CN117006406B - Hydraulic compressor device for natural gas filling substation and use method - Google Patents

Hydraulic compressor device for natural gas filling substation and use method Download PDF

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Publication number
CN117006406B
CN117006406B CN202311033234.1A CN202311033234A CN117006406B CN 117006406 B CN117006406 B CN 117006406B CN 202311033234 A CN202311033234 A CN 202311033234A CN 117006406 B CN117006406 B CN 117006406B
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cavity
hydraulic
primary
electromagnetic valve
oil
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CN117006406A (en
Inventor
胡葵
方红星
张志红
李伟峰
黄林
涂齐建
王欣
何顺安
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Wuhan Qidakang Energy Equipment Co ltd
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Wuhan Qidakang Energy Equipment Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • F15B2013/0448—Actuation by solenoid and permanent magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0352—Pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors
    • F17C2227/0164—Compressors with specified compressor type, e.g. piston or impulsive type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/063—Fluid distribution for supply of refueling stations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/065—Fluid distribution for refueling vehicle fuel tanks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention provides a hydraulic compressor device for a natural gas filling substation and a use method thereof, wherein the device comprises a tank car, an air inlet pipeline, a hydraulic compression main machine, a main hydraulic station component, an auxiliary hydraulic station, an exhaust pipeline, a gas filling machine and a PLC control system; the primary air inlet pipeline and the primary air outlet pipeline are communicated with the primary hydraulic compression host, the secondary air inlet pipeline and the secondary air outlet pipeline are communicated with the secondary hydraulic compression host, the oil inlet pipeline of the primary main hydraulic station assembly is communicated with the primary hydraulic compression host, the oil inlet pipeline of the secondary main hydraulic station assembly is communicated with the secondary hydraulic compression host, the oil inlet pipeline of the secondary hydraulic station is communicated with the primary hydraulic compression host, and the oil inlet pipeline of the secondary hydraulic station is communicated with the secondary hydraulic compression host. The device can rapidly meet the requirements of the terminal of the gas filling substation; through the arrangement of the auxiliary oil inlet and return pipeline, the main engine is reversely buffered, so that the oil way of the whole device operates more stably.

Description

Hydraulic compressor device for natural gas filling substation and use method
Technical Field
The invention belongs to the technical field of natural gas filling substation equipment, and particularly relates to a hydraulic compressor device for a natural gas filling substation and a use method thereof.
Background
The natural gas filling substation is used for compressing and storing natural gas and providing facilities for renting the natural gas and the like, compared with the traditional pipeline gas transmission, the tank car can quickly reach a destination to realize instant supply, so that the tank car is generally used as a gas source in the natural gas filling substation, the pressure of the natural gas in a newly manufactured tank car can reach 25MPa, the renting car can be directly provided for gas supply through a gas filling machine, the natural gas in the tank car still needs to be pressurized through compression equipment along with the use of the tank car and then is transmitted to the gas filling machine, and the hydraulic compressor adopts a liquid medium as a transmission medium.
The hydraulic compressors of the existing natural gas filling substation usually adopt two-stage compression, one hydraulic station is used for switching high and low pressure of oil ways of a primary host machine and a secondary host machine through two electromagnetic reversing valves, so that larger impact is generated, the electromagnetic reversing valves are easy to damage, and the primary host machine and the secondary host machine do not reversely buffer when reversing, sharp noise is generated, even the service life of a cylinder piston is influenced, and meanwhile, the natural gas filling substation occupies a larger space due to the limitation of a field, so that the occupied area of the hydraulic compressors in the prior art is larger.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a hydraulic compressor device for a natural gas filling substation and a use method thereof, which effectively solve the problems that an electromagnetic reversing valve is easy to damage, a primary host machine and a secondary host machine do not reversely buffer when reversing, sharp noise is generated and even the service life of a cylinder piston is influenced, and meanwhile, the natural gas filling substation occupies a larger space due to the limitation of a field, so that the occupation area of the hydraulic compressor in the prior art is larger.
In order to achieve the above purpose, the present invention provides the following technical solutions: the hydraulic compressor device for the natural gas filling substation comprises a tank car, a gas filling machine, a primary air inlet pipeline, a primary hydraulic compression main machine, a primary main hydraulic station component, a secondary hydraulic compression main machine, a secondary hydraulic station, a primary exhaust pipeline, a secondary air inlet pipeline, a secondary main hydraulic station component, a secondary exhaust pipeline and a PLC control system; the primary air inlet pipeline and the tank wagon are communicated, the primary air inlet pipeline and the primary air outlet pipeline are both communicated with the primary hydraulic compression host, the secondary air inlet pipeline and the secondary air outlet pipeline are both communicated with the secondary hydraulic compression host, the secondary air outlet pipeline is communicated with the air filling machine, and the primary air outlet pipeline and the secondary air inlet pipeline are communicated through an interstage connection pipeline; the oil inlet and return pipelines of the primary main hydraulic station assembly are communicated with the primary hydraulic compression main machine, the oil inlet and return pipelines of the secondary main hydraulic station assembly are communicated with the secondary hydraulic compression main machine, the oil inlet and return pipelines of the secondary hydraulic station are communicated with the primary hydraulic compression main machine, and the oil inlet and return pipelines of the secondary hydraulic station are communicated with the secondary hydraulic compression main machine.
Preferably, the primary hydraulic compression main engine comprises an oil cylinder barrel, a piston rod assembly, an intermediate assembly, a cylinder barrel and a cylinder head, wherein the oil cylinder barrel is of a hollow structure, the piston rod assembly is positioned in the oil cylinder barrel, the two intermediate assemblies are mounted at two ends of the oil cylinder barrel through bolts, the cylinder barrel is fixedly connected with the intermediate assembly through bolts, and the cylinder head is fixedly connected with the cylinder barrel through bolts.
Preferably, the piston rod assembly comprises an oil cylinder piston, a connecting shaft, an air cylinder piston, a connecting rod, a sealing washer and a locking nut, a plurality of countersunk holes are formed in the oil cylinder piston, the connecting rod and the two oil cylinder pistons are connected into a whole through limiting of the sealing washer and the locking nut, the centers of the oil cylinder piston and the air cylinder piston are provided with non-penetrating internal threaded holes, the two ends of the connecting shaft are provided with external threaded holes, and the specifications of the external threaded holes are consistent with those of the oil cylinder piston and the center of the air cylinder piston, which are provided with non-penetrating internal threaded holes.
