CN113252248A - Leak detection device and using method thereof - Google Patents
Leak detection device and using method thereof Download PDFInfo
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- CN113252248A CN113252248A CN202110521060.8A CN202110521060A CN113252248A CN 113252248 A CN113252248 A CN 113252248A CN 202110521060 A CN202110521060 A CN 202110521060A CN 113252248 A CN113252248 A CN 113252248A
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- 238000007789 sealing Methods 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims abstract description 31
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Classifications
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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
- G01M3/10—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 containers, e.g. radiators
- G01M3/106—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 containers, e.g. radiators for radiators
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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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3227—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators for radiators
Abstract
The invention relates to a leak detection device and a using method thereof. The leak detection device includes: the upper pressing part is configured to tightly press the upper preformed hole at the upper preformed hole of the device to be leaked in a sealing mode, and comprises an air channel which is communicated with the upper preformed hole; and the pressing part is configured to tightly press the lower reserved hole at the lower reserved hole of the device to be detected. The invention adopts the axial compression sealing mode for leak detection, has low requirement on the deviation of the aperture, large adjustable range of the size in the compression axial direction, stronger universality and convenient operation in use, eliminates the adverse effect generated by secondary welding, can realize larger compression force in the axial direction and can achieve higher level of sealing.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a PCHE microchannel heat exchanger leak detection device and a using method thereof.
Background
PCHE microchannel heat exchangers (printed circuit board heat exchangers) are typically composed of edge plates, etched plates. The heat exchanger includes two sets of passageways or multiunit channel structure, and the most main part is the heat transfer core, because diffusion welding or vacuum brazing's technological characteristic, general product is the planar structure of upper and lower face, and its welding back needs to carry out preliminary gas tightness leak testing, just gets into subsequent processing procedure after waiting to confirm that the product welding is qualified. The structure after the heat exchanger product core welding is as shown in figure 1, and four preformed holes are left on the upper surface and the lower surface respectively to connect the leak detection interface, wherein one side is two channel inlets: a first channel inlet a1 and a second channel inlet B1, with two channel outlets on the other side: the first channel outlet A2 and the second channel outlet B2 are respectively used for connecting two chambers inside the core body with two gas input pipelines so as to detect the air tightness of the core body.
Generally, when a product core is subjected to high-pressure (air pressure is greater than or equal to 4 MPa) pre-leak detection or air tightness leak detection, a welding joint is often used for connection, and as shown in fig. 2, the leak detection process operation of a welding joint C is generally adopted as follows: use customization screwed joint, weld it respectively in product chamber way surface reservation hole site department, later one side screwed joint connects the pipe that admits air, and behind the manometer was connected to the opposite side, with the whole water inlet that soaks of product, fill in the product cavity gas, whether appear leaking through visual observation product on have bubble to emerge and the manometer has or not pressure to descend and judge the product. The scheme has low requirement on the product structure and high pressure bearing capacity, but the welding joint needs to be cut when being removed, and the produced residues can pollute the interior of the product; no matter methods such as adopting flame borer, argon arc welding or two guarantor welding when connecting the welding, all can change the metallographic structure of welding position metal because the existence of welding heat induction zone, the recessive bad condition of product takes place when the structural component (such as erection joint part such as connecting pipe or screw thread) of product is welded at this position again, if: reduced weld bead strength, brittle weld bead cracking, reduced weld bead impact resistance, and the like. In addition, the welding of the joint needs professional welders and welding equipment, the operation is inconvenient, and the welding joint part for leak detection can be used only once, so that the use cost-effectiveness ratio is low.
Therefore, a new leak detection technical solution for the heat exchanger is needed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention aims to provide a leak detection apparatus and a method for using the same, so as to be capable of performing a gas tightness detection on a device waiting for leak detection, such as a PCHE microchannel heat exchanger, quickly and conveniently, without affecting the device itself to be detected.
The invention firstly proposes a leak detection device, said device comprising:
the upper pressing part is configured to tightly press the upper preformed hole at the upper preformed hole of the device to be leaked in a sealing mode, and comprises an air channel which is communicated with the upper preformed hole;
a pressing portion configured to apply upward pressure to the device to be leaked;
a connecting portion connecting the pressing-up portion and the pressing-down portion.
According to an embodiment of the present invention, the pressing portion includes a fastening portion and a pressing portion configured to be movable up and down relative to the fastening portion and lockable, and the gas passage is provided in the pressing portion.
