Surge protection device

Abstract

The utility model discloses a surge protection device, comprising a box body which is provided with a wire inlet hole; the printed circuit board is arranged in the box body; the R wiring terminal, the S wiring terminal, the T wiring terminal and the N wiring terminal are integrated on the printed circuit board; the first piezoresistor, the second piezoresistor, the third piezoresistor, the fourth piezoresistor, the fifth piezoresistor and the sixth piezoresistor are integrated on the printed circuit board. According to the utility model, six piezoresistors are adopted as main surge protection devices, a triangular and Y-shaped combined connection method is adopted to form a 380V loop and a 220V loop, and the 380V loop and the 220V loop are connected with the input end (R-S-T-N) of the elevator through an external terminal, so that when a power supply network of the elevator is impacted by surge current, no matter a differential mode or a common mode enters, the surge protection device can be used for protecting the power supply network of the elevator. The surge current can be quickly bypassed or short-circuited by means of the piezoresistor, so that the elevator equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical protection equipment, in particular to a surge protection device. Background Art

[0002] The power supply network of some electrical facilities related to people's livelihood safety, such as running elevators, may be impacted by lightning or unexplained voltage fluctuations, which will form excessive voltage and current at the input end of the elevator power supply, posing a great threat to the elevator and also dangerous to the elevator users.

[0003] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0004] The utility model aims to provide a surge protection device to suppress and protect sudden surge currents, thereby effectively protecting elevator equipment and users thereof.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A surge protection device, comprising:

[0007] A box body, wherein a wire inlet hole is formed on the box body;

[0008] a printed circuit board disposed in the box body;

[0009] An R terminal, an S terminal, a T terminal and an N terminal integrated on the printed circuit board; and

[0010] The first, second, third, fourth, fifth and sixth varistors are integrated on the printed circuit board, one end of the first varistor, one end of the second varistor and one end of the fourth varistor are respectively connected to the R terminal through the printed circuit board, the other end of the second varistor, one end of the third varistor and one end of the fifth varistor are respectively connected to the S terminal through the printed circuit board, the other end of the first varistor, the other end of the third varistor and one end of the sixth varistor are respectively connected to the T terminal through the printed circuit board, and the other end of the fourth varistor, the other end of the fifth varistor and the other end of the sixth varistor are respectively connected to the N terminal through the printed circuit board.

[0011] In a preferred embodiment of the present invention, the first, second, third, fourth, fifth and sixth varistors are metal oxide varistors.

[0012] In a preferred embodiment of the present utility model, the box body includes a bottom box and a box cover arranged on the upper end surface of the bottom box, and the wire inlet hole is opened on the side surface of the bottom box.

[0013] In a preferred embodiment of the present invention, the box cover is fixed to the upper end surface of the base box by a plurality of circumferentially spaced fastening screws.

[0014] In a preferred embodiment of the present invention, sealing strips are provided at the periphery of the upper end surface of the bottom box and the periphery of the lower end surface of the box cover.

[0015] In a preferred embodiment of the present invention, the printed circuit board is a double-sided copper-clad substrate with a thickness of 2 mm to 3 mm.

[0016] In a preferred embodiment of the present invention, the printed circuit board is fixed to the bottom surface of the bottom box by a plurality of fastening screws arranged at circumferential intervals.

[0017] In a preferred embodiment of the present utility model, a waterproof cable clip is installed at the wire inlet hole of the box body.

[0018] Due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows: the utility model adopts six varistors as the main surge protection devices, adopts a triangle and Y-type combined connection method, forms a 380V circuit and a 220V circuit, and is connected to the input end (RSTN) of the elevator through an external terminal. When the power supply network of the elevator encounters the impact of a surge current, whether it is a differential mode or a common mode, the surge current can be quickly bypassed or short-circuited with the help of a varistor, thereby protecting the elevator equipment. The utility model adopts a sealed box body, and at the same time adopts a waterproof cable clip to waterproof the incoming cable. The protection level reaches IP54D, which effectively prevents the influence of external rain and humid climate. The utility model adopts a thick substrate with double-sided copper cladding, which improves the reliability and heat dissipation performance of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0022] See also Figure 1 , the figure shows a surge protection device, including a box body 100, a printed circuit board 200, an R terminal 300a, an S terminal 300b, a T terminal 300c, an N terminal 300d and varistors 400a, 400b, 400c, 400d, 400e and 400f.

