CN115798999A

CN115798999A - DC relay

Info

Publication number: CN115798999A
Application number: CN202211687653.2A
Authority: CN
Inventors: 柳政雨
Original assignee: LSIS Co Ltd
Current assignee: LS Electric Co Ltd
Priority date: 2018-08-31
Filing date: 2019-08-29
Publication date: 2023-03-14
Also published as: CN210489542U; KR102537549B1; CN110875161A; CN110875161B; KR20200025808A

Abstract

The invention provides a direct current relay. The method comprises the following steps: a pair of fixed contacts; a movable assembly which moves up and down by an actuator to be brought into contact with or separated from a pair of fixed contacts, thereby energizing or interrupting an electric circuit, the movable assembly comprising: a movable member support frame connected to the actuator by a shaft; the movable piece support is fixed on the upper part of the movable piece support frame; the movable contact is arranged between the movable piece bracket and the movable piece supporting frame; an upper yoke and a lower yoke respectively disposed at an upper portion of the mover bracket and a lower portion of the movable contact to generate an electromagnetic force; a contact spring disposed between the lower yoke and the movable member support frame and pressing the lower yoke; the upper yoke is composed of a third flat plate part and a skirt part formed by extending downwards at two ends of the third flat plate part, and the upper yoke is combined with the movable support.

Description

DC relay

The application is a divisional application of the application with the Chinese patent application number of 201910807285.2, the application date of 2019, 08 and 29 months, and the invention name of the invention is 'direct current relay'.

Technical Field

The present invention relates to a Direct Current Relay (Direct Current Relay), and more particularly, to a Direct Current Relay having a movable member with an improved contact pressure.

Background

In general, a Direct Current Relay (Direct Current Relay) or a Magnetic Switch (Magnetic Switch) is a circuit switching device that transmits mechanical driving and Current signals using the principle of an electromagnet, and is provided in various industrial facilities, machines, vehicles, and the like.

In particular, an Electric Vehicle (Electric Vehicle) such as a hybrid Vehicle, a fuel cell Vehicle, a golf cart, and an Electric forklift includes therein an Electric Vehicle Relay (Electric Vehicle Relay) for supplying and cutting off battery power to a power generation device and an Electric component, which is one of key core components of the Electric Vehicle.

Fig. 1 shows an internal structural view of a related art dc relay.

The direct current relay includes:

casings

1, 2 each composed of an upper frame 1 and a lower frame 2; an intermediate plate 9 disposed inside the housing; contact portions 3 and 4 and an arc extinguishing portion 8 provided on an upper portion of the intermediate plate 9; and an actuator 7 provided at a lower portion of the intermediate plate 9. Here, the actuator 7 may be a device that operates using the principle of an electromagnet.

The fixed contacts 3 of the contact portions 3, 4 are exposed from the upper side of the upper frame 1 and connected to a load or a power source.

The upper frame 1 is provided with contact portions 3 and 4 and an arc extinguishing portion 8 inside. The contact portions 3 and 4 are composed of a fixed contact 3 and a movable contact 4, the fixed contact 3 is fixedly provided on the upper frame 1, and the movable contact 4 is driven by an actuator 7 to be brought into contact with or separated from the fixed contact 3. The arc-extinguishing portion 8 is typically made of a ceramic material. The arc extinguishing unit 8 is also called an arc chamber (arc chamber). The inside of the arc extinguishing portion 8 may be filled with arc extinguishing gas to extinguish the arc.

A permanent magnet (not shown) may be provided to effectively control an Arc (Arc) generated when the contact portions 3, 4 are cut off (separated). Permanent magnets are provided around the contact portions to generate a magnetic field to control the arc of the rapid current, and a permanent magnet holder 6 is provided for fixing the permanent magnets.

The direct current relay includes: a contact portion and an arc extinguishing portion provided at an upper portion of the board 1 provided inside a housing (not shown), and an actuator provided at a lower portion of the board 1.

An actuator working on the principle of an electromagnet comprises: a fixed core 7a, a movable core 7b, a movable shaft 7c, and a return spring 7d. The cylinder 7e surrounds the fixed core 7a and the movable core 7b. The cylinder 7e and the arc extinguishing portion 8 form a sealed space.

