US1626768A

US1626768A - Rotary compressor

Info

Publication number: US1626768A
Application number: US93184A
Authority: US
Inventors: Carl W Vollmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-03-08
Filing date: 1926-03-08
Publication date: 1927-05-03
Anticipated expiration: 1944-05-03

Description

May 3, 1927. 1,626,768

C. W. VOLLMANN ROTARY COMPRESSOR- Filed March 8. 1926V 2 Sheets-Sheet-'1 l IDI WJ 1K 2 Sheets-Sheet 2 c. w. VOLLMANN ROTARY COMPRESSDR Filed Marh 8, 1926 Patented May 3, 1927. l

UNITED STATES Aram" oFFc-E.

CARL VOLLMANN,0-F MONTREALQUEBEC, CANADA.

ROTARY COMPRESSOR.

Application led'uMarch 8, 1926. Serial No. 93,184.

My invention relates particularly to rotary gas'compressors of the type in which a lubricating circuit is included and has for Its object to provide a self-contained compact machine which will embody the gas compressor members and the 'lubricating circuit within a single cylinder, and provide greater security for the' How of the oil.

To 'this end the invention broadly stated consists of a cylindrical oil chamber contained within the cylinder and containing rotary gas compressing members, the cylinder being so constructed as to present a relatively shallow oil chamber within the cylinf der beneath the cylindrical oil chamber, and

having' in connection therewith a vertical v oil and gas passage between the inner end Figure 2 is an axial vertical sectional viewtaken on line-2 2 Figure 1;

Figure 3 is a vertical sectional View taken on line 3-3 Figure 1;

Figure .L1 is a transverse vertical sectional view taken on line 4-f4 Figure '2;

Figure 5 is a top or plan view of my improved rotary compressor;

Figure taken on line 6-6 Figure 1; t

Figures 7, 8, and 9 'are details of the surrounding and intercommunicating oil channels;

Figures 1() and 11 illustrate lin longitudinal and transverse sectional 4'views respec-l tively, the encircling oil chambers 'for spreading the oil between the' adjacent fric-v tion surfaces;

Figure 12 being a perspective view of the end of one of the shafts to -indicate the transverse groove forintercommunication with/ the encircling chambers; and

Figure 13 is a ,diagrammatic view of a 6 isa horizontal' sectional view` refrigerating system with my invention applied thereto.

Rotary compressors as heretofore constructed have employed an external system of lubrication and separation of the oil from the gas.- That is to say the body of the lubricant is-carried outside and independently of the compressor and connected to the latter bya system of .external piping in connection with ducts| leading through the frame of the machine to the'points where lubrication is required.-

. According to my present invention the rotary compressor is equipped with intermeshing spiral gears of cylindrical forni mounted in intel-meshing relation on a pair of shafts b and o journalled at one end in .the cylinder head d and the opposite end inv the head e of the gear case f carried by the cylinder head d. This gear case is enclosed by an internal oil chamber g forming an integral part of the cylinder h`upon which the cylinder head d is mounted. This cylinder has a base c' within.wl1ich a /main oil chamber j is formed and extends below and upwardly between the inner end of the internal oil chamber and the end wall k of the cylinder. The dividing wall g1 separating Athe internal oil chamber from the end of the cylinder has a gas port m near its upper end and an oil port n near its lower en d.

The gas port communicates with a gas and oil separator consisting of a series of baer plates o, o1 and o2. 'Ihe first plate extends from a top plate o3 downward to a point below the port but above the oil level; the second plate extending from slightlyabove the level of the port 4to a point below the level of the oil; the third plate extends, like the first plate, from the cover plate to a point below the port but above the oil level.

' The upper end of the chamber s between these walls carries a gas discharge fitting t of the usual type'in compressors o f this class, the bottomof the outer oil'chamber is provided'at one cornerwith aY suction port u protected'by a strainerl fv. The gas Icompressing spiral gears .and 'their operating.

mechanism contained within the gear'case are of usual vconstru'r-3tion and consist of the interemshng :cylindrical

spiral gears

10, 12 and the'intermeshing driving spiral gears 13 and 141 respectively,'separated by a partition 16 having a port ,17 eifecting communication between the discharge end o f the gears and 12 and the` suction end of the

gears

13 and 14. The respective pairs of gears communicate with suction chamber V end' of the gear case.

' the gear 13 is free on its shaft.

and -discharge chamber 21 in` the cylinder head and a discharge port 22 in the inner he gears 10, 12 and 14 are keyed to their respective shafts while The purpose of this arrangement is to ensure rotation of the countershaft to augment the lubrication of the end of such countershaft.

The oil ducts are located one, 25, `in the end 26y of the cylinder and communicating at one end with the oil discharge port u and at its opposite end through a port 27 with a port 28 leading obliguelv to the end of the bearing of the countershaft 29 carrying the gears l() and`13. The opposite side of this end of the journal lbearing has communicating therewith an -oblique duct 30 communicating at its opposite end through the inner face ofthe cylinder head with the teeth of the gear 10. ,By means of these ducts 4the oil iindsits way to the journal 29 and to the teeth of gear 10 thence to the other gears within the gear case. All these ducts are, for convenience, located in the same ;vertic al plane. The main shaft is lubricated and`sealed by 'an oblique pont-31 extending in a horizontal plane from' the -side of theAV journal bearing on the countershaft to the bearing 32 and through which the main shaft extends. vThe suction port 21 is connected as usual to the. discharge port of 'the' refrigerator indicated` at 41 by apipe40.

