CN112709655B - Tightness detection device for electric control high-pressure common rail system - Google Patents
Tightness detection device for electric control high-pressure common rail system Download PDFInfo
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- CN112709655B CN112709655B CN202110134497.6A CN202110134497A CN112709655B CN 112709655 B CN112709655 B CN 112709655B CN 202110134497 A CN202110134497 A CN 202110134497A CN 112709655 B CN112709655 B CN 112709655B
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- common rail
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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
- F02M65/006—Measuring or detecting fuel leakage of fuel injection apparatus
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model discloses an electric control high-pressure common rail system tightness detection device which comprises a high-pressure gas source component, a pressure stabilizing pipeline connected with the high-pressure gas source component, an oil pump component, a filtering pipeline connected with the oil pump component, a mixing pipeline simultaneously connected with the pressure stabilizing pipeline and the filtering pipeline respectively, a plurality of connecting pipelines spliced at the tail end of the mixing pipeline respectively, and a plurality of electric control high-pressure common rail systems connected with the connecting pipelines respectively, wherein pressure sensors are arranged on the mixing pipeline and the connecting pipelines, and sealing detection components are arranged at the interfaces of the electric control high-pressure common rail systems and used for detecting tightness of all pipeline interfaces of the electric control high-pressure common rail systems. Through the mode, the pressure sensor is arranged, the internal tightness of the system is detected through a differential pressure method, a plurality of groups of different electric control high-pressure systems can be detected simultaneously through a plugging mode, and tightness detection can be carried out on each connecting port on the electric control high-pressure system.
Description
Technical Field
The utility model relates to the field of diesel engines, in particular to a tightness detection device of an electric control high-pressure common rail system.
Background
With the rapid increase of urban transportation vehicles and ships around the world, the tail gas discharged by a diesel engine has become a main pollution source to the global environment, and the world has started to search for and take effective technical measures to actively reduce and control the discharge of pollutants, the common rail type electronically controlled fuel injection technology of the diesel engine is a new technology which is more successful in controlling the discharge of pollutants, and the technology directly or indirectly forms constant high-pressure fuel through a common rail, distributes the constant high-pressure fuel to each fuel injector, and controls the fuel quantity injected by the fuel injector to a combustion chamber of the diesel engine at fixed time and fixed quantity by means of the opening and closing of a high-speed electromagnetic switch valve integrated on each fuel injector, so as to ensure that the diesel engine achieves the optimal combustion ratio and good atomization, and the optimal ignition time, enough ignition energy and minimum pollution discharge.
The electronic control high-pressure common rail system has the advantages that the components are numerous and complex to install, in order to reduce potential safety hazards and ensure normal operation of the system, constant high-pressure tightness of the high-pressure common rail system needs to be ensured, and the system tightness detection method adopted in the prior art is used for starting the diesel engine to directly detect the pressure value of the internal rail or visually detect whether the internal rail is leaked or not.
The technical proposal provides a high-pressure common rail system tightness detection device, which comprises a common rail fuel injection pump which is arranged separately from a common rail diesel engine, wherein a motor for driving the common rail fuel injection pump to act is arranged corresponding to the common rail fuel injection pump, a low-pressure delivery pump inlet of the common rail fuel injection pump is communicated with an oil-water separator through a fuel pipe, an inlet of the oil-water separator is communicated with a communicating oil tank through the fuel pipe, a low-pressure delivery pump outlet of the common rail fuel injection pump is connected with a fuel inlet of a fuel filter through the fuel pipe, a fuel outlet of the fuel filter is connected with a fuel inlet of the common rail fuel injection pump through the fuel pipe, a high-pressure fuel outlet of the common rail fuel injection pump is connected with an electric control high-pressure common rail system through the high-pressure fuel pipe, and a fuel return hole of the common rail fuel injection pump is communicated with the oil tank through the fuel pipe; according to the utility model, the tightness of the internal combustion oil pressure of the common rail system is measured and verified through the external common rail oil injection pump, repeated disassembly and assembly are avoided, the diesel engine is protected, however, the whole set of additional oil inlet component is used for tightness detection, the structure is huge and the use is inconvenient, the device can not detect the tightness of the fuel supply module of the electric control high-pressure common rail system, the back pressure type seal detection is carried out on the inside of the system through diesel injection, the reaction speed is low, the automation degree is low, and the response speed is further slowed down due to the secondary filtration of the diesel injection, so that the use cost of the tightness detection device is high.
