CN220551780U - LNG gas cylinder supercharging device - Google Patents
LNG gas cylinder supercharging device Download PDFInfo
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- CN220551780U CN220551780U CN202322112064.8U CN202322112064U CN220551780U CN 220551780 U CN220551780 U CN 220551780U CN 202322112064 U CN202322112064 U CN 202322112064U CN 220551780 U CN220551780 U CN 220551780U
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- 239000007789 gas Substances 0.000 claims abstract description 128
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 96
- 230000008016 vaporization Effects 0.000 claims abstract description 88
- 239000003345 natural gas Substances 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000009834 vaporization Methods 0.000 claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 20
- 239000006200 vaporizer Substances 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000003949 liquefied natural gas Substances 0.000 abstract description 88
- 238000012360 testing method Methods 0.000 abstract description 13
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
Abstract
The utility model discloses an LNG (liquefied Natural gas) cylinder pressurizing device, which comprises a vaporization pressurizing flow path formed on the LNG cylinder pressurizing device, wherein the vaporization pressurizing flow path is respectively used for communicating a liquid outlet and an air inlet of a cylinder to be pressurized; the vaporizing and pressurizing flow path is sequentially provided with a vaporizing device and a pressurizing pump, and the vaporizing device is used for vaporizing natural gas liquid flowing out from a liquid outlet of the gas cylinder to be pressurized; the booster pump is used for sucking the liquid outlet of the gas cylinder to form negative pressure, and is used for pressurizing the gasified natural gas and then sending the gasified natural gas into the gas inlet of the gas cylinder to be pressurized. According to the technical scheme, the LNG gas cylinder supercharging device can realize rapid supercharging required by an LNG gas cylinder air tightness test.
Description
Technical Field
The utility model relates to the technical field of air tightness detection devices, in particular to an LNG (liquefied Natural gas) cylinder pressurizing device.
Background
With the rapid development of the modern Liquefied Natural Gas (LNG) industry, LNG is used as clean fossil energy, and the application field of the LNG is wider and wider because the LNG has the characteristics of convenient transportation, flexible use, safety, reliability, no restriction by a pipe network and the like.
The automobile-used LNG gas cylinder belongs to one kind of low temperature adiabatic gas cylinder, can reach the purpose that reduces the gas cylinder and leak hot and make LNG long-term storage under low temperature. The LNG gas cylinder for the vehicle belongs to special equipment, and in order to keep safe and stable operation, an airtight test is required, the qualification standard of the LNG gas cylinder is that the gas cylinder is kept for 1 minute under the nominal working pressure, and the whole gas cylinder is checked to be free of leakage.
In the current periodic inspection process, the trouble of difficult pressurization and slow pressurization is often encountered. If the pressure in the gas cylinder is insufficient in the gas tightness test, the pressure in the gas cylinder needs to be increased to the nominal working pressure; the current pressurization equipment of the gas cylinder is a self-contained pressurization system. During pressurizing operation, a valve of the pressurizing system is opened, liquefied natural gas in the gas cylinder flows out to the heat exchange tube under the action of gravity, and the vaporized gaseous natural gas returns to the gas cylinder, so that the pressure in the gas cylinder is raised. The pressurizing speed depends on gravitational potential energy of liquefied natural gas, and when the liquid level in the gas cylinder is low or the flowing resistance of the pressurizing system is large, the pressurizing speed is low, and even the pressurizing cannot be performed. And because the LNG gas cylinder for the vehicle is difficult to disassemble, the regular test is generally carried out in an online mode, and the pressurization and the air tightness test of the gas cylinder cannot be carried out by accessing inert gas from the outside. Therefore, it is necessary to develop a rapid pressurization device suitable for the airtight test of the LNG gas cylinder for vehicles.
Disclosure of Invention
The utility model mainly aims to provide an LNG gas cylinder supercharging device, and aims to provide an LNG gas cylinder supercharging device capable of achieving rapid supercharging of an LNG gas cylinder.
