Dual-fuel automobile gas supply system

Abstract

The utility model discloses a dual-fuel automobile gas supply system, which relates to the technical field of automobile fuel supply and comprises a first fuel assembly, a first control valve, a second fuel assembly, a second control valve, a pipeline connecting piece and an engine assembly. An outlet of the first fuel assembly is sequentially connected with the first control valve, the pipeline connecting piece and the engine assembly to form a first gas supply pipeline, and an outlet of the second fuel assembly is sequentially connected with the second control valve, the pipeline connecting piece and the engine assembly to form a second gas supply pipeline. When the first control valve is switched on and the second control valve is switched off, the first fuel assembly supplies gas to the engine assembly, when the first control valve is switched off and the second control valve is switched on, the second fuel assembly supplies gas to the engine assembly, and two fuel gas supply modes are provided by controlling switching-on and switching-off of the first control valve and the second control valve; the gas vehicle can use two kinds of fuel energy at the same time, energy use types are enriched, and the energy utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile fuel supply, especially relates to a dual-fuel automobile gas supply system. BACKGROUND

[0002] CNG (compressed natural gas) is mainly used for short-distance vehicles and suburban community gas supply, and the common vehicle-mounted CNG is stored in high-strength storage tanks, and the storage pressure of natural gas is 20MPa; LNG (liquefied natural gas) is a low-temperature liquid fuel, which can be stored and transported at normal pressure, and the unit mass of liquefied natural gas is only half of that of gasoline, and the unit heat value is 12% higher than that of gasoline, so that the gas supply efficiency of the vehicle-mounted fuel system is improved, and the effective fuel carried is 2-3 times higher than that of the compressed gas tank type natural gas filling vehicle.

[0003] The prior art gas vehicle separately adopts a set of CNG gas supply system or a set of LNG gas supply system, but a kind of gas supply system can only use corresponding one kind of fuel energy, leading to single energy use type, and reducing energy utilization. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a dual-fuel automobile gas supply system to solve the technical problem that the prior art gas vehicle separately adopts a set of gas supply system to use only corresponding one kind of fuel energy, leading to single energy use type and reducing energy utilization.

[0005] The utility model embodiment provides a dual-fuel automobile gas supply system, comprising:

[0006] First fuel assembly, first control valve, second fuel assembly, second control valve, pipeline connecting piece, engine assembly;

[0007] The first fuel assembly outlet is sequentially connected with the first control valve, the pipeline connecting piece and the engine assembly and forms a first gas supply pipeline;

[0008] The second fuel assembly outlet is sequentially connected with the second control valve, the pipeline connecting piece and the engine assembly and forms a second gas supply pipeline;

[0009] When the first control valve is conducted and the second control valve is closed, the first fuel assembly supplies gas to the engine assembly, and when the first control valve is closed and the second control valve is conducted, the second fuel assembly supplies gas to the engine assembly.

[0010] In some embodiments, the first fuel assembly comprises:

[0011] First fuel gas cylinder, liquid natural gas is arranged in the first fuel gas cylinder;

[0012] a gasifier connected with the first fuel gas cylinder outlet for gasifying liquid natural gas;

[0013] a buffer tank, a first end of which is connected with the gasifier outlet and a second end of which is connected with the first control valve, for storing gaseous natural gas.

[0014] In some embodiments, the gasifier is further connected with the engine assembly through a pipeline and forms a water circulation loop.

[0015] In some embodiments, the first fuel assembly further comprises:

[0016] a shut-off valve connected with the first fuel gas cylinder outlet for cutting off the first fuel gas cylinder output.

[0017] In some embodiments, the first fuel assembly further comprises:

[0018] a flow-limiting valve, a first end of which is connected with the shut-off valve and a second end of which is connected with the gasifier, for controlling the flow of liquid natural gas output by the first fuel gas cylinder.

[0019] In some embodiments, the dual-fuel vehicle gas supply system further comprises:

[0020] a one-way valve, a first end of which is connected with the first control valve and a second end of which is connected with the pipeline connector.

