Transformer insulation bushing anti-condensation moisture-proof sealing structure

Abstract

The utility model discloses a transformer insulation bushing dampproof sealing structure of anti -condensation, including bushing body still includes sealing assembly and dampproof component, sealing assembly installs at bushing body top, dampproof component installs at bushing body surface, dampproof component adjusts bushing body inside and outside air pressure, adjusts internal air pressure and outside air pressure when bushing body inside air pressure reduces, the utility model discloses the air pressure of bushing body inside and outside environment is adjusted to sealing valve, prevents the unbalance situation of bushing body inside and outside environment due to climate temperature change, and the water vapor etc. in outside environment can enter bushing body inside, influence the use of bushing body, in addition, the filter seat is provided to the outer end of breathing valve, and the movable seat with three sets of filter screen is detachably connected in the filter seat, and the water vapor in the air is filtered through the filter screen, and the dry effect of the gas into the bushing body inside is ensured.

Description

Technical Field

[0001] This utility model relates to the field of transformer insulating bushing technology, specifically to a moisture-proof and sealing structure for transformer insulating bushings that prevents condensation. Background Technology

[0002] A transformer is an electrical device that uses the principle of electromagnetic induction to change alternating voltage and current. It is widely used in power transmission, distribution, and electronic circuits. The transformer bushing is a crucial component, used to lead the high-voltage conductors from the transformer enclosure while ensuring insulation and sealing to ground. It plays multiple roles in power systems, providing electrical connection, mechanical fixation, and insulation protection.

[0003] The sealing performance of transformer insulating bushings directly affects the operation of transformers. Some transformer insulating bushings achieve radial sealing by installing rubber sealing rings between the bushing flange and the transformer tank, while others achieve axial sealing by filling the space between the conductor and the porcelain bushing with curing material. However, the environmental conditions in which transformers are used vary greatly, and the sealing components may age, requiring timely replacement of the sealing components.

[0004] During the replacement process, when the sealing performance of the sealing components deteriorates, factors such as diurnal temperature variations and seasonal temperature differences can cause a pressure imbalance between the inside of the transformer insulating bushing and the external environment. When the external air pressure is higher than the internal air pressure of the insulating bushing, hot air or moisture from the outside environment can enter the insulating bushing, forming condensation inside. This severely affects its insulation performance and long-term reliability, and may even lead to major failures. Therefore, a moisture-proof sealing structure for transformer insulating bushings to prevent condensation is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a moisture-proof and sealing structure for transformer insulating bushings to prevent condensation, thereby solving the problem mentioned in the background art where, due to factors such as day-night temperature differences and seasonal temperature differences, there is an imbalance in air pressure between the inside of the transformer insulating bushing and the external environment. When the air pressure of the external environment is higher than the air pressure inside the insulating bushing, hot air or water vapor from the external environment will enter the inside of the insulating bushing, forming condensation inside, which will seriously affect its insulation performance and long-term reliability, and may even cause major failures.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A moisture-proof sealing structure for transformer insulating bushings to prevent condensation includes a bushing body, a sealing component, and a moisture-proof component. The sealing component is installed on the top of the bushing body, and the moisture-proof component is installed on the surface of the bushing body. The moisture-proof component adjusts the air pressure inside and outside the bushing body, and adjusts the internal air pressure to match the external air pressure when the internal air pressure of the bushing body decreases.

[0008] Preferably, the moisture-proof component includes a fixing frame, a breather valve, a round tube, a filter seat, and a one-way valve. The fixing frame is embedded on the surface of the sleeve body. The outer sleeve round tube of the fixing frame is connected to the filter seat. A one-way valve is installed on the outside of the filter seat. A breather valve is provided in the middle of the round tube.

[0009] Preferably, the bottom of the filter seat is detachably connected to a movable seat, the movable seat has three equally spaced filter screens installed inside, the movable seat has symmetrical pin holes on its side, and the filter seat has a threaded groove at the contact position with the movable seat.

[0010] Preferably, the filter base has symmetrical circular holes on its surface, and a pin is inserted into the circular hole. The pin passes through the pin hole, and a screw is welded to the end of the pin. The screw is connected to the threaded groove.

[0011] Preferably, the sealing assembly includes a limiting sleeve, rubber pads, a membrane, and sealing rings. The limiting sleeve is fitted onto the top of the sleeve body, the inner wall of the limiting sleeve is provided with three rubber pads, the top of the limiting sleeve is provided with three sealing rings, adjacent sealing rings are connected by a membrane, and the bottom sealing ring is connected to the limiting sleeve by a membrane.

