Magnetic drive arc structure and direct current arc extinguishing system
By adopting a magnetic arc structure in high-voltage DC current breakage and using magnets and permanent magnets to build a three-dimensional magnetic field, the problem that traditional solutions are difficult to break off the polarity DC current under high voltage is solved, and a fast and economical current breakage effect is achieved.
Patent Information
- Application Number
- CN202411972124.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-03-04
AI Technical Summary
The prior art is difficult to effectively disconnect polarity DC current under high voltage, and the traditional solution design is complex and costly.
A magnetically driven arc structure is adopted, including an arc extinguishing chamber, a static arc angle, a dynamic arc angle, a magnet and a permanent magnet. By constructing a special three-dimensional magnetic field distribution, the arc quickly moves to the arc extinguishing chamber under the action of a magnetic field, thereby achieving direct current breakdown in all directions.
It realizes rapid and reliable disconnection of polarity DC current under high voltage. It has a simple structure, low cost and good economicality. It is suitable for high voltage DC current disconnection.
Smart Images
Figure CN119560324A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to a low-voltage direct current arc extinguishing technology, and in particular to an optimized magnetically driven arc structure and a direct current arc extinguishing system. Background Art
[0002] In a photovoltaic system, the DC side mainly includes photovoltaic modules, DC combiner boxes, DC distribution cabinets, and inverters. Since the direction of the DC power generated by photovoltaic modules during the power generation process is fixed (flowing from the positive pole of the photovoltaic module to the negative pole), it may be necessary to perform non-polarity disconnection on the DC circuit during system maintenance, troubleshooting, or special operating conditions. At this time, the control and protection devices on the DC side (such as DC circuit breakers, disconnectors, etc.) need to have non-polarity current disconnection capabilities to ensure the safe and stable operation of the system.
[0003] During the charging and discharging process of energy storage systems (such as battery energy storage systems), the direction of DC current changes. When charging, the current flows from the grid or other power source to the energy storage battery; when discharging, the current flows from the energy storage battery to the load or grid. Therefore, the control and protection devices on the DC side of the energy storage system also need to have non-polarity current breaking capabilities to adapt to the frequent changes in current direction. When breaking the current, these electrical devices should not be affected by the current direction, but should be able to quickly and reliably cut off the circuit to prevent the fault from expanding or causing equipment damage.
[0004] Therefore, for photovoltaic systems and energy storage systems, the control and protection devices on their DC side have the requirement to disconnect non-polarized current. The traditional disconnection method usually uses permanent magnets to drive the arc to lengthen it and enter the arc extinguishing chamber, so that the arc voltage increases to achieve the purpose of disconnecting the arc. This method can only disconnect polarized DC current with a fixed current direction; however, the characteristic of non-polarized DC current is that it does not distinguish the current direction. Therefore, for the disconnection of non-polarized DC current without a fixed current direction, the permanent magnet solution used for disconnecting polarized DC current will not be used. The existing solutions for non-polar DC current interruption include increasing the opening distance, using gas-producing materials, and narrow-slit arc extinguishing. Increasing the opening distance means increasing the opening distance between the contacts to reduce the arc maintenance voltage, making the arc easier to extinguish, but it requires a large space and has limited effect under high voltage; using gas-producing materials to generate a large amount of gas under the action of the arc, and extinguishing the arc through the cooling and dilution of the gas, but the selection and preparation of gas-producing materials are relatively complicated, and harmful gases may be generated; using a narrow slit structure to divide the arc into multiple small segments, and accelerating the extinction of the arc by increasing the heat dissipation area and resistance of the arc, but the design is complex and has high requirements for materials. Therefore, although increasing the opening distance, using gas-producing materials, and narrow-slit arc extinguishing can improve the interruption capacity to a certain extent, it is often accompanied by an increase in cost and volume. To achieve DC current interruption at a higher voltage, the cost and volume required are usually large, and the economy is poor. Summary of the invention
[0005] In view of the problems of complex design and high cost of high-voltage stepless DC current breaking structure in the prior art, the present invention provides a magnetically driven arc structure and a DC arc extinguishing system.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a magnetically driven arc structure, comprising an arc extinguishing chamber, wherein a static arc angle is arranged on one side of the arc extinguishing chamber, the static arc angle is connected to a static conductive rod, and a static contact is arranged on the static conductive rod; a moving arc angle is arranged on the other side of the arc extinguishing chamber, and the moving arc angle is sequentially connected to a moving contact and a moving conductive rod; a first arc isolation wall is arranged on one side of a corresponding position of the moving contact and the static contact, and a second arc isolation wall is arranged on the other side; the first arc isolation wall and the second arc isolation wall are arranged opposite to each other; A first magnetic conductor and a first permanent magnet are sequentially arranged at a position of the static conductive rod on a side away from the moving arc angle and opposite to the static contact; A second permanent magnet and a second magnetic conductor are sequentially arranged on the side of the moving arc angle away from the static arc angle; the polarity of the polar surface of the first permanent magnet facing the moving arc angle is opposite to the polarity of the polar surface of the second permanent magnet facing the static arc angle.
