Outage pressure relief type oil tank isolating valve

Abstract

The utility model relates to the technical field of oil tank isolating valve manufacturing, in particular to a power-off pressure relief type oil tank isolating valve. Comprising a valve body, a valve cavity, a first flow channel and a second flow channel are arranged in the valve body, a limiting partition plate is arranged in the valve cavity, a through hole is formed in the limiting partition plate, the first flow channel and the second flow channel are communicated with the valve cavity, and the first flow channel and the second flow channel are arranged on the two sides of the limiting partition plate respectively; the electromagnetic valve is arranged on one side of the valve cavity, a movable iron core power-off pressure relief switching device is arranged on the electromagnetic valve, the power-off pressure relief switching device comprises a clamping head and an elastic part, the clamping head is arranged on one side of the movable iron core, and the elastic part is used for pushing the clamping head in the direction away from the side face of the movable iron core; the movable iron core is provided with a limiting convex part extending outwards in the radial direction, and the limiting convex part is provided with a clamping groove matched with the clamping head. The pressure relief state can be achieved when the automobile is powered off and assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank isolation valve manufacturing, in particular to a power-off pressure relief type oil tank isolation valve. Background Art

[0002] For the oil and gas system, in order to cooperate with 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 not to exceed the preset value.

[0003] In the fuel system of motor vehicles, the isolation valve can maintain the pressure in the tank when it is normally closed. At the same time, when the pressure in the tank exceeds the preset value, the isolation valve can automatically release the pressure through the valve inside the isolation valve to prevent fuel splashing or other valve blockages. At the same time, when negative pressure appears in the tank and exceeds the preset value, the isolation valve can automatically replenish the tank with air through the valve inside the isolation valve when it is normally closed.

[0004] When refueling is required, before opening the fuel cap, the fuel system needs to be depressurized to prevent fuel splashing. The fuel tank isolation valve is energized, and the solenoid valve pulls the push rod through electromagnetic force to open the sealing surface to form an air passage from the fuel tank to the outside, so that the fuel tank can be quickly depressurized when necessary and the maximum flow rate can be kept less than the preset value.

[0005] In the production process of motor vehicles, after the fuel tank and fuel tank isolation valve are assembled on the general assembly line and before the whole vehicle is powered on, the fuel tank will be pre-filled with oil in preparation for subsequent testing and starting. However, at this time, since it is not powered on, the existing fuel tank isolation valve is in a power-off normally closed state, resulting in the fuel tank being unable to be vented to the atmosphere. During the refueling process, the air in the tank cannot be discharged quickly, which affects the refueling efficiency and further affects the assembly efficiency of the motor vehicle. Utility Model Content

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a power-off pressure relief type fuel tank isolation valve, which can enter a pressure relief state when the power of the automobile is cut off for assembly.

[0007] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A power-off pressure relief type oil tank isolation valve, comprising:

[0009] A valve body, wherein a valve cavity, a first flow channel and a second flow channel are provided in the valve body, a limit baffle is provided in the valve cavity, a through hole is provided on the limit baffle, the first flow channel and the second flow channel are connected to the valve cavity, and the first flow channel and the second flow channel are respectively arranged on both sides of the limit baffle;

[0010] A solenoid valve, the solenoid valve is arranged on one side of the valve cavity, the solenoid valve is provided with a movable iron core, and an elastic member is provided on the movable iron core;

[0011] Pressure-maintaining state: the solenoid valve is powered off, and the elastic member is used to push the movable iron core toward the limit partition plate to press the movable iron core onto the limit partition plate to block the through hole on the limit partition plate;

[0012] First pressure relief state: the solenoid valve is energized, and the movable iron core is retracted to a preset position away from the limit partition by the electromagnetic force, so that the first flow channel and the second flow channel are connected;

[0013] Also includes:

[0014] A power-off pressure relief switching device, the power-off pressure relief switching device comprises a clamp and an elastic part, the clamp is arranged on one side of the movable iron core, the elastic part is used to push the clamp in a direction away from the side of the movable iron core; the movable iron core is provided with a radially outwardly extending limiting protrusion, the limiting protrusion is provided with a clamping groove adapted to the clamp, and when in the first pressure relief state, the clamp is at the front side of the limiting protrusion corresponding to the ejection direction of the movable iron core;

[0015] Second pressure relief state: the solenoid valve is powered off, the elastic member presses the limiting protrusion onto the clamping head, the clamping head enters the clamping groove, the clamping head is used to prevent the movable iron core from axially moving to fit with the limiting partition, and the clamping groove is used to prevent the elastic part from pushing the clamping head out of the limiting protrusion;

[0016] During the process of switching from the second pressure relief state to the first pressure relief state, the elastic portion is used to push the clamp head out of the outer side of the limiting protrusion.

