A sealing performance testing device for an air inflation cabinet

Abstract

The application discloses a sealing performance testing device for an inflation cabinet, and particularly relates to the technical field of sealing detection. The sealing performance testing device for the inflation cabinet comprises a detection seat, a sealing and clamping assembly, a protruding part, a pipe joint, and a driving column. When the air pressure in the inner cavity of the insulation air chamber is less than the air pressure in the inner cavity of the detection seat, the driving column will move linearly towards the outer side of the detection seat. A displacement detection assembly is arranged for the linear motion stroke of the driving column. In the application, during the inflation process of the inner cavity of the insulation air chamber, the air pressure of the insulation air chamber gradually approaches the delivery pressure of the compressed gas, so that the driving column moves towards the outer side of the detection seat, the displacement detection assembly triggers an action, and the displacement of the driving column can be detected. After the inflation is completed, when the displacement signal is detected, it indicates that the insulation air chamber has a leakage. If there is no displacement signal, it indicates that the insulation air chamber has no leakage point, that is, the sealing performance of the insulation air chamber is good.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing detection, and in particular relates to a sealing performance testing device for an inflatable cabinet. Background Art

[0002] Gas-insulated metal-enclosed switchgear (C-GIS), also known as gas-insulated metal-enclosed switchgear, is a type of high-voltage power distribution equipment that encloses high-voltage components (such as circuit breakers and disconnectors) within a box-shaped container filled with insulating gas. C-GIS utilizes an insulating gas (such as sulfur hexafluoride (SF6), nitrogen, or air) to provide insulation and protection, ensuring safe operation under both normal and fault conditions.

[0003] The insulating air chamber of the inflatable cabinet is required to be sealed. Therefore, during the production process or use, the sealing of the insulating air chamber needs to be tested. For example, a gas filling cabinet and a vacuum detection device thereof are disclosed in Chinese patent publication number CN116937409A. The present invention relates to the field of gas filling cabinet technology. The inflatable cabinet and its vacuum detection device include an inflatable cabinet, a pipe is installed on the side wall of the inflatable cabinet, a detection box is connected to the outer wall of one side of the pipe, a sealing component is provided on the side wall of the inflatable cabinet, and the sealing component includes a rubber pad, a piston 1, and a sliding rod 1. The outer wall of one side of the rubber pad is installed on the inner wall of the inflatable cabinet, the outer wall of the piston 1 is installed on the inner wall of the inflatable cabinet, the outer wall of one side of the piston 1 is connected to one end of the sliding rod 1, and the outer wall of one side of the sliding rod 1 is installed on the inner wall of the inflatable cabinet. By controlling the piston 2, the gas in the inflatable cabinet is sucked into the detection chamber through the pipe, thereby sampling the gas components in the inflatable cabinet. The method is simple and convenient, and only needs to be controlled by the console to start the motor and select the corresponding electromagnet to be energized as needed. It is easy to operate.

[0004] In the above-mentioned prior art, the gas in the compartment of the gas filling cabinet is pumped into the detection chamber through a pipeline. After the gas is pumped into the detection chamber, the solenoid valve is opened to allow the gas in the detection chamber to be transported to the detector through a delivery pipe. The detector analyzes the components in these gases to see whether the gas contains only sulfur hexafluoride gas. If it contains components in the air, the surface vacuum seal fails. That is, the above-mentioned prior art uses a gas component detection method to detect whether there is impurity gas in the sulfur hexafluoride gas, and then to determine the sealing performance of the gas filling cabinet. Although this method is more accurate, it takes a long time before and after the detection, and has high requirements on the experience of the staff, etc., and cannot be adapted to large-scale detection. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a sealing performance testing device for an inflatable cabinet.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] A sealing performance testing device for an inflatable cabinet includes a detection seat installed in a cable threading hole provided in an insulating gas chamber shell of the inflatable cabinet, and further includes:

[0008] A sealing clamping assembly installed at one end of the detection seat, the sealing clamping assembly is used to install the detection seat in the cable threading hole and make the inner cavity of the insulating air chamber communicate with the inner cavity of the detection seat;

[0009] A protrusion and a pipe interface fixedly connected to the outer wall of the detection seat, the pipe interface being connected to an external compressed gas system, the protrusion being hollow inside and open at one end away from the detection seat;

[0010] a driving post coaxially and slidably disposed in the inner cavity of the protrusion, wherein the driving post moves linearly toward the outer side of the detection seat when the air pressure in the inner cavity of the insulating air chamber is lower than the air pressure in the inner cavity of the detection seat;

[0011] A displacement detection component is provided on the protruding portion, and the displacement detection component is used for the linear motion stroke of the driving column.

