CN112855511B

CN112855511B - Natural gas hydraulic compressor

Info

Publication number: CN112855511B
Application number: CN202011627369.7A
Authority: CN
Inventors: 王义官; 吴宗荣; 刘川
Original assignee: Zigong Tongda Machinery Manufacturing Co ltd
Current assignee: Zigong Tongda Machinery Manufacturing Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2023-05-12
Anticipated expiration: 2040-12-30
Also published as: CN112855511A

Abstract

The invention discloses a natural gas hydraulic compressor, which comprises a natural gas pipeline, wherein the natural gas pipeline comprises a main pipeline, one end of the main pipeline is connected with an air inlet, the other end of the main pipeline is connected with a plurality of air outlets, at least one air outlet is a high-pressure air outlet, at least one air outlet is a medium-pressure air outlet, the main pipeline is connected with a plurality of hydraulic cylinders, a ball valve is arranged at the air outlet of the main pipeline, and an air cooler is further arranged on the main pipeline; through the technical scheme, the natural gas compressor for the substation has the advantages that the performance of the natural gas compressor for the substation can be improved through the integral design, the adaptability is enhanced, the energy-saving effect is better, the integral arrangement is reasonable, the structure is more compact, and the energy-saving performance is better.

Description

Natural gas hydraulic compressor

Technical Field

The invention relates to the field of mechanical equipment, in particular to a natural gas hydraulic compressor.

Background

The existing gas compression technology driven by mechanical transmission of the natural gas hydraulic compressor has higher energy consumption and low efficiency, and a new natural gas hydraulic compressor is necessary to be designed in order to reduce the allowable cost of the gas station.

Disclosure of Invention

In order to solve the problems, the invention provides the natural gas hydraulic compressor, which has the advantages of improving the performance of the natural gas compressor for the substation through the integral design, enhancing the adaptability, enabling the energy-saving effect to be better, being reasonable in integral arrangement, being more compact in structure and being better in energy-saving performance.

The technical scheme of the invention is as follows:

the utility model provides a natural gas hydraulic compressor, includes the natural gas pipeline, the natural gas pipeline includes the main pipeline, the one end of main pipeline is connected with the air inlet, the other end of main pipeline is connected with a plurality of gas outlets, and at least one gas outlet is the high-pressure air outlet, and at least one gas outlet is the middling pressure gas outlet, be connected with a plurality of pneumatic cylinders on the main pipeline, the gas outlet department of main pipeline is equipped with the ball valve, still be equipped with the forced air cooler on the main pipeline.

The working principle of the technical scheme is as follows:

natural gas enters a main pipeline from an air inlet, is compressed by a hydraulic cylinder, is cooled by an air cooler, and is regulated to a high-pressure air outlet or a medium-pressure air outlet by a ball valve to flow out.

Through the technical scheme, the natural gas compressor for the substation has the advantages that the performance of the natural gas compressor for the substation can be improved through the integral design, the adaptability is enhanced, the energy-saving effect is better, the integral arrangement is reasonable, the structure is more compact, and the energy-saving performance is better.

In a further technical scheme, the inside of pneumatic cylinder is equipped with two pistons, two the pneumatic cylinder divide into three cavity with the piston, three the cavity is first air cavity, second air cavity and oil pocket respectively, first air cavity and second air cavity are located the opposite both sides of oil pocket, first air cavity and second air cavity are equipped with admission valve and discharge valve respectively, the oil pocket is equipped with oil inlet and oil-out.

The air inlet valve is opened, air enters the first air cavity and the second air cavity from the air inlet valve respectively, the oil inlet and the oil outlet are controlled by the three-position four-way electromagnetic reversing valve, the piston is hydraulically driven to compress the air, the exhaust valve is opened, and the compressed air flows out through the pipeline; according to the technical scheme, the piston rod connected with the piston is omitted, the piston separates the cylinder barrel into the air cavity and the oil cavity, the piston is hydraulically driven to realize air compression, the structure is simplified, the coaxiality precision and the manufacturing difficulty of the hydraulic cylinder and the piston are reduced, the piston is not affected by the coaxiality, the piston has the advantages of no eccentric wear, prolonged service life of a piston sealing element, reduced maintenance workload and reduced operation cost.

In a further technical scheme, two side walls of the oil cavity are respectively provided with a stop block for preventing the two pistons from sliding.

