Arc path forming part and DC relay including same

Abstract

The invention relates to an arc path forming portion and a DC relay including the same. The arc path forming portion includes a magnet frame including a first surface, a second surface, and a third surface, and a magnet portion including a first magnet portion, a second magnet portion, and a third magnet portion. A first facing surface of the first magnet portion facing the second magnet portion and a second facing surface of the second magnet portion facing the first magnet portion have the same polarity. A third facing surface of the third magnet portion facing the first magnet portion or the second magnet portion has a polarity different from that of the first facing surface and the second facing surface, and a magnetic force of the third magnet portion is greater than a magnetic force of the first magnet portion and that of the second magnet portion.

Description

[0001] This is a divisional application of a patent application for an invention titled "Arc Path Forming Portion and DC Relay Including the Same", with an application date of April 9, 2020, an application number of 202080082489.5. Technical Field

[0002] The present invention relates to an arc path forming portion and a DC relay including the arc path forming portion. More specifically, the present invention relates to an arc path forming portion having a structure that can form a discharge path for an arc using electromagnetic force and can prevent damage to the DC relay, and a DC relay including the arc path forming portion. Background Art

[0003] A direct current relay is a device that uses the principle of an electromagnet to transmit mechanical drive or transmit current signals. A direct current relay is also referred to as a magnetic switch and is generally classified as a circuit opening and closing device.

[0004] A DC relay includes a fixed contact and a movable contact. The fixed contact is connected to an external power source and a load in a manner that allows power to be supplied. The fixed contact and the movable contact can be in contact with each other or separated from each other.

[0005] By the contact and separation between the fixed contact and the movable contact, power supply via the DC relay is allowed or blocked. The movement is achieved by a driving unit that applies a driving force to the movable contact.

[0006] When the fixed contact and the movable contact are separated, an arc is generated between the fixed contact and the movable contact. An arc is a flow of high-voltage and high-temperature current. Therefore, it is necessary to quickly discharge the generated arc from the DC relay via a preset path.

[0007] The discharge path of the arc is formed by a magnet provided in the DC relay. The magnet forms a magnetic field inside the space where the fixed contact and the movable contact are in contact. The electromagnetic force generated by the formed magnetic field and the flow of current can be used to form the discharge path of the arc.

[0008] Refer to Figure 1 , which shows the space where the fixed contact 1100 and the movable contact 1200 of the DC relay 1000 of the prior art are in contact. As described above, a permanent magnet 1300 is provided in the space.

[0009] The permanent magnet 1300 includes a first permanent magnet 1310 located on the upper side and a second magnet 1320 located on the lower side. The lower side of the first permanent magnet 1310 is magnetized to the N pole, while the upper side of the second permanent magnet 1320 is magnetized to the S pole. Thus, a magnetic field is formed in the direction from the upper side to the lower side.

[0010] In Figure 1 (a), a state is shown in which current flows in through the fixed contact 1100 on the left side and flows out through the fixed contact 1100 on the right side. According to Fleming's left-hand rule, as shown by the slant-shaded arrow, the direction of the electromagnetic force is formed outward. Therefore, the generated arc can be discharged to the outside along the direction of the electromagnetic force.

[0011] Conversely, in Figure 1 (b), a state is shown in which current flows in through the fixed contact 1100 on the right side and flows out through the fixed contact 1100 on the left side. According to Fleming's left-hand rule, as shown by the slant-shaded arrow, the direction of the electromagnetic force is formed inward. Therefore, the generated arc moves inward along the direction of the electromagnetic force.

[0012] In the central part of the DC relay 1000, that is, the space between the respective fixed contacts 1100, a plurality of members for driving the movable contact 1200 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.

[0013] Therefore, as shown in Figure 1 (b), when the generated arc moves toward the central part, there is a risk that the plurality of members provided at the said position may be damaged by the energy of the arc.

[0014] And, as shown in Figure 1 , the direction of the electromagnetic force formed inside the DC relay 1000 of the prior art depends on the direction of the current flowing through the fixed contact 1200. Therefore, it is preferable to make the current flow only in a preset direction in the fixed contact 1100, that is, only in the direction shown in Figure 1 (a).

[0015] That is, every time the user uses the DC relay, it is necessary to consider the direction of the current. This may cause inconvenience in using the DC relay. And, regardless of the user's intention, it is also impossible to rule out the situation where the direction of the current applied to the DC relay changes due to unskilled operation, etc.

[0016] In this case, the members provided in the central part of the DC relay may be damaged by the generated arc. Thus, not only the durability of the DC relay is reduced, but there is also a risk of safety accidents.

[0017] Korean Patent Publication No. 10-1696952 discloses a DC relay. Specifically, a DC relay having a structure that can prevent the movement of a movable contact using a plurality of permanent magnets is disclosed.

[0018] However, although the DC relay having the above structure can prevent the movement of the movable contact using a plurality of permanent magnets, there are limitations in the technical solutions that do not consider the direction of the discharge path for controlling the arc.

[0019] Korean Patent Publication No. 10-1216824 discloses a DC relay. Specifically, a DC relay having a structure that can prevent any separation between a movable contact and a fixed contact using a damping magnet is disclosed.

[0020] However, the DC relay having the above structure only discloses a technical solution for maintaining the contact state between the movable contact and the fixed contact. That is, there are limitations in the technical solutions that do not propose a discharge path for the generated arc when the movable contact and the fixed contact are separated.

[0021] Korean Patent Publication No. 10-1696952 (Jan. 16, 2017)

[0022] Korean Patent Publication No. 10-1216824 (Dec. 28, 2012) Summary of the Invention

[0023] Problems to be Solved

[0024] An object of the present invention is to provide an arc path forming unit having a structure capable of solving the above problems and a DC relay including the arc path forming unit.

[0025] First, an object of the present invention is to provide an arc path forming unit having a structure in which the generated arc does not extend toward the central portion and a DC relay including the arc path forming unit.

[0026] In addition, another object of the present invention is to provide an arc path forming unit having a structure capable of minimizing the damage to the components located in the central portion due to the generated arc and a DC relay including the arc path forming unit.

[0027] In addition, another object of the present invention is to provide an arc path forming unit having a structure that moves the generated arc and can be sufficiently extinguished and a DC relay including the arc path forming unit.

[0028] In addition, an object of the present invention is to provide an arc path forming portion having a structure capable of strengthening the intensity of a magnetic field for forming a discharge path of an arc, and a DC relay including the arc path forming portion.

[0029] In addition, an object of the present invention is to provide an arc path forming portion having a structure capable of preventing the formed arc paths from overlapping each other, and a DC relay including the arc path forming portion.

[0030] In addition, an object of the present invention is to provide an arc path forming portion having a structure capable of changing the discharge path of an arc without significantly changing the structure, and a DC relay including the arc path forming portion.

[0031] Technical solution for solving the problem

[0032] To achieve the above object, the present invention provides an arc path forming portion, which includes: a magnet frame, in which a space is formed inside, and which has a plurality of surfaces surrounding the space; and a magnet portion, which is combined with the plurality of surfaces and forms a magnetic field in the space, the magnet frame includes: a first surface, which is formed to extend along one direction; and a second surface, which faces the first surface and is formed to extend along the one direction, the magnet portion includes: a first magnet portion, which is located on the first surface; and a second magnet portion, which is arranged to face the first magnet portion on the second surface, a first facing surface of the first magnet portion facing the second magnet portion and a second facing surface of the second magnet portion facing the first magnet portion have the same polarity.

[0033] Moreover, the magnet frame of the arc path forming portion may include a third surface, which is continuously formed with one end portion of the first surface and one end portion of the second surface, and the magnet portion includes a third magnet portion located on the third surface.

[0034] Moreover, in the arc path forming portion, a third facing surface of the third magnet portion facing the first magnet portion or the second magnet portion may have the same polarity as the first facing surface and the second facing surface.

[0035] Moreover, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated, the fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction, the first magnet portion and the second magnet portion are arranged adjacent to the first fixed contact, and the third magnet portion is arranged adjacent to the second fixed contact.

[0036] Moreover, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated. The fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction. The first magnet portion and the second magnet portion are disposed adjacent to the second fixed contact, and the third magnet portion is disposed adjacent to the first fixed contact.

[0037] Moreover, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated. The fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction. The first magnet portion and the second magnet portion are disposed adjacent to one of the first fixed contact and the second fixed contact, and the third magnet portion is disposed adjacent to the other of the first fixed contact and the second fixed contact. A rib portion is formed on one or more surfaces of the first surface and the second surface. The rib portion is located between the first fixed contact and the second fixed contact and protrudes into the space by a predetermined length.

[0038] Moreover, in the arc path forming portion, the rib portions may be respectively formed on the first surface and the second surface. The rib portions are disposed adjacent to the center in the one direction in which the first surface and the second surface extend.

[0039] Moreover, the present invention provides a DC relay, which includes: a fixed contact formed by extending along a direction; a movable contact that contacts or separates from the fixed contact; and an arc path forming portion. A space for accommodating the fixed contact and the movable contact is formed inside the arc path forming portion, and the arc path forming portion is configured to form a magnetic field in the space to form a discharge path for an arc generated due to separation of the fixed contact and the movable contact. The arc path forming portion includes: a magnet frame having a space portion formed inside thereof and having a plurality of faces surrounding the space portion; and a magnet portion coupled to the plurality of faces and forming a magnetic field in the space portion. The magnet frame includes: a first face formed by extending along a direction; and a second face facing the first face and formed by extending along the direction. The magnet portion includes: a first magnet portion located on the first face; and a second magnet portion disposed on the second face facing the first magnet portion. A first facing face of the first magnet portion facing the second magnet portion and a second facing face of the second magnet portion facing the first magnet portion have the same polarity.

[0040] Moreover, in the DC relay, the magnet frame may include: a third face formed by extending between one end portion of the first face and one end portion of the second face; and a fourth face facing the third face and formed by extending between the other end portion of the first face and the other end portion of the second face.

[0041] Moreover, in the DC relay, the magnet portion may include: a third magnet portion located on one of the third face and the fourth face and formed by extending between the first face and the second face.

[0042] Moreover, in the DC relay, a third facing face of the third magnet portion facing the space portion may have the same polarity as the first facing face and the second facing face.

[0043] Moreover, in the DC relay, the fixed contact may include: a first fixed contact disposed adjacent to one end portion in the direction; and a second fixed contact disposed adjacent to the other end portion in the direction. The magnet portion includes a third magnet portion configured to be away from the first magnet portion and the second magnet portion. The first magnet portion and the second magnet portion are disposed adjacent to one of the first fixed contact and the second fixed contact, and the third magnet portion is disposed adjacent to the other of the first fixed contact and the second fixed contact.

[0044] Also, in the DC relay, a third facing surface of the third magnet portion facing the first magnet portion or the second magnet portion may have the same polarity as the first facing surface and the second facing surface.

[0045] Also, in the DC relay, the magnetic force of the third magnet portion may be greater than the magnetic forces of the first magnet portion and the second magnet portion.

[0046] Also, on one or more of the first surface and the second surface of the magnet frame, rib portions may be formed. The rib portions are located between the first fixed contact and the second fixed contact and protrude a predetermined length into the space.

[0047] Moreover, the present invention provides an arc path forming portion, which includes: a magnet frame having a space formed therein and including a plurality of surfaces surrounding the space; and magnet portions coupled to the plurality of surfaces and forming a magnetic field in the space. The magnet frame includes: a first surface extending along one direction; a second surface facing the first surface and extending along the one direction; and a third surface extending between one end portion of the first surface and one end portion of the second surface. The magnet portions include: a first magnet portion located on the first surface; a second magnet portion disposed on the second surface facing the first magnet portion; and a third magnet portion located on the third surface. A first facing surface of the first magnet portion facing the second magnet portion and a second facing surface of the second magnet portion facing the first magnet portion have the same polarity.

[0048] Also, in the arc path forming portion, a third facing surface of the third magnet portion facing the first magnet portion or the second magnet portion may have a polarity different from that of the first facing surface and the second facing surface.

