CN116952483A - Low-vacuum tunnel joint micro-leakage test device and test method thereof - Google Patents
Low-vacuum tunnel joint micro-leakage test device and test method thereof Download PDFInfo
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- CN116952483A CN116952483A CN202310920095.8A CN202310920095A CN116952483A CN 116952483 A CN116952483 A CN 116952483A CN 202310920095 A CN202310920095 A CN 202310920095A CN 116952483 A CN116952483 A CN 116952483A
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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Abstract
The application relates to the technical field of low vacuum tunnels, in particular to a low vacuum tunnel joint micro-leakage test device and a test method thereof, wherein the test device comprises a supporting plate, one side of the supporting plate is provided with a cover plate, two annular first gaskets and two annular second gaskets are arranged between the supporting plate and the cover plate, the circumference of each second gasket is larger than that of each first gasket, the two first gaskets and the two second gaskets are stacked together, the sides, away from each other, of the two first gaskets and the two second gaskets are respectively embedded into the supporting plate and the cover plate, the cover plate is connected with a gas flowmeter communicated with the interiors of cavities among the first gaskets, the second gaskets, the supporting plate and the cover plate, and the cover plate is connected with a vacuum pump and a vacuum pressure gauge communicated with the interiors of the cavities among the first gaskets, the supporting plate and the cover plate, so that the micro-leakage amount at the joint of the low vacuum tunnel is conveniently tested, and the effect of providing guidance for the design of a vacuum maintenance system in the operation period of the low vacuum tunnel is achieved.
Description
Technical Field
The application relates to the technical field of low vacuum tunnels, in particular to a low vacuum tunnel joint micro-leakage test device and a test method thereof.
Background
The wheel-rail system is greatly accelerated under the influence of factors such as air resistance, wheel-rail friction and the like, the bottleneck is more economically realized, and in order to solve the problem, a 5 th type transportation mode is proposed, namely, the wheel-rail friction is reduced by utilizing a magnetic levitation technology, and the air resistance is reduced by constructing a low-vacuum pipeline. At present, a feasible scheme for constructing the low vacuum pipeline is that an overhead tunnel is adopted on the ground and a tunnel is adopted underground. For an underground tunnel, the segment lining structure has the advantages of mature technology, safety, reliability, environmental protection, energy saving, convenient construction, small disturbance to the surrounding environment and the like, and can be used as one of the preferable schemes for constructing the underground low-vacuum environment carrier.
In the prior art, the underground tunnel is formed by mutually splicing a plurality of duct piece rings, the gap between two adjacent duct piece rings is a circular seam, each duct piece ring is formed by mutually splicing a plurality of arc-shaped duct pieces, the gap between two adjacent duct pieces is a longitudinal seam, and the joint between the longitudinal seam and the circular seam is called a T seam. In the process of building an underground tunnel, the tightness of a circular seam and a longitudinal seam is one of key problems which need to be concerned; at present, the common method for solving the joint sealing is to install an elastic gasket between adjacent duct pieces, and the contact pressure on the contact surface of the permeation path is not less than the pressure difference at two sides of the contact surface, so that the sealing is considered to be effective. However, under the state of the art conditions, absolute smoothness of the surface of the material cannot be achieved, and on a microscopic scale, the surface of the material is in relief, i.e. the surface of the material is composed of a number of asperities (asperities) of varying scale. The convex-concave shape makes the small micro-convex bodies possibly not mutually contacted in the contact process, so that a through capillary seepage channel is formed, and micro leakage is accompanied, which is a main reason that the contact seal can only realize relative seal, but cannot realize absolute seal. The micro leakage has the characteristics of low leakage rate, long duration and the like, and the micro leakage at a gap in unit length in a short time has little influence on the environment of a low-vacuum tunnel, but the accumulated length of a joint of a segment structure is considerable for the whole tunnel, and the long-time micro leakage amount is not negligible.
The prior art solutions described above have the following drawbacks: since low vacuum tunnels are typically buried below the earth's surface and the number of joints on the lining structure is large, testing micro-leaks at the joints in the background of practical engineering presents a significant challenge.
Disclosure of Invention
The application provides a low vacuum tunnel joint micro-leakage test device and a test method thereof, which are used for conveniently testing the micro-leakage quantity at the joint of a low vacuum tunnel and providing guidance for the maintenance of the vacuum degree and the design of a vacuum maintaining system in the operation period of the low vacuum tunnel.
