CN113340542B - Hanging stove leakproofness detection device - Google Patents
Hanging stove leakproofness detection device Download PDFInfo
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- CN113340542B CN113340542B CN202110898895.5A CN202110898895A CN113340542B CN 113340542 B CN113340542 B CN 113340542B CN 202110898895 A CN202110898895 A CN 202110898895A CN 113340542 B CN113340542 B CN 113340542B
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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
- G01M3/28—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The invention is suitable for the technical field of wall-mounted furnace sealing performance detection equipment, and provides a wall-mounted furnace sealing performance detection device, which comprises: the rear end of the detector is provided with a detection port and an air outlet; the two groups of sealing assemblies respectively comprise sealing pipes, auxiliary nuts and adjusting nuts, the two sealing pipes are respectively communicated with the detection port and the gas outlet through hoses, threads are arranged on the outer sides of the sealing pipes, the auxiliary nuts are screwed to the front ends of the sealing pipes, and the adjusting nuts are screwed to the rear ends of the sealing pipes; the outside of sealed tube is cup jointed a sealed utricule, and the diameter grow can be under the effect that supplementary nut and adjusting nut extrude to inside to the sealed utricule. Therefore, the wall-mounted furnace sealing device has the advantages that the special sealing head is arranged to seal and plug pipelines with different diameters and pipelines of corrugated pipes in the wall-mounted furnace, the convenience of sealing detection of the detection equipment is improved, and the technical effects of simplicity in operation, reliability in detection and suitability for different types of pipelines are achieved.
Description
Technical Field
The invention relates to the technical field of wall-mounted furnace sealing performance detection devices, in particular to a wall-mounted furnace sealing performance detection device.
Background
Along with the improvement of living standard of people, residents have more and more extensive use of the wall-mounted furnace, the wall-mounted furnace is provided with two parts of a gas pipeline and a water pipeline, at present, the wall-mounted furnace has fewer devices for detecting the sealing property, but the detection of the wall-mounted boiler is very important, the gas leakage and the water pipeline leakage of the wall-mounted boiler can cause great potential safety hazard, and the diameters of the pipelines in the wall-mounted boiler are different, the pipeline is difficult to seal during detection, and meanwhile, the pipelines of part of the wall-hanging furnaces are corrugated pipes, this requires that the tightness detection means be able to adapt to variations in the diameter and type of the wall-hanging stove pipes in terms of sealing the pipes, therefore, it is very important to produce a device capable of sealing the changed pipeline of the wall-mounted furnace, so as to detect the sealing performance of the wall-mounted furnace and eliminate the potential safety hazard of the wall-mounted furnace in use.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a wall-hanging stove tightness detection device, which can implement tightness detection of air and water pipelines inside different wall-hanging stoves by using the same device through the arrangement of a sealing structure, and seal and block pipelines and corrugated pipes with different pipe diameters inside the wall-hanging stove by using a special sealing head, so that convenience and universality of detection of the detection device are increased, and technical effects of simple operation, reliable detection and suitability for different types of pipelines are achieved.
In order to achieve the above object, the present invention provides a wall-hanging stove sealing performance detection device, including: the rear end of the detector is provided with a detection port and an air outlet; the two groups of sealing assemblies respectively comprise sealing pipes, auxiliary nuts and adjusting nuts, the two sealing pipes are respectively communicated with the detection port and the gas outlet through hoses, threads are arranged on the outer sides of the sealing pipes, the auxiliary nuts are in threaded connection with the front ends of the sealing pipes, and the adjusting nuts are in threaded connection with the rear ends of the sealing pipes; the outer side of the sealing pipe is sleeved with a sealing bag body, a fluid medium is arranged in the sealing bag body, and the sealing bag body can expand outwards under the action of inward extrusion of the auxiliary nut and the adjusting nut.
According to the wall-mounted furnace sealing performance detection device, the sealing bag body is made of rubber materials, and one side, close to the auxiliary nut, of the sealing bag body is fixedly connected to the outer wall of the sealing pipe through the fixing ring.
According to the wall-hanging stove leakproofness detection device, a baffle used for limiting the shape of the sealing bag body is arranged on one side, close to the sealing bag body, of the auxiliary nut.
According to the wall-hanging stove leakproofness detection device, one side, far away from the auxiliary nut, of the sealing bag body is fixedly connected with the sliding plate, and the sliding plate is sleeved on the sealing pipe and can freely slide along the axis of the sealing pipe under the action of the adjusting nut.
