CN203024944U - High-precision differential pressure type air tightness leak detector - Google Patents

High-precision differential pressure type air tightness leak detector Download PDF

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Publication number
CN203024944U
CN203024944U CN 201220638034 CN201220638034U CN203024944U CN 203024944 U CN203024944 U CN 203024944U CN 201220638034 CN201220638034 CN 201220638034 CN 201220638034 U CN201220638034 U CN 201220638034U CN 203024944 U CN203024944 U CN 203024944U
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CN
China
Prior art keywords
stop valve
valve
differential pressure
exhaust
air intake
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Application number
CN 201220638034
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Chinese (zh)
Inventor
刘立君
梁雅智
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天津俞昌科技有限公司
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Abstract

The utility model discloses a high-precision differential pressure type air tightness leak detector. The high-precision differential pressure type air tightness leak detector comprises an intake and exhaust control valve, a first and a second check valves, and a differential pressure sensor, wherein the intake and exhaust control valve comprises an intake port, an exhaust port, and an output port communicated with the intake port or the exhaust port under control; the output port of the intake and exhaust control valve is respectively connected with the intake ports of both the first check valve and the second check valve; the differential pressure sensor is connected between the exhaust port of the first check valve and the exhaust port of the second check valve; the detector also comprises a third to a sixth check valves; the exhaust port of the first check valve is also connected with the intake port of the third check valve; the exhaust port of the third check valve is respectively connected with the intake port of the fifth check valve and a detected object containing cavity; the exhaust port of the second check valve is connected with the intake port of the fourth check valve; and the exhaust port of the fourth check valve is respectively connected with the intake port of the sixth check valve and a reference object containing cavity. The high-precision differential pressure type air tightness leak detector provided by the utility model is suitable for air tightness detection under severe conditions, and can ensure the measurement precision.

Description

A kind of high precision differential pressure type impermeability leak locator

Technical field

The utility model relates to a kind of impermeability leak locator, particularly a kind of high precision differential pressure type impermeability leak locator.

Background technology

The continuous progress of modern production, detection means has been proposed more and more higher requirement, the impermeability detection is a kind of as detection mode, play a part more and more important at aspects such as guaranteeing product quality, concerning the product of being strict with sealing, if in use occur to leak and leakage rate has surpassed allowed band, the reliability, economy etc. of product will be affected directly, also but fire hazard, blast, harmful gas such as overflow at the serious consequence, cause irremediable loss.Domestic air-tightness detection method existing and commonly used mainly contains following several: water inspection method, hydrometry, helium method, direct press type detection method and differential pressure type detection method etc.wherein water is examined method and hydrometry etc., and precision and efficiency of detecting is lower, and the human factor impact is larger, can't realize that automatic ration leaks hunting, another kind of direct press type detects the impact that rule is subjected to the sensor manufacturing technology, the precision of its sensor is demarcated with whole range, be generally between 5/2/1000ths~thousand, the sensor absolute error that its total range is larger is also larger, at some automobile components (as car brake pump, the front and back vehicle bridge, engine cylinder cover etc.) in measuring process, when measuring under awp or under the pressure near duty, gaging pressure reaches several MPas, the total measuring error of measuring system will reach even tens of kPas of thousands of handkerchiefs, measuring error can't satisfy actual needs too greatly, the differential pressure type detection method, from having one with reference to cavity volume (also claiming the primary standard substance cavity volume) in system, and system under test (SUT) namely detects the thing cavity volume for another cavity volume, adopt an in check valve that these two cavity volumes are linked up, when simultaneously they being inflated, their pressure is consistent, then close communicating valve, standing one after the meeting, because the standard cavity volume is totally-enclosedly can not leak, therefore its pressure is charge pressure, if have leakage pressure drop will occur and detect the thing cavity volume, its pressure drop amplitude increases and increases along with leakage rate, adopt the pressure differential at sensor measurement these two ends, during because of general little leakage, pressure reduction is less, therefore can select the sensor of a micro-range to measure (being generally between 5~300KPa), significantly reduction because of total range, absolute resolution and measuring accuracy improve relatively, be generally ± 1~± 20Pa between, and, the differential pressure type detection method is identical with the environment temperature of living in of measured piece due to the normative reference part, reduced the impact of environment temperature on measurement result, so increasing air-leakage detector adopts the differential pressure type detection method.

common differential pressure type impermeability leak locator in the market, when product being carried out the sealing leak detection, its inflation gas circuit and exhaust gas circuit overlap, product is being carried out after Leak Detection completes, being filled with the pressurized air that detects in thing can discharge through differential pressure type impermeability leak locator, meanwhile, oil in product, water, the impurity such as foreign matter also can be brought into instrument internal, oil in testing product like this, water, dust, the foreign matters such as chip can be attached in last exhaust process on the surface of instrument internal parts such as sensor, cause core component such as differential pressure pick-up to damage, so general leak locator requires very high to the cleanliness factor of product, must be without oil, anhydrous, foreign, very clean working environment, otherwise the accuracy of detection of instrument and serviceable life all can be had a strong impact on, so present differential pressure type impermeability leak locator should not use under the relatively abominable condition of the working environments such as casting.