[0049] Also, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated. The fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction. The first magnet portion and the second magnet portion are disposed adjacent to the first fixed contact, and the third magnet portion is disposed adjacent to the second fixed contact.

[0050] Moreover, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated. The fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction. The first magnet portion and the second magnet portion are disposed adjacent to the second fixed contact, and the third magnet portion is disposed adjacent to the first fixed contact.

[0051] Moreover, in the space of the arc path forming portion, a fixed contact extending along the one direction and a movable contact configured to contact or separate from the fixed contact may be accommodated. The fixed contact includes a first fixed contact located on one side in the one direction and a second fixed contact located on the other side in the one direction. The first magnet portion and the second magnet portion are disposed adjacent to one of the first fixed contact and the second fixed contact, and the third magnet portion is disposed adjacent to the other of the first fixed contact and the second fixed contact. On one or more of the first surface and the second surface, rib portions are formed. The rib portions are located between the first fixed contact and the second fixed contact and protrude into the space by a predetermined length.

[0052] Moreover, in the arc path forming portion, the rib portions may be respectively formed on both the first surface and the second surface, and the rib portions are disposed adjacent to the center in the one direction in which the first surface and the second surface extend.

[0053] Moreover, the magnetic force of the third magnet portion may be greater than the magnetic forces of the first magnet portion and the second magnet portion.

[0054] Moreover, the present invention provides a DC relay, which includes: a fixed contact formed by extending along a direction; a movable contact that contacts or separates from the fixed contact; and an arc path forming portion. A space for accommodating the fixed contact and the movable contact is formed inside the arc path forming portion, and it is configured to form a magnetic field in the space to form a discharge path for an arc generated due to the separation of the fixed contact and the movable contact. The arc path forming portion includes: a magnet frame having a space portion formed inside and having a plurality of surfaces surrounding the space portion; and a magnet portion combined with the plurality of surfaces and forming a magnetic field in the space portion. The magnet frame includes: a first surface formed by extending along a direction; a second surface facing the first surface and formed by extending along the direction; a third surface extending between one end portion of the first surface and one end portion of the second surface; and a fourth surface facing the third surface and extending between the other end portion of the first surface and the other end portion of the second surface. The magnet portion includes: a first magnet portion located on the first surface; a second magnet portion arranged to face the first magnet portion on the second surface; and a third magnet portion located on one of the third surface and the fourth surface and extending between the first surface and the second surface. A first facing surface of the first magnet portion facing the second magnet portion and a second facing surface of the second magnet portion facing the first magnet portion have the same polarity.

[0055] Moreover, in the DC relay, a third facing surface of the third magnet portion facing the space portion may have a polarity different from that of the first facing surface and the second facing surface.

[0056] Moreover, in the DC relay, the fixed contact may include: a first fixed contact arranged adjacent to one end portion in the direction; and a second fixed contact arranged adjacent to the other end portion in the direction. The first magnet portion and the second magnet portion are arranged adjacent to the first fixed contact, and the third magnet portion is arranged adjacent to the second fixed contact.

[0057] Moreover, the fixed contact may include: a first fixed contact arranged adjacent to one end portion in the direction; and a second fixed contact arranged adjacent to the other end portion in the direction. The first magnet portion and the second magnet portion are arranged adjacent to the second fixed contact, and the third magnet portion is arranged adjacent to the first fixed contact.

[0058] Moreover, in the DC relay, the magnetic force of the third magnet portion may be greater than the magnetic forces of the first magnet portion and the second magnet portion.

[0059] Moreover, in the DC relay, ribs may be formed on one or more of the first surface and the second surface. The ribs are located between the first fixed contact and the second fixed contact and protrude a predetermined length into the space.

[0060] Moreover, in the DC relay, the ribs may be respectively formed on both the first surface and the second surface.

[0061] Moreover, in the DC relay, the ribs may be located at the center in the extending direction of the first surface and the second surface.

[0062] Technical effects

[0063] According to embodiments of the present invention, the following effects can be achieved.

[0064] First, the arc path forming portion forms a magnetic field inside the arc chamber. The magnetic field and the current flowing through the fixed contact and the movable contact together form an electromagnetic force. The electromagnetic force is formed along a direction away from the center of the arc chamber.

[0065] Thereby, in the same direction as the electromagnetic force, the generated arc moves in a direction away from the center of the arc chamber. Therefore, the generated arc does not move toward the central portion of the arc chamber.

[0066] In addition, in each of the magnet portions provided on the mutually facing surfaces, the mutually facing sides have the same polarities as each other. Similarly, on the other surface, the side facing each of the magnet portions has the same polarity as the mutually facing sides of each of the magnet portions.

[0067] That is, regardless of the direction of the current, the electromagnetic force formed near each fixed contact is formed along a direction away from the central portion.

[0068] In another embodiment, in each of the magnet portions provided on the mutually facing surfaces, the mutually facing sides have the same polarities as each other. On the other surface, the side facing each of the magnet portions has a polarity different from the mutually facing sides of each of the magnet portions.

[0069] Thereby, regardless of the direction of the current, the electromagnetic force formed near each fixed contact is formed along a direction away from the central portion.

[0070] In addition, as described above, the generated arc moves in a direction away from the central portion of the arc chamber.

[0071] Therefore, a plurality of structural elements located in the central portion are not damaged by the generated arc.

[0072] In addition, the generated arc extends over a relatively wide space, i.e., outside the fixed contact, rather than extending toward the center of the magnet frame, which is a narrow space, i.e., between the fixed contacts.

[0073] Therefore, the arc can be sufficiently extinguished during movement along a longer path.

[0074] In addition, the formed arc paths extend in directions away from each other. That is, the paths of the arcs formed near each fixed contact portion do not extend toward each other.

[0075] Therefore, the arcs flowing along the paths of the arcs formed by the electromagnetic force do not overlap each other. Thus, damage to the DC relay caused by the generated arc can be minimized.

[0076] In addition, the arc path forming portion includes a plurality of magnet portions. Each magnet portion forms a main magnetic field between them. Each magnet portion itself forms a secondary magnetic field. The secondary magnetic field is configured to strengthen the intensity of the main magnetic field.

[0077] Therefore, the intensity of the electromagnetic force formed by the main magnetic field can be strengthened. Thus, a discharge path for the arc can be effectively formed.

[0078] In addition, electromagnetic force can be formed in various directions simply by changing the arrangement and polarity of each magnet portion. At this time, there is no need to change the structure and shape of the magnet frame for arranging each magnet portion.

[0079] Therefore, the discharge direction of the arc can be easily changed without excessively changing the overall structure of the arc path forming portion. Thus, user convenience can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 is a conceptual diagram showing the movement path of the arc formed in the DC relay of the prior art.

[0081] Figure 2 is a perspective view of the DC relay according to an embodiment of the present invention.

[0082] Figure 3 is Figure 2 a cross-sectional view of the DC relay.

[0083] Figure 4 is Figure 2 a partially open perspective view of the DC relay.

[0084] Figure 5 isFigure 2 Partial open perspective view of a DC relay.

[0085] Figure 6 Conceptual diagram of the arc path forming part of an embodiment of the present invention.

[0086] Figure 7 Is Figure 6 Conceptual diagram of the arc path forming part of a modified example of the embodiment of.

[0087] Figure 8 Conceptual diagram of the arc path forming part of another embodiment of the present invention.

[0088] Figure 9 Is Figure 8 Conceptual diagram of the arc path forming part of a modified example of the embodiment of.

[0089] Figure 10 Shows the arc formed by Figure 6 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (a) of.

[0090] Figure 11 Shows the arc formed by Figure 6 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (b) of.

[0091] Figure 12 Shows the arc formed by Figure 7 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (a) of.

[0092] Figure 13 Shows the arc formed by Figure 7 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (b) of.

[0093] Figure 14 Shows the arc formed by Figure 8 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (a) of.

[0094] Figure 15 Shows the arc formed by Figure 8 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (b) of.

[0095] Figure 16 Shows the arc formed by Figure 9 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (a) of.

[0096] Figure 17 Shows the arc formed by Figure 9 Conceptual diagram of the path of the arc formed by the arc path forming part of the embodiment shown in (b) of.

[0097] 10: DC relay

[0098] 100: Frame part

[0099] 110: Upper frame

[0100] 120: Lower frame

[0101] 130: Insulating plate

[0102] 140: Support plate

[0103] 200: Opening and closing part

[0104] 210: Arc chamber

[0105] 220: Fixed contact

[0106] 220a: First fixed contact

[0107] 220b: Second fixed contact

[0108] 230: Sealing member

[0109] 300: Core part

[0110] 310: Fixed core

[0111] 320: Movable core

[0112] 330: Yoke

[0113] 340: Bobbin

[0114] 350: Coil

[0115] 360: Return spring

[0116] 370: Cylinder barrel

[0117] 400: Movable contact part

[0118] 410: Housing

[0119] 420: Cover

[0120] 430: Movable contact

[0121] 440: Shaft

[0122] 450: Elastic part

[0123] 500: Arc path forming part of an embodiment of the present invention

[0124] 510: Magnet frame

[0125] 511: First surface

[0126] 512: Second side

[0127] 513: Third side

[0128] 514: Fourth side

[0129] 515: Arc discharge hole

[0130] 516: Space part

[0131] 517: Rib part

[0132] 520: Magnet part

[0133] 521: First magnet part

[0134] 521a: First facing surface

[0135] 521b: First opposite surface

[0136] 522: Second magnet part

[0137] 522a: Second facing surface

[0138] 522b: Second opposite surface

[0139] 523: Third magnet part

[0140] 523a: Third facing surface

[0141] 523b: Third opposite surface

[0142] 600: Arc path forming part of another embodiment of the present invention

[0143] 610: Magnet frame

[0144] 611: First side

[0145] 612: Second side

[0146] 613: Third side

[0147] 614: Fourth side

[0148] 615: Arc discharge hole

[0149] 616: Space part

[0150] 617: Rib part

[0151] 620: Magnet part

[0152] 621: First magnet part

[0153] 621a: First facing surface

[0154] 621b: First opposite surface

[0155] 622: Second magnet part

[0156] 622a: Second facing surface

[0157] 622b: Second opposite surface

[0158] 623: Third magnet part

[0159] 623a: Third facing surface

[0160] 623b: Third opposite surface

[0161] 1000: DC relay of the prior art

[0162] 1100: Fixed contact of the prior art

[0163] 1200: Movable contact of the prior art

[0164] 1300: Permanent magnet of the prior art

[0165] 1310: First permanent magnet of the prior art

[0166] 1320: Second permanent magnet of the prior art

[0167] C: Central part of the space parts 516, 616, 716, 816

[0168] M.M.F: Main magnetic field

[0169] S.M.F: Sub magnetic field

[0170] A.P: Path of the arc Detailed implementation mode

[0171] Hereinafter, with reference to the drawings, the arc path forming parts 500 and 600 of the embodiments of the present invention and the DC relay 10 including the same will be described in detail.

[0172] In the following description, the description of some structural elements may be omitted to clarify the features of the present invention.

[0173] 1. Definition of terms

[0174] When referring to a certain structural element being "connected" or "coupled" to another structural element, it may be directly connected or coupled to the other structural element, but it should be understood that other structural elements may also exist between them.

[0175] Conversely, when referring to a certain structural element being "directly connected" or "directly coupled" to another structural element, it should be understood that no other structural elements exist between them.

[0176] Unless otherwise clearly indicated by the context, the singular expressions used in this specification include the plural expressions.

[0177] The term "magnetize" used in the following description refers to the phenomenon that an object has magnetism within a magnetic field.

[0178] The term "polarity" used in the following description refers to the different properties of anodes and cathodes of electrodes, etc. In one embodiment, the polarity can be divided into N pole or S pole.

[0179] The term "electric current" used in the following description refers to the state where two or more components are electrically connected. In one embodiment, "electric current" is used to represent the state where current flows between two or more components or the state where an electrical signal is transmitted between two or more components.

[0180] The term "arc path" used in the following description refers to the path for moving the generated arc or the path for extinguishing and moving the arc.

