CN111434916A - Simplified testing device suitable for mechanical oil sprayer capacity bullet spraying test - Google Patents
Simplified testing device suitable for mechanical oil sprayer capacity bullet spraying test Download PDFInfo
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- CN111434916A CN111434916A CN201910031476.4A CN201910031476A CN111434916A CN 111434916 A CN111434916 A CN 111434916A CN 201910031476 A CN201910031476 A CN 201910031476A CN 111434916 A CN111434916 A CN 111434916A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000005507 spraying Methods 0.000 title abstract description 32
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000000446 fuel Substances 0.000 claims description 139
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 57
- 239000007789 gas Substances 0.000 description 41
- 238000000034 method Methods 0.000 description 26
- 230000008569 process Effects 0.000 description 25
- 238000002485 combustion reaction Methods 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000000295 fuel oil Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 239000002828 fuel tank Substances 0.000 description 3
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- 238000003384 imaging method Methods 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
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- 239000000178 monomer Substances 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
Abstract
The invention provides a simplified testing device suitable for a mechanical oil sprayer capacitance-bomb spraying test. The testing device comprises an oil tank, a liquid pressurizing device, a pressure accumulator, a switch valve, a constant volume bomb, a mechanical oil sprayer, an air bottle, a high-speed camera and a controller; the pressurizing inlet of the liquid pressurizing device is communicated with the inner space of the oil tank; the accumulator inlet of the accumulator is communicated with the pressurizing outlet of the liquid pressurizing device; the switch valve inlet of the switch valve is communicated with the accumulator outlet of the accumulator; the oil injection inlet of the mechanical oil injector is communicated with the switch valve outlet of the switch valve, and the gas cylinder outlet of the gas cylinder is communicated with the inner space of the constant volume bomb; the controller is respectively and electrically connected with the switch valve and the high-speed camera, the controller controls the switch valve to be opened or closed, and the controller controls the high-speed camera to shoot images in the constant volume bomb. Therefore, the mechanical oil sprayer can finish single injection, and is convenient for a high-speed camera to shoot images; meanwhile, the oil tank, the liquid pressurizing device and the pressure accumulator of the testing device are small in structure and simple in structure.
Description
Technical Field
The present invention relates generally to the field of internal combustion engines, and more particularly to a simplified test apparatus suitable for a mechanical fuel injector capacitance-bomb spray test.
Background
The performance of a diesel engine is closely related to the combustion process in the cylinder, which is related to the mixture formation and the spraying process of the injector. Therefore, studying the spray process of diesel fuel injectors is an important aspect of the study of diesel engines.
The research object of the spraying process of the diesel injector is generally an electric control injector in an electric control diesel engine high-pressure common rail fuel injection system. Because the single injection can be conveniently realized by the electric control oil injector. For a mechanical fuel injector, in order to realize a single injection of the mechanical fuel injector, the following scheme is generally adopted:
specifically, as shown in fig. 1, the testing device includes an oil supply system, an air supply system, and an optical and image acquisition system. The oil supply system comprises an oil tank 11 for storing fuel, an electric motor 18, a flywheel 12, a cam 14, a camshaft 13 for connecting the cam 14 and the flywheel 12, a mechanical single pump 15 for increasing the pressure of the fuel, a two-position three-way electromagnetic valve 16, a mechanical fuel injector 17, a constant volume bomb 24 for simulating the combustion environment in a cylinder of the diesel engine, an Electronic Control Unit (ECU) (electronic control unit)29, and a controller 20 (computer) electrically connected with the two-position three-way electromagnetic valve 16 through the ECU 29. The space of the oil tank 11 for storing fuel oil is communicated with an oil inlet of the mechanical monomer pump 15. An oil inlet of the two-position three-way electromagnetic valve 16 is communicated with an oil outlet of the mechanical unit pump 15. The oil outlet of the two-position three-way electromagnetic valve 16 is respectively communicated with the oil injection inlet of the mechanical oil injector 17 and the space of the oil tank 11 for storing the fuel oil. The motor shaft of the motor 18 is connected to the flywheel 12.
When the oil supply system works, the motor 18 drives the flywheel 12 to rotate at a preset rotating speed, the flywheel 12 enables the cam 14 to rotate through the cam shaft 13, the rotating cam 14 drives the mechanical unit pump 15 to work, and fuel oil in the oil tank 11 enters the mechanical unit pump 15 from an oil inlet of the mechanical unit pump 15. After the pressure of the fuel oil is increased by the mechanical unit pump 15, the high-pressure fuel oil with the increased pressure flows into an oil inlet of the two-position three-way electromagnetic valve 16 from an oil outlet of the mechanical unit pump 15.
When the controller 20 sends a control signal to the ECU29, the ECU29 sends a control current signal to the two-position three-way solenoid valve 16 to control the two-position three-way solenoid valve 16 to communicate the oil outlet of the mechanical monoblock pump 15 and the oil injection inlet of the mechanical oil injector 17. At this time, the mechanical unit pump 15 delivers the high-pressure fuel to the mechanical fuel injector 17 through the two-position three-way electromagnetic valve 16, and the mechanical fuel injector 17 sprays the atomized fuel into the internal space of the constant volume bomb 24.
When the controller 20 does not send a control signal to the ECU29, the ECU29 does not send a control current signal to the two-position three-way solenoid valve 16 to control the two-position three-way solenoid valve 16 to communicate the oil outlet of the mechanical unit pump 15 and the space of the oil tank 11 for storing the fuel. So that high-pressure fuel is returned from the outlet of the mechanical unit pump 15 to the fuel-storing space of the fuel tank 11. Thus, a single spray of the mechanical injector is achieved in response to a control signal from the controller 20.
