Large-current low-temperature-rise magnetic latching relay with auxiliary contact

Abstract

The utility model discloses a heavy current low temperature rise magnetic latching relay with an auxiliary contact, which comprises a base, an electromagnetic assembly, an armature assembly, a push rod, a movable spring assembly, a static spring assembly and the like, and is characterized in that the movable spring assembly comprises a movable spring terminal, a movable spring sheet, a movable contact, a pressure spring and the like, and the movable contact and the pressure spring are arranged at the elastic end of the movable spring sheet; the elastic end and the pressure spring are jointly assembled in a driving groove in the end part of the push rod; therefore, when the push rod drives the movable contact to contact with the static spring assembly, the driving groove can synchronously push the compression spring to compress so as to improve the contact pressure between the push rod and the static spring assembly, thereby reducing the contact temperature rise and the contact pressure drop, and meeting the charging and battery replacing requirements; meanwhile, direct-current arcs generated when the movable contacts make contact with the static spring assembly are snapped through the magnetic blow-out assembly, arc extinguishing is rapid, contact bonding is avoided, use is safer, a microswitch is additionally arranged in the base, coil input, auxiliary contacts and loads are designed on the different sides, interference of the high-voltage side to the low-voltage side is avoided, and the reliability of product action is guaranteed.

Description

Technical Field

[0001] The utility model relates to a magnetic latching relay, in particular to a magnetic latching relay with auxiliary contacts and high current and low temperature rise. Background Art

[0002] Currently, with the booming development of new energy vehicles, charging and swapping technologies are maturing, and market competition is intensifying. Traditional charging high-voltage switching protection primarily uses high-voltage DC contactors to open and close circuits, which is costly and reduces competitive advantages. However, with the development of new technologies, the use of magnetic latching relays to perform the functions of the original high-voltage DC contactors can effectively reduce costs. However, traditional magnetic latching relays cannot meet the charging and swapping requirements in terms of DC load switching of 200A and above and terminal temperature rise. In addition, the coil input, auxiliary contacts, and load are designed on the same side, which can easily cause interference from the high-voltage side to the low-voltage side, affecting the reliability of the product operation, leading to relay failure and even accidents such as burnout of the entire device. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing technology and provide a magnetic latching relay with auxiliary contacts, large current and low temperature rise, which can effectively reduce the contact temperature rise and contact voltage drop, meet the charging and swapping requirements, avoid mutual interference between the high and low voltage sides, ensure the reliability of product operation, and be safer to use.

[0004] The technical problem of the utility model is achieved through the following technical solutions:

[0005] The invention relates to a magnetic latching relay with auxiliary contacts, large current and low temperature rise, comprising a base, an electromagnetic assembly, an armature assembly, a push rod, a dynamic spring assembly and a static spring assembly in the base; the electromagnetic assembly drives the armature assembly to swing back and forth, thereby driving the push rod to move back and forth, and the reciprocating push rod drives the dynamic spring assembly to contact the static spring assembly to connect the load circuit, or drives the dynamic spring assembly to separate from the static spring assembly to cut off the load circuit, the dynamic spring assembly is composed of a dynamic spring terminal and a dynamic spring piece, the dynamic spring terminal is fixed in the base, one end of the dynamic spring piece is fixed to the dynamic spring terminal, and the other end is suspended to form an elastic end, and a dynamic contact is provided on the front side of the elastic end, and a compression spring is provided on the rear side of the elastic end; the elastic end and the compression spring are jointly mounted in a driving groove at the end of the push rod, and the push rod drives the dynamic contact of the dynamic spring assembly to contact the static spring assembly, and the driving groove at the end of the push rod synchronously pushes the compression spring to compress and increase the contact pressure between the dynamic contact and the static spring assembly.

[0006] A magnetic blowing assembly is provided on the outer surface of the base, and the magnetic blowing assembly breaks the DC arc generated by the moving contact contacting the static spring assembly.

[0007] The magnetic blow assembly is composed of arc-extinguishing magnetic steel and magnetic isolation sheets.

