An electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, including base, contact part and permanent magnet, contact part includes the static spring part of installation in base to and the dynamic spring part of cooperation with static spring part, permanent magnet is located contact part outside, and can guide the electric arc of contact part break and produce to the preset direction, base is equipped with the recess of avoidance on the movement path of electric arc, to provide the avoidance space for electric arc when electric arc produces, the utility model discloses utilize the recess of avoidance to provide the avoidance space for electric arc, greatly reduced the ablation degree of electric arc to base, reduced the failure and failure risk of the trouble of the insulation performance decline of base because of the ablation of electric arc, ensured the stability and reliability of relay in long -term operation.

Description

Technical Field

[0001] This utility model relates to the electrical field, and in particular to an electromagnetic relay. Background Technology

[0002] In high-power DC applications such as photovoltaic power generation and charging piles, relays play a crucial role in on / off control. As system power levels continue to increase, traditional arc-extinguishing methods relying on natural contact disconnection are no longer sufficient. To address this, the industry commonly employs magnetic blowout arc-extinguishing technology. This involves placing permanent magnets outside the contacts, utilizing the electromagnetic force of the magnetic field on the arc plasma to rapidly elongate the arc and move it away from the contact area, thus achieving effective arc extinguishing. However, with the continued miniaturization of relays and the shrinking spacing between load terminals, the arc driven by the magnetic field can easily approach the load terminals during its extension. This causes continuous erosion of the relay's insulating base, leading to a decrease in insulation performance between the load terminals. Ultimately, the arc cannot be reliably extinguished, resulting in serious problems such as contact burnout and product failure. Therefore, there is an urgent need to further improve the existing relay structure to meet both miniaturization and arc-extinguishing requirements. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing an electromagnetic relay that, through structural improvements, can greatly reduce the degree of arc erosion on the insulating base.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an electromagnetic relay, including a base, a contact part and a permanent magnet. The contact part includes a stationary spring part installed on the base and a moving spring part that cooperates with the stationary spring part. The permanent magnet is located outside the contact part and is used to guide the electric arc generated by the contact part. The base is provided with a clearance groove on the movement path of the electric arc to provide clearance space for the electric arc when it is generated.

[0005] In a preferred embodiment, the clearance groove is a through groove structure that runs along the movement path of the electric arc.

[0006] In a preferred embodiment, the base includes a bottom wall and two opposing side walls, the side walls being respectively disposed on the bottom wall and extending upward; the contact portion is located between the two side walls, and the dividing direction of the contact portion is perpendicular to the arrangement direction of the side walls; at least one side wall is equipped with the permanent magnet, and the magnetic pole direction of the permanent magnet is consistent with the arrangement direction of the side walls; the side wall where the permanent magnet is located is provided with the clearance groove.

[0007] In a preferred embodiment, permanent magnets are respectively installed on the two side walls, and the permanent magnets on one side wall and the permanent magnets on the other side wall have opposite magnetic poles facing each other; the moving spring portion is provided with at least two moving contacts arranged in parallel along the arrangement direction of the two side walls, and the stationary spring portion is provided with a stationary contact corresponding to each moving contact.

[0008] In a preferred embodiment, the clearance groove is located below the permanent magnet, and the movement path of the electric arc is downward and turns toward the clearance groove.

[0009] In a preferred embodiment, the outer side of the sidewall where the permanent magnet is located is provided with a mounting groove, and the permanent magnet is mounted in the mounting groove; it also includes a magnetic shielding sheet corresponding to the permanent magnet, which is mounted in the mounting groove and covers the permanent magnet to provide external magnetic shielding.

[0010] In a preferred embodiment, the bottom wall is provided with a first mounting hole for mounting the stationary spring portion and a second mounting hole for mounting the moving spring portion. An insulating isolation structure is provided between the first mounting hole and the second mounting hole on the bottom wall to increase the creepage distance between the stationary spring portion and the moving spring portion.

[0011] In a preferred embodiment, the insulating isolation structure includes a plurality of isolation grooves distributed along the arrangement direction of the stationary spring portion and the moving spring portion, with adjacent isolation grooves separated by a partition portion.

[0012] In a preferred embodiment, the partition is an integrally formed retaining wall or retaining rib on the bottom wall; the isolation groove is a blind groove.

[0013] In a preferred embodiment, the movable spring portion includes a flexible movable spring sheet, a movable spring lead-out sheet, and a movable contact. The movable spring lead-out sheet is installed in the second mounting hole, and the upper end of the movable spring sheet is fixedly connected to the upper end of the movable spring lead-out sheet. The movable contact is disposed on the movable spring sheet. The portion also includes a magnetic circuit portion and a pusher. The magnetic circuit portion is disposed on the base, and the armature portion of the magnetic circuit portion is connected to the movable spring sheet through the pusher.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Because the base of this utility model has a relief groove on the movement path of the electric arc, it can provide relief space for the electric arc when it is generated. This greatly reduces the degree of erosion of the base by the electric arc, reduces the risk of failure and malfunction caused by the decrease in insulation performance of the base due to the electric arc erosion, and ensures the stability and reliability of the relay in long-term operation.