[0007] Optionally, the first magnetic conductor is a U-shaped structure, and the opening of the U-shaped structure faces the static contact.
[0008] Optionally, an end surface of the U-shaped structure of the first magnetic conductor is higher than the static contact.
[0009] Optionally, the opening width of the U-shaped structure of the first magnetic conductor is greater than or equal to the width of the static contact.
[0010] Optionally, the second magnetic conductor includes a U-shaped portion, two walls of the U-shaped portion are respectively connected to connecting arms, and the connecting arms are connected to arc-shaped walls.
[0011] Optionally, the arc-shaped wall extends from a region between the moving contact and the stationary contact to an edge of the arc extinguishing chamber.
[0012] Optionally, the two walls of the U-shaped portion, the connecting arm and the arc-shaped wall are all located outside the first arc isolation wall and the second arc isolation wall.
[0013] Optionally, the first magnetic conductor and the second magnetic conductor are made of ferromagnetic material.
[0014] Optionally, there is a gap between the first magnetic conductor and the second magnetic conductor, or the first magnetic conductor and the second magnetic conductor are separated by insulating material.
[0015] The present invention also provides a DC arc extinguishing system, comprising the above-mentioned magnetically driven arc structure.
[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a magnetically driven arc structure, comprising an arc extinguishing chamber, wherein a static arc angle is arranged on one side of the arc extinguishing chamber, the static arc angle is connected to a static conductive rod, and a static contact is arranged on the static conductive rod; a moving arc angle is arranged on the other side of the arc extinguishing chamber, and the moving arc angle is sequentially connected to a moving contact and a moving conductive rod; a first arc isolation wall is arranged on one side of corresponding positions of the moving contact and the static contact, and a second arc isolation wall is arranged on the other side, and the first arc isolation wall and the second arc isolation wall are arranged opposite to each other; a first magnetic conductor and a first permanent magnet are arranged in sequence at a position of the static conductive rod away from the moving arc angle relative to the static contact; a second permanent magnet and a second magnetic conductor are arranged in sequence on a side of the moving arc angle away from the static arc angle; the polarity of the polarity surface of the first permanent magnet facing the moving arc angle is opposite to the polarity of the polarity surface of the second permanent magnet facing the static arc angle. When performing non-polarity DC disconnection, taking the polarity surface of the first permanent magnet facing the moving arc angle as an N pole as an example, after the first magnet is magnetized by the first permanent magnet, the first magnet presents an N pole; the polarity surface of the second permanent magnet close to the static arc angle is an S pole, and the moving arc angle is magnetized by the other polarity surface of the second permanent magnet, and the side of the moving arc angle facing the static arc angle presents an S pole; after the second magnet is magnetized by the polarity surface, the two side walls of the second magnet present an N pole. Under the above-constructed magnetic field, there is a magnetic field component in the arc motion chamber that is parallel to the plane of the arc isolation wall and points to the direction of the moving arc angle, which is called the first magnetic field component; there is also a magnetic field component perpendicular to the first arc isolation wall and pointing to the second arc isolation wall, which is called the second magnetic field component, and a magnetic field component perpendicular to the second arc isolation wall and pointing to the first arc isolation wall, which is called the third magnetic field component. If the current direction of the DC arc is from the moving contact to the stationary contact, the arc will be biased toward the first arc-isolating wall under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc-extinguishing chamber along the surface of the first arc-isolating wall under the action of the second magnetic field component; conversely, if the current direction of the DC arc is from the stationary contact to the moving contact, the arc will be biased toward the second arc-isolating wall under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc-extinguishing chamber along the surface of the second arc-isolating wall under the action of the third magnetic field component. Therefore, no matter what the current direction of the DC arc is, the arc will move rapidly toward the arc-extinguishing chamber under the action of the above magnetic field, thereby realizing the disconnection of DC power in all directions. The structure is simple, the transformation cost is low, and it is easy to implement. It can better meet the requirements of high-voltage DC current disconnection and has good economic efficiency.