The gas supply system comprises a gas inlet heating device 25 for heating the gas, a gas inlet valve 26, a gas outlet valve 28 and a gas cylinder 27. The air cylinder 27 communicates with an intake inlet of the intake air heating device 25. An intake valve 26 is provided on a gas passage (an inner space of the pipe) between the intake air heating apparatus 25 and the gas cylinder 27 to control opening and closing of the gas passage between the gas cylinder 27 and the intake air heating apparatus 25. The intake air outlet of the intake air heating device 25 communicates with the internal space of the constant volume bomb 24. During the spraying process, the gas in the gas cylinder 27 enters the inlet air heating device 25 through the inlet valve 26. The temperature value of the gas is adjusted to a preset temperature value in the intake air heating device 25 and then flows into the inner space of the constant volume bomb 24, so that a preset gas pressure and a preset gas temperature are formed in the inner space of the constant volume bomb 24. And then sprayed in the inner space of the constant volume bomb 24 through the mechanical fuel injector 17 to simulate the spraying process of spraying in the inner space of the cylinder of the diesel engine through the mechanical fuel injector 17.
The exhaust valve 28 communicates with the inner space of the constant volume bomb 24 through an exhaust passage. In this way, when the test apparatus simulates the spraying process, after the spraying process of imaging the mechanical fuel injector 17 by the high-speed camera 19 is completed, the exhaust gas in the constant volume bomb 24 is discharged to the internal space of the constant volume bomb 24 through the exhaust valve 28.
The test apparatus further includes a needle lift sensor 21, a pressure sensor 22, a high speed camera 19, and an optical system 23. The high-speed camera 19 and the optical system 23 constitute an optical and image acquisition system. The optical system 23 forms an optical environment suitable for the photographing needs of the high-speed camera 19 in the internal space of the constant volume bomb 24. The needle lift sensor 21 may be a displacement sensor, and the needle lift sensor 21 is provided on a needle of the mechanical injector 17 to detect a stroke of the needle of the mechanical injector 17. A pressure sensor 22 is provided at the fuel injection inlet of the mechanical fuel injector 17 to detect the fuel pressure at the fuel injection inlet of the mechanical fuel injector 17. The needle lift sensor 21 and the pressure sensor 22 are electrically connected to the controller 20. The controller 20 is electrically connected to the high-speed camera 19.
In the process of simulating spraying, the controller 20 sends a control signal to the ECU, and the ECU sends a control current signal to the two-position three-way electromagnetic valve 16 to control the two-position three-way electromagnetic valve 16 to communicate the oil outlet of the mechanical monoblock pump 15 and the oil injection inlet of the mechanical oil injector 17. In this way, the fuel is injected into the internal space of the constant volume bomb 24 by the mechanical injector 17. Meanwhile, the controller receives and displays detection result signals through the needle valve lift sensor 21 and the pressure sensor 22. The detection result signals are a measurement signal of the needle lift sensor 21 and a measurement signal of the pressure sensor 22. While the controller 20 sends a control signal to the ECU, the controller 20 controls the high-speed camera 19 to take an image in the internal space of the constant volume bomb 24, and the controller 20 receives and records the image signal of the high-speed camera 19.
After the simulated spraying process is finished, the controller 20 does not send a control signal to the ECU, and the ECU does not send a control current signal to the two-position three-way electromagnetic valve 16, so as to control the two-position three-way electromagnetic valve 16 to communicate the oil outlet of the mechanical unit pump 15 and the space of the oil tank 11 for storing the fuel oil. Meanwhile, the controller 20 controls the high-speed camera 19 to stop operating after a preset time period.
In the first scheme, the mechanical unit pump 15 of the oil supply system is driven by the motor 18, the flywheel 12 and the cam 14. The motor 18, the flywheel 12 and the cam 14 are large in size, and the oil supply system is complicated in structure.
And in the second scheme, a plunger pump is adopted, so that an oil outlet of the plunger pump is directly communicated with an oil injection inlet of the mechanical oil injector. The manual power is provided to drive the plunger pump to work so as to provide pressure fuel oil for the mechanical fuel injector, and then single spraying is realized. In the second scheme, the oil inlet pressure of the mechanical oil sprayer is low, the oil spraying amount is small, and the spraying is incomplete, so that the image signal shot by the high-speed camera 19 cannot accurately reflect the spraying process of the current mechanical oil sprayer in the cylinder of the internal combustion engine.
Accordingly, there is a need to provide a simplified test apparatus suitable for mechanical fuel injector capacitance-spray testing that at least partially addresses the above-mentioned problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description section. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to at least partially solve the technical problem, the invention provides a simplified testing device suitable for a mechanical fuel injector bomb spray test, which comprises: an oil tank; the pressurizing inlet of the liquid pressurizing device is communicated with the inner space of the oil tank; the pressure accumulator, the pressure accumulator inlet of the pressure accumulator communicates with pressurization outlet of the liquid pressurization device; the switch valve inlet of the switch valve is communicated with the accumulator outlet of the accumulator; performing constant volume bomb making; the mechanical oil sprayer is connected with the constant volume bomb, and the oil spraying outlet of the mechanical oil sprayer is arranged in the inner space of the constant volume bomb; the gas cylinder outlet of the gas cylinder is communicated with the inner space of the constant volume bomb; the high-speed camera and the controller are respectively electrically connected with the switch valve and the high-speed camera, the controller controls the switch valve to be opened or closed, and the controller controls the high-speed camera to shoot images in the constant volume bomb.
According to the testing device of the embodiment, the controller controls the opening or closing of the switch valve, so that the mechanical oil sprayer can finish single-time spraying, and the high-speed camera can conveniently shoot the image of the spraying of the mechanical oil sprayer to the inner space of the constant volume bomb. Meanwhile, the oil tank, the liquid pressurizing device and the pressure accumulator of the testing device are small in structure, and the testing device is simple in structure.
Optionally, the testing device further comprises a filter disposed on the conduit between the tank and the pressurized inlet.
Optionally, the testing device further comprises a pressure testing device connected to the accumulator for measuring the pressure of the fluid in the accumulator.
Optionally, the testing device further comprises a pressure sensor, a displacement sensor and an oscilloscope, the pressure sensor is arranged at the oil injection inlet of the mechanical oil injector, the displacement sensor is arranged on a needle valve of the mechanical oil injector, the oscilloscope is respectively and electrically connected with the pressure sensor, the displacement sensor and the controller, and the oscilloscope of the controller records the measurement signals of the pressure sensor and the displacement sensor.
Optionally, the testing device further comprises an optical system for forming a preset optical environment in the inner space of the constant volume bomb.