Preferably, the oil cylinder barrel is provided with two auxiliary oil ports, the oil cylinder barrel is provided with an oil pressure sensor, the intermediate body assembly is provided with two main oil ports and a balance hole, the cylinder barrel is of a hollow structure, the cylinder barrel is provided with a balance port communicated with the balance hole, the cylinder barrel is provided with a displacement sensor, and the cylinder cover is provided with an air port.
Preferably, the first-stage air inlet pipeline is provided with a first one-way valve and a second one-way valve; a third one-way valve and a fourth one-way valve are arranged on the primary exhaust pipeline; a fifth one-way valve and a sixth one-way valve are arranged on the secondary air inlet pipeline; and a seventh one-way valve and an eighth one-way valve are arranged on the secondary exhaust pipeline.
Preferably, the primary main hydraulic station assembly comprises a primary main oil inlet pipeline and a primary main oil return pipeline, wherein the primary main oil inlet pipeline is provided with a first hydraulic pump, a first electromagnetic valve and a second electromagnetic valve, and the primary main oil return pipeline is provided with a third electromagnetic valve and a fourth electromagnetic valve.
Preferably, the secondary main hydraulic station assembly comprises a secondary main oil inlet pipeline and a secondary main oil return pipeline, wherein the secondary main oil inlet pipeline is provided with a second hydraulic pump, a ninth electromagnetic valve and a tenth electromagnetic valve, and the secondary main oil return pipeline is provided with an eleventh electromagnetic valve and a twelfth electromagnetic valve.
Preferably, the auxiliary hydraulic station comprises an auxiliary oil inlet pipeline and an auxiliary oil return pipeline, an auxiliary hydraulic pump, a fifth electromagnetic valve and a sixth electromagnetic valve are arranged on the auxiliary oil inlet pipeline, and a seventh electromagnetic valve and an eighth electromagnetic valve are arranged on the auxiliary oil return pipeline.
Preferably, the interstage connection pipeline is provided with an interstage pressure sensor, the interstage connection pipeline is also provided with a medium pressure gas taking pipeline communicated with the interstage connection pipeline, the other end of the medium pressure gas taking pipeline is communicated with the gas filling machine, and the medium pressure gas taking pipeline is provided with a thirteenth electromagnetic valve and a ninth one-way valve.
The invention also provides a using method of the hydraulic compressor device for the natural gas filling substation, which comprises a primary pressurizing method S1 and a secondary pressurizing method S2 of natural gas;
the first-stage supercharging method S1 comprises the following steps of;
s11, natural gas with lower air pressure in an initial tank wagon enters an A cavity and a G cavity of a primary hydraulic compression main machine through a first one-way valve and a second one-way valve of a primary air inlet pipeline, an auxiliary hydraulic pump and a first hydraulic pump are started, a fifth electromagnetic valve is opened, a seventh electromagnetic valve is closed, low-pressure hydraulic oil in an auxiliary hydraulic station enters a D cavity of the primary hydraulic compression main machine, the first electromagnetic valve and a fourth electromagnetic valve are opened, a second electromagnetic valve and a third electromagnetic valve are closed, high-pressure hydraulic oil in a primary hydraulic station assembly enters a C cavity of the primary hydraulic compression main machine, at the moment, an E cavity returns oil, a piston rod assembly is pushed to move from the C cavity to the E cavity, the volume of the A cavity is enlarged, the air pressure is reduced, air in the tank wagon enters the A cavity through the first one-way valve, at the moment, the volume of the G cavity is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the air in the G cavity flows into the rear end of a primary air exhaust pipeline through the fourth one-way valve;
s12, when a piston rod assembly moves from a cavity C to a cavity E and a cylinder piston close to a cavity G is sensed by a corresponding displacement sensor, a displacement sensor sends a feedback signal to a PLC control system, a first electromagnetic valve and a fourth electromagnetic valve are closed at the moment, a second electromagnetic valve and a third electromagnetic valve are opened, high-pressure hydraulic oil in a primary main hydraulic station assembly enters the cavity E of a primary hydraulic compression host, the cavity C returns oil at the moment, the piston rod assembly is pushed to move from the cavity E to the cavity C, the cavity G is enlarged in volume, the air pressure is reduced, air in a tank car enters the cavity G through a second one-way valve, the cavity A is reduced in volume, natural air in the cavity A is compressed, the air pressure is increased, and air in the cavity A flows into the rear end of a primary exhaust pipeline through a third one-way valve;
s13, when a piston rod assembly moves from an E cavity to an E cavity, and a cylinder piston close to an A cavity is sensed by a corresponding displacement sensor, a displacement sensor sends a feedback signal to a PLC control system, a first electromagnetic valve and a fourth electromagnetic valve are opened, a second electromagnetic valve and a third electromagnetic valve are closed, high-pressure hydraulic oil in a primary main hydraulic station assembly enters a C cavity of a primary hydraulic compression host, the E cavity returns oil at the moment, the piston rod assembly is pushed to move from the C cavity to the E cavity, the volume of the A cavity becomes larger, the air pressure is reduced, air in a tank car enters the A cavity through a first one-way valve, the volume of the G cavity becomes smaller, natural air in the G cavity is compressed, the air pressure is increased, and air in the G cavity flows into the rear end of a primary exhaust pipeline through a fourth one-way valve;
s14, repeating the cycle of S12 and S13;
the secondary supercharging method S2 comprises the following steps of;
s21, natural gas at the rear end of a primary exhaust pipeline subjected to primary pressurization through the S1 method enters a secondary hydraulic compression main machine, a second hydraulic pump is started, a sixth electromagnetic valve is opened, an eighth electromagnetic valve is closed, low-pressure hydraulic oil in a secondary hydraulic station enters a D cavity of the secondary hydraulic compression main machine, a ninth electromagnetic valve and a twelfth electromagnetic valve are opened, a tenth electromagnetic valve and an eleventh electromagnetic valve are closed, high-pressure hydraulic oil in a secondary main hydraulic station component enters a C cavity of the secondary hydraulic compression main machine, at the moment, an E cavity returns oil, a piston rod component of the secondary hydraulic compression main machine is pushed to move from the C cavity to the E cavity, the volume of the A cavity is enlarged, the air pressure is reduced, natural gas in the primary exhaust pipeline enters the A cavity of the secondary hydraulic compression main machine through a fifth one-way valve, at the moment, the volume of the G cavity is reduced, natural gas in the G cavity is compressed, the air pressure is increased, and gas in the G cavity flows into the rear end of the secondary exhaust pipeline through the eighth one-way valve and then flows into the air filling machine;
