WO2009127281A1

WO2009127281A1 - Vane of a vane pump or a vane compressor

Info

Publication number: WO2009127281A1
Application number: PCT/EP2009/000492
Authority: WO
Inventors: Martin FRÖHLICH; Otto Altmann
Original assignee: FRÖTEK Kunststofftechnik GmbH
Priority date: 2008-04-17
Filing date: 2009-01-27
Publication date: 2009-10-22
Also published as: DE102008019440A1

Abstract

The invention relates to a vane pump or a vane compressor, having at least one vane supported displaceably within a rotor, wherein the rotor is supported eccentrically in a hollow cylinder, the vane end (4) frictionally contacting the inner wall thereof, wherein the vane end forms a curved spring tab partially encompassing a hollow space partially open to a vane side.

Description

23.01.2009 CO / rc 680101WO B

FRÖTEK Kunststofftechnik GmbH

At the Lower Söse 24 - 30

D 37520 Osterode on the Harz

Wing of a vane pump or vane compressor

The invention relates to a vane pump or compressor with at least one displaceably mounted within a rotor wings, wherein the rotor is eccentrically mounted in a hollow cylinder, on the inner wall, the wing end rubbing comes into abutment.

Vane pumps and vane compressors with one or more vanes of various wing arrangements, wing bearings and operating principles have been known for several decades. The wings (one or more) of these vane pumps were previously preferably made of metallic materials. Only in recent years wings for vane pumps and compressors made of polymer materials (thermoplastics and thermosets) have been developed and used. Such wings for vacuum and displacement vane pumps, also with mentioned polymer materials, are known from DE 10 2006 016 241 A1, DE 2006 012 889 D1, DE 10 2004 064 029 A1 and DE 200 18 958 U1. The wing variants, types and designs in full material or with breakthroughs, previously predominantly in metallic versions, are all closed at the wing tip, so that a plant pressure corresponding to the system pressure with sufficient tightness and small contact surface is not achievable.

The object of the invention is to improve a vane-type pump or compressor of the type mentioned above so that the wing tips due to their Elasticity achieve adequate sealing with a small contact surface and low friction.

This object is achieved in that the wing end forms a curved resilient tongue, which partially surrounds a cavity which is open to a wing side.

Such a wing is able to compensate for the wear-abrasion by a self-regulating contact pressure on the working pressure of the pump or the compressor to reduce the leakage rates. The wing is designed as a spring and can be installed with slight preload, whereby the manufacturing tolerances are compensated.

In this case, it is advantageous that the wing is opened on the side facing the conveying medium with a resilient elasticity, e.g. due to polymer material variants, with a relatively small specific weight for highly accelerated blade masses.

The selection of suitable materials leads to the required elastic constants. The technical design of the open wing tip tips geometries, which must have the smallest possible contact forces and surfaces, ensure that, nevertheless, is optimally sealed sufficiently against the working pressure to be pumped. The geometric design and the CAR-FEM pre-analyzes show that a wing of this type meets the requirements very well.

The preferably one-piece wing or multi-part wing for one or more leaf vacuum and displacement pump according to claim 1 has by the choice of materials and the geometric design all the features for a self-contact pressure regulating system with wear compensation and tolerance compensation, over the entire life of such pumps and compressors , The wing has a previously designed opening in the direction of the pumping medium, which presses the winged ends against the outer wall, of the generally circular (other of a circular slightly different embodiments are possible) pump interior via the applied working pressure. The inside of outside tapered wing-ends, viewed over the cross-section, have by a relatively small deformation on a sufficiently high force in order to compensate for the occurring wear over the entire life. The opening at the wing ends may be circular or in the form of an ellipse arranged at a certain angle in order to reduce the cross section of the resilient wing ends and to convert the working pressure into pressing forces against the outer wall. Since the manufacturing tolerances for such a device are extremely small, this type of wing design in the longitudinal direction also ensures that no mechanical reworking such as grinding, lapping or polishing are required, as with the other surfaces of such components. Since the wing acts as an elastic spring at the ends by this type of embodiment described here, the wing can also be installed with a small oversize. Both measures save manufacturing and later user costs and increase the function of lifetime performance, without leakage rate losses.

Additional measures to reduce friction and wear are fillers in polymeric materials such as carbon fibers, molybdenum disulfide (MoS2), polyerafluoroethylene (PTFE, better known by the brand name Teflon) and others.

According to the invention, in this type of friction and closure reduction, either e.g. Nanocrystals directly initu incorporated into the entire wing material or the wing-end surfaces are provided with metallic or ceramic or glass-ceramic thin layers, which alone or with special primers are sufficiently elastic to ensure the required deformations. The elongation at break or the elongation at break of this thin-film surface materials is adapted to the material of the wing body, which represents a significant differentiation feature to the previously known embodiments.

Such wings are preferably made of polymer materials which have corresponding elastic constants in the linear elastic range even under low and high temperature influence eg in hot oil. The wing material will ever selected according to the application so as to ensure the function of the required elastic deformation at the blade ends.

Further advantageous embodiments are listed in the subclaims.

An advantageous embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it

Figure 1 is a schematic representation of a vane pump or a

-Compressors in section;

Figure 2 is a perspective view of the wing;

3 shows a detail of the sectional view in the region of the wing end;

4 shows an outer end of the wing.