[0017] The first magnetic conductor is a U-shaped structure, and the opening of the U-shaped structure faces the static contact. The structure is compact, which not only saves most of the space, but also maximizes the magnetic force to obtain a uniform and stable magnetic field, and can better realize the magnetic drive function.
[0018] The second magnetic conductor includes a U-shaped portion, and the two walls of the U-shaped portion are respectively connected to connecting arms, and the connecting arms are connected to an arc-shaped wall; the arc-shaped wall extends from the area between the moving contact and the stationary contact to the edge of the arc extinguishing chamber. In addition to being able to efficiently concentrate and conduct the magnetic field, the magnetic field distribution is further optimized, making the magnetic field more stable, reducing energy loss, and improving overall performance. The design of the arc-shaped wall helps to guide the arc generated between the moving contact and the stationary contact. When the arc is generated, the arc-shaped wall can guide it into the arc extinguishing chamber, thereby effectively reducing the damage of the arc to the contacts and equipment.
[0019] The two walls of the U-shaped portion, the connecting arm and the arc-shaped wall are all located outside the first arc isolation wall and the second arc isolation wall, so as to separate the electric arc from the second magnetic conductor.
[0020] There is a gap between the first magnetic conductor and the second magnetic conductor or the two conductors are separated by insulating materials, thereby preventing magnetic short circuit and magnetic flux leakage, so that the magnetic flux flows more concentratedly through a predetermined path.
[0021] The present invention also provides a DC arc extinguishing system, including the above-mentioned magnetic drive arc structure. Due to the effect of the magnetic field of the magnetic drive arc structure, the DC arc extinguishing system can quickly guide the arc to the predetermined arc extinguishing area, which helps to reduce the residence time of the arc in the contact or inside the device, thereby reducing damage to the device, and has a higher arc extinguishing efficiency. It can significantly reduce the risk of contact damage due to arc ablation, which is of great significance for improving the service life and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is an axial schematic diagram of a magnetically driven arc structure of the present invention.
[0023] Figure 2 It is a front view of a magnetically driven arc structure of the present invention.
[0024] Figure 3 It is a schematic diagram of the second magnetic conductor structure of the present invention.
[0025] Figure 4 The arc voltage waveform is for the magnetically driven arc structure that does not include the first permanent magnet and the first magnetic conductor at a DC voltage of 500V, a time constant of 2ms, and a current interruption of 63A.
[0026] Figure 5 This is the arc voltage waveform of the magnetic driven arc structure of Example 2 of the present invention at 500V DC voltage, 2ms time constant, and 63A current interruption.
[0027] Among them, 1-moving conductive rod, 2-moving contact, 3-moving arc angle, 4-static conductive rod, 5-static contact, 6-static arc angle, 7-first permanent magnet, 8-first magnetic conductor, 9-second permanent magnet, 10-second magnetic conductor, 11-first arc isolation wall, 12-second arc isolation wall, 13-arc extinguishing chamber, 101-U-shaped part, 102-connecting arm, 103-arc wall. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0031] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0032] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0033] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.
