RU2767047C1 - Localizing security gateway of nuclear plant with levered door locking mechanism - Google Patents

Abstract

FIELD: mechanical engineering.SUBSTANCE: invention relates to the field of mechanical engineering, namely to nuclear energy, in particular to equipment installed in the containment shells of nuclear reactors of an operating nuclear power plant and providing access for personnel to the hermetic enclosure of the reactor plant. The gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors includes a body and doors. The door is locked using a lever mechanism consisting of a rocking lever with rollers. The rollers are rolled onto the supporting inclined surface of the door bracket, which has the possibility of locking the door when the roller passes through the projection of the axis of the rocking lever onto the supporting surface of the door bracket. In addition, the withdrawal of the roller from the locked position is possible forcibly by an individual drive of the rocker mechanism.EFFECT: invention allows to increase the reliability and safety of work.3 cl, 2 dwg

Description

The invention relates to the field of mechanical engineering, namely to nuclear power, in particular to equipment installed in containments of nuclear reactors, operating nuclear power plant, and providing access to personnel in the hermetic enclosure of the reactor plant.

The Main Gateway (Gateway) is an element of the hermetic enclosure of the reactor building and is part of the localizing safety system (LSS) of a nuclear power plant (NPP). The gateway is designed to provide:

- passage of service personnel during operation of the unit;

- transportation of small-sized cargoes to the reactor plant maintenance mark during equipment repairs, nuclear fuel refueling and during unit operation;

- design degree of tightness of the zone of localization of the accident;

- containment, within the zone of localization of the accident, released radioactive substances.

Known Gateway for explosion-proof shells of a nuclear reactor (patent No. 2348995 dated 07/02/2007, G21F 7/005, F16K 3/02, F16K 31/524, publ. 03/10/2009), containing mounted in the housing, at least , two swing doors. Each leaf is equipped with an opening and closing mechanism, a locking wedge device and a gearbox. The locking wedge device is made in the form of a cam. The cam is mounted on the gearbox shaft and interacts with the rollers by wedge surfaces. The rollers are movably placed in the holder. The latter is fixed in the trunnion of the frame. The frame interacts with the sash with ball bearings and is mounted on swivel hinges. The lower of the loops is made driven. The mechanism for opening and closing the sash is made in the form of a system of levers, shafts and rods. The system is connected at one end to the distribution mechanism, and at the other end to the drive loop of the frame. Thanks to the design features of the locking wedge device and the associated system of levers, shafts and rods for opening and closing the leaves, uniform sealing of the gateway is ensured, regardless of the geometric shape of the door and opening.

However, the above-mentioned Gateway refers to the locking mechanisms of the backup (emergency) Gateway, which uses a cam mechanism rotated through the wall by a mechanical drive located in the housing, which complicates the drive and requires additional devices that ensure and control the tightness of the Gateway in the places where transmissions pass through the walls of the housing.

A Gateway is known, containing a body, in the end walls of which openings are made for the passage of personnel (https://www.tyazhmash.com/products/atomic/main-gateway/). A sealant is fixed along the perimeter of the openings. Each opening is equipped with a sealed door with clamping mechanisms, made in the form of a cam mechanism with an inclined pressing surface, which moves along the door roller. The rotation of the cams of the door pressing mechanisms is carried out by a mechanical drive with distributing mechanisms that provide sequential opening of the doors so that at least one door is closed, thereby ensuring the tightness of the localizing security system of the hermetic enclosure. The disadvantage of the above gateway is that one drive and distribution mechanisms are used to drive the door clamping mechanisms. The transmission of rotation is carried out through penetrations in the walls of the Sluice body. This complicates the drive and requires additional devices that ensure and control the tightness of the Airlock in the places where transmissions pass through the housing walls.

The objective of the proposed proposal is to create a reliable device, more simple in technical design, eliminating the need to transfer motion through the walls of the housing.

The technical result of using the proposed design of the gateway is to reduce the cost of manufacturing, operation, maintenance, as well as increase the reliability and safety of work.

This task is achieved due to the fact that the Gateway of the localizing safety system of a nuclear power plant is proposed with a lever mechanism for locking doors pressed against the openings of the body using lever mechanisms driven by individual drives, for example, hydraulic or electromechanical. Pressing and locking the door is carried out by a rocking lever with rollers rolling on the supporting inclined surface of the door bracket.

The withdrawal of the roller from the locked position is possible forcibly by an individual drive of the rocking lever mechanism. To confirm the sealing of the door, a double-circuit seal is used. The design of the Gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors is illustrated by drawings. In FIG. 1 shows the Lock of the localizing security system of a nuclear power plant with a lever mechanism for locking doors;

In FIG. 2 shows the lever mechanism for locking the doors of the Gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking the doors.

The lock of the localizing security system of a nuclear power plant with a lever mechanism for locking doors contains a cylindrical body 1, two doors 2, pressed against the end walls of the body by lever mechanisms 3. The lever mechanism consists of a bracket 4, a rocking lever 5 with rollers 7. The rocking lever is rotated by an individual drive 6. On The door bracket has an inclined surface with a transitional edge coinciding with the projection of the swing arm axis. To confirm the tightness of the door, a double-circuit seal 9 is used.

The gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors operates as follows. The lock of the localizing safety system of a nuclear power plant with a lever mechanism for locking the doors contains a cylindrical body 1, two doors 2, pressed against the end walls of the body by lever mechanisms 3. The door 2 is locked when the roller 7 passes through the projection of the axis of the rocking lever 5 onto the supporting surface of the bracket 4 of the door 2. On the bracket 4 of the door 2 there is an inclined surface with a transitional edge coinciding with the projection of the axis of the rocker arm 5. The rocker arm 5 is rotated by an individual drive 6. The output of the roller 7 from the locked position is possible forcibly by the individual drive 6 of the rocker arm mechanism 5. To confirm the sealing of the door 2 is used double seal 9.

Thus, due to the peculiarities of the execution of the lever mechanism for locking the doors of the proposed lock, its technical simplicity and reliability are ensured, eliminating the need to transmit movement through the housing wall.

Claims (3)

1. Gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors, including a body and doors pressed against the opening of the body by lever mechanisms driven by drives, characterized in that the door is locked using a lever mechanism consisting of a rocking lever with rollers , is carried out by rollers rolling onto the supporting inclined surface of the door bracket, which has the ability to lock the door when the roller passes through the projection of the axis of the rocking lever onto the supporting surface of the door bracket. 2. Gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors according to claim 1, characterized in that the release of the roller from the locked position is possible forcibly by an individual drive of the rocking lever mechanism. 3. Gateway of the localizing security system of a nuclear power plant with a lever mechanism for locking doors according to claim 1, characterized in that the lever mechanisms are actuated by individual drives.

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