Foam-free self-sealing refueling gun

Abstract

The present invention provides a foam-free self-sealing refueling gun, which is equipped with a main valve, a self-sealing mechanism, a gun body, a handle assembly, an oil outlet pipe fitting, an auxiliary valve, a negative pressure pipe and other components. The main valve, the self-sealing mechanism and the auxiliary valve are all arranged in the gun body, the negative pressure pipe is arranged in the oil outlet pipe fitting, and the oil outlet pipe fitting is arranged at the front end of the gun body. A connecting pipeline is arranged between the oil outlet pipe fitting and the gun body, and the connecting pipeline connecting the gun body and the oil outlet pipe fitting is connected with the negative pressure pipe. The present invention provides a connecting pipeline that conducts the internal chambers of the gun body and the oil outlet pipe fitting on the connecting structure between the gun body and the oil outlet pipe fitting, fully utilizing the pressure balancing effect and structural characteristics of the connecting pipeline, effectively reducing the amount of oil foam generated inside the refueling gun during the refueling process, and achieving foam-free refueling as much as possible.

Description

Technical Field

[0001] The invention relates to the technical field of refueling equipment, and in particular to a self-sealing refueling gun capable of realizing foam-free refueling. Background Art

[0002] The refueling gun is the terminal of the refueling machine in the gas station, that is, the part that contacts the car's fuel tank. Self-sealing refueling is a commonly used type at present. The refueling gun includes a handle assembly, a gun body and an oil outlet pipe. The gun body and the oil outlet pipe are connected through an adapter sleeve. The main valve and self-sealing mechanism are set in the gun body to control the passage of oil. The auxiliary valve is set at the connection between the gun body and the oil outlet pipe to control the outlet of the oil.

[0003] After the oil gun is started, the oil gun handle assembly is opened, and the oil passes through the main valve hole, the venturi, the auxiliary valve and the oil outlet pipe. When refueling, the oil flows through the venturi quickly, forming a low-pressure area in the sealing cavity between the venturi and the auxiliary valve seat. The low-pressure area passes through a negative pressure pipe to the air nozzle at the front end of the gun barrel, and the other way directly reaches the self-sealing mechanism. Once the oil (or the foam of the oil) floods the negative pressure pipe, the self-sealing mechanism will close the oil gun and stop supplying oil.

[0004] Therefore, during the refueling process, if too much oil foam is generated during the oil transportation process, it is easy to cause the refueling gun to jump frequently, affecting the refueling process.

[0005] Based on this, this application is filed. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a foam-free self-sealing refueling gun, which solves the current problem of easy foaming in the self-sealing refueling gun in the prior art, minimizes the oil foam generated during the transportation process, and avoids excessive impact on the refueling process.

[0007] To achieve the above purpose, the foam-free self-sealing fueling gun of the present invention has the following structure:

[0008] The main valve is opened by the valve stem inside it to allow the fuel oil to flow;

[0009] A self-sealing mechanism, for releasing the engagement between the valve seat and the valve opening stem of the main valve to stop refueling when the liquid level in the refueling tank is sealed;

[0010] A gun body, comprising the main valve and the self-sealing mechanism;

[0011] A handle assembly is used to control the valve stem and the self-sealing mechanism to open;

[0012] An oil outlet pipe is arranged at the front end of the gun body and is used to connect the oil tank to be refueled and the gun body;

[0013] A negative pressure pipe is arranged in the oil outlet pipe member to connect the self-sealing mechanism with the oil tank to be refueled;

[0014] A secondary valve, disposed between the oil outlet pipe and the gun body, to control the flow of fuel oil;

[0015] A connecting pipeline is a connecting pipeline connecting the gun body and the oil outlet pipe fitting, and the connecting pipeline is connected with the negative pressure pipe.

[0016] Through the above technical solution, when the handle assembly controls the self-sealing mechanism and the main valve to open, the oil fills the main chamber of the gun body and pushes the sealing piston in the auxiliary valve to open, forcing the auxiliary valve to open and enter the oil outlet pipe. In this process, due to the existence of the connecting pipeline, part of the oil can be discharged through the connecting pipeline in advance and relieved first, thereby slowing down the oil flow rate at the moment of opening the auxiliary valve and during the opening process, avoiding the generation of oil foam in the oil outlet pipe due to high-speed oil discharge, which affects the oil output quality.

