CN104215290A - Differential-pressure type volume detection device and detection method - Google Patents
Differential-pressure type volume detection device and detection method Download PDFInfo
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Abstract
The invention provides a differential-pressure type volume detection device and a detection method. The differential-pressure type volume detection device comprises a leakage detection unit, a standard leakage hole group and a control unit, wherein the leakage detection unit comprises an air inlet pipeline, a detected pipeline, a standard pipeline and a differential-pressure sensor, the air inlet pipeline is respectively connected with the two ends of the differential-pressure sensor through a valve body group, one end of the air inlet pipeline is also communicated with the tested pipeline, the other end of the air inlet pipeline is communicated with the reference pipeline, the standard leakage hole group comprises a plurality of standard leakage holes with different leakage rates, each standard leakage hole is respectively communicated with the tested pipeline in an openable and closeable way, and the control unit is respectively and electrically connected with the valve body group, the differential-pressure sensor and the standard leakage hole group. The device and the method provided by the invention have the advantages that the volume value of different specifications can be detected at high precision, small leakage is allowed for gas passage connection, in addition, a tested object during the volume detection can be ordinary small leakage workpieces, and meanwhile, when the detection method of the device can be matched for being effectively applied to the device for accelerating the detection speed and improving the detection effect.
Description
Technical field
The invention belongs to and measure volume field, especially relate to a kind of differential pressure type device for measuring volume and detection method.
Background technology
At present, in the volume measurement method of the airtight leak locator of differential pressure type, wherein one is referance leak venting method, first test pressure P
tinflate and after balance, record pressure drop (differential pressure) the Δ P produced in Δ T detection time, using the Ideal-Gas Equation
the volume size of measured object can be calculated.
But can limit due to the level of operating personnel in actual use, the gas circuit of connection may produce the small leakage but can not ignored, and affects the precision of volume measurement; Meanwhile, the measured object that detection volume uses also must be accomplished to leak the little degree to ignoring, otherwise equally with gas-path leakage can have an impact to accuracy of detection.On the other hand, the airtight leak locator of differential pressure type due to existing volume measurement is only built-in 1 referance leak, the scope of its volume measurement is subject to the restriction of referance leak, if detection volume is large relative to referance leak, the pressure drop Δ P produced is smaller, thus affects accuracy of detection, but if detection volume is relatively little, the pressure drop Δ P produced easily exceeds the sensing range of differential pressure pick-up, causes and does not measure this volume.If when adopting referance leak externally positioned type more in other words, operating personnel are just needed to select suitable small opening access gas circuit to detect according to the estimation volume of measured object, if select inappropriate words also accuracy of detection can be affected, so there is certain requirement to the technical merit of operating personnel.
So, present needs are developed a kind of volume measurement and are had a wide reach and ensure high precision, simultaneously at utmost can also ignore other reasons and the differential pressure type device for measuring volume that produces error and the proposition that utilizes this device to carry out the detection method of volume measurement are problem demanding prompt solutions.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of high precision and can detects the differential pressure type device for measuring volume of many specifications volume.
For solving the problems of the technologies described above, the technical solution used in the present invention is: differential pressure type device for measuring volume, it comprises a leak detection unit, referance leak group and control module, described leak detection unit comprises an air inlet pipeline, tested pipeline, benchmark pipeline and differential pressure pick-up, this air inlet pipeline is connected with the two ends of differential pressure pick-up respectively by a valve body group, and its one end also with tested pipeline connection, the other end and benchmark pipeline connection;
Described referance leak group comprises the referance leak of several different leak rate, and each referance leak all can be communicated with tested pipeline in opening and closing;
Described control module is electrically connected with valve body group, differential pressure pick-up and referance leak group respectively.
Further, described air inlet pipeline is also connected with a pressure transducer, and this pressure transducer is electrically connected with control module.
Further, described valve body group comprises Air inflating and exhausting valve and the equalizing valve of a two-bit triplet, the air intake opening of described Air inflating and exhausting valve is connected with air inlet pipeline, and its gas outlet is connected respectively by equalizing valve with tested pipeline and benchmark pipeline, and described Air inflating and exhausting valve and equalizing valve are all electrically connected with control module.
Further, described Air inflating and exhausting valve is two-bit triplet valve body, and described equalizing valve is 2/2-way valve body.
Further, described referance leak is all by a switch valve and tested pipeline connection, and described switch valve is electrically connected with control module.
Further, the control module display screen that comprises control module and be connected with its signal.
Separately, a kind of being mated and efficient detection method of carrying out volume measurement is fast provided according to above-mentioned mentioned differential pressure type device for measuring volume.
