Novel cable terminal sleeve with dry-type structure

Abstract

The utility model discloses a novel dry-type structure cable terminal sleeve, which comprises a conical hollow composite insulator, a conducting rod, a stress cone, a gland and a locking nut, the conducting rod is inserted into the conical hollow composite insulator from the large opening end of the conical hollow composite insulator, the gland is fixed at the small opening end of the conical hollow composite insulator, and the stress cone is inserted into the gland. The locking nut is in threaded connection with the conducting rod and arranged on the outer side of the gland, the conducting rod is axially positioned in the conical hollow composite insulator through the gland and the locking nut, epoxy resin is poured into the conical hollow composite insulator to form a resin filling layer, and the stress cone is arranged in the conical hollow composite insulator and is connected with the conducting rod in an inserted mode. According to the utility model, a brand-new assembly structure is arranged, the conducting rod is fixed through the gland, the fastening effect is ensured, the sealing effect is also considered, the use effect is good, the conducting rod and the gland are convenient to manufacture, and batch processing is facilitated.

Description

Technical Field

[0001] The utility model relates to a cable terminal bushing with a novel dry structure. Background Art

[0002] Traditional cable terminal bushings generally consist of insulators, conductive rods and encapsulated insulating oil. Such traditional bushings are prone to insulating oil leakage, which in turn cannot ensure the long-term reliability and stability of the internal insulation. In severe cases, the internal insulation of the bushing is lost and internal breakdown occurs. Therefore, it is necessary to improve the existing technology to solve the deficiencies of the existing technology. Summary of the Invention

[0003] The utility model provides a cable terminal bushing with a novel dry structure to solve the problems existing in the above-mentioned prior art.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A cable terminal bushing with a novel dry structure includes a conical hollow composite insulator, a conductive rod, a stress cone, a gland and a locking nut. The conductive rod is inserted into the conical hollow composite insulator from the large-mouth end of the conical hollow composite insulator. The gland is fixed to the small-mouth end of the conical hollow composite insulator. The locking nut is threadedly connected to the conductive rod and is placed outside the gland. The gland and the locking nut axially position the conductive rod within the conical hollow composite insulator. Epoxy resin is poured into the conical hollow composite insulator to form a resin filling layer. The stress cone is placed within the conical hollow composite insulator and is inserted into the conductive rod.

[0006] Further, the gland includes a limiting cover and an upper flange. The upper flange is fixed to the conical hollow composite insulator. A stepped surface is provided on the conductive rod. The limiting cover is fixedly connected to the upper flange and abuts against the stepped surface of the conductive rod. The locking nut is placed outside the limiting cover.

[0007] Further, a sealing ring is formed between the limiting cover and the stepped surface of the conductive rod.

[0008] Further, a straight pipe portion is provided at the small port of the conical hollow composite insulator. A sealing portion adapted to the straight pipe portion is provided on the conductive rod. Step surfaces are formed at both ends of the sealing portion.

[0009] Further, a lead hole is provided on the limiting cover.

[0010] Further, a flange is fixed to the conical hollow composite insulator. The gland and the flange axially position the conical hollow composite insulator on the conical hollow composite insulator.

[0011] The utility model has the following beneficial effects:

[0012] The utility model is provided with a brand-new assembly structure. The conductive rod is fixed by a gland, which can ensure the fastening effect while taking into account the sealing effect. The use effect is good, and the conductive rod and the gland are easy to manufacture and convenient for batch processing.

[0013] The utility model cures the composite epoxy resin glue by post-potting to form an epoxy resin filling layer, so that there is no gap inside the bushing. Since the composite epoxy resin glue is cured to form the epoxy resin filling layer, the risk of leakage and seepage of the traditional oil-filled or gas-filled bushing is overcome, and the long-term reliable and stable operation of the bushing can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model.

[0015] Figure 2 It is a partially enlarged view of the utility model. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following further describes the utility model with reference to the drawings.

[0017] As Figure 1 and Figure 2 shown, a cable terminal bushing with a new dry structure of the utility model includes a conical hollow composite insulator 1, a conductive rod 2, a stress cone 3, a gland 4 and a lock nut 5.

[0018] The conductive rod 2 is inserted into the conical hollow composite insulator 1 from the large end of the conical hollow composite insulator 1. The gland 4 is fixed to the small end of the conical hollow composite insulator 1. The lock nut 5 is threadedly connected to the conductive rod 2 and is placed outside the gland 4. The gland 4 and the lock nut 5 axially position the conductive rod 2 in the conical hollow composite insulator 1. Epoxy resin is poured into the conical hollow composite insulator 1 to form a resin filling layer 7. The stress cone 3 is placed in the conical hollow composite insulator 1 and is inserted into the conductive rod 2.

[0019] The gland 4 in the utility model includes a limit cover 41 and an upper flange 42. The upper flange 42 is fixed to the conical hollow composite insulator 1. A stepped surface is provided on the conductive rod 2. The limit cover 41 is fixedly connected to the upper flange 42, and the limit cover 41 abuts against the stepped surface of the conductive rod 2. The lock nut 5 is placed outside the limit cover 41.