[0017] At the same time, since the connecting pipeline is connected to the negative pressure pipe, during the refueling process, the suction generated by the flow of oil in the connecting pipeline will also generate a certain negative pressure, thereby strengthening the negative pressure in the low-pressure area of ​​the self-sealing mechanism and the negative pressure pipe. In this way, when the negative pressure pipe comes into contact with the foam on the surface of the oil in the fuel tank being refueled, the negative pressure suction is sufficient to eliminate the foam, prevent the refueling gun from "jumping when encountering bubbles", and avoid frequent jumping of the gun.

[0018] The present invention is further configured as follows: the diameter of the connecting pipeline does not exceed 1 mm, which can prevent oil leakage through the connecting pipeline when the main valve and the auxiliary valve are both in the closed state while maintaining the "micro-conduction" state of the gun body and the oil outlet pipe.

[0019] The present invention is further configured as follows: the connecting pipeline has a certain length in the gun body, which prolongs the speed of the oil flowing out through the connecting pipeline, and prevents the oil from mixing with the air at the end of the convex pipe to produce foam, thereby further reducing the generation of oil foam. Secondly, the existence of the connecting pipeline alleviates the mutual squeezing effect of the oil in the oil outlet pipe, thereby reducing the generation of oil foam. To ensure the above effect, the length range is not less than 5mm, and considering the convenience of actual installation and processing, 1cm~5cm is appropriate.

[0020] The present invention is further configured as follows: the connecting pipes have consistent diameters, which is convenient for processing on the one hand, and is also conducive to achieving connection under small or micro pipe diameters on the other hand.

[0021] The present invention is further configured as follows: the connecting pipeline is arranged on the adapter sleeve between the oil outlet pipe and the gun body; for this, the adapter sleeve is provided with an axially arranged convex pipe on one side facing the oil outlet pipe and / or the gun body, and the connecting pipeline is arranged in the convex pipe. The above technical solution has a simple structure, is easy to implement, and is also easy to maintain.

[0022] The present invention is further configured as follows: the connecting portion between the convex tube and the adapter sleeve is thickened. The thickened design can, on the one hand, enhance the structural strength of the convex tube and prevent it from breaking; on the other hand, the thickened portion can be used to set a spring or open a passage, thus killing two birds with one stone.

[0023] The present invention further provides as follows: a conducting hole is provided on the sealing piston of the auxiliary valve, the conducting hole is communicated with the connecting pipeline or the connecting pipeline passes through the conducting hole and is communicated with the gun body. The above technical solution has a simple structure, is easy to implement and maintain, and has a good effect.

[0024] The present invention is further configured as follows: the communicating pipeline passes through the conducting hole; preferably, the length of the communicating pipeline passing through the sealing piston of the auxiliary valve is not less than 0.2 mm.

[0025] The above technical solution is easier to assemble. Secondly, the sealing piston can also move with the convex tube as the axis, which limits the path of the sealing piston and improves the performance of the auxiliary valve. Thirdly, it further ensures that both sides are in a good conduction state, which is conducive to maintaining pressure balance and reducing the generation of oil foam.

[0026] The present invention is further configured as follows: an inclined hole is provided in the adapter sleeve, one end of the inclined hole is connected to the connecting pipe, and the other end thereof opens on the outer wall of the adapter sleeve; one end of the negative pressure tube self-sealing mechanism is connected to the inclined hole.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention provides a connecting pipe connecting the internal chambers of the gun body and the oil outlet pipe member on the connecting structure between the two, making full use of the pressure balancing effect and structural characteristics of the connecting pipe, effectively reducing the amount of oil foam generated inside the refueling gun during the refueling process, and achieving foam-free refueling as much as possible.

[0029] Second, the connecting pipeline of the present invention has a simple structure and an ingenious design, which is convenient for processing, assembly, maintenance and inspection, and is suitable for practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of a specific embodiment of the present invention.

[0031] Figure 2 It is a partially enlarged schematic diagram of a specific embodiment of the present invention.

