A moving contact structure for preventing breakage and misconnection and an electromagnetic relay

Abstract

The present invention discloses a moving contact structure and an electromagnetic relay that prevent breakage and misconnection. The moving contact structure is used for a relay and includes a moving contact piece, and a moving contact is provided at the head of the moving contact piece. An L-shaped hanging portion for hanging on a pushing card of the relay is provided at the head of the moving contact piece. The L-shaped hanging portion includes a first extending portion extending to one side along the width direction of the moving contact piece, and a second extending portion bent and extending from the tail end of the first extending portion toward the side where one surface of the moving contact piece is located. When the moving contact structure of the present invention is applied to a relay, it not only has the function of forced guidance, but also can firmly hang on the pushing card of the relay by using its L-shaped hanging portion. Therefore, even if the moving contact piece breaks, it will not fall into the base of the relay, thereby avoiding misconnection with the static contact part of the relay and improving the safety of the relay.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and particularly to a moving contact structure and an electromagnetic relay that prevent breakage and misconnection. Background Art

[0002] An electromagnetic relay is an electrically controlled device. Its basic working principle is to convert electrical energy into magnetic energy and then into mechanical energy, and use the mechanical energy to connect and disconnect the controlled circuit to achieve the function of "relaying". An electromagnetic relay in the prior art has a horizontal magnetic circuit part and is connected and cooperated with a moving contact part through a pushing card. Specifically, the pushing card is provided with a limiting groove, and the moving contact part is stuck in the limiting groove. When the pushing card moves forward, the rear groove wall of the limiting groove of the pushing card pushes the moving contact part forward. When the pushing card moves backward, the front groove arm of the limiting groove of the pushing card pushes the moving contact part backward. This relay has the characteristic of forced guidance, and can ensure safety even if the contacts are fused. However, this relay also has the following deficiencies: once the moving contact part breaks, the moving contact part will tilt and fall into the base, and there is a possibility of misconnection with the static contact part, thus affecting the safety of the relay. Summary of the Invention

[0003] The purpose of the present invention is to provide a moving contact structure and an electromagnetic relay that prevent breakage and misconnection in view of the technical problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a moving contact structure that prevents breakage and misconnection, used for a relay, including a moving contact piece, and a moving contact is arranged at the head of the moving contact piece; an L-shaped hanging part for hanging on the pushing card of the relay is arranged at the head of the moving contact piece, and the L-shaped hanging part includes a first extension part extending to one side along the width direction of the moving contact piece, and a second extension part bent and extended from the tail end of the first extension part toward the side where one surface of the moving contact piece is located.

[0005] Further, the number of the L-shaped hanging parts is one, and the second extension part of the L-shaped hanging part and the moving contact are located on opposite sides of the moving contact piece.

[0006] Further, the number of the L-shaped hanging parts is two, and the two L-shaped hanging parts are located on the same side of the moving contact piece, and are distributed up and down, and the second extension parts of the two L-shaped hanging parts are located on opposite sides of the moving contact piece.

[0007] Further, the L-shaped hanging part is provided with a through hole, and the through hole extends from the first extension part to the second extension part.

[0008] Further, a moving contact lead piece is arranged at the tail of the moving contact piece.

[0009] The present invention further provides an electromagnetic relay, comprising a base, and a magnetic circuit part, a movable spring part, and a static spring part arranged on the base, the magnetic circuit part being connected and matched with the movable spring part through a pushing card, and the movable spring part and the static spring part correspondingly match; the movable spring piece of the movable spring part adopts the movable spring piece of the movable spring structure for preventing fracture and misconnection as described in the above-mentioned present invention, the pushing card is provided with a pushing arm, and the pushing arm is provided with a limiting groove with an upward port, the first extension part of the L-shaped hanging part of the movable spring part is hung on the limiting groove of the pushing arm, and the second extension part is matched with the outside of the pushing arm.

