US2481556A - Evaporator structure - Google Patents

Description

Vitto neg W. M. WOHL EVAPORATOR STRUCTURE Filed Oct. 17, 1945 ,gangers/or I "111111111111111111111', ""Ava'ra'a'l'lA m, v 'lll'.

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Fig. 3 is an elevational view of one of the evapilaiented Sept. 13, 1949 EVAPORATOR STRUCTURE Waldemar M. Wohl, Cleveland, Ohio, assignor to The Yoder Company, Cleveland, Ohio, a corporation of Ohio Application October 17, 1945, Serial No. 622,821

3 Claims. (Cl. 62-126) This invention relates to refrigeration apparatus of the cabinet type in which is mounted one or more evaporators to which is supplied a volatile liquid refrigerant to provide a relatively low temperature, whereby edibles and beverages may be stored in the cabinet to prevent or retard deterioration thereof.

My improvement relates more particularly to an evaporator of the plate type, wherein the refrigerant supply connection leads into the lower end of the evaporator and the vapor discharge connection leads from the upper end thereof. As it is desirable to arrange the evaporator in close relation to the walls of the storing compartment idiiculty arises in installing the supply pipe for the refrigerant and discharge pipe for the vapor so that the cabinet wall has to be provided with an opening to permit access to these connections and in many instances the cabinet has to be so positioned, when installed, that access to these connections require bodily movement of the cabinet.

One object of the invention therefore is to provide an improved evaporator wherein these objections are eliminated.

Another object of the invention is to provide in apparatus of this character an improved evaporator having both the outlet and inlet connection .at its upper end and provision is made for circulating the refrigerant over the entire interior area of theevaporator.

Another object of the invention is to provide in apparatus of this character an improved evaporator having supply and discharge connections arranged to simplify and reduce the cost of the construction and to facilitate servicing of the evaporator when installed in a cabinet from time to time.

Other objects of the invention will be apparent to those skilled in the art to which my invention relates from the following description taken in connection with the accompanying drawing,

wherein orators, parts being broken away.

In the drawings, I indicates as anentirety a cabinet of any desired size and construction, the walls of the cabinet forming a compartment 2 and insulated in a well known manner. Preferably the inner walls of the cabinet are lined with sheet metal la. and its exterior Walls are provided with a suitable facing material lb; the lining and facing materials may be utilized to protect the insulation material ic against deterioration and damage. The top wall of the cabinet is formed with openings Id, the top wall and openings being preferably surfaced with thin non-corrosive material Id. 3 indicates the lids for the openings Id, each lid being provided on the lower side of its marginal portion with a non-metallic material 4 to eliminate metal-to-metal contact with the cabinet walls, when the lids 3 areV in closed position, as shown in Fig'. 2.

5, 5, indicate two evaporators each positioned adjacent and parallelto one inner wall of the compartment 2 and removably supported on suitable standards I c. The evaporators are preferably related to opposed inner walls and co-extensive in length to those opposed walls of the compartment which are longer than any of the remaining walls thereof. Each evaporator 5 consists of two relatively thin metallic sheets 5a, 5b, the marginal portions of which are welded to'- gether face-to-face as shown at 5c. One of the metal sheets (preferably that sheetsheet 5bopposed to the inner wall of the compartment when the evaporator is installed therein) is embossed along its upper end within the welded portion 5c and adjacent thereto outwardly to form a conduit E, which extends from end to end of the evaporator, the embossment terminating at one end adjacent the welded portion 5c, but provided at its opposite end with a nipple 6a connected in a well known manner to a discharge pipe 6b, leading to a suitable compressor (not shown) Below the conduit 6 and throughout the area of the sheet 5b (within the welded portions 5c) the latter is provided with inwardly extending spaced embossments 1, which are elongated yin a direction at right angles to the flow of the refrigerant and arranged in horizontal and vertical rows, thereby forming connected vertical and horizontal channels 1a, 1b, respectively, between them, the lower row of horizontal embossments 1 forming a flow channel 5d between them' and the ad- K jacent welded portion 5c in connected relation to certain of the vertical channels 1a between these 'channels 1b and thecouduit. the sheets la, Ib,

are welded together;i'ace-to-face4 as shown at 5e, except that at spaced intermediate positions the sheet 5b is embossed outwardly, as shown at 8, to provide ducts leading from the channel 5:1: betweenthe upper row of embossments 1 and the welded portion 5e to the conduit 6 for the discharge of vapor into the latter. \9 indicates ja 'la related to the spaces between the baiiles 9 are prevented from owing directly into these ducts, but is forced to flow through the channels 1a, 1b, above the bailles, whereby any liquid refrigerant escaping past thebailles l may be completely vaporized, to avoid discharge of liquid refrigerant intothe conduit i and return thereof to the coinpressor. g

