CN203672579U - Apparatus for detecting sealing deflect of pressure gauge - Google Patents

Apparatus for detecting sealing deflect of pressure gauge Download PDF

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Publication number
CN203672579U
CN203672579U CN201420048593.4U CN201420048593U CN203672579U CN 203672579 U CN203672579 U CN 203672579U CN 201420048593 U CN201420048593 U CN 201420048593U CN 203672579 U CN203672579 U CN 203672579U
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CN
China
Prior art keywords
gas pipeline
casing
pressure
valve
switch board
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420048593.4U
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Chinese (zh)
Inventor
束高祥
高孝友
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MAANSHAN NAITE INSTRUMENT TECHNOLOGY Co Ltd
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MAANSHAN NAITE INSTRUMENT TECHNOLOGY Co Ltd
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Priority to CN201420048593.4U priority Critical patent/CN203672579U/en
Application granted granted Critical
Publication of CN203672579U publication Critical patent/CN203672579U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model, which belongs to the instrument detection device field, discloses an apparatus for detecting a sealing deflect of a pressure gauge. The apparatus comprises a box body, a pedestal, a control cabinet, a first gas pipeline, a second gas pipeline. The box body is arranged at the pedestal. One end of the second gas pipeline is connected with the box body and the other end is communicated with the air; a second valve is arranged at the second gas pipeline; one end of the first gas pipeline is connected with the second gas pipeline and the other end is connected with the control cabinet; and a first valve is arranged at the first gas pipeline. A standard pressure gauge is arranged at the control cabinet. A sealing door is arranged at one side of the box body; and a handle is arranged at the sealing door. According to the scheme, the pressure boost conception of the existing measurement technology is broken and the provided scheme is in the opposite direction of the existing measurement concept. The depressurization means is used and thus the defect portion explodes, thereby achieving an objective of detecting whether a defect exists or not; and the accuracy is high.

