Arc path forming portion and DC relay including the same

Abstract

The invention discloses an arc path forming portion and a DC relay including the arc path forming portion. The arc path forming portion and the DC relay including the arc path forming portion, which can effectively guide a generated arc to the outside, include: a magnet frame; and a Halbach array disposed adjacent to an inner circumferential surface of the magnet frame so as to form a magnetic field inside the magnet frame, the Halbach array including a first magnet block, a second magnet block, and a third magnet block disposed aligned in one direction, the surface of the first magnet facing the third magnet is magnetized to a polarity opposite to the polarity of the surface of the third magnet facing the first magnet.

Description

TECHNICAL FIELD

[0001] The present application relates to an arc path forming portion and a direct current relay including the same, and more particularly, to an arc path forming portion capable of efficiently guiding an arc generated to the outside and a direct current relay including the same. BACKGROUND

[0002] A direct current relay refers to a device that transmits a mechanical driving or current signal using an electromagnet principle. The direct current relay is also called a magnetic switch, and is generally classified as a circuit switching device.

[0003] The direct current relay includes a fixed contact and a movable contact. The fixed contact is connected to an external power source and a load in a manner that can be energized. The fixed contact and the movable contact can be in contact with or separated from each other.

[0004] The energization through the direct current relay is allowed or blocked according to the contact and separation of the fixed contact and the movable contact. The movement is achieved by a driving portion that applies a driving force to the movable contact.

[0005] When the fixed contact and the movable contact are separated, an arc is generated between the fixed contact and the movable contact. The arc is a flow of a high-voltage, high-temperature current. Therefore, it is necessary to quickly discharge the generated arc from the direct current relay through a predetermined path.

[0006] The discharge path of the arc is formed by a magnet provided in the direct current relay. The magnet forms a magnetic field inside a space in which the fixed contact and the movable contact come into contact. The discharge path of the arc is formed by an electromagnetic force generated due to the formed magnetic field and the flow of the current.

[0007] However, when the generated arc cannot be moved to the outside in time or is not sufficiently arc-extinguished until it is moved to the outside, there is a possibility that internal components of the direct current relay are damaged by the energy of the arc.

[0008] In addition, since a shaft and a spring member or the like for driving the movable contact in the up-and-down direction are provided at a central portion (i.e., a space between the fixed contacts different from each other) of the direct current relay, when the generated arc moves to the central portion, these members can be damaged.

[0009] Therefore, there is a need to develop an arc path forming portion capable of quickly discharging a generated arc to the outside and a direct current relay including the same capable of quickly arc-extinguishing the generated arc.

[0010] Korean Patent Publication No. 10-1216824 discloses a DC relay. Specifically, a DC relay capable of preventing arbitrary separation between a fixed contact and a movable contact using a decay magnet is disclosed.

[0011] However, such a DC relay does not disclose a structure for forming an exhaust path of an arc generated when the fixed contact and the movable contact are separated.

[0012] Korean Patent Publication No. 10-1696952 discloses a DC relay. Specifically, a DC relay capable of preventing movement of a movable contact using a plurality of permanent magnets is disclosed.

[0013] However, such a DC relay does not disclose a structure for controlling the direction of an exhaust path of an arc.

[0014] Korean Patent Publication No. 10-1696952 (December 28, 2012).

[0015] Korean Patent Publication No. 10-1696952 (January 16, 2017). SUMMARY

[0016] PROBLEMS TO BE SOLVED BY THE INVENTION

[0017] An object of the present invention is to provide an arc path forming portion capable of effectively arc extinguishing and exhausting an arc generated and a DC relay including the arc path forming portion.

[0018] Another object of the present invention is to provide an arc path forming portion capable of preventing damage to various constituent elements disposed near a center portion for DC relay operation and a DC relay including the arc path forming portion.

[0019] Still another object of the present invention is to provide an arc path forming portion capable of more precisely adjusting the direction and strength of a magnetic field for exhausting an arc and a DC relay including the arc path forming portion.

[0020] However, the problems to be solved by the present disclosure are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art to which the present disclosure pertains from the following description.

[0021] MEANS FOR SOLVING THE PROBLEMS

[0022] To achieve the object, an arc path forming portion according to an embodiment of the present application includes a magnet frame in which a space portion in which a fixed contact and a movable contact are accommodated is formed, and a Halbach array including a plurality of magnetic blocks formed of a magnetic substance, the plurality of magnetic blocks being arranged adjacent to an inner peripheral surface of the magnet frame in a space portion, being arranged in alignment in one direction, the Halbach array including a first magnetic block, a second magnetic block arranged in overlap with the first magnetic block in the one direction, and a third magnetic block arranged opposite to the first magnetic block with the second magnetic block interposed therebetween, a surface of the first magnetic block facing the third magnetic block being magnetized to a polarity opposite to a polarity of a surface of the third magnetic block facing the first magnetic block.

[0023] In addition, the Halbach array includes a first Halbach array arranged adjacent to one surface of the magnet frame, and a second Halbach array arranged adjacent to the other surface of the magnet frame, the first and second Halbach arrays being arranged opposite to each other with the fixed contact and the movable contact interposed therebetween, each of the first and second Halbach arrays can be provided with the first magnetic block, the second magnetic block, and the third magnetic block.

[0024] In addition, the space portion is formed to have a length in the one direction smaller than a length in another direction, the first magnetic block, the second magnetic block, and the third magnetic block provided in the first Halbach array are arranged in overlap with the first magnetic block, the second magnetic block, and the third magnetic block provided in the second Halbach array in the other direction, respectively, and a surface of the first magnetic block provided in the first Halbach array facing the second magnetic block can be magnetized to a polarity identical to a polarity of a surface of the first magnetic block provided in the second Halbach array facing the second magnetic block.

[0025] In addition, a surface of the second magnetic block provided in the first Halbach array and a surface of the second magnetic block provided in the second Halbach array facing the fixed contact and the movable contact can be magnetized to polarities opposite to each other.

[0026] In addition, a surface of the second magnetic block provided in the first Halbach array and a surface of the second magnetic block provided in the second Halbach array facing the fixed contact and the movable contact can be magnetized to polarities opposite to each other.

[0027] In addition, the magnet frame includes a spacer disposed on an inner circumferential surface of the magnet frame and between two magnetic blocks of the Halbach array that are adjacent to each other, the spacer being convexly formed in a direction away from the inner circumferential surface of the magnet frame, and a thickness of the spacer in the one direction being formed to correspond to a spacing between the two magnetic blocks that are adjacent to each other, two spacers that are different from each other being provided, the two spacers that are different from each other being disposed opposite to each other with one magnetic block of the Halbach array interposed therebetween, and a spacing between the two spacers that are different from each other being configured to correspond to a length of the one magnetic block in the one direction.

[0028] At least one of the first magnetic block, the second magnetic block, and the third magnetic block extends in a direction intersecting the one direction.

[0029] In addition, the present application provides a DC relay including a plurality of fixed contacts disposed apart from each other, a movable contact that contacts or separates from the fixed contacts, a magnet frame in which a space portion in which the fixed contacts and the movable contact are accommodated is formed inside, and a Halbach array including a plurality of magnetic blocks formed of a magnetic body, the plurality of magnetic blocks forming a magnetic field in the space portion, being disposed adjacent to an inner circumferential surface of the magnet frame, and being disposed in alignment in one direction, the Halbach array including a first magnetic block, a second magnetic block disposed in overlap with the first magnetic block in the one direction, and a third magnetic block disposed opposite to the first magnetic block with the second magnetic block interposed therebetween, a surface of the first magnetic block facing the third magnetic block being magnetized to a polarity opposite to a polarity of a surface of the third magnetic block facing the first magnetic block.

[0030] In addition, the Halbach array includes a first Halbach array disposed adjacent to one surface of the magnet frame, and a second Halbach array disposed adjacent to the other surface of the magnet frame, the first Halbach array and the second Halbach array being disposed opposite to each other with the fixed contacts and the movable contact interposed therebetween, each of the first Halbach array and the second Halbach array being provided with the first magnetic block, the second magnetic block, and the third magnetic block.

[0031] In addition, the space portion is formed to have a length in the one direction smaller than a length in another direction, the first magnetic block, the second magnetic block, and the third magnetic block provided in the first Halbach array are disposed in overlap with the first magnetic block, the second magnetic block, and the third magnetic block provided in the second Halbach array in the other direction, respectively, and a surface of the first magnetic block provided in the first Halbach array facing the second magnetic block can be magnetized to a polarity identical to a polarity of a surface of the first magnetic block provided in the second Halbach array facing the second magnetic block.

[0032] In addition, the magnet frame includes a spacer disposed on an inner circumferential surface of the magnet frame and between two magnetic blocks of the Halbach array that are adjacent to each other, the spacer being convexly formed in a direction away from the inner circumferential surface of the magnet frame, and a thickness of the spacer in the one direction being formed to correspond to a spacing between the two magnetic blocks that are adjacent to each other, two spacers that are different from each other being provided, the two spacers that are different from each other being disposed opposite to each other with one magnetic block of the Halbach array interposed therebetween, and a spacing between the two spacers that are different from each other being configured to correspond to a length of the one magnetic block in the one direction.

[0033] In addition, at least one of the first magnetic block, the second magnetic block, and the third magnetic block can extend in a direction intersecting the one direction.

[0034] Effects of Invention

[0035] Among various effects of the present invention, effects obtainable by the above-described solution means are as follows.

[0036] First, the arc path forming portion according to the present invention includes a magnet frame and a Halbach array. The Halbach array is configured by a plurality of magnetic bodies aligned in a one direction. Specifically, the Halbach array includes a first magnetic block, a second magnetic block disposed in the one direction so as to overlap the first magnetic block, and a third magnetic block disposed opposite to the first magnetic block with the second magnetic block interposed therebetween. At this time, a face of the first magnetic block facing the third magnetic block is magnetized to a polarity opposite to a polarity of a face of the third magnetic block facing the first magnetic block.

