CN107356377B - A kind of air-tightness detection device and detection method suitable for socket welding type shut-off valve - Google Patents
A kind of air-tightness detection device and detection method suitable for socket welding type shut-off valve Download PDFInfo
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- CN107356377B CN107356377B CN201710631868.5A CN201710631868A CN107356377B CN 107356377 B CN107356377 B CN 107356377B CN 201710631868 A CN201710631868 A CN 201710631868A CN 107356377 B CN107356377 B CN 107356377B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
- G01M3/086—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds for valves
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- General Physics & Mathematics (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Examining Or Testing Airtightness (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of air-tightness detection devices and detection method suitable for socket welding type shut-off valve, belong to valve detection technical field, it includes bracket, piston component and connector, first through hole is arranged in air inlet by corresponding to shut-off valve on bracket and the second through-hole is arranged in the gas outlet of corresponding shut-off valve, and it designs piston component and matches sealing to realize shut-off valve air inlet and air outlet with first through hole, again by opening up third through-hole on piston and opening up on connector the fourth hole that internal diameter is greater than third through-hole, gas differential pressure is generated in the both side ends of piston with this and drives piston motion, then it fast implements to shut-off valve axial lock and sealing.Air-tightness detection device of the invention is also devised with the first gasket and the second gasket to correspond to the sealing for the air inlet and air outlet for realizing shut-off valve, effectively improve the efficiency of air-leakage test, the accuracy that shut-off valve air-leakage test can also be effectively improved reduces the damage of shut-off valve to be detected.
Description
Technical field
The invention belongs to valve detection technical fields, and in particular to a kind of air-leakage test suitable for socket welding type shut-off valve
Device and detection method.
Background technique
With the continuous development of liquefied natural gas (Liquefied Natural Gas, abbreviation LNG) the relevant technologies, LNG's
It will be used wider and wider, the demand of matched shut-off valve is also more and more, also more next to the performance requirement of shut-off valve
It is stringenter, and air-leakage test is to be directly related to shut-off valve to the detection project that must be done in shut-off valve performance testing process
Service life and safety in utilization.
For different application environments, the shut-off valve of use is also different, according to the area in shut-off valve passage flow direction
Not, common shut-off valve can be divided into straight-through stop valve and angle stop valves, wherein straight-through stop valve air inlet end face and outlet
End face is coaxially disposed and air inlet end face is parallel to outlet end face；The air inlet end face of angle stop valves and outlet end face difference axis are arranged
And it is in a certain angle between both ends of the surface.Since straight-through stop valve has in opening-closing process, frictional force is small between sealing surface, wear-resisting,
The features such as Lift is small, and manufacturing process performance is good, in the application of various fields the most extensively.
Having in straight-through stop valve a kind of is socket welding type shut-off valve, and air inlet and air outlet are mostly the light of coaxial arrangement
Mouth, this kind of shut-off valve exist during air-leakage test with the connection of test access greatly difficult and airtight after connection
Property accuracy is also relatively difficult to guarantee.Experimental rig used by the air-leakage test of existing socket welding type shut-off valve is usually to pass through spiral shell
Line screw-down torque provides sealing force, and one side is larger to the accurate sealing difficulty of shut-off valve air inlet and air outlet, another
Its time for consuming during shut-off valve air inlet and air outlet abutting joint of aspect is more, is unfavorable for the shut-off valve to batch
Air-tight test is carried out, and existing socket welding type shut-off valve air-tightness detection device is larger to the abrasion of test piece, causes
Its reduced service life.Above-mentioned existing socket welding type shut-off valve air-tightness detection method greatly affected the inspection of shut-off valve air-tightness
The accuracy of survey reduces the efficiency of shut-off valve air-leakage test, improves air-leakage test cost.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of suitable for socket welding type shut-off valve
Air-tightness detection device and detection method, wherein real by flowing generated draught head in different tube diameters channel using gas
The piston now slided ensures the quick lock in sealing of shut-off valve, and be arranged using design the first gasket and the second gasket come
The sealing of the corresponding air inlet and air outlet for realizing shut-off valve, effectively improves the efficiency of air-leakage test, moreover it is possible to effectively improve
The accuracy of shut-off valve air-leakage test.
