A multifunctional valve and a fuel tank oil and gas management system using the valve

Abstract

The present invention relates to a multifunctional valve with higher integration and capable of realizing multiple functions, and a fuel tank oil and gas management system using the valve. The multifunctional valve comprises a valve body, a valve cover, an oil control valve core and a breathing valve core, and the valve cover is connected with an exhaust interface and a breathing interface, and is characterized in that: the valve body has a communicating oil control valve cavity and a breathing valve cavity, the oil control valve core is located in the oil control valve cavity, and the breathing valve core is located in the breathing valve cavity. The multifunctional valve integrates the oil tank refueling check function, the flow management function and the oil tank tilting anti-leakage function, has a higher integration degree, is more convenient to install, and has a lower production cost.

Description

Technical Field

[0001] The invention relates to a multifunctional valve and an oil tank oil and gas management system using the multifunctional valve. Background Art

[0002] During the process of refueling and using the fuel in the automobile tank, if the tank is sealed, there will be a pressure difference between the inside and outside of the tank. Therefore, in order to smoothly refuel and use the fuel in the tank, ventilation treatment is required on the top of the tank. At the same time, it is necessary to prevent the fuel and oil vapor in the tank from leaking out, and the oil vapor needs to be recovered, so as to improve the fuel utilization rate while not polluting the environment. In order to achieve this goal, various valves need to be installed on the top of the tank. Generally, fuel is injected into the fuel tank from the fuel port of the car. An inlet check valve is set below the fuel port to prevent fuel from flowing from the fuel tank to the fuel filling port; a rollover air valve (ROV), a limited exhaust valve (FLVV), and a flow management valve are set on the top of the fuel tank; a carbon canister is set outside the fuel tank to recover oil vapor, and the exhaust function is performed during normal vehicle use or non-aggressive vehicle maneuvers; the steam hole of the limited exhaust valve is larger than that of the rollover air valve, and the fuel vapor flows to the carbon canister through the pipeline, so that the fuel vapor can be recovered, and at the same time, the fuel should be prevented from flowing out through the pipeline when the fuel tank is full; of course, the fuel should not leak out during violent maneuvers or vehicle rollovers; the main function of the flow management valve is to manage the flow direction of fuel vapor under different circumstances. The various valves on the above fuel tank are interconnected through a circulating oil pipe, with low integration, complex connecting pipes, inconvenient installation, and high cost. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention innovatively provides a multifunctional valve with higher integration and capable of realizing multiple functions, as well as a fuel tank oil and gas management system using the valve.

[0004] This multifunctional valve includes a valve body, a valve cover, an oil control valve core and a breathing valve core, and the valve cover is connected with an exhaust interface and a breathing interface, and is characterized in that: the valve body has a communicating oil control valve cavity and a breathing valve cavity, the oil control valve core is located in the oil control valve cavity, and the breathing valve core is located in the breathing valve cavity; a large exhaust hole is provided at the upper part of the oil control valve cavity, and the oil control valve core can block the large exhaust hole under the buoyancy of the fuel; a small exhaust hole is provided at the upper part of the breathing valve cavity, and the breathing valve core can block the small exhaust hole, and the position of the large exhaust hole is lower than the position of the small exhaust hole; an oil control air inlet and a breathing air inlet are provided on the valve body, and the position of the breathing air inlet is higher than the positions of the oil control air inlet and the large exhaust hole; an airflow seat is provided between the valve cover and the valve body, and a seal is formed between the airflow seat and the valve body The lower chamber, the large exhaust hole and the small exhaust hole are both communicated with the lower chamber, an upper chamber is formed between the airflow seat and the valve cover, an elastic sealing sheet is provided in the upper chamber, the elastic sealing sheet divides the upper chamber into an upper exhaust chamber and a lower exhaust chamber, a large through hole is provided in the middle of the airflow seat, the elastic sealing sheet is sealed with the upper edge of the large through hole of the airflow seat, when the elastic sealing sheet is lifted by the gas, the large through hole of the airflow seat can communicate the lower chamber with the lower exhaust chamber, and the exhaust interface is communicated with the lower exhaust chamber; an exhalation exhaust channel is provided on the airflow seat, the exhalation exhaust channel communicates the lower chamber with the lower exhaust chamber, a connecting sheet is connected to the middle of the elastic sealing sheet, a small hole is provided on the connecting sheet, the small hole of the connecting sheet communicates the upper exhaust chamber with the large through hole of the airflow seat, and the breathing interface is communicated with the upper exhaust chamber.

