Heating furnace of annular component

Abstract

The invention provides a heating furnace of an annular component. A first guide partition plate, a second guide partition plate and a third guide partition plate are sequentially arranged inside a furnace body from top to bottom; a first airflow passage, a second airflow passage, a third airflow passage and a fourth airflow passage are sequentially formed between the top inner wall of the furnace body and the first guide partition plate, between the first guide partition plate and the second guide partition plate, between the second guide partition plate and the third guide partition plate and between the third guide partition plate and the bottom inner wall of the furnace body; airflow heating accelerators are arranged inside the second airflow passage and the fourth airflow passage; a first centrifugal impeller is arranged between the first guide partition plate and the second guide partition plate; a fifth airflow passage is formed by the upper and lower surfaces and the outer side wall of the annular component, and the top and bottom inner walls and the inner side wall of the furnace body; the first centrifugal impeller drives a gas to flow in circulating manner; the gas enters the second airflow passage from the air outlet of the first centrifugal impeller, hits against the inner side wall of the annular component after passing through the airflow heating accelerators, sequentially flows through the third airflow passage, the fourth airflow passage, the fifth airflow passage and the first airflow passage, and then enters the air inlet of the first centrifugal impeller. According to the heating furnace, the annular component can be specifically heated, and the energy consumption is relatively low.

Description

technical field [0001] The present invention relates to furnaces, and more particularly to furnaces for annular components. Background technique [0002] Some annular components need to be heated before mechanical assembly, and the typical annular components are bearings. In the field of wind turbine manufacturing, large-mass and large-size bearings need to be heated in a process called "shrink fitting". [0003] At present, the resistance heating furnace is generally used to heat the ring parts. The resistance heating furnace uses circulating hot air as the heat transfer medium. The thermal method transfers heat to the bearing. It adopts a composite heat transfer method that uses hot air as the heat transfer medium to conduct convective heat transfer on the bearing surface, supplemented by radiation heat transfer. Such as figure 1 As shown, it is a structural schematic diagram of an existing heating furnace. The furnace body of the existing heating furnace is divided int...

AI Technical Summary

Problems solved by technology

[0005] 1. The gas used to exchange heat with the ring parts in the furnace accounts for a relatively low proportion of all the gases in the furnace body, that is, a large part of the gas in the furnace body does not actually convect heat with the ring parts, and the heating furnace is not compact for the ring parts , resulting in a large energy consumption of the heating furnace, but the heat transfer rate is very low

Especially when the flow rate of the airflow is higher, the airflow will give priority to the path of "less obstruction", so that the surface of the annular part is actually not directly washed by the hot air in the high-speed airflow area in the flow field, so the heating furnace The heating efficiency of the ring part is low, and the temperature rise of the ring part is slow

[0006] 2. When the hot air passes through the ring part, it "sweeps" the ring part from the outside to the inside, and the inner side wall of the ring part is the assembly surface. In the prior art, the inner side wall of the ring part becomes the lee of the hot air flow On the other hand, the inner wall of the annular part is not directly and fully washed by the hot air flow. Therefore, the existing heating furnace is not targeted at heating the surface of the annular part, and the design is not combined with the structural characteristics of the annular part itself.

[0007] 3. When the hot air flows through the outer wall, upper surface and lower surface of the annular component, it just "sweeps" across, and the airflow scours these surfaces without directionality. According to the field synergy theory of enhanced heat transfer, such The scouring method makes the field coordination of convective heat transfer at these surfaces poor, and the heat transfer coefficient of these surfaces is small, resulting in high energy consumption of the heating furnace

[0008] 4. When the hot air passes through the annular part, it will flow through several surfaces in sequence. Since the air flow will release heat and cool down during the flushing process, the temperature of the hot air flushing different surfaces is not the same, and for the same The temperature of the hot air scoured at different positions on the surface is also different, so generally speaking, there is a large difference in the quality of the airflow (airflow velocity and airflow temperature) used to scour the various positions of the annular component, and the heating of the annular component is not the same. Unevenness, resulting in radial asymmetry of the thermal stress of the ring component, which will inevitably lead to asymmetric deformation of the ring component and radial deformation is not maximized

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