To achieve the above object, one aspect of the present invention provides a kind of air-tightness inspection suitable for socket welding type shut-off valve
Survey device, which is characterized in that including bracket, piston component and connector, wherein
Offer the groove for accommodating stop valve body to be detected on the bracket, it is right on the side wall surface of the groove
It answers the air inlet of shut-off valve to offer the first through hole for accommodating piston component, corresponds to shut-off valve in opposite another side wall surface
Gas outlet offer the second through-hole for being connected to the gas outlet, wherein the first through hole be connected to the bracket outer with
The ladder hole of the groove comprising it is located at the lesser one end of internal diameter and the biggish other end of internal diameter on the groove side,
The two intersection forms the ring-shaped step end face for limiting to the piston component；
The piston component include it is axial be accommodated in the first through hole and can be slided with respect to it so that shut-off valve into
Port and gas outlet, which are compacted the piston of sealing and are filled with the piston coaxial set, carries out limiting buffer spring；Wherein, institute
State piston be stepped shaft structure, the smaller one end of outer diameter pass through the lesser one end of the first through hole internal diameter and with end face with it is described
Shut-off valve air inlet is arranged and accommodates to just, the biggish other end of outer diameter is matched with described biggish one end of first through hole internal diameter
Wherein, size both ends intersection forms annular step surface, and the spring pocket is at the smaller one end outer peripheral surface of the piston and both ends point
Do not abutted with the step end face of first through hole step end face and piston, with to axial reciprocating of the piston in first through hole it is mobile into
Row limit or buffering；And the piston shaft offer upwards be connected to its both ends end face third through-hole, can the piston with
The shut-off valve air inlet is connected to the shut-off valve air inlet after compressing sealing；
The connector is fixedly mounted on end of the first through hole far from the groove, should for blocking the first through hole
Connector axially offers the fourth hole that can be used for being connected to the third through-hole and be connected to simultaneously with external air source, and the described 4th
The internal diameter of through-hole is greater than the internal diameter of the third through-hole, and extraneous gas enters first through hole by the fourth hole by this method
Posterior part gas enters shut-off valve air inlet by the third through-hole being connected to, and remaining gas acts on the piston end surface and pushes
Piston axial movement, and then the matching of shut-off valve air inlet and piston end surface is made to seal and end valve air gate and the groove side
The matching in face seals, so as to be used for air-leakage test.
As a further improvement of the present invention, it is opened up on the piston end surface corresponding with shut-off valve inlet port face
Have annular groove and be equipped with for matched with the shut-off valve air inlet sealing the first gasket, and/or with the cut-off
Offered on the corresponding groove end face in valve air gate end face annular groove and be equipped with for the cut-off valve air gate
Match the second gasket of sealing.
As a further improvement of the present invention, second through-hole and first through hole coaxial arrangement or described first
Axially setting or the third through-hole and the fourth hole are coaxially disposed for through-hole and the third through-hole.
As a further improvement of the present invention, the piston and the inner wall of described larger one end of first through hole internal diameter match
Outer peripheral surface on offer annular groove, matched wherein being equipped with for the sealing of the piston outer periphery and the first through hole inner wall
O-ring.
As a further improvement of the present invention, the fitting end, which is additionally provided with, tightens end, and outer diameter is greater than described first
Through-hole outer diameter, and tighten when the connector is connect with first through hole end end face abut first through hole end face with sealing blocking this first
Through-hole.
As a further improvement of the present invention, the end of tightening abutted on the connector with first through hole end face is provided with third
Gasket.
As a further improvement of the present invention, limited block is also set up between piston and connector in the first through hole,
The limited block is used to contact with the larger one end end face of the piston external diameter to limit it away from the end face of connector fourth hole,
And the limited block offers the connection fourth hole and the branch stomata with the angled setting of its axis, for by described the
In the gas distribution to first through hole being passed through in four through-holes.
As a further improvement of the present invention, the bottom portion of groove is also correspondingly arranged on for shut-off valve axially position
Leading truck, the leading truck include the bottom plate contacted with the groove floor and are divided into bottom plate two sides and offer and end
The side plate of the corresponding U-lag of valve air inlet and air outlet outer diameter.
As a further improvement of the present invention, the base surface that the leading truck is contacted with the groove floor, which is equipped with, to be located at
The small boss of quadrangle.
