Direct-current relay

Abstract

The utility model discloses a direct current relay, comprising a contact system which comprises a movable contact piece and a static contact piece which are matched with each other, and the movable contact piece is contacted with or disconnected from the static contact piece under the driving of a magnetic circuit system of the direct current relay; the arc extinguishing magnetic assembly comprises a special-shaped permanent magnet, and at least one end of the special-shaped permanent magnet is bent towards one side, so that a magnetic field on the bent side forms a magnetic line gathering area; the contact system is configured to be located on the bent side of the special-shaped permanent magnet and arranged corresponding to the magnetic line gathering area of the special-shaped permanent magnet. When the special-shaped permanent magnet is used as a carrier of an arc extinguishing magnetic field, most of the magnetic field generated by the special-shaped permanent magnet is concentrated towards the middle, that is, magnetic lines of force on the arc-shaped inner surface of the special-shaped permanent magnet are high in concentration degree at the central position of a contact and can better correspond to the contact part, so that a good arc extinguishing effect is achieved; in other words, compared with a square permanent magnet, the arc-shaped block-shaped permanent magnet is more beneficial to achieving utilization maximization of an arc extinguishing magnetic field, the initial moving speed of the arc is increased, and the arcing time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control devices, in particular to a direct current relay. Background Art

[0002] DC relay products in the prior art usually use square magnetic steel as the carrier of the arc extinguishing magnetic field. However, due to the special square structure of the square magnetic steel itself, the magnetic field at the edge cannot be concentrated to the middle, resulting in that the magnetic field strength in the middle area, i.e., the area corresponding to the contact part, is difficult to maximize, resulting in certain limitations in the arc extinguishing effect of the square magnetic steel. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a DC relay, which mainly solves the technical problem that it is difficult to maximize the utilization of the arc extinguishing magnetic field of square magnetic steel, resulting in certain limitations in its arc extinguishing effect.

[0004] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0005] A DC relay, comprising:

[0006] The contact system includes a moving contact and a stationary contact that cooperate with each other, and the moving contact contacts or disconnects with the stationary contact under the drive of the magnetic circuit system of the DC relay;

[0007] The arc-extinguishing magnetic assembly comprises a special-shaped permanent magnet, wherein at least one end of the special-shaped permanent magnet is bent to one side and the thickness of the bent end is relatively thin, so that the magnetic field on the bent side forms a magnetic field line gathering area;

[0008] The contact system is configured to be located on a curved side of the special-shaped permanent magnet and to be arranged corresponding to the magnetic field line gathering area thereof.

[0009] Furthermore, two ends of the special-shaped permanent magnet are bent toward the same side, and the special-shaped permanent magnet is thin at two ends and thick in the middle.

[0010] Furthermore, the special-shaped permanent magnet has an arc-shaped block structure as a whole, and the special-shaped permanent magnet gradually becomes thinner from the middle to both ends. The contact system is configured to be located on the side where the center of the special-shaped permanent magnet is located and is set corresponding to its magnetic field line gathering area.

[0011] Furthermore, the special-shaped permanent magnet has an arc-shaped block structure as a whole, and the special-shaped permanent magnet becomes thinner from the middle to both ends. The contact system is configured to be located on the side where the center of the special-shaped permanent magnet is located, and is set corresponding to its magnetic field line gathering area.

[0012] Furthermore, the arc-extinguishing magnetic assembly includes at least two special-shaped permanent magnets, the two special-shaped permanent magnets are arranged opposite to each other, and the contact system is located between the two special-shaped permanent magnets.

[0013] Furthermore, the static contact of the contact system includes at least two static contact terminals, and the dynamic contact of the contact system includes at least one dynamic contact piece. The two static contact terminals are respectively arranged corresponding to the dynamic contact pieces, and the positions where the static contact terminals contact the dynamic contact pieces form static contacts, and the positions where the dynamic contact pieces contact the static contact terminals form dynamic contacts.

