Fuel tank isolation valve

Abstract

A fuel tank isolation valve, relating to the field of automotive valves. The fuel tank isolation valve comprises: an isolation valve body, wherein a valve cavity is provided in the isolation valve body, and a partition plate is provided in the valve cavity; and a solenoid valve, which is mounted on the isolation valve body and comprises a movable iron core extending into the valve cavity, wherein a plug is arranged at the front end of the movable iron core, the plug directly faces the partition plate, and a first spring abuts against the side of the movable iron core away from the partition plate. The fuel tank isolation valve further comprises: a temporary power-off pressure relief device, which comprises a limiting seat, a sliding seat and a conversion device, wherein the sliding seat is arranged at the front end of a valve body of the solenoid valve, and the limiting seat is arranged on the movable iron core; the limiting seat and the sliding seat are respectively provided with a locking protrusion and a convex ridge that are axially opposite each other; the conversion device is configured to convert an axial driving force of the movable iron core on the limiting seat into a force for driving the limiting seat to rotate unidirectionally in a circumferential direction; and a first sliding groove for accommodating the axial sliding of the locking protrusion is provided on one side of the convex ridge. The fuel tank isolation valve can achieve a temporary power-off pressure relief function.

Description

Fuel tank isolation valve TECHNICAL FIELD

[0001] The present application relates to the field of automobile valves, in particular to a fuel tank isolation valve. BACKGROUND

[0002] For the oil vapor system, in order to cooperate and meet various working conditions of the engine, the fuel tank isolation valve can maintain and adjust the pressure in the fuel tank and its related pipelines, and control the flow rate when the fuel tank is depressurized to not exceed the preset value.

[0003] However, in the production process of the motor vehicle, before the vehicle is powered on after the fuel tank and the fuel tank isolation valve are assembled on the assembly line, the fuel tank is pre-filled with oil for subsequent testing and starting. At this time, since it is in an unpowered state, the existing fuel tank isolation valve is in a power-off normally closed state, which prevents the fuel tank from being vented to the atmosphere, and the air in the tank cannot be quickly discharged during the oil filling process, which affects the oil filling efficiency and further affects the assembly efficiency of the motor vehicle. Therefore, a fuel tank isolation valve capable of temporarily interrupting power and depressurizing is needed. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a fuel tank isolation valve capable of temporarily interrupting power and depressurizing.

[0005] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: a fuel tank isolation valve, comprising: an isolation valve body, a valve cavity is provided in the isolation valve body, a partition plate is provided in the valve cavity, and a through hole communicating the flow channels on both sides of the partition plate is provided on the partition plate; an electromagnetic valve is installed on the isolation valve body, the electromagnetic valve comprises a movable iron core extending into the valve cavity, a plug is provided at the front end of the movable iron core, the plug faces the partition plate, and a first spring abuts against the side of the movable iron core away from the partition plate; a pressure maintaining state: the electromagnetic valve is de-energized, the first spring pushes the movable iron core to block the through hole with the plug; a first depressurization state: the electromagnetic valve is energized, the movable iron core is retracted away from the partition plate to open the through hole; further comprising: a temporary power interruption and depressurization device, the temporary power interruption and depressurization device comprises a limiting seat, a sliding seat and a conversion device, the sliding seat is arranged at the front end of the electromagnetic valve body, and the limiting seat is arranged on the movable iron core; a second depressurization state: the electromagnetic valve is de-energized, the first spring pushes the movable iron core to abut against the limiting seat and the sliding seat in the axial direction to limit the plug from blocking the through hole, correspondingly, the limiting seat and the sliding seat are respectively provided with axially opposite locking convexes and eaves; the conversion device is used to convert the axial driving force of the movable iron core on the limiting seat to drive the limiting seat to rotate in one direction; one side of the eaves is provided with a first sliding groove for accommodating the axial sliding of the locking convex; further comprising a rotation blocking structure, after the locking convex is rotated into the first sliding groove, the blocking structure is used to limit the limiting seat from continuing to rotate in the circumferential direction.

[0006] Further, the oil tank isolation valve in the application, the conversion device includes a circumferential locking driving part, the driving part is arranged on one side of the limiting seat in the axial direction, the driving part is provided with a driving tooth near the limiting seat, and a transmission tooth is arranged on the limiting seat opposite to the driving tooth, and a guide slope is arranged between the driving tooth and the transmission tooth; after the electromagnetic valve is powered on, the movable iron core axially extrudes the limiting seat and the driving part, and the driving tooth is axially pressed and combined with the transmission tooth, at this time, the guide slope is used for driving the transmission tooth to rotate in the circumferential direction. As a preferred scheme of the application, the wedge-shaped cooperation between the driving tooth and the transmission tooth can convert the axial pressure output by the movable iron core into a rotating driving force.

