US2072423A - Refrigerating apparatus - Google Patents

Description

March 2, 1937;

E. J. DILLMAN REFRIGERATING APPARATUS Original Filed June 1'7, 1930 news {1 n 2 Shee'ts-Shget 1 INVENTOR 4a,; ATTORNEY March 2, 1937. E. J. DlLLMAN REFRIGERATING APPARATUS 2 Sheets-Sheet 2 Original Filed June 17, 1930 INVENTOR & 0% m BY @6014 A7 na fie; ATTORNEY llllllllll Patented Mar. 2, 1937 REFRIGERATING APPARATU Earnest J. Dillman, Detroit, Mich., assignor to Detroit Lubricator Company, Detroit, Mich, a corporation of Michigan Original application June 17, 1930, Serial No. 461,669. Divided and this application July 30, 1934, Serial No. 737,526

22 Claims.

My invention relates to new and useful improvements in control devices, and more particularly to a device or apparatus having one or more means for automatically regulating or controlling one or more control devices in response to predetermined conditions or changes of conditions, such that certain mechanism or apparatus in connection with which the control device or devices is or are employed, will be controlled or regulated in a desired manner. While it is evident that the control apparatus of my invention is capable of use with or embodiment in a multiplicity of different systems or apparatus, I have chosen, for the purpose of these specifications, to disclose the same in cooperable relation with a refrigerating system or apparatus, preferably of the absorption type, the cycle of operation -of which is well known in the art.

The ,invention consists in the improved construction and combination of parts and their aggroupment in operative relation, all to be more fully described hereinafter, and the novelty of which will be particularly pointed out and distinctly claimed.

In the accompanying drawings, to be taken as a part of these specifications, I have fully and clearly illustrated a preferred embodiment of my invention, in which drawings:

Figure 1 is a view in front elevation, partly 30 diagrammatic, having certain parts broken away,

and being partly in vertical section, .of an apparatus embodying my invention;

Fig. 2 is an enlarged detail view, partly in vertical central section, of my control device shown 35 in Fig. 1, but with the cover or closure member thereof removed;

Fig. 3 is an enlarged detail view in vertical section, of part of the control device, and

Fig. 4-is an enlarged detail view of a part of 40 an element of the control device.

Referring to the drawings by characters of ref-- and 5, 5*, respectively, which are preferably at the sides of the member I and'extend com- 55 pletely from front to rear thereof. The interior In the top and bottom walls are,

of member I is preferably divided into vertical flow passages 6, I and 8 by partitions, or the like, 9, H) which terminate short of the top and bottom walls, and which are in the respective planes of the substantially alined openings 4, 5 and 4 5--. Control means H, such as dampers, flap valves, or the like, are provided for each of the openings 4, 4 and 5, 5, which, when in position, cooperate with the partitions to close the passages 6 and 8, and which when in closed position provide for circulation from passage I to passages 6 and 8 and then back to passage 7, as is apparent from Fig. 1. The means H are preferably carried by rotatable shafts journaled in the member I and having any suitable interconnecting linkage l2, whereby the means .H are movable in unison to open and to closed positions. Within-the passage I is a sealed container means i3, which preferably comprises a plurality of vertically positioned steel tubes having headers, or the like, M at top and bottom, the top header alone being shown, and which contains or is adapted to' contain an absorbent or adsorbent medium, such, for example, as silica gel, or the like, designated l5. Sealed to and extending from the top header I4 is a conduit member l6 serving as a common delivery and return duct. In the bottom wall 3 is an aperture I1 positioned beneath means l3 for admission to the interior ofmembe'r l of a heating means l8,

preferably a gas or other fluid fuel main burner means supplied from any suitable source by a conduit member [9 having therein a flow control device or valve means 20, to be further described.