Summary of the invention

The utility model can be suitable for abominable testing environment and keep measuring accuracy and the high precision differential pressure type impermeability leak locator in serviceable life for the technical matters that exists in the solution known technology provides a kind of.

the technical scheme that the utility model is taked for the technical matters that exists in the solution known technology is: a kind of high precision differential pressure type impermeability leak locator, comprise the intake and exhaust operation valve, the first stop valve, the second stop valve and differential pressure pick-up, described intake and exhaust operation valve comprises air intake opening, exhausr port and delivery outlet controlled and air intake opening or exhausr port conducting, the air intake opening of described intake and exhaust operation valve is connected with source of the gas, the delivery outlet of described intake and exhaust operation valve respectively with the air intake opening of described the first stop valve be connected the air intake opening of the second stop valve and be connected, connect described differential pressure pick-up between the gas outlet of the gas outlet of described the first stop valve and described the second stop valve, also comprise the 3rd stop valve, the 4th stop valve, the 5th stop valve and the 6th stop valve, the gas outlet of described the first stop valve also is connected with the air intake opening of described the 3rd stop valve, the gas outlet of described the 3rd stop valve respectively with the air intake opening of described the 5th stop valve be connected the thing cavity volume and be connected, the gas outlet of described the second stop valve also is connected with the air intake opening of described the 4th stop valve, the gas outlet of described the 4th stop valve is connected with the primary standard substance cavity volume with the air intake opening of described the 6th stop valve respectively.

The utility model can also adopt following technical scheme:

Described intake and exhaust operation valve is the two-bit triplet reversal valve.

Described the first stop valve, described the second stop valve, described the 3rd stop valve, described the 4th stop valve, described the 5th stop valve and described the 6th stop valve are electromagnet cut off valve.

Advantage and the good effect that the utlity model has are: by setting up the 3rd stop valve, the 4th stop valve, the 5th stop valve and the 6th stop valve, with hardware line isolation inside and outside detector, detect gas and divide two-way to discharge.detection gas in sensor is always clean pressurized air, make the sensor can be by extraneous dust granules, water, the wet goods foreign matter is infected with, guaranteed the sensor long-term stable operation, detect the detection gas in thing cavity volume and primary standard substance cavity volume, discharge by the 5th stop valve and the 6th stop valve, even detect thing and testing environment very severe, various impurity, foreign matters etc. also can not be brought into the inside of instrument and detect gas circuit, can reduce stained to sensor, the measuring accuracy that keeps instrument, improve instrument in the serviceable life of detecting under the mal-condition such as unclean detection thing, prevent from causing accuracy of detection to reduce because measured object pollutes instrument, the utility model still can carry out high precision in abominable working environment, the Leak Detection of high stability.

Description of drawings

Fig. 1 is the structural representation of existing impermeability leak locator;

Fig. 2 is structural representation of the present utility model;

Gas flow schematic diagram when Fig. 3 is the utility model inflation;

Gas flow schematic diagram when Fig. 4 is the utility model exhaust.

In figure: 1, intake and exhaust operation valve, the 2, first stop valve, the 3, second stop valve, the 4, the 3rd stop valve, the 5, the 4th stop valve, the 6, the 5th stop valve, the 7, the 6th stop valve, 8, detect the thing cavity volume, 9, the primary standard substance cavity volume, 10, differential pressure pick-up.

