An electromagnetic relay for improving the contact breaking capacity

Abstract

The present invention discloses an electromagnetic relay for improving the breaking capacity of contacts, which includes a base, a push card, and a magnetic circuit system and a contact system provided on the base. The contact system includes a moving spring provided with a moving contact and a static spring provided with a static contact. One end of the push card is connected to the moving spring, and the other end of the push card is connected to the armature of the magnetic circuit system. It further includes an auxiliary elastic piece, which is arranged on the static spring. When the moving contact is in contact with the static contact, one end of the push card presses against the auxiliary elastic piece. The arrangement of the auxiliary elastic piece enables the auxiliary elastic piece to apply an elastic piece reaction force in the same direction as the reaction force of the moving spring to the push card when the moving spring is released. The elastic piece reaction force acts on the moving spring through the push card, so that the moving spring can quickly reset under the superposition of its own reaction force and the elastic piece reaction force, thereby improving the breaking capacity of the contacts and avoiding adhesion between the contacts.

Description

Technical Field

[0001] The invention relates to an electromagnetic relay, in particular to an electromagnetic relay with improved contact breaking capacity. Background Art

[0002] As a low-voltage electrical component, electromagnetic relays have been widely used in various industries. Its working principle is to convert electrical energy into magnetic energy and then into mechanical energy, and use mechanical energy to connect and disconnect the controlled circuit to realize the role of "relay".

[0003] In the traditional relay design, its contact system includes a moving spring with a moving contact and a static spring with a static contact. When the armature of the magnetic circuit system is attracted by the iron core, the armature drives the push card to move, and the push card drives the moving spring to move, so that the moving contact contacts the static contact, and the contact is closed. When the attraction to the armature disappears, the moving spring relies on its own reaction force (i.e., elastic restoring force) to reset and let the moving contact leave the static contact, so that the contact is disconnected. Since the reaction force is very large when the contact is closed, in order to match the suction reaction force, it is generally achieved by increasing the flexibility of the moving spring, but at the same time it also causes the anti-adhesion ability of the moving spring to be insufficient, and the breaking force is insufficient, thereby affecting the performance indicators of the relay. In order to solve this problem, the prior art generally improves the breaking force of the moving spring by improving the structure of the moving spring. However, this method not only has a high R&D cost, but also brings inconvenience to the assembly and operation of the moving spring. Summary of the invention

[0004] The purpose of the present invention is to provide an electromagnetic relay with improved contact breaking capacity in view of the technical problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an electromagnetic relay for improving the contact breaking capacity, including a base, a push card, and a magnetic circuit system and a contact system arranged on the base, the contact system including a moving spring provided with a moving contact and a static spring provided with a static contact, one end of the push card is connected to the moving spring, and the other end of the push card is connected to the armature of the magnetic circuit system; it is characterized in that: it also includes an auxiliary spring, which is arranged on the static spring, and when the moving contact is in contact with the static contact, one end of the push card is pressed against the auxiliary spring.

[0006] Furthermore, the auxiliary spring piece has left and right wings, and one end of the push card includes two parallel first connecting arms, the two first connecting arms are connected to the dynamic spring, and the two first connecting arms are respectively pressed against the two wings of the auxiliary spring piece when the dynamic contact is in contact with the static contact.

[0007] Furthermore, the top ends of the two wings of the auxiliary elastic piece are respectively provided with limiting pieces, and the limiting pieces on the two wings are respectively matched one by one on the upper sides of the two first connecting arms to limit the push card from escaping upwards.

[0008] Further, U-shaped card slots with openings facing downward are respectively provided on the bottom surfaces of the two first connecting arms, and the U-shaped card slots of the two first connecting arms respectively clamp the left and right ends of the top of the moving spring.

[0009] Further, the auxiliary spring piece is riveted on the static spring, and the riveting point of the auxiliary spring piece is consistent with the riveting point of the static contact.

[0010] Further, a limiting convex arm is further included. The limiting convex arm and the static spring are located on two opposite sides of the moving spring, and the limiting convex arm supports the moving spring during the reset process of the moving spring.

[0011] Further, the contact point between the limiting convex arm and the moving spring faces away from the moving contact.

[0012] Further, a moving spring lead-out piece is connected to the moving spring, and the limiting convex arm is arranged on the moving spring lead-out piece.