[0005] The lower chamber is provided with an anti-leakage cover, which covers the large exhaust hole and the small exhaust hole from above.

[0006] A plug is provided on the upper part of the anti-leakage cover, and when the anti-leakage cover moves upward, the plug can block the exhalation and exhaust passage of the airflow seat.

[0007] The oil control valve core has a tendency to move upward under the action of the oil control spring, and the breathing valve core has a tendency to move upward under the action of the breathing spring.

[0008] The bottom of the valve body is connected with an oil inlet pipe, and the oil inlet pipe is communicated with the breathing valve cavity.

[0009] The valve cover is connected with a connection interface, and the connection interface is communicated with the lower exhaust cavity.

[0010] A fuel tank oil and gas management system includes a fuel tank and a carbon canister, wherein the fuel tank is connected to a refueling pipe, and is characterized in that: the fuel tank is connected to a multifunctional valve as described above, the exhaust interface of the multifunctional valve is connected to the carbon canister through an exhaust pipeline, and the breathing interface of the multifunctional valve is connected to the refueling pipe through a breathing pipeline.

[0011] The upper end surface of the oil tank is connected with an air valve, and the air valve is connected with the connection interface through a connecting pipe.

[0012] A multifunctional valve provided by the present invention integrates a fuel tank refueling check function, a flow management function and a fuel tank tilting anti-leakage function, has a higher degree of integration, is more convenient to install and has a lower production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the fuel tank oil and gas management system;

[0014] Figure 2 is a three-dimensional diagram of a multifunctional valve;

[0015] Figure 3 is a side view of the multifunctional valve;

[0016] Figure 4 is a cross-sectional view of a multifunctional valve;

[0017] Figure 5 is a schematic diagram of an airflow seat and an elastic sealing sheet;

[0018] Figure 6 is a schematic diagram of an airflow seat and an anti-leakage cover;

[0019] Figure 7 This is the working principle diagram of the multi-function valve. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, this fuel tank oil and gas management system includes a fuel tank A and a carbon canister B, and a refueling pipe C is connected to the fuel tank A. The innovation of the present invention is that a multifunctional valve is connected to the fuel tank, and the exhaust interface 12 of the multifunctional valve is connected to the carbon canister B through an exhaust pipeline 13, and the breathing interface 10 of the multifunctional valve is connected to the refueling pipe C through a breathing pipeline 14. The multifunctional valve has a refueling check function, a flow management function, and a fuel tank tilting anti-leakage function.

[0021] The structure and working principle of the multifunctional valve are described in detail below.

[0022] like Figure 2 As shown, the multifunctional valve 2 and the oil storage tank 3 together constitute a fuel pump assembly (the oil storage tank 3 is provided with a fuel pump and a filter, which are prior arts). Figure 4 and Figure 7As shown, the multifunctional valve 2 comprises a valve body 20, a valve cover 1, an oil control valve core 22 and a breathing valve core 24. The valve cover 1 is connected with an exhaust interface 12 and a breathing interface 10. The valve body 20 has an oil control valve cavity 201 and a breathing valve cavity 202 that communicate with each other. The oil control valve core 22 is located in the oil control valve cavity 201, and the breathing valve core 24 is located in the breathing valve cavity 202. A large exhaust hole 21 is provided at the upper part of the oil control valve cavity 201. The oil control valve core 22 can block the large exhaust hole 21 under the buoyancy of the fuel (when the vehicle is refueling or driving normally, Most of the gas in the fuel tank flows through the large exhaust hole 21); a small exhaust hole 23 is provided on the upper part of the breathing valve chamber 202, and the breathing valve core 24 can block the small exhaust hole 23 (when the vehicle rolls over, the fuel or gravity can cause the breathing valve core 24 to block the small exhaust hole 23 to prevent the fuel from flowing into the carbon canister), and the position of the large exhaust hole 21 is lower than that of the small exhaust hole 23 (when the fuel tank A is filled with fuel, the oil control valve core 22 blocks the large exhaust hole 21, and the gas in the fuel tank flows through the small exhaust hole 23); Figure 7 As shown, the valve body 20 is provided with an oil control air inlet 206 communicating with the oil control valve cavity 201 (when refueling, the gas mainly flows through the oil control air inlet 206). Figure 3 and Figure 7 As shown, the valve body 20 is provided with a breathing air inlet 207 which is in communication with the breathing valve cavity 202 (when the oil is filled, the gas flows through the breathing air inlet 207 ), and the position of the breathing air inlet 207 is higher than the positions of the oil control air inlet 206 and the large exhaust hole 21 .

