CN201707180U - Helium mass spectrum leakage detecting fixture for welding line of evaporator tube plate - Google Patents

Helium mass spectrum leakage detecting fixture for welding line of evaporator tube plate Download PDF

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Publication number
CN201707180U
CN201707180U CN2010202450753U CN201020245075U CN201707180U CN 201707180 U CN201707180 U CN 201707180U CN 2010202450753 U CN2010202450753 U CN 2010202450753U CN 201020245075 U CN201020245075 U CN 201020245075U CN 201707180 U CN201707180 U CN 201707180U
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CN
China
Prior art keywords
slide core
seal ring
evaporator
tube
tube plate
Prior art date
Application number
CN2010202450753U
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Chinese (zh)
Inventor
刘安平
Original Assignee
刘安平
Priority date (The priority date 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 date listed.)
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Publication date
Priority to CN200920059286.5 priority Critical
Priority to CN200920059286 priority
Application filed by 刘安平 filed Critical 刘安平
Priority to CN2010202450753U priority patent/CN201707180U/en
Application granted granted Critical
Publication of CN201707180U publication Critical patent/CN201707180U/en

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Abstract

The utility model provides a helium mass spectrum leakage detecting fixture for the welding line of an evaporator tube plate, which comprises a cylinder, movable cores, a movable seal ring and a static seal ring, wherein the front end of the fixture is provided with an end surface flange, the end surface flange is provided with a seal groove, the seal groove is internally provided with the static seal ring, a set of movable cores are connected with the cylinder, and can coaxially and synchronically do stretching movement along with the cylinder, the movable seal ring on the movable cores is respectively and simultaneously blocked tightly or loosened in a tube bundle hole on the surface of an evaporator, the end surface flange and the rear end of the fixture are flexibly connected through a bellows, by adopting the negative pressure generated by vacuumizing, the static seal ring is pressed by the atmospheric pressure, the static seal ring and the seal groove adopt the curve shapes according to the welding line arrangement of the seal welding on the tube plate surface and crater conditions of the surface of the tube plate, and the movable seal ring adopts a spindle shape. The fixture can simultaneously detect welding quality of welding lines of the seal welding on the surfaces of a plurality of tube plate by electropneumatic control of an electronic control box to the cylinder and a leakage detector.

Description

The helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator

Technical field

The utility model relates to and a kind of the evaporator pipe sheet pad is carried out the multicore anchor clamps rapidly and efficiently, electro-pneumatic that helium mass spectrum leak detection is used, and relates to the mechanical hook-up field.

Background technology

Nuclear power evaporator is the key equipment of nuclear power station, and its agent structure is made up of parts such as shell A, tube sheet B, tube bank C.A plurality of tube banks hole D is arranged on the tube sheet B surface, and many tube bank C in the shell A and the tube bank hole D on tube sheet B surface are by being welded to connect, and this technology is called tube bank-tube sheet and seals weldering, and weld seam is called and seals welding line E.(referring to shown in Figure 1), this welding quality of sealing weldering is most important for the safe operation of nuclear power station, and the welding line that seals between evaporator tube plates and the tube bank has more than 9000 to 20,000, and tube sheet model difference, number is also different, and each weld seam all must carry out helium mass spectrum leak detection.Helium mass spectrum leak detection, be to do tracer gas with helium, side (enclosure) at weld seam charges into the mixing helium, opposite side (tube sheet surface) at weld seam forms partially sealed vacuum cavity, and this vacuum chamber is sealed in tested weld seam wherein, and links to each other with helium mass spectrometer leak detector, if sealed weld seam has leakage, then helium is sucked the vacuum chamber of sealing rapidly by weld seam, and leak locator will make an immediate response and output signal, demonstrates the weld seam leak rate then.The helium that this method can detect minute quantity (is low to moderate 1*10 -10Mbar l/s).

Usually, helium leak test work is a loaded down with trivial details job, wastes time and energy.Above-mentioned " forming the vacuum cavity that comprises the sealing of sealing welding line on the tube sheet surface " of mentioning, this just needs 9000 to 20,000 stopples are lived sealing at least.When domestic in the past producer of doing nuclear power evaporator carries out helium leak test to evaporator, all adopt operation manually, be enclosed within on the bolt with the O RunddichtringO, fill in the hole one by one respectively by hand then, screw nut one by one carefully by hand again, hunt leak also will unscrew nut one by one and extract, and so many hole just needed for the 10 individual times that spend several days, efficient is extremely low, and needs to consume more O RunddichtringO at every turn.