The burner means I8 is preferably provided with a pilot burner 2| fed through a valve controlled conduit member 22 connected to member IS on thesupply side of means 20. Supported by the top wall 2'is a drive means 2|, preferably an electric motor, having its drive shaft 23 vertically positioned and extending at its lower end through the wall 2 into passage fl. On the top and bottom ends of the shaft 23 are secured fan means 24, 25, respectively, for creating a forced gas flow. A vent pipe 26 opening from passage 8 to atmosphere is preferably provided.

Supported on top of the casing member I is the condenser B, preferably of the air cooled type, which is positioned directly over the fan means 24 and which is mounted on a housing 2'! for the fan means 24. The housing 21 has inlet openings 2! at front and rear below the means 24, so that cooling air or gases will be drawn into the housing by the means 24 and forced up through and over the condenser B. Extending from the top inlet end of the condenser B is a conduit member 28 which connects into a valve casing 29 and through a check valve 38 therein to the conduit member IS, the valve 38 opening toward the condenser B.

From the lower outlet end of the condenser B extends a conduit member 3| in which is a check valve 3| closing toward the condenser B and which leads to the flow control means D. Positioned in the conduit member 3| is the refrigerant medium receiver C. The means D is preferably a float valve such, for example, as that disclosed and claimed in the patent to Lewis W. Eggleston, No. 1,832, 93, granted November 17, 1931.

From the means D leads a conduit member 32 to the evaporator E, from which passes a conduit member 33 to the valve casing 29 and through a check valve 34 therein to the conduit member Hi, the valve 34 opening toward the member Hi. The refrigerant medium which passes through conduit members I6, 28 and 33 is substantially in the vapor state, and these members are therefore preferably of larger diameter bore than members 3| and 32 which convey the medium in liquid state.

Mounted on brackets, or the like, on the front wall of member I, is the control device F, which preferably has a substantially rectangular supporting framework 34 having top and bottom frame members 35, 36 and end frame members 31, 38. Rigidly secured in an aperture in the bottom member 36 and depending therefrom, is the valve means 20 having a port 39 with which cooperates a reciprocable valve member 48 carried by a stem 4| having a sliding fit in and extending up through a guide aperture in the valve bonnet 42. Between and secured to the top and bottom members 35, 36 is a substantially vertical supporting frame member 43 having a horizontal guide aperture 44 therethrough adjacent its midportion. Extending through the aperture 44 is a.reciprocable thrust member or plunger 45 carrying thereon a slidable sleeve member 46, preferably of brass, having guided bearing in the aperture 44. Intermediate its ends the plunger 45 is screw threaded and adjustably carries an operating nut or trip member 41 for a purpose to be described, and which also serves to limit movement of said sleeve member 46 in one direction. Movement of member 46 in the opposite direction is limited by a collar or stop member 48 rigid with plunger 45, and preferably seated in a circumferential groove therein. Movable relative to member 46' and carried thereby is an abutment .or operating member 49, preferably an annulus of hardened tool steel having sharp, marginal edges on its inner circumference, as at 50, 5| (see Fig. 3). The member 49 is of slightly larger internal diameter than the external diameter of member 46, so that when tilted from a plane substantialy normal to the longitudinal axis of plunger 45, the edges 59, 5| of member 49 will bite into member 46 and cause member 49 to move positively therewith. Normally acting on the member 49 is a resilient means 52 tending to slide member 49 along member 46 from left to.

