CN215069850U

CN215069850U - Auxiliary contact of circuit breaker

Info

Publication number: CN215069850U
Application number: CN202121685726.5U
Authority: CN
Inventors: 韩志刚; 郦琪
Original assignee: Schneider Electric China Co Ltd
Current assignee: Schneider Electric China Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-12-07
Anticipated expiration: 2031-07-23

Abstract

The utility model discloses a circuit breaker auxiliary contact, include: the contact device comprises an auxiliary contact body, a microswitch, a pressing rod and an auxiliary contact action piece; one end of the pressing rod is a fixed end and is fixedly connected with the auxiliary contact body; the other end of the pressing rod is a free end; the auxiliary contact action piece is movably arranged on the auxiliary contact body and is opposite to the first side of the free end of the pressing rod; the microswitch is arranged on the auxiliary contact body, and a microswitch button of the microswitch is opposite to a second side between the fixed end and the free end of the pressing rod; the trigger action of the auxiliary contact can be transmitted to the microswitch button sequentially through the auxiliary contact action piece and the pressing rod. Has the advantages that: the circuit breaker with the limited volume can realize that the small microswitch meets the triggering stroke of a large circuit breaker body by using a simple structure, effectively amplifies the overtravel of the microswitch under the action of a lever effect, and has the characteristics of small volume, simple structure, large triggering stroke range and high reliability.

Description

Auxiliary contact of circuit breaker

Technical Field

The utility model relates to a circuit breaker technical field, in particular to circuit breaker auxiliary contact.

Background

The auxiliary contact is an accessory mounted on the circuit breaker body, and the existing auxiliary contact generally adopts an existing microswitch as a main trigger switching element.

The trigger button of the microswitch is linearly movable and has three basic states, namely a free position (Rest position), a triggering position (operating position) and a maximum stroke position (totaltravel position). When using a microswitch, it is necessary to ensure that:

1. the driving mechanism can exceed the triggering position when being pressed each time, and the microswitch is ensured to be triggered;

2. the maximum stroke position is not exceeded, and the structure of the microswitch body is not damaged.

The difference between the maximum travel position and the trigger position is the over travel (Overtravel) of the micro-switch. When a certain type of microswitch is selected, the overtravel is determined and can fluctuate within a fixed tolerance range above and below a fixed nominal value.

Due to structural limitations, the smaller the volume of the microswitch, the smaller the over travel. A small volume microswitch necessarily has only a small trigger stroke. However, the circuit breaker body providing the triggering action is fixed in the provided triggering stroke, which is usually much larger than the micro-motion triggering stroke, and the circuit breaker body and the micro-motion triggering stroke cannot be directly matched for use.

And meanwhile, the size of the circuit breaker body structure capable of accommodating the micro switch is limited. Therefore, how to realize a small microswitch in a circuit breaker with a limited volume by using a simple structure to meet the triggering stroke of a large circuit breaker body becomes an important technical problem to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a circuit breaker auxiliary contact to overcome exist among the above-mentioned background art not enough, have simple structure, small and the high characteristics of reliability.

In order to achieve the above object, the utility model provides a following technical scheme:

a circuit breaker auxiliary contact comprising: the contact device comprises an auxiliary contact body, a microswitch, a pressing rod and an auxiliary contact action piece;

one end of the pressing rod is a fixed end and is fixedly connected to the auxiliary contact body; the other end of the pressing rod is a free end;

the auxiliary contact actuating piece is movably arranged on the auxiliary contact body and is opposite to the first side of the free end of the pressing rod;

the microswitch is arranged on the auxiliary contact body, and a microswitch button of the microswitch is opposite to a second side between the fixed end and the free end of the pressing rod;

the trigger action of the auxiliary contact can be transmitted to the microswitch button sequentially through the auxiliary contact action piece and the pressing rod.

Preferably, the pressing rod is made of a metal material.

Preferably, the auxiliary contact actuator and the microswitch button have a force to arm ratio of greater than 2: 1.

Preferably, the auxiliary contact actuator is an auxiliary contact button.

Preferably, the method further comprises the following steps: the left cover and the right cover are respectively fixed on two sides of the auxiliary contact body;

the auxiliary contact action piece is arranged between the left cover and the right cover in a limiting mode.

Preferably, the number of the micro switches and the pressing rods is one-to-one;

the auxiliary contact action piece is provided with at least two lapping surfaces, and the two lapping surfaces are respectively matched with the two pressing rods in a one-to-one correspondence mode.

