CN203745156U - Workpiece leak detecting device - Google Patents

Workpiece leak detecting device Download PDF

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Publication number
CN203745156U
CN203745156U CN201320799894.6U CN201320799894U CN203745156U CN 203745156 U CN203745156 U CN 203745156U CN 201320799894 U CN201320799894 U CN 201320799894U CN 203745156 U CN203745156 U CN 203745156U
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CN
China
Prior art keywords
pressure
helium
pipes
sub
solenoid valve
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CN201320799894.6U
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Chinese (zh)
Inventor
赵志伟
眭敏
杨卓彬
杨兴刚
陈哲
李井泉
杨开学
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珠海格力电器股份有限公司
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Priority to CN201320799894.6U priority Critical patent/CN203745156U/en
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Publication of CN203745156U publication Critical patent/CN203745156U/en

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Abstract

The utility model discloses a workpiece leak detecting device comprising a gas collection tank, a first air charging device, an air exhausting device, a vacuum-pumping device, a second air charging device, a leak detector and a helium recovery device. The gas collection tank is lockable, and is used for accommodating a workpiece to be detected and collecting leak indication gas leaked by the workpiece to be detected; a quick coupling is arranged in the gas collection tank, the quick coupling is communicated with the first air charging device, the air exhausting device, the vacuum-pumping device, the second air charging device and the helium recovery device through pipelines, and the first air charging device, the air exhausting device, the vacuum-pumping device, the second air charging device and the helium recovery device are all arranged outside the gas collection tank, the leak detector is arranged outside the gas collection tank, and a suction gun of the leak detector can extend to the exterior of the gas collection tank. The workpiece leak detecting device is simple in structure, low in manufacture and maintenance cost, high in automation degree, strong in anti-interference capability and high in leak detection precision.

Description

Workpiece leakage detection apparatus

Technical field

The utility model relates to air conditioner production technical field, particularly relates to a kind of workpiece leakage detection apparatus for the workpiece of air-conditioner refrigerating system is hunted leak.

Background technology

Air conditioner is the refrigerant circulation product under pressure-driven, must ensure that the circulation system of whole cold-producing medium strictly seals without leaking.And the production of air conditioner comprises multiple tracks processing, connects operation, thereby need the connection workpiece of the refrigerant system of Dui Ge road manufacturing procedure production to implement leak detection reliably.

Current workpiece leak detection, generally adopts the open suction gun leak hunting method of vacuum box type leak detection or normal pressure.But, adopting vacuum box type leak detection, equipment investment is large, complex structure, and the maintenance cost of equipment is higher, and after " filling probe gas " operation, needs manually to move workpiece to vacuum tank, and automaticity is lower; Adopt the open suction gun leak detection of normal pressure, due to poor anti jamming capability, so precision of detecting leak gas is low.

Utility model content

Based on this, be necessary defect and deficiency for prior art, a kind of simple in structure, device fabrication maintenance cost is low, automaticity is high, antijamming capability is strong, precision of detecting leak gas is high workpiece leakage detection apparatus is provided.

The workpiece leakage detection apparatus providing for realizing the utility model object, comprises plenum chamber, the first aerating device, exhaust apparatus, vacuum extractor, the second aerating device, leakage detection instrument and helium recovery device;

Described plenum chamber is closed, for holding workpiece for measurement and collecting the probe gas that described workpiece for measurement leaks;

The inside of described plenum chamber is provided with rapid-acting coupling, and described rapid-acting coupling is communicated with outside described the first aerating device, exhaust apparatus, vacuum extractor, the second aerating device and the helium recovery device that are arranged on described plenum chamber respectively by pipeline;

Described leakage detection instrument is arranged on the outside of described plenum chamber, and the suction gun of described leakage detection instrument may extend to the inside of described plenum chamber.

In an embodiment, the inside of described plenum chamber is also provided with flow-disturbing blower fan therein, and described flow-disturbing blower fan purges for the gas of inside to described plenum chamber, the helium dividing potential drop of the inside of plenum chamber described in balance.

In an embodiment, described the first aerating device comprises the first pressure gauge, the first solenoid valve and air pressure pan therein;

Described air pressure pan is communicated with described rapid-acting coupling by the first sub-pipes of described pipeline;

Described the first pressure gauge and the first solenoid valve are successively set on described the first sub-pipes, and between described air pressure pan and described rapid-acting coupling;

When described the first solenoid valve is during in opening, described air pressure pan is filled with air by described rapid-acting coupling in described workpiece for measurement.

In an embodiment, described the first aerating device also comprises the first pressure switch and high-pressure air tube therein;

Described high-pressure air tube is communicated with described air pressure pan by the first sub-pipes;

Described the first pressure switch is arranged on described high-pressure air tube.

