CN114649173A - Moving contact system of circuit breaker - Google Patents

Abstract

A moving contact system of a circuit breaker is characterized in that: one end of the contact spring (1) is propped against the movable contact set (2) and is positioned at the position of one side of the movable silver point (2a) on the movable contact set (2), the contact spring (1) is positioned below the movable silver point (2a) and is opposite to the movable silver point (2a), and the contact spring (1) is positioned at the position of the other side of the movable contact rotating shaft (3). The damping of a contact spring force value can be effectively avoided, the short-time tolerance of a product is improved, particles generated when the product is disconnected are difficult to enter a contact spring, smooth closing of the product is facilitated, the installation consistency of the movable contact piece is improved, and the closing reliability of the movable contact piece is improved.

Description

Moving contact system of circuit breaker

Technical Field

The invention belongs to the technical field of low-voltage electric appliances, and particularly relates to a movable contact system of a circuit breaker.

Background

The circuit breaker is an important part of a distribution electrical appliance, is mainly used for an industrial low-voltage power system, and is used for connecting and disconnecting current in a power grid circuit and protecting lines and power supply equipment from damage caused by faults of overload, undervoltage, short circuit, single-phase grounding and the like.

Circuit breakers are classified into high-voltage circuit breakers and low-voltage circuit breakers according to their range of use. The low-voltage circuit breaker is also called an automatic switch, commonly called an air switch and also called a low-voltage circuit breaker, and is an electric appliance which not only has the function of a manual switch, but also can automatically perform voltage loss, undervoltage, overload and short-circuit protection. It can be used for distributing electric energy, starting asynchronous motor infrequently, protecting power supply circuit and motor, etc., when they are seriously overloaded or short-circuited or under-voltage, etc. faults occur, it can automatically cut off circuit, its function is equivalent to the combination of fuse type switch and over-and under-heat relay, etc., and after breaking fault current, it does not need to change parts, so that it has been extensively used.

The contact spring of the traditional circuit breaker is arranged at the rear side of the movable silver point, when a product passes through short-circuit current, because the contact spring is close to a heating point, the force value of the spring is attenuated due to heating, and the short-time tolerance of the product is influenced; particles generated during breaking of the product easily enter a contact spring, so that the spring cannot be compressed easily, and the product cannot be switched on.

The moving contact piece of traditional circuit breaker uses two splint to be fastened by self-tapping screw in the contact through the moving contact axle and supports, and moving contact axle and contact support are half-hole cooperation, and only can the unilateral be spacing, and both sides splint installation uniformity is poor, lead to the moving contact skew easily, influence the uniformity of the overrun of product, self-tapping screw connection mounting means exists has the risk of deviating from simultaneously, self-tapping screw after deviating from interferes with the casing and influences the divide-shut brake reliability of product.

Disclosure of Invention

The invention aims to overcome the defects existing in the installation position of the contact spring of the existing circuit breaker and the defects existing in the installation structure of the moving contact piece of the circuit breaker, and provides a moving contact system of the circuit breaker, which can effectively avoid the attenuation of the force value of the contact spring, improve the short-time tolerance of a product, prevent particles generated when the product is broken from entering the contact spring, facilitate the smooth switching-on of the product, improve the installation consistency of the moving contact piece and improve the switching-on reliability of the moving contact.

Technical scheme

In order to achieve the technical purpose, the invention provides a movable contact system of a circuit breaker, which is characterized in that: one end of the contact spring is propped against the movable contact set and is positioned at one side of the movable silver point on the movable contact set, the contact spring is positioned below the movable silver point and is positioned at the other side of the movable contact rotating shaft relative to the movable silver point.

Furthermore, the clamping plate is of an integrated U-shaped structure, the movable contact set is arranged on a movable contact rotating shaft, and two ends of the movable contact rotating shaft are arranged in a first limiting hole at two ends of the contact support and a second limiting hole corresponding to the first limiting hole on the arm at two sides of the clamping plate at the outer sides of the two sides of the contact support and are riveted at the second limiting hole;

two ends of the connecting shaft are arranged in the limiting holes III on two sides of the contact support and the corresponding limiting holes IV on the arms on two sides of the clamping plate on the outer sides of the two sides of the contact support and are riveted at the four positions of the limiting holes.

Furthermore, the third limiting hole is located below the second limiting hole, and the fourth limiting hole is located below the second limiting hole.

Further, the other end of the contact spring is abutted against the bottom surface of the clamping plate.

Furthermore, the contact support is provided with a spring guide groove, one end of the contact spring penetrating through the spring guide groove is abutted against the movable contact set, and the other end of the contact spring is abutted against the bottom surface of the clamping plate.

Advantageous effects

The invention provides a moving contact system of a circuit breaker, wherein a contact spring is arranged below a moving silver point and on the other side of a moving contact rotating shaft opposite to the moving silver point; when the product is cut off, the contact spring is far away from the electric arc, so that the generated particles are prevented from easily entering the contact spring; in addition, the movable contact piece group penetrates through the contact support through the movable contact rotating shaft to be riveted on the clamping plate, the contact support is a round hole, the clamping plate is integrally formed, the positioning is accurate, the deviation of the movable contact is reduced, the installation consistency of the movable contact piece is improved, the movable contact piece rotating shaft and the connecting shaft are fixed by replacing screws in a riveting fixing mode, and the screws are prevented from being separated. The whole structure improves the switching reliability of the moving contact.

