Air tightness detection device for transformer shell

Abstract

The utility model provides an air tightness detection device for a transformer shell, which comprises a box body and a top plate, the top plate is positioned above the box body and is connected with the top of the box body through a plurality of uniformly distributed support rods, a telescopic cylinder is assembled at the top of the top plate, a telescopic shaft of the telescopic cylinder penetrates through the top plate along the vertical direction, and a detection cover is fixedly mounted at the end part of the telescopic shaft. A helium detector and a pressing plate are arranged in the detection cover, and the pressing plate is arranged at a preset height in the detection cover and is horizontal; a control pump and a helium tank are assembled in the box body, a gas inlet pipe of the control pump is communicated with the helium tank, and a gas outlet pipe is communicated with a through groove formed in the top of the box body. According to the utility model, when the telescopic cylinder drives the detection cover to tightly abut against the top of the box body, the transformer shell is covered, and meanwhile, the pressing plate also enables the transformer shell to tightly abut against the top of the box body, at the moment, helium in the helium tank is fed into the transformer shell through the control pump, and the helium detector can be matched for detection.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of transformer production and manufacturing, and in particular to an air tightness detection device for a transformer shell. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. It is basic equipment for power transmission and distribution and is widely used in industry, agriculture, transportation, urban communities and other fields. The main components of a transformer are coils, iron cores and casings. The inside of a transformer is usually filled with high-voltage oil and insulating materials. If the casing is not airtight, it may cause oil leakage or damage to the insulating material, which may lead to safety accidents such as fire and explosion. Therefore, by testing the airtightness of the transformer casing, potential safety hazards can be discovered and repaired in a timely manner to prevent the occurrence of safety accidents.

[0003] Application number: CN201921984011.2, discloses an airtightness testing device, including a support frame and a vertical rod, a motor is installed on the upper part of the support frame, and a rotating rod is connected to the right side of the motor, and a rotating drum is provided on the outside of the rotating rod, a working bearing is installed on the upper end of the rotating drum, and the working bearing is installed on the upper end of the support frame, the vertical rod is installed inside the rotating drum, the lower end of the sealing cover is connected to the transformer housing, an operating rod is installed in the middle of the lower support seat, a fixed cylinder is connected to the outside of the upper end of the connecting rod, and a positioning groove is provided at the upper end of the movable plate. The utility model has the following advantages and effects: a structure with a positioning and transfer function is designed, which solves the problem that traditional devices are inconvenient to transfer the transformer housing and are inconvenient to detect transformer housings of different specifications, and a structure with an extrusion sealing function is designed, which solves the problem of low detection efficiency of traditional devices.

[0004] In the above-mentioned prior art, it is necessary to first rotate the operating lever to drive the positioning plate to squeeze the lower end of the transformer casing, then push the lower support seat to push the transformer casing to the bottom of the sealing cover, and then start the motor to drive the sealing cover to squeeze the upper end of the transformer casing. Finally, the front of the transformer casing can be blown by a high smoke gun, and the air tightness of the transformer casing can be tested with the pressure gauge. The overall operation steps are relatively large, and it takes a long time, which affects the overall work efficiency. Utility Model Content

[0005] 1. Technical problems to be solved by the utility model:

[0006] The utility model provides an airtightness detection device for a transformer casing, which is used to solve the technical problems existing in the above-mentioned background technology.

[0007] 2. Technical solution:

[0008] To achieve the above-mentioned object, the technical solution provided by the present invention is as follows: a device for detecting the air tightness of a transformer casing, comprising a box body and a top plate, wherein the top plate is located above the box body and is connected to the top of the box body via a plurality of evenly distributed support rods, a telescopic cylinder is mounted on the top of the top plate, a telescopic axis of the telescopic cylinder vertically passes through the top plate, and a detection cover is fixedly mounted on the end thereof, a helium detector and a pressure plate are disposed within the detection cover, and the pressure plate is placed at a predetermined height within the detection cover and is horizontal;

[0009] A control pump and a helium tank are assembled inside the box body. The air inlet pipe of the control pump is connected to the helium tank, and the air outlet pipe is connected to the through groove opened on the top of the box body.

[0010] Furthermore, a limiting block is provided on the top of the box body, and the number of the limiting blocks is at least four, and they surround to form a rectangular shape.

