RU200607U1 - RETRACTOR BASE FOR RETRACTABLE CIRCUIT BREAKERS - Google Patents

Abstract

The utility model relates to electrical engineering, namely to the design of a withdrawable base for withdrawable circuit breakers. The technical result consists in increasing the reliability of the structure by simplifying the design of the movable part, which makes it possible to securely fix the circuit breaker in the movable part and increases the convenience of removing the circuit breaker from the withdrawable base. A withdrawable base for withdrawable circuit breakers comprises a stationary part and a movable part made with the possibility of interacting with the stationary part. At the same time, the withdrawable base provides three positions of the circuit breaker: "connected", "withdrawn" and "removed". The movable part consists of two panels of the movable part, interconnected by rods that form handles, by means of a threaded connection. In this case, the circuit breaker is clamped between the panels of the moving part and fixed by the corners made on the panels of the moving part. On each panel of the moving part, two guide axes are rigidly fixed. The fixed part consists of a base for connecting the contacts of the circuit breaker with the power busbars, and two panels of the fixed part connected to the base. Panels of the stationary part contain a guide cut, along which the guide axes of the panels of the movable part move. Each of the panels of the stationary part includes a pivotable lever. Each lever has a cutout, into which, when the lever is turned, the guiding axis of the panel of the movable part enters. 7 p.p. f-ly, 9 ill.

Description

Technology area

The utility model relates to the design of a withdrawable base for withdrawable circuit breakers.

State of the art

Retractable chassis for electrical devices, in particular for circuit breakers, are known from the prior art.

The source of information RU 179394U1 (Closed Joint Stock Company "Cheboksary Electrical Apparatus Plant", 05/14/2018) discloses a withdrawable device for a circuit breaker, which contains a screw mechanism with a carriage for racking in and out of the circuit breaker, roller guides, a self-rolling lock mechanism, a mechanical position indicator and electrical switch position sensors. This withdrawable circuit breaker device has a complex structure, and the movement of the circuit breaker by means of a screw mechanism makes it difficult to withdraw and retract.

The source of information RU 174929 U1 (Joint Stock Company "Kursk Electrical Apparatus Plant", 11/13/2017) discloses a device for moving and fixing a withdrawable circuit breaker containing a fixed part, which is a base, a movable part - a circuit breaker, consisting of two rails fixed on the switch body gear transmission with guides with racks included in them. One handle is attached to each stand, with the help of which the switch is moved from the operating position to the control one and vice versa, as well as to the position from which you can start removing the switch or install it on the base. In the known device, the switch is moved by means of gear racks with guides, which also complicates the process of moving the switch relative to the housing.

As a prototype, the source of information EP0620625 B1, (SCHNEIDER ELECTRIC SA, 08/26/1998), in which a sliding frame for a circuit breaker is disclosed, and the circuit breaker can be three-pole or four-pole, is adopted. In this case, the sliding frame is connected to the base plate and includes two fixed flanges attached to this base plate and two movable flanges attached to two opposite side walls of the switch by means of fixing means. Each of the movable flanges carries two drive shafts, respectively, meshed in two guide grooves of the fixed flanges. Each fixed flange is provided with a working arm, equipped with a handle and rotating around the fixed spindle. Moreover, the specified working lever contains a recess, the edges of which form two guide ramps for the drive spindle included in the specified recess. The locking device will allow the operating lever to be locked in a position corresponding to one or the other of said first and second positions of the circuit breaker. The drive shafts can slide in the guide grooves under the action of the ramps formed in the operating levers. The circuit breaker can be in the first connection position on the backplane connection board or the second disconnected position. Each of the shafts carries a free wheel bearing ring and two fixed pins located on each side of the bearing ring. In this case, the sliding frame provides three possible positions: "connected", "withdrawn" and "removed". The specified pull-out frame can be adapted to different types of circuit breakers by means of two movable flanges attached to two opposite side walls of the circuit breaker. However, the movable flanges are fastened by means of stud fastenings, with each flange attached to the corresponding side of the switch, which reduces the reliability of the switch fixing and reduces the rigidity of the withdrawable part as a whole.

The objective of the claimed utility model is to create a reliable and simple design of a withdrawable base for withdrawable circuit breakers, which ensures reliable fixation of the circuit breaker in the moving part.

