US2602589A - Humidity controlling system - Google Patents

Description

July 8, 1952 G. w. BASINGER 2,602,589

' HUMIDITY CONTROLLING SYSTEM FiledMay 51; 1950 v 2 SHEETSSHEET 1 1 COMPRE5SED WATER I Am TANK RESERVOIR I r]! II I II III/I III IIlII I I III! I II II I IIIIIJJ -3l 4 24 I (/1 I a V 34 24c Hi 2- ELECTRIC I83 I84 50 TIMER R bd 56 V I7! 55 I64- if .l EH53 no INVENTOR GL'ORGE W BASINGER.

ELECTRIC PNEUMATIC RELAY ATTORNEYS July 8, 1952 G. w. BASINGER 2,602,589

HUMIDITY CONTROLLING SYSTEM Filed May 51, 1950 2 SHEETS--SHEET 2 /{4?1 J 66 62 75 7, V hm Pg 7 Z 1 I INVENTOR 650005 N bum/05E.

5X Cafm *M ATTURNl-IYS Patented July 8, 1952 UNITED STATES PATENT OFFICE HiJMIDITY iJONTROLLING SYSTEM iGeorgW. 'Ba s inge'r, Charlotte, N. C. Application Mi-y 3-1, 1950, S BiialBT11);165,339 -1 Claim. (Cl. 236 4 4:)

This iiivrltion relates teen improved humidity controlling system for regulating the flow of compressed air to the usual; atomizers associated with the usual types of humidity controlling "sys-' temsemplo'y'ed in industrial plants and particularly in plants wherein textile materials "are processed.

The primary object of -this invention is to provide an improved means for maintaining :a uniform percentage of humidity in a given parcel of air without'd'epending solely upon a hygrostat as the i'nedium for controlling the admittance of compressed air to the humidifiers for atomizers.

l-t' iswel-l known, to thos'e'familiar with :the art, that the usual l-humidifying systems include .a plurality of atomizers or humidifiers to which moisture is admitted and to which compressedcair is also admitted to mix with the moisture and this how of compressed air to the humidifiersis usually controlled by a so-called blow-through or relief valve, the opening and closing of which is controlled by -compressed air.

Her-etofore, an instrument, usually a hygrostat or a hydrostat; has been employed for effecting the opening and closing of thepneumatic-reliei valve-of the type heretofore described for admitting compressed air to the atomi'zers. This particular type of instrument-includes a hygroscopic element responsive to variations in humidity, and suitable pneumatic connections have been provided'for opening and closing the relief valve in response to the hygroscopic element. However, the hygroscopic element has not always responded promptly to the function of the atomizers with the result that there would often be a complete saturation of the atmosphereadjacent the atomi'zer's'before the moisture in the atmosphere could affect the hygroscopic element to,-in-tui'n,close the relief valve and stop the-flow of compressed air to the atomizers.

It is, therefore, an object of this invention to provide an improved means for intermittently opening 'and'closing the relief valve for predete'r mined relatively short intervals the period at which the relief valve normally remains open, so "the compressed 'air is intermittently admitted to "the 'ato'mizers at like intervals, thus permitting the moisture from the atomizers to be more evenly dispersed about the room in which the atomizers are disposed and to produce the desired effect'onthe'hygroscopic element of the hygrostat before the atomizers will have saturated the atmosphere.

Somef the objects --of the invention having been stated-o'thei' objects will-appear as :the de 2 scription proceeds 'when taken in connection with the accompanying drawings, :in -which Figure l is a schematic illustration of a typical humidity controlsystem as it might be installed in a building; Y

Figure 2 isan enlarged view of the pneumatic relife valve or blow-through valve control unit with the cover removed;

- Figure :3 is'an enlarged elevation of an electricpneumatic relay with the .cover thereof removed, and with parts brokenlawayand in section, this relay also being shown in the right-hand lpwer portion of Figure 2;

Figure 4 1s .an enlarged vertical sectional view taken'substantially along the line 4-4 in Figure 2 and showing a pneumatic relay removed. :trom the panel shown in Figure .25

Figure 5is' an elevation of a typical electrically operated timer with the cover thereof removed, this timer also being shown in the upper righthand portion'of Figure2;

Figure fiis an enlargedelevation of a hygrostat with thelcover thereof removed andwhich isalso shown in the left-hand lower portion of Figure ,2;

Figure 7'--isa--viewlooking at the opposite side of the .hygrostat shown in Figure 6; I V

igure 8 -is1a vertical sectional view taken substantially alongthe line li t in Figure 4.

