DC relay

Abstract

The utility model discloses a direct current relay, which comprises 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 positioned 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 group; 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 utility model, the arc-isolating piece can be used for isolating 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] The utility model relates to the technical field of relays, in particular to a DC relay. Background Art

[0002] At present, the main arc extinguishing method of the existing high-voltage epoxy relays is the magnetic blow arc extinguishing method. The principle is as follows: When the contact group disconnects, an arc will be generated. The continuous burning of the arc will cause serious damage to the contact surface of the contact group. Therefore, a permanent magnet is introduced outside the contact group, and the magnetic field of the permanent magnet is used to stretch the arc to achieve the cutting effect. The above contact group is usually arranged in an insulating support cover, and in order to save costs, the support cover is usually made of plastic material. Therefore, when the contact group breaks and an arc is generated, the arc will ablate the support cover made of plastic material. As the arc gradually ablates, the plastic wall thickness wrapping the permanent magnet is gradually consumed until the permanent magnet leaks out. When the contact group breaks again, the arc will directly ablate the permanent magnet in the arc moving direction. Due to the high temperature of the arc, the permanent magnet gradually demagnetizes, resulting in a weakening of the magnetic field strength, making it difficult to break the arc, and ultimately causing the product to explode and fail. Summary of the Utility Model

[0003] Aiming at the technical problems existing in the prior art, the utility model provides a DC relay, which is provided with a high-temperature resistant arc isolating member between the contact group and the permanent magnet to isolate the arc by using the arc isolating member and prevent the permanent magnet in the arc moving direction from being burned by the arc.

[0004] The technical solution adopted by the utility model to solve its technical problems is: A DC relay includes 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 static contact that cooperate with each other. The permanent magnet is arranged outside the contact group; At least a permanent magnet in the arc moving direction is configured with a high-temperature resistant and insulating arc isolating member between it and the contact group to separate the arc generated when the contact group breaks from the permanent magnet; The arc isolating member is installed in the installation groove correspondingly arranged on the support cover.

[0005] Further, the arc isolating member is made of inorganic material, and the arc isolating member is more high-temperature resistant than the support cover; The installation groove provides support for the arc isolating member.

[0006] Further, the installation groove has surrounding groove walls, one end of which in the arrangement direction of the moving contact and the static contact is closed, and the other end is provided with an opening for the arc isolating member to be inserted; The arc isolating member is in interference fit with the groove wall of the installation groove.

[0007] Further, the arc isolating member and the permanent magnet it cooperates with are located outside the arc extinguishing chamber.

[0008] Further, the arc separating member and the permanent magnet it cooperates with are installed in the same installation groove, and the arc separating member is in contact with the permanent magnet it cooperates with.

[0009] Further, the arc separating member is in the shape of a plate and is vertical, and a convex edge extending toward the side where the permanent magnet the arc separating member cooperates with is located is provided at the upper end of the arc separating member, and the convex edge blocks above the permanent magnet the arc separating member cooperates with.

[0010] Further, it further includes two static contacts and a moving contact piece distributed in parallel. The moving contact piece is arranged below the two static contacts, and the lower end portions of the static contacts are used as the static contact points. Moving contact points are respectively arranged at both ends of the moving contact piece in the length direction and respectively cooperate with the static contact points of the two static contacts; at least one permanent magnet is arranged outside the moving contact piece, and the arc separating member is arranged between the permanent magnet located outside the moving contact piece and the contact point group.

[0011] Further, permanent magnets are respectively arranged on the outer sides of both ends of the moving contact piece in the length direction.

[0012] Further, the two static contacts are respectively arranged on the top wall of the support cover, and the bottom ends of the two static contacts respectively extend into the arc extinguishing chamber of the support cover. The moving contact piece is located in the arc extinguishing chamber of the support cover; openings are respectively provided at the lower ends of the arc extinguishing chamber and the installation groove. A frame piece is connected to the bottom end of the support cover, and the frame piece seals the openings at the lower ends of the arc extinguishing chamber and the installation groove; it further includes a coil assembly located below the frame piece, and the moving contact piece is connected to the moving iron core of the coil assembly through a push rod member passing through the frame piece.