Description

A kind of device of detected pressures table seal defect
Technical field
The utility model belongs to instrument pick-up unit field, more particularly, relates to a kind of device of detected pressures table seal defect.
Background technology
Tensimeter is widely used in the departments such as machinery, oil, chemical industry, metallurgy, mine, electric power, especially in industrial process control and commercial measurement process, because the elastic sensing element of mechanical compression table has very high physical strength and the characteristic such as convenient for production, make mechanical compression table obtain applying more and more widely.Present tensimeter all requires good sealing, so pressure gauge housing is all airproof structure, can effectively protect internal works to avoid environmental impact and filthy intrusion, higher to the requirement detecting like this.Have relatively high expectations because bubble-tight, so every tensimeter all will detect through strict impermeability.For shatter-proof table, whether general detection is all to detect weld by the mode that increases pressure to leak gas, whether drain pan seals with cover circle, plug cock and drain pan, common detection method is that tensimeter is inflated and then put into water, check and whether have bubble to emerge, but still there is limitation in this method.Not only detection efficiency is low for this one by one method that inflation checks, and Detection accuracy is not high, easily causes undetected.Especially for the shatter-proof table of pressure range below 0.3MPa and with the shatter-proof table of explosionproof hole, go inspection by said that method above, have a lot of tiny defects is qualified in the time of inspection, but through long-term use, discovery sealing is defective, and this has not only damaged the prestige of a tensimeter production company, and main is the use cost that has increased user, change complexity, and delayed client's production.
Also someone starts the equipment of air tight test to improve, for example, Chinese Patent Application No.: 201220024418.2, open day: on November 21st, 2012, this utility model provides a kind of portable gas tensimeter pick-up unit, and it comprises high-pressure air source, pressure controller, modular pressure, pressure testers, system pressure table, detected tensimeter; The gas of high-pressure air source is connected to the entrance pressure valve at pressure controller entrance pressure mouth place by pipeline liquid injecting device; Pressure controller has three output interfaces, respectively by pipeline liquid injecting device and modular pressure, pressure testers, system pressure table, and detected tensimeter is connected, each joint adopts the design of taper bulb, provide original pressure by high-pressure air source, and adjust gaging pressure point by variable valve and reach the tested manometric object of verification.This apparatus structure compactness, is easy to carry, and simple to operate, accuracy is high, can realize on-the-spot non-disassembly or the laboratory of (35MPa) manometer under gas medium state and detect.But this detection method not only detection efficiency is low, detection of complex, but also easily cause undetected.
For another example, Chinese Patent Application No.: 201020660204.5, open day: on October 05th, 2011, this utility model discloses a kind of explosive pressure gauge pick-up unit, comprise computer, secondary booster pump, high accuracy number tensimeter, data acquisition software etc., the two ends of described supercharge pump are connected with two stop valves by pressure duct respectively, front end is that a low-pressure shutoff valve is connected in series solenoid valve again, tensimeter, reduction valve and filtrator, described filtrator connects compressed air inlet, described solenoid valve is also by computer described in connection, another high-pressure stop valve is connected in series sensor and digital display meter by the first branch road, described digital display meter is connected with described computer again, be connected in series air release and tested explosive pressure gauge by the second branch road.An air release pressure-release valve in parallel and an impact damper in above-mentioned Article 2 branch road.The driving gas source of this utility model adopts pressurized air, realizes the measurement of high pressure by supercharge pump secondary booster; Have automatic pressure-maintaining function, keep circuit pressure constant, energy consumption is high, and installment work complexity before detecting, and efficiency is low, easily causes undetectedly, due to the effect of gases at high pressure, easily ejects small part in testing process, and people's safety is threatened.
Traditional detection method is the position inflation from lubrication hole, inflation pressure the highest can only be added to 0.015MPa(because pressure cross conference to check and correction after Bourdon tube and hairspring cause become the amount of moving, cause whole table not use), be difficult to detect for little defects such as trickle welding cracks but pressure is too small.Increase thus stressed detection method and cannot meet the requirement of prior art for pin-point accuracy.
Summary of the invention
The problem that 1, will solve
Low to tensimeter detection efficiency for prior art, detect inaccurate, people is easily caused to the problem of security threat, the utility model provides a kind of device of detected pressures table seal defect, it adopts the means of step-down while use, make fault location explosion, reaching detected pressures table has flawless object, and accuracy rate is high, and most crucial advantage is the change amount of moving that can not cause Bourdon tube and hairspring.
2, technical scheme
For addressing the above problem, the utility model adopts following technical scheme.
A device for detected pressures table seal defect, comprises casing, base, switch board, the first gas pipeline and the second gas pipeline, and described casing is positioned on base; One end of the second described gas pipeline is connected with casing, and the other end communicates with air, is provided with the second valve on the second gas pipeline; One end of the first described gas pipeline is connected with the second gas pipeline, and the other end is connected with switch board; The first described gas pipeline is provided with the first valve; Described switch board is provided with master gauge; One side of described casing is provided with hermatic door, is also provided with handle on described hermatic door.