Referring :more specifically to "the drawings, the numeral ill indicates a portion of -a;building in which the improved humidity controlling system is adapted tobe disposed. The building 10 includes opposed-side wail-ls l l and I 2, a first :floor 1:3 and .a second floor .I 4.

The arrangement of the humidity control system :other than that employed in controlling the blow throu g-h or pneumatic relief valve to be later described, is show-n by way of illustration only since it is evident that there are many d-i'f ferent ways in which the'huinidity control system may be installed. In -a humidifying system,fa suitablereservoir 20 is usually provided and which is preferablyrdisposed at a higher elevation than a plurality of spaced atomizers or humidifier nozzlesz i so that water will flow from the reservoir 20 through a pipe 22 which communicates with the atomizers 2| to thus direct manner from the reservoir 20 to the atomizers 121 by gravity. A compressed air pipe :23 is :also connected to the atomizers 2| and this pipe v23 is connected to one side of a pneumatic pressure relief valve 25, thisvalve 24 also being knownto the-art as ablow throug h valve. The valve i4 is shown, in Figure 1-, as enlarged relative to 3 the atomizers 2i for purposes of clarity and will be later described in detail.

The pressure relief valve 24 has a pipe 25 connected to the end thereof remote from the end to which the pipe 23 is connected. This valve 24 is of a type such as is controlled for opening and closing by compressed air admitted to the valve 24 by a pipe 26, this pipe 26 being connected, at its end remote from the pressure relief valve 24, to a pneumatic relay broadly designated at/21 and disposed within a housing or on a control panel of a control unit broadly designated at 30. This control unit 30 broadly represents a compressed air control apparatus which is a part of the present invention and will be later described in detail.

The pipe 25 from the pressure relief valve 24 is connected at its end remote from the relief valve 24 by a pipe T Blato a pipe 3|. The pipe 3! is connected at its end remote from the pipe T 3Ia to a compressed air tank 32 to which compressed air is admitted by a suitable air compressor represented by a motor 33.

The end of the pipe BI'remote from the compressed air tank 32 is connected to one side of a regulator valve 34 to the other side of which a pipe 35 is connected, this pipe 35 extending from the valve 34 and entering the housing 30 (Figures 1 and 2). It is the usual practice to provide approximately thirty pounds per square inch of compressed air in the pipes 31 and 25 and which will be admitted to the atomizers 2| through the pipe 23 upon the pressure relief valve 24 being opened in a manner to be later described. It is preferable that the flow of compressed air be regulated for controlling the various control elements in the control unit 30 at a substantially lower pressure than that which passes through the pipes 3! and 25. Therefore, the regulator valve 34 is provided and may be a type which will sub stantially reduce the pounds per square inch of compressed air passing through the pipe 35, this pressure preferably being fifteen pounds per square inch. 7

It is evident that the control unit 30 need not necessarily be a housing since all of the instruments within the housing may be exposed if so desired. As a matter of fact, in order that the hygrostat 43, to be later described, may respond to the changes in relative atmospheric humidity, it is essential that this hygrostat be disposed so that the atmosphere may circulate through the hygrostat. Although this pneumatic valve control unit 35 is shown as a unit mounted in a housing or on a single control panel, it is to be understod that these parts may be disposed remotely from each other if desired, the showing in Figure 2 being a preferred arrangement of these elements. In Figure 1 the housing of the control unit 30 is shown provided with a hinged cover 36 which is omitted in Figure 2 for purposes of clarity.

The pipe 26, connected to the pneumatic relay 21, preferably has a conventional bleeder valve 40 interposed therein. The side of the pneumatic relay 2'! remote from the side to which pipe 28 is connected has a pipe lla suitably connected thereto and thi pipe 4m is connected to a pipe T 4| which also has the pipe 35 connected to one branch thereof. The branch of the pipe T 4| remote from that to which the pipe 35 is connected has one end of a pipe 42 connected thereto and this pipe 42 is connected at its other end to one side of a hygrostat broadly designated at 43, to the other side of which one end of a pipe 44 is connected through the medium of a pipe T 45. The other end of the pipe 44 is connected to the lower end of the pneumatic relay 21. The pneumatic relay 2? and the hygrostat 43 will be later described in detail.

