Relay and electricity meter

Abstract

The present disclosure provides a relay and an electricity meter. The relay comprises an accommodating member, an electric control part, and a guide member; the electric control part comprises a stationary contact group and a movable contact unit, wherein the stationary contact group is fixedly connected to the accommodating member and comprises two stationary contact members arranged in the X-axis direction, the movable contact unit moves relative to the accommodating member in the Y-axis direction and comprises a movable contact group corresponding to the stationary contact group, the movable contact group comprises movable contact members, each movable member is provided with two movable contacts, and the two movable contacts can contact or separate from corresponding stationary contact members in the Y-axis direction; the guide member is fixedly connected to the accommodating member and is located between the two movable contacts in the X-axis direction; and the guide member slidably engages with the movable contact unit only along a straight line extending in the Y-axis direction. The electricity meter uses the described relay. By using the described technical solution, the energy consumption of the relay is reduced compared with the prior art.

Description

Relays and electric meters

[0001] This disclosure claims priority to Chinese patent application No. 202410361960.4 filed on March 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the field of relays, and in particular to a relay and an electric meter. Background Art

[0003] A relay according to the prior art includes a container, an electrical control part, and a drive part. The electrical control part is used to control the on and off of an external circuit. The electrical control part includes a static contact group and a moving contact unit. The static contact group is fixed to the container and includes two static contacts arranged along the X-axis direction, and the two static contacts are used to connect to the external circuit. The moving contact unit moves along the Y-axis direction relative to the container and includes a pusher and a moving contact group corresponding to the static contact group. The moving contact group includes a moving contact, which can contact or move away from the two static contacts along the Y-axis direction. When the moving contact contacts the two static contacts, the two static contacts are turned on; when the moving contact moves away from the two static contacts, the two static contacts are turned off. The drive part is used to drive the moving contact unit to move along the Y-axis direction. The drive part includes a magnetic circuit unit. The magnetic circuit unit includes a coil assembly and an armature assembly. When the magnetic circuit unit has a magnetic holding function, the magnetic circuit unit can adopt a swinging magnetic circuit unit, that is, the armature assembly swings relative to the coil assembly, and transmits the tangential component of the armature assembly's swing to the pusher, driving the moving contact unit to move along the Y-axis direction. Specifically, the armature assembly is provided with a swing arm, and the swing arm abuts and cooperates with the pusher along the Y-axis direction. The swing arm serves as the output end of the driving part, and is used to drive the moving contact unit to move along the Y-axis direction.

[0004] In the prior art, in order to ensure that the movable contact unit moves linearly along the Y-axis, some technical solutions will provide guide members. The guide members are provided on both sides of the pusher along the X-axis. The guide members are fixedly connected to the accommodating member and slide in cooperation with the pusher.

[0005] However, it is found in practice that in the above relay structure, the coil assembly consumes more energy. Summary of the Invention

[0006] The purpose of the present disclosure is to overcome the above-mentioned defects or problems existing in the background technology and to provide a relay and an electric meter with reliable movement and low energy consumption.

[0007] In order to achieve the above objectives, the following technical solutions are adopted:

[0008] The first technical solution relates to a relay, which includes an accommodating part, an electrical control part and a guide part; the electrical control part includes a static contact group and a moving contact unit, the static contact group is fixedly connected to the accommodating part and includes two static contacts arranged along the X-axis direction, the moving contact unit moves relative to the accommodating part along the Y-axis direction and includes a dynamic contact group corresponding to the static contact group, the dynamic contact group includes a dynamic contact, and the dynamic contact is provided with two moving contacts along the X-axis direction, and the two moving contacts can contact or move away from the corresponding static contacts along the Y-axis direction, wherein the Y-axis direction is perpendicular to the X-axis direction; the guide part is fixedly connected to the accommodating part and is located in the middle of the two moving contacts along the X-axis direction; the guide part only slides with the moving contact unit along a straight line, and the straight line extends along the Y-axis direction.

[0009] The second technical solution is based on the first technical solution, wherein the movable contact is further provided with a current-passing bridge, the current-passing bridge extends along the X-axis direction, and the two movable contacts are fixedly connected to the current-passing bridge.

[0010] The third technical solution is based on the second technical solution, wherein the first projection of the guide member on the first projection plane intersects with the second projection of the dynamic contact member on the first projection plane, the first projection plane is perpendicular to the Z-axis direction, and the Z-axis direction is perpendicular to the Y-axis direction and the X-axis direction.

[0011] The fourth technical solution is based on the second technical solution, wherein the guide member is located in the middle of the dynamic contact unit along the Z-axis direction.

[0012] The fifth technical solution is based on the third technical solution, wherein the guide member extends along the Y-axis direction and passes through the movable contact unit.

[0013] The sixth technical solution is based on the fourth technical solution, wherein both ends of the guide member are fixedly connected to the accommodating member.

[0014] The seventh technical solution is based on the fifth technical solution, wherein the dynamic contact unit also includes a pushing member, an elastic bracket and a limiting member; the elastic bracket and the limiting member both correspond to the dynamic contact member group; the elastic bracket is located between the pushing member and the dynamic contact member group along the Y-axis direction; the limiting member is fixed relative to the pushing member and abuts against the dynamic contact member along the Y-axis direction when the dynamic contact member is away from the two static contacts to limit the distance between the dynamic contact member and the static contact member group.

[0015] The eighth technical solution is based on the seventh technical solution, wherein the dynamic contact unit further includes a connecting part, which corresponds to the limiting part and is integrally injection-molded with the pushing part insert, and the pushing parts are extended from both ends of the connecting part along the Z-axis direction, and the limiting part is fixedly connected to both ends of the connecting part.

[0016] The ninth technical solution is based on the seventh technical solution, wherein the number of the dynamic contacts in the dynamic contact group is more than two, and the more than two dynamic contacts are arranged along the Z-axis direction.

[0017] The tenth technical solution is based on the ninth technical solution, wherein the electrically controlled part further includes a first magnetic conductive group, and the moving contact unit further includes a second magnetic conductive group; the first magnetic conductive group corresponds to the static contact group and is fixed relative to the static contact group, and the second magnetic conductive group corresponds to the moving contact group and is fixed relative to the moving contact group; when the moving contact contacts two static contacts, the second magnetic conductive group approaches or abuts the first magnetic conductive group along the Y-axis direction, so that the first magnetic conductive group and the second magnetic conductive group form a magnetic circuit based on the current passing through the moving contact.

[0018] The eleventh technical solution is based on the tenth technical solution, wherein the second magnetic conductor group includes second magnetic conductors, and the number of the second magnetic conductors is the same as and corresponds to the moving contacts in the corresponding moving contact group; the second magnetic conductor is provided with a main body and an extension part, the main body is fixed to the back of the overcurrent bridge and extends along the Z-axis direction, and the extension part extends from both ends of the main body along the Z-axis direction along the Y-axis direction toward the first magnetic conductor group.

[0019] The twelfth technical solution is based on the eleventh technical solution, wherein the number of moving contacts in the moving contact group is two, the guide member is located between the current bridges of the two moving contacts along the Z-axis direction, and in the second magnetic conductor, the extension portion close to the guide member along the Z-axis direction is provided with a first part and a second part along the X-axis direction, the first part and the second part are spaced apart along the X-axis direction, and the guide member passes through the gap between the first part and the second part.

[0020] The thirteenth technical solution is based on the twelfth technical solution, wherein the first magnetic conductor group includes a first magnetic conductor, the first magnetic conductor is fixed to the accommodating part, the first magnetic conductor extends along the Z-axis direction and is located between two static contact parts along the X-axis direction; the guide part passes through the first magnetic conductor.

[0021] The fourteenth technical solution is based on the thirteenth technical solution, wherein the accommodating member is provided with two blocking parts, and the two blocking parts are respectively located on both sides of the first magnetic conductor along the X-axis direction and between the two static contacts.

[0022] The fifteenth technical solution is based on any one of the seventh to fourteenth technical solutions, wherein, in the dynamic contact unit, the fitting clearance between the limiting member and the guide member is the smallest.

[0023] The sixteenth technical solution is based on the seventh technical solution, and further includes an elastic member, which elastically abuts against the pushing member and stores energy when the moving contact moves away from the static contact group, and releases energy when the moving contact moves toward the static contact group.

[0024] The seventeenth technical solution is based on the sixteenth technical solution, wherein the guide member is provided with a protrusion at a position away from the static contact member group, and the elastic member is sleeved on the guide member, with one end thereof abutting against the protrusion and the other end elastically abutting against the pushing member.

[0025] The eighteenth technical solution is based on the sixteenth technical solution, wherein, when the movable contact contacts two static contacts along the Y-axis direction, the elastic member applies an elastic force toward the static contact group to the movable contact unit.

[0026] The nineteenth technical solution is based on the seventh technical solution, which also includes a separator group. The separator group corresponds to the static contact group and is provided with two separators. The two separators are fixed to the accommodating part and are located on both sides of the static contact group along the X-axis direction. The separators are made of high-temperature resistant insulating material.

[0027] The twentieth technical solution is based on the seventh technical solution, which also includes a driving part, which is used to drive the moving contact unit to move along the Y-axis direction and includes a magnetic circuit unit, and the magnetic circuit unit includes a coil assembly and an armature assembly. The coil assembly is fixed to the accommodating part and drives the armature assembly to rotate around a first rotating axis extending along the Z-axis direction; the output end of the driving part abuts against the pushing member along the Y-axis direction to convert the rotation of the armature assembly into linear motion of the pushing member along the Y-axis direction.

