ELECTROMAGNETIC RELAY
The electromagnetic relay's innovative design with spaced electromagnetic elements prevents short-circuit formation by scattering powder, ensuring reliable insulation and durability.
Patent Information
- Application Number
- DE112017003810
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2016-07-29
- Filing Date
- 2017-06-22
- Publication Date
- 2025-11-13
- Estimated Expiration
- 2037-06-22
AI Technical Summary
Existing electromagnetic relays suffer from the formation of short-circuit paths due to conductive scattering powder accumulating between fixed terminals, which deteriorates insulation properties.
The electromagnetic relay incorporates a design with a plurality of first electromagnetic elements arranged between fixed terminals, each with a gap, preventing the accumulation of scattering powder and ensuring insulation by maintaining a gap between these elements and the fixed terminals.
This design effectively prevents the formation of short-circuit paths and ensures reliable insulation by preventing the accumulation of scattering powder, enhancing the reliability and durability of the relay.
Smart Images
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Abstract
Description
TECHNICAL AREA
[0001] The present invention relates to an electromagnetic relay. STATE OF THE ART
[0002] An electromagnetic relay disclosed in patent specification 1 comprises: a housing having an enclosed space inside; a pair of fixed terminals attached to the housing in an electrically independent manner; and a plate-like movable contact element, which is movably arranged in the enclosed space opposite a pair of fixed terminals such that it approaches or moves away from the pair of fixed terminals. A fixed contact is attached to each end of the pair of fixed terminals located in the enclosed space. A pair of movable contacts, each arranged opposite the pair of fixed contacts, are attached to the movable contact element.
[0003] Furthermore, the electromagnetic relay comprises a first electromagnetic element, which is electrically independently attached to the pair of fixed terminals of the housing, and a second electromagnetic element, which is arranged opposite one end of the first electromagnetic element in the direction of movement of the movable contact and is attached to the movable contact in such a way that it does not come into contact with the first electromagnetic element. When the pair of fixed contacts and the pair of movable contacts in this electromagnetic relay come into contact with each other and a current flows through the movable contact, a magnetic flux is generated through the first electromagnetic element and the second electromagnetic element, and an electromagnetic attraction force acts between the first electromagnetic element and the second electromagnetic element.Further prior art is formed by patent publication 2. DOCUMENT OF THE STATUS OF THE TECHNICAL PATENT PUBLICATION Patent specification 1: JP 5 559 662 B2 Patent Publication 2: EP 2 549 498 A1 Brief description of the invention; problems to be solved by the invention
[0004] In an electromagnetic relay, an electromagnetic repulsion force is balanced by the electromagnetic attraction force generated between the first electromagnetic element and the second electromagnetic element to ensure contact reliability between the fixed contact and the moving contact, whereby the electromagnetic repulsion force is generated when the pair of fixed contacts and the pair of moving contacts come into contact with each other to allow a current flow.
[0005] Meanwhile, at the moment of opening and closing of the pair of fixed contacts and the pair of moving contacts, the contact powder, melted by the heat of an electric arc, is scattered (hereinafter referred to as scattering powder) in conjunction with the contact and separation of the pair of fixed contacts and the pair of moving contacts, whereby the arc is generated between the pair of fixed contacts and the pair of moving contacts. If this scattering powder accumulates between the pair of fixed contacts and the first electromagnetic element, a short-circuit path is formed between the pair of fixed contacts via the scattering powder, since the scattering powder is conductive and thus causes a significant deterioration of the insulating properties of the electromagnetic relay.
[0006] An object of the present invention is therefore to provide an electromagnetic relay capable of preventing the formation of a short circuit between a pair of fixed terminals by a scattering powder and ensuring insulation. This object is achieved by an electromagnetic relay according to claim 1. Preferred embodiments are the subject of the dependent claims. MEANS TO SOLVENT THE PROBLEM
[0007] The invention is defined by the claims. Aspects of the invention are described below. An electromagnetic relay according to claim 1 comprises, among other things: a box-shaped insulating housing in which a closed space is formed; a pair of fixed terminals that are electrically independent of one another and each have a fixed contact arrangement surface in the closed space; a plate-like, conductive movable contact element provided in the closed space, having a first surface that faces the fixed contact arrangement surfaces of the pair of fixed terminals and is movably arranged such that the first surface approaches and moves away from the fixed contact arrangement surfaces of the pair of fixed terminals; a pair of fixed contacts,which are each provided on the fixed contact arrangement surfaces of the pair of fixed terminals; a pair of movable contacts, each provided on the first surface of the movable contactor and each arranged opposite the pair of fixed contacts, each coming into contact with the pair of fixed contacts when the movable contactor approaches the pair of fixed terminals, and arranged such that they each separate from the pair of fixed contacts when the movable contactor separates from the pair of fixed terminals; a plurality of first electromagnetic