The pipe T 45 also has one end of a pipe 41 connected thereto, this pipe 41' communicating with an electric-pneumatic relay broadly designated at 5B and which will, also be later described indetail. r

The electric-pneumatic relay 58 also has a pair of wires 5| and 52 extending therefrom which extend to and are suitably connected to an electric timer broadly designated at 54, this electric timer 54 also having wires 55 and 56 extending therefrom and being connected at their other ends to a suitable source of electrical energy, not

shown.

Now, the pneumatic relay 2?, the hygrostat 43, the electric-pneumatic relay 50 and the timer 54 are independently conventional elements and there are many diiferent types of elements similar to the elements 21, 43, 50 and 54, which may be employed in lieu of the elements 21, 43, 55 and 54, the particular types of elements shown in the drawings being shown by way of illustration only,

The invention resides in the combination of theserelays 2! and 5B, the hygrostat 43 and the timer 7 54 which are arranged so as to produce not only a controlled reaction of the pressure relief valve 24 to changes in atmospheric relative humidity, but also to intermittently open and close the pressure relief valve 24 at periods during which the pressure relief valve 24 would normally remain open, as would be the case during periods of relatively low relative humidity of the surrounding atmosphere.

The pneumatic relay '2'? may be of a type such as is manufactured by Minneapolis-Honeywell Regulator Company, Minneapolis, Minnesota, shown on a sheet issued by said company and identified as Form 95-1001-A under their type number RO49A2 and which is commonly termed a positive'or snap acting diverting relay. Since this pneumatic relay 2? is independently a conventiorial element, the details of the same shown in Figures 4 and 8 are given merely to illustrate its manner of operation rather than its complete structureand its description is based accordingly. The pneumatic relay 2! may include a cast body member 50 suitably secured, as by screws cm (Figure 8), to a base member 5:, this base member 5i being adapted to be secured on the panel of the control unit so as by screw 61b.

The base member 5| has a common chamber or channel 84 in th right-hand face thereof, in Figure 4, which communicates with the chambers 62 and B3. The chambers 52 and 8 3 have respective spring loaded valve members .55 and 66 which are normally urged against the restricted outer ends of the chambers 62 and 63. A lever or plate 78 is provided with a pair of adjustment screws H and 22 which are alternately moved into engagement with the right-hand ends of the respective spring loaded valve members 65 and 66 through the medium of a flexible gasket '13. This gasket 13 is adapted to close the channel 54 and is held in place by a block '74 secured against the gasket 13 and the base member 6! by screws l5. The block 14 has suitable openings 15 and 'H therethrough which are loosely penetrated by the adjustment screws H and 12.

A pivot screw threadably embedded in the plate 10 has one end of a torsion spring 8| pivotis pivotally connected to alev'er 82. The lever 82 is'oscillatably mounted intermediate its ends,

as at 83, on 'a-movable plunger 84. The end of the lever 82 remote from the end which is'con nectedto the torsion spring BI is -pivotal'ly mounted, as at '85 on theb'ody member 60;

It'will be noted that this plunger- 8'4'is'n0'rma1' ly'urged downwardly in Figure 4 by a compression spring 86 which bears against a pilot 8! and is adjusted as to compression by an adjustment screw 90 bearing against the upper wall ofthe body member 50 and threadably embeddedin the pilot 81. Thebody member 6t) has a first diaphragm chamber 9'I therein in which an enlarged portion 9-2 of the plunger 84 is disposed, thisportion 92 being either an integral part of the plunger 84 or being suitably secured thereto as shown in Figure 4. The plunger 92, has a flexible diaphragm 93 suitably secured thereto and this diaphragm 93 is held against the lower surface of the body member 68 bye suitable flange 94 which has asecond diaphragm chamber 95 therein. This flange 94 has thehpipe' respective chambers 62 and 63. The base member "G I' has one endv of the pipe 41a connected thereto and communicating with the passage- Way '9"! anda tubular pipe plug Illll is provided so that one end of the-passageway 95 is open to the atmosphere. a p'as'sageway IOI (Figure 8) therein which communicates with the channel 64 and also communica-tes with the'pipe III whichifs; suitably connected to the base 61, This completes the structure of the pneumatic relay 2] and its manner of operation will belater described. v