The technical aim of the application is realized by the following technical scheme:
the utility model provides a little leakage test device of low vacuum tunnel seam, including the layer board, one side of layer board is provided with the apron, be provided with two annular first gaskets and two annular second gaskets between layer board and the apron, the girth of second gasket is greater than the girth of first gasket, two first gaskets, two second gaskets are all stacked together, two first gaskets, two second gaskets are kept away from each other the side imbeds layer board and apron inside respectively, be connected with on the apron with first gasket, the second gasket, the air flowmeter of the inside UNICOM of cavity between layer board and the apron, be connected with on the apron with first gasket, vacuum pump and the vacuum pressure gauge of the inside UNICOM of cavity between layer board and the apron.
Through adopting above-mentioned scheme, when using, stack first gasket, the second gasket between layer board and apron, first gasket, cavity between layer board and the apron is closed cavity, cavity between first gasket, the second gasket, layer board and the apron is semi-closed cavity, empty cavity between first gasket, layer board and the apron is vacuumed through the vacuum pump, can exist the atmospheric pressure difference between closed cavity and semi-closed cavity this moment, the gas in the semi-closed body gets into the closed body inside through the sealing interface, gas pressure reduces along with it in the semi-closed body this moment, in order to keep pressure balance, the gas of external environment can be supplied to the semi-closed cavity, its flow is monitored by the only passageway gas flowmeter real-time between external environment and the semi-closed, just so can test the little leakage volume of department low vacuum tunnel seam department, the effect of conveniently providing the instruction for the maintenance of low vacuum tunnel operation period vacuum degree and the design of vacuum maintenance system has been reached.
Preferably, the central position of the cover plate is connected with a hose, one end of the hose, which is close to the cover plate, penetrates through the central position of the cover plate and extends to the position between the cover plate and the support plate in the direction close to the support plate, one end of the hose, which is far away from the cover plate, is connected with a vacuum pump, a branch pipe is communicated with the hose, and a broken air valve is arranged on the branch pipe.
Preferably, a vacuum valve is mounted on the hose, the vacuum valve being mounted between the manifold and the vacuum pump.
Preferably, a plurality of pre-tightening bolts are uniformly arranged at intervals along the edge position of the supporting plate, the pre-tightening bolts extend to the direction close to the cover plate and penetrate through the space between the supporting plate and the cover plate, and a first limit nut in threaded fit with the pre-tightening bolts is arranged between the cover plate and the supporting plate.
Preferably, a load sensor is arranged on one side of the pre-tightening nut, which is close to the cover plate, and the load sensor is coupled with a control center.
Preferably, a notch is formed in the center of the supporting plate, two extending plates extending in the direction away from the cover plate are arranged at the notch, the two extending plates are respectively and fixedly connected with the supporting plates on two sides of the notch vertically, a gap exists between the two extending plates, and an auxiliary assembly capable of detecting micro leakage is arranged between the two extending plates.
Preferably, the auxiliary assembly comprises two third gaskets and two fourth gaskets, the third gaskets and the fourth gaskets are all C-shaped with openings facing one side of the cover plate, the length of the fourth gaskets is larger than that of the third gaskets and the fourth gaskets are sleeved outside the third gaskets, the two third gaskets and the two fourth gaskets are all placed on two sides of the center between the two extending plates and are symmetrical about the center between the two extending plates, the first gaskets and the second gaskets close to one side of the supporting plate are disconnected at the notch, the ends of the two third gaskets close to the cover plate are fixedly connected with the ends of the two first gaskets close to the notch, and the ends of the two fourth gaskets close to the cover plate are fixedly connected with the ends of the second gaskets close to the notch.
Preferably, the position that the apron was kept away from to the extension board is provided with auxiliary bolt, and auxiliary bolt runs through two extension boards simultaneously, is provided with auxiliary nut on the auxiliary bolt, and auxiliary nut is provided with pressure data acquisition instrument near one side of extension board, is provided with the second stop nut that uses with auxiliary bolt cooperation between two extension boards.
The test method of the low vacuum tunnel joint micro-leakage test device comprises the following steps:
s1, assembling: assembling the test device;
s2, debugging: calculating initial contact pressures of contact surfaces of the two first gaskets and the two second gaskets to enable the contact pressures to be equal to the contact pressures of actual working conditions;
s3, state adjustment: tightening or loosening the pre-tightening nut to enable the test device to be switched between a circular seam micro-leakage test state and a longitudinal seam micro-leakage test state;
s4, testing: the data of the gas flowmeter is monitored, the monitoring period is 480 hours, and then the test is ended.