Another aspect of the present invention provides and a kind of utilizes the above-mentioned air-tightness detection device suitable for socket welding type shut-off valve
The method for carrying out air-leakage test, its step are as follows:
S1: spring, piston are sequentially arranged on bracket in first through hole, first connector is correspondingly connected on bracket
Through-hole end；
S2: socket welding type shut-off valve to be detected is corresponded in the groove being placed on bracket, and makes shut-off valve air inlet
With first through hole to just and cut-off valve air gate and the second through-hole to just；
S3: the valve of socket welding type shut-off valve is closed, and the fourth hole on connector is connected to external air source；
S4: being passed through the gas of certain pressure intensity from external air source into the fourth hole of connector, so that piston overpowers spring
Elastic force and to close to groove a Slideslip so that going out the matching sealing of shut-off valve air inlet and piston end surface and shut-off valve
The matching of port and the groove side seals；
S5: being kept for the gas pressure intensity certain time in external air source, the second through-hole be fully connected in water, and observation second is logical
Whether there is bubble to emerge in hole, with this come judge shut-off valve whether gas leakage；
S6: cancelling external air source and ventilate into connector, and piston return, i.e. piston under the recovery elastic force effect of spring release
Matching with shut-off valve air inlet end face seals, and shut-off valve to be detected takes out from groove and completes air-leakage test process.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
(1) air-tightness detection device suitable for socket welding type shut-off valve of the invention, by setting piston come realize to cut
The only axial lock of valve and end face seal are made on connector using the design form to third through-hole and fourth hole different inner diameters
Fourth hole internal diameter be greater than piston on third through-hole internal diameter, with this piston both side ends generate gas differential pressure and drive
Piston motion can not only detect the air-tightness of shut-off valve then to shut-off valve axial lock and sealing using gas is passed through, also
Gas pressure intensity can be efficiently used to realize the sealing of shut-off valve, effectively improve the lasting seals of shut-off valve air-leakage test；
(2) air-tightness detection device suitable for socket welding type shut-off valve of the invention, by using the first gasket and
Two gaskets realize the sealing of socket welding type shut-off valve air inlet and air outlet end face respectively, effectively ensure shut-off valve air-tightness
The accuracy of detection, and then improve the safety in utilization of socket welding type shut-off valve；
(3) air-tightness detection device suitable for socket welding type shut-off valve of the invention, it is only necessary to by leading in external air source
Enter gas or cancel gas be passed through just be able to achieve shut-off valve quick locking seal and release restrict between convert, thus
The fast assembling-disassembling of achievable shut-off valve on detection means effectively improves the air-leakage test efficiency of shut-off valve, reduces and cuts
Only valve air-leakage test cost；
(4) air-tightness detection device suitable for socket welding type shut-off valve of the invention, structure is simple, and design cost is lower,
And easily operated and dismounting, the accuracy of air-leakage test has been effectively ensured, has improved the air-leakage test of socket welding type shut-off valve
Efficiency reduces shut-off valve air-leakage test cost, further reduced the application cost of overhaul of socket welding type shut-off valve.
Detailed description of the invention
Fig. 1 is the overall structure section view of the air-tightness detection device suitable for socket welding type shut-off valve of the embodiment of the present invention
Figure；
Fig. 2 is the stereoscopic schematic diagram in the embodiment of the present invention for the leading truck of socket welding type shut-off valve positioning；
In all the appended drawings, same appended drawing reference indicates identical technical characteristic, specifically: 1. second gaskets, 2.
Leading truck, 3. first gaskets, 4. springs, 5.O type circle, 6. pistons, 7. brackets, 8. connectors, 9. third gaskets, JZF. insert weldering
Formula shut-off valve.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Constituting conflict can be combined with each other.
Fig. 1 is the overall structure section view of the air-tightness detection device suitable for socket welding type shut-off valve of the embodiment of the present invention
Figure；Fig. 2 be in the embodiment of the present invention for socket welding type shut-off valve positioning leading truck stereoscopic schematic diagram, including bracket 7,
Leading truck 2, piston 6 and connector 8.