The hygrostat 43 is shown in detail in Figures 6 and 7. This hygrostat '43 may be of a type such as is manufactured by Taylor Instrument Companies, Rochester, New York -and is shown on their drawings numbered 6547 and 6548 relating to a Taylor room-type hygro'stat Thejparticular hygrostat 43 shown Figures 6 and 7 corn-prises a hollow base .niember H0, on theyouter face of which an adjustment level III is-mounted for oscillation, as at H2, its right-- hand portion-i-nFigure 6 being "held in adjusted position by an adjustment 'scrw H3 and a coma pression spring H4 bearing against a projection II- on the hollow base niembet IIB. "Thelfthand portion ofthe adjustment lever -I 'II has the lower end of a hygroscopic element designated broadly "at .II'I connected thereto; 'This hy roscopic element I ITincludes apluralityof strands I2'n whlchare res onsive to changes in 'a'trho's puene relative humidityto' move stirrups' I -2I and-I22; to vvliichf'tliey are connected, relative to each other. V

The lower stirrup I2! is connected'by'a tie neck 1' 23 "to the left-handpo'rtion or the "adjustment'lever I I I. The upper stirrup IZZis piVOtally connectedI interme'diate'the'ends or a bafilejm be'rjl'25 which is supported by ale'af spring member I26, this leaf spring member being projected upwardly and beingfixed, as by a pressed fit, in a'projection I 2'I integral with a bailie adjustment lever I3B;adjustab1y 'secured on theFouterface-of the base member Hit, byany suitable means such as screws j I 31; and flf32, this baiile-adjustmentlever being adjustable-so as to The base member 6-I also has projects -from the front or outer-"face of the'hol low base member III). I I The bleed-off hoz'zle 134 has a; passa eway I35" therein which is adapted to at times to be closed-'- by the bafile I25, this passageway Itdcomrimni i I eating with a hollow projection I36 on the rear surface of vthe hollow base member III]. A convention restriction pin I31 is provided "for ad ju'sting the size of the passageway I 35 atfit's" point of communication with the hollow projec=-' tion I36. It will be observed in Figure 7 that the hollowbase member I II} has a pair of spaced projections" I48 and MI integral therewith which-are lpro videdwith respective passageways I42 and H43 and to which therespective pipe: 42, and pipe '1 45 are connected. The ends of the projections- I40 and HSI remote from the ends to which the" respective pipe 2 2 and pipe T are connected have respective pipes M5 and I45 connected thereto, the passageways I42 and I43 serving as" the means of communication between the "pipes"- 42 and ldfiand the pipe T 45 and pipe 146. Itmay be observed in Figure 7 that the projection I35 is of substantially less 'length than the. Width-Of the hollow base member H0 and the right-hand end thereof-has the end of the pipe; I46 remote from the projection I4'I connected thereto. The end of the pipe I45 remote from the projection I40 is also connected and'commu nicates with the hollow projection I35. One end of a pipe I59 also-communicates'with the-hollow projection I35 and its other end is connected intermediate the ends of a horizontally disposed substantially tubular aspirator nozzle l-5I projectingfrom the rear surface of the tubular base, member-H0. r The hollow base-member I II also has a tubular portion I52 projecting therefrom and. forming --a venturi, this tubular portion I52 being providedwith a bore I53 which communicates with the tubularasplrator nozzle I'5I. The base member III! has an opening I54 therein which communicates with the bore I 53 in'theventuriI 52.

In operation, compressed air flows continuously from the compressed air tankfiZ through the pipe. 31-, regulator valve 34, pipe 35, pipe T M and pipe 42 to the hygrostat t3. The compressed air'then flows through the passageway I42 inthe projec tion I49, through the pipe I45, through the hollow projection I36 and-through the pipe IED-and finally through the aspirator I5I 'to be ventedthrough the venturi I52. It is Well known, tothose familiar With the art, 1 that the --movement of compressed air'past the opening I54 willcause air, to circulate past the medial portion of the strands I28 of the hygroscopic element -I H, through the opening I54 to thus assist in circulating the atmosphere, in the room in which-theatomizers 2I are disposed, past the hygroscopic element H1.