[0032] Figure numerals: 1—oil outlet pipe, 2—leather case, 3—gun body, 4—self-sealing mechanism, 5—main valve, 6—rivet, 7—gun stock, 8—gear rivet, 9—gear, 10—handle assembly, 11—connecting pin, 12—internal tooth elastic retaining ring, 13—pan head screw, 14—external tooth elastic retaining ring, 15—negative pressure pipe, 16—adapter sleeve;

[0033] 101—oil outlet chamber, 301—oil passage chamber, 1600—connecting pipeline, 1601—convex pipe 1, 1602—convex pipe 2, 1603—inclined hole, 1601a—convex stopper, 1701—valve seat, 1702—sealing piston, 1703—spring. DETAILED DESCRIPTION

[0034] The present invention provides a foam-free self-sealing refueling gun, which is provided with a gun body 3, an oil outlet pipe 1 and a handle assembly 10. The oil outlet pipe 1 is arranged at the front end of the gun body 3 and the two are connected by an adapter sleeve 16. The gun body 3 is equipped with a main valve 5, an auxiliary valve and a self-sealing mechanism 4 and other components, and the handle assembly 10 is linked with the control components of the main valve 5 and the self-sealing mechanism 4, namely, a valve opening rod and a self-control rod, to control the circulation of oil. When refueling, the handle is pulled, and the valve opening rod and the self-control rod are driven by force to drive the seal to separate from the valve seat, so as to realize the valve opening conduction. The oil enters the oil chamber 301, pushes the one-way valve plug that can be automatically reset, namely, the sealing piston 1702 of the auxiliary valve, and enters the oil outlet pipe 1 through the valve seat 1701 of the auxiliary valve. In this process, the high-speed and high-pressure oil will be mixed with air when passing through the oil chamber 301 and the valve seat 1701 of the auxiliary valve, and the added oil contains air bubbles, which is the so-called refueling with bubbles.

[0035] The present invention designs a connecting pipe 1600 between the oil passage chamber 301 and the oil outlet chamber 101 to connect the two. When the oil enters the oil passage chamber 301, the gas in the oil passage chamber 301 is squeezed out through the connecting pipe 1600, thereby preventing the oil from mixing with the air to form foam. In addition, when the oil enters the oil outlet pipe 1 through the auxiliary valve, a small amount of oil can flow out through the connecting pipe 1600, thereby reducing the excessive flow rate and pressure of the oil when passing through the valve seat 1701 of the auxiliary valve, and achieving less foam or even no foam refueling.

[0036] The structure is described in detail below in conjunction with the embodiments.

[0037] Embodiment 1 This embodiment provides a foam-free self-sealing refueling gun, which has:

[0038] The gun body 3 has a main valve 5 and a self-sealing mechanism 4. The main valve 5 is located at the oil inlet passage at the rear side of the gun body 3 for communicating with the fuel dispenser. The self-sealing mechanism 4 is arranged in the oil passage chamber 301 in the middle of the gun body 3.

[0039] A handle assembly 10, used to control the main valve 5 and the self-sealing mechanism 4 to open;

[0040] And the oil outlet pipe fitting 1, the oil outlet pipe fitting 1 is located at the front side of the gun body 3, and is sealedly connected to the gun body 3 through an adapter sleeve 16, and is used to connect the oil tank to be refueled and the gun body 3. In order to prevent the oil in the oil chamber 301 in the gun body 3 from flowing out after the main valve 5 is closed, a secondary valve can be set there.

[0041] Among them, the main valve 5 includes a seal with a movable seal, a valve seat 1701, a spring 1703 and a valve opening rod. The spring 1703 is installed between the seal and the inner wall of the gun body 3, and is used to make the seal always contact with the valve seat 1701. One end of the valve opening rod is reversely fixed with the seal to achieve linkage, and the other end extends to the outside to be linked with the handle assembly 10. The handle assembly 10 can be used to control the movement of the valve opening rod to separate the seal from the valve seat 1701 and allow the fuel oil to flow.

[0042] Among them, the self-sealing mechanism 4 is used to seal the liquid level in the refueled oil tank, and includes a spring 1703, a steel ball, a self-control rod, a diaphragm and other components. The self-control rod and the handle assembly 10 are linked through a connecting pin shaft 11, an internal gear elastic retaining ring 12, etc., to release the engagement state of the seal of the main valve 5 and the valve opening stem when the pressure is unbalanced to stop refueling.