[0037] Accordingly, the arc generated in the arc chamber can be guided to an edge of the magnet frame (i.e., an edge of the arc chamber). Therefore, the total length of the arc discharge path can be further increased. That is, the generated arc can be effectively arc-extinguished and discharged.

[0038] In addition, the Halbach array includes a first Halbach array disposed adjacent to one face of the magnet frame, and a second Halbach array disposed adjacent to the other face of the magnet frame, the second Halbach array being disposed opposite to the first Halbach array with the fixed contact and the movable contact interposed therebetween. At this time, the first Halbach array and the second Halbach array form a magnetic field in a direction away from the fixed contact and the movable contact.

[0039] Accordingly, the generated arc can move in a direction away from the fixed contact and the movable contact and be arc-extinguished. Therefore, not only the fixed contact and the movable contact can be prevented from being damaged, but also various constituent elements disposed in the vicinity of the center portion for the operation of the DC relay can be prevented from being damaged.

[0040] In addition, the magnet frame can include a spacer physically separating two magnetic blocks adjacent to each other of the Halbach array. At this time, the interval between the two magnetic blocks can be adjusted by the thickness and position of the spacer, etc.

[0041] Accordingly, the direction and strength of the magnetic field formed by the Halbach array can be adjusted more finely.

[0042] Effects of the present application are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a perspective view showing a DC relay according to an embodiment of the present application.

[0044] Figure 2 is a front cross-sectional view showing the DC relay of Figure 1 .

[0045] Figure 3 is a perspective view showing a fixed contact, a movable contact, and an arc path forming portion of the DC relay provided in Figure 1 .

[0046] Figure 4 is a perspective view showing the arc path forming portion of the DC relay provided in Figure 1 .

[0047] Figures 5 to 6 is a plan view showing the arc path forming portion of Figure 4 .

[0048] Figure 7 is an exploded perspective view showing the arc path forming portion of Figure 4 .

[0049] Figure 8 is a top cross-sectional view showing a first magnet frame of the arc path forming portion provided in Figure 4 .

[0050] Figure 9 is a conceptual view showing a magnetic field and a path of an arc formed by the arc path forming portion according to an embodiment of the present application.

[0051] Figure 10 is a conceptual view showing a magnetic field and a path of an arc formed by the arc path forming portion according to another embodiment of the present application. DETAILED DESCRIPTION

[0052] Hereinafter, the arc path forming portion 100 and the DC relay 1 according to an embodiment of the present application will be described in detail with reference to the accompanying drawings.

[0053] In the following description, the explanation of some of the components is omitted in order to make the features of the present application clear.

[0054] In the present specification, the same reference numerals are given to the same components in different embodiments, and the repeated explanation thereof is omitted.

[0055] The accompanying drawings are for facilitating the understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings.

[0056] 1. Definition of terms

[0057] Unless otherwise explicitly stated in the context, the singular form of expression includes the plural form of expression.

[0058] The term "magnetize" used in the following description means the phenomenon that a certain object exhibits magnetism in a magnetic field.

[0059] The term "polarity" used in the following description means the property of an electrode that is different from each other such as anode and cathode. In an embodiment, the polarity can be distinguished as N-pole or S-pole.

[0060] The term "electric current" used in the following description means the state in which two or more components are electrically connected.

[0061] The term "arc path" used in the following description means the path in which the generated arc moves or is moved and is extinguished.

[0062] The term "Halbach Array" used in the following description means the assembly in which a plurality of magnetic bodies are arranged in parallel and constitute a column or a row.

[0063] The plurality of magnetic bodies constituting the Halbach Array can be arranged according to a predetermined rule. The plurality of magnetic bodies can form a magnetic field individually or between each other.

[0064] The Halbach Array includes two relatively long faces and the remaining two relatively short faces. The magnetic field formed by the magnetic bodies constituting the Halbach Array can be formed at the outside of any one of the two relatively long faces with a stronger intensity.

[0065] In the following description, it is assumed that the magnetic field intensity in the magnetic field formed by the Halbach Array is stronger in the direction toward the center of the arc path forming portion 100.

[0066] The terms "upper side", "lower side", "left side", "right side", "front side" and "rear side" used in the following description can be understood with reference to the coordinate system shown in Figures 1 to 3 and Figures 5 to 8

[0067] 2. Explanation of the configuration of the DC relay 1 according to the embodiment of the present application

[0068] Hereinafter, the DC relay 1 according to the embodiment of the present application will be explained with reference to Figures 1 to 3

[0069] In the illustrated embodiment, the DC relay 1 includes a frame portion 10, an opening and closing portion 20, a core portion 30, a movable contact portion 40, and an arc path forming portion 100.

[0070] Hereinafter, each configuration of the DC relay 1 according to the embodiment of the present application will be explained with reference to the drawings, and the arc path forming portion 100 will be explained separately.

[0071] (1) Explanation of the frame portion 10

[0072] The frame portion 10 forms the outside of the DC relay 1. A predetermined space is formed inside the frame portion 10. Various devices that perform a function for causing the DC relay 1 to apply or block an electric current transmitted from the outside can be accommodated in the space. That is, the frame portion 10 functions as a kind of housing 41.

[0073] The frame portion 10 can be made of an insulating material such as synthetic resin. This is to prevent any electric conduction between the inside and the outside of the frame portion 10.

[0074] In the illustrated embodiment, the frame portion 10 includes an upper frame 11, a lower frame 12, an insulating plate 13, and a support plate 14.

[0075] The upper frame 11 forms the upper side of the frame portion 10. A predetermined space is formed inside the upper frame 11.

[0076] The opening and closing portion 20 and the movable contact portion 40 can be accommodated in the inside space of the upper frame 11. In addition, the arc path forming portion 100 can be accommodated in the inside space of the upper frame 11.

[0077] The upper frame 11 can be combined with the lower frame 12. The space between the upper frame 11 and the lower frame 12 can be provided with the insulating plate 13 and the support plate 14.

[0078] ​​The fixed contact 22 of the opening and closing portion 20 is located at one side (the upper side in the illustrated embodiment) of the upper frame 11. A part of the fixed contact 22 is exposed at the upper side of the upper frame 11, and can be connected to an external power source or load in a manner that allows electric conduction. To this end, the upper side of the upper frame 11 can be formed with a through-hole through which the fixed contact 22 is combined.

[0079] The lower frame 12 forms the lower side of the frame portion 10. The inside of the lower frame 12 is formed with a predetermined space. The inside space of the lower frame 12 can accommodate the core portion 30.

[0080] The lower frame 12 can be combined with the upper frame 11. The space between the lower frame 12 and the upper frame 11 can be provided with the insulating plate 13 and the support plate 14.

[0081] The insulating plate 13 and the support plate 14 electrically and physically separate the inside space of the upper frame 11 and the inside space of the lower frame 12.

[0082] The insulating plate 13 is provided between the upper frame 11 and the lower frame 12. The insulating plate 13 electrically separates the upper frame 11 and the lower frame 12. To this end, the insulating plate 13 can be made of an insulating material such as synthetic resin.

[0083] Through the insulating plate 13, any electric conduction between the opening and closing portion 20, the movable contact portion 40, and the arc path forming portion 100 accommodated in the inside of the upper frame 11 and the core portion 30 accommodated in the inside of the lower frame 12 can be prevented.

[0084] The center portion of the insulating plate 13 is formed with a through-hole (not shown). The shaft 44 of the movable contact portion 40 is combined with the through-hole (not shown) in a manner that allows movement in the vertical direction.

[0085] The lower side of the insulating plate 13 is provided with the support plate 14. The insulating plate 13 can be supported by the support plate 14.

[0086] The support plate 14 is provided between the upper frame 11 and the lower frame 12.

[0087] The support plate 14 physically separates the upper frame 11 and the lower frame 12. In addition, the support plate 14 supports the insulating plate 13.

[0088] The support plate 14 can be made of a magnetic body. Accordingly, the support plate 14 can collectively form a magnetic circuit with the magnetic yoke 33 of the core portion 30. Through the magnetic circuit, a driving force for moving the movable core 32 of the core portion 30 toward the fixed core 31 can be formed.

[0089] A through-hole (not shown) is formed in the center portion of the support plate 14. The shaft 44 is coupled to the through-hole (not shown) in a manner that is movable in the up-and-down direction. Thus, when the movable core 32 moves in the direction of the fixed core 31 or moves away from the direction of the fixed core 31, the shaft 44 and the movable contact 43 coupled to the shaft 44 can also move in the same direction.

[0090] (2) Explanation of the opening and closing portion 20

[0091] The opening and closing portion 20 allows or blocks the passage of current according to the operation of the core portion 30. Specifically, the opening and closing portion 20 can allow or block the passage of current according to the contact or separation of the fixed contact 22 and the movable contact 43.

[0092] The opening and closing portion 20 is accommodated in the internal space of the upper frame 11. The opening and closing portion 20 can be electrically and physically separated from the core portion 30 by the insulating plate 13 and the support plate 14.

[0093] In the illustrated embodiment, the opening and closing portion 20 includes an arc chamber 21, a fixed contact 22, and a sealing member 23.

[0094] In addition, the outer side of the arc chamber 21 can be provided with an arc path forming portion 100. The arc path forming portion 100 can form a magnetic field inside the arc chamber 21 for forming a path for the generated arc. A detailed explanation thereof will be described later.

[0095] The arc chamber 21 can extinguish the arc generated due to the separation of the fixed contact 22 and the movable contact 43 in the internal space. Therefore, the arc chamber 21 can also be referred to as an "arc extinguishing portion".

