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Publication numberUS920392 A
Publication typeGrant
Publication dateMay 4, 1909
Filing dateNov 9, 1908
Priority dateNov 9, 1908
Publication numberUS 920392 A, US 920392A, US-A-920392, US920392 A, US920392A
InventorsFrank A Rider
Original AssigneeFrank A Rider
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Refrigerating apparatus.
US 920392 A
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Description  (OCR text may contain errors)



Patented May 4, 1909.

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Patented May 4. 1909. 4

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Specification of Letters Patent.

Patented m 4, 1909.

Application filed November 9, 1908. Serial No. 461,764.

To all whom it may concern:

Be it known that I, FRANK A. RIDER, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Refrigerat- Apparatus; and I do hereby declare the 'wlng to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in refrigerating ap aratus, and more particularly t'o means or passing liquid ammonia from the condensers to the expansion coils.

Experience has demonstrated the advisability of keeping the expansion coils supplied with liquid ammonia and of feeding the ammonia in bulk from the condensers where it is liquefied, to the expansioncoils. An object of my present invention is to provide means whereby the liquid-ammonia is passedto the expansion coils as fast as it is produced in the condensers, irrespective of amounts, ressure, temperatures or other externali uence.

A further object is to provide means whereby the unbalanced weight or head of a column of liquid ammoma is utilized to automatically control the operation of a delivery valve and pass accumulated liquid ammonia from the condensers to the expansion coils-at the same time holding aclg suflicient pressure on the condensers to liquefythe ammonia therein.

With these" objects in view the invention consists in certain novel features of construction and combinations of arts as hereinafter set forth and pointed out in the claims.

being shown at the same side 0 In the accompanying drawings, Figure 1 are connected by means of a suction pipe 3 with a compressor 4 and the latter is-connected by means of a ipe 5 (which maybe conveniently termed t e high pressure hot gas p pe) with one end of the condensers V be explained.

- movable Liquid ammonia leaves the condensers by the tica y or approximately so in order to give a head. or wei ht of liquid for a purpose hereinafter exp ained, and the liquid ammonia enters the expansion coils by way of a pipe 7. Between the pipes 6 and 7, my im-e proved valve devices are ocated and the construction and operation of the same will now A cylinder or casing 8 is provided in its bottom plate 9 with an outlet 10 with which the pipe 7 leading to the expansion coils is connected; The cylinder 8 is also provided with an'inlet 12 for the reception of the'pipe 6 which conducts liquid ammonia from the condensers,'the assage of this liquid am monia from the in et 12 to the outlet 10 with which the pipe 7 communicates being controlled by means of a valve 13. In constructing this valve the bottom )late 9 ofthe casing is provided'centrally, wit a post 14 made tubular throughout a portion of its length and provided in its walls withperforations 15 located at different levels and connecting the interior of the cylinder with the tubular poring the cylinder by the pipe 6 can pass through perforations of the post and from the tubular portion of the latter pass to the expansion coils by way of the pipe 7. The part of the valve consists of a tube 16 adapted to telescope over the post 14 and open or close more or less of the 'erforations 15v according to the position of said tube. Thetube 16 is connected with and moved by a weighted piston 17 located in the upper portion of the cylinder or casing 8, and at a point above this iston, a pipe 18 connects the cylinder with t 1e high pressure side of the apparatus; i e, the hot gas return ipe 5.

- Jhen the Wei ht or head of iquid cntel-ing the cylin er by the pipe 6 from the condensers is 'sufiicient to overcome the weight of the piston 17, the latter will be caused to rise and the tube 16 correspondpipe 6, a portion of which is disposed veringly moved to uncover more or lessof the the quid ammonia to the from the condensers as fast as it is condensed to the expansion coils and maintain the supply of liquid ammonia to the latter constant. tendency on the part of the condensers to hq'uefy the gaseous ammonia with sufficient rapidity (which might occur if the liquid be permitted to leave the condensers more rapidly than the pressure exerted by the compressor can force the gaseous am- 'n'ipnia througlt'tlie condensers and effect its v I claim as new and desire to secure byLetters- Patent, is,

eondensati'orrtherein) will be counteracted.

by the pressure of ammonia gas entering the cylinder 8 by way of the pipe 18,the ressure thus created within the cylinder a ove the Weighted. piston 17 causing the latter to descend against the now diminished head of the column of liquid ammonia entering said cylinder by way of the pipe 6 and cansing'the tube 16 of the valve 13 to descend and cover more or less of the perforations 15 of post 14 and thus retard'or completely close the passage of liquid ammonia from the condensers to the expansion coils.