Preferably, in step S1, in the process of assembling the test device, if the test device is a T-slot micro-leakage test, the pallet with the extension board mounted thereon is required to be assembled with the cover board.
In summary, the application has the following technical effects:
1. by arranging the low vacuum tunnel joint micro leakage test device, the sealing environments of the circular seam, the longitudinal seam and the T seam in the low vacuum tunnel can be simulated, and the micro leakage amount in the joint in the low vacuum tunnel can be monitored;
2. when the test device is used for monitoring the micro leakage quantity of the joint, the pre-tightening bolt and the pre-tightening nut are matched for use, so that the support plate and the cover plate are screwed together, and the support plate and the cover plate are not required to be tightly pressed by people by using articles such as jacks, and the effect of enabling the test device to be more convenient to use is achieved;
3. through having set up extension board, third gasket and fourth gasket, in actual test, people can be used for simultaneously monitoring the leakage quantity of T seam with the test device that includes extension board, third gasket and fourth gasket, have reached the effect that promotes test device application scope.
Drawings
FIG. 1 is a block diagram of a test apparatus according to a first embodiment of the present application;
FIG. 2 is a block diagram of a test apparatus in a second embodiment of the present application;
FIG. 3 is a flow chart of a test method of a test device according to a first embodiment of the present application;
FIG. 4 is a flow chart of a test method of a test apparatus in a second embodiment of the present application.
In the figure, 1, a supporting plate; 11. an extension plate; 12. an auxiliary component; 121. a third gasket; 122. a fourth gasket; 124. an auxiliary bolt; 125. an auxiliary nut; 126. a data acquisition instrument; 2. a cover plate; 21. a hose; 22. a branch pipe; 23. a vacuum valve; 24. a blow valve; 25. pre-tightening a bolt; 26. pre-tightening the nut; 27. a load sensor; 28. a first limit nut; 29. the second limit nut; 3. a first gasket; 4. a second gasket; 5. a gas flow meter; 6. a vacuum pump; 7. a vacuum pressure gauge.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the application provides a low vacuum tunnel joint micro leakage test device, which comprises a supporting plate 1, a cover plate 2, a first gasket 3, a second gasket 4, a gas flowmeter 5, a vacuum pump 6 and a vacuum pressure gauge 7, wherein the upper surface of the supporting plate 1 is horizontal, the cover plate 2 is horizontally arranged above the supporting plate 1, the lower surface of the cover plate 2 is horizontal, the first gasket 3 and the second gasket 4 are respectively provided with two gaskets, the first gasket 3 and the second gasket 4 are respectively arranged in a ring shape, the circumference of the first gasket 3 is smaller than that of the second gasket 4, the two first gaskets 3 are stacked together from bottom to top, the two second gaskets 4 are stacked together from bottom to top, the side surfaces of the two first gaskets 3, the side surfaces of the two second gaskets 4, which are far away from each other, are respectively embedded into the side surfaces of the cover plate 2 and the supporting plate 1, and the second gaskets 4 are sleeved outside the first gaskets 3; the gas flowmeter 5 is communicated with the inside of the cavity among the first gasket 3, the second gasket 4, the supporting plate 1 and the cover plate 2, and the vacuum pump 6 and the vacuum pressure gauge 7 are communicated with the inside of the cavity among the first gasket 3, the supporting plate 1 and the cover plate 2.
When the low-vacuum tunnel joint test device is used, the first gasket 3 and the second gasket 4 are stacked between the supporting plate 1 and the cover plate 2, the cavities between the first gasket 3 and the supporting plate 1 and between the supporting plate 2 are closed cavities, the cavities between the first gasket 3 and the second gasket 4 and between the supporting plate 1 and the cover plate 2 are semi-closed cavities, the cavities between the first gasket 3 and the supporting plate 1 and between the supporting plate 2 are vacuumized through the vacuum pump 6, at the moment, air pressure difference exists between the closed cavities and the semi-closed cavities, air in the semi-closed cavities enters the closed cavities through a sealing interface, at the moment, the air pressure in the semi-closed cavities is reduced, so that the air pressure balance is kept, the air in the external environment is supplemented into the semi-closed cavities, the flow of the air is monitored in real time by the only channel air flowmeter 5 between the external environment and the semi-closed, so that the micro leakage quantity at the joint of the low-vacuum tunnel joint can be tested, and the effect of conveniently guiding the maintenance of the vacuum degree in the low-vacuum tunnel operation period and the design of the vacuum maintenance system is achieved; when the test device of the present application is used to monitor the amount of leakage at the joint, the load between the pallet 1 and the cover plate 2 is controlled by tightening the pre-tightening bolts.
