Large-current motor type load switch mutual inductor assembly

Abstract

The utility model provides a large-current motor type load switch mutual inductor assembly. The large-current motor type load switch mutual inductor assembly comprises an upper cover, a left side mounting plate, a right side mounting plate, a motor driving module, a left side arc extinguishing cover, a right side arc extinguishing cover and a switch bottom shell. The motor driving module comprises a motor driving module bottom shell, a motor, a worm gear assembly, a double-layer gear assembly, a rack assembly, a spring, a movable contact mounting plate and an E-shaped clamp spring. According to the utility model, the motor driving module is used for controlling the on-off of the movable contact and the static contact, the action is accurate and reliable, the left arc extinguishing chamber and the right arc extinguishing chamber are symmetrically arranged at the joint part of the movable contact and the static contact, in the on-off process, an effect of stretching and breaking an arc can be achieved, and the working reliability is further improved by improving the arc extinguishing capability. On-off state digital signals are provided for the electric energy meter through the microswitch, and the intelligent level of the electric energy meter is improved. A voltage signal is detected through the residual current transformer, and whether electric leakage or electricity stealing occurs or not is indirectly judged.

Description

Technical Field

[0001] The utility model relates to a smart electric meter, in particular to a load switch for a large current electric energy meter and an Internet of Things electric energy meter. Background Art

[0002] Load switches are widely used switching devices in electricity meters. In practical applications, the built-in load switches in 2020 smart meters suffer from issues such as excessive contact resistance and inadequate arc extinguishing capability. When switching high currents beyond the meter's range, the failure rate is high, which can easily lead to switch failure or even complete meter burnout, compromising the meter's safe and stable operation. Therefore, it is crucial to improve the high-current switching capability of the built-in load switches in smart meters. Summary of the Invention

[0003] The technical problem to be solved by the utility model is that a large current motor type load switch mutual inductor assembly can adapt to large current switching conditions, work stably and reliably, and has a leakage detection function.

[0004] To solve the above technical problems, the utility model discloses a high-current motor-type load switch transformer assembly, comprising an upper cover, a left mounting plate, a right mounting plate, a motor drive module, a left arc extinguishing cover, a right arc extinguishing cover, and a switch bottom shell. The left mounting plate comprises a shunt plate, the head of which is riveted with at least one left static contact; the right mounting plate comprises a vertical copper plate, the vertical copper plate being welded with a horizontal copper plate, the head of which is riveted with at least one right static contact. The utility model is characterized in that:

[0005] The motor drive module includes a motor drive module bottom shell, a motor, a worm gear assembly, a double-layer gear assembly, a rack assembly, a spring, a moving contact mounting plate, and an E-type retaining spring;

[0006] A motor worm gear is provided on the main shaft of the motor; the worm gear assembly includes an upper worm gear and a lower worm gear arranged coaxially; the double-layer gear assembly includes an upper gear and a lower gear arranged coaxially; the rack assembly includes a left guide rod and a right guide rod, and a slider is movably provided on the left guide rod and the right guide rod, the front end of the slider is fixedly connected to a moving steel shaft, and the lower part of the moving steel shaft is fixedly connected to a rack extending to the rear end of the slider; the moving contact mounting plate is sleeved on the moving steel shaft, the E-type retaining spring is clamped in the clamping groove at the free end of the moving steel shaft, and the spring is sleeved on the moving steel shaft between the moving contact mounting plate and the slider; at least two moving contacts are riveted to the outer end of the moving contact mounting plate;

[0007] The motor worm gear is in transmission connection with the upper worm gear, the lower worm gear is in transmission connection with the lower gear, and the upper gear is in transmission connection with the rack;

[0008] The left mounting plate and the right mounting plate are both fixed on the switch bottom shell, and the left static contact and the right static contact are symmetrically arranged at the front end of the switch bottom shell; the motor drive module is arranged in the switch bottom shell, and the moving contact on the moving contact mounting plate matches the left static contact and the right static contact; the left arc extinguishing cover and the right arc extinguishing cover are symmetrically arranged on both sides of the moving contact mounting plate on the switch bottom shell.

[0009] Preferably, the head of the shunt plate is riveted with two left static contacts; the head of the horizontal copper plate is riveted with two right static contacts; the outer end of the moving contact mounting plate is riveted with four moving contacts; the four moving contacts are aligned one by one with the two left static contacts and the two right static contacts.

