A safety device for preventing liquid spraying when retracting the gun during filling of LNG gas dispenser

Abstract

The present invention discloses a safety device for preventing liquid spraying when retracting the gun during liquid filling of an LNG gas filling machine, which relates to the field of gas filling machines, and specifically comprises a liquid filling pipe for liquid filling and a sealing cylinder installed at the end of the liquid filling pipe to prevent natural gas from spraying out, wherein the sealing cylinder is slidably installed on the liquid filling pipe, a fixed cylinder is welded and fixed on the liquid filling pipe, the side of the fixed cylinder is fixedly connected to one end of a first spring sleeved on the liquid filling pipe, the other end of the first spring is fixedly connected to the side of the sealing cylinder, and a fixed limiting ring is integrally formed at one end of the liquid filling pipe located in the fixed cylinder. The present invention effectively prevents natural gas from spraying onto the body of a worker during liquid filling through the structural design of the sealing cylinder, and is safe to use.

Description

Technical Field

[0001] The invention relates to the field of gas dispensers, in particular to a safety device for preventing liquid spraying from a LNG gas dispenser used for liquid filling and gun withdrawal. Background Art

[0002] As a means of transportation, cars emit a large amount of carbon, nitrogen, sulfur oxides, hydrocarbons, lead compounds and other air pollutants every day. They are an important source of air pollution and bring serious harm to human health and the ecological environment. Energy conservation and emission reduction are the eternal theme of the development of the automobile industry. Continuously strengthening energy conservation and emission reduction has become an urgent need for my country's economy to achieve sound and rapid development. A gas filling machine refers to a gas filling device that provides fuel to natural gas vehicles in the form of compressed natural gas. The gas in the natural gas pipeline is generally pre-purified to remove sulfur and water in the gas, and then the pressure is compressed from 0.1-1.0Mpa to 25Mpa by a compressor unit, and finally the vehicle is filled with gas through a gas dispenser. When the existing LNG gas filling machine is in use, since liquefied natural gas will automatically gasify under atmospheric pressure, it is easy to spray out natural gas. Once it is sprayed into the surrounding environment, it is easy to cause safety accidents. Summary of the invention

[0003] The object of the present invention is to provide a safety device for preventing liquid spraying during liquid filling and gun withdrawal of an LNG filling machine, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety device for preventing liquid spraying from the gun when adding liquid to an LNG filling machine, comprising a filling pipe for adding liquid and a sealing cylinder installed at the end of the filling pipe to prevent natural gas from spraying out, wherein the sealing cylinder is slidably installed on the filling pipe, and a fixing cylinder is welded and fixed on the filling pipe, the side surface of the fixing cylinder is fixedly connected to one end of a first spring sleeved on the filling pipe, the other end of the first spring is fixedly connected to the side surface of the sealing cylinder, and a limiting ring is integrally formed and fixed at one end of the filling pipe located in the sealing cylinder. The design of the limiting ring prevents the sealing cylinder from slipping out of the filling pipe. During the filling process, the sealing cylinder is covered at the filling port of the car, and then as the staff continues to exert force, the filling pipe is inserted into the filling port of the car, and then the valve on the filling pipe is opened to start adding natural gas liquid. After the filling is completed, the filling pipe is withdrawn. At this time, the design of the sealing cylinder effectively prevents the natural gas from spraying onto the body of the staff, and the use is safe.

[0005] As a further solution of the present invention: a liquid filling port for the liquid filling tube to pass through is opened at the end of the sealing cylinder, and an integrally formed first sealing ring is fixed around the liquid filling port on the outer wall of the sealing cylinder, and the first sealing ring can effectively improve the sealing effect between the sealing cylinder and the car.

