AU3963500A

AU3963500A - Pump for generating pressure or negative pressure

Info

Publication number: AU3963500A
Application number: AU39635/00A
Authority: AU
Inventors: Fritz-Martin Scholz
Original assignee: Werner Rietschle GmbH and Co KG
Current assignee: Werner Rietschle GmbH and Co KG
Priority date: 1999-03-22
Filing date: 2000-03-22
Publication date: 2000-10-09
Anticipated expiration: 2020-03-22
Also published as: KR20020019892A; DE29905249U1; EP1163450B1; WO2000057062B1; JP2002540346A; CN1324239C; AU762304B2; DE50005415D1; KR100681804B1; CN1365432A; HK1048844A1; EP1163450A1; WO2000057062A1; ATE260412T1

Abstract

The invention relates to a pump for generating pressure or negative pressure, comprising a chamber having a high pressure branch and a low pressure branch. Two multi-bladed rotors (28, 30) are mounted on two shafts (20, 22) that are staggered relative to one another in the pump chamber (32). A drive mechanism is minted on the front face of the rotors and a housing lid is placed on the opposite side of said rotors. The housing lid (34) is pot-shaped. Both the high pressure branch (42) and the low pressure branch (40) are integrated into the housing lid (34).

Description

PCT/EPOO/02536 Rietschle GmbH + Co. Pump for Generating Pressure or Negative Pressure The invention relates to a pump for generating pressure or negative pressure, comprising a pump chamber which has a high-pressure port and a low-pressure 5 port, two rotors having at least two blades and fitted to two parallel shafts in the pump chamber that are offset to each other, a drive arranged on an end face of the rotors, and a housing cover arranged on the opposite side. With pumps of this type, the blades of the rotors engage each other without having any contact, so that a lubricate-free operation is made possible. Hence, 10 there are manifold fields of application for such pumps. Due to the manifold application possibilities of theses pumps, an optimization with respect to the size, the weight and the production costs is aimed at. With the known pumps of this type of construction, the rotors are supported on both sides, i.e. on each of the two axle ends. The pump chamber is limited on both 15 end faces by a housing cover. The suction and pressure channels are arranged in one of the two housing covers or in both covers. With the present invention it is aimed at to simplify the structure of the pump, so that the expenditure on manufacture and mounting is reduced. According to the invention, the housing cover is configured cup-shaped; the high-pressure port as 20 well as the low-pressure port are integrated in the housing cover. One single component, namely the housing cover, has three functions: the limitation of the pump chamber on the end face side, the circumferential wall of the pump chamber and accommodating the connection channels. The housing cover can be produced as a cast or shaped part in an economical way.

