Sparkproof AC motor

Abstract

The utility model discloses a spark-proof alternating current motor, which comprises a shell, a junction box fixedly arranged at the upper part of the shell, a wire holder fixedly arranged at the center of the junction box, a wiring contact fixedly arranged at the upper part of the wire holder, and an arc extinguishing shell arranged around the outer side of the wire holder, a plurality of arc extinguishing plates which are different in size and are sequentially connected in a sleeved mode are arranged in the arc extinguishing shell, when the wiring contact generates electric arcs in the on-off process of the motor and the electric arcs are diffused outwards, the generated electric arcs make contact with the arc extinguishing plates in sequence, and due to the fact that the arc extinguishing plates are made of copper-chromium alloy, the arc extinguishing effect is good. And the guide grooves formed in the arc extinguishing plates are used for weakening electric arcs with concentrated energy layer by layer, so that the electric arc energy is reduced, and the generation of the electric arcs and electric sparks is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motor production, and in particular to a spark-proof AC motor. Background Art

[0002] An electric arc is essentially a gas discharge phenomenon. When the electric field is too strong, the gas is ionized and continuously forms plasma, causing the current to pass through the insulating medium (such as air) under normal conditions, thereby generating a momentary spark, that is, an electric spark. The generation of an arc is usually accompanied by high temperature and strong light, has conductive properties, and concentrated energy.

[0003] Inside the motor's junction box, if the air between the wires and the junction box is broken due to some reason (such as insulation aging, damage, loose electrical connections, a sharp increase in voltage and current, etc.), arcs and sparks will be generated inside the junction box. This situation may cause serious damage to the motor and junction box, and even cause an electrical fire. Utility Model Content

[0004] The purpose of this utility model is to solve the problem in the prior art that if the air between the wires and the junction box is broken down due to some reasons (such as insulation aging, damage, loose electrical connection, rapid increase in voltage and current, etc.), arcs and sparks will be generated inside the junction box.

[0005] Therefore, based on the above-mentioned problem, the present invention proposes a spark-proof AC motor, comprising a shell, a junction box fixedly mounted on the upper part of the shell, a terminal block fixedly mounted at the center of the junction box, a wiring contact fixedly mounted on the upper part of the terminal block, an arc-extinguishing shell arranged around the outer side of the terminal block, and a plurality of arc-extinguishing plates of different sizes arranged inside the arc-extinguishing shell which are sequentially nested with each other.

[0006] Preferably, there are gaps between the plurality of arc-extinguishing plates, and a guide groove is provided on the side surface of each arc-extinguishing plate, and the guide groove is in a strip shape.

[0007] Preferably, the guide grooves on each arc-extinguishing plate are staggered with respect to the guide grooves of the adjacent arc-extinguishing plates.

[0008] Preferably, an outlet pipe is fixedly connected between the arc-extinguishing plate and the arc-extinguishing shell, and the outlet pipe is connected to the outside of the junction box.

[0009] Preferably, the arc-extinguishing plate is made of copper-chromium alloy, and the arc-extinguishing shell is made of heat-resistant insulating material.

[0010] Beneficial effect: When the wiring contacts generate an arc and spread outward during the switching process of the motor, the arc generated at this time will successively contact multiple arc extinguishing plates. Because the arc extinguishing plates are made of copper-chromium alloy, the guide grooves opened in the arc extinguishing plates will weaken the arc with concentrated energy layer by layer, reducing the arc energy and thus reducing the generation of arcs and sparks. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 For this utility model Figure 1 A schematic diagram of the structure at center A;

[0013] Figure 3 This is a schematic diagram of the arc extinguishing shell structure of the utility model;

[0014] Figure 4 This is a schematic cross-sectional view of the internal structure of the arc extinguishing shell of the utility model;

[0015] Figure 5 For this utility model Figure 4 A magnified schematic diagram of the structure at point B in the middle;

[0016] Figures 1 to 5 The reference numerals are: housing 1 , junction box 101 , junction seat 102 , junction contact 103 , arc extinguishing shell 2 , arc extinguishing plate 201 , guide groove 202 , outlet pipe 203 . DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figures 1 to 5 .

[0019] Working principle:

[0020] During use, when the wiring contact 103 generates an arc and spreads outward during the process of the motor being turned on and off, the arc generated at this time will first pass through the first arc extinguishing plate 201 provided in the arc extinguishing shell 2. Since the arc extinguishing plate 201 is provided with a plurality of vertical strip guide grooves 202, when the arc expands outward, it will be horizontally cut by the guide grooves 202 and absorbed by the first arc extinguishing plate 201 composed of copper-chromium alloy, and the arc that is not absorbed will move to the second arc extinguishing plate 201. Since the guide grooves 202 on each arc extinguishing plate 201 are staggered with the guide grooves 202 of the adjacent arc extinguishing plates 201, the arc extinguishing plate that absorbs laterally will contact with another arc extinguishing plate 201, resulting in part of the arc being absorbed, while the other part will directly cause the arc to turn and contact with the next arc extinguishing plate 201 for absorption, thereby weakening the arc with concentrated energy layer by layer, reducing the arc energy, and reducing the generation of arcs and sparks.

[0021] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A spark-proof AC motor, comprising a housing (1), a junction box (101) fixedly mounted on the upper portion of the housing (1), a terminal block (102) fixedly mounted at the center of the terminal block (101), and a terminal contact (103) fixedly mounted on the upper portion of the terminal block (102), characterized in that: An arc extinguishing shell (2) is provided around the outer side of the wiring seat (102), and a plurality of arc extinguishing plates (201) of different sizes that are sleeved with each other in sequence are provided inside the arc extinguishing shell (2).

2. The spark-proof AC motor according to claim 1, characterized in that: There are gaps between the plurality of arc-extinguishing plates (201), and a guide groove (202) is provided on the side surface of each arc-extinguishing plate (201), and the guide groove (202) is strip-shaped.

3. The spark-proof AC motor according to claim 2, characterized in that: The guide groove (202) on each arc-extinguishing plate (201) is staggered with respect to the guide groove (202) of the adjacent arc-extinguishing plate (201).

4. The spark-proof AC motor according to claim 3, characterized in that: An outlet pipe (203) is also fixedly connected between the arc-extinguishing plate (201) and the arc-extinguishing shell (2), and the outlet pipe (203) is connected to the outside of the junction box (101).

5. The spark-proof AC motor according to claim 3, characterized in that: The arc-extinguishing plate (201) is made of copper-chromium alloy, and the arc-extinguishing shell (2) is made of heat-resistant insulating material.

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