CN211474292U - Natural gas engine fuel supply system - Google Patents
Natural gas engine fuel supply system Download PDFInfo
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- CN211474292U CN211474292U CN201922164073.5U CN201922164073U CN211474292U CN 211474292 U CN211474292 U CN 211474292U CN 201922164073 U CN201922164073 U CN 201922164073U CN 211474292 U CN211474292 U CN 211474292U
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- pressure reducer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model relates to a natural gas engine fuel supply system, the gas outlet of the natural gas filter assembly of the system is connected with the gas inlet of a pressure reducer through a filter to pressure reducer gas inlet pipe assembly, the gas outlet of the pressure reducer is connected with the gas inlet of a gas metering valve through the pressure reducer to gas metering valve gas inlet pipe assembly, and the gas outlet of the gas metering valve is connected with the natural gas inlet of a three-channel mixer through a natural gas inlet rubber pipe; the mixer air inlet pipe is connected with an air inlet of the three-channel mixer; an EGR waste gas inlet of the three-channel mixer is connected with an EGR waste gas inlet pipe; and the air outlet of the three-channel mixer is connected with the mixer to the air inlet pipe of the cylinder cover. The utility model has the advantages of better air, natural gas and EGR mix the homogeneity index, can satisfy "equivalent burning zone EGR system" and discharge natural gas engine operation requirement for the state six of characteristics.
Description
Technical Field
The utility model relates to a natural gas engine fuel supply system.
Background
Patent document CN208184864U discloses a natural gas engine air intake system, which includes an air intake pipe, an electronic throttle valve is installed through the air intake pipe, the air outlet end of the air intake pipe is connected with a gas mixer, the air outlet end of the gas mixer is connected to an air intake main pipe through an air intake elbow, and the air intake main pipe is connected with an air intake manifold; the electronic throttle valve is used for simply controlling the air feeding amount of the air inlet pipe, after air and natural gas are uniformly mixed in the gas mixer, the air and the natural gas are directly conveyed into the air inlet manifold through the air inlet bent pipe and the air inlet main pipe, and in the conveying process of the air and the natural gas in the air inlet bent pipe, the air and the natural gas can be further mixed in the air inlet bent pipe due to the structural characteristics of the air inlet bent pipe, so that the working consistency of each cylinder of the engine is improved, the stable working of the engine is facilitated, and the damage phenomenon of the engine caused by the nonuniform working of each cylinder is reduced.
Patent document CN107023421A discloses a fuel gas supply system for an LNG natural gas engine, including: the air supply subsystem comprises an air filter, an exhaust gas turbocharger, an intercooler and an electronic throttle valve which are connected in sequence, wherein the electronic throttle valve is used for controlling the supply amount of cooled air; the LNG natural gas supply subsystem comprises an LNG fuel tank, an LNG evaporator, a low-pressure filter, a voltage stabilizer, a low-pressure fuel cut-off valve and a continuous flow valve which are sequentially connected, wherein the low-pressure fuel cut-off valve is used for timely switching on or cutting off the fuel gas supply of a natural gas low-pressure pipeline, and the continuous flow valve is used for calculating and controlling the flow of LNG fuel; and a mixer for mixing the air flowing through the electronic throttle valve and the fuel injected through the continuous flow valve and supplying the mixture to an intake manifold, which is communicated with an intake valve of an engine cylinder.
None of the natural gas engine supply systems disclosed in the above patent documents satisfies the use requirements of the national six-emission natural gas engine featuring the "equivalent combustion zone EGR system", and no special anti-icing, high-safety, and high-integration design is performed. Patent document CN208184864U mainly discloses an air supply system that considers only the mixing of air and gas, and does not consider the mixing of EGR circulation exhaust gas and its influence on the entire supply system. The gas supply system described in patent document CN107023421A is relatively comprehensive, but its structure is relatively complex, the integration level is low, and the mixing of EGR circulation exhaust gas and its influence on the whole supply system are not considered.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a natural gas engine fuel supply system, this system can reach better air, natural gas and EGR mixing homogeneity index, satisfies "equivalent burning area EGR system" and discharges natural gas engine operation requirement for the state six of characteristics.
