CN111120878A - Pipeline air tightness detection device - Google Patents
Pipeline air tightness detection device Download PDFInfo
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- CN111120878A CN111120878A CN202010097729.0A CN202010097729A CN111120878A CN 111120878 A CN111120878 A CN 111120878A CN 202010097729 A CN202010097729 A CN 202010097729A CN 111120878 A CN111120878 A CN 111120878A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
Abstract
The invention discloses a pipeline air tightness detection device, which relates to the technical field of pipeline detection equipment and at least comprises a main body and two inflatable sealing rings, wherein two sealing ring accommodating grooves are circumferentially and annularly arranged on the outer wall of the main body; a pressurizing test hole is formed in the side wall of the main body; the gas circuit holding chamber is communicated with the external atmospheric pressure, a test gas circuit is arranged in the gas circuit holding chamber, and the test gas circuit comprises a sealing ring inflation opening and closing cylinder for inflating and pressurizing the sealing ring pressurizing chamber and a test pressurization opening and closing cylinder for inflating and pressurizing the test pressurizing chamber. The invention provides a pipeline air tightness detection device which is high in efficiency and precision and can not damage a pipe fitting.
Description
Technical Field
The invention relates to the technical field of pipeline detection equipment, in particular to a pipeline air tightness detection device.
Background
In the oil pipe network, gas pipe network or water conservancy pipe network work progress, because single pipe fitting length is limited, in order to realize that the fluid transports far away, often need be used for increasing the length of pipeline with many pipe fittings end to end. However, in the process of butting the pipes, the possibility of leakage of the pipes at the butting position is caused by improper operation of operators or the influence of factors such as the surrounding environment, and therefore, after the pipes are butted, the airtightness detection is required.
The existing pipeline air tightness detection method is generally to seal the head end and the tail end of a butted pipeline, inflate and pressurize an inner cavity, and observe whether leakage exists at the butted position. The detection method has the advantages of low efficiency and poor precision, and the plugging mechanism fixed at the end of the pipe fitting is easy to scratch and damage the end part of the pipe fitting.
Disclosure of Invention
In order to solve the problems, the invention provides a pipeline air-tightness detection device which is high in efficiency and precision and can not damage a pipe fitting.
In order to achieve the purpose, the invention adopts the following technical scheme: a pipeline air tightness detection device at least comprises a main body and two inflatable sealing rings, wherein the main body is tubular, two sealing ring accommodating grooves are circumferentially and annularly arranged on the outer wall of the main body, the two inflatable sealing rings correspond to the two sealing ring accommodating grooves one by one, the inflatable sealing rings are sleeved in the corresponding sealing ring accommodating grooves, the two inflatable sealing rings are arranged at intervals in parallel, an inner cavity of the main body is divided into a sealing ring pressurizing cavity, a test pressurizing cavity and an air path accommodating cavity through a partition plate, and the two inflatable sealing rings are communicated with the sealing ring pressurizing cavities; a pressurizing test hole is formed in the side wall of the main body, an external opening of the pressurizing test hole is positioned between the two inflatable sealing rings, and an internal opening of the pressurizing test hole is communicated with the test pressurizing cavity; the gas circuit holding chamber is communicated with the external atmospheric pressure, a test gas circuit is arranged in the gas circuit holding chamber, and the test gas circuit comprises a sealing ring inflation opening and closing cylinder for inflating and pressurizing the sealing ring pressurizing chamber and a test pressurization opening and closing cylinder for inflating and pressurizing the test pressurizing chamber.