In order to achieve the above object, the present utility model provides an LNG cylinder pressurizing device, comprising: a vaporization pressurizing flow path is formed on the LNG gas cylinder pressurizing device and is used for communicating a liquid outlet and an air inlet of a gas cylinder to be pressurized respectively;
the vaporizing and pressurizing flow path is sequentially provided with a vaporizing device and a pressurizing pump, and the vaporizing device is used for vaporizing natural gas liquid flowing out from a liquid outlet of the gas cylinder to be pressurized;
the booster pump is used for pressurizing the vaporized natural gas and then sending the natural gas into an air inlet of the air cylinder to be pressurized.
Optionally, a buffer device is further arranged on the vaporizing pressurization flow path, and the buffer device is arranged between the vaporizing device and the booster pump and is used for buffering the vaporized natural gas.
Optionally, the buffer device is set to a buffer tank, and an air pressure monitoring mechanism and a pressure relief structure are arranged on the buffer tank.
Optionally, the booster pump includes:
the pump body is internally provided with a cavity for compressing the inflow natural gas, and the compressed natural gas flows out through the vaporization pressurizing flow path;
the pump coaxial piston is arranged along the inside of the pump body, and reciprocates along the cavity to suck and compress natural gas by the small piston; the method comprises the steps of,
and the driving part comprises a large piston and is used for driving the pump coaxial piston to reciprocate.
Optionally, the driving part is set to the gas driving part, the gas driving part still includes drive air source control assembly, drive air source control assembly sets up on drive air source air route, drive air source control assembly includes air-vent valve, atmospheric pressure monitoring mechanism and ooff valve, be the series arrangement between air-vent valve, atmospheric pressure monitoring mechanism and the ooff valve, the air supply loops through the air-vent valve atmospheric pressure monitoring mechanism with the ooff valve.
Optionally, a plurality of spring check valves are further arranged on the vaporization pressurization flow path, one spring check valve is located between the buffer device and the booster pump, and the other spring check valve is located between the booster pump and the gas cylinder to be pressurized.
Optionally, an air pressure monitoring mechanism and/or a pressure relief structure is further arranged on the vaporization pressurizing flow path, and the air pressure monitoring mechanism and/or the pressure relief structure is positioned between the pressurizing pump and the air cylinder to be pressurized.
Optionally, the vaporizing device comprises a vaporizer, and the vaporizer is configured as a room temperature vaporizer.
Optionally, the vaporizing pressurizing flow path is further provided with a plurality of one-way stop valves, one-way stop valve is located between the gas cylinder to be pressurized and the vaporizing device, and the other one-way stop valve is located between the vaporizing device and the booster pump.
Optionally, the device further comprises a moving assembly, the moving assembly comprises a supporting part and moving parts, the number of the moving assemblies is 2, the vaporization device is arranged on the supporting part of one moving assembly, the booster pump is arranged on the supporting part of the other moving assembly, and the moving assemblies are detachably connected through a connecting structure.
According to the technical scheme, the LNG gas cylinder pressurizing device is provided with a vaporization pressurizing flow path, the vaporization pressurizing flow path is used for communicating a liquid outlet and a gas inlet of an LNG gas cylinder to be pressurized, the vaporization pressurizing flow path is sequentially provided with a vaporizing device and a pressurizing pump, LNG liquid flows out from the liquid outlet, flows to the vaporizing device through the vaporization pressurizing flow path, is vaporized into gaseous natural gas by the vaporizing device and flows out from the vaporizing device, flows to the pressurizing pump through the vaporization pressurizing flow path, the pressurizing pump pressurizes low-pressure natural gas, when the pressurizing pump operates, the pressurizing pump can suck and compress the natural gas at an inlet of the pressurizing pump and then discharges the natural gas, negative pressure or low pressure is formed at an inlet of the pressurizing pump, and the LNG liquid is the lowest pressure of a whole system pipeline and is the circulating power of a system medium; the pressure difference formed by the low pressure on one side and the high pressure on the other side of the booster pump enables LNG liquid to flow out from the liquid outlet and enter the vaporizing device, and the volume of the LNG liquid is 625 times of the volume of the LNG liquid with the same mass under the atmospheric pressure, so that when the LNG liquid is vaporized into the natural gas, the natural gas is conveyed back to the gas cylinder to be pressurized through the vaporizing pressurizing flow path, the pressure of the gas cylinder to be pressurized can be quickly increased, and the effect of quickly pressurizing the LNG gas cylinder is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an embodiment of an LNG cylinder pressurizing device according to the present utility model;
fig. 2 is a schematic flow chart of another embodiment of the pressurization device for LNG cylinders provided by the present utility model;
fig. 3 is a plan view of a pressurizing device for an LNG cylinder according to another embodiment of the present utility model;
fig. 4 is a plan view structure diagram of a booster pump in the LNG cylinder booster unit provided by the utility model in fig. 3.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
With the rapid development of the modern Liquefied Natural Gas (LNG) industry, LNG is used as clean fossil energy, and the application field of the LNG is wider and wider because the LNG has the characteristics of convenient transportation, flexible use, safety, reliability, no restriction by a pipe network and the like.
