DC relay

Abstract

A DC relay is disclosed. The DC relay of an embodiment of the present invention includes a magnetic force forming part accommodated inside a frame part. The magnetic force forming part includes a first magnet member and a second magnet member. A magnetic force strengthening member is provided between the first magnet member and the second magnet member. The magnetic force strengthening member is configured to enhance the magnetic field formed between the first magnet member and the second magnet member. Therefore, the flow of the magnetic field formed inside the arc chamber is enhanced, so that an extinguishing path of the arc can be effectively formed. The magnetic force strengthening member can apply an electromagnetic attraction force to the movable core. Thus, the movable core not only receives the electromagnetic attraction force generated by the magnetization of the fixed core, but also receives the electromagnetic attraction force applied by the magnetic force strengthening member. Therefore, the driving force for moving the movable core is increased, so that the operation reliability of the movable core can be improved.

Description

Technical Field

[0001] The present invention relates to a DC relay, and more particularly to a DC relay that can form the direction of an electromagnetic force for extinguishing an arc regardless of the polarity of a fixed contact and has a structure capable of increasing a driving force that moves a movable contact to contact a fixed contact. Background Art

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

[0003] Reference Figures 1 to 3 The conventional DC relay 1000 includes a contact portion 1100 , a permanent magnet 1200 , and a core portion 1300 .

[0004] The contact unit 1100 includes a fixed contact 1110 and a movable contact 1120. When a control power source is applied, the movable contact 1120 moves to make contact with the fixed contact 1110. Thus, the DC relay 1000 can be energized with an external power source and a load.

[0005] The driving force for moving the movable contact 1120 is generated by the core 1300. When the control power is applied, the coil 1350 wound around the bobbin 1340 forms an electromagnetic field. At this time, the fixed core 1310 is magnetized, and an attractive force is generated between the fixed core 1310 and the movable core 1320.

[0006] Since the fixed core 1310 is fixed, the movable core 1320 moves toward the fixed core 1310. At this time, the shaft 1330 connected to the movable core 1320 and the movable core 1320 connected to the shaft 1330 move upward at the same time. Thus, the fixed contact 1110 and the movable contact 1120 can contact.

[0007] If the control power supply is released, the attraction between the fixed core 1310 and the movable core 1320 disappears. As the movable core 1320 moves upward, the spring 1321 is compressed and stores the restoring force, and then is stretched when the attraction disappears. As a result, the fixed contact 1110 and the movable contact 1120 are separated from each other and an arc is generated.

[0008] The generated arc is extinguished through a preset path, and needs to be discharged to the outside of the DC relay 1000. To this end, the DC relay 1000 includes a permanent magnet 1200 for forming an electromagnetic field.

[0009] Reference Figure 1(a) , a plurality of fixed contacts 1110 are provided. Current flows into the inside through the fixed contact 1110a on the right side, and then flows to the outside through the fixed contact 1110b on the left side through the movable contact 1120.

[0010] At this time, the permanent magnet 1200 is disposed outside each of the fixed contacts 1110a and 1110b to form a magnetic field.

[0011] Reference Figure 2 , showing the direction of the current flow and the direction of the force generated by the magnetic field. That is, the current is like Figure 1 is applied to the fixed contact 1110a on the right side as shown in (a).

[0012] The right permanent magnet 1200a is arranged with its S pole facing inward, and the left permanent magnet 1200b is arranged with its N pole facing inward. Thus, a magnetic field is formed in a direction from the left side to the right side.

[0013] According to Fleming's left-hand rule, the electromagnetic force, magnetic field, and current are formed at right angles to each other. Therefore, by the current application and the configuration of the permanent magnet 1200 as described above, the electromagnetic force is formed in the A direction. As a result, the arc moves along the A direction and is extinguished. On the contrary, if the current is applied to the fixed contact 1110b on the left side, the electromagnetic force is formed in the B direction, respectively.

[0014] At this time, the electromagnetic force formed by the permanent magnets 1200 is inversely proportional to the square of the distance between the permanent magnets 1200. Therefore, if the distance between the permanent magnets 1200 increases, an electromagnetic force insufficient to form an extinguishing path of the arc may be generated.

[0015] In addition, the strength of the magnetic field formed by the permanent magnet 1200 is affected by the size and thickness of the permanent magnet 1200. However, considering the limited space inside the DC relay 1000, it is difficult to increase the size and thickness of the permanent magnet 1200 indefinitely.

[0016] Therefore, due to space limitations, the size and thickness of the permanent magnets 1200 and the spacing between the permanent magnets 1200 are subject to many restrictions. Therefore, a solution for ensuring the magnetic force between the permanent magnets 1200 is needed.

[0017] In addition, refer to Figure 3 , shows the direction of the driving force for moving the movable core 1320 generated as the control power is applied. At this time, the attraction generated between the fixed core 1310 and the movable core 1320 should be greater than the elastic force generated by the compression of the return spring 1130 and the spring 1321.

[0018] However, due to factors such as the use environment, a sufficient attractive force may not be generated between the fixed core 1310 and the movable core 1320 . This is because the moving force of the movable core 1320 depends only on the electromagnetic attractive force between the fixed core 1310 and the movable core 1320 .

[0019] Therefore, a solution capable of sufficiently ensuring the electromagnetic attraction force generated between the fixed core 1310 and the movable core 1320 is required.

[0020] A DC relay including a damping magnet is disclosed in Korean registered patent document No. 10-1216824. Specifically, a DC relay including a damping magnet is disclosed, and the damping magnet is disposed on the lower side of a movable contact. When the DC relay is in an on state, the damping magnet is used to offset the magnetic flux induced around the movable contact to prevent the movable contact from being separated from the fixed contact at will.

[0021] However, this type of DC relay has the limitation that the formation of magnetic flux for extinguishing the arc is not considered. That is, although the random separation of each contact can be prevented, there is no disclosure about the solution for extinguishing the generated arc and for ensuring the extinguishing path. In addition, the document does not propose a solution for ensuring the magnetic force between the permanent magnets.

[0022] Korean registered patent document No. 10-1661396 discloses an electromagnetic relay having a structure capable of holding a permanent magnet at a desired position. Specifically, an electromagnetic relay having the following structure is disclosed: a first plate-shaped member and a second plate-shaped member are arranged around the permanent magnet, and each plate-shaped member supports the permanent magnet, thereby being able to hold the position of the permanent magnet.

[0023] However, this type of electromagnetic relay has a limitation in that, although the position of the permanent magnet can be maintained, no consideration is given to a scheme for changing the direction of the magnetic flux formed by the permanent magnet.

[0024] Furthermore, the above-mentioned type of relay is limited in that there is no solution for increasing the driving force for moving the movable contact. In addition, there is the inconvenience that the power and load applied to the fixed contact are limited to a specific direction due to the influence of the polarity of the permanent magnet.

[0025] Korean registered patent document No. 10-1216824 (2012.12.28.)

[0026] Korean registered patent document No. 10-1661396 (2016.09.29) Summary of the invention

[0027] Problems to be solved by the invention

[0028] An object of the present invention is to provide a DC relay having a structure capable of solving the above-mentioned problems.

[0029] First, an object is to provide a DC relay having a structure capable of sufficiently enhancing the strength of a magnetic field formed in an internal space.

[0030] Another object is to provide a DC relay having a structure capable of increasing the intensity of a magnetic field without excessively changing the arrangement method of components.

[0031] Another object is to provide a DC relay having a structure capable of forming a sufficient magnetic field without changing the position of a permanent magnet provided in an internal space or without increasing the size or thickness.

[0032] Another object is to provide a DC relay having a structure capable of configuring the moving direction of an arc extinguished inside the DC relay to be various.

[0033] In addition, an object is to provide a DC relay having a structure in which the direction of current applied to a fixed contact is not restricted by the polarity of a permanent magnet.

[0034] In addition, an object is to provide a DC relay having a structure capable of enhancing a driving force for moving a movable contact.

[0035] Another object is to provide a DC relay having a structure capable of reducing the size of a control power supply applied for moving a movable contact.

[0036] Technical solutions to the problem

[0037] In order to achieve the above-mentioned purpose, the present invention provides a DC relay, comprising: a fixed contact; a movable contact, which is extended in the length direction and one side of which is located adjacent to the fixed contact so as to contact with or be separated from the fixed contact; a plurality of magnet components, respectively located near the two side ends of the movable contact in the length direction so as to form a magnetic field; and a magnetic force strengthening component, which is located between the plurality of magnet components and forms a magnetic field together with the plurality of magnet components.

[0038] In addition, the magnetic force reinforcing member of the DC relay may be located on the other side of the movable contact opposite to the one side of the movable contact.

[0039] In addition, the fixed contacts of the DC relay may include: a first fixed contact, located at a position deviated to one side from the center of the length direction of the movable contact; and a second fixed contact, located at a position deviated to the other side opposite to the one side from the center of the length direction of the movable contact.

[0040] In addition, the magnetic force reinforcing member of the DC relay may be located between the first fixed contact and the second fixed contact in the longitudinal direction of the movable contact.

[0041] In addition, either one of the first fixed contact and the second fixed contact of the DC relay can be connected to an external power source in an energized manner, and the other one of the first fixed contact and the second fixed contact can be connected to an external load in an energized manner.

[0042] In addition, the multiple magnet components of the DC relay may include: a first magnet component, located near a position on one side end of the movable contact in the length direction; and a second magnet component, located near a position on the other side end relative to the one side end of the movable contact in the length direction.

[0043] In addition, the first magnet member and the second magnet member of the DC relay may have the same polarity on the sides facing each other.

[0044] In addition, the side of the magnetic force reinforcing member of the DC relay facing the movable contact may be configured to have a polarity different from a polarity of each of the first magnet member and the second magnet member on one side.

[0045] In addition, the direction of the magnetic field formed by the first magnet component, the second magnet component and the magnetic force strengthening component of the DC relay can be any one of a first direction and a second direction, the first direction being the direction from the first magnet component and the second magnet component toward the magnetic force strengthening component, and the second direction being the direction from the magnetic force strengthening component toward the first magnet component and the second magnet component.

[0046] In addition, the present invention provides a DC relay, comprising: a fixed contact; a movable contact, one side of which is in contact with the fixed contact or separated from the fixed contact; a fixed core, located on the other side of the movable contact opposite to the one side, and being magnetized when a control power is applied; a movable core, located on the other side of the fixed core opposite to the side of the fixed core close to the movable contact, and moving toward the fixed core when the control power is applied; and a magnetic force strengthening member, located between the movable contact and the fixed core, applying an attractive force to the movable core in the direction of the fixed core.

