CN210108623U - Double-wall pipe air tightness detection tool - Google Patents
Double-wall pipe air tightness detection tool Download PDFInfo
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- CN210108623U CN210108623U CN201921127317.6U CN201921127317U CN210108623U CN 210108623 U CN210108623 U CN 210108623U CN 201921127317 U CN201921127317 U CN 201921127317U CN 210108623 U CN210108623 U CN 210108623U
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Abstract
The utility model discloses a double-wall pipe air tightness detection tool, which comprises a blank cap, a test cover plate, a water inlet pipe group, a water outlet pipe group and an air inlet pipe, wherein the blank cap plugs the natural gas inlet of the double-wall pipe, and the test cover plate and the cover plate respectively seal the two ends of the double-wall pipe; one end of the water inlet pipe group and one end of the water outlet pipe group are respectively connected with the test cover plate, and the air inlet pipe is connected with the air inlet joint. The input water pipe and the output water pipe are respectively communicated with an annular cavity between the inner wall and the outer wall of the double-wall pipe, and the air inlet joint is communicated with the inner cavity of the double-wall pipe. The utility model discloses simple structure, it is easy and simple to handle, improved the detection work efficiency.
Description
Technical Field
The utility model relates to a pipeline detects the frock, especially relates to a detect detection frock of detecting double fuel diesel engine double-walled pipe leakproofness, belongs to the diesel engine and makes technical field.
Background
With the continuous improvement of the requirements on energy conservation and emission reduction of ships, clean gas fuel represented by natural gas is increasingly applied to ships, but the gas fuel belongs to dangerous gas, the specifications of the ships clearly require that all natural gas conveying pipelines arranged in a cabin are in a double-wall pipe structure, an inner pipe is used for conveying the natural gas, and an annular cavity between an outer pipe and the inner pipe is a circulating pipeline of negative pressure air or inert gas so as to avoid the danger of natural gas leakage. If the inner wall and the outer wall of the double-wall pipe leak mutually, the natural gas is brought into the atmosphere by the gas on the outer wall and even flows into the engine room, so that explosion is caused, and the result is not reasonable. Therefore, the tightness of the inner and outer walls of the double-wall pipe is an important safety condition for the gas mode of the double-fuel machine.
The utility model relates to a double-walled pipe is used for installing the cylinder head position at double fuel diesel engine, and the structure is complicated, and its material is nodular cast iron. It must be tested for gas tightness in order to ensure safe operation of the dual fuel diesel engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple structure, low in manufacturing cost, convenient operation's double-walled pipe gas tightness detect frock to the gas tightness that realizes the double-walled pipe detects.
The utility model discloses a following technical scheme realizes:
a double-wall pipe air tightness detection tool comprises a blank cap, a test cover plate, a water inlet pipe group, a water outlet pipe group and an air inlet pipe, wherein the blank cap blocks a natural gas inlet on one side of the middle part of the double-wall pipe, and the test cover plate and the cover plate respectively seal two ends of the double-wall pipe; one end of the water inlet pipe group and one end of the water outlet pipe group are respectively connected with an input water pipe and an output water pipe which are arranged on the testing cover plate, and the air inlet pipe is connected with an air inlet joint which is arranged between the input water pipe and the output water pipe of the testing cover plate; the input water pipe and the output water pipe are respectively communicated with an annular cavity between the inner wall and the outer wall of the double-wall pipe, and the air inlet joint is communicated with the inner cavity of the double-wall pipe.
The object of the invention is further achieved by the following technical measures.
Furthermore, the blank cap is of a stepped shaft structure, sealing ring grooves corresponding to the specifications of the O-shaped sealing rings are respectively arranged in the radial direction of a first section, the radial direction of a second section and the radial direction of a third section of the stepped shaft from large to small in diameter, the axial positions of the sealing ring grooves respectively correspond to the positions of the outer wall, the inner wall and the gas injection port of the double-wall pipe, and a flange ring radially extends out of the outer side of the first section of the stepped shaft.
Further, the water inlet pipe group comprises a water inlet pipe, a water inlet ball valve and a funnel, one end of the water inlet pipe is connected with an input water pipe on the test cover plate through the water inlet ball valve, and the other end of the water inlet pipe is connected with the lower end of the funnel.
Furthermore, the water outlet pipe group comprises a water outlet pipe, a water outlet ball valve and a pressure gauge, and the water outlet pipe is connected with the pressure gauge and then connected with the water outlet ball valve.
