CN209896012U

CN209896012U - Guide rail type small molded case circuit breaker

Info

Publication number: CN209896012U
Application number: CN201821979365.3U
Authority: CN
Inventors: 冷岩; 卢瑞明
Original assignee: Beijing Mingri Electrical Equipment Co Ltd
Current assignee: Beijing Mingri Electrical Equipment Co Ltd
Priority date: 2018-11-28
Filing date: 2018-11-28
Publication date: 2020-01-03
Anticipated expiration: 2028-11-28

Abstract

The utility model provides a guide tracked miniature molded case circuit breaker, owing to set up alloy resistance between the bimetallic strip of thermal overload release and the iron core of short circuit release, set up the integral type traction lever simultaneously, be provided with guide rail installation buckle in the bottom, make the utility model have good technical characteristics, owing to set up the integral type traction lever, it can be effectual to guarantee that tripping force and tripping time keep unanimous after the circuit breaker takes place the short circuit between each interelectrode, guarantee the true and reliable of instantaneous action current, owing to be provided with alloy resistance between bimetallic strip and armature, can effectually protect the bimetallic strip not burnt down when passing through the heavy current, can effectually restrict the short circuit current of circuit breaker simultaneously, owing to adopted many measures of reducing the circuit breaker volume, make the breaking capacity of this guide tracked miniature molded case circuit breaker reach the level of the like molded case circuit breaker, and can install and use on the guide like miniature circuit breaker, the guide rail type small molded case circuit breaker is widely applied to building electrical.

Description

Guide rail type small molded case circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus, concretely relates to small-size moulded case circuit breaker of guide tracked.

Background

The plastic case circuit breaker is a commonly used distribution protection electric appliance, has the functions of supplying power to a load and protecting overload and short circuit, and is widely applied to an electric power distribution system. Compared with a miniature circuit breaker with the same specification, the molded case circuit breaker has the advantages of large breaking current, strong overload capacity and stable working performance, but the molded case circuit breaker in the traditional technology has larger volume and is not suitable for guide rail installation, and the molded case circuit breaker which has the advantages of large breaking current, strong overload capacity and stable working performance, small volume and wide market prospect is designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to change the great drawback of present moulded case circuit breaker volume, design a small-size moulded case circuit breaker of guide tracked of disconnected electric current big, the overload capacity is strong, the working property is stable.

In order to achieve the above object, the utility model adopts the following technical scheme: a guide rail type small molded case circuit breaker comprises a bottom case, a thermomagnetic trip, a contact system, an arc extinguish chamber and a handle action mechanism;

the method is characterized in that: the thermal magnetic release comprises a thermal overload release and a short circuit release, wherein an alloy resistor is arranged between a bimetallic strip of the thermal overload release and an iron core of the short circuit release, one ends of the bimetallic strip and the alloy resistor are respectively connected with an external terminal of a moving contact of the guide rail type small molded case circuit breaker in parallel through flexible connection, and the other ends of the bimetallic strip and the alloy resistor are connected with the tail end of the moving contact of the circuit breaker in parallel through flexible connection;

the guide rail type small molded case circuit breaker is also provided with an integrated draw bar and an armature at the end of the draw bar;

the integrated traction rod comprises a traction rod support and an armature, the integrated traction rod is formed by integrally pressing the traction rod support and the armature, a limit boss is arranged on the traction rod support, the left side of the limit boss is provided with a traction rod action lock catch of the guide rail type small plastic shell circuit breaker, when the circuit breaker needs to be buckled again after tripping, the traction rod action lock catch directly comprises the limit boss which is hung and limited to realize the buckling again, when the circuit breaker needs to be tripped, the traction rod acts to release the hanging limit of the traction rod action lock catch, and the tripping limit of the handle action mechanism is released after the traction rod action lock catch acts to enable the circuit breaker to be tripped.

Further, the integrated traction rod support and the armature can be set to be two poles, three poles or four poles according to requirements, so that the requirements of different power supply loads of a single phase, a three-phase three-wire power supply load and a three-phase four-wire power supply load are met.

And the contact system comprises an integrated rotating shaft, each pole of the integrated rotating shaft is provided with a moving contact, and a contact terminal pressure adjusting torsion spring is arranged in the rotating shaft at the root of the moving contact, so that the moving contact and the static contact of the circuit breaker are elastically contacted and pressed, and the circuit breaker is stable and reliable in operation.