s22, when a piston rod assembly in the secondary hydraulic compression host moves from a C cavity to an E cavity, and a cylinder piston close to a G cavity is sensed by a corresponding displacement sensor, a feedback signal is sent to a PLC control system by the displacement sensor, a ninth electromagnetic valve and a twelfth electromagnetic valve are closed, a tenth electromagnetic valve and an eleventh electromagnetic valve are opened, high-pressure hydraulic oil in a secondary main hydraulic station assembly enters the E cavity of the secondary hydraulic compression host, the C cavity returns oil, the piston rod assembly of the secondary hydraulic compression host is pushed to move from the E cavity to the C cavity, the G cavity volume is enlarged, the air pressure is reduced, natural gas in a primary exhaust pipeline enters the G cavity of the secondary hydraulic compression host through a sixth one-way valve, the A cavity volume is reduced, the natural gas in the A cavity is compressed, the air pressure is increased, and the gas in the A cavity flows into the rear end of the secondary exhaust pipeline through a seventh one-way valve and then flows into the machine;
s23, when a piston rod assembly in the secondary hydraulic compression host moves from an E cavity to a C cavity, and a cylinder piston close to an A cavity is sensed by a corresponding displacement sensor, a feedback signal is sent to a PLC control system by the displacement sensor, a ninth electromagnetic valve and a twelfth electromagnetic valve are opened, a tenth electromagnetic valve and an eleventh electromagnetic valve are closed, high-pressure hydraulic oil in a secondary main hydraulic station assembly enters a C cavity of the secondary hydraulic compression host, the E cavity returns oil, the piston rod assembly of the secondary hydraulic compression host is pushed to move from the C cavity to the E cavity, the A cavity volume is enlarged, the air pressure is reduced, natural gas in a primary exhaust pipeline enters the A cavity of the secondary hydraulic compression host through a fifth one-way valve, the G cavity volume is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into the rear end of the secondary exhaust pipeline through an eighth one-way valve and then flows into the air filling machine;
and S24, repeating the loops of S22 and S23.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the hydraulic compressor device for the natural gas filling substation, provided by the invention, low-pressure gas in the tank car can be quickly pressurized and conveyed to the filling machine through the arrangement of the tank car, the primary air inlet pipeline, the primary hydraulic compression host, the primary main hydraulic station component, the secondary hydraulic compression host, the secondary hydraulic station, the primary air outlet pipeline, the secondary air inlet pipeline, the secondary main hydraulic station component, the secondary air outlet pipeline, the filling machine and the PLC control system, so that the requirement of a terminal of the filling substation is met.
(2) According to the hydraulic compressor device for the natural gas filling substation, the auxiliary oil inlet pipeline and the auxiliary oil return pipeline are arranged, so that low-pressure hydraulic oil in the D cavity of the main machine of the compressor is in a pressurized state, when a displacement sensor signals a PLC control system to open and close related electromagnetic valves to change the moving direction of a piston rod assembly, the low-pressure hydraulic oil in the D cavity plays a role in reversely buffering the whole main machine, meanwhile, the traditional electromagnetic reversing valve is replaced by the combination of opening and closing of the electromagnetic valves, and the oil way of the whole device runs more stably by utilizing the reverse buffering effect.
(3) According to the hydraulic compressor device for the natural gas filling substation, provided by the invention, due to the existence of the auxiliary hydraulic station, the oil pressure of the high-pressure main oil inlet of the main machine of the hydraulic compressor is lower than that of a structure without using the auxiliary hydraulic station, so that the requirements on sealing and the like of a main hydraulic station assembly are reduced.
(4) According to the hydraulic compressor device for the natural gas filling substation, provided by the invention, the functions of two-stage supercharging high-pressure gas taking and one-stage supercharging medium-pressure gas taking can be realized according to the actual condition of the pressure in the tank wagon, so that the utilization rate of equipment is improved, and the energy consumption is reduced.
(5) According to the hydraulic compressor device for the natural gas filling substation, the traditional main hydraulic station is replaced by the three hydraulic stations, the volume of each hydraulic station is small, the hydraulic stations can be placed in a space stacking structure, and the total occupied area is reduced.
(6) According to the hydraulic compressor device for the natural gas filling substation, the electromagnetic valve of the oil inlet and return pipeline of each hydraulic station is opened and closed independently, so that the mutual interference of the traditional main hydraulic station on oil supply of the two-stage compression main machine is avoided.
(7) According to the hydraulic compressor device for the natural gas filling substation, the plurality of connecting rods are arranged in the piston rod assembly, so that the rigidity of the piston rod assembly is improved, meanwhile, the requirement of the traditional coaxiality of the piston rod is avoided through the sectional design, and the processing difficulty is reduced.
(8) According to the hydraulic compressor device for the natural gas filling substation, provided by the invention, through the arrangement of the PLC control system, the electromagnetic valve, the displacement sensor, the pressure sensor and the hydraulic pump, the automation control degree is high, and meanwhile, through the arrangement of the one-way valve, the reliability of the whole system is high.
Drawings
FIG. 1 is a general schematic of embodiment 1 of the present invention;
FIG. 2 is a general schematic of the oil circuit of the present invention;
FIG. 3 is a schematic diagram of the primary hydraulic compression engine of the present invention;
FIG. 4 is a schematic structural view of the piston rod assembly of the present invention;
FIG. 5 is a partial cross-sectional view of I-I of FIG. 3 in accordance with the present invention;
fig. 6 is a general schematic of embodiment 2 of the present invention.