The automobile-used LNG gas cylinder belongs to one kind of low temperature adiabatic gas cylinder, can reach the purpose that reduces the gas cylinder and leak hot and make LNG long-term storage under low temperature. The LNG gas cylinder for the vehicle belongs to special equipment, and in order to keep safe and stable operation, an airtight test is required, the qualification standard of the LNG gas cylinder is that the gas cylinder is kept for 1 minute under the nominal working pressure, and the whole gas cylinder is checked to be free of leakage.
In the current periodic inspection process, the trouble of difficult pressurization and slow pressurization is often encountered. If the pressure in the gas cylinder is insufficient in the gas tightness test, the pressure in the gas cylinder needs to be increased to the nominal working pressure; the current pressurization equipment of the gas cylinder is a self-contained pressurization system. During pressurizing operation, a valve of the pressurizing system is opened, liquefied natural gas in the gas cylinder flows out to the heat exchange tube under the action of gravity, and the vaporized gaseous natural gas returns to the gas cylinder, so that the pressure in the gas cylinder is raised. The pressurizing speed depends on gravitational potential energy of liquefied natural gas, and when the liquid level in the gas cylinder is low or the flowing resistance of the pressurizing system is large, the pressurizing speed is low, and even the pressurizing cannot be performed. And because the LNG gas cylinder for the vehicle is difficult to disassemble, the regular test is generally carried out in an online mode, and the pressurization and the air tightness test of the gas cylinder cannot be carried out by accessing inert gas from the outside. Therefore, it is necessary to develop a rapid pressurization device suitable for the airtight test of the LNG gas cylinder for vehicles.
In order to solve the above problems, the present utility model provides an LNG cylinder pressurizing device, which is designed to realize rapid pressurization of an LNG cylinder, and fig. 1 to 4 are schematic structural diagrams of an embodiment of the LNG cylinder pressurizing device according to the present utility model.
Referring to fig. 1 to 2, the present utility model proposes an LNG cylinder pressurizing device 1000, a vaporizing pressurizing flow path 1 is formed on the LNG cylinder pressurizing device 1000, the vaporizing pressurizing flow path 1 is used to communicate a liquid outlet and an air inlet of an LNG cylinder to be pressurized, the vaporizing pressurizing flow path 1 is sequentially provided with a vaporizing device 2 and a pressurizing pump 3, the LNG liquid flows out from the liquid outlet to the vaporizing device 2 through the vaporizing pressurizing flow path 1, the LNG liquid is vaporized into gaseous natural gas by the vaporizing device 2 and flows out from the vaporizing device 2, the pressurizing pump 3 pressurizes the low-pressure natural gas through the vaporizing pressurizing flow path 1 to the pressurizing pump 3, the pressurizing pump 3 is operated to pump and then discharge the natural gas at an inlet of the pressurizing pump 3, one side of the pressurizing pump 3 is low-pressure and the other side of the pressurizing pump 3 is high-pressure, the formed pressure difference enables the LNG liquid to flow out from the liquid outlet and enter the vaporizing device 2, and the volume of the natural gas is 625 times of the volume of the natural gas under the atmospheric pressure, and thus the LNG liquid can be quickly pressurized by the pressurizing effect of the LNG cylinder to be pressurized when the LNG cylinder is pressurized by the vaporizing pressurizing flow path 1.
