Device for reducing LNG unloading loss

Abstract

The utility model relates to the technical field of unloading devices, in particular to a device for reducing LNG unloading loss. According to the technical scheme, the device comprises a front box, a cover plate and a box body, side boxes are fixed to the two sides of the box body, a feeding pipe is installed in the middle of the upper end face of the box body in a penetrating mode, piston blocks are slidably installed on the two sides of the interior of the box body, an air box is fixed to the middle of the interior of each side box, and air cylinders are arranged on the two sides of each air box; the front box is fixed to the front ends of the side boxes and the box body, built-in boxes are fixed to the two sides of the interior of the front box, a butt joint pipe is installed in the middle of the interior of the front box in a penetrating mode, guide rails are arranged on the two sides of the butt joint pipe, positioning blocks are slidably installed in the guide rails, and the cover plate is fixed to an opening in the front end of the front box through fixing bolts. Transom windows are formed in the two sides of the cover plate. The device has the advantages that unloading loss is reduced, practicability is high, butt joint of external pipelines is convenient and fast, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of unloading devices, in particular to a device for reducing the loss of LNG unloading. Background Art

[0002] LNG unloading refers to: LNG unloading at a gasification station refers to the process of safely and efficiently transferring liquefied natural gas from the transport vehicle to the gasification station storage tank.

[0003] When unloading with existing equipment, it is easy for the unloading of LNG to be incomplete due to the unskilled operators and the high pressure of the municipal gas pipeline network. The residual liquid and gaseous natural gas in the tank truck cannot be fully unloaded into the LNG storage tank or enter the municipal gas pipeline network, resulting in unloading losses. In addition, the existing unloading device is inconvenient to install when connecting to external pipelines. Utility Model Content

[0004] The purpose of the utility model is to provide a device for reducing LNG unloading losses, which has the advantages of reducing unloading losses, strong practicality, convenient external pipeline docking, and simple operation, and solves the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for reducing LNG unloading losses, comprising a front box, a cover plate and a box body, side boxes are fixed on both sides of the box body, a feed pipe is installed through the middle of the upper end surface of the box body, piston blocks are slidably installed on both sides of the interior of the box body, a gas box is fixed in the middle of the side box, and cylinders are provided on both sides of the gas box, the front box is fixed to the front end of the side box and the box body, built-in boxes are fixed on both sides of the front box, a docking pipe is installed through the middle of the interior of the front box, and guide rails are provided on both sides of the docking pipe, a positioning block is slidably installed in the guide rails, the cover plate is fixed to the front end opening of the front box by fixing bolts, and air windows are opened on both sides of the cover plate.

[0006] When using a device for reducing LNG unloading losses in the technical solution, when connecting the external pipeline, the external pipeline is inserted from the assembly cylinder to connect the external pipeline with the butt pipe, and then the built-in motor of the guide rail is started to drive the screw to rotate, and the screw thread drive realizes the displacement of the positioning block. The positioning block passes through the side groove and is inserted into the positioning grooves on both sides of the external pipeline to complete the pipeline connection and positioning. The feed pipe of the device is connected to the bottom of the storage tank of the LNG low-temperature tank truck, and the liquid natural gas in the tank flows into the box body through the pressure difference, and then is discharged from the external pipeline through the connecting pipe and the butt pipe. When the liquid natural gas stock in the tank is lower than a certain amount, the built-in air pump of the gas box is started, and the compressed air in the gas box is discharged outwardly through the air pump and the return air pipe, so that the cylinder drives the piston block to contract. At this time, the space inside the box increases to produce a liquid level difference, so that the residual liquid natural gas in the storage tank flows into the box, and then the air pump is started to introduce the compressed gas into the gas box through the intake pipe, so that the cylinder drives the piston block to reset, and the space in the box is reduced by clamping the two piston blocks, so that the liquid natural gas in the box is discharged outward.

[0007] Preferably, both ends of the box body are penetrated and installed with side tubes, and the top of the cylinder passes through the side tubes and is fixed on the piston block. The piston block is driven to move by the cylinder.

[0008] Preferably, a connecting pipe is installed through the front end surface of the box body, and the front end of the connecting pipe is connected to the butt joint pipe. The liquefied natural gas in the box body is introduced into the butt joint pipe through the connecting pipe.

[0009] Preferably, the gas box is connected to the corresponding pump body in the built-in box through the air inlet pipe and the air return pipe, and the bottom of the cylinder is connected to the gas box. The corresponding pump body realizes the introduction and discharge of gas in the gas box through the air inlet pipe and the air return pipe.

[0010] Preferably, both sides of the front end of the butt joint pipe are provided with side grooves, and the positioning blocks correspond to the positions of the side grooves. The positioning blocks pass through the side grooves and are clamped on both sides of the external pipe to achieve positioning.

