CN212257297U

CN212257297U - Contact device for preventing short circuit current

Info

Publication number: CN212257297U
Application number: CN202021056448.2U
Authority: CN
Inventors: 壇博治
Original assignee: Churod Electronics Co ltd
Current assignee: Churod Electronics Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-12-29
Anticipated expiration: 2030-06-10

Abstract

The utility model provides an anti short-circuit current's contact means, this anti short-circuit current's contact means includes: the device comprises a fixed frame, a first magnetizer, a movable reed, a second magnetizer, an elastic piece and a push rod. The fixed frame is provided with an accommodating channel, the movable spring plate, the second magnetizer and the elastic piece are all accommodated in the accommodating channel, the bottom of the movable spring plate is connected with the second magnetizer, and two ends of the movable spring plate are exposed out of the accommodating channel. One end of the elastic piece is connected with the bottom of the fixed frame in the accommodating channel, and the other end of the elastic piece is connected with the movable spring. The first magnetizer is connected with the fixed frame, and the first magnetizer and the second magnetizer are used for forming magnetic flux. The push rod is connected with the bottom of the fixed frame. The contact device for resisting short-circuit current realizes the resistance effect on the electric repulsion force, optimizes the short-circuit resisting effect, simplifies the structure, reduces the manufacturing cost and enhances the stability and the compactness of the structure.

Description

Contact device for preventing short circuit current

Technical Field

The utility model relates to a technical field of contactor especially relates to an anti short-circuit current's contact device.

Background

Contactors are classified into alternating current contactors (voltage AC) and direct current contactors (voltage DC), and are applied to electric power, distribution, and power utilization occasions. The contactor is an electric appliance which utilizes a coil to flow current to generate a magnetic field in industrial electricity to close a contact so as to control a load.

In circuit design, a circuit breaker and a fuse are generally connected in series in a circuit in which a contactor is located as a short-circuit protection device. When short circuit occurs, short circuit current can pass through the contact of the contactor in the time before the protection device is disconnected, and the short circuit current generates electromagnetic repulsion between the moving contact and the fixed contact. According to the magnitude of the short-circuit current, a loop electric repulsion force exceeding the pressure of the contact can be generated, so that the moving contact is repelled, the short-circuit current is broken, and the influence is generated before the contact is adhered and the periphery of the contact is damaged.

However, in order to prevent the short-circuit current from repelling the movable contact, it is ensured that the contact pressure is sufficiently high. Although this can be achieved by enlarging the electromagnetic device, the volume of the contactor is increased.

In addition, for the current common short-circuit current resisting contact device, a first magnetic body (static magnetizer) is usually fixed in a metal frame, a second magnetic body (dynamic magnetizer) integrated with the movable contact platform is arranged in the opposite direction of the first magnetic body, and the magnetic force generated by the short-circuit current is utilized to increase the electromagnetic force of the movable contact to the attraction direction of the first magnetic body, so that the contact pressure is increased, and the aim of preventing the movable contact from being repelled when the short-circuit current flows is fulfilled. However, such a short-circuit-resistant current contact device has many parts, complicated manufacturing process, and high cost.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a contact device for resisting short-circuit current, which is aimed at the technical problems of insufficient performance against electric repulsion and complicated structure.

A short-circuit current resistant contact arrangement comprising: the device comprises a fixed frame, a first magnetizer, a movable reed, a second magnetizer, an elastic piece and a push rod. The fixed frame is provided with an accommodating channel, the movable spring plate, the second magnetizer and the elastic piece are all accommodated in the accommodating channel, the bottom of the movable spring plate is connected with the second magnetizer, and two ends of the movable spring plate are exposed out of the accommodating channel. One end of the elastic piece is connected with the fixed frame at the bottom of the accommodating channel, and the other end of the elastic piece is connected with the movable spring. The first magnetizer is connected with the fixed frame, and the first magnetizer and the second magnetizer are used for forming magnetic flux. The push rod is connected with the bottom of the fixed frame.

In one embodiment, the fixing frame is provided with a receiving groove at the top of the receiving channel, and the first magnetizer is received in the receiving groove.

In one embodiment, the first magnetic conductor has a slab-like structure.

