Single-phase self-holding relay with high breaking capacity

Abstract

The utility model relates to a single-phase latching relay with strong breaking capacity. The technical problems of long action time, poor breaking effect, short service life and the like in the prior art are solved. Comprising a base with an inner cavity, one end of the base is provided with two leading-out pins, each leading-out pin is provided with a static contact, a pushing block is movably arranged in the base, a bridge type contact set is arranged in the pushing block through an elastic movable installation structure, and the bridge type contact set is provided with movable contacts which are in one-to-one correspondence with the static contacts. And a driving and transmission mechanism capable of driving the pushing block to reciprocate in the base so as to enable the movable contact and the static contact to be mutually contacted or separated is arranged in the base. According to the utility model, through the reasonable design of the driving and transmission mechanism and the driving and transmission assembly, a gap which is close to 3mm is formed between the movable contact and the static contact, so that the breaking capacity requirement is met, and meanwhile, the arc extinguishing sheet can be lengthened and cool the arc under the action of electrodynamic force, so that the arc extinguishing is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of relays, and particularly relates to a single-phase self-holding relay with strong breaking capacity. Background Art

[0002] Self-holding and magnetic-holding relays are a new type of relay developed in recent years. Like other electromagnetic relays, they play the role of connecting and disconnecting circuits. The difference is that the normally closed or normally open state of the self-holding relay completely depends on the action of a micro motor, and the conversion of its switch state is triggered by a pulse electrical signal with a certain width and completed. After the signal disappears, it can still maintain the original switch state for a long time until a new reverse signal appears. However, the existing self-holding relays still have problems such as long action time, poor breaking effect, and short durability life. Summary of the Invention

[0003] The purpose of the utility model is to solve the above problems and provide a single-phase self-holding relay with strong breaking capacity.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: A single-phase self-holding relay with strong breaking capacity includes a base with an inner cavity. One end of the base is provided with two lead-out pins, and the lead-out pins are respectively provided with static contacts. A push block is movably arranged in the base. A bridge contact group is elastically and movably installed in the push block, and the bridge contact group has moving contacts respectively corresponding to the static contacts one by one. A driving and transmission mechanism is arranged in the base to drive the push block to reciprocate in the base so that the moving contacts and the static contacts are in contact with or separated from each other. The bridge contact group moves in the base through the driving and transmission mechanism, so as to achieve the contact and separation between the moving contacts of the bridge contact group and the static contacts of the lead-out pins.

[0005] In the above single-phase self-holding relay with strong breaking capacity, a longitudinally extending installation cavity is arranged in the base. The push block is movably arranged in the installation cavity. One end of the installation cavity has a movable cavity that is connected to the installation cavity and horizontally arranged in the base. The bridge contact group is movably arranged in the movable cavity.

[0006] In the above single-phase self-holding relay with strong breaking capacity, the lead-out pins are symmetrically arranged on both sides of one end of the base respectively. One end of each lead-out pin is respectively positioned in a positioning groove on the side of the movable cavity far from the installation cavity, and the other end horizontally penetrates through the base. The static contacts are arranged at one end of the lead-out pins by riveting or welding and respectively face the movable cavity. The lead-out pins can be extended into various shapes that are beneficial to connecting with the terminals of the electric energy meter and can be connected and fixed with other copper conductors.

[0007] In the above-mentioned single-phase self-holding relay with strong breaking capacity, two arc extinguishing plates are arranged in the base. The arc extinguishing plates are in [shape or L shape and are made of magnetically conductive metal materials. The arc extinguishing plates are respectively arranged at both ends of the moving cavity and are located on the outer periphery of the moving contact and the static contact. The use of the arc extinguishing plates is beneficial to the arc being stretched and cooled under the action of the electrodynamic force generated by the main circuit current when the main circuit is broken, so that the arc is quickly extinguished and the main circuit is effectively broken. The magnitude of the electrodynamic force is related to and proportional to the main circuit current, so it has a strong breaking capacity.

[0008] In the above-mentioned single-phase self-holding relay with strong breaking capacity, the driving and transmission mechanism includes a motor cavity longitudinally arranged in the base and located on one side of the installation cavity. A micro motor is arranged in the motor cavity. The micro motor is connected to a PCB board located in the motor cavity, and the micro motor is connected to a push block through a driving and transmission component. To meet the requirements of the relay closing and breaking time, a rare earth permanent magnet motor with high speed, low power consumption and wide driving voltage is adopted for the micro motor. Its magnetically conductive shell and high magnetic field intensity inside make the relay have a strong ability to resist external constant magnetic fields.

