CN211455635U

CN211455635U - Thermal tripping structure of circuit breaker

Info

Publication number: CN211455635U
Application number: CN202020450539.8U
Authority: CN
Inventors: 刘曙彬; 胡昌勇; 高柏勇; 罗胜; 高磊啸
Original assignee: Zhejiang Tengen Electric Co Ltd
Current assignee: Zhejiang Tengen Electric Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-09-08
Anticipated expiration: 2030-03-31

Abstract

The utility model discloses a thermal tripping structure of a circuit breaker, which is convenient to process and form by arranging a notch structure on a heating element and directly turning a fixing plate outwards from the side edge of the notch structure, the installation and fixation of the heating element and the breaker shell are realized through the fixing plate, the sectional area of the heating element can be effectively reduced through the notch structural design, and according to the fixed plate with the connecting plate homonymy sets up on heating element, reduces on the whole heating element's installation distance, can also avoid the mounted position of bimetallic strip to take place the antedisplacement phenomenon, adopts the thermal trip structure of this technical scheme, can reduce heating element occupies the inside installation space of circuit breaker, can improve again heating element's rate of generating heat guarantees that the bimetallic strip triggers in the stipulated time, realizes the thermal overload protection function.

Description

Thermal tripping structure of circuit breaker

Technical Field

The utility model relates to a circuit breaker technical field, concretely relates to circuit breaker thermal tripping structure.

Background

The thermomagnetic trip provides both magnetic protection and thermal protection, i.e., overload protection. And (4) thermal protection, wherein when current passes through the release, a thermal element generates heat (the direct-heating current directly passes through the bimetallic strip), the bimetallic strip is heated and deformed, and when the bimetallic strip is deformed to a certain degree, the traction rod is struck so as to drive the mechanism to act and cut off a circuit.

Chinese patent document CN204011319U discloses a thermal trip element of a circuit breaker, which comprises a heating element, a connecting plate, a bracket and a bimetallic strip; the support is fixed on the connecting plate, and the bottom end of the bimetallic strip is fixedly connected with the heating element; the connecting plate the integrative stamping forming of heating element, the last flexion that is equipped with "n" font of heating element, the bottom of bimetallic strip with flexion welded fastening, heating element's one end with the connecting plate links to each other, and its other end extends to the connecting plate dorsad and is provided with the fixed orifices, is fixed in the circuit breaker heating element through the fixed orifices.

According to the structure of the thermal trip element of the circuit breaker, the connecting plate and the fixing hole are oppositely arranged at two ends of the heating element, so that the installation distance of the heating element is increased on the whole, the heating element occupies a larger space in the circuit breaker, the sectional area of the heating element designed by the structure is larger, the heating speed is relatively slow, and the triggering speed of the bimetallic strip in a specified time can be influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming heating element's among the prior art installation distance is big, and it is big to occupy circuit breaker internally mounted space to and heating element's the speed of generating heat is slower, influences the problem of bimetallic strip trigger speed, thereby provides a heating element's installation distance is little, and it is little to occupy circuit breaker installation space, and the speed of generating heat is fast, and the bimetallic strip triggers the fast circuit breaker thermal tripping structure of speed.

The utility model provides a hot trip gear of circuit breaker installs in the circuit breaker casing, including heating element, and set up respectively the connecting plate and the bimetallic strip of heating element both sides, the bimetallic strip with the installation of heating element syntropy extension, a notch structure has been seted up on the heating element, and by the side of notch structure is used for fixed connection to the roll-over shaping play of turning up the fixed plate of circuit breaker casing, the fixed plate with the connecting plate homonymy sets up.

In the thermal tripping structure of the circuit breaker, the top end of the heating element is bent and formed into a U-shaped connecting part, and the connecting plate is connected to the connecting part and vertically staggered with the fixing plate in parallel.

In the thermal tripping structure of the circuit breaker, the connecting part is provided with an L-shaped limiting table, and the connecting plate is arranged in the L-shaped limiting table in a limiting manner.

In foretell circuit breaker thermal tripping structure, the fixed plate with be equipped with fixed knot between the circuit breaker casing constructs, fixed knot constructs including setting up boss in the circuit breaker casing with set up in the through-hole of boss, and correspond the setting and be in screw hole on the fixed plate passes through the fastener the through-hole is fixed in the screw hole.

