US853541A

US853541A - Automatic expansion-valve.

Info

Publication number: US853541A
Application number: US29797906A
Authority: US
Inventors: Arthur H Eddy
Original assignee: CHARLES E SHEPARD
Current assignee: CHARLES E SHEPARD
Priority date: 1906-01-26
Filing date: 1906-01-26
Publication date: 1907-05-14
Anticipated expiration: 1924-05-14

Description

PATENTE@ MAY 14, 1907.

EDDY. AUTOMATIC EXPANSIG VALVE.

UNITED STATES PATENT OFFICE.

ARTHUR H. EDDY, OF W'INDSOR, CONNECTlCUT, ASSIGNOB. OF OEE-HALF TO CHARLES E. SHEPARD, OF HARTFORD, CONNEHCUT.

AUTOMATC EXPANSIN-VALVE.

Speciicatcn of Itters Patent. Applicaties led January i 1956i Serial No. 297,079.

Patented May 14, 1907.

llowing is a specification.

This invention relates to an expansion valve which operates toautomaticall control the low of refri erating fluid to t e expansion coil in the re rigeratmg compartment according to the temperature of t e atmosphere in the com artment or temperature of the liqud`in W ch the expansion coil may be submer ed. T e object of thisinventon is to provide a simple, durable and compact valve of this nature which is sensitive and which is easily regulated so that it will o crate at the necesy sary times to cause an e cient action of the relrigeratin ap aratus.

In the ern o ment of the invention which Ais illustrated by the accom anying drawing the valve is normally held c osed by the pressure of the rerigerating iiuid on a diaphraY located on the expansion side ofthe valtlf and the valve is opened by the tension of a spring which is arranged in o position to the ressure of the daphr t e action of 4the `a hragm' as affectedlxy1 the fluid ressure or y the spring pressure being me ied by the action of an expansionv dia hragm located between the pressure diap a and the valve and arranged to be expan ed and contracted by the expansion and contraction of alluid which is exposed in a thermic receptacle placed as desired in the compartment the temperature of which is to be refri erated.

he accompanying drawing shows .a central vertical section of a valve that embodies the invention. l

Over the end of the casing 1 and held in Vplace by the frame 2 of this valve'is a diaphra 3. The expansion chamber 4 above this 'aphra is connected by a passage 5 with the out et 6 which is adapted to be connected with a pipe that leads to the expansion coil in the compartment which is to be refrigerated.l The expansion chamber communicates through the port 7 in the block 8 with the pressure chamber 9 that connected by the passage 10 with the inlet 11 tvhich is adapted to be connected with a pipe from a receptacle containing the supply of refrigerating fluid, usually ammonia, in a liquid state and under pressure.

On the upper surface of the block about the port is a valve seat 12 and movable towar and from this 'seat is a valve 13. The valve stem 32 may be guided in its movement so that the valve will seat properly by prongs 14 extending from the head 15 at its lower end Aand by extending its upper end into a lrecess 16 in the cap 17. A'spring 18 thrusts between the block and the head of the stem so as to hold the head against the expansion diaphragm 19 which is located in the expan sion chamber. The s ring which is shown between the block an the valve stein head need not beV employed if the valve stem is attached permanently to the expansiondiaphrssm! Between the pressure diaphragm and the expansion diaphra is a pad 20 and below theV ressure diap ra 1s a pad 2l.

s ir spring 22 thrustlng between thescrew puff 23 and a Washer 24 with legs 25 tends to ol the lower pad in osition and a s idershaped spring V26 held y a sleeve 27, t e position of which is determined by the adjustment of the screw plug 28, presses the lower pad and the diaphragm upwardly with the requisite force. I

A Atube 29 extends through the plugs, sleeve, pads and the pressure diaphragm, and opens into the ex ansion diaphra in. This tube is connected Ey a pipe 30 Wit a closed receptacle 3i which is designed to be laced in a brine tank or in the atmosphere in the compartment cooled by the expansion of the rerigerating fluid in the expansion coil. This receptacle, pipe, tube and the exparisien diaphragm are preferably iilled full of an expansible fluid such as alcohol. The expansion and contraction of this fluid due to the various changes of temperature to which the receptacle 1s subjected in the conipartment being cooled, causes an expansionV and contraction of the expansion diaphragm and this of course causes a variation of the length of the connection between the pres- 'sure diaphragm and the valve.

The refrigerating fluid pressure on the pressure diaphragm tends to contract the expension diaphragm and force down the pressure diaphragm and allowV the valve to be IOO closed gainst its seat by the valve stem s ring. The spring plressure that opposes theiluid pressure on t e diaphr m tends to move the valve from its seat. n this case the spring pressure and the expansion of the expansion diaphragm tend to open the valve and the spring and the Huid pressure in the expansion chamber and the contraction of the expansion diaphragm tend to close the valve. Cnnsequentl the times of open` and clos` 0 of the va ve and the extent of the opening i e ends on the relations of the amount of ownward pressure on the pressure diaphragm due to the fluid pressure, the pressure of the valve stem spring, the condition oil the expansion diaphragm due to in ternal pressure, and the amount of u ward pressure due to the force of the springs elow the ressure diaphragm.

there is not sufiieient flow of refrigerating fluid to keep down the temperature in the compartment being cooled the temperature will rise and the rlsing temperature will cause an expansion of the regulatin fluid and consequently an expansion of t e expansion diaphragm. Thls lengthens the distance between the pressure dlaphragm and the valve and conse uently if the ressure in the ex ansion cham er is normalpthe valve is lifte from its seat so as to permit more rerigerat fluid to flow. If the pressure in the expansion chamber is abnormal it may be that it will force the pressure diaphragm back against the springs-and still hold the valve to its seat. As more rerigerating fluid Hows past the valve to the expansion coil and the tempe rature drops as a result of this the regulating fluid contracts and the, contraction of this Huid allows the expansion diaphragmlto contract and ca use the valve to close unless there is an unusually low fluid pressure in the expansion chamber.

fluid, an expansion diaphragm controlling the opening and closing of the valve, a diaphragm mounted to control the position of the expansion diaphragm and subject to the ressure of the re rigerating fluid on the eX- 5o ansion side of the valve, and a thermostatc regulator connected with the expansion diaexpansion diaphragm, fled.

v il

hragm for contracting and expanding the substantially as speci- 5 2. A` refrigerating ap aratus having alve for controll' the ow of rerigerat' uid, a pressure diaphragm subject to the ressure of the refrigerating fluid on the eX-' ansion side of the valve, an expansion diahragm located between and connected with oth the pressure diaphragm and the valve,

and a thermal regulator connected with the expansion diaphragm for causm Slon and contractlon, substantla to thrust the pressure dia sion diaphragm located nected Withlboth the valve and the pressure diaphragm, and a th its expanly as specio 5 ed.

3. A refr' erat' a aratus havin a alve for xlonlrollinmgthelw of rerigeraing uid, a pressurev diaphragm subject to the ressure of the rerigerating fluid on the exansion side of the valve, a spring arranged hragm against the ressure of the refrigeratmg fluid, an expanbetween and conermal regulator conected with and adapted to cause the eX- ansion and contraction of the expansion iaphragm, substantially as specified.

ARTHUR H. EDDY.

Witnesses:

HARRY R. WILLIAMS', E'rrrEL M. LOWE.