In the figure: 100. a primary air intake duct; 101. a first one-way valve; 102. a second one-way valve; 200. a primary hydraulic compression host; 201. an oil pressure sensor; 202. a displacement sensor; 210. an oil cylinder; 211. an auxiliary oil port; 220. a piston rod assembly; 221. an oil cylinder piston; 222. a connecting shaft; 223. a cylinder piston; 224. a connecting rod, 225, sealing washers; 226. a lock nut; 230. an intermediate assembly; 231. a main oil port; 232. a balance hole; 240. a cylinder barrel; 241. a balancing port; 250. a cylinder head; 251. an air port; 300. a primary main hydraulic station assembly; 310. a primary main oil inlet pipe; 311. a first hydraulic pump; 312. a first electromagnetic valve; 313. a second electromagnetic valve; 320. primary main oil return pipeline; 321. a third electromagnetic valve; 322. a fourth electromagnetic valve; 400. a secondary hydraulic compression host; 500. a secondary hydraulic station; 510. an auxiliary oil inlet pipeline; 511. an auxiliary hydraulic pump; 512. a fifth electromagnetic valve; 513. a sixth electromagnetic valve; 520. an auxiliary oil return pipeline; 521. a seventh electromagnetic valve; 522. an eighth electromagnetic valve; 600. a primary exhaust duct; 601. a third one-way valve; 602. a fourth one-way valve; 610. an inter-stage connecting pipe; 611. an inter-stage pressure sensor; 700. a secondary air intake duct; 701. a fifth check valve; 702. a sixth one-way valve; 800. a secondary main hydraulic station assembly; 810. a secondary main oil inlet pipeline; 811. a second hydraulic pump; 812. a ninth electromagnetic valve; 813. a tenth electromagnetic valve; 820. a secondary main oil return pipeline; 821. an eleventh electromagnetic valve; 822. a twelfth electromagnetic valve; 900. a secondary exhaust duct; 901. a seventh one-way valve; 902. an eighth check valve; 1000. a medium pressure gas taking pipeline; 1001. a thirteenth electromagnetic valve; 1002; and a ninth one-way valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like are merely used for convenience in describing the present invention and to simplify the description, and do not denote or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
It should be understood that in the description of the invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and defined.
Example 1
Referring to fig. 1 to 5, a hydraulic compressor device for a natural gas filling substation provided in this embodiment 1 includes a tank car, a primary air intake pipe 100, a primary hydraulic compression main unit 200, a primary main hydraulic station assembly 300, a secondary hydraulic compression main unit 400, a secondary hydraulic station 500, a primary air exhaust pipe 600, a secondary air intake pipe 700, a secondary main hydraulic station assembly 800, a secondary air exhaust pipe 900, a filling machine, and a PLC control system.
One end of the primary air inlet pipeline 100 is communicated with the tank wagon, the other end of the primary air inlet pipeline 100 is communicated with the primary hydraulic compression host 200, and the primary air inlet pipeline 100 is provided with a first check valve 101 and a second check valve 102.
The primary hydraulic compression host 200 comprises an oil cylinder 210, a piston rod assembly 220, an intermediate body assembly 230, a cylinder barrel 240 and a cylinder head 250, wherein the oil cylinder 210 is of a hollow structure, the piston rod assembly 220 is positioned in the oil cylinder 210, the two intermediate body assemblies 230 are mounted at two ends of the oil cylinder 210 through bolts, the cylinder barrel 240 is fixedly connected with the intermediate body assembly 230 through bolts, and the cylinder head 250 is fixedly connected with the cylinder barrel 240 through bolts.
The oil cylinder 210 is provided with two auxiliary oil ports 211, the oil cylinder is provided with an oil pressure sensor 201, the piston rod assembly 220 comprises an oil cylinder piston 221, a connecting shaft 222, an air cylinder piston 223, a connecting rod 224, a sealing gasket 225 and a locking nut 226, a plurality of countersunk holes are formed in the oil cylinder piston 221, the connecting rod 224 and the two oil cylinder pistons 221 are connected into a whole through the limiting of the sealing gasket 225 and the locking nut 226, the centers of the oil cylinder piston 221 and the air cylinder piston 223 are provided with non-penetrating internal threaded holes, the two ends of the connecting shaft 222 are provided with external threaded holes, and the specification of the external threaded holes is consistent with that of the non-penetrating internal threaded holes formed in the centers of the oil cylinder piston 221 and the air cylinder piston 223; two main oil ports 231 and a balance hole 232 are formed in the middle body assembly 230, the cylinder barrel 240 is of a hollow structure, a balance hole 241 communicated with the balance hole 232 is formed in the cylinder barrel 240, the displacement sensor 202 is arranged on the cylinder barrel 240, and the air port 251 is arranged on the cylinder cover 250.
Through the structural design of the primary hydraulic compression host 200, the primary hydraulic compression host 200 is divided into seven chambers such as A, B, C, D, E, F, G, wherein a chamber A and a chamber G are used for primary air intake or air exhaust, a chamber B and a chamber F are communicated with the atmosphere, a chamber C and a chamber E are used for primary oil intake or oil return, and a chamber D is used for storing low-pressure hydraulic oil.
The oil inlet and return pipelines of the primary main hydraulic station assembly 300 are all communicated with the primary hydraulic compression host 200, the primary main hydraulic station assembly 300 comprises a primary main oil inlet pipeline 310 and a primary main oil return pipeline 320, a first hydraulic pump 311, a first electromagnetic valve 312 and a second electromagnetic valve 313 are arranged on the primary main oil inlet pipeline 310, and a third electromagnetic valve 321 and a fourth electromagnetic valve 322 are arranged on the primary main oil return pipeline 320.
The secondary hydraulic compression engine 400 also serves to boost the pressure of the gas, and is similar in structure to the primary hydraulic compression engine 200, and the two are different in external dimensions, and will not be described in detail.
