CN105804893B - A kind of slow pressure valve of the vacuum for vehicle-mounted oil vapor recovery device - Google Patents

Abstract

The invention discloses a vacuum pressure relief valve used for a vehicle-mounted oil and gas recovery device in an automobile. The valve body is provided with an oil and gas port, a carbon tank port, a vacuum valve chamber and a pressure relief valve chamber; one end of the oil and gas port is connected through a pipeline. The other end of the oil tank is connected to and communicated with one end of the pressure relief valve chamber, one end of the canister port is connected to the canister through a connecting pipe, and the other end is connected to one end of the vacuum valve chamber, and the side wall of the oil and gas port is connected to and communicated with the vacuum valve chamber through the first communication hole The side wall is connected between the side wall of the carbon canister port and the pressure relief valve chamber and communicates with the second communication hole; a vacuum valve is arranged in the vacuum valve chamber; the vacuum valve is opened, and the vacuum valve chamber and the carbon canister port are connected; The valve chamber is provided with a pressure relief valve core, a push piece, a bracket, a spring top seat and a second spring. When the internal pressure of the oil tank exceeds the limit value, the oil and gas port communicates with the pressure relief valve chamber; the present invention combines the pressure relief valve and the vacuum The function and structure of the valve are integrated, the structure is simple, and the installation is convenient.

Description

A vacuum pressure relief valve used in a vehicle-mounted oil and gas recovery device

technical field

The invention belongs to the field of automobiles, and relates to a vehicle-mounted gasoline vapor recovery device, which recovers gasoline vapor discharged from a fuel tank during refueling, and particularly relates to a vacuum relief valve in the recovery device.

Background technique

In order to solve the problem of evaporative pollution of fuel in the fuel tank of automobiles, activated carbon tank type fuel evaporative pollutant control devices are installed on most gasoline vehicles to recover evaporated fuel. Various oil and gas valves such as volume control valves, pressure relief valves and vacuum valves must be installed on the oil tank. The pressure relief valves and vacuum valves are two independent valves, which are self-contained and installed separately. This device has the following insufficient:

1. Various oil and gas valves need to find a suitable position on the fuel tank. Due to the relationship between the volume of the fuel tank and the installation position, the upper surface of the fuel tank is generally irregular in structure, and each valve must find a suitable position on the fuel tank. A large number will increase the installation position of the valve, which is not conducive to the reliable installation of various valves.

2. Various oil and gas valves are respectively installed on the upper surface of the fuel tank, and bosses and through holes are added to the upper surface of the fuel tank to arrange and install the oil and gas valves, which increases the complexity of the process of fuel tank production.

3. The installation holes on the upper surface of the fuel tank will increase with the increase of oil and gas valves, and the fuel penetration of the fuel tank system will also increase accordingly.

Under normal circumstances, the pressure relief valve is closed. When the external temperature of the fuel tank is high or the car is driving on a bumpy road, a large amount of steam will be generated inside the fuel tank, which will cause the internal pressure of the fuel tank to rise, which will easily cause oil and gas to leak. At this time, the pressure relief valve It will open to allow the oil and gas inside the fuel tank to be sent to the carbon tank; in addition, considering that the oil and gas flow area of the oil volume control valve and the slope valve are small, the pressure in the fuel tank cannot be reduced in a short time, so it is necessary to set a pressure relief valve. When the internal pressure of the fuel tank exceeds 0.11MPa, the pressure in the fuel tank is rapidly reduced.

Under normal circumstances, the vacuum valve is also closed. When the car is running for a long time without refueling, the fuel level in the fuel tank will drop, and a certain degree of vacuum will be generated in the fuel tank. If the vacuum is too large, gasoline cannot be sucked out by the gasoline pump. Thus affecting the engine work; in addition, if the internal pressure of the fuel tank is too low, the external atmospheric pressure will squeeze the fuel tank out of shape. Therefore, it is necessary to set a vacuum valve to suck in external air when the internal pressure of the fuel tank is less than 0.098MPa.

