Online treatment method and equipment for manufacturing inner cavity of radiator for high-voltage transformer

Abstract

The invention discloses an online treatment method and equipment for manufacturing an inner cavity of a radiator for a high-voltage transformer. The online treatment method is characterized in that anID code and CNC information are added to a workpiece online; a program controls each processing time interval to be 5-8min and the transmission speed to be 8-12m / min; the surface is subjected to descaling and shot blasting, the workpiece enters a station of air-free full-hydraulic flow inner cavity flushing equipment, a flushing fluid is kept and a leakage test is carried out in a pressurizing manner; hot air is drawn into the workpiece and enters an inner cavity to draw paint; when the vacuum degree is 200-500Pa, a vacuum valve is automatically closed and a paint pipe valve of a lower-opening flange of the workpiece is opened and stands for 1-3min; a vacuum relief valve of an upper flange opening is automatically opened and the paint in the inner cavity returns to a paint can; the air isdrawn, the paint in the inner cavity is dried through a vacuum method under 1,000Pa; a diluent in a paint film in the inner cavity is quickly separated out of the surface by using negative pressure;and a gaseous diluent is drawn into a recovery filter device to recover the diluent. Linear continuous production is kept and the problem of production of the existing radiator industry is relativelywell solved.

Description

technical field [0001] The invention relates to the field of processing, high-voltage transformer manufacturing, in particular to an on-line processing method for the inner cavity of a sheet radiator for high-voltage transformers. Background technique [0002] At present, the inner chamber treatment process for manufacturing radiators for high-voltage and extra-high-voltage transformers adopts an off-line step-by-step process. [0003] 1. After the heat sink is formed and welded, the inner cavity is inflated and airtight, and then according to the relevant process regulations, it is placed in the water tank to observe the air bubbles to find the leakage point of the product and repair welding to achieve the non-leakage performance of the product. [0004] 2. During the production process of the radiator, there will be welding slag and debris inside. After the radiator is connected to the transformer, the transformer coil cooling oil in the transformer communicates with the i...

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Problems solved by technology

[0005] However, the characteristic of the radiator is that there are many channels and narrow gaps through which the cooling oil in the inner cavity flows, and the cross-sectional area of ​​all channels is several times larger than the cross-sectional area of ​​the inlet and outlet. After the liquid enters the inner cavity through the liquid pump, it will pass through the nearest channel or part of the channels When the flow is collected to the outlet, there will be air bubbles or air in the channel that is not filled with liquid, and it is difficult to clean the foreign matter out of the radiator. Although the pressure of the liquid pump is increased to a certain extent, there is still air in most channels and cannot be realized. All channels filled with flushing liquid flow

Therefore, the current process has low efficiency and high energy consumption, which is the bottleneck of production and has not been solved.

Since the low efficiency has become the bottleneck of the production process, so far this production process has not realized online production, and can only implement a step-by-step production method.

[0006] 3. After the inner cavity is flushed and cleaned, it is necessary to pour paint on the inner cavity to prevent the inner cavity from rusting. If rust occurs, rust spots may appear, and the metal slag that peels off the rust spots will fall off the inner cavity, which will endanger the safety of the high-voltage transformer.

[0008] These two processes have obvious disadvantages: under normal pressure, the liquid is baked at a temperature above 150°C, the vaporized liquid remains in the inner cavity of the radiator, and the steel base surface of the inner cavity is cooled after leaving the drying chamber at the baking temperature. In the unprotected state before painting, the surface of the inner cavity steel is prone to oxidation

The disadvantage of this method is: due to the large area of ​​the inner cavity of the radiator, there are many channels and narrow gaps, it takes a long time to stand for blowing, especially for the inner cavity paint to be specially dried at about 100°C for several hours, and the inner cavity The diluent in the paint may not even be discharged, so the painting link is a production bottleneck that consumes energy, emits pollution from exhaust gas, and consumes time

Another defect is: due to the incomplete drying of the inner cavity mentioned in the above 3, tiny air bubbles may remain in the cavity gap far away from the inlet and outlet. This method of injecting paint from the lower port with air pressure only repeatedly fills the bubble problem. Difficult to remove tiny air bubbles

[0011] To sum up, the current radiator production process consumes a lot of energy, the production process is long, the process bottleneck is large, the efficiency is low, and there are many hidden dangers. Automated online production

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