[0035] Example 1 See also Figure 1 and Figure 2 The present invention discloses a magnetically driven arc structure, comprising an arc extinguishing chamber 13, wherein a static arc angle 6 is arranged on one side of the arc extinguishing chamber 13, wherein the static arc angle 6 is connected to a static conductive rod 4, and a static contact 5 is arranged on the static conductive rod 4; a moving arc angle 3 is arranged on the other side of the arc extinguishing chamber 13, wherein the moving arc angle 3 is sequentially connected to a moving contact 2 and a moving conductive rod 1; a first arc isolation wall 11 is arranged on one side of the corresponding positions of the moving contact 2 and the static contact 5, and a second arc isolation wall 12 is arranged on the other side, wherein the first arc isolation wall 11 is arranged opposite to the second arc isolation wall 12; a first magnetic conductor 8 and a first permanent magnet 7 are sequentially arranged on a side of the static conductive rod 4 away from the dynamic arc angle 3 relative to the position of the static contact 5; a second permanent magnet 9 and a second magnetic conductor 10 are sequentially arranged on a side of the dynamic arc angle 3 away from the static arc angle 6; the polarity of the polar surface of the first permanent magnet 7 facing the moving arc angle 3 is opposite to the polarity of the polar surface of the second permanent magnet 9 facing the static arc angle 6.
[0036] When performing non-polarity DC disconnection, taking the polarity surface of the first permanent magnet 7 facing the moving arc angle 3 as an N pole as an example, after the first magnet 8 is magnetized by the first permanent magnet 7, the first magnet 8 presents an N pole; the polarity surface of the second permanent magnet 9 close to the static arc angle 6 is an S pole, and the moving arc angle 3 is magnetized by the other polarity surface of the second permanent magnet, and the side of the moving arc angle 3 facing the static arc angle 6 presents an S pole; after the second magnet 10 is magnetized by the polarity surface, the two side walls of the second magnet 10 present N poles. Under the above-constructed magnetic field, there is a magnetic field component in the arc motion chamber that is parallel to the arc isolation wall plane and points to the direction of the moving arc angle 3, which is called the first magnetic field component; there is also a magnetic field component perpendicular to the first arc isolation wall 11 and pointing to the second arc isolation wall 12, which is called the second magnetic field component, and a magnetic field component perpendicular to the second arc isolation wall 12 and pointing to the first arc isolation wall 11, which is called the third magnetic field component. If the current direction of the DC arc is from the moving contact 2 to the stationary contact 5, the arc will be biased toward the first arc isolation wall under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc extinguishing chamber 13 along the surface of the first arc isolation wall 11 under the action of the second magnetic field component; conversely, if the current direction of the DC arc is from the stationary contact 5 to the moving contact 2, the arc will be biased toward the second arc isolation wall 12 under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc extinguishing chamber along the surface of the second arc isolation wall 12 under the action of the third magnetic field component. Therefore, no matter what the current direction of the DC arc is, the arc will move rapidly toward the arc extinguishing chamber 13 under the action of the above-mentioned magnetic field, thereby realizing the disconnection of DC power in all directions. The structure is simple, the transformation cost is low, and it is easy to implement. It can better meet the high-voltage DC current disconnection and has good economic efficiency.
[0037] Example 2 See also Figure 1 and Figure 2 The present invention discloses a magnetically driven arc structure, comprising a moving conductive rod 1, a moving contact 2, a moving arc angle 3, a static conductive rod 4, a static contact 5, a static arc angle 6, a first permanent magnet 7, a first magnetic conductor 8, a second permanent magnet 9, a second magnetic conductor 10, a first arc isolation wall 11, a second arc isolation wall 12 and an arc extinguishing chamber 13; The arc extinguishing chamber 13 is located in the opening direction of the moving contact 2 and the static contact 5 in the open state, and is sandwiched between the static arc angle 6 and the moving arc angle 3; The moving contact 2 is fixed on the moving conductive rod 1; the static contact 5 is fixed on the static conductive rod 4; the static arc angle 6 is connected to one end of the static conductive rod 4 close to the arc extinguishing chamber 13; The first permanent magnet 7 and the first magnetizer 8 are fixedly installed on the side of the static arc angle 6 away from the moving arc angle 3, and the first magnetizer 8 is located between the first permanent magnet 7 and the static arc angle 6; the first magnetizer 8 is a U-shaped structure, and the U-shaped opening faces the moving arc angle 3 or the moving contact 2; the upper end of the first magnetizer 8 is higher than the upper end of the static contact 5, and the static contact 5 is located in the opening direction of the U-shaped structure of the first magnetizer 8, and the U-shaped opening width of the first magnetizer 8 is greater than or equal to the width of the static contact 5, and the static contact 5 coincides with the symmetry plane of the first magnetizer 8 parallel to the wall of the U-shaped opening; the first polarity plane of the first permanent magnet 7 is the polarity plane close to the outer side of the bottom of the first magnetizer 8.
