CN213752579U

CN213752579U - Plastic case circuit breaker

Info

Publication number: CN213752579U
Application number: CN202120117886.3U
Authority: CN
Inventors: 黄剑; 晏卫江; 顾建青
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-07-20
Anticipated expiration: 2031-01-15

Abstract

A molded case circuit breaker belongs to the technical field of low-voltage electrical appliances. Comprises a shell; a draw bar for driving the brake separating operation mechanism to act; an operating mechanism first bracket plate and an operating mechanism second bracket plate for supporting the operating mechanism in a face-to-face positional relationship with each other; a articulated shaft for with the first bracket board of traction lever and operating device and second bracket board articulated, characteristics: and a limiting part for limiting the end part of the traction rod or the end part of the hinged shaft to prevent the traction rod from shaking in the radial direction is formed on the shell and at the position corresponding to the end parts of the two ends of the traction rod. The advantages are that: the situation that the traction rod radially shakes back and forth after being assembled can be avoided, and the consistency of overload and short-circuit protection characteristics is guaranteed.

Description

Plastic case circuit breaker

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to moulded case circuit breaker.

Background

Circuit breakers are switching devices in low-voltage distribution networks which protect circuits and consumers, more precisely, the circuit breakers provide overload and short-circuit protection for the lines. The molded case circuit breaker is one of the circuit breaker categories, and the draw bar is installed on the operating mechanism, and is a part for connecting the lock catch in the operating mechanism of the circuit breaker, so that the draw bar is responsible for unlocking the operating mechanism. When the line has overload or short circuit fault, the draw bar is pushed to unlock the operating mechanism and cut off the main circuit, so as to protect the line and the electric facilities.

The conventional way of positioning the above-mentioned tow bar is to place it directly on the two bracket plates of the operating mechanism facing each other, for example by means of a through-shaft or by means of screws, between the two bracket plates. However, due to the structural limitation of the circuit breaker operating mechanism, the distance between the two support plates of the structural system of the operating mechanism is short (i.e., the distance is short), so that the positioning hole for installing the draw bar on the support plate is close, and the draw bar is often shaken in the front-back radial direction after being installed. The consistency of overload and short-circuit protection characteristics is affected, and the consistency requirements of overload and short-circuit protection expected in the industry are difficult to meet or even cannot be met. In view of the foregoing, there is a need for improvement, and the technical solutions described below are made in this context.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a help avoiding the traction lever to radially rock and can ensure the moulded case circuit breaker to transship and the uniformity of short-circuit protection characteristic around appearing after the assembly.

The utility model discloses a molded case circuit breaker, which comprises a case body; a draw bar for driving the brake separating operation mechanism to act; an operating mechanism first bracket plate and an operating mechanism second bracket plate for supporting the operating mechanism in a face-to-face positional relationship with each other; the hinge shaft is used for hinging the draw bar with the first bracket plate and the second bracket plate of the operating mechanism, and is characterized in that a limiting part for limiting the end part of the draw bar or the end part of the hinge shaft and preventing the draw bar from shaking radially is formed on the shell and at the position corresponding to the end parts of the two ends of the draw bar.

In a specific embodiment of the present invention, a traction rod self-pivoting support flange perpendicular to the end surface is formed on both end surfaces of the traction rod and at a central position of the end surfaces, and the traction rod self-pivoting support flange is pivotally engaged with the limiting portion.

In another specific embodiment of the present invention, a hinge shaft through hole is formed on the traction rod, the hinge shaft passes through the hinge shaft hole and both ends of the hinge shaft are matched with the limiting portion.

In a further specific embodiment of the present invention, a first brace plate engaging groove is formed on the drawbar and at a position corresponding to the first brace plate of the operating mechanism, and a second brace plate engaging groove is formed at a position corresponding to the second brace plate of the operating mechanism, the first brace plate of the operating mechanism engages with the first brace plate engaging groove, and the second brace plate of the operating mechanism engages with the second brace plate engaging groove.

In another specific embodiment of the present invention, the first support plate of the operating mechanism is provided with a first support plate hinge seat, a first support plate hinge seat hole corresponding to the hinge shaft hole is formed at a position corresponding to the hinge shaft hole, a second support plate hinge seat is formed at a position corresponding to the hinge shaft hole on the second support plate of the operating mechanism, and a second support plate hinge seat is formed at a position corresponding to the hinge shaft hole, and a second support plate hinge seat hole corresponding to the hinge shaft hole is formed at a position corresponding to the hinge shaft hole on the second support plate hinge seat hole.

