Over-current and over-voltage protector

Abstract

The utility model discloses an over-current and over-voltage protector, which belongs to the technical field of electronic component protection and comprises a protector shell, a bottom plate is fixed at the bottom of the protector shell through screws, threaded connection columns are fixed on the bottom plate along corners, a protective cover is fixed on the bottom plate, a cover plate fixed through screws is arranged on one side of the protective cover, and the cover plate is arranged on the other side of the protective cover. A partition plate is arranged in the protective cover and is in an angle shape, the partition plate divides the interior of the protective cover into a resin filling area and fine sand filling areas located above the resin filling area, a through groove is formed in the portion, located between the two fine sand filling areas, of the protective cover, and a buffer film plate is slidably connected into the through groove. The side face of the cover plate is provided with a through hole for a wire to pass through. The over-current and over-voltage protector is provided with a plurality of auxiliary areas, and adopts a mode of combining resin filling with fine sand filling to protect the internal piezoresistor, so that the explosion-proof and flame-retardant effects of the whole protector are effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic component protection, and particularly relates to an overcurrent and overvoltage protector. Background Art

[0002] At present, varistors are installed on various electronic components as protection devices against lightning strikes and overvoltage. The working principle is that when the voltage applied to it is lower than its threshold value "UN", the current flowing through it is extremely small, which is equivalent to a closed valve. When the voltage exceeds UN, the current flowing through it surges, which is equivalent to the valve opening, clamping the voltage to a relatively fixed voltage value, thereby protecting the subsequent circuit. Using this function, abnormal overvoltages that often occur in the circuit can be suppressed, protecting the components on the circuit from damage caused by overvoltage.

[0003] When a varistor is struck by lightning or momentary overvoltage, sparks are often generated, causing the varistor to burn or explode inside the appliance. In order to increase its safety, the varistor is often encapsulated in a fixed shell filled with insulating materials such as epoxy resin and quartz sand. This measure greatly reduces the probability of damage to the varistor, but it cannot completely prevent the occurrence of disasters, and there are still safety hazards. For the industry, it is very difficult to increase the safety rate of varistor use by a few percentage points. How to further improve the flame retardant and explosion-proof rate of varistors is an urgent problem facing technicians. Utility Model Content

[0004] The purpose of the utility model is to provide an overcurrent and overvoltage protector, which is provided with a variety of auxiliary areas, adopts resin filling combined with fine sand filling to protect the internal varistor, and effectively improves the explosion-proof and flame-retardant effect of the overall protector.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an overcurrent and overvoltage protector, comprising a protector shell, a base plate fixed with screws at the bottom of the protector shell, a threaded connecting column fixed at the upper corner of the base plate, a protective cover fixed on the base plate, a cover plate fixed with screws on one side of the protective cover, a partition plate provided inside the protective cover, the partition plate is angular, the partition plate divides the inside of the protective cover into a resin filling area and a fine sand filling area located above the resin filling area, the protective cover is provided with a through groove between the two fine sand filling areas, a buffer membrane plate is slidably connected inside the through groove, and a through hole is provided on the side of the cover plate for passing the wire.

[0006] Furthermore, the partition plate is provided with an opening toward the inner side of the protective cover.

[0007] Furthermore, connecting plates are bonded to both ends of the buffer membrane plate, and the connecting plates completely cover the opening.

[0008] Furthermore, the buffer membrane plate is configured in a corrugated shape.

[0009] Furthermore, a connecting rod is fixed to the upper end of the connecting plate, a fixed plate is fixed to the end of the connecting rod away from the connecting plate, a spring is fixed to the end of the fixed plate away from the connecting rod, a piston is fixed to the other end of the spring, a fixing rod is sleeved on the outside of the piston, the piston slides inside the fixing rod, the side of the fixing rod is fixed on the protective cover, and several connecting rods are provided on each connecting plate.

[0010] Furthermore, a clamping groove is provided at the top of the fine sand filling area, and a baffle is clamped inside the clamping groove.

