US1819370A

US1819370A - Expansion valve

Info

Publication number: US1819370A
Application number: US507899A
Authority: US
Inventors: Rasmus M Hvid
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-01-10
Filing date: 1931-01-10
Publication date: 1931-08-18
Anticipated expiration: 1948-08-18

Description

Aug. 18, 1931. R. M. HvlD 1,819,370

EXPANSIQN VALVE l Filed Jn. 1o. 1951 I Patented` Aug. A18,1931 i UNrrED srA'rEs PATENT OFFICE Rasmus 1u. nvm, or onrcneo,l ILLINOIS EXPANSION 'VALVE Application led January 10, 1931. Serial No. 507,899.

My invention relates to expansion valves lows head having an annular portion or for use in refrigerating machines and parflange 22, and a tubular portion 23 that ticularly to -a novel construction having engages the boss. A bellows 24 constructed numerous advantages, that will be pointed in the form of an annulus is secured at one Afr out hereinafter. end to the support 22 and at the lower end 5o Anvobject of my invention is to provide to a floating head having an annular por-V an expansion valve of extreme simplicity and tion 25 and a tubular portion 26 that proof very small size, one that can be cheaply jects upwardly into the space at the center manufactured and that is adapted forkwide of the bellows. A vrelatively strong spring variation in the capacity or variation in 27 is interposed Ibetween the support and 55 pressures that may be handled. the head, a spring of suitable strength being A particular object is to provide a conselected to balance or off-set the expected struction in which there are no levers used pressure oXeI'tcd on the exposed area oi the in actuating the valve, and in which all parts SHOWS head. This spring is of fixedl resistare symmetrically arranged with the needle 3410, that 1S, 110 regulating mea-11S 'are prO- 60 valve' as their axis. The conservation of Vldedf space isaccomplished in a simple manner A glude Sleeve has a neck 28 which is that will be apparent, from the following pressed into the tubular portion 23 of the description.Y support, while the depending portion 29 2o My invention will be more readily underf VPIOJGCSS COWIlWLIdly and CtS 21S a guido 65 Stood by reference t0 the, accompanying fOI the tubular pOItlOII 26 Of the head. The

drawings, in which: `neck portion 28 has an inwardly projecting Fig. 1 is a plan view of a valve constructed Jalge 30 3115i the tubular portion 26 has in accordance with my invention, and a Correspondmg flange 31. To these flanges Fig. 2 is a vertical sectional view thereof. iS Sellled by SOldeIIlg olwcldng, a SBCOIld 70 The illustrations on the original drawings bellows 32 that surrounds the needle valve filed herewith are intended to be double Seele, 18 and serves to seal the interior of the large that is, the illustrations are twice the size of bellows 24.. -the aotual device, The needle valve has a disc like head 33 In the drawings I have shown a casing a margin of which underlies the flange 31 75 comprising -a head 10 and a cup 11 in thread. of the bellows head, the disc having suitable' ed, air-tight engagement, The head eenopenings 34 thereon to permit the escape tains'an inlet passage 12 for the refriger- 0f llqllldthat passes therethrough. ating liquid7 a pipe'nipple projecting into The described parts may be constructed 35 the passage carrying a screenll. The head as a unit and then merely threaded into the 80 `also contains an outlet opening 14 in combOSS 2 1- 4 munication with the low pressure space 15 Varlable spring pressure is exerted on the lwithin the! cup. y lower end of the n'eedle valve by means of The wall 16 dividing the passage 12 from the spring 35, the upper end of which is 40 the low pressure chamber 15 contains a port Contained on a cap 36, and the lower end. 85

17 controlled by a needle valve 18, and inwithin a Screw Socket v37 that projects ycidental guide and seal members 19-20. A through the lower wall of the cup and is boss l21 surrounds the port` and acts as a adapted for actuation from the exterior of support for the valve controlling mechanism the casing. In order to seal the interior of about to be described. -This comprises abel:` the casing against any yescape around the adjusting socket 37, I provide a third bellows 38, soldered at its upper end to the spring cap, and at its lower end to the upwardly projecting boss 39 on the cup. Thus the adjustment offthe spring may be changed or the spring removed and replaced without unsealing the casing.

With the parts assembled as shown, with the low pressure chamber in communica- 'tion with the evaporation chamber of a resupplied by the spring 35, the regulation of` which force is effected from the'exterior of .the casing. By this meansv a ywide varial limited except tion in pressures may be handled without change in the proportions of thepar'ts.l

The construction as described may be very f simply manufactured and assembled, and is .adapted to handle any pressures on the low side, rom'20 lbs. above atmospheric to 25` inches of mercury below atmospheric l.All

the parts are symmetrical about the needle valve, thereby avoiding unevenness of valve wear, and conservingy space to the greatest extent. Obviously the construction is dapable of some modification, and l do not wish to be as indicated in the appended claims.

l claim:

l. ln combination, a casing, a wall therein providing low and high pressure chambers, said wall having a port, a needle valve controlling said port, a bellows in the low pres.- sure chamber, said bellows having an axial opening, one end of the bellows being hxedly connected to said wall, a doatin bellows head to which the opposite end og the bellows is connected, means for guiding the reciprocation of said bellows head, means `connecting the bellowshead and needle valve, a spring tending to expand said bellows and to open said needle valve, a second bellows surrounding the needle valve and connected at one end to said bellows head, a second spring tending to close said needle valve, and a third bellows surrounding said second spring, said second and third bellows and said springs and needle valve being with the axial opening in the irst bellows.

