CN111912579A - Sealing leakage detection device - Google Patents

Sealing leakage detection device Download PDF

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Publication number
CN111912579A
CN111912579A CN202010845029.5A CN202010845029A CN111912579A CN 111912579 A CN111912579 A CN 111912579A CN 202010845029 A CN202010845029 A CN 202010845029A CN 111912579 A CN111912579 A CN 111912579A
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CN
China
Prior art keywords
sealing
workpiece
sealing ring
piece
leakage detection
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010845029.5A
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Chinese (zh)
Inventor
林琦武
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Jiangmen Longhao Intelligent Equipment Co ltd
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Jiangmen Longhao Intelligent Equipment Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangmen Longhao Intelligent Equipment Co ltd filed Critical Jiangmen Longhao Intelligent Equipment Co ltd
Priority to CN202010845029.5A priority Critical patent/CN111912579A/en
Publication of CN111912579A publication Critical patent/CN111912579A/en
Pending legal-status Critical Current

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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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • 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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

The invention provides a sealing leakage detection device, which comprises the following components: the leakage detection box is provided with an accommodating space, and the accommodating space is used for placing a workpiece to be detected; the sealing device is arranged in the accommodating cavity of the leakage detection box and comprises a sealing ring and a sealing pushing piece, the sealing ring is arranged at the opening of the workpiece to be detected, and the sealing pushing piece is used for extruding the sealing ring so as to enable the sealing ring to seal the opening of the workpiece to be detected; the output port of the inflation device is communicated with the interior of the workpiece to be detected; and the detection device is communicated with the inside of the leakage detection box and is used for detecting the gas in the leakage detection box. The sealing ring can not rub with the workpiece to be detected, the surface of the sealing ring is not easy to damage, the service life of the sealing ring is longer, and the service life of the sealing device is longer.

