Built-in switch and electric energy meter

Abstract

The invention discloses a built-in switch and an electric energy meter using the same, the built-in switch comprises a shell, an electromagnetic operating system and at least one contact unit, the contact unit at least comprises a contact system, and the contact system comprises a moving contact assembly and a static contact group. The electromagnetic operating system, the moving contact assembly and the static contact set are sequentially arranged in the containing cavity of the shell in the first direction, the electromagnetic operating system at least drives the moving contact assembly of one contact unit to move in the first direction to make contact with or be separated from the static contact set, and the static contact set comprises two static contacts arranged at intervals in the second direction. Each static contact is provided with a wiring part, and the wiring part extends out of the accommodating cavity from one end, far away from the electromagnetic operating system, of the shell in the first direction. The built-in switch is arranged in the electric energy meter, the contact system of the built-in switch is of a double-breakpoint structure, the current bearing capacity of the built-in switch is improved, the electromagnetic operating system, the moving contact assembly and the static contact assembly are sequentially arranged in the same direction, and space saving in the length or thickness direction is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and particularly to an in-built switch and an electricity meter. Background Art

[0002] The pre-paid electricity meters of the prior art mainly control the electricity consumption of the main line by an in-built relay or an external circuit breaker. In the existing products, the current-carrying capacity of the in-built relay is low, which easily causes faults such as burning or welding; while the external circuit breaker is large in size, short in service life, and inconvenient for power companies to manage assets. Summary of the Invention

[0003] The purpose of the present invention is to overcome at least one defect of the prior art and provide an in-built switch and an electricity meter.

[0004] The present invention provides an in-built switch, which includes a housing, an electromagnetic operating system, and at least one contact unit. The contact unit at least includes a contact head system, and the contact head system includes a moving contact head assembly and a static contact head group. The electromagnetic operating system, the moving contact head assembly, and the static contact head group are sequentially arranged in the accommodating cavity of the housing along a first direction. The electromagnetic operating system drives the moving contact head assembly of at least one contact unit to move in the first direction to contact or separate from the static contact head group. The static contact head group includes two static contact heads spaced apart in a second direction. Each static contact head is provided with a wiring part, and the wiring part extends from one end of the housing far away from the electromagnetic operating system to the outside of the accommodating cavity in the first direction. And the two wiring parts of the same contact unit are arranged side by side on the same outer side of the housing far away from the electromagnetic operating system. The first direction and the second direction are perpendicular to each other.

[0005] Preferably, it includes two or more contact units, and two adjacent contact units are arranged side by side in the second direction.

[0006] Preferably, the electromagnetic operating system includes a coil assembly and a moving assembly. The coil assembly drives the moving assembly to move in the first direction, and the moving assembly is drivingly connected to the moving contact head assembly of at least one contact unit.

[0007] Preferably, each contact unit further includes an arc extinguishing system. The arc extinguishing system includes two arc extinguishing chambers spaced apart in the second direction, and the moving contact head assembly moves in the first direction between the two arc extinguishing chambers.

[0008] Preferably, each contact unit further includes a sampling device. The sampling device is arranged outside the accommodating cavity and connected to one of the wiring parts; or, the sampling device is arranged inside the accommodating cavity and electrically connected to one of the static contact heads.

[0009] Preferably, the two wiring parts of the same static contact head group are divided into an incoming line part and an outgoing line part, and all the sampling devices are connected to the incoming line part or all are connected to the outgoing line part.

[0010] Preferably, it includes at least two contact units arranged side by side in the second direction, and adjacent moving contact assemblies are linked and connected.

[0011] Preferably, the accommodation cavity is divided into a first accommodation cavity and at least one second accommodation cavity. An electromagnetic operating system is assembled in the first accommodation cavity, and one contact unit is arranged in each second accommodation cavity. Adjacent second accommodation cavities are arranged side by side in the second direction.

[0012] Preferably, all the second accommodation cavities form a symmetrical structure with respect to the central axis of the first accommodation cavity.

[0013] Preferably, a control system is further provided in the housing. The control system includes a control circuit board, and the control circuit board is connected to the electromagnetic operating system and they are jointly arranged in the first accommodation cavity.

[0014] Preferably, the moving contact assembly is provided with an isolation part, and the isolation part extends along the first direction and corresponds to between two static contacts.

[0015] Preferably, the moving contact assembly includes a contact support and a moving contact bridge. The contact support is arranged in the accommodation cavity along the first direction. One end of the contact support close to the electromagnetic operating system is used as the driving end, and an assembly groove is provided at the other end of the contact support. The moving contact bridge is arranged through the assembly groove along the second direction, and both ends of the moving contact bridge are respectively used as moving contact parts corresponding to two static contacts.

[0016] Preferably, the static contact includes a static contact plate. The static contact plate includes a static contact part, a connecting plate and a wiring part. The static contact part is arranged in the accommodation cavity along the second direction. The static contact part is spaced opposite to the moving contact assembly in the first direction. The first end of the connecting plate is arranged along the first direction and is connected to one end of the static contact part. The second end of the connecting plate is spaced opposite to the static contact part in the second direction and is attached to the inner side wall of the accommodation cavity. The wiring part is connected to the second end of the connecting plate and extends outside the accommodation cavity.