Therefore, it is necessary to design an electric control high-pressure common rail system tightness detection device which has a simple structure, is convenient to operate, has a high response speed, and can detect a plurality of systems simultaneously and independently detect tightness of a plurality of connection ports of each system.
Disclosure of Invention
In order to overcome the problem of the existing sealing detection device of the electric control high-pressure common rail system, the utility model provides the sealing detection device of the electric control high-pressure common rail system, which can be used for simultaneously detecting the sealing of a plurality of groups of different electric control high-pressure common rail systems by obtaining pressure difference values through pressure sensors at system access positions, and sealing detection assemblies are respectively arranged at the connection positions of all components of the electric control high-pressure common rail system, so that the sealing condition of the interface positions of the components is independently detected.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides an automatically controlled high pressure common rail system leakproofness detection device, includes high-pressure gas source subassembly, with steady voltage pipeline, the oil pump subassembly that high-pressure gas source subassembly is connected, with the filter tube that the oil pump subassembly is connected, respectively with steady voltage pipeline and filter tube are the hybrid tube who connects simultaneously, peg graft respectively in a plurality of connecting tubes of hybrid tube tail end, respectively with a plurality of automatically controlled high pressure common rail system that connecting tube are connected, all be provided with pressure sensor on hybrid tube and the connecting tube, a plurality of the interface department of automatically controlled high pressure common rail system all is provided with sealed detection subassembly for detect the leakproofness of each pipeline interface of automatically controlled high pressure common rail system.
Further, the tail end of the pressure stabilizing pipeline and the tail end of the filtering pipeline are connected with the mixing pipeline through a three-way pipe, a first branch pipe is arranged on the mixing pipeline, and a first pressure sensor is arranged in the first branch pipe; and the tail end of the mixing pipeline is provided with a plurality of second branch pipes connected with the electric control high-pressure common rail system.
Further, the second branch pipes are connected with the connecting pipelines through matched interface components, and the interface components are sealed plug-in interfaces which comprise male heads connected with the second branch pipes and female seats connected with the connecting pipelines.
Further, a plurality of third branch pipes are arranged on the connecting pipelines, and a plurality of second pressure sensors are arranged in the third branch pipes.
Further, the automatically controlled high pressure common rail system is including connecting in common rail pipeline of connecting tube tail end, setting are in a plurality of shunt ports, one end under the common rail pipeline with the drainage pipeline that the shunt ports are connected, with the sprayer that the drainage pipeline other end is connected, connecting tube with the junction of common rail pipeline the shunt ports with the junction of drainage pipeline, the drainage pipeline with the junction of sprayer all is provided with sealed detection subassembly.
Further, the seal detection assembly comprises a seal pipeline which is matched and connected to the joint, openings at two ends of the seal pipeline are respectively matched and connected with the outer sides of the upper part and the lower part of the joint, the caliber of the middle part of the seal pipeline is larger than that of the outer side of the joint, a cavity is formed between the two parts, annular slotted holes are respectively formed at two ends of the cavity, elastic sealing rings are matched and connected to the annular slotted holes, the cavity is sealed, a through hole is formed above the cavity, and a pressure gauge is inserted in the through hole in a sealing mode.
Further, a first electromagnetic valve, a pneumatic linkage piece and a second electromagnetic valve are sequentially arranged on the pressure stabilizing pipeline from an air inlet connected with the high-pressure air source assembly.
