Dry-type transformer shell

Abstract

The utility model discloses a dry-type transformer shell which comprises a frame, a plurality of side plates installed on the side faces of the frame and a plurality of top plates installed on the top of the frame, ventilation openings are formed in the side plates, rain covers for shielding the ventilation openings are installed on the outer side faces of the side plates, and baffles capable of sealing the ventilation openings are arranged at the corresponding positions of the inner side faces of the side plates. An extension spring for pulling the baffle outwards is connected between the rainproof cover and the baffle, a positioning mechanism for limiting the baffle to move outwards is installed on the inner side face of the side plate, a pressure relief opening is formed in the top plate, a cover plate for covering the pressure relief opening is installed on the top plate, the baffle is opened and the cover plate is closed in the initial state, and the baffle is closed and the cover plate is opened in the arcing explosion process. The internal heat dissipation effect is achieved through the ventilation opening, when an arcing fault occurs, the baffle is closed in time to prevent arcing gas from escaping, the cover plate is opened in time for pressure relief, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a dry-type transformer shell. Background Art

[0002] During the operation of a dry-type transformer, if the humidity of the environment increases, it will cause adverse factors such as power grid failures, and it will also cause flashovers and trigger short-circuit arcs. At this time, high-pressure gas strongly blows open the chamber door or bursts the cabinet body, and the damaged parts are sprayed out of the cabinet at high speed along with the flame, causing serious injuries to the operator and the personnel around the equipment.

[0003] In the prior art, in order to minimize the above risks, the transformer is placed in a fully sealed and pressure-resistant shell, but this method has the disadvantages of poor heat dissipation effect, short service life, and high shell cost of the transformer.

[0004] Therefore, how to provide a dry-type transformer shell with safe heat dissipation is a technical problem that those skilled in the art need to solve at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a dry-type transformer shell, which realizes the internal heat dissipation effect through ventilation openings, and when an arc-fault occurs, the baffle closes in time to prevent the arc gas from escaping, and the cover plate opens in time for pressure relief, improving safety.

[0006] To solve the above technical problem, the utility model provides a dry-type transformer shell, which includes a frame, a plurality of side plates installed on the side surface of the frame, and a plurality of top plates installed on the top of the frame. Ventilation openings are provided on the side plates, a rain shield covering the ventilation openings is installed on the outer side surface of the side plates, a baffle capable of closing the ventilation openings is provided at the corresponding position on the inner side surface of the side plates, a tension spring for pulling the baffle outwards is connected between the rain shield and the baffle, a positioning mechanism for restricting the baffle from moving outwards is installed on the inner side surface of the side plates, a pressure relief opening is provided on the top plate, a cover plate covering the pressure relief opening is installed on the upper surface of the top plate. In the initial state, the baffle is open and the cover plate is closed, and when an arc explosion occurs, the baffle is closed and the cover plate is open.

[0007] Preferably, a rectangular frame surrounding the ventilation opening is installed on the inner side surface of the side plate, the baffle can be embedded in the rectangular frame, the upper or lower side of the rectangular frame is hinged to the upper or lower side of the baffle correspondingly, and the two positioning mechanisms are installed on the two side edges of the rectangular frame.

[0008] Preferably, the positioning mechanism includes a positioning plate and a positioning rod. The outer end of the positioning plate is connected to the rectangular frame. The inner end of the positioning plate is movably installed with the positioning rod. A round head is provided at one end of the positioning rod close to the baffle. It also includes a positioning nut and a locking nut. The positioning nut is fixedly installed on the positioning plate (11). The positioning rod (12) passes through the positioning nut and the locking nut to form a double-nut locking structure and is fixed to the positioning plate (11).

[0009] Preferably, an inner bracket is provided in the middle of the outer side of the baffle, and an outer bracket is provided in the middle of the inner side of the rain shield. The two ends of the tension spring are respectively connected to the inner bracket and the outer bracket. A side torsion spring is provided at the hinge joint between the baffle and the rectangular frame.

[0010] Preferably, a plurality of the ventilation openings and a plurality of the baffles are arranged up and down on the side plate.

[0011] Preferably, a U-shaped sealing plate is installed at the connection of each plate member.

[0012] Preferably, a rectangular frame surrounding the pressure relief opening is installed on the top plate, and one side edge of the cover plate is hinged to the rectangular frame.