[0043] Among them, a negative pressure pipe 15 is provided in the oil outlet pipe 1, one end of the negative pressure pipe 15 is arranged on the front end of the oil outlet pipe 1, and the other end extends into the inside of the adapter sleeve 16. There is a gap between the outer wall of the adapter sleeve 16 and the inner wall of the gun body 3, and the gap is connected to the air pressure chamber of the self-sealing mechanism 4 through a channel. Therefore, the self-sealing mechanism 4 is triggered to act as soon as the oil in the oil tank is filled.

[0044] The auxiliary valve includes a valve seat 1701 fixedly arranged in the gun body 3 to block the oil chamber 301 and the front end of the gun body 3 , and a sealing piston 1702 and a spring 1703 that drives the sealing piston 1702 to contact the valve seat 1701 are movably matched with the valve seat 1701 .

[0045] like Figure 2As shown, in this embodiment, the adapter sleeve 16 is coaxially arranged with the auxiliary valve and the two are adjacent, one end of the adapter sleeve 16 is opposite to the auxiliary valve, and the other end is opposite to the oil outlet pipe 1. In order to overcome the problem of internal foaming of the refueling gun during refueling, this embodiment is provided with a connecting pipe 1600 in the valve seat 1701 of the adapter sleeve 16 and the auxiliary valve: the adapter sleeve 16 is provided with a convex pipe 1601 and a convex pipe 2 1602 on both side end surfaces facing the auxiliary valve and the oil outlet pipe 1, and the convex pipe 1 1601 and the convex pipe 2 1602 are arranged along the axial direction of the adapter sleeve 16, and the convex pipe 1 1601 and the convex pipe 2 1602 are provided with axial through holes and the through holes are connected to each other; for ease of processing, the diameter of the connecting pipe 1600 is preferably kept uniform. Of course, in order to avoid oil leakage, the diameter of the connecting pipe 1600 does not exceed 1mm.

[0046] A coaxial conducting hole is provided in the valve seat 1701 of the auxiliary valve, and the caliber of the conducting hole is adapted to the outer diameter of the second convex tube 1602, so that the second convex tube 1602 can be inserted into the conducting hole and pass through the outer side of the auxiliary valve to the oil chamber 301. Preferably, the length of the connecting line 1600 passing through the sealing piston 1702 of the auxiliary valve is not less than 0.2 mm. One end of the spring 1703 in the auxiliary valve is sleeved on the outer periphery of the second convex tube 1602, and the other end is against the sealing piston 1702. For this purpose, a sinking groove structure or a convex stop structure can be provided on the end surface of the adapter sleeve 16 facing the auxiliary valve to sleeve and fix the spring 1703.

[0047] The oil passage chamber 301 and the oil outlet chamber 101 are connected by the connecting pipe 1600, so that the chambers on both sides of the auxiliary valve can be ventilated and oiled through the connecting pipe 1600 formed by the through holes in the convex pipe 1 1601 and the convex pipe 2 1602. Therefore, during the refueling process, the oil foam generated inside the refueling gun can be effectively reduced, and the quality and effect of refueling can be improved.

[0048] In addition, in other embodiments, in order to further enhance the foam-free or even low-foam refueling effect, the portion of the connecting pipe 1600 and the gun body 3, namely the convex pipe 1601, can be formed to a certain length, and the length range is not less than 5 mm, preferably 1 cm to 5 cm.

[0049] Example 2 In this embodiment, since the negative pressure tube 15 extends into the adapter sleeve 16 and is connected to the adapter sleeve 16, the inclined hole 1603 opened on the adapter sleeve 16 connects the other end opening of the negative pressure tube 15 with the gap between the outer wall of the adapter sleeve 16 and the inner wall of the oil outlet pipe 1 or the gun body 3, and finally the negative pressure tube 15 is connected to the chamber in the self-sealing mechanism 4 through the air intake channel in the cavity, thereby realizing the connection between the self-sealing mechanism 4 and the refueled oil tank.

[0050] The difference between this embodiment and embodiment 1 is that the above-mentioned inclined hole 1603 is also connected to the through holes in the convex tube 1 1601 and the convex tube 2 1602 , that is, the inclined hole 1603 is connected to the connecting pipeline 1600 and the negative pressure tube 15 at the same time.