[0011] Furthermore, the limit block includes an integrally formed vertical portion and a horizontal portion, the horizontal portion is slidably connected to a slide groove opened at the top of the box body, the slide groove extends along the X-axis or Y-axis direction, a threaded groove is opened through the top of the horizontal portion, and a positioning bolt is threadedly connected in the threaded groove.

[0012] Furthermore, a connecting sleeve is provided at the center of the top of the pressure plate, and guide sliding rods are provided at both sides of the top. The connecting sleeve and the guide sliding rods extend in the vertical direction. The connecting sleeve is internally threaded with a screw rod, the screw rod is rotatably connected to the detection cover, and a handle is fixedly installed at the end. The guide sliding rod is slidably connected to the detection cover.

[0013] Furthermore, a plurality of evenly distributed self-locking universal wheels are installed at the bottom edge of the box.

[0014] 3.Beneficial effects:

[0015] The technical solution provided by the present invention has the following beneficial effects compared with the existing technology: when the telescopic cylinder drives the detection cover to tightly abut against the top of the box, the transformer casing will be covered, and at the same time, the pressure plate will also make the transformer casing tightly abut against the top of the box. At this time, the helium in the helium tank is sent into the transformer casing by controlling the pump, and the helium detector can be used for detection. The whole process is simple and fast, takes less time, and improves the overall work efficiency. Compared with the traditional air pressure detection method, helium has a small molecular weight, light weight, strong diffusivity, and high permeability, and can easily pass through the leak hole, so that tiny leak points can be quickly discovered and located. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the shaft side structure of the utility model;

[0017] Figure 2This is a schematic diagram of the top structure of the box body of the present utility model;

[0018] Figure 3 For the utility model Figure 2 A in the middle is an enlarged structural diagram;

[0019] Figure 4 This is a schematic diagram of the cross-section structure of the detection cover of the present utility model.

[0020] Reference numerals:

[0021] 1. Box body; 101. Through slot; 102. Slide slot; 2. Top plate; 3. Support rod; 4. Telescopic cylinder; 5. Detection cover; 6. Helium detector; 7. Pressure plate; 8. Control pump; 9. Helium tank; 10. Limit block; 1001. Threaded groove; 11. Positioning bolt; 12. Connecting sleeve; 13. Guide rod; 14. Screw; 15. Handle; 16. Self-locking universal wheel. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connected," "fixed," "provided with," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances. Example

[0026] Refer to the attached Figure 1-4 A device for detecting air tightness of a transformer casing comprises a box body 1 and a top plate 2. The top plate 2 is located above the box body 1 and is connected to the top of the box body 1 by a number of evenly distributed support rods 3. A telescopic cylinder 4 is mounted on the top of the top plate 2. The telescopic axis of the telescopic cylinder 4 passes through the top plate 2 in the vertical direction, and a detection cover 5 is fixedly installed at the end thereof. A helium detector 6 and a pressure plate 7 are arranged in the detection cover 5. The pressure plate 7 is placed at a predetermined height in the detection cover 5 and is horizontal.

[0027] A control pump 8 and a helium tank 9 are assembled inside the box body 1 . The air inlet pipe of the control pump 8 is connected to the helium tank 9 , and the air outlet pipe is connected to a through slot 101 opened on the top of the box body 1 .

[0028] In this embodiment, the open end of the transformer casing to be inspected is placed on the top of the box body 1, and the through groove 101 is placed inside it. Then, the telescopic cylinder 4 is started to drive the detection cover 5 to move downward until the detection cover 5 is tightly against the top of the box body 1 and covers the transformer casing. At the same time, the pressure plate 7 will also be against the top of the transformer casing, so that the transformer casing is also tightly against the top of the box body 1. At this time, the control pump 8 is started to extract helium in the helium tank 9 and send it into the transformer casing through the through groove 101. When the helium detector 6 detects helium, it means that the helium in the transformer casing has escaped, and the air tightness of the transformer casing is unqualified. Otherwise, it is qualified. The whole detection process is simple and fast, takes less time, and improves the overall work efficiency. Compared with the traditional air pressure detection method, helium has a small molecular weight, light weight, strong diffusivity, and high permeability, and is easy to pass through the leak hole, so that small leak points can be quickly discovered and located.