[0010] Furthermore, the movable spring part includes a first movable spring part, which has an overtravel relative to the pushing card, and the limiting groove of the pushing card includes a first limiting groove corresponding to the first movable spring part; the inner side surface of the pushing arm is provided with a pushing boss, and the pushing boss and the moving contact are located on two opposite sides of the first movable spring part. In the overtravel stage of the first movable spring part, the force application part of the pushing card on the first movable spring part is changed from the first limiting groove to the pushing boss, and the pushing boss cooperates with the head of the movable spring sheet of the first movable spring part.

[0011] Furthermore, a baffle is provided on the inner side surface of the pushing arm, and the baffle and the moving contact are located on two opposite sides of the first moving spring part, and the pushing boss is arranged on the side of the baffle close to the first moving spring part; and / or, the pushing point of the pushing boss on the head of the moving spring sheet is lower than the pushing point of the first limiting groove on the first extension part.

[0012] Furthermore, the dynamic spring part also includes a second dynamic spring part, which has an idle stroke relative to the pushing card. The second dynamic spring part and the first dynamic spring part are distributed along the pushing direction of the pushing card, and the limiting groove of the pushing card includes a second limiting groove corresponding to the second dynamic spring part.

[0013] Furthermore, a pull-back block is provided on the inner side surface of the push arm, and the pull-back block and the moving contact are located on the same side of the first moving spring part, and the pull-back block contacts the head of the moving spring piece of the first moving spring part.

[0014] Further, the first moving reed part is of normally open type, the second moving reed part is of normally closed type, and the second moving reed part is located between the first moving reed part and the magnetic circuit system; the number of L-shaped hanging parts of the first moving reed part is one, and the second extension part of the L-shaped hanging part and the moving contact are located on opposite sides of the moving reed; the number of L-shaped hanging parts of the second moving reed part is two, and the two L-shaped hanging parts are located on the same side of the moving reed and are distributed vertically, and the second extension parts of the two L-shaped hanging parts are located on opposite sides of the moving reed; and / or, the number of the first moving reed parts, the number of the second moving reed parts, and the number of the pushing arms are each two, and the two first moving reed parts, the two second moving reed parts, and the two pushing arms are respectively distributed along the width direction of the base and are mirror images of each other; the two first moving reed parts and the two second moving reed parts are respectively in one-to-one cooperation with the two pushing arms.

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

[0016] 1. Since the head of the moving reed is provided with an L-shaped hanging part for hanging on the pushing card of the relay, the L-shaped hanging part includes a first extension part extending to one side along the width direction of the moving reed, and a second extension part bent and extended from the tail end of the first extension part toward the side where one surface of the moving reed is located, when the moving reed structure of the present invention is applied to the relay, it not only has the function of forced guidance, but also can firmly hang on the pushing card of the relay by its L-shaped hanging part. Therefore, even if the moving reed breaks, it will not fall into the base of the relay, thus avoiding accidental connection with the static reed part of the relay and improving the safety of the relay. In addition, the whole L-shaped hanging part is located on the side of the moving reed, and has the characteristics of simpler processing technology and more convenient assembly.

[0017] 2. The setting of the pushing boss makes the force-applying part of the pushing card on the first moving reed part change from the first limiting groove to the pushing boss during the over-travel stage of the first moving reed part, and the pushing boss cooperates with the head of the moving reed of the first moving reed part, so that it can avoid the L-shaped hanging part of the first moving reed part during the over-travel stage of the first moving reed part, and prevent the L-shaped hanging part from being deformed or broken due to force, thereby further improving the safety of the relay.

[0018] 3. The setting of the baffle can further provide support and limitation for the moving reed when the moving reed breaks, and prevent its L-shaped hanging part from disengaging from the first hanging groove. The pushing point of the pushing boss on the head of the moving reed is lower than the pushing point of the first limiting groove on the first extension part, realizing the change of the force-applying point of the moving reed part from a high point to a low point during the pushing process of the pushing card, and can achieve a larger displacement distance of the first moving reed part under the condition that the swing amplitude of the armature in the magnetic circuit part is smaller, thereby improving the suction force of the product.

