Foamless self-sealing oil gun with low-speed self-sealing function

Abstract

The utility model relates to a bubble -free self -sealing oil gun with low -speed self -sealing function belongs to the technical field of oiling machine accessories, including gun body, main valve, self -sealing mechanism, auxiliary valve, gun barrel, negative pressure balance pipe, handle assembly, and the gun barrel is connected with the gun body through the gun barrel joint, its characterized by: the venturi pipe with the conical inner hole is arranged in the gun barrel joint center hole, and the communication hole is arranged between the gun barrel joint center hole of the venturi pipe export end and the negative pressure cavity, and the negative pressure balance pipe communicates with the communication hole, at low flow rate, improve the flow rate of venturi pipe export, improve the negative pressure in the communication hole of venturi pipe export end, at high flow rate, fluid first passes through venturi pipe and releases, and the flow rate of main flow channel is greatly reduced, and the vacuum degree of negative pressure cavity is reduced, has the advantages such as good self -sealing performance, high oiling precision.

Description

Technical Field

[0001] This utility model relates to a refueling nozzle, and more particularly to a foam-free self-sealing refueling nozzle with a low-speed self-sealing function. Background Technology

[0002] Currently, large-diameter self-sealing diesel fuel nozzles at gas stations generally employ a tapered secondary valve core and secondary valve seat installed on the main flow channel. The vacuum generated by the diesel flow is used to meet the self-sealing requirements of the nozzle. Existing products generate a vacuum of 0.02-0.09 MPa at a flow rate of 20-120 L / min. The minimum vacuum generated within this flow rate range can meet the self-sealing requirements of the nozzle. However, when the flow rate is below 20L / min, the vacuum generated is less than 0.02MPa, which cannot meet the self-sealing vacuum requirement of the fuel nozzle. This results in the fuel nozzle not automatically shutting off when the fuel tank is full, causing diesel fuel to overflow, resulting in economic losses and environmental pollution. At high flow rates, the vacuum is greater, and a larger amount of air is drawn back through the self-sealing port. This air mixes with the diesel fuel and enters the fuel tank, resulting in a high gas content in the diesel fuel. This causes a lot of foam to form on the surface of the diesel fuel in the tank. Once the foam blocks the self-sealing port, it will cause the fuel nozzle to shut off prematurely. If the refueling personnel want to fill the fuel tank to the preset capacity, they need to pull the fuel nozzle out of the car's fuel tank and manually fill the tank with diesel fuel, thereby reducing refueling efficiency and increasing safety hazards. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a foam-free self-sealing oil gun with low-speed self-sealing function that can improve the vacuum level at low flow rates, reduce the vacuum level at high flow rates, and has good self-sealing performance and high safety.

[0004] The technical solution for realizing this utility model is as follows: A foam-free self-sealing oil gun with low-speed self-sealing function includes a gun body, a main valve, a self-sealing mechanism, a secondary valve, a barrel, a negative pressure balance tube, and a handle assembly. The main valve, self-sealing mechanism, and secondary valve are housed within the gun body. One end of the barrel is mounted on the gun body at the outlet of the secondary valve via a barrel connector, and the other end has a self-sealing port on its side wall. The negative pressure balance tube is installed between the barrel connector and the self-sealing port. The barrel connector has a central hole and several axial flow windows distributed around the outer periphery of the central hole. A negative pressure chamber is located between the outlet of the secondary valve seat and the barrel connector. One path of this negative pressure chamber is connected to the control chamber of the self-sealing mechanism through a through hole, and the other path is connected to the control chamber of the self-sealing mechanism through a negative pressure balance tube. The pressure balance tube is connected to the self-sealing port; the handle assembly includes a handle and a top plate, one end of the handle is hinged to the control rod of the self-sealing mechanism, and the other end forms a stop mechanism with the guard handle inside the gun body, and the middle part contacts the top rod of the main valve; its characteristic is that: a venturi tube with a conical inner hole is provided in the central hole of the gun barrel connector, the large diameter end of the conical inner hole of the venturi tube is the inlet end, installed in the direction of fluid inlet and connected to the central through hole of the secondary valve disc, and the small diameter end is the outlet end, installed in the direction of fluid outlet, and a connecting hole is provided between the central hole of the gun barrel connector at the outlet end of the venturi tube and the negative pressure chamber, and the negative pressure balance tube is connected to the connecting hole.

[0005] The preferred arrangement is that the connecting hole is inclined from the outlet end of the venturi tube towards the inlet end.