Further, a gear pump and a third electromagnetic valve are sequentially arranged on the filter pipeline from an oil inlet connected with the oil pump assembly.
Furthermore, the high-pressure air source component is internally provided with an air pressure control module, so that the pressure value of the high-pressure air flow can be changed.
Further, still include control assembly, control assembly includes microprocessor and instruction unit, microprocessor embeds the timing unit, microprocessor's signal input part is connected to first pressure sensor, second pressure sensor, manometer respectively, and its signal output part is connected to first solenoid valve, second solenoid valve, third solenoid valve, gear pump and instruction unit.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the tightness detection device for the electric control high-pressure common rail system, the pressure sensors are arranged on the mixing pipeline and the connecting pipeline to detect the air pressure difference in the channels, so that the tightness of each detected electric control high-pressure common rail system is judged; meanwhile, the oil inlet pipeline is connected to the mixing pipeline of the device, so that the volume of the air in the electric control high-pressure common rail system to be detected is reduced, and the response speed of the detection device is improved.
2. According to the tightness detection device for the electric control high-pressure common rail system, the independent high-pressure air source component and the independent oil pump component are arranged, and the pneumatic duplex piece is used for stabilizing high-pressure air, so that the traditional complex structure of multi-stage filtration and multi-stage pump body matching with an oil tank is eliminated, the detection structure is optimized, and the installation and the disassembly are not needed; meanwhile, gas is selected as a tightness detection medium, so that the device is simple in structure, low in cost and convenient to operate.
3. According to the tightness detection device for the electric control high-pressure common rail system, the plurality of branch pipelines are arranged at the tail end of the mixing pipeline and can be connected to different electric control high-pressure common rail systems, and the electric control high-pressure common rail system can be connected in a matched mode through different sealing plug-in components, so that the electric control high-pressure common rail system can be detached and replaced with different systems conveniently, and the system diversity and convenience of the device for detecting are improved.
4. According to the tightness detection device for the electric control high-pressure common rail system, the tightness detection assemblies are arranged at the joints of different electric control high-pressure common rails, tightness detection can be carried out on different connectors at the same time, and tightness of the joints can be judged by reading the pressure gauge.
Drawings
FIG. 1 is a schematic illustration of an axially measured structure of the present utility model;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
FIG. 3 is a schematic top view of the present utility model;
FIG. 4 is a schematic diagram of the axial structure of the seal detection assembly of the present utility model;
FIG. 5 is a schematic side view of a seal detection assembly of the present utility model;
fig. 6 is a sectional view taken along the direction B in fig. 5;
FIG. 7 is a control assembly connection schematic of the present utility model;
the components in the drawings are marked as follows: 1. a high pressure gas supply assembly; 2. an oil pump assembly; 3. a pressure stabilizing pipeline; 31. a first electromagnetic valve; 32. a pneumatic linkage; 33. a second electromagnetic valve; 4. a filter tube; 41. a gear pump; 42. a third electromagnetic valve; 5. a three-way pipe; 6. a mixing pipe; 61. a first pressure sensor; 62. a male; 7. a drainage tube; 8. a connecting pipe; 81. a second pressure sensor; 82. a female seat; 9. a common rail pipe; 10. a seal detection assembly; 101. sealing the pipeline; 102. a pressure gauge; 103. an elastic sealing ring; 111. a microprocessor; 112. a timing unit; 113. an indication unit.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
Example 1
As shown in fig. 1, an electric control high-pressure common rail system tightness detection device comprises a high-pressure air source component 1, a pressure stabilizing pipeline 3 connected with the high-pressure air source component 1, an oil pump component 2, a filtering pipeline 4 connected with the oil pump component 2, a mixing pipeline 6 connected with the pressure stabilizing pipeline 3 and the filtering pipeline 4 simultaneously, a plurality of connecting pipelines 8 connected with the tail end of the mixing pipeline 6 in an inserting mode respectively, and a plurality of electric control high-pressure common rail systems connected with the connecting pipelines 8 respectively, wherein the high-pressure air source component 1 inputs pressure stabilizing air flow to the electric control high-pressure common rail systems through the pressure stabilizing pipeline 3, the oil pump component 2 inputs diesel oil to the electric control high-pressure common rail systems through the filtering pipeline 4 so as to reduce the air volume in the pipelines and accelerate the response speed of detection, the pressure sensors are arranged on the mixing pipeline 6 and the connecting pipelines 8, the sealing detection components 10 are arranged at the interfaces of the electric control high-pressure common rail systems respectively, and the sealing detection components 10 are used for detecting the sealing conditions of the interfaces of the electric control high-pressure common rail systems, and the sealing conditions are more convenient to replace corresponding sealing components timely.