Description

Sealing leakage detection device
Technical Field
The invention belongs to the technical field of leak detection, and particularly relates to a sealing leak detection device.
Background
In the prior art, along with the development of scientific technology, no matter in the technical field of vacuum or high-pressure air tightness engineering, the air tightness requirement of a part or a system is improved along with the development of the scientific technology, so that the research on improving the air tightness detection precision and influencing the air tightness factor is very urgent. Part opening work piece that awaits measuring need seal the opening at leak hunting in-process, and current leak hunting device is right the position that the opening sealed carries out generally uses flexible material, carries out interference fit sealing like rubber, long-time friction use back, flexible material takes place wearing and tearing easily. Therefore, the existing leak detection device has the technical defect of short service life.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a sealing leakage detection device.
The sealing leakage detection device of one embodiment of the invention comprises:
the leakage detection box is provided with an accommodating space, and the accommodating space is used for placing a workpiece to be detected;
the sealing device is arranged in the accommodating cavity of the leakage detection box and comprises a sealing ring and a sealing pushing piece, the sealing ring is arranged at the opening of the workpiece to be detected, and the sealing pushing piece is used for extruding the sealing ring so as to enable the sealing ring to seal the opening of the workpiece to be detected;
the output port of the inflation device is communicated with the interior of the workpiece to be detected;
and the detection device is communicated with the inside of the leakage detection box and is used for detecting the gas in the leakage detection box.
The sealing leak detection device is provided with the sealing device, the sealing device can seal an opening of a workpiece to be detected, the sealing device extrudes and deforms the sealing ring through the sealing pushing piece, so that the sealing ring is more closely attached to the opening of the workpiece to be detected, the sealing performance is enhanced, the sealing ring cannot rub against the workpiece to be detected, the surface of the sealing ring is not easy to damage, the service life of the sealing ring is longer, and the service life of the sealing device is longer.
In a preferable or optional embodiment, the sealing pushing piece comprises a sealing pushing rod and a sealing platform, the sealing platform is arranged at the front end of the sealing rod, an annular groove is formed in the front end of the sealing platform, the annular groove is matched with the sealing ring, the sealing pushing piece is provided with an air duct, and an output port of the inflating device is communicated with the inside of the workpiece to be tested through the air duct.
In a preferable or optional embodiment, the sealing device further comprises a sealing pulling piece, the sealing pulling piece is sleeved on the sealing pushing piece, the sealing ring is arranged between the sealing pushing piece and the sealing pulling piece, the sealing pushing piece is provided with a vent pipe, and an output port of the inflation device is communicated with the inside of the workpiece to be tested through the vent pipe.
In a preferable or optional embodiment, the sealing device further comprises a sealing pulling piece, the sealing pulling piece is arranged in the sealing pushing piece in a penetrating mode, the sealing ring is arranged between the sealing pushing piece and the sealing pulling piece, the sealing pulling piece is provided with an air duct, and an output port of the inflation device is communicated with the inside of the workpiece to be tested through the air duct.
In a preferred or alternative embodiment, the leak detection gas is a halogen gas, helium gas, or hydrogen gas.
In a preferred or optional embodiment, the seal leakage detecting device further comprises a fixing device, the fixing device is arranged on the outer side of the workpiece to be detected, and the fixing device is used for fixing the workpiece to be detected.
In a preferred or alternative embodiment, the hermetic leak detection apparatus further comprises:
the stress sensor is arranged on the sealing device and used for detecting the pressure applied to the sealing ring;
and the control device is respectively electrically connected with the sealing device and the stress sensor, and controls the sealing device to extrude the sealing ring according to the pressure applied to the sealing ring.
In a preferred or alternative embodiment, the hermetic leak detection apparatus further comprises:
the air release valve is arranged on the surface of the leakage detection box;
and the silencer is arranged at the output port of the air release valve.
In a preferred or alternative embodiment, the hermetic leak detection apparatus further comprises:
the vacuum pump is communicated with the interior of the leakage detection box;
the vacuum gauge is arranged on the surface of the leakage detection box and detects the vacuum degree of the leakage detection box.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of the overall configuration of a leak detecting apparatus sealed in embodiment 1 of the invention;
FIG. 2 is a schematic view showing the structure of a sealing device according to embodiment 1 of the present invention;
FIG. 3 is a first structural view of a fixing device according to embodiment 1 of the present invention;
FIG. 4 is a second structural view of the fixing device according to embodiment 1 of the present invention;
FIG. 5 is a schematic view of a part of a leak detecting apparatus sealed in embodiment 2 of the invention;
FIG. 6 is a schematic view showing the structure of a sealing device according to example 2 of the present invention;
FIG. 7 is a schematic view of a part of a leak detecting apparatus sealed in embodiment 3 of the invention;
fig. 8 is a schematic structural view of a sealing device according to embodiment 3 of the present invention.
The drawings illustrate schematically: 1. a leak detection box; 2. a sealing device; 21. a seal ring; 22. sealing the pushing piece; 221. sealing the push rod; 222. a sealing table; 223. an annular groove; 23. an air duct; 24. sealing the pull piece; 3. an inflator; 4. a detection device; 5. a fixing device; 6. a vacuum pump; 7. a deflation valve; 8. a muffler; 9. a vacuum gauge; 10. and (5) a workpiece to be detected.
Detailed Description
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of the overall structure of a leak detection device sealed in embodiment 1 of the present invention.
