Direct-current relay

Abstract

The invention discloses a direct-current relay which comprises an insulated supporting cover, a contact set and one or more permanent magnets, the supporting cover is provided with an arc extinguishing chamber, the contact set is located in the arc extinguishing chamber and comprises a movable contact and a static contact which are matched with each other, and the permanent magnets are arranged on the outer side of the contact set; a high-temperature-resistant and insulated arc isolating piece is at least arranged between the permanent magnet in the moving direction of the arc and the contact group, so that the arc generated by breaking the contact group is isolated from the permanent magnet; and the arc isolating piece is mounted in a mounting groove which is correspondingly formed in the supporting cover. According to the invention, the arc barrier can be used for blocking the arc, and the permanent magnet in the moving direction of the arc is prevented from being burnt by the arc, so that the risk that the permanent magnet is ablated by the arc to demagnetize and crack is greatly reduced, and the service life of the product is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a DC relay. Background Technology

[0002] Currently, the main arc-extinguishing method for existing high-voltage epoxy relays is magnetic blowout arc extinguishing. The principle is as follows: During the disconnection process, an electric arc is generated. The continuous burning of this arc severely damages the contact surface of the contact group. To address this, a permanent magnet is introduced to the outside of the contact group. The magnetic field of the permanent magnet elongates the arc, achieving the cutting effect. These contact groups are typically housed within an insulated support cover, which is usually made of plastic to save costs. Therefore, when the contact group disconnects and generates an arc, the arc burns through the plastic support cover. As the arc gradually burns, the plastic wall surrounding the permanent magnet is gradually consumed, exposing the magnet. When the contact group disconnects again, the arc directly burns the permanent magnet in the direction of arc movement. Due to the high arc temperature, the permanent magnet gradually demagnetizes, leading to a weakening of the magnetic field strength. This makes it difficult to break the arc, ultimately causing the product to explode and fail. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a DC relay in which a high-temperature resistant arc-blocking component is provided between the contact group and the permanent magnet. The arc-blocking component blocks the electric arc, preventing the permanent magnet in the direction of arc movement from being burned by the arc.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: a DC relay, including an insulating support cover, a contact group, and one or more permanent magnets. The support cover is provided with an arc-extinguishing chamber. The contact group is located in the arc-extinguishing chamber and includes a moving contact and a stationary contact that cooperate with each other. The permanent magnet is disposed outside the contact group. At least the permanent magnet in the arc movement direction is disposed between the permanent magnet and the contact group and a high-temperature resistant and insulating arc-isolating component to separate the arc generated by the contact group from the permanent magnet. The arc-isolating component is installed in a mounting groove correspondingly provided in the support cover.

[0005] Furthermore, the arc-isolating component is made of inorganic material and is more heat-resistant than the support cover; the mounting groove provides support for the arc-isolating component.

[0006] Furthermore, the mounting groove has four sides of groove walls, one end of which is closed in the direction of arrangement of the moving and stationary contacts, and the other end is open for the insertion of the arc-blocking component; the arc-blocking component is interference-fitted with the groove wall of the mounting groove.

[0007] Furthermore, the arc-isolating component and its cooperating permanent magnet are located outside the arc-extinguishing chamber.

[0008] Furthermore, the arc-isolating component and its mating permanent magnet are installed in the same mounting groove, and the arc-isolating component and its mating permanent magnet are in contact with each other.

[0009] Furthermore, the arc-blocking member is plate-shaped and vertical, and the upper end of the arc-blocking member is provided with a protruding edge extending toward the side where the permanent magnet that the arc-blocking member is attached is located. The protruding edge blocks the permanent magnet that the arc-blocking member is attached to.

[0010] Furthermore, it also includes two stationary contacts arranged side by side and a moving contact piece. The moving contact piece is disposed below the two stationary contacts, and the lower end of the stationary contacts serves as the stationary contact point. The moving contact piece has moving contact points at both ends in the length direction, and they respectively correspond to and cooperate with the stationary contact points of the two stationary contacts. At least one permanent magnet is disposed on the outside of the moving contact piece, and the arc-blocking member is disposed between the permanent magnet located on the outside of the moving contact piece and the contact group.

[0011] Furthermore, the permanent magnets are respectively provided on the outer sides of both ends of the movable contact piece in the length direction.

