Rotary expansible chamber devices – Grooved abutting cylinder-rotating member end surfaces – Non-working fluid directed to groove
Patent
1980-08-22
1982-10-26
Vrablik, John J.
Rotary expansible chamber devices
Grooved abutting cylinder-rotating member end surfaces
Non-working fluid directed to groove
418 78, 418 80, 418206, F01C 118, F01C 2100, F04C 218, F04C 1500
Patent
active
043559646
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a gear pump, and more particularly to a gear pump having a pair of intermeshing gears in a housing and constructed for discharging a fluid with a reduced amount of entrained air therein.
BACKGROUND ART
When a positive displacement pump having a pair of intermeshing spur gears is used for scavenging purposes on a vehicle traversing uneven terrain there is often an excessive amount of entrained air present in the fluid discharged from the pump. This is understandable because the inlet tube to the pump can be out of full communication with the fluid in the auxiliary tank or reservoir so that air is ingested. Alternatively, the fluid that is in the auxiliary reservoir can contain an excessively high amount of entrained and dissolved air, in which case the pump simply passes the undesirably aerated fluid to the main supply tank of the parent supply system. Once the aerated fluid is in the parent supply system the operation of the associated controls and components can be adversely influenced. Hence there is a need for a scavenge or sump pump that can receive highly aerated fluid, that can separate a high portion of the air for return to the auxiliary tank, and that can subsequently route fluid with an acceptable level of entrained air to the main supply tank.
Furthermore, such an improved pump should be simple in construction for economic reasons, should be compact to make the best use of available space, and should be effective in operation.
Of general interest to these problems is U.S. Pat. No. 3,526,470 to V. E. Swanson on Sept. 1, 1970 which discloses a low speed pump for circulating a viscous liquid food product and permitting the escape of trapped gases from the product. Since in that pump construction gas can exit only in a very narrow angular region from the unfilled spaces in the rotor pockets, the pump would be relatively ineffective for handling oil. If oil was being pumped undesirable pressure and fluid losses would occur, and intermittent pressure surges would result at the discharge port. Moreover, there is no teaching or suggestion of utilizing centrifugal forces and/or fluid pressure forces to encourage air bubble migration radially inwardly for any substantial angular portion of the individual gear cavities.
More representative of the gear pump art is U.S. Pat. No. 2,541,010 to G. A. Ungar on Feb. 6, 1951. That patent shows a gear pump having cross connected pressure and suction balancing ports. However, it is not constructed for separating air bubbles from the oil, collecting the highly air entrained fluid, and then communicating that fluid outwardly of the pump and away from the inlet or outlet ports. It is merely typical of a large number of pumps that have pressure balancing ports or noise-reducing recesses which are not specifically tailored for deaeration purposes.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a gear pump is provided having a pair of intermeshing gears in a housing. Advantageously, separate bleed port means and charging passage means are defined in the housing. On the one-hand the bleed port means communicates entrained air collected in the fluid at the roots of the gear teeth as a result of centrifugal force away from the inlet and the outlet ports of the pump. And on the other hand the charging passage means communicates fluid under pressure at the outlet port of the pump with the teeth in order to encourage the movement of entrained air radially inwardly or centripetally toward the bleed port means.
More specifically, the gear pump housing of the present invention has defined therein a pair of arcuate bleed slots and a pair of arcuate charging slots which are so constructed and arranged as to achieve a substantial reduction in the amount of entrained air being delivered to the outlet port of the pump. For example, if the fluid intake to the pump would exhibit an entrained air level of about 20% by v
REFERENCES:
patent: 2541010 (1951-02-01), Ungar
patent: 3267862 (1966-08-01), Mosbacher
patent: 3526470 (1970-09-01), Swanson
patent: 4231726 (1980-11-01), Cobb et al.
Cobb Delwin E.
Rodibaugh Scott A.
Caterpillar Tractor Co.
Lanchantin, Jr. Charles E.
Vrablik John J.
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