Arc path forming section and DC relay including the 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 specifically, to an arc path forming part capable of effectively guiding the generated arc outward and a DC relay including the same.

Background Art

[0002] A direct current relay means a device that uses the principle of an electromagnet to transmit mechanical drive or current signals. A direct current relay is also called a magnetic switch and is generally classified as an electrical circuit opening and closing device.

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

[0004] The conduction through the DC relay is allowed or blocked by the contact and separation of the fixed contact and the movable contact. The movement is achieved by a drive unit that applies a driving force to the movable contact.

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

[0006] The arc discharge path is formed by a magnet provided in the DC relay. The magnet forms a magnetic field inside the space where the fixed contact and the movable contact come into contact. The arc discharge path can be formed by the formed magnetic field and the electromagnetic force generated by the flow of current.

[0007] In a conventional DC relay, the electromagnetic force acting on some fixed contacts is formed inward, that is, toward the central portion of the movable contact. Therefore, the arc generated at that position is not immediately discharged to the outside.

[0008] In the central portion of the DC relay, that is, in the space between each fixed contact, various members for driving the movable contact in the vertical direction are provided. As an example, a shaft, a spring member inserted through the shaft, etc. are provided at the said position.

[0009] Therefore, when the generated arc moves toward the central portion, and also when the arc that has moved to the central portion does not immediately move to the outside, the various members provided at the said position may be damaged by the energy of the arc.

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

[0011] That is, the user has to consider the direction of the current every time the DC relay is used. This can cause inconvenience in using the DC relay. Also, a situation where the direction of the current applied to the DC relay changes due to inappropriate operations or the like, regardless of the user's intention, cannot be excluded.

[0012] In this case, the members provided in the central portion of the DC relay may be damaged by the generated arc. As a result, not only does the service life of the DC relay decrease, but there is also a risk of safety accidents.

[0013] Korean Registered Patent Publication No. 10-1696952 discloses a DC relay. Specifically, it discloses a DC relay having a structure that can prevent the movement of a movable contact using a plurality of permanent magnets.

[0014] By the way, such a type of DC relay can prevent the movement of the movable contact by using a plurality of permanent magnets, but there is a limit in that there is no consideration for a solution to control the direction of the arc discharge path.

[0015] Korean Registered Patent Publication No. 10-1216824 discloses a DC relay. Specifically, it discloses a DC relay having a structure capable of preventing any separation between a movable contact and a fixed contact by using a damping magnet.

[0016] However, such a type of DC relay only presents a solution for maintaining the contact state between the movable contact and the fixed contact. That is, there is a limit in that it does not present a solution for forming an arc discharge path that occurs when the movable contact and the fixed contact are separated.

Prior Art Documents

Patent Documents

[0017]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0018] One object of the present invention is to provide an arc path forming part capable of quickly extinguishing and discharging an arc generated when the energized 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 strengthening the magnitude of the force for inducing the generated arc, and a DC relay including the same.

[0020] Still another object of the present invention is to provide an arc path forming portion capable of preventing damage to components for energization by an arc generated, and a DC relay including the same.

[0021] Still another object of the present invention is to provide an arc path forming portion capable of allowing arcs generated at a plurality of positions to proceed without meeting each other, and a DC relay including the same.

[0022] Still another object of the present invention is to provide an arc path forming portion capable of achieving the above-described objects without significant design changes, and a DC relay including the same.

Means for Solving the Problems

[0023] To achieve the above object, an arc path forming portion according to an embodiment of the present invention includes: an arc chamber in which a plurality of fixed contacts and movable contacts are accommodated; a magnet holder portion disposed outside the arc chamber and including a first holder and a second holder different from each other; and a magnet portion attached to one surface of the magnet holder portion facing the arc chamber to form a magnetic field in the arc chamber. The first holder and the second holder are each bent and extended at a predetermined angle, arranged apart from each other and in a direction intersecting with the arrangement direction of the plurality of fixed contacts, with respective recesses facing each other. The magnet portion is disposed adjacent to one surface of the first holder facing the arc chamber, and includes a first magnet and a second magnet extending along the one surface of the first holder from one end or the other end of the first holder. The magnet portion is also disposed adjacent to one surface of the second holder facing the arc chamber, and includes a third magnet and a fourth magnet extending along the one surface of the second holder from one end facing the second magnet or the other end facing the first magnet of the second holder. The first magnet and the second magnet are arranged so as to be displaced without facing the third magnet and the fourth magnet with respect to the center point of the plurality of fixed contacts.

[0024] Further, the shortest path between the first magnet and the third magnet may overlap with the center point of the plurality of fixed contacts and the moving direction of the movable contact, and the shortest path between the second magnet and the fourth magnet may overlap with the center point of the plurality of fixed contacts and the moving direction of the movable contact.

[0025] Further, 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.

[0026] Further, the extension directions of the first magnet and the second magnet may intersect each other.

[0027] Further, the first magnet may be arranged so as not to face each other and to be displaced with respect to each other across an imaginary line connecting the center point of the plurality of fixed contacts and the recesses of the first holder and the second holder, and the third magnet may be arranged so as not to face each other and to be displaced with respect to each other across the imaginary line.

[0028] Further, the shortest distance between the first magnet and the second magnet in the magnet portion may be formed to be the same as the shortest distance between the third magnet and the fourth magnet.

[0029] Further, the first magnet may be arranged to face each other across an imaginary line connecting the center point of the plurality of fixed contacts and the recesses of the first holder and the second holder, and the third magnet may be arranged to face each other across the imaginary line. Further, the shortest distance between the first magnet and the second magnet in the magnet portion may be formed to be the same as the shortest distance between the third magnet and the fourth magnet.

[0030] Further, the first magnet, the second magnet, the third magnet, and the fourth magnet can all be magnetized with the same polarity.

[0031] Further, the first magnet and the second magnet can be magnetized with one of the polarities of the N pole and the S pole, and the third magnet and the fourth magnet can be magnetized with the other one of the polarities of the N pole and the S pole.

[0032] Also, an arc path forming portion according to another embodiment of the present invention includes an arc chamber in which a plurality of fixed contacts and movable contacts are accommodated; a magnet holder portion disposed outside the arc chamber and including a first holder and a second holder different from each other; and a magnet portion attached to one surface of the magnet holder portion facing the arc chamber and forming a magnetic field in the arc chamber. The first holder and the second holder are each bent and extended at a predetermined angle, arranged apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, with their respective recesses facing each other. The magnet portion is disposed adjacent to one surface of the first holder facing the arc chamber, and includes a first magnet and a second magnet extending along the one surface of the first holder from one end or the other end of the first holder. And a third magnet and a fourth magnet disposed adjacent to one surface of the second holder facing the arc chamber and extending along the one surface of the second holder from one end facing the second magnet or the other end facing the first magnet. At least two of the first magnet, the second magnet, the third magnet, and the fourth magnet are formed with different sizes from each other.

[0033] Also, the first magnet and the third magnet may be formed with different sizes from each other, and the second magnet and the fourth magnet may also be formed with different sizes from each other.

[0034] Also, the first magnet and the second magnet may be formed with a first length in the longitudinal direction, and the third magnet and the fourth magnet may be formed with a second length in the longitudinal direction.

[0035] Further, the first magnet is arranged to face each other across a virtual line connecting the second magnet, the center point of the plurality of fixed contacts, and the recesses of the first holder and the second holder, and the third magnet may be arranged to face each other across the virtual line with the fourth magnet.

[0036] Further, the first magnet and the second magnet may be formed in different sizes from each other, and the third magnet and the fourth magnet may also be formed in different sizes from each other.

[0037] Further, the first magnet and the third magnet may be formed with a first length in the longitudinal direction, and the second magnet and the fourth magnet may be formed with a second length in the longitudinal direction.

[0038] Further, the first magnet may be symmetric with the third magnet with respect to the center point of the plurality of fixed contacts, and the second magnet may be symmetric with the fourth magnet with respect to the center point of the plurality of fixed contacts.

[0039] Further, the first magnet may be formed with a first length in the longitudinal direction, and the second magnet, the third magnet, and the fourth magnet may be formed with a second length in the longitudinal direction.

[0040] Further, the second magnet may be symmetric with the fourth magnet with respect to the center point of the plurality of fixed contacts.

[0041] Further, the third magnet may be arranged to face each other across a virtual line connecting the fourth magnet, the center point of the plurality of fixed contacts, and the recesses of the first holder and the second holder.

[0042] Further, the first magnet, the second magnet, the third magnet, and the fourth magnet can all be magnetized with the same polarity.

[0043] Further, the first magnet and the second magnet can be magnetized with one of the polarities of N pole and S pole, and the third magnet and the fourth magnet can be magnetized with the other one of the polarities of N pole and S pole.

[0044] The present invention also provides an embodiment of a DC relay, including: a plurality of fixed contacts provided and spaced apart from each other in one direction; a movable contact that contacts or separates from the fixed contact; an arc chamber in which a space for accommodating the fixed contact and the movable contact is formed; a frame surrounding the arc chamber; a magnet holder portion disposed between the outside of the arc chamber and the inside of the frame and including a first holder and a second holder different from each other; and a magnet portion attached to a surface of the magnet holder portion facing the arc chamber to form a magnetic field in the arc chamber. The first holder and the second holder are each bent and extended at a predetermined angle, arranged spaced apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, with their respective recesses arranged to face each other. The magnet portion is disposed adjacent to a surface of the first holder facing the arc chamber, and includes a first magnet and a second magnet extending along the surface of the first holder from one end or the other end of the first holder. The magnet portion is also disposed adjacent to a surface of the second holder facing the arc chamber, and includes a third magnet and a fourth magnet extending along the surface of the second holder from one end facing the second magnet or the other end facing the first magnet of the second holder. The first magnet and the second magnet are arranged so as to be offset from the third magnet and the fourth magnet respectively without facing each other with reference to the center points of the plurality of fixed contacts.

[0045] Further, 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 the extension direction thereof may intersect with the extension direction of the first magnet.

[0046] Further, the first magnet is arranged so as to be displaced without facing each other across an imaginary line connecting the second magnet, the center points of the plurality of fixed contacts, and the recesses of the first and second holders, and the third magnet may be arranged so as to be displaced without facing each other across the imaginary line with the fourth magnet.

