CN109630383B - Vacuum pump simulation loading system - Google Patents
Vacuum pump simulation loading system Download PDFInfo
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- CN109630383B CN109630383B CN201811506526.1A CN201811506526A CN109630383B CN 109630383 B CN109630383 B CN 109630383B CN 201811506526 A CN201811506526 A CN 201811506526A CN 109630383 B CN109630383 B CN 109630383B
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- air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
A vacuum pump simulated loading system comprising: the measurement and control end is provided with an air supply pump and a pressure regulating air pump; a pressure balance module is arranged at the measurement and control end, a left cavity, a right cavity and a diaphragm positioned between the left cavity and the right cavity are arranged in the pressure balance module, and the diaphragm deforms and deflects in the corresponding cavity according to the vacuum degree difference value between the left cavity and the right cavity; the air supply pump supplies make-up air from the external phase vacuum tank, the pressure regulating air pump is connected with the left cavity body air and supplies or extracts the air of the left cavity body according to the vacuum degree in the left cavity body, and the right cavity body is connected with the vacuum tank air to realize negative feedback control on the vacuum degree in the vacuum tank and realize continuous and stable air supply and pressure regulation.
Description
Technical Field
The invention relates to a vacuum pump simulation loading system.
Background
The front end of a conventional engine may contain several power accessories: generators, air conditioning compressors, vacuum pumps, etc. Each power accessory has its own role in the overall vehicle, for example: the generator is driven by the crankshaft of the engine to realize high-speed rotation power generation, and the generated electric energy is supplied to various electric appliances (such as vehicle lamps, a central control display screen, an ECU (electronic control unit) and the like) of the whole vehicle.
Among these power accessories, the vacuum pump is also an important accessory, and the vacuum pump generates a vacuum pumping effect by the high-speed rotation of the engine drive (generally, the engine camshaft directly drives), and provides a certain vacuum degree for the brake assisting force of the whole vehicle, i.e., the vacuum pump is required to be operated on the whole vehicle, i.e., a certain vacuum degree is generated by consuming part of the power of the engine. In the test and verification process of the whole engine, the vacuum pump cannot run with load because a whole vehicle brake system is not attached, and the common method is to run the vacuum pump in an idle running mode. The running state is different from the actual state of the whole engine, so that the verification of the whole engine is different from the actual state, and the verification effect is not in accordance with the actual state.
The invention relates to the field of engine test development, in particular to the field of examination of a front-end gear train of an engine or the field of examination of the maximum mechanical load of the engine. As a vacuum pump simulation loading system, the vacuum pump can generate vacuum degree in a controlled manner during the whole engine test by indirectly simulating a whole vehicle brake system.
Disclosure of Invention
The invention aims to provide a simulation system which can realize the simulation loading of a vacuum pump, can continuously load and has higher loading precision.
In order to achieve the above technical object, the present invention provides a vacuum pump simulation loading system, which includes: the vacuum tank and the pumping end thereon, the pumping end is connected with a vacuum pump, wherein: it still includes: the measurement and control end is provided with an air supply pump and a pressure regulating air pump; the pressure balance module is arranged at the measurement and control end, a left cavity, a right cavity and a diaphragm positioned between the left cavity and the right cavity are arranged in the pressure balance module, and the diaphragm deforms and deflects in the corresponding cavity according to the vacuum degree difference value between the left cavity and the right cavity; the tonifying qi air pump from external to the vacuum tank provides make-up gas, the pressure regulating air pump with left side cavity is gaseous continuous, and according to vacuum in the left side cavity provides or extracts the gas of left side cavity, right side cavity with vacuum tank is gaseous continuous.
The invention realizes negative feedback control on the vacuum degree in the vacuum tank and realizes continuous and stable air supply and pressure regulation by the balance and transformation of the vacuum degree in the pressure balance module and the bidirectional regulation of the air supply pump and the pressure regulation pump.
As a further improvement, the middle part of the vacuum tank is also provided with a main vacuum degree sensor; a measurement and control end vacuum degree sensor is arranged in the left cavity; and the main vacuum degree sensor and the measurement and control end vacuum degree sensor are in signal control connection with a control unit positioned outside.
As a further improvement, when the diaphragm is deformed and deviated in the corresponding cavity, a voltage signal is generated in the corresponding cavity and is transmitted to the control unit.
