Isolation valve of high-pressure oil tank

Abstract

The utility model provides a high-pressure oil tank isolating valve which comprises a shell, a coil assembly, a vent valve assembly and a pressure release valve assembly. A first cavity communicated with a fuel tank and a second cavity communicated with a carbon tank are arranged in the shell; a central through hole and a circumferential through hole are formed in the partition plate, the pressure release valve assembly is movably arranged in the second cavity, a guide piece is arranged in the second cavity and is perpendicular to the partition plate, and a guide groove matched with the guide piece is formed in the pressure release valve assembly; by arranging the guide piece and the guide groove which are matched with each other, the guide piece slides in the guide groove in the process that the pressure release valve body gets close to or gets away from the partition plate, and therefore the moving path of at least one part of the pressure release valve assembly in the process of getting close to or getting away from the partition plate is limited; the pressure release valve assembly can be prevented from deviating and inclining in the moving process, the sealing reliability of a product can be improved, and the service life of the product is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of isolation valve technology, and more specifically, to a high-pressure oil tank isolation valve. Background Technology

[0002] With the increasing severity of vehicle exhaust pollution, emission regulations have become increasingly stringent, restricting vehicle emissions to the atmosphere. This has also spurred the rapid development of hybrid electric vehicle technology. Currently, hybrid vehicles, including plug-in hybrid electric vehicles (PHEVs) and range-extended hybrid electric vehicles (REEVs), have gradually become the most accepted vehicle types for the general public after several years of technological accumulation.

[0003] Hybrid vehicles not only offer excellent fuel economy but also allow for switching between engine and battery operation, effectively alleviating range anxiety associated with the unstable range of pure electric vehicles. However, in hybrid vehicles, the switching between the fuel system and the electrical system can lead to frequent transfer of fuel vapors from the fuel tank to the carbon canister, potentially saturating it or even venting it directly into the atmosphere. Currently, fuel tank isolation valves are typically used to strictly control the release of fuel vapors from the fuel tank to the carbon canister.

[0004] In existing technology, the internal structure of the tank isolation valve is divided into upper and lower chambers by a central partition. A mechanical valve pressure relief channel is designed at the center of the partition. Solenoid valve pressure relief channels are evenly distributed around the central channel. The solenoid valve pressure relief channels are sealed in the upper chamber using a rubber seal, while the mechanical valve pressure relief is achieved in the lower chamber using the same rubber seal. However, during the mechanical valve pressure relief process, the valve plate is difficult to position accurately, and jamming or misalignment can easily occur during the return process, leading to mechanical pressure relief valve malfunction.

[0005] Therefore, the existing technology has the technical problem that the valve plate of the existing pressure relief valve is difficult to position accurately, and it is easy to get stuck or deviate during use, which leads to the failure of the mechanical pressure relief valve. Utility Model Content

[0006] The main purpose of this utility model is to provide a high-pressure oil tank isolation valve to solve the technical problem that the valve plate of the pressure relief valve is difficult to position accurately, and is prone to jamming or displacement during use, thus leading to mechanical pressure relief valve failure.

[0007] To achieve the above objectives, according to one aspect of the present invention, a high-pressure fuel tank isolation valve is provided, comprising: a housing, a coil assembly, a vent valve assembly, and a pressure relief valve assembly; the housing contains a first cavity and a second cavity; the first cavity is arranged above the second cavity, and the first cavity and the second cavity are separated by a partition; the first cavity has a first channel for communicating with a fuel tank, and the second cavity has a second channel for communicating with a carbon canister; the partition has a central through hole connecting the first cavity and the second cavity, and a circumferential through hole arranged around the central through hole; characterized in that the pressure relief valve assembly is movably disposed in the second cavity, at least a portion of the pressure relief valve assembly can approach or move away from the partition to block or open the central through hole, a guide member is disposed in the second cavity, the guide member is disposed perpendicular to the partition, and the pressure relief valve assembly has a guide groove matching the guide member.

[0008] Furthermore, the guide member extends from the partition towards the second cavity.

[0009] Furthermore, the guide element is a guide rib or a guide post.

[0010] Furthermore, at least two guide members are provided, and the guide members are evenly distributed in a circle around the central through hole.

