CN112129468A - Complex fluid pipeline air tightness detection system and detection method based on bubbling method - Google Patents
Complex fluid pipeline air tightness detection system and detection method based on bubbling method Download PDFInfo
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- CN112129468A CN112129468A CN202011196314.5A CN202011196314A CN112129468A CN 112129468 A CN112129468 A CN 112129468A CN 202011196314 A CN202011196314 A CN 202011196314A CN 112129468 A CN112129468 A CN 112129468A
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- pressure supply
- pipeline
- clamping
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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
- G01M3/083—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 tubes
Abstract
The invention discloses a complex fluid pipeline air tightness detection system based on a bubbling method, which comprises the following steps: the upper end of the water tank is opened; the base is positioned inside the water tank; the pressure supply unit is arranged on the base; the clamping unit is arranged on the base, and a gap is reserved between the clamping unit and the pressure supply unit; the supporting unit is arranged on the base and is positioned between the pressure supply unit and the clamping unit; and one end of the pipeline to be detected is communicated with the pressure supply unit, and the other end of the pipeline to be detected is connected with the clamping unit. A detection method is also disclosed, and a detection system is adopted for detection. The invention solves the technical problems of difficult detection and low detection precision of the leakage of the fluid pipeline with the micro-scale complex surface in the prior art.
Description
Technical Field
The invention relates to the technical field of fluid conveying pipeline detection, in particular to a complex fluid pipeline airtightness detection system and method based on a bubbling method.
Background
In the fields of aerospace, automobiles, ships and the like, safety accidents caused by faults such as pipeline leakage, breakage and the like are frequent due to the fact that a fluid pipeline system works in severe environments such as high temperature, high pressure, severe vibration and the like for a long time. In order to ensure the operational reliability of the fluid line, the quality reliability of the fluid line must be checked before it is put into use. With the development of fluid limit technology, the compactness of fluid machines is higher and higher, resulting in the development of fluid pipelines in high torsion, variable cross section, complex configuration, microscale and the like. This brings technical difficulties to the detection of the air tightness.
Conventional leak detection methods are limited. For example, the invention patent with the application number of CN201810689122.4, "a negative pressure wave method pipeline leakage detection system based on online simulation", provides an online pipeline leakage detection method, which includes a better-performing element, a remote control terminal, a monitoring control system, and the like, and can realize online leakage detection of a large-scale remote fluid transportation pipeline, but is not suitable for a micro-scale pipeline. In addition, the basic principle of the negative pressure wave method is to determine the time difference of the pressure pulsation propagating in the pipeline, the propagation speed of the pressure wave along the pipeline is considered to be unchanged in the process, in the complex-profile fluid pipeline, a series of behaviors such as reflection, interference and the like can be generated on the wall surface in the pressure wave propagation process, and the time difference of the negative pressure wave propagation cannot be accurately quantified, so that the method is obviously not suitable for the leakage detection of the complex-profile fluid pipeline; for example, the invention patent "capacitive liquid leakage detection device" with application number CN202010108095.4 discloses that the device includes a pump cylinder, a pump chamber, a piston, a driver, etc., and when the fluid driven by the leakage reaches a threshold value, the system will generate an alarm. Although the system can be used for detecting the leakage of the fluid pipeline with the micro-scale complex profile, each system requires that the leakage amount reaches a certain value, and is insensitive to the weak leakage amount, so that the detection precision is limited.
Disclosure of Invention
The invention aims to provide a complex fluid pipeline air tightness detection system and a complex fluid pipeline air tightness detection method based on an bubbling method, and solves the technical problems that in the prior art, the detection of the leakage of a micro-scale complex surface fluid pipeline is difficult and the detection precision is low.
The embodiment of the application discloses complicated fluid pipe airtightness detection system based on bubbling method includes:
the upper end of the water tank is opened;
a base located inside the water tank;
a pressure supply unit installed on the base;
the clamping unit is arranged on the base, and a gap is reserved between the clamping unit and the pressure supply unit;
the supporting unit is arranged on the base and is positioned between the pressure supply unit and the clamping unit;
and one end of the pipeline to be detected is communicated with the pressure supply unit, and the other end of the pipeline to be detected is connected with the clamping unit.
