Direct-current double-channel arc extinguishing structure of circuit breaker

Abstract

A direct-current double-channel arc extinguishing structure of a circuit breaker comprises an arc extinguishing chamber and is characterized in that a magnetic conductive block is arranged at an arc inlet of the arc extinguishing chamber, and the magnetic conductive block and first magnetic steel and second magnetic steel arranged on the two sides of the arc inlet of the arc extinguishing chamber respectively form a corresponding first arc running channel and a corresponding second arc running channel. And the magnetic field force in the first arc running channel or the second arc running channel can correspondingly enable the corresponding forward electric arc or reverse electric arc generated by the circuit breaker to be subjected to magnetic blow-out force towards the direction of the arc extinguish chamber. According to the arc extinguishing structure, the arc running channel is divided into two strong magnetic channels with opposite magnetic forces by arranging the magnetic conductive block on the arc striking angle. The non-polarity requirement of the high-voltage direct-current circuit breaker in use can be met, and the electrical life, breaking performance, criticality and other performance of the non-polarity high-voltage direct-current circuit breaker can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a DC dual-channel arc extinguishing structure of a circuit breaker. Background Art

[0002] Circuit breakers are an important part of power distribution equipment. They are mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The function of circuit breakers to disconnect overload or short-circuit currents is mainly completed by the arc extinguishing chamber installed in the circuit breaker. When a fault current appears in the circuit and the current value exceeds the set protection range of the intelligent controller, the operating mechanism is driven to act, so that the moving and static contacts of the circuit breaker are quickly disconnected. At this time, the voltage between the moving and static contacts causes the air medium to discharge and generate a high-temperature arc. The arc causes the air temperature in the arc extinguishing device to rise sharply during the burning process, thereby accelerating the ionization of the air. On the other hand, the arc is driven by the magnetic field and fluid effect in the arc extinguishing chamber, and is divided into multiple short arcs by multiple arc-isolating grids. The arc deionization effect is enhanced by the metal arc-isolating grids, and the arc becomes smaller and the voltage rises rapidly, so that the arc is extinguished.

[0003] The arc generated by the contacts of traditional DC circuit breakers when disconnecting or merging is not easy to extinguish quickly, which seriously delays the circuit breaking capacity of the circuit breaker. The commonly used arc extinguishing method is to introduce the generated arc into the arc extinguishing chamber through the arc-starting plate for arc extinguishing. Chinese Patent 201420428053.9 discloses a small circuit breaker with a magnetic conductive plate. It solves the problem that the arc-starting effect of the existing small circuit breaker is poor, which makes the arc extinguishing time of the small circuit breaker long. It includes a shell, a contact system and an arc extinguishing system are arranged in the shell, a magnetic conductive plate is arranged in the shell, and the magnetic conductive plate includes a first magnetic conductive plate and a second magnetic conductive plate, the first magnetic conductive plate is provided with a bending portion, and the second magnetic conductive plate cover is placed on the bending portion of the first magnetic conductive plate to form an electromagnetic channel, and the two ends of the electromagnetic channel are respectively connected to the arc extinguishing system and the contact system. The miniature circuit breaker has an additional magnetic conductive plate, so that when the miniature circuit breaker interrupts the short-circuit current, the arc quickly enters the arc extinguishing chamber of the arc extinguishing system under the effects of magnetic blowing effect and gas dynamics, thereby improving the heat dissipation and magnetic blowing capabilities of the arc; at the same time, the arc extinguishing capability of the circuit breaker for interrupting the short-circuit current is improved, thereby improving the short-circuit current breaking capability.

[0004] However, when such existing DC circuit breakers (MCBs) are used in high voltage DC environments, arcing time is still too long and the product is burned out. At the same time, when conventional DC circuit breakers (MCBs) use magnetic blowing to extinguish arcs, the magnetic field arrangement cannot meet the requirement of non-polarity. Summary of the invention

[0005] The purpose of the present invention is to provide a DC dual-channel arc extinguishing structure for the circuit breaker in view of the defects existing in the use of the above-mentioned existing DC circuit breakers. By arranging a magnetic conductive block on the arc striking angle, the arc path is divided into two strong magnetic channels with opposite magnetic forces. When the positive current passes through, the arc goes through one channel, and when the reverse current passes through, the arc goes through the other channel. The dual channels can make the arcs in both positive and negative directions receive the magnetic blowing force in the direction of the arc extinguishing chamber, which can not only meet the non-polarity requirements of the high-voltage DC circuit breaker when in use, but also effectively improve the electrical life, breaking and critical performance of the non-polarity high-voltage DC circuit breaker.