[0011] Furthermore, the pressure relief valve assembly includes a first spring, a pressure relief valve body, and a pressure relief valve seat. The first spring abuts against the pressure relief valve seat and the pressure relief valve body, thereby causing the pressure relief valve body to elastically press against the lower surface of the partition to block the air passage through the central through hole.

[0012] Furthermore, the pressure relief valve body includes a bracket and a first elastic sealing part. The first elastic sealing part is located on the side of the bracket near the first cavity. The side of the first elastic sealing part facing the partition is provided with a concave arc-shaped sealing surface. The guide groove is provided on the outer peripheral surface of the bracket. During the process of the pressure relief valve body approaching or moving away from the partition, the guide member always slides in the guide groove.

[0013] Furthermore, the bracket also has a skirt extending away from the first cavity, and a spring abutment portion for abutting the first spring is formed between the skirt and the guide groove.

[0014] Furthermore, the central through hole is a cylindrical hole, and the hole wall of the cylindrical hole extends from the partition to the second cavity. The pressure relief valve assembly can press against the lower surface of the cylindrical hole under the bias of the elastic force to seal the cylindrical hole.

[0015] Furthermore, the vent valve assembly is located within the first cavity. The vent valve assembly includes a guide post, an armature, a second spring, and a vent valve body. The armature is provided with a receiving hole for accommodating the guide post. The second spring is located on the side of the armature away from the second cavity and is sleeved on the outside of the guide post. The vent valve body is connected to the side of the armature near the second cavity. The vent valve body can move in a direction close to or away from the partition under the drive of the armature to block or open the circumferential through hole.

[0016] Furthermore, the vent valve body includes a vent valve body and a second elastic sealing part. The second elastic sealing part is located on the side of the vent valve body facing the partition plate. The second elastic sealing part is arranged in an annular shape to seal the circumferential through hole. The vent valve body has a vent hole in the middle that can communicate with the central through hole.

[0017] The high-pressure oil tank isolation valve provided by this utility model, by setting mutually matched guide members and guide grooves, allows the guide members to slide in the guide grooves as the pressure relief valve body approaches or moves away from the partition, thereby limiting the movement path of at least a part of the pressure relief valve assembly as it approaches or moves away from the partition. This can prevent the pressure relief valve assembly from being offset or skewed during movement, which is beneficial to improving the reliability of the product seal and extending the product's service life. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the high-pressure oil tank isolation valve according to the present invention is shown;

[0020] Figure 2 A schematic diagram of the structure of the pressure relief valve assembly according to the present invention is shown;

[0021] Figure 3 A cross-sectional view of the pressure relief valve body according to the present invention is shown;

[0022] Figure 4 A perspective structural diagram of the pressure relief valve body according to the present invention is shown;

[0023] Figure 5 A schematic diagram of the structure of the housing according to the present invention is shown;

[0024] Figure 6 A schematic diagram of the flow path of the high-pressure oil tank isolation valve according to the present invention in the depressurization state is shown;

[0025] Figure 7 A schematic diagram of the flow path of the high-pressure oil tank isolation valve according to the present invention in the air replenishment state is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Housing; 11. First cavity; 111. First channel; 12. Second cavity; 121. Second channel; 13. Partition; 131. Central through hole; 132. Circumferential through hole; 133. Guide component; 20. Coil assembly; 30. Vent valve assembly; 31. Guide post; 32. Armature; 33. Second spring; 34. Vent valve body; 341. Vent valve body; 3411. Vent hole; 342. Second elastic sealing part; 40. Pressure relief valve assembly; 41. First spring; 42. Pressure relief valve body; 421. Bracket; 4211. Guide groove; 4212. Skirt; 422. First elastic sealing part; 4221. Arc-shaped sealing surface; 43. Pressure relief valve seat. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] With increasingly stringent emission regulations, existing technologies typically employ tank isolation valves to strictly control the emission of vaporized fuel from the tank to the carbon canister. Generally, the tank isolation valve divides the interior of the housing into upper and lower chambers via a central partition. A mechanical valve relief channel is designed at the center of the partition. Solenoid valve relief channels are evenly distributed around the central channel. The solenoid valve relief channels in the upper chamber are sealed with rubber seals, while the mechanical valve relief is achieved in the lower chamber through the same rubber seals. However, during mechanical valve relief, the valve plate is difficult to position accurately, and jamming or misalignment may occur during movement, easily leading to mechanical valve malfunction.

