CN104215406A - Wide-range flow-type leak detector and detection method thereof - Google Patents
Wide-range flow-type leak detector and detection method thereof Download PDFInfo
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- CN104215406A CN104215406A CN201410464840.3A CN201410464840A CN104215406A CN 104215406 A CN104215406 A CN 104215406A CN 201410464840 A CN201410464840 A CN 201410464840A CN 104215406 A CN104215406 A CN 104215406A
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Abstract
The invention provides a wide-range flow-type leak detector and a detection method thereof. The wide-range flow-type leak detector comprises at least two detection air channel units, wherein each detection air channel unit comprises a front detection valve, a laminar flow tube and a rear detection valve, and further comprises a signal acquisition-air channel switchover unit which is mainly composed of a differential pressure sensor and two electromagnetic valves, wherein the front end of the differential pressure sensor is connected with one electromagnetic valve; the electromagnetic valve is connected with the front port of the laminar flow tube of each detection air channel unit; the rear port of the differential pressure sensor is connected with the other electromagnetic valve; the electromagnetic valve is connected with the rear port of the laminar flow tube of each detection air channel unit. The invention further provides a flow detection method of the leak detector. Switching for the detection air channel units is realized by switching the laminar flow tubes of the adjacent detection air channel units with repeated intervals in a detection range in a manner of Schmidt trigger. The wide-range flow-type leak detector provided by the invention has the advantages of being wide in detection range, low in purchase cost, high in detection efficiency, and the like.
Description
Technical field
The invention belongs to flow detection technical field, be specifically related to the flow-type leak locator that a kind of range ability is wide, also relate to the wide flow-type leak locator of this range ability and detect method of flow.
Background technology
Current flow-type leak locator adopts single laminar flow pipe mostly, uses the test pressure of specifying, makes measured workpiece and laminar flow pipe be in same gas circuit, changed, record the flow of measured workpiece by the differential pressure of two pressure tappings of laminar flow pipe.There is following shortcoming in it: sensing range is little, equipment purchasing cost is high, due to the restriction of laminar flow pipe sensitivity, the minimum range that existing flow-type leak locator can detect is 10% of maximum range, when flow is smaller or greater, just need the flow-type leak locator changing another corresponding range, for user, use multiple stage flow-type leak locator, add equipment purchasing cost undoubtedly, cause the wasting of resources; Detection efficiency is low, when running into the workpiece needing to detect multiple flow point, need replacing two even multiple stage flow-type leak locator could realize, cause waste man-hour, production efficiency is affected.
Summary of the invention
The invention provides a kind of wide-range flow-type leak locator, comprise pre-inflation unit, detect gas circuit unit, control module and signals collecting-gas circuit switch unit, described detection gas circuit unit comprises front detection valve, laminar flow pipe and rear detection valve, laminar flow pipe comprises forward and backward two-port, front detection valve is connected by pipeline with laminar flow pipe front port, and rear detection valve is also connected by pipeline with laminar flow pipe rear port; Described detection gas circuit unit has two at least, adjacent two laminar flow pipe range ability existence common factors detecting gas circuit unit and comprise, and the laminar flow pipe that each detection gas circuit unit comprises comprises certain section of range ability only belonging to himself;
Described signals collecting-gas circuit switch unit comprises differential pressure pick-up and two solenoid valves, differential pressure pick-up comprises forward and backward two-port, front port is connected by pipeline with a solenoid valve port, other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe front port respectively, rear port is connected by pipeline with another solenoid valve port, and other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe rear port respectively;
Described control module is electrically connected with front detection valve, rear detection valve, solenoid valve, differential pressure pick-up respectively.
Described pre-inflation unit comprises source of the gas, gas filling valve, vent valve and test pressure sensor, source of the gas is all connected by pipeline with gas filling valve, gas filling valve and vent valve, vent valve is also connected by pipeline with measured object, and test pressure sensor is serially connected in the pipeline of pre-inflation unit;
Source of the gas also respectively with detect valve before each detection gas circuit unit and be connected by pipeline, the rear detection valve of each detection gas circuit unit is also connected by pipeline with measured object respectively simultaneously;
Described control module is connected with gas filling valve, vent valve, test pressure sensor electrical respectively;
Described control module is also electrically connected a display screen.
Described wide-range flow-type leak locator, be also serially connected with temperature sensor in its pipeline, temperature sensor is electrically connected with control module.
Further, institute's use solenoid valve, its port number matches with the quantity detecting gas circuit unit.
