CN214634218U

CN214634218U - Automatic recovery device for compressed export natural gas

Info

Publication number: CN214634218U
Application number: CN202120914447.5U
Authority: CN
Inventors: 张丽波; 施晨曦; 陈楠; 周祖宇; 张蓉; 张雅坤; 濮珺; 杨洋; 李茹楠
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-11-09
Anticipated expiration: 2031-04-29

Abstract

The utility model discloses an automatic recovery unit of defeated natural gas outward of compression, including the automatic recovery unit body, the automatic recovery unit body includes oil and gas separator, dirty liquid jar and intercommunication and fixes the blow off pipe between oil and gas separator and dirty liquid jar, be provided with the solenoid valve on the blow off pipe, be provided with the automatic waste fitting discharging with adjustable solenoid valve matched with on the oil and gas separator, automatic waste fitting discharging with adjustable is including inlaying the standpipe on oil and gas separator bottom inner wall, and the top of standpipe is established to shutoff mechanism, and the bottom of standpipe extends to oil and gas separator's below. The utility model relates to a rationally, convenient to use, the automatic solenoid valve of in time opening when the foul solution of being convenient for in oil and gas separator is more of blowdown need not personnel and observes and manually open, labour saving and time saving, and the liquid level when the personnel of being convenient for adjust automatic blowdown according to the user demand satisfies the user demand, is favorable to using.

Description

Automatic recovery device for compressed export natural gas

Technical Field

The utility model relates to an automatic recovery plant technical field especially relates to an automatic recovery unit of defeated natural gas outward in compression.

Background

In the petroleum and natural gas collection, some oil and water are mixed into natural gas, the oil and water contained in the natural gas are also called as dirty liquid, in order to separate the dirty liquid from the natural gas, an oil-gas separator is arranged at an oil-gas gathering, transporting and storing station, the separated gas is compressed by a natural gas compressor and then is transported outwards, and the separated dirty liquid enters a dirty liquid recovery system; the natural gas compressor can also produce some dirty liquid in the natural gas compression process, only can increase an oil-gas separator in addition for compressor one-level separator to discharge dirty liquid, because the gas that adds oil-gas separator can't circulate in the natural gas compressor, the natural gas can only discharge in the atmosphere, has caused great economic loss.

In view of the above, in the prior art, the patent of application No. 201320289329.5 discloses an automatic recovery device for compressed exported natural gas, which comprises an oil-gas separator, and the device is further provided with an air-extracting compressor, a sewage tank and a deaerator, wherein the oil-gas separator is seated on the sewage tank provided with the deaerator, is communicated with the sewage tank through a sewage pipeline and is connected with a second-stage separator to a fourth-stage separator of a natural gas compressor through a multi-stage sewage inlet pipeline; the sewage tank is connected with the first-stage separator of the natural gas compressor through a first-stage sewage inlet pipeline; the deaerator is connected with the sewage recovery system through a deaerator sewage discharge pipeline and is communicated with the sewage tank through a deaerator exhaust pipeline; the air extraction compressor is communicated with the dirty liquid tank through an air inlet pipeline of the air extraction compressor and a dirty liquid discharge pipeline of the air extraction compressor, is communicated with the oil-gas separator through an air exhaust pipeline of the air extraction compressor, and is connected with the natural gas compressor through an air exhaust pipeline of the oil-gas separator, and a drain valve is arranged on the drain pipeline; the device can realize zero emission and zero pollution, fully recovers natural gas in the dirty liquid, effectively protects the environment and brings huge economic benefits to enterprises.

