JPS5828402B2 - rotary vane machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary vane machine particularly suitable for operation at high speeds with a dry, oil-free compressible working medium, such as compressed air.

A considerable amount of experimentation has been conducted over several decades to discover how vane machines should be designed to operate without oil lubricants for substantial periods of time.

However, no solution has been found that has a lifespan directly comparable to that of oil-lubricated machines.

U.S. Pat. No. 3,335,944 proposes using a vane material consisting of a mixture of polytetrafluoroethylene and ground glass.

The main object of the invention is to provide a rotary vane machine with vanes that are sufficiently hard to be wear resistant without breaking off so that pieces separate from the vane during operation of the machine.

At the same time, the blades should be light and stiff for hand-held grinding machines and capable of operating at high speeds, for example about 2 Q m/1 sec and higher.

According to the invention, the radially movable vanes have at least two reinforced layers spaced from each other and a further layer between these layers, the further layer being at least A rotary vane machine is provided having an inorganic solid lubricant on a surface in sealing contact with the cylinder.

Some embodiments of the invention will now be described with reference to the accompanying drawings.

The vane motor shown in FIGS. 1 and 2 has a cylinder housing 11
This cylinder housing 11 has two end plates 13.
It is equipped with

A rotor 16 with an outwardly projecting shaft 12 is journal-mounted eccentrically relative to the cylinder housing 11 in the end plate 13 by means of a bearing 14 .

This rotor 16 furthermore comprises a number of vanes 20 which can move in substantially radial slots 19 .

In this connection, what is meant by radial is that the stand 19 can be offset by an angle of up to 30° from the radial direction.

The cylinder housing 11 has a compressed air inlet 30 and an outlet 3
1.

The vane shown in FIG. 3 has two layers 31', 34 reinforced with a woven glass fiber mat 35.

These layers, spaced apart to increase the stiffness of the blade, are obtained by impregnating a glass fiber mat with PTFE.

The vane has a further layer or core 33, which consists of an inorganic solid lubricant, preferably lead or lead oxide.

Furthermore, this core has glass as a hard phase, which can be a powder or fiber fragments, in order to improve the wear resistance of the blades.

The core 33 further includes a matrix of PTFE in which a hard phase and an inorganic solid lubricant are embedded.

The motor is pressed against the rotor during operation.

The layer 34, which is pressed against the rotor during operation of the motor, contains graphite to reduce friction between the blades and the rotor.

The two reinforced layers 31,34 are joined to the core 33 via two thin foils 32 of fluorinated ethylene propylene polymer or polyfluoroalkoxy polymer.

During operation, surface 91 is in contact with cylinder housing 11.

In the embodiment shown in FIG. 4, the core or further layer 40 is reduced so that it only occupies a small area near the surface in sliding contact with the cylinder housing 11.

This vane has a number of reinforced layers 36, 38, layer 38
contains graphite.

These layers are covered with reinforcing mat 3 as in the previous embodiment.
9 and are joined together by a thin foil 37 of fluorinated ethylene propylene polymer.

The core 40 is bonded primarily to the outermost reinforced layer, but also to some extent to the layer filling the space behind the core.

During operation, surface 92 contacts cylinder housing 11 .

The embodiment shown in FIG. 5 has multiple reinforced layers 41, each comprising a web of woven glass fibers impregnated with PTFE.

These layers are joined together by a thin foil 42 of fluorinated ethylene propylene polymer.

An inorganic solid lubricant, preferably lead or lead oxide, is introduced into this thin foil 42 in the form of a dusting.

These thin foils are made by covering large sheets of fluorinated ethylene propylene polymer liberally with lead or lead oxide powder and heating it from below.

The thin foil thus softens and bonds to the particles that come into contact with the foil.

The corrugated foil is cooled and excess powder is removed. By varying the foil thickness or particle size, different concentrations of inorganic solid lubricants can be obtained.

Instead of covering the entire foil 42 with lead or lead oxide powder, it is also possible to cover only that portion near the surface that makes sliding contact with the cylinder housing.

In this case, a vane is obtained which has a further layer 42 with regions 44 containing an inorganic solid lubricant.

Although such blades are relatively light, they are complex to manufacture.

During operation, surface 93 is in contact with cylinder housing 11 .

The embodiment shown in FIG. 6 has multiple layers 45, which are reinforced with a woven glass fiber web 46.

In this case, these layers contain a mixture of PTFE and an inorganic solid lubricant, such as lead or lead oxide.

Layers 45 are bonded directly to each other. Alternatively, layer 45 may include a mixture of phenolic resin and inorganic solid lubricant.

In that case, reinforcing web 46 may consist of woven cotton.

During operation, surface 94 contacts cylinder housing 11 .

FIG. 7 schematically depicts one method of manufacturing a reinforced layer according to any of the embodiments described above.