[0047] In addition, the DC relay may include a coil arranged to surround the fixed core and the movable core and configured to form an electromagnetic field when the control power source is applied, and the fixed core may be magnetized by the electromagnetic field formed by the coil.

[0048] Furthermore, when the fixed core of the DC relay is magnetized, the fixed core may apply an attractive force toward the fixed core to the movable core, and the magnetic force reinforcing member may apply an attractive force toward the magnetic force reinforcing member to the movable core.

[0049] In addition, the present invention provides a DC relay, comprising: a fixed contact; a movable contact, one side of which is located adjacent to the fixed contact, so as to contact or be separated from the fixed contact to allow or prevent energization; a shaft, which is extended in the length direction and connected to the movable contact, and moves together with the movable contact in a direction toward the fixed contact or in a direction separated from the fixed contact; a fixed core, which is located on the other side of the movable contact opposite to the one side of the movable contact, the shaft is connected to the fixed core, and the fixed core is magnetized when a control power supply is applied; a movable core, which is located on the other side of the fixed core opposite to the side of the fixed core close to the movable contact, and moves toward the fixed core when a control power supply is applied, and the shaft is connected to the movable core; and a magnetic force strengthening member, which is located between the fixed core and the movable contact, the shaft is connected to the magnetic force strengthening member in a movable manner, and is configured to apply an attractive force to the movable core.

[0050] In addition, the DC relay may include a plurality of magnet components, the plurality of magnet components are respectively located near the two side ends in the length direction of the movable contact, and are configured to form a magnetic field between the plurality of magnet components, and the magnetic force strengthening component can form a magnetic field together with the plurality of magnet components.

[0051] In addition, the sides of the multiple magnet components of the DC relay facing each other may have the same polarity, and the side of the magnetic force strengthening component facing the movable contact may have a polarity different from the polarity of one side of the multiple magnet components.

[0052] In addition, the magnetic force strengthening member of the DC relay may have a cylindrical shape extending in the length direction, a hollow portion penetrating in the length direction may be provided at the center of the magnetic force strengthening member, and the shaft may be connected to the hollow portion through the hollow portion.

[0053] Effects of the Invention

[0054] According to the present invention, the following effects can be achieved.

[0055] First, the magnetic force reinforcing member provided between the permanent magnets is configured to strengthen the magnetic field generated by the permanent magnets.

[0056] Therefore, the magnetic field formed inside the DC relay can be sufficiently strengthened.

[0057] In addition, the magnetic force strengthening member is provided so as to penetrate and couple with the shaft. The magnetic force strengthening member penetrating and coupling with the shaft is configured to be located on the upper side of the fixed core.

[0058] Therefore, the magnetic force reinforcing member can be easily installed and connected. In addition, the magnetic force reinforcing member for reinforcing the strength of the magnetic field can be installed without excessively changing the internal structure of the DC relay.

[0059] In addition, the magnetic force reinforcing member is configured to strengthen the magnetic field formed by the permanent magnets. In other words, the magnetic force reinforcing member is arranged to form a magnetic field in the same direction as the magnetic field formed by the permanent magnets.

[0060] Therefore, a sufficient magnetic field can be formed without changing the position of the permanent magnet itself or increasing the size or thickness of the permanent magnet in order to increase the magnetic force of the permanent magnet.

[0061] In addition, the magnetic field formed inside the DC relay is formed in a direction toward or from the magnetic force strengthening member, rather than in a direction from any one permanent magnet toward another permanent magnet. In other words, the directions of the magnetic fields formed around the fixed contacts can be different from each other.

[0062] Therefore, a magnetic field can be formed in multiple directions inside the DC relay, so that the arc extinguishing direction can also be configured in multiple directions.

[0063] In addition, the magnetic field formed inside the DC relay is formed in a direction that is concentrated toward the magnetic force reinforcing member or radiated from the magnetic force reinforcing member. Therefore, the arc is subjected to electromagnetic force in the same direction with respect to each fixed contact.

[0064] Therefore, even if the direction of the current applied to the fixed contact is changed, the arc is induced to be extinguished in the same direction. Therefore, the user does not need to connect the DC relay according to the polarity, so that the convenience of the user can be improved.

[0065] In addition, the magnetic force reinforcing member is located adjacent to the fixed core. When the fixed core is magnetized by the electromagnetic field generated when the coil is energized, the magnetic force reinforcing member can also apply an attractive force to the movable core.

[0066] Therefore, the attractive force acting on the movable core increases compared to the case where the movable core is only attracted by the fixed core. As a result, the movable core and the movable contact connected thereto can be moved smoothly as the control power is applied.

[0067] In addition, when the same magnitude of control power is applied, the attractive force acting on the movable core by the magnetic force reinforcing member also increases.

[0068] Therefore, even if the magnitude of the control power supply for moving the movable core is reduced, the movable core can move smoothly, and the amount of electricity required to drive the DC relay can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 (a) and (b) are a top view and a cross-sectional view respectively showing the structure of a DC relay in the related art.

[0070] Figure 2 (a) and (b) are a plan view and a cross-sectional view, respectively, showing the direction of formation of a magnetic field and the direction of movement of an arc based thereon when current is applied to a conventional DC relay.

[0071] Figure 3 1 is a cross-sectional view showing a magnetic circuit formed inside a conventional DC relay.

[0072] Figure 4 It is a perspective view of a DC relay according to an embodiment of the present invention.

[0073] Figure 5 yes Figure 4 Cross-sectional view of a DC relay.

[0074] Figure 6 is set at Figure 4 A three-dimensional diagram of the magnetic strengthening component of a DC relay.

[0075] Figure 7 It is shown that the Figure 4 A three-dimensional diagram of a state in which a magnetic reinforcement member of a DC relay is coupled to a shaft.

[0076] Figure 8 yes Figure 4 A top view of a DC relay in a state where the upper frame is opened, (a) and (b) respectively show a case where the S pole is formed on the upper side of the magnetic force strengthening member and a case where the N pole is formed on the lower side of the magnetic force strengthening member.

[0077] Fig. 9 It shows that the current flows Figure 4 A cross-sectional view of the state of a DC relay.

[0078] Fig.10(a) and (b) show that when the S pole is formed on the upper side of the magnetic force strengthening member, as the current is Fig. 9 A top view and a cross-sectional view showing the direction of the magnetic circuit generated by the flow as shown in (a).

[0079] Fig.11 (a) and (b) show that when the S pole is formed on the upper side of the magnetic force strengthening member, as the current is Fig. 9 A top view and a cross-sectional view showing the direction of the magnetic circuit generated by the flow as shown in (b).

[0080] Fig.12 (a) and (b) show that when the N pole is formed on the upper side of the magnetic force strengthening member, as the current is Fig. 9 A top view and a cross-sectional view showing the direction of the magnetic circuit generated by the flow as shown in (a).

[0081] Fig.13 (a) and (b) show that when the N pole is formed on the upper side of the magnetic force strengthening member, as the current is Fig. 9 A top view and a cross-sectional view showing the direction of the magnetic circuit generated by the flow as shown in (b).

[0082] Fig.14 is shown in Figure 4 A top view of the magnetic circuit formed by the magnetic reinforcement member in the core of the lower side of the DC relay. DETAILED DESCRIPTION

[0083] Hereinafter, a DC relay 10 according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0084] In the following description, in order to make the features of the present invention more clear, the description of some components may be omitted.

[0085] 1. Definition of terms

[0086] When it is mentioned that a certain component is “connected to” or “contacting” another component, it should be understood that it can be directly connected to or contacting the other component, but other components may be present between them.

[0087] On the contrary, when it is mentioned that a certain component is “directly connected to” or “directly in contact with” another component, it should be understood that there are no other components between them.

[0088] An expression in the singular number used in this specification includes an expression in the plural number unless a different meaning is clearly indicated in the context.

[0089] The term "magnetize" used in the following description refers to a phenomenon in which a certain object acquires magnetism in a magnetic field.

[0090] The term "polarity" used in the following description refers to different properties of an anode and a cathode of an electrode, etc. In one embodiment, the polarity can be classified as an N pole or an S pole.

[0091] The terms "left side", "right side", "upper side", "lower side", "front side" and "rear side" used in the following description may be referred to by Figure 4 and Figure 5 The coordinate system shown in FIG.

[0092] 2. Description of the structure of the DC relay 10 according to the embodiment of the present invention

[0093] Reference Figure 4 and Figure 5 The DC relay 10 according to the embodiment of the present invention includes a frame portion 100 , a switch portion 200 , a core portion 300 , and a movable contact portion 400 .

[0094] In addition, the DC relay 10 according to the embodiment of the present invention includes the magnetic force forming portion 500 which forms a path for extinguishing the generated arc and increases the driving force of the movable core 320 .

[0095] Below, refer to Figure 4 and Figure 5 The configuration of the DC relay 10 according to the embodiment of the present invention will be described, and the magnetic force forming portion 500 will be described separately.

[0096] (1) Description of the frame portion 100

[0097] The frame 100 forms the outer side of the DC relay 10. A predetermined space is formed inside the frame 100. Various devices for performing the function of switching the DC relay 10 on or off can be accommodated in the space. That is, the frame 100 functions as a housing.

[0098] The frame 100 may be formed of an insulating material such as synthetic resin to prevent the inside and outside of the frame 100 from being arbitrarily electrified.

[0099] The frame part 100 includes an upper frame 110 , a lower frame 120 , an insulating plate 130 , and a support plate 140 .

[0100] The upper frame 110 forms an upper side of the frame portion 100. The opening and closing portion 200 and the movable contact portion 400 may be accommodated in an inner space of the upper frame 110.

[0101] The upper frame 110 may be combined with the lower frame 120. An insulating plate 130 and a support plate 140 may be disposed between the upper frame 110 and the lower frame 120. The insulating plate 130 and the support plate 140 are configured to electrically and physically separate the inner spaces of the upper frame 110 and the lower frame 120.

[0102] The fixed contact 220 of the switch 200 is disposed on one side of the upper frame 110, the upper side in the illustrated embodiment. The fixed contact 220 is partially exposed on the upper side of the upper frame 110 so as to be electrically connected to an external power source or load.

[0103] The lower frame 120 forms a lower side of the frame part 100. The core part 300 may be accommodated in an inner space of the lower frame 120.

[0104] The lower frame 120 may be combined with the upper frame 110. An insulating plate 130 and a support plate 140 may be disposed between the lower frame 120 and the upper frame 110. The insulating plate 130 and the support plate 140 are configured to electrically and physically separate the inner spaces of the lower frame 120 and the upper frame 110.

