A relay with improved arc extinguishing performance

Abstract

The application discloses a relay with improved arc extinguishing performance, comprising a base, a contact system and an arc extinguishing cover, the arc extinguishing cover comprising two first side plates and a second side plate; the contact system comprising a moving spring part and a static spring part, the moving spring part comprising a moving spring piece and a moving contact, and the static spring part comprising a static spring piece and a static contact; the arc extinguishing cover enclosing the moving contact and the static contact, the working surface of the moving contact for contact cooperation with the static contact having a first end close to the second side plate and a second end away from the second side plate; when the moving contact and the static contact are disconnected, the second end of the working surface first leaves the static contact, and the first end of the working surface is the last to leave the static contact. The application makes the arc starting point of the moving contact and the static contact close to the second side plate of the arc extinguishing cover when they are disconnected, so that the arc extinguishing effect of the arc extinguishing cover is better.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a relay with improved arc-extinguishing performance. Background Technology

[0002] An electromagnetic relay is an electronic control device commonly used in automatic control circuits. It essentially acts as an "automatic switch," using a smaller current to control a larger current, thus playing roles in automatic adjustment, safety protection, and circuit switching. When the moving and stationary contacts of a relay break, they are prone to generating an electric arc. To quickly cool and extinguish this arc, many relays incorporate an arc-extinguishing shield to enclose the contact assembly. This shield has a semi-enclosed frame structure, consisting of two first side plates and a second side plate located between them. The arc generated by the breaking of the moving and stationary contacts strikes the arc-extinguishing shield and is extinguished by its cooling effect. Because the arc ignition point of the moving and stationary contacts is usually located in the middle of their contact surfaces, the arc ignition point is relatively far from the second side plate of the arc-extinguishing shield. The arc may not easily reach the second side plate, which is the primary arc-extinguishing part of the shield, resulting in poor arc-extinguishing effectiveness. If the arc is not effectively extinguished, it can easily burn the magnetic circuit above the contacts, especially the coil within the magnetic circuit. Especially when the relay structure is relatively compact, an arc that is not effectively extinguished is more likely to burn the magnetic circuit and its coil. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a relay that improves arc extinguishing performance. The relay makes the arc initiation point when the moving and stationary contacts break close to the main arc extinguishing part of the arc extinguishing chamber, thereby enabling the arc extinguishing chamber to extinguish arcs efficiently.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a relay for improving arc extinguishing performance, comprising a base, a magnetic circuit system, a contact system, and an arc extinguishing cover. The arc extinguishing cover includes two first side plates disposed opposite each other and a second side plate disposed between one end of the two first side plates. The contact system includes a moving spring portion and a stationary spring portion that cooperate with each other. The moving spring portion includes a moving spring sheet and a moving contact disposed on the moving spring sheet. The stationary spring portion includes a stationary spring sheet and a stationary contact disposed on the stationary spring sheet. The arc extinguishing cover encloses the moving contact and the stationary contact. The arrangement direction of the moving contact and the stationary contact is consistent with the arrangement direction of the two first side plates. The working surface of the moving contact for contacting and cooperating with the stationary contact has a first end close to the second side plate and a second end away from the second side plate. When the moving contact and the stationary contact are disconnected, the second end of the working surface leaves the stationary contact first, and the first end of the working surface leaves the stationary contact last.

[0005] Furthermore, the working surface is tilted in a direction that brings its first end closer to the stationary contact than its second end, with an tilt angle greater than or equal to 5°.

[0006] Furthermore, the second side plate includes a lower side plate and an upper side plate disposed at the upper end of the lower side plate, wherein the upper side plate is an inclined plate that slopes inward toward the inside of the arc extinguishing shroud.

[0007] Furthermore, it also includes an arc-blowing magnet, which is disposed on the base and located outside the second side plate, with one of the N pole and S pole of the arc-blowing magnet facing the second side plate.

[0008] Furthermore, an opening is formed between the other ends of the two first side plates, and a slot for an arc-extinguishing cover is provided on the base. The bottom of the arc-extinguishing cover is inserted into the slot, and the opening is retracted and deformed so that the bottom of the arc-extinguishing cover is locked in the slot.

[0009] Furthermore, the arc-extinguishing cover also includes two insert plates, which are respectively disposed at the bottom end of the two first side plates and extend downward, and the two insert plates are respectively inserted into the slots.

