An economical direct current molded case circuit breaker

Abstract

The utility model discloses an economic direct current moulded case circuit breaker, including shell, circuit breaker handle, contact mechanism, arc extinguishing mechanism, pivot, operating mechanism wiring end, and wiring end includes wiring busbar, one end of movable contact forms and forms contact mounting part, and contact mounting part is equipped with first limit axle, and the pivot is equipped with second limit axle, contact mounting axle and tension spring, contact mounting part is rotatablely installed on the pivot through contact mounting axle, and second limit axle is limited on the pivot and is distributed on the one side of contact mounting part, and the both ends of tension spring are connected with first limit axle and second limit axle respectively, and operating mechanism is compatibility modular operating mechanism, the utility model discloses direct current moulded case circuit breaker's structure design is reasonable, and through structure optimization can be favorable to reducing product production cost, and is favorable to product miniaturization design.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an economical DC molded case circuit breaker. Background Technology

[0002] DC molded case circuit breakers (MCCBs) are important electrical protection devices widely used in DC power distribution systems, playing a crucial role in photovoltaic power generation, rail transportation, and energy storage systems. With technological advancements, the rated current requirements for DC MCBs are gradually increasing, particularly for products with ratings of 400A and above. However, the design of traditional 400A DC MCBs suffers from the following problems:

[0003] Large size: Due to design limitations of core components such as the operating mechanism and contact system, the overall size is large, which increases the difficulty of installation and maintenance, and also limits its application in space-constrained situations.

[0004] Insufficient design flexibility: Traditional operating mechanisms are large in size, occupy a lot of space, limit the optimization design of other functional components, and are difficult to meet the needs of compact products.

[0005] To address the aforementioned issues, while existing technologies have attempted structural optimizations for DC molded case circuit breakers, these are mostly localized improvements and fail to adequately address problems such as large size and high cost. For example, some solutions only optimize the contact system or arc-extinguishing device without considering the synergistic effect between the operating mechanism and other components, resulting in limited optimization effectiveness.

[0006] Therefore, there is an urgent need for a new technical solution that can reduce the size and production cost of DC molded case circuit breakers while ensuring performance and reliability, so as to meet the market demand for high rated current DC molded case circuit breakers. Utility Model Content

[0007] The purpose of this utility model is to provide an economical DC molded case circuit breaker with a compact structure and reduced production costs.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This utility model provides an economical DC molded case circuit breaker, including a housing, a circuit breaker handle mounted on the housing, a contact mechanism having moving and stationary contacts, an arc-extinguishing mechanism distributed on one side of the contact mechanism, a rotating shaft for mounting the moving contact, an operating mechanism connected to the circuit breaker handle and used to drive the rotating shaft, and terminals located at both ends of the housing, the terminals including busbars; one end of the moving contact forms a contact mounting portion, the contact mounting portion being equipped with a first limiting shaft; the rotating shaft is provided with a second limiting shaft, a contact mounting shaft, and a tension spring; the contact mounting portion is rotatably mounted on the rotating shaft via the contact mounting shaft, the second limiting shaft is limited on the rotating shaft and distributed on one side of the contact mounting portion, one end of the tension spring is connected to the first limiting shaft, and the other end is connected to the second limiting shaft, the operating mechanism being a compatible modular operating mechanism.

[0010] Preferably, the rotating shaft has a number of contact mounting slots that match the number of moving contacts. The contact mounting part extends into the contact mounting slot, and a stop is provided in the contact mounting slot to stop the contact mounting part and limit the rotation angle of the moving contact relative to the rotating shaft. The first limiting shaft, the second limiting shaft, the contact mounting shaft, and the tension spring are arranged in the contact mounting slot.

[0011] Preferably, the second limiting shaft is installed in the upper area of ​​the contact mounting groove, the lower side of the contact mounting part is provided with a positioning slot, both sides of the contact mounting part are provided with tension springs, the middle part of the first limiting shaft is inserted into the positioning slot and both ends extend out and are engaged with the tension springs on the corresponding sides.

[0012] Preferably, the two opposite sidewalls of the contact mounting groove are provided with upward-opening U-shaped slots, and the two ends of the second limiting shaft are respectively engaged in the corresponding U-shaped slots.

[0013] Preferably, a moving contact is provided at the end of the moving contact away from the contact mounting portion; the thickness of the moving contact is at least 6mm.

[0014] Preferably, the operating mechanism has two drive links spaced apart and symmetrically arranged on both sides of the moving contact, one end of which extends to connect with the rotating shaft.