[0013] Further, the limiting convex arm and the moving spring lead-out piece are integrally formed, and the limiting convex arm is in an inclined state.

[0014] Further, the other end of the pushing card includes two second connecting arms arranged in parallel and a limiting arm located between the two second connecting arms. Limiting flanges are respectively provided at the tail ends of the two second connecting arms. A limiting notch is respectively provided at the top of the left and right side walls of the armature. The two second connecting arms respectively pass through the two limiting notches of the armature, and the limiting flanges are fitted on the outside of the armature, and the limiting arm is fitted on the inside of the armature.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The setting of the auxiliary spring piece enables the auxiliary spring piece to apply a spring piece reaction force in the same direction as the reaction force of the moving spring to the pushing card when the moving spring is released. The spring piece reaction force acts on the moving spring through the pushing card, so that the moving spring can be quickly reset under the superposition of its own reaction force and the spring piece reaction force, thereby improving the contact breaking ability and avoiding adhesion between contacts. Moreover, the auxiliary spring piece is arranged on the static spring and has nothing to do with the moving spring, and will not cause inconvenience to the assembly or movement of the moving spring. Moreover, the moving spring only needs to meet the flexibility requirement, and there is no need to make a structural improvement to improve the breaking force, so that the structure of the moving spring is simpler and the cost is lower.

[0017] 2. The auxiliary spring piece has left and right wing pieces, which cooperate with the two first connecting arms at one end of the pushing card, so that the pushing card is uniformly stressed and the overall movement coordination is good.

[0018] 3. The setting of the limiting piece can prevent the pushing card from disengaging upward.

[0019] 4. The bottom surfaces of the two first connecting arms are respectively provided with U-shaped card slots opening downward, and the U-shaped card slots of the two first connecting arms respectively clamp the left and right ends of the top of the moving spring. This not only makes the connection structure between the moving spring and the pushing card very simple and the assembly very convenient, but also does not affect the moving spring being pulled by the reaction force of the auxiliary elastic sheet along the reset direction under the action of the auxiliary elastic sheet.

[0020] 5. The auxiliary elastic sheet is riveted on the static spring, and the riveting point of the auxiliary elastic sheet is the same as that of the static contact point, making the installation of the auxiliary elastic sheet very convenient and not adding additional installation procedures.

[0021] 6. The setting of the limiting convex arm can support the moving spring during the reset process of the moving spring, prevent the moving spring from swinging too much during reset and rebounding, thereby avoiding the risk of secondary connection after the contact is disconnected.

[0022] The present invention will be further described in detail below in conjunction with the drawings and embodiments; however, an electromagnetic relay for improving the contact breaking ability of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded schematic view of the present invention;

[0024] Figure 2 is a three-dimensional structure schematic view (excluding the housing) of the present invention;

[0025] Figure 3 is a structural schematic view of the auxiliary elastic sheet of the present invention;

[0026] Figure 4 is a structural schematic view of the pushing card of the present invention;

[0027] Figure 5 is a schematic view of the installation position of the auxiliary elastic sheet of the present invention;

[0028] Figure 6 is a schematic view of the cooperation between the auxiliary elastic sheet and the pushing card of the present invention;

[0029] Figure 7 is a structural schematic view of the cooperation between the limiting convex arm, the moving spring and the moving spring lead-out piece of the present invention;

[0030] Figure 8 is a structural schematic view of the coil holder of the present invention;

[0031] Figure 9 is a structural schematic of the armature of the present invention Figure 1 ;

[0032] Figure 10 is a structural schematic of the armature of the present invention Figure 2 ;

[0033] Figure 11 It is a structural schematic diagram of the base of the present invention;

[0034] Figure 12 Schematic diagram of the assembly of the armature of the present invention Figure 1 ;

[0035] Figure 13 Schematic diagram of the assembly of the armature of the present invention Figure 2 . DETAILED DESCRIPTION