The pneumatic relief valve 24 maybe ef cen- I ressures adapted to pass to the an)r'n izejrs lifI 5 when the air valve member24b is unseated. The

pressure on the diaphragm24a is counteracted by a spring 24d and said diaphragm is connected with the air valve 241? through a stem or the like 24a. The stem 24c also carries a second valve member 24] adapted to engage the bleed-ofiport 24g in the housing 240, the bleed-off port being normally closed when the-valve;24b is unseated,

v and vioe versa; 3

During normal operation, as has heretofore been the case, and assuming the pneumatic relief valve 24 to be open,.compressed air will flow from the compressed air tank 32 through the pipes 3I 25 and 23 to the atomizers 2I until the moisture emitted from the atomizers ZI will have produced a desired relative humidity in the surrounding through the passageway I42 and pipe Hi5, will be 7 partially exhausted through the passageway I35 of. the nozzle I34. This will bleed the pipe I45 and its associated pipe 44 with the result that the parts of the pneumatic valve 21 will assume substantially the position shown in Figure a.

With the parts of the pneumatic relay 21 in the position shown in Figure 4, the spring loaded valve member 56 willbe in closed position and the'spring loaded valve member t will be in opened position, with the result that the compressed air from the pipe 4la will'be unable to enter the passageway 91 (Figure 8) and, there'- fore, will fail to admit compressed air to the pipe 26 (Figure 2). As is well known, this will cause the pneumatic relief valve 24 to close, since the air in pipe 28 will escape through passageway IQI, channel 64, passageway 96 and tubular plug N30, to the atmosphere, in the course of which the spring 2411 will seat the valve member Mb. This prevents compressed air from flowing from the pipe 25 to the pipe 23 and the associated atomizers ZI.

and. the air pressure still on the atomisers side of valve housing 240 is bled on through the now open bleed-off port 249.

On the other hand, upon the relative humidity of the atmosphere decreasing below a predetermined point, the hygroscopic element II1 will decrease in length thus moving the baffle 425 against the nozzle I35 to close its passageway I35 and to prevent the nozzle I35 from bleeding the compressed air from the pipe I45. The compressed air from the pipe I45 will then flow through'the pipe I415, passageway 543 in the projection MI, pipe T 45 and pipe 44 to enterthe lower chamber 95 of the pneumatic relay 21 in Figure 4. This will cause the medial portion of the diaphragm 93 to move upwardly to, in turn, cause the plunger 85 to move upwardly against the compression spring 86. This will partially rotate the lever 82, in a clockwise direction in Figure 4, and will cause the plate 10 to reverse its position from that shown in Figure 4 to where theadjustment screw 12 will move the spring loaded valve member 66 to opened position and The downward movement of the valve stem 24c also movesthe valve'disc 24, off its seat will permit the spring loaded valve member 65 to move to closed position.

Compressed .air will then flow from the pipetla (Figure 8) through the passageway 91,

through the channel 64- and thus through the passageway IIlI to the pipe 26, to move stem 24c and valve members 241), 2.4g. upwardly thereby unseating valve member 2%, thus opening the pneumatic relief valve 24. This will permitcompressed air toflow from the pipe 25 through the pipe 23 to the. atomizers 2| in the manner heretoiore described. I

The arrangement of thehygrostat 43 and the pneumatic relay 21 and its operation as heretofore described isconventional and does not constitute a part of the present invention. However.

it is with these or. similar part5 arranged in the manner describedv that the arrangement constituting the present invention is adapted to be, associated.

Heretofore, the pipe 44 has been connected directly to the'hygrostat 43 and the pipe T 45 is provided as a means of connecting the pipe 41 (Figure 2) in communicating relation to the pipe 44.