[0007] Preferably, the oil tank isolation valve in the application, the driving part is a pressure plate, the pressure plate is arranged on one side of the limiting seat close to the plug, the pressure plate is arranged on the movable iron core, the driving tooth is arranged on the pressure plate, and a transmission tooth is arranged on the limiting seat opposite to the driving tooth, the limiting seat is slidably arranged on the movable iron core, and a limiting support part is arranged on the side of the limiting seat away from the plug; after the electromagnetic valve is powered on, the movable iron core axially drives the pressure plate to axially press and combine the driving tooth with the transmission tooth, at this time, the limiting support part is used for supporting the limiting seat.

[0008] Further, the oil tank isolation valve in the application, a circumferential locking structure is arranged between the pressure plate and the sliding seat, including a positioning convex extending on the outer side of the pressure plate and a second sliding groove arranged on the inner side of the sliding seat in the axial direction, and the positioning convex is slidably arranged in the second sliding groove.

[0009] Further, the oil tank isolation valve in the application, the pressure plate is slidably arranged on the movable iron core, and the movable iron core is provided with a pressing surface corresponding to the upper end of the pressure plate. As a preferred scheme of the application, the pressing surface is used for axially driving the pressure plate to move.

[0010] Preferably, the oil tank isolation valve in the application, the driving part is fixedly arranged on the side of the limiting seat away from the plug; after the electromagnetic valve is powered on, the movable iron core axially drives the limiting seat to axially press and combine the transmission tooth with the driving tooth. As a preferred scheme of the application, based on the above structure, the driving part can be integrated into the valve body front end or the sliding seat bottom end of the electromagnetic valve, so that the manufacturing of the pressure plate is saved, and the production cost is saved.

[0011] Further, the oil tank isolation valve in the application, the limiting seat is in the form of a disc body and is arranged on the movable iron core, and a limiting convex is arranged on the movable iron core corresponding to the limiting seat and used for driving the limiting seat to move in the axial direction. As a preferred scheme of the application, the limiting seat manufactured in a split manner is beneficial to reduce the manufacturing difficulty.

[0012] Further, the oil tank isolation valve in the application is provided with a first installation groove on the limiting seat, the first installation groove extends radially from the center hole of the movable iron core to the outer edge of the limiting seat, the sliding seat is provided with a cavity for accommodating the rotation of the limiting seat, and the cavity is used for limiting the radial movement of the limiting seat. As a preferred scheme of the application, the limiting seat is conveniently installed from the side of the movable iron core.

[0013] Further, the oil tank isolation valve in the application is provided with at least one pair of inclined teeth on one side of the lock convex near the eaves, the adjacent inclined teeth are provided with a positioning clamping groove, and the lock convex is located in the positioning clamping groove in the second pressure relief state; in the one-way rotation direction of the limiting seat, the tooth surface of the inclined tooth near the first sliding groove is circumferentially inclined, and the tooth surface of the inclined tooth away from the first sliding groove is perpendicular to the circumferential direction. As a preferred scheme of the application, when the electromagnetic valve is de-energized, the movable iron core is moved towards the partition plate under the action of the first spring, and the inclined tooth and the positioning clamping groove are used for limiting the reverse rotation of the limiting seat in this process.

[0014] Further, the oil tank isolation valve in the application is provided with an installation groove on the eaves, the installation groove extends axially outwardly through the eaves, and the installation groove is adapted to the lock convex; in the one-way rotation direction of the limiting seat, the installation groove is arranged on the side of the eaves away from the first sliding groove. The installation groove is used for accommodating the lock convex into the sliding seat when the limiting seat is axially installed. The installation groove is arranged to facilitate the installation of the limiting seat into the sliding seat in the de-energized state of the electromagnetic valve. In the initial state, the lock convex is arranged in the installation groove, at this time, the limiting seat and the sliding seat are axially unlocked, and the oil tank isolation valve is in the pressure maintaining state. When the electromagnetic valve is energized, the limiting seat is pushed to move the lock convex axially inwardly out of the installation groove, and due to the action of the conversion device, after the lock convex moves out of the installation groove, the limiting seat rotates circumferentially to make the lock convex deviate from the installation groove. When the electromagnetic valve is de-energized again, the lock convex cannot enter the installation groove, at this time, the isolation valve is in the second pressure relief state.

[0015] The above technical scheme can be seen that the application has the following beneficial effects: 1. The oil tank isolation valve provided by the application has the principle that: after the oil tank isolation valve is in the second pressure relief state, at least one cycle of energization and de-energization of the electromagnetic valve is continued to be performed, so that the lock convex rotates into the first sliding groove, at this time, the limiting seat and the sliding seat are axially unlocked. After the limiting seat and the sliding seat are axially unlocked, the temporary de-energization pressure relief device is disabled, the electromagnetic valve continues to perform energization and de-energization, and the oil tank isolation valve alternately stays in the first pressure relief state and the pressure maintaining state. Thus, the temporary de-energization pressure relief function is realized.