[0006] Technical Solution

[0007] In order to achieve the above technical objectives, the present invention provides a DC dual-channel arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber, and is characterized in that: a magnetic block is arranged at the arc entrance of the arc extinguishing chamber, and the magnetic block and the first magnetic steel and the second magnetic steel arranged on both sides of the arc entrance of the arc extinguishing chamber respectively form a corresponding first arc track and a second arc track, and the magnetic field force in the first arc track or the second arc track can correspondingly cause the corresponding forward arc or reverse arc generated by the circuit breaker to be subjected to a magnetic blowing force toward the arc extinguishing chamber.

[0008] In one embodiment, the magnetic conductive block is located between the first magnetic steel and the second magnetic steel.

[0009] In one embodiment, the polarities of the opposite sides of the first magnetic steel and the second magnetic steel are the same.

[0010] In one embodiment, the magnetic pole of one side end of the magnetic conductive block located between the first magnetic steel and the second magnetic steel corresponds to the polarity of a side surface opposite to the first magnetic steel and the second magnetic steel.

[0011] In one embodiment, the magnetic conductive block is arranged on the arc striking angle at the arc entrance of the arc extinguishing chamber.

[0012] In one of the embodiments, the magnetic conductive block is arranged in the inner cavity of the partition cover on the arc striking angle at the arc entrance of the arc extinguishing chamber.

[0013] In one of the embodiments, the magnetic conductive block is installed into the inner cavity of the partition cover through an opening on the partition cover.

[0014] In one of the embodiments, the partition cover is inserted into the mounting hole on the arc starting angle.

[0015] In one of the embodiments, a limiting feature part 1 is provided on one side of the bottom of the partition cover, a limiting feature part 1 corresponding to the limiting feature part 1 is provided on one side of the mounting hole, a limiting feature part 2 is provided on one side of the top of the partition cover, and a limiting feature part 2 corresponding to the limiting feature part 2 is provided on the other side of the mounting hole.

[0016] In one of the embodiments, the magnetic conductive block is installed in the inner cavity of the partition cover on the arc striking angle at the arc entrance of the arc extinguishing chamber through transition fit.

[0017] In one embodiment, the first magnetic steel and the second magnetic steel are respectively mounted on the outer surfaces of the first gas producing member and the second gas producing member on both sides of the arc entrance of the arc extinguishing chamber.

[0018] In one embodiment, the engaging and separating position of the moving contact and the stationary contact is at the arc entrance of the arc extinguishing chamber, and the arc striking angle is arranged at the arc entrance of the arc extinguishing chamber below the engaging and separating position of the moving contact and the stationary contact.

[0019] Beneficial Effects

[0020] The present invention provides a DC dual-channel arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber, a magnetic conductive block is arranged at the arc entrance of the arc extinguishing chamber, and the magnetic conductive block and the first magnetic steel and the second magnetic steel arranged on both sides of the arc entrance of the arc extinguishing chamber respectively form a corresponding first arc runway and a second arc runway, and the magnetic field force in the first arc runway or the second arc runway can correspondingly make the corresponding forward arc or reverse arc generated by the circuit breaker receive a magnetic blowing force toward the arc extinguishing chamber. This arc extinguishing structure divides the arc runway into two strong magnetic channels with opposite magnetic forces by arranging a magnetic conductive block on the arc striking angle. When the forward current passes through, the arc goes through one of the channels, and when the reverse current passes through, the arc goes through the other channel. The dual channels can make the arcs in both the forward and reverse directions receive a magnetic blowing force toward the arc extinguishing chamber, which can not only meet the non-polarity requirements when the high-voltage DC circuit breaker is used, but also effectively improve the electrical life, breaking and critical performance of the non-polarity high-voltage DC circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Attached Figure 1 This is a product schematic diagram of the circuit breaker arc extinguishing system of the present invention. Figure 1 ;

