Improved miniature residual-current circuit breaker
By opening through holes at the front end of the small circuit breaker housing and installing a zero-sequence current transformer with a higher rated current value, the problem of insufficient internal space of the traditional small circuit breaker is solved, the increase of the rated current value is achieved, and the higher Application scenarios for current requirements.
Patent Information
- Application Number
- CN202421296841.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Traditional small circuit breakers have small internal space and are difficult to accommodate zero-sequence current transformers with higher rated current values, resulting in an upper limit on the rated current for small circuit breakers to operate.
By opening a through hole at the front end of the housing and embedding the zero-sequence current transformer inside the through hole, the internal space is added to accommodate the zero-sequence current transformer with a higher rated current value, and the volume of the arc extinguishing mechanism is adjusted. and location to make room.
The rated current value of the small circuit breaker has been effectively increased from the original 40A to 63A, meeting the practical application scenarios of higher current requirements.
Smart Images
Figure CN222514878U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to an improved small leakage circuit breaker. Background Art
[0002] Miniature circuit breakers, also known as miniature circuit breakers, are suitable for AC 50 / 60Hz rated voltage 230 / 400V. They can be used for infrequent line operation conversion under normal circumstances. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise and residential buildings.
[0003] like Figure 3 and Figure 4 As shown in the figure, it is a schematic diagram of the internal structure of the previous generation of miniature circuit breakers. Since the original miniature circuit breakers have more components on the front side and occupy a larger internal space, the zero-sequence current transformer cannot be installed in the front area of the circuit breaker. Only a cavity can be selected on the back side of the circuit breaker to install a zero-sequence current transformer with a compact structure and a rated current value of 40A. However, it is found in actual use that the rated current value of miniature circuit breakers with this structure cannot meet the current actual use needs.
[0004] In view of this, it is particularly important to design a miniature circuit breaker mechanism with a reasonable internal structure layout and a higher rated current value in the design, manufacture and actual use of the miniature circuit breaker. Utility Model Content
[0005] The purpose of the utility model is to propose an improved small leakage circuit breaker to solve the problem that the traditional small circuit breaker has a small internal accommodation space and is difficult to accommodate a zero-sequence current transformer with a larger rated current value, resulting in an upper limit on the rated current of the small circuit breaker.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] An improved small leakage circuit breaker comprises a shell, a first wire connection buckle installed on the inner side of the left end of the shell, a second wire connection buckle installed on the inner side of the right end of the shell, an action mechanism installed on the left side of the shell, an operating handle rotatably installed on the upper end of the shell and linked with the action mechanism, an electromagnetic release installed in the middle of the front end of the shell, a double-metal installed between the left side of the shell and the action mechanism and electrically connected to the first wire connection buckle, an electronic tripping mechanism installed on the inner side of the rear end of the shell and facing the action mechanism, an arc extinguishing mechanism and a zero-sequence current transformer arranged on the inner side of the shell, wherein the arc extinguishing mechanism is installed on the inner side of the front end of the shell and is located between the double-metal and the electromagnetic release, a through hole is opened in the shell on the right side of the arc extinguishing mechanism and passes through the shell horizontally, and the zero-sequence current transformer is embedded in the inner side of the through hole.
[0008] As a further description of the above technical solution:
[0009] The arc extinguishing mechanism is composed of an arc extinguishing hood and eight insulating grids. The opening of the arc extinguishing hood is arranged upward, and the eight insulating grids are equidistantly installed between the inner side and the upper end of the arc extinguishing hood.
[0010] As a further description of the above technical solution:
[0011] The through hole is a rectangular hole, and the outer wall of the zero-sequence current transformer fits the inside of the through hole.
[0012] As a further description of the above technical solution:
[0013] The rated current value of the zero-sequence current transformer is 63A.