A coil 7f is provided around the cylinder tube 7e, and if a control power is applied, an electromagnetic force is generated around the coil. The fixed core 7a is magnetized (magnetized) by the electromagnetic force generated by the coil 7f, and the movable core 7b is attracted by the magnetic force of the fixed core 7 a. Therefore, the movable shaft 7c coupled to the movable core 7b moves together with the movable contact 4 coupled to the upper portion of the movable shaft 7c, and the movable contact comes into contact with the fixed contact 3, thereby bringing the circuit into an energized state. The return spring 7d provides an elastic force to enable the movable core 7b to return to the initial position when the control power of the coil is cut off.

However, in the direct current relay according to the related art, an electromagnetic repulsive force is generated between the fixed contact and the movable contact, and thus there is a tendency to be separated from each other. In order to prevent such an accidental separation due to electromagnetic repulsion, the movable contact 4 is subjected to contact pressure by the contact pressure spring 5. That is, the distance between the fixed core 7a and the movable core 7b is set longer than the distance between the fixed contact 3 and the movable contact 4, so that the movable contact receives a contact pressure in accordance with an excess stroke (over travel) of the movable core. However, when the electromagnetic repulsion force generated is stronger than such a contact pressure, there is still a risk of separation of the contact portions.

Disclosure of Invention

Problems to be solved

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an electromagnetic contactor including a movable member having an improved contact pressure.

Means for solving the problems

A DC relay according to an embodiment of the present invention includes: a pair of fixed contacts; and a movable assembly which moves up and down by means of an actuator and comes into contact with or separates from the pair of fixed contacts, thereby energizing or interrupting an electric circuit, the movable assembly comprising: a movable member support frame connected to the actuator by a shaft; the movable piece support is fixed on the upper part of the movable piece support frame; the movable contact is arranged between the movable piece bracket and the movable piece supporting frame; an upper yoke and a lower yoke provided at upper and lower portions of the movable contact, respectively, to generate an electromagnetic force; and a contact pressure spring which is arranged between the lower yoke and the movable part support frame and presses the lower yoke, and the movable component further comprises: a first fastening member for coupling the upper yoke and the mover support, or a second fastening member for coupling the movable contact and the lower yoke.

Here, the upper yoke is disposed on an upper portion or a lower portion of the mover bracket.

In addition, first and second holes are formed in the upper yoke and the mover bracket, respectively, and the first fastening member can be fastened to the first and second holes.

Further, an installation groove into which a lower end portion of the first fastening member can be inserted is formed on an upper side surface of the movable contact.

In addition, the lower side surface of the movable piece support frame is convexly provided with an insertion part, and the insertion part is inserted into the central hole of the middle plate.

The movable element holder includes a second flat plate portion and side portions formed by bending downward at both ends of the second flat plate portion.

In addition, a third hole and a fourth hole are formed in the movable contact and the lower yoke, respectively, and the second fastening member is fastenable to the third hole and the fourth hole.

The lower yoke includes a third flat plate portion and wing portions formed by bending upward at both ends of the third flat plate portion.

Further, an insertion groove for fixing an upper end portion of the decompression spring is formed in a central portion of a lower side surface of the lower yoke.

Effects of the invention

According to the dc relay of the embodiment of the present invention, since the upper yoke and the lower yoke are provided at the movable contact to cancel the electromagnetic repulsive force, the contact portions are not unintentionally separated.

Drawings

Fig. 1 is an internal structural view of a dc relay according to the related art.

Fig. 2 is an internal structural view of a dc relay according to an embodiment of the present invention.

Fig. 3 is a side view of the movable assembly of fig. 2.

Fig. 4 is an exploded perspective view of the movable assembly of fig. 3.

Fig. 5 is a side view of a movable assembly applied to a dc relay according to another embodiment of the present invention.

Fig. 6 is an exploded perspective view of the movable assembly of fig. 5.