Optionally, the switching valve comprises: the valve body comprises a cavity, an inlet channel communicated with the inlet of the switch valve and a discharge channel communicated with the outlet of the switch valve, the cavity comprises a first cavity and a second cavity, the first cavity is communicated with the inlet channel through the inlet of the first cavity and is provided with a first cavity outlet, and the second cavity is communicated with the inlet channel through the inlet of the second cavity; the valve core is arranged in the cavity, the first cavity and the second cavity are respectively positioned at two ends of the valve core, and the valve core can move between a first position and a second position in the cavity, wherein in the first position, the discharge channel is communicated with the second cavity through the outlet of the second cavity, and in the second position, the valve core blocks the outlet of the second cavity to close the discharge channel; a first elastic member for applying a force to the spool to move it from the first position to the second position; and the switch structure is used for opening or closing the outlet of the first cavity.
Alternatively, the pressure of the accumulator storing the fuel is 40 to 200 MPa.
Optionally, the controller controls the switching structure such that the on-duration of the switching valve is 2ms to 6 ms.
Optionally, the testing device further comprises an air inlet heating device, an air inlet of the air inlet heating device is communicated with an air bottle outlet of the air bottle, and an air inlet of the air inlet heating device is communicated with the inner space of the constant volume bomb.
Optionally, the testing device further comprises an air inlet valve and an air outlet valve, the air inlet valve is arranged on a channel between the air bottle outlet and the air inlet, and the air outlet valve is communicated with the inner space of the constant volume bomb through the air outlet channel.
Drawings
In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.
FIG. 1 is a schematic diagram of a testing apparatus according to a first prior art solution;
FIG. 2 is a schematic view of a testing device according to a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional schematic view of the on-off valve of FIG. 2 (with the on-off valve in a closed state);
FIG. 4 is an enlarged view of a portion of FIG. 3; and
fig. 5 is a schematic sectional view of the on-off valve of fig. 2 (in which the on-off valve is in an open state).
Description of reference numerals:
11/111: oil tank 12: flywheel wheel
13: camshaft 14: cam wheel
15: mechanical unit pump 16: two-position three-way electromagnetic valve
17/117: the mechanical fuel injector 18: electric motor
19/119: high-speed camera 20/120: controller
21/121: needle lift sensor 22/122: pressure sensor
23/123: optical system 24/124: constant volume bomb
25/125: intake air heating device 26/126: air inlet valve
27/127: gas cylinder 28/128: air exhaust valve
29/116: the ECU 112: filter
113: liquid pressurizing device 114: pressure accumulator
115: pressure measurement device 118: oscilloscope
200: the on-off valve 210: valve body
211: cavity 212: access channel
213: discharge passage 214: the first cavity
215: second cavity 216: low pressure drain
217: the electromagnetic cavity 218: outlet of switch valve
219: switching valve inlet 220: valve core
230: first elastic member 240: electromagnetic ball valve
241: steel ball 242: armature iron
243: electromagnetic coil 244: second elastic member
250: third cavity 260: low pressure channel
270: second chamber outlet 280: inlet of the first chamber
290: first chamber outlet 300: temperature sensor
310: second chamber inlet 320: first inlet channel
330: second inlet channel
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The invention provides a simplified testing device suitable for a mechanical oil sprayer capacitance-bomb spraying test. The simplified test device for the capacity bomb spraying test of the mechanical oil sprayer comprises an oil supply system and an air supply system. As shown in fig. 2, the oil supply system includes a tank 111 for storing fuel, a filter 112 for filtering out impurities in the fuel, a liquid pressurizing device 113 for increasing the pressure of the fuel, an accumulator 114 for storing high-pressure fuel, an on-off valve 200, a mechanical fuel injector 117, a constant volume bomb 124 for simulating a combustion environment in a cylinder of a diesel engine, a controller 120, and a high speed camera 119.
The internal space of the fuel tank 111 is communicated with the filter inlet of the filter 112 through a pipeline, the fuel in the fuel tank 111 enters the filter 112 through the pipeline, and the fuel is filtered by the filter 112 to remove impurities in the fuel.
The liquid pressurizing device 113 is a pneumatic liquid booster or an electric liquid booster. The filter outlet of the filter 112 and the pressurizing inlet of the liquid pressurizing means 113 are communicated through a pipe, so that the fuel filtered by the filter 112 enters the liquid pressurizing means 113, and the liquid pressurizing means 113 increases the pressure of the fuel by a preset pressure.
The pressurizing outlet of the liquid pressurizing device 113 and the accumulator inlet of the accumulator 114 are communicated through a pipe, and the fuel with increased pressure enters and is stored in the accumulator 114. The accumulator 114 thus stores fuel at a pressure value of a preset pressure. Preferably, the accumulator 114 stores fuel at a pressure of 40 to 200 MPa.
In this embodiment, the testing device further includes a pressure measuring device 115. The pressure measuring device 115 may be a pressure gauge. The pressure measuring device 115 is used to measure the pressure of the fuel in the accumulator 114. This facilitates the acquisition of the pressure value of the fuel in the accumulator 114.
In the present embodiment, the on-off valve 200 is a solenoid valve. The testing device also includes an ECU 116. The controller 120 is electrically connected to the ECU116, and the ECU116 is electrically connected to the on-off valve 200. The controller 120 sends a control signal to the ECU116, and the ECU116 sends a control current signal to the solenoid 243 of the on-off valve 200, thereby controlling the on or off of the on-off valve 200.
Specifically, as shown in fig. 3 to 5, the on-off valve 200 of the present embodiment includes a valve body 210. The valve body 210 includes a cavity 211, an inlet passage 212, an on-off valve inlet 219 communicating with the inlet passage 212, an outlet passage 213, and an on-off valve outlet 218 communicating with the outlet passage 213. Both the inlet passage 212 and the outlet passage 213 communicate with the cavity 211. This allows fuel to be injected into the chamber 211 through the inlet passage 212. The fuel in the cavity 211 may be discharged out of the cavity 211 through the discharge passage 213.
In this embodiment, the cavity 211 includes a first cavity 214 and a second cavity 215. As shown in fig. 3, the cavity 211 extends in the up-down direction, and the first cavity 214 and the second cavity 215 are respectively located at both ends of the cavity 211. Specifically, the first cavity 214 is located at an upper end of the cavity 211, and the second cavity 215 is located at a lower end of the cavity 211. Of course, the cavity 211 may also extend in the left-right direction or other directions, and those skilled in the art can arrange the cavity as required.