[0010] Preferably, in the disconnected state, the distance between the moving contact and the static contact is greater than 2.75 mm.

[0011] Preferably, a micro switch is further provided in the motor drive module for detecting the contact state between the moving contact and the static contact; a probe rod matching the micro switch is provided at the rear end of the slider, and the probe rod is arranged parallel to the rack.

[0012] Preferably, the left arc extinguishing hood and the right arc extinguishing hood are arranged as overlapping U-shaped structures.

[0013] Preferably, it further comprises a residual current transformer, an insulating spacer, a left copper bar assembly of the residual current transformer, and an L-shaped right copper bar of the residual current transformer;

[0014] The left copper bar assembly of the residual current transformer includes a “]”-shaped copper plate and a phosphor copper pin, and the phosphor copper pin is riveted to the “]”-shaped copper plate;

[0015] The head of the copper bar on the right side of the residual current transformer is connected by butt welding to the head of the “]”-shaped copper plate in the copper bar assembly on the left side of the residual current transformer;

[0016] The vertical copper plate, insulating spacer and the copper bar on the right side of the residual current transformer all pass through the mounting hole in the middle of the residual current transformer. The insulating spacer is arranged between the vertical copper plate and the copper bar on the right side of the residual current transformer to isolate the two.

[0017] The technical advantages of this utility model are as follows: ① This utility model controls the on and off of the moving contact and the static contact through the motor drive module, and the operation is accurate and reliable. The joint of the moving contact and the static contact is symmetrically provided with a left arc extinguishing cover and a right arc extinguishing cover. During the on and off process, it can play the role of stretching and breaking the arc, and further improve the working reliability by improving the arc extinguishing ability. ② A micro switch is provided to provide the electric energy meter with a digital signal of the on and off status, thereby improving the intelligent level of the electric energy meter. ③ The voltage signal is detected by the residual current transformer to indirectly determine whether there is leakage or power theft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the load current flow direction of the large current motor-type relay transformer assembly of the utility model;

[0019] Figure 2 yes Figure 1 Schematic diagram with the top cover and switch bottom shell removed;

[0020] Figure 3 This is an exploded view of the high-current motor-type relay transformer assembly of the utility model;

[0021] Figure 4 This is the exploded view of the motor drive module;

[0022] Figure 5 This is a schematic diagram of the utility model working in the contact disconnected state;

[0023] Figure 6 This is a schematic diagram of the utility model working in the contact-connected state;

[0024] Figure 7 This is a schematic diagram of the explosion of the residual current transformer and the right mounting plate, the left copper bar assembly of the residual current transformer, and the right copper bar of the residual current transformer. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.

[0026] Example 1

[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6As can be seen, the high-current motor-type load switch transformer assembly of this embodiment includes an upper cover 1, a left mounting plate 2, a right mounting plate 3, a motor drive module 4, a left arc-extinguishing cover 5, a right arc-extinguishing cover 5', and a switch bottom housing 6. The left mounting plate 2 includes a shunt plate 200, with at least one left static contact 201 riveted to the head of the shunt plate 200. The right mounting plate 3 includes a vertical copper plate 30, with a horizontal copper plate 31 welded to the vertical copper plate 30, and at least one right static contact 301 riveted to the head of the horizontal copper plate 31.

[0028] The motor drive module 4 includes a motor drive module bottom shell 401 , a motor 402 , a worm gear assembly 403 , a double-layer gear assembly 404 , a rack assembly 406 , a spring 407 , a moving contact mounting plate 408 , and an E-shaped retaining spring 409 .

[0029] The main shaft of the motor 402 is provided with a motor worm gear 402D; the worm gear assembly 403 includes an upper worm gear 403A and a lower worm gear 403B arranged coaxially; the double-layer gear assembly 404 includes an upper gear 404A and a lower gear 404B arranged coaxially; the rack assembly 406 includes a left guide rod 406A and a right guide rod 406A', and a slider 406B is movably provided on the left guide rod 406A and the right guide rod 406A', and the front end of the slider 406B is fixedly connected to a moving steel shaft 406C, the lower part of the moving steel shaft 406C is fixedly connected to a rack 406D extending toward the rear end of the slider 406B; the moving contact mounting plate 408 is sleeved on the moving steel shaft 406C, the E-type retaining spring 409 is clamped in the slot at the free end of the moving steel shaft 406C, and the spring 407 is sleeved on the moving steel shaft 406C between the moving contact mounting plate 408 and the slider 406B; at least two moving contacts 408A are riveted to the outer end of the moving contact mounting plate 408.