[0016] 2. The oil tank isolation valve provided by the application can automatically enter the second pressure relief state after completing the air tightness test in the pressure maintaining state only by controlling the energization and de-energization of the electromagnetic valve, and has the advantages of simple operation and high automation degree. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a schematic view of an oil tank isolation valve according to an embodiment of the present application; Fig. 2 is a sectional view of an oil tank isolation valve according to an embodiment of the present application; Fig. 3 is an enlarged view of the area A in Fig. 2; Fig. 4 is a sectional view of a temporary power-off pressure relief device according to an embodiment of the present application; Fig. 5 is an exploded view of the components of the temporary power-off pressure relief device according to an embodiment of the present application; Fig. 6 is an enlarged view of the sliding seat in Fig. 5; Fig. 7 is a schematic view of the structure of the sliding seat according to an embodiment of the present application; Fig. 8 is a schematic view of the structure of the pressure plate according to an embodiment of the present application; Fig. 9 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in the loading slot); Fig. 10 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in abutment with the positioning clamping groove); Fig. 11 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in the first sliding slot); Fig. 12 is a sectional view of an oil tank isolation valve according to an embodiment of the present application; Fig. 13 is an enlarged view of the area B in Fig. 12; Fig. 14 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in the loading slot); Fig. 15 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in abutment with the positioning clamping groove); Fig. 16 is a schematic view of the position between the limiting seat and the sliding seat according to an embodiment of the present application (the locking protrusion is in the first sliding slot); Fig. 17 is an exploded view of the components of the temporary power-off pressure relief device according to an embodiment of the present application from a first perspective; Fig. 18 is an exploded view of the components of the temporary power-off pressure relief device according to an embodiment of the present application from a second perspective.

[0018] In the drawings: 1 - isolation valve body; 10 - valve cavity; 101 - partition; 1011 - through hole; 1012 - pressure relief hole; 2 - electromagnetic valve; 21 - movable iron core; 210 - pressure relief flow channel; 211 - plug; 212 - compression surface; 213 - limiting protrusion; 22 - first spring; 3 - temporary power-off pressure relief device; 31 - limiting seat; 310 - first mounting slot; 311 - locking protrusion; 312 - transmission tooth; 32 - sliding seat; 320 - cavity; 321 - eave; 3210 - positioning clamping groove; 3211 - bevel tooth; 322 - first sliding slot; 3220 - side wall; 323 - second sliding slot; 324 - loading slot; 33 - pressure plate; 330 - second mounting slot; 331 - driving tooth; 332 - positioning protrusion; 341 - guide bevel; 35 - elastic member; 4 - pressure relief plug; 41 - second spring. DETAILED DESCRIPTION

[0019] Embodiment 1. In combination with Figs. 1-3 and 12-13, the present embodiment provides an oil tank isolation valve, comprising: an isolation valve body 1, a valve cavity 10 is arranged in the isolation valve body 1, a partition plate 101 is arranged in the valve cavity 10, and a through hole 1011 is arranged on the partition plate 101 to communicate flow channels on both sides of the partition plate 101; an electromagnetic valve 2 is arranged on the isolation valve body 1, the electromagnetic valve 2 comprises a movable iron core 21 extending into the valve cavity 10, a plug 211 is arranged at the front end of the movable iron core 21, the plug 211 is opposite to the partition plate 101, and a first spring 22 is arranged on the side of the movable iron core 21 away from the partition plate 101; a pressure maintaining state: the electromagnetic valve 2 is powered off, and the first spring 22 pushes the movable iron core 21 to block the through hole 1011 with the plug 211; a first pressure relief state: the electromagnetic valve 2 is powered on, and the movable iron core 21 is retracted in the direction away from the partition plate 101 to open the through hole 1011; in the present embodiment, a pressure relief flow channel 210 is arranged through the movable iron core 21, the pressure relief flow channel 210 extends out of the center of the plug 211, a pressure relief hole 1012 is arranged on the partition plate 101 corresponding to the pressure relief flow channel 210, and a pressure relief valve plug 4 is arranged on the side of the partition plate 101 away from the movable iron core 21, and the pressure relief valve plug 4 is elastically abutted on the side of the pressure relief hole 1012 away from the movable iron core 21 by a second spring 41. The through hole 1011 is arranged on the outside of the pressure relief hole 1012, and the front end of the plug 211 is annular and corresponds to the through hole 1011. On the automobile oil tank system, the flow channel on the side of the partition plate 101 in the valve cavity 10 corresponding to the movable iron core 21 is connected to the oil tank, and the flow channel on the side of the partition plate 101 in the valve cavity 10 corresponding to the pressure relief valve plug 4 is connected to the carbon canister.