[0023] Attached Figure 2 This is a product schematic diagram of the circuit breaker arc extinguishing system of the present invention. Figure 2 ;

[0024] Attached Figure 3 It is a schematic diagram of the DC dual-channel arc extinguishing structure of the circuit breaker in the present invention;

[0025] Attached Figure 4 It is a product schematic diagram of the arc striking angle in the present invention;

[0026] Attached Figure 5 It is a product schematic diagram of the partition cover in the present invention;

[0027] Attached Figure 6a It is a product schematic diagram of the magnetic conductive block in the present invention;

[0028] Attached Figure 6b It is a schematic diagram of the position of the magnetic conductive block in the present invention;

[0029] Attached Figure 7 It is a schematic diagram of the installation of the partition cover in the present invention;

[0030] Attached Figure 8 It is a schematic diagram of the magnetic field of the first arc track and the second arc track in the present invention; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0036] Example

[0037] When the existing DC circuit breaker (MCB) is used in a high-voltage DC environment, the arcing time is still too long and the product is burned. At the same time, when the traditional DC circuit breaker (MCB) uses magnetic blowing to extinguish the arc, the magnetic field arrangement cannot meet the requirement of non-polarity. In order to solve this technical problem, as shown in the attached Figure 1 , attached Figure 2 and attached Figure 3 As shown, this embodiment provides a DC dual-channel arc extinguishing structure of a circuit breaker, which includes an arc extinguishing chamber 1, an electromagnetic system 11 is placed above the arc extinguishing chamber, a magnetic conductive block 2 is arranged at the arc entrance of the arc extinguishing chamber 1, the engaging and separating parts of the moving contact 9 and the static contact 10 are located at the arc entrance of the arc extinguishing chamber 11, an arc striking angle 5 is arranged at the arc entrance of the arc extinguishing chamber 1 and is located below the engaging and separating parts of the moving contact 9 and the static contact 10, and one end of the bimetallic strip 12 and the terminal block 13 are connected to the arc striking angle. The first magnetic steel 3 and the second magnetic steel 4 are respectively installed on the outer surfaces of the first gas-producing part 7 and the second gas-producing part 8 on both sides of the arc entrance of the arc extinguishing chamber 1. Among them, the arc entrance refers to the area in front of the arc extinguishing chamber from the contact and separation of the moving contact and the static contact to generate the arc to the arc entering the arc extinguishing chamber and being extinguished by the arc extinguishing chamber grid. Generally speaking, the arc generated by the engagement and separation of the moving contact 9 and the static contact 1 moves at this arc entrance before entering the arc extinguishing chamber 1. The magnetic block 2 and the first magnetic steel 3 and the second magnetic steel 4 arranged on both sides of the arc inlet of the arc extinguishing chamber 1 respectively form corresponding first arc running tracks a and second arc running tracks b as shown in the attached figure Figure 8As shown, the magnetic field force in the first arc track a or the second arc track b can correspondingly make the corresponding forward arc or reverse arc generated by the circuit breaker receive a magnetic blowing force in the direction of the arc extinguishing chamber 1. When the forward current passes, the arc goes through one of the channels, and when the reverse current passes, the arc goes through the other channel. The dual channels can make the arcs in both the forward and reverse directions receive a magnetic blowing force in the direction of the arc extinguishing chamber, which can not only meet the non-polarity requirements when the high-voltage DC circuit breaker is used, but also the arc track formed by the first magnetic steel 3, the second magnetic steel 4 and the magnetic conductive block can enhance the magnetic blowing force, and can effectively improve the electrical life, breaking and critical performance of the non-polarity high-voltage DC circuit breaker.