[0096] The arc chamber 21 sealingly accommodates the fixed contact 22 and the movable contact 43. That is, the fixed contact 22 and the movable contact 43 are accommodated inside the arc chamber 21. Therefore, it is possible to prevent the arc generated due to the separation of the fixed contact 22 and the movable contact 43 from flowing out to the outside.

[0097] The inside of the arc chamber 21 can be filled with an arc-extinguishing gas. The arc-extinguishing gas can cause the generated arc to be extinguished and discharged to the outside of the DC relay 1 through a predetermined path. For this purpose, a communication hole (not shown) can be formed through the wall that surrounds the internal space of the arc chamber 21.

[0098] The arc chamber 21 can be made of an insulating material. In addition, the arc chamber 21 can be made of a material having high voltage resistance and high heat resistance. This is because the generated arc is an electron flow of high temperature and high pressure. In an embodiment, the arc chamber 21 can be made of a ceramic material.

[0099] The upper side of the arc chamber 21 can be formed with a plurality of through-holes. The fixed contact 22 is respectively through-bonding combined in the through-holes.

[0100] In the illustrated embodiment, the fixed contact 22 is provided with two fixed contacts, i.e., a first fixed contact 22a and a second fixed contact 22b. Therefore, two through-holes formed in the upper side of the arc chamber 21 can also be formed.

[0101] When the fixed contact 22 is through-bonding combined in the through-holes, the through-holes are sealed. That is, the fixed contact 22 is sealingly combined in the through-holes. Therefore, the generated arc cannot be discharged to the outside through the through-holes.

[0102] The lower side of the arc chamber 21 can be open. The insulating plate 13 and the sealing member 23 are in contact with the lower side of the arc chamber 21. That is, the lower side of the arc chamber 21 is sealed by the insulating plate 13 and the sealing member 23. Therefore, the arc chamber 21 can be electrically and physically separated from the outside of the upper frame 11.

[0103] The arc quenched in the arc chamber 21 allows or blocks the energization of the inside of the DC relay 1 to the outside through a predetermined path. In an embodiment, the quenched arc can be discharged to the outside of the arc chamber 21 through the communication hole (not shown).

[0104] The fixed contact 22 is in contact with or separated from the movable contact 43 to allow or block the energization of the inside of the DC relay 1 to the outside.

[0105] Specifically, when the fixed contact 22 is in contact with the movable contact 43, the inside of the DC relay 1 can be energized to the outside. In contrast, when the fixed contact 22 is separated from the movable contact 43, the energization of the inside of the DC relay 1 to the outside is blocked.

[0106] As the name implies, the fixed contact 22 does not move. That is, the fixed contact 22 is fixedly combined to the upper frame 11 and the arc chamber 21. Therefore, the contact and separation of the fixed contact 22 from the movable contact 43 are achieved by the movement of the movable contact 43.

[0107] One side end (the upper side end in the illustrated embodiment) of the fixed contact 22 is exposed to the outside of the upper frame 11. The power source or the load is respectively connected to the one side end in a manner capable of being energized.

[0108] A plurality of fixed contacts 22 can be provided. In the illustrated embodiment, the fixed contact 22 is provided with two fixed contacts, i.e., a first fixed contact 22a on the left side and a second fixed contact 22b on the right side.

[0109] The first fixed contact 22a is disposed obliquely to one side (left side in the illustrated embodiment) from the center in the length direction of the movable contact 43. In addition, the second fixed contact 22b is disposed obliquely to the other side (right side in the illustrated embodiment) from the center in the length direction of the movable contact 43.

[0110] The power source can be connected in a manner capable of being energized to either one of the first fixed contact 22a and the second fixed contact 22b. In addition, the load can be connected in a manner capable of being energized to the other one of the first fixed contact 22a and the second fixed contact 22b.

[0111] The DC relay 1 according to the embodiment of the present application can form a path of an arc regardless of the direction of the power source or the load connected to the fixed contact 22. This is achieved by the arc path forming portion 100, and a detailed explanation thereof will be given later.

[0112] The other side end portion (lower side end portion in the illustrated embodiment) of the fixed contact 22 extends toward the movable contact 43.

[0113] When the movable contact 43 moves in the direction toward the fixed contact 22 (upper side in the illustrated embodiment), the lower side end portion comes into contact with the movable contact 43. Thus, the outside and the inside of the DC relay 1 can be energized.

[0114] The lower side end portion of the fixed contact 22 is disposed inside the arc chamber 21.

[0115] When the control power source is blocked, the movable contact 43 is separated from the fixed contact 22 by the elastic force of the return spring 36. At this time, as the fixed contact 22 is separated from the movable contact 43, an arc is generated between the fixed contact 22 and the movable contact 43. The generated arc is extinguished by the arc-extinguishing gas inside the arc chamber 21 and is discharged to the outside along the path formed by the arc path forming portion 100.

[0116] The sealing member 23 blocks any communication between the arc chamber 21 and the inside space of the upper frame 11. The sealing member 23 seals the lower side of the arc chamber 21 together with the insulating plate 13 and the support plate 14.

[0117] Specifically, the upper side of the sealing member 23 is joined to the lower side of the arc chamber 21. In addition, the radially inner side of the sealing member 23 is joined to the outer periphery of the insulating plate 13, and the lower side of the sealing member 23 is joined to the support plate 14.

[0118] Thus, the arc generated in the arc chamber 21 and the arc extinguished by the arc-extinguishing gas do not flow into the inside space of the upper frame 11 at will.

[0119] In addition, the sealing member 23 can be configured to block any communication between the inside space of the cylinder 37 and the inside space of the frame portion 10.

[0120] (3) Description of the core 30

[0121] The core 30 moves the movable contact part 40 upward as the control power is applied. When the control power is released, the core 30 moves the movable contact part 40 downward again.

[0122] The core portion 30 is electrically connected to an external control power source (not shown) so as to be able to receive the control power source.

[0123] The core 30 is provided on the lower side of the opening and closing portion 20. The core 30 is housed inside the lower frame 12. The core 30 and the opening and closing portion 20 can be electrically and physically separated by the insulating plate 13 and the support plate 14.

[0124] A movable contact portion 40 is provided between the core portion 30 and the switch portion 20. The movable contact portion 40 can be moved by a driving force applied by the core portion 30. Thus, the movable contact 43 contacts the fixed contact 22, and the DC relay 1 is energized.

[0125] The core portion 30 includes a fixed core 31 , a movable core 32 , a yoke 33 , a bobbin 34 , a coil 35 , a return spring 36 , and a cylinder 37 .

[0126] The fixed core 31 is magnetized by the magnetic field generated by the coil 35 to generate electromagnetic attraction. By the electromagnetic attraction, the movable core 32 moves toward the fixed core 31 ( Figure 2 the upper direction in the middle).

[0127] The fixed core 31 does not move. That is, the fixed core 31 is fixedly coupled to the support plate 14 and the cylinder 37 .

[0128] The fixed core 31 may have any shape that can be magnetized by a magnetic field to generate electromagnetic force. In one embodiment, the fixed core 31 may be a permanent magnet or an electromagnet.

[0129] A portion of the stationary core 31 is accommodated in the upper space inside the cylinder 37 . The outer periphery of the stationary core 31 is in contact with the inner periphery of the cylinder 37 .

[0130] The fixed core 31 is provided between the support plate 14 and the movable core 32 .

[0131] A through hole (not shown) is formed in the center of the fixed core 31. The shaft 44 is coupled to the through hole so as to be movable up and down.

[0132] The fixed core 31 is disposed at a predetermined distance from the movable core 32. Therefore, the distance by which the movable core 32 can move toward the fixed core 31 can be limited to the predetermined distance. Therefore, the predetermined distance can be defined as the "moving distance of the movable core 32".

[0133] The one end portion (upper end portion in the illustrated embodiment) of the return spring 36 contacts the lower side of the fixed core 31. When the fixed core 31 is magnetized so that the movable core 32 moves upward, the return spring 36 is compressed and stores a restoring force.

[0134] Therefore, when the application of the control power is released so that the magnetization of the fixed core 31 is terminated, the movable core 32 can return to the lower side by means of the restoring force.

[0135] When the control power is applied, the movable core 32 moves toward the fixed core 31 due to the electromagnetic attraction generated by the fixed core 31.

[0136] With the movement of the movable core 32, the shaft 44 coupled to the movable core 32 moves in the direction toward the fixed core 31 (the upper side in the illustrated embodiment). In addition, with the movement of the shaft 44, the movable contact portion 40 coupled to the shaft 44 moves upward. Therefore, the fixed contact 22 comes into contact with the movable contact 43, so that the direct current relay 1 can be energized with an external power source or load.

[0137] The movable core 32 can be provided in any form capable of being attracted by electromagnetic force. In one embodiment, the movable core 32 is made of a magnetic material and can be provided as a permanent magnet or an electromagnet, etc.

[0138] The movable core 32 is accommodated inside the cylinder 37. In addition, the movable core 32 can move in the length direction of the cylinder 37 (the up-down direction in the illustrated embodiment) inside the cylinder 37. Specifically, the movable core 32 can move in the direction toward the fixed core 31 and the direction away from the fixed core 31.

[0139] The movable core 32 is coupled to the shaft 44. The movable core 32 can move integrally with the shaft 44. When the movable core 32 moves upward or downward, the shaft 44 also moves upward or downward. Therefore, the movable contact 43 also moves upward or downward.

[0140] The movable core 32 is disposed on the lower side of the fixed core 31. The movable core 32 is separated from the fixed core 31 by a predetermined distance. As described above, the predetermined distance is the distance by which the movable core 32 can move in the up-down direction.

[0141] The movable core 32 is formed to extend in the length direction. A hollow portion recessed by a predetermined depth is formed inside the movable core 32 along the length direction. The hollow portion accommodates the return spring 36 and a portion of the shaft 44 coupled to the lower side of the return spring 36.