The auxiliary hydraulic station 500 has two circuits, wherein the oil inlet and return pipelines of one circuit are all communicated with the primary hydraulic compression main machine 200, the oil inlet and return pipelines of the other circuit are all communicated with the secondary hydraulic compression main machine 400, the auxiliary hydraulic station 500 comprises an auxiliary oil inlet pipeline 510 and an auxiliary oil return pipeline 520, the auxiliary oil inlet pipeline 510 is provided with an auxiliary hydraulic pump 511, a fifth electromagnetic valve 512 and a sixth electromagnetic valve 513, and the auxiliary oil return pipeline 520 is provided with a seventh electromagnetic valve 521 and an eighth electromagnetic valve 522.
The primary exhaust pipe 600 is communicated with the primary hydraulic compression host 200, and a third check valve 601 and a fourth check valve 602 are arranged on the primary exhaust pipe 600.
The secondary air inlet pipeline 700 is communicated with the secondary hydraulic compression host 400, and the primary air outlet pipeline 600 is communicated with the secondary air inlet pipeline 700 through an inter-stage connecting pipeline 610; the second-stage intake pipe 700 is provided with a fifth check valve 701 and a sixth check valve 702.
The oil inlet and return pipelines of the secondary main hydraulic station assembly 800 are all communicated with the secondary hydraulic compression main machine 400, the secondary main hydraulic station assembly 800 comprises a secondary main oil inlet pipeline 810 and a secondary main oil return pipeline 820, the secondary main oil inlet pipeline 810 is provided with a second hydraulic pump 811, a ninth electromagnetic valve 812 and a tenth electromagnetic valve 813, and the secondary main oil return pipeline 820 is provided with an eleventh electromagnetic valve 821 and a twelfth electromagnetic valve 822.
One end of the secondary exhaust pipeline 900 is communicated with the secondary hydraulic compression host 400, the other end of the secondary exhaust pipeline 900 is communicated with the gas dispenser, and a seventh check valve 901 and an eighth check valve 902 are arranged on the secondary exhaust pipeline 900.
The embodiment 1 of the invention also provides a using method of the hydraulic compressor device for the natural gas filling substation, and the using method comprises a primary pressurizing method S1 and a secondary pressurizing method S2 of natural gas;
the first-stage supercharging method S1 comprises the following steps of;
s11, natural gas with lower air pressure in the initial tank wagon enters an A cavity and a G cavity of the primary hydraulic compression main machine 200 through a first check valve 101 and a second check valve 102 of the primary air inlet pipeline 100, a secondary hydraulic pump 511 and a first hydraulic pump 311 are started, a fifth electromagnetic valve 512 is opened, a seventh electromagnetic valve 521 is closed, low-pressure hydraulic oil in the secondary hydraulic station 500 enters a D cavity of the primary hydraulic compression main machine 200, a first electromagnetic valve 312 and a fourth electromagnetic valve 322 are opened, a second electromagnetic valve 313 and a third electromagnetic valve 321 are closed, high-pressure hydraulic oil in the primary hydraulic station assembly 300 enters a C cavity of the primary hydraulic compression main machine 200, at the moment, an E cavity returns oil, a piston rod assembly 220 is pushed to move from the C cavity to the E cavity, the volume of the A cavity is enlarged, the air pressure is reduced, gas in the tank wagon enters the A cavity through the first check valve 101, at the moment, the volume of the G cavity is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into the rear end of the primary air exhaust pipeline 600 through a fourth check valve 602;
s12, when the piston rod assembly 220 moves from the C cavity to the E cavity and is sensed by the corresponding displacement sensor 202, the displacement sensor 202 sends a feedback signal to the PLC control system, at the moment, the first electromagnetic valve 312 and the fourth electromagnetic valve 322 are closed, the second electromagnetic valve 313 and the third electromagnetic valve 321 are opened, high-pressure hydraulic oil in the primary main hydraulic station assembly 300 enters the E cavity of the primary hydraulic compression host 200, at the moment, the C cavity returns oil, the piston rod assembly 220 is pushed to move from the E cavity to the C cavity, the G cavity volume is enlarged, the air pressure is reduced, the air in the tank car enters the G cavity through the second one-way valve 102, at the moment, the A cavity volume is reduced, the natural gas in the A cavity is compressed, the air pressure is increased, and the air in the A cavity flows into the rear end of the primary exhaust pipeline 600 through the third one-way valve 601;
s13, when the piston rod assembly 220 moves from the E cavity to the E cavity, and the cylinder piston 223 close to the A cavity is sensed by the corresponding displacement sensor 202, a feedback signal is sent to the PLC control system by the displacement sensor 202, at the moment, the first electromagnetic valve 312 and the fourth electromagnetic valve 322 are opened, the second electromagnetic valve 313 and the third electromagnetic valve 321 are closed, high-pressure hydraulic oil in the primary main hydraulic station assembly 300 enters the C cavity of the primary hydraulic compression host 200, at the moment, the E cavity returns oil, the piston rod assembly 220 is pushed to move from the C cavity to the E cavity, the A cavity volume is enlarged, the air pressure is reduced, the air in the tank car enters the A cavity through the first one-way valve 101, at the moment, the G cavity volume is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the air in the G cavity flows into the rear end of the primary exhaust pipeline 600 through the fourth one-way valve 602;
s14, repeating the cycle of S12 and S13;
the secondary supercharging method S2 comprises the following steps of;
