Electromagnetic contactor

Abstract

The present invention relates to a frame of an electromagnetic contact, and more particularly, to an electromagnetic contact having excellent bonding force of an arc tank and a frame. An electromagnetic contact according to an embodiment of the present invention is characterized by including a lower frame, an upper frame bonded to an upper portion of the lower frame, and an arc cover bonded to an upper portion of the upper frame, a first bonding portion capable of fastening a fastening member is protruded from one surface of the lower frame, a second bonding portion capable of fastening the fastening member and connected to the first bonding portion is protruded from one surface of the upper frame, a third bonding portion capable of fastening the fastening member and connected to the second bonding portion is protruded from one surface of the arc cover, and the fastening member is fastened by connecting the first bonding portion, the second bonding portion, and the third bonding portion.

Description

TECHNICAL FIELD

[0001] The present invention relates to a frame of an electromagnetic contactor, and more particularly, to an electromagnetic contactor having excellent coupling force of an arc box and a frame. BACKGROUND

[0002] Generally, an electromagnetic contactor is a circuit opening and closing device that transmits a mechanical drive and a current signal using the principle of an electromagnet, and is installed in various industrial devices, machines, vehicles, etc.

[0003] The electromagnetic contactor is composed of a fixed contact tip and a moving contact tip that open and close a circuit that supplies power to a load such as a motor, a coil and a core (fixed core and moving core) that constitute an electromagnet that performs an opening and closing operation of the moving contact tip, and a crossbar that is a connection mechanism that transmits movement of the electromagnet to the contact tip.

[0004] If a prescribed voltage is applied to the coil, an excitation current is generated, a magnetic flux is generated in the fixed core by the current, and the fixed core is magnetized, so that the moving core is attracted to the fixed core side. The moving contact and the moving contact tip are combined with the crossbar connected to the moving core, so that the moving contact and the moving contact tip move together with the movement of the moving core and close the circuit (closed state, power-on state) by contacting the fixed contact and the fixed contact tip fixed to the frame.

[0005] If the voltage applied to the coil is turned off, the excitation (magnetization) of the fixed core disappears, the moving core returns to the original position due to the return spring, so that the moving contact tip is separated from the fixed contact tip, and the circuit is opened (open state).

[0006] An arc occurs at the contact when the circuit is opened and closed, and the arc is extinguished by an arc box and a grid installed inside.

[0007] Figure 1 is a sectional view of a prior art electromagnetic contactor.

[0008] Generally, the electromagnetic contactor includes a housing (arc box) 9, a frame, a fixed contact 7, a moving contact 8, and an electric actuator that generally drives the moving contact 8 so that the opening and closing of the contact can be controlled by an electric signal.

[0009] The fixed contact 7 is connected to a power source or a load, and the movable contact 8 functions as a switch that makes contact with and separates from the fixed contact 7.

[0010] The frame is divided into a lower frame 1a and an upper frame 1b, and the fixed contact 7, the movable contact 8, and the electric actuator are accommodated in the inside of the frame.

[0011] The electric actuator is an electromagnet that generates an electric force by forming an electromagnetic field according to the connection of a power source, and includes a fixed core 2 and a movable core 5, a coil 3 and a bobbin 4, and a crossbar 6.

[0012] Here, a coil assembly in which the coil 3 and the bobbin 4 that fixes the coil are combined is inserted into the lower frame 1a. If an external power source is applied to the coil 3, an electric current flows in the coil 3, the fixed core 2 is excited to thereby attract the movable core 5. The lowering movement of the movable core 5 moves the crossbar 6 and the movable contact 8 together, and an electric circuit is energized as the movable contact 8 makes contact with the fixed contact 7.

[0013] Figure 2 An electromagnetic contactor of another embodiment in the related art is shown, Figure 3 A side sectional view of the electromagnetic contactor is shown.

[0014] A frame that houses and protects and fixes all the components of the electromagnetic contactor is roughly composed of a lower frame 1a, an upper frame 1b, and an arc box 1c.

