CN202177417U - Test system for micro-leakage amount of sealing element - Google Patents
Test system for micro-leakage amount of sealing element Download PDFInfo
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- CN202177417U CN202177417U CN201120149434XU CN201120149434U CN202177417U CN 202177417 U CN202177417 U CN 202177417U CN 201120149434X U CN201120149434X U CN 201120149434XU CN 201120149434 U CN201120149434 U CN 201120149434U CN 202177417 U CN202177417 U CN 202177417U
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Abstract
The utility model discloses a test system for micro-leakage amount of a sealing element, comprising a pressure supplying system, a pressurizing system, a pressure adjusting system, a pressure maintaining test system, a pressure release safety system and a whole machine control system, wherein the pressure supplying system provides high-pressure liquid power higher than the test requirement for a tested element; the pressurizing system provides a simulated working environment for the tested element; the pressure difference environment required by the tested element can be accurately adjusted by the pressure adjusting system so as to be further closer to the working pressure environment of the tested element; and the pressure maintaining test system can measure and calculate the leakage amount of liquid under the pressure maintaining environment by checking the pressure change of tested liquid under the pressure maintaining environment. In the test system, the problem that the test precision of the traditional test system of the leakage amount is not high is solved, fast and accurate measurement is realized, simultaneously the generalized measurement of the gas and liquid sealing element is met, and the leakage amount of a unit time component can be accurately calculated.
Description
Technical field
The utility model relates to a kind of test macro of seal element tiny leakage amount.
Background technology
In various industrial systems and auto industry, high pressure and vacuum work link are comparatively common.All exist certain leakage rate allowable for common fuel injector of a lot of components and parts especially valve class components and parts such as motor car engine etc.; The leakage rate of these elements and leakage rate allowable all are extremely micro-under many circumstances, are difficult to detection or detect cost higher relatively through classic method.
Present existing checkout equipment is existing more; Leak like ultrasound examination; This method for the Leak Detection of gas comparatively effectively but also unusual height of the lower limit of its detection; It detects mechanical wave vibration that principle is the CF that sends when leaking of probe gas, this method for and the seepage of trace be helpless.Also have is exactly that the concentration that is directed against particular chemical character gas detects.The limitation of this method is to detect the concentration of specific gas, but can not accurately estimate leakage rate, because the gas that leaks out is difficult to be controlled in certain volume.In addition, for the overwhelming majority do not fire, the nontoxic and insensitive gas of chemical reaction or the present prior art of liquid also can't detect.
Summary of the invention
Deficiency to prior art; The purpose of the utility model is to provide a kind of test macro of seal element tiny leakage amount; This test macro has not only solved the not high problem of traditional leakage rate test system and test precision; Realize fast, precision measurement, satisfy simultaneously the universalization of gas, hydraulic seal element measured, and leakage rate that can accurate Calculation unit interval components and parts.
For realizing above-mentioned purpose; The utility model provides a kind of test macro of seal element tiny leakage amount; Comprise pressure feed system, compression system, voltage-regulating system, pressurize test macro, pressure release security system and complete machine control system; Wherein said pressure feed system is that element to be tested provides the highly pressurised liquid that is higher than test request power; Described compression system is the working environment that element to be tested provides a simulation; Described voltage-regulating system can accurately be adjusted element required pressure difference ring to be tested border; Further approach the working pressure environment of element to be tested; Described pressurize test macro can be calculated the leakage rate of liquid under the pressurize environment through the pressure change of test liquid under the inspection pressurize environment; Described compression system comprises a surplus valve, two pressure transducers, solenoid directional control valve, retaining valve, reservoir, pressure control switch and plurality of pipelines; Described voltage-regulating system comprises two surplus valves, two solenoid directional control valves, a retaining valve, a hydraulic control one-way valve, a pressure transducer, a reservoir, and described pressurize test macro comprises a pressure transducer, a reservoir, a retaining valve, a hydraulic control one-way valve, an observable tensimeter and element to be tested, and described pressure release security system comprises a hydraulic control one-way valve, a solenoid directional control valve, a surplus valve; Said complete machine control system comprises master controller, communication bus and interface circuit and is distributed in various sensors and the electronic control unit in each subsystem parts that the inner various sensors of each subsystem are connected with master controller through interface circuit with electronic control unit.