The automatic recovery device for compressed export natural gas disclosed in the patent realizes full recovery of natural gas in dirty liquid, but has some defects; the automatic recovery device for the compressed natural gas is characterized in that a sewage discharge pipe between the oil-gas separator and the sewage tank has the defect that the sewage discharge is not convenient to automatically and timely open according to actual needs, (the sewage discharge liquid level in the oil-gas separator is observed manually, the sewage discharge mode is manually opened, the automation is low, a person is required to be specially equipped to observe the liquid level of the sewage, time and labor are wasted), the sewage discharge is not timely, the use requirement cannot be met, the phenomenon is improved, and therefore the automatic recovery device for the compressed natural gas is provided and used for solving the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing an automatic recovery device for compressing the exported natural gas.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an automatic recovery device for compressed natural gas for outward transportation comprises an automatic recovery device body, wherein the automatic recovery device body comprises an oil-gas separator, a sewage tank and a sewage discharge pipe which is communicated and fixed between the oil-gas separator and the sewage tank, an electromagnetic valve is arranged on the sewage discharge pipe, an adjustable automatic sewage discharge device matched with the electromagnetic valve is arranged on the oil-gas separator, the adjustable automatic sewage discharge device comprises a vertical pipe embedded on the inner wall of the bottom of the oil-gas separator, the top end of the vertical pipe is provided with a plugging mechanism, and the bottom end of the vertical pipe extends to the lower part of the oil-gas separator;

the vertical pipe is provided with an automatic sewage draining mechanism matched with the electromagnetic valve, and the vertical pipe is provided with a discharge liquid level adjusting mechanism matched with the automatic sewage draining mechanism.

Preferably, the automatic sewage draining mechanism comprises a square rod arranged in the vertical pipe, the top end of the square rod extends to the upper portion of the vertical pipe and is fixedly connected with a hollow floating plate, a counterweight extrusion block is fixedly connected to the bottom end of the square rod, a controller and a storage battery are fixedly mounted on the right side of the vertical pipe, the controller and the electromagnetic valve are both electrically connected with the storage battery, the controller is electrically connected with the electromagnetic valve, a same adjusting plate is slidably mounted between the inner walls of the two sides of the vertical pipe, an adjusting plate is movably sleeved on the square rod, an opening touch switch is fixedly connected to the left side of the bottom of the adjusting plate, a supporting seat is fixedly connected to the inner wall of the left side of the vertical pipe, a closing touch switch is fixedly connected to the top of the supporting seat, the opening touch switch and the closing touch switch are both electrically connected with the controller, the bottom of the counterweight extrusion block is in movable contact with a touch end for closing the touch switch, and the opening touch switch is located above the counterweight extrusion block and matched with the counterweight extrusion block.

Preferably, discharge liquid level guiding mechanism is including rotating the internal thread sleeve pipe of installing on standpipe top inner wall, and internal thread sleeve pipe internal thread cover is equipped with the screw rod, the bottom of screw rod extend to the internal thread sheathed tube below and with the top fixed connection of regulating plate, the welding cover is equipped with first bevel gear on the internal thread sleeve pipe, and the left side meshing of first bevel gear has second bevel gear, the left side fixedly connected with pivot of second bevel gear, the left end of pivot extends to the left side and the fixedly connected with knob of standpipe.

Preferably, the mounting hole has been seted up on oil and gas separator's the bottom inner wall, and the outer side fixed connection of the inner wall of mounting hole and standpipe, the blow off pipe comprises upper tube and low tube, and the top of upper tube communicates and fixes with oil and gas separator's bottom, and the bottom of low tube communicates and fixes with the top of sewage tank, and the bottom of upper tube and the end fixed connection that intakes of solenoid valve, the top of low tube and the play water end fixed connection of solenoid valve.

Preferably, a square hole is formed in the inner wall of the top of the vertical pipe, a sealing rubber sheet is bonded and sleeved on the outer side of the square rod, the outer side of the sealing rubber sheet is connected with the inner wall of the square hole in a sliding mode, and the gravity of the counterweight extrusion block is smaller than the buoyancy of the hollow floating plate when the hollow floating plate is subjected to water.

Preferably, equal fixedly connected with T shape slide rail on the both sides inner wall of standpipe, the T shape spout that top and bottom set up for the opening is all seted up to the both sides of regulating plate, and T shape spout and the T shape slide rail sliding connection who corresponds, first round hole has been seted up at the top of regulating plate, and the square bar is located first round hole and contactless with the inner wall of first round hole.

Preferably, a circular groove is formed in the inner wall of the top end of the vertical pipe, two first bearings are fixedly sleeved in the circular groove, and inner rings of the first bearings are welded and sleeved with the outer side of the internal thread sleeve.

Preferably, a second round hole is formed in the inner wall of the left side of the vertical pipe, a second bearing is fixedly sleeved in the second round hole, and an inner ring of the second bearing is fixedly sleeved on the outer side of the rotating shaft.