[0014] As a further description of the above technical solution:
[0015] The second connection wire clip, the electromagnetic release, the double metal and the electronic release mechanism are connected to the internal circuit of the circuit breaker through wires, and the wire parts used all pass through the inner cavity of the zero-sequence current transformer.
[0016] As a further description of the above technical solution:
[0017] A front cover is detachably mounted on the front end of the shell, and a rear cover is detachably mounted on the rear end of the shell.
[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0019] In the utility model, the original structure of the small circuit breaker is scientifically and rationally improved, a through hole which can accommodate a 63A zero-sequence current transformer is opened in the installation area of the original arc extinguishing mechanism of the shell, and the original arc extinguishing mechanism with 13 pieces is adjusted to 8 pieces. The original arc extinguishing mechanism occupies a large volume, and the rear space of this area can coincide with the original installation position of the zero-sequence current transformer. By reducing the volume and adjusting the position of the arc extinguishing mechanism, a through hole can be opened in the vacated space, which is sufficient to accommodate a larger 63A zero-sequence current transformer. This structure effectively improves the actual working rated current value of the small circuit breaker while ensuring that the small circuit breaker can work normally. The improved small circuit breaker can better meet the current actual usage needs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A three-dimensional disassembly schematic diagram of an improved small leakage circuit breaker proposed by the utility model;
[0021] Figure 2It is a three-dimensional rear view schematic diagram of the housing after the rear cover of the utility model is disassembled;
[0022] Figure 3 It is a three-dimensional front view of a disassembled front cover of a previous generation of miniature circuit breaker in the prior art;
[0023] Figure 4 This is a three-dimensional rear view of a disassembled rear cover of a previous generation of miniature circuit breaker in the prior art.
[0024] Legend:
[0025] 1. Shell; 101. Front cover; 102. Rear cover; 103. Through hole; 2. First wire connection buckle; 3. Second wire connection buckle; 4. Action mechanism; 401. Operating handle; 5. Electromagnetic release; 6. Arc extinguishing mechanism; 601. Arc extinguishing cover; 602. Insulating grid; 7. Double metal; 8. Zero-sequence current transformer; 9. Electronic release mechanism. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] See also Figure 1 and Figure 2 The utility model provides a technical solution: an improved small leakage circuit breaker, comprising a shell 1, a first connection wire buckle 2 installed on the inner side of the left end of the shell 1, a second connection wire buckle 3 installed on the inner side of the right end of the shell 1, an action mechanism 4 installed on the left side of the shell 1, an operating handle 401 rotatably installed on the upper end of the shell 1 and linked with the action mechanism 4, an electromagnetic release 5 installed on the middle part of the front end of the shell 1, a double gold 7 installed between the left side of the shell 1 and the action mechanism 4 and electrically connected to the first connection wire buckle 2, an electronic tripping mechanism 9 installed on the inner side of the rear end of the shell 1 and facing the action mechanism 4, an arc extinguishing mechanism 6 and a zero-sequence current transformer 8 arranged on the inner side of the shell 1, the arc extinguishing mechanism 6 is installed on the inner side of the front end of the shell 1 and is located between the double gold 7 and the electromagnetic release 5, and a through hole 103 that penetrates the shell 1 horizontally is opened in the shell 1 on the right side of the arc extinguishing mechanism 6, and the zero-sequence current transformer 8 is embedded in the inner side of the through hole 103.
[0028] Specifically, Figure 1 and Figure 2As shown, the arc extinguishing mechanism 6 is composed of an arc extinguishing cover 601 and eight insulating grids 602. The opening part of the arc extinguishing cover 601 is set upward, and the eight insulating grids 602 are equidistantly installed between the inner side and the upper end of the arc extinguishing cover 601. In the actual working process, the arc generated during the opening and closing process of the action mechanism 4 can be better extinguished.