The utility model discloses a double-walled pipe gas tightness detects frock simple structure adopts the natural gas import of stifled double-walled pipe middle part one side of stifled, and test stifled board and apron seal the both ends of double-walled pipe respectively, and the inlet pipe group communicates with each other with the inner wall of double-walled pipe and the toroidal cavity between the outer wall respectively with the play water pipe group, intake pipe one end and the communicating structure of inner chamber of double-walled pipe. Double-walled pipe gas tightness detects easy and simple to handle, through the annular cavity water injection between the inner wall of inlet tube group to double-walled pipe and the outer wall, the rethread compressed air pipe injects compressed air to the inner chamber of double-walled pipe, and last pressurize a period, it deposits water and whether there is the bubble to observe the funnel of play water pipe group, detect the double-walled pipe in, whether leak between the outer, detect quick simple and convenient, the accuracy is high, the gas leakage hidden danger of double-walled pipe has been eliminated, double-walled pipe gas tightness test's accuracy has been improved, the detection work efficiency has been improved. The gas tightness detection of the double-wall pipes of different models can be realized only by replacing different test cover plates, cover plates and blank caps, and the universality is good.
The advantages and features of the invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of the connection between the inspection tool and the double-walled pipe of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
fig. 3 is a sectional view B-B of fig. 1.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1-3, the utility model discloses a double-walled pipe gas tightness detects frock includes stifle 1, test apron 2, apron 3, inlet pipe group 4, outlet pipe group 5 and intake pipe 6, and the natural gas import 101 of stifle 1 shutoff double-walled pipe 10 middle part one side tests apron 2 and apron 3 and seals the both ends of double-walled pipe 10 respectively. The lower end of the water inlet pipe group 4 and the lower end of the water outlet pipe group 5 are respectively connected with an input water pipe 21 and an output water pipe 22 which are arranged on the testing cover plate 2, and the air inlet pipe 6 is connected with an air inlet joint 23 which is arranged between the input water pipe 21 and the output water pipe 22 of the testing cover plate. The inlet and outlet pipes 21, 22 each open into an annular space 106 between the inner wall 102 and the outer wall 103 of the double-walled pipe 10, and the inlet connection 23 opens into the interior 105 of the double-walled pipe 10.
As shown in fig. 3, the blank cap 1 has a stepped shaft structure, wherein a first seal ring groove 111, a second seal ring groove 121 and a third seal ring groove 131 corresponding to the specifications of the O-ring 7 are respectively arranged in the radial direction of a first section 11, the radial direction of a second section 12 and the radial direction of a third section 13 of the stepped shaft from large to small, the axial positions of the three seal ring grooves respectively correspond to the positions of the outer wall 103, the inner wall 102 and the gas injection port 104 of the double-wall pipe 10, and a flange ring 112 radially extends out of the outer side of the first section 11 of the stepped shaft.
As shown in fig. 2, the water inlet pipe set 4 includes a water inlet pipe 41, a water inlet ball valve 42 and a funnel 43, one end of the water inlet pipe 41 is connected to the input water pipe 22 on the test cover plate 2 through the water inlet ball valve 42, and the other end of the water inlet pipe 41 is connected to the lower end of the funnel 43. The water outlet pipe group 5 comprises a water outlet pipe 51, a water outlet ball valve 52 and a pressure gauge 53, and the water outlet pipe 41 is connected with the water outlet ball valve 52 after being connected with the pressure gauge 53. The water outlet ball valve 52 is used for discharging the water stored in the annular cavity 104 between the inner wall 102 and the outer wall 103 of the double-walled pipe 10, and the pressure gauge 53 is used for detecting the pressure of the water stored.
Use the utility model discloses detect double-walled pipe's process as follows:
1) the detection tool is arranged on the double-wall pipe 10
The installation of the blank cap 1, the test cover plate 2 and the cover plate 3 is not in sequence, and the embodiment is described by the process of firstly installing the blank cap 1 and then installing the test cover plate 2 and the cover plate 3;
the O-shaped sealing rings 7 with corresponding specifications are respectively arranged in a first sealing ring groove 111, a second sealing ring groove 121 and a third sealing ring groove 131 which are radially corresponding to each section of the stepped shaft of the blank cap 1, then the stepped shaft of the blank cap 1 is inserted into the natural gas inlet hole 101 on one side of the middle part of the double-wall pipe 10, and the corresponding O-shaped sealing rings respectively seal the inner wall 102, the outer wall 103 and the fuel gas injection port 104 of the double-wall pipe to block the communication between the inner cavity 105 and the annular cavity 106. The flange ring 112 of the blank cap 1 is then fastened to the end face of the natural gas inlet opening 101 on the side of the double-walled pipe 10 by means of a plurality of fastening screws 113.
The O-shaped sealing rings with corresponding specifications are respectively arranged in corresponding sealing ring grooves of the two end faces of the double-wall pipe 10, the testing cover plate 1 and the cover plate 2 are respectively fixed on the two end faces of the double-wall pipe 10 by fastening screws, one end of the water inlet pipe group 4 and one end of the water outlet pipe group 5 are respectively connected with the input water pipe 22 and the output water pipe on the testing cover plate 2, the air inlet pipe 6 is also connected with the air inlet joint 23, and the installation of the detection tool is completed.