[0010] Furthermore, before the slot is inserted into the bottom of the arc-extinguishing shroud, the distance between the two first side plates gradually increases from one end to the other.

[0011] Furthermore, the base has a baffle wall located in the slot on the side near the second side plate, and the baffle wall is centrally located.

[0012] Furthermore, the moving spring portion includes two moving contacts, which are located on opposite sides of the moving spring sheet. The stationary spring portion includes two stationary spring sheets, each of which has a stationary contact. The stationary contacts of the two stationary spring sheets are arranged opposite to each other and cooperate with the two moving contacts on the moving spring sheet one by one.

[0013] Furthermore, there are multiple moving spring sections, stationary spring sections, and arc-extinguishing covers, with multiple stationary spring sections arranged in two parallel rows; the stationary spring plates of each stationary spring section are respectively mounted on the base, and the moving spring plates of each moving spring section are respectively vertical, with the moving contact provided at their lower ends, and their upper ends are respectively injection molded or fixedly connected to the same plastic insert, and the plastic insert is fixedly connected to the armature of the magnetic circuit system.

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

[0015] 1. Since the second end of the working surface of the moving contact leaves the stationary contact first and the first end of the working surface leaves the stationary contact last when the moving contact and the stationary contact are disconnected, the arc initiation point when the moving contact and the stationary contact are disconnected is closest to the second side plate of the arc extinguishing cover. This allows the arc generated when the moving contact and the stationary contact are disconnected to be effectively extinguished by the second side plate, which not only greatly improves the arc extinguishing effect of the arc extinguishing cover, but also ensures that the arc will not burn the magnetic circuit part and its coil located above the contact.

[0016] 2. The working surface is tilted so that its first end is closer to the stationary contact than its second end, and the tilt angle is greater than or equal to 5°, so that the moving contact can achieve the purpose of changing the arc starting point with a simple structural design, without affecting the contact effect between the moving contact and the stationary contact.

[0017] 3. The second side plate includes a lower side plate and an upper side plate disposed at the upper end of the lower side plate. The upper side plate is an inclined plate that slopes inward toward the inside of the arc-extinguishing hood, thereby improving the arc-extinguishing effect of the second side plate. In particular, when designing the arc-blowing magnet, the arc-blowing magnet can stretch the arc upward, and the upper side plate can effectively block and extinguish the arc.

[0018] 4. The present invention provides a slot on the base, the bottom of the arc extinguishing cover is inserted into the slot, and the opening is deformed inward, so that the arc extinguishing cover is held in the slot by tension. This not only makes the installation of the arc extinguishing cover more convenient, but also ensures that the arc extinguishing cover is fixed and effective for a long time and is not affected by high temperature (the prior art uses epoxy resin to fix the arc extinguishing cover. The curing of epoxy resin requires a certain amount of time, which makes the installation of the arc extinguishing cover not quick enough. Moreover, the cured epoxy resin is prone to aging under the long-term influence of the high temperature of the electric arc, resulting in poor fixation of the arc extinguishing cover or even falling off).

[0019] 5. The base is provided with the baffle wall in the slot, which can increase the creepage distance between the moving contact and the stationary contact of the contact assembly. Especially when the spatter accumulates under the lower side plate of the arc extinguishing shroud at the end of its life, it still has good insulation performance, thereby improving the insulation strength throughout the entire life cycle.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the relay with improved arc extinguishing performance of the present invention is not limited to the embodiments. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the arc-extinguishing shield of the present invention. Figure 1 ;

[0022] Figure 2 This is a three-dimensional structural diagram of the arc-extinguishing shield of the present invention. Figure 2 ;

[0023] Figure 3This is a top view of the arc-extinguishing shield of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the base of the present invention;

[0025] Figure 5 This is a schematic diagram showing the fit between the base, the arc-extinguishing shield, and a part of the contact system of the present invention.