In the thermal trip structure of the circuit breaker, the fixing plate is arranged close to the bottom end of the heating element and matched with the notch structure in shape.

In the above thermal trip structure of the circuit breaker, one end of the bimetal is a contact end fixed to the bottom end of the heating element, and the other end of the bimetal is a free end bent away from one side of the connecting part when heated.

In the above thermal trip structure of the circuit breaker, the connecting plate is mounted in the wiring port of the circuit breaker case through a positioning structure.

In foretell circuit breaker thermal tripping structure, location structure is including setting up the spacing sand grip of wiring port both sides lateral wall, and correspond the setting and be in on the connecting plate and with two spacing protruding strip cooperation counterbalance spacing arch.

In the above thermal trip structure of the circuit breaker, the positioning structure further comprises a positioning plate inserted in the wiring port, a positioning hole arranged on the positioning plate, and a positioning column arranged at the bottom of the connecting plate and suitable for being inserted into the positioning hole.

In foretell circuit breaker thermal tripping structure, still include the fastening wear to establish the connecting plate circuit breaker casing with bolt assembly between the locating plate.

Compared with the prior art, the technical scheme of the utility model have the following advantage:

1. the thermal tripping structure of the circuit breaker provided by the utility model is convenient to machine and form by arranging a notch structure on the heating element and directly turning the side edge of the notch structure outwards to form a fixed plate, and realizes the installation and fixation of the heating element and the circuit breaker shell through the fixed plate, the sectional area of the heating element can be effectively reduced by the notch structure design, and according to the fixed plate with the connecting plate homonymy sets up on heating element, reduces on the whole heating element's installation distance, can also avoid the mounted position of bimetallic strip to take place the antedisplacement phenomenon, adopts the thermal trip structure of this technical scheme, can reduce heating element occupies the inside installation space of circuit breaker, can improve again heating element's rate of generating heat guarantees that the bimetallic strip triggers in the stipulated time, realizes the thermal overload protection function.

2. The utility model provides a hot dropout structure of circuit breaker, be equipped with the spacing platform of L type on the connecting portion, do the connecting plate provides the mounted position, the connecting plate spacing install in the spacing platform of L type is right through the spacing platform of L type the connecting plate plays spacing installation effect, can avoid the position shift takes place for the connecting plate, spacing platform with the connecting plate can adopt multiple connected modes such as bolted connection, riveting or welding to connect fixedly.

3. The utility model provides a hot trip gear of circuit breaker, the fixed plate is close to heating element's bottom sets up, and with the shape phase-match of incision structure, through the above-mentioned structure setting can know, the fixed plate is just by the direct blanking of original entity part in the incision structure shaping of bending, its simple structure, and the manufacturing is convenient, and the syntropy extension installation of satisfying heating element and bimetallic strip at circuit breaker casing that can be better need not to go another fixed support piece of welding again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below.

Fig. 1 is a schematic view of an installation structure of a thermal trip structure of a circuit breaker according to the present invention;

fig. 2 is a schematic view illustrating a connection structure of the connection plate, the heating element and the bimetal shown in fig. 1;

FIG. 3 is a schematic diagram of a specific structure of the heating element shown in FIG. 1;

fig. 4 is a cross-sectional view of the thermal trip structure of the circuit breaker mounted on the housing provided by the present invention;

FIG. 5 is a schematic view of the connection plate and the positioning plate shown in FIG. 1 mounted on the housing;

description of reference numerals:

1-a circuit breaker housing; 11-a boss; 12-a patch port; 13-positioning plate; 14-positioning holes; 15-limiting convex strips;

2-a heating element; 21-a notch structure; 22-a fixing plate; 23-a connecting part; 24-a limit station;

3-connecting the plates; 31-a locating post; 32-a limit protrusion;

4-bimetallic strip; 41-a contact end; 42-free end;

5-a fixed structure; 51-a through hole; 52-a threaded hole; 53-fasteners;

6-bolt assembly.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

The present embodiment is described in detail below with reference to the accompanying drawings:

the utility model provides a as shown in fig. 1-5 circuit breaker thermal tripping structure installs in circuit breaker casing 1, including heating element 2, and set up respectively connecting plate 3 and bimetallic strip 4 of heating element 2 both sides, bimetallic strip 4 with the installation of heating element 2 syntropy extension, a notch structure 21 has been seted up on heating element 2, and by notch structure 21's side is used for fixed connection to the roll-over shaping play of turning up fixed plate 22 of circuit breaker casing 1, fixed plate 22 with 3 homonymies of connecting plate set up.