[0011] Preferably, a screw rod is rotatably installed in the guide rail, and the front end thread of the screw rod penetrates the corresponding positioning block. The screw rod is driven to rotate by the built-in motor of the guide rail, and the screw rod thread drives the positioning block to move.

[0012] Preferably, an assembly tube is installed through the middle of the cover plate, and the rear end of the assembly tube is connected to the butt joint tube. The external pipe passes through the assembly tube and is connected to the butt joint tube.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: the operator starts the device through an external control device when the external power supply is connected. When connecting the external pipeline, the external pipeline is inserted from the assembly tube to connect the external pipeline with the butt pipe, and then the built-in motor of the guide rail is started to drive the screw rod to rotate. The screw rod thread drive realizes the displacement of the positioning block. The positioning block passes through the side groove and is inserted into the positioning grooves on both sides of the external pipeline to complete the pipeline connection and positioning. The feed pipe of the device is connected to the bottom of the storage tank of the LNG cryogenic tank truck. The liquid natural gas in the tank body flows into the box body through the pressure difference, and then is discharged from the external pipeline through the connecting pipe and the butt pipe. When the tank When the stock of liquid natural gas in the body is lower than a certain amount, the built-in air pump in the air box is started, and the compressed air in the air box is discharged outward through the air pump and the return air pipe, so that the cylinder drives the piston block to contract. At this time, the space inside the box increases and a liquid level difference is generated, so that the remaining liquid natural gas in the storage tank flows into the box. The air pump is started again to introduce the compressed gas into the air box through the air inlet pipe, so that the cylinder drives the piston block to reset, and the space in the box is reduced by clamping the two piston blocks, so that the liquid natural gas in the box is discharged outward. The device is easy to operate, and can reduce the unloading loss by emptying the liquid natural gas in the tank. At the same time, it is convenient for the external pipeline connection mechanism to reduce the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the front box structure of the utility model;

[0017] Figure 4 This is a front view structural diagram of the front box of the utility model;

[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the box body of the utility model.

[0019] In the figure: 1. side box; 2. front box; 3. air window; 4. cover plate; 5. assembly cylinder; 6. box body; 7. feed pipe; 8. cylinder; 9. air box; 10. intake pipe; 11. return pipe; 12. connecting pipe; 13. side cylinder; 14. built-in box; 15. guide rail; 16. butt joint; 17. positioning block; 18. side groove; 19. screw rod; 20. piston block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1

[0022] See also Figures 1 to 5 The utility model provides an embodiment: a device for reducing LNG unloading loss, comprising a front box 2, a cover plate 4 and a box body 6, side boxes 1 are fixed on both sides of the box body 6, a feed pipe 7 is installed through the middle of the upper end surface of the box body 6, piston blocks 20 are slidably installed on both sides of the box body 6, a gas box 9 is fixed in the middle of the side box 1, and cylinders 8 are provided on both sides of the gas box 9.

[0023] Furthermore,

[0024] Side tubes 13 are installed through both ends of the box body 6, and the top of the cylinder 8 passes through the side tube 13 and is fixed on the piston block 20, so that the piston block 20 is displaced by the cylinder 8.

[0025] Furthermore,

[0026] A connecting pipe 12 is installed through the front end surface of the box body 6 , and the front end of the connecting pipe 12 is connected to the butt joint 16 , so that the liquid natural gas in the box body 6 is introduced into the butt joint 16 through the connecting pipe 12 .

[0027] Furthermore,

[0028] The air box 9 is connected to the corresponding pump body built into the built-in box 14 through the air inlet pipe 10 and the air return pipe 11 respectively. The bottom of the cylinder 8 is connected to the air box 9, and the corresponding pump body realizes the introduction and discharge of gas in the air box 9 through the air inlet pipe 10 and the air return pipe 11 respectively.

[0029] Embodiment 2

[0030] See also Figures 1 to 5 The utility model provides an embodiment: a device for reducing LNG unloading loss, comprising a front box 2, a cover plate 4 and a box body 6, wherein the front box 2 is fixed at the front end of the side box 1 and the box body 6, and built-in boxes 14 are fixed on both sides of the interior of the front box 2, a docking pipe 16 is installed through the middle of the interior of the front box 2, and guide rails 15 are provided on both sides of the docking pipe 16, and positioning blocks 17 are slidably installed in the guide rails 15, the cover plate 4 is fixed to the front end opening of the front box 2 by fixing bolts, and air windows 3 are opened on both sides of the cover plate 4.