The stop block is arranged to prevent the piston from sliding through the oil inlet or the oil outlet and avoid gas from entering the hydraulic pipeline.

In a further technical scheme, buffer plungers are arranged on the air cavity sides of the two pistons, and buffer cavities matched with the buffer plungers are respectively arranged on the opposite sides of the hydraulic cylinder;

and displacement sensors are respectively arranged on the two pistons.

Through setting up buffering plunger and cushion chamber, reduce the operational noise of pneumatic cylinder, displacement sensor simultaneously is convenient for monitor the motion of piston to control the switching-over of switching-over valve when debugging.

In a further technical scheme, one end of the main pipeline, which is close to the air inlet valve of each hydraulic cylinder, is respectively provided with an oil-water separator, the main pipeline is also provided with an oil removal filter, the oil removal filter is positioned at one side of the main pipeline, which is close to the air outlet, and all the oil-water separators and the oil removal filters are connected with a sewage outlet through sewage pipelines;

and one end of the main pipeline, which is close to the air inlet, is connected with a low-pressure air outlet through an emptying pipeline.

Natural gas enters a main pipeline from an air inlet, is filtered for the first time through an oil-water separator, then enters a hydraulic cylinder for compression, if the pressure of the natural gas required is high, the compressed gas enters a next oil-water separator for secondary filtration, then enters the next hydraulic cylinder for secondary compression, the steps are repeated for a plurality of times, the natural gas compressed for a plurality of times enters an oil removal filter for final filtration, the impurities filtered for a plurality of times are discharged through a drain outlet of a drain pipeline, a plurality of valves are arranged at an outlet of the main pipeline, the gas under different compression conditions is distributed through the mutual matching of the valves, and is discharged from a high-pressure outlet and a medium-pressure outlet respectively, and if the natural gas does not need to be compressed, the gas entering from the air inlet is directly discharged through a low-pressure outlet of a drain pipeline; through the technical scheme, the hydraulic cylinder power distribution device has the advantages of being high in working efficiency, low in energy consumption, larger in pressurizing flow and capable of removing oil-water mixture in gas, and the power of the hydraulic cylinder is distributed according to requirements.

In a further technical scheme, a plurality of safety valves are arranged on the pipelines of the main pipeline, and all the safety valves are connected with a vent through the safety pipeline.

And a safety valve is arranged to prevent safety accidents caused by overhigh pressure in the main pipeline.

In a further technical scheme, oil chambers of all the hydraulic cylinders are connected with an oil tank, the oil tank comprises an oil outlet chamber and an oil inlet chamber, the oil outlet chamber and the oil inlet chamber are connected through a first one-way valve, the flow direction of the first one-way valve faces the oil outlet chamber, the oil inlet chamber is provided with an oil inlet, and the oil inlet is connected with a filter through a pipeline;

the filter is internally provided with a first flow passage communicated with the oil inlet cavity and the oil inlet, the middle part of the filter is provided with a rotary disc, the first flow passage in the rotary disc is annular and is provided with a plurality of filter screens, and the bottom of the first flow passage is provided with a second one-way valve;

the top of the oil outlet chamber is provided with a through hole, a cooling rod is arranged at the through hole, and a groove for accommodating the cooling rod is arranged in the filter;

and a micro differential pressure controller is also arranged in the oil tank.

The method comprises the steps that backflow hydraulic oil enters a filter from an oil inlet, enters a rotary table along a first flow channel in the filter, the first flow channel in the rotary table is round, liquid is buffered, the hydraulic oil is prevented from entering an oil inlet cavity to generate bubbles at an excessively high flow rate, slag is filtered by a filter screen and then enters the oil inlet cavity, a cooling rod is inserted into the filter, the temperature of the hydraulic oil is reduced, the treated hydraulic oil enters an oil outlet cavity through a first one-way valve, a micro-differential pressure controller is used for monitoring a sealing ring in a hydraulic cylinder, when the sealing ring is aged or damaged, natural gas enters the hydraulic oil tank along a pipeline through the damaged or aged sealing ring under the action of high pressure, pressure fluctuation can occur in the hydraulic oil tank, and the micro-differential pressure controller detects the pressure fluctuation in the hydraulic oil tank so as to facilitate discharge of potential safety hazards; through the technical scheme, the hydraulic oil cooling and filtering device has the advantage of being capable of cooling and filtering hydraulic oil.

