SU1214996A1 - Furnace roller - Google Patents

Description

The invention relates to the mechanical equipment of heating and heat-treatment furnaces of ferrous metallurgy and can also be used in other branches of the national economy when transporting products in furnaces during their heat treatment.

The purpose of the invention is to increase the operational durability of the roller.

An increase in the operational durability of a roller is determined by such characteristics as the intensity and uniformity of cooling of the role drum to the cooling components supplied to it. In this case, it is possible to reduce the total annual costs of repairs to the furnaces and increase the overall efficiency of the unit.

FIG. shows a roller with tubes for coolant inlet, longitudinal section; figure 2 - section aa in fig, (section of a roller along a curved tube;; in fig. 3 - section bb in figure 2, the installation of nozzles).

The oven roller contains a floor: a UTO cooled barrel S in the cavity of which a tube 2 is installed for supplying cooling water and an annular channel 3 n, l of coolant outlet.

The roller is provided with an additional tube 4 for supplying air, which is concentrically mounted in the central tube S, and the end sections of these tubes are bent and supplied with outlet parts with Laval nozzles 5 si 6, and the output end of the nozzle 6 of the additional tube is placed in a critical section 7 of the nozzle 5 with water. the tubes, the end curved sections of the tubes are mounted tangentially to the inner surface of the barrel in the zone opposite to the outlet end of the annular channel 3.

The roller operates as follows: Barrel 1 is given a rotational movement, with the tubes 2 and 4 remaining stationary.

During the rotation of the roller, the compressed gas with a pressure exceeding w; kc cooling pressure; liquidity by 2-3 MPa, enters through tube 4 and expires at high speed from the nozzle 6 installed at the critical section 7 of the nozzle 5. Through tube 2 enters fluid that in the critical state 7 of the nozzle 5 is mixed

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with gazsm, will form a gas-burned mixture,

Since the gas jet creates a resolution, the velocity of the liquid outflow is higher than its outflow only due to its own energy, pressure,. fluid throughput increases.

It is known that with adiabatic expansion of the gas, its temperature drops. Experimental studies have shown that the water-air mixture flowing out of the pipes loses from the initial temperature of f 5 round to 0 s,

The bending of the end sections of the tubes in the plane of the longitudinal axis of the roller at a right angle provides the most Q full coverage of the cooled surface in a flowing stream.

Reducing this angle leads to the appearance of stagnant zones in the cooling. liquid at the surface of the barrel, which reduces the uniformity of its cooling and an increase in this angle leads to an increase in the hydraulic resistance of the coolant supply duct (s).

The next bend of the end sections of the tubes in the plane, perpendicular to the axis of the roller, at an acute angle ensures a smooth flow of the medium onto the surface of the barrel and an intense

35 afterbirth:; smooth twist of flow in the ring; azore An increase in the acute angle to the straight line and further leads to a deterioration in the intensity of cooling and, consequently, the durability of the roll, due to the disappearance of the twist of the flow along the neck and the neck.

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Due to the high velocity departure from the nozzle, the highly saturated and turbulent flow of the cooler, due to the installation under the sharply curved sections of the tubes, acquires intensive rotational motion on the inner surface of the barrel and produces an efficient and uniform heat removal.

The degree of dispersion of the flow of the coolant is high, its speed is high, the absence of stagnant zones and the low flow rate of cooling water ensures reliable and economical and economical cooling roller barrels.

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The use of the proposed roller roller improves its operational durability.

By varying the flow rate of compressed gas, it is possible to regulate the rate of the cooler over a wide range. those. respond quickly to changes in the magnitude of the heat flux.

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The proposed technical solution provides for the removal of a significant amount of heat and can be used in units with limited coolant resources, or when the pressure of a fluid with HC-imeme pressure is to increase its cooling rate.

BUT

Phage. /:

.-. s

VNIIPI Order 900/5

“Yilial ShSh Patent%, Uzhgorod, ul, Proektna, 4

Circulation 561

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Claims (2)

1. A HEAT ROLLER containing a chilled barrel, a pipe for supplying cooling water located along the axis of the roller, forming an annular channel for draining water with the barrel of the roller, <puat 1t, characterized in that, in order to increase the operational durability of the roller, it is equipped with an additional tube for supplying air concentrically installed in the tube for supplying water, the end sections of these tubes are bent and made in the form of Laval nozzles, and the outlet end of the nozzle of the additional tube is placed in the critical section of the nozzle of the tube for supplying water. 2. Roller pop. 1, characterized in that the end sections of the tubes are bent sequentially in a plane, the longitudinal axis of the roller ’, at a right angle and in a plane perpendicular to the axis of the roller, at an acute angle. 1,121