A novel plastic-cased circuit breaker shaft positioning device

Abstract

The utility model discloses a rotating shaft positioning device for a plastic case circuit breaker, which comprises a base, a rotating shaft, a side pressure plate, a middle pressure plate and an upper cover plate. The base comprises a three-phase compartment, and the base is provided with small U-shaped grooves on the outer sides of the compartments on both sides of the base. The bottom of the small U-shaped groove is a semicircular groove pit, bearings are connected to both ends of the rotating shaft, and slots I are provided on two side walls of the small U-shaped groove. The side pressure plate can be inserted into the slot I. After the upper cover plate is connected to the base, the side pressure plate is fixed in the slot, a U-shaped notch is provided at the lower end of the side pressure plate, and the side pressure plate is contact-connected with the bearing at the end of the rotating shaft. Compared with the traditional rotating shaft positioning structure, the device increases the rotating shaft limit from two places to four places, reduces the left and right swinging of the rotating shaft during the opening and closing process, ensures that the contact surface of the moving and static contacts does not deviate after the molded case circuit breaker is closed, and the contact is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a novel plastic housing type circuit breaker shaft positioning device. Background Art

[0002] Molded case circuit breaker is a device used for long-time delay overload and instantaneous short-circuit. Its action mechanism includes energy storage mechanism, rotating shaft and moving contact on the rotating shaft. At present, the connection parts between the rotating shaft and the base of low-voltage molded case circuit breaker are two places, which are arranged between the three-phase contact mechanism. The rotating shaft is fixed and limited by the upper cover plate and the base. At present, there are certain problems with the stability of the rotating shaft positioning structure of the existing molded case circuit breaker. When closing the circuit, the impact force of the rotating shaft is large, and the gap between the rotating shaft and the shell can easily cause the rotating shaft to swing, resulting in misalignment of the contact surface of the moving and static contacts, thereby causing temperature rise problems and affecting product quality and service life. Summary of the invention

[0003] The purpose of the utility model is to solve the above technical problems and provide a novel plastic case circuit breaker shaft positioning device, which has a reasonable structural design and greatly improves the stability of the plastic case circuit breaker moving contact shaft.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is:

[0005] A novel plastic case circuit breaker shaft positioning device comprises a base, a shaft, a side pressure plate, a middle pressure plate and an upper cover plate. The base comprises a three-phase compartment, a large U-shaped groove is arranged between adjacent compartments, the shaft and its accessories are in active contact with the large U-shaped groove, small U-shaped grooves are arranged on the outer sides of the compartments on both sides of the base, the small U-shaped grooves are open toward the inner side and the top of the base, the bottom of the small U-shaped groove is a semicircular groove pit, bearings are connected at both ends of the shaft, the outer diameter of the bearing is the same as the width of the small U-shaped groove, slots I are arranged on two side walls of the small U-shaped groove, the side pressure plate can be inserted into the slots I, the side pressure plate is fixed in the slots after the upper cover plate is connected to the base, a U-shaped notch is arranged at the lower end of the side pressure plate, and the side pressure plate is in contact with the bearing at the end of the shaft.

[0006] The two small U-shaped grooves on the base are symmetrically arranged on both sides of the base, and the maximum distance between the groove pits of the two small U-shaped grooves is slightly larger than the length of the rotating shaft.

[0007] The width of the U-shaped notch at the lower end of the side pressure plate is the same as the width of the small U-shaped groove. After the side pressure plate is fully inserted into the slot, the two ends of the top of the side pressure plate are flush with the edge of the base, and its U-shaped notch and the small U-shaped groove form a cylindrical through hole, which is convenient for limiting the bearing of the rotating shaft.

[0008] Furthermore, a lead notch I is provided on the top of the edge pressing plate, which is a reserved hole.

[0009] Furthermore, a lead notch II is provided on the upper part of the small U-shaped groove of the base. After the upper cover plate is fixed to the base, the lead notch I and the lead notch II are convenient for installing internal accessory leads on the molded case circuit breaker.

[0010] Furthermore, the large U-shaped groove is provided with a slot II, and the medium pressure plate can be inserted into the slot II. A U-shaped notch is provided at the lower end of the medium pressure plate. After the medium pressure plate is inserted into the slot II, the U-shaped notch and the large U-shaped groove form a circular hole, which passes through the middle of the upper cover plate and the medium pressure plate limiting shaft.

[0011] The beneficial effects of the utility model are as follows: compared with the traditional molded case circuit breaker shaft positioning structure, the utility model lengthens the length of the shaft, arranges bearings at the ends of the shaft, and optimizes the structures on both sides of the base, so that the limit fixing points of the shaft mechanism and the base are increased from the original two to four, effectively solving the swing problem of the shaft caused by the closing action, and improving the service life of the entire circuit breaker product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of an embodiment of the utility model after installation;

[0014] Figure 3 This is a schematic diagram of the structure of the side pressure plate of the utility model;

[0015] Figure 4 A schematic diagram of the base structure.