[0028] The twenty-first technical solution is based on the twentieth technical solution, wherein the magnetic circuit unit and the dynamic contact unit are arranged at intervals along the X-axis direction.

[0029] The twenty-second technical solution is based on the twentieth technical solution, wherein the driving part also includes a rotating member, which rotates around a second rotating axis extending along the Z-axis direction and is provided with a first end and a second end on both sides of the second rotating axis, and the second end is the output end of the driving part; the armature assembly is provided with two first abutting surfaces opposite to or opposite to each other, and the first end can abut against the two first abutting surfaces; the pushing member is provided with two second abutting surfaces opposite to or opposite to each other along the Y-axis direction, and the second end can abut against the two second abutting surfaces.

[0030] The twenty-third technical solution is based on the twenty-second technical solution, wherein the pushing member is provided with a pushing cavity, two second abutting surfaces are arranged on two opposite walls of the pushing cavity along the Y-axis direction, the second end portion extends into the pushing cavity and is provided with two protrusions along the Z-axis direction, the two protrusions are arranged at intervals along the Z-axis direction, and the guide member passes through the interval between the two protrusions.

[0031] The twenty-fourth technical solution is based on the twenty-second technical solution, wherein, when the dynamic contact contacts two static contacts, the projection of the contact point between the second end portion and the second abutting surface on the first projection surface is located within the first projection.

[0032] The twenty-fifth technical solution is based on the twenty-second technical solution. When the dynamic contact contacts and moves away from the corresponding static contact along the Y-axis direction, the positions where the second end portion and the two second abutting surfaces respectively abut are located on the same straight line extending along the Y-axis direction.

[0033] The twenty-sixth technical solution is based on the twenty-second technical solution, and further includes a micro switch, wherein the micro switch is provided with a dynamic spring, and the pushing member, the rotating member or the armature assembly can push against the dynamic spring to turn the micro switch on or off.

[0034] The twenty-seventh technical solution relates to an electric meter, which includes the relay described in any one of the first to twenty-sixth technical solutions.

[0035] Compared with the prior art, the above solution has the following beneficial effects:

[0036] In the prior art, guide members are arranged on both sides of the pusher along the X-axis direction. After observation, experimentation and research, the applicant found that the reason why the coil assembly of the relay in the prior art consumes a lot of energy is that once the two guide members arranged along the X-axis direction are not parallel to each other, the pusher is prone to jamming when moving linearly along the Y-axis direction. Therefore, the driving part outputs a greater driving force to drive the pusher to switch positions. In order to output a greater driving force, the coil assembly consumes a lot of energy. In the first technical solution, the guide member only slides with the moving contact unit along a straight line L, and the straight line L extends along the Y-axis direction. Therefore, the sliding cooperation between the moving contact unit and the guide member is only on the straight line L, and there will be no jamming due to the two guide members not being parallel to each other. Therefore, the driving part needs to output a smaller driving force than the prior art, and the energy consumption of the coil assembly is lower than that of the prior art. The guide is set to be located in the middle of the two moving contacts along the X-axis direction. When the moving contact collides with the static contact group in a posture that is tilted relative to the X-axis direction, the reaction force of the static contact group on the moving contact will form a corrective torque centered on the position of the guide. This corrective torque can automatically correct the posture of the moving contact, so that the two moving contacts of the moving contact remain arranged along the X-axis direction, and thus the two moving contacts can apply the same force to the corresponding static contact.

[0037] In the prior art, guides are located on either side of the pusher along the X-axis. The movable contact extends in this direction, so the guides need to be placed outside the movable contact along the X-axis. This increases the relay's X-axis dimensions, making the structure less compact and occupying a larger space. In the first technical solution, the guide is located between the two movable contacts along the X-axis, reducing the relay's X-axis dimensions. This results in a more compact structure and a smaller footprint.

[0038] In the first technical solution, the guide member is in sliding cooperation with the movable contact unit, which can be interpreted as sliding cooperation with the movable contact member, and can also be interpreted as sliding cooperation with other parts of the movable contact unit.

[0039] The second technical solution is a specific implementation method of the first technical solution. The overcurrent bridge extends along the X-axis direction, and the two moving contacts are fixed to the overcurrent bridge. At this time, the safety distance between the moving contact and the static contact group of the relay is twice the actual distance between the moving contact and the static contact group. Therefore, the relay has higher safety and stronger voltage resistance.

[0040] In the third technical solution, the first projection and the second projection intersect, so the guide member can guide the movable contact member throughout the entire movement path of the movable contact member, which is more conducive to improving the stability of the movement of the movable contact member.

[0041] In the fourth technical solution, the guide member is located in the middle of the moving touch unit along the Z-axis direction, which can better guide the moving touch unit, making it less likely to deflect up and down, and improving the stability of the moving touch unit's movement.

[0042] In the fifth technical solution, the guide member passes through the moving contact unit along the Y-axis direction. Therefore, the guide member not only has a guiding function along the Y-axis direction, but can also position the moving contact unit in the direction perpendicular to the Y-axis direction (i.e., the X-axis direction and the Z-axis direction), so that the relative position of the moving contact and the two static contacts is more certain, the contact is more reliable, the contact resistance is smaller, and the heat generated by the relay is smaller.

[0043] In the sixth technical solution, both ends of the guide member along the Y-axis direction are fixed to the accommodating member, which can leave more sufficient space for the movable contact unit and the movement of the movable contact unit along the Y-axis direction.

[0044] In the seventh technical solution, an elastic bracket is disposed between the pusher and the movable contact assembly. This bracket provides an elastic force toward the stationary contact assembly after the movable contact unit experiences overtravel, allowing the movable contact to better contact the two stationary contacts. It also generates additional repulsive force when the movable contact is separated from the stationary contact assembly, helping the movable contact to move away from the stationary contact assembly. By providing a limiter, the distance between the movable contact and the stationary contact assembly can be ensured to meet design requirements.

[0045] In the eighth technical solution, the connecting member and the pushing member are insert-molded as one piece, so that the limiting member is easier to fix relative to the pushing member, and the limiting member has stronger rigidity and better limiting effect on the dynamic contact member.

[0046] In the ninth technical solution, there are two or more moving contacts, each capable of contacting two stationary contacts. Therefore, each moving contact connects in parallel when contacting two stationary contacts, increasing the relay's load capacity and reducing the contact resistance between the moving and stationary contacts. The moving contacts are arranged along the Z-axis, while the moving contacts extend along the X-axis and move along the Y-axis. This allows the relay to fully utilize space in all directions, resulting in a more compact structure and a smaller footprint.

[0047] In the tenth technical solution, the first magnetic conductive group is relatively fixed to the static contact group, and the second magnetic conductive group is relatively fixed to the moving contact group. The first magnetic conductive group and the second magnetic conductive group form a magnetic circuit when current flows through the moving contact, so that a magnetic attraction force is formed between the first magnetic conductive group and the second magnetic conductive group. When the relay is impacted by a large fault current, the moving contact group and the static contact group are not easy to disengage, thereby avoiding the generation of destructive arcs that cause damage to the relay.

[0048] In the eleventh technical solution, the number of the second magnetic conductors is the same as the number of the moving contacts in the moving contact group, so a magnetic circuit can be formed around each moving contact, making it difficult for each moving contact to be separated from the static contact group.

[0049] In the twelfth technical solution, the guide member is positioned along the Z-axis between the current bridges of the two movable contacts. This ensures that the guide member provides uniform guidance to each movable contact along the Z-axis, preventing the movable contacts from tilting upward or downward. The guide member passes through the gap between the first portion and the second portion. This not only allows the second magnetic conductor to yield to the guide member, but also allows for the formation of magnetic circuits on both sides of the guide member along the X-axis, ensuring magnetic efficiency and ensuring that the movable contacts are subjected to uniform forces on both sides of the guide member along the X-axis, further preventing the movable contacts from tilting left or right.

[0050] In the thirteenth technical solution, the first magnetic conductor group is provided with the first magnetic conductor, which is more convenient to install. The guide member passes through the first magnetic conductor, which can ensure the relative position of the first magnetic conductor, the guide member and the accommodating member.

[0051] In the fourteenth technical solution, a barrier portion is provided on the accommodating member to separate the first magnetic conductor from the static contacts on both sides, so that the two static contacts are not easily short-circuited through the first magnetic conductor located in the middle.

[0052] In the fifteenth technical solution, the clearance between the guide and the limiter is minimized, enabling the guiding effect of the guide to be most pronounced at the limiter along the Y-axis. Furthermore, since the movable contact moves synchronously with the limiter before overtravel, the guiding effect of the guide at the limiter can be directly fed back to the movable contact, effectively guiding the movable contact. Furthermore, the clearance between the remaining portions of the movable contact unit and the guide is larger than that between the limiter and the guide, allowing the movable contact unit to have a certain degree of freedom in positions other than the limiter along the Y-axis. Even slight deflections can be corrected by the guiding effect of the guide on the limiter, ensuring that the movable contact maintains the correct posture when contacting the two stationary contacts. Furthermore, when the movable contact contacts the stationary contact group with a posture deflected relative to the X-axis, the movable contact can more easily automatically correct its posture based on the reaction force of the stationary contact group on the movable contact. What is particularly important is that when the pusher is driven by the swinging magnetic circuit unit to move linearly along the Y-axis direction, and the radial component of the rotation of the armature assembly acts on the pusher through friction, by allowing the moving contact unit to have a certain degree of freedom in the position in the Y-axis direction except for the limit member, the moving contact unit is allowed to be slightly deflected, which can further avoid the above-mentioned friction force causing the moving contact unit to get stuck in the Y-axis direction.