[0017] Preferably, a yoke is arranged around the outside of the coil assembly. The coil skeleton includes a coil skeleton and a magnet. Two coils are wound around the middle of the coil skeleton, and the two coils are distributed along the axial direction of the coil skeleton. The magnet is arranged on the coil skeleton, and the magnet, the coil and the yoke cooperate together to drive the moving assembly to move along the axial direction of the coil skeleton.

[0018] Preferably, the magnets are arranged in pairs at opposite ends of the coil skeleton, or the magnets are arranged in pairs between two coils and form a symmetrical structure with respect to the central axis of the coil skeleton.

[0019] Preferably, the moving component includes a moving iron core and a driving rod. The moving iron core is slidably assembled in the middle of the coil bobbin between two magnets. The driving rod is connected to the moving iron core, and at least one end of the driving rod extends out of the coil bobbin for driving connection with the moving contact component.

[0020] The present invention also provides an electric energy meter, which includes at least one-phase main circuit. At least one built-in switch as described above is arranged in the inner cavity of the electric energy meter, and each contact unit is connected to one-phase main circuit.

[0021] For the built-in switch of the present invention and the electric energy meter applying the built-in switch, the built-in switch is arranged in the electric energy meter, and its contact system is a double-break structure, which is beneficial to improving its current-carrying capacity. At the same time, the electromagnetic operating system, the moving contact component and the static contact group are arranged in sequence along the same direction, which is beneficial to saving space in the length or thickness direction.

[0022] In addition, two adjacent contact units are arranged side by side in the second direction, which is beneficial to reducing the overall thickness of the built-in switch.

[0023] In addition, the moving contact moves between two arc extinguishing chambers, which improves its arc extinguishing effect.

[0024] In addition, the sampling device can be located outside the housing, which can not only save the space inside the housing, but also avoid being interfered by internal parts. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the built-in switch of the present invention (multiple contact units);

[0026] Figure 2 is a schematic structural diagram of the built-in switch of the present invention (single contact unit);

[0027] Figure 3 is a schematic structural diagram of the electromagnetic operating system in the present invention (the first embodiment);

[0028] Figure 4 is a cross-sectional view of the electromagnetic operating system in the present invention (the first embodiment);

[0029] Figure 5 is a schematic diagram of the cooperation of the coil, the moving iron core and the magnet in the electromagnetic operating system in the present invention (the first position in the first embodiment);

[0030] Figure 6 is a schematic diagram of the cooperation of the coil, the moving iron core and the magnet in the electromagnetic operating system in the present invention (the second position in the first embodiment);

[0031] Figure 7 is a schematic structural diagram of the electromagnetic operating system in the present invention (the second embodiment);

[0032] Figure 8 is a cross-sectional view of the electromagnetic operating system in the present invention (second embodiment);

[0033] Figure 9 is a cross-sectional view of the electromagnetic operating system in the present invention (at the magnet of the second embodiment);

[0034] Figure 10 is a schematic diagram of the cooperation of the coil, the moving iron core and the magnet in the present invention (the first position in the second embodiment);

[0035] Figure 11 is a schematic diagram of the cooperation of the coil, the moving iron core and the magnet in the present invention (the second position in the second embodiment);

[0036] Figure 12 is a schematic diagram of the structure of the built-in switch disposed in the electricity meter in the present invention;

[0037] Reference numerals:

[0038] A - built-in switch, 1 - housing, 11 - first accommodating cavity, 12 - second accommodating cavity, 2 - contact unit, 20 - linkage rod, 21 - contact support, 211 - isolation part, 22 - moving contact bridge, 23 - static contact, 231 - wiring part, 24 - arc extinguishing chamber, 3 - electromagnetic operating system, 31 - coil skeleton, 310 - partition part, 311 - retaining wall, 312 - winding shaft, 313 - magnet cavity, 314 - limiting boss, 32 - magnet, 321 - first magnet, 322 - second magnet, 33 - moving iron core, 34 - coil, 341 - first coil, 342 - second coil, 35 - magnetic yoke, 351 - first straight plate, 352 - second straight plate, 36 - buffer plate, 37 - driving rod, 4 - sampling device, B - electricity meter, 51 - electricity meter inner cavity, 52 - wiring terminal. Detailed implementation manners

[0039] The following embodiments given in conjunction with the drawings further illustrate the detailed implementation manners of the built-in switch and the electricity meter of the present invention. The built-in switch and the electricity meter of the present invention are not limited to the descriptions of the following embodiments.

[0040] Such as Figure 1 、 2As shown in FIGS. 11 and 12, the built-in switch A is usually used to be installed in the electricity meter B. The built-in switch A includes a housing 1 and a control system (not shown). An electromagnetic operating system 3 and at least one contact unit 2 are arranged in the accommodation cavity inside the housing 1. The electromagnetic operating system 3 is connected to the control system. Among them, the control system can be arranged in the accommodation cavity inside the housing 1 at the same time, or can be arranged in the inner cavity 51 of the electricity meter outside the housing 1, or share the control system with the electricity meter B. The electromagnetic operating system 3 acts according to the control signal output by the control system. The electromagnetic operating system 3 includes a coil assembly and a moving assembly. The coil assembly is connected to the control system, and the moving assembly is driven by the coil assembly to move between a first position and a second position.

