Valve element sealing structure of isolating valve of automobile fuel tank

Abstract

The utility model relates to the technical field of hybrid electric vehicles, and discloses a valve core sealing structure of an isolating valve of an automobile oil tank, which comprises an isolating valve and an electromagnetic valve arranged at the top of the isolating valve, a sealing mechanism is arranged in the isolating valve, and the sealing mechanism can seal a first stress plate along with the loss of pressure of a pressing plate on the first stress plate. A first spring drives a first stress plate and a sealing ring to move upwards, at the moment, the bottom end of the sealing ring is far away from the top end of a ventilation plate, so that a sealed ventilation hole is opened, meanwhile, a pressing column is driven to move, and a second stress plate and a sealing rubber ring are driven to move upwards along with springback of a second spring; the bottom end of the isolating valve is in a completely communicated state, air leakage operation is completed, it is worthy that the sealing rubber ring is in a cylinder shape with the smooth outer wall, compared with a traditional rubber ring with corners, the occupied space of the bottom end of the interior of the isolating valve can be greatly reduced, oil gas resistance is reduced, and the service life of the isolating valve is prolonged. And the air leakage rate is improved.

Description

Technical Field

[0001] This utility model belongs to the field of hybrid vehicle technology, specifically, it relates to a valve core sealing structure for an automotive fuel tank isolation valve. Background Technology

[0002] The charcoal canister evaporation system used in PHEV vehicles to meet China VI emission standards for evaporation and refueling differs from that in traditional vehicles. This system has a strict regulatory definition—a non-integrated evaporation system that only controls refueling emissions (regulated as the NIRCO system). It mainly includes two important components: a high-pressure fuel tank and a fuel tank isolation valve (FTIV valve). The high-pressure fuel tank can withstand higher vapor pressures, ensuring that fuel vapors are firmly sealed within the tank during driving. The FTIV valve plays a crucial role in this process. Under normal circumstances, the FTIV valve remains closed. It only opens when a refueling request occurs, the fuel tank pressure exceeds a certain threshold, or there is a significant negative pressure inside, releasing fuel vapors from the tank into the charcoal canister. Additionally, fuel tank leak detection will also trigger the FTIV valve to open. The high-pressure fuel tank system and FTIV valve control ensure that PHEV vehicles easily meet China VI emission standards for evaporation and refueling.

[0003] However, the sealing rubber ring inside the existing isolation valve is designed with a corner shape, which will occupy the space of the venting channel during the venting process, thereby slowing down the oil and gas, resulting in a slower venting process and reduced working efficiency.

[0004] In view of this, this utility model is hereby proposed. Utility Model Content

[0005] To address the aforementioned technical problem that existing isolation valves use sealing rubber rings with angular shapes, which occupy space in the venting channel during venting and thus hinder oil and gas flow, resulting in a slower venting process and reduced efficiency, the basic concept of this invention is as follows:

[0006] A valve core sealing structure for an automotive fuel tank isolation valve, comprising an isolation valve;

[0007] A solenoid valve is disposed at the top of the isolation valve, and a sealing mechanism is provided inside the isolation valve. The sealing mechanism includes a pressure plate fixedly connected to the outer wall of the output end of the solenoid valve.

[0008] A pressure column is fixedly connected to the output end of the solenoid valve. A first spring is fixedly connected to the bottom end of the solenoid valve. A first force plate is fixedly connected to the end of the first spring away from the solenoid valve. A sealing ring is fixedly connected to the bottom end of the first force plate. A vent plate is fixedly connected to the bottom end of the inner wall of the isolation valve. A vent hole is provided on the vent plate. A slot is provided at the bottom end of the vent plate. A retaining ring is engaged with the inner wall of the slot. A second force plate is fixedly connected to the end of the retaining ring away from the slot. A sealing rubber ring is fixedly connected to the bottom end of the second force plate. A groove is provided at the bottom end of the sealing rubber ring. A second spring is fixedly connected to the inner wall of the groove. The end of the second spring away from the inner wall of the groove is fixedly connected to the bottom end of the inner wall of the isolation valve. A retaining sleeve is fixedly connected to the bottom end of the inner wall of the isolation valve.

[0009] In a preferred embodiment of this utility model, the outer wall of the isolation valve is connected to an oil tank connecting pipe, and the outer wall of the isolation valve on the opposite side of the oil tank connecting pipe is connected to a carbon canister connecting pipe.

[0010] In a preferred embodiment of this utility model, the outer wall of the sealing ring is larger than the inner wall of the vent hole, and the sealing ring is made of rubber.

[0011] In a preferred embodiment of this utility model, the inner wall of the sealing rubber ring is slightly smaller than the outer wall of the ferrule.