[0181] The terms "left side", "right side", "upper side", "lower side", "front side", and "rear side" used in the following description can be understood with reference to Figure 2 the coordinate system shown in

[0182] 2. Description of the structure of the DC relay 10 according to an embodiment of the present invention

[0183] With reference to Figure 2 and Figure 3 the DC relay 10 according to an embodiment of the present invention includes: a frame portion 100, an opening and closing portion 200, a core portion 300, and a movable contact portion 400.

[0184] And, with reference to Figures 4 to 9 the DC relay 10 according to an embodiment of the present invention includes arc path forming portions 500, 600. The arc path forming portions 500, 600 can generate electromagnetic force, thereby forming a discharge path for the generated arc.

[0185] Next, each structural element of the DC relay 10 according to an embodiment of the present invention will be described with reference to the drawings, and the arc path forming portions 500, 600 will be described separately.

[0186] (1) Description of the frame portion 100

[0187] The frame part 100 forms the outside of the DC relay 10. A prescribed space is formed inside the frame part 100. Various devices for performing the function of turning on or off the current transmitted from the outside to the DC relay 10 can be accommodated in the said space.

[0188] That is, the frame part 100 functions as a kind of housing.

[0189] The frame part 100 can be formed of an insulating material such as synthetic resin. This is to prevent any energization between the inside and the outside of the frame part 100.

[0190] The frame part 100 includes: an upper frame 110, a lower frame 120, an insulating plate 130, and a support plate 140.

[0191] The upper frame 110 forms the upper side of the frame part 100. A prescribed space is formed inside the upper frame 110.

[0192] The opening and closing part 200 and the movable contact part 400 can be accommodated in the inner space of the upper frame 110. In addition, the arc path forming parts 500 and 600 can also be accommodated in the inner space of the upper frame 110.

[0193] The upper frame 110 can be combined with the lower frame 120. The insulating plate 130 and the support plate 140 can be provided in the space between the upper frame 110 and the lower frame 120.

[0194] The fixed contact 220 of the opening and closing part 200 is located on one side of the upper frame 110, that is, the upper side in the illustrated embodiment. A part of the fixed contact 220 is exposed from the upper side of the upper frame 110, whereby it can be electrically connected to an external power source or load.

[0195] For this purpose, a through hole for passing through and combining the fixed contact 220 can be formed on the upper side of the upper frame 110.

[0196] The lower frame 120 forms the lower side of the frame part 100. A prescribed space is formed inside the lower frame 120. The core part 300 can be accommodated in the inner space of the lower frame 120.

[0197] The lower frame 120 can be combined with the upper frame 110. The insulating plate 130 and the support plate 140 can be provided in the space between the lower frame 120 and the upper frame 110.

[0198] The insulating plate 130 and the support plate 140 are configured to electrically isolate and physically isolate the inner space of the upper frame 110 and the inner space of the lower frame 120.

[0199] The insulating plate 130 is located between the upper frame 110 and the lower frame 120. The insulating plate 130 is configured to electrically isolate the upper frame 110 and the lower frame 120. To this end, the insulating plate 130 may be formed of an insulating material such as synthetic resin.

[0200] By using the insulating plate 130, any energization between the opening / closing part 200, the movable contact part 400, and the arc path forming parts 500 and 600 accommodated inside the upper frame 110 and the core part 300 accommodated inside the lower frame 120 can be prevented.

[0201] A through hole (not shown) is formed in the central part of the insulating plate 130. The shaft 440 of the movable contact part 400 can be penetrated and coupled to the through hole (not shown) so as to be movable in the vertical direction.

[0202] The support plate 140 is located on the lower side of the insulating plate 130. The insulating plate 130 can be supported by the support plate 140.

[0203] The support plate 140 is located between the upper frame 110 and the lower frame 120.

[0204] The support plate 140 is configured to physically separate the upper frame 110 and the lower frame 120. Further, the support plate 140 is configured to support the insulating plate 130.

[0205] The support plate 140 may be formed of a magnetic material. Therefore, the support plate 140 and the yoke 330 of the core part 300 can form a magnetic circuit together. By using the magnetic circuit, a driving force for moving the movable core 320 of the core part 300 toward the fixed core 310 can be formed.

[0206] A through hole (not shown) is formed in the central part of the support plate 140. The shaft 440 can be coupled to the through hole (not shown) so as to be movable in the vertical direction.

[0207] Therefore, when the movable core 320 moves in the direction toward the fixed core 310 or separates from the fixed core 310, the shaft 440 and the movable contact 430 connected to the shaft 440 can also move together in the same direction.

[0208] (2) Description of the opening / closing part 200

[0209] The opening / closing part 200 is configured to allow or block the energization of current according to the operation of the core part 300. Specifically, the opening / closing part 200 can allow or block the energization of current by bringing the fixed contact 220 and the movable contact 430 into contact with or separating them from each other.

[0210] The opening / closing unit 200 is accommodated in the internal space of the upper frame 110. The opening / closing unit 200 can be electrically and physically separated from the core unit 300 by using the insulating plate 130 and the support plate 140.

[0211] The opening / closing unit 200 includes: an arc chamber 210, a fixed contact 220, and a sealing member 230.

[0212] Moreover, arc path forming units 500, 600 can be provided outside the arc chamber 210. The arc path forming units 500, 600 can form a magnetic field for forming the path A.P of the arc generated inside the arc chamber 210. This will be described in detail below.

[0213] The arc chamber 210 is configured to extinguish the arc generated due to the separation of the fixed contact 220 and the movable contact 430 in the internal space. Thus, the arc chamber 210 can also be referred to as the "arc extinguishing unit".

[0214] The arc chamber 210 is configured to accommodate the fixed contact 220 and the movable contact 430 in a sealed manner. That is, the fixed contact 220 and the movable contact 430 are accommodated inside the arc chamber 210. Therefore, the arc generated due to the separation of the fixed contact 220 and the movable contact 430 will not flow out to the outside arbitrarily.

[0215] An arc extinguishing gas can be filled inside the arc chamber 210. The arc extinguishing gas can extinguish the generated arc and discharge it to the outside of the DC relay 10 via a preset path. For this purpose, communication holes (not shown) can be formed through the wall body surrounding the internal space of the arc chamber 210.

[0216] The arc chamber 210 can be formed of an insulating material. And the arc chamber 210 can be formed of a material having high withstand voltage and high heat resistance. This is because the generated arc is a flow of high-temperature and high-pressure electrons. In one embodiment, the arc chamber 210 can be formed of a ceramic material.

[0217] A plurality of through holes can be formed on the upper side of the arc chamber 210. The fixed contacts 220 are respectively penetrated and coupled to each of the through holes.

[0218] In the illustrated embodiment, two fixed contacts 220 are provided, that is, including a first fixed contact 220a and a second fixed contact 220b. Thus, two through holes can also be formed on the upper side of the arc chamber 210.

[0219] If the fixed contact 220 penetrates and is combined with the through hole, the through hole will be sealed. That is, the fixed contact 220 is hermetically combined with the through hole. Thus, the generated arc will not be discharged to the outside through the through hole.

[0220] The lower side of the arc chamber 210 can be open. The insulating plate 130 and the sealing member 230 are in contact with the lower side of the arc chamber 210. That is, the lower side of the arc chamber 210 is sealed by the insulating plate 130 and the sealing member 230.

[0221] Thus, the arc chamber 210 can be electrically and physically separated from the outer space of the upper frame 110.

[0222] The arc extinguished in the arc chamber 210 is discharged to the outside of the DC relay 10 through a preset path. In one embodiment, the arc extinguished can be discharged to the outside of the arc chamber 210 through the communication hole (not shown).

[0223] The fixed contact 220 is configured to contact or separate from the movable contact 430, thereby turning on or off the power supply between the inside and the outside of the DC relay 10.

[0224] Specifically, when the fixed contact 220 and the movable contact 430 are in contact, power can be supplied between the inside and the outside of the DC relay 10. Conversely, when the fixed contact 220 and the movable contact 430 are separated, the power supply between the inside and the outside of the DC relay 10 is blocked.

[0225] As can be determined from the name, the fixed contact 220 does not move. That is, the fixed contact 220 is fixedly combined with the upper frame 110 and the arc chamber 210. Therefore, the contact and separation between the fixed contact 220 and the movable contact 430 are realized by the movement of the movable contact 430.

[0226] One end of the fixed contact 220, i.e., the upper end in the illustrated embodiment, is exposed to the outside of the upper frame 110. The power supply or the load is respectively connected to the one end in a power - on - capable manner.

[0227] A plurality of fixed contacts 220 can be provided. In the illustrated embodiment, two fixed contacts 220 are provided in total, that is, including the first fixed contact 220a on the left side and the second fixed contact 220b on the right side.

[0228] The first fixed contact 220a is located at a position deviated from the center in the extending direction of the movable contact 430, i.e., deviated to the left side in the illustrated embodiment. And the second fixed contact 220b is located at a position deviated from the center in the extending direction of the movable contact 430 to the other side, i.e., deviated to the right side in the illustrated embodiment.

[0229] One of the first fixed contact 220a and the second fixed contact 220b can be connected to a power source in an energizable manner. And, the other fixed contact of the first fixed contact 220a and the second fixed contact 220b can be connected to a load in an energizable manner.

[0230] The DC relay 10 according to an embodiment of the present invention can form an arc path A.P regardless of the direction of the power source or load connected to the fixed contact 220. It is realized by the arc path forming portions 500 and 600, and a detailed description thereof will be given later.

[0231] The other end portion of the fixed contact 220, that is, the lower end portion in the illustrated embodiment, extends toward the movable contact 430.

[0232] When the movable contact 430 moves in the direction toward the fixed contact 220, that is, upward in the illustrated embodiment, the lower end portion comes into contact with the movable contact 430. Thereby, the exterior and interior of the DC relay 10 can be energized.

[0233] The lower end portion of the fixed contact 220 is located inside the arc chamber 210.

[0234] When the control power is turned off, the movable contact 430 separates from the fixed contact 220 under the elastic force of the return spring 360.

[0235] At this time, as the fixed contact 220 and the movable contact 430 separate, an arc is generated between the fixed contact 220 and the movable contact 430. The generated arc is extinguished by the arc extinguishing gas inside the arc chamber 210 and is discharged to the outside along the path formed by the arc path forming portions 500 and 600.

[0236] The sealing member 230 is configured to block any communication between the arc chamber 210 and the space inside the upper frame 110. The sealing member 230, together with the insulating plate 130 and the support plate 140, seals the lower side of the arc chamber 210.

[0237] Specifically, the upper side of the sealing member 230 is combined with the lower side of the arc chamber 210. In addition, the radially inner side of the sealing member 230 is combined with the outer periphery of the insulating plate 130, and the lower side of the sealing member 230 is combined with the support plate 140.

[0238] Thereby, the arc generated in the arc chamber 210 and the arc extinguished by the arc extinguishing gas do not flow out arbitrarily into the inner space of the upper frame 110.

[0239] And, the sealing member 230 can be configured to block any communication between the inner space of the cylinder 370 and the inner space of the frame portion 100.

[0240] (3) Description of the core portion 300

[0241] The core part 300 is configured to move the movable contact part 400 upward as the control power supply is applied. Further, the core part 300 is configured to move the movable contact part 400 downward again when the application of the control power supply is released.

[0242] The core part 300 is connected to an external control power supply (not shown) in a manner that allows electricity to pass through, so that the control power supply can be received.

[0243] The core part 300 is located below the opening / closing part 200. Further, the core part 300 is accommodated inside the lower frame 120. The core part 300 and the opening / closing part 200 can be electrically and physically separated by the insulating plate 130 and the support plate 140.

[0244] The movable contact part 400 is located between the core part 300 and the opening / closing part 200. The movable contact part 400 can be moved by the driving force applied by the core part 300. Thereby, the movable contact 430 comes into contact with the fixed contact 220, so that the DC relay 10 can be energized.

[0245] The core part 300 includes: a fixed core 310, a movable core 320, a yoke 330, a bobbin 340, a coil 350, a return spring 360, and a cylinder 370.