[0030] The motor worm gear 402D is in transmission connection with the upper worm gear 403A, the lower worm gear 403B is in transmission connection with the lower gear 404B, and the upper gear 404A is in transmission connection with the rack 406D.

[0031] The motor 402 , worm gear assembly 403 , double-layer gear assembly 404 , and rack assembly 406 are disposed in a motor drive module bottom shell 401 , a motor drive module cover 410 is disposed on the surface of the bottom shell.

[0032] The left mounting plate 2 and the right mounting plate 3 are both fixed to the switch bottom housing 6, and the left static contact 201 and the right static contact 301 are symmetrically arranged at the front end of the switch bottom housing 6; the motor drive module 4 is arranged in the switch bottom housing 6, and the moving contact 408A on the moving contact mounting plate 408 matches the left static contact 201 and the right static contact 301; the left arc extinguishing cover 5 and the right arc extinguishing cover 5' are symmetrically arranged on both sides of the moving contact mounting plate 408 on the switch bottom housing 6.

[0033] In this embodiment, two left static contacts 201 are riveted to the head of the shunt plate 200; two right static contacts 301 are riveted to the head of the horizontal copper plate 31; four moving contacts 408A are riveted to the outer end of the moving contact mounting plate 408; the four moving contacts 408A are aligned one by one with the two left static contacts 201 and the two right static contacts 301.

[0034] In the disconnected state, the distance between the moving contact and the stationary contact is greater than 2.75 mm. Specifically, the free end faces of the four moving contacts 408A are flush with each other, the free end faces of the two left stationary contacts 201 and the two right stationary contacts 301 are flush with each other, and the distance between the free end faces of the moving contacts and the free end faces of the stationary contacts is greater than 2.75 mm.

[0035] As a preferred embodiment, the motor drive module 4 is further provided with a microswitch 405 for detecting the contact state between the moving contact and the stationary contact. A probe 406E, which matches the microswitch 405, is provided at the rear end of the slider 406B and is arranged parallel to the rack 406D. When the moving contact 408A separates from the stationary contact, the slider 406B retreats relative to the stationary contact. At this point, the microswitch 405 button is compressed by the probe 406E, disconnecting the two pins of the microswitch 405. The smart energy meter MCU receives the signal and determines that the load switch is in the closed state. Conversely, when the slider 406B advances relative to the stationary contact, the microswitch 405 button is released, indicating that the load switch is in the closed state.

[0036] The left and right arc-extinguishing hoods 5 and 5' are configured as overlapping U-shaped structures. Specifically, each of the left and right arc-extinguishing hoods 5 and 5' includes multiple arc-extinguishing plates with U-shaped cross-sections. The openings of the multiple arc-extinguishing plates gradually increase in size and overlap with each other in the width direction of the mounting plate 408. The openings of the multiple arc-extinguishing plates are all oriented toward the centerline of the mounting plate 408.

[0037] The working principle of this embodiment is as follows:

[0038] When the large current motor load switch transformer assembly of this embodiment is installed along the plumb line, the motor drive module 4 is an up and down motion mechanism, which plays the role of connecting and disconnecting the main circuit.

[0039] The transmission mechanism consists of an upper worm gear 403A, a lower worm gear 403B, an upper gear 404A, and a lower gear 404B. The upper and lower worm gears 403A and 403B are coaxially fixed, while the upper and lower gears 404A and 404B are coaxially fixed. The input of the transmission mechanism is connected to the motor worm gear 402D on the main shaft of the motor 402 via the upper worm gear 403A, and the output is connected to the slider 406B via the rack 406D. Therefore, the rotation of the main shaft of the motor 402 is transmitted to the slider 406B through the transmission mechanism, driving it forward or backward. The moving steel shaft 406C and the mounting plate 408 follow the movement of the slider 406B.

[0040] Action process: Figure 5 As can be seen, a positive DC 15V pulse current with a pulse width of 150ms (current direction from positive welding pin 402A to negative welding pin 402B) is applied to motor 402, causing it to rotate at high speed. The worm gear 402D mounted on the motor shaft also rotates clockwise in sync with it. This rotation is transmitted through the transmission mechanism, driving slider 406B downward. When rack 406D moves upward along left guide rod 406A and right guide rod 406A' to the disengaged position, moving contact 408A on moving contact mounting plate 408 contacts left stationary contact 201 on left mounting plate 2 and right stationary contact 301 on right mounting plate 3, respectively. The contact voltage is generated by the compression and deformation of spring 407. Simultaneously, microswitch 405 automatically pops open, connecting pin 2 of the switch to a conductive state. The smart energy meter MCU receives the signal and determines that the load switch is closed.