Further, described wide-range flow-type leak locator, comprise the first via and detect gas circuit unit and the second tunnel detection gas circuit unit, the first via detects valve after detecting and detecting valve, first via laminar flow pipe and the first via before gas circuit unit comprises the first via, and valve is detected after detecting and detecting valve, the second road laminar flow pipe and the second tunnel before gas circuit unit comprises the second tunnel in the second tunnel;
Described solenoid valve is two-bit triplet solenoid valve.
The present invention also provides the detection method of flow of above-mentioned wide-range flow-type leak locator, as described below:
Presetting a certain detection gas circuit unit is default detection gas circuit unit, solenoid valve default setting is be communicated with the gas circuit between this default detection gas circuit unit laminar flow pipe and differential pressure pick-up, after testing process starts, first control module opens gas filling valve, close vent valve, close the front detection valve of all detection gas circuit unit and rear detection valve simultaneously, start source of the gas to inflate in measured object, test pressure sensor passes force value back control module, after reaching the preset inflation time, control module closes gas filling valve, and open the front detection valve of default detection gas circuit unit, rear detection valve, in source of the gas, gas is successively by the front detection valve of this detection gas circuit unit, laminar flow pipe, rear detection valve flows in measured object,
Differential pressure pick-up gathers this detection gas circuit unit laminar flow pipe front and back end ports force value, obtains differential pressure value and converts it to electric signal, passing control module back, and control module judges it whether within the scope of this detection gas circuit unit inspection; If, enter detection, if do not exist, control module judges which it belongs to and detect gas circuit unit inspection scope, and pass through Controlling solenoid valve, close two the solenoid valve respective channel being communicated with gas circuit between current detection gas circuit unit laminar flow pipe and differential pressure pick-up, open two the solenoid valve respective channel being communicated with gas circuit between corresponding detection gas circuit unit laminar flow pipe and differential pressure pick-up, differential pressure pick-up gathers this corresponding detection gas circuit unit laminar flow pipe front and back end ports force value again, obtain differential pressure value and convert it to electric signal, passing control module back and carry out subsequent treatment;
After reaching default detection time, control module closes all detection gas circuit unit front detection valves and rear detection valve, and solenoid valve is returned to default setting, and opens vent valve, gases at high pressure in measured object are discharged, simultaneously in control module display screen display testing result.
Further, gather the temperature in gas circuit by temperature sensor, and back the control module of passing, the metrical error that modifying factor temperature variation is brought.
Further, described control module adopts schmidt trigger mode, by controlling associated solenoid valve gas channels, switches the adjacent detection gas circuit unit laminar flow pipe that sensing range exists between duplicate block.
The present invention adopts multichannel laminar flow pipe in parallel, and the flow-type realizing wide-range scope detects; Adopt intelligent handoff technique, when current laminar flow pipe does not mate with the range detected, system will access appropriate laminar flow pipe automatically, and other laminar flow pipe gas circuit be disconnected; Adopt Schmidt gas circuit handover trigger, between multichannel laminar flow pipe, be equipped with return difference, avoid when measured object flow is between two-way laminar flow pipe range ability and occur frequent switching.This leak locator sensing range is wide, uses a wide-range flow-type leak locator, can detect the multiple measured object that flow is widely different; Acquisition cost is low, uses a wide-range flow-type leak locator, can be engaged in the work that original multiple stage flow-type leak locator just can complete, greatly reduce acquisition cost; Detection efficiency is high, and user, without the need to carrying out complicated setting and type selecting, does not need to change multiple stage flow-type leak locator yet, only needs measured object to be connected to wide-range flow-type leak locator, can carry out flow detection, improve detection efficiency to measured object.
