JP2005183097A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay that reduces the damages to contacts by a simple configuration, thereby realizing a longer lifetime and a higher reliability. <P>SOLUTION: An electromagnetic relay 1 includes a coil 2, an iron core 3, a yoke 31 forming a magnetic path, a fixed terminal 5 having fixed contacts 4, a movable spring terminal 7 having movable contacts 6, an armature block 8 attracted or repulsed by a magnetic pole 3a depending on the excitation status of the coil 2, and causes the movable contacts 6 to be abutted or released onto the fixed contacts 4 by driving the movable contact 6, and a housing for fixing these. The movable contacts 6 deviate from each other in a direction orthogonal to a direction extending from a fixed end 72a of the movable spring terminal 7 toward a free end 72b, and include a contact 6a for causing current to flow and a contact 6b for resisting to rush current that are arrayed and arranged at positions deviated in the extending direction and have different shapes and/or materials. Also, a slit 7a is provided for severing partially between the contact 6a for causing current to flow and the contact 6b for resisting to rush current up to the free end 72b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic relay including a movable spring terminal having a movable contact.

Conventionally, in an electromagnetic relay having a movable contact, proposals have been made to achieve reliable contact and separation between the movable contact and the fixed contact. For example, at the tip of a plurality of parallel spring materials Some of them are provided with movable contacts to ensure contact by dispersing the contacts. In addition, when the movable contact is released after coming into contact with the fixed contact, the plurality of movable contacts at the tip of the parallel spring material are reliably separated including the movable contact that has been welded to the fixed contact. What tied the front-end | tip of the material is known (for example, refer patent document 1).
Japanese Utility Model Publication No. 5-31083

  However, the electromagnetic relay having the movable contact as described above still has the following problems. A conventional movable spring terminal having a movable contact and a fixed terminal having a fixed contact will be described with reference to FIG. As shown in FIGS. 7A and 7C, the movable spring terminal 79 is a tip of a parallel spring formed by dividing the spring material 72 to its free end 72b by a slit 7a, and is substantially from the tip of the spring. Two movable contacts 6 are provided at the same distance, and the fixed terminal has a fixed contact 4 at a position corresponding to the movable contact 6 at the tip of the terminal member 50 as shown in FIG. I have. The movable contact 6 and the fixed contact 4 are composed of energizing contacts 4a and 6a and inrush current resistant contacts 4b and 6b having different shapes and materials, respectively.

  However, when the movable contacts 6a and 6b are provided in a so-called twin spring in which the spring material is separated at the tip, that is, the desired operation timing is obtained for both the energizing contact 6a and the inrush current contact 6b, and There is a problem that it is difficult to maintain the contact and separation of each contact in a reliable manner. For example, due to twisting of the twin springs, the flatness of the spring is not obtained and the energizing contact contacts first and a large inrush current flows, causing contact welding and the like, which may cause a malfunction in the electromagnetic relay operation. is there. Further, as shown in Patent Document 1, in the case of a movable spring terminal or fixed terminal provided with a contact that does not distinguish between a contact for energization and a contact for inrush current only by connecting the tips of twin springs, the welding of the contacts As a countermeasure, it is incomplete and there is a risk of malfunction of the electromagnetic relay.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to provide an electromagnetic relay that can reduce contact damage at the time of opening and closing a contact with a simple configuration, and can achieve a long life and high reliability.

  In order to achieve the above object, the invention of claim 1 is directed to a coil, an iron core around which the coil is wound, a fixed terminal having a fixed contact, a movable spring terminal having a movable contact, and an excitation state of the coil. An armature block that is attracted to and separated from the magnetic poles of the iron core, drives the movable contact by this attraction / separation operation, and contacts and separates the movable contact with the fixed contact, and a body that fixes the armature block. In the electromagnetic relay, the movable contact is a current-carrying contact and a rush current-proof contact having different shapes and / or materials arranged side by side at positions substantially orthogonal to the direction extending from the fixed end to the free end of the movable spring terminal. The movable spring terminal is provided with a slit that partially divides between the contact for energization and the contact for inrush current, and the fixed contact is inrush with the contact for energization of the movable contact For current It is an electromagnetic relay, characterized in that a shape and / or power contacts of different material and 耐突 incoming call diverting contacts abuts separable to the respective points.

