CN110017222B - Vehicle and natural gas supply system thereof - Google Patents
Vehicle and natural gas supply system thereof Download PDFInfo
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- CN110017222B CN110017222B CN201810021083.0A CN201810021083A CN110017222B CN 110017222 B CN110017222 B CN 110017222B CN 201810021083 A CN201810021083 A CN 201810021083A CN 110017222 B CN110017222 B CN 110017222B
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- supply system
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 239000003345 natural gas Substances 0.000 title claims abstract description 78
- 239000007789 gas Substances 0.000 claims abstract description 150
- 239000006200 vaporizer Substances 0.000 claims abstract description 44
- 239000012071 phase Substances 0.000 claims abstract description 28
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 15
- 239000007791 liquid phase Substances 0.000 claims abstract description 9
- 230000003139 buffering effect Effects 0.000 claims abstract description 3
- 239000000498 cooling water Substances 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 17
- 238000009434 installation Methods 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 5
- 238000009834 vaporization Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007792 gaseous phase Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/029—Arrangement on engines or vehicle bodies; Conversion to gaseous fuel supply systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/06—Apparatus for de-liquefying, e.g. by heating
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a vehicle and a natural gas supply system thereof, wherein the natural gas supply system comprises: gas cylinder, vaporizer and buffer tank. The gas cylinder is horizontally arranged and is used for storing liquefied natural gas; the vaporizer is provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the vaporizer is capable of receiving liquid phase natural gas delivered by the gas cylinder and gasifying the liquid phase natural gas into gas phase natural gas; the buffer tank is arranged at intervals with the vaporizer along the longitudinal direction of the gas cylinder, and is also provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the buffer tank is used for storing and buffering the gas-phase natural gas gasified by the carburetor and supplying the gas-phase natural gas to an engine of a vehicle. According to the natural gas supply system for the vehicle, the vaporizer and the buffer tank are used as the mounting support of the gas cylinder, so that the cost is reduced, the mounting space is saved, and the gas supply system is more compact.
Description
Technical Field
The invention relates to a natural gas supply system, in particular to a vehicle and the natural gas supply system thereof.
Background
With the increasing severity of world environmental problems, the global strength of environmental supervision is gradually deepened and encourages the use of clean new energy, multiple countries have announced that fuel automobiles are stopped for 2025 years to popularize and use clean new energy vehicles, natural gas is used as one of the clean new energy, shale gas and combustible ice exploitation technologies are maturing day by day, the yield of the shale gas and the combustible ice exploitation technologies is rapidly increased, and the use of the natural gas has wide long-term development prospect.
At present, lng has been widely used as fuel in facilities such as buses, engineering vehicles, ships, etc., but for some facilities with limited installation space, or facilities requiring space saving for the purpose of multi-loading lng, and cars (taxis and cars) which may use lng as fuel in the future, there is an urgent need for a gas supply system which saves space and can load lng fuel as much as possible to solve the installation space problem.
Disclosure of Invention
In order to solve the technical problems, the invention provides a vehicle and a natural gas supply system thereof, which are used for solving the problems that the natural gas supply system in the prior art has a plurality of parts, all parts in the system are independently installed, and particularly, a carburetor and a buffer tank are taken as independent parts to occupy larger space of the vehicle, so that the structure of the gas supply system is not compact and the like.
In order to solve the above technical problems, the present invention provides a natural gas supply system for a vehicle, which includes: gas cylinder, vaporizer and buffer tank. The gas cylinder is horizontally arranged and is used for storing liquefied natural gas; the vaporizer is provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the vaporizer is capable of receiving liquid phase natural gas delivered by the gas cylinder and gasifying the liquid phase natural gas into gas phase natural gas; the buffer tank is arranged at intervals with the vaporizer along the longitudinal direction of the gas cylinder, and is also provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the buffer tank is used for storing and buffering the gas-phase natural gas gasified by the carburetor and supplying the gas-phase natural gas to an engine of a vehicle.