[0041] Each contact unit 2 at least includes a contact head system, where the contact head system includes a moving contact head assembly and a static contact head group that cooperate with each other. The moving contact head assembly of at least one contact unit 2 is drivingly connected to the electromagnetic operating system 3, and the moving contact head assembly is driven by the electromagnetic operating system 3 to contact or separate from the static contact head group. When two or more contact units 2 are arranged in the housing 1, the adjacent two contact units 2 are arranged side by side, and the adjacent two moving contact head assemblies are linked, so as to realize the synchronous action of all contact head systems.

[0042] Furthermore, each contact unit 2 further includes a sampling device 4. The sampling device 4 is electrically connected to the contact head system. The sampling device 4 feeds back the acquired current signal to the control system, and the control system judges whether there is a fault in the contact unit 2, such as a short-circuit fault, so as to output a control signal to drive the electromagnetic operating system 3.

[0043] Furthermore, each contact unit 2 further includes an arc extinguishing system. The arc extinguishing system is arranged in the accommodation cavity on one side of the contact head system for extinguishing the arc generated when the contact head system is disconnected, thereby improving the use safety.

[0044] For the convenience of description, the direction of the connection line between the first position and the second position is taken as the first direction, that is Figure 1 、 2 the direction where the Y-axis is located in FIGS. 11 and 12. The first direction can also be understood as the height direction of the built-in switch A. The second direction is perpendicular to the first direction, that is Figure 1 、 2 the direction where the X-axis is located in FIGS. 11 and 12. The second direction can be understood as the length direction of the built-in switch A. The third direction is perpendicular to the first direction and the second direction at the same time. In Figure 1 、 2 FIGS. 11 and 12, the third direction is the direction perpendicular to the paper surface. The third direction can be understood as the thickness direction of the built-in switch A.

[0045] As Figure 1 、 2As shown in the figure, the improvement of the present application lies in that the electromagnetic operating system 3, the moving contact assembly and the static contact group are sequentially arranged in the accommodating cavity of the housing 1 along the first direction. The electromagnetic operating system 3 drives at least one moving contact assembly of the contact unit 2 to move in the first direction to contact or separate from the static contact group. The static contact group includes two static contacts 23 arranged at intervals in the second direction. Each static contact 23 is provided with a wiring portion 231. The wiring portion 231 extends from one end of the housing 1 far away from the electromagnetic operating system 3 to the outside of the accommodating cavity in the first direction, and the two wiring portions 231 of the same contact unit 2 are arranged side by side on the same outer side of the housing 1 far away from the electromagnetic operating system 3.

[0046] In this way, its contact system is a double-break structure, which is beneficial to improving its current-carrying capacity. At the same time, the electromagnetic operating system 3, the moving contact assembly and the static contact group are sequentially arranged in the same direction, which is beneficial to saving space in the length or thickness direction.

[0047] When two or more contact units 2 are arranged in the accommodating cavity, two adjacent contact units 2 are arranged side by side in the second direction. Compared with the structure in which two adjacent contact units 2 in the existing built-in switch A are arranged side by side in the third direction, the structure arranged side by side in the second direction can reduce the overall thickness.

[0048] Such as Figure 1 、 2 As shown in the figure, each contact unit 2 is further provided with a sampling device 4. The sampling device 4 is arranged outside the accommodating cavity and is connected to the wiring portion 231 of one of the static contacts 23. Preferably, the wiring portions 231 of the two static contacts 23 are respectively an incoming line portion and an outgoing line portion. When two or more contact units 2 are arranged in the housing 1, all the sampling devices 4 are connected to the incoming line portion or the outgoing line portion. The sampling device 4 can be a current transformer or a manganin shunt, etc. Of course, when the internal space of the accommodating cavity is large enough, the sampling device 4 can also be arranged inside the accommodating cavity and electrically connected to one of the static contacts 23.

[0049] Such as Figure 1 、 2 As shown in the figure, each contact unit 2 further includes an arc extinguishing system. The arc extinguishing system includes two arc extinguishing chambers 24 arranged at intervals in the second direction. The arc extinguishing grooves of each arc extinguishing chamber 24 face the contact system, and an interval for the moving contact assembly to move is formed between the arc extinguishing grooves of the two arc extinguishing chambers 24, which is beneficial to extinguishing the arc generated when the contact system is disconnected.

[0050] Preferably, the accommodation cavity is divided in a first direction into a first accommodation cavity 11 and at least one second accommodation cavity 12. The electromagnetic operating system 3 is arranged in the first accommodation cavity 11, and a contact unit 2 is arranged in each second accommodation cavity 12. Two or more second accommodation cavities 12 are arranged in a second direction. By arranging the electromagnetic operating system 3 and the contact unit 2 in different accommodation cavities respectively, interference between the two can be prevented. When the number of second accommodation cavities 12 is two or more, two adjacent second accommodation cavities 12 are arranged side by side in the second direction. The static contacts 23 of adjacent contact units 2 are arranged in sequence along the second direction, and the moving contact bridges 22 of the moving contact assemblies of adjacent contact units 2 are also arranged in sequence along the second direction.