[0026] Figure 6 yes Figure 5 Top view;

[0027] Figure 7 yes Figure 6 An enlarged schematic diagram of part A in the middle;

[0028] Figure 8 This is a schematic diagram showing the cooperation between the base, arc-extinguishing cover, contact system, etc. of the present invention;

[0029] Figure 9 This is a three-dimensional structural schematic diagram of the present invention (excluding the outer casing);

[0030] Among them, 1. Arc extinguishing cover, 11. First side plate, 12. Second side plate, 121. Lower side plate, 122. Upper side plate, 13. Insert plate, 2. Base, 21. Slot, 22. Barrier wall, 23. Insertion hole, 24. Installation position, 3. Moving contact, 31. Working surface, 4. Stationary contact, 5. Stationary spring, 6. Electric arc, 7. Moving spring, 8. Magnet, 9. Plastic parts, 10. Magnetic circuit system, 101. Armature. Detailed Implementation

[0031] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects and are not necessarily used 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" and "lower" in the description 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, and does not 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. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" refers to two or more.

[0032] Please see Figures 1-9As shown, a relay for improving arc extinguishing performance according to the present invention includes a base 2, a magnetic circuit system 10, a contact system, and an arc extinguishing cover 1. The arc extinguishing cover 1 has a semi-enclosed frame structure, including two first side plates 11 disposed opposite each other and a second side plate 12 disposed between one end of the two first side plates 11, with an opening formed between the other ends of the two first side plates 11. The two first side plates 11 and the second side plate 12 are integrally formed, but are not limited thereto. The contact system includes a moving spring portion and a stationary spring portion that cooperate with each other. The moving spring portion includes a moving spring plate 7 and a moving contact 3 disposed on the moving spring plate 7. The stationary spring portion includes a stationary spring plate 5 and a stationary contact 4 disposed on the stationary spring plate 5. The arc-extinguishing cover 1 encloses the moving contact 3 and the stationary contact 4. The arrangement direction of the moving contact 3 and the stationary contact 4 is consistent with the arrangement direction of the two first side plates 11. The working surface 31 of the moving contact 3, which is used to contact and cooperate with the stationary contact 4, has a first end close to the second side plate 12 and a second end away from the second side plate 12. When the moving contact 3 and the stationary contact 4 are disconnected, the second end of the working surface 31 leaves the stationary contact 4 first, and the first end of the working surface 31 leaves the stationary contact 4 last. In this way, the arc-starting point when the moving contact 3 and the stationary contact 4 are disconnected is close to the second side plate 12.

[0033] In this embodiment, the working surface 31 is a straight surface, and the working surface 31 is inclined in a direction that makes its first end closer to the stationary contact than its second end, and its inclination angle α is greater than or equal to 5°. Therefore, when the moving contact 3 and the stationary contact 4 are disconnected, the distance between the first end of the working surface 31 and the stationary contact 4 is the smallest, and the distance between the second end of the working surface 31 and the stationary contact 4 is the largest.

[0034] In this embodiment, the second side plate 12 includes a lower side plate 121 and an upper side plate 122 disposed on the upper end of the lower side plate 121. The upper side plate 122 is an inclined plate that slopes inward toward the arc-extinguishing cover 1, and the lower side plate 121 is a vertical plate. The upper side plate 122 and the lower side plate 121 are integrally formed, but are not limited thereto.

[0035] In this embodiment, the present invention also includes an arc-blowing magnet 8, which is disposed on the base 2 and located outside the second side plate 12, with one of the N pole and S pole of the arc-blowing magnet 8 facing the second side plate 12.

[0036] In this embodiment, the base 2 has a slot 21 at the corresponding position of the contact assembly. The bottom of the arc-extinguishing cover 1 is inserted into the slot 21, and the opening is retracted and deformed so that the bottom of the arc-extinguishing cover 1 is locked in the slot 21. Specifically, before the bottom of the arc-extinguishing cover 1 is inserted into the slot 21, the distance L between the two first side plates 11 gradually increases from one end to the other. Specifically, before the bottom of the arc-extinguishing cover 1 is inserted into the slot 21, the included angle β between the two first side plates 11 and the lower side plate 121 of the second side plate 12 is greater than 90°. Specifically, the included angle β between the two first side plates 11 and the second side plate 12 is approximately 92°. Figure 3 As shown, but not limited to. After the bottom of the arc-extinguishing cover 1 is inserted into the slot 21, the included angle β between the two first side plates 11 and the lower side plate 121 of the second side plate 12 becomes 90°.

[0037] In this embodiment, the arc-extinguishing cover 1 further includes two insert plates 13, which are respectively disposed at the bottom ends of the two first side plates and extend downward. The two insert plates 13 form the bottom of the arc-extinguishing cover 1 and are respectively inserted into the slots 21. The dimensions of the two insert plates 13 are smaller than the dimensions of the two first side plates 11.