[0021] In some embodiments, the second fuel assembly comprises:

[0022] a second fuel gas cylinder in which compressed natural gas is stored;

[0023] a high-pressure coarse filter connected with the second fuel gas cylinder outlet for filtering compressed natural gas;

[0024] a high-pressure pressure reducer, a first end of which is connected with the high-pressure coarse filter outlet and a second end of which is connected with the pipeline connector, for reducing the pressure of compressed natural gas output by the second fuel gas cylinder.

[0025] In some embodiments, the high-pressure pressure reducer is further connected with the engine assembly through a pipeline and forms a water circulation loop.

[0026] In some embodiments, the engine assembly comprises:

[0027] a third control valve connected with the pipeline connector outlet;

[0028] a mixer connected with the third control valve outlet for forming mixed gas;

[0029] An intake manifold is connected with the mixer outlet for outputting mixed gas.

[0030] In some embodiments, the dual-fuel automobile gas supply system further comprises:

[0031] A low-pressure fine filter has a first end connected with the pipeline connector outlet and a second end connected with the third control valve inlet.

[0032] The beneficial effects brought by the technical scheme of the utility model include:

[0033] The utility model discloses a dual-fuel automobile gas supply system, comprising: first fuel assembly, first control valve, second fuel assembly, second control valve, pipeline connector, engine assembly, first fuel assembly outlet with first control valve, pipeline connector, engine assembly are connected in proper order and form first gas supply pipeline, second fuel assembly outlet with second control valve, pipeline connector, engine assembly are connected in proper order and form second gas supply pipeline, when first control valve is on, and second control valve is closed, first fuel assembly supplies gas for engine assembly, when first control valve is closed, and second control valve is on, second fuel assembly supplies gas for engine assembly, by controlling the on-off of first control valve and second control valve, can arbitrarily select one gas supply pipeline and supply gas for engine assembly, provides two kinds of fuel gas supply mode, and gas vehicle can use two kinds of fuel energy simultaneously, enriches energy use type, and improves energy utilization. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0035] Figure 1 The utility model provides a dual-fuel automobile gas supply system's structural schematic diagram for embodiment of the utility model;

[0036] Reference signs:

[0037] 1, first fuel assembly;11, first fuel gas cylinder;12, gasifier;13, buffer tank;14, stop valve;15, flow limiting valve;

[0038] 2, first control valve;

[0039] 3. Second fuel assembly; 31. Second fuel gas cylinder; 32. High pressure coarse filter; 33. High pressure pressure reducer;

[0040] 4. Second control valve;

[0041] 5. Pipe connecting piece;

[0042] 6. Engine assembly; 61. Third control valve; 62. Mixer; 63. Intake manifold;

[0043] 7. One-way valve;

[0044] 8. Low pressure fine filter;

[0045] 9. Pressure stabilizing valve. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0047] The embodiments of the utility model provide a kind of dual-fuel vehicle gas supply system, it can solve the technical problem that existing gas vehicle in relevant technology alone uses a set of gas supply system can only use corresponding one fuel energy, leading to single energy use type, reduce energy utilization.

[0048] Figure 1 The embodiments of the utility model provide a kind of dual-fuel vehicle gas supply system, it can solve the technical problem that existing gas vehicle in relevant technology alone uses a set of gas supply system can only use corresponding one fuel energy, leading to single energy use type, reduce energy utilization.

[0049] The utility model discloses a double -fuel automobile gas supply system, it is equipped with first fuel assembly, first control valve, second fuel assembly, second control valve, pipeline connecting piece, engine assembly, first fuel assembly export with first control valve, pipeline connecting piece, engine assembly is connected gradually and forms first gas supply pipeline, second fuel assembly export with second control valve, pipeline connecting piece, engine assembly is connected gradually and forms second gas supply pipeline, pipeline connecting piece is tee joint, the first inlet of tee joint is connected with the export of first control valve, the second inlet of tee joint is connected with the export of second control valve, the export of tee joint is connected with engine assembly, first control valve with second control valve all are connected with switch, and the on-off of first control valve and second control valve is controlled through switch, when first control valve is conducted, and second control valve is closed, first fuel assembly is the engine assembly gas supply, when first control valve is closed, and second control valve is conducted, second fuel assembly is the engine assembly gas supply, can arbitrarily select one gas supply pipeline and is the engine assembly gas supply, provides two kinds of fuel gas supply mode, and gas vehicle can use two kinds of fuel energy simultaneously, and the energy use type is enriched, and the energy utilization rate is improved.