[0012] Furthermore, the two stationary contacts are respectively disposed on the top wall of the support cover, and the bottom ends of the two stationary contacts respectively extend into the arc-extinguishing chamber of the support cover. The moving contact is located in the arc-extinguishing chamber of the support cover. The lower ends of the arc-extinguishing chamber and the mounting groove are respectively provided with openings. The bottom end of the support cover is connected to a frame plate, which blocks the opening at the lower end of the arc-extinguishing chamber and the opening at the lower end of the mounting groove. It also includes a coil assembly located below the frame plate, and the moving contact is connected to the moving iron core of the coil assembly through a push rod component passing through the frame plate.

[0013] Furthermore, the arc-isolating component is made of ceramic, mica, or quartz; the support cover is made of plastic.

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

[0015] 1. Because the present invention has a high-temperature resistant and insulating arc-blocking component between the permanent magnet and the contact group at least in the arc movement direction, the arc generated by the contact group is separated from the permanent magnet. This allows the present invention to use the arc-blocking component to block the arc, preventing the permanent magnet in the arc movement direction from being burned by the arc. This greatly reduces the risk of the permanent magnet in the arc movement direction being demagnetized and broken by arc erosion, thereby greatly improving the service life of the product.

[0016] 2. The arc-isolating component and its mating permanent magnet are located outside the arc-extinguishing chamber, ensuring that even if foreign objects are generated during assembly, they will not enter the arc-extinguishing chamber and thus will not affect the product's performance. Furthermore, given a fixed volume of the arc-extinguishing chamber, placing the arc-isolating component and its mating permanent magnet outside the chamber does not occupy space, thereby avoiding a reduction in arc-drawing space and hindering arc extinguishing.

[0017] 3. The arc-blocking component of the present invention is made of inorganic materials, and the present invention provides support and limit for the arc-blocking component by the mounting groove, so that even if the arc-blocking component is cracked due to arc erosion, the arc-blocking component will not separate. That is, under the support of the mounting groove, the arc-blocking component can maintain its original shape even if it cracks, thereby effectively blocking the corresponding permanent magnet and ensuring that the product can continuously extinguish the arc.

[0018] 4. The mounting groove has four sides of groove walls. The arc-blocking component and the groove walls of the mounting groove are interference fit, so that the mounting groove forms a four-sided enclosure and tight fit for the arc-blocking component. This can improve the support and shaping effect of the arc-blocking component, and even if the groove wall of the mounting groove is burned with holes by the electric arc, it can still maintain the shaping effect of the arc-blocking component.

[0019] 5. The arc-isolating component and its mating permanent magnet are installed in the same mounting groove, and the arc-isolating component and its mating permanent magnet are in contact with each other, which makes the overall structure more compact and is conducive to the miniaturization of the product.

[0020] 6. The arc-blocking component is plate-shaped and vertical, and the upper end of the arc-blocking component has a protruding edge extending towards the side where the permanent magnet that the arc-blocking component is located. This protruding edge blocks the permanent magnet that the arc-blocking component is located above, so that the arc-blocking component of the present invention can not only provide lateral arc blocking for the permanent magnet that the arc-blocking component is located, but also provide upper arc blocking for the permanent magnet that the arc-blocking component is located, thereby maximizing the prevention of the permanent magnet that is located in the arc movement direction from being burned by the arc, and further ensuring that the product can continuously extinguish the arc.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the DC relay of the present invention is not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the present invention. Figure 1 ;

[0023] Figure 2 This is a cross-sectional view of the present invention. Figure 2 ;

[0024] Figure 3 This is a cross-sectional view of the present invention. Figure 3 ;

[0025] Figure 4This is a three-dimensional structural schematic diagram of the arc-blocking component of the present invention;

[0026] In the figure, 1. Support cover, 11. Arc extinguishing chamber, 12. First mounting slot, 13. Second mounting slot, 2. First permanent magnet, 3. Arc isolation component, 31. Protruding edge, 4. Stationary contact, 5. Moving contact piece, 6. Second permanent magnet, 7. Frame piece, 8. Coil assembly, 81. Moving iron core, 9. Push rod component, 10. Outer shell, 20. Iron cup, 30. Yoke plate, 40. Top cover, 50. Electric arc. Detailed Implementation