[0036] For examples, see Figures 1 - 13 As shown, an electromagnetic relay for improving the breaking capacity of contacts of the present invention comprises a base 6, a push card 10, a housing 20, and a magnetic circuit system and a contact system arranged on the base 6. The magnetic circuit system comprises a coil frame 3 wound with an enameled wire 4, an iron core 2, a yoke 5, and an armature 1. The iron core 2 is inserted into the coil frame 3, and one end of the iron core 2 is connected to one end of the yoke 5; the armature 1 can stand swingably at the other end of the iron core 2. The "standing" means that the armature 1 is not in a lying state when released, and it can be a vertical upright state, or it can be inclined at a certain angle and close to an upright state. The contact system comprises a moving spring 7 provided with a moving contact 71, and a static spring 8 provided with a static contact 81. One end of the push card 10 is connected to the moving spring 7, and the other end of the push card 10 is connected to the armature 1. The present invention further includes an auxiliary spring 9, which is arranged on the static spring 7. When the moving contact 71 is in contact with the static contact 81, one end of the push card 10 is pressed against the auxiliary spring 9, so that when the dynamic spring 7 is released, the push card 10 is pulled in the direction of the dynamic spring 7 to return to the original position by the spring reaction force of the auxiliary spring 9. The bottom end of the housing 20 is open, and the housing 20 encloses the contact system, the magnetic circuit system, the base 6, etc.

[0037] In this embodiment, Figure 5 As shown, the auxiliary spring 9 is riveted to the static spring 8, and the riveting point of the auxiliary spring 9 is consistent with the riveting point of the static contact, that is, when the static spring 8 is riveted to the static contact 81, the auxiliary spring 9 is riveted to the static spring 8 together with the static contact 81. In other embodiments, the auxiliary spring is arranged on the base. When the moving contact 71 is in contact with the static contact 81, one end of the push card 10 is pressed against the auxiliary spring 9. The auxiliary spring 9 is provided with a limit plate 92, which is matched on the other end of the push card 10 to limit the push card 10 from slipping out upward.

[0038] In this embodiment, Figure 4As shown in the figure, one end of the pushing card 10 includes two first connecting arms 101 arranged in parallel. The two first connecting arms 101 are respectively connected to the moving spring 7. When the moving contact 71 is in contact with the static contact 81, the tails of the two first connecting arms 101 are respectively pressed against the auxiliary elastic sheet 9. Specifically, U-shaped grooves 1011 with openings facing down are respectively provided on the bottom surfaces of the two first connecting arms 101. The U-shaped grooves 1011 of the two first connecting arms respectively clamp the left and right ends of the top of the moving spring 7. In this way, not only is the connection structure between the moving spring 7 and the pushing card 10 very simple and the assembly is very convenient, but it also does not affect the pushing card 10 being pulled by the elastic reaction force of the auxiliary elastic sheet 9 to drive the moving spring 7 to move in the reset direction. As Figure 3 shown, the auxiliary elastic sheet 9 has left and right wing pieces 91. The two wing pieces 91 are respectively located on the left and right sides of the static spring 8. When the moving contact 71 is in contact with the static contact 81, the tail end surfaces 1012 of the two first connecting arms 101 are respectively pressed against the two wing pieces 91 one by one. The number of the limiting pieces 92 is two, and the two limiting pieces 92 are respectively arranged at the tops of the two wing pieces 91, and the two limiting pieces 92 are respectively fitted above the tails of the two first connecting arms 101 of the pushing card 10, as Figure 6 shown. Specifically, the two limiting pieces 92 are respectively bent from the tops of the two wing pieces 91 of the auxiliary elastic sheet 9 toward the side of the pushing card 10. The other end of the pushing card 10 includes two second connecting arms 102 arranged in parallel and several limiting arms 103 located between the two connecting arms 102. Limiting flanges 1021 are respectively provided at the tails of the two second connecting arms 102. One limiting notch 14 is respectively provided at the top of the left and right side walls of the armature 1. The two second connecting arms 102 respectively pass through the two limiting notches 14 of the armature, and the limiting flanges 1021 are fitted outside the armature 1, and the limiting arms 103 are fitted inside the armature 1.

[0039] In this embodiment, as Figure 7 shown, the present invention further includes a limiting convex arm 721. The limiting convex arm 721 and the static spring 8 are located on the opposite sides of the moving spring 7. And the limiting convex arm 721 supports the moving spring 7 during the reset process of the moving spring 7 to prevent the moving spring 7 from swinging too much during reset and rebounding, thereby avoiding the risk of secondary connection after the contact is disconnected. The contact point between the limiting convex arm 721 and the moving spring 7 is opposite to the moving contact 71.