Preferably, the sealing ring inflation starting and stopping cylinder comprises a first cylinder body, the first cylinder body is tubular, a first upper sealing plate is arranged on an upper port of the first cylinder body, a first connecting port is formed in the first upper sealing plate, and the first connecting port is connected with the test pressurizing cavity through an air pipe; a first lower sealing plate is arranged on a lower port of the first cylinder body, a first air pressure balancing port is formed in the first lower sealing plate, and the first air pressure balancing port is communicated with external atmospheric pressure; a first air inlet and a first air outlet are formed in the side wall of the first cylinder body, an external opening of the first air inlet is connected with an external air source through an air pipe, and an external opening of the first air outlet is connected with the sealing ring pressurizing cavity through the air pipe; the first piston a, the first piston b, the first piston c and the first spring are sequentially arranged in the first cylinder body from top to bottom, the first piston a, the first piston b and the first piston c are relatively fixed through a first connecting rod, the first piston a, the first piston b and the first piston c are in sliding sealing fit with the inner wall of the first cylinder body, and the first piston a, the first piston b, the first piston c and the first connecting rod can synchronously move up and down in the first cylinder body; the upper end of the first spring is abutted against the bottom of the first piston c, and the lower end of the first spring is abutted against the top of the first lower sealing plate;
when the first piston a, the first piston b, the first piston c and the first connecting rod are located at the highest limit position in the first cylinder body, the first air inlet and the first air outlet are located between the first piston b and the first piston c, namely the first air inlet and the first air outlet are communicated; when the first piston a, the first piston b, the first piston c and the first connecting rod are located at the lowest limit position in the first cylinder body, the first air inlet is located between the first piston b and the first piston c, and the first air outlet is located between the first piston a and the first piston b, namely, the communication between the first air inlet and the first air outlet is cut off by the first piston b;
the test pressurizing start-stop cylinder comprises a second cylinder body, the second cylinder body is tubular, a second upper sealing plate is arranged on an upper port of the second cylinder body, a second connecting port is formed in the second upper sealing plate, and the second connecting port is connected with the sealing ring pressurizing cavity through an air pipe; a second lower sealing plate is arranged on a lower port of the second cylinder body, a second air pressure balancing port is formed in the second lower sealing plate, and the second air pressure balancing port is communicated with external atmospheric pressure; a second air inlet and a second air outlet are formed in the side wall of the second cylinder body, an external opening of the second air inlet is connected with an external air source through an air pipe, and an external opening of the second air outlet is connected with the test pressurizing cavity through the air pipe; a second piston a, a second piston b, a second piston c and a second spring are sequentially arranged in the second cylinder body from top to bottom, the second piston a, the second piston b and the second piston c are relatively fixed through a second connecting rod, the second piston a, the second piston b and the second piston c are in sliding sealing fit with the inner wall of the second cylinder body, and the second piston a, the second piston b, the second piston c and the second connecting rod can synchronously move up and down in the second cylinder body; the upper end of the second spring is abutted against the bottom of the second piston c, and the lower end of the second spring is abutted against the top of the second lower sealing plate;
when the second piston a, the second piston b, the second piston c and the second connecting rod are located at the highest limit position in the second cylinder body, the second air inlet is located between the second piston a and the second piston b, and the second air outlet is located between the second piston b and the second piston c, namely, the communication between the second air inlet and the second air outlet is cut off by the second piston b; when the second piston a, the second piston b, the second piston c and the second connecting rod are located at the lowest limit position in the second cylinder body, the second air inlet and the second air outlet are located between the second piston a and the second piston b, namely the second air inlet and the second air outlet are communicated.
Preferably, a stop valve is arranged on an air pipe connecting an external opening of the second air inlet with an external air source.
Therefore, the invention has the following beneficial effects: 1. the sealing is realized by inflating and expanding the inflatable sealing ring, so that the pipe fitting is not damaged; 2. by arranging the sealing ring inflation starting and stopping air cylinder and the test pressurization starting and stopping air cylinder, an inflation air path of the inflation sealing ring can be automatically cut off after the inflation and sealing of the inflation sealing ring are finished, so that the inflation sealing ring is more stably sealed in the test process; 3. the structure is simple, the processing cost is low, and the linkage between the structures is strong.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the gas circuit of the present invention.
Fig. 3 is a schematic diagram of the structure of the test tube.
FIG. 4 is a schematic diagram of the structure of the present invention during testing.
Fig. 5 is a schematic diagram of the gas circuit before testing of the present invention.
Fig. 6 is a schematic diagram of the gas path of the inflatable sealing ring just after the inflation in the invention.
Fig. 7 is a schematic diagram of the gas circuit in the test of the present invention.