Preferably, the bottom of described casing is also provided with the 3rd valve.
Preferably, the inside of described casing is divided into 2-500 little space by dividing plate; The material of described dividing plate is No. 45 steel, and thickness is 0.8cm.
Preferably, the quantity of described handle has 6, respectively has three in the both sides of hermatic door.
Preferably, be provided with vacuum pump and control system in described switch board, vacuum pump is connected with one end of the first gas pipeline, and the operation of vacuum pump is by control system control.
The using method of the device of this detected pressures table seal defect is:
(1) rotary handle, opens hermatic door, and tensimeter to be detected is placed in casing;
(2) close hermatic door, with handle sealing, make to form in casing the environment of a sealing;
(3) close the second valve, open the first valve, start the vacuum pump in switch board, vacuum pump is bled from casing, reduces the pressure in casing, by the become-0.1MPa of pressure differential of the pressure in casing and casing external environment, keeps 10-40min;
(4) close the first valve and vacuum pump, open the second valve, the pressure in casing progressively increases, and makes pressure in casing equal the pressure of casing external environment;
(5) rotary handle, opens hermatic door, takes out tensimeter, checks that whether tensimeter is normal, if occurred, explosion-proof plug cock is rushed out or tensimeter abnormality in outer shape, is judged as defectively, if all are normal for manometric explosion-proof plug cock and profile, it is qualified to regard as.
The pressure that reduces casing when detection is progressively to reduce, can directly adopt the mode of vacuum suction, also can accurately control, the time of establishing is t, and unit is min, the pressure differential of the pressure in casing and casing external environment is p, unit is MPa, p=-0.1*(t/60) 2, until when become-0.1MPa of pressure differential p, pressure differential p is constant, keeps 10-40min; Can also be first p is reduced to-0.08MPa time, stop bleeding, open the second valve, allow return to-0.06MPa of p, then close the second valve, continue to bleed, if the time is T, initial time T is now 0, p=-0.1*[(T+46)/60] 2, in the time of become-0.1MPa of pressure differential p, keep 10-40min.
As the case may be, sometimes because the variation meeting of air pressure produces water in casing, now need to after tensimeter has detected, open the 3rd valve, draining, sometimes can not need draining, according to whether there being water to determine in casing.
3, beneficial effect
Than prior art, the beneficial effects of the utility model are:
(1) the utility model comprises casing, base, switch board, the first gas pipeline and the second gas pipeline, and casing is positioned on base; One end of the second gas pipeline is connected with casing, and the other end communicates with air, is provided with the second valve on the second gas pipeline; One end of the first gas pipeline is connected with the second gas pipeline, and the other end is connected with switch board; The first gas pipeline is provided with the first valve; Switch board is provided with master gauge, and the external and internal pressure of directly directly reading casing is poor; One side of casing is provided with hermatic door, on hermatic door, be also provided with handle, when use, directly by casing is bled, reduce the pressure in casing, by the become-0.1MPa of pressure differential of the pressure in casing and casing external environment, break the supercharging theory of existing measuring technique, run in the opposite direction with existing measurement theory, adopt the means of step-down, make fault location explosion, reaching detected pressures table has flawless object, and accuracy rate is high; Most crucial advantage is the change amount of moving that can not cause Bourdon tube and hairspring; Simplicity of design, and control conveniently;
(2) inside of the utility model casing is divided into 2-500 little space by dividing plate, and a tensimeter is placed in each like this space, and detection efficiency is high, and underproof product can not cause damage to certified products, the material of dividing plate is No. 45 steel, thickness is 0.8cm, this material is that the special software designing by the utility model people carries out considering setting after dynamic similation and Infrared survey, both met certified products and do not impacted by unacceptable product the requirement that causes damage, also saved to greatest extent material cost simultaneously, because thick steel plate is safe as you know, but cost is high, due to the dangerous property of this calibration tape, so for the sake of security, even if others skilled in the art person does device of the present utility model, also be only to expect adopting thick steel plate, hesitate to measure sheet steel, so also cannot determine and meet safe minimum standard, because can not do a large amount of experiments,
(3) the utility model can reach without undetected effect, and simple in structure, easy to operate, cost is low.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In figure: 1, casing; 2, handle; 3, hermatic door; 4, base; 5, the 3rd valve; 6, switch board; 7, the first gas pipeline; 8, the first valve; 9, the second valve; 10, the second gas pipeline.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
Embodiment 1