[0008] A micro switch is provided in the base, and the push rod moves back and forth in the base and disengages from or contacts the micro switch, thereby controlling the micro switch to be in a normally closed state or an open state.

[0009] The micro switch serves as an auxiliary contact of the magnetic latching relay. The electromagnetic assembly has a coil terminal. Both the auxiliary contact and the coil terminal extend outward from the side of the base away from the movable spring assembly and the static spring assembly.

[0010] A driving block is provided in the middle of the armature assembly, and the end of the driving block is fitted in the connecting groove in the middle of the push rod. The electromagnetic assembly drives the armature assembly to swing back and forth, and drives the driving block to swing back and forth synchronously, and then the end of the driving block pushes the connecting groove to drive the reciprocating movement of the push rod.

[0011] The push rod is provided with a guide groove extending axially, and the reciprocating movement of the push rod is guided by the guide groove.

[0012] The bottom surface of the base is provided with a plurality of positioning convex bracts.

[0013] One end of the movable spring piece is fixed on the movable spring terminal, and the other end is two parallel elastic ends suspended above the movable spring terminal. A movable contact is provided on the front side of each elastic end, and a compression spring is provided on the rear side of each elastic end. The two elastic ends and the compression spring are jointly assembled in the driving groove at the end of the push rod.

[0014] The static spring assembly is composed of a static spring terminal fixed in the base and a pair of static contacts fixed on the static spring terminal, and the pair of static contacts respectively form contact or disengagement with the movable contacts at the two elastic ends; the ends of the static spring terminal and the movable spring terminal are both exposed from the bottom surface of the base to form the main contact terminals.

[0015] Compared with the prior art, the present invention mainly fixes the movable spring terminal of the movable spring assembly in the base, and one end of the movable spring piece of the movable spring assembly is fixed on the movable spring terminal, and the other end is suspended to form an elastic end, and a movable contact is provided on the front side surface of the elastic end, and a compression spring is provided on the rear side surface of the elastic end, and the elastic end and the compression spring are jointly assembled in the driving groove of the push rod end; in this way, when the electromagnetic assembly drives the push rod through the armature assembly to drive the movable contact of the movable spring assembly to contact the static spring assembly, the driving groove at the end of the push rod can also synchronously push the compression spring to compress and increase the contact pressure between the movable contact and the static spring assembly, thereby reducing the contact temperature rise and contact voltage drop, and meeting the needs of charging and swapping. At the same time, a magnetic blow assembly is provided on the outer surface of the base to break the DC arc generated by the moving contact contacting the static spring assembly, which extinguishes the arc quickly, avoids contact sticking, and is safer to use. Moreover, a micro switch is added inside the base, and the coil input, auxiliary contact and load are designed on different sides, so as to avoid interference of the high-voltage side on the low-voltage side and ensure the reliability of the product operation. In addition, a number of positioning convex buds are provided on the bottom surface of the base, and the PCBA board is supported and the magnetic latching relay is positioned and installed with the help of the positioning convex buds, which is beneficial to the heat dissipation of the PCBA board and the installation and positioning of the magnetic latching relay, ensuring that the structure is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 for Figure 1 3D exploded view of .

[0018] Figure 3 for Figure 1 Schematic diagram of the structure with the cover removed.

[0019] Figure 4 Schematic diagram of the structure of the bottom surface of the base.

[0020] Figure 5 It is a structural diagram of the dynamic spring assembly.

[0021] Figure 6 for Figure 5 Stereoscopic image. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] like Figures 1 to 6As shown, 1. base, 11. cover, 12. magnetic blow assembly, 121. arc extinguishing magnet, 122. magnetic isolation plate, 13. positioning convex bud, 14. main contact terminal, 15. baffle, 16. fixed plate, 2. electromagnetic assembly, 21. coil terminal, 22. left yoke, 23. right yoke, 3. push rod, 31. connecting groove, 32. drive groove, 33. movable groove, 34. guide groove, 4. micro switch, 41. auxiliary contact, 42. rocker arm, 5. static spring assembly, 51. static spring terminal, 52. static contact, 6. armature assembly, 61. rotating shaft, 62. left suction block, 63. right suction block, 64. drive block, 65. drive shaft, 7. dynamic spring assembly, 71. dynamic spring terminal, 72. dynamic spring piece, 73. dynamic contact, 74. compression spring.