According to the wall-mounted furnace sealing performance detection device, the sliding plate is provided with the fluid filling hole communicated with the inside of the sealing bag body, and the sealing screw is arranged inside the fluid filling hole.
According to the wall-hanging stove leakproofness detection device, the front end of the sealing pipe is provided with the conical opening.
According to the wall-mounted furnace sealing performance detection device, the display screen and the operation keys are arranged at the front end of the detector.
According to the wall-mounted furnace sealing performance detection device, the rear end of one sealing pipe is connected with the air outlet through an air outlet hose, and the rear end of the other sealing pipe is connected with the detection port through a detection hose.
The invention provides a wall-hanging stove leakproofness detection device, which comprises: the tail part of the detector is provided with a detection port and a gas outlet, the detection port and a pipeline to be detected form a closed space, the gas outlet provides the pressure of gas inside, the detection port detects the pressure change inside the closed space, and the tightness inside the space is detected; the sealing device comprises two sealing components, wherein each sealing component comprises a sealing pipe, an auxiliary nut and an adjusting nut, the outer side of each sealing pipe is provided with a thread, the thread is matched with the auxiliary nut and the adjusting nut, the auxiliary nut is in threaded connection with the front end of the sealing pipe, and the adjusting nut is in threaded connection with the rear end of the sealing pipe; the outside of sealed tube has cup jointed one and can carry out the sealed utricule that seals to the pipeline under supplementary nut and adjusting nut to inside extruded effect, the inside of sealed utricule is equipped with fluid medium, and the sealed utricule sets up between supplementary nut and adjusting nut, through adjusting the position of adjusting nut for supplementary nut, compresses the sealed utricule, and under the effect of compression, the sealed utricule expands to the outside, seals to the pipeline that needs to seal.
Drawings
FIG. 1 is a schematic perspective view of the present invention; FIG. 2 is an exploded view of the seal assembly of the present invention; FIG. 3 is a cross-sectional view of the seal assembly of the present invention in an inoperative condition; FIG. 4 is a cross-sectional view of the seal assembly of the present invention in an operational condition; FIG. 5 is an enlarged view of part A of the present invention; FIG. 6 is an enlarged view of part B of the present invention; FIG. 7 is a rear view of the monitor of the present invention; in the figure, 1-a detector, 2-a display screen, 3-an operation button, 4-a detection hose, 5-an air outlet hose, 6-a sealing component, 61-an adjusting nut, 62-a sealing pipe, 621-a fixing ring, 622-a sealing bag body, 623-a fluid medium, 624-an air inlet channel, 625-a sliding plate, 626-a fluid filling hole, 627-a conical port, 628-a thread, 63-an auxiliary nut, 631-a baffle, 7-a pipeline, 8-an air outlet and 9-a detection port.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1 and 7, the invention provides a device for detecting the sealing performance of a wall-mounted furnace, which comprises a detector 1 and two sealing assemblies 6, wherein the rear end of the detector 1 is provided with a detection port 9 and an air outlet 8, a pipeline 7 of the wall-mounted furnace comprises a gas pipeline and a water pipeline inside the wall-mounted furnace, the inlet and the outlet of a gas pipeline or the inlet and the outlet of a water pipeline inside the wall-hanging stove are respectively sealed by two groups of sealing components 6 connected with the detection port 9 and the air outlet 8 to form a closed space, the pressure is maintained after the air supply and pressurization are carried out in the closed space, the change of the pressure in the closed space is detected through the detection port 9, whether the sealing property of the closed space meets the requirement is obtained through the detected pressure change value, the front end of the detector 1 is provided with a display screen 2 and an operation key 3, which is convenient for operating and controlling the detector 1.
Referring to fig. 2 and 3, it is preferable that both of the sealing assemblies 6 of the present invention include a sealing tube 62, an auxiliary nut 63 and an adjusting nut 61, wherein the outer side of the sealing tube 62 is provided with threads, the auxiliary nut 63 is screwed to the front end of the sealing tube 62, and the adjusting nut 61 is screwed to the rear end of the sealing tube 62; the outer side of the sealing tube 62 between the adjusting nut 61 and the auxiliary nut 63 is sleeved with a sealing bag body 622 capable of sealing the pipeline 7 under the action of inward extrusion of the auxiliary nut 63 and the adjusting nut 61, the sealing bag body 622 is made of rubber materials, the rubber is soft and more beneficial to sealing, a fluid medium 623 is arranged inside the sealing bag body 622, the sealing bag body 622 is arranged between the auxiliary nut 63 and the adjusting nut 61, the sealing bag body 622 is compressed by adjusting the position of the adjusting nut 61 relative to the auxiliary nut 63, and under the action of compression, the sealing bag body 622 expands outwards to be in contact with the inner wall of the pipeline 7 so as to seal the pipeline 7 needing to be sealed.