[0012] Through the above technical solution, the detection seat is installed on the insulating air chamber shell by the sealing clamping component, and the cable threading hole of the insulating air chamber is connected to the insulating air chamber, and then the compressed gas is delivered to the detection seat by the external compressed gas delivery system, and then the compressed gas enters the insulating air chamber from the detection seat, so that the air pressure in the insulating air chamber gradually becomes consistent with the pressure of the compressed gas delivery, and in the process of inflating the inner cavity of the insulating air chamber, the air pressure of the insulating air chamber gradually approaches the compressed gas delivery pressure, so that the driving column will move toward the outside of the detection seat, the displacement detection component triggers the action, and can detect the displacement of the driving column. After the inflation is completed, when the displacement signal is detected, it indicates that the insulating air chamber has a leak. If there is no displacement signal, it means that there is no leakage point in the insulating air chamber, that is, the insulating air chamber has good sealing performance, does not require high work experience, and is suitable for large-scale testing.

[0013] Furthermore, the displacement detection assembly includes a pressure sensor fixedly mounted on the mouth of the protrusion, a hollow rubber column is bonded to one end of the driving column facing radially outward of the detection seat, and the end of the hollow rubber column away from the driving column is abutted and connected to the surface of the pressure sensor.

[0014] Through the above technical solution, when the driving column produces linear motion toward the outside of the detection seat, the driving column will drive the hollow rubber column to move, and the end face of the hollow rubber column will press against the pressure sensor, causing the pressure sensor to generate a pressure signal, and the pressure signal is fed back to the external control cabinet.

[0015] Furthermore, a floating component is provided in the inner cavity of the detection seat, and the floating component is used to drive the driving column to move toward the outer side of the detection seat when the air pressure in the inner cavity of the detection seat is greater than the air pressure in the inner cavity of the insulating air chamber.

[0016] Through the above technical solution, the floating assembly drives the driving column to move toward the outside of the detection seat, thereby causing the hollow rubber column to press against the pressure sensor.

[0017] Furthermore, the floating assembly includes a fixed plug coaxially fixedly installed in the inner cavity of the detection seat, and a rotating column is coaxially passed through the end face of the fixed plug. The rotating column rotates freely on the fixed plug, and a gear portion is provided on the periphery of one end of the rotating column, and a rack portion is provided on the periphery of the driving column for meshing with the gear portion for transmission, and the fixed plug is provided with a rotating unit for driving the rotating column to rotate.

[0018] Through the above technical solution, the rotating unit can drive the rotating column to rotate. When the rotating column rotates, the rack part and the gear part are engaged and transmitted, thereby enabling the driving column to move along the radial direction of the detection seat.

[0019] Furthermore, the rotating unit includes a fixed sleeve fixedly embedded in the fixed plug, the fixed sleeve is provided with a sliding hole for the rotating column to pass freely, two balls are rotatably embedded in the hole wall of the sliding hole, and the periphery of the rotating column is provided with a spiral rolling groove for the balls to engage and roll freely.

[0020] Through the above technical solution, when the rotating column moves in the direction away from the fixed plug, the ball will roll in the spiral rolling groove, and the rotating column will be able to rotate. When the rotating column rotates, the gear part and the rack part will engage and transmit.

[0021] Furthermore, the end of the rotating column away from the gear part is coaxially connected to a floating plug, the end surface of the floating plug is fixed with multiple sealing parts, and the end surface of the fixed plug is provided with a sealing groove for corresponding insertion of the sealing parts.

[0022] Through the above technical solution, during the process of inflating the inner cavity of the insulating air chamber shell, the air pressure in the inner cavity of the insulating air chamber shell is lower than the air pressure in the inner cavity of the detection seat, so that the gas in the inner cavity of the detection seat generates a thrust on the sealing part, so that the sealing part drives the floating plug to move in the direction away from the fixed plug. When the sealing part is out of engagement with the sealing groove, the inner cavity of the detection seat will be connected with the inner cavity of the insulating air chamber, thereby enabling the gas compression system to transport the compressed gas into the insulating air chamber. When the air pressure in the inner cavity of the detection seat is consistent with the air pressure in the inner cavity of the insulating air chamber, the gas thrust on the sealing part disappears.