[0024] A magnetic latching relay with auxiliary contacts, high current and low temperature rise, such as Figure 1 、 Figure 2 As shown, the charging and swapping accessories that can be used for new energy vehicles have a structure including a base 1, and other components such as an electromagnetic assembly 2, an armature assembly 6, a push rod 3, a dynamic spring assembly 7, a static spring assembly 5 and a micro switch 4 arranged in the base. A detachable cover 11 is also provided on the top of the base 1 for packaging.

[0025] The electromagnetic assembly 2 has a pair of yokes, namely Figure 2 、 Figure 3 The left yoke 22 and the right yoke 23 shown in FIG. 2 can generate magnetic attraction on the left and right yokes when the electromagnetic assembly 2 is energized.

[0026] The armature assembly 6 is mounted on one side of the electromagnetic assembly 2 through the fixing plate 16. Figure 3 As shown in the example, both sides of the middle part of the armature assembly 6, that is, the front and back sides of the middle part of the armature assembly are respectively provided with rotating shafts 61 on the same axis, and the rotating shaft on the back side is rotatably mounted in the base 1, and the rotating shaft on the front side is rotatably mounted on the fixed plate 16; at the same time, two left suction blocks 62 are provided at the left end of the armature assembly 6, and two right suction blocks 63 are provided at the right end, and the left yoke 22 of the electromagnetic assembly 2 is exactly located between the two left suction blocks 62, and the right yoke 23 is exactly located between the two right suction blocks 63.

[0027] In this way, when the electromagnetic component 2 is energized for positive excitation or reverse excitation, the two left suction blocks 62 and the two right suction blocks 63 can be alternately adsorbed through the left and right yokes. Specifically, when the electromagnetic component 2 is energized for positive excitation, the left yoke 22 adsorbs the left suction block 62 on the lower side and the right yoke 23 adsorbs the right suction block 63 on the upper side. When the electromagnetic component 2 is energized for reverse excitation, the left yoke 22 adsorbs the left suction block 62 on the upper side and the right yoke 23 adsorbs the right suction block 63 on the lower side. The armature component 6 is subjected to the positive and negative excitations of the electromagnetic component 2, and will swing back and forth around the central rotating shaft 61.

[0028] A driving block 64 is provided in the middle of the armature assembly 6. Specifically, a driving block 64 with a downward protruding cone shape is provided on the bottom surface of the middle of the armature assembly 6. A driving shaft 65 is provided at the end of the driving block, and the driving shaft is just fitted into the connecting groove 31 in the middle of the push rod 3 below the armature assembly 6; therefore, when the electromagnetic assembly 2 drives the iron assembly 6 to swing back and forth, it will drive the driving block 64 to swing back and forth synchronously, and then the driving shaft 65 at the end of the driving block pushes the connecting groove 31 to drive the push rod 3 to move back and forth.

[0029] Furthermore, the push rod 3 is provided with a guide groove 34 extending along the axial direction of the push rod, and the guide groove guides the left and right reciprocating movement of the push rod 3.

[0030] The static spring assembly 5 and the dynamic spring assembly 7 are both arranged on Figure 3 The left side of the base 1 shown in the figure is composed of a static spring assembly 5 and a pair of static contacts 52 fixed on the static spring terminal. The dynamic spring assembly 7 is composed of a dynamic spring terminal 71 and a dynamic spring piece 72. The dynamic spring terminal 71 is fixed in the base 1. One end of the dynamic spring piece 72, i.e. Figure 3 The upper end is fixed on the spring terminal 71, and the other end is suspended to form an elastic end. Figure 6 The other end shown is two parallel elastic ends suspended above the dynamic spring terminal 71, each elastic end is provided with a dynamic contact 73 on the front side, and a compression spring 74 is provided on the rear side of each elastic end; and the two elastic ends and the compression spring 74 are together mounted in the driving groove 32 at the end of the push rod 3, that is, Figure 3 In the driving groove 32 at the front end of the push rod shown.

