CN211150451U

CN211150451U - Overload alarm non-tripping device for molded case circuit breaker

Info

Publication number: CN211150451U
Application number: CN201921329718.XU
Authority: CN
Inventors: 张华夏; 徐涛; 孙兰萍
Original assignee: Liangxin Electrical Appliances Haiyan Co ltd; Shanghai Liangxin Electrical Co Ltd
Current assignee: Liangxin Electrical Appliances Haiyan Co ltd; Shanghai Liangxin Electrical Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-07-31
Anticipated expiration: 2029-08-15

Abstract

The utility model discloses a moulded case circuit breaker overload alarm does not trip gear, it includes support (4), and install on support (4) through back shaft (3) traction lever (2), and spring (7) one end that resets is adorned on traction lever (2), and the other end dress provides the power that resets for traction lever (2) on support (4), and hot element (6) are fixed on the base, its characterized in that: the support (4) is fixedly arranged on the thermal element (6). The stability of the overload alarm function and the stability of the characteristics of the bimetallic strip are improved, the output force value of the heated and bent bimetallic strip is also improved, and the reliability of the overload alarm function is improved; on the other hand, the bending angle of the bimetallic strip is smaller, so that the material length of the bimetallic strip is reduced, the manufacturing cost is reduced, and the product economy is improved.

Description

Overload alarm non-tripping device for molded case circuit breaker

Technical Field

The utility model belongs to the technical field of moulded case circuit breaker, specifically say so and relate to a moulded case circuit breaker overload alarm does not trip gear.

Background

The moulded case circuit breaker is a low-voltage circuit protection device and has the functions of overload, short circuit and undervoltage protection. The circuit breakers are of various types, wherein the molded case circuit breakers are commonly used, and the housing adopts a plastic insulator for isolating the metal part from the conductor and grounding the metal part. When the current exceeds a set value, the molded case circuit breaker can automatically cut off the current, and the effect of protecting the load is achieved. However, in specific applications, it is necessary for a circuit breaker to provide a special protection function in certain special applications, namely, when the distribution line is overloaded, the function of the circuit breaker to send out an alarm signal without tripping the circuit breaker, such as unpredictable faults of the distribution line in a fire fighting system and emergency starting of a fire pump, may cause the overload, but in order to gain valuable time for handling the fault, the circuit breaker is not tripped at the fault level, but the alarm signal is sent out so that a user of the circuit breaker can make judgment and corresponding decision according to the special conditions of the site in use at the time. Only when the load of the main circuit has a short-circuit fault, the circuit should be immediately cut off. An overload alarm trip device is needed in the power system to ensure the continuity of power supply. The traditional circuit breaker can immediately and automatically cut off a circuit after overload alarm, can not make judgment and corresponding decision by a user according to actual conditions, and has single function and poor universality.

Chinese patent 200710023955.9 discloses a plastic-shell circuit breaker with thermal overload alarm function, which comprises a base with a cover and a thermal overload mechanism installed on the base and composed of a thermal element, a bimetallic element and an adjustable contact member, wherein the thermal element is fixed in a thermal element cavity on the base, the lower end of the bimetallic element is connected with the thermal element, and the adjustable contact member is arranged at the upper end of the bimetallic element. This circuit breaker overload alarm does not trip gear when some special needs occasion, circuit breaker take place to transship or short circuit, can not trip under the fault level, but can send alarm signal to make the circuit breaker user can make judgement and corresponding decision according to the special condition at the time use scene, can carry out a plurality of function selections, the commonality is good, adapts to different operational environment needs. However, the position relationship between the overload alarm module and the bimetallic strip is not relatively static, so that the overload alarm function is unstable; according to the technical scheme, the bimetal strip needs to wind to the rear side of the alarm traction rod to be heated and bent to push the alarm traction rod to rotate to trigger an alarm signal, so that the bending angle of the bimetal strip is too large, the characteristics of bimetal are unstable, and further, the delay parameter is unstable; and the length of the bimetallic strip is too long, the output force value is small and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical defects of the prior art, and provides a tripping device for overload alarm of a molded case circuit breaker, which improves the stability of the overload alarm function and the stability of the characteristics of a bimetallic strip, improves the output value of the thermal bending of the bimetallic strip, and improves the reliability of the overload alarm function; on the other hand, the bending angle of the bimetallic strip is smaller, so that the material length of the bimetallic strip is reduced, the manufacturing cost is reduced, and the product economy is improved.