In a further arrangement, a guide rail mounting buckle is arranged at the lower part of the base of the guide rail type small molded case circuit breaker, so that the small molded case circuit breaker can be arranged in the small guide rail type distribution box like a miniature circuit breaker.

Above utility model small-size moulded case circuit breaker of guide tracked has beneficial effect be: because the armature iron and the traction rod of the circuit breaker are integrally pressed, the circuit breaker can effectively ensure that the tripping force and the tripping time are kept consistent after short circuit occurs between poles of the circuit breaker, and ensure the truth and reliability of instantaneous action current. Because the utility model discloses a circuit breaker adopts the multiple connection, is provided with alloy resistance between bimetallic strip and armature, can effectual protection the bimetallic strip is not burnt out when passing through the heavy current, simultaneously because be provided with alloy resistance in the short circuit return circuit of circuit breaker, can effectual restriction circuit breaker's short-circuit current, make the working property of circuit breaker is more reliable and more stable. The handle tripping device of traditional moulded case circuit breaker is provided with big hasp and little hasp, and the circuit breaker is detained again and is all just to make the circuit breaker detain again and the dropout through this intermediate link of little hasp when tripping, the utility model discloses a circuit breaker has cancelled little hasp and has directly set up big hasp, and it has simplified the structure of circuit breaker, makes the action of circuit breaker more swift reliable simultaneously. Because the compression spring for regulating the final pressure of the contact of the traditional molded case circuit breaker is changed into the tension spring, the draw bar is changed into the integrated draw bar, and the small lock catch of the tripping mechanism is cancelled, the measures not only effectively reduce the volume of the circuit breaker, but also improve the technical performance of the circuit breaker, so that the breaking capacity of the guide rail type small molded case circuit breaker reaches the level of the similar molded case circuit breaker, but also greatly reduce the volume of the circuit breaker, and the guide rail type small molded case circuit breaker can be installed and used on a guide rail like a miniature circuit breaker, and can be widely applied to building electrical.

Drawings

Fig. 1 is an overall structure diagram of the circuit breaker with the outer case removed according to the present invention;

fig. 2 is a main structure diagram of the circuit breaker after closing;

fig. 3 is a main structure diagram of the breaker after opening;

figure 4 is a diagram of the circuit breaker contacts and flexible connection junction of the present invention;

FIG. 5 is a sectional view of the alloy resistor arrangement of the circuit breaker of the present invention;

fig. 6 is the structure view of the integrated draw bar of the circuit breaker of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to fig. 1 to 6, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.

It should be noted that the terms "front end", "left side", "right side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.

A guide rail type small molded case circuit breaker is shown in figure 1 and comprises a bottom case 8, a thermomagnetic trip, a contact system, an arc extinguish chamber 9 and a handle action mechanism 1;

further setting, as shown in fig. 4 and 5, the thermomagnetic trip comprises a thermal overload trip and a short-circuit trip, an alloy resistor 4 is arranged between a bimetallic strip 2 of the thermal overload trip and an iron core 5 of the short-circuit trip, one end of the bimetallic strip 2 and one end of the alloy resistor 4 are respectively connected in parallel to an external terminal 701 of the moving contact of the circuit breaker through a flexible connection 201, and the other end of the bimetallic strip 2 and the other end of the alloy resistor 4 are connected in parallel to the tail end of the moving contact 7 of the circuit breaker through a flexible connection 202;

the guide rail type small molded case circuit breaker is also provided with an integrated draw bar 3;

further, as shown in fig. 2, 3 and 6, the integrated draw bar 3 comprises a draw bar support 304 and an armature 303, the draw bar support 304 and the armature 303 are integrally pressed, a limit boss 302 is arranged on the draw bar support 304, the circuit breaker draw bar action latch 102 is arranged on the left side of the limit boss 302, when the circuit breaker needs to be latched again after being tripped, the draw bar action latch 102 is directly hung and limited by the limit boss 302 to realize the re-latching, when the circuit breaker needs to be tripped, the draw bar 3 acts, the limit boss 302 releases the hanging limit of the draw bar action latch 102, the draw bar action latch 102 acts to release the limit of the trip 103 of the circuit breaker handle action mechanism 1, so that the circuit breaker is tripped.