[0017] Based on the above structure, the principle of the power-off pressure relief type oil tank isolation valve is as follows: the first flow channel is connected to the automobile oil tank, the pressure holding state and the first pressure relief state are two normal working states of the power-off pressure relief type oil tank isolation valve connected to the oil tank after the automobile is assembled, and the second pressure relief state is only used for the working condition of assembling the automobile in the power-off state. In the second pressure relief state, since the movable iron core is not in contact with the limit partition, the through hole on the limit partition connects the first flow channel and the second flow channel, and at this time, when refueling the oil tank, the air in the oil tank can be discharged from the first flow channel to the second flow channel.

[0018] The method of using the invention is as follows: before the power-off pressure relief type oil tank isolation valve is installed, the solenoid valve is powered on, and the clamp is on the front side of the limit convex portion corresponding to the ejection direction of the movable iron core. At this time, the clamp is pressed toward the side wall of the movable iron core to enter the projection position of the slot. At this time, the solenoid valve is powered off, and the movable iron core is ejected to the clamp through the elastic member and enters the slot. At this time, the power-off pressure relief type oil tank isolation valve is in the second pressure relief state, and is used for automobile assembly before power-on. When the oil tank is refueled during the assembly process, the air in the oil tank can be discharged from the first flow channel to the second flow channel, thereby improving the refueling efficiency and further improving the automobile assembly efficiency. After the automobile is assembled, when the power is first turned on, the solenoid valve is powered on, and the power-off pressure relief type oil tank isolation valve is in the first pressure relief state. At this time, since the clamp is out of the slot, the elastic part can push the clamp to the outside of the limit convex portion. When the power is cut off again in the future, due to the effect of the elastic part, the clamping head is always on the outside of the limiting protrusion, so the power-off pressure relief type tank isolation valve is in the pressure maintaining state. When the solenoid valve is powered on or off in the future, the power-off pressure relief type tank isolation valve can only switch between the first pressure relief state and the pressure maintaining state, and will no longer enter the second pressure relief state. Therefore, the power-off pressure relief type tank isolation valve can enter the second pressure relief state only when the car is powered off and assembled. After the car is assembled, it can only switch between the first pressure relief state and the pressure maintaining state, which does not affect its normal use after the car is assembled.

[0019] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the limiting protrusion is a cylindrical boss provided on the movable iron core; the clamping groove is an annular shape concentric with the limiting protrusion. As a preferred solution of the present application, the movable iron core rotates circumferentially without affecting the ability of the clamping head to enter the clamping groove when switching from the first pressure relief state to the second pressure relief state.

[0020] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the elastic part is a torsion spring, the elastic part includes a torsion spring body, and the torsion spring body is provided with a torsion output foot and a support foot extending from both ends, the clamping head is arranged on the torsion output foot, and the support foot is fixedly arranged;

[0021] It also includes a fixed limit shaft, and the torsion spring body is sleeved on the limit shaft. As a preferred embodiment of the present application, the limit shaft is used to limit the elastic part as a whole, and the support foot is fixedly arranged to prevent the elastic part from rotating as a whole on the limit shaft. In the process of switching the power-off pressure relief type oil tank isolation valve from the first pressure relief state to the second pressure relief state, when the clamp head is pressed toward the side of the movable iron core, the elastic force on the torque output foot needs to be overcome. When the power-off pressure relief type oil tank isolation valve is in the second pressure relief state, the torque output foot always applies an outward elastic force to the clamp head, and due to the limitation of the side wall of the card slot, the clamp head cannot move outward to the outside of the limiting protrusion. When the power-off pressure relief type oil tank isolation valve is switched from the second pressure relief state to the first pressure relief state, the torque output foot can push the clamp head out of the outside of the limiting protrusion.

