CN2809399Y

CN2809399Y - Insulating joint

Info

Publication number: CN2809399Y
Application number: CN 200520078371
Authority: CN
Inventors: 杨锡久; 曾华
Original assignee: SHANXI QINFENG AVIATION HYDRAULIC XI'AN POOL FACTORY
Current assignee: SHANXI QINFENG AVIATION HYDRAULIC XI'AN POOL FACTORY
Priority date: 2005-02-21
Filing date: 2005-02-21
Publication date: 2006-08-23
Anticipated expiration: 2015-02-21

Abstract

The utility model discloses an insulating joint, which comprises an outer sleeve, an inner connecting pipe and an outer connecting pipe, wherein an external waterproof sealing ring, an insulating support ring and an insulating pressure ring are arranged between the inner surface of the outer sleeve and the outer surface of the inner connecting pipe. Two internal primary sealing rings are respectively arranged among the insulating pressure ring, the inner connecting pipe and the outer connecting pipe and, and an internal secondary sealing ring is arranged between the inner surface of the outer sleeve and the outer connecting pipe. An electric discharge cavity is formed between the inner surface of the outer sleeve and the outer surface of the inner connecting pipe and between the insulating support ring and the insulating pressure ring. Electric discharging columns are distributed on a big outer circle of the inner connecting pipe. The insulating joint of the utility model has the advantages of long service life, high insulating performance and safety.

Description

Insulating joint

Technical field

The utility model relates to a kind of steel pipe insulating joint, particularly relates to a kind of insulating joint with high-pressure discharging device.

Background technique

Along with the development that urban modernization is built, city underground steel pipeline increases rapidly.Because these pipelines are subjected to the strong corrosion of outside soil and interior media for a long time and corrosion leakage accident often take place, especially the electrochemical corrosion that pipeline is caused of the stray electrical current in the soil, shorten the working life of pipeline greatly, had a strong impact on the safe operation work of pipeline.In order effectively to avoid steel pipe to send out security incident, prolong its working life, the most effective way is that pipeline is taked cathode protection measure.

The model utility content

The purpose of this utility model is at above-mentioned the deficiencies in the prior art, and a kind of long service life, insulating property height and safe and reliable insulating joint are provided.

For achieving the above object, the technological scheme that the utility model adopted is: a kind of insulating joint, comprise overcoat 3, inner connection tube 6 and outer connecting pipe 10, be provided with outside waterproof grommet 1 between overcoat 3 internal surfaces and inner connection tube 6 outer surfaces, insulation supporter ring 2 and insulation pressure ring 7, insulation pressure ring 7 and inner connection tube 6, be respectively equipped with two inner once sealing circles 8 between the outer connecting pipe 10, be provided with inner secondary seal circle 9 between overcoat 3 internal surfaces and the outer connecting pipe 10, it is characterized in that: form a discharge cavity 5 jointly between described overcoat 3 internal surfaces and inner connection tube 6 outer surfaces and between insulation supporter ring 2 and the insulation pressure ring 7, on the big cylindrical of inner connection tube 6, be distributed with discharge column 4.

The advantage of the utility model insulating joint is: the utility model utilization is the even copper discharge column that distributes on the cylindrical of inner connection tube; by adjusting the distance of copper discharge column and overcoat internal surface; reach inner connection tube and overcoat and the outer connecting pipe mutually insulated under assigned voltage; under the situation of overshoot voltage or thunderbolt; discharge cavity by the internal surface of the tip of copper discharge column and overcoat forms electrical discharge arc, is not damaged by electric current to protect other insulating part.

Description of drawings

Fig. 1 is a sectional drawing of the present utility model.

Fig. 2 is the I enlarged view of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

Insulating joint as shown in Figure 1, comprise overcoat 3, inner connection tube 6 and outer connecting pipe 10, be provided with outside waterproof grommet 1 between overcoat 3 internal surfaces and inner connection tube 6 outer surfaces, insulation supporter ring 2 and insulation pressure ring 7, insulation pressure ring 7 and inner connection tube 6, be respectively equipped with two inner once sealing circles 8 between the outer connecting pipe 10, be provided with inner secondary seal circle 9 between overcoat 3 internal surfaces and the outer connecting pipe 10, form a discharge cavity 5 jointly between described overcoat 3 internal surfaces and inner connection tube 6 outer surfaces and between insulation supporter ring 2 and the insulation pressure ring 7, on the big cylindrical of inner connection tube 6, be distributed with discharge column 4.As shown in Figure 2; 2～8 copper discharge columns 4 evenly distribute on the cylindrical of inner connection tube 6; distance H between described discharge column 4 tops and overcoat 3 internal surfaces is 2mm～4mm; look required discharge intensity; adjust the distance H of copper discharge column 4 and overcoat 3 internal surfaces; reach inner connection tube 6 and overcoat 3 and the mutually insulated of outer connecting pipe 10 under assigned voltage; under the situation of overshoot voltage or thunderbolt; discharge cavity by the internal surface of the tip of copper discharge column 4 and overcoat 3 forms electrical discharge arc, is not damaged by electric current to protect other insulating part.

Claims

1, a kind of insulating joint, comprise overcoat (3), inner connection tube (6) and outer connecting pipe (10), be provided with outside waterproof grommet (1) between overcoat (3) internal surface and inner connection tube (6) outer surface, insulation supporter ring (2) and insulation pressure ring (7), insulation pressure ring (7) and inner connection tube (6), be respectively equipped with two inner once sealing circles (8) between the outer connecting pipe (10), be provided with inner secondary seal circle (9) between overcoat (3) internal surface and the outer connecting pipe (10), it is characterized in that: form a discharge cavity (5) jointly between described overcoat (3) internal surface and inner connection tube (6) outer surface and between insulation supporter ring (2) and the insulation pressure ring (7), on the big cylindrical of inner connection tube (6), be distributed with discharge column (4).

2, insulating joint according to claim 1 is characterized in that: described discharge column (4) is 2～8 copper discharge columns, is evenly distributed on the big cylindrical of inner connection tube (6).

3, insulating joint according to claim 1 and 2 is characterized in that: the distance between described discharge column (4) top and overcoat (3) internal surface is 2mm～4mm.