CN114486116A

CN114486116A - Mechanical seal air tightness detection tester

Info

Publication number: CN114486116A
Application number: CN202111682000.0A
Authority: CN
Inventors: 李迎春; 刘昌明; 刘鹏; 肖明红
Original assignee: Chengdu Chengao Technology Co ltd
Current assignee: Chengdu Chengao Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-13
Anticipated expiration: 2041-12-31
Also published as: CN114486116B

Abstract

The invention discloses a mechanical seal air tightness detection tester, which comprises a test cavity, wherein the test cavity is in a circular ring shape, a separation assembly is arranged in the test cavity and divides the test cavity into an upper cavity and a lower cavity which are respectively provided with an upper cavity and a lower cavity, the separation assembly comprises a fingertip sealing sheet fixing part, a fingertip sealing sheet and a rotating shaft simulation part, the fingertip sealing sheet fixing part is connected with the outer side wall of the test cavity, the fingertip sealing sheet is connected with the fingertip sealing sheet fixing part, the rotating shaft simulation part is connected with the inner side wall of the test cavity, the fingertip sealing sheet is sleeved outside the side wall of the rotating shaft simulation part, a fingertip beam of the fingertip sealing sheet is abutted against the rotating shaft simulation part, the test cavity also comprises an air inlet channel and an air outlet channel, the air inlet channel is communicated with one of the cavities, and the cavity is a cavity A, the air outlet channel is communicated with the other channel, and the cavity is a cavity B.

Description

Mechanical seal air tightness detection tester

Technical Field

The invention relates to the technical field of mechanical sealing, in particular to a mechanical sealing airtightness detection tester.

Background

Fingertip seal is a novel sealing technology that appears after castor tooth seal and brush seal, mainly be applied to aeroengine main bearing cavity and air current flow path seal, no matter indicate the optimal design of point seal or the manufacturing of fingertip seal piece, all need survey the performance parameter of gasket, for example, need survey its gas leakage volume for the working property of evaluation fingertip seal piece, just need survey the rate of rigidity and the hysteresis rate of gasket for exploring fingertip seal's hysteresis effect, to sum up, an urgent need for a detection frock, can detect the performance parameter of fingertip seal piece.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the object of the present invention is to: the mechanical seal air tightness detection tester can detect performance parameters of a fingertip sealing sheet.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a mechanical seal gas tightness detection test ware, includes the test chamber, the test chamber is the ring form, be provided with the partition subassembly in the test chamber, the partition subassembly will the test chamber is separated for two upper and lower cavities, goes up cavity, lower cavity respectively, the partition subassembly includes fingertip sealing piece fixed part, fingertip sealing piece, pivot analog component, fingertip sealing piece fixed part with the lateral wall in test chamber is connected, the fingertip sealing piece with fingertip sealing piece fixed part is connected, pivot analog component with the inside wall in test chamber is connected, the fingertip sealing piece cover is located outside the lateral wall of pivot analog component, its fingertip roof beam with pivot analog component butt still includes inlet channel, air outlet channel, inlet channel and one of them cavity intercommunication, this cavity is cavity A, air outlet channel and another passageway intercommunication, the chamber is chamber B.

Further, an air inlet buffer plate is arranged in the chamber A, and the air inlet buffer plate is over against an outlet of the air inlet channel.

Furtherly, pivot simulation part includes butt ring, top push part, the butt ring sets up in the test intracavity is ring shape structure, the butt ring with the inner wall sliding connection in test chamber, its removal orbit be on a parallel with the cross section in test chamber, the top push part set up in the butt ring with between the inside wall in test chamber, be used for the edge the radial outside of butt ring is pushed and is shoved the butt ring, the fingertip beam of gasket with the lateral wall butt of butt ring.

Further, the top pushes away the part and includes apical axis, hollow stand with the test chamber sets up with the axle center, sliding connection has one end lateral wall to be the dabber of the conical surface in the hollow stand, be provided with on the lateral wall of hollow stand with the through-hole that the apical axis corresponds, the one end of apical axis with the inner wall butt of butt ring, the other end of apical axis via the through-hole with the conical surface butt of dabber, the apical axis with test chamber sliding connection, the apical axis is followed the circumference array of butt ring sets up a plurality ofly.