Drawings

Fig. 1 is a production diagram of a movable contact system in an embodiment of the invention;

fig. 2 is an exploded view of a movable contact system in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a movable contact system in an embodiment of the invention;

FIG. 4 is a schematic diagram of a contact support in an embodiment of the invention;

FIG. 5 is a schematic structural view of a splint according to an embodiment of the present invention;

FIG. 6a is a schematic illustration of a first step in the assembly process in an embodiment of the present invention;

FIG. 6b is a schematic illustration of a second step in the assembly process in an embodiment of the present invention;

FIG. 6c is a schematic illustration of a third step in the assembly process in an embodiment of the present invention;

FIG. 6d is a schematic illustration of a fourth step in the assembly process in an embodiment of the present invention;

FIG. 6e is a schematic illustration of a fifth step in the assembly process in an embodiment of the present invention;

FIG. 6f is a schematic illustration of a sixth step in the assembly process in an embodiment of the present invention;

FIG. 6g is a schematic illustration of a seventh step in the assembly process in an embodiment of the present invention;

FIG. 6h is a schematic illustration of an eighth step in the assembly process in an embodiment of the present invention;

FIG. 6i is a schematic illustration of a ninth step in the assembly process in an embodiment of the present invention;

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present 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.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, 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.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either 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.

The invention is described in further detail below by means of specific embodiments and with reference to the attached drawings.

The movable contact system provided by the present embodiment is easy to install, as shown in fig. 1, 2 and 3, and includes a contact support 5, and clamp plates 4 are mounted on two sides of the contact support 5, in the present embodiment, as shown in fig. 5, preferably, the clamp plates 4 are an integral U-shaped structure, the movable contact set 2 is installed on the movable contact rotating shaft 3, two ends of the movable contact rotating shaft 3 are installed in a first limiting hole 501 at two ends of the contact support 5 and a second limiting hole 401 corresponding to two side arms of the clamp plate 4 on two outer sides of the contact support 5, and are riveted at the second limiting hole 401; two ends of the connecting shaft 6 are installed in the third limiting holes 502 on two sides of the contact support 5 and the corresponding fourth limiting holes 402 on the two side arms of the clamping plate 4 on the outer sides of two sides of the contact support 5 and are riveted at the fourth limiting holes 402. The third limiting hole 502 is located below the first limiting hole 501, and the fourth limiting hole 402 is located below the second limiting hole 401.

Splint 4U type splint as an organic whole, movable contact group 2 pass contact support 5 through moving contact rotation axis 3 and rivet in splint 4, and contact support 5 is the round hole, and splint 4 is integrated into one piece, and the location is accurate, reduces the moving contact incline, has improved the uniformity of movable contact installation, and movable contact rotation axis 3 and connecting axle 6 use the riveting fixed mode to replace the fix with screw, avoid the screw to deviate from. The whole structure improves the switching reliability of the moving contact.

One end of the contact spring 1 is propped against the movable contact set 2 and is positioned at the position of one side of the movable silver point 2a on the movable contact set 2, the contact spring 1 is positioned below the movable silver point 2a and is opposite to the movable silver point 2a, and the contact spring 1 is positioned at the position of the other side of the movable contact rotating shaft 3. In this embodiment, as shown in fig. 4, the contact support 5 is provided with a spring guide slot 503, and the contact spring 1 passes through the spring guide slot 503, one end of which abuts against the movable contact set 2, and the other end abuts against the bottom surface of the clamp plate 4. The contact spring 1 is arranged below the movable silver point 2a and on the other side of the movable contact piece rotating shaft 2a opposite to the movable silver point, when a product passes through short-circuit current, the contact spring 1 is far away from a heating point, the attenuation of a force value caused by high temperature is reduced, and the short-time tolerance of the product is improved; when the product is cut off, the contact spring 1 is far away from the electric arc, so that the generated particles are prevented from easily entering the contact spring 1; the insulating piece 7 is fixedly arranged on the bottom surface of the clamping plate 4 and positioned on one side of the movable silver point 2a on the movable contact group 2. The bottom of the movable contact set 2 is connected with one end of a conductive braided wire 8, and the other end of the conductive braided wire 8 is connected to a contact system bus 9. And a movable contact system rotating shaft 10 is arranged at the bottom of the clamping plate 4.

The present embodiment further provides an assembling method of the moving contact system, which includes the following steps:

as shown in fig. 6a, in the first step, one end of the conductive braided wire 8 is connected with the contact system bus 9, and the other end is connected with the movable contact set 2; in this embodiment, one end of the conductive braided wire 8 is connected with the contact system bus 9 in a welding manner, and the other end is connected with the movable contact set 2 in a welding manner.