Accompanying drawing explanation
Fig. 1 is pipeline of the present invention, electric connecting relation schematic diagram
In figure: dotted line is electrical connecting wires, solid line is pipeline line
In figure: 1. detect valve, 9. differential pressure pick-up, 10. two-bit triplet solenoid valve, 11. control modules, 12. vent valves, 13. temperature sensors, 14. test pressure sensors, 15. measured objects after detecting valve, 8. the second tunnel after detecting valve, 5. first via laminar flow pipe, 6. the second road laminar flow pipe, the 7. first via before detecting valve, 4. the second tunnel before source of the gas, 2. gas filling valve, the 3. first via
Embodiment
The invention provides a kind of wide-range flow-type leak locator, comprise pre-inflation unit, detect gas circuit unit, control module 11 and signals collecting-gas circuit switch unit, valve is detected before described detection gas circuit unit comprises, laminar flow pipe and rear detection valve, before laminar flow pipe comprises, rear two-port, front detection valve is connected by pipeline with laminar flow pipe front port, rear detection valve is also connected by pipeline with laminar flow pipe rear port, described detection gas circuit unit has two at least, adjacent two laminar flow pipe range ability existence common factors detecting gas circuit unit and comprise, and the laminar flow pipe that each detection gas circuit unit comprises comprises certain section of range ability only belonging to himself,
Described signals collecting-gas circuit switch unit comprises differential pressure pick-up 9 and two solenoid valves, differential pressure pick-up 9 comprises forward and backward two-port, front port is connected by pipeline with a solenoid valve port, other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe front port respectively, rear port is connected by pipeline with another solenoid valve port, and other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe rear port respectively;
Described control module 11 is electrically connected with front detection valve, rear detection valve, solenoid valve, differential pressure pick-up 9 respectively.
As shown in Figure 1, described pre-inflation unit comprises source of the gas 1, gas filling valve 2, vent valve 12 and test pressure sensor 14, source of the gas 1 is all connected by pipeline with gas filling valve 2, gas filling valve 2 and vent valve 12, vent valve 12 is also connected by pipeline with measured object 15, and test pressure sensor 14 is serially connected in the pipeline of pre-inflation unit;
Source of the gas 1 also respectively with detect valve before each detection gas circuit unit and be connected by pipeline, the rear detection valve of each detection gas circuit unit is also connected by pipeline with measured object 15 respectively simultaneously;
Described control module 11 is electrically connected with gas filling valve 2, vent valve 12, test pressure sensor 14 respectively;
Described control module 11 is also electrically connected a display screen, for being shown by the flow value detected.
Described wide-range flow-type leak locator, be also serially connected with temperature sensor 13 in its pipeline, temperature sensor 13 is electrically connected with control module 11, and it sends pipe temperature to control module 11, through the metrical error that certain algorithm modifying factor temperature variation is brought.
In order to saving resource, institute's use solenoid valve, its port number matches with the quantity detecting gas circuit unit, avoids solenoid valve also having unnecessary port leave unused and causes waste.
In actual production practice, generally comprise two wide-range flow-type leak locators detecting gas circuit unit and can meet detection demand in most cases, as shown in Figure 1, the first via that comprises wide-range flow-type leak locator detects gas circuit unit and the second tunnel detection gas circuit unit, the first via detects valve 7 after detecting and detecting valve 3, first via laminar flow pipe 5 and the first via before gas circuit unit comprises the first via, and valve 8 is detected after detecting and detecting valve 4, second road laminar flow pipe 6 and the second tunnel before gas circuit unit comprises the second tunnel in the second tunnel;
Described solenoid valve is two-bit triplet solenoid valve 10;
Detect valve 3 before the first via to be connected by pipeline with first via laminar flow pipe 5 front port, detect valve 7 after the first via to be also connected by pipeline with first via laminar flow pipe 5 rear port, detect valve 4 before second tunnel to be connected by pipeline with the second road laminar flow pipe 6 front port, detect valve 8 behind the second tunnel and be also connected by pipeline with the second road laminar flow pipe 6 rear port;
Differential pressure pick-up 9 front port is connected by pipeline with two-bit triplet solenoid valve 10 Single port, these all the other two-port of two-bit triplet solenoid valve 10 are connected by pipeline with first via laminar flow pipe 5 front port, the second road laminar flow pipe 6 front port respectively, differential pressure pick-up 9 rear port is connected by pipeline with another two-bit triplet solenoid valve 10 Single port, and these all the other two-port of two-bit triplet solenoid valve 10 are connected by pipeline with first via laminar flow pipe 5 rear port, the second road laminar flow pipe 6 rear port respectively;
Control module 11 respectively with detect valve 3, second tunnel before the first via before detect valve 4, the first via after detect valve 7, second tunnel after detect valve 8, two-bit triplet solenoid valve 10 is electrically connected.
