Intelligent electric meter load switch equipped with arc extinguishing device

Abstract

The utility model provides an intelligent electric meter load switch equipped with an arc extinguishing device. The intelligent electric meter load switch comprises an upper cover, a left side mounting plate, a right side mounting plate, a motor driving module, a lateral 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 lateral 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, the 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.

Description

TECHNICAL FIELD

[0001] The utility model relates to an intelligent electric meter, in particular to a heavy current electric energy meter and load switch for internet of things electric energy meter. BACKGROUND

[0002] The load switch is a kind of switch device widely used in electric energy meter, and in practical application, the contact resistance of the built-in load switch of 20 edition intelligent electric energy meter is large, and it does not have arc extinguishing capacity and other problems.In the large current on-off of exceeding range, the failure rate is higher, and it is easy to cause switch failure even whole meter burning, which affects the safe and stable operation of metering.The built-in load switch of intelligent electric energy meter is necessary to improve the large current switch on-off capacity. SUMMARY

[0003] The utility model provides a kind of load switch of intelligent electric meter equipped with arc extinguishing device, can adapt to heavy current switch working condition, work stable and reliable, and it is beneficial to improve the intelligent management level of electric energy meter.

[0004] To solve the above technical problems, the load switch of intelligent electric meter equipped with arc extinguishing device of the utility model, including upper cover, left side mounting plate, right side mounting plate, motor drive module, lateral arc extinguishing cover, switch bottom shell, bottom arc extinguishing cover assembly, the left side mounting plate includes shunt, and at least one static contact is riveted in the head of shunt;The right side mounting plate includes vertical copper plate, and horizontal copper plate is welded on the vertical copper plate, and at least one static contact is riveted in the head of horizontal copper plate,

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

[0006] Motor worm gear is arranged on the main shaft of the motor;The worm gear assembly includes coaxially arranged upper worm gear and lower worm gear;The double-layer gear assembly includes coaxially arranged upper gear and lower gear;The rack assembly includes left guide rod and right guide rod, and sliding block is movably arranged on the left guide rod and the right guide rod, the front end of the sliding block is fixedly connected with moving steel shaft, and the lower part of the moving steel shaft is fixedly connected with rack extending to the rear end of the sliding block;The moving contact mounting plate is sleeved on the moving steel shaft, the E-shaped clamp spring is clamped in the clamping groove of 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 sliding block;The outer end of the moving contact mounting plate is riveted with at least two moving contacts;

[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 fixed on the switch bottom shell, and the static contacts of the shunt head and the static contacts of the horizontal copper plate head are symmetrically arranged at the front end of the switch bottom shell; the motor driving module is arranged in the switch bottom shell, and the moving contacts on the moving contact mounting plate are matched with the static contacts.

[0009] Preferably, the lateral arc extinguishing cover is arranged on one side of the moving contact mounting plate of the switch bottom shell; and the bottom arc extinguishing cover assembly is arranged on the switch bottom shell between the moving contacts and the static contacts.

[0010] Preferably, left ceramic rods and right ceramic rods are arranged on the switch bottom shell on both sides of the bottom arc extinguishing cover assembly, and are used for limiting the moving contact mounting plate.

[0011] Preferably, two static contacts are riveted on the shunt head; two static contacts are riveted on the horizontal copper plate head; four moving contacts are riveted on the outer end of the moving contact mounting plate; and the four moving contacts are matched with the four static contacts.

[0012] Preferably, in the off state, the distance between the moving contacts and the static contacts is greater than 2.75 mm.

[0013] Preferably, a micro switch is further arranged in the motor driving module, and is used for detecting the contact state of the moving contacts and the static contacts; and a probe rod matched with the micro switch is arranged at the rear end of the sliding block, and the probe rod is arranged in parallel with the rack.

[0014] Preferably, the lateral arc extinguishing cover is arranged in an overlapping U-shaped structure.

[0015] The utility model discloses a technical advantage: the utility model discloses a motor driving module controls the on-off of moving contact and static contact, and the opening and closing action is accurate and reliable; the lateral arc extinguishing cover and the bottom arc extinguishing cover assembly are arranged on the combination part of the moving contact and the static contact, can play the role of stretching the broken arc in the on-off process, and the working reliability is further improved by improving the arc extinguishing capacity. The micro switch is arranged and is used for providing the on-off state digital signal to the electric energy meter, and the intelligent level of the electric energy meter is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the utility model;

[0017] Figure 2 It is the explosion state diagram of the utility model;

[0018] Figure 3 It is the explosion diagram of the motor driving module;

[0019] Figure 4 It is the schematic diagram of the utility model working in the contact on state;

[0020] Figure 5 This is a schematic diagram of the present invention in the contact-open state. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As can be seen, the smart meter load switch equipped with an arc-extinguishing device in this embodiment includes an upper cover 1, a left mounting plate 2, a right mounting plate 3, a motor drive module 4, a lateral arc-extinguishing cover 5, a switch bottom shell 6, and a bottom arc-extinguishing cover assembly 7. The left mounting plate 2 includes a current shunt 20, and the head of the current shunt 20 is riveted with at least one stationary contact. The right mounting plate 3 includes a vertical copper plate 30, and a horizontal copper plate 31 is welded onto the vertical copper plate 30. The head of the horizontal copper plate 31 is riveted with at least one stationary contact.