[0009] In the above-mentioned single-phase self-holding relay with strong breaking capacity, the driving and transmission component includes a compound gear arranged inside the installation cavity at the end far from the moving cavity through a compound gear shaft. The compound gear meshes with a worm arranged on the output shaft of the micro motor. A sector gear meshing with the compound gear is arranged on one side of the compound gear through a sector gear shaft. The outer end of the sector gear far from the sector gear shaft is hinged to one end of a driving rod through a first pin shaft, and the other end of the driving rod is hinged to one end of a push block through a second pin shaft. The worm meshes with the compound gear to transmit the torque and mechanical energy output by the micro motor to the compound gear. The compound gear converts the circumferential rotational motion into a linear motion through the sector gear and the driving rod, and drives the bridge contact group to move, so as to realize the connection and disconnection of the main circuit.

[0010] In the above-mentioned single-phase self-holding relay with strong breaking capacity, a pressing plate is arranged between the upper ends of the compound gear shaft and the sector gear shaft. A notch is arranged on the upper side of one end of the push block, and the second pin shaft is arranged in the notch. A stop spring acting on the inside of the base is arranged at the end of the push block with the notch. The pressing plate is used to prevent the compound gear and the sector gear from moving up and down on the compound gear shaft and the sector gear shaft during high-speed movement. The stop spring provides a reaction force for the sector gear at the contact disconnection position to prevent the micro motor from idling when excited.

[0011] In the above-mentioned single-phase self-holding relay with strong breaking capacity, the bridge-type contact group includes a contact bridge in the shape of a sheet. The moving contacts are respectively arranged on the same side of both ends of the contact bridge by riveting or welding. Two protrusions are respectively arranged on both sides of the contact bridge, and the protrusions on both sides of the contact bridge are arranged in one-to-one correspondence. The material of the contact bridge is a copper alloy with high conductivity and elastic modulus.

[0012] In the above-mentioned single-phase self-holding relay with strong breaking capacity, the elastic movable mounting structure includes an activity hole axially arranged in the pushing block. The activity holes respectively penetrate through the side part of the pushing block to form strip-shaped guiding parts on both sides of the pushing block. The contact bridge penetrates through one end of the activity hole. A sliding groove slidably connected with the strip-shaped guiding part is formed between the protrusions on both sides of the contact bridge, and the protrusions on both sides of the contact bridge are respectively slidably matched with the side part of the pushing block. An insulating pad is arranged in the activity hole. The positioning column at one end of the insulating pad is inserted and connected with the positioning hole at the center of the contact bridge, and a pressure spring acting in the activity hole is connected to the other end of the insulating pad. The insulating pad can prevent the heat on the copper alloy conductor from directly acting on the pressure spring for a long time, thereby preventing the elastic force of the pressure spring from failing. At the same time, the protrusions play a role in guiding and limiting.

[0013] In the above-mentioned single-phase self-holding relay with strong breaking capacity, one side of the base has an opening, and a cover plate adapted to the opening is arranged at the opening.

[0014] Compared with the existing technology, the advantages of the present utility model are as follows:

[0015] 1. Through the reasonable design of the driving and transmission mechanism and the driving and transmission components, a gap of nearly 3 mm is provided between the moving contact and the static contact, thereby meeting the breaking capacity requirements. At the same time, the arc extinguishing piece can stretch and cool the arc under the action of the electrodynamic force, which is beneficial to the extinguishment of the arc.

[0016] 2. The device uses a micro motor and only needs to change the excitation time to achieve the target requirements. At the same time, the micro motor itself has a magnetic iron shell. When the relay product requires resistance to an external constant magnetic field, the shielding cover structure of the product is greatly simplified, and the shielding cover structure can be simple and small in size.

[0017] 3. Through the bridge-type contact group, the relay product has a high ability in terms of withstanding, carrying, and closing short-circuit current, reducing the limitation on the use of contact materials and simplifying the structural complexity inside the product. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the present utility model after removing the cover plate.

[0019] Figure 2It is a schematic structural view of another perspective after removing the cover plate of the present utility model.

[0020] Figure 3 It is a schematic structural view of the base in the present utility model.

[0021] Figure 4 It is a schematic structural view of the elastic movable mounting structure and the driving and transmission components in the present utility model.

[0022] Figure 5 It is a schematic structural view of the bridge contact group in the present utility model.