[0019] 4. The setting of the pulling block can increase the contact area between the pushing card and the moving reed, so that when contact adhesion occurs and the coil in the magnetic circuit part is removed from excitation, the pushing card can effectively pull back the head of the moving reed of the first moving reed part to ensure that the normally closed contact gap required for forced guidance is ≥ 0.5 mm, and can avoid the L-shaped hanging part of the first moving reed part, making the deformation of the L-shaped hanging part smaller.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, a moving reed structure and an electromagnetic relay for preventing breakage and misconnection of the present invention are not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is a schematic structural view of the moving reed structure of the first embodiment of the present invention Figure 1 (showing the front);

[0022] Figure 2 is a schematic structural view of the moving reed structure of the first embodiment of the present invention Figure 2 (showing the back);

[0023] Figure 3 is a schematic structural view of the moving reed structure of the second embodiment of the present invention Figure 1 (showing the front);

[0024] Figure 4 is a schematic structural view of the moving reed structure of the second embodiment of the present invention Figure 2 (showing the back);

[0025] Figure 5 is a schematic structural view of the electromagnetic relay of the embodiment of the present invention;

[0026] Figure 6 is a schematic distribution view of two first moving reed parts of the present invention;

[0027] Figure 7 is a schematic distribution view of two second moving reed parts of the present invention;

[0028] Figure 8 is a schematic structural view of the pushing card of the present invention;

[0029] Figure 9 is Figure 8 an enlarged schematic view of part A in

[0030] Figure 10 is a schematic cooperation view of the pushing card of the present invention with two first moving reed parts and second moving reed parts. Detailed Embodiment

[0031] For the first embodiment, please refer to Figure 1 、 Figure 2As shown in the figure, a moving contact spring structure for preventing breakage and misconnection in the present invention is used for a relay, and includes a moving contact spring piece 1, and a moving contact 2 is arranged at the head of the moving contact spring piece 1; an L-shaped hanging portion 11 for hanging on the pushing card of the relay is arranged at the head of the moving contact spring piece 1. The L-shaped hanging portion 11 includes a first extension portion 111 extending to one side (the one side can be any side in the width direction of the moving contact spring piece 1, depending on actual needs) along the width direction of the moving contact spring piece 1, and a second extension portion 112 bent and extended from the tail end of the first extension portion 111 toward the side where one surface of the moving contact spring piece 1 is located.

[0032] In this embodiment, the number of the L-shaped hanging portions 11 is one, and the second extension portion 112 of the L-shaped hanging portion 11 and the moving contact 2 are located on opposite sides of the moving contact spring piece 1. A through hole 113 is arranged on the L-shaped hanging portion 11, and the through hole 113 extends from the first extension portion 111 to the second extension portion 112. The arrangement of the through hole 113 makes the second extension portion 112 of the L-shaped hanging portion 11 more convenient for bending and forming.

[0033] In this embodiment, a moving contact lead piece 3 is arranged at the tail of the moving contact spring piece 1. Specifically, the moving contact lead piece 3 is riveted to the tail of the moving contact spring piece 1, but it is not limited thereto. In other embodiments, the moving contact lead piece and the moving contact spring piece are integrally formed.

[0034] When the moving contact spring structure for preventing breakage and misconnection in the present invention is applied to a relay, its L-shaped hanging portion 11 is hung in the limit groove on the pushing arm of the pushing card. Specifically, the first extension portion 111 of the L-shaped hanging portion 11 is hung in the limit groove of the pushing arm, and the second extension portion 112 is fitted outside the pushing arm. Thus, when the moving contact spring piece 1 breaks, the moving contact spring piece 1 can be firmly hung on the pushing card through its L-shaped hanging portion 11, thereby avoiding the possibility of falling into the base of the relay and being misconnected with the static contact part.

[0035] Embodiment 2

[0036] Please refer to Figure 3 、 Figure 4 As shown in the figure, a moving contact spring structure for preventing breakage and misconnection in the present invention is different from the above Embodiment 1 in that: the number of the L-shaped hanging portions 11 is two, the two L-shaped hanging portions 11 are located on the same side of the moving contact spring piece 1, and are distributed up and down, and the second extension portions 112 of the two L-shaped hanging portions 11 are located on opposite sides of the moving contact spring piece 1.

