first accommodating chamber 3.7; a slope exhaust assembly 6 is arranged in the second accommodating chamber 3.8 of the lower shell 3, and can float up and down in the second accommodating chamber 3.8 to achieve exhaust; a refueling control valve assembly 5 is arranged on the connecting piece 2 above the slope exhaust assembly 6, and is used to control the refueling amount when refueling. The maximum flow rate of the refueling control valve assembly 4 is greater than 350LPM, that is, the refueling control valve does not close when the flow rate does not exceed 350LPM; the maximum flow rate of the slope exhaust assembly 6 is greater than 80LPM, that is, the slope exhaust assembly 6 does not close when the flow rate does not exceed 80LPM. Prevent the valve from closing due to excessive flow when the high-pressure oil tank is depressurized, thereby preventing the high-pressure oil tank from being unable to depressurize.

[0046] like Figure 5 and Figure 6 As shown, the side of the upper cover 1 is provided with a vent 1.1, and the side connected to the connecting member 2 is provided with an annular flange outer ring portion 1.2, a flange inner ring portion 1.3 and an avoidance step surface 1.4 from the outside to the inside, and the heights thereof decrease from the outside to the inside, that is, the height of the flange outer ring portion 1.2>the height of the flange inner ring portion 1.3>the height of the avoidance step surface 1.4, as shown in FIG. Figure 4 As shown, the flange outer ring portion 1.2 is used for welding on the high-pressure oil tank, the end face of the flange inner ring portion 1.3 abuts against the flange edge 2.15 of the connecting piece 2, and is used for axial limitation between the upper cover 1 and the connecting piece 2, and the avoidance step surface 1.4 is adapted to the end face of the retaining ring 2.17 of the connecting piece 2, and the avoidance step surface 1.4 and the end face of the retaining ring 2.17 are directly opposite to each other up and down.

[0047] like Figure 7-Figure 9As shown, the connecting member 2 includes an upper cylinder portion 2.1 and a lower cylinder portion 2.18 arranged up and down, a partition is provided between the upper cylinder portion 2.1 and the lower cylinder portion 2.18, and a flange edge 2.15 is formed on the outside, the upper cylinder portion 2.1 and the upper cover 1 thereon jointly form a liquid collector, the chamber inside the liquid collector is a liquid collecting chamber, the chamber inside the lower cylinder portion 2.18 is a connecting chamber, an upwardly protruding cap-shaped structure 2.2 is provided in the liquid collecting chamber, the lateral opening of the cap-shaped structure 2.2 is connected to the liquid return port on the partition, and the liquid return port connects the liquid collecting chamber and the connecting chamber; one side of the partition opposite to the liquid return port is bulged upward to form an oil replenishing boss 2.6, an oil replenishing valve seat 2.7 is provided on the oil replenishing boss 2.6, an annular positioning sleeve 2.8 is provided above the oil replenishing valve seat 2.7, and a plurality of cylindrical grooves 2.9 are evenly provided on the inner wall of the positioning sleeve 2.8 along the circumferential direction so that the positioning An air flow channel is formed between the positioning sleeve 2.8 and the refueling control valve assembly 5. When the refueling control valve assembly 5 is closed, the channel serves as a gas discharge channel, allowing the gas to be discharged along the cylindrical groove 2.9 on the side wall; the refueling