US2658359A

US2658359A - Evaporator

Info

Publication number: US2658359A
Application number: US76990A
Authority: US
Inventors: Roland H Money
Original assignee: ARTKRAFT Manufacturing CORP
Current assignee: ARTKRAFT Manufacturing CORP
Priority date: 1949-02-17
Filing date: 1949-02-17
Publication date: 1953-11-10
Anticipated expiration: 1970-11-10

Description

Nov. 10, 1953 R. H. MONEY 2,658,35

EVAPORATOR Filed Feb. 17, 1949 2 Sheets-Shet 1 INVENTOR.

l2oland H. Money R. H. MONEY EVAPORATOR Nov. 10, 1953 2 Sheets-Sheet 2 Filed Feb. 17, 1949 Fig. 5

INVENTOR. Qoland H. Money BY I m MQLM [/3 Affomey Patented Nov. 10, 1953 EVAPORATOR Roland H. Money, Mount Healthy, Ohio, assignor to Artkraft Manufacturing Corporation, Lima, Ohio, a corporation of Ohio Application February 17,1949, Serial No. 76,990

The present invention relates to evaporators for refrigerating systems and more particularly to evaporators comprising a single duct, that is, a duct having a plurality of runs, all of which are connected in series circuit relation.

In evaporators of that type and particularly when the evaporator is formed into a cooling unit such as the standard U-shaped cooling unit, uneven defrosting of the evaporator occurs during the off phase of the cycle of operation of the refrigerating system because vaporizable refrigerant is exhausted in a large part of the duct first to receive the vaporizable refrigerant. This defrosting causes a flow of water and a refreezing of the water, at the lower part of the evaporator whereby an excessive amount of ice is built up along the bottom of one side of the evaporator and this ice functions as an insulator to impair the efficiency of the refrigerating system.

One of the objects of the present invention is to provide a reservoir for liquid refrigerant for the refrigerating duct of the evaporator and through which all refrigerant passes before it enters the duct, and to connect the inlet end of the duct with the reservoir above the bottom wall of the reservoir so that during the off phase of this cycle, liquid in the form of heavy vapor and foam of a mixture of oil and vaporizable refrigerant will be supplied to the duct whereby the upper part or inlet end of the duct is maintained colder during said 01f phase.

Another object of the present invention is to dispose a water absorbent in the inlet reservoir for the purpose of absorbing any water or moisture in the system which may have been admitted during the assembling of the system or which may inadvertently leak into the system.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred form of embodiment of the invention is clearly shown.

in the drawings:

Fig. 1 is a front view of the improved evaporator;

Fig. 2 is a side view looking in the direction of arrow 2 of Fig. 1;

Fig. 3 is a side view looking in the direction of arrow 3 in Fig. 1;

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3; and

Fig. 5 is a view taken on line 5-5 of Fig. 1.

Referring to the drawings, the evaporator comprises two sheets of metal 2| and 22. These Walls are bent to form

uprights

23 and 24 which 2 Claims. (Cl. 62126) are connected by a bottom wall 25 and these walls provide a cooling or freezing compartment 21. If desirable, a refrigerated shelf 28 may be suitably secured between the uprights 23 and .24.

The sheets 2| and 22 are provided with bulged portions at the upper end of each of

uprights

23 and 24. The bulged portion 30 of sheet 2| complements the bulged portion 3| of sheet 22 and the bulged portion 33 of sheet 2| complements the bulged portion 34 of sheet 22. The bulged portions 30 and 3| cooperate to form an outlet reservoir 35 and the bulged