In order to solve the technical problem, the fuel supply system of the natural gas engine of the utility model comprises a natural gas filter assembly, a filter-to-pressure reducer intake pipe assembly, a pressure reducer, a gas metering valve, a natural gas intake rubber pipe, a mixer intake pipe, a three-channel mixer, a mixer-to-cylinder cover intake pipe; the gas outlet of the natural gas filter assembly is connected with the gas inlet of the pressure reducer through a filter-to-pressure reducer gas inlet pipe assembly, the gas outlet of the pressure reducer is connected with the gas inlet of the gas metering valve through a pressure reducer-to-gas metering valve gas inlet pipe assembly, and the gas outlet of the gas metering valve is connected with the natural gas inlet of the three-channel mixer through a natural gas inlet rubber pipe; the mixer air inlet pipe is connected with an air inlet of the three-channel mixer; an EGR waste gas inlet of the three-channel mixer is connected with an EGR waste gas inlet pipe; and the air outlet of the three-channel mixer is connected with the mixer to the air inlet pipe of the cylinder cover.
Furthermore, the utility model can also comprise an electrically controlled stop valve A; the gas outlet of the natural gas filter assembly is connected with the air inlet of the electric control stop valve A through a filter-to-pressure reducer air inlet pipe assembly, and the gas outlet of the electric control stop valve A is connected with the air inlet of the pressure reducer.
Furthermore, the utility model can also comprise an electrically controlled stop valve B; the gas outlet of the pressure reducer is connected with the gas inlet of the B electric control stop valve through the pressure reducer to the gas metering valve gas inlet pipe assembly, and the gas outlet of the B electric control stop valve is connected with the gas inlet of the gas metering valve.
The pressure reducer and the A electric control stop valve are integrated together to form a pressure reducer electric control stop valve assembly.
The gas metering valve and the B electric control stop valve are integrated together to form a gas metering valve and electric control stop valve assembly.
The EGR waste gas inlet is positioned at the side or the top of the three-channel mixer.
The three-channel mixer is a corrosion-resistant aluminum alloy three-channel mixer.
The natural gas filter assembly, the pressure reducer electric control stop valve assembly, the gas metering valve electric control stop valve assembly and the three-channel mixer are connected through the filter-to-pressure reducer air inlet pipe assembly, the pressure reducer-to-gas metering valve air inlet pipe assembly and the natural gas air inlet rubber pipe respectively to form a natural gas supply path. Air is directed into the three-channel mixer with a mixer inlet duct. EGR exhaust gas is introduced into the system from the side of the three-way mixer. And finally, introducing the combustible homogeneous mixed gas at the outlet of the three-channel mixer into an air inlet channel of the cylinder cover for the engine by using the mixer-to-cylinder cover air inlet pipe.
The utility model discloses an anti-icing stifled, high security, high integration design, it has reached better air, natural gas and EGR mixing uniformity index, and the integrated design scheme of optimization has reduced the part quantity and the leak source in the system, has increased the reliability of system when lowering system cost, has effectively satisfied the user demand of engine.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the utility model discloses a natural gas engine fuel supply system includes natural gas filter assembly 1, filter to pressure reducer intake pipe assembly 2, pressure reducer, the automatically controlled stop valve of A, pressure reducer to gas metering valve intake pipe assembly 4, gas metering valve, the automatically controlled stop valve of B, natural gas air inlet rubber tube 6, blender intake pipe 7, three-channel mixer 8, blender to cylinder cap intake pipe 9.
The natural gas filter assembly 1 is arranged at the upstream of the whole gas supply system, and is used for finely filtering natural gas conveyed to an engine, so that the effect of protecting a moving friction pair in downstream parts is achieved. The gas outlet of the natural gas filter assembly 1 is connected with the air inlet of the electric control stop valve A through a filter-to-pressure reducer air inlet pipe assembly 2, and the gas outlet of the electric control stop valve A is connected with the air inlet of the pressure reducer.
The pressure reducer and the A electric control stop valve can adopt a separately arranged structure, and can also be integrated together to form a pressure reducer electric control stop valve assembly 3, the function of the electric control stop valve is prior to that of the pressure reducer, and when the engine is stopped, the functions of cutting off natural gas supply and sectionally sealing a natural gas pipeline are achieved. The gas outlet of the pressure reducer is connected with the gas inlet of the B electric control stop valve through the pressure reducer to the gas metering valve gas inlet pipe assembly 4, and the gas outlet of the B electric control stop valve is connected with the gas inlet of the gas metering valve.
The gas metering valve and the B electric control stop valve can adopt a separately arranged structure, and can also be integrated together to form a gas metering valve with an electric control stop valve assembly 5, and the function of the electric control stop valve is prior to that of the gas metering; the electric control stop valve is mainly used for protecting the fuel gas metering device.
The utility model discloses set up two automatically controlled stop valves and be out of the theory of redundant design, fully protect as engine core performance part and worth higher gas metering device.