[0142] The through hole is formed through the lower side of the hollow portion in the length direction. The hollow portion communicates with the through hole. The lower end portion of the shaft 44 inserted into the hollow portion can be moved toward the through hole.

[0143] The space portion can be formed in the lower end portion of the movable core 32 to be recessed by a predetermined depth. The space portion communicates with the through hole. The lower head portion of the shaft 44 is provided in the space portion.

[0144] The magnetic yoke 33 forms a magnetic circuit as the control power is applied. The magnetic circuit formed by the magnetic yoke 33 can be configured to adjust the direction of the magnetic field formed by the coil 35.

[0145] Therefore, the coil 35 can generate a magnetic field in the direction in which the movable core 32 moves toward the fixed core 31 when the control power is applied. The magnetic yoke 33 can be made of an electrically conductive material that can be energized.

[0146] The magnetic yoke 33 is accommodated inside the lower frame 12. The magnetic yoke 33 surrounds the coil 35. The coil 35 can be accommodated inside the magnetic yoke 33 to be spaced apart from the inner circumferential surface of the magnetic yoke 33 by a predetermined distance.

[0147] The magnetic yoke 33 accommodates the bobbin 34 therein. That is, the magnetic yoke 33, the coil 35, and the bobbin 34 on which the coil 35 is wound are sequentially disposed in the direction from the outer circumference of the lower frame 12 to the radially inner side.

[0148] The upper side of the magnetic yoke 33 is in contact with the support plate 14. In addition, the outer circumference of the magnetic yoke 33 can be provided to be in contact with the inner circumference of the lower frame 12 or to be spaced apart from the inner circumference of the lower frame 12 by a predetermined distance.

[0149] The bobbin 34 has the coil 35 wound thereon. The bobbin 34 is accommodated inside the magnetic yoke 33.

[0150] The bobbin 34 can include a flat upper portion and a lower portion and a cylindrical column portion extending in the length direction to connect the upper portion and the lower portion. That is, the bobbin 34 is in the shape of a bob.

[0151] The upper portion of the bobbin 34 is in contact with the lower side of the support plate 14. The coil 35 is wound on the column portion of the bobbin 34. The thickness at which the coil 35 is wound can be provided to be less than or equal to the diameters of the upper portion and the lower portion of the bobbin 34.

[0152] A hollow portion extending in the length direction is formed through the column portion of the bobbin 34. The cylinder 37 can be accommodated in the hollow portion. The column portion of the bobbin 34 can be configured to have the fixed core 31, the movable core 32, and a central shaft such as the shaft 44.

[0153] The coil 35 generates a magnetic field by an applied control power. The fixed core 31 is magnetized by the magnetic field generated by the coil 35, and can apply an electromagnetic attraction to the movable core 32.

[0154] The coil 35 is wound around the bobbin 34. Specifically, the coil 35 is wound around a column portion of the bobbin 34 to be stacked in a radial direction of the column portion. The coil 35 is accommodated in the inside of the yoke 33.

[0155] When the control power is applied, the coil 35 generates a magnetic field. At this time, the strength or direction of the magnetic field generated by the coil 35 can be controlled by the yoke 33. The fixed core 31 is magnetized by the magnetic field generated by the coil 35.

[0156] When the fixed core 31 is magnetized, the movable core 32 will be subjected to an electromagnetic force (i.e., an attractive force) in a direction toward the fixed core 31. Therefore, the movable core 32 moves in a direction toward the fixed core 31 (an upper side in the illustrated embodiment).

[0157] After the movable core 32 moves toward the fixed core 31, when the application of the control power is released, the return spring 36 provides a restoring force for returning the movable core 32 to the initial position.

[0158] As the movable core 32 moves toward the fixed core 31, the return spring 36 is compressed and stores a restoring force. At this time, the stored restoring force is preferably smaller than the electromagnetic attractive force that the fixed core 31 applies to the movable core 32 due to being magnetized. This is to prevent the movable core 32 from being arbitrarily returned to the initial position by the return spring 36 during the application of the control power.

[0159] When the application of the control power is released, the movable core 32 is subjected to the restoring force of the return spring 36. Of course, a gravitational force due to the empty weight of the movable core 32 can also act on the movable core 32. Therefore, the movable core 32 moves in a direction away from the fixed core 31, and can return to the original position.

[0160] The return spring 36 can have any form capable of storing a restoring force when a shape is changed, and transmitting the restoring force to the outside when returning to the initial shape. In one embodiment, the return spring 36 can be provided as a coil spring.

[0161] The shaft 44 is coupled through the return spring 36. The shaft 44 can move in the up-and-down direction regardless of the change in the shape of the return spring 36 in the state of being coupled to the return spring 36.

[0162] The return spring 36 is accommodated in a hollow portion recessed on the upper side of the movable core 32. In addition, one end portion (the upper end portion in the illustrated embodiment) of the return spring 36 toward the fixed core 31 is accommodated in a hollow portion recessed on the lower side of the fixed core 31.

[0163] The cylinder 37 accommodates the fixed core 31, the movable core 32, the return spring 36, and the shaft 44. The movable core 32 and the shaft 44 are movable in the cylinder 37 in the upward and downward directions.

[0164] The cylinder 37 is provided in a hollow portion formed in the column portion of the bobbin 34 . The upper end portion of the cylinder 37 is in contact with the lower surface of the support plate 14 .

[0165] The side surface of the cylinder 37 contacts the inner peripheral surface of the column portion of the bobbin 34. The upper opening of the cylinder 37 may be sealed by the fixed core 31. The lower surface of the cylinder 37 may contact the inner surface of the lower frame 12.

[0166] (4) Description of the movable contact portion 40

[0167] The movable contact part 40 includes a movable contact 43 and a structure for moving the movable contact 43. The DC relay 1 can be energized with an external power source or load via the movable contact part 40.

[0168] The movable contact part 40 is accommodated in the internal space of the upper frame 11. In addition, the movable contact part 40 is accommodated in the interior of the arc chamber 21 so as to be movable up and down.

[0169] The fixed contact 22 is provided on the upper side of the movable contact part 40. The movable contact part 40 is accommodated inside the arc chamber 21 so as to be movable in a direction toward the fixed contact 22 and a direction away from the fixed contact 22.

[0170] The core portion 30 is provided on the lower side of the movable contact portion 40. The movement of the movable contact portion 40 can be achieved by the movement of the movable core 32.

[0171] The movable contact part 40 includes a housing 41 , a cover 42 , a movable contact 43 , a shaft 44 , and an elastic part 45 .

[0172] The housing 41 accommodates the movable contact 43 and the elastic portion 45 that elastically supports the movable contact 43 .

[0173] In the illustrated embodiment, one side of the housing 41 and the other side opposite to the one side are open, and the movable contact 43 can be inserted through the open portion.

[0174] The unopened side surface of the housing 41 may be configured to surround the accommodated movable contact 43 .

[0175] A cover 42 is provided on the upper side of the housing 41 . The cover 42 covers the upper surface of the movable contact 43 accommodated in the housing 41 .

[0176] The housing 41 and the cover 42 are preferably made of an insulating material to prevent accidental energization. In one embodiment, the housing 41 and the cover 42 can be made of synthetic resin or the like.

[0177] The lower side of the housing 41 is connected to the shaft 44. When the movable core 32 connected to the shaft 44 is moved upward or downward, the housing 41 and the movable contact 43 housed in the housing 41 can also be moved upward or downward.

[0178] The housing 41 and the cover 42 can be combined by any member. In one embodiment, the housing 41 and the cover 42 can be combined by a fastening member (not shown) such as a bolt, a nut or the like.

[0179] With the application of the control power source, the movable contact 43 comes into contact with the fixed contact 22, and the DC relay 1 can be energized with the external power source and the load. In addition, when the application of the control power source is released, the movable contact 43 is separated from the fixed contact 22, and the DC relay 1 is not energized with the external power source and the load.

[0180] The movable contact 43 is disposed adjacent to the fixed contact 22.

[0181] A portion of the upper side of the movable contact 43 is covered by the cover 42. In one embodiment, a portion of the upper side surface of the movable contact 43 can be in contact with the lower side surface of the cover 42.

[0182] The lower side of the movable contact 43 is elastically supported by the elastic portion 45. To prevent any movement of the movable contact 43 downward, the elastic portion 45 can elastically support the movable contact 43 in a state of being compressed by a predetermined distance.

[0183] The movable contact 43 can be formed so as to extend in the length direction (left-right direction in the illustrated embodiment). That is, the length of the movable contact 43 is formed to be longer than the width. Therefore, both side end portions of the movable contact 43 housed in the housing 41 in the length direction are exposed to the outside of the housing 41.

[0184] The both side end portions can be formed with contact protrusions protruding upward by a predetermined distance. The contact protrusions come into contact with the fixed contact 22.

[0185] The contact protrusions can be formed at positions corresponding to the respective fixed contacts 22. Therefore, the movement distance of the movable contact 43 is reduced, and the contact reliability of the fixed contact 22 with the movable contact 43 is improved.

[0186] The width of the movable contact 43 can be the same as the distance by which the respective side surfaces of the housing 41 are spaced apart from each other. That is, when the movable contact 43 is housed in the housing 41, the width direction side surfaces of the movable contact 43 can come into contact with the inner surfaces of the respective side surfaces of the housing 41.

[0187] Thus, the state in which the movable contact 43 is housed in the housing 41 can be stably maintained.

[0188] The shaft 44 can transmit a driving force generated due to the operation of the core 30 to the movable contact portion 40. Specifically, the shaft 44 is connected with the movable core 32 and the movable contact 43. When the movable core 32 moves upward or downward, the movable contact 43 can also move upward or downward due to the shaft 44.

[0189] The shaft 44 can be formed so as to extend in the length direction (the upward and downward direction in the illustrated embodiment).

