CN214956709U

CN214956709U - Circuit breaker

Info

Publication number: CN214956709U
Application number: CN202121406486.0U
Authority: CN
Inventors: 周思雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2021-11-30
Anticipated expiration: 2031-06-23

Abstract

The utility model provides a circuit breaker, which comprises a current channel, a current channel and a power supply, wherein the current channel is used for current flowing; the release is used for controlling the on-off of the current channel; the current channel comprises a main current channel and an auxiliary current channel which are mutually connected in parallel, and at least part of the auxiliary current channel is composed of a resistance sheet which can be deformed after the current flowing through the auxiliary current channel exceeds a set value and can be used for triggering the release to act so as to break the current channel. Through the arrangement, the thermal deformation of the resistance card only corresponds to the current value flowing through the auxiliary channel of the circuit breaker, so that the resistance card can be quickly deformed and the circuit breaker can be triggered to complete thermal tripping when the current of the circuit breaker is overloaded, and the remarkable technical progress for effectively improving the precision of the circuit breaker is achieved.

Description

Circuit breaker

Technical Field

The utility model relates to a be applied to the overload protection circuit breaker that carries out thermal trip when circuit, electric load are excessive, especially relate to a can realize thermal trip, the higher circuit breaker of precision fast when electric current overloads.

Background

An air circuit breaker, commonly known as a circuit breaker and also known as an air switch, is an important electrical device in low-voltage distribution networks and electric power drive systems. A thermal trip mechanism is generally installed inside the circuit breaker to implement a thermal protection function, i.e., an overload protection function in the circuit breaker. The thermal protection function is generally implemented as follows: the current can heat the metal resistance sheet through the metal resistance sheet, the metal resistance sheet enables the size of the part to deform due to the thermal expansion effect, and then the part position of the metal resistance sheet can be changed to trigger the tripping mechanism of the circuit breaker, so that the circuit breaker is tripped.

Although the circuit breaker of the above principle can realize the function of circuit overload protection, there are many problems in practical use:

1. the problem of the heating process is as follows: the metal resistance sheet is connected with two ends of the conductive part, the metal resistance sheet through which current passes is used as a conductor, the deformation is increased along with the increase of the current when the current passes, and the overload protection function of the circuit breaker is that the circuit breaker needs to be tripped only when the current is overloaded, namely, the metal resistance sheet does not need to be thermally deformed when the current is overloaded to exceed the rated breaking current value, and the thermal deformation is needed when the current exceeds the rated breaking current value. The load current range corresponding to the deformation of the metal resistance card sold in the market at present is generally wider, and in actual use, in order to improve the control precision of the circuit breaker, the required deformation of the metal resistance card for realizing the overload protection function is smaller, so that the circuit breaker applying the existing metal resistance card is easy to trip in advance or trip by mistake.

2. The problem that the thermal deformation amount of the metal resistance card is small: the deformation of the metal resistance sheet is increased along with the increase of the current, but the deformation of the metal resistance sheet only needs to be acted during overload in practical use, the difference between the overload current value and the non-overload current value is very small in the working process of the circuit breaker, so that the deformation of the metal resistance sheet is very small, the manufacturing tolerance of the circuit breaker parts is large, the consistency of the parts after assembly cannot be guaranteed, the method for driving the touch tripping mechanism by the deformation of the metal resistance sheet is unstable, and the current solution is that a manufacturer achieves the aim by adjusting the position of the touch tripping mechanism.

3. The problems of working environment are as follows: in the existing market, manufacturers achieve the purpose of debugging the rated breaking current of the circuit breaker by adjusting the position of the touch tripping mechanism, but the difference between the environment temperature during production and the working environment temperature of the circuit breaker is large, so that the deformation of the metal resistance card is different, and meanwhile, the parameters for production adjustment are inaccurate, and error tripping is easily caused.

In combination with the existing problems, the production and debugging of the circuit breaker in the current market are difficult to realize the high-precision overload protection function and the self-applicability of the environmental temperature difference; when the production is debugged, a large amount of working hours and material cost are additionally added. Therefore, it is important to solve the above problems.

