CN205298096U - Natural gas filling station's closed loop hydraulic compressor arrangement - Google Patents

Abstract

The utility model provides a natural gas filling station's closed loop hydraulic compressor arrangement, includes the twoth hydraulic pressurized container, and two hydraulic pressurized container inner chambers all are equipped with level sensor, and air supply line and pressure boost gas transmission pipeline are all connected through an air current automatic switching control equipment to two hydraulic pressurized container's natural gas pipe way interface, and the pressure boost gas -supply pipe is equipped with the third heat exchanger that is used for cooling off the natural gas on the road, two hydraulic pressurized container's hydraulic pressure oil pipe way interface feeds through with the working hole of hydraulic pressure switching -over device through first, the second heat exchanger that is used for cooling off hydraulic pressure oil, and the pressure mouth of hydraulic pressure switching -over device feeds through the high -pressure oil pump export, and the oil return opening intercommunication high -pressure oil pump import, forms voltol oil closed circuit loop line structure, the automatic replenishment system of a hydraulic oil passes through the check valve and is connected with voltol oil closed circuit loop line, the coolant of first, second, third heat exchanger advances, exit linkage coolant circulation pipeline, level sensor, high -pressure oil pump, hydraulic pressure switching -over device are connected with the controller electricity.

Description

The closed loop hydraulic compression device of natural gas filling station

Technical field

This utility model relates to natural gas compression equipment, particularly to the closed loop hydraulic compression device of a kind of natural gas filling station.

Background technology

At present, natural gas is compressed by the hydraulic compressed machine of employing that the compressibility of natural gas supply sub-station is more, and the pipeline of the pressure charging system of this hydraulic compressed machine is usually employing open type, namely extracted from the fuel tank of normal pressure by high-pressure oil pump as the hydraulic oil of supercharging, after compressor is pressurizeed, circulation flow back in the fuel tank of normal pressure again, therefore the pressurized operation to each circulation of high-pressure oil pump, pressure all need to be pressurized to commonly required 20MPa from 0MPa, cause pressure stroke long, the shortcoming that power consumption is big.

Meanwhile, the natural gas compressor overall compression ratio of usual natural gas supply sub-station is up to more than 8, therefore compressor many employings implements spatial scalable compression structure. Owing to gas compression is an exothermic process, substantial amounts of heat can be produced, gas temperature is made to raise, and the more big temperature rise of compression ratio is more high, the life-span of some sealing members not only can be impacted by this temperature rise, air inflow can be reduced and make capacity reduce simultaneously, thus, every one stage of compression all must be provided with the chiller heat of compression to this grade and cools, the temperature making compression gas drops to 40��45 DEG C, entering back into next stage compression, thus cause that arranging of cooling system is huge, complicated, repair and maintenance is extremely inconvenient. It is air-cooled to implement that current chiller is generally adopted high-power Air cooler, and power consumption is relatively big, and noise is also big. Such as now adopt more hydraulic piston type natural gas compressor, it directly drives piston compression gas with hydraulic oil, the amount of heat of gas discharging in compression process, a portion heat is transmitted in air by compressing casing wall, Air cooler need to be set compressor casing is carried out radiating and cooling, another part heat is conducted to hydraulic oil by metallic piston, take away during by hydraulic oil flow oil sump tank, but the high-temperature gas that main heat still needs in cylinder out is taken out of, therefore also need to arrange step cooler on the pipeline that gas flows through and cool down.

Further, the hydraulic system of existing natural pressure compression apparatus produces low on fuel phenomenon in the course of the work because of leakage, all can not realize online timely automated supplementary, it is necessary to shutdown carries out hydraulic oil and supplements, and causes gas station operating interruptions, affects normal operation.

Summary of the invention

The purpose of this utility model is the deficiency existed for prior art, it is provided that the closed loop hydraulic compression device of a kind of natural gas filling station. It makes two hydraulic booster containers, First Heat Exchanger, the second heat exchanger, hydraulic commutator, high-pressure oil pump form hydraulic oil closed loop pipeline structure, the gas pipeline interface of two hydraulic booster containers is connected each through an air-flow automatic switching control equipment supply air line and supercharging air delivering pipeline, supercharging air delivering pipeline arranges the 3rd heat exchanger, and arranges one and be connected with hydraulic oil closed loop pipeline for the hydraulic oil JUMPS Automated Supplemental System that the leakage of hydraulic oil closed loop pipeline oil is supplemented. Adopt one stage of compression mode, two hydraulic booster containers hocket and compress the work of gas continuously, it is possible to produced gas compression heat realizes directly cooling up to more than 8 to compression ratio, improves the cooling efficiency of compressed natural gas and hydraulic oil; And the oil leakage of closed loop pipeline can also be automatically replenished canbe used on line, solve prior art and need to shut down a difficult problem for repairing, make work efficiency be greatly improved.

The purpose of this utility model is achieved in that the closed loop hydraulic compression device of a kind of natural gas filling station, including the first hydraulic booster container, second hydraulic booster container, two hydraulic booster container upright are arranged, the upper end of each hydraulic booster container is provided with gas pipeline interface, lower end is provided with hydraulic oil pipeline interface, two hydraulic booster container intracavity tops are equipped with the liquid level sensor for commutation control, described first hydraulic booster container, the gas pipeline interface of the second hydraulic booster container connects supply air line and supercharging air delivering pipeline each through an air-flow automatic switching control equipment, described supercharging air delivering pipeline is provided with the 3rd heat exchanger for cooled natural gas, the hydraulic oil pipeline interface of described first hydraulic booster container is by connecting for the First Heat Exchanger of coolant force feed and the first working hole of a hydraulic commutator, the hydraulic oil pipeline interface of described second hydraulic booster container is by connecting with the second working hole of this hydraulic commutator for the second heat exchanger of coolant force feed, the pressure port of this hydraulic commutator and the outlet of high-pressure oil pump, the oil return opening of this hydraulic commutator and the inlet communication of high-pressure oil pump, form hydraulic oil closed loop pipeline structure, one is connected with hydraulic oil closed loop pipeline by check valve for the hydraulic oil JUMPS Automated Supplemental System that the leakage of hydraulic oil closed loop pipeline oil is supplemented, the cooling medium import and export of described first, second, third heat exchanger connects cooling medium circulation line, described liquid level sensor, high-pressure oil pump, hydraulic commutator are electrically connected with the controller.

