A disconnecting device

Abstract

The present invention relates to a disconnecting device, comprising a moving contact and a stationary contact, wherein the moving contact has a motion trajectory relative to the stationary contact to achieve the connection and disconnection of the disconnecting device. The moving contact also comprises an arc-extinguishing grid group formed by a plurality of arranged arc-extinguishing grids, the arc-extinguishing grid group being fixedly arranged on the side facing the motion trajectory, and a permanent magnet being fixedly arranged on the side of the arc-extinguishing grid group facing away from the motion trajectory. The direction from the motion trajectory toward the permanent magnet is defined as the up-down direction, and the permanent magnets are arranged in the up-down direction with their two magnetic poles oriented. The present invention arranges the permanent magnet outside the arc-extinguishing chamber, which can avoid the influence of the large amount of heat generated when the arc is generated, and will not cause high-temperature demagnetization. It can also attract the charged particles generated when the arc burns the contacts to rush out of the arc-extinguishing chamber, thereby improving the circuit breaker's disconnecting capacity. Only one permanent magnet is required for each pole circuit breaker to achieve the circuit breaker's non-polarity magnetic blowout arc extinguishing effect, greatly reducing costs.

Description

Technical Field

[0001] The invention relates to a breaking device, in particular to an improvement of a magnetic blow-out arc structure. Background Art

[0002] Improving the breaking capacity of circuit breakers has always been a key research topic within the industry. In recent years, with the development of new energy technologies, the rated operating voltage of DC circuit breakers has become increasingly higher, currently reaching 1500V. This increase in operating voltage places higher demands on the reliable breaking performance of circuit breakers, significantly increasing the difficulty of critical breaking.

[0003] Currently, commonly used techniques for enhancing arc extinguishing capabilities, such as lengthening the arc by increasing the gap and promoting and cooling the arc by burning gas-generating materials, cannot reliably interrupt the circuit under high DC voltages and limited space. Traditional single-use gas blowing makes it difficult to quickly draw the arc into the arc-extinguishing chamber for extinguishing. Furthermore, because DC current has no natural zero crossing, DC molded case circuit breakers have difficulty interrupting DC short-circuit currents, especially at high voltages.

[0004] Therefore, existing circuit breakers often use permanent magnets to provide an external magnetic field to lengthen the arc and quickly enter the arc extinguishing chamber. Figure 1-2 As shown, the circuit breaker includes a moving contact 200 and a stationary contact 100. The moving contact 200 can swing relative to the stationary contact 100 and realize the connection and disconnection of the circuit breaker by its motion trajectory. The arc extinguishing grid group 300 is arranged on one side of the motion trajectory of the moving contact 200 to extinguish the arc 400 generated during the disconnection process. A permanent magnet 500 is provided on both sides of the width direction of each arc extinguishing grid group 300. The magnetic poles of the permanent magnet 500 are arranged transversely along the width direction of the arc extinguishing grid group 300, so that the magnetic field direction of the permanent magnet 500 on the arc 400 is approximately transverse to the width direction of the grid. The magnetic field between the two opposing permanent magnets 500 generates an Ampere force F on the arc. A , so as to stretch the arc 400 to move toward the arc extinguishing grid group 300.

[0005] However, in this solution, the distribution of permanent magnets and the direction of arc current have certain configuration requirements, and the non-polarity condition cannot be achieved. Figure 2 If the current in arc 400 is reversed (i.e., the current flows outward from the paper), arc 400 will move toward the contact system, which is undesirable and detrimental to arc interruption. In many current applications (such as photovoltaic and wind power), DC circuit breakers face the possibility of interrupting reverse DC current. Therefore, this structure cannot be used in applications without polarity requirements.

[0006] In this regard, some manufacturers have developed a non-polarized magnetic arc extinguishing structure. For example, patent CN209071258U proposes a circuit breaker with a permanent magnet. Figure 1-3 As shown, the patent chooses to add a permanent magnet 4 to the grid 3, and the direction of the magnetic pole line of the permanent magnet 4 is parallel to the extension direction of the arc extinguishing grid 32, so that the direction of the magnetic field generated by the permanent magnet 4 on the arc is roughly along the longitudinal direction of the height of the grid. Therefore, regardless of whether the direction of the arc current is forward or reverse, the arc will be stretched toward the arc extinguishing grid 32 by the transverse Ampere force to extinguish the arc, thereby achieving the requirement of non-polarity.