  According to a second aspect of the present invention, there is provided a coil, an iron core around which the coil is wound, a fixed terminal having a fixed contact, a movable spring terminal having a movable contact, and a magnetic pole of the iron core according to an excitation state of the coil. In the electromagnetic relay comprising: an armature block that is separated by suction and drives the movable contact by the suction / separation operation to bring the movable contact into contact with and is separated from the fixed contact; and a body that fixes the armature block. Are different from each other in the direction perpendicular to the direction extending from the fixed end to the free end of the movable spring terminal and in contact with the current-carrying contacts having different shapes and / or materials arranged side by side in the extension direction. An inrush current contact, and the movable spring terminal is provided with a slit that partially divides between the energization contact and the inrush current contact to a free end, and the fixed contact is the movable contact Through The contact point for inrush current and the contact point for inrush current are provided with a contact point for energization and a contact point for inrush current of different shapes and / or materials that form a pair with each of the contact point for inrush current and the contact point for inrush current. The electromagnetic relay is arranged on the free end side with respect to the position where the pair of energizing contacts is provided.

  According to a third aspect of the present invention, in the electromagnetic relay according to the second aspect, the slit of the movable spring terminal is connected at the free end.

  According to the first aspect of the present invention, the contact between the contacts with no inclination by imparting flexibility to the spring material by the slit without impairing the flatness of the spring material of the movable spring terminal in the portion provided with the movable contact. In addition, since the spring material is not separated by the slit to the free end of the spring material, the spring material on both sides of the slit can cooperate and reliably release the contact when the contact is opened. An electromagnetic relay free from defects can be obtained. In addition, the fact that the free ends of the spring material are not separated can reduce the contact bounce (vibration) at the time of contact, and the current arc at the time of opening and closing the contact is suppressed, which has the effect of destroying the contact damage. Can be further improved.

  In addition, for example, a contact shape that protrudes from the energizing contact and has a step between the contacts is formed so that the inrush-proof contact contacts first, and is formed of a material having resistance to welding. In order to stabilize the time difference between the start of contact so that the contact for inrush current contacts first and then the contact for energization next, it also makes it difficult for welding to occur and causes problems such as contact welding at the time of contact opening and closing Generation and contact damage can be reduced.

  According to the second aspect of the present invention, the slit provided up to the free end of the movable spring terminal imparts flexibility to the spring material, enables flexible contact between the contacts, and the position where the contact for energization is disposed. On the other hand, since the contact point for inrush current is arranged at a position farther from the spring fulcrum position (fixed point) (that is, a position closer to the free end), the spring material moves in a circular arc around the substantially spring fulcrum position. The contact for inrush current can be surely contacted before the contact for energization, and by forming the contact for inrush current with a material that is resistant to welding, the time difference at the start of contact can be stabilized. In addition to ensuring, it is possible to realize an electromagnetic relay in which welding is less likely to occur and the occurrence of problems due to contact welding at the time of opening and closing of the contacts and the damage to the contacts are reduced.

  According to the invention of claim 3, in addition to the effect of claim 2, the flatness of the spring material on both sides of the slit is ensured, the contact bounce at the time of contact contact is reduced by the cooperation of the spring materials on both sides of the slit, and the contact is released. There is an effect of more reliable opening of the contact.

  Hereinafter, an electromagnetic relay according to an embodiment of the present invention will be described with reference to the drawings. 1A, 1B, and 1C show the electromagnetic relay 1 of the present invention, FIG. 2 shows the external assembly of the electromagnetic relay 1, and FIG. 3 shows the internal assembly of the electromagnetic relay 1. FIG. The direction of each part is added in the drawing, and this is referred to as appropriate. As shown in FIG. 1, the electromagnetic relay 1 includes a coil 2, an iron core 3 around which the coil is wound, a yoke 31 that forms a magnetic path with the iron core 3, a fixed terminal 5 having a fixed contact 4, The movable spring terminal 7 having the movable contact 6 is attracted and separated by the magnetic pole 3a of the iron core 3 according to the excitation state of the coil 2, and the movable contact 6 is driven by this attraction and separation operation to fix the movable contact 6 to the fixed contact. 4 is provided with an armature block 8 which is brought into contact with and separated from 4 and a vessel body 10 which fixes them. Further, as shown in FIG. 2, the electromagnetic relay 1 is completed by forming the main body block 1A by incorporating the above-described components into the base 10b of the container body 10, covering the case 10a, and performing a sealing process. The The operation of the electromagnetic relay 1 will be described after the description of the formation of each component and the main body block 1A.

