Arc path forming portion and DC relay including same

Abstract

The present invention discloses an arc path forming part and a DC relay including the same, which can effectively guide a generated arc toward the outside, and includes a magnet holder part including a first holder and a second holder that are different from each other and are disposed between the outside of an arc chamber and the inside of a frame, and a magnet part that is attached to one surface of the magnet holder part facing the arc chamber and forms a magnetic field in the arc chamber, the first holder and the second holder each extend by being bent at a predetermined angle, and have magnet parts attached to both ends, and the magnetic field formed by the magnet parts forms an electromagnetic force together with a current flowing through the DC relay, and guides the arc in a direction away from a fixed contact.

Description

[Technical field]

[0001] The present invention relates to an arc path forming part and a DC relay including the same, and more particularly, to an arc path forming part capable of effectively guiding a generated arc to the outside and a DC relay including the same. [Background technology]

[0002] A direct current relay is a device that uses the principle of electromagnetism to transmit mechanical drive or current signals. Direct current relays are also called magnetic switches and are generally classified as electrical circuit switching devices.

[0003] The DC relay includes a fixed contact and a movable contact. The fixed contact is electrically connected to an external power source and a load. The fixed contact and the movable contact may be in contact with each other or may be spaced apart from each other.

[0004] The contact and separation of the fixed and movable contacts allows or blocks current flow through the DC relay, said movement being accomplished by a drive that applies a driving force to the movable contact.

[0005] When the fixed contact and the moving contact are separated, an arc occurs between them. An arc is a current flow with high voltage and high temperature. Therefore, the arc must be quickly discharged from the DC relay through a predetermined path.

[0006] The arc exhaust path is formed by a magnet provided in the DC relay. The magnet generates a magnetic field in the space between the fixed contact and the movable contact. The magnetic field and the electromagnetic force generated by the current flow form the arc exhaust path.

[0007] In conventional DC relays, the electromagnetic force acting on some of the fixed contacts is directed inward, i.e., toward the center of the movable contact, so that an arc generated at that position cannot be immediately discharged to the outside.

[0008] In the center of the DC relay, i.e., in the space between the fixed contacts, various members for driving the movable contact in the up and down direction are provided. For example, a shaft, a spring member inserted into the shaft, etc. are provided in the above-mentioned positions.

[0009] Therefore, if the generated arc moves toward the center portion, and if the arc that has moved to the center portion does not immediately move outward, various components provided at that position may be damaged by the energy of the arc.

[0010] In addition, the direction of the electromagnetic force generated inside a conventional DC relay depends on the direction of the current passing through the fixed contacts. That is, the position of the electromagnetic force generated in the inward direction among the electromagnetic forces generated at each fixed contact varies depending on the direction of the current.

[0011] That is, a user must consider the direction of the current every time he or she uses the DC relay, which can cause inconvenience when using the DC relay. Also, it is impossible to eliminate a situation in which the direction of the current applied to the DC relay changes due to an improper operation regardless of the user's intention.

[0012] In this case, the generated arc may damage the components in the center of the DC relay, which may not only reduce the service life of the DC relay, but may also cause a safety accident.

[0013] Korean Patent Publication No. 10-1696952 discloses a DC relay, specifically, a DC relay having a structure that uses multiple permanent magnets to prevent the movement of a movable contact.

[0014] However, this type of DC relay can prevent the movement of the movable contacts by using a plurality of permanent magnets, but has a limitation in that there is no consideration of a method for controlling the direction of the arc discharge path.

[0015] Korean Patent Publication No. 10-1216824 discloses a DC relay, specifically, a DC relay having a structure that can prevent any separation between a movable contact and a fixed contact by using a damping magnet.

[0016] However, this type of DC relay only provides a method for maintaining the contact state between the movable contact and the fixed contact, i.e., it has a limitation in that it does not provide a method for forming an exhaust path for the arc that occurs when the movable contact and the fixed contact are separated. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Korean Patent Registration No. 10-1696952 (2017.01.16.) [Patent Document 2] Korean Patent Registration No. 10-1216824 (2012.12.28.) Summary of the Invention [Problem to be solved by the invention]

[0018] An object of the present invention is to provide an arc path forming portion capable of quickly extinguishing and discharging an arc that occurs when a flowing current is interrupted, and a DC relay including the same.

[0019] Another object of the present invention is to provide an arc path forming part capable of increasing the magnitude of force for inducing a generated arc, and a DC relay including the same.

[0020] It is yet another object of the present invention to provide an arc path forming unit capable of preventing damage to components for current flow due to an arc generated, and a DC relay including the same.

[0021] It is yet another object of the present invention to provide an arc path forming unit capable of preventing arcs generated at a plurality of positions from crossing each other, and a DC relay including the same.

[0022] It is still another object of the present invention to provide an arc path forming portion and a DC relay including the same, which can achieve the above object without requiring a major design change. [Means for solving the problem]

[0023] In order to achieve the above object, an arc path forming unit according to an embodiment of the present invention includes an arc chamber in which a plurality of fixed contacts and a movable contact are housed; a magnet holder unit arranged outside the arc chamber and including a first holder and a second holder which are different from each other; and a magnet unit attached to one surface of the magnet holder unit facing the arc chamber and forming a magnetic field in the arc chamber, the first holder and the second holder each extend by being bent at a predetermined angle, are spaced apart from each other, and are arranged in a direction intersecting an arrangement direction of the plurality of fixed contacts, and each recess is arranged facing each other, and the magnet unit includes a first magnet and a second magnet arranged adjacent to one surface of the first holder facing the arc chamber and extending from one end or the other end of the first holder along the one surface of the first holder; and a third magnet and a fourth magnet arranged adjacent to one surface of the second holder facing the arc chamber and extending from one end or the other end of the second holder along the one surface of the second holder, and the first magnet, the second magnet, the third magnet and the fourth magnet are all magnetized with the same polarity.

[0024] In addition, in the magnet section, the first magnet and the third magnet may be arranged to face each other, and the second magnet and the fourth magnet may be arranged to face each other.

[0025] Moreover, the first magnet may extend in a direction aligned with an extension direction of the third magnet, and the second magnet may extend in a direction aligned with an extension direction of the fourth magnet.

[0026] Furthermore, the first magnet and the second magnet may have extension directions that intersect with each other.

[0027] In addition, the first magnet and the fourth magnet may be arranged opposite each other across a virtual line extending along the arrangement direction of the fixed contacts, and the second magnet and the third magnet may be arranged opposite each other across the virtual line.

[0028] The magnet portion may be formed such that the shortest distance between the first magnet and the fourth magnet is the same as the shortest distance between the second magnet and the third magnet.

[0029] The arc chamber may further include an auxiliary magnet overlapping a center point of the plurality of fixed contacts in a moving direction of the movable contact and forming a magnetic field in the arc chamber.

[0030] The auxiliary magnet may be formed so that its extension direction is aligned with the arrangement direction of the first holder and the second holder.

[0031] The extension direction of the auxiliary magnet may intersect with the arrangement direction of the first holder and the second holder.

[0032] The first magnet, the second magnet, the third magnet and the fourth magnet may correspond to one another in width direction and length in the width direction, respectively.

[0033] The first holder may be formed in a shape corresponding to that of the second holder and may be symmetrical to the second holder with respect to a center point of the plurality of fixed contacts.

[0034] The present invention also provides an arc chamber having a spaced apart fixed contacts arranged in one direction; a movable contact that comes into contact with and separates from the fixed contacts; an arc chamber having a space formed therein for accommodating the fixed contacts and the movable contacts; a frame surrounding the arc chamber; a magnet holder unit including a first holder and a second holder that are different from each other and that are disposed between the outside of the arc chamber and the inside of the frame; and a magnet unit attached to a surface of the magnet holder unit facing the arc chamber and forming a magnetic field in the arc chamber, the first holder and the second holder each being bent at a predetermined angle and extending. a first holder having a first recess and a second magnet disposed adjacent to a surface of the first holder facing the arc chamber and extending from one end or the other end of the first holder along the surface of the first holder; and a third holder having a fourth magnet disposed adjacent to a surface of the second holder facing the arc chamber and extending from one end or the other end of the second holder along the surface of the second holder, the first magnet, the second magnet, the third magnet, and the fourth magnet being all magnetized with the same polarity.

[0035] In addition, in the magnet section, the first magnet and the third magnet may be arranged to face each other, and the second magnet and the fourth magnet may be arranged to face each other.

[0036] In addition, the first magnet may extend in a direction parallel to the extension direction of the third magnet, and the second magnet may extend in a direction parallel to the extension direction of the fourth magnet, and their extension directions may intersect with the extension direction of the first magnet.

[0037] In addition, the first magnet and the fourth magnet may be arranged opposite each other across a virtual line extending along the arrangement direction of the fixed contacts, and the second magnet and the third magnet may be arranged opposite each other across the virtual line.

[0038] The arc chamber may further include an auxiliary magnet overlapping a center point of the plurality of fixed contacts in a moving direction of the movable contact and forming a magnetic field in the arc chamber.

[0039] The auxiliary magnet may be formed so that its extension direction is aligned with the arrangement direction of the first holder and the second holder.