In one embodiment, the fixing frame is provided with fixing edges on two side walls of the accommodating groove, fixing edge grooves are formed on two sides of the first magnetizer, and each fixing edge is inserted into one of the fixing edge grooves and connected with the first magnetizer.

In one embodiment, the second magnetic conductor is a U-shaped structure, and two side walls of the second magnetic conductor wrap two side edges of the movable spring.

In one embodiment, two ends of the movable spring are provided with movable contacts.

In one embodiment, the second magnetizer is provided with an abdicating through groove, the bottom of the movable spring plate is provided with a limiting groove, and one end of the elastic element passes through the abdicating through groove and is inserted into the limiting groove.

In one embodiment, a fastening block is arranged at the bottom of the movable reed, a fastening hole is formed in the second magnetizer, and the fastening block is inserted into the fastening hole and connected with the second magnetizer.

In one embodiment, the fixing frame is provided with a limiting bump at the bottom of the accommodating channel, and the limiting bump is embedded in the elastic element.

In one embodiment, the bottom of the fixed frame is provided with a mounting groove, and the end part of the push rod is inserted into the mounting groove.

When the movable contact spring contacts with the static terminal of the contactor and short-circuit current flows through the contact device, electric repulsion force is generated between the movable contact spring and the static terminal. The contact device forms a magnetic path through the first magnetizer and the second magnetizer together, and the action of electric repulsion is resisted by utilizing the magnetic attraction between the first magnetizer and the second magnetizer. The contact device for resisting short-circuit current realizes the resistance effect on electric repulsion force and optimizes the effect of resisting short circuit. The fixed frame plays a role in containing and installing the first magnetizer, the movable reed, the second magnetizer and the elastic part, thereby simplifying the structure, reducing the manufacturing cost and enhancing the stability and the compactness of the structure.

Drawings

FIG. 1 is a schematic diagram of a contact arrangement for protection against short circuit currents in one embodiment;

fig. 2 is a schematic view, in exploded form, of a contact arrangement for protection against short-circuit currents according to an embodiment;

fig. 3 is a schematic view, in exploded form, of a contact arrangement for protection against short-circuit currents according to an embodiment;

FIG. 4 is a schematic cross-sectional view of a contact arrangement for protection against short-circuit currents in one embodiment;

fig. 5 is a partially sectioned schematic view of another construction of a contact arrangement resistant to short-circuit currents in an embodiment.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 5, the present invention provides a short-circuit current resistant contact device 10, wherein the short-circuit current resistant contact device 10 includes: the fixed frame 100, the first magnetizer 200, the movable reed 300, the second magnetizer 400, the elastic member 500 and the push rod 600. The fixed frame 100 is provided with an accommodating channel 110, the movable reed 300, the second magnetizer 400 and the elastic member 500 are all accommodated in the accommodating channel 110, the bottom of the movable reed 300 is connected with the second magnetizer 400, and both ends of the movable reed 300 are exposed out of the accommodating channel 110. One end of the elastic member 500 is connected to the fixed frame 100 at the bottom of the receiving channel 110, and the other end of the elastic member 500 is connected to the movable spring 300. The first magnetizer 200 is connected to the fixing frame 100, and the first magnetizer 200 and the second magnetizer 400 are used to form a magnetic flux. The push bar 600 is connected to the bottom of the fixed frame 100.

In the contact device 10 for preventing short-circuit current, when the movable contact spring 300 abuts against the fixed terminal of the contactor and short-circuit current flows, an electric repulsive force is generated between the movable contact spring 300 and the fixed terminal. The contact device 10 forms a magnetic path together with the first magnetizer 200 and the second magnetizer 400, and resists the action of electric repulsion force by using the magnetic attraction force between the first magnetizer 200 and the second magnetizer 400. The short-circuit current resisting contact device 10 achieves the effect of resisting electric repulsion force, and the effect of resisting short circuit is optimized. The fixing frame 100 has the functions of accommodating and mounting the first magnetizer 200, the movable reed 300, the second magnetizer 400 and the elastic member 500, thereby simplifying the structure, reducing the manufacturing cost and enhancing the stability and compactness of the structure.