The detection method of the utility model is following:
The first step is installed in element to be tested on the measuring head, and is fixing, good seal.If element internal to be tested has a lot of air, also need launch the automatic vent function, reach the effect of discharge internal gas through the flushing of test oil.
Second step was set up certain pressure difference with the two ends that element to be tested need seal, and this pressure difference can be adjusted in certain limit as required.
The pipeline of the 3rd step with high-pressure section seals, and is independent of outside high-voltage power supply and do not have the lasting additional of ambient pressure thereby form one.
The pipeline of the 4th step to high-pressure section carries out pressure fall-off test within a certain period of time or in the certain pressure scope.System just is being based on the principle that liquid can the trace compression to the inspection of element leakage rate to be tested.The Liquid Bulk Modulus of Elasticity just inverse of liquid compressible is an important physical quantity describing liquid property; It is an important parameter that characterizes the fluent material mechanical property; It has determined the physical property of a series of fluent materials, and this test macro has utilized this principle just.The compressibility of liquid is all ignored in the ordinary course of things, but in native system, wants accurate Calculation.
The compressible k of liquid:
The elastic modulus of liquid is the inverse of compressible:
Wherein: k is the test oil compressible;
is test oil volume under the packing state;
is components and parts leakage rate to be tested;
is test oil pressure change under the packing state; K is the test oil elastic modulus.
The volume in system inner seal ring border
is that the leakage rate according to the element to be tested estimated designs; The excessive then pressure drop of volume is less than normal, and the too small possible pressure drop of volume is violent.Test oil elastic modulus K can obtain through experiment in the system; System pressure drop
is measured through pressure transducer, and then leakage rate
can calculate:
The beneficial effect of the utility model is: adopt said system; This test macro has not only solved the not high problem of traditional leakage rate test system and test precision; Realize quick, precision measurement; Satisfy simultaneously the universalization of gas, hydraulic seal element is measured, and leakage rate that can accurate Calculation unit interval components and parts.
The pressure source that the utility model can further be set to said pressure feed system can be provided by the variable frequency hydraulic pump that native system carries, and also can be provided by the ambient pressure source through switch.
The utility model also can further be set to be provided with in the described reservoir filtering system, cooling system and position liquid indicating device.
The utility model also can further be set to also comprise leakage reclaim line and filtration unit.
Description of drawings
Fig. 1 is the utility model system synthesis structural representation;
Fig. 2 is the utility model system start-up pattern diagram;
Fig. 3 is the utility model system pattern of pressure synoptic diagram;
Fig. 4 is the utility model system pressure regulation pattern diagram;
Fig. 5 is the utility model system pressurize test pattern synoptic diagram;
Fig. 6 is the utility model system decompression pattern diagram;
Fig. 7 is the utility model system standby pattern diagram.
Wherein: 1 is main fuel tank, and 2 is liquid level gauge, and 3 is the inlet port filtrator, and 4 is thermometer; 5 is motor, and 6 is oil pump, and 7 is surplus valve, and 8 is tensimeter; 9 is the 3-position 4-way Elactro magnetic commutator, and 10 is retaining valve, and 11 is reservoir, and 12 is pressure switch; 13 is hydraulic control one-way valve, and 14 is two four-way electromagnetic reversing valves, and 15 is element to be tested.