[0053] In the sixteenth technical solution, the elastic member stores energy due to deformation when the moving contact group moves in the direction away from the static contact group and releases energy due to recovery of deformation when the moving contact group moves in the direction close to the static contact group. This can better help the moving contact unit start from a position away from the static contact group and approach the static contact group, which is beneficial to increasing the movement stroke of the moving contact, and therefore also beneficial to increasing the safety distance between the moving contact and the static contact group.

[0054] In the seventeenth technical solution, the elastic member is sleeved on the guide member, one end of the elastic member abuts against the protrusion, and the other end elastically abuts against the pushing member, so the structure is more compact and occupies less space.

[0055] In the eighteenth technical solution, when the moving contact contacts the two static contacts along the Y-axis direction, the elastic member applies an elastic force toward the static contact group to the moving contact unit, which can improve the stability of the moving contact and the two static contacts in the closed state, and further improve the short-circuit resistance, that is, improve the ability of the moving contact to avoid disengagement from the static contact when the relay is subjected to a large fault current.

[0056] Since the current directions of the two moving contacts are opposite, when the moving contact is disconnected from the static contact assembly, the arc generated between the two moving contacts and the corresponding static contacts will propagate outward along the X-axis due to the repulsive Lorentz magnetic force.

[0057] In the nineteenth technical solution, by arranging separators on both sides of the static contact group along the X-axis direction, and the separators are made of high-temperature resistant insulating materials, it is possible to prevent the arc overflowing laterally from damaging other parts of the relay.

[0058] The twentieth technical solution is a specific implementation method using a swinging magnetic circuit unit. The use of a swinging magnetic circuit unit is compact, helping to reduce the size of the relay. Furthermore, the use of a swinging magnetic circuit unit can effectively amplify the tangential motion stroke of the armature assembly, which helps to increase the safe distance between the moving and stationary contacts. The closed magnetic circuit formed between the coil assembly and the armature assembly reduces magnetic loss and magnetic resistance, thus eliminating the need for a large magnetic circuit unit and further helping to reduce the size of the relay.

[0059] In the twenty-first technical solution, the magnetic circuit unit and the moving contact unit are spaced apart along the X-axis direction, which can prevent the relay from being too large in the movement direction of the moving contact unit (Y-axis direction), so the structure is more compact and occupies less space; at the same time, it can prevent the magnetic circuit unit from affecting the linear movement of the moving contact unit along the Y-axis direction, thereby ensuring a larger safety distance between the moving contact and the static contact.

[0060] In the twenty-second technical solution, the tangential component of the movement of the armature assembly is transmitted to the pushing member through the rotating member. On the one hand, it is convenient to adjust the spacing between the magnetic circuit unit and the moving contact unit along the X-axis direction. On the other hand, compared with the technical solution of directly extending the swing arm from the armature assembly, the ratio of the resistance arm to the power arm is smaller, and the required magnetic driving force is smaller, which helps to reduce the volume of the magnetic circuit unit and the relay.

[0061] In the twenty-third technical solution, the second end extends into the pushing cavity, which can make the pusher and the rotating member fit more compactly. By providing two protrusions spaced apart along the Z-axis direction, the guide member can be made to give way.

[0062] In the twenty-fourth technical solution, when the dynamic contact member contacts the two static contacts, the projection of the contact point between the second end portion and the second abutting surface on the first projection surface is located within the first projection, which means that when the dynamic contact member contacts the two static contacts, the force point of the dynamic contact unit is within the width range of the guide member, so the dynamic contact unit will not generate a deflection torque, and can ensure that the dynamic contact member correctly abuts the two static contacts along the Y-axis direction.

[0063] In the twenty-fifth technical solution, when the moving contact contacts and moves away from the corresponding static contact along the Y-axis direction, the positions where the second end portion abuts against the two second abutting surfaces are located on the same straight line extending along the Y-axis direction. In this way, the movement path of the second end portion is a circular arc path that is symmetrical about the surface perpendicular to the Y-axis direction and passing through the second rotation axis. The movement component formed by the second end portion in the radial direction is small. Therefore, the deflection that may be generated by the pushing member and the entire moving contact unit is small, thereby avoiding the situation where the moving contact unit is stuck with the guide member due to the need to move relative to the Y-axis direction, and reducing the friction between the moving contact unit and the second end portion, and is conducive to reducing the volume of the magnetic circuit unit and the relay.

[0064] In the twenty-sixth technical solution, a microswitch is provided to transmit the relay status to an external relay status sensing circuit. Furthermore, the microswitch's spring provides thrust for the moving contact unit to move closer to the static contact group, allowing the moving contact to close more quickly with the two static contacts.

[0065] The electric meter in the twenty-seventh technical solution has the technical effects corresponding to the technical solution it references. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[0067] FIG1 is an exploded perspective view of a relay according to an embodiment of the present disclosure;

[0068] FIG2 is a top view of the housing and the guide member in an embodiment of the present disclosure;

[0069] FIG3 is a cross-sectional view along line AA in FIG2 ;

[0070] FIG4 is a top view of a relay in an embodiment of the present disclosure;

[0071] FIG5 is a cross-sectional view along line BB in FIG4 ;

[0072] FIG6 is a schematic structural diagram of the electronic control part in an embodiment of the present disclosure;

[0073] FIG7 is a perspective view of the first magnetic conductive group in an embodiment of the present disclosure;

[0074] FIG8 is a perspective view of a pushing member and a connecting member in an embodiment of the present disclosure;

[0075] FIG9 is an exploded perspective view of the movable contact assembly, the second magnetic conductive assembly, and the elastic bracket according to an embodiment of the present disclosure;

[0076] FIG10 is a perspective view of a position limiting member in an embodiment of the present disclosure;

[0077] FIG11 is a front view of the electronic control part in the embodiment of the present disclosure;

[0078] FIG12 is a cross-sectional view taken along line CC in FIG11;

[0079] FIG13 is a top view of the driving portion when the relay is in an off state according to an embodiment of the present disclosure;

[0080] FIG14 is a top view of the driving portion when the relay is in the on state according to an embodiment of the present disclosure;

[0081] FIG15 is a perspective view of a rotating member in an embodiment of the present disclosure;

[0082] FIG16 is a perspective view of a micro switch according to an embodiment of the present disclosure;

[0083] FIG17 is a schematic diagram of the internal structure of the relay in the off state according to an embodiment of the present disclosure;

[0084] FIG18 is a cross-sectional view along line DD in FIG17;

[0085] FIG19 is a schematic diagram of the internal structure of the relay in the on state according to the embodiment of the present disclosure;

[0086] FIG20 is a cross-sectional view along line EE in FIG19;

[0087] FIG21 is a cross-sectional view taken along line FF in FIG19 .

[0088] Description of the main reference numerals: 1. Relay; 2. Accommodating member; 3. Guide member; 4. Electric control part; 5. Elastic member; 6. Separator assembly; 7. Driving part; 8. Micro switch; 9. Shielding cover; 91. Shielding wall; 92. Connecting wall; 10. Housing; 11. Cover; 12. Slot; 13. Groove; 14. First shaft hole; 15. Second shaft hole; 16. Blocking part; 17. Pressing part; 18. Protrusion; 19. Static contact group; 20. First magnet group; 21. Moving contact unit; 22. Static contact; 23. Static contact point; 24. First magnet; 25. Magnetic body; 26. Inserting part; 27. First hole; 28. Pushing member; 29. ​​Connecting member; 30. Moving contact group; 31. Second magnet group; 32. Elastic bracket; 33. Limiting member; 34. Pushing cavity; 35. Second abutting surface; 36. Second hole; 37. Connecting column; 38. Connecting Connecting end; 39. Third hole; 40. Moving contact; 41. Overcurrent bridge; 42. Moving contact; 43. Second magnetic conductor; 44. Main body; 45. Extension portion; 46. First part; 47. Second part; 48. Frame; 49. Elastic support portion; 50. Fourth hole; 51. Connecting hole; 52. Elastic arm; 53. Limiting portion; 54. Connecting portion; 55. Fifth hole; 56. Avoidance hole; 57. Assembly hole; 58. Partition; 59. Magnetic circuit unit; 60. Rotating member; 61. Coil assembly; 62. Armature assembly; 63. First rotating shaft; 64. Connecting groove; 65. First abutting surface; 66. Second rotating shaft; 67. First end portion; 68. Second end portion; 69. Pushing portion; 70. Protruding portion; 71. Moving spring. DETAILED DESCRIPTION

[0089] In the claims and the specification, except in the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" simply refer to the fact that features having one of these directions are perpendicular to features having another direction, and do not require that they be implemented in accordance with the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. The X-axis direction can be divided into left and right, the Y-axis direction can be divided into front and back, and the Z-axis direction can be divided into up and down.

[0090] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0091] In the claims and the specification, unless otherwise specified, the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are based on the directions and positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description, and do not imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction.