[0023] Furthermore, a reset spring is installed in the inner cavity of the detection seat, and two ends of the reset spring in the elastic force direction elastically press against the end surface of the floating plug and the inner cavity wall of the detection seat respectively.

[0024] Through the above technical solution, when the air pressure in the inner cavity of the detection seat is consistent with the air pressure in the inner cavity of the insulating air chamber, the gas thrust on the sealing part disappears. At this time, the elastic potential energy accumulated by the reset spring is released, so that the floating plug drives the sealing part to move toward the fixed plug, so that the sealing part can be re-engaged in the sealing groove, so that the rotating column rotates in the opposite direction. When the rotating column rotates in the opposite direction, the gear part and the rack part will engage in reverse transmission, thereby causing the drive column to move in the direction away from the pressure sensor, thereby causing the pressure signal of the pressure sensor to disappear. At this time, it can be determined that the air pressure in the inner cavity of the detection seat and the inner cavity of the insulating air chamber are consistent.

[0025] Furthermore, the sealing clamping assembly includes a cylindrical portion coaxially connected to the end of the detection seat away from the pipe interface, the periphery of the cylindrical portion is slidably fitted with a tightening portion, the end face of the tightening portion is coaxially fixed with a clamping portion, the axial thickness dimension of the clamping portion matches the thickness dimension of the insulating air chamber shell, the clamping portion is provided with a sealing unit, the tightening portion is fixed with a mounting plate through multiple columns, the mounting plate is installed with a cylinder, and the cylinder rod of the cylinder is connected to the detection seat.

[0026] Through the above technical solution, the cylinder rod of the cylinder is shortened, thereby driving the detection seat to move away from the insulating air chamber, causing the volume of the sealing unit to expand and blocking the gap between the cable hole and the outer wall of the cylindrical part, so that the clamping part and the cable hole have better sealing.

[0027] Furthermore, the sealing unit includes an extrusion portion coaxially fixed to an end of the cylindrical portion away from the detection seat, and a rubber airbag is provided between the extrusion portion and the opposite end of the clamping portion.

[0028] Through the above technical solution, when the detection seat moves in the direction away from the pressing part, the extrusion part and the clamping part produce relative movement, thereby squeezing the rubber airbag, causing the rubber airbag to expand and deform, and causing the rubber airbag to block the gap between the cable hole and the clamping part, so as to increase the sealing of the clamping part and the insulating air chamber.

[0029] Furthermore, the clamping portion is coaxially fixed with a conical portion at one end toward the extrusion portion, and the outer diameter of the conical portion decreases successively in the direction away from the clamping portion. The end face of the extrusion portion is fixed with an expansion portion, and the expansion portion is provided with a conical groove for use with the conical portion, and the extrusion portion and the cylindrical portion are provided with deformation seams.

[0030] Through the above technical solution, when the extrusion part moves toward the clamping part, the conical part will be clamped into the conical groove. In addition, since the extrusion part and the cylindrical part are provided with deformation seams, the extrusion part will produce elastic expansion deformation, and the periphery of the extrusion part will produce extension deformation toward its radial outside, so that the extrusion part can press the rubber airbag in the extended and deformed state toward one end face of the clamping part, so that the rubber airbag can press the surface of the insulating air chamber to improve the sealing performance of the rubber airbag between the insulating air chamber and the clamping part.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. In the present invention, the detection seat is installed on the insulating air chamber shell by a sealing clamping assembly, and the cable threading hole of the insulating air chamber is connected to the insulating air chamber. The compressed gas is then delivered to the detection seat by an external compressed gas delivery system, and then enters the insulating air chamber from the detection seat, so that the air pressure in the insulating air chamber gradually becomes consistent with the compressed gas delivery pressure. In the process of inflating the inner cavity of the insulating air chamber, the air pressure of the insulating air chamber gradually approaches the compressed gas delivery pressure, thereby causing the driving column to move toward the outside of the detection seat, triggering the displacement detection assembly to operate and detect the displacement of the driving column. After inflation is completed, when a displacement signal is detected, it indicates that the insulating air chamber has a leak. If there is no displacement signal, it indicates that there is no leak point in the insulating air chamber. That is, the insulating air chamber has good sealing performance, does not require high working experience, and is suitable for large-scale testing.