[0012] Preferably, the outer wall of the limiting sleeve is connected to a locking block by an elastic band around its perimeter, and the locking block is engaged with the outer end skirt of the sleeve body.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model provides a limiting sleeve with three rubber pads on the inner wall of the top of the sleeve body. Three sealing rings are provided on the top of the limiting sleeve. Thin films are provided between adjacent sealing rings and between the bottom sealing ring and the limiting sleeve. The three sealing rings work together to seal the inner wall of the sleeve body. The outer wall of the limiting sleeve is connected to a locking block by an elastic band. The locking block engages with the skirt position at the outer end of the sleeve body, which strengthens the connection between the limiting sleeve and the sleeve body and facilitates the replacement of the limiting sleeve and the sealing rings as a whole.

[0015] 2. This utility model features a fixed bracket on the surface of the casing body connecting to a circular tube equipped with a breather valve. The breather valve regulates the air pressure inside and outside the casing body, preventing imbalances due to temperature changes. When the internal air pressure is lower than the external pressure and the casing body is poorly sealed, moisture from the external environment can enter the casing body, affecting its moisture-proof performance. Additionally, a filter seat is installed at the outer end of the circular tube. Inside the filter seat, a movable seat with three sets of filter screens is detachably connected. A one-way valve is installed at the outer end of the filter seat. When the breather valve is operating, it connects to the external environment, allowing the filter screens to filter moisture from the air, ensuring the dryness of the gas entering the casing body. The movable seat is detachably connected to the filter seat via a pin, facilitating the removal and replacement of the filter screens. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of the sealing assembly according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the disassembled structure of the moisture-proof component according to an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the pin structure according to an embodiment of the present utility model.

[0020] In the diagram: 1. Sleeve body; 2. Clamping block; 3. Elastic band; 4. Limiting sleeve; 5. Rubber pad; 6. Membrane; 7. Sealing ring; 8. Fixing bracket; 9. Breathing valve; 10. Round tube; 11. Filter seat; 12. Round hole; 13. One-way valve; 14. Pin hole; 15. Threaded groove; 16. Filter screen; 17. Movable seat; 18. Screw; 19. Pin shaft. Detailed Implementation

[0021] To facilitate the solution of the problem, this utility model provides a moisture-proof and sealing structure for transformer insulating bushings to prevent condensation. The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] Example

[0023] like Figures 1 to 4As shown, this embodiment provides a moisture-proof and sealing structure for transformer insulating bushings to prevent condensation. It includes the bushing body 1. Common insulating bushings include porcelain insulating bushings and composite insulating bushings. Porcelain insulating bushings are primarily made of electrical porcelain (high-frequency porcelain), and the outer layer is usually glazed to improve anti-fouling and waterproof performance. The installation position of the insulating bushing depends on the type and functional requirements of the transformer. For example, the high-voltage side (HV) bushing of an oil-immersed transformer is usually located on the top or side of the tank, connecting the high-voltage winding leads to the power grid. In contrast, the epoxy resin cast bushing of a dry-type transformer is directly embedded at the winding leads in an oil-free environment, allowing for more flexible installation (e.g., on the side wall or top). The structure also includes a seal. The bushing includes a sealing component installed on top of the bushing body 1 and a moisture-proof component installed on the surface of the bushing body 1. The moisture-proof component regulates the air pressure inside and outside the bushing body 1. When the air pressure inside the bushing body 1 decreases, it adjusts the internal air pressure to match the external air pressure, thus preventing air pressure imbalance between the inside and outside environment of the transformer insulating bushing due to factors such as day-night temperature differences and seasonal temperature differences. When the external air pressure is higher than the internal air pressure of the insulating bushing, hot air or water vapor from the external environment will enter the insulating bushing and form condensate inside, which will seriously affect its insulation performance and long-term reliability, and may even cause major failures.