[0040] The extension direction of the auxiliary magnet may intersect with the arrangement direction of the first holder and the second holder. Effect of the Invention

[0041] Among the various effects of the present invention, the effects that can be obtained by the above-mentioned solution are as follows.

[0042] First, the arc path forming portion includes a magnet portion. The magnet portion forms a magnetic field inside the arc path forming portion. The formed magnetic field forms an electromagnetic force together with a current flowing through the fixed contact and the movable contact housed in the arc path forming portion.

[0043] At this time, the generated arc is formed in a direction away from each fixed contact, and the arc generated when the fixed contact and the movable contact are separated can be induced by the electromagnetic force.

[0044] Therefore, the generated arc can be quickly extinguished and discharged to the outside of the arc path forming portion and the DC relay.

[0045] The magnet portion may include a plurality of magnets. The plurality of magnets are formed to enhance the strength of the electromagnetic force formed near each fixed contact. That is, the arc path forming portions formed near the same fixed contact by different magnets are formed in the same direction.

[0046] Therefore, the strength of the magnetic field formed near each fixed contact and the strength of the electromagnetic force, which depends on the strength of the magnetic field, can be strengthened, and as a result, the strength of the electromagnetic force inducing the generated arc can be strengthened, and the generated arc can be effectively extinguished and discharged.

[0047] In addition, the direction of the magnetic field generated by the magnet portion and the electromagnetic force generated by the current flowing through the fixed contact and the movable contact are directed away from the center.

[0048] Furthermore, as described above, the strength of the magnetic field and electromagnetic force is strengthened by the magnet section, so that any arc that occurs can be quickly extinguished and moved away from the center.

[0049] Therefore, damage to various components provided near the center for operation of the DC relay can be prevented.

[0050] In various embodiments, a plurality of fixed contacts may be provided. The magnet portion provided in the arc path forming portion forms magnetic fields in different directions near each fixed contact. Therefore, the paths of the arcs generated near each fixed contact advance in different directions.

[0051] Therefore, the arcs generated near the fixed contacts do not meet each other, thereby preventing malfunctions or safety accidents that may occur due to collision of arcs generated at different positions.

[0052] Moreover, the magnet section and the magnet holder section are located inside the frame surrounding the arc chamber, i.e., the magnet section and the magnet holder section are located between the inside of the frame and the outside of the arc chamber.

[0053] Therefore, no additional design change is required to dispose the magnet part and the magnet holder part outside the arc chamber.

[0054] Therefore, the arc path forming portion according to the various embodiments of the present invention can be provided in a DC relay without significant design changes, and further, the time and cost required for applying the arc path forming portion according to the various embodiments of the present invention can be reduced. [Brief description of the drawings]

[0055] [Figure 1] FIG. 1 is a front cross-sectional view showing a DC relay according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional plan view showing the DC relay of FIG. [Diagram 3] FIG. 3 is a conceptual diagram showing an arc path forming portion according to one embodiment of the present invention. [Figure 4] FIG. 4 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Diagram 5] FIG. 5 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 6] FIG. 6 is a conceptual diagram showing another example of the magnet portion provided in the arc path forming portion of FIG. [Figure 7] FIG. 7 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 8] FIG. 8 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 9] FIG. 9 is a conceptual diagram showing an arc path forming portion according to another embodiment of the present invention. [Figure 10] FIG. 10 is a conceptual diagram showing the magnetic field and arc path formed by the arc path forming portion of FIG. [Figure 11] FIG. 11 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 12] FIG. 12 is a conceptual diagram showing another example of the magnet portion provided in the arc path forming portion of FIG. [Figure 13]FIG. 13 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 14] FIG. 14 is a conceptual diagram showing the magnetic field and arc path formed by the arc path forming portion of FIG. [Figure 15] FIG. 15 is a conceptual diagram showing an arc path forming portion according to still another embodiment of the present invention. [Figure 16] FIG. 16 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 17] FIG. 17 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 18] FIG. 18 is a conceptual diagram showing another example of the magnet portion provided in the arc path forming portion of FIG. [Figure 19] FIG. 19 is a conceptual diagram showing the magnetic field and the path of the arc formed by the arc path forming portion of FIG. [Figure 20] FIG. 20 is a conceptual diagram showing the magnetic field and arc path formed by the arc path forming portion of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0056] Hereinafter, arc path forming units 100, 200, 300 and a DC relay 1 including the same according to embodiments of the present invention will be described in more detail with reference to the drawings.

[0057] In the following description, in order to clarify the features of the present invention, the description of some of the components may be omitted.

[0058] In this specification, the same reference numerals are given to the same configurations even in different embodiments, and repeated description thereof will be omitted.

[0059] The accompanying drawings are merely intended to facilitate understanding of the embodiments disclosed in this specification, and are not intended to limit the technical ideas disclosed in this specification.

[0060] A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0061] 1. Description of DC relay 1 according to an embodiment of the present invention A DC relay 1 according to an embodiment of the present invention will be described below with reference to Figs.

[0062] The DC relay 1 according to the embodiment of the present invention includes a frame portion 10, a switching portion 20, a cob 30, and a movable contact portion 40. The DC relay 1 also includes arc path forming portions 100, 200, and 300.

[0063] The arc path forming parts 100, 200, and 300 can form a discharge path for the generated arc.

[0064] The configuration of a DC relay 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. However, the frame portion 10, the opening / closing portion 20, the core portion 30, the movable contact portion 40 and the arc path forming portions 100, 200, 300 will be described in separate sections.

[0065] The arc path forming units 100, 200, 300 according to various embodiments described below will be described on the assumption that they are provided in a DC relay 1. However, it will be understood that the arc path forming units 100, 200, 300 can be applied to devices that can connect and disconnect electricity to and from the outside by contacting and separating fixed contacts and movable contacts, such as electromagnetic contactors and electromagnetic switches.

[0066] (1) Description of frame section 10 The frame 10 forms the exterior of the DC relay 1. A predetermined space is formed inside the frame 10. Various devices that perform the function of applying or cutting off a current transmitted from the outside to the DC relay 1 can be accommodated in the space. That is, the frame 10 functions as a kind of housing 41.

[0067] In one embodiment, the frame portion 10 is formed of an insulating material such as synthetic resin, and can prevent arbitrary electrical conduction between the inside and outside of the frame portion 10.

[0068] 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.

[0069] The upper frame 11 forms the upper side of the frame portion 10. Inside the upper frame 11, a predetermined space is formed.

[0070] The internal space of the upper frame 11 can accommodate the opening / closing portion 20 and the movable contact portion 40. The internal space of the upper frame 11 can also accommodate the arc path forming portions 100, 200, 300.

[0071] A fixed contact 22 of the opening / closing unit 20 is located on one side of the upper frame 11, which is the upper side in the illustrated embodiment. A portion of the fixed contact 22 is exposed to the upper side of the upper frame 11 and can be electrically connected to an external power source or load. To this end, a through hole through which the fixed contact 22 passes and is coupled may be formed on one side of the upper frame 11.

[0072] The lower frame 12 forms the lower side of the frame section 10. A predetermined space is formed inside the lower frame 12. The core section 30 can be housed in the internal space of the lower frame 12.

[0073] The lower frame 12 can be coupled to the upper frame 11. In the space between the lower frame 12 and the upper frame 11, an insulating plate 13 and a supporting plate 14 can be provided.

[0074] The insulating plate 13 is located between the upper frame 11 and the lower frame 12 .

[0075] The insulating plate 13 electrically isolates the upper frame 11 from the lower frame 12. For this reason, the insulating plate 13 is preferably made of an insulating material such as synthetic resin.

[0076] The insulating plate 13 makes it possible to prevent arbitrary electrical current flow between the switching section 20, movable contact section 40 and arc path forming sections 100, 200, 300 housed inside the upper frame 11 and the core section 30 housed inside the lower frame 12.

[0077] A through hole (not shown) is formed in the center of the insulating plate 13. The shaft 44 of the movable contact portion 40 is connected to the through hole so as to be movable in the vertical direction.

[0078] Below the insulating plate 13, a support plate 14 is located.

[0079] The support plate 14 supports the underside of the insulating plate 13 .

[0080] The support plate 14 is located between the upper frame 11 and the lower frame 12 .

[0081] The support plate 14 physically separates the upper frame 11 and the lower frame 12 .

[0082] The support plate 14 may be made of a magnetic material. Therefore, the support plate 14 can form a magnetic circuit together with the yoke 33. The magnetic circuit can generate a driving force for moving the movable core 32 of the core unit 30 toward the fixed core 31.

[0083] A through hole (not shown) is formed in the center of the support plate 14. A shaft 44 is connected to the through hole so as to be movable in the up and down directions.

[0084] Therefore, when the movable core 32 moves in a direction toward the fixed core 31 or away from the fixed core 31, the shaft 44 and the movable contact 43 connected to the shaft 44 can also move together in the same direction.

[0085] (2) Description of opening / closing section 20 The opening / closing unit 20 allows or blocks the passage of electric current by the operation of the core unit 30. Specifically, the opening / closing unit 20 allows or blocks the passage of electric current by bringing the fixed contact 22 and the movable contact 43 into contact with or away from each other.