[0092] In the claims and the specification, unless otherwise specified, the terms "fixed connection", "fixed connection" or "relatively fixed" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship or relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0093] In the claims and the description, unless otherwise defined, the terms "include", "have" and their variations mean "including but not limited to".

[0094] In the claims and the description, unless otherwise defined, the term "provided with" means that the technical feature thereafter is part of the technical feature therefor.

[0095] In the claims and description, unless otherwise specified, the term "group" means a collection, which may include one element or multiple elements, unless otherwise specified. For example, a "moving contact group" may include one moving contact or more than two moving contacts.

[0096] In the claims and description, unless otherwise specified, the term "the guide member slides with the moving contact unit only along a straight line" means that when there is only one guide member, the guide member extends along the Y-axis direction; and when there are more than two guide members, each guide member is arranged only along the Y-axis direction.

[0097] The technical solutions in the embodiments will be described clearly and completely below with reference to the accompanying drawings.

[0098] Relay 1 is used to receive electrical signals to control the on / off state of an external circuit. Specifically, in this embodiment, relay 1 is a latching relay that controls the on / off state of the external circuit by receiving pulsed electrical signals. In this embodiment, the external circuit is single-phase alternating current (AC). Relay 1 controls the on / off state of this single-phase AC power.

[0099] Referring to Figure 1 , which shows the structure of a relay 1 according to an embodiment of the present disclosure, the relay 1 includes a receiving member 2, a guide member 3, an electric control portion 4, an elastic member 5, a separator assembly 6, a driving portion 7, a micro switch 8, and a shielding cover 9.

[0100] Referring to Figures 1 to 5 , they illustrate a container 2 in an embodiment of the present disclosure. This container 2 houses a guide member 3, an electrical control unit 4, an elastic member 5, a separator assembly 6, a drive unit 7, a microswitch 8, and a shield 9. The container 2 is made of an insulating material, such as plastic injection molding in this embodiment.

[0101] As shown in FIG. 1 , the container 2 includes a shell 10 and a cover 11 .

[0102] The shell 10 is used to accommodate and install the guide member 3, the electric control part 4, the elastic member 5, the partition group 6, the drive part 7, the micro switch 8 and the shielding cover 9. As shown in Figure 2, the shell 10 is provided with a cavity that opens upward. The cavity can be divided into a left cavity and a right cavity. The left cavity is provided with slots 12 at the front and rear ends along the Y-axis direction. The slots 12 are open upward and are used to install the guide member 3. A groove 13 is also provided behind the slot 12 at the front end of the left cavity. As shown in Figure 3, the groove 13 is located on the bottom wall of the shell 10. The groove 13 is used to install the first magnetic conductive group 20 (which will be described in detail later).

[0103] As shown in Figure 2, a first rotation axis hole 14 is provided in the middle of the right chamber, and a second rotation axis hole 15 is provided in the middle of the chamber. Two baffles 16 are provided on the left and right sides of the groove 13 along the X-axis, extending along the Z-axis. A space is defined between the two baffles 16 for mounting the first magnetic conductor assembly 20.

[0104] As shown in Figure 5, the cover 11 is used to cover the opening of the housing 10 and is fixedly connected to the housing 10. In this embodiment, the cover 11 is snap-fitted to the housing 10. The cover 11 is provided with two pressing portions 17 at positions corresponding to the two slots 12 of the housing 10. The pressing portions 17 extend downward from the cover 11, that is, toward the housing 10, and are used to press the ends of the guide member 3 installed in the slots 12, thereby fixing the guide member 3 relative to the receiving member 2.

[0105] Refer to Figure 2, which shows the guide member 3 in this embodiment. The guide member 3 is used to provide motion guidance for the moving contact unit 21 (described in detail later) in the electronic control part 4, so that the moving contact unit 21 moves along the Y-axis direction. In this embodiment, the guide member 3 is made of metal. In this embodiment, the guide member 3 can be in the shape of a rod and extend only along a straight line L, and the straight line L extends along the Y-axis direction. The two ends of the guide member 3 are installed in the slot 12 from top to bottom and are pressed by the pressing part 17, so that the guide member 3 is fixed to the accommodating part 2. The rear part of the guide member 3 (away from the groove 13 along the Y-axis direction) is provided with a protrusion 18. The protrusion 18 is used for one end of the elastic member 5 to abut. In the present disclosure, when there are multiple guide members 3, they are also arranged only along the straight line L. For example, it is also allowed to divide the guide member 3 in this embodiment into two sections, one of which extends from front to back and the other extends from back to front.

[0106] 6 , which shows the electric control unit 4 in this embodiment. The electric control unit 4 is used to control the on / off of an external circuit. As shown in FIG6 , the electric control unit 4 includes a static contact assembly 19 , a first magnetic conductor assembly 20 , and a moving contact unit 21 .

[0107] Refer to Figure 6, which shows the static contact group 19 in this embodiment. As shown in Figure 6, the static contact group 19 is fixed to the accommodating part 2 and is used to electrically connect to the external circuit. The static contact group 19 includes two static contacts 22 arranged along the X-axis direction. One of the two static contacts 22 is used to connect to the power supply, and the other is used to connect to the load. Each static contact 22 is provided with a static contact 23, and the static contact 23 is arranged rearward along the Y-axis direction. Each static contact 22 is provided with two static contacts 23. The two static contacts 23 are arranged along the Z-axis direction. In this embodiment, the two blocking parts 16 are located between the two static contacts 22 along the X-axis direction.

[0108] Referring to Figures 5 to 7 , these illustrate the first magnet group 20 in this embodiment. The first magnet group 20 is disposed corresponding to the static contact group 19 . As shown in Figure 7 , the first magnet group 20 includes a first magnet 24 . The first magnet 24 comprises a magnet body 25 and an insertion portion 26 . The magnet body 25 extends along the Z-axis and is provided with a first hole 27 . The first hole 27 extends through the magnet body 25 along the Y-axis. The insertion portion 26 is located below the magnet body 25 along the Z-axis and extends downward. As shown in Figure 5 , the insertion portion 26 is inserted into the groove 13 to position the first magnet 24 along the X-axis and the Y-axis. The guide member 3 extends through the first hole 27 along the Y-axis. As shown in Figure 6 , the first magnet group 20 is located between the two baffles 16 along the X-axis. The first magnet 24 is also secured to the housing 10 by dispensing glue, thereby securing the first magnet group 20 and the static contact group 19 relative to each other.

[0109] Referring to Figure 6 , a movable contact unit 21 in this embodiment is shown. The movable contact unit 21 moves relative to the accommodating member 2 along the Y-axis. As shown in Figure 6 , the movable contact unit 21 includes a pusher 28 , a connector 29 , a movable contact assembly 30 , a second magnetic conductive assembly 31 , an elastic bracket 32 ​​, and a stopper 33 .

[0110] Refer to Figure 8, which shows the pushing member 28 and the connecting member 29 in this embodiment. As shown in Figure 8, the pushing member 28 is provided with a pushing cavity 34 at the rear portion along the Y-axis direction, and the pushing cavity 34 opens to the right along the X-axis direction. The two walls of the pushing cavity 34 that are opposite to each other along the Y-axis direction are provided with two second abutment surfaces 35, and the two second abutment surfaces 35 are arranged opposite to each other along the Y-axis direction. In other embodiments, the two second abutment surfaces 35 can also be arranged in a direction away from each other. The pushing member 28 is provided with a second hole 36 along the Y-axis direction, and the second hole 36 passes through the pushing member 28 along the Y-axis direction. The front surface of the pushing member 28 along the Y-axis direction is provided with two connecting posts 37, and the two connecting posts 37 are arranged along the Z-axis direction. The second hole 36 is located between the two connecting posts 37. The connecting post 37 extends forward along the Y-axis direction. The connecting member 29 and the pushing member 28 are insert-molded as one piece. The connecting member 29 extends along the Z-axis direction. The pusher 28 has two connection ends 38 formed at both ends of the connector 29 along the Z-axis, and the connection ends 38 protrude from the pusher 28. A third hole 39 (shown in FIG. 12 ) is further defined in the middle of the connector 29 along the Z-axis. The third hole 39 passes through the connector 29 along the Y-axis and communicates with the second hole 36.

[0111] Referring to Figure 9 , FIG9 illustrates the movable contact assembly 30, the second magnetic conductor assembly 31, and the elastic bracket 32 ​​in this embodiment. As shown in FIG9 , the movable contact assembly 30 is arranged corresponding to the stationary contact assembly 19. The movable contact assembly 30 includes two movable contacts 40. In this embodiment, there are two movable contacts 40 in the movable contact assembly 30, spaced apart along the Z-axis. Each movable contact 40 includes a current bridge 41 and two movable contacts 42. The current bridge 41 extends along the X-axis. The two movable contacts 42 are fixedly connected to the current bridge 41 and arranged along the X-axis. The two movable contacts 42 can contact or move away from their corresponding stationary contacts 22 along the Y-axis. In this embodiment, the movable contacts 42 and the stationary contacts 23 are arranged correspondingly along the Y-axis. When the movable contacts 42 move away from their corresponding stationary contacts 23 along the Y-axis, the movable contacts 40 move away from the two stationary contacts 22, preventing electrical conduction between the two stationary contacts 22, and the external circuit is disconnected. When the movable contact 42 contacts the corresponding stationary contact 23 along the Y-axis direction, the movable contact 40 contacts the two stationary contacts 22 , the two stationary contacts 22 are electrically connected through the movable contact 40 , and the external circuit is turned on.