The present invention also provides the detection method of flow of above-mentioned wide-range flow-type leak locator, and described method is as follows:
In advance to plug-in in control module 11, this program comprises preliminary filling gas unit program, differential pressure-flow converse routine, each detection gas circuit unit judges program, change detection gas circuit unit program, detected value display routine and detection end program;
Presetting a certain detection gas circuit unit is default detection gas circuit unit, solenoid valve default setting is be communicated with the gas circuit between this default detection gas circuit unit laminar flow pipe and differential pressure pick-up 9, after testing process starts, first control module 11 opens gas filling valve 2, close vent valve 12, close the front detection valve of all detection gas circuit unit and rear detection valve simultaneously, start source of the gas 1 to inflate in measured object 15, test pressure sensor 14 passes force value back control module 11, after reaching the preset inflation time, control module 11 closes gas filling valve 2, and open the front detection valve of default detection gas circuit unit, rear detection valve, in source of the gas 1, gas is successively by the front detection valve of this detection gas circuit unit, laminar flow pipe, rear detection valve flows in measured object 15,
Differential pressure pick-up 9 is according to this detection gas circuit unit laminar flow pipe front and back end ports force value, obtain differential pressure value and convert it to electric signal, pass control module 11 back, control module 11 obtains corresponding flow value by respective algorithms, and judge it whether within the scope of this detection gas circuit unit inspection, if, enter detection; Do not judge which it belongs to and detect gas circuit unit inspection scope at then control module 11 according to plug-in, and pass through Controlling solenoid valve, close two the solenoid valve respective channel being communicated with gas circuit between current detection gas circuit unit laminar flow pipe and differential pressure pick-up 9, open two the solenoid valve respective channel being communicated with gas circuit between corresponding detection gas circuit unit laminar flow pipe and differential pressure pick-up 9, differential pressure pick-up 9 gathers this corresponding detection gas circuit unit laminar flow pipe front and back end ports force value again, obtain differential pressure value and convert it to electric signal, passing control module 11 back and carry out subsequent treatment;
After reaching default detection time, control module closes all detection gas circuit unit front detection valves and rear detection valve, and solenoid valve is returned to default setting, and opens vent valve 12, gases at high pressure in measured object 15 are discharged, shows screen display testing result at control module 11 simultaneously.
Further, in plug-in in control module 11, temperature drift compensation revision program is also comprised in advance; Detected the temperature in gas circuit by temperature sensor 13, and back the control module 11 of passing, through temperature drift compensation revision program, the metrical error that modifying factor temperature variation is brought.
Occur frequent switching in order to avoid measured object 15 flow value is in when two-way detects between gas circuit unit laminar flow pipe sensing range, change detection gas circuit unit program built-in in described control module 11 adopts schmidt trigger mode to switch the adjacent detection gas circuit unit laminar flow pipe that sensing range exists between duplicate block.
Two adjacent detection gas circuit unit inspection scopes are respectively a ~ b, c ~ d, and d>b>c>a, if the detection gas circuit unit of to be sensing range be a ~ b that current electromagnetic valve is connected, when only having the flow value calculated when control module 11 to be greater than b, control module 11 just connects by Controlling solenoid valve the detection gas circuit unit that sensing range is c ~ d; If the detection gas circuit unit of to be sensing range be c ~ d that current electromagnetic valve is connected, when only having the flow value calculated when control module 11 to be less than c, control module 11 just connects by Controlling solenoid valve the detection gas circuit unit that sensing range is a ~ b.
Above section Example of the present invention has 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 present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (9)
1. a wide-range flow-type leak locator, comprise pre-inflation unit, detect gas circuit unit, control module (11) and signals collecting-gas circuit switch unit, it is characterized in that: described detection gas circuit unit at least comprises two, each detection gas circuit unit comprises the laminar flow pipe that front detection valve, rear detection valve and certain section of range ability only belong to this detection gas circuit unit, laminar flow pipe comprises forward and backward two-port, front detection valve is connected by pipeline with laminar flow pipe front port, and rear detection valve is also connected by pipeline with laminar flow pipe rear port;
Described signals collecting-gas circuit switch unit comprises differential pressure pick-up (9) and two solenoid valves, differential pressure pick-up (9) comprises forward and backward two-port, front port is connected by pipeline with a solenoid valve port, other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe front port respectively, rear port is connected by pipeline with another solenoid valve port, and other ports of this solenoid valve are connected by pipeline with each detection gas circuit unit laminar flow pipe rear port respectively;
Described control module (11) is electrically connected with front detection valve, rear detection valve, solenoid valve, differential pressure pick-up (9) respectively.
2. wide-range flow-type leak locator according to claim 1, is characterized in that: described range ability exists the laminar flow pipe occured simultaneously and is installed on adjacent detection gas circuit unit.
