CN219832540U - Thermal tripping structure and circuit breaker - Google Patents

Abstract

The utility model discloses a thermal tripping structure, which comprises: the bimetal strip and the limiting part are used for connecting the path when the bimetal strip is positioned at the initial position and limiting by the limiting part; the first end of the elastic piece is abutted against the bimetallic strip, and when the bimetallic strip is positioned at the initial position, the elastic piece is in a compressed state and is pressed to the limiting part by the force of the first elastic value; when the current value passing through the bimetallic strip is increased to the design current, the bimetallic strip deforms and applies a force of a first elastic value to the elastic piece. The utility model uses the bimetallic strip with the same brand to manufacture the thermal tripping structure, and the initial position of the bimetallic strip is kept consistent by the limiting part, meanwhile, the overload control of the thermal bimetal is carried out by the elastic piece, so that the thermal bimetal starts to push the elastic piece to perform tripping action when the design current flows, and the production error and the cost of the thermal tripping structure are reduced. The utility model also provides a circuit breaker comprising the thermal tripping structure.

Description

Thermal tripping structure and circuit breaker

Technical Field

The utility model relates to the technical field of circuit breaker equipment, in particular to a thermal tripping structure and a circuit breaker.

Background

The circuit breaker is an important switch device in a power system, and is often connected into a circuit to protect an electric device, particularly when the circuit breaker is connected into the circuit and the problem of current overload occurs in the circuit, a thermal tripping structure in the circuit breaker can perform tripping action to disconnect the circuit, so that the electric device is prevented from being damaged by overload current.

The thermal tripping structure in the existing circuit breaker generally comprises a bimetallic strip, the difference of expansion coefficients of an active layer and a passive layer in the bimetallic strip is utilized, so that when the circuit current connected with the bimetallic strip is overloaded, the deformation of the active layer is larger than the deformation of the passive layer, the whole of the bimetallic strip is bent to one side of the passive layer to realize the disconnection of the circuit, but the existing circuit breaker is often required to meet the thermal tripping performance requirements under different current intensities, especially in a small circuit breaker, the internal installation space is extremely limited, but still needs to meet the thermal tripping requirements under different current intensities, bimetallic strips with different brands are used in the production process, the initial positions of the bimetallic strips with different brands are regulated, the problems of the use errors of the brands and the position regulation deviation of the bimetallic strips are very easy to occur in the production process, the problem that the one-time passing rate of the subsequent thermal regulation is influenced, and a certain quality risk exists on the inflow client side, and meanwhile, the bimetallic strips with different brands can lead to high material storage and transportation process cost and influence the production efficiency.

Therefore, how to reduce the production error and the production cost of the trip structure meeting the trip requirements under different current intensities is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

Therefore, the present utility model is directed to a thermal trip structure to meet the trip requirements under different current intensities and reduce the production errors and the production cost.

Another object of the present utility model is to provide a circuit breaker including the thermal trip structure described above.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a thermal trip structure comprising:

the bimetal blade is in a passage when being positioned at an initial position, and is limited by the limiting part when being positioned at the initial position;

the first end of the elastic piece is abutted against the bimetallic strip, the first end is a movable end part, and when the bimetallic strip is positioned at the initial position, the elastic piece is in a compressed state and is pressed to the limiting part by the acting force of a first elastic value;

when the current value passing through the bimetallic strip is increased to the designed current, the bimetallic strip deforms far away from the limiting part and applies a compression force with a first elastic value to the elastic piece.

Preferably, in the above thermal trip structure, the elastic pieces of several specifications are distinguished by different colors or digital marks, and the bimetal is adapted to the elastic pieces of several specifications.

Preferably, in the above thermal trip structure, the elastic member is a torsion spring, the torsion spring is sleeved on the fixing portion, a first end pin of the torsion spring abuts against the bimetal, a second end pin abuts against the limiting boss, and a second end of the torsion spring is kept fixed in position in the deformation process of the bimetal.

Preferably, in the above thermal trip structure, the limiting boss has a two-stage structure and clamps a second end pin for limiting the torsion spring.

Preferably, in the above thermal tripping structure, the fixing portion is a cylindrical protrusion, and an inner diameter of the torsion spring is in contact nested fit with an outer diameter of the fixing portion.

Preferably, in the above thermal trip structure, the elastic member is a spring piece sleeved on the outer periphery of the fixing portion, a movable end of the spring piece abuts against the bimetal, and the fixing end is fixedly arranged on the fixing portion.

Preferably, in the above thermal trip structure, when the current value passing through the bimetal is greater than the design current, the force of the bimetal on the elastic member is greater than the first elastic value so as to compress the elastic member and pull the trip retractor.