[0014] Furthermore, the arc-extinguishing magnetic assembly further includes at least one auxiliary permanent magnet, which is located between two special-shaped permanent magnets, and the polarity of the auxiliary permanent magnet and the opposite side of the adjacent special-shaped permanent magnets is different, so that the magnetic fields generated by the permanent magnets have the same direction, thereby forming a magnetic field superposition effect;

[0015] Further, the DC relay includes two auxiliary permanent magnets, the two auxiliary permanent magnets are configured to be respectively arranged on the inner side of the static contact points of the two static contact terminals, and the two special-shaped permanent magnets are configured to be respectively arranged on the outer side of the static contact points of the two static contact terminals, and in the arrangement structure of the two special-shaped permanent magnets and the two auxiliary permanent magnets, the polarities of the opposite sides of each adjacent permanent magnet are arranged in an opposite manner;

[0016] Furthermore, the two auxiliary permanent magnets are configured to be closer to the static contact points of the corresponding static contact terminals than the special-shaped permanent magnets on the corresponding sides;

[0017] Furthermore, the auxiliary permanent magnet is a square permanent magnet structure;

[0018] Furthermore, the direction of the line connecting the two bent ends of the special-shaped permanent magnet is defined as the length direction of the permanent magnet, and the length direction dimension of the auxiliary permanent magnet is configured to be smaller than the length direction dimension of the special-shaped permanent magnet; the extension range of the special-shaped permanent magnet along the movement direction of the moving contact piece is configured to cover the positions of the moving contact and the static contact in the closed state and the open state.

[0019] Furthermore, the DC relay also includes an inner support cover, and the arc extinguishing magnetic component is fixedly mounted on the inner support cover.

[0020] Furthermore, an arc extinguishing chamber is formed in the inner support cover, and two special-shaped permanent magnet installation grooves are arranged on the outer side wall of the arc extinguishing chamber, which are arranged opposite to each other on the left and right and are used to adapt to install special-shaped permanent magnets, and the centers of the two special-shaped permanent magnet installation grooves are arranged opposite to each other inwardly;

[0021] Furthermore, the moving contact piece is arranged in the arc extinguishing chamber of the inner support cover, and a static contact terminal mounting hole for mounting the static contact terminal is opened at the upper end surface of the inner support cover, and the static contact point of the static contact terminal extends into the arc extinguishing chamber through the static contact terminal mounting hole and is arranged opposite to the moving contact point of the moving contact piece located in the arc extinguishing chamber;

[0022] Furthermore, an auxiliary permanent magnet installation groove for installing an auxiliary permanent magnet is formed at the upper end surface of the inner support cover, and the auxiliary permanent magnet installation groove is arranged at a position avoiding the movement range of the moving contact piece in the arc extinguishing chamber;

[0023] Furthermore, an outer arc surface and an inner arc surface are formed on the inner wall of the special-shaped permanent magnet installation groove, and the inner arc surface of the special-shaped permanent magnet installation groove is close to or overlaps with the outer side wall of the arc extinguishing chamber;

[0024] Furthermore, a fastening rib is formed on the outer arc surface of the special-shaped permanent magnet installation groove for fastening the special-shaped permanent magnet in the special-shaped permanent magnet installation groove;

[0025] Furthermore, the extending direction of the fastening rib is the same as the embedding direction of the special-shaped permanent magnet in the special-shaped permanent magnet installation groove;

[0026] Furthermore, the arc extinguishing chamber in the inner support cover is a circular cavity structure.

[0027] Furthermore, the DC relay further comprises a sealing cup, the inner support cover is an inner support cover structure made of resin material, the inner support cover is configured to be inserted and fixed in the sealing cup with interference fit, and an assembly positioning structure is provided between the inner support cover and the sealing cup for preventing the inner support cover from rebounding relative to the sealing cup;

[0028] Furthermore, a first positioning portion is provided on the sealing cup, and a second positioning portion is provided on the inner support cover. When the inner support cover is pressed into place in the sealing cup, the first positioning portion and the second positioning portion are configured to cooperate with each other to form an assembly positioning structure.

[0029] Furthermore, the first positioning portion is a card hole arranged on the side wall of the sealing cup, and the second positioning portion is a card protrusion arranged on the side wall of the inner support cover. When the inner support cover is pressed into place in the sealing cup, the card protrusion on the side wall of the inner support cover is correspondingly inserted into the card hole on the side wall of the sealing cup, and the card protrusion and the card hole cooperate with each other to form a snap-on assembly positioning structure.