Embodiment

For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:

see also Fig. 2~Fig. 4, a kind of high precision differential pressure type impermeability leak locator, comprise intake and exhaust operation valve 1, the first stop valve 2, the second stop valve 3 and differential pressure pick-up 10, described intake and exhaust operation valve 1 comprises air intake opening, exhausr port and delivery outlet controlled and air intake opening or exhausr port conducting, the air intake opening of described intake and exhaust operation valve 1 is connected with source of the gas, the delivery outlet of described intake and exhaust operation valve 1 respectively with the air intake opening of described the first stop valve 2 be connected the air intake opening of the second stop valve 3 and be connected, connect described differential pressure pick-up 10 between the gas outlet of the gas outlet of described the first stop valve 2 and described the second stop valve 3, the utility model also comprises the 3rd stop valve 4, the 4th stop valve 5, the 5th stop valve 6 and the 6th stop valve 7, the gas outlet of described the first stop valve 2 also is connected with the air intake opening of described the 3rd stop valve 4, the gas outlet of described the 3rd stop valve 4 respectively with the air intake opening of described the 5th stop valve 6 be connected thing cavity volume 8 and be connected, the gas outlet of described the second stop valve 3 also is connected with the air intake opening of described the 4th stop valve 5, the gas outlet of described the 4th stop valve 5 is connected with primary standard substance cavity volume 9 with the air intake opening of described the 6th stop valve 7 respectively.

Described intake and exhaust operation valve 1 can be the two-bit triplet reversal valve.

Described the first stop valve 2, described the second stop valve 3, described the 3rd stop valve 4, described the 4th stop valve 5, described the 5th stop valve 6 and described the 6th stop valve 7 all can be electromagnet cut off valve.

Principle of work of the present utility model:

Please refer to the i.e. structural representation of existing impermeability leak locator of Fig. 1, existing impermeability leak locator only has intake and exhaust operation valve 1, the first stop valve 2, the second stop valve 3, is responsible for the control of instrument internal pipeline break-make, wherein:

Aeration phase: intake and exhaust operation valve 1, the first stop valve 2, the second stop valve 3 are all opened conducting, and to detecting thing cavity volume 8, primary standard substance cavity volume 9 and differential pressure pick-up 10 inflations, intake and exhaust this moment operation valve 1 is in inflated condition, its air intake opening and delivery outlet conducting.

The balance detection stage: the first stop valve 2, the second stop valve 3 all are in cut-off state, measure by differential pressure pick-up 10, and intake and exhaust this moment operation valve 1 are in exhaust condition, its exhausr port and delivery outlet conducting.

Exhaust phase: the first stop valve 2, the second stop valve 3 are all opened conducting, the detection gas that detects in thing cavity volume 8, primary standard substance cavity volume 9 and differential pressure pick-up 10 is discharged, intake and exhaust this moment operation valve 1 is in exhaust condition, and its exhausr port and delivery outlet conducting make detection gas discharge along path.Detect like this in the thing cavity volume and the foreign matters such as the moisture in testing environment, impurity particle, dust are easy to enter into the detecting instrument internal duct and detecting sensor is inner, make pipe blocking, dirt is attached on sensor, easily cause the sensor accuracy of detection to descend, also can cause sensor and other parts damages etc. when serious.

See also Fig. 2~Fig. 4, the utility model has increased the 3rd stop valve 4, the 4th stop valve 5, the 5th stop valve 6 and the 6th stop valve 7 on the basis of existing technology, controls that software industry is corresponding to be redesigned, wherein:

Aeration phase: intake and exhaust operation valve 1, the first stop valve 2, the second stop valve 3, the 3rd stop valve 4, the 4th stop valve 5 are opened conducting, the 5th stop valve 6 and the 6th stop valve 7 are closed cut-off, to detecting thing cavity volume 8, primary standard substance cavity volume 9 and differential pressure pick-up 10 inflations, intake and exhaust this moment operation valve 1 is in inflated condition, its air intake opening and delivery outlet conducting.

The balance detection stage: the 3rd stop valve 4, the 4th stop valve 5 are opened conducting, the first stop valve 2, the second stop valve 3, the 5th stop valve 6 and the 6th stop valve 7 are all closed cut-off, measure by differential pressure pick-up 10, intake and exhaust this moment operation valve 1 is in exhaust condition, i.e. conducting between its exhausr port and delivery outlet.

Exhaust phase: the 3rd stop valve 4, the 4th stop valve 5 are closed cut-off, and the first stop valve 2, the second stop valve 3, the 5th stop valve 6 and the 6th stop valve 7 are opened conducting, and intake and exhaust this moment operation valve 1 is in exhaust condition, its exhausr port and delivery outlet conducting.make and detect thing cavity volume 8, detection gas in primary standard substance cavity volume 9 is discharged by the 5th stop valve 6 and the 6th stop valve 7 valves respectively, and the detection gas flow of sensor and detecting instrument inside is through the first stop valve 2, the second stop valve 3, discharge from intake and exhaust operation valve 1, like this with hardware line isolation inside and outside detector, detecting gas divides two-way to discharge, detection gas in sensor is always clean pressurized air, make the sensor can be by extraneous dust granules, water, the wet goods foreign matter is infected with, guaranteed the sensor long-term stable operation, detect thing cavity volume 8, detection gas in primary standard substance cavity volume 9, discharge by the 5th stop valve 6 and the 6th stop valve 7 valves respectively, even detect thing cavity volume 8, primary standard substance cavity volume 9 dirty and and the testing environment very severe, various impurity, foreign matters etc. also can not be brought into the detection of instrument, can reduce stained to sensor, improve instrument in the serviceable life of detecting under the mal-condition such as unclean detection thing, prevent from causing accuracy of detection to reduce because measured object pollutes instrument.