s21, natural gas at the rear end of the primary exhaust pipeline 600 subjected to primary pressurization through the S1 method enters the secondary hydraulic compression main machine 400, a second hydraulic pump 811 is started, a sixth electromagnetic valve 513 is opened, an eighth electromagnetic valve 522 is closed, low-pressure hydraulic oil in the secondary hydraulic station 500 enters a D cavity of the secondary hydraulic compression main machine 400, a ninth electromagnetic valve 812 and a twelfth electromagnetic valve 822 are opened, a tenth electromagnetic valve 813 and an eleventh electromagnetic valve 821 are closed, high-pressure hydraulic oil in the secondary main hydraulic station assembly 800 enters a C cavity of the secondary hydraulic compression main machine 400, at the moment, oil returns from the E cavity, a piston rod assembly of the secondary hydraulic compression main machine 400 is pushed to move from the C cavity towards the E cavity, the volume of the A cavity is increased, the air pressure is reduced, natural gas in the primary exhaust pipeline 600 enters the A cavity of the secondary hydraulic compression main machine 400 through a fifth one-way valve 701, at the moment, the volume of the G cavity is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into the rear end of the secondary exhaust pipeline 900 through the eighth one-way valve 902 and then flows into the machine;
s22, when a piston rod assembly in the secondary hydraulic compression host 400 moves from a C cavity to an E cavity, and a cylinder piston close to a G cavity is sensed by a corresponding displacement sensor, a displacement sensor sends feedback signals to a PLC control system, at the moment, a ninth electromagnetic valve 812 and a twelfth electromagnetic valve 822 are closed, a tenth electromagnetic valve 813 and an eleventh electromagnetic valve 821 are opened, high-pressure hydraulic oil in the secondary main hydraulic station assembly 800 enters the E cavity of the secondary hydraulic compression host 400, at the moment, the C cavity returns oil, the piston rod assembly of the secondary hydraulic compression host 400 is pushed to move from the E cavity to the C cavity, the volume of the G cavity is enlarged, the air pressure is reduced, natural gas in the primary exhaust pipeline 600 enters the G cavity of the secondary hydraulic compression host 400 through a sixth one-way valve 702, at the moment, the volume of the A cavity is reduced, the natural gas in the A cavity is compressed, the air pressure is increased, and the gas in the A cavity flows into the rear end of the secondary exhaust pipeline 900 through a seventh one-way valve 901 and then flows into the air-filling machine;
s23, when a piston rod assembly in the secondary hydraulic compression host 400 moves from the E cavity to the C cavity, and a cylinder piston close to the A cavity is sensed by a corresponding displacement sensor, a displacement sensor sends feedback signals to a PLC control system, at the moment, a ninth electromagnetic valve 812 and a twelfth electromagnetic valve 822 are opened, a tenth electromagnetic valve 813 and an eleventh electromagnetic valve 821 are closed, high-pressure hydraulic oil in the secondary main hydraulic station assembly 800 enters the C cavity of the secondary hydraulic compression host 400, at the moment, the E cavity returns oil, the piston rod assembly of the secondary hydraulic compression host 400 is pushed to move from the C cavity to the E cavity, the A cavity volume is enlarged, the air pressure is reduced, natural gas in the primary exhaust pipeline 600 enters the A cavity of the secondary hydraulic compression host 400 through a fifth one-way valve 701, at the moment, the G cavity volume is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into the rear end of the secondary exhaust pipeline 900 through an eighth one-way valve 902 and then flows into the air-filling machine;
and S24, repeating the loops of S22 and S23.
In embodiment 1, the oil paths of the primary compression and the secondary compression are independent, and since the pressure of the secondary oil inlet pipe 510 of the secondary hydraulic station 500 is substantially constant, two relief valves (not shown) are typically disposed on the secondary oil inlet pipe 510 to ensure the stability of the pressure of the D-chamber of the primary hydraulic compression main unit 200 and the D-chamber of the secondary hydraulic compression main unit 400.
Example 2
Referring to fig. 6, in a hydraulic compressor device for a natural gas filling substation according to embodiment 2, on the basis of embodiment 1, an inter-stage pressure sensor 611 is disposed on an inter-stage connection pipe 610, a medium pressure gas taking pipe 1000 which is communicated with the inter-stage connection pipe 610 is further disposed on the inter-stage connection pipe 610, the other end of the medium pressure gas taking pipe 1000 is communicated with a gas filling machine, a thirteenth electromagnetic valve 1001 and a ninth one-way valve 1002 are disposed on the medium pressure gas taking pipe 1000, in this embodiment 2, the secondary hydraulic compression main machine 400 and the secondary main hydraulic station assembly 800 do not work, the sixth electromagnetic valve 513 is closed, the eighth electromagnetic valve 522 is opened, the thirteenth electromagnetic valve 1001 is opened, and pressurized natural gas is supplied to the gas filling machine through the medium pressure gas taking pipe 1000.
Therefore, the hydraulic compressor device for the natural gas filling substation is mainly suitable for being used as a natural gas source of a tank car, when the pressure of the gas in the tank car is not less than 22MPa, the gas in the tank car can be directly connected to a gas filling machine (not shown in the figure), and the tank car is used for directly supplying gas, so that the compression device is not needed to be used for pressurizing the natural gas, namely the device does not work; when the pressure of the gas in the tank wagon is between 15 and 22MPa, working according to the embodiment 2 of the invention, the pressure requirement of the gas dispenser on the natural gas can be met through primary pressurization; when the pressure of the gas in the tank wagon is between 3 and 15MPa, the tank wagon works according to the embodiment 1 of the invention, and the pressure requirement of the gas dispenser on the natural gas can be met through two-stage pressurization; when the gas pressure in the tank car is lower than 3MPa, the tank car needs to be replaced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a hydraulic compressor device for natural gas filling substation, includes tank wagon and mechanism of qi, its characterized in that: the system also comprises a primary air inlet pipeline (100), a primary hydraulic compression main machine (200), a primary main hydraulic station assembly (300), a secondary hydraulic compression main machine (400), a secondary hydraulic station (500), a primary air exhaust pipeline (600), a secondary air inlet pipeline (700), a secondary main hydraulic station assembly (800), a secondary air exhaust pipeline (900) and a PLC control system;
