CN218385091U

CN218385091U - Single-frame low-voltage frame circuit breaker

Info

Publication number: CN218385091U
Application number: CN202222315329.XU
Authority: CN
Inventors: 李兴伟; 郑荣; 陈建华; 张华夏
Original assignee: Eaton Electric Ltd
Current assignee: Eaton Electric Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-01-24
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to a single frame formula low pressure frame circuit breaker, it has the current-carrying ability that improves and is suitable for to use under the environment that the electric current is 5000 ampere on an average, and it has three constitutional unit, and wherein the looks interval of two adjacent constitutional units designs to be 165 millimeters on an average, and constitutional unit includes: the contact structure comprises a movable contact component and a fixed contact component, wherein the movable contact component and the fixed contact component are mutually matched and respectively configured to have larger contact areas. This single frame formula low pressure frame circuit breaker increases the total area of moving contact and static contact through the quantity that provides the moving contact that increases and static contact, has realized the structure miniaturization when guaranteeing performance to need not to adopt the parallelly connected mode of many frame circuit breakers can provide the electric current carrying capacity of increase in order to reduce use cost, and the miniaturization has obviously reduced its space occupation size moreover, has satisfied the city planning demand of advocating and reducing electrical equipment occupation space.

Description

Single-frame low-voltage frame circuit breaker

Technical Field

The utility model relates to a power equipment technical field especially relates to a single frame formula low pressure frame circuit breaker.

Background

In the current switchgear assembly of low voltage distribution systems, the maximum current carrying of the single frame low voltage frame circuit breaker widely used on the market is 4000A. Existing single-frame low-voltage frame circuit breakers clearly fail to meet the demand when there is a demand for higher current carrying capacity. In order to solve the problem of insufficient current-carrying capacity, the existing solution is to connect low-voltage frame circuit breakers with low current-carrying capacity in parallel to form a double-frame low-voltage frame circuit breaker, so as to achieve the purpose of improving the current-carrying capacity.

On the one hand, however, the parallel connection of the low-voltage frame circuit breakers requires at least two or more related low-voltage frame circuit breakers, which increases the use cost to some extent; on the other hand, a plurality of low-voltage frame breakers connected in parallel obviously have a considerable spatial size, which is not sufficient for the urban planning requirements that call for reducing the space occupied by the electrical equipment.

Accordingly, there remains a need in the related art for improvements in low voltage frame circuit breakers that further optimize the performance of the low voltage frame circuit breaker to improve or solve the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

Therefore, the task of the present invention is to provide a single-frame low-voltage frame circuit breaker, whereby the above-mentioned drawbacks of the prior art are overcome.

In order to accomplish the above task, the present invention provides a single frame type low voltage frame circuit breaker with improved current carrying capacity, wherein the frame circuit breaker is adapted to be used in an environment where the current is substantially 5000 amperes, and has three structural units, wherein the phase distance between two adjacent structural units is designed to be substantially 165 millimeters, the structural units include: a contact structure comprising a movable contact assembly and a stationary contact assembly, wherein the movable contact assembly and the stationary contact assembly are mated with each other and are each configured to have a larger contact area.

As a preferred embodiment, the structural unit further comprises an arc chute in which a plurality of arc chute plates are arranged, wherein the arc chute plates are configured as widened arc chute plates, which arc chute plates are widened to accommodate the widened arc chute plates.

As a preferred embodiment, the arc chute plates are configured to be substantially rectangular and have a recess offset to one short side of the rectangle in a substantially V-shape at one long side of the rectangle, and a plurality of the arc chute plates are stacked in sequence in the arc extinguishing chamber in such a manner that the recesses are open to the same side but the tips of the recesses are oriented in different directions.

As a preferred embodiment, the arc chute plates are provided with at least two projections of different sizes on the opposite main planes, and the at least two projections are respectively distributed on two sides of the tip part of the notch.

As a preferred embodiment, the movable contact assembly includes: the number of the moving contacts is eighteen, and an insulating part is arranged between the adjacent moving contacts so as to electrically separate the adjacent moving contacts from each other; a power line bank including a widened base portion and a widened extension portion, and which are generally configured in a "letter of convexity" shape to form the power line bank.

As a preferred embodiment, the stationary contact assembly includes a stationary contact and a stationary terminal block electrically connected thereto, the stationary terminal block having a widened size, the stationary terminal block being provided with four silver dots arranged side by side in a width direction thereof.

As a preferred embodiment, the widened base portion is dimensioned to 138.6 ± 0.25 mm.

As a preferred embodiment, the dimension of said widened extension is configured to be 109.4 ± 0.4 mm.

