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 to the outside, comprising 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 are each bent and extended at a predetermined angle and have magnet parts attached to both ends, and the magnetic field formed by the magnet part forms an electromagnetic force together with a current flowing through the DC relay, thereby guiding the arc in a direction away from a fixed contact.

Description

Technical Field

[0001] The present invention relates to an arc path forming portion and a direct current relay including the same, and more specifically, to an arc path forming portion capable of effectively guiding the generated arc outward and a direct current relay including the same.

Background Art

[0002] A direct current relay means a device that utilizes 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 direct current 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 can contact or separate from each other.

[0004] The conduction through the direct current relay is allowed or interrupted 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 separate, an arc is generated between the fixed contact and the movable contact. An arc is a flow of current with high voltage and high temperature. Therefore, the generated arc must be quickly discharged from the direct current relay through a preset path.

[0006] The arc discharge path is formed by a magnet provided in the direct current 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 generated electromagnetic force due to the formed magnetic field and the flow of current.

[0007] In a conventional direct current 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 the corresponding position is not immediately discharged outward.

[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 is moved toward the central portion, and when the arc moved to the central portion cannot immediately move 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 the 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 inexperienced operation or the like cannot be excluded regardless of the user's intention.

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

[0013] Korean Registered Patent Document 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 by using a plurality of permanent magnets.

[0014] However, although such a type of DC relay can prevent the movement of the movable contact by using a plurality of permanent magnets, it has a limitation in that there is no consideration for a solution for controlling the direction of the arc discharge path.

[0015] Korean Registered Patent Document No. 10-1216824 discloses a DC relay. Specifically, it discloses a DC relay with a structure that can prevent arbitrary separation between a movable contact and a fixed contact by using a damping magnet.

[0016] However, this 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 limitation in that it cannot present a solution for forming a discharge path for the arc generated when the movable contact and the fixed contact are separated. [Patent Document 1] Korean Registered Patent Document No. 10-1696952 (January 16, 2017) [Patent Document 2] Korean Registered Patent Document No. 10-1216824 (December 28, 2012) [Summary of the Invention] [Problems to be Solved by the Invention]

[0017] One object of the present invention is to provide an arc path forming part that can quickly extinguish and discharge the arc generated when the energized current is interrupted, and a DC relay including the same.

[0018] Another object of the present invention is to provide an arc path forming part that can strengthen the magnitude of the force for inducing the generated arc, and a DC relay including the same.

[0019] Still another object of the present invention is to provide an arc path forming part that can prevent damage to the components for energization by 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 part that can cause the arcs generated at a plurality of positions to proceed without meeting each other, and a DC relay including the same.

[0021] Another object of the present invention is to provide an arc path forming portion and a DC relay including the same that can achieve the above-described object without excessive design changes.

Means for Solving the Problems

[0022] 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 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 and are spaced apart from each other, but are arranged in a direction intersecting the arrangement direction of the plurality of fixed contacts, and their respective recesses are arranged to face each other. The magnet portion is arranged 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; a third magnet and a fourth magnet arranged adjacent to a surface of the second holder facing the arc chamber and extending along the surface of the second holder from one end or the other end of the second holder; and an auxiliary magnet that overlaps the center points of the plurality of fixed contacts and the moving direction of the movable contact to form a magnetic field in the arc chamber.

[0023] Further, the extension direction of the auxiliary magnet may be formed parallel to the arrangement direction of the first holder and the second holder.

[0024] Further, the extension direction of the auxiliary magnet may intersect the arrangement direction of the first holder and the second holder.

[0025] Further, the extension direction of the auxiliary magnet may intersect the shortest path between the first magnet and the third magnet.

[0026] Further, the extension direction of the auxiliary magnet may intersect the shortest path between the second magnet and the fourth magnet.

[0027] Also, the first magnet, the second magnet, the third magnet, the fourth magnet, and the auxiliary magnet may all be arranged on the same plane.

[0028] Also, the magnet portion may be arranged such that the first magnet and the third magnet face each other, and the second magnet and the fourth magnet face each other.

[0029] Also, the first magnet is arranged so as to face each other across an imaginary line connecting the center point of the plurality of fixed contacts, the second magnet, and the recesses of the first holder and the second holder, and the third magnet may be arranged so as to face each other across the imaginary line with the fourth magnet.

[0030] Also, the first magnet and the second magnet may be arranged so as to be displaced without facing the third magnet and the fourth magnet, respectively, with respect to the center point of the plurality of fixed contacts.

[0031] Also, the shortest path between the first magnet and the third magnet may overlap 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 the center point of the plurality of fixed contacts and the moving direction of the movable contact.

[0032] Also, the first magnet is arranged so as to be displaced without facing each other across an imaginary line connecting the center point of the plurality of fixed contacts, the second magnet, and the recesses of the first holder and the second holder, and the third magnet may be arranged so as to be displaced without facing each other across the imaginary line with the fourth magnet.

[0033] Further, the first magnet is arranged to face each other with the virtual line connecting the second magnet, the center points of the plurality of fixed contacts, and the recesses of the first holder and the second holder interposed therebetween, and the third magnet can be arranged to face each other with the fourth magnet with the virtual line interposed therebetween.

[0034] Further, the present invention provides 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 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 to form a magnetic field in the arc chamber. The first and second holders are each bent and extended at a predetermined angle, spaced apart from each other, but arranged 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 arranged to be 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; a third magnet and a fourth magnet arranged to be 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 or the other end of the second holder; and an auxiliary magnet that overlaps the center point of the plurality of fixed contacts and the movement direction of the movable contact to form a magnetic field in the arc chamber.

[0035] Further, the extension direction of the auxiliary magnet may be formed parallel to the arrangement direction of the first and second holders.

[0036] Further, the extension direction of the auxiliary magnet may intersect the arrangement direction of the first and second holders.

[0037] Further, the magnet portion is arranged such that the first magnet and the third magnet face each other, the second magnet and the fourth magnet face each other, the first magnet is arranged to face each other with 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, and the third magnet may be arranged to face each other with the fourth magnet across the virtual line.

[0038] Further, the first magnet and the second magnet may be arranged to be displaced without facing the third magnet and the fourth magnet respectively with reference to the center point of the plurality of fixed contacts.

[0039] Further, at least two of the first magnet, the second magnet, the third magnet, and the fourth magnet in the magnet portion may be formed in different sizes from each other.

Advantages of the Invention

[0040] Among the various effects of the present invention, the effects that can be obtained through the above-described solution means are as follows.

[0041] First, the arc path forming portion includes a magnet portion. The magnet portions each form a magnetic field inside the arc path forming portion. The formed magnetic field forms an electromagnetic force together with the current that had been applied to the fixed contacts and the movable contacts accommodated in the arc path forming portion.

[0042] 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 may be induced by the electromagnetic force.

[0043] Therefore, the generated arc can be quickly extinguished and discharged outside the arc path forming portion and the DC relay.

[0044] In addition, the magnet portion can include a plurality of magnets. The plurality of magnets are formed so as to strengthen the intensity of the electromagnetic force formed near each fixed contact. That is, by different magnets, the arc path forming portions formed near the same fixed contact are formed in the same direction as each other.

[0045] Therefore, the intensity of the magnetic field formed near each fixed contact and the intensity of the electromagnetic force depending on the intensity of the magnetic field can also be strengthened. As a result, the intensity of the electromagnetic force for inducing the generated arc is strengthened, and the generated arc can be effectively extinguished and discharged.

[0046] In addition, the direction of the magnetic field formed by the magnet portion 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 portion.

[0047] Furthermore, as described above, since the intensity of the magnetic field and the electromagnetic force are strengthened by the magnet portion, the generated arc can be quickly extinguished and moved in a direction away from the central portion.

[0048] Therefore, damage to various components provided near the central portion for the operation of the DC relay can be prevented.

[0049] In addition, in various embodiments, a plurality of fixed contacts can be provided. The magnet portion provided in the arc path forming portion forms magnetic fields in different directions near each fixed contact. Therefore, the paths of the arcs generated near each fixed contact proceed in different directions from each other.

[0050] Therefore, the arcs generated near each fixed contact do not meet each other. Along with this, malfunctions or safety accidents that may occur due to the collision of arcs generated at different positions can be prevented.

[0051] In addition, the magnet portion and the magnet holder portion are located inside the frame surrounding the arc chamber. That is, the magnet portion and the magnet holder portion are located between the inside of the frame and the outside of the arc chamber.

[0052] Therefore, no separate design change is required to arrange the magnet part and the magnet holder part outside the arc chamber.

[0053] Therefore, the arc path forming part according to various embodiments of the present invention can be provided in the DC relay without excessive design changes. Further, 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

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Mode for Carrying Out the Invention

[0055] 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.

[0056] In the following description, in order to clarify the features of the present invention, the description of some components may be omitted.

[0057] In this specification, even for different embodiments, the same reference numerals will be assigned to the same components, and duplicate descriptions thereof will be omitted.

[0058] The attached 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 attached drawings.

[0059] The singular forms include plural forms unless the context clearly dictates otherwise.

[0060] 1. Description of DC relay 1 according to an embodiment of the present invention Hereinafter, with reference to FIGS. 1 to 2, the DC relay 1 according to an embodiment of the present invention will be described.

[0061] 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. Further, the DC relay 1 includes arc path forming portions 100, 200, 300, 400.

[0062] The arc path forming portions 100, 200, 300, 400 can form a discharge path for the generated arc.

[0063] Hereinafter, with reference to the attached 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, 400 will be described in separate sections.

[0064] The arc path forming portions 100, 200, 300, 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, 400 can be applied to devices in a form that can be energized and de-energized to the outside by the contact and separation of fixed contacts and movable contacts such as electromagnetic contactors and electromagnetic switches.