[0032] To address the difficulty in accurately positioning the valve plate in the aforementioned isolation valve and to prevent potential jamming or displacement during movement, this utility model provides a high-pressure oil tank isolation valve.

[0033] like Figures 1 to 7As shown, this utility model provides a high-pressure fuel tank isolation valve, which includes a housing 10, a coil assembly 20, a vent valve assembly 30, and a pressure relief valve assembly 40. The housing 10 contains a first cavity 11 and a second cavity 12. The first cavity 11 is positioned above the second cavity 12, and the first cavity 11 and the second cavity 12 are separated by a partition 13. The first cavity 11 has a first channel 111 for communication with the fuel tank, and the second cavity 12 has a second channel 121 for communication with the carbon canister. Thus, the housing 10 is connected to the fuel tank via the first channel 111 and to the carbon canister via the second channel 121. The partition 13 is provided with a central through hole 131 connecting the first cavity 11 and the second cavity 12, and a circumferential through hole 132 arranged around the central through hole 131. The pressure relief valve assembly 40 is movably disposed in the second cavity 12. At least a part of the pressure relief valve assembly 40 can approach or move away from the partition 13 to block or open the central through hole 131. A guide member 133 is provided in the second cavity 12. The guide member 133 is arranged perpendicular to the partition 13. The pressure relief valve assembly 40 is provided with a guide groove 4211 that matches the guide member 133. Thus, as the pressure relief valve assembly 40 approaches or moves away from the partition 13, the guide member 133 can reciprocate within the guide groove 4211 to limit the movement path of at least a part of the pressure relief valve assembly 40 as it approaches or moves away from the partition 13.

[0034] The high-pressure oil tank isolation valve provided by this utility model, through the setting of mutually matched guide members 133 and guide grooves 4211, allows the guide members 133 to slide within the guide grooves 4211 as the pressure relief valve body 42 approaches or moves away from the partition 13. This limits the movement path of at least a part of the pressure relief valve assembly 40 as it approaches or moves away from the partition 13, thus preventing the pressure relief valve assembly 40 from being offset or tilted during movement. This is beneficial for improving the reliability of the product's seal and extending the product's service life.

[0035] To facilitate product processing, the guide member 133 can extend from the partition 13 toward the second cavity 12. Preferably, the guide member 133 and the partition 13 can be integrally injection molded. This processing method helps to ensure product consistency and also improves product production efficiency.

[0036] Specifically, the guide member 133 is a guide rib or guide post extending from the partition plate 13 toward the second cavity 12; wherein, at least two guide members 133 are provided, and the guide members 133 are evenly distributed in a circle around the central through hole 131, so as to limit the movement path of the pressure relief valve assembly 40 in the axial direction, and at the same time, to prevent the pressure relief valve assembly 40 from tilting in the circumferential direction.

[0037] Preferably, there are three guide members 133, which are spaced 120 degrees apart from each other. The three guide members 133 can limit the movement path of the pressure relief valve assembly 40 and also achieve the self-centering effect of the pressure relief valve assembly.

[0038] like Figure 2 As shown, the pressure relief valve assembly 40 includes a first spring 41, a pressure relief valve body 42, and a pressure relief valve seat 43. The first spring 41 abuts against the pressure relief valve seat 43 and the pressure relief valve body 42, thereby causing the pressure relief valve body 42 to elastically press against the lower surface of the partition 13 to block the air passage through the central through hole 131.

[0039] During use, when the first chamber 11 receives positive pressure from the fuel tank, a force will act on the pressure relief valve body 42. Under the action of the positive pressure from the fuel tank, the pressure relief valve body 42 overcomes the spring force of the first spring 41 and moves downward, thereby opening the central through hole and realizing gas communication between the first chamber 11 and the second chamber 12. When the bottom end of the pressure relief valve body 42 contacts the pressure relief valve seat 43, it cannot move further due to the limit problem. This situation is the maximum movement state of the pressure relief valve body 42, which can avoid the situation where the pressure relief valve has difficulty returning to its original position under high pressure.