Further, as shown in fig. 1, bracket 7 is the master of air-tightness detection device to the bracket 7 in a preferred embodiment
Body component, for being accommodated the inlet port of shut-off valve and outlet port wherein and realizing its end part seal.Specifically, at one
Bracket 7 in preferred embodiment is rectangular shape, and the rectangular blind hole of certain depth is offered on one side end face as accommodating
The groove of shut-off valve to be detected corresponds to the inlet port of shut-off valve on the two sides inner wall of groove and outlet port coaxially offers
One through-hole and the second through-hole, further, the second through-hole correspond to the position setting that shut-off valve is accommodated in gas outlet in groove, one
Side is connected to the exterior space of bracket 7, and the other side is connected to the groove on bracket 7, and the internal diameter of the second through-hole is preferably smaller than shut-off valve
Gas outlet internal diameter and preferably with the gas outlet of shut-off valve be coaxially disposed；First through hole is stepped hole, corresponds to shut-off valve and is accommodated in
The position setting of air inlet, is preferably coaxially disposed with the air inlet of shut-off valve in groove, and the side of first through hole is connected to bracket 7
On groove, the other side be connected to bracket 7 outside；Further, first through hole is in the smaller back of internal diameter close to groove side
Side internal diameter from groove is larger, preferably cylindrical cavity, the intersection in the smaller one end of internal diameter and the larger one end of internal diameter
Form ring-shaped step end face.
Further, being equipped in first through hole can be with respect to first through hole piston 6 in axial sliding, piston 6 corresponding first
Via design is stepped shaft structure, and one end outer diameter is matched with the smaller one end of first through hole internal diameter to pass through first for piston 6
Through-hole and with end face contact sealed stop valve air inlet end face, other end outer diameter matched with the larger one end of first through hole internal diameter with
Sealing is contacted with first through hole for piston 6 and can make axially opposing sliding with respect to first through hole under external force, on piston 6
The smaller one end of outer diameter and the larger one end of outer diameter between intersection formed annular step surface, i.e., piston 6 one be preferably implemented
It is in rotary T-shaped structure in example, further, the third through-hole of connection both sides of the face, third through-hole is axially offered on piston 6
It is preferred that coaxially opened up with first through hole and/or shut-off valve air inlet, third through-hole by the air inlet of shut-off valve and 6 internal diameter of piston compared with
The space of big end side is connected to；It is further preferred that the internal diameter that is contacted with the larger one end internal perisporium of first through hole internal diameter of piston 6 compared with
Offer annular groove on big one end periphery wall, ensure for O-ring 5 to be arranged in annular groove the periphery wall of piston 6 with
Gas leak phenomenon does not occur between the internal perisporium of first through hole, on the sliding end periphery wall on piston 6 in a preferred embodiment
It is opened up in parallel there are two annular groove, there are two cyclic annular O-rings 5 for accommodating；Further, it is also arranged on the sealed end of piston 6
Spring 4, a side end face of spring 4 are contacted with the ring-shaped step end face of first through hole, the annular on another side end face and piston 6
The setting of step face contact, spring 4 are in compressive state in air-tightness detection device working condition, and piston 6 is toward groove direction at this time
The position with shut-off valve air inlet tight fit is slided into, spring 4 is in air-tightness detection device off working state by its recovery
Piston 6 is pushed to the position far from groove by elastic force.