2) Double-walled pipe 10 gas tightness detection
2.1) opening the water inlet ball valve 42, closing the water outlet ball valve 52, adding fresh water to the water inlet pipe group 4 through the funnel 43, and injecting the fresh water into the annular cavity 106 between the inner wall 102 and the outer wall 103 of the double-wall pipe 10 through the water inlet pipe group 4 and the input water pipe 21 in sequence in the direction indicated by the solid arrow in fig. 2 until the annular cavity 106 is filled with the fresh water, and stopping adding the fresh water when the liquid level of the fresh water stays at 3/4 at the upper part of the funnel 43.
2.2) connecting one end of the air inlet joint 23 with a compressed air pipe, injecting compressed air into the inner cavity 105 of the double-walled pipe 10 through the compressed air pipe 231 and the air inlet joint 23 as indicated by the hollow arrow in fig. 2, adjusting the pressure of the compressed air to 1.0MPa and maintaining the pressure for 1 hour. If there is no bubble in the water stored in the hopper 43, it indicates that the air tightness of the double-walled pipe 10 to be detected meets the requirement; if air bubbles appear in the water stored in the funnel 43, it indicates that there is a leak between the annular cavity 106 of the double-walled pipe 10 to be tested and the inner cavity 105 of the inner layer 102, the inner and outer walls of the double-walled pipe 10 are communicated, and the air tightness is lost.
In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions adopting equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.
Claims (4)
1. The double-wall pipe air tightness detection tool is characterized by comprising a blank cap, a test cover plate, a water inlet pipe group, a water outlet pipe group and an air inlet pipe, wherein the blank cap blocks a natural gas inlet on one side of the middle part of the double-wall pipe, and the test cover plate and the cover plate respectively seal two ends of the double-wall pipe; one end of the water inlet pipe group and one end of the water outlet pipe group are respectively connected with an input water pipe and an output water pipe which are arranged on the testing cover plate, and the air inlet pipe is connected with an air inlet joint which is arranged between the input water pipe and the output water pipe of the testing cover plate; the input water pipe and the output water pipe are respectively communicated with an annular cavity between the inner wall and the outer wall of the double-wall pipe, and the air inlet joint is communicated with the inner cavity of the double-wall pipe.
2. The double-walled pipe airtightness detection tool according to claim 1, wherein the blank cap is of a stepped shaft structure, sealing ring grooves corresponding to the specifications of O-ring seals are respectively provided in a first section, a second section and a third section of the stepped shaft from large to small in diameter, the axial positions of the sealing ring grooves respectively correspond to the positions of the outer wall, the inner wall and the gas injection port of the double-walled pipe, and a flange ring radially extends from the outer side of the first section of the stepped shaft.
3. The double-walled pipe airtightness detection tool according to claim 1, wherein the water inlet pipe group comprises a water inlet pipe, a water inlet ball valve and a funnel, one end of the water inlet pipe is connected with an input water pipe on the test cover plate through the water inlet ball valve, and the other end of the water inlet pipe is connected with the lower end of the funnel.
4. The double-walled pipe airtightness detection tool according to claim 1, wherein the water outlet pipe group comprises a water outlet pipe, a water outlet ball valve and a pressure gauge, and the water outlet pipe is connected with the water outlet ball valve after being connected with the pressure gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921127317.6U CN210108623U (en) | 2019-07-18 | 2019-07-18 | Double-wall pipe air tightness detection tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921127317.6U CN210108623U (en) | 2019-07-18 | 2019-07-18 | Double-wall pipe air tightness detection tool |
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| Publication Number | Publication Date |
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| CN210108623U true CN210108623U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921127317.6U Active CN210108623U (en) | 2019-07-18 | 2019-07-18 | Double-wall pipe air tightness detection tool |
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| CN (1) | CN210108623U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220653A (en) * | 2019-07-18 | 2019-09-10 | 中船动力有限公司 | Double-wall pipe air-tightness detection tool and detection method |
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2019
- 2019-07-18 CN CN201921127317.6U patent/CN210108623U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220653A (en) * | 2019-07-18 | 2019-09-10 | 中船动力有限公司 | Double-wall pipe air-tightness detection tool and detection method |
| CN110220653B (en) * | 2019-07-18 | 2024-05-10 | 中船动力有限公司 | Double-wall pipe air tightness detection tool and detection method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 402, Changjiang Road, Zhenjiang City, Jiangsu Province, 212002 Patentee after: China Shipbuilding Power Zhenjiang Co.,Ltd. Address before: 402 Changjiang Road, Runzhou District, Zhenjiang City, Jiangsu Province Patentee before: CSSC MARINE POWER Co.,Ltd. |
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| CP03 | Change of name, title or address |