Transformer over-current protection switch

Abstract

The utility model relates to the technical field of over-current protection switches, and discloses a transformer over-current protection switch, which comprises an over-current protection switch body, and a wiring end is arranged at the bottom of the over-current protection switch body. When a cable penetrates through the interior of the fixing frame, the cable can be conveyed upwards by one more section, the cable is supported by the fixed rod and the movable rod in a staggered mode, the cable has the tension compensation effect, when the cable is pulled or shaken by external factors, under buffering of the fixed rod, the movable rod and the reset spring, the pulling power of the cable can be reduced, and the cable is prevented from being damaged. Therefore, the stability of connection between the cable and the wiring end is improved, after the cable is conveyed upwards by more than one section, the pulled cable can be further buffered under the action of a pressing spring and a pull rod, after the cable penetrates through a fixing clamping plate to be connected with the wiring end, the cable can be extruded and fixed through an extrusion bolt, and the cable is prevented from being damaged. Therefore, the connection stability of the cable and the wiring end is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of overcurrent protection switches, in particular to an overcurrent protection switch for a transformer. Background Art

[0002] Transformer overcurrent protection switch is one of the important devices to ensure the safe operation of transformers. It limits the current passing through the transformer to prevent it from being damaged by overload, thereby ensuring the stable operation of the power system. Common overcurrent protection switches include fuses, electronic overcurrent relays, circuit breakers, overload protectors and thermal relays.

[0003] The existing overcurrent protection switch has a design defect in the terminal structure, which makes the bolt connection of the terminal easy to loosen, and finally easily causes a short circuit fault. Therefore, those skilled in the art provide a transformer overcurrent protection switch to solve the problems raised in the above background technology. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a transformer overcurrent protection switch to solve the problem that the bolted connection of the overcurrent protection switch terminal is easy to loosen, which may eventually lead to a short circuit fault.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a transformer overcurrent protection switch, comprising an overcurrent protection switch body, a wiring terminal is arranged at the bottom of the overcurrent protection switch body, a fixing clamp is arranged below the wiring terminal, an extrusion bolt is connected to the front side wall of the fixing clamp, fixing sleeves are installed on both sides of the overcurrent protection switch body, a pull rod is inserted in the fixing sleeve, a pressure spring is arranged around the pull rod, a fixing frame is installed at the bottom end of the pull rod, a fixing rod is installed laterally in the fixing frame, movable rods are arranged on the upper and lower sides of the fixing rod, a limit rod is installed on the front side of the movable rod, and a reset spring is arranged on the limit rod.

[0006] Preferably, the fixing clamp is fixedly connected to the bottom side wall of the overcurrent protection switch body, and the extrusion bolt is threadedly penetrated by the front side wall of the fixing clamp. When the cable passes through the fixing clamp and is connected to the terminal, the extrusion bolt can be used to squeeze and fix the cable, thereby increasing the connection stability between the cable and the terminal.

[0007] Preferably, a limiting ring is installed on the pull rod, one end of the pressure spring is connected to the bottom side wall of the limiting ring, and the lower end of the pressure spring is in pressure contact with the fixing sleeve. When the cable passes through the inside of the fixing frame, the cable can be transported upward a further distance. Under the action of the pressure spring and the pull rod, the pulled cable can be further buffered.

[0008] Preferably, the movable rod is located behind the fixed rod, and when the cable passes through the interior of the fixed frame, the cable is supported by the fixed rod and the movable rod in an interlaced manner, so that the cable has a tension compensation effect.

[0009] Preferably, the limit rod is slidably plugged into the front side wall of the fixing frame, a connecting plate is installed at the front end of the limit rod, one end of the return spring is connected to the connecting plate, and the other end of the return spring is connected to the front side wall of the fixing frame; under the buffering of the fixing rod, the movable rod and the return spring, the power of the cable being pulled can be reduced, thereby improving the stability of the connection between the cable and the terminal.

