CN209841303U - SF6Insulator leakage detection device for ring main unit - Google Patents

Abstract

SF (sulfur hexafluoride)₆The insulator leakage detection device for the ring main unit comprises a support, wherein a horizontal metal plate is arranged on the support, a plurality of circular hollowed holes are formed in the horizontal metal plate, a cylindrical detection cup is welded to each circular hollowed hole correspondingly, and the top edge of the wall of each detection cup is tightly welded to the edge of each circular hollowed hole; the bottom of each detection cup is provided with small vent holes, and each small vent hole is correspondingly connected with a branch air pipe; the helium mass spectrometer leak detector is characterized by also comprising a main gas pipe, wherein one end of the main gas pipe is connected with the helium mass spectrometer leak detector, and the other end of the main gas pipe is communicated with each branch gas pipe; also is provided with an inverted metal cup cover, the metal cup cover is provided with an air inlet hole, the air inlet hole is connected with an inflation tube, and the inflation tube is communicated withThe overaadmission valve is connected to an ambient helium source. The utility model discloses can leak hunting before the insulator installation, just whole detection brings after avoiding the installation disadvantage, detection efficiency is high moreover, the detection precision is high.

Description

SF6Insulator leakage detection device for ring main unit

Technical Field

The utility model belongs to the technical field of electric elements detects, concretely relates to SF₆Insulator leak hunting device for looped netowrk cabinet.

Background

SF₆(sulfur hexafluoride) is an excellent gas insulation and arc extinguishing medium, and thus is used in ring main units. SF₆The ring main unit requires high sealing performance of various components, otherwise SF (sulfur hexafluoride) can be caused₆The gas pressure drops, reducing its electrical performance, and in addition, threatening the safe operation of the equipment, and causing environmental pollution. Thus, SF is ensured₆The air tightness of various components of the ring main unit is of great importance.

SF₆The ring main unit is provided with a large number of insulators as shown in fig. 1, the insulators include a metal core 81 and a non-metal casing 82, the non-metal casing 82 surrounds the metal core 81, wherein the non-metal casing 82 is axially divided into a casing head section 821, a casing middle section 822 and a casing tail section 823, the casing middle section 822 is further provided with a ring-shaped rib 824, an annular groove 80 is formed in the end face of the ring-shaped rib, and a sealing ring 9 is embedded in the annular groove 80.

However, since the metal core and the non-metal shell of the insulator are not integrally formed, there is a possibility that a gas leakage path may be formed at the interface between the metal core and the non-metal shell (as shown by the AB interface/CD interface in fig. 1). Conventional SF₆The leak hunting of part is not carried out in the time of insulator for the looped netowrk cabinet shipment, only waits to just carry out the leak hunting with whole platform gas tank together in the production later stage, nevertheless waits to just carry out the leak hunting in this stage and has following not enough: if the insulator is found to be leaked only at the stage, the back plate of the gas box must be ground off, the insulator is replaced again, the back plate is welded again and the leakage detection is carried out again, so that the loss is high, much time is wasted, and the delivery date of the product is influenced sometimes; secondly, because the whole gas box is large in volume, high vacuum degree is difficult to form, detection accuracy is not high, and if air leakage is not large, the gas box is too large in volume to be detected.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to overcome the above disadvantages and to provide an SF₆Insulator leakage detection device for ring main unit, which can be carried out before insulator installationAnd the leakage detection is realized, the defect caused by integral detection after installation is avoided, and the detection efficiency and the detection precision are high.

The purpose can be realized according to the following scheme: SF (sulfur hexafluoride)₆The insulator leakage detection device for the ring main unit is characterized by comprising a support, wherein a horizontal metal plate is arranged on the support, a plurality of circular hollowed holes are formed in the horizontal metal plate, a cylindrical detection cup is correspondingly welded in each circular hollowed hole, and the top edge of the cup wall of each detection cup is tightly welded with the edge of each circular hollowed hole; detecting the inner diameter and SF of the cup₆The diameters of the middle sections of the outer sleeves of the insulators for the ring main unit are the same; the bottom of each detection cup is provided with small vent holes, and each small vent hole is correspondingly connected with a branch air pipe; the helium mass spectrometer leak detector is characterized by also comprising a main gas pipe, wherein one end of the main gas pipe is connected with the helium mass spectrometer leak detector, and the other end of the main gas pipe is communicated with each branch gas pipe; the metal cup cover is also provided with an inverted metal cup cover, the metal cup cover is provided with an air inlet, the air inlet is connected with an inflation tube, and the inflation tube is connected to an external helium source through an air inlet valve.

The utility model has the advantages of it is following and effect:

one, the utility model discloses be suitable for and carry out the leak hunting to the insulator specially before the installation insulator, just whole detection brings after avoiding the installation disadvantage, detection efficiency is high moreover, once bleed a plurality of insulators of detectable.

Secondly, the utility model utilizes SF₆The insulator for the looped netowrk cabinet seals originally some sealing washers, utilizes atmospheric pressure to make this sealed effect form virtuous circle, detects the small and can form higher vacuum of cup inner chamber moreover, even trace gas leakage also can detect out, detects the precision height.