[0105] 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 from the lower frame 120.

[0106] Thus, it is possible to prevent unintentional conduction of electricity between the opening and closing portion 200 and the movable contact portion 400 accommodated in the upper frame 110 and the core portion 300 accommodated in the lower frame 120 .

[0107] A through hole (not shown) is formed in the center of the insulating plate 130. The shaft 440 to which the movable contact part 400 is coupled passes through the through hole (not shown) so as to be movable in the up-down direction.

[0108] The insulation plate 130 may be supported by the support plate 140 .

[0109] The support plate 140 is located between the upper frame 110 and the lower frame 120. The support plate 140 is configured to physically separate the upper frame 110 and the lower frame 120.

[0110] In addition, the support plate 140 is located under the insulating plate 130 and is configured to support the insulating plate 130 .

[0111] The support plate 140 may be formed of a magnetic body, so that the support plate 140 may form a magnetic circuit together with the yoke 330 of the core 300 . The magnetic circuit may apply a driving force to move the movable core 320 of the core 300 toward the fixed core 310 .

[0112] A through hole (not shown) is formed at the center of the support plate 140. The shaft 440 is coupled to the through hole (not shown) so as to be movable in the up-down direction.

[0113] Therefore, when the movable core 320 moves in a direction toward the fixed core 310 or in a direction away from the fixed core 310 , the shaft 440 and the movable contact 430 connected to the shaft 440 can also move in the same direction.

[0114] (2) Description of the Opening and Closing Unit 200

[0115] The switch unit 200 is configured to allow or prevent current from flowing through the DC relay 10 according to the operation of the core 300. Specifically, the switch unit 200 can allow or prevent current from flowing by making the fixed contact 220 and the movable contact 430 contact or separate.

[0116] The opening and closing part 200 is accommodated inside the upper frame 110. The opening and closing part 200 may be electrically and physically separated from the core part 300 by the insulating plate 130 and the support plate 140.

[0117] The switch unit 200 includes an arc chamber 210, a fixed contact 220, and a sealing member 230. In addition, as described later, the switch unit 200 may accommodate a first magnet member 510 and a second magnet member 520 of the magnetic force forming unit 500.

[0118] The magnet members 510 and 520 may be configured to form a magnetic field inside the arc chamber 210 to control the shape and discharge path of the generated arc. This will be described in detail later.

[0119] The arc chamber 210 is configured to extinguish (extinguish) the arc generated as the fixed contact 220 and the movable contact 430 are spaced apart. Therefore, the arc chamber 210 may also be referred to as an "arc extinguishing unit".

[0120] The arc chamber 210 is configured to contain 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 completely contained inside the arc chamber 210. Therefore, the arc generated by the separation of the fixed contact 220 and the movable contact 430 cannot leak to the outside of the arc chamber 210 at will.

[0121] The arc chamber 210 may be filled with arc extinguishing gas, which is used to extinguish the generated arc and discharge the arc to the outside of the DC relay 10 through a predetermined path.

[0122] The arc chamber 210 may be formed of an insulating material. In addition, the arc chamber 210 may be formed of a material having high pressure resistance and high heat resistance. This is because the generated arc is a high temperature and high pressure electron flow. In one embodiment, the arc chamber 210 may be formed of a ceramic material.

[0123] A plurality of through holes (not shown) may be formed on the upper side of the arc chamber 210. A fixed contact 220 is connected through each of the through holes (not shown). In the illustrated embodiment, the fixed contact 220 is provided with two first fixed contacts 220a and second fixed contacts 220b. Thus, two through holes (not shown) may be formed on the upper side of the arc chamber 210.

[0124] If the fixed contact 220 is connected to the through hole (not shown), the through hole (not shown) is sealed. That is, the fixed contact 220 is connected to the through hole (not shown) in a sealed manner. Therefore, the generated arc cannot be discharged to the outside through the through hole (not shown).

[0125] The lower side of the arc chamber 210 may be open. The insulating plate 130 is in contact with the lower side of the arc chamber 210. In addition, the sealing member 230 is 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. Thus, the arc chamber 210 can be electrically and physically separated from the outer space of the upper frame 110.

[0126] In other words, the arc chamber 210 is sealed by the insulating plate 130 , the support plate 140 , the fixed contact 220 , the sealing member 230 , and the housing 410 of the movable contact part 400 .

[0127] The arc extinguished in the arc chamber 210 is discharged to the outside of the DC relay 10 through a predetermined path.

[0128] The fixed contact 220 is configured to be in contact with or spaced apart from the movable contact 430 to connect or disconnect the conduction between the inside and the outside of the DC relay 10 .

[0129] Specifically, if the fixed contact 220 is in contact with the movable contact 430, the DC relay 10 can be energized inside and outside. On the contrary, if the fixed contact 220 is separated from the movable contact 430, the DC relay 10 is disconnected from the inside and outside.

[0130] As the name suggests, the fixed contact 220 does not move. That is, the fixed contact 220 is fixedly coupled to the upper frame 110 and the arc chamber 210. Therefore, contact and separation between the fixed contact 220 and the movable contact 430 are achieved by movement of the movable contact 430.

[0131] One end portion of the fixed contact 220, the upper end portion in the illustrated embodiment, is exposed to the outside of the upper frame 110. A power source or a load is electrically connected to the one end portion.

[0132] A plurality of fixed contacts 220 may be provided. In the illustrated embodiment, the fixed contacts 220 include a first fixed contact 220 a on the left and a second fixed contact 220 b on the right, and a total of two fixed contacts 220 are provided.

[0133] The first fixed contact 220a is located on one side, that is, on the left side in the illustrated embodiment, from the center in the longitudinal direction of the movable contact 430. The second fixed contact 220b is located on the other side, that is, on the right side in the illustrated embodiment, from the center in the longitudinal direction of the movable contact 430.

[0134] A power source may be electrically connected to any one of the first fixed contact 220a and the second fixed contact 220b. In addition, a load may be electrically connected to the other of the first fixed contact 220a and the second fixed contact 220b.

[0135] The DC relay 10 of the embodiment of the present invention can operate regardless of the polarity of the fixed contact 220. That is, the power supply or the load can be connected to any one of the first fixed contact 220a and the second fixed contact 220b in a manner that allows power to be supplied. This is caused by the direction of the magnetic field formed inside the arc chamber 210, and a detailed description of this will be given later.

[0136] The other end of the fixed contact 220, the lower end in the illustrated embodiment, extends toward the movable contact 430. If the movable contact 430 moves toward the fixed contact 220, the upper side in the illustrated embodiment, the lower end contacts the movable contact 430. Thus, the outside and the inside of the DC relay 10 can be energized.

[0137] The lower end of the fixed contact 220 is located inside the arc chamber 210 . That is, the lower end of the fixed contact 220 is also sealed by the arc chamber 210 .

[0138] When the control power is cut off, the movable contact 430 is separated from the fixed contact 220 by the elastic force of the return spring 360. At this time, as the fixed contact 220 and the movable contact 430 are separated, an arc is generated between the fixed contact 220 and the movable contact 430. The generated arc can be extinguished by the arc extinguishing gas inside the arc chamber 210 and discharged to the outside.

[0139] At this time, the path of the arc discharge may be changed according to the direction of the magnetic field formed inside the arc chamber 210 and the direction of the current applied through the fixed contact 220. This will be described in detail later.

[0140] The sealing member 230 is configured to block the communication between the arc chamber 210 and the internal space of the upper frame 110 . The sealing member 230 seals the lower side of the arc chamber 210 together with the insulating plate 130 and the support plate 140 .

[0141] Specifically, the upper side of the sealing member 230 is coupled to the lower side of the arc chamber 210 . In addition, the radial inner side of the sealing member 230 is coupled to the outer periphery of the insulating plate 130 , and the lower side of the sealing member 230 is coupled to the support plate 140 .

[0142] Thus, the arc generated in the arc chamber 210 and the arc extinguished by the arc extinguishing gas do not flow into the internal space of the upper frame 110 .

[0143] In addition, the sealing member 230 may be configured to block the communication between the internal space of the cylinder 370 and the internal space of the frame portion 100 .

[0144] (3) Description of Core 300

[0145] The core 300 is configured to move the movable contact part 400 upward as the control power is applied. In addition, when the application of the control power is released, the core 300 is configured to move the movable contact part 400 downward again.

[0146] The core 300 may be electrically connected to the outside of the DC relay 10. The core 300 may receive control power from the outside through the connection.

[0147] The core 300 is located at the lower side of the opening and closing part 200. In addition, the core 300 is accommodated inside the lower frame 120. The core 300 and the opening and closing part 200 may be electrically and physically separated from each other by the insulating plate 130 and the support plate 140.

[0148] The movable contact part 400 is located between the core part 300 and the switch part 200. The movable contact part 400 can move under the driving force applied by the core part 300. As a result, the movable contact 430 and the fixed contact 220 come into contact, so that the DC relay 10 can be energized.

[0149] The core portion 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 .

[0150] The fixed core 310 is magnetized by the electromagnetic force generated by the coil 350 to generate an electromagnetic attraction force. Under the attraction force generated by the fixed core 310, the movable core 320 moves toward the fixed core 310 (in the upper direction in the illustrated embodiment).

[0151] 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 .

[0152] The fixed core 310 may be configured as any member that can be magnetized by electromagnetic force. In one embodiment, the fixed core 310 may be configured as a permanent magnet or an electromagnet.

[0153] A portion of the stationary core 310 is accommodated in the upper space inside the cylinder 370. In addition, the outer periphery of the stationary core 310 is configured to be in contact with the inner periphery of the cylinder 370.

[0154] The fixed core 310 is located between the support plate 140 and the movable core 320 .

[0155] A through hole (not shown) is formed in the center of the fixed core 310. The shaft 440 is coupled to the through hole (not shown) so as to be movable up and down.

[0156] The fixed core 310 is located at a predetermined distance from the movable core 320. Therefore, the distance that the movable core 320 can move toward the fixed core 310 can be limited to the distance that the fixed core 310 is separated from the movable core 320. Thus, the predetermined distance can be defined as the "movement distance of the movable core 320".

[0157] A recessed portion 311 is formed in the center of the fixed core 310 by a predetermined distance. Specifically, the recessed portion 311 is formed by being recessed by a predetermined distance from a side surface of the fixed core 310 facing the support plate 140 .

[0158] The magnetic force strengthening member 530 of the magnetic force forming unit 500 is accommodated in the recessed portion 311. Therefore, the recessed distance and shape of the recessed portion 311 are preferably determined according to the height and shape of the magnetic force strengthening member 530.