When the coil in the contactor is energized, under the action of electromagnetic force, the push rod 600 pushes the fixed frame 100, and the fixed frame 100 drives the first magnetizer 200, the movable reed 300, the second magnetizer 400 and the elastic member 500 to move toward the static terminal of the contactor. In this embodiment, the movable contact 310 is disposed at two ends of the movable spring 300. The movable contacts 310 at the two ends of the movable spring 300 will contact with the two static terminals respectively, thereby conducting the circuit. When short-circuit current flows between the moving contact 310 and the static terminal, the contact device resisting the short-circuit current forms a magnetic path together through the first magnetizer 200 and the second magnetizer 400, and electric repulsion generated between the movable reed 300 and the static terminal is resisted by utilizing the magnetic attraction between the first magnetizer 200 and the second magnetizer 400, so that the short-circuit resisting effect is realized.

The fixing frame 100 is used for accommodating and installing the first magnetizer 200, the movable reed 300, the second magnetizer 400 and the elastic member 500, and the fixing frame 100 is in a frame-shaped structure, thereby simplifying the structure, reducing the manufacturing cost, and enhancing the structural stability and compactness. The movable reed 300, the second magnetizer 400 and the elastic member 500 are received and fixed by the receiving passage 110. In order to facilitate the installation of the first magnetic conductor 200, in one embodiment, the fixing frame 100 has a receiving slot 111 formed at the top of the receiving channel 110, and the first magnetic conductor 200 is received in the receiving slot 111. Specifically, in one embodiment, the first magnetic conductor 200 has a slab-like structure. The opening of the accommodating groove 111 provides an installation space for the first magnetizer 200, so that the compactness of the structure is improved, and the stability of the structure is guaranteed. In addition, the first magnetizer 200 and the second magnetizer 400 are facilitated to form a magnetic path, so that the resistance effect on the electric repulsive force is realized.

In order to enhance the fixing effect of the first magnetic conductor 200 and prevent the first magnetic conductor 200 from falling off from the receiving slot 111, in one embodiment, the fixing frame 100 is provided with fixing ribs 112 on two side slot walls of the receiving slot 111, two side slots 210 are provided on two sides of the first magnetic conductor 200, and each fixing rib 112 is inserted into one fixing rib slot 210 and connected to the first magnetic conductor 200. By inserting the fixing rib 112 into the fixing edge groove 210, the fixing frame 100 is firmly connected to the first magnetic conductor 200, and the first magnetic conductor 200 is not easily dropped from the receiving groove 111. Therefore, the fixing effect on the first magnetizer 200 is improved, and the structural stability of the short-circuit current resistant contact device is enhanced.

In one embodiment, the second magnetic conductor 400 is U-shaped, and two sidewalls of the second magnetic conductor 400 wrap two sides of the movable spring 300. Thus, the limiting effect on the movable reed 300 is improved, and the structure compactness is improved. In addition, the second magnetizer 400 with the U-shaped structure is beneficial to forming magnetic flux with the first magnetizer 200, and the reliability and stability of the magnetic flux path are guaranteed. In one embodiment, two sidewalls of the second magnetic conductor 400 are slidably abutted against two inner sidewalls of the fixing frame 100 in the receiving channel 110, so as to improve the working stability of the contact device against short-circuit current.

In order to enhance the connection stability of the movable reed 300 and the second magnetizer 400, in one embodiment, the bottom of the movable reed 300 is provided with a fastening block 330, the second magnetizer 400 is provided with a fastening hole 420, and the fastening block 330 is inserted into the fastening hole 420 and connected with the second magnetizer 400. The fastening block 330 is inserted into the fastening hole 420 to enhance the connection firmness of the movable reed 300 and the second magnetizer 400, so that the movable reed 300 and the second magnetizer 400 are not easy to separate. Specifically, in one embodiment, the movable reed 300 is riveted to the second magnetizer 400. Therefore, the connection stability of the movable reed 300 and the second magnetizer 400 is improved, and the structural stability of the short-circuit current resistant contact device is guaranteed.

