A double-breakpoint molded case circuit breaker with modular structure

Abstract

A double-breakpoint molded case circuit breaker with a modular structure, the upper and lower covers of which are three-pole integrated molded structures, the upper and lower static contact connecting pieces of the molded case circuit breaker are molded in flame-retardant, high-temperature resistant insulating materials, an arc-isolating wall is provided between each pole in the upper and lower covers, and the circuit breaker is also provided with a separate fourth single pole. Since the upper and lower covers and the three-pole rotating shaft of the circuit breaker adopt an integrated molded structure, the structure of the circuit breaker becomes very simple, saving production costs, and since a separate fourth pole is adopted, the single-pole part can be provided on the left or right side of the three-pole part as required to meet the needs of different customers at home and abroad.

Description

Technical Field

[0001] The invention relates to a low-voltage electrical appliance, in particular to a double-breakpoint molded case circuit breaker with a modular structure. Background Art

[0002] Molded case circuit breaker is a commonly used protective device. It has the functions of switching on and off load current and protecting the load current from overload and short circuit. It is widely used in various power distribution systems and motor overload and short circuit protection. Double breakpoint molded case circuit breaker is a newer type of molded case circuit breaker. The traditional double breakpoint molded case circuit breaker adopts a split structure, that is, the moving contact, static contact, arc extinguishing cover, rotating shaft and shell of each pole are made into separate units, and then combined into a multi-pole circuit breaker. This multi-pole circuit breaker requires many components and is complicated to assemble. With the continuous emergence of new flame-retardant and high-temperature resistant insulating materials, molded multi-pole circuit breakers have become possible. Summary of the invention

[0003] The purpose of the present invention is to overcome the drawbacks of traditional multi-pole double-breakpoint molded case circuit breakers that require more electrical components and are complicated to assemble, and to disclose a multi-pole double-breakpoint molded case circuit breaker with a simple structure and molded from high-performance insulating materials.

[0004] The technical solution adopted by the present invention is:

[0005] A double-breakpoint molded case circuit breaker with a modular structure, comprising an upper cover, a lower cover, a double-breakpoint moving contact, an upper stationary contact, a lower stationary contact, a rotating shaft, a three-pole part, a single-pole part, a junction box, a three-pole top cover, and a single-pole top cover;

[0006] It is further arranged that the three-pole part comprises a three-pole top cover, a three-pole upper cover, and a three-pole lower cover;

[0007] The monopole part comprises a monopole top cover, a monopole upper cover and a monopole lower cover;

[0008] It is further provided that the upper static contact comprises an upper static contact connecting piece and an upper static contact at its end, the three-pole upper cover is a three-pole integrated structure, the upper static contact connecting pieces of the three poles of the double-breakpoint molded case circuit breaker are all molded in flame-retardant, high-temperature resistant high-performance insulating material, and in the three-pole upper cover, an arc isolation wall is provided between each pole.

[0009] It is further provided that the lower static contact comprises a lower static contact connecting piece and a lower static contact at its end, the three-pole lower cover is a three-pole integrated structure, the lower static contact connecting pieces of the three poles of the double-breakpoint molded case circuit breaker are all molded in flame-retardant and high-temperature resistant high-performance insulating material, and in the three-pole lower cover, an arc isolation wall is provided between each pole.

[0010] It is further provided that the double-breakpoint molded case circuit breaker is also provided with a separate fourth single pole, and the upper static contact connecting piece and the lower static contact connecting piece of the fourth pole are also molded in the upper cover and the lower cover of the single pole respectively. The single pole part can be arranged on the left or right side of the three-pole part as needed to form a four-pole double-breakpoint molded case circuit breaker.

[0011] It is further configured that the rotating shaft of the three-pole part of the double-breakpoint molded case circuit breaker is configured as a three-pole integrated molded structure, and the three double-breakpoint moving contacts of the three-pole double-breakpoint molded case circuit breaker are arranged in the rotating shaft of the integrated molded structure through contact supports.

[0012] The double-breakpoint molded case circuit breaker of the above structure has the following beneficial effects:

[0013] Since the upper and lower static contact connecting pieces of the three poles of the double-break molded case circuit breaker are molded in the upper and lower covers of the three poles, and a rotating shaft of a three-pole integrated molded structure is used, the structure of this multi-pole double-break molded case circuit breaker becomes very simple, reducing the production and assembly of electrical components and saving production costs. Since a separate fourth pole is used, this pole can be

[0014] It can be installed on the right side of a three-pole circuit breaker, or on the left side of a three-pole circuit breaker to form a four-pole circuit breaker, which can conveniently meet the needs of different customers at home and abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the single-pole structure diagram of a traditional double-break molded case circuit breaker;

[0016] Figure 2 This is the appearance diagram of the four-pole modular structure double-breakpoint molded case circuit breaker of the present invention;

[0017] Figure 3 for Figure 2 The upper and lower cover structure diagram of the three-pole;

[0018] Figure 4 for Figure 2 Schematic diagram of the three-pole cross section after removing the top cover

[0019] Figure 5 for Figure 2 Structural diagram of the monopole part;

[0020] Figure 6 for Figure 2 Shaft structure diagram. DETAILED DESCRIPTION

[0021] Combination Figure 1 to Figure 6 , the present invention is further illustrated by specific embodiments.