[0006] As a further solution of the present invention: the two ends of the sealing cylinder facing the fixed cylinder are respectively fixedly connected to one end of an elastic telescopic rod, the other end of the elastic telescopic rod is fixedly connected to the side of the fixed cylinder, the elastic telescopic rods are parallel to the liquid filling tube, and the elastic telescopic rods are provided with a one-way valve, so that the ejected natural gas enters the fixed cylinder through the elastic telescopic rod. As a further solution of the present invention: a sliding plate is slidably installed inside the fixed cylinder, and the sliding plate is sleeved on the liquid filling tube, one end of the sliding plate facing the outside of the fixed cylinder is fixedly connected to one end of the connecting rod, the other end of the connecting rod extends out of the fixed cylinder and is fixedly connected to one end of the side of the sliding ring, the sliding ring is slidably installed on the liquid filling tube, the other end of the sliding plate facing the outside of the fixed cylinder is fixedly connected to one end of the connecting tube, the other end of the connecting tube extends out of the fixed cylinder and is fixedly connected to the other end of the side of the sliding ring, and the other end of the connecting tube is fixedly connected to one side port of the three-way valve fixed on the other side of the sliding ring, the other side port of the three-way valve is connected to the input end of the recovery tank, and the recovery tank is installed on the sliding ring.

[0007] It should be noted that the middle port of the three-way valve is connected to the atmosphere. In actual use, the filling pipe is first inserted into the gas filling port of the car. First, the middle port of the three-way valve is adjusted to be connected to the atmosphere. The sliding plate is pushed to slide to the end of the fixed cylinder toward the sealing cylinder through the sliding ring to discharge the air in the fixed cylinder. Then, the three-way valve is adjusted to connect the recovery tank with the connecting pipe. At this time, the sliding plate is pushed to slide back and forth in the fixed cylinder through the sliding ring. With the continuous reciprocating motion of the sliding plate, the natural gas in the sealing cylinder is extracted and squeezed into the recovery tank for storage, thereby achieving the effect of recovering the sprayed natural gas and improving the practicality of the safety device.

[0008] As a further solution of the present invention: the recovery tank is threadedly fixed on the fixing frame, the fixing frame is fixedly connected to one end of the connecting frame, and the other end of the connecting frame is fixedly connected to the sliding ring. The threaded connection facilitates the disassembly and assembly of the recovery tank, thereby replacing the recovery tank. When a recovery tank is full of collected natural gas, the recovery tank can be removed and directly replaced with a new recovery tank.

[0009] As a further scheme of the present invention: the recovery tank includes a recovery tank body, a threaded wall is provided on the outer wall of the tank body of the recovery tank body, the recovery tank body is fixedly connected to the fixing frame through the threaded wall, an integrally formed fixing pipe is fixed to one end of the recovery tank body facing the three-way valve, a connecting disk is welded and fixed to the end of the fixing pipe, a connecting plate is rotatably installed on the outer wall of the connecting disk through a bearing, the side surface of the connecting plate is fixedly connected to one end of the second spring, the other end of the second spring is fixedly connected to the side surface of the second sealing ring, an air intake pipe is welded and fixed inside the second sealing ring, the outer diameter of the air intake pipe is the same as the inner diameter of the fixing pipe, and the outer diameter of the air intake pipe is the same as the inner diameter of the port of the three-way valve, so that the end of the three-way valve can be inserted into the air intake pipe, one end of the air intake pipe passes through the connecting disk and the connecting plate and is inserted into the fixing pipe, and a one-way valve is provided at one end of the air intake pipe located in the fixing pipe, and an air outlet pipe is fixed to the other end of the recovery tank body, and a valve is provided on the air outlet pipe.

[0010] It should be noted that when assembling the recovery tank, as the recovery tank body is threadedly connected to the fixing frame, the recovery tank body is pushed toward the three-way valve, and the end of the intake pipe is inserted into the three-way valve through the guiding action of the fixing frame. As the recovery tank body continues to move toward the three-way valve, the second sealing ring is stuck at the connection between the intake pipe and the three-way valve, thereby improving the sealing between the three-way valve and the intake pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The structural design of the sealing cylinder can effectively prevent natural gas from spraying onto the body of the worker during the liquid addition process, making it safe to use.

[0013] Through the structural design of the fixed cylinder and the recovery tank, in actual use, not only can the natural gas be prevented from being sprayed into the atmosphere, but the sprayed natural gas can also be collected, thereby improving the practicality of the safety device.