Compared with the prior art, the beneficial effects of the utility model are that:

through the oil-gas separator, the blow-off pipe, the sewage tank, the electromagnetic valve, the vertical pipe, the square rod, the hollow floating plate, the adjusting plate, the counterweight extrusion block, the supporting seat, the closing touch switch, the controller, the opening touch switch, the internal thread sleeve, the screw rod, the second bevel gear, the rotating shaft, the knob and the first bevel gear to be matched with the T-shaped slide rail, when the sewage in the oil-gas separator increases, the sewage upwards floats the hollow floating plate, the hollow floating plate drives the counterweight extrusion block to move upwards through the square rod, the counterweight extrusion block moves upwards to be in contact with the touch end of the opening touch switch for extrusion, the opening touch switch is touched and controls the electromagnetic valve to be opened through the controller, the sewage in the oil-gas separator downwards discharges into the sewage tank through the blow-off pipe and the electromagnetic valve, along with the descending of the sewage caused by sewage discharge, at the moment, the counterweight extrusion block moves downwards under the action of self gravity and drives the hollow floating plate to move downwards through the square rod, the counterweight extrusion block downwards touches and closes the touch end of the touch switch, the touch switch is closed at the moment, the electromagnetic valve is controlled to be closed through the controller, pollution discharge is stopped, and the electromagnetic valve can be automatically and timely opened for pollution discharge when more polluted liquid exists in the oil-gas separator;

when the discharge liquid level of the waste liquid needs to be adjusted, the knob is rotated in the forward direction to drive the second bevel gear to rotate through the rotating shaft, the second bevel gear drives the internal thread sleeve to rotate through the first bevel gear, the internal thread sleeve drives the screw rod to move downwards, the screw rod drives the adjusting plate to slide downwards on the two T-shaped sliding rails, the adjusting plate drives the starting touch switch to move downwards, the distance between the starting touch switch and the counterweight extrusion block is changed at the moment, the height of the starting touch switch of the electromagnetic valve is enabled to slide, and the liquid level when the waste liquid is discharged can be changed.

The utility model relates to a rationally, convenient to use, the automatic solenoid valve of in time opening when the foul solution of being convenient for in oil and gas separator is more of blowdown need not personnel and observes and manually open, labour saving and time saving, and the liquid level when the personnel of being convenient for adjust automatic blowdown according to the user demand satisfies the user demand, is favorable to using.

Drawings

Fig. 1 is a schematic structural view of an automatic recovery device for compressed export natural gas according to the present invention;

fig. 2 is an enlarged sectional view of a portion a in fig. 1.

In the figure: 100 oil-gas separator, 101 sewage pipe, 102 sewage tank, 1 electromagnetic valve, 2 vertical pipes, 3 square rods, 4 hollow floating plates, 5 adjusting plates, 6 counterweight extrusion blocks, 7 supporting seats, 8 closing touch switches, 9 controllers, 10 opening touch switches, 11 internal thread sleeves, 12 screw rods, 13 second bevel gears, 14 rotating shafts, 15 knobs, 16 first bevel gears and 17T-shaped sliding rails.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-2, an automatic recovery device for compressed gas for external transportation comprises an automatic recovery device body, wherein the automatic recovery device body comprises an oil-gas separator 100, a dirty liquid tank 102 and a sewage discharge pipe 101 which is communicated and fixed between the oil-gas separator 100 and the dirty liquid tank 102, an electromagnetic valve 1 is arranged on the sewage discharge pipe 101, an adjustable automatic sewage discharge device matched with the electromagnetic valve 1 is arranged on the oil-gas separator 100, the adjustable automatic sewage discharge device comprises a vertical pipe 2 embedded on the inner wall of the bottom of the oil-gas separator 100, the top end of the vertical pipe 2 is provided with a plugging mechanism, and the bottom end of the vertical pipe 2 extends to the lower part of the oil-gas separator 100; an automatic sewage draining mechanism matched with the electromagnetic valve 1 is arranged on the vertical pipe 2, and a drainage liquid level adjusting mechanism matched with the automatic sewage draining mechanism is arranged on the vertical pipe 2;