Furthermore, an adjusting screw rod is rotatably arranged on the hollow upright post, the adjusting screw rod and the mandrel are coaxial, and the adjusting screw rod and the mandrel are connected through threads.

Further, the fingertip sealing disc fixing part comprises a switching seat and a supporting plate, a positioning boss A is arranged on the outer side wall of the testing cavity, the switching seat is connected with the positioning boss through a bolt, a positioning boss B is arranged on the switching seat, the supporting plate is connected with the positioning boss B through a bolt, and the fingertip sealing disc is connected with the supporting plate.

Furthermore, the test cavity includes two parallel arrangement's end panel, outer loop side wall board, inner ring side wall board, and two end panel intervals set up, outer loop side wall board, inner ring side wall board are connected with two end panels respectively.

Furthermore, the air inlet channel is provided with a cooling component, the cooling component comprises a vortex tube, the vortex tube comprises a vortex chamber, and a cold end tube and a hot end tube which are respectively positioned at two ends of the vortex chamber and communicated with the vortex chamber, an inlet of the vortex chamber is communicated with a high-pressure air source, and the cold end tube is communicated with the air inlet channel.

Further, still be provided with dry part on the inlet channel, dry part includes two toughness slats, be provided with the installation passageway on the inlet channel relatively, the toughness slat via the installation passageway set up in the installation passageway, two toughness slats be crooked form with inlet channel's inner wall laminating forms the circle column structure, be provided with ventilative filter screen on two terminal surfaces of circle column structure, ventilative filter screen, circle column structure enclose into holding the chamber, be provided with the drier in holding the chamber, be provided with the seal block in the installation passageway, the both ends of toughness slat respectively with two seal block butts.

Further, dry part still includes first part, first part includes the mobile jib, be provided with the extension part on the mobile jib symmetrically, extend the part and include pole A, pole B, the two respectively with mobile jib sliding connection, the end that pole A, pole B are relative is connected through buckling the pole, buckling the pole and including pole C, pole D, pole C's one end with pole A is articulated, pole D's one end with pole B is articulated, pole C, pole D are articulated each other, first part set up in the circle column structure, pole A, pole B respectively with the sealed piece butt of two installation passageways

Compared with the prior art, the invention has the following beneficial effects:

1. the partition subassembly will the test chamber is separated for upper and lower two cavities, simulates out the operating mode of fingertip seal piece during operation high-pressure side, low pressure side, and the rethread detects flow, the atmospheric pressure of the gas passage that two cavities correspond, just can judge the gaseous leakage rate of fingertip seal piece, and through removing dabber control the roof spindle stretches out/withdrawal can simulate fingertip seal piece during operation rotor runway operating mode, through measuring the moment that the butt ring produced just can detect the rigidity and the hysteresis rate of fingertip seal piece with and displacement, and the structure of this device is simple relatively, and reliable operation can satisfy the production and detect the demand, can be applied to the scientific research activity simultaneously.

Drawings

FIG. 1 is a structural diagram of a mechanical seal airtightness detection tester according to the present invention;

FIG. 2 is an internal view of a test chamber;

FIG. 3 is a view showing a structure of a drying part;

fig. 4 is a structure view of a cooling member.

List of reference numerals

1-test chamber, 2-processor, 3-torque sensor, 4-displacement sensor, 5-measuring transition plate, 6-cover plate, 7-adapter, 8-positioning boss A, 9-support plate, 10-fingertip sealing piece, 11-air inlet buffer plate, 12-support seat, 13-abutment ring, 14-top shaft, 15-slide seat, 16-hollow upright column, 17-mandrel, 18-adjusting screw, 19-flowmeter, 20-pressure gauge, 21-air inlet channel, 22-air outlet channel, 23-end plate, 24-outer ring side wall plate, 25-mounting channel, 26-sealing block, 27-toughness strip plate, 28-rod B, 29-rod A, 30-rod C, 31-rod D, 32-ventilating filter screen, 33-hot end pipe, 34-vortex chamber, 35-cold end pipe.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, integrally connected, or detachably connected; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art will understand the specific meaning of the above terms in the present invention in specific situations.