[0015] In the past, in order to fix the above three components, the lower frame 1a and the upper frame 1b were fastened by a nut 12 and a screw 11, and the arc box 1c was fixed to the upper frame 1b by a fastening member 10 such as a rivet assembly.

[0016] However, since the fastening force of the fastening member 10 used at the time of assembling the arc box 1c is weak, there occurs a phenomenon that it is broken or disintegrated by a fault current at the time of a short circuit accident. SUMMARY

[0017] PROBLEMS TO BE SOLVED BY THE INVENTION

[0018] The present invention is proposed to solve the above problems, and aims to provide an electromagnetic contactor in which an arc box is not separated from a frame.

[0019] MEANS FOR SOLVING THE PROBLEMS

[0020] An electromagnetic contactor according to an embodiment of the present application includes a lower frame, an upper frame coupled to an upper portion of the lower frame, and an arc cover coupled to an upper portion of the upper frame. A first coupling portion capable of fastening a fastening member is formed on one side of the lower frame. A second coupling portion capable of fastening the fastening member and connected to the first coupling portion is formed on one side of the upper frame. A third coupling portion capable of fastening the fastening member and connected to the second coupling portion is formed on one side of the arc cover. The fastening member is fastened by connecting the first coupling portion, the second coupling portion, and the third coupling portion.

[0021] Here, the first coupling portion is formed at a prescribed length downward from an upper end portion of the lower frame. The length of the first coupling portion is less than the height of the lower frame.

[0022] In addition, the second coupling portion is formed from an upper end portion to a lower end portion of the upper frame.

[0023] In addition, the third coupling portion is formed at a prescribed length upward from a lower end portion of the arc cover. The length of the third coupling portion is less than the height of the arc cover.

[0024] In addition, a first fastening hole is formed in the first coupling portion to pass through in the up-down direction. The fastening member is coupled to the first fastening hole. A second fastening hole is formed in the second coupling portion to pass through in the up-down direction. The fastening member is coupled to the second fastening hole. A third fastening hole is formed in the third coupling portion to pass through in the up-down direction. The fastening member is coupled to the third fastening hole.

[0025] In addition, a first auxiliary fastening hole is formed in the first coupling portion adjacent to the first fastening hole. A second auxiliary fastening hole is formed in the second coupling portion adjacent to the second fastening hole. An auxiliary fastening member is provided to couple the first auxiliary fastening hole and the second auxiliary fastening hole.

[0026] In addition, the first coupling portion, the second coupling portion, and the third coupling portion are formed on both sides of one side of the lower frame, the upper frame, and the arc cover, respectively.

[0027] In addition, the first coupling portion, the second coupling portion, and the third coupling portion are formed on both sides of one side of the lower frame, the upper frame, and the arc cover, respectively.

[0028] In addition, the first coupling portion, the second coupling portion, and the third coupling portion are formed on a side of the upper frame on which a fixed contact does not protrude.

[0029] In addition, a top cover is provided that is connected to the upper part of the arc cover, a cover fastening hole is formed in the top cover, an interphase insulation groove is formed in the arc cover, and a cover fastening member is provided that connects the cover fastening hole and the interphase insulation groove and is fastened thereto.

[0030] The effects of the invention

[0031] According to an embodiment of the present invention, an electromagnetic contactor has a first joint, a second joint, and a third joint protruding from the upper frame, the lower frame, and the arc cover, and is provided with a fastening member that connects and fastens the first joint, the second joint, and the third joint, thereby enabling a stable connection force of the arc cover.

[0032] Furthermore, the assembly process is highly efficient because the fastening components used to connect the upper frame, lower frame, and arc cover are completed in one go.

[0033] In addition, auxiliary fastening components are added to fix the upper and lower frames, thereby improving the bonding strength between the upper and lower frames.

[0034] In addition, a cover fastening member is provided for the top cover installed on the upper part of the arc cover, thereby improving the bonding force.

[0035] Therefore, even if repeated arc extinguishing operations cause shocks, the arc cover will not separate. Attached Figure Description

[0036] Figure 1 It is a cross-sectional perspective view of an existing electromagnetic contactor.