[0013] Preferably, two cover plates arranged oppositely are installed on each rectangular frame. Rain grooves and rain flanges are respectively provided on two side edges of the two cover plates close to each other.

[0014] Preferably, a clamping groove is provided at the hinge joint of the cover plate, and a clamping spring is provided in the clamping groove. The cover plate provided with the rain groove is connected to the rectangular frame by positioning bolts or rivets.

[0015] Preferably, the strength of the positioning bolts or the rivets is lower than the strength of the plate installation bolts.

[0016] The utility model provides a dry-type transformer casing, which includes a frame, a plurality of side plates installed on the side of the frame, and a plurality of top plates installed on the top of the frame. Ventilation openings are provided on the side plates. A rain shield for shielding the ventilation openings is installed on the outer side of the side plates. A baffle capable of closing the ventilation openings is provided at the corresponding position on the inner side of the side plates. A tension spring for pulling the baffle outwards is connected between the rain shield and the baffle. A positioning mechanism for restricting the baffle from moving outwards is installed on the inner side of the side plates. A pressure relief opening is provided on the top plate. A cover plate for covering the pressure relief opening is installed on the top of the top plate. In the initial state, the baffle is open and the cover plate is closed. When an arc explosion occurs, the baffle is closed and the cover plate is open.

[0017] There are ventilation openings provided on the side plates to improve the internal heat dissipation performance, and a positioning mechanism is used to keep the ventilation openings open. In case of an arcing fault, under the combined action of the arcing gas and the tension spring, the baffle is timely closed by overcoming the limitation of the positioning mechanism. The closing speed is fast, and the seal is firm after closing, effectively preventing the arcing and explosive gas from escaping through the ventilation openings. Moreover, the cover plate of the pressure relief opening at the top plate is timely opened for pressure relief to prevent the outer shell from bursting, and the gas escapes upward from the top plate, avoiding bursting open in all directions, improving safety and extending the service life. Description of the Drawings

[0018] Figure 1 Figure showing the structural schematic diagram of a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0019] Figure 2 Exploded view of a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0020] Figure 3 Figure showing the structural schematic diagram of the side plate in a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0021] Figure 4 Side view schematic diagram of the side plate in a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0022] Figure 5 Installation schematic diagram of the U-shaped sealing plate in a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0023] Figure 6 Structural schematic diagram of the U-shaped sealing plate in a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0024] Figure 7 Pressure relief schematic diagram of a specific embodiment of the dry-type transformer outer shell provided by the present utility model;

[0025] Figure 8 Structural schematic diagram of the cover plate in a specific embodiment of the dry-type transformer outer shell provided by the present utility model.

[0026] Among them, frame 1, side plate 2, top plate 3, ventilation opening 4, rain shield 5, baffle 6, tension spring 7, pressure relief opening 8, cover plate 9, rectangular frame 10, positioning plate 11, positioning rod 12, inner support 13, outer support 14, side torsion spring 15, U-shaped sealing plate 16, rectangular border 17, rain groove 18, rain folding edge 19, snap ring 20, positioning bolt 21. Specific Embodiment

[0027] The core of the present utility model is to provide a dry-type transformer housing, which realizes the internal heat dissipation effect through ventilation openings. When an arc-fault occurs, the baffle closes in time to prevent the escape of arc gases, and the cover plate opens in time for pressure relief, thus enhancing safety.

[0028] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a specific embodiment of the dry-type transformer housing provided by the present utility model; Figure 2 which is an exploded view of a specific embodiment of the dry-type transformer housing provided by the present utility model.

[0030] The specific embodiment of the present utility model provides a dry-type transformer housing, which includes a frame 1, a plurality of side plates 2 and a plurality of top plates 3. Among them, the frame 1 is formed by splicing a plurality of cross beams, longitudinal beams and vertical beams, a bottom plate is provided at the bottom, a plurality of side plates 2 are surrounded around it, and a plurality of top plates 3 are laid on the top to form a rectangular-like housing, and transformer components etc. are placed inside the housing. Ventilation openings 4 are provided on the side plates 2 for heat dissipation and ventilation inside the housing, and a rain shield 5 is installed on the outer side surface of the side plates 2. The rain shield 5 is installed at the corresponding position of the ventilation openings 4. Specifically, the rain shield 5 is a box body buckled on the ventilation openings 4. Specifically, the inner side and the lower side of the box body are open, and the transverse two side surfaces, the top surface and the outer side surface are closed, so that the rain shield 5 forms a channel from the inner side surface to the lower side surface, and the upper side surface is an inclined surface, which can prevent rain, dust, etc. from entering the inside of the housing and still ensure good ventilation and heat dissipation effects.