The above embodiment is the core technical solution of this embodiment, a notch structure 21 is provided on the heating element 2, and a fixing plate 22 is folded outwards from the side edge of the notch structure 21, so that the processing and the forming are convenient, the fixing plate 22 is used to realize the mounting and fixing of the heating element 2 and the circuit breaker housing 1, the notch structure 21 can effectively reduce the sectional area of the heating element 2, and is arranged on the heating element 2 on the same side of the fixing plate 22 and the connecting plate 3, so as to reduce the mounting distance of the heating element 2 as a whole, and avoid the forward movement of the mounting position of the bimetal 4, and by adopting the thermal trip structure of this technical solution, the mounting space occupied by the heating element 2 inside the circuit breaker can be reduced, the heating speed of the heating element 2 can be increased, and the bimetal 4 can be triggered within a specified time, realize hot overload protection function, it is further preferred, fixed plate 22 is close to heating element 2's bottom sets up, and with the shape phase-match of incision structure 21, through above-mentioned structural setting can know, fixed plate 22 is just by the direct blanking of the original entity part in the incision structure 21 shaping of bending, its simple structure, and production manufacturing is convenient, and the syntropy extension installation that satisfies heating element 2 and bimetallic strip 4 that can be better at circuit breaker casing 1 need not to go another welding fixed support piece again.

As shown in fig. 2, the top end of the heating element 2 is bent to form a U-shaped connecting portion 23, the connecting plate 3 is connected to the connecting portion 23 and is arranged in a vertically parallel staggered manner on the fixing plate 22, the U-shaped connecting portion 23 is bent and retracted for a brass bracket installed on the circuit breaker, and the connecting plate 3 and the fixing plate 22 are installed in a staggered manner in the height direction to avoid installation position interference in the circuit breaker housing 1, so that the installation is convenient.

As shown in fig. 3, an L-shaped limit platform 24 is disposed on the connecting portion 23 to provide an installation position for the connecting plate 3, the connecting plate 3 is installed in the L-shaped limit platform 24 in a limited manner, the L-shaped limit platform 24 plays a role in limiting and installing the connecting plate 3, so that the connecting plate 3 can be prevented from shifting, the limit platform 24 and the connecting plate 3 can be connected and fixed by using various connection methods such as bolt connection, riveting or welding, and in this embodiment, the connecting plate 3 is welded and fixed on the limit platform 24.

In order to prevent the heat generating component 2 from displacing on the circuit breaker housing 1, a fixing structure 5 is arranged between the fixing plate 22 and the circuit breaker housing 1, the fixing structure 5 comprises a boss 11 arranged in the circuit breaker housing 1, a through hole 51 arranged on the boss 11, and a threaded hole 52 correspondingly arranged on the fixing plate 22, and a fastening member 53 penetrates through the through hole 51 and is fixed in the threaded hole 52, so that a fastening force is applied to the fixing plate 22 and the circuit breaker housing 1, and the fixing plate 22 and the circuit breaker housing 1 are kept fixed in relative positions.

As shown in fig. 2 and 4, one end of the bimetal 4 is a contact end 41 fixed to the bottom end of the heating element 2, and the other end is a free end 42 bent to the side away from the connecting portion 23, in this embodiment, the contact end 41 is welded to the bottom end of the heating element 2, and the free end 42 is provided with an adjustable bolt, so that the contact distance between the free end 42 and a draw bar of the circuit breaker can be adjusted.

As a preferred embodiment, the connection plate 3 is installed in the connection port 12 of the circuit breaker housing 1 by a positioning structure, and the installation position of the connection plate 3 is prevented from being shifted, so that the bolt installation holes in the connection plate 3 and the connection port 12 are aligned, and the installation efficiency is improved.