[0023] In order to control the flow direction and flow rate of gas in the fuel tank, Figure 4 As shown, the present invention has an airflow seat 25 between the valve cover 1 and the valve body 20, and the airflow seat 25 and the valve body 20 are sealed to form a lower chamber 203, and the large exhaust hole 21 and the small exhaust hole 23 are both connected to the lower chamber 203; and an upper chamber is formed between the airflow seat 25 and the valve cover 1, and an elastic sealing sheet 26 is provided in the upper chamber, and the elastic sealing sheet 26 divides the upper chamber into an upper exhaust chamber 205 and a lower exhaust chamber 204, as shown in FIG. Figure 6 As shown, a large through hole 252 is provided in the middle of the airflow seat 25. Figure 5 As shown, the elastic sealing sheet 26 is sealed with the upper edge of the large through hole 252 of the airflow seat 25. When the elastic sealing sheet 26 is lifted by the gas, the large through hole 252 of the airflow seat 25 can communicate the lower chamber 203 with the lower exhaust cavity 204, and the exhaust port 12 is communicated with the lower exhaust cavity 204, so that the gas is mainly discharged through the exhaust port 12; in addition, an exhalation exhaust channel 251 is provided on the airflow seat 25, as shown in FIG. Figure 7As shown, the exhalation exhaust channel 251 connects the lower chamber 203 with the lower exhaust cavity 204, the middle part of the elastic sealing sheet 26 is connected with a connecting sheet 260, and a small hole 261 is provided on the connecting sheet 260. The small hole 261 of the connecting sheet 260 connects the upper exhaust cavity 205 with the large through hole 252 of the airflow seat 25, and the breathing interface 10 is connected with the upper exhaust cavity 205.

[0024] The working principle of the multifunctional valve is as follows: Figure 7 As shown, when the vehicle is refueling normally, the fuel pushes the gas in the fuel tank to enter the lower chamber 203 mainly through the oil control air inlet 206. Since the gas flow is very large during refueling, the elastic sealing sheet 26 is lifted up by the gas at this time, and the large through hole 252 of the air flow seat 25 connects the lower chamber 203 with the lower exhaust chamber 204. Since the exhaust interface 12 is connected to the lower exhaust chamber 204, the gas is mainly discharged through the exhaust interface 12, and then enters the carbon canister B through the exhaust pipe 13; while refueling, the gas in the lower chamber 203 can also flow into the upper exhaust chamber 205 through the large through hole 252 of the air flow seat 25 and the small hole 261 of the connecting sheet 260. Since the breathing interface 10 is connected to the upper exhaust chamber 205, the gas will also flow into the breathing interface 10, and the gas will enter the refueling pipe C through the breathing pipe 14, so that a reflux is formed between the fuel tank A and the refueling pipe C, thereby reducing the load of the carbon canister, and correspondingly reducing the size of the carbon canister B, while also reducing the outside air entering the fuel tank A. When the fuel tank is filled with oil, the fuel enters the fuel control valve chamber 201 through the fuel control air inlet 206, and the fuel control valve core 22 blocks the large exhaust hole 21 under the buoyancy of the fuel. At this time, the main air path is cut off, and the gas in the fuel tank forms air pressure, so that the external fuel gun can no longer refuel. When the fuel tank A is full of fuel, due to the temperature, the fuel in the fuel tank is still in an evaporating state. At this time, the gas in the fuel tank enters the lower chamber 203 through the breathing air inlet 207 (because the breathing air inlet 207 is higher than the oil control air inlet 206 and the large exhaust hole 21, the fuel tank can be ventilated normally when it is full of fuel). The gas in the lower chamber 203 can flow to the exhaust interface 12 through the exhalation exhaust channel 251 of the airflow seat 25, and then enter the carbon canister B, or flow into the breathing interface 10 through the large through hole 252 of the airflow seat 25 and the small hole 261 of the connecting piece 260, so that the gas in the fuel tank A is always connected to the filling pipe C, so that the air pressure in the fuel tank A is always in a balanced state, ensuring the safety of the fuel tank A. When the vehicle has an accident and rolls over, causing the fuel tank to tilt or invert, the fuel or gravity can cause the oil control valve core 22 to block the large exhaust hole 21 and the breathing valve core 24 to block the small exhaust hole 23, thereby completely blocking the fuel from entering the lower chamber 203, thereby preventing the fuel from flowing into the carbon canister B.