In a further technical scheme, the air cooler comprises a heat exchange device, a channel for natural gas to circulate is arranged in the heat exchange device, a plurality of second flow channels for cooling water to pass through are arranged in the air cooler, and a plurality of fans are arranged at the bottom and the top of the air cooler; the air cooler also comprises a water tank, wherein the water tank is provided with a water inlet and a water outlet, and the water inlet, the water outlet and all flow channels form a closed loop.

The compressed natural gas enters a heat exchange device, a second flow passage in the air cooler is filled with water, a part of heat is taken away through the flowing of cooling water, and the heat conduction is accelerated by fans at the bottom and the top of the air cooler, so that the cooling speed is accelerated; through the technical scheme, the natural gas temperature control device has the advantages of reducing the natural gas temperature, preventing the phenomenon of pipe explosion caused by the overhigh natural gas temperature, and avoiding potential safety hazards.

In a further technical scheme, the high-pressure air outlet and the medium-pressure air outlet are regulated through a ball valve, a rotary valve is arranged at the junction of three-way pipelines of the ball valve, the three-way pipeline of the ball valve is respectively connected with a main pipeline, the high-pressure air outlet and the medium-pressure air outlet, a third flow passage communicated with the main pipeline, the high-pressure air outlet and the medium-pressure air outlet is arranged in the rotary valve, a valve is arranged at the position, close to the medium-pressure air outlet, of the third flow passage of the rotary valve, the valve is in sliding connection with the third flow passage, the sliding direction of the valve is the same as the height of the third flow passage, and the rotary valve and the valve are pneumatically driven.

The channels in the ball valve are communicated with the main pipeline, the high-pressure air outlet and the medium-pressure air outlet, any two of the channels are communicated through the rotary valve, when natural gas passes through the channels, the valve is arranged at the inlet of the third channel, so that the natural gas cannot collide on the third channel, if necessary, the three channels in the rotary valve are respectively communicated with the three channels in the ball valve, and then the valve is opened, so that the three-way function can be realized; through the technical scheme, the natural gas energy-saving device has the advantage of preventing the energy of the natural gas from being reduced in the conveying process.

In a further technical scheme, the natural gas hydraulic compressor further comprises a PLC controller, wherein the PLC controller is provided with a plurality of signal output ends and a plurality of signal input ends, and the signal output ends of the PLC controller are respectively connected with the signal input ends of the hydraulic cylinder, the oil tank, the air cooler and the ball valve;

and the signal output end of the micro differential pressure controller and the signal output end of the displacement sensor are respectively connected with the signal input end of the PLC.

The PLC controller mainly comprises a programmable controller, an A/D module, a touch screen, a circuit breaker, an air switch, a soft starter, an alternating current contactor, an intermediate relay, a thermal relay, a transformer, a direct current power supply, a voltmeter, an ammeter, a knob switch, a button, a wiring terminal and the like, man-machine conversation can be realized through the touch screen, namely, real-time display of operation data, parameter setting, manual operation and the like can be realized through the touch screen, the PLC is provided with 2 RS485 communication/programming ports, one port is connected with the touch screen, the other port is reserved for a user to use as an upper computer, and communication protocol parameters can be modified and set in the touch screen; the hydraulic cylinder, the oil tank, the air cooler and the ball valve are directly controlled by the PLC, so that automation is realized, and meanwhile, the data of the displacement sensor and the micro-differential pressure controller are conveniently read.

The beneficial effects of the invention are as follows:

1. through the technical scheme, the energy-saving gas compressor for the substation has the advantages that the performance of the natural gas compressor for the substation can be improved through the integral design, the adaptability is enhanced, the energy-saving effect is better, the integral arrangement is reasonable, the structure is more compact, and the energy-saving performance is better;

2. according to the technical scheme, the piston rod connected with the piston is omitted, the piston separates the cylinder barrel into the air cavity and the oil cavity, the piston is hydraulically driven to realize air compression, the structure is simplified, the coaxiality precision and the manufacturing difficulty of the hydraulic cylinder and the piston are reduced, the piston is not influenced by the coaxiality, the piston has the advantages of no eccentric wear, prolonged service life of a piston sealing element, reduced maintenance workload and reduced operation cost;

3. the stop block is arranged to prevent the piston from sliding through the oil inlet or the oil outlet and prevent gas from entering the hydraulic pipeline;