[0010] Compared with the prior art, the utility model provides a transformer overcurrent protection switch, which has the following beneficial effects:

[0011] Through the design, when the cable passes through the inside of the fixed frame, the cable can be conveyed upward for a longer distance. Supported by the staggered fixed rod and the movable rod, the cable has a tension compensation effect. When the cable is pulled or shaken by external factors, the fixed rod, the movable rod and the reset spring can reduce the pulling force of the cable, thereby improving the stability of the connection between the cable and the terminal. After the cable is conveyed upward for a longer distance, the pressure spring and the pull rod can further buffer the pulled cable. After the cable passes through the fixed splint and is connected to the terminal, the extrusion bolt can be used to squeeze and fix the cable, thereby increasing the connection stability between the cable and the terminal and avoiding short-circuit faults caused by loose connections at the overcurrent protection switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of a transformer overcurrent protection switch provided in an embodiment of the present application.

[0013] Figure 2 It is a structural schematic diagram of a pull rod in a transformer overcurrent protection switch provided in an embodiment of the present application.

[0014] Figure 3 It is a structural cross-sectional view of a transformer overcurrent protection switch fixing frame provided in an embodiment of the present application.

[0015] In the figure: 1. Overcurrent protection switch body; 2. Wiring terminal; 3. Fixing sleeve; 4. Pull rod; 5. Limiting ring; 6. Compression spring; 7. Fixing clamp; 8. Extrusion bolt; 9. Fixing frame; 10. Fixing rod; 11. Movable rod; 12. Limiting rod; 13. Reset spring; 14. Connecting plate. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] The utility model provides a technical solution, a transformer overcurrent protection switch, see Figure 1 , Figure 2 , including an overcurrent protection switch body 1, a terminal 2 is provided at the bottom of the overcurrent protection switch body 1, a fixing clamp 7 is provided below the terminal 2, a front side wall of the fixing clamp 7 is connected with an extrusion bolt 8, fixing sleeves 3 are installed on both sides of the overcurrent protection switch body 1, a pull rod 4 is inserted in the fixing sleeve 3, and a pressure spring 6 is provided around the pull rod 4, please refer to Figure 2 , Figure 3 A fixing frame 9 is installed at the bottom end of the pull rod 4, a fixing rod 10 is installed horizontally in the fixing frame 9, and movable rods 11 are arranged on the upper and lower sides of the fixing rod 10. A limiting rod 12 is installed on the front side of the movable rod 11, and a return spring 13 is sleeved on the limiting rod 12.

[0018] See also Figure 1 , Figure 2 The fixing clamp plate 7 is fixedly connected to the bottom side wall of the overcurrent protection switch body 1, and the extrusion bolt 8 is threadedly penetrated through the front side wall of the fixing clamp plate 7. After the cable passes through the fixing clamp plate 7 and is connected to the terminal 2, the extrusion bolt 8 can be used to squeeze and fix the cable, thereby increasing the connection stability between the cable and the terminal 2. A limit ring 5 is installed on the pull rod 4, and one end of the pressure spring 6 is connected to the bottom side wall of the limit ring 5. The lower end of the pressure spring 6 is in pressure contact with the fixing sleeve 3. When the cable passes through the inside of the fixing frame 9, the cable can be transported upward for a longer distance. Under the action of the pressure spring 6 and the pull rod 4, the pulled cable can be further buffered. Please refer to Figure 2 , Figure 3 The movable rod 11 is located behind the fixed rod 10. When the cable passes through the interior of the fixed frame 9, the cable is supported by the staggered fixed rod 10 and the movable rod 11, and has a tension compensation effect. The limit rod 12 is slidably plugged with the front side wall of the fixed frame 9. A connecting plate 14 is installed at the front end of the limit rod 12. One end of the return spring 13 is connected to the connecting plate 14, and the other end of the return spring 13 is connected to the front side wall of the fixed frame 9. Under the buffering of the fixed rod 10, the movable rod 11 and the return spring 13, the power of the cable being pulled can be reduced, thereby improving the stability of the connection between the cable and the terminal 2.