In some embodiments, the pipes used to connect the devices in the vaporizing and pressurizing flow path 1 may be metal pipes, plastic pipes, or pipes made of other materials. The metal pipe has a longer life and excellent impact resistance, friction resistance and pressure resistance, and in the vaporizing and pressurizing passage 1, the connecting pipe needs to withstand LNG liquid at an ultra-low temperature and also natural gas pressurized by the pressurizing pump 3, so that the connecting pipe needs to have excellent pressure resistance and impact resistance.
In addition, the vaporizing and pressurizing flow path 1 is further provided with a buffer device 4, the buffer device 4 is arranged between the vaporizing device 2 and the pressurizing pump 3 and is used for buffering the vaporized natural gas, the buffer device 4 can play a role in buffering and stabilizing flow, and in addition, the buffer device 4 can also prevent pressure surge caused by rapid volume expansion after vaporization of the liquefied natural gas, so that liquid or gas is caused to flow back. Because the pressure of the natural gas can greatly fluctuate in the whole LNG cylinder pressurizing device 1000, the buffer device 4 can temporarily store the gas, alleviate the interference of vibration of the pipeline on the device, and stabilize the pressure of the vaporizing and pressurizing flow path 1, protect the vaporizing and pressurizing flow path 1 from the impact caused by the pressure fluctuation, and then, convey the buffered natural gas to the pressurizing pump 3 through the vaporizing and pressurizing flow path 1.
Referring to fig. 3, the buffer device 4 is configured as a buffer tank 41, the buffer tank 41 is configured as a small buffer tank 41, the buffer tank 41 may be made of a pressure-resistant material such as stainless steel, the capacity of the small buffer tank 41 may be set to 1L, and the buffer tank is convenient to detach and carry, and in addition, the maximum pressure that the small buffer tank 41 can bear is 4MPa. The buffer tank 41 is provided with the air pressure monitoring mechanism 5 and the pressure relief structure 6, the air pressure monitoring mechanism 5 can be set to be a positive pressure gauge and a negative pressure gauge, the positive pressure gauge and the negative pressure gauge can display positive pressure and negative pressure, the display range of the positive pressure gauge and the negative pressure gauge is-100 KPa to 4MPa, the positive pressure gauge and the negative pressure gauge arranged on the buffer tank 41 can play a role in monitoring the air pressure in the buffer tank 41 in real time, the influence of the air pressure in the buffer tank 41 or the air pressure is too low to the LNG gas cylinder supercharging device 1000 is avoided, in addition, the pressure relief structure 6 is provided with an emptying valve, when the LNG gas cylinder supercharging device 1000 is used each time, the emptying valve is required to be opened firstly to empty the LNG gas cylinder supercharging device 1000, air in the device is emptied, and explosive mixed gas is prevented from forming inside the vaporization supercharging flow path 1, so that the safety of the LNG gas cylinder supercharging device 1000 is stronger.
In addition, the vaporization pressurizing flow path 1 is further provided with an air pressure monitoring mechanism 5 and/or a pressure relief structure 6, the air pressure monitoring mechanism 5 and/or the pressure relief structure 6 are located between the pressurizing pump 3 and the air cylinder to be pressurized, the air pressure monitoring mechanism 5 can be set to be a positive pressure gauge and a negative pressure gauge, the positive pressure gauge and the negative pressure gauge can display positive pressure and negative pressure, the display range of the positive pressure gauge and the negative pressure gauge is-100 KPa to 4MPa, the positive pressure gauge and the negative pressure gauge arranged on the air outlet of the pressurizing pump 3 can play a role in monitoring the air pressure of the pressurized natural gas in real time, in addition, the pressure relief structure 6 is provided with an emptying valve, when the LNG air cylinder pressurizing device 1000 is used each time, the emptying valve needs to be opened first to empty the LNG air cylinder pressurizing device 1000, air inside the device is emptied, and explosive mixed gas formed inside the vaporization pressurizing flow path 1 is prevented, and the safety of the LNG air cylinder pressurizing device 1000 is stronger.