[0190] The lower end portion of the shaft 44 is inserted into the movable core 32. When the movable core 32 moves in the upward and downward direction, the shaft 44 can move in the upward and downward direction together with the movable core 32.

[0191] The main body of the shaft 44 is through-coupled to the fixed core 31 in a manner so as to be movable upward and downward. The main body portion of the shaft 44 has the return spring 36 through-coupled thereto.

[0192] The upper end portion of the shaft 44 is coupled to the housing 41. When the movable core 32 moves, the shaft 44 and the housing 41 can move together.

[0193] The upper end portion and the lower end portion of the shaft 44 can be formed so as to have a larger diameter than the main body portion of the shaft 44. Thus, the shaft 44 can maintain a stable coupled state with the housing 41 and the movable core 32.

[0194] The elastic portion 45 elastically supports the movable contact 43. When the movable contact 43 comes into contact with the fixed contact 22, the movable contact 43 has a tendency to move away from the fixed contact 22 due to electromagnetic repulsion. At this time, the elastic portion 45 prevents the movable contact 43 from being arbitrarily separated from the fixed contact 22 by elastically supporting the movable contact 43.

[0195] The elastic portion 45 can have any form capable of storing a restoring force by changing a shape and providing the stored restoring force to other members. In one embodiment, the elastic portion 45 can be provided in the form of a coil spring.

[0196] One side end portion of the elastic portion 45 toward the movable contact 43 is in contact with the lower side of the movable contact 43. In addition, the other side end portion opposite to the one side end portion is in contact with the upper side of the housing 41.

[0197] The elastic portion 45 can elastically support the movable contact 43 in a state in which a restoring force is stored due to being compressed by a predetermined distance. Thus, even if electromagnetic repulsion is generated between the movable contact 43 and the fixed contact 22, the movable contact 43 does not arbitrarily move.

[0198] For stable coupling of the elastic portion 45, a protruding portion (not shown) that is inserted into the elastic portion 45 can be formed on the lower side of the movable contact 43. Similarly, a protruding portion (not shown) that is inserted into the elastic portion 45 can also be formed on the upper side of the housing 41.

[0199] 3. Description of the Arc Path Forming Portion 100 According to an Embodiment of the Present Invention

[0200] Reference Figures 3 to 8 An arc path forming portion 100 according to an embodiment of the present invention is shown. Hereinafter, the arc path forming portion 100 according to an embodiment of the present invention is described with reference to Figures 3 to 8

[0201] The arc path forming portion 100 described below is described on the premise that it is provided in the DC relay 1. However, it should be understood that the arc path forming portion 100 can be applied to a magnetic contactor, a magnetic switch, or the like, which is a form of device that can achieve energization and energization release with the outside by contact and separation of a fixed contact and a movable contact.

[0202] The arc path forming portion 100 forms a magnetic field inside the arc chamber 21. An electromagnetic force is formed inside the arc chamber 21 by the current flowing through the DC relay 1 and the formed magnetic field.

[0203] The arc generated as the fixed contact 22 and the movable contact 43 are separated moves to the outside of the arc chamber 21 due to the formed electromagnetic force. Specifically, the generated arc moves in the direction of the formed electromagnetic force. Therefore, it can be said that the arc path forming portion 100 forms a path of the arc (a path in which the generated arc flows).

[0204] The arc path forming portion 100 is provided in a space formed inside the upper frame 11. The arc path forming portion 100 is configured to surround the arc chamber 21. In other words, the arc chamber 21 is provided inside the arc path forming portion 100.

[0205] The inside of the arc path forming portion 100 is provided with the fixed contact 22 and the movable contact 43. The arc generated as the fixed contact 22 and the movable contact 43 are separated can be guided by the electromagnetic force formed by the arc path forming portion 100.

[0206] In the illustrated embodiment, the arc path forming portion 100 includes a first Halbach array 110, a second Halbach array 120, a first magnet frame 130, and a second magnet frame 140.

[0207] ​The first Halbach array 110 and the second Halbach array 120 can form a magnetic field together inside the arc path forming portion 100 that houses the fixed contact 22 and the movable contact 43. At this time, the first Halbach array 110 and the second Halbach array 120 can each form a magnetic field or form a magnetic field with each other.

[0208] The first Halbach array 110 is disposed adjacent to the left inner circumferential surface of the first magnet frame 130, and the second Halbach array 120 is disposed adjacent to the right inner circumferential surface of the second magnet frame 140.

[0209] In addition, the first Halbach array 110 and the second Halbach array 120 are disposed opposite each other with the fixed contact 22 and the movable contact 43 therebetween.

[0210] The first Halbach array 110 and the second Halbach array 120 form an electromagnetic force together with the current flowing through the fixed contact 22 and the movable contact 43. The electromagnetic force formed guides the generated arc when the fixed contact 22 and the movable contact 43 are separated.

[0211] At this time, the arc path forming portion 100 forms an electromagnetic force in a direction away from the center portion C thereof. Therefore, the path of the arc is also formed in a direction away from the center portion C.

[0212] That is, each of the constituent elements provided in the DC relay 1 is not damaged by the generated arc. Furthermore, the generated arc can be quickly discharged to the outside of the arc chamber 21.

[0213] The first Halbach array 110 and the second Halbach array 120 can enhance the strength of the magnetic field formed by themselves and the magnetic field formed with each other. The direction of the magnetic field formed by the Halbach array and the process of enhancing the magnetic field are well-known technologies, and thus a detailed description thereof is omitted.

[0214] In the illustrated embodiment, the first Halbach array 110 and the second Halbach array 120 are each constituted by a plurality of magnetic bodies that are continuously aligned from the front side to the rear side. That is, the first Halbach array 110 and the second Halbach array 120 are each formed to extend in the front-rear direction.

[0215] In the illustrated embodiment, the first Halbach array 110 and the second Halbach array 120 each include first magnetic blocks 111, 121 and second magnetic blocks 112, 122, and third magnetic blocks 113, 123. It should be understood that the plurality of magnetic bodies constituting the first Halbach array 110 and the second Halbach array 120 are each designated as magnetic blocks 111, 112, 133, 121, 122, 123.

[0216] The first to third magnetic blocks 111, 112, 133, 121, 122, 123 can be made of a magnetic body. In an embodiment, the first to third magnetic blocks 111, 112, 133, 121, 122, 123 can be provided as a permanent magnet or an electromagnet, etc.

[0217] The first to third magnetic blocks 111, 112, 133, 121, 122, 123 can be aligned in one direction. In the illustrated embodiment, the first to third magnetic blocks 111, 112, 133, 121, 122, 123 are aligned in the front-rear direction.

[0218] In the illustrated embodiment, the first magnetic blocks 111, 121 among the first to third magnetic blocks 111, 112, 133, 121, 122, 123 are disposed at the last side, and the third magnetic blocks 113, 123 are disposed at the frontmost side. In addition, the second magnetic blocks 112, 122 are disposed between the first magnetic blocks 111, 121 and the third magnetic blocks 113, 123.

[0219] In an embodiment, the second magnetic blocks 112, 122 can be disposed to overlap the fixed contacts 22 in the arrangement direction of the fixed contacts 22 (the left-right direction in the illustrated embodiment).

[0220] In the illustrated embodiment, the first to third magnetic blocks 111, 112, 133, 121, 122, 123 are formed to extend in the front-rear direction. However, the shape of the first to third magnetic blocks 111, 112, 133, 121, 122, 123 is not limited to the illustrated embodiment, and can be formed in various structures. For example, at least one of the first to third magnetic blocks 111, 112, 133, 121, 122, 123 can be formed to extend in a direction intersecting the front-rear direction.

[0221] The first to third magnetic blocks 111, 112, 133, 121, 122, 123 include a plurality of faces. The plurality of faces of each magnetic block 111, 112, 133, 121, 122, 123 can be magnetized according to a predetermined rule to constitute a Halbach array.

[0222] In the illustrated embodiment, the first to third magnetic blocks 111, 112, 113 of the first Halbach array 110 are disposed to overlap the first to third magnetic blocks 121, 122, 123 of the second Halbach array 120 in the left-right direction, respectively.

[0223] The first magnetic blocks 111, 121 include a first inner surface 111a, 121a facing the second magnetic blocks 112, 122 and a first outer surface 111b, 121b opposite the second magnetic blocks 112, 122.

[0224] The second magnetic blocks 112, 122 include second inner surfaces 112a, 122a facing the fixed contact 22 and the movable contact 43 and second outer surfaces 112b, 122b opposite to the fixed contact 22 and the movable contact 43.

[0225] The third magnetic blocks 113, 123 include third inner surfaces 113a, 123a facing the second magnetic blocks 112, 122 and third outer surfaces 113b, 123b opposite to the second magnetic blocks 112, 122.

[0226] At this time, the third inner surfaces 113a, 123a of the third magnetic blocks 113, 123 are magnetized to have opposite polarities to each other from the first inner surfaces 111a, 121a of the first magnetic blocks 111, 121.

[0227] In addition, the first inner surfaces 111a of the first magnetic blocks 111 provided in the first Halbach array 110 are magnetized to have the same polarity as the first inner surfaces 121a of the first magnetic blocks 121 provided in the second Halbach array 120.

[0228] Therefore, it should be understood that the third inner surfaces 113a of the third magnetic blocks 113 provided in the first Halbach array 110 are magnetized to have the same polarity as the third inner surfaces 123a of the third magnetic blocks 123 provided in the second Halbach array 120.

[0229] Therefore, the generated arc can be guided to the edges of the magnet frames 130, 140, i.e., the edges of the arc chamber 21. Therefore, the total length of the path A.P of the generated arc can be further increased. That is, the generated arc can be effectively extinguished and exhausted.