[0050] As an optional implementation, in one utility model embodiment, referring to Fig. Figure 1 The first fuel assembly 1 includes a first fuel gas cylinder 11, a gasifier 12 and a buffer tank 13. The first fuel gas cylinder 11 is provided with liquid natural gas. The gasifier 12 is connected with the outlet of the first fuel gas cylinder 11 and is used for gasifying the liquid natural gas. The first end of the buffer tank 13 is connected with the outlet of the gasifier 12, and the second end is connected with the first control valve 2 and is used for storing gaseous natural gas. The first fuel gas cylinder 11 is used for storing liquid natural gas. When the first control valve 2 is conducted and the second control valve 4 is closed, the gasifier 12 gasifies the liquid natural gas in the first fuel gas cylinder 11 and outputs, and the gaseous natural gas is output to the engine assembly 6 through the buffer tank 13, the first control valve 2 and the pipeline connecting piece 5. The buffer tank 13 is used for storing and adjusting gaseous natural gas to alleviate the adverse effects caused by pressure fluctuation and flow change. It can ensure the smooth flow of fuel gas in the first gas supply pipeline, avoid interruption, provide temporary emergency storage during equipment maintenance and ensure the stable operation of the double-fuel automobile gas supply system.

[0051] As an optional implementation, in one utility model embodiment, referring to Fig. Figure 1As shown, the gasifier 12 is also connected with the engine assembly 6 through a pipeline and forms a water circulation loop, the inlet of the gasifier 12 is connected with the engine assembly 6 and introduces hot water of the engine assembly 6, the hot water of the engine assembly 6 is used to heat and convert liquid natural gas into gaseous natural gas, the outlet of the gasifier 12 is connected with the engine assembly 6 and discharges cold water back to the engine assembly 6, so that the gasifier 12 and the engine assembly 6 form a cold and hot water circulation loop.

[0052] As an optional embodiment, in one utility model implementation, referring to Figure 1 As shown, the first fuel assembly 1 further comprises a stop valve 14 connected with the outlet of the first fuel gas cylinder 11 for cutting off the output of the first fuel gas cylinder 11, the stop valve 14 is arranged between the first fuel gas cylinder 11 and the gasifier 12, when the stop valve 14 is turned on, the first fuel gas cylinder 11 outputs liquid natural gas to the gasifier 12, when the stop valve 14 is closed, the first fuel gas cylinder 11 stops outputting liquid natural gas, the stop valve 14 is reliable in operation and tightly closed, which can effectively cut off the gas in the first gas supply pipeline and prevent the gas from flowing back.

[0053] As an optional embodiment, in one utility model implementation, referring to Figure 1 As shown, the first fuel assembly 1 further comprises a flow limiting valve 15, the first end of the flow limiting valve 15 is connected with the stop valve 14, the second end is connected with the gasifier 12, for controlling the flow of liquid natural gas output by the first fuel gas cylinder 11, the flow limiting valve 15 is arranged between the stop valve 14 and the gasifier 12, when the stop valve 14 is turned on and the first fuel gas cylinder 11 outputs liquid natural gas to the gasifier 12, the flow limiting valve 15 is used to limit the flow of liquid natural gas, when the flow rate of liquid natural gas in the first gas supply pipeline exceeds a preset value, the flow limiting valve 15 will automatically close or adjust the opening degree to limit the flow, so as to prevent damage to the pipeline or downstream equipment caused by excessive flow.

[0054] As an optional embodiment, in one utility model implementation, referring to Figure 1 As shown, the dual-fuel vehicle gas supply system further comprises a one-way valve 7, the first end of the one-way valve 7 is connected with the first control valve 2, the second end is connected with the pipeline connecting piece 5, the one-way valve 7 is arranged between the first control valve 2 and the pipeline connecting piece 5, the one-way valve 7 only allows the medium to flow in one direction and prevents the medium from flowing in the opposite direction, which is used to prevent the impurities in the second gas supply pipeline from flowing back to the first gas supply pipeline, so as to protect the first gas supply pipeline and equipment and prolong the service life of the first gas supply pipeline and equipment.

