Drying and gas or vapor contact with solids – Apparatus – Reversible or pulsating treating gas or vapor flow
Patent
1989-02-21
1990-04-17
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Reversible or pulsating treating gas or vapor flow
34222, 34231, 415127, F26B 2106
Patent
active
049168320
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a device for reversing an air flow in a drying chamber where the air flow is created by at least one blower.
In drying chambers for e.g. drying of wood there is a need of reversing the direction of the air flow in the drying chamber during a drying process. A reversal of the direction of the air flow is desired in order to obtain a continuous and rapid drying of the wood.
As a rule, the air flow is created by means of one or more blowers and the circulating air is normally heated by means of a heating device of some type, e.g. one or more so-called heating batteries. According to known technology the reversal of the air flow is effected for instance by turning the blowers so that these operate in different directions in dependence on the desired air flow direction. The blowers can be mounted on a common support frame which is then arranged rotatably. It is also previously known to change the air flow direction by adjusting a number of dampers or doors arranged at one or more stationary blowers.
SUMMARY OF THE INVENTION
It is the object of this invention to provide a device for reversing the air flow, this device being very reliable and, moreover, having a very simple structure.
The blower or blowers can be designed for one single direction of rotation or working direction by means of the inventive device, resulting in that the blower can be made more efficient simultaneously as no reversal is necessary with accompanying recurrent restarts of the driving motor of the blower. Moreover, the reversal of the air direction by means of the inventive device is very soft which is also advantageous. Furthermore, there is a great freedom of choosing the position of heat batteries about the blowers as the latter are stationary. Also, there are no difficulties in drawing the required connection lines to the heat batteries and blower motors.
BRIEF DESCRIPTION OF THE DRAWING
Illustrative examples of the invention will be described below with reference to the appended drawings, wherein:
FIG. 1 shows a horizontal section of a drying chamber provided with an inventive device,
FIG. 2 shows a vertical section of a part of the drying chamber,
FIG. 3 shows a section of the inventive device taken along the line III--III according to FIG. 2, and
FIGS. 4 and 5 show schematically the inventive device in its two different working positions.
DETAILED DESCRIPTION
FIG. 1 shows a drying chamber with four walls 1-4 and an aperture 5 provided with a door. Within the drying chamber there is a wall 6 extending between the floor 7 and roof 8 of the drying chamber and defining in this way a passage 9 from the part of the drying chamber where the wood to be dried is placed. In FIG. 1 four piles of wood 10 are shown as an example thereof.
A plurality of stationary blowers 20 is arranged in the passage 9 which preferably consist of axial fans operated by electric motors (not shown). A so-called heat battery 21 fed by hot water (not shown) is arranged close to the blowers 20, the object of which is to heat the air circulating in the drying chamber. The heat battery 21 is arranged on the suction side of the blowers 20. Moreover, shields 22 for air control are arranged at the blowers 20. According to the invention a rotatable cylinder/drum 23, for instance made of a relatively thin sheet, is disposed about the stationary blower-heat battery device. The drum 23 is arranged to be rotatable about its longitudinal shaft 24. The drum 23 is provided with apertures 25, 26 in its casing surface which apertures provide an air flow through the drum. Sealing shields 27 are disposed between the heat battery 21 and the drum 23 which are intended to prevent an undesired air leakage.
A roof shield 29 is connected with the heat battery 21, the object of which is to seal the upper end of the drum 23. Similarly, it is also possible to arrange a floor shield connected with the heat battery 21 and sealing the lowermost end of the drum 23, but in many cases it is as suitable to use the floor 7 of the dryin
REFERENCES:
patent: 2055073 (1936-09-01), Ferre
patent: 3065553 (1962-11-01), Olin
patent: 3477139 (1969-11-01), Hildebrand
Bennet Henry A.
Sollecito John
Utec S.M. AB
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