Disclosure of the essence of the utility model

The technical result of the claimed utility model is to increase the reliability of the design of the withdrawable base for withdrawable circuit breakers by simplifying the design of the moving part, which allows the circuit breaker to be securely fixed in the moving part and increases the convenience of removing the breaker from the withdrawable base.

The technical result is achieved by the fact that the movable part of the roll-out base consists of two panels of the movable part, interconnected by rods that form handles, using a threaded connection, while the circuit breaker is clamped between the panels of the movable part and fixed by the corners made on the panels of the movable part , and on each panel of the movable part two guide axes are rigidly fixed. The movable part is made with the possibility of interaction with the stationary part, providing three positions of the circuit breaker: "connected", "withdrawn" and "removed".

In this case, the withdrawable base for withdrawable circuit breakers contains a fixed part, which consists of a base intended for connecting the contacts of the circuit breaker with power buses, and two panels of the fixed part connected to the base. Panels of the stationary part contain a guide cut, along which the guide axes of the panels of the movable part move. Each of the panels of the stationary part contains a lever that can be rotated, each lever has a cutout into which, when the lever is turned, the guiding axis of the panel of the movable part enters.

The steering axles are fixed to the panel of the moving part by means of a screw connection, which uses a countersunk screw and a vibration-resistant lock for bolts and screws. In this case, the guide axes of the movable part are made by turning and milling. They serve to move along the guide cut of the panel of the stationary part and to interact with the lever.

Auxiliary contacts are installed on the panels of the stationary part, which serve to indicate the position of the circuit breaker, and on the panels of the moving part, guides are fixed for the operation of the contacts for signaling the position of the circuit breaker in the withdrawable base. In this case, the guides are made of metal and are fixed with a screw connection, which uses a countersunk screw and a hex nut.

For protection against direct contact, to prevent accidental contact with live parts, insulating covers for the terminals are installed on the base and the circuit breaker.

To be able to organize the breaking of secondary switching circuits during the removal of the circuit breaker, a set of connectors for secondary switching circuits is used. The kit consists of a mounting frame and the connectors themselves.

At the same time, the base has a design that allows the installation of a set of connectors for secondary switching circuits, as well as the installation of insulating covers for the outputs. The base is made of PA 66 polyamide plastic.

The withdrawable base for withdrawable circuit breakers can be mounted on a panel, in a panel cutout or on a DIN rail.

Brief Description of Drawings

FIG. 1 - General view of the withdrawable base for withdrawable circuit breakers.

FIG. 2 - General view of the movable part of the withdrawable base.

FIG. 3 - General view of the fixed part of the withdrawable base.

FIG. 4 - General view of the base.

FIG. 5 - Assembling the movable part of the withdrawable base.

FIG. 6 - Assembling the fixed part of the withdrawable base.

FIG. 7 - Installation process of the circuit breaker.

FIG. 8 - View of the positions of the circuit breaker.

FIG. 9 - View of withdrawable base mounting options.

Implementation of the utility model

The withdrawable base for withdrawable circuit breakers contains a fixed part (Figs. 3, 6) and a movable part (Figs. 2, 5), made with the possibility of interacting with the stationary part.

The movable part (Fig. 2, 5) consists of two panels of the movable part (3), which are interconnected by two rods (5) by means of a threaded connection, for example, bolts that are screwed into the rods (5). In this case, the rods (5) form handles for more convenient removal of the movable part. The circuit breaker (1) is clamped between the panels of the movable part (3) and fixed by the corners (6) made on the panels of the movable part (3). On each panel of the movable part (3), guide axes (7) are fastened by means of a screw connection. The screw connection uses a countersunk screw and a vibration-resistant clamp for bolts and screws. Insulating covers for terminals (4) are installed on the circuit breaker (1).

The fixed part consists of a plinth (9) and two panels of the fixed part (2) connected to the plinth (9). Each panel of the stationary part (2) contains a guide cutout (12) along which the guide axes (7) of the panels of the movable part (3) move. Each panel of the stationary part (2) contains a pivotable lever (10). Each lever (10) has a cutout (11), into which, when the lever is turned, the guide shaft (7) of the panel of the movable part (2) enters.

The guide axes (7) of the panels of the movable part are made by turning and milling, while the axes have two grooves, one of the grooves is made to move along the guide slots (12) of the panels of the stationary part (2), and the second groove is made to interact with the levers ( 10), while the second groove is made wider than the first. It is also possible that the guide axes (7) have one groove made to move along the guide cutouts (12) of the panels of the stationary part (2) and to interact with the levers (10).

