Low-voltage bushing for cooling electric furnace transformer

Abstract

The utility model discloses a low-voltage bushing for cooling an electric furnace transformer, which comprises a bushing insulating ring, a bushing body, a connecting ring and a limiting block, the limiting block is arranged at the bottom of the outside of the bushing body, the connecting ring is slidably arranged on the bushing body close to the limiting block, limiting nuts are screwed at two ends of the connecting ring of the bushing body, and the limiting nuts are screwed at two ends of the connecting ring. A first connecting block is welded to the outer portion of the connecting ring, a supporting rod is movably arranged on the first connecting block through a shaft, and a second connecting block is movably arranged at one end of the outer portion of the supporting rod through a shaft. And the supporting rod and the second connecting block are mutually connected through the shaft, so that the fixing block is placed outside the transformer and fixed through the fixing bolt, the stability of the sleeve is improved through the effect of the additional supporting rod, the sleeve is firmly installed, and meanwhile the connecting position of the sleeve and the transformer shell cannot be damaged.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage bushing technology, specifically a low-voltage bushing for cooling electric furnace transformers. Background Technology

[0002] A transformer bushing is a device that allows one or more conductors to pass through an enclosure such as a wall or tank, providing insulation and support. Transformer bushings connect the high-voltage and low-voltage leads inside the transformer to the outside of the tank, serving not only as insulation to ground but also as a means of securing the leads. As one of the current-carrying elements of a transformer, the bushing carries the load current continuously during transformer operation and the short-circuit current when an external short circuit occurs. Therefore, transformer bushings must meet the following requirements: they must possess specified electrical strength and sufficient mechanical strength; they must have good thermal stability and be able to withstand instantaneous overheating during a short circuit; they must be small in size and weight, have good sealing performance, be versatile, and easy to maintain.

[0003] Existing low-voltage bushings, as described in patent CN202120709U, include low-voltage bushings with epoxy resin cast onto the outside of a low-voltage conductive rod. A current transformer is installed on the outside of the bushing, and the bushing with the current transformer is compact and small in size. It can provide current sampling signals for devices requiring current sampling, such as reactive power compensation devices, power distribution control terminals, and low-voltage multi-functional meters. Furthermore, because the transformer and the low-voltage bushing are not integrated, they can be installed independently or compactly together. The low-voltage bushing can be used independently, offering flexibility and convenience for different applications. However, existing bushings are bolted to the transformer, and due to their long length, uneven stress on the bushing can easily lead to damage at the connection between the bushing and the transformer. Utility Model Content

[0004] The purpose of this utility model is to provide a low-voltage bushing for cooling electric furnace transformers to solve the problem mentioned in the background art that the existing bushings are bolted to the transformer, and due to the long length of the bushing, the bushing is prone to uneven stress, which leads to easy damage at the connection between the bushing and the transformer.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-voltage bushing for cooling an electric furnace transformer, comprising a bushing insulating ring, a bushing body, a connecting ring, and a limiting block. The limiting block is provided at the bottom of the outer side of the bushing body. The connecting ring is slidably disposed on the bushing body near the limiting block. Limiting nuts are screwed onto both ends of the connecting ring on the bushing body. A first connecting block is welded to the outside of the connecting ring. A support rod is movably disposed on the first connecting block via a shaft. A second connecting block is movably disposed on one end of the support rod via a shaft. A fixing block is welded to the bottom of the second connecting block. A fixing bolt is movably disposed on the fixing block.

[0006] Preferably, four sets of the first connecting block, support rod, second connecting block and fixing block are arranged outside the connecting ring, and the first connecting block, support rod, second connecting block and fixing block are symmetrical about the center position of the connecting ring.

[0007] Preferably, four sets of fixing bolts are provided on the fixing block, and the fixing bolts are symmetrical about the center position of the fixing block.

[0008] Preferably, the sleeve body is provided with a plurality of sets of sleeve insulating rings on the outside, the bottom of the sleeve body is provided with an installation thread, and the inner wall of the sleeve insulating ring is provided with a conductive sleeve.

[0009] Preferably, a conductive post is threaded onto the top of the sleeve body, and the bottom of the conductive post cooperates with a conductive sleeve inside the sleeve body.

