US1977130A - Gas holder with constant pressure - Google Patents

Description

Oct. 16, 1934. Q H

GAS HOLDER WITH CONSTANT PRESSURE Filed March 23, 1933 H. f ZLNTNL By' Patented Oct. 16, 1934 PATENT OFFICE,

v 1,977,130] GAS HOLDER WITH CONSTANT PRESSURE Heinz Otto Hohl, Vienna, Austria, assignor of one-half to" the firm .l aul Haack, Vienna, Austria, .a firm composed of Wilhelm Haack and JApplication March 23, 1933', Serial No. 662,316

. I In Austria May 17, 1932;

i 8 Claims. (Cl;; 23 -259) Liquid sealed gasholders haveheretofore been subject to the disadvantage that the. gas pressure does not remain constant during discharge but gradually decreases. Consequently experil. mental work which calls for a uniform current of gas for a considerable length of time, such,

for instance,-, as combustion analysis, calorific tests of gases and so forth, requires constant attention for regulation of the gas pressure. How- 10 everufor laboratory use, gas storage holders are already known which maintain a constant pressure, but their manipulation is normally somewhat difficult, particularly during charging.

The presentv invention relates to an improved 515i constant pressure gas-holder of, the kind comprising a gas compartment-anda liquid compartment which is incommunication with the former by apipe extending into said gas-compartment and terminating 'close to the. bottom thereof.

:10 Theessential feature of the gas-holder according to the present invention consists in that the liquid compartment is constructed so as to act likea Mariottes bOtiIlByWhlChCQHSiStS of asealed bottle having: an outletin its lower'part and an atmospheric tube dipping below the surface of the liquidtherein, so that,-aft er-liquid has been discharged until air bubbles into the bottle through the atmospheric tube, the liquid discharges'under a constant pressure and at a constant speed which dependsupon-the level of liquid between the bottom of the atmospherictube and the outflow opening ofthegb'ottle, the'pressurev and speed of outflow naturally-decreasing as the atmospheric tube is lowered towards the outflow opening of the bottle, In the case of this invention, the communication pipe ,e'xtendinginto the gas compartmentiis provided with an overflow pipe discharging within said gas compartment. Preferably an automatically operating cut oif device is-arranged in an airventofthe cover o'r stopp 'er ofthe liquid compartment and also, if desired, in the communication pipe and inthe overflow pipe The overflow pipe branches ofi irom the side of the communication pipe, oris arranged to surround thesame Somem'odes of carrying. out'thepresent invention are illustrated on, the, accompanying sheet ofldrawing in which Fig. 1 shows the gasholder in sectionalelevation. Figs. 2, .3 and 4 illustrate different constructions of the communication pipe and overflow pipe disposed within the gas compartment. H v The gascompartment or gas, storage compartment lIis closed by a removable cover or stopper .55 2, from which branches ofi-a. gas pipe ,4, controlled by a stop valve 3. "A pipe passes gastight through the. cover 2 and terminates in the gas compartment lnear the floor thereof, Some distance from its bottom end, the pipe 5 is provided a flap valve- 6, which permits the admission ofthesealing liquid from the gas compartment 1 into the pipe 5' but prevents the discharge of saidliquid from. said pipe 5. In the construction shown in Fig. 1, an overflow pipe '7 branches ofl from the communication pipe 5 above the valve Sand terminates near the cover 2.v A flap valve 8, arranged in-said overflow pipe, permits the passage of the sealing liquid from the pipe 5. into the pipe 7. The liquid compartment 9, con:- taining the sealing liquid, is arranged above the gas compartment 1 and is in communication therewith by the pipe 5. This compartment 9 is closed by a removable stopper orcover 10, through Whichpasses gas-tight an air suction pipe 12, which may be provided with a stop valve 11 and extends close toithe floor of the liquid compartmerit 9 and renders possible the characteristic action of the Mariottes bottle. Avshort pipe 13 is.connectedrwiththe cover and provided with a flap valve 14, permitting'the escape of air from said compartment 9 but not the admission of air into the latter. A flexible pipe or thick-Walled rubber tube is used in place of the pipe 5, which renders possible the rearrangement of the sealing liquid compartment 9, in case the device is used for the discharge of gas at diflerent pressures. This is a requirement also in the case of a gas compartment with gases at atmospheric pressure, as it will be described hereinafter.