In a preferred scheme, the vaporizer is communicated with the buffer tank through a first pipeline, and a check valve which is communicated with the buffer tank in one way is arranged on the first pipeline; the natural gas supply system further comprises: a second pipeline; the inlet end of the second pipeline is connected with the first pipeline, and the connection position is positioned between the check valve and the carburetor; the outlet end of the second pipeline is connected with the gas phase space of the gas cylinder so as to convey the gas phase natural gas gasified by the vaporizer back into the gas cylinder to pressurize the gas cylinder.
In a preferred scheme, a pressurizing opening valve is arranged on the second pipeline so as to control the on-off of the second pipeline.
In a preferred scheme, the second pipeline is communicated with the first pipeline through a connector, and a pressure stabilizing valve is arranged between the connector and the vaporizer on the first pipeline.
In a preferred embodiment, the vaporizer and the surge tank each have a closed interior formed by a housing comprising: the gas cylinder comprises a bottom plate, a plurality of side plates extending upwards from each side of the bottom plate, and a top plate connected with the top edge of each side plate, wherein the top plate is a concave arc plate which is matched with the bottom of the gas cylinder, so that a supporting surface for supporting the gas cylinder is formed.
In a preferred scheme, a heat exchange coil is arranged in the inner cavity of the shell of the carburetor; the inlet end of the heat exchange coil is communicated with the gas cylinder, and the outlet end of the heat exchange coil is communicated with the buffer tank; the shell is provided with a cooling water inlet and a cooling water outlet which are communicated with the inner cavity of the shell, and the cooling water inlet and the cooling water outlet are connected with an engine cooling water system.
In a preferred scheme, the heat exchange coil comprises two groups which are communicated with each other, and the two groups of heat exchange coils are respectively and correspondingly arranged at two sides of the width direction of the gas cylinder.
In a preferred scheme, the supporting surface is connected with the bottom of the gas cylinder through a heat-insulating backing plate; the heat-insulating base plate comprises two outer layers and an inner layer positioned between the two outer layers, wherein the inner layer is composed of a plurality of layers of aluminum foils and glass fiber papers, and the outer layer is composed of rubber; the two outer layers are respectively contacted with the bottom of the gas cylinder and the top plate.
In a preferred scheme, the gas cylinder comprises a gas cylinder body and a retainer which extends outwards along one longitudinal end of the gas cylinder body, the gas cylinder body is of a closed cylindrical structure, and the retainer is positioned in the range of the transverse section of the gas cylinder body; the natural gas supply system further comprises: and the filling assembly is arranged on the protective ring so as to fill the liquefied natural gas into the gas cylinder body.
The present invention also provides a vehicle, comprising: the vehicle body and the natural gas supply system connected with the vehicle body are used for supplying gas to an engine of the vehicle.
Compared with the prior art, the invention has the following beneficial effects: according to the natural gas supply system for the vehicle, the vaporizer and the buffer tank are used as the mounting support of the gas cylinder, so that the cost is reduced, the mounting space is saved, and the gas supply system is more compact.
Drawings
Fig. 1 is a schematic diagram of the natural gas supply system of the present embodiment.
Fig. 2 is a schematic view of the structure of one end of the natural gas supply system in the longitudinal direction of the present embodiment.
Fig. 3 is a schematic view of the structure of the carburetor of the present embodiment.
Fig. 4 is a schematic side view of the carburetor of the present embodiment.
Fig. 5 is a schematic top view of the carburetor of the present embodiment.
Fig. 6 is a schematic view of the internal structure of the carburetor of the present embodiment.
Fig. 7 is a schematic view of the internal structure of the carburetor of the present embodiment at another angle.
Fig. 8 is a schematic structural view of the surge tank of the present embodiment.
Fig. 9 is a schematic top view of the surge tank of the present embodiment.
Fig. 10 is a flow chart of the natural gas supply system of the present embodiment.
