Current limiting device of double-breakpoint molded case circuit breaker

Abstract

The utility model relates to the technical field of molded case circuit breakers, and discloses a double-breakpoint molded case circuit breaker current limiting device, a molded case circuit breaker comprises at least one shell, an operation assembly is rotatably arranged in the shell, the current limiting device is arranged in the operation assembly, the current limiting device comprises a limiting rod and a feeler lever, and the feeler lever is rotatably connected with the operation assembly; arc-shaped blocks are fixedly arranged on the two sides of the feeler lever, limiting grooves are formed in the two sides of the feeler lever, the limiting grooves are located in one sides of the arc-shaped blocks, and the limiting grooves are connected with the limiting rods; guide grooves are symmetrically formed in the operation assembly, and the limiting rods are slidably connected into the guide grooves. The arc-shaped blocks are designed on the two sides of the feeler lever, the geometric structures of the arc-shaped blocks are matched with the limiting rod, the closing pressure and the opening efficiency of the feeler lever are improved, the current limiting device is designed in the molded case circuit breaker to assist opening and closing of the feeler lever, when the circuit breaker is opened, the limiting rod and the limiting groove are clamped, the feeler lever is clamped and fixed, the feeler lever is prevented from loosening, and the service life of the circuit breaker is prolonged. The feeler lever is prevented from falling off, and the safety and stability of the circuit breaker are ensured.

Description

Technical Field

[0001] This utility model relates to the field of molded case circuit breaker technology, specifically a current limiting device for a double-break molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are devices used for long-term overload and instantaneous short-circuit breaking, including characteristics such as rated ultimate short-circuit breaking capacity and current-limiting breaking capacity.

[0003] In the prior art, such as the application with application number CN202411738567.9, the subject of which is: A three-phase independent opening and closing molded case circuit breaker, including a first mounting cavity and a second mounting cavity; a separating rod is provided in the second mounting cavity, and an opening and closing operation assembly is also provided in the second mounting cavity and sleeved on the outside of the separating rod; a third mounting cavity is also provided below the bottom shell, and a current transformer assembly is installed in the third mounting cavity.

[0004] As mentioned in the prior art, the opening and closing operation components of the molded case circuit breaker have low sensitivity during the opening and closing process, which affects the opening and closing effect of the molded case circuit breaker. Therefore, it is necessary to design a current limiting device for a double-break molded case circuit breaker. Utility Model Content

[0005] The purpose of this invention is to provide a current limiting device for a dual-break molded case circuit breaker to solve the problems in the prior art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A current limiting device for a dual-break molded case circuit breaker, wherein the molded case circuit breaker includes at least one housing, an operating component is rotatably disposed within the housing, the current limiting device is disposed within the operating component, and the current limiting device includes a limiting rod and a contact rod, the contact rod being rotatably connected to the operating component.

[0008] Both sides of the contact rod are fixed with arc-shaped blocks to improve the opening and closing efficiency. Limiting grooves are opened on both sides of the contact rod. The limiting grooves are located on one side of the arc-shaped blocks and are connected to the limiting rod to lock the contact rod.

[0009] The operating component is symmetrically provided with guide grooves, and the limiting rod is slidably connected to the guide groove.

[0010] Furthermore, side plates are fixedly provided at both ends of the operating component, and a shaft tube is fixedly provided on the operating component, with the shaft tube rotatably connected to the housing.

[0011] Furthermore, the operating component is provided with two through holes located on both sides of the shaft tube, and a through groove for mounting the contact rod is provided through the operating component. Guide grooves are located on both sides of the operating component, and the through groove and the guide groove are connected.

[0012] Furthermore, the operating component has mounting grooves on both sides, and springs are installed in the mounting grooves. The two ends of the springs are respectively connected to the ends of two limit rods.

[0013] Furthermore, movable contacts are fixed at both ends of the contact rod, and two limiting rods are located on both sides of the contact rod. The two sides of the arc block are arc surface one and arc surface two, respectively. Arc surface one is located between arc surface two on the same side and the limiting groove. The limiting rod is slidably connected to arc surface one and arc surface two.

[0014] Furthermore, two wires are fixedly installed inside the housing, and stationary contacts are fixedly installed at the ends of the wires.

[0015] The beneficial effects of this utility model are:

[0016] 1. The current limiting device of this utility model designs arc-shaped blocks on both sides of the contact rod. The geometric structure of the arc-shaped blocks cooperates with the limiting rod to control the contact position between the limiting rod and the arc-shaped blocks, maintain the pressure of the limiting rod on the arc-shaped blocks, improve the closing pressure and opening efficiency of the contact rod, and help improve the double-break opening and closing effect of the molded case circuit breaker.

[0017] 2. The current limiting device of this utility model is designed inside the molded case circuit breaker to assist the opening and closing of the contact rod. When the circuit breaker is opened, the limit rod and the limit groove are locked together to secure the contact rod, prevent the contact rod from loosening, prevent the contact rod from falling, and ensure the safety and stability of the circuit breaker. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the molded case circuit breaker of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the molded case circuit breaker of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the molded case circuit breaker of this utility model;

[0022] Figure 4 This is a schematic diagram of the current limiting device of this utility model;

[0023] Figure 5 This is a schematic diagram of the contact rod of this utility model.

[0024] The attached diagram is described below:

[0025] 1. Wire; 2. Operating component; 3. Limiting rod; 4. Contact rod; 21. Side plate; 22. Shaft tube; 23. Through hole; 24. Through groove; 25. Guide groove; 26. Mounting groove; 41. Arc surface one; 42. Limiting groove; 43. Arc surface two. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] A current limiting device for a double-break molded case circuit breaker, according to Figures 1-5 As shown, the molded case circuit breaker includes at least one housing, and multiple housings are installed side by side. Two conductors 1 are fixedly installed inside the housing, and a stationary contact is fixedly installed at the end of the conductor 1 located inside the housing.