[0047] Further, the first magnet may be arranged to face each other across an imaginary line connecting the second magnet, the center points of the plurality of fixed contacts, and the recesses of the first and second holders, and the third magnet may be arranged to face each other across the imaginary line with the fourth magnet.

[0048] Also, a DC relay according to another embodiment of the present invention includes a plurality of fixed contacts provided and spaced apart from each other in one direction; a movable contact that contacts or separates from the fixed contacts; an arc chamber in which a space for accommodating the fixed contacts and the movable contact is formed; a frame surrounding the arc chamber; a magnet holder portion disposed between the outside of the arc chamber and the inside of the frame and including first and second holders different from each other; and a magnet portion attached to one surface of the magnet holder portion facing the arc chamber and forming a magnetic field in the arc chamber. The first and second holders are each bent and extended at a predetermined angle, arranged to be spaced apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, with their respective recesses facing each other. The magnet portion is disposed adjacent to one surface of the first holder facing the arc chamber, and includes a first magnet and a second magnet extending along the one surface of the first holder from one end or the other end of the first holder. And a third magnet and a fourth magnet disposed adjacent to one surface of the second holder facing the arc chamber and extending along the one surface of the second holder from one end facing the second magnet or the other end facing the first magnet of the second holder. At least two of the first magnet, the second magnet, the third magnet, and the fourth magnet are formed in different sizes from each other.

[0049] Further, the first magnet and the second magnet are arranged to face each other with a virtual line connecting the center points of the plurality of fixed contacts and the recesses of the first holder and the second holder interposed therebetween, and are formed with a first length in the longitudinal direction. The third magnet and the fourth magnet may be arranged to face each other with the virtual line interposed therebetween, and may be formed with a second length in the longitudinal direction.

[0050] Further, the first magnet is symmetric with the third magnet with respect to the center point of the plurality of fixed contacts, and the second magnet is symmetric with the fourth magnet with respect to the center point of the plurality of fixed contacts. The first magnet and the third magnet may be formed with a first length in the longitudinal direction, and the second magnet and the fourth magnet may be formed with a second length in the longitudinal direction.

[0051] Further, the first magnet may be formed with a first length in the longitudinal direction, and the second magnet, the third magnet, and the fourth magnet may be formed with a second length in the longitudinal direction.

Advantages of the Invention

[0052] Among various advantages of the present invention, the advantages that can be obtained by the above-described solution means are as follows.

[0053] First, the arc path forming portion includes a magnet portion. Each magnet portion forms a magnetic field inside the arc path forming portion. The formed magnetic field forms an electromagnetic force together with the current passed through the fixed contact and the movable contact accommodated in the arc path forming portion.

[0054] At this time, the generated arc is formed in a direction away from each fixed contact. The arc generated when the fixed contact and the movable contact are separated can be induced by the electromagnetic force.

[0055] Therefore, the generated arc can be quickly extinguished and discharged outside the arc path forming portion and the DC relay.

[0056] In addition, the magnet part may be provided with a plurality of magnets. The plurality of magnets are formed so as to strengthen the strength of the electromagnetic force formed near each fixed contact. That is, by mutually different magnets, the arc path forming parts formed near the same fixed contact are formed in the same direction as each other.

[0057] Therefore, it is possible to strengthen the strength of the magnetic field formed near each fixed contact and the strength of the electromagnetic force depending on the strength of the magnetic field. As a result, it is possible to strengthen the strength of the electromagnetic force that induces the generated arc, and effectively extinguish and discharge the generated arc.

[0058] Also, the direction of the magnetic field formed by the magnet part and the electromagnetic force formed by the current flowing through the fixed contact and the movable contact is formed in a direction away from the central part.

[0059] Furthermore, as described above, since the strength of the magnetic field and the electromagnetic force are strengthened by the magnet part, the generated arc can be quickly extinguished and moved in a direction away from the central part.

[0060] Therefore, it is possible to prevent damage to various components provided near the central part for the operation of the DC relay.

[0061] In addition, in various embodiments, a plurality of fixed contacts may be provided. The magnet part provided in the arc path forming part forms magnetic fields in mutually different directions near each fixed contact. Therefore, the paths of the arcs generated near each fixed contact proceed in mutually different directions.

[0062] Therefore, the arcs generated near each fixed contact do not meet each other. Thereby, it is possible to prevent malfunction or safety accidents that may occur due to the collision of arcs generated at mutually different positions.

[0063] Also, the magnet part and the magnet holder part are located inside the frame surrounding the arc chamber. That is, the magnet part and the magnet holder part are located between the inside of the frame and the outside of the arc chamber.

[0064] Therefore, no separate design change is required to arrange the magnet part and the magnet holder part outside the arc chamber.

[0065] Therefore, the arc path forming part according to various embodiments of the present invention can be provided in the DC relay without significant design changes. Furthermore, time, costs, etc. for applying the arc path forming part according to various embodiments of the present invention can be reduced.

Brief Description of the Drawings

[0066]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

Figure 31

Figure 32

Figure 33

Figure 34

Figure 35

Figure 36

Figure 37

Figure 38

Figure 39

Figure 40

Figure 41

Embodiments for Carrying Out the Invention

[0067] Hereinafter, the arc path forming portions 100, 200, 300, 400 according to the embodiments of the present invention and the DC relay 1 including the same will be described in more detail with reference to the drawings.

[0068] In the following description, in order to clarify the features of the present invention, the description of some components may be omitted.

[0069] In this specification, even in different embodiments, the same reference numerals are given to the same configurations, and repeated descriptions thereof are omitted.

[0070] The accompanying drawings are only for facilitating the understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings.

[0071] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0072] 1. Description of the DC relay 1 according to the embodiment of the present invention Hereinafter, the DC relay 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

[0073] The DC relay 1 according to an embodiment of the present invention includes a frame portion 10, an opening / closing portion 20, a core portion 30, and a movable contact portion 40. The DC relay 1 also includes arc path forming portions 100, 200, 300, and 400.

[0074] The arc path forming portions 100, 200, 300, and 400 can form a discharge path for the generated arc.

[0075] Hereinafter, with reference to the accompanying drawings, the configuration of the DC relay 1 according to an embodiment of the present invention will be described. 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, and 400 will be described in separate sections.

[0076] The arc path forming portions 100, 200, 300, and 400 according to various embodiments described below are described on the premise that they are provided in the DC relay 1. However, it can be understood that the arc path forming portions 100, 200, 300, and 400 can be applied to devices in a form that can be energized and de-energized to the outside by contact and separation of fixed contacts and movable contacts, such as electromagnetic contactors and electromagnetic switches.

[0077] (1) Description of the frame portion 10 The frame portion 10 forms the outside of the DC relay 1. A predetermined space is formed inside the frame portion 10. Various devices that perform functions for applying or interrupting the current transmitted from the outside to the DC relay 1 can be accommodated in the space. That is, the frame portion 10 functions as a kind of housing 41.

[0078] In one embodiment, the frame portion 10 is formed of an insulating material such as synthetic resin, and it is possible to prevent the inside and outside of the frame portion 10 from being arbitrarily energized.

[0079] 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.

[0080] The upper frame 11 forms the upper side of the frame part 10. A predetermined space is formed inside the upper frame 11.

[0081] The opening / closing part 20 and the movable contact part 40 can be accommodated in the internal space of the upper frame 11. Also, the arc path forming parts 100, 200, 300, 400 can be accommodated in the internal space of the upper frame 11.

[0082] On one side of the upper frame 11, in the illustrated embodiment, on the upper side, the fixed contact 22 of the opening / closing part 20 is located. A part of the fixed contact 22 is exposed on the upper side of the upper frame 11 and can be connected to an external power source or load so as to be energizable. For this purpose, a through hole through which the fixed contact 22 penetrates and is coupled can be formed on one side of the upper frame 11.

[0083] The lower frame 12 forms the lower side of the frame part 10. A predetermined space is formed inside the lower frame 12. The core part 30 can be accommodated in the internal space of the lower frame 12.

[0084] The lower frame 12 can be coupled to the upper frame 11. An insulating plate 13 and a support plate 14 can be provided in the space between the lower frame 12 and the upper frame 11.

[0085] The insulating plate 13 is located between the upper frame 11 and the lower frame 12.

[0086] The insulating plate 13 electrically isolates the upper frame 11 and the lower frame 12. For this purpose, the insulating plate 13 is preferably formed of an insulating material such as synthetic resin.

[0087] The insulating plate 13 can prevent any energization between the opening / closing part 20, the movable contact part 40, and the arc path forming parts 100, 200, 300, 400 accommodated inside the upper frame 11 and the core part 30 accommodated inside the lower frame 12.

[0088] A through hole (not shown) is formed in the central portion of the insulating plate 13. A shaft 44 of the movable contact portion 40 is penetrated and coupled in the vertical direction through the through hole.

[0089] A support plate 14 is located below the insulating plate 13.

[0090] The support plate 14 supports the lower side of the insulating plate 13.

[0091] The support plate 14 is located between the upper frame 11 and the lower frame 12.

[0092] The support plate 14 physically separates the upper frame 11 and the lower frame 12.

[0093] The support plate 14 may be formed of a magnetic material. Therefore, the support plate 14 can form a magnetic circuit together with the yoke 33. By the magnetic circuit, a driving force for moving the movable core 32 of the core portion 30 toward the fixed core 31 can be formed.

[0094] A through hole (not shown) is formed in the central portion of the support plate 14. The shaft 44 is penetrated and coupled in the vertical direction through the through hole.

[0095] Therefore, when the movable core 32 moves in the direction toward the fixed core 31 or in the direction 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.

[0096] (2) Description of the opening / closing portion 20 The opening and closing portion 20 permits or interrupts the energization of an electric current by the operation of the core portion 30. Specifically, the opening and closing portion 20 can permit or interrupt the energization of an electric current by the contact or separation of the fixed contact 22 and the movable contact 43.

[0097] The opening / closing part 20 is accommodated in the internal space of the upper frame 11. The opening / closing part 20 can be electrically and physically separated from the core part 30 by the insulating plate 13 and the support plate 14.

[0098] In the illustrated embodiment, the opening / closing part 20 includes an arc chamber 21, a fixed contact 22, and a seal member 23.