In an embodiment, described exhaust apparatus comprises the second solenoid valve and air low pressure tank therein;

Described air low pressure tank is communicated with described rapid-acting coupling by the second sub-pipes of described pipeline, and described the second solenoid valve is arranged on described the second sub-pipes, and between described air low pressure tank and described rapid-acting coupling;

When described the second solenoid valve is during in opening, the pressure-air in described workpiece for measurement is discharged by described rapid-acting coupling, described the second sub-pipes, described air low pressure tank successively.

In an embodiment, described exhaust apparatus also comprises the first exhaust box therein, and described the first exhaust box is arranged on the end of described the second sub-pipes.

In an embodiment, described vacuum extractor comprises the second pressure switch, the 3rd solenoid valve and the first mechanical pump therein;

Described the first mechanical pump is communicated with described rapid-acting coupling by the 3rd sub-pipes of described pipeline, and described the second pressure switch and described the 3rd solenoid valve are successively set on described the 3rd sub-pipes, and between described the first mechanical pump and described rapid-acting coupling.

In an embodiment, described vacuum extractor also comprises the second exhaust box therein, and described the second exhaust box is arranged on the end of described the 3rd sub-pipes.

In an embodiment, described the second aerating device comprises the 4th solenoid valve, the second pressure gauge and helium pressure pan therein;

Described helium pressure pan is communicated with described rapid-acting coupling by the 4th sub-pipes of described pipeline;

Described the 4th solenoid valve is arranged on described the 4th sub-pipes, and between described helium pressure pan and described rapid-acting coupling;

Described the second pressure gauge is arranged on described helium pressure pan, is used for detecting the helium pressure in described helium pressure pan;

When described the 4th solenoid valve is during in opening, described helium pressure pan is filled with helium by described rapid-acting coupling in described workpiece for measurement.

In an embodiment, described the second aerating device also comprises oil strainer, compressor, the 5th solenoid valve and helium tank group therein;

The end of described the 4th sub-pipes is connected with described helium tank group;

Described oil strainer, compressor, the 5th solenoid valve are successively set on described the 4th sub-pipes between described helium pressure pan and described helium tank group;

The outlet of described oil strainer is provided with Nitrogen Detector.

In an embodiment, described helium recovery device comprises the 6th solenoid valve, helium low pressure tank, the 3rd pressure gauge, the 3rd pressure switch and the second mechanical pump therein;

Described helium low pressure tank and the second mechanical pump are communicated with described rapid-acting coupling by the 5th sub-pipes of described pipeline successively;

Described the 3rd pressure gauge is arranged on described helium low pressure tank, is used for detecting the helium pressure in described helium low pressure tank;

Described the 6th solenoid valve and the 3rd pressure switch are arranged on described the 5th sub-pipes, and described the 6th solenoid valve is between described helium low pressure tank and described rapid-acting coupling, and described the 3rd pressure switch is between described helium low pressure tank and the second mechanical pump.

In an embodiment, described helium recovery device also comprises the 7th solenoid valve, the 8th solenoid valve and the 6th pipeline therein;

One end of described the 6th pipeline is communicated with described the 4th sub-pipes between described compressor and the 5th solenoid valve, and the other end is communicated with described the 5th sub-pipes between described helium low pressure tank and the 3rd pressure switch;

Described the 7th solenoid valve is arranged on described the 6th pipeline;

Described the 8th solenoid valve is arranged on the end of described the 5th sub-pipes;

The end of described the 5th sub-pipes is communicated with described the 4th sub-pipes between described compressor and the 5th solenoid valve.

In an embodiment, the air pressure in described air pressure pan is 4.0-4.2Mpa therein, and the air pressure in described high-pressure air tube is 4.2-4.5Mpa.

In an embodiment, the helium pressure in described helium pressure pan is 4.0-4.2Mpa therein, and concentration is 5%-60%; Helium pressure in described helium tank group is 4.2-4.5Mpa, and concentration is 20%-70%.

The beneficial effects of the utility model: the workpiece leakage detection apparatus that the utility model provides, first, by the first aerating device and exhaust apparatus are set, carries out detecting leakage to the workpiece for measurement in plenum chamber; Then,, by vacuum extractor is set, the workpiece for measurement in plenum chamber is vacuumized; Then, by the second aerating device and leakage detection instrument are set, the workpiece for measurement in plenum chamber fills probe gas, after leaving standstill, hunts leak again; Finally, by helium recovery device is set, probe gas is reclaimed, recycle, reduce costs, and simple in structure, device fabrication and maintenance cost are low.When work, workpiece for measurement is placed in to the inside of plenum chamber, and workpiece for measurement is docked with rapid-acting coupling, after the family of power and influence of plenum chamber closes, plenum chamber forms an airtight chamber, successively to the workpiece for measurement in plenum chamber carry out detecting leakage, vacuumize, fill probe gas, leave standstill, leak detection, probe gas recovery process, antijamming capability is strong, accuracy of detection is high, automaticity is high.The workpiece leakage detection apparatus that the utility model provides, simple in structure, device fabrication and maintenance cost is low, automaticity is high, antijamming capability is strong, precision of detecting leak gas is high.