[0015] The positive effects of this utility model are as follows: This utility model optimizes the structure of DC molded case circuit breakers. By adopting a compatible modular operating mechanism, it can be used in different types of DC molded case circuit breakers, increasing structural compatibility, reducing production costs, and the operating mechanism is small in size, effectively improving the compactness of the design. At the same time, by optimizing components such as the moving contact mounting structure, the applicability and performance of the product are further enhanced. This synergistic optimization not only helps to reduce the overall size of the DC molded case circuit breaker, but also reduces production costs and enhances the product's market competitiveness. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0017] Figure 1 This is a three-dimensional schematic diagram of the DC molded case circuit breaker in this utility model;

[0018] Figure 2 This is a top view schematic diagram of the DC molded case circuit breaker in this utility model;

[0019] Figure 3 for Figure 2 AA sectional view;

[0020] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0021] Figure 5 This is a schematic diagram showing the working state of the handle, rotating shaft, moving contact, and operating mechanism in this utility model;

[0022] Figure 6 This is another schematic diagram showing the working state of the handle, rotating shaft, moving contact, and operating mechanism in this utility model;

[0023] Figure 7 for Figure 6 A magnified view of a portion of point C.

[0024] The reference numerals in the figure are as follows: 1. Housing; 2. Circuit breaker handle; 3. Contact mechanism; 31. Moving contact; 32. Contact mounting part; 33. First limiting shaft; 34. Positioning bayonet; 4. Arc extinguishing mechanism; 5. Rotating shaft; 51. Second limiting shaft; 52. Contact mounting shaft; 53. Tension spring; 54. Contact mounting groove; 55. Stop; 56. U-shaped groove; 6. Operating mechanism; 61. Drive linkage; 7. Busbar. Detailed Implementation

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0027] The structure of the economical DC molded case circuit breaker in this embodiment of the utility model is as follows: Figures 1 to 7 As shown, it includes a housing 1, a circuit breaker handle 2 mounted on the housing 1, a contact mechanism 3 having a moving contact 31 and a stationary contact, an arc-extinguishing mechanism 4 distributed on one side of the contact mechanism 3, a rotating shaft 5 for mounting the moving contact 31, an operating mechanism 6 connected to the circuit breaker handle 2 and used to drive the rotating shaft 5, and terminals located at both ends of the housing 1, the terminals including busbars 7; one end of the moving contact 31 forms a contact mounting portion 32, the contact mounting portion 32 is equipped with a first limiting shaft 33; the rotating shaft 5 is provided with a second limiting shaft 51 and a contact mounting shaft 52. 2. A tension spring 53 is also included. The contact mounting part 32 is rotatably mounted on the rotating shaft 5 via the contact mounting shaft 52. The second limiting shaft 51 is located on the rotating shaft 5 and distributed on one side of the contact mounting part 32. One end of the tension spring 53 is connected to the first limiting shaft 33, and the other end is connected to the second limiting shaft 51. The operating mechanism 6 is a compatible modular operating mechanism. The compatible modular operating mechanism is a modular operating mechanism that can be adapted to different models of DC circuit breakers, such as 250A DC circuit breakers and 400A DC circuit breakers. In this embodiment, the combined action of the first limiting shaft 33, the second limiting shaft 51, the contact mounting shaft 52, and the tension spring 53 ensures the stability and service life of the moving contact 31 during frequent operation, making it particularly suitable for DC circuit breakers under high current load environments.

[0028] The tension spring 53 used stores and releases energy through stretching and elastic deformation, providing a larger range of elastic force. This allows it to better adapt to the large-scale rotation of the moving contact 31 on the rotating shaft 5, thereby increasing the opening distance between the moving and stationary contacts. Furthermore, combined with a compatible modular operating mechanism adapted to different specifications of DC circuit breakers, it helps to miniaturize the size of DC molded case circuit breakers and reduces production costs, making it more economical.

[0029] In this embodiment, during the closing process of the DC molded case circuit breaker, the operating mechanism 6 drives the rotating shaft 5 to rotate. When the moving contact 31 contacts the stationary contact, the rotating shaft 5 continues to rotate under the operation mechanism 6. During this process, the tension spring 53 is stretched to store energy, and the elastic contact pressure provided by the tension spring 53 ensures reliable contact between the moving contact 31 and the stationary contact. During the opening process, as the moving contact 31 rotates with the rotating shaft 5, it is also driven to rotate relative to the rotating shaft 5 and reset under the elastic force released by the tension spring 53. The main reason for using a tension spring 53 instead of a torsion spring in this embodiment is that the torsion spring stores and releases energy through torsional elastic deformation, but the range of elastic force it can provide is limited by its own structure, making it difficult to meet the design requirements of a large rotation angle of the moving contact 31 relative to the rotating shaft 5. In contrast, the tension spring 53 stores and releases energy through stretching elastic deformation, providing a larger range of elastic force, thus better adapting to the large rotation of the moving contact 31 on the rotating shaft 5. This solution helps to improve the current-carrying capacity of DC molded case circuit breakers and ensure the stability and reliability of the circuit breaker's opening and closing operations.