[0246] The fixed core 310 is magnetized by the magnetic field generated by the coil 350 to generate an electromagnetic attraction force. Under the action of the electromagnetic attraction force, the movable core 320 moves toward the fixed core 310 ( Figure 3 in the upward direction in).

[0247] The fixed core 310 does not move. That is, the fixed core 310 is fixedly coupled to the support plate 140 and the cylinder 370.

[0248] The fixed core 310 can be configured in any form capable of being magnetized by a magnetic field to generate an electromagnetic force. In one embodiment, the fixed core 310 can be composed of a permanent magnet, an electromagnet, or the like.

[0249] The fixed core 310 is partially accommodated in the upper space inside the cylinder 370. Further, the outer periphery of the fixed core 310 is configured to contact the inner periphery of the cylinder 370.

[0250] The fixed core 310 is located between the support plate 140 and the movable core 320.

[0251] A through hole (not shown) is formed in the central portion of the fixed core 310. The shaft 440 is movably inserted through the through hole (not shown).

[0252] The fixed core 310 is provided at a predetermined distance from the movable core 320. Accordingly, the distance by which the movable core 320 can move toward the fixed core 310 can be defined as the predetermined distance. Thus, the predetermined distance can be defined as "the moving distance of the movable core 320".

[0253] One end portion of the return spring 360, i.e., the upper end portion in the illustrated embodiment, contacts the lower side of the fixed core 310. If the fixed core 310 is magnetized such that the movable core 320 moves upward, the return spring 360 is compressed and stores a restoring force.

[0254] Thus, when the application of the control power supply is released to end the magnetization of the fixed core 310, the movable core 320 can be reset to the lower side again under the action of the restoring force.

[0255] The movable core 320 is configured to move toward the fixed core 310 under the action of the electromagnetic attraction force generated by the fixed core 310 when the control power supply is applied.

[0256] As the movable core 320 moves, the shaft 440 coupled to the movable core 320 moves in the direction toward the fixed core 310, i.e., upward in the illustrated embodiment. And, as the shaft 440 moves, the movable contact portion 400 coupled to the shaft 440 moves upward.

[0257] Thus, the fixed contact 220 and the movable contact 430 come into contact with each other, so that the DC relay 10 can be energized with an external power supply or load.

[0258] The movable core 320 can be configured in any form capable of receiving the attraction force generated by the electromagnetic force. In one embodiment, the movable core 320 can be formed of a magnetic material, or can be constituted by a permanent magnet or an electromagnet, etc.

[0259] The movable core 320 is accommodated inside the cylinder 370. And, the movable core 320 can move inside the cylinder 370 along the extending direction of the cylinder 370, i.e., along the up and down direction in the illustrated embodiment.

[0260] Specifically, the movable core 320 can move along the direction toward the fixed core 310 and the direction away from the fixed core 310.

[0261] The movable core 320 is coupled to the shaft 440. The movable core 320 can move integrally with the shaft 440. When the movable core 320 moves upward or downward, the shaft 440 also moves upward or downward. Thus, the movable contact 430 also moves upward or downward.

[0262] The movable core 320 is located below the fixed core 310. The movable core 320 is separated from the fixed core 310 by a predetermined distance. As described above, the predetermined distance is the distance by which the movable core 320 can move in the vertical direction.

[0263] The movable core 320 is formed to extend in one direction. A hollow portion extending in the one direction is formed inside the movable core 320, and the hollow portion is formed by being recessed by a predetermined distance. The return spring 360 and the lower side portion of the shaft 440 penetrating and coupled to the return spring 360 are partially accommodated in the hollow portion.

[0264] A through hole penetrating in the one direction is formed below the hollow portion. The hollow portion communicates with the through hole. The lower end portion of the shaft 440 inserted into the hollow portion can travel toward the through hole.

[0265] A space portion recessed by a predetermined distance is formed at the lower end portion of the movable core 320. The space portion communicates with the through hole. The lower head portion of the shaft 440 is located in the space portion.

[0266] When a control power supply is applied, the yoke 330 forms a magnetic circuit. The magnetic circuit formed by the yoke 330 can be configured to adjust the direction of the magnetic field formed by the coil 350.

[0267] Accordingly, when a control power supply is applied, the coil 350 can generate a magnetic field in a direction that moves the movable core 320 toward the fixed core 310. The yoke 330 can be formed of an electrically conductive material that can be energized.

[0268] The yoke 330 is accommodated inside the lower frame 120. The yoke 330 is configured to surround the coil 350. The coil 350 can be accommodated inside the yoke 330 and is separated from the inner peripheral surface of the yoke 330 by a predetermined distance.

[0269] The bobbin 340 is accommodated inside the yoke 330. That is, the yoke 330, the coil 350, and the bobbin 340 for winding the coil 350 are sequentially arranged in a direction from the outer periphery of the lower frame 120 toward the radial inner side.

[0270] The upper side of the yoke 330 is in contact with the support plate 140. Also, the outer periphery of the yoke 330 can be in contact with the inner periphery of the lower frame 120 or can be provided at a predetermined distance from the inner periphery of the lower frame 120.

[0271] The coil 350 is wound around the bobbin 340. The bobbin 340 is accommodated inside the yoke 330.

[0272] The bobbin 340 may include: a flat upper portion and a lower portion; and a cylindrical column portion formed and connected to the upper and lower portions along one direction. That is, the bobbin 340 has the shape of a bobbin.

[0273] The upper portion of the bobbin 340 is in contact with the lower side of the support plate 140. The coil 350 is wound around the column portion of the bobbin 340. The thickness of the wound coil 350 may be configured to be the same as or smaller than the diameters of the upper and lower portions of the bobbin 340.

[0274] A hollow portion extending along one direction is formed through the column portion of the bobbin 340. The cylinder 370 may be accommodated in the hollow portion. The column portion of the bobbin 340 may be configured to have the same central axis as the fixed core 310, the movable core 320, and the shaft 440.

[0275] The coil 350 generates a magnetic field using the applied control power supply. The fixed core 310 is magnetized by the magnetic field generated by the coil 350, and thus an electromagnetic attraction force can be applied to the movable core 320.

[0276] The coil 350 is wound around the bobbin 340. Specifically, the coil 350 is wound around the column portion of the bobbin 340 and stacked along the radial outer side of the column portion. The coil 350 is accommodated inside the yoke 330.

[0277] When the control power supply is applied, the coil 350 generates a magnetic field. At this time, the intensity or direction of the magnetic field generated by the coil 350 can be controlled using the yoke 330. Under the action of the magnetic field generated by the coil 350, the fixed core 310 is magnetized.

[0278] If the fixed core 310 is magnetized, the movable core 320 is subjected to an electromagnetic force, i.e., an attraction force, in the direction toward the fixed core 310. Thus, the movable core 320 moves in the direction toward the fixed core 310, i.e., moves upward in the illustrated embodiment.

[0279] The return spring 360 provides a restoring force for returning the movable core 320 to its original position when the application of the control power supply is released after the movable core 320 moves toward the fixed core 310.

[0280] As the movable core 320 moves toward the fixed core 310, the return spring 360 is compressed and stores the restoring force. At this time, preferably, the stored restoring force is less than the electromagnetic attraction force acting on the movable core 320 due to the magnetization of the fixed core 310. This is to prevent the movable core 320 from being arbitrarily returned to its original position by the return spring 360 during the application of the control power supply.

[0281] When the application of the control power is released, the movable core 320 is subjected to the restoring force generated by the return spring 360. Of course, the gravity generated by the empty weight of the movable core 320 may also act on the movable core 320. Thus, the movable core 320 can move in a direction away from the fixed core 310 and return to its original position.

[0282] The return spring 360 may be configured in any form that can store the restoring force through its shape deformation and can transmit the restoring force to the outside by returning to its original shape. In one embodiment, the return spring 360 may be composed of a coil spring.

[0283] The shaft 440 is penetrated and coupled to the return spring 360. The shaft 440 can move in the vertical direction regardless of the shape change of the return spring 360 in a state of being coupled to the return spring 360.

[0284] The return spring 360 is accommodated in a hollow portion formed by being recessed on the upper side of the movable core 320. In addition, one end portion of the return spring 360 facing the fixed core 310, that is, the upper end portion in the illustrated embodiment, is accommodated in a hollow portion formed by being recessed on the lower side of the fixed core 310.

[0285] The cylinder 370 is for accommodating the fixed core 310, the movable core 320, the return spring 360, and the shaft 440. The movable core 320 and the shaft 440 can move in the upper and lower directions inside the cylinder 370.

[0286] The cylinder 370 is located in a hollow portion formed on the column portion of the winding shaft 340. The upper end portion of the cylinder 370 is in contact with the lower side surface of the support plate 140.

[0287] The side surface of the cylinder 370 is in contact with the inner circumferential surface of the column portion of the winding shaft 340. The upper opening portion of the cylinder 370 may be sealed by the fixed core 310. The lower side surface of the cylinder 370 may be in contact with the inner surface of the lower frame 120.

[0288] (4) Description of the movable contact portion 400

[0289] The movable contact portion 400 includes a movable contact 430 and a structural element for moving the movable contact 430. The DC relay 10 can be energized with an external power source or load by using the movable contact portion 400.

[0290] The movable contact portion 400 is accommodated in the internal space of the upper frame 110. And, the movable contact portion 400 can be accommodated in the arc chamber 210 in a manner that can move up and down.

[0291] The fixed contact 220 is located on the upper side of the movable contact head 400. The movable contact head 400 is accommodated inside the arc chamber 210 in such a way that it can move in the direction towards the fixed contact 220 and in the direction away from the fixed contact 220.

[0292] The core part 300 is located on the lower side of the movable contact head 400. The movement of the movable contact head 400 can be achieved by the movement of the movable core 320.

[0293] The movable contact head 400 includes: a housing 410, a cover 420, a movable contact 430, a shaft 440, and an elastic part 450.

[0294] The housing 410 accommodates the movable contact 430 and elastically supports the elastic part 450 that supports the movable contact 430.

[0295] In the illustrated embodiment, one side of the housing 410 and the other side facing it are open (refer to Figure 5 ). The movable contact 430 can be inserted through the open part.

[0296] The non-open side surfaces of the housing 410 can be configured to cover the accommodated movable contact 430.

[0297] A cover 420 is provided on the upper side of the housing 410. The cover 420 is configured to surround the upper side surface of the movable contact 430 accommodated in the housing 410.

[0298] The housing 410 and the cover 420 are preferably formed of an insulating material to prevent unintended energization. In one embodiment, the housing 410 and the cover 420 can be formed of synthetic resin or the like.

[0299] The lower side of the housing 410 is connected to the shaft 440. When the movable core 320 connected to the shaft 440 moves upward or downward, the housing 410 and the movable contact 430 accommodated in the housing 410 can also move upward or downward.

[0300] The housing 410 and the cover 420 can be combined using any member. In one embodiment, the housing 410 and the cover 420 can be combined using fastening members such as bolts and nuts (not shown).

[0301] When a control power supply is applied, the movable contact 430 comes into contact with the fixed contact 220, thereby energizing the DC relay 10 with an external power supply and a load. Additionally, when the application of the control power supply is removed, the movable contact 430 separates from the fixed contact 220, thereby de-energizing the DC relay 10 from the external power supply and the load.

[0302] The movable contact 430 is disposed adjacent to the fixed contact 220.

[0303] The upper side of the movable contact 430 is partially covered by the cover 420. In one embodiment, a part of the upper side surface of the movable contact 430 may be in contact with the lower side surface of the cover 420.

[0304] The lower side of the movable contact 430 is elastically supported by the elastic part 450. The elastic part 450 may elastically support the movable contact 430 in a state where it is compressed by a predetermined distance to prevent the movable contact 430 from moving downward arbitrarily.

[0305] The movable contact 430 is formed to extend in one direction, and in the illustrated embodiment, it is formed to extend in the left - right direction. That is, the length of the movable contact 430 is formed to be longer than the width. Therefore, both ends of the movable contact 430 in the one - direction are exposed to the outside of the housing 410.

