DE1653578A1 - Liquefied gas pump - Google Patents

Description

DipL-Ing. H. ZOEPKE 7 OK1196

Patent attorney
Munich 12 - ßidlerstrasse 87

NV PHILIPS 'GLOEILAMPENFABRIEKEN, EINDHOVEN. / HOLLAND

vO / TH

for liquefied gases. "

It is known that liquefied gases are very often used in industry, especially in vacuum technology, e.g. for collecting, i.e. condensing, the vapors of undesired substances or more in general of gases whose condensation point is at a temperature higher than that of Boiling point of the liquefied gas used as a coolant.

It is more advantageous to

to circulate liquid gas in channels marked 109818/0427

owom *

PHN.1447 —2—

Surfaces to be cooled are in Fontakt than having to keep the gas in isolation vessels, their contents must be checked and replaced. Pumps are used to the special conditions of very low temperatures and easy evaporation of the pumped Liquids are adapted.

In such pumps the pumped

Liquid partially evaporate due to the heat generated by friction between the piston and the cylinder, which is supplied by conduction through the pump walls themselves from their parts in contact with the environment Heat, as well as the heat generated by compressing the fluid as it flows through the channels can be generated. The resulting oasis interferes with the good functioning of the pump.

In known designs of pumps for liquefied gases, the aim is on the one hand that To limit evaporation of the liquid and on the other hand the removal of the gases formed by evaporation to facilitate. For this one uses direct means, such as the presence of a clearance between the piston and the cylinder, which restricts the frictional heat and allows the steam to escape, or indirect means, like the use of an auxiliary element, which the Pressurizes fluid throughout the system, reducing its evaporation.

The liquefied gas pump according to the invention is designed for direct ironing

109818/0427

commercially available bottles with liquefied gas, from Devices with a coolant circulating therein for / .catching vapors or other devices, which intend to achieve or maintain very low temperatures. Pie pump according to the invention differs from the existing pumps by several characteristics, which the liquid losses in to a high degree.

The PumOe for liquefied gas, which is located in a container, has a piston that is connected to a reciprocating piston rod and is received with very little clearance in a pump body which is immersed in the liquefied gas can be and in which a valve system is the supply of the gas in the aforementioned pump body and the pressing out of the same makes possible, and according to the invention it is characterized in that the Pump has two chambers coaxially surrounding each other and the piston rod, of which the first chamber is communicates at one end with the pump body and at the other end with an outlet which is connected to an outside circulating system for the liquefied liquid located half of the pump Gas can be connected, and the second chamber has at least one opening at one end which this chamber communicates with the container mentioned, and has an inlet at the other end, which is also connected to the one located outside the pump Circulation system can be connected, as well as an outlet that is above the inlet and into the atmosphere flows out.

In this way it is achieved that the

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16S3578

PHN.1447 -4-

Liquid continues to flow after entering the first chamber, without any significant pressure being necessary. In the pump according to the invention can by amounts of liquid evaporated from the outlet of the second chamber be discharged without any clearance being necessary between the basket and the cylinder. Such a margin would greatly reduce the useful performance of the pump.

Before the liquid that outside

the circulation system located in the pump flows through through the first chamber, the liquid flowing back from the mentioned system into the second chamber is cooled. This prevents evaporation of the liquid located in the first chamber by the line heat coming from outside. This double chamber construction also reduces heat conduction to the liquid in the container.

It is known that regardless of

Measures that are taken to keep the various parts of such a pump apart from the environment isolate, it is inevitable that part of the pumped liquid evaporates and immediately passes over the PumO seals escapes to the outside. So it comes to limit the number of seals required for such a pump as much as possible. the Pump according to the invention has two seals that delimit a chamber in which the vapors of the verpunroten Liquid can be partially collected and heated

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BATH ORIGINAL

PHN.1447

m * * ~ \ aw

can, so that a slight overpressure arises in this chamber, which limits the loss of steam leaking out.