portions

33 and 34 cooperate to provide an inlet reservoir 36. A serpentine shaped bulge 31 is formed in the outer sheet 22 comprising a plurality of vertically extending runs 38, in the vertically extending portion of the sheet, and horizontally extending runs 39, in the bottom wall of said sheet. The serpentine bulge 31 includes the elbow portions 4| in the vertically extending portion of each sheet. Sheet 2| is suitably secured, as by welding or hydrogen brazing, with sheet '22 along the edges of the sheet and also preferably about the bulge 31. The bulge 31 and sheet 2| cooperate to form a serpentine shaped passage. The outlet end 42 of the serpentine passage is connected with the reservoir 35 by an inwardly bulged portion 43 on the inner sheet 2|. The inner bulged portion 30 of sheet 2| is connected to a tube 45 by a coupling 46. The tube 45 in turn is connected in the low pressure side of a refrigerating system. Reservoir 35 provides ample space for the gasifying of any liquid and heavy vapor which passes thereto from the serpentine passage 31 whereby only gaseous refrigerant is delivered to the compressor of the system.

The inlet end 48 for the serpentine passage 38 is connected to the upper portion of the reservoir 36. The lower portion of the bulge 33' stops short of the inlet connection 48 so as to provide a dam 5|! whereby the liquid refrigerant is maintained at the level indicated.

A drier or water absorbent such as silica gel is contained in a cartridge such as the screen bag 5| and this bag is disposed within the reservoir 36. Water which accidentally enters the system, will be absorbed by the absorbent.

The shelf 28 may be formed of two pieces of metal and formed with a serpentine passage in the same manner as described in connection with the serpentine passage in the U-shaped evaporator. Liquid refrigerant is delivered to the shelf through a pressure reducing element connected between the condenser and the evaporator such as a capillary tube 52. The refrigerant 3 after passing through the passage in the shelf, is conducted by a tube 53 to the reservoir 36, there being a coupling 54 provided for connecting the tube 53 with the reservoir 36.

At the end of the on phase of the refrigerating cycle, a quantity of liquid refrigerant will be contained in the reservoir to substantially the height indicated. During the "08 phase of the cycle, the stored refrigerant in the reservoir 36 will boil and heavy vapor or refrigerant and oil in the form of foam will be fed to the inlet of the evaporator and this will continue until the supply within the reservoir 36 is exhausted. The reservoir 36 is of sufliclent size so. that during substantially the entire off phase of the cycle of refrigeration, some refrigerant will be fed to the evaporator whereby cooling continues and thus minimizes the uneven melting of the frost on the evaporator.

While the form of embodiment of the present invention as herein disclosed constitutes a preferrcd form, it is to be understood that other forms might be adopted, all coming within the scope. of the claims which follow.

I claim:

1. A U-shaped evaporator for a refrigerating system including walls forming a U-shaped cooling chamber and a continuous serpentine duct having a plurality of series connected runs on each of the upright and bottom walls, said runs each having a portion extending vertically of the upright walls and transversely across said bottom wall, a supply reservoir for supplying refrigerant to the duct, said reservoir being horizontally disposed adjacent the upper end of one of said upright walls and above the duct and said duct being connected with the reservoir above the '4 bottom of the reservoir; and a water absorbent disposed in the evaporator, said water absorbent comprising a quantity of silica gel and being disposed exclusively in said supply reservoir.

2. A U-shaped evaporator for a refrigerating system including walls forming a U-shaped cooling chamber and a continuous duct having a plurality of vertically disposed runs on each 01' the two upright walls and a plurality of horizontal runs on the bottom wall, said plurality of horizontal runs each being connected in series between the vertical runs on the two upright walls and said vertical runs on each upright wall being connected in series at their upper ends, a. supply reservoir for supplying refrigerant to the duct, said raervoir being horizontally diaposed adjacent the upper end of one of said upright walls and above the duct and said duct being connected with the reservoir above the bottom of the reservoir; and a water absorbent disposed in the evaporator, said water absorbent comprising a quantity of silica gel and being dis: posed exclusively in said supply reservoir.

ROLAND H. MONEY.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 1,809,833 Davenport June 16, 1931 2,143,171 Anderson Jan. 10. 19.30 2,217,257 Money Oct. 8, 1940 2,266,983 Money Dee. 23,.1841 2,306,772 Benson Dec, 29, 1952 2, 71,215 Benson Mar. 13, 19 2,430,692 Touborg Nova 21, mm