  As shown in FIG. 3, the coil 2 has a coil bobbin 21 having a through hole in the central shaft portion wound around the coil bobbin 21, and a coil terminal 22 embedded in the end of the coil bobbin 21 is connected to the end of the coil wire. It is formed. The coil terminal 22 is held by the base 10b so as to be inserted through the base 10b of the container, and the lower portion of the coil terminal 22 protrudes from the lower surface of the base 10b.

  The iron core 3 has a substantially T-shape made of a flat plate, and the head portion and the leg portion form magnetic poles 3a and 3b, respectively. The T-shaped leg portion is inserted into the through hole in the central shaft portion of the coil bobbin 21, and the T-shaped flat plate surface is fixed so as to be orthogonal to the vertical direction by the positioning structure formed on the coil bobbin 21.

  The yoke 31 has a substantially U-shape that is fitted to the coil bobbin 21 from the right side and bent so as to be magnetically coupled to both the magnetic poles 3a and 3b of the iron core 3, and a parallel portion 31c parallel to the coil 2; An end surface portion 31b having a hole into which the magnetic pole 3b portion of the iron core 3 is fitted, and two opposing magnetic pole pieces 31a sandwiching the magnetic pole 3a of the iron core 3 from above and below are integrally formed. After the yoke 31 is fitted to the coil 2, the iron core 3 is inserted into the center, and an electromagnet block in which the three members are integrated is formed.

  The fixed terminal 5 is provided with two fixed terminals 4 having contact surfaces facing upward on a terminal plate 50 on which external fixed terminals 51 for external connection are formed, respectively, by caulking or the like. The terminal board 55 having the external fixed terminal 56 is a dummy fixed terminal.

  The movable spring terminal 7 is fixed to the terminal plate 70 on which the external movable terminal 71 is formed by fixing one end of a substantially rectangular flat plate-like spring material 72 as a fixed end 72a with a rivet, and close to the other end that becomes the free end 72b. Two movable terminals 6 with their contact surfaces facing each other are secured by caulking or the like. The spring material 72 is bent in a step shape in the vicinity of the fixed end 72a, and a rectangular opening is formed in the bent portion. A side edge 72c on the free end 72b side of the opening is sandwiched between connection grooves 83c of a card 83 to be described later. A slit 7 a is provided between the two movable contacts 6. The slit 7a, the movable contact 6, and the fixed contact 4 will be described later.

  The armature block 8 includes two armatures 82, a permanent magnet 81, and a block-shaped card 83. In a state where the armatures 82 are attracted to the upper and lower sides of the permanent magnet 81, these are fitted into mounting recesses (not shown) of the card 83 to form the armature block 8. A protruding arm 83b is formed on the lower front side of the card 83, and a connecting groove 83c is formed in the arm 83b. Further, on the left and right side surfaces of the card 83, a protrusion 83a serving as a rotation shaft is provided, and the protrusion 83a is fitted into a bearing groove 84 provided in the base 10b.

  The base 10b has a substantially rectangular parallelepiped box shape with an opening at the rear and upper sides, and a partition wall for partitioning the upper and lower sides is provided inside the base 10b. On the left and right wall surfaces, there are formed slits and openings for inserting the terminal plates 50 and 55, and recesses for receiving the external terminals 51, 56 and 71, respectively.

  The incorporation of the above-described components into the base 10b will be described. First, an electromagnet block is inserted from the upper part of the base 10b, and is disposed on a partition wall that partitions the upper and lower sides. Next, the edge 72c of the movable spring terminal 7 is inserted into the connecting groove 83c of the armature block 8, and the armature block 8 and the movable spring terminal 7 are integrated with each other from the rear opening of the base 10b to the base 10b. The protrusion 83a of the card 83 is inserted into the bearing groove 84 of the base 10b. Thereafter, when the fixed terminal 5 and the terminal plate 55 are inserted from the left and right sides of the base 10b, the main body block 1A is completed.

