CN210068343U - High-pressure gas fuel supply system for single-cylinder engine test platform of dual-fuel engine - Google Patents
High-pressure gas fuel supply system for single-cylinder engine test platform of dual-fuel engine Download PDFInfo
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- CN210068343U CN210068343U CN201920612498.5U CN201920612498U CN210068343U CN 210068343 U CN210068343 U CN 210068343U CN 201920612498 U CN201920612498 U CN 201920612498U CN 210068343 U CN210068343 U CN 210068343U
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Abstract
The utility model belongs to the technical field of engine combustion, and discloses a high-pressure gas fuel supply system of a single cylinder test platform of a dual-fuel engine, which mainly comprises a test cylinder high-pressure gas fuel supply unit, a high-pressure gas circuit detection and protection unit, a high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism and an engine test cylinder gas injection unit; the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism comprises a gas fuel pressure regulating assembly which is communicated with the fuel common rail device, so that the real-time conduction of the fuel pressure to the gas fuel pressure is realized, and the gas supply pressure stabilizing and regulating mode in the test cylinder is simplified. The utility model discloses associate gaseous fuel pressure control and fuel control, mediate gaseous fuel pressure with ripe fuel pressure control technique, control the experimental burning boundary condition of dual fuel and the relevant parameter that the injection process relates in a flexible way, realized the simple and direct control of pressure, temperature, the component of admitting air, improved experimental efficiency, reduced the research cost.
Description
Technical Field
The utility model belongs to the technical field of the engine combustion, concretely relates to high-pressure gas fuel feeding system of double fuel engine single cylinder engine test platform.
Background
Worldwide, energy consumption continues to increase rapidly, and energy crisis represented by petroleum is becoming more prominent. Meanwhile, pollutants caused by the use of a large amount of natural resources also bring huge ecological environment problems to the atmospheric environment and the urban environment. In the case of diesel engines, the emission products of diesel engines are mainly NOx and PM, and the harmful emissions present in the atmospheric environment are manifested by the formation of photochemical smog, acid rain, and the global warming effect.
Under the multiple pressure of energy, environment and (precious metal) resources, the international requirements on pollution emission in the engine industry are increasingly strict, and the realization of efficient clean combustion of the engine becomes a research focus. Gaseous fuel occupies a greater and greater proportion in an energy consumption structure as clean energy, and the emergence of gaseous fuel engines greatly improves the energy consumption problem and the pollution emission problem of the engines. However, research and analysis has shown that gas engines currently using gaseous fuel as the sole fuel have thermal efficiencies that are nearly 10% lower than conventional engines. The dual-fuel engine ensures the reliability and high thermal efficiency similar to those of the traditional engine and simultaneously considers the economical efficiency and environmental protection of the engine. Test research proves that the smoke intensity of the engine under the dual-fuel working condition basically achieves zero emission, and the emission of NOx near a heavy load is reduced by about 65 percent compared with that of the original engine. The development of dual fuel engines into the transitional phase technology for the transition of traditional engines to gas engines will dominate the market in the next decades.
The technical research on the dual-fuel engine is a hot spot of the research in the field of engines of domestic and foreign research institutes, enterprises and universities at present. In the field of bi-fuel engines, the design of fuel supply systems is central to the design of gaseous fuel/diesel bi-fuel engines. Among these, the gaseous fuel supply system, which is a considerable part of the fuel supply system of a dual-fuel engine, influences the operating state of the engine, especially the combustion process of the engine, to a large extent. Therefore, the reliable, efficient and intelligent gas fuel supply system is designed to play a crucial basic guarantee role in the research of the dual-fuel engine.
At present, research on a supply system is mainly in the field of gas engines, and the gas fuel supply system required by a single-cylinder dual-fuel engine test platform modified by a diesel engine is irrelevant, the most main requirement of the gas fuel supply system required by the dual-fuel single-cylinder engine test platform is to ensure the stability and control of combustion boundary conditions in the test process, and if gas quantity control is unstable, the heat efficiency change fluctuation is large, and the combustion effect analysis precision is poor; meanwhile, the gas fuel pipeline is used as an engine high-risk auxiliary pipeline, and continuous state monitoring is required to be kept in the test process, so that high requirements on flexibility, controllability and safety of the system and stability of various parameters of fuel supply are met. It is necessary to develop a control method for simply controlling the pressure of the gaseous fuel in the dual-fuel combustion test, so as to solve the problem of stabilizing and controlling the boundary conditions of the dual-fuel combustion, especially the boundary conditions of the gaseous fuel combustion.
Disclosure of Invention
In order to solve the problem, the utility model provides a high-pressure gas fuel feeding system of double fuel engine single cylinder engine test platform. The method aims to realize the dual-fuel supply of the engine, simultaneously ensure the stability and the control of the dual-fuel combustion boundary condition, particularly the stability and the control of the gas fuel combustion boundary condition, and ensure the reliability and the safety of a single-cylinder engine test platform supply system of the dual-fuel engine.
