Airtightness detection device for FTU box body

Abstract

The utility model relates to the technical field of detection equipment, in particular to air tightness detection equipment of an FTU box body. Comprising a base, four guide supports arranged on the base, a fixing seat arranged on the guide supports, a sealing cover arranged on the base, a telescopic air cylinder arranged on the fixing seat, a vacuum opening formed in the base, an air pressure detection hole formed in the base and a sealing clamping groove formed in the upper end face of the base. The sealing piece is arranged on the upper end face of the base and comprises a sealing block fixedly arranged on the base, a deformation opening formed in the middle of the upper end of the sealing block, two sealing end bodies formed on the sealing block and two concave open grooves formed in the left end face and the right end face of the sealing block. And the other block body also can provide a sealing effect, so that a tiny leakage gap is not easy to form on a sealing interface, and the measurement result of the air tightness is not easy to influence.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to an airtightness testing device for an FTU housing. Background Technology

[0002] In modern power distribution network automation systems, feeder terminal units (FTUs) are core intelligent devices widely installed at critical nodes such as sectionalizing switches and tie switches on outdoor power distribution lines. The FTU enclosure is responsible for real-time acquisition of electrical quantities such as voltage and current of the line, and performs advanced functions such as fault detection, location, isolation, and power restoration to non-faulty areas. It is a crucial cornerstone for ensuring the reliable and efficient operation of the power distribution network.

[0003] FTU enclosures are typically exposed to complex and variable outdoor environments for extended periods, inevitably facing severe challenges from wind, rain, dust, salt spray, humidity, and even extreme temperatures. Therefore, their enclosures must possess an extremely high protection rating (usually IP67 or higher, meaning complete dustproof and capable of short-term water immersion). This high level of protection relies entirely on the superior airtightness of the FTU enclosure and its interfaces (such as cable inlets, control panels, and vent valves). Any defects in the enclosure's airtightness will allow moisture and humidity to infiltrate, posing the most direct risk. Moisture entering the sealed enclosure will condense on the circuit boards and electronic components, causing short circuits, component corrosion, and decreased insulation performance, directly leading to equipment malfunction or permanent damage.

[0004] Currently, airtightness testing often uses the vacuum testing method. This method first places the FTU box on the base, and then pushes the sealing cover down by a cylinder to form a sealed chamber between the sealing cover and the base. The vacuum pump establishes a negative pressure environment in the sealed chamber. If there is a leak in the workpiece, the gas inside will escape into the chamber, causing the pressure to rise. The airtightness is determined by monitoring this pressure change.

[0005] The structural design and reliability of the sealing ring directly determine the accuracy and stability of the test results. Currently, the sealing ring structures widely used in existing technologies are mostly single rectangular rings or O-rings. These traditional sealing rings rely on a single sealing lip at the top contacting the sealing cover plane, deforming under sufficient clamping force to achieve a seal.

[0006] However, this sealing ring structure uses a single planar contact to achieve sealing. When particulate impurities such as dust, metal shavings, and fibers adhere to the plane of the sealing ring, and the sealing cover presses down on the sealing ring, the position of the sealing ring with impurities is difficult to fit with the lower end face of the sealing cover, which can easily lead to the formation of a tiny leakage gap at the sealing interface, thus easily affecting the measurement results of airtightness. Utility Model Content

[0007] The purpose of this invention is to provide an airtightness testing device for FTU housings, addressing the deficiencies and shortcomings of existing technologies.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an airtightness testing device for an FTU housing, comprising a base, four guide supports equidistantly arranged on the upper surface of the base, a fixing plate disposed on the upper end of the four guide supports, a sealing cover disposed above the base, a telescopic cylinder for driving the sealing cover to rise and fall with its fixed end disposed on the fixing plate and its output end connected to the sealing cover, a vacuum opening on the base for connecting to an external vacuum device, a pressure detection hole on the base for connecting to an external vacuum sensor, a sealing groove on the upper surface of the base, and a sealing element disposed on the upper surface of the base within the sealing groove. The sealing element includes a sealing block fixedly disposed on the upper surface of the base within the sealing groove, a deformation opening in the middle of the upper end of the sealing block, two sealing end bodies formed on the sealing block, and two recessed grooves respectively disposed on the left and right end faces of the sealing block and symmetrically arranged.

[0009] A further improvement is that the upper ends of the two sealing end bodies are respectively provided with arc-shaped top surfaces, and the two sealing end bodies are respectively provided with arc-shaped transition surfaces for connecting the arc-shaped top surfaces with the deformation openings.