How to form the sealed vacuum cavity that comprises weld seam on the tube sheet surface, how to finish the helium leak test work of so many weld seam quickly and efficiently, this just needs to make special-purpose anchor clamps.

Summary of the invention

For overcoming the existing deficiency of above-mentioned background technology, the utility model provides a kind of multicore, electro-pneumatic operation, unit clamp rapidly and efficiently, can carry out helium mass spectrum leak detection to the welding quality of sealing welding line of evaporator pipe sheet quickly and easily.

For achieving the above object, the utility model is achieved by the following technical programs: this helium mass spectrum leak detection fixture, it is by electric-controlled box, cylinder, one group of slide core, the static seal circle, be enclosed within one group of dynamic seal ring on one group of slide core and detect a mouthful formation jig main body, described jig main body is connected with leak locator, leak locator inside is provided with a mechanical pump, described one group of slide core is located at the inside of jig main body, be arranged with a dynamic seal ring on each slide core of described one group of slide core separately, described one group of slide core rear end is connected with a connecting plate, this connecting plate links to each other with the cylinder at jig main body middle part, be provided with the end face flange at the anchor clamps front end, offer seal groove on the end face flange, a static seal circle is housed in the seal groove; Described one group of slide core can be coaxial synchronously with the cylinder stretching motion, make each dynamic seal ring on the slide core simultaneously in the sealing of the tube bank hole of evaporator pipe sheet end face chock off or take off loose blow-by, during the jam-pack sealing, dynamic seal ring is simultaneously compacted, tube bank hole jam-pack sealing simultaneously with the evaporator pipe sheet end face, and utilize and to vacuumize the negative pressure that is produced the static seal circle in the seal groove is compressed the tube sheet surface, make the dynamic seal ring in static seal circle and the tubular stinger beam hole constitute an annular seal space, the tested a plurality of adjacent welding line that seals is sealed wherein, be provided with a through hole in the sealing chamber, this through hole communicates with the detection mouth and is connected with leak locator, after leak locator is opened, utilize mechanical pump that the sealing chamber is vacuumized, if sealed weld seam has leakage, then helium is sucked described annular seal space rapidly by weld seam, and leak locator will make an immediate response and output signal, demonstrates the weld seam leak rate then.

Being connected between described end face flange and the jig main body rear end adopts corrugated tube to be flexible coupling.The seal groove of described static seal circle and placement static seal circle adopts curve shape according to lip-deep layout and the lip-deep crator layout of tube sheet of sealing welding line of tube sheet.Described dynamic seal ring is set to spindle-type.Each slide core front end of described one group of slide core is connected with movable end cap respectively, and dynamic seal ring can be taken off replacing fast from slide core after taking off movable end cap.Described electric-controlled box is arranged on the handle of anchor clamps rear end.

Compared with prior art, the utlity model has following substantive distinguishing features and progress: by the electro-pneumatic control of electric-controlled box, can detect a plurality of welding qualities of sealing welding line in tube sheet surface simultaneously apace to cylinder and leak locator, quick, efficient, time saving and energy saving.

1, place the end face flange of static seal circle and the design of adopting corrugated tube to be flexible coupling that is connected of anchor clamps rear end, utilize the negative pressure that vacuumizes dexterously, compress the static seal circle by atmospheric pressure, it is very laborsaving easy that operation becoming.

2, place the seal groove and the curved shape of static seal circle of static seal circle, avoid the crator projection, make the sealing of static seal circle easier.

3, dynamic seal ring is designed to the bigger spindle-type in centre small in ends, and is not only big than O RunddichtringO surface of contact, and sealing is easy, and same material is durable than O RunddichtringO, cylinder O-ring seal, reuses often, and required air pressure is lower during operation.

4, control enclosure is placed on the handle, makes operation easier, whole anchor clamps one-hand operation.

5, dynamic seal ring can be changed fast from the movable end cap of anchor clamps front end.

Description of drawings

Below in conjunction with illustrating and best case study on implementation is done more clearly to set forth to the utility model.

Fig. 1 is tube bank hole and the synoptic diagram that seals welding line.

Fig. 2 is the unitary construction synoptic diagram of the utility model helium mass spectrum leak detection fixture embodiment one;

Fig. 3 is the scheme of installation of embodiment one slide core.