Wherein the reference numerals are as follows:

11. 12 frame 13 arc chamber

14 fixed contact 15 permanent magnet support

30. 130

movable assembly

31, 131 upper yoke

32. 132 second flat plate part 33 skirt part

34. 133

first hole

35, 135 lower yoke

36 is inserted into the fourth holes of 37 and 139

38. 138 first fastening member 40 hinge support

41. 141 first

flat plate

42, 142 arm

43. 143

spring support

44, 145 hinge bracket

45. 146 third

Flat portion

46, 147 side portion

46a first side 46b second side

47

holes

48, 149 second hole

50. 150 movable contact 51 mounting groove

52. 152

third bore

55, 155 contact pressure spring

57. 157

shaft

58, 158 junction

56. 156 second fastening member 60 actuator

61 yoke 62 spool

63 coil 65 fixed core

67 movable core 68 cylinder

69 return spring 70 intermediate plate

72 sealing member

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are described in detail for those skilled in the art to easily implement the present invention, but it is not intended that the technical spirit and scope of the present invention be limited thereto.

Fig. 2 is an internal structure view of a dc relay according to an embodiment of the present invention, and fig. 3 and 4 are a side view and an exploded perspective view of a movable assembly of fig. 2, respectively. The dc relay of the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to an embodiment of the present invention, a dc relay includes: a movable assembly 30 and a pair of fixed contacts 14, the movable assembly 30 moving up and down by an actuator 60 and contacting or separating with the pair of fixed contacts 14 to thereby energize or deenergize a circuit, the movable assembly 30 comprising: a movable member support bracket 40 connected to the actuator 60 by a shaft 57; a mover bracket 44 fixed to an upper portion of the mover support frame 40; a movable contact 50 provided between the mover holder 44 and the mover support frame 40; an upper yoke 31 and a lower yoke 35 respectively provided at upper and lower portions of the movable contact 50 to generate an electromagnetic force; and a contact spring 55 that is provided between the lower yoke 35 and the mover support frame 40 and presses the lower yoke 35. The movable assembly 30 further includes a first fastening member 38 for coupling the upper yoke 31 and the mover support 44, or a second fastening member 56 for coupling the movable contact 50 and the lower yoke 35.

The

frames

11 and 12 are formed as box-shaped housings which house the respective components and can protect and support the respective components. The

frames

11, 12 may be constituted by an upper frame 11 and a lower frame 12.

The arc chamber 13 (arc chamber) is formed in a box shape with an open lower side, and is provided inside the upper frame 11. The arc chamber 13 is made of a material having excellent insulation, pressure resistance, and heat resistance to extinguish an arc generated when the

contact portions

14, 50 are cut. For example, the arc chamber 13 may be made of a ceramic material. The arc chamber 13 is fixedly disposed on an upper portion of the intermediate plate 70.

Fixed contacts 14 (fixed contacts) are provided in pairs and are fixedly provided in the arc chamber 13. The fixed contact 14 is exposed to the upper frame 11. Any one of the fixed contacts 14 may be connected to the power source side, and the other may be connected to the load side.

The movable contact 50 (moving contact) is formed of a plate-like body having a predetermined length and is provided at a lower portion of the pair of fixed contacts 14. The movable contact 50 is provided in the movable assembly 30 and moves integrally. The movable contact 50 may be linearly moved up and down by an actuator 60 provided inside the lower frame 12 to be brought into contact with or separated from the fixed contact 14, thereby connecting or disconnecting an electric circuit.

A permanent magnet (not shown) is provided to effectively control an Arc (Arc) generated when the

contact portions

14, 50 are cut off (separated). Permanent magnets are disposed about the

contact portions

14, 50 to generate a magnetic field to control the rapid current induced arcing. A permanent magnet holder 15 is provided to fix the permanent magnet.