1: a main body; 101: a seal ring pressurization cavity; 102: testing the pressurized chamber; 103: a gas path accommodating cavity; 2: an inflatable seal ring; 3: a partition plate; 4: pressurizing the test hole; 5: the sealing ring is inflated to open and close the cylinder; 501: a first cylinder; 502: a first upper sealing plate; 503: a first connection port; 504: a first lower sealing plate; 505: a first air pressure balance port; 506: a first air inlet; 507: a first air outlet; 508: a first piston a; 509: a first piston b; 510: a first piston c; 511: a first spring; 512: a first link; 6: testing a pressurized opening and closing cylinder; 601: a second cylinder; 602: a second upper sealing plate; 603: a second connection port; 604: a second lower sealing plate; 605: a second air pressure balancing port; 606: a second air inlet; 607: a second air outlet; 608: a second piston a; 609: a second piston b; 610: a second piston c; 611: a second spring; 612: a second link; 7: an external gas source; 8: a stop valve; 9: a pipeline to be tested; 901: and (6) butting the pipelines.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
A pipeline air tightness detection device, see fig. 1 to 7, at least comprises a main body 1 and two inflatable sealing rings 2, wherein the main body 1 is tubular, two sealing ring accommodating grooves are circumferentially and annularly arranged on the outer wall of the main body 1, the two inflatable sealing rings 2 correspond to the two sealing ring accommodating grooves one by one, the inflatable sealing rings 2 are sleeved in the corresponding sealing ring accommodating grooves, the two inflatable sealing rings 2 are arranged in parallel at intervals, an inner cavity of the main body 1 is divided into a sealing ring pressurizing cavity 101, a test pressurizing cavity 102 and an air path accommodating cavity 103 through a partition plate 3, and the two inflatable sealing rings 2 are both communicated with the sealing ring pressurizing cavity 101; a pressurizing test hole 4 is formed in the side wall of the main body 1, the external opening of the pressurizing test hole 4 is positioned between the two inflatable sealing rings 2, and the internal opening is communicated with the test pressurizing cavity 102; the gas circuit accommodating cavity 103 is communicated with external atmospheric pressure, a test gas circuit is arranged in the gas circuit accommodating cavity 103, and the test gas circuit comprises a sealing ring inflation opening and closing cylinder 5 for inflating and pressurizing the sealing ring pressurizing cavity 101 and a test pressurization opening and closing cylinder 6 for inflating and pressurizing the test pressurizing cavity 102.
The sealing ring inflation starting and stopping cylinder 5 comprises a first cylinder body 501, the first cylinder body 501 is tubular, a first upper sealing plate 502 is arranged on an upper port of the first cylinder body 501, a first connecting port 503 is formed in the first upper sealing plate 502, and the first connecting port 503 is connected with the test pressurizing cavity 102 through an air pipe; a first lower sealing plate 504 is arranged on a lower port of the first cylinder body 501, a first air pressure balancing port 505 is formed in the first lower sealing plate 504, and the first air pressure balancing port 505 is communicated with external atmospheric pressure; a first air inlet 506 and a first air outlet 507 are formed in the side wall of the first cylinder body 501, an external opening of the first air inlet 506 is connected with an external air source 7 through an air pipe, and an external opening of the first air outlet 507 is connected with the sealing ring pressurizing cavity 101 through an air pipe; a first piston a508, a first piston b509, a first piston c510 and a first spring 511 are sequentially arranged in the first cylinder 501 from top to bottom, the first piston a508, the first piston b509 and the first piston c510 are relatively fixed through a first connecting rod 512, the first piston a508, the first piston b509 and the first piston c510 are in sliding seal fit with the inner wall of the first cylinder 501, and the first piston a508, the first piston b509, the first piston c510 and the first connecting rod 512 can synchronously move up and down in the first cylinder 501; the upper end of the first spring 511 abuts against the bottom of the first piston c510, and the lower end abuts against the top of the first lower closure plate 504.
When the first piston a508, the first piston b509, the first piston c510 and the first connecting rod 512 are located at the highest limit position in the first cylinder 501, the first air inlet 506 and the first air outlet 507 are both located between the first piston b509 and the first piston c510, that is, the first air inlet 506 and the first air outlet 507 are communicated; when the first piston a508, the first piston b509, the first piston c510 and the first link 512 are located at the lowest limit position in the first cylinder 501, the first air inlet port 506 is located between the first piston b509 and the first piston c510, and the first air outlet port 507 is located between the first piston a508 and the first piston b509, that is, the communication between the first air inlet port 506 and the first air outlet port 507 is cut off by the first piston b 509.