Described first, second, third heat exchanger all includes tubular shell, two end cap, some heat-exchange tubes, described cylindrical case body wall is provided with mean for the inlet and outlet that cooling medium passes through, described tubular shell and two end cap are fixedly connected to form cooling medium and pass through chamber, described two end cap is equipped with pipeline connecting hole, some heat-exchange tubes are arranged on cooling medium and pass through intracavity, spacing is left between each heat-exchange tube, the two ends of described heat-exchange tube connect with the pipeline connecting hole arranged in two end cap respectively, and the fluid for supply and demand cooling passes through.

The two ends of described heat-exchange tube are connected fixing respectively through connecting seat with end cap, each end cap is equipped with groove and communicates with pipeline connecting hole.

The first oil vessel it is provided with between described First Heat Exchanger and hydraulic commutator, the upper port of the first oil vessel connects with First Heat Exchanger, the lower port of the first oil vessel connects with the first working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the first repairing; It is provided with the second oil vessel between described second heat exchanger and hydraulic commutator, the upper port of the second oil vessel connects with the second heat exchanger, the lower port of the second oil vessel connects with the second working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the second repairing.

Described hydraulic oil JUMPS Automated Supplemental System includes slippage pump, oil feeding reservoir, liquid level detector, benefit oil control valve group, the entrance point of described slippage pump connects oil feeding reservoir, the port of export pipeline of slippage pump is provided with Pressure gauge and mends oil control valve group, the port of export pipeline of slippage pump and being connected with hydraulic oil closed loop pipeline by check valve, described liquid level detector is located in oil feeding reservoir, and described liquid level detector, slippage pump are electrically connected with the controller.

Two hydraulic booster containers all include shell and upper and lower cover body, described upper and lower cover body is connected fixing with shell by threaded engagement, set sealing ring between upper and lower cover body and shell to seal, described upper cover body arranges gas pipeline interface, this gas pipeline interface installs the liquid level sensor for commutation control, and described lower cover arranges hydraulic oil pipeline interface.

Described high-pressure oil pump adopts the high-pressure oil pump group composed in parallel by least two high-pressure oil pump, and the inlet parallel of each high-pressure oil pump is in the oil return pipe being connected with the oil return opening of hydraulic commutator, and each hydraulic oil delivery side of pump is parallel to the pressure port of hydraulic commutator.

Described high-pressure oil pump adopts plunger-type high pressure oil pump.

Being provided with acoustic filter between the outlet of described high-pressure oil pump and the pressure port of hydraulic commutator, hydraulic oil delivery side of pump is connected with the upstream extremity of acoustic filter through check valve, and the downstream of acoustic filter is connected with the pressure port of hydraulic commutator; Pipeline between downstream and the pressure port of hydraulic commutator of described acoustic filter is provided with pressure unloading sensor, and the oil return pipe being connected with the import of high-pressure oil pump by an off-load branch road is connected, and this off-load branch road is provided with overflow valve.

Described supply air line arranges a straight-through bypass, this straight-through bypass stepped air-flow automatic switching control equipment, crossing with supercharging air delivering pipeline and be connected the upstream extremity of compressed natural gas gas transmission main, the downstream of described compressed natural gas gas transmission main arranges multiple interface for being connected with air entraining substation air delivering pipeline, described supercharging air delivering pipeline arranges an Oil-gas Separation pressurizing vessel, the air inlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects the outlet pipe connecting hole of the 3rd heat exchanger by the supercharging air delivering pipeline of upstream, the gas outlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects compressed natural gas gas transmission main by the supercharging air delivering pipeline in downstream, the lower end of described Oil-gas Separation pressurizing vessel arranges leakage fluid dram, this leakage fluid dram connects oil feeding reservoir by stop valve, one liquid level sensor is arranged on pressurizing vessel inner chamber bottom, this liquid level sensor is electrically connected with the controller, and with two hydraulic booster container intracavity tops arrange for commutation control liquid level sensor formed insurance sender system.

Adopt such scheme, two hydraulic booster container intracavity tops are equipped with the liquid level sensor for commutation control, described first hydraulic booster container, the second hydraulic booster container gas pipeline interface connect supply air line and supercharging air delivering pipeline each through an air-flow automatic switching control equipment, described supercharging air delivering pipeline is provided with the 3rd heat exchanger for cooled natural gas, the hydraulic oil pipeline interface of described first hydraulic booster container is by connecting for the First Heat Exchanger of coolant force feed and the first working hole of a hydraulic commutator, the hydraulic oil pipeline interface of described second hydraulic booster container is by connecting with the second working hole of this hydraulic commutator for the second heat exchanger of coolant force feed, the pressure port of this hydraulic commutator and the outlet of high-pressure oil pump, the oil return opening of this hydraulic commutator and the inlet communication of high-pressure oil pump, form hydraulic oil closed loop pipeline structure. thus, the high-pressure oil pump being overcome existing natural gas compression equipment by hydraulic oil closed loop pipeline structure is pressurizeed every time, need to from the fuel tank of atmosphere extract hydraulic oil, pressure is pressurized to commonly required 20MPa from 0MPa, cause pressure stroke long, the shortcoming that energy consumption is big, hydraulic oil closed loop pipeline structure is enable to make full use of hydraulic commutator by the driving kinetic energy of high-pressure oil pump alternating action between two hydraulic booster containers, make hydraulic oil alternately two hydraulic booster containers of reciprocal entrance, respectively the natural gas being alternately entered hydraulic booster container by air-flow automatic switching control equipment is compressed, supercharging is discharged.Compression process to natural gas can make full use of bleed pressure and (i.e. the overbottom pressure of natural gas in natural gas transportation tank car) air inlet kinetic energy and off-load kinetic energy can be converted to, be combined with the hydraulic-driven kinetic energy of hydraulic oil closed loop pipeline structure, making high-pressure oil pump pressurize need not from 0MPa, but pressurization from the overbottom pressure of natural gas, shorten boosting stroke, a large amount of kinetic energy can be saved, reduce energy consumption. And in hydraulic oil closed loop pipeline structure; natural gas is directly extruded because of hydraulic oil; it is dissolved in the natural gas in hydraulic oil to overflow from hydraulic oil closed loop pipeline; stop the phenomenon often having free natural gas to overflow in prior art, made the safety of working environment and environmental conservation be guaranteed. Simultaneously, owing to being provided with first, second heat exchanger in hydraulic oil closed loop pipeline structure, can will absorb the hydraulic oil of natural gas compressing heat, cooled when flowing through first, second heat exchanger, and the high heat that compressed natural gas produces, also can be cooled when flowing through three heat exchangers. It is thus possible to make simplifying the structure of hydraulic booster container, be conducive to processing and fabricating and Maintenance and Repair.