[0014] The recovery tank is easy to disassemble and assemble, so that the recovery tank can be easily replaced and the full recovery tank can be easily stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a safety device for preventing liquid spraying when retracting the gun during filling of an LNG filling machine. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the structure of a safety device for preventing liquid spraying when retracting the gun during filling of an LNG filling machine. Figure 2 .

[0017] Figure 3 This is a cross-sectional view of a safety device for preventing liquid spray when retracting the gun during liquid filling in an LNG filling machine.

[0018] Figure 4 This is a schematic diagram of the structure of the exterior of a recovery tank in a safety device for preventing liquid spray during the liquid filling and gun withdrawal of an LNG filling machine.

[0019] Figure 5 This is a schematic diagram of the structure inside the recovery tank of a safety device for preventing liquid spray during the liquid filling and gun withdrawal of an LNG filling machine.

[0020] As shown in the figure: liquid adding pipe 1, recovery tank 2, recovery tank body 21, threaded wall 22, guide angle 23, fixed pipe 24, connecting plate 25, air inlet pipe 26, second sealing ring 27, second spring 28, connecting plate 29, air outlet pipe 210, fixing frame 3, three-way valve 4, connecting frame 5, sliding ring 6, connecting pipe 7, fixing cylinder 8, elastic hose 9, sealing cylinder 10, first spring 11, connecting rod 12, first sealing ring 13, liquid adding port 14, sliding plate 15, limit ring 16. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figures 1 to 5 In an embodiment of the present invention, a safety device for preventing liquid spraying during liquid filling and gun withdrawal of an LNG gas filling machine comprises a liquid filling pipe 1 for liquid filling and a sealing cylinder 10 installed at the end of the liquid filling pipe 1 for preventing natural gas from spraying out, wherein the sealing cylinder 10 is slidably installed on the liquid filling pipe 1, and a fixing cylinder 8 is welded and fixed on the liquid filling pipe 1, and the side surface of the fixing cylinder 8 is fixedly connected to one end of a first spring 11 sleeved on the liquid filling pipe 1, and the other end of the first spring 11 is fixedly connected to the side surface of the sealing cylinder 10, and a limiting ring 16 is integrally formed and fixed at one end of the liquid filling pipe 1 located in the sealing cylinder 10. The design of the limiting ring 16 prevents the sealing cylinder 10 from sliding out of the liquid filling pipe 1. During the liquid filling process, the sealing cylinder 10 is covered at the gas filling port of the car, and then as the staff continues to exert force, the liquid filling pipe 1 is inserted into the gas filling port of the car, and then the valve on the liquid filling pipe 1 is opened to start adding natural gas liquid. After the liquid filling is completed, the liquid filling pipe 1 is withdrawn. At this time, the design of the sealing cylinder 10 effectively prevents the natural gas from spraying onto the body of the staff, and the use is safe.

[0023] The end of the sealing cylinder 10 is provided with a liquid filling port 14 for the liquid filling pipe 1 to pass through, and an integrally formed first sealing ring 13 is fixed around the liquid filling port 14 on the outer wall of the sealing cylinder 10 , and the first sealing ring 13 can effectively improve the sealing effect between the sealing cylinder 10 and the car.

[0024] The two ends of the sealing cylinder 10 on one side facing the fixed cylinder 8 are respectively fixedly connected to one end of an elastic telescopic rod 9, and the other end of the elastic telescopic rod 9 is fixedly connected to the side of the fixed cylinder 8. The elastic telescopic rods 9 are parallel to the liquid adding pipe 1, and the elastic telescopic rods 9 are provided with a one-way valve, so that the ejected natural gas can enter the fixed cylinder 8 through the elastic telescopic rod 9.

[0025] A sliding plate 15 is slidably installed inside the fixed cylinder 8, and the sliding plate 15 is sleeved on the liquid adding tube 1, one end of the sliding plate 15 facing outside the fixed cylinder 8 is fixedly connected to one end of the connecting rod 12, the other end of the connecting rod 12 extends out of the fixed cylinder 8 and is fixedly connected to one end of the side of the sliding ring 6, the sliding ring 6 is slidably installed on the liquid adding tube 1, the other end of the sliding plate 15 facing outside the fixed cylinder 8 is fixedly connected to one end of the connecting tube 7, the other end of the connecting tube 7 extends out of the fixed cylinder 8 and is fixedly connected to the other end of the side of the sliding ring 6, and the other end of the connecting tube 7 is fixedly connected to one side port of the three-way valve 4 fixed on the other side of the sliding ring 6, the other side port of the three-way valve 4 is connected to the input end of the recovery tank 2, and the recovery tank 2 is installed on the sliding ring 6.