elements, which are arranged electrically independently of one another between the pair of fixed terminals in the housing with a gap between them in a first direction, which is an arrangement direction of the pair of fixed terminals,and which are electrically independently attached to the pair of fixed terminals and extend in a top view along a direction of movement of the movable contactor in a second direction orthogonal to the first direction; and a second electromagnetic element comprising a pair of opposing sections arranged to clamp the movable contactor in the second direction and extending along the first direction, and a connecting section attached to a second face of the movable contactor on the opposite side of the first face and configured to connect the pair of opposing sections on the side of the second face, the second electromagnetic element being configured such thatthat the pair of opposing sections is arranged opposite one end of the plurality of first electromagnetic elements on the side of the movable contactor in the direction of movement, and that a gap is provided between the second electromagnetic element and one end of the plurality of first electromagnetic elements when the pair of movable contacts comes into contact with the pair of stationary contacts. IMPACT OF THE INVENTION
[0008] According to the electromagnetic relay of the above aspect, it is possible, by means of the plurality of first electromagnetic elements, to prevent the formation of a short-circuit path between a pair of fixed terminals by means of a scattering powder and to ensure the insulation between the pair of fixed terminals and the plurality of first electromagnetic elements, which are arranged with a gap in the arrangement direction of the pair of fixed terminals electrically independently of each other between the pair of fixed terminals of the housing, and which are attached electrically independently to the pair of fixed terminals. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view showing an electromagnetic relay according to an embodiment of the present invention. Fig. Figure 2 is a sectional view of the electromagnetic relay of Fig. 1 along line II-II of Fig. 1 in a return state. Fig. Figure 3 is a sectional view of the electromagnetic relay from Fig. 1 along line II-II of Fig. 1 in a working state. Fig. Figure 4 is a schematic representation of a contact mechanism section in the return state to explain a first electromagnetic element of the electromagnetic relay of Fig. 1. Fig. 5 is a sectional view along line VV of Fig. 4. FORM OF EXECUTION OF THE INVENTION
[0009] One embodiment of the present invention is described below with reference to the accompanying drawings. In the following description, terms (such as "top," "bottom," "right," "left," "side," and "end") are used where necessary to indicate specific directions or positions. However, the use of these terms serves to improve understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. The following description is merely exemplary and is not intended to limit the present invention, its application, or use. Furthermore, the drawings are schematic, and proportions or the like do not necessarily correspond to the actual dimensions.
[0010] As in Fig. As shown in Figure 1, an electromagnetic relay 100 of an embodiment of the present invention has an insulating housing 1 and a pair of fixed terminals 31a, 31b which are attached to the housing 1. ... Fig. 2 and Fig. As shown in Figure 3, the electromagnetic relay 100 is arranged symmetrically to a plane CP which passes through the centers of the pair of fixed terminals 31a, 31b and extends in a direction orthogonal to the arrangement direction of the pair of fixed terminals 31a, 31b.
[0011] As in Fig. 2 and Fig. As shown in Figure 3, an enclosed space 70 is formed inside the housing 1, and the electromagnetic relay 100 has a conductive, plate-like movable contact element 32 in the enclosed space 70, which is arranged opposite the pair of fixed terminals 31a, 31b. Furthermore, the electromagnetic relay 100 comprises a pair of fixed contacts 33a, 33b, which are provided on the pair of fixed terminals 31a, 31b in the enclosed space 70, and a pair of movable contacts 34a, 34b, which are arranged on the movable contact element 32 opposite the pair of fixed contacts 33a, 33b.
[0012] As in Fig. 2 and Fig. As shown in Figure 3, the electromagnetic relay 100 comprises two first electromagnetic elements 71a, 71b, which are attached between the pair of fixed terminals 31a, 31b of the housing 1, and a second electromagnetic element 72, which is attached to the movable contactor 32 such that it is at one end (i.e., the lower end in Fig. 2) each first electromagnetic element 71a, 71b is arranged opposite each other.
[0013] It should be noted that the direction in which the pair of fixed terminals 31a, 31b is arranged is defined as the X-direction, and the vertical direction of the electromagnetic relay 100 (i.e., a vertical direction in Fig. 2) is defined as the Z-direction. Furthermore, a direction orthogonal to the X- and Z-directions is defined as the Y-direction.
[0014] As in Fig. 2 and Fig. As shown in Figure 3, the housing 1 is composed of a box 10, a lid 20 and a section 30 which forms the enclosed space 70 which is provided inside the box 10 and the lid 20.
[0015] As in Fig. As shown in Figure 1, box 10 has a rectangular box shape. As in Fig. As shown in Figure 2, the box 10 also has an opening on the top side in the Z direction.
[0016] As in Fig. As shown in Figure 1, the side surface of the box 10 is provided in the Y direction with connection notches 11, into which a coil connection 43 protrudes, and a mounting hole 12 for fastening the box 10 and the cover 20.
[0017] As in Fig. As shown in Figure 1, the lid 20 has a rectangular box shape and is attached in such a way that it covers the opening of the box 10. Furthermore, as shown in Figure 1, the lid 20 has a rectangular box shape. Fig. Figure 2 shows an opening on the lower side in the Z direction.