[0112] As shown in Figure 9, the second magnetic conductor group 31 is arranged corresponding to the movable contact group 30. The second magnetic conductor group 31 includes two second magnetic conductors 43, which are arranged corresponding to the two movable contacts 40. Specifically, each second magnetic conductor 43 includes a main body 44 and two extensions 45. The main body 44 extends along the Z-axis direction and is fixed to the back of the current bridge 41 of the corresponding movable contact 40. The two extensions 45 extend from both sides of the main body 44 along the Z-axis direction toward the first magnetic conductor group 20 along the Y-axis direction. In this embodiment, of the two extensions 45 of each second magnetic conductor 43, the extension 45 adjacent to the other second magnetic conductor 43 includes a first portion 46 and a second portion 47 along the X-axis direction, and the first portion 46 and the second portion 47 are spaced apart along the X-axis direction. As shown in Figure 6, when the movable contact 40 contacts the two static contacts 22, the extensions 45 approach or abut the first magnetic conductor group 20.

[0113] As shown in Figure 9, the elastic bracket 32 ​​is disposed in correspondence with the movable contact assembly 30. The elastic bracket 32 ​​includes a frame body 48 and two elastic support portions 49. A fourth hole 50 is defined in the middle portion of the frame body 48 along the Z-axis. Two connecting holes 51 are defined in the frame body 48 along the Z-axis. The fourth hole 50 is located between the two connecting holes 51 along the Z-axis. The two connecting holes 51 are adapted to accommodate the corresponding connecting posts 37. The two elastic support portions 49 are disposed in correspondence with the two movable contacts 40 in the movable contact assembly 30. The two elastic support portions 49 are arranged along the Z-axis. Each elastic support portion 49 includes two elastic arms 52, which extend from opposite sides of the frame body 48 along the X-axis and are at least partially angled away from the pusher 28 along the Y-axis. The free ends of the two elastic arms 52 (i.e., the ends facing away from the frame body 48 along the X-axis) are respectively secured to the back surface of the overcurrent bridge 41. The locations of the securement to the overcurrent bridge 41 are located on the back surfaces of the two movable contacts 42 along the Y-axis.

[0114] Refer to Figure 10, which shows the limiting member 33 in this embodiment. The limiting member 33 is provided corresponding to the connecting member 29. As shown in Figure 10, the limiting member 33 includes a limiting portion 53 and two connecting portions 54. The limiting portion 53 extends along the Z-axis direction and is perpendicular to the Y-axis direction. A fifth hole 55 is provided in the middle of the limiting portion 53. The fifth hole 55 passes through the limiting portion 53 along the Y-axis direction. The limiting portion 53 is also provided with an avoidance hole 56 for each extension portion 45 of the second magnetic conductive body group 31 to extend along the Y-axis direction. The connecting portion 54 extends backward along the Y-axis direction from both ends of the limiting portion 53 along the Z-axis direction. Each connecting portion 54 is provided with an assembly hole 57, and the assembly hole 57 is adapted to and can be fixed to the connecting end 38 of the connecting member 29.

[0115] Referring to Figures 11 to 12, Figures 11 to 12 show the moving contact unit 21, the guide member 3 and the elastic member 5 in this embodiment. As shown in Figure 11, the guide member 3 is located between the first portion 46 and the second portion 47 of the same extension portion 45 along the X-axis direction. The guide member 3 is also located between the overcurrent bridges 41 of the two moving contacts 40 of the same moving contact group 30 along the Y-axis direction. The guide member 3 is located in the middle of the two moving contacts 42 along the X-axis direction, and the first projection of the guide member 3 on the first projection plane perpendicular to the Z-axis direction intersects with the second projection of the moving contact 40 on the first projection plane. In this embodiment, the portion where the first projection intersects the second projection is in the middle of the second projection along the X-axis direction. The guide member 3 is also located in the middle of the moving contact unit 21 along the Z-axis direction.

[0116] As shown in Figure 12, in this embodiment, the connecting posts 37 are correspondingly inserted into the connecting holes 51, and the movable contact 40 is fixed to the elastic support portion 49 of the elastic bracket 32, so that the elastic bracket 32 ​​is located between the pusher 28 and the movable contact assembly 30 along the Y-axis direction. When the movable contact 40 contacts the two static contacts 22, energy is stored, and when the movable contact 40 moves away from the two static contacts 22, energy is released. In this embodiment, the two assembly holes 57 of the limiter 33 are adapted to and fixedly connected to the corresponding two connecting ends 38, so that the limiter 33 is fixed relative to the pusher 28. When the movable contact 40 moves away from the two static contacts 22, the limiting portion 53 of the limiter 33 abuts the current bridge 41 of the two movable contacts 40 along the Y-axis direction to limit the distance between the movable contact 40 and the static contact assembly 19.

[0117] As shown in Figure 12, in this embodiment, the guide member 3 penetrates the movable contact unit 21 along the Y-axis direction and slides with the movable contact unit 21 along the straight line L. Specifically, the guide member 3 passes through the second hole 36 and the pushing cavity 34 of the pushing member 28, the third hole 39 of the connecting member 29, the fourth hole 50 of the elastic bracket 32, the gap between the first portion 46 and the second portion 47 of the two extensions 45, the gap between the two current bridges 41 of the two movable contacts 40, and the fifth hole 55 of the limiting member 33. In this embodiment, the clearance between the fifth hole 55 and the guide member 3 is smaller than the clearance between the second hole 36, the third hole 39, and the fourth hole 50 and the guide member 3.

[0118] As shown in Figure 12, in this embodiment, the elastic member 5 is a spring. One end of the elastic member 5 abuts against the protrusion 18, and the other end of the elastic member 5 abuts against the pusher 28. The elastic member 5 stores energy when the movable contact 40 moves away from the static contact assembly 19, and releases energy when the movable contact 40 moves toward the static contact assembly 19.

[0119] Referring to Figure 1 , FIG1 illustrates the separator assembly 6 in this embodiment. As shown in FIG1 , the separator assembly 6 is disposed corresponding to the static contact assembly 19 . The separator assembly 6 includes two separators 58 . The two separators 58 are affixed to the accommodating member 2 and positioned on either side of the static contact assembly 19 along the X-axis. Each separator 58 is in the form of a sheet extending perpendicular to the X-axis and is made of a high-temperature resistant insulating material, such as ceramic.

[0120] 13 to 15 , which illustrate the driving portion 7 in this embodiment. The driving portion 7 is used to drive the movable contact unit 21 to linearly move along the Y-axis. As shown in FIG13 , in this embodiment, the driving portion 7 includes a magnetic circuit unit 59 and a rotating member 60 .

[0121] As shown in Figure 13, the magnetic circuit unit 59 includes a coil assembly 61 and an armature assembly 62. The coil assembly 61 is fixed to the housing 10 and is provided with two magnetic drive ends. The coil assembly 61 reverses the polarity temporarily formed by the two magnetic drive ends by receiving a pulse electrical signal. In this embodiment, the two magnetic drive ends are arranged along the Y-axis direction. The armature assembly 62 rotates around the first rotating shaft 63, and the first rotating shaft 63 extends along the Z-axis direction. The magnetic circuit unit 59 in this embodiment is a swinging magnetic circuit unit with a magnetic holding function in the prior art. Its structure is well known to technicians in the relevant technical field and will not be repeated here. In this embodiment, the armature assembly 62 is also provided with a connecting groove 64, and the connecting groove 64 has two first abutting surfaces 65 opposite to each other. The connecting groove 64 is provided with an opening radially away from the coil assembly 61. In other embodiments, the two first abutting surfaces 65 can also be arranged in a direction away from each other.

[0122] As shown in FIG13 , the rotating member 60 rotates about a second rotating shaft 66 extending in the Z-axis direction. The rotating member 60 is provided with a first end 67 and a second end 68 on either side of the second rotating shaft 66. The first end 67 extends from the opening of the connecting groove 64 into the connecting groove 64 and is capable of abutting the two first abutting surfaces 65. The second end 68 is the output end of the driving portion 7. In this embodiment, the power arm of the rotating member 60 is shorter than the resistance arm, which can convert the small rotation stroke of the armature assembly 62 into a large stroke and drive the movable contact unit 21 to move. While ensuring that a large contact gap can be achieved, the armature assembly 62 does not need to increase the magnetic gap and the overall volume of the magnetic circuit unit 59 due to the large rotation range.

[0123] It should be understood that in other embodiments, the movable contact unit 21 can also be driven by a swing arm (not shown) that extends directly from the side wall of the armature assembly 62. To ensure the strength of the directly extended swing arm, the outer wall of the swing arm at the connection point with the armature assembly 62 (i.e., the root of the swing arm) can be thickened to form a reinforcement portion to enhance the strength of the swing arm. In this embodiment, the rotating member 60 further has a rearward-facing push portion 69 between the second end portion 68 and the second rotating shaft 66.

[0124] Figure 13 shows the state of the driving portion 7 when the armature assembly 62 is rotated to the first rotational position. At this time, the first end 67 of the rotating member 60 is pushed by the first abutment surface 65 located at the rear, causing the rotating member 60 to rotate clockwise to the first position. Figure 14 shows the state of the driving portion 7 when the armature assembly 62 is rotated to the second rotational position. At this time, the first end 67 of the rotating member 60 is pushed by the first abutment surface 65 located at the front, causing the rotating member 60 to rotate counterclockwise to the second position. When the rotating member 60 is in the second position, the second end 68 is located further forward along the Y-axis direction than when the rotating member 60 is in the first position.

