Plastic package piezoresistor

Abstract

The utility model relates to the technical field of plastic package piezoresistors, and provides a plastic package piezoresistor, which comprises a shell, the inner top wall and the inner bottom wall of the shell are symmetrically provided with mounting cavities, each mounting cavity is internally provided with a detachable assembly, each detachable assembly comprises a screw rod, each screw rod is rotatably connected to the inner top wall of the corresponding mounting cavity, one end of each screw rod is in transmission connection with a rotating rod, and the other end of each screw rod is in transmission connection with a screw rod. One end of the screw rod is fixedly connected with a rotating rod, the other end of the screw rod is fixedly connected with a stop block, the surface of the screw rod is in threaded connection with a moving plate, the surface of the moving plate is fixedly connected with a wedging plate, and the two sides of the shell are both in sliding connection with blocking blocks. The rotating rod drives the screw rod to rotate and enables the moving plate to move towards the outer side in the opposite direction, the wedging plate is moved out of the limiting groove, fixing of the blocking block is relieved, the whole mechanism is simple and convenient to operate, the follow-up maintenance and replacement difficulty is greatly reduced, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic-encapsulated varistors, in particular to plastic-encapsulated varistors. Background Art

[0002] The plastic-encapsulated varistor, also known as the plastic-encapsulated surface-mount varistor, is a new product in the varistor market. It is encapsulated with plastic, usually square in appearance, and has a larger volume compared to the multilayer surface-mount varistor.

[0003] For example, the Chinese Utility Model Patent No. CN207966608U discloses a plastic-encapsulated surface-mount ceramic varistor, which includes: a ceramic chip and leads; the ceramic chip includes an upper surface and a lower surface, and both the upper surface and the lower surface are flat; two electrodes are provided on the ceramic chip: a first electrode and a second electrode; the first electrode and the second electrode are respectively arranged on the upper surface and the lower surface of the ceramic chip; the leads include two leads: a first lead and a second lead, the leads are sheet-shaped, the leads include a fixed end and a welding end, the fixed end of the first lead is fixedly connected to the first electrode, the fixed end of the second lead is fixedly connected to the second electrode, and welding holes are provided on the welding ends of the first lead and the second lead. The surface-mount ceramic varistor provided by the utility model has firmly fixed leads, good product quality, good electrical conductivity, convenient placement and welding, good welding effect, is convenient for realizing serialized and miniaturized installation, and is suitable for industrialized large-scale production.

[0004] However, in the prior art, during the design and production of plastic-encapsulated varistors, due to the reasons of encapsulation materials or encapsulation processes, water vapor or other impurities are likely to penetrate into the resistor, thus affecting the performance and stability of the resistor. It is relatively inconvenient to maintain and replace the plastic-encapsulated varistor later, and further limits the practicality of the device to a certain extent. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that in the prior art, due to the reasons of encapsulation materials or encapsulation processes, water vapor or other impurities are likely to penetrate into the resistor, thus affecting the performance and stability of the resistor, and it is relatively inconvenient to maintain and replace the plastic-encapsulated varistor later.

[0006] To achieve the above object, the utility model adopts the following technical solutions: a plastic-encapsulated varistor, including a housing, the inner top wall and the inner bottom wall of the housing are symmetrically provided with installation cavities, and a detachable component is arranged inside each installation cavity. The detachable component includes a screw rod, the screw rod is rotatably connected to the inner top wall of the installation cavity, one end of the screw rod is drivingly connected to a rotating rod, the other end of the screw rod is fixedly connected to a stop block, a moving plate is threadedly connected to the surface of the screw rod, a fitting plate is fixedly connected to the surface of the moving plate, both sides of the housing are slidably connected with blocking blocks, and limiting grooves are symmetrically opened on the upper and lower surfaces of the two blocking blocks, and the limiting grooves are fitted with the fitting plate. The installation cavity and the moving plate are fixedly connected by a first return spring.

[0007] As a preferred embodiment, a resistor body is arranged in the inner cavity of the housing, and a conductive rod is fixedly connected to the center of the resistor body.

[0008] As a preferred embodiment, sleeves are fixedly connected to the inner sides of the two blocking blocks, and mounting holes are opened at the axial centers of the ends of the two blocking blocks, and the mounting holes are sleeved with the conductive rods.

[0009] As a preferred embodiment, bolts are fixedly connected to the centers of the outer sides of the two blocking blocks, and nuts are threadedly connected to the surfaces of the bolts.