[0026] It should be noted that the middle port of the three-way valve 4 is connected to the atmosphere. In actual use, the filling pipe 1 is first inserted into the gas filling port of the car. First, the middle port of the three-way valve 4 is adjusted to be connected to the atmosphere. The sliding plate 15 is pushed to slide to the end of the fixed cylinder 8 toward the sealing cylinder 10 through the sliding ring 6, and the air in the fixed cylinder 8 is discharged first. Then the three-way valve 4 is adjusted to connect the recovery tank 2 with the connecting pipe 7. At this time, the sliding plate 15 is pushed to slide back and forth in the fixed cylinder 8 through the sliding ring 6. With the continuous reciprocating motion of the sliding plate 15, the natural gas in the sealing cylinder 10 is extracted and squeezed into the recovery tank 2 for storage, thereby achieving the effect of recovering the ejected natural gas and improving the practicality of the safety device.

[0027] The recovery tank 2 is threadedly connected and fixed on the fixing frame 3, the fixing frame 3 is fixedly connected to one end of the connecting frame 5, and the other end of the connecting frame 5 is fixedly connected to the sliding ring 6. The threaded connection facilitates the disassembly and assembly of the recovery tank 2, so that the recovery tank 2 can be replaced. When a recovery tank 2 is full of collected natural gas, the recovery tank 2 can be removed and directly replaced with a new recovery tank 2.

[0028] The recovery tank body 21, the threaded wall 22, the guide angle 23, the fixed pipe 24, the connecting plate 25, the air inlet pipe 26, the second sealing ring 27, the second spring 28, the connecting plate 29, the air outlet pipe 210, the recovery tank 2 includes a recovery tank body 21, a threaded wall 22 is arranged on the outer wall of the tank body of the recovery tank body 21, the recovery tank body 21 is fixedly connected to the fixing frame 3 through the threaded wall 22, an integrally formed fixed pipe 24 is fixed to one end of the recovery tank body 21 facing the three-way valve 4, a connecting plate 25 is welded and fixed to the end of the fixing pipe 24, a connecting plate 29 is rotatably mounted on the outer wall of the connecting plate 25 through a bearing, and the side of the connecting plate 29 is connected to the second spring One end of the spring 28 is fixedly connected, and the other end of the second spring 28 is fixedly connected to the side of the second sealing ring 27. An intake pipe 26 is welded and fixed inside the second sealing ring 27. The outer diameter of the intake pipe 26 is the same as the inner diameter of the fixed pipe 24, and the outer diameter of the intake pipe 26 is the same as the inner diameter of the port of the three-way valve 4, so that the end of the three-way valve 4 can be inserted into the intake pipe 26, one end of the intake pipe 26 passes through the connecting disk 25 and the connecting plate 29 and is inserted into the fixed pipe 24, and a one-way valve 211 is provided at one end of the intake pipe 26 located in the fixed pipe 24, and an outlet pipe 210 is fixed to the other end of the recovery tank body 21, and a valve is provided on the outlet pipe 210.

[0029] It should be noted that when assembling the recovery tank 2, as the recovery tank body 21 is threadedly connected to the fixing frame 3, the recovery tank body 21 is pushed toward the three-way valve 4, and through the guiding effect of the fixing frame 3, the end of the intake pipe 26 is inserted into the three-way valve 4. As the recovery tank body 21 continues to move toward the three-way valve 4, the second sealing ring 27 is stuck at the connection between the intake pipe 26 and the three-way valve 4, thereby improving the sealing between the three-way valve 4 and the intake pipe 26.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention, and the contents not described in detail in this specification shall belong to the prior art known to professional and technical personnel in the field.