As shown in fig. 3, in this embodiment, the tail end of the pressure stabilizing pipe 3 and the tail end of the filtering pipe 4 are connected with the mixing pipe 6 through a tee pipe 5, a first branch pipe is arranged on the mixing pipe 6, a first pressure sensor 61 is arranged in the first branch pipe, and the first pressure sensor 61 reads the pressure value of the first branch pipe; the tail end of the mixing pipeline 6 is provided with a plurality of second branch pipes connected with the electric control high-pressure common rail system, and the sealing detection can be carried out on a plurality of electric control high-pressure common rail systems at the same time.
As shown in fig. 2, in this embodiment, a plurality of second branch pipes are all connected with a plurality of connecting pipes 8 through assorted interface components, the interface components can be replaced according to actual demands, and easy dismounting has increased detection device's convenience, the interface components is sealed plug-in type interface, its include with the public head 62 of second branch pipe connection, with female seat 82 that connecting pipe 8 is connected, the second branch pipe with connecting pipe 8 is through the public head 62 and female seat 82 sealing connection of cooperation grafting.
In this embodiment, a plurality of third branch pipes are disposed on the connecting pipes 8, and a plurality of second pressure sensors 81 are disposed in the third branch pipes, where the second pressure sensors 81 are used for reading the pressure values in the connecting pipes 8.
In this embodiment, the automatically controlled high pressure common rail system is including connecting in common rail pipeline 9 of connecting tube 8 tail end, set up a plurality of shunt ports, one end under the common rail pipeline 9 with the drainage pipeline 7 that the shunt port is connected, with the sprayer that the drainage pipeline 7 other end is connected, connecting tube 8 with the junction of common rail pipeline 9 the shunt port with the junction of drainage pipeline 7 with the sprayer all is provided with seal detection subassembly 10, seal detection subassembly 10 cooperation is connected in the junction of system internal difference, detects the leakproofness of its interface.
As shown in fig. 4 to 6, in this embodiment, the seal detection assembly 10 includes a seal pipe 101 cooperatively connected to the connection portion, the seal pipe 101 has a joint portion of the connection portion wrapped by an upper and a lower connection members, openings at two ends of the seal pipe 101 are respectively cooperatively connected with outer sides of the upper and the lower portions of the connection portion, a caliber of an intermediate portion is larger than that of an outer side of the connection portion, a cavity is formed between the two portions, the cavity can accommodate gas leaking out of the connection portion, whether leakage occurs or not is judged according to a pressure value in the cavity, annular slots are respectively provided at two ends of the cavity, elastic sealing rings 103 are cooperatively connected to the annular slots, the elastic sealing rings 103 are limited along an axial direction of the elastic sealing rings, and are elastically sealed to the connection portion, so that the cavity is sealed, a through hole is provided above the cavity, a pressure gauge 102 is sealed and inserted in the through hole, an elastic material is arranged outside a plug of the pressure gauge 102, and after the through hole is inserted, whether the measured gas can be accurately read, and the gas can be judged whether the leakage exists at the connection portion.