Preferably, the plurality of micro switches are arranged in parallel, and the plurality of pressing levers are arranged in parallel.

Preferably, the auxiliary contact body is provided with a guide post, and the guide post is positioned between the two pressing rods;

the auxiliary contact action piece is provided with a guide groove used for being matched with the guide post, and the guide groove is positioned between the two lapping surfaces.

Preferably, the auxiliary contact body is provided with a first limiting structure and a second limiting structure;

the first limiting structure and the second limiting structure are respectively positioned on the second sides of the free ends of the two pressing rods and used for limiting the deformation of the free ends of the pressing rods.

According to the technical scheme, the utility model provides a circuit breaker auxiliary contact, on the auxiliary contact action was applied to through circuit breaker auxiliary contact's trigger action, thereby the auxiliary contact action promotes the press rod of metal material, presses the button that the press rod rotated and promoted micro-gap switch, realizes micro-gap switch's switching. And the conducting wire of the microswitch is connected to other equipment, so that the transmission of the auxiliary contact signal is realized. In addition, the quantity of the micro-switches and the pressing rods is a plurality of one-to-one opposite to each other, and under the action of the auxiliary contact action piece, the multi-path auxiliary contact signals are provided.

Has the advantages that: the positions of the pressing rod contacting the auxiliary contact action piece and the microswitch button are different, and the overtravel of the microswitch is effectively amplified through a lever effect. Meanwhile, the stainless steel pressing rod is utilized to achieve the structural characteristic and the material characteristic of the pressing rod, the problem that the auxiliary contact of the self-adaptive circuit breaker is deflected in triggering stroke under the condition of long service life is well solved, and the high reliability of the product is improved. In addition, the installation position of the multi-path microswitch can be increased by properly modifying the structure of the body and the structure of the button, so that the synchronous triggering of the multi-path auxiliary contact can be realized. Compared with the prior art, the device has the characteristics of simple structure, small volume and high reliability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of an auxiliary contact of a circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a pressing type auxiliary contact of an auxiliary contact of a circuit breaker according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a limiting and guiding structure of an auxiliary contact of a circuit breaker according to an embodiment of the present invention;

fig. 4 is a schematic view of another limiting and guiding structure of the auxiliary contact of the circuit breaker according to the embodiment of the present invention;

fig. 5 is an overall structural diagram of a single button pressing two micro switches according to an embodiment of the present invention.

The contact structure comprises an auxiliary contact body 11, a guide column 111, a first limiting structure 112, a second limiting structure 113, a first limiting structure and a second limiting structure, wherein the auxiliary contact body is arranged on the guide column; 12-left cover; 13-right cover; 2-a microswitch; 3-pressing the lever; 4-auxiliary contact actuator, 41-guide groove, 42-contact surface.

Detailed Description

The utility model discloses an auxiliary contact of a circuit breaker, which applies the triggering action of the auxiliary contact on an auxiliary contact action piece, pushes a press rod to realize the switching of a micro-gap switch button, and switches the micro-gap switch button on other equipment to realize the transmission of auxiliary contact signals; has the characteristics of small volume, simple structure and high reliability.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model provides a circuit breaker auxiliary contact, include: the contact device comprises an auxiliary contact body 11, a microswitch 2, a pressing rod 3 and an auxiliary contact action piece 4;

one end of the pressing rod 3 is a fixed end and is fixedly connected with the auxiliary contact body 11; the other end of the pressing rod 3 is a free end;

the auxiliary contact point action piece 4 is movably arranged on the auxiliary contact point body 11 and is opposite to the first side of the free end of the pressing rod 3;

the microswitch 2 is arranged on the auxiliary contact body 11, and a microswitch button 21 of the microswitch 2 is opposite to a second side between the fixed end and the free end of the pressing rod 3;

the triggering action of the auxiliary contact can be transmitted to the microswitch button 21 in turn via the auxiliary contact actuator 4 and the push rod 3.

According to the above technical scheme, the embodiment of the utility model provides a circuit breaker auxiliary contact, see fig. 2, its theory of operation is: the trigger action of the auxiliary contact of the circuit breaker acts on the auxiliary contact action piece 4, so that the auxiliary contact action piece 4 pushes the pressing rod 3 to push the button 21 of the microswitch in a rotating mode, and the switching of the microswitch 2 is realized. Meanwhile, the transmission of the auxiliary contact signal can be realized by connecting the lead of the microswitch 2 to other equipment.