[0086] The opening / closing section 20 is housed in the internal space of the upper frame 11. The opening / closing section 20 can be electrically and physically isolated from the core section 30 by the insulating plate 13 and the support plate 14.

[0087] In the illustrated embodiment, the switch 20 includes an arc chamber 21 , a fixed contact 22 and a seal member 23 .

[0088] The arc chamber 21 extinguishes, in its internal space, an arc that occurs when the fixed contact 22 and the movable contact 43 are separated from each other. For this reason, the arc chamber 21 is also called an "arc extinguishing section."

[0089] The arc chamber 21 hermetically houses the fixed contact 22 and the movable contact 43. That is, the fixed contact 22 and the movable contact 43 are housed inside the arc chamber 21. Therefore, an arc generated when the fixed contact 22 and the movable contact 43 are separated from each other does not flow out arbitrarily.

[0090] The inside of the arc chamber 21 can be filled with an arc-extinguishing gas. The arc-extinguishing gas can extinguish the generated arc and be discharged to the outside of the DC relay 1 via a predetermined path. For this purpose, a communication hole (not shown) can be formed penetrating the wall surrounding the internal space of the arc chamber 21.

[0091] In one embodiment, the arc chamber 21 may be made of an insulating material. In another embodiment, the arc chamber 21 may be made of a material having high pressure resistance and high heat resistance. This is because the generated arc is a flow of electrons at high temperature and pressure. For example, the arc chamber 21 may be made of a ceramic material.

[0092] A plurality of through holes may be formed on the upper side of the arc chamber 21. Fixed contacts 22 are connected to the respective through holes.

[0093] In the illustrated embodiment, the fixed contacts 22 are provided in two pieces, including a first fixed contact 22a and a second fixed contact 22b. As a result, the through hole formed on the upper side of the arc chamber 21 may also be formed in two pieces.

[0094] When the fixed contact 22 is connected to the through hole, the through hole is sealed. That is, the fixed contact 22 is hermetically connected to the through hole. This prevents the generated arc from being discharged to the outside through the through hole.

[0095] The lower side of arc chamber 21 may be open. Insulating plate 13 and sealing member 23 are in contact with the lower side of arc chamber 21. That is, the lower side of arc chamber 21 is sealed by insulating plate 13 and sealing member 23.

[0096] Thereby, the arc chamber 21 may be electrically and physically separated from the outer space of the upper frame 11 .

[0097] The arc extinguished in the arc chamber 21 is discharged through a predetermined path to the outside of the DC relay 1. In one embodiment, the extinguished arc can be discharged to the outside of the arc chamber 21 through the communication hole.

[0098] Arc path forming parts 100, 200, 300 may be provided outside the arc chamber 21. The arc path forming parts 100, 200, 300 may form a magnetic field for forming a path AP of the arc generated inside the arc chamber 21. This will be described in detail later.

[0099] The fixed contact 22 applies or cuts off current between the inside and outside of the DC relay 1 by coming into contact with or separating from the movable contact 43 .

[0100] Specifically, when the fixed contact 22 comes into contact with the movable contact 43, electricity can flow between the inside and outside of the DC relay 1. On the other hand, when the fixed contact 22 is separated from the movable contact 43, electricity between the inside and outside of the DC relay 1 is cut off.

[0101] As the name suggests, the fixed contact 22 does not move. That is, the fixed contact 22 is fixedly coupled to the upper frame 11 and the arc chamber 21. Therefore, contact and separation between the fixed contact 22 and the movable contact 43 is achieved by the movement of the movable contact 43.

[0102] One end of the fixed contact 22, which in the illustrated embodiment is an upper end, is exposed to the outside of the upper frame 11. A power source or a load is electrically connected to the one end.

[0103] There may be provided a plurality of fixed contacts 22. In the illustrated embodiment, the fixed contacts 22 include a first fixed contact 22a on the left side and a second fixed contact 22b on the right side, and two fixed contacts in total are provided.

[0104] The first fixed contact 22a is positioned on one side of the center of the length of the movable contact 43, that is, offset to the left in the illustrated embodiment. The second fixed contact 22b is positioned on the other side of the center of the length of the movable contact 43, that is, offset to the right in the illustrated embodiment.

[0105] A power source may be electrically connected to one of the first fixed contact 22a and the second fixed contact 22b, and a load may be electrically connected to the other of the first fixed contact 22a and the second fixed contact 22b.

[0106] The DC relay 1 according to the embodiment of the present invention can form an arc path AP regardless of the direction of the power source or load connected to the fixed contact 22. This is achieved by the arc path forming units 100, 200, and 300, which will be described in detail later.

[0107] The other end of the fixed contact 22 , which in the illustrated embodiment is the lower end, extends toward the movable contact 43 .

[0108] When the movable contact 43 moves in a direction toward the fixed contact 22, that is, upward in the illustrated embodiment, the lower end portion comes into contact with the movable contact 43. This allows electrical current to flow between the outside and the inside of the DC relay 1.

[0109] The lower end of the fixed contact 22 is located inside the arc chamber 21 .

[0110] When the control power supply is cut off, the movable contact 43 is separated from the fixed contact 22 by the elastic force of the return spring 36 .

[0111] At this time, as the fixed contact 22 and the movable contact 43 move away from each other, 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 can be discharged to the outside along the path formed by the arc path forming parts 100, 200, and 300.

[0112] The seal member 23 blocks any communication between the arc chamber 21 and the space inside the upper frame 11 .

[0113] The seal member 23, together with the insulating plate 13 and the support plate 14, seals the lower side of the arc chamber 21. Specifically, the upper side of the seal member 23 is joined to the lower side of the arc chamber 21. Moreover, the radially inner side of the seal member 23 is joined to the outer periphery of the insulating plate 13, and the lower side of the seal member 23 is joined to the support plate 14.

[0114] Therefore, the arc generated in the arc chamber 21 and the arc extinguished by the arc-extinguishing gas do not flow arbitrarily into the internal space of the upper frame 11 .

[0115] Furthermore, the seal member 23 may be configured to block any communication between the internal space of the cylinder 37 and the internal space of the frame portion 10 .

[0116] (3) Description of core unit 30 When the control power supply is applied, the core portion 30 moves the movable contact portion 40 upward. When the control power supply is removed, the core portion 30 moves the movable contact portion 40 downward again.

[0117] The core unit 30 is electrically connected to an external control power source (not shown) so that a control power source can be applied thereto.

[0118] The core unit 30 is located below the opening / closing unit 20. The core unit 30 is housed inside the lower frame 12. The core unit 30 and the opening / closing unit 20 can be electrically and physically separated from each other by the insulating plate 13 and the support plate 14.

[0119] The movable contact portion 40 is located between the core portion 30 and the opening / closing portion 20. The movable contact portion 40 can be moved by a driving force applied by the core portion 30. This causes the movable contact 43 and the fixed contact 22 to come into contact with each other, and the DC relay 1 can be energized.

[0120] In the illustrated embodiment, 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 .

[0121] The fixed core 31 is magnetized by the magnetic field generated by the coil 35, and generates an electromagnetic repulsive force. The electromagnetic repulsive force causes the movable core 32 to move in a direction away from the fixed core 31.

[0122] The fixed core 31 does not move, i.e., the fixed core 31 is fixedly connected to the support plate 14 and the cylinder 37.

[0123] The fixed core 31 may be provided in any form that can be magnetized by a magnetic field to generate an electromagnetic force. In one embodiment, the fixed core 31 may be provided as a permanent magnet or an electromagnet.

[0124] The fixed core 31 partially accommodates the lower side of the cylinder 37. In addition, the inner periphery of the fixed core 31 contacts the outer periphery of the cylinder 37.

[0125] A through hole (not shown) is formed in the center of the fixed core 31. A shaft 44 is connected to the through hole so as to be vertically movable.

[0126] When the control power is applied, the movable core 32 moves in a direction away from the fixed core 31 due to the electromagnetic repulsive force generated by the fixed core 31 .

[0127] Due to the movement of the movable core 32, the shaft 44 coupled to the movable core 32 moves in a direction away from the fixed core 31, that is, upward in the illustrated embodiment. In addition, as the shaft 44 moves, the movable contact portion 40 coupled to the shaft 44 also moves upward.

[0128] This brings the fixed contact 22 and the movable contact 43 into contact with each other, allowing the DC relay 1 to be electrically connected to an external power source or load.

[0129] The movable core 32 may be provided in any form capable of receiving a repulsive force due to an electromagnetic force. In one embodiment, the movable core 32 may be formed of a magnetic material, or may be provided as a permanent magnet, an electromagnet, or the like.

[0130] The movable core 32 is housed inside the cylinder 37. The movable core 32 can move inside the cylinder 37 in the length direction of the cylinder 37, and in the vertical direction in the illustrated embodiment.

[0131] Specifically, the movable core 32 can move in a direction toward the fixed core 31 and a direction away from the fixed core 31 .

[0132] 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. This causes the movable contactor 43 to also move upward or downward.

[0133] The movable core 32 is located above the fixed core 31. The movable core 32 may be spaced a predetermined distance from the fixed core 31. The predetermined distance may be defined as a distance that the movable core 32 can move in the vertical direction.