[0038] The specific structure is: Figure 6b As shown, the magnetic conductive block 2 is located between the first magnetic steel 3 and the second magnetic steel 4. The polarity of the opposite side of the first magnetic steel 3 and the second magnetic steel 4 is the same. That is, the polarity of the side opposite to the first magnetic steel 3 and the second magnetic steel 4 is either N pole or S pole at the same time. At this time, the magnetic pole of the magnetic block 2 located at one side end between the first magnetic steel 3 and the second magnetic steel 4 corresponds to the polarity of the side opposite to the first magnetic steel 3 and the second magnetic steel 4, that is, when the polarity of the side opposite to the first magnetic steel 3 and the second magnetic steel 4 is either N pole at the same time, the magnetic pole of the magnetic block 2 located at one side end between the first magnetic steel 3 and the second magnetic steel 4 is S pole, when the polarity of the side opposite to the first magnetic steel 3 and the second magnetic steel 4 is either S pole at the same time, the magnetic pole of the magnetic block 2 located at one side end between the first magnetic steel 3 and the second magnetic steel 4 is N pole. In this way, the magnetic blocks 2 on both sides of the arc inlet of the arc extinguishing chamber 1 form a first arc track a (the first magnetic steel 3 and the magnetic block 2 on the corresponding side form the first arc track a) and a second arc track b (the second arc track b formed by the magnetic block 2 on the other side and the second magnetic steel 4) with opposite magnetic field directions. In this structure, the arc track formed by the first magnetic steel 3, the second magnetic steel 4 and the magnetic block 2 respectively forms two magnetic channels in different directions, namely, the first magnetic steel 3 and the magnetic block 2 form a magnetic channel in the NS (SN) direction, and the magnetic block 2 and the second magnetic steel 4 form a magnetic channel in the SN (NS) direction. When the current flows in from the wiring frame on the bimetallic element side, that is, when the positive current flows in, the arc enters the second arc track b under the action of the two magnetic channels of the first magnetic steel 3 and the magnetic block 2 (NS (SN) magnetic channel) and the magnetic block 2 and the second magnetic steel 4 (SN (NS) magnetic channel), and further accelerates to run in the direction of the arc extinguishing chamber under the action of the magnetic field of the second arc track itself; when the current flows in from the coil side and the reverse current flows in, the arc enters the first arc track a, and further accelerates to run in the direction of the arc extinguishing chamber under the action of the magnetic field of the first arc track itself. That is, regardless of the positive and negative currents flowing in, the dual-channel structure can effectively increase the magnetic blowing force of the arc, and improve the electrical life, breaking and critical performance of the non-polarity high-voltage DC circuit breaker.

[0039] Specifically, the installation method of the magnetic block 2 is as follows: Figure 6a The magnetic conductive block 2 shown is arranged on the arc striking angle 5 at the arc entrance of the arc extinguishing chamber 1 as shown in the attached Figure 6b Further, in this embodiment, in order to ensure that the magnetic block 2 is stably installed and not burned by the continuously burning arc, the first magnetic steel 3 and the second magnetic steel 4 arranged on both sides of the arc inlet of the arc extinguishing chamber 1 form corresponding first arc running tracks a and second arc running tracks b respectively, as shown in the attached Figure 7 As shown, the magnetic conductive block 2 is arranged in the inner cavity of the partition cover 6 on the arc striking angle 5 at the arc entrance of the arc extinguishing chamber 1, and the magnetic conductive block 2 is installed in the inner cavity of the partition cover 6 on the arc striking angle 5 at the arc entrance of the arc extinguishing chamber 1 through transition fit. In detail, the magnetic conductive block 2 is installed into the inner cavity of the partition cover 6 from the opening 601 on the partition cover 6 and is wrapped by the partition cover 6, so that the arc extinguishing cover 6 can prevent the arc from burning the magnetic conductive block 2 continuously, and the magnetic conductive block 2 is located between the first magnetic steel 3 and the second magnetic steel 4, the first magnetic steel 3 and the second magnetic steel 4 are permanent magnets, and the magnetic conductive block 2 is magnetized to produce corresponding magnetic poles under the action of the first magnetic steel 3 and the second magnetic steel 4.