[0019] In the present invention, a terminal 2 is provided at the bottom of the overcurrent protection switch body 1, and a fixing clamp 7 is provided below the terminal 20. The fixing clamp 7 is fixedly installed with the bottom of the shell of the overcurrent protection switch body 1, and a compression bolt 8 is threadedly connected on the front side wall of the fixing clamp 7. When the cable passes through the fixing clamp 7 and is connected to the terminal 2, the compression bolt 8 can be used to squeeze and fix the cable, thereby increasing the connection stability between the cable and the terminal 2;

[0020] A fixing sleeve 3 is installed on both sides of the shell of the overcurrent protection switch body 1, and two single-side fixing sleeves 3 are arranged up and down, and a pull rod 4 is slidably sleeved in the fixing sleeve 3, and a limiting ring 5 is installed on the pull rod 4. The bottom side of the limiting ring 5 is connected with a pressure spring 6, and the bottom end of the pressure spring 6 is in pressure contact with the bottom fixing sleeve 3, and the upper side of the limiting ring 5 is in pressure contact with the upper fixing sleeve 3. A fixing frame 9 is installed at the bottom of the pull rod 4, and a fixing rod 10 is transversely installed in the fixing frame 9. A movable rod 11 is arranged on the upper and lower sides of the fixing rod 10, and the movable rod 11 is located at the rear side relative to the fixed rod 10. A limiting rod 12 is installed on the front side of the movable rod 11, and the limiting rod 12 passes through the front side wall of the fixing frame 9, and a connecting plate 14 is installed at one end of the limiting rod 12 protruding from the fixing frame 9, and a reset spring 13 is installed on one side of the connecting plate 14, and the reset spring 13 is sleeved with the limiting rod 12, and the other end of the reset spring 13 is fixedly connected to the front side wall of the fixing frame 9;

[0021] When the cable passes through the interior of the fixed frame 9, the cable can be conveyed upward for a longer distance. Supported by the staggered fixed rod 10 and the movable rod 11, the cable has a tension compensation effect. When the cable is pulled or shaken by external factors, the fixed rod 10, the movable rod 11 and the return spring 13 can reduce the pulling force of the cable, thereby improving the stability of the connection between the cable and the terminal 2. After the cable is conveyed upward for a longer distance, the pressure spring 6 and the pull rod 4 can further buffer the pulled cable.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer overcurrent protection switch, comprising an overcurrent protection switch body (1), characterized in that: A terminal (2) is provided at the bottom of the overcurrent protection switch body (1), a fixing clamp (7) is provided below the terminal (2), a front side wall of the fixing clamp (7) is connected to an extrusion bolt (8), fixing sleeves (3) are installed on both sides of the overcurrent protection switch body (1), a pull rod (4) is inserted into the fixing sleeve (3), a compression spring (6) is sleeved around the side of the pull rod (4), a fixing frame (9) is installed at the bottom end of the pull rod (4), a fixing rod (10) is transversely installed in the fixing frame (9), movable rods (11) are provided on the upper and lower sides of the fixing rod (10), a limit rod (12) is installed on the front side of the movable rod (11), and a return spring (13) is sleeved on the limit rod (12).

2. A transformer overcurrent protection switch according to claim 1, characterized in that: The fixing clamping plate (7) is fixedly connected to the bottom side wall of the overcurrent protection switch body (1), and the extrusion bolt (8) is threadedly penetrated by the front side wall of the fixing clamping plate (7).

3. A transformer overcurrent protection switch according to claim 1, characterized in that: A limit ring (5) is installed on the pull rod (4), one end of the pressure spring (6) is connected to the bottom side wall of the limit ring (5), and the lower end of the pressure spring (6) is in pressure contact with the fixing sleeve (3).

4. A transformer overcurrent protection switch according to claim 1, characterized in that: The limiting rod (12) is slidably plugged into the front side wall of the fixing frame (9); a connecting plate (14) is installed at the front end of the limiting rod (12); one end of the return spring (13) is connected to the connecting plate (14); and the other end of the return spring (13) is connected to the front side wall of the fixing frame (9).

5. The transformer overcurrent protection switch according to claim 1, characterized in that: The movable rod (11) is located behind the fixed rod (10).

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