control valve assembly 5 is arranged in the positioning sleeve 2.8, and an oil replenishing air hole 2.10 is provided on the oil replenishing valve seat 2.7 below the refueling control valve assembly 5, and the lower end of the oil replenishing air hole 2.10 is connected to the second accommodating chamber 3.8; the upper end of the oil replenishing air hole 2.10 is a circular hole, and the lower end is a flat hole, and the bottom surface of the flat hole is an inclined slope, and the angle of the inclined slope is adapted to the angle of the slope boss of the slope exhaust assembly 6; the oil replenishing air hole 2.10 serves as a ventilation and sealing hole of the slope exhaust assembly, and the flat hole at the lower end is for matching the corresponding long strip sealing gasket, i.e., the rubber gasket 6.4, and the reopening performance of this design is better. Two symmetrical breathing holes 2.11 are radially arranged on the oil replenishment valve seat 2.7 at one end of the circular hole of the oil replenishment air hole 10. The oil replenishment air hole is connected to the liquid collecting chamber through the breathing hole 2.11 and the cylindrical groove 2.9 on the side. The strip-shaped breathing hole 2.11 is an exhaust breathing hole between the oil tank and the outside when the oil replenishment control valve assembly 5 is closed. Specifically, the side wall of the upper cylinder 2.1 is composed of two sections of cylinders with different inner diameters, namely the first cylinder and the second cylinder, and the radius of the first cylinder is greater than the radius of the second cylinder. The first cylinder is located on the side of the upper cylinder 2.1 away from the oil replenishment boss 2.6. An annular retaining ring 2.17 is arranged on the flange edge 2.15 on the outer side of the upper cylinder 2.1, and a sunken sink 2.16 is arranged between the outer side of the first cylinder and the retaining ring 2.17. The irregular shape is used to reduce the occupied volume.The side wall of the lower cylinder 2.18 is provided with a plurality of outwardly protruding outer convex portions 2.13, and inner concave portions 2.14 are formed between adjacent outer convex portions 2.13. The outer convex portions 2.13 and the inner concave portions 2.14 are alternated with each other. At least one outer convex portion 2.13 is provided with a high-position exhaust hole, and the high-position exhaust hole includes a first high-position exhaust hole 2.3 and a second high-position exhaust hole 2.5. The outer convex portion 2.13 at the first high-position exhaust hole 2.3 is recessed inwardly to form an avoidance groove 2.4, and the second high-position exhaust hole 2.5 is provided on the outer convex portion 2.13 below the avoidance groove 2.4; a radially extending block 2.12 is provided on the outer side of the inner concave portion 2.14. In this embodiment, there are four outer protrusions 2.13 and four inner concave portions 2.14, which are evenly distributed along the circumferential direction. The two radially opposite outer protrusions 2.13 are provided with a first high-position exhaust hole 2.3, a second high-position exhaust hole 2.5 and an avoidance groove 2.4, and the other two outer protrusions 2.13 are not provided with exhaust holes. There is one first high-position exhaust hole 2.3, which is located at the upper part of the outer protrusion 2.13 and has a larger aperture. There are three second high-position exhaust holes 2.5, which are located at the lower part of the outer protrusion 2.13, arranged side by side, and have a smaller aperture.