The pumped liquid evaporates

partly when flowing through the circulation system located outside the pump and when cooling the wound along which it flows. After flowing through the system, the liquid and the vapor are collected again. The liquid part returns to the container with liquid gas via the second of the double chimneys mentioned above. The vaporized part is introduced through the second outlet, which is attached at a suitably selected high point, into a closed insulating space which surrounds most of the pump part located outside the liquid container. The cold steam cools this part of the pump _f so that the temperature gradient between the pump parts outside and inside the container is reduced and losses due to conduction heat inward will be lower is particularly dry ", so that cooling without ice formation occurs on this pump part,

Dae used to build the pump Metal naturally has the lowest possible strength, in order to prevent heat conduction, however, the different parts occurring mechanical forces adapted «a. The metal must be compared to the pumped

109818/0427

PHN.1447

-6-

Liquids have a strict neutrality. In stainless steel with the commercially known designation 1o / o, which contains about ο $> chromium and $ nickel and whose conductivity is one of the lowest among the usual metals, can advantageously be used for this purpose.

The pump according to the invention can be in contact with the liquid gas without any lubrication 2 parts work so that. Each arbitrary Gas can be used.

The. Invention is based on the drawing ns-her explained, in which, for example, an äusführungsiorin a P-uap "is shown, which is particularly is convenient to operate, since it can simply be dipped into the gas bottle that is sold in stores. Ss showf

Pig, 1 a longitudinal section through sine fumps for liquefied gas, dia partially in a immersed laolier container filled with liquefied gas, is j

Pig, 2 in section and on a larger scale a section of the Pig pump. 1;

Pig. 3 also in section and in

larger scale the double chamber for the outgoing ones and returning fluids, as well as the manner in which the various tubular items are made the pump are connected to each other «

For convenience of description it is

the Pumoe in the figures is divided into five sections I, II, III, IV and V , 109818/0427

PHIT. 1447 -7- *

ϊ / ie from Pig. 1 is the

Puin :: e partially immersed in liquefied gas that is in a normal vacuum flask 2. SUBSCRIBE? I (see also Fig. 2).

The lower part of the pump, which is

Located in the liquefied GPS, contains a piston 3 with a piston rod 1ö, from the body of a ball valve 3a is formed with channels 3b. The piston 3 is displaceable in a cylinder 4, the length of which the Stroke of the piston 3 corresponds. The cylinder 4- is down

Ir

limited by another ball valve 5, which is fixed by shrinkage in the cylinder. SECTION II.

On the cylinder 4 is due to shrinkage

a stainless steel pipe 6 miserly wall thickness attached, which forms the outer casing of the pump. The other individual parts are pontooned in the pipe 6, with separating rings at different heights the separations between the different sections of the point arise. So is the separation between the sections II and IH the pipe 6 attached by shrinkage on the outer surface of a ring 7, cer in one such a height is attached in the pump body that he The level of the liquefied gas surmounts when the bottle 2 is completely filled. The Schwunöverb: ndung is e.g. obtained that the metal of the pipe 6 by means of a pressure roller M in a constriction Ta of the mentioned Ring is re'-rubbed (see Fig. 3J,

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PHNM 447 -δ-

SECTION III.

The ring 7 has a tapered part 8 (see the detail in $ lg. 3), on which a tube 9, which is also smaller in wall thickness, is attached by shrinkage, which is also fixed at the top by shrinkage on a tapered part 10 of a ring similar to the ring 7 . The two tubes 9 and 6, the latter of which is again attached to the outer surface of the ring 11 by means of a groove and constriction, delimit two coaxial chambers. The outer chamber lying between the tubes 6 and 9 is at the ring 11 with an inlet

12 provided, which is soldered to the tube 6 and with a lying outside the pump, not shown Umlaufs3'-stem can be connected. The pipe 6 in this Section III is provided with holes, one of which

13 is provided in the upper portion above the inlet 12 and on which an outlet is soldered while the other holes 14 and 15 are provided in the lower portion.

ABL-CHIiITTIV. . .

The tube 6, which is fastened on the one hand on the ring 11 and on the other hand on a ring 16 which represents a bearing and is provided with a packing sleeve for sealing around the piston rod 1θ, forms another chamber to which an outlet 17 is soldered which is intended for connection with the circulation system located outside the Fum.-e. SECTION? V.

This Abt-oi-rtitt consists of one of the ih0ft1ft / flO9 BAD ORIGINAL

'1663578

PHN.1447

Tube 6 formed the chamber surrounding the piston rod 18 which is closed by the -Diciitungslager 19 at the top.