4. the buffer plunger and the buffer cavity are arranged, so that the working noise of the hydraulic cylinder is reduced, and meanwhile, the displacement sensor is convenient for monitoring the movement of the piston, so that the reversing of the reversing valve is controlled during debugging;

5. through the technical scheme, the hydraulic cylinder power distribution device has the advantages of being high in working efficiency, low in energy consumption, larger in pressurizing flow and capable of removing oil-water mixture in gas, and the power of the hydraulic cylinder is distributed according to requirements;

6. a safety valve is arranged to prevent safety accidents caused by overhigh pressure in the main pipeline;

7. through the technical scheme, the hydraulic oil cooling and filtering device has the advantage of being capable of cooling and filtering hydraulic oil;

8. through the technical scheme, the natural gas temperature control device has the advantages of reducing the natural gas temperature, preventing the phenomenon of pipe explosion caused by the overhigh natural gas temperature, and avoiding potential safety hazards;

9. through the technical scheme, the natural gas energy-saving device has the advantage of preventing the energy of the natural gas from being reduced in the conveying process;

10. the hydraulic cylinder, the oil tank, the air cooler and the ball valve are directly controlled by the PLC, so that automation is realized, and meanwhile, the data of the displacement sensor and the micro-differential pressure controller are conveniently read.

Drawings

FIG. 1 is a schematic view of the overall structure of a natural gas hydraulic compressor according to an embodiment of the present invention;

FIG. 2 is a schematic view of a hydraulic cylinder according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the fuel tank according to the embodiment of the present invention;

FIG. 4 is a schematic diagram of the operation of the fuel tank according to the embodiment of the present invention;

FIG. 5 is a schematic view of a turntable according to an embodiment of the present invention;

FIG. 6 is a schematic view of a filter according to an embodiment of the present invention;

FIG. 7 is a schematic view of an air cooler according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the operation of the air cooler water tank according to an embodiment of the present invention;

FIG. 9 is a schematic view of a ball valve according to an embodiment of the present invention;

FIG. 10 is a second schematic structural view of a ball valve according to an embodiment of the present invention;

FIG. 11 is a front view of a ball valve according to an embodiment of the present invention;

fig. 12 is a signal flow diagram of a PLC controller according to an embodiment of the present invention.

Reference numerals illustrate:

10. a main pipeline; 101. an air inlet; 102. a high pressure outlet; 103. a medium pressure air outlet; 11. an oil-water separator; 12. a deoiling filter; 13. a blow-down line; 131. a sewage outlet; 14. a vent line; 141. a low pressure outlet; 15. a safety line; 151. a safety valve; 152. an air vent; 20. a hydraulic cylinder; 201. a first air chamber; 202. a second air chamber; 203. an oil chamber; 21. a piston; 22. an intake valve; 23. an exhaust valve; 24. an oil inlet; 25. an oil outlet; 26. buffering the plunger; 27. a buffer chamber; 28. a stop block; 29. a displacement sensor; 30. an oil tank; 301. an oil inlet chamber; 302. an oil outlet chamber; 31. a first one-way valve; 32. a filter; 321. a turntable; 322. a first flow passage; 323. a groove; 324. a second one-way valve; 33. a cooling bar; 34. a power device; 35. a micro differential pressure controller; 40. an air cooler; 401. a heat exchange device; 402. a second flow passage; 41. a fan; 42. a water tank; 421. a third one-way valve; 422. a hydraulic pump; 50. a ball valve; 51. rotating the valve; 511. a third flow passage; 512. a valve; 60. and a PLC controller.

Detailed Description

Embodiments of the present invention are further described below with reference to the accompanying drawings.

Examples:

as shown in fig. 1-11, a natural gas hydraulic compressor comprises a natural gas pipeline, the natural gas pipeline comprises a main pipeline 10, one end of the main pipeline 10 is connected with an air inlet 101, the other end of the main pipeline 10 is connected with a plurality of air outlets, at least one air outlet is a high-pressure air outlet 102, at least one air outlet is a medium-pressure air outlet 103, a plurality of hydraulic cylinders 20 are connected to the main pipeline 10, a ball valve 50 is arranged at the air outlet of the main pipeline 10, and an air cooler 40 is further arranged on the main pipeline 10.