And; one is adopted to be connected by check valve hydraulic oil closed loop pipeline for the hydraulic oil JUMPS Automated Supplemental System that the leakage of hydraulic oil closed loop pipeline oil is supplemented; hydraulic oil closed loop pipeline can be implemented on-line checking repairing; do not need shutdown just can carry out hydraulic oil to supplement; to ensure hydraulic oil hydraulic system energy normal operation, improve gas station task performance. And the Leakage Energy that can will leak out in covering fuel tank is restored in closed loop pipeline again, does not need additionally to increase fresh oil, greatly saves cost.

Owing to described first, second, third heat exchanger all includes tubular shell, two end cap, some heat-exchange tubes, described cylindrical case body wall is provided with mean for the inlet and outlet that cooling medium passes through, described tubular shell and two end cap are fixedly connected to form cooling medium and pass through chamber, described two end cap is equipped with pipeline connecting hole, some heat-exchange tubes are arranged on cooling medium and pass through intracavity, spacing is left between each heat-exchange tube, the two ends of described heat-exchange tube connect with the pipeline connecting hole arranged in two end cap respectively, and the fluid for supply and demand cooling passes through. So ensure that sufficiently large cooling medium flows through cooling medium and passes through chamber, and allow the fluid that need to cool down from being located at cooling medium by the some heat-exchange tubes chamber flow through, the fluid that need to cool down is made to be assigned in each heat-exchange tube with cooling medium by the sufficiently conducted heat exchange of cooling medium in chamber, drastically increase heat exchanger effectiveness, it is achieved quickly cool.

The first oil vessel it is provided with between described First Heat Exchanger and hydraulic commutator, the upper port of the first oil vessel connects with First Heat Exchanger, the lower port of the first oil vessel connects with the first working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the first repairing; It is provided with the second oil vessel between described second heat exchanger and hydraulic commutator, the upper port of the second oil vessel connects with the second heat exchanger, the lower port of the second oil vessel connects with the second working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the second repairing. The hydraulic oil supplemented so can be made to initially enter oil vessel cushioned, ensure that hydraulic booster container has sufficient hydraulic oil to be operated simultaneously.

Described high-pressure oil pump adopts the high-pressure oil pump group composed in parallel by least two high-pressure oil pump, and the inlet parallel of each high-pressure oil pump is in the oil return pipe being connected with the oil return opening of hydraulic commutator, and each hydraulic oil delivery side of pump is parallel to the pressure port of hydraulic commutator.It is possible to realize redundancy pressurization function, it is to avoid each high-pressure oil pump overload operation, both can guarantee that the continuous-stable of pressurization, the service life of high-pressure oil pump can be extended again.

Being provided with acoustic filter between the outlet of described high-pressure oil pump and the pressure port of hydraulic commutator, this acoustic filter can reduce the noise that whistles sent in pressure process, is conducive to environmental protection. Pipeline between downstream and the pressure port of hydraulic commutator of described acoustic filter is provided with pressure unloading sensor, and the oil return pipe that is connected with the import of high-pressure oil pump by an off-load branch road is connected, this off-load branch road can adjust the hydraulic fluid pressure controlling high-pressure oil pump output, it is ensured that the closed loop hydraulic compression device normal operation of natural gas filling station.

Described supply air line arranges a straight-through bypass, this straight-through bypass stepped air-flow automatic switching control equipment, cross with supercharging air delivering pipeline and be connected the upstream extremity of compressed natural gas gas transmission main, thus can first with the aerating dosing machine supply that the pressure of source of the gas is natural gas filling station, closed loop hydraulic compression device is avoided to start power consumption too early, the power consumption of natural gas filling station can be reduced, save the energy.

Described supercharging air delivering pipeline arranges an Oil-gas Separation pressurizing vessel, the air inlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects the outlet pipe connecting hole of the 3rd heat exchanger by the supercharging air delivering pipeline of upstream, the gas outlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects compressed natural gas gas transmission main by the supercharging air delivering pipeline in downstream, the lower end of described Oil-gas Separation pressurizing vessel arranges leakage fluid dram, this leakage fluid dram connects oil feeding reservoir by stop valve, one liquid level sensor is arranged on pressurizing vessel inner chamber bottom, this liquid level sensor is electrically connected with the controller, and with two hydraulic booster container intracavity tops arrange for commutation control liquid level sensor formed insurance sender system. thus, the compressed natural gas after supercharging can either be made to remain stable for pressure, have and the hydraulic oil being mixed in natural gas can be isolated, improve the quality of compressed natural gas.

The closed loop hydraulic compression device of this natural gas filling station only needs the mode of one stage of compression, just can complete natural gas compressing aerating, and it is simpler that compression ring reduces the hydraulic booster machine structure that can make natural gas supply sub-station less, works safer, more environmentally-friendly.

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is a kind of embodiment of hydraulic booster container of the present utility model;

Fig. 3 is heat exchanger structure schematic diagram of the present utility model;

Fig. 4 is that the A-A of Fig. 3 is to sectional view;

Fig. 5 is a kind of embodiment of air-flow automatic switching control equipment of the present utility model;

Fig. 6 is that the A-A of Fig. 5 is to sectional view;

Fig. 7 is that the B-B of Fig. 5 is to sectional view;

Fig. 8 is that the C-C of Fig. 5 is to sectional view;

Fig. 9 is a kind of embodiment of Oil-gas Separation pressurizing vessel of the present utility model.