The piston rod 1 &, which transmits a reciprocating motion to the piston 3, is by an electric motor, shown schematically powered with transmission.

The pump part lying outside the container 2 is insulated by a space 21 filled with a thermally insulating material. One uses a polyamide for the walls of the tree 21 and Sohamnpoly styrene, as felling. The lower surface of the Raurass 21, which forms the support surface of the pump on the neck of the container 2, is provided with an insulation 22, the sides of which come into contact with the pipe 6 are provided with a bevel 23, whereby the heat exchange between the bore 6 and the * ^l ± ng remains limited.

The operation of the pump is as follows: after the system has passed through valves 3 and 5, the liquid rises in section II in a space delimited by 6 and piston rod 18 and in section III in that of the Bofcr 3 and H "oll? <? nst-3Xige 1b limited Hauffi. the liquid then exits through the tile pump Auflasarohr 17 TUs according äem Pessieren Ringas 11. the liquid New York Convention ÖAS gasförmie-e Kittel kekran then through the Binlasrsrohr 12 from the circulation system located outside the pump into the Jr

-j PuKpe 2uruck. Since »liquid funds happen in the Ab- S

ο cut III swisehei * -fm Twhvzn 6 and 9 lying second

and is via the linear 14 and 13 in the container

PHK.1447 -10-

2 caught. The cold gaseous smock escapes through outlet 13 and flows through space 21, from which it escapes into the atmosphere.

In section IV of the pump there is a liquid medium and some gaseous medium, which has arisen, for example, from internal friction. It is inevitable that the gaseous agent penetrates through the bearing 16 into the chamber of the section V. Part of this chamber is in contact with the environment. Y / erc the bearing 13 the mentioned chamber is adequately closed off * by the heating of the: gaseous medium t-yr-Ίν, ". -In Xei ^ nter overäTack, which a new-c inst-r ':'·;; cn of the gaseous coat in w9santlioL «a Hasse hir. \, - ir .. holds, Li i, v -; - 2re? alec durtO len outlet disappears; ··

Sound ■ ;; .- ::. both :: r i: i «o« r pump

Would sightings wi: -xt die e -. '. Nc, d: l *? of the camp Ιέ, ii). t-liier -iiiiülilten A-tr_ ■ - _r iiare unt. oil «» .tzdere, the de-; camp 19? in a 5I ¹ ^ ulerature, "Ig almost equal to the ZiTn ^ erteaosrature is" ... ':;ii'sequence of servants -different Y $ rj: -. r? j.tni8se i'arüi mau: Mr α3β ers-ite · j> iohtung Tcrtfcir ..! * - 'imprisonment lOl ^ ts trrfl ^ ^ ^ s oräth and use aie sweite neoprene, isoprene results in a better seal El ₄ S polytetrafluoroethylene, but in the realized here ratios reduces the presence of over «Druckkanjüer the imperfections of the latter.

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Claims (3)

PHN.1447 -11- ' J Pum: e for liquefied gas, which is located in a container, with a piston that is connected to a piston rod that can be moved back and forth and is accommodated with very little clearance in a cylinder that can be immersed in the liquefied gas and in which a valve system makes it possible to feed the liquid gas into the mentioned cylinder and to press it out, characterized in that the pump has two chambers coaxially surrounding each other and the piston rod, the first chamber of which at one end with the pump body and at the the other end is in communication with an outlet that can be connected to a circulation system for the liquefied gas located outside the pump, and the second chamber has at least one opening at one end through which this chamber is in communication with the boiled container, and at the other end has an inlet which also connects to the circulation system located outside the pump ssbar, as well as an outlet that is above the inlet and opens into the atmosphere. 2. Pump according to claim 1, characterized in that the pump has a third the Kolren- The chamber surrounding the Q rod is supported by two seals oo limited v / ird, one of which is the third chamber co separated from the ice and the other the third lambs ^ from 'ier environment separates, never being a third chamber , 4 te- -v.'eise .η an isolated envelope lies ^ t. PHN.1447 -12- 3. Pump according to claim 2, characterized in that the adjoining the second chamber The outlet for cold steam opens into the above-mentioned envelope. 18/0427 ^8AD ORIGINAL