[0099] The arc chamber 21 extinguishes the arc generated when the fixed contact 22 and the movable contact 43 are separated in the internal space. Therefore, the arc chamber 21 is also referred to as an "arc extinguishing part".

[0100] The arc chamber 21 hermetically accommodates the fixed contact 22 and the movable contact 43. That is, the fixed contact 22 and the movable contact 43 are accommodated inside the arc chamber 21. Therefore, the arc generated when the fixed contact 22 and the movable contact 43 are separated does not flow out arbitrarily to the outside.

[0101] The inside of the arc chamber 21 can be filled with arc extinguishing gas. The arc extinguishing gas enables the generated arc to be extinguished and discharged to the outside of the DC relay 1 through a predetermined path. For this purpose, communication holes (not shown) can be formed through the wall surrounding the internal space of the arc chamber 21.

[0102] In one embodiment, the arc chamber 21 may be formed of an insulating material. In other embodiments, the arc chamber 21 may be formed of a material having high voltage resistance and high heat resistance. This is due to the fact that the generated arc is a flow of electrons at high temperature and high pressure. For example, the arc chamber 21 may be formed of a ceramic material.

[0103] A plurality of through holes can be formed on the upper side of the arc chamber 21. The fixed contact 22 is penetrated and coupled to each of the through holes.

[0104] In the illustrated embodiment, two fixed contacts 22 are provided and include a first fixed contact 22a and a second fixed contact 22b. Accordingly, two through holes formed above the arc chamber 21 may also be formed.

[0105] When the fixed contact 22 penetrates and engages with the through hole, the through hole is sealed. That is, the fixed contact 22 is hermetically coupled to the through hole. Accordingly, the generated arc is not discharged to the outside through the through hole.

[0106] The lower side of the arc chamber 21 may be open. The insulating plate 13 and the seal member 23 contact the lower side of the arc chamber 21. That is, the lower side of the arc chamber 21 is sealed by the insulating plate 13 and the seal member 23.

[0107] Accordingly, the arc chamber 21 may be electrically and physically separated from the outer space of the upper frame 11.

[0108] The arc extinguished in the arc chamber 21 is discharged to the outside of the DC relay 1 through a predetermined path. In one embodiment, the extinguished arc can be discharged to the outside of the arc chamber 21 through the communication hole.

[0109] Arc path forming portions 100, 200, 300, and 400 may be provided outside the arc chamber 21. The arc path forming portions 100, 200, 300, and 400 can form a magnetic field for forming the path A.P of the arc generated inside the arc chamber 21. A detailed description thereof will be given later.

[0110] The fixed contact 22 applies or cuts off the energization between the inside and the outside of the DC relay 1 by contacting or separating from the movable contact 43.

[0111] Specifically, when the fixed contact 22 contacts the movable contact 43, the inside and outside of the DC relay 1 can be energized. On the other hand, when the fixed contact 22 is separated from the movable contact 43, the energization between the inside and outside of the DC relay 1 is cut off.

[0112] As can be seen from the name, 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, the contact and separation between the fixed contact 22 and the movable contact 43 are achieved by the movement of the movable contact 43.

[0113] One end of the fixed contact 22, the upper end in the illustrated embodiment, is exposed outside the upper frame 11. A power supply or a load is respectively connectable to the one end so as to be energized.

[0114] A plurality of fixed contacts 22 may be provided. 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 a total of two are provided.

[0115] The first fixed contact 22a is offset from the center in the longitudinal direction of the movable contact 43 to one side, the left side in the illustrated embodiment. Also, the second fixed contact 22b is offset from the center in the longitudinal direction of the movable contact 43 to the other side, the right side in the illustrated embodiment.

[0116] A power supply may be connectable to be energized to either one of the first fixed contact 22a and the second fixed contact 22b. Also, a load may be connectable to be energized to the other one of the first fixed contact 22a and the second fixed contact 22b.

[0117] The DC relay 1 according to the embodiment of the present invention can form the arc path A.P regardless of the direction of the power supply or the load connected to the fixed contact 22. This is achieved by the arc path forming portions 100, 200, 300, 400, and a detailed description thereof will be given later.

[0118] The other end of the fixed contact 22, the lower end in the illustrated embodiment, extends toward the movable contact 43.

[0119] When the movable contact 43 moves upward in the direction toward the fixed contact 22 in the illustrated embodiment, the lower end comes into contact with the movable contact 43. As a result, the exterior and interior of the DC relay 1 can be energized.

[0120] The lower end of the fixed contact 22 is located inside the arc chamber 21.

[0121] 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.

[0122] At this time, as the fixed contact 22 and the movable contact 43 are separated, 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 portions 100, 200, 300, 400.

[0123] The seal member 23 blocks any communication between the arc chamber 21 and the space inside the upper frame 11.

[0124] The seal member 23 seals the lower side of the arc chamber 21 together with the insulating plate 13 and the support plate 14. Specifically, the upper side of the seal member 23 is coupled to the lower side of the arc chamber 21. Also, the radially inner side of the seal member 23 is coupled to the outer periphery of the insulating plate 13, and the lower side of the seal member 23 is coupled to the support plate 14.

[0125] Therefore, the arc generated in the arc chamber 21 and the arc extinguished by the arc extinguishing gas do not arbitrarily flow out into the internal space of the upper frame 11.

[0126] Also, 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.

[0127] (3) Description of the core portion 30 The core part 30 moves the movable contact part 40 upward by applying a control power supply. When the application of the control power supply is released, the core part 30 moves the movable contact part 40 downward again.

[0128] The core part 30 is connected so as to be energizable with an external control power supply (not shown) and can be applied with the control power supply.

[0129] The core part 30 is located below the opening / closing part 20. Further, the core part 30 is housed inside the lower frame 12. The core part 30 and the opening / closing part 20 can be electrically and physically separated by the insulating plate 13 and the support plate 14.

[0130] A movable contact part 40 is located between the core part 30 and the opening / closing part 20. The movable contact part 40 can move by the driving force applied by the core part 30. Thereby, the movable contact 43 and the fixed contact 22 come into contact with each other, and the DC relay 1 can be energized.

[0131] In the illustrated embodiment, the core part 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.

[0132] The fixed core 31 is magnetized by the magnetic field generated by the coil 35 and generates an electromagnetic repulsive force. By the electromagnetic repulsive force, the movable core 32 moves in a direction away from the fixed core 31.

[0133] The fixed core 31 does not move. That is, the fixed core 31 is fixedly coupled to the support plate 14 and the cylinder 37.

[0134] The fixed core 31 may be provided in any form that can be magnetized by a magnetic field and generate an electromagnetic force. In one embodiment, the fixed core 31 may be provided as a permanent magnet, an electromagnet, or the like.

[0135] The fixed core 31 partially accommodates the lower side of the cylinder 37. Also, the inner circumference of the fixed core 31 contacts the outer circumference of the cylinder 37.

[0136] A through hole (not shown) is formed in the central portion of the fixed core 31. A shaft 44 is penetratingly coupled to the through hole so as to be vertically movable.

[0137] When a control power supply is applied, the movable core 32 moves in a direction away from the fixed core 31 by the electromagnetic repulsive force generated by the fixed core 31.

[0138] 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, upward in the illustrated embodiment. Also, as the shaft 44 moves, the movable contact portion 40 coupled to the shaft 44 also moves upward.

[0139] Thereby, the fixed contact 22 and the movable contact 43 come into contact, and the DC relay 1 can be energized with an external power supply or load.

[0140] The movable core 32 may be provided in any form that can receive a repulsive force by electromagnetic force. In one embodiment, the movable core 32 may be formed of a magnetic material, or provided with a permanent magnet or an electromagnet, etc.

[0141] The movable core 32 is accommodated inside the cylinder. Also, the movable core 32 can move in the longitudinal direction of the cylinder 37, vertically in the illustrated embodiment, inside the cylinder 37.

[0142] Specifically, the movable core 32 can move in a direction toward the fixed core 31 and in a direction away from the fixed core 31.

[0143] 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. Accordingly, the movable contact 43 also moves upward or downward.

[0144] The movable core 32 is located above the fixed core 31. The movable core 32 can be separated from the fixed core 31 by a predetermined distance. The predetermined distance can be defined as the distance that the movable core 32 can move in the vertical direction.

[0145] The movable core 32 extends in the longitudinal direction. Inside the movable core 32, a hollow portion extending in the longitudinal direction is recessed by a predetermined distance. The lower side of the shaft 44 that is through-coupled to the return spring 36 and the return spring 36 is partially accommodated in the hollow portion.

[0146] A through-hole is formed to penetrate in the longitudinal direction below the hollow portion. The hollow portion and the through-hole communicate with each other. The lower end portion of the shaft 44 inserted into the hollow portion can proceed toward the through-hole.

[0147] A space portion is recessed by a predetermined distance at the lower end portion of the movable core 32. The space portion communicates with the through-hole. The lower head portion of the shaft 44 is located in the space portion.

[0148] The yoke 33 forms a magnetic path as the control power is applied. The magnetic path formed by the yoke 33 may be configured to adjust the direction of the magnetic field formed by the coil 35.

[0149] Accordingly, when the control power is applied, the coil 35 can generate a magnetic field such that the movable core 32 moves in a direction away from the fixed core 31.

[0150] In one embodiment, the yoke 33 may be formed of an electrically conductive material that can be energized.

[0151] 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 separated from the inner peripheral surface of the yoke 33 by a predetermined distance. A 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 order in a direction radially inward from the outer periphery of the lower frame 12.

[0152] The upper side of the yoke 33 contacts the support plate 14. Also, the outer periphery of the yoke 33 may contact the inner periphery of the lower frame 12 or may be positioned so as to be separated from the inner periphery of the lower frame 12 by a predetermined distance.

[0153] The coil 35 is wound around the bobbin 34.

[0154] The bobbin 34 is housed inside the yoke 33.

[0155] The bobbin 34 may include a flat upper part and a lower part, and a cylindrical column part that extends in the longitudinal direction and connects the upper part and the lower part. That is, the bobbin 34 has a bobbin shape.