[0055] As an optional implementation, in one utility model implementation, referring to Figure 1 As shown in the figure, the dual-fuel vehicle gas supply system further comprises a pressure stabilizing valve 9, a first end of the pressure stabilizing valve 9 being connected with the one-way valve 7, and a second end of the pressure stabilizing valve 9 being connected with the pipeline connecting piece 5, the pressure stabilizing valve 9 being used for adjusting the gas pressure output by the first gas supply pipeline, so that the gas pressure output by the first gas supply pipeline is within the pressure range usable by the engine assembly 6.

[0056] As an optional implementation, in one utility model implementation, referring to Figure 1 As shown in the figure, the second fuel assembly 3 comprises a second fuel gas cylinder 31, a high-pressure coarse filter 32, and a high-pressure pressure reducer 33, the second fuel gas cylinder 31 being provided with compressed natural gas, the high-pressure coarse filter 32 being connected with an outlet of the second fuel gas cylinder 31 and being used for filtering the compressed natural gas, a first end of the high-pressure pressure reducer 33 being connected with an outlet of the high-pressure coarse filter 32, and a second end of the high-pressure pressure reducer 33 being connected with the pipeline connecting piece 5, the high-pressure pressure reducer 33 being used for reducing the pressure of the compressed natural gas output by the second fuel gas cylinder 31, the second fuel gas cylinder 31 being used for storing the compressed natural gas, when the first control valve 2 is closed and the second control valve 4 is turned on, the high-pressure coarse filter 32 filters the compressed natural gas output by the second fuel gas cylinder 31, and the high-pressure pressure reducer 33 reduces the pressure of the filtered compressed natural gas to the pressure range usable by the engine assembly 6, the compressed natural gas after pressure reduction is output to the engine assembly 6 through the pipeline connecting piece 5, and in addition, the high-pressure pressure reducer 33 and the second control valve 4 can be integrally arranged.

[0057] As an optional implementation, in one utility model implementation, referring to Figure 1 As shown in the figure, the high-pressure pressure reducer 33 is further connected with the engine assembly 6 through a pipeline and forms a water circulation loop, an inlet of the high-pressure pressure reducer 33 being connected with the engine assembly 6 and introducing hot water of the engine assembly 6, in order to prevent the ice blockage throttling of the valve port caused by the condensation of water in the natural gas due to the temperature drop in the process of reducing the pressure of the compressed natural gas, the high-pressure pressure reducer 33 can use the hot water of the engine assembly 6 to absorb heat to alleviate the ice blockage throttling phenomenon, that is, the hot water of the engine assembly 6 is introduced to heat the primary chamber and the secondary chamber, so as to ensure the normal work of the high-pressure pressure reducer 33, and an outlet of the high-pressure pressure reducer 33 being connected with the engine assembly 6 and discharging cold water back to the engine assembly 6, so that the high-pressure pressure reducer 33 and the engine assembly 6 form a circulation loop of cold and hot water.

[0058] As an optional implementation, in one utility model implementation, referring to Figure 1As shown, the engine assembly 6 comprises a third control valve 61 connected with the pipeline connector 5 outlet, a mixer 62 connected with the third control valve 61 outlet for forming mixed gas, and an intake manifold 63 connected with the mixer 62 outlet for outputting mixed gas, wherein the third control valve 61 is a continuous flow control valve (CFV valve) for precisely controlling the fuel gas injection amount of each engine cycle in cooperation with an engine controller, and the mixer 62 is used for introducing air and mixing with gaseous natural gas delivered by the first gas supply pipeline or compressed natural gas delivered by the second gas supply pipeline to form mixed gas, which is then outputted and distributed to each cylinder through the intake manifold 63.

