US 3106334 A
Description (OCR text may contain errors)
1963 s. F. FOGLEMAN ETAL 3,105,334
CENTRIFUGAL REFRIGERATION COMPRESSOR MOTOR Filed June 2'7, 1961 uvmvrozes 5AM F. FoaLs/vmu, Gus A. FoaLEMAA/ JR.
HERBERT C. Sam/1.25
Arrozwsy United States Patent 3,166,334 CENTRTFUGAL REFRIGERATION COMPRESSOR MOTUR Sam F. Fogleman, 4941 Mount Frissell Drive, San Diego, Calif., and Gus A. Fogleman, J12, 3365 Iverness St., Riverside, Calif.
Filed June 27, 1961, Ser. No. 120,047 4 Claims. (Cl. 230-117) This invention relates generally to centrifugal compressor motors and particularly to lubricant sealed electric motors having a surrounding casing providing means for vaporizing liquid droplets from low pressure refrigerant vapors.
One of the main objects of the invention is to provide a vertically positioned lubricant sealed electric motor having a spiral vaned surrounding casing for vaporizing liquid droplets in the suction refrigerant gases.
Another object of the invention is to free liquid droplets from the low pressure refrigerant vapors during movement thereof about the centrifugal compressor motor and before entrance into the compressor.
Still another object of the invention is to provide a vertically positioned centrifugal compressor motor that is lubricant sealed in a housing restricted from refrigerant vapors.
A further object of the invention lies in the vertical connection of a lubricant sealed electrical motor with a conventional centrifugal compressor and the provision of motor shaft sealing means for restricting refrigerant vapors from the motor.
A still further object of the invention is to provide a combined motor lubricating system and surrounding means for completely vaporizing low pressure refrigerant vapors prior to their passage to a centrifugal compressor.
Another object of the invention is in the provision of a housed lubricant covered vertically disposed electric motor and a spiral v-aned low pressure surrounding vapor conduit operating to support and cool the motor by extraction of heat from the conduit by the refrigerant gases.
The foregoing and other objects and advantages of this invention will be clear to those skilled in the art upon reading the following specifications in connection with the attached drawings, in which:
FIGURE 1 is a plan view of the compressor motor representing a preferred embodiment of the invention;
FIGURE 2 is an elevati-onal view partially broken away; and
FIGURE 3 is an enlarged vertical section taken on the line 3-4) of FIGURE 1.
Referring to the drawings in which a preferred embodiment of the invention is shown, the compressor motor and surrounding spiral refrigerant vapor conduit is generally referred to as M. A centrifugal compressor of conventional design surrnounts the motor M and is operatively connected thereto. The centrifugal compressor has been designated generally as C.
The compressor motor and refrigerant vapor conductor M of the present invention comprises an outer vertically disposed cylindrical casing having a bottom 12. A base plate 14 of the centrifugal compressor C is securely bolted in the plural manner 16 to the casing ltland forms a top sealing cover aperture-d centrally at 17. An upper low pressure suction chamber or conduit 18 is secured at 20 to an outlet 21 in the casing 10. The chamber 18 is connected to the conventional centrifugal compressor C at 22 and the suction vapors are drawn into a conventional centrifugal impeller 23 thereof.
A vertically positioned cylindrical motor housing 24 within the casing 14? has a base 26 securely bolted at 28 and sealed at 30 on the bottom 12 of the outer casing 3,196,334 Patented Oct. 8, 1963 10. A motor housing top plate 32 is apertured centrally at 34 and bolted at 36 and sealed at 38, respectively, on the expanded upper edge 46 of the casing 24-. A casing 42 of a conventional electric motor 44 is pressed into and secured to the inner wall of the motor housing 24. Upper and lower bearings 46 and 48, respectively, of conventional design, and not shown in detail, support a vertical motor shaft 50. The motor shaft 50 projects through the apertures 34 and 17 of the plates 14 and 32, respectively, and is keyed at 52 to the impeller 23 of the conventional centrifugal compressor C. A labyrinth seal 54- secured between the plates 14 and 32 restricts the flow of refrigerant vapors into the motor housing 24.