[0020] Embodiment 2. In combination with Figs. 3-5, the present embodiment is based on Embodiment 1 and further comprises: a temporary power-off pressure relief device 3, the temporary power-off pressure relief device 3 comprises a limiting seat 31, a sliding seat 32 and a conversion device, the sliding seat 32 is arranged at the front end of the valve body of the electromagnetic valve 2, and the limiting seat 31 is arranged on the movable iron core 21; a second pressure relief state: the electromagnetic valve 2 is powered off, and the first spring 22 pushes the movable iron core 21 to abut against the limiting seat 31 and the sliding seat 32 in the axial direction to limit the plug 211 from blocking the through hole 1011, and correspondingly, as shown in Fig. 10, the limiting seat 31 and the sliding seat 32 are respectively provided with axially opposite locking convexes 311 and eaves 321; the conversion device is used to convert the axial driving force of the movable iron core 21 on the limiting seat 31 to drive the limiting seat 31 to rotate in one direction (the process of one-way rotation is shown in Figs. 10-11); as shown in Fig. 11, one side of the eaves 321 is provided with a first sliding groove 322 for accommodating the axial sliding of the locking convex 311; and the rotating blocking structure is used to limit the limiting seat 31 from continuing to rotate in the circumferential direction after the locking convex 311 rotates into the first sliding groove 322.

[0021] In this embodiment, corresponding to the rotation blocking structure, the first chute 322 is provided with a side wall 3220 for limiting the circumferential rotation of the limiting seat 31. Specifically, the side wall 3220 extends outwards in a direction away from the plug 211.

[0022] Based on the above structure, the principle of the oil tank isolation valve is that after the oil tank isolation valve is in the second pressure relief state, at least one cycle of power-on and power-off of the electromagnetic valve 2 is continued to be performed, so that the locking convexity 311 rotates into the first chute 322, and at this time the limiting seat 31 and the sliding seat 32 are axially unlocked. After the limiting seat 31 and the sliding seat 32 are axially unlocked, the temporary power-off pressure relief device 3 is disabled, the electromagnetic valve 2 continues to perform power-on and power-off, and the oil tank isolation valve alternately remains in the first pressure relief state and the pressure maintaining state. Thus, the temporary power-off pressure relief function is realized. Specifically, in this embodiment, after the oil tank isolation valve is in the second pressure relief state, one cycle of power-on and power-off of the electromagnetic valve 2 is performed, and the locking convexity 311 enters the first chute 322.

[0023] In combination with FIGS. 4 to 11, in this embodiment, the conversion device includes a circumferentially locked driving part, which is arranged on one side of the limiting seat 31 in the axial direction. The driving part is provided with a driving tooth 331 on the side close to the limiting seat 31. On the opposite side of the driving tooth 331, the limiting seat 31 is provided with a transmission tooth 312. A guide slope 341 is arranged between the driving tooth 331 and the transmission tooth 312. After the electromagnetic valve 2 is powered on, the movable iron core 21 axially presses the limiting seat 31 and the driving part, so that the driving tooth 331 axially presses and fits the transmission tooth 312. At this time, the guide slope 341 is used to push the transmission tooth 312 to rotate circumferentially. Through the wedge-shaped cooperation of the driving tooth 331 and the transmission tooth 312, the axial pressure output by the movable iron core 21 can be converted into a rotating driving force.

[0024] In this embodiment, the limiting seat 31 is in the form of a disc body and is sleeved on the movable iron core 21. Correspondingly, as shown in FIG. 3, the movable iron core 21 is provided with a limiting boss 213 for driving the limiting seat 31 to move axially. The limiting seat 31 manufactured in a split manner is beneficial to reducing the manufacturing difficulty.

[0025] In this embodiment, the limiting seat 31 is provided with a first mounting groove 310, which extends from the center hole of the limiting seat 31 corresponding to the movable iron core 21 to the outer edge of the limiting seat 31. The sliding seat 32 is provided with a cavity 320 for accommodating the rotation of the limiting seat 31, which is used to limit the radial movement of the limiting seat 31. This facilitates the lateral installation of the limiting seat 31 from the movable iron core 21.

[0026] In the embodiment, the driving part is a pressing disc 33, which is arranged on the movable iron core 21 and on the side of the limiting seat 31 close to the plug 211. The driving teeth 331 are arranged on the pressing disc 33. On the opposite side of the driving teeth 331, the limiting seat 31 is provided with transmission teeth 312. The limiting seat 31 is slidably sleeved on the movable iron core 21. The side of the limiting seat 31 away from the plug 211 is provided with a limiting support part. As shown in FIGS. 3 to 5, after the electromagnetic valve 2 is energized, the movable iron core 21 axially pushes the pressing disc 33 to axially press the transmission teeth 312 of the driving teeth 331, so as to push the transmission teeth 312 to rotate circumferentially. At this time, the limiting support part is used to support the limiting seat 31.