As shown in figures 1-2, the mechanical seal airtightness detection tester comprises a test cavity 1, wherein the test cavity 1 is in a circular ring shape, a separation component is arranged in the test cavity 1, the separation component separates the test cavity 1 into an upper cavity and a lower cavity, the upper cavity and the lower cavity are respectively arranged, the separation component comprises a fingertip sealing piece 10 fixing component, a fingertip sealing piece 10 and a rotating shaft simulation component, the fingertip sealing piece 10 fixing component is connected with the outer side wall of the test cavity 1, the fingertip sealing piece 10 is connected with the fingertip sealing piece 10 fixing component, the rotating shaft simulation component is connected with the inner side wall of the test cavity 1, the fingertip sealing piece 10 is sleeved outside the side wall of the rotating shaft simulation component, a fingertip beam of the fingertip sealing piece is abutted against the rotating shaft simulation component, the fingertip beam further comprises an air inlet channel 21 and an air outlet channel 22, and the air inlet channel 21 is communicated with one of the cavities, the chamber is a chamber a, the air outlet channel 22 is communicated with another channel, and the chamber is a chamber B. When detecting the leakage quantity of fingertip sealing piece 10, follow inlet channel 21 to let in compressed air in the cavity A, work as when fingertip sealing piece 10 takes place to leak, gaseous passing fingertip sealing piece 10 gets into among the cavity B, through detecting the flow and the atmospheric pressure of gas outlet channel 22 combustion gas can judge whether the leakage quantity of fingertip sealing piece 10 satisfies technical requirement, in this device, be provided with flowmeter 19 and manometer 20 on inlet channel 21, the exhaust passage respectively. Furthermore, the chamber A is provided with an air inlet buffer plate 11, the air inlet buffer plate 11 is right opposite to an outlet of the air inlet channel 21, and after the high-speed air collides with the air inlet buffer plate 11, the flow speed of the high-speed air is reduced, so that the chamber A can better simulate the working condition of the high-pressure side of the fingertip sealing piece 10.

Further, the fingertip sealing disc fixing part comprises an adapter 7 and a support plate 9, a positioning boss A8 is arranged on the outer side wall of the test cavity 1, the adapter 7 is connected with the positioning boss through a bolt, a positioning boss B is arranged on the adapter 7, the support plate 9 is connected with the positioning boss B through a bolt, and the fingertip sealing disc 10 is connected with the support plate 9. The positioning boss A8 and the positioning boss B respectively support and position the adapter 7 and the support plate 9, and are convenient to install.

Further, pivot analog component includes butt ring 13, top pushing part, butt ring 13 set up in the test chamber 1, be the ring form structure, butt ring 13 with the inner wall sliding connection of test chamber 1, its moving trajectory is on a parallel with the cross section of test chamber 1, top pushing part set up in butt ring 13 with between the inside wall of test chamber 1, be used for along butt ring 13 radially outwards push butt ring 13, the fingertip beam of fingertip sealing piece 10 with butt ring 13's lateral wall butt. The pivot simulation part can simulate the pivot when rotating the operating mode that the fingertip beam of pivot run-out extrusion fingertip sealing fin 10 takes place flexiplexion, through the top pushes away the outside top of part connects ring 13, surveys again connect ring 13's displacement, survey connect ring 13 production moment, the aforesaid leakage quantity isoparametric, just can calculate fingertip sealing fin 10's hysteresis rate, rate of rigidification judge it and satisfy technical requirement.

In this device, for the convenience measure the displacement and the moment of butt joint ring 13, be provided with on the butt joint ring 13 and measure excessive board 5, again, still include treater 2, displacement sensor 4, moment sensor 3 respectively with treater 2 electric connection, moment sensor 3, displacement sensor 4 are used for measuring respectively measure moment and the displacement that the cab apron produced. Be provided with apron 6, supporting seat 12 in the test chamber 1, the two interval sets up, butt ring 13 set up in between apron 6, the supporting seat 12, realize butt ring 13 with test chamber 1 sliding connection's purpose. The relevant programming codes, circuit diagrams and the like for receiving the data of the displacement sensor 4 and the torque sensor 3 through the processor 2 are disclosed in the prior art and are not described in detail herein.