Detailed description of the invention

Referring to Fig. 1 to Fig. 9, a kind of embodiment of the closed loop hydraulic compression device of natural gas filling station, including first hydraulic booster container the 1, second hydraulic booster container 2, two hydraulic booster container upright are arranged, the upper end of each hydraulic booster container is provided with gas pipeline interface 104, lower end is provided with hydraulic oil pipeline interface 105, and two hydraulic booster container intracavity tops are equipped with the liquid level sensor 4 for commutation control. As shown in Figure 2, two hydraulic booster containers all include shell 101 and upper cover body 102, lower cover 103, make and assembling for making hydraulic booster container be easy to, the shell 101 of the present embodiment arranges female thread, upper cover body 102, lower cover 103 arrange external screw thread, described upper cover body 102, lower cover 103 are connected fixing with shell 101 by threaded engagement, set sealing ring 1011 and seal between upper cover body 102, lower cover 103 and shell 101;Or, shell 101 arranges external screw thread, upper cover body 102, lower cover 103 arrange female thread, described upper cover body 102, lower cover 103 are connected fixing with shell 101 by threaded engagement, and undertaken circumferentially positioned by lock screw 60, prevent assembling rear cover body from circumferentially rotating and cause loosening, set sealing ring 1011 between upper cover body 102, lower cover 103 and shell 101 and seal. Be provided with multiple blind hole 1021 in the outer face of upper cover body 102, lower cover 103, these blind holes 1021 are inserted for pulling tool and lid are rotated, and facilitate the threaded engagement assembly or disassembly of lid and shell 101. Certainly, described shell 101 and upper cover body 102, lower cover 103 can also pass through to be welded and fixed. Described upper cover body 102 arranges gas pipeline interface 104, the screwed hole threaded engagement that described gas pipeline interface 104 is arranged with upper cover body 102 is connected, and gas pipeline interface 104 is installed the liquid level sensor 4 for commutation control and connects acting gas pipe joint 1041. Described lower cover 103 arranges hydraulic oil pipeline interface 105, and the screwed hole threaded engagement that described hydraulic oil pipeline interface 105 is arranged with lower cover 103 is connected, and hydraulic oil pipeline interface 105 connects oil-way pipe joint 1051. Described liquid level sensor 4 adopts float type liquid level to switch, this float type liquid level switch is connected fixing by gas pipeline interface 104 with upper cover body 102, the support bar 401 of float type liquid level switch puts in hydraulic booster container chamber, the hinged float lever 402 in support bar 401 lower end, the frizzen 403 connected on float lever 402 extends gas pipeline interface 104, corresponding with the trigger 404 being arranged on outside gas pipeline interface 104, gas pipeline interface 104 connects acting gas pipe joint 1041.

The gas pipeline interface of described first hydraulic booster container the 1, second hydraulic booster container 2 connects supply air line 33 and supercharging air delivering pipeline 34 each through an air-flow automatic switching control equipment 5. Seeing shown in Fig. 5 to Fig. 8, the air-flow automatic switching control equipment 5 of the present embodiment may be configured as integrated pressure reversal valve, and described integrated pressure reversal valve includes valve body 5a, drive end bearing bracket 5b, rear end cap 5c, 501, two branching block 5d of four check valves. Described drive end bearing bracket 5b, rear end cap 5c are separately fixed at the rear and front end of valve body 5a, and the one side of described drive end bearing bracket 5b and valve body 5a laminating is provided with groove 5b2, is provided with a total air inlet 5b1 and communicates with groove 5b2, and this total air inlet 5b1 is for being connected with supply air line 33; The one side of described rear end cap 5c and valve body 5a laminating is provided with groove 5c2, is provided with a total gas outlet 5c1 and communicates with groove 5c2, and this total gas outlet 5c1 is for being connected with supercharging air delivering pipeline 34. Described valve body 5a is provided with the airway of two isolation, wherein first airway 502 one end communicates with the groove 5b2 of drive end bearing bracket 5b, the other end communicates with the groove 5c2 of rear end cap 5c, described valve body 5a is provided with the first blow vent 5a1 and the first airway 502 communicates, and the first blow vent 5a1 connects the gas pipeline interface 104 of the first hydraulic booster container 1 by acting gas pipe joint 1041; Second airway 503 one end communicates with the groove 5b2 of drive end bearing bracket 5b, the other end communicates with the groove 5c2 of rear end cap 5c, described valve body 5a is provided with the second blow vent 5a2 and the second airway 503 communicates, and the second blow vent 5a2 connects the gas pipeline interface 104 of the second hydraulic booster container 2 by acting gas pipe joint 1041. Described first airway 502 one end arranges check valve 501 and connects total air inlet 5b1 and the first blow vent 5a1, the corresponding total air inlet 5b1 in the go side of this check valve 501, the corresponding first blow vent 5a1 of not-go-end;Described first airway 502 other end arranges check valve 501 and connects the first blow vent 5a1 and total gas outlet 5c1, the corresponding first blow vent 5a1 in the go side of this check valve 501, the corresponding total gas outlet 5c1 of not-go-end. Described second airway 503 one end arranges check valve 501 and connects total air inlet 5b1 and the second blow vent 5a2, the corresponding total air inlet 5b1 in the go side of this check valve 501, the corresponding second blow vent 5a2 of not-go-end; Described second airway 503 other end arranges check valve 501 and connects the second blow vent 5a2 and total gas outlet 5c1, the corresponding second blow vent 5a2 in the go side of this check valve 501, the corresponding total gas outlet 5c1 of not-go-end. The natural gas via supply air line that can be made high-pressure air source by this air-flow automatic switching control equipment 5 is entered from total air inlet, automatically select blow vent to flow to the hydraulic booster container being in low pressure, after completing compression supercharging in this hydraulic booster container, discharge through the total gas outlet of blow vent automatic stream, air-flow automatic switching control equipment is thus made alternately to control air inlet and the aerofluxus of first, second hydraulic booster container, it is achieved the continued compression gas transmission to natural gas. Or, described air-flow automatic switching control equipment 5 can also adopt the mode that trachea and multiple check valve connect combination to realize. The downstream of general export 5c1, the 3rd heat exchanger 3a that described supercharging air delivering pipeline 34 is provided with the upstream extremity connection air-flow automatic switching control equipment 5 of the 3rd heat exchanger 3a for cooled natural gas, the 3rd heat exchanger 3a connects supercharging air delivering pipeline 34.

The hydraulic oil pipeline interface of described first hydraulic booster container 1 is by connecting for the First Heat Exchanger 3b of coolant force feed and the first working hole 9a of a hydraulic commutator 9, connected by the first defeated pressure pipe road 10 between First Heat Exchanger 3b and a hydraulic commutator 9, the hydraulic oil pipeline interface of described second hydraulic booster container 2 is by connecting with the second working hole 9b of this hydraulic commutator 9 for the second heat exchanger 3c of coolant force feed, it is connected by the second defeated pressure pipe road 11 between second heat exchanger 3c with this hydraulic commutator 9, the pressure port 9c of described hydraulic commutator 9 and the outlet of high-pressure oil pump 15, export at high-pressure oil pump 15 and the pressure duct 12 being connected between the pressure port 9c of hydraulic commutator 9 arranges a check valve 14, the outlet of the go side correspondence high-pressure oil pump 15 of this check valve 14, the oil return opening 9d of described hydraulic commutator 9 is connected by oil return pipe 16 with the import of high-pressure oil pump 15, form hydraulic oil closed loop pipeline structure. described hydraulic commutator 9 adopts electro-hydraulic two-position four-way valve or electro-hydraulic three-position four-way valve all can achieve the goal effect.