[0023] In the figure: base 1, mounting cavity 11, movable cavity 12, positioning groove 13, arc extinguishing piece 14, lead-out pin 2, static contact 21, pushing block 3, notch 31, elastic movable mounting structure 4, movable hole 41, strip-shaped guiding portion 42, insulating pad 43, positioning post 44, pressure spring 45, bridge contact group 5, movable contact 51, contact bridge 52, protrusion 53, sliding groove 54, positioning hole 55, driving and transmission mechanism 6, motor cavity 61, micro motor 62, PCB board 63, worm 64, driving and transmission component 7, compound gear shaft 71, compound gear 72, sector gear shaft 73, sector gear 74, first pin shaft 75, driving rod 76, second pin shaft 77, pressing plate 78, stop spring 79. Specific embodiments

[0024] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0025] As Figures 1-5 shown, a single-phase self-holding relay with strong breaking capacity includes a base 1 with an inner cavity. Two lead-out pins 2 are provided at one end of the base 1, and static contacts 21 are respectively provided on the lead-out pins 2. A pushing block 3 is movably arranged in the base 1, and a bridge contact group 5 is arranged in the pushing block 3 through an elastic movable mounting structure 4. The bridge contact group 5 has movable contacts 51 respectively corresponding to the static contacts 21 one by one. A driving and transmission mechanism 6 is arranged in the base 1 to drive the pushing block 3 to reciprocate in the base 1 so that the movable contacts 51 and the static contacts 21 are in contact with or separated from each other. The bridge contact group 5 moves in the base 1 through the driving and transmission mechanism 6, so as to achieve the contact and separation between the movable contacts 51 of the bridge contact group 5 and the static contacts 21 of the lead-out pins 2.

[0026] As Figure 3 shown, a longitudinally extending mounting cavity 11 is provided in the base 1. The pushing block 3 is movably arranged in the mounting cavity 11. One end of the mounting cavity 11 has a movable cavity 12 which is connected to the mounting cavity 11 and transversely arranged in the base 1. The bridge contact group 5 is movably arranged in the movable cavity 12.

[0027] As Figure 2As shown in the figure, the lead-out pins 2 are symmetrically arranged on both sides of one end of the base 1 respectively. One end of each lead-out pin 2 is positioned in the positioning groove 13 on the side of the movable cavity 12 away from the installation cavity 11, and the other end passes through the base 1 horizontally. The static contacts 21 are arranged at one end of the lead-out pins 2 by riveting or welding and face the movable cavity 12 respectively. The lead-out pins 2 can be extended into various shapes that are beneficial to connecting with the terminals of the electric energy meter and can be connected and fixed with other copper conductors.

[0028] Among them, two arc extinguishing plates 14 are arranged in the base 1. The arc extinguishing plates 14 are in a [shape or L shape and are made of a magnetically conductive metal material. The arc extinguishing plates 14 are respectively arranged at both ends of the movable cavity 12 and are located on the outer periphery of the side of the movable contact 51 and the static contact 21. The use of the arc extinguishing plates 14 is beneficial to the arc being stretched and cooled under the action of the electrodynamic force generated by the main circuit current when the main circuit is disconnected, so that the arc is quickly extinguished and the main circuit is effectively disconnected. The magnitude of the electrodynamic force is related to the main circuit current and is proportional, so it has a strong breaking ability.

[0029] Combined Figure 1 and Figure 3 As shown in the figure, the driving and transmission mechanism 6 includes a motor cavity 61 longitudinally arranged in the base 1 and on one side of the installation cavity 11. A micro motor 62 is arranged in the motor cavity 61. The micro motor 62 is connected to the PCB board 63 located in the motor cavity 61, and the micro motor 62 is connected to the push block 3 through a driving and transmission component 7. To meet the requirements of the closing and breaking time of the relay, the micro motor 62 adopts a rare earth permanent magnet motor with high speed, low power consumption, and wide driving voltage. Its magnetically conductive shell and the high magnetic field intensity inside make the relay have a strong ability to resist external constant magnetic fields.

[0030] As Figure 4 shown in the figure, the driving and transmission component 7 includes a compound gear 72 arranged on the inner side of one end of the installation cavity 11 away from the movable cavity 12 through a compound gear shaft 71. The compound gear 72 meshes with a worm 64 arranged on the output shaft of the micro motor 62. On one side of the compound gear 72, a sector gear 74 meshing with the compound gear 72 is arranged through a sector gear shaft 73. One end of the sector gear 74 away from the sector gear shaft 73 is hinged to one end of a driving rod 76 through a first pin shaft 75, and the other end of the driving rod 76 is hinged to one end of the push block 3 through a second pin shaft 77. The worm 64 meshes with the compound gear 72 to transmit the torque and mechanical energy output by the micro motor 62 to the compound gear 72. The compound gear 72 converts the circumferential rotational motion into a linear motion through the sector gear 74 and the driving rod 76 and drives the bridge contact group 5 to move, thereby realizing the connection and disconnection of the main circuit.