[0306] Contact protrusions protruding upward by a predetermined distance may be formed at both ends. The fixed contact 220 is in contact with the contact protrusions.

[0307] The contact protrusions may be formed at positions corresponding to the respective fixed contacts 220a, 220b. Thereby, the moving distance of the movable contact 430 can be reduced, and the contact reliability between the fixed contact 220 and the movable contact 430 can be improved.

[0308] The width of the movable contact 430 may be the same as the distance between the respective side surfaces of the housing 410. That is, when the movable contact 430 is accommodated in the housing 410, both side surfaces in the width direction of the movable contact 430 may be in contact with the inner surfaces of the respective side surfaces of the housing 410.

[0309] Thereby, the state where the movable contact 430 is accommodated in the housing 410 can be stably maintained.

[0310] The shaft 440 transmits the driving force generated by the operation of the core part 300 to the movable contact part 400. Specifically, the shaft 440 is connected to the movable core 320 and the movable contact 430. When the movable core 320 moves upward or downward, the movable contact 430 can also move upward or downward under the action of the shaft 440.

[0311] The shaft 440 is formed to extend in one direction, and in the illustrated embodiment, it is formed to extend in the up - down direction.

[0312] The lower end of the shaft 440 is inserted and coupled to the movable core 320. When the movable core 320 moves in the up - down direction, the shaft 440 can move in the up - down direction together with the movable core 320.

[0313] The main body of the shaft 440 is penetrated and coupled to the fixed core 310 in a vertically movable manner. The return spring 360 is penetrated and coupled to the main body of the shaft 440.

[0314] The upper end portion of the shaft 440 is coupled to the housing 410. When the movable core 320 moves, the shaft 440 and the housing 410 can move together.

[0315] The diameters of the upper and lower end portions of the shaft 440 can be formed to be larger than the diameter of the main body of the shaft 440. Accordingly, the shaft 440 can stably maintain the coupled state with the housing 410 and the movable core 320.

[0316] The elastic portion 450 elastically supports the movable contact 430. When the movable contact 430 contacts the fixed contact 220, the movable contact 430 tends to separate from the fixed contact 220 under the action of the electromagnetic repulsive force.

[0317] At this time, the elastic portion 450 is configured to elastically support the movable contact 430, thereby preventing the movable contact 430 from arbitrarily separating from the fixed contact 220.

[0318] The elastic portion 450 can be configured in any form that can store the restoring force through the deformation of the shape and provide the stored restoring force to other components. In one embodiment, the elastic portion 450 can be formed of a helical spring.

[0319] One end portion of the elastic portion 450 facing the movable contact 430 contacts the lower side of the movable contact 430. And, the other end portion of the elastic portion 450 facing the one end portion contacts the upper side of the housing 410.

[0320] The elastic portion 450 can elastically support the movable contact 430 in a state where the restoring force is stored by being compressed by a predetermined distance. Accordingly, even if the electromagnetic repulsive force is generated between the movable contact 430 and the fixed contact 220, the movable contact 430 does not move arbitrarily.

[0321] In order to achieve the stable coupling of the elastic portion 450, a protruding portion (not shown) inserted into the elastic portion 450 can be formed to protrude on the lower side of the movable contact 430. Similarly, a protruding portion (not shown) inserted into the elastic portion 450 can also be formed to protrude on the upper side of the housing 410.

[0322] 3. Description of the arc path forming portions 500 and 600 of the embodiment of the present invention

[0323] The DC relay 10 of the embodiments of the present invention includes arc path forming portions 500 and 600. The arc path forming portions 500 and 600 form an electromagnetic field inside the arc chamber 210. The electromagnetic field and the current energized in the DC relay 10 together form an electromagnetic force. Thus, a path along which the arc flows in the direction of the electromagnetic force, that is, the path of the arc, can be formed.

[0324] Next, with reference to Figures 4 to 9 The arc path forming portions 500 and 600 of the respective embodiments of the present invention will be described in detail.

[0325] In Figure 4 and Figure 5 In the illustrated embodiment, the arc path forming portions 500 and 600 are located outside the arc chamber 210. The arc path forming portions 500 and 600 are configured to at least partially surround the arc chamber 210.

[0326] In Figures 6 to 9 In the illustrated embodiment, it should be understood that the illustration of the arc chamber 210 is omitted.

[0327] The arc path forming portions 500 and 600 can form a magnetic field inside the arc chamber 210. Under the action of the magnetic field, a path for discharging the arc, that is, the arc path A.P, is formed.

[0328] (1) Description of the arc path forming portion 500 of an embodiment of the present invention

[0329] Hereinafter, with reference to Figure 6 and Figure 7 The arc path forming portion 500 of an embodiment of the present invention will be described in detail.

[0330] In the illustrated embodiment, the arc path forming portion 500 includes a magnet frame 510 and a magnet portion 520.

[0331] The magnet frame 510 forms the frame of the arc path forming portion 500. The magnet portion 520 is arranged in the magnet frame 510. In one embodiment, the magnet portion 520 can be coupled to the magnet frame 510.

[0332] The magnet frame 510 has a rectangular cross-section extending along one direction, that is, the left-right direction in the illustrated embodiment. The shape of the magnet frame 510 can be changed according to the shapes of the upper frame 110 and the arc chamber 210.

[0333] The magnet frame 510 includes: a first surface 511, a second surface 512, a third surface 513, a fourth surface 514, an arc discharge hole 515, a space portion 516, and a rib portion 517.

[0334] The first surface 511, the second surface 512, the third surface 513, and the fourth surface 514 form the outer peripheral surface of the magnet frame 510. That is, the first surface 511, the second surface 512, the third surface 513, and the fourth surface 514 function as the walls of the magnet frame 510.

[0335] The outer sides of the first surface 511, the second surface 512, the third surface 513, and the fourth surface 514 may be in contact with or fixedly coupled to the inner surface of the upper frame 110. And, the magnet portion 520 may be located inside the first surface 511, the second surface 512, the third surface 513, and the fourth surface 514.

[0336] In the illustrated embodiment, the first surface 511 forms the rear side surface. The second surface 512 forms the front side surface and faces the first surface 511.

[0337] And, the third surface 513 forms the left side surface. The fourth surface 514 forms the right side surface and faces the third surface 513.

[0338] The first surface 511 is continuously formed with the third surface 513 and the fourth surface 514. The first surface 511 may form a predetermined angle with the third surface 513 and the fourth surface 514 and be combined therewith. In one embodiment, the predetermined angle may be a right angle.

[0339] The second surface 512 is continuously formed with the third surface 513 and the fourth surface 514. The second surface 512 may form a predetermined angle with the third surface 513 and the fourth surface 514 and be combined therewith. In one embodiment, the predetermined angle may be a right angle.

[0340] Chamfering (taper) processing may be performed on each corner connecting the first surface 511 to the fourth surface 514.

[0341] Inside the first surface 511, that is, on the side of the first surface 511 facing the second surface 512, the first magnet portion 521 may be coupled. And, inside the second surface 512, that is, on the side of the second surface 512 facing the first surface 511, the second magnet portion 522 may be coupled.

[0342] In Figure 6 In the illustrated embodiment, inside the third surface 513, that is, on the side of the third surface 513 facing the fourth surface 514, the third magnet portion 523 may be coupled. In Figure 7 In the illustrated embodiment, inside the fourth surface 514, that is, on the side of the fourth surface 514 facing the third surface 513, the third magnet portion 523 may be coupled.

[0343] That is, as described later, the third magnet portion 523 may be coupled to one of the third surface 513 and the fourth surface 514.

[0344] In order to combine each of the surfaces 511, 512, 513, 514 with the magnet portion 520, fastening members (not shown) may be provided.

[0345] In one or more of the first surface 511 and the second surface 512, arc discharge holes 515 are formed therethrough.

[0346] The arc discharge holes 515 are passages through which the arcs extinguished in the arc chamber 210 are discharged into the internal space of the upper frame 110. The arc discharge holes 515 communicate the space portion 516 of the magnet frame 510 with the space of the upper frame 110.

[0347] In the illustrated embodiment, the arc discharge holes 515 are respectively formed in the first surface 511 and the second surface 512. Moreover, the arc discharge holes 515 may be formed in the middle portion in the left - right direction, which is the extending direction of the first surface 511 and the second surface 512.

[0348] The space surrounded by the first surface 511 to the fourth surface 514 may be defined as the space portion 516.

[0349] The fixed contact 220 and the movable contact 430 are accommodated in the space portion 516. And, as Figure 4 shown, the arc chamber 210 is accommodated in the space portion 516.

[0350] The movable contact 430 can move in the direction toward the fixed contact 220 or away from the fixed contact 220 in a state of being accommodated in the space portion 516.

[0351] Moreover, a path A.P of the arc generated in the arc chamber 210 is formed in the space portion 516. This is achieved by the magnetic field formed by the magnet portion 520.

[0352] The central portion of the space portion 516 may be defined as the central portion C. The linear distances from each corner where the first surface 511 to the fourth surface 514 are connected to the central portion C may be formed to be the same.

[0353] The central portion C is located between the first fixed contact 220a and the second fixed contact 220b. And, the central portion of the movable contact portion 400 is located vertically below the central portion C. That is, the central portions of the housing 410, the cover 420, the movable contact 430, the shaft 440, and the elastic portion 450, etc. are located vertically below the central portion C.

[0354] Therefore, when the generated arc moves toward the central portion C, there may be a case where a plurality of the said structural elements are damaged. In order to prevent such a case from occurring, the arc path forming portion 500 of the present embodiment includes the magnet portion 520.

[0355] On the other hand, the paths A.P of the arcs formed by the arc path forming portion 500 of the embodiments of the present invention do not overlap with each other. However, in order to prevent distortion of the paths A.P of the arcs caused by unpredictable factors, the arc path forming portion 500 of the embodiments of the present invention includes rib portions 517.

[0356] The rib portions 517 are used to separate the paths A.P of the respective arcs, so that the paths A.P of the arcs formed near the first fixed contact 220a and the second fixed contact 220b do not overlap with each other.

[0357] A plurality of rib portions 517 may be provided. In the illustrated embodiment, the rib portions 517 are formed to protrude a predetermined length from the first surface 511 and the second surface 512 toward the space portion 516.

[0358] The rib portions 517 are located between the first fixed contact 220a and the second fixed contact 220b. In one embodiment, the rib portions 517 may be located at the central portions of the first surface 511 and the second surface 512.

[0359] When the paths A.P of the arcs travel toward each other, their extension lengths may be blocked by the rib portions 517. Therefore, the paths A.P of the arcs formed inside the arc path forming portion 500 do not overlap with each other.

[0360] The magnet portion 520 forms a magnetic field inside the space portion 516. The magnetic field formed by the magnet portion 520 and the current flowing along the fixed contact 220 and the movable contact 430 generate an electromagnetic force. Thus, the path A.P of the arc can be formed along the direction of the electromagnetic force. It can be understood that the electromagnetic force is the Lorentz force.

[0361] The magnet portion 520 may form a magnetic field between adjacent magnet portions 520, or each magnet portion 520 itself forms a magnetic field.

[0362] The magnet portion 520 may be constituted by any form that has magnetism by itself or can be magnetized by applying a current or the like. In one embodiment, the magnet portion 520 may be constituted by a permanent magnet, an electromagnet, or the like.

[0363] The magnet portion 520 is combined with the magnet frame 510. In order to realize the combination of the magnet portion 520 and the magnet frame 510, a fastening member (not shown) may be provided.

[0364] In the illustrated embodiment, the magnet portion 520 extends along one direction and has a rectangular parallelepiped shape with a rectangular cross section. The magnet portion 520 may be constituted by any shape that can form a magnetic field.

[0365] A plurality of magnet portions 520 may be provided. In the illustrated embodiment, three magnet portions 520 are provided, but the number thereof may be changed.

[0366] The magnet portion 520 includes a first magnet portion 521, a second magnet portion 522, and a third magnet portion 523.