[0033] 2. In the present invention, during the process of inflating the inner cavity of the insulating air chamber shell, the air pressure in the inner cavity of the insulating air chamber shell is lower than the air pressure in the inner cavity of the detection seat, so that the gas in the inner cavity of the detection seat generates a thrust on the sealing portion, causing the sealing portion to drive the floating plug to move away from the fixed plug. When the sealing portion is disengaged from the sealing groove, the inner cavity of the detection seat will be connected to the inner cavity of the insulating air chamber, thereby enabling the gas compression system to transport compressed gas into the insulating air chamber. When the air pressure in the inner cavity of the detection seat is consistent with the air pressure in the inner cavity of the insulating air chamber, the gas thrust on the sealing portion disappears.

[0034] 3. In the present invention, when the air pressure in the inner cavity of the detection seat is consistent with the air pressure in the inner cavity of the insulating air chamber, the gas thrust on the sealing portion disappears. At this time, the elastic potential energy accumulated by the reset spring is released, causing the floating plug to drive the sealing portion toward the fixed plug, allowing the sealing portion to be re-engaged in the sealing groove, thereby causing the rotating column to rotate in the opposite direction. When the rotating column rotates in the opposite direction, the gear portion and the rack portion engage in reverse transmission, thereby causing the driving column to move in a direction away from the pressure sensor, thereby causing the pressure signal of the pressure sensor to disappear. At this time, it can be determined that the air pressure in the inner cavity of the detection seat and the inner cavity of the insulating air chamber are consistent;

[0035] 4. In the present invention, when the detection seat moves in the direction away from the pressing part, the extrusion part and the clamping part produce relative movement, thereby squeezing the rubber airbag, thereby causing the rubber airbag to expand and deform, and the rubber airbag blocks the gap between the cable hole and the clamping part to increase the sealing of the clamping part and the insulating air chamber. When the extrusion part moves toward the clamping part, the cone part will be stuck in the cone groove. In addition, since the extrusion part and the cylindrical part are provided with a deformation seam, the extrusion part will produce elastic expansion deformation, thereby causing the periphery of the extrusion part to produce expansion deformation toward its radial outside, so that the extrusion part can press the rubber airbag in the expanded and deformed state on one end face of the clamping part, so that the rubber airbag can press the surface of the insulating air chamber to improve the sealing performance of the rubber airbag between the insulating air chamber and the clamping part. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the overall structure of a sealing performance testing device for an inflatable cabinet in the present invention;

[0037] Figure 2 yes Figure 1 The schematic diagram of the positional relationship after the inflatable cabinet and the insulating gas chamber are omitted;

[0038] Figure 3 yes Figure 2 Schematic diagram of the exploded structure;

[0039] Figure 4 yes Figure 2 Schematic diagram of explosion decomposition from the first perspective;

[0040] Figure 5 yes Figure 2 Schematic diagram of the positional relationship of the second perspective;

[0041] Figure 6 yes Figure 5 Schematic diagram of the positional relationship of some structures after being cut open from another perspective;

[0042] Figure 7 yes Figure 6 A magnified schematic diagram of the local structure at point A;

[0043] Figure 8 yes Figure 6 A magnified schematic diagram of the local structure at point B in the middle;

[0044] Figure 9 This is a schematic diagram of the positional relationship among the cylindrical portion, the extrusion portion, and the expansion portion after assembly in the present invention;

[0045] Figure 10 yes Figure 9 Schematic diagram of the positional relationship from another perspective.

[0046] Figure numerals: 1. Insulating air chamber; 2. Inflatable cabinet; 3. Detection seat; 4. Conical groove; 5. Cylinder; 6. Mounting plate; 7. Protrusion; 8. Pressure sensor; 9. Column; 10. Tightening part; 11. Threaded section; 12. Rubber airbag; 13. Extrusion part; 14. Inflating hole; 15. Expansion part; 16. Columnar part; 17. Conical part; 18. Clamping part; 19. Return spring; 20. Floating plug; 21. Sealing part; 22. Fixed plug; 23. Sealing groove; 24. Fixed sleeve; 25. Spiral rolling groove; 26. Rotating column; 27. Gear part; 28. Drive column; 29. ​​Hollow rubber column; 30. Rack part; 31. Pipe interface; 32. Deformation joint. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] like Figures 1-10 As shown, this embodiment provides: a sealing performance testing device for an inflatable cabinet, the device is used to perform sealing detection on the insulating air chamber 1 of the inflatable cabinet 2, the shell of the insulating air chamber 1 is provided with at least one cable threading hole for cable installation, the detection device includes a clamping portion 18 installed in the cable threading hole provided on the shell of the insulating air chamber 1 of the inflatable cabinet 2, the diameter of the clamping portion 18 matches the inner diameter of the cable threading hole, so that the clamping portion 18 can be clamped into the cable threading hole, and the axial length of the clamping portion 18 matches the inner diameter of the cable threading hole. The outer shell of the insulating air chamber 1 has the same thickness and size. In addition, the clamping portion 18 is coaxially fixed with a tightening portion 10 on one end face corresponding to the outer side of the insulating air chamber 1. The end face of the tightening portion 10 is in contact with the outer surface of the insulating air chamber 1. Two columns 9 are vertically fixed to the end face of the tightening portion 10. One end of the two columns 9 away from the tightening portion 10 is fixed with a mounting plate 6. A cylinder 5 is mounted on the surface of the mounting plate 6. The cylinder rod of the cylinder 5 slides through the mounting plate 6. The cylinder rod of the cylinder 5 is driven and connected to the detection seat 3. The interior of the detection seat 3 is hollow.