[0051] Furthermore, all the second accommodation cavities 12 form a symmetric structure with respect to the central axis of the first accommodation cavity 11. That is, when the number of second accommodation cavities 12 is one, the central axes of the first accommodation cavity 11 and the second accommodation cavity 12 are collinear; when the number of second accommodation cavities 12 is two or more, one second accommodation cavity 12 located in the middle position is collinear with the central axis of the first accommodation cavity 11, or two second accommodation cavities 12 located in the middle position are symmetrically distributed on both sides of the central axis of the first accommodation cavity 11 in the second direction.

[0052] Combined Figure 1 and 3 -12 provides a first embodiment of an in-built switch A.

[0053] As Figure 1 shown, the in-built switch A includes a housing 1. The accommodation cavity inside the housing 1 is divided in a first direction into a first accommodation cavity 11 and three second accommodation cavities 12. The three second accommodation cavities 12 are arranged side by side in the second direction, and the central axis of the first accommodation cavity 11 is collinear with the central axis of the second accommodation cavity 12 located in the middle position, making the overall housing 1 a symmetric convex-shaped structure. In this embodiment, the lengths of the first accommodation cavity 11 and the second accommodation cavity 12 in the second direction are equal; an electromagnetic operating system 3 and three contact units 2 are arranged in the accommodation cavity along the first direction. The three contact units 2 are arranged side by side in the second direction. The electromagnetic operating system 3 is arranged in the first accommodation cavity 11, and the structures of each contact unit 2 are the same and are respectively arranged in one second accommodation cavity 12.

[0054] Specifically as Figure 1As shown, each contact unit 2 includes a contact system, an arc extinguishing system, and a sampling device 4. The contact system includes a moving contact assembly and a static contact group arranged at intervals. In the first direction, the electromagnetic operating system 3, the moving contact assembly, and the static contact group are arranged in sequence along the first direction. In the figure, the electromagnetic operating system 3 is drivingly connected to the moving contact assembly located in the middle position, and two adjacent moving contact assemblies are connected in a linkage manner. The static contact group includes two static contacts 23 arranged at intervals in the second direction. The static contact 23 is provided with a wiring portion 231, and the wiring portion 231 extends from one end of the second accommodation cavity 12 away from the first accommodation cavity 11 to the outside of the housing 1. Figure 1 , 2 In, the two wiring portions 231 of the same contact unit 2 are arranged side by side on the same side outside the housing 1, and the two wiring portions 231 are located on the side away from the electromagnetic operating system 3. As Figure 12 shown, when the built-in switch A is arranged in the inner cavity 51 of the electric energy meter, each contact unit 2 is correspondingly connected to a main line of one phase of the electric energy meter B. That is, the two wiring portions 231 in the same contact unit 2 are respectively connected to two wiring terminals 52 of a main line of one phase in the electric energy meter B.

[0055] As Figure 1 shown, the moving contact assembly includes a contact support 21 and a moving contact bridge 22. Each contact support 21 is integrally in the shape of a rectangular block. One end of the contact support 21 close to the electromagnetic operating system 3 is used as the driving end. A linkage rod 20 is connected between the driving ends of two adjacent contact supports 21. The driving end located in the middle position is drivingly connected to the electromagnetic operating system 3. An assembly groove is provided at one end of the contact support 21 away from the electromagnetic operating system 3. The assembly groove penetrates the contact support 21 in the second direction. The moving contact bridge 22 is arranged in the assembly groove in a penetrating manner along the second direction. Both ends of the moving contact bridge 22 extend outside the contact support 21 respectively. Both ends of the moving contact bridge 22 are respectively used as moving contact parts. Each moving contact part is spaced opposite to a static contact 23 in the first direction. Preferably, an isolation part 211 is provided at the end of the contact support 21 away from the electromagnetic operating system 3. In the figure, the isolation part 211 is in the shape of a plate. The isolation part 211 extends along the first direction and can correspond to the space between the two static contacts 23. Preferably, when the moving contact assembly is separated from the static contact 23, the isolation part 211 is still located between the two static contacts 23, so as to isolate the two static contacts 23.

[0056] As Figure 1As shown, two static contacts 23 are symmetrically arranged in the second accommodating chamber 12, each static contact 23 includes a static contact plate, and the static contact plate includes an integrally formed static contact portion, a connecting plate and a wiring portion 231, wherein the static contact portion is arranged in the second accommodating chamber 12 along the second direction at a position away from the first accommodating chamber 11, each static contact portion is spaced and opposite to a dynamic contact portion in the first direction, and the first end of the connecting plate is arranged along the first direction and connected to one end of the static contact portion. In the figure, the first end of the connecting plate is connected to one end of the static contact portion close to the isolation portion 211, and the second end of the connecting plate is in the second direction. The connecting plate of this embodiment is arranged to be opposite to the static contact portion and fit to the inner wall of the second accommodating chamber 12, and the connecting plate is L-shaped as a whole, which can play a certain supporting role; the wiring portion 231 has a certain length in the first direction, which is convenient for connecting with the sampling device 4 and the wiring terminal 52 of the electric energy meter B, one end of the wiring portion 231 is connected to the second end of the connecting plate, and the other end of the wiring portion 231 extends from the end of the second accommodating chamber 12 away from the first accommodating chamber 11 to the outside of the housing 1, and the two wiring portions 231 of the same contact unit 2 are respectively an incoming line portion and an outgoing line portion.