[0030] To better accommodate the installation of the moving contact on the rotating shaft 5, a number of contact mounting slots 54, matching the number of groups of moving contacts, are provided on the rotating shaft 5. During assembly, each group of moving contacts is installed in a corresponding contact mounting slot 54. The contact mounting part 32 extends into the contact mounting slot 54, and a stop 55 is provided in the contact mounting slot 54 to stop the contact mounting part 32 and limit the rotation angle of the moving contact 31 relative to the rotating shaft 5, so as to ensure that the moving contact 31 will not rotate excessively during operation, thereby avoiding mechanical damage or poor electrical contact caused by excessive rotation. The first limiting shaft 33, the second limiting shaft 51, the contact mounting shaft 52, and the tension spring 53 are provided in the contact mounting slot 54.

[0031] Furthermore, the second limiting shaft 51 is installed in the upper area of ​​the contact mounting groove 54. The lower side of the contact mounting part 32 is provided with a positioning slot 34. Both sides of the contact mounting part 32 are provided with tension springs 53. The middle part of the first limiting shaft 33 is inserted into the positioning slot 34 and both ends extend out and are hooked to the tension springs 53 on the corresponding sides. The other ends of the two tension springs 53 are hooked on the same second limiting shaft 51 to provide the required contact pressure for the movable contact 8.

[0032] In order to facilitate the installation of the second limiting shaft 51 on the rotating shaft 5, the two opposite side walls of the contact mounting groove 54 are provided with upward-opening U-shaped slots 56. The two ends of the second limiting shaft 51 are respectively locked in the corresponding U-shaped slots 56, thereby achieving reliable positioning of the second limiting shaft 51.

[0033] Preferably, a moving contact is provided on the moving contact 31 at the end away from the contact mounting portion 32; the thickness of the moving contact 31 is at least 6mm, such as 6mm, 7mm, or 8mm; by limiting the thickness of the moving contact 31 to more than 6mm, the current carrying capacity of the moving contact 31 can be increased to meet the design requirements of high-current products.

[0034] Preferably, the operating mechanism 6 has two drive links 61 spaced apart and symmetrically arranged on both sides of the moving contact, one end of each drive link 61 extending to connect with the rotating shaft 5; the driving force of the operating mechanism 6 is transmitted to the rotating shaft 5 through the two drive links 61, ensuring the stability of the rotation of the rotating shaft 5 and improving the performance of the product.

[0035] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the protection scope of this utility model.

Claims

1. An economical DC molded case circuit breaker, comprising a housing (1), a circuit breaker handle (2) disposed on the housing (1), a contact mechanism (3) having a moving contact (31) and a stationary contact, an arc-extinguishing mechanism (4) distributed on one side of the contact mechanism (3), a rotating shaft (5) for mounting the moving contact (31), an operating mechanism (6) connected to the circuit breaker handle (2) and used to drive the rotating shaft (5) to operate, and terminals disposed at both ends of the housing (1), wherein the terminals include busbars (7); characterized in that: The moving contact (31) has a contact mounting part (32) at one end, and the contact mounting part (32) is equipped with a first limiting shaft (33); the rotating shaft (5) is provided with a second limiting shaft (51), a contact mounting shaft (52) and a tension spring (53); the contact mounting part (32) is rotatably mounted on the rotating shaft (5) via the contact mounting shaft (52), the second limiting shaft (51) is limited on the rotating shaft (5) and distributed on one side of the contact mounting part (32), one end of the tension spring (53) is connected to the first limiting shaft (33) and the other end is connected to the second limiting shaft (51), and the operating mechanism (6) is a compatible modular operating mechanism.

2. The economical DC molded case circuit breaker according to claim 1, characterized in that: The rotating shaft (5) has a number of contact mounting slots (54) that match the number of moving contacts. The contact mounting part (32) extends into the contact mounting slot (54), and a stop (55) is provided in the contact mounting slot (54) to stop the contact mounting part (32) and limit the rotation angle of the moving contact (31) relative to the rotating shaft (5). The first limiting shaft (33), the second limiting shaft (51), the contact mounting shaft (52), and the tension spring (53) are provided in the contact mounting slot (54).

3. The economical DC molded case circuit breaker according to claim 2, characterized in that: The second limiting shaft (51) is installed in the upper area of ​​the contact mounting groove (54). The lower side of the contact mounting part (32) is provided with a positioning slot (34). The contact mounting part (32) is provided with tension springs (53) on both sides. The middle part of the first limiting shaft (33) is inserted into the positioning slot (34) and both ends extend out to be hooked with the tension springs (53) on the corresponding sides.

4. The economical DC molded case circuit breaker according to claim 3, characterized in that: The contact mounting groove (54) has two opposite side walls with upward-opening U-shaped slots (56), and the two ends of the second limiting shaft (51) are respectively locked in the corresponding U-shaped slots (56).

5. The economical DC molded case circuit breaker according to claim 1, characterized in that: The moving contact (31) has a moving contact point at one end away from the contact mounting part (32); the thickness of the moving contact (31) is at least 6 mm.

6. The economical DC molded case circuit breaker according to claim 1, characterized in that: The operating mechanism (6) has two spaced drive links (61), one end of which extends to connect with the rotating shaft (5).

Images