[0031] Furthermore,

[0032] Side grooves 18 are provided on both sides of the front end of the butt joint pipe 16 , and the positioning blocks 17 correspond to the side grooves 18 , and the positioning blocks 17 pass through the side grooves 18 and are clamped on both sides of the external pipe to achieve positioning.

[0033] Furthermore,

[0034] A screw rod 19 is rotatably installed in the guide rail 15 , and the front end thread of the screw rod 19 penetrates the corresponding positioning block 17 . The screw rod 19 is driven to rotate by the built-in motor of the guide rail 15 , and the screw rod 19 is threadedly driven to realize the displacement of the positioning block 17 .

[0035] Furthermore,

[0036] An assembly tube 5 is installed through the middle of the cover plate 4 , and the rear end of the assembly tube 5 is connected to the butt joint tube 16 . The external pipeline passes through the assembly tube 5 and is connected to the butt joint tube 16 .

[0037] During the operation of the utility model, the external power supply is used, and the operator starts the device through the external control device. When connecting the external pipeline, the external pipeline is inserted into the butt joint pipe 16 after passing through the assembly tube 5, so that the external pipeline is connected to the sealing gasket at the bottom of the butt joint pipe 16, and then the built-in motor of the guide rail 15 is started to drive the screw rod 19 to rotate, and the screw rod 19 is threadedly driven to realize the displacement of the positioning block 17, and the positioning block 17 is inserted into the positioning grooves on both sides of the external pipeline. The external pipeline is clamped and positioned by the positioning block 17 to complete the pipeline installation. The feed pipe 7 of the device is connected to the bottom of the storage tank of the LNG cryogenic tank truck, and the pressure difference is used to make The liquefied natural gas in the tank flows into the box body 6, and then is discharged from the external pipeline through the connecting pipe 12 and the butt pipe 16. When the amount of liquefied natural gas in the tank is lower than a certain amount, the built-in air pump of the gas box 9 is started, and the compressed air in the gas box 9 is discharged outwardly through the air pump and the return air pipe 11, so that the cylinder 8 drives the piston block 20 to contract. At this time, the space inside the box body 6 increases to produce a liquid level difference, so that the remaining liquefied natural gas in the storage tank flows into the box body 6, and then the air pump is started to introduce the compressed gas into the gas box 9 through the intake pipe 10, so that the cylinder 8 drives the piston block 20 to reset, and the space inside the box body 6 is reduced by clamping the two piston blocks 20, so that the liquefied natural gas in the box body 6 is discharged outward.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for reducing LNG unloading losses, comprising a front box (2), a cover plate (4) and a box body (6), characterized in that: Side boxes (1) are fixed on both sides of the box body (6), a feed pipe (7) is installed through the middle of the upper end surface of the box body (6), piston blocks (20) are slidably installed on both sides of the interior of the box body (6), an air box (9) is fixed in the middle of the interior of the side box (1), and cylinders (8) are provided on both sides of the air box (9), the front box (2) is fixed to the front ends of the side box (1) and the box body (6), built-in boxes (14) are fixed on both sides of the interior of the front box (2), a butt pipe (16) is installed through the middle of the interior of the front box (2), and guide rails (15) are provided on both sides of the butt pipe (16), and positioning blocks (17) are slidably installed in the guide rails (15), the cover plate (4) is fixed to the front end opening of the front box (2) by fixing bolts, and air windows (3) are provided on both sides of the cover plate (4).

2. The device for reducing LNG unloading loss according to claim 1 is characterized in that: Both ends of the box body (6) are penetrated by side tubes (13), and the top end of the cylinder (8) passes through the side tubes (13) and is fixed on the piston block (20).

3. The device for reducing LNG unloading loss according to claim 1 is characterized in that: A connecting pipe (12) is installed through the front end surface of the box body (6), and the front end of the connecting pipe (12) is connected to the butt joint pipe (16).

4. The device for reducing LNG unloading loss according to claim 1 is characterized in that: The air box (9) is connected to the corresponding pump body built into the built-in box (14) through an air inlet pipe (10) and an air return pipe (11), and the bottom of the air cylinder (8) is connected to the air box (9).

5. The device for reducing LNG unloading loss according to claim 1 is characterized in that: Side grooves (18) are provided on both sides of the front end of the butt joint pipe (16), and the positioning blocks (17) correspond to the side grooves (18).

6. The device for reducing LNG unloading loss according to claim 1 is characterized in that: A screw rod (19) is rotatably mounted in the guide rail (15), and a front end thread of the screw rod (19) penetrates the corresponding positioning block (17).

7. The device for reducing LNG unloading loss according to claim 1 is characterized in that: An assembly tube (5) is installed through the middle of the cover plate (4), and the rear end of the assembly tube (5) is connected to a butt joint tube (16).

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