[0029] A limiting block 10 is provided on the top of the box body 1. The number of the limiting blocks 10 is at least four and they are arranged around to form a rectangular shape. The transformer housing is placed between the four limiting blocks 10 and can be used to limit its horizontal position.

[0030] The limit block 10 includes an integrally formed vertical portion and a horizontal portion. The horizontal portion is slidably connected to a slide groove 102 opened on the top of the box body 1. The slide groove 102 extends along the X-axis or Y-axis direction. A threaded groove 1001 is opened through the top of the horizontal portion. A positioning bolt 11 is connected to the inner thread of the threaded groove 1001. The horizontal portion can be locked by the positioning bolt 11 after sliding in the threaded groove 1001, thereby being able to limit the transformer casing of different specifications.

[0031] A connecting sleeve 12 is provided at the center of the top of the pressure plate 7, and guide slide rods 13 are provided at both sides of the top. The connecting sleeve 12 and the guide slide rod 13 both extend in the vertical direction. The connecting sleeve 12 is internally threaded with a screw rod 14, and the screw rod 14 is rotatably connected to the detection cover 5, and a handle 15 is fixedly installed at the end. The guide slide rod 13 is slidably connected to the detection cover 5.

[0032] In this embodiment, after holding the handle 15 to drive the screw rod 14 to rotate, the guide rod 13 can be driven to slide on the detection cover 5 through the threaded connection between the screw rod 14 and the connecting sleeve 12, so that the height of the pressure plate 7 can be adjusted, and it can be used to press the transformer casing of different heights.

[0033] The bottom edge of the box body 1 is equipped with a number of evenly distributed self-locking universal wheels 16 for facilitating the movement of the entire box body.

[0034] The above-mentioned embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, which all fall within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

[0035] It should be noted that the above content belongs to the technical knowledge scope of the inventor. Since the technical content in this field is vast and too complicated, the above content of this application does not necessarily constitute prior art.

Claims

1. A device for detecting the air tightness of a transformer housing, characterized in that: The invention comprises a box body (1) and a top plate (2), wherein the top plate (2) is located above the box body (1) and is connected to the top of the box body (1) via a plurality of evenly distributed support rods (3), a telescopic cylinder (4) is mounted on the top of the top plate (2), a telescopic axis of the telescopic cylinder (4) passes through the top plate (2) in a vertical direction, and a detection cover (5) is fixedly mounted on the end thereof, a helium detector (6) and a pressure plate (7) are arranged in the detection cover (5), and the pressure plate (7) is placed at a predetermined height in the detection cover (5) and is horizontal; The box (1) is equipped with a control pump (8) and a helium tank (9). The air inlet pipe of the control pump (8) is connected to the helium tank (9), and the air outlet pipe is connected to the through groove (101) opened on the top of the box (1).

2. The air tightness detection device for a transformer housing according to claim 1, characterized in that: A limiting block (10) is provided on the top of the box body (1), and the number of the limiting blocks (10) is at least four and they surround to form a rectangular shape.

3. The air tightness detection device for a transformer housing according to claim 2, characterized in that: The limit block (10) comprises an integrally formed vertical portion and a horizontal portion, the horizontal portion being slidably connected to a slide groove (102) provided on the top of the box body (1), the slide groove (102) extending along the X-axis or Y-axis direction, a thread groove (1001) extending through the top of the horizontal portion, and a positioning bolt (11) being connected to the inner thread of the thread groove (1001).

4. The air tightness detection device for a transformer housing according to claim 1, characterized in that: A connecting sleeve (12) is provided at the center of the top of the pressure plate (7), and guide slide rods (13) are provided at both sides of the top. The connecting sleeve (12) and the guide slide rod (13) extend in the vertical direction. The connecting sleeve (12) is internally threaded with a screw rod (14). The screw rod (14) is rotatably connected to the detection cover (5), and a handle (15) is fixedly installed at the end. The guide slide rod (13) is slidably connected to the detection cover (5).

5. The air tightness detection device for a transformer housing according to claim 1, characterized in that: A plurality of evenly distributed self-locking universal wheels (16) are mounted on the bottom edge of the box body (1).

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