[0065] (1) Description of frame part 10 The frame part 10 forms the outside of the DC relay 1. A predetermined space is formed inside the frame part 10. Various devices that perform the function of applying or cutting off the current transmitted from the outside can be accommodated in the said space. That is, the frame part 10 functions as a kind of housing 41.

[0066] In one embodiment, the frame part 10 is formed of an insulating material such as synthetic resin, and it can be prevented that the inside and outside of the frame part 10 are energized arbitrarily.

[0067] In the illustrated embodiment, the frame part 10 includes an upper frame 11, a lower frame 12, an insulating plate 13, and a support plate 14.

[0068] The upper frame 11 forms the upper side of the frame part 10. A predetermined space is formed inside the upper frame 11.

[0069] 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.

[0070] 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 is penetrated and coupled may be formed on one side of the upper frame 11.

[0071] 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.

[0072] The lower frame 12 can be coupled to the upper frame 11. The insulating plate 13 and the support plate 14 can be provided in the space between the lower frame 12 and the upper frame 11.

[0073] The insulating plate 13 is located between the upper frame 11 and the lower frame 12.

[0074] 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.

[0075] The insulating plate 13 can prevent any energization between the opening and closing part 20, the movable contact part 40, and the arc path forming parts 100, 200, 300, 400 housed inside the upper frame 11 and the core part 30 housed inside the lower frame 12.

[0076] A through hole (not shown) is formed in the central part of the insulating plate 13. The shaft 44 of the movable contact part 40 is penetrated and coupled movably in the vertical direction through the through hole.

[0077] A support plate 14 is located below the insulating plate 13.

[0078] The support plate 14 supports the lower side of the insulating plate 13.

[0079] The support plate 14 is located between the upper frame 11 and the lower frame 12.

[0080] The support plate 14 physically separates the upper frame 11 and the lower frame 12.

[0081] The support plate 14 can be formed of a magnetic material. Therefore, the support plate 14 can form a magnetic circuit together with the yoke 33. A driving force for moving the movable core 32 of the core part 30 toward the fixed core 31 can be formed by the magnetic circuit.

[0082] A through hole (not shown) is formed in the central part of the support plate 14. The shaft 44 is penetrated and coupled movably in the vertical direction through the through hole.

[0083] Therefore, when the movable core 32 is moved 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 be moved together in the same direction.

[0084] (2) Description of opening / closing part 20 The opening / closing part 20 permits or cuts off the energization of an electric current by the operation of the core part 30. Specifically, the opening / closing part 20 can permit or cut off the energization of an electric current when the fixed contact 22 and the movable contact 43 come into contact with or separate from each other.

[0085] The opening / closing part 20 is housed 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.

[0086] In the illustrated embodiment, the opening / closing part 20 includes an arc chamber 21, a fixed contact 22, and a sealing member 23.

[0087] The arc chamber 21 extinguishes an arc generated when the fixed contact 22 and the movable contact 43 are separated in the internal space. Therefore, the arc chamber 21 may be referred to as an "arc extinguishing part".

[0088] The arc chamber 21 hermetically houses the fixed contact 22 and the movable contact 43. That is, the fixed contact 22 and the movable contact 43 are housed inside the arc chamber 21. Therefore, the arc generated when the fixed contact 22 and the movable contact 43 are separated does not arbitrarily flow out to the outside.

[0089] The inside of the arc chamber 21 may be filled with an arc extinguishing gas. The arc extinguishing gas causes the generated arc to be extinguished and discharged to the outside of the DC relay 1 through a preset path. For this purpose, a communication hole (not shown) may be formed to penetrate through the wall body surrounding the internal space of the arc chamber 21.

[0090] In one embodiment, the arc chamber 21 can be formed of an insulating material. In other embodiments, the arc chamber 21 can be formed of a material having high pressure 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 can be formed of a ceramic material.

[0091] A plurality of through holes can be formed on the upper side of the arc chamber 21. A fixed contact 22 is penetrated and coupled to each of the through holes.

[0092] In the illustrated embodiment, the fixed contact 22 includes a first fixed contact 22a and a second fixed contact 22b and is provided with two. Accordingly, the through holes formed on the upper side of the arc chamber 21 can also be formed with two.

[0093] When the fixed contact 22 is penetrated and coupled to 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.

[0094] The lower side of the arc chamber 21 can be opened. An insulating plate 13 and a sealing member 23 are contacted with the lower side of the arc chamber 21. That is, the lower side of the arc chamber 21 is sealed by the insulating plate 13 and the sealing member 23.

[0095] Accordingly, the arc chamber 21 can be electrically and physically separated from the outer space of the upper frame 11.

[0096] The arc extinguished in the arc chamber 21 is discharged to the outside of the DC relay 1 through a preset path. In one embodiment, the extinguished arc can be discharged to the outside of the arc chamber 21 through the communication hole.

[0097] Outside the arc chamber 21, arc path forming units 100, 200, 300, and 400 may be provided. The arc path forming units 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.

[0098] The fixed contact 22 contacts or separates from the movable contact 43 to apply or cut off the energization between the inside and outside of the DC relay 1.

[0099] 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 contrary, when the fixed contact 22 separates from the movable contact 43, the energization between the inside and outside of the DC relay 1 is cut off.

[0100] As can be understood 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.

[0101] One end of the fixed contact 22, the upper end in the illustrated embodiment, is exposed outside the upper frame 11. A power source or a load is respectively connected to the one end so as to be energizable.

[0102] A plurality of fixed contacts 22 may be provided. In the illustrated embodiment, the fixed contact 22 includes 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.

[0103] The first fixed contact 22a is positioned so as to be offset to one side, the left side in the illustrated embodiment, from the center in the length direction of the movable contact 43. Also, the second fixed contact 22b is positioned so as to be offset to the other side, the right side in the illustrated embodiment, from the center in the length direction of the movable contact 43.

[0104] Either one of the first fixed contact 22a and the second fixed contact 22b can be connected to a power source so that electricity can be supplied. Also, the other one of the first fixed contact 22a and the second fixed contact 22b can be connected to a load so that electricity can be supplied.

[0105] The DC relay 1 according to an embodiment of the present invention can form an arc path A.P regardless of the direction of the power source or the load connected to the fixed contact 22. This is achieved by the arc path forming portions 100, 200, 300, 400, and a detailed description thereof will be given later.

[0106] The other end portion of the fixed contact 22, the lower end portion in the illustrated embodiment, extends toward the movable contact 43.

[0107] When the movable contact 43 is moved upward in the direction toward the fixed contact 22, the lower end portion in the illustrated embodiment, in the illustrated embodiment, the lower end portion comes into contact with the movable contact 43. Along with this, the inside and the outside of the DC relay 1 can be energized.

[0108] The lower end portion of the fixed contact 22 is located inside the arc chamber 21.

[0109] 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.

[0110] At this time, when 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.

[0111] The sealing member 23 blocks any communication between the arc chamber 21 and the space inside the upper frame 11.

[0112] The sealing 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 sealing member 23 is coupled to the lower side of the arc chamber 21. Also, the radially inner side of the sealing member 23 is coupled to the outer periphery of the insulating plate 13, and the lower side of the sealing member 23 is coupled to the support plate 14.

[0113] Therefore, the arc generated in the arc chamber 21 and the arc extinguished by the arc extinguishing gas do not flow out arbitrarily in the internal space of the upper frame 11.

[0114] Also, the sealing member 23 can be configured to block any communication between the internal space of the cylinder 37 and the internal space of the frame portion 10.

[0115] (3) Description of core part 30 The core portion 30 moves the movable contact portion 40 upward by applying a control power supply. Also, when the application of the control power supply is released, the core portion 30 moves the movable contact portion 40 downward again.

[0116] The core portion 30 is connected to be energizable with an external control power supply (not shown) and can receive the application of the control power supply.

[0117] The core portion 30 is located below the opening / closing portion 20. Also, the core portion 30 is housed inside the lower frame 12. The core portion 30 and the opening / closing portion 20 can be electrically and physically separated by the insulating plate 13 and the support plate 14.

[0118] A movable contact portion 40 is located between the core portion 30 and the opening / closing portion 20. The movable contact portion 40 can be moved by the driving force applied by the core portion 30. Accordingly, the movable contact 43 and the fixed contact 22 can come into contact with each other to energize the DC relay 1.

[0119] In the illustrated embodiment, the core portion 30 includes a fixed core 31, a movable core 32, a yoke 33, a bobbin 34, a coil 35, a return spring 36, and a cylinder 37.

[0120] The fixed core 31 is magnetized by the magnetic field generated by the coil 35 to generate an electromagnetic repulsive force. Due to the electromagnetic repulsive force, the movable core 32 is moved in a direction away from the fixed core 31.

[0121] 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.

[0122] The fixed core 31 can be provided in any form that can be magnetized by a magnetic field to generate an electromagnetic force. In one embodiment, the fixed core 31 can be provided with a permanent magnet or an electromagnet, etc.

[0123] The fixed core 31 partially accommodates the lower side of the cylinder 37. Also, the inner circumference of the fixed core 31 is in contact with the outer circumference of the cylinder 37.

[0124] 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.

[0125] When a control power supply is applied, the movable core 32 is moved in a direction away from the fixed core 31 by the electromagnetic repulsive force generated by the fixed core 31.

[0126] Due to the movement of the movable core 32, the shaft 44 coupled to the movable core 32 is moved in a direction away from the fixed core 31, upward in the illustrated embodiment. Also, when the shaft 44 is moved, the movable contact portion 40 coupled to the shaft 44 is also moved upward.