The utility model adopts the technical scheme as follows:
a high-pressure test cylinder gas fuel supply system of a dual-fuel engine single cylinder test platform is applied to the dual-fuel engine single cylinder test platform; the dual-fuel engine single-cylinder engine test platform comprises a multi-cylinder engine connected with a dynamometer module, a data acquisition system and an engine control system; the power source of the multi-cylinder engine is an air module and a fuel module which are installed in parallel; the test cylinder power module is connected with one cylinder body serving as a test cylinder in the multi-cylinder engine, and the dragging cylinder power module is connected with other cylinder bodies serving as dragging cylinders in the multi-cylinder engine; the power module of the dragging cylinder is connected to the dragging cylinder and comprises the air module and the fuel module which are installed in parallel, namely the power of the multi-cylinder engine is adopted; the test cylinder power module is connected to the test cylinder, comprises a test cylinder air module and a test cylinder dual-fuel supply module which are installed in parallel, and provides air and fuel for the test cylinder; the test cylinder dual-fuel supply module comprises a test cylinder fuel supply module and a test cylinder high-pressure gas fuel supply module which are installed in parallel, and the fuel is provided for the test cylinder; the test cylinder fuel supply module comprises an engine fuel common rail device; the test cylinder high-pressure gas fuel supply module comprises a high-pressure gas fuel supply unit, a high-pressure gas path detection protection unit, a high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism and an engine test cylinder jet unit which are sequentially connected in series, wherein the engine test cylinder jet unit is connected to the test cylinder; the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism is connected with the engine fuel common rail device and receives real-time pressure conduction of the engine fuel common rail device; the data acquisition system acquires the air pressure of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism, transmits the air pressure to the engine control system, and transmits a timing and quantitative jet feedback control signal output by the engine control system back to the jet unit of the engine test cylinder; the data acquisition system acquires gas parameter data in the high-pressure gas path detection protection unit, transmits the data to the engine control system and is used for judging the state of the gas fuel supply system of the high-pressure test cylinder.
The high-pressure gas fuel supply unit comprises a high-pressure gas fuel source, a high-pressure gas fuel regulation and control integrated device and a high-pressure gas fuel exhaust integrated device, wherein the high-pressure gas fuel source, the high-pressure gas fuel regulation and control integrated device and the high-pressure gas fuel exhaust integrated device are sequentially connected; the high-pressure gas fuel exhaust integrated device is communicated with the high-pressure gas fuel regulation and control integrated device in a two-way mode and is connected with a loop of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism.
The high-pressure gas circuit detection and protection unit comprises a pneumatic stop valve, a flame arrester and a gas consumption instrument which are connected in sequence; and the data acquisition system detects and acquires the high-pressure gas flow and consumption data in the gas consumption instrument in real time and transmits the data to the engine control system.
The fuel/gas fuel linkage control pressure stabilizing mechanism comprises a plunger, a compression spring and a spring adjusting knob which are sequentially connected to a fuel pressure introducing main channel; the fuel pressure introducing main channel is communicated with fuel from the fuel common rail device; a gas fuel exhaust channel is arranged on the side wall of the fuel pressure introducing main channel at the initial section of the working stroke of the plunger and is connected to the high-pressure gas fuel regulation and control integrated device; the middle section of the working stroke of the plunger is provided with a gas fuel entering a test cylinder channel and connected to the engine test cylinder jet unit; a gas fuel inlet channel is arranged in the working stroke of the compression spring and is connected with the gas consumption instrument; the plunger; the length is greater than the maximum distance of the gaseous fuel exhaust passage from the horizontal direction of the gaseous fuel inlet passage into the test cylinder.
The engine test cylinder jet unit is a gas fuel jet valve, and the opening and closing time of the gas fuel jet valve is controlled by the engine control system, so that the timing and quantitative control of the gas fuel entering the test cylinder is realized.
The gaseous fuel injection valve is an electromagnetic valve.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
(1) compared with the existing gas fuel supply system, the gas fuel pressure stabilizing unit of the high-pressure gas fuel supply system of the dual-fuel engine single cylinder engine test platform creatively introduces the fuel pressure control into the gas pressure control process, associates the complex gas fuel pressure control with the simple fuel pressure control, and simplifies the gas pressure control mode before entering the cylinder; the gas pressure control is linked with the fuel oil pressure control in real time, and the mature fuel oil pressure control technology is used in the field of complex gas fuel pressure control. The flexibility, reliability and stability of the mode are highly guaranteed, and the stability of the boundary condition of dual-fuel combustion is further guaranteed.