As shown in fig. 7, in this embodiment, the pressure stabilizing pipe 3 is provided with a first electromagnetic valve 31, a pneumatic duplex member 32, and a second electromagnetic valve 33 in order from the air inlet connected to the high-pressure air supply assembly 1, where the pneumatic duplex member 32 is a pneumatic element composed of an air filter and a pressure reducing valve, and the pressure stabilizing pipe realizes pressure stabilizing adjustment of air pressure while filtering and purifying inflow air, and the first electromagnetic valve 31 and the second electromagnetic valve 33 play a role in regulating air flow in the pipe.
In this embodiment, a gear pump 41 and a third electromagnetic valve 42 are disposed on the filtering pipe 4 in order from an oil inlet connected with the oil pump assembly 2, and the gear pump 41 pressurizes and discharges diesel oil flowing out from the oil pump assembly 2.
In this embodiment, the air pressure control module is built in the high-pressure air source assembly 1, which can change the pressure value of the high-pressure air flow, continuously adjust the pressure value of the input air flow, and observe the tightness of the system, so that the detection result is safer and more reliable.
In this embodiment, the control unit further includes a microprocessor 111 and an indication unit 113, where the microprocessor 111 has a timing unit 112 built in, signal input ends of the microprocessor 111 are respectively connected to the first pressure sensor 61, the second pressure sensor 81, and the pressure gauge 102, and signal output ends thereof are connected to the first electromagnetic valve 31, the second electromagnetic valve 33, the third electromagnetic valve 42, the gear pump 41, and the indication unit 113, and the control unit makes a judgment according to signals transmitted by the pressure sensors and feeds back to each electromagnetic valve, the gear pump 41, and the like, to control the working state thereof.
By the mode, when the detection device is started, the microprocessor controls the third electromagnetic valve and the gear pump to work, so that the oil pump assembly injects diesel into the mixing pipeline, and after the timing unit counts to a preset time, the third electromagnetic valve and the gear pump are closed; then the microprocessor controls the first electromagnetic valve and the second electromagnetic valve to work, and after the timing unit counts the preset time, the first electromagnetic valve and the second electromagnetic valve are closed; after the timing unit counts the preset time, the first pressure sensor and the second pressure sensor respectively input the detected data values to the microprocessor, the microprocessor calculates the pressure drop difference value in each system, and if the pressure drop difference value is higher than the preset value, the indication unit is controlled to alarm; after the timing unit counts the preset time, each pressure gauge inputs the detected data value to the microprocessor, and the microprocessor judges whether the corresponding connection position has leakage or not according to each data value.
The foregoing is merely illustrative of the present utility model and is not to be construed as limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; all equivalent structures or equivalent flow changes made by the specification and the attached drawings of the utility model or directly or indirectly applied to other related technical fields are included in the protection scope of the utility model.