Brief description of the drawings

In order to make object, technical scheme and the advantage of workpiece leakage detection apparatus of the present utility model clearer, below in conjunction with concrete drawings and the specific embodiments, the utility model workpiece leakage detection apparatus is further elaborated.

Fig. 1 is the structural drawing of an embodiment of workpiece leakage detection apparatus of the present utility model;

Fig. 2 is the concrete structure schematic diagram of the workpiece leakage detection apparatus shown in Fig. 1;

Fig. 3 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, standing after 3 minutes, does not open built-in flow-disturbing blower fan, the leak rate distribution schematic diagram of finding;

Fig. 4 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, standing after 3 minutes, opens built-in flow-disturbing blower fan, the leak rate distribution schematic diagram of finding;

Fig. 5 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, leave standstill certain hour (horizontal ordinate), open built-in flow-disturbing blower fan, flow-disturbing 3-60s, the leak rate of finding (ordinate) is with the distribution schematic diagram of time of repose (horizontal ordinate);

Wherein, plenum chamber 100, the first aerating device 200, exhaust apparatus 300, vacuum extractor 400, the second aerating device 500, leakage detection instrument 600, helium recovery device 700, rapid-acting coupling 110, flow-disturbing blower fan 120, workpiece for measurement 130, the first sub-pipes 10, the first pressure gauge 210, the first solenoid valve 220, air pressure pan 230, the first pressure switch 240, high-pressure air tube 250, the second sub-pipes 20, the second solenoid valve 310, air low pressure tank 320, the 3rd sub-pipes 30, the second pressure switch 410, the 3rd solenoid valve 420, the first mechanical pump 430, exhaust box 440, the 4th sub-pipes 40, the 4th solenoid valve 510, helium pressure pan 520, the second pressure gauge 530, oil strainer 540, compressor 550, the 5th solenoid valve 560, helium tank group 570, suction gun 610, the 5th sub-pipes 50, the 6th solenoid valve 710, helium low pressure tank 720, the 3rd pressure gauge 730 the 3rd pressure gauge 730, the 3rd pressure switch 740, the second mechanical pump 750, the 7th solenoid valve 760, the 8th solenoid valve 770, the 6th pipeline 60.

Embodiment

The embodiment of the workpiece leakage detection apparatus that the utility model provides, as shown in Figures 1 to 5.

An embodiment of the workpiece leakage detection apparatus that the utility model provides, as shown in Figure 1, comprises plenum chamber 100, the first aerating device 200, exhaust apparatus 300, vacuum extractor 400, the second aerating device 500, leakage detection instrument 600 and helium recovery device 700; Plenum chamber 100 is closed, for holding workpiece for measurement 130 and collecting the probe gas that described workpiece for measurement 130 leaks, the inside of plenum chamber 100 is provided with rapid-acting coupling 110, rapid-acting coupling 110 is communicated with the first outside aerating device 200, exhaust apparatus 300, vacuum extractor 400, the second aerating device 500 and the helium recovery device 700 that are arranged on plenum chamber 100 respectively by pipeline, leakage detection instrument 600 is arranged on the outside of plenum chamber 100, and the suction gun 610 of leakage detection instrument 600 may extend to the inside of plenum chamber 100.When work, workpiece for measurement 130 is placed in to the inside of plenum chamber 100, and workpiece for measurement 130 is docked with rapid-acting coupling 110, after the family of power and influence of plenum chamber 100 closes, plenum chamber 100 forms an airtight chamber.

The workpiece leakage detection apparatus that the utility model provides, first, by the first aerating device and exhaust apparatus are set, carries out detecting leakage to the workpiece for measurement in plenum chamber; Then,, by vacuum extractor is set, the workpiece for measurement in plenum chamber is vacuumized; Then, by the second aerating device and leakage detection instrument are set, the workpiece for measurement in plenum chamber fills probe gas, after leaving standstill, hunts leak again; Finally, by helium recovery device is set, probe gas is reclaimed, recycle, reduce costs.Traditional vacuum box type leak detection, need in vacuum (below 50Pa) environment, carry out, operation is many, container leakproofness requires high, support equipment is many, need to be equipped with multistage vacuum pump, device structure complexity, manufacture and maintenance cost are high, and after " filling probe gas " operation, need manually to move workpiece to vacuum tank, automaticity is lower.The open suction gun leak detection of normal pressure is carried out in atmospheric pressure environment, does not need leakproofness container, but poor anti jamming capability, precision of detecting leak gas is low.And the workpiece leakage detection apparatus that the utility model provides in use, workpiece for measurement is placed in to the inside of plenum chamber, and workpiece for measurement is docked with rapid-acting coupling, after the family of power and influence of plenum chamber closes, plenum chamber forms an airtight chamber, successively to the workpiece for measurement in plenum chamber carry out detecting leakage, vacuumize, fill probe gas, leave standstill, leak detection, probe gas recovery process, simple in structure, device fabrication and maintenance cost are low, and antijamming capability is strong, precision of detecting leak gas is high, and automaticity is high.