[0037] Figure 2 and Figure 3 These are external perspective views and side sectional views of existing electromagnetic contactors.

[0038] Figures 4 to 6 This is a perspective view, an exploded perspective view, and a side view along direction A of the outer casing of an electromagnetic contactor according to an embodiment of the present invention.

[0039] Figure 7 yes Figure 4 A partial side view along direction B, part of which is a sectional view along line CC.

[0040] Figure 8 This is an exploded perspective view of the arc cover and top cover of an electromagnetic contactor according to an embodiment of the present invention. Detailed Implementation

[0041] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. This is intended to provide a detailed description sufficient to enable those skilled in the art to readily implement the invention, but it is not intended to limit the technical concept and scope of the invention.

[0042] Figures 4 to 6 is a perspective view, an exploded perspective view, and an A-direction side view of an outer case of an electromagnetic contactor according to an embodiment of the present application, Figure 7 is Figure 4 is a partial side view in a B-direction, and a part is a C-C line cross-sectional view.

[0043] The electromagnetic contactor according to each embodiment of the present application will be described in detail with reference to the accompanying drawings.

[0044] The electromagnetic contactor according to an embodiment of the present application is characterized by including a lower frame 20, an upper frame 30 combined with an upper portion of the lower frame 20, and an arc cover 40 combined with an upper portion of the upper frame 30, a first combining portion 22 in which a fastening member 70 is fastened is protruded from one side of the lower frame 20, a second combining portion 32 in which the fastening member 70 is fastened and connected to the first combining portion 22 is protruded from one side of the upper frame 30, a third combining portion 42 in which the fastening member 70 is fastened and connected to the second combining portion 32 is protruded from one side of the arc cover 40, and the fastening member 70 is fastened by being connected to the first combining portion 22, the second combining portion 32, and the third combining portion 42.

[0045] The frames 20, 30, and 40 can be referred to as an outer case, which is provided to accommodate and support constituent components of the electromagnetic contactor. The frames 20, 30, and 40 include the lower frame 20, the upper frame 30, and the arc cover 40.

[0046] The lower frame 20 is provided. The lower frame 20 is formed of an insulating material such as synthetic resin. The top surface of the lower frame 20 is open, and the inside of the lower frame 20 has an accommodation space.

[0047] The bottom surface of the lower frame 20 can be protruded by being formed with a flange 21. The bottom surface of the lower frame 20 is stably maintained with respect to the components built therein by being supported by the ground or an attached portion.

[0048] An auxiliary contact device 51 or the like accessory device can be provided at one side of the lower frame 20.

[0049] A coil assembly 55 is accommodated and provided in the inside of the lower frame 20. The coil assembly 55 can be provided in a coil assembly mounting case 53.

[0050] A fixed core 57 in an "E" shape is provided at the center portion and the peripheral portion of the coil assembly 55.

[0051] A first coupling portion 22 is formed on the lower frame 20 so as to protrude from one side surface. The first coupling portion 22 has a prescribed length (thickness) downward from the upper end portion of the lower frame 20. In other words, the first coupling portion 22 does not extend to the lower end portion of the lower frame 20. That is, the length (thickness) of the first coupling portion 22 is smaller than the length (height) of the lower frame 20.

[0052] A first fastening hole 23 is formed in the first coupling portion 22 so as to penetrate vertically (in the up-down direction). The fastening member 70 is coupled to the first fastening hole 23.

[0053] In addition, a first auxiliary fastening hole 24 is formed in the first coupling portion 22 so as to penetrate vertically. The first auxiliary fastening hole 24 is formed so as to be adjacent to the first fastening hole 23.

[0054] The first coupling portion 22 and the first fastening hole 23 can be formed on both side portions (both end portions) of one side surface of the lower frame 20. That is, a pair can be provided on one side surface. At this time, the first coupling portion 22 and the first fastening hole 23 formed on both side portions of one side surface can be symmetrical to each other.