[0016] 2. The clearance groove is a through groove structure that runs along the movement path of the electric arc. It can optimize the arc expansion path, significantly enhance the arc stretching effect, accelerate plasma cooling, and thus improve the arc extinguishing performance and the reliability of the product operation.

[0017] 3. An insulating isolation structure is provided between the first mounting hole and the second mounting hole on the bottom wall of the base, which can increase the creepage distance of the stationary spring part and the moving spring part, thereby improving the arc extinguishing effect.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0019] Figure 1 This is an exploded view of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the base of this utility model;

[0021] Figure 3 This is a front view of the base of this utility model;

[0022] Figure 4 This is a top view of the base of this utility model;

[0023] Figure 5 yes Figure 4 LL section view;

[0024] Figure 6 This is a three-dimensional structural schematic diagram of the present invention (excluding the outer shell);

[0025] Figure 7 This is a top view of the present invention (excluding the outer casing);

[0026] Figure 8 yes Figure 7 MM section view;

[0027] Figure 9 This is a longitudinal sectional view of the base in the width direction of this utility model;

[0028] In the diagram, 1. Base; 11. Bottom wall; 111. First mounting hole; 112. Second mounting hole; 113. Isolation groove; 114. Retaining rib; 12. Side wall; 121. Clearance groove; 122. Mounting slot; 2. Static spring part; 21. Static spring sheet; 22. Static contact; 3. Moving spring part; 31. Moving spring sheet; 32. Moving spring lead-out sheet; 33. Moving contact; 4. Permanent magnet; 5. Magnetic shielding sheet; 6. Magnetic circuit part; 61. Armature part; 611. Plastic part; 612. Armature; 613. Magnet; 62. Coil frame; 63. Yoke; 64. Coil; 65. Iron core; 66. Rotating shaft; 7. Push card; 8. Guide plate; 9. Auxiliary static spring part; 10. Auxiliary moving spring part; 20. Outer shell. Detailed Implementation

[0029] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In addition, in the description of this utility model, unless otherwise stated, "at least two" means two or more.

[0031] Please see Figures 1-9 As shown, an electromagnetic relay of this utility model includes an insulated base 1, a contact portion, a magnetic circuit portion 6, and a permanent magnet 4. The contact portion includes a stationary spring portion 2 mounted on the base 1 and a moving spring portion 3 that cooperates with the stationary spring portion 2. The permanent magnet 4 is located outside the contact portion and is used to guide the electric arc generated by the breakage of the contact portion, so that the electric arc generated by the breakage of the contact portion moves along a predetermined path. The base 1 is provided with a clearance groove 121 on the movement path of the electric arc to provide clearance space for the electric arc when it is generated.

[0032] Preferably, the clearance groove 121 is a through groove structure that runs along the movement path of the electric arc, so as to optimize the arc propagation path to the greatest extent. In other embodiments, the clearance groove 121 is a blind groove structure, which can optimize the arc propagation path to a certain extent.

[0033] The base 1 includes a bottom wall 11 and two opposing side walls 12, each side wall 12 being disposed on the bottom wall 11 and extending upwards. A contact portion is located between the two side walls 12, and the direction of the contact portion is perpendicular to the arrangement direction of the two side walls 12. At least one side wall 12 is equipped with a permanent magnet 4, and the magnetic pole direction of the permanent magnet 4 (i.e., the direction of the line connecting the N and S poles of the permanent magnet 4) is consistent with the arrangement direction of the two side walls 12. The side wall 12 where the permanent magnet 4 is located has a clearance groove 121. In this embodiment, the clearance groove 121 is located below the permanent magnet 4, and the arc's movement path is downwards and bends towards the clearance groove 121. In this embodiment, the arrangement direction of the two side walls 12 is consistent with the width direction of the base 1, and the direction of the contact portion is consistent with the length direction of the base 1.

[0034] Preferably, permanent magnets 4 are mounted on the two sidewalls 12 respectively, with the opposite magnetic poles of the permanent magnet 4 on one sidewall 12 facing each other. This arrangement can create a stable magnetic field environment, effectively enhancing the magnetic field strength and thus better performing the function of magnetic blowout arc extinguishing. In other embodiments, when the permanent magnet 4 is relatively thick or its magnetic field strength is already large, or when the contact portion has only one set of contacts, only one permanent magnet 4 can be selected. This simplified design can further optimize the product structure and reduce production costs and complexity while ensuring the magnetic blowout arc extinguishing effect.