[0125] In this embodiment, when the movable contact 40 contacts and moves away from the corresponding stationary contact 22 along the Y-axis, the positions where the second end 68 and the two second abutting surfaces 35 respectively abut are located on the same straight line extending along the Y-axis. In other words, when the armature assembly 62 rotates to the first rotational position, the position where the second end 68 abuts the rearward second abutting surface 35 is the first position; when the armature assembly 62 rotates to the second rotational position, the position where the second end 68 abuts the forward second abutting surface 35 is the second position. The first and second positions are located on the same straight line extending along the Y-axis, which, in this embodiment, specifically coincides with line L.

[0126] As shown in FIG. 15 , the second end portion 68 is provided with two protrusions 70 along the Z-axis direction, and the two protrusions 70 are spaced apart along the Z-axis direction.

[0127] Referring to FIG. 16 , FIG. 16 shows the microswitch 8 in this embodiment. The microswitch 8 is used to connect to the relay state sensing circuit to transmit a relay state signal to the relay state sensing circuit. As shown in FIG. 16 , the microswitch 8 is provided with a dynamic spring 71. The right end of the dynamic spring 71 along the X-axis direction is connected to the base of the microswitch 8, and the left end of the dynamic spring 71 is elastically rotatable. When the left end of the dynamic spring 71 is pushed and approaches the base of the microswitch 8, the microswitch 8 is turned on, and the relay state sensing circuit senses that the relay 1 is in the off state. When the left end of the dynamic spring 71 is released and moves away from the base of the microswitch 8, the microswitch 8 is turned off, and the relay state sensing circuit senses that the relay 1 is in the on state. In this embodiment, the dynamic spring 71 is pushed by the pushing portion 69. In other embodiments, the dynamic spring 71 may also be pushed by the pusher 28 or the armature assembly 62.

[0128] Referring to Figures 1 and 4 , the shielding cover 9 in this embodiment is shown. As shown in Figure 1 , the shielding cover 9 has two shielding walls 91 perpendicular to the Z-axis and a connecting wall 92 connecting the two shielding walls 91. As shown in Figure 4 , the shielding cover 9 is positioned outside the accommodating member 2. Specifically, the shielding walls 91 of the shielding cover 9 are positioned above and below the magnetic circuit unit 59 along the Z-axis, and the connecting wall 92 of the shielding cover 9 is positioned to the right of the magnetic circuit unit 59 along the X-axis.

[0129] 17 to 21 , which show the internal structure of the relay 1 in this embodiment.

[0130] As shown in Figure 17, in this embodiment, the magnetic circuit unit 59 and the movable contact unit 21 are spaced apart on the left and right sides of the cavity along the X-axis. When the armature assembly 62 rotates to the first rotational position, the rotating member 60 rotates to the first position. At this time, the movable contact 40 is separated from the two static contacts 22, the relay 1 is in the off state, and the external circuit is shut off. At this time, the two separators 58 are arranged outside the movable contact 40 and the static contacts 22 along the X-axis. The pushing portion 69 pushes against the movable spring 71, causing the left end of the movable spring 71 to approach the base of the microswitch 8, turning the microswitch 8 on. The relay state sensing circuit detects that the relay 1 is in the off state.

[0131] As shown in Figure 18 , the second end 68 of the rotating member 60 extends into the push cavity 34 and abuts the two second abutment surfaces 35. The guide member 3 also passes through the gap between the two protrusions 70 along the Z-axis. When the armature assembly 62 rotates to the first rotational position, the second end 68 pushes rearward against the rear second abutment surfaces 35, compressing the elastic member 5 and storing energy.

[0132] As shown in Figure 19, when the armature assembly 62 rotates to the second rotation position, the rotating member 60 rotates to the second position. At this time, the dynamic contact 40 contacts the two static contacts 22, the relay 1 is in the on state, and the external circuit is turned on. At this time, the pushing portion 69 releases the dynamic spring 71, so that the left end of the dynamic spring 71 is away from the base of the micro switch 8, the micro switch 8 is turned off, and the relay state sensing circuit senses that the relay 1 is in the on state.

[0133] As shown in Figure 20 , the second end 68 of the rotating member 60 now presses forward against the second abutting surface 35, causing the elastic member 5 to stretch. However, in this embodiment, the elastic member 5 is still pre-compressed, meaning that the elastic member 5 still applies an elastic force to the movable contact unit 21 toward the static contact assembly 19. At this point, the projection of the contact point between the second end 68 and the second abutting surface 35 on the first projection plane lies within the first projection. At this point, due to the current flowing through the overcurrent bridge 41 of the movable contact 40 in the X-axis direction, two magnetic circuits based on the current passing through the two movable contacts 40 are formed between the first magnetic conductor 24 and the two second magnetic conductors 43, creating a magnetic attraction between the first magnetic conductor 24 and the second magnetic conductor 43. The greater the current, the greater the magnetic attraction.

[0134] As shown in Figure 21, the guide member 3 passes through the space between the two protrusions 70 along the Z-axis. The first rotating shaft 63 is inserted into the first rotating shaft hole 14 of the housing 10, allowing the armature assembly 62 to rotate relative to the accommodating member 2 about the first rotating shaft 63. The second rotating shaft 66 is inserted into the second rotating shaft hole 15 of the housing 10, allowing the rotating member 60 to rotate relative to the accommodating member 2 about the second rotating shaft 66.

[0135] The electric meter in this embodiment uses the relay 1. The relay 1 acts as an actuator and is controlled by a control module in the electric meter. The control module sends a pulse electrical signal to the relay 1.

[0136] In this embodiment, the guide member 3 slides with the movable contact unit 21 only along the straight line L, and the straight line L extends along the Y-axis. Therefore, the sliding engagement between the movable contact unit 21 and the guide member 3 is limited to the straight line L, and there is no jamming caused by the two guide members 3 not being parallel to each other. Therefore, the driving force required to be output by the drive unit 7 is smaller than that of the prior art, and the energy consumption of the coil assembly 61 is lower than that of the prior art. The guide member 3 is arranged to be located in the middle of the two movable contacts 42 along the X-axis direction. When the movable contact 40 contacts the static contact assembly 19 in a posture that is tilted relative to the X-axis direction, the reaction force of the static contact assembly 19 on the movable contact 40 will form a corrective torque centered on the position of the guide member 3. This corrective torque can automatically correct the posture of the movable contact 40, so that the two movable contacts 42 of the movable contact 40 remain arranged along the X-axis direction, thereby enabling the two movable contacts 42 to apply the same force to the corresponding static contact 22.

[0137] In this embodiment, the guide member 3 is located in the middle of the two movable contacts 42 along the X-axis direction, which reduces the size of the relay 1 along the X-axis direction, so that the structure is more compact and occupies less space.

[0138] In this embodiment, the overcurrent bridge 41 extends along the X-axis direction, and the two moving contacts 42 are fixedly connected to the overcurrent bridge 41. At this time, the safety distance between the moving contact 40 and the static contact 22 of the relay 1 is twice the actual distance between the moving contact 40 and the static contact 22. Therefore, the relay 1 has higher safety and stronger voltage resistance.

[0139] In this embodiment, the first projection and the second projection intersect, so the guide member 3 guides the movable contact member 40 according to the movement path of the movable contact member 40 , which is more conducive to improving the movement stability of the movable contact member 40 .

[0140] In this embodiment, the guide member 3 is located in the middle of the movable touch unit 21 along the Z-axis direction, which can better guide the movable touch unit 21, making it less likely for the movable touch unit 21 to deflect up and down, thereby improving the stability of the movement of the movable touch unit 21.

[0141] In this embodiment, the guide member 3 passes through the moving contact unit 21 along the Y-axis direction. Therefore, the guide member 3 not only has a guiding function along the Y-axis direction, but can also position the moving contact unit 21 in the direction perpendicular to the Y-axis direction (i.e., the X-axis direction and the Z-axis direction), so that the relative position of the moving contact 40 and the two static contacts 22 is more certain, the contact is more reliable, the contact resistance is smaller, and the heat generated by the relay 1 is smaller.

[0142] In this embodiment, both ends of the guide member 3 along the Y-axis direction are fixed to the accommodating member 2 , so that the guide member 3 can leave more sufficient space for the movable contact unit 21 and the movement of the movable contact unit 21 along the Y-axis direction.

[0143] In this embodiment, the elastic bracket 32 ​​is disposed between the pusher 28 and the movable contact assembly 30. It can provide an elastic force toward the static contact assembly 19 to the movable contact 40 after the movable contact unit 21 experiences an overtravel, thereby improving contact between the movable contact 40 and the two static contacts 22. It can also generate additional repulsive force when the movable contact 40 separates from the static contact assembly 19, helping the movable contact 40 to move away from the static contact assembly 19. The provision of the limiter 33 ensures that the distance between the movable contact 40 and the static contact assembly 19 meets design requirements.

[0144] In this embodiment, the connecting member 29 and the pushing member 28 are integrally formed by insert injection molding, so that the limiting member 33 is more easily fixed relative to the pushing member 28, and the limiting member 33 is more rigid, which has a better limiting effect on the movable contact member 40.

