CN213752578U - Circuit breaker - Google Patents

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. Including the current transformer that equals with the looks number of circuit breaker and equal and the electrically conductive row that runs through current transformer with current transformer's quantity, characteristics are: the current transformers are arranged from left to right in a longitudinal state, and the conducting bars are longitudinally arranged when penetrating through the current transformers. The advantages are that: because the current transformers are longitudinally arranged from left to right and the conducting bars are longitudinally arranged, the size of the base of the circuit breaker in the width direction can be effectively shortened, the space layout is more reasonable, the development trend of the switch electric appliance to the miniaturization direction can be met, and the temperature rise problem can be avoided.

Description

Circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to circuit breaker.

Background

The above-mentioned circuit breaker is mainly, but not absolutely limited to, an electronic residual current molded case circuit breaker. As known in the art, an electronic leakage circuit breaker belongs to the category of electronic leakage molded case circuit breakers, and mainly comprises a current transformer, a zero sequence current transformer, a main loop conductive loop bar, an electronic release, a leakage release, an overload and short-circuit protection device, and the like. When the leakage current reaches the designed and selected action current value, the secondary winding of the zero sequence current transformer outputs a signal, and the circuit breaker is actuated through the leakage release, for example, the circuit breaker operating mechanism is actuated, so that the power supply is cut off to play the roles of leakage and electric shock protection.

The zero sequence power transformer has the functions of detecting the vector sum of each phase current, detecting a leakage signal and enabling the leakage magnetic flux converter to instantaneously or delay to act when the set leakage current is met, so that a traction rod of a structural system of the operating mechanism is struck, the tripping mechanism acts and a fault circuit is cut off.

The current transformer penetrates through each phase row to detect a single-phase loop, and a circuit board acquires, detects and judges signals, and finally sends signals whether action is needed or not to the electronic magnetic flux converter. Since the phase distance of the circuit breaker is basically constant (the width of the miniaturized circuit breaker is constant), in order to facilitate the current transformer to pass through the horizontal row, and the width of the current transformer is slightly wider than that of the conductive row, the geometric shape of the current transformer is designed into a square structure and is installed on the base in a horizontal state, for which, reference is made to "a circuit breaker with electronic protection and electric leakage protection" recommended by CN 204270999U. Although the horizontal installation, namely the horizontal installation of the current transformer is beneficial to the horizontal arrangement of the current transformer, the occupied space is relatively large, the horizontal installation is not suitable for the miniaturization development trend of the circuit breaker serving as the switching apparatus, and the miniaturization of the volume is not only an objective requirement on the circuit breaker, but also an inevitable trend which cannot be avoided. However, there is a contradiction between the miniaturization of the circuit breaker volume and the temperature rise (i.e. the working temperature rise) which is difficult to reconcile, and in particular, if only the miniaturization of the circuit breaker is considered and the temperature rise is wasted, the circuit breaker will certainly affect the manifestation of the due function of the circuit breaker and even the service life of the circuit breaker, so how to find a reasonable balance between the two is a technical problem which is expected to be solved by the industry, and the technical solution to be described below is generated under such a background.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a help shortening the size of base on the width direction when guaranteeing compact structure effectively to make spatial layout more reasonable and can satisfy both can ensure the miniaturization and can avoid the circuit breaker of temperature rise problem again.

The utility model discloses a task is accomplished like this, a circuit breaker, include the current transformer that equals with the phase number of circuit breaker and equal and run through current transformer's electrically conductive row with current transformer's quantity, characteristics are: the current transformers are arranged from left to right in a longitudinal state, and the conducting bars are longitudinally arranged when penetrating through the current transformers.

In a specific embodiment of the present invention, the circuit breaker further comprises a zero sequence current transformer, the current transformer and the zero sequence current transformer are arranged close to each other in front of and behind each other, and the conducting bar sequentially passes through the current transformer and the zero sequence current transformer.