Fig. 4 is the structural representation of embodiment one dynamic seal ring.

Fig. 5 is the structural representation of embodiment one static seal circle.

Fig. 6 is the unitary construction synoptic diagram of the utility model embodiment two.

Among the figure: 1, electric-controlled box, 2, cylinder, 3, slide core, 4, dynamic seal ring, 5, the static seal circle, 6, detect mouthful, 7, jig main body, 8, connecting plate, 9, movable end cap, 10, end face flange, 11, seal groove, 12, corrugated tube, 13, cylinder button, 14, leak locator start button, 15, the leak locator stop button, 16, handle.

Embodiment

Embodiment one

As Fig. 2-shown in Figure 5, the main body of this helium mass spectrum leak detection fixture by electric-controlled box 1, cylinder 2, one group of slide core 3, static seal circle 5, be enclosed within one group of dynamic seal ring 4 on one group of slide core 3 and detect mouthfuls 6 and form, jig main body 7 links to each other with leak locator, and there is a mechanical pump leak locator inside.Pitch-row and layout according to the evaporator pipe sheet surface weld, this group of slide core 3 can be designed to any slide core numbers such as four, five, six, seven, eight, nine according to number and the layout in tube bank hole, it is example that present embodiment one constitutes one group of slide core 3 with seven cores, it is located at the inside of jig main body 7 and stretches out the chuck side end face, and link to each other with cylinder 2 with a connecting plate 8, can be coaxial synchronously with cylinder 2 stretching motions, respectively be with a dynamic seal ring 4 (being referred to as dynamic seal ring, is the static seal circle for the difference end face) on each slide core 3.Dynamic seal ring 4 adopts the bigger spindle-type (see figure 3) in smaller centre, two ends, the O-ring seal of this shape is big than O RunddichtringO surface of contact, and unit area deformation is little, and compresses than cylinder O-ring seal is easier, required air pressure is less, only needs 3-5 kilogram air pressure to get final product.Each slide core 3 front end also is socketed with movable end cap 9 respectively, and dynamic seal ring 4 can be taken off replacing fast from slide core 3 after taking off movable end cap 9.Front end at jig main body 7 is provided with end face flange 10, offers seal groove 11 on the end face of end face flange 10, and static seal circle 5 is housed in the seal groove 11.Place the seal groove 11 and the static seal circle 5 of static seal circle 5, all adopt curve shape according to lip-deep tested layout and the lip-deep crator situation of tube sheet of sealing welding line of tube sheet, specific design is waviness curve shape (seeing Fig. 1 and Fig. 4), thereby, avoid causing static seal circle 5 to seal fully because of the crator of projection around avoiding the lip-deep crator of tube sheet.

In the present embodiment, the end face flange 10 of placing static seal circle 5 is flexible coupling with the employing corrugated tube 12 that is connected between the rear end of jig main body 7.3 of slide cores need to aim in the detected weld of inserting the tube sheet surface during operation, need not earlier, the direction on vertical tested tube sheet surface firmly compresses static seal circle 5, elasticity reason owing to corrugated tube 12 self, it is bigger that it connects stroke, utilizes extraneous atmospheric pressure that static seal circle 5 is compressed in the time of therefore can vacuumizing in the back.After adopting corrugated tube 12 to be flexible coupling, make static seal and motive seal separate action and no longer include direct correlation, even dynamic seal ring 4 compresses stuck in the tube bank hole, also can compress corrugated tube 12 by atmospheric pressure, utilize the static seal circle 5 on the elastic compression end face flange sealing trough 11 of corrugated tube 12 again, formation pressure transmits, thereby makes static seal circle 5 not be subjected to the restriction of dynamic seal ring 4.So just can vacuumize the negative pressure that this step produces with back leak detection process need by ingenious land productivity, compress static seal circle 5 by atmospheric pressure.Only need during operation one group of slide core in the anchor clamps 3 aimed at and the tubular stinger beam hole in, press the control enclosure button then, pneumatic pinch dynamic seal ring 4 vacuumizes then and get final product, operates becoming very laborsaving easy.

If but do not have corrugated tube 12 to be flexible coupling, then must earlier static seal circle 5 be compressed, because the stroke of static seal circle 5 itself is limited, it is stuck in the tube bank hole so dynamic seal ring 4 compresses the back, static seal circle 5 does not just have the leeway of adjustment at all, can't utilize the atmospheric pressure when vacuumizing to compress static seal circle 5.When corrugated tube 12 useless is flexible coupling, compresses the back at dynamic seal ring 4 and find that static seal circle 5 does not have the situation of good seal often to take place, loosen dynamic seal ring 4 and heavily come, need repeatedly several times sometimes.