As a kind of embodiment, participate in Fig. 1 to Fig. 2, the inside of plenum chamber 100 is also provided with flow-disturbing blower fan 120, and flow-disturbing blower fan 120 purges for the gas of the inside to plenum chamber 100, the helium dividing potential drop of the inside of balancing gas collecting case 100.By flow-disturbing blower fan being set in the inside of plenum chamber, fill and show gas leakage at the workpiece for measurement in plenum chamber, before hunting leak after leaving standstill, open flow-disturbing blower fan, can improve the uniformity coefficient of helium dividing potential drop, thereby reduce leak detection time of repose, promote leak detection efficiency.

Below, referring to Fig. 2, the concrete structure of each ingredient of the workpiece leakage detection apparatus that the utility model is provided describes:

Above-mentioned pipeline comprises the first sub-pipes 10, the second sub-pipes 20, the 3rd sub-pipes 30, the 4th sub-pipes 40 and the 5th sub-pipes 50.

As a kind of embodiment, the first aerating device 200 comprises the first pressure gauge 210, the first solenoid valve 220 and air pressure pan 230, air pressure pan 230 is communicated with rapid-acting coupling 110 by the first sub-pipes 10, the first pressure gauge 210 and the first solenoid valve 220 are successively set on the first sub-pipes 10, and between air pressure pan 230 and rapid-acting coupling 110.When the first solenoid valve 220 is during in opening, air pressure pan 230 is filled with air by rapid-acting coupling 110 in workpiece for measurement 130.The first pressure gauge 210, after finishing in inflation, detects the pressure drop of the first sub-pipes 10.Specific implementation process is: after inflation finishes, close the first solenoid valve 220, and carry out pressurize in the first Preset Time (according to workpiece for measurement 130 volume size values), be generally 10-15s, by detecting the voltage drop value △ P1 of the first pressure gauge 210 between hold period, judge that whether detecting leakage is qualified.If △ P1 is greater than default voltage drop value, judge that detecting leakage is defective, start the instruction of reporting to the police.

Further, the first aerating device 200 also comprises the first pressure switch 240 and high-pressure air tube 250, high-pressure air tube 250 is communicated with air pressure pan 230 by the first sub-pipes 10, the first pressure switch 240 controls the unlatching of high-pressure air tube 250 or cuts out, the first pressure switch 240 can be arranged on high-pressure air tube 250, also can be arranged on the first sub-pipes 10 between high-pressure air tube 250 and air pressure pan 230 (referring to Fig. 2).Air pressure scope in air pressure pan 230 is 4.0-4.2Mpa, and the air pressure in high-pressure air tube 250 is 4.2-4.5Mpa.After the air pressure in air pressure pan 230 reduces, for example, pressure decreased is to 4.0Mpa, the first pressure switch 240 obtains electric-opening, and automatic delay function, in the time that the first pressure switch 240 is opened, high-pressure air tube 250 is communicated with air pressure pan 230, supplement air to air pressure pan 230, be pressurized to 4.2Mpa, better to meet leak detection requirement.

As a kind of embodiment, exhaust apparatus 300 comprises the second solenoid valve 310 and air low pressure tank 320, air low pressure tank 320 is communicated with rapid-acting coupling 110 by the second sub-pipes 20, the second solenoid valve 310 is arranged on the second sub-pipes 20, and between air low pressure tank 320 and rapid-acting coupling 110.In inflation, after pressurize finishes, the second solenoid valve 310 is opened and time-delay closings, and when the second solenoid valve 310 is during in opening, the pressure-air in workpiece for measurement 130 is discharged by rapid-acting coupling 110, the second sub-pipes 20, air low pressure tank 320 successively.

As a kind of embodiment, vacuum extractor 400 comprises the second pressure switch 410, the 3rd solenoid valve 420 and the first mechanical pump 430, the first mechanical pump 430 is communicated with rapid-acting coupling 110 by the 3rd sub-pipes 30, the second pressure switch 410 and the 3rd solenoid valve 420 are successively set on the 3rd sub-pipes 30, and between the first mechanical pump 430 and rapid-acting coupling 110.After exhaust finishes, the second pressure switch 410, the 3rd solenoid valve 420 and the first mechanical pump 430 obtain electric-opening simultaneously, vacuumize.After the second pressure switch 410 detects the 3rd sub-pipes 30 to reach default vacuum tightness (because the 3rd sub-pipes 30 is communicated with workpiece for measurement 130 by rapid-acting coupling 110, therefore the vacuum tightness in the 3rd sub-pipes 30 is identical with the vacuum tightness in workpiece for measurement 130), the second pressure switch 410, the 3rd solenoid valve 420 and the first mechanical pump 430, by automatic delay function, finish to vacuumize operation.