[0010] Further benefits: Compared to the horizontal shape at the top of the two sealing end bodies, the arc-shaped top surface and arc-shaped transition surface can, through the deformation of the two sealing end bodies, allow the lower end of the sealing cover to contact the upper end of the two sealing end bodies as much as possible when the upper end of the two sealing end bodies comes into contact with the lower end of the sealing cover, thereby forming a stable sealing end.

[0011] A further improvement is that an auxiliary sealing body is provided on the sealing block within the deformation opening, which is used to form a sealing end by contacting the lower end of the sealing cover after the two sealing end bodies are pressed down by the sealing cover and deformed in the shape.

[0012] Further effect: After the sealing cover is pressed down until the two sealing end bodies deform outward, the auxiliary sealing body can contact the lower end of the sealing cover to form a sealing end, thereby forming three sealing ends on the sealing block, improving the sealing effect of the sealing block on the sealing cover.

[0013] A further improvement is that the upper end of the auxiliary sealing body is an arc surface, and the lower end is integrally formed with the sealing block.

[0014] A further improvement is that: two fixing plates are symmetrically arranged on the upper end face of the base, a bearing support plate is arranged between the two fixing plates, a slide rail is arranged between the bearing support plate and the two fixing plates, and a limit plate is arranged on the bearing support plate.

[0015] A further improvement is that two side limiting plates are provided on both sides of the upper end of the bearing tray, and the two side limiting plates are symmetrically arranged on both sides of the upper end of the bearing tray.

[0016] A further improvement is that support plates are installed on both side limit plates.

[0017] A further improvement is that the slide rail component includes a fixing plate fixedly disposed on the inner side of the fixing plate. The fixing plate is disposed along the length direction of the fixing plate and has the same length as the fixing plate. The number of fixing plates is the same as the number of fixing plates. Guide balls are fixedly disposed at both the upper and lower ends of the fixing plate. A connecting plate is disposed on one side of the fixing plate. The side end face of the connecting plate is fixedly connected to the side edge of the bearing plate. The connecting plate is in clearance fit with the guide ball through an arc groove.

[0018] A further improvement is that a supporting reinforcing rib is fixedly provided between the output end of the telescopic cylinder and the upper end face of the sealing cover.

[0019] Further benefits: The addition of supporting ribs can improve the lifting and lowering control of the sealing cover by the output end of the telescopic cylinder. Compared with setting them separately in the upper middle part of the sealing cover, it can effectively improve the driving stability of the sealing cover.

[0020] A further improvement is that a guide auxiliary plate is provided on the periphery of the sealing cover, and four guide openings are equidistantly provided on the guide auxiliary plate for clearance matching with the guide bracket.

[0021] Further benefits: Through the cooperation of the guide auxiliary plate and guide opening with the guide bracket, the lifting and lowering of the sealing cover can be guided and assisted when the telescopic cylinder extends and retracts, and the phenomenon of sealing cover deviation can be reduced.

[0022] After adopting the above technical solution, the beneficial effects of this utility model are as follows: When the sealing cover is lowered and placed on the base by the telescopic cylinder, the lower end face of the sealing cover is pressed against the sealing block of the sealing groove. The setting of the deformation opening divides the sealing block into two symmetrical blocks. When the sealing block is pressed down by the sealing cover, the two blocks deform outward through the two recessed slots. The two blocks are pressed against the lower end face of the sealing cover to form two sealing ends. Compared with the traditional sealing ring structure, two sealing end structures can be formed on one sealing block. Even if impurities adhere to one of the sealing end bodies of the sealing block, the other block can still provide a sealing effect. It is easier to make the sealing block fit with the lower end face of the sealing cover, and it is not easy to cause the formation of a tiny leakage gap at the sealing interface, thus it is not easy to affect the measurement results of airtightness. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a side view of the present invention;

[0026] Figure 3 This is a schematic diagram of the base structure in this utility model;

[0027] Figure 4 This is a front sectional view of the base in this utility model;

[0028] Figure 5 This is another state diagram of the sealing block in this utility model;

[0029] Figure 6 It corresponds Figure 4 Enlarged view of part A;

[0030] Figure 7 This is a schematic diagram of the structure of the support plate in this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1. Base; 2. Guide bracket; 3. Fixed seat; 4. Sealing cover; 5. Telescopic cylinder; 6. Vacuum opening; 7. Air pressure detection hole; 8. Sealing groove; 9. Deformation opening; 10. Sealing end body; 11. Recessed groove; 12. Arc top surface; 13. Arc transition surface; 14. Auxiliary sealing body; 15. Fixed plate; 16. Bearing support plate; 17. Limiting plate; 18. Fixed mounting plate; 19. Guide ball; 20. Connecting plate; 21. Support reinforcing rib; 22. Guide auxiliary plate; 23. Guide opening; 24. Support cross plate; 25. Side limiting plate; 26. Detailed Implementation