the automatic sewage draining mechanism comprises a square rod 3 arranged in a vertical pipe 2, the top end of the square rod 3 extends to the upper part of the vertical pipe 2 and is fixedly connected with a hollow floating plate 4, the bottom end of the square rod 3 is fixedly connected with a counterweight extrusion block 6, the right side of the vertical pipe 2 is fixedly provided with a controller 9 and a storage battery, the controller 9 and the electromagnetic valve 1 are both electrically connected with the storage battery, the controller 9 is electrically connected with the electromagnetic valve 1, the same adjusting plate 5 is slidably arranged between the inner walls of the two sides of the vertical pipe 2, the adjusting plate 5 is movably sleeved on the square rod 3, the left side of the bottom of the adjusting plate 5 is fixedly connected with an opening touch switch 10, the inner wall of the left side of the vertical pipe 2 is fixedly connected with a supporting seat 7, the top of the supporting seat 7 is fixedly connected with a closing touch switch 8, the opening touch switch 10 and the closing touch switch 8 are both electrically connected with the controller 9, and the bottom of the counterweight extrusion block 6 is movably contacted with the touch end of the closing touch switch 8, the starting touch switch 10 is positioned above the counterweight extrusion block 6 and is matched with the counterweight extrusion block 6;

the discharge liquid level adjusting mechanism comprises an internal thread sleeve 11 which is rotatably arranged on the inner wall of the top end of a vertical pipe 2, a screw rod 12 is sleeved in the internal thread sleeve 11, the bottom end of the screw rod 12 extends to the lower part of the internal thread sleeve 11 and is fixedly connected with the top part of an adjusting plate 5, a first bevel gear 16 is arranged on the internal thread sleeve 11 in a welding sleeve mode, a second bevel gear 13 is meshed on the left side of the first bevel gear 16, a rotating shaft 14 is fixedly connected on the left side of the second bevel gear 13, and the left end of the rotating shaft 14 extends to the left side of the vertical pipe 2 and is fixedly connected with a knob 15. the utility model has the advantages of reasonable design and convenient use, is convenient to automatically and timely open the electromagnetic valve 1 for pollution discharge when a large amount of polluted liquid in the oil-gas separator 100, does not need to observe and manually open, saves time and labor, is convenient for personnel to adjust the liquid level during automatic pollution discharge according to use requirements, and meets the use requirements, is beneficial to use.

In the utility model, the inner wall of the bottom of the oil-gas separator 100 is provided with a mounting hole, the inner wall of the mounting hole is fixedly connected with the outer side of the standpipe 2, the blow-off pipe 101 is composed of an upper pipe and a lower pipe, the top end of the upper pipe is communicated and fixed with the bottom of the oil-gas separator 100, the bottom end of the lower pipe is communicated and fixed with the top of the foul solution tank 102, the bottom end of the upper pipe is fixedly connected with the water inlet end of the solenoid valve 1, the top end of the lower pipe is fixedly connected with the water outlet end of the solenoid valve 1, the inner wall of the top of the standpipe 2 is provided with a square hole, the outer side of the square rod 3 is bonded and sleeved with a sealing rubber sheet, the outer side of the sealing rubber sheet is connected with the inner wall of the square hole in a sliding way, the gravity of the counter weight extrusion block 6 is smaller than the buoyancy of the water received by the hollow floating plate 4, the inner walls of the standpipe 2 are fixedly connected with T-shaped slide rails 17, the two sides of the adjusting plate 5 are provided with T-shaped chutes with openings at the top and the bottom, the T-shaped sliding groove is connected with a corresponding T-shaped sliding rail 17 in a sliding way, a first round hole is arranged at the top of the adjusting plate 5, the square rod 3 is positioned in the first round hole and is not contacted with the inner wall of the first round hole, a round groove is arranged on the inner wall of the top end of the vertical pipe 2, two first bearings are fixedly sleeved in the round groove, the inner ring of each first bearing is welded and sleeved with the outer side of the internal thread sleeve 11, a second round hole is arranged on the inner wall of the left side of the vertical pipe 2, and the second bearing is fixedly sleeved in the second round hole, and the inner ring of the second bearing is fixedly sleeved with the outer side of the rotating shaft 14, the utility model has reasonable design and convenient use, is convenient for automatically and timely opening the electromagnetic valve 1 for discharging sewage when more dirty liquid exists in the oil-gas separator 100, does not need to be observed by personnel and manually opened, saves time and labor, and the liquid level of personnel when being convenient for adjust automatic blowdown according to the user demand satisfies the user demand, is favorable to using.