[0134] The movable core 32 extends in the length direction. A hollow portion extending in the length direction is recessed at a predetermined distance inside the movable core 32. The return spring 36 and the lower side of the shaft 44 that is connected to the return spring 36 are partially housed in the hollow portion.

[0135] A through hole is formed in the lower part of the hollow part in the length direction. The hollow part and the through hole communicate with each other. The lower end of the shaft 44 inserted in the hollow part can advance toward the through hole.

[0136] A space is recessed at a predetermined distance in the lower end of the movable core 32. The space communicates with the through hole. A lower head portion of a shaft 44 is positioned in the space.

[0137] The yoke 33 creates a magnetic path as a control power supply is applied to the yoke 33. The magnetic path created by the yoke 33 may be configured to adjust the direction of the magnetic field created by the coil 35.

[0138] This allows the coil 35 to generate a magnetic field such that the movable core 32 moves in a direction away from the fixed core 31 when the control power is applied.

[0139] In one embodiment, the yoke 33 may be formed from a conductive material that can carry electricity.

[0140] The yoke 33 is housed inside the lower frame 12. The yoke 33 surrounds the coil 35. The coil 35 may be housed inside the yoke 33 so as to be spaced a predetermined distance from the inner circumferential surface of the yoke 33. The bobbin 34 is housed inside the yoke 33. That is, the yoke 33, the coil 35, and the bobbin 34 around which the coil 35 is wound are arranged in this order in a direction from the outer periphery of the lower frame 12 toward the radially inward direction.

[0141] The upper side of the yoke 33 contacts the support plate 14. In addition, the outer periphery of the yoke 33 may be in contact with the inner periphery of the lower frame 12, or may be located so as to be spaced a predetermined distance from the inner periphery of the lower frame 12.

[0142] A coil 35 is wound around the bobbin 34 .

[0143] The bobbin 34 is housed inside the yoke 33 .

[0144] The bobbin 34 may include flat upper and lower portions and a cylindrical post extending in the length direction and connecting the upper and lower portions, i.e., the bobbin 34 is in the shape of a bobbin.

[0145] The top of the bobbin 34 contacts the underside of the support plate 14. A coil 35 is wound around the column of the bobbin 34. The thickness around which the coil 35 is wound may be configured to be the same as or smaller than the diameter of the top and bottom of the bobbin 34.

[0146] A hollow portion extending in the length direction is formed through the column portion of the bobbin 34. The hollow portion can accommodate a cylinder 37. The column portion of the bobbin 34 may be arranged to have a central axis like the fixed core 31, the movable core 32, and the shaft 44.

[0147] The coil 35 generates a magnetic field when a control power supply is applied. The fixed core 31 is magnetized by the magnetic field generated by the coil 35, and an electromagnetic repulsive force can be applied to the movable core 32.

[0148] The coil 35 is wound around the bobbin 34. Specifically, the coil 35 is wound around a pillar portion of the bobbin 34 and laminated radially outwardly of the pillar portion. The coil 35 is housed inside the yoke 33.

[0149] 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 may be magnetized by the magnetic field generated by the coil 35.

[0150] When the fixed core 31 is magnetized, the movable core 32 receives an electromagnetic force in a direction away from the fixed core 31, i.e., a repulsive force. This causes the movable core 32 to move in a direction toward the fixed core 31, that is, upward in the illustrated embodiment.

[0151] The return spring 36 provides a restoring force for returning the movable core 32 to its original position when the application of the control power supply is released after the movable core 32 has moved in a direction away from the fixed core 31.

[0152] The return spring 36 is compressed and memorizes a restoring force as the movable core 32 moves toward the fixed core 31. At this time, it is preferable that the memorized restoring force is smaller than the electromagnetic repulsive force that is exerted on the movable core 32 when the fixed core 31 is magnetized. This is to prevent the movable core 32 from being arbitrarily returned to its original position by the return spring 36 while the control power supply is applied.

[0153] When the application of the control power supply is released, the movable core 32 receives a restoring force from the return spring 36. Of course, gravity due to the empty weight of the movable core 32 can also act on the movable core 32. This causes the movable core 32 to move away from the fixed core 31, and return to the original position.

[0154] The return spring 36 may be provided in any form capable of storing a restoring force when the shape is deformed, returning to the original shape, and transmitting the restoring force to the outside. In one embodiment, the return spring 36 may be provided as a coil 35 spring.

[0155] A shaft 44 is connected to the return spring 36. With the return spring 36 connected to the shaft 44, the shaft 44 can move up and down regardless of the deformation of the return spring 36.

[0156] The return spring 36 is housed in a hollow portion recessed in the upper side of the movable core 32 .

[0157] The cylinder 37 accommodates the movable core 32, the return spring 36, and the shaft 44. The movable core 32 and the shaft 44 can move upward and downward from the inside of the cylinder 37.

[0158] The cylinder 37 is located in a hollow portion formed in the column portion of the bobbin 34. The side surface of the cylinder 37 contacts the inner circumferential surface of the column portion of the bobbin 34.

[0159] The upper end of the cylinder 37 contacts the lower surface of the support plate 14 .

[0160] The lower surface of the cylinder 37 can come into contact with the fixed core 31 .

[0161] (4) Description of the movable contact portion 40 The movable contact portion 40 includes a movable contactor 43 and a configuration for moving the movable contactor 43. The movable contact portion 40 enables the DC relay 1 to be electrically connected to an external power source or a load.

[0162] The movable contact portion 40 is housed in the internal space of the upper frame 11. Moreover, the movable contact portion 40 is housed inside the arc chamber 21 so as to be vertically movable.

[0163] The fixed contact 22 is located above the movable contact portion 40. The movable contact portion 40 is accommodated inside the arc chamber 21 so as to be movable toward the fixed contact 22 and away from the fixed contact 22.

[0164] The core portion 30 is located below the movable contact portion 40. The movement of the movable contact portion 40 can be achieved by the movement of the movable core 32.

[0165] In the illustrated embodiment, the movable contact portion 40 includes a housing 41 , a cover 42 , a movable contact 43 , a shaft 44 and an elastic portion 45 .

[0166] The housing 41 accommodates the movable contact 43 and an elastic portion 45 that elastically supports the movable contact 43 .

[0167] In the illustrated embodiment, the housing 41 has one side and the opposite side open. The movable contact 43 may be inserted into the open portion. The non-open side of the housing 41 may be configured to surround the housed movable contact 43.

[0168] A cover 42 is provided on the upper side of the housing 41 .

[0169] The cover 42 covers the upper surface of the movable contact 43 accommodated in the housing 41 .

[0170] The housing 41 and the cover 42 are preferably made of an insulating material to prevent unintentional electrical conduction. In one embodiment, the housing 41 and the cover 42 may be made of a synthetic resin or the like.

[0171] The lower side of the housing 41 is connected to the shaft 44. When the movable core 32 connected to the shaft 44 moves upward or downward, the housing 41 and the movable contactor 43 accommodated therein can also move upward or downward.

[0172] The housing 41 and the cover 42 can be connected by any member. In one embodiment, the housing 41 and the cover 42 can be connected by fastening members (not shown) such as bolts and nuts.

[0173] When the control power supply is applied, the movable contact 43 comes into contact with the fixed contact 22, and electrically connects the DC relay 1 to the external power supply and the load. When the control power supply is removed, the movable contact 43 separates from the fixed contact 22, and does not electrically connect the DC relay 1 to the external power supply and the load.

[0174] The movable contact 43 is located adjacent to the fixed contact 22 .

[0175] The upper side of the movable contact 43 is partially covered by the cover 42. In one embodiment, a portion of the upper surface of the movable contact 43 can contact the lower surface of the cover 42.

[0176] The lower side of the movable contact 43 is elastically supported by the elastic portion 45. The elastic portion 45 can elastically support the movable contact 43 in a state compressed at a predetermined distance so that the movable contact 43 does not arbitrarily move downward.

[0177] The movable contactor 43 extends in the length direction, which is the left-right direction in the illustrated embodiment. That is, the length of the movable contactor 43 is longer than the width. Therefore, both ends of the movable contactor 43 in the length direction housed in the housing 41 are exposed to the outside of the housing 41.

[0178] Contact protrusions may be formed to protrude upward from both ends by a predetermined distance. The fixed contacts 22 come into contact with the contact protrusions.

[0179] The contact protrusions may be formed at positions corresponding to the fixed contacts 22. This reduces the moving distance of the movable contact 43, and improves the contact reliability between the fixed contacts 22 and the movable contact 43.

[0180] The width of the movable contactor 43 may be the same as the distance between the side surfaces of the housing 41. That is, when the movable contactor 43 is accommodated in the housing 41, both side surfaces in the width direction of the movable contactor 43 may be in contact with the inner surfaces of the side surfaces of the housing 41. This allows the movable contactor 43 to be stably maintained in a state where it is accommodated in the housing 41.

[0181] The shaft 44 transmits a driving force generated as the core portion 30 operates to the movable contact portion 40. Specifically, the shaft 44 is connected to the movable core 32 and the movable contact 43. When the movable core 32 moves upward or downward, the shaft 44 allows the movable contact 43 to also move upward or downward.

