Air leakage prevention casing pipe with sealing ring

Abstract

The utility model discloses an air leakage prevention sleeve with a sealing ring, which comprises a fitting and an insulating body, the fitting comprises a cylindrical part at the front end and a conical part at the rear end, and the front end of the insulating body wraps the middle rear part of the cylindrical part and all the conical parts; a fine sand layer and a semi-conductive adhesive layer are sprayed on the portion, wrapped by the insulating body, of the hardware fitting, a plurality of circles of grooves and at least one circle of semicircular sealing groove are evenly formed in the outer wall of the portion, wrapped by the front end of the insulating body, of the cylindrical part at intervals, the sealing groove is close to one side of the conical part, and an O-shaped sealing ring is arranged in the sealing groove. The fine sand layer and the semi-conductive adhesive layer are sprayed on the surface of the hardware fitting, and the groove and the sealing groove are formed, so that the sealing performance between the hardware fitting and the insulating body is improved, the effect is good, and the process is simple.

Description

Technical Field

[0001] The utility model relates to the field of cable accessories, in particular to an air leakage prevention sleeve with a sealing ring. Background Art

[0002] When connecting high-voltage cables, sleeves are required. Generally, a sleeve includes fittings, an insulating body, etc. The sealing performance between the fittings and the insulating body will affect the insulation performance. Chinese Patent CN210240536U discloses a sleeve. In this patent, a first wavy fitting surface is provided on the surface of the fittings, and a second wavy fitting surface that matches it is provided on the insulating body. At the same time, a right-angle sealing groove is provided between the first wavy fitting surface and the shielding ring, and a sealing ring is arranged in the sealing groove. This design can improve the sealing performance, but there are also certain defects. For example, the process of machining the wavy fitting surface on the surface of the fittings is difficult, and when the temperature rises or falls, the thermal expansion and contraction between the fittings and the insulating body are not synchronized, which will also cause delamination and air leakage between the fittings and the insulating body. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an air leakage prevention sleeve with a sealing ring.

[0004] The innovation point of the utility model lies in that: in this application, by spraying a fine sand layer, a semi-conductive glue layer on the surface of the fittings, and opening grooves and sealing grooves, on the one hand, the contact area between the fittings and the insulating body can be increased, and the firmness of the bond between the fittings and the insulating body can be increased. On the other hand, it can also prevent delamination and air leakage between the fittings and the insulating body caused by the asynchronous thermal expansion and contraction between the fittings and the insulating body. Finally, the sealing effect is further improved by using the thermal expansion and contraction principle of the O-ring.

[0005] To achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0006] An air leakage prevention sleeve with a sealing ring, including fittings and an insulating body. The fittings include a cylindrical part at the front end and a conical part at the rear end. The front end of the insulating body wraps the middle and rear parts of the cylindrical part and the entire conical part. The parts of the fittings wrapped by the insulating body are sprayed with a fine sand layer and a semi-conductive glue layer. A plurality of circles of grooves and at least one circle of semi-circular sealing grooves are evenly arranged at intervals on the outer wall of the part of the cylindrical part wrapped by the front end of the insulating body. The sealing groove is close to the conical part side, and an O-ring is arranged in the sealing groove.

[0007] Further, at least 5 circles of grooves are provided.

[0008] Further, the diameter of the sealing groove is smaller than the wire diameter of the O-ring.

[0009] Further, an exhaust groove is also arranged on the conical part of the fittings.

[0010] Further, the insulating body is made of epoxy resin.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. Spraying a fine sand layer on the contact surface between the fitting and the insulating body can increase the contact area between the fitting and the insulating body, spraying a semi-conductive adhesive layer can increase the bonding strength between the fitting and the insulating body, and reduce the possibility of air leakage.

[0013] 2. Spraying a semi-conductive adhesive on the contact surface between the fitting and the insulating body can also prevent delamination and air leakage between the fitting and the insulating body caused by the asynchronous thermal expansion and contraction of the fitting and the insulating body.

[0014] 3. In this application, grooves are evenly arranged at intervals on the surface of the cylindrical part of the fitting, which can increase the contact area between the fitting and the insulating body, reduce the possibility of air leakage, and the process of machining grooves on the surface of the fitting has low difficulty.