Further, as shown in fig. 6, the integrated drawbar and armature may be set as two, three or four poles as required to meet the requirements of different power supply loads, such as single-phase, three-wire and three-phase four-wire.

Further, as shown in fig. 4, the contact system includes a movable contact 7, a movable contact external terminal 701, a fixed contact 703, a fixed contact external terminal 702, and an integrated rotating shaft 6, the movable contact 7 is disposed at each pole of the integrated rotating shaft 6, and a contact final pressure adjusting torsion spring 601 is disposed in the rotating shaft 6 at the root of the movable contact 7, so that the movable contact 7 and the fixed contact 703 of the circuit breaker are elastically contacted, and the operation is stable and reliable.

Further, as shown in fig. 1, a rail mounting buckle 801 is provided at a lower portion of the base 8 of the circuit breaker, so that the molded case circuit breaker can be disposed in a small rail type distribution box like a micro circuit breaker.

The utility model discloses action procedure of circuit breaker thermal overload release as follows: when the circuit breaker is overloaded and operated for a certain time, the bimetallic strip 2 generates heat and deforms, and when the bimetallic strip deforms to a certain degree, the push rod screw 204 at the upper part of the bimetallic strip 2 pushes the traction rod 3 to act, so that the hanging limit of the traction rod 3 on the action lock catch 102 is released, the trip buckle 103 of the handle action mechanism 1 acts, and the moving contact 7 of the circuit breaker rapidly acts under the action of the main tension spring 101, so that the circuit breaker is separated;

the utility model discloses circuit breaker short circuit release's action procedure as follows: when a load line is short-circuited, a large enough electromagnetic force is generated between the iron core 5 and the armature 303 due to an overlarge current, the armature 303 is attracted by the iron core 5, the draw bar 3 acts, the hanging limit of the draw bar 3 on the action latch 102 is released, the trip catch 103 of the handle action mechanism 1 acts, and the movable contact 7 of the circuit breaker rapidly acts under the action of the main tension spring 101, so that the circuit breaker is opened.

It is obvious that the above examples are given by way of illustration only and not by way of limitation, and that various other modifications and variations will be apparent to those skilled in the art in light of the above teachings, and it is not necessary or necessary to exhaustively enumerate all the embodiments herein, and all such modifications and variations as are obvious are within the scope of the invention.

Claims

1. A guide rail type small molded case circuit breaker comprises a bottom case, a thermomagnetic trip, a contact system, an arc extinguish chamber and a handle action mechanism;

the method is characterized in that: the thermomagnetic release comprises a thermal overload release and a short-circuit release, and an alloy resistor is arranged between a bimetallic strip of the thermal overload release and an iron core of the short-circuit release;

the guide rail type small molded case circuit breaker is provided with an integrated draw bar;

and the left side of the integrated traction rod is provided with the action lock catch of the circuit breaker traction rod.

2. The rail-type small molded case circuit breaker according to claim 1, wherein: one end of the bimetallic strip and one end of the alloy resistor are respectively connected with an external terminal of the moving contact of the circuit breaker in parallel through flexible connection, and the other ends of the bimetallic strip and the alloy resistor are connected with the tail end of the moving contact of the circuit breaker in parallel through flexible connection.

3. The rail-type small molded case circuit breaker according to claim 1, wherein: the integrated draw bar comprises a draw bar support and an armature, the integrated draw bar is formed by integrally pressing the draw bar support and the armature, a limiting boss is arranged on the integrated draw bar support, and a draw bar action lock catch of the circuit breaker is arranged on the left side of the limiting boss.

4. The rail-type small molded case circuit breaker according to claim 3, wherein: the integrated traction rod support and the armature can be set to be two poles, three poles or four poles according to requirements.

5. The rail-type small molded case circuit breaker according to claim 1, wherein: the contact system comprises an integrated rotating shaft, a moving contact is arranged in each pole of the integrated rotating shaft, and a contact final pressure adjusting torsion spring is arranged in the rotating shaft at the root of the moving contact.

6. The rail-type small molded case circuit breaker according to claim 1, wherein: and a guide rail mounting buckle is arranged at the lower part of the base of the guide rail type small molded case circuit breaker.