[0010] As a preferred embodiment, leads are movably connected to the surfaces of the bolts, and openings are opened on the lower surfaces of the leads.

[0011] As a preferred embodiment, a plurality of second return springs arranged at equal intervals are fixedly connected to the outer side walls of the two leads below the bolts, and one ends of the plurality of second return springs are fixedly connected by an elastic sheet.

[0012] As a preferred embodiment, connecting plates are fixedly connected to both sides of the elastic sheet, and one end of the connecting plate is fixedly connected to the surface of the lead.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows:

[0014] By setting the detachable component, the utility model is convenient for later maintenance and replacement of the plastic-encapsulated varistor. During replacement, only need to reversely rotate the rotating rod, the rotating rod drives the screw rod to rotate and makes the moving plate move outward in opposite directions, so that the fitting plate is removed from the limiting groove, and the fixation of the blocking block is released. The overall mechanism is simple, the operation is convenient, the subsequent maintenance and replacement difficulty is greatly reduced, and the practicability of the device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1Schematic diagram of the three-dimensional structure of the plastic-encapsulated varistor provided by the present utility model;

[0016] Figure 2 Schematic sectional view of the three-dimensional structure of the plastic-encapsulated varistor provided by the present utility model;

[0017] Figure 3 Schematic diagram of the structure at the plugging block of the plastic-encapsulated varistor provided by the present utility model;

[0018] Figure 4 Schematic diagram of the elastic sheet structure of the plastic-encapsulated varistor provided by the present utility model.

[0019] Legend description:

[0020] 1. Outer shell; 2. Resistance body; 3. Conductive rod; 4. Installation cavity; 5. Screw; 6. Rotating rod; 7. Stopper; 8. Moving plate; 9. First return spring; 10. Fitting plate; 11. Plugging block; 12. Sleeve; 13. Installation hole; 14. Limiting groove; 15. Bolt; 16. Nut; 17. Pin; 18. Opening; 19. Second return spring; 20. Elastic sheet; 21. Connecting plate. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-4, the utility model provides a technical solution: a plastic-encapsulated varistor, which includes a housing 1. Installation cavities 4 are symmetrically formed on both the inner top wall and the inner bottom wall of the housing 1. A detachable component is arranged inside each installation cavity 4. The detachable component includes a screw rod 5. The screw rod 5 is rotatably connected to the inner top wall of the installation cavity 4. One end of the screw rod 5 is drivingly connected to a rotating rod 6. The other end of the screw rod 5 is fixedly connected to a stop block 7. A moving plate 8 is threadedly connected to the surface of the screw rod 5. A fitting plate 10 is fixedly connected to the surface of the moving plate 8. Plug blocks 11 are slidably connected to both sides of the housing 1. Limiting grooves 14 are symmetrically formed on the upper and lower surfaces of the two plug blocks 11, and the limiting grooves 14 are fitted with the fitting plate 10. The installation cavity 4 and the moving plate 8 are fixedly connected by a first return spring 9. During replacement, only need to reversely rotate the rotating rod 6. The rotating rod 6 drives the screw rod 5 to rotate and makes the moving plate 8 move outwards in opposite directions, so that the fitting plate 10 is removed from the limiting groove 14, and the fixation of the plug block 11 is released. The overall mechanism is simple, the operation is convenient, the subsequent maintenance and replacement difficulty is greatly reduced, it is convenient for subsequent maintenance and replacement of the plastic-encapsulated varistor, the structure is simple, and the operation is convenient, efficient and fast.

[0023] As Figures 1-4 shown, a resistor body 2 is arranged in the inner cavity of the housing 1. A conductive rod 3 is fixedly connected to the center of the resistor body 2. Sleeves 12 are fixedly connected to the inner sides of the two plug blocks 11. Installation holes 13 are formed at the axial centers of the ends of the two plug blocks 11, and the installation holes 13 are sleeved on the conductive rod 3. The sleeve 12 is sleeved on the resistor body 2 through the conductive rod 3 to limit the resistor body 2 and prevent it from loosening, improving the stability of the device during installation and operation.

[0024] As Figures 1-4 shown, bolts 15 are fixedly connected to the centers of the outer sides of the two plug blocks 11. Nuts 16 are threadedly connected to the surfaces of the bolts 15. Leads 17 are movably connected to the surfaces of the bolts 15. An opening 18 is formed on the lower surface of the lead 17. Due to the adoption of the bolt 15 and the nut 16, it is convenient to disassemble and assemble the lead 17. The design of the opening 18 facilitates the normal operation of the detachable component without affecting the stable placement of the plastic-encapsulated varistor, improving the stability of the device.