By the design, the small microswitch can meet the triggering stroke of the large auxiliary contact body in the circuit breaker with limited volume by using a simple structure; and effectively amplifies the overtravel of the microswitch 2 under the action of lever effect, and solves the limitation that the microswitch with small volume only has small triggering stroke. Compared with the prior art, the trigger device has the characteristics of small volume, simple structure, large trigger stroke range and high reliability.

Preferably, the pressing rod 3 is made of a metal material. So design, firstly long service life selects for use the metal material for use, and the reliability of structure can obtain very big assurance.

Specifically, the pressing rod 3 is made of stainless steel, and after the pressing exceeds the maximum overtravel position, the pressing rod 3 can provide larger overtravel through the elastic and plastic deformation of itself.

Further, the auxiliary contact actuator 4 and the microswitch button 21 have a force to arm ratio greater than 2: 1.

It should be noted that the microswitch button 21 is vertically arranged at the second side between the fixed end and the free end of the pressing rod 3, and the distance of the vertical line between the microswitch button 21 and the free end of the pressing rod 3 is greater than one half of the length of the pressing rod 3; therefore, the lever effect is fully utilized, the overtravel of the microswitch 2 is effectively amplified, and the microswitch has the characteristics of labor saving, simple structure and large overtravel.

In this embodiment, the auxiliary contact actuator 4 is an auxiliary contact button.

It should be noted that, the trigger action is provided by pressing, so that points of parts needing to be accurately controlled are reduced, the production and the manufacture are facilitated, the volume is greatly reduced, and the ultra-large trigger stroke is provided in a limited space; compared with the prior art, the device has the characteristics of small volume and convenience in production and manufacture.

The embodiment of the utility model provides a circuit breaker auxiliary contact, see figure 5, still include: a left cover 12 and a right cover 13 fixed to both sides of the auxiliary contact body 11, respectively;

the auxiliary contact point action part 4 is limited and arranged between the left cover 12 and the right cover 13.

It should be noted that, because the left cover 12 and the right cover 13 are fixed at two sides of the auxiliary contact body 11, and the auxiliary contact actuator 4 is installed between the left cover 12 and the right cover 13 in a limited manner, the auxiliary contact actuator 4 is fixed and prevented from coming off; compared with the prior art, the device has the characteristics of simple limiting mode and good protection performance.

In the scheme, the quantity of the micro switches 2 and the pressing rods 3 is one-to-one opposite;

the auxiliary contact actuator 4 has at least two contact surfaces 42, and the two contact surfaces 42 are respectively fitted to the two pressing levers 3 in a one-to-one correspondence.

It should be noted that the numbers of the micro switches 2 and the pressing rods 3 are selected to be a plurality of one-to-one correspondence, and the auxiliary contact actuator 4 has at least two contact surfaces 42, so that multiple auxiliary contact signals are provided for the circuit breaker in a limited volume under the condition of ensuring a large triggering stroke; specifically, two lap joint surfaces 42 are respectively matched with two pressed rods 3 in a one-to-one correspondence manner, so that two paths of auxiliary contact signals can be provided for the circuit breaker. Compared with the prior art, the auxiliary contact has the characteristic of high flexibility in selecting the auxiliary contacts.

Preferably, referring to fig. 5, the plurality of micro switches 2 are arranged in parallel, and the plurality of pressing rods 3 are arranged in parallel. So design is based on the consideration to micro-gap switch 2 and press the depression bar 3 structure, takes parallel arrangement's mode, can guarantee that micro-gap switch 2 promotes better rather than the one-to-one press the depression bar 3, guarantees trigger signal's transmission, has the simple and good characteristics of trigger effect of trigger mode.

Further, referring to fig. 1, the auxiliary contact body 11 is provided with a guide post 111, and the guide post 111 is located between the two pressing rods 3;

the auxiliary contact actuator 4 is provided with a guide groove 41 for cooperating with the guide post 111, and the guide groove 41 is located between the two bridging surfaces 42.