As shown in fig. 6b, in the second step, the movable contact set 2 is assembled into the contact support 5;

as shown in fig. 6c, in the third step, the clamping plate 4 is mounted on both sides of the contact support 5, and the moving contact rotating shaft 3 sequentially passes through the corresponding holes on the clamping plate 4, the moving contact group 2 and the contact support 5 from one side;

specifically, in this embodiment, the moving contact rotating shaft 3 passes through the second limiting hole 401 on one side of the clamping plate 4, then passes through the first limiting hole 501 on the corresponding side of the contact support 5, then passes through the mounting hole on the moving contact group 2, and then sequentially passes through the first limiting hole 501 on the other side of the contact support 5 and the second limiting hole 401 on the other side of the clamping plate.

As shown in fig. 6d, in the fourth step, the clamp plate 4 rotates upward around the contact rotating shaft and the moving contact rotating shaft 3, and the contact spring 1 is inserted into the spring guiding groove 503;

as shown in fig. 6e, in the fifth step, the clamping plate 4 rotates downwards around the rotating shaft 3 of the movable contact piece to return;

as shown in fig. 6f, in the sixth step, the clamping plate 4 continues to rotate downwards around the movable contact piece rotating shaft 3 to press the contact spring 1, so that one end of the contact spring 1 is pressed against the movable contact piece group 2, and the other end is pressed against the bottom surface of the clamping plate 4; simultaneously, the connecting shaft 6 sequentially penetrates through corresponding holes on the clamping plate 4 and the contact support 5 from one side; specifically, the connecting shaft 6 passes through the fourth limiting hole 402 on one side of the clamping plate 4, then passes through the third limiting hole 502 on the corresponding side of the contact support 5, and then sequentially passes through the third limiting hole 502 on the other side of the contact support 5 and the fourth limiting hole 402 on the other side of the clamping plate.

As shown in fig. 6g, in the seventh step, the movable contact piece rotating shaft 3 and the two ends of the connecting shaft 6 are riveted at the corresponding limit holes on the arms at the two sides of the clamping plate 4.

As shown in fig. 6h, in the eighth step, the insulating member 7 is fixedly installed on the bottom surface of the clamping plate 4 at the side of the movable silver point on the movable contact group 2. In this embodiment, the insulating member 7 is fixed to the bottom surface of the clamping plate 4 by screws on the side of the movable silver point on the movable contact group 2.

As shown in fig. 6i, in the ninth step, a moving contact system rotating shaft 10 and a moving contact rotating support 11 are installed at the lower end of the clamping plate 4.

According to the assembling method of the moving contact system, the moving contact rotating shaft 3 sequentially penetrates through the corresponding holes in the clamping plate 4, the moving contact set 2 and the contact support 5 from one side without riveting, so that the clamping plate 4 can rotate around the moving contact rotating shaft, inconvenience caused by the position of the clamping plate to the installation of the contact spring during the installation of a traditional contact spring is avoided, the installation difficulty of the contact spring is greatly reduced, meanwhile, the contact spring can be further improved to be installed in place by pressing the contact spring after the clamping plate rotates and returns, finally, the consistency of the installation and opening and closing actions of the moving contact set is further improved by adopting a mode of riveting the moving contact rotating shaft, the installation difficulty is reduced, the installation time is saved, and meanwhile, the reliability of the opening and closing actions of the moving contact is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A moving contact system of a circuit breaker is characterized in that: one end of the contact spring (1) is abutted against the movable contact group (2) and is positioned at the position of one side of the movable silver point (2a) on the movable contact group (2), the contact spring (1) is positioned below the movable silver point (2a) and is opposite to the movable silver point (2a), and the contact spring (1) is positioned at the position of the other side of the movable contact rotating shaft (3).

2. The movable contact system of a circuit breaker of claim 1, wherein: the movable contact spring group (2) is arranged on a movable contact spring rotating shaft (3), and two ends of the movable contact spring rotating shaft (3) are arranged in a first limiting hole (501) at two ends of the contact support (5) and a second limiting hole (401) corresponding to the arms on two sides of the clamp plate (4) on the outer sides of two sides of the contact support (5) and are riveted at the second limiting hole (401);

two ends of the connecting shaft (6) are arranged in the limiting holes III (502) on two sides of the contact support (5) and the corresponding limiting holes IV (402) on the arms on two sides of the clamping plate (4) on the outer sides of two sides of the contact support (5) and are riveted at the limiting holes IV (402).

3. A movable contact system for a circuit breaker as claimed in claim 2, wherein: the third limiting hole (502) is located below the first limiting hole (501), and the fourth limiting hole (402) is located below the second limiting hole (401).

4. A movable contact system for a circuit breaker as claimed in claim 2, wherein: the other end of the contact spring (1) is propped against the bottom surface of the clamping plate (4).

5. A movable contact system for a circuit breaker as claimed in claim 4, wherein: the contact support (5) is provided with a spring guide groove (503), one end of the contact spring (1) penetrating through the spring guide groove (503) is abutted against the movable contact group (2), and the other end is abutted against the bottom surface of the clamping plate (4).

Images