US2448233A

US2448233A - Rotary intersecting vane engine and compressor

Info

Publication number: US2448233A
Application number: US563527A
Authority: US
Inventors: Nyborg Tage Georg
Original assignee: Mining Engineering Co Ltd MECO
Current assignee: Mining Engineering Co Ltd MECO
Priority date: 1943-11-02
Filing date: 1944-11-15
Publication date: 1948-08-31
Anticipated expiration: 1965-08-31

Description

Aug. 31, 1948. T. G. NYBQRG ROTARY INTERSECTING VANE ENGINE. AND COMPRESSOR 2 Sheets-Sheet 1 Filed Nov. 15, 1944 Inventor Attorney Aug. 31, 1948. v T; G. N YBO RG. 2,443,233

ROTARY INTERSECTING VANE ENGINE AND COMPRESSOR .2 Sheets-Sheet 2 Filed Nov. 15, 1944 PIC-7.2;

we G .'/l /iara Attorney Patented Aug. 31, 1948 ROTARYINTERSEOTING VANE ENGINE AnnooMPREssoR --Tage Georg Nybor'g, worcester, England, assigntor of one-half to: The Mining Engineering Company Limited, Worcester, England Application November 15, 1944,,Serial No. 563,527 In Great Britain November 2, I943 1- a In rotary engines or compressors of the-vane type in which intersecting blades of fixed lengths are slidably mounted in slotsin a cylindrical rotor which rotates in a cylinder of such form that both ends of the blade are at all times in contact with the inner; surfaces of the cylinder (i. e., a Limacon or the like) it is usual to construct the rotor in two or more vpiecesfito. facilitate assembly of the blades in 'the rotor or to have the blades of L shape. "The present invention is primarily de-' signed-to enable a one-piece rotor to be used with bladesof robust symmetrical form, preferably of channel former of I .form and channel form; the 1' representing two channels placed back to back. This is accomplishedbyextending the slotting of the-rotornbody into a cylindricalportion of reduced diameter, preferably at both ends, so that one at least of the blades can temporarily extend into a slot extension outside .the operativeslottin'g'during assembly of the blades in the rotor. This enables the axial dimensions of the central parts of the blades (the webs'of channel or I shapes) to be kept to any size desired within the total operative length.

It will be observed that this construction makes it particularly desirable (unless the slot extension is afterwards filled) to prevent fluid leakage between the rotor end faces and the end plates of the cylinder and another important part of the invention is designed for this purpose. Many methods of preventing such leakage such as spring loaded packing strips and the like have been suggested. In general, these embody loose parts which cause complication in manufacture and maintenance. The necessity for such self adjusting devices commonly arises because the clearances must be considerably less than can be achieved by commercial limits of manufacture.

The above and other parts of the invention are embodied in a typical form of motor which will now be described with reference to the accompanying drawings. The parts of the invention for which a monopoly is desired'are those delimited by the claims.

In the drawings- Fig. 1 is a central longitudinal section,

Fig. 2 is a central cross section, one half of the rotor being shown in end elevation, and

Fig. 3 is a partly sectional side elevation of the rotor.

The stator of the motor is of more or less conventional form with a flanged cylinder portion l of limacon form provided with inlet and outlet passages 2 and 3, and end pieces 4 and 5 with corresponding flanges bolted in the usual manner 3 Claims. (01. 103-438 (not shown) to the cylinder portion and with short spigot pieces 6 and l which fit intothe bore andform the end walls of the working cylinder.

The rotor comprises a hollow cylindrical body 8 extended at either end with a reduced diameter at 9, I0 and further extended on a still further reduced diameter at ll, 12 to form journal bearings which may be of any suitable type. One end is extended at l3 for driving purposes.

The main cylindrical body 8 is pierced by two slots l4, l5 substantially at right angles extending substantially into the reduced diameter pore tions at either end and isbored near the periphery to receive D pads l6of antifriction material between which the blades slide.

One blade extending the full length of the cylinder maybe of I form and, as shownpthe I is constituted by two channel blade portions ll, [8 back to back, while the other comprises two portions:-l:9,.20 of channel form, facing inwards.,

It will be understood that one blade portion 20 is inserted in one of the rotor slots with the open side of the channel inwards and moved over to the end of the slot, both blade portions [1, Id of the transverse pair with the open sides of the channels outward (or a single I-shaped blade) then inserted in the second rotor slot can thus be moved over into the channel recess of the first blade portion 20, when the second blade portion l-9 with the channel facing inwards can be inserted (see Fig. 3) and the whole centered in due course.

The ends of the rotor cylinder 8 are provided near the periphery with arcuate grooves 2| (Fig. 3) preferably of dove-tail section extending between the slots or D-pads; into these grooves is inserted antifriction bearing metal 22 (white metal or the like) the outer surface of which is concave. so that two relatively thin arcuate line faces 23 (Fig. 2) project slightly and bear against the cylinder end plates.

' As shown the bearings are of tapered roller type to give accurate longitudinal location of the rotor, as indicated at 24, enclosed by end caps 25.

In practice the overall length of the rotor cylinder (i. e., that of the antifriction metal arcs and D-pads) is made slightly greater than the distance between the cylinder and plates so that, initially, there is fairly considerable interference between the rotor and the cylinder end walls. As the machine is assembled and run the thin line faces of the antifriction metal bed down until the requisite working clearance is attained.

The outer ends of the blades are of suitable form to engage pads 26 inserted between them and the wall of the working cylinder, the form of the recess in the pad and of the projection on the vane being such that the relative movement is rotary or a rolling contact after the manner of a gear tooth.

It has previously been suggested that a pad between the end of the blade and the working cylinder wall should take the form of a gear tooth projection inwards and mating with a recess in i' blade- If desired, by using more blades of similar forms this length can be reduced, the channel being of approximately the same axial dimension as the web of a channel blade and the web also representing about half the axial length of an I shaped blade, Whether integral or made up of two channels.

I claim:

1. In a rotary machine having a rotor provided with intersecting slots, a plurality of blades fitted in said slots, each of said blades having a slot extending axially from one transverse edge for a length substantially corresponding to one-half of the axial dimension of the blade, a pair of said blades being disposed so that the slots therein open toward the ends of the rotor and a second pair of blades being arranged with their slots opening toward the center of the rotor, so that the slots of each pair of blades receive intersecting pair of blades.

2. In a rotary machine, a stator having a main cylinder and reduced cylindrical end portions, a one-piece rotor having a body substantially cor- 4 responding to the axial dimension of the main cylinder of the stator, said rotor body having end projections extending into the end portions of the stator, said rotor having intersecting slots extending axially of the :body and one of said slots extending into and diametrically through the end projections of the rotor, and a plurality of blades of channel shaped contour fitted in the 1 slots of the rotor with the slots of one pair of blades receiving the other pair of blades that the respective pairs of blades are in contacting axially'co-extensive arrangement assembled by initial insertion of one of a pair of blades through the extended slot of the rotor.

3. A construction *as defined in claim 2, wherein the slots of each blade have a length axially of the blade corresponding to one-half the axial dimension of the blade, a pair of said blades disposed'so that the slots therein open towards the end of the rotor and the complementary pair of blades being arranged with their slots opening toward the center of the rotor. TAGE GEORG NYBORG.

REFERENCES CITED The following references are or record in the file of this patent:

UNITED STATES PATENTS Great Britain May 30,1945