[0156] The upper part of the bobbin 34 contacts the lower side of the support plate 14. The coil 35 is wound around the column part of the bobbin 34. The thickness around which the coil 35 is wound may be the same as or smaller than the diameters of the upper part and the lower part of the bobbin 34.

[0157] A hollow part extending in the longitudinal direction is formed through the column part of the bobbin 34. The cylinder 37 can be housed in the hollow part. The column part of the bobbin 34 may be arranged so as to have a central axis such as the fixed core 31, the movable core 32, and the shaft 44.

[0158] The coil 35 generates a magnetic field by the applied control power supply. 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.

[0159] The coil 35 is wound around the bobbin 34. Specifically, the coil 35 is wound around the column portion of the bobbin 34 and laminated on the radially outer side of the column portion. The coil 35 is housed inside the yoke 33.

[0160] When a control power supply is applied, the coil 35 generates a magnetic field. At this time, the yoke 33 can control the strength or direction of the magnetic field generated by the coil 35. The fixed core 31 can be magnetized by the magnetic field generated by the coil 35.

[0161] When the fixed core 31 is magnetized, the movable core 32 receives an electromagnetic force in the direction away from the fixed core 31, that is, a repulsive force. As a result, the movable core 32 moves upward in the direction toward the fixed core 31 in the illustrated embodiment.

[0162] The return spring 36 provides a restoring force for the movable core 32 to return to its original position when the application of the control power supply is released after the movable core 32 has moved in the direction away from the fixed core 31.

[0163] The return spring 36 is compressed as the movable core 32 moves toward the fixed core 31 and stores the restoring force. At this time, it is preferable that the stored restoring force is smaller than the electromagnetic repulsive force exerted on the movable core 32 when the fixed core 31 is magnetized. This is to prevent the movable core 32 from arbitrarily returning to its original position by the return spring 36 while the control power supply is applied.

[0164] When the application of the control power supply is released, the movable core 32 receives the restoring force from the return spring 36. Of course, the gravity due to the empty weight of the movable core 32 can also act on the movable core 32. As a result, the movable core 32 can move in the direction away from the fixed core 31 and return to its original position.

[0165] The return spring 36 may be provided in any form that can be deformed in shape to store a restoring force, return to its original shape, and transmit the restoring force to the outside. In one embodiment, the return spring 36 may be provided as a coil spring 35.

[0166] A shaft 44 is penetratingly coupled to the return spring 36. The shaft 44 can move in the vertical direction regardless of the shape deformation of the return spring 36 in a state where the return spring 36 is coupled.

[0167] The return spring 36 is accommodated in a hollow portion recessed on the upper side of the movable core 32.

[0168] 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 in the upper and lower directions from inside the cylinder 37.

[0169] 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 peripheral surface of the column portion of the bobbin 34.

[0170] The upper end portion of the cylinder 37 contacts the lower surface of the support plate 14.

[0171] The lower surface of the cylinder 37 can contact the fixed core 31.

[0172] (4) Description of the movable contact portion 40 The movable contact portion 40 includes a movable contact 43 and a configuration for moving the movable contact 43. With the movable contact portion 40, the DC relay 1 can be energized with an external power source or load.

[0173] The movable contact portion 40 is accommodated in the internal space of the upper frame 11. Also, the movable contact portion 40 is accommodated in the arc chamber 21 so as to be vertically movable.

[0174] Above the movable contact part 40, the fixed contact 22 is located. The movable contact part 40 is accommodated inside the arc chamber 21 so as to be movable in the direction toward the fixed contact 22 and in the direction away from the fixed contact 22.

[0175] Below the movable contact part 40, the core part 30 is located. The movement of the movable contact part 40 can be achieved by the movement of the movable core 32.

[0176] In the illustrated embodiment, the movable contact part 40 includes a housing 41, a cover 42, a movable contact 43, a shaft 44, and an elastic part 45.

[0177] The housing 41 houses the movable contact 43 and the elastic part 45 that elastically supports the movable contact 43.

[0178] In the illustrated embodiment, the housing 41 has one side and the other side opposite thereto open. The movable contact 43 may be inserted into the open portion. The non-open side surface of the housing 41 may be configured to surround the accommodated movable contact 43.

[0179] A cover 42 is provided above the housing 41.

[0180] The cover 42 covers the upper surface of the movable contact 43 accommodated in the housing 41.

[0181] The housing 41 and the cover 42 are preferably formed of an insulating material so as to prevent unintentional energization. In one embodiment, the housing 41 and the cover 42 may be formed of a synthetic resin or the like.

[0182] 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 contact 43 accommodated therein can also move upward or downward.

[0183] The housing 41 and the cover 42 can be joined by any member. In one embodiment, the housing 41 and the cover 42 can be joined by fastening members (not shown) such as bolts and nuts.

[0184] The movable contact 43 contacts the fixed contact 22 by the application of a control power supply, and energizes the DC relay 1 with an external power supply and load. Also, when the application of the control power supply is released, the movable contact 43 separates from the fixed contact 22 and does not energize the DC relay 1 with the external power supply and load.

[0185] The movable contact 43 is positioned adjacent to the fixed contact 22.

[0186] The upper side of the movable contact 43 is partially covered by the cover 42. In one embodiment, a part of the upper surface of the movable contact 43 can contact the lower surface of the cover 42.

[0187] 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 compressed state at a predetermined distance so that the movable contact 43 does not move arbitrarily downward.

[0188] The movable contact 43 extends in the longitudinal direction, in the left - right direction in the illustrated embodiment. That is, the length of the movable contact 43 is formed longer than the width. Accordingly, both longitudinal ends of the movable contact 43 accommodated in the housing 41 are exposed outside the housing 41.

[0189] Contact protrusions may be formed so as to protrude upward from both ends by a predetermined distance. The fixed contact 22 contacts the contact protrusions.

[0190] The contact protrusions may be formed at positions corresponding to the respective fixed contacts 22. Thereby, the movement distance of the movable contact 43 is reduced, and the contact reliability between the fixed contact 22 and the movable contact 43 can be improved.

[0191] The width of the movable contact 43 may be the same as the distance at which the respective side surfaces of the housing 41 are separated from each other. That is, when the movable contact 43 is housed in the housing 41, both side surfaces in the width direction of the movable contact 43 may be in contact with the inner surfaces of the respective side surfaces of the housing 41. Thereby, the state in which the movable contact 43 is housed in the housing 41 can be stably maintained.

[0192] The shaft 44 transmits the 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 movable contact 43 can also move upward or downward by the shaft 44.

[0193] The shaft 44 extends in the longitudinal direction, in the vertical direction in the illustrated embodiment.

[0194] The lower end portion of the shaft 44 is inserted and coupled to the movable core 32. When the movable core 32 moves in the vertical direction, the shaft 44 can move in the vertical direction together with the movable core 32.

[0195] A return spring 36 is penetrated and coupled to the body portion of the shaft 44.

[0196] The upper end portion of the shaft 44 is coupled to the housing 41. When the movable core 32 moves, the shaft 44 and the housing 41 can both move.

[0197] The upper end portion and the lower end portion of the shaft 44 may be formed to have a larger diameter than the body portion of the shaft 44. Thereby, the shaft 44 can stably maintain the coupled state with the housing 41 and the movable core 32.

[0198] The elastic part 45 elastically supports the movable contact 43. When the movable contact 43 contacts the fixed contact 22, due to the electromagnetic repulsive force, the movable contact 43 has a tendency to separate from the fixed contact 22. At this time, the elastic part 45 elastically supports the movable contact 43 to prevent the movable contact 43 from arbitrarily separating from the fixed contact 22.

[0199] The elastic part 45 may be provided in any form that stores the restoring force by deforming the shape and can provide the stored restoring force to other members. In one embodiment, the elastic part 45 may be provided as a coil spring 35.

[0200] One end of the elastic part 45 facing the movable contact 43 contacts the lower side of the movable contact 43. Also, the other end facing the one end contacts the upper side of the housing 41.

[0201] The elastic part 45 can elastically support the movable contact 43 in a state where it is compressed by a predetermined distance and stores the restoring force. Thereby, even if an electromagnetic repulsive force is generated between the movable contact 43 and the fixed contact 22, the movable contact 43 does not move arbitrarily.

[0202] For the stable connection of the elastic part 45, a protruding part (not shown) inserted into the elastic part 45 may protrude from the lower side of the movable contact 43. Similarly, a protruding part (not shown) inserted into the elastic part 45 may also protrude from the upper side of the housing 41.

[0203] 2. Description of the arc path forming portion 100 according to the first embodiment of the present invention Hereinafter, the arc path forming part 100 according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 11.

[0204] The arc path forming part 100 forms a magnetic field inside the arc chamber 21. Due to the current supplied to the DC relay 1 and the formed magnetic field, an electromagnetic force is formed inside the arc chamber 21.

[0205] As the fixed contact 22 and the movable contact 43 separate, the arc generated moves outside the arc chamber 21 by the formed electromagnetic force. Specifically, the generated arc moves along the direction of the formed electromagnetic force. Thus, it can be said that the arc path forming portion 100 forms an arc path A.P which is the path along which the generated arc flows.

[0206] The arc path forming portion 100 is located in a space formed inside the upper frame 11. The arc path forming portion 100 is arranged to surround the arc chamber 21. That is, the arc chamber 21 is located inside the arc path forming portion 100.

[0207] Inside the arc path forming portion 100, the fixed contact 22 and the movable contact 43 are located. The arc generated when the fixed contact 22 and the movable contact 43 separate can be induced by the electromagnetic force formed by the arc path forming portion 100.

[0208] The arc path forming portion 100 according to the present embodiment includes a magnet holder portion 110 and a magnet portion 120.

[0209] The magnet holder portion 110 forms the skeleton of the arc path forming portion 100 and fixes the magnet portion 120, which will be described later, outside the arc chamber 21.

[0210] The magnet holder portion 110 is arranged outside the arc chamber 21 and inside the upper frame 11.

[0211] Inside the radially inner side of the magnet holder portion 110, the fixed contact 22 and the movable contact 43 are located. The central portions of the fixed contact 22 and the movable contact 43 can be defined as the central portion C. In the illustrated embodiment, the magnet holder portion 110 is arranged such that its center corresponds to the central portion C of the fixed contact 22 and the movable contact 43.

