Claims
- 1. A pump for generating pressure or negative pressure, comprising a pump chamber (32) which has a high-pressure port and a low-pressure port; two rotors (28, 30) having at least two blades and fitted to two parallel shafts (20, 22) in the pump chamber (32) that are offset to each other, the shafts (20, 22) defining an axial direction; a drive (10) arranged on an end face of the rotors (28, 30) and a housing cover (34) arranged on the opposite side, the housing cover (34) being configured cup-shaped and the high-pressure port as well as the low-pressure port being integrated in the housing cover (34), wherein the inner wall (44) of the housing cover (34) delimits the pump chamber (32) on an end face and has two axial openings (46, 48) for the high-pressure port and the low-pressure port and the axial openings (46, 48) are each adjoined by one channel (40, 42) which is integrated in the body of the housing cover (34), at least one of the channels (40, 42) leading to the circumference of the housing cover (34) and opening out there, the axial opening (48) for the high-pressure port, in operation of the pump, being covered by one of the rotors (28, 30) for a time to enable inner compression of the delivered medium.
- 2. The pump according to claim 1, wherein the axial opening (48) for the high-pressure port is significantly smaller than the axial opening (46) for the low-pressure port.
- 3. The pump according to claim 1, wherein the axial openings (46, 48) are positioned in the central area of said pump chamber (32).
- 4. The pump according to claim 1, wherein the channel (40, 42) has a first channel section extending in parallelism to the inner wall (44) of the housing cover (34), adjoining thereto a channel section which is inclined obliquely in the direction away from the inner wall (44) and inclined outwardly, and adjoining thereto a channel section which opens out at the circumference of the housing cover (34) and is parallel to the inner wall (44) thereof.
- 5. The pump according to claim 1, wherein the blade geometry of the rotors (28, 30) is designed for inner compression.
- 6. The pump according to claim 1, wherein at least a substantial part of the circumferential wall of the pump chamber (32) is formed by the envelope of the housing cover (34).
- 7. The pump according to claim 1, wherein two connection flanges (50, 52) are formed on the circumference of the housing cover (34) at two sides facing away from each other.
- 8. The pump according to claim 7, wherein the connection flanges (50, 52) are vertically offset to each other.
- 9. The pump according to claim 1, wherein the shafts (20, 22) are supported on one side, which is the side that faces the drive (10).
- 10. The pump according to claim 9, wherein the shafts (20, 22) are each supported on both sides of a toothed wheel (24, 26).
Priority Claims (1)
Number |
Date |
Country |
Kind |
299 05 249 U |
Mar 1999 |
DE |
|
Parent Case Info
This is a Continuation-In-Part of application Ser. No. 09/936,937 filed Mar. 18, 2002, abandoned, which is the National Stage of PCT/EP00/02536, filed Mar. 22, 1999.
US Referenced Citations (7)
Foreign Referenced Citations (7)
Number |
Date |
Country |
140405 |
Dec 1949 |
AU |
84 27 615 |
Jan 1985 |
DE |
196 13 659 |
Nov 1996 |
DE |
0 048 095 |
Aug 1981 |
EP |
0 389 838 |
Mar 1990 |
EP |
2 101 687 |
Jul 1981 |
GB |
2139287 |
Apr 1984 |
GB |
Non-Patent Literature Citations (2)
Entry |
German Office Action dated Dec. 28, 1999 (ihr Zeichen: R 1524 DE). |
PCT/ISA/210—International Search Report (R 1524 WO). |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/936937 |
|
US |
Child |
10/305352 |
|
US |