According to the embodiment of the application, the micro-scale complex-surface fluid pipeline is assembled by combining the pressure supply system, the clamping system and the supporting system, high-pressure gas is introduced into the pipeline, and high-precision leakage detection is realized by using the principle that leakage gas generates bubbles in water.
On the basis of the technical scheme, the embodiment of the application can be further improved as follows:
further, spaced apart on the base and be equipped with a plurality of outlet and bolt hole, the beneficial effect of this step of adoption is that the base moves down in the water tank through the outlet.
Further, the pressure supply unit includes:
the pressure supply bracket is arranged on the base;
the pressure supply cylinder fixing seat is arranged at the upper end of the pressure supply bracket;
the pressure supply cylinder is arranged at the upper end of the pressure supply bracket;
the pressure supply head is arranged at the movable piston end of the pressure supply cylinder, and the beneficial effect of the step is that the pressure is provided by the pressure supply unit.
Furthermore, the pressure supply head is provided with an air bleed port along the radial direction, an air inlet is formed in the center of the pressure supply head, and the air inlet is communicated with the pipeline to be detected.
Further, the end part of the pressure supply head is in threaded connection with a connector, the interior of the connector is in threaded connection with a pressure supply head air inlet pipe, the outer end of the connector is connected with a lip, and the lip is connected with a pipeline to be detected.
Further, the clamping unit includes:
the clamping support is arranged on the base;
the clamping cylinder fixing seat is arranged on one side of the upper end of the clamping bracket;
the pipeline clamping seat is arranged on the other side of the upper end of the clamping bracket;
the clamping cylinder is arranged on the clamping cylinder fixing seat;
and the pressing rod is arranged at the piston end of the clamping cylinder and corresponds to the pipeline clamping seat.
Further, the supporting unit includes:
a support bracket mounted on the base;
the pipeline supporting seat is installed at the top end of the supporting bracket.
The embodiment of the application also discloses a detection method, which adopts the complex fluid pipeline air tightness detection system based on the bubbling method to carry out detection.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the embodiment of the application provides a customized loading system, and the detection requirements of fluid pipelines with different scales and complex profiles are met;
2. in the embodiment of the application, the tiny leakage amount can generate bubbles underwater, and the detection sensitivity of the system is higher;
3. the embodiment of the application has the advantages of simple structure, no high-cost electronic components and low use cost;
4. the embodiment of the application is simple to operate, low in technical requirement on users and wider in client-oriented range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a complex fluid pipeline airtightness detection system based on a bubbling method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a base structure of a complex fluid pipeline airtightness detection system based on a bubbling method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a pressure supply unit of a complex fluid pipeline airtightness detection system based on a bubbling method according to an embodiment of the present invention;
fig. 4 is a cross-sectional view of a pressure supply unit of a complex fluid pipeline airtightness detection system based on a bubbling method according to an embodiment of the present invention;
fig. 5 is a schematic view of a clamping unit of a complex fluid pipeline airtightness detection system based on a bubbling method according to an embodiment of the present invention;
fig. 6 is a supporting unit of a complex fluid pipeline airtightness detection system based on the bubbling method according to an embodiment of the present invention;
reference numerals:
1-a water tank; 2-a base; 3-a pressure supply unit; 4-a clamping unit; 5-a support unit; 6-a pipeline to be detected, and 7-a water drainage hole; 8-bolt holes; 9-a pressure supply bracket; 10-a pressure supply cylinder fixing seat; 11-a pressure supply cylinder; 12-a pressure supply head; 13-supply pressure cylinder moving piston end; 14-a bleed port; 15-air inlet; 16-an interface; 17-supply pressure head air inlet pipe; 18-a rubber gasket; 19-lip; 20-clamping a bracket; 21-clamping cylinder fixing seat; 22-a clamping cylinder; 23-a pressure bar; 24-pipeline clamping seat; 25-clamping the piston end of the cylinder; 26-a support bracket; 27-pipeline support seat.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the description of the present application, it is to be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The complex fluid pipeline air tightness detection system and method based on the bubbling method solve the technical problems that in the prior art, the detection of leakage of a micro-scale complex surface fluid pipeline is difficult and the detection precision is low.