[0182] The shaft 44 extends in a longitudinal direction, that is, in the vertical direction in the illustrated embodiment.

[0183] The lower end of the shaft 44 is inserted into and coupled to the movable core 32. When the movable core 32 moves up and down, the shaft 44 can move up and down together with the movable core 32.

[0184] The return spring 36 is connected through the body portion of the shaft 44 .

[0185] An upper end 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.

[0186] The upper and lower ends of the shaft 44 may be formed to have a larger diameter than the body of the shaft 44. This allows the shaft 44 to maintain a stable connection with the housing 41 and the movable core 32.

[0187] 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 an electromagnetic repulsive force. At this time, the elastic portion 45 elastically supports the movable contact 43 and prevents the movable contact 43 from moving away from the fixed contact 22 arbitrarily.

[0188] The elastic portion 45 may be provided in any form capable of storing a restoring force by deformation of the shape and providing the stored restoring force to another member. In one embodiment, the elastic portion 45 may be provided by a coil spring 35.

[0189] One end of the elastic portion 45 facing the movable contact 43 comes into contact with the lower side of the movable contact 43. The other end opposite to the one end comes into contact with the upper side of the housing 41.

[0190] The elastic portion 45 can elastically support the movable contact 43 in a state where it is compressed by a predetermined distance and stores a restoring force. This prevents the movable contact 43 from moving arbitrarily even if an electromagnetic repulsive force is generated between the movable contact 43 and the fixed contact 22.

[0191] For stable coupling of the elastic portion 45, a protrusion (not shown) to be inserted into the elastic portion 45 may be formed on the lower side of the movable contact 43. Similarly, a protrusion (not shown) to be inserted into the elastic portion 45 may be formed on the upper side of the housing 41.

[0192] 2. Description of the arc path forming unit 100 according to one embodiment of the present invention An arc path forming part 100 according to an embodiment of the present invention will be described below with reference to FIGS.

[0193] The arc path forming part 100 forms a magnetic field inside the arc chamber 21. An electromagnetic force is generated inside the arc chamber 21 by the current flowing through the DC relay 1 and the formed magnetic field.

[0194] As the fixed contact 22 and the movable contact 43 move away from each other, the generated arc moves to the outside of the arc chamber 21 due to the generated electromagnetic force. Specifically, the generated arc moves along the direction of the generated electromagnetic force. As a result, it can be said that the arc path forming part 100 forms an arc path AP, which is a path along which the generated arc flows.

[0195] The arc path forming part 100 is located in a space formed inside the upper frame 11. The arc path forming part 100 is disposed so as to surround the arc chamber 21. That is, the arc chamber 21 is located inside the arc path forming part 100.

[0196] The fixed contact 22 and the movable contact 43 are located inside the arc path forming part 100. An arc generated when the fixed contact 22 and the movable contact 43 are separated from each other can be induced by the electromagnetic force generated by the arc path forming part 100.

[0197] The arc path forming portion 100 according to this embodiment includes a magnet holder portion 110 and a magnet portion 120 .

[0198] The magnet holder portion 110 forms the framework of the arc path forming portion 100 , and fixes the magnet portion 120 , which will be described later, to the outside of the arc chamber 21 .

[0199] The magnet holder part 110 is disposed outside the arc chamber 21 and inside the upper frame 11 .

[0200] The fixed contact 22 and the movable contact 43 are located radially inward of the magnet holder part 110. The central portions of the fixed contact 22 and the movable contact 43 can be defined as a center part C. In the illustrated embodiment, the magnet holder part 110 is disposed such that its center corresponds to the center part C of the fixed contact 22 and the movable contact 43.

[0201] The center portion C is located between the first fixed contact 22a and the second fixed contact 22b. Moreover, the center portion of the movable contact portion 40 is located vertically below the center portion C. In other words, the centers of the housing 41, the cover 42, the movable contact 43, the shaft 44, the elastic portion 45, etc. are located vertically below the center portion C.

[0202] Therefore, when the generated arc moves toward the center C, the above-mentioned components may be damaged. To prevent this, the arc path forming unit 100 according to the present embodiment includes a magnet unit 120. A detailed description of this will be given later together with a description of the magnet unit 120.

[0203] In one embodiment, the magnet holder portion 110 may be made of an electrically conductive material. In the embodiment, the magnet holder portion 110 may be magnetized with the same polarity as the adjacent magnets.

[0204] The magnet holder unit 110 may include a plurality of holders. Each holder may be coupled with a plurality of magnets. In one embodiment, the magnets attached to one holder are all magnetized with the same polarity.

[0205] In the illustrated embodiment, the magnet holder portion 110 includes a total of two holders, such as a first holder 111 and a second holder 112 .

[0206] The first holder 111 and the second holder 112 are spaced apart from each other. That is, an empty space is formed between the first holder 111 and the second holder 112. The space can function as a passage through which the arc generated in the arc chamber 21 is exhausted.

[0207] Moreover, the first holder 111 and the second holder 112 are arranged in a direction intersecting the arrangement direction of the multiple fixed contacts 22.

[0208] The first holder 111 and the second holder 112 are each bent at a predetermined angle and extend. The bent portions of the first holder 111 and the second holder 112 may have tapered corners. In one embodiment, the predetermined angle may be a right angle.

[0209] The first holder 111 and the second holder 112 may be in contact with or fixedly coupled to an inner circumferential surface of the upper frame 11. Accordingly, it is preferable that the first holder 111 and the second holder 112 are formed in a shape corresponding to the inner circumferential surface of the upper frame 11.

[0210] The first holder 111 and the second holder 112 are arranged such that the concave portions of the bent portions face each other with the center C of the fixed contact 22 and the movable contact 43 interposed therebetween.

[0211] In addition, the first holder 111 and the second holder 112 are formed to have shapes corresponding to each other. In the illustrated embodiment, the first holder 111 and the second holder 112 are formed to have a structure that is symmetrical to each other with respect to the center C of the multiple fixed contacts 22 and the movable contact 43.

[0212] The first holder 111 includes a first outer surface 111a and a first inner surface 111b.

[0213] The first outer side surface 111a is located on one side of the first holder 111 opposite to the fixed contact 22 and the movable contact 43. In addition, the first outer side surface 111a and the inner peripheral surface of the upper frame 11 are disposed adjacent to each other. In one embodiment, the first outer side surface 111a is formed into a shape corresponding to the inner peripheral surface of the upper frame 11.

[0214] The first inner side surface 111b is located on the other side opposite to the first outer side surface 111a of the first holder 111. The first inner side surface 111b is disposed opposite to the outer peripheral surface of the arc chamber 21 with the first magnet 121 and the second magnet 122 sandwiched therebetween. In one embodiment, the first inner side surface 111b is formed into a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0215] The first inner surface 111b is coupled to a first magnet 121 and a second magnet 122 of the magnet section 120, which will be described later.

[0216] The second holder 112 includes a second outer surface 112a and a second inner surface 112b.

[0217] The second outer side surface 112a is located on one side of the second holder 112 opposite to the fixed contact 22 and the movable contact 43. In addition, the second outer side surface 112a and the inner circumferential surface of the upper frame 11 are disposed adjacent to each other. In one embodiment, the second outer side surface 112a is formed into a shape corresponding to the inner circumferential surface of the upper frame 11.

[0218] The second inner side surface 112b is located on the other side opposite to the second outer side surface 112a of the second holder 112. The second inner side surface 112b is disposed opposite to the outer circumferential surface of the arc chamber 21 with the third magnet 123 and the fourth magnet 124 interposed therebetween. In one embodiment, the second inner side surface 112b is formed into a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0219] The second inner surface 112b is coupled to a third magnet 123 and a fourth magnet 124 of the magnet section 120, which will be described later.

[0220] The magnet section 120 forms a magnetic field inside the arc chamber 21 in which the fixed contact 22 and the movable contact 43 are housed. The fixed contact 22 and the movable contact 43 are located radially inward of the magnet section 120. In the illustrated embodiment, the magnet section 120 is disposed such that its center corresponds to the center C of the fixed contact 22 and the movable contact 43.

[0221] The magnet sections 120 can generate a magnetic field by themselves and between each other. The magnetic field generated by the magnet sections 120 generates an electromagnetic force together with the current flowing through the fixed contact 22 and the movable contact 43. The generated electromagnetic force induces an arc that occurs when the fixed contact 22 and the movable contact 43 are separated from each other.

[0222] At this time, the arc path forming portion 100 generates an electromagnetic force in a direction away from the center C of the fixed contact 22 and the movable contact 43. As a result, an arc path AP is also formed in a direction away from the center C of the fixed contact 22 and the movable contact 43.

[0223] As a result, the components provided in the DC relay 1 are not damaged by the generated arc. Furthermore, the generated arc can be quickly discharged to the outside of the arc chamber 21.

[0224] The magnet portion 120 is coupled to the inner surfaces 111b, 112b of the magnet holder portion 110. In one embodiment, a fastener (not shown) may be provided to couple the magnet portion 120 to the inner surfaces 111b, 112b of the magnet holder portion 110.