right of Figs. 2 and 3 and toward frame member 38. The means 52 is preferably a leaf spring member fixed, as at 58, to frame member 43 and bifurcated at its upper free end so as to pass to each side of member 46 and engage abutment member 49 at opposite points adjacent its horizontal. diameter. Extending rigidly from frame member 43 toward frame member 38 below and substantially equidistant laterally from member 46, are supporting arm members 54 having a substantially horizontal bearing pin-oryrod member 55 extending rigidly therebetween. Pivotally supported on pin 55. is a lever memberor means 56 extending toward frame member 38 and having substantially. parallel, horizontally spaced rigidly connected arm portions 51, 58 through which are alined bearing apertures 59 receiving the pin- 55. Connecting the portions 51, 58 is a transverse or base portion 60 from the top and bottom edges of which members 6|, 62, respectively, extend toward frame member 38 in substantially parallel relation. The members 6|, 62 extend through an aperture 63 in a substantially vertical bracket member 64. The bottom edge 65 of aperture 63 cooperates with member 62 tolimit or stop downward movement of means 56. The arm portions 51, 58 are joined above pin 5 by a pin or rod 66 which is positioned just under sleeve member 46 and for engagement by the abutment member 49 upon its movement from left to right of Figs. 2 and 3. At its top the bracket member 64 has a lateral extension or arm 61 which overlies'the member 6| and through which is adjustably threaded a stop screw 68 cooperable with member 6| for regulating and limiting the'permissible upward movement of means 56. Extending in prolongation of and substantially horizontally from the top of arm portion 51, is an operating arm or member 69 which passes through an aperture 10 in end frame member 38, and has pivotally secured on its free end, as at an adjustable link or rod 12 which connects to the damper operating linkage I2, and preferably to one of the inlet opening damper shafts. Also fulcrumed on pin 55 between arm portions 5T, 58, is a lever or lifting member 13, preferably comprising substantially parallel rigidly connected arms 14 of substantially triangular form, having their bases preferably substantially vertical and their apices apertured to receive the pin or shaft 55. The upper ends of arms 14 extend on opposite sides of plunger 45 and in proximity thereto, and terminate in fingers or trip members 15 substantially at or above the contact points between leaf spring 52 and member 49 for en-q gagement with the abutment member 49 to disengage the same from biting engagement with sleeve member 46. The member 13 also acts upon upward counterclockwise movement about pin 55 to engage pin 66 subsequent to engagement of fingers l5 and members 49 to left or rotate lever means 56 counterclockwise of Fig. 2. In opposing relation to the stop member 62 which extends beyond member 6|, is a substantially horizontal lever member 16 which extends over the valve stem 4| and freely through an aperture 11 in frame member 38. The member I6 is provided with knife-edge fulcrum portions 18 which engage the inside face of member 38. Interconnecting and pivoted to the member 16 and stem 4| is a link, or the like, 19 which serves to transmit motion from member 16 to the valve member 49. The members 62 and terminate in conical points 88, 8|, respectively, which seat in bearing recesses in spring follower members 82, 83 between which and held under compression thereby the toggle joint will be broken upward slightly.

Rigidly supported on the lever member 18 and extending at an inclination upward therefrom, is an abutment arm 85. Secured to and depending from the top frame member 35 are supporting arms 86 between which is fulcrumed, on a hearing pin 81, a lever member 88, which extends over the abutment arm 85 and from which depends a rod member 88 cooperable with arm 85 to depress the same. Positioned between members 35 and 88 is a coil spring, or the like, 88 under compression and normally tending to force member 89 into engagement with arm 85 to close valve 28. The spring 88 is opposed and normally held inactive by pilot burner responsive means 9I which has a bulb element 92, see Fig.

1, charged with a heat responsive medium and positioned to be heated by the flame of pilot burner 2|. Extending from element 92 is a conduit 93 which connects into casing 94 secured to the top frame member 35 above lever member 88 and on the opposite side of its fulcrum from spring 98. The casing 94 is sealed by resilient means (not shown), such as a metal bellows, which carries a plunger 85 engaging the lever member88 on the opposite side of its fulcrum from spring 88 so that the presence of a proper pilot burner flame will maintain member 89 in the position of Fig. 2. Pivotally secured between the lifting member arms 14 at their lower ends and on a pin 88, is a depending plunger 91 extending through a spring adjustment nut 98 and an aperture in the bottom frame member 38. Fixed to the underside of member 38 is the power element 98 of a means responsive to variation in a fluid characteristic, preferably temperature,

and whch comprises a casing I88 sealed by resilient means 585, preferably a metal bellows, having fixed thereto a plunger I82 operatively connected to plunger 91. Within the bellows I8I around plunger I82, is a coil spring, or the like,