[0212] The central portion C is located between the first fixed contact 22a and the second fixed contact 22b. Also, directly below the central portion C, the central part of the movable contact portion 40 is located. That is, directly below the central portion C, the central parts of the housing 41, the cover 42, the movable contact 43, the shaft 44, the elastic portion 45, etc. are located.

[0213] Therefore, when the generated arc moves toward the central portion C, damage to the above configuration may occur. To prevent this, the arc path forming portion 100 according to the present embodiment includes a magnet portion 120. A detailed description regarding this will be described later together with the description of the magnet portion 120.

[0214] In one embodiment, the magnet holder portion 110 may be formed of an electrically conductive material. In the above embodiment, the magnet holder portion 110 may be magnetized with the same polarity as a plurality of adjacent magnets.

[0215] The magnet holder portion 110 may be provided with a plurality of holders. Each holder may be coupled with a plurality of magnets. In one embodiment, all of the plurality of magnets attached to one holder are magnetized with the same polarity.

[0216] 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.

[0217] The first holder 111 and the second holder 112 are arranged to be 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 discharged.

[0218] Also, the first holder 111 and the second holder 112 are arranged in a direction intersecting the arrangement direction of the plurality of fixed contacts 22.

[0219] The first holder 111 and the second holder 112 are each bent and extended at a predetermined angle. Also, the bent portions of the first holder 111 and the second holder 112 may have their corners tapered. In one embodiment, the predetermined angle may be a right angle.

[0220] The first holder 111 and the second holder 112 may be in contact with or fixedly coupled to the inner peripheral surface of the upper frame 11. Thereby, it is preferable that the first holder 111 and the second holder 112 are formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0221] The first holder 111 and the second holder 112 are arranged such that the concave portions of each bent portion face each other with the central portions C of the fixed contact 22 and the movable contact 43 interposed therebetween.

[0222] Also, the first holder 111 and the second holder 112 are formed in shapes corresponding to each other. In the illustrated embodiment, the first holder 111 and the second holder 112 are formed in a structure that is symmetric with respect to the central portions C of the plurality of fixed contacts 22 and movable contacts 43.

[0223] The first holder 111 includes a first outer surface 111a and a first inner surface 111b.

[0224] The first outer surface 111a is located on one surface of the first holder 111 opposite to the fixed contact 22 and the movable contact 43. Also, the first outer surface 111a is arranged adjacent to the inner peripheral surface of the upper frame 11. In one embodiment, the first outer surface 111a is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0225] The first inner surface 111b is located on the other surface of the first holder 111 opposite to the first outer surface 111a. Further, the first inner 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 interposed therebetween. In one embodiment, the first inner surface 111b is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0226] The first inner surface 111b is coupled to the first magnet 121 and the second magnet 122 of the magnet portion 120 described later.

[0227] The second holder 112 includes a second outer surface 112a and a second inner surface 112b.

[0228] The second outer surface 112a is located on one surface of the second holder 112 opposite to the fixed contact 22 and the movable contact 43. Further, the second outer surface 112a is disposed adjacent to the inner peripheral surface of the upper frame 11. In one embodiment, the second outer surface 112a is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0229] The second inner surface 112b is located on the other surface of the second holder 112 opposite to the second outer surface 112a. Further, the second inner surface 112b is disposed opposite to the outer peripheral surface of the arc chamber 21 with the third magnet 123 and the fourth magnet 124 interposed therebetween. In one embodiment, the second inner surface 112b is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0230] The second inner surface 112b is coupled to the third magnet 123 and the fourth magnet 124 of the magnet portion 120 described later.

[0231] The magnet portion 120 forms a magnetic field inside the arc chamber 21 in which the fixed contact 22 and the movable contact 43 are accommodated. Further, the fixed contact 22 and the movable contact 43 are located radially inside the magnet portion 120. In the illustrated embodiment, the magnet portion 120 is disposed such that its center corresponds to the center portion C of the fixed contact 22 and the movable contact 43.

[0232] The magnet part 120 can form a magnetic field by itself and also among each other. The magnetic field formed by the magnet part 120 forms an electromagnetic force together with the current that energizes the fixed contact 22 and the movable contact 43. The formed electromagnetic force induces an arc that occurs when the fixed contact 22 and the movable contact 43 are separated.

[0233] At this time, the arc path forming part 100 forms an electromagnetic force in a direction away from the central part C of the fixed contact 22 and the movable contact 43. As a result, the arc path A.P is also formed in a direction away from the central part C of the fixed contact 22 and the movable contact 43.

[0234] As a result, it is not damaged by the arcs generated by each component provided in the DC relay 1. Furthermore, the generated arc can be quickly discharged to the outside of the arc chamber 21.

[0235] The magnet part 120 is coupled to the inner surfaces 111b and 112b of the magnet holder part 110. In one embodiment, a fastening member (not shown) can be provided for coupling the magnet part 120 and the inner surfaces 111b and 112b of the magnet holder part 110.

[0236] The magnet part 120 may be provided with a plurality of magnets.

[0237] In the present embodiment, the magnet part 120 includes a total of four magnets such as the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124.

[0238] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may each be magnetized and provided in any form that can form a magnetic field inside the arc chamber 21. Also, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all formed so as to have polarities in the width direction.

[0239] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are arranged at intervals from each other. That is, a vacant space is formed between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124. Further, 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.

[0240] 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 peripheral surface of the arc chamber 21. Thereby, 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 peripheral surface of the arc chamber 21.

[0241] 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 corresponding to each other. Specifically, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 may be formed in shapes in which their widths and the lengths in the width direction respectively correspond to each other.

[0242] The first magnet 121 is coupled to the first inner surface 111b of the first holder 111. Further, the first magnet 121 extends along the first inner 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 surface 111b of the first holder 111.

[0243] The first magnet 121 includes a first facing surface 121a and a first opposite surface 121b.

[0244] The first facing surface 121a is located on one surface of the first magnet 121 facing the center C of the fixed contact 22 and the movable contact 43. Further, the first facing surface 121a is arranged adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the first facing surface 121a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0245] The first opposite surface 121b is located on the other surface of the first magnet 121 opposite to the first facing surface 121a. Also, the first opposite surface 121b is disposed to face the inner peripheral surface of the upper frame 11 with the first holder 111 interposed therebetween. In one embodiment, the first opposite surface 121b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0246] The second magnet 122 is coupled to the first inner surface 111b of the first holder 111. Also, the second magnet 122 extends along the first inner surface 111b from the other end of the first holder 111 on the side opposite to the first magnet 121. In one embodiment, the second magnet 122 is formed in a shape corresponding to the first inner surface 111b of the first holder 111.

[0247] The extending direction of the second magnet 122 intersects with the extending direction of the first magnet 121. This is due to the fact that the first holder 111 coupled to the first magnet 121 and the second magnet 122 is bent and extends at a predetermined angle.

[0248] The second magnet 122 is disposed so as to be displaced without facing the first magnet 121 across an imaginary line connecting the central portions C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 111 and the second holder 112.

[0249] The second magnet 122 includes a second facing surface 122a and a second opposite surface 122b.

[0250] The second facing surface 122a is located on one surface of the second magnet 122 facing the central portion C of the fixed contact 22 and the movable contact 43. Also, the second facing surface 122a is disposed adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the second facing surface 122a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0251] The second opposite surface 122b is located on the other surface of the second magnet 122 opposite to the second facing surface 122a. Also, the second opposite surface 122b is disposed opposite to the inner peripheral surface of the upper frame 11 with the first holder 111 interposed therebetween. In one embodiment, the second opposite surface 122b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0252] The third magnet 123 is coupled to the second inner surface 112b of the second holder 112. Also, the third magnet 123 extends along the second inner surface 112b from one end of the second holder 112 toward the second magnet 122. In one embodiment, the third magnet 123 is formed in a shape corresponding to the second inner surface 112b of the second holder 112. In the illustrated embodiment, the third magnet 123 extends in a direction parallel to the extension direction of the first magnet 121.

[0253] The third magnet 123 is arranged so as to be displaced without facing the first magnet 121 with respect to the center C of the fixed contact 22 and the movable contact 43.

[0254] The third magnet 123 includes a third facing surface 123a and a third opposite surface 123b.

[0255] The third facing surface 123a is located on one surface of the third magnet 123 facing the center C of the fixed contact 22 and the movable contact 43. Also, the third facing surface 123a is disposed adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the third facing surface 123a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0256] The third opposite surface 123b is located on the other surface of the third magnet 123 opposite to the third facing surface 123a. Also, the third opposite surface 123b is disposed opposite to the inner peripheral surface of the upper frame 11 with the second holder 112 interposed therebetween. In one embodiment, the third opposite surface 123b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0257] The fourth magnet 124 is coupled to the second inner surface 112b of the second holder 112. Further, the fourth magnet 124 extends along the second inner surface 112b from the other end facing the first magnet 121 of the second holder 112, which is opposite to the third magnet 123. In one embodiment, the fourth magnet 124 is formed in a shape corresponding to the second inner surface 112b of the second holder 112. In the illustrated embodiment, the fourth magnet 124 extends in a direction parallel to the extension direction of the second magnet 122.

[0258] The extension direction of the fourth magnet 124 intersects the extension direction of the third magnet 123. This is due to the second holder 112 coupled with the third magnet 123 and the fourth magnet 124 being bent and extended at a predetermined angle.

[0259] The fourth magnet 124 is arranged so as to be displaced without facing the third magnet 123 across a virtual line connecting the central portions C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 111 and the second holder 112.

[0260] The fourth magnet 124 is arranged so as to be displaced without facing the second magnet 122 with respect to the central portion C of the fixed contact 22 and the movable contact 43.

[0261] In one embodiment, the opposing surfaces 121a, 122a, 123a, 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, 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 those of the opposing surfaces 121a, 122a, 123a, 124a, and similarly, all with the same polarity.

[0262] In other embodiments, the opposing surfaces 121a, 122a of the first magnet 121 and the second magnet 122 are magnetized with one of the polarities of the N pole and the S pole, and the opposing surfaces 123a, 124a of the third magnet 123 and the fourth magnet 124 are magnetized with the other of the polarities of the N pole and the S pole.

[0263] Also, the shortest distances from the opposing surfaces 121a, 122a, 123a, and 124 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.