[0030] Furthermore, a plurality of protrusions for improving the assembly coaxiality between the inner support cover and the sealing cup are dispersedly arranged on the outer peripheral wall of the inner support cover;

[0031] Further, the convex portion is formed at the middle position of the outer side wall of the special-shaped permanent magnet installation groove;

[0032] Furthermore, a locking protrusion is formed on the convex portion.

[0033] Further, the cross section of the special-shaped permanent magnet is crescent-shaped;

[0034] Furthermore, the ends of the two curved ends of the special-shaped permanent magnet are rounded.

[0035] The above technical solution has the following advantages or beneficial effects:

[0036] 1. At least one end of the special-shaped permanent magnet is bent to one side, and the thickness of the end is relatively thin. In this way, when it is used as a carrier of the arc-extinguishing magnetic field, the magnetic field on the bent side forms a magnetic field line gathering area, and most of the magnetic field generated by it is concentrated in the middle. Then, the contact system is configured to be located on the bent side of the special-shaped permanent magnet, that is, the contact part of the contact system is configured at a position with a high degree of magnetic field line gathering, which is conducive to arc extinguishing. At the same time, the arc-extinguishing magnetic field is maximized, which is conducive to product miniaturization.

[0037] 2. The special-shaped permanent magnet generally has an arc-shaped block structure, and is designed to be gradually thinner from the middle to the two ends. In this way, when it is used as a carrier of the arc-extinguishing magnetic field, most of the magnetic field it generates is concentrated in the middle, that is, the magnetic lines of force on the arc-shaped inner surface of the special-shaped permanent magnet are highly concentrated at the center of the contact, which can better correspond to the contact part, thereby producing a good arc-extinguishing effect. That is, the arc-shaped block permanent magnet is more conducive to maximizing the utilization of the arc-extinguishing magnetic field than the square permanent magnet, increasing the initial movement speed of the arc and shortening the arc burning time.

[0038] 3. The permanent magnets at both ends of the crescent-shaped permanent magnet are small in size, and the magnetic field strength is weaker than that in the middle, which reduces the gathering of arcs at the tip of the permanent magnets and reduces the erosion damage of arcs to the insulators on the inner side of the permanent magnets, which is beneficial to improving the electrical life of the product.

[0039] 4. The two auxiliary permanent magnets are arranged to be closer to the static contact points of the corresponding static contact terminals than the special-shaped permanent magnets on the corresponding sides. Such an arrangement is conducive to arc blowing after arc initiation.

[0040] 5. Since the auxiliary permanent magnet located in the middle has a smaller dimension in the length direction of the permanent magnet (or the width direction of the moving contact piece) than the length direction of the special-shaped permanent magnet, it can further help to gather the magnetic field to the contact position, thereby improving the arc extinguishing effect. Furthermore, due to the use of special-shaped permanent magnets, the volume of the auxiliary permanent magnet located in the middle of the special-shaped permanent magnet can be appropriately reduced, which is conducive to the miniaturization of the DC relay, and can reduce the amount of permanent magnets used, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a three-dimensional structural schematic diagram of a special-shaped permanent magnet according to an embodiment of the utility model.

[0042] Figure 2 It is a relative position structure diagram of the special-shaped permanent magnet, the auxiliary permanent magnet and the contact system in the embodiment of the utility model.

[0043] Figure 3 It is a schematic diagram of the magnetic field structure of the special-shaped permanent magnet and the auxiliary permanent magnet in the embodiment of the utility model.

[0044] Figure 4It is a three-dimensional structural schematic diagram of the inner support cover of an embodiment of the utility model.

[0045] Figure 5 It is a schematic diagram of the three-dimensional structure of the inner support cover from another angle of an embodiment of the utility model.

[0046] Figure 6 It is a structural schematic diagram of a sealing cup according to an embodiment of the utility model.

[0047] Figure 7 It is a schematic diagram of the assembly structure of the sealing cup and the inner support cover of the embodiment of the utility model.

[0048] Figure 8 It is a structural cross-sectional view of a DC relay according to an embodiment of the utility model.