The reference numerals are explained as follows: 2. a gas cylinder; 21. a cylinder; 22. a seal head; 23. a retainer; 31. a vaporizer; 32. a buffer tank; 301. a bottom plate; 302. a side plate; 303. a top plate; 305. a fixing plate; 33. a heat insulating backing plate; 311a, heat exchange coil; 311b, heat exchange coil; 3111. an inlet end; 3112. an outlet end; 313. a cooling water inlet; 314. a cooling water outlet; 41. a pipeline; 42. a pipeline; 43. a pipeline; 401. a joint; 5. a check valve; 6. a pressure stabilizing valve; 7. a buffer tank pressure gauge; 8. a pressurizing opening valve; 91. a liquid adding tube; 92. a liquid inlet valve; 93. a liquid adding interface; 94. a gas cylinder pressure gauge; 95. filling an arc plate; 96. an air return pipe; 97. an air return port; 10. an economic valve; 11. a blow-off valve; 121. a main safety valve; 122. an auxiliary safety valve; 14. an angle stop valve; 15. a liquid level gauge; 16. a liquid outlet one-way valve; 17. a liquid outlet valve; 18. an overflow valve; 19. and (5) pulling the belt.
Detailed Description
Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It will be understood that the invention is capable of various modifications in various embodiments, all without departing from the scope of the invention, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the invention.
Referring to fig. 1 to 10, a vehicle provided in this embodiment includes: the vehicle comprises a vehicle body and a natural gas supply system connected with the vehicle body, wherein the natural gas supply system is used for supplying gas to an engine of the vehicle. Further, the natural gas supply system includes: a gas cylinder 2, a vaporizer 31, and a buffer tank 32.
The gas cylinder 2 is arranged horizontally and is used for storing liquefied natural gas. The carburetor 31 has a support surface for supporting the gas cylinder 2 and a bottom surface for connection with the vehicle body; vaporizer 31 is capable of receiving liquid phase natural gas delivered by gas cylinder 2 and performing a gasification to gas phase natural gas. The buffer tank 32 is arranged at intervals from the vaporizer 31 along the longitudinal direction of the gas cylinder 2, and the buffer tank 32 also has a supporting surface for supporting the gas cylinder 2 and a bottom surface for connecting with a vehicle body; the buffer tank 32 is used to store and buffer the gas phase natural gas gasified by the carburetor 31 and supply the gas phase natural gas to the engine of the vehicle.
According to the natural gas supply system for the vehicle, the vaporizer 31 and the buffer tank 32 are used as the mounting support of the gas cylinder 2, so that the cost is reduced, the mounting space is saved, and the gas supply system is more compact.
Further, referring to fig. 1, the natural gas supply system of the present embodiment further includes: line 41, line 42 and line 43.
The vaporizer 31 is connected with the gas cylinder 2 through a pipeline 41; vaporizer 31 communicates with surge tank 32 via line 42; the inlet end of the pipe 43 is connected to the pipe 42 through a joint 401, and the outlet end thereof is communicated with the gas phase space of the gas cylinder 2. Wherein, the pipeline 42 is provided with a check valve 5, a pressure stabilizing valve 6 and a buffer tank pressure gauge 7; the check valve 5 is in one-way conduction to the buffer tank 32, and is positioned between the joint 401 and the buffer tank 32; the pressure stabilizing valve 6 and the buffer tank pressure gauge 7 are positioned between the vaporizer 31 and the joint 401, and the pressure stabilizing valve 6 is used for controlling the gas flow and keeping the pressure of the pipeline gas phase natural gas; the buffer vessel pressure gauge 7 is used to monitor the pressure index within the buffer vessel 32. The pipeline 43 is provided with a pressurizing opening valve 8 (belonging to the class of stop valves) for controlling the on-off of the pipeline 43.
