CN106382170A - Internal gradient valve having automatic sealing position adjusting function - Google Patents

Abstract

The invention discloses an internal gradient valve having an automatic sealing position adjusting function. The gradient valve comprises a bonnet, a stop disk, a valve body, a float and a base; a gas outlet is formed in the top end of the valve body; the stop disk is arranged at the gas outlet; a groove in the bottom end of the valve body and a flange at the upper end of the base are connected in an assembled manner; a spring seat for mounting a spring is arranged in the middle of the bottom of the base; the spring is used for supporting the float; a second through hole is formed in the middle of the spring seat, and first through holes are formed in the edge of the spring seat; a flange at the outer part of the valve body and a groove in the bottom end of the bonnet are connected in an assembled manner; a sealing ring is arranged in a groove in the upper part of the valve body; a flange at the top end of the valve body and a groove in the lower end of a support frame are connected in an assembled manner; a groove adopting a wedge-shaped structure and a flange of a buckle are connected in an assembled manner; and one end of a membrane is fixed on the float. With the gradient valve, penetrating leakage of oil and gas molecules can be reduced, and meanwhile, the machining cost of an oil tank can be reduced; and through cooperation of wedge-shaped structures, oil in the oil tank can be prevented from leaking when a car is turned over or inclined.

Description

A built-in slope valve with self-adjusting sealing position function

technical field

The invention belongs to the field of recovery devices for vehicle-mounted gasoline vapor, in particular to a built-in gradient valve with the function of self-adjusting sealing position.

Background technique

In order to solve the pollution problem of fuel vapor emission during the refueling process, most domestic cars are now equipped with activated carbon tank type fuel vapor emission control devices. The emission of steam can easily cause "overloading" of the activated carbon tank. Therefore, there are slope valves, oil volume control valves, etc. in the vehicle-mounted oil and gas recovery device. The slope valve is a normally closed valve, which is used together with the oil volume control valve. When the oil volume control valve is working, the slope valve is in the closed state to maintain the pressure in the fuel tank; when the float in the slope valve rises to the sealing position, the slope valve is no longer exhaust. When the vehicle rolls over, because the density of the float is greater than that of the oil, the float first closes the air outlet, the slope valve is closed, and the oil will not leak out of the fuel tank through the slope valve.

There are many foreign patents on gradient valves. The US patent US11523012 proposes a gradient valve. The valve body shell has a fluid inlet and a fluid outlet. The valve seat contains a fluid outlet of the valve body, and the float is placed in the valve body. And it can move axially. The sealing part leans against the outlet of the valve seat to achieve the purpose of sealing. When the valve is in the open state, the sealing part is separated from the valve seat, and the fluid inlet and fluid outlet are connected. U.S. Patent US10807145 proposes a slope valve, which includes a basic valve and an additional valve responsive to pressure. There is a partition between them; the basic valve and the additional valve cooperate with each other to block the fluid movement between the inlet and outlet of the slope valve. However, when the slope valve is working, under the condition of high flow rate, it is difficult to guarantee the working state of the valve, especially when the vehicle rolls over, the sealing effect is not good. In addition, some slope valves are installed outside the fuel tank. Although the material of the valve is polymer material, oil and gas molecules will still seep out through the gap of the valve polymer material, making the effect of oil and gas recovery poor.

Contents of the invention

In order to overcome the disadvantages of the activated carbon tank type fuel evaporation control device commonly used in the prior art, the present invention provides a built-in slope valve with self-adjusting sealing position function, which can effectively control the evaporation and emission of fuel during refueling.