2. ln combination a casing having a port, a needle valve controlling the port, a bellows within the casing .and subject to the pressure to be controlled, said bellows having an axial opening and surrounding said valve' 3. In combination, a casing having a divi-A sion wall dividing the vinterior of the casing into high and low pressure chambers, said wall having a port, a ring bellows mounted in 'the low pressure chamber, a needle valve controlling said port and connected to said bellows, a spring of ixed resistance tending to open said kvalve against pressure exerted on said bellows, said valve being located within and at the axis of saidring bellows,

a second bellows surrounding the valve and sealing the interior of said rst bellows, a spring bearing against and arranged lon'- gitudinally of said valve and tending` to .l close said valve, and adjustable means -operable romthe exterior of said casing for `regulating the force of saidl vlast named spring.

4. In comblnation,

into high-and low pressure chambers, sai wall having a port, a ring bellows mounted a casing having a divii sion wall dividing the interior of the'casingl thelow' pressure chambenfaA needle` valve controlling said port and connected to said 1 bellows, a spring of lixed resistance tending to opensaid valve against pressure exerted on said bellows, said valve being located within and at the axis of 'said` ring bellows, a second bellows surrounding the` valve and Q sealing the interior of said -drst bellows, a springbearing against and arranged-longitudinally of said valve and tending to close sai-d valve, a third bellows surrounding said spring, and adjustable means operable from the exterior of said casing or regulating the 'force oi said last named spring. 5. lln combination, a easing having a division'wall dividing the interior of the casing into high and low pressure chambers, sai

wall having a port, aring bellows mounted in the low pressure chamber, a needle valve controlling said port and connected to said bellows, a spring o fixed resistance tending to open said valve against pressure exerted on said bellows, said valve being located within and at the axis of said ring bellows, a second bellows surrounding the valve and sealing the interior of said rstbellows, a

spring bearing against and arranged longitudinally of said valve and tending to close said valve, a third bellows surrounding said spring, and adjustable means operable from the exterior of said casing for regulating the'orce of said last named spring, the axes of all said bellows and said springs being controlling said port, a secondv valve for controlling said port, a second spring bearing on the end of said valve and positioned in line therewith, said valve, said springs, said second bellows and said guide sleeve being within the annular opening in said first bellows and all said parts having a coinciding longitudinal axis.

'7. In combination, a casing, a wall therein having a port, a fixed bellows support, a

bellows inthe form of an annulus having one end fixed to said support, a bellows head to which the other end of said bellows is secured, a spring interposed 'between the support and head, a guide sleeve on which said head is guided, a second bellows held at one end in fixed relation and at the other end secured to said head, a needle valve for controlling said port, a second spring bearing on the end of said valve and positioned in line therewith, and a third bellows surrounding said second spring, all said bellows, said springs and said valve having coincident longitudinal axis.

8. In combination, a casing having a wall `providing a port, a boss surrounding the port, a* bellows support having an annular flange and a tubular portion threaded on said boss, a ring bellows secured` at on'e'end to said flange, a bellows head having an annular flange to which the' opposite end of said bellows is secured, and a tubular portion, a sleeve depending from said boss and acting as a guide for the tubular portion of said head, a second bellows connectedat one end to said boss and at the other end to the tubular portion of said head whereby to seal the interior" of said first bellows, a needle valve controlling said port and arranged axially of both said bellows, said valve having an end disc' cooperating with said head for movement therewith, a spring aligned with said valve, a cap overlying said spring and contacting said end disc, a third bel- 'lows connected to the cap at one end and to the casing at the other, and spring adjnsting means operable from the exterior of the casing.

9. In combination, a casing having a wall providing a port, a bellows support secured to said wall, said support having an annular portion arranged parallel/to said wall, a ring bellows secured atoiie end to said annuvalve controlling said port and arranged axially of both of said bellows, means connecting said valve to said bellows head, and spring means acting on vsaid valve tending to close the same. 10. In combination, a casing having a wall providing as port,` a bellows support secured to said wall, said` support having an annular portion arranged parallel to said wall, a ring bellows secured at one end to said annular portion, a bellows head having an annular portion parallel to the annular portion of said support, to which the opposite end of said bellows is secured, said head having a tubular portion projecting into theV center opening in said bellows, a sleeve projecting from said wall and acting as a guide for said tubular portion, a second bellows connected to said sleeve, and at the other end to t lie tubular lportion of said head whereby to seal the interior of said firstbellows, a needle valve controlling said port and arranged axially of both of said bellows, means connecting said valve to said bellows head, and. spring means, adjustable from the exterior of the casing, tending to seat the valve.

11. In combination, a casing, the headV of which provides inlet and outlet openings and a port, a cup depending from said head providing a low pressure chamber and symmetrical valve mechanism arranged in said low pressure chamber and comprising a ring bellows, a bellows support having 'an upwardly extending tubular portion adaptedA for gas tight connection to said head, a floating bellows head, a spring tending to expand said bellows, a second bellows conchamber and comprising a ring bellows, a

bellows support having an upwardly extending tubular portion adapted for gas tight connection to said head, a floating bellows heal,v asprn tending to expand said; bel- '.1ows5- 2m` secon bellows contained withn'the center recess in said first bellows and serving x to Sealih'e same, a needle valve located at the gaxes of vsecl bellows and adapted to control l Y s aid. port-means connecting saidneedlevalve i Y to sald-oating head, aspring actngverti- `cally omy said .valve :mtl adjustablefrom the. ,o 1 exterior-ofthe casing, and af-thirdbellows i Y- 3:10 fnelos" ng Seid named spring and sealing f "ftheinterofjof said easing froml outside air. rflljlgrte'stilnony whereof I have axed my