[0012] In a preferred embodiment of the present invention, the first force-bearing plate has a first through hole at its top end, and the outer wall of the pressure plate is larger than the inner wall of the first through hole. The second force-bearing plate has a second through hole at its top end, and the outer wall of the pressure column is larger than the inner wall of the second through hole.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] In this invention, the solenoid valve will activate its output end, causing the pressure plate to move upward. As the pressure plate moves, it loses pressure on the first force plate. Then, due to the rebound of the first spring, it will move the first force plate upward. This movement of the first force plate will then move the sealing ring at its bottom upward, causing the bottom of the sealing ring to move away from the top of the vent plate, thus opening the sealed vent. This allows the oil and gas inside the oil tank connecting pipe to be transmitted. Simultaneously, the movement of the solenoid valve's output end will also cause the pressure column to move upward, causing it to lose pressure on the second force plate. The rebound of the second spring causes the second force plate to move upward. This movement of the second force plate causes the sealing rubber ring at the bottom to move upward, disengaging it from the clamp seal and ensuring the bottom of the isolation valve is fully open. At this point, the oil and gas will be transmitted through the bottom of the isolation valve to the carbon canister connecting pipe, completing the venting operation. It is worth mentioning that the sealing rubber ring is a smooth cylindrical shape. Compared to traditional rubber rings with corners, this design greatly reduces the space occupied at the bottom of the isolation valve, thereby reducing the obstruction of oil and gas and increasing the venting rate.

[0015] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of part of the sealing mechanism of this utility model. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of part of the sealing mechanism of this utility model. Figure 2 .

[0021] In the diagram: 1. Isolation valve; 2. Solenoid valve; 31. Sealing mechanism; 311. Pressure plate; 312. Pressure column; 313. First force plate; 314. First spring; 315. Sealing ring; 316. Vent plate; 317. Vent hole; 318. Slot; 319. Snap ring; 3110. Second force plate; 3111. Sealing rubber ring; 3112. Second spring; 3113. Sleeve; 3114. Oil tank connecting pipe; 3115. Carbon canister connecting pipe. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0023] like Figures 1 to 4 As shown, a valve core sealing structure for an automotive fuel tank isolation valve includes an isolation valve 1, a solenoid valve 2 disposed at the top of the isolation valve 1, and a sealing mechanism 31 disposed inside the isolation valve 1. The sealing mechanism 31 includes a pressure plate 311 fixedly connected to the outer wall of the output end of the solenoid valve 2, a pressure column 312 fixedly connected to the output end of the solenoid valve 2, a first spring 314 fixedly connected to the bottom end of the solenoid valve 2, a first force plate 313 fixedly connected to the end of the first spring 314 away from the solenoid valve 2, a sealing ring 315 fixedly connected to the bottom end of the first force plate 313, and a vent plate 31 fixedly connected to the bottom end of the inner wall of the isolation valve 1. 6. A vent hole 317 is provided on the vent plate 316. A groove 318 is provided at the bottom end of the vent plate 316. A retaining ring 319 is engaged with the inner wall of the groove 318. A second force plate 3110 is fixedly connected to the end of the retaining ring 319 away from the groove 318. A sealing rubber ring 3111 is fixedly connected to the bottom end of the second force plate 3110. A groove is provided at the bottom end of the sealing rubber ring 3111. A second spring 3112 is fixedly connected to the inner wall of the groove. The end of the second spring 3112 away from the inner wall of the groove is fixedly connected to the bottom end of the inner wall of the isolation valve 1. A retaining sleeve 3113 is fixedly connected to the bottom end of the inner wall of the isolation valve 1.

[0024] Furthermore, an oil tank connecting pipe 3114 is provided on the outer wall of the isolation valve 1, and a carbon canister connecting pipe 3115 is provided on the outer wall of the isolation valve 1 on the opposite side of the oil tank connecting pipe 3114.

[0025] Furthermore, the outer wall of the sealing ring 315 is larger than the inner wall of the vent 317, and the sealing ring 315 is made of rubber. This ensures that the sealing ring 315 can completely block and seal the vent 317, thus ensuring a good sealing effect.

[0026] Furthermore, the inner wall of the sealing rubber ring 3111 is slightly smaller than the outer wall of the ferrule 3113. As the sealing rubber ring 3111 moves downward, it can be squeezed by the outer wall of the ferrule 3113. Then, through the elasticity of its rubber material, it tightly wraps around the outer wall of the ferrule 3113, thereby improving the sealing effect.