Said apparatus is utilized to carry out the detection method of volume measurement as follows:
The first step, the non-link of tested pipeline and benchmark pipeline is communicated with measured object and primary standard substance respectively, and described air inlet pipeline is connected with source of the gas;
Second step, the switch valve corresponding to referance leak that control module controls minimum leak rate is opened;
3rd step, controls Air inflating and exhausting valve and two equalizing valves and opens, and controls Air inflating and exhausting valve and open, thus starts after being switched to gas fill port to inflate measured object and primary standard substance;
4th step, control module controls equalizing valve and closes, and through the time link of presetting balance and detection, within detection time, differential pressure pick-up detects and opening the differential pressure produced under Current standards small opening, and passes to control module record by electric signal;
5th step, control module controls equalizing valve and opens, and closes the air intake opening of Air inflating and exhausting valve, thus is switched to exhaust channel, and the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve;
6th step, control module detects whether produced differential pressure reaches specialized range value, if value range against regulation, control current switch valve and close and open switch valve corresponding to the slightly large referance leak of next leak rate, return the detecting step that the 3rd step restarts below, until find differential pressure to conform with the regulations a referance leak of value range, if conform with the regulations value range, carry out the 7th step;
7th step, controls to close switch valve corresponding to all referance leaks, closes equalizing valve, then carry out the 8th step after only repeating the 3rd step;
8th step, differential pressure pick-up detect within identical detection time without the differential pressure under referance leak, and pass to control module record by electric signal;
9th step, shows the volume numerical value of detection by the display screen of controller.
Further, specialized range value is between 30%F.S. to the 70%F.S. of differential pressure pick-up measurement range.
Further, control module preserves pressure and the leak rate curve of referance leak group, by the test pressure under pressure transducer testing state, and is calculated the leak rate of the referance leak of the current connection of current test pressure to control module by signal transmission.
Further, control module carries out the 6th step when detecting the referance leak conformed with the regulations, and the connection for referance leak all detects successively according to its leak rate.
The advantage that the present invention has and good effect are: differential pressure type device for measuring volume high-precisionly can detect the volumetric values of different size, gas circuit is pipeline and connects and can allow Small leak, and measured object during detection volume can be the workpiece of common Small leak; The detection method simultaneously coordinating this device to produce effectively can apply this device to improve its detection rates and effect.
Accompanying drawing explanation
Fig. 1 is circuit of the present invention, gas circuit connection layout.
In figure:
1, pressure transducer 2, control module 3, Air inflating and exhausting valve
4, the first equalizing valve 5, second equalizing valve 6, differential pressure pick-up
7, the first referance leak 8, first switch valve 9, second referance leak
10, second switch valve 11, the 3rd referance leak 12, the 3rd switch valve
13, measured object 14, primary standard substance 15, tested pipeline
16, benchmark pipeline 17, air inlet pipeline
Represented by dotted arrows circuit in figure, solid line represents gas circuit.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.
As shown in Figure 1, differential pressure type device for measuring volume, it comprises a leak detection unit, referance leak group and control module 2, described leak detection unit comprises an air inlet pipeline 17, tested pipeline 15, benchmark pipeline 16 and differential pressure pick-up 6, this air inlet pipeline 17 is connected with the two ends of differential pressure pick-up 6 respectively by a valve body group, and its one end is also communicated with tested pipeline 15, the other end is communicated with benchmark pipeline 16, described valve body group comprises the Air inflating and exhausting valve 3 of a two-bit triplet and the first equalizing valve 4 of 2/2-way, second equalizing valve 5, the air intake opening of described Air inflating and exhausting valve 3 is connected with air inlet pipeline 17, its gas outlet is connected respectively by the first equalizing valve 4 and the second equalizing valve 5 with tested pipeline 15 and benchmark pipeline 16, described Air inflating and exhausting valve 3 and equalizing valve 4, 5 are all electrically connected with control module 2,
Described referance leak group comprises the first referance leak 7, second referance leak 9, the 3rd referance leak 11 of several different leak rate, and each referance leak is communicated with tested pipeline 15 respectively by the first switch valve 8, second switch valve 10, the 3rd switch valve 12;
Described air inlet pipeline 17 is also connected with a pressure transducer 1, and this pressure transducer 1 is electrically connected with control module 2;
Described control module 2 respectively with switch valve 8,10,12, valve body group, differential pressure pick-up 6 and the electrical connection of referance leak group, and the display screen that this control module 2 comprises control module and is connected with its signal.