The pressurizing opening valve 8 is in a normally closed state, and at this time, the gas phase natural gas gasified by the gasifier 31 can be conveyed into the buffer tank 32 through the pipeline 42; when the gas cylinder 2 needs to be pressurized, the pressurizing opening valve 8 is opened to convey the gas phase natural gas gasified by the vaporizer 31 back into the gas cylinder 2 through the pipeline 43 to pressurize the gas cylinder 2. The mode to the pressure boost of gas cylinder 2 that this embodiment adopted has improved the air feed flow, has saved the setting of the pressure boost pipeline in gas cylinder 2, and current empty temperature formula finned tube booster and pressure boost governing valve, has reduced the heat of passing into in the gas cylinder 2 by the pipeline, and gas cylinder 2 heat preservation effect is better, greatly reduced static evaporation rate, has indirectly reduced the waste of natural gas evacuation.
Referring to fig. 3 to 7, the vaporizer 31 of the present embodiment is a water-bath vaporizer, two groups of heat exchanging coils 311a and 311b which are mutually communicated are disposed in a housing of the vaporizer 31, and the two groups of heat exchanging coils 311a and 311b are respectively disposed at two sides of the gas cylinder 2 in the width direction and are both fixed by a fixing plate 305. The inlet end 3111 of the heat exchange coil 311a is connected to the pipe 41 so as to communicate with the gas cylinder 2; the outlet end 3112 of heat exchange coil 311b is connected to conduit 42 for communication with buffer tank 32. The housing of the carburetor 31 is provided with a cooling water inlet 313 and a cooling water outlet 314 communicating with the housing inner chamber, wherein the cooling water inlet 313 and the outlet 3112 are located on one side in the width direction of the gas cylinder 2, and the cooling water outlet 314 and the inlet 3111 are located on the other side in the width direction of the gas cylinder 2.
Liquefied natural gas in the gas cylinder 2 is sent from the inlet 3111 to the heat exchange coils 311a and 311b, is gasified after heat exchange with cooling water in the shell side, and is sent from the outlet 3112, thereby completing heat exchange. Specifically, the shell side medium of the vaporizer 31 is engine cooling water, the inlet temperature is 90-110 ℃, the outlet temperature is 50-80 ℃, and the temperature of the engine cooling water can be reduced while vaporizing the liquid phase natural gas, so that the cooling water is reused; the heat exchange coils 311a and 311b form a tube pass, the tube pass medium is liquefied natural gas, the lowest inlet temperature is-162 ℃, the outlet temperature is 30-40 ℃, and the vaporizer 31 is made of S30508 stainless steel plates and tubes, so that the normal use of the temperature can be satisfied.
The vaporizer 31 of the present embodiment may be a parallel flow type heat exchanger or a counter flow type heat exchanger, and the tube arrangement, the coil specification, the joint position, etc. are all determined according to the specific vehicle model, the vaporization amount, and the installation space.
Specifically, the vaporizer 31 and the buffer tank 32 of the present embodiment each have a closed inner cavity constituted by a housing in which the heat exchanging coils 311a, 311b are disposed. The housing of the present embodiment includes: a bottom panel 301, four side panels 302 and a top panel 303, see fig. 3 and 8. The bottom plate 301 is a rectangular plate and is connected with the vehicle body through bolts; the four side plates 302 are arranged to extend upwards along the four sides of the bottom plate 301, wherein the two side plates 302 along the width direction of the gas cylinder 2 are webs; the top plate 303 is a concave arc plate, and the top plate 303 is fixedly connected with the top edges of the four side plates 302, wherein the top plate 303 is matched with the bottom of the gas cylinder 2 so as to form a supporting surface for supporting the gas cylinder 2. Preferably, a heat-insulating pad 33 is further arranged on the supporting surfaces of the vaporizer 31 and the buffer tank 32, the heat-insulating pad 33 comprises two outer layers and an inner layer positioned between the two outer layers, the inner layer is composed of a plurality of layers of aluminum foils and glass fiber paper, the outer layer is composed of rubber, the two outer layers are respectively contacted with the bottom and the top plate 303 of the gas cylinder 2, and the heat-insulating pad plays a role in isolating and reducing the heat transfer of cooling water in the vaporizer 31 to the gas cylinder 2 and increasing the friction force between the cooling water and the gas cylinder 2.