[0031] Obviously, when the push rod 3 moves to the left and drives the pair of moving contacts 73 of the dynamic spring assembly 7 to contact the pair of static contacts 52 of the static spring assembly 5, the load circuit can be connected. At the same time, the driving groove 32 at the end of the push rod 3 will also synchronously push the compression springs 74 on the two elastic ends and compress them at the same time, thereby increasing the contact pressure between the pair of moving contacts 73 and the pair of static contacts 52, and reducing the contact voltage drop and the overall contact temperature rise to meet the requirements of charging and swapping; when the push rod 3 moves to the right and drives the pair of moving contacts 73 of the dynamic spring assembly 7 to disengage from the pair of static contacts 52 of the static spring assembly 5, the load circuit can be cut off.

[0032] The ends of the static spring terminal 51 and the dynamic spring terminal 71, that is, Figure 3 The lower ends shown are all exposed from the bottom surface of the base 1 to form the main contact terminal 14. In order to prevent the lower end of the movable spring terminal 71 from extending outward and interfering with the left and right reciprocating movement of the push rod 3, a movable groove 33 with a longer axial length is reserved between the driving groove 32 and the connecting groove 31 of the push rod.

[0033] The bottom surface of the base 1 is also provided with a plurality of positioning ridges 13. In this embodiment, three positioning ridges are designed. Each positioning ridge 13 has a step, and the step supports the PCBA board (not shown in the figure). A certain gap is created between the relay and the PCBA board, which is conducive to heat dissipation and reduces the risk of burning the PCBA board due to poor heat dissipation.

[0034] At the same time, the top raised part of the three positioning convex buds 13 can also play a special role. When the relay is inserted into the PCBA board, it is conducive to the insertion and positioning of the main contact terminal 14 of the relay, avoiding the product floating or misalignment during wave soldering due to incomplete insertion when there is no positioning, ensuring that the structure is more reliable.

[0035] The outer surface of the base 1 is provided with a magnetic blowing assembly 12. Figure 2 As shown in the example, they are respectively arranged on the outer surface of the cover 11 and the back of the base 1, and their positions correspond exactly to between the moving contact 73 and the static contact 52. Each magnetic blowing assembly 12 is composed of an arc-extinguishing magnetic steel 121 and a magnetic isolation sheet 122. The magnetic blowing assembly 12 is used to break the DC arc generated when the moving contact 73 contacts the static contact 52. The arc is extinguished quickly, contact adhesion is avoided, and it is safer to use.

[0036] The base 1 is also provided with a micro switch 4, which is located as shown in FIG. Figure 3 As shown, the micro switch 4 is located on the right side of the push rod 3. It is a normally closed structure and is fixed by gluing after being installed through the base 1 and the baffle 15. When the push rod 3 moves back and forth left and right in the base 1, the right end of the push rod can disengage from or contact the micro switch 4, thereby controlling the micro switch to be in a normally closed state or an open state.

[0037] The specific working process is as follows: when the push rod 3 moves to the left and drives the main contact terminal 14 to close, the load circuit is connected, and the right end of the push rod 3 is synchronously disengaged from the microswitch 4, so that the microswitch is in the normally closed state, and the detection circuit shows that the main circuit is in the on state; when the push rod 3 moves to the right and drives the main contact terminal 14 to disconnect, the load circuit is cut off, and the right end of the push rod 3 is synchronously contacted with the microswitch 4, that is, the rocker rod 42 of the microswitch is pushed to move to disconnect the normally closed contact of the microswitch. At this time, the microswitch 4 is in the disconnected state, and the detection circuit shows that the main circuit is also in the disconnected state.

[0038] In addition, the micro switch 4 plays the role of the auxiliary contact 41 of the magnetic latching relay. The electromagnetic assembly 2 has a coil terminal 21. The auxiliary contact 41 and the coil terminal 21 are both exposed from the side of the base 1 away from the dynamic spring assembly 7 and the static spring assembly 5. Figure 3 As shown, it extends from the right side of the base 1, that is, the coil input, auxiliary contacts and load are designed on different sides, thereby avoiding interference from the high-voltage side to the low-voltage side and ensuring the reliability of the product operation.