Further, first through hole is additionally provided with connector 8 far from a side end of groove, and the both ends of connector 8 are provided with company
Connector is respectively used to connect with first through hole on bracket 7 and connect with external air source, it is further preferred that connector 8 and first
The form connection that the end internal perisporium of through-hole is threadedly coupled, i.e., first through hole outlet end offers internal screw thread, correspondingly, connector
8 match with the internal diameter of the larger one end of the internal diameter of the outer diameter of first through hole connecting pin and first through hole and corresponding offer outer spiral shell
Line further axially offers the fourth hole of penetrator 8 between 8 both ends connector of connector, on connector 8 and bracket 7
After first through hole matching connection, first through hole is connected to by fourth hole with the exterior space of connector 8, further, fourth hole
Internal diameter be greater than third through-hole internal diameter, i.e., on connector 8 fourth hole cross section of fluid channel product be greater than piston 6 on third through-hole stream
The internal diameter difference of road sectional area, third through-hole and fourth hole to be continually fed into fourth hole certain pressure intensity gas it
Afterwards, be detained between piston 6 and connector 8 have bulk gas to form draught head so that piston 6 overcomes the elastic force of spring 4 and to
Groove direction is slided to match sealing with the air inlet end face of shut-off valve；
It is further preferred that connector 8 may be designed as three-stage Step Shaft form, the preferred coaxial design of three stage structure,
In, be the lesser connecting pin of outer diameter positioned at two sections of 8 both ends of connector, the bracket connecting pin respectively being connect with first through hole and
End, further specifically, bracket are tightened for outer diameter is biggish between two sections of connecting pins in the piping connection end connecting with external air source
The outer diameter of connecting pin matches setting with the internal diameter of first through hole, forms annular step surface, annular table with the intersection for tightening end
Terrace, which contacts after connector 8 and the matching connection of bracket 7 with the bracket end face of first through hole side, to be arranged to guarantee connector 8 and bracket
7 matching after by first through hole end part seal, can tighten end setting be for ease of operation personnel easily by connector 8 connect and/
Or remove bracket 7, tighten end the other side piping connection end for external air source connection, outer diameter preferably with the company of external air source
Both offer with the matched external screw thread of external air source connector internal diameter to realize in the matching of connector internal diameter and pipe joint
Fast thread connection；It is further preferred that being provided with limited block in the end of the bracket connecting pin of connector 8, limited block plays limit
Position and the effect shunted, specifically, piston 6 pushes and slide into a quiescent state the position of limited block contact by spring 4
It sets, is sealed the third through-hole on piston 6 by limited block end face, limited block is preferably coaxially disposed with connector 8 and width is greater than the
The internal diameter and width of four through-holes are less than the internal diameter of first through hole, offer the branch that axis intersects with fourth hole axis on limited block
Vent hole, branch stomata are connected to fourth hole for being divided into the gas passed through in fourth hole with former flow direction in certain angle
The space between connector 8 and piston 6 is flowed into again after spending the flow direction of deflection, and reaching to the air pressure in above-mentioned space can overcome
After the elastic force of spring 4, piston 6 is pushed from air pressure to the direction close to groove and matched with the air inlet of shut-off valve in groove close
Envelope.
Further, the second through-hole internal diameter of corresponding cut-off valve air gate is preferably no greater than the internal diameter for ending valve air gate,
And corresponding shut-off valve gas outlet endface position offers annular groove, annular groove and cut-off valve air gate on the side of groove
It is coaxially disposed, and the outlet tube wall thickness setting for opening up width and preferably corresponding to shut-off valve of annular groove, is set in annular groove
It is equipped with the second gasket 1 for matching sealing with shut-off valve gas outlet end face, the second gasket 1 and gas outlet end face seal
Thickness after matching is preferably more than the depth of annular groove, it is further preferred that matching the piston 6 contacted with shut-off valve air inlet
The end face outer diameter of the smaller one end of outer diameter is preferably greater than the outer diameter of shut-off valve air inlet, and piston 6 is corresponding with shut-off valve inlet port face
End face on also correspond to the annular groove that shut-off valve air inlet end face offers the first gasket 3 of accommodating, the first gasket 3 connecing
Sealing is matched with shut-off valve air inlet end face after being passed through continued compression gas in first 8, and matches the first gasket 3 after sealing
Thickness is preferably more than the depth of corresponding annular groove；It is further preferred that being set between the end face that connector 8 is contacted with bracket 7
It is equipped with third gasket 9, third gasket 9 is preferably set on the bracket connecting pin of connector 8, i.e. one side end face and connector
8 upper bracket connecting pins and the ring-shaped step face contact that is formed between end is tightened, another side end face is in the matching of connector 8 connection upper first
It is contacted after through-hole with one side end face, to ensure that the connection between connector 8 and bracket 7 seals.
It is further preferred that the bottom of groove is provided with the leading truck 2 to match with groove floor shape, leading truck 2 is used
In socket welding type shut-off valve is put into wherein and to air inlet and air outlet carry out axially position and prevent shut-off valve in groove before
After swing, further, leading truck 2 by the bottom plate that is contacted with groove floor and be set to bottom plate two sides and corresponding shut-off valve into
Port and the both side plate of gas outlet composition, both side plate is preferably arranged in parallel, and coaxially offered on both side plate for shut-off valve into
Port end and outlet port correspondence prevent the U-lag for wherein and realizing axially position, and the U-lag on both side plate is preferably semicircle
The width of fluting, fluting corresponds to the outer diameter of shut-off valve air inlet and/or gas outlet, and shut-off valve is made to be put into guiding
After in frame 2, air inlet end face on both side plate U-lag can be just with the first gasket 3 on piston 6 to just and gas outlet
It end face can be just with the second gasket 1 to just；It is further preferred that driving shut-off valve in bottom portion of groove to reduce leading truck 2
Along disengaging gas axis direction on force of sliding friction, be provided with small boss on the bottom plate quadrangle of leading truck 2, with small boss with it is recessed
The bottom surface of slot contacts, to reduce the force of sliding friction of leading truck 2.
