JPS5851288A - Eccentric pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an eccentric pump having a rotor, in which the distance of the circumferential wall surface of the rotor to the casing hole wall of the casing portion varies from top dead center to top dead center according to the eccentricity of the rotor when the rotor rotates. and bottom dead center.

In the eccentric pump of the above type known from German Patent No. 877 052, it is necessary to precisely adjust the gap between the rotor peripheral wall surface and the casing hole i at the bottom dead center (UT) of the eccentric. is difficult.

On the one hand, this gap must not be too wide in order to reduce transport losses, and on the other hand, the rotor must not touch the casing bore wall in order to prevent collision noise and high wear. Particularly in vacuum pumps, a gap as narrow as possible is required in order to keep the efficiency and the resulting negative pressure as high as possible.

Therefore, sophisticated manufacturing measures must be used in known pumps to maintain appropriate tolerances. Therefore, its manufacture is complicated and expensive.

In contrast to the above-mentioned prior art, which forms the starting point for the present invention, the casing part is radially adjusted and can be connected to a bearing part receiving the drive shaft for the rotor, and also to the casing bore wall and the rotor jacket wall. A gap forming member is removable at the bottom dead center position between the surface and the casing part is fixed to the bearing part, thereby fixing the gap at the bottom dead center position, and then the gap forming member is removed. An advantage of the eccentric pump according to the invention is that the gap between the rotor peripheral wall surface and the casing bore wall can be adjusted very accurately without the need for special manufacturing precision. That's true.

It is also advantageous that significantly higher efficiencies can be obtained. Furthermore, the eccentric pump in question has a particularly compact housing construction, which facilitates the installation of the pump in any drive unit. Further advantageous embodiments of the invention are defined in claims 2 to 5.

The invention will now be explained with reference to the illustrated embodiment.

A ball bearing 3 and a seal ring are provided on the driven side of the generator casing 1 of the generator 2 (not detailed), and a generator shaft 5 as a drive shaft penetrates outward through these. ing.

As a result, the generator casing 1 is formed as a bearing part.

On the wedge-shaped toothing 7 formed on the outer end 6 of the generator shaft 5, a rotor 8 with a corresponding notch is fitted in a non-rotatable manner. The pot-shaped casing part 10 of the casing 9 receiving the rotor 8 is arranged eccentrically with respect to the rotor 8 with its casing bore wall 11 (see FIG. 2). A reference numeral 81 is attached to the peripheral wall surface of the rotor 8.

A plurality of through holes 12 are formed in the casing part 10 for a plurality of, preferably three, retainers 13 which are screwed onto the generator casing 1 . Only one of the retainer bolts 13 is shown in the drawing. Each of the retainer bolts 13 has a certain amount of radial play with respect to its own through hole 12, which play will be explained later. Each of the flat heads 14 of the retainer bolts 13 is embedded in a cover 15 of the casing part 10.

Each head 14 carries a threaded pin 16 for screwing a nut 17 thereon. This nut 1
7, a housing cup ζ-18 is fastened to the housing part 10, which closes off the pump working cavity 19 formed in the housing 9 from the outside.

The outer edges of the four plates 723 attached to the rotor 8 run along the casing hole wall 11 when the rotor 8 rotates,
In this case, a plurality of chambers of varying size are formed, which chambers are connected one after another to the suction opening 24 or to the discharge part 25. This creates a negative pressure in the suction opening 24, which is used, for example, to operate a vacuum braking force amplifier. Cram school-723
In order to reduce the pressure in each chamber 23' located below, the chamber 23' is
' are connected to each other via end-side annular grooves 20, 21 in the rotor 8.