the primary air inlet pipeline (100) is communicated with the tank car, the primary air inlet pipeline (100) and the primary air outlet pipeline (600) are both communicated with the primary hydraulic compression main machine (200), the secondary air inlet pipeline (700) and the secondary air outlet pipeline (900) are both communicated with the secondary hydraulic compression main machine (400), the secondary air outlet pipeline (900) is communicated with the air filling machine, and the primary air outlet pipeline (600) is communicated with the secondary air inlet pipeline (700) through an inter-stage connecting pipeline (610);
the oil inlet and return pipelines of the primary main hydraulic station assembly (300) are all communicated with the primary hydraulic compression main machine (200), the oil inlet and return pipelines of the secondary main hydraulic station assembly (800) are all communicated with the secondary hydraulic compression main machine (400), the oil inlet and return pipelines of the secondary hydraulic station (500) are all communicated with the primary hydraulic compression main machine (200), and the oil inlet and return pipelines of the secondary hydraulic station (500) are all communicated with the secondary hydraulic compression main machine (400);
a first one-way valve (101) and a second one-way valve (102) are arranged on the primary air inlet pipeline (100); a third check valve (601) and a fourth check valve (602) are arranged on the primary exhaust pipeline (600); a fifth one-way valve (701) and a sixth one-way valve (702) are arranged on the secondary air inlet pipeline (700); a seventh one-way valve (901) and an eighth one-way valve (902) are arranged on the secondary exhaust pipeline (900);
the primary main hydraulic station assembly (300) comprises a primary main oil inlet pipeline (310) and a primary main oil return pipeline (320), wherein a first hydraulic pump (311), a first electromagnetic valve (312) and a second electromagnetic valve (313) are arranged on the primary main oil inlet pipeline (310), and a third electromagnetic valve (321) and a fourth electromagnetic valve (322) are arranged on the primary main oil return pipeline (320);
the secondary main hydraulic station assembly (800) comprises a secondary main oil inlet pipeline (810) and a secondary main oil return pipeline (820), wherein a second hydraulic pump (811), a ninth electromagnetic valve (812) and a tenth electromagnetic valve (813) are arranged on the secondary main oil inlet pipeline (810), and an eleventh electromagnetic valve (821) and a twelfth electromagnetic valve (822) are arranged on the secondary main oil return pipeline (820);
the auxiliary hydraulic station (500) comprises an auxiliary oil inlet pipeline (510) and an auxiliary oil return pipeline (520), wherein an auxiliary hydraulic pump (511), a fifth electromagnetic valve (512) and a sixth electromagnetic valve (513) are arranged on the auxiliary oil inlet pipeline (510), and a seventh electromagnetic valve (521) and an eighth electromagnetic valve (522) are arranged on the auxiliary oil return pipeline (520);
an inter-stage pressure sensor (611) is arranged on the inter-stage connecting pipeline (610), the inter-stage connecting pipeline (610) is further provided with a medium-pressure gas taking pipeline (1000) communicated with the inter-stage connecting pipeline, the other end of the medium-pressure gas taking pipeline (1000) is communicated with the gas filling machine, and the medium-pressure gas taking pipeline (1000) is provided with a thirteenth electromagnetic valve (1001) and a ninth one-way valve (1002).
2. A hydraulic compressor arrangement for a natural gas filling substation according to claim 1, characterized in that: the primary hydraulic compression main machine (200) comprises an oil cylinder barrel (210), a piston rod assembly (220), an intermediate body assembly (230), a cylinder barrel (240) and a cylinder head (250), wherein the oil cylinder barrel (210) is of a hollow structure, the piston rod assembly (220) is located inside the oil cylinder barrel (210), the two intermediate body assemblies (230) are installed at two ends of the oil cylinder barrel (210) through bolts, the cylinder barrel (240) is fixedly connected with the intermediate body assembly (230) through bolts, and the cylinder head (250) is fixedly connected with the cylinder barrel (240) through bolts.
3. A hydraulic compressor arrangement for a natural gas filling substation according to claim 2, characterized in that: the piston rod assembly (220) comprises an oil cylinder piston (221), a connecting shaft (222), an air cylinder piston (223), connecting rods (224), sealing washers (225) and locking nuts (226), a plurality of countersunk holes are formed in the oil cylinder piston (221), the connecting rods (224) and the two oil cylinder pistons (221) are connected into a whole through limiting of the sealing washers (225) and the locking nuts (226), the centers of the oil cylinder piston (221) and the air cylinder piston (223) are provided with non-penetrating internal threaded holes, the two ends of the connecting shaft (222) are provided with external threaded holes, and the specifications of the external threaded holes are consistent with those of the oil cylinder piston (221) and the non-penetrating internal threaded holes in the center of the air cylinder piston (223).
4. A hydraulic compressor arrangement for a natural gas filling substation according to claim 2, characterized in that: the cylinder body is characterized in that two auxiliary oil ports (211) are formed in the oil cylinder barrel (210), an oil pressure sensor (201) is arranged on the oil cylinder barrel, two main oil ports (231) and a balance hole (232) are formed in the intermediate body assembly (230), the cylinder barrel (240) is of a hollow structure, a balance port (241) communicated with the balance hole (232) is formed in the cylinder barrel (240), a displacement sensor (202) is arranged on the cylinder barrel (240), and an air port (251) is formed in the cylinder cover (250).