[0040] In this embodiment, the moving spring 7 is connected with a moving spring lead-out piece 72. The limiting convex arm 721 is obliquely arranged on the moving spring lead-out piece 72. Specifically, the limiting convex arm 721 is formed by cutting a part of the structure of the moving spring lead-out piece 72 and then bending it downward. The moving spring lead-out piece 72 is specifically a QC lead-out piece, that is, a quick-connection lead-out piece. A static spring lead-out piece 82 is also integrally formed on the static spring 8, and the static spring lead-out piece 82 is also a QC lead-out piece.

[0041] In this embodiment, the armature 1 and the bobbin 3 are provided with a first limiting structure to limit the axial outward movement of the armature 1 along the bobbin 3; the armature 1 and the other end of the yoke 5 are provided with a second limiting structure to limit the upward movement of the armature 1; the armature 1 and the base 6 are provided with a third limiting structure to limit the downward movement of the armature 1; one end of the push card 10 is connected to the moving reed 7, and the other end is connected to the armature 1, and the push card 10 can drive the armature 1 to reset under the action of the reaction force of the moving reed 7.

[0042] In this embodiment, as Figure 8 shown, two extension blocks 31 located on the left and right sides of the armature 1 are provided at one end of the bobbin 3. The first limiting structure includes a limiting boss 311 respectively arranged on the relative inner side surfaces of the two extension blocks 31, and a relief notch 11 respectively arranged at the bottom of the left and right side walls of the armature 1. As Figure 9 shown, after each limiting boss 311 passes through the corresponding relief notch 11, it forms a limit on the armature 1 by being staggered with the relief notch 11 in the height direction. The second limiting structure includes a limiting convex block 12 provided at the bottom end of the armature 1 facing the other end of the yoke 5, and the limiting convex block 12 abuts against the lower surface of the other end of the yoke 5. The third limiting structure includes a support boss 61 provided on the base 6 (as Figure 11 shown), and a mating surface 13 provided at the bottom of the armature 1 (as Figure 10 shown), and the mating surface 13 abuts against the support boss 61, as Figure 13 shown. The number of the support bosses 61 is two, and the two support bosses 61 are arranged side by side along the width direction of the base 6. The number of the mating surfaces 13 is two, corresponding to the two support bosses 61 one by one. The top surface of the support boss 61 is provided with a guiding inclined surface 611, and the mating surface 13 abuts against the guiding inclined surface 611. The mating surface 13 is a plane. The limiting convex block 12 is located between the relative inner sides of the two mating surfaces 13, and the limiting convex block 12 is lower than the two mating surfaces 13.

[0043] When assembling the armature 1, for the convenience of assembly, the coil part composed of the iron core 2, the bobbin 3, and the yoke 5 and the armature 1 are all inverted, as Figure 12 shown. Then, after aligning the two relief notches 11 of the armature 1 with the two limiting bosses 311 on the bobbin 3, the armature 1 is pushed into the two extension blocks 31 of the bobbin 3 along the a direction, so that the two limiting bosses 311 respectively pass through the two relief notches 11; then, the armature 1 is pulled along the b direction, so that the two limiting bosses 311 are staggered with the two relief notches 11 in the height direction, and the limiting convex block 12 on the armature 1 is hooked on the other end of the yoke 5. Finally, the magnetic circuit system composed of the armature 1, the bobbin 3, the yoke 5, and the iron core 2 is installed in the base 6, so that the two mating surfaces 13 at the bottom of the armature 1 respectively abut against the guiding inclined surfaces 611 of the two support bosses 61 on the base 6, as Figure 13As shown in the figure. In this way, the assembly process of the armature 1 is completed. At this time, even without the compression spring or the restoring reed to protect it, the armature 1 will not fall out, thus realizing the design of the magnetic circuit system without the compression spring structure, and thus the assembly process of the compression spring or the restoring reed can be omitted, achieving the effect of cost saving and improving the overall cost performance of the relay.