In another specific embodiment of the present invention, the circuit breaker further includes a base, on which a zero sequence current transformer limiting groove is disposed, and a current transformer limiting groove equal to the current transformer in quantity is disposed, the zero sequence current transformer is disposed on the base at a position corresponding to the zero sequence current transformer limiting groove, and the current transformer is disposed on the base at a position corresponding to the current transformer limiting groove.

In another specific embodiment of the present invention, the circuit breaker further includes a housing, and the housing is matched with the base in a state of covering the current transformer.

In another specific embodiment of the present invention, a first conductive line limiting groove i is formed on the base, and a second conductive line limiting groove ii is formed on the housing, the second conductive line limiting groove ii corresponds to the first conductive line limiting groove i, and the conductive line is positioned between the base and the housing at a position corresponding to a position between the first conductive line limiting groove i and the second conductive line limiting groove ii.

In yet another specific embodiment of the present invention, the conducting bar comprises a conducting bar in phase a, a conducting bar in phase B, a conducting bar in phase C and a conducting bar in phase N, wherein the conducting bar in phase B and the conducting bar in phase C are located between the conducting bar in phase a and the conducting bar in phase N, a zero sequence current transformer through hole penetrating from one side of the zero sequence current transformer to the other side is formed at the central position of the zero sequence current transformer, the conducting bar in phase a and the conducting bar in phase N pass through the zero sequence current transformer through hole and respectively form a U-shape, the conducting bar in phase B and the conducting bar in phase C pass through the zero sequence current transformer through hole and respectively form a U-shape at the position corresponding to the lower position of the conducting bar in phase a and the conducting bar in phase N respectively.

In a more specific embodiment of the present invention, the zero sequence current transformer through hole is a circular hole.

In yet another specific embodiment of the present invention, the opening directions of the U-shapes of the a-phase conductive bar and the N-phase conductive bar are opposite to each other; the opening directions of the U-shapes of the B-phase conductive row and the C-phase conductive row are opposite to each other.

In a still more specific embodiment of the present invention, the directions of the openings of the U-shapes of the phase a conductive bar and the phase B conductive bar are the same; the directions of the U-shaped openings of the N-phase conductive row and the C-phase conductive row are the same.

The technical scheme provided by the utility model the technical effect lie in: because the current transformers are longitudinally arranged from left to right and the conducting bars are longitudinally arranged, the size of the base of the circuit breaker in the width direction can be effectively shortened, the space layout is more reasonable, the development trend of the switch electric appliance to the miniaturization direction can be met, and the temperature rise problem can be avoided.

Drawings

Fig. 1 is a schematic diagram of the circuit breaker of the present invention.

Fig. 2 is a structural diagram of an electronic leakage release module of the circuit breaker shown in fig. 1.

Fig. 3 is a schematic view of fig. 2 viewed from the side.

Fig. 4 is a schematic view of the conductive bar of fig. 2 defined between a base and a cover.

Fig. 5 is an exploded perspective view of fig. 4.

Fig. 6 is a detailed structural view of the base shown in fig. 2 to 5.

Fig. 7 is a detailed structural view of the cover shown in fig. 2 to 5.

Detailed Description

In order to make the technical essence and advantages of the present invention more clear, the applicant below describes in detail the embodiments, but the description of the embodiments is not a limitation of the present invention, and any equivalent changes made according to the inventive concept, which are only formal and not essential, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations such as up, down, front, rear, left and right are exemplified by the position state of fig. 1, and thus, it should not be understood as a particular limitation to the technical solution provided by the present invention.

Referring to fig. 1, it can be seen from the circuit breaker shown in fig. 1 that: the circuit breaker exemplified in this embodiment is an electronic leakage molded case circuit breaker of a phase, a phase and an N phase in order from left to right, and the electronic leakage molded case circuit breaker includes a base 1 and a main circuit unit disposed in the base 1. As shown in fig. 1, the main circuit unit is sequentially provided with an incoming line terminal 2 (i.e., a fixed contact), a contact arc extinguishing module 3 connected to the incoming line terminal 2, an electronic leakage release module 4 connected to the contact arc extinguishing module 3, and an outgoing line terminal 5 connected to the electronic leakage release module 4 from front to back along the length direction of the base 1.