[0159] The recessed portion 311 may be formed to extend radially outward from a through hole (not shown) formed at the center of the fixed core 310. In addition, the recessed portion 311 may be formed to have the same central axis as the through hole (not shown).

[0160] One end of the return spring 360, the upper end in the illustrated embodiment, contacts the lower side of the fixed core 310. When the fixed core 310 is magnetized to move the movable core 320 upward, the return spring 360 is compressed and stores a restoring force.

[0161] Thereby, when the magnetization of the fixed core 310 is finished, the movable core 320 can be returned to the lower side again.

[0162] The movable core 320 is configured to move toward the fixed core 310 due to the electromagnetic attraction force generated by the fixed core 310 when a control power source is applied.

[0163] As the movable core 320 moves, the shaft 440 coupled to the movable core 320 moves toward the fixed core 310, that is, upward in the illustrated embodiment. Also, as the shaft 440 moves, the movable contact part 400 coupled to the shaft 440 moves upward.

[0164] As a result, the fixed contact 220 comes into contact with the movable contact 430 , so that the DC relay 10 can be energized with an external power source and load.

[0165] The movable core 320 may be configured in any form that can receive the attraction force generated by the electromagnetic force. In one embodiment, the movable core 320 may be formed of a magnetic material, or may be configured as a permanent magnet or an electromagnet.

[0166] The movable core 320 is accommodated in the cylinder 370. In addition, the movable core 320 can move in the cylinder 370 along the length direction of the cylinder 370.

[0167] Specifically, the movable core 320 can move in a direction toward the fixed core 310 (upper direction in the illustrated embodiment) and a direction away from the fixed core 310 (lower direction in the illustrated embodiment).

[0168] 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.

[0169] The movable core 320 is located at the lower side of the fixed core 310. The movable core 320 is spaced apart from the fixed core 310 by a predetermined distance. As described above, the predetermined distance may be defined as a moving distance of the movable core 320.

[0170] A predetermined space is formed inside the movable core 320. Specifically, the movable core 320 is formed to extend in the longitudinal direction, and a hollow portion extending in the longitudinal direction is formed inside the movable core 320 by being recessed by a predetermined distance.

[0171] The return spring 360 and a portion of the shaft 440 penetrating and coupled to the return spring 360 are accommodated in the hollow portion.

[0172] Specifically, a portion of a shaft main body portion 441 of the shaft 440 adjacent to the movable core 320 and a shaft tail portion 443 are accommodated in the hollow portion.

[0173] The yoke 330 forms a magnetic circuit when a control power is applied to the yoke 330. The magnetic circuit formed by the yoke 330 can be configured to adjust the direction of the electromagnetic field formed by the coil 350.

[0174] Thus, when the control power is applied, the coil 350 can form an electromagnetic field in the direction in which the movable core 320 moves toward the fixed core 310. The yoke 330 can be formed of a conductive material that can pass electricity.

[0175] The yoke 330 is accommodated inside the lower frame 120. The yoke 330 is configured to surround the coil 350. The coil 350 may be accommodated inside the yoke 330 in a manner spaced apart from the inner circumferential surface of the yoke 330 by a predetermined distance.

[0176] The yoke 330 also contains the bobbin 340 therein. That is, the yoke 330, the coil 350, and the bobbin 340 around which the coil 350 is wound are sequentially arranged in the radially inner direction from the outer periphery of the lower frame 120.

[0177] The upper side of the yoke 330 contacts the support plate 140. In addition, the outer circumference of the yoke 330 may contact the inner circumference of the lower frame 120, or may be located at a position spaced apart from the inner circumference of the lower frame 120 by a predetermined distance.

[0178] As described later, the DC relay 10 according to the embodiment of the present invention includes a magnetic force reinforcing member 530. The magnetic force reinforcing member 530 is configured to reinforce the magnetic circuit formed by the yoke 330. This will be described in detail later.

[0179] The coil 350 is wound around the bobbin 340 . The bobbin 340 is accommodated inside the yoke 330 .

[0180] The bobbin 340 may include: a flat plate-shaped upper portion and a lower portion; and a cylindrical column portion extending in the length direction and connecting the upper portion and the lower portion. That is, the bobbin 340 is in the shape of a bobbin.

[0181] The upper portion of the bobbin 340 contacts the lower side of the support plate 140. In addition, the lower portion of the bobbin 340 is supported by a protrusion formed to protrude from the lower side of the lower frame 120 toward the upper side.

[0182] The coil 350 is wound around the columnar portion of the bobbin 340. The thickness of the wound coil 350 may be configured to be the same as the diameter of the upper and lower portions of the bobbin 340.

[0183] A hollow portion extending in the longitudinal direction is formed through the columnar portion of the bobbin 340. The cylinder 370 can be housed in the hollow portion.

[0184] 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 .

[0185] The coil 350 generates an electromagnetic field when a control power is applied. Under the effect of the electromagnetic field generated by the coil 350 , the fixed core 310 is magnetized, so that an attractive force can be applied to the movable core 320 .

[0186] The coil 350 is wound around the bobbin 340 . Specifically, the coil 350 is wound around the columnar portion of the bobbin 340 and is stacked radially outward of the columnar portion. The coil 350 is accommodated inside the yoke 330 .

[0187] When the control power is applied, the coil 350 generates an electromagnetic field. At this time, the strength and direction of the electromagnetic field generated by the coil 350 can be controlled by the yoke 330. Under the effect of the electromagnetic field generated by the coil 350, the fixed core 310 is magnetized.

[0188] When the fixed core 310 is magnetized, the movable core 320 receives an electromagnetic force, that is, an attractive force, in the direction of the fixed core 310. As a result, the movable core 320 moves toward the fixed core 310, that is, toward the upper side in the illustrated embodiment.

[0189] When the control power is released after the movable core 320 moves toward the fixed core 310 , the return spring 360 provides a driving force that enables the movable core 320 to move in a direction away from the fixed core 310 .

[0190] The return spring 360 is compressed as the movable core 320 moves toward the fixed core 310 , and stores a restoring force.

[0191] At this time, the restoring force stored in the return spring 360 is preferably smaller than the attractive force exerted by the fixed core 310 when it is magnetized on the movable core 320. Thus, during the application of the control power supply, the movable core 320 can be prevented from returning to the original position under the action of the return spring 360.

[0192] As described later, the DC relay 10 according to the embodiment of the present invention includes the magnetic force reinforcing member 530 . The magnetic force reinforcing member 530 can apply electromagnetic force to the movable core 320 together with the fixed core 310 .

[0193] Therefore, in the embodiment, the restoring force stored in the return spring 360 is preferably greater than the attractive force applied by the magnetic strengthening component 530 to the movable core 320, and less than the sum of the attractive force applied by the fixed core 310 to the movable core 320 due to the magnetization and the attractive force applied by the magnetic strengthening component 530 to the movable core 320.

[0194] When the control power is released, the movable core 320 is subjected to only the restoring force caused by the return spring 360. Thus, the movable core 320 can move in a direction away from the fixed core 310 and return to the original position.

[0195] The return spring 360 may be configured in any form that is compressed as the movable core 320 moves and can store a restoring force. In one embodiment, the return spring 360 may be configured as a coil spring.

[0196] The shaft 440 is connected through the return spring 360. The shaft 440 can move in the up-down direction independently of the return spring 360 when connected to the return spring 360. That is, the shaft 440 plays a role of supporting the return spring 360.

[0197] The return spring 360 is accommodated in a hollow portion formed through the movable core 320. In addition, one end of the return spring 360 facing the fixed core 310 is supported by the lower side of the fixed core 310 in contact with the upper end in the illustrated embodiment.

[0198] Alternatively, one end portion of the return spring 360 facing the fixed core 310 , the upper end portion in the illustrated embodiment, may be in contact with and supported by the lower side surface of the magnetic force strengthening member 530 .

[0199] The cylinder 370 accommodates the fixed core 310, the movable core 320, and the return spring 360. Inside the cylinder 70, the movable core 320 can move in the upward and downward directions.

[0200] The cylinder 370 is located in the hollow portion formed in the column portion of the bobbin 340. The upper end portion of the cylinder 370 contacts the lower side of the support plate 140. In addition, the side of the cylinder 370 contacts the inner circumference of the column portion of the bobbin 340, and the upper opening of the cylinder 370 may be sealed by the fixed core 310. The lower side of the cylinder 370 may contact the inner circumference of the lower frame 120.

[0201] The cylinder 370 accommodates the shaft 440. In the cylinder 370, the shaft 440 can move upward or downward together with the movable core 320.

[0202] (4) Description of movable contact part 400

[0203] The movable contact part 400 includes a movable contact 430 and a structure for moving the movable contact 430. Through the movable contact part 400, the DC relay 10 can be energized with an external power source and a load.

[0204] The movable contact part 400 is accommodated in the frame part 100, specifically, in the internal space of the upper frame 110. Specifically, the movable contact part 400 is accommodated in the arc chamber 210 inside the upper frame 110.

[0205] The fixed contact 220 is located above the movable contact part 400. The movable contact part 400 is accommodated inside the arc chamber 210 so as to be movable in a direction toward and away from the fixed contact 220 (up and down directions in the illustrated embodiment).

[0206] The core 300 is located below the movable contact part 400. The movable contact part 400 is accommodated so as to be movable toward and away from the fixed contact 220 (up and down directions in the illustrated embodiment) as the movable core 320 moves.

[0207] The movable contact part 400 includes a movable contact 430 . The movable contact 430 is configured to come into contact with or be spaced apart from the fixed contact 220 as the movable core 320 of the core part 300 moves.

[0208] In the illustrated embodiment, the movable contact part 400 includes a housing 410 , a cover 420 , a movable contact 430 , a shaft 440 , and an elastic part 450 .

[0209] Although not shown, the movable contact part 400 may include a yoke (not shown) for preventing the movable contact 430 from being separated from the fixed contact 220 . The yoke (not shown) may be configured to offset the electromagnetic repulsive force generated between the fixed contact 220 and the movable contact 430 .

[0210] The housing 410 accommodates the movable contact 430 and the elastic portion 450 that elastically supports the movable contact 430 .

[0211] In the illustrated embodiment, one side and the other side opposite to the housing 410 are open, and the movable contact 430 may be inserted through the open portion.

[0212] In the illustrated embodiment, the housing 410 includes: a base forming a lower side surface; and side surfaces protruding from both side ends of the base toward the fixed contact 220. If the movable contact 430 is inserted, the side surfaces of the housing 410 are configured to surround the movable contact 430.

