CN108775992B - Simple multifunctional pneumatic valve leakage detection device and leakage detection method - Google Patents
Simple multifunctional pneumatic valve leakage detection device and leakage detection method Download PDFInfo
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- CN108775992B CN108775992B CN201810750178.6A CN201810750178A CN108775992B CN 108775992 B CN108775992 B CN 108775992B CN 201810750178 A CN201810750178 A CN 201810750178A CN 108775992 B CN108775992 B CN 108775992B
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Indication Of The Valve Opening Or Closing Status (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a simple multifunctional pneumatic valve leakage detection device and a leakage detection method. The leak detection device comprises an air supply unit, a first air passage and a second air passage, wherein the first air passage and the second air passage are connected with the air supply unit; the first air passage is provided with a two-position switch valve, a first filtering pressure-reducing valve and a two-position five-way control valve which are sequentially arranged along the air flow direction, and the second air passage is provided with a second filtering pressure-reducing valve and a rotameter which are sequentially arranged along the air flow direction. The invention can simply and rapidly judge the leakage condition of the pneumatic valve seal and can position the leakage position of the cylinder on the sealing surface of the piston, thereby being convenient for rapidly evaluating the operation safety of the corresponding production device. Namely, the invention ensures the safety and stability of the pneumatic valve.
Description
Technical Field
The invention belongs to the technical field of valve detection, and particularly relates to a simple multifunctional pneumatic valve leakage detection device and a leakage detection method.
Background
Most of industrial instrument regulating valves are pneumatic regulating valves, and in the long-term use process of the valves, the sealing surfaces of the valve bodies are worn due to frequent actions of the valves or medium scouring corrosion and the like, so that the sealing performance of the valve bodies is reduced; meanwhile, the frequent action of the piston or the diaphragm of the actuating mechanism also causes the phenomena of air leakage of the actuating mechanism, fluctuation of the valve or loss of the adjusting function. These phenomena are quite detrimental to production. The reasons for these failures are generally not found quickly, and considerable losses are incurred to the manufacturing enterprise.
Disclosure of Invention
In order to solve the technical problems, the invention provides a simple multifunctional pneumatic valve leakage detection device and a leakage detection method.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a simple multifunctional pneumatic valve leak detection device comprises an air supply unit, and a first air channel and a second air channel which are connected with the air supply unit; the first air passage is provided with a two-position switch valve, a first filtering pressure-reducing valve and a two-position five-way control valve which are sequentially arranged along the air flow direction, and the second air passage is provided with a second filtering pressure-reducing valve and a rotameter which are sequentially arranged along the air flow direction.
The technical scheme is as follows: and a control air passage which is communicated with the first air passage and used for controlling the two-position five-way control valve to switch the air passage is arranged between the two-position switch valve and the first filtering pressure reducing valve, and a reversing three-way valve used for switching whether the control air passage is ventilated or not is arranged on the control air passage.
The technical scheme is as follows: when the sealing surface of the valve body leaks, a first air outlet hole of the two-position five-way control valve is communicated with an air inlet of an air cylinder in the pneumatic valve, a second air outlet hole of the two-position five-way control valve is communicated with an air outlet of the air cylinder in the pneumatic valve, and an outlet end of the second air passage is communicated with an inlet of the valve body of the pneumatic valve; when the sealing surface of the air cylinder leaks, the outlet end of the second air path is communicated with the air inlet of the air cylinder in the pneumatic valve.
A leak detection method based on the simple multifunctional pneumatic valve leak detection device comprises leak detection of a valve body sealing surface and leak detection of a cylinder sealing surface;
the leakage detection step of the sealing surface of the valve body is as follows:
step 1, a first air outlet hole of the two-position five-way control valve is communicated with an air inlet of an air cylinder in the pneumatic valve, a second air outlet hole of the two-position five-way control valve is communicated with an air outlet of the air cylinder in the pneumatic valve, and an outlet end of the second air path is communicated with an inlet of a valve body of the pneumatic valve;
step 2, opening a two-position switch valve, adjusting the pressure display value of the first filtering pressure reducing valve to the rated pressure of the cylinder drive so as to realize the movement of a piston in the cylinder and enable the valve to be in a completely closed state, and simultaneously adjusting the opening of the second filtering pressure reducing valve and the opening of the rotameter to be maximum;
step 3, observing the rotameter after the pressure in the second gas circuit is stable, if the display value of the rotameter is zero, indicating that the sealing surface of the valve body is not leaked, otherwise, indicating that the sealing surface of the valve body is leaked;
the leakage detection step of the sealing surface of the cylinder is as follows:
step 1, communicating the outlet end of the second air path with an air inlet of an air cylinder in a pneumatic valve;
step 2, adjusting the opening of the rotameter to the maximum, slowly adjusting the pressure display value of the second filtering and reducing valve to realize the movement of the piston in the cylinder and enable the valve to be at a set opening, then stopping adjusting the second filtering and reducing valve and observing the rotameter, if the display value of the rotameter is zero, indicating that the cylinder and the piston sealing surface are not leaked, otherwise, indicating that the cylinder and the piston sealing surface are leaked;
and 3, repeating the steps 1 and 2, so that the valve is positioned at a plurality of openings, and determining the leakage condition of the sealing surface of the cylinder under each opening.
