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0d. 25, ‘1938. , 2,134,542 C. F. ALSING FLOW RESTRICTOR Filed Aug. v31, 1955 2 In . \ \ \.~ ‘IIVIIIII I, , Facs- E. WITNESSES: ' '_ INVENTOR ‘ CARL. E ALSLNG. MW ATTORN 2,134,542 Patented Oct. 25, 1938 UNITED STATES PATENT- OFFICE 2,134,542 FLOW RE STRICTOR Carl F. Alsing, Spring?eld, Mass, assignor to Westinghouse Electric & Manufacturing Conn pany, East Pittsburgh, Pa., a corporation of Pennsylvania Application August 31, 1936, Serial No. 98,754 3 Claims. (Cl. 62—1) My invention relates to a- ?ow restrictor for restricting the ?ow of ?uid from a high to a low pressure region, and particularly to a ?ow re strictor for restricting and lowering the pres i sure ‘of liquid refrigerant passing from the con denser to the evaporator of a refrigerating sys tem. It is an object of my invention to provide an improved flow restrictor of the capillary passage 0 type in which clogging of the passage by lint and dirt is practically eliminated. , It is another object of my invention to provide an improved ?ow restrictor of the capillary tube type for use in a refrigerating system in which iii refrigerant and lubricant are in contact with the windings of the motor driving the compressor. These and other objects are effected by my in Such devices are referred to by some in the re frigerator art as capillary tubes. One end 26 of the tube 24 extends into the evaporator 2|, and the inlet end 21 of the tube extends into a ?tting 28 having a chamber 29 into which liquid 5 refrigerant from the condenser i6 is conveyed through the conduit Hi. In refrigerating systems employing capillary tube type ?ow restricting devices, the inlet end of the small passageway in the tube may clog because small shreds of lint from the insulation on the motor, pieces of dirt and the like catch on the sharp edges of the tube, crosswise of the opening of the passage 25. After a few such par ticles adhere to the inlet of the tube, other par- 35 ticles add rapidly to those already caught and eventually bridge and clog the passage, necessi vention-as will be apparent from the following tating opening the system to clean the tube, which description and claims taken in connection with is obviously very expensive and troublesome. In order to obviate these difllculties, I have 20 20 the accompanying drawing and forming apart rounded the inlet edge of the tube 245, as shown of this application, in which: Fig. i is a diagrammatic view of 'a compressor at 35. I have, furthermore, tapered the outer refrigerating system embodying my invention; surface of the tube at the inlet end as shown at 32. By so forming the capillary tube 2t, shreds and, 25 Fig. 2 is an enlarged view of the inlet end of of lint, dirt and the like, when they contact the the flow restrictor shown in Fig. 1 as a capillary rounded edge and tapered sides 32, slide ed the edge and either pass through the passage 25 tube. lengthwise, as shown at 33, or pass to the out Referring to the drawing for a detailed descrip tion of my invention, numeral l l designates a side of the tube 2d along the tapered sides 32. Furthermore, by rounding the edge of the tube sealed casing containing a motor l2 and a re frigerant compressor i3. Refrigerant is drawn 24, its flow characteristics are improved because turbulence at the inlet thereof is reduced. ' from the interior of the casing H through a com From the foregoing it will be apparent that I pressor inlet ill and compressed refrigerant is have provided an improved ?ow-restricting de forced through an outlet conduit IE to a con vice which will not clog up with lint and dirt, and 35 35 denser lt wherein it is condensed by the air driv en over the condenser by a fan IT. Liquid re frigerant is conveyed from the condenser l6 through a conduit i8 to a flow restricting and pressure reducing device generally indicated at Refrigerant is admitted through 40 l9 (Fig. 1). the flow restricting device M to an evaporator 2|, wherein liquid refrigerant at low pressure va porizes and absorbs heat. Refrigerant vapor is withdrawn from the evaporator 2| through a con duit 22 by the action of the compressor l3 and enters the interior of the sealed casing H, where it comesin contact with windings 23 of the mo tor l2. The motor windings are usually insu lated with cloth or paper and shreds of the in sulation may be present in the refrigerant. The flow restricting device l9 preferably com prises a helically coiled tube 24 of considerable length and having a passage 25 therein of rela tively small bore so as to restrict the ?ow of liquid from the condenser to the evaporator 2!. which is designed for use with a hermetically sealed motor-compressor unit wherein the refrig erant is in contact with the insulated windings of the motor. ‘ While I have shown my invention in but one 40 form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modi?cations without de_ parting from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims. What I claim is: . v 1. In a refrigerating system, the combination 50 of a condenser and an evaporator in which re frigerant is successively condensed and evaporat ed, said condenser forming a part of the high pressure region of the system, and a device for restricting the ?ow of refrigerant between the M 2 9, 184,542 ‘ condenser and the evaporator, said device com end of the tube extending into the portion prising a tube having a restricted flow passage inlet of the relatively larger flow area. therein, the inner edge of the tube at the inlet 3. In a refrigerating system, the combination end having inwardly converging walls, forming WI an entrance to said passage, and the material _of an evaporator and a condenser in which re-' frigerant is successively evaporated and conbetween the wall of the passage and the outer densed, said condenser formin a portion of the wall of the tube at the inlet end being rounded, high pressure region of the refrigerating system, whereby a smooth surface is provided at the inlet a motor and a compressor for circulating refrig end, said high pressure region of the refrigerat erant to the evaporator and condenser, a sealed 10 ing system having a portion of larger flow area casing for enclosing the motor and compressor 2 than 'said tube, said inlet end of the tube ex and containing some of said refrigerant in con tending into said portion of larger‘?ow area. 2. A capillary tube for a refrigerator system, ‘which system includes an evaporator and a con ‘ denser in which refrigerant is successively evap orated and condensed, said condenser forming a portion of a high pressure region of the re frigerating system, said capillary tube having a relatively restricted bore of uniform diameter for controlling the ?ow of liquid refrigerant from the condenser to the evaporator, the walls of the bore being curved outwardly adjacent the ex ‘ tremity of the tube, said curved walls meeting at a point adjacent the entrance of the tube, whereby a smooth surface is provided at said inlet end, said high pressure region of’ the re frigerating system having a portion of larger cross sectional area than the area de?ned by the outer circumference of said tube, and said tact with both the motor‘ and compressor, and means including a capillary tube having a rela tively restricted bore of uniform diameter for controlling the ?ow of liquid refrigerant from the condenser to the evaporator, the walls of the bore being curved outwardly adjacent the ex tremity of the tube, and the outer walls of the tube being curved inwardly adjacent the extrem ity of the tube, said curved walls meeting at a point adjacent the entrance of the tube, whereby a smooth surface is provided at said inlet end, said high pressure region of the refrigerating system having a portion of larger cross sectional area than the area defined by the outer circum ference of said tube, and said inlet end of the tube extending into the portion of the relatively larger flow area. CARL F. AISING.