Oil tank isolating valve capable of keeping open

Abstract

The utility model discloses an oil tank isolating valve capable of keeping open in the field of automobile isolating valves, which comprises a valve casing internally provided with a cavity, the valve casing comprises a circular truncated cone dividing the cavity into an upper pipe cavity and a lower pipe cavity and an oil tank pipeline joint communicated with the upper pipe cavity, and the circular truncated cone is provided with a vent hole. An upper valve head assembly used for being close to or far away from the circular truncated cone to block or open the vent hole is correspondingly arranged in the upper pipe cavity, a lower valve head assembly used for being close to or far away from the circular truncated cone to block or open the vent hole is correspondingly arranged in the lower pipe cavity, and an electromagnetic valve assembly used for controlling the upper valve head assembly to be close to or far away from the circular truncated cone is correspondingly arranged at the top of the valve shell. The upper valve head assembly comprises an upper valve element and an upper spring, the upper spring provides elastic force to drive the upper valve element to get close to the circular truncated cone, a retainer capable of getting close to or getting away from the upper valve element is arranged on the valve shell, the retainer and the upper valve element form a clamping structure when getting close to the upper valve element so as to open the vent hole, and the retainer and the valve shell form a sealing structure when getting away from the upper valve element. The switch can be kept in an open state without being powered on.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile isolation valves, in particular to a fuel tank isolation valve that can be kept open. Background Art

[0002] The FTIV valve, or Fuel Tank Isolation Valve, is a critical component in the high-pressure fuel tank system. Its primary function is to remain closed when the engine is turned off, preventing gasoline vapors from entering the carbon canister and potentially spilling. Furthermore, the FTIV valve places higher pressure-resistant requirements on surrounding components of the high-pressure fuel tank, such as the fuel cap, fuel lines, and evaporative lines, to ensure the sealing and safety of the entire system.

[0003] In the prior art, a top-to-bottom oil tank isolation valve is disclosed, with its publication (publication) number: CN114909234A; application date: 2022-06-15; publication (publication) date: 2022-08-16, comprising: a valve housing, an internal cavity for gas circulation, the cavity being divided into an upper cavity and a lower cavity by an inner ring platform, the upper cavity and the lower cavity being connected through a vent hole in the middle of the inner ring platform, a tank pipeline connector connected to the upper cavity being provided on the valve housing; an electromagnetic coil assembly being provided at the upper end of the valve housing, a bottom cover being provided at the bottom of the valve housing, an upper valve head assembly for blocking or opening the vent hole; a lower valve head assembly for blocking or opening the vent hole A vent hole is opened, and a pressure relief air path is provided in the upper valve head assembly; an electromagnetic coil assembly is installed on the top of the valve housing to control the upper valve head assembly to move closer to or away from the inner ring platform, which solves the problem of the existing oil tank isolation valve causing the valve in the oil tank to be closed due to excessive flow during the initial pressure relief process. However, the problem is that when the client uses the isolation valve to perform online sealing tests on the oil tank assembly and refueling stages on the production line, the electrical control of the complete operation cannot be used at any time, and the isolation valve can only open the ventilation pipe when it is powered on. Therefore, additional control is required to open the tank isolation valve. This method is cumbersome and time-consuming, affecting the test efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a fuel tank isolation valve that can be kept open. When no electricity is required, the isolation valve can remain open, providing convenience for online sealing testing of the fuel tank assembly and refueling of the production line.