Preferably, as a kind of embodiment, workpiece leakage detection apparatus of the present utility model also comprises exhaust box 440, and exhaust box 440 is arranged on the end of the second sub-pipes 20 and/or the 3rd sub-pipes 30.Like this, in deairing step, the air that air low pressure tank 320 is discharged arrives exhaust box 440 along the second sub-pipes 20, after exhaust box 440 denoisings, discharges.Or vacuumizing in operation, the air of extracting out through the first mechanical pump 430 arrives exhaust box 440 along the 3rd sub-pipes 30, discharges after exhaust box 440 denoisings.

Preferably, the end of the second sub-pipes 20 is connected with the end of the 3rd sub-pipes 30, and exhaust box 440 is arranged on the end junction of the second sub-pipes 20 and the 3rd sub-pipes 30.

As a kind of embodiment, the second aerating device 500 comprises the 4th solenoid valve 510, helium pressure pan 520 and the second pressure gauge 530, helium pressure pan 520 is communicated with rapid-acting coupling 110 by the 4th sub-pipes 40, the 4th solenoid valve 510 is arranged on the 4th sub-pipes 40, and between helium pressure pan 520 and rapid-acting coupling 110, the second pressure gauge 530 is arranged on helium pressure pan 520, is used for detecting the helium pressure in helium pressure pan 520; When the 4th solenoid valve 510 is during in opening, helium pressure pan 520 is filled with helium by rapid-acting coupling 110 in workpiece for measurement.

Further, the second aerating device 500 also comprises oil strainer 540, compressor 550, the 5th solenoid valve 560 and helium tank group 570, the end of the 4th sub-pipes 40 is connected with helium tank group 570, oil strainer 540, compressor 550, the 5th solenoid valve 560 are successively set on the 4th sub-pipes 40 between helium pressure pan 520 and helium tank group 570, the outlet of oil strainer 540 is provided with Nitrogen Detector, and Nitrogen Detector is for detection of the concentrations of helium being filled with.

Concentrations of helium in helium pressure pan 520 is 5%-60%, and the concentrations of helium in helium tank group 570 is 20%-70%.For example, when Nitrogen Detector detects after concentrations of helium is lower than the default value of rolling off the production line of concentrations of helium (10%), helium pressure pan 520 automatic switching on atmosphere carry out exhaust, compressor 550, the 5th solenoid valve 560 are opened afterwards, helium tank group 570 is filled helium to helium pressure pan 520, guarantees that concentrations of helium is up to standard.

The inspection of tradition helium is generally used high-pure helium (concentration is 80%-100%), and helium is strategic materials, the high buying difficulty of cost.The workpiece leakage detection apparatus that the utility model provides is taked to mix helium (concentration is 5%-60%) workpiece is shown to leakage, can reduce helium consumption, uses low-quality helium, reduces costs.

The workpiece leakage detection apparatus that the utility model provides in use, by the second aerating device 500 being filled with after helium in workpiece for measurement 130, leave standstill a period of time, then open flow-disturbing blower fan 120 and carry out flow-disturbing, after flow-disturbing finishes, the suction gun 610 of controlling plenum chamber 100 inside by leakage detection instrument 600 carries out suction gun leak detection to workpiece for measurement 130, can judge whether the overall leak rate of workpiece for measurement 130 conforms to quality requirements according to the detected value of leakage detection instrument 600.

As a kind of embodiment, the workpiece leakage detection apparatus that the utility model provides also comprises warning device, warning device is connected with leakage detection instrument 600, the second pressure switch 410 and the first pressure gauge 210 respectively, in the time that the voltage drop value △ P1 of the first pressure gauge 210 between hold period is greater than default voltage drop value, warning device is reported to the police and/or is pointed out detecting leakage defective; Do not reach after default vacuum tightness when the second pressure switch 410 detects the 3rd sub-pipes 30, warning device is reported to the police and/or prompting vacuumizes defective; When the detected value of leakage detection instrument 600 exceedes after default detected value scope, warning device is reported to the police and/or prompting is hunted leak defective.

As a kind of embodiment, helium recovery device 700 comprises the 6th solenoid valve 710, helium low pressure tank 720, the 3rd pressure gauge 730, the 3rd pressure switch 740 and the second mechanical pump 750, helium low pressure tank 720 and the second mechanical pump 750 are communicated with rapid-acting coupling 110 by the 5th sub-pipes 50 successively, the 3rd pressure gauge 730 is arranged on helium low pressure tank 720, the 6th solenoid valve 710 and the 3rd pressure switch 740 are arranged on the 5th sub-pipes 50, the 6th solenoid valve 710 is between helium low pressure tank 720 and rapid-acting coupling 110, the 3rd pressure switch 740 is between helium low pressure tank 720 and the second mechanical pump 750.