[0225] The magnet section 120 may include a plurality of magnets.

[0226] In this embodiment, the magnet section 120 includes a total of four magnets, such as a first magnet 121, a second magnet 122, a third magnet 123, and a fourth magnet 124.

[0227] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may be provided in any form that can be magnetized and form a magnetic field inside the arc chamber 21. Furthermore, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all formed to have polarity in the width direction.

[0228] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are disposed apart from one another. That is, an empty space is formed between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124. In addition, the space between the first magnet 121 and the fourth magnet 124 or the space between the second magnet 122 and the third magnet 123 can function as a passage through which the arc generated in the arc chamber 21 is discharged.

[0229] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may be in contact with or fixedly coupled to the outer circumferential surface of the arc chamber 21. Thus, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are preferably formed in a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0230] In one embodiment, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may be formed in shapes that correspond to one another. Specifically, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may be formed in shapes whose widths and width-direction lengths correspond to one another.

[0231] The first magnet 121 is coupled to the first inner side surface 111b of the first holder 111. The first magnet 121 extends along the first inner side surface 111b from one end of the first holder 111. In one embodiment, the first magnet 121 is formed in a shape corresponding to the first inner side surface 111b of the first holder 111.

[0232] The first magnet 121 includes a first opposing surface 121a and a first opposite surface 121b.

[0233] The first opposing surface 121a is located on one side of the first magnet 121 facing the center C of the fixed contact 22 and the movable contact 43. The first opposing surface 121a is disposed adjacent to the outer circumferential surface of the arc chamber 21. In one embodiment, the first opposing surface 121a is formed into a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0234] The first opposite surface 121b is located on the other surface opposite to the first opposing surface 121a of the first magnet 121. The first opposite surface 121b is disposed opposite to the inner peripheral surface of the upper frame 11 across the first holder 111. In one embodiment, the first opposite surface 121b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0235] The second magnet 122 is coupled to the first inner side surface 111b of the first holder 111. The second magnet 122 also extends along the first inner side surface 111b from the other end of the first holder 111 opposite the first magnet 121. In one embodiment, the second magnet 122 is formed in a shape corresponding to the first inner side surface 111b of the first holder 111.

[0236] The extension direction of the second magnet 122 intersects with the extension direction of the first magnet 121. This is because the first holder 111 coupled to the first magnet 121 and the second magnet 122 is bent at a predetermined angle and extends.

[0237] The second magnet 122 includes a second opposing surface 122a and a second opposing surface 122b.

[0238] The second opposing surface 122a is located on one side of the second magnet 122 facing the center C of the fixed contact 22 and the movable contact 43. The second opposing surface 122a is disposed adjacent to the outer circumferential surface of the arc chamber 21. In one embodiment, the second opposing surface 122a is formed into a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0239] The second opposite surface 122b is located on the other surface opposite to the second opposing surface 122a of the second magnet 122. In addition, the second opposite surface 122b is disposed opposite to the inner peripheral surface of the upper frame 11 across the first holder 111. In one embodiment, the second opposite surface 122b is formed into a shape corresponding to the inner peripheral surface of the upper frame 11.

[0240] The third magnet 123 is coupled to the second inner side surface 112b of the second holder 112. The third magnet 123 extends from one end of the second holder 112 along the second inner side surface 112b. In one embodiment, the third magnet 123 is formed in a shape corresponding to the second inner side surface 112b of the second holder 112. In the illustrated embodiment, the third magnet 123 extends in a direction aligned with the extension direction of the first magnet 121.

[0241] The third magnet 123 is disposed opposite the first magnet 121 across the center C of the fixed contact 22 and the movable contact 43. That is, the first magnet 121, the center C, and the third magnet 123 are arranged side by side along a predetermined direction.

[0242] The third magnet 123 is disposed opposite to the second magnet 122 across an imaginary line extending along the arrangement direction of the multiple fixed contacts 22.

[0243] The third magnet 123 includes a third opposing surface 123a and a third opposing surface 123b.

[0244] The third opposing surface 123a is located on one side of the third magnet 123 facing the center C of the fixed contact 22 and the movable contact 43. The third opposing surface 123a is disposed adjacent to the outer circumferential surface of the arc chamber 21. In one embodiment, the third opposing surface 123a is formed in a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0245] The third opposite surface 123b is located on the other surface opposite to the third opposing surface 123a of the third magnet 123. The third opposite surface 123b is disposed opposite to the inner circumferential surface of the upper frame 11 across the second holder 112. In one embodiment, the third opposite surface 123b is formed in a shape corresponding to the inner circumferential surface of the upper frame 11.

[0246] The fourth magnet 124 is coupled to the second inner side surface 112b of the second holder 112. The fourth magnet 124 also extends along the second inner side surface 112b from the other end of the second holder 112 opposite the third magnet 123. In one embodiment, the fourth magnet 124 is formed in a shape corresponding to the second inner side surface 112b of the second holder 112. In the illustrated embodiment, the fourth magnet 124 extends in a direction aligned with the extension direction of the second magnet 122.

[0247] The extension direction of the fourth magnet 124 intersects with the extension direction of the third magnet 123. This is because the second holder 112 coupled to the third magnet 123 and the fourth magnet 124 is bent at a predetermined angle and extends.

[0248] The fourth magnet 124 is disposed opposite the first magnet 121 across an imaginary line extending along the arrangement direction of the plurality of fixed contacts 22. In one embodiment, the shortest distance between the fourth magnet 124 and the first magnet 121 is the same as the shortest distance between the second magnet 122 and the third magnet 123.

[0249] The fourth magnet 124 is disposed facing the second magnet 122 across the center C of the fixed contact 22 and the movable contact 43. That is, the second magnet 122, the center C, and the fourth magnet 124 are arranged side by side along a predetermined direction. The predetermined direction intersects with the arrangement direction of the first magnet 121, the center C, and the third magnet 123.

[0250] The fourth magnet 124 includes a fourth opposing surface 124a and a fourth opposing surface 124b.

[0251] The fourth opposing surface 124a is located on one side of the fourth magnet 124 facing the center C of the fixed contact 22 and the movable contact 43. The fourth opposing surface 124a is disposed adjacent to the outer circumferential surface of the arc chamber 21. In one embodiment, the fourth opposing surface 124a is formed in a shape corresponding to the outer circumferential surface of the arc chamber 21.

[0252] The fourth opposite surface 124b is located on the other surface opposite to the fourth opposing surface 124a of the fourth magnet 124. In addition, the fourth opposite surface 124b is disposed opposite to the inner peripheral surface of the upper frame 11 across the second holder 112. In one embodiment, the fourth opposite surface 124b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0253] The opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized with the same polarity. The opposing surfaces 121b, 122b, 123b, and 124b of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are magnetized with polarities opposite to each other, and similarly, all of them are magnetized with the same polarity.

[0254] In one embodiment, the shortest distances from each opposing surface 121a, 122a, 123a, 124a of the first magnet 121, the second magnet 122, the third magnet 123 and the fourth magnet 124 to the center C of the fixed contact 22 and the movable contact 43 may all be formed to be the same.

[0255] 3 to 5, the opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized with N poles, and the opposing surfaces 121b, 122b, 123b, and 124b are all magnetized with S poles. This creates a magnetic field between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 in a direction that pushes them out towards each other.

[0256] The first holder 111 and the second holder 112 are also magnetized together by the magnet portion 120 to form an associated magnetic field.

[0257] In the embodiment shown in FIG. 4, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0258] When Fleming's rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the right, and therefore the arc path AP near the first fixed contact 22a is also directed downward to the right.

[0259] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0260] In the embodiment shown in FIG. 5, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0261] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is directed downward to the left.

[0262] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0263] 6 to 8, the opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized with S poles, and the opposing surfaces 121b, 122b, 123b, and 124b are all magnetized with N poles. This creates a magnetic field between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 in a direction that pushes them out towards each other.

[0264] The first holder 111 and the second holder 112 are also magnetized together by the magnet portion 120 to form an associated magnetic field.

[0265] In the embodiment shown in FIG. 7, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0266] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is also directed downward to the left.

[0267] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0268] In the embodiment shown in FIG. 8, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0269] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the right. As a result, the arc path AP near the first fixed contact 22a is directed downward to the right.

[0270] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0271] Therefore, the arc path forming unit 100 according to this embodiment can form an electromagnetic force and an arc path AP in a direction away from the center C regardless of the polarity of the magnet unit 120 or the direction of the current flowing through the DC relay.

[0272] This makes it possible to prevent damage to the components of the DC relay 1 arranged adjacent to the center C. Furthermore, the generated arc can be quickly discharged to the outside, improving the operational reliability of the DC relay 1.

[0273] 3. Description of arc path forming unit 200 according to another embodiment of the present invention An arc path forming unit 200 according to another embodiment of the present invention will be described below with reference to FIGS.

[0274] The arc path forming portion 200 according to this embodiment includes a magnet holder portion 210 , a magnet portion 220 and an auxiliary magnet 230 .