For realizing the top push the purpose of butt ring 13, the top pushes away the part and includes apical axis 14, hollow stand 16 with 1 coaxial axle setting in test chamber, sliding connection has one end lateral wall to be the dabber 17 of the conical surface in hollow stand 16, be provided with on the lateral wall of hollow stand 16 with the through-hole that apical axis 14 corresponds, the one end of apical axis 14 with the inner wall butt of butt ring 13, the other end of apical axis 14 via the through-hole with the conical surface butt of dabber 17, apical axis 14 with 1 sliding connection in test chamber, apical axis 14 is followed the circumference array of butt ring 13 sets up a plurality ofly. Because the conical surfaces of the top shaft 14 and the mandrel 17 are abutted, the top shaft 14 can be controlled to extend or retract by moving the mandrel 17 along the hollow upright post 16, in order to improve the smoothness of the relative movement between the top shaft 14 and the mandrel 17, the abutted end of the top shaft 14 and the mandrel 17 is spherical, furthermore, an adjusting screw 18 is rotatably arranged on the hollow upright post 16, the adjusting screw 18 and the mandrel 17 are coaxial, and the adjusting screw 18 and the mandrel 17 are connected through threads. By turning the adjusting screw 18, the spindle 17 is moved along the hollow column 16 by the screw thread. The aim of sliding connection between the top shaft 14 and the test chamber 1 is achieved by arranging a sliding seat 15 in the test chamber 1.

Test chamber 1 both will satisfy the leakproofness well, and is convenient again the loading and unloading of fingertip sealing piece 10 to above-mentioned demand, test chamber 1 includes two parallel arrangement's end panel 23, outer loop side wall board 24, inner ring side wall board, and two end panel 23 intervals set up, outer loop side wall board 24, inner ring side wall board are connected with two end panels 23 respectively. In the present device, the inner ring side wall plate can be composed of the side wall of the hollow upright post 16, which can save part of the material, and two end plates 23 are respectively connected with the outer ring side wall plate 24 through bolts.

It is known that temperature has a very significant influence on the thermal deformation of the fingertip sealing piece, and further causes the leakage amount to change, for example, the higher the temperature is, the more obvious the thermal deformation of the fingertip sealing piece is, the larger the leakage amount is, and also, the gas viscosity has a certain influence on the deformation of the fingertip sealing piece, which may cause the deformation of the fingertip sealing piece to further increase, so that in the test process, in order to ensure the accuracy of the test result, a certain pretreatment needs to be performed on the gas introduced into the test cavity.

As shown in fig. 4, when a compressor in the prior art compresses gas, the temperature of the compressor is increased, in order to reduce the exhaust temperature of the compressor, a temperature reduction component is arranged on the air inlet channel, the temperature reduction component includes a vortex chamber 34, and a cold end pipe 35 and a hot end pipe 33 which are respectively located at two ends of the vortex chamber 34 and are communicated with the vortex chamber 34, an inlet of the vortex chamber 34 is communicated with a high pressure air source, and the cold end pipe 35 is communicated with the air inlet channel. Specifically, the high-pressure compressed gas is separated into cold and hot gas in the swirl chamber 34, the hot gas is discharged from the hot end pipe 33, and the cold air enters the air inlet passage from the cold end pipe 35, so that the purpose of cooling the high-temperature compressed gas is realized.