[0027] In the embodiment, the limiting support part is an elastic member 35, which has the effect of buffering and reducing noise. Specifically, the elastic member 35 is a compression spring, which can reduce the friction of the rotation of the limiting seat 31. In the embodiment, the transmission teeth 312 are arranged on the axial end surface of the locking convex 311. In the embodiment, the locking convex 311 is provided with five locking convexes, which are arranged in a circumferential interval. The driving teeth 331 are arranged in a circumferential interval.

[0028] In the embodiment, a circumferential locking structure is arranged between the pressing disc 33 and the sliding seat 32, which includes a positioning convex 332 extending on the outside of the pressing disc 33 and a second sliding groove 323 extending axially on the inside of the sliding seat 32. The positioning convex 332 is slidably arranged in the second sliding groove 323. Specifically, the number of the positioning convex 332 is four, which are arranged in a circumferential interval.

[0029] In other embodiments, the circumferential locking structure can also be arranged between the pressing disc 33 and the movable iron core 21. When the pressing disc 33 is fixed on the movable iron core 21, the circumferential locking structure can be arranged between the movable iron core 21 and the sliding cavity corresponding to the movable iron core 21 on the electromagnetic valve 2. In the embodiment, the pressing disc 33 is slidably sleeved on the movable iron core 21. The movable iron core 21 is provided with a pressing surface 212 corresponding to the upper end of the pressing disc 33. The pressing surface 212 is used to axially drive the pressing disc 33 to move.

[0030] Specifically, the pressing disc 33 is provided with a second mounting groove 330 corresponding to the first mounting groove 310. The cavity 320 is also used to limit the radial movement of the pressing disc 33.

[0031] In this embodiment, the convex eaves 321 near the lock convex 311 is provided with at least one pair of inclined teeth 3211, and the adjacent inclined teeth 3211 are provided with a positioning clamping groove 3210, and the lock convex 311 is in contact with the positioning clamping groove 3210 in the second pressure relief state; in the one-way rotation direction of the limiting seat 31, the tooth surface of the inclined tooth 3211 near the first sliding groove 322 is circumferentially inclined, and the tooth surface of the inclined tooth 3211 away from the first sliding groove 322 is perpendicular to the circumference. When the electromagnetic valve 2 is powered off, the movable iron core 21 is moved towards the partition plate 101 by the action force of the first spring 22, and the inclined tooth 3211 and the positioning clamping groove 3210 are used to limit the reverse rotation of the limiting seat 31 in this process. Specifically, the lock convex 311 is provided with an inclined surface (the inclined surface is a guide inclined surface 341 on the transmission tooth 312) corresponding to the inclined tooth surface of the inclined tooth 3211. In this embodiment, the inclined tooth surface of the inclined tooth 3211 near the first sliding groove 322 extends to the first sliding groove 322.

[0032] Because the isolation valve needs to test the pressure maintaining state for air tightness, and once it enters the second pressure relief state and then enters the pressure maintaining state, it cannot enter the second pressure relief state again, the traditional oil tank isolation valve with switching off pressure relief function disclosed in application No. 202410579011.3 makes the electromagnetic valve powered on to enter the first pressure relief state after completing the air tightness test, and then manually pushes the push rod part to limit the movable iron core before power off, so that the oil tank isolation valve enters the second pressure relief state, which has the characteristics of complicated operation. In view of this, in combination with FIG. 6, in this embodiment, the convex eaves 321 is provided with a loading groove 324, the loading groove 324 extends axially outwardly through the convex eaves 321, and the loading groove 324 is adapted to the lock convex 311; in the one-way rotation direction of the limiting seat 31, the loading groove 324 is arranged on the side of the convex eaves 321 away from the first sliding groove 322.

[0033] The loading groove 324 is used to accommodate the lock convex 311 into the sliding seat 32 when the limiting seat 31 is axially loaded. In this embodiment, the vertical tooth surface of the inclined tooth 3211 corresponds to the side wall of the loading groove 324.

[0034] The loading groove 324 is arranged to facilitate the loading of the limiting seat 31 into the sliding seat 32 in the de-energized state of the electromagnetic valve 2. As shown in FIG. 9, in the initial state, the locking convex 311 is arranged in the loading groove 324, at which time the limiting seat 31 and the sliding seat 32 are axially unlocked, and the oil tank isolation valve is in the pressure maintaining state. When the electromagnetic valve 2 is energized, the limiting seat 31 is pushed to axially move the locking convex 311 inward out of the loading groove 324. Due to the effect of the conversion device, after the locking convex 311 moves out of the loading groove 324, the limiting seat 31 rotates circumferentially to make the locking convex 311 misaligned with the loading groove 324. When the electromagnetic valve 2 is de-energized next time, as shown in FIG. 10, the locking convex 311 cannot enter the loading groove 324, at which time the isolation valve is in the second pressure relief state. Therefore, the oil tank isolation valve in this embodiment can automatically enter the second pressure relief state after completing the air tightness test in the pressure maintaining state by controlling the on-off of the electromagnetic valve 2, which has the advantages of simple operation and high automation.

