US3421345A

US3421345A - Pressure control,especially in connection with the treatment of textiles

Info

Publication number: US3421345A
Application number: US561618A
Authority: US
Inventors: Gunter Schiffer; Karl-Peter Lopata
Original assignee: Joh Kleinewefers Soehne KG
Current assignee: Joh Kleinewefers Soehne KG
Priority date: 1965-07-02
Filing date: 1966-06-29
Publication date: 1969-01-14
Anticipated expiration: 1986-01-14
Also published as: NL6602731A; DE1460415A1; DE1460415B2; GB1099166A; NL146233C; CH454787A

Description

G- SCHIFFER El' AL PRESSURE CONT 3,421,345 EOL, ESPECIALLY IN CONNECTION WITH TEE TREATMENT OF TEXTILES Filed June 29, 1966 `Iam. 14, 1969 Figa United States Patent() U.s. cr. ss-s im. ci. non 39/12; non 47/06; ma) 25/16 8 Claims ABSTRACT F THE DlSCLOSlURE A device for iinely controlling the sealing pressure in a hydraulic or pneumatic sealing diaphragms, for use in connection with the inlet and outlet slots for the goods in pressure dampers for treating textiles, said sealing pressure being controlled by the inner pressure of the boiler, in which said device comprises a double acting fluid pressure cylinder with a piston reciprocable therein and having one side acted upon by the inner pressure of the pressure damper Whereas the other side of said piston is acted upon by the pressure medium of the sealing diaphragme, the required low over-pressure for the sealing lips being produced by an additional pressure acting upon said piston or piston rod connected thereto, and the required correction of the sealing pressure necessitating the varying frictional values of the goods, and/ or the impregnated liquor being effected by a control device controlled by the tension of the goods in the pressure damper.

The present invention relates to a pressure control, especially for use in connection with the treatment of textiles. More specifically, the present invention concerns passage control devices on pressure containers for treating Wide textile material. In such pressure containers which are also known as pressure dampers, textiles passing through in a continuous manner are at an inner pressure of several atmospheres above atmospheric pressure subjected in a steam or gas atmosphere to a treatment, for instance to a bleaching operation, a bucking operation, or other operations.

ln order to permit a `pressure-tight introduction and withdrawal of the goods from such pressure containers, devices have been suggested which comprise primarily hydraulically or pneumatically actuated hose-shaped diaphragms which engage the goods passing therethrough from both sides and thus form a separating wall between the pressure in the container and the atmosphere.

In this connection, the pressure in the sealing diaphragrns must exceed the pressure in the container by a very slight amount only, as for instance from 0.1 to 0.5 atmospheres above atmospheric press-ure. ln order to adapt the diaphragm pressure to the changing inner pressure in the container, it has been suggested automatically to control the said inner pressure in conformity with the container pressure through the intervention of a pressure conduit in such a way that the pressure conduit from the pressure damper to the sealing elements has interposed therein a pressure transmitter or control which in view of its adjustment will maintain the pressure in the sealing elements always slightly higher than the pressure in the pressure damper.

Experience has shown that also the above arrangement does not permit a trouble-free operation. On one hand, with apparatuses of the just mentioned type, the required additional pressure of less than 100 -millimeter water column cannot be adjusted sensitively enough and so that it will not change because the friction coefficients of the 3,421,345 Patented Jan. 14, 1969 ICC pressure reducer overcome the ad'ustin forces and change l in the course of time. On the other hand, the pressure reducers do not respond to the changing roughness and thickness of the pieces of -material sewn together nor to the changing sliding factors of the liquor by which the oncoming goods have been impregnated, As a result thereof, the resistance at the sealing elements and consequently the pulling tension in the goods change while in some instances also steam may escape when the sealing elements no longer withstand the inner pressure of the container.

It is, therefore, an object of the present invention, to provide a control device of the above mentioned general type which will overcome the drawbacks outlined above.

It is still another object of this invention to provide a control device according to which the pressure transmitter will be provided with means for holding the intermediate pressure constant.

Still another object of this invention consists in the provision of a control device by means of which the various frictional resistances can be properly controlled.

These and other objects and advantages of the inven tion will appear more clearly from the following specification in connection with the accompanying drawing, in which:

FIG. 1 diagrammatically illustrates partly in section a control arrangement according to the present invention.