[0018] The upper outer surface of the cover 20 is provided with a partition 21 in the Z-direction, which is arranged substantially centrally in the X-direction and extends in the Y-direction. On both sides of the partition 21 in the X-direction, connection holes 22 are provided, into which the pair of fixed connections 31a, 31b project. Although not shown, the opening of the cover 20 is provided with locking latches for securing the box 10 and the cover 20 to each other at the mounting holes 12 of the box 10.
[0019] As in Fig. As shown in Figure 2, the enclosed space section 30 is composed of an insulating rectangular ceramic plate 52 along an XY plane, a rectangular cylindrical flange 51 extending downwards in the Z direction from the edge of the ceramic plate 52, a plate-like first yoke 53 arranged along the XY plane at the lower edge of the flange 51, and a circular or square cylindrical body with a base 54 extending downwards in the Z direction from the vicinity of the central section of the first yoke 53. The flange 51, the ceramic plate 52, and the first yoke 53 are integrated, and the first yoke 53 and the cylindrical body 54 with a base are hermetically connected.
[0020] The flange 51 has an opening at its upper and lower ends in the Z direction and has an inner insulating shell 511 that covers its outer circumference.
[0021] The ceramic plate 52 is arranged to close the opening on the top of the flange 51 in the Z-direction. The ceramic plate 52 is provided with a pair of connection holes 521, which are arranged opposite the connection holes 22 of the cover 20. The pair of fixed connections 31a, 31b are inserted into their respective connection holes 521 and secured by brazing.
[0022] The first yoke 53 is arranged such that it closes the lower opening of the flange 51 in the Z-direction. A hole section 531 is provided in the central section of the first yoke 53. A movable shaft 35 is movably inserted into the hole section 531.
[0023] The flanged cylindrical body 54 with base extends from the first yoke 53 to the base of the box 10 and is arranged to cover the hole section 531 of the first yoke 53. The cylindrical body 54 with base accommodates within it the movable shaft 35, a fixed iron core 57 attached to the first yoke 53, and a movable iron core 58 attached to the top (i.e., at the lower end in the Z-direction) of the movable shaft 35. A return spring 59 is provided between the fixed iron core 57 and the movable iron core 58 to drive the movable iron core 58 downwards in the Z-direction.
[0024] As in Fig. As shown in Figure 2, each fixed terminal 31a, 31b has a substantially cylindrical shape and is electrically independent of each other and attached to the ceramic plate 52 of the housing 1. The pair of fixed terminals 31a, 31b is arranged at a distance along a first direction (i.e., the X-direction), which is its arrangement direction, and a portion of each fixed terminal 31a, 31b lies within the enclosed space 70.
[0025] On the end face of each fixed terminal 31a, 31b located in the enclosed space 70 (i.e., on the lower end face in the Z direction), a fixed contact arrangement surface 311 is provided along the XY plane. Fixed contacts 33a, 33b are provided on each of the fixed contact arrangement surfaces 311. The fixed contacts 33a, 33b can be formed as a single unit with the corresponding fixed terminals 31a, 31b or separately from the corresponding fixed terminals 31a, 31b.
[0026] As in Fig. As shown in Figure 2, the movable contact transmitter 32 has a first surface 321 along the XY plane, which is arranged opposite the pair of fixed terminals 31a, 31b, and a second surface 322 along the XY plane on the side opposite the first surface 321.
[0027] A pair of movable contacts 34a, 34b is provided on the first surface 321 of the movable contactor 32. That is, the first surface 321 is a movable contact arrangement surface, and the pair of movable contacts 34a, 34b are electrically connected to each other by the movable contactor 32. The movable contacts 34a, 34b are each arranged opposite the fixed contacts 33a, 33b. The movable contacts 34a, 34b can be formed as one piece with the movable contactor 32 or separately from it.
[0028] As in Fig. 2 and Fig. Figure 3 shows a coil spring 50, which expands and contracts along the Z-direction, and a coil spring retainer section 36, which holds the coil spring 50 together with the movable contact sensor 32, in the Z-direction below the movable contact sensor 32 such that the movable contact sensor 32, the coil spring 50, and the coil spring retainer section 36 are movable as a single unit in the Z-direction. The coil spring retainer section 36 has a support plate section 37, a pair of support sections 38, and a connecting rod 39.
[0029] The support plate section 37 clamps the helical spring 50 together with the movable contact element 32. The two support sections 38 extend from both ends, which are opposite each other in a top view along the Z-direction of the support plate section 37, in a second direction (i.e., in the Y-direction) that is orthogonal to the first direction (i.e., the X-direction), to both ends of the movable contact element 32 in the Y-direction. As shown in Fig. As shown in Figure 5, each of the pair of support sections 38 is arranged such that each of the opposing sections 73 of the second electromagnetic element 72 lies between each of the pair of support sections 38 and the movable contactor 32. Furthermore, the connecting rod 39 is provided on the first surface 321 of the movable contactor 32. The connecting rod 39 is arranged centrally between the pair of movable contacts 34a, 34b and extends in the second direction (i.e., in the Y-direction) to connect the pair of support sections 38.