[0213] A cover 420 is provided on the upper side of the housing 410 . The cover 420 is configured to cover the upper side surface of the movable contact 430 accommodated in the housing 410 .

[0214] The housing 410 and the cover 420 are preferably formed of an insulating material to prevent accidental power-on. In one embodiment, the housing 410 and the cover 420 may be formed of a synthetic resin or the like.

[0215] The lower side of the housing 410 is connected to the shaft 440. If the movable core 320 connected to the shaft 440 moves upward or downward, the housing 410 can also move upward or downward.

[0216] The housing 410 and the cover 420 may be combined by any member. In one embodiment, the housing 410 and the cover 420 may be combined by a fastening member (not shown) such as a bolt and a nut.

[0217] Alternatively, the cover 420 may be interference-fitted to the housing 410. To this end, grooves (not shown) may be formed concavely at the upper ends of both sides of the housing 410, and a protrusion (not shown) may be formed on the cover 420 for being inserted and coupled to the groove (not shown).

[0218] The movable contact 430 contacts the fixed contact 220 as the control power is applied, so that the DC relay 10 is energized with the external power supply and load. In addition, if the control power is released, the movable contact 430 is separated from the fixed contact 220, so that the DC relay 10 is not energized with the external power supply and load.

[0219] The movable contact 430 is located adjacent to the fixed contact 220 .

[0220] The upper side of the movable contact 430 is covered by the cover 420. In one embodiment, the upper side of the movable contact 430 may be in contact with a side of the cover 420 facing the movable contact 430, that is, the lower side in the illustrated embodiment.

[0221] The lower side of the movable contact 430 is elastically supported by the elastic portion 450. The elastic portion 450 elastically supports the movable contact 430 in a state where it is compressed and restored to a certain extent, so as to prevent the movable contact 430 from moving downward at will.

[0222] Thus, when the elastic portion 450 applies an elastic force toward the cover 420 to the movable contact 430 , the movable contact 430 can stably maintain a contact state with the fixed contact 220 .

[0223] The movable contact 430 is formed to extend in the length direction, that is, in the left and right directions in the illustrated embodiment. That is, the length of the movable contact 430 is formed to be longer than the width.

[0224] Thus, when the movable contact 430 is accommodated in the inner space of the housing 410, both side ends of the movable contact 430 in the length direction are exposed to the outside of the housing 410. Contact protrusions 431 are formed protrudingly at the both side ends.

[0225] The contact protrusion 431 is a portion of the movable contact 430 that contacts the fixed contact 220. The contact protrusion 431 is formed to protrude by a predetermined distance from one side of the movable contact 430 that faces the fixed contact 220, that is, the upper side in the illustrated embodiment.

[0226] In the illustrated embodiment, the fixed contacts 220 include a first fixed contact 220 a on the left and a second fixed contact 220 b on the right. Thus, the contact protrusions 431 may be formed at the ends of the movable contacts 430 corresponding to the positions of the fixed contacts 220 .

[0227] By contacting the protruding portion 431 , the distance that the movable contact 430 needs to move in order to contact the fixed contact 220 can be reduced.

[0228] The other parts of the movable contact 430 except the contact projection 431 do not contact the fixed contact 220 . This is because the contact projection 431 is formed to project from the movable contact 430 , and thus the contact projection 431 is the part of the movable contact 430 closest to the fixed contact 220 .

[0229] The width of the movable contact 430 may be the same as the distance between each side of the housing 410. That is, if the movable contact 430 is accommodated in the housing 410, both side surfaces of the movable contact 430 in the width direction may contact the inner surface of each side of the housing 410.

[0230] Thus, the state in which the movable contact 430 is accommodated in the housing 410 can be stably maintained.

[0231] 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, and moves the movable contact 430 upward or downward when the movable core 320 moves upward or downward.

[0232] The shaft 440 is formed to extend in a longitudinal direction, that is, in a vertical direction in the illustrated embodiment.

[0233] The shaft 440 is coupled to the movable core 320. If 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.

[0234] The shaft 440 is coupled to the housing 410. If the shaft 440 moves in the up-down direction, the housing 410 can move in the up-down direction together with the shaft 440.

[0235] The shaft 440 is connected to the fixed core 310 and the magnetic force reinforcing member 530 in a manner that allows vertical movement. The shaft 440 is inserted and connected to the movable core 320. In addition, the return spring 360 is connected to the shaft 440 through the fixed core 310 and the magnetic force reinforcing member 530.

[0236] The shaft 440 includes a shaft body portion 441 , a shaft head portion 442 , and a shaft tail portion 443 .

[0237] The shaft body 441 forms a main body of the shaft 440. In the illustrated embodiment, the shaft body 441 has a cylindrical shape having a circular cross section and extending in the longitudinal direction.

[0238] The shaft head 442 is located at one end of the shaft body 441 that is coupled to the housing 410, that is, the upper end in the illustrated embodiment. The shaft head 442 is coupled to the housing 410. The shaft head 442 may be formed to have a larger diameter than the shaft body 441.

[0239] The shaft head 442 and the housing 410 may be formed as one piece. In one embodiment, the shaft head 442 and the housing 410 may be insert-molded.

[0240] The shaft tail portion 443 is located at one end of the shaft main body portion 441 inserted into the movable core 320, the lower end in the illustrated embodiment. The shaft tail portion 443 is coupled to the movable core 320. The shaft tail portion 443 may be formed to have a larger diameter than the shaft main body portion 441.

[0241] The shaft 440 and the housing 410 as well as the shaft 440 and the movable core 320 can be stably maintained in a combined state through the shaft head portion 442 and the shaft tail portion 443 .

[0242] The elastic portion 450 elastically supports the movable contact 430. When the movable contact 430 is in contact with the fixed contact 220, the movable contact 430 tends to separate from the fixed contact 220 due to the electromagnetic repulsive force.

[0243] At this time, the elastic portion 450 elastically supports the movable contact 430 to prevent the movable contact 430 from being arbitrarily separated from the fixed contact 220 .

[0244] The elastic part 450 is compressed or stretched to store the restoring force, and can be set in any form that can stretch or compress and provide the restoring force to other components. In one embodiment, the elastic part 450 can be set as a coil spring.

[0245] The end of the elastic part 450 facing the movable contact 430, the upper end in the illustrated embodiment, contacts the lower side of the movable contact 430. In addition, the other end of the elastic part 450 opposite to the one end, the lower end in the illustrated embodiment, contacts the upper side of the housing 410.

[0246] The elastic part 450 can elastically support the movable contact 430 while being compressed to a predetermined length and storing a restoring force. Thus, even if an electromagnetic repulsive force is generated between the movable contact 430 and the fixed contact 220 , the movable contact 430 and the fixed contact 220 are not separated by the elastic part 450 .

[0247] A protrusion (not shown) into which the elastic part 450 can be inserted can be formed protrudingly on the lower side of the movable contact 430 so that the elastic part 450 is stably coupled. Similarly, a protrusion (not shown) into which the elastic part 450 can be inserted can be formed protrudingly on the upper side of the housing 410.

[0248] 3. Description of the Magnetic Force Generating Unit 500 Provided in the DC Relay 10 of the Embodiment of the Present Invention

[0249] Again parameter Figure 5 The DC relay 10 according to the embodiment of the present invention includes a magnetic force forming unit 500 .

[0250] The magnetic force forming part 500 may form a magnetic field for forming a moving path of the arc generated inside the arc chamber 210. In addition, the magnetic force forming part 500 may increase a driving force for moving the movable core 320 toward the fixed core 310 as a control power source is applied.

[0251] Below, refer to Figures 5 to 9 , the magnetic force forming unit 500 provided in the DC relay 10 of the embodiment of the present invention will be described in detail.

[0252] In the illustrated embodiment, the magnetic force forming portion 500 includes a first magnet member 510 , a second magnet member 520 , and a magnetic force strengthening member 530 .

[0253] The first magnet member 510 forms a magnetic field that forms a path for extinguishing an arc generated inside the arc chamber 210 .

[0254] Specifically, after the fixed contact 220 and the movable contact 430 come into contact and current flows, if the fixed contact 220 and the movable contact 430 are separated from each other, an arc may be generated.

[0255] At this time, the first magnet member 510 forms a magnetic field inside the arc chamber 210. The magnetic field formed by the first magnet member 510 and the current generate an electromagnetic force that guides the arc. The direction of the electromagnetic force can be defined by Fleming's left hand rule.

[0256] In the illustrated embodiment, the first magnet member 510 is accommodated inside the upper frame 110. In addition, the first magnet member 510 is located on the left side outside the arc chamber 210. This is to prevent the first magnet member 510 from being damaged by the arc generated inside the arc chamber 210.

[0257] In addition, the first magnet member 510 is disposed to contact the left inner surface of the upper frame 110. The first magnet member 510 may be fixed to the inner surface of the upper frame 110. To this end, a fixing device (not shown) for fixing the first magnet member 510 may be provided.

[0258] In other words, the first magnet member 510 is located close to one end portion of the movable contact 430 in the longitudinal direction, that is, the left end portion in the illustrated embodiment.

[0259] The first magnet member 510 may be configured in any form capable of forming a magnetic field. In one embodiment, the first magnet member 510 may be configured as a permanent magnet.

[0260] The magnetic field formed by the first magnet member 510 may be enhanced by the second magnet member 520 and the magnetic force strengthening member 530 .

[0261] Further references Fig.10 The first magnet member 510 includes a first inner portion 511 and a first outer portion 512 .

[0262] The first inner portion 511 may be defined as a side of the first magnet member 510 facing the fixed contact 220. That is, if it is defined that the fixed contact 220 is located inside and the upper frame 110 is located outside, the first inner portion 511 is a portion of the first magnet member 510 facing inside.

[0263] A side surface of the first inner portion 511 closest to the fixed contact 220 may be defined as a first inner surface 511 a .

[0264] The first outer side portion 512 may be defined as a side of the first magnet member 510 facing the inner surface of the upper frame 110. In other words, the first outer side portion 512 may be defined as a side portion of the first magnet member 510 opposite to the first inner side portion 511.

[0265] A side surface of the first outer portion 512 closest to the inner surface of the upper frame 110 may be defined as a first outer surface 512 a .

[0266] The first inner portion 511 and the first outer portion 512 are configured to have different polarities. That is, when the first inner portion 511 is formed as an N pole, the first outer portion 512 can be formed as an S pole. Conversely, when the first inner portion 511 is formed as an S pole, the first outer portion 512 can be formed as an N pole.