The sealing leakage detection device provided by the embodiment comprises a leakage detection box 1 with an accommodating space, a sealing device 2, an inflating device 3 with leakage detection gas, a detection device 4 and a vacuum pump 6. The containing space is used for placing a workpiece 10 to be tested, the sealing device 2 is arranged in the containing cavity of the leakage detection box 1, the output port of the inflating device 3 is communicated with the inside of the workpiece 10 to be tested, the detection device 4 is communicated with the inside of the leakage detection box 1, and the vacuum pump 6 is communicated with the inside of the leakage detection box 1.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a sealing device according to embodiment 1 of the present invention.
Sealing device 2 includes sealing washer 21 and sealed 22 that push away, sealing washer 21 sets up the opening of work piece 10 awaits measuring, sealed 22 that push away is used for the extrusion sealing washer 21 is so that sealing washer 21 seals the opening of work piece 10 awaits measuring, sealing washer 21 the shape with the opening phase-match of work piece 10 awaits measuring, sealing washer 21's shape can be ring shape, polygon or anomalous shape. The sealing push piece 22 comprises a sealing push rod 221 and a sealing platform 222, the sealing platform 222 is arranged at the front end of the sealing rod, an annular groove 223 is arranged at the front end of the sealing platform 222, the annular groove 223 is matched with the sealing ring 21, and the shape of the annular groove 223 can be a circular ring shape, a polygon shape or an irregular shape.
Referring to fig. 3 and fig. 4, fig. 3 is a first structural schematic diagram of a fixing device according to embodiment 1 of the present invention, and fig. 4 is a second structural schematic diagram of the fixing device according to embodiment 1 of the present invention.
The working principle of the sealing device 2 is as follows: the sealing device 2 of the present embodiment mainly detects the openings of the workpiece 10 to be measured, the surfaces of which are located in the same plane. Firstly, the sealing ring 21 is placed on the opening, the sealing ring 21 may be pre-arranged on the opening or in the annular groove 223, then the sealing push rod 221 and the sealing platform 222 extrude and fix the sealing ring 21 towards the opening, the sealing ring 21 is deformed under stress, so that the sealing ring 21 is more attached to the edge of the opening, and the sealing performance of the opening is improved. Because the sealing ring 21 is sealed and attached to the opening of the workpiece 10 to be measured through extrusion deformation, the surface of the sealing ring 21 does not rub against the workpiece 10 to be measured or the sealing push piece 22, so that the outer surface of the sealing ring 21 is not easily damaged, and the service life of the sealing ring 21 is prolonged.
The sealing push piece 22 is provided with an air duct 23, and the output port of the air charging device 3 is communicated with the inside of the workpiece 10 to be tested through the air duct 23. Specifically, the air duct 23 penetrates through the central axis of the sealing plunger 221 and the sealing platform 222, so that the air duct 23 is smoother when the inflator 3 inflates.
The detection device 4 is used for detecting the gas in the leak detection box 1, the leak detection gas is halogen gas, helium gas, hydrogen gas or other detectable media, and correspondingly, the detection device 4 is a halogen gas detector, a helium mass spectrometer leak detector, a hydrogen gas detector or other detection devices 4.
The sealing leakage detection device further comprises a fixing device 5, the fixing device 5 is arranged on the outer side of the workpiece 10 to be detected, and the fixing device 5 is used for fixing the workpiece 10 to be detected. The fixing device 5 may be a plurality of fixing rods, or may be a fixture, etc. commonly used by those skilled in the art.
The sealing leakage detection device further comprises a stress sensor, the stress sensor is arranged on the sealing device 2, and the stress sensor is used for detecting the pressure applied to the sealing ring 21. The stress sensor may be disposed at an end of the sealing push rod 221, and the pressure applied to the sealing ring 21 is calculated by calculating a force relationship between the sealing platform 222 and the end of the sealing push rod 221.
The sealing leakage detection device further comprises a control device, the control device is respectively electrically connected with the sealing device 2 and the stress sensor, and the control device controls the sealing device 2 to extrude the sealing ring 21 according to the pressure applied to the sealing ring 21. The control device can control the sealing pushing piece 22 through a motor, a transmission gear, a transmission rod, a screw rod and the like, so that the sealing pushing piece 22 extrudes the sealing ring 21. The control device adjusts the extrusion force of the sealing pushing piece 22 to the sealing ring 21 according to the stress state of the sealing ring 21 and the change of the internal pressure and the external pressure of the workpiece 10 to be measured, so that the sealing effect is ensured.
The seal leak detection apparatus further includes: a release valve 7, a silencer 8 and a vacuum gauge 9. The air release valve 7 is arranged on the surface of the leakage detection box 1, and the air release valve 7 is used for releasing the gas in the leakage detection box 1. The muffler 8 is arranged at the output port of the deflation valve, and the muffler 8 muffles in the deflation process of the deflation valve 7 to reduce the noise of the sealing leakage detection device. The vacuum gauge 9 is arranged on the surface of the leakage detection box 1, and the vacuum gauge 9 detects the vacuum degree of the leakage detection box 1 to ensure that the vacuum degree of the leakage detection box 1 meets the detection requirement.
The working principle is as follows: will the work piece 10 that awaits measuring fixes in the accommodation space of leak detection case 1, sealing device 2 is right the opening of the work piece 10 that awaits measuring is sealed, opens vacuum pump 6 will leak detection case 1 evacuates to find time, vacuum gauge 9 detects the vacuum of leak detection case 1, when in the default time, the vacuum of leak detection case 1 does not reach the vacuum corresponding with the default time, proves the work piece 10 that awaits measuring has big leak, stops the leak hunting procedure. And when the vacuum degree of the leakage detection box 1 is consistent with the vacuum degree corresponding to the preset time within the preset time, continuing the leakage detection program. The inflation device 3 inflates the leak detection gas into the workpiece 10 to be detected through the ventilation pipeline 23, and the detection device 4 detects the gas in the accommodating space of the leak detection box 1 to detect whether the gas is mixed with the leak detection gas. When the inflation device 3 is inflated to the leak detection gas, the air pressure in the workpiece 10 to be detected rises, the opening of the workpiece 10 to be detected is easy to deform, the stress sensor records the stress condition of the sealing ring 21, the control device adjusts the size of the extrusion force of the sealing pushing piece 22 on the sealing ring 21 for several times, and the sealing failure caused by overlarge pressure or other factors is found in time.