[0049] Description of labels:

[0050] 1. Special-shaped permanent magnet, 2. Inner support cover, 3. Stationary contact terminal, 4. Auxiliary permanent magnet, 5. Sealing cup, 6. Moving contact piece, 21. Arc extinguishing chamber, 22. Special-shaped permanent magnet mounting groove, 23. Protrusion, 24. Stationary contact terminal mounting hole, 25. Auxiliary permanent magnet mounting groove, 26. Second positioning part, 51. First positioning part, 221. Outer arc surface, 222. Inner arc surface, 223. Fastening convex rib. DETAILED DESCRIPTION

[0051] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0052] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0053] Please refer to the attached Figure 1 To Attachment Figure 8An embodiment of the utility model provides a DC relay, comprising: a contact system, which includes a moving contact and a static contact that cooperate with each other, and the moving contact contacts or disconnects with the static contact under the drive of the magnetic circuit system of the DC relay; an arc extinguishing magnetic component, which includes a special-shaped permanent magnet 1, at least one end of the special-shaped permanent magnet 1 is bent to one side, and the thickness of the bent end is relatively thin, so that the magnetic field on the bent side forms a magnetic field line gathering area; the contact system is configured to be located on the bent side of the special-shaped permanent magnet 1, and is arranged corresponding to its magnetic field line gathering area. It can be understood that in this embodiment, since the special-shaped permanent magnet 1 has at least one curved end, the magnetic field on the curved side forms a magnetic field line gathering area, so that when it serves as a carrier of the arc extinguishing magnetic field, most of the magnetic field it generates is concentrated in the middle, that is, the magnetic field lines on the arc-shaped inner surface of the special-shaped permanent magnet 1 are highly concentrated at the center of the contact, which can better correspond to the contact part, thereby producing a good arc extinguishing effect, that is, the arc-shaped block permanent magnet is more conducive to maximizing the utilization of the arc extinguishing magnetic field than the square permanent magnet, thereby increasing the initial movement speed of the arc and shortening the arc burning time.

[0054] In the present embodiment, preferably, the two ends of the special-shaped permanent magnet 1 are bent to the same side, and the special-shaped permanent magnet 1 is thin at the two ends and thick in the middle, so that the special-shaped permanent magnet 1 is generally in a curved structure similar to a C shape. In this way, the magnetic lines of force at both ends of the special-shaped permanent magnet 1 will be more evenly gathered to the middle position of the bent side, and the degree of concentration is high and the magnetic field intensity is large, which is more conducive to maximizing the utilization of the arc extinguishing magnetic field, thereby improving the arc extinguishing effect.

[0055] Please refer to the attached Figure 2 , Attachment Figure 3 and attached Figure 8 In one preferred embodiment, the special-shaped permanent magnet 1 is an arc-shaped block structure as a whole, and the special-shaped permanent magnet 1 is gradually thinned from the middle to the two ends, and the contact system is configured to be located on the side where the center of the circle of the special-shaped permanent magnet 1 is located and is arranged corresponding to its magnetic field line gathering area. However, those skilled in the art should understand that in other embodiments, the structure of the special-shaped permanent magnet 1 is not limited to a smooth and regular C-shaped arc structure, and can also be a multi-section bent structure with a straight structure in the middle and two ends bent to the same side relative to the straight structure in the middle, as long as the magnetic field on one side of the two ends can generate a magnetic field line gathering area, and is not limited to the specific implementation method disclosed in this embodiment.

[0056] Please refer to the attached Figure 2 , Attachment Figure 3 and attached Figure 8In one preferred embodiment, the arc extinguishing magnetic assembly includes at least two special-shaped permanent magnets 1, the special-shaped permanent magnets 1 are arranged opposite to each other, and the contact system is located between the special-shaped permanent magnets 1. Preferably, the static contact of the contact system includes at least two static contact terminals 3, and the dynamic contact of the contact system includes at least one dynamic contact piece 6. The two static contact terminals 3 are respectively arranged corresponding to the dynamic contact piece 6, and the position where the static contact terminal 3 contacts the dynamic contact piece 6 forms a static contact point, and the position where the dynamic contact piece 6 contacts the static contact terminal 3 forms a dynamic contact point.

