CN113990713A

CN113990713A - Direct current breaker plastic shell mechanism

Info

Publication number: CN113990713A
Application number: CN202111176785.4A
Authority: CN
Inventors: 李涛; 黄君辉; 戴罡; 葛飞
Original assignee: Jiangsu Daquan Kaifan Switch Co ltd
Current assignee: Jiangsu Daquan Kaifan Switch Co ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2022-01-28

Abstract

The utility model provides a direct current circuit breaker moulded case mechanism, relates to the low-voltage apparatus field, and including jumping the knot, hasp and secondary hasp, it is right to jump the knot first effort is applyed to the hasp, the hasp is right secondary hasp applys the second effort, the hasp is plate type structure.

Description

Direct current breaker plastic shell mechanism

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a plastic shell mechanism of a direct-current circuit breaker.

Background

The plastic case circuit breaker is an important element in a low-voltage electrical apparatus, and the development of an industry can be restricted by the performance indexes of the plastic case circuit breaker. The tripping force of the molded case circuit breaker mechanism is an important index of a product, and the excessive tripping force can cause inaccurate characteristics, overlarge equal volume of accessories (shunt, undervoltage and magnetic flux converters), overlarge power consumption, even no action fault and the like.

Disclosure of Invention

The invention aims to provide a plastic shell mechanism of a direct current circuit breaker, which aims to solve the problems.

The embodiment of the invention is realized by the following steps:

in one aspect of the embodiments of the present invention, a molded case mechanism for a dc circuit breaker is provided, which includes a jump buckle, a lock catch and a secondary lock catch, wherein the jump buckle applies a first acting force to the lock catch, the lock catch applies a second acting force to the secondary lock catch, and the lock catch is in a plate-type structure.

Optionally, the magnitude and direction of the force exerted by the jump buckle on the lock catch is unchanged.

Optionally, the force exerted by the latch on the secondary latch is a primary resistance to clockwise rotation of the secondary latch due to friction caused by the positive pressure.

Optionally, the force exerted by the latch on the secondary latch determines the magnitude of the release force.

Optionally, the latch is a plate-type structure.

Optionally, the tripping force is controlled within 2N or within 7N.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic view of a plastic housing mechanism according to an embodiment of the invention;

fig. 2 is a schematic view of another view of the plastic housing mechanism according to the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements 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," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Fig. 1 shows a common plastic housing structure, where the parts 1 are jump buckles, 2 are lock catches, and 3 are secondary lock catches. The tripping force refers to the force exerted on the 3 at different positions that causes the mechanism to trip.

Assuming that the magnitude and direction of the force F1 exerted by the buckle 1 on the shackle 2 is constant, the moment received by the shackle 2 is F1 × L1. The force F2 ═ F1 ═ L1/L2 applied by the latch 2 to the latch 3.

The frictional force of F2, which is a positive pressure, is the main resistance to clockwise rotation of the lock catch 3, and directly determines the magnitude of the release force.

In general, reducing the coefficient of friction of the contact surfaces reduces the tripping force. But the effect is not significant. In the case where F1 and L2 could not be varied, reducing L1 is the most effective way to reduce the tripping force.

The design points of the invention are as follows: in the prior art, the lock catch 2 requires a rotation axis. Usually realized by a metal shaft, L1 is at least the radius of the rotating shaft plus the thickness of the lock catch 2 plate, and the effect is not obvious. Therefore, the lock catch 2 is designed into a flat plate by directly removing the rotating shaft. The L1 is reduced to 0 in theory, the actual product effect is obvious, the tripping force of a small product is controlled within 2N, the tripping force of a large product is controlled about 7N, and the specific structure is shown in figure 2.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a direct current circuit breaker moulded case mechanism, includes jump knot, hasp and secondary hasp, jump the knot to exert first effort the hasp, the hasp is to exert the second effort the secondary hasp, its characterized in that, the hasp is the plate type structure.

2. The dc circuit breaker mechanism as recited in claim 1, wherein the magnitude and direction of the force exerted by said jumper on said latch is constant.

3. The dc circuit breaker mechanism as recited in claim 2, wherein the friction force of the positive pressure exerted by the latch on the secondary latch is a major resistance to the secondary latch rotating in the clockwise direction.

4. The dc circuit breaker mechanism of claim 3, wherein the force exerted by the latch on the secondary latch determines the magnitude of the tripping force.

5. The dc circuit breaker mechanism of claim 1, wherein the latch is a flat plate structure.

6. The dc circuit breaker mechanism of claim 4, wherein said tripping force is controlled to within 2N or within 7N.