CN210575797U - A moving contact connection structure of a molded case circuit breaker - Google Patents

Abstract

A moving contact connection structure of a molded case circuit breaker is characterized by comprising a rotating shaft (1), a contact pressure spring (2), a moving contact (3), a moving contact mounting pin (4), a pressure plate mounting limit The position pin (5) and the contact pressure plate (6), the connection structure reduces the type and number of parts, changes the contact form of the contact pressure spring and the pressure plate, improves the stability of its movement, and enhances the reliability of the movement of the moving contact.

Description

A moving contact connection structure of a molded case circuit breaker

technical field

The utility model belongs to the technical field of low-voltage electrical equipment, in particular to a moving contact connecting structure of a molded case circuit breaker.

Background technique

Molded case circuit breaker is a low-voltage circuit protection device with overload, short circuit and undervoltage protection functions. There are many types of circuit breakers, among which molded case circuit breakers are more commonly used. When the current exceeds the set value, the molded case circuit breaker can automatically cut off the current to protect the load. The single breakpoint of the molded case circuit breaker is the most used form of the molded case circuit breaker products today. The contact module part, as an important part of the molded case circuit breaker, has received great attention. Among them, the reliability of the connecting device of the moving contact And good assemblability is getting more and more attention. However, the common contact modules on the market have the following defects: firstly, as shown in Figure 9, it is easy to fail during the breaking test, the failure mode is no electricity after the test, and the failure reason is that the contact spring falls off , The contact has no final pressure. The moving contact connection structure consists of the rotating shaft, the contact pressure spring, the moving contact, the moving contact mounting pin, the pressure plate mounting pin, the pressure plate limit pin, the contact pressure plate, the washer, and the retaining ring. etc. composition. The front end of the movable contact protrudes from the through hole on the rotating shaft, the rear end of the movable contact is provided with a circular hole for the installation of the movable contact mounting pin, and the lower part is provided with a mounting hole for the limit pin of the pressure plate. The limit pin is riveted with the pressure plate installation limit pin installation hole, the contact pressure plate is provided with a pressure plate installation round hole, and the pressure plate installation pin through hole is arranged under the rotating shaft, and the pressure plate installation pin passes through the rotating shaft pressure plate Mounting pin through holes and the described pressure plate mounting round holes. The inner side wall cavity of the rotating shaft is provided with a moving contact mounting pin mounting groove and a washer mounting groove, both ends of the moving contact mounting pin are provided with retaining ring mounting grooves, and both ends pass through the moving contact mounting pin mounting circle. The hole and the washer are placed in the movable contact mounting pin mounting groove, the washer is placed in the washer mounting groove, the retaining ring is inserted into the retaining ring mounting groove on both sides of the movable contact mounting pin, and the front end of the inner cavity of the rotating shaft There is a contact pressure spring installation hole groove, one end of the contact pressure spring is installed in the contact pressure spring installation hole groove, the other end is sleeved on the boss on the corresponding surface of the pressure plate, and the end face of the contact pressure spring is against the contact pressure spring. The contact pressing plate corresponds to the surface. When a short-circuit current fault occurs, the moving contact rotates up and counterclockwise with the moving contact mounting pin as the center of rotation due to the electric repulsion, and the limit pin pushes the pressure plate to apply pressure to the contact pressure spring, and the pressure spring compresses and stores energy. The mating feature of the contact pressure spring is a straight surface and an inclined surface, and the contact pressure spring is easy to fall off along the direction of the inclined surface. In the second aspect, when the pressure plate limit pin pushes the pressure plate, it should be pressed on the plane of the pressure plate, but in extreme cases, it may act on the inclined surface, causing the pressure spring to not work properly. In the third aspect, it involves many parts and requires multiple installation procedures. One end of the contact pressure spring is installed in the cylindrical groove of the rotating shaft, and then the pressure plate pin passes through the rotating shaft installation hole and the pressure plate installation hole, and the movable contact installation pin passes through the washer round hole and The circular hole of the movable contact is installed into the U-shaped groove of the rotating shaft, and then the retaining ring is installed into the limit pin groove of the pressure plate. The whole process of assembly is difficult and complicated.

Utility model content

The purpose of the present utility model is to provide a moving contact connection structure of a molded case circuit breaker in view of the above-mentioned technical defects of the existing moving contacts being difficult to install, complex in structure and poor in installation stability, reducing the types and number of parts, changing the The contact form between the contact pressure spring and the pressure plate improves the stability of its movement and enhances the reliability of the movement of the moving contact.

