RU2708006C1 - Reverse aerodynamic heater with increased length rotor - Google Patents

Abstract

FIELD: heating equipment.

SUBSTANCE: invention relates to heat engineering, in particular for use in air heating and injection systems in recirculation heating plants, namely in wood kiln driers. Reverse aerodynamic heater with rotor comprises casing 2 with movable flaps 3, by means of which reverse of heated flow is performed without changing direction of rotor 1 rotation. Flap height is 1/4 of casing 2 diameter. Casing 2 is fixed on frame 4. Inside casing 2 there is rotor of increased length 1, having diameter of up to 350 mm, maximum length of rotor is up to 1,400 mm. Rotor comprises blades 5 having radius of bending in accordance with calculation of blades for aerodynamic heating, connected by fastening rings 7, having slots in shape of blades bending, one above, the other from below in pairs, located at distance up to 400 mm, starting and ending with end discs 8, also having slots resting on plate springs 6.

EFFECT: invention allows increasing uniformity of heated air flow along the pile length and width, reducing the flow rate and reducing electric power consumption.

3 cl, 6 dwg

Description

The invention relates to the field of heat engineering, in particular to equipment for heating and forcing air in recirculation heating installations of an aerodynamic type, especially in wood drying chambers.

Existing aerodynamic heaters have a rotor in the form of a wheel of large diameter and short length. Air is sucked in through the middle of the wheel and scattered to the sides. This design provides for a complex organization of the air flow in the heated chambers and a complex design of the heater itself.

The closest in technical essence to the claimed device is an aerodynamic heater company EKAS (patent RU 2042096 C1), in which the rotor is located in a chamber bounded by solid side and end walls and parallel to the end wall, the front wall having a round entrance and adjacent to the side coaxial to the rotor wall outlet. Such an aerodynamic heater makes it possible to divide the air flow heated by the rotor into two parts. One stream enters the chamber cavity, the other is directed at an angle of 180 degrees and through the channel between the partitions and walls it enters the chamber cavity, where it is combined with the first stream. In the chamber cavity, both flows are mixed, rotated 90 degrees, and heated air under pressure flows out of the outlet. Such a heating device creates a stream of heated air with a more uniform flow rate from the outlet, in comparison with heaters with unidirectional air flow.

However, such a device has a complex scheme of air flow, which requires the construction of a special chamber with partitions of complex design, which creates additional resistance to the flow of heated air, as a result, a more powerful electric motor is required to rotate the rotor, which in existing installations is already of high power, increases metal consumption, cost devices and operating costs. Also, this device does not have a reverse flow, which affects the quality of drying a stack of lumber in chamber dryers and has uneven distribution of flow along the length of the dried material.

The technical problem solved by the proposed technical solution is: increasing the efficiency of the heater by simplifying the design, organizing the reverse flow; increasing the uniformity of flow distribution along the width and length of the stack, simplifying the flow pattern, reducing energy consumption, creating drying chambers equipped with aerodynamic heaters, of a fundamentally new design.

The problem is solved in that the reverse aerodynamic heater with a rotor for dryers contains a casing having flaps for organizing a flow reversal and mounted on a frame in which an extended length rotor with a diameter of up to 350 mm is located, the maximum rotor length is up to 1400 mm, the leaf height is 1/4 of the diameter of the casing, and the rotor contains blades having a bending radius to ensure aerodynamic heating, connected by mounting rings having slots in the form of bending of the blades, one on top, the other bottom pairwise, located at a distance of up to 400 mm, starting and ending with end disks, also having slots, abutting disk cup springs.

The heater has a casing that allows you to organize the reverse of the heated stream by changing the shape of the casing, using the existing wings without changing the rotation of the rotor.

The heater rotor is equipped with Belleville springs to compensate for the linear thermal expansion of the blades.

The reversible aerodynamic heater is shown schematically in the drawings, where in FIG. 1 shows a front view of an aerodynamic heater (in accordance with paragraph 1 of the claims). In FIG. 2 shows a cross section of a heater; FIG. 3, 4, 5 and 6 are some variants of its industrial application in aerodynamic heating installations.

The heater contains a rotor 1 located in the casing 2, which is attached to the frame 4. The casing 2 has sashes 3, opening or closing by means of mechanisms or manually, forming a suction and discharge air channels.

The rotor 1 contains blades 5 of increased length, which are connected to the rotor by mounting rings 7 and end disks 8, abutting in the disk springs 6.