As shown in fig. 3, there is, to moisture gas again, still be provided with dry part on the inlet channel, dry part includes two toughness laths 27, be provided with installation passageway 25 on the inlet channel relatively, toughness lath 27 via installation passageway 25 set up in the installation passageway 25, two toughness laths 27 be the bending form with inlet channel's inner wall laminating forms the circle structure, be provided with ventilative filter screen 32 on two terminal surfaces of circle structure, ventilative filter screen 32, circle structure enclose into and hold the chamber, it is provided with the drier in the chamber to hold, be provided with seal block 26 in the installation passageway 25, the both ends of toughness lath 27 respectively with two seal block 26 butts. As is well known, the drying agent has a limited service life, and cannot perform a drying function again after moisture is adsorbed therein, and in view of the above problems in the prior art, the drying means has an advantage of facilitating replacement of the drying agent, and particularly, when the ductile metallic strip 27 is mounted, the sealing block 26 in one of the mounting channels 25 is removed, the ductile metallic strip 27 is inserted into the air intake channel, and further compressed to become bent into the aforementioned ring-like configuration, whereupon the desiccant is placed in the receiving chamber, and finally the extracted sealing block 26 is inserted therein to seal the air inlet passage, meanwhile, the sealing block 26 is abutted against the flexible lath 27 to enable the flexible lath to keep a deformation state, the two air-permeable filter screens 32 are respectively a windward side and a leeward side, and moisture in the water-containing gas is removed after the water-containing gas passes through the drying agent in the accommodating cavity. In the present device, large particles of desiccant are preferred to prevent the desiccant from leaking through the holes of the air permeable screen 32.

The flexible strip 27 can fix the position of the flexible strip with the air inlet channel through the part of the flexible strip in the mounting channel 25, and can improve the friction force between the flexible strip and the inner wall of the air inlet channel by arranging a friction layer on the contact surface of the flexible strip and the air inlet channel to fix the relative position.

When the desiccant needs to be replaced, the sealing block 26 in the mounting channel 25 is removed so that the desiccant in the receiving cavity can escape, and with the reduction of the desiccant, the flexible strip 27 can be removed to facilitate cleaning thereof. As shown in fig. 3, the installation channel 25 can be vertically disposed, when the flexible strip 27 is put in, the drying agent can be conveniently put in from the installation channel 25 above, and when the flexible strip 27 is taken out, the drying agent can be conveniently discharged from the installation channel 25 below.

When compressing the tough laths 27, it is possible that both tough laths 27 are bent towards the same side, and therefore, the drying component further includes a primary support member, the primary support member includes a primary rod, a spreading member is symmetrically disposed on the primary rod, the spreading member includes a rod a29 and a rod B28, both of which are slidably connected to the primary rod, the opposite ends of the rods a29 and B28 are connected by a bent rod, the bent rod includes a rod C30 and a rod D31, one end of the rod C30 is hinged to the rod a29, one end of the rod D31 is hinged to the rod B28, the rods C30 and D31 are hinged to each other, the primary support member is disposed in the ring structure, and the rods a29 and B28 are respectively abutted to the sealing blocks 26 of the two installation channels 25. In the process of compressing the flexible strips 27, the rods a29 and B28 are first controlled to move toward the middle of the main rod, and further the rods C30 and D31 are pressed so that the distance from the hinged ends to the main rod gradually increases, and then the flexible strips 27 are compressed to avoid the situation that the two flexible strips 27 bend toward the same side.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the embodiments in the above description, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications all belong to the protection scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The utility model provides a mechanical seal gas tightness detection test ware which characterized in that: including testing chamber (1), testing chamber (1) is the ring form, be provided with the partition subassembly in testing chamber (1), the partition subassembly will testing chamber (1) is separated for two upper and lower cavities, goes up cavity, lower cavity respectively, the partition subassembly includes fingertip gasket (10) fixed part, fingertip gasket (10), pivot analog part, fingertip gasket (10) fixed part with the lateral wall of testing chamber (1) is connected, fingertip gasket (10) with fingertip gasket (10) fixed part is connected, pivot analog part with the inside wall of testing chamber (1) is connected, fingertip gasket (10) cover is located outside the lateral wall of pivot analog part, its fingertip roof beam with pivot analog part butt still includes inlet channel (21), outlet channel (22), inlet channel (21) and one of them cavity intercommunication, the cavity is a cavity A, the air outlet channel (22) is communicated with the other channel, and the cavity is a cavity B.

2. The mechanical seal airtightness detection tester according to claim 1, wherein: an air inlet buffer plate (11) is arranged in the cavity A, and the air inlet buffer plate (11) is over against an outlet of the air inlet channel (21).