According to an embodiment of the present invention, the pressing portion includes a vent block portion and a deviation correcting portion, the vent block portion is configured to be connected to the upper preformed hole in a sealing manner, the vent block portion is provided with the gas channel, the deviation correcting portion is connected to the vent block portion in a ball hinge manner, and the deviation correcting portion is movably connected to the fastening portion.
According to an embodiment of the present invention, the vent plug includes a plug fitting into the upper prepared hole, the gas passage is provided in the plug, and preferably, the vent plug further includes a threaded joint connecting the gas passage.
According to one embodiment of the invention, the deviation correcting part comprises a compression screw, the bottom end of the compression screw comprises a ball head connecting part, the upper end of the ventilation block part comprises a spherical connecting hole, and the spherical connecting hole is matched with the ball head connecting part; the circumferential surface of the compression screw includes a screw coupling portion to be screw-coupled with the fastening portion.
According to an embodiment of the present invention, the deviation rectifying portion further includes a force applying portion to apply a downward pressure to the vent intercepting portion; the ventilation blocking part also comprises a stopping part for stopping the ball head connecting part of the compression screw from coming off; preferably, the stopping part comprises a group of pin shafts, the compression screw comprises a groove arranged along the circumferential direction, the groove is located above the ball head connecting part, and the group of pin shafts penetrate into the ventilating blocking part and are located at the position of the groove.
According to an embodiment of the present invention, the fastening portion includes an upper base and a slide configured to be slidable in a horizontal direction with respect to the upper base, the slide being connected to the pressing portion, and preferably, the upper base is provided with a guide portion along which the pressing portion is configured to move in the horizontal direction; more preferably, the guide portion is a slide groove through which the depressed portion passes.
According to one embodiment of the invention, the pressing part is configured to seal and press the lower preformed hole at the lower preformed hole of the device to be leaked; preferably, the upper pressing part and the lower pressing part are respectively connected with the connecting part at adjustable positions; preferably, the pressing part and the pressing part are aligned along an axial central axis in an operating state; preferably, the pressing portion comprises a sealing plug.
The invention also provides a method for detecting leakage by using the leakage detecting device, which comprises the following steps:
the upper preformed hole is tightly pressed at the upper preformed hole of the equipment to be detected by the upper pressing part;
and inputting detection gas through a gas channel of the upper pressure part, and checking whether the device to be detected leaks gas or not.
According to an embodiment of the invention, the method further comprises: the axial direction of the pressing part is adjusted to enable the leak detection device to reach the required sealing grade; and the lower preformed hole is tightly sealed at the lower preformed hole of the device to be detected through the pressing part.
The invention adopts the axial compression sealing mode for leak detection, has low requirement on the deviation of the aperture, large adjustable range of the size in the compression axial direction, stronger universality and convenient operation in use, eliminates the adverse effect generated by secondary welding, can realize larger compression force in the axial direction and can achieve higher level of sealing.
Drawings
FIG. 1 is a schematic diagram of a heat exchanger product core construction;
FIG. 2 is a schematic view of a conventional heat exchanger core weld joint structure;
FIG. 3 is a schematic structural view of a movable leak detection tool clamp according to an embodiment of the invention;
FIG. 4 is a schematic diagram of the overall structure of a leak detection apparatus according to an embodiment of the invention;
FIG. 5 is a schematic view of a half-section of an upper pressing device according to an embodiment of the present invention;
FIG. 6 is a schematic view of a half-section of a lower compression device according to an embodiment of the present invention;
reference numerals:
a1, a first channel inlet, a B1 second channel inlet, A2, a first channel outlet, B2, a second channel outlet, C, a welded joint, D, a leak detection device, 1, a lower base, 2, a screw, 3, a support rod, 4, an upper base, a 401 sliding groove, 5, a sealing plug, 6, an O-shaped ring, 7, a threaded joint, 8, a ventilation plug, 801, a spherical connecting hole, 9, a sliding seat, 91, a lower end, a 901 clamping groove, 902, a sliding seat threaded hole, 10, a compression screw, 101, a ball head connecting part, 102 grooves, 11, a rotating handle, 12 gas channels, 13, a pin shaft, 14, a fixing screw, 15, a base limiting groove, 16 and a plug boss.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
The invention firstly proposes a leak detection device D, said device comprising:
the upper pressing part is configured to tightly press the upper preformed hole at the upper preformed hole of the device to be leaked in a sealing mode, and comprises an air channel which is communicated with the upper preformed hole;
a pressing portion configured to apply upward pressure to the device to be leaked;
a connecting portion connecting the pressing-up portion and the pressing-down portion.