[0006] The advantages of this utility model compared with the prior art are: 1. A venturi tube with a conical inner bore is installed in the center hole of the gun barrel connector. Because the diameter of the venturi tube throat is very small, the flow velocity at the throat of the venturi tube is also relatively high when the flow rate of the oil gun is very low (the throat diameter is inversely proportional to the throat flow velocity, and the throat flow velocity is directly proportional to the vacuum degree). This can improve the vacuum degree at the outlet end of the venturi tube. When the flow rate of the oil gun is high, the venturi tube will not generate a large vacuum degree because the auxiliary valve relieves most of the pressure. Through the reasonable design of the venturi tube taper, the vacuum degree that meets the self-sealing suction force is ensured at low flow rates, so that the self-sealing mechanism can operate reliably.

[0007] 2. The Venturi tube and main flow channel are separated. At high flow rates, most of the fluid is output through the secondary valve, and a small amount flows through the Venturi tube. This generates low negative pressure and reduces disturbance to the fluid, thereby reducing foam generation, preventing premature self-sealing of the oil gun, improving refueling efficiency and reducing safety hazards. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] Figure 2 This is a utility model Figure 1 A partial structural diagram of the intermediate valve and gun barrel section.

[0010] In the diagram: 1. Gun body, 2. Main valve, 3. Main valve cover, 4. Main valve spring, 5. Pressureless self-sealing channel, 6. Pressureless self-sealing spring, 7. Steel ball, 8. Self-sealing membrane assembly, 9. Pressureless self-sealing cover, 10. Self-sealing core, 11. Through hole, 12. Secondary valve seat, 13. Secondary valve disc, 14. Secondary valve spring, 15. Venturi tube, 16. Gun barrel connector, 17. Gun barrel, 18. Self-sealing port, 19. Negative pressure balance tube, 20. Guide tube, 21. Connecting hole, 22. Negative pressure chamber, 23. Control rod, 24. Control chamber, 25. Push rod, 26. Handle, 27. Handguard, 28. Center hole. Detailed Implementation

[0011] like Figure 1 The foam-free self-sealing oil gun with low-speed self-sealing function shown includes a gun body 1, a main valve 2, a self-sealing mechanism, a secondary valve, a barrel 17, a negative pressure balance tube 19, and a handle assembly. The main valve 2, the self-sealing mechanism, and the secondary valve are disposed inside the gun body 1. One end of the barrel 17 is mounted on the gun body 1 at the outlet of the secondary valve via a barrel connector 16, and the other end has a self-sealing port 18 on its side wall. The negative pressure balance tube 19 is installed between the barrel connector 16 and the self-sealing port 18. The barrel connector 16 has a central hole 28 and several axial flow windows distributed around the central hole 28. When the secondary valve is opened, fluid flows through the axial flow windows to form the main flow channel. A negative pressure chamber 22 is located between the outlet of the secondary valve seat 12 and the barrel connector 16. This negative pressure chamber 22 is connected to the control chamber 24 and the self-sealing port 18 via a through hole 11 and the negative pressure balance tube 19, respectively. The handle assembly includes a handle 26, a guard 27, and a top plate. One end of the handle 26 is hinged to the lower end of the control rod 23 of the self-sealing mechanism, and the other end forms a stop mechanism with the guard 27 inside the gun body 1. The middle part contacts the top rod 25 of the main valve 2. The upper end of the control rod 23 is controlled by the self-sealing membrane assembly 8 through the self-sealing core 10 and the steel ball 7. Its characteristic is that a venturi tube 15 with a conical inner hole is provided in the central hole 28 of the barrel connector 16. The large diameter end of the conical inner hole of the venturi tube 15 is the fluid inlet end, which is installed in the direction of fluid inlet and is connected to the central through hole of the secondary valve disc 13. The small diameter end is the outlet end, which is installed in the direction of fluid outlet. A connecting hole 21 is provided between the central hole 28 of the barrel connector 16 at the outlet end of the venturi tube 15 and the negative pressure chamber 22. The negative pressure balance tube 19 is connected to the connecting hole 21. At low flow rates, the fluid increases its velocity and vacuum level in the connecting hole 21 and negative pressure chamber 22 when passing through the venturi tube 15 from the central through hole of the secondary valve disc 13. Through the reasonable design of the venturi tube taper, the vacuum level reaches 0.02MPa at a flow rate of 3L / min, ensuring reliable self-sealing. At high flow rates, the fluid is first released through the venturi tube 15 to reduce the flow rate in the main channel and lower the vacuum level in the negative pressure chamber 22, preventing excessive back-drawing of air from mixing into the oil flow and generating foam in the oil tank. A guide tube 20 is installed in the central hole 28 of the gun barrel connector 16 at the outlet end of the venturi tube 15 to guide the flow through the venturi tube 15 to the middle of the gun barrel 17, reducing the impact of turbulence generated when the fluid at the outlet of the venturi tube 15 and the fluid in the main channel meet on the vacuum level in the negative pressure chamber 22.