3. The mechanical seal airtightness detection tester according to claim 1, wherein: pivot simulation part includes butt ring (13), top pushing part, butt ring (13) set up in test chamber (1) is the ring form structure, butt ring (13) with the inner wall sliding connection of test chamber (1), its moving trajectory be on a parallel with the cross section of test chamber (1), top pushing part set up in butt ring (13) with between the inside wall of test chamber (1), be used for along the radial outside pushing of butt ring (13) is crowded butt ring (13), the fingertip roof beam of fingertip gasket (10) with the lateral wall butt of butt ring (13).

4. The mechanical seal airtightness detection tester according to claim 3, wherein: the top pushes away the part and includes apical axis (14), hollow stand (16) with test chamber (1) sets up with the axle center, sliding connection has dabber (17) that one end lateral wall is the conical surface in hollow stand (16), be provided with on the lateral wall of hollow stand (16) with the through-hole that apical axis (14) corresponds, the one end of apical axis (14) with the inner wall butt of butt ring (13), the other end via of apical axis (14) the through-hole with the conical surface butt of dabber (17), apical axis (14) with test chamber (1) sliding connection, apical axis (14) are followed the circumference array of butt ring (13) sets up a plurality ofly.

5. The mechanical seal airtightness detection tester according to claim 4, wherein: the hollow upright post (16) is further rotatably provided with an adjusting screw rod (18), the adjusting screw rod (18) and the mandrel (17) are coaxial, and the adjusting screw rod (18) is connected with the mandrel (17) through threads.

6. The mechanical seal airtightness detection tester according to claim 1, wherein: fingertip seal disc fixed part includes adapter (7), backup pad (9), be provided with location boss A (8) on the lateral wall in test chamber (1), adapter (7) with the location boss passes through bolted connection, be provided with location boss B on adapter (7), backup pad (9) with location boss B passes through bolted connection, fingertip gasket (10) with backup pad (9) are connected.

7. The mechanical seal airtightness detection tester according to claim 6, wherein: the test chamber (1) includes two parallel arrangement's end panel (23), outer loop side wall board (24), inner ring side wall board, and two end panel (23) intervals set up, outer loop side wall board (24), inner ring side wall board are connected with two end panel (23) respectively.

8. The mechanical seal airtightness detection tester according to claim 1, wherein: the air inlet passage is provided with a cooling component, the cooling component comprises a vortex tube, the vortex tube comprises a vortex chamber (34), and a cold end tube (35) and a hot end tube (33) which are respectively positioned at two ends of the vortex chamber (34) and communicated with the vortex chamber (34), the inlet of the vortex chamber (34) is communicated with a high-pressure air source, and the cold end tube (35) is communicated with the air inlet passage.

9. The mechanical seal airtightness detection tester according to claim 1, wherein: still be provided with dry part on the inlet channel, dry part includes two toughness laths (27), be provided with installation passageway (25) on the inlet channel relatively, toughness lath (27) via installation passageway (25) set up in installation passageway (25), two toughness laths (27) be crooked form with inlet channel's inner wall laminating forms circle column structure, be provided with ventilative filter screen (32) on two terminal surfaces of circle column structure, ventilative filter screen (32), circle column structure enclose into holding the chamber, it is provided with the drier in the chamber to hold, be provided with seal block (26) in installation passageway (25), the both ends of toughness lath (27) respectively with two seal block (26) butts.

10. The mechanical seal airtightness detection tester according to claim 9, wherein: the dry part still includes first branch part, first branch part includes the mobile jib, be provided with the extension part on the mobile jib symmetrically, extend the part including pole A (29), pole B (28), the two respectively with mobile jib sliding connection, pole A (29), the relative end of pole B (28) are connected through buckling the pole, buckling the pole and including pole C (30), pole D (31), the one end of pole C (30) with pole A (29) are articulated, the one end of pole D (31) with pole B (28) are articulated, pole C (30), pole D (31) are articulated each other, first branch part set up in among the circle column structure, pole A (29), pole B (28) respectively with sealed piece (26) butt of two installation passageways (25).