  Next, returning to FIG. 1, the operation of the electromagnetic relay 1 will be described. In a state where the electromagnetic relay 1 is assembled as described above, the armature 82 is housed between the magnetic pole 3 a of the iron core 3 and the magnetic pole piece 31 a of the yoke 31. In the state where the coil 2 is not excited, the force (rotational moment) acting on the armature block 8 is the magnetic force by the permanent magnet 81 and the urging force of the spring material 72 of the movable spring terminal 7. And the armature block 8 is always rotated clockwise about the axis of the projection 83a, that is, the movable contact 6 of the movable spring terminal 7 is upward. It can be positioned and separated from the fixed contact (single-stable electromagnetic relay, normally open). Hereinafter, it is assumed that the electromagnetic relay 1 is the normally open type. Then, when the coil 2 is excited so as to generate a magnetic force that attracts the armature 82 downward, the movable contact 6 is driven downward to come into contact with the fixed contact 4 and the electromagnetic relay 1 enters a closed circuit state. When the excitation of the coil 2 is stopped, the electromagnetic relay 1 returns to the open circuit state by the biasing force of the spring material 72.

  Next, the movable spring terminal 7 will be described with reference to FIG. The movable contacts 6 of the movable spring terminal 7 are displaced from each other in a direction orthogonal to the direction extending from the fixed end 72a of the movable spring terminal 7 to the free end 72b, as shown in FIGS. , A current-carrying contact 6a and an inrush-proof contact 6b, which are arranged and arranged at positions shifted in the extending direction, and have a current-carrying contact 6a and a current-carrying contact 6b between the current-carrying contact 6a and the current-carrying contact 6b. A slit 7a that partially divides the free end 72b is provided. In addition, as shown in FIG. 4B, the corresponding fixed contact 4 forms a pair with each of the energizing contact 6a and the inrush current resistant contact 6b of the movable contact 6 so as to abut and separate. Alternatively, a current-carrying contact 4a and an inrush-proof contact 4b of different materials are provided. Further, as shown in FIG. 4C, the pair of inrush current contacts 6b and 4b is disposed closer to the free end 72b than the position where the pair of energizing contacts 6a and 4a is provided.

  The inrush current-proof contacts 4b and 6b are made of tungsten alloy or the like that is less likely to cause melting damage due to current arc when the contacts are opened and closed, and are higher than the energizing contacts 4a and 6a to make contact step differences. d1 and d2 are provided. Therefore, the pair of inrush current contacts 4b and 6b comes in contact before the pair of energization contacts 4a and 6a. When the inrush current contacts 4b and 6b come into contact with each other and a large inrush current flows and becomes a steady current after a comma of several ms, the energizing contacts 4a and 6a come into contact.

  In addition, the slit 7a provided up to the vicinity of the free end 72b of the movable spring terminal 7 gives flexibility to the spring material and enables flexible contact between the contacts. In the structure in which the inrush current contacts 4b and 6b are arranged at a position closer to the free end 72b, the spring material moves in an arc around the substantially spring fulcrum position so that the inrush current contacts 4b and 6b are energized contacts 4a and 4a. The contact is surely made before 6a.

  Next, the movable spring terminal 7 having another structure will be described with reference to FIG. This movable spring terminal 7 is different from the movable spring terminal shown in FIG. 4 described above in that the slit 7a reaches the free end 7b. The slit 7a provided up to the free end 72b of the movable spring terminal 7 imparts higher flexibility to the spring material and enables flexible contact between the contacts. Since the contact to be contacted first (contact for inrush current) is shifted to the free end side, it is different from the conventional arrangement of two different types of contacts in parallel. It is possible to reliably contact the current-carrying contact, and the occurrence of problems due to contact welding at the time of opening and closing the contact and damage to the contact are reduced.