Before the air-tightness detection device work suitable for socket welding type shut-off valve in one preferred embodiment, by spring 4, peace
Piston 6 equipped with O-ring 5 and the first gasket 3 is sequentially arranged in 7 first through hole of bracket, and is set in the matching connection of its end
It is equipped with the connector 8 of third gasket 9, the bottom portion of groove then socket welding type shut-off valve as shown in Figure 1 being placed on the bracket 7
Leading truck 2 on, i.e. the air inlet and air outlet of shut-off valve are accommodated in the U-lag on 2 both side plate of leading truck, at this point, cut-off
The first gasket 3 is being to just on the air inlet of valve and 6 one side end face of piston, and second on the gas outlet of shut-off valve and groove side
Gasket 1 is to just；The valve of shut-off valve is closed, external air source is connected with the piping connection end of connector 8, and from external air source toward connecing
Be continually fed into the compressed gas of certain pressure intensity in first 8, push piston 6 to overcome the elastic force of spring 4 and to one Slideslip of groove so that
The air inlet end face of shut-off valve is in close contact to match sealing, and the gas outlet end face and second of shut-off valve with the first gasket 3
Gasket 1 is in close contact to match sealing, is kept for the gas pressure intensity certain time in external air source, and by above-mentioned with to be detected
The bracket 7 of shut-off valve is immersed in water or in the second through-hole is not connected with rubber tube after the side of groove access rubber tube
One end is immersed in water, and whether observe in the second through-hole has bubble to emerge, and detects whether shut-off valve has the case where gas leakage with this,
After detection, bracket 7 is taken out from water, closes the gas input in external air source, piston 6 is extensive due to spring 4 at this time
Multiple elastic force and locked by being pushed with the sealing for contacting to shut-off valve air inlet and/or gas outlet, take out the shut-off valve that detection finishes
The air-leakage test process of test specimen completion socket welding type shut-off valve.
It carries out inserting weldering suitable for socket welding type shut-off valve air-tightness detection device with above-mentioned in a preferred embodiment
The step of formula shut-off valve air-leakage test, is as follows:
S1: spring 4, the piston 6 for being equipped with O-ring 5 and the first gasket 3 are sequentially arranged at first through hole on bracket 7
In, the bracket connecting pin of connector 8 is correspondingly connected on bracket 7；
S2: by the corresponding bottom for being placed in groove of leading truck 2, and socket welding type shut-off valve to be detected is corresponded into leading truck 2
U-lag on both side plate and shut-off valve is placed in leading truck 2 so that shut-off valve air inlet and the first gasket 3 to just and
End valve air gate and the second gasket 1 to just；
S3: the valve of socket welding type shut-off valve is closed, and the external air source of certain pressure intensity gas will be can provide with collar nut
Matching connection is carried out with the piping connection end of 8 side of connector；
S4: being passed through the gas of certain pressure intensity by external air source into connector 8, with the compressed gas between piston 6 and connector 8
Body pressure overcomes the elastic force of spring 4 and makes piston 6 to one Slideslip of groove so that the first gasket 3 and shut-off valve air inlet
End face matches sealing and the second gasket 1 matches sealing with shut-off valve gas outlet end face；
S5: being kept for the gas pressure intensity certain time in external air source, bracket 7 be immersed in water, observes the on bracket 7
Whether there is bubble to emerge in two through-holes, with this come judge shut-off valve whether gas leakage；
S6: cancelling external air source and ventilate into connector 8, piston 6 return, i.e. piston 6 under the recovery elastic force effect of spring 4
The close contact with shut-off valve air inlet end face is released, shut-off valve to be detected can take out from groove and complete air-leakage test mistake
Journey；
S7: circulation step S1~S6, complete the air-leakage test of batch socket welding type shut-off valve.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of air-tightness detection device suitable for socket welding type shut-off valve, which is characterized in that including bracket (7), piston component
With connector (8), wherein
Offer the groove for accommodating stop valve body to be detected on the bracket (7), it is right on the side wall surface of the groove
It answers the air inlet of shut-off valve to offer the first through hole for accommodating piston component, corresponds to shut-off valve in opposite another side wall surface
Gas outlet offer the second through-hole for being connected to the gas outlet, wherein the first through hole is that be connected to the bracket (7) external