Electric-controlled box 1 of the present utility model is arranged on the handle 16 of jig main body 7 rear ends, and making can the one-handed performance anchor clamps, more convenient and practical.Electric-controlled box 1 is made up of three buttons, comprises the cylinder button 13 of the control cylinder 2 on electric-controlled box 1 top, control cylinder 2 stretching motions, the leak locator start button 14 at middle part, the leak locator stop button 15 of bottom.The start and stop of leak locator, vacuumize action, leak locator and detect action and all can finish by leak locator start button 14 or 15 remote controls of leak locator stop button, electric-controlled box 1 also includes one and is used for the display lamp that leak rate set-point state shows.

Principle of work of the present utility model and operation steps are: at first one group of slide core 3 of anchor clamps is aimed at the back and insert in the tube bank hole of evaporator pipe sheet end face, start the cylinder button 13 on the electric-controlled box 1, one group of slide core 3 is coaxial to carry out stretching motion with cylinder 2 synchronously, the one group of dynamic seal ring 4 that is enclosed within on the slide core 3 is loosened simultaneously or compresses.When pushing away before the cylinder 2, slide core 3 is to protracting, and each dynamic seal ring 4 on each slide core 3 is restrained to throw off in hole from each simultaneously and loosened; When cylinder 2 retreated, slide core 3 contracted backward, and each dynamic seal ring 4 on each slide core 3 is restrained the hole chock off at each simultaneously, thereby a plurality of tube banks hole is sealed simultaneously.Then press leak locator start button 14, leak locator work begins to vacuumize, make the curved static seal circles 5 in the seal groove 11 can be by this negative pressure that vacuumizes around avoiding the lip-deep crator of tube sheet, and compress the tube sheet surface, be that static seal circle 5 seals the end face that a plurality of weld seams in tube sheet surface constitute together, like this, dynamic seal ring 4 in static seal circle 5 and the tubular stinger beam hole constitutes the annular seal space of a vacuum, the sealing chamber seals the tested a plurality of adjacent welding line that seals wherein, be provided with a through hole in the sealing chamber, this through hole communicates with detection mouth 6, be connected with leak locator by detecting the clip that is provided with on the mouth 6 again, after leak locator is opened, utilize mechanical pump that the sealing chamber is vacuumized, if sealed weld seam has leakage, then helium is sucked the vacuum chamber of sealing rapidly by weld seam, leak locator will make an immediate response and output signal, demonstrates the weld seam leak rate then.

Embodiment two

As shown in Figure 6, keeping under the constant situation of aforementioned body structure, it is example that present embodiment two constitutes one group of slide core 3 with four-core, it is located at the inside of jig main body 7, and link to each other with cylinder 2 with a connecting plate 8, can be coaxial synchronously with cylinder 2 stretching motions, respectively be with a dynamic seal ring 4 on each slide core 3.Front end at jig main body 7 is provided with end face flange 10, offers seal groove 11 on the end face of end face flange 10, and static seal circle 5 is housed in the seal groove 11.Place the seal groove 11 and the static seal circle 5 of static seal circle 5, all adopt curve shape according to lip-deep tested layout and the lip-deep crator situation of tube sheet of sealing welding line of tube sheet, specific design is the whole curve shape (see figure 5) of tetragonal band arc corner that is, around avoiding the lip-deep crator of tube sheet, avoid causing static seal circle 5 to seal fully because of the crator of projection.

In sum, the utility model is controlled by the electro-pneumatic of 1 pair of cylinder 2 of electric-controlled box and leak locator, can detect the lip-deep a plurality of adjacent welding qualities of sealing welding line of tube sheet fast and efficiently simultaneously, finish the leak detection work of sealing welding line on evaporator pipe sheet surface efficiently.