It should be noted that, in order to ensure that the auxiliary contact actuator 4 can synchronously press the left and right microswitches when sliding upwards, the body 11 is provided with a guide post 111, and the guide groove 41 on the auxiliary contact actuator 4 can be matched with the guide post 111 to ensure that the auxiliary contact actuator 4 vertically moves, so that it is ensured that the two pressing rods 3 can be simultaneously and effectively pressed, thereby realizing the synchronous switching of the two auxiliary contacts. Compared with the prior art, the synchronous pressing device has the characteristics of simple pressing structure and good synchronous pressing effect.

In order to optimize the above technical solution, referring to fig. 1, 3 and 4, the auxiliary contact body 11 is provided with a first limiting structure 112 and a second limiting structure 113;

the first limiting structure 112 and the second limiting structure 113 are respectively located on the second sides of the free ends of the two pressing rods 3 and are used for limiting the deformation amount of the free ends of the pressing rods 3.

It should be noted that, due to the existence of the first limit structure 112 and the second limit structure 113, when the trigger stroke offset of the circuit breaker auxiliary contact is too large, before the pressing rod 3 is deformed by pressing beyond the strength of the metal material per se, the top end of the pressing rod 3 can be blocked by the

limit structures

112 and 113 inside the body 11, so as to prevent the pressing rod 3 from being pressed excessively to break and fail. This scheme is so designed, has that the protectiveness is strong and spacing effectual characteristics.

The present solution is further described below with reference to specific embodiments.

The embodiment of the utility model provides a supplementary contact button promotes micro-gap switch and presses the structure of depression bar.

1. The trigger action of the auxiliary contact of the circuit breaker is applied to an auxiliary contact action piece 4 (specifically, an auxiliary contact button here), the auxiliary contact button pushes a pressing rod 3 made of a metal material, and the pressing rod 3 rotates to push a button 21 of a micro switch, so that the micro switch 2 is switched. The conducting wire of the microswitch 2 is connected to other equipment, and the transmission of the auxiliary contact signal is realized. Wherein the content of the first and second substances,

a) the positions of the pressing rod 3 contacting the auxiliary contact button and the microswitch button 21 are different, the force-arm ratio is more than 2:1, and the over travel of the microswitch 2 is effectively amplified through the lever effect.

b) The pressing rod 3 is made of stainless steel, and after the maximum overtravel position is exceeded by pressing, the pressing rod 3 provides larger overtravel through the elasticity and plastic deformation of the pressing rod.

c) In addition, after multiple opening and closing operations, the trigger stroke of the auxiliary contact of the circuit breaker body can deviate, a micro switch is needed to adapt to larger overtravel, and the overtravel of the common micro switch is fixed.

Therefore, the embodiment of the utility model provides a structure, metal are pressed 3 one ends of depression bar and are fixed on fine motion 2 through a pair of round hole, press the depression bar 3 and can rotate round the round hole. When the trigger stroke of the auxiliary contact of the circuit breaker is too large and exceeds the maximum micro-motion stroke position, the metal pressing rod 3 can generate elastic and plastic deformation in the rotating process. Ansys simulation verifies that the plastic deformation amount of a single high-speed pressing is about 0.7 mm. After a plurality of times of pressing, the permanent deformation of the pressing rod can be accumulated until the accumulated permanent phase change amount offsets the offset of the trigger stroke of the auxiliary contact of the breaker body, and then the plastic deformation amount of single pressing is 0, so that the product completes the self-adaption to the breaker.

2. The embodiment of the utility model provides a designed simultaneously and pressed two micro-gap switch's structure with an auxiliary contact button.

Based on the microswitch triggering mechanism described above, a super mini micro motion can be selected, thereby providing the possibility of realizing two paths of auxiliary contact signals in terms of volume.

Specifically, the embodiment of the present invention designs a structure in which a single auxiliary contact action 4 (here specifically an auxiliary contact button) pushes two paths of micro switches 2. The auxiliary contact button is installed inside the housing body 11, and is driven by an auxiliary contact driving rod of an external circuit breaker, the auxiliary contact button is pressed upwards, two overlapping surfaces 42 of the auxiliary contact button move upwards simultaneously, two pressing rods 3 move upwards about the pushing, and the two pressing rods 3 press the buttons 21 of the left and right microswitches upwards, so that synchronous switching of the left and right auxiliary contacts is realized. The left cover 12 and the right cover 13 are fixed on the body 11 to ensure that the auxiliary contact button is not separated.