The technical scheme is as follows: the leakage detection step of the sealing surface of the valve body is repeated for a plurality of times, and before each repetition of the leakage detection step of the sealing surface of the valve body, the reversing three-way valve on the air path is controlled by switching the two-position five-way control valve so as to realize the reciprocating motion of the piston in the cylinder.
The invention has the beneficial effects that:
the invention can simply and rapidly judge the leakage condition of the pneumatic valve seal and can position the leakage position of the sealing surface of the cylinder and the piston, thereby being convenient for rapidly evaluating the operation safety of the corresponding production device. Namely, the invention ensures the safety and stability of the pneumatic valve.
Drawings
FIG. 1 is a schematic view of a leak detection mounting structure for a sealing surface of a valve body.
FIG. 2 is a schematic diagram of a leak detection mounting structure for a cylinder sealing surface.
The meaning of the symbols in the drawings is as follows:
1-two-position switch valve; 2-a first filter pressure reducing valve; 3-reversing three-way valve; 3 a-a first gas source tube; 3 b-a second air source tube; 3 c-a third air source pipe; 4-two-position five-way pneumatic control valve; 4 a-a first vent; 4 b-a first air outlet; 4 c-a second vent; 4 d-a second air outlet hole; 4 e-an air inlet hole; 5-cylinder; 5 a-a piston; 5 b-a spring; 6-a second filtering pressure reducing valve; 7-rotameter; 8-a valve body; 9-valve core; 10-valve seat; 11-flange plates; 12-an air supply unit.
Detailed Description
The technical scheme of the invention is more specifically described below by combining examples:
the invention relates to a simple multifunctional pneumatic valve leak detection device, which comprises an air supply unit 12, a first air channel and a second air channel, wherein the first air channel and the second air channel are connected with the air supply unit 12; the first air passage is provided with a two-position switch valve 1, a first filtering pressure-reducing valve 2 and a two-position five-way control valve 4 which are sequentially arranged along the air flow direction, and the second air passage is provided with a second filtering pressure-reducing valve 6 and a micro-rotameter 7 which are sequentially arranged along the air flow direction.
A control air passage which is communicated with the first air passage and used for controlling the two-position five-way control valve 4 to switch the air passage is arranged between the two-position switch valve 1 and the first filtering pressure reducing valve 2, and a reversing three-way valve 3 is arranged on the control air passage.
The gas circuit switching principle in the two-position five-way pneumatic control valve shown in fig. 1 is as follows: when air passes through the second air source pipe 3b on the control air path, the air inlet hole 4e is communicated with the first air outlet hole 4b, and the second air outlet hole 4c is communicated with the second air outlet hole 4 d; when no air passes through the second air source pipe 3b on the control air path, the air inlet hole 4e is communicated with the second air outlet hole 4d, and the first air outlet hole 4a is communicated with the first air outlet hole 4 d.
The leak detection method based on the simple multifunctional pneumatic valve leak detection device comprises leak detection of a valve body sealing surface and leak detection of a cylinder sealing surface;
the step of leak detection of the sealing surface of the valve body is as follows, and is described with reference to fig. 1:
step 1, a first air outlet hole 4b of the two-position five-way control valve 4 is communicated with an air inlet of an air cylinder 5 in a pneumatic valve, a second air outlet hole 4d of the two-position five-way control valve 4 is communicated with an air outlet of the air cylinder 5 in the pneumatic valve, an outlet end of a second air passage is communicated with an inlet of a valve body 8 of the pneumatic valve, in the embodiment, the inlet of the valve body 8 is sealed through a flange plate 11, and the outlet end of the second air passage is connected with an inlet on the flange plate 11 to realize the communication with the inlet of the valve body 8;
step 2, opening the two-position switch valve 1, adjusting the pressure display value of the first filtering pressure reducing valve 2 to the cylinder driving rated pressure to realize the movement of a piston 5a in the cylinder 5 and make the valve in a completely closed state, and simultaneously adjusting the opening of the second filtering pressure reducing valve 6 and the opening of the rotameter 7 to the maximum;
step 3, observing the rotameter 7 after the pressure in the second gas path is stable, if the display value of the rotameter 7 is zero, indicating that the sealing surface of the valve body is not leaked, otherwise, indicating that the sealing surface of the valve body is leaked;
in order to ensure the accuracy of the leakage detection of the valve body sealing surface, the leakage detection step of the valve body sealing surface is repeated for a plurality of times, and before each repetition of the leakage detection step of the valve body sealing surface, the reversing three-way valve 3 on the air path is controlled by switching the two-position five-way control valve 4 so as to realize the reciprocating motion of the piston 5a in the air cylinder 5, so that the piston 5a drives the valve core 9 to reciprocate, and when the valve core 9 moves, air flow for blowing the sealing surface of the valve seat 10 is generated, and the sealing surface of the valve seat 10 is ensured to be free of impurities, so that the tight contact between the valve core 9 and the sealing surface of the valve seat 10 is realized.