[0007] However, in the structure of patent CN209071258U, the permanent magnet 4 is attached to the grid 3, which is already closely arranged. This makes it difficult to assemble the permanent magnet 4 on the grid 3. Furthermore, because the permanent magnet 4 is too close to the arc, the large amount of heat generated within the arc extinguishing chamber when the arc is generated will affect the magnetism of the permanent magnet 4, causing high-temperature demagnetization. Therefore, in this patent, the permanent magnet 4 must be enclosed in an insulating and heat-insulating housing 41, which increases cost and manufacturing difficulty. Furthermore, when the arc burns the contacts at high temperature, the large number of charged particles generated will be attracted by the permanent magnets 4 on both sides of the arc and will have difficulty escaping the arc extinguishing chamber, affecting the circuit breaker's next breaking capacity.

[0008] In addition, in the above two structures, the number of permanent magnets used in each arc extinguishing chamber ranges from 2 to 4, and the size is relatively large. A bipolar circuit breaker requires 4 to 8 permanent magnets, which are generally made of rare earth materials and are expensive. Summary of the Invention

[0009] Therefore, in order to solve the above problems, the present invention proposes a disconnecting device with optimized structure.

[0010] The present invention is implemented by the following technical solutions:

[0011] The present invention provides a disconnecting device, comprising a moving contact and a stationary contact, the moving contact having a motion trajectory relative to the stationary contact to achieve connection and disconnection of the disconnecting device, and an arc-quenching grid group formed by a plurality of arranged arc-quenching grids, the arc-quenching grid group being fixedly arranged on a side facing the motion trajectory, and a permanent magnet being fixedly arranged on a side of the arc-quenching grid group facing away from the motion trajectory, wherein the direction from the motion trajectory toward the permanent magnet is defined as the up-down direction, and the permanent magnets are arranged with their two magnetic poles oriented in the up-down direction.

[0012] The disconnecting device can be either unipolar or multipolar. Each pole of the multipolar disconnecting device includes the moving contact, the static contact, the permanent magnet and the arc extinguishing grid. The magnetic poles of the permanent magnets on two adjacent poles are arranged with opposite polarities.

[0013] Among them, based on manufacturing and installation considerations, in one embodiment, the permanent magnet is in a long strip shape, and the permanent magnet is arranged horizontally in the width direction of the arc extinguishing grid sheet or longitudinally in the arrangement direction of the arc extinguishing grid sheet.

[0014] Among them, in order to make the magnetic field coverage larger and the magnetic blowing effects on forward and reverse currents more uniform, in one embodiment, the permanent magnet is arranged centrally in the width direction of the arc extinguishing grid sheet.

[0015] Among them, based on manufacturing and installation considerations, in one embodiment, the breaking device further includes a housing above the arc extinguishing grid sheet group and facing away from the movement track, and the permanent magnet is fixedly arranged on the housing.

[0016] Among them, based on manufacturing and installation considerations, in one embodiment, the breaking device further includes a permanent magnet fixing member, and the permanent magnet is fixedly arranged on the housing through the permanent magnet fixing member.

[0017] Among them, in order to make the installation of the permanent magnet faster and more convenient, in one embodiment, the permanent magnet fixing member is fixedly connected to the housing, the permanent magnet fixing member has a receiving groove whose shape matches the outer shape of the permanent magnet, and the permanent magnet is inserted into the receiving groove.

[0018] Among them, in order to simplify the structure and save the manufacturing process flow, in one embodiment, a flow dividing cone for guiding air flow exhaust is fixedly arranged on the housing, and the permanent magnet is fixedly arranged on the flow dividing cone.

[0019] Among them, in order to adapt to the application occasion under small current, in one embodiment, the breaking device further includes a second permanent magnet and a third permanent magnet. The second permanent magnet and the third permanent magnet are fixedly arranged below the arc extinguishing grid sheet group and are respectively located on the left and right sides of the permanent magnet. The permanent magnet, the second permanent magnet and the third permanent magnet are arranged in a roughly "pin" shape. The pole of the second permanent magnet and the third permanent magnet relatively close to the lower pole of the permanent magnet is different from the lower pole of the permanent magnet, so as to strengthen the magnetic field below the permanent magnet.

[0020] Among them, as a preferred implementation scheme, the breaking device is a frame circuit breaker.

