Motor direct drive mechanism of on-load tap-changer
Through the motor direct drive mechanism, the drive motor and reducer are used to control the switch, which solves the wear and sticking problems of the on-load tap changer during the shifting process, realizes fast and reliable switching, improves safety and reduces costs.
Patent Information
- Application Number
- CN202422878103.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-23
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-23
AI Technical Summary
Existing on-load tap changers have problems such as wear and sticking during the shifting process, resulting in inaccurate switching time and even causing transformer explosion.
The motor direct drive mechanism is adopted, which is directly connected to the main shaft of the switching switch through the driving motor and the reducer. The reducer is used to control the rapid switching of the switching switch, replacing the traditional spring energy storage structure. Combined with the worm gear reducer and the adapter connection, it ensures the reliable drive of the main shaft.
It achieves fast and reliable switching of the transfer switch, reduces wear and the risk of jamming, improves safety, simplifies design and maintenance, reduces costs, and increases the reliability of the backup power supply.
Smart Images
Figure CN223413964U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of power equipment technology, and in particular to a motor direct drive mechanism of an on-load tap changer. Background Art
[0002] An on-load tap-changer is a voltage-regulating device designed to change the tapping connection position of a transformer winding, operated while the transformer is energized or under load. Its basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns in the winding, or in other words, the transformer's voltage ratio, ultimately achieving voltage regulation.
[0003] In related technologies, the diverter switch is the key on-off control component of an on-load tap changer. Single and even contact groups alternately select the tap. The spring in the quick-release mechanism stores energy and quickly releases it, driving the diverter switch contact system to complete a switching operation. While the spring energy storage in the quick-release mechanism does enable rapid switching between single and double contacts, the purely mechanical operation inevitably results in wear and tear, generating metal shavings that contaminate the transformer oil. If the quick-release mechanism's parts are not properly machined, there's a chance that the guide rails and other mating components within the quick-release mechanism will become stuck during movement, leading to delayed switching or, more seriously, premature release of the quick-release mechanism. This can cause not only damage to the on-load tap changer but also a high risk of transformer explosion.
[0004] In response to the above-mentioned related technologies, in order to effectively cut off the load current during the shifting process of the tap changer and ensure a smooth shifting process, the applicant proposed the concept of a motor-driven switching switch and designed a motor-driven mechanism for the on-load tap changer. Utility Model Content
[0005] In order to effectively cut off the load current during the shifting process of the tap changer and ensure a smooth shifting process, the present application provides a motor direct drive mechanism for an on-load tap changer, which has the characteristics of ingenious structure, simple installation, and improved safety factor, and is suitable for the diverter switch in the on-load tap changer.
[0006] The motor direct drive mechanism of an on-load tap changer provided in this application adopts the following technical solution:
[0007] A motor direct drive mechanism for an on-load tap changer comprises a switching switch, a drive motor, and a reducer; a main shaft is rotatably provided inside the switching switch to drive the switch to switch, and the main shaft passes through the top of the switching switch; the reducer and the drive motor are both fixed to the top of the switching switch, and the reducer is arranged between the drive motor and the main shaft for transmission.
[0008] By adopting this technical solution, the drive motor is directly connected to the main shaft of the toggle switch via a reducer, allowing the switch to quickly switch into position. The motor's speed can be controlled using a reducer of appropriate ratio. The reducer reduces the drive motor's rotational speed to the desired number of revolutions, generating a high torque that can reliably drive the main shaft for switching. Direct motor drive replaces the traditional spring energy storage structure, effectively preventing issues such as severe output waveform bouncing and inadequate release of the rapid mechanism caused by weak spring force, stuck mechanism guide rails, and other mechanisms. The reducer is a purchased component, and the deceleration requirements can be modified to meet the standard switching time range of each switch in conventional products.
[0009] Optionally, the reducer is a worm gear reducer, the upper end of the main shaft is inserted into the center hole of the worm wheel of the reducer and a flat key is provided for circumferential fixation.
[0010] By adopting the above technical solution, the worm gear reducer has a compact mechanical structure, light size and appearance, small size and high efficiency. The worm gear reducer is easy to install, flexible and light, has excellent performance, and is easy to maintain and repair. The worm gear reducer runs smoothly, has low noise, is durable, has strong usability, and is safe and reliable, which helps to improve the safety of the on-load tap changer.
[0011] Optionally, an adapter is also included, one end of which is set as a sleeve that is plugged into the main shaft, and the other end of the adapter is set as a connecting shaft that is plugged into the center hole of the worm gear of the reducer, and a keyway is set on the circumferential side wall of the connecting shaft.
[0012] By adopting the above technical solution and setting an adapter to connect the main shaft and the reducer, the design difficulty and cost can be reduced, and the main shaft structure does not need to be modified too much, thereby reducing manufacturing costs; the reducer can directly purchase general gears on the market without the need for special customization, thereby reducing procurement costs.
[0013] Optionally, a screw hole is formed through the side wall of the sleeve, and a locking screw that abuts against the main shaft is screwed into the screw hole.