3. wide-range flow-type leak locator according to claim 1 and 2, it is characterized in that: described pre-inflation unit comprises source of the gas (1), gas filling valve (2), vent valve (12) and test pressure sensor (14), source of the gas (1) is all connected by pipeline with gas filling valve (2), gas filling valve (2) and vent valve (12), vent valve (12) is also connected by pipeline with measured object (15), and test pressure sensor (14) is serially connected in the pipeline of pre-inflation unit;
Source of the gas (1) also respectively with detect valve before each detection gas circuit unit and be connected by pipeline, the rear detection valve of each detection gas circuit unit is also connected by pipeline with measured object (15) respectively simultaneously;
Described control module (11) is electrically connected with gas filling valve (2), vent valve (12), test pressure sensor (14) respectively;
Described control module (11) is also electrically connected a display screen.
4. wide-range flow-type leak locator according to claim 1 and 2, it is characterized in that: be also serially connected with temperature sensor (13) in described pipeline, temperature sensor (13) is electrically connected with control module (11).
5. wide-range flow-type leak locator according to claim 1, is characterized in that: institute's use solenoid valve, and its port number matches with the quantity detecting gas circuit unit.
6. wide-range flow-type leak locator according to claim 1 and 2, it is characterized in that: comprise the first via and detect gas circuit unit and the second tunnel detection gas circuit unit, the first via detects valve (7) after detecting and detecting valve (3), first via laminar flow pipe (5) and the first via before gas circuit unit comprises the first via, and valve (8) is detected after detecting and detecting valve (4), the second road laminar flow pipe (6) and the second tunnel before gas circuit unit comprises the second tunnel in the second tunnel;
Described solenoid valve is two-bit triplet solenoid valve (10).
7. a detection method of flow for wide-range flow-type leak locator, is characterized in that: described method is as follows:
Presetting a certain detection gas circuit unit is default detection gas circuit unit, solenoid valve default setting is be communicated with the gas circuit between this default detection gas circuit unit laminar flow pipe and differential pressure pick-up (9), after testing process starts, control module (11) first opens gas filling valve (2), close vent valve (12), close the front detection valve of all detection gas circuit unit and rear detection valve simultaneously, start source of the gas (1) inflation in measured object (15), force value is passed back control module (11) by test pressure sensor (14), after reaching the preset inflation time, control module (11) closes gas filling valve (2), and open the front detection valve of default detection gas circuit unit, rear detection valve, in source of the gas (1), gas is successively by the front detection valve of this detection gas circuit unit, laminar flow pipe, rear detection valve flows in measured object (15),
Differential pressure pick-up (9) gathers this detection gas circuit unit laminar flow pipe front and back end ports force value, obtain differential pressure value and convert it to electric signal, pass control module (11) back, control module (11) judges it whether within the scope of this detection gas circuit unit inspection, if, enter detection, if do not exist, control module (11) judges which it belongs to and detect gas circuit unit inspection scope, and pass through Controlling solenoid valve, close two the solenoid valve respective channel being communicated with gas circuit between current detection gas circuit unit laminar flow pipe and differential pressure pick-up (9), open two the solenoid valve respective channel being communicated with gas circuit between corresponding detection gas circuit unit laminar flow pipe and differential pressure pick-up (9), differential pressure pick-up (9) gathers this corresponding detection gas circuit unit laminar flow pipe front and back end ports force value again, obtain differential pressure value and convert it to electric signal, pass control module (11) back and carry out subsequent treatment,
After reaching default detection time, control module closes all detection gas circuit unit front detection valves and rear detection valve, solenoid valve is returned to default setting, and open vent valve (12), gases at high pressure in measured object (15) are discharged, simultaneously in control module (11) display screen display testing result.
8. the detection method of flow of wide-range flow-type leak locator according to claim 6, it is characterized in that: gather the temperature in gas circuit by temperature sensor (13), and it is passed back control module (11), the metrical error that modifying factor temperature variation is brought.
9. the detection method of flow of wide-range flow-type leak locator according to claim 6, it is characterized in that: described control module (11) adopts schmidt trigger mode, by controlling associated solenoid valve gas channels, the adjacent detection gas circuit unit laminar flow pipe that sensing range exists between duplicate block is switched.
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| CN201410464840.3A CN104215406B (en) | 2014-09-12 | 2014-09-12 | Wide-range flow-type leak detector and its detection method |
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| CN117148877A (en) * | 2023-11-01 | 2023-12-01 | 苏芯物联技术(南京)有限公司 | High-precision pipeline flow measurement control device and design method |
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| Publication number | Publication date |
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| CN104215406B (en) | 2017-04-05 |
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