The present invention adopts following technical scheme:

A built-in slope valve with self-adjusting sealing position function, including bonnet, baffle, valve body, float and base,

There is an air outlet hole at the middle of the top of the valve body, and the baffle plate is placed above the air outlet hole. On the one hand, the baffle plate is used to maintain the pressure in the fuel tank during refueling. On the other hand, when the pressure value in the fuel tank changes sharply, The baffle plate rises, and the air outlet hole opens to discharge part of the oil and gas in the tank; the wedge-shaped structure at the lower end of the air outlet hole cooperates with the wedge-shaped structure at the top of the float to ensure the sealing effect; the groove at the bottom of the valve body is assembled with the flange at the upper end of the base connection, the middle position of the bottom of the base is provided with a spring seat for installing a spring, the spring is used to support the float, the middle position of the spring seat is provided with a second through hole, and the edge is provided with N first through holes, N is an even number; the flange on the outside of the valve body is assembled and connected to the groove at the bottom of the valve cover; a sealing ring is provided in the groove on the upper part of the valve body to seal the channel between the valve cover and the valve body, blocking Gas circulation; the middle part of the valve cover is provided with a groove for installing the built-in slope valve in the fuel tank; the flange on the top of the valve body is assembled and connected with the groove at the lower end of the support frame, and the support frame is used for the built-in slope Limit the distance that the stopper moves when the valve is overturned;

The groove of the wedge-shaped structure at the top of the float is assembled and connected with the flange of the buckle, so as to fix one end of the diaphragm on the float, and the diaphragm completely covers the surface of the wedge-shaped structure at the top of the float.

In the above solution, both the valve cover and the vent hole on the valve cover are installed inside the fuel tank; the vent hole is externally connected to an activated carbon tank for absorbing the oil gas discharged from the fuel tank.

In the above solution, the slope of the wedge-shaped structure at the lower end of the air outlet is equivalent to the slope of the wedge-shaped structure at the top of the float, and the slope is between 1:10-1:12.

In the above solution, the projected area of the wedge-shaped structure at the top of the float and the diaphragm on the horizontal plane is larger than the projected area of the exhaust hole on the horizontal plane.

In the above solution, the buckle, diaphragm, float and spring are placed in the lower valve chamber.

In the above solution, the baffle plate is placed in the upper valve chamber.

In the above solution, the air outlet is placed between the upper valve chamber and the lower valve chamber.

In the above solution, the diameter of the baffle plate is greater than the maximum length of the exhaust hole, and the ratio of the diameter of the baffle plate to the inner diameter of the upper valve chamber is 0.8-0.85.

In the above solution, the height of the support frame is greater than the depth of the upper valve chamber, and the diameter of the support frame is greater than the diameter of the baffle plate.

The beneficial effects of the present invention are: all the built-in slope valves of the present invention are installed in the fuel tank, which can reduce the leakage of oil and gas molecules from the material molecules of the slope valve to the outside of the fuel tank. processing steps to reduce the processing cost of the fuel tank. The wedge-shaped structure at the top of the float cooperates with the wedge-shaped structure at the lower end of the air outlet. When the car is tilted or when the axis of the float deviates too much from the central axis of the valve body, the slope of the wedge-shaped structure at the top of the float and the lower end of the air outlet is equivalent. Make the wedge-shaped structure on the top of the float slide along the wedge-shaped structure on the valve body to adjust to the best sealing position, and use the diaphragm together to make the sealing effect better.

Description of drawings

Fig. 1 is a structural schematic diagram of a built-in slope valve with self-adjusting sealing position function;

Figure 2 is an enlarged view of I in Figure 1.

In the figure: 1-bonnet; 2-support frame; 3-baffle plate; 4-sealing ring; 5-valve body; 6-buckle; 7-diaphragm; 8-float; 9-spring; 10-base; a-exhaust hole; b-upper valve chamber; e-lower valve chamber; f-air outlet; h-first through hole; g-second through hole; m-groove.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to accompanying drawing 1, a built-in slope valve with the function of self-adjusting sealing position, including valve cover 1, baffle plate 3, valve body 5, float 8 and base 10, valve cover 1 and vent hole a on valve cover 1 Both are installed inside the fuel tank; the exhaust hole a is externally connected to the activated carbon tank, which is used to absorb the oil and gas discharged from the fuel tank;