[0275] The magnet holder part 210 and the magnet part 220 according to this embodiment have the same structure and function as the magnet holder part 110 and the magnet part 120 according to the previously described embodiment. However, the arc path forming part 200 according to this embodiment differs from the arc path forming part 100 according to the previously described embodiment in that an auxiliary magnet 230 is provided.

[0276] Accordingly, the description of the magnet holder section 210 and the magnet section 220 will be replaced with the description of the magnet holder section 110 and the magnet section 120 according to the above embodiment, and the description will focus mainly on the auxiliary magnet 230.

[0277] The auxiliary magnet 230 forms a magnetic field inside the arc chamber 21 in which the fixed contact 22 and the movable contact 43 are housed.

[0278] The auxiliary magnet 230 is located radially inward of the magnet holder portion 210. That is, the auxiliary magnet 230 is located between the first holder 211 and the second holder 212.

[0279] The auxiliary magnet 230 overlaps with the center points C of the fixed contact 22 and the movable contact 43 in the direction of movement of the movable contact 43. In the illustrated embodiment, the auxiliary magnet 230 is disposed such that its center corresponds to the center points C of the fixed contact 22 and the movable contact 43.

[0280] The auxiliary magnet 230 can form a magnetic field by itself and in relation to the magnet section 220. The magnetic field formed by the auxiliary magnet 230 generates an electromagnetic force together with the current flowing through the fixed contact 22 and the movable contact 43. The generated electromagnetic force induces an arc that is generated when the fixed contact 22 and the movable contact 43 are separated from each other.

[0281] The auxiliary magnet 230 extends in a direction parallel to the arrangement direction of the first holder 211 and the second holder 212.

[0282] In one embodiment, the shortest distances from the opposing surfaces 221a, 222a, 223a, 224a of the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 to the center of the auxiliary magnet 230 may all be formed to be the same.

[0283] In the illustrated embodiment, the auxiliary magnets 230 are formed with widthwise polarity.

[0284] The auxiliary magnet 230 includes a first surface 231 and a second surface 232 .

[0285] The first surface 231 is located on one side of the auxiliary magnet 230 facing the first magnet 221 and the fourth magnet 224. The second surface 232 is located on the other side of the auxiliary magnet 230 opposite to the first surface 231. It can be seen that the first surface 231 and the second surface 232 are formed on different surfaces of one auxiliary magnet 230 and are magnetized with opposite polarities.

[0286] 9 to 11, the opposing surfaces 221a, 222a, 223a, 224a of the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 are all magnetized with N poles, and the opposing surfaces 221b, 222b, 223b, 224b are all magnetized with S poles. This creates a magnetic field between the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 in a direction that pushes them out towards each other.

[0287] Also, the first surface 231 of the auxiliary magnet 230 is magnetized with an N pole, and the second surface 232 is magnetized with an S pole. As a result, a magnetic field is formed between the first surface 231 of the auxiliary magnet 230, the first opposing surface 221a of the first magnet 221, and the fourth opposing surface 224a of the fourth magnet 224 in a direction that pushes them outward from each other. Conversely, a magnetic field is formed between the second surface 232 of the auxiliary magnet 230, the second opposing surface 222a of the second magnet 222, and the third opposing surface 223a of the third magnet 223 in a direction from the second opposing surface 222a and the third opposing surface 223a to the second surface 232.

[0288] The first holder 211 and the second holder 212 are also magnetized together by the magnet portion 220 to form an associated magnetic field.

[0289] In the embodiment shown in FIG. 10, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0290] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the right. As a result, the arc path AP near the first fixed contact 22a is also directed downward to the right.

[0291] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0292] In the embodiment shown in FIG. 11, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0293] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is directed downward to the left.

[0294] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the left. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the left.

[0295] 12 to 14, the opposing surfaces 221a, 222a, 223a, 224a of the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 are all magnetized with S poles, and the opposing surfaces 221b, 222b, 223b, 224b are all magnetized with N poles. This creates a magnetic field between the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 in a direction that pushes them out towards each other.

[0296] Also, the first surface 231 of the auxiliary magnet 230 is magnetized with an N pole, and the second surface 232 is magnetized with an S pole. As a result, a magnetic field is formed between the first surface 231 of the auxiliary magnet 230 and the first opposing surface 221a of the first magnet 221 and the fourth opposing surface 224a of the fourth magnet 224, in a direction from the first surface 231 toward the first opposing surface 221a and the fourth opposing surface 224a. Conversely, a magnetic field is formed between the second surface 232 of the auxiliary magnet 230 and the second opposing surface 222a of the second magnet 222 and the third opposing surface 223a of the third magnet 223 in a direction that pushes them out toward each other.

[0297] The first holder 211 and the second holder 212 are also magnetized together by the magnet portion 220 to form an associated magnetic field.

[0298] In the embodiment shown in FIG. 13, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0299] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is also directed downward to the left.

[0300] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the left. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the left.

[0301] In the embodiment shown in FIG. 14, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0302] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is directed downward to the left.

[0303] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0304] Therefore, the arc path forming unit 200 according to this embodiment can form an electromagnetic force and an arc path AP in a direction away from the center C regardless of the polarity of the magnet unit 220 or the direction of the current flowing through the DC relay.

[0305] This makes it possible to prevent damage to the components of the DC relay 1 arranged adjacent to the center C. Furthermore, the generated arc can be quickly discharged to the outside, improving the operational reliability of the DC relay 1.

[0306] 4. Description of arc path forming unit 300 according to still another embodiment of the present invention An arc path forming portion 300 according to still another embodiment of the present invention will be described below with reference to FIGS.

[0307] The arc path forming portion 300 according to this embodiment includes a magnet holder portion 310 , a magnet portion 320 and an auxiliary magnet 330 .

[0308] The magnet holder part 310 and the magnet part 320 according to this embodiment have the same structure and function as the magnet holder part 210 and the magnet part 220 according to the previous embodiment. However, the auxiliary magnet 330 according to this embodiment differs from the auxiliary magnet 230 according to the previous embodiment in that the extension direction of the auxiliary magnet 330 intersects with the arrangement direction of the first holder 311 and the second holder 312.

[0309] Accordingly, the explanation regarding the magnet holder portion 310 and the magnet portion 320 will be replaced with the explanation regarding the magnet holder portion 210 and the magnet portion 220 according to the previous embodiment, and the explanation regarding the auxiliary magnet 330 will focus on the differences from the auxiliary magnet 230 according to the previous embodiment.

[0310] The auxiliary magnet 330 according to this embodiment is located radially inward of the magnet holder part 310. That is, the auxiliary magnet 330 is located between the first holder 311 and the second holder 312. In this case, the auxiliary magnet 330 extends in a direction intersecting with the arrangement direction of the first holder 311 and the second holder 312.

[0311] In the illustrated embodiment, the auxiliary magnets 330 are formed with widthwise polarity.

[0312] The auxiliary magnet 330 includes a first surface 331 and a second surface 332 .

[0313] The first surface 331 is located on one side of the auxiliary magnet 330 facing the first magnet 321 and the second magnet 322. The second surface 332 is located on the other side of the auxiliary magnet 330 opposite the first surface 331. It can be seen that the first surface 331 and the second surface 332 are formed on different sides of one auxiliary magnet 330 and are magnetized with opposite polarities.

[0314] 15 to 17, the opposing surfaces 321a, 322a, 323a, 324a of the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 are all magnetized with N poles, and the opposing surfaces 321b, 322b, 323b, 324b are all magnetized with S poles. As a result, a magnetic field is formed between the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 in a direction that pushes them out toward each other.

[0315] Also, the first surface 331 of the auxiliary magnet 330 is magnetized with an N pole, and the second surface 332 is magnetized with an S pole. As a result, a magnetic field in a direction pushing each other out is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322. Conversely, a magnetic field in a direction from the third opposing surface 323a and the fourth opposing surface 324a of the fourth magnet 324 to the second surface 332 is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324.

[0316] The first holder 311 and the second holder 312 are also magnetized together by the magnet portion 320 to form an associated magnetic field.

[0317] In the embodiment shown in FIG. 16, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0318] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the right. As a result, the arc path AP near the first fixed contact 22a is also directed downward to the right.

[0319] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0320] In the embodiment shown in FIG. 17, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0321] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is directed downward to the left.

[0322] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the left. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0323] 18 to 20, the opposing surfaces 321a, 322a, 323a, 324a of the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 are all magnetized with S poles, and the opposing surfaces 321b, 322b, 323b, 324b are all magnetized with N poles. This creates a magnetic field between the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 in a direction that pushes them out towards each other.

[0324] Also, the first surface 331 of the auxiliary magnet 330 is magnetized with an N pole, and the second surface 332 is magnetized with an S pole. As a result, a magnetic field is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322, in a direction from the first surface 331 toward the first opposing surface 321a and the second opposing surface 322a. Conversely, a magnetic field is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324 in a direction that pushes them out toward each other.

[0325] The first holder 311 and the second holder 312 are also magnetized together by the magnet portion 320 to form an associated magnetic field.

[0326] In the embodiment shown in FIG. 19, the direction of current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0327] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the left. As a result, the arc path AP near the first fixed contact 22a is also directed downward to the left.

[0328] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0329] In the embodiment shown in FIG. 20, the direction of current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0330] When Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is directed downward to the right. As a result, the arc path AP near the first fixed contact 22a is directed downward to the right.