(2) The utility model discloses in dual fuel engine single cylinder engine test platform's high-pressure gas fuel feed system adopt the modularization to handle, can reduce system complexity in the practical application by a wide margin, the maintenance of system is very convenient.
(3) The utility model relates to a gas circuit monitoring and protecting unit, which can judge the state by monitoring the gas flow of a pipeline in real time; once abnormal conditions occur, the pneumatic stop valve can immediately act to cut off the supply pipeline of gas to the engine, and meanwhile, the flame arrester can prevent the backfire in the pipe from spreading to the high-pressure gas fuel section; the gas consumption meter has the function of monitoring the gas flow state of the gas fuel supply system pipeline, and simultaneously records the gas fuel consumption so as to provide basic data such as the gas fuel consumption for the test.
Drawings
FIG. 1 is the structure schematic diagram of the single cylinder engine test platform assembly of the utility model
FIG. 2 is a schematic structural view of the test cylinder high-pressure gas fuel supply unit of the present invention
FIG. 3 is a schematic structural diagram of the fuel/gas fuel linkage control pressure stabilizing mechanism of the present invention
Wherein: m-multi-cylinder engine A-gas fuel inlet channel B-gas fuel exhaust channel C-gas fuel entering test cylinder channel D-fuel pressure introducing main channel E-exhaust channel 1-dragging cylinder air module 2-test cylinder air module 3-dragging cylinder fuel module 4-test cylinder fuel supply module 401-test cylinder fuel supply device 402-fuel common rail device 403-fuel electric control fuel injection device 404-oil return pump 5-dynamometer module 6-test cylinder dual fuel supply module 7-test cylinder high-pressure gas fuel supply module 701-test cylinder high-pressure gas fuel supply unit 7011-high-pressure gas fuel source 7012-gas fuel regulation and control integrated device 7013-high-pressure gas 702-high-pressure gas path detection and protection unit 7021-pneumatic stop valve 7022-flame arrester 7023-gas consumption instrument 703-high-pressure fuel/gas fuel linkage control and pressure stabilization mechanism 7031-plunger 7032-compression bullet Spring 7033, spring adjusting knob 704, engine test cylinder jet unit
Detailed Description
The utility model relates to a high-pressure test jar gaseous fuel feed system of dual fuel engine single cylinder engine test platform, mainly used is with the linkage that gaseous fuel pressure control and fuel pressure control go on in the dual fuel engine to solve the stability and the control of dual fuel burning boundary condition, especially gaseous fuel burning boundary condition's stability and control.
The following embodiments are used to explain the present invention:
a high-pressure test cylinder gas fuel supply system of a dual-fuel engine single cylinder test platform is applied to the dual-fuel engine single cylinder test platform; the dual-fuel engine single-cylinder engine test platform comprises a multi-cylinder engine M connected with a dynamometer module 5, a data acquisition system and an engine control system; the power source of the multi-cylinder engine M is an air module 1 and a fuel module 3 which are installed in parallel; the system also comprises a test cylinder power module connected with one cylinder body serving as a test cylinder in the multi-cylinder engine M and a dragging cylinder power module connected with other cylinder bodies serving as dragging cylinders in the multi-cylinder engine M; the power module of the dragging cylinder is connected to the dragging cylinder and comprises an air module 1 and a fuel module 3 which are installed in parallel, namely the power of the multi-cylinder engine M is adopted; the test cylinder power module is connected to the test cylinder, comprises a test cylinder air module 2 and a test cylinder dual-fuel supply module 6 which are installed in parallel and provides air and fuel for the test cylinder; the test cylinder dual-fuel supply module 6 comprises a test cylinder fuel supply module 4 and a test cylinder high-pressure gas fuel supply module 7 which are installed in parallel, and the fuel is provided for the test cylinder; the test cylinder fuel supply module 4 comprises an engine fuel common rail device 402; the test cylinder high-pressure gas fuel supply module 7 comprises a high-pressure gas fuel supply unit 701, a high-pressure gas circuit detection protection unit 702, a high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 and an engine test cylinder jet unit 704 which are sequentially connected in series, wherein the engine test cylinder jet unit 704 is connected to a test cylinder; the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 is connected with the engine fuel common rail device 402 and receives real-time pressure conduction of the engine fuel common rail device 402; the data acquisition system acquires the air pressure of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703, transmits the air pressure to the engine control system, and transmits a timing and quantitative jet feedback control signal output by the engine control system back to the jet unit 704 of the engine test cylinder; the data acquisition system acquires gas parameter data in the high-pressure gas path detection protection unit 702, and transmits the data to the engine control system for judging the state of the gas fuel supply system of the high-pressure test cylinder.