[0038] In this embodiment, as Figure 4 As shown, the base 2 has a baffle 22 located in the slot 21 near the second side plate 12, with the baffle 22 centrally positioned. The baffle 22 increases the creepage distance between the moving contact 3 and the stationary contact 4 of the contact assembly, thereby improving insulation strength. Especially when debris accumulates below the lower side plate 121 of the arc-extinguishing shroud 1 at the end of its lifespan, it still maintains good insulation performance, thus improving the overall insulation strength throughout its lifespan. The height of the baffle 22 should not be too high; specifically, the height of the baffle 22 should be equal to or slightly less than the depth of the insert 21 to avoid interference with the moving spring 7 and to prevent accidental material falling or jamming when it is too close to the moving spring 7. In this embodiment, the moving spring portion includes two moving contacts 3, which are located on opposite sides of the moving spring 7. The stationary spring portion includes two stationary springs 5, each with a stationary contact 4. The stationary contacts 4 of the two stationary springs 5 ​​are arranged opposite to each other and respectively engage with the two moving contacts 3 on the moving spring 7. Of the two stationary springs 5, one is a normally closed stationary spring and the other is a normally open stationary spring. Therefore, this invention constitutes a changeover relay.

[0039] In this embodiment, there are multiple moving spring sections, stationary spring sections, and arc-extinguishing covers 1, with multiple stationary spring sections arranged in two parallel rows. The stationary spring plates 5 of each stationary spring section are respectively inserted into the base 1. The moving spring plates 7 of each moving spring section are vertical, and their lower ends are respectively provided with the moving contacts 3. Their upper ends are respectively injection-molded or fixedly connected to the same plastic part 9 insert. The plastic part 9 is fixedly connected to the armature 101 of the magnetic circuit system 10. The magnetic circuit system 10 is horizontal and located above the contacts. Figure 9 As shown. Therefore, the present invention is specifically a snap-fit ​​insertion type relay. The arc-extinguishing cover 1 corresponds one-to-one with the contact assembly formed by the moving spring part and the stationary spring part. Therefore, the arc-extinguishing covers 1 are also arranged in two parallel rows. The arc-blowing magnet 8 is located between the two rows of arc-extinguishing covers, and the N pole and S pole of the arc-blowing magnet 8 face the two rows of arc-extinguishing covers respectively. By adjusting the positive and negative poles when the upper end of the moving spring 7 and the lower end of the stationary spring 5 are energized, the arc-blowing magnet 8 can blow arcs upwards to each contact assembly.

[0040] This invention provides a relay with improved arc-extinguishing performance. When assembling the arc-extinguishing cover, simply press the two first side plates 11 of the arc-extinguishing cover 1 slightly inwards, making the included angle between the two first side plates 11 and the second side plate 12 less than or equal to 90°, and then insert the insertion plates 13 at the bottom of the two first side plates 11 into the slots 21. After releasing the two first side plates 11, they revert to their original shape, allowing the arc-extinguishing cover 1 to be secured in the slots 21 by its own tension. Therefore, this invention not only makes the installation of the arc-extinguishing cover 1 more convenient but also ensures that the arc-extinguishing cover 1 is permanently and effectively fixed, unaffected by high temperatures.

[0041] When the moving contact 3 contacts the stationary contact 4, the first end of the working surface 31 of the moving contact 3 contacts the stationary contact 4 first. As the moving spring 7 elastically deforms, the other parts of the working surface 31 of the moving contact 3 also contact the stationary contact 4 successively. When the moving contact 3 and the stationary contact 4 disconnect, the moving spring 7 returns to its original position by its own elastic force, causing the second end of its working surface to leave the stationary contact 4 first, while the first end of its working surface 31 leaves the stationary contact 4 last. Therefore, the first end of the working surface 31 of the moving contact is the arc initiation point (i.e., the part where the electric arc 6 is generated) when the moving contact 3 and the stationary contact 4 disconnect. This arc initiation point is close to the second side plate 12 of the arc extinguishing cover, so that the electric arc can be effectively blocked and extinguished by the two first side plates 11 and the second side plate 12 of the arc extinguishing cover 1, thereby improving the arc extinguishing effect of the arc extinguishing cover 1. In particular, under the action of the arc-blowing magnet 8, the electric arc 6 is stretched upward and effectively blocked and extinguished by the inclined upper side plate 122 of the second side plate 12. Therefore, the arc extinguishing performance of the present invention is greatly improved, and the arc erosion of the magnetic circuit portion 10 above the contact and its coil is effectively prevented.