As a further improvement, the pressure regulating air pump is connected with the left cavity through a pressure regulating pipeline, and the air supplementing air pump is connected with the vacuum tank through an air supplementing pipeline.
As a further improvement, the pressure regulating air filter is installed at the inlet of the pressure regulating air pump, and the air supplementing filter is installed at the inlet of the air supplementing air pump.
As a further improvement, the pressure regulating air pump and the air supplementing air pump are both high-precision air pumps and are in signal control connection with the control unit.
The invention can have the closed-loop control of PID control and feedback regulation, and has higher control precision.
Drawings
FIG. 1 is a schematic external view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention.
Reference numerals: 1 pressure balance module, 11 right cavitys, 12 left cavitys, 13 diaphragms, 15 observe and control ends, 2 observe and control end sensor, 3 pressure regulating pipeline, 4 pressure regulating air pumps, 5 main vacuum degree sensors, 6 air supplement pipelines, 7 air supplement air pumps, 8 bleed ends, 9 vacuum tank, 10 pressure regulating air filters, 14 air supplement air filters.
Detailed Description
As shown in fig. 1 and 2, the present invention provides a vacuum pump simulated loading system, comprising: vacuum tank 9 and the tip of bleeding 8 on it, bleed 8 is continuous with the vacuum pump, wherein: it still includes: a measurement and control end 15, an air supplementing pump 7 and a pressure regulating pump 4; the pressure balance module 1 is arranged at the measurement and control end 15, a left cavity 12, a right cavity 11 and a diaphragm 13 positioned between the left cavity 12 and the right cavity 11 are arranged in the pressure balance module 1, and the diaphragm 13 deforms and deflects in the corresponding cavity according to the vacuum degree difference between the left cavity 12 and the right cavity 11; air make-up pump 7 from external to vacuum tank 9 provides make-up gas, pressure regulating air pump 4 with left side cavity 12 is gaseous continuous, and according to vacuum in the cavity 12 of a left side provides or extracts the gas of left side cavity 12, right side cavity 11 with vacuum tank 9 is gaseous continuous.
The invention realizes negative feedback control on the vacuum degree in the vacuum tank 9 and realizes continuous and stable air supplement and pressure regulation by the vacuum degree balance and transformation in the pressure balance module 1 and the bidirectional regulation of the air supplement air pump 7 and the pressure regulation air pump 4.
As a further improvement, a main vacuum degree sensor 5 is arranged in the middle of the vacuum tank 9; a measurement and control end vacuum degree sensor 2 is arranged in the left cavity 12; and the main vacuum degree sensor 5 and the measurement and control end vacuum degree sensor 2 are in signal control connection with a control unit positioned outside.
As a further improvement, when the diaphragm 13 is deformed and deflected in the corresponding cavity, a voltage signal is generated in the corresponding cavity and transmitted to the control unit.
As a further improvement, the pressure regulating air pump 4 is in air connection with the left cavity 12 through the pressure regulating pipeline 3, and the air supplementing air pump 7 is in air connection with the vacuum tank 9 through the air supplementing pipeline 6.
As a further improvement, a pressure-regulating air filter 10 is installed at the inlet of the pressure-regulating air pump 4, and an air-supplementing air filter 14 is installed at the inlet of the air-supplementing air pump 7.
As a further improvement, the pressure-regulating air pump 4 and the air-supplementing air pump 7 are both high-precision air pumps and are in signal control connection with the control unit.
The invention can realize the simulation loading of the vacuum pump, can continuously load and has higher loading precision; the vacuum pump can be stably loaded at the set vacuum degree A value, and the control characteristic is better; the invention can realize the rapid and sensitive adjustment of the gas content (namely the vacuum degree) in the vacuum tank by controlling and adjusting the high-precision gas supply pump; the closed-loop control of P ID control and feedback regulation can be realized, and the control precision is higher.
In the preferred embodiment of the present invention, the pumping line of the vacuum pump is connected to the pumping port 8, when the vacuum pump is operated at a high speed, the gas in the vacuum tank 9 is pumped out to the external atmosphere gradually, i.e. the vacuum degree in the vacuum tank 9 is gradually increased, and the vacuum degree in the vacuum tank 9 can be detected by the main vacuum degree sensor 5 and input to the external control unit.