[0038] The second permanent magnet 9 and the second magnetic conductor 10 are fixedly mounted on a side of the moving arc angle 3 away from the static arc angle 6, and the second permanent magnet 9 is located between the second magnetic conductor 10 and the moving arc angle 3; see Figure 3 The second magnetic conductor 10 includes a U-shaped portion 101, the two walls of the U-shaped portion 101 are symmetrically arranged, and are respectively connected with a connecting arm 102 and an arc wall 103 in sequence, and the opening direction of the U-shaped portion 101 faces the static arc angle 6. The dynamic arc angle 3 is located inside the U-shaped portion 101, and the bottom of the U-shaped portion 101 is the second magnetic conductor 10 and the dynamic arc angle 3 in sequence toward the static arc angle 6; the two side walls of the U-shaped portion 101 are respectively located outside the first arc isolation wall 11 and the second arc isolation wall 12, separating the second magnetic conductor 10 from the arc; the arc wall 103 extends from the area between the moving contact 2 and the static contact 5 to the edge of the arc extinguishing chamber 13; the first polarity surface of the second permanent magnet 9 faces the dynamic arc angle 3, the second polarity surface of the second permanent magnet 9 faces the bottom of the U-shaped portion 101, and the first polarity surface of the first permanent magnet 7 is opposite to the first polarity surface of the second permanent magnet 9.
[0039] There is a gap between the first magnetic conductor 8 and the second magnetic conductor 10 , or they are separated by the insulating materials of the first arc isolation wall 11 and the second arc isolation wall 12 .
[0040] The first arc isolation wall 11 and the second arc isolation wall 12 are located on both sides of the corresponding positions of the moving contact 2 and the static contact 5; Preferably, the first magnetic conductor 8 and the second magnetic conductor 10 are made of ferromagnetic materials.
[0041] Preferably, the first arc isolation wall 11 and the second arc isolation wall 12 are made of high temperature resistant gas-producing material or non-gas-producing material.
[0042] The working principle of the magnetic driven arc structure provided in this embodiment is: Taking the first polarity plane of the first permanent magnet 7 as an N pole as an example: after the U-shaped outer bottom surface of the first magnet 8 is magnetized by the first polarity plane of the first permanent magnet 7, the bottom and two side walls of the U-shaped structure of the first magnet 8 both present N poles to the outside; the first polarity plane of the second permanent magnet 9 is an S pole, and the moving arc angle 3 is magnetized by the first polarity plane of the second permanent magnet 9, and the side of the moving arc angle 3 facing the static arc angle 6 presents an S pole; the second polarity plane of the second permanent magnet 9 is an N pole, and after the inner bottom surface of the U-shaped portion 101 of the second magnet 10 is magnetized by the second polarity plane of the second permanent magnet 9, the two side walls of the U-shaped portion 101 present N poles. Under the magnetic field constructed as above, the chamber formed by the moving contact 2, the static contact 5, the moving arc angle 3, the static arc angle 6, the first arc isolation wall 11 and the second arc isolation wall 12 in the arc movement chamber has a magnetic field component parallel to the arc isolation wall plane and pointing in the direction of the moving arc angle 3, which is called the first magnetic field component; there is also a magnetic field component perpendicular to the first arc isolation wall 11 and pointing to the second arc isolation wall 12, which is called the second magnetic field component, and a magnetic field component perpendicular to the second arc isolation wall 12 and pointing to the first arc isolation wall 11, which is called the third magnetic field component. If the current direction of the DC arc is from the moving contact 2 to the stationary contact 5, the arc will be biased toward the first arc isolation wall 11 under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc extinguishing chamber 13 along the surface of the first arc isolation wall 11 under the action of the second magnetic field component; conversely, if the current direction of the DC arc is from the stationary contact 5 to the moving contact 2, the arc will be biased toward the second arc isolation wall 12 under the action of the magnetic field force generated by the first magnetic field component, and then move rapidly toward the arc extinguishing chamber 13 along the surface of the second arc isolation wall 12 under the action of the third magnetic field component. Therefore, no matter what the current direction of the DC arc is, the arc will move rapidly toward the arc extinguishing chamber 13 under the action of the above magnetic field.
