JP2002544428A - Regenerative pump type machine - Google Patents

Abstract

(57) Abstract: A runner (4) rotatably arranged in a casing (1, 2) is provided for improving the efficiency of a regenerative pump type machine and at the same time reducing assembly labor and manufacturing costs, The runner (4) has a support ring (5) with vanes (6), which support ring (5) is connected to a drive shaft by a hub from a runner axis. , At least one side in the axial direction, and at least in the range of the support ring (5), the gap (3) between the runner (4) and the casing (1, 2) acts to prevent the gap (3) from leaking. We propose a regenerative pump-type machine in which at least one labyrinth profile (7) is provided, which labyrinth profile (7) is machined into the casing (1,2) and / or the support ring (5).

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a regenerative pump type machine.

In German Patent Application DE-A-2 244 933, a regenerative pump type in which a sealing tape is fitted in a circumferential groove provided in the casing and which extends towards the end face of the support ring. Compressors are known. The sealing tape is provided in the circumferential groove so as to form a gap as small as possible between an end of the sealing tape protruding from the circumferential groove and an end face of the support ring. Thereby, the so-called leakage loss is made as small as possible. However, the production of such a leak-proof device has the disadvantage that it is very expensive. It is very difficult to align the sealing tape to obtain a uniform narrow gap. In the circumferential direction of the regenerative pump compressor, a gap remains at the abutting point of the sealing tape, and this gap causes a pressure loss.

[0003] In EP-A-0 708 248 a regenerative pump-type compressor is known which has a radially extending seal ring on the inner peripheral surface of the axial projection of the support ring. The seal ring is fastened and fixed to a mounting surface provided on a casing of the regenerative pump compressor by a holding ring, and a tip of the seal ring is in contact with an axial protrusion of the support ring. In the case of this regenerative pump type compressor, there is a disadvantage in that high manufacturing costs and a large number of parts are required to realize such a leak prevention device.

[0004] It is an object of the present invention to improve a regenerative pump-type machine in such a way that a good clearance-tightening action and consequently a high efficiency can be obtained with low production costs and low assembly costs.

According to the present invention, there is provided, in accordance with the present invention, a runner rotatably disposed in a casing, the runner having a support ring with vanes, the support ring supporting and supporting the support ring. At least one labyrinth profile, which projects from the hub coupling the drive shaft to at least one side in the axial direction with respect to the runner axis and at least in the region of the support ring between the runner and the casing, acts to seal this gap. This is solved by the fact that this labyrinth profile is machined into the casing and / or the support ring.

By arranging such a labyrinth profile in the area of the gap between the casing and the runner according to the invention, a long-term stable high-performance leak-proof device is created. There is the advantage that there is no need to use, fix and assemble auxiliary parts to manufacture such a leak-proof device. Accordingly, assembly time and inventory management costs for such a leak proof device are reduced. During operation of the regenerative pump machine, its components (especially the support ring and the casing) warm up, but experiments have shown that even during operation of the regenerative pump machine, the clogging-leakage effect was hardly affected by temperature. Therefore, especially when the support ring and the casing are made of the same material and have the same coefficient of thermal expansion, the leak-proof device is independent of the operating time of the regenerative pump machine and is stable for a long time during the operation. Guaranteed regenerative pump type mechanical properties. As the operating time increases, the operating point of the regenerative pump machine rarely changes unintentionally, since there is no frictional action between the components forming the leaktight device.

In order to effectively seal the gap, the labyrinth profile continues approximately circumferentially of the regenerative pump machine.

The labyrinth profile preferably has a rectangular cross-section, a trapezoidal shape, and / or a triangular shape. The formation of the labyrinth profile depends, inter alia, on the selected manufacturing method, the medium to be transported, the material of the casing and / or the support ring.

In another advantageous embodiment of the invention, the labyrinth profile has a stepped shape in the housing or the support ring.

The labyrinth profile in the casing and / or the support ring is preferably located in a location that is particularly simple to manufacture, can be implemented with little effort, and provides the best possible leak-proof action.

[0011] The invention and other advantageous embodiments of the invention are described in the dependent claims.

In the following, the invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is a partial sectional view of a twin-flow regenerative pump machine. 2 to 10 are detailed cross-sectional views of the X and Y parts of the leak prevention device of the twin-flow regenerative pump type machine.