Specifically, a hose 21 is connected to the center of the side surface of the cover plate 2 away from the supporting plate 1, an insertion hole matched with the hose 21 is formed in the center of the cover plate 2, one end of the hose 21, which is close to the cover plate 2, extends into the insertion hole and is in sealed communication with a gap between the cover plate 2 and the supporting plate 1, and one end of the hose 21, which is far away from the cover plate 2, is connected with a vacuum pump 6; the hose 21 is also communicated with a branch pipe 22 and a vacuum valve 23, the position of the vacuum valve 23 on the hose 21 is positioned between the branch pipe 22 and the vacuum pump 6, and the branch pipe 22 is provided with a hollow breaking valve 24.
In this embodiment, when the closed cavity needs to be evacuated, the vacuum breaking valve 24 is closed, the vacuum valve 23 is opened, and the vacuum pump 6 will evacuate the closed cavity; when it is desired to restore the enclosure to the same pressure as the outside atmosphere, the vent valve 24 is opened and outside air is introduced into the enclosure through the manifold 22.
In order to make the test device more convenient to use, a plurality of pre-tightening bolts 25 are uniformly arranged on the support plate 1 at intervals along the edge position of the support plate 1, the pre-tightening bolts 25 extend to the direction close to the cover plate 2 and penetrate through the support plate 1 and the cover plate 2 to be connected with pre-tightening nuts 26, and first limit nuts 28 matched with the pre-tightening bolts 25 for use are arranged between the support plate 1 and the cover plate 2; the pretension nut 26 is provided with a load sensor 27 on the side close to the cover plate 2, the load sensor 27 being coupled to a control center. When the test device is used for monitoring the micro leakage amount of the circumferential seam, people can screw the pre-tightening nut 26, and the load sensor 27 and the control center can conveniently control the pre-tightening force of the pre-tightening bolt 25 and the pre-tightening nut 26 on the cover plate 2 and the supporting plate 1, so that people do not need to apply downward pressure to the cover plate 2 by using a jack, and the effect that the test device is more convenient to use is achieved;
when the test device is used for testing the micro leakage amount of the circular seam, the closed cavity is vacuumized, the two first gaskets 3 or the two second gaskets 4 are mainly subjected to external force parallel to the contact surface, at the moment, the first limit nuts 28 are screwed, and the supporting plate 1 and the cover plate 2 are clamped under the combined action of the first limit nuts 28, the pre-tightening bolts 25 and the pre-tightening nuts 25; if the micro leakage amount is tested by the longitudinal joint, after the sealed cavity is vacuumized, the two first gaskets 3 and the two second gaskets 4 are tightly attached under the action of the external atmospheric pressure, and then people can loosen the pre-tightening nut 25 and the first limit nut 28.
In this example, the control center uses a single-chip microcomputer, and other control centers with the same function are still applicable.
Referring to fig. 2, in other examples, the test apparatus of the present application may monitor the leakage amount of the T-joint of the underground tunnel at the same time, and the specific structure thereof is different from that of the above embodiment in that: the center of the supporting plate 1 is provided with a notch which penetrates through the supporting plate 1 and divides the supporting plate 1 into two parts, two extending plates 11 which extend towards the direction far away from the cover plate 2 are arranged at the position of the notch, the two extending plates 11 are respectively and vertically fixedly connected with the supporting plate 1 at two sides of the notch, a gap exists between the two extending plates 11, and an auxiliary assembly 12 which can detect micro leakage is arranged. When people need to monitor the T-joint leakage amount in the underground tunnel at the same time, the two extension plates 11 and the auxiliary assembly 12 between the extension plates 11 can simulate the longitudinal joint sealing structure in the underground tunnel to monitor the longitudinal joint leakage amount; the supporting plate 1, the first gasket 3, the second gasket 4 and the cover plate 2 are used for simulating a circular seam sealing structure in the underground tunnel and monitoring the circular seam leakage.