The working principle is as follows: when the oil-gas separator 100 is used, along with the separation of oil and gas by the oil-gas separator 100, when the amount of dirty liquid in the oil-gas separator 100 increases, the water level of the dirty liquid rises and can float and support the hollow floating plate 4, under the condition that the buoyancy of the dirty liquid increases to the hollow floating plate 4, the hollow floating plate 4 moves upwards and drives the square rod 3 to move upwards, the square rod 3 drives the counterweight pressing block 6 to move upwards, the counterweight pressing block 6 moves upwards to be in contact with and press the touch end for opening the touch switch 10, the touch switch 10 is opened at the moment, the touch switch 10 is opened to transmit an opening signal to the controller 9, the controller 9 controls the electromagnetic valve 1 to be opened, at the moment, the dirty liquid in the oil-gas separator 100 is discharged into the dirty liquid tank 102 downwards through the sewage discharge pipe 101 and the electromagnetic valve 1, along with the descending of the dirty liquid caused during sewage discharge, the buoyancy supporting height of the hollow floating plate 4 is reduced, at the moment, under the action of self gravity, the counterweight pressing block 6 moves downwards and drives the hollow floating plate 4 to move downwards through the square rod 3, the counterweight extrusion block 6 downwards touches the touch end of the touch switch 8, at the moment, the touch switch 8 is closed and transmits a closing signal to the controller 9, the controller 9 controls the electromagnetic valve 1 to be closed and stops sewage discharge, so that the electromagnetic valve 1 can be automatically and timely opened for sewage discharge when more dirty liquid exists in the oil-gas separator 100, the observation and manual opening of personnel are not needed, and time and labor are saved;

when the liquid level of the discharged sewage liquid needs to be adjusted according to the use requirement, the knob 15 is rotated in the forward direction at the moment, the knob 15 drives the second bevel gear 13 to rotate through the rotating shaft 14, the second bevel gear 13 drives the internal thread sleeve 11 to rotate through the first bevel gear 16 meshed with the second bevel gear, the internal thread sleeve 11 rotates to drive the screw 12 to move downwards, the screw 12 drives the adjusting plate 5 to slide downwards on the two T-shaped sliding rails 17, the adjusting plate 5 drives the starting touch switch 10 to move downwards, the height of the starting touch switch 10 changes at the moment, the distance between the starting touch switch 10 and the counterweight extrusion block 6 changes, and therefore the height of the starting touch of the electromagnetic valve 1 slides, the liquid level during pollution discharge can be changed, and the aim of adjusting the discharged liquid level according to the actual requirement is achieved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An automatic recovery device for compressed natural gas to be delivered outside comprises an automatic recovery device body, wherein the automatic recovery device body comprises an oil-gas separator (100), a dirty liquid tank (102) and a sewage discharge pipe (101) which is communicated and fixed between the oil-gas separator (100) and the dirty liquid tank (102), and is characterized in that an electromagnetic valve (1) is arranged on the sewage discharge pipe (101), an adjustable automatic sewage discharge device matched with the electromagnetic valve (1) is arranged on the oil-gas separator (100), the adjustable automatic sewage discharge device comprises a vertical pipe (2) embedded on the inner wall of the bottom of the oil-gas separator (100), the top end of the vertical pipe (2) is provided with a plugging mechanism, and the bottom end of the vertical pipe (2) extends to the lower part of the oil-gas separator (100);

the vertical pipe (2) is provided with an automatic sewage draining mechanism matched with the electromagnetic valve (1), and the vertical pipe (2) is provided with a discharge liquid level adjusting mechanism matched with the automatic sewage draining mechanism.