The gas outlet of the gas metering valve is connected to the natural gas inlet of the three-channel mixer 8 through a natural gas inlet rubber tube 6, and natural gas is led into the three-channel mixer 8; the mixer air inlet pipe 7 is connected with an air inlet of the three-channel mixer 8 to guide air into the three-channel mixer 8; an EGR waste gas inlet of the three-channel mixer 8 is connected with an EGR waste gas inlet pipe; the air outlet of the three-channel mixer 8 is connected with the mixer to the cylinder cover air inlet pipe 9, and the combustible homogeneous mixed gas is introduced into the cylinder cover air inlet channel for the use of the engine.
The EGR gas inlet may be located at the top or higher side than the bottom of the three-way mixer 8.
The three-channel mixer 8 is internally provided with three gas channels which are used for respectively conveying air, natural gas and EGR waste gas, and uniformly mixing the three gases to provide uniformly mixed combustible mixed gas for the engine. In order to reduce the weight and resist the corrosion of the mixed gas, the material of the three-channel mixer 8 is corrosion-resistant aluminum alloy. Meanwhile, in consideration of the fact that the EGR waste gas contains a large amount of water vapor and generates condensed water when meeting air with relatively low temperature, in order to prevent ice blockage in winter, the EGR waste gas inlet of the three-channel mixer 8 is arranged on the side surface in consideration of the space requirement of structural arrangement.
The minimum diameter of the pipeline from the filter to the pressure reducer air inlet pipe assembly 2 and the pipeline from the pressure reducer to the gas metering valve air inlet pipe assembly 4 is set to be more than 12mm so as to meet the gas demand of the engine.
The mixer-to-cylinder head intake pipe 9 adopts a smooth trend design so as to minimize the loss of the mixed pneumatic energy due to the turning of the pipeline.
Claims (7)
1. A fuel supply system of a natural gas engine is characterized by comprising a natural gas filter assembly (1), a filter-to-pressure reducer air inlet pipe assembly (2), a pressure reducer, a gas metering valve, a natural gas inlet rubber pipe (6), a mixer air inlet pipe (7), a three-channel mixer (8) and a mixer-to-cylinder cover air inlet pipe (9); the gas outlet of the natural gas filter assembly (1) is connected with the gas inlet of the pressure reducer through a filter-to-pressure reducer gas inlet pipe assembly (2), the gas outlet of the pressure reducer is connected with the gas inlet of the gas metering valve through a pressure reducer-to-gas metering valve gas inlet pipe assembly (4), and the gas outlet of the gas metering valve is connected with the natural gas inlet of the three-channel mixer (8) through a natural gas inlet rubber pipe (6); the mixer air inlet pipe (7) is connected with an air inlet of a three-channel mixer (8); an EGR waste gas inlet of the three-channel mixer (8) is connected with an EGR waste gas inlet pipe; and the air outlet of the three-channel mixer (8) is connected with the mixer to the cylinder cover air inlet pipe (9).
2. The natural gas engine fuel supply system as claimed in claim 1, further comprising an electrically controlled stop valve a; the gas outlet of the natural gas filter assembly (1) is connected with the air inlet of the A electric control stop valve through a filter-to-pressure reducer air inlet pipe assembly (2), and the gas outlet of the A electric control stop valve is connected with the air inlet of the pressure reducer.
3. The natural gas engine fuel supply system as claimed in claim 1, further comprising B electrically controlled stop valves; the gas outlet of the pressure reducer is connected with the gas inlet of the B electric control stop valve through a pressure reducer-gas metering valve gas inlet pipe assembly (4), and the gas outlet of the B electric control stop valve is connected with the gas inlet of the gas metering valve.
4. The natural gas engine fuel supply system according to claim 2, wherein the pressure reducer is integrated with the electrically controlled stop valve A to form a pressure reducer electrically controlled stop valve assembly (3).
5. The natural gas engine fuel supply system according to claim 3, wherein the gas metering valve and the B electric control stop valve are integrated to form a gas metering valve and electric control stop valve assembly (5).
6. The natural gas engine fuel supply system as claimed in claim 1, wherein the EGR exhaust gas intake port is located at the side or top of the three-way mixer (8).
7. The natural gas engine fuel supply system according to claim 1, wherein the three-channel mixer (8) is a corrosion-resistant aluminum alloy three-channel mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922164073.5U CN211474292U (en) | 2019-12-06 | 2019-12-06 | Natural gas engine fuel supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922164073.5U CN211474292U (en) | 2019-12-06 | 2019-12-06 | Natural gas engine fuel supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211474292U true CN211474292U (en) | 2020-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922164073.5U Active CN211474292U (en) | 2019-12-06 | 2019-12-06 | Natural gas engine fuel supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211474292U (en) |
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2019
- 2019-12-06 CN CN201922164073.5U patent/CN211474292U/en active Active
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