[0005] The object of the utility model is achieved as follows: a tank isolation valve that can be kept open, comprising a valve housing with a cavity therein, the valve housing comprising a frustum that divides the cavity into an upper tube cavity and a lower tube cavity, and a tank pipeline joint connected to the upper tube cavity, a vent hole being provided on the frustum, an upper valve head assembly corresponding to the upper tube cavity is provided for approaching or moving away from the frustum to seal or open the vent hole, a lower valve head assembly corresponding to the lower tube cavity is provided for approaching or moving away from the frustum to seal or open the vent hole, a solenoid valve assembly corresponding to the top of the valve housing is provided for controlling the upper valve head assembly to approach or move away from the frustum, the upper valve head assembly comprises an upper valve core and an upper spring, the upper spring provides elastic force to drive the upper valve core close to the frustum, a stopper that can approach or move away from the upper valve core is provided on the valve housing, the stopper forms a locking structure with the upper valve core when it approaches the upper valve core to open the vent hole, and forms a sealing structure with the valve housing when it moves away from the upper valve core.

[0006] When the utility model is supplied, the isolation valve is in an unpowered state. Under the elastic force of the upper spring, the stopper and the upper valve core form a stable engaging structure. At this time, the upper valve core is away from the frustum, and the vent is in an open state, so that sealing tests and production line refueling can be performed; when the isolation valve is in an energized state, the solenoid valve assembly controls the upper valve core to overcome the elastic force of the upper spring and move upward. Under the action of external force, the stopper can be away from the upper valve core and form a sealing structure with the valve housing, and the isolation valve can work normally. Compared with the prior art, the beneficial effect of the utility model is that the stable engaging structure formed by the stopper and the upper valve core can keep the isolation valve in the supply state open at all times, without the need to energize the box vent valve or cooperate with other external equipment. Sealing tests and production line refueling can be performed simply and quickly, which improves the user experience of the client.

[0007] As a further improvement of the present invention, the valve housing also includes an external boss and an external tube. The stopper is movably connected to the external boss. The external tube is provided with a driving member for driving the stopper away from the upper valve core, and a dust cap is provided at the outward end.

[0008] As a further improvement of the present invention, the stopper includes a metal sliding pin and a plurality of sealing rings, and the driving member includes a magnet block.

[0009] As a further improvement of the present invention, the metal sliding pin includes an adsorption portion, a connecting portion and a stopping portion, a plurality of the sealing rings are arranged at intervals on the connecting portion, and the cross-sectional shape of the stopping portion is consistent with the shape of the inner ring of the outer boss.

[0010] As a further improvement of the present invention, the upper valve core includes a movable column, a movable frame, a buckle and an outer ring protrusion, the buckle is arranged on the outside of the movable frame, the outer ring protrusion is arranged on the side of the movable frame away from the cone, and a pressure relief passage is opened on the movable frame.

[0011] As a further improvement of the present invention, the top of the upper valve core is connected to the solenoid valve assembly, and a sealing rubber pad is provided at the bottom. The upper end of the upper spring is sleeved on the solenoid valve assembly, and the lower end is sleeved on the upper valve core.

[0012] As a further improvement of the present invention, a valve seat is provided at the bottom of the valve housing, and the valve seat includes a carbon canister pipeline connector communicated with the lower tube cavity.

[0013] As a further improvement of the present invention, the lower valve head assembly includes a lower valve core and a lower spring. The top of the lower valve core is movably connected to the upper valve head through the vent hole. The upper end of the lower spring is sleeved on the lower valve core, and the lower end of the lower spring is arranged on the valve seat.

[0014] As a further improvement of the present invention, the solenoid valve assembly includes a coil skeleton, a coil is wound around the outside of the coil skeleton, a moving iron core is arranged inside, and an electromagnetic shell is arranged corresponding to the outside of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 It is a partial cross-sectional view of the utility model.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure when the upper valve core is engaged with the stopper.