According to the embodiment of the application, the micro-scale complex-surface fluid pipeline is assembled by combining the pressure supply system, the clamping system and the supporting system, high-pressure gas is introduced into the pipeline, and high-precision leakage detection is realized by using the principle that leakage gas generates bubbles in water.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1-2, the air-tightness detecting system for complex fluid pipeline based on bubbling method provided in this embodiment includes:
the water tank 1 is a container with an opening at the upper end, wherein the water tank 1 is an open container with certain water storage capacity, the sectional dimension of the open container is determined according to the required horizontal projection dimension of the pipeline 6 to be detected, and a base 2 for loading the system such as the pipeline 6 to be detected and the like can freely move in the vertical direction of the water tank 1 without being blocked;
the base 2 is a flat plate structure designed according to the shape of the pipeline to be detected, is mainly used for bearing the pressure supply unit 3, the clamping unit 4, the supporting unit 5 and the like, and can move up and down relative to the water tank under the action of external force; wherein the base 2 is provided with a series of water drainage holes 7 for pressure relief when the bottom plate enters and exits the water tank; meanwhile, a series of bolt holes 8 are reserved on the base 2 according to requirements and used for assembling the pressure supply unit 3, the clamping unit 4 and the supporting unit 5;
the pressure supply unit 3 is arranged on the base 2, and the pressure supply unit 3 pressurizes the interior of the pipeline to be detected;
the clamping units 4 are arranged on the base 2 at intervals, and a gap is reserved between each clamping unit 4 and the corresponding pressure supply unit 3, and the clamping units 4 are used for clamping the to-be-detected pipeline 6 and realizing the space positioning of the to-be-detected pipeline 6 in the embodiment of the application;
the supporting unit 5 is installed on the base 2, the supporting unit 5 is located between the pressure supply unit 3 and the clamping unit 4, and the supporting unit 5 is mainly used for supporting the pipeline 6 to be detected and preventing the pipeline from being bent when the pipeline is long;
and one end of the pipeline 6 to be detected is communicated with the pressure supply unit 3, and the other end of the pipeline 6 to be detected is connected with the clamping unit 4.
Specifically, as shown in fig. 3 to 4, the pressure supply unit 3 includes:
the pressure supply bracket 9 is arranged on the base 2, and the pressure supply bracket 9 is used as a support part for supporting other components;
the pressure supply cylinder fixing seat 10 is arranged at the upper end of the pressure supply bracket 9, and the pressure supply cylinder fixing seat 10 is arranged at the upper end of the pressure supply bracket 9;
the pressure supply cylinder 11 is arranged at the upper end of the pressure supply bracket 9;
the pressure supply head 12 is arranged at the movable piston end 13 of the pressure supply cylinder 12; the pressure supply head 12 in the embodiment of the present application is used to perform gas supply.
The pressure supply head 12 is provided with a gas introducing port 14 along the radial direction, the center of the pressure supply head 12 is provided with a gas inlet 15, the gas inlet 15 is communicated with the pipeline 6 to be detected, the end part of the pressure supply head 12 is connected with a connector 16 in a threaded manner, a pressure supply head gas inlet pipe 17 is connected in the connector 16 in a threaded manner, the outer end of the connector is connected with a lip 19, and the lip 19 is connected with the pipeline 6 to be detected; in the embodiment of the application, a rubber gasket 18 is arranged between the interface 16 and the pressure supply head air inlet pipe 17 and used for sealing the pipe orifice, and a lip 19 on the other side of the interface 16 is matched with the pipeline 6 to be detected in shape and used for completing assembly; if the pipeline 6 to be detected has leakage, the leakage gas will generate bubbles in the water tank 1, otherwise the pipeline has good air tightness. Wait to detect pipeline 6 in this application embodiment and tightly fix the back by clamping unit 4 clamp, supply pressure head 12 under the drive that supplies pressure cylinder piston 13, will be to waiting to detect the removal of 6 mouth of pipe directions of pipeline, wait to detect the pipeline 6 mouth of pipe this moment and will extrude rubber gasket 18, cooperate rubber gasket 18 compressive deformation and supply pressure head intake pipe 17 in close contact with, realize sealed effect.
