CN204479250U - A kind of gas meter, flow meter gas transmission state seal performance pick-up unit - Google Patents

A kind of gas meter, flow meter gas transmission state seal performance pick-up unit Download PDF

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Publication number
CN204479250U
CN204479250U CN201420687220.1U CN201420687220U CN204479250U CN 204479250 U CN204479250 U CN 204479250U CN 201420687220 U CN201420687220 U CN 201420687220U CN 204479250 U CN204479250 U CN 204479250U
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CN
China
Prior art keywords
gas
meter
flow meter
gland bonnet
gas meter
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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
CN201420687220.1U
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Chinese (zh)
Inventor
李辉
董克建
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Tianjin University of Technology
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Tianjin University of Technology
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Priority to CN201420687220.1U priority Critical patent/CN204479250U/en
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Publication of CN204479250U publication Critical patent/CN204479250U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model proposes a kind of gas meter, flow meter gas transmission state seal performance pick-up unit, comprise cylinder, gland bonnet, sealable tank, little differential pressure sensor and source of the gas transfer conduit, described gland bonnet is provided with the gas circuit transmission interface corresponding with the air inlet/outlet upper-lower position of gas meter, flow meter in sealable tank and Leak Detection mouth, is provided with support, spring and jig in described sealable tank.

Description

A kind of gas meter, flow meter gas transmission state seal performance pick-up unit
Technical field
The present invention relates to a kind of gas meter leak tightness pick-up unit and method, specifically a kind of apparatus and method being specifically designed to the civilian diaphragm gas meter of detection and leaking under actual gas transmission state.
Background technology
Current diaphragm gas meter sealing propertytest mode has water to try method, dry process, differential pressure method.Water examination method also claims bubble method, is the pressurized air being filled with certain pressure to tested table, and observing after immersion has bubble-free.Existing problems are, the too high meeting of the gaseous tension as being filled with makes too high being under pressure of seal of originally having leaked make it to compress or hold tightly to cause not leaking; Gaseous tension as being filled with is lower or be filled with by awp, and the bubble of leakage can not break through Underwater Pressure and surface tension of liquid, is difficult to observe minute leakage thus only according to vision.Dry process also claims direct pressure closing, is to the air being filled with 1.5 times of working pressures in tested table, and detecting tested table internal pressure with U-shaped pressure gauge or tensimeter has unchanged, if pressure reduces, then can be considered that gas meter, flow meter has leakage.Existing problems are, temperature influence is large, and sensitivity is low, and the test duration is long.Differential pressure method is that the tested table of same gas circuit and standard scale are placed in differential pressure pick-up both sides respectively, give tested table and standard scale inflating pressure simultaneously, automatically gas circuit is closed when reaching certain pressure, the equalizing valve in parallel with differential pressure pick-up is closed after pressure at two ends balance, at the appointed time sample analysis is carried out to its pressure reduction, thus judge whether gas meter, flow meter leaks.Existing problems are, " differential pressure pressurize " measures pressure reduction method is gas circuit is measured pressure test zero point as differential pressure pick-up, the measurement original bench mark point of differential pressure pick-up is on the air pressure of inflation, the method of differential pressure is measured under this high pressure, one is to make air pressure in gas circuit be subject to the impact of environment temperature and humidity, both sides are difficult to balance, easily cause zero migration to cause testing result inaccurate; Two be differential pressure pick-up detection resolution by " differential pressure pressurize " restriction and reduce, minute leakage be difficult to accurately is detected at short notice, this just means that detection efficiency is relatively low.
Above detection mode is except respective Problems existing, and whether maximum deficiency is sealing when can only detect gas meter, flow meter static state, reveal still lack effective detection mode for the movement axis rotated in actual fed gas process.Axis is one of leakage point of gas meter, flow meter, time user uses combustion gas, movement axis moves in not stall, if central axis is to gas leakage during a certain position, during another location, combustion gas is not leaked, then static air tightness detection apparatus just can not react this phenomenon exactly.
Summary of the invention
For solving the problem of above-mentioned technology, the purpose of this utility model proposes a kind of easy to operate, detection speed is fast, precision is high, sensitivity is good gas meter, flow meter dynamic airtightness device for fast detecting and method.
Gas meter, flow meter dynamic airtightness pick-up unit is made up of cylinder, gland bonnet, packing washer, sealable tank, support, spring, inflation solenoid valve, balanced solenoid valve, little differential pressure sensor, logical atmospheric electricity magnet valve etc., and it utilizes accurate little differential pressure sensor to judge whether tested table leaks by detecting the sealable tank internal pressure differences loading tested table and standard scale.