[0367] The first magnet portion 521 forms a magnetic field together with the second magnet portion 522 or the third magnet portion 523. In addition, the first magnet portion 521 itself may also form a magnetic field.

[0368] The first magnet portion 521 is disposed inside the first surface 511 and biased toward one side in the direction in which the first surface 511 extends. At this time, the first magnet portion 521 is disposed biased toward the same side as the second magnet portion 522 and is disposed facing each other.

[0369] In Figure 6 the illustrated embodiment, the first magnet portion 521 is disposed inside the first surface 511 and biased toward the right. That is, the first magnet portion 521 is located at a position more to the right than the arc discharge hole 515.

[0370] In Figure 7 the embodiment, the first magnet portion 521 is disposed inside the first surface 511 and biased toward the left. That is, the first magnet portion 521 is located at a position more to the left than the arc discharge hole 515.

[0371] In each embodiment, the first magnet portion 521 may form a magnetic field together with the second magnet portion 522 or the third magnet portion 523.

[0372] The first magnet portion 521 and the second magnet portion 522 are disposed facing each other. Specifically, the first magnet portion 521 faces the second magnet portion 522 across the space portion 516.

[0373] In one embodiment, an imaginary line connecting the center in the extending direction of the first magnet portion 521 and the center in the extending direction of the second magnet portion 522 may be perpendicular to the first surface 511 and the second surface 512.

[0374] The first magnet portion 521 includes a first facing surface 521a and a first opposite surface 521b.

[0375] The first facing surface 521a is defined as the side surface of the first magnet portion 521 facing the space portion 516. In other words, the first facing surface 521a may be defined as the side surface of the first magnet portion 521 facing the second magnet portion 522.

[0376] The first opposite face 521b is defined as the other side face of the first magnet portion 521 facing the first face 511. In other words, the first opposite face 521b can be defined as the other side face of the first magnet portion 521 facing the first facing face 521a.

[0377] The first facing face 521a and the first opposite face 521b are configured to have different polarities from each other. That is, the first facing face 521a can be magnetized to one of the N pole and the S pole, and the first opposite face 521b is magnetized to the other of the N pole and the S pole.

[0378] Thus, a magnetic field traveling from one of the first facing face 521a and the first opposite face 521b to the other face is formed by the first magnet portion 521 itself.

[0379] In the present embodiment, the polarity of the first facing face 521a can be configured to be the same as the polarity of the second facing face 522a of the second magnet portion 522. Thus, a magnetic field in a direction of mutual repulsion is formed between the first magnet portion 521 and the second magnet portion 522.

[0380] And, in the present embodiment, the polarity of the first facing face 521a can be configured to be the same as the polarity of the third facing face 523a of the third magnet portion 523. Thus, a magnetic field in a direction of mutual repulsion is also formed between the first magnet portion 521 and the third magnet portion 523.

[0381] The second magnet portion 522 forms a magnetic field together with the first magnet portion 521 or the third magnet portion 523. And the second magnet portion 522 itself can also form a magnetic field.

[0382] The second magnet portion 522 is disposed on one side in the direction in which it extends while being deflected inside the second face 512. At this time, the second magnet portion 522 is disposed at a position deflected to the same side as the first magnet portion 521 and is disposed facing each other.

[0383] In Figure 6 In the illustrated embodiment, the second magnet portion 522 is disposed on the left side while being deflected inside the second face 512. That is, the second magnet portion 522 is located at a position more to the left than the arc discharge hole 515.

[0384] In Figure 7 In the illustrated embodiment, the second magnet portion 522 is disposed on the right side while being deflected inside the second face 512. That is, the second magnet portion 522 is located at a position more to the right than the arc discharge hole 515.

[0385] In each embodiment, the second magnet portion 522 can form a magnetic field together with the first magnet portion 521 or the third magnet portion 523.

[0386] The second magnet portion 522 is disposed facing the first magnet portion 521. Specifically, the second magnet portion 522 faces the first magnet portion 521 with a space portion 516 therebetween.

[0387] In one embodiment, an imaginary straight line connecting the center in the extending direction of the second magnet portion 522 and the center in the extending direction of the first magnet portion 521 may be perpendicular to the second surface 512 and the first surface 511.

[0388] The second magnet portion 522 includes a second facing surface 522a and a second opposite surface 522b.

[0389] The second facing surface 522a is defined as the side surface of the second magnet portion 522 facing the space portion 516. In other words, the second facing surface 522a may be defined as the side surface of the second magnet portion 522 facing the first magnet portion 521.

[0390] The second opposite surface 522b is defined as the other side surface of the second magnet portion 522 facing the second surface 512. In other words, the second opposite surface 522b may be defined as the side surface of the second magnet portion 522 facing the second facing surface 522a.

[0391] The second facing surface 522a and the second opposite surface 522b are configured to have different polarities from each other. That is, the second facing surface 522a may be magnetized to one of the N pole and the S pole, and the second opposite surface 522b is magnetized to the other of the N pole and the S pole.

[0392] Thereby, a magnetic field traveling from one of the second facing surface 522a and the second opposite surface 522b to the other surface is formed by the second magnet portion 522 itself.

[0393] In the present embodiment, the polarity of the second facing surface 522a may be configured to be the same as the polarity of the first facing surface 521a of the first magnet portion 521. Thereby, a magnetic field in a direction of mutual repulsion is formed between the first magnet portion 521 and the second magnet portion 522.

[0394] Moreover, in the present embodiment, the polarity of the second facing surface 522a may be configured to be the same as the polarity of the third facing surface 523a of the third magnet portion 523. Thereby, a magnetic field in a direction of mutual repulsion is also formed between the first magnet portion 521 and the third magnet portion 523.

[0395] In the present embodiment, regarding the positional relationship between the first magnet portion 521 and the second magnet portion 522, it can be described by using the positional relationship between the first magnet portion 521 and the second magnet portion 522 and the fixed contact 220.

[0396] That is, in Figure 6In the illustrated embodiment, the first magnet portion 521 and the second magnet portion 522 are disposed adjacent to any one of the fixed contacts 220, that is, the second fixed contact 220b on the right side. The first magnet portion 521 and the second magnet portion 522 are configured to surround the rear side and the front side of the second fixed contact 220b, respectively.

[0397] In the embodiment, the third magnet portion 523 is disposed adjacent to the other fixed contact 220, that is, the first fixed contact 220a on the left side.

[0398] In Figure 7 In the illustrated embodiment, the first magnet portion 521 and the second magnet portion 522 are disposed adjacent to any one of the fixed contacts 220, that is, the first fixed contact 220a on the left side. The first magnet portion 521 and the second magnet portion 522 are configured to surround the rear side and the front side of the first fixed contact 220a, respectively.

[0399] In the embodiment, the third magnet portion 523 is disposed adjacent to the other fixed contact 220, that is, the second fixed contact 220b on the right side.

[0400] The third magnet portion 523 forms a magnetic field together with the first magnet portion 521 or the second magnet portion 522. Also, the third magnet portion 523 itself can form a magnetic field.

[0401] The magnetic force of the third magnet portion 523 can be greater than the magnetic force of the first magnet portion 521 or the second magnet portion 522.

[0402] In one embodiment, the magnetic force of the third magnet portion 523 can be more than twice the magnetic force of each of the first magnet portion 521 and the second magnet portion 522.

[0403] Thus, even if only the third magnet portion 523 is disposed adjacent to one of the fixed contacts 220, a magnetic field with sufficient strength can be formed for forming the arc path A.P.

[0404] The third magnet portion 523 is located in a direction opposite to the first magnet portion 521 or the second magnet portion 522. In other words, the third magnet portion 523 is located on one of the third surface 513 and the fourth surface 514 that is farther from the first magnet portion 521 or the second magnet portion 522.

[0405] In Figure 6 In the illustrated embodiment, the third magnet portion 523 is located inside the third surface 513. Also, the third magnet portion 523 is located in the middle portion in the front-rear direction in which the third surface 513 extends.

[0406] In Figure 7In the illustrated embodiment, the third magnet portion 523 is located inside the fourth surface 514. Moreover, the third magnet portion 523 is located in the middle part in the front - rear direction in which the fourth surface 514 extends.

[0407] The third magnet portion 523 is arranged at a predetermined distance from the first magnet portion 521 and the second magnet portion 522. In one embodiment, the distance between the third magnet portion 523 and the first magnet portion 521 may be the same as the distance between the third magnet portion 523 and the second magnet portion 522.

[0408] In other words, the distance between the center in the length direction in which the third magnet portion 523 extends and the center in the length direction in which the first magnet portion 521 extends may be the same as the distance between the center in the length direction in which the third magnet portion 523 extends and the center in the length direction in which the second magnet portion 522 extends.

[0409] In the present embodiment, the position of the third magnet portion 523 can be described by using the positional relationship between the third magnet portion 523 and the fixed contact 220.

[0410] That is, in Figure 6 the illustrated embodiment, the third magnet portion 523 is arranged adjacent to any one of the fixed contacts 220, that is, the first fixed contact 220a on the left side. The third magnet portion 523 is configured to surround the left side of the first fixed contact 220a.

[0411] In the said embodiment, the first magnet portion 521 and the second magnet portion 522 are arranged adjacent to the other fixed contact 220, that is, the second fixed contact 220b on the right side.

[0412] In Figure 7 the illustrated embodiment, the third magnet portion 523 is arranged adjacent to any one of the fixed contacts 220, that is, the second fixed contact 220b on the right side. The third magnet portion 523 is configured to surround the right side of the second fixed contact 220b.

[0413] In the said embodiment, the first magnet portion 521 and the second magnet portion 522 are arranged adjacent to the other fixed contact 220, that is, the first fixed contact 220a on the left side.

[0414] The third magnet portion 523 includes a third facing surface 523a and a third opposite surface 523b.

[0415] The third facing surface 523a is defined as the side surface of the third magnet portion 523 facing the space portion 516. In other words, the third facing surface 523a can be defined as the side surface of the third magnet portion 523 facing the first magnet portion 521 or the second magnet portion 522.

[0416] The third opposite surface 523b is defined as the other side of the third magnet portion 523 facing the third surface 513. In other words, the third opposite surface 523b can be defined as the side surface of the third magnet portion 523 facing the third facing surface 523a.

[0417] The third facing surface 523a and the third opposite surface 523b are configured to have different polarities from each other. That is, the third facing surface 523a can be magnetized to one of the N pole and the S pole, and the third opposite surface 523b is magnetized to the other pole of the N pole and the S pole.

[0418] Thus, a magnetic field traveling from one of the third facing surface 523a and the third opposite surface 523b to the other surface is formed by the third magnet portion 523 itself.

[0419] In the present embodiment, the polarity of the third facing surface 523a can be configured to be the same as the polarity of the first facing surface 521a of the first magnet portion 521. Thus, a magnetic field in a direction of mutual repulsion is formed between the third magnet portion 523 and the first magnet portion 521.

[0420] Moreover, the polarity of the third facing surface 523a can be configured to be the same as the polarity of the second facing surface 522a of the second magnet portion 522. Thus, a magnetic field in a direction of mutual repulsion is also formed between the third magnet portion 523 and the second magnet portion 522.

[0421] That is, in Figure 6 the (a) of Figure 7 and the embodiment shown in the (a) of Figure 6 each of the facing surfaces 521a, 522a, 523a is magnetized to the N pole. And in Figure 7 the (b) of

[0422] and the embodiment shown in the (b) of

[0423] (2) Description of the arc path forming portion 600 of another embodiment of the present invention

[0424] Hereinafter, with reference to Figure 8 and Figure 9 the arc path forming portion 600 of another embodiment of the present invention will be described in detail.

[0425] In the illustrated embodiment, the arc path forming portion 600 includes a magnet frame 610 and a magnet portion 620.

[0426] The structure and function of the magnet frame 610 in this embodiment are the same as those of the magnet frame 510 in the above embodiment. Therefore, the description of the magnet frame 610 will be replaced by the description of the magnet frame 510 above.