[0027] Furthermore, the first force-bearing plate 313 has a first through hole at its top, and the outer wall of the pressure plate 311 is larger than the inner wall of the first through hole. The second force-bearing plate 3110 has a second through hole at its top, and the outer wall of the pressure column 312 is larger than the inner wall of the second through hole. In this way, when the pressure plate 311 and the pressure column 312 move downward, they can be blocked by the first force-bearing plate 313 and the second force-bearing plate 3110, and then move downward by the pressure of the two.

[0028] The implementation principle of the valve core sealing structure of the automotive fuel tank isolation valve in this embodiment is as follows: When the vehicle is refueling, when a large negative pressure is generated inside the isolation valve 1, the sensor can open the isolation valve 1. At this time, the solenoid valve 2 will activate its output end to drive the pressure plate 311 to move upward. As the pressure plate 311 moves, it will lose pressure on the first force plate 313. Then, with the rebound action of the first spring 314, it can drive the first force plate 313 to move upward. As the first force plate 313 moves, it can drive the sealing ring 315 at its bottom end to move upward. At this time, the bottom end of the sealing ring 315 will move away from the top of the vent plate 316, thereby opening the sealed vent hole 317. In this way, the oil and gas inside the fuel tank connecting pipe 3114 can be connected and transmitted. At the same time, during the movement of the output end of the solenoid valve 2, it can also drive the pressure plate 311 to move upward. The dynamic pressure column 312 moves upward, causing it to lose pressure on the second force plate 3110. At this time, the second spring 3112 rebounds, causing the second force plate 3110 to move upward. The movement of the second force plate 3110 causes the sealing rubber ring 3111 at the bottom to move upward, causing the sealing rubber ring 3111 to disengage from the snap seal between it and the sleeve 3113. This puts the bottom of the isolation valve 1 in a fully connected state. At this time, the oil and gas will be transmitted through the bottom of the isolation valve 1 to the carbon canister connecting pipe 3115, completing the venting operation. It is worth mentioning that the sealing rubber ring 3111 is a smooth cylindrical shape. Compared with the traditional rubber ring with corners, this design greatly reduces the space occupied at the bottom of the isolation valve 1, thereby reducing the obstruction of oil and gas and improving the venting rate.

Claims

1. A valve core sealing structure for an automotive fuel tank isolation valve, comprising an isolation valve (1); The solenoid valve (2) disposed on top of the isolation valve (1) is characterized in that, The isolation valve (1) is provided with a sealing mechanism (31), which includes a pressure plate (311) fixedly connected to the outer wall of the output end of the solenoid valve (2): The output end of the solenoid valve (2) is fixedly connected to a pressure column (312), and the bottom end of the solenoid valve (2) is fixedly connected to a first spring (314). The end of the first spring (314) away from the solenoid valve (2) is fixedly connected to a first force plate (313), and the bottom end of the first force plate (313) is fixedly connected to a sealing ring (315). The bottom end of the inner wall of the isolation valve (1) is fixedly connected to a vent plate (316), and the vent plate (316) has a vent hole (317). The bottom end of the vent plate (316) has a slot (318). (318) A retaining ring (319) is snapped into the inner wall. A second force plate (3110) is fixedly connected to the end of the retaining ring (319) away from the retaining groove (318). A sealing rubber ring (3111) is fixedly connected to the bottom end of the second force plate (3110). A groove is opened at the bottom end of the sealing rubber ring (3111). A second spring (3112) is fixedly connected to the inner wall of the groove. The end of the second spring (3112) away from the inner wall of the groove is fixedly connected to the bottom end of the inner wall of the isolation valve (1). A retaining sleeve (3113) is fixedly connected to the bottom end of the inner wall of the isolation valve (1).

2. The valve core sealing structure of an automotive fuel tank isolation valve according to claim 1, characterized in that, The outer wall of the isolation valve (1) is connected to an oil tank connecting pipe (3114), and the outer wall of the isolation valve (1) on the opposite side of the oil tank connecting pipe (3114) is connected to a carbon canister connecting pipe (3115).

3. The valve core sealing structure of an automotive fuel tank isolation valve according to claim 1, characterized in that, The outer wall of the sealing ring (315) is larger than the inner wall of the vent (317), and the sealing ring (315) is made of rubber.

4. The valve core sealing structure of an automotive fuel tank isolation valve according to claim 1, characterized in that, The inner wall of the sealing rubber ring (3111) is slightly smaller than the outer wall of the ferrule (3113).

5. The valve core sealing structure of an automotive fuel tank isolation valve according to claim 1, characterized in that, The first force-bearing plate (313) has a first through hole at its top end, and the outer wall of the pressure plate (311) is larger than the inner wall of the first through hole. The second force-bearing plate (3110) has a second through hole at its top end, and the outer wall of the pressure column (312) is larger than the inner wall of the second through hole.

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