[0027] In this invention, 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 the invention, 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 invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" refers to two or more. In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Please see Figures 1-3As shown, a DC relay of the present invention includes an insulating support cover 1, a contact group, and one or more permanent magnets. The support cover 1 is provided with an arc-extinguishing chamber 11. The contact group is located inside the arc-extinguishing chamber 11 and includes mutually cooperating moving contacts and stationary contacts. The permanent magnets are disposed outside the contact group and outside the arc-extinguishing chamber 11. The present invention provides a high-temperature resistant and insulating arc-isolating element 3 between the permanent magnets and the contact group, at least in the arc movement direction. The arc is the arc generated by the contact group's segmentation. Under the action of the magnetic field of the permanent magnets, the arc is elongated and moves along the magnetic field direction. The arc-isolating element 3 can separate the arc generated by the contact group's segmentation from the permanent magnets in the arc movement direction. Therefore, the present invention can use the arc-isolating element 3 to block the arc, preventing the permanent magnets in the arc movement direction from being burned by the arc, thereby greatly reducing the risk of demagnetization and breakage of the permanent magnets due to arc erosion.

[0030] In this embodiment, there are multiple permanent magnets, with some magnets positioned in the direction of arc movement and the rest not. For ease of distinction, the permanent magnets positioned in the direction of arc movement are defined as the first permanent magnet 2, and the permanent magnets not positioned in the direction of arc movement are defined as the second permanent magnet 6. In this embodiment, only the first permanent magnet 2 is provided with an arc-isolating element 3 between it and the contact group, but this is not a limitation. In other embodiments, in addition to the arc-isolating element between the first permanent magnet and the contact group, an arc-isolating element is also provided between the second permanent magnet and the contact assembly. The dimensions of each permanent magnet in the direction of arrangement of moving and stationary contacts cover one or more of the stationary contacts, moving contacts, and the contact gap between the stationary and moving contacts. Furthermore, of the two polarized faces of each permanent magnet, one face faces the contact group, and the other face faces away from the contact group.

[0031] The arc-isolating component 3 is installed in the mounting groove corresponding to the support cover 1. Since the support cover 1 is also provided with a mounting groove for installing the second permanent magnet 6, for easy distinction, the mounting groove where the arc-isolating component 3 is located is defined as the first mounting groove 12, and the mounting groove where the second permanent magnet 5 is located is defined as the second mounting groove 13.

[0032] In this embodiment, the arc-isolating component 3 is made of inorganic material, which is more heat-resistant than the support cover 1. Specifically, in this embodiment, the arc-isolating component 3 is made of ceramic, mica, or quartz, while the support cover 1 is made of plastic. The first mounting groove 12 provides support for the arc-isolating component 3, ensuring that even if the arc-isolating component 3 cracks due to arc erosion, it will not separate, thereby effectively blocking the first permanent magnet 2 and ensuring that the product can continuously extinguish the arc.

[0033] This invention includes two stationary contacts 4 arranged side-by-side and a movable contact piece 5. The movable contact piece 5 is disposed below the two stationary contacts 4, with the lower end of each stationary contact 4 serving as the stationary contact point. Movable contacts are respectively disposed at both ends of the movable contact piece 5 along its length, corresponding to and engaging with the stationary contacts of the two stationary contacts 4. In this embodiment, the two stationary contacts 4 are arranged side-by-side along a left-right direction, the length direction of the movable contact is also the left-right direction, and the arrangement direction of the movable contacts and stationary contacts is the up-down direction. At least one permanent magnet is disposed on the outer side of the movable contact piece 5, and the arc-blocking member 3 is disposed between the permanent magnet located on the outer side of the movable contact piece 5 and the contact group. That is, the permanent magnet located on the outer side of the movable contact piece 5 is the first permanent magnet 2. Specifically, there are at least two first permanent magnets 2, with the two first permanent magnets 2 disposed on the outer sides of both ends of the movable contact piece 5 along its length. In this embodiment, two first permanent magnets 2 are used as an example for explanation. Therefore, there are also two arc-blocking members 3 and two mounting grooves 12.

[0034] The two stationary contacts 4 are respectively disposed on the top wall of the support cover 1, and the bottom ends of the two stationary contacts 4 extend into the arc-extinguishing chamber 11 of the support cover 1. The moving contact 5 is located inside the arc-extinguishing chamber 11 of the support cover 1. In this embodiment, the arc-isolating component 3 and its cooperating permanent magnet (i.e., the first permanent magnet 2) are both located outside the arc-extinguishing chamber 11, and will not occupy the space of the arc-extinguishing chamber 11. When the volume of the arc-extinguishing chamber 11 is constant, the space for arc pulling can be reduced, which is not conducive to arc extinguishing. Furthermore, even if foreign objects are generated during the assembly process of the arc-isolating component 3 and its cooperating permanent magnet (i.e., the first permanent magnet 2), the foreign objects will not enter the arc-extinguishing chamber 11 and will not affect the performance of the product.