[0059] As an optional embodiment, in one utility model embodiment, referring to Figure 1 As shown, the dual-fuel vehicle gas supply system further comprises a low-pressure fine filter 8, the first end of which is connected with the pipeline connector 5 outlet, and the second end of which is connected with the third control valve 61 inlet, and the low-pressure fine filter 8 is arranged between the pipeline connector 5 and the engine assembly 6 (i.e. the third control valve 61) for filtering the gaseous natural gas delivered by the first gas supply pipeline or the compressed natural gas delivered by the second gas supply pipeline, which can effectively remove impurities, improve the purity and calorific value of the fuel gas, ensure the quality of the fuel gas, and protect the fuel gas equipment from damage and prolong the service life of the equipment.

[0060] In the description of the utility model, it should be explained that the positions or location relationships indicated by the terms "upper", "lower" and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0061] It should be noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0062] The above description is merely that of the specific embodiments of the present application, and enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual fuel vehicle fuelling system characterised in that, The system comprises: a first fuel assembly (1), a first control valve (2), a second fuel assembly (3), a second control valve (4), a pipeline connector (5), an engine assembly (6); the outlet of the first fuel assembly (1) is connected with the first control valve (2), the pipeline connector (5) and the engine assembly (6) in sequence to form a first gas supply pipeline; the outlet of the second fuel assembly (3) is connected with the second control valve (4), the pipeline connector (5) and the engine assembly (6) in sequence to form a second gas supply pipeline; when the first control valve (2) is open and the second control valve (4) is closed, the first fuel assembly (1) supplies gas to the engine assembly (6); when the first control valve (2) is closed and the second control valve (4) is open, the second fuel assembly (3) supplies gas to the engine assembly (6).

2. The dual fuel vehicle fueling system of claim 1, wherein, The first fuel assembly (1) comprises: a first fuel gas cylinder (11) in which liquid natural gas is arranged; a gasifier (12) connected with the outlet of the first fuel gas cylinder (11) for gasifying the liquid natural gas; a buffer tank (13) having a first end connected with the outlet of the gasifier (12) and a second end connected with the first control valve (2) for storing gaseous natural gas.

3. The dual-fuel automobile gas supply system according to claim 2, wherein: the gasifier (12) is further connected with the engine assembly (6) through a pipeline to form a water circulation loop.

4. The dual fuel vehicle fueling system of claim 2, wherein, The first fuel assembly (1) further comprises: a stop valve (14) connected with the outlet of the first fuel gas cylinder (11) for cutting off the output of the first fuel gas cylinder (11).

5. The dual fuel vehicle fueling system of claim 4, wherein, The first fuel assembly (1) further comprises: a flow limiting valve (15) having a first end connected with the stop valve (14) and a second end connected with the gasifier (12) for controlling the flow of the liquid natural gas output by the first fuel gas cylinder (11).

6. The dual fuel vehicle fueling system of claim 2, wherein, The system further comprises: a one-way valve (7) having a first end connected with the first control valve (2) and a second end connected with the pipeline connector (5).

7. The dual fuel vehicle fueling system of claim 1, wherein, The second fuel assembly (3) comprises: a second fuel gas cylinder (31) in which compressed natural gas is arranged; a high-pressure coarse filter (32) connected with the outlet of the second fuel gas cylinder (31) for filtering the compressed natural gas; a high-pressure pressure reducer (33) having a first end connected with the outlet of the high-pressure coarse filter (32) and a second end connected with the pipeline connector (5) for reducing the pressure of the compressed natural gas output by the second fuel gas cylinder (31).

8. The dual-fuel automobile gas supply system according to claim 7, wherein: the high-pressure pressure reducer (33) is further connected with the engine assembly (6) through a pipeline to form a water circulation loop.

9. The dual fuel vehicle fueling system of claim 1, wherein, The engine assembly (6) comprises: a third control valve (61) connected to the outlet of the pipe connection (5); a mixer (62) connected to the outlet of the third control valve (61) for forming mixed gas; an intake manifold (63) connected to the outlet of the mixer (62) for outputting mixed gas.

10. The dual fuel vehicle fueling system of claim 9, wherein, Further comprising: a low-pressure fine filter (8) having a first end connected to the outlet of the pipe connection (5) and a second end connected to the inlet of the third control valve (61).

Images