[0035] The moving spring portion 3 has at least two moving contacts 33 arranged side-by-side along the arrangement direction of the two side walls 12. The stationary spring portion 2 includes a stationary spring plate 21, on which a stationary contact 22 is provided corresponding to each moving contact 33. In this embodiment, the moving spring portion 3 is described with two moving contacts 33 as an example. Correspondingly, the stationary spring portion 2 also has two stationary contacts 22. Therefore, the contact portion forms a parallel structure of multiple sets of contacts, which can effectively reduce the contact resistance.

[0036] In this embodiment, the permanent magnet 4 is installed as follows: An installation groove 122 is provided on the outer side of the sidewall 12 where the permanent magnet 4 is located. This installation groove 122 is a blind groove structure. The permanent magnet 4 is installed in this installation groove 122, and can be fixed in the installation groove 122 by interference fit or adhesive fixing. This utility model also includes a magnetic shielding sheet 5 corresponding to the permanent magnet 4. This sheet is installed in the installation groove 122 and covers the permanent magnet 4 to provide external magnetic shielding. Specifically, the cross-section of the magnetic shielding sheet 5 is approximately U-shaped, with a receiving groove formed on one side. When installing the permanent magnet 4, the permanent magnet 4 is first inserted into this receiving groove, so that the magnetic shielding sheet 5 and the permanent magnet 4 are tightly combined to form a stable integral structure. Then, this integral structure is inserted into the installation groove 122 of the sidewall 12.

[0037] In this embodiment, the moving spring portion 3 is also mounted on the base 1, but it is not limited to this. In other embodiments, the moving spring portion is located on the armature portion of the magnetic circuit portion 6. The bottom wall 11 of the base 1 is provided with a first mounting hole 111 for mounting the stationary spring portion 2 and a second mounting hole 112 for mounting the moving spring portion 3. An insulating isolation structure is provided between the first mounting hole 111 and the second mounting hole 112 on the upward-facing side of the bottom wall 11 to increase the creepage distance between the stationary spring portion 2 and the moving spring portion 3.

[0038] Furthermore, the insulating isolation structure includes a plurality of isolation grooves 113 distributed along the arrangement direction of the stationary spring portion 2 and the moving spring portion 3, with adjacent isolation grooves 113 separated by partitions. In this embodiment, two isolation grooves 113 are used as an example, and the isolation grooves 113 are blind groove structures. The partition is specifically a baffle 114 integrally formed on the bottom wall 11, which extends along the arrangement direction of the two side walls 12. In other embodiments, the baffle 114 is replaced by a retaining wall, which is an equivalent replacement.

[0039] In this embodiment, the movable spring portion 3 includes a flexible movable spring sheet 31, a movable spring lead-out sheet 32, and a movable contact 33. The movable spring lead-out sheet 32 ​​is installed in the second mounting hole 112, and the upper end of the movable spring sheet 31 is fixedly connected to the upper end of the movable spring lead-out sheet 32. The movable contact 33 is disposed on the movable spring sheet 31. The magnetic circuit portion 6 is disposed on the base 1, and the armature portion 61 of the magnetic circuit portion 6 is connected to the movable spring sheet 31 through a push card 7. Guide plates 8 are respectively installed at the bottom of the two side walls 12 of the base 1, and the guide plates 8 provide upper limit positioning and motion guidance for the push card 7.

[0040] The armature part 61 is rotatably connected between the two side walls 12 of the base 1 via a rotating shaft, and the bottom of the armature part 61 is inserted into the corresponding slot of the push card 7. Specifically, the armature part 61 includes a plastic part 611 and an armature assembly disposed on the plastic part 611 by insert injection molding. The armature assembly is I-shaped, and its four ends extend out of the plastic part 611. The plastic part 611 is rotatably connected to the two side walls 12 of the base 1 via a rotating shaft 66, and the bottom end of the plastic part 611 is connected to the push card 7. The armature assembly is specifically composed of two parallel armatures 612 and a magnet 613 clamped between the two armatures 612. The magnetic circuit part 6 also includes a coil frame 62, a coil 64 wound around the coil frame 62, two yokes 63, and an iron core 65. The iron core 65 passes through the shaft hole of the coil frame 62. The two yokes 63 are L-shaped, and one side of each yoke 63 is riveted and fixed to both ends of the iron core 65. The free ends of the two yokes 63 are respectively inserted into the recesses on both sides of the armature portion 61, that is, the other side of one yoke 63 is fitted between the upper ends of the two armatures, and the other side of the other yoke 63 is fitted between the lower ends of the two armatures. Therefore, this utility model constitutes a magnetic latching relay, but is not limited thereto.