[0013] Further, the material of the arc separating member is ceramic or mica or quartz; the material of the support cover is plastic.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. Since the utility model is provided with a high-temperature resistant and insulating arc separating member between the permanent magnet at least in the arc moving direction and the contact point group to separate the arc generated by the breaking of the contact point group from the permanent magnet, the utility model can use the arc separating member to block the arc, avoiding the permanent magnet in the arc moving direction from being burned by the arc, thereby greatly reducing the risk of the permanent magnet in the arc moving direction being ablated by the arc and demagnetized and cracked, and further greatly improving the service life of the product.

[0016] 2. The arc separating member and the permanent magnet cooperating therewith are located outside the arc extinguishing chamber. Even if foreign matters are generated during the assembly process, the foreign matters will not enter the arc extinguishing chamber and will not affect the performance of the product. In addition, on the basis of a certain volume of the arc extinguishing chamber, locating the arc separating member and the permanent magnet cooperating therewith outside the arc extinguishing chamber will not occupy the space of the arc extinguishing chamber, thus avoiding reducing the arc drawing space and being unfavorable for arc extinguishing.

[0017] 3. The arc separating member of the present utility model is made of inorganic material, and the installation groove provides support and limitation for the arc separating member of the present utility model. Even when the arc separating member cracks due to arc ablation, the arc separating member will not separate. That is, under the support of the installation groove, the arc separating member can remain in its original state even if it cracks, so as to effectively block the corresponding permanent magnet and ensure that the product can continuously extinguish the arc.

[0018] 4. The installation groove has surrounding groove walls, and the arc separating member is in interference fit with the groove walls of the installation groove, so that the installation groove forms a surrounding block and a tight fit for the arc separating member, which can improve the support and shaping effect on the arc separating member, and can maintain the shaping effect on the arc separating member even if holes are burned in the groove walls of the installation groove by the arc.

[0019] 5. The arc separating member and the permanent magnet cooperating therewith are installed in the same installation groove, and the arc separating member and the permanent magnet cooperating therewith are in contact with each other, which can make the overall structure relatively compact and is beneficial to realizing the miniaturization of the product.

[0020] 6. The arc separating member is in a plate shape and is vertical, and a convex edge extending toward the side where the permanent magnet cooperating with the arc separating member is located is provided at the upper end of the arc separating member. The convex edge blocks above the permanent magnet cooperating with the arc separating member, so that the arc separating member of the present utility model can not only provide lateral arc blocking for the permanent magnet cooperating with the arc separating member, but also provide upper arc blocking for the permanent magnet cooperating with the arc separating member, thereby avoiding the permanent magnet in the arc movement direction being burned by the arc to the greatest extent and further ensuring that the product can continuously extinguish the arc.

[0021] The following further describes the present utility model in detail with reference to the drawings and embodiments; however, a DC relay of the present utility model is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-section of the present utility model Figure 1 ;

[0023] Figure 2 is a cross-section of the present utility model Figure 2 ;

[0024] Figure 3 is a cross-section of the present utility model Figure 3 ;

[0025] Figure 4 It is a schematic three-dimensional structure diagram of the arc isolation member of the present utility model;

[0026] In the figure, 1 is the support cover, 11 is the arc extinguishing chamber, 12 is the first installation groove, 13 is the second installation groove, 2 is the first permanent magnet, 3 is the arc isolation member, 31 is the convex edge, 4 is the static contact, 5 is the moving contact piece, 6 is the second permanent magnet, 7 is the frame piece, 8 is the coil assembly, 81 is the moving iron core, 9 is the push rod component, 10 is the outer shell, 20 is the iron cup, 30 is the yoke iron plate, 40 is the top cover, and 50 is the electric arc. Specific embodiments