The working principle of the technical scheme is as follows:

natural gas enters the main pipeline 10 from the gas inlet 101, is compressed by the hydraulic cylinder 20, is cooled by the air cooler 40, and is regulated to the high-pressure gas outlet 102 or the medium-pressure gas outlet 103 by the ball valve 50 to flow out.

In the embodiment, the external dimension of the natural gas hydraulic compressor is 4500 mm multiplied by 2500 mm multiplied by 2800 mm, the air inlet pressure is 3-20MPa, the air inlet temperature is-20-40 ℃, the air outlet pressure is 20-25MPa, and the air outlet amount is 360-2500Nm3/d.

In this embodiment, the hydraulic cylinder 20 is vertical, and the piston 21 is prevented from being worn by gravity.

In this embodiment, through above-mentioned technical scheme, have through the performance that global design can promote the natural gas compressor for the substation, strengthen adaptability for energy-conserving effect is better, and global arrangement is reasonable, and the structure is compacter, and energy-conserving performance is better advantage.

In another embodiment, as shown in fig. 2, two pistons 21 are disposed inside the hydraulic cylinder 20, the two pistons 21 divide the hydraulic cylinder 20 into three chambers, the three chambers are a first air chamber 201, a second air chamber 202 and an oil chamber 203, the first air chamber 201 and the second air chamber 202 are located at opposite sides of the oil chamber 203, the first air chamber 201 and the second air chamber 202 are respectively provided with an air inlet valve 22 and an air outlet valve 23, and the oil chamber 203 is provided with an oil inlet 24 and an oil outlet 25.

In this embodiment, the power device 34 composed of a plurality of large-flow variable drive pumps and a plurality of high-speed small-torque hydraulic motors is arranged at the oil outlet 25, the power device 34 is composed of a plurality of large-flow variable drive pumps and a plurality of high-speed small-torque hydraulic motors, and the whole system realizes proportional control, constant power control and safe pressure control under different working modes, and realizes simultaneous adjustment of multiple pumps and multiple motors.

In this embodiment, the filter 32 and the cooling rod 33 are detachably connected to the oil tank 30, respectively, so that the filter 32 and the cooling rod 33 can be replaced conveniently.

In the embodiment, the air inlet valve 22 is opened, air enters the first air cavity 201 and the second air cavity 202 from the air inlet valve 22 respectively, the oil inlet 24 and the oil outlet 25 are controlled by a three-position four-way electromagnetic reversing valve, the piston 21 is hydraulically driven to compress the air, the exhaust valve 23 is opened, and the compressed air flows out through the pipeline; according to the technical scheme, the piston 21 rod connected with the piston 21 is omitted, the piston 21 separates the cylinder barrel into the air outlet cavity and the oil cavity 203, the piston 21 is hydraulically driven to realize air compression, the structure is simplified, the coaxiality precision and the manufacturing difficulty of the hydraulic cylinder 20 and the piston 21 are reduced, the piston 21 is not affected by coaxiality, the piston 21 is free from eccentric wear, the service life of a sealing element of the piston 21 is prolonged, the maintenance workload is reduced, and the operation cost is reduced.

In another embodiment, as shown in fig. 2, two side walls of the oil chamber 203 are respectively provided with stoppers 28 for preventing the two pistons 21 from sliding.

In this embodiment, a stop 28 is provided to prevent the piston 21 from sliding past the oil inlet 24 or the oil outlet 25, preventing air from entering the hydraulic conduit.

In another embodiment, as shown in fig. 2, the air cavity sides of the two pistons 21 are provided with buffer plungers 26, and two opposite sides of the hydraulic cylinder 20 are respectively provided with buffer cavities 27 matched with the buffer plungers 26;

the two pistons 21 are also provided with displacement sensors 29, respectively.

In this embodiment, by providing the buffer plunger 26 and the buffer chamber 27, the operating noise of the hydraulic cylinder 20 is reduced, while the displacement sensor 29 facilitates monitoring the movement of the piston 21 to control the reversing of the reversing valve at the time of debugging.

In another embodiment, as shown in fig. 1, an oil-water separator 11 is respectively disposed at one end of the main pipeline 10 near the air inlet valve 22 of each hydraulic cylinder 20, an oil removal filter 12 is further disposed on the main pipeline 10, the oil removal filter 12 is disposed at one side of the main pipeline 10 near the air outlet, and all the oil-water separators 11 and the oil removal filters 12 are connected with a drain 131 through a drain pipeline 13;

the end of the main pipeline 10 near the air inlet 101 is connected with a low-pressure air outlet 141 through an air vent pipeline 14.