[0035] In combination with FIGS. 12 to 18, on the basis of the embodiment 1, the embodiment 3 further comprises: a temporary de-energization pressure relief device 3, the temporary de-energization pressure relief device 3 comprising a limiting seat 31, a sliding seat 32 and a conversion device, the sliding seat 32 being arranged at the front end of the valve body of the electromagnetic valve 2, and the limiting seat 31 being arranged on the movable core 21; a second pressure relief state; the electromagnetic valve 2 is de-energized, and the first spring 22 pushes the movable core 21 to axially abut against the limiting seat 31 and the sliding seat 32 to limit the plug 211 from plugging the through hole 1011, and correspondingly, the limiting seat 31 and the sliding seat 32 are respectively provided with axially opposite locking convexes 311 and eaves 321; the conversion device is used to convert the axial driving force of the movable core 21 on the limiting seat 31 to drive the limiting seat 31 to rotate circumferentially in one direction (the process of one-way rotation is shown in FIGS. 15 to 16); one side of the eaves 321 is provided with a first sliding groove 322 for receiving the axial sliding of the locking convex 311; and further comprising a rotation blocking structure, after the locking convex 311 rotates into the first sliding groove 322, the blocking structure is used to limit the limiting seat 31 from continuing to rotate circumferentially. In combination with FIGS. 16 and 17, in this embodiment, corresponding to the rotation blocking structure, the first sliding groove 322 is provided with a side wall 3220 for limiting the limiting seat 31 from continuing to rotate circumferentially. Specifically, the side wall 3220 extends out of the eaves 321 in the direction away from the plug 211.

[0036] The first sliding groove 322 is provided with a side wall 3220 for limiting the limiting seat 31 from continuing to rotate circumferentially. Specifically, the side wall 3220 extends out of the eaves 321 in the direction away from the plug 211.

[0037] Specifically, in this embodiment, after the oil tank isolation valve is in the second pressure relief state, and a cycle of energization and de-energization of the electromagnetic valve 2 is performed, the locking convex 311 enters the first sliding groove 322.

[0038] In the embodiment, the conversion device includes a circumferentially locked driving portion, which is arranged on the one axial side of the limiting seat 31. The driving portion is provided with a driving tooth 331 on the side close to the limiting seat 31. On the opposite side of the driving tooth 331, the limiting seat 31 is provided with a transmission tooth 312. A guide slope 341 is arranged between the driving tooth 331 and the transmission tooth 312. After the solenoid valve 2 is energized, the movable iron core 21 axially extrudes the limiting seat 31 and the driving portion, and the driving tooth 331 axially extrudes the transmission tooth 312. At this time, the guide slope 341 is used to push the transmission tooth 312 to rotate circumferentially. Through the wedge-shaped matching of the driving tooth 331 and the transmission tooth 312, the axial pressure output by the movable iron core 21 can be converted into a rotating driving force.

[0039] In the embodiment, the transmission tooth 312 and the locking convex 311 are circumferentially spaced apart. Based on this structure, in other embodiments, the same blocking wall as the side wall 3220 can be arranged on the transmission tooth 312 as a rotating blocking structure.

[0040] In the embodiment, the limiting seat 31 is in the form of a disc body and is sleeved on the movable iron core 21. Correspondingly, as shown in FIG. 13, the movable iron core 21 is provided with a limiting boss 213 corresponding to the limiting seat 31, which is used to limit the axial movement of the limiting seat 31. The limiting seat 31 manufactured in a split manner is conducive to reducing the manufacturing difficulty. In other embodiments, the limiting seat 31 can be fixed on the movable iron core 21, and the movable iron core 21 is arranged to rotate in the solenoid valve 2.

[0041] In the embodiment, the limiting seat 31 is provided with a first mounting groove 310, which extends from the center hole of the limiting seat 31 corresponding to the movable iron core 21 to the outer edge of the limiting seat 31. The sliding seat 32 is provided with a cavity 320 for accommodating the rotation of the limiting seat 31. The cavity 320 is used to limit the radial movement of the limiting seat 31.

