CN200953255Y - Encapsulation assembly type low-voltage electric penetration piece - Google Patents

Abstract

The utility model belongs to an electric penetration piece in the pressure vessel, concretely relates to embedment subassembly formula low pressure electric penetration piece. The method is characterized in that: the conductor assembly realizes the self sealing of a single conductor assembly through the curing encapsulation of the flame-retardant epoxy resin, and adopts the O-shaped rubber sealing ring to realize the sealing of a group of conductor assemblies and the cylinder assembly, so that the performance is reliable; the flame-retardant epoxy resin and the insulating sheath of the nuclear-grade cable are adopted as insulating materials, so that the electrical penetration piece has high electrical insulating property and long service life; the multi-section nuclear-grade cable and the compression joint are connected to serve as a conductor, so that the electrical continuity of the nuclear-grade cable is guaranteed, and a leakage channel formed between the cable insulation sheath and the cable core is cut off. The utility model discloses be used for on the reactor shielding structures specially, as low pressure power, control or instrument cable through-put.

Description

Potting component type low-voltage electrical penetration

technical field

The utility model belongs to an electrical penetrating piece in a pressure vessel, in particular to an electrical penetrating piece of a reactor containment vessel.

Background technique

The electrical penetration of the reactor containment is used as a channel for various cables to penetrate the containment. It must not only meet the relevant electrical performance requirements, but also ensure reliable sealing performance. Even under various accident conditions (including loss of water, earthquakes, etc.), The integrity and electrical continuity of the containment pressure boundary can still be maintained. At present, component-type electrical penetrations are widely used due to their strong versatility and easy replacement and maintenance. The Chinese patent with application number 200520107527.0 discloses a "reactor containment low-voltage electrical penetrating piece", which is simple in structure, reliable in performance, strong in versatility, and easy to disassemble. However, there are the following defects: 1. Since the conductor assembly adopts the connector structure, there are many transition joints in the assembly, and the continuity of the conductor is poor. At the same time, due to the different resistivity of the conductors of various materials, it is easy to cause local heating of the conductor material, which is not conducive to Realization of the overall function of electrical penetrations; 2. Conductor insulation is treated with polyimide film insulation coating and high-temperature sintering process, which is complicated in process and high in cost; 3. Sealed connector socket with sealing flange and "O" type metal The sealing ring is plugged with each conductor assembly, and the conductor assembly is fixed on the end plates on both sides, so as to realize the double channel sealing of the conductor assembly, but the processing technology of the connector is complicated and the assembly is difficult.

Contents of the invention

The purpose of the utility model is to develop a potting component low-voltage electrical penetrating piece with good electrical continuity, good insulation effect and good sealing performance.

The utility model is realized in the following way: a potting assembly type low-voltage electrical penetrating piece, which includes a cylinder body, two end plates, a pressure guide tube and a welding method for connecting with the embedded pipe, which are arranged in the embedded pipe The cylinder assembly composed of blue and blue is respectively connected to the junction box on the two end plates. The cylinder is connected to the pressure monitoring assembly composed of connecting pipe, instrument valve and pressure gauge through the pressure pipe, and the conductor assembly is installed in the cylinder. There are a plurality of corresponding holes on the two end plates of the cylinder, and a sealing sleeve is installed in the hole, and the conductor assembly includes a sealing seat sealed and installed in the sealing sleeve, and a protection screw connected with two ends of the sealing seat. The sleeve is welded together with the sealing seat to support the positioning partition of the conductor, a set of conductors passing through the positioning partition, a positioning connecting tube that is sleeved outside the conductor and threaded with the positioning partition, and a heat shrink sleeve that is placed outside the positioning connecting tube tubing, and a flame retardant epoxy potted between the conductors.

There are annular grooves distributed on the outer surface of the sealing seat, and an "O"-shaped sealing ring is arranged in the groove. The conductor is composed of multi-section nuclear-grade cables and crimped joints. The nuclear-grade cables include nuclear-grade cable cores. And nuclear-grade cable insulation sheath, with a ring-shaped polyethersulfone filler block at the outer end of the protective sleeve.

The effects of the utility model are as follows: 1. The conductor components are sealed by the flame-retardant epoxy resin curing potting to realize the sealing of a single conductor component itself, and the "O" type rubber sealing ring is used to realize the sealing of a group of conductor components and the cylinder component. Reliable performance; 2. Use flame-retardant epoxy resin and the insulating sheath of nuclear-grade cables as insulating materials, so that electrical penetrations have high electrical insulation performance and service life; 3. Use multi-section nuclear-grade cables and pressure Connectors are connected as conductors, which not only ensure the electrical continuity of nuclear-grade cables, but also cut off the leakage channel formed between the cable insulation sheath and the core; 4. The electrical penetration part has a spare installation hole for the conductor assembly, which can facilitate the expansion of the cable aisle.

Description of drawings

Fig. 1 is a structural schematic diagram of the potting assembly type low-voltage electrical penetration provided by the utility model;

Fig. 2 is an enlarged view of part I of Fig. 1 .