[0039] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design equivalent to this embodiment should be included in the protection scope of the present invention.

Claims

1. A magnetic latching relay with auxiliary contacts and high current and low temperature rise, comprising a base (1), and an electromagnetic assembly (2), an armature assembly (6), a push rod (3), a dynamic spring assembly (7) and a static spring assembly (5) in the base; the electromagnetic assembly (2) drives the armature assembly (6) to swing back and forth, thereby driving the push rod (3) to move back and forth, and the reciprocating push rod (3) drives the dynamic spring assembly (7) to contact the static spring assembly (5) to connect the load circuit, or drives the dynamic spring assembly (7) to separate from the static spring assembly (5) to cut off the load circuit, characterized in that The movable spring assembly (7) is composed of a movable spring terminal (71) and a movable spring piece (72), wherein the movable spring terminal (71) is fixed in the base (1), one end of the movable spring piece (72) is fixed on the movable spring terminal (71), and the other end is suspended to form an elastic end, and a movable contact (73) is provided on the front side of the elastic end, and a compression spring (74) is provided on the rear side of the elastic end; the elastic end and the compression spring (74) are jointly mounted in the driving groove (32) at the end of the push rod (3), and the push rod (3) drives the movable contact (73) of the movable spring assembly (7) to contact the static spring assembly (5), and the driving groove (32) at the end of the push rod (3) synchronously pushes the compression spring (74) to compress and increase the contact pressure between the movable contact (73) and the static spring assembly (5).

2. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that A magnetic blow assembly (12) is provided on the outer surface of the base (1), and the magnetic blow assembly breaks the DC arc generated when the moving contact (73) contacts the static spring assembly (5).

3. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 2, characterized in that The magnetic blowing assembly (12) is composed of arc-extinguishing magnetic steel (121) and a magnetic isolation sheet (122).

4. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that A micro switch (4) is provided in the base (1), and the push rod (3) moves back and forth in the base (1) and disengages from or contacts the micro switch (4), thereby controlling the micro switch (4) to be in a normally closed state or an open state.

5. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 4, characterized in that The micro switch (4) serves as an auxiliary contact (41) of the magnetic latching relay. The electromagnetic assembly (2) has a coil terminal (21). Both the auxiliary contact (41) and the coil terminal (21) extend outward from a side of the base (1) away from the movable spring assembly (7) and the static spring assembly (5).

6. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that A driving block (64) is provided in the middle of the armature assembly (6), and the end of the driving block is mounted in the connecting groove (31) in the middle of the push rod (3). The electromagnetic assembly (2) drives the armature assembly (6) to swing back and forth, and drives the driving block (64) to swing back and forth synchronously, and then the end of the driving block pushes the connecting groove (31) to drive the push rod (3) to move back and forth.

7. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that The push rod (3) is provided with an axially extending guide groove (34), and the reciprocating movement of the push rod (3) is guided by the guide groove.

8. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that The bottom surface of the base (1) is provided with a plurality of positioning convex bracts (11).

9. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 1, characterized in that One end of the movable spring piece (72) is fixed on the movable spring terminal (71), and the other end is two parallel elastic ends suspended above the movable spring terminal. A movable contact (73) is provided on the front side of each elastic end, and a compression spring (74) is provided on the rear side of each elastic end. The two elastic ends and the compression spring (74) are jointly mounted in the driving groove (32) at the end of the push rod (3).

10. A magnetic latching relay with auxiliary contacts and high current and low temperature rise according to claim 9, characterized in that The static spring assembly (5) is composed of a static spring terminal (51) fixed in the base (1) and a pair of static contacts (52) fixed on the static spring terminal, and the pair of static contacts respectively form contact or disengagement with the movable contacts (73) at the two elastic ends; the ends of the static spring terminal (51) and the movable spring terminal (71) are both exposed from the bottom surface of the base (1) to form the main contact terminal (14).

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