The invention adopts the way of compressing and sealing up and down axially to connect the equipment to be detected with leakage detection, has low requirement on the deviation of the aperture, large adjustable range of the size in the compressing axial direction, stronger universality and convenient operation in use, eliminates the adverse effect generated by secondary welding, can realize larger pressing force in the axial direction and can achieve higher level of sealing.
According to an embodiment of the present invention, the pressing portion includes a fastening portion and a pressing portion configured to be movable up and down relative to the fastening portion and to be locked, and the gas passage is provided in the pressing portion. The gas channel is used for inputting detection gas to realize the function of leak detection.
According to an embodiment of the invention, the pressing part comprises a ventilation blocking part and a deviation correcting part, the ventilation blocking part is configured to be connected with the upper reserved hole in a sealing mode, the ventilation blocking part is provided with the gas channel, the deviation correcting part is connected with the ventilation blocking part in a spherical hinge mode, and the deviation correcting part is movably connected with the fastening part. The mode that the ball pivot is connected for the upper pressure part can link up with the surface of examining the check out test set better when pushing down, is convenient for guarantee the leakproofness.
According to an embodiment of the present invention, the ventilation blocking portion includes a plug, as shown in fig. 4, which is specifically a ventilation plug 8, which is matched with the upper preformed hole, a column body of the plug is just screwed into the upper preformed hole, and a sealing ring such as an O-ring can be added around the periphery of the ventilation plug for sealing connection. The ventilation plug 8 is provided with a gas channel 12.
Preferably, the vent block further comprises a threaded joint 7, which connects the gas channel 12. The threaded joint 7 may be a threaded joint for air intake or air exhaust. The nipple 7 can be connected to a gas channel 12 laterally of the venting plug 8, and the gas channel 12 can be designed as a bent channel.
According to one embodiment of the present invention, as shown in fig. 4 and 5, the deviation rectifying portion includes a compression screw 10, the bottom end of the compression screw 10 includes a ball head connecting portion 101, and the upper end of the ventilation blocking portion includes a spherical connecting hole 801, and the spherical connecting hole 801 is matched with the ball head connecting portion 101. The circumferential surface of the compression screw 10 includes a screw coupling portion to be screw-coupled with the fastening portion.
According to an embodiment of the present invention, the rectifying portion further includes a force applying portion, such as a rotating handle 11 shown in fig. 4, to apply a downward pressure to the air vent intercepting portion.
The vent block may further include a stopper portion to stop the ball joint portion 101 of the compression screw 10 from coming out.
The stopping part can be a locking structure or a plugging structure so as to be separated from the vertical deviation-rectifying part.
Preferably, the stopping part comprises a set of pins 13, the compression screw 10 comprises a groove 102 arranged along the circumferential direction, the groove 102 is positioned above the ball head connecting part 101, and the set of pins 13 penetrate into the ventilation block part and are positioned at the position of the groove 102.
According to one embodiment of the present invention, as shown in fig. 4, the fastening portion includes an upper base 4 and a slider 9, the slider 9 is configured to be slidable in a horizontal direction with respect to the upper base 4, and the slider 9 is connected to the depressed portion.
Preferably, the upper base 4 is provided with a guide portion along which the pressing portion is configured to move in the horizontal direction. More preferably, the guide portion is a slide slot 401, and the depressed portion passes through the slide slot 4.
As shown in fig. 4 or 5, the sliding base 9 is provided with a clamping groove 901, the clamping groove 901 of the sliding base is just clamped on the outer ring of the upper base 4 in a semi-enclosed manner, wherein the upper end portion of the sliding base 9 is clamped on the upper surface of the upper base 4, the lower end of the sliding base 9 completely wraps the lower surface of the upper base 4, and the lower end 91 of the sliding base 9 is provided with a threaded hole, so that the compression screw 10 can pass through and be connected with the same in a matching manner. The slider 9 can slide along the upper base 4 through the engaging groove 901 to adjust the horizontal position of the pressing portion.
According to one embodiment of the invention, the connecting portion may be a strut 3, as shown in fig. 4. Of course, the connection portion 3 may not be limited by this form or structure.
Preferably, the pressing portions and the pressing portions are connected to the connection portions at adjustable positions, respectively, to adjust a distance between the upper and lower portions in a height direction.