The cylinder sealing surface leak detection step is as follows, and is described with reference to fig. 2:
step 1, communicating the outlet end of the second air path with an air inlet of an air cylinder 5 in the pneumatic valve;
step 2, adjusting the opening of the rotameter 7 to the maximum, slowly adjusting the pressure display value of the second filtering and reducing valve 6 (the pressure value is smaller than or equal to the rated cylinder driving pressure) to enable the piston 5a in the cylinder 5 to move and enable the valve to be at the set opening, then stopping adjusting the second filtering and reducing valve 6 and observing the rotameter 7, if the display value of the rotameter 7 is zero, indicating that the sealing surfaces of the cylinder 5 and the piston 5a are not leaked, otherwise, indicating that the sealing surfaces of the cylinder 5 and the piston 5a are leaked;
and 3, repeating the steps 1 and 2, so that the valve is positioned at a plurality of openings, and determining the leakage condition of the sealing surface of the cylinder under each opening. The invention can check leakage of the sealing surface of the cylinder in the range of the piston stroke.
Claims (2)
1. A leak detection method of a simple multifunctional pneumatic valve leak detection device is characterized in that: the simple multifunctional pneumatic valve leak detection device comprises an air supply unit (12), and a first air passage and a second air passage which are connected with the air supply unit (12); the first air passage is provided with a two-position switch valve (1), a first filtering pressure-reducing valve (2) and a two-position five-way control valve (4) which are sequentially arranged along the air flow direction, and the second air passage is provided with a second filtering pressure-reducing valve (6) and a rotameter (7) which are sequentially arranged along the air flow direction;
when the sealing surface of the valve body leaks, a first air outlet hole (4 b) of the two-position five-way control valve (4) is communicated with an air inlet of an air cylinder (5) in the pneumatic valve, a second air outlet hole (4 d) of the two-position five-way control valve (4) is communicated with an air outlet of the air cylinder (5) in the pneumatic valve, and an outlet end of the second air channel is communicated with an inlet of a valve body (8) of the pneumatic valve; when the sealing surface of the air cylinder leaks, the outlet end of the second air path is communicated with the air inlet of the air cylinder (5) in the pneumatic valve;
a control gas circuit which is communicated with the first gas circuit and used for controlling the two-position five-way control valve (4) to switch the gas circuit is arranged between the two-position switch valve (1) and the first filtering pressure reducing valve (2), and a reversing three-way valve (3) used for switching whether the control gas circuit is ventilated or not is arranged on the control gas circuit;
the leakage detection method comprises the steps of detecting leakage of a valve body sealing surface and detecting leakage of a cylinder sealing surface;
the leakage detection step of the sealing surface of the valve body is as follows:
step 1, a first air outlet hole (4 b) of the two-position five-way control valve (4) is communicated with an air inlet of an air cylinder (5) in the pneumatic valve, a second air outlet hole (4 d) of the two-position five-way control valve (4) is communicated with an air outlet of the air cylinder (5) in the pneumatic valve, and an outlet end of the second air channel is communicated with an inlet of a valve body (8) of the pneumatic valve;
step 2, opening a two-position switch valve (1), adjusting the pressure display value of the first filtering pressure reducing valve (2) to the rated pressure of the cylinder drive to realize the movement of a piston (5 a) in the cylinder (5) and the complete closing state of the valve, and simultaneously adjusting the opening of the second filtering pressure reducing valve (6) and the opening of a rotameter (7) to the maximum;
step 3, observing the rotameter (7) after the pressure in the second gas path is stable, if the display value of the rotameter (7) is zero, indicating that the sealing surface of the valve body is free from leakage, otherwise, indicating that the sealing surface of the valve body is leaked;
the leakage detection step of the sealing surface of the cylinder is as follows:
step 1, communicating the outlet end of the second air path with an air inlet of an air cylinder (5) in the pneumatic valve;
step 2, adjusting the opening degree of the rotameter (7) to the maximum, slowly adjusting the pressure display value of the second filtering and reducing valve (6) to enable the piston (5 a) in the cylinder (5) to move and enable the valve to be at a set opening degree, then stopping adjusting the second filtering and reducing valve (6) and observing the rotameter (7), and if the display value of the rotameter (7) is zero, indicating that the sealing surfaces of the cylinder (5) and the piston (5 a) are not leaked, otherwise, indicating that the sealing surfaces of the cylinder (5) and the piston (5 a) are leaked;
and 3, repeating the steps 1 and 2, so that the valve is positioned at a plurality of openings, and determining the leakage condition of the sealing surface of the cylinder under each opening.