[0057] Furthermore, each moving contact part and each static contact part are also provided with an arc-starting part. Figure 1 In the figure, the arc striking part extends toward the arc extinguishing system and is connected with the arc extinguishing system, so as to facilitate the introduction of the arc into the arc extinguishing system. In the figure, the moving arc striking part and the static arc striking part are respectively extended from the end of the moving contact part and the end of the static contact part.

[0058] In this embodiment, the arc extinguishing system includes two arc extinguishing chambers 24, each arc extinguishing chamber 24 includes a plurality of arc extinguishing grids arranged at intervals in the first direction, an arc extinguishing notch is provided at one end of each arc extinguishing grid, and the plurality of arc extinguishing notches are connected in the first direction to form an arc extinguishing groove, each static contact portion corresponds to an end of the arc extinguishing groove away from the electromagnetic operating system 3, the static arc striking portion is connected to an end of the arc extinguishing groove away from the electromagnetic operating system 3 and is bent in a direction away from the electromagnetic operating system 3, each moving contact portion corresponds to an end of the arc extinguishing groove close to the electromagnetic system, the moving arc striking portion is connected to an end of the arc extinguishing groove close to the electromagnetic operating system 3, and each moving arc striking portion can move in the arc extinguishing groove along the first direction under the drive of the electromagnetic operating system 3. Of course, the arc extinguishing chamber 24 can also adopt the existing technology, and the arc striking portion can also be a pair of arc striking plates configured in the arc extinguishing system.

[0059] In this embodiment, the sampling device 4 is a current transformer, a connection portion 231 of a static contact 23 passes through the central hole of the current transformer along a first direction, and the current transformer is connected to a control circuit board of the control system for feeding back current signals.

[0060] In this embodiment, the control system includes a control circuit board. The electromagnetic operating system 3 and the control circuit board can be jointly arranged in the first accommodating cavity 11, which facilitates the connection between the electromagnetic operating system 3 and the control circuit board. The controller on the control circuit board outputs a control signal to control the energization or de-energization of the coil assembly, as well as the direction of the current flowing through the coil assembly, so as to drive the moving assembly to move along the first direction. Among them, the control circuit board can be integral or split. Preferably, the board surface of the control circuit board is parallel to the first direction and is connected to the electromagnetic operating system 3. Of course, the board surface of the control circuit board can also be perpendicular to the first direction.

[0061] As Figure 3 , 4 As shown in FIGS. 7-9, the electromagnetic operating system 3 includes a coil assembly, a yoke 35 and a moving assembly. The coil assembly is connected to the control circuit board. The controller of the control circuit board controls the current flowing through the coil assembly through a control signal. The current control of the coil assembly includes current on / off, current direction, etc. The coil assembly drives the moving assembly to move between a first position and a second position.

[0062] The coil assembly includes a coil bobbin 31. A yoke 35 is arranged around the outside of the coil bobbin 31. Two coils 34 are wound around the middle of the coil bobbin 31. The two coils 34 are distributed along the axial direction of the coil bobbin 31, that is, the two coils 34 are distributed along the first direction. Each coil 34 is respectively connected to the control circuit board. A moving assembly is slidably assembled in the middle of the coil bobbin 31. The coil bobbin 31 is also provided with two magnets 32. The two magnets 32 are respectively arranged at opposite ends of the coil bobbin 31 (see Figures 3 - 6 ). The magnets 32 and the coils 34 cooperate to drive the moving assembly, so that the moving assembly is attracted to one magnet 32 at the first position and attracted to the other magnet 32 at the second position. Or, the magnets 32 are correspondingly arranged in the middle of the coil bobbin 31 and are located between the two coils 34. The magnets 32 can magnetize the adjacent yoke 35. The coil assembly drives the moving assembly to move between the first position and the second position. When the two magnets 32 are located between the two coils 34, the magnets 32 and the magnetized yoke 35 jointly drive the moving assembly (see Figures 7 - 11 ).

[0063] The moving assembly includes a moving iron core 33. The moving iron core 33 is slidably arranged in the middle of the coil bobbin 31, that is, the moving iron core 33 is located between the two magnets 32. In the energized state, the two coils 34 drive the moving iron core 33 to move between the first position and the second position. At least one end of the driving rod 37 connected to the moving iron core 33 passes through the magnet 32 and extends outside the coil bobbin 31. The driving rod 37 is directly or indirectly drivingly connected to the moving contact assembly of at least one contact unit 2.