[0011] The beneficial effects of the utility model are:

[0012] The overcurrent and overvoltage protector is equipped with a variety of auxiliary areas, and uses resin filling combined with fine sand filling to protect the internal varistor, effectively improving the explosion-proof and flame-retardant effect of the overall protector. 2. When the impact force is large, the buffer membrane plate can be pushed upward, and the buffer membrane plate drives the connecting plate to move, while reducing the impact force and opening the opening on the partition plate. The fine sand from the fine sand filling area automatically slides into the protective cover, further increasing the flame-retardant effect.

[0013] 3. The damping structure is composed of connecting rod, fixing plate, spring and piston to further improve the energy release effect and explosion-proof performance.

[0014] 4. The buffer membrane plate is further configured in a corrugated shape, which effectively increases the contact area with the resin filling area, further improving its buffering energy release effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the explosion structure of the overcurrent and overvoltage protector provided by the utility model;

[0016] Figure 2 It is a side schematic diagram of the protective cover and bottom plate of the overcurrent and overvoltage protector provided by the utility model;

[0017] Figure 3 The utility model provides Figure 2 Schematic diagram from another perspective;

[0018] Figure 4 The utility model provides Figure 2 Schematic diagram of the AA line section.

[0019] In the figure: 1. protector housing; 2. bottom plate; 3. threaded connecting column; 4. protective cover; 5. cover plate; 6. baffle plate; 7. partition plate; 8. resin filling area; 9. fine sand filling area; 10. through groove; 11. buffer membrane plate; 12. through hole; 13. opening; 14. connecting plate; 15. connecting rod; 16. fixing plate; 17. spring; 18. piston; 19. fixing rod; 20. snap-in groove. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0021] Please also refer to Figures 1 to 4 The over-current and over-voltage protector of the embodiment of the utility model will be described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 As shown, the overcurrent and overvoltage protector includes a protector shell 1, a bottom plate 2 is fixed with screws at the bottom of the protector shell 1, a threaded connecting column 3 is fixed at the corner of the bottom plate 2, a protective cover 4 is fixed on the bottom plate 2, a cover plate 5 fixed with screws is provided on one side of the protective cover 4, a partition plate 7 is provided inside the protective cover 4, the partition plate 7 is angular, the partition plate 7 divides the inside of the protective cover 4 into a resin filling area 8 and a fine sand filling area 9 located above the resin filling area 8, the protective cover 4 is provided with a through groove 10 between the two fine sand filling areas 9, a buffer membrane plate 11 is slidably connected inside the through groove 10, and a through hole 12 is provided on the side of the cover plate 5 for the passing of the wire.

[0023] In this embodiment, the varistor is installed inside the protective cover 4, and the wire connected to the varistor is extended through the through hole 12 on the cover plate 5 on the side of the protective cover 4. At the same time, a resin filling area 8 and a fine sand filling area 9 are set inside the protective cover 4 to jointly provide explosion-proof and flame-retardant protection for the varistor.

[0024] The resin filling area 8 is filled with resin, and the varistor is initially installed in the resin filling area 8. The resin filled in the resin filling area 8 has a good explosion-proof effect.

[0025] At the same time, the interior of the protective cover 4 is divided into two areas by a partition plate 7. When used in the initial state, the fine sand filling area 9 does not contact the varistor, and an opening 13 is provided on the partition plate 7 facing the interior of the protective cover 4. Therefore, after the opening 13 is opened, the fine sand inside the fine sand filling area 9 automatically slides along the opening 13 into the interior of the protective cover 4.

[0026] In addition, a buffer film plate 11 is arranged above the resin filling area 8. The buffer film plate 11 in this embodiment is made of high-elastic TPU material, which has good elasticity. Therefore, in the case of a varistor burst, the resin filling area 8 is subjected to impact force, which impacts the buffer film plate 11. The buffer film plate 11 can have a buffering performance to reduce the destructiveness of the impact force inside the protective cover 4. At the same time, connecting plates 14 are bonded to both ends of the buffer film plate 11, and the opening 13 is completely covered by the connecting plates 14. Further, the buffer film plate 11 is configured to be corrugated. The corrugated buffer film plate 11 effectively increases the contact area with the resin filling area 8, thereby further enhancing its buffering energy release effect.