At present, the basic functions of the vacuum valve and the pressure relief valve installed on the fuel tank are the same, mainly because of structural changes, or the use of solenoid valves to make the control more precise. However, each valve can only achieve one function, which requires The number of valves to be arranged increases, making it difficult to arrange in the vehicle installation space.

Contents of the invention

The purpose of the present invention is to overcome the defects of the above-mentioned prior art, and provide a new type of vacuum pressure relief valve for vehicle-mounted oil and gas recovery devices, which integrates the functions and structures of the vacuum valve and pressure relief valve, effectively reducing the number of valves , to facilitate the installation of oil and gas valves, while simplifying the surface structure of the fuel tank, reducing the number of holes on the surface of the fuel tank, and correspondingly reducing the amount of fuel penetration.

The technical scheme adopted by the present invention is: the present invention has a valve body, which is provided with an oil-gas port, a carbon tank port, a vacuum valve chamber and a pressure-relief valve chamber; one end of the oil-gas port is connected to an external oil tank through a pipeline, and the other end Connect and communicate with one end of the pressure relief valve chamber, the other end of the pressure relief valve chamber is an opening and is fixedly connected to the valve body through the second spring base at the opening; one end of the canister port is an opening and is connected to the external carbon canister through the connecting pipe, the canister The other end of the port is connected to one end of the vacuum valve chamber. The other end of the vacuum valve chamber is an opening and is fixedly connected to the valve body through the first spring base. The side wall of the oil and gas port is connected to the side wall of the vacuum valve chamber through the first communication hole. The side wall of the tank port is connected with the pressure relief valve chamber and communicates with the second communication hole; the vacuum valve chamber is provided with a vacuum valve and a first spring, and the vacuum valve is located at the connection between the vacuum valve chamber and the carbon tank port. One end of the spring is pressed against the vacuum valve, and the other end is pressed against the first spring base; when the pressure in the fuel tank is lower than the limit value, the vacuum valve is opened, and the vacuum valve chamber is connected with the port of the carbon tank; Slow pressure spool, push piece, bracket, spring top seat and second spring, the second spring is arranged between the spring top seat of the second spring base, the bracket is fixedly stuck between the slow pressure valve core and spring top seat, and the slow pressure The valve core and push piece are located inside the bracket, one end of the slow pressure valve core is fixedly connected to the spring top seat, and the other end is pressed against the push piece, and there is an air outlet square groove on the side wall of the bracket; when the internal pressure of the fuel tank exceeds the limit value, The push piece is separated from the communication port between the oil-gas port and the pressure-relief valve chamber, and the oil-gas port communicates with the pressure-relief valve chamber through the outlet square groove; when the push piece closes the communication port between the oil-gas port and the pressure-relief valve chamber, the The air outlet square groove is not connected to the oil and gas port.

The present invention is an improvement to the pressure relief valve and the vacuum valve in the original activated carbon canister type fuel oil evaporation pollution control device. The function and structure of the two are integrated, the structure is simple, and the installation is convenient. The valve of the pressure relief valve is opened to allow the oil and gas to be absorbed through the carbon tank. When the internal pressure of the fuel tank is less than 0.098MPa, the air outside the fuel tank is allowed to enter the inside of the fuel tank through the vacuum valve. Under normal circumstances, the two valves of the vacuum pressure relief valve of the present invention are all closed. When the external temperature of the fuel tank is very high or when the car is running on a bumpy road, a large amount of steam will be generated in the fuel tank. In this case, the vacuum The valve is still closed, and the pressure relief valve will be opened to allow the oil and gas inside the fuel tank to enter the carbon tank and be absorbed; when the car is running for a long time without refueling, the fuel level in the fuel tank will decrease, and a certain vacuum will be generated in the fuel tank. When the pressure in the fuel tank is lower than the minimum limit, the pressure relief valve is still closed, the vacuum valve is opened, and the air outside the fuel tank will enter the fuel tank.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Fig. 1 is a structural representation of a vacuum pressure relief valve for a vehicle-mounted oil vapor recovery device of the present invention;

Fig. 2 is an enlarged view of the partial structure inside the pressure relief valve chamber in Fig. 1;