The high-pressure gas fuel supply unit 701 comprises a high-pressure gas fuel source 7011, a high-pressure gas fuel regulation and control integrated device 7012 and a high-pressure gas fuel exhaust integrated device 7013, wherein the high-pressure gas fuel source 7011, the high-pressure gas fuel regulation and control integrated device 7012 are connected to the high-pressure gas circuit detection and protection unit 702 in sequence, and the tail end of the high-pressure gas fuel exhaust integrated device 7013; the high-pressure gas fuel exhaust integrated device 7013 is in bidirectional communication with the high-pressure gas fuel regulation integrated device 7012 and is connected with a loop of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703.
The high-pressure gas circuit detection protection unit 702 comprises a pneumatic stop valve 7021, a flame arrester 7022 and a gas consumption instrument 7023 which are connected in sequence; the data acquisition system detects and acquires the high-pressure gas flow and consumption data in the gas consumption instrument 7023 in real time and transmits the data to the engine control system.
The fuel/gas fuel linkage control pressure stabilizing mechanism 703 comprises a plunger 7031, a compression spring 7032 and a spring adjusting knob 7033 which are sequentially connected to a fuel pressure introducing main channel D; the fuel pressure introducing main passage D introduces fuel from the fuel common rail device 402; a gas fuel exhaust passage B is formed in the side wall of the fuel pressure introduction main passage D at the initial stage of the operating stroke of the plunger 7031, and is connected to the high-pressure gas fuel regulation and control integration device 7012; the middle section of the working stroke of the plunger 7031 has gas fuel entering a test cylinder channel C and is connected to an engine test cylinder jet unit 704; a gas fuel inlet channel A is arranged in the working stroke of the compression spring 7032 and is connected with a gas consumption instrument 7023; the plunger 7031 has a length greater than the maximum distance of the gaseous fuel exhaust passage B from the horizontal direction of the gaseous fuel intake passage C.
The engine test cylinder jet unit 704 is a gas fuel jet valve, and the engine control system controls the opening and closing time of the gas fuel jet valve to realize the timing and quantitative control of the gas fuel entering the test cylinder.
The gas fuel injection valve is an electromagnetic valve.
The technical solution of the present invention is explained in more detail below with reference to fig. 1:
as shown in FIG. 1, the dual-fuel single-cylinder engine bench test system of the present invention selects an eddy current dynamometer manufactured by Kaimei electromechanical Co., Ltd as a dynamometer module 5; the dynamometer is connected with an Weichai diesel WP12 series six-cylinder diesel engine through a coupling; 1 cylinder in the six-cylinder diesel engine is used as a test cylinder and is an important part of a test cylinder power module; the other 5 cylinders are used as dragging cylinders and are an important part of a dragging cylinder power module.
The dragging cylinder power module comprises a dragging cylinder air module 1 and a dragging cylinder fuel oil module 3 which are connected in parallel and provide stable power for the dragging cylinder to operate.
The test cylinder power module comprises a test cylinder air module 2 and a test cylinder dual-fuel supply module 6 which are connected in parallel and jointly adjust various parameters including air inlet states of the test cylinder in real time, wherein the parameters include air inlet temperature, pressure, flow, components and the like. The test cylinder air module 2 comprises a test cylinder air inlet state adjusting module 210 and an air inlet state monitoring module 220 connected to the test cylinder air inlet state adjusting module 210; the test cylinder air inlet state adjusting module 210 comprises a test cylinder air inlet device communicated with a test cylinder and a test cylinder waste gas recirculation device connected back to the air inlet end of the test cylinder air inlet state adjusting module 210 from the outlet of the test cylinder; the data acquisition system acquires various intake control parameters of the intake state monitoring module 220 during real-time rotation speed and load, transmits the data to the engine control system, and transmits back a real-time control signal sent by the engine control system to the test cylinder intake state adjusting module 210. The test cylinder dual-fuel supply module 6 comprises a test cylinder fuel supply module 4 and a test cylinder high-pressure gas fuel supply module 7; the test cylinder fuel supply module 4 comprises a test cylinder fuel supply device 401, a fuel common rail device 402 for pressurizing fuel, a fuel electric control fuel injection device 403 and a return pump 404, wherein the test cylinder fuel supply device 401, the fuel common rail device 402 for pressurizing fuel, the fuel electric control fuel injection device 403 and the return pump 404 are sequentially connected in series; the fuel oil electronic control oil injection device 403 is arranged on the test cylinder; the data acquisition system acquires real-time pressure and crankshaft and camshaft signals of the fuel common rail device 402, transmits the signals to the engine control system, and transmits real-time fuel injection feedback control signals of the engine control system back to the fuel electronic control fuel injection device 403; the test cylinder high-pressure gas fuel supply module 7 will be described in detail later.