Its principle of work is exactly the volume using the airtight detector of differential pressure type to detect measured object 13, this measured object 13 is connected one end of tested pipeline 15, and the other end of this tested pipeline 15 is connected with the first equalizing valve 4, primary standard substance 14 as measuring basis is then connected to one end of benchmark pipeline 16, the other end of this benchmark pipeline 16 connects the second equalizing valve 5, and is connected by a differential pressure pick-up 6 with between benchmark pipeline 16 at tested pipeline 15.
And it is as follows specifically to utilize this device to carry out the detection method of volume measurement:
Set the first referance leak 7, second referance leak 9 in embodiment, the leak rate Q of the 3rd referance leak 11 increases successively;
And in control module 2, preserve pressure and the leak rate curve of referance leak group, recording current test pressure P
twhen can calculate the leak rate Q of corresponding referance leak.
The first step, the non-link of tested pipeline 15 and benchmark pipeline 16 is communicated with measured object 13 and primary standard substance 14 respectively, and described air inlet pipeline 17 is connected with source of the gas, and opens pressure transducer 1, by the test pressure P under this pressure transducer 1 testing state
t, and pass to control module 2 by electric signal, monitoring duty keeps set pressure;
The setting of this pressure transducer 1 can control the test pressure P that duty is regulation exactly
t, thus ensure the precision of measurement.
Second step, the switch valve corresponding to referance leak that control module 2 controls minimum leak rate Q is opened, and the first switch valve 8 being the first referance leak 7 correspondence is opened, and accomplishes being communicated with of the first referance leak 7 and tested pipeline 15;
3rd step, controls Air inflating and exhausting valve 3 and two equalizing valves 4,5 are opened, and control Air inflating and exhausting valve 3 is opened subsequently, thus is switched to gas fill port, and starts to inflate measured object 13 and primary standard substance 14;
4th step, control module 2 controls equalizing valve 4, and 5 close, and in presetting detection time △ T, and differential pressure sensing 6 returns to control module 2 record by electric signal detecting opening the differential pressure A that the first referance leak produces for 7 times;
5th step, control module 2 controls equalizing valve 4, and 5 open, and closes the air intake opening of Air inflating and exhausting valve 3, thus is switched to exhaust channel, and the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve 3;
6th step, control module 2 detects whether produced differential pressure A reaches specialized range value, between 30%F.S. to the 70%F.S. being differential pressure pick-up 6 measurement range, reality is exactly be to ensure that differential pressure pick-up 6 uses at the interlude that its linear precision is good, improve volume measurement precision, and the differential pressure of the less generation of the volume of measured object 13 will be larger, otherwise it is then less, if value range against regulation, gauge tap valve cuts out and opens switch valve corresponding to the slightly large referance leak of next leak rate Q successively according to its leak rate Q, be the second switch valve 10 of the second referance leak 9 correspondence, return the detecting step that the 3rd step restarts below, until find differential pressure A to conform with the regulations a referance leak of value range, if conform with the regulations value range, carry out the 7th step,
7th step, controls to close switch valve corresponding to all referance leaks, closes equalizing valve 4,5, then carry out the 8th step after only repeating the 3rd step;
8th step, the differential pressure B without referance leak that differential pressure pick-up 6 detected in △ T in identical detection time by Signal transmissions to control module 2 record;
9th step, control module 2 passes through the mathematic interpolation volumetric values of the 4th step and the 8th step record data, is shown by display screen.
Control module is exactly basis
calculate, wherein V=volume; The detection time that Δ T=is presetting; The leak rate of respective standard small opening under Q=test pressure Pt, by control module 2 according to test pressure P
tcalculate with the leak rate opisometer stored; P
0=atmospheric pressure; Δ P=pressure drop (differential pressure); And Δ P=A-B, A is differential pressure numerical value when being communicated with referance leak detected by differential pressure pick-up, B is the differential pressure numerical value that differential pressure pick-up when not being communicated with referance leak detects, because pressure drop Δ P subtracts each other according to two differential pressures to obtain, so the detection impact produced when gas circuit and measured object having leakage just can be offset.
Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the scope of the invention change and improve, and all should still belong within this patent covering scope.
Claims (10)
1. differential pressure type device for measuring volume, it is characterized in that: it comprises a leak detection unit, referance leak group and control module (2), described leak detection unit comprises an air inlet pipeline (17), tested pipeline (15), benchmark pipeline (16) and differential pressure pick-up (6), this air inlet pipeline (17) is connected respectively by the two ends of a valve body group with differential pressure pick-up (6), and its one end is also communicated with tested pipeline (15), the other end is communicated with benchmark pipeline (16);
Described referance leak group comprises the referance leak (7,9,11) of several different leak rate, and each referance leak all can be communicated with tested pipeline (16) in opening and closing;
Described control module (2) respectively with the electrical connection of valve body group, differential pressure pick-up (6) and referance leak group.