The auxiliary assembly 12 comprises two third gaskets 121 and two fourth gaskets 122, the third gaskets 121 and the fourth gaskets 122 are of a C-shaped structure, the length of the fourth gaskets 122 is larger than that of the third gaskets 121, the two third gaskets 121 and the two fourth gaskets 122 are placed on two sides of the center between the two extending plates 11 and are symmetrical relative to the center between the two extending plates 11, the first gaskets 3 and the second gaskets 4 close to the extending plates are disconnected at the positions of the gaps, the two third gaskets 121 are fixedly connected with two ends of the first gaskets 3 on two sides of the gaps, and the two fourth gaskets 122 are fixedly connected with the second gaskets 4 on two sides of the gaps. When in use, the third gasket 121, the two extension plates 11, the two first gaskets 3 and the cavity between the cover plates 2 are the same as the first gaskets 3 and the cavity between the supporting plate 1 and the cover plates 2 and are in a vacuum closed state; the monitoring process is also the same as in the above embodiment.
Further, an auxiliary bolt 124 is disposed at a position of the extension plate 11 far from the cover plate 2, the auxiliary bolt 124 penetrates through the two extension plates 11 at the same time, an auxiliary nut 125 is disposed on the auxiliary bolt 124, a pressure data acquisition instrument 126 is disposed on one side of the auxiliary nut 125 near the extension plate 11, and a second limit nut 29 matched with the auxiliary bolt 124 is disposed between the two extension plates 11. In the present embodiment, the functions of the auxiliary bolt 124, the auxiliary nut and the second limit nut 29 are the same as those of the pre-tightening bolt 25, the pre-tightening nut 26 and the first limit nut 28, and will not be repeated here.
Referring to fig. 3, the application further provides a testing method of the low vacuum tunnel joint micro-leakage testing device, in one embodiment, the testing method comprises the following steps:
s1, starting: assembling the test device, wherein the assembly needs to be based on whether the monitored gap is a circular gap or a longitudinal gap;
s2, debugging: setting initial opening amount, calculating initial contact pressure of contact surfaces of the two first gaskets 3 and the two second gaskets 4 by using a load sensor 27, and adjusting to make the contact pressure equal to the contact pressure of an actual working condition;
s3, state adjustment: adjusting the pre-tightening bolt 25, the pre-tightening nut 26 or the pre-tightening nut according to the gap to be monitored; the states of the tightening bolts, the pre-tightening nuts 26, the auxiliary bolts 124 and the auxiliary nuts 125 enable the test device to monitor the corresponding gaps;
s4, testing: opening a vacuum valve 23, closing a vacuum breaking valve 24, starting a vacuum pump 6, vacuumizing the space among the first gasket 3, the cover plate 2 and the supporting plate 1 to reach a preset vacuum degree state, maintaining the pressure, monitoring the data of the gas flowmeter 5, and ending the test after the monitoring period is 480 hours;
referring to fig. 4, in other examples, when the micro leakage amount of the T-slot is monitored using the test apparatus, the test method is different from the above test method in that:
in step S2, an initial opening amount of the longitudinal seam is set, and then initial contact pressures of contact surfaces of the third gasket 121 and the fourth gasket 122 in the longitudinal seam are calculated and adjusted by using data of the load sensor 27, so that the contact pressures are n times of the designed contact pressures of the working conditions, wherein n is a natural number; then setting the initial opening amount of the circular seam, calculating the initial contact pressure of the contact surface between the first gasket 3 and the second gasket 4 in the circular seam by using the data of the load sensor 27, and adjusting the initial contact pressure to ensure that the contact pressure is equal to the designed contact pressure of the working condition; the other steps are the same as those described above.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. A low vacuum tunnel seam micro leakage test device is characterized in that: including layer board (1), one side of layer board (1) is provided with apron (2), be provided with two annular first gaskets (3) and two annular second gaskets (4) between layer board (1) and the apron (2), the girth of second gasket (4) is greater than the girth of first gasket (3), two first gaskets (3), two second gaskets (4) are all stacked together, two first gaskets (3), the side that two second gaskets (4) kept away from each other imbeds layer board (1) and apron (2) inside respectively, be connected with on apron (2) with first gasket (3), second gasket (4), be connected with on apron (2) with first gasket (3), vacuum pump (6) UNICOM and vacuum gauge (7) of cavity inside between layer board (1) and the apron (2) gas flowmeter (5) of cavity inside UNICOM.
2. The low vacuum tunnel joint micro-leakage test apparatus of claim 1, wherein: the central point of apron (2) is put and is connected with hose (21), and the one end that hose (21) is close to apron (2) runs through in the central point of apron (2) to be close to the direction of layer board (1) and extend to between apron (2) and layer board (1), and the one end that apron (2) was kept away from to hose (21) is connected with vacuum pump (6), and the UNICOM has branch pipe (22) on hose (21), installs broken empty valve (24) on branch pipe (22).