[0064] Further, the moving component further includes a driving rod 37. The driving rod 37 is connected to the moving iron core 33, and is driven by the moving iron core 33 to move axially along the coil bobbin 31. At least one end of the driving rod 37 passes through one of the magnets 32 and extends outside the coil bobbin 31, and is used to connect to the moving contact assembly of at least one contact unit 2, so as to realize the driving of the contact unit 2 by the electromagnetic operating system 3. In this embodiment, when the moving component moves to the first position, the contact system of the contact unit 2 is opened, and when the moving component moves to the second position, the contact system of the contact unit 2 is closed.

[0065] Provide the specific structure of the first electromagnetic operating system 3, as Figures 3 - 6 shown. The electromagnetic operating system 3 includes a yoke 35, a coil assembly and a moving component. The coil assembly includes a coil bobbin 31. In the figure, the coil bobbin 31 includes two spaced-apart retaining walls 311. A hollow winding shaft 312 is connected between the two retaining walls 311. A receiving groove is formed in the middle of the surface of each retaining wall 311 facing away from the winding shaft 312. The bottom of each receiving groove communicates with the hollow part of the winding shaft 312. A buffer plate 36 and a magnet 32 are arranged in each receiving groove. Corresponding through holes are formed in the middle of the buffer plate 36 and the magnet 32. The hollow part of the winding shaft 312 serves as a sliding cavity, and the through holes of the buffer plate 36 and the magnet 32 are coaxial with the sliding cavity. A partition 310 is further arranged in the middle of the coil bobbin 31. The partition 310 protrudes along the outer side of the middle of the coil bobbin 31. That is, a partition 310 is protrudingly arranged on the outer side wall of the middle of the winding shaft 312. The partition 310 divides the space between the two retaining walls 311 into two receiving cavities, and the partition 310 divides the middle of the coil bobbin 31 into two parts. Preferably, a limiting groove is formed in the partition 310, and the limiting groove is preferably formed along the circumferential direction of the partition 310.

[0066] A yoke 35 is arranged around the coil assembly, as Figure 3 、 4As shown, the yoke 35 includes two yoke plates. Each yoke plate includes a first straight plate 351 and two second straight plates 352. The first straight plate 351 is correspondingly disposed on one magnet 32. The two second straight plates 352 are respectively disposed on opposite sides of the coil bobbin 31. One end of each second straight plate 352 is connected to one end of the first straight plate 351. The other end of each second straight plate 352 bends and extends towards the middle of the coil bobbin 31. Preferably, the other end of each second straight plate 352 is inserted and limited in the limiting groove of the partition portion 310 to ensure the overall matching stability, so that each yoke plate encloses the accommodating cavity to form a coil 34 installation cavity. Two coils 34 are wound on the winding shaft 312. Each coil 34 is correspondingly located in one coil 34 installation cavity. The two coils 34 are separated by the partition portion 310. At least one perforation coaxial with the sliding cavity is provided on one first straight plate 351. In this embodiment, perforations are provided in the middle of both first straight plates 351.

[0067] The moving assembly includes a moving iron core 33 and a driving rod 37. The moving iron core 33 is slidably assembled in the sliding cavity. A driving rod 37 is disposed in the middle of the moving iron core 33. The two ends of the driving rod 37 respectively extend out from the perforations of the buffer plate 36 and the magnet 32. Both the moving iron core 33 and the driving rod 37 are made of a magnetic conductive material. The moving iron core 33 and the driving rod 37 can be an integral structure or two separate components; as Figure 3 、 4 shown, one end of the driving rod 37 can be directly or indirectly connected to the driving end of a contact support 21 directly or indirectly.

[0068] In this structure, the opposite ends of the two magnets 32 have opposite magnetic polarities. In the energized state, the adjacent ends of the two coils 34 have the same magnetic polarity. A repulsive force is generated between one magnet 32 and the adjacent coil 34, and a magnetic attractive force is generated between the other magnet 32 and its adjacent coil 34. The moving iron core 33 is jointly driven by the repulsive force and the magnetic attractive force, so that the driving force for the moving iron core 33 to move is reliably ensured.

[0069] The specific principle is as Figure 5 、 6 shown. Taking the upper position in the figure as the first position and the lower position in the figure as the second position, the magnet 32 close to the first position is the first magnet 321, the magnet 32 close to the second position is the second magnet 322, the coil 34 close to the first position is the first coil 341, and the coil 34 close to the second position is the second coil 342. In the figure, the N pole of the first magnet 321 faces the S pole of the second magnet 322.

[0070] When a second current is applied, the magnetic pole of the adjacent end of the first coil 341 and the second coil 342 is the S pole, the end of the first coil 341 facing the first magnet 321 is the N pole, and the first magnet 321 is opposite to the N pole of the first coil 341, so that a repulsive force is generated between the two. The end of the second coil 342 facing the second magnet 322 is the N pole, and the second magnet 322 and the second coil 342 are opposite with the N pole and the S pole, so that a magnetic attraction force is generated between the two. The moving iron core 33 is driven by the repulsive force to move away from the first magnet 321, and is driven by the magnetic attraction force to approach the second magnet 322 and remain attracted to the second magnet 322;

[0071] When a first current is applied, the magnetic pole of the adjacent end of the first coil 341 and the second coil 342 is the N pole, the end of the first coil 341 facing the first magnet 321 is the S pole, and the first magnet 321 is opposite to the N pole and the S pole of the first coil 341, so that a magnetic attraction force is generated between the two. The end of the second coil 342 facing the second magnet 322 is the S pole, and the second coil 342 and the second magnet 322 are opposite with the S poles, so that a repulsive force is generated between the two. The moving iron core 33 is driven by the repulsive force to move away from the second magnet 322, and is driven by the magnetic attraction force to approach the first magnet 321 and remain attracted to the first magnet 321, where the first current and the second current are in opposite directions.