[0264] Also, the shortest path between the first magnet 121 and the third magnet 123 and the shortest path between the second magnet 122 and the fourth magnet 124 overlap with the center C of the fixed contact 22 and the movable contact 43 and the moving direction of the movable contact 43.

[0265] Referring to FIGS. 3 to 5, the opposing surfaces 121a, 122a, 123a, and 124 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 124 are all magnetized with S poles. As a result, a magnetic field in a direction of pushing each other is formed between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124.

[0266] Also, the first holder 111 and the second holder 112 are also magnetized together by the magnet portion 120 to form an accompanying magnetic field.

[0267] In the embodiment shown in FIG. 4, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0268] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left - hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the right. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0269] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper right.

[0270] In the embodiment shown in FIG. 5, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0271] When applying Fleming's left-hand rule 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 formed to be directed toward the lower left. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed toward the lower left.

[0272] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper right.

[0273] Referring to FIGS. 6 to 8, the opposing surfaces 121a, 122a, 123a, 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized with the S pole, and the opposing surfaces 121b, 122b, 123b, 124b are all magnetized with the N pole. As a result, a magnetic field in the mutually pushing direction is formed between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124.

[0274] Also, the first holder 111 and the second holder 112 are both magnetized by the magnet portion 120 to form an accompanying magnetic field.

[0275] In the embodiment shown in FIG. 7, the direction of the current is from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a.

[0276] Considering the direction of the current and the direction of the magnetic field in the first fixed contact 22a and applying Fleming's left - hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the left. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the left.

[0277] Similarly, considering the direction of the current and the direction of the magnetic field in the second fixed contact 22b and applying Fleming's left - hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0278] In the embodiment shown in FIG. 8, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0279] Considering the direction of the current and the direction of the magnetic field in the first fixed contact 22a and applying Fleming's left - hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the right. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the right.

[0280] Similarly, considering the direction of the current and the direction of the magnetic field in the second fixed contact 22b and applying Fleming's left - hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0281] Referring to FIGS. 9 to 11, the opposing surfaces 121a and 122a of the first magnet 121 and the second magnet 122 are all magnetized with N poles, and the opposing surfaces 123a and 124a of the third magnet 123 and the fourth magnet 124 are all magnetized with S poles.

[0282] Thereby, magnetic fields in directions pushing each other are formed between the first magnet 121 and the second magnet 122 and between the third magnet 123 and the fourth magnet 124. Conversely, magnetic fields in directions from the first magnet 121 toward the third magnet 123 and the fourth magnet 124 are formed between the first magnet 121 and the third magnet 123 and the fourth magnet 124. Also, magnetic fields in directions from the second magnet 122 toward the third magnet 123 and the fourth magnet 124 are formed between the second magnet 122 and the third magnet 123 and the fourth magnet 124.

[0283] Also, the first holder 111 and the second holder 112 are also magnetized together by the magnet portion 120 to form an accompanying magnetic field.

[0284] In the embodiment shown in FIG. 10, the direction of the current is a direction from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a.

[0285] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the left. Thereby, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the left.

[0286] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. Thereby, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0287] In the embodiment shown in FIG. 11, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0288] Considering the direction of the current and the direction of the magnetic field in the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed upward and to the right. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed upward and to the right.

[0289] Similarly, considering the direction of the current and the direction of the magnetic field in the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed downward and to the left. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed downward and to the left.

[0290] Therefore, the arc path forming portion 100 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C regardless of the polarity of the magnet portion 120 or the direction of the current supplied to the DC relay.

[0291] This can prevent damage to each component of the DC relay 1 disposed adjacent to the central portion C. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0292] 3. Description of the arc path forming portion 200 according to the second embodiment of the present invention Hereinafter, the arc path forming portion 200 according to the second embodiment of the present invention will be described with reference to FIGS. 12 to ■ 20.

[0293] The arc path forming portion 200 according to the present embodiment includes a magnet holder portion 210 and a magnet portion 220.

[0294] The magnet holder part 210 according to the present embodiment has the same structure and function as the magnet holder part 110 according to the foregoing embodiment. However, the magnet part 220 according to the present embodiment is different from the magnet part 120 according to the foregoing embodiment in that the first magnet 221 and the third magnet 223 are respectively arranged opposite to each other with a virtual line connecting the central part C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 211 and the second holder 212 interposed therebetween.

[0295] Accordingly, the description of the magnet holder part 210 is replaced with the description of the magnet holder part 110 according to the foregoing embodiment, and the magnet part 220 will be described centering on the differences from the magnet part 120 according to the foregoing embodiment.

[0296] The magnet part 220 according to the present embodiment includes a first magnet 221, a second magnet 222, a third magnet 223, and a fourth magnet 224.

[0297] The first magnet 221 is arranged opposite to the second magnet 222 with a virtual line connecting the central part C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 211 and the second holder 212 interposed therebetween.

[0298] The third magnet 223 is arranged opposite to the fourth magnet 224 with a virtual line connecting the central part C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 211 and the second holder 212 interposed therebetween.

[0299] 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.

[0300] Referring to FIGS. 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 to the N pole, and the opposite surfaces 221b, 222b, 223b, 224b are all magnetized to the S pole. As a result, a magnetic field in the direction of pushing each other is formed between the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224.

[0301] Also, the first holder 211 and the second holder 212 are also magnetized together by the magnet portion 220 to form an accompanying magnetic field.

[0302] In the embodiment shown in FIG. 13, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0303] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the right. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0304] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0305] In the embodiment shown in FIG. 14, the direction of the current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0306] When applying Fleming's left-hand rule 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 formed to be directed toward the lower left side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed toward the lower left side.

[0307] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper right side.

[0308] Therefore, the arc path forming portion 200 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C regardless of the polarity of the magnet portion 220 or the direction of the current supplied to the DC relay.

[0309] This can prevent damage to each component of the DC relay 1 disposed adjacent to the central portion C. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0310] Referring to FIGS. 15 to 17, 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 the S pole, and the opposing surfaces 221b, 222b, 223b, 224b are all magnetized with the N pole. As a result, a magnetic field in a direction of pushing each other is formed between the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224.

[0311] Also, the first holder 211 and the second holder 212 are both magnetized by the magnet portion 220 to form an accompanying magnetic field.

[0312] In the embodiment shown in FIG. 16, the direction of the current is from the second fixed contact 22b, through the movable contact 43, and out of the first fixed contact 22a.

[0313] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward and to the left. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward and to the left.

[0314] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward and to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward and to the right.

[0315] In the embodiment shown in FIG. 17, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out of the second fixed contact 22b.

[0316] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward and to the right. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed downward and to the right.

[0317] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward and to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward and to the right.

[0318] Therefore, the arc path forming unit 200 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C regardless of the polarity of the magnet portion 220 or the direction of the current supplied to the DC relay.

[0319] Thereby, damage to each component of the DC relay 1 disposed adjacent to the central portion C can be prevented. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0320] Referring to FIGS. 18 to 20, the opposing surfaces 221a and 222a of the first magnet 221 and the second magnet 222 are all magnetized with the N pole, and the opposing surfaces 223a and 224a of the third magnet 223 and the fourth magnet 224 are all magnetized with the S pole.

[0321] Thereby, magnetic fields in directions pushing each other are formed between the first magnet 221 and the second magnet 222 and between the third magnet 223 and the fourth magnet 224. On the contrary, between the first magnet 221 and the third magnet 223 and the fourth magnet 224, a magnetic field in a direction from the first magnet 221 toward the third magnet 223 and the fourth magnet 224 is formed. Also, between the second magnet 222 and the third magnet 223 and the fourth magnet 224, a magnetic field in a direction from the second magnet 222 toward the third magnet 223 and the fourth magnet 224 is formed.

[0322] Also, the first holder 211 and the second holder 212 are also magnetized together by the magnet portion 220 to form an accompanying magnetic field.

[0323] In the embodiment shown in FIG. 19, the direction of the current is from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a.

[0324] When applying Fleming's left - hand rule considering 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 formed to be directed downward to the right. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0325] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed upward to the right. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0326] In the embodiment shown in FIG. 20, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0327] When applying Fleming's left - hand rule considering 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 formed to be directed upward. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed upward.

[0328] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed downward. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed downward.

[0329] Therefore, when current is passed in the direction from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b, the arc path forming portion 200 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C.

[0330] This can prevent damage to each component of the DC relay 1 disposed adjacent to the central portion C. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0331] 4. Description of the arc path forming portion 300 according to the third embodiment of the present invention Hereinafter, the arc path forming portion 300 according to the third embodiment of the present invention will be described with reference to FIGS. 21 to 32.

[0332] The arc path forming portion 300 according to the present embodiment includes a magnet holder portion 310 and a magnet portion 320.

[0333] The magnet holder portion 310 according to the present embodiment has the same structure and function as the magnet holder portion 210 according to the foregoing embodiment. However, the magnet portion 320 according to the present embodiment is different from the magnet portion 220 according to the foregoing embodiment in that at least two of the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 are formed in different sizes from each other.

[0334] Accordingly, the description of the magnet holder portion 310 will be replaced with the description of the magnet holder portion 210 according to the foregoing embodiment, and the magnet portion 320 will be described centering on the differences from the magnet portion 220 according to the foregoing embodiment.

[0335] The magnet portion 320 according to the present embodiment includes a first magnet 321, a second magnet 322, a third magnet 323, and a fourth magnet 324.

[0336] At least two of the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324 are formed in different sizes from each other.

[0337] In one embodiment, the first magnet 321 may be formed with a first length in the longitudinal direction, and the second magnet 322, the third magnet 323, and the fourth magnet 324 may be formed with a second length in the longitudinal direction.

[0338] In the illustrated embodiment, the first magnet 321 and the third magnet 323 are formed with different sizes from each other, and the second magnet 322 and the fourth magnet 324 are also formed with different sizes from each other.

[0339] In one embodiment, the first magnet 321 and the second magnet 322 may be formed with a first length in the longitudinal direction, and the third magnet 323 and the fourth magnet 324 may be formed with a second length in the longitudinal direction.

[0340] The second magnet 322 is disposed opposite to the first magnet 321 with a virtual line connecting the central portion C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 311 and the second holder 312 interposed therebetween.