Technical scheme

In order to realize above-mentioned technical purpose, the utility model provides a moulded case circuit breaker overload alarm does not trip gear, it includes the support, and the traction lever passes through the back shaft to be installed on the support, and reset spring one end dress is on the traction lever, and the other end dress provides the power that resets for the traction lever on the support, and the hot element is fixed on the base, its characterized in that: the holder is fixedly attached to the thermal element.

Preferably, the device further comprises an alarm signal collector, wherein the alarm signal collector is mounted on the traction rod, and the alarm signal collector mounted on the traction rod can be triggered to output a signal in the rotation process of the traction rod.

Preferably, the bracket is provided with an inclined boss corresponding to the alarm signal collector and capable of triggering the alarm signal collector.

Preferably, the draw bar is capable of rotating around the support shaft, and the draw bar and the adjusting feeler are capable of being linked by the adjusting feeler to rotate around the support shaft.

Preferably, the draw bar is provided with an alarm signal collector mounting limit table, and the alarm signal collector is fixedly mounted on a mounting seat of the draw bar through a mounting hole on the draw bar by a fastener.

Preferably, the support shaft penetrates through the first hole in one side of the support, the through hole of the traction rod and the second hole in the other side of the support, the step on the support shaft abuts against the inner side face of the second hole to achieve limiting, and the clamp spring is installed in a clamp spring groove at one end of the second hole in which the support shaft penetrates.

Preferably, the alarm signal collector is a micro switch or a travel switch or a proximity switch.

Preferably, the bimetallic strip is fixed to the thermal element, and the actuating trip is mounted in a mounting hole in the bimetallic strip.

Preferably, one end of the return spring is hung on a first hook of the support, and the other end of the return spring is hung on a second hook of the traction rod.

Advantageous effects

The utility model provides a pair of moulded case circuit breaker overload alarm does not trip gear. The overload alarm non-tripping device is fixed on the thermal element through the fastener, so that the positions of a draw bar and a bimetallic strip in the device are relatively static, and the stability of the overload alarm function is improved; the material length and the bending angle of the bimetallic strip in the overload alarm non-tripping device are reduced, the risk that the characteristic of the bimetallic strip is damaged when the bimetallic strip is bent at a large angle is reduced, the stability of the characteristic of the bimetallic strip is improved, the output force value of the heated and bent bimetallic strip is also improved, and the reliability of an overload alarm function is improved; on the other hand, the bimetallic strip is arranged on the front side of the alarm traction rod, when the bimetallic strip is heated and bent, the alarm traction rod is pulled to rotate through the adjusting screw on the bimetallic strip, so that an alarm signal is triggered, the bending angle of the bimetallic strip is small, the material length of the bimetallic strip is reduced, the manufacturing cost is reduced, and the product economy is improved.

Drawings

Fig. 1 is a schematic view of an installation structure of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the present invention;

fig. 3 is a schematic structural view of a bracket according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a drawbar in an embodiment of the present invention;

fig. 5 is a schematic structural view of a support shaft in an embodiment of the present invention;

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Examples

As shown in fig. 1, the overload alarm non-tripping device for the molded case circuit breaker comprises an alarm signal collector 1, in this embodiment, the alarm signal collector 1 is a micro switch, a travel switch or a proximity switch, the alarm signal collector 1 is mounted on a drawbar 2, and the alarm signal collector 1 mounted on the drawbar 2 can be triggered to output a signal in the rotation process. The draw bar 2 is provided with an alarm signal collector mounting limit table 201, and the fastener 8 fixes the alarm signal collector 1 on a mounting seat 202 of the draw bar 2 through a mounting hole on the draw bar 2. As shown in fig. 3, an inclined boss 401 corresponding to the alarm signal collector 1 is arranged on the bracket 4 and can trigger the alarm signal collector 1.

As shown in fig. 1, 2, 3 and 4, the traction rod 2 is mounted on the bracket 4 through the support shaft 3, the traction rod 2 can rotate around the support shaft 3, the support shaft 3 penetrates through the first hole 402 on one side of the bracket 4 and the through hole 204 of the traction rod 2 and then penetrates out of the second hole 403 on the other side of the bracket 4, the step 301 on the support shaft 3 abuts against the inner side surface of the second hole 403 to achieve limiting, and the snap spring 9 is mounted in the snap spring groove 302 at one end of the second hole 403 through which the support shaft 3 penetrates.