[0041] like Figure 6 Conversely, applying a reverse 15V DC pulse current with a pulse width of 150ms to motor 402 (current direction from negative welding pin 402B to positive welding pin 402A) causes motor 402 to rotate at high speed, and worm gear 402D to rotate counterclockwise in sync. The transmission mechanism converts the high-speed axial rotation of motor 402 into downward movement of the rack. When rack 406D moves downward along left guide rod 406A and right guide rod 406A' to the disengaged state, moving contact 408A on moving contact mounting plate 408 disconnects from left stationary contact 201 on left mounting plate 2 and stationary contact 301 on right mounting plate 3, respectively. Simultaneously, the button of microswitch 405 is compressed, disconnecting pin 2 of the switch. The smart energy meter MCU receives the signal and determines that the load switch is in the off state.

[0042] When the main circuit is connected and AC power is present, an arc will be generated at the moment of disconnection. The arc will move toward the left and right arc extinguishing covers. The U-shaped left and right arc extinguishing covers 5 and 5' can stretch and disconnect the arc.

[0043] Example 2

[0044] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 It can be seen that the high-current motor-type load switch transformer assembly of this embodiment further includes a residual current transformer 7, an insulating spacer 8, a residual current transformer left copper bar assembly 9 and an L-shaped residual current transformer right copper bar 10.

[0045] The left copper bar assembly 9 of the residual current transformer includes a “]”-shaped copper plate 900 and a phosphor copper pin 901, and the phosphor copper pin 901 is riveted to the “]”-shaped copper plate 900.

[0046] The copper bar 10 on the right side of the residual current transformer is configured to be L-shaped, and the tail portion thereof is used to connect to a copper terminal.

[0047] The head of the copper bar 10 on the right side of the residual current transformer is connected to the head of the “]”-shaped copper plate 900 in the copper bar assembly 9 on the left side of the residual current transformer by butt welding.

[0048] The vertical copper plate 30, the insulating spacer 8, and the copper bar 10 on the right side of the residual current transformer all pass through the mounting hole in the middle of the residual current transformer 7. The insulating spacer 8 is arranged between the vertical copper plate 30 and the copper bar 10 on the right side of the residual current transformer to isolate the two.

[0049] The residual current transformer 7 is mainly used for leakage current detection. Its working principle is combined with Figure 1 and Figure 2 Note: Load switch terminal ① is connected to the left mounting plate 2, load switch terminal ② is connected to the right mounting plate 3, terminal ③ is connected to the "]"-shaped copper plate 900, and terminal ④ is connected to the right copper bar 10 of the residual current transformer.

[0050] The load current flows from the incoming L line through the load switch terminal ①, exits from the load switch terminal ②, and connects to the user's L line. After passing through the load, it flows back from the user's N line to terminal ④, then passes through the right copper bar 10 of the residual current transformer, the left copper bar assembly 9 of the residual current transformer, and terminal ③ to return to the incoming N line. The vertical copper plate 30 of the right mounting plate 3 and the right copper bar 10 of the residual current transformer are insulated from each other and pass through the mounting hole in the middle of the residual current transformer 7. The currents of the vertical copper plate 30 and the right copper bar 10 of the residual current transformer are equal in magnitude but opposite in direction. If the currents differ, a voltage signal of a certain amplitude will be generated on the secondary side of the residual current transformer 7. The energy meter will detect this voltage signal and determine whether there is leakage or power theft.

[0051] In this embodiment, the left guide rod 406A has a sufficient length to support its two ends on the motor drive module bottom shell 401. The right guide rod 406A' is shorter than the left guide rod 406A so that there is enough space around it to accommodate other components such as the residual current transformer 7.

[0052] The specific implementation methods of the present invention include but are not limited to the above-mentioned embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and modifications based on the present invention, but still fall within the scope of protection of the present invention.