An actuator 60 is provided to move the movable assembly 30, i.e., the movable contact 50. The actuator 60 may include: a yoke 61 formed in a "U" shape and forming a magnetic circuit (a magnetic circuit); a coil 63 wound on a bobbin 62 provided inside the yoke 61 and receiving an external power to generate a magnetic field; a fixed core 65 fixedly disposed inside the coil 63 and magnetized by a magnetic field generated by the coil 63 to thereby generate a magnetic attraction force; a movable core 67 provided at a lower portion of the fixed core 65 in a linearly movable manner and coming into contact with or separating from the fixed core 65 by a magnetic attractive force of the fixed core 65; a shaft 57 having a lower end coupled to the movable core 67 and an upper end slidably inserted through the movable contact 50; a return spring 69 provided between the fixed core 65 and the movable core 67 to return the movable core 67 downward; and a cylinder 68 accommodating the fixed core 65, the movable core 67, and a return spring 69.

An intermediate plate 70 is provided between the actuator 60 and the arc chamber 13. The intermediate plate 70 is disposed at an upper portion of the yoke 61 and is formed of a magnetic substance to form a magnetic path together with the yoke 61. The intermediate plate 70 also serves as a support plate to make it possible to arrange the arc chambers 13 in the upper portion and the actuators 60 in the lower portion, respectively. The lower portion of the intermediate plate 70 sealingly engages the cylinder 68.

A sealing member 72 may be provided between the intermediate plate 70 and the arc chamber 13. That is, the seal member 72 is provided along the lower circumference of the arc chamber 13 so as to seal the space formed by the arc chamber 13, the intermediate plate 70 (of the central portion of the intermediate plate), and the cylinder 68.

The movable assembly 30 includes a shaft 57, a mover support frame 40, a mover bracket 44, a movable contact 50, a contact pressure spring 55, an upper yoke 31, a lower yoke 35, a first fastening member 38 for coupling the upper yoke 31 and the mover bracket 44, and a second fastening member 56 for coupling the movable contact 50 and the lower yoke 35.

The shaft 57 is constituted by a rod or bar. The lower end of the shaft 57 is fixedly provided to the movable core 67. Therefore, the shaft 57 moves up and down together with the movement of the movable core 67, thereby bringing the movable contact 50 into contact with or separating it from the fixed contact 14.

The upper end of the shaft 57 is formed with a coupling portion 58. The coupling portion 58 may be formed in a plate shape, such as a circular plate. The engagement portion 58 of the shaft 57 is fixedly engaged to the inside of the movable member support bracket 40. The coupling portion 58 of the shaft 57 may be insert-coupled to the mover support frame 40, and may be manufactured by, for example, insert molding.

The mover support frame 40 is provided for fixing the setting shaft 57 and supporting the movable contact 50 and the like. The mover support frame 40 is composed of a first flat plate portion 41 and arm portions (arm) 42 formed to project upward at both side ends of the first flat plate portion 41.

A spring support portion 43 is formed to protrude from an upper portion of the first flat plate portion 41 of the mover support frame 40.

A mover bracket 44 is fixedly provided to the mover support bracket 40. Specifically, a side portion 46 of the mover bracket 44 is fixedly provided to the arm portion 42 of the mover support frame 40.

When viewed from the front (see fig. 2 and 4), the length (in the left-right direction) of the first flat plate portion 41 is formed smaller than the length (in the left-right direction) of the movable contact 50. Therefore, the contacts of the movable contact 50 are exposed to both sides of the mover support frame 40.

The width (in the front-rear direction) of the inner surface (upper surface) of the first flat plate portion 41 may be formed smaller than the width (in the front-rear direction) of the movable contact 50. Accordingly, the hinge bracket 44 can be stably inserted into the arm portion 42 coupled to the hinge support bracket 40 (refer to fig. 3).

The mover bracket 44 is provided to support the movable contact 50, the upper yoke 31, and the lower yoke 35.

The moveable member support 44 is fixedly disposed on the moveable member support bracket 40. The traveler bracket 44 is formed in the shape of "Contraband". That is, the mover bracket 44 has the second flat plate portion 45 and the two side portions 46. The two side portions 46 are formed by bending downward at both ends of the second flat plate portion 45.

The width (length in the left-right direction) of the second flat plate portion 45 is formed smaller than the length of the movable contact 50. Therefore, the contacts of the movable contact 50 are exposed to both sides of the mover bracket 44.