[0031] Among them, a pressing plate 78 is provided between the upper ends of the compound gear shaft 71 and the sector gear shaft 73. A notch 31 is provided on the upper side of one end of the pushing block 3, and the second pin shaft 77 is arranged in the notch 31. A stop spring 79 acting in the base 1 is provided at the end of the pushing block 3 having the notch 31. The pressing plate 78 is used to prevent the compound gear 72 and the sector gear 74 from moving up and down on the compound gear shaft 71 and the sector gear shaft 73 during high-speed movement. The stop spring 79 provides a reaction force for the sector gear 74 at the contact disconnection position to prevent idling when the micro motor 62 is excited.

[0032] As Figure 5 shown, the bridge contact group 5 includes a sheet-shaped contact bridge 52. The moving contacts 51 are respectively arranged on the same side of both ends of the contact bridge 52 by riveting or welding. Two protrusions 53 are respectively provided on both sides of the contact bridge 52, and the protrusions 53 located on both sides of the contact bridge 52 are arranged in one-to-one correspondence. The contact bridge 52 is made of a copper alloy with a relatively high conductivity and elastic modulus.

[0033] As Figure 4 shown, the elastic movable mounting structure 4 includes an activity hole 41 axially arranged in the pushing block 3. The activity holes 41 respectively penetrate through the side parts of the pushing block 3 to form strip-shaped guiding parts 42 on both sides of the pushing block 3. The contact bridge 52 is inserted through one end of the activity hole 41. A sliding groove 54 slidably connected to the strip-shaped guiding parts 42 is formed between the protrusions 53 on both sides of the contact bridge 52, and the protrusions 53 on both sides of the contact bridge 52 are respectively slidably matched with the side parts of the pushing block 3. An insulating pad 43 is arranged in the activity hole 41. A positioning post 44 at one end of the insulating pad 43 is inserted and connected to a positioning hole 55 at the center of the contact bridge 52, and a pressure spring 45 acting in the activity hole 41 is connected to the other end of the insulating pad 43. The insulating pad 43 can prevent the heat on the copper alloy conductor from directly acting on the pressure spring 45 for a long time, thereby preventing the elastic force of the pressure spring 45 from failing. At the same time, the protrusions 53 play a role in guiding and limiting.

[0034] As Figure 1 shown, one side of the base 1 has an opening, and a cover plate adapted to the opening is provided at the opening.

[0035] The principle of this embodiment is as follows:

[0036] The bridge contact group 5 is installed in the pushing block 3 through the elastic movable mounting structure 4. The pushing block 3, under the cooperation of the driving and transmission mechanism 6 and the driving and transmission assembly 7, drives the bridge contact group 5 to move within the movable cavity 12. When the moving contact 51 of the bridge contact group 5 contacts the static contact 21 of the lead-out pin 2, the pressure spring 45 is compressed under force, and at the same time provides a certain contact pressure when the static contact 21 contacts the moving contact 51, ensuring the reliability of the contact. When the moving contact 51 of the bridge contact group 5 separates from the static contact 21 of the lead-out pin 2, an arc will be generated between the static contact 21 and the moving contact 51. Under the action of the electrodynamic force generated by the main circuit current, the arc will be guided to the arc extinguishing piece 14, and at the same time be elongated and accelerated in cooling, which is conducive to the arc extinguishing when the main circuit current passes through zero.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0038] Although terms such as base 1, mounting cavity 11, movable cavity 12, positioning groove 13, arc extinguishing piece 14, lead-out pin 2, static contact 21, pushing block 3, notch 31, elastic movable mounting structure 4, movable hole 41, strip-shaped guiding portion 42, insulating pad 43, positioning post 44, pressure spring 45, bridge contact group 5, moving contact 51, contact bridge 52, protrusion 53, sliding groove 54, positioning hole 55, driving and transmission mechanism 6, motor cavity 61, micro motor 62, PCB board 63, worm 64, driving and transmission assembly 7, compound gear shaft 71, compound gear 72, sector gear shaft 73, sector gear 74, first pin shaft 75, driving rod 76, second pin shaft 77, pressing plate 78, stop spring 79 are used more in this article, the possibility of using other terms is not excluded. Using these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A single-phase self-holding relay with strong breaking capacity, comprising a base (1) having an inner cavity, one end of the base (1) is provided with two lead pins (2), and static contacts (21) are respectively arranged on the lead pins (2), characterized in that, A push block (3) is movably arranged in the described base (1). A bridge contact group (5) is arranged in the push block (3) through an elastic movable mounting structure (4). The bridge contact group (5) has moving contacts (51) respectively corresponding to static contacts (21). A driving and transmission mechanism (6) is arranged in the base (1) and can drive the push block (3) to reciprocate in the base (1) so that the moving contacts (51) and the static contacts (21) are in contact with or separated from each other.