[0127] Accordingly, the fixed contact 22 and the movable contact 43 come into contact with each other, and the DC relay 1 can be energized with an external power supply or load.

[0128] The movable core 32 can be provided in any form that can receive a repulsive force due to an electromagnetic force. In one embodiment, the movable core 32 can be formed of a magnetic material or can be provided with a permanent magnet or an electromagnet, etc.

[0129] The movable core 32 is accommodated inside the cylinder. Further, the movable core 32 can be moved in the longitudinal direction of the cylinder 37, in the vertical direction in the illustrated embodiment, inside the cylinder 37.

[0130] Specifically, the movable core 32 can be moved in the direction toward the fixed core 31 and in the direction away from the fixed core 31.

[0131] The movable core 32 is coupled to the shaft 44. The movable core 32 can be moved integrally with the shaft 44. When the movable core 32 is moved upward or downward, the shaft 44 is also moved upward or downward. Accordingly, the movable contact 43 is also moved upward or downward.

[0132] 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 may be defined as the distance by which the movable core 32 can be moved in the vertical direction.

[0133] The movable core 32 is formed to extend in the longitudinal direction. Inside the movable core 32, a hollow portion extending in the longitudinal direction is recessed by a predetermined distance. The return spring 36 and the lower side of the shaft 44 penetratingly coupled to the return spring 36 are partially accommodated in the hollow portion.

[0134] 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.

[0135] 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.

[0136] The yoke 33 forms a magnetic path when a control power supply is applied. The magnetic path formed by the yoke 33 can be configured to adjust the direction of the magnetic field formed by the coil 35.

[0137] Accordingly, when a control power supply is applied, the coil 35 can generate a magnetic field such that the movable core 32 moves away from the fixed core 31.

[0138] In one embodiment, the yoke 33 can be formed of an electrically conductive material that can be energized.

[0139] The yoke 33 is housed inside the lower frame 12. The yoke 33 surrounds the coil 35. The coil 35 can 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.

[0140] The upper side of the yoke 33 is contacted with the support plate 14. Also, the outer periphery of the yoke 33 can be in contact with the inner periphery of the lower frame 12 or can be positioned so as to be separated from the inner periphery of the lower frame 12 by a predetermined distance.

[0141] The coil 35 is wound around the bobbin 34.

[0142] The bobbin 34 is housed inside the yoke 33.

[0143] The bobbin 34 can include a flat upper portion and a lower portion, and a cylindrical column portion that is formed to extend in the length direction and connects the upper portion and the lower portion. That is, the bobbin 34 is in the shape of a bobbin.

[0144] The upper portion of the bobbin 34 is contacted with the lower side of the support plate 14. The coil 35 is wound around the column portion of the bobbin 34. The thickness around which the coil 35 is wound can be the same as or smaller than the diameters of the upper portion and the lower portion of the bobbin 34.

[0145] A hollow portion extending in the longitudinal direction is formed through the column portion of the bobbin 34. A cylinder 37 can be accommodated in the hollow portion. The column portion of the bobbin 34 can be arranged to have a central axis such as the fixed core 31, the movable core 32, and the shaft 44.

[0146] 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.

[0147] 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 accommodated inside the yoke 33.

[0148] When the control power supply is applied, the coil 35 generates a magnetic field. At this time, the intensity or direction of the magnetic field generated by the coil 35 can be controlled by the yoke 33. The fixed core 31 can be magnetized by the magnetic field generated by the coil 35.

[0149] When the fixed core 31 is magnetized, the movable core 32 receives an electromagnetic force, that is, a repulsive force, in a direction away from the fixed core 31. Along with this, the movable core 32 is moved upward in the illustrated embodiment in a direction toward the fixed core 31.

[0150] 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 a direction away from the fixed core 31.

[0151] The return spring 36 is compressed as the movable core 32 is moved toward the fixed core 31 to store 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.

[0152] When the application of the control power supply is released, the movable core 32 will receive 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. Along with this, the movable core 32 can be moved in a direction away from the fixed core 31 and restored to its original position.

[0153] The return spring 36 can be provided in any form that can store the restoring force by deforming its shape and transmit the restoring force to the outside while returning to its original shape. In one embodiment, the return spring 36 can be provided as a coil 35 spring.

[0154] A shaft 44 is penetrated and coupled to the return spring 36. The shaft 44 can be moved in the vertical direction regardless of the shape deformation of the return spring 36 in a state where the return spring 36 is coupled.

[0155] The return spring 36 is accommodated in a hollow portion formed by being recessed on the upper side of the movable core 32.

[0156] 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 be moved in the upper and lower directions inside the cylinder 37.

[0157] 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 is in contact with the inner peripheral surface of the column portion of the bobbin 34.

[0158] The upper end portion of the cylinder 37 is in contact with the lower surface of the support plate 14. The lower surface of the cylinder 37 can be in contact with the fixed core 31.

[0159] (4) Description of movable contact part 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 supply or load.

[0160] The movable contact part 40 is accommodated in the internal space of the upper frame 11. Further, the movable contact part 40 is accommodated in the arc chamber 21 so as to be vertically movable therein.

[0161] A fixed contact 22 is located above the movable contact part 40. The movable contact part 40 is accommodated in the arc chamber 21 so as to be movable in a direction toward the fixed contact 22 and in a direction away from the fixed contact 22.

[0162] A core part 30 is located below the movable contact part 40. The movement of the movable contact part 40 can be achieved by the movement of the movable core 32.

[0163] 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.

[0164] The housing 41 accommodates the movable contact 43 and the elastic part 45 that elastically supports the movable contact 43.

[0165] In the illustrated embodiment, the housing 41 has one side and the other side opposite thereto open. The movable contact 43 can be inserted therethrough into the open portion. The non-open side surface of the housing 41 can be configured to surround the accommodated movable contact 43.

[0166] A cover 42 is provided above the housing 41.

[0167] The cover 42 covers the upper surface of the movable contact 43 accommodated in the housing 41.

[0168] 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 can be formed of a synthetic resin or the like.

[0169] 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.

[0170] The housing 41 and the cover 42 can be coupled by any member. In one embodiment, the housing 41 and the cover 42 can be coupled by fastening members (not shown) such as bolts and nuts.

[0171] The movable contact 43 contacts the fixed contact 22 by applying a control power supply so that the DC relay 1 is energized with an external power supply and load. Also, when the application of the control power supply is released, the movable contact 43 is separated from the fixed contact 22 so that the DC relay 1 is not energized with the external power supply and load.

[0172] The movable contact 43 is positioned adjacent to the fixed contact 22.

[0173] 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 be in contact with the lower surface of the cover 42.

[0174] The lower side of the movable contact 43 is elastically supported by the elastic portion 45. The elastic portion 45 can elastically support the movable contact 43 in a state where it is compressed by a predetermined distance so that the movable contact 43 does not move arbitrarily downward.

[0175] The movable contact 43 is formed to extend 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. Therefore, both end portions in the longitudinal direction of the movable contact 43 accommodated in the housing 41 are exposed outside the housing 41.

[0176] Contact protrusions can be formed to protrude upward by a predetermined distance from both side end portions. The fixed contact 22 is contacted with the contact protrusions.

[0177] The contact protrusion may be formed at a position corresponding to each fixed contact 22. Accordingly, the moving distance of the movable contact 43 may be decreased, and the contact reliability between the fixed contact 22 and the movable contact 43 may be improved.

[0178] The width of the movable contact 43 may be the same as the distance at which the side surfaces of the housing 41 are separated from each other. That is, when the movable contact 43 is accommodated in the housing 41, both side surfaces in the width direction of the movable contact 43 may be brought into contact with the inner surfaces of the side surfaces of the housing 41. Accordingly, the state in which the movable contact 43 is accommodated in the housing 41 may be stably maintained.

[0179] The shaft 44 transmits the driving force generated by the operation of the core portion 30 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 is moved upward or downward, the movable contact 43 may also be moved upward or downward by the shaft 44.

[0180] The shaft 44 is formed to extend in the length direction, in the vertical direction in the illustrated embodiment.

[0181] The lower end portion of the shaft 44 is inserted and coupled to the movable core 32. When the movable core 32 is moved in the vertical direction, the shaft 44 may be moved in the vertical direction together with the movable core 32.

[0182] A return spring 36 is penetrated and coupled to the body portion of the shaft 44.

[0183] The upper end portion of the shaft 44 is coupled to the housing 41. When the movable core 32 is moved, the shaft 44 and the housing 41 may be moved together.

[0184] 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. Accordingly, the shaft 44 can stably maintain a coupled state with the housing 41 and the movable core 32.

[0185] The elastic part 45 elastically supports the movable contact 43. When the movable contact 43 contacts the fixed contact 22, the movable contact 43 tends to separate from the fixed contact 22 due to the electromagnetic repulsive force. At this time, the elastic part 45 elastically supports the movable contact 43 to prevent the movable contact 43 from separating from the fixed contact 22 arbitrarily.

[0186] The elastic part 45 stores the restoring force by deforming its shape and can be provided in any form that can provide the stored restoring force to other members. In one embodiment, the elastic part 45 can be provided as a coil 35 spring.

[0187] One side end of the elastic part 45 facing the movable contact 43 is contacted below the movable contact 43. Also, the other side end facing the one side end is contacted above the housing 41.

[0188] The elastic part 45 can elastically support the movable contact 43 in a state where it is compressed by a predetermined distance to store the restoring force. Accordingly, even if an electromagnetic repulsive force is generated between the movable contact 43 and the fixed contact 22, the movable contact 43 will not move arbitrarily.

[0189] For stable connection of the elastic part 45, a protruding part (not shown) inserted into the elastic part 45 may protrude from below the movable contact 43. Similarly, a protruding part (not shown) inserted into the elastic part 45 may also protrude from above the housing 41.