[0018] Among them, 1 is a round table, 2 is a fuel tank pipeline connector, 3 is an external boss, 4 is an external tube, 5 is a vent, 6 is an upper valve core, 601 is a movable column, 602 is a movable frame, 603 is a buckle, 604 is an outer ring protrusion, 605 is a pressure relief passage, 7 is an upper spring, 8 is a metal sliding pin, 801 is an adsorption part, 802 is a connecting part, 803 is a stopper, 9 is a sealing ring, 10 is a magnet block, 11 is a dust cap, 12 is a valve seat, 13 is a carbon canister pipeline connector, 14 is a skeleton, 15 is a coil, 16 is a moving iron core, 17 is an electromagnetic shell, 18 is a sealing rubber pad, 19 is a lower valve core, and 20 is a lower spring. DETAILED DESCRIPTION

[0019] like Figure 1 and 2As shown, a tank isolation valve that can be kept open includes a valve housing with a cavity therein, the valve housing including a frustum 1 that divides the cavity into an upper tube cavity and a lower tube cavity, a tank pipe joint 2 connected to the upper tube cavity, an external boss 3 and an external tube 4; a vent 5 is provided on the frustum 1; an upper valve head assembly for approaching or moving away from the frustum 1 to block or open the vent 5 is provided in the corresponding upper tube cavity; a lower valve head assembly for approaching or moving away from the frustum 1 to block or open the vent 5 is provided in the corresponding lower tube cavity; a control valve for controlling the upper valve head assembly to approach or move away from the frustum 1 is provided on the top of the valve housing Solenoid valve assembly; the upper valve head assembly includes an upper valve core 6 and an upper spring 7, the upper spring 7 provides elastic force to drive the upper valve core 6 close to the round table 1; the outer boss 3 is provided with a stopper that can approach or move away from the upper valve core 6, and when the stopper approaches the upper valve core 6, it forms a snap-fit ​​structure with it to open the vent 5, and when it moves away from the upper valve core 6, it forms a sealing structure with the outer boss 3; the external tube 4 is provided with a driving member for driving the stopper away from the upper valve core 6, and a dust cap 11 is provided at the outward end; a valve seat 12 is provided at the bottom of the corresponding valve shell, and the valve seat 12 includes a carbon canister pipe connector 13 connected to the lower tube cavity.

[0020] In this embodiment, the upper valve core 6 includes a hollow movable column 601, a movable frame 602, a buckle 603 and an outer ring protrusion 604. The buckle 603 is arranged on the outside of the movable frame 602, and the outer ring protrusion 604 is arranged on the side of the movable frame 602 away from the frustum 1. A pressure relief passage 605 is opened on the movable frame 602; the solenoid valve assembly includes a coil skeleton 14, a coil 15 is wound around the outside of the coil skeleton 14, and a moving iron core 16 is arranged inside, corresponding to the outside of the coil 15. An electromagnetic shell 17 is provided; the top of the movable column 601 is connected to the lower end 16 of the moving iron core, and a sealing rubber pad 18 is provided at the bottom of the movable frame 602. The upper end of the upper spring 7 is sleeved on the electromagnetic shell 17, and the lower end is sleeved in the outer ring protrusion 604; the lower valve head assembly includes a lower valve core 19 and a lower spring 20. The top of the lower valve core 19 passes through the vent hole 5 and is movably connected to the movable column 601. The upper end of the lower spring 20 is sleeved on the lower valve core 19, and the lower end of the lower spring 20 is provided on the valve seat 12.

[0021] like Figure 3 As shown, the stopper includes a metal sliding pin 8 and two sealing rings 9, and the driving member includes a magnet block 10; specifically, the metal sliding pin 8 includes an adsorption portion 801, a connecting portion 802 and a stopper 803, and the two sealing rings 9 are spaced apart on the connecting portion 802, and the cross-sectional shape of the stopper 803 is consistent with the inner ring shape of the outer boss 3.