[0055] The first coupling portion 22 and the first fastening hole 23 can be formed on symmetrical side portions (end portions) of the lower frame 20, respectively. At this time, the first coupling portion 22 and the first fastening hole 23 formed on both sides can be symmetrical to each other. That is, a pair of the first coupling portion 22 and the first fastening hole 23 can be formed on both side surfaces of the lower frame 20 in opposite directions, respectively.

[0056] A protruding portion 25 can be formed on one side surface of the lower frame 20 so as to protrude upward. The protruding portion 25 can be formed on the surface on which the first coupling portion 22 is formed. The protruding portion 25 can be formed on both side surfaces of the lower frame 20 in opposite directions, respectively.

[0057] An upper frame 30 is provided. The upper frame 30 is formed of an insulating material such as synthetic resin. The bottom surface of the upper frame 30 is open, and an accommodation space is formed in the inside of the upper frame 30.

[0058] A horizontal bar 61 is formed in the upper frame 30 so as to penetrate and be movable up and down. In the case of a plurality of phases, the horizontal bar is provided so as to protrude toward each phase. In the case of three phases, the horizontal bar 61 is formed in the shape of a trident so as to protrude toward each phase.

[0059] A movable iron core (not shown) is coupled to the lower portion of the horizontal bar 61. In the case where an external power source is applied to the coil assembly 55 to generate magnetic flux, the movable iron core is attracted by the fixed iron core 57 which is magnetized to move downward. At this time, since the movable iron core is coupled to the horizontal bar 61, the horizontal bar 61 is moved downward together with the movable iron core.

[0060] A fixed contact 65 is provided on the top surface of the upper frame 30. The fixed contact 65 is provided for each phase. The fixed contact 65 for each phase can be divided into a fixed contact provided on the power supply side and a fixed contact provided on the load side. A terminal portion is formed at the end portion of the fixed contact 65. That is, the fixed contact 65 can be formed in one piece with the terminal.

[0061] An inter-phase insulation wall 67 can be provided between the adjacent fixed contacts 65. The inter-phase insulation wall 67 prevents an arc generated at the terminal portion from spreading to the adjacent phase.

[0062] A second coupling portion 32 protruding from one side surface is formed in the upper frame 30. Here, the surface in which the second coupling portion 32 is formed is a surface on which the fixed contact 65 is not exposed. The second coupling portion 32 has a length (thickness, height) from the upper end portion to the lower end portion of the upper frame 30. In other words, the second coupling portion 32 is not formed only on a part of the upper frame 30 in the up-and-down length direction, but is formed from the upper end portion to the lower end portion. That is, the length (thickness) of the second coupling portion 32 is the same as the length (height) of the upper frame 30.

[0063] A second fastening hole 33 that penetrates vertically (in the up-and-down direction) is formed in the second coupling portion 32. A fastening member 70 is coupled to the second fastening hole 33.

[0064] A second auxiliary fastening hole 34 that penetrates vertically is formed in the second coupling portion 32. The second auxiliary fastening hole 34 is formed adjacent to the second fastening hole 33.

[0065] The second coupling portion 32 and the second fastening hole 33 can be formed on both side portions (both end portions) of one surface of the upper frame 30. That is, a pair can be provided on one surface. At this time, the second coupling portion 32 and the second fastening hole 33 formed on both side portions of one surface can be symmetrical to each other.

[0066] The second coupling portion 32 and the second fastening hole 33 can be formed on symmetrical side surfaces of the upper frame 30, respectively. At this time, the second coupling portion 32 and the second fastening hole 33 formed on both sides can be symmetrical to each other. That is, the second coupling portion 32 and the second fastening hole 33 can be formed on opposite side surfaces of the upper frame 30, respectively, in one pair.

[0067] The second coupling portion 32 and the second fastening hole 33 are formed to communicate with the first coupling portion 22 and the first fastening hole 23. That is, they are formed on the same side surface. The side surface can be a surface on which the fixed contact 65 is not exposed in the upper frame 30.

[0068] A recessed portion 35 corresponding to the protruding portion 25 of the lower frame 20 can be formed on one side surface of the upper frame 30. The recessed portion 35 can be formed on opposite side surfaces of the upper frame 30, respectively.