[0044] For an electromagnetic relay for improving the contact breaking ability according to the present invention, during operation, when the armature 1 is attracted by the iron core 2 and swings towards the side where the iron core 2 is located, the armature 1 drives the moving spring 7 to move by pushing the pusher 10, so that the moving contact 71 of the moving spring 7 is closed with the static contact 81 of the static spring 8. At the same time, the end faces 1012 of the two first connecting arms 101 of the pusher 10 respectively press against the two wings 91 of the auxiliary spring piece 9, so that the auxiliary spring piece 9 stores energy. When the suction force of the iron core 2 on the armature 1 disappears, the auxiliary spring piece 9 releases energy, and the spring reaction force of the auxiliary spring piece 9 acts on the pusher 10, so that the pusher 10 pulls the moving spring 7 along the direction of resetting of the moving spring 7, so that the moving spring 7 quickly resets under its own reaction force and the pulling of the pusher 10, thereby improving the contact breaking ability and avoiding adhesion between the contacts. During this process, the pusher 10 is pushed by the reaction force of the auxiliary spring piece 9 and the reaction force of the moving spring 7 to quickly reset the armature 1. When the moving spring 7 moves a certain distance along the reset direction, the moving spring 7 is supported by the limiting convex arm 721 to prevent the moving spring 7 from swinging too much and rebounding, thereby avoiding the risk of secondary connection after the contact is disconnected.

[0045] For an electromagnetic relay for improving the contact breaking ability according to the present invention, the parts not involved are the same as or can be implemented by the prior art.

[0046] The above embodiments are only used to further illustrate an electromagnetic relay for improving the contact breaking ability according to the present invention, but the present invention is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay for improving the breaking capacity of contacts, comprising a base, a push card, and a magnetic circuit system and a contact system arranged on the base, wherein the contact system comprises a moving spring provided with a moving contact and a static spring provided with a static contact, one end of the push card is connected to the moving spring, and the other end of the push card is connected to the armature of the magnetic circuit system; Features: It also includes an auxiliary spring sheet, which is arranged on the static spring. When the moving contact is in contact with the static contact, one end of the push card is pressed against the auxiliary spring sheet; the auxiliary spring sheet has two wings, and one end of the push card includes two first connecting arms in parallel. The two first connecting arms are respectively pressed against the two wings of the auxiliary spring sheet when the moving contact is in contact with the static contact.

2. The electromagnetic relay with improved contact breaking capacity according to claim 1, Features: The two wings of the auxiliary spring are distributed on the left and right, and the two first connecting arms are connected to the dynamic spring.

3. The electromagnetic relay with improved contact breaking capacity according to claim 2, Features: The top ends of the two wings of the auxiliary elastic piece are respectively provided with limiting pieces, and the limiting pieces on the two wings are respectively matched one by one with the upper sides of the two first connecting arms to limit the push card from escaping upwards.

4. The electromagnetic relay with improved contact breaking capacity according to claim 2 or 3, Features: The bottom surfaces of the two first connecting arms are respectively provided with U-shaped clamping grooves with openings facing downwards, and the U-shaped clamping grooves of the two first connecting arms clamp the left and right ends of the top of the movable spring respectively.

5. The electromagnetic relay with improved contact breaking capacity according to any one of claims 1 to 3, Features: The auxiliary spring piece is riveted to the static spring, and the riveting point of the auxiliary spring piece is consistent with the riveting point of the static contact.

6. The electromagnetic relay with improved contact breaking capacity according to claim 1, Features: It also includes a limiting convex arm, which is located on two opposite sides of the dynamic spring with the static spring, and the limiting convex arm supports the dynamic spring during the resetting process of the dynamic spring.

7. The electromagnetic relay with improved contact breaking capacity according to claim 6, Features: The contact point between the limiting protrusion and the movable spring is opposite to the movable contact point.

8. The electromagnetic relay with improved contact breaking capacity according to claim 6, Features: The movable spring is connected with a movable spring lead-out piece, and the limiting protrusion is arranged on the movable spring lead-out piece.

9. The electromagnetic relay with improved contact breaking capacity according to claim 8, Features: The limiting protrusion and the movable spring lead-out piece are integrally formed, and the limiting protrusion is in an inclined state.

10. The electromagnetic relay with improved contact breaking capacity according to claim 1, Features: The other end of the pushing card includes two parallel second connecting arms and a limiting arm located between the two second connecting arms. The tail ends of the two second connecting arms are respectively provided with limiting flanges. The tops of the left and right side walls of the armature are respectively provided with a limiting notch. The two second connecting arms pass through the two limiting notches of the armature one by one, and the limiting flanges are matched with the outside of the armature, and the limiting arms are matched with the inside of the armature.

Images