[0427] Moreover, the structure and function of the magnet part 620 in this embodiment are similar to those of the magnet part 520 in the above embodiment. However, there are differences in the polarities of the respective magnet parts 621, 622, and 623.

[0428] Therefore, in the following description, the magnet part 620 in this embodiment will be described centering on the differences from the magnet part 520 in the above embodiment.

[0429] In this embodiment, the magnet part 620 includes: a first magnet part 621, a second magnet part 622, and a third magnet part 623.

[0430] The structure and arrangement of the first magnet part 621 are the same as those of the first magnet part 521 in the above embodiment. The first magnet part 621 is arranged facing the second magnet part 622.

[0431] The first magnet part 621 is arranged on one side inside the first surface 611 and biased in the direction in which the first surface 611 extends. At this time, the first magnet part 621 is arranged on the same side as the second magnet part 622 and faces each other.

[0432] In Figure 8 the illustrated embodiment, the first magnet part 621 is located inside the first surface 611. Moreover, the first magnet part 621 is located at a position biased to the right. In other words, the first magnet part 621 is arranged adjacent to the second fixed contact 220b located on the right.

[0433] In Figure 9 the illustrated embodiment, the first magnet part 621 is located inside the first surface 611. Moreover, the first magnet part 621 is located at a position biased to the left. In other words, the first magnet part 621 is arranged adjacent to the first fixed contact 220a located on the left.

[0434] The first magnet part 621 includes a first facing surface 621a and a first opposite surface 621b.

[0435] The first facing surface 621a is defined as the side surface of the first magnet part 621 facing the space part 616. In other words, the first facing surface 621a can be defined as the side surface of the first magnet part 621 facing the second magnet part 622.

[0436] The first opposite surface 621b is defined as the other side surface of the first magnet portion 621 facing the first surface 611. In other words, the first opposite surface 621b can be defined as the other side surface of the first magnet portion 621 facing the first facing surface 621a.

[0437] The first facing surface 621a and the first opposite surface 621b are configured to have different polarities from each other. That is, the first facing surface 621a can be magnetized to one of the N pole and the S pole, while the first opposite surface 621b is magnetized to the other of the N pole and the S pole.

[0438] Thus, a magnetic field traveling from one of the first facing surface 621a and the first opposite surface 621b to the other surface is formed by the first magnet portion 621 itself.

[0439] In the present embodiment, the polarity of the first facing surface 621a can be configured to be the same as the polarity of the second facing surface 622a of the second magnet portion 622. Thus, a magnetic field in a direction of mutual repulsion is formed between the first magnet portion 621 and the second magnet portion 622.

[0440] In addition, in the present embodiment, the polarity of the first facing surface 621a can be configured to be different from the polarity of the third facing surface 623a of the third magnet portion 623. Thus, a magnetic field in a direction of mutual attraction is formed between the first magnet portion 621 and the third magnet portion 623.

[0441] In Figure 8 's (a) and Figure 9 's (a) shown embodiment, the first facing surface 621a and the second facing surface 622a are magnetized to the S pole. At this time, the third facing surface 623a is magnetized to the N pole.

[0442] In Figure 8 's (b) and Figure 9 's (b) shown embodiment, the first facing surface 621a and the second facing surface 622a are magnetized to the N pole. At this time, the third facing surface 623a is magnetized to the S pole.

[0443] The structure and arrangement of the second magnet portion 622 are the same as those of the second magnet portion 522 in the above embodiment. The second magnet portion 622 is arranged facing the first magnet portion 621.

[0444] The second magnet portion 622 is arranged on one side in the direction in which the second magnet portion 622 extends while being biased inside the second surface 612. At this time, the second magnet portion 622 is arranged on the same side as the first magnet portion 621 and faces each other.

[0445] In Figure 8In the illustrated embodiment, the second magnet portion 622 is located inside the second surface 612. Moreover, the second magnet portion 622 is located at a position biased to the right. In other words, the second magnet portion 622 is disposed adjacent to the second fixed contact 220b located on the right side.

[0446] In Figure 9 the illustrated embodiment, the second magnet portion 622 is located inside the second surface 612. Moreover, the second magnet portion 622 is located at a position biased to the left. In other words, the second magnet portion 622 is disposed adjacent to the first fixed contact 220a located on the left side.

[0447] The second magnet portion 622 includes a second facing surface 622a and a second opposite surface 622b.

[0448] The second facing surface 622a is defined as the side surface of the second magnet portion 622 facing the space portion 616. In other words, the second facing surface 622a can be defined as the side surface of the second magnet portion 622 facing the first magnet portion 621.

[0449] The second opposite surface 622b is defined as the other side surface of the second magnet portion 622 facing the second surface 612. In other words, the second opposite surface 622b can be defined as the other side surface of the second magnet portion 622 facing the second facing surface 622a.

[0450] The second facing surface 622a and the second opposite surface 622b are configured to have different polarities from each other. That is, the second facing surface 622a can be magnetized to one of the N pole and the S pole, while the second opposite surface 622b is magnetized to the other of the N pole and the S pole.

[0451] Thus, a magnetic field traveling from one of the second facing surface 622a and the second opposite surface 622b to the other surface is formed by the second magnet portion 622 itself.

[0452] In the present embodiment, the polarity of the second facing surface 622a can be configured to be the same as the polarity of the first facing surface 621a of the first magnet portion 621. Thus, a magnetic field in a direction of mutual repulsion is formed between the second magnet portion 622 and the first magnet portion 621.

[0453] Moreover, in the present embodiment, the polarity of the second facing surface 622a can be configured to be different from the polarity of the third facing surface 623a of the third magnet portion 623. Thus, a magnetic field in a direction of mutual attraction is formed between the second magnet portion 622 and the third magnet portion 623.

[0454] In Figure 8 of (a) and Figure 9In the embodiment shown in (a), the second facing surface 622a and the first facing surface 621a are magnetized to the S pole. At this time, the third facing surface 623a is magnetized to the N pole.

[0455] In Figure 8 the (b) of Figure 9 In the embodiment shown in (b), the second facing surface 622a and the first facing surface 621a are magnetized to the N pole. At this time, the third facing surface 623a is magnetized to the S pole.

[0456] The structure and arrangement of the third magnet part 623 are the same as those of the third magnet part 523 in the above embodiment. The third magnet part 623 is arranged oppositely to the first magnet part 621 or the second magnet part 622.

[0457] The third magnet part 623 is located in the direction opposite to the first magnet part 621 and the second magnet part 622. In other words, the third magnet part 623 is located on one of the third surface 613 and the fourth surface 614 that is farther from the first magnet part 621 or the second magnet part 622.

[0458] The magnetic force of the third magnet part 623 can be greater than the magnetic force of the first magnet part 621 or the second magnet part 622.

[0459] In one embodiment, the magnetic force of the third magnet part 623 can be more than twice as strong as the magnetic force of each of the first magnet part 621 and the second magnet part 622.

[0460] Thus, even if only the third magnet part 623 is arranged adjacent to one of the fixed contacts 220, a magnetic field with sufficient strength can be formed to form the arc path A.P.

[0461] In Figure 8 In the embodiment shown, the third magnet part 623 is located inside the third surface 613. And the third magnet part 623 is located in the middle part in the front - rear direction in which the third surface 613 extends.

[0462] In Figure 9 In the embodiment shown, the third magnet part 623 is located inside the fourth surface 614. And the fourth magnet part 624 is located in the middle part in the front - rear direction in which the fourth surface 614 extends.

[0463] The third magnet part 623 includes a third facing surface 623a and a third opposite surface 623b.

[0464] The third facing surface 623a is defined as the side surface of the third magnet part 623 facing the space part 616. In other words, the third facing surface 623a can be defined as the side surface of the third magnet part 623 facing the first magnet part 621 or the second magnet part 622.

[0465] The third opposite surface 623b is defined as the other side surface of the third magnet portion 623 facing the third surface 613. In other words, the third opposite surface 623b can be defined as the side surface of the third magnet portion 623 facing the third facing surface 623a.

[0466] The third facing surface 623a and the third opposite surface 623b are configured to have different polarities from each other. That is, the third facing surface 623a is magnetized to one of the N pole and the S pole, and the third opposite surface 623b is magnetized to the other of the N pole and the S pole.

[0467] Thereby, a magnetic field traveling from one of the third facing surface 623a and the third opposite surface 623b to the other surface is formed by the third magnet portion 623 itself.

[0468] In the present embodiment, the polarity of the third facing surface 623a can be configured to be different from the polarity of the first facing surface 621a of the first magnet portion 621. Thereby, a magnetic field in the direction of mutual attraction is formed between the third magnet portion 623 and the first magnet portion 621.

[0469] In addition, the polarity of the third facing surface 623a can be configured to be different from the polarity of the second facing surface 622a of the second magnet portion 622. Thereby, a magnetic field in the direction of mutual attraction is formed between the third magnet portion 623 and the second magnet portion 622.

[0470] In Figure 8 the (a) of Figure 9 and the embodiment shown in the (a) of

[0471] In Figure 8 the (b) of Figure 9 and the embodiment shown in the (b) of

[0472] the third facing surface 623a is magnetized to the N pole. At this time, the first facing surface 621a and the second facing surface 622a are magnetized to the S pole.

[0473] 4. Description of the arc path A.P formed by the arc path forming portions 500 and 600 of the embodiments of the present invention

[0474] The DC relay 10 of the embodiments of the present invention includes arc path forming portions 500 and 600. The arc path forming portions 500 and 600 form a magnetic field inside the arc chamber 210.

[0475] In a state where the magnetic field is formed, when the fixed contact 220 and the movable contact 430 are in contact to conduct an electric current, an electromagnetic force is generated according to Fleming's left hand rule. The electromagnetic force can be defined as the Lorentz force.

[0476] Under the action of the electromagnetic force, an arc path A.P can be formed to move the arc generated due to the separation of the fixed contact 220 and the movable contact 430.

[0477] Hereinafter, with reference to Figures 10 to 17 The process of forming the arc path A.P in the DC relay 100 according to an embodiment of the present invention will be described in detail.

[0478] In the following description, it is assumed that an arc is generated at the portion where the fixed contact 220 and the movable contact 430 have contacted immediately after the fixed contact 220 and the movable contact 430 are separated.

[0479] In the following description, the magnetic field formed between the different magnet portions 520 and 620 is set as the "main magnetic field (M.M.F, Main Magnetic Field)", and the magnetic fields formed by the respective magnet portions 520 and 620 themselves are set as the "sub magnetic fields (S.M.F, Sub Magnetic Field)".

[0480] (1) Description of the arc path A.P formed by the arc path forming portion 500 according to an embodiment of the present invention

[0481] With reference to Figures 10 to 13 , the direction of the arc path A.P formed by the arc path forming portion 500 according to an embodiment of the present invention is shown.

[0482] In this embodiment, the facing surfaces 521a, 522a, and 523a facing each other in each magnet portion 520 are magnetized to the same polarity.

[0483] Figure 10 of (a), Figure 11 of (a), Figure 12 of (a) and Figure 13 of (a), the direction of the electric current is such that the current flows into the second fixed contact 220b, passes through the movable contact 430, and then flows out through the first fixed contact 220a.

[0484] Figure 10 of (b), Figure 11 of (b), Figure 12 of (b) and Figure 13The current conduction direction in (b) is such that the current flows into the first fixed contact 220a, passes through the movable contact 430, and then flows out via the second fixed contact 220b.

[0485] Referring to Figure 10 , the first facing surface 521a, the second facing surface 522a, and the third facing surface 523a are all magnetized to the N pole.

[0486] As is well known, a magnetic field is formed along the direction that diverges from the N pole and converges to the S pole.

[0487] Therefore, a main magnetic field M.M.F. in a direction of mutual repulsion is formed between the first magnet portion 521, the second magnet portion 522, and the third magnet portion 523.

[0488] Specifically, in Figure 10 (a), Figure 10 (b), Figure 12 (a), and Figure 12 (b) of the illustrated embodiments, a main magnetic field M.M.F. in a direction of divergence from each other is formed between the respective magnet portions 521, 522, 523.