Preferably, in the above thermal trip structure, an outer surface of the elastic member is coated with an insulating coating.

The circuit breaker comprises a plurality of thermal tripping structures, and is characterized in that the thermal tripping structures are provided by any embodiment.

Preferably, in the circuit breaker, the bimetallic strips in the plurality of thermal tripping structures are bimetallic strips with the same brand.

According to the technical scheme, the thermal tripping structure comprises bimetallic strips, limiting parts and elastic pieces, wherein the bimetallic strips are used for executing tripping action when current is overloaded in a circuit connected with the thermal tripping structure so as to protect the circuit and an electric device, the bimetallic strips are provided with initial positions, are in a state of being connected with the circuit when being positioned at the initial positions, meanwhile, the bimetallic strips are limited by the limiting parts when being positioned at the initial positions so as to ensure that the initial positions of the bimetallic strips in each thermal tripping structure are the same when a plurality of circuit breakers comprising the thermal tripping structure are produced, the bimetallic strips are bimetallic strips with the same brand, so that the bimetallic strips are consistent in the processes of storing, transferring and assembling, the elastic pieces are arranged at the periphery of the bimetallic strips, and the first ends of the elastic pieces are abutted against the bimetallic strips, and the description needs to be given here, the first end of the elastic piece is a movable end part, when the bimetallic strip is positioned at the initial position, the elastic piece is in a compressed state, the elastic piece applies a first elastic value acting force to the bimetallic strip through the first end so as to compress the elastic piece to the limiting part, so that the bimetallic strip is kept in a stable state at the initial position, a circuit which is connected with the bimetallic strip is in a normal communication state, when the current value of the bimetallic strip in the circuit connected with the bimetallic strip reaches a design current, deformation in the direction away from the limiting part is generated, and the bimetallic strip applies a first elastic value compressing force to the elastic piece, and the design current, namely, the limit current of the safe use of an electric device in the circuit, is required to be designed by a designer according to the use scene of the thermal tripping structure provided by the utility model, when the current in the circuit reaches the design current and is further increased, the compression force of the bimetallic strip on the elastic piece is larger than the first elastic value, so that the bimetallic strip pushes the elastic piece to deform or displace, and the contactor displaces to execute tripping action. According to the thermal tripping structure provided by the utility model, the marks of the bimetallic strip are subjected to unified treatment, so that the classification types of the bimetallic strip materials are reduced in the process of producing the batch thermal tripping structure, the storage and production cost of the bimetallic strip materials are reduced, meanwhile, the assembly positions of the bimetallic strip are unified through the limiting part, the bimetallic strip can be conveniently and rapidly determined by a producer when the bimetallic strip is assembled, in addition, the bimetallic strip is stably pressed to the initial position when the bimetallic strip runs through a passage by arranging the elastic part, and when the bimetallic strip is fed with current to reach the design current, the acting force generated by deformation of the bimetallic strip is counteracted with the compression force of the elastic part, so that the bimetallic strip can deform and displace to execute the tripping action when the current value of the bimetallic strip is larger than the design current, and the thermal tripping structure provided by the utility model can meet the tripping requirements under different current intensities by using the elastic parts with different elastic moduli.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a thermal trip structure when a bimetal is located at an initial position according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a thermal trip structure when a bimetal is located at a trip position according to an embodiment of the present utility model;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a schematic diagram of a thermal trip structure according to another embodiment of the present utility model;

wherein 10 is bimetallic strip, 20 is spacing portion, 310 is torsion spring, 320 is shell fragment, 40 is fixed portion, 50 is spacing boss.

Detailed Description

The core of the utility model is to disclose a thermal tripping structure to meet tripping requirements under different current intensities and reduce production errors and production cost.

Another object of the present utility model is to provide a circuit breaker including the thermal trip structure described above.

In order to better understand the solution of the present utility model, the following description of the embodiments of the present utility model refers to the accompanying drawings. Furthermore, the embodiments shown below do not limit the summary of the utility model described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the utility model described in the claims.