3. The low vacuum tunnel joint micro-leakage test apparatus of claim 2, wherein: a vacuum valve (23) is arranged on the hose (21), and the vacuum valve (23) is arranged between the branch pipe (22) and the vacuum pump (6).
4. The low vacuum tunnel joint micro-leakage test apparatus of claim 1, wherein: a plurality of pre-tightening bolts (25) are uniformly arranged at intervals along the edge position of the supporting plate (1), the pre-tightening bolts (25) extend to the direction close to the cover plate (2) and penetrate through the supporting plate (1) and the cover plate (2) to be connected with pre-tightening nuts (26), and first limit nuts (28) in threaded fit with the pre-tightening bolts (25) are arranged between the cover plate (2) and the supporting plate (1).
5. The low vacuum tunnel joint micro-leakage test apparatus according to claim 4, wherein: a load sensor (27) is arranged on one side, close to the cover plate (2), of the pre-tightening nut (26), and the load sensor (27) is coupled with a control center.
6. A low vacuum tunnel seam microleakage test apparatus as in any of claims 1-5 wherein: a gap is formed in the center of the supporting plate (1), two extending plates (11) extending in the direction away from the cover plate (2) are arranged at the gap, the two extending plates (11) are respectively and fixedly connected with the supporting plate (1) on two sides of the gap vertically, a gap exists between the two extending plates (11), and an auxiliary assembly (12) capable of detecting micro leakage is arranged between the two extending plates.
7. The low vacuum tunnel seam micro leakage test apparatus according to claim 6, wherein: the auxiliary assembly (12) comprises two third gaskets (121) and two fourth gaskets (122), wherein the third gaskets (121) and the fourth gaskets (122) are all C-shaped with openings facing one side of the cover plate (1), the length of the fourth gaskets (122) is larger than that of the third gaskets (121) and sleeved outside the third gaskets (121), the two third gaskets (121) and the two fourth gaskets (122) are all placed on two sides of the center between the two extension plates (11) and are symmetrical relative to the center between the two extension plates (11), the first gaskets (3) and the second gaskets (4) close to one side of the supporting plate (2) are disconnected at the notch, the ends of the two third gaskets (121) close to the cover plate (2) are respectively fixedly connected with the ends of the first gaskets (3) close to the notch on two sides of the cover plate (2), and the ends of the second gaskets (3) close to the two sides of the notch are fixedly connected with the ends of the second gaskets (122) close to the cover plate (2).
8. The low vacuum tunnel seam micro leakage test apparatus of claim 7, wherein: the position that apron (2) was kept away from to extension board (11) is provided with auxiliary bolt (124), and auxiliary bolt (124) run through two extension boards (11) simultaneously, is provided with auxiliary nut (125) on auxiliary bolt (124), and one side that auxiliary nut (125) is close to extension board (11) is provided with pressure data acquisition instrument (126), is provided with second spacing nut (29) that use with auxiliary bolt (124) cooperation between two extension boards (11).
9. A test method using the low vacuum tunnel joint micro-leakage test apparatus according to any one of claims 1-8, characterized in that: the method comprises the following steps:
s1, assembling: assembling the test device;
s2, debugging: calculating initial contact pressure of contact surfaces of the two first gaskets (3) and the two second gaskets (4) to enable the contact pressure to be equal to the contact pressure of an actual working condition;
s3, state adjustment: tightening or loosening the pre-tightening nut (26) to enable the test device to be switched between a circular seam micro-leakage test state and a longitudinal seam micro-leakage test state;
s4, testing: and (3) vacuumizing the space among the first gasket (3), the cover plate (2) and the supporting plate (1), monitoring the data of the gas flowmeter (5), and ending the test after the monitoring period is 480 hours.
10. The test method according to claim 9, wherein: in the step S1, in the assembling process of the test device, if the micro leakage test of the circular seam and the longitudinal seam is synchronously carried out, the supporting plate (1) provided with the extension plate (11) and the cover plate (2) are required to be assembled together.
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| CN202310920095.8A CN116952483A (en) | 2023-07-24 | 2023-07-24 | Low-vacuum tunnel joint micro-leakage test device and test method thereof |
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| CN202310920095.8A CN116952483A (en) | 2023-07-24 | 2023-07-24 | Low-vacuum tunnel joint micro-leakage test device and test method thereof |
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