[0331] Similarly, when Fleming's left-hand rule is applied in consideration of the direction of the current and the direction of the magnetic field in the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is directed upward and to the right. As a result, the arc path AP near the second fixed contact 22b is also directed upward and to the right.

[0332] Therefore, the arc path forming unit 300 according to this embodiment can form an electromagnetic force and an arc path AP in a direction away from the center C regardless of the polarity of the magnet unit 320 or the direction of the current flowing through the DC relay.

[0333] This makes it possible to prevent damage to the components of the DC relay 1 arranged adjacent to the center C. Furthermore, the generated arc can be quickly discharged to the outside, improving the operational reliability of the DC relay 1.

[0334] Although the present invention has been described above with reference to the preferred embodiments, the present invention is not limited to the configurations of the embodiments described above.

[0335] Furthermore, the present invention can be modified and changed in various ways by those having ordinary knowledge in the technical field to which the present invention pertains, without departing from the spirit and scope of the present invention as described in the claims.

[0336] Furthermore, the above-described embodiments can be configured by selectively combining all or part of each embodiment so that various modifications can be made. [Explanation of symbols]

[0337] 1 DC Relay 10 Frame section 11 Upper frame 12 Lower Frame 13 Insulation plate 14 Support plate 20 Opening and closing section 21 Arc Chamber 22 Fixed contact 22a 1st fixed contact 22b 2nd fixed contact 30 Core 31 Fixed Core 32 Movable Core 33 York 34 Bobbin 35 Coil 36 Return spring 37 Cylinder 40 Movable contact part 41 Housing 42 Cover 43 Movable contact 44 Shaft 45 Elastic part 100 An embodiment of the arc path forming portion 110 Magnet holder part 111 First Holder 111a 1st outer surface 111b 1st inner surface 112 Second Holder 112a 2nd outer surface 112b Second inner surface 120 Magnet section 121 First Magnet 121a 1st facing surface 121b 1st opposite side 122 Second Magnet 122a Second facing surface 122b 2nd opposite side 123 Third Magnet 123a Third opposing surface 123b 3rd opposite side 124 4th Magnet 124a 4th facing surface 124b 4th opposite side 200 Other embodiments of the arc path forming portion 210 Magnet holder part 211 First Holder 211a 1st outer surface 211b 1st inner surface 212 Second Holder 212a 2nd outer surface 212b 2nd inner surface 220 Magnet section 221 First Magnet 221a 1st facing surface 221b 1st opposite side 222 Second Magnet 222a 2nd facing surface 222b 2nd opposite side 223 Third Magnet 223a 3rd facing surface 223b 3rd opposite side 224 4th Magnet 224a 4th facing surface 224b 4th opposite side 230 Auxiliary Magnet 231 Page 1 232 2nd page 300 Yet another embodiment of the arc path forming portion 310 Magnet holder part 311 First Holder 311a 1st outer surface 311b 1st inner surface 312 Second Holder 312a 2nd outer surface 312b 2nd inner surface 320 Magnet section 321 First Magnet 321a 1st facing surface 321b 1st opposite side 322 Second Magnet 322a 2nd facing surface 322b 2nd opposite side 323 Third Magnet 323a 3rd facing surface 323b 3rd opposite side 324 4th Magnet 324a 4th facing surface 324b 4th opposite side 330 Auxiliary Magnet 331 Page 1 332 2nd page AP Arc Path

Claims

1. an arc chamber having a plurality of fixed contacts and a movable contact housed therein; a magnet holder portion disposed outside the arc chamber and including a first holder and a second holder that are different from each other; and a magnet part attached to a surface of the magnet holder part facing the arc chamber and forming a magnetic field in the arc chamber; The first holder and the second holder include: each of the first and second holders is bent at a predetermined angle and extends, is spaced apart from one another and arranged in a direction intersecting the arrangement direction of the plurality of fixed contacts, and each of the recesses is arranged opposite to one another and is arranged in a manner surrounding the plurality of fixed contacts, but by being spaced apart, is arranged so as not to cover a portion where the arrangement direction of the first holder and the second holder intersects with the arrangement direction of the plurality of fixed contacts, The magnet portion is a first magnet and a second magnet disposed adjacent to a surface of the first holder facing the arc chamber and extending from one end or the other end of the first holder along the surface of the first holder; and a third magnet and a fourth magnet are disposed adjacent to a surface of the second holder facing the arc chamber and extend from one end or the other end of the second holder along the surface of the second holder; The arc path forming portion, wherein the first magnet, the second magnet, the third magnet and the fourth magnet are all magnetized with the same polarity.

2. The magnet portion is The arc path forming portion according to claim 1 , wherein the first magnet and the third magnet are disposed opposite each other, and the second magnet and the fourth magnet are disposed opposite each other.

3. The first magnet is The third magnet extends in a direction parallel to the extending direction of the third magnet. The second magnet is The arc path forming portion according to claim 2 , which extends in a direction aligned with an extension direction of the fourth magnet.

4. The first magnet and the second magnet are The arc path forming portion according to claim 3 , wherein the respective extension directions intersect with each other.

5. The first magnet is the fourth magnet and the fixed contacts are disposed opposite each other across a virtual line extending along an arrangement direction of the fourth magnet and the fixed contacts, The second magnet is The arc path forming portion according to claim 2 , wherein the arc path forming portion and the third magnet are disposed opposite each other with the imaginary line interposed therebetween.

6. The magnet portion is The arc path forming portion according to claim 5 , wherein a shortest distance between the first magnet and the fourth magnet is formed to be the same as a shortest distance between the second magnet and the third magnet.

7. The arc path forming portion according to claim 1 , further comprising an auxiliary magnet overlapping a center point of the plurality of fixed contacts in a moving direction of the movable contact and forming a magnetic field in the arc chamber.

8. The auxiliary magnet is The arc path forming portion according to claim 7 , wherein the extension direction is formed parallel to the arrangement direction of the first holder and the second holder.

9. The auxiliary magnet is The arc path forming portion according to claim 7 , wherein the extending direction intersects with the arrangement direction of the first holder and the second holder.

10. The first magnet, the second magnet, the third magnet, and the fourth magnet are The arc path forming portion according to claim 1 , wherein the width direction and the length in the width direction correspond to each other.

11. The first holder is The arc path forming part according to claim 1 , wherein the arc path forming part is formed to have a shape corresponding to that of the second holder and is symmetrical to the second holder with respect to a center point of the plurality of fixed contacts.

12. a plurality of fixed contacts provided and positioned spaced apart from each other in one direction; a movable contact that comes into contact with and separates from the fixed contact; an arc chamber in which a space is formed in which the fixed contact and the movable contact are housed; a frame surrounding the arc chamber; a magnet holder portion disposed between the outside of the arc chamber and the inside of the frame, the magnet holder portion including a first holder and a second holder that are different from each other; and a magnet part attached to a surface of the magnet holder part facing the arc chamber and forming a magnetic field in the arc chamber; The first holder and the second holder include: each of the first and second holders is bent at a predetermined angle and extends, is spaced apart from one another and arranged in a direction intersecting the arrangement direction of the fixed contacts, and each of the recesses is arranged opposite to one another and is arranged in a manner surrounding the plurality of fixed contacts, but by being spaced apart, is arranged so as not to cover a portion where the arrangement direction of the first holder and the second holder intersects with the arrangement direction of the plurality of fixed contacts, The magnet portion is a first magnet and a second magnet disposed adjacent to a surface of the first holder facing the arc chamber and extending from one end or the other end of the first holder along the surface of the first holder; and a third magnet and a fourth magnet are disposed adjacent to a surface of the second holder facing the arc chamber and extend from one end or the other end of the second holder along the surface of the second holder; A DC relay, wherein the first magnet, the second magnet, the third magnet and the fourth magnet are all magnetized with the same polarity.

13. The magnet portion is 13. The DC relay of claim 12, wherein the first magnet and the third magnet are disposed opposite each other, and the second magnet and the fourth magnet are disposed opposite each other.

14. The first magnet is The third magnet extends in a direction parallel to the extending direction of the third magnet. The second magnet is The DC relay according to claim 13 , wherein the fourth magnet extends in a direction parallel to the extension direction of the first magnet, and the extension direction of the fourth magnet intersects with the extension direction of the first magnet.

15. The first magnet is the fourth magnet and the fixed contacts are disposed opposite each other across a virtual line extending along an arrangement direction of the fourth magnet and the fixed contacts, The second magnet is The DC relay according to claim 12 , wherein the first magnet and the second magnet are disposed opposite each other with the imaginary line interposed therebetween.

16. 13. The DC relay according to claim 12, further comprising an auxiliary magnet overlapping a center point of the plurality of fixed contacts in a direction of movement of the movable contact and forming a magnetic field in the arc chamber.

17. The auxiliary magnet is 17. The DC relay according to claim 16, wherein the extension direction is formed parallel to the arrangement direction of the first holder and the second holder.

18. The auxiliary magnet is 17. The DC relay according to claim 16, wherein the extension direction intersects with the arrangement direction of the first holder and the second holder.

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