Referring to fig. 2 to 3, the contact arc extinguishing module 3 includes a movable contact 31 cooperating with a stationary contact. Defining: the direction from the incoming line terminal 2 to the outgoing line terminal 5 of the electronic residual current plastic shell circuit breaker is the front-back direction; the direction from the a phase to the N phase of the electronic earth leakage molded case circuit breaker is the left-right direction (also horizontal direction). The thickness direction of the base 1 of the electronic residual current plastic case circuit breaker is a vertical direction (may also be called "longitudinal direction").

Continuing to refer to fig. 2 to fig. 3, the electronic leakage trip unit 4 disposed inside the circuit breaker includes a base 41, an overcurrent detecting assembly 42 and a leakage detecting assembly 43 both disposed on the base 41, and a conducting bar 44, where the overcurrent detecting assembly 42 includes a plurality of current transformers 421, and the conducting bar 44 respectively penetrates through the corresponding current transformers 421; the leakage detecting assembly 43 includes a zero-sequence current transformer 431, and the conductive bar 44 penetrates through the zero-sequence current transformer 431. The aforementioned plurality of current transformers 421 are vertically arranged (may also be referred to as "longitudinal arrangement") in sequence from left to right in the a-phase, B-phase, C-phase, and N-phase of the base 1, and are arranged in close proximity to the aforementioned and zero sequence current transformers 431 in front and rear. The aforementioned zero sequence current transformer 431 is disposed between the current transformer 421 and the outlet terminal 5, the aforementioned conducting bar 44 is connected to the outlet terminal 5, and the other end of the conducting bar penetrates through the zero sequence current transformer 431 and each phase current transformer 421 to be connected to the moving contacts 31 one by one. That is, the conductive bar 44 is connected to the incoming terminal 2 and the outgoing terminal 5 in a one-to-one correspondence to form a main circuit.

As shown in fig. 2, the conductive row 44 includes two side conductive rows and a middle conductive row, in this embodiment, the side conductive rows of the conductive row 44 are an a-phase conductive row 441 and an N-phase conductive row 444, and the middle conductive row of the conductive row 44 is a B-phase conductive row 442 and a C-phase conductive row 443. The zero-sequence current transformer 431 is circular in outline, and a circular zero-sequence current transformer through hole 4311 is provided in the center of the zero-sequence current transformer 431. The phase a conducting bar 441, the phase B conducting bar 442, the phase C conducting bar 443, and the phase N conducting bar 444 pass through the zero sequence current transformer through hole 4311, both ends of the zero sequence current transformer are located at the front and rear sides of the zero sequence current transformer 431, one end of the zero sequence current transformer is connected to the outgoing line terminal 5, and the other end of the zero sequence current transformer passes through the current transformer 421 and is connected to the moving contact 31. The aforementioned a-phase conductive bar 441 and N-phase conductive bar 444 have the same shape and structure, are disposed in a symmetrical state, and penetrate through the upper one of the zero-sequence current transformer through holes 4311, for example, above the zero-sequence current transformer through hole 4311 in fig. 2. In this embodiment, the phase a conductive bar 441 and the phase N conductive bar 444 are both U-shaped. The aforementioned B-phase conductive bar 442 and C-phase conductive bar 443 are also identical in shape and structure, are disposed in a symmetrical state, and pass through the other one of the zero-sequence current transformer through holes 4311, which is disposed below the zero-sequence current transformer through hole 4311, for example, as shown in fig. 2. In this embodiment, the conductive row 442 of phase B and the conductive row 443 of phase C are both U-shaped.