[0057] Please refer to the attached Figure 2 , Attachment Figure 3 and attached Figure 8 In one preferred embodiment, the arc extinguishing magnetic component further includes at least one auxiliary permanent magnet 4, the auxiliary permanent magnet 4 is located between the two special-shaped permanent magnets 1, and the polarity of the auxiliary permanent magnet 4 and the opposite side of the adjacent special-shaped permanent magnet 1 is different, so that the magnetic field directions generated by each permanent magnet are the same, thereby forming a magnetic field superposition effect; preferably, the arc extinguishing magnetic component includes two auxiliary permanent magnets 4, the two auxiliary permanent magnets 4 are configured to be respectively arranged on the inner side of the static contact points of the two static contact terminals 3, the two special-shaped permanent magnets 1 are configured to be respectively arranged on the outer side of the static contact points of the two static contact terminals 3, and in the arrangement structure of the two special-shaped permanent magnets 1 and the two auxiliary permanent magnets 4, the polarity of the opposite sides of each adjacent permanent magnet is arranged in an opposite manner; preferably, the two auxiliary permanent magnets 4 are configured to be compared with the special-shaped permanent magnets on the corresponding side. The magnet 1 is closer to the static contact of the corresponding static contact terminal 3, so it is arranged to be conducive to the arc blowing after the arc is struck; preferably, the auxiliary permanent magnet 4 is a square permanent magnet structure; preferably, the connection direction between the two curved ends of the special-shaped permanent magnet 1 is defined as the length direction of the permanent magnet, and the length direction dimension of the auxiliary permanent magnet 4 is configured to be smaller than the length direction dimension of the special-shaped permanent magnet 1; the extension range of the special-shaped permanent magnet 1 along the action direction of the moving contact piece 6 is configured to cover the position of the moving contact and the static contact in the closed state and the disconnected state, so that the magnetic field of the special-shaped permanent magnet 1 can fully cover the moving and static contacts, that is, the moving and static contacts are in the magnetic field line gathering area of ​​the special-shaped permanent magnet 1 in the closed state and the disconnected state, which is conducive to better achieving the arc extinguishing effect. In this embodiment, the two auxiliary permanent magnets 4 located in the middle have a smaller size in the length direction of the permanent magnet (or the width direction of the moving contact piece) than the length direction dimension of the special-shaped permanent magnet 1, so that it can further help to gather the magnetic field to the contact position, thereby improving the arc extinguishing effect. In addition, compared with the existing structure that uses two square magnetic steels to generate an arc extinguishing magnetic field, the use of two different-shaped permanent magnets 1 in this embodiment allows the volume of the two square auxiliary permanent magnets 4 to be appropriately reduced, which is beneficial to the miniaturization of the DC relay, and can reduce the amount of permanent magnets used, saving costs.

[0058] Please refer to the attached Figure 2 To Attachment Figure 5 , Attachment Figure 8In one preferred embodiment, the DC relay further includes an inner support cover 2, and the arc extinguishing magnetic component is fixedly mounted on the inner support cover 2.

[0059] Please refer to the attached Figure 2 To Attachment Figure 5 , Attachment Figure 8 In one preferred embodiment, an arc extinguishing chamber 21 is formed in the inner support cover 2, and two special-shaped permanent magnet mounting grooves 22 are arranged on the outer wall of the arc extinguishing chamber 21, which are arranged opposite to each other on the left and right and are used to fit and install the special-shaped permanent magnet 1, and the centers of the two special-shaped permanent magnet mounting grooves 22 are arranged opposite to each other inward. In this embodiment, the special-shaped permanent magnet mounting grooves 22 for installing the special-shaped permanent magnet 1 are arranged on the outer wall of the arc extinguishing chamber 21, which has the following advantages: 1. The arc extinguishing space can be maximized, which is beneficial to arc extinguishing; 2. The arc extinguishing space is large, and the distance between the internal contact structure and the inner wall of the inner support cover is farther, which can reduce the erosion damage of the arc to the corresponding position of the inner support cover, which is beneficial to improve the electrical life of the product.

[0060] Please refer to the attached Figure 2 To Attachment Figure 5 , Attachment Figure 8 In one preferred embodiment, preferably, the moving contact piece 6 is arranged in the arc extinguishing chamber 21 of the inner support cover 2, and a stationary contact terminal mounting hole 24 for mounting the stationary contact terminal 3 is opened at the upper end surface of the inner support cover 2. The stationary contact point of the stationary contact terminal 3 extends into the arc extinguishing chamber 21 through the stationary contact terminal mounting hole 24, and is arranged opposite to the moving contact point of the moving contact piece 6 located in the arc extinguishing chamber 21.