In practical use, the setting of the heat exchange coil is not limited to two groups in this embodiment, and the tube diameter and the shape of the heat exchange coil are determined according to the inner cavity space of the vaporizer and the required vaporization amount.
Referring again to fig. 1 and 2, the cylinder 2 comprises: a cylinder body and a retainer 23 for protecting the cylinder valve. The gas cylinder body is a closed structure formed by a cylinder body 21 and sealing heads 22 positioned at two longitudinal ends of the cylinder body 21, and is used for containing liquid-phase natural gas; the retainer 23 is connected with one of the sealing heads 22, the retainer 23 extends along the longitudinal direction of the gas cylinder body and away from the gas cylinder body, and the retainer 23 is arranged along the circumferential direction of the gas cylinder body and is arranged in the range of the transverse section of the gas cylinder body. The valve pipeline components of the natural gas supply system are mostly installed at the retainer 23 in a centralized way, so that the valve pipeline components are located within the installation outline of the gas cylinder 2, high integration is realized, and the space of the gas supply system is reduced.
Further, a filling assembly is provided at the retainer 23 to fill the gas cylinder body with liquid natural gas. The filling assembly includes: a liquid feeding interface 93, a return air port 97, a gas cylinder pressure gauge 94 and a filling arc plate 95; wherein the liquid feeding interface 93 is welded on the guard ring 23 through a filling arc plate 95; at the same time, cylinder pressure gauge 94 is also welded to retainer 23 by a filler arc plate 95. The liquid adding interface 93 is connected to the outer end of the liquid adding pipe 91, and the inner end of the liquid adding pipe 91 is communicated with the inside of the gas cylinder body through the liquid inlet valve 92, so that the gas filling station can add liquid to the gas cylinder body; the return air port 97 is arranged at one end of the return air pipe 96, while the other end of the return air pipe 96 is communicated with the inner gas phase of the gas cylinder body through the air release valve 11, if the pressure of the gas cylinder body is too high during liquid adding, the gas in the gas cylinder body is released to the BOG loop of the natural gas filling station through the return air passage, so that the effect of reducing the pressure of the gas cylinder body to quickly add liquid is achieved.
In addition, the economizer valve 10, the blow-off valve 11, the main relief valve 121, the sub-relief valve 122, the angle shut-off valve 14, the level gauge 15, the liquid outlet check valve 16, the liquid outlet valve 17, and the overflow valve 18 are provided in the mounting range of the retainer 23. The economic valve 10 can control the system to preferentially use gas-phase natural gas naturally gasified in the gas cylinder body, so that the pressure in the gas cylinder body is reduced, and the waste of fuel caused by emptying is avoided. The gas phase natural gas in the gas cylinder body is discharged through the vent valve 11 to reduce the pressure in the non-working or emergency state, so that accidents are avoided.
In this embodiment, the outlet end of the pipe 41 is connected to the head 22 within the installation range of the retainer 23, and the inlet end thereof is connected to an outer web of the carburetor 31; the pipeline 42 is connected between the vaporizer 31 and the shell of the buffer tank 32 and is respectively connected with the webs opposite to the vaporizer 31 and the buffer tank 32; the outlet end of the pipe 43 is connected to the pipe 42, and the inlet end thereof extends along one side of the cylinder 2 into the installation range of the retainer 23 and is connected to the head 22 within the installation range of the retainer 23, so that the pipes 41, 42, 43 are located within the installation contour spaces of the cylinder 2 and the support. Meanwhile, all valve components in the natural gas supply system of the embodiment are arranged on the gas cylinder 2, and are highly integrated in the installation outline space of the gas cylinder 2, so that the installation space is greatly saved, and the whole gas supply system is more simplified and attractive.