[0022] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the limit shaft is arranged on the solenoid valve, and the support foot is fixed on the solenoid valve. As a preferred solution of the present application, the power-off pressure relief switching device is integrated on the solenoid valve. When assembling the power-off pressure relief type oil tank isolation valve, the power-off pressure relief switching device is first installed on the solenoid valve, and then the solenoid valve is connected to the valve body, which has the advantage of easy installation.

[0023] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the limit shaft is installed at the end of the solenoid valve, the limit shaft is provided with a limit head at the end away from the solenoid valve, and the torsion spring body is arranged between the limit head and the end face of the solenoid valve. As a preferred embodiment of the present application, the limit head and the end face of the solenoid valve can prevent the elastic part from moving axially.

[0024] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, a limit column is fixedly provided on one side of the solenoid valve adjacent to the limit axis, and a limit ring is provided on the support foot, and the limit ring is sleeved on the limit column. As a preferred solution of the present application, the limit ring is integrally provided with the support foot, and the limit ring is formed by shaping the front end of the support foot.

[0025] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the clamp head is arranged at the front end of the torque output foot, and the clamp head is formed by shaping the front end of the torque output foot. As a preferred solution of the present application, it has the advantages of simple structure and low manufacturing cost. A lever portion is extended from the front end of the clamp head, and in the process of switching from the first pressure relief state to the second pressure relief state, the lever portion is used to apply a force to push the clamp head. As a preferred solution of the present application, the lever portion is formed by extending and shaping the front end of the clamp head.

[0026] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, the lever portion is arranged at the inner port position of the first flow channel. As a preferred solution of the present application, when manufacturing the power-off pressure relief type oil tank isolation valve, it is necessary to conduct an air tightness test on it, so it is necessary to switch the power-off pressure relief type oil tank isolation valve to a pressure holding state, so the power-off pressure relief type oil tank isolation valve must be switched from the first pressure relief state to the second pressure relief state, and the limiting protrusion cannot be pressed onto the clamping head before assembling the solenoid valve. Therefore, when the power-off pressure relief type oil tank isolation valve is in the first pressure relief state, it is necessary to extend it into the valve cavity to push the clamping head. Based on the above structure, a rod can be used to extend from the outer end of the first flow channel into its inner port to push the lever portion so that the clamping head enters the axial position of the projection of the card groove.

[0027] Furthermore, in the power-off pressure relief type oil tank isolation valve described in the present application, a spring groove is provided on the end of the movable iron core away from the limiting partition, the elastic member is a compression spring, the elastic member is arranged in the spring groove, a sliding cavity is provided on the solenoid valve, the movable iron core is slidably arranged in the sliding cavity, and the end of the elastic member away from the movable iron core abuts against the bottom of the sliding cavity.

[0028] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0029] 1. The utility model provides a power-off pressure relief type fuel tank isolation valve, which can enter the second pressure relief state only when the power of the automobile is cut off for assembly. After the automobile is assembled, it can only switch between the first pressure relief state and the pressure maintaining state, which does not affect its normal use after the automobile is assembled.

[0030] 2. The utility model provides a power-off pressure relief type oil tank isolation valve, wherein the power-off pressure relief switching device is a torsion spring as a whole, which has the advantages of simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of a power-off pressure relief type oil tank isolation valve in a pressure maintaining state according to an embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of a power-off pressure relief type oil tank isolation valve in a second pressure relief state according to an embodiment of the present application;

[0033] Figure 3 It is a schematic diagram of a power-off pressure relief type oil tank isolation valve in a first pressure relief state according to an embodiment of the present application;

[0034] Figure 4 for Figure 1 A partial enlarged view of the area A in the middle circle;

[0035] Figure 5 for Figure 2 A partial enlarged view of the area B in the middle circle;

[0036] Figure 6 for Figure 3 A partial enlarged view of the area C in the middle circle;

[0037] Figure 7 It is a schematic diagram of the solenoid valve when the power-off pressure relief type oil tank isolation valve according to an embodiment of the present application is in a first pressure relief state;

[0038] Figure 8 for Figure 7 A partial enlarged view of the area D in the middle circle;

[0039] Fig. 9 It is a schematic diagram of the solenoid valve when the power-off pressure relief type oil tank isolation valve according to an embodiment of the present application is in the second pressure relief state;

[0040] Fig.10 for Fig. 9 A partial enlarged view of the area E in the middle circle;

[0041] Fig.11 This is a schematic diagram of the power-off pressure relief switching device described in an embodiment of the present application.

