Патент USA US2117861код для вставки
May 17, 1938. 2,117,861 c. sTEl-:NsTRUP EVAPORATOR FOR REFRIGERATING MACHINES Filed Aug. 29, 1956 n ____Z._ _ 4 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ "T ’L î _ _) _ _: __ _ _Q_ T _ __ ,_ _ _ _ __ . r 33 _ _(______-_ \l/|\IHl/M _/ _ _ _ @_\ ._\J_ _"_„_ _ " _.„î_.„ _ _ _ _ _ __ n _ _ _ _ _ _ _ _ _ _ _ _ _ _ \| .A l lnventor‘ : Chrîstîan Steenstrup, by/Í‘íâ M6. Attorney. Patented May i1, 193s ' ` ‘ 2,112,861 AUNITED STATES PATENT OFFICE cin-nnen Steenstrup, Schenectady, N. y., ae slgnor to General Electric Company, a corpo ration of New York - 'Application August 29, 1936, Serial No. 98,456 3 Claims. My invention relates to evaporators or cooling , units for refrigerating machines. It is an object of my invention to provide an improved evaporator of the flooded type for re5 frigerating machines, having a header and a plu- rality of U-shaped depending refrigerant clrcu- (Cl. 62-126) a cylindrical header 20 from which it is with drawn through a suction conduit 2l and is re turned to the casing I4. 'I'his cycle of operation continues as long as thecompressor Within the casing is operating. The temperature within the 5 compartment II is regulated thermostatically in lating passages and having an improved arrange- the usual manner by controlling the operation ment for providing a rapid and efficient positive of the motor which drives the compressor Within circulation of liquid refrigerant through the pas- the casing I4. 10 sages thereof. In evaporators of the flooded type it is desir- 10 Another object of my invention is to provide an able to provide some arrangement for producing improved evaporator of the flooded type for re- a rapid circulation of liquid refrigerant and a frigerating machines which shall provide a posi- recirculation of liquid refrigerant from the header tive and eñicient circulation of liquid refrigerant through the refrigerant circulating passages. An 15 with a minimum of turbulence within the header. , increased rate of circulation of liquid refrigerant 15 Further objects and advantages of my inven- increases the rate of absorption of heat and, con tion will become apparent as the following de- sequently, provides an evaporator which will cool scription proceeds, and the features of novelty the surrounding air more lrapidly and will also which characterize my invention will be point- provide for rapid freezing of water, desserts and zo ed out with partioularity in the ciaims annexed to the like. I attain these advantages by construct- 20 and forming a part of this specification. ing the evaporator of two sheets of metal having For a better understanding of my invention, indentations formed therein to provide a header reference may be had to the accompanying draw- and a plurality of depending U-shaped refrig ing in which Fig. 1 shows a household refrigerator 25 utilizing an evaporator embodying my invention; Fig. 2 is an enlarged perspective view of the evaporator shown in Fig. 1; and Fig. 3 is a plan view of the sheet metal portions of the evaporator shown in Fig. 1 prior to bending. so Referring now to the drawing, in Fig. 1 I have shown a household refrigerator comprising a erant circulating passages or conduits and an ar-- rangement whereby the refrigerant supplied to 25 the evaporator is utilized to produce a positive circulation of liquid refrigerant to the header and a recirculation from the header in a predeter mined direction. Portions of the U-shaped re frigerant passages are preferably arranged in 3o a horizontal plane to provide a surface for Sup- ' cabinet iu having a food compartment Il and a door I2 for closing the compartment. The compartment II is cooled by an evaporator or cooling 35 unit I3 arranged in the upper portion thereof and supplied with refrigerant from a refrigerating machine mounted on the top of the cabinet. The porting freezing trays which afford rapid freez ing 0f Water, desserts and the like. Referring 110W t0 Fig. 2, the evaporator I3 iS made of inner and outer sheet metal portions 22 35 and 23 respectively. The Sheets 22 and 23 are made of stainless steel or other suitable material refrigerating machine comprises a closed casing I4 in which is arranged a motor and a re40 frigerant compressor, an air cooled refrigerant condenser I5 comprising a conduit I6 and a float valve chamber I'I. During the operation of the motor and compressor within the casing I I and are provided With indentatìOnS 01’ Corruga tions forming the cylindrical header 20 adjacent the upper endS 0f the Sheets, a plurality 0f 40 gaseous refrigerant is compressed and discharged 45 into the conduit I6 of the condenser