[0015] 4. In this application, a sealing groove is arranged on the surface of the cylindrical part of the fitting, and an O-ring is arranged in the sealing groove. The diameter of the sealing groove is smaller than the wire diameter of the O-ring. When the temperature of the fitting and the O-ring is relatively low, the two are assembled, and then the insulating body is quickly poured. Since the O-ring is assembled at a relatively low temperature, the insulating body is poured when its own size shrinks. During actual use, due to the heating of the cable, the temperature of the O-ring rises, and the O-ring is in an expanded state, which plays a role in strengthening the seal. Therefore, the sealing effect of this application is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2 is Figure 1 the enlarged view of part A in

[0018] In the figure: 10 is the fitting, 11 is the cylindrical part, 12 is the conical part, 13 is the groove, 14 is the sealing groove, 15 is the exhaust groove, 20 is the insulating body, and 30 is the O-ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings.

[0020] An airtight leakage-proof sleeve with a sealing ring, comprising a fitting 10 and an insulating body 20. The fitting 10 includes a cylindrical part 11 at the front end and a conical part 12 at the rear end. The front end of the insulating body 20 wraps around the middle and rear parts of the cylindrical part 11 and the entire conical part 12. The part of the fitting 10 wrapped by the insulating body 20 is sprayed with a fine sand layer and a semi-conductive adhesive layer. A plurality of grooves 13 and at least one circle of semi-circular sealing grooves 14 are evenly spaced on the outer wall of the part of the cylindrical part 11 wrapped by the front end of the insulating body 20. The sealing groove 14 is close to the conical part 12, and an O-ring 30 is arranged in the sealing groove 14.

[0021] Further, at least 5 circles of the grooves 13 are provided.

[0022] Further, arranging the grooves 13 can increase the contact area between the fitting 10 and the insulating body 20, reduce the possibility of air leakage, and machining the grooves 13 on the surface of the fitting 10 has a low process difficulty, and the grooves can be flexibly opened according to the length of the cylindrical part 11 and the wrapping length of the insulating body 20.

[0023] Further, spraying the fine sand layer changes from a smooth surface fit to a frosted surface fit, which can increase the contact area between the fitting 10 and the insulating body 20. Spraying the semi-conductive adhesive layer can increase the bonding strength between the fitting 10 and the insulating body 20, reduce the possibility of air leakage, and spraying the semi-conductive adhesive layer can also prevent delamination between the fitting 10 and the insulating body 20 caused by different thermal expansion and contraction rates of the fitting 10 and the insulating body 20, thus avoiding air leakage.

[0024] Further, the diameter of the sealing groove 14 is smaller than the wire diameter of the O-ring 30, and the O-ring 30 can better fill and fit the sealing groove 14.

[0025] Further, an O-ring 30 is arranged in the sealing groove 14, and the diameter of the sealing groove 14 is smaller than the wire diameter of the O-ring 30. When the fitting 10 and the O-ring 30 are assembled at a lower temperature, and then the insulating body 20 is quickly poured. Since the O-ring 30 is assembled at a lower temperature, when the insulating body 20 is poured with the O-ring 30 in a state of reduced self-size, during actual use, due to the heating of the cable, the temperature of the O-ring 30 rises, and the O-ring 30 is in an expanded state, playing a role in strengthening the seal. Therefore, the sealing effect of this application is good.

[0026] Further, an exhaust groove 15 is also arranged on the conical part 12 of the fitting 10. Arranging the exhaust groove 15 can exhaust air in time when pouring the insulating body 20, avoiding the generation of bubbles.

[0027] Further, the insulating body 20 is made of epoxy resin.

[0028] The described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

Claims

1. An anti-leakage sleeve with a sealing ring, comprising a hardware (10) and an insulating body (20), characterized in that: The hardware (10) comprises a cylindrical portion (11) at the front end and a conical portion (12) at the rear end, and the front end of the insulating body (20) wraps around the middle and rear part of the cylindrical portion (11) and the entire conical portion (12); the portion of the hardware (10) wrapped by the insulating body (20) is sprayed with a fine sand layer and a semi-conductive adhesive layer, and the outer wall of the portion of the cylindrical portion (11) wrapped by the front end of the insulating body (20) is evenly spaced to form a plurality of grooves (13) and at least one semicircular sealing groove (14), the sealing groove (14) is close to one side of the conical portion (12), and an O-type sealing ring (30) is provided in the sealing groove (14).

2. The anti-leakage sleeve with a sealing ring according to claim 1, characterized in that: The groove (13) is provided with at least 5 circles.

3. The anti-leakage sleeve with a sealing ring according to claim 1 or 2, characterized in that: The diameter of the sealing groove (14) is smaller than the wire diameter of the O-type sealing ring (30).

4. The anti-leakage sleeve with a sealing ring according to claim 1, characterized in that: The conical portion (12) of the hardware (10) is also provided with an exhaust groove (15).

5. The anti-leakage sleeve with a sealing ring according to claim 1, characterized in that: The insulating body (20) is epoxy resin.

Images