[0027] In the present utility model, for terms such as "first" and "second", they are only used to distinguish similar objects, rather than to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. In the description, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, in the description of the present utility model, unless otherwise stated, "a plurality of" means two or more. In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Please refer to Figures 1 - 3As shown in the figure, a DC relay of the present utility model 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 in the arc extinguishing chamber 11 and includes a moving contact and a static contact that cooperate with each other. The permanent magnet is arranged outside the contact group and outside the arc extinguishing chamber 11. In the present utility model, a heat-resistant and insulating arc separating member 3 is arranged between the permanent magnet and the contact group at least in the direction of arc movement. The arc is the arc generated by the breaking of the contact group. Under the action of the magnetic field of the permanent magnet, the arc will be elongated and move along the magnetic field direction. The arrangement of the arc separating member 3 can separate the arc generated by the breaking of the contact group from the permanent magnet in the direction of arc movement. Therefore, the present utility model can use the arc separating member 3 to block the arc, avoiding the permanent magnet in the direction of arc movement from being burned by the arc, thereby greatly reducing the risk of demagnetization and cracking of the permanent magnet caused by arc erosion.

[0030] In this embodiment, the number of permanent magnets is multiple, and a part of the permanent magnets are in the direction of arc movement, while the rest of the permanent magnets are not in the direction of arc movement. For the sake of convenience of distinction, the permanent magnets in the direction of arc movement are defined as the first permanent magnets 2, and the permanent magnets not in the direction of arc movement are defined as the second permanent magnets 6. In this embodiment, only the arc separating member 3 is arranged between the first permanent magnet 2 and the contact group, but it is not limited thereto. In other embodiments, in addition to arranging the arc separating member between the first permanent magnet and the contact group, an arc separating member is also arranged between the second permanent magnet and the contact assembly. The dimensions of each permanent magnet in the arrangement direction of the moving contact and the static contact cover one or several of the static contact, the moving contact, and the contact gap between the static contact and the moving contact. Among the two surfaces of each permanent magnet with polarity, one surface faces the contact group, and the other surface faces away from the contact group.

[0031] The above-mentioned arc separating member 3 is installed in the corresponding installation groove of the support cover 1. Since the support cover 1 is also provided with an installation groove for installing the above-mentioned second permanent magnet 6, for the sake of convenience of distinction, the installation groove where the arc separating member 3 is located is defined as the first installation groove 12, and the installation groove where the second permanent magnet 5 is located is defined as the second installation groove 13.

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

[0033] The utility model includes two static contacts 4 distributed side by side and a moving contact piece 5. The moving contact piece 5 is arranged below the two static contacts 4. The lower end of the static contact 4 serves as the static contact point. The two ends of the moving contact piece 5 in the length direction are respectively provided with the moving contact points, and respectively cooperate with the static contact points of the two static contacts 4. In this embodiment, the two static contacts 4 are distributed side by side in the left - right direction. The length direction of the moving contact is the left - right direction, and the arrangement direction of the moving contact point and the static contact point is the up - down direction. At least one permanent magnet is arranged outside the moving contact piece 5, and an arc - separating piece 3 is arranged between the permanent magnet located outside the moving contact piece 5 and the contact group. That is, the permanent magnet located outside the moving spring piece 5 is the first permanent magnet 2. Specifically, the number of the first permanent magnets 2 is at least two, and two of the first permanent magnets 2 are arranged outside the two ends of the moving contact piece 5 in the length direction. In this embodiment, the case where the number of the first permanent magnets 2 is two is taken as an example for illustration. Therefore, the number of the arc - separating pieces 3 and the mounting grooves 12 is also two respectively.

[0034] The above - mentioned two static contacts 4 are respectively arranged on the top wall of the support cover 1, and the bottom ends of the two static contacts 4 respectively extend into the arc - extinguishing chamber 11 of the support cover 1. The moving contact piece 5 is located in the arc - extinguishing chamber 11 of the support cover 1. In this embodiment, the arc - separating piece 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 fixed, it can avoid reducing the arc - drawing space and being disadvantageous to arc extinguishing. And, even if foreign matters are generated during the assembly process of the arc - separating piece 3 and its cooperating permanent magnet (i.e., the first permanent magnet 2), the foreign matters will not run into the arc - extinguishing chamber 11 and will not affect the performance of the product.