' To facilitate the spreading of the oil bel tween the various friction surfaces I form bearing ,of the counter shaft. These encircling chambers serve the double purpose lof lubricating and sealing the bearing and thusefectively prevent leaka e of gas. lTp .further augmentA the spreading ofy the o1l the end ofthe counter-shaft has a transverse i groove=52 in intercommunication'with the A adjacent encircling groove 51.

In order to obviate any disturbance in the uniform flow of ,oil through the machine the initial supply port 25 is duplicatedfat- .the opposite? sides of the machine as shown in Fig. 1, and there are a pair of strainersv as shown in Fig. 5. The effect is that in the event of either of these ducts 25,'Wh1ch i both lead from the main oil chamber y', being by the other duct.V f

blocked'the supply of oil will maintained Duringy he opera'tlon of the compressor y. the gas beingcom ressed` passes throughl the upper part of t e internal oil chamber the oil and gas' separatorto the dis-A charge fitting t from which it flows by. pipe ,42 to the condenser 43 in the usual way and.

from Athe. condenser 'to 'the refrigerator through a pipe 44, a controller 45` and a refrigerator charging pipe 46. The suction' exerted by the compressor dra-ws the expended gas from the refrigeratorthrough pipe 40.- This pipe 40 is provided with a check 70 valve to prevent oil leaking from the compressor through the pipe 40 as is liable to occur when the machine is stopped or for other reasons. It is well known thatwhen the machine is' stopped the pressure in the pres- 75 sure end of the compressor is greater than the pressure in the suctionend and there beingv no impelling force to check it, the gears being idle, the oil accumulated in chamber 2O and infact all'the oil in'the suction end of ,'80

started up the check Valve does not retard i the upward flow of gas through the ipe 40 to the suction port 21 and suction'cliamber 20. to the gas compressing gears... During this yoperation the oilV circulates through the various ducts, between the intermeshing surfaces of the gears, between thegears and wall presented by the cylinder head, partition 16 and innerv end of the gear case and f through the

chambers

20, 18, 17 and 19 and port 22 from which latter .it drops down in 95 the internal` oil chamber and` joins the body of oil in the base of 'the machine. The com pressed gas passes through port 14 and. as it is in a measure la'dened with oil it is made the discharge fitting. In this manner the l gas is subjected 'to two stages of separation,

in the rst it tends to separate 'from the gas by gravitation and it drops from-port 22.

By the structural features of 1n im- 105` proved rotarygas'compressor -it will ob?- served, an internal lubricatin s stem is provided, the oil floods the sha earings .and consequently hermetically seals them against' escape of gas there, the two stages of sepadischarge fitting ensures the supply of gas entirely'free from oil, while in the event of the machlne being shut down or'the pressure at the suction ports, 'for other/reasons, dropping below vthe pressure, at the inner end of the machine, the tendency of oil to leak into the suction check -valve 50.

What I claim is as follows:

1.v A rotary gas compressor comprising a cyhnder havingv an inlet'for theas to be com ressed, a cylindrical oil cham r with-v in -t e cylinderfand containing rotary gas compressingmembers; a shallow -horizontal Ioil chamber between the bottom of the cylindrical oil chamber 4and the base ofr the cylinder; and aA verticalas and oil passage between the inner end cfg ration of the oil from thegas during its 4 ntransit from the compressing gears 'to the pipe 1s checked byv the 120 the cylindrical oil 13 .a gas discharge fitting,

chamber and the corresponding end of the cylinder; the oil chamber in the base having an oil' intake, the top ofthe passage having and the inner wall of the cylindrical oil chamber having` a gas discharge port and a port effecting communication between the oil chambers andconstitutingtherewith a closed lcircuit within i the cylinder and Ym ber and all friction surfaces, tial oil `connection between the oil chamber in lthe base and the oil containing spaces -within the compresor.

2. rotary gas compressor such as claimed in claim 1, having an oil and gas separator within the upper end of the oil and gas passage, such separator consisting of va series of baille plates located at said orts. p

3L rotar.)7 gas compressor comprising a Vhousing having a base containing a relatively shallow oil' chamber, an upwardly curved 'top Aand an internal downwardly curved horizontal partition concentric to and forming an integral continuation of the the level of the top and constituting with the top a cylinder compressed; and such.

Apartiallnjvithin the sides of the housing,

such cy der having Van inlet for the gas to including the said oil cham` a duplex in- 1 sides extendingdownwardly from the sides of the cylinder thus formed to and merging in the base, a vertical wall closing the inner end of the cylinder and having therein a gas discharge ort near its upper end and an oil port near its lower end, both ofthe said ports communicating with the interior of the cylinder, the cyhnder head closing the cylinder, va vertica transverse wall formed integrally with the adjacentend of the base and connecting the same to the cylinder, a vertical transverse wall formed integrally with the opposite end the outer end of l of the base and lspaced from that end `of the cylinder andextending upwardly to a point above the cylinder top and having sides extending to and merging in the cyl-- inder -wall and forming a vertical oil and gas passage, a discharge fitting mounted on thev top `of' the said passage,` the cylinder containing rotary gas compressing members, means for operating the gas compressing members, a lubricating system in a, closed circuit within the housing and including the oil chambers andall friction surfaces and shaft bearings.

In testimony name.

l l CARL W. YOLLMANN. A

whereof I have signed my