[0025] When the vehicle rolls over, the fuel in the fuel tank A will splash, and the splashed fuel may flow into the carbon canister B through the large exhaust hole 21 and the small exhaust hole 23. In order to solve this problem, the present invention is provided with an anti-leakage cover 27 in the lower chamber 203, and the anti-leakage cover 27 covers the large exhaust hole 21 and the small exhaust hole 23 from above. When the vehicle rolls over, the splashed fuel will be blocked by the anti-leakage cover 27, effectively preventing the fuel from entering the carbon canister B.

[0026] Even if the splashed fuel is blocked by the anti-leakage cover 27, if the amount of fuel is large, it is still possible to enter the carbon canister B through the exhalation and exhaust passage 251 of the airflow seat 25. In order to prevent this from happening, the present invention provides a plug 270 on the upper part of the anti-leakage cover 27. When the vehicle rolls over, the anti-leakage cover 27 will move upward, so that the plug 270 on the anti-leakage cover 27 can block the exhalation and exhaust passage 251 of the airflow seat 25, thereby completely preventing the possibility of fuel entering the carbon canister B.

[0027] In order to make the oil control valve core 22 move upward more easily, the oil control valve core 22 of the present invention has a tendency to move upward under the action of the oil control spring 220, and the oil control spring 220 can give the oil control valve core 22 an upward force, so that the oil control valve core 22 can move upward more easily and faster, thereby ensuring that the oil control valve core 22 can block the large exhaust hole 21 in time to prevent the fuel from entering the carbon canister B when the vehicle rolls over. Similarly, in order to make the breathing valve core 24 move upward more easily, the breathing valve core 24 has a tendency to move upward under the action of the breathing spring 221.

[0028] like Figure 1 As shown, some fuel tanks A are made into different shapes to match the vehicle body, which may cause the fuel tank A to be uneven (such as Figure 1 A1 in the figure is the low position). When the vehicle rolls over or is parked unevenly, the high position in the fuel tank A may be filled with fuel, while the low position (A1) has air. In order to allow the fuel tank A to breathe normally in this case, a connection interface 11 is connected to the valve cover 1, and the connection interface 11 is communicated with the lower exhaust chamber 204. An air valve 4 is connected to the upper end surface of the low position (A1) of the fuel tank A, and the air valve 4 is connected to the connection interface 11 through a connecting pipe 15. When the low position (A1) of the fuel tank A is full of oil, the valve core of the air valve 4 is blocked under the buoyancy of the fuel; when the above situation occurs, the low position (A1) of the fuel tank A is filled with air, and the valve core is no longer blocked, so that the gas at the low position of the fuel tank A flows to the high position of the fuel tank A, thereby ensuring that this type of heterogeneous fuel tank can be exhausted normally even when it rolls over.

[0029] Finally, it is worth mentioning that in order to allow the fuel to quickly enter the valve body 20 and keep the liquid level in the valve body 20 always equal to the liquid level outside the valve body 20, the present invention is connected to the bottom of the valve body 20 with an oil inlet pipe 222, and the oil inlet pipe 222 is communicated with the breathing valve chamber 202. When the fuel gradually rises and falls, it first enters the breathing valve chamber 202 through the bottom oil inlet pipe 222. Since the breathing valve chamber 202 is communicated with the oil control valve chamber 201, the liquid level in the valve body 20 is always equal to the external liquid level of the valve body 20, and the gas above the fuel can also be discharged normally.