[0024] Reference Figure 1 , Figure 3 and Figure 4 In one embodiment of this utility model, the moisture-proof component specifically includes a fixing frame 8, a breather valve 9, a circular tube 10, a filter seat 11, and a one-way valve 13. The fixing frame 8 is embedded in the surface of the sleeve body 1. The outer sleeve circular tube 10 of the fixing frame 8 is connected to the filter seat 11. A one-way valve 13 is installed on the outer side of the filter seat 11. The one-way valve 13 is connected to the circular tube 10 and the breather valve 9 through the filter seat 11. When the breather valve 9 is operating, the one-way valve 13 is open; when the breather valve 9 stops operating, the one-way valve 13 is closed. The one-way valve 13 opens and closes based on the pressure difference of the fluid itself. No external control is required. A breather valve 9 is provided in the middle of the circular tube 10. The circular tube 10 is connected to the breather valve 9 outside the casing body 1. The breather valve 9 operates when there is an imbalance between the air pressure inside the casing body 1 and the external environment. Specifically, when the air pressure inside the casing body 1 decreases, it adjusts the internal air pressure to match the external air pressure. The breather valve 9 regulates the air pressure inside the casing body 1 and the external environment to prevent moisture from entering the casing body 1 when the air pressure inside the casing body 1 is lower than that of the external environment and the casing body 1 is not properly sealed, thus affecting the moisture-proof performance of the casing body 1.

[0025] Reference Figure 1 and Figure 3In one embodiment of this utility model, specifically, a movable seat 17 is detachably connected to the bottom of the filter base 11. Three equally spaced filter screens 16 are installed inside the movable seat 17. The filter screens 16 are semi-permeable membrane type filters, utilizing selective permeability membranes to block water molecules while allowing gas to pass through (such as ePTFE membranes). Symmetrical pin holes 14 are provided on the side of the movable seat 17. A threaded groove 15 is provided at the contact position between the filter base 11 and the movable seat 17. Symmetrical circular holes 12 are provided on the surface of the filter base 11, and a pin 19 is inserted into the circular hole 12, with the pin 19 penetrating through the hole. A screw 18 is welded to the end of the hole 14 and the pin 19. The screw 18 is connected to the threaded groove 15. A filter seat 11 is set at the outer end of the round tube 10. The filter seat 11 is detachably connected to a movable seat 17 with three sets of filter screens 16. A one-way valve 13 is set at the outer end of the filter seat 11. When the breather valve 9 is running, it connects to the external environment through the one-way valve 13, and then filters the water vapor in the air through the filter screens 16 to ensure the dryness of the gas entering the sleeve body 1. The movable seat 17 is detachably connected to the filter seat 11 through the pin 19, which facilitates the removal and replacement of the filter screens 16.

[0026] Reference Figure 1 and Figure 2 In one embodiment of this utility model, the sealing assembly includes a limiting sleeve 4, rubber pads 5, a film 6, and sealing rings 7. The limiting sleeve 4 is fitted on the top of the sleeve body 1. Three rubber pads 5 are provided on the inner wall of the limiting sleeve 4. Three sealing rings 7 are provided on the top of the limiting sleeve 4. The outermost sealing ring 7 is made of UV-resistant silicone rubber. The middle sealing ring 7 is set as a conductive shielding layer to uniformly distribute the electric field, reduce partial discharge, and prevent the accumulation of charge on the surface of the insulating material. Specifically, a semiconductor polymer material, such as cross-linked polyethylene (XLPE) mixed with conductive particles, can be selected. The inner sealing ring 7 is made of oil-resistant fluororubber. Adjacent sealing rings 7 are connected by the film 6, and the bottom sealing ring 7 is connected to the limiting sleeve 4 by the film 6. A limiting sleeve 4 with three rubber pads 5 on the inner wall is set on the top of the sleeve body 1. Three sealing rings 7 are set on the top of the limiting sleeve 4. Films 6 are set between adjacent sealing rings 7 and between the bottom sealing ring 7 and the limiting sleeve 4. The three sealing rings 7 together seal the inner wall of the sleeve body 1.

[0027] Reference Figure 1 As one embodiment of this utility model, specifically, the outer wall of the limiting sleeve 4 is connected to the locking block 2 by the elastic band 3. The locking block 2 is engaged with the outer skirt of the sleeve body 1. The outer wall of the limiting sleeve 4 is connected to the locking block 2 by the elastic band 3. The elastic band 3 is made of silicone rubber. The locking block 2 is engaged with the skirt of the outer end of the sleeve body 1, which strengthens the connection between the limiting sleeve 4 and the sleeve body 1, and facilitates the replacement of the limiting sleeve 4 and the sealing ring 7 as a whole.