Thirdly, the operation and the use are convenient, and the maintenance is convenient.

Drawings

FIG. 1 is SF₆Schematic diagram of a section structure of an insulator for a ring main unit.

Fig. 2 is a schematic diagram of the overall structure of an embodiment of the present invention.

FIG. 3 is an enlarged schematic view of the metal cup of FIG. 2

Fig. 4 is an enlarged schematic view of a-a in fig. 2.

Fig. 5 is a schematic view of a usage status of an embodiment of the present invention.

Fig. 6 is a partially enlarged schematic view of fig. 5.

Detailed Description

FIG. 2, FIG. 3, and FIG. 4 show the SF₆The insulator leakage detecting device for the ring main unit comprises a support 1, wherein a horizontal stainless steel plate 2 is installed on the support 1, six circular hollowed holes 21 are formed in the horizontal stainless steel plate 2, the six circular hollowed holes 21 are arranged into two rows and three columns, each circular hollowed hole 21 is correspondingly welded with a cylindrical detection cup 3, and the top edge of the cup wall of each detection cup 3 is tightly welded with the edge of the corresponding circular hollowed hole 21; detect the inner diameter and SF of the cup 3₆The diameters of the middle sections of the outer sleeves of the insulators for the ring main unit are the same; the bottom of each detection cup 3 is provided with small vent holes 30, each small vent hole 30 is correspondingly connected with a branch air pipe 4, and the total number of the branch air pipes 4 is six; the helium mass spectrometer is also provided with a main gas pipe 5, one end of the main gas pipe 5 is connected with a helium mass spectrometer leak detector 6, and the other end of the main gas pipe 5 is communicated with the six branch gas pipes 4; an inverted metal cup cover 7 is further arranged in a matched mode, an air inlet hole 70 is formed in the metal cup cover 7, the air inlet hole 70 is connected with an air charging pipe 71, and the air charging pipe 71 is connected to an external helium source through an air inlet valve 72.

The working process of the embodiment is as follows:

six SF to be detected₆The insulators 8 for the ring main unit are respectively plugged into the six detection cups 3, as shown in fig. 5, SF₆The ring grooves 80 of the insulator 8 for the ring main unit are respectively embedded with a sealing ring 9, and SF filled in the ring main unit₆A sealing ring 9 of an insulator 8 for the ring main unit is initially contacted with the upper surface of the horizontal stainless steel plate 2; then, the helium mass spectrometer leak detector is started to vacuumize the six detection cups 3, and the detection cups 3 generate negative pressure, so that the atmospheric pressure presses the sealing rings 9 downwards through the insulators 8, and the sealing rings 9 cling to the upper surface of the horizontal stainless steel plate 2 to form good sealing, as shown in fig. 6, so that external gas is effectively prevented from entering the detection cups 3, false detection is prevented, and the detection accuracy is improved; then, the metal cup cover 7 is sleevedOpening an air inlet valve 72 outside the upper end section of one of the insulators 8, spraying helium gas into the inner cavity of the metal cup cover 7, wherein at the moment, if the interface between the metal core part and the non-metal outer sleeve of the insulator 8 leaks air, the helium gas enters the detection cup 3 of the leak detection device from a leakage channel inside the insulator under the action of negative pressure, and is finally sucked into the helium mass spectrometer leak detector through the branch air pipe 4 and the main air pipe 5; on the contrary, if the interface between the metal core part and the non-metal outer sleeve of the insulator 8 is sealed well, helium cannot enter the detection cup 3, and cannot be sucked into the helium mass spectrometer leak detector; therefore, the helium mass spectrometer leak detector can judge whether the insulator has leakage or not through the suction amount of the helium gas. After the detection of one insulator 8 is completed, the other insulators 8 can be detected in turn; under normal conditions, the quality of six insulators 8 can be detected by pumping once.

Finally, it should be noted that: the above-mentioned technical solutions of the present invention are only used for illustrating the technical solutions of the present invention and not for limiting the same, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (1)

1. SF (sulfur hexafluoride)₆The insulator leakage detection device for the ring main unit is characterized by comprising a support, wherein a horizontal metal plate is arranged on the support, a plurality of circular hollowed holes are formed in the horizontal metal plate, a cylindrical detection cup is correspondingly welded in each circular hollowed hole, and the top edge of the cup wall of each detection cup is tightly welded with the edge of each circular hollowed hole; detecting the inner diameter and SF of the cup₆The diameters of the middle sections of the outer sleeves of the insulators for the ring main unit are the same; the bottom of each detection cup is provided with small vent holes, and each small vent hole is correspondingly connected with a branch air pipe; the helium mass spectrometer leak detector is characterized by also comprising a main gas pipe, wherein one end of the main gas pipe is connected with the helium mass spectrometer leak detector, and the other end of the main gas pipe is communicated with each branch gas pipe; the metal cup cover is also provided with an inverted metal cup cover, the metal cup cover is provided with an air inlet, the air inlet is connected with an inflation tube, and the inflation tube is connected to the outside through an air inlet valveThe helium source of the boundary.