In view of the above problems, the present invention is especially provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a circuit breaker to realize the purpose of improving the overload protection precision of the circuit breaker; and simultaneously, the utility model discloses a still another aim at provides a circuit breaker to the realization is to its rated break-off current adjustable purpose.

In order to realize the purpose of the utility model, the utility model adopts the following concrete scheme:

the utility model provides a circuit breaker, which comprises a current channel, a current channel and a power supply, wherein the current channel is used for current flowing; the release is used for controlling the on-off of the current channel; the current channel comprises a main current channel and an auxiliary current channel which are mutually connected in parallel, and at least part of the auxiliary current channel is composed of a resistance sheet which can be deformed after the current flowing through the auxiliary current channel exceeds a set value and can be used for triggering the release to act so as to break the current channel.

Furthermore, one end of the resistance card is fixed, the other end of the resistance card is movably arranged, and the tripper is provided with a contact corresponding to the movable end of the resistance card; when the current value flowing in the current auxiliary channel exceeds the set value, the resistance sheet can be deformed to drive the movable end to be in contact with the contact, and the release is triggered to act to disconnect the current channel.

Furthermore, the circuit breaker is provided with a power supply input end and a power supply output end, the power supply input end is connected with the fixed contact in a break-make way through the movable contact, and the fixed contact is connected with the power supply output end through a current main channel and a current auxiliary channel which are connected in parallel; the moving contact is connected with a release, and the release can drive the moving contact to act and separate the moving contact from the fixed contact; preferably, the moving contact is of a rod-shaped structure, one end of the rod-shaped moving contact is rotatably hinged with the power input end, the other end of the rod-shaped moving contact is freely arranged and is in contact with the fixed contact, and the middle part of the rod-shaped moving contact is connected with the release through a connecting rod.

Furthermore, the fixed contact is connected with the fixed end of the resistance card, the movable end of the resistance card is connected with the input end of the current auxiliary channel through a lead, and the output end of the current auxiliary channel is connected with the power supply output end of the circuit breaker; the fixed contact is also connected with the input end of the current main channel, and the output end of the current main channel is connected with the power supply output end of the circuit breaker; preferably, the fixed contact is connected to the input of the main current path via a main resistive element.

Furthermore, the tripper comprises a tripper body which can rotate around a shaft and is arranged on the circuit breaker, any eccentric position of the tripper body is rotatably hinged with one end of a connecting rod, and the other end of the connecting rod is rotatably hinged with the middle part of a rod-shaped moving contact.

Further, the resistor disc is replaceably arranged on the current auxiliary channel; preferably, the main current path is provided with a replaceable main resistive element.

Furthermore, the resistance card is made of a composite material consisting of two conductive metals, and the two conductive metals have different thermal expansion amounts.

Compared with the prior art, the utility model has the following technical progress that is showing:

the two groups of current channels which are connected in parallel are arranged on the circuit breaker, and the resistance card which triggers the thermal trip effect of the circuit breaker is arranged on the auxiliary channel, so that the thermal deformation of the resistance card only corresponds to the current value flowing through the auxiliary channel of the circuit breaker, the resistance card can be quickly deformed when the current of the circuit breaker is overloaded, the circuit breaker is triggered to complete thermal trip, and the remarkable technical progress of effectively improving the precision of the circuit breaker is achieved. Meanwhile, through the arrangement, when the rated breaking current of the circuit breaker is adjusted, the circuit breaker can be adjusted, the rated breaking current of the circuit breaker is changed, and the working environment of the circuit breaker is adjusted only by replacing the resistor disc.

And simultaneously, the utility model discloses simple structure, the effect is showing, suitable using widely.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural diagram of a use state of a circuit breaker in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an open state of the circuit breaker according to an embodiment of the present invention;

fig. 3 is a current graph of a circuit breaker with a single current path in the prior art;

fig. 4 is a current curve diagram of a circuit breaker with dual current paths according to an embodiment of the present invention.