FIG. 2 shows a side view of a portion of FIG. l.

FIG. 3 illustrates a slight modification of the fine pressure control in the sealing diaphragms.

The above outlined objects have been realized according to the present invention by means of a double-acting pressure cylinder piston system in which the piston has one side thereof subjected to the inner pressure of the damper, whereas the other piston side acts upon the pressure medium of the sealing lips while the required slight overpressure for the sealing lips is produced by an additional pressure acting upon the piston rod and preferably caused by removable weights. The correction of the sealing pressure which is required by the varying frictional values of the goods, of the impregnating liquor and in View of other inlluences, is effected through a throttle or the like through a control device which in its turn is controlled by the tension of the goods in the pressure damper.

This arrangement brings about that the additional pressure for the sealing lips will remain constant also at a minimum adjustment and independently of the inner pressure of the pressure damper. Furthermore, the changes in the pulling tension in the goods as caused by different frictional values of the goods, of the impregnating substances, or for instance by a sudden reduction in the pressure, as due to condensations, will immediately be compensated for by a pressure adaptation in the sealing lips.

Referring now to the drawing in detail, the arrangement shown therein comprises a pressure damper 1 esigned for a high inner pressure. The pressure damper 1 is provided with `a device 3 for passing the goods therethrough in a pressure-tight manner. The device 3 comprises two pressure diaphragms 2. The pressure damper l furthermore comprises a plurality of deviating rollers 4 for looping the goods therearound, and also comprises a driving roller system 5. The passage device or control which seals the goods passing therethrough between the two pressure diaphragms 2 is acted upon preferably by a hydraulic pressure. The said hydraulic pressure is furnished by a pump 6 located in a circuit comprising the feeding line 7, the pressure transmitter 8, the return conduit 9, the diaphragms 2, the control throttle 10 and a cooling device 11. The cooling device is necessary in order to be able to cool the termally highly stressed sealing diaphragms 2 through the pressure iiuid circuit.

The pressure transmitter 8 comprises a cylinder 8a having reciprocably mounted therein a double-acting piston 12. Piston 12 is acted upon from both sides, namely at one side by the inner pressure of the damper 1 which pressure is conveyed through a conduit 14, and on the other side by the pressure medium in the closed pressure circuit of the diaphragm seals 2 as conveyed through conduit 9. The cross section of pressure piston 12 is so selected that the inner pressure in the sealing lips will be approximately equal to the inner pressure of the pressure damper 1 but will under no circumstances drop below said last mentioned inner pressure. Inasmuch as experience has shown that for purposes of obtaining a sealing effect the pressure in the sealing diaphragms 2 must only slightly exceed the pressure in the pressure damper, it must be possible to adjust the pressure in the sealing diaphragms 2 in `a precise manner by a fine sensitive device at the pressure transmitter 8 inasmuch as this is not possible by means of the pressure transmitter alone in view of the changing magnitude of the surfaces engaged by the sealing diaphragms 2 and in view of the piston friction in the pressure cylinder 8a. According to the present invention, this ne adjustment is effected by a precisely `adjustable additional load on piston 12, preferably by placing weights 17 upon the piston rod 13 protruding from the pressure cylinder 80.

Inaslnuch as the thickness of the goods and the roughness of the individual pieces sewn together change while the goods Amove in a continuous manner, and since also the sliding factor of the respectively employed impregnating liquor has dii-ferent values, the inner sealing lips are subjected to varying pressure. This would normally, when the goods are pressed to an increased extent, result in an increased tension of the goods in the looped area within the kettle or when the sealing lips press upon the goods to a lesser degree, would result in an escape of steam and thereby in a drop in the pressure. inasmuch as the pressure transmitter 8 operates only in conformity with the inner pressure in the kettle, these influences are not taken into consideration. According to the present invention, the inertia-free control of the sealing pressure of the sealing diaphragms 2 is effected by a feeler device which is controlled by the tension of the goods in the interior of the kettle 1. In this connection it is highly advantageous to employ a floating jockey pulley 21 which is carried by a lever 21a keyed to a shaft 23 extending through a pressure-tight bearing 24 and carrying a sprocket wheel 25. Sprocket wheel 25 is by means of a chain 26, a sprocket wheel 27 keyed to a shaft 28, a sprocket wheel 29 and a chain 30 drivingly connected to a sprocket wheel 31 which in its turn is operatively connected to the valve member.