[0022] During production of the present invention, power is first applied to cause the moving iron core 16 to be attracted to drive the upper valve core 6 to overcome the elastic force of the upper spring 7 and move upward, and then the metal slide pin 8 is pushed inward by using an external auxiliary tool to form a stable locking structure with the buckle 603, and then the power is turned off, and then the magnet block 10 is installed on the external tube 4, and finally the dust cover is covered and it can be delivered; the isolation valve in the delivery state is always in the open state, and sealing testing and production line refueling can be carried out without powering on; after the client turns on the power, the iron core is attracted to drive the upper valve core 6 to overcome the elastic force of the upper spring 7 and move upward away from the metal slide pin 8, and the stop part 803 is moved away from the upper valve core 6 under the action of the suction force of the magnet block 10 until the adsorption part 801 is in close contact with the magnet block 10, and the stop part 803 forms a sealing structure with the outer boss 3, and the isolation valve can work normally.

[0023] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, technicians in this field can make some substitutions and deformations of some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A fuel tank isolation valve that can be kept open, comprising a valve housing with a cavity therein, the valve housing comprising a frustum that divides the cavity into an upper tube cavity and a lower tube cavity, a fuel tank pipe joint connected to the upper tube cavity, a vent hole being formed on the frustum, an upper valve head assembly for moving closer to or away from the frustum to block or open the vent hole being provided in correspondence with the upper tube cavity, a lower valve head assembly for moving closer to or away from the frustum to block or open the vent hole being provided in correspondence with the lower tube cavity, and a solenoid valve assembly for controlling the upper valve head assembly to move closer to or away from the frustum being provided in correspondence with the top of the valve housing, characterized in that: The upper valve head assembly includes an upper valve core and an upper spring. The upper spring provides elastic force to drive the upper valve core close to the frustum. The valve housing is provided with a stopper that can be close to or away from the upper valve core. When the stopper is close to the upper valve core, it forms a snap-fit ​​structure with the upper valve core to open the vent hole, and when it is away from the upper valve core, it forms a sealing structure with the valve housing.

2. A fuel tank isolation valve that can be kept open according to claim 1, characterized in that: The valve housing further comprises an outer boss and an outer tube. The stopper is movably connected to the outer boss. The outer tube is provided with a driving member for driving the stopper away from the upper valve core. A dust cap is provided at the outward end.

3. A tank isolation valve that can be kept open according to claim 2, characterized in that: The stopping member includes a metal sliding pin and a plurality of sealing rings, and the driving member includes a magnet block.

4. A tank isolation valve that can be kept open according to claim 3, characterized in that: The metal sliding pin includes an adsorption portion, a connecting portion and a stopping portion. Several sealing rings are arranged on the connecting portion at intervals. The cross-sectional shape of the stopping portion is consistent with the shape of the inner ring of the outer boss.

5. The tank isolation valve that can be kept open according to claim 1, characterized in that: The upper valve core includes a movable column, a movable frame, a buckle and an outer ring protrusion, the buckle is arranged on the outside of the movable frame, the outer ring protrusion is arranged on the side of the movable frame away from the truncated table, and a pressure relief passage is opened on the movable frame.

6. The tank isolation valve capable of being held open according to claim 1, wherein: The top of the upper valve core is connected to the electromagnetic valve assembly, and a sealing rubber pad is provided at the bottom. The upper end of the upper spring is sleeved on the electromagnetic valve assembly, and the lower end is sleeved on the upper valve core.

7. The tank isolation valve capable of being held open according to claim 1, wherein: A valve seat is provided corresponding to the bottom of the valve housing, and the valve seat includes a carbon canister pipeline joint communicated with the lower tube cavity.

8. A tank isolation valve capable of being held open according to claim 7, characterized in that: The lower valve head assembly includes a lower valve core and a lower spring. The top of the lower valve core is movably connected to the upper valve head through the vent hole. The upper end of the lower spring is sleeved on the lower valve core, and the lower end of the lower spring is arranged on the valve seat.

9. A fuel tank isolation valve capable of being kept open according to any one of claims 1 to 7, characterized in that: The solenoid valve assembly includes a coil skeleton, a coil is wound around the outside of the coil skeleton, a moving iron core is arranged inside the coil skeleton, and an electromagnetic shell is arranged corresponding to the outside of the coil.

Images