Referring to fig. 2 and 4, in addition, one end of the sealed capsule 622 of the present invention, which is close to the auxiliary nut 63, is fixedly connected to the outer wall of the sealed tube 62 through a fixing ring 621, one side of the sealed capsule 622, which is far away from the auxiliary nut 63, is fixedly connected with a sliding plate 625, the sliding plate 625 is sleeved on the sealed tube 62 and can freely slide along the axis of the sealed tube 62, by fixing one end of the sealed capsule 622, it is ensured that when the sliding plate 625 slides on the sealed tube 62, when the sliding plate 625 pulls the sealed capsule 622, the diameter of the sealed capsule 622 becomes smaller, so as to be inserted into the interior of the pipeline 7 to be sealed, and then the pipeline 7 is sealed, when the sliding plate 625 compresses the sealed capsule 622 towards the interior, because the sealed capsule 622 is always in a closed state, under the pressure of the internal fluid medium 623, the sealed capsule 622 becomes smaller in length but the diameter increases through the auxiliary nut 63 and the adjusting nut 61 compressing inward, the phenomenon of contact extrusion with the inner wall of the pipeline 7 occurs, and the sealing effect is achieved through extrusion.
Referring to fig. 3 and 4, further, a baffle 631 is disposed on a side of the auxiliary nut 63 adjacent to the capsule 622, an outer diameter of the baffle 631 is slightly smaller than an inner diameter of the pipeline 7 to be sealed, by disposing the baffle 631, and a diameter of the baffle 631 is slightly smaller than an inner diameter of the pipeline 7, when sealing is performed on pipelines 7 with different diameters, the auxiliary nut 63 with different sizes of the baffle 631 is replaced, so that a phenomenon that the outer diameter of the baffle 631 is greatly different from the inner diameter of the pipeline 7, and thus the capsule 622 is partially extruded and deformed from a gap between the baffle 631 and the pipeline 7 after the capsule 622 is compressed, and the pipeline 7 cannot be sealed is prevented, before the capsule 622 is compressed by sliding of the sliding plate 625, the auxiliary nut 63 is mounted at a position where the capsule 622 is fixed with an outer wall of the pipeline 7, and when compressed, the capsule 622 is in contact with the baffle 631, and the capsule 622 is tightly attached to the baffle 631, slightly less than pipeline 7's internal diameter with the diameter setting of baffle 631, prevent when the compression, sealed utricule 622 is extruded from both inside clearances, when leading to the sealed utricule 622 of compression, can't seal, slide 625's diameter is greater than pipeline 7's external diameter simultaneously, prevent to enter into pipeline 7's inside when slide 625 is gliding, also play the effect that blocks to sealed utricule 622 simultaneously, extrude when preventing the compression of sealed utricule 622, can't form sealed effect to pipeline 7's inner wall, after sealed finishing, under the effect of the elasticity of self through sealed utricule 622, reset slide 625.
Referring to fig. 3, 4 and 6, preferably, the sliding plate 625 of the present invention is provided with a fluid filling hole 626 communicated with the inside of the sealed capsule 622, the fluid filling hole 626 is internally provided with a sealing screw, a fluid medium 623 is filled into the sealed capsule 622 through the fluid filling hole 626, the sealing screw is provided for sealing the fluid filling hole 626, a closed space is formed inside the sealed capsule 622, the fluid filling hole 626 is provided for filling the fluid medium 623 into the sealed capsule 622 in the subsequent use, the fluid medium 623 inside the sealed capsule 622 is prevented from being small and not beneficial to extending into the pipeline 7 for sealing, and in order to ensure the fluidity and the variable shape property of the substance inside the sealed capsule 622, the fluid medium 623 such as air, water, oil, non-newtonian fluid and the like is used inside the sealed capsule 622, the present invention is preferably oil and non-newtonian fluid, when the adjusting nut 61 moves towards the auxiliary nut 63, the sliding plate 625 is pushed to be extruded, the diameter of the sealing bag body 622 is increased under the action of the flowing of the fluid medium 623, and the outer wall of the sealing bag body 622 is in close contact with the inner wall of the pipeline 7 to be sealed.