A device for detected pressures table seal defect, comprises casing 1, base 4, switch board 6, the first gas pipeline 7 and the second gas pipeline 10, and casing 1 is positioned on base 4; The inside of casing 1 is divided into 2-500 little space by dividing plate, the present embodiment adopts 200 boothes, other situation simultaneously, those skilled in the art readily appreciate that how to arrange and can predict effect according to 200 compartments, belong to the scheme that those skilled in the art can realize, do not repeat them here; The material of dividing plate is No. 45 steel, and thickness is 0.8cm.The bottom of casing 1 is also provided with the 3rd valve 5.One end of the second gas pipeline 10 is connected with casing 1, and the other end communicates with air, is provided with the second valve 9 on the second gas pipeline 10; One end of the first gas pipeline 7 is connected with the second gas pipeline 10, and the other end is connected with switch board 6; The first gas pipeline 7 is provided with the first valve 8; Switch board 6 is provided with master gauge; In switch board 6, be provided with vacuum pump and control system, vacuum pump is connected with one end of the first gas pipeline 7, and the operation of vacuum pump is by control system control.One side of casing 1 is provided with hermatic door 3, is also provided with handle 2 on hermatic door 3.The quantity of handle 2 has 6, respectively has three in the both sides of hermatic door 3.
The using method of the device of this detected pressures table seal defect is:
(1) rotary handle 2, opens hermatic door 3, and tensimeter to be detected is placed in casing 1;
(2) close hermatic door 3, seal with handle 2, make the environment of a sealing of the interior formation of casing 1;
(3) close the second valve 9, open the first valve 8, start the vacuum pump in switch board 6, vacuum pump is bled from casing 1, reduces the pressure in casing 1, by the become-0.1MPa of pressure differential of the pressure in casing 1 and casing 1 external environment; The pressure that reduces casing 1 when detection is progressively to reduce, the mode that can directly adopt vacuum originally to bleed, also can accurately control, if the time is t, unit is min, and the pressure differential of the pressure in casing 1 and casing 1 external environment is p, unit is MPa, p=-0.1*t/602, until when become-0.1MPa of pressure differential p, pressure differential p is constant; Can also be first p is reduced to-0.08MPa time, stop bleeding, keep 40min, open the second valve 9, allow return to-0.06MPa of p, then close the second valve (9), continue to bleed, if the time is T, initial time is now that T is 0, p=-0.1*[(T+46)/60] 2, in the time of become-0.1MPa of pressure differential p, keep 10-40min.
(4) close the first valve 8 and vacuum pump, open the second valve 9, the pressure in casing 1 progressively increases, and makes pressure in casing 1 equal the pressure of casing 1 external environment;
(5) rotary handle 2, opens hermatic door 3, takes out tensimeter, check that whether tensimeter is normal, if occurred, explosion-proof plug cock is rushed out or tensimeter abnormality in outer shape, is judged as defective, if all are normal for manometric explosion-proof plug cock and profile, it is qualified to regard as.
Through verification experimental verification, the mode that step (3) directly adopts vacuum originally to bleed, tested 5 batches of tensimeters, 200 every batch, detection efficiency is high, measure altogether 1000 tensimeters, total detect 15 defective, in the reason of discovery, have 11 be that explosion-proof plug cock is rushed out, between 1 cover circle and drain pan, split, 2 joints and Bourdon tube weld split, and 1 is to occur crack between switch plug cock and drain pan; In remaining 985 specification product through the use of 2 months, only have two defective, judgement may be that defect is too small afterwards, through step, when (3), this defect is not split, and causes undetected; Bourdon tube and hairspring do not become the amount of moving.
Step (3) adopts situation about accurately controlling, and the time of establishing is t, and unit is min, and the pressure differential of the pressure in casing 1 and casing 1 external environment is p, and unit is MPa, and p=-0.1*t/602, until when become-0.1MPa of pressure differential p, pressure differential p is constant, maintenance 20min; Detect 8 batches of tensimeters, amount to 1600 tensimeters, find that there is 21 defective, wherein there are 16 explosion-proof plug cocks to be rushed out, 2 covers enclose between drain pan and split, and 3 is to occur crack between switch plug cock and drain pan, and this crack only has 1mm, if measure through embodiment 1, estimate that crackle is herein less before test, if not the step-down process through the present embodiment, this crackle can not expand 1mm to, although just 1mm, is enough to allow technician detect this product defective; Bourdon tube and hairspring do not become the amount of moving.In remaining 1589 specification product through the use of 3 months, only have 1 defective, defective reason is that the weld seam between switch plug cock and drain pan has welding crack, tentatively judge that this tensimeter weld seam before detection has internal fissure, in the inside of weld seam, be difficult for washing open, when detection, do not split, cause undetected.
Adopt the most complicated control method for step (3), when first p is reduced to-0.08MPa, stop bleeding, open the second valve 9, allow return to-0.06MPa of p, then close the second valve 9, continue to bleed, if the time is T, initial time T is now 0, p=-0.1*[(T+46)/60] 2, in the time of become-0.1MPa of pressure differential p, keep 10min.Detect 10 batches of tensimeters, amount to 2000 tensimeters, find that there is 37 defective, wherein there are 28 explosion-proof plug cocks to be rushed out, 5 covers enclose between drain pan and split, 1 joint and Bourdon tube weld split, and 3 is to occur crack between switch plug cock and drain pan, and has 2 cracks to only have respectively 0.8mm and 1mm; In remaining 1972 specification product through the use of 5 months, do not find defective, the present embodiment adopts | and p| first becomes large, diminish again, then the method increasing, and the Changing Pattern of control p, give full play to mechanics feature and utilize crack propagation law, the crackle of butt welded seam adopts a buffering, and the internal fissure of weld seam also can be split smoothly, has reached without undetected detection effect.Although increased difficulty with respect to embodiment 1 and embodiment 2 in control, precision is higher.The concrete situation that adopts which embodiment decides the requirement of precision according to actual need of production and client, and present specification is not repeating.