[0028] Working principle: The movable seat 17 is connected to the filter seat 11 by the pin 19. The breather valve 9 regulates the air pressure inside the sleeve body 1 and the external environment to prevent water vapor from entering the sleeve body 1 when the air pressure inside the sleeve body 1 is lower than that of the external environment and the internal seal of the sleeve body 1 is not good. When the breather valve 9 is running, the one-way valve 13 opens, and water vapor and hot air in the air enter the filter seat 11 through the one-way valve 13. After the water vapor in the air is filtered by the filter screen 16 inside the filter seat 11, the dry gas enters the sleeve body 1 through the round tube 10 for air pressure regulation. The limiting sleeve 4 is snapped on the top of the sleeve body 1. The three sealing rings 7 on the top of the limiting sleeve 4 seal the inner wall of the sleeve body 1 together. At the same time, a thin film 6 is set between adjacent sealing rings 7 and between the bottom sealing ring 7 and the limiting sleeve 4 for sealing.

[0029] Specifically, the movable seat 17 is snapped onto the bottom of the filter seat 11. Two pins 19 are passed through the round hole 12 and the pin hole 14. Then, the pins 19 are rotated so that the screw 18 at its end is threaded into the threaded groove 15 inside the filter seat 11, completing the installation of the movable seat 17 and the filter seat 11. The pins 19 are rotated in the opposite direction to disengage the screw 18 from the threaded groove 15. The pins 19 can then be pulled out to disassemble and replace the movable seat 17 and the filter screen 16. When the breather valve 9 is working, the one-way valve 13 opens, allowing water vapor and hot air in the air to pass through the one-way valve 13. 3. Enter the filter seat 11. After the water vapor in the air is filtered by the filter screen 16 inside the filter seat 11, it enters the sleeve body 1 through the round tube 10 for air pressure adjustment. The limiting sleeve 4 is put on the top of the sleeve body 1. Pull the locking block 2 to engage with the skirt position at the outer end of the sleeve body 1 to complete the installation and reinforcement of the limiting sleeve 4 and the sleeve body 1. Similarly, the limiting sleeve 4 can be disassembled by removing the locking block 2 from the skirt of the sleeve body 1. The limiting sleeve 4, together with the three sealing rings 7 and the membrane 6, seals the inner wall of the sleeve body 1.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A moisture-proof sealing structure of a transformer insulation bushing against condensate water, comprising a bushing body (1), characterized in that: It also includes a sealing component and a moisture-proof component. The sealing component is installed on the top of the sleeve body (1), and the moisture-proof component is installed on the surface of the sleeve body (1). The moisture-proof component adjusts the air pressure inside and outside the sleeve body (1) and adjusts the internal air pressure to be consistent with the external air pressure when the internal air pressure of the sleeve body (1) decreases. The moisture-proof component includes a fixing frame (8), a breathing valve (9), a round tube (10), a filter seat (11), and a one-way valve (13). The fixing frame (8) is embedded on the surface of the sleeve body (1). The outer sleeve round tube (10) of the fixing frame (8) is connected to the filter seat (11). The one-way valve (13) is installed on the outside of the filter seat (11). The breathing valve (9) is provided in the middle of the round tube (10).

2. The condensation-proof transformer insulation bushing moisture seal structure according to claim 1, characterized in that: The bottom of the filter seat (11) is detachably connected to a movable seat (17). Three equally spaced filter screens (16) are installed inside the movable seat (17). Symmetrical pin holes (14) are opened on the side of the movable seat (17). A threaded groove (15) is opened at the contact position between the filter seat (11) and the movable seat (17).

3. The condensation-proof transformer insulation bushing moisture seal according to claim 2, wherein: The filter base (11) has symmetrical circular holes (12) on its surface. A pin (19) is inserted into the circular hole (12). The pin (19) passes through the pin hole (14). A screw (18) is welded to the end of the pin (19). The screw (18) is connected to the threaded groove (15).

4. The condensation-proof transformer insulation bushing moisture seal structure of claim 1, wherein: The sealing assembly includes a limiting sleeve (4), a rubber pad (5), a membrane (6) and a sealing ring (7). The limiting sleeve (4) is fitted on the top of the sleeve body (1). The inner wall of the limiting sleeve (4) is provided with three rubber pads (5). The top of the limiting sleeve (4) is provided with three sealing rings (7). The adjacent sealing rings (7) are connected by the membrane (6), and the bottom sealing ring (7) is connected to the limiting sleeve (4) by the membrane (6).

5. The condensation-proof transformer insulation bushing moisture seal structure according to claim 4, characterized in that: The outer wall of the limiting sleeve (4) is connected to a locking block (2) by an elastic band (3), and the locking block (2) is engaged with the outer skirt of the sleeve body (1).

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