In yet another specific embodiment of the present invention, the housing is configured as a housing of a base of the circuit breaker, a side plate is configured on the housing and on one side having the limiting portion, and the limiting portion is provided on the side plate.

In a more specific embodiment of the present invention, a baffle is respectively formed on the housing and located in front of and behind the housing, and after the housing is engaged with the base, the transmission mechanism, the arc extinguishing chamber and the release of the circuit breaker are isolated from each other by the baffle.

In yet another specific embodiment of the present invention, the limiting portion is a groove or a hole.

The technical scheme provided by the utility model the technical effect lie in: the limiting parts for limiting the end parts of the traction rods or limiting the end parts of the hinged shafts are formed on the shell and at the positions corresponding to the end parts of the two ends of the traction rods, so that the condition that the traction rods radially shake back and forth after being assembled can be avoided, and the consistency of overload and short-circuit protection characteristics is guaranteed.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention.

Fig. 2 is a detailed structural view of the drawbar shown in fig. 1.

Fig. 3 is a detailed structural view of the first and second cradling plates of the operating mechanism shown in fig. 1.

Fig. 4 is a schematic view showing that both ends of the drawbar shown in fig. 1 are directly engaged with the limiting parts on the housing.

Fig. 5 is a schematic view showing that both ends of a hinge shaft for hinging the drawbar with the first bracket plate and the second bracket plate of the operating mechanism shown in fig. 1 are engaged with the stopper.

Fig. 6 is a schematic view of fig. 5 after assembly is complete.

Detailed Description

Example 1:

referring to fig. 1-4, there is shown: a housing 5; a draw bar 1 for driving the brake separating operation mechanism to act; an operating mechanism first carriage plate 2 and an operating mechanism second carriage plate 3 for supporting the operating mechanism in a face-to-face positional relationship with each other; and the hinge shaft 4 is used for hinging the traction rod 1 with the first bracket plate 2 and the second bracket plate 3 of the operating mechanism.

As the technical scheme provided by the utility model: a stopper 51 for stopping the end of the drawbar 1 or the end of the hinge shaft 4 to prevent the drawbar 1 from radially wobbling is formed at a position corresponding to both ends of the drawbar 1 in the housing 5.

As shown in fig. 4, a drawbar self-pivoting support flange 12 perpendicular to the end surface is formed at the end surface of each end of the drawbar 1 and at the center of the end surface, and the drawbar self-pivoting support flange 12 is pivotally engaged with the stopper 51, so that the drawbar 1 is directly pivotally supported by the housing 5 in this embodiment.

The drawbar 1 is provided with a hinge shaft through hole 11.

As shown in fig. 2, a first bracket plate fitting groove 13 is formed in the drawbar 1 at a position corresponding to the first bracket plate 2 of the operating mechanism, and a second bracket plate fitting groove 14 is formed at a position corresponding to the second bracket plate 3 of the operating mechanism, the first bracket plate 2 of the operating mechanism is fitted in the first bracket plate fitting groove 13, and the second bracket plate 3 of the operating mechanism is fitted in the second bracket plate fitting groove 14.

A first frame plate hinge seat 21 is formed on the first frame plate 2 of the operating mechanism at a position corresponding to the drawbar 1, a first frame plate hinge seat shaft hole 211 is formed on the first frame plate hinge seat 21 at a position corresponding to the hinge shaft through hole 11, a second frame plate hinge seat 31 is formed on the second frame plate 3 of the operating mechanism at a position corresponding to the drawbar 1, a second frame plate hinge seat shaft hole 311 is formed on the second frame plate hinge seat 31 at a position corresponding to the hinge shaft through hole 11, and the hinge shaft 4 passes through the first frame plate hinge seat shaft hole 211 and the second frame plate hinge seat shaft hole 311 and is hinged with the first frame plate 2 of the operating mechanism and the second frame plate 3 of the operating mechanism.

The case 5 is a housing of a base 6 of a circuit breaker, a side plate is formed on the case 5 on the side having the stopper portion 51, and the stopper portion 51 is opened on the side plate.

