Arc extinguishing chamber with arc blowing function

Abstract

The utility model relates to the technical field of circuit breakers, in particular to an arc extinguishing cover with an arc blowing function, which comprises plastic shells on two sides, the plastic shells are fixedly connected, a plurality of arc extinguishing grid sheets are arranged at the top of the plastic shells, first grooves are formed in the inner sides of the lower parts of the plastic shells, second grooves are formed in the outer sides of the lower parts of the plastic shells, and arc blowing magnetic steel is arranged in the second grooves. The arc-blowing magnetic steels on the plastic shells on the two sides are respectively N and S poles and are symmetrically arranged, protective porcelain plates are bonded in the first grooves, a contactor contact is arranged between the protective porcelain plates on the two sides, electric arcs generated in the breaking process of the contactor contact are blown to the direction of the arc-extinguishing grid sheets by magnetic field force generated by the arc-blowing magnetic steels, and the electric arcs are blocked by the arc-extinguishing grid sheets after being far away from the contactor contact. Therefore, the contactor contact is further protected, the use reliability of the arc extinguishing chamber product is improved, and the maintenance frequency of the contactor contact is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, specifically relates to an arc extinguishing cover with arc blowing function. BACKGROUND

[0002] The arc extinguishing cover is an arc extinguishing device commonly used in low-voltage electrical products such as contactors, and is an important mechanism of the contactor. The excellent function of the arc extinguishing cover directly affects the use of the contactor contacts, further affects the use reliability of the product, and the arc extinguishing cover with excellent arc extinguishing performance reduces the frequency of contactor contact maintenance and the maintenance cost in the product cycle. The design of the existing arc extinguishing cover mainly focuses on solving the complexity of installation, reducing the internal air pressure, and improving the breaking effect, but the structure is relatively complex and the effect is not good. SUMMARY

[0003] (I) Technical problem to be solved

[0004] The utility model provides an arc extinguishing cover with arc blowing function to solve the problems of the current arc extinguishing cover product use reliability, and the reduction of the contactor contact maintenance frequency.

[0005] (II) Technical scheme

[0006] In order to solve the above problems, the utility model provides an arc extinguishing cover with arc blowing function, which comprises two plastic shells on both sides, the two plastic shells are fixedly connected, a plurality of arc extinguishing fins are arranged on the top, a first groove is arranged on the inner side of the lower part of the plastic shell, a second groove is arranged on the outer side, an arc blowing magnet is arranged in the second groove, the arc blowing magnets on the two plastic shells are symmetrically arranged, the arc blowing magnets are N and S levels respectively, a protective porcelain plate is bonded in the first groove, and a contactor contact is arranged between the two protective porcelain plates.

[0007] Preferably, the protective porcelain plate is a high-aluminum porcelain material with high temperature resistance.

[0008] Preferably, the arc blowing magnet is circular in shape.

[0009] Preferably, the plastic shell is made of flame-retardant engineering material, which meets the fireproof level UL94V-0.

[0010] Preferably, the arc blowing magnet is connected with a polar plate.

[0011] (III) Technical effects

[0012] The arc extinguishing cover with arc blowing function provided by the utility model is characterized in that the electric arc generated in the contactor contact breaking process is blown to the direction of the arc extinguishing fin by the magnetic field force generated by the arc blowing magnet, the arc extinguishing fin blocks the electric arc after moving away from the contactor contact, plays an arc extinguishing role, further protects the contactor contact, improves the use reliability of the arc extinguishing cover product, and reduces the maintenance frequency of the contactor contact. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0014] Figure 1 A perspective view of the arc extinguishing cover provided in the embodiments of the present application.

[0015] Figure 2 A side view of the arc extinguishing cover provided in the embodiments of the present application.

[0016] Figure 3 A left-hand rule principle diagram of the magnetic field force direction. Figure 2 A-A sectional view in the

[0017] Figure 4 A left-hand rule principle diagram of the magnetic field force direction.

[0018] BRIEF DESCRIPTION OF DRAWINGS

[0019] 1-plastic shell, 2-arc extinguishing grid, 3-pole plate, 4-blowing arc magnetic steel, 5-protection porcelain plate, 6-contactor contact. EMBODIMENT

[0020] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should belong to the scope of protection of the present application.