[0027] That is, under normal working conditions, the buffer membrane plate 11 remains stable, and the connecting plates 14 at both ends thereof completely cover the opening 13 to prevent the fine sand inside the fine sand filling area 9 from sliding off.

[0028] At the same time, a connecting rod 15 is fixed to the upper end of the connecting plate 14, a fixing plate 16 is fixed to the end of the connecting rod 15 away from the connecting plate 14, a spring 17 is fixed to the end of the fixing plate 16 away from the connecting rod 15, a piston 18 is fixed to the other end of the spring 17, a fixing rod 19 is sleeved on the outside of the piston 18, the piston 18 slides inside the fixing rod 19, the side of the fixing rod 19 is fixed to the protective cover 4, and a plurality of connecting rods 15 are provided on each connecting plate 14.

[0029] Under the buffering effect of the above-mentioned buffer membrane 11 itself, a connecting rod 15 is further arranged on the connecting plate 14. When the connecting rod 15 moves up and down, it will resist the fixed plate 16. The fixed plate 16 moves upward to compress the spring 17. At the same time, the spring 17 resists the piston 18 and moves inside the fixed rod 19 until it resists the inner wall of the fixed rod 19. At this time, the connecting rod 15, the fixed plate 16, the spring 17 and the piston 18 form a damping structure, which further improves its energy release effect and further improves the explosion-proof performance.

[0030] In addition, a clamping groove 20 is provided at the top of the fine sand filling area 9 , and a baffle 6 is clamped inside the clamping groove 20 . When the baffle 6 is opened, fine sand is added into the fine sand filling area 9 .

[0031] Furthermore, in the present embodiment, resin is mainly used for explosion-proofing. When the impact force is large, the buffer membrane plate 11 can be pushed and moved upward. The buffer membrane plate 11 drives the connecting plate 14 to move, thereby reducing the impact force and opening the opening 13 on the partition plate 7. The fine sand from the fine sand filling area 9 automatically slides into the protective cover 4, further increasing the flame retardant effect.

[0032] 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. An overcurrent and overvoltage protector, characterized in that: The overcurrent and overvoltage protector comprises a protector housing (1), a bottom plate (2) being fixed by screws at the bottom of the protector housing (1), a threaded connection column (3) being fixed at the corner of the top of the bottom plate (2), a protective cover (4) being fixed on the bottom plate (2), a cover plate (5) being fixed by screws being provided on one side of the protective cover (4), a partition plate (7) being provided inside the protective cover (4), the partition plate (7) being angular, the partition plate (7) dividing the inside of the protective cover (4) into a resin filling area (8) and a fine sand filling area (9) located above the resin filling area (8), a through groove (10) being provided on the protective cover (4) between the two fine sand filling areas (9), a buffer membrane plate (11) being slidably connected inside the through groove (10), and a through hole (12) for passing a conducting wire is provided on the side of the cover plate (5).

2. The overcurrent and overvoltage protector according to claim 1, characterized in that: The partition plate (7) is provided with an opening (13) facing the inner side of the protective cover (4).

3. The overcurrent and overvoltage protector according to claim 2, characterized in that: Connecting plates (14) are bonded to both ends of the buffer membrane plate (11), and the connecting plates (14) completely cover the opening (13).

4. The overcurrent and overvoltage protector according to claim 1, characterized in that: The buffer membrane plate (11) is arranged in a corrugated shape.

5. The overcurrent and overvoltage protector according to claim 3, characterized in that: A connecting rod (15) is fixed to the upper end of the connecting plate (14); a fixing plate (16) is fixed to the end of the connecting rod (15) away from the connecting plate (14); a spring (17) is fixed to the end of the fixing plate (16) away from the connecting rod (15); a piston (18) is fixed to the other end of the spring (17); a fixing rod (19) is sleeved on the outside of the piston (18); the piston (18) slides inside the fixing rod (19); the side of the fixing rod (19) is fixed to the protective cover (4); and a plurality of connecting rods (15) are provided on each connecting plate (14).

6. The overcurrent and overvoltage protector according to claim 1, characterized in that: A clamping groove (20) is provided at the top of the fine sand filling area (9), and a baffle (6) is clamped inside the clamping groove (20).

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