Rotary expansible chamber devices – Moving cylinder – Rotating
Reexamination Certificate
2001-03-20
2003-02-18
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Moving cylinder
Rotating
C418S039000
Reexamination Certificate
active
06520757
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a housing construction for receiving or accommodating and supporting a micro pump conveying for example a fluid, the micro pump working according to the principle described in WO-A 97/12147; as far as the operation method of this type of pump or of a corresponding type of a fluidic motor is concerned, reference is explicitly made to this document, particularly to page 1 (paragraph 2), page 5 (paragraph 4) and page 6 (last paragraph) as well as page 7 (first paragraph). An inner wheel and an outer wheel are designed and arranged to be in a meshing engagement with each other, both, the inner wheel and said outer wheel being rotatably arranged in a sleeve, compare
FIGS. 1
,
1
a
,
2
and
2
a
, as well as
FIGS. 3
a
,
3
b
and
3
c
of this document. The inner wheel is coupled with a shaft (50) to be stiff against torsion. An axis of the outer wheel and of the sleeve is offset relative to an axis of the shaft, so that the inner wheel with its outward oriented teeth rolls on an inward oriented, smooth, particularly cycloid tooth structure of the outer wheel, and axial sealing lines are provided depending on the number of teeth, respective pairs of said sealing lines defining a conveying chamber. In a pump arrangement, the conveying chambers enlarge in a direction of rotation on a suction side, take up a fluid and convey it to a delivery side over an imagined center plane extending through an axis, on which delivery side the conveying chamber, which just passed over, continuously decreases in the course of a continued rotation until it is practically zero, and returned to the suction side on an opposite side of the center plane. On the suction side, the pump chamber starts to open again continuously with the rotary movement, so that the cycle is concluded. The movement described for one conveying chamber is simultaneously valid for all existing conveying chambers which at an instant have a different volume between a respective pair if sealing lines, so that, upon operating the pump, a fluid current of a maximum uniformity together with a high ability of miniaturization of the entire micro system construction is achieved.
A high miniaturization requires that fluidic micro systems, which are e. g. designed as pumps, are correspondingly supported or arranged. Thus, in the described prior art according to WO-A 97/12147, a sleeve is selected as a bearing, in which sleeve parts (41, 42) are inserted on both face ends of the inner wheel and the outer wheel, the parts serving for supporting the shaft and for determining an inlet kidney and an outlet kidney (specifically described in
FIG. 8
of the document with reference to an inlet kidney 41k and an outlet kidney 42k). The inlet kidney is offset (reflected) at an angle of 180° relative to the outlet kidney, but on two opposite ends, so that an axial fluid current is obtained from the inlet kidney to the outlet kidney over the conveying chambers continuously changing in volume according to the above mentioned description. However, such a pump may also operate with a U-shaped fluid current, the inlet kidney and the outlet kidney in this case being arranged at the same face end of the pump, only offset to be mirror-inverted at an angle of 180° relative to each other (reflected at a center plane extending through an axis). Such a micro system can be inserted or insertable in a housing construction such that it is safely and exactly supported, but that simultaneously all connections are provided for permitting a fluid inlet, a fluid outlet and a coupling of a mechanical driving source for rotating a pump shaft (of an inner wheel pump or an outer wheel pump) or an output or delivery drive shaft (of a fluidic motor) or a measurement technical aspect (of a fluidic sensor) for the flow of a volume.
A suitable housing shape for accommodating such a micro pump is described in a data sheet “Pumpenkopf mzr®-4600” by Hydraulik Nord Parchim Mikrosysteme GmbH. The pump head described in this document is provided with a shaft protruding at a face end four coupling a motor. This housing construction comprises five disc-shaped elements adapted as cylindrical elements, starting with a housing-shaft sealing, a compensating kidney plate and a rotor support plate, followed by a fluid guiding means and a terminal end cover. The rotor support has a thickness (or height or size extending in an axial direction) corresponding to an axial dimension of the outer wheel and the inner wheel according to the above mentioned description. The support plate is provided with an opening offset relative to the shaft axis for eccentrically driving the inner wheel, so that the outer wheel of the toothed ring micro pump is supported eccentrically in the opening of the plate and realizes the above described operating method of conveying chambers continuously increasing in volume and on an opposite side continuously decreasing in volume—when the shaft is driven by a rotating drive. On both sides of the outer wheel and the inner wheel, thus in a direct contact with the wheels at a face end respectively, the compensating kidney plate and the fluid guiding plate are arranged, the plates comprising the above described inlet kidney and outlet kidney on a fluid supplying side and oriented towards the rotor, and compensating kidneys arranged to be reflected symmetrically with respect thereto for providing a hydraulic balance on an opposite side. Thus, a U-shaped fluid current is obtained extending from an inlet over the inlet kidney to the rotating pump chambers, towards an outlet and back to a radially oriented outlet as shown in the data sheet mzr®-4600.
DE-B 33 10 593 (White) shows a housing construction for a pump arrangement (
FIG. 1
, reference numeral 22) according to which an eccentrically operating gerotor together with an eccentrically operating wobble rod is realized. At an end through which the shaft does not pass, a central outlet and an inlet radially offset with respect to the outlet are provided, a number of intermediate plates provided with channel segments being arranged between the inlet and the outlet (compare
FIGS. 2
,
3
,
4
and
5
of the document). DE-A 24 08 824 (McDermott, compare
FIG. 4
) works with only three plate shaped elements; the last mentioned illustration shows the gerotor principle in connection with a compensation of wear aspects of teeth being in a meshing engagement, whereby channel segments are provided in a directly adjacent portion between an inner plate and two outer support plates for the shaft. CH-A 661 323 (Weber) also relates to channel segments in a housing construction comprising a number of plates, the document in a modular construction manner assembling a toothed wheel pump from a number of components easy to combine, to replace and to supplement, but actually describing a housing for accommodating such a pump.
OBJECT OF THE INVENTION
It is an object of the invention to improve a housing construction such that the flexibility of the housing construction is increased and that it is not necessary to separately manufacture each of the described plate-shaped elements for each individual application.
SUMMARY OF THE INVENTION
According to the invention the object is achieved by arranging at least one and preferably two or more plate-shaped layered structure elements between a support plate for receiving or accommodating an outer element of a micro system and a connecting block for mounting inlet and outlet means, with which elements a fluid conveyance or transport in the layered structure elements, i. e. from an inlet to the micro system in the support plate (inlet channel) and back to an outlet (outlet channel), is improved and made more flexible.
At least one further plate-shaped layered structure element comprises one, two or more channel segments oriented either substantially radially, circumferentially or axially. Only axially oriented channel segments may be provided, but also only substantially radially oriented segments may be provided, as well as a combination of both channe
Erdmann Sven
Voegele Gerald
Weisener Thomas
Dubno Herbert
HNP Mikrosysteme GmbH
Vrablik John J.
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