[0021] EMBODIMENT

[0022] Reference is made to the drawings, a perspective view of the arc extinguishing cover provided in the embodiments of the present application, Figures 1 to 3 a side view of the arc extinguishing cover provided in the embodiments of the present application, Figure 1 A perspective view of the arc extinguishing cover provided in the embodiments of the present application, Figure 2 A side view of the arc extinguishing cover provided in the embodiments of the present application, Figure 3 A left-hand rule principle diagram of the magnetic field force direction. Figure 2The arc-extinguishing cover includes two plastic housings 1 on both sides, which are made of flame-retardant engineering plastics and meet the fireproof level UL94V-0. The two plastic housings 1 are fixedly connected, and a plurality of small holes are formed in the upper parts of the outer sides. The top of the plastic housing 1 is provided with a plurality of arc-extinguishing fins 2 fixedly connected. The lower part of the plastic housing 1 is provided with a first groove in the inner side, and the first groove is bonded with a protective porcelain plate 5. The protective porcelain plate 5 is made of high-aluminum porcelain material with high temperature resistance. The first groove is convenient for storing glue before the protective porcelain plate 5 is bonded. The bonding glue is CH-31 glue.

[0023] The middle part of the protective porcelain plate 5 on both sides is a contactor contact 6. The contactor contact 6 may splash arc during operation. The protective porcelain plate 5 prevents the arc from burning the inner wall of the plastic housing 1, thereby prolonging the service life of the plastic housing 1.

[0024] The lower part of the plastic housing 1 is provided with a second groove in the outer side, and the second groove is provided with a blow arc magnetic steel 4. The blow arc magnetic steel 4 is N and S level and is symmetrically arranged. The blow arc magnetic steel 4 is a circular magnetic steel, which is convenient for assembly.

[0025] The blow arc magnetic steel 4 is mainly fixed by CH-31 two-component glue.

[0026] Further, the blow arc magnetic steel 4 is fixedly connected with a polar plate 3. The polar plate 3 can horizontally fix the blow arc magnetic steel 4, and the magnetism of the blow arc magnetic steel 4 can be guided to the polar plate 3, thereby expanding the blow arc area.

[0027] The arc generated during the breaking process of the contactor contact 6 is blown to the direction of the arc-extinguishing fin 2 by the magnetic field force generated by the blow arc magnetic steel 4. After moving away from the contactor contact 6, the arc is blocked by the arc-extinguishing fin 2, thereby playing an arc-extinguishing role and further protecting the contactor contact 6. The use reliability of the arc-extinguishing cover product is improved, and the maintenance frequency of the contactor contact 6 is reduced.

[0028] The direction of the magnetic field force is referred to as the left-hand rule principle diagram as shown in Figure 4 According to the left-hand rule, the thumb and the other four fingers are perpendicular, and they are in the same plane. The magnetic induction line enters from the palm, and the four fingers point to the direction of the current. At this time, the direction of the thumb is the direction of the ampere force of the current-carrying conductor in the magnetic field.

[0029] It should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the application is used, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0030] It should be further noted that the terms "provided with", "provided with" and the like should be interpreted broadly unless otherwise explicitly specified and limited, and the specific meaning of the above terms in the present application can be understood according to the specific circumstances by those skilled in the art.

Claims

1. An arc extinguishing cover having an arc blowing function, characterized by comprising: The utility model provides a kind of arc extinguishing device, including two sides plastic shell, two sides the plastic shell fixed connection, top is provided with several arc extinguishing grid, the inside of the lower part of plastic shell is equipped with first recess, outside is equipped with second recess, the second recess is equipped with blow arc magnetic steel, two sides the blow arc magnetic steel of the plastic shell is symmetrically arranged, the blow arc magnetic steel is respectively N, S grade, the inside of first recess is bonded with protective porcelain plate, two sides the protective porcelain plate middle is equipped with contactor contact.

2. The arc shield with arc blowing function according to claim 1, characterized in that, The protective porcelain plate is high-alumina porcelain material with high temperature resistance.

3. The arc shield with arc blowing function according to claim 1, characterized in that, The blow arc magnetic steel is circular in shape.

4. The arc shield with arc blowing function according to claim 1, characterized in that, The plastic shell is made of flame-retardant engineering material, which meets the fire rating UL94V-0.

5. The arc extinguishing cover with arc blowing function according to any one of claims 1 to 4, characterized in that, The blow arc magnetic steel is connected with a polar plate.

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