[0021] The present invention has the following beneficial effects: the present invention arranges the permanent magnet on the outside of the arc extinguishing chamber, which can avoid the influence of a large amount of heat when the arc is generated, and will not cause high-temperature demagnetization, compared with the solution of arranging the permanent magnet inside the arc extinguishing chamber. In addition, the permanent magnet in the present invention is arranged on the side of the arc extinguishing grid group that is opposite to the moving contact movement trajectory, so as to attract the charged particles generated when the arc burns the contact to rush out of the arc extinguishing chamber, eliminating the influence of the next disconnection of the circuit breaker. In addition, in the present invention, each pole circuit breaker only needs one permanent magnet to achieve the non-polarity magnetic blowout arc extinguishing effect of the circuit breaker, which greatly reduces the cost, and the installation and arrangement of the permanent magnet is also relatively simple, and the manufacturing and assembly process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of an existing circuit breaker with a permanent magnet;

[0023] Figure 2 This is a schematic diagram of the arc of an existing circuit breaker with a permanent magnet being accelerated by the Ampere force magnetic blowout;

[0024] Figure 3 is a structural exploded view of the DC frame circuit breaker in Example 1;

[0025] Figure 4 Schematic diagram of the moving contact, static contact, arc extinguishing grid assembly and permanent magnet of the DC frame circuit breaker in Example 1 (angle 1);

[0026] Figure 5 Schematic diagram of the moving contact, static contact, arc extinguishing grid assembly and permanent magnet of the DC frame circuit breaker in Example 1 (angle 2);

[0027] Figure 6 Schematic diagram (side view) of the arc being subjected to the Ampere force due to the magnetic field of the permanent magnet in Example 1;

[0028] Figure 7 Schematic diagram (top view) of the arc being subjected to the Ampere force due to the magnetic field of the permanent magnet in Example 1;

[0029] Figure 8 Schematic diagram of another optional arrangement of permanent magnets in Example 1 (side view);

[0030] Figure 9 Schematic diagram of another optional arrangement of permanent magnets in Example 1 (top view);

[0031] FIG10( a ) is a schematic diagram showing the arc moving toward the arc quenching grid assembly under the influence of two-stage Ampere force when the permanent magnet's S pole is facing downward and the arc current is directed inwards from the paper.

[0032] Figure 10(b) is a schematic diagram showing the arc moving towards the arc extinguishing grid group under the action of Ampere force in two stages when the S pole of the permanent magnet faces downwards and the direction of the arc current is outwards from the paper;

[0033] Figure 10(c) is a schematic diagram showing the arc moving towards the arc extinguishing grid group under the action of Ampere force in two stages when the N pole of the permanent magnet faces downwards and the direction of the arc current is inwards from the paper;

[0034] Figure 10(d) is a schematic diagram showing the arc moving towards the arc extinguishing grid group under the action of Ampere force in two stages when the N pole of the permanent magnet faces downwards and the direction of the arc current is outwards from the paper;

[0035] Figure 11 is a schematic diagram of the base and the permanent magnet fixing part of the DC frame circuit breaker in Embodiment 1;

[0036] Figure 12 is a schematic diagram (angle one) of the moving contact, static contact, arc extinguishing grid group and permanent magnet of the DC frame circuit breaker in Embodiment 2;

[0037] Figure 13 is a schematic diagram (angle two) of the moving contact, static contact, arc extinguishing grid group and permanent magnet of the DC frame circuit breaker in Embodiment 2;

[0038] Figure 14 is a schematic diagram showing the arc being subjected to Ampere force under the action of the magnetic field of the permanent magnet in Embodiment 2;

[0039] Figure 15 is a schematic diagram of the arc extinguishing chamber and the first permanent magnet, second permanent magnet and third permanent magnet distributed in a 'pin' shape in Embodiment 3. Detailed implementation manners

[0040] To further illustrate each embodiment, the present invention provides accompanying drawings. These accompanying drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used to explain the operation principle of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0042] Refer to Figure 3-5As shown, as a preferred embodiment of the present invention, a circuit breaker is provided, specifically a bipolar DC frame circuit breaker, including a base 10, a side plate 20, a mask 30, an auxiliary switch 40, an opening and closing electromagnet 50, an energy storage motor 60, an operating mechanism 70 and an arc extinguishing chamber 80. Each pole circuit part includes a moving contact 1 and a static contact 2. The moving contact 1 has a motion trajectory 90 relative to the static contact 2. According to the motion trajectory 90, the moving contact 1 and the static contact 2 are closed or separated, thereby realizing the connection or disconnection of the circuit breaker. When the moving contact 1 and the static contact 2 are separated, an arc is generated between the two. For ease of understanding, this example schematically shows the arc 5 between the moving contact 1 and the static contact 2. The arc extinguishing chamber 80 is used to extinguish the arc 5, wherein the arc extinguishing chamber 80 includes an arc extinguishing grid group 3, which is composed of multiple arc extinguishing grids arranged linearly. The arc extinguishing grid group 3 is fixedly arranged on one side of the movement trajectory 90 of the moving contact 1 to extinguish the arc 5.