[0048] like Figure 10-12 As shown, the upper edge of the lower shell 3 is provided with a baffle 3.2, and a U-shaped groove 3.1 for embedding the outer protrusion 2.13 is formed between adjacent baffles 3.2. The baffle 3.2 is provided with a clamping hole 3.3 that cooperates with the clamping block 2.12. During assembly, the outer protrusion 2.13 is embedded in the U-shaped groove 3.1, and the clamping block 2.12 is inserted into the clamping hole 3.3, so as to realize the fixed connection and limit between the connecting member 2 and the lower shell 3. The bottom of the second accommodating chamber 3.8 is provided with a first low liquid level drain hole 3.4, and an exhaust chamber 3.9 is formed between the outer wall of the second accommodating chamber 3.8 and the side wall of the lower shell 3. The bottom of the exhaust chamber 3.9 is provided with a second low liquid level drain hole 3.6, and the first high-level exhaust hole 2.3 and the second high-level exhaust hole 2.5 are both connected to the exhaust chamber 3.9. Two volume control windows 3.5 are also provided on the side wall of the lower shell 3 for volume control of the refueling control valve.

[0049] like Fig.13 and Fig.14As shown, the refueling control valve assembly 4 includes a refueling first-order float 4.1, a refueling second-order float 4.3, a nylon skeleton 4.4 and a first spring 4.2. The refueling first-order float 4.1 adopts an irregular shape to reduce the diameter of the valve as a whole. It includes an inner cylinder 4.1a and an outer cylinder 4.1b, and the upper ends of the inner cylinder 4.1a and the outer cylinder 4.1b are connected by a radial connecting rod to ensure that the inner and outer cylinders float up and down synchronously. The bottom of the inner cylinder 4.1a is located directly above the shock-absorbing pad to prevent the refueling first-order float 4.1 from directly colliding with the first accommodating chamber 3.7 of the lower shell 3 when it drops to the bottom, thereby reducing noise; the first spring The spring 4.2 is arranged between the inner tube 4.1a and the outer tube 4.1b, and the upper end thereof abuts against the inner wall of the outer tube 4.1b, and the lower end thereof abuts against the lower shell 3; the second-stage refueling float 4.3 is arranged on the upper end of the nylon skeleton 4.4, and the lower end of the nylon skeleton 4.4 is inserted between the upper ends of the inner tube 4.1a and the outer tube 4.1b, and is located between the two, and can float up and down axially relative to the first-stage refueling float 4.1; the pressure of the refueling control valve assembly 4 when it is opened once (i.e., the second-stage refueling float 4.1 is opened) is above 35Kpa, and the pressure of the second-stage refueling float 4.3 is above 2Kpa when it is opened twice (i.e., the first-stage refueling float 4.3 is opened).

[0050] like Figure 15-17 As shown, the slope exhaust assembly 6 includes an exhaust first-order float 6.1, an exhaust second-order float, a second spring 6.5 and a pressing block 6.6. The exhaust first-order float 6.1 is a hollow cylindrical structure with an open bottom. The second spring 6.5 is installed into the exhaust first-order float 6.1 from bottom to top. The upper end of the second spring 6.5 abuts against the exhaust first-order float 6.1, and the lower end abuts against the bottom of the second accommodating chamber 3.8. The second spring 6.5 is elastically supported between the exhaust first-order float 6.1 and the lower shell 3; the exhaust second-order float includes a slope boss 6.2 arranged on the top of the exhaust first-order float 6.1, a rubber pad 6.4 and a pressing block 6.6. 6, the rubber pad 6.4 is arranged on the slope boss 6.2, and the end of the rubber pad 6.4 located at the higher end of the slope boss 6.2 is fixed on the slope boss 6.2 through a pressing block 6.6, and the other end is laid downward along the slope boss 6.2 to the bottom of the slope boss 6.2. The side wall of the exhaust first-order float 6.1 is also provided with at least one structural hole 6.7, which connects the inner and outer sides of the exhaust first-order float 6.1. In this embodiment, there are two structural holes 6.7; the pressure of the slope exhaust component 6 when it is opened once (the exhaust second-order float 6.1 is opened) is above 45Kpa, and the pressure of the second opening (the exhaust first-order float is opened) is above 10Kpa. A guide groove 6.3 is axially arranged on the outer wall of the exhaust first-stage float 6.1, and a guide strip 3.10 adapted to the guide groove 6.3 is arranged on the inner wall of the second accommodating chamber 3.8. During assembly, the guide strip 3.10 is embedded in the guide groove 6.3, and when the exhaust first-stage float 6.1 floats, the guide strip 3.10 can slide up and down in the guide groove 6.3.

[0051] In this embodiment, the refueling first-order float 4.1, the refueling second-order float 4.3 of the refueling control valve assembly 4, and the exhaust first-order float 6.1 and the exhaust second-order float of the slope exhaust assembly 6 are all made of phenolic resin material, which has excellent thermal stability and wear resistance. Phenolic resin is a thermosetting material, and the mass production molding dimensional tolerance can reach ±0.02, while the tolerance of ordinary materials such as POM nylon is only ±0.2. The higher the dimensional stability, the greater the reliability of the float floating up and down. At the same time, phenolic resin is also better than POM and nylon in wear resistance and high and low temperature resistance. The specific gravity of phenolic resin material is twice that of POM or nylon, which is easier to achieve small volume and large weight.

[0052] Working principle of refueling control valve assembly 4: When the pressure is high, the first-stage refueling float 4.1 and the second-stage refueling float 4.3 are both forced to float upward, press against the return port of the partition, and close the return port of the liquid collector; when the pressure drops to 35Kpa, the first-stage refueling float 4.1 falls, so that the exhaust hole 4.5 in the middle of the second-stage refueling float 4.3 opens to exhaust, and continues to exhaust; when the pressure is further reduced to 2Kpa, the second-stage refueling float 4.3 falls, and the return port at the bottom of the liquid collector opens, so that the inside of the oil tank is connected to the vent 1.1 through the liquid collector, and the oil vapor in the oil tank is sent to the carbon canister through the vent 1.1, and then released to the atmosphere after being filtered by the carbon canister. During the working process, when the oil is refueled to the rated volume of the oil tank, when the sum of the liquid buoyancy and the elastic force of the first spring 4.2 is greater than the weight of the float, the first spring 4.2 moves upward to block the exhaust hole 4.5, causing the refueling gun to jump, and the refueling is completed.