Claims

1. A multifunctional valve, comprising a valve body (20), a valve cover (1), an oil control valve core (22) and a breathing valve core (24), wherein the valve cover (1) is connected to an exhaust interface (12) and a breathing interface (10), characterized in that: The valve body (20) comprises an oil control valve chamber (201) and a breathing valve chamber (202) which are in communication with each other; the oil control valve core (22) is located in the oil control valve chamber (201), and the breathing valve core (24) is located in the breathing valve chamber (202); a large exhaust hole (21) is provided at the top of the oil control valve chamber (201), and the oil control valve core (22) can block the large exhaust hole (21) under the buoyancy of the fuel; a small exhaust hole (23) is provided at the top of the breathing valve chamber (202), and the breathing valve core (24) can block the small exhaust hole (23), and the large exhaust hole (21) is provided at the top of the breathing valve chamber (202). The position of the large-mouth exhaust hole (21) is lower than the position of the small-mouth exhaust hole (23); the valve body (20) is provided with an oil control air inlet (206) and a breathing air inlet (207), and the position of the breathing air inlet (207) is higher than the positions of the oil control air inlet (206) and the large-mouth exhaust hole (21); an air flow seat (25) is provided between the valve cover (1) and the valve body (20), and the air flow seat (25) and the valve body (20) are sealed to form a lower chamber (203), and the large-mouth exhaust hole (21) and the small-mouth exhaust hole (23) are both in communication with the lower chamber (203), and the air flow seat (25) is in communication with the lower chamber (203). ) and the valve cover (1) form an upper chamber, wherein an elastic sealing sheet (26) is provided in the upper chamber, wherein the elastic sealing sheet (26) divides the upper chamber into an upper exhaust chamber (205) and a lower exhaust chamber (204), wherein a large through hole (252) is provided in the middle of the airflow seat (25), wherein the elastic sealing sheet (26) is sealed with the upper edge of the large through hole (252) of the airflow seat (25), and when the elastic sealing sheet (26) is lifted by gas, the large through hole (252) of the airflow seat (25) can connect the lower chamber (203) with the lower exhaust chamber (204), wherein the exhaust interface ( 12) is communicated with the lower exhaust cavity (204); an exhalation exhaust channel (251) is provided on the airflow seat (25), and the exhalation exhaust channel (251) communicates the lower chamber (203) with the lower exhaust cavity (204); a connecting plate (260) is connected to the middle of the elastic sealing plate (26), and a small hole (261) is provided on the connecting plate (260), and the small hole (261) of the connecting plate (260) communicates the upper exhaust cavity (205) with the large through hole (252) of the airflow seat (25), and the breathing interface (10) is communicated with the upper exhaust cavity (205).

2. A multifunctional valve according to claim 1, characterized in that: An anti-leakage cover (27) is provided in the lower chamber (203), and the anti-leakage cover (27) covers the large exhaust hole (21) and the small exhaust hole (23) from above.

3. A multifunctional valve according to claim 2, characterized in that: A plug (270) is provided on the upper portion of the anti-leakage cover (27). When the anti-leakage cover (27) moves upward, the plug (270) can block the exhalation and exhaust passage (251) of the airflow seat (25).

4. A multifunctional valve according to claim 1, characterized in that: The oil control valve core (22) has a tendency to move upward under the action of the oil control spring (220), and the breathing valve core (24) has a tendency to move upward under the action of the breathing spring (221).

5. A multifunctional valve according to claim 1, characterized in that: The bottom of the valve body (20) is connected to an oil inlet pipe (222), and the oil inlet pipe (222) is in communication with the breathing valve cavity (202).

6. A multifunctional valve according to claim 1, characterized in that: The valve cover (1) is connected to a connection interface (11), and the connection interface (11) is in communication with the lower exhaust cavity (204).

7. A fuel tank oil and gas management system, comprising a fuel tank (A) and a carbon canister (B), wherein the fuel tank (A) is connected to a refueling pipe (C), characterized in that: The fuel tank (A) is connected to a multifunctional valve according to any one of claims 1 to 6, an exhaust port (12) of the multifunctional valve is connected to a carbon canister (B) via an exhaust pipe (13), and a breathing port (10) of the multifunctional valve is connected to a refueling pipe (C) via a breathing pipe (14).

8. The fuel tank oil vapor management system according to claim 7, characterized in that: An air valve (4) is connected to the upper end surface of the oil tank (A), and the air valve (4) is connected to the connection interface (11) via a connecting pipe (15).

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