The dragging cylinder air module 1 in the dual-fuel single-cylinder engine bench test system of the utility model prolongs the widely used multi-cylinder dual-fuel engine air module; the dragging cylinder fuel module 3 adopts a conventional multi-cylinder diesel engine fuel module, and particularly adopts a high-pressure common-rail type fuel supply module in the embodiment.
The utility model discloses an engine control system, dynamometer system 5, data acquisition system need choose for use, arrange according to concrete experimental requirement, test condition. These sections are well established techniques.
The data acquisition system adopted in this embodiment is a conventional technical device, and generally includes a sensor, a signal conditioner, a data acquisition card, and measurement acquisition software integrated in a computer.
The engine control system of the utility model is a fuel and gas dual-fuel engine control system, which not only integrates the theoretical data of the multi-cylinder engine M (the utility model mainly refers to a dragging cylinder) for integral control, but also integrates the theoretical data of the dual-fuel single-cylinder test cylinder for integral control; the data integrated in the present embodiment includes injection timing, injection pressure, injection amount of fuel and gas, and the intake air state includes intake air pressure and the like. The engine control system also integrates process control programs for generating a real-time control strategy (namely a feedback control signal) by performing iterative calculation on the theoretical data and the real-time experimental data, wherein the process control programs comprise process control programs such as oil injection timing control, oil injection quantity control, air injection timing control, oil/air pressure control and the like.
The following contrast is attached to 2 ~ 3, and it is important to be right the utility model discloses a module 7 is supplied with to experimental jar high-pressure gas fuel carries out the detailed description:
the main function of the test cylinder high pressure gaseous fuel supply module 7 is to give reliable gaseous fuel supply for ensuring engine operation, the result of which is shown in figure 2. The module is theoretically required to be capable of flexibly controlling, namely, the pressure and the flow of the gas fuel can be adjusted in a wide enough range when a single cylinder of the engine works so as to meet the flexible control requirements of the supply pressure and the flow of the gas fuel under different engine working conditions; meanwhile, the module is also required to be capable of monitoring the consumption and the flow state of the gas fuel in real time, and the safety of the test cylinder high-pressure gas fuel supply module 7 and the multi-cylinder engine M is guaranteed.
The main components of the gas supply pipeline of the test cylinder high-pressure gas fuel supply module 7 comprise a high-pressure gas fuel source 7011 and a gas fuel regulation and control integrated device 7012 in a test cylinder high-pressure gas fuel supply unit 701, a high-pressure gas pipeline detection and protection unit 702, a fuel/gas fuel linkage control pressure stabilizing mechanism 703 and an engine test cylinder gas injection unit 704 which are sequentially connected. An engine test cylinder jet unit 704 is connected to the test cylinder. The high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 comprises a plunger 7031, a compression spring 7032 and a spring adjusting knob 7033 which are connected in sequence; the high-pressure gas circuit detection protection unit 702 comprises a pneumatic stop valve 7021, a flame arrester 7022 and a gas consumption instrument 7023 which are connected in sequence; the gas fuel regulation and control integrated device 7012 comprises a ball valve, a needle valve for gas intake, a high-pressure section gas filter, a pressure reducing valve, a check valve for gas intake and a low-pressure section gas filter which are connected in sequence; a high-pressure gas fuel exhaust integration device 7013 is further connected to the rear end of the gas inlet needle valve to the exhaust passage E; the high-pressure gas fuel exhaust integrated device 7013 comprises an electric control three-way valve, an exhaust needle valve and an exhaust end gas filter which are connected in sequence and connected with the outlet of the air inlet needle valve, wherein the exhaust end gas filter is directly communicated with an exhaust passage E; the fuel/gas fuel linkage control pressure stabilizing mechanism 703 is connected back to the electric control three-way valve through the exhaust one-way valve via the channel B; the two paths jointly form a high-pressure gas fuel exhaust passage which is matched with the adjustment of the pressure of the high-pressure gas fuel.
The fuel pipeline of the test cylinder high-pressure gas fuel supply module 7 is connected to the fuel introducing channel D in fig. 3 and communicated with the fuel common rail device 402, so that the linkage adjustment of the real-time pressure of the fuel common rail device 402 and the pressure of the gas fuel in the fuel/gas fuel linkage control pressure stabilizing mechanism 703 can be realized.