[0016] 1-base, 2-rotating shaft, 3-side pressure plate, 4-large U-shaped groove, 5-small U-shaped groove, 6-slot I, 7-slot II, 8-U-shaped notch, 9-lead notch I, 10-lead notch II, 11-bearing, 12-upper cover. DETAILED DESCRIPTION

[0017] As attached Figure 1-4A novel plastic case circuit breaker shaft positioning device comprises a base 1, a shaft 2, a side pressure plate 3, a middle pressure plate, and an upper cover plate 12. The base 1 comprises a three-phase compartment, and a large U-shaped groove 4 is arranged between adjacent compartments. The shaft and its accessories are in active contact with the large U-shaped groove 4. The connection method between the shaft and the large U-shaped groove 4 of the base is the prior art and will not be described in detail. The base 1 is provided with small U-shaped grooves 5 on the outer sides of the compartments on both sides of the base 1. The small U-shaped grooves 5 are open toward the inner side and the top of the base 1. The bottom of the small U-shaped groove 5 is a semicircular groove pit. Bearings 11 are connected to both ends of the shaft 2. The outer diameter of the bearing is the same as the width of the small U-shaped groove 5. Slots Ⅰ6 are arranged on the two side walls of the small U-shaped groove 5. The side pressure plate 3 can be inserted into the slot Ⅰ6. After the upper cover plate is connected to the base 1, the side pressure plate 3 is fixed in the slot. A U-shaped notch 8 is arranged at the lower end of the side pressure plate 3. The side pressure plate 3 is in contact with the bearing at the end of the shaft.

[0018] The two small U-shaped grooves 5 on the base 1 are symmetrically arranged on both sides of the base 1, and the maximum distance between the grooves of the two small U-shaped grooves 5 is slightly larger than the length of the rotating shaft.

[0019] The width of the U-shaped notch 8 at the lower end of the side pressure plate 3 is the same as the width of the small U-shaped groove 5. After the side pressure plate 3 is fully inserted into the slot, the two ends of the top of the side pressure plate 3 are flush with the edge of the base 1, and its U-shaped notch 8 and the small U-shaped groove 5 form a cylindrical through hole, which is convenient for limiting the bearing of the rotating shaft.

[0020] Furthermore, a lead notch Ⅰ9 is provided on the top of the side pressing plate 3, which is a reserved hole.

[0021] Furthermore, a lead notch II10 is provided on the upper portion of the small U-shaped groove 5 of the base 1. After the upper cover plate is fixed to the base 1, the lead notch I9 and the lead notch II10 are convenient for installing internal accessory leads in the molded case circuit breaker.

[0022] Furthermore, the large U-shaped groove 4 is provided with a slot Ⅱ7, and the medium pressure plate can be inserted into the slot Ⅱ7. A U-shaped notch is provided at the lower end of the medium pressure plate. After the medium pressure plate is inserted into the slot Ⅱ7, its U-shaped notch and the large U-shaped groove 4 form a circular hole, passing through the middle of the upper cover plate and the medium pressure plate limiting shaft.

[0023] The bearing is a sleeve bearing.

[0024] The above is only a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principle of the present utility model. These improvements should also be regarded as within the scope of protection of the present utility model without paying creative labor.

Claims

1. A novel plastic case circuit breaker shaft positioning device, characterized in that: It includes a base, a rotating shaft, a side pressure plate, a middle pressure plate, and an upper cover plate. The base includes three-phase compartments. A large U-shaped groove is arranged between adjacent compartments. The rotating shaft and its accessories are in active contact with the large U-shaped groove. The base is provided with small U-shaped grooves on the outer sides of the compartments on both sides of the base. The small U-shaped grooves are open toward the inner side and the top of the base. The bottom of the small U-shaped groove is a semicircular groove pit. Bearings are connected at both ends of the rotating shaft. The outer diameter of the bearing is the same as the width of the small U-shaped groove. Slots I are arranged on two side walls of the small U-shaped groove. The side pressure plate can be inserted into the slot I. After the upper cover plate is connected to the base, the side pressure plate is fixed in the slot. A U-shaped notch is arranged at the lower end of the side pressure plate. The side pressure plate is in contact with the bearing at the end of the rotating shaft.

2. The novel plastic case circuit breaker shaft positioning device according to claim 1 is characterized in that: The two small U-shaped grooves on the base are symmetrically arranged on both sides of the base, and the maximum distance between the groove pits of the two small U-shaped grooves is greater than the length of the rotating shaft.

3. The novel plastic case circuit breaker shaft positioning device according to claim 1 is characterized in that: The width of the U-shaped notch at the lower end of the side pressure plate is the same as the width of the small U-shaped groove. After the side pressure plate is fully inserted into the slot, the two ends of the top of the side pressure plate are flush with the edge of the base, and its U-shaped notch and the small U-shaped groove form a cylindrical through hole, which is convenient for limiting the bearing of the rotating shaft.

4. The novel plastic case circuit breaker shaft positioning device according to claim 1 is characterized in that: A lead notch Ⅰ is arranged on the top of the edge pressure plate.

5. The novel plastic case circuit breaker shaft positioning device according to claim 1 is characterized in that: A lead wire notch II is arranged on the upper portion of the small U-shaped groove of the base.

6. The novel plastic case circuit breaker shaft positioning device according to claim 1 is characterized in that: The large U-shaped groove is provided with a slot II, and the medium pressure plate can be inserted into the slot II. The lower end of the medium pressure plate is provided with a U-shaped notch. After the medium pressure plate is inserted into the slot II, the U-shaped notch and the large U-shaped groove form a circular hole.

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