[0043] If the polarity of the first polarity plane of the first permanent magnet 7 is an S pole, the polarity of the first polarity plane of the second permanent magnet 9 is an N pole. Accordingly, the bottom and two side walls of the U-shaped structure of the first magnetizer 8 are both S poles to the outside, the side of the moving arc angle 3 facing the static arc angle 6 is an N pole, and the two side walls of the U-shaped portion 101 of the second magnetizer 10 are S poles. In the arc motion chamber, there is a first magnetic field component parallel to the arc isolation wall plane and pointing to the direction of the static arc angle 6, a second magnetic field component perpendicular to the first arc isolation wall 11 and facing away from the second arc isolation wall 12, and a third magnetic field component perpendicular to the second arc isolation wall 12 and facing away from the first arc isolation wall 11. If the current direction of the DC arc is from the moving contact 2 to the stationary contact 5, the arc will be deflected toward the second arc isolation wall 12 under the action of the magnetic field force generated by the first magnetic field component, and then will move rapidly toward the arc extinguishing chamber 13 along the surface of the second arc isolation wall 12 under the action of the third magnetic field component; conversely, if the current direction of the DC arc is from the stationary contact 5 to the moving contact 2, the arc will be deflected toward the first arc isolation wall 11 under the action of the magnetic field force generated by the first magnetic field component, and then will move rapidly toward the arc extinguishing chamber 13 along the surface of the first arc isolation wall 11 under the action of the second magnetic field component.
[0044] See also Figure 4 and Figure 5 To further demonstrate the beneficial effects of the magnetically driven arc structure, it is assumed that only the second permanent magnet 9 and the second magnetic conductor 10 are used without adding the first permanent magnet 7 and the first magnetic conductor 8 as a match. The area between the static contact 5 and the second magnetic conductor 10 will produce a magnetic field component opposite to the second magnetic field component and the third magnetic field component. When the arc is biased toward one side of the arc isolation wall under the action of the first magnetic field component, the arc near the static contact 5 and the static arc angle 6 will be subject to the magnetic field force that suppresses the arc from moving toward the arc extinguishing chamber 13, which is not conducive to the arc moving quickly toward the arc extinguishing chamber 13. Figure 4 The figure shows the arc voltage waveform of 500V DC voltage, 2ms time constant and 63A current breaking under the condition that only the second permanent magnet 9 and the second magnetic conductor 10 are used without adding the first permanent magnet 7 and the first magnetic conductor 8. Figure 5 The figure shows the arc voltage waveform of 500V DC voltage, 2ms time constant, and 63A current interruption under the condition of using the second permanent magnet 9 and the second magnetic conductor 10, the first permanent magnet 7 and the first magnetic conductor 8 at the same time. It can be seen that Figure 4 Under the condition of arc voltage, there is a platform of about 200V in the early stage. The reason is that the arc movement is hindered. Figure 5 Under the conditions, the arc voltage did not pause, but rose rapidly to over 1300V until the arc was extinguished.
[0045] Example 3 A DC arc extinguishing system includes the magnetically driven arc structure of the above-mentioned embodiment 1 or embodiment 2.
[0046] Due to the magnetic field of the magnetically driven arc structure, the DC arc extinguishing system can quickly guide the arc to the predetermined arc extinguishing area, which helps to reduce the residence time of the arc inside the contact or equipment, thereby reducing damage to the equipment. While having higher arc extinguishing efficiency, it can significantly reduce the risk of contact damage due to arc erosion.