[0267] The second magnet member 520 forms a magnetic field that forms a path for extinguishing an arc generated inside the arc chamber 210 .

[0268] Specifically, after the fixed contact 220 and the movable contact 430 come into contact and current flows, if the fixed contact 220 and the movable contact 430 are separated from each other, an arc may be generated.

[0269] At this time, the second magnet member 520 forms a magnetic field inside the arc chamber 210. The magnetic field formed by the second magnet member 520 and the current generate an electromagnetic force that guides the arc. The direction of the electromagnetic force can be defined by Fleming's left hand rule.

[0270] In the illustrated embodiment, the second magnet member 520 is accommodated inside the upper frame 110. In addition, the second magnet member 520 is located on the right side of the outer side of the arc chamber 210. This is to prevent the second magnet member 520 from being damaged by the arc generated inside the arc chamber 210.

[0271] In addition, the second magnet member 520 is disposed to contact the right inner surface of the upper frame 110. The second magnet member 520 may be fixed to the inner surface of the upper frame 110. To this end, a fixing device (not shown) for fixing the second magnet member 520 may be provided.

[0272] In other words, the second magnet member 520 is located close to one end portion of the movable contact 430 in the longitudinal direction, that is, the right end portion in the illustrated embodiment.

[0273] The second magnet member 520 may be configured in any form capable of forming a magnetic field. In one embodiment, the second magnet member 520 may be configured as a permanent magnet.

[0274] The magnetic field formed by the second magnet member 520 may be enhanced by the first magnet member 510 and the magnetic force strengthening member 530 .

[0275] Further references Fig.10 The second magnet member 520 includes a second inner portion 521 and a second outer portion 522 .

[0276] The second inner portion 521 may be defined as a side of the second magnet member 520 facing the fixed contact 220. That is, if it is defined that the fixed contact 220 is located inside and the upper frame 110 is located outside, the second inner portion 521 is a portion of the second magnet member 520 facing inside.

[0277] A side surface of the second inner portion 521 closest to the fixed contact 220 may be defined as a second inner surface 521 a .

[0278] The second outer side portion 522 may be defined as a side of the second magnet member 520 facing the inner surface of the upper frame 110. In other words, the second outer side portion 522 may be defined as a side portion of the second magnet member 520 opposite to the second inner side portion 521.

[0279] A side surface of the second outer portion 522 closest to the inner surface of the upper frame 110 may be defined as a second outer surface 522 a .

[0280] The second inner portion 521 and the second outer portion 522 are configured to have different polarities. That is, when the second inner portion 521 is formed as an N pole, the second outer portion 522 can be formed as an S pole. Conversely, when the second inner portion 521 is formed as an S pole, the second outer portion 522 can be formed as an N pole.

[0281] The first magnet member 510 and the second magnet member 520 are arranged to be separated from each other with the arc chamber 210 therebetween. The first inner portion 511 of the first magnet member 510 and the second inner portion 521 of the second magnet member 520 are arranged to face each other.

[0282] The first inner portion 511 of the first magnet member 510 is configured to have the same polarity as the second inner portion 521 of the second magnet member 520. Similarly, the first outer portion 512 of the first magnet member 510 is configured to have the same polarity as the second outer portion 522 of the second magnet member 520.

[0283] In addition, the first inner portion 511 of the first magnet member 510 and the second inner portion 521 of the second magnet member 520 may be configured to have a polarity different from the polarity of the first portion 531 of the magnetic force strengthening member 530 .

[0284] By the above configuration, the magnetic field emitted from the first magnet member 510 and the second magnet member 520 can be configured to be concentrated on the magnetic force reinforcing member 530. Conversely, the magnetic field emitted from the magnetic force reinforcing member 530 can be configured to be concentrated on the first magnet member 510 and the second magnet member 520. This will be described in detail later.

[0285] In the illustrated embodiment, the first magnet member 510 and the second magnet member 520 are rectangular parallelepiped shapes having a rectangular cross section and extending in the length direction, that is, the front-to-back direction in the illustrated embodiment. The shapes of the first magnet member 510 and the second magnet member 520 can be any shape that can form a magnetic field.

[0286] Although not shown, additional magnet members (not shown) may be provided to form a magnetic field inside the arc chamber 210. The additional magnet members (not shown) may be provided at the front and rear sides outside the arc chamber 210 to form a magnetic field.

[0287] The magnetic force reinforcing member 530 strengthens the magnetic field formed by the first magnet member 510 and the second magnet member 520. Thus, the current flowing through the fixed contact 220 and the movable contact 430 and the electromagnetic force formed by the magnetic field are strengthened, thereby effectively forming an arc extinguishing path.

[0288] In addition, the magnetic force reinforcing member 530 can control the direction of the magnetic field formed by the first magnet member 510 and the second magnet member 520. Thus, an external power source and load can be connected to the fixed contact 220 in a manner that allows for arbitrary energization without maintaining directivity.

[0289] That is, the power source may be electrically connected to any one of the first fixed contact 220 a and the second fixed contact 220 b , and the load may be electrically connected to the other one.

[0290] The magnetic force reinforcing member 530 strengthens the driving force for moving the movable core 320 generated by applying control power to the core 300. Thus, even when a small control power is applied, a driving force sufficient to move the movable core 320 can be ensured.

[0291] The magnetic force reinforcing member 530 may form a magnetic field inside the arc chamber 210. In addition, the magnetic force reinforcing member 530 may apply an electromagnetic attractive force to the movable core 320.

[0292] The magnetic force reinforcing member 530 is located at the lower side of the movable contact part 400. Specifically, the magnetic force reinforcing member 530 is located at a position spaced apart from the housing 410 at a predetermined distance at the lower side of the housing 410.

[0293] In other words, the magnetic force strengthening member 530 is located on the other side of the movable contact 430 opposite to the side close to the fixed contact 220 .

[0294] In addition, the magnetic force reinforcing member 530 may be located at the center in the length direction of the movable contact 430. As described above, the first fixed contact 220a and the second fixed contact 220b are located at positions offset from the center in the length direction of the movable contact 430. Therefore, it can also be said that the magnetic force reinforcing member 530 is located between the first fixed contact 220a and the second fixed contact 220b.

[0295] The magnetic reinforcement member 530 is inserted into the fixed core 310 . Specifically, the magnetic reinforcement member 530 is inserted into and seated in the recessed portion 311 of the fixed core 310 .

[0296] The shaft 440 is connected through the magnetic reinforcement member 530. The shaft 440 can move in the up-down direction while connected through the magnetic reinforcement member 530. At this time, the magnetic reinforcement member 530 can remain inserted into the fixed core 310 regardless of the movement of the shaft 440.

[0297] In the illustrated embodiment, the magnetic reinforcement member 530 is cylindrical and has a hollow portion 535 formed therein in the height direction. The magnetic reinforcement member 530 may be of any shape that can be combined with the fixed core 310 to enhance the magnetic field and increase the driving force as described above.

[0298] The magnetic force strengthening member 530 may be configured in any form that forms a magnetic field and can generate magnetic force. In one embodiment, the magnetic force strengthening member 530 may be configured as a permanent magnet.

[0299] The magnetic strengthening member 530 includes a first portion 531 , a second portion 532 , an outer peripheral surface 533 , an inner peripheral surface 534 , and a hollow portion 535 .

[0300] The first portion 531 forms an upper side of the magnetic force strengthening member 530 . The first portion 531 may be defined as a side of the magnetic force strengthening member 530 that faces the movable contact 430 .

[0301] The first portion 531 is configured to have a predetermined polarity. In one embodiment, the first portion 531 can be configured to have either a N-pole or a S-pole.

[0302] The second portion 532 is located at the lower side of the first portion 531. The second portion 532 forms the lower side of the magnetic strengthening member 530. The second portion 532 may be defined as a side of the magnetic strengthening member 530 that faces the fixed core 310 or the movable core 320.

[0303] The second portion 532 is configured to have a predetermined polarity. In one embodiment, the second portion 532 can be configured to have either a N-pole or a S-pole.

[0304] The first portion 531 and the second portion 532 may be configured to have opposite polarities. That is, when the first portion 531 has an N pole, the second portion 532 may have an S pole. Conversely, when the first portion 531 has an S pole, the second portion 532 may have an N pole.

[0305] The first portion 531 may be configured to have a polarity opposite to the first inner portion 511 of the first magnet member 510 and the second inner portion 521 of the second magnet member 520. In other words, the second portion 532 may be configured to have the same polarity as the first inner portion 511 and the second inner portion 521.

[0306] The outer peripheral surface 533 forms a side surface of the magnetic force strengthening member 530. In the illustrated embodiment, the magnetic force strengthening member 530 is cylindrical, and the outer peripheral surface 533 can be referred to as a side surface.

[0307] When the magnetic reinforcement member 530 is inserted into the recess 311 of the fixed core 310 , the outer peripheral surface 533 may contact the inner peripheral surface of the fixed core 310 surrounding the recess 311 . In addition, the outer peripheral surface 533 may contact the inner peripheral surface of the support plate 140 .

[0308] Thus, the magnetic reinforcement member 530 can be stably mounted on the fixed core 310 .

[0309] The inner circumferential surface 534 forms an inner side surface of the magnetic force strengthening member 530. A space surrounded by the inner circumferential surface 534 may be defined as a hollow portion 535.

[0310] The hollow portion 535 is a space formed to penetrate in the height direction inside the magnetic force reinforcing member 530. The shaft 440 is coupled to the hollow portion 535 so as to be movable in the up-down direction.

[0311] The hollow portion 535 may be defined as a space surrounded by the inner circumferential surface 534. The diameter of the hollow portion 535 may be formed to be slightly larger than the diameter of the shaft body portion 441 of the shaft 440.

[0312] Thus, the magnetic reinforcement member 530 can be kept fixed regardless of the vertical movement of the shaft 440 .

[0313] 4. Description of the process of forming the arc discharge path in the DC relay 10 of the embodiment of the present invention

[0314] The DC relay 10 according to the embodiment of the present invention generates an electromagnetic force for forming an arc discharge path by a magnetic field and a flow of current.

[0315] The current is applied by the contact between the fixed contact 220 and the movable contact 430 . In addition, the magnetic field is formed by the magnetic force forming part 500 .

[0316] Below, refer to Figures 8 to 13 , the process of forming the arc discharge path in the DC relay 10 of the embodiment of the present invention is described in detail.

[0317] In the following description, the first inner portion 511 of the first magnet member 510 , the second inner portion 521 of the second magnet member 520 , and the second portion 532 of the magnetic force reinforcing member 530 are configured to have the same magnetic properties.