I indicates a supply inlet connection for the liquid refrigerant connected by a suitable nipple to a pipe Illa leading from a source of supply. As shown, the inlet connection I0 is arranged adjacent to but below'the nipple 6a, whereby ready access to both the nipple connections results. The discharge pipe 6b and supply pipe Illa extend throughthe adjacent wall lb, the insulation Ic and an opening la: formed in the vlin/ing or wall la for connection with the nipple 6a and inlet connection Il, respectively, the pipe 10a being provided with a suitable expansion valve lllb. The opening- Ir is closed by a cover l0c, which is removably held in place by screws,r to hold .the insulation material surrounding vthe pipes 6b and Ilia -in place. `The. cover permitsv access to the valve-10b.

For the purpose of supplying the liquid enter,- ing the inlet lczonnection Il to the adjacent end of the chan'el 5d, Iclose the channel 1a between the outermost vertical row of embossments 1 and the adjacent vertical row thereof, so that the closed channel 1a between the outermost row of embossments 1 and the adjacent welded portion c forms a conduit 1a' to direct the liquid refrig-` erant to the ow channel 5d. The closure for this channel 1a may: consist of a rod vIl having a diameter equal tothe space between the sheet 5a and crown of the channel. The rod ll I extends from the upper welded portion 5e downwardly to the channel 1b formed between the lowermost horizontal row of embossments 1 and the adjacent horizontal row thereof.

a point remote therefrom, so that that portion of the liquid remaining in the channel 5d may freely flow into the channels 1a, 1b.

4From the foregoing description it will be observed that the construction of the cabinet walls is simplified and ready access to the inlet and discharge connections is provided for to facilitate servicing and that the refrigerautkis delivered toy the lower end of each evaporator and distributed therealong for circulation upwardly, whereby the resulting vapor may be readily drawn from the evaporator. f

To those skilled lin the art to which my invention relates, many changes .in construction and widely differing embodiments and applications of the invention will suggest themselves without departing from the spirit and scope of the inven; tion. My disclosures and the description herein .are purely illustrative and are not intended to be in any sense limiting.

, What I claim is:

1. An evaporator for a volatile refrigerant con.

sisting of relatively thin metallic sheets secured together along their marginal edges, one of said sheets being embossed outwardly parallel and ad` laterally parallel and adjacent to the lower con-v nectedtogether marginal edges of said sheets to form a now channel therebetween, a device bet tween said sheets parallelly spaced from that end of the evaporator adjacent said outlet and extending from the upper connected-together marginal edges to the adjacent end of said ilow channel to, form a supply channel for the latter, an inlet for liquid refrigerant connected to said supply channel, one of said sheets throughout the Y, area betweensaid conduit and said ow channel, A

. said device and the'connected-together marginal tween them horizontal Aand vertical circulationl channels for the liquid refrigerant, and spaced portions of said sheets elongated parallel to said y conduit and between said conduit and the upper l2 indicates elements related to the channe1` 5d for distributing the liquid' supplied to channel 5d to different portions of the evaporator, whereby it may circulate through the channels 1a, 1b, over the entire evaporator area to insure hig t heat absorption eiliciency.

The distributing elements l! are preferably disposed in the channel'1b formed between the lowermost horizontal row rof embossments 1 and the adjacent row thereof and may consist of rods the diameter of which is equal to the space be-f tween the sheet 5a and crown of the vadjacent channel. The distributing elements -are rela-1 .tively spaced to form between their related ends;

outlets 12a for the liquid refrigerant, the outer end of the element I2 adjacent to the closure II being secured thereto and the element I2 at the opposite end of the evaporator 5 terminating at horizontal row of embossments being secured together to form outlet ducts leading from saidv vertical circulation channels to said conduit.

v 2. An evaporator as claimed in claim 1 wherein are provided spaced distributing devices disposed parallel to said flow channel and between said flow channel and the lower ends of said vertical circulation channels.

3. An evaporator as claimed in claim 1, wherein spaced bailles are disposed parallel to and spaced from said secured together portions, the spaces `between said baiiles being out of alinement with said outlet ducts.

, WALDEMAR M. WO1-1L.

REFERENCES CITED file of this patent: t

UNITED' STATES PATENTS Beane May 23, 1944 The following references are of record in the

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