[0145] In this embodiment, there are two or more movable contacts 40, each capable of contacting two stationary contacts 22. Therefore, each movable contact 40 is connected in parallel when contacting two stationary contacts 22, increasing the load capacity of the relay 1 and reducing the contact resistance between the movable contact 42 and the stationary contact 23. The movable contacts 40 are arranged along the Z-axis, while extending along the X-axis and moving along the Y-axis. This allows the relay 1 to fully utilize space in all directions, resulting in a more compact structure and a smaller footprint.

[0146] In this embodiment, the first magnetic conductive group 20 is relatively fixed to the static contact group 19, and the second magnetic conductive group 31 is relatively fixed to the moving contact group 30. The first magnetic conductive group 20 and the second magnetic conductive group 31 form a magnetic circuit based on the current passing through the moving contact 40, which can form a magnetic attraction between the first magnetic conductive group 20 and the second magnetic conductive group 31. Therefore, when the relay 1 is impacted by a large fault current, the moving contact group 30 and the static contact group 19 are less likely to disengage, thereby avoiding the generation of destructive arcs that damage the relay 1.

[0147] In this embodiment, the number of the second magnetic conductors 43 is the same as the number of the movable contacts 40 in the movable contact assembly 30 , so a magnetic circuit can be formed around each movable contact 40 , making it difficult for each movable contact 40 to be separated from the stationary contact assembly 19 .

[0148] In this embodiment, the guide member 3 is positioned along the Z-axis between the current bridges 41 of the two movable contacts 40. This ensures that the guide member 3 provides uniform guidance to each movable contact 40 along the Z-axis, making each movable contact 40 less susceptible to vertical deflection. The guide member 3 passes through the gap between the first portion 46 and the second portion 47. This not only allows the second magnetic conductor 43 to give way to the guide member 3, but also allows for the formation of magnetic circuits on both the left and right sides of the guide member 3 along the X-axis, ensuring magnetic efficiency. This also ensures that the movable contact 40 is subjected to uniform force on both sides of the guide member 3 along the X-axis, making the movable contact 40 less susceptible to horizontal deflection.

[0149] In this embodiment, the first magnetic conductor group 20 is provided with the first magnetic conductor 24, which is more convenient to install. The guide member 3 passes through the first magnetic conductor 24, which can ensure the relative position of the first magnetic conductor 24 and the guide member 3 with the receiving member 2.

[0150] In this embodiment, by providing a barrier portion 16 on the accommodating member 2 to separate the first magnetic conductor 24 from the static contacts 22 on both sides, the two static contacts 22 are less likely to be short-circuited through the first magnetic conductor group 20 in the middle.

[0151] In this embodiment, the fitting clearance between the guide member 3 and the limit member 33 is minimal, which can make the guiding effect of the guide member 3 most obvious at the limit member 33 along the Y-axis direction. Since the dynamic contact member 40 moves synchronously with the limit member 33 before the overtravel, the guiding effect of the guide member 3 at the limit member 33 can also be directly fed back to the dynamic contact member, and play a better guiding role for the dynamic contact member 40. At the same time, the fitting clearance between other parts of the movable contact unit 21 and the guide member 3 is larger than the fitting clearance between the limit member 33 and the guide member 3, which can allow the movable contact unit 21 to have a certain degree of freedom in other positions in the Y-axis direction except for the limit member 33. Even if there is a slight deflection, it can be corrected by the guiding effect of the guide member 3 on the limit member 33 to ensure that the movable contact member 40 has the correct posture when contacting the two static contacts 22, and also makes it easier for the movable contact member 40 to automatically correct its posture based on the reaction force of the static contact group 19 on the movable contact member 40 when it collides with the static contact member group 19 in a posture deflected relative to the X-axis direction. What is particularly important is that when the pusher 28 is driven by the swinging magnetic circuit unit to move linearly along the Y-axis direction, and the radial component of the rotation of the armature assembly 62 acts on the pusher 28 through friction, by allowing the movable contact unit 21 to have a certain degree of freedom in the position other than the limit member 33 in the Y-axis direction, the movable contact unit 21 is allowed to be slightly deflected, which can further avoid the above-mentioned friction force causing the movable contact unit 21 to get stuck in the Y-axis direction.

[0152] In this embodiment, the elastic member 5 stores energy due to deformation when the moving contact group 30 moves in the direction away from the static contact group 19 and releases energy due to recovery of deformation when the moving contact group 30 moves in the direction close to the static contact group 19. This can better help the moving contact unit 21 start from a position away from the static contact group 19 and approach the static contact group 19, which is beneficial to increase the movement stroke of the moving contact 40, and therefore also beneficial to increase the safety distance between the moving contact 40 and the static contact group 19.

[0153] In this embodiment, the elastic member 5 is sleeved on the guide member 3 , with one end thereof abutting against the protrusion 18 and the other end elastically abutting against the pushing member 28 , resulting in a more compact structure and smaller occupied space.

[0154] In this embodiment, when the moving contact 40 contacts the two static contacts 22 along the Y-axis direction, the elastic member 5 applies an elastic force toward the static contact group 19 to the moving contact unit 21, which can improve the stability of the moving contact 40 and the two static contacts 22 in the closed state, and further improve the short-circuit resistance, that is, improve the ability of the dynamic contact 40 to prevent the static contact 22 from being disengaged when the relay 1 is subjected to a large fault current.

[0155] In this embodiment, by providing separators 58 on both sides of the static contact assembly 19 along the X-axis direction, and using high-temperature resistant insulating material for the separators 58 , it is possible to prevent the arc overflowing laterally from damaging other parts of the relay 1 .

[0156] This embodiment adopts a swinging magnetic circuit unit, which is small in size and helps to reduce the size of the relay. Furthermore, the use of a swinging magnetic circuit unit can effectively amplify the tangential movement stroke of the armature assembly 62, which is beneficial to increase the safety distance between the moving contact 40 and the static contact 22, and utilizes the closed magnetic circuit that can be formed between the coil assembly 61 and the armature assembly 62 to reduce magnetic loss and reduce magnetic resistance, thereby avoiding the need to use a large-volume magnetic circuit unit 59, further helping to reduce the size of the relay 1.

[0157] In this embodiment, the magnetic circuit unit 59 and the moving contact unit 21 are spaced apart along the X-axis direction, which can prevent the relay 1 from being too large in the movement direction (Y-axis direction) of the moving contact unit 21, so that the structure is more compact and occupies less space; at the same time, it can prevent the magnetic circuit unit 59 from affecting the linear movement of the moving contact unit 21 along the Y-axis direction, thereby ensuring a larger safety distance between the moving contact 42 and the static contact 23.

[0158] In this embodiment, the tangential component of the movement of the armature assembly 62 is transmitted to the pushing member 28 through the rotating member 60. On the one hand, it is convenient to adjust the spacing between the magnetic circuit unit 59 and the moving contact unit 21 along the X-axis direction. On the other hand, compared with the technical solution of directly extending the swing arm from the armature assembly 62, the ratio of the resistance arm to the power arm is smaller, and the required magnetic driving force is smaller, which helps to reduce the volume of the magnetic circuit unit 59 and the relay 1.

[0159] In this embodiment, the second end portion 68 extends into the pushing cavity 34, which can make the pusher 28 and the rotating member 60 fit more tightly. By providing two protrusions 70 spaced apart along the Z-axis, the guide member 3 can be made to give way.

[0160] In this embodiment, when the dynamic contact 40 contacts the two static contacts 22, the projection of the contact point between the second end 68 and the second abutment surface 35 on the first projection plane is located within the first projection, which means that when the dynamic contact 40 contacts the two static contacts 22, the force point of the dynamic contact unit 21 is within the width range of the guide member 3, so the dynamic contact unit 21 will not generate a deflection torque, which can ensure that the dynamic contact 40 correctly abuts the two static contacts 22 along the Y-axis direction.

[0161] In this embodiment, when the moving contact 40 contacts and moves away from the corresponding static contact 22 along the Y-axis direction, the positions where the second end 68 and the two second abutting surfaces 35 respectively abut are located on the same straight line extending along the Y-axis direction. In this way, the movement path of the second end 68 is a circular arc path that is symmetrical about the surface perpendicular to the Y-axis direction and passing through the second rotating axis 66. The movement component formed by the second end 68 in the radial direction is small. Therefore, the deflection that may be generated by the pushing member 28 and the entire moving contact unit 21 is small, thereby avoiding the situation where the moving contact unit 21 is stuck with the guide member 3 due to the need to deflect relative to the Y-axis direction, and reducing the friction between the moving contact unit 21 and the second end 68, and is conducive to reducing the volume of the magnetic circuit unit 59 and the relay 1.

[0162] In this embodiment, the provision of a microswitch 8 allows the status of the relay 1 to be transmitted to an external relay status sensing circuit. Furthermore, the dynamic spring 71 of the microswitch 8 provides a thrust for the movement of the moving contact unit 21 toward the static contact assembly 19, accelerating the closing of the moving contact 40 and the two static contacts 22.

[0163] The above specification and description of the embodiments are used to explain the protection scope of the present disclosure, but do not constitute a limitation on the protection scope of the present disclosure.