[0040] Specifically, such as Figures 2 to 4 As shown, the pressure relief valve body 42 includes a bracket 421 and a first elastic sealing part 422. The first elastic sealing part 422 is located on the side of the bracket 421 near the first cavity 11, and is made of rubber. The first elastic sealing part 422 can be fixed to the bracket 421 by vulcanization, thereby achieving a fixed connection between the first elastic sealing part 422 and the bracket 421. The side of the first elastic sealing part 422 facing the partition 13 is provided with a concave arc-shaped sealing surface 4221. Using the arc-shaped sealing surface 4221 as the sealing surface of the pressure relief channel connecting the first cavity 11 and the second cavity 12, the sealing surface can have a larger deformation under the same spring force, thus giving the sealing surface a greater supporting force. At the same time, under the combined action of the arc-shaped sealing surface and the pressure relief guide 133, the first elastic sealing part 422 can better form a self-centering sealing contact with the lower surface of the central channel. This arrangement helps to further improve the sealing reliability of the product.

[0041] The guide groove 4211 is provided on the outer peripheral surface of the bracket 421. As the pressure relief valve body 42 moves closer to or away from the partition 13, the guide member 133 always slides in the guide groove 4211, thereby further ensuring the centering and smoothness of the pressure relief valve body 42 during its movement.

[0042] Furthermore, the bracket 421 also has a skirt 4212 extending away from the first cavity 11, and a spring abutment portion for the first spring 41 to abut between the skirt 4212 and the guide groove 4211.

[0043] The pressure relief valve seat 43 is tightly fitted and pressurized with the housing 10. The pressure relief valve seat 43 is also provided with a frustum for supporting the first spring 41, which is beneficial for the assembly and positioning of the first spring 41.

[0044] In another embodiment of this application, the central through hole 131 is a cylindrical hole, and the hole wall of the cylindrical hole extends from the partition 13 to the second cavity 12. The pressure relief valve assembly 40 can press against the lower surface of the cylindrical hole under the bias of the elastic force to seal the cylindrical hole.

[0045] Furthermore, such as Figure 6 , Figure 7 As shown, the vent valve assembly 30 is located in the first cavity 11. The vent valve assembly 30 includes a guide post 31, an armature 32, a second spring 33, and a vent valve body 34. The armature 32 is provided with a receiving hole for accommodating the guide post 31. The second spring 33 is located on the side of the armature 32 away from the second cavity 12 and is sleeved on the outside of the guide post 31. The vent valve body 34 is connected to the side of the armature 32 close to the second cavity 12. The vent valve body 34 can move in the direction close to or away from the partition 13 under the drive of the armature 32 to block or open the circumferential through hole 132.

[0046] During use, when negative pressure is transmitted from the fuel tank end, the negative pressure overcomes the spring force of the second spring 33, causing the armature 32 to move upward through the guide post 31, thereby further driving the vent valve body 34 to separate from the partition plate 13, opening the flow channel of the circumferential through hole 132, so that the internal pressure of the fuel tank is replenished, and the pressure balance of the fuel tank is achieved.

[0047] Specifically, the vent valve body 34 includes a vent valve body 341 and a second elastic sealing part 342. The second elastic sealing part 342 is located on the side of the vent valve body 341 facing the partition plate 13. The second elastic sealing part 342 is arranged in an annular shape to seal the circumferential through hole 132. The vent valve body 341 has a vent hole 3411 in the middle that can communicate with the central through hole 131, so that the pressure of the oil tank can act on the pressure relief valve seat 43 through the vent hole.

[0048] The high-pressure oil tank isolation valve provided by this utility model has four working conditions during use: normal normally closed working condition, coil energized pressure relief working condition, mechanical valve pressure relief working condition under high oil tank pressure condition, and air replenishment working condition under negative oil tank pressure condition.

[0049] Under normal operating conditions, such as Figure 1As shown, when the coil is de-energized, the vent valve body 34 seals the circumferential through hole 132 under the spring force of the second spring 33, and the pressure relief valve body 42 seals the central through hole 131 under the spring force of the first spring 41. The coil used in this application is an electromagnetic coil, which is a commercially available standard part. This application does not limit the specific structure and form of the electromagnetic coil.

[0050] Under the depressurization condition of the coil being energized, the coil assembly 20 is energized through the connector, which drives the armature 32 to overcome the spring force of the second spring 33 and lift it upward, so that the airflow can quickly pass through the airflow channel on the partition 13.