2. The single-phase self-holding relay with strong breaking capacity according to claim 1, characterized in that, An installation cavity (11) extending longitudinally is arranged in the base (1). The push block (3) is movably arranged in the installation cavity (11). One end of the installation cavity (11) has a movable cavity (12) that is connected to the installation cavity (11) and is horizontally arranged in the base (1). The bridge contact group (5) is movably arranged in the movable cavity (12).

3. The single-phase self-holding relay with strong breaking capacity according to claim 2, characterized in that, The lead-out pins (2) are symmetrically arranged on both sides of one end of the base (1) respectively. One end of each lead-out pin (2) is respectively positioned in a positioning groove (13) on the side of the movable cavity (12) away from the installation cavity (11), and the other end passes through the base (1) horizontally. The static contacts (21) are arranged at one end of the lead-out pins (2) by riveting or welding and are respectively oriented towards the movable cavity (12).

4. The single-phase self-holding relay with strong breaking capacity according to claim 2 or 3, characterized in that Two arc extinguishing plates (14) are arranged in the base (1). The arc extinguishing plates (14) are in a [shape or L shape and are made of a magnetically conductive metal material. The arc extinguishing plates (14) are respectively arranged at both ends of the movable cavity (12) and are located on the outer periphery of the sides of the moving contacts (51) and the static contacts (21).

5. A single-phase self-holding relay with strong breaking capacity according to claim 2 or 3, characterized in that, The driving and transmission mechanism (6) includes a motor cavity (61) longitudinally arranged in the base (1) and located on one side of the installation cavity (11). A micro motor (62) is arranged in the motor cavity (61). The micro motor (62) is connected to a PCB board (63) located in the motor cavity (61), and the micro motor (62) is connected to the push block (3) through a driving and transmission component (7).

6. The single-phase self-holding relay with strong breaking capacity according to claim 5, characterized in that The driving and transmission component (7) includes a compound gear (72) arranged inside the end of the installation cavity (11) away from the movable cavity (12) through a compound gear shaft (71). The compound gear (72) meshes with a worm (64) arranged on the output shaft of the micro motor (62). A sector gear (74) meshing with the compound gear (72) is arranged on one side of the compound gear (72) through a sector gear shaft (73). The outer end of the sector gear (74) away from the sector gear shaft (73) is hinged to one end of a driving rod (76) through a first pin shaft (75), and the other end of the driving rod (76) is hinged to one end of the push block (3) through a second pin shaft (77).

7. The single-phase self-holding relay with strong breaking capacity according to claim 6, characterized in that, A pressing plate (78) is arranged between the upper ends of the compound gear shaft (71) and the sector gear shaft (73). A notch (31) is arranged on the upper side of one end of the push block (3), and the second pin shaft (77) is arranged in the notch (31). A stop spring (79) acting in the base (1) is arranged at the end of the push block (3) with the notch (31).

8. A single-phase self-holding relay with strong breaking capacity according to claim 1, characterized in that, The described bridge contact group (5) includes a sheet-shaped contact bridge (52). The moving contacts (51) are respectively arranged on the same side of both ends of the contact bridge (52) by riveting or welding. Two protrusions (53) are respectively arranged on both sides of the contact bridge (52), and the protrusions (53) on both sides of the contact bridge (52) are arranged in one-to-one correspondence.

9. The single-phase self-holding relay with strong breaking capacity according to claim 8, characterized in that, The described elastic movable mounting structure (4) includes an activity hole (41) axially arranged in the pushing block (3). The activity holes (41) respectively penetrate through the side part of the pushing block (3) to form strip-shaped guiding parts (42) on both sides of the pushing block (3). One end of the contact bridge (52) is inserted into the activity hole (41). A sliding groove (54) that is slidably connected to the strip-shaped guiding part (42) is formed between the protrusions (53) on both sides of the contact bridge (52), and the protrusions (53) on both sides of the contact bridge (52) are respectively in sliding fit with the side part of the pushing block (3). An insulating pad (43) is arranged in the activity hole (41). A positioning column (44) at one end of the insulating pad (43) is inserted and connected to a positioning hole (55) at the center of the contact bridge (52), and a pressure spring (45) acting in the activity hole (41) is connected to the other end of the insulating pad (43).

10. A single-phase self-holding relay with strong breaking capacity according to claim 1, characterized in that, One side of the described base (1) has an opening, and a cover plate adapted to the opening is arranged at the opening.

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