In the present embodiment, as shown in fig. 3 to 5, the first cavity 214 is provided with a first cavity inlet 280 and a first cavity outlet 290. The first chamber inlet 280 and the first chamber outlet 290 are both round ports. The diameter of the first chamber inlet 280 is smaller than the diameter of the first chamber outlet 290. The first cavity 214 communicates into the channel 212 through the first cavity inlet 280. The first chamber outlet 290 communicates with a low-pressure environment (an environment having a pressure lower than the pressure in the flow path in which the on-off valve 200 is located) through the solenoid chamber 217 and the low-pressure discharge port 216. Thus, high pressure fuel may enter the first cavity 214 from the inlet passage 212. And when the solenoid ball valve 240 opens the first chamber outlet 290, the first chamber outlet 290 communicates with the low pressure environment through the solenoid chamber 217 and the low pressure drain 216. Thus, fuel within the first cavity 214 exits the first cavity 214 through the first cavity outlet 290, and the flow of fuel from the inlet passage 212 into the first cavity 214 through the first cavity inlet 280 is less than the flow of fuel from the first cavity into the low pressure environment through the first cavity outlet 290. Therefore, a high pressure environment cannot be formed in the first cavity 214. The electromagnetic ball valve 240, the electromagnetic cavity 217 and the low pressure discharge port 216 will be described later.
In this embodiment, as shown in fig. 4, the second cavity 215 has a second cavity inlet 310 and a second cavity outlet 270. The second chamber inlet 310 and the second chamber outlet 270 are round ports. The second cavity 215 communicates with the inlet passage 212 through a second cavity inlet 310. When the spool 220 is in the first position, the second chamber 215 communicates with the drain passage 213 through the second chamber outlet 270. Thus, fuel may pass from the inlet passage 212, through the second inlet passage 330, and into the second chamber 215, and fuel within the second chamber 215 may exit the valve body 210 through the outlet passage. The spool 220, the first position of the spool 220, and the second inlet passage 330 will be described later.
Specifically, as shown in fig. 3, the inlet passage 212 includes a first inlet passage 320 and a second inlet passage 330. The first inlet passage 320 communicates with the first chamber 214 through the first chamber inlet 280. The second inlet passage 330 communicates with the second chamber 215 through the second chamber inlet 310.
In the present embodiment, as shown in fig. 3, the switching valve 200 further includes a valve body 220, and the valve body 220 has a columnar structure. Specifically, the valve core 220 has a cylindrical structure. The valve core 220 is disposed in the cavity 211, and a height direction of the valve core 220 and an extension direction of the cavity 211 are substantially the same. In the cavity 211, the first cavity 214 is located at one end of the spool 220, and the second cavity 215 is located at the other end of the spool 220. Specifically, the first cavity 214 is located at an upper end of the spool 220, and the second cavity 215 is located at a lower end of the spool 220. Thus, the spool 220 separates the first and second chambers 214 and 215 into two chambers that are not communicated with each other. One end of the spool 220 contacts the fuel in the first chamber 214 while the other end of the spool 220 contacts the fuel in the second chamber 215.
In the present embodiment, the spool 220 is movably disposed within the cavity 211 between a first position and a second position. Wherein in the first position the discharge passage 213 communicates with the second cavity 215 through the second cavity outlet 270. In the second position, the valve spool 220 blocks the second chamber outlet 270 to close the second chamber outlet 270 and the drain passage 213. Specifically, the spool 220 is movably disposed in an extending direction of the cavity 211 to be switched between a first position and a second position. Thus, when the spool 220 moves to the first position, fuel within the second chamber 215 exits the second chamber 215 from the drain passage 213 via the second chamber outlet 270. When the valve spool 220 moves to the second position, the valve spool 220 blocks the second chamber outlet 270 to close the second chamber outlet 270 and the drain passage 213, and the fuel in the second chamber 215 cannot be discharged from the drain passage 213 through the second chamber outlet 270.
In the present embodiment, as shown in fig. 3, when the first chamber outlet 290 is closed by the electromagnetic ball valve 240 and the spool 220 is at the second position, the pressure of the fuel in the first chamber 214 is the same as the pressure of the fuel in the second chamber 215. Thus, the acting force of the fuel in the first cavity 214 on the valve core 220, the acting force of the fuel in the second cavity 215 on the valve core 220, and the resultant force of the acting force of the first elastic member 230 on the valve core 220 are directed downward in the up-down direction of fig. 3, so that the valve core 220 is located at the second position, and the valve core 220 is pressed to close the second cavity outlet 270, that is, the valve core 220 blocks the second cavity outlet 270, and the on-off valve 200 is in the closed state.
When the on-off valve 200 is in the closed state, when the electromagnetic ball valve 240 opens the first chamber outlet 290, the fuel in the first chamber 214 is discharged to the low pressure environment through the first chamber outlet 290, because the flow rate of the fuel flowing into the first chamber 214 from the first inlet passage 320 through the first chamber inlet 280 is smaller than the flow rate of the fuel flowing into the low pressure environment from the first chamber 214 through the first chamber outlet 290. Therefore, a high pressure environment cannot be formed in the first chamber 214, and the pressure of the fuel in the first chamber 214 is lower than the pressure of the fuel in the second chamber 215. In this way, the force applied to the valve element 220 by the fuel in the first cavity 214 is smaller than the force applied to the valve element 220 by the fuel in the second cavity 215, and the direction of the force applied to the valve element 220 by the fuel in the first cavity 214 is opposite to the direction of the force applied to the valve element 220 by the fuel in the second cavity 215. Thus, the combined force of the fuel in the first cavity 214 and the fuel in the second cavity 215 acting on the valve element 220 overcomes the elastic force of the first elastic member 230, and the valve element 220 moves from the second position to the first position, so that the discharge passage 213 communicates with the second cavity 215, and the fuel in the second cavity 215 is discharged from the discharge passage 213 to the second cavity 215. The on-off valve 200 is in an open state at this time. The first elastic member 230 will be described later.