Embodiment
The utility model provides a kind of test macro of seal element tiny leakage amount; Comprise pressure feed system, compression system, voltage-regulating system, pressurize test macro, pressure release security system and complete machine control system; Wherein said pressure feed system is that element 15 to be tested provides the highly pressurised liquid that is higher than test request power; Described compression system is the working environment that element 15 to be tested provides a simulation; Described voltage-regulating system can accurately be adjusted element to be tested 15 required pressure difference ring borders; Further approach the working pressure environment of element 15 to be tested; Described pressurize test macro can be calculated the leakage rate of liquid under the pressurize environment through the pressure change of test liquid under the inspection pressurize environment; Described compression system comprises a surplus valve 7, two tensimeters 8,3-position 4-way Elactro magnetic commutator 9, retaining valve 10, reservoir 11, a pressure control switch and a plurality of pipelines; Described voltage-regulating system comprises two surplus valves 7,3-position 4-way Elactro magnetic commutator 9, two four-way electromagnetic reversing valve 14, retaining valve 10, hydraulic control one-way valve 13, tensimeter 8, a reservoir 11; The wherein shared surplus valve of compression system and voltage-regulating system 7, tensimeter 8,3-position 4-way Elactro magnetic commutator 9, retaining valve 10, reservoir 11, a pressure control switch and a respective line; Described pressurize test macro comprises two tensimeters 8, reservoir 11, retaining valve 10, hydraulic control one-way valve 13, element to be tested 15; Described pressure release security system comprises a hydraulic control one-way valve 13, two four-way electromagnetic reversing valve 14, a surplus valve 7; Said complete machine control system comprises master controller, communication bus and interface circuit and is distributed in various sensors and the electronic control unit in each subsystem parts that the inner various sensors of each subsystem are connected with master controller through interface circuit with electronic control unit.The pressure source of said pressure feed system can be provided by the variable frequency hydraulic pump that native system carries, and also can be provided by the ambient pressure source through switch.Be provided with filtering system, cooling system and position liquid indicating device in the described reservoir.Described compression system is regulated by the 3-position 4-way Elactro magnetic commutator 9 of master controller control, and the pressurization degree can be regulated arbitrarily.Said voltage-regulating system pressure regulation threshold value is accomplished by master controller control 3-position 4-way Elactro magnetic commutator 9 and then control hydraulic control one-way valve 13.Described voltage-regulating system comprises return liquid system, is provided with two four-way electromagnetic reversing valves 14 and the surplus valve 7 that prevent system pressure sudden change and pulsation in the described return liquid system.Have only a retaining valve 10 and a hydraulic control one-way valve 13 to be in communication with the outside in the pressure dwelling loop of said pressurize test macro; Avoided the system in the pressure maintaining period from revealing; Improve precision of measurement; Described pressurize test environment has been reserved the adjustable test macro of multiparameter; This system is according to the pressurize sealed volume, and test liquid type and unit interval pressure drop-out value etc. can comprehensively be judged the leakage rate of element 15 to be tested, can also directly use as inspection apparatus if provide acceptance condition; Pressurize test macro volume needs to adjust according to the leakage rate that element 15 to be tested allows, and the purpose of adjustment is more targeted when making parameters such as selecting sensor and tensimeter range.Also be provided with leakage reclaim line and inlet port filtrator 3 in this test macro, can carry out recycling for the test liquid that leaks out element.
The workflow of the utility model is following:
1. startup test macro
As illustrated in fig. 1 and 2 for test macro starts the back principle of work, after the complete machine start button was pressed, the complete machine control system was carried out self check, like the no abnormal start-up routine that then gets into of each system.Start oil pump 6 beginning fuel feeding like liquid level gauge 2 and thermometer 4 no abnormal then motor 5 this moment.It is fixed that motor 5 rotating speeds are required according to the complete machine control system by frequency converter, and it is relatively low to reach energy-conservation purpose in general to start rotating speed.Test gets into the test pipeline with oil through inlet port filtrator 3 and oil pump 6.At this moment, surplus valve 7 is in the not overflow of aperture minimum state, and test oil is road backflow main fuel tank 1 in 3-position 4-way Elactro magnetic commutator 9, and tensimeter is designated as zero.
2. system gets into the pressurized operation state
The schematic diagram that starts entering pressurized state in back for test macro as shown in figs. 1 and 3; Pressurized state is a steps necessary of the whole process of test; When needs are tested element 15 to be tested; Need at first element 15 clampings to be tested to be opened testing button behind measuring head, master controller is accomplished guidance system sequence of operations such as pressurization, pressure regulation, test and pressure release automatically.
After getting into the pressurized operation state, motor 5 is adjusted the pressurization rotating speed automatically according to the pressurization demand, if the test pressure that element in general to be tested 15 requires is high, the pressurization rotating speed is just higher relatively, and test pressure is low, and the pressurization rotating speed is also relatively low.Such design can be shortened the whole test duration effectively, and efficient and energy savings are provided.Under the pressurized state, the spool of 3-position 4-way Elactro magnetic commutator 9 moves to right, and the path that test oil gets into test environment is opened, and Hi-pot test this moment oil has been full of the test environment pipeline.When test oil pressure surpassed preset test pressure value, 3-position 4-way Elactro magnetic commutator 9 moved to left automatic spool, and this moment, test oil was closed towards the passage of test pipeline, and test oil is back to main fuel tank 1 from scavenge pipe.