[0341] The fourth magnet 324 is symmetric with the second magnet 322 with respect to the central portion C of the fixed contact 22 and the movable contact 43.

[0342] Further, the fourth magnet 324 is disposed opposite to the third magnet 323 with a virtual line connecting the central portion C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 311 and the second holder 312 interposed therebetween.

[0343] Referring to FIGS. 21 to 23, 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. Thereby, a magnetic field in the direction of pushing each other is formed between the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324.

[0344] Further, the first holder 311 and the second holder 312 are also magnetized together by the magnet portion 320 to form an accompanying magnetic field.

[0345] In the embodiment shown in FIG. 22, the direction of the current is from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a.

[0346] When applying Fleming's left - hand rule considering 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 formed to be directed towards the lower right side. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed towards the lower right side.

[0347] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed towards the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the upper right side.

[0348] In the embodiment shown in FIG. 23, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0349] When applying Fleming's left - hand rule considering 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 formed to be directed towards the lower left side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed towards the lower left side.

[0350] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed towards the upper left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the upper left side.

[0351] Referring to FIGS. 24 to 26, 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. As a result, a magnetic field in the mutually pushing direction is formed between the first magnet 321, the second magnet 322, the third magnet 323, and the fourth magnet 324.

[0352] Also, the first holder 311 and the second holder 312 are both magnetized by the magnet portion 320 to form an accompanying magnetic field.

[0353] In the embodiment shown in FIG. 25, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0354] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the left. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the left.

[0355] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the left. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the left.

[0356] In the embodiment shown in FIG. 26, the direction of the current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0357] When applying Fleming's left-hand rule considering 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 formed to be directed towards the lower right side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed towards the lower right side.

[0358] Similarly, when applying Fleming's left-hand rule considering 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 formed to be directed towards the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the upper right side.

[0359] Referring to FIGS. 27 to 29, the opposing surfaces 321a, 322a of the first magnet 321 and the second magnet 322 are all magnetized with the N pole, and the opposing surfaces 323a, 324a of the third magnet 323 and the fourth magnet 324 are all magnetized with the S pole.

[0360] As a result, between the first magnet 321 and the second magnet 322 and between the third magnet 323 and the fourth magnet 324, magnetic fields in the mutually pushing-out directions are formed. Conversely, between the first magnet 321 and the third magnet 323 and the fourth magnet 324, magnetic fields in the directions from the first magnet 321 towards the third magnet 323 and the fourth magnet 324 are formed. Also, between the second magnet 322 and the third magnet 323 and the fourth magnet 324, magnetic fields in the directions from the second magnet 322 towards the third magnet 323 and the fourth magnet 324 are formed.

[0361] Also, the first holder 311 and the second holder 312 are both magnetized by the magnet portion 320 to form an accompanying magnetic field.

[0362] In the embodiment shown in FIG. 28, the direction of the current is the direction from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a.

[0363] When applying Fleming's left - hand rule considering 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 formed to be directed towards the lower right side. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed towards the lower right side.

[0364] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed towards the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the upper right side.

[0365] In the embodiment shown in FIG. 29, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0366] When applying Fleming's left - hand rule considering 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 formed to be directed towards the upper left side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed towards the upper left side.

[0367] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed towards the lower left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the lower left side.

[0368] Referring to FIGS. 30 to 32, the opposing surfaces 321a, 322a of the first magnet 321 and the second magnet 322 are all magnetized with S - poles, and the opposing surfaces 323a, 324a of the third magnet 323 and the fourth magnet 324 are all magnetized with N - poles.

[0369] As a result, between the first magnet 321 and the second magnet 322 and between the third magnet 323 and the fourth magnet 324, magnetic fields in the direction of pushing each other out are formed. Conversely, between the first magnet 321 and the third magnet 323 and the fourth magnet 324, magnetic fields in the direction from the third magnet 323 and the fourth magnet 324 toward the first magnet 321 are formed. Also, between the second magnet 322 and the third magnet 323 and the fourth magnet 324, magnetic fields in the direction from the third magnet 323 and the fourth magnet 324 toward the second magnet 322 are formed.

[0370] Also, the first holder 311 and the second holder 312 are both magnetized by the magnet portion 320 to form an accompanying magnetic field.

[0371] In the embodiment shown in FIG. 31, the direction of the current is the direction from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0372] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field at the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed to the upper left side. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed to the upper left side.

[0373] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field at the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed to the lower left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed to the lower left side.

[0374] In the embodiment shown in FIG. 32, the direction of the current is the direction from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0375] When applying Fleming's left-hand rule 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 formed to be directed toward the lower right side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed toward the lower right side.

[0376] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper right side.

[0377] Therefore, the arc path forming portion 300 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C regardless of the polarity of the magnet portion 320 or the direction of the current supplied to the DC relay.

[0378] Thereby, damage to each component of the DC relay 1 disposed adjacent to the central portion C can be prevented. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0379] 5. Description of the arc path forming portion 400 according to the fourth embodiment of the present invention Hereinafter, the arc path forming portion 400 according to the fourth embodiment of the present invention will be described with reference to FIGS. 33 to 41.

[0380] The arc path forming portion 400 according to the present embodiment includes a magnet holder portion 410 and a magnet portion 420.

[0381] The magnet holder part 410 according to this embodiment has the same structure and function as the magnet holder part 310 according to the aforementioned embodiment. However, the magnet part 420 according to this embodiment is different from the magnet part 320 according to the aforementioned embodiment in that the first magnet 421 and the second magnet 422 are formed in different sizes from each other, and the third magnet 423 and the fourth magnet 424 are formed in different sizes from each other.

[0382] Accordingly, the description of the magnet holder part 410 is replaced with the description of the magnet holder part 310 according to the aforementioned embodiment, and the magnet part 420 will be described centering on the differences from the magnet part 320 according to the aforementioned embodiment.

[0383] The magnet part 420 according to this embodiment includes a first magnet 421, a second magnet 422, a third magnet 423, and a fourth magnet 424.

[0384] The first magnet 421 and the second magnet 422 are formed in different sizes from each other. Also, the third magnet 423 and the fourth magnet 424 are formed in different sizes from each other.

[0385] In one embodiment, the first magnet 421 and the third magnet 423 are formed with a first length in the longitudinal direction, and the second magnet 422 and the fourth magnet 424 are formed with a second length in the longitudinal direction.

[0386] The third magnet 423 is symmetric with the first magnet 421 with respect to the center C of the fixed contact 22 and the movable contact 43.

[0387] The fourth magnet 424 is symmetric with the second magnet 422 with respect to the center C of the fixed contact 22 and the movable contact 43.

[0388] Referring to FIGS. 33 to 35, the opposing surfaces 421a, 422a, 423a, 424a of the first magnet 421, the second magnet 422, the third magnet 423, and the fourth magnet 424 are all magnetized with N poles, and the opposite surfaces 421b, 422b, 423b, 424b are all magnetized with S poles. As a result, a magnetic field in a direction of pushing each other is formed between the first magnet 421, the second magnet 422, the third magnet 423, and the fourth magnet 424.

[0389] Also, the first holder 411 and the second holder 412 are also magnetized together by the magnet portion 420 to form an accompanying magnetic field.

[0390] In the embodiment shown in FIG. 34, the direction of the current is a direction from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0391] Considering the direction of the current and the direction of the magnetic field at the first fixed contact 22a and applying Fleming's left-hand rule, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the right. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0392] Similarly, considering the direction of the current and the direction of the magnetic field at the second fixed contact 22b and applying Fleming's left-hand rule, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0393] In the embodiment shown in FIG. 35, the direction of the current is a direction from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0394] When applying Fleming's left-hand rule 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 formed to be directed to the lower left side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed to the lower left side.

[0395] Similarly, when applying Fleming's left-hand rule 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 formed to be directed to the upper left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper left side.

[0396] Referring to FIGS. 36 to 38, the opposing surfaces 421a, 422a, 423a, 424a of the first magnet 421, the second magnet 422, the third magnet 423, and the fourth magnet 424 are all magnetized with the S pole, and the opposing surfaces 421b, 422b, 423b, 424b are all magnetized with the N pole. As a result, a magnetic field in the mutually pushing direction is formed between the first magnet 421, the second magnet 422, the third magnet 423, and the fourth magnet 424.

[0397] Also, the first holder 411 and the second holder 412 are also magnetized together by the magnet portion 420 to form an accompanying magnetic field.

[0398] In the embodiment shown in FIG. 37, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0399] When applying Fleming's left-hand rule 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 formed to be directed to the lower left side. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0400] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper left side.

[0401] In the embodiment shown in FIG. 38, the direction of the current is from the first fixed contact 22a, through the movable contact 43, and out to the second fixed contact 22b.

[0402] When applying Fleming's left-hand rule 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 formed to be directed toward the lower right side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed toward the lower right side.

[0403] Similarly, when applying Fleming's left-hand rule 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 formed to be directed toward the upper right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed toward the upper right side.

[0404] Referring to FIGS. 39 to 41, the opposing surfaces (421a, 422a) of the first magnet 421 and the second magnet 422 are all magnetized with the N pole, and the opposing surfaces (423a, 424a) of the third magnet 423 and the fourth magnet 424 are all magnetized with the S pole.

[0405] As a result, magnetic fields in the direction of pushing each other are formed between the first magnet 421 and the second magnet 422, and between the third magnet 423 and the fourth magnet 424. On the contrary, magnetic fields in the direction from the first magnet 421 toward the third magnet 423 and the fourth magnet 424 are formed between the first magnet 421 and the third magnet 423 and the fourth magnet 424. Also, magnetic fields in the direction from the second magnet 422 toward the third magnet 423 and the fourth magnet 424 are formed between the second magnet 422 and the third magnet 423 and the fourth magnet 424.

[0406] Also, the first holder 411 and the second holder 412 are both magnetized by the magnet portion 420 to form an accompanying magnetic field.

[0407] In the embodiment shown in FIG. 40, the direction of the current is the direction from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0408] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field at the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed to the upper left side. As a result, the arc path A.P near the first fixed contact 22a is also formed to be directed to the upper left side.

[0409] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field at the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed to the upper left side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper left side.