There are many types of electric-pneumatic relays which may be employed in lieu of therelay 59, shown in Figures 2' and 3, the relay 5!] being shown by way of illustrationonly. This relay 53 may be of a type such as in manufactured by Minneapolis Honeywell Regulator Company under their type number RO40OA and which is commonly termed an electrically operated pneumatic diverting relay. Since the electric-pneumatic relay is also independently a conven- V tional element, the details of this electricpneumatic relay 50 shown in Figure 3 are given merely to illustrate its manner of operation rather than its complete structure and its description is based accordingly. This electricpneumatic relay as describedis illustrated and described'on a sheet issued by said company and identified as form Number 59-1378.

The electric pneumatic relay 50 is shown, in the lower right-hand portion of Figure 2, witha cover I60 mounted thereon, this cover I60 being removed in Figure 3 to expose an irregularlyshaped base member IBI which suitably supports a cast member I52. A block 53, suitably secured to the cast member I62, has an armature I64 pivotally mounted thereon, as at I65. The armature I64 is adapted to be partially rotated in a counterclockwise direction, in Figure 3, upon a soft iron core I61 being energized through the medium of a magnetic coil E10 having wires Ill and I12 extending therefrom to respective terminals I13 and I14 to' which the respective wires 5| and 52 heretofore described are connected. Upon movement being imparted to the armature IE4, in a manner to be later described, a relay lever I16, secured to the upper portion of the armature I64, as by a screw I11, is caused to partially rotate in a like direction to that of the armature I64. I

A valve lever I80, pivoted as at I8I on the cast member I62, has an outwardly projecting leaf portion or ear I82 integraltherewith which loaded valve member I to assume a closed posi-,

tion as shown in Figure 3. The cast member I62 has a chamber. I85 therein in which the spring b i'lllid is restricted so downward'move and-being provided with a' GOsecOnd di *P ntially-as-described in United State iioaded valve member 18 5 is mounted for vertical 5 ding movementand the'lowerend'oi the'c amu i of the se ies leaded r lic m m e W111 b s'eth mem e -1 t. Mana r av 8 w n te te i152 provides communication between the pipe 41 5n mbr M The'c member lfiz has an open ended than,-

nel 9U thereinfthe bottom .o'f which is closed bya flexibleinember or, gasket 15.! held inlplace by an -I,.-'-s'ha'ped strap iron mem e l'az secured,

at b s ew 193; 'to' as mf btr l-i T ar we e e i a blr' ee re -b a e justment screw? 194 which, upon "movement of the valve lever- I80 in 'a clockwise'dir'ec-tion in relay 2 to assume .the position shown in Figurei.

There are many types of time switches which may be employed-in association with the present in ent n, the timer 54in Fi ures 2 and 5 bein shown by way of illustration only. This timer 54 may be of atypesuch as in manufactured by Paragon Electric Company, Two Rivers, Wisconsin, un-der their number 6-817, Typeu '11 "{I-his rti culai'ftimerortime switch-is of a type subthe tim 's'witoh 544s shown ii'i's'aid patentfadetailed descriptionthereof'is deemed unnecessary, it merely being necessary hat the wires 51 and ,52 ,bej,c9nnected to suitable putput terminals 209 andZfll and that one of the'wires 55 or '56 be connected to the terminal 200 and the other of the wires 55 or 55 be connected to an input terminal 203 (Figure 5). The time switch 54 should be of a type which may be adjusted to intermittently complete the circuit to the solenoid coil I of the electric-pneumatic relay 50 (Figure 3) for periods of a relatively short duration. The length of the periods during which the coil H0 is energized and the intervals therebetween may vary according to the atmospheric conditions and according to the relative humidity desired in the atmosphere of a particular room. For example, if it is desired that the relative humidity of the atmosphere in a particular room be held to approximately eighty percent, the time switch 54 should be adjusted substantially to complete a circuit to the magnetic coil I19 for six second periods at intervals of six seconds. The optimum periods and intervals therebetween may be determined by trial and error.