' I83 under compression and which seats against the bellows head and the nut 98, and by which the response of the responsive means may be regulated. Leading from the chamber I84 withi in the casing I88, is a conduit I having sealed to its free end a bulb element, or the like, I85 charged with a suitable expansive medium and positioned within the generator-absorber passage 1, so that upon occurrence of a predetermined temperature or variation in temperature of the heating gases in passage 1, the element 99 will be actuated to force the plunger 91 and lifting member 13 upward. Secured to the end frame member 31 is a power element I86 having a casing I81 within which is a plunger I88 in substantial alinement with plunger 45 and operatively connected thereto. The plunger I88 is carried by resilient means I89, preferably a metal bellows, which seals the casing I81. Within the bellows I89 is a coil spring II8 under compression and surrounding plunger I88 and seating against the head of bellows I89. At its other end the spring I I8 abuts an externally threaded apertured nut III which is adjustably screwed into the frame member 31. The element I86 comprisespart of a means responsive to variation in a fluid characteristic, preferably pressure, and has a conduit II2 connecting the chamber II3 within the casing I81 to the refrigerant medium return conduit member 33. Positioned on the top of the top frame member 35 is an electric switch means H4, preferably ofthe enclosed contact tilting mercury tube type having terminals H5, H6 extending through the wall of the tube In and from which lead conductors H8, 8- to the fan motor 2|. The switch tube H1 is held in a clip member I28 which is pivotally supported on a pin I2I carried by a bracket I22 to permit rocking or tilting movement of the tube to flow the mercury to and from the contacts. The tube H1 is counterweighted by a member I23 which tends to maintain the motor'circuit closed. Projecting from the clip member I28 is 9. lug I24 in the path of movement of one end of a lever ,arm I25 which passes downward through an aperture I26 in the top frame member 35, and which is fulcrumed intermediate its ends on a bracket sup ported pin I21. The other end of arm I25 extends to the left of and into cooperable relation with the plunger carried trip member 41, so that movement of plunger 45 from right to left of Figs. 2 and 3 acts to break the circuit of motor 2| within tube H1.