There is an air outlet f in the middle of the top of the valve body 5, and the baffle plate 3 is placed above the air outlet f. On the one hand, the baffle plate 3 is used to maintain the pressure in the fuel tank during refueling. When changing, the baffle plate 3 rises to discharge a part of the oil and gas in the fuel tank; the wedge-shaped structure at the lower end of the air outlet f and the wedge-shaped structure at the top of the float 8 (it can be used when the vehicle is tilted, or when the built-in gradient valve is working). 8 when the central line deviates too much to ensure the tightness) fit, the wedge-shaped structure at the top of the float 8 is equivalent to the slope of the wedge-shaped structure at the lower end of the air outlet f, and the slope is between 1:10-1:12, the present invention Preferably 1:10; the groove at the bottom of the valve body 5 is assembled and connected with the flange on the upper end of the base 10, the middle position of the bottom of the base 10 is provided with a spring seat for installing the spring 9, the spring 9 is used to support the float 8, and the middle position of the spring seat is provided There is a second through hole g, and four radially arranged first through holes h are arranged at the edge; the flange outside the valve body 5 is assembled and connected with the groove at the bottom end of the valve cover 1; the groove on the upper part of the valve body 5 is provided with There is a sealing ring 4, which is used to seal the passage between the valve cover 1 and the valve body 5, and blocks the gas flow; the middle part of the valve cover 1 is provided with a groove m, which is used to install the built-in slope valve in the fuel tank; the top of the valve body 5 The flange of the flange is assembled and connected with the groove at the lower end of the support frame 2, and the support frame 2 is used to limit the moving distance of the baffle plate 3 when the built-in slope valve is turned over;

The wedge-shaped groove at the top of the float 8 is assembled and connected with the flange of the buckle 6 to fix one end of the diaphragm 7 on the float 8, and the diaphragm 7 (with flanges around to ensure the sealing effect) completely covers the float 8 The surface of the wedge-shaped structure at the top, the projected area of the wedge-shaped structure at the top of the float 8 and the diaphragm 7 on the horizontal plane are larger than the projected area of the air outlet f on the horizontal plane.

The baffle plate 3 is placed in the upper valve chamber b, the buckle 6, the diaphragm 7, the float 8 and the spring 9 are placed in the lower valve chamber e, the air outlet f is placed between the upper valve chamber b and the lower valve chamber e; the float The outer diameter of 8 is smaller than the inner diameter of lower valve chamber e; the diameter of baffle plate 3 is greater than the maximum length of air outlet f, and the ratio of the diameter of baffle plate 3 to the inner diameter of upper valve chamber b is 0.8-0.85, and the present invention is preferably 0.84 ; The height of the support frame 2 is greater than the depth of the upper valve chamber b to ensure that the baffle plate 3 will not break away from the upper valve chamber e; the diameter of the support frame 2 is greater than the diameter of the baffle plate 3 .

The working process of a built-in slope valve with self-adjusting sealing position function:

The built-in gradient valve of the present invention is a normally closed valve, that is, during the refueling process, the retaining plate 3 of the gradient valve is pressed against the upper end of the air outlet f due to gravity to maintain a certain gas pressure in the fuel tank. There is no communication between the first through hole h and the second through hole g. As the refueling continues, the pressure in the fuel tank continues to increase, and the oil and gas will pass through the first through hole h, the second through hole g on the base and the gap between the float 8 and the inner wall of the lower valve chamber e from the air outlet f to the upper valve chamber b , when the pressure in the fuel tank reaches a certain value, the baffle plate 3 of the slope valve rises under the action of the difference between the internal pressure of the fuel tank and the atmospheric pressure outside the fuel tank, and the air outlet f opens, and the oil and gas flow through the air outlet f, and then flow in through the air outlet a In the activated carbon tank, the change of gas pressure in the fuel tank is smooth. Restricted by the top surface of the support frame 2, the baffle plate 3 will not leave the support frame 2 after it moves up, preventing the baffle plate 3 from deviating from the air outlet f. When the refueling quantity of the automobile reaches a predetermined value, refuel in the fuel tank at this time, the pressure difference of the gas inside and outside the fuel tank continues to increase, and when the air pressure difference is greater than 0.003MPa, the float 8 rises, the air outlet f is closed, and the slope valve is closed. When the car rolls over, because the density of the float 8 is greater than the density of the fuel, the float 8 will be pressed on the air outlet f under the action of gravity, so that the main channel of the slope valve will be disconnected, thereby closing the slope valve, and avoiding the fuel tank when the car rolls over. Gasoline spilled. When the axis center of the float 8 deviates, since the slope of the wedge-shaped air outlet on the float 8 and the valve body 5 is equivalent, the wedge-shaped structure on the float 8 can slide along the wedge-shaped air outlet structure on the valve body 5, and the diaphragm is used together. 7. Make the sealing effect better.