In this embodiment, the main pipeline 10 is provided with a plurality of pressure sensors and temperature sensors, and the signal output ends of the pressure sensors and the signal output ends of the temperature sensors are respectively connected with the signal input end of the PLC controller 60, so as to facilitate remote monitoring.

In this embodiment, natural gas enters the main pipeline 10 from the gas inlet 101, is filtered for the first time by the oil-water separator 11, then enters the hydraulic cylinder 20 for compression, if the pressure of the required natural gas is high, the compressed gas enters the next oil-water separator 11 for secondary filtration, then enters the next hydraulic cylinder 20 for secondary compression, the steps are repeated for a plurality of times, the natural gas compressed for a plurality of times enters the oil removal filter 12 for final filtration, the impurities filtered for a plurality of times are discharged through the drain outlet 131 of the drain pipeline 13, a plurality of valves 512 are arranged at the outlet of the main pipeline 10, the gas under different compression conditions is distributed through the mutual cooperation of the plurality of valves 512, and is discharged from the high-pressure gas outlet 102 and the medium-pressure gas outlet 103 respectively, and if the natural gas does not need to be compressed, the gas entering from the gas inlet 101 is directly discharged through the low-pressure gas outlet 141 of the drain pipeline 14; through the technical scheme, the hydraulic cylinder 20 has the advantages of being high in working efficiency, low in energy consumption, larger in pressurizing flow and capable of removing oil-water mixture in gas, and the power of the hydraulic cylinder 20 is distributed according to requirements.

In another embodiment, as shown in fig. 1, a plurality of safety valves 151 are disposed on the pipe of the main pipeline 10, and all the safety valves 151 are connected to a vent 152 through a safety pipeline 15.

In this embodiment, a safety valve 151 is provided to prevent an accident from occurring due to an excessive pressure in the main pipeline 10.

In another embodiment, as shown in fig. 3-6, the oil chambers 203 of all the hydraulic cylinders 20 are connected with an oil tank 30, the oil tank 30 comprises an oil outlet chamber 203 chamber and an oil inlet chamber 203 chamber, the oil outlet chamber 203 chamber and the oil inlet chamber 203 chamber are connected through a first one-way valve 31, the flow direction of the first one-way valve 31 faces the oil outlet chamber 203 chamber, the oil inlet chamber 203 chamber is provided with an oil inlet 24, and the oil inlet 24 is connected with a filter 32 through a pipeline;

a first flow passage 322 which is communicated with the oil inlet cavity 203 and the oil inlet 24 is arranged in the filter 32, a rotary table 321 is arranged in the middle of the filter 32, the first flow passage 322 in the rotary table 321 is annular and is provided with a plurality of filter screens, and a second one-way valve 324 is arranged at the bottom of the first flow passage 322;

a through hole is formed in the top of the oil outlet cavity 203, a cooling rod 33 is arranged at the through hole, and a groove 323 for accommodating the cooling rod 33 is formed in the filter 32;

a micro differential pressure controller 35 is also provided in the oil tank 30.

In this embodiment, the return hydraulic oil enters the filter 32 from the oil inlet 24, enters the turntable 321 along the first flow passage 322 in the filter 32, the first flow passage 322 in the turntable 321 is circular, buffers the liquid, prevents the hydraulic oil from entering the oil inlet cavity 203 chamber too quickly, and then enters the oil inlet cavity 203 chamber after passing through the filter screen to filter residues, the cooling rod 33 is inserted into the filter 32, reduces the temperature of the hydraulic oil, the treated hydraulic oil enters the oil outlet cavity 203 chamber through the first one-way valve 31, the micro-differential pressure controller 35 is used for monitoring the sealing ring in the hydraulic cylinder 20, when the sealing ring is aged or damaged, the natural gas enters the hydraulic oil tank 30 along the pipeline through the damaged or aged sealing ring under the action of high pressure, the pressure fluctuation occurs in the hydraulic oil tank 30, and the micro-differential pressure controller 35 detects the pressure fluctuation in the hydraulic oil tank 30, thereby facilitating the discharge of potential safety hazards; through the technical scheme, the hydraulic oil cooling and filtering device has the advantage of being capable of cooling and filtering hydraulic oil.