After suction gun leak detection finishes, the 6th solenoid valve 710 and the 3rd pressure gauge 730 are opened, and the helium in workpiece for measurement 130 flows to helium low pressure tank 720 along the 5th sub-pipes.When pressure drop that the 3rd pressure gauge 730 detects helium low pressure tank 720 under preset pressure in limited time, the 3rd pressure switch 740 and the second mechanical pump 750 start, by the helium recovery in workpiece for measurement 130 and helium low pressure tank 720 to negative pressure.

Preferably, helium recovery device 700 also comprises the 7th solenoid valve 760, the 8th solenoid valve 770 and the 6th pipeline 60, one end of the 6th pipeline 60 is communicated with the 4th sub-pipes 40 between compressor 550 and the 5th solenoid valve 560, the other end is communicated with the 5th sub-pipes 50 between helium low pressure tank 720 and the 3rd pressure switch 740, the 7th solenoid valve 760 is arranged on the 6th pipeline 60, the 8th solenoid valve 770 is arranged on the end of the 5th sub-pipes 50, and the end of the 5th sub-pipes 50 is communicated with the 4th sub-pipes 40 between compressor 550 and the 5th solenoid valve 560.

Helium pressure scope in helium pressure pan 520 is 4.0-4.2Mpa, and the helium pressure in helium tank group 570 is 4.2-4.5Mpa.The second pressure gauge 530 is arranged on helium pressure pan 520, detects the helium pressure in helium pressure pan 520.When detecting the helium pressure in helium pressure pan 520, the second pressure gauge 530 drops to after preset value, the 7th solenoid valve 760, the 8th solenoid valve 770 are opened, compressor 550 starts, high-pressure helium in workpiece for measurement 130 is pressed in helium pressure pan 520 by helium low pressure tank 720, the 6th pipeline 60, compressor 550, or by the 3rd pressure switch 740, the second mechanical pump 750, end along the 5th sub-pipes 50 flows into the 4th sub-pipes 40, is pressed in helium pressure pan 520 by compressor 550.In line flow procedure, for multi-work piece is synchronously hunted leak, and public gas-holder, so operting differential pressure sustainable existence.After helium recovery finishes, workpiece is exited from plenum chamber, leak detection finishes.

Workpiece leakage detection apparatus of the present utility model, in plenum chamber, workpiece for measurement is carried out detecting leakage, finds time, fills probe gas, leaves standstill, hunts leak, reclaims probe gas, avoid after " filling probe gas " operation, manually workpiece being moved in traditional leak detection operation the operation of vacuum tank, simple in structure, device fabrication and maintenance cost are low, and automaticity is higher.And in the inside that workpiece for measurement is placed in to plenum chamber, after workpiece for measurement is docked with rapid-acting coupling, the family of power and influence of closure set gas tank, plenum chamber forms an airtight chamber, and anti-interference is good.

Referring to Fig. 3, Fig. 3 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, standing after 3 minutes, does not open built-in flow-disturbing blower fan, the leak rate distribution schematic diagram of finding.

Referring to Fig. 4, Fig. 4 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, standing after 3 minutes, opens built-in flow-disturbing blower fan, the leak rate distribution schematic diagram of finding.

Referring to Fig. 5, Fig. 5 is for mixing helium by referance leak (leak rate: 2.58E-5Pam3s-1) to filling 4.2MPa concentration 50% in workpiece for measurement, leave standstill certain hour (horizontal ordinate), open built-in flow-disturbing blower fan, flow-disturbing 3-60s, the leak rate of finding (ordinate) is with the distribution schematic diagram of time of repose (horizontal ordinate).

Confirm by experiment, the workpiece leakage detection apparatus that the utility model provides in use, being filled with after helium in workpiece for measurement, leave standstill 2-10 minute, then open the built-in flow-disturbing blower fan of plenum chamber and carry out flow-disturbing, the flow-disturbing time is 3-60 second, can greatly improve the uniformity coefficient of helium dividing potential drop, reduce leak detection time of repose, improve precision of detecting leak gas, promote leak detection efficiency.

As a kind of embodiment, on the 4th sub-pipes 40 between the 4th solenoid valve 510 and helium pressure pan 520, a referance leak and pressure gauge are set, mainly realize the detection of concentrations of helium and pressure, for the calibration of leakage detection instrument precision.Concrete calibration steps: ensure that pressure gauge indicating value pressure is in 4.0-4.2MPa scope, then by leakage detection instrument 600 suction gun 610 alignment criteria small openings, if Normal Alarm explanation leakage detection instrument Detection capability, concentrations of helium, pressure are in normal range, to look into reason as can't check and get rid of.