The second flat plate portion 45 is formed with a plurality of second holes 48 that can be coupled with the first fastening members 38.

The side portion 46 may be composed of a first side portion 46a and a second side portion 46b, the first side portion 46a being adjacent to the second flat plate portion 45 and extending downward, the second side portion 46b extending downward from the first side portion 46a.

The width (length in the left-right direction) of the first side portion 46a may be formed to be equal to the width of the second flat plate portion 45.

The width of the second side portion 46b is formed to be greater than the width of the first side portion 46a. That is, the width of the second flat plate portion 45 and the first side portion 46a is formed smaller than the width of the second side portion 46 b. In addition, the thickness of the moveable support 44 is formed to be less than the thickness of the moveable support bracket 40. Accordingly, the coupling force of the fixing of the mover bracket 44 to the mover support frame 40 can be maintained while reducing the weight.

The second side portion 46b is formed with a plurality of holes 47. Therefore, the coupling force can be improved at the time of insert molding.

The lower end of the second side portion 46b is bent inward. Therefore, the coupling force can be improved when the mover bracket 44 is insert-molded with the mover support frame 40.

The movable contact 50 is provided in contact with the lower side surface of the second flat plate portion 45. The movable contact 50 may not be fixed to the mover bracket 44 but may be separated from the mover bracket 44. Therefore, when the movable assembly 30 moves upward, the movable contact 50 separates from the second flat plate portion 45 and is brought into close contact with the fixed contact 14 by the contact pressure of the contact pressure spring 55.

A mounting groove 51 is formed in the center portion of the upper side surface of the movable contact 50. The lower end portion of the first fastening member 38 may be inserted into the mounting groove 51.

The movable contact 50 has a plurality of third holes 52 formed therein, into which the second fastening members 56 can be inserted around the mounting groove 51.

The lower yoke 35 is provided at a lower portion of the movable contact 50. The lower yoke 35 may be formed of a flat plate. The contact pressure spring 55 applies contact pressure to the movable contact 50 through the lower yoke 35. Therefore, the contact pressure spring 55 applies the contact pressure without damaging the movable contact 50, thereby improving the completeness.

A central portion of a lower side surface of the lower yoke 35 is formed with an insertion groove 36, and a pressing spring 55 can be fitted into the insertion groove 36. The upper end of the contact spring 55 is caught by the insertion groove 36 of the lower yoke 35 without being separated, thereby improving the operation stability.

The lower yoke 35 has a plurality of fourth holes 37 formed therein, into which the second fastening members 56 can be inserted around the insertion groove 36.

The upper yoke 31 is disposed on the upper portion of the mover bracket 44. The upper yoke 31 may be composed of a third flat plate 32 and a skirt 33 formed to extend downward at both ends of the third flat plate 32.

The upper yoke 31 is coupled to the mover bracket 44. For example, the upper yoke 31 may be clipped to the mover bracket 44. The upper yoke 31 can be sandwiched and joined to the second flat plate portion 45 and the first side portion 46a of the mover bracket 44.

The third flat plate part 32 of the upper yoke 31 is formed with a plurality of first holes 34, and the first fastening members 38 may be coupled to the first holes 34.

With the upper yoke 31 provided above the movable contact 50 and the lower yoke 35 provided below the movable contact 50, the upper yoke 31 and the lower yoke 35 are magnetized when the circuit is energized, and therefore the lower yoke 35 receives a force of attraction by the upper yoke 31. Therefore, the movable contact 50 receives an upward force to cancel the electromagnetic repulsive force.

The contact spring 55 is provided between the lower yoke 35 and the mover support frame 40. A contact pressure spring 55 is provided to support the lower yoke 35 and provide a contact pressure to the movable contact 50 through the lower yoke 35 when energized. The touch spring 55 may be formed of a compression coil spring.

The contact pressure spring 55 directly contacts the lower yoke 35 so as not to damage the movable contact 50. Therefore, the durability is increased.