[0042] In combination with FIGS. 13 to 18, in the embodiment, the driving portion is fixedly arranged on the side of the limiting seat 31 away from the plug 211. After the solenoid valve 2 is energized, the movable iron core 21 axially pushes the limiting seat 31 to axially extrude the driving tooth 331 of the transmission tooth 312, so as to push the transmission tooth 312 to rotate circumferentially. Based on the above structure, the driving portion can be integrated on the front end of the valve body of the solenoid valve 2 or the bottom end of the sliding seat 32. Compared with the embodiment 2, the manufacturing of the pressure plate 33 is saved, and the production cost is saved. In the embodiment, the driving portion is integrally arranged on the bottom of the sliding seat 32. In the embodiment, the locking convex 311 is provided with a pair of transmission teeth 312.

[0043] In the embodiment, the convex eaves 321 are provided with at least one pair of inclined teeth 3211 near the locking convex 311, and a positioning clamping groove 3210 is arranged between the adjacent inclined teeth 3211. When in the second pressure relief state, the locking convex 311 is in abutment with the positioning clamping groove 3210. In the one-way rotation direction of the limiting seat 31, the tooth surface of the inclined tooth 3211 near the first sliding groove 322 is circumferentially inclined, and the tooth surface of the inclined tooth 3211 away from the first sliding groove 322 is perpendicular to the circumference. When the electromagnetic valve 2 is powered off, the movable iron core 21 is moved towards the partition plate 101 under the action of the first spring 22, and the inclined tooth 3211 and the positioning clamping groove 3210 are used to limit the reverse rotation of the limiting seat 31 in this process. Specifically, the locking convex 311 is provided with an inclined surface corresponding to the inclined tooth surface of the inclined tooth 3211. In the embodiment, the inclined tooth surface of the inclined tooth 3211 near the first sliding groove 322 extends to the first sliding groove 322.

[0044] In the embodiment, the convex eaves 321 are provided with an installation groove 324 extending through the convex eaves 321 axially and outwardly, and the installation groove 324 is adapted to the locking convex 311. In the one-way rotation direction of the limiting seat 31, the installation groove 324 is arranged on the side of the convex eaves 321 away from the first sliding groove 322. The installation groove 324 is used to accommodate the locking convex 311 into the sliding seat 32 when the limiting seat 31 is axially installed. In the embodiment, the perpendicular tooth surface of the inclined tooth 3211 corresponds to the side wall of the installation groove 324.

[0045] The installation groove 324 is arranged to facilitate the installation of the limiting seat 31 into the sliding seat 32 when the electromagnetic valve 2 is powered off. As shown in FIG. 14, in the initial state, the locking convex 311 is arranged in the installation groove 324, and at this time, the limiting seat 31 and the sliding seat 32 are axially unlocked, and the oil tank isolation valve is in the pressure maintaining state. When the electromagnetic valve 2 is powered on, the limiting seat 31 is pushed to move the locking convex 311 axially inwardly out of the installation groove 324. Due to the action of the conversion device, after the locking convex 311 moves out of the installation groove 324, the limiting seat 31 rotates circumferentially to make the locking convex 311 deviate from the installation groove 324. When the electromagnetic valve 2 is powered off again, as shown in FIG. 15, the locking convex 311 cannot enter the installation groove 324, and at this time, the isolation valve is in the second pressure relief state. Therefore, the oil tank isolation valve in the embodiment can automatically enter the second pressure relief state after completing the air tightness test in the pressure maintaining state only by controlling the power on / off of the electromagnetic valve 2, and has the advantages of simple operation and high automation.

[0046] The technical principles of the present application are described above in combination with specific embodiments, and these descriptions are only for explaining the principles of the present application, and cannot be explained as limitations on the protection scope of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present application without creative labor, and these embodiments will fall within the protection scope of the present application.

Claims

1. An oil tank isolation valve, comprising: an isolation valve body (1) provided with a valve cavity (10) therein, the valve cavity (10) is provided with a partition plate (101) therein, the partition plate (101) is provided with a through hole (1011) connecting flow passages on both sides of the partition plate (101); a solenoid valve (2) mounted on the isolation valve body (1), the solenoid valve (2) comprises a movable iron core (21) extending into the valve cavity (10), the movable iron core (21) is provided with a plug (211) at the front end, the plug (211) is opposite to the partition plate (101), the movable iron core (21) is abutted by a first spring (22) on the side away from the partition plate (101); a pressure maintaining state: the solenoid valve (2) is de-energized, the first spring (22) pushes the movable iron core (21) to block the through hole (1011) with the plug (211); a first pressure relief state: the solenoid valve (2) is energized, the movable iron core (21) is retracted away from the partition plate (101) to open the through hole (1011); characterized in that further comprising: a temporary de-energization pressure relief device (3), the temporary de-energization pressure relief device (3) comprises a limiting seat (31), a sliding seat (32) and a conversion device, the sliding seat (32) is arranged at the front end of the valve body of the solenoid valve (2), the limiting seat (31) is arranged on the movable iron core (21); a second pressure relief state: the solenoid valve (2) is de-energized, the first spring (22) pushes the movable iron core (21) to abut the limiting seat (31) and the sliding seat (32) axially to limit the plug (211) from blocking the through hole (1011), correspondingly, the limiting seat (31) and the sliding seat (32) are respectively provided with axially opposite locking convexes (311) and convex eaves (321); the conversion device is used to convert the axial driving force of the movable iron core (21) on the limiting seat (31) to drive the limiting seat (31) to rotate circumferentially in one direction; one side of the convex eave (321) is provided with a first sliding groove (322) for accommodating the axial sliding of the locking convex (311); further comprising a rotation blocking structure, after the locking convex (311) rotates into the first sliding groove (322), the blocking structure is used to limit the limiting seat (31) from continuing to rotate circumferentially.