As a preferred embodiment, the width of the single-frame low-voltage frame circuit breaker is constructed to be 541 ± 0.5 mm.

As a preferred embodiment, the arc extinguishing chamber is provided with an arc striking plate, and the arc striking plate extends downwards from the top of the arc extinguishing chamber to an arc striking space formed by the arc extinguishing grid plates which are overlapped with each other.

The utility model provides a single frame low pressure frame circuit breaker can use under the environment that the electric current is 5000 ampere generally, further increases the total area of moving contact and static contact through the quantity that provides the moving contact that increases and static contact simultaneously, has ensured this single frame circuit breaker's performance and has realized the structure miniaturization under the service environment of 5000 amperes generally. On one hand, the single-frame low-voltage frame circuit breaker can provide increased current carrying capacity without adopting a mode of connecting a plurality of frame circuit breakers in parallel, so that the use cost is reduced to a certain extent; on the other hand, the miniaturized single-frame low-voltage frame circuit breaker obviously reduces the space occupation size thereof, which satisfies the urban planning requirement advocating reduction of the space occupation of the electrical equipment.

Other features and advantages of the present invention will be in part apparent to those of ordinary skill in the art upon examination of the following and in part will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a front view of a single frame low voltage frame circuit breaker according to the present invention;

fig. 2 is a perspective view of the moving contact assembly of the single frame low voltage frame circuit breaker according to the present invention;

fig. 3 is a perspective view of a stationary contact assembly of a single frame low voltage frame circuit breaker according to the present invention;

fig. 4 is a perspective view of an arc chute of a single frame low voltage frame circuit breaker according to the present invention;

fig. 5 is a top view of the structure of an arc chute plate in an arc chute of the single-frame low-voltage frame circuit breaker according to the present invention;

fig. 6 is an exploded schematic view of a single frame low voltage frame circuit breaker according to the present invention.

Description of the reference numerals

1-single frame low voltage frame circuit breaker; 10-a structural unit; 12-a contact structure; 120-moving contact assembly;

120 a-moving contact; 120 b-a movable line bank; 120 c-an insulator; 120 d-base; 120 e-an extension;

122-a stationary contact assembly; 122 a-static bank; 122 b-silver dots; 14-an arc extinguishing chamber; 140-arc chute pieces;

142-a notch; 144-a bump; 146-a striking plate; 148-arc striking space; 16-operating mechanism.

Detailed Description

An exemplary scheme of a single frame type low voltage frame circuit breaker according to the present invention will now be described in detail with reference to the accompanying drawings. The drawings are provided to present embodiments of the invention, but the drawings are not necessarily to scale of the specific embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the disclosure of the present invention. The position of some components in the attached drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all of the drawings or the examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "upper", "lower", and other directional terms, will be understood to have their normal meaning and refer to those directions as they relate to when the drawings are normally viewed. Unless otherwise indicated, the directional terms described herein generally follow conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

In this document, the term "substantially" means that the referenced parameter or value need not be achieved exactly, but that deviations or variations (including, for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those skilled in the art) may occur in amounts that do not preclude the effect the described features are intended to provide.

Fig. 1 to 6 show according to the utility model provides a single frame low voltage frame circuit breaker 1, this frame circuit breaker is applicable to and uses under the environment that the electric current is 5000A on an average, compares and adopts a plurality of low voltage frame circuit breakers 1 of parallelly connecting to realize the application under this electric current environment in general among the prior art, the utility model provides a single frame low voltage frame circuit breaker 1 need not parallelly connected and has the current-carrying capacity that improves that can use under the electric current environment of about 5000A.

As shown in fig. 1, the single-frame low-voltage frame circuit breaker 1 includes three structural units 10, wherein the distance between adjacent structural units 10 is designed to be substantially 165 mm, and the width of the single-frame low-voltage frame circuit breaker is designed to be 541 ± 0.5 mm. Referring to fig. 6, each structural unit 10 includes: a contact structure 12, an arc chute 14 and an operating mechanism 16. The contact structure 12 includes a movable contact component 120 and a fixed contact component 122, the movable contact component 120 and the fixed contact component 122 are matched with each other, the movable contact component 120 includes movable contacts 120a whose number is eighteen, and the contact area between the movable contact component 120 and the fixed contact component 122 is significantly increased.

In the single frame type low voltage frame circuit breaker 1, the operating mechanism 16 controls the contact and disconnection of the moving contact assembly 120 and the fixed contact assembly 122 to be engaged with each other to achieve connection and disconnection of the circuit in the single frame type low voltage frame circuit breaker 1. During the circuit breaking stage of the single-frame low-voltage frame circuit breaker 1, the movable contact assembly 120 and the fixed contact assembly 122 generate an arc when being broken, and the arc randomly enters the arc extinguishing chamber 14 to realize arc extinguishing so as to reduce the damage to the single-frame low-voltage frame circuit breaker 1.