In the sealed leak detection device of this embodiment, be provided with sealing device, sealing device can seal the opening of the work piece that awaits measuring, sealing device passes through sealed the piece that pushes away is right the sealing washer carries out extrusion deformation, makes the sealing washer with the opening of the work piece that awaits measuring is hugged closely more, has strengthened the leakproofness, moreover the sealing washer can not with the work piece that awaits measuring rubs, the surface of sealing washer is difficult to the damage, the life-span of sealing washer is longer, sealing device's life is longer.
Example 2
Referring to fig. 5 and fig. 6 together, fig. 5 is a schematic view of a part of a sealing leak detection apparatus according to embodiment 2 of the present invention, and fig. 6 is a schematic view of a sealing apparatus according to embodiment 2 of the present invention.
The main difference between this embodiment and embodiment 1 is the structure of the sealing device 2.
Sealing device 2 includes sealing washer 21 and sealed pushing away piece 22, sealing washer 21 sets up the opening of work piece 10 that awaits measuring, sealed pushing away piece 22 is used for the extrusion sealing washer 21 is so that sealing washer 21 seals the opening of work piece 10 that awaits measuring, specifically speaking, the front end lid that sealed pushing away piece 22 closed the opening of work piece 10 that awaits measuring. The shape of the sealing ring 21 is matched with the opening of the workpiece 10 to be measured, and the shape of the sealing ring 21 can be a circular ring shape, a polygon shape or an irregular shape. The sealing device 2 further comprises a sealing pulling piece 24, the sealing pulling piece 24 is sleeved on the sealing pushing piece 22 and the opening of the workpiece 10 to be tested, the sealing ring 21 is arranged between the sealing pushing piece 22 and the sealing pulling piece 24, the sealing pushing piece 22 is provided with an air duct 23, and the output port of the air charging device 3 is communicated with the inside of the workpiece 10 to be tested through the air duct 23.
The working principle of the sealing device 2 is as follows: the sealing device 2 of the present embodiment mainly detects the workpiece 10 to be measured in which the opening of the workpiece 10 to be measured is higher than the surface of the workpiece 10 to be measured. Firstly, the sealing ring 21 is sleeved on the opening, the sealing ring 21 may be sleeved on the opening in advance, or may be arranged on the sealing pushing member 22 or the sealing pulling member 24 in advance, and then the sealing pushing member 22 and the sealing pulling member 24 interact with each other, so that the sealing ring 21 is deformed under stress, the sealing ring 21 is made to be more attached to the outer surface of the opening, and the sealing performance of the opening is improved. Because the sealing ring 21 is sealed and attached to the opening of the workpiece 10 to be measured through extrusion deformation, the surface of the sealing ring 21 does not rub against the workpiece 10 to be measured or the sealing push piece 22, so that the outer surface of the sealing ring 21 is not easily damaged, and the service life of the sealing ring 21 is prolonged.
In this embodiment, the control device may control the seal pushing element 22 or the seal pulling element 24, as long as the seal pushing element 22 and the seal pulling element 24 can press the seal ring 21.
Example 3
Referring to fig. 7 and 8 together, fig. 7 is a schematic view of a part of a sealing leak detection apparatus according to embodiment 3 of the present invention, and fig. 8 is a schematic view of a sealing apparatus according to embodiment 3 of the present invention.
The main difference between this embodiment and embodiments 1 and 2 is the structure of the sealing device 2.
Sealing device 2 includes sealing washer 21 and sealed pushing away piece 22, sealing washer 21 sets up the opening of work piece 10 that awaits measuring, sealed pushing away piece 22 is used for the extrusion sealing washer 21 is so that sealing washer 21 seals the opening of work piece 10 that awaits measuring, specifically speaking, the front end lid that sealed pushing away piece 22 closed the opening of work piece 10 that awaits measuring. The shape of the sealing ring 21 is matched with the opening of the workpiece 10 to be measured, and the shape of the sealing ring 21 can be a circular ring shape, a polygon shape or an irregular shape. The sealing device 2 further comprises a sealing pulling piece 24, the sealing pulling piece 24 penetrates through the sealing pushing piece 22, the sealing ring 21 is arranged between the sealing pushing piece 22 and the sealing pulling piece 24, the sealing pulling piece 24 is provided with an air duct 23, and an output port of the inflating device 3 is communicated with the inside of the workpiece 10 to be tested through the air duct 23.
The working principle of the sealing device 2 is as follows: the sealing device 2 of the present embodiment mainly detects the workpiece 10 to be measured in which the opening of the workpiece 10 to be measured is higher than the surface of the workpiece 10 to be measured. Firstly, the sealing ring 21 is arranged on the sealing pushing piece 22 or the sealing pulling piece 24 in advance, the sealing pushing piece 22 and the sealing pulling piece 24 are placed in an opening of the workpiece 10 to be measured, and then the sealing pushing piece 22 and the sealing pulling piece 24 interact with each other, so that the sealing ring 21 is deformed under stress, the sealing ring 21 is made to be more attached to the inner surface of the opening, and the sealing performance of the opening is improved. Because the sealing ring 21 is sealed and attached to the opening of the workpiece 10 to be measured through extrusion deformation, the surface of the sealing ring 21 does not rub against the workpiece 10 to be measured or the sealing push piece 22, so that the outer surface of the sealing ring 21 is not easily damaged, and the service life of the sealing ring 21 is prolonged.
In this embodiment, the control device may control the seal pushing element 22 or the seal pulling element 24, as long as the seal pushing element 22 and the seal pulling element 24 can press the seal ring 21.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (9)