[0042] In the figure: 1-valve body; 10-valve cavity; 101-limiting partition; 1011-first through hole; 1012-second through hole 11-first flow channel; 12-second flow channel; 13-pressure-maintaining valve plug;

[0043] 2- electromagnetic valve; 21- movable iron core; 211- limiting convex part; 212- card slot; 213- sealing head; 214- spring slot; 215- first pressure relief hole; 216- second pressure relief hole; 22- elastic member; 23- sliding cavity;

[0044] 3-power-off pressure relief switching device; 31-clamp; 311-lever portion; 32-elastic portion; 321-torsion spring body; 322-torque output foot; 323-support foot; 3231-limiting ring; 33-limiting shaft; 331-limiting head; 34-limiting column. DETAILED DESCRIPTION Example

[0045] A power-off pressure relief type oil tank isolation valve, combined with Figure 1 , 3 , 4 and 6, including:

[0046] A valve body 1, wherein a valve cavity 10, a first flow channel 11 and a second flow channel 12 are provided in the valve body 1, a limiting baffle 101 is provided in the valve cavity 10, a through hole is provided on the limiting baffle 101, the first flow channel 11 and the second flow channel 12 are connected to the valve cavity 10, and the first flow channel 11 and the second flow channel 12 are respectively arranged on both sides of the limiting baffle 101;

[0047] A solenoid valve 2, wherein the solenoid valve 2 is arranged at one side of the valve chamber 10, and a movable iron core 21 is arranged on the solenoid valve 2, and an elastic member 22 is arranged on the movable iron core 21;

[0048] like Figure 4 In the pressure-maintaining state shown: the solenoid valve 2 is powered off, and the elastic member 22 is used to push the movable iron core 21 toward the limiting partition 101 to press the movable iron core 21 onto the limiting partition 101 to block the through hole on the limiting partition 101; specifically, a sealing head 213 is provided at the front end of the movable iron core 21.

[0049] like Figures 6 to 8 In the first pressure relief state shown, the solenoid valve 2 is energized, and the movable iron core 21 is retracted to a preset position away from the limiting partition 101 by the electromagnetic force, so that the first flow channel 11 and the second flow channel 12 are connected;

[0050] Also includes:

[0051] Combination Figure 4 and Figure 6 The power-off pressure relief switching device 3 shown in the figure comprises a clamp head 31 and an elastic part 32, wherein the clamp head 31 is arranged on one side of the movable iron core 21, and the elastic part 32 is used to push the clamp head 31 in a direction away from the side of the movable iron core 21; the movable iron core 21 is provided with a radially outwardly extending limiting protrusion 211, and the limiting protrusion 211 is provided with a clamping groove 212 adapted to the clamp head 31, and when in the first pressure relief state, the clamp head 31 is at the front side of the limiting protrusion 211 corresponding to the ejection direction of the movable iron core 21;

[0052] Combination Figure 2 , 5 , 9 and 10, the second pressure relief state: the solenoid valve 2 is powered off, the elastic member 22 presses the limiting protrusion 211 onto the clamping head 31, the clamping head 31 enters the clamping groove 212, the clamping head 31 is used to prevent the movable iron core 21 from axially moving to fit with the limiting partition 101, and the clamping groove 212 is used to prevent the elastic part 32 from pushing the clamping head 31 out of the limiting protrusion 211;

[0053] During the process of switching from the second pressure relief state to the first pressure relief state, the elastic portion 32 is used to push the clamping head 31 out of the outer side of the limiting protrusion 211 .

[0054] Based on the above structure, the principle of the power-off pressure relief type oil tank isolation valve is as follows: the first flow channel 11 is connected to the automobile oil tank, the pressure holding state and the first pressure relief state are two normal working states of the power-off pressure relief type oil tank isolation valve connected to the oil tank after the automobile is assembled, and the second pressure relief state is only used for the working condition of assembling the automobile in the power-off state. In the second pressure relief state, since the movable iron core 21 is not in contact with the limiting partition 101, the through hole on the limiting partition 101 is connected to the first flow channel 11 and the second flow channel 12. At this time, when refueling the oil tank, the air in the oil tank can be discharged from the first flow channel 11 to the second flow channel 12.