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] See Figures 1 to 7As shown, the technical solution adopted in this specific embodiment is: an airtightness testing device for an FTU housing, including a base 1, four guide supports 2 equidistantly arranged on the upper surface of the base 1, a fixed seat 3 disposed on the upper end of the four guide supports 2, a sealing cover 4 disposed above the base 1, a telescopic cylinder 5 for driving the sealing cover 4 to rise and fall, the cylinder being fixed on the fixed seat 3 and connected to the sealing cover 4 at its output end, a vacuum opening 6 on the base 1 for connecting to an external vacuum device, a pressure detection hole 7 on the base 1 for connecting to an external vacuum sensor, a sealing groove 8 on the upper surface of the base 1, and a sealing element disposed on the upper surface of the base 1 within the sealing groove 8. The sealing element includes a sealing block 9 fixedly disposed on the upper surface of the base 1 within the sealing groove 8, a deformation opening 10 at the upper middle of the sealing block 9, two sealing end bodies 11 formed on the sealing block 9, and two recessed grooves 12 respectively disposed on the left and right end faces of the sealing block 9 and symmetrically arranged. Figure 1 As shown, four guide brackets 2 are cylindrical guide rods, which are equidistantly fixed to the upper surface of the base 1. The guide brackets 2 are used to connect and fix the base 1 and the fixed seat 3. The space formed when the sealing cover 4 is placed on the base 1 is a space for placing the FTU box. A through hole is opened in the middle of the fixed seat 3 for the output end of the telescopic cylinder 5 to pass through. The fixed end of the telescopic cylinder 5 is installed on the upper surface of the fixed seat 3 by bolts. The output end of the telescopic cylinder 5 is welded to the upper middle part of the sealing cover 4 or connected by flange threads. The telescopic cylinder 5 is connected to the external vacuum device and vacuum sensor and the controller of the equipment. The external vacuum device is a device that can extract air from the cavity and has the function of extracting and injecting air. A connector for connecting the air pipe of the telescopic cylinder 5 is provided at the upper end of the fixed seat 3. A connector for connecting the air pipe is provided at the lower end of the base 1 at the position of the vacuum opening 6 and the air pressure detection hole 7. Figure 3 As shown, the sealing block 9 is arranged along the shape of the sealing groove 8, and the sealing block 9 is installed on the base 1 by means of adhesive or hot melt.

[0034] For safety, baffles are installed around the sealing cover 4 between the base 1 and the fixed seat 3, and a sensor is installed on the front. A roller and a curtain wound on the roller are installed on the fixed seat 3, as well as a corresponding reset device (such as a coil spring). The machine will only start when the curtain is pulled to the sensor position. This way, no limbs or other objects will be inserted and cause danger during the descent of the sealing cover 4. Alternatively, a control button can be directly installed on the base 1. After the items are placed, pressing the control button will drive the sealing cover 4 to descend.

[0035] The upper ends of the two sealing end bodies 11 are respectively provided with arc-shaped top surfaces 13, and the two sealing end bodies 11 are respectively provided with arc-shaped transition surfaces 14 for connecting the arc-shaped top surfaces 13 and the deformation openings 10.

[0036] An auxiliary sealing body 15 is provided on the sealing block 9 inside the deformation opening 10, which is used to form a sealing end by contacting the lower end of the sealing cover 4 after the sealing cover 4 is pressed down to deform the two sealing end bodies 11 in the outward direction.

[0037] The upper end of the auxiliary sealing body 15 is an arc surface, and the lower end is integrally formed with the sealing block 9. The specific shape of the sealing block 9 is as follows: Figure 4 As shown.

[0038] Two fixed plates 16 are symmetrically arranged on the upper surface of the base 1, and a support plate 17 is arranged between the two fixed plates 16. A slide rail is arranged between the support plate 17 and the two fixed plates 16, and a limit plate 18 is provided on the support plate 17. The fixed plates 16 are welded to the base 1 or fixedly connected with bolts. The support plate 17 can be pulled out and pushed in through the slide rail. The height of the limit plate 18 is such that after the FTU box is placed on the support plate 17, it restricts the tail of the FTU box to achieve a positioning function.