[0061] Please refer to the attached Figure 2 To Attachment Figure 5 , Attachment Figure 8In one preferred embodiment, preferably, an auxiliary permanent magnet mounting groove 25 for mounting the auxiliary permanent magnet 4 is formed at the upper end surface of the inner support cover 2, and the setting position of the auxiliary permanent magnet mounting groove 25 avoids the movement range of the moving contact piece 6 in the arc extinguishing chamber 21; preferably, an outer arc surface 221 and an inner arc surface 222 are formed on the inner wall of the special-shaped permanent magnet mounting groove 22, and the inner arc surface 222 of the special-shaped permanent magnet mounting groove 22 is close to or coincides with the outer wall of the arc extinguishing chamber 21; preferably, a fastening rib 223 for fastening the special-shaped permanent magnet 1 in the special-shaped permanent magnet mounting groove 22 is formed on the outer arc surface 221 of the special-shaped permanent magnet mounting groove 22; preferably, the extension direction of the fastening rib 223 is the same as the embedding direction of the special-shaped permanent magnet 1 in the special-shaped permanent magnet mounting groove 22; preferably, the arc extinguishing chamber 21 in the inner support cover 2 is a circular cavity structure. In this embodiment, a plurality of fastening ribs 223 are preferably provided on the outer arc surface 221. By providing the fastening ribs 223 on the outer arc surface 221, the special-shaped permanent magnet 1 can be more closely attached to the inner arc surface 222, thereby being closer to the contact structure in the arc extinguishing chamber 21, thereby producing a better arc extinguishing effect. In addition, the fastening ribs 223 can make the special-shaped permanent magnet 1 more firmly embedded and fixed in the special-shaped permanent magnet mounting groove 22.

[0062] Please refer to the attached Figure 2 To Attachment Figure 8In one preferred embodiment, the DC relay also includes a sealing cup 5, the inner support cover 2 is an inner support cover structure made of resin material, the inner support cover 2 is configured to be inserted and fixed in the sealing cup 5 with interference fit, and an assembly positioning structure is provided between the inner support cover 2 and the sealing cup 5; preferably, a first positioning portion 51 is provided on the sealing cup 5, and a second positioning portion 26 is provided on the inner support cover 2. When the inner support cover 2 is pressed into place in the sealing cup 5, the first positioning portion 51 and the second positioning portion 26 are configured to cooperate with each other to form an assembly positioning structure for preventing the inner support cover 2 from rebounding relative to the sealing cup 5; preferably, the first positioning portion 51 is a card hole provided on the side wall of the sealing cup 5, and the second positioning portion 26 is a card protrusion provided on the side wall of the inner support cover 2. When the inner support cover 2 is pressed into place in the sealing cup 5, the card protrusion on the side wall of the inner support cover 2 is correspondingly inserted into the card hole on the side wall of the sealing cup 5, and the card protrusion and the card hole cooperate with each other to form a snap-on assembly positioning structure. In one of the preferred embodiments, preferably, a plurality of protrusions 23 for improving the assembly coaxiality between the inner support cover 2 and the sealing cup 5 are dispersedly provided on the outer peripheral wall of the inner support cover 2; preferably, the protrusion 23 is formed at the middle position of the outer side wall of the special-shaped permanent magnet mounting groove 22; preferably, the locking protrusion is formed on the protrusion 23. However, those skilled in the art should understand that in other embodiments, the assembly positioning structure may also be other structures, and is not limited to the specific implementation method disclosed in this embodiment. For example, the first positioning portion 51 is a limiting protrusion arranged at the top of the inner side wall of the sealing cup 5, and the second positioning portion 26 is formed by the top outer edge of the inner support cover 2, so that when the inner support cover 2 is pressed into place in the sealing cup 5, the limiting protrusion on the sealing cup 5 and the top outer edge of the inner support cover 2 are pressed against each other to form an assembly positioning structure.