[0031] A baffle 6 is provided at the corresponding position on the inner side surface of the side plate 2. The baffle 6 can close the ventilation openings 4. In order to achieve rapid closing, a tension spring 7 is connected between the rain shield 5 and the baffle 6, and a positioning mechanism for restricting the outward movement of the baffle 6 is installed on the inner side surface of the side plate 2. Under normal conditions, the baffle 6 opens inwards, so that the ventilation openings 4 are in an open state, and the positioning mechanism restricts the tension spring 7 from pulling the baffle 6 outwards. Further, a pressure relief opening 8 is provided on the top plate 3, and a cover plate 9 covering the pressure relief opening 8 is installed on the top of the top plate 3. In the initial state, the baffle 6 is open and the cover plate 9 is closed. When an arc explosion occurs, the baffle 6 closes and the cover plate 9 opens.

[0032] A ventilation opening 4 is provided on the side plate 2 to improve the internal heat dissipation performance, and the positioning mechanism is used to keep the ventilation opening 4 open. In the event of an arcing fault, under the combined action of the arcing gas and the tension spring 7, the baffle 6 is forced to close in time, overcoming the limitation of the positioning mechanism. The closing speed is fast, and the seal is firm after closing, effectively preventing the arcing and explosive gas from escaping through the ventilation opening 4. At the same time, the cover plate 9 of the pressure relief opening 8 at the top plate 3 is opened in time for pressure relief, preventing the enclosure from bursting, and the gas escapes upward from the top plate 3, avoiding bursting out in all directions, improving safety and extending the service life.

[0033] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural view of the side plate in a specific embodiment of the dry-type transformer enclosure provided by the present utility model; Figure 4 which is a schematic side view of the side plate in a specific embodiment of the dry-type transformer enclosure provided by the present utility model.

[0034] Specifically, a rectangular frame 10 surrounding the ventilation opening 4 is installed on the inner side surface of the side plate 2, and the baffle 6 can be embedded in the rectangular frame 10. In order to achieve the stable installation of the baffle 6, the upper edge of the baffle 6 can be hinged to the upper edge of the rectangular frame 10, or the lower edge of the baffle 6 can be hinged to the lower edge of the rectangular frame 10, and two positioning mechanisms are installed on the two side edges of the rectangular frame 10 to enable the baffle 6 to rotate around a horizontal axis. Other installation methods can also be adopted, such as the side edge of the baffle 6 is hinged to the side edge of the rectangular frame, and at the same time, the positioning mechanism is installed on the upper and lower edges of the rectangular frame 10.

[0035] Further, the positioning mechanism includes a positioning plate 11 and a positioning rod 12. In this embodiment, the positioning plate is a triangular plate. The outer end of the positioning plate 11 is the base and is connected to the rectangular frame 10. The inner end of the positioning plate 11 is the vertex and the positioning rod 12 is movably installed. A round head is provided at one end of the positioning rod 12 close to the baffle 6 and is fixed to the positioning plate 11 through a locking nut. In the normal state, the tension spring 7 pulls the baffle 6 to move outward, so that the baffle 6 has a tendency to move outward until it stops at the round head of the positioning rod 12 and is blocked by the positioning rod 12. Only when a greater outward pushing force is provided, the baffle 6 breaks through the obstruction of the positioning rod 12 and moves outward until it is embedded in the rectangular frame 10 to completely block the closed ventilation opening 4. A circular groove can also be provided at the corresponding position of the baffle 6 so that the round head of the positioning rod 12 can be stuck in the groove. Among them, a positioning nut and a locking nut are also provided. The positioning nut is fixedly welded to the positioning plate 11, and the positioning rod 12 passes through the positioning nut and the locking nut to achieve threaded connection, forming a double-nut locking structure, so that the positioning rod 12 is fixed at a specific position on the positioning plate 11. The positioning rod 12 is fixed to the positioning plate 11 through the locking nut. After the extended length of the positioning rod 12 can be adjusted, it is fixed and locked through the locking nut. According to the extended length of the positioning rod 12, the magnitude of the closing trigger force of the baffle 6 is set. Of course, other positioning methods can also be adopted, such as setting a slide rail and other structures, which are all within the protection scope of the present utility model.