As shown in fig. 4, arc chute plates 140 are provided in the arc chute 14, and the arc chute plates 140 are configured as widened arc chute plates 140, and at the same time, the arc chute 14 is also widened to accommodate such widened arc chute plates 140. Referring to fig. 5, the arc chute 140 is configured in a substantially rectangular structure, and the arc chute 140 has a substantially V-shaped notch 142 offset to one short side of the rectangle at one long side of the rectangle, and the side of the V-shaped notch 142 is a substantially arc-shaped side. A plurality of arc chute plates 140 are arranged in the arc chute 14, specifically as follows: the quenching bars 140 are arranged one above the other in the quenching chamber 14 in such a way that their recesses 142 are open on the same side (on the side facing the contact arrangement 12) but the tips of the recesses 142 are oriented in different directions (on the two short sides of the rectangle). The stacked arc-extinguishing grid plates 140 form an arc-striking space 148, and after the moving contact component 120 and the static contact component 122 are disconnected, the generated arc enters the arc-striking space 148, contacts the arc-extinguishing grid plates 140 and is interrupted by the arc-extinguishing grid plates 140 to achieve an arc-extinguishing effect. However, in order to prevent the reconnection of the broken arc from affecting the arc extinguishing effect, the tip of the V-shaped notch 142 of the arc chute 140 may further introduce the broken arc into the depth of the arc chute to break it again, thereby achieving an improved arc extinguishing effect.

Referring again to fig. 4, in a preferred embodiment, in order to optimize the arc extinguishing effect of the arc extinguishing chamber 14, the arc extinguishing chamber 14 is further provided with an arc striking plate 146, and the arc striking plate 146 is arranged on the top of the arc extinguishing chamber 14 and extends from there obliquely downwards into the arc extinguishing space formed by the arc extinguishing grid plates 140 superimposed on each other. The arc generated by the breaking of the moving contact assembly 120 and the fixed contact assembly 122 is effectively guided to the relatively central position of the arc chute 140 by the arc striking plate 146, so that the arc is better guided to enter the arc chute 140 to interrupt the arc.

In addition, referring again to fig. 5, the arc chute 140 is further arranged with at least two protrusions 144 on its opposite major planes (front and back planes). In one embodiment, as shown in fig. 5, the number of the protrusions 144 is designed to be two, and the two protrusions 144 are respectively located on different sides of the tip of the recess 142 on the respective planes. The protrusion 144 may be configured in a circular, rectangular, oval, etc. shape. Those skilled in the art will appreciate that other suitable shapes may be selected to meet their function. Preferably, the two protrusions 144 are configured as differently sized structures. Due to the special arrangement of the arc chute plates 140 in the arc extinguishing chamber 14 (i.e. the adjacent arc chute plates 140 are not arranged to overlap each other completely, but are arranged to overlap each other in a front-back opposite manner), in order to avoid errors in the installation process, the protrusions 144 configured to have different sizes can effectively remind the worker of the correct installation manner of the adjacent arc chute plates 140 in the arc extinguishing chamber 14.

As shown in fig. 2, the movable contact assembly 120 includes a movable contact bar 120b electrically connected to the movable contact 120a, in addition to the movable contact 120a already mentioned above. Eighteen movable contacts 120a are arranged in parallel and an insulating member 120c is disposed between adjacent movable contacts 120a to electrically separate the adjacent movable contacts 120a from each other. The power bank 120b includes a widened base portion 120d and a widened extension portion 120e. The base portion 120d and the extension portion 120e together form a generally "male" shaped moving wire bank 120b.

As shown in fig. 3, the fixed contact assembly 122 includes a fixed contact and a fixed contact row 122a electrically connected thereto. The static wire bank 122a is configured similarly to the dynamic wire bank 120b, and is also generally in a "dogbone" configuration with a corresponding widened configuration of the base portion 120d and the extension portion 120e. The stationary terminal block 122a is provided with four silver dots 122b arranged side by side in the width direction thereof. Specifically, a plurality of silver dots 122b are arranged on one side of the base portion 120d of the static line bank 122a. The widened base portion 120d (without the silver dots 122b disposed) of the static bar 122a is configured to be 138.6 ± 0.25 mm in size, and the widened extension portion 120e (with the silver dots 122b disposed) thereof is configured to be 109.4 ± 0.4 mm in size.