Before the engine is ready to operate, a ball valve external to high pressure gaseous fuel source 7011 is opened to provide gaseous fuel at a pressure (20 MPa in this embodiment) to the system. Before the needle valve for intake is not opened, the gas fuel cannot enter the supply line; when the engine needs gas fuel during working, after the gas inlet needle valve is opened, the gas fuel with certain pressure flows through a high-pressure section gas filter (the function of the gas filter is to separate and purify the gas fuel and effectively filter dirt in a pipeline so as to ensure the safe operation of gas transmission and rear-end equipment and meet the quality requirement of the engine on the gas fuel), then the gas fuel passes through the gas inlet needle valve, is decompressed by a decompression valve and enters a gas supply low-pressure end pipeline, a high-pressure gauge and a low-pressure gauge are arranged in front of and behind the decompression valve, the high-pressure gauge is used for monitoring the residual gas pressure of an external gas source and the gas fuel pressure before decompression, and the low; after gas fuel passes through the pressure reducing valve and then passes through the one-way valve for gas inlet (the one-way valve for gas inlet is arranged to prevent diesel oil from entering the gas supply pipeline once the diesel oil in the gas supply and pressure stabilization unit enters the gas supply pipeline to prevent the diesel oil from permeating to an upstream pipeline and prevent the diesel oil from entering a gas cylinder to pollute the quality of the gas fuel and influence the reliability of the system), the gas fuel is connected with a low-pressure section gas filter (the function of the gas filter is consistent with that of a high-pressure section gas; then the air supply pipeline enters a high-pressure air channel detection protection unit 702, and is firstly connected with a remote-control pneumatic stop valve 7021 (the function of the pneumatic stop valve is to remotely and rapidly cut off the supply of gas fuel to the engine, and the pneumatic valve is mainly adopted in consideration that the explosion-proof performance of an electronic element is not good when a pneumatic mechanical element is adopted in the pipeline design of the gas fuel); a flame arrester 7022 (which is used for preventing flame from entering a high-pressure end gas supply pipeline under an accidental condition and preventing the flame from spreading among pipelines) is connected behind the pneumatic stop valve 7021; a gas consumption instrument 7023 is connected behind the flame arrester 7022 (the gas consumption instrument 7023 is used for detecting the flow rate of gas supplied to an engine by a system and the flowing state of gas in a supply system, judging that the rear end of the gas consumption instrument of the high-pressure gas fuel supply system leaks when the sudden increase of the flow rate is detected, judging that the front end of the gas consumption instrument 7023 of the high-pressure gas fuel supply system leaks or the front end of the gas consumption instrument 7023 of the high-pressure gas fuel supply system blocks a pipeline when the sudden decrease of the flow rate is detected, transmitting an abnormal signal to an engine control system for corresponding audible and visual alarm reminding, and meanwhile, in order to prevent the inaccurate consumption of the gas fuel of the engine brought by the leakage of the gas fuel in the supply pipeline from causing error influence on test analysis), and the gas consumption instrument 7023; the fuel oil/gas fuel linkage control pressure stabilizing mechanism 7031 in the high-pressure fuel oil/gas fuel linkage control pressure stabilizing mechanism 703 is connected behind the gas consumption instrument 7023 and is used for keeping the pressure of gas fuel entering a single-cylinder jet unit of the engine stable and giving the engine a stable combustion boundary condition; the stable pressure gas fuel enters the engine cylinder through a gas fuel injection valve 7041 in the engine test cylinder injection unit 704 to be combusted to release heat to do work.
When the engine normally works, the electric control three-way valve in the high-pressure gas fuel exhaust integrated device 7013 is connected to two ends of return air to lock one end of the exhaust passage E, a part of gas fuel generated in the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 enters a return air pipeline connected between the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 and the high-pressure gas fuel exhaust integrated device 7013, and the part of gas fuel returns to the fuel regulation and control integrated device 7012 again through the electric control three-way valve in the high-pressure gas fuel exhaust integrated device 7013 to enter a gas fuel supply system to be supplied to the high-pressure gas path detection and protection unit 702; the purpose of arranging a check valve for exhaust in the gas return pipeline is to prevent gas at a high-pressure end from directly entering the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 through the gas return pipeline, so that the pressure reducing valve and the gas consumption instrument 7023 cannot work normally; when the working condition of the engine does not need the gas fuel quantity, closing the needle valve for gas inlet, and stopping the gas supply of the supply system to the engine; after the engine is stopped, when the residual gas fuel in the supply system needs to be exhausted, the gas inlet needle valve is kept closed, the gas exhaust needle valve is opened, at the moment, two gas return pipelines connected with the electric control three-way valve become exhaust pipelines at high and low pressure ends, the residual gas fuel in the pipelines at the high/low pressure ends of the supply system passes through the gas exhaust needle valve, and the gas filter at the exhaust end is exhausted to the external atmosphere through the exhaust passage E.