As shown in fig. 4, both the upper pressing portion and the lower pressing portion may be connected to the strut 3 by a screw 2.
Preferably, the pressing portion and the pressing portion are aligned along an axial central axis in the working state.
Preferably, the pressing portion comprises a sealing plug 5. The upper end of the sealing plug 5 is a cylinder which is just screwed into the lower preformed hole, and the periphery of the sealing plug can be sealed by a sealing ring such as an O-shaped ring 6. The arrangement of the sealing plug 5 can be determined according to the equipment to be detected, if the equipment to be detected is provided with a lower preformed hole, the sealing plug 5 can be arranged, otherwise, the pressing part is only provided with a pressing platform.
The pressing part can also comprise a lower base 1, the sealing plug 5 is connected with the lower base 1, and the sealing plug 5 and the lower base 1 can be an integrated piece or a split piece.
The position of the plug can be adjusted by adjusting the connecting position of the lower base 1 and the connecting part, and whether the sealed plug or the plug is used can be determined according to whether the bottom of a device to be detected, such as a core body, is provided with a hole or the size of the hole, during actual use. The sealing plug 5 and the ventilation plug 8 can be provided with bosses along the vertical direction, so that the effect of guiding alignment is achieved during actual operation, and the deviation of a sealing surface is prevented.
As shown in fig. 6, the lower base 1 may be provided with a base limiting groove 15, the fixing screw 14 may pass through the base limiting groove 15 to be connected with the sealing plug 5, and the upper end of the sealing plug 5 is provided with a plug boss 16.
Leak detection operation of the embodiment of the present invention: one end screwed joint 7 connects into the trachea, another termination manometer, aligns core passage hole with the end cap 8 of ventilating (or sealed end cap 5) the back and compresses tightly through rotatory compression screw 10 and seals, switches on intake pipe and termination manometer, with the product with leak hunting device immersion in water, annotate gas in the product cavity, whether appear leaking through the bubble that has on the visual observation product and the manometer has or not pressure to descend to judge the product.
The invention also provides a method for detecting leakage by using the leakage detecting device, which mainly comprises the following steps:
the upper preformed hole is tightly pressed at the upper preformed hole of the equipment to be detected by the upper pressing part;
and inputting detection gas through a gas channel of the upper pressure part, and checking whether the device to be detected leaks gas or not.
According to an embodiment of the invention, the method further comprises: the axial direction of the pressing part is adjusted to ensure that the leak detection device achieves the required sealing grade.
If the lower preformed hole exists, the lower preformed hole can be tightly sealed at the lower preformed hole of the device to be detected through the pressing part.
The leak detection device adopts axial compression sealing, has low requirement on aperture deviation, has large size adjustable range in the compression axial direction (namely the thickness difference of products), and has stronger universality.
Because the axial compression seal is adopted, the welding operation is not needed, the operation is convenient when the welding device is used, the adverse effect caused by secondary welding is eliminated, and the risk of pollution to a product cavity channel when a welding joint is removed is also solved.
The upper pressure part of the invention can be adjusted in a wide range of angles, and can achieve the function of axial deviation correction during pressing, thereby enhancing the sealing capability.
The middle part of the upper base of the embodiment of the invention is provided with the sliding groove, so that the effects of enabling the compression screw to pass and limiting can be achieved, the center of the sliding seat is provided with the threaded hole, the supporting force is provided for the compression screw during screwing, the compression effect is achieved, and meanwhile, the sliding seat can move back and forth along the upper base to adapt to products with different hole edge distances.
In a word, the invention can effectively improve the operation efficiency, reduce the production cost, avoid the occurrence of adverse conditions caused by secondary welding, has strong product adaptability, has high integral air tightness due to the axial deviation rectifying and compressing function, and completely meets the pre-leakage detection operation requirement of the core component of the high-pressure PCHE microchannel heat exchanger, and the test shows that the highest air tightness bearing capacity reaches 20 MPa.
Although the embodiment of the present invention is described by taking a PCHE microchannel heat exchanger as a leak detection device, the present invention is not limited thereto.
It should be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In addition, in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The foregoing embodiments are merely illustrative of the present invention, and various components and devices of the embodiments may be changed or eliminated as desired, not all components shown in the drawings are necessarily required, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, and all equivalent changes and modifications based on the technical solutions of the present invention should not be excluded from the scope of the present invention.