-2 In a particularly advantageous further development of the invention, the rotors are supported on one side, which is the side that faces the drive. Due to the two bearings being dispensed with on the side of the housing cover, the structure of the pump is further simplified, whereby additional savings on material, weight 5 and mounting expenditure are made possible. Further, space is saved in the region of the free ends of the axles, which can be used for arranging the channels in the housing cover. Thus, it is possible to optimize the geometry of the channels integrated in the housing cover with respect to the conditions in terms of connection and flow. 10 Further features and advantages will be apparent from the following description of an advantageous embodiment and the drawing to which reference is mad and in which: Fig. 1 shows a side view of a pump assembly which is illustrated axially sectioned in the region of the pump section; 15 Fig. 2 shows a side view of a housing cover; Fig. 3 shows a plan view of the housing cover; Fig. 4 shows a further side view of the housing cover; Fig. 5 shows a plan view of the inner side of the housing cover; and Fig. 6 shows a section along line VI-VI in Fig. 5. 20 The pump assembly shown in Fig. 1 has a drive in the form of an electric motor 10. The latter is flange-mounted to the side of a fan hood 12. By means of a clutch 14, the electric motor 10 is connected with a fan wheel 16 within the fan hood 12. The fan hood 12 is put on a gear box 18. Two shafts 20, 22 that are parallel and offset to each other are supported on each of their ends in the gear 25 box 18. The shaft 20 is arranged so as to be aligned with the axis of the electric motor 10 and is directly driven by it. A first spur-toothed wheel 20 is mounted on -3 the shaft 20, this first wheel being in meshing engagement with a second spur toothed wheel 26 mounted on shaft 22. On that ends of the shafts 20, 22 which are non-supported and facing away from the gear box 18, there is provided one two-blade rotor 28, 30 each. The 5 blades of the rotors 28, 30 are claw-shaped and the geometry of which is designed for inner compression. The shafts 20, 22 in the gear box 18 run on ball bearings on both sides of the toothed wheels 24, 26, in particular on double-row angular ball bearings, as can be seen from Fig. 1. Thereby, the shafts 20, 22 get a firm guidance and support with respect to the cantilevered mount of the rotors. 10 The gear box 18 forms with its face facing the rotors 28, 30 a limiting wall on the end face of a pump chamber 32, which for the rest is limited by a cup-shaped housing cover 34 put on the gear box 18. With its flat inner wall, the housing cover 34 limits the pump chamber 32 on the side facing away from the gear box 18 and forms the circumferential wall of the pump chamber 32 by means of its 15 envelope. Integrated in the housing cover 34 are channels forming the high-pressure port and the low-pressure port of the pump. The design of these channels and connections is apparent from Figs. 2 to 6. As can be seen in particular from Figs. 2 to 6, bulges 36, 38 are formed in the 20 end face of the housing cover 34, through which are realized outer limiting walls of two channels 40, 42 integrated in the housing cover. Two openings 46, 48 are formed in the flat inner wall 44 of the housing cover 34. The channel 40 starts from opening 46. This channel has a first channel section which extends in parallelism to the inner wall 44, adjoining thereto a channel section which is 25 inclined obliquely in the direction away from the inner wall and inclined outwardly, as well as a channel section adjoining thereto which extends outwardly and in parallelism to the inner wall 44, and opens out at the circumference of the housing cover 34 into a connection flange 50. The opening 48 is adjoined by channel 42 which likewise has a first channel section which extends in parallelism -4 to the inner wall 44, a channel section adjoining thereto which is inclined obliquely outwardly towards the drive side, as well as a channel section again extending in parallelism to the inner wall 44, and opening out at the circumference of the housing cover 34 into a connection flange 52. The connection flanges 50, 5 52 are situated on sides of the housing cover facing away from each other and are at different levels. Due to the cantilevered support of the rotors 28, 30 there remains available, in the region of the free ends of the shafts 22, 24, a space for an optimum design of the channels 40, 42. The channels 40, 42 can be designed in particular with 10 respect to optimum flow conditions and favorable connection conditions.

Claims

1. A pump for generating pressure or negative pressure, comprising a pump chamber which has a high-pressure port and a low-pressure port, two rotors (28, 5 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, a drive arranged on an end face of the rotors, and a housing cover arranged on the opposite side, characterized in that the housing cover (34) is configured cup-shaped and the high-pressure port (42) as well as the low-pressure port (40) are integrated in the housing cover (34). 10 2. The pump according to claim 1, characterized in that at least a substantial part of the circumferential wall of the pump chamber (32) is formed by the envelope of the housing cover (34).

3. The pump according to claim 1 or 2, characterized in that the shafts (20, 22) are supported on one side, which is the side that faces the drive (10). 15 4. The pump according to any of the preceding claims, characterized in that the inner wall of the housing cover (34) delimits the pump chamber (32) on an end face and has two openings (46, 48) for the high-pressure and the low-pressure port.

5. The pump according to claim 4, characterized in that the openings (46 48) 20 are each adjoined by one channel (40, 42) which is integrated in the body of the housing cover (34).

6. The pump according to claim 4, characterized in that at least one of the channels (40, 42) leads to the circumference of the housing cover (34) and opens out there. 25 7. the pump according to claim 6, characterized in that the channel (40, 42) has a first channel section extending in parallelism to the inner wall (44) of the housing cover, adjoining thereto a channel section which is inclined obliquely in -6 the direction away from the inner wall 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 thereof.

8. The pump according to any of the preceding claims, characterized in that 5 two connection flanges (50, 52) are formed on the circumference of the housing cover (34) at two sides facing away from each other.

9. The pump according to claim 8, characterized in that the connection flanges (50, 52) are vertically offset to each other.

10. The pump according to any of the preceding claims, characterized in that 10 the blade geometry of the rotors (28, 30) is designed for inner compression.

11. The pump according to any of the claims 3 to 10, characterized in that the shafts (20, 22) are each supported on both sides of a toothed wheel (24, 26).