In another embodiment, as shown in fig. 7 to 8, the air cooler 40 includes a heat exchange device 401, a channel through which natural gas flows is provided in the heat exchange device 401, a plurality of second flow channels 402 through which cooling water passes are provided in the air cooler 40, and a plurality of fans 41 are provided at the bottom and the top of the air cooler 40; the air cooler also comprises a water tank 42, wherein the water tank 42 is provided with a water inlet and a water outlet, and the water inlet, the water outlet and all flow channels form a closed loop.

In this embodiment, a third check valve 421 is disposed at the water inlet and the water outlet of the water tank 42, respectively, to prevent the coolant from flowing back.

In this embodiment, a hydraulic pump 422 is disposed at the water outlet of the water tank 42 to ensure sufficient power.

In this embodiment, a refrigerating device is provided in the water tank 42 for reducing the temperature of the coolant.

In this embodiment, compressed natural gas enters the heat exchange device 401, and the second flow channel 402 in the air cooler 40 is filled with water, so that part of heat is taken away by cooling water, and the fans 41 at the bottom and the top of the air cooler 40 accelerate heat conduction, so that the cooling speed is accelerated; through the technical scheme, the natural gas temperature control device has the advantages of reducing the natural gas temperature, preventing the phenomenon of pipe explosion caused by the overhigh natural gas temperature, and avoiding potential safety hazards.

In another embodiment, as shown in fig. 9-11, the high pressure air outlet 102 and the medium pressure air outlet 103 are regulated by a ball valve 50, a rotary valve 51 is arranged at the junction of three-way pipes of the ball valve 50, the three-way pipes of the ball valve 50 are respectively connected with the main pipeline 10, the high pressure air outlet 102 and the medium pressure air outlet 103, a third flow passage 511 which is communicated with the main pipeline 10, the high pressure air outlet 102 and the medium pressure air outlet 103 is arranged in the rotary valve 51, a valve 512 is arranged at the position, close to the medium pressure air outlet 103, of the rotary valve 51, the valve 512 is slidably connected with the third flow passage 511, the sliding direction of the valve is the same as the height of the third flow passage 511, and the rotary valve 51 and the valve 512 are pneumatically driven.

In this embodiment, the two passages of the ball valve 50, to which the main pipe 10 and the high pressure gas outlet 102 are connected, are positioned on the same straight line, so that natural gas is transported straight, and no energy loss is caused by collision.

In this embodiment, the turning part of the inner flow passage of the rotary valve 51 is smoothly transited, and the energy loss during impact is reduced by smoothly transiting the turning part of the inner flow passage of the rotary valve 51.

In this embodiment, the channels in the ball valve 50 are communicated with the main pipeline 10, the high-pressure air outlet 102 and the medium-pressure air outlet 103, any two of the channels are communicated through the rotary valve 51, when the natural gas passes through the channels, the valve 512 is arranged at the inlet of the third channel, so that the natural gas cannot strike the third channel, if necessary, the three channels in the rotary valve 51 are respectively communicated with the three channels in the ball valve 50, and then the valve 512 is opened, so that the three-way function can be realized; through the technical scheme, the natural gas energy-saving device has the advantage of preventing the energy of the natural gas from being reduced in the conveying process.

In another embodiment, as shown in fig. 12, the natural gas hydraulic compressor further includes a PLC controller 60, where the PLC controller 60 has a plurality of signal output terminals and a plurality of signal input terminals, and the signal output terminals of the PLC controller 60 are respectively connected to the signal input terminals of the hydraulic cylinder 20, the signal input terminal of the oil tank 30, the signal input terminal of the air cooler 40, and the signal input terminal of the ball valve 50;

the signal output end of the micro differential pressure controller 35 and the signal output end of the displacement sensor 29 are respectively connected with the signal input end of the PLC controller 60.

In this embodiment, the PLC controller 60 mainly comprises a programmable controller, an a/D module, a touch screen, a circuit breaker, an air switch, a soft starter, an ac contactor, an intermediate relay, a thermal relay, a transformer, a dc power supply, a voltmeter, an ammeter, a knob switch, a button, a wiring terminal, etc., and can realize man-machine conversation through the touch screen, that is, real-time display of operation data, setting of parameters, manual operation, etc., through the touch screen, the PLC itself has 2 RS485 communication/programming ports, one is connected with the touch screen, the other is reserved for a user to use as an upper computer, and the communication protocol parameters can be modified and set in the touch screen; by directly adopting the PLC to control the hydraulic cylinder 20, the oil tank 30, the air cooler 40 and the ball valve 50, automation is realized, and meanwhile, the data of the displacement sensor 29 and the micro-differential pressure controller 35 are conveniently read.