Referring to fig. 4 in conjunction with fig. 1, a blocking plate is formed on the housing 5 and located in front of and behind the housing 5, and after the housing 5 is engaged with the base 6, the transmission mechanism, the arc extinguishing chamber and the trip unit of the circuit breaker are isolated from each other by the blocking plate.

The stopper 51 may be a groove or a hole.

As is clear from the above description, the aforementioned limiting portion 51 can also be transferred to the base 6, that is, if a base limiting portion equivalent to the limiting portion 51 and having the same function is formed on the base 6 and at a position corresponding to the two end portions of the aforementioned drawbar 1, it should be considered as an equivalent technical means and still fall within the technical scope of the present invention.

Example 2:

referring to fig. 5 to 6, the hinge shaft 4 passes through the hinge shaft hole 11 and both ends of the hinge shaft 4 are engaged with the limiting portion 51, so that the purpose of preventing the drawbar 1 from shaking in the front-rear radial direction after assembly is achieved by the engagement of the hinge shaft 4 and the limiting portion 51. The rest is the same as described in example 1.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims

1. A molded case circuit breaker, characterized by comprising a case (5); a draw bar (1) for actuating the operating mechanism; an operating mechanism first bracket plate (2) and an operating mechanism second bracket plate (3) for supporting the operating mechanism in a face-to-face positional relationship with each other; and a hinged shaft (4) for hinging the traction rod (1) with the first bracket plate (2) of the operating mechanism and the second bracket plate (3) of the operating mechanism, wherein a limiting part (51) for limiting the end part of the traction rod (1) or the end part of the hinged shaft (4) to prevent the traction rod (1) from radially swinging is formed on the shell (5) and at the position corresponding to the end parts of the two ends of the traction rod (1).

2. A molded case circuit breaker according to claim 1, wherein a pull rod self-pivoting support flange (12) perpendicular to the end surface is formed on both end surfaces of the pull rod (1) at a central position of the end surface, the pull rod self-pivoting support flange (12) being pivotally engaged with the stopper portion (51).

3. A molded case circuit breaker according to claim 1, wherein a hinge shaft through hole (11) is formed at the draw bar (1), the hinge shaft (4) passes through the hinge shaft through hole (11) and both ends of the hinge shaft (4) are engaged with the stopper portion (51).

4. A molded case circuit breaker according to claim 1, wherein a first holder plate fitting groove (13) is formed on said drawbar (1) at a position corresponding to said first holder plate (2) of the operating mechanism, and a second holder plate fitting groove (14) is formed at a position corresponding to said second holder plate (3) of the operating mechanism, the first holder plate (2) of the operating mechanism is fitted in the first holder plate fitting groove (13), and the second holder plate (3) of the operating mechanism is fitted in the second holder plate fitting groove (14).

5. A molded case circuit breaker according to claim 3, wherein a first cradle plate hinge seat (21) is formed on the operating mechanism first cradle plate (2) at a position corresponding to the draw bar (1), a first cradle plate hinge seat shaft hole (211) is formed on the first cradle plate hinge seat (21) at a position corresponding to the hinge shaft through hole (11), a second cradle plate hinge seat (31) is formed on the operating mechanism second cradle plate (3) at a position corresponding to the draw bar (1), a second cradle plate hinge seat shaft hole (311) is formed on the second cradle plate hinge seat (31) at a position also corresponding to the hinge shaft through hole (11), and the hinge shaft (4) passes through the first cradle plate hinge seat shaft hole (211) and the second cradle plate hinge seat shaft hole (311) to be hinged to the operating mechanism first cradle plate (2) and the operating mechanism second cradle plate (3).

6. A molded case circuit breaker according to claim 1, characterized in that said case (5) is constituted as a cover of a base (6) of the circuit breaker, a side plate is constituted on said case (5) and on a side having said limiting portion (51), and the limiting portion (51) is opened on the side plate.

7. A molded case circuit breaker according to claim 6, characterized in that a blocking plate is formed on the case (5) in front and at the rear of the case (5), and a transmission mechanism, an arc extinguishing chamber and a trip unit of the circuit breaker are isolated from each other by the blocking plate after the case (5) is fitted to the base (6).

8. A molded case circuit breaker according to claim 1, wherein said position-limiting portion (51) is a groove or a hole.