2. differential pressure type device for measuring volume according to claim 1, it is characterized in that: described air inlet pipeline (17) is also connected with a pressure transducer (1), this pressure transducer (1) is electrically connected with control module (2).
3. differential pressure type device for measuring volume according to claim 1, it is characterized in that: described valve body group comprises Air inflating and exhausting valve (3) and the equalizing valve (4 of a two-bit triplet, 5), the air intake opening of described Air inflating and exhausting valve (3) is connected with air inlet pipeline (17), its gas outlet and tested pipeline (15) and benchmark pipeline (16) are respectively by equalizing valve (4,5) connect, described Air inflating and exhausting valve (3) and equalizing valve (4,5) are all electrically connected with control module (2).
4. differential pressure type device for measuring volume according to claim 3, is characterized in that: described Air inflating and exhausting valve (3) is two-bit triplet valve body, and described equalizing valve (4,5) is 2/2-way valve body.
5. the differential pressure type device for measuring volume according to claim 1 or 4, it is characterized in that: described referance leak (7,9,11) all by a switch valve (8,10,12) be communicated with tested pipeline (15), described switch valve (8,10,12) be electrically connected with control module (2).
6. according to the differential pressure type device for measuring volume wherein described in claim 1-3, it is characterized in that: the display screen that control module (2) comprises control module and is connected with its signal.
7. utilize the differential pressure type device for measuring volume described in claim 1 to carry out the detection method of volume measurement, it is characterized in that:
The first step, the non-link of tested pipeline (15) and benchmark pipeline (16) is communicated with measured object (13) and primary standard substance (14) respectively, and described air inlet pipeline (17) is connected with source of the gas;
Second step, the switch valve corresponding to referance leak that control module (2) controls minimum leak rate is opened;
3rd step, control module (2) controls two equalizing valves (4,5) open, and control Air inflating and exhausting valve (3) and open, thus start after being switched to gas fill port to inflate measured object (13) and primary standard substance (14);
4th step, control module (2) controls equalizing valve (4,5) close, through the time link of presetting balance and detection, within detection time, differential pressure pick-up (6) detects and is opening the differential pressure produced under Current standards small opening, and passes to control module (2) record by electric signal;
5th step, control module (2) controls equalizing valve (4,5) open, and close the air intake opening of Air inflating and exhausting valve (3) thus be switched to exhaust channel, the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve (3);
6th step, control module (2) detects whether produced differential pressure reaches specialized range value, if value range against regulation, control current switch valve and close and open switch valve corresponding to the slightly large referance leak of next leak rate, return the detecting step that the 3rd step restarts below, until find differential pressure to conform with the regulations a referance leak of value range, if conform with the regulations value range, carry out the 7th step;
7th step, controls to close switch valve corresponding to all referance leaks, closes equalizing valve (4,5), then carry out the 8th step after only repeating the 3rd step;
8th step, differential pressure pick-up (6) detect within identical detection time without the differential pressure under referance leak, and pass to control module (2) record by electric signal;
9th step, shows the volume numerical value of detection by the display screen of controller.
8. detection method according to claim 7, is characterized in that: specialized range value is between 30%F.S. to the 70%F.S. of differential pressure pick-up (6) measurement range.
9. the detection method according to claim 7 or 8, it is characterized in that: control module (2) preserves pressure and the leak rate curve of referance leak group, by the test pressure under pressure transducer (1) testing state, and pass to control module (2) by electric signal, and calculate the leak rate of the referance leak of the current connection of current test pressure.
10. the detection method according to claim 7 or 8, is characterized in that: carry out the 6th step when detecting the referance leak conformed with the regulations, the connection for referance leak all detects successively according to its leak rate.
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| CN108007652A (en) * | 2017-12-02 | 2018-05-08 | 天津博益气动股份有限公司 | A kind of airtight leak detector of the differential pressure type of multichannel and leak hunting method |
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| 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 |
| CN109813387A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of method of rapid survey cavity volume |
| CN112098305A (en) * | 2020-11-04 | 2020-12-18 | 天津博益气动股份有限公司 | Detection device and method for waterproof detection of waterproof breathable film |
| CN112484942A (en) * | 2020-11-30 | 2021-03-12 | 航天特种材料及工艺技术研究所 | Method and system for measuring leakage rate of small-volume container |
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