The pressure transmitter 8 or the pressure control in the pressure circuit of the sealinU diaphragms which pressure control is controlled by the tension of the goods, could also be employed by themselves, but in the second instance no suiiicient safety for a closing of the sealing lips would be obtained when, for instance, due to a disturbance in the movement of the goods, the said floating jockey pulley Z1 fully opens Athe control throttle. In such an instance, in view of a shock-like evaporation it could occur that the pressure damper breaks, aside from the fact that the operator may be endangered by the escaping steam and its eifect. On the other hand, if the closing pressure of the sealing diaphragms 2 would be increased, the tension of the goods will be increased to such an extent that the goods would tear and the operation would have to be stopped for a longer period of time in order to again introduce the goods. By combining the rough control by the pressure transmitter 3 with the tensionV sensitive control by means of the control throttle 10, disturbances of the above mentioned type will be safely avoided.

According to a further development of the present invention, the piston rod 13 is hollow with through bores l5 at the lower end of said piston. The condensate collecting above the piston can pass through said ybores 15 and the hollow rod 13 into a conduit 16 for discharging the said condensate.

It is, of course, to be understood that the present invention is, by no means, limited to the particular arrangement shown in the drawing but also comprises any modifications within the scope of the appended claims. Thus, instead of employing weights 17 to be placed upon the piston rod 13, it is also possible to cause a pneumatic pressure which is finely adjustable by a pressure control Ztl to act through a pneumatic piston 1S upon the piston rod 13 of piston 12.

It will also be appreciated that while the invention has been described only with the sealing of the inlet passage through which the goods enter the container, damper or kettle 1, the same arrangement is applicable for the sealing of the exit passage through which the goods leave container l.

What we claim is:

1. In combination with treatment vessel having passage Imeans including diaphragm means for conveying flat textile material from the outside of said vessel into said vessel for processing therein by contact Iwith a fluid under pressure in said vessel: pressure fluid operable cylinder piston means comprising a cylinder and a double-acting piston reciprocable in said cylinder, first conduit means leading from said vessel into a portion of said cylinder at one side of said piston to convey the fluid pressure prevailing in said vessel to one side of said piston, second conduit means in flow communication with the other side of said piston for conveying pressure fluid to said other side of said piston and from said other piston side to the diaphragm means to thereby control said passage means, auxiliary means operatively connectable to said piston for selectively exerting pressure thereon in the same direction in which said piston reacts to pressure acting on said one side thereof, and control means including i'irst means arranged in said vessel and also including second means operatively connected to said irst means and arranged in said second conduit means and operable in conformity with the tension of the material being processed in said vessel to control the fluid pressure acting upon said diaphragm means.

2. An arrangement according to claim l, in which said second conduit means forms a closed circuit including a pump with a suction side and a pressure side and also including a feeding line leading from said pressure side into said cylinder for conveying pressure fluid to said other side of said piston, said second conduit means also including a return line leading from a portion of said cylinder at said other piston side to the suction side.

3. An arrangement according to claim 1, in which said diaphragm means are interposed in said return line.

4. An arrangement according to claim 1, in which said auxiliary means is formed by detachable weight means.

5. An arrangement according to claim 1, in which said auxiliary means is formed by additional pressure fluid operable cylinder piston means operatively connected to said rst mentioned pressure fluid operable cylinder piston means.

6. An arrangement according to claim 1, in which said control means includes: jockey roller means arranged inside said vessel and adapted to be passed over the material being processed in said vessel, lever means pivotable in said vessel and supporting said jockey roller means, and throttle valve means interposed in said second conduit means and operatively connected to said lever means.

7. An arrangement according to claim 2, which includes cooling means associated with said closed circuit for cooling the iluid passing therethrough.

8. An arrangement according to claim 1, in which said one piston side has connected thereto a hollow piston rod provided with transverse bores arranged at least near said 6 one piston side for collecting condensate and selectively FOREIGN PATENTS discharging the same. 14,444 9/1962 Japan References Cited WILLIAM L. PRLCE, Primary Examiner.,v UNITED S ATE PAT NT T S E s U.S. Cl. X.R.

5 3,299,676 1/ 1967 Fujihashi 68-5 4 242 3,343,379 9/1967 Duis et al. 68-5 3