[0049] The end face of the detection seat 3 coaxially fixed with the cylindrical part 16 towards the insulating air chamber 1 is provided with a through hole type inflation hole 14, the surface of the cylindrical part 16 is provided with a threaded section 11, the threaded section 11 is threadedly connected with the detection seat 3, in addition, the cylindrical part 16 coaxially penetrates the clamping part 18, the cylindrical part 16 freely slides in the hole of the clamping part 18, in addition, the end of the cylindrical part 16 away from the detection seat 3 is coaxially fixed with the extrusion part 13, the outer diameter size of the extrusion part 13 is the same with the outer diameter size of the clamping part 18, in addition, an annular mounting groove is surrounded between the opposite ends of the extrusion part 13 and the clamping part 18, the rubber air bag 12 is clamped and mounted in the annular mounting groove, the inside of the rubber air bag 12 is filled with inert gas with a fixed pressure, in addition, the end face of the clamping part 18 towards the extrusion part 13 is coaxially fixed with the taper part 17, the outer diameter size of the taper part 17 gradually decreases in the direction away from the clamping part 18, the end face of the extrusion part 13 towards the clamping part 18 is coaxially fixed with the expansion part 15, the expansion part 15 is provided with a taper groove 4, the taper groove 4 is used in cooperation with the taper part 17, in addition, the periphery of the extrusion part 13, the cylindrical part 16 and the expansion part 15 is provided with a deformation seam 32 penetrating the inflation hole 14, through the setting of the deformation seam 32, when the expansion part 15 is subjected to radial force, the expansion part 15 will produce elastic expansion deformation, and then the extrusion part 13 produces elastic expansion deformation, and the periphery of the extrusion part 13 produces extension deformation to the radial outside thereof;

[0050] When the cylinder rod of the air cylinder 5 is shortened, the detection seat 3 will be driven to move away from the abutting part 10, the cylindrical part 16 drives the extrusion part 13 to move towards the air cylinder 5, the extrusion part 13 will move towards the clamping part 18, the extrusion part 13 and the clamping part 18 will extrude the rubber air bag 12, the rubber air bag 12 produces extension deformation, the rubber air bag 12 can fill the gap between the cylindrical part 16 and the cable penetrating hole, and the sealing effect of the cable penetrating hole and the outer wall of the cylindrical part 16 is better, in addition, the taper part 17 slides in the taper groove 4 of the expansion part 15, and extrudes the expansion part 15 along the radial outside thereof, and then the expansion part 15 produces elastic expansion deformation, the extrusion part 13 produces elastic expansion deformation, and then the periphery of the extrusion part 13 produces extension deformation to the radial outside thereof, so that the extrusion part 13 can extrude the rubber air bag 12, and the filling effect of the rubber air bag 12 to the gap between the clamping part 18 and the cable penetrating hole is better;