The main parts of the fuel/gas fuel linkage control pressure stabilizing mechanism 703 of the present invention are a plunger 7031, a compression spring 7032, and a spring adjusting knob 7033, and the schematic structural diagram is shown in fig. 3. This section has four channels: the fuel pressure is introduced into one end of the main channel D at the left side and is connected with a fuel common rail device 402; the fuel pressure is introduced into the upper part of the main channel D (the middle section of the working stroke of the plunger 7031), and the channel for gas fuel to enter the test cylinder channel C; the lower left side (the initial stage of the working stroke of the plunger 7031) is a gas fuel exhaust passage B where fuel pressure is introduced into the main passage (D) and communicates to the exhaust check valve shown in fig. 2; the port on the left side of the lower part (on the working stroke of the compression spring 7032) is a gas fuel inlet channel A of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism 703 and is communicated with a gas consumption instrument 7023. After the engine is started, if the pressure of the gas fuel is not supplied, the pressure of the gas fuel in the channel A is 0, the left side fuel pressure is from the fuel pressure in a fuel common rail device 402 of the engine, the plunger 7031 is pushed to the right side limit position by the fuel pressure, at the moment, the plunger 7031 just blocks a channel C entering an injection unit of a test cylinder of the engine, and meanwhile, the length of the plunger 7031 is greater than the maximum horizontal distance between a gas fuel exhaust channel B and the gas fuel entering the test cylinder channel C, so that the gas fuel exhaust channel B is also in a blocked state, and a gas fuel inlet channel A is not blocked and is kept communicated with a right side cavity of the plunger 7031; when gas fuel starts to be supplied, a ball valve and an air inlet needle valve at the front end of a high-pressure gas fuel source 7011 are opened, the pressure of the gas fuel in the system rises, when the pressure of the gas fuel increases to a certain degree, the pressure of the gas fuel is added with the elastic force of a compression spring 7032, so that the pressure of the fuel from a fuel common rail device 402 can be counteracted, a plunger 7031 moves leftwards, the gas fuel is not blocked to enter a test cylinder channel C, the state of a gas fuel exhaust channel B is continuously kept blocked by the plunger, at the moment, a gas fuel inlet channel A is communicated with the gas fuel entering the test cylinder channel C of an engine test cylinder injection unit, the gas fuel enters a cylinder for combustion, and at the moment, the difference value between the pressure of the gas fuel and the pressure; if the pressure of the gas fuel continues to rise, the plunger 7031 continues to move left, at this time, the gas fuel exhaust channel B is not blocked by the plunger any more, at this time, the gas fuel inlet channel A is communicated with the gas fuel exhaust channel B, and the gas fuel entering the injection unit of the engine test cylinder enters the test cylinder channel C; after the pressure of the gas fuel on the right side is reduced, the plunger piston moves to the right due to the action of the fuel pressure until the plunger piston 7031 blocks the gas fuel exhaust passage B again, and at the moment, the difference value between the gas fuel pressure and the fuel pressure is also the elastic force value of the compression spring 7032. It can be seen that the pressure of the gaseous fuel entering the injector unit 704 of the engine test cylinder is always a fixed difference from the fuel pressure, and therefore, a pressure stabilizing effect can be achieved. Meanwhile, the spring adjusting knob 7033 is used to adjust the pre-tightening force of the compression spring 7032 to adjust the pressure difference between the gas fuel and the fuel, and also to ensure that the plunger 7031 does not abut against the gas fuel inlet passage a, so that the gas fuel inlet passage a is always in a ventilation state.
The above is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. The present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive. Those skilled in the art can now make numerous changes in the form and arrangement of parts without departing from the spirit and scope of the invention as defined by the appended claims. All simple transform through structure and components and parts among the prior art in order to reach the utility model discloses an aim all belongs to within the protection scope of the utility model.
Claims (6)
1. A high-pressure gas fuel supply system of a dual-fuel engine single-cylinder engine test platform is applied to the dual-fuel engine single-cylinder engine test platform; the dual-fuel engine single-cylinder engine test platform comprises a multi-cylinder engine (M) connected with a dynamometer module (5), a data acquisition system and an engine control system; the power source of the multi-cylinder engine (M) is an air module (1) and a fuel module (3) which are installed in parallel;
the method is characterized in that:
the test cylinder power module is connected with one cylinder body serving as a test cylinder in the multi-cylinder engine (M), and the dragging cylinder power module is connected with other cylinder bodies serving as dragging cylinders in the multi-cylinder engine (M);
the power module of the dragging cylinder is connected to the dragging cylinder and comprises the air module (1) and the fuel module (3) which are installed in parallel, namely the power of the multi-cylinder engine (M) is adopted;
the testing cylinder power module is connected to the testing cylinder, comprises a testing cylinder air module (2) and a testing cylinder dual-fuel supply module (6) which are installed in parallel, and provides air and fuel for the testing cylinder; the test cylinder dual-fuel supply module (6) comprises a test cylinder fuel supply module (4) and a test cylinder high-pressure gas fuel supply module (7) which are installed in parallel, and the fuel is provided for the test cylinder; the test cylinder fuel supply module (4) comprises an engine fuel common rail device (402); the test cylinder high-pressure gas fuel supply module (7) comprises a high-pressure gas fuel supply unit (701), a high-pressure gas circuit detection protection unit (702), a high-pressure fuel oil/gas fuel linkage control pressure stabilizing mechanism (703) and an engine test cylinder jet unit (704) which are sequentially connected in series, wherein the engine test cylinder jet unit (704) is connected to the test cylinder; the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism (703) is connected with the engine fuel common rail device (402) and receives real-time pressure conduction of the engine fuel common rail device (402); the data acquisition system acquires the air pressure of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism (703), transmits the air pressure to the engine control system, and transmits a timing and quantitative jet feedback control signal output by the engine control system back to the jet unit (704) of the engine test cylinder; the data acquisition system acquires gas parameter data in the high-pressure gas path detection protection unit (702), transmits the data to the engine control system and is used for judging the state of the gas fuel supply system of the high-pressure test cylinder.