[0190] 2. Description of arc path forming part 100 according to the first embodiment of the present invention Hereinafter, with reference to FIGS. 3 to 14, the arc path forming part 100 according to the first embodiment of the present invention will be described.

[0191] The arc path forming part 100 forms a magnetic field inside the arc chamber 21. Due to the current applied to the DC relay 1 and the formed magnetic field, an electromagnetic force is formed inside the arc chamber 21.

[0192] When the fixed contact 22 and the movable contact 43 are separated, the arc generated is moved outside the arc chamber 21 by the formed electromagnetic force. Specifically, the generated arc is moved along the direction of the formed electromagnetic force. Therefore, it can be said that the arc path forming portion 100 forms the arc path A.P, which is the path along which the generated arc flows.

[0193] The arc path forming portion 100 is located in the space formed inside the upper frame 11. The arc path forming portion 100 is arranged so as to surround the arc chamber 21. That is, the arc chamber 21 is located inside the arc path forming portion 100.

[0194] The fixed contact 22 and the movable contact 43 are located inside the arc path forming portion 100. The arc generated by the separation of the fixed contact 22 and the movable contact 43 can be induced by the electromagnetic force formed by the arc path forming portion 100.

[0195] The arc path forming portion 100 according to this embodiment includes a magnet holder portion 110, a magnet portion 120, and an auxiliary magnet 130.

[0196] 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.

[0197] The magnet holder portion 110 is arranged outside the arc chamber 21 and inside the upper frame 11.

[0198] The fixed contact 22 and the movable contact 43 are located radially inside the magnet holder portion 110. 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.

[0199] The central portion C is located between the first fixed contact 22a and the second fixed contact 22b. Also, the central portion of the movable contact portion 40 is located vertically below the central portion C. That is, vertically below the central portion C, the central portions of the housing 41, the cover 42, the movable contact 43, the shaft 44, the elastic portion 45, etc. are located.

[0200] 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 thereof will be described later together with the description of the magnet portion 120.

[0201] 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 to the same polarity as a plurality of adjacent magnets.

[0202] The magnet holder portion 110 can include a plurality of holders. Each holder can be coupled to a plurality of magnets. In one embodiment, a plurality of magnets attached to one holder are all magnetized to the same polarity.

[0203] 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.

[0204] The first holder 111 and the second holder 112 are arranged so as to be separated 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.

[0205] 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.

[0206] 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.

[0207] 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. Accordingly, 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.

[0208] The first holder 111 and the second holder 112 are arranged such that the recessed portions of each bent portion face each other with the center C of the fixed contact 22 and the movable contact 43 therebetween.

[0209] Also, the first holder 111 and the second holder 112 are formed in corresponding shapes. 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 center C of a plurality of fixed contacts 22 and movable contacts 43.

[0210] The first holder 111 includes a first outer surface 111a and a first inner surface 111b.

[0211] The first outer surface 111a is located on one surface of the first holder 111 that is opposite to the fixed contact 22 and the movable contact 43. Also, the first outer surface 111a is arranged to be 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.

[0212] The first inner surface 111b is located on the other surface of the first holder 111 that is opposite to the first outer surface 111a. Also, the first inner surface 111b is arranged to face the outer peripheral surface of the arc chamber 21 with the first magnet 121 and the second magnet 122 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.

[0213] The first inner surface 111b is coupled to the first magnet 121 and the second magnet 122 of the magnet portion 120 described later.

[0214] The second holder 112 includes a second outer surface 112a and a second inner surface 112b.

[0215] 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. Also, the second outer surface 112a is arranged to be 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.

[0216] The second inner surface 112b is located on the other surface of the second holder 112 opposite to the second outer surface 112a. Also, the second inner surface 112b is arranged to face 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.

[0217] The second inner surface 112b is coupled to the third magnet 123 and the fourth magnet 124 of the magnet portion 120 described later.

[0218] 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. Also, 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 arranged such that its center corresponds to the center portion C of the fixed contact 22 and the movable contact 43.

[0219] The magnet portion 120 can form a magnetic field by itself and also between each other. The magnetic field formed by the magnet portion 120 forms an electromagnetic force together with the current flowing through the fixed contact 22 and the movable contact 43. The formed electromagnetic force induces an arc generated when the fixed contact 22 and the movable contact 43 are separated.

[0220] At this time, the arc path forming unit 100 forms an electromagnetic force in a direction away from the center C of the fixed contact 22 and the movable contact 43. Along with this, the arc path A.P is also formed in a direction away from the center C of the fixed contact 22 and the movable contact 43.

[0221] As a result, each component provided in the DC relay 1 will not be damaged by the arc generated. Further, the generated arc can be quickly discharged to the outside of the arc chamber 21.

[0222] 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) may be provided for coupling the magnet part 120 to the inner surfaces 111b and 112b of the magnet holder part 110.

[0223] The magnet part 120 can include a plurality of magnets.

[0224] In this embodiment, the magnet part 120 includes a total of four magnets such as a first magnet 121, a second magnet 122, a third magnet 123, and a fourth magnet 124.

[0225] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 can each be magnetized and provided in any form capable of forming 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 to have polarities in the width direction.

[0226] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are arranged so as to be separated 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. Also, 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.

[0227] The first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 can be in contact with or fixedly coupled to the outer peripheral surface of the arc chamber 21. Accordingly, 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.

[0228] In one embodiment, the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 can 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 can be formed in shapes such that their widths and the lengths in the width direction respectively correspond to each other.

[0229] The first magnet 121 is coupled to the first inner surface 111b of the first holder 111. Also, the first magnet 121 extends from one end of the first holder 111 along the first inner surface 111b. In one embodiment, the first magnet 121 is formed in a shape corresponding to the first inner surface 111b of the first holder 111.

[0230] The first magnet 121 includes a first opposing surface 121a and a first opposite surface 121b.

[0231] The first opposing 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. Also, the first opposing surface 121a is arranged to be adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the first opposing surface 121a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0232] The first opposite surface 121b is located on the other surface of the first magnet 121 opposite to the first opposing surface 121a. Also, the first opposite surface 121b is arranged 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.

[0233] The second magnet 122 is coupled to the first inner surface 111b of the first holder 111. Further, the second magnet 122 extends along the first inner surface 111b from the other end of the first holder 111 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.

[0234] The extending direction of the second magnet 122 intersects the extending direction of the first magnet 121. This is due to the first holder 111 coupled to the first magnet 121 and the second magnet 122 being bent and extending at a predetermined angle.

[0235] The second magnet 122 is arranged 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.

[0236] The second magnet 122 includes a second opposing surface 122a and a second opposite surface 122b.

[0237] The second opposing 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 opposing surface 122a is arranged to be adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the second opposing surface 122a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0238] The second opposite surface 122b is located on the other surface of the second magnet 122 opposite to the second opposing surface 122a. Also, the second opposite surface 122b is arranged to face 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.

[0239] 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 toward the second magnet 122 of the second holder 112. 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.

[0240] 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.

[0241] The third magnet 123 includes a third facing surface 123a and a third opposite surface 123b.

[0242] 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 arranged so as to be 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.

[0243] 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 arranged so as to face 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.

[0244] The fourth magnet 124 is coupled to the second inner surface 112b of the second holder 112. Also, the fourth magnet 124 extends along the second inner surface 112b from the other end of the second holder 112 opposite to the third magnet 123 toward the first magnet 121. 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.

[0245] The fourth magnet 124 has an extension direction that intersects the extension direction of the third magnet 123. This is due to the fact that the second holder 112 combined with the third magnet 123 and the fourth magnet 124 is bent and extended at a predetermined angle.

[0246] The fourth magnet 124 is arranged so as to be displaced without facing the third magnet 123 across an imaginary line connecting the central portion C of the fixed contact 22 and the movable contact 43 and the recesses of the first holder 111 and the second holder 112.

[0247] 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.

[0248] In one embodiment, the shortest distance between the third magnet 123 and the fourth magnet 124 is formed to be the same as the shortest distance between the first magnet 121 and the second magnet 122.

[0249] The fourth magnet 124 includes a fourth facing surface 124a and a fourth opposite surface 124b.

[0250] The fourth facing surface 124a is located on one surface of the fourth magnet 124 facing the central portion C of the fixed contact 22 and the movable contact 43. Also, the fourth facing surface 124a is arranged to be adjacent to the outer peripheral surface of the arc chamber 21. In one embodiment, the fourth facing surface 124a is formed in a shape corresponding to the outer peripheral surface of the arc chamber 21.

[0251] The fourth opposite surface 124b is located on the other surface of the fourth magnet 124 opposite to the fourth facing surface 124a. Also, the fourth opposite surface 124b is arranged to face the inner peripheral surface of the upper frame 11 with the second holder 112 interposed therebetween. In one embodiment, the fourth opposite surface 124b is formed in a shape corresponding to the inner peripheral surface of the upper frame 11.

[0252] In one embodiment, the opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized to the same polarity. The opposing surfaces 121b, 122b, 123b, and 124b of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are magnetized to polarities opposite to those of the respective opposing surfaces 121a, 122a, 123a, and 124a, and are similarly all magnetized to the same polarity.

[0253] In other embodiments, the opposing surfaces 121a and 122a of the first magnet 121 and the second magnet 122 are magnetized to one of the polarities of the N pole and the S pole, and the opposing surfaces 123a and 124a of the third magnet 123 and the fourth magnet 124 are magnetized to the other one of the polarities of the N pole and the S pole.

[0254] Also, the shortest distances from the opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 to the center C of the fixed contact 22 and the movable contact 43 can all be formed to be the same.

[0255] 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.