[0489] Similarly, in Figure 11 (a), Figure 11 (b), Figure 13 (a), and Figure 13 (b) of the illustrated embodiments, a main magnetic field M.M.F. in a direction of convergence towards itself is formed between the respective magnet portions 521, 522, 523.

[0490] On the other hand, each of the magnet portions 521, 522, 523 forms an auxiliary magnetic field S.M.F. formed by itself.

[0491] Specifically, in Figure 10 (a), Figure 10 (b), Figure 12 (a), and Figure 12 (b) of the illustrated embodiments, an auxiliary magnetic field S.M.F. in a direction from each of the facing surfaces 521a, 522a, 523a towards each of the opposite surfaces 521b, 522b, 523b is formed in each of the magnet portions 521, 522, 523.

[0492] Similarly, in Figure 11 (a), Figure 11 (b), Figure 13 (a), and Figure 13In the embodiment shown in FIG. (b), each magnet portion 521, 522, 523 forms a sub-magnetic field S.M.F in the direction from each opposite surface 521b, 522b, 523b toward each facing surface 521a, 522a, 523a.

[0493] It can be understood that the direction of the sub-magnetic field S.M.F formed by each magnet portion 521, 522, 523 is the same as the direction of the main magnetic field M.M.F formed between each magnet portion 521, 522, 523.

[0494] Therefore, the sub-magnetic field S.M.F can be used to strengthen the intensity of the main magnetic field M.M.F formed between each magnet portion 521, 522, 523.

[0495] Accordingly, the direction of the electromagnetic force, i.e., the Lorentz force, generated in each of the illustrated embodiments and the path A.P of the arc formed thereby will be described in detail as follows.

[0496] In Figure 10 (a), Figure 11 (b), Figure 12 (b) and Figure 13 (a) of the illustrated embodiments, the path A.P of the arc formed near the first fixed contact 220a is formed to the left or right side in the rear direction. At this time, the path A.P of the arc formed near the second fixed contact 220b is formed to the left or right side in the front direction.

[0497] In Figure 10 (b), Figure 11 (a), Figure 12 (a) and Figure 13 (b) of the illustrated embodiments, the path A.P of the arc formed near the first fixed contact 220a is formed to the left or right side in the front direction. At this time, the path A.P of the arc formed near the second fixed contact 220b is formed to the left or right side in the rear direction.

[0498] That is, the path A.P of the arc formed near the first fixed contact 220a by the arc path forming portion 500 of the present embodiment is formed to one side of the front side and the rear side. On the other hand, the path A.P of the arc formed near the second fixed contact 220b is formed to the other side of the front side and the rear side.

[0499] Therefore, the arc paths A.P formed near each fixed contact 220a, 220b will not overlap with each other. Thus, it is possible to prevent damage to the arc path forming portion 600 and the DC relay 10 that may occur due to the overlap of the arc paths A.P.

[0500] Furthermore, the path A.P of the arc is formed along a direction away from the central portion C. Accordingly, various structural elements of the DC relay 10 disposed in the central portion C can be prevented from being damaged.

[0501] (2) Description of the arc path A.P formed by the arc path forming portion 600 of another embodiment of the present invention

[0502] Refer to Figures 14 to 17 , which shows the direction of the arc path A.P formed by the arc path forming portion 600 of another embodiment of the present invention.

[0503] In the present embodiment, the opposing surfaces 621a and 622a of the first magnet portion 621 and the second magnet portion 622 that face each other are magnetized to have the same polarity. In addition, the third opposing surface 623a of the third magnet portion 623 that faces the first magnet portion 621 and the second magnet portion 622 is magnetized to have a polarity different from that of the first opposing surface 621a and the second opposing surface 622a.

[0504] Figure 14 of (a), Figure 15 of (a), Figure 16 of (a), Figure 17 The current conduction direction in (a) of is such that the current flows into the second fixed contact 220b, passes through the movable contact 430, and then flows out via the first fixed contact 220a.

[0505] Figure 14 of (b), Figure 15 of (b), Figure 16 of (b), Figure 17 The current conduction direction in (b) of is such that the current flows into the first fixed contact 220a, passes through the movable contact 430, and then flows out via the second fixed contact 220b.

[0506] Refer to Figure 14 The first opposing surface 621a and the second opposing surface 622a are magnetized to the S pole. And the third opposing surface 623a is magnetized to the N pole.

[0507] As is well known, the magnetic field is formed along the direction diverging from the N pole and converging to the S pole.

[0508] Accordingly, a main magnetic field M.M.F in the direction from the third magnet portion 623 toward the first magnet portion 621 is formed between the first magnet portion 621 and the third magnet portion 623. Also, a main magnetic field M.M.F in the direction from the third magnet portion 623 toward the second magnet portion 622 is formed between the second magnet portion 622 and the third magnet portion 623.

[0509] Similarly, in Figure 16In the illustrated embodiment, a main magnetic field M.M.F is formed between the first magnet portion 621 and the third magnet portion 623 in the direction from the third magnet portion 623 toward the first magnet portion 621. Also, a main magnetic field M.M.F is formed between the second magnet portion 622 and the third magnet portion 623 in the direction from the third magnet portion 623 toward the second magnet portion 622.

[0510] Referring to Figure 15 , the first facing surface 621a and the second facing surface 622a are magnetized to the N pole. And the third facing surface 623a is magnetized to the S pole.

[0511] As is well known, a magnetic field is formed along the direction that diverges from the N pole and converges to the S pole.

[0512] Therefore, a main magnetic field M.M.F is formed between the first magnet portion 621 and the third magnet portion 623 in the direction from the first magnet portion 621 toward the third magnet portion 623. Also, a main magnetic field M.M.F is formed between the second magnet portion 622 and the third magnet portion 623 in the direction from the third magnet portion 623 toward the second magnet portion 622.

[0513] Similarly, in Figure 17 the illustrated embodiment, a main magnetic field M.M.F is also formed between the first magnet portion 621 and the third magnet portion 623 in the direction from the first magnet portion 621 toward the third magnet portion 623. Also, a main magnetic field M.M.F is formed between the second magnet portion 622 and the third magnet portion 623 in the direction from the third magnet portion 623 toward the second magnet portion 622.

[0514] On the other hand, each magnet portion 621, 622, 623 forms a sub-magnetic field S.M.F formed by itself.

[0515] Specifically, in Figure 14 the (a) of Figure 14 the (b) of Figure 16 the (a) of Figure 16 and the (b) of

[0516] the illustrated embodiment, the first magnet portion 621 forms a sub-magnetic field S.M.F in the direction from the first opposite surface 621b toward the first facing surface 621a. The second magnet portion 622 forms a sub-magnetic field S.M.F in the direction from the second opposite surface 622b toward the second facing surface 622a, and the third magnet portion 623 forms a sub-magnetic field S.M.F in the direction from the third facing surface 623a toward the third opposite surface 623b. Figure 15 the (a) of Figure 15 the (b) of Figure 17 the (a) of Figure 17In the embodiment shown in (b), the first magnet portion 621 forms an auxiliary magnetic field S.M.F in the direction from the first facing surface 621a toward the first opposite surface 621b. The second magnet portion 622 forms an auxiliary magnetic field S.M.F in the direction from the second facing surface 622a toward the second opposite surface 622b, and the third magnet portion 623 forms an auxiliary magnetic field S.M.F in the direction from the third opposite surface 623b toward the third facing surface 623a.

[0517] It can be understood that the direction of the auxiliary magnetic field S.M.F formed by each of the magnet portions 621, 622, 623 is the same as the direction of the main magnetic field M.M.F formed between the magnet portions 621, 622, 623.

[0518] Therefore, the auxiliary magnetic field S.M.F can be used to strengthen the intensity of the main magnetic field M.M.F formed between the magnet portions 621, 622, 623.

[0519] Accordingly, the direction of the electromagnetic force, i.e., the Lorentz force, generated in each of the illustrated embodiments and the path A.P of the arc formed thereby will be described in detail as follows.

[0520] In Figure 14 (a), Figure 15 (b), Figure 16 (a) and Figure 17 (b) of the illustrated embodiments, the path A.P of the arc formed near the first fixed contact 220a is formed to the left rearward. At this time, the path A.P of the arc formed near the second fixed contact 220b is formed to the right forward.

[0521] In Figure 14 (b), Figure 15 (a), Figure 16 (b) and Figure 17 (a) of the illustrated embodiments, the path A.P of the arc formed near the first fixed contact 220a is formed to the left forward. At this time, the path A.P of the arc formed near the second fixed contact 220b is formed to the right rearward.

[0522] That is, the path A.P of the arc formed near the first fixed contact 220a by the arc path forming portion 600 of the present embodiment is formed to the left on the front side or the left on the rear side. On the other hand, the path A.P of the arc formed near the second fixed contact 220b is formed to the right on the front side or the right on the rear side.

[0523] Therefore, the paths A.P of the arcs formed near the respective fixed contacts 220a, 220b are formed in directions away from each other. That is, the paths A.P of the arcs formed near the respective fixed contacts 220a, 220b do not overlap each other at a specific location.

[0524] Thereby, it is possible to minimize the damage to the arc path forming portion 600 and the DC relay 10 caused by the generated arcs.

[0525] The path A.P of the arc as described above can be formed along the tendency of the electromagnetic forces formed while being separated from each other. And, as described above, by using the rib portion 617 formed in the central portions of the first surface 611 and the second surface 612, it is possible to prevent the distortion of an unintended arc.

[0526] Therefore, the paths A.P of the arcs formed near the respective fixed contacts 220a, 220b will not overlap each other. Thereby, it is possible to prevent the damage to the arc path forming portion 600 and the DC relay 10 that may occur due to the overlap of the arc paths A.P.

[0527] In addition, the arc path A.P is formed along a direction away from the central portion C. Therefore, it is possible to prevent various structural elements of the DC relay 10 disposed at the central portion C from being damaged.

[0528] As described above, the present invention has been described with reference to the preferred embodiments. However, for those of ordinary skill in the art, various modifications and changes can be made to the present invention without departing from the technical idea of the present invention described in the following claims.

Claims

1. An arc path forming part wherein it includes a magnet frame with a space formed inside it, and the magnet frame has a plurality of faces surrounding the space; and a magnet part combined with the plurality of faces and forming a magnetic field in the space, the magnet frame includes a first face extending along one direction; a second face facing the first face and extending along the one direction; and a third face extending between one end of the first face and one end of the second face, the magnet part includes a first magnet part located on the first face; a second magnet part arranged on the second face facing the first magnet part; and a third magnet part located on the third face, a first facing face of the first magnet part facing the second magnet part and a second facing face of the second magnet part facing the first magnet part have the same polarity, a third facing face of the third magnet part facing the first magnet part or the second magnet part has a polarity different from that of the first facing face and the second facing face, the magnetic force of the third magnet part is greater than the magnetic forces of the first magnet part and the second magnet part.

2. A DC relay ， wherein it includes a fixed contact; a movable contact that contacts or separates from the fixed contact; and an arc path forming part with a space formed inside it for accommodating the fixed contact and the movable contact, and configured to form a magnetic field in the space to form a discharge path for the arc generated when the fixed contact and the movable contact are separated, the arc path forming part includes a magnet frame with a space part formed inside it, and the magnet frame has a plurality of faces surrounding the space part; and a magnet part combined with the plurality of faces and forming a magnetic field in the space part, the magnet frame includes a first face extending along one direction; a second face facing the first face and extending along the one direction; a third face extending between one end of the first face and one end of the second face; and a fourth face facing the third face and extending between the other end of the first face and the other end of the second face, the magnet part includes a first magnet part located on the first face; a second magnet part arranged on the second face facing the first magnet part; and a third magnet part located on one of the third face and the fourth face and extending between the first face and the second face, a first facing face of the first magnet part facing the second magnet part and a second facing face of the second magnet part facing the first magnet part have the same polarity, a third facing face of the third magnet part facing the space part has a polarity different from that of the first facing face and the second facing face, the magnetic force of the third magnet part is greater than the magnetic forces of the first magnet part and the second magnet part.

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