[0042] The relay for improving arc extinguishing performance of the present invention has parts not covered (such as the specific structure of the magnetic circuit system 10) that are the same as or can be implemented using existing technology.

[0043] The above embodiments are only used to further illustrate a relay with improved arc extinguishing performance according to the present invention. However, 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. A relay for improving arc-extinguishing performance, comprising a base, a magnetic circuit system, a contact system, and an arc-extinguishing enclosure, wherein the arc-extinguishing enclosure comprises two first side plates disposed opposite each other and a second side plate disposed between one end of the two first side plates; the contact system comprises a movable spring portion and a stationary spring portion cooperating with each other, the movable spring portion comprising a movable spring sheet and a movable contact disposed on the movable spring sheet, and the stationary spring portion comprising a stationary spring sheet and a stationary contact disposed on the stationary spring sheet; the arc-extinguishing enclosure encloses the movable contact and the stationary contact, the arrangement direction of the movable contact and the stationary contact being consistent with the arrangement direction of the two first side plates, and the working surface of the movable contact for contacting and cooperating with the stationary contact having a first end close to the second side plate and a second end away from the second side plate; characterized in that: When the moving contact and the stationary contact are disconnected, the second end of the working surface leaves the stationary contact first, and the first end of the working surface leaves the stationary contact last. The base is provided with a slot for inserting an arc-extinguishing cover. The base is provided with a baffle wall on the side of the slot near the second side plate, which can increase the creepage distance between the moving contact and the stationary contact.

2. The relay with improved arc-extinguishing performance according to claim 1, characterized in that: The working surface is tilted in a direction in which its first end is closer to the stationary contact than its second end, and the tilt angle is greater than or equal to 5°.

3. The relay with improved arc-extinguishing performance according to claim 1, characterized in that: The second side plate includes a lower side plate and an upper side plate disposed at the upper end of the lower side plate, wherein the upper side plate is an inclined plate that slopes toward the inside of the arc extinguishing hood.

4. The relay with improved arc-extinguishing performance according to any one of claims 1-3, characterized in that: It also includes an arc-blowing magnet, which is disposed on the base and located outside the second side plate, with one of the N pole and S pole of the arc-blowing magnet facing the second side plate.

5. The relay with improved arc-extinguishing performance according to claim 1, characterized in that: An opening is formed between the other ends of the two first side plates, the bottom of the arc extinguishing cover is inserted into the slot, and the opening is retracted and deformed so that the bottom of the arc extinguishing cover is stuck in the slot.

6. The relay with improved arc-extinguishing performance according to claim 5, characterized in that: The arc-extinguishing cover also includes two insert plates, which are respectively located at the bottom end of the two first side plates and extend downwards, and are respectively inserted into the slots.

7. The relay with improved arc-extinguishing performance according to claim 5 or 6, characterized in that: Before the slot is inserted into the bottom of the arc-extinguishing shroud, the distance between the two first side plates gradually increases from one end to the other.

8. The relay with improved arc-extinguishing performance according to claim 5 or 6, characterized in that: The retaining wall is positioned in the center.

9. The relay with improved arc-extinguishing performance according to claim 1, characterized in that: The moving spring part includes two moving contacts, which are located on opposite sides of the moving spring. The stationary spring part includes two stationary springs, each of which has a stationary contact. The stationary contacts of the two stationary springs are arranged opposite to each other and each engages with one of the two moving contacts on the moving spring.

10. The relay with improved arc-extinguishing performance according to claim 1 or 9, characterized in that: The number of moving spring parts, stationary spring parts, and arc-extinguishing shrouds are multiple, with multiple stationary spring parts arranged in two parallel rows; the stationary spring plates of each stationary spring part are respectively mounted on the base, and the moving spring plates of each moving spring part are respectively vertical, with the moving contact at their lower end, and their upper ends are respectively injection molded or fixedly connected to the same plastic insert, and the plastic insert is fixedly connected to the armature of the magnetic circuit system.

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