CN202736726U - Sulfur hexafluoride current transformer - Google Patents

Abstract

The utility model relates to a sulfur hexafluoride current transformer, which comprises an outer cylinder body and end flanges assembled at both ends of the outer cylinder body, a primary conductor and an end flange that axially pass through the outer cylinder body and through the two end flanges. A sealing fit structure is provided between the end flanges, and the seal fit structure includes a seal assembly and a seal assembly installation hole arranged on the end flange, and the inside of the seal assembly installation hole is provided with an axial limit for the seal assembly. The stop edge, the sealing assembly includes an inner pressure ring, at least one V-shaped sealing ring and an outer pressure ring, which are sequentially sleeved on the primary conductor from the inside to the outside, and the end faces of the inner pressure ring and the outer pressure ring are press-fitted with the V-shaped sealing ring Corresponding V-shaped protrusions and V-shaped grooves are respectively provided on the top, and the sealing assembly is pressed into the mounting hole of the sealing assembly by the compression flange fixed on the end flange, and pressed against the stop along. The utility model forms a good seal between the primary conductor and the end flange.

Description

Sulfur Hexafluoride Current Transformer

technical field

The utility model relates to a sulfur hexafluoride current transformer.

Background technique

Sulfur hexafluoride current transformer is an important metering and protection equipment in the power system. The existing sulfur hexafluoride current transformer includes an outer cylinder and end flanges arranged at both ends of the outer cylinder. The primary conductor runs along the outer cylinder. The axis passes through the outer cylinder, and its two ends respectively pass through the corresponding end flanges. Since the outer cylinder is filled with sulfur hexafluoride gas at a certain pressure, a gas seal is required between the primary conductor and the end flanges. However, since the position of the primary conductor needs to be adjusted according to the actual situation during the installation process, it is easy to cause the position of the O-ring to move, thereby affecting the sealing performance and failing to achieve the ideal Sealing effect, in addition, this sealing structure is inconvenient to assemble in this product, and it is easy to cause air leakage.

Utility model content

The purpose of the utility model is to provide a sulfur hexafluoride current transformer with excellent sealing performance between the primary conductor and the end flange.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the sulfur hexafluoride current transformer includes an outer cylinder and end flanges assembled at both ends of the outer cylinder, axially passes through the outer cylinder and runs through the two ends A sealing fit structure is provided between the primary conductor of the flange and the end flange, and the seal fit structure includes a seal assembly and a seal assembly mounting hole arranged on the end flange. The stop edge of the axial limit of the seal assembly, the seal assembly includes an inner pressure ring, at least one V-shaped sealing ring and an outer pressure ring, which are sleeved on the primary conductor from the inside to the outside, and the inner pressure ring and the outer pressure ring are connected to the V-shaped There are corresponding V-shaped protrusions and V-shaped grooves on the end face of the sealing ring, and the sealing assembly is pressed into the mounting hole of the sealing assembly by the compression flange fixed on the end flange, and pressed Tightly on the said stop edge.

The V-shaped opening of the V-shaped sealing ring faces the inside of the outer cylinder, the inner pressure ring has a V-shaped protrusion, and the outer pressure ring has a V-shaped groove.

The V-shaped included angle of the V-shaped sealing ring is 90°, and the included angle between the V-shaped protrusion and the V-shaped groove on the inner pressure ring and the outer pressure ring is 105°.

The mounting hole of the sealing assembly on the end flange is a stepped hole with a small inside and a large outside, and the stepped surface of the stepped hole forms the stop edge; the outer ring surface of the inner pressure ring is for matching with the end flange. The stepped ring surface of the inner pressure ring is inserted into the small diameter hole section of the installation hole of the sealing assembly.

A shaft shoulder is provided on the part of the outer end of the outer pressure ring protruding from the end flange, and the compression flange is sleeved on the outer pressure ring to push the sealing assembly through the shaft shoulder.

A sealing ring is provided between the compression flange and the outer pressure ring, and a gasket is provided between the compression flange and the end flange.

The primary conductor and the end flange of the utility model are sealed by means of a sealing assembly. A V-shaped sealing ring is used in the sealing assembly. The sealing assembly is compressed by pressing the flange, and the V-shaped sealing ring is opened after being pressed. In this way, a good seal is formed between the primary conductor and the end flange; in addition, when assembling, first install the inner pressure ring on the primary conductor, then install the V-shaped sealing ring and the outer pressure ring in turn, and finally use the compression flange to complete the sealing process. The installation of the sealing structure is completed by fastening and pressing, and the assembly process is simple.

In the utility model, the V-shaped opening of the V-shaped sealing ring is set towards the outer cylinder body, which can effectively prevent gas leakage and enhance the sealing effect. The 105° V-shaped included angle on the inner pressure ring and the outer pressure ring cooperates with the 90° included angle of the V-shaped sealing ring to ensure good sealing contact between the three after compression.