5. A method of using the hydraulic compressor assembly for a natural gas filling substation according to any one of claims 1 to 4, wherein: the using method comprises a primary pressurizing method S1 and a secondary pressurizing method S2 of natural gas;
the first-stage supercharging method S1 comprises the following steps of;
s11, natural gas with lower air pressure in an initial tank wagon enters an A cavity and a G cavity of a primary hydraulic compression host machine (200) through a first one-way valve (101) and a second one-way valve (102) of a primary air inlet pipeline (100), an auxiliary hydraulic pump (511) and a first hydraulic pump (311) are started, a fifth electromagnetic valve (512) is opened, a seventh electromagnetic valve (521) is closed, low-pressure hydraulic oil in the auxiliary hydraulic station (500) enters a D cavity of the primary hydraulic compression host machine (200), a first electromagnetic valve (312) and a fourth electromagnetic valve (322) are opened, a second electromagnetic valve (313) and a third electromagnetic valve (321) are closed, high-pressure hydraulic oil in a primary hydraulic station assembly (300) enters a C cavity of the primary hydraulic compression host machine (200), oil is returned from the E cavity at the moment, a piston rod assembly (220) is pushed to move towards the E cavity, the A cavity volume is enlarged, air in the G cavity volume is reduced through the first one-way valve (101), natural gas in the G cavity is compressed, and air in the G cavity is increased, and air in the G cavity flows into the C cavity through the first one-way valve (602) after passing through the primary air outlet pipeline (602);
s12, when the piston rod assembly (220) moves from the cavity C to the cavity E and is sensed by the corresponding displacement sensor (202), the displacement sensor (202) sends feedback signals to the PLC control system, at the moment, the first electromagnetic valve (312) and the fourth electromagnetic valve (322) are closed, the second electromagnetic valve (313) and the third electromagnetic valve (321) are opened, high-pressure hydraulic oil in the primary main hydraulic station assembly (300) enters the cavity E of the primary hydraulic compression host (200), at the moment, the cavity C returns oil, the piston rod assembly (220) is pushed to move from the cavity E to the cavity C, the cavity G is enlarged in volume, the air pressure is reduced, air in the tank car is introduced into the cavity G through the second one-way valve (102), at the moment, the cavity A is reduced in volume, natural gas in the cavity A is compressed, the air pressure is increased, and the air in the cavity A flows into the rear end of the primary exhaust pipeline (600) through the third one-way valve (601);
s13, when a piston rod assembly (220) moves from an E cavity to an air cylinder piston (223) close to an A cavity in the E cavity direction, and is sensed by a corresponding displacement sensor (202), a feedback signal is sent to a PLC control system by the displacement sensor (202), at the moment, a first electromagnetic valve (312) and a fourth electromagnetic valve (322) are opened, a second electromagnetic valve (313) and a third electromagnetic valve (321) are closed, high-pressure hydraulic oil in a primary main hydraulic station assembly (300) enters a C cavity of a primary hydraulic compression host (200), at the moment, the E cavity returns oil, the piston rod assembly (220) is pushed to move from the C cavity to the E cavity direction, the A cavity volume is enlarged, the air pressure is reduced, air in a tank car enters the A cavity through a first one-way valve (101), at the moment, the G cavity volume is reduced, natural gas in the G cavity is compressed, the air pressure is increased, and the air in the G cavity flows into the rear end of a primary exhaust pipeline (600) through a fourth one-way valve (602);
s14, repeating the cycle of S12 and S13;
the secondary supercharging method S2 comprises the following steps of;
s21, natural gas at the rear end of a primary exhaust pipeline (600) subjected to primary pressurization through the S1 method enters a secondary hydraulic compression main machine (400), a second hydraulic pump (811) is started, a sixth electromagnetic valve (513) is opened, an eighth electromagnetic valve (522) is closed, low-pressure hydraulic oil in a secondary hydraulic station (500) enters a D cavity of the secondary hydraulic compression main machine (400), a ninth electromagnetic valve (812) and a twelfth electromagnetic valve (822) are opened, a tenth electromagnetic valve (813) and an eleventh electromagnetic valve (821) are closed, high-pressure hydraulic oil in a secondary main hydraulic station assembly (800) enters a C cavity of the secondary hydraulic compression main machine (400), at the moment, oil returns from an E cavity, a piston rod assembly pushing the secondary hydraulic compression main machine (400) moves from the C cavity to the E cavity, the volume of the A cavity becomes the atmosphere, the air pressure is reduced, natural gas in the primary exhaust pipeline (600) enters an A cavity of the secondary hydraulic compression main machine (400) through a fifth one-way valve (701), the volume of the G cavity becomes smaller, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into a C cavity through the eighth one-way valve (902) and then flows into the air-filling end of the secondary hydraulic compression main machine (902);
s22, when a piston rod assembly in the secondary hydraulic compression host (400) moves from a C cavity to an E cavity, and a cylinder piston close to a G cavity is sensed by a corresponding displacement sensor, a displacement sensor sends a feedback signal to a PLC control system, at the moment, a ninth electromagnetic valve (812) and a twelfth electromagnetic valve (822) are closed, a tenth electromagnetic valve (813) and an eleventh electromagnetic valve (821) are opened, high-pressure hydraulic oil in a secondary main hydraulic station assembly (800) enters the E cavity of the secondary hydraulic compression host (400), at the moment, the C cavity returns oil, the piston rod assembly of the secondary hydraulic compression host (400) is pushed to move from the E cavity to the C cavity, the volume of the G cavity is enlarged, the air pressure is reduced, natural gas in a primary exhaust pipeline (600) is fed into the G cavity of the secondary hydraulic compression host (400) through a sixth one-way valve (702), at the moment, the volume of the A cavity is reduced, the natural gas in the A cavity is compressed, the air pressure is increased, and the gas in the A cavity flows into the rear end of the secondary exhaust pipeline (900) through a seventh one-way valve (901);
s23, when a piston rod assembly in the secondary hydraulic compression host (400) moves from an E cavity to a C cavity, and a cylinder piston close to an A cavity is sensed by a corresponding displacement sensor, a displacement sensor sends a feedback signal to a PLC control system, at the moment, a ninth electromagnetic valve (812) and a twelfth electromagnetic valve (822) are opened, a tenth electromagnetic valve (813) and an eleventh electromagnetic valve (821) are closed, high-pressure hydraulic oil in a secondary main hydraulic station assembly (800) enters the C cavity of the secondary hydraulic compression host (400), at the moment, the E cavity returns oil, the piston rod assembly of the secondary hydraulic compression host (400) is pushed to move from the C cavity to the E cavity, the volume of the A cavity is enlarged, the air pressure is reduced, natural gas in a primary exhaust pipeline (600) is fed into the A cavity of the secondary hydraulic compression host (400) through a fifth one-way valve (701), at the moment, the volume of the G cavity is reduced, the natural gas in the G cavity is compressed, the air pressure is increased, and the gas in the G cavity flows into the rear end of the secondary exhaust pipeline (900) through an eighth one-way valve (902);
and S24, repeating the loops of S22 and S23.
CN202311033234.1A 2023-08-16 2023-08-16 Hydraulic compressor device for natural gas filling substation and use method Active CN117006406B (en)

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CN113446518A (en) * 2021-06-21 2021-09-28 无锡气净法工业技术有限公司 High-pressure compression device for hydrogen filling station

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CN201593488U (en) * 2009-12-30 2010-09-29 四川金星压缩机制造有限公司 Hydraulic piston type gas compressor for natural gas secondary filling stations
CN102322413A (en) * 2011-08-30 2012-01-18 重庆耐德燃气设备有限公司 Hydraulic oil piston type natural gas sub-station compressor
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CN206669315U (en) * 2017-01-10 2017-11-24 佛山市汽车燃气有限公司 A kind of band helping air supply function CNG routines gas station
CN113446518A (en) * 2021-06-21 2021-09-28 无锡气净法工业技术有限公司 High-pressure compression device for hydrogen filling station

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