[0035] In this embodiment, the first mounting groove 12 has surrounding groove walls. One end of it in the arrangement direction of the moving contact point and the static contact point is closed, and the other end is provided with an opening for the arc - separating piece 3 to be inserted. Since the arrangement direction of the moving contact point and the static contact point is the up - down direction, therefore, the two ends of the first mounting groove 12 are respectively the upper end and the lower end, or the top end and the bottom end. In this embodiment, the top end of the first mounting groove 12 is closed, and the bottom end is provided with an opening. The arc - separating piece 3 is in interference fit with the groove walls of the first mounting groove 12. Therefore, the first mounting groove 12 forms a surrounding block and a tight fit for the arc - separating piece 3, which can improve the supporting and shaping effect on the arc - separating piece 3, and can maintain the shaping effect on the arc - separating piece 3 even if holes are burned out on the groove walls of the first mounting groove 12 by the arc.

[0036] In this embodiment, the arc - separating piece 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 is in contact with the arc - separating piece 3. In this way, the overall structure is relatively compact, which is beneficial to realizing the miniaturization of the product.

[0037] The arc separating member 3 is plate-shaped and vertical, and the height and the dimension in the front-back direction of the arc separating member 3 are the same as those of the first permanent magnet 2, or the height and the dimension in the front-back direction of the arc separating member 3 are slightly larger than those of the first permanent magnet 2, so that the arc separating member 3 provides a comprehensive lateral separation for the first permanent magnet 2. A convex edge 31 extending towards the side where the permanent magnet (i.e., the first permanent magnet 2) that the arc separating member 3 mates with is provided at the upper end of the arc separating member 3, such that the arc separating member 3 is generally in a "7" shape or an inverted L shape. The convex edge 31 separates and blocks above the first permanent magnet 2, thereby separating and blocking the arc elongated above the first permanent magnet 2. Therefore, the arc separating member 3 of the present utility model can not only provide lateral arc blocking for the first permanent magnet 2, but also provide upper arc blocking for the first permanent magnet 2, thereby avoiding the first permanent magnet 2 being burned by the arc to the greatest extent, ensuring that the first permanent magnet 2 will not be demagnetized and cracked due to arc erosion, and ensuring that the product can continuously extinguish the arc.

[0038] The above-mentioned second permanent magnet 6 is arranged between the two static contacts 4, and the arrangement directions of the two surfaces with polarities of the second permanent magnet 6 are the same as the arrangement direction of the two static contacts 4. The polarities of the surfaces of the second permanent magnet 6 opposite to the first permanent magnet 2 are opposite, so that an attractive force is generated between the second permanent magnet 6 and the first permanent magnet 2, which can guide the magnetic induction lines of the first permanent magnet 2 to the arc ignition position, thereby enhancing the magnetic induction intensity at the arc ignition position. In this embodiment, the number of the second permanent magnets 6 is specifically two, and the two second permanent magnets 6 are arranged along the direction of the two static contacts 4. The support cover 1 is respectively provided with second installation grooves 13 corresponding to the respective second permanent magnets 6. The second installation grooves 13 have surrounding groove walls, and the top ends of the second installation grooves 13 are closed, and the bottom ends of the second installation grooves 13 are provided with openings. The respective second permanent magnets 6 are respectively installed in the corresponding second installation grooves 13 and are in interference fit with the groove walls of the second installation grooves 13.

[0039] A frame piece 7 is connected to the bottom end of the above-mentioned support cover 1. The frame piece 7 closes the lower openings of the arc extinguishing chamber 11 and the first installation groove 12, and at the same time provides support for the first permanent magnet 2 and the arc separating member 3. The present utility model further includes a coil assembly 8 located below the frame piece 7. The moving contact piece 5 is connected to the moving iron core 81 of the coil assembly 8 through a push rod member 9 passing through the frame piece 7. The present utility model further includes a housing 10, a top cover 40, an iron cup 20 and a yoke iron plate 30. The support cover 1 and the coil assembly 8 are arranged in the iron cup 20. The yoke iron plate 30 is located between the frame piece 10 and the coil assembly 8. The iron cup 20 is installed in the housing 10, and the top cover 40 is connected to the opening at the top end of the housing 10, and the top cover 40 is respectively provided with avoidance holes corresponding to the respective static contacts 4.

