A pneumatic knife switch structure

Abstract

The utility model discloses a pneumatic knife switch structure, which includes an insulating base: the upper surface of the insulating base is fixedly connected to a first contact knife seat, the upper surface of the insulating base is fixedly connected to a second contact knife seat away from the first contact knife seat, the upper surfaces of the first contact knife seat and the second contact knife seat are provided with slots, the upper surface of the insulating base is fixedly connected to a support plate, the support plate is L-shaped, the lower surface of the horizontal part of the support plate is fixedly connected to a cylinder, the output end of the cylinder is fixedly connected to a piston rod, the lower surface of the piston rod is fixedly connected to a moving plate, the lower surface of the moving plate is fixedly connected to a knife, the upper surface of the moving plate is provided with a through circular hole, the upper surface of the insulating base is fixedly connected to a limit shaft, and the limit shaft passes through the through circular hole of the moving plate. By arranging the first contact knife seat, the second contact knife seat, the support plate, the cylinder, the piston rod, the moving plate, and the knife, it can be effectively used under high voltage and high current conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical power distribution, in particular to a pneumatic knife switch structure. Background Art

[0002] A knife switch is a leakage protection switch, which is mainly used to isolate power supply, switch operation, connect and cut off low current circuits. It is equipped with a fuse inside and is often used to protect various household appliances to avoid excessive power load of household appliances. It is generally used for AC and DC low voltage (not more than 500V) circuits that do not need to be frequently cut off and closed. Its working current cannot exceed the rated value under the rated voltage. On machine tools, knife switches are mainly used as power switches. They are generally not used to connect or cut off the working current of motors. Knife switches are divided into single-pole, double-pole and three-pole. The commonly used three-pole knife switches have five types of long-term allowable currents of 100A, 200A, 400A, 600A and 1000A. The product models produced include HD (single throw) and HS (double throw) series.

[0003] Ordinary knife switches can only be used in low voltage and low current situations, but cannot be used in high voltage and high current situations, so they are not very applicable. Utility Model Content

[0004] The utility model provides a pneumatic knife switch structure which can be effectively used under high voltage and high current conditions.

[0005] To achieve the above-mentioned purpose, a pneumatic knife switch structure is provided, including an insulating base: the upper surface of the insulating base is fixedly connected to a first contact knife seat, the upper surface of the insulating base is fixedly connected to a second contact knife seat away from the first contact knife seat, the upper surfaces of the first contact knife seat and the second contact knife seat are provided with slots, the upper surface of the insulating base is fixedly connected to a support plate, the support plate is L-shaped, the lower surface of the horizontal part of the support plate is fixedly connected to a cylinder, the output end of the cylinder is fixedly connected to a piston rod, the lower surface of the piston rod is fixedly connected to a moving plate, the lower surface of the moving plate is fixedly connected to a contact, the upper surface of the moving plate is provided with a through circular hole, the upper surface of the insulating base is fixedly connected to a limit shaft, and the limit shaft passes through the through circular hole of the moving plate. The first contact knife holder and the second contact knife holder are provided to facilitate the cooperation with the contact knife, the cylinder and the piston rod are provided to facilitate the moving plate to move up and down, the moving plate is provided to facilitate the movement of the contact knife during its movement, so that the contact knife controls the on and off of the first contact knife holder and the second contact knife holder, and the limit axis is provided to facilitate the determination of the moving trajectory of the moving plate.

[0006] According to the pneumatic knife switch structure, the upper surface of the insulating base is fixedly connected to a fixing mechanism, the fixing mechanism is on the left side of the first contact knife seat, the fixing mechanism includes a lower shell, an upper shell, a vertical plate, a fixing shaft and a side plate, and the lower shell is fixedly connected to the upper surface of the insulating base. The fixing mechanism is provided to facilitate the rapid fixing of the position of the fuse, so that the fuse can be quickly replaced after it burns out.

[0007] According to the pneumatic knife switch structure, the vertical plate is fixedly connected to the side surface of the lower shell, and the fixed shaft is fixedly connected to the side surface of the vertical plate.

[0008] According to the pneumatic knife switch structure, the side plate is fixedly connected to the side surface of the upper shell, the side plate is rotatably connected to the cylindrical surface of the fixed shaft, the upper shell and the lower shell are respectively provided with semicircular holes at the overlapped part, and the upper shell and the lower shell are provided with a fuse at the overlapped part. The purpose of providing the fuse is to facilitate the fusing when the circuit is overloaded, thereby protecting the circuit and avoiding fire caused by excessive current.