Referring to fig. 4 to 7, a plurality of current transformer limiting grooves 411 and zero sequence current transformer limiting grooves 412 are formed in the base 41, the plurality of current transformers 421 are disposed in the corresponding current transformer limiting grooves 411, so that the current transformers 421 are positioned on the base 41, and the zero sequence current transformer 431 is disposed in the zero sequence current transformer limiting grooves 412, so that the zero sequence current transformer 431 is positioned on the base 41. The electronic leakage molded case circuit breaker further comprises a cover 45, the cover 45 covers the plurality of current transformers 421 and is fixed with the base 41 through screws, the base 41 and the cover 45 are respectively provided with a first conductive bar limiting groove I413 and a second conductive bar limiting groove II 451 for limiting the conductive bar 44, the second conductive bar limiting groove II 451 corresponds to the first conductive bar limiting groove I413, the position state shown in fig. 4 is taken as an example, the plurality of current transformers 421 are vertically arranged in sequence from left to right, are arranged in front and back close to the zero sequence current transformer 431, and are independently arranged in the longitudinal direction of the conductive bar 44 penetrating through the current transformers 421. The opening of the current transformer 421 through which the conductive bar 44 passes is rectangular, and the height dimension (i.e. the dimension in the longitudinal direction) of the rectangle is larger than the width dimension, and the conductive bar 44 is a common plate-shaped metal bar, the cross section of the conductive bar 44 in the longitudinal direction is rectangular, and the longitudinal arrangement is that the height dimension of the cross section of the conductive bar 44 is larger than the width dimension. Specifically, the phase a conductive bar 441, the phase N conductive bar 444, the phase B conductive bar 442, and the phase C conductive bar 443 in the conductive bar 44 are integrally manufactured and sequentially vertically pass through the current transformer 421 and the zero sequence current transformer 431, when the phase a conductive bar 441, the phase B conductive bar 442, the phase C conductive bar 443, and the phase N conductive bar 444 respectively vertically pass through the corresponding current transformer 421, the first conductive bar limiting groove i 413 on the base 41 limits the corresponding conductive bar 44, that is, the conductive bar 44 is positioned between the base 41 and the housing 45 at a position corresponding to a position between the first conductive bar limiting groove i 413 and the second conductive bar limiting groove ii 451. The cover 45 covers the plurality of current transformers 421, and the second conductive bar limiting groove II 451 on the cover 45 is matched with the first conductive bar limiting groove I413 to limit the corresponding conductive bar. Wherein the housing 45 is preferably integral as shown. Of course, as shown in fig. 7, the cover 45 is a separate body and covers each current transformer 421. The current transformer 421 and the zero sequence current transformer 431 are compactly arranged front and back, that is, arranged close to each other front and back, so that when the conducting bar 44 vertically penetrates through the current transformer 421, the space in the width direction of the circuit breaker is saved, the compactness of the whole structure is ensured, and the structure minimization in the width direction of the circuit breaker is realized.

From the above description, the following previously set forth by the applicant is demonstrated: the conductive bar 44 includes an a-phase conductive bar 441, a B-phase conductive bar 442, a C-phase conductive bar 443, and an N-phase conductive bar 444, the B-phase conductive bar 442 and the C-phase conductive bar 443 are disposed between the a-phase conductive bar 441 and the N-phase conductive bar 444, a zero-sequence current transformer through hole 4311 penetrating from one side to the other side of the zero-sequence current transformer 431 is formed at a central position of the zero-sequence current transformer 431, the a-phase conductive bar 441 and the N-phase conductive bar 444 penetrate through the zero-sequence current transformer through hole 4311 and are each formed in a U-shape, and the B-phase conductive bar 442 and the C-phase conductive bar 443 penetrate through the zero-sequence current transformer through hole 4311 at positions corresponding to lower portions of the a-phase conductive bar 441 and the N-phase conductive bar 444, respectively, and are also each formed in a U-shape. The U-shaped openings of the a-phase conductor row 441 and the N-phase conductor row 444 are opposite in direction (e.g., the former is left and the latter is right in the position shown in fig. 2); the U-shaped openings of the B-phase conductor row 442 and the C-phase conductor row 443 are in opposite directions (e.g., the former is in the left direction and the latter is in the right direction in the positional state shown in fig. 2).