A first fastening member 38 is provided to couple the upper yoke 31 and the mover bracket 44. The first fastening member 38 may be composed of a pin and a rivet, a bolt and a screw, and the like. The first fastening member 38 sandwiches the first hole 34 of the upper yoke 31 and the second hole 48 of the mover bracket 44. Therefore, the upper yoke 31 and the mover bracket 44 move up and down on the same axis without being disengaged in the lateral direction.

The lower end of the first fastening member 38 is inserted into the mounting groove 51 of the movable contact 50, thus providing an operation space and preventing the upper yoke 31 and the mover bracket 44 from being disengaged in the lateral direction.

A second fastening member 56 is provided to support the movable contact 50 and the lower yoke 35. The second fastening member 56 may be composed of a pin and rivet, a bolt and nut, and the like. The second fastening member 56 sandwiches the third hole 52 of the movable contact 50 and the fourth hole 37 of the lower yoke 35. Therefore, the movable contact 50 and the lower yoke 35 move up and down on the same axis without being separated in the lateral direction.

A movable assembly of a dc relay according to another embodiment of the present invention will be explained with reference to fig. 5 and 6.

A DC relay according to an embodiment of the present invention includes: a movable core 167 that moves up and down by an electromagnetic force; a shaft 157, a lower end of the shaft 157 being fixed to the movable core 167; a movable member support 140 fixed to an upper end of the shaft 157; a mover bracket 145 fixed to an upper portion of the mover support frame 140; a movable contact 150 disposed between the mover support 145 and the mover support 140; an upper yoke 131 provided between the mover bracket 145 and the movable contact 150; a lower yoke 135 provided at a lower portion of the movable contact 150; a contact spring 155 disposed between lower yoke 135 and mover support frame 140; and a first fastening member 138 for coupling the upper yoke 131 and the mover bracket 145.

The structures of the frame, the arc chamber, the fixed contacts, the actuator, etc., except for the movable assembly 130 may be applied the same as or similar to the foregoing embodiments, and thus detailed descriptions of the structural elements thereof will be omitted.

The movable contact 150 is formed of a plate-shaped body of a predetermined length and is provided at a lower portion of the pair of fixed contacts 114. The movable contact 150 is provided at the movable assembly 130 and integrally moves. The movable contact 150 may be linearly moved up and down by an actuator provided inside the lower frame to connect or disconnect a circuit by being brought into contact with or separated from the fixed contact.

The movable assembly 130 includes a shaft 157, a mover support 140, a mover bracket 145, a movable contact 150, a contact pressure spring 155, an upper yoke 131, a lower yoke 135, a first fastening member 138 for coupling the mover bracket 145 and the upper yoke 131, and a second fastening member 156 for coupling the movable contact 150 and the lower yoke 135.

The shaft 157 is constituted by a rod or bar. The lower end of the shaft 157 is fixedly provided to the movable core 167. Accordingly, the shaft 157 moves up and down along with the movement of the movable core 167, thereby bringing the movable contact 150 into contact with or separating the fixed contact 114 from each other.

The shaft 157 has a coupling portion 158 formed at an upper end thereof. The coupling portion 158 may be formed in a plate shape, such as a circular plate. Coupling portion 158 of shaft 157 is fixedly coupled to the interior of moveable member support bracket 140. Coupling portion 158 of shaft 157 may be insert coupled to moveable member support bracket 140, such as by insert molding.

The mover support 140 is provided for fixing the setting shaft 157 and supporting the movable contact 150 and the like. The mover support frame 140 is composed of a first flat plate portion 141 and arm portions (arm) 142 formed to protrude upward at both side ends of the first flat plate portion 141.

A spring support portion 143 is formed on the upper portion of the first flat plate portion 141 of the mover support frame 140.

The traveller support 145 is fixedly disposed on the arm portion 142 of the traveller support 140.

When viewed from the front (see fig. 6), the length (in the left-right direction) of the first flat plate portion 141 is formed smaller than the length (in the left-right direction) of the movable contact 150. Therefore, the contacts of the movable contact 150 are exposed to both sides of the mover support frame 140.