[0072] Preferably, when the moving iron core 33 remains attracted to one of the magnets 32, the power supply to the two coils 34 is stopped, which is beneficial to energy saving; the axial length of the moving iron core 33 is greater than the axial length of each coil 34, which is beneficial to each coil 34 applying a driving force to the moving iron core 33 in the energized state. Figure 4 In this case, L2 represents the axial length of the moving iron core 33, and L1 represents the length of the coil 34.

[0073] Combined with Figures 7 - 11 Provide the specific structure of the second electromagnetic operating system 3.

[0074] The electromagnetic operating system 3 includes a coil assembly, a yoke 35 and a moving assembly. The coil assembly includes a coil skeleton 31. The yoke 35 is disposed outside the coil skeleton 31. Two coils 34 are wound around the middle of the coil skeleton 31. The two coils 34 are distributed along the axis of the coil skeleton 31. Two magnets 32 are disposed between the two coils 34 in a limited manner. That is, the two magnets 32 are respectively located on the opposite sides of the middle of the coil skeleton 31 to magnetize the yoke 35, and axially on the coil skeleton 31, the magnets 32 are located between the two coils 34. At this time, the two magnets 32 form a symmetric structure with respect to the central axis of the coil skeleton 31.

[0075] In this structure, the coil bobbin 31 includes two spaced-apart retaining walls 311, between which a hollow winding shaft 312 is connected. The middle part of each retaining wall 311 communicates with the hollow part of the winding shaft 312 respectively. The hollow part of the winding shaft 312 serves as a sliding cavity. A protruding part is also provided in the middle of the coil bobbin 31, which protrudes from the outer side of the middle part of the coil bobbin 31. That is, a protruding part is provided on the outer side wall of the middle part of the winding shaft 312. The protruding part divides the space between the two retaining walls 311 into two accommodating cavities. Inside each protruding part, a magnet cavity 313 is formed. A magnet 32 is arranged in each magnet cavity 313. Preferably, the cavity shapes of the two magnet cavities 313 are irregular, so as to achieve the anti-misassembly function. Further, a limiting boss 314 is arranged in the magnet cavity 313, and the limiting boss 314 can abut against the magnet 32 to limit the magnet 32.

[0076] As Figures 7 - 9 shown, the yoke 35 includes two spaced-apart yoke plates. Each yoke plate is respectively attached to both ends of the coil bobbin 31. Each yoke plate is provided with a through hole for the moving component to pass through, and the through hole communicates with the sliding cavity. The two ends of one of the yoke plates extend along the axial direction of the coil bobbin 31 to form two side plates. The two side plates are located on the opposite sides of the coil bobbin 31 and are connected to the other yoke plate, so that the yoke 35 as a whole forms a closed frame structure.

[0077] In this structure, the moving component is the same as that of the first electromagnetic operating system 3. The moving component includes a moving iron core 33 and a driving rod 37. The moving iron core 33 is slidably assembled in the sliding cavity. A driving rod 37 is arranged in the middle of the moving iron core 33. The two ends of the driving rod 37 respectively extend out from the through holes of the yoke 35 correspondingly. Compared with the first electromagnetic operating system 3, this structure can omit the buffer plate 36, simplify the structure of the yoke 35 at the same time, and correspondingly increase the magnetic field intensity of the yoke 35.

[0078] In this structure, the opposite ends of the two magnets 32 have the same magnetism. In the energized state, the adjacent ends of the two coils 34 have opposite magnetisms. The other end of one coil 34 has the same magnetism as the magnetized yoke 35, and the other end of the other coil 34 has the opposite magnetism to the magnetized yoke 35. The moving iron core 33 is jointly driven by the coil 34 and the magnetized yoke 35.

[0079] The specific principle is as Figure 10 、 11As shown, the upper position in the figure is the first position, and the lower position in the figure is the second position. Among them, the magnet 32 on the left is the first magnet 321, and the magnet 32 on the right is the second magnet 322. The coil 34 near the first position is the first coil 341, and the coil 34 near the second position is the second coil 342. In the figure, the S pole of the first magnet 321 faces the S pole of the second magnet 322.