Claims (10)
1. Apparatus for leak detection, the apparatus comprising:
the upper pressing part is configured to tightly press the upper preformed hole at the upper preformed hole of the device to be leaked in a sealing mode, and comprises an air channel which is communicated with the upper preformed hole;
a pressing portion configured to apply upward pressure to the device to be leaked;
a connecting portion connecting the pressing-up portion and the pressing-down portion.
2. Leak detection apparatus according to claim 1, wherein the pressing portion includes a fastening portion and a pressing portion configured to be movable up and down relative to the fastening portion and lockable, the gas passage being provided in the pressing portion.
3. The leak detection apparatus according to claim 2, wherein the hold-down portion includes a vent block configured to sealingly connect with the upper preformed hole and a rectifying portion provided with the gas passage, the rectifying portion being spherically hinged with the vent block, the rectifying portion being movably connected with the fastening portion.
4. Leak detection apparatus according to claim 3, wherein the vent closure comprises a plug which engages with the upper preformed hole, the gas passage being provided in the plug, and preferably the vent closure further comprises a threaded joint which connects the gas passage.
5. The leak detection device according to claim 3 or 4, wherein the deviation correcting portion comprises a compression screw, the bottom end of the compression screw comprises a ball head connecting portion, and the upper end of the ventilation blocking portion comprises a spherical connecting hole matched with the ball head connecting portion; the circumferential surface of the compression screw includes a screw coupling portion to be screw-coupled with the fastening portion.
6. The leak detection apparatus according to claim 5, wherein the rectifying portion further includes a force applying portion to apply a downward pressure to the vent shutoff portion; the ventilation blocking part also comprises a stopping part for stopping the ball head connecting part of the compression screw from coming off; preferably, the stopping part comprises a group of pin shafts, the compression screw comprises a groove arranged along the circumferential direction, the groove is located above the ball head connecting part, and the group of pin shafts penetrate into the ventilating blocking part and are located at the position of the groove.
7. Leak detection apparatus according to one of claims 2 to 4 or 6, wherein the fastening section comprises an upper base and a slide carriage, the slide carriage being configured to be slidable in a horizontal direction relative to the upper base, the slide carriage being connected to the pressing section, preferably the upper base being provided with a guide along which the pressing section is configured to move in the horizontal direction; more preferably, the guide portion is a slide groove through which the depressed portion passes.
8. Leak detection apparatus according to any one of claims 1 to 4 or 6, wherein the hold-down portion is configured to sealingly hold down a lower preformed hole at the lower preformed hole of the device to be leak detected; preferably, the upper pressing part and the lower pressing part are respectively connected with the connecting part at adjustable positions; preferably, the pressing part and the pressing part are aligned along an axial central axis in an operating state; preferably, the pressing portion comprises a sealing plug.
9. A method of leak detection using the leak detection apparatus defined in any one of claims 1-8, the method comprising:
the upper preformed hole is tightly pressed at the upper preformed hole of the equipment to be detected by the upper pressing part;
and inputting detection gas through a gas channel of the upper pressure part, and checking whether the device to be detected leaks gas or not.
10. A method of leak detection as defined in claim 9, further comprising: the axial direction of the pressing part is adjusted to enable the leak detection device to reach the required sealing grade; and the lower preformed hole is tightly sealed at the lower preformed hole of the device to be detected through the pressing part.
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| CN202110521060.8A CN113252248A (en) | 2021-05-13 | 2021-05-13 | Leak detection device and using method thereof |
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| CN202110521060.8A CN113252248A (en) | 2021-05-13 | 2021-05-13 | Leak detection device and using method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486088A (en) * | 2022-04-02 | 2022-05-13 | 成都凯天电子股份有限公司 | Adjustable portable airtight detection device |
| CN116818228A (en) * | 2023-08-28 | 2023-09-29 | 山东中成包装科技有限公司 | Test equipment for tightness of plastic container |
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| CN210347027U (en) * | 2019-09-18 | 2020-04-17 | 东莞燊安塑胶模具有限公司 | Air tightness testing device for holes |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114486088A (en) * | 2022-04-02 | 2022-05-13 | 成都凯天电子股份有限公司 | Adjustable portable airtight detection device |
| CN116818228A (en) * | 2023-08-28 | 2023-09-29 | 山东中成包装科技有限公司 | Test equipment for tightness of plastic container |
| CN116818228B (en) * | 2023-08-28 | 2023-11-07 | 山东中成包装科技有限公司 | Test equipment for tightness of plastic container |
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