The natural gas supply system of this embodiment further includes: two pull straps 19 wound on the upper part of the gas cylinder 2, wherein the two pull straps 19 are longitudinally and alternately distributed along the gas cylinder 2 and are respectively connected with the shells of the vaporizer 31 and the buffer tank 32 in a matched manner so as to pinch the gas cylinder 2 to prevent the gas cylinder from moving in all directions in space; preferably, the pull strap 19 is made of stainless steel, and a rubber pad is arranged between the pull strap and the gas cylinder body to play a role in increasing friction force between the pull strap and the gas cylinder body.
In practical use, the piping mode, the coil specification and the joint position of the natural gas supply system are not limited to those of the present embodiment, and may be determined according to specific situations.
Referring to fig. 10, the natural gas supply system of this embodiment has the following working principles: a line 43 is led out from the line 42 after the pressure stabilizing valve 6 and before the buffer tank 32 to connect the gas phase space of the gas cylinder 2 to form a loop, and the gas phase natural gas vaporized by the vaporizer 31 is introduced into the gas cylinder 2 to be pressurized. Meanwhile, in order to avoid insufficient air supply of the buffer tank 32 caused by the pressurization, a check valve 5 is arranged in front of the buffer tank 32 to prevent the gas phase natural gas from being returned into the gas cylinder 2 with lower pressure from the buffer tank 32. When the pressure of the gas cylinder 2 is smaller than the set pressure of the pressure stabilizing valve 6, the pressurizing opening valve 8 is opened, the gas phase natural gas returns to the gas cylinder 2 with low pressure, and the pressure of the gas cylinder 2 and the buffer tank 32 change along with the gas for vehicles (the buffer tank 32 supplies gas and the pressure of the gas cylinder 2 gradually increases), and then the gas phase natural gas enters into the low pressure part and alternately enters into the gas cylinder 2 or the buffer tank 32 to pressurize the gas cylinder 2 or supply gas for vehicles. The pressure regulating valve 6 is the back end control pressure regulating, namely when buffer tank 32 pressure is lower than pressure regulating valve 6 settlement pressure, gaseous phase natural gas gets into buffer tank 32 through pressure regulating valve 6, buffer tank 32 pressure is greater than pressure regulating valve 6 settlement pressure, pressure regulating valve 6 is closed, gaseous phase natural gas stops getting into buffer tank 32, pressure regulating valve 6 settlement pressure is higher, guarantee to have sufficient natural gas to get into buffer tank 32 through pressure regulating valve 6, buffer tank 32 has enough volume to store the natural gas of certain pressure, and vaporizer 31 heat transfer coil 311a, 311b has enough length, has sufficient vaporization ability, can guarantee that the natural gas of vaporization is sufficient, can satisfy gas cylinder 2 pressure boost and vehicle air feed simultaneously.
The invention realizes the high integration of the liquefied natural gas supply system for the vehicle, has fewer component valve pipelines, more simplified and attractive system, reduces labor, has lower cost of the gas supply system and has market competitiveness. And the automobile has more applicable automobile types and stronger universality, and is also prepared for the use of the car taking the liquefied natural gas as the fuel.