Preferably, the lower end surface of the valve element 220 is a first tapered surface. Thus, the first tapered surface is in line contact with the second chamber outlet 270, which allows for the greatest possible blockage of the second chamber outlet 270.
Preferably, the valve core 220 further comprises a second taper surface, and the second taper surface and the second cavity inlet 310 are located at the same height along the extending direction of the cavity 211. In this way, the upward directed force exerted by the fuel in the second chamber 215 on the spool 220 is evenly distributed over the second conical surface.
In the present embodiment, the switching valve further includes a first elastic member 230 for applying a force to the spool 220, which enables the spool 220 to move from the first position to the second position. Specifically, the cavity 211 of the valve body 210 further includes a third cavity 250. The third cavity 250 is located between the first cavity 214 and the second cavity 215. The first elastic member 230 is disposed in the third cavity 250, and the valve element 220 is disposed through the third cavity 250. One end of the first elastic member 230 is connected to an inner wall surface of the third chamber 250, and the other end of the first elastic member 230 is connected to the valve element 220 to apply a downward force to the valve element 220. Preferably, the first elastic member 230 is a cylindrical spring.
Preferably, the valve body 210 further includes a low pressure passage 260. The third chamber 250 is communicated with the low-pressure exhaust port 216 through the low-pressure passage 260 and the electromagnetic chamber 217.
In this embodiment, when the switch structure opens the first chamber outlet 290, the fuel in the first chamber 214 flows through the first chamber outlet 290 and the solenoid chamber 217 in sequence, and flows out of the solenoid chamber 217 from the low pressure outlet 216, and at this time, the valve element 220 moves from the second position to the first position. During movement of the valve spool 220 from the second position to the first position, the movement of the valve spool 220 may decrease the volume of the third cavity 250. At this time, since the low pressure passage 260 communicates with the solenoid chamber 217, the fuel in the third chamber 250 can flow into the solenoid chamber 217 through the low pressure passage 260 and then flow out of the solenoid chamber 217 from the low pressure exhaust port 216. In this way, an increase in pressure of the fuel within the third chamber 250 can be avoided, thereby preventing the fuel within the third chamber 250 from resisting movement of the valve spool 220.
In this embodiment, when the switch structure closes the first chamber outlet 290, the valve element 220 moves from the first position to the second position. During movement of the valve element 220 from the first position to the second position, the movement of the valve element 220 increases the volume of the third chamber 250. At this time, the pressure of the fuel in the third chamber 250 is reduced, and the low-pressure fuel in the solenoid chamber 217 flows into the third chamber 250 through the low-pressure passage 260. At this time, the fuel in the third chamber 250 is always in a low pressure state, and therefore the fuel in the third chamber 250 does not resist the movement of the valve spool 220.
The on-off valve 200 of the present embodiment further includes an on-off structure for opening or closing the first chamber outlet 290. The ECU116 is electrically connected to the switch structure. The controller 120 sends a control signal to the ECU116, and then the ECU116 sends a control current signal to the switch structure to control the switch structure to open or close the first chamber outlet 290. Preferably, the switch is configured as an electromagnetic ball valve 240, that is, the electromagnetic ball valve 240 may be electrically connected to the controller 120 through the ECU116, and the controller 120 sends a control signal to the ECU116, so that the ECU116 sends a control current signal to the electromagnetic ball valve 240 to control the electromagnetic ball valve 240 to open or close the first chamber outlet 290.
According to the switching valve 200 of the present embodiment, when the electromagnetic ball valve 240 closes the first cavity outlet 290, the switching valve 200 is in a closed state; when the electromagnetic ball valve 240 opens the first chamber outlet 290, the on-off valve 200 is in an open state. And the opening and closing of the electromagnetic ball valve 240 is not affected by the pressure of the fuel in the on-off valve 200, so that the operation of opening or closing the on-off valve 200 is not affected by the pressure of the fuel in the on-off valve 200, and thus the on-off valve 200 can be used in a fuel system having a high fuel pressure. Since the opening and closing of the electromagnetic ball valve 240 is not affected by the pressure of the fuel in the on-off valve 200, the electromagnetic ball valve 240 can complete the opening or closing of the first chamber outlet 290 in a short time, that is, the on-off valve 200 can complete the opening or closing in a short time. And the interval period (on duration) in which the on-off valve 200 is switched between the open state and the closed state is short. That is, the switching valve of the present embodiment has a wide operating pressure range (40 to 200MPa), and can be applied to a hydraulic system having a high fuel pressure (160 MPa). And when the fuel pressure is high (160MPa), the controller 120 transmits a control signal to the ECU116, and then the ECU116 transmits a control current signal to the switching valve 200 to control the opening or closing of the switching valve 200, so that the opening duration of the switching valve 200 can be controlled between 2ms and 6ms, i.e., the opening duration of the switching valve 200 can be precisely controlled according to the control signal of the controller 120. Meanwhile, since the on-off valve 200 can be applied to a hydraulic system having a high fuel pressure (160MPa), the flow rate of the on-off valve 200 is large, and the single injection amount of the mechanical injector 117 using the on-off valve 200 is large. The controller 120 will be described later.
In this embodiment, the valve body 210 further includes an electromagnetic cavity 217 for accommodating the electromagnetic ball valve 240 and a low pressure discharge port 216. The solenoid chamber 217 communicates with the first chamber 214 through a first chamber outlet 290. The low pressure exhaust port 216 communicates between the solenoid chamber 217 and the low pressure environment. Thus, when the solenoid ball valve 240 opens the first chamber outlet 290, the first chamber 214 communicates with the low pressure exhaust port 216 via the first chamber outlet 290, the solenoid chamber 217, and the low pressure environment. In this embodiment, the electromagnetic ball valve 240 includes a blocking member, an armature 242, an electromagnetic coil 243, and a second elastic member 244.