[0030] An upper end of the movable shaft 35 is integrally connected to a substantially central section of the support plate section 37, such that the support plate section 37 and the movable shaft 35 are integrally movable in the Z-direction. That is, the movable shaft 35 extends downwards from the support plate section 37 in the Z-direction and is arranged such that a shaft center of the movable shaft 35 coincides with the plane CP in a top view along the Y-direction.
[0031] Each of the first electromagnetic elements 71a, 71b has an essentially rectangular plate shape and runs parallel to each other in the second direction (i.e., in the Y-direction), as shown in Fig. Figure 5 shows that each of the first electromagnetic elements 71a, 71b is electrically independent of each other on the inner surface of the ceramic plate 52 forming the housing 1 on the side of the enclosed space 70 and is electrically independent of each other attached to each of the pair of fixed terminals 31a, 31b.
[0032] That is, a gap 91 is formed between the fixed terminal 31a on the left side in the X direction and the first electromagnetic element 71a on the left side in the X direction, a gap 92 is formed between the first electromagnetic element 71a on the left side in the X direction and the first electromagnetic element 71b on the right side in the X direction, and a gap 93 is formed between the first electromagnetic element 71b on the right side in the X direction and the fixed terminal 31b on the right side in the X direction. As in Fig. As shown in Figure 3, the connecting rod 39 can be inserted into the space 92.
[0033] Furthermore, each of the first electromagnetic elements 71a, 71b consists of a wall element that extends in the second direction (i.e., Y-direction) from one end to the other end of the inner surface of the housing 1 forming the enclosed space 70. In this electromagnetic relay 100, as in Fig. 5 shown, each of the first electromagnetic elements 71a, 71b arranged such that their two ends in the Y direction are in contact with a magnet holder 56, which is described below.
[0034] As in Fig. As shown in Figure 5, the second electromagnetic element 72 comprises the pair of opposing sections 73 arranged such that they clamp the movable contactor 32 in the second direction (i.e., in the Y direction) and extend along the first direction (i.e., in the X direction), and a connecting section 74 arranged on the second surface 322 of the movable contactor 32, connecting the pair of opposing sections 73 on the side of the second surface 322.
[0035] An end surface 711 and an end surface 731 are arranged opposite each other, and a gap 75 is formed between them, wherein the end surface 711 corresponds to each of the first electromagnetic elements 71a, 71b on the side of the movable contactor 32 (i.e., the lower side in the Z-direction of the movable contactor 32, which is the direction of movement) and the end surface 731 corresponds to each of the pair of opposing sections 73 of the second electromagnetic element 72 on the side of each of the pair of fixed terminals 31a, 31b (i.e., on the upper side of the movable contactor 32 in the direction of movement). Even when the pair of fixed contacts 33a, 33b and the pair of movable contacts 34a, 34b come into contact with each other, the gap 75 is always formed without being closed by the respective end faces 711 of the first electromagnetic elements 71a, 71b and the respective end faces 731 of the second electromagnetic element 72.
[0036] The first electromagnetic element 71 preferably has a height H in the Z-direction that satisfies the following condition. That is, in the top view along the second direction (i.e., in the Y-direction), as shown in Fig. As shown in Figure 4, L is a straight line connecting an edge P1 with an edge P2, where P1 is an edge of the movable contact 34a located near the first electromagnetic element 71, and P2 is an edge of the end face 711 of the first electromagnetic element 71a located away from the movable contact 34a and near the movable contact 34a. Here, in the first electromagnetic element 71a, an angle θ formed between a straight line L and the Z-axis passing through edge P1 is preferably larger than an angle θ1 formed between a straight line L1 passing through an intersection point P3 of the ceramic plate 52 with the first electromagnetic element 71b and the Z-axis passing through edge P1, and a height H of the first electromagnetic element 71a is preferably larger than H1.
[0037] Generally, at the moment of opening and closing of a pair of fixed contacts and a pair of moving contacts, the contact powder, which is melted by the heat of an electric arc, is scattered (the scattered contact powder is hereinafter referred to as scattering powder) in conjunction with the contact and separation of the pair of fixed contacts and the pair of moving contacts, whereby the electric arc is generated between the pair of fixed contacts and the pair of moving contacts. If this scattering powder accumulates between the pair of fixed terminals 31a, 31b and the first electromagnetic elements 71a, 71b, a short-circuit path is formed between the pair of fixed terminals 31a, 31b via the scattering powder, since the scattering powder is conductive and thereby causes a significant deterioration of the insulating properties between the pair of fixed terminals 31a, 31b.
[0038] By setting the height H of each of the first electromagnetic elements 71a, 71b greater than the height H1, it is possible to prevent the ingress of the scattering powder, generated by the contact and separation of the pair of fixed contacts 33a, 33b and the pair of movable contacts 34a, 34b, into the space 92 between the first electromagnetic elements 71a, 71b, which is located in the middle of the spaces between the pair of fixed contacts 31a, 31b. This prevents the accumulation of scattering powder in the space 92. In other words, the first electromagnetic elements 71a, 71b prevent the accumulation of scattering powder on the ceramic plate 52 in the space 93 between the pair of fixed terminals 31a, 31b, thus making it possible to more reliably prevent the formation of a short circuit path between the pair of fixed terminals 31a, 31b.