[0036] Specifically, an inner bracket 13 is provided in the middle of the outer side of the baffle 6, and an outer bracket 14 is provided in the middle of the inner side of the rain cover 5. The two ends of the tension spring 7 are respectively connected to the inner bracket 13 and the outer bracket 14. A side torsion spring 15 is provided at the hinge joint of the baffle 6 and the rectangular frame 10 to further assist the baffle 6 to move outward. During processing, a rectangular opening is provided at the corresponding position of the side plate 6, and a rectangular frame 10 matching the size of the rectangular opening is provided on the inner side of the side plate 6, so that the rectangular frame 10 is arranged around the rectangular opening. Then a grille plate is provided in the rectangular opening, and an opening is provided in the middle of the grille plate, which is the ventilation opening 4. The tension spring 7 passes through the ventilation opening 4 and is respectively connected to the outer side of the baffle 6 and the inner side of the rain cover 5.

[0037] In order to improve the ventilation effect, a plurality of ventilation openings 4 and a plurality of baffles 6 are arranged up and down on the side plate 2. Preferably, two ventilation openings 4 and two baffles 6 are arranged up and down on the normal side plate 2, and the lower side of the upper baffle 6 is hinged to the lower side of the rectangular frame 10, and the upper side of the lower baffle 6 is hinged to the upper side of the rectangular frame 10, and the two baffles 6 are opened away from each other. If components such as a cabinet door are provided on the side plate 2, only one ventilation opening 4 and baffle are provided, and more ventilation openings 4 can also be provided according to the situation, and the arrangement method of the baffle 6 can be adjusted, which are all within the protection scope of the present utility model.

[0038] Please refer to Figure 5 and Figure 6 ,Figure 5 Schematic diagram of the installation of the U-shaped sealing plate in a specific embodiment of the dry-type transformer housing provided by the present utility model; Figure 6 Schematic diagram of the structure of the U-shaped sealing plate in a specific embodiment of the dry-type transformer housing provided by the present utility model.

[0039] In the dry-type transformer housing provided by the specific embodiment of the present utility model, a U-shaped sealing plate 16 is installed at the connection of each plate member. The U-shaped sealing plate 16 is connected to each plate member by bolts, so that the interior of the housing is a fully sealed anti-arc chamber to prevent high-temperature deflagration gas from escaping from the connection gap to the outside of the housing.

[0040] Please refer to Figure 7 and Figure 8 , Figure 7 Schematic diagram of pressure relief in a specific embodiment of the dry-type transformer housing provided by the present utility model; Figure 8 Schematic diagram of the structure of the cover plate in a specific embodiment of the dry-type transformer housing provided by the present utility model.

[0041] Based on the dry-type transformer housing provided in the above specific embodiments, a rectangular frame 17 surrounding the pressure relief port 8 is installed on the top plate 3, forming a pressure relief channel connecting the interior of the housing and the outside world. Among them, one side edge of the cover plate 9 is hinged to the rectangular frame 17, and the cover plate 9 flips open during pressure relief. The number of the pressure relief port 8 and the rectangular frame 17 is one or more, and the height of the rectangular frame 17 is more than 2 m from the ground horizontal distance to ensure safety.

[0042] Further, two cover plates 9 arranged oppositely are installed on each rectangular frame 17, and rain-proof grooves 18 and rain-proof flanges 19 are respectively arranged on two side edges of the two cover plates 9 close to each other. The width of the rain-proof groove 18 is greater than that of the rain-proof flange 19 to ensure that the cover plate 9 can be opened without interference.

[0043] A clamping groove is arranged at the hinge of the cover plate 9, and a clamping spring 20 is arranged in the clamping groove to prevent the cover plate 9 from flying out during arc combustion explosion. At the same time, the cover plate 9 provided with the rain-proof groove 18 is connected to the rectangular frame 17 by a positioning bolt 21 or a rivet. The positioning bolt 21 generally uses a non-metallic material, and the strength of the positioning bolt 21 or the rivet is lower than that of the plate member installation bolt, so as to ensure that the positioning bolt 21 breaks first before the plate member installation bolt during arc combustion explosion, so that the cover plate 9 can be opened smoothly. The number, arrangement mode and connection mode of each component can also be adjusted according to the situation, such as using a circular frame or other polygonal frames, etc., and matching the cover plate 9 with the corresponding shape is fine, all within the protection scope of the present utility model.