As shown in fig. 5, the clamping unit 4 includes:
the clamping support 20 is mounted on the base 2;
the clamping cylinder fixing seat 21 is arranged on one side of the upper end of the clamping support 20;
the pipeline clamping seat 24 is arranged on the other side of the upper end of the clamping bracket 20;
the clamping cylinder 22 is installed on the clamping cylinder fixing seat 21;
and the pressing rod 23 is arranged at the piston end 25 of the clamping cylinder, and the pressing rod 23 corresponds to the pipeline clamping seat 24.
Wherein, as shown in fig. 6, the supporting unit 5 includes:
a support bracket 26, the support bracket 26 being mounted on the base 2;
a pipeline supporting seat 27, wherein the pipeline supporting seat 27 is arranged at the top end of the supporting bracket 26; before the pipeline 6 to be detected is clamped, the piston end 25 of the clamping cylinder and the pressure rod 23 are in an extending state, after the pipeline 6 to be detected is placed in the pipeline clamping seat, the piston 25 of the clamping cylinder retracts, and the pressure rod 23 clamps the pipeline 6 to be detected.
In the embodiment of the application, the number of the pressure supply units 3, the clamping units 4 and the supporting units 5, the axial direction of the cylinders in each system, the relative position of the pipeline seat and the like are not limited to the conditions shown in the figures, and the number is determined according to the condition of the pipeline 6 to be detected; the lines 6 to be tested in the system are not representative of the particular shape of the lines shown in the figures, but rather are representative of a wide range of complex profile fluid lines, by way of example only, for ease of analysis.
The embodiment of the application realizes the detection and loading of the pipeline by adopting the pressure supply system, the clamping system and the supporting system which are customized according to requirements, and is suitable for the characteristics of the micro-scale and the complex molded surface of the pipeline to be detected; the principle that bubbles are generated underwater when high-pressure gas leaks is utilized, whether the pipeline leaks or not is judged, high-precision fluid pipeline leakage detection is achieved, and reliability of a detection system is improved.
The embodiment of the application also discloses a detection method, namely the detection is carried out by adopting the complex fluid pipeline air tightness detection system based on the bubbling method.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. The utility model provides a complicated fluid pipe way gas tightness detecting system based on bubbling method which characterized in that includes:
the water tank (1), the upper end of the water tank (1) is open;
a base (2), the base (2) being located inside the water tank (1);
a pressure supply unit (3), the pressure supply unit (3) being mounted on the base (2);
the clamping unit (4) is installed on the base (2), and a gap is reserved between the clamping unit (4) and the pressure supply unit (3);
the supporting unit (5) is installed on the base (2), and the supporting unit (5) is located between the pressure supply unit (3) and the clamping unit (4);
and one end of the pipeline (6) to be detected is communicated with the pressure supply unit (3), and the other end of the pipeline (6) to be detected is connected with the clamping unit (4).
2. The complex fluid pipeline airtightness detection system based on the bubbling method according to claim 1, wherein a plurality of drainage holes (7) and bolt holes (8) are provided at intervals on the base (2).
3. The complex fluid pipe airtightness detection system based on the bubbling method according to claim 2, wherein the pressure supply unit (3) includes:
the pressure supply support (9), the pressure supply support (9) is installed on the base (2);
the pressure supply cylinder fixing seat (10), the pressure supply cylinder fixing seat (10) is installed at the upper end of the pressure supply bracket (9);
the pressure supply cylinder (11), the pressure supply cylinder (11) is arranged at the upper end of the pressure supply bracket (9);
the pressure supply head (12), the pressure supply head (12) is installed on the movable piston end (13) of the pressure supply cylinder (11).
4. The complex fluid pipeline airtightness detection system based on the bubbling method according to claim 3, wherein the pressure supply head (12) is provided with an air bleed port (14) along a radial direction, an air inlet (15) is formed in the center of the pressure supply head (12), and the air inlet (15) is communicated with the pipeline (6) to be detected.
5. The complex fluid pipeline airtightness detection system based on the bubbling method according to claim 4, wherein an end of the pressure supply head (12) is in threaded connection with a connector (16), an internal threaded connection of the connector (16) is provided with a pressure supply head air inlet pipe (17), an outer end of the connector (16) is connected with a lip (19), and the lip (19) is connected with the pipeline (6) to be detected.