Technical solutions

In order to achieve the above technical purpose, the utility model provides a moving contact connection structure of a molded case circuit breaker, which is characterized in that it includes a rotating shaft, a contact pressure spring, a moving contact, a moving contact mounting pin, and a pressure plate mounting limit pin and contact pressure plate, the front end of the movable contact protrudes from the through hole on the rotating shaft, the rear end of the movable contact is provided with a circular hole for the installation of the movable contact mounting pin, and the lower part is provided with a pressure plate installation limit Position pin installation hole, the contact pressure plate is provided with a pressure plate installation limit pin limit hole, and the pressure plate installation limit pin passes through the pressure plate installation limit pin limit hole and the pressure plate installation limit pin installation hole to make The contact pressure plate is installed at the rear end of the movable contact, the inner cavity wall of the rotating shaft is provided with a movable contact installation pin installation groove, and the two ends of the movable contact installation pin pass through the movable contact installation pin for installation The circular hole is placed in the movable contact mounting pin mounting groove, the front end of the inner cavity of the rotating shaft is provided with a contact pressure spring mounting hole groove, one end of the contact pressure spring is installed in the contact pressure spring mounting hole groove, and the other side is installed in the contact pressure spring mounting hole groove. One end bears against the corresponding surface of the contact pressure plate, and the pressure plate installation limit pin bears against the vertical surface of the contact pressure plate.

Preferably, a movable contact is provided on the front end of the movable contact passing through the through hole on the rotating shaft.

Preferably, the movable contact mounting pin mounting groove on the rotating shaft is a U-shaped groove, and the opening direction of the U-shaped groove is downward.

Preferably, the limit hole for the limit pin for installing the pressure plate is a U-shaped hole.

Preferably, the corresponding surfaces of the contact pressure plate and the contact pressure spring are C-shaped.

Further, the corresponding surface of the contact pressure plate is provided with a cylindrical boss, and the other end of the contact pressure spring is sleeved on the cylindrical boss.

beneficial effect

The utility model provides a moving contact connection structure of a molded case circuit breaker, which adopts a C-shaped matching shape of the pressure plate and the contact spring to replace the previous structure with a straight face and an inclined surface, so as to prevent the contact pressure spring from falling off; the pressure plate limit pin The pressure plate is installed with the limit pin limit hole to limit the position, so that the pressure plate limit pin always acts on the vertical surface corresponding to the pressure plate during the movement process; at the same time, the use of the rotating shaft, the pressure plate and the pressure plate pin achieves the purpose of reducing the types of parts and the number of parts .

Description of drawings

1 is a schematic structural diagram of an embodiment of the present invention.

Figure 2 is an exploded view of an embodiment of the present invention.

3 is a schematic diagram of the structure of the rotating shaft in the embodiment of the present invention.

FIG. 4 is a schematic diagram of the structure of the movable contact in the embodiment of the present invention.

5 is a schematic diagram of the structure of the contact pressure spring in the embodiment of the present invention.

6 is a schematic diagram of the structure of the movable contact mounting pin in the embodiment of the present invention.

FIG. 7 is a schematic diagram of the structure of the limit pin for the pressure plate installation in the embodiment of the present invention.

Fig. 8a is a schematic diagram 1 of the structure of the contact pressure plate in the embodiment of the present invention.

Figure 8b is a second schematic view of the structure of the contact pressure plate in the embodiment of the present invention.

FIG. 9 is a schematic diagram of an exploded structure of the existing moving contact connection structure.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Example

As shown in Figures 1 and 2, a moving contact connection structure of a molded case circuit breaker includes a rotating shaft 1, a contact pressure spring 2, a moving contact 3, a moving contact mounting pin 4, and a pressure plate mounting limit pin 5 and the contact pressure plate 6, the front end of the movable contact 3 protrudes from the through hole 1a on the rotating shaft 1, and the front end of the movable contact 3 passing through the through hole 1a on the rotating shaft 1 is provided with moving contact 7. As shown in FIG. 4 , the rear end of the movable contact 3 is provided with a movable contact mounting pin mounting hole 301 , and a pressure plate mounting limit pin mounting hole 302 is provided below. As shown in FIG. 8 , the The contact pressure plate 6 is provided with a limit hole 601 for the limit pin for mounting the pressure plate. In this embodiment, the limit hole 601 for the limit pin for the pressure plate installation is preferably a U-shaped hole.