Before detection, first tested table and standard scale are put into each Autonomous test sealable tank, sealable tank size only holds gas meter, flow meter, remaining space is very little, gland bonnet is provided with and is connected and the opening corresponding with gas meter, flow meter air inlet/outlet and the leak detection mouth being connected little differential pressure sensor with gas source conduit, and the balanced solenoid valve and the logical atmospheric electricity magnet valve that now connect two sealable tanks are all opened.Pneumatic means is utilized to be depressed by gland bonnet, the acting force that support with spring supports gas meter, flow meter first allows the import and export of gas meter, flow meter seal, be enough to allow each packing washer compress along with the descending and spring of gland bonnet constantly compresses, gas source conduit is only kept clear with the gas circuit of gas meter, flow meter air inlet/outlet, descending gland bonnet and sealable tank compress again, balanced solenoid valve and logical atmospheric electricity magnet valve is closed after the ready to balance time, two sealable tanks formation take atmospheric pressure as the respective independently confined space of benchmark, and keep balance between two sealable tanks, pressure differential goes to zero, gas meter, flow meter self entirety is not by the impact of external force simultaneously.
During detection, open inflation solenoid valve, the source of the gas of selection certain pressure, certain flow is filled with tested table and standard scale, and two tables are all in gas transmission duty, movement axis rotates continuously, once tested table leaks, the pressure that tested table sealable tank remains in little space will rise, through the detection of certain hour, little differential pressure sensor produces corresponding differential pressure signal with tested table leakage rate, that is, by contrasting tested table and standard scale sealable tank internal pressure differences, can learn whether tested table leaks.
If after solenoid valve is given vent to anger in closedown inflating pressure, and close gas circuit keep pressure when reaching set pressure, then also can realize static to detect down.
In this proving installation, because tested confined space is very little, and differential pressure pick-up is using atmospheric pressure as testing zero point, so the high-resolution differential pressure transmitter of small-range (-50pa ~+50pa) can be selected, even minute leakage, little differential pressure sensor also can fast " unbalance ", so plant detection mode also can be described as the airtight detection method of balance-type type sound state, and method of testing is flexible, sensitivity and precision significantly improve.
Accompanying drawing explanation
According to drawings and embodiments the utility model is described in further detail below.
Fig. 1 is the gland bonnet of the utility model pick-up unit, the forward structure sketch of sealable tank mechanism.
Fig. 2 is the structure diagram of the utility model pick-up unit.
Fig. 3 is the spatial structure sketch of the gland bonnet of the utility model pick-up unit, jig, support, sealable tank.
In Fig. 1, Fig. 2, Fig. 3: 1, air inlet pipeline; 2, air intake opening; 3, leak detection mouth; 4, cylinder; 5, piston rod; 6, gland bonnet; 7, outlet pipe; 8, backstay; 9, gas outlet; 10, packing washer; 11, jig; 12, O-ring seal; 13, gas meter, flow meter; 14, support; 15, sealable tank; 16, spring; 17, solenoid valve is inflated; 18, general pressure table is inflated; 19, little differential pressure sensor; 20, balanced solenoid valve; 21, logical atmospheric electricity magnet valve; 22, tensimeter; 23, to give vent to anger solenoid valve; 24, flowmeter; 25, manual modulation valve; 26, base; 27, pneumatic linkage; 28, tensimeter; 29, to give vent to anger solenoid valve; 30, flowmeter; 31, manual modulation valve.
Embodiment
As shown in Figure 1, the piston rod 5 of cylinder 4 is connected with gland bonnet 6, gland bonnet 6 is provided with three openings, air intake opening 2 respectively, gas outlet 9 and Leak Detection mouth 3, air inlet/outlet is provided with packing washer 10, gas meter, flow meter support 14 is had in sealable tank 15, three spring 16 supporting brackets 14 bottom sealable tank 15, the gas meter, flow meter air inlet/outlet bottom of thread installs jig 11, jig 11 held by support 14, gas meter, flow meter is suspended in sealable tank 15 by jig, piston rod 5 is descending, gland bonnet 6 guides by backstay 8 and locates pushes down gas meter, flow meter air inlet/outlet, the stressed gas meter, flow meter that makes of gas meter, flow meter air inlet/outlet is also descending, spring 16 pressurized causes reacting force to support 14, support 14 is applied to jig 11, gas meter, flow meter held by jig 11 makes gland bonnet 6 air inlet/outlet packing washer 10 compress, gland bonnet 6 descending Contact Seal ring again 12 press tight sealed cans 15 again.
As shown in Figure 2, little differential pressure sensor 19 two ends are connected respectively to the Leak Detection mouth 3 of tested table and standard scale by pipeline, air inlet pipeline 1 is installed 15Kpa and is inflated general pressure table 18, and flowmeter 24 adjusts the flow of air pipe 7, and the pressure of gas outlet 9 observed by tensimeter 22.Open inflation solenoid valve 17, the source of the gas of selection certain pressure, certain flow is filled with tested table and standard scale, and two tables are all in gas transmission state, and movement axis rotates continuously.Once tested table has leakage, the gaseous tension that this gas meter, flow meter sealable tank 15 remains in little space will rise, through the detection of certain hour, little differential pressure sensor 19 produces corresponding differential pressure signal with tested table leakage rate, that is, by contrasting gas pressure difference in tested table and standard scale sealable tank, can learn whether tested table leaks.
As shown in Figure 3, pneumatic linkage 27 is passed through by outward-dipping for base 25 40 degree before test, sealable tank 15 is put into base 26, put into sealable tank 15 rear base 26 and return upright position, test terminate after can also by outward-dipping for base 25 40 degree to take out gas meter, flow meter.