[0039] A pair of permanent magnets 55, 55 and an arc shield 61 are provided in the enclosed space inside the flange 51.
[0040] The pair of permanent magnets 55, 55 are arranged opposite each other at both ends in the X-direction inside the flange 51 such that the pair of fixed contacts 33a, 33b and the pair of movable contacts 34a, 34b are located between them. An insulating magnet holder 56 holds the pair of permanent magnets 55, 55. The magnet holder 56 extends along the top surface, in the Z-direction, of the first yoke 53 to the movable shaft 35.
[0041] As in Fig. 2 and Fig. As shown in Figure 3, the arc shield 61 is arranged such that it protects both sides of the pair of fixed contacts 33a, 33b and the pair of movable contacts 34a, 34b in the Y direction (the rear and the front side in Fig. 2) and their outer side in the X direction (the sides that are closer to the adjacent permanent magnets 55).
[0042] As in Fig. Figure 2 shows an electromagnet section 40 consisting of an insulating coil former 41, a coil 42 wound around the coil former 41, and a coil terminal 43 attached to the coil former 41 (in Fig. (1 shown) is composed. By applying a voltage to the coil 42, the electromagnet 40 moves the movable shaft 35 up and down along the Z-direction to cause the movable contactor 32 to approach or move away from the stationary contact arrangement surfaces 311 of the pair of stationary terminals 31a, 31b.
[0043] Housing 1 contains a second yoke 44 with a substantially U-shaped cross-section. The second yoke 44 is connected to the first yoke 53 and arranged in housing 10 such that, together with the first yoke 53, it surrounds the electromagnet 40.
[0044] Next, the operating principle of the electromagnetic relay 100 will be described with reference to Fig. 2 and Fig. 3 described. Fig. Figure 2 represents the electromagnetic relay 100 in a return state, and Fig. Figure 3 represents the electromagnetic relay 100 in an operating state.
[0045] If, in the return state of the electromagnetic relay 100, no voltage is present at the coil 42 of the electromagnet section 40, as in Fig. As shown in Figure 2, the movable iron core 58, which is attached to the tip of the movable shaft 35, is pushed downwards in the Z direction by the return spring 59, and the pair of fixed terminals 31a, 31b and the pair of movable contacts 34a, 34b are separated from each other.
[0046] If in the Fig. In the return state shown in Figure 2, when a voltage is applied to the coil 42 of the electromagnetic relay 100, the movable iron core 58 is magnetically attracted to the stationary iron core 57 and moves upwards in the Z-direction against the spring force of the return spring 59. As the movable iron core 58 moves, the movable shaft 35 moves upwards in the Z-direction to move the movable contact 32 upwards in the Z-direction via the helical spring 50, and the first surface 321 of the movable contact 32 approaches the pair of stationary terminals 31a, 31b. When the movable contact 32 has approached the pair of stationary terminals 31a, 31b, as shown in Figure 2, the movable contact 32 is pressed forwards. Fig. As shown in Figure 3, the pair of movable contacts 34a, 34b, which is provided on the first surface 321 of the movable contactor 32, each comes into contact with the pair of fixed contacts 33a, 33b.
[0047] If a current flows in the movable contactor 32, for example in the X direction from left to right, a magnetic flux is generated in the direction that is in Fig. 5 is indicated by an arrow A, and a magnetic attraction force acts between the first electromagnetic elements 71a, 71b and the second electromagnetic element 72. This magnetic attraction force acts in a direction that cancels out the electromagnetic repulsion force generated between the pair of fixed contacts 33a, 33b and the pair of moving contacts 34a, 34b. This makes it possible to ensure contact reliability between the pair of fixed contacts 33a, 33b and the pair of moving contacts 34a, 34b.
[0048] A gap 75 is always formed between each end surface 711 on the lower side of each first electromagnetic element 71a, 71b in the direction of movement of the movable contactor 32 (i.e., in the Z-direction) and each end surface 731 on the upper side, in the direction of movement, of each pair of opposing sections 73 of the second electromagnetic element 72. Adjusting the size of the gap 75 allows the magnetic attraction between the first electromagnetic elements 71a, 71b and the second electromagnetic element 72 to be adjusted.This means that reducing the size of the gap 75 allows an increase in the magnetic attraction force acting between the first electromagnetic elements 71a, 71b and the second electromagnetic element 72, and increasing the size of the gap 75 allows a decrease in the magnetic attraction force acting between the first electromagnetic elements 71a, 71b and the second electromagnetic element 72.
[0049] When the voltage is applied to the coil 42 of the electromagnetic relay 100 in the operating state, which is in Fig. As shown in Figure 3, when the magnetic attraction of the stationary iron core disappears, the movable iron core 58 moves downwards in the Z-direction due to the spring force of the return spring 59. The movable shaft 35 moves downwards in the Z-direction with the movement of the movable iron core 58, the movable contactor 32 is moved downwards in the Z-direction via the helical spring 50, and the first surface 321 of the movable contactor 32 is separated from the pair of stationary terminals 31a, 31b. As shown in Fig. As shown in Figure 2, the pair of movable contacts 34a, 34b, which are provided on the first surface 321 of the movable contactor 32, are each separated from the pair of fixed contacts 33a, 33b when the movable contactor 32 separates from the pair of fixed terminals 31a, 31b.