The width (in the front-rear direction) of the inner surface (upper surface) of the first flat plate portion 141 may be formed smaller than the width (in the front-rear direction) of the movable contact 150. Accordingly, the mover bracket 145 can be stably inserted into the arm portion 142 coupled to the mover support frame 140 (refer to fig. 5).

An insertion portion 144 is formed to protrude from a lower side surface of the mover support frame 140, and the insertion portion 144 is inserted into a central hole (not labeled) of an intermediate plate (not shown). The insertion portion 144 may be formed in a disk shape. The lower portion of the mover support frame 140 is formed with an insertion portion 144, and the insertion portion 44 is sandwiched and combined with the intermediate plate 170, thereby improving the stability of the mover 130.

The mover bracket 145 is provided to support the movable contact 150, the upper yoke 131, and the lower yoke 135.

A traveller support 145 is fixedly mounted to a traveller support 140. The traveler bracket 145 is formed in the shape of "Contraband". That is, the hinge bracket 145 has a second flat plate portion 146 and two side portions 147. The two side portions 147 are formed by bending downward at both ends of the second flat plate portion 146.

The width (length in the left-right direction) of the second flat plate portion 146 is formed smaller than the length of the movable contact 150. Therefore, the contacts of the movable contact 150 are exposed to both sides of the mover bracket 145.

The second flat plate portion 146 is formed with a plurality of second holes 149 that can be coupled with the first fastening members 138.

The side portion 147 is adjacent to the second flat plate portion 146 and extends downward. Side 147 is inserted into arm 142 coupled to hinge support 140.

The width (length in the left-right direction) of the side portion 147 may be formed to be equal to the width of the second flat plate portion 146.

The side portion 147 is formed with an aperture 148. Therefore, the coupling force can be improved at the time of insert molding.

The upper yoke 131 is disposed at a lower portion of the mover bracket 145. The upper yoke 131 may be formed of a flat plate. The width of the upper yoke 131 may be formed to be equal to the width of the mover bracket 145.

The lower side of the upper yoke 131 is formed with a coupling groove 132, and the lower yoke 135 may be coupled to the coupling groove 132. The coupling grooves 132 may be formed at the front and rear ends, respectively.

A first hole 133 is formed at a central portion of the upper yoke 131, and a first fastening member 138 may be inserted into the first hole 133.

The movable contact 150 is provided in contact with the lower side surface of the upper yoke 131. The upper yoke 131 and the movable contact 150 may not be fixed to the mover bracket 145 but may be separated from the mover bracket 145. Therefore, when the movable assembly 130 moves upward, the movable contact 150 is separated from the second flat plate portion 146 and is brought into close contact with the fixed contact 114 by the contact pressure of the contact pressure spring 155.

Support grooves 151 are formed at lower end portions of the front and rear side surfaces of the movable contact 150. The wing portions 137 of the lower yoke 135 are inserted into the supporting grooves 151.

The movable contact 150 has formed therein a plurality of third holes 152 into which the second fastening members 156 can be inserted at a central portion.

The movable contact 150 is surrounded by an upper yoke 131 at the upper portion and a lower yoke 135 at the lower portion.

The lower yoke 135 is provided at a lower portion of the movable contact 150. The lower yoke 135 may be composed of a third flat plate 136 and wing portions 137 bent upward at both ends of the third flat plate 136.

The contact pressure spring 155 applies a contact pressure to the movable contact 150 through the lower yoke 135. Therefore, the contact pressure spring 155 applies the contact pressure without damaging the movable contact 150, thereby improving safety.

The wing portions 137 of the lower yoke 135 are respectively clamped in the support groove 151 of the movable contact 150 and the coupling groove 132 of the upper yoke 131. Therefore, even if the upper yoke 131, the movable contact 150, and the lower yoke 135 are separated from the mover bracket 145, the coupling force therebetween can be maintained without being separated.

The lower yoke 135 is formed with a fourth hole 139 in the center portion into which the second fastening member 156 can be inserted.

When the circuit is energized, the upper yoke 131 and the lower yoke 135 are magnetized by the upper yoke 131 provided above the movable contact 150 and the lower yoke 135 provided below the movable contact 150, and thus the lower yoke 135 receives a force of being attracted by the upper yoke 131. Therefore, the movable contact 150 receives an upward force to cancel out the electromagnetic repulsion generated at the contact portions 114, 150.