Thus, assuming the relative humidity of the atmosphere of the room shown in Figure 1 to have reached the desired percentage of, say, eighty percent, the hygrostat 43 (Figures 2 and 6) will bleed the compressed air from the pipes I46 and 44 in the manner heretofore described,

. 10 atm s eresurround ng th win ers Z1. and the y i 's'tt 14,3; a in btlQW tll i e i qd htt' t ei th v m tst .3 w'ma a'm b bi s d'e t j 2.19.,

5 h'yerd tstiiiandthrqueh hi rlp 1'8- av- 21 Fi ure 41 au itsnemit orn ts ed ai to" flevf 'm h .r p 911 i ures and 8 th su h thern smet t rt ay 2. the pipe an the. inter osed relive 69" the, Pneumat re ie valve; 124 to a ai mit qu r iesst eir a ead.-

) i ma netic 99. n (Fi t"e1a'y tnu i i flielav .5"- i n t be t ie fiivs s ed "t9 the hyerostet 143 9 ue'pe f ds 11.I whic 1. 'befil 1121.5" o the lir sta s 191? mess e msn ithths n zzi mw r r. p n t baffle J mevi ai tesetrziiitte'rit ly openihg fand"'clos i ii g the pneu atic 'reliefvalv 2436i predetermined relativlyshort intervals during the period at which the relief valve normally remains open, with the result that the moisture emitted from the atomizers may be homogeneously dispersed throughout the room in which the atomizers' are disposed and, in so doing, produce the desired effect on the hygroscopic element II! which, heretofore, has caused the pneumaticreliei valve 24 to close for a substantially longer period than the period at which it is closed through the medium of the electricpneumatic relay 50 and the cooperating time switch 54 or until the relative humidity has again dropped below a predetermined percentage. This will prevent the atomizers 2! from saturatingthe atmosphere immediately adjacent the same before the relative humidity of the atmosphere adjacent the hygrostat 43 will have reached the desired percentage to effect the closing of the pneumatic relief valve 24.

In the drawings and specification there has been setforth a preferred embodiment of the invention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claim.

I claim:

In a humidity controlling system having a plurality of pneumatically controlled moisture emitting atomizers, a first pipe connectionv between a source of compressed air and the atomizers, a normally closed blow-through valve of a type having a by-pass to the atmosphere for the atomizers when the valve is closed interposed in the first pipe connection, a hygrostat, a second easement with t e 13952151 54 ri r i V r enteringthe ii A pipe connection'betweenthe hygrcstat and the source vof compressed air, a snap-acting pneubetween the pneumaticfrelay and the blowthrough valve, means on said hygrostat for admitting compressed air' from the second pipe con- .nection to the third pipe connection during periods of relative humidity below a predetermined .percentage, means on the pneumatic relay for instantly effecting communication between the ,fourth and the fifthpipe connections when compressed air is admitted to the pneumatic relay through the third pipe connection, means for opening said .blow-throughvalve upon compressed air being admitted thereto from: the source of compressed airthrough the fourth and fifth pipe .connectionsto thus permit compressed air to flow to the atomizers, said hygrostat also being operable to prevent compressed air from flowing from the second pipe connection 'to the third pipe connection and thus to the pneumatic relay and simultaneously exhausting the compressed air from the third pipe connection during periods of relative humidity above said predetermined percentage, means on the pneumatic relay for instantly preventing communication between the fourth and fifth pipe connections and simultaneously exhausting the compressed air. from the fifth pipe connection upon the compressed air being exhausted from the third pipe connection to close the connection effected by the blow-through valve between the source of compressed air and the atomizers andto thereby permit the pressure in the atomizers to be exhausted through the blow-through valve to immediately close-the V atomizers, the combination of an electric-pneustates nection between a source of electrical energy and the time switch, a second electrical connection between the time switch and the electric-pneumatic relay, a sixth pipe connection between the electric-pneumatic relay and the third pipe connection, means on the time switch for intermittently energizing the electric-pneumatic relay, means on the electric-pneumatic relay normally closing the sixth pipe connection and means on the electric-pneumatic relay responsive toenergization thereof for opening the sixth pipe connection to thereby exhaustcompressed air from the third pipe connection at intermittent intervals of relatively short duration during the periods in which the hygrostat is permitting compressed air to flow to the third pipe connectio-nto thereby prevent compressed air from flowing between the fourth and fifth pipe connections through the pneumatic relay intermittently to accordingly control the operation of the blow-through valve to thus insure homogeneous dispersion of moisture from the atomizers into the roomin which they are disposed.v V

GEORGE W; BASINGER.

REFERENCES CITED The following references are of record in the file of this patent:

Great Britain May 26, 1948

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