3. system gets into the pressure regulation state
After pressurized state finished, master controller got into pressure regulation state adjustment test pipeline build-in test oil pressure rapidly with Adjustment System.As shown in figs. 1 and 4 for test macro starts the schematic diagram that the back gets into the pressure regulation state, the motor 5 that pressurizes this moment slowly runs to cut down the consumption of energy and to provide hydraulic control one-way valve 13 kinetic energy simultaneously with the utmost point.3-position 4-way Elactro magnetic commutator 9 spools continue to move to left, and the pressure regulation branch road is opened.According to preset pressure limitation, unnecessary test oil will be overflowed through two four-way electromagnetic reversing valves 14 by hydraulic control one-way valve 13 and will be back to main fuel tank 1 from surplus valve 7.Through the adjustment of hydraulic control one-way valve 13, line pressure is accurately positioned in the required pressure value in the test environment, so that get into next test environment.
4. system gets into the pressurize test mode
This state is that a most important link also is a link that directly draws the qualification conclusion in the whole workflow.Be depicted as test macro like Fig. 1 and 5 and start the schematic diagram that the back gets into the pressurize test mode, the test oil of this moment is by a retaining valve 10 and hydraulic control one-way valve 13 complete closed, and as not considering the leakage of tested components and parts, the leakage rate that requires system self is zero.Under this state, the method for test has two kinds.A kind of test oil pressure drop-out value that is closed with the unit interval is for adhering to standard, and promptly in the unit official hour, in 5 minutes, the drop-out value of hydraulic pressure must be less than certain and just think that in design load system is qualified; Another kind method is to investigate the time required under the situation of decline unit's pressure, promptly in test environment build-in test oil decline unit pressure, the time required like 1bar.
When carrying out work with first kind of method of testing; Master controller picks up counting when test is initial; Require at the appointed time as stop timing 5 minutes the time and measure the drop-out value of liquid pressure according to element to be tested 15, can calculate the leakage rate of element 15 to be tested through top formula easily.Wherein, the elastic modulus of test liquid can or be looked into the handbook acquisition according to experiment.
5. system gets into the pressure release state
After test finishes, after can showing test results, system carries out the pressure release operation automatically so that get into next test link.As shown in figs. 1 and 6 for test macro starts the schematic diagram that the back gets into the pressure release state, the motor 5 that pressurizes this moment slowly runs to cut down the consumption of energy and to provide hydraulic control one-way valve 13 kinetic energy simultaneously with the utmost point.3-position 4-way Elactro magnetic commutator 9 spools move to left, the complete conducting of pressure release branch road, and unnecessary test oil will be overflowed through two four-way electromagnetic reversing valves 14 by hydraulic control one-way valve 13 and will be back to main fuel tank 1 from surplus valve 7.The effect of pressure release operation is to reduce the test environment internal pressure, and element 15 to be tested for convenience detach reduces operational danger.
6. system standby
After pressure release operation, system need to get into a standby environment automatically so that next time test operation can start rapidly.Be depicted as test macro like Fig. 1 and 7 and start the schematic diagram that the back gets into the pressure release state, after the pressure release operation was accomplished, master controller was adjusted into the standby low-power consumption mode with test macro.This moment, motor 5 and oil pump 6 be with idling pump oil, and it is fixed that motor speed is required according to the complete machine control system by frequency converter, lower rotating speed be consider energy-conservation.Test gets into test pipeline through oil through inlet port filtrator 3 and oil pump 6 with oil.At this moment, surplus valve 7 is in the not overflow of aperture minimum state, and test oil is road backflow main fuel tank 1 in 3-position 4-way Elactro magnetic commutator 9, and tensimeter is designated as zero.As need not the use test system for a long time, can directly cut off the power supply for shutting down gets final product.
The superiority of this test macro is the sensitivity of its height.The elastic modulus of test liquid very big all generally, as its K value of oil base test fluid up to 1.4 ~ 2 * 10
3Mpa so instant leakage rate is extremely small, also has been placed to several hundred million times after multiply by K value, is equipped with high-precision pressure sensor again and just can have found out extremely micro-leakage.
In order to improve the accuracy of test macro, necessarily require internal system self sealss property to get well, must not have and leak perhaps from the leakage rate of leakage rate far below element 15 to be tested.In the utility model, specialized designs a retaining valve 10 and 13 pairs of tested formation testings of a hydraulic control one-way valve seal.