[0039] Two side limiting plates 26 are provided on both sides of the upper end of the support tray 17, symmetrically arranged on both sides of the upper end of the support tray 17. The two side limiting plates 26 are located on the left and right sides of the base 1, while a limiting plate 18 is located on the rear side of the support tray 17. The support tray 17, side limiting plates 26, and limiting plates 18 can be integrally formed or separately welded together. The distance between the two side limiting plates 26 is pre-set according to the width of the FTU box. After the FTU box is placed on the support tray 17, the two side limiting plates 26 limit the left and right sides of the FTU box, further enhancing the placement and positioning effect of the FTU box in conjunction with the limiting plate 18. The support tray 17 is a rectangular three-dimensional tray with a cavity for accommodating the FTU box. The two side limiting plates 26 are arranged as follows: Figure 3 It is fixed to the side end face of the tray as shown.

[0040] Supporting horizontal plates 25 are provided on the two side limiting plates 26. The supporting horizontal plates 25 are fixed to the two side limiting plates 26. Since some FTU boxes have an inclined mounting plate at the bottom, the FTU box may tilt upwards if placed directly on a flat surface. In this case, the supporting horizontal plates 25 support the lower surface of the FTU box. Figure 2 As shown. When performing airtightness testing on FTU boxes with a partially flat bottom, the support plate 25 can be omitted. Alternatively, to support the FTU box and prevent the bottom plane from touching the plane of the support plate 17, two support plates 25 can be installed to support the FTU box, leaving a gap between its bottom surface and the plane of the support plate 17, which facilitates testing whether the bottom surface is flat.

[0041] The slide rail component includes a fixing plate 19 fixedly mounted on the inner side of the fixing plate 16. The fixing plate 19 is arranged along the length of the fixing plate 16 and is the same length as the fixing plate 16. The number of fixing plates 19 is the same as the number of fixing plates 16. Guide balls 20 are fixedly mounted at both the upper and lower ends of the fixing plate 19. A connecting plate 21 is provided on one side of the fixing plate 19. The side end face of the connecting plate 21 is fixedly connected to the side edge of the support plate 17. The connecting plate 21 is clearance-fitted with the guide balls 20 through an arc groove. As shown in the figure, the upper and lower sides of the connecting plate 21 are engaged in the two guide balls 20 through the arc groove surface, and the end of the connecting plate 21 is wrapped around the guide balls 20 to prevent the connecting plate 21 from moving out from the side. Through the fixed connection of the fixing plate 19 and the guide balls 20, and the clearance fit between the arc groove surface and the guide balls 20, the sliding effect of the support plate 17 is achieved. The slide rail component can also be a traditional drawer-type slide rail structure.

[0042] A supporting reinforcing rib 22 is fixedly provided between the output end of the telescopic cylinder 5 and the upper end face of the sealing cover 4.

[0043] Four supporting reinforcing ribs 22 are provided. The four supporting reinforcing ribs 22 are equidistantly arranged between the output end of the telescopic cylinder 5 and the upper end face of the sealing cover 4. The intersection ends of the four supporting reinforcing ribs 22 are fixed to the output end of the telescopic cylinder 5 by welding or bolting through a fixing sleeve, while the lower end face of the four supporting reinforcing ribs 22 is welded and fixed to the upper end face of the sealing cover 4.

[0044] The sealing cover 4 is provided with a guide auxiliary plate 23 on its periphery. The guide auxiliary plate 23 is provided with four guide openings 24 at equal intervals for clearance matching with the guide bracket 2.

[0045] The guide auxiliary plate 23 is a frame plate fixedly welded to the periphery of the sealing cover 4. During assembly, the four guide openings 24 of the guide auxiliary plate 23 fixed to the periphery of the sealing cover 4 are first aligned with the four guide brackets 2 and then installed. The fixing seat 3 is then fixedly installed on the four guide brackets 2, and the telescopic cylinder 5 is installed.

[0046] The working principle of this utility model is as follows: When the telescopic cylinder 5 drives the sealing cover 4 to descend and be placed on the base 1, the lower end face of the sealing cover 4 is pressed against the sealing block 9 of the sealing groove 8. The deformation opening 10 divides the sealing block 9 into two symmetrical blocks. When the sealing block 9 is pressed down by the sealing cover 4, the two blocks deform outward through the two recessed slots 12. The two blocks are pressed against the lower end face of the sealing cover 4 to form two sealing ends. Compared with the traditional sealing ring structure, two sealing end structures can be formed on one sealing block 9. Even if impurities adhere to one of the sealing end bodies 11 of the sealing block 9, the other block can still provide a sealing effect. It is easier to make the sealing block 9 fit with the lower end face of the sealing cover 4, and it is not easy to form a tiny leakage gap at the sealing interface, so it is not easy to affect the measurement results of air tightness.