The test pressurizing start-stop cylinder 6 comprises a second cylinder body 601, the second cylinder body 601 is tubular, a second upper sealing plate 602 is arranged on an upper port of the second cylinder body 601, a second connecting port 603 is formed in the second upper sealing plate 602, and the second connecting port 603 is connected with the sealing ring pressurizing cavity 101 through an air pipe; a second lower sealing plate 604 is arranged on a lower port of the second cylinder 601, a second air pressure balancing port 605 is arranged on the second lower sealing plate 604, and the second air pressure balancing port 605 is communicated with external atmospheric pressure; a second air inlet 606 and a second air outlet 607 are arranged on the side wall of the second cylinder 601, the external opening of the second air inlet 606 is connected with an external air source 7 through an air pipe, a stop valve 8 is arranged on the air pipe connecting the external opening of the second air inlet 606 with the external air source 7, and the external opening of the second air outlet 607 is connected with the test pressurizing cavity 102 through an air pipe; a second piston a608, a second piston b609, a second piston c610 and a second spring 611 are sequentially arranged in the second cylinder 601 from top to bottom, the second piston a608, the second piston b609 and the second piston c610 are relatively fixed through a second connecting rod 612, the second piston a608, the second piston b609 and the second piston c610 are in sliding sealing fit with the inner wall of the second cylinder 601, and the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 can synchronously move up and down in the second cylinder 601; the upper end of the second spring 611 abuts against the bottom of the second piston c610, and the lower end abuts against the top of the second lower sealing plate 604.
When the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 are located at the highest limit position in the second cylinder 601, the second air inlet 606 is located between the second piston a608 and the second piston b609, and the second air outlet 607 is located between the second piston b609 and the second piston c610, that is, the communication between the second air inlet 606 and the second air outlet 607 is cut off by the second piston b 609; when the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 are located at the lowest limit position in the second cylinder 601, the second air inlet port 606 and the second air outlet port 607 are both located between the second piston a608 and the second piston b609, that is, the second air inlet port 606 and the second air outlet port 607 communicate.
When the device is used for detecting a pipeline, the main body 1 firstly extends into the pipeline to be detected from one end port of the pipeline 9 and moves to the pipeline butt joint 901, so that the two inflatable sealing rings 2 on the main body 1 are positioned at two sides of the pipeline butt joint 901, as shown in fig. 4. And opening an external air source 7, and inflating and pressurizing a first air inlet 506 of the seal ring inflation start-stop air cylinder 5 and a second air inlet 606 of the test pressurization start-stop air cylinder 6.
In an initial state, the sealing ring is inflated to open and close the cylinder 5, the first piston a508, the first piston b509, the first piston c510 and the first connecting rod 512 are acted by the first spring 511 and located at the highest limit position in the first cylinder 501, and the first air inlet 506 and the first air outlet 507 are located between the first piston b509 and the first piston c510, namely the first air inlet 506 and the first air outlet 507 are communicated; in the test pressurizing start-stop cylinder 6, the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 are acted by the second piston c610 and located at the highest limit position in the second cylinder 601, the second air inlet 606 is located between the second piston a608 and the second piston b609, the second air outlet 607 is located between the second piston b609 and the second piston c610, namely, the communication between the second air inlet 606 and the second air outlet 607 is cut off by the second piston b609, as shown in fig. 5. Therefore, the end of the external air source 7 connected with the second air inlet 606 is cut off, the external air source 7 can sequentially pass through the first air inlet 506 and the first air outlet 507 to inflate and pressurize the sealing ring pressurizing cavity 101, the pressure in the sealing ring pressurizing cavity 101 is increased, so that the two inflatable sealing rings 2 communicated with the sealing ring pressurizing cavity 101 are inflated and expanded, and are attached to the inner wall of the pipeline 9 to be measured, and sealing is achieved. At the moment, the two inflatable sealing rings 2 isolate the gap between the inner wall of the pipeline 9 to be tested and the outer wall of the main body 1 into a sealed cavity, and the pipeline butt joint part 901 and the pressurization test hole 4 are communicated with the sealed cavity.
After the two inflatable sealing rings 2 are inflated and expanded to be attached and sealed with the inner wall of the pipeline 9 to be tested, along with the continuous increase of the pressure in the sealing ring pressurizing cavity 101, the air pressure in the sealing ring pressurizing cavity 101 enters the test pressurizing opening and closing cylinder 6 through the second connecting port 603, and further pushes the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 to move downwards and compress the second spring 611. When the second piston a608, the second piston b609, the second piston c610 and the second connecting rod 612 move down to the lowest limit position, the second air inlet port 606 and the second air outlet port 607 are both located between the second piston a608 and the second piston b609, i.e., the second air inlet port 606 and the second air outlet port 607 are communicated with each other, as shown in fig. 6. At this time, the external air source 7 may sequentially pass through the second air inlet 606 and the second air outlet 607 to inflate and pressurize the test pressurizing cavity 102, the test pressurizing cavity 102 may deliver air pressure into the sealed cavity between the two inflatable sealing rings 2 through the pressurization test hole 4, the air pressure is the test air pressure, and the operator only needs to observe whether there is air leakage outside the pipe butt joint 901 of the pipe 9 to be tested, and can determine whether the pipe butt joint 901 is qualified.