[0035] In this embodiment, the first mounting groove 12 has four surrounding walls. One end of the groove is closed in the direction of the arrangement of the moving and stationary contacts, while the other end has an opening for the arc-blocking member 3 to be inserted. Since the moving and stationary contacts are arranged vertically, the two ends of the first mounting groove 12 are the upper and lower ends, or the top and bottom ends, respectively. In this embodiment, the top end of the first mounting groove 12 is closed, and the bottom end has an opening. The arc-blocking member 3 is interference-fitted with the groove wall of the first mounting groove 12. Therefore, the first mounting groove 12 forms a four-sided enclosure and tight fit with the arc-blocking member 3, which can improve the support and shaping effect of the arc-blocking member 3, and even if the groove wall of the first mounting groove 12 is burned with holes by the electric arc, the shaping effect of the arc-blocking member 3 can still be maintained.

[0036] In this embodiment, the arc-isolating component 3 and its cooperating permanent magnet (i.e., the first permanent magnet 2) are installed in the same first mounting groove 12, and the first permanent magnet 2 and the arc-isolating component 3 are in contact with each other. In this way, the overall structure is more compact, which is conducive to the miniaturization of the product.

[0037] The arc-blocking component 3 is plate-shaped and vertical. Its height and front-rear dimensions are the same as, or slightly greater than, those of the first permanent magnet 2, providing comprehensive lateral blocking for the first permanent magnet 2. The upper end of the arc-blocking component 3 has a protruding edge 31 extending towards the side where the permanent magnet (i.e., the first permanent magnet 2) is located, making the arc-blocking component 3 approximately "7"-shaped or an inverted L-shaped. This protruding edge 31 blocks the arc above the first permanent magnet 2, thus blocking any arc that extends above it. Therefore, the arc-blocking component 3 of this invention not only provides lateral arc blocking for the first permanent magnet 2 but also provides upper arc blocking, thereby minimizing the risk of the first permanent magnet 2 being burned by the arc and ensuring that it will not be demagnetized or cracked due to arc erosion, thus ensuring continuous arc extinguishing of the product.

[0038] The aforementioned second permanent magnet 6 is disposed between the two stationary contacts 4, and the arrangement direction of the two polarized faces of the second permanent magnet 6 is consistent with the arrangement direction of the two stationary contacts 4. The polarity of the faces of the second permanent magnet 6 and the first permanent magnet 2 is opposite, so that the second permanent magnet 6 and the first permanent magnet 2 generate an attractive force, which can guide the magnetic field lines of the first permanent magnet 2 toward the arcing position, thereby enhancing the magnetic induction intensity at the arcing position. In this embodiment, the number of second permanent magnets 6 is specifically two, and the two second permanent magnets 6 are arranged along the direction of the two stationary contacts 4. The support cover 1 is provided with a second mounting groove 13 corresponding to each second permanent magnet 6. The second mounting groove 13 has four sides of groove walls, and the top of the second mounting groove 13 is closed, while the bottom of the second mounting groove 13 is open. Each second permanent magnet 6 is respectively installed in the corresponding second mounting groove 13 and is interference-fitted with the groove wall of the second mounting groove 13.

[0039] The bottom end of the aforementioned support cover 1 is connected to a frame plate 7, which closes the lower opening of the arc-extinguishing chamber 11 and the lower opening of the first mounting groove 12, while providing support for the first permanent magnet 2 and the arc-isolating component 3. The invention also includes a coil assembly 8 located below the frame plate 7, with the moving contact 5 connected to the moving iron core 81 of the coil assembly 8 via a push rod component 9 passing through the frame plate 7. The invention further includes a housing 10, a top cover 40, an iron cup 20, and a yoke plate 30. The support cover 1 and the coil assembly 8 are disposed within the iron cup 20, the yoke plate 30 is located between the frame plate 10 and the coil assembly 8, the iron cup 20 is inserted into the housing 10, and the top cover 40 is connected to the opening at the top of the housing 10, with clearance holes corresponding to each stationary contact 4.