[0043] This embodiment further includes a permanent magnet 4 to extinguish the arc 5 by magnetic blow acceleration. The permanent magnet 4 is disposed on the side of the arc extinguishing grid group 3 facing away from the motion trajectory 90 of the moving contact 1. Furthermore, the north and south poles of the permanent magnet 4 are arranged along the direction of the arc extinguishing grid group 3 facing away from the motion trajectory 90. For ease of description, the direction from the motion trajectory 90 toward the permanent magnet 4 is defined as the up-down direction, i.e., the permanent magnet 4 is relatively located at the upper end of the motion trajectory 90, and the motion trajectory 90 is relatively located at the lower end of the permanent magnet 4. The line connecting the north and south poles of the permanent magnet 4 is arranged along the up-down direction, and the two adjacent permanent magnets 4 in the two poles of the bipolar circuit breaker are arranged with opposite polarities, as shown in FIG. Figure 6-7 In the arrangement of the permanent magnet 4 in this embodiment, the direction of the magnetic field to which the arc 5 below the permanent magnet 4 is subjected is generally upward or downward. The arc below the permanent magnet 4 is affected by the magnetic field of the permanent magnet 4 and is subjected to the Ampere force F along the width direction of the arc extinguishing grid group 3. a , causing the arc 5 to be stretched laterally after entering the arc-extinguishing grid assembly 3, thereby improving the arc extinguishing effect. Regardless of the direction of the arc 5's current, the arc 5 will be stretched laterally after entering the arc-extinguishing grid assembly 3, but the direction of the magnetic stretching will be different. Therefore, the circuit breaker itself has no polarity requirements.

[0044] In this embodiment, the specific direction of the N pole and S pole of the permanent magnet 4 facing upward and downward does not affect the specific magnetic blowing effect, so in other embodiments, it can also be as follows. Figure 7-8 The two permanent magnets 4 are arranged with opposite polarities to those in this embodiment.

[0045] The more important function of the arrangement structure of the permanent magnet 4 in this embodiment is that the permanent magnet 4 can also magnetically blow the arc toward the arc quenching grid assembly 3, thereby accelerating the arc into the arc quenching grid assembly 3. Referring to Figures 10(a), 10(b), 10(c), and 10(d), four different directions of the Ampere force on the arc are shown under different arrangements of the permanent magnet 4 and arc current directions. It can be seen that when the arc is subjected to the Ampere force F a1 In the first stage (indicated by the dotted line in the figure), the arc is stretched to one side in the horizontal direction. a2 In the second stage, the arc is magnetically blown obliquely upward toward the arc-quenching grids, accelerating arc extinction, shortening arcing time, and reducing arcing energy. Regardless of the current direction, the effect is similar: the arc moves toward the arc-quenching grid assembly 3 under the magnetic field of the permanent magnet 4, meeting the current non-polarity requirement.

[0046] In this embodiment, permanent magnets 4 are positioned outside the arc extinguishing chamber. Compared to solutions that place permanent magnets inside the arc extinguishing chamber, this avoids the effects of significant heat generated during arc generation, prevents high-temperature demagnetization, and eliminates the need for a thermally insulating outer shell, reducing manufacturing costs and assembly difficulty. Furthermore, in this embodiment, permanent magnets 4 are positioned on the side of the arc extinguishing grid assembly 3 facing away from the motion trajectory 90 of the moving contact 1. This allows charged particles generated by the arc eroding the contacts to escape from the arc extinguishing chamber, eliminating the impact on the next tripping of the circuit breaker. Furthermore, in this embodiment, only one permanent magnet 4 is required per pole of the circuit breaker to achieve the polarity-neutral magnetic blowout effect, significantly reducing costs.