As shown in fig. 1, 2 and 3, the thermal trip structure provided by the embodiment of the present utility model includes a bimetal 10, a limiting portion 20 and an elastic member, wherein the bimetal 10 is used for performing a trip action when a current is overloaded in a circuit to which the bimetal 10 is connected, so as to protect the circuit and an electric device, the bimetal 10 has an initial position, which is in a state of being connected to the circuit when being located at the initial position, and simultaneously, the bimetal 10 is limited by the limiting portion 20 when being located at the initial position, so as to ensure that the initial positions of the bimetal 10 in each thermal trip structure are the same when a plurality of circuit breakers including the thermal trip structure are produced, and the bimetal 10 provided by the embodiment of the present utility model is the same number of the bimetal 10, so that the bimetal 10 keeps consistent in the processes of storing and transferring, and assembling, the elastic piece is disposed at the periphery of the bimetal 10, and the first end of the elastic piece abuts against the bimetal 10, where it is to be noted that the first end of the elastic piece is a movable end, and when the bimetal 10 is located at the initial position, the elastic piece is in a compressed state, where the compressed state refers to the elastic piece being in a force storage state, at this time, the elastic piece applies a force of a first elastic value to the bimetal 10 through the first end to compress the elastic piece to the limiting portion 20 so as to keep the bimetal 10 in a stable state at the initial position, at this time, a circuit to which the bimetal 10 is connected is in a normal connection state, and when a current value of the bimetal 10 in the connection circuit reaches a designed current, deformation in a direction away from the limiting portion 20 is generated, and at this time, the bimetal 10 applies a compression force of the first elastic value to the elastic piece.

It should be noted that, when the design current, i.e. the limit current for safely using the electrical device in the circuit, is designed by the designer according to the usage scenario of the thermal trip structure provided by the embodiment of the present utility model, and when the current in the circuit reaches the design current and further increases, the magnitude of the compression force of the bimetal 10 on the elastic element will be greater than the first elastic force value, so that the bimetal 10 pushes the elastic element to deform or displace, and the contactor displaces itself to execute the trip action.

According to the thermal tripping structure provided by the embodiment of the utility model, the marks of the bimetallic strip 10 are subjected to unified treatment, so that the classification types of materials of the bimetallic strip 10 are reduced in the process of producing the batch thermal tripping structure, and therefore, the storage and production cost of the bimetallic strip 10 is reduced, meanwhile, the assembly positions of the bimetallic strip 10 are unified through the limiting part 20, and a producer can conveniently and rapidly determine the positions of the bimetallic strip 10 when assembling the bimetallic strip 10, in addition, the elastic part is arranged to stably press the bimetallic strip 10 to the initial positions when the passageway is running, and when the bimetallic strip 10 is electrified to reach the design current, the acting force generated by deformation of the bimetallic strip 10 is counteracted with the compression force of the elastic part, so that the bimetallic strip 10 can deform and displace to execute the tripping action when the current value of the bimetallic strip 10 is larger than the design current, and the thermal tripping structure provided by the embodiment of the utility model can meet the tripping requirements under different current intensities by using the elastic parts with different elastic moduli.

It should be noted that, by arranging the elastic member, the thermal trip structure provided by the embodiment of the utility model can unify the brand difference of the bimetallic strip 10 and the initial installation position of the bimetallic strip 10, and the model difference of the thermal trip structure is realized by the elastic member, and compared with the bimetallic strip 10, the elastic member has low manufacturing cost, convenient processing and purchasing, easy differentiated distinction, small assembly error and reduced reworking proportion and possible quality risk of flowing into a client.

Further, since the model difference of the elastic pieces is the only difference in the production process of the batch heat release structure, in order to reduce assembly errors, the first pass rate of the heat release structure during subsequent heat adjustment is improved.

Further, as shown in fig. 2 and 3, in an embodiment of the present utility model, the elastic member is a common torsion spring 310, which has a good torsion deformation effect, and is easy to produce or purchase in various types, the torsion spring 310 is sleeved on a fixing portion 40, and a first end pin of the torsion spring 310 abuts against the bimetal 10, so as to compress the bimetal 10 to the limiting portion 20 when the bimetal 10 is located at an initial position through the first end pin, meanwhile, in order to maintain a stable posture of the torsion spring 310, a second end pin of the torsion spring 310 abuts against a limiting boss 50, the limiting boss 50 is usually fixedly arranged on a side wall of the circuit breaker, and a second end pin of the torsion spring 310 maintains a stable position during deformation and displacement of the bimetal 10.

On the basis of the above embodiment, in order to further raise the second end pin of the torsion spring 310 to remain stable during the operation of the bimetal 10, the limiting boss 50 is designed to have a two-stage structure, and the distance between the two stages of limiting bosses 50 is equal to the diameter of the second end pin of the torsion spring 310, and the second end pin of the torsion spring 310 is clamped between the two stages of limiting bosses 50 to remain stable.

In order to further optimize the above technical solution, in the thermal trip structure provided in the embodiment of the present utility model, the fixing portion 40 is a protrusion with a cylindrical configuration, and the outer diameter dimension of the fixing portion 40 and the inner diameter dimension of the torsion spring 310 are preferably in a just nested fit, that is, the inner diameter of the torsion spring 310 contacts with the outer diameter of the fixing portion 40, and at the same time, the torsion spring 310 is guaranteed to rotate, so that the torsion spring 310 is stably nested and arranged on the outer periphery of the fixing portion 40, and the torsion spring 310 is prevented from falling off from the fixing portion 40 in the action process of the bimetallic strip 10.