With the ladder hole of the groove comprising it is biggish another to be located at the lesser one end of internal diameter and internal diameter on the groove side
End, the two intersection form the ring-shaped step end face for limiting to the piston component；
The piston component includes axially being accommodated in the first through hole and can sliding with respect to it so that shut-off valve air inlet
The piston (6) of sealing is compacted with gas outlet and the spring (4) of limiting buffer is carried out with the piston (6) coaxial package；
Wherein, the piston (6) be stepped shaft structure, the smaller one end of outer diameter pass through the lesser one end of the first through hole internal diameter and with
To just, the biggish other end of outer diameter is matched with described biggish one end of first through hole internal diameter for end face and the shut-off valve air inlet
It is arranged and accommodates wherein, size both ends intersection forms annular step surface, and the spring (4) covers smaller by one in the piston (6)
It holds outer peripheral surface and both ends is abutted with the step end face of first through hole step end face and the piston (6) respectively, to the piston
(6) the axial reciprocating movement in first through hole is limited or is buffered；And offered in piston (6) axial direction connection its two
The third through-hole of end face is held, the shut-off valve can be connected to after the piston (6) compresses sealing with the shut-off valve air inlet
Air inlet；
The connector (8) is fixedly mounted on end of the first through hole far from the groove, and for blocking the first through hole, this is connect
Head (8) axially offer can be used for being connected to the third through-hole and while the fourth hole that is connected to external air source, and described the
The internal diameter of four through-holes is greater than the internal diameter of the third through-hole, and extraneous gas enters first by the fourth hole and leads to by this method
Hole posterior part gas enters shut-off valve air inlet by the third through-hole being connected to, and remaining gas acts on the piston (6) end
Face pushes piston (6) axial movement, and then makes the matching of shut-off valve air inlet and the piston (6) end face sealing and cut-off
The matching of valve air gate and the groove side seals, so as to be used for air-leakage test.
2. the air-tightness detection device according to claim 1 suitable for socket welding type shut-off valve, wherein with the shut-off valve
Offered on corresponding piston (6) end face in inlet port face annular groove and be equipped with for the shut-off valve air inlet
The first gasket (3) of sealing is matched, and/or is offered on the groove end face corresponding with shut-off valve outlet port face
Annular groove is simultaneously equipped with for matching the second gasket (1) sealed with the cut-off valve air gate.
3. the air-tightness detection device according to claim 2 suitable for socket welding type shut-off valve, wherein second through-hole
With first through hole coaxial arrangement or the first through hole and the third through-hole axially setting or the third through-hole with
The fourth hole coaxial arrangement.
4. the air-tightness detection device described in any one of claim 1 to 3 suitable for socket welding type shut-off valve, wherein
Annular groove is offered on the outer peripheral surface that the inner wall of the piston (6) and described larger one end of first through hole internal diameter matches,
In be equipped with and seal matched O-ring (5) for the piston (6) periphery and the first through hole inner wall.
5. the air-tightness detection device described in any one of claim 1 to 3 suitable for socket welding type shut-off valve, wherein
Connector (8) end, which is additionally provided with, tightens end, outer diameter be greater than the first through hole internal diameter, and the connector (8) with it is described
First through hole tightens end end face and abuts the first through hole end face with the sealing blocking first through hole when connecting.
6. the air-tightness detection device according to claim 5 suitable for socket welding type shut-off valve, wherein the connector (8)
The upper end of tightening abutted with the first through hole end face is provided with third gasket (9).
7. the air-tightness detection device described in any one of claim 1 to 3 suitable for socket welding type shut-off valve, wherein
Limited block is also set up in the first through hole between the piston (6) and the connector (8), the limited block is away from described
The end face of connector (8) fourth hole is for contacting with the larger one end end face of the piston (6) outer diameter to limit to it, and the limit
Position block offers the connection fourth hole and the branch stomata with the angled setting of its axis, with for will be in the fourth hole
In the gas distribution to first through hole being passed through.