[0041] This utility model also includes a housing 20, which has an open bottom and is connected to a base 1, enclosing the contact part, push card 7, magnetic circuit part 6, etc., within its cavity. This utility model also includes a moving spring part 10 and an auxiliary stationary spring part 9 mounted on the base 1 and mutually assisting each other. The auxiliary moving spring part 10 is driven by the armature part 61, and the closed state of the auxiliary moving spring part 10 and the auxiliary stationary spring part 9 is the same as the closed state of the moving spring part 3 and the stationary spring part 2 (or they can be set differently).

[0042] This utility model discloses an electromagnetic relay whose contact portion is designed for a DC environment. When the two sets of contacts in the contact portion disconnect and generate an electric arc, the electric arcs generated by the two sets of contacts move downwards between the contacts under the influence of the magnetic fields of the permanent magnets 4 on both sides, and are bent downwards towards the corresponding permanent magnets 4 due to the influence of the permanent magnets 4 on both sides. Figure 9 As shown in the figure, the arrows indicate the movement path of the electric arc. Because the side wall 12 of the base 1 has a clearance groove 121 at a corresponding position below the permanent magnet 4 to avoid the electric arc, the arc will not burn onto the base 1 at that position. Furthermore, the clearance groove 121 forms an airflow channel, which can also induce the arc to move along the clearance groove 121, thereby significantly enhancing the stretching and cooling effect of the arc and reducing the impact of arc erosion on the insulation performance of the base 1. This effectively avoids the arc damaging the insulation performance between the load terminals, maintaining a good insulation state between the load terminals, thus not only improving the safety of the relay during operation but also extending the service life of the relay.

[0043] The electromagnetic relay of this utility model is identical to or can be implemented using existing technology for the parts not described herein.

[0044] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations 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 comprising a base, a contact portion, and a permanent magnet, the contact portion comprising a stationary spring portion mounted to the base, and a movable spring portion cooperating with the stationary spring portion; the permanent magnet being located outside the contact portion and being arranged to guide an arc produced by opening of the contact portion; characterized in that: The base is provided with a clearance groove on the movement path of the electric arc to provide clearance space for the electric arc when it is generated.

2. The electromagnetic relay according to claim 1, characterized in that: The clearance groove is a through-groove structure that runs along the movement path of the electric arc.

3. The electromagnetic relay according to claim 1, characterized in that: The base includes a bottom wall and two opposing side walls, which are respectively located on the bottom wall and extend upward; the contact portion is located between the two side walls, and the dividing direction of the contact portion is perpendicular to the arrangement direction of the two side walls; at least one side wall is equipped with the permanent magnet, and the magnetic pole direction of the permanent magnet is consistent with the arrangement direction of the two side walls; the side wall where the permanent magnet is located is provided with the clearance groove.

4. The electromagnetic relay according to claim 3, characterized in that: The two side walls are respectively equipped with permanent magnets, and the permanent magnets on one side wall and the permanent magnets on the other side wall have opposite magnetic poles facing each other; the moving spring part is provided with at least two moving contacts arranged in parallel along the arrangement direction of the two side walls, and the stationary spring part is provided with a stationary contact corresponding to each moving contact.

5. Electromagnetic relay according to claim 3 or 4, characterized in that: The clearance groove is located below the permanent magnet, and the movement path of the electric arc is downward and turns towards the clearance groove.

6. The electromagnetic relay according to claim 3 or 4, characterized in that: The outer side of the sidewall where the permanent magnet is located is provided with a mounting groove, and the permanent magnet is installed in the mounting groove; it also includes a magnetic shielding sheet corresponding to the permanent magnet, which is installed in the mounting groove and covers the permanent magnet to isolate it from the outside magnetic field.

7. The electromagnetic relay according to claim 3, characterized in that: The bottom wall is provided with a first mounting hole for mounting the stationary spring part and a second mounting hole for mounting the moving spring part. An insulating isolation structure is provided between the first mounting hole and the second mounting hole on the bottom wall to increase the creepage distance of the stationary spring part and the moving spring part.

8. The electromagnetic relay according to claim 7, characterized in that: The insulating isolation structure includes a plurality of isolation grooves distributed along the arrangement direction of the stationary spring portion and the moving spring portion, with adjacent isolation grooves separated by a partition.

9. The electromagnetic relay according to claim 8, characterized in that: The partition is an integrally formed retaining wall or retaining rib on the bottom wall; the isolation groove is a blind groove.

10. The electromagnetic relay of claim 7, wherein: The movable spring portion includes a flexible movable spring sheet, a movable spring lead-out sheet, and a movable contact. The movable spring lead-out sheet is installed in the second mounting hole, and the upper end of the movable spring sheet is fixedly connected to the upper end of the movable spring lead-out sheet. The movable contact is disposed on the movable spring sheet. It also includes a magnetic circuit portion and a pusher. The magnetic circuit portion is disposed on the base, and the armature portion of the magnetic circuit portion is connected to the movable spring sheet through the pusher.

Images