The operation of my control device or apparatus as embodied, for example, in a refrigerating system of the absorption type, will now be described, it being understood that the control device is capable of embodiment in other systems and for controlling other means. In the drawings, the positions of the various elements ofthe system are such as occur on the completion of a heating cycle, and after the generator-absorber- A has been cooled somewhat. Continuing from this point in a cycle of operation, the functioning of the system under command of my control device is asfollows: The heat given off from the container means in passage 1 will cause a natural upward flow of cooling gases or air in passage 1, which cooling air enters at inlet openings 5, 5 and leaves via outlet openings 4, 4, the damper means II being in the positions shown and the main burner I8 having-been extinguished. The temperature at the evaporator E will be above the predetermined low limit for which the power element I88 ,is set, and therefore pressure of the vaporized refrigerant medium, such, for example, as sulphur dioxide, in the conduit member 33 acting on the resilient chamber sealing means I88 will have moved the interconnected plungers I88 and 45 to the right of Figs. 2 and 3 at the start of the now completed heating cycle. The plunger 45 carries the nut or trip member 41 which on movement of plunger 45 to the right of Figs. 2 and 3 will have released switch tube 1, permittin the weight member I 23 to tilt the same clockwise on its pivot I2I to energize the fan motor 2I The fan 25 driven by motor 2I will create a forced upward draft through passage 1, increasing the rate of cooling of the generator absorber and container means I3. The cooling of the means I3 will reduce the pressure therein, cause ing the liquefied refrigerant medium in the evaporator E to vaporize and pass back through conduit member 33, the check valve 34 and conduit member, I6 to the container means I3, for absorption or adsorption by the medium I 5 therein. As the evaporator cools, due to the vaporization of the refrigerant medium, the pressure characteristic of the vaporized refrigerant medium or fluid in conduit 33 will decrease, thus decreasing therewith the pressure in power element chamber I I3, which under the'inherent resilience of sealing means I88 and spring II8 will.move trip member 41 to the left of Figs. 2 and 3. Upon attainment of substantially the desired low temperature at the evaporator, the trip member 41 acting through lever I25 will have tilted the tube II1 counter-- clockwise of Fig. 2, breaking the circuit to the fan motor 2I, and thus decreasing the rate of Y will be tilted back andforth to make and break the motor circuit during the cooling cycle in response to variation within predetermined limits in the fluid characteristic transmitted to power element chamber H3, but due to the relative permitted movement between plunger 45 and its sleeve 46, the plunger member 45 will not actuate the lever means 56. When the absorbing or adsorbing power of the medium I5 in container means I3 has been substantially satisfied, the pressure in conduit member 33 will continue to increase beyond the pressure necessary to start motor means 2!, and regardless of the increased flow by the fan 25 of cooling air which will now continue until .the evaporator is again cooled down as above described. The limiting stop or nut 41 will take up the play between plunger 45 and sleeve 46, causing the abutment or ring member 49 to engage the cross in or member 66. Continuation of the movement of plungers I08 and 45 to the right of Figs. 2 and 3- will cause the ring member 49, backed up by leaf spring 52, to tilt from the normal to plunger 45 into biting or gripping relation to sleeve 46, as in Figs. 2 and 3. When the ring member 49'has been tilted and tightly grips the sleeve 46, then movement of plunger 45 to the right will act through this established positive engagement with lever means 56 torotate or move the same clockwise about its pivot'pin 55, which will initiate the heatin period. As above noted, the break point 80 between means 56 and spring 84 is very slightly above and over-center, and therefore the movement of plunger 45 necessary to carry point 80 through center is very slight. As the point 60 .means 56 and arm 69 downward and clockwise about pin 55 into engagement with stop 65. The downward movement of point 60 carries it across the line of points BI, 18, so that thespring 84 will react with an upward component on the lever I6, swinging the'sameclockwise of Fig. 2 about its knife edge fulcrum I8. The upward movement of lever I6 is transmitted through link "I9 to valve stem 4| to open valve and permit fuel to flow to the main burner means I0. The fuel supplied to means I8 will be ignited by the pilot burner 2 I. Should it happen that the pilot bumer flame is insufficient to heat the bulb element 92, then the spring 90 will have acted through arm 85 to hold the valve member 40 on its port 39 against. the lifting component of force of spring 84, and thus prevent fiow of fuel to the burner means I8. It is of course understood that the bu'b element 92 and responsive means 9| comprise a safety device, which on failure, or substantial failure, of the 'pilot'burner flame will system. The downward movement of lever'arm 69, as above described, acts through the rod 12 and linkage I2 to operate the damper means II to close the inlet openings 5, 5* and the outlet openings 4, 4 The gases within casing member I-which are heated by means I0, will rise over the container means I3 and be forced by the running fan to travel down the passages 6 and 8 for continuous recirculation and heating. During the heating period, refrigerant medium in the vapor state will be driven off from the absorbent or adsorbent medium within container means I3, and will pass through top header I4 to conduit member I6. The check valve 34 will direct the flow through conduit member 20, past check valve thereto.

30, to the condenser B. The motor means 2|- which is constantly energized during the heating period, will also drive fan 24, which will force.