[0047] Although this example uses a two-pole circuit breaker for illustration, it is obvious that the permanent magnet 4 can also be used in a single-pole circuit breaker or a circuit breaker with more poles, such as a three-pole or four-pole circuit breaker. If it is a multi-pole circuit breaker, the permanent magnets 4 of adjacent poles need to be arranged with opposite polarities to ensure that the direction of the magnetic field to which the arc 5 below the permanent magnet 4 is subjected is generally upward or downward.

[0048] Since only one permanent magnet 4 is required for each pole circuit breaker in this embodiment, the installation and arrangement of the permanent magnet 4 is relatively simple. Figure 3 and Figure 11As shown, the circuit breaker further includes a permanent magnet fixing member 6, which is fixedly connected to the side plate 20. The permanent magnet fixing member 6 has a receiving groove 61 whose shape matches the shape of the permanent magnet 4, and the permanent magnet 4 is inserted into the receiving groove 61. Of course, in other embodiments, permanent magnet fixing members with other structures can also be used, such as snap-on or screw-on permanent magnet fixing members. In addition to using permanent magnet fixing members to fix the permanent magnet, in other embodiments, the permanent magnet 4 can also be directly fixed to the base or side plate (the base and side plate are collectively referred to as the circuit breaker housing), for example, forming a mounting groove for mounting the permanent magnet 4 on the base or side plate. Since the permanent magnet 4 in this embodiment is arranged on the side of the arc extinguishing grid group 3 facing away from the movement trajectory 90 of the moving contact 1, the permanent magnet 4 can be conveniently installed on the base or side panel. Furthermore, a diverter cone 101 is also provided on the base or side panel on the side of the arc extinguishing grid group 3 facing away from the movement trajectory 90 of the moving contact 1 to guide the airflow and exhaust. The permanent magnet 4 can be directly installed on the diverter cone 101 to simplify the structure and save the process flow.

[0049] Example 2:

[0050] like Figure 12-14 This embodiment provides a bipolar DC frame circuit breaker having a structure similar to that of the circuit breaker in Example 1, the only difference being the arrangement of the permanent magnets 4' in this embodiment. The permanent magnets 4 in Example 1 and the permanent magnets 4' in this embodiment are both long strips. While the permanent magnets 4 in Example 1 are arranged transversely along the width of the arc-quenching grids, the permanent magnets 4' in this embodiment are arranged longitudinally along the arrangement direction of the arc-quenching grids.

[0051] In other embodiments, the permanent magnets 4' can be arranged at an angle relative to the arrangement of the arc-quenching grids. This arrangement can be performed with the north and south poles of the permanent magnets positioned one above the other, and with adjacent magnets facing opposite poles. Because the magnetic field of the permanent magnets is distributed throughout the arc-quenching space, the resulting magnetic blowout effect is similar regardless of the specific placement angle of the permanent magnets or their specific position along the width of the arc-quenching grid assembly 3. Therefore, the arrangement of the permanent magnets 4' is highly flexible. This embodiment utilizes elongated permanent magnets for ease of manufacture and assembly. However, other permanent magnet shapes, such as cylindrical or irregular, are also feasible.

[0052] As a preferred embodiment, the permanent magnet 4' is arranged centrally in the width direction of the arc extinguishing grid group 3 so that its magnetic field covers a larger range and its effect on the magnetic blowing of the arc into the arc extinguishing chamber is more uniform regardless of the current polarity.

[0053] Example 3:

[0054] This embodiment proposes further improvements based on Embodiment 1 and Embodiment 2. In Embodiment 1 and Embodiment 2, the magnetic field of one permanent magnet affects one-pole circuit breakers, and its magnetic force is relatively small, which is suitable for circuit breakers with large current specifications (2500A - 10KA). In this embodiment, the magnetic force is strengthened to adapt to circuit breakers with small current specifications (2A - 2500A).

[0055] This embodiment is specifically implemented as follows: Refer to Figure 15 , the first permanent magnet 11 is arranged above the arc extinguishing chamber 14背离 the moving contact movement trajectory. In addition, second permanent magnets 12 and third permanent magnets 13 distributed on both sides of the first permanent magnet 11 are arranged below the arc extinguishing chamber 14朝向 the moving contact movement trajectory. The first permanent magnet 11, the second permanent magnet 12, and the third permanent magnet 13 are generally arranged in a "pin" shape. The magnetic pole orientations of the second permanent magnet 12 and the third permanent magnet 13 are transverse to the width direction of the arc extinguishing grid plates. One pole of the second permanent magnet 12 and the third permanent magnet 13相对靠近 the lower pole of the first permanent magnet 11 (shown as the S pole in the figure) is different from the lower pole of the first permanent magnet 11, so that the magnetic field below the first permanent magnet 11 is strengthened under the action of the magnetic fields of the second permanent magnet 12 and the third permanent magnet 13, enabling this Embodiment 3 to be applicable to applications with small current specifications and having a large magnetic blow effect.