The specific structure of the positioning structure is described in detail below with reference to fig. 2-3 and 5:

as shown in fig. 5, the positioning structure includes a limiting protruding strip 15 disposed on the side wall of the two sides of the connection port 12 and a corresponding limiting protrusion 32 disposed on the connection plate 3 and abutted to the limiting protruding strip 15, so as to avoid the connection plate 3 from shaking in the connection port 12, and at the same time, the distance between the limiting protrusions 32 is greater than the width of the limiting table 24, so as to provide position indication for the connection plate 3 and the welding of the limiting table 24.

In order to further improve the installation limiting effect of the connecting plate 3, the positioning structure further comprises a positioning plate 13 inserted in the wiring port 12, a positioning hole 14 arranged on the positioning plate 13, and a positioning column 31 arranged at the bottom of the connecting plate 3 and suitable for being inserted into the positioning hole 14, as shown in fig. 5 a, the wiring port 12 is provided with a clamping groove, the positioning plate 13 is horizontally inserted in the clamping groove, and through the insertion matching of the positioning column 31 and the positioning hole 14, the positioning plate 13 can be prevented from being separated from the clamping groove, the horizontal displacement of the connecting plate 3 in the wiring port 12 can be limited, the structure is simple, and the installation is reliable.

As a preferred embodiment, the thermal trip structure of the circuit breaker further includes a bolt assembly 6 fastened and penetrated between the connecting plate 3, the circuit breaker housing 1 and the positioning plate 13, and an external circuit of the circuit breaker can be electrically connected with the thermal trip structure of the circuit breaker through the bolt assembly 6.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A thermal tripping structure of a circuit breaker is arranged in a circuit breaker shell (1) and comprises a heating element (2), and a connecting plate (3) and a bimetallic strip (4) which are respectively arranged at two sides of the heating element (2), wherein the bimetallic strip (4) and the heating element (2) extend in the same direction, and the thermal tripping structure is characterized in that the heating element (2) is provided with a notch structure (21), a fixing plate (22) for fixedly connecting the circuit breaker shell (1) is formed by outwards folding the side edge of the notch structure (21), and the fixing plate (22) and the connecting plate (3) are arranged at the same side.

2. The thermal trip structure of circuit breaker according to claim 1, wherein the top end of the heating element (2) is bent to form a U-shaped connecting portion (23), and the connecting plate (3) is connected to the connecting portion (23) and vertically offset from the fixing plate (22).

3. The thermal tripping structure of the circuit breaker according to claim 2, wherein an L-shaped limit table (24) is arranged on the connecting part (23), and the connecting plate (3) is limited and mounted on the L-shaped limit table (24).

4. The thermal trip structure of circuit breaker according to claim 2 or 3, characterized in that a fixing structure (5) is provided between the fixing plate (22) and the circuit breaker housing (1), the fixing structure (5) comprises a boss (11) provided in the circuit breaker housing (1) and a through hole (51) provided in the boss (11), and a threaded hole (52) correspondingly provided on the fixing plate (22), and is fixed in the threaded hole (52) through the through hole (51) by a fastening member (53).

5. The thermal trip structure of circuit breaker according to claim 4, characterized in that said fixing plate (22) is arranged close to the bottom end of said heating element (2) and matches the shape of said cutout structure (21).

6. The thermal trip structure of circuit breaker according to claim 5, wherein said bimetal (4) has one end thereof being a contact end (41) fixed to the bottom end of said heating element (2) and the other end thereof being a free end (42) bent away from the side of said connecting portion (23) heated.

7. Circuit breaker thermal trip arrangement according to any of the claims 5-6, characterized in that the connection plate (3) is mounted in the connection port (12) of the circuit breaker housing (1) by means of a positioning structure.

8. The thermal trip structure of circuit breaker according to claim 7, wherein said positioning structure comprises a limit protrusion (15) disposed on both side walls of said connection port (12), and a limit protrusion (32) correspondingly disposed on said connecting plate (3) and engaged with and abutted against said limit protrusions (15).

9. The thermal trip structure of circuit breaker according to claim 8, wherein said positioning structure further comprises a positioning plate (13) inserted into said connection port (12), a positioning hole (14) provided on said positioning plate (13), and a positioning post (31) provided at the bottom of said connection plate (3) and adapted to be inserted into said positioning hole (14).

10. The thermal trip structure of circuit breaker according to claim 9, further comprising a bolt assembly (6) fastened through between said connection plate (3), said circuit breaker case (1) and said positioning plate (13).