[0051] Embodiment 3 The difference between this embodiment and the above-mentioned embodiment is that the connection part of the convex tube 1 1601 and the convex tube 2 1602 with the adapter sleeve 16 is thickened to form a convex stop. Figure 2 As shown, a convex stopper 1601a is provided at one end of the convex tube 1601 close to the adapter sleeve 16 and at the connection with the adapter sleeve 16. Correspondingly, if a convex stopper 2 is provided at one end of the convex tube close to the adapter sleeve 16 and at the connection with the adapter sleeve 16, the convex stopper 1601a can strengthen the connection strength between the convex tube 1601 and the adapter sleeve 16, prevent the convex tube 1601 from breaking suddenly during transportation and assembly, and extend the service life of the product. The spring 1703 can be sleeved on the outer wall of the convex stopper 2, reducing the corresponding structure provided for fixing the spring 1703 and simplifying the structural design.

[0052] Example 4 The difference between this example and the above examples lies in the difference in the matching relationship between the convex tube 1602 and the conducting hole on the sealing piston 1702 of the auxiliary valve: in this example, one end of the convex tube 1602 facing the sealing piston 1702 is plugged into the conducting hole, and at the same time, the end of the convex tube 1602 does not pass through the sealing piston 1702.

[0053] Embodiment 5 The difference between this embodiment and the above embodiment is that the matching relationship between the second protruding tube 1602 and the conducting hole on the sealing piston 1702 of the auxiliary valve is different: in this embodiment, the end of the second protruding tube 1602 facing the sealing piston 1702 is arranged opposite to the conducting hole, that is, the opening of the connecting pipeline 1600 on this side is connected to the conducting hole. However, compared with the above embodiment in which the second protruding tube 1602 is inserted into the conducting hole, the processing technology and assembly accuracy of the second protruding tube 1602 are required to be higher, otherwise there is a defect of easy oil leakage.

[0054] In summary, this embodiment provides a connecting pipe 1600 connecting the oil chamber 301 and the oil outlet chamber 101 to achieve interconnection and balance between the two chambers, effectively reduce the generation of foam during refueling, and improve the refueling quality.

Claims

1. A foam-free self-sealing refueling gun, characterized by: have: The main valve is opened by the valve stem inside it to allow the fuel oil to flow; A self-sealing mechanism, for releasing the engagement between the valve seat and the valve opening stem of the main valve to stop refueling when the liquid level in the refueling tank is sealed; A gun body, comprising the main valve and the self-sealing mechanism; A handle assembly is used to control the valve stem and the self-sealing mechanism to open; An oil outlet pipe is arranged at the front end of the gun body and is used to connect the oil tank to be refueled and the gun body; A negative pressure pipe is arranged in the oil outlet pipe member to connect the self-sealing mechanism with the oil tank to be refueled; A secondary valve, disposed between the oil outlet pipe and the gun body, to control the flow of fuel oil; A connecting pipeline, connecting the gun body and the oil outlet pipe, the connecting pipeline being connected with the negative pressure pipe; The connecting pipeline is arranged on the adapter sleeve between the oil outlet pipe fitting and the gun body; in this regard, the adapter sleeve faces the oil outlet pipe fitting, and an axially arranged convex pipe is provided on one side of the gun body, and the connecting pipeline is arranged in the convex pipe; a through hole is provided on the sealing piston of the auxiliary valve, and the connecting pipeline penetrates the through hole and is connected with the gun body; the diameter of the connecting pipeline does not exceed 1mm; the connecting pipeline connects the oil chamber and the oil outlet chamber.

2. The foam-free self-sealing refueling gun according to claim 1, characterized in that: The connecting pipe has a certain length in the gun body, and the length range is not less than 5 mm.

3. The foam-free self-sealing refueling gun according to claim 2, characterized in that: The length is 1cm~5cm.

4. The foam-free self-sealing refueling gun according to claim 1, characterized in that: The communicating pipes have the same diameter.

5. The foam-free self-sealing refueling gun according to claim 1, characterized in that: The connection portion between the convex tube and the adapter sleeve is designed to be thickened.

6. The foam-free self-sealing refueling gun according to claim 1, characterized in that: The communicating pipeline passes through the conducting hole; the length of the communicating pipeline passing through the sealing piston of the auxiliary valve is not less than 0.2 mm.

7. The foam-free self-sealing refueling gun according to claim 1, characterized in that: An inclined hole is arranged in the adapter sleeve, one end of the inclined hole is communicated with the connecting pipe, and the other end of the inclined hole opens on the outer wall of the adapter sleeve.

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