See shown in Fig. 3, Fig. 4, fabrication and installation for ease of heat exchanger, described first, second, third heat exchanger all includes tubular shell 311, two end cap 321, some heat-exchange tubes 3, being provided with mean for import 3112 and outlet 3113 that cooling medium passes through on described tubular shell 311 wall, described tubular shell 311 and two end cap 321 are fixedly connected to form cooling medium by chamber 3111. Being equipped with pipeline connecting hole 3212 in described two end cap 321, some heat-exchange tubes 3 are arranged on cooling medium by, in chamber 3111, leaving spacing and pass through for cooling medium between each heat-exchange tube 3. The two ends of described heat-exchange tube 3 connect with the pipeline connecting hole 3212 arranged in two end cap 321 respectively, fluid for supply and demand cooling passes through, wherein, flow through compressed natural gas for the heat-exchange tube 3 of the 3rd heat exchanger 3a of cooled natural gas to realize heat exchange and cool, flow through hydraulic oil for the heat-exchange tube 3 of the First Heat Exchanger 3b of coolant force feed, the second heat exchanger 3c and realize heat exchange and cool.The two ends of described heat-exchange tube 3 are connected fixing respectively through connecting seat 331 with end cap 321, each end cap 321 is equipped with groove 3213 and communicates with pipeline connecting hole 3212. The described groove 3213 that can also arrange on groove 332 and end cap 321 on seat 331 that connects forms chamber in opposite directions. For making these some heat-exchange tubes 3 can keep spacing, in the stage casing of heat-exchange tube 3, one or more gripper shoe 3d can be set, gripper shoe 3d is provided with some heat-exchange tubes hole, location and cooling medium via 3f, hole, heat-exchange tube location is formed through location for heat-exchange tube, cooling medium via 3f flows through for cooling medium, and gripper shoe 3d supports with being connected fixing formation of seat 331 with many support bar 3e. Described First Heat Exchanger 3a, the second heat exchanger 3b, the 3rd heat exchanger 3c cooling medium import and export connect cooling medium circulation line. The present embodiment is adopted and is used water as cooling medium, it is possible to decrease cost, and the cooling medium inlet of three heat exchangers connects the suction pump outlet of water tank by pipeline, and the cooling medium outlet of three heat exchangers connects water tank by pipeline. Certainly, oil can also be adopted as cooling medium when disregarding cost.

One is connected with hydraulic oil closed loop pipeline by check valve 24 for the hydraulic oil JUMPS Automated Supplemental System 20 that the leakage of hydraulic oil closed loop pipeline oil is supplemented. the hydraulic oil JUMPS Automated Supplemental System 20 of the present embodiment includes slippage pump 23, oil feeding reservoir 21, liquid level detector 22, mends oil control valve group 26. the entrance point of described slippage pump 23 connects oil feeding reservoir 21, and the port of export pipeline of slippage pump 23 is provided with Pressure gauge 25 and mends oil control valve group 26, the port of export pipeline of slippage pump 23 and being connected with hydraulic oil closed loop pipeline by check valve 24. described liquid level detector 22 is located in oil feeding reservoir, described benefit oil control valve group 26 includes pilot operated compound relief valve and two position two-way valve, the import of described pilot operated compound relief valve is connected with pipeline, the outlet of pilot operated compound relief valve connects oil feeding reservoir, and the remote control orifice of pilot operated compound relief valve connects oil feeding reservoir by two position two-way valve. oil pressure during repairing is automatically controlled by benefit oil control valve group 26, when the oil pressure of slippage pump 23 conveying is too high, can from mending oil control valve group 26 overflow pressure relief, it is to avoid affect normal operation because oil compensation pressure is too high. and, the closed loop hydraulic compression device of this natural gas filling station is provided with the high-pressure hose 35 for being quickly connected with the storage tank interface of natural gas transportation tank car 54 in the import of supply air line 33, this supply air line 33 is provided with mean for atmospheric pressure sensor 36, check valve 37, air filter 38, and first controls valve, Pressure gauge etc. supply air line 33 arranges a straight-through bypass 42, this straight-through bypass 42 is located between air filter 38 and air-flow automatic switching control equipment 5, this straight-through bypass 42 stepped air-flow automatic switching control equipment 5, crossing with supercharging air delivering pipeline 34 and be connected the upstream extremity of compressed natural gas gas transmission main 44, the downstream of described compressed natural gas gas transmission main 44 arranges multiple interface 45 for being connected with air entraining substation air delivering pipeline. described supercharging air delivering pipeline 34 arranges an Oil-gas Separation pressurizing vessel 30, as shown in Figure 9, the air inlet 30a that this Oil-gas Separation pressurizing vessel 30 upper end is arranged connects the outlet pipe connecting hole of the 3rd heat exchanger 3a by the supercharging air delivering pipeline 34 of upstream, the gas outlet 30b that this Oil-gas Separation pressurizing vessel 30 upper end is arranged connects compressed natural gas gas transmission main 44 by the supercharging air delivering pipeline 34 in downstream, the lower end of described Oil-gas Separation pressurizing vessel 30 arranges leakage fluid dram 30c, this leakage fluid dram 30c connects oil feeding reservoir 21 by stop valve 31 through oil pipe 32, described stop valve 31 adopts pneumatic ball valve effect to be preferred.One liquid level sensor 4a is arranged on Oil-gas Separation pressurizing vessel 30 inner chamber bottom, and this liquid level sensor 4a electrically connects with controller 6, and the liquid level sensor 4 for commutation control arranged with two hydraulic booster container intracavity tops forms insurance sender system. The supercharging air delivering pipeline 34 of described Oil-gas Separation pressurizing vessel 30 air inlet 30a upstream is provided with boost-pressure sensor 39, pressure switch 40, and Pressure gauge etc., the supercharging air delivering pipeline 34 in 30b downstream, Oil-gas Separation pressurizing vessel 30 gas outlet can also set up gas grease trap 41. Described liquid level sensor 4, high-pressure oil pump 15, hydraulic commutator 9, liquid level detector 22, slippage pump 23 electrically connect with controller 6. Described controller 6 adopts PLC to be preferred.