  Next, the movable spring terminal 7 of still another structure is shown in FIG. The movable spring terminal 7 is shown in FIG. 4 above in that the energizing contact 6a and the inrush current contact 6b of the movable contact 6 in the extending direction of the movable spring terminal 7 are arranged at substantially the same position. Different from the movable spring terminal. Without damaging the flatness of the spring material of the movable spring terminal in the part where the movable contact is provided, the slit can give the spring material flexibility and ensure contact between the contacts without inclination, and to the free end By not being separated by the slit, the spring material on both sides of the slit can cooperate with each other when the contact is opened to reliably open the contact. In addition, a contact step is formed in a shape protruding from the energizing contact so that the inrush current contact contacts first, so that the inrush current contact contacts first and then the energization contact contacts Thus, the time difference of the contact time can be secured stably. The present invention is not limited to the above-described configuration, and various modifications are possible, and any electromagnetic relay having a movable spring contact can be applied.

(A) is a plane sectional view of an electromagnetic relay concerning one embodiment of the present invention, (b) is a side sectional view of the electromagnetic relay, and (c) is another side view of the electromagnetic relay. The external appearance perspective view explaining the assembly of an electromagnetic relay same as the above. The exploded perspective view explaining the assembly of an electromagnetic relay same as the above. (A) is a partial plan view of a movable spring terminal used in the above-described electromagnetic relay, (b) is a partial plan view of a fixed terminal paired with the movable spring terminal, and (c) is a set of the movable spring terminal and the fixed terminal. The partial side view which shows an insertion state, (d) is a perspective view of the movable spring terminal. (A) is a partial plan view of another movable spring terminal used in the above-described electromagnetic relay, (b) is a partial plan view of a fixed terminal paired with the movable spring terminal, and (c) is a perspective view of the movable spring terminal. . (A) is a partial plan view of still another movable spring terminal used for the electromagnetic relay, (b) is a partial plan view of a fixed terminal paired with the movable spring terminal, (c) is a perspective view of the movable spring terminal. Figure. (A) is a fragmentary top view of the movable spring terminal used for the conventional electromagnetic relay, (b) is a fragmentary top view of the stationary terminal which makes a pair with the movable spring terminal, (c) is a perspective view of the movable spring terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Coil 3 Iron core 3a Magnetic pole 4 Fixed contact 5 Fixed terminal 4a, 6a Energizing contact 4b, 6b Contact for inrush current 6 Movable contact 7 Movable spring terminal 7a Slit 8 Armature block 10 Body 72a Fixed end 72b Free end

Claims (3)

A coil, an iron core around which the coil is wound, a fixed terminal having a fixed contact, a movable spring terminal having a movable contact, and the magnetic pole of the iron core are attracted and separated according to the excitation state of the coil. In an electromagnetic relay comprising: an armature block that drives the movable contact by operation to bring the movable contact into contact with and is separated from the fixed contact; and a body that fixes them.
The movable contact includes a contact for energization and a contact for inrush current that are different from each other in shape and / or material arranged side by side at a position substantially orthogonal to the direction extending from the fixed end to the free end of the movable spring terminal,
The movable spring terminal is provided with a slit that partially divides the contact for energization and the contact for inrush current,
The fixed contact includes a current-carrying contact and a current-carrying contact that are different from each other in shape and / or material that contacts and separates the current-carrying contact and the current-proof current contact of the movable contact. Electromagnetic relay. A coil, an iron core around which the coil is wound, a fixed terminal having a fixed contact, a movable spring terminal having a movable contact, and a magnetic pole of the iron core are attracted and separated according to the excitation state of the coil. In an electromagnetic relay comprising: an armature block that drives the movable contact by operation to bring the movable contact into contact with and is separated from the fixed contact; and a body that fixes the armature block.
The movable contacts are deviated from each other in the direction orthogonal to the direction extending from the fixed end to the free end of the movable spring terminal and arranged in a position shifted in the extending direction and for different energies and / or materials. It has a contact and a contact for inrush current,
The movable spring terminal is provided with a slit that partially divides between the energization contact and the inrush current contact to a free end,
The fixed contact includes a current-carrying contact and a current-carrying contact that are different from each other in shape and / or material that form a pair with the current-carrying contact and the current-carrying contact for the movable contact and are separated from each other. ,
The electromagnetic relay according to claim 1, wherein the pair of inrush current contacts is disposed on a free end side from a position where the pair of energizing contacts is provided.   The electromagnetic relay according to claim 2, wherein a slit of the movable spring terminal is connected at the free end.

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