[0318] In addition, the first outer portion 512 , the second outer portion 522 , and the first portion 531 are configured to have the same magnetic properties and magnetic properties opposite to the above-mentioned magnetic properties.

[0319] As described above, the first magnet member 510 and the second magnet member 520 are respectively located adjacent to the left inner surface and the right inner surface of the upper frame 110. In addition, the magnetic force reinforcing member 530 is located between the first magnet member 510 and the second magnet member 520.

[0320] The first and second fixed contacts 220a and 220b are located between the first and second magnet members 510 and 520. The magnetic force reinforcing member 530 is located between the first and second fixed contacts 220a and 220b and is the same distance from each of the fixed contacts 220a and 220b.

[0321] Likewise, the magnetic force strengthening member 530 may be located at a position spaced apart from the first magnet member 510 and the second magnet member 520 by the same distance.

[0322] In addition, the flow of electric current can be classified into two types.

[0323] That is, Fig. 9 As shown in (a), it is conceivable that current flows in through the second fixed contact 220b located on the right side, passes through the movable contact 430, and then flows out through the first fixed contact 220a located on the left side. Hereinafter, the above situation is referred to as the "first energization situation".

[0324] In addition, if Fig. 9 As shown in (b), it is conceivable that the current flows in through the first fixed contact 220a located on the left, passes through the movable contact 430, and then flows out through the second fixed contact 220b located on the right. Hereinafter, the above situation is referred to as the "second energization situation".

[0325] (1) When the first portion 531 of the magnetic force strengthening member 530 forms an S pole, the arc discharge path is formed. Description of the process

[0326] Below, refer to Figure 8 (a) Figures 9 to 11 , describing the process of forming an arc discharge path when the first portion 531 of the magnetic force strengthening member 530 forms an S pole.

[0327] Reference Figure 8 (a) shows an example in which an S pole is formed in the first portion 531 of the magnetic force strengthening member 530. Although not shown in the figure, an N pole is formed in the second portion 532 as described above.

[0328] Fig.10 The flow CP of the magnetic field formed in the first energization state and the direction F1 of the electromagnetic force generated thereby are shown.

[0329] In the illustrated embodiment, the first portion 531 is an S pole, and therefore, the first inner portion 511 and the second inner portion 521 have an N pole. Considering that the direction of the magnetic field is from the N pole to the S pole, the flow (CP) of the magnetic field is emitted from the first magnet member 510 and the second magnet member 520 and is concentrated on the magnetic force strengthening member 530 (refer to Fig.10 A first direction of the

[0330] In the first energization state, current (CP) flows in through the second fixed contact 220b. If Fleming's left-hand rule is applied near the second fixed contact 220b, an electromagnetic force is generated in the direction of F1 (upper side in the illustrated embodiment).

[0331] In addition, the current (CP) flows out through the first fixed contact 220a. If Fleming's left-hand rule is applied near the first fixed contact 220a, an electromagnetic force is generated in the direction of F1 (upper side in the illustrated embodiment).

[0332] Fig.11 The flow (CP) of the magnetic field formed in the second energization state and the direction F1 of the electromagnetic force generated thereby are shown.

[0333] In the illustrated embodiment, the first portion 531 is an S pole, and therefore, the first inner portion 511 and the second inner portion 521 have an N pole. Considering that the direction of the magnetic field is from the N pole to the S pole, the flow (CP) of the magnetic field is emitted from the first magnet member 510 and the second magnet member 520 and is concentrated on the magnetic force strengthening member 530 (refer to Fig.11 A first direction of the

[0334] In the first energization state, current (CP) flows in through the first fixed contact 220a. If Fleming's left-hand rule is applied near the first fixed contact 220a, an electromagnetic force is generated in the direction of F1 (lower side in the illustrated embodiment).

[0335] In addition, the current (CP) flows out through the second fixed contact 220b. If Fleming's left-hand rule is applied near the second fixed contact 220b, an electromagnetic force is generated in the direction of F1 (the lower side in the illustrated embodiment).

[0336] That is, the electromagnetic forces formed at the first fixed contact 220a and the second fixed contact 220b are directed in the same direction F1. Thus, compared with the case where the electromagnetic forces formed at the fixed contacts 220a and 220b are directed in different directions, an arc extinguishing and discharge path can be effectively formed.

[0337] This is because the flow (CP) of the magnetic field emitted from the first magnet member 510 and the second magnet member 520 proceeds toward the magnetic force reinforcing member 530 located therebetween.

[0338] That is, the flow (CP) of the magnetic field emitted from the first magnet member 510 and the second magnet member 520 does not deviate to either side. Thus, even if the direction of the current at the first fixed contact 220a and the second fixed contact 220b is changed, the electromagnetic force acts in the same direction.

[0339] (2) When the first portion 531 of the magnetic force strengthening member 530 forms an N pole, the arc discharge path is formed. Description of the process

[0340] Below, refer to Figure 8 (b) Fig. 9 , Fig.12 as well as Fig.13 , describing the process of forming an arc discharge path when the first portion 531 of the magnetic force strengthening member 530 forms an N pole.

[0341] Reference Figure 8 (b) shows an example in which an N pole is formed in the first portion 531 of the magnetic force strengthening member 530. Although not shown in the figure, an S pole is formed in the second portion 532 as described above.

[0342] Fig.12 The flow (CP) of the magnetic field formed in the first energization state and the direction F2 of the electromagnetic force generated thereby are shown.

[0343] In the illustrated embodiment, the first portion 531 is an N pole, and therefore, the first inner portion 511 and the second inner portion 521 have an S pole. Considering that the direction of the magnetic field is from the N pole toward the S pole, the flow (CP) of the magnetic field is emitted from the magnetic force strengthening member 530 and is concentrated toward the first magnet member 510 and the second magnet member 520, respectively (refer to Fig.12 The second direction B).

[0344] In the first energization state, the current CP flows in through the second fixed contact 220b. If Fleming's left-hand rule is applied near the second fixed contact 220b, an electromagnetic force is generated in the direction of F2 (the lower side in the illustrated embodiment).

[0345] In addition, the current (CP) flows out through the first fixed contact 220a. If Fleming's left-hand rule is applied near the first fixed contact 220a, an electromagnetic force is generated in the direction of F2 (the lower side in the illustrated embodiment).

[0346] Fig.13 The flow (CP) of the magnetic field formed in the second energization condition and the direction F2 of the electromagnetic force generated thereby are shown.

[0347] In the illustrated embodiment, the first portion 531 is an N pole, and therefore, the first inner portion 511 and the second inner portion 521 have an S pole. Considering that the direction of the magnetic field is from the N pole toward the S pole, the flow (CP) of the magnetic field is emitted from the magnetic force strengthening member 530 and is concentrated toward the first magnet member 510 and the second magnet member 520, respectively (refer to Fig.13 The second direction B).

[0348] In the second energization state, current (CP) flows in through the first fixed contact 220a. If Fleming's left-hand rule is applied near the first fixed contact 220a, an electromagnetic force is generated in the direction of F2 (upper side in the illustrated embodiment).

[0349] In addition, the current (CP) flows out through the second fixed contact 220b. If Fleming's left-hand rule is applied near the second fixed contact 220b, an electromagnetic force is generated in the direction of F2 (upper side in the illustrated embodiment).

[0350] That is, the electromagnetic forces formed at the first fixed contact 220a and the second fixed contact 220b are directed in the same direction F2. Thus, compared with the case where the electromagnetic forces formed at the fixed contacts 220a and 220b are directed in different directions, an arc extinguishing and discharge path can be effectively formed.

[0351] This is because the flow (CP) of the magnetic field emitted from the magnetic force reinforcing member 530 proceeds toward the first magnet member 510 and the second magnet member 520 .

[0352] That is, the flow (CP) of the magnetic field emitted from the first magnet member 510 and the second magnet member 520 does not deviate to either side. Thus, even if the direction of the current at the first fixed contact 220a and the second fixed contact 220b is changed, the electromagnetic force acts in the same direction.

[0353] 5. Description of a process of increasing the driving force of the movable core 320 in the DC relay 10 of the embodiment of the present invention

[0354] The DC relay 10 of the embodiment of the present invention can generate a driving force for moving the movable core 320 toward the fixed core 310. The driving force can be generated by magnetizing the fixed core 310 by a magnetic field formed by the coil 350 as the control power is applied.

[0355] In addition, the DC relay 10 of the embodiment of the present invention includes the magnetic force reinforcing member 530. The magnetic force reinforcing member 530 can enhance the driving force for moving the movable core 320 toward the fixed core 310.

[0356] Below, refer to Fig.14 A process of increasing the driving force of the movable core 320 in the DC relay 10 according to the embodiment of the present invention will be described in detail.

[0357] As described above, the core 300 may be electrically connected to an external power source (not shown) to receive a control power source. When the control power source is applied, the coil 350 generates an electromagnetic field.

[0358] The fixed core 310 is magnetized by the electromagnetic field formed by the coil 350. The magnetized fixed core 310 applies an electromagnetic attraction force to the movable core 320 (see Fig.14 The movable core 320 is accommodated inside the cylinder 370 so as to be movable in the up-down direction.

[0359] Therefore, the movable core 320 moves upward toward the fixed core 310. At this time, as described above, the return spring 360 is compressed and stores a restoring force.

[0360] At this time, the magnetic reinforcement member 530 is located in the recessed portion 311 of the fixed core 310. The magnetic reinforcement member 530 is set as a permanent magnet that can form a magnetic field. That is, the magnetic reinforcement member 530 can also apply electromagnetic attraction to the movable core 320 (see Fig.14 dashed arrow).

[0361] Therefore, the movable core 320 receives electromagnetic attraction toward the fixed core 310 through the magnetized fixed core 310 and the magnetic reinforcement member 530. As a result, a larger electromagnetic attraction is applied to the movable core 320 than when the movable core 320 moves only by the electromagnetic attraction generated by the fixed core 310.

[0362] The electromagnetic attraction force applied by the magnetized fixed core 310 to the movable core 320 is proportional to the strength of the magnetic field formed by the coil 350. In addition, the strength of the magnetic field formed by the coil 350 is proportional to the magnitude of the control power applied from the outside, such as the magnitude of the current or voltage.

[0363] Therefore, it is possible to reduce the magnitude of the control power that needs to be applied to the coil 350 in order to apply the same electromagnetic attraction force to the movable core 320 .

[0364] 6. Description of the Effects of the DC Relay 10 of the Embodiment of the Present Invention

[0365] The magnetic force forming unit 500 of the embodiment of the present invention includes a first magnet member 510 and a second magnet member 520. In addition, a magnetic force reinforcing member 530 is located between the first magnet member 510 and the second magnet member 520.