The elastic member 500 is used to provide an elastic force to ensure the reliability of the contact between the movable spring plate 300 and the stationary terminal. In order to enhance the limiting effect on the elastic element 500, in one embodiment, the second magnetic conductor 400 is provided with a yielding through groove 410, the bottom of the movable reed 300 is provided with a limiting groove 320, and one end of the elastic element 500 passes through the yielding through groove 410 and is inserted into the limiting groove 320. In one embodiment, the elastic member 500 is a compression spring. The elastic member 500 passes through the yielding through groove 410 and is inserted into the limiting groove 320 to be connected with the movable spring plate 300, so that the abutting reliability of the movable spring plate 300 and the elastic member 500 is ensured. The spring 500 does not come off the movable spring 300. Thus, the working stability of the contact device for resisting short-circuit current is improved.

In order to further improve the installation stability of the elastic member 500, in one embodiment, the fixing frame 100 is provided with a limiting protrusion 113 at the bottom of the receiving channel 110, and the limiting protrusion 113 is embedded in the elastic member 500. The limiting protrusion 113 limits and fixes the elastic member 500, thereby ensuring stable and firm connection between the fixing frame 100 and the elastic member 500. Therefore, the working stability of the contact device for resisting short-circuit current is further improved.

In order to enhance the connection stability of the push rod 600 and the fixing frame 100, in one embodiment, the fixing frame 100 is provided with a mounting groove 120 at the bottom, and the end of the push rod 600 is inserted into the mounting groove 120. The mounting groove 120 serves to fix the push lever 600, thereby enhancing the coupling stability of the push lever 600 to the fixing frame 100. In another embodiment, the fixing frame 100 is integrally injection-molded with the push rod 600. Thus, the structural stability of the anti-short-circuit current contact device is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A short-circuit current resistant contact arrangement, comprising: the device comprises a fixed frame, a first magnetizer, a movable reed, a second magnetizer, an elastic piece and a push rod;

the fixed frame is provided with an accommodating channel, the movable spring plate, the second magnetizer and the elastic piece are accommodated in the accommodating channel, the bottom of the movable spring plate is connected with the second magnetizer, and two ends of the movable spring plate are exposed out of the accommodating channel; one end of the elastic piece is connected with the bottom of the fixed frame in the accommodating channel, and the other end of the elastic piece is connected with the movable spring leaf; the first magnetizer is connected with the fixed frame, and the first magnetizer and the second magnetizer are used for forming magnetic flux; the push rod is connected with the bottom of the fixed frame.

2. The short-circuit current resistant contact device as claimed in claim 1, wherein the fixing frame has a receiving slot at the top of the receiving channel, and the first magnetic conductor is received in the receiving slot.

3. The short-circuit current resistant contact arrangement as claimed in claim 2, characterized in that the first magnetic conductor is of a slab-like structure.

4. The short-circuit current resistant contact device as claimed in claim 3, wherein the fixing frame has fixing ribs on two side walls of the receiving slot, and fixing edge slots are formed on two sides of the first magnetic conductor, and each fixing rib is inserted into one of the fixing edge slots and connected to the first magnetic conductor.

5. The short-circuit current resistant contact device as claimed in claim 1, wherein the second magnetic conductor is U-shaped, and two side walls of the second magnetic conductor wrap two side edges of the movable spring.

6. Contact arrangement against short-circuit currents according to claim 1, characterized in that both ends of the movable spring are provided with movable contacts.

7. The short-circuit current resistant contact device as claimed in claim 1, wherein the second magnetic conductor defines a receding through groove, the movable spring plate defines a limiting groove at a bottom thereof, and one end of the elastic member passes through the receding through groove and is inserted into the limiting groove.

8. The short-circuit current resistant contact device as claimed in claim 1, wherein a fastening block is disposed at the bottom of the movable spring, the second magnetizer is provided with a fastening hole, and the fastening block is inserted into the fastening hole and connected with the second magnetizer.

9. The short-circuit current resistant contact arrangement as claimed in claim 1, wherein the fixing frame is provided with a stop lug at the bottom of the receiving channel, the stop lug being embedded in the elastic element.

10. The short-circuit current resistant contact device as claimed in claim 1, wherein the bottom of the fixed frame is provided with an installation groove, and the end of the pushing rod is inserted into the installation groove.