When assembling the pump, the housing part 10 is first loosely screwed onto the generator housing 1 by means of the buckles 13. The rotor 8 is then inserted onto the wedge-shaped toothing 7 of the generator shaft 5. Next, a sheet 26 is inserted between the peripheral wall surface 8' of the rotor 8 and the casing hole wall 11 within the range of the bottom dead center UT, and the thickness of this sheet 26 is adjusted to correspond to the desired play at the relevant location. It is being Furthermore, the rotor 8 is pushed in the direction of the bottom dead center UT (upwards in the drawing), so that the radial play of the wedge-shaped teeth 7 is also taken into account. In this case, the rotor 8 is displaced parallel to the generator axis 5 to the extent of the error associated with the connection in question. On the other hand, the casing portion 10 has the rotor peripheral wall surface 8
′ is pushed toward . backup port) 13 and through hole 1
2 must be of a size that does not interfere with the adjustment work described above.

At the mutual positions of the members set as described above, the retainer belt 13 is firmly tightened. The sheet 26 is then removed and the casing forceps 18 are fitted and screwed tightly with nuts], 7.

In this way, the gap at the bottom dead center, ie the gap required at that location, can be set accurately. Due to the resulting good efficiency, the pump in question can be manufactured smaller than in other known designs. Furthermore, since no centering diameter portion is required, the pump is easy to manufacture, and furthermore, the construction of the individual parts is simple.

The invention is not only applicable to vane pumps, but can be advantageously used in any eccentric pump, such as for example rolling piston pumps or others, to keep the gap at its bottom dead center as small as possible.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view of a pump according to the present invention, and FIG. 2 is a cross-sectional view of the pump according to the present invention.
■It is a sectional view taken along the line. ■... Generator casing, 2... Generator, 3...
Zeel bearing, 4... Seal ring, 5... Generator shaft, 6... Outer end, 7... Wedge-shaped tooth portion, 8...
Rotor, 8'...Surrounding wall surface, 9...Rotor casing, 10...Casing portion, 11...Casing hole wall, 12...Through hole, ■3...Retainer bolt, 1
4...Head, 15...Housing portion, 16...Threaded bottle, 17...Nut, 18...Casing cut-1199, Pump working chamber, 20, 21... Annular Groove, 23... Vane, 23'... Chamber, 24... Suction opening, 25... Discharge part, 26... Seat, UT・
・Bottom dead center agent Toshio Yano, patent attorney

Claims (1)

[Scope of Claims] An eccentric pump having a 1,0-rotor, wherein the distance of the circumferential wall surface of the rotor to the casing hole wall of the casing portion is adjusted to the top dead center according to the eccentricity of the rotor when the rotor rotates. (OT) and bottom dead center (UT), the casing portion (10)
is adjusted radially so that the drive shaft (
5), and a gap forming member (26) is connected to the bottom dead center position between the casing hole wall (11) and the rotor peripheral wall surface (8'). It is possible, and the casing part (1o) is attached to the bearing part (1).
An eccentric pump, characterized in that the gap forming member can be removed after the gap at the bottom dead center position has been fixed, thereby forming a gap at the bottom dead center position. 2. A wedge-shaped toothed portion is provided between the drive shaft (5) and the rotor, and the radial play between the drive shaft (5) and the rotor (8) causes the rotor (8) to move toward the bottom dead center. 2. Eccentric pump according to claim 1, characterized in that it is included as an element in the fixed formation of said gap by applying pressure to said gap. 3. The retainer screwed into the bearing part (1) (1)
3), the casing part (10) becomes the bearing part (1)
and the through hole (12) provided in the casing part (10) for the buckle bolt (13) has a suitable radial play with respect to the buckle bolt (13); An eccentric pump according to claim 1. The retainer (13) for fixing the casing part (10) to the bearing part (1) is attached to the casing part (10).
) flat head (14) that can be buried in the shell (15)
) The eccentric pump according to claim 3, wherein the eccentric pump has: 5. Hera r (14) each has one nut (17)
It holds a threaded pin (16) for screwing the pump working chamber (19) by means of said nut (17).
5. Eccentric pump according to claim 4, characterized in that the casing bores (18), which close the casing to the outside, are fixed to the casing part (10).