3. In order to ensure that the auxiliary contact button can synchronously press the left and right microswitches when sliding upwards, the body 11 is provided with the guide post 111, the guide groove 41 on the auxiliary contact button can be matched with the guide post 111 to ensure the vertical movement of the button, so that the two pressing rods 3 can be effectively pressed simultaneously, and the synchronous switching of the two auxiliary contacts can be realized.

4. When the offset of the trigger stroke of the auxiliary contact of the circuit breaker is too large, before the pressing rod 3 is allowed by the pressing deformation exceeding the strength of the metal material per se, the top end of the pressing rod 3 can be blocked by the limiting

structures

112 and 113 in the body 11, so that the pressing rod 3 is prevented from being excessively pressed to break and fail.

To sum up, the utility model discloses an aim at:

in the circuit breaker with limited volume, under the requirement of long service life and high reliability, the small microswitch meets the triggering stroke of a large circuit breaker body by using a simple structure, and can provide 2 or more paths of auxiliary contact signals.

The embodiment of the utility model provides an advantage lies in:

1. the design structure is simple, the number of points of parts needing accurate control is small, and the device has good production and manufacturing advantages and volume advantages.

2. The stainless steel pressing rod has the advantages that the structural characteristic and the material characteristic of the stainless steel pressing rod are utilized, the problem of the triggering travel deviation of the auxiliary contact of the self-adaptive circuit breaker under the condition of long service life is well solved, high reliability of products is provided, and the technology can be used for partial products with micro motion.

3. The design can increase the mounting position of one-way microswitch by properly modifying the body structure and the auxiliary contact button structure, thereby realizing the synchronous triggering of multiple auxiliary contacts.

4. After the product is disassembled, whether the technology is used or not can be intuitively seen from the structure.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circuit breaker auxiliary contact, comprising: the contact device comprises an auxiliary contact body (11), a microswitch (2), a pressing rod (3) and an auxiliary contact action piece (4);

one end of the pressing rod (3) is a fixed end and is fixedly connected to the auxiliary contact body (11); the other end of the pressing rod (3) is a free end;

the auxiliary contact actuating piece (4) is movably arranged on the auxiliary contact body (11) and is opposite to the first side of the free end of the pressing rod (3);

the microswitch (2) is arranged on the auxiliary contact body (11), and a microswitch button (21) of the microswitch (2) is opposite to a second side between the fixed end and the free end of the pressing rod (3);

the trigger action of the auxiliary contact can be transmitted to the microswitch button (21) through the auxiliary contact action piece (4) and the pressing rod (3) in sequence.

2. Auxiliary contact for circuit breakers according to claim 1, characterized in that said pressing rod (3) is made of metal.

3. Circuit breaker auxiliary contact according to claim 1, characterized in that the auxiliary contact actuator (4) and the microswitch button (21) have a force to arm ratio greater than 2: 1.

4. Auxiliary contact of a circuit breaker according to claim 1, characterized in that the auxiliary contact actuator (4) is an auxiliary contact button.

5. The circuit breaker auxiliary contact of claim 1, further comprising: a left cover (12) and a right cover (13) respectively fixed on two sides of the auxiliary contact body (11);

the auxiliary contact motion piece (4) is arranged between the left cover (12) and the right cover (13) in a limiting mode.

6. The circuit breaker auxiliary contact according to claim 1, characterized in that the number of said microswitches (2) and said pressing rods (3) is one-to-one;

the auxiliary contact point action piece (4) is provided with at least two overlapping surfaces (42), and the two overlapping surfaces (42) are respectively matched with the two pressing rods (3) in a one-to-one correspondence mode.

7. Auxiliary contact of circuit breaker according to claim 6, characterized in that a plurality of said microswitches (2) are arranged in parallel and a plurality of said pressing rods (3) are arranged in parallel.

8. Auxiliary contact of a circuit breaker according to claim 6, characterized in that the auxiliary contact body (11) is provided with a guide post (111), and the guide post (111) is located between the two pressing rods (3);

the auxiliary contact point action piece (4) is provided with a guide groove (41) matched with the guide column (111), and the guide groove (41) is positioned between the two overlapping surfaces (42).

9. Auxiliary contact for circuit breakers according to claim 6, characterized in that said auxiliary contact body (11) is provided with a first limit structure (112) and a second limit structure (113);

the first limiting structure (112) and the second limiting structure (113) are respectively positioned on the second sides of the free ends of the two pressing rods (3) and used for limiting the deformation of the free ends of the pressing rods (3).