Fig. 3 is a state diagram when the spool 4 is released in Fig. 2;

Fig. 4 is the front view of support 3 among Fig. 2;

Figure 5 is a top view of Figure 4;

Fig. 6 is a structural diagram of the valve body 1 in Fig. 1;

In the figure: 1. Valve body; 2. Push piece; 3. Bracket; 4. Slow pressure valve core; 5. Spring washer; 6. Spring top seat; 7. Spring; 8. Spring base; .Sealing ring; 11. Connecting pipe; 12. Vacuum valve; 13. Spring; 14. Sealing ring; 15. Spring base; a. Vacuum valve chamber; b. Cylindrical boss; c. Blind hole; d. First connection Hole; e. Oil and gas port; f. Pressure relief valve chamber; h. Charcoal tank port; k. Second communication hole; m. Air outlet square groove;

Detailed ways

Referring to Fig. 1, the present invention has a valve body 1, which is provided with an oil-gas port e, a carbon tank port h, a vacuum valve chamber a, and a pressure-relief valve chamber f, wherein one end of the oil-gas port e is connected to the outside through a pipeline The other end of the oil and gas port e is connected to and communicated with one end of the pressure relief valve chamber f, and the other end of the pressure relief valve chamber f is an opening. The spring base 8 is used to fix the valve body 1 through threads at the opening of the pressure relief valve chamber f. A sealing ring 9 is installed between the spring base 8 and the valve body 1 to seal the opening of the pressure relief valve chamber f. One end of the canister port h is an opening, and the opening is connected to the external canister through the connecting pipe 11, and the opening is sealed with a sealing ring 10 between the connecting pipe 11 and the valve body 1; the other end of the canister port h is connected to the vacuum valve chamber a end, the other end of the vacuum valve chamber a is an opening, the valve body 1 is fixedly connected with the spring base 15 at the opening of the vacuum valve chamber a, and the vacuum valve chamber is sealed with a sealing ring 14 between the spring base 15 and the valve body 1 The opening of a is sealed. The side wall of the oil and gas port e is connected to and communicates with the side wall of the vacuum valve chamber a through the first communication hole d. The second communication hole k is connected and communicated between the side wall of the canister port h and the pressure relief valve chamber f.

A vacuum valve 12 and a spring 13 are provided in the vacuum valve chamber a, the vacuum valve 12 is located at one end of the vacuum valve chamber a, that is, at the junction of the vacuum valve chamber a and the port h of the carbon tank, and one end of the spring 13 is pressed against the vacuum valve 12, the other end is pressed against the spring base 15. In order to ensure that the spring 13 is compressed reliably and the position does not shift, the spring base 15 is designed to have a cylindrical boss b protruding into the vacuum valve chamber a, the spring 13 is set on the cylindrical boss b, and the vacuum valve 12 is designed In the shape of a stepped shaft, the center of the cylindrical boss b of the spring base 15 is provided with a blind hole c, which matches the small diameter shaft of the vacuum valve 12, and the small diameter shaft of the vacuum valve 12 extends into the blind hole c. Or adopt clearance fit, the small-diameter shaft of the vacuum valve 12 can move back and forth in the blind hole c, and keep a distance of 20 mm between the small-diameter shaft of the vacuum valve 12 and the bottom of the blind hole c, which can keep the position of the vacuum valve 12 There is no deviation, and enough space can be left for the maximum working stroke of the vacuum valve 12. The outer diameter of the large-diameter shaft of the vacuum valve 12 is larger than the inner diameter of the canister opening h, so that when the vacuum valve 12 is pressed against the valve body 1, the canister opening h is closed by the large-diameter shaft of the vacuum valve 12 .