Claims

1. A safety device for preventing liquid spraying during liquid filling and gun withdrawal of an LNG filling machine, comprising a liquid filling pipe (1) for filling liquid and a sealing cylinder (10) installed at the end of the liquid filling pipe (1) for preventing natural gas from spraying out, characterized in that: The sealing cylinder (10) is slidably mounted on the liquid adding tube (1), a fixed cylinder (8) is welded and fixed on the liquid adding tube (1), a side surface of the fixed cylinder (8) is fixedly connected to one end of a first spring (11) sleeved on the liquid adding tube (1), the other end of the first spring (11) is fixedly connected to the side surface of the sealing cylinder (10), and an end of the liquid adding tube (1) located inside the sealing cylinder (10) is integrally formed with a fixed limiting ring (16); the two ends of the sealing cylinder (10) on one side facing the fixed cylinder (8) are respectively fixedly connected to one end of an elastic telescopic rod (9), the other end of the elastic telescopic rod (9) is fixedly connected to the side surface of the fixed cylinder (8), the elastic telescopic rods (9) are parallel to the liquid adding tube (1), and a one-way valve is arranged on the elastic telescopic rods (9); a sliding plate (15) is slidably mounted inside the fixed cylinder (8), and the sliding plate (15) is sleeved on the liquid adding tube (1), and the sliding plate (15) faces the fixed cylinder ( One end of the side outside the fixed cylinder (8) is fixedly connected to one end of the connecting rod (12), the other end of the connecting rod (12) extends out of the fixed cylinder (8) and is fixedly connected to one end of the side of the sliding ring (6), the sliding ring (6) is slidably installed on the liquid adding pipe (1), the other end of the sliding plate (15) facing the other end of the side outside the fixed cylinder (8) is fixedly connected to one end of the connecting pipe (7), the other end of the connecting pipe (7) extends out of the fixed cylinder (8) and is fixedly connected to the other end of the side of the sliding ring (6), and the other end of the connecting pipe (7) is fixedly connected to a port on one side of the three-way valve (4) fixed on the other side of the sliding ring (6), the other port on the other side of the three-way valve (4) is connected to the input end of the recovery tank (2), and the recovery tank (2) is installed on the sliding ring (6); the recovery tank (2) is threadedly connected and fixed on the fixing frame (3), the fixing frame (3) is fixedly connected to one end of the connecting frame (5), and the other end of the connecting frame (5) is fixedly connected to the sliding ring (6);The recovery tank (2) comprises a recovery tank body (21), a threaded wall (22) is arranged on the outer wall of the recovery tank body (21), the recovery tank body (21) is fixedly connected to the fixing frame (3) via the threaded wall (22), an integrally formed fixing pipe (24) is fixed to one end of the recovery tank body (21) facing the three-way valve (4), a connecting plate (25) is welded and fixed to the end of the fixing pipe (24), a connecting plate (29) is rotatably mounted on the outer wall of the connecting plate (25) via a bearing, a side surface of the connecting plate (29) is fixedly connected to one end of a second spring (28), and the other end of the second spring (28) is connected to the first spring (28). The sides of the two sealing rings (27) are fixedly connected, an air intake pipe (26) is welded and fixed inside the second sealing ring (27), the outer diameter of the air intake pipe (26) is the same as the inner diameter of the fixed pipe (24), and the outer diameter of the air intake pipe (26) is the same as the inner diameter of the port of the three-way valve (4), one end of the air intake pipe (26) passes through the connecting plate (25) and the connecting plate (29) and is inserted into the fixed pipe (24), and a one-way valve (211) is provided at one end of the air intake pipe (26) located in the fixed pipe (24), and an air outlet pipe (210) is fixed at the other end of the recovery tank body (21), and a valve is provided on the air outlet pipe (210). ; 2. A safety device for preventing liquid spraying when retracting the gun during filling of an LNG filling machine according to claim 1, characterized in that: A liquid adding port (14) for the liquid adding pipe (1) to pass through is provided at the end of the sealing cylinder (10), and an integrally formed first sealing ring (13) is fixed on the outer wall of the sealing cylinder (10) around the liquid adding port (14).

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