2. The dual-fuel engine single cylinder test platform high pressure gaseous fuel supply system of claim 1, characterized in that: the high-pressure gas fuel supply unit (701) comprises a high-pressure gas fuel source (7011), a high-pressure gas fuel regulation and control integrated device (7012) and a high-pressure gas fuel exhaust integrated device (7013), wherein the high-pressure gas fuel source (7011), the high-pressure gas fuel regulation and control integrated device (7012) is connected to the high-pressure gas circuit detection and protection unit (702), and the tail end of the high-pressure gas fuel exhaust integrated device (7013) is; the high-pressure gas fuel exhaust integrated device (7013) is in bidirectional communication with the high-pressure gas fuel regulation integrated device (7012) and is connected with a loop of the high-pressure fuel/gas fuel linkage control pressure stabilizing mechanism (703).
3. The dual-fuel engine single cylinder test platform high pressure gaseous fuel supply system of claim 1, characterized in that: the high-pressure gas circuit detection protection unit (702) comprises a pneumatic stop valve (7021), a flame arrester (7022) and a gas consumption instrument (7023) which are connected in sequence; the data acquisition system detects and acquires the flow and consumption data of high-pressure gas in the gas consumption instrument (7023) in real time and transmits the data to the engine control system.
4. The dual-fuel engine single cylinder test platform high pressure gaseous fuel supply system of claim 1, characterized in that: the fuel/gas fuel linkage control pressure stabilizing mechanism (703) comprises a plunger (7031), a compression spring (7032) and a spring adjusting knob (7033) which are sequentially connected to a fuel pressure introducing main channel (D); the fuel pressure introducing main passage (D) leads fuel from the fuel common rail device (402); a gas fuel exhaust channel (B) is arranged on the side wall of the fuel pressure introducing main channel (D) at the initial stage of the working stroke of the plunger (7031) and is connected to the high-pressure gas fuel regulation and control integrated device (7012); the middle section of the working stroke of the plunger (7031) is provided with a test cylinder passage (C) for gas fuel to enter and is connected to the engine test cylinder jet unit (704); a gas fuel inlet channel (A) is arranged in the working stroke of the compression spring (7032) and is connected with the gas consumption instrument (7023); the plunger (7031) has a length greater than the maximum distance of the gaseous fuel exhaust passage (B) from the horizontal direction of the gaseous fuel entry test cylinder passage (C).
5. The dual-fuel engine single cylinder test platform high pressure gaseous fuel supply system of claim 1, characterized in that: the engine test cylinder jet unit (704) is a gas fuel jet valve, and the opening and closing time of the gas fuel jet valve is controlled by the engine control system, so that the timing and quantitative control of the gas fuel entering the test cylinder is realized.
6. The dual-fuel engine single cylinder test platform high pressure gaseous fuel supply system of claim 5, characterized in that: the gaseous fuel injection valve is an electromagnetic valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920612498.5U CN210068343U (en) | 2019-04-30 | 2019-04-30 | High-pressure gas fuel supply system for single-cylinder engine test platform of dual-fuel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920612498.5U CN210068343U (en) | 2019-04-30 | 2019-04-30 | High-pressure gas fuel supply system for single-cylinder engine test platform of dual-fuel engine |
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| CN210068343U true CN210068343U (en) | 2020-02-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206661A (en) * | 2019-04-30 | 2019-09-06 | 天津大学 | A kind of dual fuel engine single cylinder engine test platform pressurized fuel gas feed system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206661A (en) * | 2019-04-30 | 2019-09-06 | 天津大学 | A kind of dual fuel engine single cylinder engine test platform pressurized fuel gas feed system |
| CN110206661B (en) * | 2019-04-30 | 2023-07-14 | 天津大学 | High-pressure gas fuel supply system of dual-fuel engine single-cylinder engine test platform |
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