[0044] The dry-type transformer housing provided by the specific embodiment of the present utility model has two application methods. One is to directly arrange it using the structure of the above-mentioned embodiment, and the other is to set mounting holes on the rectangular frame 17, through which a separate pressure relief channel can be connected.

[0045] The above has introduced in detail the dry-type transformer housing provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A dry-type transformer housing, comprising a frame (1), a plurality of side plates (2) mounted on the side of the frame (1), and a plurality of top plates (3) mounted on the top of the frame (1), characterized in that, A ventilation opening (4) is provided on the side plate (2). A rain shield (5) for shielding the ventilation opening (4) is installed on the outer side surface of the side plate (2). A baffle (6) capable of closing the ventilation opening (4) is provided at a corresponding position on the inner side surface of the side plate (2). A tension spring (7) for pulling the baffle (6) outwards is connected between the rain shield (5) and the baffle (6). A positioning mechanism for restricting the outward movement of the baffle (6) is installed on the inner side surface of the side plate (2). A pressure relief opening (8) is provided on the top plate (3). A cover plate (9) covering the pressure relief opening (8) is installed on the upper surface of the top plate (3). In the initial state, the baffle (6) is open and the cover plate (9) is closed. During an arc ignition explosion, the baffle (6) is closed and the cover plate (9) is open.

2. The dry-type transformer housing according to claim 1, characterized in that, A rectangular frame (10) surrounding the ventilation opening (4) is installed on the inner side surface of the side plate (2). The baffle (6) can be embedded into the rectangular frame (10). The upper or lower side of the rectangular frame (10) is correspondingly hinged to the upper or lower side of the baffle (6). The two positioning mechanisms are installed on the two side edges of the rectangular frame (10).

3. The dry-type transformer housing according to claim 2, characterized in that, The positioning mechanism includes a positioning plate (11) and a positioning rod (12). The outer end of the positioning plate (11) is connected to the rectangular frame (10). The inner end of the positioning plate (11) is movably installed with the positioning rod (12). A round head is provided at one end of the positioning rod (12) close to the baffle (6). A positioning nut and a locking nut are also included. The positioning nut is fixedly installed on the positioning plate (11). The positioning rod (12) passes through the positioning nut and the locking nut to form a double-nut locking structure and is fixed to the positioning plate (11).

4. The dry-type transformer housing according to claim 3, characterized in that, An inner bracket (13) is provided in the middle of the outer side surface of the baffle (6). An outer bracket (14) is provided in the middle of the inner side surface of the rain shield (5). The two ends of the tension spring (7) are respectively connected to the inner bracket (13) and the outer bracket (14). A side torsion spring (15) is provided at the hinge joint between the baffle (6) and the rectangular frame (10).

5. The dry-type transformer enclosure according to claim 4, wherein A plurality of the ventilation openings (4) and a plurality of the baffles (6) are arranged vertically on the side plate (2).

6. The dry-type transformer housing according to claim 1, wherein, A U-shaped sealing plate (16) is installed at the connection of each plate member.

7. The dry-type transformer housing according to any one of claims 1 to 6, characterized in that, A rectangular border (17) surrounding the pressure relief opening (8) is installed on the upper surface of the top plate (3). One side edge of the cover plate (9) is hinged to the rectangular border (17).

8. The dry-type transformer enclosure according to claim 7, characterized in that, Two cover plates (9) are arranged oppositely on each rectangular border (17). Rain grooves (18) and rain folding edges (19) are respectively provided on the two side edges of the two cover plates (9) close to each other.

9. The dry-type transformer housing according to claim 8, characterized in that, A clamping groove is provided at the hinge joint of the cover plate (9). A clamping spring (20) is provided in the clamping groove. The cover plate (9) provided with the rain groove (18) is connected to the rectangular border (17) by a positioning bolt (21) or a rivet.

10. The dry-type transformer housing according to claim 9, characterized in that, The strength of the positioning bolt (21) or the rivet is lower than the strength of the plate member installation bolt.

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