[0024] The motor drive module 4 includes a motor drive module base 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-type snap ring 409.

[0025] The motor 402 has a motor worm gear 402D mounted on its main shaft; the worm gear assembly 403 includes an upper worm gear 403A and a lower worm gear 403B coaxially arranged; the double-layer gear assembly 404 includes an upper gear 404A and a lower gear 404B coaxially arranged; the rack assembly 406 includes a left guide rod 406A and a right guide rod 406A', with a slider 406B movably mounted 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 motor... A movable steel shaft 406C is fixedly connected to a rack 406D extending towards the rear end of a slider 406B; a movable contact mounting plate 408 is fitted onto the movable steel shaft 406C; an E-type snap ring 409 is snapped into a groove at the free end of the movable steel shaft 406C; a spring 407 is fitted onto the movable steel shaft 406C between the movable contact mounting plate 408 and the slider 406B; at least two movable contacts are riveted to the outer end of the movable contact mounting plate 408.

[0026] The motor worm gear 402D is connected to the upper worm gear 403A, the lower worm gear 403B is connected to the lower gear 404B, and the upper gear 404A is connected to the rack 406D.

[0027] The motor 402, worm gear assembly 403, double-layer gear assembly 404, and rack assembly 406 are disposed inside the bottom shell 401 of the motor drive module, and a motor drive module cover 410 is provided on its surface.

[0028] The left mounting plate 2 and the right mounting plate 3 are both fixed on the switch base 6. The stationary contacts at the head of the shunt plate 20 and the stationary contacts at the head of the horizontal copper plate 31 are symmetrically arranged at the front end of the switch base 6. The motor drive module 4 is arranged inside the switch base 6, and the moving contacts on the moving contact mounting plate 408 are matched with the stationary contacts.

[0029] The lateral arc-extinguishing cover 5 is disposed on one side of the moving contact mounting plate 408 on the switch base 6; the bottom arc-extinguishing cover assembly 7 is disposed on the switch base 6 between the moving contact and the stationary contact. In this embodiment, the bottom arc-extinguishing cover assembly 7 includes three sets of U-shaped arc-extinguishing covers arranged side by side, and the opening of the U-shaped arc-extinguishing cover is disposed on the moving contact side.

[0030] The bottom arc extinguishing cover assembly 7 has a left ceramic rod 8 and a right ceramic rod 8' on the switch bottom shell 6 on both sides, which are used to limit the moving contact mounting plate 408 and prevent it from deflecting during movement.

[0031] The head of the shunt plate 20 is riveted with two stationary contacts; the head of the horizontal copper plate 31 is riveted with two stationary contacts; the outer end of the moving contact mounting plate 408 is riveted with four moving contacts; the four moving contacts are matched with the four stationary contacts.

[0032] The contact surfaces of both the stationary and moving contacts are designed as arc surfaces. It should be noted that the central axis of the arc surface of the stationary contact is parallel to but not collinear with the central axis of the arc surface of the moving contact, thereby increasing the contact area between the stationary and moving contacts to reduce resistance.

[0033] 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 are flush with each other, the free end faces of the four stationary contacts 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.

[0034] The motor drive module 4 is also equipped with a micro switch 405 for detecting the contact state between the moving contact and the stationary contact; the rear end of the slider 406B is provided with a probe 406E that matches the micro switch 405, and the probe 406E is arranged parallel to the rack 406D.

[0035] The lateral arc-extinguishing cover 5 is configured as an overlapping U-shaped structure. Specifically, each lateral arc-extinguishing cover 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 each other in the width direction of the moving contact mounting plate 408. The openings of the multiple arc-extinguishing plates all face one side of the moving contact mounting plate 408.

[0036] The working principle of this utility model:

[0037] When the smart meter load switch equipped with an arc-extinguishing device is installed along a vertical line, the motor drive module 4 is a vertical movement mechanism that serves to connect and disconnect the main circuit.

[0038] 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 worm gear 403A and lower worm gear 403B are coaxially fixed, as are the upper gear 404A and lower gear 404B. The input end 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 end is connected to the slider 406B via the rack 406D. Therefore, the rotation of the main shaft of the motor 402 can be transmitted to the slider 406B through the transmission mechanism, driving it forward or backward. The moving steel shaft 406C and the moving contact mounting plate 408 move with the slider 406B.

[0039] Action process: such as Figure 4 As can be seen, when a positive DC 15V pulse current with a pulse width of 150ms is applied to the motor 402 (current direction from positive welding pin 402A to negative welding pin 402B), the motor 402 rotates at high speed. The motor worm gear 402D mounted on the motor shaft rotates clockwise synchronously. The rotational motion is transmitted through the transmission mechanism, driving the slider 406B to move. When the rack 406D moves upward along the left guide rod 406A and the right guide rod 406A' to the disengaged state, the moving contact on the moving contact mounting plate 408 contacts the stationary contacts on the left mounting plate 2 and the right mounting plate 3, respectively. The contact voltage is generated by the compression deformation of the spring 407. At the same time, the micro switch 405 button automatically pops open, the second lead of the switch is turned on, and the smart energy meter MCU receives the signal and determines that the load switch is in the closed state.