[0051] The outer wall of the detection seat 3 is provided with a pipe interface 31, which is connected to the external compressed gas delivery system through a pipeline. The external compressed gas delivery system delivers compressed gas of fixed pressure to the pipe interface 31, and then enters the detection seat 3. In addition, the outer wall of the detection seat 3 is integrally formed with a protrusion 7 fixedly connected, and the protrusion 7 extends radially outward from the detection seat 3. In addition, the protrusion 7 is hollow inside and open at one end away from the detection seat 3. A driving column 28 is coaxially slidably penetrated in the protrusion 7, and a hollow rubber column 29 is bonded to an end surface of the driving column 28 facing the radial outer side of the detection seat 3. A pressure sensor 8 is fixedly installed at the mouth of the protrusion 7. The pressure sensor 8 is electrically connected to an external control cabinet through a cable or a wireless transmission module. The end of the hollow rubber column 29 away from the driving column 28 is in contact with the surface of the pressure sensor 8. When the driving column 28 moves toward the radial outer side of the detection seat 3, the hollow rubber column 29 will generate an extrusion force on the pressure sensor 8, so that the pressure sensor 8 generates a pressure signal, and the pressure signal is fed back to the external control cabinet;

[0052] A fixed plug 22 is coaxially and fixedly installed in the inner cavity of the detection seat 3, and a rotating column 26 is coaxially penetrated by the end face of the fixed plug 22. The rotating column 26 rotates freely on the fixed plug 22, and a gear portion 27 is provided on the periphery of one end of the rotating column 26, and a rack portion 30 is provided on the periphery of the driving column 28 for transmission in meshing with the gear portion 27. A fixed sleeve 24 is coaxially and fixedly embedded in the fixed plug 22, and a sliding hole is provided in the fixed sleeve 24 for free passage of the rotating column 26. Two balls (not shown in the figure) are rotatably embedded in the hole wall of the sliding hole, and a spiral rolling groove 25 is provided on the periphery of the rotating column 26 for engagement of the balls and free rolling. When the rotating column 26 slides on the fixed plug 22, the rotating column 26 and the fixed sleeve 24 will produce relative motion, and the balls will roll in the spiral rolling groove 25, thereby causing the rotating column 26 to rotate, thereby driving the gear portion 27 and The rack portion 30 is meshed for transmission. When the gear portion 27 and the rack portion 30 are meshed for transmission, the driving column 28 will generate radial movement along the detection seat 3. The end of the rotating column 26 away from the gear portion 27 is coaxially connected to the floating plug 20. The end face of the floating plug 20 is fixedly connected with multiple sealing portions 21. The end face of the fixed plug 22 is provided with a sealing groove 23 for the sealing portion 21 to be correspondingly inserted. A return spring 19 is installed in the inner cavity of the detection seat 3. The two ends of the return spring 19 in the elastic direction elastically press against the end face of the floating plug 20 and the inner cavity wall of the detection seat 3 respectively. In addition, a rubber layer is provided on the surface of the sealing portion 21. In this way, after the sealing portion 21 is inserted into the sealing groove 23, the sealing effect of the sealing portion 21 and the sealing groove 23 is better. Furthermore, after the sealing portion 21 is inserted into the sealing groove 23, the gas in the insulating air chamber 1 will not enter the detection seat 3 from the gap between the sealing groove 23 and the sealing portion 21.

[0053] During the process of inflating the inner cavity of the shell of the insulating air chamber 1, the air pressure in the inner cavity of the shell of the insulating air chamber 1 is lower than the air pressure in the inner cavity of the detection seat 3, so that the gas in the inner cavity of the detection seat 3 generates a thrust on the sealing portion 21, so that the sealing portion 21 drives the floating plug 20 to move in the direction away from the fixed plug 22. When the sealing portion 21 is out of engagement with the sealing groove 23, the inner cavity of the detection seat 3 will be connected with the inner cavity of the insulating air chamber 1, thereby enabling the gas compression system to transport the compressed gas into the insulating air chamber 1. When the air pressure in the inner cavity of the detection seat 3 is consistent with the air pressure in the inner cavity of the insulating air chamber 1, the gas thrust on the sealing portion 21 disappears, and when the air pressure in the inner cavity of the detection seat 3 is equal to that in the inner cavity of the insulating air chamber 1, the gas thrust on the sealing portion 21 disappears. When the air pressure is consistent with the air pressure in the inner cavity of the insulating air chamber 1, the gas thrust on the sealing part 21 disappears. At this time, the elastic potential energy accumulated by the reset spring 19 is released, so that the floating plug 20 drives the sealing part 21 to move toward the fixed plug 22, so that the sealing part 21 can be re-engaged in the sealing groove 23, so that the rotating column 26 rotates in the opposite direction. When the rotating column 26 rotates in the opposite direction, the gear part 27 and the rack part 30 will engage in reverse transmission, thereby causing the driving column 28 to move in the direction away from the pressure sensor 8, thereby causing the pressure signal of the pressure sensor 8 to disappear. At this time, it can be determined that the air pressure in the inner cavity of the detection seat 3 and the inner cavity of the insulating air chamber 1 are consistent.