Meanwhile, before each use, the positive and negative pressure gauges can also monitor whether leakage exists in the vaporizing and pressurizing flow path 1, and the positive and negative pressure gauges specifically operate to ensure that after the vaporizing and pressurizing flow path 1 is connected, as the vaporizing and pressurizing flow path 1 is further provided with the one-way stop valves 8, the number of the one-way stop valves 8 is multiple, one-way stop valve 8 is positioned between the gas cylinder to be pressurized and the vaporizing device 2, the other one-way stop valve 8 is positioned between the vaporizing device 2 and the pressurizing pump 3, the one-way stop valve 8 arranged between the gas cylinder to be pressurized and the vaporizing device 2 is firstly closed, the pressurizing pump 3 is started, the pressurizing pump 3 is enabled to operate to suck, the inlet pipeline of the pressurizing pump 3 is enabled to be in a negative pressure high vacuum state, at the moment, the pressurizing pump 3 is closed, whether the negative pressure of the positive and negative pressure gauges is kept stable or not is observed, if the numerical value shows stable, the sealing performance of the vaporizing and pressurizing flow path 1 is good, at the moment, the LNG gas cylinder pressurizing device 1000 can normally operate.
After LNG gas cylinder supercharging device 1000 finishes the operation, need be right vaporization supercharging flow path 1 is dismantled, but the pipeline is kept there is the natural gas of higher pressure at this moment, and dismantles comparatively dangerous this moment, and behind the booster pump 3 shut down, pipeline inside gas does not circulate, consequently can through buffer tank 41 and the exhaust valve that is equipped with on the booster pump 3 export carries out the pressure release evacuation, when seeing positive and negative manometer and show to be 0, indicates that the pressure release finishes, carries out the dismantlement to LNG gas cylinder supercharging device 1000 this moment again, can guarantee the safety when dismantling better.
Further, referring to fig. 4, the booster pump 3 includes: a pump body 31, wherein a cavity, a pump coaxial piston 32 and a driving part 33 are formed in the pump body 31, the cavity is used for compressing the inflow natural gas, and the compressed natural gas flows out through the vaporization pressurizing flow path 1; the pump coaxial piston 32 is arranged along the inside of the pump body 31, and the pump coaxial piston 32 reciprocates along the cavity to compress natural gas; and, the driving part 33 can drive the pump coaxial piston 32 to reciprocate; more specifically, two first chambers 311 and a second chamber 312 that are mutually communicated are formed in the pump body 31, the outlet of the buffer tank 41 is connected to the first chambers 311, when the booster pump 3 operates, after natural gas enters the first chambers 311, the driving part 33 drives the pump coaxial piston 32 to compress the natural gas, the natural gas is input into the second chambers 312 through the internal working pipeline 34 of the booster pump 3, and is discharged after being pressurized again in the second chambers 312, so that a low pressure at the inlet of the booster pump 3 and a high pressure at the outlet of the booster pump 3 are formed, and due to the pressure difference, the LNG liquid inside the LNG gas cylinder 10 can flow out from the liquid outlet, so that a subsequent vaporization pressurization step is performed. The booster pump 3 adopts an unbalanced gas distribution valve to realize reciprocating motion of the pump, so that natural gas is discharged after bipolar pressurization and enters the LNG cylinder 10, and the natural gas circularly flows in such a way, so that LNG liquid can be quickly changed into natural gas and returned into the gas cylinder, and the pressure in the LNG cylinder 10 is quickly improved.
Meanwhile, a safety relief valve is further arranged at the outlet of the booster pump 3. Because the internal pressure of the booster pump 3 may be too high during normal operation, and such high pressure is not needed in the LNG cylinder, or the one-way valve in the vaporization booster flow path 1 is closed by mistake, when the outlet of the booster pump 3 is over-pressurized and reaches the rated pressure of the safety relief valve, the safety relief valve is automatically opened at this time, the safety relief pressure is avoided, the occurrence of accidents is avoided, and the safety of the whole device is improved.
In some embodiments, the vaporizing and pressurizing flow path 1 is further provided with a plurality of spring check valves 7, one spring check valve 7 is located between the buffer device 4 and the pressurizing pump 3, the other spring check valve 7 is located between the pressurizing pump 3 and the gas cylinder to be pressurized, the spring check valve 7 is of a unidirectional structure, and only gas can flow forward, so that gas backflow can be prevented, and in particular, some spring check valves 7 are arranged on the working pipeline 34 inside the pressurizing pump 3, so that the high-pressure natural gas is prevented from flowing back into the first chamber 311 from the second chamber 312, and the pressurizing pump 3 cannot work and run.