1. A leak detection apparatus for sealing, comprising:
the leakage detection box is provided with an accommodating space, and the accommodating space is used for placing a workpiece to be detected;
the sealing device is arranged in the accommodating cavity of the leakage detection box and comprises a sealing ring and a sealing pushing piece, the sealing ring is arranged at the opening of the workpiece to be detected, and the sealing pushing piece is used for extruding the sealing ring so as to enable the sealing ring to seal the opening of the workpiece to be detected;
the output port of the inflation device is communicated with the interior of the workpiece to be detected;
and the detection device is communicated with the inside of the leakage detection box and is used for detecting the gas in the leakage detection box.
2. The leak detection apparatus in accordance with claim 1, wherein:
the sealing pushing piece comprises a sealing pushing rod and a sealing table, the sealing table is arranged at the front end of the sealing rod, an annular groove is formed in the front end of the sealing table, the annular groove is matched with the sealing ring, an air duct is arranged on the sealing pushing piece, and an output port of the inflating device is communicated with the interior of the workpiece to be tested through the air duct.
3. The leak detection apparatus in accordance with claim 1, wherein:
the sealing device further comprises a sealing pulling piece, the sealing pulling piece is sleeved on the sealing pushing piece, the sealing ring is arranged between the sealing pushing piece and the sealing pulling piece, the sealing pushing piece is provided with an air duct, and an output port of the inflating device is communicated with the inside of the workpiece to be tested through the air duct.
4. The leak detection apparatus in accordance with claim 1, wherein:
the sealing device further comprises a sealing pulling piece, the sealing pulling piece penetrates through the sealing pushing piece, the sealing ring is arranged between the sealing pushing piece and the sealing pulling piece, the sealing pulling piece is provided with an air duct, and an output port of the inflating device is communicated with the inside of the workpiece to be tested through the air duct.
5. Sealing leak detection apparatus according to any one of claims 1 to 4, wherein:
the leak detection gas is halogen gas, helium gas or hydrogen gas.
6. The leak detection apparatus in accordance with claim 5, wherein:
the workpiece fixing device is arranged on the outer side of the workpiece to be detected and used for fixing the workpiece to be detected.
7. The leak detection apparatus in accordance with claim 5, further comprising:
the stress sensor is arranged on the sealing device and used for detecting the pressure applied to the sealing ring;
and the control device is respectively electrically connected with the sealing device and the stress sensor, and controls the sealing device to extrude the sealing ring according to the pressure applied to the sealing ring.
8. The leak detection apparatus in accordance with claim 5, further comprising:
the air release valve is arranged on the surface of the leakage detection box;
and the silencer is arranged at the output port of the air release valve.
9. The leak detection apparatus in accordance with claim 5, further comprising:
the vacuum pump is communicated with the interior of the leakage detection box;
the vacuum gauge is arranged on the surface of the leakage detection box and detects the vacuum degree of the leakage detection box.
CN202010845029.5A 2020-08-20 2020-08-20 Sealing leakage detection device Pending CN111912579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010845029.5A CN111912579A (en) 2020-08-20 2020-08-20 Sealing leakage detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010845029.5A CN111912579A (en) 2020-08-20 2020-08-20 Sealing leakage detection device

Publications (1)

Publication Number Publication Date
CN111912579A true CN111912579A (en) 2020-11-10

Family

ID=73278495

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010845029.5A Pending CN111912579A (en) 2020-08-20 2020-08-20 Sealing leakage detection device

Country Status (1)

Country Link
CN (1) CN111912579A (en)

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