Complete machine control system in the utility model will be with pre-set program work, parameter and timing leakage rate situation such as automatic detection time, pressure change, and product more in the past directly detects leakage rate more accurately, efficiently.With the existing compared with techniques that directly detects leak materials, the utility model occupies greater advantage on mechanism.
Claims (4)
1. the test macro of a seal element tiny leakage amount; It is characterized in that: comprise pressure feed system, compression system, voltage-regulating system, pressurize test macro, pressure release security system and complete machine control system; Wherein said pressure feed system is that element to be tested provides highly pressurised liquid power; Described compression system is the working environment that element to be tested provides a simulation; Described voltage-regulating system can accurately be adjusted element required pressure difference ring to be tested border; Further approach the working pressure environment of element to be tested; Described pressurize test macro can be calculated the leakage rate of liquid under the pressurize environment through the pressure change of test liquid under the inspection pressurize environment; Described compression system comprises a surplus valve, two pressure transducers, solenoid directional control valve, retaining valve, reservoir, pressure control switch and plurality of pipelines; Described voltage-regulating system comprises two surplus valves, two solenoid directional control valves, a retaining valve, a hydraulic control one-way valve, a pressure transducer, a reservoir; Described pressurize test macro comprises a pressure transducer, a reservoir, a retaining valve, a hydraulic control one-way valve, an observable tensimeter and element to be tested; Described pressure release security system comprises a hydraulic control one-way valve, a solenoid directional control valve, a surplus valve, and said complete machine control system comprises master controller, communication bus and interface circuit and be distributed in sensor and the electronic control unit in each subsystem parts that the inner sensor of each subsystem is connected with master controller through interface circuit with electronic control unit.
2. the test macro of a kind of seal element tiny leakage amount according to claim 1 is characterized in that: the pressure source of said pressure feed system can be provided by the variable frequency hydraulic pump that native system carries, and also can be provided by the ambient pressure source through switch.
3. the test macro of a kind of seal element tiny leakage amount according to claim 1 is characterized in that: be provided with filtering system, cooling system and position liquid indicating device in the described reservoir.
4. the test macro of a kind of seal element tiny leakage amount according to claim 1 is characterized in that: also comprise leakage reclaim line and filtration unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120149434XU CN202177417U (en) | 2011-05-12 | 2011-05-12 | Test system for micro-leakage amount of sealing element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120149434XU CN202177417U (en) | 2011-05-12 | 2011-05-12 | Test system for micro-leakage amount of sealing element |
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| CN201120149434XU Expired - Fee Related CN202177417U (en) | 2011-05-12 | 2011-05-12 | Test system for micro-leakage amount of sealing element |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851339A (en) * | 2012-12-07 | 2014-06-11 | 韦轶 | System and method for detecting pipeline leakage |
| CN107976223A (en) * | 2017-11-16 | 2018-05-01 | 哈尔滨工业大学 | A kind of high accuracy leakage amount detector |
| CN112303056A (en) * | 2020-11-03 | 2021-02-02 | 山西天地煤机装备有限公司 | Automatic pressure regulating device for safety valve of emulsion pump station and use method of automatic pressure regulating device |
-
2011
- 2011-05-12 CN CN201120149434XU patent/CN202177417U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103851339A (en) * | 2012-12-07 | 2014-06-11 | 韦轶 | System and method for detecting pipeline leakage |
| CN103851339B (en) * | 2012-12-07 | 2016-08-03 | 焦作市盛景科技有限责任公司 | The system and method for detection pipe leakage |
| CN107976223A (en) * | 2017-11-16 | 2018-05-01 | 哈尔滨工业大学 | A kind of high accuracy leakage amount detector |
| CN107976223B (en) * | 2017-11-16 | 2019-07-16 | 哈尔滨工业大学 | A kind of high-precision leakage amount detector |
| CN112303056A (en) * | 2020-11-03 | 2021-02-02 | 山西天地煤机装备有限公司 | Automatic pressure regulating device for safety valve of emulsion pump station and use method of automatic pressure regulating device |
| CN112303056B (en) * | 2020-11-03 | 2022-11-04 | 山西天地煤机装备有限公司 | Automatic pressure regulating device for safety valve of emulsion pump station and using method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120328 Termination date: 20130512 |