In some embodiments, the driving portion 33 is configured as a gas driving portion 33, specifically, the gas of the gas driving portion 33 may be compressed air or other compressed inert gas, and the compressed air may be used as a driving gas source to achieve the effects of environmental protection and low cost, and meanwhile, the compressed air may be used at any time, so that the gas driving portion 33 can operate in various environments. The gas driving part 33 further comprises a driving gas source working cavity, which is also called an air circulation valve device, the driving gas source working cavity is provided with a driving gas source air inlet and a driving gas source air outlet, compressed air enters the driving gas source working cavity from the driving gas source air inlet and provides power for the pump coaxial piston 32 to reciprocate, the compressed air is discharged from the driving gas source air outlet after acting, and an exhaust muffler is further arranged at the driving gas source air outlet to avoid too much noise when the gas driving part 33 works. In addition, the gas driving part 33 further includes a driving gas source control component 3312, the driving gas source control component 3312 is disposed on the driving gas source gas path 3311, further, the driving gas source control component 3312 is disposed at the driving gas source gas inlet, the driving gas source control component 3312 includes a pressure regulating valve, a gas pressure monitoring mechanism 5 and a switch valve, the pressure regulating valve, the gas pressure monitoring mechanism 5 and the switch valve are disposed in series, and the gas source sequentially passes through the pressure regulating valve, the gas pressure monitoring mechanism 5 and the switch valve.
In some embodiments, the vaporizing device 2 includes a vaporizer, the vaporizer is configured as a room temperature vaporizer, and is mainly made of aluminum alloy, and has a weight of about 15KG, so that it can be light, a maximum pressure that it can withstand is 4MPa, and a maximum flow rate is 300L/min, when the booster pump 3 is operated, the LNG liquid flows out from the liquid outlet, enters into the bottom of the vaporizer, exchanges heat with the external air through the base pipe fins, absorbs heat for vaporization, and the gaseous natural gas flows out from the top of the vaporizer, and enters into the buffer tank 41 through the vaporization pressurization flow path 1.
Referring to fig. 3 again, the LNG cylinder pressurizing device 1000 further includes a moving assembly 9, the moving assembly 9 includes a supporting portion 91 and a moving portion 92, the number of the moving assemblies 9 is set to 2, the vaporizing device 2 is disposed on the supporting portion 91 of one of the moving assemblies 9, the pressurizing pump 3 is mounted on the supporting portion 91 of the other moving assembly 9, the moving assemblies 9 are detachably connected through a connecting structure 93, the moving assembly 9 can be set to be a trolley with universal wheels, the trolley is provided with four universal wheels, the universal wheels are provided with lockable switches for fixing the trolley, the connecting structure 93 can be set to be a coupling hook, and the two trolleys are connected and separated through the coupling hook. The trolley is square, the edges of the trolley are formed by welding pipelines, two steel plates are welded at the bottom of the trolley, the trolley is hollow and erected, and each device is arranged on the steel plate at the bottom. One of the trolleys is provided with a vaporization device 2, the other trolley is provided with a buffer device 4 and a booster pump 3, and vaporization and booster flow paths 1 are communicated with each other. The LNG gas cylinder supercharging device 1000 in the technical scheme has a simple structure, can be separated into two trolleys to move respectively, can also move together by connecting hooks in series, has the weight of the trolleys with the carburettor not exceeding 15KG, has the weight of the trolleys with the supercharging pump 3 not exceeding 16KG, has the length of 800MM, the width of 450MM and the height of 600MM, has moderate integral size, has convenient action, can be placed in a rear trunk of a sedan for transportation, is portable for carrying after reaching a test site, and locks the two trolleys in series by connecting the hooks during installation operation, locks four wheels of the trolleys and is fixed on the ground; the LNG cylinder 10 for the vehicle is connected with the device through threads by using a metal pipe and a special connector; after the test is finished, the natural gas in the vaporization pressurizing flow path 1 is depressurized, the metal pipe is removed, the LNG gas cylinder joint is restored, and the trolley can be moved at will after four wheels are unlocked. And further, the light weight is realized, the device is convenient and fast, movable, and the assembly and disassembly are simple.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (10)
1. The LNG gas cylinder pressurizing device is characterized in that a vaporization pressurizing flow path is formed on the LNG gas cylinder pressurizing device and is respectively used for communicating a liquid outlet and a gas inlet of a gas cylinder to be pressurized;
the vaporizing and pressurizing flow path is sequentially provided with a vaporizing device and a pressurizing pump, and the vaporizing device is used for vaporizing natural gas liquid flowing out from a liquid outlet of the gas cylinder to be pressurized;
the booster pump is used for sucking the liquid outlet of the gas cylinder to form negative pressure, and is used for pressurizing the gasified natural gas and then sending the gasified natural gas into the gas inlet of the gas cylinder to be pressurized.