8. the air-tightness detection device described in any one of claim 1 to 3 suitable for socket welding type shut-off valve, wherein
The bottom portion of groove is also correspondingly arranged on for the leading truck (2) to shut-off valve axially position, and the leading truck (2) includes and institute
It states the bottom plate of groove floor contact and is divided into bottom plate two sides and offers opposite with shut-off valve air inlet and air outlet outer diameter
Answer the side plate of U-lag.
9. the air-tightness detection device according to claim 8 suitable for socket welding type shut-off valve, wherein the leading truck
(2) base surface contacted with the groove floor is equipped with the small boss positioned at quadrangle.
10. it is a kind of using described in any one of claim 1~9 be suitable for socket welding type shut-off valve air-tightness detection device come into
The method of row socket welding type shut-off valve air-leakage test, its step are as follows:
S1: spring (4), piston (6) are sequentially arranged on bracket in first through hole, connector is correspondingly connected on bracket (7)
First through hole end；
S2: by the corresponding groove being placed on bracket (7) of socket welding type shut-off valve to be detected, and make shut-off valve air inlet with
First through hole to just and cut-off valve air gate and the second through-hole to just；
S3: the valve of socket welding type shut-off valve is closed, and the fourth hole on connector (8) is connected to external air source；
S4: being passed through the gas of certain pressure intensity from external air source into the fourth hole of connector (8), so that piston (6) overcomes spring
(4) elastic force and to the Slideslip close to groove so that make the matching of shut-off valve air inlet and piston (6) end face sealing and
The matching for ending valve air gate and the groove side seals；
S5: being kept for the gas pressure intensity certain time in external air source, the second through-hole be fully connected in water, is observed in the second through-hole
Whether there is bubble to emerge, with this come judge shut-off valve whether gas leakage；
S6: cancelling external air source and ventilate into connector, and piston (6) return, i.e. piston (6) under the recovery elastic force effect of spring solve
Except sealing with the matching of shut-off valve air inlet end face, shut-off valve to be detected takes out from groove and completes air-leakage test process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631868.5A CN107356377B (en) | 2017-07-28 | 2017-07-28 | A kind of air-tightness detection device and detection method suitable for socket welding type shut-off valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631868.5A CN107356377B (en) | 2017-07-28 | 2017-07-28 | A kind of air-tightness detection device and detection method suitable for socket welding type shut-off valve |
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| CN107356377A CN107356377A (en) | 2017-11-17 |
| CN107356377B true CN107356377B (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710631868.5A Active CN107356377B (en) | 2017-07-28 | 2017-07-28 | A kind of air-tightness detection device and detection method suitable for socket welding type shut-off valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113199715B (en) * | 2021-03-25 | 2022-06-28 | 佛山市顺德区鸡洲德兴塑料制品有限公司 | Leakage early warning type cooling system for injection mold |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064939A (en) * | 1991-03-14 | 1992-09-30 | 德雷塞工业有限公司 | Be used to detect the method and apparatus of the reduction valve set pressure of operation valve control |
| CN2366843Y (en) * | 1999-04-14 | 2000-03-01 | 扬州奥力威传感器有限公司 | Device for stopping leakage for investigating fluid-tightness |
| CN105115672A (en) * | 2015-10-16 | 2015-12-02 | 江南工业集团有限公司 | Detection device and method for low-temperature stop valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006220138A (en) * | 2005-01-12 | 2006-08-24 | Denso Corp | Vaporized fuel leakage inspection system |
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2017
- 2017-07-28 CN CN201710631868.5A patent/CN107356377B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064939A (en) * | 1991-03-14 | 1992-09-30 | 德雷塞工业有限公司 | Be used to detect the method and apparatus of the reduction valve set pressure of operation valve control |
| CN2366843Y (en) * | 1999-04-14 | 2000-03-01 | 扬州奥力威传感器有限公司 | Device for stopping leakage for investigating fluid-tightness |
| CN105115672A (en) * | 2015-10-16 | 2015-12-02 | 江南工业集团有限公司 | Detection device and method for low-temperature stop valve |
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