[0014] By adopting the above technical solution, the shaft sleeve of the adapter and the main shaft are circumferentially fixed by arranging locking screws, the circumferential connection is more precise, and the transmission is more reliable.
[0015] Optionally, it also includes an oil chamber matching the switching switch, the switching switch is arranged in the oil chamber, the outer shell of the oil chamber is provided with a mounting hole for installing the switching switch, and an oil chamber top cover is installed on the mounting hole to close the mounting hole; the switching switch is fixed on the oil chamber top cover, and the main shaft passes through the oil chamber top cover; the reducer and the drive motor are fixed on the top of the oil chamber top cover.
[0016] By adopting the above technical solution, the motor and reducer equipment are fixed on the top cover of the oil chamber and will not be immersed in the oil along with the switch, which is convenient for detection and maintenance.
[0017] Optionally, a rotary seal is provided between the main shaft and the oil chamber top cover.
[0018] By adopting the above technical solution, a rotary seal is provided to ensure the sealing performance of the oil chamber.
[0019] Optionally, the reducer is a worm gear reducer, and an annular mounting platform is coaxially provided on the oil chamber top cover corresponding to the main shaft, and the reducer is fixed on the mounting platform.
[0020] By adopting the above technical solution, the worm gear reducer structure is flat, and the provision of a protruding mounting platform facilitates the installation and fixation of the reducer.
[0021] Optionally, it further includes a battery or a battery pack, which is electrically connected to the drive motor as a backup power supply; a battery rack for mounting the battery or battery pack is fixed outside the oil chamber.
[0022] By adopting the above technical solution, the drive motor is connected to the power cord and powered by an external power supply under normal conditions; when a power outage occurs due to external factors, the added battery or battery pack can be used as a backup power source, which can be directly powered on and can also prevent the motor from stopping working in the event of an emergency.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] 1. This application discloses a device that uses a motor-driven switch to achieve rapid switching. The drive motor is directly connected to the main shaft of the switch through a reducer to control the switch's rapid switching. The motor's speed can be controlled by using a reducer with an appropriate ratio. The reducer reduces the number of revolutions of the drive motor to the desired number of revolutions and generates a large torque, which can reliably drive the main shaft for switching. The direct motor drive replaces the traditional spring energy storage structure, effectively preventing problems such as severe output waveform bounce and inadequate release of the rapid mechanism caused by a series of mechanisms such as weak spring force and stuck guide rails.
[0025] 2. Setting up an adapter to connect the main shaft and reducer can reduce design difficulty and cost. The main shaft structure does not need to be modified too much, which reduces manufacturing costs. The reducer can directly purchase general gears on the market without the need for special customization, which reduces procurement costs.
[0026] 3. The motor and reducer are fixed on the top cover of the oil chamber and will not be immersed in the oil along with the switch, making it easy to detect and maintain;
[0027] 4. The added battery or battery pack serves as a backup power source. The drive motor can be powered directly or used in the event of an unexpected power outage. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;
[0029] Figure 2 This is a schematic diagram of the structure of the drive motor and reducer in Example 1 of the present application;
[0030] Figure 3 This is a schematic diagram of the installation structure of the adapter in Example 2 of the present application.
[0031] Figure numerals: 1. Switch; 11. Spindle; 2. Oil chamber; 21. Mounting hole; 3. Drive motor; 4. Reducer; 5. Adapter; 51. Bushing; 511. Screw hole; 512. Locking screw; 52. Connecting shaft; 521. Keyway; 6. Oil chamber top cover; 61. Mounting platform; 7. Battery pack. DETAILED DESCRIPTION
[0032] An embodiment of the present application discloses a motor direct drive mechanism for an on-load tap changer.
[0033] Example 1
[0034] Reference Figure 1 A motor direct drive mechanism of an on-load tap changer includes a switch 1, an oil chamber 2 matched with the switch 1, a reducer 4, a drive motor 3 and a battery pack 7.
[0035] A main shaft 11 is rotatably provided inside the switch 1 to drive the switch to switch, and the main shaft 11 passes through the top of the housing of the switch 1.
[0036] The oil chamber 2 is a cavity containing transformer oil. A mounting hole 21 for the diverter switch 1 is defined at the top of the housing. The diverter switch 1 is inserted through the mounting hole 21 and submerged within the oil chamber 2. A top cover 6, sealing the mounting hole 21, is bolted to the housing of the oil chamber 2. The diverter switch 1 is also bolted to the bottom of the cover 6. The main shaft 11 extends through the cover 6, with a rotary seal between the main shaft 11 and the cover 6.
[0037] refer to Figure 1 and Figure 2The reducer 4 is a worm gear reducer, and the reducer 4 is arranged between the drive motor 3 and the main shaft 11 for transmission; the worm of the drive motor 3 is coaxially fixed with the reducer 4, and the upper end of the main shaft 11 is inserted into the center hole of the worm wheel of the reducer 4 and a flat key is provided for circumferential connection; the reducer 4 and the drive motor 3 are mounted on the top of the oil chamber top cover 6 with bolts; due to the different heights of the reducer 4 and the drive motor 3, a protruding annular mounting platform 61 is coaxially provided on the oil chamber top cover 6 corresponding to the main shaft 11, and the reducer 4 is fixed on the mounting platform 61.