[0055] The method of using the method is as follows: before the power-off pressure relief type oil tank isolation valve is installed, the solenoid valve 2 is powered on, and the clamp head 31 is on the front side of the limit convex portion 211 corresponding to the ejection direction of the movable iron core 21. At this time, the clamp head 31 is pressed toward the side wall of the movable iron core 21 to enter the projection position of the card slot 212. At this time, the solenoid valve 2 is powered off, and the movable iron core 21 is ejected through the elastic member 22 to the clamp head 31 to enter the card slot 212. At this time, the power-off pressure relief type oil tank isolation valve is in the second pressure relief state, which is used for automobile assembly before power-on. When refueling the oil tank during the assembly process, the air in the oil tank can be discharged from the first flow channel 11 to the second flow channel 12, thereby improving the refueling efficiency and further improving the automobile assembly efficiency. It should be noted that after the power-off pressure relief type oil tank isolation valve is produced, it can be switched to the second pressure relief state, so that it can be directly applied to the automobile assembly production line.

[0056] After the automobile is assembled, when the power is turned on for the first time, the solenoid valve 2 is powered on, and the power-off pressure relief type oil tank isolation valve is in the first pressure relief state. At this time, since the clamp head 31 is out of the clamping groove 212, the elastic part 32 can push the clamp head 31 to the outside of the limiting protrusion 211. When the power is turned off again in the future, due to the effect of the elastic part 32, the clamp head 31 is always on the outside of the limiting protrusion 211, so the power-off pressure relief type oil tank isolation valve is in the pressure holding state. When the solenoid valve 2 is powered on or off in the future, the power-off pressure relief type oil tank isolation valve can only switch between the first pressure relief state and the pressure holding state, and will not enter the second pressure relief state. Therefore, the power-off pressure relief type oil tank isolation valve can enter the second pressure relief state only when the automobile is powered off and assembled. After the automobile is assembled, it can only switch between the first pressure relief state and the pressure holding state, which does not affect its normal use after the automobile is assembled.

[0057] Combination Figure 7 and 9As shown, in this embodiment, the limiting protrusion 211 is a cylindrical boss provided on the movable iron core 21; the clamping groove 212 is an annular shape concentric with the limiting protrusion 211. The movable iron core 21 rotates circumferentially without affecting the ability of the clamping head 31 to enter the clamping groove 212 when switching from the first pressure relief state to the second pressure relief state.

[0058] In this embodiment, the Figures 9 to 11 As shown, the elastic part 32 is a torsion spring, and the elastic part 32 includes a torsion spring body 321, and the torsion spring body 321 is provided with a torsion output foot 322 and a support foot 323 at both ends, and the clamp head 31 is arranged on the torsion output foot 322, and the support foot 323 is fixedly arranged; it also includes a fixedly arranged limiting shaft 33, and the torsion spring body 321 is sleeved on the limiting shaft 33. The limiting shaft 33 is used to limit the elastic part 32 as a whole, and the support foot 323 is fixedly arranged to prevent the elastic part 32 from rotating as a whole on the limiting shaft 33. In the process of switching the power-off pressure relief type oil tank isolation valve from the first pressure relief state to the second pressure relief state, when the clamp head 31 is pressed toward the side of the movable iron core 21, the elastic force on the torque output foot 322 needs to be overcome. When the power-off pressure relief type oil tank isolation valve is in the second pressure relief state, the torque output pin 322 always applies an outward elastic force to the clamp head 31. Due to the limitation of the side wall of the clamping groove 212, the clamp head 31 cannot move outward to the outside of the limiting protrusion 211. When the power-off pressure relief type oil tank isolation valve is switched from the second pressure relief state to the first pressure relief state, the torque output pin 322 can push the clamp head 31 out of the outside of the limiting protrusion 211.

[0059] In this embodiment, the limit shaft 33 is arranged on the solenoid valve 2, and the support foot 323 is fixed on the solenoid valve 2. The power-off pressure relief switching device 3 is integrated on the solenoid valve 2. When assembling the power-off pressure relief type oil tank isolation valve, the power-off pressure relief switching device 3 is first installed on the solenoid valve 2, and then the solenoid valve 2 is connected to the valve body 1, which has the advantage of easy installation.