Although the above is described preferred embodiment of the present utility model by reference to the accompanying drawings; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away from the scope situation that the utility model aim and claim protect, can also make a lot of forms, within these all belong to protection domain of the present utility model.

Claims (3)

1. high precision differential pressure type impermeability leak locator, comprise the intake and exhaust operation valve, the first stop valve, the second stop valve and differential pressure pick-up, described intake and exhaust operation valve comprises air intake opening, exhausr port and delivery outlet controlled and air intake opening or exhausr port conducting, the air intake opening of described intake and exhaust operation valve is connected with source of the gas, the delivery outlet of described intake and exhaust operation valve respectively with the air intake opening of described the first stop valve be connected the air intake opening of the second stop valve and be connected, connect described differential pressure pick-up between the gas outlet of the gas outlet of described the first stop valve and described the second stop valve, it is characterized in that, also comprise the 3rd stop valve, the 4th stop valve, the 5th stop valve and the 6th stop valve, the gas outlet of described the first stop valve also is connected with the air intake opening of described the 3rd stop valve, the gas outlet of described the 3rd stop valve respectively with the air intake opening of described the 5th stop valve be connected the thing cavity volume and be connected, the gas outlet of described the second stop valve also is connected with the air intake opening of described the 4th stop valve, the gas outlet of described the 4th stop valve is connected with the primary standard substance cavity volume with the air intake opening of described the 6th stop valve respectively.
2. high precision differential pressure type impermeability leak locator according to claim 1, is characterized in that, described intake and exhaust operation valve is the two-bit triplet reversal valve.
3. high precision differential pressure type impermeability leak locator according to claim 1, it is characterized in that, described the first stop valve, described the second stop valve, described the 3rd stop valve, described the 4th stop valve, described the 5th stop valve and described the 6th stop valve are electromagnet cut off valve.
CN 201220638034 2012-11-27 2012-11-27 High-precision differential pressure type air tightness leak detector CN203024944U (en)

Priority Applications (1)

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CN 201220638034 CN203024944U (en) 2012-11-27 2012-11-27 High-precision differential pressure type air tightness leak detector

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Application Number Priority Date Filing Date Title
CN 201220638034 CN203024944U (en) 2012-11-27 2012-11-27 High-precision differential pressure type air tightness leak detector

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104236820A (en) * 2014-09-29 2014-12-24 天津博益气动股份有限公司 Differential pressure type airtightness detecting instrument and device for detecting large-sized objects
CN108562411A (en) * 2018-04-24 2018-09-21 合肥邦立电子股份有限公司 A kind of anhydrous air-leakage detector of rigid product
CN108645577A (en) * 2018-07-18 2018-10-12 歌尔股份有限公司 A kind of air tightness testing method of box body
CN109238597A (en) * 2018-10-16 2019-01-18 华中科技大学 A kind of detection method of differential pressure type air-tightness leakage detection apparatus and its leakage flow
CN109282951A (en) * 2018-08-28 2019-01-29 上海空间电源研究所 Zinc-silver oxide cell multichannel monomer sealing propertytest principle and plugging structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104236820A (en) * 2014-09-29 2014-12-24 天津博益气动股份有限公司 Differential pressure type airtightness detecting instrument and device for detecting large-sized objects
CN108562411A (en) * 2018-04-24 2018-09-21 合肥邦立电子股份有限公司 A kind of anhydrous air-leakage detector of rigid product
CN108645577A (en) * 2018-07-18 2018-10-12 歌尔股份有限公司 A kind of air tightness testing method of box body
CN109282951A (en) * 2018-08-28 2019-01-29 上海空间电源研究所 Zinc-silver oxide cell multichannel monomer sealing propertytest principle and plugging structure
CN109238597A (en) * 2018-10-16 2019-01-18 华中科技大学 A kind of detection method of differential pressure type air-tightness leakage detection apparatus and its leakage flow

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