Claims (8)
1. The tightness detection device of the electric control high-pressure common rail system is characterized by comprising a high-pressure gas source assembly (1), a pressure stabilizing pipeline (3) connected with the high-pressure gas source assembly (1), an oil pump assembly (2), a filtering pipeline (4) connected with the oil pump assembly (2), a mixing pipeline (6) respectively connected with the pressure stabilizing pipeline (3) and the filtering pipeline (4) at the same time, a plurality of connecting pipelines (8) respectively inserted at the tail ends of the mixing pipelines (6), and a plurality of electric control high-pressure common rail systems respectively connected with the connecting pipelines (8); the electric control high-pressure common rail system comprises a common rail pipeline (9) connected to the tail end of the connecting pipeline (8), a plurality of split ports arranged below the common rail pipeline (9), a drainage pipeline (7) with one end connected with the split ports, and an oil sprayer connected with the other end of the drainage pipeline (7), wherein a sealing detection assembly (10) is arranged at the joint of the connecting pipeline (8) and the common rail pipeline (9), the split ports and the drainage pipeline (7) and the joint of the drainage pipeline (7) and the oil sprayer and used for detecting the tightness of each pipeline interface of the electric control high-pressure common rail system; the sealing detection assembly (10) comprises a sealing pipeline (101) which is matched and connected to the joint, openings at two ends of the sealing pipeline (101) are respectively matched and connected with the outer sides of the upper part and the lower part of the joint, the caliber of the middle part is larger than that of the outer side of the joint, a cavity is formed between the two parts, annular slotted holes are respectively arranged at two ends of the cavity, elastic sealing rings (103) are matched and connected to the annular slotted holes, the cavity is sealed, a through hole is arranged above the cavity, a pressure gauge (102) is inserted in the through hole in a sealing manner, an elastic material is arranged outside a plug of the pressure gauge (102), and sealing is formed after the plug is inserted into the through hole; pressure sensors are arranged on the mixing pipeline (6) and the connecting pipeline (8).
2. The tightness detection device of the electronic control high-pressure common rail system according to claim 1, wherein the tail end of the pressure stabilizing pipeline (3) and the tail end of the filtering pipeline (4) are connected with the mixing pipeline (6) through a tee pipe (5), a first branch pipe is arranged on the mixing pipeline (6), and a first pressure sensor (61) is arranged in the first branch pipe; the tail end of the mixing pipeline (6) is provided with a plurality of second branch pipes connected with the electric control high-pressure common rail system.
3. The tightness detection device of an electrically controlled high pressure common rail system according to claim 2, wherein a plurality of second branch pipes are connected with a plurality of connecting pipelines (8) through matched interface components, and the interface components are sealed plug-in interfaces, and comprise a male head (62) connected with the second branch pipes and a female seat (82) connected with the connecting pipelines (8).
4. An electrically controlled high pressure common rail system tightness detection device according to claim 3, characterized in that a third branch pipe is arranged on each of the plurality of connecting pipes (8), and a second pressure sensor (81) is arranged in each of the plurality of third branch pipes.
5. The tightness detection device of the electronic control high-pressure common rail system according to claim 1, wherein a first electromagnetic valve (31), a pneumatic duplex member (32) and a second electromagnetic valve (33) are sequentially arranged on the pressure stabilizing pipeline (3) from an air inlet connected with the high-pressure air source assembly (1).
6. The tightness detection device of the electric control high-pressure common rail system according to claim 1, wherein a gear pump (41) and a third electromagnetic valve (42) are sequentially arranged on the filtering pipeline (4) from an oil inlet connected with the oil pump assembly (2).
7. The tightness detection device of the electronic control high-pressure common rail system according to claim 1, wherein a pneumatic control module is arranged in the high-pressure air source assembly (1) and can change the pressure value of high-pressure air flow.
8. The device for detecting the tightness of the electric control high-pressure common rail system according to claim 1, further comprising a control assembly, wherein the control assembly comprises a microprocessor (111) and an indication unit (113), the microprocessor (111) is internally provided with a timing unit (112), signal input ends of the microprocessor (111) are respectively connected to the first pressure sensor (61), the second pressure sensor (81) and the pressure gauge (102), and signal output ends of the microprocessor are connected to the first electromagnetic valve (31), the second electromagnetic valve (33), the third electromagnetic valve (42), the gear pump (41) and the indication unit (113).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110134497.6A CN112709655B (en) | 2021-01-29 | 2021-01-29 | Tightness detection device for electric control high-pressure common rail system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110134497.6A CN112709655B (en) | 2021-01-29 | 2021-01-29 | Tightness detection device for electric control high-pressure common rail system |
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| CN112709655A CN112709655A (en) | 2021-04-27 |
| CN112709655B true CN112709655B (en) | 2023-09-22 |
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| CN112709655A (en) | 2021-04-27 |
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