From the above it will be observed that my improvements utilize the unbalanced weight of a column of liquid ammonia to operate a delivery valve and pass accumulated liquid,-serving also to hold back enough ressure on the condensers to effect the liquef yin of the ammonia in them. It will also be 0 served that the liquid ammonia will be passed to the expansion coils as fast as it is produced in the condensers, irrespective of pressure, temperature or other external inuence. 1

Having fully described my invention what 1. In refrigerating apparatus, the combination with a condenser and an expansion coil, of means for utilizing the head or weight of liquid ammonia leaving the con denser to control the passage of said liquid ammonia from the condenser to the expan sion coil.

2. In refrigerating apparatus, the conib'i-Q nation with a condenser, an expansion coil, and means for forcing gaseous ammonia from the ex an'sion coil to the condenser, of means c'ontro led by the head or'weight of liquid ammonia leaving the condenser, for passing said liquid ammonia to the expansion coil as fast as it is roduced in the condenser.

3. In re igerating apparatus, the combination with a condenser, an expansion coil, a .55

compressor, a connection between the expansion coil and com ressorfand' a connection between the con enser and compressor, of a cylinder, -a valve therein, connections between said cylinder and condenser and between said'cylin'der and expansion coil,

1 pn'piston in said cylinder at one side of the ct and outlet for li u'id ammonia for op erating said valve, an a pipe communicating with the cylinder at the other side of said piston and connected with the the compressor and condenser.

4. In refrigerating apparatus, the combination with a condenser, an expansion coil, a compressor and connections between the expansion coil and compressor and between the compressor and condenser, of a pipe com- 'municating with the condenser for the pasof an outlet pi e for liquid ammonia communicating wit the condenser, an inlet pi e pipe between for liquid ammonia communicating with t e expansion coil, a cylinder communicating with said inlet and outlet, pipes, a valve said cylinder fgr controlling the passage of liquid 311111101118 from the outlet pipe of the condenser to the'inlet pipe of the expansion coil, a weighted piston connected with said valve, and a pipe connected with the cylinder near ,the end thereof farthest removedfrom the valve, said pipe being also connected with the-pipe whic pressor with the condenser.

6. In refrigerating apparatus, the combination'with a condenser, an expansion coil, a

compressor connected with the outlet of the expansion coil, and a pipe connecting the compressor with the inlet of the condenser,

an outlet pipe for the condenser, and an inlet pipe for the ex ansion coil, of means for utilizing an unba anced column of liquid ammonia to control the passage of liquid ammonia from the condenser to the 'ex ansion coil, said means comprising a cylin er connected with said liquid ammonia inlet and outlet pipes, a perforated tubular post within said cylinder between said inlet and outlet pipe connection, a tube to telescope with said post, a weighted piston within said cylinder and-car ing said tube, and a connection between t e cylinder at a point above the weighted piston and the ammonia gas pipe which connects the compressor with the condenser. I

In testimony whereof, I havesigned this Specification in the presence of two subscribing Witnesses.

FRANK A. RIDER. Witnesses:


connects the com.-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2443581 *Oct 30, 1944Jun 15, 1948Spoehrer Lange Co IncRefrigerant flow control means
US2579034 *Jun 8, 1945Dec 18, 1951Alco Valve CoMultiple response override for thermal valves
US3286482 *Jul 10, 1964Nov 22, 1966Carrier CorpApparatus for controlling refrigerant flow in a refrigeration machine
US4041982 *Jan 9, 1976Aug 16, 1977Kieley & Mueller, Inc.Double wall plug control valve
US4067361 *Apr 21, 1976Jan 10, 1978The United States Of America As Represented By The Secretary Of The NavySilent self-controlled orificial restrictor
US4540022 *Jun 1, 1982Sep 10, 1985Harry R. CoveChoke for drilling or production use
US5715704 *Jul 8, 1996Feb 10, 1998Ranco Incorporated Of DelawareRefrigeration system flow control expansion valve
International ClassificationF25B41/06
Cooperative ClassificationF25B41/062, F25B2341/063
European ClassificationF25B41/06B