[0009] According to the pneumatic knife switch structure, the left surface of the first contact holder is fixedly connected to the first contact head, and the first contact head is in contact with the right end surface of the fuse.

[0010] According to the pneumatic knife switch structure, the upper surface of the insulating base is fixedly connected to a connector seat, and the connector seat is on the left side of the fixing mechanism.

[0011] According to the pneumatic knife switch structure, the right side surface of the connector seat is fixedly connected to the second contact head, and the second contact head is in contact with the left side end surface of the fuse.

[0012] According to the pneumatic knife switch structure, the left surface of the connector seat is fixedly connected to the outgoing connector, and the right surface of the second contact knife seat is fixedly connected to the incoming connector. The outgoing connector and the incoming connector are provided to facilitate the connection of external wires.

[0013] The beneficial effects of the utility model are as follows: by arranging the first contact knife seat, the second contact knife seat, the support plate, the cylinder, the piston rod, the moving plate and the contact knife, the utility model can be effectively used under the condition of high voltage and high current.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1This is a schematic diagram of the overall structure of a pneumatic knife switch structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the fixing mechanism structure of a pneumatic knife switch structure of the utility model;

[0018] Figure 3 This is an enlarged view of the local structure at A of a pneumatic knife switch structure of the utility model;

[0019] Figure 4 This is an enlarged view of the local structure at position B of a pneumatic knife switch structure of the utility model.

[0020] Legend:

[0021] 1. Insulating base; 2. Fuse; 3. Fixing mechanism; 301. Lower shell; 302. Upper shell; 303. Vertical plate; 304. Fixed shaft; 305. Side plate; 4. First contact knife holder; 5. Second contact knife holder; 6. Limiting shaft; 7. Incoming connector; 8. Contact knife; 9. Moving plate; 10. Piston rod; 11. Cylinder; 12. Support plate; 13. First contact head; 14. Connector seat; 15. Second contact head; 16. Outgoing connector. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figures 1 to 4 The utility model embodiment is a pneumatic knife switch structure, which includes an insulating base 1: the upper surface of the insulating base 1 is fixedly connected to the first contact knife seat 4, the upper surface of the insulating base 1 is fixedly connected to the second contact knife seat 5 away from the first contact knife seat 4, the upper surfaces of the first contact knife seat 4 and the second contact knife seat 5 are provided with slots, the upper surface of the insulating base 1 is fixedly connected to the support plate 12, the support plate 12 is L-shaped, the lower surface of the horizontal part of the support plate 12 is fixedly connected to the cylinder 11, the output end of the cylinder 11 is fixedly connected to the piston rod 10, the lower surface of the piston rod 10 is fixedly connected to the moving plate 9, the lower surface of the moving plate 9 is fixedly connected to the contact knife 8, the upper surface of the moving plate 9 is provided with a through circular hole, the upper surface of the insulating base 1 is fixedly connected to the limit shaft 6, the limit shaft 6 passes through the through circular hole of the moving plate 9, the first contact knife seat 4, the second contact knife seat 5, and the contact knife 8 are two in number and are symmetrically distributed with each other, the moving plate 9 and the piston rod 10 are made of insulating material, and the contact knife 8 can be inserted into the slots of the first contact knife seat 4 and the second contact knife seat 5 to form a passage.

[0024] The left surface of the first contact holder 4 is fixedly connected to the first contact 13 , which contacts the right end surface of the fuse 2 . The upper surface of the insulating base 1 is fixedly connected to the connector seat 14 , which is on the left side of the fixing mechanism 3 .

[0025] The right side surface of the connector base 14 is fixedly connected to the second contact head 15, which contacts the left end surface of the fuse 2. The left side surface of the connector base 14 is fixedly connected to the outlet connector 16, and the right side surface of the second contact knife base 5 is fixedly connected to the incoming connector 7.

[0026] The upper surface of the insulating base 1 is fixedly connected to a fixing mechanism 3, which is on the left side of the first contact holder 4. The fixing mechanism 3 includes a lower shell 301, an upper shell 302, a vertical plate 303, a fixed shaft 304 and a side plate 305. The lower shell 301 is fixedly connected to the upper surface of the insulating base 1. There are four fixing mechanisms 3, and two of them correspond to the positions of the first contact holder 4 and the second contact holder 5. The lower shell 301 and the upper shell 302 are made of insulating material. Magnets with opposite magnetic poles are respectively arranged at the overlapping parts of the lower shell 301 and the upper shell 302. After they overlap, the lower shell 301 and the upper shell 302 are adsorbed together. The diameter of the circular hole formed by the lower shell 301 and the upper shell 302 is the same as the diameter at both ends of the fuse 2.