While the invention has been described with reference to the above exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (8)
1. A natural gas supply system for a vehicle, comprising:
the gas cylinder is horizontally arranged and is used for storing liquefied natural gas;
the carburetor is provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the vaporizer is capable of receiving liquid phase natural gas delivered by the gas cylinder and gasifying the liquid phase natural gas into gas phase natural gas;
the buffer tank is arranged at intervals with the vaporizer along the longitudinal direction of the gas cylinder and is also provided with a supporting surface for supporting the gas cylinder and a bottom surface for connecting with a vehicle body; the buffer tank is used for storing and buffering the gas-phase natural gas gasified by the carburetor and supplying the gas-phase natural gas to an engine of a vehicle, the carburetor is communicated with the buffer tank through a first pipeline, and a check valve which is communicated with the buffer tank in a one-way is arranged on the first pipeline;
the natural gas supply system further comprises: a second pipeline; the inlet end of the second pipeline is connected with the first pipeline, and the connection position is positioned between the check valve and the carburetor; the outlet end of the second pipeline is connected with the gas phase space of the gas cylinder so as to convey the gas phase natural gas gasified by the vaporizer back into the gas cylinder to pressurize the gas cylinder;
the vaporizer and the surge tank each have a closed interior chamber formed by a housing comprising: the gas cylinder comprises a bottom plate, a plurality of side plates extending upwards from each side of the bottom plate, and a top plate connected with the top edge of each side plate, wherein the top plate is a concave arc plate which is matched with the bottom of the gas cylinder, so that a supporting surface for supporting the gas cylinder is formed.
2. The natural gas supply system of claim 1, wherein a boost opening valve is provided on the second pipeline to control the on-off of the second pipeline.
3. The natural gas supply system of claim 1, wherein the second conduit communicates with the first conduit through a junction, and wherein the first conduit is provided with a pressure regulator valve between the junction and the vaporizer.
4. The natural gas supply system of claim 1, wherein the interior cavity of the housing of the vaporizer is provided with a heat exchange coil; the inlet end of the heat exchange coil is communicated with the gas cylinder, and the outlet end of the heat exchange coil is communicated with the buffer tank;
the shell is provided with a cooling water inlet and a cooling water outlet which are communicated with the inner cavity of the shell, and the cooling water inlet and the cooling water outlet are connected with an engine cooling water system.
5. A natural gas supply system as defined in claim 4, wherein said heat exchange coils comprise two groups of heat exchange coils connected to each other, said two groups of heat exchange coils being disposed on both sides of said gas cylinder in the width direction, respectively.
6. The natural gas supply system of claim 1, wherein the support surface is connected to the bottom of the cylinder by a thermally insulating backing plate; the heat-insulating base plate comprises two outer layers and an inner layer positioned between the two outer layers, wherein the inner layer is composed of a plurality of layers of aluminum foils and glass fiber papers, and the outer layer is composed of rubber; the two outer layers are respectively contacted with the bottom of the gas cylinder and the top plate.
7. The natural gas supply system of claim 1, wherein the gas cylinder comprises a cylinder body and a retainer extending outwardly along a longitudinal end of the cylinder body, the cylinder body being of a closed cylindrical configuration, the retainer being located within a transverse cross-section of the cylinder body;
the natural gas supply system further comprises: and the filling assembly is arranged on the protective ring so as to fill the liquefied natural gas into the gas cylinder body.
8. A vehicle, characterized by comprising: a vehicle body and a natural gas supply system as claimed in any one of claims 1 to 7 connected to the vehicle body for supplying gas to an engine of the vehicle.
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| CN201810021083.0A CN110017222B (en) | 2018-01-10 | 2018-01-10 | Vehicle and natural gas supply system thereof |
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| CN201810021083.0A CN110017222B (en) | 2018-01-10 | 2018-01-10 | Vehicle and natural gas supply system thereof |
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| CN110017222A CN110017222A (en) | 2019-07-16 |
| CN110017222B true CN110017222B (en) | 2024-02-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112810432B (en) * | 2021-01-11 | 2022-07-29 | 东风汽车股份有限公司 | Integrated fuel supply device of light LNG (liquefied Natural gas) commercial vehicle |
| CN114413165A (en) * | 2021-12-21 | 2022-04-29 | 江苏深绿新能源科技有限公司 | Small-volume welding heat-insulation gas cylinder device |
| CN115419826A (en) * | 2022-09-30 | 2022-12-02 | 东风汽车股份有限公司 | Gas supply system and car of car |
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| CN110017222A (en) | 2019-07-16 |
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