[0060] In this embodiment, the limit shaft 33 is installed at the end of the solenoid valve 2, and a limit head 331 is provided at the end of the limit shaft 33 away from the solenoid valve 2, and the torsion spring body 321 is arranged between the limit head 331 and the end face of the solenoid valve 2. The limit head 331 and the end face of the solenoid valve 2 can prevent the elastic part 32 from moving axially. Specifically, the limit shaft 33 is a screw installed on the solenoid valve 2, and the limit head 331 is a screw head.

[0061] In this embodiment, a limiting column 34 is fixedly provided on one side of the solenoid valve 2 adjacent to the limiting shaft 33, and a limiting ring 3231 is provided on the supporting foot 323, and the limiting ring 3231 is sleeved on the limiting column 34. The limiting ring 3231 and the supporting foot 323 are integrally provided, and the limiting ring 3231 is formed by shaping the front end of the supporting foot 323.

[0062] In this embodiment, the clamp head 31 is arranged at the front end of the torque output pin 322, and the clamp head 31 is formed by shaping the front end of the torque output pin 322. Specifically, the clamp head 31 is U-shaped, which has the advantages of simple structure and low manufacturing cost.

[0063] In this embodiment, a lever portion 311 is extended from the front end of the clamp head 31. In the process of switching from the first pressure relief state to the second pressure relief state, the lever portion 311 is used to apply a force to push the clamp head 31. The lever portion 311 is formed by extending and shaping the front end of the clamp head 31.

[0064] Combination Figure 5 As shown, in this embodiment, the lever portion 311 is arranged at the inner port position of the first flow channel 11. When manufacturing the power-off pressure relief type oil tank isolation valve, it is necessary to perform an air tightness test on it, so the power-off pressure relief type oil tank isolation valve needs to be switched to a pressure-maintaining state. Therefore, the power-off pressure relief type oil tank isolation valve must be switched from the first pressure relief state to the second pressure relief state, and the limiting protrusion 211 cannot be pressed on the clamping head 31 before assembling the solenoid valve 2. Therefore, when the power-off pressure relief type oil tank isolation valve is in the first pressure relief state, it is necessary to extend into the valve cavity 10 to push the clamping head 31. Based on the above structure, a rod can be used to extend from the outer end of the first flow channel 11 into its inner port to push the lever portion 311, so that the clamping head 31 enters the projected axial position of the clamping groove 212. In this embodiment, the first flow channel 11 is arranged to extend horizontally, and the second flow channel 12 is arranged to extend longitudinally.

[0065] In this embodiment, a spring groove 214 is provided on the end of the movable iron core 21 away from the limiting partition 101, the elastic member 22 is a compression spring, the elastic member 22 is arranged in the spring groove 214, a sliding cavity 23 is provided on the solenoid valve 2, the movable iron core 21 is slidably arranged in the sliding cavity 23, and the end of the elastic member 22 away from the movable iron core 21 abuts against the bottom of the sliding cavity 23.

[0066] In this embodiment, a pressure-maintaining valve plug 13 is provided above the limit partition 101. The pressure-maintaining valve plug 13 is pressed on the limit partition 101 by a compression spring. The through hole on the limit partition 101 includes a first through hole 1011 and a second through hole 1012. The pressure-maintaining valve plug 13 is pressed on the limit partition 101 to block the second through hole 1012. When the limit partition 101 is in a pressure-maintaining state, the movable iron core 21 blocks the first through hole 1012. Specifically, the second through hole 1012 is at the center of the limit partition 101, and the first through hole 1011 is arranged radially outside the second through hole 1012. If the gas pressure in the oil tank is too high, the pressure-maintaining valve plug 13 can be opened to release the pressure. Correspondingly, a pressure relief channel is provided on the movable iron core 21 , and the pressure relief channel includes an axially extending first pressure relief hole 215 and a second pressure relief hole 216 extending radially outwardly inside the first pressure relief hole 215 . The first pressure relief hole 215 corresponds to the second through hole 1012 .