As can be seen from the above, the directions of the U-shaped openings of the phase a conductive line 441 and the phase B conductive line 442 are the same; the directions of the U-shaped openings of the N-phase conductor row 444 and the C-phase conductor row 443 are the same.

As shown in fig. 3, the overcurrent detecting assembly 42 further includes at least two magnetic trips 422, and in this embodiment, the two magnetic trips 422 are respectively installed in the a-phase and the C-phase.

To sum up, the utility model discloses because from left to right arrange a plurality of current transformer 421 vertically in proper order and with near arranging around zero sequence current transformer 431, the electrically conductive row 44 that runs through in current transformer 421 alone is vertical arrangement. The connection mode enables the space layout to be more reasonable, saves the space in the width direction of the circuit breaker, ensures the compactness of the whole structure and has great significance for reducing the volume of the leakage built-in molded case circuit breaker.

Claims (9)

1. A circuit breaker comprising current transformers equal in number to the phases of the circuit breaker and a conducting bar equal in number to the current transformers and passing through the current transformers, characterized in that: the current transformers are sequentially arranged from left to right, openings for the conducting bars to penetrate through are rectangular, the height size of the rectangle is larger than the width size, and the conducting bars penetrate through the openings of the current transformers in a longitudinally arranged state.

2. The circuit breaker of claim 1, further comprising a zero sequence current transformer, said current transformer and said zero sequence current transformer being disposed in close proximity to each other, said conductive bar passing through the current transformer and the zero sequence current transformer in sequence.

3. The circuit breaker according to claim 1, wherein said circuit breaker further comprises a base having zero sequence current transformer position-limiting grooves formed therein and having a number of current transformer position-limiting grooves equal to the number of said current transformers, said zero sequence current transformers being disposed on said base at positions corresponding to the zero sequence current transformer position-limiting grooves, and the current transformers being disposed on said base at positions corresponding to the current transformer position-limiting grooves.

4. The circuit breaker of claim 3, further comprising a housing, the housing being configured to mate with the base in a state of covering the current transformer.

5. The circuit breaker of claim 4 wherein a first conductor bar retaining groove I is formed in the base and a second conductor bar retaining groove II is formed in the housing, the second conductor bar retaining groove II corresponding to the first conductor bar retaining groove I, the conductor bar being positioned between the base and the housing at a location corresponding to a location between the first conductor bar retaining groove I and the second conductor bar retaining groove II.

6. The circuit breaker according to claim 2, wherein said conductive bars include an a-phase conductive bar, a B-phase conductive bar, a C-phase conductive bar, and an N-phase conductive bar, the B-phase conductive bar and the C-phase conductive bar are disposed between the a-phase conductive bar and the N-phase conductive bar, a zero-sequence current transformer through hole penetrating from one side to the other side of the zero-sequence current transformer is formed at a central position of the zero-sequence current transformer, the a-phase conductive bar and the N-phase conductive bar pass through the zero-sequence current transformer through hole and each form a U-shape, and the B-phase conductive bar and the C-phase conductive bar pass through the zero-sequence current transformer through hole at positions corresponding to lower portions of the a-phase conductive bar and the N-phase conductive bar, respectively, and each form a U-shape.

7. The circuit breaker of claim 6, wherein the zero sequence current transformer through hole is a circular hole.

8. The circuit breaker according to claim 6, wherein the opening directions of the U-shapes of the A-phase and N-phase conductive bars are opposite to each other; the opening directions of the U-shapes of the B-phase conductive row and the C-phase conductive row are opposite to each other.

9. The circuit breaker according to claim 6 or 8, wherein the directions of the openings of the U-shapes of the a-phase and B-phase conductive bars are the same; the directions of the U-shaped openings of the N-phase conductive row and the C-phase conductive row are the same.

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