[0038] A battery pack 7 is provided as a backup power source for the drive motor 3 ; a sheet metal bracket can be fixed outside the oil chamber 2 as a battery rack, and the battery pack 7 is fixed on the battery rack.
[0039] The implementation principle of Example 1 is as follows: the drive motor 3 is directly connected to the main shaft 11 of the switch 1 through the reducer 4 to control the switch 1 to switch into position quickly. The motor speed can be controlled by using a reducer 4 of appropriate ratio; the reducer 4 reduces the number of revolutions of the drive motor 3 to the desired number of revolutions and obtains a large torque, which can reliably drive the main shaft 11 to switch on and off; the motor direct drive replaces the traditional spring energy storage structure, effectively preventing the serious output waveform bounce and the problem of the rapid mechanism not releasing into position caused by a series of mechanisms such as weak spring force and stuck guide rails. The added battery pack 7 serves as a backup power source, and the drive motor 3 can be used directly with power or by using the backup power source in the event of an unexpected power outage.
[0040] Example 2
[0041] Reference Figure 3 The difference between this embodiment and embodiment 1 is that it further includes an adapter 5, and the main shaft 11 and the reducer 4 are connected through the adapter 5.
[0042] One end of the adapter 5 is provided with a sleeve 51 which is plugged into the main shaft 11, and a screw hole 511 is opened through the side wall of the sleeve 51, and a locking screw 512 which abuts the main shaft 11 is screwed into the screw hole 511; the other end of the adapter 5 is provided with a connecting shaft 52 which is plugged into the center hole of the worm gear of the reducer 4, and a keyway 521 is provided on the circumferential side wall of the connecting shaft 52, and a flat key is installed in the keyway 521.
[0043] The implementation principle of Example 2 is: an adapter 5 is provided to connect the main shaft 11 and the reducer 4. The small-sized adapter 5 is adapted to the main shaft 11 and the reducer 4 respectively, which helps to reduce production costs and manufacturing difficulty.
[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A motor direct drive mechanism for an on-load tap changer, comprising a switch (1), characterized in that: It also includes a drive motor (3) and a reducer (4); a main shaft (11) is rotatably provided inside the switching switch (1) to drive the switch to switch, and the main shaft (11) passes through the top of the switching switch (1); the reducer (4) and the drive motor (3) are both fixed to the top of the switching switch (1), and the reducer (4) is provided between the drive motor (3) and the main shaft (11) for transmission.
2. The motor direct drive mechanism of an on-load tap changer according to claim 1, characterized in that: The reducer (4) is a worm gear reducer, and the upper end of the main shaft (11) is inserted into the worm gear center hole of the reducer (4) and is provided with a flat key for circumferential fixation.
3. The motor direct drive mechanism of an on-load tap changer according to claim 2, characterized in that: It also includes an adapter (5), one end of which is provided as a shaft sleeve (51) that is plug-fitted with the main shaft (11), and the other end of which is provided as a connecting shaft (52) that is plug-fitted with the worm gear center hole of the reducer (4), and a keyway (521) is provided on the circumferential side wall of the connecting shaft (52).
4. The motor direct drive mechanism of an on-load tap changer according to claim 3, characterized in that: A screw hole (511) is provided through the side wall of the shaft sleeve (51), and a locking screw (512) is screwed into the screw hole (511) and abuts against the main shaft (11).
5. The motor direct drive mechanism of an on-load tap changer according to claim 1, characterized in that: The oil chamber (2) is matched with the switching switch (1), the switching switch (1) is arranged in the oil chamber (2), a mounting hole (21) for mounting the switching switch (1) is provided on the outer shell of the oil chamber (2), and an oil chamber top cover (6) is mounted on the mounting hole (21) to close the mounting hole (21); the switching switch (1) is fixed on the oil chamber top cover (6), and the main shaft (11) passes through the oil chamber top cover (6); the reducer (4) and the drive motor (3) are fixed on the top of the oil chamber top cover (6).
6. The motor direct drive mechanism of an on-load tap changer according to claim 5, characterized in that: A rotary seal is provided between the main shaft (11) and the oil chamber top cover (6).
7. The motor direct drive mechanism of an on-load tap changer according to claim 5, characterized in that: The reducer (4) is a worm gear reducer, and an annular mounting platform (61) is coaxially provided on the oil chamber top cover (6) corresponding to the main shaft (11), and the reducer (4) is fixed on the mounting platform (61).
8. The motor direct drive mechanism of an on-load tap changer according to claim 5, characterized in that: It also includes a battery or a battery pack (7), which is electrically connected to the drive motor (3) as a backup power source; and a battery rack for mounting the battery or battery pack (7) is fixed outside the oil chamber (2).