[0037] Please refer to Figures 5 - 10As shown, an electromagnetic relay of the present invention comprises a base 10, and a magnetic circuit part 20, a dynamic spring part, and a static spring part arranged on the base 10. The magnetic circuit part 20 is connected and matched with the dynamic spring part through a push card 30, and the dynamic spring part and the static spring part are matched accordingly. The dynamic spring part adopts the dynamic spring structure for preventing fracture and misconnection described in the above-mentioned embodiment 1 or embodiment 2, and the push card 30 is provided with a push arm 31, and the push arm 31 is provided with a limit groove with an upward port, and the first extension part 111 of the L-shaped hanging part 11 of the dynamic spring part is hung on the limit groove of the push arm 31, and the second extension part 112 is matched on the outside of the push arm 31.

[0038] In this embodiment, the movable spring part includes a first movable spring part 40, and the first movable spring part 40 has an overtravel relative to the pushing card 30. The limiting groove of the pushing card 30 includes a first limiting groove 311 corresponding to the first movable spring part 40; the inner side surface of the pushing arm 31 is provided with a pushing boss 312, and the pushing boss 312 and the moving contact 2 are located on two opposite sides of the first movable spring part 40. In the overtravel stage of the first movable spring part 40, the force application part of the pushing card 30 on the first movable spring part 40 is changed from the first limiting groove 311 to the pushing boss 312, and the pushing boss 312 cooperates with the head of the movable spring sheet 1 of the first movable spring part 40.

[0039] In this embodiment, a baffle 313 is provided on the inner side of the push arm 31, and the baffle 313 and the movable contact 2 are located on two opposite sides of the first movable spring portion 40, and the push boss 312 is provided on a side of the baffle 313 close to the first movable spring portion 40. The push point of the push boss 312 on the head of the movable spring piece 1 is lower than the push point of the first limiting groove 311 on the first extension portion 111.

[0040] In this embodiment, the movable spring part also includes a second movable spring part 50, and the second movable spring part 50 has an idle stroke relative to the push card 30. The second movable spring part 50 and the first movable spring part 40 are distributed along the pushing direction of the push card 30, and the limiting groove of the push card 30 includes a second limiting groove 315 corresponding to the second movable spring part 50. The first movable spring part 40 is a normally open type, and the second movable spring part 50 is a normally closed type. The second movable spring part 50 is located between the first movable spring part 40 and the magnetic circuit system. Similarly, the static spring part includes a first static spring part 60 corresponding to the first movable spring part 40 and a second static spring part 70 corresponding to the second movable spring part 50.

[0041] In this embodiment, a pull-back block 314 is provided on the inner side of the push arm 31 . The pull-back block 314 and the movable contact 2 are located on the same side of the first movable spring portion 40 . The pull-back block 314 contacts the head of the movable spring piece 1 of the first movable spring portion 40 .

[0042] In this embodiment, the number of the L-shaped hanging parts 11 of the first moving spring part 40 is one. The second extension part 112 of the L-shaped hanging part 11 and the moving contact 2 are located on opposite sides of the moving spring piece 1. That is, the first moving spring part 40 adopts the moving spring structure for preventing breakage and misconnection described in the first embodiment above. The number of the L-shaped hanging parts 11 of the second moving spring part 50 is two. The two L-shaped hanging parts 11 are located on the same side of the moving spring piece 1 and are distributed vertically. And the second extension parts 112 of the two L-shaped hanging parts 11 are located on opposite sides of the moving spring piece 1. That is, the second moving spring part 50 adopts the moving spring structure for preventing breakage and misconnection described in the second embodiment above.

[0043] In this embodiment, the numbers of the first moving spring part 40, the second moving spring part 50, the pushing arm 31, the first static spring part 60, and the second static spring part 70 are all two. The two first moving spring parts 40, the two second moving spring parts 50, the two pushing arms 31, the two first static spring parts 60, and the two second static spring parts 70 are respectively distributed along the width direction of the base 10 and are mirror images of each other. The two first moving spring parts 40 and the two second moving spring parts 50 are respectively in one-to-one cooperation with the two pushing arms 31.