The workpiece leakage detection apparatus that the utility model provides, when work, workpiece for measurement is placed in to the inside of plenum chamber, and workpiece for measurement is docked with rapid-acting coupling, after the family of power and influence of plenum chamber closes, plenum chamber forms an airtight chamber, successively to the workpiece for measurement in plenum chamber carry out detecting leakage, vacuumize, fill probe gas, leave standstill, leak detection, probe gas recovery process, simple in structure, device fabrication machine maintenance cost is low, antijamming capability is strong, and precision of detecting leak gas is high, and automaticity is high.By flow-disturbing blower fan being set in the inside of plenum chamber, fill probe gas at the workpiece for measurement in plenum chamber, before hunting leak after leaving standstill, open flow-disturbing blower fan, can improve the uniformity coefficient of helium dividing potential drop, the time of repose thereby the workpiece leakage detection apparatus that reducing the utility model provides is hunted leak in use, promotes leak detection efficiency.The workpiece leakage detection apparatus that the utility model provides, simple in structure, manufacture maintenance cost low, automaticity is high, precision of detecting leak gas is high, speed is fast, antijamming capability is strong.

The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (13)

1. a workpiece leakage detection apparatus, is characterized in that, comprises plenum chamber, the first aerating device, exhaust apparatus, vacuum extractor, the second aerating device, leakage detection instrument and helium recovery device;
Described plenum chamber is closed, for holding workpiece for measurement and collecting the probe gas that described workpiece for measurement leaks;
The inside of described plenum chamber is provided with rapid-acting coupling, and described rapid-acting coupling is communicated with outside described the first aerating device, exhaust apparatus, vacuum extractor, the second aerating device and the helium recovery device that are arranged on described plenum chamber respectively by pipeline;
Described leakage detection instrument is arranged on the outside of described plenum chamber, and the suction gun of described leakage detection instrument may extend to the inside of described plenum chamber.
2. workpiece leakage detection apparatus according to claim 1, is characterized in that, the inside of described plenum chamber is also provided with flow-disturbing blower fan, and described flow-disturbing blower fan purges for the gas of inside to described plenum chamber, the helium dividing potential drop of the inside of plenum chamber described in balance.
3. workpiece leakage detection apparatus according to claim 1 and 2, is characterized in that, described the first aerating device comprises the first pressure gauge, the first solenoid valve and air pressure pan;
Described air pressure pan is communicated with described rapid-acting coupling by the first sub-pipes of described pipeline;
Described the first pressure gauge and the first solenoid valve are successively set on described the first sub-pipes, and between described air pressure pan and described rapid-acting coupling;
When described the first solenoid valve is during in opening, described air pressure pan is filled with air by described rapid-acting coupling in described workpiece for measurement.
4. workpiece leakage detection apparatus according to claim 3, is characterized in that, described the first aerating device also comprises the first pressure switch and high-pressure air tube;
Described high-pressure air tube is communicated with described air pressure pan by the first sub-pipes of described pipeline;
Described the first pressure switch is arranged on described high-pressure air tube.
5. workpiece leakage detection apparatus according to claim 1 and 2, is characterized in that, described exhaust apparatus comprises the second solenoid valve and air low pressure tank;
Described air low pressure tank is communicated with described rapid-acting coupling by the second sub-pipes of described pipeline, and described the second solenoid valve is arranged on described the second sub-pipes, and between described air low pressure tank and described rapid-acting coupling;
When described the second solenoid valve is during in opening, the pressure-air in described workpiece for measurement is discharged by described rapid-acting coupling, described the second sub-pipes, described air low pressure tank successively.
6. workpiece leakage detection apparatus according to claim 5, is characterized in that, described exhaust apparatus also comprises the first exhaust box;
Described the first exhaust box is arranged on the end of described the second sub-pipes.
7. workpiece leakage detection apparatus according to claim 1 and 2, is characterized in that, described vacuum extractor comprises the second pressure switch, the 3rd solenoid valve and the first mechanical pump;
Described the first mechanical pump is communicated with described rapid-acting coupling by the 3rd sub-pipes of described pipeline, and described the second pressure switch and described the 3rd solenoid valve are successively set on described the 3rd sub-pipes, and between described the first mechanical pump and described rapid-acting coupling.
8. workpiece leakage detection apparatus according to claim 7, is characterized in that, described vacuum extractor also comprises the second exhaust box;
Described the second exhaust box is arranged on the end of described the 3rd sub-pipes.
9. workpiece leakage detection apparatus according to claim 1 and 2, is characterized in that, described the second aerating device comprises the 4th solenoid valve, the second pressure gauge and helium pressure pan;