' If it is desired to charge the device with sealingliquid, the cover 10 of the compartment 9 is removed, while the stop valve 3 of the compartment 1 is opened andnow the sealing liquid flows through the communication" pipe 5 thereby shutting the flap valve 6 of the latter and opening the flap valve 8 of the, overflow pipe 7. Now the liquid-flows over the top of the latter into the gas storage compartment 1. The air, displaced in the latter by the sealing liquid, escapes by Way of the pipe 4. Sealing liquid is supplied until it begins to pass out through the'pipe 4. Now the stop valve 3 is shut andso much sealing liquid is still filled in untilit extends'somewhat above the bottom end of the air suction pipe 12, which with its cover ,10 is mounted in position. Now the gas compartment is ready for the charging with gas. This maybe carried out in different ways, which depends on Whether the gas to be supplied is or is not subjectedto a higher pressure.

The supply with gas at a higher pressure is carried out in the following mannerz-The reducing valve of a steel bottle filled with gas under high pressure is secured to the pipe 4, and now the stop valve 3 and subsequently the said reducing valve are opened. Gas flows into the gas compartment 1 and ultimately produces an overpressure therein. Thus the flap valve 8 is held shut, while the valve 6 is opened by the sealing liquid rising in the pipe 5. Now the liquid flows into the compartment 9 and compresses the air within the latter to such, an extent until the valve 14 is opened and escapes by way of the vent 13. The reducing valve of the steel bottle as well as the stop valve 3 are shut andthe steel bottle is removed, if the storage compartment 1 is filled with gas and practically the entire sealing liquid has been forced into the compartment 9.

Now the gas within the compartment 1 by opening the stop valve 3 and allowing the es-' cape of such quantity of gas until air bubbles arise in the sealing liquid at the bottom opening of the air suction pipe 12. Thereby the following has taken placez-In View of the escape of gas from the gas compartment 1, the gas-pressure in the latter sinks and therefore the sealing liquids flows from the compartment 9 into the compartment 1, whereby partialvacuum is pro-' duced in the compartment 9 above the liquid. Therefore the valve 14 is closed automatically and air enters by way of the pipe 12 into the compartment 9. Even in the event of a further discharge of gas, the pressure remains constant because now the characteristic efiect of the Mariottes bottle is produced. This constant pressure is the result of the level-difierenceI-I.

A vacuum pump- (water jet pump) is secured to the pipe 13 if the gas is subjected to atmospheric pressure for instance if the compartment 1 is to be filled with air. The stop valve 11 of the air suction valve 12 is shut, while the. stop Valve 3 or" the pipe 4 is opened, and now air is sucked out of the compartment 9. The sealing liquid rises in the latter and air passes through the pipe 4 into the compartment 1. The constant pressure is set automatically whenever the stop valve 3 is shut, the pump is removed and the stop valve 11 is opened. Further the gas may be charged in the following manner:The compartment 9 operating in the manner of Mariottes bottle is disposed lower than the compartment 1 and a flexible pipe, rubber tube or the like establishes communication between both compartments. A vacuum is produced in the compartment 1 owing to the siphon-action, so that the same is charged with air. The constant experimental pressure is obtained by lifting or adjustment.