[0080] When the second current is passed, the magnetic pole at the adjacent end of the first coil 341 and the second coil 342 is the S pole, the magnetic pole at the other end of the first coil 341 is the N pole, and the magnetic pole at the other end of the second coil 342 is the S pole. After the yoke 35 is magnetized, the magnetism on the side facing the first coil 341 and the second coil 342 is the N pole. A repulsive force is generated between the yoke 35 and the first coil 341, and a magnetic attraction force is generated between the yoke 35 and the second coil 342. Thereby, the moving iron core 33 is driven away from the first coil 341, that is, the moving iron core 33 moves towards the second position;

[0081] When the first current is passed, the magnetic pole at the adjacent end of the first coil 341 and the second coil 342 is the N pole, the magnetic pole at the other end of the first coil 341 is the S pole, and the magnetic pole at the other end of the second coil 342 is the N pole. After the yoke 35 is magnetized, the magnetism on the side facing the first coil 341 and the second coil 342 is the N pole. A magnetic attraction force is generated between the yoke 35 and the first coil 341, and a repulsive force is generated between the yoke 35 and the second coil 342. Thereby, the moving iron core 33 is driven close to the first coil 341, that is, the moving iron core 33 moves towards the first position.

[0082] Combined with Figures 2 - 11 A second embodiment providing an in-built switch A is provided.

[0083] As Figure 2 shown, the in-built switch A includes a housing 1. The accommodation cavity inside the housing 1 is divided into a first accommodation cavity 11 and a second accommodation cavity 12 in the first direction. In this embodiment, the lengths of the first accommodation cavity 11 and the second accommodation cavity 12 in the second direction are equal, making the overall housing 1 of the in-built switch A in the shape of a cuboid; An electromagnetic operating system 3 and a contact unit 2 are arranged in the accommodation cavity along the first direction. The electromagnetic operating system 3 and the contact unit 2 are respectively arranged in the first accommodation cavity 11 and the second accommodation cavity 12, and the specific structures of the electromagnetic operating system 3 and the contact unit 2 are the same as those in the first embodiment.

[0084] When the in-built switch A of this embodiment is arranged in the electricity meter B, if the electricity meter B has three-phase main lines, three in-built switches A need to be arranged in the inner cavity 51 of the electricity meter, and each in-built switch A is respectively connected to one-phase main line.

[0085] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is customarily placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0086] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An internal switch, comprising a housing (1), an electromagnetic operating system (3) and at least one contact unit (2), wherein the contact unit (2) at least comprises a contact system, and the contact system comprises a moving contact assembly and a stationary contact group, and is characterized in that: The electromagnetic operating system (3), the moving contact assembly and the stationary contact group are sequentially arranged in a housing cavity of the housing (1) along a first direction. The electromagnetic operating system (3) drives at least one moving contact assembly of a contact unit (2) to move in the first direction to contact or separate from the stationary contact group. The stationary contact group comprises two stationary contacts (23) arranged at intervals in a second direction. Each stationary contact (23) is provided with a wiring portion (231). The wiring portion (231) extends from one end of the housing (1) away from the electromagnetic operating system (3) to the outside of the housing cavity in the first direction. The two wiring portions (231) of the same contact unit (2) are located side by side on the same outer side of the housing (1) away from the electromagnetic operating system (3). The first direction and the second direction are perpendicular to each other.

2. The built-in switch according to claim 1, wherein: It comprises two or more contact units (2), wherein two adjacent contact units (2) are arranged side by side in the second direction.

3. The built-in switch according to claim 1, wherein: The electromagnetic operating system (3) comprises a coil component and a moving component, wherein the coil component drives the moving component to move along a first direction, and the moving component is drivingly connected to a moving contact component of at least one contact unit (2).

4. The built-in switch according to claim 1, wherein: Each contact unit (2) also includes an arc extinguishing system, the arc extinguishing system including two arc extinguishing chambers (24) spaced apart in the second direction, and the moving contact assembly moves along the first direction between the two arc extinguishing chambers (24).

5. The built-in switch according to claim 1, wherein: Each contact unit (2) further comprises a sampling device (4), wherein the sampling device (4) is arranged outside the accommodating cavity and connected to one of the wiring portions (231); or, the sampling device (4) is arranged inside the accommodating cavity and electrically connected to one of the stationary contacts (23).

6. The built-in switch according to claim 5, wherein: The two connection parts (231) of the same static contact group are divided into an incoming line part and an outgoing line part, and all sampling devices (4) are connected to the incoming line part or to the outgoing line part.

7. The built-in switch according to claim 1, wherein: It comprises at least two contact units (2) arranged side by side in a second direction, and two adjacent moving contact assemblies are linked and connected.

8. The built-in switch according to claim 1, wherein: The accommodating chamber is divided into a first accommodating chamber (11) and at least one second accommodating chamber (12); an electromagnetic operating system (3) is installed in the first accommodating chamber (11); a contact unit (2) is arranged in each second accommodating chamber (12); and two adjacent second accommodating chambers (12) are arranged side by side in a second direction.

9. The built-in switch according to claim 8, characterized in that: All the second accommodating chambers (12) form a symmetrical structure with respect to the central axis of the first accommodating chamber (11).

10. Electric energy meter, including at least one main line of a phase, characterized in that: At least one built-in switch (A) as claimed in any one of claims 1 to 9 is arranged in the inner cavity (51) of the electric energy meter, and each contact unit (2) is connected to a phase main line.

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