Claims (3)

1. a gas meter, flow meter gas transmission state seal performance pick-up unit, comprise, cylinder, gland bonnet, sealable tank, spring, support, jig, source of the gas transfer conduit interface, Leak Detection mouth, little differential pressure sensor and source of the gas transfer conduit, it is characterized in that, described cylinder is located at the top of described gland bonnet, the piston rod of described cylinder is connected with described gland bonnet, and gland bonnet is provided with the described source of the gas transfer conduit interface corresponding with gas meter, flow meter air inlet/outlet upper-lower position in described sealable tank and described Leak Detection mouth; Described spring is placed on the inside bottom of sealable tank, described stentplacement is above spring, the root under screw thread is imported and exported in the combustion gas of clamping on gas meter, flow meter of described jig, jig both sides are placed into the groove of described pedestal upper end both sides, support is supported on jig both sides, is hung up by the gas meter, flow meter putting into sealable tank.
2. a kind of gas meter, flow meter gas transmission state seal performance pick-up unit according to claim 1, it is characterized in that, described gland bonnet interface is provided with packing washer, described sealable tank opening is provided with O-ring seal, the descending contact gas meter, flow meter of the described gland bonnet of the descending promotion of cylinder piston rod is imported and exported, gland bonnet is descending again, gland bonnet presses down the pressure of gas meter, flow meter and described reactive spring force makes press seal between the air inlet/outlet of gas meter, flow meter and packing washer, the gland bonnet described O-ring seal of descending contact press seal tank again, until gas meter, flow meter air inlet/outlet is tightly connected with described source of the gas transfer conduit.
3. a kind of gas meter, flow meter gas transmission state seal performance pick-up unit according to claim 1, it is characterized in that, described little differential pressure sensor two ends are connected with standard scale leak detection mouth with tested table leak detection mouth respectively.
CN201420687220.1U 2014-11-17 2014-11-17 A kind of gas meter, flow meter gas transmission state seal performance pick-up unit Expired - Fee Related CN204479250U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420687220.1U CN204479250U (en) 2014-11-17 2014-11-17 A kind of gas meter, flow meter gas transmission state seal performance pick-up unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420687220.1U CN204479250U (en) 2014-11-17 2014-11-17 A kind of gas meter, flow meter gas transmission state seal performance pick-up unit

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CN204479250U true CN204479250U (en) 2015-07-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106226005A (en) * 2016-07-22 2016-12-14 成都秦川科技发展有限公司 Gas meter, flow meter valve gap, seat leakage detection device
US20170059443A1 (en) * 2015-08-27 2017-03-02 Zhejiang Linix Motor Co., Ltd. Air-tightness test equipment for turbine reduction gearbox
CN110686841A (en) * 2019-10-08 2020-01-14 重庆科技学院 Air tightness detection device and detection method for double-cavity structure
CN111076779A (en) * 2019-12-03 2020-04-28 金卡智能集团股份有限公司 Metering detection system based on cloud server storage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170059443A1 (en) * 2015-08-27 2017-03-02 Zhejiang Linix Motor Co., Ltd. Air-tightness test equipment for turbine reduction gearbox
US10203263B2 (en) * 2015-08-27 2019-02-12 Zhejiang Linix Motor Co., Ltd. Air-tightness test equipment for turbine reduction gearbox
CN106226005A (en) * 2016-07-22 2016-12-14 成都秦川科技发展有限公司 Gas meter, flow meter valve gap, seat leakage detection device
CN110686841A (en) * 2019-10-08 2020-01-14 重庆科技学院 Air tightness detection device and detection method for double-cavity structure
CN110686841B (en) * 2019-10-08 2021-11-05 重庆科技学院 Air tightness detection device and detection method for double-cavity structure
CN111076779A (en) * 2019-12-03 2020-04-28 金卡智能集团股份有限公司 Metering detection system based on cloud server storage

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C14 Grant of patent or utility model
GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150715

Termination date: 20151117