The casing of the twin-flow regenerative pump machine in FIG. 1 comprises two casing halves 1,
2 are formed. These casing halves 1, 2 surround the runner 4. The runner 4 is disposed on a drive shaft (not shown). The runner 4 has a support ring 5 on the outer periphery thereof, and the blade 6 of the runner 4 is attached to the support ring 5. The support ring 5 is arranged on a hub (not shown). The hub fits over the drive shaft and is rigidly connected to the drive shaft. A gap 3 is present between the support ring 5 and the two casing halves 1,2. This gap 3 causes a leakage loss, and it is necessary to prevent leakage during operation. Labyrinth packing devices X and Y are provided on both end surfaces of the support ring 5. That is, the portions of the support ring 5 and the casing halves 1, 2 which are located opposite to each other are advantageously labyrinth packing devices X
The labyrinth contour 7 is formed according to Y, and the labyrinth contour 7 extends continuously in the circumferential direction. The labyrinth profile 7 is easily made, in particular by lathing or milling.

2 to 6 show a labyrinth profile 7 having a rectangular cross section.
The labyrinth profile 7 can be triangular or trapezoidal in cross section. The labyrinth contours 7 can be arbitrarily combined. The important thing is gap 3
Is to form an edge that performs a labyrinth packing action in the range of (1). According to the invention, the edge defines a labyrinth profile which is chamfered with a small radius of about 0.5 mm or less, with a very good leak-proof action at the "sharp" edge.

FIGS. 7 and 8 show a labyrinth profile 7 formed in principle in a stepwise cross section. The labyrinth contour is formed by repeatedly arranging the above-mentioned labyrinth contour shape, thereby enhancing the labyrinth packing action.

FIGS. 9 and 10 show the continuous formation of a labyrinth profile used to prevent the gap 3 from leaking, similar to the labyrinth profile described above.

By forming a labyrinth profile 7 on the support ring 5 and / or the casing halves 1, 2, the assembly of such a regenerative pump compressor is greatly simplified.

The embodiment in FIGS. 3 and 5 is suitable when the materials of the casing and the support ring 5 are different. That is, even when the coefficient of thermal expansion of the casing and the support ring 5 are different (especially when the coefficient of thermal expansion of the casing is smaller than that of the support ring), the long running of the regenerative pump type machine because the gap 3 is meandering. During the period, in addition to the labyrinth packing function being fully exerted, no frictional contact between the casing halves 1, 2 and the support ring 5 occurs.

It is not necessary to insert and secure an auxiliary sealing element in the gap 3 during the assembly operation or the inspection operation. Since the materials of the casing halves 1, 2 and the support ring 5 have approximately the same coefficient of thermal expansion, a sufficient leak-proof action occurs during operation of the regenerative pump machine. If the materials of the casing halves 1, 2 and the support ring 5 are the same, the coefficient of thermal expansion is also the same, so that a better leak-proof action occurs.

Thus, a stable operating characteristic of the regenerative pump machine is ensured over a long operating period.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a twin-flow regenerative pump type machine.

FIG. 2 is an enlarged detail view of a different embodiment of section X in FIG. 1;

FIG. 3 is an enlarged detail view of a further different embodiment of the part X in FIG. 1;

FIG. 4 is an enlarged detail view of a further different embodiment of part X of FIG. 1;

FIG. 5 is an enlarged detail view of a different embodiment of the portion Y in FIG. 1;

FIG. 6 is an enlarged detail view of a further different embodiment of the Y section in FIG. 1;

FIG. 7 is an enlarged detail view of a different embodiment of section X in FIG. 1;

FIG. 8 is an enlarged detail view of a further different embodiment of the part X in FIG. 1;

FIG. 9 is an enlarged detail view of a different embodiment of part X in FIG. 1;

FIG. 10 is an enlarged detail view of a further different embodiment of section X in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 half casing 2 half casing 3 gap 4 runner 5 support ring 6 blade 7 labyrinth contour

Claims (6)

[Claims] A runner (4) rotatably arranged in a casing (1, 2).
), The runner (4) having a bladed support ring (5), which supports a support ring (5) and couples it to a drive shaft from a hub;
With respect to the runner axis, at least one side protrudes in the axial direction, and at least the support ring (5
The gap (3) between the runner (4) and the casing (1, 2) in the range (1) is provided with at least one labyrinth profile (7) which acts to prevent the gap (3) from leaking. A regenerative pump machine in which the labyrinth profile (7) is machined into the casing (1,2) and / or the support ring (5). 2. The regenerative pump-type machine according to claim 1, wherein the labyrinth profile extends substantially circumferentially of the regenerative pump-type machine. 3. The regenerative pump machine according to claim 2, wherein the circumferentially extending labyrinth profile extends over at least part of the circumference of the regenerative pump machine. 4. The labyrinth profile (7) has at least one rectangular cross section,
4. The regenerative pump machine according to claim 1, wherein the machine has a trapezoidal shape and / or a triangular shape. 5. The regenerative pump-type machine according to claim 1, wherein the labyrinth profile has a substantially cross-sectional stepped shape. 6. The regenerative pump-type machine according to claim 1, wherein the labyrinth profile is formed at the start and / or end of the gap.