[0010] Preferably, a support nut is screwed onto the top of the conductive post, and a clamping sleeve is fitted around the top of the conductive post near the support nut.

[0011] Preferably, the clamping sleeve is screwed with fastening bolts on its outside, which fix the clamping sleeve to the conductive post. A conductive block is connected to the top of the clamping sleeve, and locking bolts are screwed onto the conductive block. The locking bolts are evenly distributed on the conductive block.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the low-voltage bushing structure for cooling electric furnace transformers is reasonable and has the following advantages:

[0013] (1) By setting a connecting ring, a first connecting block, a support rod, a second connecting block, a fixing block, and fixing bolts, the bushing is not easily damaged at the connection point of the transformer and is installed stably and firmly. Therefore, by setting a first connecting block outside the connecting ring, the first connecting block is connected to the support rod through a shaft, and the support rod and the second connecting block are connected to each other through a shaft. Thus, the fixing block is placed outside the transformer and fixed by fixing bolts. By adding the support rod, the stability of the bushing is increased, the bushing is installed firmly, and the connection point between the bushing and the transformer shell will not be damaged.

[0014] (2) The device is equipped with a clamping sleeve, fastening bolt, conductive block and locking bolt to facilitate the connection of wires. Therefore, when using it, one end of the wire is put into the locking bolt, then the locking bolt is screwed into the conductive block, the clamping sleeve is put on the conductive post, and the fastening bolt is used to fix it. The separate installation makes it convenient to connect the wires to the sleeve. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the left side view of the present invention;

[0017] Figure 3 This is a top-view three-dimensional structural diagram of the present invention;

[0018] Figure 4 This is a right-side perspective stereoscopic view of the present invention.

[0019] Figure 5 This is a three-dimensional structural diagram of the present invention viewed from below.

[0020] In the diagram: 1. Insulating ring of the sleeve; 2. Sleeve body; 3. Limiting block; 4. Mounting thread; 5. Connecting ring; 6. Limiting nut; 7. First connecting block; 8. Support rod; 9. Second connecting block; 10. Fixing block; 11. Fixing bolt; 12. Supporting nut; 13. Clamping sleeve; 14. Fastening bolt; 15. Conductive block; 16. Locking bolt; 17. Conductive post. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figure 1-5 This utility model provides an embodiment of a low-voltage bushing for cooling an electric furnace transformer, comprising a bushing insulating ring 1, a bushing body 2, a connecting ring 5, and a limiting block 3. The limiting block 3 is provided at the bottom of the outer side of the bushing body 2. The connecting ring 5 is slidably provided on the bushing body 2 near the limiting block 3. Limiting nuts 6 are screwed on both ends of the connecting ring 5 on the bushing body 2. A first connecting block 7 is welded to the outside of the connecting ring 5. A support rod 8 is movably provided on the first connecting block 7 via a shaft. A second connecting block 9 is movably provided on one end of the support rod 8 via a shaft. A fixing block 10 is welded to the bottom of the second connecting block 9. A fixing bolt 11 is movably provided on the fixing block 10.

[0023] The fixing block 10 is placed outside the transformer and fixed by the fixing bolt 11. The external support rod 8 increases the stability of the bushing, making the bushing firmly installed, and at the same time, the connection between the bushing and the transformer shell will not be damaged.

[0024] The first connecting block 7, the support rod 8, the second connecting block 9, and the fixing block 10 are arranged in four sets on the outside of the connecting ring 5. The first connecting block 7, the support rod 8, the second connecting block 9, and the fixing block 10 are symmetrical about the center position of the connecting ring 5.

[0025] The fixing bolts 11 are provided in four sets on the fixing block 10. The fixing bolts 11 are symmetrical about the center position of the fixing block 10. Several sets of sleeve insulating rings 1 are provided on the outside of the sleeve body 2. The bottom of the sleeve body 2 is provided with an installation thread 4. The inner wall of the sleeve insulating ring 1 is provided with a conductive sleeve.

[0026] The top of the sleeve body 2 is threaded with a conductive post 17, the bottom of the conductive post 17 cooperates with the conductive sleeve inside the sleeve body 2, the top of the conductive post 17 is screwed with a support nut 12, and the top of the conductive post 17 is fitted with a clamping sleeve 13 near the outside of the support nut 12.