The top of the Oil-gas Separation pressurizing vessel 30 of the present embodiment arranges a gas and oil separating plant 301 and stretches into Oil-gas Separation pressurizing vessel 30 intracavity, described gas and oil separating plant 301 arranges the air inlet 30a and gas outlet 30b of Oil-gas Separation pressurizing vessel 30, described air inlet 30a connects the supercharging air delivering pipeline 34 of upstream, and described gas outlet 30b connects the supercharging air delivering pipeline in downstream. described gas and oil separating plant 301 is provided with an outer tube 303, and outer tube 303 upper end connects with gas outlet 30b, and lower end blocks, and described outer tube 303 epimere sidewall is provided with passage, and stage casing tube wall is imperforate section, and hypomere tube wall is provided with some little oblique through holes. in one, pipe 302 is positioned at outer tube 303, spatial joint clearance is left between interior pipe 302 and outer tube 303, interior pipe 302 upper end connection air inlet 30a, lower end blocks, said inner tube 302 lower semisection tube wall is provided with some little oblique through holes, it is corresponding with the imperforate section tube wall of outer tube 303 that interior pipe 302 is provided with the wall section of some little oblique through holes, in spatial joint clearance between interior pipe 302 and outer tube 303, arrange a sealing ring 304 to be cut off by the little oblique through hole of the passage of outer tube 303 with interior pipe 302, make compressed natural gas can not be directly entered the gas outlet 30b of outer tube connection from the spatial joint clearance between inner and outer pipes, spatial joint clearance must be flowed through from the little oblique through hole of interior pipe 302 tube wall and form eddy flow entrance Oil-gas Separation pressurizing vessel 30 intracavity from the little oblique through hole of outer tube 303, after the liquid mixed in natural gas is separated, natural gas is discharged from the ventilation aperture gas outlet 30b of outer tube 303 upper portion side wall again, it is achieved in stablizing air pressure, the function of hydraulic oil can be isolated again. the liquid level sensor 4a being arranged on Oil-gas Separation pressurizing vessel 30 intracavity adopts high voltage bearing float type liquid level switch, the support bar 401 of this float type liquid level switch is fixed on the mounting seat 30d of intracavity bottom setting of Oil-gas Separation pressurizing vessel 30, support bar 401 upper end thereof one float lever 402, the frizzen 403 connected on float lever 402 extends Oil-gas Separation pressurizing vessel 30 lower end, corresponding with the trigger 404 installed, float lifts along with putting aside the eustasy of oily liquid level in Oil-gas Separation pressurizing vessel 30, frizzen 403 is driven to contact with trigger 404 or separate, thus make trigger 404 to controller 6 sender, by controller, the leakage fluid dram 30c stop valve 31 connected is controlled. this float type liquid level switch has explosion-proof performance, the sender of the state that puts in place that is suitable to rise at the inflammable condition perception liquid level of high pressure. or, described liquid level sensor may be used without ultrasonic sensor or other is suitable to the sensor of high pressure Flammable atmosphere use to detect liquid level, can achieve the goal equally. adopt the Oil-gas Separation pressurizing vessel 30 of this structure, make the compressed natural gas after supercharging can be output by the pressure that Oil-gas Separation pressurizing vessel remains stable for, the gas and oil separating plant that can pass through to arrange again is by separated from the gas for the fluid being likely in compressed natural gas be mixed with, isolated fluid is made to be accumulated in Oil-gas Separation pressurizing vessel bottom, when the fluid accumulating fluid reaches the highest order that liquid level sensor sets, stop valve automatically turns on, the fluid making savings flows back in oil feeding reservoir, after liquid level sensor detects lowest order signal, stop valve is automatically switched off, stop discharge opeing, the compressed natural gas being therefore prevented from being contaminated with fluid is added in the automobile of aerating, avoid result in automobile engine fault.

This utility model is not limited solely to above-described embodiment, the first oil vessel 7 can also be provided with between described First Heat Exchanger 3b and hydraulic commutator 9, the upper port of the first oil vessel 7 connects with First Heat Exchanger 3b, the lower port of the first oil vessel 7 is connected with the first working hole 9a of hydraulic commutator 9 by the first defeated pressure pipe road 10, the first defeated pressure pipe road 10 and be in charge of 28a connection hydraulic oil JUMPS Automated Supplemental System 20 by the first repairing; It is provided with the second oil vessel 8 between described second heat exchanger 3c and hydraulic commutator 9, the upper port of the second oil vessel 8 connects with the second heat exchanger 3c, the lower port of the second oil vessel 8 is connected with the second working hole 9b of hydraulic commutator 9 by the second defeated pressure pipe road 11, the second defeated pressure pipe road 11 and be in charge of 28b connection hydraulic oil JUMPS Automated Supplemental System 20 by the second repairing. 28a is in charge of in described first repairing, the second repairing is in charge of on 28b and is respectively provided with check valve 29, the not-go-end of the check valve 24 that the repairing house steward 27 of the go side correspondence hydraulic oil JUMPS Automated Supplemental System 20 of this check valve 29 is arranged. Described check valve 24 can prevent hydraulic oil recoil from nourishing oil pump 23, and the check valve 29 that two repairings are in charge of can make the hydraulic oil that supplements for the pressure reduction on two defeated pressure pipe roads, automatically selects the low defeated pressure pipe road of pressure and carries out hydraulic oil and supplement. Described hydraulic oil JUMPS Automated Supplemental System 20 can also arrange the 3rd repairing on repairing house steward 27 and be in charge of 28c and connect with the oil return pipe 16 of 15 imports that are connected high-pressure oil pump, is in charge of 28c in the 3rd repairing and is again provided with check valve. The symmetrical setting of described first oil vessel the 7, second oil vessel 8 is arranged, the volume of each oil vessel all adopts better more than or equal to the volume effects of corresponding hydraulic booster container, both can guarantee that the hydraulic oil of sufficient quantity was supplied to hydraulic booster container, also can guarantee that the natural gas in hydraulic booster container was compressed by stable pressure; Certainly, the volume of oil vessel can be implemented as hydraulic booster container equally less than corresponding hydraulic booster container and provides hydraulic oil.