The foregoing examples merely illustrate specific embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims

1. The natural gas hydraulic compressor is characterized by comprising a natural gas pipeline, wherein the natural gas pipeline comprises a main pipeline, one end of the main pipeline is connected with an air inlet, the other end of the main pipeline is connected with a plurality of air outlets, at least one air outlet is a high-pressure air outlet, at least one air outlet is a medium-pressure air outlet, the main pipeline is connected with a plurality of hydraulic cylinders, a ball valve is arranged at the air outlet of the main pipeline, and an air cooler is further arranged on the main pipeline;

the hydraulic cylinder is internally provided with two pistons, the two pistons divide the hydraulic cylinder into three chambers, the three chambers are a first air cavity, a second air cavity and an oil cavity respectively, the first air cavity and the second air cavity are positioned on two opposite sides of the oil cavity, the first air cavity and the second air cavity are respectively provided with an air inlet valve and an air outlet valve, and the oil cavity is provided with an oil inlet and an oil outlet;

and two side walls of the oil cavity are respectively provided with a stop block for preventing the two pistons from sliding.

2. The natural gas hydraulic compressor of claim 1, wherein the air cavity sides of the two pistons are provided with buffer plungers, and the opposite sides of the hydraulic cylinder are respectively provided with buffer cavities matched with the buffer plungers;

and displacement sensors are respectively arranged on the two pistons.

3. The natural gas hydraulic compressor according to claim 1, wherein an oil-water separator is respectively arranged at one end of the main pipeline close to the air inlet valve of each hydraulic cylinder, an oil removal filter is further arranged on the main pipeline, the oil removal filter is positioned at one side of the main pipeline close to the air outlet, and all the oil-water separators and the oil removal filters are connected with a sewage outlet through sewage pipelines;

4. A natural gas hydraulic compressor as claimed in claim 1, wherein a plurality of relief valves are provided on the piping of the main pipeline, all of the relief valves being connected to a vent via the relief pipeline.

5. The natural gas hydraulic compressor of claim 1, wherein oil chambers of all the hydraulic cylinders are connected with an oil tank, the oil tank comprises an oil outlet chamber and an oil inlet chamber, the oil outlet chamber and the oil inlet chamber are connected through a first one-way valve, the flow direction of the first one-way valve faces the oil outlet chamber, the oil inlet chamber is provided with an oil inlet, and the oil inlet is connected with a filter through a pipeline;

and a micro differential pressure controller is also arranged in the oil tank.

6. The natural gas hydraulic compressor according to claim 1, wherein the air cooler comprises a heat exchange device, a channel for natural gas to circulate is arranged in the heat exchange device, a plurality of second flow channels for cooling water to pass through are arranged in the air cooler, and a plurality of fans are arranged at the bottom and the top of the air cooler; the air cooler also comprises a water tank, wherein the water tank is provided with a water inlet and a water outlet, and the water inlet, the water outlet and all flow channels form a closed loop.

7. The natural gas hydraulic compressor according to claim 1, wherein the high-pressure air outlet and the medium-pressure air outlet are regulated by ball valves, the junction of three-way pipelines of the ball valves is provided with rotary valves, the three-way pipelines of the ball valves are respectively connected with a main pipeline, the high-pressure air outlet and the medium-pressure air outlet, third flow passages which are communicated with the main pipeline, the high-pressure air outlet and the medium-pressure air outlet are arranged in the rotary valves, valves are arranged at the third flow passages of the rotary valves close to the medium-pressure air outlet, the valves are in sliding connection with the third flow passages, the sliding direction of the valves is the same as the height of the third flow passages, and the rotary valves and the valves are pneumatically driven.

8. The natural gas hydraulic compressor of claim 5, further comprising a PLC controller having a plurality of signal outputs and a plurality of signal inputs, the signal outputs of the PLC controller being respectively connected to the signal inputs of the hydraulic cylinder, the signal input of the oil tank, the signal input of the air cooler, and the signal input of the ball valve;