Continuous spiral vanes 56 surround and are secured to the outer periphery of the motor housing 24. The outer edges of the spiral vanes 56 are secured to the inner periphery of the outer casing 16. A continuous groove 58 is formed adjacent to the outer edges of the spiral vanes 56 to permit downward flow of any liquid droplets from the suction vapor, as will be described later. A suction refrigerant vapor inlet tube 60 tangentially enters the spiral vapor conduit 62 formed by the upwardly ascending vanes 56. The interior of the motor housing 24 is almost entirely filled with lubricating oil 0 and the upper and lower bearings 46 and 43 of motor 44 are covered at all times.
The electric motor vertically supported, sealed and continuously lubricated within the motor housing 24-, is secured against horizontal movement by the outside casing 10 connected thereto by the continuous intervening spiral vanes 56. The refrigerant vapor entering the conduit 62 about the motor housing 24 maintains its highly rotating velocity until it flows into the suction chamber 18. During the aforementioned passage of the highly rotating vapor the lighter suction vapor is continually turning and flowing upward, whereas any liquid droplets that may be contained within the vapor tend to flow straight onto the inside peripheral surface of the casing 10. Consequently the liquid droplets are separated out in a centrifugal separator action and they fall downward along the outer peripheral edges and groove 58 of the spiral vanes 56. The electric motor operates at higher temperature than the refrigerant suction vapor and liquid droplets. Conductive flow of heat from the motor through the housing 24, spiral vanes 56 and casing 10 superheats the suction vapor and liquid droplets so that a dry vapor enters the centrifugal compressor inlet. The heat transfer into the refrigerant suction vapors also provides cooling of the electric motor. The labyrinth seal 54 restricts the entrance of the refrigerant vapor within the motor housing. Therefore, the dry suction vapor may pass through the chamber or conduit 18 into the conventional compressor C induced by the impeller 22.
While the embodiment of our invention shown herein is fully capable of performing the objects and advantages desired, it will be apparent to those skilled in the art that numerous modifications may be made without departing from the inventive concept disclosed herein. It is not intended that this invention be limited by the embodiments disclosed but only as necessary in accordance with the appended claims.
1. A refrigerant vaporizing device, comprising;
a hollow cylindrical outer housing adapted to be vertically disposed, and having closed upper and lower ends;
a compressor unit including a rotatable impeller centrally disposed upon said housing upper end, and having a vapor inlet opening;
a cylindrical motor housing having a motor disposed therein with the motor shaft protruding from one end thereof, said motor housing being of substantial- 1y lesser diameter than said outer housing and concentrically disposed therein with said motor shaft extending through an opening in said upper end of said outer housing and drivingly engaging said impeller;
a vapor inlet tube coupled to an opening in the circumferential surface near the lower end of said outer housing for delivering vapor int-o the annular space between said housings in a direction substantially tangential thereto;
a vapor outlet tube coupled between an opening near the upper end of said outer housing and said vapor inlet opening of said compressor;
and a fiat strip of material disposed perpendicular to the longitudinal wall of said outer housing and wound about said motor housing in a plurality of helical turns so as to define Within said annular space a vapor channel extending helically from said vapor inlet tube to said vapor outlet tube.
2. A device as claimed in claim 1 wherein said fiat strip has an upwardly facing groove formed adjacent the outer circumferential edge thereof for continuously carrying condensed droplets of refrigerant downward toward said vapor inlet tube.
3. A motor mount and refrigerant vaporizing device 25 for attachment to a centrifugal compressor comprising:
a sealed housing; an oil covered electric motor vertically supported in said housing and having a drive shaft projecting upwardly therefrom; a casing and refrigerant chamber surrounding the sides and top and connected to the base of said housing; a centrifugal compressor, drive connected to said shaft and having an outlet, a compressor inlet communicating with the interior of said casing; spiral vanes disposed between and connected to said housing and easing, whereby liquid droplets will be discharged from said vapor and vaporized by heat transferred from the electric motor before entrance to said centrifugal compressor; and means for sealing said drive shaft against the entrance of refrigerant vapors.
4. A device as set forth in claim 3 in which said last means is a labyrinth seal disposed between the said housing and casing and about said drive shaft adapted to prevent overpressure within said housing.
Referenccs Cited in the file of this patent UNITED STATES PATENTS 835,836 Schulz Nov. 13, 1906 1,970,484 Arutunoff Aug. 14, 1934 2,001,172 Wintroath May 14, 1935 FOREIGN PATENTS 547,855 Italy Sept. 15, 1956