[0050] This means that the movable contactor 32 is arranged so that the first surface 321 approaches and separates from the pair of fixed terminals 31a, 31b. As in Fig. As shown in Figure 2, the pair of movable contacts 34a, 34b is arranged such that it separates from the pair of fixed contacts 33a, 33b when the movable contactor 32 separates from the pair of fixed terminals 31a, 31b. As shown in Fig. As shown in Figure 3, the pair of movable contacts 34a, 34b is also arranged such that it comes into contact with the pair of fixed contacts 33a, 33b when the movable contactor 32 approaches the pair of fixed terminals 31a, 31b.
[0051] In the electromagnetic relay 100 of the embodiment, a plurality of first electromagnetic elements 71a, 71b are provided between the fixed terminals 31a, 31b of the housing 1. These elements are electrically independent of one another, with the space 92 between them being formed in the arrangement direction of the pair of fixed terminals 31a, 31b. The elements are attached to the pair of fixed terminals 31a, 31b in an electrically independent manner. This prevents the formation of a short circuit between the pair of fixed terminals 31a, 31b by the scattering powder and ensures insulation between the pair of fixed terminals 31a, 31b.
[0052] Furthermore, each of the first electromagnetic elements 71a, 71b consists of a wall element that extends in the second direction from one end to the other end of the inner surface of the housing 1 forming the enclosed space 70. This prevents scattering powder from entering the space 92 between the first electromagnetic elements 71a, 71b, thereby more reliably preventing the accumulation of scattering powder and the formation of a short-circuit path between the pair of fixed terminals 31a, 31b by scattering powder, and ensuring the insulation between the pair of fixed terminals 31a, 31b.
[0053] Furthermore, the connecting rod 39 of the coil spring holder section 36 can be inserted into the space 92 between the first electromagnetic elements 71a, 71b. This facilitates the adjustment of the gap 75 between each of the first electromagnetic elements 71a, 71b and the second electromagnetic element 72, making it easy to adjust the magnetic attraction acting between each of the first electromagnetic elements 71a, 71b and the second electromagnetic element 72.
[0054] In the electromagnetic relay 100 according to the embodiment, the end face 711 at one end of each first electromagnetic element 71a, 71b is arranged in a position that is further away from the movable contactor 32 than either of the pair of fixed contacts 33a, 33b, but this is not a limiting factor. As in Fig.As shown in Figure 4, the first electromagnetic elements 71a, 71b can, for example, have an end surface 711a located between the pair of fixed contacts 33a, 33b and the movable contactor 32. This prevents the scattering powder from entering the space 92 between the first electromagnetic elements 71a, 71b, thus more reliably preventing the accumulation of scattering powder and the formation of a short-circuit path between the pair of fixed contacts 31a, 31b and ensuring insulation between the pair of fixed contacts 31a, 31b.
[0055] Furthermore, the enclosed space can, if possible, also be an open space or a hermetically sealed space.
[0056] The plurality of first electromagnetic elements 71a, 71b is not limited to two, but three or more may be provided. At least one space may be provided between the first electromagnetic elements.
[0057] Furthermore, the first electromagnetic elements 71a, 71b are not restricted to being arranged parallel to each other. The first electromagnetic elements can be arranged in any way, as long as there is a gap between the pair of fixed terminals in the first direction, which is the arrangement direction.
[0058] Various embodiments of the present invention have been described in detail with reference to the drawings, and finally, various aspects of the present invention are described.
[0059] An electromagnetic relay of a first aspect of the present invention comprises: a box-shaped insulating housing in which a closed space is formed; a pair of fixed terminals which are electrically independently attached to the housing and each have a fixed contact arrangement surface in the closed space; a plate-like, conductive movable contact element which is provided in the closed space and has a first surface which is opposite the fixed contact arrangement surfaces of the pair of fixed terminals and is movably arranged such that the first surface approaches and moves away from the fixed contact arrangement surfaces of the pair of fixed terminals; a pair of fixed contacts which are each provided on the fixed contact arrangement surfaces of the pair of fixed terminals;a pair of movable contacts, each provided on the first surface of the movable contactor and each arranged opposite the pair of fixed contacts, each coming into contact with the pair of fixed contacts when the movable contactor approaches the pair of fixed terminals, and arranged in such a way that they each separate from the pair of fixed contacts when the movable contactor separates from the pair of fixed terminals;a plurality of first electromagnetic elements, each electrically independent of the other, arranged between the pair of fixed terminals in the housing with a gap in a first direction, which is an arrangement direction of the pair of fixed terminals, and which are electrically independent attached to the pair of fixed terminals and extend in a top view along a direction of movement of the movable contactor in a second direction, which is orthogonal to the first direction;and a second electromagnetic element comprising a pair of opposing sections arranged to clamp the movable contact in the second direction and extending along the first direction, and a connecting section attached to a second surface of the movable contact on the opposite side of the first surface and configured to connect the pair of opposing sections on the side of the second surface, the second electromagnetic element being configured such that the pair of opposing sections on the side of the movable contact is opposite each end of the plurality of first electromagnetic elements in the direction of movement, and a gap is formed between the second electromagnetic element and each end of the plurality of first electromagnetic elements when the pair of movable contacts comes into contact with the pair of fixed contacts.