[0056] In addition, in this example, since the added second permanent magnet 12 and third permanent magnet 13 are relatively close to the arc compared to the above-mentioned Embodiment 1 and 2, anti-demagnetization protection can also be carried out by coating with a heat-insulating outer shell (similar to CN209071258U), so as to still maintain the effect of "strengthening the magnetic field below the first permanent magnet 11 to improve the arc extinguishing ability of the circuit breaker under small currents" after long-term use. However, it should be noted that this Embodiment 3 mainly relies on the first permanent magnet 11 arranged below the arc extinguishing chamber 14朝向 the moving contact movement trajectory to achieve the basic effects similar to those of Embodiment 1 and 2; therefore, in some application scenarios considering manufacturing costs, whether the functions of the second permanent magnet 12 and the third permanent magnet 13 as auxiliary magnetic field strengthening can be achieved for long-term use can be a lower consideration factor, and thus the use of their corresponding heat-insulating outer shells can be omitted.

[0057] The above embodiments are all described by taking frame circuit breakers as examples, but the arrangement structure of the permanent magnets can also be applied to other breaking devices, such as disconnect switches.

[0058] Although the present invention has been specifically shown and described in conjunction with the preferred implementation embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. A disconnecting device comprising a movable contact and a stationary contact, wherein the movable contact has a motion trajectory relative to the stationary contact to achieve switching on and off of the disconnecting device, and further comprising an arc-quenching grid assembly formed by a plurality of arranged arc-quenching grids, wherein the arc-quenching grid assembly is fixedly disposed on a side facing the motion trajectory, characterized in that: It further includes a permanent magnet, which is fixedly arranged on one side of the arc extinguishing grid group facing away from the movement track. Defining the direction from the movement track towards the permanent magnet as the up-down direction, the two magnetic poles of the permanent magnet are arranged along the up-down direction. The breaking device has multiple poles, and each pole includes the moving contact, the static contact, the permanent magnet and the arc extinguishing grid. The magnetic poles of the permanent magnets on two adjacent poles are arranged with opposite polarities.

2. The disconnecting device according to claim 1, characterized in that: The permanent magnet is in a long strip shape and is arranged horizontally along the width direction of the arc extinguishing grid or longitudinally along the arrangement direction of the arc extinguishing grid.

3. The disconnecting device according to claim 2, characterized in that: The permanent magnet is arranged in the middle in the width direction of the arc extinguishing grid.

4. The disconnecting device according to claim 1, characterized in that: It further includes a housing above the arc extinguishing grid group facing away from the movement track, and the permanent magnet is fixedly arranged on the housing.

5. The disconnecting device according to claim 4, characterized in that: It further includes a permanent magnet fixing member, and the permanent magnet is fixedly arranged on the housing through the permanent magnet fixing member.

6. The disconnecting device according to claim 5, characterized in that: The permanent magnet fixing member is fixedly connected to the housing. The permanent magnet fixing member has a receiving groove with a shape matching the outer shape of the permanent magnet, and the permanent magnet is inserted into the receiving groove.

7. The disconnect device according to claim 4, characterized in that: A flow dividing cone for guiding the exhaust of air flow is fixedly arranged on the housing, and the permanent magnet is fixedly arranged on the flow dividing cone of the housing.

8. The disconnect device according to claim 1, characterized in that: It further includes a second permanent magnet and a third permanent magnet. The second permanent magnet and the third permanent magnet are fixedly arranged below the arc extinguishing grid group and are respectively located on the left and right sides of the permanent magnet. The permanent magnet, the second permanent magnet and the third permanent magnet are generally arranged in a "pin" shape. The pole of the second permanent magnet and the third permanent magnet relatively close to the lower magnetic pole of the permanent magnet is different from the lower magnetic pole of the permanent magnet, so as to strengthen the magnetic field below the permanent magnet.

9. The disconnecting device according to any one of claims 1 to 8, characterized in that: The breaking device is a frame circuit breaker.

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