[0256] The auxiliary magnet 130 forms a magnetic field inside the arc chamber 21 in which the fixed contact 22 and the movable contact 43 are accommodated.

[0257] The auxiliary magnet 130 is located radially inside the magnet holder portion 110. That is, the auxiliary magnet 130 is located between the first holder 111 and the second holder 112. In one embodiment, the auxiliary magnet 130 can be arranged on the same plane as the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124.

[0258] The auxiliary magnet 130 overlaps with the central part C of the fixed contact 22 and the movable contact 43 in the moving direction of the movable contact 43. In the illustrated embodiment, the auxiliary magnet 130 is arranged such that its center corresponds to the central part C of the fixed contact 22 and the movable contact 43.

[0259] The auxiliary magnet 130 can form a magnetic field by itself and in relation to the magnet part 120. The magnetic field formed by the auxiliary magnet 130 forms an electromagnetic force together with the current flowing through 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.

[0260] The auxiliary magnet 130 extends in a direction parallel to the arrangement direction of the first holder 111 and the second holder 112.

[0261] In one embodiment, the auxiliary magnet 130 can extend in a direction intersecting the shortest path between the first magnet 121 and the third magnet 123. In another embodiment, the auxiliary magnet 130 can extend in a direction intersecting the shortest path between the second magnet 122 and the fourth magnet 124.

[0262] In one embodiment, the shortest distances from 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 to the center of the auxiliary magnet 230 can all be formed to be the same.

[0263] In the illustrated embodiment, the auxiliary magnet 130 is formed to have polarities in the width direction.

[0264] The auxiliary magnet 130 includes a first surface 131 and a second surface 132.

[0265] The first surface 131 is located on one side of the auxiliary magnet 130 facing the first magnet 121 and the fourth magnet 124. Also, the second surface 132 is located on the other side of the auxiliary magnet 130 opposite to the first surface 131. It can be understood that the first surface 131 and the second surface 132 are formed on different surfaces of one auxiliary magnet 130 and are magnetized with opposite polarities.

[0266] Referring to FIGS. 3 to 5, the opposing surfaces 121a, 122a, 123a, and 124a of the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124 are all magnetized to the N pole, and the opposite surfaces 121b, 122b, 123b, and 124b are all magnetized to the S pole. Accordingly, a magnetic field in the 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.

[0267] Also, the first surface 131 of the auxiliary magnet 130 is magnetized to the N pole, and the second surface 132 is magnetized to the S pole. Accordingly, a magnetic field in the direction of pushing each other is formed between the first surface 131 of the auxiliary magnet 130 and the first opposing surface 121a of the first magnet 121 and the fourth opposing surface 124a of the fourth magnet 124. Conversely, a magnetic field in the direction from the second opposing surface 122a and the third opposing surface 123a toward the second surface 132 is formed between the second surface 132 of the auxiliary magnet 130 and the second opposing surface 122a of the second magnet 122 and the third opposing surface 123a of the third magnet 123.

[0268] Also, the first holder 111 and the second holder 112 are also magnetized by the magnet portion 120 together to form an accompanying magnetic field.

[0269] In the embodiment illustrated 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.

[0270] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0271] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with 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. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper left side.

[0272] In the embodiment illustrated 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.

[0273] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with 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. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed to the lower left side.

[0274] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed to the upper right side. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper right side.

[0275] 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 to the S pole, and the opposing surfaces 121b, 122b, 123b, 124b are all magnetized to the N pole. Along with this, a magnetic field in the mutually pushing-out direction is formed between the first magnet 121, the second magnet 122, the third magnet 123, and the fourth magnet 124.

[0276] Further, the first surface 131 of the auxiliary magnet 130 is magnetized to the N pole, and the second surface 132 is magnetized to the S pole. Accordingly, a magnetic field is formed between the first surface 131 of the auxiliary magnet 130 and the first opposing surface 121a of the first magnet 121 and the fourth opposing surface 124a of the fourth magnet 124 in a direction from the first surface 131 toward the first opposing surface 121a and the fourth opposing surface 124a. Conversely, a magnetic field in a direction of pushing each other out is formed between the second surface 132 of the auxiliary magnet 130 and the second opposing surface 122a of the second magnet 122 and the third opposing surface 123a of the third magnet 123.

[0277] Also, the first holder 111 and the second holder 112 are both magnetized by the magnet portion 120 to form an accompanying magnetic field.

[0278] In the embodiment illustrated in FIG. 7, 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.

[0279] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0280] 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 right side. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper right side.

[0281] In the embodiment illustrated in FIG. 8, 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.

[0282] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field using the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the right. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the right.

[0283] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field using the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed upward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0284] Referring to FIGS. 9 to 11, all of the opposing surfaces 121a and 122a of the first magnet 121 and the second magnet 122 are magnetized to the N pole, and all of the opposing surfaces 123a and 124a of the third magnet 123 and the fourth magnet 124 are magnetized to the S pole.

[0285] Along with this, magnetic fields in the direction of 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, between the first magnet 121 and the third magnet 123 and the fourth magnet 124, a magnetic field in the direction from the first magnet 121 toward the third magnet 123 and the fourth magnet 124 is formed. Also, between the second magnet 122 and the third magnet 123 and the fourth magnet 124, a magnetic field in the direction from the second magnet 122 toward the third magnet 123 and the fourth magnet 124 is formed.

[0286] Also, the first surface 131 of the auxiliary magnet 130 is magnetized to the N pole, and the second surface 132 is magnetized to the S pole. Along with this, magnetic fields in the direction of pushing each other are formed between the first surface 131 of the auxiliary magnet 130 and the first opposing surface 121a of the first magnet 121 and between the second surface 132 of the auxiliary magnet 130 and the third opposing surface 123a of the third magnet 123.

[0287] Conversely, a magnetic field in the direction toward the second opposing surface 122a is formed between the first surface 131 of the auxiliary magnet 130 and the second opposing surface 122a of the second magnet 122. Also, a magnetic field in the direction toward the second surface 132 is formed between the second surface 132 of the auxiliary magnet 130 and the fourth opposing surface 124a of the fourth magnet 124.

[0288] Also, the first holder 111 and the second holder 112 are both magnetized by the magnet portion 120 to form an accompanying magnetic field.

[0289] In the embodiment illustrated in FIG. 10, 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.

[0290] 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 downward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0291] 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 upward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0292] In the embodiment illustrated 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.

[0293] 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 upward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed upward to the right.

[0294] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed downward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed downward to the right.

[0295] Referring to FIGS. 12 to 14, the opposing surfaces 121a and 122a of the first magnet 121 and the second magnet 122 are all magnetized to the N pole, and the opposing surfaces 123a and 124a of the third magnet 123 and the fourth magnet 124 are all magnetized to the S pole.

[0296] Along with this, magnetic fields in the direction of 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. On the contrary, between the first magnet 121 and the third magnet 123 and the fourth magnet 124, a magnetic field in the direction from the first magnet 121 toward the third magnet 123 and the fourth magnet 124 is formed. Also, between the second magnet 122 and the third magnet 123 and the fourth magnet 124, a magnetic field in the direction from the second magnet 122 toward the third magnet 123 and the fourth magnet 124 is formed.

[0297] Also, the first surface 131 of the auxiliary magnet 130 is magnetized to the S pole, and the second surface 132 is magnetized to the N pole. Along with this, magnetic fields in the direction of pushing each other are formed between the first surface 131 of the auxiliary magnet 130 and the fourth opposing surface 124a of the fourth magnet 124 and between the second surface 132 of the auxiliary magnet 130 and the second opposing surface 122a of the second magnet 122.

[0298] On the contrary, between the first surface 131 of the auxiliary magnet 130 and the first opposing surface 121a of the first magnet 121, a magnetic field in the direction toward the first surface 131 is formed. Also, between the second surface 132 of the auxiliary magnet 130 and the third opposing surface 123a of the third magnet 123, a magnetic field in the direction toward the third opposing surface 123a is formed.

[0299] Also, the first holder 111 and the second holder 112 are both magnetized by the magnet portion 120 to form an accompanying magnetic field.

[0300] In the embodiment illustrated in FIG. 13, 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.

[0301] 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 downward to the left. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the left.

[0302] 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 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.

[0303] In the embodiment illustrated in FIG. 14, 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.

[0304] 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 upward to the right. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed upward to the right.

[0305] 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 downward to the left. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed downward to the left.

[0306] Therefore, regardless of the polarity of the magnet part 120 or the direction of the current applied to the DC relay, the arc path forming part 100 according to this embodiment can form the electromagnetic force and the arc path A.P in the direction away from the central part C.

[0307] Accordingly, damage to each component of the DC relay 1 arranged adjacent to the central part 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.

[0308] 3. Description of arc path forming part 200 according to the second embodiment of the present invention Hereinafter, the arc path forming part 200 according to the second embodiment of the present invention will be described with reference to FIGS. 15 to 26.

[0309] The arc path forming part 200 according to this embodiment includes a magnet holder part 210, a magnet part 220, and an auxiliary magnet 230.

[0310] The magnet holder part 210 and the auxiliary magnet 230 according to this embodiment have the same structure and function as the magnet holder part 110 and the auxiliary magnet 130 according to the above-described embodiment. However, the magnet part 220 according to this embodiment is different from the magnet part 120 according to the above-described embodiment in that the first magnet 221 and the third magnet 223 are arranged so as to face 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 between the second magnet 222 and the fourth magnet 224.

[0311] Therefore, the description of the magnet holder part 210 and the auxiliary magnet 230 will be replaced with the description of the magnet holder part 110 and the auxiliary magnet 130 according to the above-described embodiment, and the magnet part 220 will be described centering on the differences from the magnet part 120 according to the above-described embodiment.