The obstruction serves to open or close the first chamber outlet 290. Preferably, the obstruction is a steel ball 241. In this embodiment, the first cavity outlet 290 is a round opening, when the steel ball 241 closes the first cavity outlet 290, the steel ball 241 is pressed against the first cavity outlet 290, and at this time, the contact between the steel ball 241 and the first cavity outlet 290 is a line contact. The line contact enables the steel ball 241 to completely close the first chamber outlet 290 and prevent the fuel in the first chamber 214 from flowing from the first chamber outlet 290 into the solenoid chamber 217. Therefore, the pressure of the fuel in the first chamber 214 and the pressure of the fuel in the second chamber 215 can be the same, and the switching valve 200 is in a closed state by ensuring that the valve element 220 is in the second position due to the force of the first elastic member 230 on the valve element 220.
An armature 242 is connected to the steel ball 241, and the armature 242 is movably disposed to drive the steel ball 241 to open or close the first chamber outlet 290.
In this embodiment, the electromagnetic coil 243 is used to generate a magnetic field to drive the armature 242 to move. Specifically, the electromagnetic coil 243 is electrically connected to the ECU116 through a power cord. The controller 120 sends a control signal to the ECU116, and then the ECU116 sends a control current signal to the electromagnetic coil 243 to control the current applied to the electromagnetic coil 243, so as to control the magnetic field generated by the electromagnetic coil 243 and thus the movement of the armature 242.
The second resilient member 244 is used to apply a second compressive force to the armature 242 that allows the steel ball 241 to compress the first chamber outlet 290. Specifically, one end of the second elastic member 244 is connected to the inner wall of the electromagnetic cavity 217, and the other end of the second elastic member 244 is connected to the armature 242 to apply a second pressing force to the armature 242 so that the steel ball 241 can press the first cavity outlet 290. Preferably, the second elastic member 244 is a cylindrical spring.
The operation process of the on-off valve 200 of the present embodiment is:
the initial state of the on-off valve is closed as shown in fig. 3, the controller 120 sends no control signal to the ECU116, the ECU116 sends no control current signal to the solenoid 243, so that no current passes through the solenoid 243, the steel ball closes the first chamber outlet 290, and the valve element 220 is in the second position, where fuel is blocked in the chamber 211.
When the switching valve 200 is opened, the controller 120 sends a control signal to the ECU116, and the ECU116 sends a control current signal to the electromagnetic coil 243 to control the current passing through the electromagnetic coil 243, at which time the electromagnetic coil 243 generates a magnetic field, and the acting force of the magnetic field on the armature 242 overcomes the second pressing force of the second elastic member 244 on the armature 242. So that the armature 242 moves the steel ball 241 upward. So that the steel ball 241 opens the first chamber outlet 290. At this time, the fuel in the first chamber 214 flows into the solenoid chamber 217 through the first chamber outlet 290. So that a high pressure environment cannot be established in the first chamber 214, the pressure of the fuel in the first chamber 214 is lower than the pressure of the fuel in the second chamber 215. Therefore, the acting force of the fuel in the first chamber 214 on the valve core 220 is smaller than the resultant force of the acting force of the fuel in the second chamber 215 on the valve core 220 and the elastic force of the first elastic member 230. The spool 220 is subjected to a resultant force directed upward. Thus, the valve element 220 overcomes the elastic force of the first elastic member 230 to move from the second position to the first position, and the valve element 220 opens the second chamber outlet 270. At this time, the second chamber 215 communicates with the discharge passage 213 through the second chamber outlet 270, and as shown in fig. 5, the fuel in the second chamber 215 is discharged out of the valve body through the discharge passage 213 through the second chamber outlet 270. In the process, the fuel in the first chamber 214 passes through the first chamber outlet 290, passes through the solenoid chamber 217, and is discharged out of the valve body from the low pressure discharge port 216.
When it is necessary to close the on-off valve 200, the controller 120 does not send a control signal to the ECU116, the ECU116 does not send a control current signal to the solenoid 243, and no current flows in the solenoid 243. The armature 242 is not subjected to the magnetic force of the electromagnetic coil 243. Since the armature 242 is acted upon by the elastic force of the second elastic member 244, the armature 242 moves downward, and the armature 242 closes (blocks) the steel ball 241 from the first chamber outlet 290. The fuel enters the first chamber 214 through the inlet passage 212 and the first chamber inlet 280, and the fuel enters the second chamber 215 through the inlet passage 212 and the second chamber inlet 310. Thus, the pressure of the fuel in the first chamber 214 is equal to the pressure of the fuel in the second chamber 215, the acting force of the fuel in the first chamber 214 on the valve element 220, the acting force of the fuel in the second chamber 215 on the valve element 220, and the resultant force of the acting force of the first elastic member 230 on the valve element 220 are directed downwards, so that the valve element 220 is located at the second position, and the valve element 220 is pressed to close the second chamber outlet 270, that is, the valve element 220 blocks the second chamber outlet 270, and the switching valve 200 is in the closed state. As shown in fig. 3, the high pressure fuel is now trapped in the second chamber 215.
In the present embodiment, the operating pressure of the on-off valve 200 is high, and therefore, the spray pressure of the mechanical injector 117 (the fuel pressure value at the injection inlet of the mechanical injector 117) can be controlled within a wide pressure range. Further, the mechanical injector 117 stabilizes the spray pressure of the mechanical injector 117 (stabilizes the pressure at the injection inlet of the mechanical injector 117) by the action of the accumulator 114 under different spray pressures, and further, the single injection amount of the mechanical injector 117 is made large, and the spraying process of the mechanical injector 117 is stabilized. Thus, when the mechanical fuel injector 117 is spraying, the high-speed camera 119 can capture high frame rate images of the spraying process. And because the on-off valve 200 can be opened or closed quickly when the working pressure is high, the controller 120 can precisely control the opening duration of the on-off valve 200 through the ECU116 according to specific requirements, and further control the duration of the oil injection duration of the mechanical oil injector 117 (the duration of a single spray of the mechanical oil injector 117); meanwhile, the opening duration of the on-off valve 200 can be controlled in a short time, and the fuel injection quantity of the mechanical fuel injector 117 and the single spray of the corresponding mechanical fuel injector 117 can be accurately controlled.