[0027] The clamping sleeve 13 is screwed with a fastening bolt 14 on the outside, which fixes the clamping sleeve 13 to the conductive post 17. The top of the clamping sleeve 13 is connected to a conductive block 15, and a locking bolt 16 is screwed on the conductive block 15. The locking bolts 16 are evenly distributed on the conductive block 15.

[0028] By fitting one end of the wire into the locking bolt 16, then screwing the locking bolt 16 into the conductive block 15, and then fitting the clamping sleeve 13 onto the conductive post 17, and finally fixing it with the fastening bolt 14, a separate installation is adopted, which facilitates the connection of the sleeve to the wire.

[0029] In this embodiment, the connecting ring 5 is fitted onto the outside of the bushing body 2, and then fixed by screwing the limiting nut 6 onto the bushing body 2. The limiting block 3 is then fitted onto the bushing body 2. The bottom of the bushing is screwed into the transformer housing through the installation thread 4. The support rod 8 is then rotated to a suitable position by bending it. The fixing block 10 is then placed outside the transformer and fixed by the fixing bolt 11. The external support rod 8 increases the stability of the bushing, ensuring a secure installation and preventing damage at the connection between the bushing and the transformer housing. The conductive post 17 is then screwed into the bushing body 2, and the support nut 12 is screwed into the conductive post 17. One end of the wire is then fitted into the locking bolt 16, which is then screwed into the conductive block 15. The clamping sleeve 13 is fitted onto the conductive post 17 and fixed by the fastening bolt 14. This separate installation facilitates the connection of the bushing to the wire.

Claims

1. A low-voltage bushing for cooling an electric furnace transformer, characterized in that: The invention comprises a sleeve insulating ring (1), a sleeve body (2), a connecting ring (5) and a limit block (3), wherein a limit block (3) is arranged at the bottom of the sleeve body (2), a connecting ring (5) is slidably arranged at a position close to the limit block (3) on the sleeve body (2), limit nuts (6) are screwed on both ends of the connecting ring (5) of the sleeve body (2), a first connecting block (7) is welded to the outside of the connecting ring (5), a support rod (8) is movably arranged on the first connecting block (7) via an axis, a second connecting block (9) is movably arranged on one end of the support rod (8) via an axis, a fixing block (10) is welded to the bottom of the second connecting block (9), and a fixing bolt (11) is movably arranged on the fixing block (10).

2. A low-voltage bushing for cooling an electric furnace transformer according to claim 1, characterized in that: The first connecting block (7), the supporting rod (8), the second connecting block (9) and the fixing block (10) are arranged in four groups outside the connecting ring (5); the first connecting block (7), the supporting rod (8), the second connecting block (9) and the fixing block (10) are symmetrical about the central position of the connecting ring (5).

3. A low-voltage bushing for cooling an electric furnace transformer according to claim 1, characterized in that: Four groups of fixing bolts (11) are arranged on the fixing block (10), and the fixing bolts (11) are symmetrical about the central position of the fixing block (10).

4. A low-voltage bushing for cooling an electric furnace transformer according to claim 1, characterized in that: A plurality of groups of sleeve insulating rings (1) are arranged outside the sleeve body (2), a mounting thread (4) is provided outside the bottom of the sleeve body (2), and a conductive sleeve is arranged on the inner wall of the sleeve insulating ring (1).

5. A low-voltage bushing for cooling an electric furnace transformer according to claim 1, characterized in that: A conductive column (17) is screwed onto the top of the sleeve body (2) via a thread, and the bottom of the conductive column (17) cooperates with a conductive sleeve inside the sleeve body (2).

6. A low-voltage bushing for cooling an electric furnace transformer according to claim 5, characterized in that: A support nut (12) is screwed onto the top of the conductive column (17), and a clamping sleeve (13) is sleeved on the outside of the top of the conductive column (17) close to the support nut (12).

7. A low-voltage bushing for cooling an electric furnace transformer according to claim 6, characterized in that: A fastening bolt (14) is screwed onto the outside of the clamping sleeve (13), and the fastening bolt (14) fixes the clamping sleeve (13) to the conductive column (17). The top of the clamping sleeve (13) is connected to a conductive block (15), and a locking bolt (16) is screwed onto the conductive block (15). The locking bolts (16) are evenly distributed on the conductive block (15).

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