[0040] Furthermore, as attached Figure 3 As shown in the attached Figure 5 The partition cover 6 shown is inserted into the Figure 4 The mounting hole 501 on the arc striking angle 5 is shown in the figure. Figure 5 As shown, a limiting feature part 602 is provided on one side of the bottom of the partition cover 6. In this embodiment, the limiting feature part 602 is a raised step. Figure 4 As shown, a limiter 501a corresponding to the limiter feature 1 602 is provided on one side of the mounting hole 501. In this embodiment, the limiter 501a is the edge of one side of the mounting hole 501. A limiter feature 2 603 is provided on one side of the top of the partition cover 6. In this embodiment, the feature 2 603 is a step, and a limiter 501b corresponding to the limiter feature 2 603 is provided on the other side of the mounting hole 501. In this embodiment, the limiter 2 501b is the edge of the other side of the mounting hole 501. With this structure, the arc isolation cover can be reliably and stably installed on the arc striking angle 5, and the magnetic conductive block is stably installed on the partition cover 6, thereby forming a stable first arc track a and a second arc track b with the first magnetic steel 3 and the second magnetic steel 4.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A DC dual-channel arc extinguishing structure of a circuit breaker, comprising an arc extinguishing chamber (1), characterized in that: A magnetic conductive block (2) is arranged at the arc entrance of the arc extinguishing chamber (1); the magnetic conductive block (2) and a first magnetic steel (3) and a second magnetic steel (4) arranged on both sides of the arc entrance of the arc extinguishing chamber (1) respectively form a corresponding first arc track (a) and a second arc track (b); the magnetic field force in the first arc track (a) or the second arc track (b) can correspondingly cause the corresponding forward arc or reverse arc generated by the circuit breaker to be subjected to a magnetic blowing force in the direction of the arc extinguishing chamber (1).

2. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The magnetic conductive block (2) is located between the first magnetic steel (3) and the second magnetic steel (4).

3. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The polarity of the opposite side of the first magnetic steel (3) and the second magnetic steel (4) is the same.

4. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The magnetic pole of one side end of the magnetic conductive block (2) located between the first magnetic steel (3) and the second magnetic steel (4) corresponds to the polarity of the side opposite to the first magnetic steel (3) and the second magnetic steel (4).

5. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The magnetic conductive block (2) is arranged on an arc striking angle (5) at an arc entrance of the arc extinguishing chamber (1).

6. A DC dual-channel arc extinguishing structure for a circuit breaker as claimed in claim 5, characterized in that: The magnetic conductive block (2) is arranged in the inner cavity of a partition cover (6) on an arc striking angle (5) at an arc entrance of the arc extinguishing chamber (1).

7. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 6, characterized in that: The magnetic conductive block (2) is installed into the inner cavity of the partition cover (6) through the opening (601) on the partition cover (6).

8. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 6, characterized in that: The partition cover (6) is inserted into the mounting hole (501) on the arc striking angle (5).

9. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 8, characterized in that: A limiting feature part 1 (602) is provided on one side of the bottom of the partition cover (6), a limiting feature part 1 (501a) corresponding to the limiting feature part 1 (602) is provided on one side of the mounting hole (501), a limiting feature part 2 (603) is provided on one side of the top of the partition cover (6), and a limiting feature part 2 (501b) corresponding to the limiting feature part 2 (603) is provided on the other side of the mounting hole (501).

10. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The magnetic conductive block (2) is installed in the inner cavity of a partition cover (6) on an arc striking angle (5) at an arc entrance of the arc extinguishing chamber (1) through transition fitting.

11. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The first magnetic steel (3) and the second magnetic steel (4) are respectively mounted on the outer surfaces of the first gas producing member (7) and the second gas producing member (8) on both sides of the arc entrance of the arc extinguishing chamber (1).

12. A DC dual-channel arc extinguishing structure for a circuit breaker according to claim 1, characterized in that: The engaging and separating position of the moving contact (9) and the stationary contact (10) is located at the arc entrance of the arc extinguishing chamber (1), and the arc striking angle (5) is arranged at the arc entrance of the arc extinguishing chamber (1) and is located below the engaging and separating position of the moving contact (9) and the stationary contact (10).

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