[0022] It should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] Figure 1 The figure is a single-pole structure diagram of a conventional double-break molded case circuit breaker, in which the double-break moving contact 3, rotating shaft 4, upper static contact 1, lower static contact 5, and arc extinguishing cover 6 are combined in the upper cover 7 and the lower cover 2 to form a single-pole unit, which can then be combined into a 2-4-pole double-break molded case circuit breaker as needed.

[0024] The present invention provides a double-breakpoint molded case circuit breaker with a modular structure, such as Figure 2 to Figure 4 As shown,

[0025] A double-breakpoint molded case circuit breaker with a modular structure, comprising an upper cover 7, a lower cover 2, a double-breakpoint moving contact 3, an upper static contact 1, a lower static contact 5, a rotating shaft 4, a three-pole part 11, a single

[0026] Pole part 10, junction box 9 and three-pole top cover 8, single-pole top cover 101.

[0027] The three-pole part comprises a three-pole top cover 8 , a three-pole upper cover 7 , and a three-pole lower cover 2 .

[0028] The upper static contact 1 includes an upper static contact connecting piece 102 and an upper static contact point 101 at the end. The three-pole upper cover 7 is a three-pole integrated molded structure, which integrally molds the connecting piece 102 of the upper static contact 1 of the three poles in the flame-retardant, high-temperature resistant high-performance insulating material DMC unsaturated polyester fiber reinforced molding compound, leaving only the upper static contact point 101 for the moving contact to connect and conduct electricity. An arc isolation wall 701 is arranged between the poles of the three-pole upper cover 7.

[0029] The lower static contact 5 includes a lower static contact connecting piece 502 and a lower static contact 501 at the end. The three-pole lower cover 2 is a three-pole integrated molded structure, which integrally molds the connecting piece 502 of the lower static contact 5 of the three poles in a flame-retardant, high-temperature resistant high-performance insulating material, leaving only the lower static contact 501 for its moving contact to connect and conduct electricity. An arc isolation wall 201 is arranged between the poles of the three-pole lower cover 2.

[0030] According to the requirements, the molded case circuit breaker is also provided with a separate fourth single pole 10, such as Figure 5 As shown, the fourth pole 10 also has the connecting pieces of the upper static contact and the lower static contact molded in the upper cover 1002 and the lower cover 1003 of the single pole respectively, and a separate top cover 1001 is also provided. The fourth pole 10 can be provided on the left or right side of the three-pole part as needed to form a four-pole double-breakpoint molded case circuit breaker.

[0031] Further settings, such as Figure 6 As shown, the rotating shaft 4 of the double-breakpoint molded case circuit breaker is a three-pole integrated molded structure, and the three double-breakpoint moving contacts 3 of the three poles of the double-breakpoint molded case circuit breaker are arranged in the three mounting holes 401 of the rotating shaft 4 through contact supports 402.

[0032] The above examples are not intended to limit the implementation methods. For ordinary technicians in the field, other different forms of changes can be made based on the above description.

[0033] It is not necessary and impossible to list all the embodiments here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A double-breakpoint molded case circuit breaker with a modular structure, comprising a double-breakpoint moving contact, an upper stationary contact, a lower stationary contact, a rotating shaft, a three-pole part, a single-pole part, a junction box and a three-pole top cover, a single-pole top cover; Its characteristics are: The three-pole part includes a three-pole top cover, a three-pole upper cover, and a three-pole lower cover, and the monopole part includes a monopole top cover, a monopole upper cover, and a monopole lower cover; The upper static contact comprises an upper static contact connecting piece and an upper static contact point at the end of the upper static contact connecting piece; The lower stationary contact comprises a lower stationary contact connecting piece and a lower stationary contact point at the end of the lower stationary contact connecting piece; The three-pole upper cover is an integrated molded structure, and the upper static contact connecting pieces of the three poles of the double-break molded case circuit breaker are all molded in the three-pole upper cover, leaving only the upper static contact for the moving contact to connect and conduct electricity; The three-pole lower cover is an integrated molded structure, and the lower static contact connecting pieces of the three poles of the double-break molded case circuit breaker are all molded in the three-pole lower cover, leaving only the lower static contact for the moving contact to connect and conduct electricity; The single-pole upper cover is an integrated molded structure, and the upper static contact connecting piece of the single-pole part of the double-breakpoint molded case circuit breaker is molded inside the single-pole upper cover; The single-pole lower cover is an integrated molded structure, and the lower static contact connecting piece of the single-pole part of the double-breakpoint molded case circuit breaker is molded in the single-pole lower cover.

2. The double-breakpoint molded case circuit breaker according to claim 1 is characterized in that: In the three-pole upper cover, an arc isolation wall is arranged between each pole.

3. The double-breakpoint molded case circuit breaker according to claim 1 is characterized in that: In the three-pole lower cover, an arc isolation wall is arranged between each pole.

4. The double-break molded case circuit breaker according to any one of claims 1 to 3, characterized in that: The rotating shaft is a three-pole integrated molded structure, and three double-breakpoint moving contacts of the three-pole double-breakpoint molded case circuit breaker are arranged in the rotating shaft through moving contact support members.

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