A built-in slope valve with self-adjusting sealing position function provided by the present invention has been introduced in detail above. The present invention has applied specific examples to illustrate the principle and implementation of the present invention. What is to be explained is that the above is only It is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. a kind of built-in slope valve with self-adjusting seal position functions it is characterised in that include valve gap (1), block plate (3), Valve body (5), float (8) and base (10),

Described valve body (5) top centre position is provided with venthole (f), and described block plate (3) is placed in above venthole (f), block plate (3) On the one hand it is used in refueling process, maintaining the pressure in fuel tank, on the other hand, when tank pressure value drastically changes, block plate (3) rise and discharge a part of oil gas in fuel tank；The wedge shape structure of described venthole (f) lower end and the wedge shape on float (8) top Shape respective outer side edges are it is ensured that sealing effectiveness；The groove of described valve body (5) bottom and the flange assembly connection of base (10) upper end, institute State base (10) bottom centre position and be provided with the spring abutment installing spring (9), described spring (9) is in order to support float (8), described spring The centre position of seat is provided with the second through hole (g), edge is provided with N number of first through hole (h), and N is even number；Described valve body (5) is outside Flange and valve gap (1) bottom groove assembly connection；It is provided with sealing ring (4), for close in the groove on described valve body (5) top Passage between envelope valve gap (1) and valve body (5), blocks gas circulation；It is provided with groove (m), for will be interior in the middle part of described valve gap (1) Put slope valve to be installed in fuel tank；The flange on described valve body (5) top and the groove assembly connection of support (2) lower end, described Support (2) is used for limiting the distance of block plate (3) movement during built-in slope valve upset；

The groove of wedge shape structure on described float (8) top and the flange assembly connection of buckle (6), realize diaphragm (7) One end is fixed on float (8), and described diaphragm (7) is completely covered the surface of the wedge shape structure on float (8) top.

2. a kind of built-in slope valve with self-adjusting seal position functions according to claim 1 is it is characterised in that institute State valve gap (1) and be mounted on fuel tank internal with the steam vent (a) on valve gap (1)；The external charcoal canister of steam vent (a), for inhaling Receive the oil gas discharged in fuel tank.

3. a kind of built-in slope valve with self-adjusting seal position functions according to claim 1 is it is characterised in that institute The wedge shape structure stating venthole (f) lower end is suitable with the gradient of the wedge shape structure on float (8) top, and gradient is 1:10-1: Between 12.

4. a kind of built-in slope valve with self-adjusting seal position functions according to claim 1 is it is characterised in that institute State the wedge shape structure on float (8) top and diaphragm (7) horizontal plane projected area than steam vent (f) horizontal plane projection Area is big.

5. a kind of built-in slope valve with self-adjusting seal position functions according to claim 1 is it is characterised in that institute State buckle (6), diaphragm (7), float (8) and spring (9) to be placed in lower valve chamber (e).

6. a kind of built-in slope valve with self-adjusting seal position functions according to claim 1 is it is characterised in that institute State block plate (3) to be placed in valve chamber (b).

7. a kind of built-in slope valve with self-adjusting seal position functions according to claim 5 or 6, its feature exists In described venthole (f) is placed between valve chamber (b) and lower valve chamber (e).

8. a kind of built-in slope valve with self-adjusting seal position functions according to claim 6 is it is characterised in that institute State the maximum length with diameter greater than steam vent (f) of block plate (3), the diameter of block plate (3) and the ratio of the internal diameter of upper valve chamber (b) are 0.8-0.85.

9. a kind of built-in slope valve with self-adjusting seal position functions according to claim 6 is it is characterised in that institute The height stating support (2) is more than the depth of upper valve chamber (b), the diameter with diameter greater than block plate (3) of support (2).