[0063] Please refer to the attached Figure 1 In one preferred embodiment, the cross-section of the special-shaped permanent magnet 1 is crescent-shaped; preferably, the ends of the two curved ends of the special-shaped permanent magnet 1 are rounded. In this way, the problem of the curved ends being bumped and causing gaps and thus causing changes in the magnitude of the magnetic force can be effectively improved during the assembly process. In this embodiment, the crescent-shaped arc-shaped block-shaped special-shaped permanent magnet 1 is thick in the middle and thin at both ends, so that the magnetic lines of force are more concentrated at the center position (corresponding to the contact part), which is beneficial to increase the magnetic field strength at the center position of the contact, increase the initial movement speed of the arc, and shorten the arcing time. In addition, the magnetic field strength at the tip is weak, which reduces aggregation and reduces erosion damage to the corresponding position of the inner support cover.

[0064] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. A DC relay, characterized in that: include: The contact system includes a moving contact and a stationary contact that cooperate with each other, and the moving contact contacts or disconnects with the stationary contact under the drive of the magnetic circuit system of the DC relay; The arc-extinguishing magnetic component comprises a special-shaped permanent magnet (1), wherein at least one end of the special-shaped permanent magnet (1) is bent toward one side, and the thickness of the bent end portion is relatively thin, so that the magnetic field on the bent side forms a magnetic field line gathering area; The contact system is configured to be located on the curved side of the special-shaped permanent magnet (1) and is arranged corresponding to the magnetic field line gathering area thereof.

2. The DC relay according to claim 1, characterized in that: The two ends of the special-shaped permanent magnet (1) are bent towards the same side, and the special-shaped permanent magnet (1) is thin at the two ends and thick in the middle.

3. The DC relay according to claim 1, characterized in that: The special-shaped permanent magnet (1) is an arc-shaped block structure as a whole, and the special-shaped permanent magnet (1) is gradually thinner from the middle to both ends. The contact system is configured to be located on the side where the center of the special-shaped permanent magnet (1) is located and is arranged corresponding to the magnetic field line gathering area thereof.

4. The DC relay according to claim 3, characterized in that: The arc-extinguishing magnetic component comprises at least two special-shaped permanent magnets (1), the two special-shaped permanent magnets (1) are arranged opposite to each other, and the contact system is located between the two special-shaped permanent magnets (1).

5. The DC relay according to claim 4, characterized in that: The static contact of the contact system comprises at least two static contact terminals (3), and the dynamic contact of the contact system comprises at least one dynamic contact piece (6). The two static contact terminals (3) are respectively arranged corresponding to the dynamic contact piece (6), and the position where the static contact terminal (3) contacts the dynamic contact piece (6) forms a static contact point, and the position where the dynamic contact piece (6) contacts the static contact terminal (3) forms a dynamic contact point.

6. The DC relay according to claim 5, characterized in that: The arc extinguishing magnetic assembly further comprises at least one auxiliary permanent magnet (4), the auxiliary permanent magnet (4) being located between two different-shaped permanent magnets (1), and the polarities of the auxiliary permanent magnet (4) and the adjacent different-shaped permanent magnets (1) on opposite sides thereof being different, so that the directions of the magnetic fields generated by the permanent magnets are the same, thereby forming a magnetic field superposition effect; Optionally, the DC relay comprises two auxiliary permanent magnets (4), the two auxiliary permanent magnets (4) are configured to be respectively arranged on the inner side of the static contacts of the two static contact terminals (3), and the two special-shaped permanent magnets (1) are configured to be respectively arranged on the outer side of the static contacts of the two static contact terminals (3), and in the arrangement structure of the two special-shaped permanent magnets (1) and the two auxiliary permanent magnets (4), the polarities of the opposite sides of each adjacent permanent magnet are arranged in an opposite manner; Optionally, the two auxiliary permanent magnets (4) are configured to be closer to the static contact points of the corresponding static contact terminals (3) than the special-shaped permanent magnets (1) on the corresponding sides; Optionally, the auxiliary permanent magnet (4) is a square permanent magnet structure; Optionally, the direction of the line between the two curved ends of the special-shaped permanent magnet (1) is defined as the length direction of the permanent magnet, and the length direction dimension of the auxiliary permanent magnet (4) is configured to be smaller than the length direction dimension of the special-shaped permanent magnet (1); Optionally, the extension range of the special-shaped permanent magnet (1) along the moving direction of the moving contact piece (6) is configured to cover the positions of the moving contact and the static contact in the closed state and the open state.