Description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is the partial enlarged view of I-I place in Fig. 1;

Fig. 3 is a schematic structural view of the V-shaped sealing ring in Fig. 1;

Fig. 4 is a schematic structural view of the internal pressure ring in Fig. 1;

Fig. 5 is a schematic structural view of the outer pressure ring in Fig. 1 .

Detailed ways

The sulfur hexafluoride current transformer shown in Figures 1-5 is an embodiment provided by the utility model, which includes an outer cylinder 1 and end flanges 4 assembled at both ends of the outer cylinder, axially passing through the outer There is a sealing fit structure between the primary conductor 2 and the end flange 4 of the cylinder body and through the two end flanges. The seal fit structure includes a seal assembly and a seal assembly installation hole arranged on the end flange. The installation hole is a stepped hole with a small inside and a large outside. The stepped surface of the stepped hole is close to the inner side of the end flange, and the stepped surface forms a stop edge 9 for axially limiting the sealing assembly.

The sealing assembly includes an inner pressure ring 5 , three V-shaped sealing rings 6 and an outer pressure ring 7 which are sheathed on the primary conductor in sequence from inside to outside. The outer ring surface of the inner pressure ring is a stepped ring surface matched with the end flange, and the reduced-diameter section 10 of the inner pressure ring 5 is inserted into the small-diameter hole section of the installation hole of the sealing assembly. The V-shaped included angle of the V-shaped sealing ring 6 is 90°, and its V-shaped opening is set toward the inside of the outer cylinder body 1. The end face matched with the V-shaped sealing ring is a V-shaped groove, and the angle between the V-shaped protrusion and the V-shaped groove is 105°. The outward end of the outer pressure ring 7 protrudes from the end flange 4, and the protruding part is provided with a shaft shoulder 11, and the compression flange 8 sleeved on the outer pressure ring is fixedly connected to the end flange, and The seal assembly is pushed into the installation hole of the seal assembly through the shoulder on the outer pressure ring, and the seal assembly is pressed against the stop edge. By pressing, the V-shaped seal ring is opened, and the primary conductor 2 and the end A seal is formed between the flanges 4 .

In other embodiments of the present utility model, the number of V-shaped sealing rings can be set according to actual needs, and the opening direction of the V-shaped sealing rings can also be set outwards. At this time, the inner pressure ring has a V-shaped groove , The outer pressure ring is a V-shaped protrusion. The mounting hole of the sealing assembly can also be a light hole, and the ring surface of the internal pressure ring is an equal-diameter ring surface. At this time, the retaining ring for the hole can be used for axial stop and limit. The axial pushing between the compression flange and the outer pressure ring can also be realized by using other relatively common structures, as long as the pushing can be realized. In addition, in order to have a better sealing effect, a sealing ring can also be provided between the compression flange and the outer pressure ring, and a sealing gasket can be provided between the compression flange and the end flange. the

Claims (6)

1. sulfur hexafluoride current mutual inductor, comprise outer cylinder body and the end flange that is assemblied in the outer cylinder body two ends, axially pass outer cylinder body and run through the Primary Conductor of two end flange and end flange between be provided with the structure that is sealed and matched, it is characterized in that: the described structure that is sealed and matched comprises black box and the black box installing hole that is arranged on the end flange, the inboard of black box installing hole is provided with for the block edge to the black box axial limiting, black box comprises the inner pressure ring that is set in successively from inside to outside on the Primary Conductor, at least one V-shaped seal ring and outer press ring, be respectively equipped with corresponding V-arrangement projection and v-depression on the end face of inner pressure ring and outer press ring and V-shaped seal ring compression fit, black box is fitted in the black box installing hole by the supported flange that is connected on the end flange, and be pressed on described block along upper.

2. sulfur hexafluoride current mutual inductor according to claim 1, it is characterized in that: the V-type opening of described V-shaped seal ring is inner barrel outward, is the V-arrangement projection on the inner pressure ring, is v-depression on the outer press ring.

3. sulfur hexafluoride current mutual inductor according to claim 1 and 2, it is characterized in that: the V-arrangement angle of described V-shaped seal ring is 90 °, the V-arrangement projection on inner pressure ring and the outer press ring and the angle of V-type groove are 105 °.

4. sulfur hexafluoride current mutual inductor according to claim 1 and 2, it is characterized in that: the black box installing hole on the described end flange is inner small and outside big shoulder hole, the step surface of shoulder hole forms described block edge; The outer ring surface of described inner pressure ring is the step anchor ring that cooperates with end flange, in the diameter holes section of the undergauge section insert-seal assembly installing hole of inner pressure ring.

5. sulfur hexafluoride current mutual inductor according to claim 1 and 2, it is characterized in that: the part that an end outwardly of described outer press ring stretches out end flange is provided with the shaft shoulder, and described supported flange is sleeved on the outer press ring by shaft shoulder pushing black box.

6. sulfur hexafluoride current mutual inductor according to claim 5 is characterized in that: be provided with sealing ring between described supported flange and the outer press ring, be provided with sealing gasket between supported flange and the end flange.

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