[0312] The magnet part 220 according to this embodiment includes a first magnet 221, a second magnet 222, a third magnet 223, and a fourth magnet 224.

[0313] The first magnet 221 is arranged to face each other across an imaginary line connecting the second magnet 222, the fixed contact 22, the central portion C of the movable contact 43, and the recesses of the first holder 211 and the second holder 212.

[0314] The third magnet 223 is arranged to face each other across an imaginary line connecting the fourth magnet 224, the fixed contact 22, the central portion C of the movable contact 43, and the recesses of the first holder 211 and the second holder 212.

[0315] 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 can all be formed to be the same.

[0316] 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 to the N pole, and the opposing surfaces 221b, 222b, 223b, 224b are all magnetized to the S pole. Accordingly, 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.

[0317] Also, the first surface 231 of the auxiliary magnet 230 is magnetized to the N pole, and the second surface 232 is magnetized to the S pole. Accordingly, a magnetic field in the direction of pushing each other is formed between the first surface 231 of the auxiliary magnet 230 and the first opposing surface 221a of the first magnet 221 and the fourth opposing surface 224a of the fourth magnet 224. Conversely, between the second surface 232 of the auxiliary magnet 230 and the second opposing surface 222a of the second magnet 222 and the third opposing surface 223a of the third magnet 223, a magnetic field in the direction from the second opposing surface 222a and the third opposing surface 223a toward the second surface 232 is formed.

[0318] Also, the first holder 211 and the second holder 212 and the magnet portion 220 are magnetized together to form an accompanying magnetic field.

[0319] In the embodiment illustrated in FIG. 16, 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.

[0320] 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 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.

[0321] 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 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.

[0322] In the embodiment illustrated in FIG. 17, 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.

[0323] 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 downward to the left. Accordingly, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the left.

[0324] 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 upward to the left. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the left.

[0325] Referring to FIGS. 18 to 20, the opposing surfaces 221a, 222a, 223a, and 224a of the first magnet 221, the second magnet 222, the third magnet 223, and the fourth magnet 224 are all magnetized to the S pole, and the opposing surfaces 221b, 222b, 223b, and 224b are all magnetized to the N pole. Accordingly, 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.

[0326] Also, the first surface 231 of the auxiliary magnet 230 is magnetized to the N pole, and the second surface 232 is magnetized to the S pole. Accordingly, a magnetic field in the direction from the first surface 231 toward the first opposing surface 221a and the fourth opposing surface 224a is formed between the first surface 231 of the auxiliary magnet 230 and the first opposing surface 221a of the first magnet 221 and the fourth opposing surface 224a of the fourth magnet 224. Conversely, a magnetic field in the direction of pushing each other is formed between the second surface 232 of the auxiliary magnet 230 and the second opposing surface 222a of the second magnet 222 and the third opposing surface 223a of the third magnet 223.

[0327] Also, the first holder 211 and the second holder 212 and the magnet portion 220 are magnetized together to form an accompanying magnetic field.

[0328] In the embodiment illustrated in FIG. 19, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0329] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0330] 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. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper left side.

[0331] In the embodiment illustrated in FIG. 20, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed downward to the left. Accordingly, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the left.

[0332] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with 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.

[0333] Referring to FIGS. 21 to 23, all of the opposing surfaces 221a and 222a of the first magnet 221 and the second magnet 222 are magnetized to the N pole, and all of the opposing surfaces 223a and 224a of the third magnet 223 and the fourth magnet 224 are magnetized to the S pole.

[0334] Accordingly, a magnetic field in a direction of pushing each other is 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, a magnetic field in a direction from the first magnet 221 toward the third magnet 223 and the fourth magnet 224 is formed between the first magnet 221 and the third magnet 223 and the fourth magnet 224. Also, a magnetic field in a direction from the second magnet 222 toward the third magnet 223 and the fourth magnet 224 is formed between the second magnet 222 and the third magnet 223 and the fourth magnet 224.

[0335] Also, the first surface 231 of the auxiliary magnet 230 is magnetized to the N pole, and the second surface 232 is magnetized to the S pole. Accordingly, a magnetic field in a direction of pushing each other is formed between the first surface 231 of the auxiliary magnet 230 and the first opposing surface 221a of the first magnet 221 and between the second surface 232 of the auxiliary magnet 230 and the third opposing surface 223a of the third magnet 223.

[0336] On the contrary, a magnetic field in the direction toward the second opposing surface 222a is formed between the first surface 231 of the auxiliary magnet 230 and the second opposing surface 222a of the second magnet 222. Also, a magnetic field in the direction toward the second surface 232 is formed between the second surface 232 of the auxiliary magnet 230 and the fourth opposing surface 224a of the fourth magnet 224.

[0337] Also, the first holder 211, the second holder 212, and the magnet unit 220 are magnetized together to form an accompanying magnetic field.

[0338] In the embodiment illustrated in FIG. 22, 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.

[0339] 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 downward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0340] 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 upward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0341] In the embodiment illustrated in FIG. 23, 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.

[0342] 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 upward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed upward to the right.

[0343] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed downward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed downward to the right.

[0344] Referring to FIGS. 24 to 26, all of the opposing surfaces 221a and 222a of the first magnet 221 and the second magnet 222 are magnetized to the N pole, and all of the opposing surfaces 223a and 224a of the third magnet 223 and the fourth magnet 224 are magnetized to the S pole.

[0345] Along with this, 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. Conversely, 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.

[0346] Also, the first surface 231 of the auxiliary magnet 230 is magnetized to the S pole, and the second surface 232 is magnetized to the N pole. Along with this, magnetic fields in directions pushing each other are formed between the first surface 231 of the auxiliary magnet 230 and the fourth opposing surface 224a of the fourth magnet 224 and between the second surface 232 of the auxiliary magnet 230 and the second opposing surface 222a of the second magnet 222.

[0347] Conversely, between the first surface 231 of the auxiliary magnet 230 and the first opposing surface 221a of the first magnet 221, a magnetic field in a direction toward the first surface 231 is formed. Also, between the second surface 232 of the auxiliary magnet 230 and the third opposing surface 223a of the third magnet 223, a magnetic field in a direction toward the third opposing surface 223a is formed.

[0348] Also, the first holder 211 and the second holder 212 and the magnet part 220 are magnetized together to form an accompanying magnetic field.

[0349] In the embodiment illustrated in FIG. 25, 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.

[0350] When applying Fleming's left-hand rule considering 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 downward. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed downward.

[0351] Similarly, when applying Fleming's left-hand rule considering 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 upward. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed upward.

[0352] In the embodiment illustrated in FIG. 26, 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.

[0353] When applying Fleming's left-hand rule considering 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 upward and to the right. Accordingly, the arc path A.P near the first fixed contact 22a is formed to be directed upward and to the right.

[0354] Similarly, when applying Fleming's left-hand rule considering 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 downward and to the left. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed downward and to the left.

[0355] Therefore, regardless of the polarity of the magnet portion 220 or the direction of the current applied to the DC relay, 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.

[0356] Accordingly, damage to each component of the DC relay 1 arranged adjacent to the central portion C can be prevented. Further, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0357] 4. Description of arc path forming part 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. 27 to 38.

[0358] The arc path forming portion 300 according to the present embodiment includes a magnet holder portion 310, a magnet portion 320, and an auxiliary magnet 330.

[0359] The magnet holder portion 310 and the magnet portion 320 according to the present embodiment have the same structure and function as the magnet holder portion 110 and the magnet portion 120 according to the first embodiment described above. However, the auxiliary magnet 330 according to the present embodiment is different from the auxiliary magnet 130 according to the first embodiment in that the extension direction thereof intersects the arrangement direction of the first holder 311 and the second holder 312.

[0360] Therefore, the description of the magnet holder portion 310 and the magnet portion 320 will be replaced with the description of the magnet holder portion 110 and the magnet portion 120 according to the first embodiment described above, and the auxiliary magnet 330 will be described centering on the differences from the auxiliary magnet 130 according to the first embodiment.

[0361] The auxiliary magnet 330 according to the present embodiment is located radially inside the magnet holder portion 310. That is, the auxiliary magnet 330 is located between the first holder 311 and the second holder 312. At this time, the auxiliary magnet 330 extends in a direction intersecting the arrangement direction of the first holder 311 and the second holder 312.

[0362] In the illustrated embodiment, the auxiliary magnet 330 is formed to have polarities in the width direction.

[0363] The auxiliary magnet 330 includes a first surface 331 and a second surface 332.

[0364] The first surface 331 is located on one surface of the auxiliary magnet 330 facing the first magnet 321 and the second magnet 322. Also, the second surface 332 is located on the other surface of the auxiliary magnet 330 opposite to the first surface 331. Since the first surface 331 and the second surface 332 are formed on different surfaces of one auxiliary magnet 330, it can be understood that they are magnetized with opposite polarities.

[0365] Referring to FIGS. 27 to 29, 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 to the N pole, and the opposing surfaces 321b, 322b, 323b, 324b are all magnetized to the S pole. Accordingly, 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.

[0366] Also, the first surface 331 of the auxiliary magnet 330 is magnetized to the N pole, and the second surface 332 is magnetized to the S pole. Accordingly, a magnetic field in the direction of pushing each other is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322. Conversely, a magnetic field in the direction from the third opposing surface 323a and the fourth opposing surface 324a toward the second surface 332 is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324.

[0367] Also, the first holder 311 and the second holder 312 and the magnet portion 320 are magnetized together to form an accompanying magnetic field.