[0028] An operating component 2 is rotatably mounted inside the housing. The operating component 2 contains a flow limiting device, which includes a limiting rod 3 and a contact rod 4. Side plates 21 are fixedly mounted at both ends of the operating component 2. A shaft tube 22 is fixedly mounted on the operating component 2 and is rotatably connected to the housing. Two through holes 23 are opened on the operating component 2, located on both sides of the shaft tube 22. A through groove 24 is opened on the operating component 2, penetrating the operating component 2. Symmetrically distributed guide grooves 25 are opened on the operating component 2, located on both sides of the operating component 2.

[0029] The through groove 24 is connected to the guide groove 25. A limiting rod 3 is slidably provided in the guide groove 25. The two sides of the operating component 2 are provided with mounting grooves 26. A spring is installed in the mounting groove 26. The spring is not shown in the figure. The two ends of the spring are respectively connected to the ends of the limiting rod 3 in the two guide grooves 25. A contact rod 4 is rotatably provided in the through groove 24 on the operating component 2. The two ends of the contact rod 4 are fixed with moving contacts.

[0030] Two limit rods 3 are located on both sides of the contact rod 4. Limit grooves 42 are provided on both sides of the contact rod 4. After the limit grooves 42 are locked with the limit rods 3, the limit rods 3 restrict the contact rod 4 to prevent the contact rod 4 from loosening when the circuit is opened, to prevent the moving contact from falling and causing accidental contact, and to protect the safety of the equipment.

[0031] Both sides of the contact rod 4 are fixed with arc-shaped blocks. The two sides of the arc-shaped blocks are arc surface one 41 and arc surface two 43, respectively. Arc surface one 41 is located between arc surface two 43 on the same side and the limiting groove 42.

[0032] The working principle and effects are as follows:

[0033] When the contact rod 4 is in the closed state, the limit rod 3 is located on the arc surface 43. The spring pulls the two limit rods 3 and applies pressure to the arc surface 43, so that the two ends of the contact rod 4 maintain pressure on the stationary contact, so that the moving contact and the stationary contact are precisely in contact, maintaining the closing pressure and improving the closing stability.

[0034] When the contact rod 4 is in the open state, the limit rod 3 slides from the second arc surface 43 along the arc block to the first arc surface 41. At this time, the limit rod 3 applies pressure to the first arc surface 41, assisting the contact rod 4 to rotate and open the circuit until the limit rod 3 is in the limit groove 42 and the contact rod 4 is fixed. In this process, the limit rod 3 and the arc block structure are set to improve the opening efficiency and the opening speed is fast.

[0035] A double-break locking mechanism is designed inside the molded case circuit breaker to lock the two contacts and prevent the moving contact from falling abnormally after opening. An arc-shaped block structure is designed on the contact rod 4. By utilizing the geometry on both sides of the arc block and the structure of the limit groove 42, it is easy to lock the limit groove 42 and the limit rod 3 during the opening and closing process of the contact rod 4.

[0036] The structure is simple, lightweight, reduces costs, is easy to install, and improves installation efficiency.

[0037] During the opening process of contact rod 4, limit rod 3 applies pressure to arc surface 41 to assist contact rod 4 in opening, improve the opening efficiency of contact rod 4, and speed up the opening process.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A dual-break molded case circuit breaker current limiting device, comprising: The plastic shell circuit breaker comprises at least one shell, an operating assembly (2) is rotatably arranged in the shell, a current limiting device is arranged in the operating assembly (2), the current limiting device comprises a limiting rod (3) and a contact rod (4), and the contact rod (4) is rotatably connected with the operating assembly (2); Arc-shaped blocks for improving the efficiency of opening and closing are fixedly arranged on both sides of the contact rod (4), limiting grooves (42) are formed in both sides of the contact rod (4), the limiting grooves (42) are located on one side of the arc-shaped blocks, the limiting grooves (42) are connected with the limiting rods (3), and the limiting grooves (42) are used for clamping the contact rod (4). The limiting rods (3) are slidably connected with the guide grooves (25) in the operating assembly (2).

2. A dual-break plastic molded case circuit breaker current limiting device according to claim 1 wherein, Side plates (21) are fixedly arranged at both ends of the operating assembly (2), shaft tubes (22) are fixedly arranged on the operating assembly (2), and the shaft tubes (22) are rotatably connected with the shell.

3. A dual-break plastic molded case circuit breaker current limiting device according to claim 2 wherein, Two through holes (23) are arranged on the operating assembly (2), the two through holes (23) are located on both sides of the shaft tubes (22), a through groove (24) for mounting the contact rod (4) is arranged on the operating assembly (2), the guide grooves (25) are located on both sides of the operating assembly (2), and the through groove (24) is in communication with the guide grooves (25).

4. The dual-break plastic molded case circuit breaker current limiting device of claim 1, wherein, Mounting grooves (26) are arranged on both sides of the operating assembly (2), springs are mounted in the mounting grooves (26), and both ends of the springs are connected with the end portions of the two limiting rods (3).

5. The dual-break plastic molded case circuit breaker current limiting device of claim 1, wherein, The contact rod (4) is rotatably connected with the operating assembly (2), arc faces one (41) and two (43) are arranged on both sides of the arc-shaped blocks, the arc face one (41) is located between the arc face two (43) on the same side and the limiting groove (42), and the limiting rod (3) is slidably connected with the arc face one (41) and the arc face two (43).

6. A dual-break plastic molded case circuit breaker current limiting device according to claim 1 wherein, Two wires (1) are fixedly arranged in the shell, and static contact heads are fixedly arranged at the end portions of the wires (1).

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