3. Structural design of high-power liquid resistance starter
3.1, technical requirements analysis
It is not difficult to see from the above-mentioned special technical requirements that the first product structure must first have a large enough electrolyte tank to meet the starting requirements of not less than 40 times per day. The structure of the second electrolyte tank can not only It satisfies the electrode (moving and setting plate) assembly for installing the series resistance, and also needs heat exchange during internal and external circulation; the third has a larger frame to meet the installation of all parts; the fourth has one or more The transmission mechanism that can meet the above time requirements can meet the requirements of different speeds.
3.2, the product's structural plan
According to the above technical requirements and its functional configuration requirements, the structure of the liquid resistance starter for starting a high-power wound-wound motor needs to be composed of five parts, namely an electrolyte box assembly part, a support frame part, a plate assembly part, a transmission mechanism part, Part of the circulatory system. The bottom of the product structure is the electrolyte box assembly part, the upper part of the electrolyte tank is the part of the support frame assembly, the upper part is the transmission mechanism part, the pole plate assembly is set inside the electrolyte box assembly, and the circulation system part is set to the right of the electrolyte tank rear.
The electrolyte box assembly of the product comprises an external steel welding electrolyte tank and an electrolyte tank with an insulating material inside; an electrode plate assembly is placed in the insulating electrolyte barrel, and a plate guiding mechanism is arranged; and the moving plate is lifted. The lifting frame is installed in the supporting frame, and the top and bottom frequency conversion motor drives the forward and reverse of the transmission mechanism to realize the rise and fall of the moving plate. A counterweight for balancing the moving plate assembly is provided at the front of the support frame to maintain balance in use.
3.3, key technology research
In order to achieve its functional requirements, the most important part of the product structure is how the transmission mechanism meets the technical requirements is the key; other parts are configured around the transmission mechanism and starting requirements to achieve the overall performance requirements. The following mainly focuses on the movement process and design requirements of the transmission mechanism.
In order to meet the requirements of starting and speed regulation of wound asynchronous motors, the conventional liquid resistance starter products use a type of transmission mechanism such as a pulley driven screw drive and a worm gear reducer to drive the screw to achieve the rise of the moving plate in the insulated water tank. Downward movement, the transmission is in the form of fixed speed transmission, and the speed cannot be adjusted in a wide range.
The ultra-high-power wound asynchronous motor has a special starting requirement, and the starting time is long. The moving plate in the liquid resistance starter product that is serially inserted moves downward at the V1 speed until the motor starts to the rated speed; when the motor starts, the side The circuit breaker is quickly closed, and the moving plate of the liquid resistance starter is required to be quickly raised at the V2 speed to the corresponding position of the motor at the n-speed for the next motor starting to the rated speed; when the motor starts again, the moving plate Move at V3 speed until the motor reaches the rated speed; after completing the subsequent number of starts in sequence, return to the highest position (corresponding to “0” speed) at Vn speed before stopping every day.