I5 where it is cooled by air circulating over the condenser due to the natural drafts, and is liquefied. The liquefied refrigerant then ñows through a connection I8 to the float valve chamber I'I. When 50 a. predetermined amount of liquid refrigerant has collected in the chamber I1 a float arranged therein rises and admits refrigerant to the evaporator I3 through a conduit I9. The liquid refrigerant is vaporized by the absorption of heat 55 from the chamber II , and the vapor collects in separate U-shaped depending conduits 25, a sinuous conduit 26, a mallìfOld 2l and a plurality of ducts 28 connected to the manifold 2l and the lower portions of the U-shaped passages 25. The upper ends of the U-shaped passages all com- 45 municate with the lower portions of the header 20 and are all arranged Substantially in 10I1gi tudinal allnement. The sheets 22 and 23 are bent to form side walls 29 and 30 and top and bottom Walls 3l and 32 respectively, providing 50 upper and lower surfaces Bla and 32a for sup porting freezing trays and the like. Depending U-shaped refrigerant circulating passages 25 ex tend downwardly from the header 20 within the side wall 29 and across the bottom wall 32, and 55 2 2,117,ee1 the sinuous conduit 26 extends in part across the top wall 3| and in part within the side wall 30. The sheets 22 and 23 are secured together- around their edges and between the indentations by welding, brazing or any other _suitable man ner; the front and rear edges of the sheet 22 being folded over the respective edges of the sheet 23 in the manner indicated at 24. A flange _33 formed on the sheet 22 at the end thereof remote 10 from the header 20 fits against the side wall 29 and is welded or otherwise »secured thereto. A metal sheet 34 is welded to the upper end of the side wall 30 and constitutes a side wall for an upper freezing chamber. The wall 29 and the 15 wall 3l are provided with flanges 35 and 36 re spectively, for securing the evaporator to a re movable top wall of a refrigerator cabinet. The ,general arrangement of the header and the passages within the wall of the evaporator is not 20 my invention but is the invention of Leonard W. Atchison, and is disclosed and claimed in his co pending application, Serial No. 51,846, ñled November 27, 1935, and assigned to General Elec tric Company, the assignee of my present inven 25 tion, I do not, therefore, herein claim any in vention claimed in the said Atchison application. Referring now to Figs. 2 and 3, liquid refrig erant is admitted to the evaporator I3 through the conduit I9 and enters a passage 31 formed 30 in the side wall 29 and the bottom wall 32. 'I‘he passage 31 communicates directly with the sinu ous passage 26 and the refrigerant therefore flows into the sinuous passage, circulates there through and ñows to the manifold 21. 35 The ducts 28 which convey the refrigerant uniformly from the manifold 21 to the several U-shaped passages 25 are arranged .in such manner as to induce a positive circulation of 40 45 50 55 liquid refrigerant in a predetermined direction through each of the U-shaped passages. In order to accomplish this mode of circulation each of the ducts 28 is arranged to inject refrigerant directly and longitudinally into one leg of a U-shaped passage, to produce a flow through that leg of the passage and upwardly to the header 20. 'I'he resultant injector action pro duces a positive flow of liquid refrigerant through each of the U-shaped passages, liquid refriger ant recirculating from the header downwardly through the other leg of the passage; a rapid circulation and recirculation in all U-shaped passages is thereby provided. In order to mini mize the turbulence of the liquid refrigerant within the header 20 which results from the rapid circulation of refrigerant, I arrange the injectors 28 so that the same direction of flow of liquid refrigerant obtains in adjacent legs of adjacent U-shaped conduits. It is evident that when the refrigerant is thus caused to circulate 60 in the same direction in the pairs of adjacent legs of the U-shaped passages, there will be a less frequent reversal of the direction of flow of refrigerant along the header. If the direc tion of flow were made thev same in al1 the 65 U-shaped passages, each passage would have re frigerant flowing therein in a direction opposite the direction of flow in the adjacent passage and there would be increased turbulence and consequently increased resistance to the circu 70 lation of liquid refrigerant.