2. The LNG bottle pressurization device of claim 1, wherein the vaporization pressurization flow path is further provided with a buffer device, the buffer device being disposed between the vaporization device and the booster pump for buffering the vaporized natural gas.
3. The LNG cylinder pressurization device of claim 2, wherein the buffer device is configured as a buffer tank, and the buffer tank is provided with a positive and negative pressure monitoring mechanism and a pressure relief structure.
4. The LNG cylinder pressurization device of claim 2, wherein the booster pump comprises:
the pump body is internally provided with a cavity for compressing the inflow natural gas, and the compressed natural gas flows out through the vaporization pressurizing flow path;
the pump coaxial piston is arranged along the inside of the pump body, and reciprocates along the cavity to suck and compress natural gas by the small piston; the method comprises the steps of,
and the driving part comprises a large piston and is used for driving the pump coaxial piston to reciprocate.
5. The LNG cylinder pressure boosting apparatus according to claim 4, wherein the driving unit is configured as a gas driving unit, the gas driving unit further comprises a driving gas source control assembly, the driving gas source control assembly is disposed on a driving gas source gas path, the driving gas source control assembly includes a pressure regulating valve, a gas pressure monitoring mechanism, and a switching valve, the pressure regulating valve, the gas pressure monitoring mechanism, and the switching valve are connected in series, and a gas source sequentially passes through the pressure regulating valve, the gas pressure monitoring mechanism, and the switching valve.
6. The LNG cylinder pressurizing device as in claim 4, wherein the vaporization pressurizing flow path is further provided with a plurality of spring check valves, one between the buffering device and the pressurizing pump and the other between the pressurizing pump and the cylinder to be pressurized.
7. The LNG cylinder pressurizing device as in claim 1, wherein the vaporization pressurizing flow path is further provided with an air pressure monitoring mechanism and/or a pressure relief structure, the air pressure monitoring mechanism and/or the pressure relief structure being located between the pressurizing pump and the cylinder to be pressurized.
8. The LNG cylinder pressurization device of claim 1, wherein the vaporization device comprises a vaporizer configured as a room temperature vaporizer.
9. The LNG cylinder pressurizing device as in claim 1, wherein said vaporization pressurizing flow path is further provided with one-way stop valves, said one-way stop valves being provided in a plurality, one of said one-way stop valves being located between said cylinder to be pressurized and said vaporization device, and the other one of said one-way stop valves being located between said vaporization device and said booster pump.
10. The LNG cylinder pressurizing device as in claim 1, further comprising a moving assembly comprising a support portion and a moving portion, the number of moving assemblies being set to 2, the vaporizing device being disposed on the support portion of one of the moving assemblies, the pressurizing pump being mounted on the support portion of the other moving assembly, the moving assemblies being detachably connected by a connecting structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322112064.8U CN220551780U (en) | 2023-08-07 | 2023-08-07 | LNG gas cylinder supercharging device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322112064.8U CN220551780U (en) | 2023-08-07 | 2023-08-07 | LNG gas cylinder supercharging device |
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| CN202322112064.8U Active CN220551780U (en) | 2023-08-07 | 2023-08-07 | LNG gas cylinder supercharging device |
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