Further, as shown in fig. 4, in another embodiment of the present utility model, the elastic member is a spring piece 320 wound on a fixing portion 40, and a movable end of the spring piece 320 abuts against the bimetal 10 to compress the bimetal 10 to the limiting portion 20 when the bimetal 10 is located at the initial position, and a fixed end of the spring piece 320 is fixedly disposed on the fixing portion 40 to keep the stable connection between the spring piece 320 and the fixing portion 40.

Further, in the above embodiment, the tripping operation process of the thermal tripping structure is that when the current in the circuit connected by the thermal tripping structure reaches the design current, that is, reaches the limit current for safe use of the electrical device in the circuit, the effect of the deformation of the bimetal 10 on the compression force generated by the elastic element and the first elastic force value generated by the elastic element on the bimetal 10 are counteracted, and when the current value passing through the circuit is greater than the design current, the compression force generated by the bimetal 10 on the elastic element is greater than the first elastic force value, so that the elastic element is pushed by the bimetal 10 in the direction away from the limiting portion 20, and the tripping drag hook can be driven to move to execute the tripping action by the displacement generated by the bimetal 10.

In order to avoid short circuit and abrupt current change of the bimetal 10, in the thermal trip structure provided by the embodiment of the utility model, the surface of the elastic element which is always in contact with the bimetal 10 is coated with an insulating coating.

The embodiment of the utility model also provides a circuit breaker which comprises a plurality of thermal tripping structures, wherein the thermal tripping structures are provided by any one of the embodiments.

Further, in the circuit breaker provided by the embodiment of the utility model, the bimetallic strips in the plurality of thermal tripping structures are bimetallic strips with the same brand, and the thermal tripping structures applied to different current working conditions are applied to corresponding scenes by using elastic pieces with different specifications.

The terms first, second, left and right in the description and the claims of the present utility model and in the above-described drawings, etc. are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. 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 utility model. Thus, the present utility model 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 (10)

1. A thermal trip structure, comprising:

a bimetal (10) and a limiting part (20), wherein the bimetal (10) is in a passage when in an initial position, and is limited by the limiting part (20) when in the initial position;

the first end of the elastic piece is abutted against the bimetallic strip (10), the first end is a movable end, and when the bimetallic strip (10) is located at the initial position, the elastic piece is in a compressed state and is pressed to the limiting part (20) by acting force with a first elastic value;

when the current value passing through the bimetallic strip (10) is increased to the design current, the bimetallic strip (10) deforms far away from the limiting part (20) and applies a compression force with a first elastic value to the elastic piece.

2. The thermal trip structure according to claim 1, characterized in that said elastic elements of several gauges are differentiated by different colours or numerical identifiers, said bimetallic strip (10) being adapted to said elastic elements of several gauges.

3. The thermal trip structure according to claim 1, wherein the elastic member is a torsion spring (310), the torsion spring (310) is sleeved on the fixing portion (40), a first end pin of the torsion spring (310) abuts against the bimetal (10), a second end pin abuts against the limit boss (50), and a second end of the torsion spring (310) is kept fixed in position in the deformation process of the bimetal (10).

4. The thermal trip structure of claim 3, wherein said limit boss (50) is a two-stage structure and sandwiches a second end pin of said torsion spring (310).

5. The thermal trip structure of claim 3, wherein said fixed portion (40) is a cylindrical protrusion, and wherein an inner diameter of said torsion spring (310) is in contact nesting fit with an outer diameter of said fixed portion (40).

6. The thermal trip structure according to claim 1, wherein the elastic member is a spring piece (320) sleeved on the periphery of the fixing portion (40), the movable end of the spring piece (320) abuts against the bimetal (10), and the fixing end is fixedly arranged on the fixing portion (40).

7. The thermal trip structure according to claim 1, wherein when the current value passing through said bimetal (10) is greater than said design current, the force of said bimetal (10) on said elastic member is greater than said first elastic value to compress said elastic member and pull the trip retractor.

8. The thermal trip structure of claim 1, wherein an exterior surface of said resilient member is coated with an insulating coating.

9. A circuit breaker comprising a number of thermal trip structures, wherein the thermal trip structures are as claimed in any one of claims 1 to 8.

10. Circuit breaker according to claim 9, characterized in that the bimetal strips (10) of several of the thermal trip structures are bimetal strips (10) of the same brand.