[0029] Among them, the through hole 103 is a rectangular hole, and the outer wall of the zero-sequence current transformer 8 fits with the inside of the through hole 103, which can reduce the occurrence of problems such as offset, shaking and abnormal noise in the through hole 103 after the zero-sequence current transformer 8 is installed, thereby improving the stability of the small circuit breaker assembly after assembly. At the same time, the extra free area of the cylindrical zero-sequence current transformer 8 and the rectangular through hole 103 facilitates the front and back insertion and hidden storage operation of the circuit part.
[0030] Among them, the rated current value of the zero-sequence current transformer 8 is 63A, which can increase the intensity of the induced current in the working state of the small circuit breaker, thereby being able to increase from the original 40A to the current 63A. The higher rated working current value can make the small circuit breaker suitable for circuit connection requirements in more scenarios.
[0031] At the same time, the internal circuit connection of the circuit breaker is established between the second wiring clip 3, the electromagnetic release 5, the double metal 7 and the electronic release mechanism 9 through wires, and the wire parts used all pass through the inner cavity of the zero-sequence current transformer 8. The circuit parts connected to the internal components of the small circuit breaker pass through the inner cavity of the zero-sequence current transformer 8. The zero-sequence current transformer 8 can sense the current condition of the circuit, thereby monitoring the internal circuit current in real time.
[0032] Specifically, Figure 1 and Figure 2 As shown, a front cover 101 is detachably mounted on the front end of the housing 1, which facilitates the operator to install, inspect and maintain the internal components on the front side of the miniature circuit breaker, and a rear cover 102 is detachably mounted on the rear end of the housing 1, which facilitates the operator to install, inspect and maintain the internal components on the rear side of the miniature circuit breaker.
[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An improved small leakage circuit breaker, comprising a housing (1), a first connection wire buckle (2) mounted on the inner side of the left end of the housing (1), a second connection wire buckle (3) mounted on the inner side of the right end of the housing (1), an action mechanism (4) mounted on the left side of the housing (1), an operating handle (401) rotatably mounted on the upper end of the housing (1) and linked to the action mechanism (4), an electromagnetic release (5) mounted on the middle part of the front end of the housing (1), a double metal (7) mounted on the left side of the housing (1) between the action mechanism (4) and electrically connected to the first connection wire buckle (2), an electronic tripping mechanism (9) mounted on the inner side of the rear end of the housing (1) and facing the action mechanism (4), an arc extinguishing mechanism (6) arranged on the inner side of the housing (1), and a zero-sequence current transformer (8), characterized in that: The arc extinguishing mechanism (6) is installed on the inner side of the front end of the housing (1) and is located between the double metal (7) and the electromagnetic release (5); a through hole (103) is provided in the housing (1) on the right side of the arc extinguishing mechanism (6) and runs through the housing (1) in a transverse direction; and the zero-sequence current transformer (8) is embedded in the inner side of the through hole (103).
2. An improved small leakage circuit breaker according to claim 1, characterized in that: The arc extinguishing mechanism (6) is composed of an arc extinguishing cover (601) and eight insulating grids (602); the opening portion of the arc extinguishing cover (601) is arranged upward, and the eight insulating grids (602) are equidistantly installed between the inner side and the upper end of the arc extinguishing cover (601).
3. The improved small leakage circuit breaker according to claim 1, characterized in that: The through hole (103) is a rectangular hole, and the outer wall of the zero-sequence current transformer (8) fits the inside of the through hole (103).
4. The improved small leakage circuit breaker according to claim 1, characterized in that: The rated current value of the zero-sequence current transformer (8) is 63A.
5. The improved small leakage circuit breaker according to claim 1, characterized in that: The second connection wire buckle (3), the electromagnetic release (5), the double metal (7) and the electronic release mechanism (9) are connected to the internal circuit of the circuit breaker through wires, and the wire parts used all pass through the inner cavity of the zero-sequence current transformer (8).
6. The improved small leakage circuit breaker according to claim 1, characterized in that: A front cover (101) is detachably mounted on the front end of the shell (1), and a rear cover (102) is detachably mounted on the rear end of the shell (1).