[0040] In a DC relay of the present invention, during the arc extinguishing process, under the influence of the magnetic fields of the first permanent magnet 2 and the second permanent magnet 6, the arc 50 gradually elongates to the clean area above the first permanent magnet 2 and the mounting area of ​​the first permanent magnet 2 on the side, such as... Figure 2 As shown. Therefore, continuous arcing will burn through the plastic portion of the support cover 1 located above and to the side of the first permanent magnet 2. Because the arc-isolating component 3 has high-temperature resistance and provides all-around protection for the first permanent magnet 2, even if the arc 50 burns through the plastic above and / or to the side of the first permanent magnet 2 during long-term arc extinguishing, the arc 50 will be blocked by the arc-isolating component 3, thus preventing the arc 50 from directly burning the first permanent magnet 2 and causing demagnetization or cracking, allowing the product to continuously and effectively extinguish the arc. When the arc-isolating component 3 cracks due to continuous high-temperature erosion, the first mounting groove 12 provides support and shape fixation, allowing the arc-isolating component 3 to maintain its original shape and not fall apart, thus ensuring that the arc-isolating component 3 provides continuous and effective protection for the first permanent magnet 2, ensuring the long-term stability of the product.

[0041] The present invention relates to a DC relay, the parts of which are not described herein are the same as or can be implemented using existing technologies.

[0042] The above embodiments are only used to further illustrate a DC 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. A DC relay, comprising an insulated support cover, a contact group, and one or more permanent magnets, wherein the support cover has an arc-extinguishing chamber, the contact group is located within the arc-extinguishing chamber and includes mutually cooperating moving contacts and stationary contacts, and the permanent magnets are disposed outside the contact group; characterized in that: A high-temperature resistant and insulating arc-blocking component is disposed between the permanent magnet at least in the direction of arc movement and the contact group to separate the arc generated by the contact group from the permanent magnet. The arc-blocking component is installed in the mounting groove corresponding to the support cover.

2. The DC relay according to claim 1, characterized in that: The arc-blocking component is made of inorganic material and is more heat-resistant than the support cover; the mounting groove provides support for the arc-blocking component.

3. The DC relay according to claim 2, characterized in that: The mounting groove has four sides of groove walls. One end of the groove is closed in the direction of the arrangement of the moving and stationary contacts, and the other end is open for the insertion of the arc-blocking component. The arc-blocking component is interference-fitted with the groove wall of the mounting groove.

4. The DC relay according to claim 1, characterized in that: The arc-isolating component and its cooperating permanent magnet are located outside the arc-extinguishing chamber.

5. The DC relay according to any one of claims 1-4, characterized in that: The arc-isolating component and its mating permanent magnet are installed in the same mounting groove, and the arc-isolating component and its mating permanent magnet are in contact with each other.

6. The DC relay according to claim 5, characterized in that: The arc-blocking member is plate-shaped and vertical, and the upper end of the arc-blocking member has a protruding edge extending toward the side where the permanent magnet that the arc-blocking member is attached is located. The protruding edge blocks the area above the permanent magnet that the arc-blocking member is attached to.

7. The DC relay according to claim 1, characterized in that: It also includes two stationary contacts arranged side by side and a moving contact piece. The moving contact piece is disposed below the two stationary contacts, and the lower end of the stationary contacts serves as the stationary contact point. The moving contact piece has moving contact points at both ends in the length direction, and they respectively correspond to and cooperate with the stationary contact points of the two stationary contacts. At least one permanent magnet is disposed on the outside of the moving contact piece, and the arc-blocking member is disposed between the permanent magnet located on the outside of the moving contact piece and the contact group.

8. The DC relay according to claim 7, characterized in that: The permanent magnet is respectively provided on the outer sides of both ends of the moving contact piece in the length direction.

9. The DC relay according to claim 7 or 8, characterized in that: The two stationary contacts are respectively disposed on the top wall of the support cover, and the bottom ends of the two stationary contacts extend into the arc-extinguishing chamber of the support cover. The moving contact is located in the arc-extinguishing chamber of the support cover. The lower ends of the arc-extinguishing chamber and the mounting groove are respectively provided with openings. The bottom end of the support cover is connected to a frame plate, which blocks the opening at the lower end of the arc-extinguishing chamber and the opening at the lower end of the mounting groove. The support cover also includes a coil assembly located below the frame plate. The moving contact is connected to the moving iron core of the coil assembly through a push rod component passing through the frame plate.

10. The DC relay according to any one of claims 1-4, characterized in that: The arc-blocking component is made of ceramic, mica, or quartz; the support cover is made of plastic.

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