Referring to Fig. 2 and Fig. 3 in combination with Fig. 1, the pressure relief valve chamber f is provided with a pressure relief valve core 4, a push piece 2, a bracket 3, a spring top seat 6 and a spring 7. The spring 7 is installed between the grooves of the spring base 8 and the spring top seat 6, and grooves are arranged on the spring base 8 and the spring top seat 6 for installing the two ends of the spring 7. Install the pressure relief valve core 4, the push piece 2 and the bracket 3 between the communication port between the oil and gas port e, the pressure relief valve chamber f and the spring top seat 6, and the pressure relief valve core 4 and the push piece 2 are located at Inside the bracket 3, one end of the slow pressure valve core 4 is fixedly connected to the spring top seat 6, the valve core 4 and the spring top seat 6 are fastened by threads and the spring washer 5, and the other end of the slow pressure valve core 4 is pressed against the push piece 2 , the communication port between the slow pressure valve core 4 and the oil and gas port e and the slow pressure valve chamber f is the push piece 2, when the slow pressure valve core 4 moves, push the push piece 2, so that the push piece 2 is pressed on the valve body 1 , close the communication port between the oil and gas port e and the pressure relief valve chamber f. The outer diameter of the push piece 2 is larger than the inner diameter of the communication port between the oil-gas port e and the pressure relief valve chamber f, so that the push piece 2 can reliably close the communication port.

Referring to the structure of the bracket 3 shown in FIG. 4 and FIG. 5 , combined with FIG. 1 , the bracket 3 is fixedly stuck between the pressure relief valve core 4 and the spring top seat 6 , and is movably connected with the valve body 1 . There is an air outlet square groove m on the side wall of the bracket 3. When the bracket 3, the pressure relief valve core 4 and the push piece 2 move away from the communication port between the oil and gas port e and the pressure relief valve chamber f, the push piece 2 Break away from the communication port, and the oil-gas port e communicates with the pressure-relief valve chamber f through the air outlet square groove m. At this time, gasoline vapor enters the pressure-relief valve chamber f from the oil-gas port e and the air outlet square groove m on the bracket 3 ;Conversely, when the bracket 3, the slow pressure valve core 4, and the push piece 2 move towards the connection port between the oil and gas port e and the slow pressure valve chamber f, the push piece 2 will press against and close the oil and gas port e and the slow pressure valve chamber When there is a communication port between f, the air outlet square groove m is not connected to the oil and gas port e, and gasoline vapor cannot enter the pressure relief valve chamber f. The present invention has 4 gas outlet square grooves m, so that the 4 gas outlet square grooves m are evenly distributed along the side wall of the support 3 .

Referring to the structure of the valve body 1 shown in Figure 6, combined with Figures 1-5, the vacuum valve chamber a and the canister port h on the valve body 1 are located in the upper section of the valve body 1, and the pressure relief valve chamber f is located in the valve body 1 In the lower section, there is an oil and gas port e between the pressure relief valve chamber f and the vacuum valve chamber a. The central axes of the vacuum valve chamber a and the canister port h are horizontal and collinear. Below the vacuum valve chamber a is the oil-gas port e, and the oil-gas port e communicates with the vacuum valve chamber a through the first communication hole d. The central axis of the pressure-relief valve chamber f on the valve body 1 is vertical, so that the gravity of the pressure-relief valve core 4 and the push piece 2 is downward, and the valve core 4 can be pressed against the push piece 2 . Central axes of the first communication hole d and the second communication hole k are vertical. The communication port between the oil-gas port e and the pressure relief valve chamber f is provided with an air outlet cylinder y protruding to the inside of the pressure relief valve chamber f, and the central axis of the air outlet cylinder y is vertically arranged so that the air outlet cylinder y has a gap Covered in the central hole of the bracket 3, when the bracket 3 moves, it moves up and down relative to the air outlet cylinder y, and the air outlet square groove m is opened on the upper section of the bracket 3, corresponding to the position of the air outlet cylinder y. The central axes of the bracket 3, the pressure-relief valve core 4, the push piece 2, the spring 7 and the spring base 8 are all in line with the center line of the pressure-relief valve chamber f, and are located at the center of the pressure-relief valve chamber f. The lower end of the pressure valve chamber f, the push piece 2 is above the slow pressure valve core 4, the bracket 3 is a cylinder with an air outlet square groove m on the upper part, and the empty sleeve is placed on the slow pressure valve core 4, the push piece 2 and the cylinder of the air outlet y external. When the push piece 2 is pushed downwards away from the air outlet cylinder y, the bracket 3 also moves downward at the same time, at this moment, the gasoline vapor enters the pressure relief valve chamber f from the air outlet cylinder y and the air outlet square groove m; when the push piece 2. Move in the y direction of the air outlet cylinder until the push piece 2 is pressed against the air outlet cylinder y. At this time, the bottom of the air outlet square groove m is about 1.5mm higher than the top surface of the push piece 2, and gasoline vapor cannot enter the pressure relief valve. Room f.