As shown in Figures 1 , 2 , 8a and 8b, the pressure plate installation limit pin 5 passes through the pressure plate installation limit pin limit hole 601 and the pressure plate installation limit pin installation hole 302 to make the contact pressure plate 6 Installed at the rear end of the movable contact 3 , the pressure plate installation limit pin 5 bears against the vertical surface 604 of the contact pressure plate 6 .

As shown in FIG. 3 , a moving contact mounting pin mounting groove 101 is provided on the inner cavity wall of the rotating shaft 1. In this embodiment, the moving contact mounting pin mounting groove 101 is a U-shaped groove, and the opening direction of the U-shaped groove is toward Down.

As shown in FIGS. 1 , 2 , 5 and 6 , both ends of the moving contact mounting pin 4 pass through the moving contact mounting pin mounting circular hole 301 and are placed in the moving contact mounting pin mounting groove 101 The front end of the inner cavity of the rotating shaft 1 is provided with a contact pressure spring installation hole groove 102, one end of the contact pressure spring 2 is installed in the contact pressure spring installation hole groove 102, and the other end is sleeved on the contact pressure plate 6 corresponding to The cylindrical boss 602 on the surface and the end surface of the contact pressure spring 2 bear against the corresponding surface 603 of the contact pressure plate 6 .

In this embodiment, the corresponding surfaces 603 of the contact pressure plate 6 and the contact pressure spring 2 are C-shaped.

The advantages of the structure of the present embodiment compared with the products in the prior art are: the matching shape of the pressure plate and the contact spring is a C shape instead of the previous structure with a straight face and a slope, the contact form of the pressure plate limit pin and the pressure plate is line contact, and During the exercise, the motion trajectory curve is gentle. At the same time, the use of the rotating shaft, the pressure plate and the pressure plate pin achieves the purpose of reducing the types of parts and the number of parts.

Claims (6)

1. A moving contact connection structure of a molded case circuit breaker, characterized in that it comprises a rotating shaft (1), a contact pressure spring (2), a moving contact (3), a moving contact mounting pin (4), a pressure plate Install the limit pin (5) and the contact pressure plate (6), the front end of the movable contact (3) passes through the through hole (1a) on the rotating shaft (1), the movable contact (3) A moving contact mounting pin mounting hole (301) is arranged above the rear end of the contactor, a pressure plate mounting limit pin mounting hole (302) is arranged below, and the contact pressure plate (6) is provided with a pressure plate mounting limit pin to limit the position A hole (601), the pressure plate installation limit pin (5) passes through the pressure plate installation limit pin limit hole (601) and the pressure plate installation limit pin installation hole (302) so that the contact pressure plate (6) It is installed at the rear end of the moving contact (3), the inner cavity wall of the rotating shaft (1) is provided with a moving contact mounting pin mounting groove (101), and the two ends of the moving contact mounting pin (4) pass through the hole. The moving contact mounting pin mounting hole (301) is placed in the moving contact mounting pin mounting groove (101), and the front end of the inner cavity of the rotating shaft (1) is provided with a contact pressure spring mounting hole groove (102), One end of the contact pressure spring (2) is installed in the installation hole groove (102) of the contact pressure spring, and the other end bears against the corresponding surface (603) of the contact pressure plate (6), and the pressure plate is installed with a limit pin (5). ) against the vertical surface (604) of the contact pressure plate (6). 2 . The moving contact connecting structure of a molded case circuit breaker according to claim 1 , wherein the moving contact ( 3 ) passes through the through hole ( 1 a ) on the rotating shaft ( 1 ). 3 . A movable contact (7) is arranged on the front end of the . 3. The moving contact connecting structure of a molded case circuit breaker according to claim 1, characterized in that: the moving contact mounting pin mounting groove (101) on the rotating shaft (1) is a U-shaped groove, and U The groove opening direction is downward. 4 . The movable contact connection structure of a molded case circuit breaker according to claim 1 , wherein the limit hole ( 601 ) of the pressure plate mounting limit pin is a U-shaped hole. 5 . 5. The movable contact connection structure of a molded case circuit breaker according to claim 1, wherein the corresponding surface (603) of the contact pressure plate (6) and the contact pressure spring (2) is C shape. 6 . The moving contact connection structure of a molded case circuit breaker according to claim 1 , wherein the corresponding surface ( 603 ) of the contact pressure plate ( 6 ) is provided with a cylindrical boss ( 602 ), which contacts the The other end of the head compression spring (2) is sleeved on the cylindrical boss (602).

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