Heat exchange – Regenerator – Movable heat storage mass with enclosure
Patent
1998-07-15
2000-03-14
Atkinson, Christopher
Heat exchange
Regenerator
Movable heat storage mass with enclosure
165 6, 165 10, F23L 1502
Patent
active
060359269
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Hydraulic motors of the slow moving type are usually designed to be very sturdy and adapted to sustain hard stress. Therefore they have proved to be very suitable for the low speed turning of the rotary air preheater.
Therefore they have been mounted in the casing of the heat exchanger just outside the radial bearing with the rotating part of the hydraulic motor secured to the end of the hub. The hub is, however, subject to very high mechanical stress, partly caused by the strong temperature variations present in a regenerative heat exchanger. This shows itself a.o. by bending motions of the hub resulting in a tendency of the fastening of the hydraulic motor to the casing to break apart by radially directed forces emanating from the radial bearing.
This drawback has been eliminated by making the attachment of the motor flexible for radial forces and non-rotatable to all other forces, as shown in U.S. Pat. No. 3,687,192. This solution has proved not quite reliable due to endurance damages to the motor attachment.
OBJECT OF THE INVENTION
The object of the invention is to achieve a rotary, regenerative heat exchanger with a hydraulic motor motion that avoids the above mentioned drawbacks.
This has been achieved according to the invention in a simple way in that said radial bearing is the hydraulic motor with its built-in bearing means. No bending forces can occur because the radial bearing and the bearing of the motor is one and the same bearing. Moreover, the combination of motor and radial bearing is less space consuming and easier to mount as compared to previously known structures where the particular radial bearing needs provision of lubricating oil pipes and maintenance demanding seals and so on.
DETAILED DESCRIPTION
A preferred embodiment of the invention will now be described with reference to the accompanying drawings, in which
FIG. 1 is a perspective view by way of example of an embodiment of a rotor with portions cut away to show the hub of the rotor with upper and bottom bearings,
FIG. 2 is a longitudinal section through the upper part of the hub and adjacent parts of the rotor and the casing of the heat exchanger and with the cup of the motor cut away, and
FIG. 3 is an end view of a particularly suitable hydraulic motor with its bottom portion cut away for showing the interior parts of the motor.
FIG. 1 discloses schematically a rotor 1 with a portion cut away to show the vertical, cylindrical hub 2, the bottom portion of which is supported by a thrust bearing 3 and the top portion of which is guided by a hydraulic motor 4 provided with a built-in radial bearing 26 (shown in FIG. 3). The motor is fixedly mounted in a cap 5, which is bolted to the casing 6 of the heat exchanger via brackets 30, as shown in FIG. 2. Only the upper and the bottom bearings and upper and bottom sector plates and associated sealing means are shown of the casing 6, since the casing is a known, conventional casing.
Suitable hydraulic motors are available on the market in different designs. FIG. 2 shows a hydraulic motor 4 with a stationary part 7 fixedly attached to the inside of the roof 8 of the cap 5. The housing 9 of the motor is rotatably journalled to the stationary part 7 by the built-in radial bearings 26 shown in FIG. 3, and has a bottom part fitted in the open top end of the hub 2 which is provided with a flange 10 to which the rotatable housing 9 of the motor is attached. Connections 11,12 (FIG. 1) to a pressure oil pipe 13 and a return pipe 14 are located on the roof 8 of the cap 5 (FIG. 2) for driving the hydraulic motor 4.
The essential parts of the interior of the hydraulic motor 4 are shown in FIG. 3. The inside of the housing 9 is provided with a wave shaped, closed cam surface 21 against which an even number of cam rolls 22 are arranged to roll. The cam rolls 22 are directed axially and are rotatably journalled in a cylinder block 24 fixedly attached to the part 7.
Pressure oil is supplied to the motor 4 from a pressure oil pipe 13 and via a valve plate 25 to the piston
REFERENCES:
patent: 3687192 (1972-08-01), Pettersson
patent: 4418742 (1983-12-01), Conde et al.
patent: 4557318 (1985-12-01), Bellows
patent: 4627485 (1986-12-01), Osborn
patent: 5482108 (1996-01-01), Essle et al.
ABB Air Preheater Inc.
Atkinson Christopher
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