2. A tank isolation valve according to claim 1, characterised in that: the conversion device comprises a circumferentially locked driving part, the driving part is arranged on one side of the limiting seat (31) axially, the driving part is provided with a driving tooth (331) on the side close to the limiting seat (31), opposite to the driving tooth (331), the limiting seat (31) is provided with a transmission tooth (312), a guide inclined surface (341) is arranged between the driving tooth (331) and the transmission tooth (312); after the solenoid valve (2) is energized, the movable iron core (21) axially presses the limiting seat (31) and the driving part, until the driving tooth (331) axially presses the transmission tooth (312), at this time, the guide inclined surface (341) is used to push the transmission tooth (312) to rotate circumferentially.

3. A tank isolation valve according to claim 2, wherein: The driving part is a pressing disc (33) arranged on the movable iron core (21) on the side of the limiting seat (31) close to the plug (211), and the driving teeth (331) are arranged on the pressing disc (33). The limiting seat (31) is provided with driving teeth (312) opposite to the driving teeth (331), and the limiting seat (31) is slidably arranged on the movable iron core (21). The side of the limiting seat (31) away from the plug (211) is provided with a limiting support part. After the electromagnetic valve (2) is energized, the movable iron core (21) axially pushes the pressing disc (33) to axially press the driving teeth (331) and the driving teeth (312), so as to push the driving teeth (312) to rotate circumferentially. At this time, the limiting support part is used to support the limiting seat (31).

4. A tank isolation valve according to claim 3, wherein: The circumferential locking structure is arranged between the pressing disc (33) and the sliding seat (32), and includes a positioning convex (332) extending on the outer side of the pressing disc (33) and a second sliding groove (323) arranged on the inner side of the sliding seat (32) and extending axially. The positioning convex (332) is slidably arranged in the second sliding groove (323).

5. A tank isolation valve according to claim 4, wherein: The pressing disc (33) is slidably arranged on the movable iron core (21), and the movable iron core (21) is provided with a pressing surface (212) corresponding to the upper end of the pressing disc (33).

6. A tank isolation valve according to claim 2, wherein: The driving part is fixedly arranged on the side of the limiting seat (31) away from the plug (211). After the electromagnetic valve (2) is energized, the movable iron core (21) axially pushes the limiting seat (31) to axially press the driving teeth (331) and the driving teeth (312), so as to push the driving teeth (312) to rotate circumferentially.

7. A tank isolation valve according to claim 1, wherein: The limiting seat (31) is in the form of a disc body and is arranged on the movable iron core (21). Correspondingly, the movable iron core (21) is provided with a limiting convex (213) corresponding to the limiting seat (31) and arranged on the movable iron core (21) to drive the limiting seat (31) to move axially.

8. A tank isolation valve according to claim 7, characterised in that: The limiting seat (31) is provided with a first mounting groove (310) extending radially from the center hole of the limiting seat (31) to the outer edge of the limiting seat (31). The sliding seat (32) is provided with a cavity (320) for accommodating the rotation of the limiting seat (31). The cavity (320) is used to limit the radial movement of the limiting seat (31).

9. A tank isolation valve according to claim 1, wherein: The eaves (321) are provided with at least one pair of inclined teeth (3211) on the side close to the locking convex (311). Adjacent inclined teeth (3211) are provided with a positioning clamping groove (3210). In the second pressure relief state, the locking convex (311) is in contact with the positioning clamping groove (3210). In the one-way rotation direction of the limiting seat (31), the tooth surface of the inclined tooth (3211) close to the first sliding groove (322) is inclined circumferentially, and the tooth surface of the inclined tooth (3211) away from the first sliding groove (322) is perpendicular to the circumferential direction.

10. A tank isolation valve according to claim 1, characterized in that: The eaves (321) are provided with a loading groove (324) extending axially outward and penetrating the eaves (321). The loading groove (324) is adapted to the locking convex (311). In the one-way rotation direction of the limiting seat (31), the loading groove (324) is arranged on the side of the convex eaves (321) away from the first sliding groove (322).

11. A tank isolation valve according to claim 1, characterized in that: The rotation blocking structure is a side wall (3220) on the first sliding groove (322).