As shown in fig. 1 and 2, the drawbar 2 and the adjustment trip 5 can be pulled by the adjustment trip 5 to rotate around the support shaft 3, the bracket 4 is fixedly mounted on the thermal element 6, the thermal element 6 is mounted in the thermal element cavity of the base, the bimetal 10 is fixed on the thermal element 6, the thermal element 6 is mounted in the thermal element cavity a1 of the base a, and the adjustment trip 5 (the adjustment screw 11 in this embodiment) is mounted in the mounting hole 10a of the bimetal 10. One end of a return spring 7 is arranged on the traction rod 2, and the other end is arranged on the bracket 4 to provide return force for the traction rod 2. In this embodiment, one end of the return spring 7 is hung on the first hook 404 of the bracket 4, and the other end is hung on the second hook 205 of the drawbar 2.

When the working circuit is not in fault, the traction rods 2 are all at initial positions, and the alarm signal collector 1 does not send out alarm signals when in the initial state.

When the working circuit has overload fault, the thermal element 6 generates heat larger than that in normal working due to overlarge current, so that the bimetallic strip 10 drives the adjusting touch piece 5 to move towards the direction of the traction rod 2, the alarm signal collector 1 moves along with the traction rod 2, and when the thermal element is in contact with the inclined boss 401, the contact on the alarm signal collector 1 is touched, and an overload alarm signal is sent.

The structure, ratio, size and the like shown in the drawings attached to the present embodiment are only used for matching with the disclosure of the specification, so as to be known and read by those skilled in the art, and are not used to limit the practical limit condition of the present invention, so that the present invention does not have the essential meaning in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.

Claims

1. Moulded case circuit breaker overload alarm does not trip gear, it includes support (4), and install on support (4) through back shaft (3) traction lever (2), and reset spring (7) one end dress is on traction lever (2), and the other end dress provides the power that resets for traction lever (2) on support (4), and hot component (6) are fixed on the base, its characterized in that: the support (4) is fixedly arranged on the thermal element (6).

2. The molded case circuit breaker overload alarm trip gear of claim 1, wherein: the alarm device is characterized by further comprising an alarm signal collector (1), wherein the alarm signal collector (1) is installed on the traction rod (2), and the alarm signal collector (1) installed on the traction rod (2) can be triggered to output signals in the rotating process of the traction rod (2).

3. The molded case circuit breaker overload alarm trip gear of claim 2, wherein: the bracket (4) is provided with an inclined boss (401) corresponding to the alarm signal collector (1) and capable of triggering the alarm signal collector (1).

4. The molded case circuit breaker overload alarm trip gear of claim 2, wherein: the draw bar (2) can rotate around the support shaft (3), and the draw bar (2) and the adjusting touch piece (5) can be linked to enable the draw bar to be pulled by the adjusting touch piece (5) so as to rotate around the support shaft (3).

5. The molded case circuit breaker overload alarm trip gear of claim 2, wherein: the alarm signal collector is characterized in that the draw bar (2) is provided with an alarm signal collector mounting limit table (201), and the fastener (8) fixedly mounts the alarm signal collector (1) on a mounting seat (203) of the draw bar (2) through a mounting hole (202) on the draw bar (2).

6. The molded case circuit breaker overload alarm trip gear of claim 2, wherein: the support shaft (3) penetrates through a first hole (402) in one side of the support (4) and a second hole (403) in the other side of the support (4) after penetrating through a through hole (204) of the traction rod (2), a step (301) in the support shaft (3) abuts against the inner side face of the second hole (403) to achieve limiting, and the clamp spring (9) is installed in a clamp spring groove (302) in one end, penetrating through the second hole (403), of the support shaft (3).

7. The molded case circuit breaker overload alarm trip gear of claim 2, wherein: the alarm signal collector (1) is a microswitch, a travel switch or a proximity switch.

8. The molded case circuit breaker overload alarm trip gear of claim 3, wherein: the bimetallic strip (10) is fixed on the thermal element (6), and the adjusting contact piece (5) is arranged in a mounting hole (10a) on the bimetallic strip (10).

9. The molded case circuit breaker overload alarm trip gear of claim 3, wherein: one end of the reset spring (7) is hung on the first hook (404) of the bracket (4), and the other end of the reset spring is hung on the second hook (205) of the traction rod (2).