In single frame low pressure frame circuit breaker 1, through the increase of the moving contact 120a of increase in quantity and static contact area of contact, the current-carrying capacity is increased effectively, compares in the low pressure frame circuit breaker 1 that the number of poles of current parallel is 6P, the utility model provides a single frame low pressure frame circuit breaker 1's number of poles falls to 3P by 6P, when improving the current-carrying capacity, this single frame low pressure frame circuit breaker 1's temperature rise and heat dissipation condition also accord with the industry standard equally and be close to the temperature rise and the heat dissipation condition that traditional number of poles is 3P's low pressure frame circuit breaker 1 on the whole.

The utility model provides a single frame low pressure frame circuit breaker can use under the environment that the electric current is 5000 ampere generally, further increases the total area of moving contact and static contact through the quantity that provides the moving contact and the static contact that increase simultaneously, has ensured this single frame circuit breaker's performance and has realized the structure miniaturization under the service environment of 5000 amperes generally. On one hand, the single-frame type low-voltage frame circuit breaker can provide increased current carrying capacity without adopting a mode of connecting a plurality of frame circuit breakers in parallel, so that the use cost is reduced to a certain extent; on the other hand, the miniaturized single-frame type low-voltage frame circuit breaker obviously reduces the space occupation size, so that the urban planning requirement for advocating reduction of the occupation space of the electrical equipment is met, and the defects in the prior art are effectively overcome.

While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified by incorporating any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.

Claims

1. A single-frame low-voltage frame circuit breaker (1) designed to have an increased current-carrying capacity, characterized in that the frame circuit breaker (1) is adapted to be used in an environment with a current of substantially 5000 amperes and has three structural units (10), wherein the phase distance between two adjacent structural units (10) is designed to be substantially 165 millimeters, the structural units (10) comprising:

a contact structure (12), the contact structure (12) comprising a movable contact assembly (120) and a stationary contact assembly (122), wherein the movable contact assembly (120) and the stationary contact assembly (122) are mated with each other and are each configured to have a larger contact area.

2. Single frame low voltage frame circuit breaker (1) according to claim 1, characterized in that the structural unit (10) further comprises an arc chute (14) having a plurality of arc chute plates (140) arranged therein, wherein the arc chute plates (140) are configured as widened arc chute plates (140), the arc chute (14) being widened to accommodate the widened arc chute plates (140).

3. Single-frame low-voltage frame circuit breaker (1) according to claim 2, characterized in that said arc chute plates (140) are configured substantially rectangular and have, on one long side of said rectangle, a notch (142) substantially V-shaped, offset towards one short side of said rectangle, a plurality of said arc chute plates (140) being stacked one after the other in said arc extinguishing chamber (14) in such a way that the notches (142) are open towards the same side but the tips of said notches (142) are oriented towards different directions.

4. Single-frame low-voltage frame circuit breaker (1) according to claim 3, characterized in that said arc chute (140) is provided with at least two projections (144) of different sizes on its opposite main planes, at least two of said projections (144) being distributed on either side of the tip of said recess (142).

5. Single-frame low-voltage frame circuit breaker (1) according to claim 1, characterized in that said moving contact assembly (120) comprises:

the number of the movable contacts (120 a) is eighteen, and an insulating piece (120 c) is arranged between the adjacent movable contacts (120 a) so as to electrically separate the adjacent movable contacts (120 a) from each other;

a movable wire bank (120 b), the movable wire bank (120 b) including a widened base portion (120 d) and a widened extension portion (120 e), and being substantially configured in a "letter of convexity" shape to form the movable wire bank (120 b).

6. Single-frame low-voltage frame circuit breaker (1) according to claim 1, characterized in that said static contact assembly (122) comprises a static contact and a static line bank (122 a) electrically connected thereto, said static line bank (122 a) having a widened dimension of said static line bank (122 a), said static line bank (122 a) being provided with four silver dots (122 b) arranged side by side along its width.

7. Single frame low voltage frame circuit breaker (1) according to claim 5, characterized in that said widened base (120 d) is dimensioned to be 138.6 ± 0.25 mm.

8. Single-frame low-voltage frame circuit breaker (1) according to claim 5, characterized in that said widened extension (120 e) is dimensioned to be 109.4 ± 0.4 mm.

9. Single frame low voltage frame circuit breaker (1) according to claim 1, characterized in that the width of the single frame low voltage frame circuit breaker (1) is configured to be 541 ± 0.5 mm.

10. Single frame low voltage frame circuit breaker (1) according to claim 2, characterized in that the arc chute (14) is provided with an arc runner (146), said arc runner (146) extending from the top of the arc chute (14) downwards to an arc striking space (148) formed by the superimposed arc chute plates (140).