Claims

1. A large current motor type load switch mutual inductor assembly, comprising an upper cover (1), a left side mounting plate (2), a right side mounting plate (3), a motor drive module (4), a left side arc extinguishing cover (5), a right side arc extinguishing cover (5'), and a switch bottom shell (6), wherein the left side mounting plate (2) comprises a shunt plate (200), and the head of the shunt plate (200) is riveted with at least one left side static contact (201); the right side mounting plate (3) comprises a vertical copper plate (30), a horizontal copper plate (31) is welded on the vertical copper plate (30), and the head of the horizontal copper plate (31) is riveted with at least one right side static contact (301), characterized in that: The motor drive module (4) comprises a motor drive module bottom shell (401), a motor (402), a worm gear assembly (403), a double-layer gear assembly (404), a rack assembly (406), a spring (407), a moving contact mounting plate (408), and an E-shaped retaining spring (409); The main shaft of the motor (402) is provided with a motor worm gear (402D); the worm gear assembly (403) includes an upper worm gear (403A) and a lower worm gear (403B) which are coaxially arranged; the double-layer gear assembly (404) includes an upper gear (404A) and a lower gear (404B) which are coaxially arranged; the rack assembly (406) includes a left guide rod (406A) and a right guide rod (406A'), wherein a slider (406B) is movably provided on the left guide rod (406A) and the right guide rod (406A'), and a moving steel bar is fixedly connected to the front end of the slider (406B). The movable steel shaft (406C) is fixedly connected to a rack (406D) extending toward the rear end of the slider (406B) at its lower portion; the movable contact mounting plate (408) is sleeved on the movable steel shaft (406C); the E-shaped retaining spring (409) is clamped in a slot at the free end of the movable steel shaft (406C); the spring (407) is sleeved on the movable steel shaft (406C) between the movable contact mounting plate (408) and the slider (406B); at least two movable contacts (408A) are riveted to the outer end of the movable contact mounting plate (408); The motor worm gear (402D) is in transmission connection with the upper worm gear (403A), the lower worm gear (403B) is in transmission connection with the lower gear (404B), and the upper gear (404A) is in transmission connection with the rack (406D); The left mounting plate (2) and the right mounting plate (3) are both fixed on the switch bottom shell (6); the left static contact (201) and the right static contact (301) are symmetrically arranged at the front end of the switch bottom shell (6); the motor drive module (4) is arranged in the switch bottom shell (6); the moving contact (408A) on the moving contact mounting plate (408) matches the left static contact (201) and the right static contact (301); the left arc extinguishing cover (5) and the right arc extinguishing cover (5') are symmetrically arranged on both sides of the moving contact mounting plate (408) on the switch bottom shell (6).

2. The high-current motor-type load switch transformer assembly according to claim 1, characterized in that: The head of the diverter plate (200) is riveted with two left static contacts (201); the head of the horizontal copper plate (31) is riveted with two right static contacts (301); the outer end of the movable contact mounting plate (408) is riveted with four movable contacts (408A); the four movable contacts (408A) are aligned one by one with the two left static contacts (201) and the two right static contacts (301).

3. The high-current motor load switch transformer assembly according to claim 1, characterized in that: In the disconnected state, the distance between the moving contact and the static contact is greater than 2.75mm.

4. The high-current motor load switch transformer assembly according to claim 1, wherein: A micro switch (405) is also provided in the motor drive module (4) for detecting the contact state between the moving contact and the static contact; a probe rod (406E) matching the micro switch (405) is provided at the rear end of the slider (406B), and the probe rod (406E) is arranged parallel to the rack (406D).

5. The high-current motor-type load switch transformer assembly according to claim 1, characterized in that: The left arc extinguishing hood (5) and the right arc extinguishing hood (5') are arranged as overlapping U-shaped structures.

6. The high-current motor load switch transformer assembly according to claim 1, characterized in that: It also includes a residual current transformer (7), an insulating spacer (8), a left-side copper bar assembly of the residual current transformer (9), and an L-shaped right-side copper bar of the residual current transformer (10); The left copper bar assembly (9) of the residual current transformer comprises a "]"-shaped copper plate (900) and a phosphor copper plug pin (901), wherein the phosphor copper plug pin (901) is riveted to the "]"-shaped copper plate (900); The head of the copper bar (10) on the right side of the residual current transformer is butt-welded to the head of the "]"-shaped copper plate (900) in the copper bar assembly (9) on the left side of the residual current transformer; The vertical copper plate (30), the insulating spacer (8), and the copper bar (10) on the right side of the residual current transformer all pass through the mounting hole in the middle of the residual current transformer (7); the insulating spacer (8) is arranged between the vertical copper plate (30) and the copper bar (10) on the right side of the residual current transformer to isolate the two.

Images