[0053] Slope exhaust assembly 6 working principle: At high pressure, the exhaust first-order float 6.1 and the exhaust second-order float are both forced to float upward, so that the exhaust second-order float rubber pad 6.4 fits tightly with the inclined slope of the flat hole at the bottom of the oil filling hole 2.10, closing the oil filling hole 2.10. When the pressure drops to 45Kpa, the exhaust first-order float 6.1 falls, pulling the exhaust second-order float (i.e. rubber pad 6.4) to deform, and initially opening a small opening for exhaust; when the pressure drops further, since the bottom of the oil filling hole 2.10 is an inclined slope, during the process of lowering the pressure, the exhaust second-order float is gradually pulled downward, and the oil filling hole 2.10 gradually opens, until the pressure drops to 10Kpa, the oil filling hole 2.10 is fully opened for exhaust. During operation, when the gasoline in the fuel tank shakes into the valve cavity, the second spring 6.5 moves upward, so that the float of the slope exhaust assembly blocks the upper oil filling hole 2.10, preventing the gasoline liquid from entering the exhaust hole and flowing into the carbon canister.

[0054] The refueling control valve assembly 5 does not open during refueling, limiting the flow rate to control the amount of refueling.

[0055] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A multifunctional valve for a high pressure fuel tank of a hybrid vehicle, characterized in that: include The upper cover is fixedly connected to the high-pressure oil tank, and a vent is provided on the portion located outside the high-pressure oil tank; The lower housing is located inside the high-pressure oil tank and has a first accommodating chamber and a second accommodating chamber, and the bottom of the second accommodating chamber is higher than the bottom of the first accommodating chamber; A connecting piece, the upper end of which is combined with the upper cover, the lower end of which is combined with the lower shell, and is connected between the upper cover and the lower shell as an intermediate piece; The refueling control valve assembly is arranged in the first accommodating chamber of the lower shell and can float up and down in the first accommodating chamber to control the refueling amount; a shock-absorbing pad is provided at the bottom of the first accommodating chamber; The gradient exhaust assembly is arranged in the second accommodating chamber of the lower shell and can float up and down in the second accommodating chamber to achieve exhaust; The refueling control valve assembly is arranged on the connecting piece above the slope exhaust assembly and is used to control the refueling amount when refueling.

2. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 1, characterized in that: A vent hole is provided on the side of the upper cover, and a side connected to the connecting piece is provided with an annular flange outer ring portion, a flange inner ring portion and an avoidance step surface from the outside to the inside, and the height thereof decreases from the outside to the inside. The flange outer ring portion is used for welding on the high-pressure oil tank, and the end face of the flange inner ring portion abuts against the flange edge of the connecting piece for axial limitation between the upper cover and the connecting piece, and the avoidance step surface is adapted to the end face of the retaining ring of the connecting piece.

3. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 1, characterized in that: The connecting member comprises an upper cylinder and a lower cylinder arranged up and down, a partition is arranged between the upper cylinder and the lower cylinder, and a flange is formed on the outside, the upper cylinder and the upper cover thereon jointly form a liquid collector, the chamber inside the liquid collector is a liquid collecting chamber, the chamber inside the lower cylinder is a connecting chamber, an upwardly protruding cap-shaped structure is arranged in the liquid collecting chamber, the lateral opening of the cap-shaped structure is connected with the liquid return port on the partition, and the liquid return port connects the liquid collecting chamber and the connecting chamber; one side of the partition opposite to the liquid return port is upwardly protruded to form an oil replenishing boss, the An oil replenishing valve seat is provided on the oil replenishing boss, an annular positioning sleeve is provided above the oil replenishing valve seat, a plurality of cylindrical grooves are evenly provided on the inner wall of the positioning sleeve along the circumferential direction, the oil replenishing control valve assembly is arranged in the positioning sleeve, an oil replenishing air hole is provided on the oil replenishing valve seat below the oil replenishing control valve assembly, and the lower end of the oil replenishing air hole is connected with the second accommodating chamber; the upper end of the oil replenishing air hole is a circular hole, and the lower end is a flat hole, and the bottom surface of the flat hole is an inclined slope, and the angle of the inclined slope is adapted to the slope exhaust assembly.

4. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 3, characterized in that: A first low liquid level drainage hole is provided at the bottom of the second accommodating chamber, an exhaust chamber is formed between the outer wall of the second accommodating chamber and the side wall of the lower shell body, a second low liquid level drainage hole is provided at the bottom of the exhaust chamber, and at least one high-level exhaust hole is provided on the part where the connecting piece is combined with the lower shell body, and the high-level exhaust hole is connected to the exhaust chamber.

5. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 4, characterized in that: The side wall of the lower cylinder is provided with a plurality of outwardly protruding outer convex parts, and inner concave parts are formed between adjacent outer convex parts. At least one outer convex part is provided with a high-position exhaust hole, and the high-position exhaust holes include a first high-position exhaust hole and a second high-position exhaust hole, and the outer convex part at the first high-position exhaust hole is recessed inwardly to form an avoidance groove, and the second high-position exhaust hole is provided on the outer convex part below the avoidance groove; a radially extending block is provided on the outer side of the inner concave part.

6. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 5, characterized in that: A baffle is provided on the upper edge of the lower shell, and a U-shaped groove for embedding the outer protrusion is formed between adjacent baffles. A clamping hole matching with the clamping block is provided on the baffle.

7. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 1, characterized in that: The maximum flow rate of the refueling control valve assembly is greater than 350 LPM, and the maximum flow rate of the slope exhaust assembly is greater than 80 LPM.

8. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 1, characterized in that: The refueling control valve assembly includes a first-order refueling float, a second-order refueling float, a nylon skeleton and a first spring. The first-order refueling float includes an inner cylinder and an outer cylinder, and the upper ends of the inner cylinder and the outer cylinder are connected by a radial connecting rod. The first spring is arranged between the inner cylinder and the outer cylinder, and the upper end abuts against the inner wall of the outer cylinder, and the lower end abuts against the lower shell body. The second-order refueling float is arranged at the upper end of the nylon skeleton, and the lower end of the nylon skeleton is inserted in the upper ends of the inner cylinder and the outer cylinder, and is located between the two, and can float up and down axially relative to the first-order refueling float; the second-order refueling float of the refueling control valve assembly is opened once, and the first-order refueling float is opened twice, and the first-order opening pressure is above 35Kpa, and the secondary opening pressure is above 2Kpa.

9. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 1, characterized in that: The slope exhaust assembly includes a first-order exhaust float, a second-order exhaust float, a second spring and a pressure block. The first-order exhaust float is a hollow cylindrical structure with an open bottom. The second spring is installed in the first-order exhaust float from bottom to top. The upper end of the second spring abuts against the first-order exhaust float, and the lower end abuts against the bottom of the second accommodating chamber. The second spring is elastically supported between the first-order exhaust float and the lower shell; the second-order exhaust float includes a slope boss, a rubber pad and a pressure block arranged on the top of the first-order exhaust float, and the rubber pad is arranged on the slope boss, and the rubber pad is located at the end of the slope boss higher and is fixed on the slope boss by the pressure block, and the other end is laid down along the slope boss to the bottom of the slope boss. At least one structural hole is also provided on the side wall of the first-order exhaust float, which connects the inner and outer sides of the first-order exhaust float; the second-order exhaust float of the slope exhaust assembly is opened once, and the first-order exhaust float is opened twice, and the first-time opening pressure is above 45Kpa, and the secondary opening pressure is above 10Kpa.

10. The multifunctional valve for a high pressure fuel tank of a hybrid vehicle as claimed in claim 9, characterized in that: A guide groove is axially arranged on the outer wall of the exhaust first-stage float, and a guide strip adapted to the guide groove is arranged on the inner wall of the second accommodating cavity. During assembly, the guide strip is embedded in the guide groove and can slide up and down in the guide groove.

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