The arrangement of the valves in the gas storage ccmpartment 1 can be simplified considerably. As shown in Fig. 2 the overflow pipe 7 and the communication pipe 5 are combined toform a U-shaped pipe and the non-return valve 15, common to both pipes, is disposed close above the floor of the gas storage compartment 1. In'the embodiment shown in Fig. 3, the overflow pipe '7 is arranged around the communication pipe 5 and a non-return valve 16 is disposed in the bottom ward until the level in the latter has dropped below the outer level. Now the non-return valve gives free the opening, so that the liquid flows outside into the overflow pipe and thus the whole .liquid is pressed into the compartment acting in the manner of Mariottes bottle. Also in these constructions the adjustment to constant pressure is effected by relieving the overpressure, whereby the non-return valve is closed again and the liquid is forced to overflow.

In the construction shown in Fig. 4, the overflow pipe 7 is in the form of a float, which surrounds freely slidable the connection pipe 5. The bottom end of this overflow pipe rests on the floor of the gas storage compartment '1 and is provided with an enlargement acting as float. The con-' centric location between the two pipes 5 and 7 is secured by means of guides 17 arranged on the inside of the-overflow pipe 7*. The bottom end of the latter dips into athin layer of mercury 18 on the floor of the compartment 1 and thus safeguards'a good sealingof said bottom end. If gas is discharged, the overflow 7 rests on the floor of the compartment 1 and therefore the sealing liquid entering by way of the connection pipe 5 flowsover the top rim" of the overflow pipe '7 and into the compartmentl. When charging with gas, the liquid in the overfiowjpipe is forced into the compartment acting in the manner of Mariottes bottle, whereby the level within the overflow pipe sinks'below the outside level and thus said pipe is lifted from its seat. Now liquid can flow in. 7

What I claim is:--

1. In a gas-holder, comprising a gascompartment, a liquid compartment in the form of Mariottes'bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter just above thefloor thereof, the provision of an overflow pipe arranged within said gas compartment and in communication with said communication pipe and terminating in said gas compartment above its highest liquid level.

2. In a gas-holder, comprising a gas compartment, a liquid compartment in the form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, the provision of an overflow pipe arranged within said gas compartment andbranching off from said communication pipe and terminating in said gas compartment above its highest liquid level.

3. In a gas-holder, comprising a gas compartment, a liquid compartment in the form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, the provision of an overflow pipe arranged within said gas compartment around said communication pipe and terminating in said gas compartment above its highest liquid level.

4. Gas-holder with constant pressure, comprising in combination a gas compartment, a liquid compartment in the'form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, a cut-off device in said communication pipe, an overflow pipe arranged within said gas compartment and in communication with said communication pipe and terminating in said gas compartment above its highest liquid level, and a cut-off device in said overflow pipe.

5. Gas-holder with constant pressure comprising in combination a gas compartment, a liquid compartment in the form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, an overflow pipe arranged Within said gas compartment and branching oil from said communication pipe and terminating in said gas compartment above its highest liquid level, and a shut-off device arranged at the lowest place of said pipes.

6. In a gas-holder, comprising a gas compartment, a liquid compartment in the form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, the provision of an overflow pipe in the form of a float arrangement within said gas compartment around said communication pipe and resting on the floor of said gas compartment and terminating in said gas compartment above its highest liquid level.

'7. In a gas-holder, comprising a gas compartment, a liquid compartment in the form of Mariottes bottle, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter above the floor thereof, the provision of an overflow pipe in the form of a float arrangement within said gas compartment around said communication pipe and dipping into mercury on the floor of said gas compartment and terminating in said gas compartment above its highest liquid level.

8. Gas-holder with constant pressure, comprising in combination a gas compartment, a liquid compartment in the form of Mariottes bottle, a vent in the lid of the same, an automatically operating cut-on device in said vent, a communication pipe branching off from said liquid compartment and extending into said gas compartment and terminating in the latter just above the floor thereof, and an overflow pipe arranged within said gas compartment and in communication with said communication pipe and terminating in said gas compartment above its highest liquid level.

HEINZ OTTO HOHL.

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