[0027] The vertical plate 303 is fixedly connected to the side surface of the lower shell 301, the fixed shaft 304 is fixedly connected to the side surface of the vertical plate 303, the side plate 305 is fixedly connected to the side surface of the upper shell 302, the side plate 305 is rotatably connected to the cylindrical surface of the fixed shaft 304, the upper shell 302 and the lower shell 301 are respectively provided with semicircular holes at the overlapping positions, and the fuse 2 is provided at the overlapping positions of the upper shell 302 and the lower shell 301.

[0028] Working principle: The cylinder 11 drives the piston rod 10 to control the moving plate 9 and the contact knife 8 to move up and down, and completes the insertion and removal of the contact knife 8 in the slots of the first contact knife seat 4 and the second contact knife seat 5, thereby controlling the opening and closing of the knife switch. The piston rod 10 is made of insulating material, which ensures that the knife switch can be used under high current conditions. At the same time, it can react to the state of the switch in the circuit according to the state of the cylinder 11.

[0029] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A pneumatic knife switch structure, characterized in that: The invention comprises an insulating base (1): the upper surface of the insulating base (1) is fixedly connected to a first contact knife seat (4); the upper surface of the insulating base (1) is fixedly connected to a second contact knife seat (5) away from the first contact knife seat (4); the upper surfaces of the first contact knife seat (4) and the second contact knife seat (5) are provided with slots; the upper surface of the insulating base (1) is fixedly connected to a support plate (12); the support plate (12) is L-shaped; the lower surface of the horizontal part of the support plate (12) is fixedly connected to a cylinder (11); the output end of the cylinder (11) is fixedly connected to a piston rod (10); the lower surface of the piston rod (10) is fixedly connected to a movable plate (9); the lower surface of the movable plate (9) is fixedly connected to a contact knife (8); the upper surface of the movable plate (9) is provided with a through circular hole; the upper surface of the insulating base (1) is fixedly connected to a limit shaft (6); the limit shaft (6) passes through the through circular hole of the movable plate (9).

2. A pneumatic knife switch structure according to claim 1, characterized in that: The upper surface of the insulating base (1) is fixedly connected to a fixing mechanism (3), the fixing mechanism (3) is on the left side of the first contact blade seat (4), the fixing mechanism (3) comprises a lower shell (301), an upper shell (302), a vertical plate (303), a fixing shaft (304) and a side plate (305), and the lower shell (301) is fixedly connected to the upper surface of the insulating base (1).

3. A pneumatic knife switch structure according to claim 2, characterized in that: The vertical plate (303) is fixedly connected to the side surface of the lower shell (301), and the fixed shaft (304) is fixedly connected to the side surface of the vertical plate (303).

4. A pneumatic knife switch structure according to claim 2, characterized in that: The side plate (305) is fixedly connected to the side surface of the upper shell (302), and the side plate (305) is rotatably connected to the cylindrical surface of the fixed shaft (304). Semicircular holes are respectively arranged at the overlapping parts of the upper shell (302) and the lower shell (301), and a fuse (2) is arranged at the overlapping part of the upper shell (302) and the lower shell (301).

5. The pneumatic knife switch structure according to claim 1, characterized in that: The left side surface of the first contact holder (4) is fixedly connected to the first contact head (13), and the first contact head (13) is in contact with the right side end surface of the fuse (2).

6. A pneumatic knife switch structure according to claim 1, characterized in that: The upper surface of the insulating base (1) is fixedly connected to a joint seat (14), and the joint seat (14) is located on the left side of the fixing mechanism (3).

7. A pneumatic knife switch structure according to claim 6, characterized in that: The right side surface of the connector seat (14) is fixedly connected to a second contact head (15), and the second contact head (15) is in contact with the left side end surface of the fuse (2).

8. The pneumatic knife switch structure according to claim 6, characterized in that: The left surface of the connector seat (14) is fixedly connected to the outgoing line connector (16), and the right surface of the second contact knife seat (5) is fixedly connected to the incoming line connector (7).

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