Rotary expansible chamber devices – Non-metallic working member – cylinder or partition – Resilient
Patent
1996-12-12
1998-07-21
Vrablik, John J.
Rotary expansible chamber devices
Non-metallic working member, cylinder or partition
Resilient
418170, F04C 210, F04C 500
Patent
active
057826234
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an internal toothed belt pump, in particular an internal toothed belt pump which, being self-priming, can deliver and meter even non-lubricating fluids at a regulated speed in the medium pressure range.
Originally pumps had been developed for delivering water. It was possible for the few technical requirements resulting therefrom to be met with a small number of different types. Nowadays, a large number of different types of pumps are required in order to satisfy the specific requirements of the many areas of use for all kinds of fluids. Pups can be divided into two principal groups, the group of rotary pumps and the group of positive-displacement pumps.
Rotary pumps are suitable for the delivery of widely varying, even non-lubricating fluids, but they are generally not self-priming and they are not suitable as regulated-speed pumps over the entire range of speeds.
Positive-displacement pumps, primarily toothed gear pumps and screw spindle pumps, like the other known positive-displacement pumps, are sensitive to foreign bodies and are not suitable for non-lubricating fluids, without particular precautions being taken.
Among positive-displacement pumps, U.S. Pat. No. 2,745,355 discloses a toothed belt pump having a plurality of toothed pulleys which are in engagement with a toothed belt. In that pump, the suction chamber and the pressure chamber must be separated from each other by separate spacer portions. DE-C-25 60 128 discloses a pump with a delivery belt which circulates on two belt pulleys. That toothed belt pump involves an operating principle which is different from that of U.S. Pat. No. 2,745,355 insofar as an alteration to the curvature of the path of movement means that the working chambers which are disposed between the tooth tips change in cross-section. DE-C-42 18 148 describes a toothed belt pump with a belt pulley and two belt guide rollers which bear laterally thereagainst and which provide for circulatory movement of an endless toothed belt with outwardly facing teeth, within the pump casing. By virtue of the arrangement of the toothed belt pulley with the laterally disposed guide rollers, the toothed belt which passes therearound is subjected to a considerable flexural change with counter-flexing, and that can result in material fatigue and belt fracture after a certain period of operation.
DE-A-25 58 074 already discloses an internal toothed belt pump whose mode of operation is similar to the pump disclosed in DE-C-25 60 128.
The object of the invention is to design an internal toothed belt pump which while being self-priming can also deliver and meter non-lubricating fluids at a regulated speed in the medium pressure range.
That object is attained by providing a casing having an inside wall which in one portion has a first radius and the remainder of the inside wall is formed of a second radius. A toothed pulley positioned in the cylindrical casing and is rotatable. A drive shaft is mounted in the casing. The drive shaft is positively connected to the toothed pulley so as to be able to rotate the toothed pulley. Furthermore, a toothed belt having an internal tooth configuration is provided which can accommodate the first and second radii of the inside wall of the casing. Two guide rollers are rotatably mounted in the casing and provide support against the back of the toothed belt so that the toothed belt fully engages the external tooth configuration of the toothed pulley. The region of fall engagement of the teeth of the pulley and the belt is denoted as the engagement region. A suction chamber and a pressure chamber lie on either side of the engagement region.
The invention will be further described hereinafter by means of an embodiment and illustrated with reference to drawings.
FIG. 1 is a front view and section of an internal toothed belt pump,
FIG. 2 is a front view of a toothed belt pump with casing cover screwed thereon,
FIG. 3 shows a detail on an enlarged scale in the region of the tooth engagement of the toothed belt and the toothed pulley, and
FIG. 4 s
REFERENCES:
patent: 2745355 (1956-05-01), Mosbacher
patent: 5032069 (1991-07-01), Parsons
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