Referring to fig. 1, 3 and 7, further, the front end of the sealing tube 62 of the present invention is provided with a tapered opening 627 communicated with the air inlet passage 624 inside the sealing tube 62, so that the installation of the sealing assembly 6 and the injection of air are facilitated, wherein the rear end of one sealing tube 62 is connected with the air outlet 8 through an air outlet hose 5, the rear end of the other sealing tube 62 is connected with the detection port 9 through a detection hose 4, and the hoses are provided for facilitating the position adjustment of the sealing assembly 6 during use.
In this example, referring to fig. 1, 3, 4 and 7, before the present invention is used, the baffle 631 is compared with the inner diameter of the pipeline 7 to be sealed, the corresponding auxiliary nut 63 is replaced, it is ensured that the diameter of the baffle 631 on the auxiliary nut 63 is slightly smaller than the inner diameter of the pipeline 7 and is screwed to the position of the fixing ring 621 of the sealing capsule 622, so as to facilitate subsequent sealing, then one of the sealing assemblies 6 is inserted into the inlet of the gas pipeline of the wall-hanging stove to be measured, the other sealing assembly 6 is inserted into the outlet of the gas pipeline of the wall-hanging stove to be measured or one of the sealing assemblies 6 is inserted into the inlet of the waterway pipeline of the wall-hanging stove to be measured, the other sealing assembly 6 is inserted into the outlet of the waterway pipeline of the wall-hanging stove to be measured, so that a sealed space is formed, by adjusting the adjusting nut 61, the adjusting nut 61 pushes the sliding plate 625 to slide, the distance between the sliding plate 625 and the baffle 631 is reduced, the sealing bag body 622 expands outwards under the action of the fluid medium 623 in the sealing bag body 622, when the outer side of the sealing bag body 622 contacts the inner wall of the pipeline, the distance between the sliding plate 625 and the baffle 631 is reduced, the pressure between the sealing bag body 622 and the inner wall of the pipeline 7 is increased, the sealing effect is improved, when the sealed pipeline 7 is a corrugated pipe, the outer wall of the sealing bag body 622 fits the shape of the inner wall of the corrugated pipe under the extrusion effect of the sealing bag body 622, the corrugated shape which fits the corrugated pipe is formed on the surface of the sealing bag body 622, which contacts with the inner wall of the pipeline 7 of the corrugated pipe, the area of the sealing plane between the corrugated pipe and the sealing bag body 622 is increased, the sealing effect of the corrugated pipe is ensured, after the inlet and the outlet of the gas pipeline of the wall-hanging stove which need to be measured or the inlet and the outlet of the water pipeline of the wall-hanging water way stove are sealed, gas is injected into the measured passage through the tapered port 627 on one side of the gas outlet hose 5, the pressure change of the air inside the passage is detected through the communication between the tapered port 627 and one side of the detection port 9, when the pressure of the gas reaches the preset pressure, the gas is cut off and the pressure is maintained, and the tightness of a gas pipeline or a water pipeline of the wall-hanging stove to be measured is determined through the measured value of the pressure change.
In summary, the present invention provides a wall-hanging stove tightness detection device, including: the tail part of the detector is provided with a detection port and a gas outlet, the detection port and a pipeline to be detected form a closed space, the gas outlet provides the pressure of gas inside, the detection port detects the pressure change inside the closed space, and the tightness inside the space is detected; the sealing device comprises two sealing components, wherein each sealing component comprises a sealing pipe, an auxiliary nut and an adjusting nut, the outer side of each sealing pipe is provided with a thread, the thread is matched with the auxiliary nut and the adjusting nut, the auxiliary nut is in threaded connection with the front end of the sealing pipe, and the adjusting nut is in threaded connection with the rear end of the sealing pipe; the outside of sealed tube has cup jointed one and can carry out the sealed utricule that seals to the pipeline under supplementary nut and adjusting nut to inside extruded effect, the inside of sealed utricule is equipped with fluid medium, and the sealed utricule sets up between supplementary nut and adjusting nut, through adjusting the position of adjusting nut for supplementary nut, compresses the sealed utricule, and under the effect of compression, the sealed utricule expands to the outside, seals to the pipeline that needs to seal.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Claims (6)
1. The utility model provides a hanging stove leakproofness detection device which characterized in that includes:
the rear end of the detector is provided with a detection port and an air outlet;
the two groups of sealing assemblies respectively comprise sealing pipes, auxiliary nuts and adjusting nuts, the two sealing pipes are respectively communicated with the detection port and the gas outlet, threads are arranged on the outer sides of the sealing pipes, the auxiliary nuts are in threaded connection with the front ends of the sealing pipes, and the adjusting nuts are in threaded connection with the rear ends of the sealing pipes;
a sealing bag body is sleeved on the outer side of the sealing pipe and arranged between the auxiliary nut and the adjusting nut, the sealing bag body is internally provided with a fluid medium, the sealing bag body can expand outwards under the action of inward extrusion of the auxiliary nut and the adjusting nut, one side of the sealing bag body close to the auxiliary nut is fixedly connected with the outer wall of the sealing tube through a fixing ring, a baffle plate for limiting the shape of the sealing bag body is arranged on one side of the auxiliary nut close to the sealing bag body, one end of the sealing bag body, which is far away from the auxiliary nut, is fixedly connected with a sliding plate which is sleeved on the sealing pipe and can freely slide along the axis of the sealing pipe under the action of the adjusting nut, the diameter of the baffle is slightly less than the internal diameter of the pipeline to be sealed, and the diameter of the sliding plate is greater than the external diameter of the pipeline to be sealed.