Description of the main elements: 1. a power supply input terminal; 2. a release; 3. a moving contact; 4. fixing a contact; 5. a contact; 6. resistance cards; 7. a wire; 8. a power supply output terminal; 9. a current main channel; 10. a current secondary channel; 11. a primary resistance member; 12. a connecting rod; 20. a release body.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes the defect management mode in the embodiments in detail with reference to the drawings in the embodiments of the present invention.

As shown in fig. 1 to 2, an embodiment of the present invention provides a circuit breaker, which includes a current channel for flowing a current; the release 2 is used for controlling the on-off of the current channel; the current channel comprises a main current channel 9 and an auxiliary current channel 10 which are mutually connected in parallel, and at least part of the auxiliary current channel 10 is composed of a resistance sheet 6 which can be deformed after the current flowing through the auxiliary current channel exceeds a set value and can be used for triggering the release 2 to act so as to break the current channel.

In the embodiment, one end of the resistance card 6 is fixed, the other end is movably arranged, and the tripper 2 is provided with a contact 5 corresponding to the movable end of the resistance card 6; when the current value flowing through the current auxiliary channel 10 exceeds a set value, the resistance sheet 6 deforms to drive the movable end to be in contact with the contact 5, and the tripper 2 is triggered to act to disconnect the whole current channel of the circuit breaker.

As shown in fig. 1 and fig. 2, in the present embodiment, the circuit breaker has a power input terminal 1 and a power output terminal 8, the power input terminal 1 is connected to the fixed contact 4 via the movable contact 3, and the fixed contact 4 is connected to the power output terminal 8 via a current main channel 9 and a current auxiliary channel 10 which are connected in parallel; the moving contact 3 is connected with the release 2, and the release 2 can drive the moving contact 3 to act and separate the moving contact 3 from the fixed contact 4.

In this embodiment, the moving contact 3 is a rod-shaped structure, one end of the rod-shaped moving contact 3 is rotatably hinged to the power input terminal 1, the other end of the rod-shaped moving contact 3 is freely arranged and is in contact with or separated from the fixed contact 4, and the middle part of the rod-shaped moving contact 3 is connected with the release 2 through a connecting rod 12.

In the embodiment, the fixed contact 4 is connected with the fixed end of the resistance card 6, the movable end of the resistance card 6 is connected with the input end of the current auxiliary channel 10 through the lead 7, and the output end of the current auxiliary channel 10 is connected with the power output end 8 of the circuit breaker; the fixed contact 4 is also connected with the input end of a main current channel 9, and the output end of the main current channel 9 is connected with the power output end 8 of the circuit breaker. Preferably, in this embodiment, the fixed contact 4 is connected to the input end of the main current channel via the main resistor 11.

In this embodiment, the cross-sectional area of the current auxiliary channel 10 is smaller than the cross-sectional area of the current main channel 9, so that the ratio of the flowing current value of the current auxiliary channel 10 to the whole current is smaller, the current borne by the resistor sheet 6 arranged on the current auxiliary channel 10 is further amplified, and the response accuracy of the circuit breaker in thermal trip is improved.

In this embodiment, the trip unit 2 includes a trip unit body 20 rotatably mounted on the circuit breaker, any eccentric position of the trip unit body 20 is rotatably hinged to one end of the connecting rod 12, and the other end of the connecting rod is rotatably hinged to the middle of the rod-shaped movable contact 3.

In this embodiment, after the resistance sheet 6 deforms and contacts with the contact 5, the trip unit body 20 of the circuit breaker can be driven by power units such as a driving motor, a spring, a torsion spring, a pressure rod, and the like to rotate around a shaft, so as to achieve the purpose of driving the moving contact 3 to move through the connecting rod 12 and disconnecting the current channel of the circuit breaker (not shown in the drawings).