Claims

1. A relay, characterized in that: include: accommodating member (2); An electric control part (4), the electric control part (4) comprising a static contact group (19) and a dynamic contact unit (21), the static contact group (19) being fixedly connected to the accommodating part (2) and comprising two static contacts (22) arranged along the X-axis direction, the dynamic contact unit (21) moving relative to the accommodating part (2) along the Y-axis direction and comprising a dynamic contact group (30) corresponding to the static contact group (19), the dynamic contact group (30) comprising a dynamic contact (40), the dynamic contact (40) being provided with two dynamic contact points (42) arranged along the X-axis direction, the two dynamic contact points (42) being capable of contacting or moving away from the corresponding static contact (22) along the Y-axis direction, wherein the Y-axis direction is perpendicular to the X-axis direction; A guide member (3) is fixed to the accommodating member (2) and is located in the middle of the two moving contacts (42) along the X-axis direction; the guide member (3) only slides with the moving contact unit (21) along a straight line (L), and the straight line (L) extends along the Y-axis direction.

2. A relay as claimed in claim 1, characterized in that: The movable contact (40) is further provided with a current-passing bridge (41), the current-passing bridge (41) extending along the X-axis direction, and two movable contact points (42) are fixedly connected to the current-passing bridge (41).

3. A relay as claimed in claim 2, characterized in that: A first projection of the guide member (3) on the first projection plane intersects with a second projection of the movable contact member (40) on the first projection plane, and the first projection plane is perpendicular to the Z-axis direction, and the Z-axis direction is perpendicular to the Y-axis direction and the X-axis direction.

4. A relay as claimed in claim 2, characterized in that: The guide member (3) is located in the middle of the movable contact unit (21) along the Z-axis direction.

5. A relay as claimed in claim 3, characterized in that: The guide member (3) extends along the Y-axis direction and passes through the movable contact unit (21).

6. A relay as claimed in claim 5, characterized in that: The guide member (3) is in the shape of a rod with both ends fixed to the accommodating member (2) and extending along a straight line (L).

7. A relay as claimed in claim 5, characterized in that: The movable contact unit (21) further comprises a pushing member (28), an elastic bracket (32) and a limiting member (33); the elastic bracket (32) and the limiting member (33) both correspond to the movable contact member group (30); the elastic bracket (32) is located between the pushing member (28) and the movable contact member group (30) along the Y-axis direction; the limiting member (33) is fixed relative to the pushing member (28) and abuts against the movable contact member (40) along the Y-axis direction when the movable contact member (40) is away from the two static contact members (22) to limit the distance between the movable contact member (40) and the static contact member group (19).

8. A relay as claimed in claim 7, characterized in that: The dynamic contact unit (21) further includes a connecting member (29), the connecting member (29) corresponds to the limiting member (33) and is integrally formed by insert injection molding with the pushing member (28), the two ends of the connecting member (29) along the Z-axis direction respectively extend out of the pushing member (28), and the limiting member (33) is fixedly connected to the two ends of the connecting member (29).

9. A relay as claimed in claim 7, characterized in that: The number of the movable contacts (40) in the movable contact group (30) is more than two, and the more than two movable contacts (40) are arranged along the Z-axis direction.

10. A relay as claimed in claim 9, characterized in that: The electric control part (4) also includes a first magnetic conductive group (20), and the dynamic contact unit (21) also includes a second magnetic conductive group (31); the first magnetic conductive group (20) corresponds to the static contact group (19) and is fixed relative to the static contact group (19), and the second magnetic conductive group (31) corresponds to the dynamic contact group (30) and is fixed relative to the dynamic contact group (30); when the dynamic contact (40) contacts the two static contacts (22), the second magnetic conductive group (31) approaches or abuts the first magnetic conductive group (20) along the Y-axis direction, so that the first magnetic conductive group (20) and the second magnetic conductive group (31) form a magnetic circuit based on the current passing through the dynamic contact (40).

11. A relay as claimed in claim 10, characterized in that: The second magnetic conductor group (31) includes second magnetic conductors (43), and the number of the second magnetic conductors (43) is the same as that of the movable contacts (40) in the corresponding movable contact group (30) and they correspond to each other one by one; the second magnetic conductor (43) is provided with a main body (44) and an extension portion (45), the main body (44) is fixed to the back of the overcurrent bridge (41) and extends along the Z-axis direction, and the extension portion (45) extends from both ends of the main body (44) along the Z-axis direction along the Y-axis direction toward the first magnetic conductor group (20).

12. A relay as claimed in claim 11, characterized in that: There are two moving contacts (40) in the moving contact group (30), and the guide member (3) is located between the overcurrent bridges (41) of the two moving contacts (40) along the Z-axis direction. In the second magnetic conductor (43), an extension portion (45) close to the guide member (3) along the Z-axis direction is provided with a first portion (46) and a second portion (47) along the X-axis direction. The first portion (46) and the second portion (47) are spaced apart along the X-axis direction, and the guide member (3) passes through the space between the first portion (46) and the second portion (47).

13. A relay as claimed in claim 12, characterized in that: The first magnetic conductor group (20) includes a first magnetic conductor (24), the first magnetic conductor (24) is fixed to the accommodating member (2), the first magnetic conductor (24) extends along the Z-axis direction and is located between the two static contact members (22) along the X-axis direction; and the guide member (3) passes through the first magnetic conductor (24).

14. A relay as claimed in claim 13, characterized in that: The accommodating member (2) is provided with two blocking portions (16), and the two blocking portions (16) are respectively located on both sides of the first magnetic conductor (24) along the X-axis direction and between the two static contact members (22).

15. A relay according to any one of claims 7 to 14, characterized in that: In the dynamic contact unit (21), the matching clearance between the limiting member (33) and the guide member (3) is the smallest.

16. A relay as claimed in claim 7, characterized in that: The invention also includes an elastic member (5), one end of which along the Y-axis direction can elastically abut against the pushing member (28), and store energy when the moving contact member (40) moves in a direction away from the static contact member group (19), and release energy when the moving contact member (40) moves in a direction close to the static contact member group (19).

17. A relay as claimed in claim 16, characterized in that: The guide member (3) is provided with a protrusion (18) at a position away from the static contact member group (19); the elastic member (5) is sleeved on the guide member (3), with one end thereof abutting against the protrusion (18) and the other end elastically abutting against the pushing member (28).

18. A relay as claimed in claim 16, characterized in that: When the movable contact (40) contacts two stationary contact members (22) along the Y-axis direction, the elastic member (5) applies an elastic force toward the stationary contact member group (19) to the movable contact unit (21).

19. A relay as claimed in claim 1, characterized in that: The invention also includes a separator group (6), which corresponds to the static contact group (19) and is provided with two separators (58). The two separators (58) are fixed to the accommodating member (2) and are located on both sides of the static contact group (19) along the X-axis direction. The separators (58) are made of high-temperature resistant insulating material.

20. A relay as claimed in claim 7, characterized in that: The invention also includes a driving part (7), which is used to drive the movable contact unit (21) to move along the Y-axis direction and includes a magnetic circuit unit (59), wherein the magnetic circuit unit (59) includes a coil assembly (61) and an armature assembly (62), wherein the coil assembly (61) is fixed to the accommodating part (2) and drives the armature assembly (62) to rotate around a first rotating shaft (63) extending along the Z-axis direction; the output end of the driving part (7) abuts against the pushing member (28) along the Y-axis direction to convert the rotation of the armature assembly (62) into a linear motion of the pushing member (28) along the Y-axis direction.

21. A relay as claimed in claim 20, characterized in that: The magnetic circuit unit (59) and the movable contact unit (21) are arranged at intervals along the X-axis direction.

22. A relay as claimed in claim 20, characterized in that: The driving part (7) further includes a rotating member (60), which rotates around a second rotating shaft (66) extending along the Z-axis direction and is provided with a first end (67) and a second end (68) on both sides of the second rotating shaft (66), wherein the second end (68) is the output end of the driving part (7); the armature assembly (62) is provided with two first abutting surfaces (65) opposite to or opposite to each other, and the first end (67) can abut against the two first abutting surfaces (65); the pushing member (28) is provided with two second abutting surfaces (35) opposite to or opposite to each other along the Y-axis direction, and the second end (68) can abut against the two second abutting surfaces (35).

23. A relay as claimed in claim 22, characterized in that: The pushing member (28) is provided with a pushing cavity (34), two second abutting surfaces (35) are arranged on two opposite walls of the pushing cavity (34) along the Y-axis direction, the second end portion (68) extends into the pushing cavity (34) and is provided with two protrusions (70) along the Z-axis direction, the two protrusions (70) are arranged at intervals along the Z-axis direction, and the guide member (3) passes through the interval between the two protrusions (70).

24. A relay as claimed in claim 22, characterized in that: When the movable contact (40) contacts the two stationary contact members (22), the projection of the contact point between the second end portion (68) and the second abutting surface (35) on the first projection surface is located within the first projection.

25. A relay as claimed in claim 22, characterized in that: When the movable contact (40) contacts and moves away from the corresponding static contact (22) along the Y-axis direction, the positions where the second end (68) and the two second abutting surfaces (35) respectively abut are located on the same straight line extending along the Y-axis direction.

26. A relay as claimed in claim 22, characterized in that: The invention also includes a micro switch (8), wherein the micro switch (8) is provided with a dynamic spring (71), and the pushing member (28), the rotating member (60) or the armature assembly (62) can push against the dynamic spring (71) to turn the micro switch (8) on or off.

27. An electric meter, characterized in that: It comprises a relay (1) as claimed in any one of claims 1 to 26.

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