[0368] In the embodiment illustrated in FIG. 28, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0369] When applying Fleming's left-hand rule considering 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 downward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0370] Similarly, when applying Fleming's left-hand rule considering 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 upward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0371] In the embodiment illustrated in FIG. 29, the direction of the current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0372] When applying Fleming's left-hand rule considering 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 downward to the left. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the left.

[0373] Similarly, when applying Fleming's left-hand rule considering 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 upward to the left. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the left.

[0374] Referring to FIGS. 30 to 32, all 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 magnetized to the S pole, and all the opposite surfaces 321b, 322b, 323b, 324b are magnetized to the N pole. Accordingly, 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.

[0375] Also, the first surface 331 of the auxiliary magnet 330 is magnetized to the N pole, and the second surface 332 is magnetized to the S pole. Accordingly, a magnetic field in the direction from the first surface 331 toward the first opposing surface 321a and the second opposing surface 322a is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322. Conversely, a magnetic field in the direction of pushing each other is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324.

[0376] Also, the first holder 311 and the second holder 312 and the magnet portion 320 are magnetized together to form an accompanying magnetic field.

[0377] In the embodiment illustrated in FIG. 31, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0378] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0379] 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 right side. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper right side.

[0380] In the embodiment illustrated in FIG. 32, 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.

[0381] 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 downward to the right. Accordingly, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the right.

[0382] 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 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.

[0383] Referring to FIGS. 33 to 35, the opposing surfaces 321a and 322a of the first magnet 321 and the second magnet 322 are all magnetized to the N pole, and the opposing surfaces 323a and 324a of the third magnet 323 and the fourth magnet 324 are all magnetized to the S pole.

[0384] Accordingly, a magnetic field in a direction of pushing each other is formed between the first magnet 321 and the second magnet 322 and between the third magnet 323 and the fourth magnet 324. Conversely, a magnetic field in a direction from the first magnet 321 toward the third magnet 323 and the fourth magnet 324 is formed between the first magnet 321 and the third magnet 323 and the fourth magnet 324. Also, a magnetic field in a direction from the second magnet 322 toward the third magnet 323 and the fourth magnet 324 is formed between the second magnet 322 and the third magnet 323 and the fourth magnet 324.

[0385] Further, the first surface 331 of the auxiliary magnet 330 is magnetized to the N pole, and the second surface 332 is magnetized to the S pole. Accordingly, a magnetic field in the direction of pushing each other is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322. Also, a magnetic field in the direction of pushing each other is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324.

[0386] Also, the first holder 311 and the second holder 312 and the magnet part 320 are magnetized together to form an accompanying magnetic field.

[0387] In the embodiment illustrated in FIG. 34, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0388] 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 downward to the left. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the left.

[0389] 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 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.

[0390] In the embodiment illustrated in FIG. 35, the direction of the current is from the first fixed contact 22a through the movable contact 43 to the second fixed contact 22b.

[0391] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed upward and to the right. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed upward and to the right.

[0392] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed downward and to the left. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed downward and to the left.

[0393] Referring to FIGS. 36 to 38, all of the opposing surfaces 321a and 322a of the first magnet 321 and the second magnet 322 are magnetized to the N pole, and all of the opposing surfaces 323a and 324a of the third magnet 323 and the fourth magnet 324 are magnetized to the S pole.

[0394] Accordingly, a magnetic field in a direction of pushing each other is formed between the first magnet 321 and the second magnet 322 and between the third magnet 323 and the fourth magnet 324. Conversely, a magnetic field in a direction from the first magnet 321 toward the third magnet 323 and the fourth magnet 324 is formed between the first magnet 321 and the third magnet 323 and the fourth magnet 324. Also, a magnetic field in a direction from the second magnet 322 toward the third magnet 323 and the fourth magnet 324 is formed between the second magnet 322 and the third magnet 323 and the fourth magnet 324.

[0395] Also, the first surface 331 of the auxiliary magnet 330 is magnetized to the S pole, and the second surface 332 is magnetized to the N pole. Accordingly, a magnetic field in a direction toward the first surface 331 is formed between the first surface 331 of the auxiliary magnet 330 and the first opposing surface 321a of the first magnet 321 and the second opposing surface 322a of the second magnet 322. Also, a magnetic field in a direction toward the third opposing surface 323a and the fourth opposing surface 324a is formed between the second surface 332 of the auxiliary magnet 330 and the third opposing surface 323a of the third magnet 323 and the fourth opposing surface 324a of the fourth magnet 324.

[0396] Further, the first holder 311, the second holder 312, and the magnet part 320 are magnetized together to form an accompanying magnetic field.

[0397] In the embodiment illustrated in FIG. 37, 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.

[0398] 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 downward and to the left. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed downward and to the left.

[0399] 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 upward and to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward and to the right.

[0400] In the embodiment illustrated 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.

[0401] 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 upward and to the right. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed upward and to the right.

[0402] 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 downward and to the left. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed downward and to the left.

[0403] Therefore, regardless of the polarity of the magnet part 320 or the direction of the current applied to the DC relay, the arc path forming part 300 according to the present embodiment can form the electromagnetic force and the arc path A.P in a direction away from the central part C.

[0404] Accordingly, damage to each component of the DC relay 1 arranged adjacent to the central part 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.

[0405] 5. Description of arc path forming part 400 according to the fourth embodiment of the present invention Hereinafter, the arc path forming part 400 according to the fourth embodiment of the present invention will be described with reference to FIGS. 39 to 50.

[0406] The arc path forming part 400 according to the present embodiment includes a magnet holder part 410, a magnet part 420, and an auxiliary magnet 430.

[0407] The magnet holder part 410 and the magnet part 420 according to the present embodiment have the same structure and function as the magnet holder part 210 and the magnet part 220 according to the second embodiment described above. However, the auxiliary magnet 430 according to the present embodiment is different from the auxiliary magnet 230 according to the second embodiment described above in that the extension direction thereof intersects the arrangement direction of the first holder 411 and the second holder 412.

[0408] Therefore, the description of the magnet holder part 410 and the magnet part 420 will be replaced with the description of the magnet holder part 210 and the magnet part 420 according to the second embodiment described above, and the auxiliary magnet 430 will be described mainly with reference to the differences from the auxiliary magnet 230 according to the second embodiment described above.

[0409] The auxiliary magnet 430 according to the present embodiment is located radially inside the magnet holder part 410. That is, the auxiliary magnet 430 is located between the first holder 411 and the second holder 412. At this time, the auxiliary magnet 430 extends in a direction intersecting the arrangement direction of the first holder 411 and the second holder 412.

[0410] In the illustrated embodiment, the auxiliary magnet 430 is formed to have polarities in the width direction.

[0411] The auxiliary magnet 430 includes a first surface 431 and a second surface 432.

[0412] The first surface 431 is located on one surface of the auxiliary magnet 430 facing the first magnet 421 and the second magnet 422. Also, the second surface 432 is located on the other surface of the auxiliary magnet 430 opposite to the first surface 431. Since the first surface 431 and the second surface 432 are formed on different surfaces of one auxiliary magnet 430, it can be understood that they are magnetized with opposite polarities to each other.

[0413] Referring to FIGS. 39 to 41, 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 to the N pole, and the opposite surfaces 421b, 422b, 423b, 424b are all magnetized to the S pole. Accordingly, a magnetic field in the 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.

[0414] Also, the first surface 431 of the auxiliary magnet 430 is magnetized to the N pole, and the second surface 432 is magnetized to the S pole. Accordingly, a magnetic field in the direction of pushing each other is formed between the first surface 431 of the auxiliary magnet 430 and the first opposing surface 321a of the first magnet 421 and the second opposing surface 422a of the second magnet 422. Conversely, a magnetic field in the direction from the third opposing surface 423a and the fourth opposing surface 424a toward the second surface 432 is formed between the second surface 432 of the auxiliary magnet 430 and the third opposing surface 423a of the third magnet 423 and the fourth opposing surface 424a of the fourth magnet 424.

[0415] Also, the first holder 411 and the second holder 412 and the magnet portion 420 are magnetized together to form an accompanying magnetic field.

[0416] In the embodiment illustrated in FIG. 40, the direction of the current is from the second fixed contact 22b through the movable contact 43 to the first fixed contact 22a.

[0417] When applying Fleming's left - hand rule considering 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 downward to the right. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed downward to the right.

[0418] Similarly, when applying Fleming's left - hand rule considering 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 upward to the right. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the right.

[0419] In the embodiment illustrated in FIG. 41, 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.

[0420] When applying Fleming's left - hand rule considering 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 downward to the left. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the left.

[0421] Similarly, when applying Fleming's left - hand rule considering 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 upward to the left. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed upward to the left.

[0422] Referring to FIGS. 42 to 44, the opposing surfaces 421a, 422a, 423a, and 424a of the first magnet 421, the second magnet 422, the third magnet 423, and the fourth magnet 424 are all magnetized to the S pole, and the opposing surfaces 421b, 422b, 423b, and 424b are all magnetized to the N pole. Accordingly, 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.

[0423] Also, the first surface 431 of the auxiliary magnet 430 is magnetized to the N pole, and the second surface 432 is magnetized to the S pole. Accordingly, a magnetic field in a direction from the first surface 331 toward the first opposing surface 421a and the second opposing surface 422a is formed between the first surface 431 of the auxiliary magnet 430 and the first opposing surface 421a of the first magnet 421 and the second opposing surface 422a of the second magnet 422. Conversely, a magnetic field in a direction of pushing each other is formed between the second surface 432 of the auxiliary magnet 430 and the third opposing surface 423a of the third magnet 423 and the fourth opposing surface 424a of the fourth magnet 424.

[0424] Also, the first holder 411 and the second holder 412 and the magnet portion 420 are magnetized together to form an accompanying magnetic field.