In the present embodiment, the discharge passage 213 of the on-off valve 200 and the injection inlet of the mechanical injector 117 communicate with each other through a pipe. The mechanical fuel injector 117 penetrates through the constant volume bomb 124, and the mechanical fuel injector 117 is hermetically connected with the constant volume bomb 124 so as to prevent gas in the constant volume bomb 124 from leaking to the outside from a gap between the mechanical fuel injector 117 and the constant volume bomb 124. The injection outlet of the mechanical injector 117 is located in the inner space of the constant volume bomb 124. In this way, the on-off valve 200 is opened, and the high-pressure fuel in the accumulator 114 is introduced into the mechanical injector 117 through the on-off valve 200, and then the mechanical injector 117 sprays the atomized fuel (spray) into the combustion space of the constant volume bomb 124. With the on-off valve 200 in the closed state, the high-pressure fuel in the accumulator 114 is prevented from entering the mechanical fuel injector 117.
In the present embodiment, the controller 120 controls the opening and closing of the on-off valve 200 by the ECU116 to allow the mechanical injector 117 to complete a single injection. The high-speed camera 119 is convenient to take an image of the spray of the mechanical fuel injector 117 to the internal space of the constant volume bomb 124 (the high-speed camera 119 takes a high frame rate image of the internal space of the constant volume bomb 124). Since the test apparatus has a small structure of the oil tank 111, the liquid pressurizing device 113, and the accumulator 114, the test apparatus of the present embodiment has a simpler structure as compared with the conventional test apparatus shown in fig. 1.
In the present embodiment, as shown in fig. 2, the gas supply system includes an intake air heating device 125 for heating gas, an intake valve 126, an exhaust valve 128, and a gas cylinder 127.
The outlet of the gas cylinder 127 is communicated with the inlet of the inlet heating device 125 through the inlet valve 126, and the inlet heating device 125 is communicated with the inner space of the constant volume bomb 124 through a pipeline. Thus, the gas in the gas cylinder 127 enters the intake air heating apparatus 125 through the intake valve 126. The temperature value of the gas is adjusted to a predetermined temperature value in the intake air heating device 125 and then flows into the inner space of the constant volume bomb 124. This allows the pressure of the gas within the interior space of the constant volume bomb 124 to be at the predetermined gas pressure and the temperature of the gas within the interior space of the constant volume bomb 124 to be at the predetermined gas temperature. And then sprayed by the mechanical injector 117 in the inner space of the constant volume bomb 124 to simulate a spraying process of spraying by the mechanical injector 117 in the inner space of the cylinder of the diesel engine and a combustion process of the atomized fuel sprayed by the mechanical injector 117 in the inner space of the cylinder of the diesel engine.
In the present embodiment, the exhaust valve 128 communicates with the internal space of the constant volume bomb 124 through a pipe. In this way, when the test apparatus simulates the spraying process, after the spraying process of imaging the mechanical fuel injector 117 by the high-speed camera 119 is completed, the exhaust gas in the constant volume bomb 124 is discharged to the internal space of the constant volume bomb 124 through the exhaust valve 128. And in the test device simulation combustion process, after the combustion process of the atomized fuel in the constant volume bomb 124 is finished through the high-speed camera 119, the waste gas in the constant volume bomb 124 is discharged out of the inner space of the constant volume bomb 124 through the exhaust valve 128.
The testing apparatus of the present embodiment can simulate, in the internal space of the constant volume bomb 124, the spraying process of the mist sprayed by the mechanical injector 117 in the internal space of the cylinder of the diesel engine, and the combustion process of the mist fuel sprayed by the mechanical injector 117 in the internal space of the cylinder of the diesel engine. The spray and combustion processes are then captured by a high speed camera 119 at a high frame rate, enabling them to be viewed.
In the test device of the embodiment, when simulating the spraying process, in the process of injecting the fuel oil into the constant volume bomb 124 by the mechanical fuel injector 117, nitrogen gas needs to be filled into the constant volume bomb 124, or other gas which does not support combustion needs to be filled. The high frame rate image acquisition is then performed by the high speed camera 119 on the spray process of the mechanical fuel injector 117. After the acquisition of the high frame rate image is completed, the exhaust gas in the internal space of the constant volume bomb 124 is exhausted out of the internal space of the constant volume bomb 124 through the exhaust valve 128.
After simulating the spray process, if the combustion process is to be simulated. In the simulated combustion process, in the process of injecting fuel into the constant volume bomb 124 by the mechanical fuel injector 117, oxygen or a mixture gas containing oxidation property needs to be filled into the constant volume bomb 124. Then, a high-speed camera 119 is used to acquire a high-frame-rate image of the combustion process of the atomized fuel in the constant volume bomb 124. After the acquisition of the high frame rate image is completed, the burned exhaust gas in the internal space of the constant volume bomb 124 is discharged out of the internal space of the constant volume bomb 124 through the exhaust valve 128.
The testing device of the embodiment can adjust the inflation volume (the volume of the gas entering the inner space of the constant volume bomb 124) and the inflation temperature according to specific conditions, so that the temperature value of the inner space of the constant volume bomb 124 reaches a preset temperature value, and the pressure value of the inner space of the constant volume bomb 124 reaches a preset pressure value, and thus the spraying process and the combustion process can be simulated through the testing device
In this embodiment, the shape of the constant volume bomb 124 can be square, spherical or cylindrical, and those skilled in the art can configure the bomb as required.
In this embodiment, the testing apparatus further includes a needle lift sensor 121, a pressure sensor 122, an oscilloscope 118, and an optical system 123. The optical system 123 forms an optical environment suitable for the photographing needs of the high-speed camera 119 in the combustion space of the constant volume bomb 124. The needle lift sensor 121 may be a displacement sensor, and the needle lift sensor 121 is provided on a needle of the mechanical fuel injector 117 to detect a stroke of the needle of the mechanical fuel injector 117. A pressure sensor 122 is provided at the fuel injection inlet of the mechanical fuel injector 117 to detect the fuel pressure at the fuel injection inlet of the mechanical fuel injector 117. The needle lift sensor 121 and the pressure sensor 122 are electrically connected to the oscilloscope 118. The controller 120 is electrically connected to the oscilloscope 118 and the high-speed camera 119, respectively. The oscilloscope 118 receives and displays the detection result signal. The detection result signals are a measurement signal of the needle lift sensor 121 and a measurement signal of the pressure sensor 122. The oscilloscope 118 transmits a detection result signal to the controller 120, and the controller 120 controls the high-speed camera 119 to photograph an image in the combustion chamber of the constant volume bomb 124. And the controller 120 receives and records the image signal of the high-speed camera 119.