[0069] A plurality of insertion portions 37 are formed protruding on the top surface of the upper frame 30. Here, the insertion portions 37 can be formed on the upper portion of the surface on which the fixed contact 65 is not exposed. In the case where the arc cover 40 is coupled to the upper frame 30, the insertion portions 37 are inserted into the side surface portion of the arc cover 40.

[0070] The arc cover 40 is provided. The arc cover 40 is formed of an insulating material such as synthetic resin. The bottom surface of the arc cover 40 is open, and an accommodation space is formed in the inside of the arc cover 40.

[0071] The cross bar 61 and the movable contact are provided in the accommodation space of the arc cover 40 and act in the space.

[0072] The top surface of the arc cover 40 is formed with a trip key hole 41. The head portion of the cross bar 61 is exposed from the trip key hole 41, so that a trip operation can be performed.

[0073] The side surface of the arc cover 40 is formed with a plurality of exhaust holes 45.

[0074] The arc cover 40 is formed with a third coupling portion 42 protruding from one side surface. The third coupling portion 42 has a prescribed length (thickness) from the lower end portion of the arc cover 40. The third coupling portion 42 does not extend to the upper end portion of the arc cover 40. In other words, the third coupling portion 42 is formed only on a portion of the arc cover 40 in the up-and-down length direction, not along the entire length of the arc cover 40. That is, the length (thickness) of the third coupling portion 42 is smaller than the length (height) of the arc cover 40.

[0075] The third coupling portion 42 is formed with a third fastening hole 43 that penetrates vertically (in the up-and-down direction). The fastening member 70 is coupled to the third fastening hole 43.

[0076] The third coupling portion 42 and the third fastening hole 43 can be formed on both side portions (both end portions) of one surface of the arc cover 40. At this time, the third coupling portion 42 and the third fastening hole 43 formed on both side portions can be symmetrical to each other.

[0077] The third coupling portion 42 and the third fastening hole 43 can be formed on both symmetrical side surfaces of the arc cover 40, respectively. At this time, the third coupling portion 42 and the third fastening hole 43 formed on both sides can be symmetrical to each other. That is, the third coupling portion 42 and the third fastening hole 43 can be formed in a pair on both side surfaces of the arc cover 40 in opposite directions, respectively.

[0078] The third coupling portion 42 and the third fastening hole 43 are formed to communicate with the second coupling portion 32 and the second fastening hole 33. That is, formed on the same side surface.

[0079] A fastening member 70 such as a screw and a nut is provided. The fastening member 70 is coupled by penetrating the first fastening hole 23, the second fastening hole 33, and the third fastening hole 43. Thereby, the lower frame 20, the upper frame 30, and the arc cover 40 can be fastened by one operation. In addition, by coupling the arc cover 40 with the upper frame 30 and the lower frame 20 as one body, even if the arc frequently occurs, the arc cover 40 does not separate and maintains stable coupling.

[0080] In order to easily couple the fastening member 70, the screw member 72 can be an insert nut. The screw member 72 can be inserted into the first coupling portion 22 provided in the lower frame 20.

[0081] An auxiliary fastening member 75 such as a screw is provided. The auxiliary fastening member 75 is coupled by connecting the first auxiliary fastening hole 24 and the second auxiliary fastening hole 34. The upper frame 30 and the lower frame 20 are further coupled by the auxiliary fastening member 75, and thus the coupling force of the upper frame 30 and the lower frame 20 is further increased.

[0082] Figure 7 is a partial side view in the B direction of Figure 4 partially shows a C-C line cross-sectional view, Figure 8 shows a separated perspective view of the arc cover and the top cover.

[0083] A top cover 50 is provided. The top cover 50 is coupled with the top surface of the arc cover 40.

[0084] A key hole 58 communicating with the trip key hole 41 is formed in the top cover 50. A trip operation can be performed by the head of the cross bar 61 protruding from the key hole 58.

[0085] A cover fastening hole 59 is formed in the top cover 50. The position where the cover fastening hole 59 is formed can be a portion where phases meet each other.