[0012] The connecting hole 21 is inclined from the outlet end of the Venturi tube 15 towards the inlet end, so that the high-speed flow at the outlet of the Venturi tube 15 can more effectively generate a vacuum effect on the negative pressure chamber 22.

[0013] The main valve 2 includes a main valve disc, a main valve cover 3, a push rod 25, and a main valve spring 4. When the handle 26 is pulled up, the push rod 25 is lifted up, opening the main valve disc, and oil is added to the oil tank through the main valve 2.

[0014] The secondary valve includes a secondary valve seat 12, a secondary valve disc 13, and a secondary valve spring 14. When fluid passes through the secondary valve seat 12, a negative pressure is generated in the negative pressure chamber 22 at the outlet of the secondary valve seat 12, so that the negative pressure chamber 22 forms a vacuum chamber.

[0015] The self-sealing mechanism includes a self-sealing membrane assembly 8, a self-sealing core 10, and a control rod 23. The upper membrane cavity of the self-sealing membrane assembly 8 is connected to the negative pressure chamber 22 through a through hole 11. During the refueling process, the negative pressure chamber 22 draws in air through the negative pressure balance pipe 19 and the self-sealing port 18 to achieve pressure balance. When the oil tank is full, the self-sealing port 18 is blocked, and the negative pressure generated by the fluid enters the control chamber 24 above the self-sealing membrane assembly 8 through the through hole 11, controlling the self-sealing mechanism to reset the handle 26 and close the main valve 2, thus realizing the full-oil self-sealing function.

[0016] A pressureless self-sealing mechanism is set above the self-sealing mechanism. The pressureless self-sealing mechanism includes a pressureless self-sealing cover 9, a pressureless self-sealing spring 6, and a pressureless self-sealing diaphragm. A pressureless self-sealing cavity is formed between the pressureless self-sealing cover and the pressureless self-sealing diaphragm. The pressureless self-sealing cavity is connected to the inlet of the gun body 1 through a pressureless self-sealing channel 5. When there is no fluid pressure at the inlet of the gun body 1, the pressureless self-sealing mechanism controls the main valve 2 to close, thereby realizing the pressureless self-sealing function.

Claims

1. A foam-free self-sealing oil gun with low-speed self-sealing function, comprising a gun body (1), a main valve (2), a self-sealing mechanism, a secondary valve, a gun barrel (17), a negative pressure balance pipe (19), and a handle assembly; the main valve (2), the self-sealing mechanism, and the secondary valve are disposed inside the gun body (1); one end of the gun barrel (17) is installed on the gun body (1) at the outlet of the secondary valve through a gun barrel connector (16), and the other end has a self-sealing port (18) on its side wall; the negative pressure balance pipe (19) is installed between the gun barrel connector (16) and the self-sealing port (18); the gun barrel connector (16) has a central hole (28) and a nozzle distributed in the central hole (28). 28) Several axial flow windows on the outer periphery; a negative pressure chamber (22) is provided between the outlet of the secondary valve seat (12) and the barrel connector (16), the negative pressure chamber (22) is connected to the control chamber (24) through the through hole (11), and is connected to the self-sealing port (18) through the negative pressure balance pipe (19); the handle assembly includes a handle (26), a guard (27) and a top plate, one end of the handle (26) is hinged to the control rod (23) of the self-sealing mechanism, the other end is connected to the guard (27) inside the gun body (1) to form a stop mechanism, and the middle part is in contact with the top rod (25) of the main valve (2); its characteristics are: A venturi tube (15) with a conical inner hole is installed in the center hole (28) of the barrel connector (16). The large diameter end of the conical inner hole of the venturi tube (15) is the fluid inlet end, which is installed in the direction of fluid inlet and is connected to the center through hole of the secondary valve disc (13). The small diameter end is the outlet end, which is installed in the direction of fluid outlet. A connecting hole (21) is provided between the center hole (28) of the barrel connector (16) at the outlet end of the venturi tube (15) and the negative pressure chamber (22). The negative pressure balance tube (19) is connected to the connecting hole (21).

2. The foam-free self-sealing oil gun with low-speed self-sealing function according to claim 1, characterized in that: The connecting hole (21) is inclined from the outlet end of the venturi tube (15) towards the inlet end.

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