[0230] In addition, since the magnetic field formed by the Halbach arrays 110, 120 is formed in a direction away from the fixed contact 22 and the movable contact 43, the generated arc can move in a direction away from the fixed contact 22 and the movable contact 43 and be extinguished. Therefore, not only the fixed contact 22 and the movable contact 43 can be prevented from being damaged, but also various constituent elements provided near the center portion for the operation of the DC relay 1 can be prevented from being damaged.

[0231] In Figure 5 In the illustrated embodiment, the second inner surfaces 112b of the second magnetic blocks 112 provided in the first Halbach array 110 are magnetized to have opposite polarities to each other from the second inner surfaces 122b of the second magnetic blocks 122 provided in the second Halbach array 120.

[0232] In Figure 6In the illustrated embodiment, the second inner surface 112 b of the second magnetic block 112 disposed in the first Halbach array 110 and the second inner surface 122 b of the second magnetic block 122 disposed in the second Halbach array 120 are magnetized to the same polarity.

[0233] The first Halbach array 110 and the second Halbach array 120 are respectively arranged adjacent to the inner circumferential surfaces of the magnet frames 130 and 140 .

[0234] The magnet frames 130 and 140 are formed to extend in the longitudinal direction (the left-right direction in the illustrated embodiment). The shapes of the magnet frames 130 and 140 can be changed according to the shapes of the upper frame 11 and the arc chamber 21.

[0235] In the illustrated embodiment, the length of the magnet frames 130 and 140 in the front-to-back direction (the extending direction of the Halbach arrays 110 and 120 ) is formed to be shorter than the length in the left-to-right direction.

[0236] Multiple magnet frames 130 and 140 are provided, spaced apart from each other. In the illustrated embodiment, the first and second magnet frames 130 and 140 of the magnet frames 130 and 140 are arranged symmetrically with respect to a center portion C. Specifically, the first magnet frame 130 is located to the left of the center portion C, and the second magnet frame 140 is located to the right.

[0237] The fixed contact 22 and the movable contact 43 are housed within the interior space enclosed by the first and second magnet frames 130, 140. Furthermore, the arc chamber 21 is housed within the interior space. In the illustrated embodiment, the length of the interior space in the left-right direction (the direction in which the fixed contacts 22 are arranged) is greater than the length in the front-to-back direction.

[0238] In the space, the movable contact 43 can move toward the fixed contact 22 (downward in the illustrated embodiment) or away from the fixed contact 22 (upward in the illustrated embodiment).

[0239] In addition, a path of the arc generated in the arc chamber 21 is formed in the space portion. This is achieved by the magnetic field formed by the first Halbach array 110 and the second Halbach array 120 .

[0240] In one embodiment, the central portion of the space portion may coincide with the central portion C of the arc path forming portion 100 .

[0241] The center portion C is provided between the first fixed contact 22a and the second fixed contact 22b. Furthermore, the center portion of the movable contact portion 40 is located vertically below the center portion C. Specifically, the center portions of the housing 41, cover 42, movable contact 43, shaft 44, and elastic portion 45 are located vertically below the center portion C.

[0242] The first Halbach array 110 is disposed adjacent to the inner circumference of the first magnet frame 130. Specifically, the first Halbach array 110 is coupled to a surface of the first magnet frame 130 facing the fixed contacts 22 and the movable contacts 43 (the right side in the illustrated embodiment).

[0243] In the illustrated embodiment, the first magnet frame 130 includes an inserting portion 131 , an upper end fixing portion 132 , a lower end fixing portion 133 , and a spacer 134 .

[0244] The insertion portion 131 is a portion where the first magnet frame 130 and the upper frame 11 are directly coupled.

[0245] The insertion portion 131 is formed to protrude from one end (the upper end in the illustrated embodiment) of the first magnet frame 130 facing the upper frame 11 in a direction (the upper side in the illustrated embodiment) facing the upper frame 11 .

[0246] The upper frame 11 is formed with a through hole (not shown) for the insertion portion 131 to be inserted. In the illustrated embodiment, the insertion portion 131 has a hook portion protruding in the left-right direction and can be fixed in a state of being inserted into the through hole of the upper frame 11.

[0247] However, the insertion portion 131 is not limited to the illustrated embodiment, and may be formed in any form as long as it can be fixed in a state of being inserted into the through hole of the upper frame 11 .

[0248] An upper end fixing portion 132 for preventing the first Halbach array 110 from being detached may be formed at one end (the upper end in the illustrated embodiment) of the first magnet frame 130 .

[0249] The upper end fixing portion 132 is configured to contact the upper end of the first Halbach array 110. Therefore, the upper end fixing portion 132 supports the first Halbach array 110 at the upper side and prevents the first Halbach array 110 from moving upward.

[0250] In the illustrated embodiment, the upper fixing portion 132 is disposed at the upper end of the inner circumference of the first magnet frame 130 and is formed to protrude in a direction away from the inner circumference of the first magnet frame 130 (to the right in the illustrated embodiment).

[0251] A plurality of upper end fixing portions 132 can be provided. At this time, it is preferable that the upper end fixing portions 132 are provided in the same number as the number of the magnetic blocks of the first Halbach array 110 and are disposed on the upper sides of the magnetic blocks 111, 112, and 113. In the illustrated embodiment, three upper end fixing portions 132 are provided to be disposed on the upper sides of the first magnetic block 111, the second magnetic block 112, and the third magnetic block 113, respectively.

[0252] The other end (lower end in the illustrated embodiment) of the first magnet frame 130 can be formed with a lower end fixing portion 133 for preventing the first Halbach array 110 from being detached.

[0253] The lower end fixing portion 133 is disposed to be in contact with the lower end of the first Halbach array 110. Thus, the lower end fixing portion 133 supports the first Halbach array 110 on the lower side, preventing the first Halbach array 110 from moving downward.

[0254] In the illustrated embodiment, the lower end fixing portion 133 is disposed on the lower end of the inner circumferential surface of the first magnet frame 130 and is formed to protrude in a direction away from the inner circumferential surface of the first magnet frame 130 (right side in the illustrated embodiment).

[0255] In addition, the lower end fixing portion 133 can be disposed opposite the upper end fixing portion 132 with the first Halbach array 110 interposed therebetween.

[0256] A plurality of lower end fixing portions 133 can be provided. At this time, it is preferable that the lower end fixing portions 133 are provided in the same number as the number of the magnetic blocks of the first Halbach array 110 and are disposed on the lower sides of the magnetic blocks 111, 112, and 113. In the illustrated embodiment, three lower end fixing portions 133 are provided to be disposed on the lower sides of the first magnetic block 111, the second magnetic block 112, and the third magnetic block 113, respectively.

[0257] In addition, the inner circumferential surface of the first magnet frame 130 is provided with spacers 134 that are spaced apart from each other with respect to the upper end fixing portions 132 and the lower end fixing portions 133.

[0258] The spacers 134 are disposed between two magnetic blocks of the first Halbach array 110 that are adjacent to each other, so as to space the two magnetic blocks apart from each other.

[0259] The spacers 134 are disposed on the inner circumferential surface of the first magnet frame 130. At this time, the spacers 134 are formed to protrude in a direction away from the inner circumferential surface of the first magnet frame 130 (right direction in the illustrated embodiment).

[0260] The spacers 134 are arranged between two magnetic blocks of the first Halbach array 110 that are adjacent to each other. In the illustrated embodiment, the spacers 134 are arranged between the rear side of the first magnetic block 111, the first magnetic block 111 and the second magnetic block 112, the second magnetic block 112 and the third magnetic block 113, and the front side of the third magnetic block 113.

[0261] Therefore, the two magnetic blocks can be spaced apart from each other by the spacers 134. Thus, the magnetic blocks 111, 112, 113 constituting the first Halbach array 110 are not moved by the attractive force or the repulsive force between them, and the relative positions between them can be maintained. That is, any of the first to third magnetic blocks 111, 112, 113 can be prevented from being separated. Thus, a material such as an adhesive for fixing the magnetic body can be omitted, and the manufacturing cost of the entire DC relay 1 can be reduced.

[0262] The magnetic blocks 111, 112, 113 constituting the first Halbach array 110 can generate a rotational torque by the attractive force and the repulsive force between them. The spacers 134 support the magnetic blocks 111, 112, 113 of the first Halbach array 110 in the arrangement direction (the front-rear direction in the illustrated embodiment) of the magnetic blocks 111, 112, 113 of the first Halbach array 110, and can prevent the rotation of the magnetic blocks 111, 112, 113 due to the attractive force or the repulsive force between them.

[0263] Therefore, damage to the DC relay 1 due to any movement of the magnetic blocks 111, 112, 113 can be prevented. Thus, the overall durability of the DC relay 1 including the arc path forming portion 100 can be further improved, and the expected life can be further extended.

[0264] The spacers 134 are formed so as to extend between two magnetic blocks of the first Halbach array 110 that are adjacent to each other. In the illustrated embodiment, the spacers 134 are formed so as to extend in the up-down direction.

[0265] In one embodiment, the spacers 134 can be integrally formed with the inner circumferential surface of the first magnet frame 130. For example, the spacers 134 can be manufactured by sheet metal processing in which a force is applied toward the inside of the radial direction at a portion of the first magnet frame 130.

[0266] In one embodiment, the height of the spacers 134 in the extension direction decreases as it is farther from the inner circumferential surface of the first magnet frame 130. In the illustrated embodiment, the height of the spacers 134 in the up-down direction gradually decreases from the left side surface to the right side surface of the first magnet frame 130. This is to minimize cracks generated in the sheet metal process and to more stably support the first Halbach array 110 by maximizing the protruding width of the spacers 134.

[0267] A plurality of spacers 134 can be provided.

[0268] One magnetic block of the first Halbach array 110 can be disposed between two spacers 134 different from each other. That is, two spacers 134 different from each other can be disposed opposite each other with one magnetic block of the first Halbach array 110 interposed therebetween.