- In the evaporator, as described above, there will be larger areas of upward and downward flow, since each, area will correspond to the portion of the header above two of the legs of the U-shaped passages. Dun'ng the operation of the evaporator de » - scribed above, refrigerant is admitted to the pas sage 31 from the passage I9 and ñows from the ' passage 31 through the sinuous conduit 26 and thence to the manifold 21. Some of the refrig erant flowing through the conduit 26 is -vapor ized by the absorption of heat from the air With in the chamber Il and from articles placed on ` the freezing shelf 31a; The vaporized and liquid refrigerant flows fromf the manifold 21 in sub stantially equal amounts through the ducts 23 and into the several U-shaped passages 25. Since each of the ducts 28 directs refrigerant upwardly into only one leg of the U-shaped passage with which it communicates, the direc tion of flow of refrigerant in each U-shaped 15 passage is definitely predetermined and minimum turbulence of liquid ~refrigerant in the header is assured at all times. Liquid refrigerant vapor ized within the passages 25 by the absorption of heat from articles resting on the shelf 32a and from the air within the chamber Il, collects in the header and is withdrawn therefrom through suction conduit 2l. It will be apparent from the foregoing that I have provided a flooded evaporator of simple 25 construction having an improved arrangement for predetermining the direction of ñow of re frigerant in the circulating passages thereof and for assuring a minimum of turbulence and, therefore, a minimum resistance to circulation 30 of the liquid refrigerant. While I have described my invention in con nection with a household refrigerator, other ap plications will readily be apparent to those skilled in the art. Ido not, therefore, desire my in 35 vention to be limited to the particular construc tion shown and described, and I intend in the appended _claims to cover all modifications with in the spirit and scope of my invention. What I claim as new and desire to secure 40 by Letters Patent of the United States is: 1. A flooded evaporator for refrigerating ma chines comprising a header and a plurality of separate depending U-shaped refrigerant circu lating passages, both of the ends of each of 45 said passages communicating with said header and all of the ends of said passages being sub stantially in longitudinal alinement along said header, means including a plurality of ducts one communicating with the lower portion of each of said U-shaped passages and injecting liquid 50 refrigerant longitudinally into said U-shaped passages for producing a circulation of liquid refrigerant toward said header in one leg of each of said passages and away from said header in the other leg of each of said passages and for determining the direction of circulation of liquid refrigerant in each of said passages, and means for withdrawing gaseous refrigerant from said header. 60 2. A flooded evaporator for refrigerating ma chines comprising a header and a plurality of separate depending U-shaped refrigerant circu lating passages, both of the ends of each of said U-shaped passages communicating with said 65 header and all of the ends of said U-shaped pas sages being substantially in longitudinal aline ment along said header, means including a plu rality of ducts of relatively small cross-sectional area as compared with the cross-sectional area 70 of said passages and injecting liquid refrigerant longitudinally into one leg of each of said pas sages for producing a circulation of liquid re frigerant toward said header through said one leg and away from said header in the other of 75 2,117,861 3 said legs, and means for withdrawing gaseous refrigerant from said header. 3. A flooded evaporator for refrigerating ma lation of liquid refrigerant toward said header chines comprising a header and a plurality of tion of circulation of liquid refrigerant in each of said passages, said circulation producing means being arranged to circulate the liquid refrigerant in the same direction in adjacent separate depending U-shaped refrigerant circu lating passages, both of the ends of each of said passages communicating with said header and all of the ends of said passages being substan tially in longitudinal alinement along said header, means communicating with the lower portion of each of said U-shaped passages and injecting liquid refrigerant longitudinally into said U-shaped passages for producing a circu in one of the legs of each of said passages and away from said header in the other leg of each of said passages and for determining the direc legs of adjacent ones of said U-shaped passages, and means for withdrawing gaseous refrigerant 10 from said header. CHRIS'I'IAN S'I'EENS'I'RUP.