The reverse heater for aerodynamic heating contains a casing that is attached to the frame. The casing has movable flaps for organizing the flow reversal without stopping the electric motor by changing the shape of the casing in which the rotor of increased length is located, which makes it possible to increase the uniformity of the flow distribution along the width and length of the stack and simplify the flow pattern. The rotor contains blades of increased length, having a bending radius in accordance with the calculation of the blades for aerodynamic heating, connected by fastening rings having slots in the form of bending of the blades, one on top, the other bottom pairwise, located at a distance of up to 400 mm, starting and ending with end disks, also having slots, abutting against Belleville springs to compensate for thermal expansion and connected to an electric motor.

The rotor of the heater for aerodynamic heating is located in the casing and has a diameter of up to 350 mm and a length of up to 1400 mm. Heaters can be made up sequentially in a block, which will allow you to create heating units depending on the length of the drying chambers (or other installations) or be installed vertically, which will allow you to create drying chambers of a fundamentally new design, having reduced power consumption by reducing the required electric motor power.

In FIG. 1 shows a General view of an aerodynamic heater with a cross section showing the location of the rotor 1 in the casing 2, the frame 4, to which the casing is attached. In FIG. 2 shows a cross-section of a device in which the rotor 1 is located in a casing 2 having sashes 3 and mounted on a frame 4 (in accordance with paragraph 2 of the claims).

In FIG. 3 and 4 show a longitudinal and cross section of a drying unit using the proposed aerodynamic heaters, in which the aerodynamic heater is equipped with an electric motor 14, and the guard 15 has a door 12, a screen 13. Inside the heated material 11 is placed.

In FIG. 5 and 6 show the vertical arrangement of the aerodynamic heater in the drying chambers. In FIG. 5 is a longitudinal sectional view of a top view of a drying chamber with a vertically positioned aerodynamic heater having a guard 15 and a door 12. A heated material 11 is placed inside.

Reverse aerodynamic heater operates as follows.

When the rotor 1 rotates, air is sucked in through the inlet channel 9 of the casing and enters the interscapular cavities of the rotor and due to aerodynamic heating, which occurs due to blades of increased length, having a bending radius, made in accordance with the calculation of the blades for aerodynamic heating and moving along an arc of a circle, is ejected into the outlet channel 10, while the flap of the input channel 3 is open, and the output is closed, leaving only a gap. To change the direction of flow (reverse), the shutter 3 of the inlet channel closes and the outlet opens, thus forming an inverted shape of the housing 1 and the flow of heated air moves in the opposite direction. The sash control is carried out using rods 16, manually or using mechanisms.

The presence in the aerodynamic heater of a casing of a varying shape makes it possible to control the reverse by means of flaps, which increases the uniformity of heating of the heated material.

In FIG. 3-6 shows the operation of the heater in the forest kilns. In FIG. 3, 4 in forest kilns with a longitudinal arrangement of a heater with a rotor of increased length. A uniform flow of air from the outlet channel 10 of the heater passes through a stack of lumber 11, is sucked into the inlet channel 9, passing through the heater is heated and again sent to the outlet channel 10, then the cycle repeats. The same scheme of operation in drying chambers with a vertical heater (Fig. 5, 6).

The flow of air in the forest kilns (Fig. 3, 4 and Fig. 5, 6) is shown by arrows.

The use of the claimed device with the indicated design parameters ensures a stable uniform flow, in a simpler way with less energy. As a result, the task of improving the quality of heat-air treatment with a lower speed of the heated stream is solved.

Claims (3)

1. A reversible aerodynamic heater with a rotor, for dryers, containing a casing having flaps for organizing the flow reversal and mounted on a frame in which an increased length rotor is located, having a diameter of up to 350 mm, the maximum rotor length is up to 1400 mm, the leaf height is 1 / 4 the diameter of the casing, and the rotor contains blades having a bending radius to ensure aerodynamic heating, connected by mounting rings having slots in the form of a bend of the blades, one on top, the other bottom pairwise located on Distance to 400 mm, starting and ending with end disks also having slots in abutting the Belleville springs. 2. The heater according to p. 1, characterized in that it has a casing that allows you to organize the reverse of the heated stream by changing the shape of the casing, using the existing wings without changing the rotation of the rotor. 3. The heater according to claim 1, characterized in that the rotor is equipped with Belleville springs to compensate for the linear thermal expansion of the blades.

Images