The vane pump or the vane compressor has a hollow cylinder 1 as a stator, in which a cylinder rotates as a rotor 2. The axis of rotation of the rotor 2 is arranged eccentrically to the stator, wherein a position of the outer wall of the rotor contacts the inner wall 9 of the stator.

In the rotor 2, at least one one-piece wing 3 is mounted diametrically, rubbing its two ends as heads 4 along the inner wall 9 of the stator 1. In this case, each head 4 forms a laterally open cavity 5 by a projecting tongue 6, which is integrally formed with its foot 7 on a side surface 8 of the wing 3 and extends arcuately away from the wing to the hollow cylinder inner wall 9 back and with its curved outer surface 10 at the wall 9 rests. Here, the cavity 5 is open to the pressure side of the pump chamber.

The invention thus relates to a vane-vacuum or displacer micro and macro-pump or compressor having self-working pressure-pressure-controlled internal rotor configurations. The open at both ends of the wings is preferably made in one piece, but can also be multi-piece by a special wing tip is molded directly or complained. The liquid gaseous or solid conveying medium itself pushes the wing tip over an appropriate selection of materials and construction to the outside and thus compensates for the occlusion occurring and tolerances. The contact pressure of the blade edges on the preferably circular inner wall 9 is essentially determined by the working pressure of the pump (media delivery) or the compressor (vacuum). The wing design with an open end at the wing tips ensures low leak rates and consistently high performance of the pumps and compressors throughout their lifetime.

As a result of this configuration according to the invention and design of the wing tips 6 with the open design at the end of the wing, the applied working pressure presses the wing edge against the pump or compressor wall 9 and thus compensates for the wear that occurs between 0.05 mm and 0 over the running time , 3mm in relation to the wing length. If abrasion and wear cause wear of only a few 0.001 mm up to a maximum of 0.5 mm, which is the case in experience, this construction ensures a constant high pumping or negative pressure performance over the entire life-span period, since the abrasion is compensated by the contact forces on the bearing line (line) at the inflection point of the wing-end radii.

The occurring wear is compensated by the elastic deformation of the adjacent wing ends permanently without further aids or components over the entire life.

As wing materials, all known materials are in question, which are on the mechanical design parameters in a position to ensure by their elongation and deformation properties in the linear-elastic range (important for Ralaxation without permanent damage). Preferably, however, polymer materials are used but it is also metals, glass - and glass-ceramic materials and others usable. The wing material itself may be provided with in-situ nanocrystals or other friction and seal reducing fillers such as MoS2, PTFE ₁ carbon or aramid (aromatic polyamide) fibers throughout the wing structure, or even at both wing tips.

The production of such wing structures is possible in almost all known and technically introduced methods. For the preferred polymer materials, methods such as injection molding or extrusion are suitable, since the cross-section in the longitudinal direction can also be constant. Casting and forming processes are also conceivable.

Special surface coating methods on the adjacent wing tips or on the moving side surfaces, which reduce the friction and wear, can be treated with nano-crystals, plasma surface coating or otherwise applied metal thin films.

This type of vane design also has advantages in eventual return problems of the pump or compressor. The open end edge acts like a spring. These spring properties of the wing end edges also compensate for any tolerance manufacturing problems that may occur. In addition, the wing can be installed with a slight oversize, whereby the wing contour adapts to the outer wall of the circular pump or compressor wall.

The wing with the end edges open on both sides is made in this construction of a material (polymer materials, metals or other materials), which has a sufficiently high elongation (deformation) in the linear elastic region as possible, so that the working pressure of the pump on the conveyor media in is able to press the end edges against the wall. The weight of the wing is reduced by regularly arranged in the wing hollow chambers 11 preferably the same size. This construction presented here according to the invention reduces the material consumption and through the system of "equal wall thicknesses" the stresses in the wing component.

A recycling of the wings is possible because the wing is preferably made of a material.

Claims

claims

1. vane pump or compressor with at least one within a rotor (2) slidably mounted wings (3), wherein the rotor is eccentrically mounted in a hollow cylinder (1), on whose inner wall, the wing tip (4) rubbing comes to rest, dad u The blade end (4) forms a curved resilient tongue (6) which at least partially surrounds a cavity (5) which is open towards a wing side (8).

2. vane pump or compressor according to claim 1, dad urch geken nzeich net that the tongue (6) rests with its curved outer side on the inner wall (9) of the hollow cylinder (1).

3. vane pump or compressor according to claim 1 or 2, dad u rch geken net nets that the wing (3) at its two ends (4) each have a curved resilient tongue (6), each of the laterally open cavity (5 ) surrounds.

4. vane pump or compressor according to one of the preceding claims, d ad u rch geken net nzeich that the cavity (5) opens to the pressure side of the pump or compressor chamber out.

5. vane pump or compressor according to one of the preceding claims, d ad u rch geken net nzeich that the wing (3) with its resilient tongue (6) consists of a particular polymeric plastic.

6. vane pump or compressor according to claim 5, characterized Porsche Style nzeich that the plastic contains fillers, which reduce the friction and / or the closure.

7. vane pump or compressor according to one of the preceding claims, dad u rch gekennzeich net, that the wing (3) or at least the tongue (6) is provided on the outside with a friction and / or wear-reducing coating.

8. vane pump or compressor according to one of the preceding claims, dad u rch geken nzeich net that the wing (3) has hollow chambers (11).

9. Vane pump or compressor according to one of the preceding claims, dad u rch geken nze I net, that the wing (3) extends integrally across the rotor (2).