2. The automatic recycling device for compressed export natural gas according to claim 1, wherein the automatic blowdown mechanism comprises a square rod (3) disposed in the vertical pipe (2), the top end of the square rod (3) extends to the upper side of the vertical pipe (2) and is fixedly connected with a hollow floating plate (4), the bottom end of the square rod (3) is fixedly connected with a counterweight extrusion block (6), the right side of the vertical pipe (2) is fixedly provided with a controller (9) and a storage battery, both the controller (9) and the electromagnetic valve (1) are electrically connected with the storage battery, the controller (9) is electrically connected with the electromagnetic valve (1), the same adjusting plate (5) is slidably mounted between the inner walls of the two sides of the vertical pipe (2), the adjusting plate (5) is movably sleeved on the square rod (3), the bottom left side of the adjusting plate (5) is fixedly connected with an opening touch switch (10), the left inner wall of the vertical pipe (2) is fixedly connected with a supporting seat (7), the top of the supporting seat (7) is fixedly connected with a closing touch switch (8), the opening touch switch (10) and the closing touch switch (8) are electrically connected with the controller (9), the bottom of the counterweight extrusion block (6) is in movable contact with a touch end of the closing touch switch (8), and the opening touch switch (10) is located above the counterweight extrusion block (6) and matched with the counterweight extrusion block (6).

3. The automatic recovery device for the compressed natural gas exported outside according to claim 1, wherein the discharge level adjusting mechanism comprises an internally threaded sleeve (11) rotatably mounted on the inner wall of the top end of the vertical pipe (2), a screw (12) is sleeved in the internally threaded sleeve (11), the bottom end of the screw (12) extends to the lower part of the internally threaded sleeve (11) and is fixedly connected with the top of the adjusting plate (5), a first bevel gear (16) is welded on the internally threaded sleeve (11), a second bevel gear (13) is meshed on the left side of the first bevel gear (16), a rotating shaft (14) is fixedly connected on the left side of the second bevel gear (13), and a knob (15) is fixedly connected on the left end of the rotating shaft (14) and extends to the left side of the vertical pipe (2).

4. The automatic recovery device for the compressed natural gas for external transportation according to claim 1, wherein a mounting hole is formed in the inner wall of the bottom of the oil-gas separator (100), the inner wall of the mounting hole is fixedly connected with the outer side of the vertical pipe (2), the sewage discharge pipe (101) comprises an upper pipe and a lower pipe, the top end of the upper pipe is communicated and fixed with the bottom of the oil-gas separator (100), the bottom end of the lower pipe is communicated and fixed with the top of the sewage tank (102), the bottom end of the upper pipe is fixedly connected with the water inlet end of the electromagnetic valve (1), and the top end of the lower pipe is fixedly connected with the water outlet end of the electromagnetic valve (1).

5. The automatic recovery device for the compressed natural gas for external transportation according to claim 2, wherein a square hole is formed in the inner wall of the top of the vertical pipe (2), a sealing rubber sheet is bonded and sleeved on the outer side of the square rod (3), the outer side of the sealing rubber sheet is connected with the inner wall of the square hole in a sliding mode, and the gravity of the counterweight extrusion block (6) is smaller than the buoyancy of the hollow floating plate (4) when the counterweight extrusion block is subjected to water.

6. The automatic recovery device for the compressed natural gas for export according to claim 2, wherein the inner walls of the two sides of the vertical pipe (2) are fixedly connected with T-shaped slide rails (17), the two sides of the adjusting plate (5) are respectively provided with T-shaped slide grooves with top and bottom arranged for opening, the T-shaped slide grooves are slidably connected with the corresponding T-shaped slide rails (17), the top of the adjusting plate (5) is provided with a first round hole, and the square rod (3) is located in the first round hole and is not in contact with the inner wall of the first round hole.

7. The automatic recovery device for compressed natural gas exported according to claim 3, wherein the inner wall of the top end of the vertical pipe (2) is provided with a circular groove, two first bearings are fixedly sleeved in the circular groove, and the inner rings of the first bearings are welded and sleeved with the outer side of the internally threaded sleeve (11).

8. The automatic recovery device for compressed natural gas exported according to claim 3, wherein the inner wall of the vertical tube (2) is provided with a second circular hole, a second bearing is fixedly sleeved in the second circular hole, and the inner ring of the second bearing is fixedly sleeved on the outer side of the rotating shaft (14).