[0425] In the embodiment illustrated in FIG. 43, 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.

[0426] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0427] 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 right side. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper right side.

[0428] In the embodiment illustrated in FIG. 44, 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.

[0429] 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 downward to the right. Accordingly, the arc path A.P near the first fixed contact 22a is formed to be directed downward to the right.

[0430] 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 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.

[0431] 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.

[0432] Accordingly, damage to each component of the DC relay 1 arranged adjacent to the central portion C can be prevented. Further, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0433] Referring to FIGS. 45 to 47, all of the opposing surfaces 421a, 422a of the first magnet 421 and the second magnet 422 are magnetized to the N pole, and all of the opposing surfaces 423a, 424a of the third magnet 423 and the fourth magnet 424 are magnetized to the S pole.

[0434] Accordingly, 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. Conversely, 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.

[0435] Also, the first surface 431 of the auxiliary magnet 330 is magnetized to the N pole, and the second surface 432 is magnetized to the S pole. Accordingly, magnetic fields in the direction of pushing each other are formed between the first surface 431 of the auxiliary magnet 430 and the first opposing surface 421a of the first magnet 421 and the second opposing surface 422a of the second magnet 422. Also, magnetic fields in the direction of pushing each other are formed between the second surface 432 of the auxiliary magnet 430 and the third opposing surface 423a of the third magnet 423 and the fourth opposing surface 424a of the fourth magnet 424.

[0436] Also, the first holder 411 and the second holder 412 and the magnet unit 420 are magnetized together to form an accompanying magnetic field.

[0437] In the embodiment illustrated in FIG. 46, 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.

[0438] 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 downward. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed downward.

[0439] 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 upward. Accordingly, the arc path A.P near the second fixed contact 22b is also formed to be directed upward.

[0440] In the embodiment illustrated in FIG. 47, 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.

[0441] 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 upward. Along with this, the arc path A.P near the first fixed contact 22a is also formed to be directed upward.

[0442] 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 downward. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed downward.

[0443] Therefore, when a current is passed in the direction from the second fixed contact 22b, through the movable contact 43, and out to the first fixed contact 22a in the arc path forming portion 400 according to this embodiment, the electromagnetic force and the arc path A.P can be formed in a direction away from the central portion C.

[0444] Along with this, 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.

[0445] Referring to FIGS. 48 to 50, all of the opposing surfaces 421a, 422a of the first magnet 421 and the second magnet 422 are magnetized to the N pole, and all of the opposing surfaces 423a, 424a of the third magnet 423 and the fourth magnet 424 are magnetized to the S pole.

[0446] Accordingly, 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. Conversely, 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.

[0447] Also, the first surface 431 of the auxiliary magnet 430 is magnetized to the S pole, and the second surface 432 is magnetized to the N pole. Accordingly, a magnetic field in the direction toward the first surface 431 is formed between the first surface 431 of the auxiliary magnet 430 and the first opposing surface 421a of the first magnet 421 and the second opposing surface 422a of the second magnet 422. Also, a magnetic field in the direction toward the third opposing surface 423a and the fourth opposing surface 424a is formed between the second surface 432 of the auxiliary magnet 430 and the third opposing surface 423a of the third magnet 423 and the fourth opposing surface 424a of the fourth magnet 424.

[0448] Also, the first holder 411 and the second holder 412 and the magnet portion 420 are magnetized together to form an accompanying magnetic field.

[0449] In the embodiment illustrated in FIG. 49, 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.

[0450] 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 lower left side. Accordingly, the arc path A.P near the first fixed contact 22a is also formed to be directed to the lower left side.

[0451] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed to the upper left. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed to the upper left.

[0452] In the embodiment illustrated in FIG. 50, 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.

[0453] When applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the first fixed contact 22a, the electromagnetic force generated near the first fixed contact 22a is formed to be directed to the upper left. Along with this, the arc path A.P near the first fixed contact 22a is formed to be directed to the upper left.

[0454] Similarly, when applying Fleming's left-hand rule in consideration of the direction of the current and the direction of the magnetic field with the second fixed contact 22b, the electromagnetic force generated near the second fixed contact 22b is formed to be directed to the lower left. Along with this, the arc path A.P near the second fixed contact 22b is also formed to be directed to the lower left.

[0455] 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.

[0456] Along with this, damage to each component of the DC relay 1 arranged adjacent to the central portion C can be prevented. Further, the generated arc can be quickly discharged to the outside, and the operating reliability of the DC relay 1 can be improved.

[0457] As described above, the preferred embodiments of the present invention have been described with reference to the embodiments, but the present invention is not limited to the configurations of the described embodiments.

[0458] In addition, the present invention can be variously modified and changed within the scope not departing from the spirit and scope of the present invention described in the following claims by those having ordinary knowledge in the technical field to which the present invention pertains.

[0459] Furthermore, all or part of each of the above embodiments can be selectively combined and configured so that various modifications can be made.

Description of Reference Numerals

[0460] 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 130: Auxiliary magnet 131: First surface 132: Second surface 200: Second embodiment of arc path forming section 210: Magnet holder section 211: First holder 211a: First outer surface 211b: First inner surface 212: Second holder 212a: Second outer surface 212b: Second inner surface 220: Magnet section 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 230: Auxiliary magnet 231: First surface 232: Second surface 300: Third embodiment of arc path forming section 310: Magnet holder section 311: First holder 311a: First outer surface 311b: First inner surface 312: Second holder 312a: Second outer surface 312b: Second inner surface 320: Magnet part 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 330: Auxiliary magnet 331: First surface 332: Second surface 400: Fourth embodiment of arc path forming part 410: Magnet holder part 411: First holder 411a: First outer surface 411b: First inner surface 412: Second holder 412a: Second outer surface 412b: Second inner surface 420: Magnet part 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 430: Auxiliary magnet 431: First surface 432: Second surface A.P: Arc path

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, wherein the first holder and the second holder are each bent and extended at a predetermined angle, are spaced apart from each other, but are arranged in a direction intersecting the arrangement direction of the plurality of fixed contacts, and are arranged such that the respective recesses face each other, wherein the magnet portion A first magnet disposed between the recess of the first holder and one end of the first holder; A second magnet disposed between the recess of the first holder and the other end of the first holder; A third magnet disposed between the recess of the second holder and one end of the second holder; A fourth magnet disposed between the recess of the second holder and the other end of the second holder; and An auxiliary magnet that overlaps the center point of the plurality of fixed contacts and the movement direction of the movable contact and forms a magnetic field in the arc chamber, An arc path forming portion in which the extension direction of the auxiliary magnet is parallel to the arrangement direction of the plurality of fixed contacts.

2. The auxiliary magnet is the arc path forming portion according to claim 1, wherein an extension direction thereof intersects a shortest path between the first magnet and the third magnet.

3. The auxiliary magnet is the arc path forming portion according to claim 1, wherein an extension direction thereof intersects a shortest path between the second magnet and the fourth magnet.

4. The first magnet, the second magnet, the third magnet, the fourth magnet, and the auxiliary magnet are all arranged on the same plane, which is the arc path forming portion according to claim 1.

5. The magnet portion is the arc path forming portion according to claim 1, wherein the first magnet and the third magnet are arranged to face each other, and the second magnet and the fourth magnet are arranged to face each other.

6. 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, The third magnet is arranged to face each other across the virtual line with the fourth magnet, which is the arc path forming portion according to claim 5.

7. The first magnet and the second magnet The arc path forming part according to claim 1, wherein the centers of the plurality of fixed contacts are each 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.

8. The first magnet is such that the shortest path to the third magnet overlaps with the center points of the plurality of fixed contacts and the moving direction of the movable contact, The second magnet is the arc path forming part according to claim 7, wherein the shortest path to the fourth magnet overlaps with the center points of the plurality of fixed contacts and the moving direction of the movable contact.

9. The first magnet is arranged so as to be displaced without facing each other with respect to a virtual line connecting the second magnet, the center points 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 virtual line with the fourth magnet, the arc path forming part according to claim 7.

10. The first magnet is arranged so as to face each other with respect to a virtual line connecting the second magnet, the center points 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 face each other with respect to the virtual line with the fourth magnet, the arc path forming part according to claim 7.

11. 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 part 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 part attached to one surface of the magnet holder part facing the arc chamber to form a magnetic field in the arc chamber, The first and second holders are each bent and extended at a predetermined angle, arranged in a direction intersecting the arrangement direction of the plurality of fixed contacts while being spaced apart from each other, and arranged such that the respective recesses face each other, The magnet part is A first magnet disposed between the recess of the first holder and one end of the first holder; A second magnet disposed between the recess of the first holder and the other end of the first holder; A third magnet disposed between the recess of the second holder and one end of the second holder; A fourth magnet disposed between the recess of the second holder and the other end of the second holder; and The center points of the plurality of fixed contacts overlap with the moving direction of the movable contact, and include an auxiliary magnet that forms a magnetic field in the arc chamber, A DC relay in which the extending direction of the auxiliary magnet is parallel to the arrangement direction of the plurality of fixed contacts.

12. The magnet part is The first magnet and the third magnet are arranged to face each other, and the second magnet and the fourth magnet are arranged to face each other. The first magnet is The second magnet and the center points of the plurality of fixed contacts and the virtual line connecting the recesses of the first holder and the second holder are arranged to face each other across the virtual line. The third magnet is The DC relay according to claim 11, wherein the third magnet and the fourth magnet are arranged to face each other across the virtual line.

13. The first magnet and the second magnet are The DC relay according to claim 11, wherein 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 respect to the center points of the plurality of fixed contacts.

14. The magnet part is The DC relay according to claim 11, wherein 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.

Images