Contact spring 155 is disposed between lower yoke 135 and moveable member support bracket 140. A contact pressure spring 155 is provided to support the movable contact 150 and provide a contact pressure to the movable contact 150 when energized. The touch pressure spring 155 may be formed of a compression coil spring.

The upper end of the contact pressure spring 155 is clamped to the lower end of the second fastening member 156 protruding from the lower side surface of the lower yoke 135, and the spring support portion 143 of the mover support frame 140 is clamped to the lower end of the contact pressure spring 155, thereby maintaining stability.

The contact pressure spring 155 directly contacts the lower yoke 135 so as not to damage the movable contact 150. Therefore, the durability is increased.

A first fastening member 138 is provided to support the traveller bracket 145 and upper yoke 131. The first fastening member 138 may be composed of a pin, a rivet, and the like. The first fastening member 138 is sandwiched between the second hole 149 of the mover bracket 145 and the first hole 133 of the upper yoke 131. Therefore, the upper yoke 131 and the mover bracket 145 move up and down on the same axis without being disengaged in the lateral direction.

The second fastening member 156 is provided to support the movable contact 150 and the lower yoke 135. The second fastening member 156 may be composed of a pin, a rivet, and the like. The second fastening member 156 is sandwiched between the third hole 152 of the movable contact 150 and the fourth hole 139 of the lower yoke 135. Therefore, the movable contact 150 and the lower yoke 135 move up and down on the same axis without being separated in the lateral direction.

The above-described embodiments are examples for implementing the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the essential characteristics of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical ideas of the present invention but to illustrate the present invention, and the scope of the technical ideas of the present invention is not limited by the embodiments. That is, the scope of protection of the present invention is construed by the appended claims, and all technical ideas within its equivalent scope should be construed as being included in the scope of the claims of the present invention.

Claims

1. A direct current relay comprising:

a pair of fixed contacts; and

a movable assembly which moves up and down by means of an actuator to contact or separate from a pair of the fixed contacts, thereby energizing or interrupting an electric circuit,

the direct-current relay is characterized in that,

the movable assembly includes:

a movable member support frame connected to the actuator by a shaft;

the movable piece support is fixed on the upper part of the movable piece support frame;

a movable contact provided between the movable piece support and the movable piece support frame;

an upper yoke and a lower yoke respectively disposed at an upper portion of the mover bracket and a lower portion of the movable contact to generate an electromagnetic force; and

a contact spring provided between the lower yoke and the movable member support frame for pressing the lower yoke,

the movable assembly further includes a first fastening member that couples the upper yoke and the movable body bracket or a second fastening member that couples the movable contact and the lower yoke,

the upper yoke is composed of a third flat plate portion and a skirt portion formed by extending downward at both ends of the third flat plate portion, and the upper yoke is coupled to the mover bracket.

2. The direct current relay according to claim 1,

a first hole is formed in the upper yoke, a second hole is formed in the movable member bracket, and the first fastening member is fastenable to the first hole and the second hole.

3. The direct current relay according to claim 1,

an installation groove into which a lower end portion of the first fastening member can be inserted is formed on an upper side surface of the movable contact.

4. The direct current relay according to claim 1,

and an insertion part is convexly formed on the lower side surface of the movable piece supporting frame and is inserted into the central hole of the middle plate.

5. The direct current relay according to claim 1,

the movable element holder includes a second flat plate portion and side portions formed by bending both ends of the second flat plate portion downward.

6. The direct current relay according to claim 1,

a third hole is formed in the movable contact, a fourth hole is formed in the lower yoke, and the second fastening member is fastenable to the third hole and the fourth hole.

7. The direct current relay according to claim 1,

the lower yoke includes a fourth flat plate portion and wing portions formed by bending upward at both ends of the fourth flat plate portion.

8. The direct current relay according to claim 1,

an insertion groove for fixing the upper end of the contact spring is formed in the center of the lower side of the lower yoke.