2. The wall-hanging stove leakproofness detecting device of claim 1, wherein the sealing bag body is made of a rubber material.
3. The wall-hanging stove leakproofness detection device of claim 1, characterized in that a fluid filling hole is formed in the sliding plate and communicated with the inside of the sealing bag body, and a sealing screw is arranged inside the fluid filling hole.
4. The wall-hanging stove leakproofness detecting device of claim 1, characterized in that a tapered opening is formed in the front end of the sealing pipe.
5. The wall-hanging stove leakproofness detection device according to claim 1, characterized in that a display screen and operation keys are arranged at the front end of the detector.
6. The device for detecting the sealing performance of the wall-hanging stove according to claim 1, wherein a rear end of one of the sealing pipes is connected to the air outlet through an air outlet hose, and a rear end of the other sealing pipe is connected to the detection port through a detection hose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898895.5A CN113340542B (en) | 2021-08-06 | 2021-08-06 | Hanging stove leakproofness detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898895.5A CN113340542B (en) | 2021-08-06 | 2021-08-06 | Hanging stove leakproofness detection device |
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| Publication Number | Publication Date |
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| CN113340542A CN113340542A (en) | 2021-09-03 |
| CN113340542B true CN113340542B (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110898895.5A Active CN113340542B (en) | 2021-08-06 | 2021-08-06 | Hanging stove leakproofness detection device |
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Families Citing this family (1)
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| CN114414151B (en) * | 2022-01-19 | 2023-06-27 | 成都秦川物联网科技股份有限公司 | Synchronous operation formula energy metering device with built-in gateway and thing networking system |
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| CN203249740U (en) * | 2013-04-01 | 2013-10-23 | 广州市上腾电子科技有限公司 | Wall hanging stove combustion chamber gas tightness testing system |
| CN203963376U (en) * | 2014-07-17 | 2014-11-26 | 宁海开泰管业科技有限公司 | Body with gas leak detection device |
| CN105067195A (en) * | 2015-09-14 | 2015-11-18 | 中船黄埔文冲船舶有限公司 | Pipeline water filling test sealing isolation device and application method thereof |
| CN205402082U (en) * | 2016-03-08 | 2016-07-27 | 王大功 | Natural gas line plugging device |
| CN106226007A (en) * | 2016-08-02 | 2016-12-14 | 南京化工特种设备检验检测研究所 | Pipe end pressure-detecting device |
| CN108758157A (en) * | 2018-08-10 | 2018-11-06 | 李志海 | A kind of pipeline with pressure leak stoppage device |
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2021
- 2021-08-06 CN CN202110898895.5A patent/CN113340542B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203249740U (en) * | 2013-04-01 | 2013-10-23 | 广州市上腾电子科技有限公司 | Wall hanging stove combustion chamber gas tightness testing system |
| CN203963376U (en) * | 2014-07-17 | 2014-11-26 | 宁海开泰管业科技有限公司 | Body with gas leak detection device |
| CN105067195A (en) * | 2015-09-14 | 2015-11-18 | 中船黄埔文冲船舶有限公司 | Pipeline water filling test sealing isolation device and application method thereof |
| CN205402082U (en) * | 2016-03-08 | 2016-07-27 | 王大功 | Natural gas line plugging device |
| CN106226007A (en) * | 2016-08-02 | 2016-12-14 | 南京化工特种设备检验检测研究所 | Pipe end pressure-detecting device |
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