cooling air upward over the condenser B to cool and liquefy the refrigerant medium supplied The liquefied medium will pass through the valve controlled conduit member 3| to the evaporator E, any surplus being stored in the receiver C until permitted by theflow control means D to enter the evaporator E via the conduit member 32. When the recirculating gases within the housing member I have been heated to a predetermined degree, .say, about 400 F., substantially all of the refrigerant medium will have been driven oil from the absorbent or'ad- .sorbent medium I5 in container means I3 and have passed to the condenser B. Upon the temperature within the generator-absorber reaching the desired degree, the fluid within the bulb element I05 of the responsive means will have acted upon the resilient sealing means I M to force plungers I02 and 91 and the lifting member I3 upward. As the lifting member I3 moves upward, the upper inclined edges of the arms I4 will engage the underside of cross-pin 66 and lift lever means 56 upward, or counterclockwise, about its fulcrum 55' against the force of spring 84, until point 80 crosses center, when spring 80 will snap the'lever means 56 up against stop screw 68. During the latter part of the upward movement of lifting member 13, the fingers I5 thereof will engage the ring member 49 and turn it back to substantially vertical position as it fulcrums on the leaf spring 52, and will then slide or move it toward the left of Figs. 2 and 3 against the force of spring 52 and along sleeve 46, so that it will be out of the way of the cross-pin 66 and not stop or hinder upwar movement of lever means 56. The valve 20 will be snapped closed by the force of spring 84 as point 80 passes through the extended line of points 8|, I8, which operation starts the cooling period in the cycle. The damper arm 69, which is moved upward with lever means 56, acts through rod I2 and linkage I2 to operate the damper means II to open inlet openings 5, 5 and outlet openings 4, 4*, closing passages 6 and 6. The fan 25 will continue in operation, cooling the container means I3 and the atmosphere in passage I. As the temperature in passage 1 decreases, the fluid in bulb element I05 will contract, permitting "spring I03 in the power element 99 to move con- "completing a cycle of operation of the system and of the control device.

It may be noted that the spring 52 will return i the abutment member 49 to the right along sleeve 46 to its operative-location as the lifting means 13 and fingers 15 are retracted. It may also be noted that the cooperating sleeve 46 and annulus 49 permit a very sensitive operation as the annulus is operable to grip tightly the sleeve 46 anywhere within the length of the sleeve.

The above described cycle is descriptive of the normal operation of the control device and system. However, upon initial operation or starting of the system with the evaporator substantially at room temperature, there may be several cyclesduring which the motor means 2I will operate continuously, because the temperature of the evaporator E may not 'drop sufliciently in the first few cycles to'permit spring IIO to retract plunger 45 far enough to the left to tilt tube II! and break the motor circuit.

Although my control device and apparatus has been described as functioning in connection with a refrigerating apparatus employing silica gel as the absorbent or adsorbent medium and sulphur 5 dioxide as the refrigerant medium, it will be apparent that the refrigerating apparatus may utilize ammonia as the refrigerant medium and water as the absorbing medium.

This application is a divsion of my copending 10 application Serial No. 461,669 filed June 17, 1930.

What I claim and desire to secure by Letters Patent of the United States is:

1. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator 15 connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of 20 heating gases over said generator absorber,

means responsive to a condition in said generatorabsorber to actuate said control means to said one position, and means responsive to a condition in said evaporator to actuate said control means 25 to said other position.

2. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative 30 in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber,

means responsive to a condition in said generatorabsorber to actuate said control means to said one position, means responsive to a condition in said evaporator to actuate said control means to said other position, and means to create a forced flow of the cooling gases.

40 3. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases 45 over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one posi- 50 tion, means responsive to a condition in said evaporator to actuate said control means to said other position, and means to create a forced recirculation of the heating gases.

4. A refrigerating apparatus, comprising a gen- 55 erator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in an- 60 other position to establish recirculation of heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one position, means responsive to a condition in said 65 evaporator to actuate said control means to said other position, and means to create a forced flow of cooling gases and a forced recirculation of heating gases.

5. A refrigerating apparatus, comprising a gen- 70 orator-absorber, a condenser and an evap connected in operative relation, means to heat aid generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in 75 another position to establish r rculation of oearcn fiOC heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one position and to stop said heating means, and means responsive to a condition in said evaporator to actuate said control means to said other position.

6. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one position, and means responsive to a condition in said evaporator to actuate said control means to said other position and to start said heating means.

7. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one position, means responsive to a condition in said evaporator to actuate said control means to said other position, and means to create a forced flow of the cooling gases, said first-named responsive means controlling said last-named means whereby to regulate the temperature about said evaporator.

8. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means to cool said condenser, means responsive to a condition in said generator-absorber to actuate said control means to said one position, and means responsive to a condition in said evaporator to actuate said control means to said other position, said first-named responsive means controlling said condenser cooling means.

9. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, burner means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of' heating gases over said generatorabsorber, a pilot burner for said burner means, means responsive to substantial failure of said pilot burner to stop said heating means, means responsive to a condition in said generator-absorber to actuate said control means to said one position, and means responsive to a condition in said evaporator to actuate said control means to said other position.

101A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means responsive to a predetermined increase of temperature in said generator-absorber to actuate said control means to said one position, and means responsive to a condition in said evaporator to actuate said control means to said other position.

11. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, control means operative in one position to establish flow of cooling gases over said generator-absorber and operative in another position to establish recirculation of heating gases over said generator-absorber, means responsive to a condition in said generator-absorber to actuate said control means to said one position, and means responsive to a predetermined rise of pressure in said evaporator to actuate said control means to said other position.

12. A refrigerating apparatus, comprising a housing member having a longitudinally extending partition therein forming flow passages, sealed container means within one of the passages of said member and containing an adsorbent or absorbent medium and a refrigerant medium, said member having an inlet and an outlet, damper means for said inlet and said outlet and operable in one position to close said inlet and said outlet for circulation in said member and around said partition and operable in another position to open said inlet and said outlet for flow through said one passage to and from said housing, motor driven fan means in said one passage, an evaporator, a conduit connecting said container means and said evaporator and having fiow control means, a condenser in said conduit between said flow means and container means, a conduit connecting said evaporator and said first-named conduit between said container means and said condenser and having a check valve therein opening to said first-named conduit, a thermostat responsive to temperature in said one passage, burner means having a pilot burner and positioned in said one passage to heat said container means, valve means for said burner means, said thermostat being operable upon predetermined temperature to close said valve means and to move said damper means to said other position, and means responsive to pressure in said second-named conduit, said responsive means being operable at a predetermined low pressure to stop said motor means and at a predetermined high pressure to start said motor means, and being operable upon a predetermined higher pressure to open said valve means and to move said damper means to said one position.

13. In a refrigerating system, the combination with a main refrigerant circuit containing an aqueous solution of ammonia, and including a generator, a condenser, and an evaporator; of an electric fan adapted to cool said condenser; a switch adapted to control said fan; and thermostatically operative means adapted to operate said switch to start and stop said fan, in accordance with the temperature of the ammonia in said system.

14. In a refrigerating system, the combination with a refrigerant circuit containing a refrigerant medium, and including a generator, a condenser, and an evaporator, of an electric fan adapted'to cool said condenser, a switch. a pted to control said fan, and means to operate said switch to start and stop said fan in accordance with a characteristic of the refrigerant medium.

15. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation and containing a refrigerant medium, means to heat said generator-absorber, means to control said heating means, a fan operable to cool said condenser, drive means for said fan, means to control said drive means, and means responsive to a characteristic of said medium for actuating said firstnamed and said second-named control means.

16. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation-,-'means to heat said generator-absorber, damper means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said generatorabsorber, control means operable on movement in one direction to move said damper means to said one position and to stop said heating means and operable on movement in another direction to move said damper means to said other position and to start said heating means, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said control means whereby movement of said responsive means will act to move said control means in said other direction, means responsive to a condition in said generator-absorber, and means to transmit movement from said lastnamed responsive means to said control means to move said control means in said one direction.

17. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation means to heat said generator-absorber, da per means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said generatorabsorber, control means operable on movement in one direction to move said damper means to said one position and to stop said heating means and operable on movement in another direction to move said damper means to said other position and to start said heating means, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said control means whereby movement of said responsive means will act to move said control means in said other direction, means responsive to a condition in said generator-absorber, means to transmit movement from said last-named responsive means to said control means to move said control means in said one direction, means to cool said condenser, and means controlled by said first-named responsive means to control said cooling means.