Claims (5)

1. a device for detected pressures table seal defect, is characterized in that: comprise casing (1), base (4), switch board (6), the first gas pipeline (7) and the second gas pipeline (10), described casing (1) is positioned on base (4); One end of described the second gas pipeline (10) is connected with casing (1), and the other end communicates with air, is provided with the second valve (9) on the second gas pipeline (10); One end of described the first gas pipeline (7) is connected with the second gas pipeline (10), and the other end is connected with switch board (6); Described the first gas pipeline (7) is provided with the first valve (8); Described switch board (6) is provided with master gauge; One side of described casing (1) is provided with hermatic door (3), on described hermatic door (3), is also provided with handle (2).
2. the device of a kind of detected pressures table seal defect according to claim 1, is characterized in that: the bottom of described casing (1) is also provided with the 3rd valve (5).
3. the device of a kind of detected pressures table seal defect according to claim 1, is characterized in that: the inside of described casing (1) is divided into 2-500 little space by dividing plate; The material of described dividing plate is No. 45 steel, and thickness is 0.8cm.
4. the device of a kind of detected pressures table seal defect according to claim 1, is characterized in that: the quantity of described handle (2) has 6, respectively has three in the both sides of hermatic door (3).
5. according to the device of a kind of detected pressures table seal defect described in any one in claim 1-4, it is characterized in that: in described switch board (6), be provided with vacuum pump and control system, vacuum pump is connected with the one end of the first gas pipeline (7).
CN201420048593.4U 2014-01-24 2014-01-24 Apparatus for detecting sealing deflect of pressure gauge Expired - Fee Related CN203672579U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106197792A (en) * 2015-05-26 2016-12-07 Wika亚历山大·威甘德欧洲股份两合公司 There is the leaf spring type piezometer of control function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106197792A (en) * 2015-05-26 2016-12-07 Wika亚历山大·威甘德欧洲股份两合公司 There is the leaf spring type piezometer of control function
CN106197792B (en) * 2015-05-26 2021-01-01 威卡亚力山大维甘德欧洲两合公司 Plate spring type pressure gauge with monitoring function

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140625

Termination date: 20170124

CF01 Termination of patent right due to non-payment of annual fee