[0054] The working principle of this embodiment is as follows:

[0055] In the initial state, the cylinder rod of the cylinder 5 is in an extended state. At this time, the extrusion force exerted on the cone portion 17 by the inner wall of the cone groove 4 is small or not exerted at all. As a result, the extrusion portion 13 does not undergo elastic expansion deformation. Moreover, the distance between the extrusion portion 13 and the clamping portion 18 is large. The rubber airbag 12 is not squeezed by the extrusion portion 13 and the clamping portion 18. At this time, the rubber airbag 12 does not undergo extension deformation. As a result, the rubber airbag 12 and the clamping portion 18 can be smoothly inserted into the cable threading hole of the insulating air chamber 1.

[0056] When the cylinder 5 is started, the cylinder rod of the cylinder 5 is shortened, so that the detection seat 3 can move toward the mounting plate 6 or the cylinder 5, and then the detection seat 3 drives the columnar portion 16 to move toward the mounting plate 6, and the extrusion portion 13 will move toward the clamping portion 18, so that the extrusion portion 13 and the clamping portion 18 will squeeze the rubber airbag 12, causing the rubber airbag 12 to expand and deform. The rubber airbag 12 can fill the gap between the columnar portion 16 and the cable hole, and make the sealing effect of the cable hole and the outer wall of the columnar portion 16 more effective. Preferably, the conical portion 17 slides in the conical groove 4 of the expansion portion 15 and generates an extrusion force on the expansion portion 15 along its radial outer side, thereby causing the expansion portion 15 to elastically expand and deform, causing the extrusion portion 13 to elastically expand and deform, thereby causing the periphery of the extrusion portion 13 to extend and deform radially outward, so that the extrusion portion 13 can squeeze the rubber airbag 12, so that the rubber airbag 12 has a better filling effect on the gap between the clamping portion 18 and the cable threading hole. At this time, the detection seat 3 is connected to the cable threading hole;

[0057] The external compressed gas delivery system is started. The external compressed gas delivery system delivers compressed gas of a fixed pressure to the pipe interface 31, and then to the inner cavity of the detection seat 3. At this time, during the process of inflating the inner cavity of the outer shell of the insulating air chamber 1, the air pressure in the inner cavity of the outer shell of the insulating air chamber 1 is lower than the air pressure in the inner cavity of the detection seat 3, so that the gas in the inner cavity of the detection seat 3 generates a thrust on the sealing portion 21, so that the sealing portion 21 drives the floating plug 20 to move away from the fixed plug 22. In this process, the floating plug 20 will squeeze the return spring 19, so that the return spring 19 is in a compressed state and begins to accumulate elastic potential energy. When the sealing portion 21 is disengaged from the engagement state with the sealing groove 23, the inner cavity of the detection seat 3 will be connected with the inner cavity of the insulating air chamber 1, thereby enabling the gas compression system to deliver compressed gas into the insulating air chamber 1;