6. The bubbling-based complex fluid pipeline airtightness detection system according to claim 5, wherein the clamping unit (4) comprises:
the clamping support (20), the clamping support (20) is installed on the base (2);
the clamping cylinder fixing seat (21) is mounted on one side of the upper end of the clamping support (20);
the pipeline clamping seat (24) is arranged on the other side of the upper end of the clamping bracket (20);
the clamping cylinder (22), the clamping cylinder (22) is installed on the clamping cylinder fixing seat (21);
the pressing rod (23) is installed at the piston end (25) of the clamping cylinder, and the pressing rod (23) corresponds to the pipeline clamping seat (24).
7. The complex fluid pipe airtightness detection system based on the bubbling method according to claim 2, wherein the support unit (5) includes:
a support bracket (26), the support bracket (26) being mounted on the base (2);
a pipeline supporting seat (27), wherein the pipeline supporting seat (27) is arranged at the top end of the supporting bracket (26).
8. The detection method is characterized in that the detection is carried out by adopting the complex fluid pipeline airtightness detection system based on the bubbling method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011196314.5A CN112129468A (en) | 2020-10-30 | 2020-10-30 | Complex fluid pipeline air tightness detection system and detection method based on bubbling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011196314.5A CN112129468A (en) | 2020-10-30 | 2020-10-30 | Complex fluid pipeline air tightness detection system and detection method based on bubbling method |
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| Publication Number | Publication Date |
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| CN112129468A true CN112129468A (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011196314.5A Withdrawn CN112129468A (en) | 2020-10-30 | 2020-10-30 | Complex fluid pipeline air tightness detection system and detection method based on bubbling method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2231400A1 (en) * | 1971-07-02 | 1973-01-18 | Varian Associates | LEAK DETECTOR |
| US4918968A (en) * | 1989-07-10 | 1990-04-24 | Hoffman Kenneth L | Apparatus and method of detecting leaks in pressurized piping systems |
| GB201107810D0 (en) * | 2011-05-11 | 2011-06-22 | Syrinix Ltd | Pipeline fault detection system and monitor unit |
| CN203745151U (en) * | 2014-02-21 | 2014-07-30 | 江苏凯联达电子科技有限公司 | Multi-station metal pipeline airtightness detector |
| CN105067197A (en) * | 2015-08-03 | 2015-11-18 | 曲靖维拓科技有限公司 | Automobile intake pipe air tightness detection device and detection method |
| CN108562413A (en) * | 2018-06-13 | 2018-09-21 | 武汉金丰汽配有限公司 | A kind of air tightness of pipe fitting detection workbench |
| CN208109359U (en) * | 2018-04-17 | 2018-11-16 | 长春一汽四环汽车管路有限公司 | A kind of online air-leakage detector |
| CN210424514U (en) * | 2019-06-13 | 2020-04-28 | 北京动力源科技股份有限公司 | Water circulation pipeline leakage detection device |
-
2020
- 2020-10-30 CN CN202011196314.5A patent/CN112129468A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2231400A1 (en) * | 1971-07-02 | 1973-01-18 | Varian Associates | LEAK DETECTOR |
| US4918968A (en) * | 1989-07-10 | 1990-04-24 | Hoffman Kenneth L | Apparatus and method of detecting leaks in pressurized piping systems |
| GB201107810D0 (en) * | 2011-05-11 | 2011-06-22 | Syrinix Ltd | Pipeline fault detection system and monitor unit |
| CN203745151U (en) * | 2014-02-21 | 2014-07-30 | 江苏凯联达电子科技有限公司 | Multi-station metal pipeline airtightness detector |
| CN105067197A (en) * | 2015-08-03 | 2015-11-18 | 曲靖维拓科技有限公司 | Automobile intake pipe air tightness detection device and detection method |
| CN208109359U (en) * | 2018-04-17 | 2018-11-16 | 长春一汽四环汽车管路有限公司 | A kind of online air-leakage detector |
| CN108562413A (en) * | 2018-06-13 | 2018-09-21 | 武汉金丰汽配有限公司 | A kind of air tightness of pipe fitting detection workbench |
| CN210424514U (en) * | 2019-06-13 | 2020-04-28 | 北京动力源科技股份有限公司 | Water circulation pipeline leakage detection device |
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Application publication date: 20201225 |