On the panels of the stationary part (2), auxiliary contacts (not shown in the figure) are installed for signaling the position of the circuit breaker in the withdrawable base. On the panels of the movable part (3) guides (8) are fixed for the operation of the contacts signaling the position of the circuit breaker. In this case, the guides (8) are made of metal and are fixed with a screw connection, which uses a countersunk screw and a hex nut.

The base (9) provides the connection of the contacts of the circuit breaker (15) with the busbars. The base structure (Fig. 4) has places (13), made for installing insulating roof for the terminals (4) and a place (14), made for installing a set of connectors for secondary switching circuits. The base (9) is made of PA 66 polyamide plastic.

The roll-out base is assembled as follows. Two panels of the movable part (3) are interconnected by means of rods (5) and a threaded connection (Fig. 5). At the same time, the circuit breaker is clamped between the panels of the moving part (3) and fixed with the help of corners (6). This results in a rigid and reliable structure in which the rods (5) form handles for easy removal of the circuit breaker.

The two panels of the fixed part (2) are connected to the plinth by means of mounting plates (15) and a threaded connection, for example, bolts (Fig. 6). The fixed part is mounted on a panel, in a panel cutout or on a DIN rail (Fig. 9).

To install the circuit breaker in the stationary part (Fig. 7), the contacts (16) of the machine are lubricated with grease for electrical contacts. Then the movable part is inserted so that the guide axes (7) of the movable part enter the guiding cutouts (12) of the panels of the stationary part until they stop in the levers (10) - the "pumped out" position when the power circuit is disconnected, as in Fig. 8. Then the levers (10) are turned so that the guide pins (7) of the movable part enter the cutout (11) of the lever (10), the circuit breaker is fully inserted into the stationary part, and the contacts (16) are connected to the contacts of the base, and the switch is fixed in the connected position when the power circuit is on.

Thus, the presented withdrawable base for withdrawable circuit breakers has a robust design and facilitates the operation of the circuit breaker.

Claims (10)

1. A withdrawable base for withdrawable circuit breakers, characterized by the fact that it contains a fixed part and a movable part designed to interact with the fixed part, while the withdrawable base provides three positions of the circuit breaker: "connected", "withdrawn" and "removed", the movable part consists of two panels of the movable part, interconnected by rods that form handles, using a threaded connection, while the circuit breaker is clamped between the panels of the movable part and fixed by the corners made on the panels of the movable part, rigidly fixed to each panel of the movable part two guide axes, The stationary part consists of a base intended for connecting the contacts of the circuit breaker with the power buses, and two panels of the stationary part connected to the base, the panels of the stationary part contain a guide cutout along which the guide axes of the panels of the moving part move, each of the panels of the stationary part contains a lever, pivotable, each lever has a cutout, into which, when the lever is pivoted, the guide axis of the panel of the movable part enters. 2. A withdrawable base for withdrawable circuit breakers according to claim 1, characterized in that the guide axles are attached to the sides of the movable part by means of a screw connection, which uses a countersunk screw and a vibration-resistant retainer for bolted and screw connections. 3. Drawout base for withdrawable circuit breakers according to claim 1, characterized in that the guide axes of the movable part are made by turning and milling, and the axes have a groove made to move along the guide cutout of the panel of the stationary part and to interact with the lever. 4. A withdrawable base for withdrawable circuit breakers according to claim 1, characterized in that auxiliary contacts are installed on the panels of the stationary part, which serve to indicate the position of the circuit breaker, and on the panels of the moving part, guides are fixed for the operation of the contacts for signaling the position of the circuit breaker in the withdrawable base, the rails are made of metal and are secured with a screw connection, which uses a countersunk screw and a hex nut. 5. A withdrawable base for withdrawable circuit breakers according to claim 1, characterized in that the base design provides the possibility of installing a set of connectors for secondary switching circuits, as well as installing insulating covers for the outputs. 6. A withdrawable base for withdrawable circuit breakers according to claim 1 or 5, characterized in that the base is made of polyamide plastic PA 66. 7. A withdrawable base for withdrawable circuit breakers according to claim 1, characterized in that the insulating terminal covers are designed to be mounted on the base and the circuit breaker. 8. A withdrawable base for withdrawable circuit breakers according to claim 1, characterized in that it can be mounted on a panel, in a panel cutout or on a DIN rail.

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