In the figure, 1 junction box, 3 instrument valve, 4 connecting pipe, 5 pressure gauge, 6 pressure introduction pipe, 7 barrel, 8 welding flange, 9 compression bolt and nut, 10 conductor assembly, 11 conductor, 12 end plate, 13 end plate, 14 fastening bolt and nut, 15 blind plate, 16 sealing sleeve, 17 fastening pressure block, 18 sealing seat, 19 epoxy resin potting body, 20 heat shrinkable tube, 21 positioning connection, 22 positioning partition , 23 "O" type rubber ring, 24 protective sleeve, 25 polyethersulfone filler block, 26 nuclear grade cable, 27 nuclear grade cable insulation sheath, 28 nuclear grade cable core, 29 crimp joint

Detailed ways

As shown in Figures 1 and 2, the utility model includes a cylinder body 7, end plates 12 and 13, multiple sets of sealing sleeves 16, welding flanges 8 and pressure induction pipes 6 connected to pressure monitoring components. A closed pressure-bearing container composed of the barrel assembly and the conductor assembly 10 arranged in the barrel assembly, that is, the penetration body, is detachably connected. Rubber gaskets are provided between the junction box 1 and the end plates 12 and 13, and are connected by compression bolts and nuts 9. The junction box 1 fixes and protects cables, and has protective functions such as dustproof and moistureproof. The penetration piece body is welded to the pre-buried pipe on the reactor containment through the welding flange 8, and a certain pressure of nitrogen is filled through the external gas source. The working pressure must be greater than the maximum pressure under the reactor operation and accident conditions, thus forming a reactor A pressure barrier in the shield wall to prevent the leakage of reactor fission products.

The pressure monitoring assembly includes a pressure gauge 5 , an instrument valve 3 and a connecting pipe 4 , and is connected to the cylinder 7 through a pressure introduction pipe 6 welded on the cylinder 7 . The pressure gauge 5 adopts an electric contact pressure gauge, and the pressure signal can be sent to the central control room. The main function of the pressure monitoring component is to continuously monitor the internal air pressure of the penetration body on site and remotely, and supply air to the penetration when the pressure drops to the limit value.

There are multiple conductor assemblies 10, which are arranged in the sealing sleeve 16 of the barrel assembly. Through the entire barrel assembly, each conductor assembly 10 is composed of a conductor 11, a protective sleeve 24, a sealing seat 18, a positioning partition 22, a positioning joint 21, a heat shrinkable tube 20 and a polyethersulfone filling block 25. The space on both sides of the conductor assembly 10 formed by the above-mentioned components is filled with epoxy resin 19, and the temperature is raised in stages and continuously cured at a constant temperature to realize the sealing of the conductor assembly. The conductor 11 is composed of a nuclear grade cable 26 , or multiple pieces of nuclear grade cables 26 connected with crimping joints 29 . The nuclear-grade cable core 28 is used as a cut-off core, and is crimped and fixed with the crimping joint 29, which not only ensures the continuity of the conductor 11, but also cuts off the leakage formed between the nuclear-grade cable insulation sheath 27 and the nuclear-grade cable core 28 aisle. There are two positioning partitions 22 , which are respectively welded and fixed to the sealing seat 18 and screwed to the positioning connecting pipe 21 to jointly realize the radial position fixation of the conductor 11 . The protective sleeve 24 is screwed to both ends of the sealing seat 18 , and the annular polyethersulfone packing block 25 is arranged at both ends of the protective sleeve 24 . The conductor 11 is connected to the positioning connection tube 21 by using a heat shrinkable tube 20 to fix the axial position of the conductor 11 . There are multiple annular grooves on the inner surfaces of the sealing seat 18 and the protective sleeve 24 , and the outer surface of the protective sleeve 24 is pressed inward into annular grooves of a certain depth to compensate for the curing shrinkage deformation of the epoxy resin. The conductor assembly 10 is fixed on the end plate 12 by a fastening block 17 and a fastening bolt and nut 14 . The sealing between the conductor assembly 10 and the sealing sleeve 16 is realized by four “O”-shaped rubber rings 23 . A conductor assembly 10 and a spare installation hole are left on the barrel assembly, which can be blocked by a blind plate 15 .

The utility model is specially used on the shielding structure of the reactor as a penetrating part of the low-voltage power, control or instrument cables.

Claims (3)

1. A potting component type low-voltage electrical penetration, which includes a cylinder (7), two end plates (12) and (13), a pressure introduction tube (6) and a The cylinder assembly composed of the welding flange (8) connected by the embedded pipe is connected to the junction box (1) on the two end plates (12) and (13) respectively, and the cylinder (7) passes through the pressure pipe (6) It is connected with a pressure monitoring assembly composed of a connecting pipe (4), an instrument valve (3) and a pressure gauge (5), and a conductor assembly (10) is installed in the cylinder (7), which is characterized in that: the cylinder There are a plurality of corresponding holes on the two end plates (12) and (13), and a sealing sleeve (16) is installed in the hole, and the said conductor assembly (10) includes a sealing seat installed in the sealing sleeve (16) (18), the protective sleeve (24) that is threadedly connected to both ends of the sealing seat (18), is welded together with the sealing seat (18) to support the positioning partition (22) of the conductor, and runs through the positioning partition (22) A group of conductors (11), the positioning adapter (21) that is sleeved outside the conductor (11) and threaded with the positioning partition (22), the heat shrinkable tube (20) that is sleeved outside the positioning adapter (21), and the Flame-retardant epoxy resin (19) potted between the conductors (11). 2. A potting assembly type low-voltage electrical penetration according to claim 1, characterized in that: an annular groove is distributed on the outer surface of the sealing seat (18), and an "O"-shaped sealing ring is arranged in the groove , said conductor (11) is composed of multi-section nuclear grade cables (26) and crimp joints (29), and nuclear grade cables (26) include nuclear grade cable cores (28) and nuclear grade cable insulation sheaths ( 27), the outer end of the protective sleeve (24) is provided with an annular polyethersulfone filler block (25). 3. A potting component-type low-voltage electrical penetration according to claim 1 or 2, characterized in that: a spare installation hole for the conductor assembly (10) is provided in the barrel (7), and the hole is formed by a blind plate (15) Blockage.

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