This utility model is also not only limited to above-described embodiment, described high-pressure oil pump 15 exports and arranges acoustic filter 13 on the pressure duct 12 between the pressure port 9c of hydraulic commutator 9, the outlet of high-pressure oil pump 15 is connected through the upstream extremity of check valve 14 with acoustic filter 13, and the downstream of acoustic filter 13 is connected with the pressure port 9c of hydraulic commutator 9. And, pressure duct 12 between the downstream and the pressure port 9 of hydraulic commutator 9 of acoustic filter 13 can also arrange pressure unloading sensor 19, and the oil return pipe 16 that is connected with the import of high-pressure oil pump 15 by an off-load branch road 17 is connected, this off-load branch road 17 is provided with overflow valve 18. Pressure unloading sensor 19 electrically connects with PLC 6, gathered, by pressure unloading sensor 19, the pressure signal that high-pressure oil pump 15 exports and be transferred to PLC 6, adjust the hydraulic fluid pressure controlling high-pressure oil pump 15 output, it is ensured that the inner-cooled hydraulic booster machine normal operation of natural gas supply sub-station.

On the basis of above-described embodiment, described high-pressure oil pump 15 can also adopt the high-pressure oil pump group composed in parallel by least two high-pressure oil pump, the inlet parallel of each high-pressure oil pump 15 in the oil return opening 9d of hydraulic commutator 9 oil return pipe 16 being connected, the outlet of each high-pressure oil pump 15 is parallel to the upstream extremity of acoustic filter 13 respectively through check valve 14; Or the pressure port 9c of hydraulic commutator 9 it is parallel to when not setting acoustic filter 13.The high-pressure oil pump group of the present embodiment adopts two high-pressure oil pumps of parallel-connection structure, thus, can realize redundancy pressurization function, it is ensured that the continuous-stable of pressurization, can reduce again the noise that whistles sent in pressure process, be conducive to environmental protection.

High-pressure oil pump 15 of the present utility model adopts plunger-type high pressure oil pump to be preferred so that it is can meet height and be pressed into, the needs that supercharging goes out, as long as or disclosure satisfy that height is pressed into, supercharging goes out the high-pressure oil pump of condition, is also applied for the technical solution of the utility model.

The leakage point of described high-pressure oil pump 15 is connected with oil feeding reservoir 21 by Leakage Energy pipeline 55, and can also arrange Air cooler 56 Leakage Energy pipeline 55 is carried out wind cooling temperature lowering, makes the hydraulic oil of leakage then flow into after supercooling in oil feeding reservoir 21.

The closed loop hydraulic compression device of this natural gas filling station adopts integration to assemble integrated morphology, after factory completes assembling, natural gas supply sub-station can be transported to by complete machine, it is connected by the interface 45 being used for being connected with air entraining substation air delivering pipeline can use with the pipeline of air entraining substation, install and use more convenient, being conducive to the construction of natural gas supply sub-station.

When this utility model uses, the high-pressure oil pump 15 that first can not start hydraulic oil closed loop pipeline works, and allows and forms pressure drag in hydraulic oil closed loop pipeline, first with the compressed natural gas pressure of natural gas transportation tank car 54 gas bomb, for supply air line 33 gas transmission. supply for air entraining substation owing to the pressure drag of hydraulic oil closed loop pipeline makes natural gas automatically select straight-through bypass 42 compressed natural gas transmission house stewards 44. after the compressed natural gas pressure of natural gas transportation tank car 54 gas bomb reduces, the high-pressure oil pump 15 restarting hydraulic oil closed loop pipeline works, it is alternately the first hydraulic booster container 1, second hydraulic booster container 2 provides hydraulic oil that the natural gas entering hydraulic booster container is compressed, natural gas is made to alternately enter the first hydraulic booster container 1 of hydraulic oil closed loop pipeline through air-flow automatic switching control equipment 5 from supply air line 33, second hydraulic booster container 2 obtains compression supercharging, and continue to carry from supercharging air delivering pipeline 34 to compressed natural gas gas transmission main 44, supply for air entraining substation. owing to first hydraulic booster container the 1, second hydraulic booster container 2 is by hydraulic oil closed loop pipeline connection, in the process of alternately supercharging, the overbottom pressure of the compressed natural gas of natural gas transportation tank car gas bomb can be made full use of, overbottom pressure converting to air inlet kinetic energy and off-load kinetic energy, is combined with the hydraulic-driven kinetic energy of hydraulic oil closed loop pipeline structure, making high-pressure oil pump pressurize need not from 0MPa, but pressurization from the overbottom pressure of natural gas, shorten boosting stroke, a large amount of kinetic energy can be saved, reduce energy consumption. and owing to being provided with the 3rd heat exchanger for cooled natural gas on supercharging air delivering pipeline 34, make the cooled cooling of heat of the compressed natural gas after supercharging, and owing to hydraulic oil closed loop pipeline is provided with first, second heat exchanger for coolant force feed, make the hydraulic oil of first hydraulic booster container the 1, second hydraulic booster container 2 when first, second heat exchanger, cooled, drastically increase cooling efficiency, be avoided that the security incident caused because of compression heating occurs. hydraulic oil JUMPS Automated Supplemental System 20 by arranging simultaneously, supplements for the leakage of hydraulic oil closed loop pipeline oil is carried out on-line checking, to ensure hydraulic system energy normal operation, and improves work efficiency. and the Leakage Energy that can will leak out in covering fuel tank is restored in closed loop pipeline again, does not need additionally to increase fresh oil, greatly saves cost. the liquid level detector 22 of described hydraulic oil JUMPS Automated Supplemental System 20 adopts floating ball type liquid level detector, gathered by liquid level detector 22 and be set in the highest liquid level of oil mass in oil feeding reservoir 21 and hydraulic pressure oil mass that minimum liquid level is monitored in oil feeding reservoir, thus the hydraulic pressure oil mass monitored in hydraulic oil closed loop pipeline.The hydraulic oil detected in oil feeding reservoir 21 when liquid level detector 22 reaches the highest liquid level, then represent that the Leakage Energy of hydraulic oil closed loop pipeline flows back in oil feeding reservoir 21, hydraulic oil in hydraulic oil closed loop pipeline reduces because of leakage, oil mass need to be supplemented, liquid level detector 22 sender is to PLC 6, controlled slippage pump 23 by PLC 6 and start work, be hydraulic oil closed loop pipeline repairing automatically; The hydraulic oil detected in oil feeding reservoir 21 when liquid level detector 22 reaches minimum liquid level, then represent that the hydraulic oil in hydraulic oil closed loop pipeline is sufficient, need to stopping repairing, liquid level detector 22 sender, to PLC, is controlled slippage pump 23 by PLC and is automatically stopped repairing work. When carrying out automatic repairing, being in charge of the check valve 29 of the upper setting pressure reduction according to the 10, second defeated pressure pipe road 11, the first defeated pressure pipe road by two repairings, oil is filled into by the defeated pressure pipe road automatically selecting pressure low.