Described helium pressure pan is communicated with described rapid-acting coupling by the 4th sub-pipes of described pipeline;
Described the 4th solenoid valve is arranged on described the 4th sub-pipes, and between described helium pressure pan and described rapid-acting coupling;
Described the second pressure gauge is arranged on described helium pressure pan, is used for detecting the helium pressure in described helium pressure pan;
When described the 4th solenoid valve is during in opening, described helium pressure pan is filled with helium by described rapid-acting coupling in described workpiece for measurement.
10. workpiece leakage detection apparatus according to claim 9, is characterized in that, described the second aerating device also comprises oil strainer, compressor, the 5th solenoid valve and helium tank group;
The end of described the 4th sub-pipes is connected with described helium tank group;
Described oil strainer, compressor, the 5th solenoid valve are successively set on described the 4th sub-pipes between described helium pressure pan and described helium tank group;
The outlet of described oil strainer is provided with Nitrogen Detector.
11. workpiece leakage detection apparatus according to claim 10, is characterized in that, described helium recovery device comprises the 6th solenoid valve, helium low pressure tank, the 3rd pressure gauge, the 3rd pressure switch and the second mechanical pump;
Described helium low pressure tank and the second mechanical pump are communicated with described rapid-acting coupling by the 5th sub-pipes of described pipeline successively;
Described the 3rd pressure gauge is arranged on described helium low pressure tank, is used for detecting the helium pressure in described helium low pressure tank;
Described the 6th solenoid valve and the 3rd pressure switch are arranged on described the 5th sub-pipes, and described the 6th solenoid valve is between described helium low pressure tank and described rapid-acting coupling, and described the 3rd pressure switch is between described helium low pressure tank and the second mechanical pump.
12. workpiece leakage detection apparatus according to claim 11, is characterized in that, described helium recovery device also comprises the 7th solenoid valve, the 8th solenoid valve and the 6th pipeline;
One end of described the 6th pipeline is communicated with described the 4th sub-pipes between described compressor and the 5th solenoid valve, and the other end is communicated with described the 5th sub-pipes between described helium low pressure tank and the 3rd pressure switch;
Described the 7th solenoid valve is arranged on described the 6th pipeline;
Described the 8th solenoid valve is arranged on the end of described the 5th sub-pipes;
The end of described the 5th sub-pipes is communicated with described the 4th sub-pipes between described compressor and the 5th solenoid valve.
13. workpiece leakage detection apparatus according to claim 4, is characterized in that, the air pressure in described air pressure pan is 4.0-4.2Mpa, and the air pressure in described high-pressure air tube is 4.2-4.5Mpa.
CN201320799894.6U 2013-12-05 2013-12-05 Workpiece leak detecting device CN203745156U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104132786A (en) * 2014-07-31 2014-11-05 国家电网公司 Rapid leakage detecting method suitable for extra-high voltage converter transformers
CN104180950A (en) * 2014-08-21 2014-12-03 佛山市美的清湖净水设备有限公司 Water purifying equipment leakproofness detection system and method
CN104677567A (en) * 2015-03-23 2015-06-03 苏州鸿普精密模具有限公司 Helium supply device with condenser helium leakage detector
CN104697726A (en) * 2013-12-05 2015-06-10 珠海格力电器股份有限公司 Workpiece leak detection device
CN104713685A (en) * 2015-02-10 2015-06-17 湖南省精一自动化有限公司 Vacuum box type leakage inspector and inspection method
CN104807604A (en) * 2015-05-19 2015-07-29 珠海普乐美厨卫有限公司 Water purifier detection equipment and detection method utilizing water purifier detection equipment
CN105179927A (en) * 2015-06-11 2015-12-23 成都威登阀门技术有限公司 Helium gas recovery apparatus
CN105738035A (en) * 2014-12-08 2016-07-06 浙江三花汽车零部件有限公司 Device with gas recovery unit and method of application thereof
CN109000860A (en) * 2018-08-28 2018-12-14 珠海格力电器股份有限公司 A kind of water system leakage detection apparatus and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104697726A (en) * 2013-12-05 2015-06-10 珠海格力电器股份有限公司 Workpiece leak detection device
CN104132786A (en) * 2014-07-31 2014-11-05 国家电网公司 Rapid leakage detecting method suitable for extra-high voltage converter transformers
CN104180950A (en) * 2014-08-21 2014-12-03 佛山市美的清湖净水设备有限公司 Water purifying equipment leakproofness detection system and method
CN104180950B (en) * 2014-08-21 2017-06-13 佛山市美的清湖净水设备有限公司 Purifier sealing propertytest system and method
CN105738035A (en) * 2014-12-08 2016-07-06 浙江三花汽车零部件有限公司 Device with gas recovery unit and method of application thereof
CN104713685A (en) * 2015-02-10 2015-06-17 湖南省精一自动化有限公司 Vacuum box type leakage inspector and inspection method
CN104677567A (en) * 2015-03-23 2015-06-03 苏州鸿普精密模具有限公司 Helium supply device with condenser helium leakage detector
CN104677567B (en) * 2015-03-23 2017-04-19 苏州鸿普精密模具有限公司 Helium supply device with condenser helium leakage detector
CN104807604A (en) * 2015-05-19 2015-07-29 珠海普乐美厨卫有限公司 Water purifier detection equipment and detection method utilizing water purifier detection equipment
CN105179927A (en) * 2015-06-11 2015-12-23 成都威登阀门技术有限公司 Helium gas recovery apparatus
CN105179927B (en) * 2015-06-11 2018-03-06 成都威登阀门技术有限公司 Helium recovery unit
CN109000860A (en) * 2018-08-28 2018-12-14 珠海格力电器股份有限公司 A kind of water system leakage detection apparatus and method

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