7. The DC relay according to any one of claims 1 to 6, characterized in that: The DC relay also includes an inner support cover (2), and the arc extinguishing magnetic component is fixedly mounted on the inner support cover (2).

8. The DC relay according to claim 7, characterized in that: An arc extinguishing chamber (21) is formed in the inner support cover (2), and two special-shaped permanent magnet installation grooves (22) are arranged opposite to each other on the left and right and are used to fit and install the special-shaped permanent magnet (1), and the centers of the two special-shaped permanent magnet installation grooves (22) are arranged opposite to each other inwardly; Optionally, the moving contact piece (6) is arranged in the arc extinguishing chamber (21) of the inner support cover (2), and a stationary contact terminal mounting hole (24) for mounting the stationary contact terminal (3) is provided at the upper end surface of the inner support cover (2), and the stationary contact point of the stationary contact terminal (3) extends into the arc extinguishing chamber (21) through the stationary contact terminal mounting hole (24), and is arranged opposite to the moving contact point of the moving contact piece (6) located in the arc extinguishing chamber (21); Optionally, an auxiliary permanent magnet mounting groove (25) for mounting the auxiliary permanent magnet (4) is formed at the upper end surface of the inner support cover (2), and the auxiliary permanent magnet mounting groove (25) is arranged at a position avoiding the movement range of the moving contact piece (6) in the arc extinguishing chamber (21); Optionally, an outer arc surface (221) and an inner arc surface (222) are formed on the inner wall of the special-shaped permanent magnet installation groove (22), and the inner arc surface (222) of the special-shaped permanent magnet installation groove (22) is close to or overlaps with the outer wall of the arc extinguishing chamber (21); Optionally, a fastening rib (223) for fastening the special-shaped permanent magnet (1) in the special-shaped permanent magnet installation groove (22) is formed on the outer arc surface (221) of the special-shaped permanent magnet installation groove (22); Optionally, the extending direction of the fastening rib (223) is the same as the embedding direction of the special-shaped permanent magnet (1) in the special-shaped permanent magnet mounting groove (22); Optionally, the arc extinguishing chamber (21) in the inner support cover (2) is a circular cavity structure.

9. The DC relay according to claim 7, characterized in that: The DC relay further comprises a sealing cup (5); the inner support cover (2) is an inner support cover structure made of resin material; the inner support cover (2) is configured to be inserted and fixed in the sealing cup (5) in an interference fit manner; and an assembly positioning structure is provided between the inner support cover (2) and the sealing cup (5) for preventing the inner support cover (2) from rebounding relative to the sealing cup (5); Optionally, a first positioning portion (51) is provided on the sealing cup (5), and a second positioning portion (26) is provided on the inner support cover (2); when the inner support cover (2) is pressed into place in the sealing cup (5), the first positioning portion (51) and the second positioning portion (26) are configured to form an assembly positioning structure that cooperates with each other; Optionally, the first positioning portion (51) is a snap-in hole provided on the side wall of the sealing cup (5), and the second positioning portion (26) is a snap-in protrusion provided on the side wall of the inner support cover (2). When the inner support cover (2) is pressed into place in the sealing cup (5), the snap-in protrusion on the side wall of the inner support cover (2) is correspondingly snapped into the snap-in hole on the side wall of the sealing cup (5), and the snap-in protrusion and the snap-in hole cooperate with each other to form a snap-in assembly positioning structure.

10. The DC relay according to claim 9, characterized in that: A plurality of protrusions (23) for improving the assembly coaxiality between the inner support cover (2) and the sealing cup (5) are dispersedly arranged on the outer peripheral wall of the inner support cover (2); Optionally, the convex portion (23) is formed at a middle position of the outer side wall of the special-shaped permanent magnet installation groove (22); Optionally, a latching protrusion is formed on the protrusion (23).

11. The DC relay according to claim 3, characterized in that: The cross section of the special-shaped permanent magnet (1) is crescent-shaped; Optionally, the ends of the two curved ends of the special-shaped permanent magnet (1) are rounded.

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