[0269] In one embodiment, the distance between the two spacers 134 different from each other can be configured to correspond to the length of the one magnetic block in the arrangement direction (front-rear direction in the illustrated embodiment) of the first Halbach array 110.

[0270] Accordingly, the distance between two magnetic blocks adjacent to each other can be adjusted by the spacers 134. That is, the assembly of the first magnet frame 130 and the first Halbach array 110 becomes easier. At this time, the distance between the two magnetic blocks can be more precisely guided and adjusted by the thickness and position of the spacers 134, etc.

[0271] The thickness of the spacers 134 in the arrangement direction (front-rear direction in the illustrated embodiment) of the first Halbach array 110 can be formed to correspond to the distance between two magnetic blocks adjacent to each other of the Halbach arrays 110, 120.

[0272] Accordingly, the distance between the two magnetic blocks can be adjusted by the thickness and position of the spacers 134, etc. Accordingly, the direction and strength of the magnetic field formed by the Halbach arrays 110, 120 can be more finely adjusted.

[0273] In one embodiment, the thickness of the spacers 134 in the arrangement direction (front-rear direction in the illustrated embodiment) of the first Halbach array 110 can be 1 mm or more and 2 mm or less.

[0274] If the thickness of the spacers 134 in the front-rear direction is too large, the magnetic force between the magnetic blocks 111, 112, 113 of the first Halbach array 110 decreases, which can cause the magnetic field inside the arc path forming portion 100 to not be sufficiently formed.

[0275] On the contrary, if the thickness of the spacers 134 in the front-rear direction is too small, the repulsive force between the magnetic blocks 111, 112, 113 of the first Halbach array 110 increases, which makes it difficult to prevent the magnetic blocks 111, 112, 113 from being arbitrarily separated and maintain the positions of the magnetic blocks 111, 112, 113.

[0276] In addition, the spacers 134 can be provided in plurality between two magnetic blocks adjacent to each other of the first Halbach array 110. In the illustrated embodiment, the spacers 134 are configured in two rows in a longitudinal direction between the first magnetic block 111 and the second magnetic block 112 and between the second magnetic block 112 and the third magnetic block 113, respectively. This is to reduce the length of each spacer 134 in the left-right direction and to improve durability.

[0277] The first magnet frame 130 is configured to face the second magnet frame 140 with the fixed contact 22, the movable contact 43, the first Halbach array 110, and the second Halbach array 120 interposed therebetween.

[0278] The second Halbach array 120 is configured to be adjacent to the inner circumferential surface of the second magnet frame 140. Specifically, the second Halbach array 120 is incorporated on the side (left side in the illustrated embodiment) of the second magnet frame 140 facing the fixed contact 22 and the movable contact 43.

[0279] In the illustrated embodiment, the second magnet frame 140 includes an insertion portion 141, an upper end fixing portion 142, a lower end fixing portion 143, and a spacer 144.

[0280] The insertion portion 141 is a portion of the second magnet frame 140 directly incorporated with the upper frame 11.

[0281] The insertion portion 141 is formed to protrude from the end (upper end in the illustrated embodiment) of the second magnet frame 140 toward the upper frame 11 toward the direction (upward direction in the illustrated embodiment) of the upper frame 11.

[0282] The upper frame 11 is formed with a through-hole (not shown) for being inserted by the insertion portion 141. In the illustrated embodiment, the insertion portion 141 has a hooking portion protruding in the left-right direction and can be fixed in a state of being inserted into the through-hole of the upper frame 11.

[0283] However, the insertion portion 141 is not limited to the illustrated embodiment and can be formed in any form as long as it can be fixed in a state of being inserted into the through-hole of the upper frame 11.

[0284] The end (upper end in the illustrated embodiment) of the second magnet frame 140 can be formed with the upper end fixing portion 142 for preventing any detachment of the second Halbach array 120.

[0285] The upper end fixing portion 142 is configured to be in contact with the upper end of the second Halbach array 120. Thus, the upper end fixing portion 142 supports the second Halbach array 120 on the upper side and prevents upward movement of the second Halbach array 120.

[0286] In the illustrated embodiment, the upper end fixing portion 142 is provided on the inner circumferential surface of the second magnet frame 140 at the upper end, and is formed so as to protrude in a direction away from the inner circumferential surface of the second magnet frame 140 (left side in the illustrated embodiment).

[0287] A plurality of upper end fixing portions 142 can be provided. In this case, it is preferable that the upper end fixing portions 142 be provided in the same number as the number of magnetic blocks of the second Halbach array 120, and be arranged on the upper side of each of the magnetic blocks 121, 122, 123. In the illustrated embodiment, three upper end fixing portions 142 are provided so as to be arranged on the upper side of each of the first magnetic block 121, the second magnetic block 122, and the third magnetic block 123.

[0288] The other end (lower end in the illustrated embodiment) of the second magnet frame 140 can be formed with a lower end fixing portion 143 for preventing the second Halbach array 120 from coming off.

[0289] The lower end fixing portion 143 is arranged so as to come into contact with the lower end of the second Halbach array 120. Thus, the lower end fixing portion 143 supports the second Halbach array 120 on the lower side, and prevents the second Halbach array 120 from moving downward.

[0290] In the illustrated embodiment, the lower end fixing portion 143 is provided on the inner circumferential surface of the second magnet frame 140 at the lower end, and is formed so as to protrude in a direction away from the inner circumferential surface of the second magnet frame 140 (left side in the illustrated embodiment).

[0291] In addition, the lower end fixing portion 143 can be arranged so as to face the upper end fixing portion 142 with the second Halbach array 120 interposed therebetween.

[0292] A plurality of lower end fixing portions 143 can be provided. In this case, it is preferable that the lower end fixing portions 143 be provided in the same number as the number of magnetic blocks of the second Halbach array 120, and be arranged on the lower side of each of the magnetic blocks 121, 122, 123. In the illustrated embodiment, three lower end fixing portions 143 are provided so as to be arranged on the lower side of each of the first magnetic block 121, the second magnetic block 122, and the third magnetic block 123.

[0293] In addition, the inner circumferential surface of the second magnet frame 140 is provided with spacers 144 that are interposed between the upper end fixing portion 142 and the lower end fixing portion 143.

[0294] The spacers 144 are arranged between two magnetic blocks of the second Halbach array 120 that are adjacent to each other, so as to separate the two magnetic blocks from each other.

[0295] The spacers 144 are arranged on the inner circumferential surface of the second magnet frame 140. In this case, the spacers 144 are formed so as to protrude in a direction away from the inner circumferential surface of the second magnet frame 140 (left direction in the illustrated embodiment).

[0296] The spacers 144 are disposed between two magnetic blocks adjacent to each other of the second Halbach array 120. In the illustrated embodiment, the spacers 144 are disposed at the rear side of the first magnetic block 121, between the first magnetic block 121 and the second magnetic block 122, between the second magnetic block 122 and the third magnetic block 123, and at the front side of the third magnetic block 123.

[0297] Since the function and effect of the spacers 144 having the above-described structure are the same as those of the spacers 134 of the first magnet frame 130 described above, a description thereof will be omitted.

[0298] The spacers 144 are formed to extend in the second Halbach array 120 between two magnetic blocks adjacent to each other. In the illustrated embodiment, the spacers 144 are formed to extend in the up-down direction.

[0299] In an embodiment, the spacers 144 can be integrally formed with the inner circumferential surface of the second magnet frame 140. For example, the spacers 144 can be manufactured by sheet metal processing in which a force is applied toward the inside of the radial direction at a portion of the second magnet frame 140.

[0300] In an embodiment, the height of the spacers 144 in the extension direction decreases as it is farther from the inner circumferential surface of the second magnet frame 140. In the illustrated embodiment, the height of the spacers 144 in the up-down direction gradually decreases from the right side surface to the left side of the second magnet frame 140. This is to minimize cracks generated in the sheet metal process and to more stably support the second Halbach array 120 by maximizing the protrusion width of the spacers 144.

[0301] A plurality of spacers 144 can be provided.

[0302] One magnetic block of the second Halbach array 120 can be disposed between two spacers 144 different from each other. That is, the two spacers 144 different from each other can be disposed opposite to each other with the one magnetic block of the second Halbach array 120 interposed therebetween.

[0303] In an embodiment, the distance between the two spacers 144 different from each other can be configured to correspond to the length of the one magnetic block in the arrangement direction (the front-rear direction in the illustrated embodiment) of the second Halbach array 120.

[0304] The thickness of the spacer 144 in the arrangement direction of the first Halbach array 110 (the front-to-back direction in the illustrated embodiment) can be formed to correspond to the distance between two adjacent magnetic blocks in the Halbach arrays 110 and 120. In one embodiment, the thickness of the spacer 144 in the arrangement direction of the second Halbach array 120 (the front-to-back direction in the illustrated embodiment) can be greater than 1 mm and less than 2 mm.

[0305] Since the function and effect of the spacer 144 using the above structure are the same as those of the spacer 134 of the first magnet frame 130 , they are omitted.

[0306] In addition, a plurality of spacers 144 may be provided between two adjacent magnetic blocks along the second Halbach array 120. In the illustrated embodiment, the spacers 144 are arranged in two longitudinal rows between the first magnetic block 121 and the second magnetic block 122, and between the second magnetic block 122 and the third magnetic block 123.

[0307] 4. Description of the Arc Path AP Formed by the Arc Path Forming Part 100 According to the Embodiment of the Present Invention

[0308] Below, refer to Figures 9 to 10 , an arc path AP formed by the arc path forming portion 100 according to an embodiment of the present invention will be described.

[0309] As described above, the first to third magnetic blocks 111 , 112 , 113 of the first Halbach array 110 may be arranged to overlap the first to third magnetic blocks 121 , 122 , 123 of the second Halbach array 120 in the left-right direction, respectively.