A set of air supply pump 7 is arranged on the vacuum tank 9 and communicated with the vacuum tank 9 through an air supply pipeline 6, the air supply pump 7 can input external air into the cavity of the vacuum tank 9, namely the air in the vacuum tank 9 can be continuously supplied, the vacuum degree B in the vacuum tank 9 can be maintained or reduced by the supplied air, and the vacuum degree B in the vacuum tank 9 acts on the diaphragm 13. And the outside air passes through the air supplementing filter 14 before entering the air supplementing pump 7, and the outside air is dried and filtered to remove impurities. Meanwhile, the air supply pump 7 is a high-precision air pump, and the air supply amount can be accurately controlled.
A set of pressure balance module 1 is arranged at the left end of the vacuum tank 9 and mainly comprises a right cavity 11, a left cavity 12 and a membrane 13. The left and right chambers are described with reference to fig. 1 and 2, and it can be understood by those skilled in the art that the right chamber 11 is a chamber connected to the vacuum tank 9, and the left chamber 12 is a chamber connected to the pressure-regulating air pump 4. The pressure balance module 1 at the left end of the vacuum tank 9 is communicated with the pressure regulating air pump 4 through the pressure regulating pipeline 3, on one hand, the pressure regulating air pump 4 can pump the air in the left cavity 12 to the external atmosphere, a certain vacuum degree A is formed in the left cavity 12, the vacuum degree A acts on the diaphragm 13, and the vacuum degree can be measured by the measurement and control end sensor 2 and input to the control unit; on the other hand, the pressure regulating air pump 4 can also pump the external air into the left cavity 12, so that the vacuum degree in the left cavity 12 is reduced, the accurate control and input of the vacuum degree in the left cavity 12 are realized, and the vacuum degree A in the left cavity 12 can be set independently according to requirements. And the outside air can be dried and filtered to remove impurities through the air filter 10 before entering the pressure-regulating air pump 4. Meanwhile, the pressure regulating air pump 4 is a high-precision air pump, and can accurately control the air supplement amount and the air extraction amount.
As can be seen from the above, the diaphragm 13 is simultaneously acted by the vacuum degree in the left cavity 12 and the vacuum degree B of the right cavity 11 (communicated with the vacuum tank 9), when the vacuum degree A in the left cavity 12 is greater than the vacuum degree B of the right cavity 11, the diaphragm 13 moves leftwards and contacts the left pipe wall, at this moment, the control unit receives a voltage signal transmitted by the left pipe wall, and the control unit judges the difference value of the vacuum pumps on the two sides according to the voltage signal; similarly, when the vacuum degree a in the left chamber 12 is smaller than the vacuum degree B in the right chamber 11, the diaphragm 13 moves to the right and contacts the right pipe wall, at this time, the control unit receives a voltage signal transmitted from the right pipe wall, and the control unit determines the size and difference of the vacuum pumps on the two sides according to the size of the voltage signal. The control unit controls and adjusts the air supply pump 7 according to the control modes of PID of the vacuum degrees A and B on the two sides, so that the vacuum degree B in the vacuum tank 9 (equal to the right cavity 11) accurately tends to the vacuum degree A of the left cavity 12, when the target vacuum degree B is equal to the set vacuum degree A, the diaphragm 13 cannot generate voltage values on the two sides, the control unit stops adjusting and maintains the air supply pump 7 to stably operate at the moment, and the vacuum pump continuously performs air extraction work at the set vacuum degree A by continuously supplying air. Therefore, the vacuum pump is stably and accurately loaded at the set vacuum degree A value and is continuously loaded.
When the air replenishing pump 7 does not replenish air into the vacuum tank 9, the vacuum pump can achieve the maximum vacuum degree which can be achieved by the vacuum pump after the vacuum pump is continuously operated. When the air supply pump 7 intermittently supplies air to the vacuum tank 9, the intermittent work of the vacuum pump can be realized.
The invention can realize the simulation loading of the vacuum pump, can realize modes such as continuous loading, maximum loading, intermittent loading and the like, and has higher loading precision; when the engine is tested and verified, the engine can be close to the state of the whole vehicle, and the vacuum pump runs with load; the vacuum pump can be stably loaded at the set vacuum degree A value, and the control characteristic is better; the invention can realize the rapid and sensitive adjustment of the gas content (namely the vacuum degree) in the vacuum tank by controlling and adjusting the high-precision gas supply pump; the invention can have the closed-loop control of PID control and feedback regulation, and has higher control precision.