18. A refrigerating apparatus, comprising a. generator-absorber, a condenser and an evaporator connected in operative relatio n', means to heat said generator-absorber, damper means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said generatorabsorber, control means operable on movement in one direction to move said damper means to said one position and to stop said heating means and operable on movement in another direction to move said damper means to said other position and to start said heating means, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said control means whereby movement of said responsive means will act to move said control means in said other direction, means responsive to a condition in said generator-absorber, means to transmit movement from said last-named responsive means to said control means to move said control means in said one direction, a fan operable to cause flow of cooling gases over said condenser, and means controlled by said first-named responsive means to control said fan.

19. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, damper means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said generator-absorber, control means operable on movement in one direction to move said damper means to said one position and to stop said heating means and operable on movement in another direction to move said damper means to said other position and to start said heating means, means responsive to a condition in said evaporator, a pair of members cooperable with said responsive means and said control means, one of said members having means movable thereon and normally establishing cooperable relation between said members whereby said responsive means can move said control means in said other direction, means responsive to a condition in said generator-absorber, and means to transmit movement from said last-named responsive means to said control means and to move said establishing means out of cooperable relation between said members, whereby said secondnamed responsive means is operable to move said control means in said one direction.

20. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, a fluid fuel burner to heat said generator-absorber, damper means movable into one position to establish flow of cooling gases over said generatorabsorber and movable into another position to establish recirculation of burner heating gases over said generator-absorber, a valve controlling flow of fuel to said burner, control means operable on movement in one direction to move said damper means to said one position and to close said valve and operable on movement in another direction to move said damper means to said other position and to open said valve, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said control means whereby movement of said responsive means will act to move said control means in said other direction, means re- Search H00:

sponsive to a condition in said generator-absorber, means to transmit movement from said last-named responsive means to said control means to move said control means in said one direction, a pilot burner for said fluid fuel burner, means responsive to a condition of said pilot burner, and means operable by said last-named means to close said valve irrespective of said first-named control means.

21. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operative relation, means to heat said generator-absorber, means to control said heating means, damper means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said geneartor-absorber, control means operable on movement in one direction to move said damper means to said one position and operable on movement in another direction to move said damper means to said other position, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said second-named control means whereby movement of said responsive means will act to move said second-named control means in said other direction, means responsive to a condition in said generator-absorber, and means to transmit movement from said last-named responsive means to said second-named control means to move said secondnamed control means in said one direction.

22. A refrigerating apparatus, comprising a generator-absorber, a condenser and an evaporator connected in operativev relation, means to heat said generator-absorber, means to control said heating means, damper means movable into one position to establish flow of cooling gases over said generator-absorber and movable into another position to establish recirculation of heating gases over said generator-absorber, control means operable on movement in one direction to move said damper means to said one position and operable on movement in another direction to move said damper means to said other position, means responsive to a condition in said evaporator, means operatively connecting said responsive means and said second-named control means whereby movement of said responsive means will act to move said second-named control means in said other direction, means responsive to a condition in said generator-absorber, means to transmit movement from said last-named responsive means to said secondnamed control means to move said second-named control means in said one direction, means to cool said condenser, and means controlled by saidfirst-named responsive means to control said cooling means.

EARNEST J. DILIMAN.

9 J CERTIFICATE or CORRECTION.

Patent No. 2,072,423. March 2, 1937.

EARNEST J. DILLMAN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, first column, line 43, for "absober" read absorber; and second column, line 8, after the word "in" insert open; page 2, second column, line 20, for the reference numeral "5" read 55; line 63, for "left" read lift; page 5, first column, line 20, claim 1 for "generator. absorber" read generator absorber; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of April, A. D. 1937.

Henry Van Arsdale (Seal) Acting Commissioner of Patents.

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