In the present embodiment, the temperature sensor 300 and the pressure sensor 122 are also provided in the internal space of the constant volume bomb 124. The temperature sensor 300 inside the constant volume bomb 124 is used to measure the temperature of the gas inside the constant volume bomb 124. The pressure sensor 122 within the constant volume bomb 124 is used to measure the pressure of the gas within the constant volume bomb 124. The temperature sensor 300 and the pressure sensor 122 in the constant volume bomb 124 are both electrically connected with the controller 120 to deliver the temperature of the gas and the pressure of the gas in the constant volume bomb 124 to the controller 120.
In this embodiment, the oscilloscope 118 includes a current clamp. The current clamp is used to clamp the wires between the ECU116 and the on-off valve 200. During the simulation of the spray process and the combustion process by the test apparatus, the oscilloscope 118 records the measurement signal of the pressure sensor 122 and the measurement signal of the needle lift sensor 121. Specifically, the controller 120 sends a control signal to the ECU116, and the ECU116 sends a control current signal to the on-off valve 200 to control the on-off valve 200 to open so as to enable the mechanical fuel injector 117 to perform a single injection into the inner space of the constant volume bomb 124. The current clamp measures the control current signal to the ECU116 at the same time as the control current signal sent by the ECU116 to the on-off valve 200. The current clamp sends a voltage signal to the oscilloscope 118 according to the control current signal. The voltage signal triggers the oscilloscope 118 to operate to record the measurement signal of the pressure sensor 122 and the measurement signal of the needle lift sensor 121. The oscilloscope 118 transmits the recorded test signal to the controller 120. The controller 120 synchronously controls the high-speed camera to photograph the image in the constant volume bomb 124 during the spraying of the mechanical injector 117 and during the burning of the atomized fuel in the internal space of the constant volume bomb 124.
In other embodiments, the optical system 123 may form an optical environment suitable for the photographing requirement of the high-speed camera 119 in the internal space of the constant volume bomb 124 by a schlieren method or a laser test method.
Preferably, the tank 111, the filter 112 and the liquid pressurizing means 113 may be integrated in one fuel pressurizing means module, wherein the pressure measuring means is arranged on the liquid pressurizing means 113. This makes the tank 111, the filter 112, and the liquid pressurizing device 113 modular, thereby further simplifying the structure of the test apparatus.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A simplified test apparatus adapted for use in a mechanical fuel injector bomb spray test, the test apparatus comprising:
an oil tank;
a liquid pressurizing device, a pressurizing inlet of the liquid pressurizing device is communicated with the inner space of the oil tank;
an accumulator, an accumulator inlet of the accumulator and a pressurization outlet of the liquid pressurization device are communicated;
a switching valve, an inlet of which communicates with an accumulator outlet of the accumulator;
performing constant volume bomb making;
the oil injection inlet of the mechanical oil injector is communicated with the switch valve outlet of the switch valve, the mechanical oil injector is connected with the constant volume bomb, and the oil injection outlet of the mechanical oil injector is arranged in the inner space of the constant volume bomb;
the gas cylinder outlet of the gas cylinder is communicated with the inner space of the constant volume bomb;
the controller is electrically connected with the switch valve and the high-speed camera respectively, the controller controls the switch valve to be opened or closed, and the controller controls the high-speed camera to shoot images in the constant volume bomb.
2. The testing device of claim 1, further comprising a filter disposed on the conduit between the tank and the pressurized inlet.
3. The testing device of claim 1, further comprising a pressure testing device coupled to the accumulator to measure a pressure of the fluid within the accumulator.
4. The testing device according to claim 1, further comprising a pressure sensor, a displacement sensor and an oscilloscope, wherein the pressure sensor is arranged at the oil injection inlet of the mechanical oil injector, the displacement sensor is arranged on a needle valve of the mechanical oil injector, the oscilloscope is respectively and electrically connected with the pressure sensor, the displacement sensor and the controller, and the controller controls the oscilloscope to record measurement signals of the pressure sensor and the displacement sensor.
5. The testing device of claim 1, further comprising an optical system for creating a predetermined optical environment within the interior space of the constant volume bomb.
6. The test device of claim 1, wherein the switching valve comprises:
a valve body including a cavity including a first cavity communicating with the inlet passage through a first cavity inlet and having a first cavity outlet, and a second cavity communicating with the inlet passage through a second cavity inlet;
the valve core is arranged in the cavity, the first cavity and the second cavity are respectively positioned at two ends of the valve core, and the valve core can move between a first position and a second position in the cavity, wherein in the first position, the discharge channel is communicated with the second cavity through a second cavity outlet, and in the second position, the valve core blocks the second cavity outlet to close the discharge channel;
a first elastic member for applying a force to the spool to move it from the first position to the second position;
a switch structure for opening or closing the first cavity outlet.
7. The test apparatus of claim 6, wherein the pressure of the accumulator storing the fuel is 40 to 200 MPa.
8. The test device as claimed in claim 6, wherein the controller controls the switching structure such that the opening duration of the switching valve is 2ms to 6 ms.
9. The testing device of claim 1, further comprising an inlet gas heating device, wherein an inlet gas inlet of the inlet gas heating device is communicated with the gas cylinder outlet of the gas cylinder, and an inlet gas outlet of the inlet gas heating device is communicated with the inner space of the constant volume bomb.
10. The testing device of claim 9, further comprising an inlet valve and an outlet valve, the inlet valve being disposed on a passage between the cylinder outlet and the inlet, the outlet valve being in communication with the internal space of the constant volume cartridge through an outlet passage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910031476.4A CN111434916A (en) | 2019-01-14 | 2019-01-14 | Simplified testing device suitable for mechanical oil sprayer capacity bullet spraying test |
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| CN201910031476.4A CN111434916A (en) | 2019-01-14 | 2019-01-14 | Simplified testing device suitable for mechanical oil sprayer capacity bullet spraying test |
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| CN113374924A (en) * | 2021-06-16 | 2021-09-10 | 北京工业大学 | Method and device for realizing quick opening of controllable speed of valve based on hydraulic amplification principle |
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