[0086] An inter-phase insulation groove 46 is formed in the arc cover 40. The inter-phase insulation groove 46 and the cover fastening hole 59 are disposed to communicate with each other. The lower end portion of the inter-phase insulation groove 46 can be formed with a step.

[0087] A cover fastening member 77 is provided. The cover fastening member 77 is fastened by connecting the cover fastening hole 59 and the inter-phase insulation groove 46. By the cover fastening member 77, the top cover 50 is stably fastened to the arc cover 40. Here, the cover fastening member 77 can be a bolt, which can be fastened to a nut 79 disposed in the lower portion of the inter-phase insulation groove 46.

[0088] The above-described embodiments are the embodiments of implementing the present application, and those skilled in the art can make various modifications and variations without departing from the scope of the present application. Therefore, the disclosed embodiments of the present application are not intended to limit the technical ideas of the present application, but to illustrate the present application, and the scope of the technical ideas of the present application is not limited by such embodiments. That is, the scope of protection of the present application should be interpreted by the appended claims, and all technical ideas within the equivalent scope thereof should be interpreted as being included in the scope of protection of the present application.

Claims

1. An electromagnetic contactor, characterized by, Comprising: a lower frame; an upper frame combined with an upper portion of the lower frame; and an arc cover combined with an upper portion of the upper frame; a first combining portion capable of fastening a fastening member is formed on one side of the lower frame, a second combining portion capable of fastening the fastening member and connected to the first combining portion is formed on one side of the upper frame, a third combining portion capable of fastening the fastening member and connected to the second combining portion is formed on one side of the arc cover, the fastening member is fastened by connecting the first combining portion, the second combining portion, and the third combining portion, the first combining portion, the second combining portion, and the third combining portion are communicatively arranged, the first combining portion is formed from an upper end portion of the lower frame to a lower portion by a predetermined length, and the length of the first combining portion is smaller than the height of the lower frame, the second combining portion is formed from an upper end portion to a lower end portion of the upper frame, the third combining portion is formed from a lower end portion of the arc cover to an upper portion by a predetermined length, and the length of the third combining portion is smaller than the height of the arc cover, a first auxiliary fastening hole is formed in the first combining portion, a second auxiliary fastening hole is formed in the second combining portion, and an auxiliary fastening member that combines the first auxiliary fastening hole and the second auxiliary fastening hole is provided, a protruding portion protruding upward is formed on one side of the lower frame, and a recessed portion corresponding to the protruding portion is formed on one side of the upper frame, a plurality of insertion portions that are combined with a side portion of the arc cover are formed on a top surface of the upper frame.

2. The electromagnetic contactor according to claim 1, wherein a first fastening hole that penetrates in an up-down direction is formed in the first combining portion, and the fastening member is combined with the first fastening hole, a second fastening hole that penetrates in the up-down direction is formed in the second combining portion, and the fastening member is combined with the second fastening hole, a third fastening hole that penetrates in the up-down direction is formed in the third combining portion, and the fastening member is combined with the third fastening hole.

3. The electromagnetic contactor according to claim 2, wherein the first auxiliary fastening hole is formed in the first combining portion adjacent to the first fastening hole, the second auxiliary fastening hole is formed in the second combining portion adjacent to the second fastening hole.

4. The electromagnetic contactor according to claim 1, wherein the first combining portion, the second combining portion, and the third combining portion are respectively formed on both sides of one side of the lower frame, the upper frame, and the arc cover.

5. The electromagnetic contactor according to claim 4, wherein the first combining portion, the second combining portion, and the third combining portion are respectively formed on both sides of corresponding sides of the lower frame, the upper frame, and the arc cover.

6. The electromagnetic contactor according to claim 5, wherein the first combining portion, the second combining portion, and the third combining portion are formed on a side from which the fixed contact does not protrude, with reference to the upper frame. ​ 7. The electromagnetic contact according to claim 1, wherein a top cover is provided in combination with an upper portion of the arc cover, a cover fastening hole is formed in the top cover, a phase insulation groove is formed in the arc cover, a cover fastening member is provided which is fastened connecting the cover fastening hole and the phase insulation groove. ​

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