[0047] In summary, the present invention provides an optimized magnetically driven arc structure and a DC arc extinguishing system, which utilize the coordination of two magnetic conductors, two permanent magnets, and a dynamic arc angle and a static arc angle to generate a special three-dimensional magnetic field distribution in the arc movement chamber. For DC arcs in two directions, a magnetic field force driving the arc extinguishing chamber will be generated, causing the arc to move rapidly toward the arc extinguishing chamber 13. This rapid guiding mechanism helps to reduce the residence time of the arc in the contact or inside the equipment, thereby reducing damage to the equipment. The structure is simple, the cost is low, and it is easy to implement, and it is better suitable for the disconnection of high-voltage non-polarity DC power.
[0048] The above description is only a preferred embodiment of the present invention and is not intended to impose any limitation on the technical solution of the present invention. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can also be subjected to several simple modifications and substitutions, and these modifications and substitutions are also within the scope of protection covered by the claims.
Claims
1. A magnetically driven arc structure, characterized in that: The invention comprises an arc extinguishing chamber (13), wherein a static arc angle (6) is arranged on one side of the arc extinguishing chamber (13), wherein the static arc angle (6) is connected to a static conductive rod (4), and a static contact (5) is arranged on the static conductive rod (4); a dynamic arc angle (3) is arranged on the other side of the arc extinguishing chamber (13), wherein the dynamic arc angle (3) is sequentially connected to a dynamic contact (2) and a dynamic conductive rod (1); a first arc isolation wall (11) is arranged on one side of corresponding positions of the dynamic contact (2) and the static contact (5), and a second arc isolation wall (12) is arranged on the other side; the first arc isolation wall (11) and the second arc isolation wall (12) are arranged opposite to each other; A first magnetic conductor (8) and a first permanent magnet (7) are sequentially arranged at a position of the static conductive rod (4) on a side away from the moving arc angle (3) and relative to the static contact (5); A second permanent magnet (9) and a second magnetic conductor (10) are sequentially arranged on a side of the moving arc angle (3) away from the static arc angle (6); the polarity of the polar surface of the first permanent magnet (7) facing the moving arc angle (3) is opposite to the polarity of the polar surface of the second permanent magnet (9) facing the static arc angle (6).
2. The magnetic driven arc structure according to claim 1, characterized in that: The first magnetic conductor (8) is a U-shaped structure, and the opening of the U-shaped structure faces the static contact (5).
3. The magnetic driven arc structure according to claim 2, characterized in that: The end surface of the U-shaped structure of the first magnetic conductor (8) is higher than the static contact (5).
4. The magnetic driven arc structure according to claim 2, characterized in that: The opening width of the U-shaped structure of the first magnetic conductor (8) is greater than or equal to the width of the static contact (5).
5. The magnetic driven arc structure according to claim 1, characterized in that: The second magnetic conductor (10) comprises a U-shaped portion (101), two walls of the U-shaped portion (101) are respectively connected to connecting arms (102), and the connecting arms (102) are connected to arc-shaped walls (103).
6. The magnetic driven arc structure according to claim 5, characterized in that: The arc-shaped wall (103) extends from the area between the moving contact (2) and the stationary contact (5) to the edge of the arc extinguishing chamber (13).
7. The magnetic driven arc structure according to claim 5, characterized in that: The two walls of the U-shaped portion (101), the connecting arm (102) and the arc-shaped wall (103) are all located outside the first arc isolation wall (11) and the second arc isolation wall (12).
8. The magnetic driven arc structure according to claim 1, characterized in that: The first magnetic conductor (8) and the second magnetic conductor (10) are made of ferromagnetic material.
9. The magnetic driven arc structure according to claim 1, characterized in that: There is a gap between the first magnetic conductor (8) and the second magnetic conductor (10), or they are separated by insulating material.
10. A DC arc extinguishing system, characterized in that: It comprises the magnetically driven arc structure as described in any one of claims 1-9.