In this embodiment, the resistance card 6 can be mounted on the current auxiliary channel 10 in a manner of replacing different resistance values and different models; preferably, the main current path 9 is provided with a replaceable main resistive element 11. Through the arrangement, when the rated breaking current of the circuit breaker is adjusted, the resistor disc 6 and/or the main resistor 11 can be replaced, so that the effects of adjusting the circuit breaker, changing the rated breaking current and adjusting the working environment of the circuit breaker can be achieved, the adjustment convenience is improved, and the application range of the circuit breaker is widened.

In this embodiment, the resistance card 6 is made of a composite material composed of two conductive metals, the two conductive metals have different thermal expansion amounts, and due to the different thermal expansion amounts of the two metals, the whole part of the resistance card can be deformed when current flows through the resistance card 6, and after the thermal deformation of the resistance card 6, the position of the movable end of the resistance card can be changed to trigger the trip mechanism, so that the purpose of triggering the circuit breaker to trip can be achieved. Preferably, in this embodiment, the bimetal resistance chip 6 is formed by correspondingly overlapping and laying two sheet-shaped structures, the two sheet-shaped structures are processed and compounded into an integral piece, and the two sheet-shaped structures are respectively made of different conductive metals, so that the resistance chip 6 generates bending deformation towards a fixed direction after being electrified and heated, and further, the movable end of the resistance chip 6 moves to trigger the release 2.

As shown in fig. 3, the circuit breaker on the market at present is generally a single-channel type, only one current channel is arranged in the circuit breaker, and the resistor disc is arranged on the current channel, and is used for triggering the release 2 to control the only current channel to perform the on-off action, when the circuit breaker is operated by using the resistor disc formed by the existing bimetallic disc, because the deformation zone of the bimetallic resistor disc 6 which generates heat by 2mm generally penetrates through the whole current-carrying interval of the circuit breaker, only the deformation of 0.13mm marked in the figure which actually realizes the overload protection function can be effective to the overload protection action of the circuit breaker. Therefore, the current bimetal resistance sheet 6 has an excessively long heating deformation interval, which may cause an early trip or a false trip of a single-channel circuit breaker.

As shown in fig. 4, the circuit breaker in the present application is configured as a dual channel, and the bimetal resistance sheet 6 is configured on one of the current channels, and by a reasonable distribution design of the resistances of the two current channels, the effect as shown in fig. 4 can be achieved: when the circuit breaker does not exceed the overload protection range, the current passing through the bimetallic resistor disc 6 is basically 0, and the deformation is also basically 0; when the breaker is larger than the rated breaking current, the current passing through the current main channel 9 is basically saturated, and the current passing through the current auxiliary channel 10 is rapidly increased, so that the bimetallic resistance sheet 6 is rapidly deformed, the breaker acts, the current is broken, and the circuit is protected. From fig. 3 and fig. 4, it can be seen that the current difference corresponding to the 2mm deformation of the metal resistive sheet 6 after heating is greatly different, and the deformation of the bimetal resistive sheet 6 during the change of the current value within the overload protection range is also greatly different. Therefore, the double-channel circuit breaker in this application compares with current single channel circuit breaker, has that overload protection reaction is timely, indelible touch etc. and shows technological progress.

In this embodiment, the specific implementation of the circuit breaker is as follows:

as shown in fig. 1, when the circuit breaker is in a normal operating state, a current enters the circuit breaker through a power input end 1, and the current is transmitted into two current channels at the rear end through a switch contact formed by a moving contact 3 and a fixed contact 4, wherein the two current channels are a current main channel 9 and a current auxiliary channel 10 respectively; the current main channel 9 and the current auxiliary channel 10 respectively through the device of design after the power output end 8 of the income circuit breaker and output current (of course, can also change the current direction for the circuit breaker returns to the transmission of electricity, the utility model discloses be applicable to here again repeatedly not discussing equally). The design of the current cross sections of the current main channel 9 and the current auxiliary channel 10 can be changed according to different requirements, and the current cross sections are distributed to the current main channel 9 and the current auxiliary channel 10 according to the total current consumption, and the total conductive cross sections and the current cross sections of the current main channel 9 and the current auxiliary channel 10 are distributed according to the design requirements, for example, the current cross section of the current main channel 9 accounts for 70% of the total conductive cross section, and the current cross section of the current auxiliary channel 10 accounts for 30% of the total conductive cross section. Meanwhile, a resistance sheet composed of a resistance type bimetallic strip (2 conductive metal composite materials, the heat expansion amount of two conductive metals is different, after the resistance sheet is electrified, the heat is generated according to the current amount, and the composite material after the heat generation can be bent and deformed) is arranged in the current auxiliary channel 10, one end of the resistance sheet is connected to the front end of the current main channel 9 and is fixed with the fixed contact 4, the other end of the resistance sheet is connected to the rear end of the current main channel 9 through a lead 7 (composed of a flexible lead capable of generating bending deformation), and the resistance type bimetallic strip has a rated resistance value (can be replaced into different models according to requirements). When the circuit breaker passes through current, the current respectively passes through the current main channel 9 and the current auxiliary channel 10 and then simultaneously flows into the power output end 8 at the rear end for output, but because the cross section of the current auxiliary channel 10 is small and the resistance sheet 6 on the current auxiliary channel has a certain resistance value, the resistance value of the current main channel 9 is smaller than that of the current auxiliary channel 10, and most of the current flowing in the circuit breaker can be discharged through the current main channel 9.

As shown in fig. 2, when the load current amount of the circuit breaker exceeds the rated value of the current main channel 9, a large resistance value is generated, and the resistance value of the current main channel 9 at this time exceeds the resistance value of the current auxiliary channel 10, so that the current amount flowing through the current auxiliary channel 10 increases, and the resistance sheet 6 in the current auxiliary channel 10 is rapidly heated and deformed to be in contact with the contact 5 of the trip 2, so as to trigger the trip body 20 to rotate and then disconnect the movable contact 3 and the fixed contact 4, thereby realizing the effect of disconnecting the energizing circuit of the circuit breaker. The principle obtains two different resistance values of the electricity, namely the resistance value of the conductive section and the resistance value of the conductive material, and the current flow channel distribution and the channel resistance value control can be realized by utilizing different resistance value positions and resistance value generation states. Therefore, the resistance sheet formed by the resistance type bimetallic strip can not generate heat or generate less heat and deform when the breaker passes through a small current amount; when the current flowing through the circuit breaker reaches or exceeds the rated breaking current, the resistance sheet 6 consisting of the resistance type bimetallic strip is quickly heated and deformed.

As shown in fig. 1 and 2, in the present embodiment, when the current flowing through the current sub-channel 10 is smaller than the rated off-current, the current flowing through the resistive sheet 6 formed of the resistive bimetallic strip is substantially 0, and the deformation amount thereof is also 0; when the current flowing through the circuit breaker reaches the overload protection current, namely the rated breaking current, the current passing through the current main channel 9 is basically saturated, and the current passing through the current auxiliary channel 10 is rapidly increased, so that the resistance type bimetallic strip 6 is rapidly deformed, the release 2 is triggered, and the moving contact 3 and the fixed contact 4 are timely disconnected, thereby achieving the purpose of effectively protecting the circuit.

In this embodiment, an adjusting method applied to the circuit breaker is further described, and when the rated breaking current of the circuit breaker needs to be adjusted, the resistor disc 6 with the corresponding resistance value is replaced.

In the embodiment, in order to make the circuit breaker of the utility model more widely applied to various products and environments, a main resistance member 11 can be additionally arranged in the current main channel 9 of the circuit breaker; of course, the resistance of the material used for the main current channel 9 is changed according to the design requirements of the product, which can also achieve the purpose of adjusting the application environment of the circuit breaker. Therefore, in this embodiment, the method for adjusting the circuit breaker further includes, when the rated breaking current of the circuit breaker needs to be adjusted, replacing the main resistor 11 provided on the main current channel 9 of the circuit breaker with a corresponding set resistance value.