[0051] Under the condition of automatic pressure relief of the fuel tank, such as Figure 6 As shown, when a vehicle is parked for a long time or under extreme weather conditions of high and low temperatures, the gasoline in the fuel tank will continuously evaporate under external conditions such as temperature, causing the internal pressure of the fuel tank to rise. The pressure inside the fuel tank will act on the pressure relief valve body 42 through the vent on the vent valve body 341, overcoming the spring force of the first spring 41 and moving downward, thereby opening the central through hole and realizing the self-depressurization of the fuel tank.

[0052] Under the condition of air replenishment, such as Figure 7 As shown, when negative pressure is transmitted from the fuel tank end, the negative pressure overcomes the spring force of the second spring 33, causing the armature 32 to move upward through the guide post 31, thereby further driving the vent valve body 34 to separate from the partition plate 13, opening the flow channel of the circumferential through hole 132, so that the internal pressure of the fuel tank is replenished, and the pressure balance of the fuel tank is achieved.

[0053] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high pressure tank isolation valve, comprising a housing, a coil assembly, a breather valve assembly and a pressure relief valve assembly; a first cavity and a second cavity are arranged in the housing; the first cavity is arranged above the second cavity, and the first cavity and the second cavity are separated by a partition; the first cavity is provided with a first channel for communicating with a fuel tank, and the second cavity is provided with a second channel for communicating with a carbon canister; a central through hole for communicating the first cavity and the second cavity and a circumferential through hole arranged at the periphery of the central through hole are arranged on the partition, characterized in that, The pressure relief valve assembly is movably arranged in the second cavity, at least a part of the pressure relief valve assembly can be close to or away from the partition plate to block or open the central through hole, a guide member is arranged in the second cavity, the guide member is arranged perpendicularly to the partition plate, and a guide groove matched with the guide member is arranged on the pressure relief valve assembly.

2. The high pressure oil tank isolation valve according to claim 1, characterized in that The guide member extends from the partition plate to the second cavity.

3. The high pressure oil tank isolation valve according to claim 1, characterized in that, The guide member is a guide rib or a guide column.

4. The high pressure oil tank isolation valve according to claim 1, characterized in that, The guide member is arranged in at least two, and the guide members are uniformly distributed in a circle centering on the central through hole.

5. The high pressure oil tank isolation valve according to claim 1, characterized in that, The pressure relief valve assembly comprises a first spring, a pressure relief valve body and a pressure relief valve seat, the first spring is abutted between the pressure relief valve seat and the pressure relief valve body, so that the pressure relief valve body is elastically pressed against the lower surface of the partition plate to block the air passage passing through the central through hole.

6. The high pressure oil tank isolation valve according to claim 5, characterized in that The pressure relief valve body comprises a bracket and a first elastic sealing part, the first elastic sealing part is located on the side of the bracket close to the first cavity, an inner concave arc-shaped sealing surface is arranged on the side of the first elastic sealing part facing the partition plate, and the guide groove is arranged on the outer circumferential surface of the bracket, the guide member always slides in the guide groove in the process that the pressure relief valve body is close to or away from the partition plate.

7. The high pressure oil tank isolation valve according to claim 6, characterized in that The bracket further has a skirt extending away from the first cavity, and a spring abutting part for the first spring to abut is formed between the skirt and the guide groove.

8. The high pressure oil tank isolation valve according to claim 1, characterized in that, The central through hole is a cylindrical hole, the hole wall of the cylindrical hole extends from the partition plate to the second cavity, and the pressure relief valve assembly can be biased against the lower surface of the cylindrical hole under the elastic force to seal the cylindrical hole.

9. The high pressure oil tank isolation valve according to claim 1, characterized in that, The air vent valve assembly is arranged in the first cavity, the air vent valve assembly comprises a guide column, an armature, a second spring and an air vent valve body, the armature is provided with an accommodating hole for accommodating the guide column, the second spring is located on the side of the armature away from the second cavity and is sleeved on the outer side of the guide column, the air vent valve body is connected to the side of the armature close to the second cavity, and the air vent valve body can be driven by the armature to move in the direction close to or away from the partition plate to block or open the circumferential through hole.

10. The high pressure oil tank isolation valve according to claim 9, characterized in that The air vent valve body comprises an air vent valve body and a second elastic sealing part, the second elastic sealing part is arranged on the side of the air vent valve body facing the partition plate, the second elastic sealing part is arranged in a ring shape to seal the circumferential through hole, and a gas permeable hole capable of communicating with the central through hole is arranged in the middle of the air vent valve body.

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