[0410] In the embodiment shown in FIG. 41, the direction of the current is the direction from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0411] When applying Fleming's left - hand rule considering 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 formed to be directed towards the lower right side. As a result, the arc path A.P near the first fixed contact 22a is formed to be directed towards the lower right side.

[0412] Similarly, when applying Fleming's left - hand rule considering 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 formed to be directed towards the lower right side. As a result, the arc path A.P near the second fixed contact 22b is also formed to be directed towards the lower right side.

[0413] Therefore, the arc path forming portion 400 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central portion C regardless of the polarity of the magnet portion 420 or the direction of the current supplied to the DC relay.

[0414] Thereby, damage to each component of the DC relay 1 arranged adjacent to the central portion C can be prevented. Furthermore, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0415] As described above, the preferred embodiments of the present invention have been described with reference to the preferred embodiments, but the present invention is not limited to the configurations of the described embodiments.

[0416] Also, those having ordinary knowledge in the technical field to which the present invention pertains can make various modifications and changes without departing from the spirit and scope of the present invention described in the claims.

[0417] Furthermore, the above - mentioned embodiments can be configured by selectively combining all or part of each embodiment so that various modifications can be made.

Explanation of reference numerals

[0418] 1 DC Relay 10 Frame part 11 Upper frame 12 Lower frame 13 Insulating plate 14 Support plate 20 Opening / closing part 21 Arc chamber 22 Fixed contact 22a First fixed contact 22b Second fixed contact 30 Core part 31 Fixed core 32 Movable core 33 Yoke 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 First embodiment of arc path forming part 110 Magnet holder part 111 First holder 111a First outer surface 111b First inner surface 112 Second holder 112a Second outer surface 112b Second inner surface 120 Magnet part 121 First magnet 121a First opposing surface 121b First opposite surface 122 Second magnet 122a Second opposing surface 122b Second opposite surface 123 Third magnet 123a Third opposing surface 123b Third opposite surface 124 Fourth magnet 124a Fourth opposing surface 124b Fourth opposite surface Second Embodiment of 200 Arc Path Forming Unit 210 Magnet Holder Unit 211 First Holder 211a First Outer Surface 211b First Inner Surface 212 Second Holder 212a Second Outer Surface 212b Second Inner Surface 220 Magnet Unit 221 First Magnet 221a First Opposing Surface 221b First Opposite Surface 222 Second Magnet 222a Second Opposing Surface 222b Second Opposite Surface 223 Third Magnet 223a Third Opposing Surface 223b Third Opposite Surface 224 Fourth Magnet 224a Fourth Opposing Surface 224b Fourth Opposite Surface Third Embodiment of 300 Arc Path Forming Unit 310 Magnet Holder Unit 311 First Holder 311a First Outer Surface 311b First Inner Surface 312 Second Holder 312a Second Outer Surface 312b Second Inner Surface 320 Magnet Unit 321 First Magnet 321a First Opposing Surface 321b First Opposite Surface 322 Second Magnet 322a Second Opposing Surface 322b Second Opposite Surface 323 Third Magnet 323a Third Opposing Surface 323b Third Opposite Surface 324 Fourth Magnet 324a Fourth Opposing Surface 324b Fourth Opposite Surface Fourth Embodiment of 400 Arc Path Forming Unit 410 Magnet Holder Section 411 First Holder 411a First Outer Surface 411b First Inner Surface 412 Second Holder 412a Second Outer Surface 412b Second Inner Surface 420 Magnet Section 421 First Magnet 421a First Opposing Surface 421b First Opposite Surface 422 Second Magnet 422a Second Opposing Surface 422b Second Opposite Surface 423 Third Magnet 423a Third Opposing Surface 423b Third Opposite Surface 424 Fourth Magnet 424a Fourth Opposing Surface 424b Fourth Opposite Surface A.P Path of Arc

Claims

1. An arc chamber that houses a plurality of fixed contacts and movable contacts therein; A magnet holder portion that is disposed outside the arc chamber and includes a first holder and a second holder that are different from each other; and A magnet portion that is attached to one surface of the magnet holder portion facing the arc chamber and forms a magnetic field in the arc chamber, The first holder and the second holder, Each is bent and extended at a predetermined angle, arranged spaced apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, and the respective recesses are arranged to face each other, The magnet portion, A first magnet and a second magnet that are disposed adjacent to one surface of the first holder facing the arc chamber and extend along the one surface of the first holder from one end or the other end of the first holder; and A third magnet and a fourth magnet that are disposed adjacent to one surface of the second holder facing the arc chamber and extend along the one surface of the second holder from one end facing the second magnet or the other end facing the first magnet of the second holder, The first magnet and the second magnet, Are arranged so as to be displaced without facing each other with respect to the third magnet and the fourth magnet respectively with reference to the center point of the plurality of fixed contacts, The first magnet, Extends in a direction parallel to the extension direction of the third magnet, The second magnet, Extends in a direction parallel to the extension direction of the fourth magnet, and The first magnet and the second magnet, An arc path forming portion in which their respective extension directions intersect each other.

2. The first magnet, The shortest path with the third magnet overlaps with the center point of the plurality of fixed contacts and the movement direction of the movable contact, The second magnet, The shortest path with the fourth magnet overlaps with the center point of the plurality of fixed contacts and the movement direction of the movable contact, the arc path forming portion according to Claim 1.

3. The first magnet, Is arranged so as to be displaced without facing each other with respect to the second magnet across a virtual line connecting the center point of the plurality of fixed contacts and the recesses of the first holder and the second holder, The third magnet, Is arranged so as to be displaced without facing each other with respect to the fourth magnet across the virtual line, the arc path forming portion according to Claim 1.

4. The magnet portion, The shortest distance between the first magnet and the second magnet is formed to be the same as the shortest distance between the third magnet and the fourth magnet, the arc path forming portion according to Claim 3.

5. The first magnet is, arranged to face each other with a virtual line connecting the center points of the second magnet and the plurality of fixed contacts and the recesses of the first holder and the second holder interposed therebetween, The third magnet is, The arc path forming portion according to claim 1, which is arranged to face each other with the fourth magnet and the virtual line interposed therebetween.

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

7. An arc chamber in which a plurality of fixed contacts and movable contacts are accommodated; A magnet holder portion disposed outside the arc chamber and including first and second holders different from each other; and A magnet portion attached to one surface of the magnet holder portion facing the arc chamber and forming a magnetic field in the arc chamber, The first holder and the second holder are, each bent and extended at a predetermined angle, arranged to be separated from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, and the respective recesses are arranged to face each other, The magnet portion is, a first magnet and a second magnet disposed adjacent to one surface of the first holder facing the arc chamber and extending along the one surface of the first holder from one end or the other end of the first holder; and a third magnet and a fourth magnet disposed adjacent to one surface of the second holder facing the arc chamber and extending along the one surface of the second holder from one end facing the second magnet of the second holder or the other end facing the first magnet, The first magnet and the second magnet are, arranged so as to be displaced without facing the third magnet and the fourth magnet with respect to the center points of the plurality of fixed contacts, respectively, The first magnet, the second magnet, the third magnet, and the fourth magnet are, an arc path forming portion magnetized with all the same polarities.

8. An arc chamber in which a plurality of fixed contacts and movable contacts are accommodated; A magnet holder portion disposed outside the arc chamber and including first and second holders different from each other; and A magnet portion attached to one surface of the magnet holder portion facing the arc chamber and forming a magnetic field in the arc chamber, The first holder and the second holder are, Each is bent and extended at a predetermined angle, arranged to be spaced apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, with the respective recesses arranged to face each other. The magnet portion is a first magnet and a second magnet that are arranged adjacent to one surface of the first holder facing the arc chamber and extend along the one surface of the first holder from one end or the other end of the first holder; and a third magnet and a fourth magnet that are arranged adjacent to one surface of the second holder facing the arc chamber and extend along the one surface of the second holder from one end of the second holder facing the second magnet or the other end of the second holder facing the first magnet, The first magnet and the second magnet are arranged so as to be displaced without facing the third magnet and the fourth magnet respectively with reference to the center points of the plurality of fixed contacts. The first magnet and the second magnet are magnetized with one of the polarities of N pole and S pole, The third magnet and the fourth magnet are an arc path forming portion magnetized with the other one of the polarities of N pole and S pole.

9. A plurality of fixed contacts provided and positioned spaced apart from each other in one direction; A movable contact that contacts or separates from the fixed contact; An arc chamber in which a space for accommodating the fixed contact and the movable contact is formed; A frame surrounding the arc chamber; A magnet holder portion disposed between the outside of the arc chamber and the inside of the frame and including a first holder and a second holder that are different from each other; and A magnet portion attached to one surface of the magnet holder portion facing the arc chamber and forming a magnetic field in the arc chamber. The first holder and the second holder are each bent and extended at a predetermined angle, arranged to be spaced apart from each other and in a direction intersecting the arrangement direction of the plurality of fixed contacts, with the respective recesses arranged to face each other. The magnet portion is a first magnet and a second magnet that are arranged adjacent to one surface of the first holder facing the arc chamber and extend along the one surface of the first holder from one end or the other end of the first holder; and a third magnet and a fourth magnet that are arranged adjacent to one surface of the second holder facing the arc chamber and extend along the one surface of the second holder from one end of the second holder facing the second magnet or the other end of the second holder facing the first magnet, The first magnet and the second magnet are Each is arranged so as to be displaced without facing the third magnet and the fourth magnet with reference to the center points of the plurality of fixed contacts. The first magnet extends in a direction parallel to the extending direction of the third magnet. The second magnet extends in a direction parallel to the extending direction of the fourth magnet, and the extending direction thereof intersects the extending direction of the first magnet. The first magnet is arranged so as to be displaced without facing each other across a virtual line connecting the center points of the second magnet and the plurality of fixed contacts and the recesses of the first holder and the second holder. The third magnet is arranged so as to be displaced without facing each other across the virtual line with the fourth magnet. DC relay. **Claim 10** The first magnet is arranged to face each other across a virtual line connecting the center points of the second magnet and the plurality of fixed contacts and the recesses of the first holder and the second holder. The third magnet is arranged to face each other across the virtual line with the fourth magnet. The DC relay according to claim 9.

Images