[0060] According to the electromagnetic relay of the first aspect, it is possible, by means of the multitude of first electromagnetic elements, which are arranged electrically independently of each other between the pair of fixed terminals in the housing with a gap in the arrangement direction of the pair of fixed terminals, and which are attached electrically independently to the pair of fixed terminals, to prevent the formation of a short circuit path between the pair of fixed terminals by means of scattering powder and to ensure the insulation between the pair of fixed terminals.
[0061] In an electromagnetic relay of a second aspect of the present invention, each of the plurality of first electromagnetic elements consists of a wall element which extends in the second direction from one end to the other end of an inner surface of the housing forming the enclosed space.
[0062] According to the electromagnetic relay of the second aspect, the accumulation of scattering powder in the space between the first electromagnetic elements can be prevented, making it possible to more reliably prevent the formation of a short circuit path between the pair of fixed terminals through the scattering powder and to ensure insulation.
[0063] In an electromagnetic relay of a third aspect of the present invention, the respective ends of the plurality of first electromagnetic elements lie in the approach and separation direction of the movable contactor between the pair of fixed contacts and the movable contactor.
[0064] According to the electromagnetic relay of the third aspect, the accumulation of scattering powder in the space between the first electromagnetic elements can be prevented, making it possible to more reliably prevent the formation of a short circuit path between the pair of fixed terminals by the scattering powder and to ensure insulation.
[0065] An electromagnetic relay of a fourth aspect of the present invention further comprises a helical spring which comes into contact with the second surface of the movable contactor and expands and contracts along the approach and separation direction of the movable contactor;and a coil spring holder section comprising a support plate section configured to clamp the coil spring together with the movable contact element, a pair of support sections extending from both ends of the support plate section opposite each other in the second direction to both ends of the movable contact element in the second direction and arranged such that each of the opposite sections of the pair of support sections of the second electromagnetic element lies between each of the pair of support sections and the movable contact, and a connecting rod provided on the first surface of the movable contact element and extending in the second direction to be connected to the pair of support sections, the connecting rod being provided such that it can be inserted into the space between the plurality of first electromagnetic elements.
[0066] According to the electromagnetic relay of the fourth aspect, the adjustment of the gap between each of the first electromagnetic elements and the second electromagnetic element is facilitated, making it easy to adjust the magnetic attraction force acting between each of the first electromagnetic elements and the second electromagnetic element.
[0067] The desired effects can be achieved by appropriately combining selected embodiments or modified examples of the above embodiments or modified examples. While it is possible to combine embodiments, examples, or an embodiment and an example, it is also possible to combine features in different embodiments or examples.
[0068] Although the present invention has been fully described with reference to preferred embodiments and the accompanying drawings, a person skilled in the art will likely conceive of various variants or modifications. It is understood that such variants or modifications fall within the scope of the present invention as defined by the accompanying claims, unless they deviate from it. INDUSTRIAL APPLICABILITY
[0069] The electromagnetic relay of the present invention is not limited to the above embodiment, but is applicable to other electromagnetic relays. DESCRIPTION OF REFERENCE MARKS 1 case 10 boxes 11 Connection notch 12 mounting holes 20 lids 21 Partition wall 22 connection holes 30 Section forming the enclosed space 31a, 31b fixed connection 311 fixed contact arrangement surface 32 movable contactors 321 first area 322 second area 33a, 33b fixed contact 34a, 34b movable contact 35 movable shaft 36 coil spring retainer section 37 Support plate section 38 Support section 39 Stabilizer link 40 Electromagnetic section 41 coil formers 42 coil 43 Coil connection 44 second yoke 50 coil springs 51 flange 52 ceramic plates 521 Connection hole 53 first yoke 531 holes 54 cylindrical bodies with bases 55 permanent magnet 56 magnetic holders 57 fixed iron core 58 movable iron core 59 Return spring 61 Arc shielding 70 enclosed space 71a, 71b first electromagnetic element 711 End surface 72 second electromagnetic element 73 opposite section 731 End surface 74 Connecting section 75 gap 91, 92, 93 space 100 electromagnetic relays H Height of the first electromagnetic element P1 Edge of the movable contactor near the first electromagnetic element P2 Edge furthest from the movable contactor on the end face of the first electromagnetic element near the movable contact P3 Intersection of the ceramic plate and the first electromagnetic element L P1 and P2 connecting straight line θ Angle formed by the line L to the Z-axis A magnetic flux
Claims