When the pressure in the test pressure chamber 102 continues to increase, the air pressure in the test pressure chamber 102 enters the sealing ring through the first connection port 503 to inflate the on-off cylinder 5, so as to push the first piston a508, the first piston b509, the first piston c510 and the first link 512 to move down and compress the first spring 511. When the first piston a508, the first piston b509, the first piston c510 and the first link 512 are located at the lowest limit position in the first cylinder 501, the first air inlet 506 is located between the first piston b509 and the first piston c510, and the first air outlet 507 is located between the first piston a508 and the first piston b509, that is, the communication between the first air inlet 506 and the first air outlet 507 is cut off by the first piston b509, as shown in fig. 7. At this moment, cut off the intercommunication between outside air supply 7 and the sealing washer pressurization chamber 101, cut off the intercommunication between outside air supply 7 and two inflatable seal circle 2 promptly, like this, two inflatable seal circle 2 just can not receive the unstable influence of outside air supply 7, can seal the pipeline 9 inner wall that awaits measuring more steadily, and then ensure that the testing result is more accurate.
Meanwhile, when long-time pressure maintaining test is required, the stop valve 8 is closed only after the air pressure is stable in the detection process. At the moment, even if an external air source 7 is removed, the sealing ring air inflation opening and closing cylinder 5 and the test pressurization opening and closing cylinder 6 can be in an interlocking state, the sealing of the two air inflation sealing rings 2 and the test air pressure in the sealing cavity between the two air inflation sealing rings 2 can be continuously kept, and therefore the pressure maintaining test for a long time is carried out.
Claims (3)
1. A pipeline air tightness detection device is characterized in that: the device is characterized by at least comprising a main body (1) and two inflatable sealing rings (2), wherein the main body (1) is tubular, two sealing ring accommodating grooves are circumferentially and annularly arranged on the outer wall of the main body (1), the two inflatable sealing rings (2) correspond to the two sealing ring accommodating grooves one by one, the inflatable sealing rings (2) are sleeved in the corresponding sealing ring accommodating grooves, the two inflatable sealing rings (2) are arranged in parallel at intervals, the inner cavity of the main body (1) is divided into a sealing ring pressurizing cavity (101), a test pressurizing cavity (102) and a gas circuit accommodating cavity (103) through a partition plate (3), and the two inflatable sealing rings (2) are communicated with the sealing ring pressurizing cavity (101); a pressurizing test hole (4) is formed in the side wall of the main body (1), an external opening of the pressurizing test hole (4) is positioned between the two inflatable sealing rings (2), and an internal opening is communicated with the test pressurizing cavity (102); the gas circuit holding cavity (103) is communicated with external atmospheric pressure, a test gas circuit is arranged in the gas circuit holding cavity (103), and the test gas circuit comprises a sealing ring inflation opening and closing cylinder (5) for inflating and pressurizing the sealing ring pressurizing cavity (101) and a test pressurization opening and closing cylinder (6) for inflating and pressurizing the test pressurizing cavity (102).