In this embodiment, the time required for heating deformation of the resistor can be adjusted by using the resistance and the proportion of the materials of the current main channel 9 and the current auxiliary channel 10, so as to achieve the purpose of adjusting the rated breaking current value of the circuit breaker. Therefore, in this embodiment, the method for adjusting the circuit breaker further includes adjusting the ratio of the current-carrying cross sections of the main current channel 9 and the auxiliary current channel 10 of the circuit breaker when the rated breaking current of the circuit breaker needs to be adjusted.

In the embodiment of the utility model, through the accurate distribution of the current shunt in the circuit breaker, the combined action of resistance section resistance and material resistance design in two current branches to realize the result of deformation of the heating value and the heating rate of the resistance type bimetallic strip, so that the shadow of the circuit breaker formed by the bimetallic resistor strip of the design can be ignored to factors such as altitude, environment, season temperature, etc.; therefore, the problem that the adjusting screw is used for avoiding influencing the adjusting mode of the circuit breaker of the deformation angle of the resistance chip can be thoroughly solved, and the space layout for installing the adjusting screw and the labor cost for production debugging are reduced; meanwhile, the stability and consistency of a thermal tripping mechanism of the circuit breaker are obviously improved; and the rated breaking current of the circuit breaker can be adjusted, so that the adaptive working environment is expanded.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention still fall within the scope of the present invention.

Claims

1. A circuit breaker, which comprises a circuit breaker body,

a current channel for flowing a current;

the release is used for controlling the on-off of the current channel;

the method is characterized in that:

the current channel comprises a main current channel and an auxiliary current channel which are mutually connected in parallel, and at least part of the auxiliary current channel is composed of a resistance sheet which can be deformed after the current flowing through the auxiliary current channel exceeds a set value and can be used for triggering the release to act so as to break the current channel.

2. The circuit breaker of claim 1, wherein one end of the resistor disc is fixed, and the other end is movably arranged, and the release is provided with a contact corresponding to the movable end of the resistor disc;

when the current value flowing in the current auxiliary channel exceeds the set value, the resistance sheet can be deformed to drive the movable end to be in contact with the contact, and the release is triggered to act to disconnect the current channel.

3. The circuit breaker of claim 2, wherein the circuit breaker has a power input terminal and a power output terminal, the power input terminal is connected to the fixed contact via the movable contact, and the fixed contact is connected to the power output terminal via a main current channel and an auxiliary current channel connected in parallel;

the moving contact is connected with the release, and the release can drive the moving contact to act and separate the moving contact from the fixed contact.

4. The circuit breaker of claim 3, wherein the movable contact is a rod-shaped structure, one end of the rod-shaped movable contact is rotatably hinged to the power input end, the other end of the rod-shaped movable contact is freely arranged and is in contact with the fixed contact, and the middle part of the rod-shaped movable contact is connected with the release through a connecting rod.

5. The circuit breaker of claim 3, wherein the fixed contact is connected with a fixed end of the resistor disc, a movable end of the resistor disc is connected with an input end of the current auxiliary channel through a lead, and an output end of the current auxiliary channel is connected with a power supply output end of the circuit breaker;

the fixed contact is also connected with the input end of the current main channel, and the output end of the current main channel is connected with the power output end of the circuit breaker.

6. A circuit breaker according to claim 5 in which the fixed contact is connected to the input of the main current path via the primary resistive element.

7. The circuit breaker of claim 3, wherein the trip unit comprises a trip unit body pivotally mounted to the circuit breaker, wherein any off-center position of the trip unit body is pivotally connected to one end of the link, and the other end of the link is pivotally connected to a middle portion of the rod-shaped movable contact.

8. A circuit breaker according to any one of claims 1 to 7 wherein the resistive patches are replaceably mounted to the current secondary channels.

9. A circuit breaker according to claim 8 wherein the primary current path is provided with a replaceable primary resistive element.

10. The circuit breaker according to any one of claims 1 to 7, wherein said resistive sheet is formed of a composite material of two conductive metals having different thermal expansion amounts.