[0020] A sealing ring is formed between the limit cover 41 and the stepped surface of the conductive rod 2 to ensure the sealing performance at this place.

[0021] When pouring epoxy resin, in order to further prevent the resin from flowing out of the small port of the conical hollow composite insulator 1, a straight pipe portion 11 is provided at the small port of the conical hollow composite insulator 1, and a sealing portion 21 adapted to the straight pipe portion 11 is provided on the conductive rod 2. Step surfaces are formed at both ends of the sealing portion 21. The sealing portion 21 is adapted to the straight pipe portion 11 to reduce the epoxy resin from flowing out between the sealing portion 21 and the straight pipe portion 11, forming the first seal. Then, in cooperation with the sealing ring in the gland 4, a better sealing effect is thus formed.

[0022] A lead hole 43 is provided on the limit cover 41. The lead hole is used for detecting the operating state of the bushing by leading a wire.

[0023] A flange 8 is fixed on the outer wall of the large end of the conical hollow composite insulator 1. The gland 4 and the flange 8 axially position the conical hollow composite insulator 1 on the conical hollow composite insulator 1.

[0024] When assembling the utility model, the steps are as follows:

[0025] 1. Insert the conductive rod 2 into the small end of the conical hollow composite insulator 1 (with the shielding end downward), successively install the limit cover, the sealing ring and the upper flange 42, and lock the limit cover and the upper flange with M12 bolts. Finally, lock the locking nut to lock the conductive rod.

[0026] 2. Invert the conical hollow composite insulator, fix the central potting tooling, and insert the end into the bell mouth of the conductive rod for positioning (i.e., the stress cone).

[0027] 3. Under the condition that the bushing is inverted, pour in epoxy resin (vacuum potting): Before potting, open the air release valve, connect the vacuum pump, and then pot until the epoxy resin flows out of the air release valve, and tighten the air release valve. After the epoxy resin cures, remove the potting tooling.

[0028] In order to ensure that there is no gas between the inside of the bushing, that is, between the conductive rod and the inner wall of the hollow composite insulator, before pouring the composite epoxy resin glue, open the air release valve on the gland to exhaust air until the glue flows out, immediately block the exhaust port with a plug, and then continue to pour the composite epoxy resin glue until it is flush with the lower flange surface of the hollow composite insulator. Finally, cure it into an epoxy resin filling layer.

[0029] 4. Clean the residual glue at the end and the appearance of the product.

[0030] The above is only the preferred embodiment of the utility model. It should be pointed out that for those of ordinary skill in the art, several improvements can be made without departing from the principle of the utility model, and these improvements should also be regarded as the protection scope of the utility model.

Claims

1. A new type of dry-type cable terminal bushing, characterized in that: The invention comprises a conical hollow composite insulator (1), a conductive rod (2), a stress cone (3), a gland (4) and a locking nut (5), wherein the conductive rod (2) is inserted into the conical hollow composite insulator (1) from the large end of the conical hollow composite insulator (1), the gland (4) is fixed to the small end of the conical hollow composite insulator (1), the locking nut (5) is threadedly connected to the conductive rod (2) and is placed on the outside of the gland (4), the gland (4) and the locking nut (5) axially position the conductive rod (2) in the conical hollow composite insulator (1), epoxy resin is poured into the conical hollow composite insulator (1) to form a resin filling layer (7), the stress cone (3) is placed in the conical hollow composite insulator (1) and is plugged into the conductive rod (2).

2. The cable terminal sleeve of the novel dry structure as claimed in claim 1 is characterized in that: The gland (4) comprises a limit cover (41) and an upper flange (42), the upper flange (42) being fixed on the conical hollow composite insulator (1), a step surface being provided on the conductive rod (2), the limit cover (41) being fixedly connected to the upper flange (42), the limit cover (41) being in contact with the step surface of the conductive rod (2), and the locking nut (5) being disposed on the outer side of the limit cover (41).

3. The cable terminal sleeve of the novel dry structure as claimed in claim 2 is characterized in that: A sealing ring is formed between the limiting cover (41) and the step surface of the conductive rod (2).

4. The cable terminal sleeve of the novel dry structure as claimed in claim 2 is characterized in that: The small end of the conical hollow composite insulator (1) is provided with a straight tube portion (11), and a sealing portion (21) adapted to the straight tube portion (11) is provided on the conductive rod (2), and both ends of the sealing portion (21) form step surfaces.

5. The cable terminal sleeve of the novel dry structure as claimed in claim 2 is characterized in that: The limiting cover (41) is provided with a lead-in hole (43).

6. The cable terminal sleeve of the novel dry structure as claimed in claim 1, characterized in that: A flange (8) is fixed on the conical hollow composite insulator (1), and the gland (4) and the flange (8) axially position the conical hollow composite insulator (1) on the conical hollow composite insulator (1).

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