[0044] In this embodiment, a first support boss 316 is provided on the outer side surface of the pushing arm 31 near the first limiting groove 311 for supporting the second extension part 112 of the first moving spring part 40. Two second support bosses 317 are provided on the outer side surface of the pushing arm 31 near the second limiting groove 315. The two second support bosses 317 are distributed along the pushing direction of the pushing card 30 and are arranged in a one-high-one-low manner, respectively for supporting the two second extension parts 112 of the second moving spring part 50.

[0045] An electromagnetic relay of the present invention, the L-shaped hanging portions 11 of the two first moving spring parts 40 are respectively hung and matched with the first limiting grooves 311 of the two pushing arms 31 of the pushing card 30, and the L-shaped hanging portions 11 of the two second moving spring parts 50 are respectively hung and matched with the second limiting grooves 315 of the two pushing arms 31 of the pushing card 30, which not only realizes the function of forced guiding, but also has the function of preventing the moving spring pieces 1 of the first moving spring part 40 and the second moving spring part 50 from being accidentally connected due to fracture caused by uncertain factors. That is, when the moving spring piece 1 breaks, the moving spring piece 1 can be reliably hung on the pushing card 30 and will not move randomly inside the relay to cause accidental connection. The pulling-back block 314 at the head of the pushing card 30 increases the contact area with the moving spring piece 1. Thus, when the moving contact (this is a normally open contact) of the first moving spring part 40 is adhered and the coil of the magnetic circuit part is removed from excitation, the pushing card 30 can effectively pull back the head of the moving spring piece 1 to ensure that the normally closed contact gap required for forced guiding (that is, the gap between the moving contact of the second moving spring part 50 and its corresponding static contact) ≥ 0.5 mm, and can avoid the L-shaped hanging portion 11 of the first moving spring part 40, making the deformation of the L-shaped hanging portion 11 smaller.

[0046] During operation, the pushing card 30 is affected by the magnetic circuit part 20. One groove wall of the first limiting groove 311 of the pushing card 30 pushes the first extension part 111 of the first moving spring part 40, thereby driving the first moving spring part 40 to move towards the first static spring part 60. One groove wall of the second limiting groove 315 of the pushing card 30 pushes the first extension part 111 of the second moving spring part 50, thereby driving the second moving spring part 50 to move away from the second static spring part 70. During the over-travel stage of the first moving spring part 40, the force-applying part of the pushing card 30 on the first moving spring part 40 changes from the first limiting groove 311 to the pushing boss 312. That is, during the over-travel stage of the first moving spring part 40, the pushing boss 312 pushes the head of the moving spring piece 1 of the first moving spring part 40, causing the moving spring piece 1 to deform, thereby realizing the over-travel. During this process, the L-shaped hanging portion 11 of the first moving spring part 40 is not affected by the pushing card 30, avoiding obvious deformation or fracture of the L-shaped hanging portion 11 due to force. During the over-travel stage of the first moving spring part 40, the force-applying point of the first moving spring part 40 changes from a high position point to a low position point, and a relatively large displacement distance of the first moving spring part 40 can be realized under the condition that the swing amplitude of the armature of the magnetic circuit part 20 is small, thereby improving the suction force of the product.

[0047] In other embodiments, an electromagnetic relay of the present invention, its moving spring part only includes a normally closed moving spring part or a normally open moving spring part, and its moving spring part adopts the moving spring structure for preventing fracture and accidental connection of the present invention described in the above-mentioned Embodiment 1 or Embodiment 2.

[0048] The above embodiments are only used to further illustrate a moving contact structure and an electromagnetic relay for preventing breakage and misconnection of the present invention. However, 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. A moving contact structure for preventing breakage and misconnection, used in a relay, includes a moving contact piece, and a moving contact is arranged at the head of the moving contact piece; it is characterized in that: The head of the moving reed is provided with an L-shaped hanging portion for hanging on the pushing card of the relay. The L-shaped hanging portion includes a first extension portion extending to one side along the width direction of the moving reed, and a second extension portion bent and extended from the tail end of the first extension portion toward the side where one surface of the moving reed is located; a limiting groove is provided on the pushing card, the first extension portion of the L-shaped hanging portion is hung on the limiting groove, and the second extension portion is fitted outside the pushing card.