[0040] like Figure 5Conversely, when a reverse DC 15V pulse current with a pulse width of 150ms is applied to motor 402 (current direction from negative electrode welding pin 402B to positive electrode welding pin 402A), motor 402 rotates at high speed, and motor worm gear 402D rotates counterclockwise synchronously. The transmission mechanism converts the high-speed axial rotation of motor 402 into the downward movement of rack. When rack 406D moves downward along left guide rod 406A and right guide rod 406A' to the disengaged state, the moving contact on moving contact mounting plate 408 disconnects from the stationary contacts on left mounting plate 2 and right mounting plate 3, respectively. At the same time, the micro switch 405 button is compressed, the second lead of switch is disconnected, and the smart energy meter MCU receives the signal and determines that the load switch is in the off state.

[0041] When the main circuit is in the connected state and there is AC power, a certain electric arc will be generated at the moment of disconnection. The electric arc will move towards the side arc extinguishing shield and the bottom arc extinguishing shield. At this time, the side arc extinguishing shield 5 and the bottom arc extinguishing shield assembly 7 can play the role of stretching and disconnecting the electric arc.

[0042] The specific embodiments of this utility model include, but are not limited to, the above-described embodiments. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these still fall within the protection scope of this utility model.

Claims

1. A smart meter load switch equipped with an arc-extinguishing device, comprising a top cover (1), a left mounting plate (2), a right mounting plate (3), a motor drive module (4), a lateral arc-extinguishing cover (5), a switch bottom shell (6), and a bottom arc-extinguishing cover assembly (7), wherein the left mounting plate (2) includes a shunt plate (20), the head of which is riveted to at least one stationary contact; the right mounting plate (3) includes a vertical copper plate (30), a horizontal copper plate (31) is welded onto the vertical copper plate (30), the head of which is riveted to at least one stationary contact, characterized in that: The motor drive module (4) includes a motor drive module base 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-type snap ring (409); The motor (402) has a motor worm gear (402D) mounted on its main shaft; the worm gear assembly (403) includes an upper worm gear (403A) and a lower worm gear (403B) coaxially arranged; the double-layer gear assembly (404) includes an upper gear (404A) and a lower gear (404B) coaxially arranged; the rack assembly (406) includes a left guide rod (406A) and a right guide rod (406A'), and a slider (406B) is movably mounted on the left guide rod (406A) and the right guide rod (406A'), with the front end of the slider (406B) fixedly connected to... A moving steel shaft (406C) is provided, with a rack (406D) extending towards the rear end of a slider (406B) fixedly connected to its lower part; a moving contact mounting plate (408) is fitted onto the moving steel shaft (406C); an E-type snap ring (409) is snapped into a groove at the free end of the moving steel shaft (406C); a spring (407) is fitted onto the moving steel shaft (406C) between the moving contact mounting plate (408) and the slider (406B); at least two moving contacts are riveted to the outer end of the moving contact mounting plate (408). The motor worm gear (402D) is connected to the upper worm gear (403A), the lower worm gear (403B) is connected to the lower gear (404B), and the upper gear (404A) is connected to the rack (406D). The left mounting plate (2) and the right mounting plate (3) are both fixed on the switch base (6). The stationary contacts at the head of the shunt plate (20) and the stationary contacts at the head of the horizontal copper plate (31) are symmetrically arranged at the front end of the switch base (6). The motor drive module (4) is located inside the switch base (6). The moving contacts on the moving contact mounting plate (408) are matched with the stationary contacts.

2. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: The lateral arc-extinguishing cover (5) is disposed on one side of the moving contact mounting plate (408) on the switch bottom shell (6); the bottom arc-extinguishing cover assembly (7) is disposed on the switch bottom shell (6) between the moving contact and the stationary contact.

3. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: The bottom arc extinguishing cover assembly (7) has a left ceramic rod (8) and a right ceramic rod (8') on the switch bottom shell (6) on both sides, which are used to limit the moving contact mounting plate (408).

4. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: The head of the shunt plate (20) is riveted with two stationary contacts; the head of the horizontal copper plate (31) is riveted with two stationary contacts; the outer end of the moving contact mounting plate (408) is riveted with four moving contacts; the four moving contacts are matched with the four stationary contacts.

5. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: In the disconnected state, the distance between the moving contact and the stationary contact is greater than 2.75 mm.

6. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: The motor drive module (4) is also equipped with a micro switch (405) for detecting the contact state between the moving contact and the stationary contact; the rear end of the slider (406B) is provided with a probe (406E) that matches the micro switch (405), and the probe (406E) is arranged parallel to the rack (406D).

7. The smart meter load switch equipped with an arc-extinguishing device as described in claim 1, characterized in that: The lateral arc-extinguishing shield (5) is configured as an overlapping U-shaped structure.

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