2. The pipe airtightness detection apparatus according to claim 1, wherein: the sealing ring inflation starting and stopping air cylinder (5) comprises a first cylinder body (501), the first cylinder body (501) is tubular, a first upper sealing plate (502) is arranged on an upper port of the first cylinder body (501), a first connecting port (503) is formed in the first upper sealing plate (502), and the first connecting port (503) is connected with the test pressurizing cavity (102) through an air pipe; a first lower sealing plate (504) is arranged on a lower port of the first cylinder body (501), a first air pressure balancing port (505) is formed in the first lower sealing plate (504), and the first air pressure balancing port (505) is communicated with external atmospheric pressure; a first air inlet (506) and a first air outlet (507) are formed in the side wall of the first cylinder body (501), an external opening of the first air inlet (506) is connected with an external air source (7) through an air pipe, and an external opening of the first air outlet (507) is connected with the sealing ring pressurizing cavity (101) through an air pipe; a first piston a (508), a first piston b (509), a first piston c (510) and a first spring (511) are sequentially arranged in the first cylinder body (501) from top to bottom, the first piston a (508), the first piston b (509) and the first piston c (510) are relatively fixed through a first connecting rod (512), the first piston a (508), the first piston b (509) and the first piston c (510) are in sliding sealing fit with the inner wall of the first cylinder body (501), and the first piston a (508), the first piston b (509), the first piston c (510) and the first connecting rod (512) can synchronously move up and down in the first cylinder body (501); the upper end of the first spring (511) is abutted against the bottom of the first piston c (510), and the lower end of the first spring is abutted against the top of the first lower sealing plate (504);
when the first piston a (508), the first piston b (509), the first piston c (510) and the first connecting rod (512) are located at the highest limit position in the first cylinder body (501), the first air inlet (506) and the first air outlet (507) are located between the first piston b (509) and the first piston c (510), namely the first air inlet (506) and the first air outlet (507) are communicated; when the first piston a (508), the first piston b (509), the first piston c (510) and the first connecting rod (512) are located at the lowest limit position in the first cylinder body (501), the first air inlet (506) is located between the first piston b (509) and the first piston c (510), and the first air outlet (507) is located between the first piston a (508) and the first piston b (509), namely, the communication between the first air inlet (506) and the first air outlet (507) is cut off by the first piston b (509);
the test pressurizing start-stop cylinder (6) comprises a second cylinder body (601), the second cylinder body (601) is tubular, a second upper sealing plate (602) is arranged on an upper port of the second cylinder body (601), a second connecting port (603) is formed in the second upper sealing plate (602), and the second connecting port (603) is connected with the sealing ring pressurizing cavity (101) through an air pipe; a second lower sealing plate (604) is arranged on the lower port of the second cylinder body (601), a second air pressure balancing port (605) is formed in the second lower sealing plate (604), and the second air pressure balancing port (605) is communicated with the external atmospheric pressure; a second air inlet (606) and a second air outlet (607) are formed in the side wall of the second cylinder body (601), an external opening of the second air inlet (606) is connected with an external air source (7) through an air pipe, and an external opening of the second air outlet (607) is connected with the test pressurizing cavity (102) through an air pipe; a second piston a (608), a second piston b (609), a second piston c (610) and a second spring (611) are sequentially arranged in the second cylinder body (601) from top to bottom, the second piston a (608), the second piston b (609) and the second piston c (610) are relatively fixed through a second connecting rod (612), the second piston a (608), the second piston b (609) and the second piston c (610) are in sliding sealing fit with the inner wall of the second cylinder body (601), and the second piston a (608), the second piston b (609), the second piston c (610) and the second connecting rod (612) can synchronously move up and down in the second cylinder body (601); the upper end of the second spring (611) is abutted against the bottom of the second piston c (610), and the lower end of the second spring is abutted against the top of the second lower sealing plate (604);
when the second piston a (608), the second piston b (609), the second piston c (610) and the second connecting rod (612) are located at the highest limit position in the second cylinder (601), the second air inlet (606) is located between the second piston a (608) and the second piston b (609), and the second air outlet (607) is located between the second piston b (609) and the second piston c (610), namely, the communication between the second air inlet (606) and the second air outlet (607) is cut off by the second piston b (609); when the second piston a (608), the second piston b (609), the second piston c (610) and the second connecting rod (612) are located at the lowest limit position in the second cylinder (601), the second air inlet (606) and the second air outlet (607) are located between the second piston a (608) and the second piston b (609), namely, the second air inlet (606) and the second air outlet (607) are communicated.
3. The pipe airtightness detection apparatus according to claim 2, wherein: and a stop valve (8) is arranged on an air pipe which is connected with an external air source (7) through an external opening of the second air inlet (606).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097729.0A CN111120878A (en) | 2020-02-18 | 2020-02-18 | Pipeline air tightness detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097729.0A CN111120878A (en) | 2020-02-18 | 2020-02-18 | Pipeline air tightness detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111120878A true CN111120878A (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010097729.0A Withdrawn CN111120878A (en) | 2020-02-18 | 2020-02-18 | Pipeline air tightness detection device |
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| CN (1) | CN111120878A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321736A (en) * | 2022-01-10 | 2022-04-12 | 深圳市民乐管业有限公司 | Pipeline pressure fluctuation testing machine capable of preventing leakage of pipe orifice |
-
2020
- 2020-02-18 CN CN202010097729.0A patent/CN111120878A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114321736A (en) * | 2022-01-10 | 2022-04-12 | 深圳市民乐管业有限公司 | Pipeline pressure fluctuation testing machine capable of preventing leakage of pipe orifice |
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