Claims (10)

1. the closed loop hydraulic compression device of a natural gas filling station, including the first hydraulic booster container, second hydraulic booster container, two hydraulic booster container upright are arranged, the upper end of each hydraulic booster container is provided with gas pipeline interface, lower end is provided with hydraulic oil pipeline interface, it is characterized in that: two hydraulic booster container intracavity tops are equipped with the liquid level sensor for commutation control, described first hydraulic booster container, the gas pipeline interface of the second hydraulic booster container connects supply air line and supercharging air delivering pipeline each through an air-flow automatic switching control equipment, described supercharging air delivering pipeline is provided with the 3rd heat exchanger for cooled natural gas, the hydraulic oil pipeline interface of described first hydraulic booster container is by connecting for the First Heat Exchanger of coolant force feed and the first working hole of a hydraulic commutator, the hydraulic oil pipeline interface of described second hydraulic booster container is by connecting with the second working hole of this hydraulic commutator for the second heat exchanger of coolant force feed, the pressure port of this hydraulic commutator and the outlet of high-pressure oil pump, the oil return opening of this hydraulic commutator and the inlet communication of high-pressure oil pump, form hydraulic oil closed loop pipeline structure, one is connected with hydraulic oil closed loop pipeline by check valve for the hydraulic oil JUMPS Automated Supplemental System that the leakage of hydraulic oil closed loop pipeline oil is supplemented, the cooling medium import and export of described first, second, third heat exchanger connects cooling medium circulation line, described liquid level sensor, high-pressure oil pump, hydraulic commutator are electrically connected with the controller.

2. the closed loop hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: described first, second, 3rd heat exchanger all includes tubular shell, two end cap, some heat-exchange tubes, described cylindrical case body wall is provided with mean for the inlet and outlet that cooling medium passes through, described tubular shell and two end cap are fixedly connected to form cooling medium and pass through chamber, described two end cap is equipped with pipeline connecting hole, some heat-exchange tubes are arranged on cooling medium and pass through intracavity, spacing is left between each heat-exchange tube, the two ends of described heat-exchange tube connect with the pipeline connecting hole arranged in two end cap respectively, fluid for supply and demand cooling passes through.

3. the closed loop hydraulic compression device of natural gas filling station according to claim 2, it is characterised in that: the two ends of described heat-exchange tube are connected fixing respectively through connecting seat with end cap, each end cap is equipped with groove and communicates with pipeline connecting hole.

4. the inner-cooled hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: between described First Heat Exchanger and hydraulic commutator, be provided with the first oil vessel, the upper port of the first oil vessel connects with First Heat Exchanger, the lower port of the first oil vessel connects with the first working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the first repairing;It is provided with the second oil vessel between described second heat exchanger and hydraulic commutator, the upper port of the second oil vessel connects with the second heat exchanger, the lower port of the second oil vessel connects with the second working hole of hydraulic commutator, and is in charge of connection hydraulic oil JUMPS Automated Supplemental System by the second repairing.

5. the closed loop hydraulic compression device of the natural gas filling station according to claim 1 or 4, it is characterized in that: described hydraulic oil JUMPS Automated Supplemental System includes slippage pump, oil feeding reservoir, liquid level detector, benefit oil control valve group, the entrance point of described slippage pump connects oil feeding reservoir, the port of export pipeline of slippage pump is provided with Pressure gauge and mends oil control valve group, the port of export pipeline of slippage pump and being connected with hydraulic oil closed loop pipeline by check valve, described liquid level detector is located in oil feeding reservoir, and described liquid level detector, slippage pump are electrically connected with the controller.

6. the closed loop hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: two hydraulic booster containers all include shell and upper and lower cover body, described upper and lower cover body is connected fixing with shell by threaded engagement, set sealing ring between upper and lower cover body and shell to seal, described upper cover body arranges gas pipeline interface, this gas pipeline interface installs the liquid level sensor for commutation control, and described lower cover arranges hydraulic oil pipeline interface.

7. the closed loop hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: described high-pressure oil pump adopts the high-pressure oil pump group composed in parallel by least two high-pressure oil pump, the inlet parallel of each high-pressure oil pump is in the oil return pipe being connected with the oil return opening of hydraulic commutator, and each hydraulic oil delivery side of pump is parallel to the pressure port of hydraulic commutator.

8. the closed loop hydraulic compression device according to the arbitrary described natural gas filling station of claim 1 or 7, it is characterised in that: described high-pressure oil pump adopts plunger-type high pressure oil pump.

9. the closed loop hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: between the outlet of described high-pressure oil pump and the pressure port of hydraulic commutator, be provided with acoustic filter, hydraulic oil delivery side of pump is connected with the upstream extremity of acoustic filter through check valve, and the downstream of acoustic filter is connected with the pressure port of hydraulic commutator; Pipeline between downstream and the pressure port of hydraulic commutator of described acoustic filter is provided with pressure unloading sensor, and the oil return pipe being connected with the import of high-pressure oil pump by an off-load branch road is connected, and this off-load branch road is provided with overflow valve.

10. the closed loop hydraulic compression device of natural gas filling station according to claim 1, it is characterized in that: described supply air line arranges a straight-through bypass, this straight-through bypass stepped air-flow automatic switching control equipment, crossing with supercharging air delivering pipeline and be connected the upstream extremity of compressed natural gas gas transmission main, the downstream of described compressed natural gas gas transmission main arranges multiple interface for being connected with air entraining substation air delivering pipeline, described supercharging air delivering pipeline arranges an Oil-gas Separation pressurizing vessel, the air inlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects the outlet pipe connecting hole of the 3rd heat exchanger by the supercharging air delivering pipeline of upstream, the gas outlet that this Oil-gas Separation pressurizing vessel upper end is arranged connects compressed natural gas gas transmission main by the supercharging air delivering pipeline in downstream, the lower end of described Oil-gas Separation pressurizing vessel arranges leakage fluid dram, this leakage fluid dram connects oil feeding reservoir by stop valve, one liquid level sensor is arranged on pressurizing vessel inner chamber bottom, this liquid level sensor is electrically connected with the controller, and with two hydraulic booster container intracavity tops arrange for commutation control liquid level sensor formed insurance sender system.