2. The moving contact spring structure for preventing breakage and misconnection according to claim 1, characterized in that: The number of the L-shaped hanging portions is one, and the second extension portion of the L-shaped hanging portion and the moving contact are located on opposite sides of the moving reed.

3. The moving contact spring structure for preventing breakage and misconnection according to claim 1, characterized in that: The number of the L-shaped hanging portions is two, and the two L-shaped hanging portions are located on the same side of the moving reed and are distributed up and down, and the second extension portions of the two L-shaped hanging portions are located on opposite sides of the moving reed.

4. The moving contact structure for preventing breakage and misconnection according to claim 1 or 2 or 3, characterized in that: The L-shaped hanging portion is provided with a through hole, and the through hole extends from the first extension portion to the second extension portion.

5. The moving contact structure for preventing breakage and misconnection according to claim 1, characterized in that: A moving reed lead piece is arranged at the tail of the moving reed.

6. An electromagnetic relay, comprising a base, and a magnetic circuit part, a moving contact part, and a static contact part provided on the base, the magnetic circuit part is connected and cooperated with the moving contact part through a pushing card, and the moving contact part is correspondingly cooperated with the static contact part; characterized in that: The moving reed of the moving reed part adopts the moving reed of the anti-fracture misconnection moving reed structure as described in any one of claims 1-5. The pushing card is provided with a pushing arm, and a limiting groove with an upward port is arranged on the pushing arm. The first extension portion of the L-shaped hanging portion of the moving reed part is hung on the limiting groove of the pushing arm, and the second extension portion is fitted outside the pushing arm.

7. The electromagnetic relay according to claim 6, characterized in that: The moving reed part includes a first moving reed part, and the first moving reed part has an overtravel relative to the pushing card. The limiting groove of the pushing card includes a first limiting groove corresponding to and cooperating with the first moving reed part; a pushing boss is arranged on the inner side surface of the pushing arm, and the pushing boss and the moving contact are located on opposite sides of the first moving reed part. In the overtravel stage of the first moving reed part, the force application position of the pushing card on the first moving reed part changes from the first limiting groove to the pushing boss, and the pushing boss cooperates with the head of the moving reed of the first moving reed part.

8. The electromagnetic relay according to claim 7, characterized in that: A baffle is arranged on the inner side surface of the pushing arm, and the baffle and the moving contact are located on opposite sides of the first moving reed part. The pushing boss is arranged on the side of the baffle close to the first moving reed part; and / or, the pushing point of the pushing boss on the head of the moving reed is lower than the pushing point of the first limiting groove on the first extension portion.

9. The electromagnetic relay according to claim 7, wherein: The moving reed part further includes a second moving reed part, and the second moving reed part has a dead travel relative to the pushing card. The second moving reed part and the first moving reed part are distributed along the pushing direction of the pushing card. The limiting groove of the pushing card includes a second limiting groove corresponding to and cooperating with the second moving reed part.

10. The electromagnetic relay according to claim 9, wherein: A pulling-back block is arranged on the inner side surface of the pushing arm, and the pulling-back block and the moving contact are located on the same side of the first moving reed part. The pulling-back block abuts against the head of the moving reed of the first moving reed part.

11. The electromagnetic relay according to claim 9, wherein: The first moving spring part is of normally open type, the second moving spring part is of normally closed type, and the second moving spring part is located between the first moving spring part and the magnetic circuit system; the number of L-shaped hanging parts of the first moving spring part is one, and the second extension part of the L-shaped hanging part and the moving contact are located on opposite sides of the moving spring piece; the number of L-shaped hanging parts of the second moving spring part is two, and the two L-shaped hanging parts are located on the same side of the moving spring piece and are distributed vertically, and the second extension parts of the two L-shaped hanging parts are located on opposite sides of the moving spring piece; and / or, the numbers of the first moving spring parts, the second moving spring parts, and the pushing arms are two respectively, and the two first moving spring parts, the two second moving spring parts, and the two pushing arms are distributed along the width direction of the base and are mirror images of each other; the two first moving spring parts and the two second moving spring parts are respectively in one-to-one cooperation with the two pushing arms.

Images