The corresponding arrangement structure is simple, the operation is convenient and fast, the universality to various vacuum pumps is better, and the trouble of applying the brake assistance of the whole vehicle is avoided; the invention principle, the control and feedback process are innovative and comprise a high-precision air pump, a diaphragm type pressure balance module, a PID control mode, a scheme idea of pressure regulation and air supplement, selection of various loading modes and the like; the invention controls and adjusts through the main control unit, each module is convenient and fast to install, the function is specific and reliable, the later period can be expanded to wireless integrated management and the like, and the intelligence and the universality are stronger. The invention can be expanded and applied to vacuum degree control in other fields, such as vacuum valve control and the like in the later period.
It is to be understood that the scope of the present invention is not to be limited to the non-limiting embodiments, which are illustrated as examples only. The essential protection sought herein is further defined in the scope provided by the independent claims, as well as in the claims dependent thereon.
Claims (3)
1. A vacuum pump simulation loading system, the vacuum pump simulation loading system is used for engine complete machine test, and comprises: vacuum tank (9) and air exhaust end (8) on it, air exhaust end (8) link to each other its characterized in that with the vacuum pump:
it still includes: a measurement and control end (15), an air supply pump (7) and a pressure regulating air pump (4);
the pressure balance module (1) is arranged at the measurement and control end (15), a left cavity (12), a right cavity (11) and a diaphragm (13) positioned between the left cavity and the right cavity are arranged in the pressure balance module (1), and the diaphragm (13) deforms and deflects in the corresponding cavity according to the vacuum degree difference between the left cavity (12) and the right cavity (11);
the air supplementing pump (7) supplies supplementing air to the vacuum tank (9) from the outside, the pressure regulating air pump (4) is in air connection with the left cavity (12) and supplies or extracts air of the left cavity (12) according to the vacuum degree in the left cavity (12), and the right cavity (11) is in air connection with the vacuum tank (9);
the middle part of the vacuum tank (9) is also provided with a main vacuum degree sensor (5); a measurement and control end vacuum degree sensor (2) is arranged in the left cavity (12); the main vacuum degree sensor (5) and the measurement and control end vacuum degree sensor (2) are in signal connection with an external control unit;
when the diaphragm (13) deforms and deflects in the corresponding cavity, a voltage signal is generated in the corresponding cavity and is transmitted to the control unit;
pressure regulating air pump (4) through pressure regulating pipeline (3) with left side cavity (12) is gaseous continuous, tonifying qi air pump (7) through tonifying qi pipeline (6) with vacuum tank (9) is gaseous continuous.
2. The vacuum pump simulated loading system of claim 1 wherein: pressure regulating air filter (10) are installed to the entry of pressure regulating air pump (4), air supplement air filter (14) are installed to the entry of air supplement air pump (7).
3. A vacuum pump dummy loading system according to claim 2, wherein: the pressure regulating air pump (4) and the air supplementing air pump (7) are both high-precision air pumps and are in signal connection with the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811506526.1A CN109630383B (en) | 2018-12-10 | 2018-12-10 | Vacuum pump simulation loading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811506526.1A CN109630383B (en) | 2018-12-10 | 2018-12-10 | Vacuum pump simulation loading system |
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| Publication Number | Publication Date |
|---|---|
| CN109630383A CN109630383A (en) | 2019-04-16 |
| CN109630383B true CN109630383B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811506526.1A Active CN109630383B (en) | 2018-12-10 | 2018-12-10 | Vacuum pump simulation loading system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370386B (en) * | 2020-10-15 | 2024-05-03 | 海信冰箱有限公司 | Refrigerator vacuumizing control method and refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203580929U (en) * | 2013-12-05 | 2014-05-07 | 王水争 | Vacuum supply system for motor vehicle unpowered state brake device |
| CN104057942A (en) * | 2014-05-27 | 2014-09-24 | 王水争 | Vacuum supply system for motor vehicle brake devices |
| US10094381B2 (en) * | 2015-06-05 | 2018-10-09 | Agilent Technologies, Inc. | Vacuum pump system with light gas pumping and leak detection apparatus comprising the same |
| CN206723000U (en) * | 2017-05-09 | 2017-12-08 | 天津沃昌机械设备有限公司 | Vacuum Pumps Station |
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Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Applicant after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 No. 669 Shixin Road, Taohua Industrial Park, Hefei City, Anhui Province Applicant before: Anhui Jianghuai Automobile Group Limited by Share Ltd |
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