Electromagnetic relay comprising: a box-shaped insulating housing (1) in which a closed space (70) is formed; a pair of fixed terminals (31a, 31b) which are electrically independently attached to the housing (1) and each have a fixed contact arrangement surface (311) in the closed space (70); a plate-like, conductive movable contactor (32) which is provided in the closed space (70), has a first surface (321) which is opposite the fixed contact arrangement surfaces (311) of the pair of fixed terminals (31a, 31b) and is movably arranged such that the first surface (321) approaches and separates from the fixed contact arrangement surfaces (311) of the pair of fixed terminals (31a, 31b); a pair of fixed contacts (33a, 33b) which each have a fixed contact arrangement surface (311) of the pair of fixed terminals. (31a, 31b) are provided; a pair of movable contacts (34a, 34b),which are each provided on the first surface (321) of the movable contactor (32) and are each arranged opposite the pair of fixed contacts (33a, 33b), each come into contact with the pair of fixed contacts (33a, 33b) when the movable contactor (32) approaches the pair of fixed terminals (31a, 31b), and are arranged such that they each separate from the pair of fixed contacts (33a, 33b) when the movable contactor (32) separates from the pair of fixed terminals (31a, 31b); a plurality of first electromagnetic elements (71a, 71b) which are arranged electrically independently of one another between the pair of fixed terminals (31a, 31b) in the housing (1) with a space (92) between them in a first direction (X), which is an arrangement direction of the pair of fixed terminals (31a, 31b), and which electrically independent at the pair of fixed terminals (31a,31b) are attached and extend in a top view along a direction of movement (Z) of the movable contactor (32) in a second direction (Y) which is orthogonal to the first direction (X); and a second electromagnetic element (72) comprising a pair of opposing sections (73) arranged to clamp the movable contactor (32) in the second direction (Y) and extending in the first direction (X), and a connecting section (74) attached to a second surface (322) of the movable contactor (32) on the opposite side of the first surface (321) and configured to connect the pair of opposing sections (73) on the side of the second surface (322), the second electromagnetic element (72) being configured such thatthat the pair of opposing sections (73) on the side of the movable contactor (32) in the direction of movement (Z) is each opposite one end of the plurality of first electromagnetic elements (71a, 71b), a gap (75) is present between the second electromagnetic element (72) and one end of the plurality of first electromagnetic elements (71a, 71b) when the pair of movable contacts (34a, 34b) each comes into contact with the pair of fixed contacts (33a, 33b), the plurality of first electromagnetic elements (71a, 71b) is a pair of first electromagnetic elements (71a, 71b) which has a first electromagnetic element (71a) and a second electromagnetic element (71b) each with an end face facing the first surface (321), the pair of movable contacts (34a, 34b) has a first movable contact (34a) which is located near the first electromagnetic element (71a). Elements (71a) is arrangedand a second movable contact (34b) which is located near the second first electromagnetic element (71b), and in the top view along the second direction (Y), a straight line which passes through an edge (P1) of the first movable contact (34a) and an edge (P2) of the end face of the first first electromagnetic element (71a), is a first straight line (L) wherein the edge (P1) of the first movable contact (34a) is located near the first first electromagnetic element (71a) and the edge (P2) of the end face of the first first electromagnetic element (71a) is spaced apart from the first movable contact (34a), a straight line which passes through the edge (P1) of the first movable contact (34a) and is orthogonal to the first direction (X), is a second straight line (P1), and a straight line,which passes through the edge (P1) of the first movable contact (34a) and an intersection point (P3) of the second first electromagnetic element (71b) with the housing (1), is a third straight line (L1), wherein an angle (θ) formed between the first straight line (L) and the second straight line (P1) is greater than an angle (θ1) formed between the second straight line (P1) and the third straight line (L1). Electromagnetic relay according to claim 1, wherein each of the plurality of first electromagnetic elements (71a, 71b) consists of a wall element which extends in the second direction (Y) from one end to the other end of an inner surface of the housing (1) forming the enclosed space (70). Electromagnetic relay according to claim 1 or 2, wherein the respective ends of the plurality of first electromagnetic elements (71a, 71b) are arranged in the direction of movement (Z) of the movable contactor (32) between the pair of fixed contacts (33a, 34a) and the movable contactor (32). Electromagnetic relay according to one of claims 1 to 3, further comprising: a helical spring (50) which comes into contact with the second surface (322) of the movable contactor (32) and expands and contracts along the direction of movement (Z) of the movable contactor (32); and a helical spring retainer section (36) comprising a support plate section (37) which is configured to clamp the helical spring (50) together with the movable contactor (32); a pair of support sections (38) which extend from both ends of the support plate section (37) opposite each other in the second direction (Y) to both ends of the movable contactor (32) in the second direction (Y) and are arranged such that each of the opposite sections (73) of the second electromagnetic element (73) of the pair lies between the pair of support sections (38) and the movable contactor (32); and a connecting rod (39).which is provided on the first surface (321) of the movable contact transmitter (32) and extends in the second direction (Y) to be connected to the pair of support sections (38), wherein the connecting rod (39) is provided such that it can be inserted into the space (75) between the plurality of first electromagnetic elements (71a, 71b).
Citation Information
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