[0023] The box body 100 is a flat rectangular structure as a whole, and includes a bottom box 110 and a box cover 120. A wire entry hole 111 is provided on the side of the bottom box 110, and a waterproof cable guard 500 is installed at the wire entry hole 111 of the bottom box 110. The box cover 120 is arranged on the upper end surface of the bottom box 110, and the box cover 120 is fixed to the upper end surface of the bottom box 110 by a plurality of circumferentially spaced fastening screws (not shown in the figure). A sealing strip 130 is provided at the periphery of the upper end surface of the bottom box 120 and the periphery of the lower end surface of the box cover 120. The utility model adopts a sealed box body, and at the same time adopts a waterproof cable guard 500 to waterproof the incoming cable, and the protection level reaches IP54D, which effectively prevents the influence of external rain and humid climate.

[0024] The printed circuit board 200 is fixed to the bottom surface of the bottom box 110 of the box body 100 by a plurality of circumferentially spaced fastening screws 210. In this embodiment, the printed circuit board 200 uses a double-sided copper-clad substrate with a thickness of 2mm to 3mm, which improves the reliability and heat dissipation performance of the circuit board.

[0025] The R terminal 300a, the S terminal 300b, the T terminal 300c, and the N terminal 300d are integrated on the printed circuit board 200, and the external power cable enters the box body 100 through the wire entry hole 111 of the box body 100, and the three phase wires (R, T, S) and one neutral wire (N) of the power cable are correspondingly connected to the R terminal 300a, the S terminal 300b, the T terminal 300c, and the N terminal 300d.

[0026] The varistors 400a, 400b, 400c, 400d, 400e, and 400f are integrated on the printed circuit board 200. One end of the varistor 400a, one end of the varistor 400b, and one end of the varistor 400d are respectively connected to the R terminal 300a through the printed circuit board 200, and the other end of the varistor 400b, one end of the varistor 400c, and one end of the varistor 400e are respectively connected to the S terminal 300b through the printed circuit board 200, and the other end of the varistor 400a, the other end of the varistor 400c, and one end of the varistor 400f are respectively connected to the T terminal 300c through the printed circuit board 200, and the other end of the varistor 400d, the other end of the varistor 400e, and the other end of the varistor 400f are respectively connected to the N terminal 300d through the printed circuit board 200. In this embodiment, the varistors 400a, 400b, 400c, 400d, 400e, and 400f are preferably metal oxide varistors. The utility model uses varistors 400a, 400b, 400c, 400d, 400e, and 400f as the main surge protection devices, and adopts a triangle and Y-type combined connection method to form a 380V circuit and a 220V circuit. The maximum instantaneous (8*20 microseconds) current can reach 40000A. According to different requirements (maximum rated value of DC or AC working voltage), varistors of different specifications can be used. It is connected to the input end (RSTN) of the elevator through an external terminal. When the power supply network of the elevator encounters the impact of surge current, whether it is differential mode or common mode, the surge current can be quickly bypassed or short-circuited with the help of the varistor, thereby protecting the elevator equipment.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A surge protection device, characterized in that: include: A box body, wherein a wire inlet hole is formed on the box body; A printed circuit board disposed in the box body; An R terminal, an S terminal, a T terminal and an N terminal integrated on the printed circuit board; as well as The first, second, third, fourth, fifth and sixth varistors are integrated on the printed circuit board, one end of the first varistor, one end of the second varistor and one end of the fourth varistor are respectively connected to the R terminal through the printed circuit board, the other end of the second varistor, one end of the third varistor and one end of the fifth varistor are respectively connected to the S terminal through the printed circuit board, the other end of the first varistor, the other end of the third varistor and one end of the sixth varistor are respectively connected to the T terminal through the printed circuit board, and the other end of the fourth varistor, the other end of the fifth varistor and the other end of the sixth varistor are respectively connected to the N terminal through the printed circuit board.

2. The surge protection device according to claim 1, characterized in that: The first, second, third, fourth, fifth and sixth varistors are metal oxide varistors.

3. The surge protection device according to claim 1, characterized in that: The box body comprises a bottom box and a box cover arranged on the upper end surface of the bottom box, and the wire inlet hole is opened on the side surface of the bottom box.

4. The surge protection device according to claim 3, characterized in that: The box cover is fixed on the upper end surface of the bottom box by a plurality of fixing screws arranged at intervals in the circumferential direction.

5. The surge protection device according to claim 3, characterized in that: Sealing strips are arranged at the periphery of the upper end surface of the bottom box and the periphery of the lower end surface of the box cover.

6. The surge protection device according to claim 3, characterized in that: The printed circuit board is a double-sided copper-clad substrate with a thickness of 2 mm to 3 mm.

7. The surge protection device according to claim 6, characterized in that: The printed circuit board is fixed on the bottom surface of the bottom box by a plurality of fixing screws arranged at intervals in the circumferential direction.

8. The surge protection device according to any one of claims 1 to 7, characterized in that: A waterproof cable protection clamp is installed at the wire entry hole of the box body.

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