When the present invention works, under normal conditions, the oil-gas port e communicates with the vacuum valve chamber a through the first communicating hole d, the carbon tank port h communicates with the pressure-relief valve chamber f, and the vacuum valve 12 is closed. When there is no refueling, the fuel level in the fuel tank will decrease, and a certain degree of vacuum will be generated in the fuel tank. When the vacuum is too large, the gasoline cannot be sucked out by the gasoline pump, which will affect the engine operation. Air enters the inside of the fuel tank. Therefore, when the pressure in the fuel tank is lower than the minimum limit value due to excessive vacuum, the pressure acting on the spring 13 will increase because the canister port h communicates with the outside air. At this time, the spring 13 The pressure difference between the internal and external atmosphere will increase. Generally, the minimum pressure in the fuel tank cannot be lower than 0.098MPa. The vacuum valve 12 will open when it only bears the internal and external pressure difference of 0.003MPa. The opening force is generally 1-2N. At this pressure Under the action of the difference, the vacuum valve 12 will leave the valve body 1, so that the vacuum valve chamber a and the canister port h are connected, so as to communicate with the oil and gas port e through the first communication hole d, and the external air will pass through this The passageway enters the oil tank, thus realizing the function of the vacuum valve.

Under normal conditions, the pressure relief valve is closed, that is, the pressure relief valve core 4 and the push piece 2 close the pressure relief valve under the action of the spring 7 . When the external temperature of the fuel tank is very high or the car is driving on a bumpy road, a large amount of steam will be generated in the fuel tank, and when the internal pressure of the fuel tank exceeds the limit value, it is necessary to let the oil and gas inside the fuel tank enter the carbon canister. At this time, because the oil and gas port e communicates with the interior of the fuel tank, when the pressure of the fuel tank exceeds the limit value, the pressure acting on the spring 7 will increase. In addition to gravity, it must bear the difference in atmospheric pressure between the inside and outside. Generally, the maximum pressure in the fuel tank cannot exceed 0.11MPa. When the pressure in the fuel tank increases to 0.11MPa, that is, the difference in atmospheric pressure inside and outside the fuel tank is 0.01MPa. The general opening force is 0.5-1N, so the spring 7 moves downward together with the bracket 3, the slow pressure valve core 4 and the push piece 2 under the action of the internal and external pressure difference and the gravity of the push piece 2 and the pressure relief valve core 4, Leaving the air outlet cylinder y, at this time, gasoline vapor enters the pressure relief valve chamber f from the air outlet cylinder y and the air outlet square groove m on the bracket 3, and the oil and gas in the fuel tank pass through the second communication hole k and the canister opening h This passage is discharged into the carbon canister, so as to realize the function of the pressure relief valve.

Claims (4)