[0067] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanation here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A power-off pressure relief type oil tank isolation valve, comprising: A valve body (1), wherein a valve cavity (10), a first flow channel (11) and a second flow channel (12) are provided in the valve body (1), a limit baffle (101) is provided in the valve cavity (10), a through hole is provided on the limit baffle (101), the first flow channel (11) and the second flow channel (12) are communicated with the valve cavity (10), and the first flow channel (11) and the second flow channel (12) are respectively arranged on both sides of the limit baffle (101); A solenoid valve (2), the solenoid valve (2) being arranged on one side of the valve chamber (10), the solenoid valve (2) being provided with a movable iron core (21), and an elastic member (22) being provided in contact with the movable iron core (21); Pressure-maintaining state: the solenoid valve (2) is powered off, and the elastic member (22) presses the movable iron core (21) onto the limiting partition (101) to block the through hole on the limiting partition (101); First pressure relief state: the solenoid valve (2) is energized, and the movable iron core (21) is retracted to a preset position away from the limiting partition (101) by the electromagnetic force, so that the first flow channel (11) and the second flow channel (12) are connected; It is characterized by further comprising: A power-off pressure relief switching device (3), the power-off pressure relief switching device (3) comprising a clamp (31) and an elastic portion (32), the clamp (31) being arranged on one side of a movable iron core (21), the elastic portion (32) being used to push the clamp (31) in a direction away from the side of the movable iron core (21); the movable iron core (21) being provided with a radially outwardly extending limiting protrusion (211), the limiting protrusion (211) being provided with a clamping groove (212) adapted to the clamp (31), and when in a first pressure relief state, the clamp (31) is on the front side of the limiting protrusion (211) corresponding to the ejection direction of the movable iron core (21); Second pressure relief state: the solenoid valve (2) is powered off, the elastic member (22) presses the limiting protrusion (211) onto the clamping head (31), and the clamping head (31) enters the clamping groove (212); During the process of switching from the second pressure relief state to the first pressure relief state, the elastic portion (32) is used to push the clamping head (31) out of the outside of the limiting protrusion (211).

2. A power-off pressure relief type oil tank isolation valve according to claim 1, characterized in that: The limiting convex portion (211) is a cylindrical boss arranged on the movable iron core (21); and the clamping groove (212) is in the form of a ring that is concentric with the limiting convex portion (211).

3. The power-off pressure relief type oil tank isolation valve according to claim 1 is characterized in that: The elastic part (32) is a torsion spring, and the elastic part (32) comprises a torsion spring body (321). Torsion output feet (322) and support feet (323) are extended at both ends of the torsion spring body (321). The clamping head (31) is arranged on the torque output foot (322), and the support foot (323) is fixedly arranged. It also includes a fixedly arranged limiting shaft (33), and the torsion spring body (321) is sleeved on the limiting shaft (33).

4. The power-off pressure relief type oil tank isolation valve according to claim 3 is characterized in that: The limiting shaft (33) is arranged on the solenoid valve (2), and the supporting foot (323) is fixed on the solenoid valve (2).

5. The power-off pressure relief type oil tank isolation valve according to claim 4 is characterized in that: The limit shaft (33) is mounted on the end of the solenoid valve (2); a limit head (331) is provided at one end of the limit shaft (33) away from the solenoid valve (2); and the torsion spring body (321) is arranged between the limit head (331) and the end surface of the solenoid valve (2).

6. The power-off pressure relief type oil tank isolation valve according to claim 5, characterized in that: A limiting column (34) is fixedly provided on one side of the solenoid valve (2) adjacent to the limiting shaft (33), a limiting ring (3231) is provided on the supporting foot (323), and the limiting ring (3231) is sleeved on the limiting column (34).

7. The power-off pressure relief type oil tank isolation valve according to claim 3 is characterized in that: The clamping head (31) is arranged at the front end of the torque output pin (322), and the clamping head (31) is formed by shaping the front end of the torque output pin (322).

8. The power-off pressure relief type oil tank isolation valve according to claim 7, characterized in that: A lever portion (311) is extended from the front end of the clamping head (31), and during the process of switching from the first pressure relief state to the second pressure relief state, the lever portion (311) is used to apply a force to push the clamping head (31).

9. The power-off pressure relief type oil tank isolation valve according to claim 8, characterized in that: The lever portion (311) is arranged at an inner port position of the first flow channel (11).

10. The power-off pressure relief type oil tank isolation valve according to claim 1, characterized in that: A spring groove (214) is provided on the end of the movable iron core (21) away from the limiting partition (101); the elastic member (22) is a compression spring; the elastic member (22) is arranged in the spring groove (214); a sliding cavity (23) is provided on the solenoid valve (2); the movable iron core (21) is slidably arranged in the sliding cavity (23); and the end of the elastic member (22) away from the movable iron core (21) abuts against the bottom of the sliding cavity (23).

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