[0040] A DC relay of the present utility model. During the arc extinguishing process, under the magnetic field of the first permanent magnet 2 and the second permanent magnet 6, the arc 50 will gradually elongate to the clean area above the first permanent magnet 2 and the installation area of the first permanent magnet 2 on the side, as Figure 2 shown. Therefore, continuous arcing will burn through the part (made of plastic) of the support cover 1 above and on the side of the first permanent magnet 2. Since the arc separating member 3 has the characteristic of high temperature resistance and provides an all-round barrier to the first permanent magnet 2, during the long-term arc extinguishing process of the product, even if the arc 50 burns through the plastic above and / or on the side of the first permanent magnet 2, the arc 50 will be blocked by the arc separating member 3, thus preventing the arc 50 from directly burning the first permanent magnet 2 and causing demagnetization and cracking of the first permanent magnet 2, enabling the product to continuously and effectively extinguish the arc. When the arc separating member 3 is cracked due to continuous high-temperature ablation, due to the support and shaping provided by the first installation groove 12, the arc separating member 3 can maintain its original shape without scattering, thereby ensuring that the arc separating member 3 provides continuous and effective barrier to the first permanent magnet 2 and ensuring the stability of the long-term operation of the product.

[0041] For a DC relay of the present utility model, the parts not involved are the same as or can be implemented by the prior art.

[0042] The above embodiments are only used to further illustrate a DC relay of the present utility model, but the present utility model 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 utility model shall fall within the protection scope of the technical solution of the present utility model.

Claims

1. A DC relay, comprising an insulating support cover, a contact group, and one or more permanent magnets, wherein the support cover is provided with an arc extinguishing chamber, the contact group is located in the arc extinguishing chamber and comprises a movable contact and a static contact that cooperate with each other, and the permanent magnet is arranged outside the contact group; characterized in that: A high temperature resistant and insulating arc-isolating member is disposed between at least the permanent magnet in the arc moving direction and the contact group to isolate the arc generated by the disconnection of the contact group from the permanent magnet; The arc isolation member is installed in a mounting groove corresponding to the support cover.

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

3. The DC relay according to claim 2, characterized in that: The installation groove has groove walls all around, one end of which is closed in the arrangement direction of the moving contacts and the static contacts, and the other end is provided with an opening for the arc isolation member to be installed; the arc isolation member and the groove wall of the installation groove are in interference fit.

4. The DC relay according to claim 1, characterized in that: The arc isolation member and the permanent magnet matched therewith are located outside the arc extinguishing chamber.

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

6. The DC relay according to claim 5, characterized in that: The arc isolation piece is plate-shaped and vertical, and the upper end of the arc isolation piece is provided with a convex edge extending toward the side where the permanent magnet matched with the arc isolation piece is located, and the convex edge blocks the permanent magnet matched with the arc isolation piece.

7. The DC relay according to claim 1, characterized in that: It also includes two stationary contacts and a moving contact piece distributed in parallel, the moving contact piece is arranged below the two stationary contacts, and the lower end of the stationary contact serves as the stationary contact point, the moving contacts are respectively arranged at both ends of the moving contact piece in the length direction, and respectively cooperate with the stationary contacts of the two stationary contacts; at least one permanent magnet is arranged on the outside of the moving contact piece, and the arc isolation member is arranged 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 magnets are respectively arranged on the outer sides of both ends of the movable contact piece in the length direction.

9. The DC relay according to claim 7 or 8, characterized in that: The two static contacts are respectively arranged on the top wall of the support cover, and the bottom ends of the two static contacts are respectively extended into the arc extinguishing chamber of the support cover, and the moving contact piece 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, and the bottom end of the support cover is connected with a frame piece, 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 piece, and the moving contact piece is connected to the moving iron core of the coil assembly through a pushing rod component passing through the frame piece.

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

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