1. A vacuum pressure relief valve for a vehicle-mounted oil and gas recovery device, which has a valve body (1), and is characterized in that: the valve body (1) is provided with an oil and gas port (e), a carbon tank port (h), Vacuum valve chamber (a) and pressure relief valve chamber (f); one end of the oil and gas port (e) is connected to the external oil tank through a pipeline, and the other end is connected and communicated with one end of the pressure relief valve chamber (f), and the pressure relief valve chamber (f) The other end is open and fixedly connected to the valve body (1) through the second spring base (8) at the opening; one end of the canister port (h) is open and connected to the external canister through the connecting pipe (11). The other end of the port (h) is connected to one end of the vacuum valve chamber (a), the other end of the vacuum valve chamber (a) is open and fixedly connected to the valve body (1) through the first spring base (15), and the side of the oil and gas port (e) The wall is connected and communicated with the side wall of the vacuum valve chamber (a) through the first communication hole (d), and is connected and communicated with the second communication hole (k) between the side wall of the carbon tank port (h) and the pressure relief valve chamber (f). ); the vacuum valve chamber (a) is provided with a vacuum valve (12) and a first spring (13), and the vacuum valve (12) is located One end of the spring (13) is pressed against the vacuum valve (12), and the other end is pressed against the first spring base (15); a slow pressure valve core (4), a push piece ( 2), bracket (3), spring top seat (6) and second spring (7), second spring (7) is located between second spring base (8) and spring top seat (6), bracket (3 ) is fixed between the pressure relief valve core (4) and the spring top seat (6), the pressure relief valve core (4) and the push piece (2) are located inside the bracket (3), and one end of the pressure relief valve core (4) The spring top seat (6) is fixedly connected, and the other end is pressed against the push piece (2). There is an air outlet square groove (m) on the side wall of the bracket (3); when the internal pressure of the fuel tank exceeds the limit value, the push piece (2) Break away from the communication port between the oil-gas port (e) and the pressure-relief valve chamber (f), and the oil-gas port (e) communicates with the pressure-relief valve chamber (f) through the air outlet square groove (m); when the push piece (2) Close the communication port between the oil and gas port (e) and the pressure relief valve chamber (f), the gas outlet square groove (m) is not connected to the oil and gas port (e); the vacuum valve chamber (a) and the carbon The tank opening (h) is located at the upper section of the valve body (1), the pressure relief valve chamber (f) is located at the lower section of the valve body (1), and the oil and gas passage is between the pressure relief valve chamber (f) and the vacuum valve chamber (a). Port (e), the central axis of the vacuum valve chamber (a) and the canister port (h) are horizontal and collinear, the pressure relief valve chamber (f), the first communication hole (d) and the second communication hole (k) The central axes of are all vertical; When the pressure in the fuel tank is lower than 0.098MPa, the vacuum valve (12) is opened, the vacuum valve chamber (a) communicates with the canister port (h), the first communication hole (d) communicates with the oil-gas port (e), and the external Air enters the fuel tank to realize the function of the vacuum valve; when the pressure in the fuel tank exceeds 0.11MPa, the second spring (7) under the action of the pressure difference between the inside and outside and the gravity of the push piece (2) and the pressure relief valve core (4), and The bracket (3), the pressure relief valve core (4) and the push piece (2) move downward together, the oil and gas enter the pressure relief valve chamber (f), and the oil and gas in the fuel tank pass through the second communication hole (k) and the carbon tank. Port (h) is discharged into the carbon tank to realize the function of the pressure relief valve. 2. A vacuum pressure relief valve for a vehicle-mounted oil and gas recovery device according to claim 1, characterized in that: a pressure relief valve is provided at the communication port between the oil and gas port (e) and the pressure relief valve chamber (f). The air outlet cylinder (y) protruding inside the chamber (f), the air outlet cylinder (y) is set in the center hole of the bracket (3) with gaps, and the air outlet square groove (m) is arranged on the upper section of the bracket (3). When the push piece (2) is pressed against the air outlet cylinder (y), the bottom of the air outlet square groove (m) is higher than the top surface of the push piece (2). 3. A vacuum relief valve for vehicle-mounted oil and gas recovery device according to claim 1, characterized in that: the first spring base (15) has a cylindrical boss (b) protruding into the vacuum valve chamber (a) ), the first spring (13) is set on the cylindrical boss (b), the vacuum valve (12) is a stepped shaft, and the center of the cylindrical boss (b) has a clearance fit with the small diameter shaft of the vacuum valve (12) blind hole (c). 4. A vacuum pressure relief valve for a vehicle-mounted oil and gas recovery device according to claim 1, characterized in that: the outer diameter of the push piece (2) is larger than that between the oil and gas port (e) and the pressure relief valve chamber (f) The inner diameter of the connecting port.