Claims (6)

1. helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator, it is by electric-controlled box, cylinder, one group of slide core, the static seal circle, be enclosed within one group of dynamic seal ring on one group of slide core and detect a mouthful formation jig main body, described jig main body is connected with a leak locator, leak locator inside is provided with a mechanical pump, it is characterized in that: described one group of slide core is located at the inside of jig main body, be arranged with a dynamic seal ring on each slide core of described one group of slide core separately, described one group of slide core rear end is connected with a connecting plate, this connecting plate links to each other with the cylinder at jig main body middle part, be provided with the end face flange at the anchor clamps front end, offer seal groove on the end face flange, the static seal circle that the tube sheet surface can be compressed is housed in the seal groove; When described one group of slide core coaxial during synchronously with the cylinder stretching motion, each dynamic seal ring on the slide core is respectively simultaneously in the sealing of the tube bank hole of evaporator pipe sheet end face chock off or the blow-by that gets loose, during the jam-pack sealing, one group of dynamic seal ring in static seal circle and the tubular stinger beam hole constitutes one with weld seam sealing annular seal space wherein, be provided with a through hole in the described annular seal space, this through hole communicates with the detection mouth and is connected with leak locator.
2. the helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator according to claim 1 is characterized in that: be connected by corrugated tube between described flange and the jig main body rear end.
3. the helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator according to claim 1 is characterized in that: the seal groove of described static seal circle and placement static seal circle is set to curve shape according to lip-deep layout and the lip-deep crator layout of tube sheet of sealing welding line of tube sheet.
4. the helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator according to claim 1 is characterized in that: described dynamic seal ring is designed to spindle-type.
5. the helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator according to claim 1 is characterized in that: each slide core front end of described one group of slide core is connected with movable end cap respectively.
6. the helium mass spectrum leak detection fixture that is used for tube plate welding seams of evaporator according to claim 1 is characterized in that: described electric-controlled box is arranged on the handle of anchor clamps rear end.
CN2010202450753U 2009-06-26 2010-06-18 Helium mass spectrum leakage detecting fixture for welding line of evaporator tube plate CN201707180U (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN200920059286.5 2009-06-26
CN200920059286 2009-06-26
CN2010202450753U CN201707180U (en) 2009-06-26 2010-06-18 Helium mass spectrum leakage detecting fixture for welding line of evaporator tube plate

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Application Number Priority Date Filing Date Title
CN2010202450753U CN201707180U (en) 2009-06-26 2010-06-18 Helium mass spectrum leakage detecting fixture for welding line of evaporator tube plate

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108801563A (en) * 2018-06-13 2018-11-13 宁波江丰电子材料股份有限公司 Helium leak detection fixture, helium leak detection device and method

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CN102589810A (en) * 2012-02-07 2012-07-18 哈尔滨锅炉厂有限责任公司 Novel testing device and testing method for sealing performance of pipe plate and heat exchange pipe
CN104296945A (en) * 2013-07-15 2015-01-21 珠海格力电器股份有限公司 Evaporator leak detection system and leak detection method
CN105334006B (en) * 2014-08-14 2018-05-04 丹阳市利旺车辆部件有限公司 A kind of leakage detection apparatus for LNG mounted gas cylinder gas-liquid sealing components
CN104568319A (en) * 2015-01-06 2015-04-29 柳州博昌汽车部件有限公司 Airtightness detection fixture for small commercial automobile manipulator cover assembly
CN105466647A (en) * 2015-11-18 2016-04-06 长春轨道客车股份有限公司 Bogie gas tightness detection device and detection method thereof
CN109668692B (en) * 2018-12-29 2020-12-04 南通大力化工设备有限公司 Leakage detection device for welding seam of container
CN109668693B (en) * 2018-12-29 2020-10-30 李静 Vertical pressure vessel leakage detection device
CN110174224A (en) * 2019-04-23 2019-08-27 中国科学院合肥物质科学研究院 Multi-layer compound structure conductor outer layer stainless steel weld joint helium mass spectrum back pressure leak detection method

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JPH0926374A (en) * 1995-07-13 1997-01-28 Ishikawajima Harima Heavy Ind Co Ltd Equipment for pressure test of welded part inside tube
CN201166599Y (en) * 2008-02-26 2008-12-17 上海电气电站设备有限公司 Apparatus for detecting helium leakage of heat exchanger tube sheet weld joint
CN101408466B (en) * 2008-11-08 2010-06-02 宁夏电力科技教育工程院 Method and device for detecting leakage of shell type heat exchanger

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Publication number Priority date Publication date Assignee Title
CN108801563A (en) * 2018-06-13 2018-11-13 宁波江丰电子材料股份有限公司 Helium leak detection fixture, helium leak detection device and method

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CN101886966B (en) 2011-12-28

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Granted publication date: 20110112

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