Woven glass fibers or carbon fibers or high stiffness organic fibers such as those manufactured by Du Pont under the trademark "K"
A web 52 of fibers sold under the name ``Evlar'' passes from a spool 51 via a number of rolls 53 through an aqueous suspension of an inorganic solid lubricant such as lead or lead oxide powder and PTFE.

Inorganic solid lubricants may be excluded for certain layers.

A propeller 49 driven by a motor 50 is used to obtain a uniform distribution of particles in the suspension.

While passing through the suspension, the web 52 is impregnated with a mixture of PTFE and inorganic solid lubricant.

The impregnated web is then passed through a drying and curing oven 54 to a take-up spool 55.

FIG. 8 schematically shows the production of a laminated blade.

Multiple layers 57 are loaded onto spool 56 in a desired order.

These layers may be reinforced with woven glass fibers or bonded to foil.

Layer 57 is heated with a hot air preheater 58, which emits air at approximately 300° C. when PTFE is used in the layer.

The layers 57 are then passed together between a pair of heated rolls 59, the temperature of which is approximately 350°C.

The laminated web then passes between a pair of rolls 60 to cool the laminated body.

The vanes 64 are then stamped from the web by a stamping press 61.

The vane 64 is housed in a container 63 and the excess material is rolled up by a winding spool 62.

This method is particularly suitable for making blades of the type shown in FIGS.

The other layers or cores 33, 40 used in the embodiment shown in FIGS. 3 and 4 are made of a mixture of PTFE, glass, and an inorganic solid lubricant.

The mixture is then packed and sintered.

The illustrated embodiments of the invention described above are merely illustrative and may be modified within the scope of the claims.

[Brief explanation of the drawing]

1 is a sectional view of the vane motor taken along arrow 1-1 in FIG. 2, FIG. 2 is a sectional view taken along arrow 2-2 in FIG.
The figure is a sectional view showing a first embodiment of a blade used in a rotary blade machine according to the present invention, FIG. 4 is a sectional view showing a second embodiment of the blade, and FIG. 5 is a sectional view of a third embodiment of the blade. , FIG. 6 is a sectional view showing a fourth embodiment of the blade, and FIG. 7 is a view schematically showing the manufacturing process of a reinforced layer containing an inorganic solid lubricant.
FIG. 8 is a diagram schematically showing the production of a layered blade. In the figure, 11... cylinder, 13... end plate, 16... rotor, 30... inlet,
31...Exit, 20...Blade, 31'
, 34... Reinforced layer, 33... Another layer.

Claims (1)

[Claims] 1. A cylinder 11 with two opposing end plates 13;
Compressible working medium inlet, outlet device 30.31 and rotor 1 eccentrically journal-bearing in cylinder 11
6 and a generally radial slot 1 in the rotor 16 so as to maintain sealing contact with the cylinder 11 during rotation of the rotor 16.
9, each blade 20 has a large number of blades 20 that can slide within the
comprises at least two layers 31', 34 spaced from each other and comprising a fluorocarbon polymer reinforced with glass or carbon fibres, each said vane 20 having a further layer 33 between said reinforced layers; A rotary vane machine characterized in that the layer 33 is provided with a metal-based inorganic solid lubricant on at least the surface in sealing contact with the cylinder 11. 2 a cylinder 11 with two opposed end plates 13;
Compressible working medium inlet, outlet device 30.31 and rotor 1 eccentrically journal-bearing in cylinder 11
6 and a generally radial slot 1 in the rotor 16 so as to maintain sealing contact with the cylinder 11 during rotation of the rotor 16.
9, each blade 20 has a large number of blades 20 that can slide within the
A rotary blade machine characterized in that it comprises a stack of a number of reinforced layers 41 separated by unreinforced layers 42 containing an inorganic solid lubricant. 3 a cylinder 11 with two opposed end plates 13;
Compressible working medium inlet, outlet device 30.31 and rotor 1 eccentrically journal-bearing in cylinder 11
6 and a generally radial slot 1 in the rotor 16 so as to maintain sealing contact with the cylinder 11 during rotation of the rotor 16.
9, each blade 20 has a large number of blades 20 that can slide within the
A rotary blade machine characterized in that it comprises a stack of a number of reinforced layers 45 directly joined to each other and containing an inorganic solid lubricant. 4 Claim 1.2.3 in which the inorganic solid lubricant is provided only near the surface that makes sealing contact with the cylinder 11
A rotary blade machine as described in any of paragraphs. 5. Rotary vane machine according to claim 1, in which the reinforced layers 31', 34 consist of PTFE reinforced with woven glass fibers. 6. The rotary blade machine according to any one of claims 1 to 4, wherein the inorganic solid lubricant is lead or lead oxide. 7. The rotary blade machine according to claim 2, wherein the unreinforced layer 42 is a foil of fluorinated ethylene propylene polymer. 8. A rotary blade machine according to claim 2, wherein the unreinforced layer 42 is a polyfluoroalkoxy polymer foil. 9. A rotary vane machine according to claim 1, in which the reinforced layers 31', 34 consist of PTFE reinforced with carbon fibres.