2. The leak detection method of the simple multifunctional pneumatic valve leak detection device as defined in claim 1, wherein: the leakage detection step of the valve body sealing surface is repeated for a plurality of times, and before each repetition of the leakage detection step of the valve body sealing surface, the reversing three-way valve (3) on the air path is controlled by switching the two-position five-way control valve (4) so as to realize the reciprocating motion of the piston (5 a) in the air cylinder (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750178.6A CN108775992B (en) | 2018-07-10 | 2018-07-10 | Simple multifunctional pneumatic valve leakage detection device and leakage detection method |
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| CN201810750178.6A CN108775992B (en) | 2018-07-10 | 2018-07-10 | Simple multifunctional pneumatic valve leakage detection device and leakage detection method |
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| CN108775992B true CN108775992B (en) | 2024-03-15 |
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Families Citing this family (3)
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| CN111811754B (en) * | 2020-06-28 | 2022-11-22 | 福建福清核电有限公司 | Air chamber tightness testing process for pneumatic piston type regulating valve |
| CN112268654B (en) * | 2020-10-19 | 2022-07-29 | 浙江工业大学 | Method for testing and calibrating stress of pneumatic valve |
| CN113252253B (en) * | 2021-06-24 | 2024-02-09 | 福建慧芯激光科技有限公司 | Pneumatic valve leak hunting device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139400A (en) * | 2000-10-31 | 2002-05-17 | Ricoh Elemex Corp | Air leakage detector and air leakage detecting method for air cylinder |
| CN102927351A (en) * | 2012-11-13 | 2013-02-13 | 济南大学 | Stepless regulation pneumatic control system for opening degree of water-sealing valve |
| CN104565504A (en) * | 2015-01-14 | 2015-04-29 | 江苏海事职业技术学院 | Pneumatic valve control mechanism |
| CN105372025A (en) * | 2015-11-27 | 2016-03-02 | 深圳市招科智控科技有限公司 | Gas tight test board of hydraulic valve |
| CN205918563U (en) * | 2016-07-28 | 2017-02-01 | 苏州寿力气体设备有限公司 | Intake valve |
| CN207366142U (en) * | 2017-09-05 | 2018-05-15 | 奉化市亚方索工业自动化有限公司 | A kind of cylinder air tightness detection equipment |
| CN208568203U (en) * | 2018-07-10 | 2019-03-01 | 安徽六国化工股份有限公司 | A kind of simple multifunctional operated pneumatic valve leak detection device |
-
2018
- 2018-07-10 CN CN201810750178.6A patent/CN108775992B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002139400A (en) * | 2000-10-31 | 2002-05-17 | Ricoh Elemex Corp | Air leakage detector and air leakage detecting method for air cylinder |
| CN102927351A (en) * | 2012-11-13 | 2013-02-13 | 济南大学 | Stepless regulation pneumatic control system for opening degree of water-sealing valve |
| CN104565504A (en) * | 2015-01-14 | 2015-04-29 | 江苏海事职业技术学院 | Pneumatic valve control mechanism |
| CN105372025A (en) * | 2015-11-27 | 2016-03-02 | 深圳市招科智控科技有限公司 | Gas tight test board of hydraulic valve |
| CN205918563U (en) * | 2016-07-28 | 2017-02-01 | 苏州寿力气体设备有限公司 | Intake valve |
| CN207366142U (en) * | 2017-09-05 | 2018-05-15 | 奉化市亚方索工业自动化有限公司 | A kind of cylinder air tightness detection equipment |
| CN208568203U (en) * | 2018-07-10 | 2019-03-01 | 安徽六国化工股份有限公司 | A kind of simple multifunctional operated pneumatic valve leak detection device |
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