[0025] As Figures 1-4 shown, a plurality of equally spaced second return springs 19 are fixedly connected to the outer side walls of the two leads 17 below the bolts 15. One ends of the plurality of second return springs 19 are fixedly connected by an elastic sheet 20. Connecting plates 21 are fixedly connected to both sides of the elastic sheet 20. One end of the connecting plate 21 is fixedly connected to the surface of the lead 17. The second return spring 19 rebounds to drive the connecting plate 21 to abut against the inner cavity of the installation position through the elastic sheet 20 for limiting, so as to achieve the process of convenient disassembly and assembly, and further improve the applicability of the device.

[0026] Working principle: During use, first place the resistor body 2 in the inner cavity of the housing 1. Reverse-rotate the rotating rod 6. The rotating rod 6 drives the screw rod 5 to rotate and makes the moving plate 8 move outward in opposite directions, so that the fitting plate 10 moves out of the limiting groove 14, releasing the fixation of the blocking block 11. At this time, sleeve the blocking block 11 on both sides of the housing 1, and make the sleeve 12 sleeved on the resistor body 2 through the conductive rod 3. At this time, rotate the rotating rod 6 forward. The rotating rod 6 drives the screw rod 5 to rotate and makes the moving plate 8 move closer to the middle, so that the fitting plate 10 is inserted into the limiting groove 14 for limiting, ensuring the stability of the plastic-encapsulated varistor while sealing it. When water vapor or other impurities easily penetrate into the resistor, the structure adopted by the present invention can quickly disassemble the plastic-encapsulated varistor, and subsequent maintenance and replacement are convenient, which is suitable for large-scale promotion. At the same time, when installing the plastic-encapsulated varistor, only need to place the pin 17 in the area to be installed, and with the cooperation of the connecting plate 21, the second return spring 19 rebounds and drives the connecting plate 21 to abut against the inner cavity of the installation position through the elastic piece 20 for limiting, ensuring the stability of the installation of the plastic-encapsulated varistor.

[0027] The above are only the preferred embodiments of the present invention, and do not limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. Molded varistor, including a housing (1), characterized in that: The inner top wall and inner bottom wall of the housing (1) are symmetrically provided with installation cavities (4). A detachable component is arranged inside each installation cavity (4). The detachable component includes a screw rod (5). The screw rod (5) is rotatably connected to the inner top wall of the installation cavity (4). One end of the screw rod (5) is drivingly connected to a rotating rod (6). The other end of the screw rod (5) is fixedly connected to a stop block (7). A moving plate (8) is threadedly connected to the surface of the screw rod (5). A fitting plate (10) is fixedly connected to the surface of the moving plate (8). Plug blocks (11) are slidably connected to both sides of the housing (1). Limiting grooves (14) are symmetrically opened on the upper and lower surfaces of the two plug blocks (11), and the limiting grooves (14) are fitted with the fitting plate (10). The installation cavity (4) and the moving plate (8) are fixedly connected by a first return spring (9).

2. The plastic-encapsulated varistor according to claim 1, wherein: A resistance body (2) is arranged in the inner cavity of the housing (1). A conductive rod (3) is fixedly connected to the center of the resistance body (2).

3. The plastic-encapsulated varistor according to claim 1, wherein: Sleeves (12) are fixedly connected to the inner sides of the two plug blocks (11). Installation holes (13) are opened at the axial centers of the ends of the two plug blocks (11), and the installation holes (13) are sleeved with the conductive rod (3).

4. The plastic-encapsulated varistor according to claim 1, wherein: Bolts (15) are fixedly connected to the centers of the outer sides of the two plug blocks (11). Nuts (16) are threadedly connected to the surfaces of the bolts (15).

5. The plastic-encapsulated varistor according to claim 4, characterized in that: A lead pin (17) is movably connected to the surface of the bolt (15). An opening (18) is opened on the lower surface of the lead pin (17).

6. The plastic-encapsulated varistor according to claim 5, wherein: A number of second return springs (19) arranged at equal intervals are fixedly connected to the outer side walls of the two lead pins (17) below the bolt (15). One ends of the number of second return springs (19) are fixedly connected by an elastic sheet (20).

7. The plastic-encapsulated varistor according to claim 6, wherein: Connecting plates (21) are fixedly connected to both sides of the elastic sheet (20). One end of the side of the connecting plate (21) is fixedly connected to the surface of the lead pin (17).

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