[0058] When the air pressure in the inner cavity of the detection seat 3 is consistent with the air pressure in the inner cavity of the insulating air chamber 1, the gas thrust on the sealing part 21 disappears. At this time, the elastic potential energy accumulated by the reset spring 19 is released, so that the floating plug 20 drives the sealing part 21 to move toward the direction close to the fixed plug 22, so that the sealing part 21 can be re-stuck in the sealing groove 23, so that the rotating column 26 rotates in the opposite direction. When the rotating column 26 rotates in the opposite direction, the gear part 27 and the rack part 30 will engage in reverse transmission, thereby causing the driving column 28 to move in the direction away from the pressure sensor 8, thereby causing the pressure signal of the pressure sensor 8 to disappear. At this time, it can be determined that the air pressure in the inner cavity of the detection seat 3 and the inner cavity of the insulating air chamber 1 are consistent. The consistent air pressure indicates that there is no leakage point inside the insulating air chamber 1. Therefore, the air pressure in the insulating air chamber 1 can be maintained for a certain period of time, indicating that the air tightness of the insulating air chamber 1 is good.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A sealing performance testing device for an inflatable cabinet, comprising a detection seat (3) installed in a cable threading hole provided in the outer shell of an insulating air chamber (1) of an inflatable cabinet (2), characterized in that: Also includes: A sealing clamping assembly installed at one end of the detection seat (3), the sealing clamping assembly being used to install the detection seat (3) in the cable threading hole and to enable the inner cavity of the insulating air chamber (1) to be in communication with the inner cavity of the detection seat (3); A protrusion (7) and a pipe interface (31) fixedly connected to the outer wall of the detection seat (3), wherein the pipe interface (31) is connected to an external compressed gas system, and the protrusion (7) is hollow inside and has an open end away from the detection seat (3); A driving column (28) is coaxially slidably provided in the inner cavity of the protruding portion (7), and when the air pressure in the inner cavity of the insulating air chamber (1) is lower than the air pressure in the inner cavity of the detection seat (3), the driving column (28) moves linearly toward the outer side of the detection seat (3); A displacement detection component provided on the protruding portion (7), the displacement detection component being used for the linear motion stroke of the driving column (28); The inner cavity of the detection seat (3) is provided with a floating component, and the floating component is used to drive the driving column (28) to move toward the outer side of the detection seat (3) when the air pressure in the inner cavity of the detection seat (3) is greater than the air pressure in the inner cavity of the insulating air chamber (1). The floating component includes a fixed plug (22) coaxially fixed to the inner cavity of the detection seat (3), and a rotating column (26) is coaxially passed through the end face of the fixed plug (22). The rotating column (26) rotates freely on the fixed plug (22), and a gear portion (27) is provided on the periphery of one end of the rotating column (26). A rack portion (30) meshing with the gear portion (27) is provided on the periphery of the driving column (28), and the fixed plug (22) is provided with a rotating unit for driving the rotating column (26) to rotate; The rotating unit comprises a fixed sleeve (24) fixedly embedded in the fixed plug (22), the fixed sleeve (24) is provided with a sliding hole for the rotating column (26) to freely pass through, two balls are rotatably embedded in the hole wall of the sliding hole, and the rotating column (26) is provided with a spiral rolling groove (25) on the periphery of which the balls are engaged and can freely roll; The end of the rotating column (26) away from the gear part (27) is coaxially connected to the floating plug (20), and the end face of the floating plug (20) is fixed with multiple sealing parts (21). The end face of the fixed plug (22) is provided with a sealing groove (23) for the corresponding insertion of the sealing part (21). A reset spring (19) is installed in the inner cavity of the detection seat (3), and the two ends of the reset spring (19) in the elastic direction elastically press against the end face of the floating plug (20) and the inner cavity wall of the detection seat (3).

2. The sealing performance testing device for an inflatable cabinet according to claim 1, characterized in that: The displacement detection assembly includes a pressure sensor (8) fixedly mounted on the mouth of the protrusion (7); a hollow rubber column (29) is bonded to one end of the driving column (28) facing the radial outer side of the detection seat (3); and an end of the hollow rubber column (29) away from the driving column (28) is abutted and connected to the surface of the pressure sensor (8).

3. The sealing performance testing device for an inflatable cabinet according to claim 1, characterized in that: The sealing clamping assembly includes a cylindrical portion (16) coaxially connected to one end of the detection seat (3) away from the pipe interface (31), the periphery of the cylindrical portion (16) is slidably fitted with a clamping portion (10), the end face of the clamping portion (10) is coaxially fixed with a clamping portion (18), the axial thickness of the clamping portion (18) matches the thickness of the outer shell of the insulating air chamber (1), the clamping portion (18) is provided with a sealing unit, the clamping portion (10) is fixed with a mounting plate (6) through a plurality of columns (9), the mounting plate (6) is mounted with a cylinder (5), and the cylinder rod of the cylinder (5) is connected to the detection seat (3).

4. The sealing performance testing device for an inflatable cabinet according to claim 3, characterized in that: The sealing unit comprises an extrusion portion (13) coaxially fixed to one end of the cylindrical portion (16) away from the detection seat (3), and a rubber airbag (12) is provided between the extrusion portion (13) and the opposite end of the clamping portion (18).

5. The sealing performance testing device for an inflatable cabinet according to claim 4, characterized in that: The clamping portion (18) is coaxially fixed with a tapered portion (17) at one end thereof facing the extrusion portion (13), and the outer diameter of the tapered portion (17) decreases in sequence in a direction away from the clamping portion (18). The end face of the extrusion portion (13) is fixed with an expansion portion (15), and the expansion portion (15) is provided with a tapered groove (4) for use with the tapered portion (17). The extrusion portion (13) and the columnar portion (16) are provided with a deformation seam (32).

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