[0047] When the upper end faces of the two sealing end bodies 11 and the lower end of the sealing cover 4 are in contact, the deformation of the two sealing end bodies 11 can make the end faces contact the lower end of the sealing cover 4 with the upper end of the two sealing end bodies 11 as much as possible, thereby forming a stable sealing end.

[0048] After the sealing cover 4 is pressed down until the two sealing end bodies 11 deform outward, the auxiliary sealing body 15 can contact the lower end of the sealing cover 4 to form a sealing end, thereby forming three sealing ends for the sealing block 9, improving the sealing effect of the sealing block 9 on the sealing cover 4.

[0049] This utility model aims to protect the structure of the product. The model numbers of the components are not the focus of this utility model's protection, as they are known technologies. Any component on the market that can achieve the functions described above can be used as an airtightness testing device for an FTU housing. Therefore, the model numbers and other parameters of the components are not described in detail in this utility model. The contribution of this utility model lies in the scientific combination of the various components.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions provided are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents. Any aspects of this utility model not detailed herein are well-known to those skilled in the art.

Claims

1. An airtightness testing device for an FTU housing, comprising a base, four guide supports equidistantly arranged on the upper surface of the base, a fixed base disposed on the upper ends of the four guide supports, a sealing cover disposed above the base, a telescopic cylinder for driving the sealing cover to rise and fall, a vacuum opening on the base for connecting to an external vacuum device, a pressure detection hole on the base for connecting to an external vacuum sensor, a sealing groove on the upper surface of the base, and a sealing element disposed on the upper surface of the base within the sealing groove, characterized in that: The sealing element includes a sealing block fixedly disposed on the upper end face of the base within a sealing groove, a deformation opening formed in the middle of the upper end of the sealing block, two sealing end bodies formed on the sealing block, and two recessed slots respectively formed on the left and right end faces of the sealing block and symmetrically arranged.

2. The airtightness testing device for an FTU housing according to claim 1, characterized in that: The upper ends of the two sealing end bodies are respectively provided with arc-shaped top surfaces, and the two sealing end bodies are respectively provided with arc-shaped transition surfaces for connecting the arc-shaped top surfaces with the deformation openings.

3. The airtightness testing device for an FTU housing according to claim 1, characterized in that: An auxiliary sealing body is provided on the sealing block within the deformation opening, which is used to form a sealing end by contacting the lower end of the sealing cover after the two sealing end bodies are pressed down and deformed in the shape of the sealing cover.

4. The airtightness testing device for an FTU housing according to claim 3, characterized in that: The upper end of the auxiliary sealing body is an arc surface, and the lower end is integrally formed with the sealing block.

5. The airtightness testing device for an FTU housing according to claim 1, characterized in that: The upper end face of the base is symmetrically provided with two fixing plates, a bearing support plate is provided between the two fixing plates, a slide rail is provided between the bearing support plate and the two fixing plates, and a limit plate is provided on the bearing support plate.

6. The airtightness testing device for an FTU housing according to claim 5, characterized in that: The upper end of the support plate is provided with two side limiting plates, which are symmetrically arranged on both sides of the upper end of the support plate.

7. The airtightness testing device for an FTU housing according to claim 6, characterized in that: Support plates are provided on both side limit plates.

8. The airtightness testing device for an FTU housing according to claim 5, characterized in that: The slide rail component includes a fixing plate fixedly disposed on the inner side of the fixing plate. The fixing plate is disposed along the length direction of the fixing plate and has the same length as the fixing plate. The number of fixing plates is the same as the number of fixing plates. Guide balls are fixedly disposed at both the upper and lower ends of the fixing plate. A connecting plate is disposed on one side of the fixing plate. The side end face of the connecting plate is fixedly connected to the side edge of the bearing plate. The connecting plate is in clearance fit with the guide ball through an arc groove.

9. The airtightness testing device for an FTU housing according to claim 1, characterized in that: A supporting reinforcing rib is fixedly provided between the output end of the telescopic cylinder and the upper end face of the sealing cover.

10. The airtightness testing device for an FTU housing according to claim 1, characterized in that: The sealing cover is provided with a guide auxiliary plate on its periphery, and four guide openings are equidistantly provided on the guide auxiliary plate for clearance matching with the guide bracket.

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