[0366] The first inner portions 511 and the second inner portions 521 of the first and second magnet members 510 and 520 facing each other have the same polarity. The first portion 531 of the magnetic reinforcement member 530 has a different polarity from the first and second inner portions 511 and 521 .

[0367] Therefore, the flow (MP) of the magnetic field formed by the magnetic force forming part 500 may be formed in a direction from the first magnet member 510 and the second magnet member 520 toward the magnetic force reinforcing member 530, or may be formed in the opposite direction.

[0368] That is, the distance that the flow of the magnetic field (MP) moves inside the arc chamber 210 is reduced by the magnetic force reinforcing member 530. As a result, the flow of the magnetic field (MP) formed inside the DC relay 10 can be enhanced.

[0369] In addition, the magnetic reinforcement member 530 is connected to the shaft 440 through the shaft 440. The magnetic reinforcement member 530 may be inserted and connected to the recessed portion 311 formed concavely on the upper side of the fixed core 310.

[0370] Therefore, the magnetic force reinforcing member 530 can be provided without excessively changing the internal structure of the DC relay 10 .

[0371] In addition, the flow (MP) of the magnetic field formed by the first magnet member 510 and the second magnet member 520 may be strengthened by the magnetic force strengthening member 530 .

[0372] Therefore, a flow (MP) of a magnetic field of sufficient strength can be formed without increasing the volumes of the first magnet member 510 and the second magnet member 520 .

[0373] In addition, the flow of the magnetic field (MP) formed inside the arc chamber 210 is formed from the first magnet member 510 and the second magnet member 520 toward the magnetic force strengthening member 530. Alternatively, the flow of the magnetic field (MP) may be formed in a direction from the magnetic force strengthening member 530 toward the first magnet member 510 and the second magnet member 520.

[0374] Therefore, the flow (MP) of the magnetic field formed near each fixed contact 220a, 220b can be formed in different directions. As a result, the direction of extinguishing the arc can be easily changed according to the environment in which the DC relay 10 is installed. Thereby, the convenience of the user can be increased.

[0375] In addition, the flow of the magnetic field (MP) formed by the first magnet member 510 , the second magnet member 520 , and the magnetic force reinforcing member 530 forms an electromagnetic force in the same direction near each of the fixed contacts 220 a , 220 b .

[0376] Therefore, even if the direction of the current applied to each fixed contact 220a, 220b is changed, the arc generated at each fixed contact 220a, 220b is subjected to electromagnetic force in any direction of the front side and the rear side of the DC relay 10. Thus, the user does not need to connect the power supply and the load to the DC relay 10 according to the polarity, thereby increasing the convenience of the user.

[0377] When the coil 350 is energized and the fixed core 310 is magnetized, the fixed core 310 applies electromagnetic attraction to the movable core 320 . At this time, the magnetic force reinforcing member 530 is also configured to apply electromagnetic attraction to the movable core 320 .

[0378] Therefore, the driving force of the movable core 320 is increased compared to the case where only the electromagnetic attraction force generated by the fixed core 310 is applied to the movable core 320. Thus, the reliability of the operation of the DC relay 10 can be improved.

[0379] Furthermore, even if the magnitude of the control power applied to the coil 350 is reduced, the electromagnetic attraction corresponding to the reduced amount can be compensated by the magnetic force reinforcing member 530. Therefore, the magnitude of the control power for moving the movable core 320 can be reduced, thereby improving the power efficiency of the DC relay 10.

[0380] The above description has been made with reference to the preferred embodiments of the present invention, but it should be understood that a person skilled in the art may make various modifications and changes to the present invention without departing from the concept and scope of the present invention as described in the appended claims.

[0381] Description of Reference Numerals

[0382] 10: DC relay

[0383] 100: Framework

[0384] 110: Upper frame

[0385] 120: Lower frame

[0386] 130: Insulation board

[0387] 140: Support plate

[0388] 200: Opening and closing part

[0389] 210: Arc chamber

[0390] 220: Fixed contact

[0391] 220a: First fixed contact

[0392] 220b: Second fixed contact

[0393] 230: Sealing member

[0394] 300: Core

[0395] 310: Fixed core

[0396] 311: Depression

[0397] 320: Movable core

[0398] 330: Yoke

[0399] 340: Winding spool

[0400] 350: Coil

[0401] 360: Return spring

[0402] 370: Cylinder

[0403] 400: Movable contact

[0404] 410: Shell

[0405] 420: Cover

[0406] 430: Movable contact

[0407] 431: Contact protrusion

[0408] 440: Axis

[0409] 441: Shaft body

[0410] 442: Shaft head

[0411] 443: Tail

[0412] 450: Elastic part

[0413] 500: Magnetic force forming part

[0414] 510: First magnet member

[0415] 511: First inner part

[0416] 511a: first inner surface

[0417] 512: First outer side

[0418] 512a: first inner surface

[0419] 520: Second magnet member

[0420] 521: Second medial part

[0421] 521a: Second inner surface

[0422] 522: Second outer part

[0423] 522a: Second outer surface

[0424] 530: Magnetic reinforcement components

[0425] 531: Part 1

[0426] 532: Part 2

[0427] 533: Outer surface

[0428] 534: Inner Surface

[0429] 535: Hollow

[0430] 1000: DC relays of the prior art

[0431] 1100: Contact part of prior art

[0432] 1110: Fixed contacts of the prior art

[0433] 1120: Movable contact of prior art

[0434] 1130: Prior art return spring

[0435] 1200: Permanent magnets of the prior art

[0436] 1300: Core of the prior art

[0437] 1310: Fixed core of prior art

[0438] 1320: Movable core of prior art

[0439] 1321: Spring of the prior art

[0440] 1330: Prior art shaft

[0441] 1340: Prior art winding spool

[0442] 1350: Coil of the prior art

[0443] 1360: Prior art magnetic yoke

[0444] A: First direction

[0445] B: Second direction

[0446] F1: Direction of electromagnetic force in the first power-on condition

[0447] F2: The direction of the electromagnetic force in the second power-on condition

[0448] MP: Magnetic Path

[0449] CP: Current Path

Claims

1. A DC relay, wherein: include: Fixed contacts; A movable contact extending in a length direction, one side of which is located adjacent to the fixed contact so as to contact with or be separated from the fixed contact; A plurality of magnet components are respectively located near both side ends of the movable contact in the length direction to form a magnetic field; as well as The magnetic force strengthening member is located between the plurality of magnet members and forms a magnetic field together with the plurality of magnet members. The magnetic force strengthening member is located on the other side of the movable contact opposite to the one side of the movable contact, The plurality of magnet components include: A first magnet member is located near one end of the movable contact in the length direction; as well as The second magnet member is located near the other end of the movable contact in the longitudinal direction. The surfaces of the first magnet member and the second magnet member facing each other have the same polarity, A surface of the magnetic force reinforcing member facing the movable contact has a polarity different from a polarity of surfaces of the first magnet member and the second magnet member facing each other.

2. The DC relay according to claim 1, wherein: The fixed contact comprises: A first fixed contact is located at a position deviated to one side from the center in the length direction of the movable contact; and The second fixed contact is located at a position offset from the center in the longitudinal direction of the movable contact toward the other side opposite to the one side.

3. The DC relay according to claim 2, wherein: The magnetic force strengthening member is located between the first fixed contact and the second fixed contact in the longitudinal direction of the movable contact.

4. The DC relay according to claim 2, wherein: Either one of the first fixed contact and the second fixed contact is connected to an external power source in an electrically conductive manner. The other of the first fixed contact and the second fixed contact is electrically connected to an external load.

5. The DC relay according to claim 1, wherein: The direction of the magnetic field formed by the first magnet member, the second magnet member, and the magnetic force strengthening member is either a first direction or a second direction. The first direction is a direction from the first magnet member and the second magnet member toward the magnetic force strengthening member. The second direction is a direction from the magnetic force strengthening member toward the first magnet member and the second magnet member.

6. A DC relay, wherein: include: Fixed contacts; A movable contact, one side of which is in contact with the fixed contact or is separated from the fixed contact; a fixed core located on the other side of the movable contact opposite to the one side and magnetized when a control power source is applied; a movable core located on the other side of the fixed core opposite to the side of the fixed core close to the movable contact, and moving toward the fixed core when the control power is applied; as well as The magnetic force reinforcing member is located between the movable contact and the fixed core, and applies an attractive force toward the fixed core to the movable core.

7. The DC relay according to claim 6, wherein: comprising a coil arranged to surround the fixed core and the movable core and configured to form an electromagnetic field when the control power source is applied, The fixed core is magnetized by the electromagnetic field formed by the coil.

8. The DC relay according to claim 7, wherein: If the fixed core is magnetized, the fixed core applies an attractive force in the direction of the fixed core to the movable core. The magnetic force strengthening member applies an attractive force in a direction toward the magnetic force strengthening member to the movable core.

9. A DC relay, wherein: include: Fixed contacts; a movable contact, one side of which is located adjacent to the fixed contact so as to be in contact with or spaced apart from the fixed contact to allow or prevent energization; a shaft extending in a length direction and connected to the movable contact so as to move together with the movable contact in a direction toward the fixed contact or in a direction away from the fixed contact; a fixed core located near the other side of the movable contact opposite to the one side of the movable contact, the shaft being connected through the fixed core, and the fixed core being magnetized when a control power source is applied; a movable core located on the other side of the fixed core opposite to the side of the fixed core close to the movable contact, and moving toward the fixed core when a control power source is applied, the shaft being connected to the movable core; and The magnetic force strengthening member is located between the fixed core and the movable contactor, and the shaft is movably connected to the magnetic force strengthening member and is configured to apply an attractive force to the movable core.

10. The DC relay according to claim 9, wherein: The movable contact comprises a plurality of magnet members, each of which is located near both side ends in the length direction of the movable contact and is configured to form a magnetic field between the plurality of magnet members. The magnetic force strengthening member forms a magnetic field together with the plurality of magnet members.

11. The DC relay according to claim 10, wherein: The sides of the plurality of magnet members facing each other have the same polarity, The magnetic force reinforcing member has a polarity on a side facing the movable contactor that is different from a polarity on one side of each of the plurality of magnet members.

12. The DC relay according to claim 9, wherein: The magnetic force strengthening member has a cylindrical shape extending in the longitudinal direction. A hollow portion is provided at the center of the magnetic reinforcement member and is formed to penetrate in the longitudinal direction. The shaft is connected through the hollow portion.

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