[0310] In addition, the first inner surfaces 111 a and 121 a of the first magnetic blocks 111 and 121 are magnetized to opposite polarities to the third inner surfaces 113 a and 123 a of the third magnetic blocks 113 and 123 .

[0311] Therefore, the generated arc can be guided to the edge of the magnet frames 130 and 140 (ie, the edge of the arc chamber 21 ), thereby further increasing the total length of the arc path AP. In other words, the generated arc can be effectively extinguished and discharged.

[0312] Furthermore, because the magnetic field generated by the Halbach arrays 110 and 120 is formed in a direction away from the fixed contacts 22 and the movable contact 43, the generated arc can be moved away from the fixed contacts 22 and the movable contact 43 and extinguished. This prevents damage not only to the fixed contacts 22 and the movable contact 43 but also to various components located near the center of the DC relay 1 that operate the DC relay 1.

[0313] In Figure 9 In the illustrated embodiment, the second inner surface 112b of the second magnetic block 112 provided to the first Halbach array 110 is magnetized to have a polarity opposite to that of the second inner surface 122b of the second magnetic block 122 provided to the second Halbach array 120.

[0314] At this time, the magnetic field formed by the first Halbach array 110 is formed toward the rear right side. Thus, the path A.P of the electric arc can be guided toward the rear left side.

[0315] In addition, the magnetic field formed by the second Halbach array 120 is formed toward the front right side. Thus, the path A.P of the electric arc can be guided toward the rear right side.

[0316] As described above, the electric arc generated by both the first Halbach array 110 and the second Halbach array 120 can be guided to the edge of the magnet frame 130, 140 (i.e., the edge of the arc chamber 21).

[0317] In Figure 10 In the illustrated embodiment, the second inner surface 112b of the second magnetic block 112 provided to the first Halbach array 110 is magnetized to have the same polarity as that of the second inner surface 122b of the second magnetic block 122 provided to the second Halbach array 120.

[0318] At this time, the magnetic field formed by the first Halbach array 110 is formed toward the front right side. Thus, the path A.P of the electric arc can be guided toward the front left side.

[0319] In addition, the magnetic field formed by the second Halbach array 120 is formed toward the rear left side. Thus, the path A.P of the electric arc can be guided toward the rear right side.

[0320] As described above, the electric arc generated by both the first Halbach array 110 and the second Halbach array 120 can be guided to the edge of the magnet frame 130, 140 (i.e., the edge of the arc chamber 21).

[0321] The above has been described with reference to preferred embodiments of the present application, but the present application is not limited to the structure of the described embodiments.

[0322] In addition, the present application can be variously modified and changed by those skilled in the art without departing from the idea and scope of the present application described in the claims.

[0323] Further, the described embodiments can be configured in a manner in which all or part of the embodiments are selectively combined to achieve diversified modifications.

[0324] 1: DC relay; 10: frame portion;

[0325] 11: upper frame; 12: lower frame;

[0326] 13: insulating plate; 14: support plate;

[0327] 20: opening and closing portion; 21: arc chamber;

[0328] 22: fixed contact; 22a: first fixed contact;

[0329] 22b: second fixed contact; 23: sealing member;

[0330] 30: core; 31: fixed core;

[0331] 32: movable core; 33: magnetic yoke;

[0332] 34: bobbin; 35: coil;

[0333] 36: return spring; 37: cylinder;

[0334] 40: movable contact portion; 41: housing;

[0335] 42: cover; 43: movable contact;

[0336] 44: shaft; 45: elastic portion;

[0337] 100: arc path forming portion; 110: first Halbach array;

[0338] 111: first magnetic block; 111a: first inner surface;

[0339] 111b: first outer surface; 112: second magnetic block;

[0340] 112a: first inner surface; 112b: first outer surface;

[0341] 113: third magnetic block; 113a: first inner surface;

[0342] 113b: first outer surface; 120: second Halbach array;

[0343] 121: first magnetic block; 121a: first inner surface;

[0344] 121b: first outer surface; 122: second magnetic block;

[0345] 122a: first inner surface; 122b: first outer surface;

[0346] 123: third magnetic block; 123a: first inner surface;

[0347] 123b: first outer surface; 130: first magnet frame;

[0348] 131: insertion portion; 132: upper end fixing portion;

[0349] 133: lower end fixing portion; 134: spacer;

[0350] 140: second magnet frame; 141: insertion portion;

[0351] 142: upper end fixing portion; 143: lower end fixing portion;

[0352] 144: spacer; A.P: path of electric arc.

Claims

1. An arc path forming portion, characterized in that: include: A magnet frame having a space portion formed therein for accommodating the fixed contact and the movable contact, and The Halbach array includes a plurality of magnetic blocks formed of a magnetic body, wherein the plurality of magnetic blocks form a magnetic field in the space portion and are arranged adjacent to the inner circumference of the magnet frame and aligned in one direction; The Halbach array comprises: The first magnet, a second magnetic block arranged to overlap with the first magnetic block in the one direction, and a third magnetic block, arranged opposite to the first magnetic block with the second magnetic block interposed therebetween; The surface of the first magnetic block facing the third magnetic block is magnetized to a polarity opposite to the polarity of the surface of the third magnetic block facing the first magnetic block.

2. The arc path forming portion according to claim 1, wherein: The Halbach array comprises: a first Halbach array disposed adjacent to one side of the magnet frame, and a second Halbach array disposed adjacent to the other surface of the magnet frame and facing the first Halbach array with the fixed contact and the movable contact interposed therebetween; Each of the first Halbach array and the second Halbach array is provided with the first magnetic block, the second magnetic block and the third magnetic block.

3. The arc path forming portion according to claim 2, wherein: The space portion is formed so that the length in one direction is smaller than the length in the other direction. The first magnetic block, the second magnetic block and the third magnetic block arranged in the first Halbach array are respectively overlapped with the first magnetic block, the second magnetic block and the third magnetic block arranged in the second Halbach array in the other direction. The surface of the first magnetic block disposed in the first Halbach array facing the second magnetic block is magnetized to the same polarity as the polarity of the surface of the first magnetic block disposed in the second Halbach array facing the second magnetic block.

4. The arc path forming portion according to claim 3, wherein: The surfaces of the second magnetic block provided in the first Halbach array and the second magnetic block provided in the second Halbach array facing the fixed contact and the movable contact are magnetized to opposite polarities.

5. The arc path forming portion according to claim 3, wherein: The surfaces of the second magnetic block provided in the first Halbach array and the second magnetic block provided in the second Halbach array facing the fixed contact and the movable contact are magnetized to the same polarity.

6. The arc path forming portion according to claim 1, wherein: The magnet frame comprises: a spacer disposed on the inner circumferential surface of the magnet frame and between two adjacent magnetic blocks of the Halbach array, wherein the spacer is formed to protrude in a direction away from the inner circumferential surface of the magnet frame, and the thickness of the spacer in the one direction is formed to correspond to the distance between the two adjacent magnetic blocks; Two different spacers are provided. The two different spacers are arranged opposite to each other across a magnetic block provided in the Halbach array. The interval between the two different spacers is configured to correspond to the length of the magnetic block in the one direction.

7. The arc path forming portion according to claim 1, wherein: At least one of the first magnetic block, the second magnetic block, and the third magnetic block extends in a direction intersecting the one direction.

8. A DC relay, characterized in that: include: A plurality of fixed contacts are arranged spaced apart from each other, The movable contact contacts or separates from the fixed contact. A magnet frame having a space portion formed therein for accommodating the fixed contact and the movable contact, and The Halbach array includes a plurality of magnetic blocks formed of a magnetic body, wherein the plurality of magnetic blocks form a magnetic field in the space portion and are arranged adjacent to the inner circumference of the magnet frame and aligned in one direction; The Halbach array comprises: The first magnet, a second magnetic block arranged to overlap with the first magnetic block in the one direction, and a third magnetic block, arranged opposite to the first magnetic block with the second magnetic block interposed therebetween; The surface of the first magnetic block facing the third magnetic block is magnetized to a polarity opposite to the polarity of the surface of the third magnetic block facing the first magnetic block.

9. The DC relay according to claim 8, characterized in that: The Halbach array comprises: a first Halbach array disposed adjacent to one side of the magnet frame, and a second Halbach array disposed adjacent to the other surface of the magnet frame and facing the first Halbach array with the fixed contact and the movable contact interposed therebetween; Each of the first Halbach array and the second Halbach array is provided with the first magnetic block, the second magnetic block and the third magnetic block.

10. The DC relay according to claim 9, characterized in that: The space portion is formed so that the length in one direction is smaller than the length in the other direction. The first magnetic block, the second magnetic block and the third magnetic block arranged in the first Halbach array are respectively overlapped with the first magnetic block, the second magnetic block and the third magnetic block arranged in the second Halbach array in the other direction. The surface of the first magnetic block disposed in the first Halbach array facing the second magnetic block is magnetized to the same polarity as the polarity of the surface of the first magnetic block disposed in the second Halbach array facing the second magnetic block.

11. The DC relay according to claim 8, characterized in that: The magnet frame comprises: a spacer disposed on the inner circumferential surface of the magnet frame and between two adjacent magnetic blocks of the Halbach array, wherein the spacer is formed to protrude in a direction away from the inner circumferential surface of the magnet frame, and the thickness of the spacer in the one direction is formed to correspond to the distance between the two adjacent magnetic blocks; Two different spacers are provided. The two different spacers are arranged opposite to each other across a magnetic block provided in the Halbach array. The distance between the two different spacers is configured to correspond to the length of the magnetic block in the one direction.

12. The DC relay according to claim 8, characterized in that: At least one of the first magnetic block, the second magnetic block, and the third magnetic block extends in a direction intersecting the one direction.

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