DE904620C - Method and device for maintaining the liquid pressure in pressure cookers - Google Patents

Description

Method and device for maintaining the fluid pressure in pressure cookers The invention relates to pressure cookers for sterilization and to thereafter Cooling of food stored in closed vessels in a liquid under a pressure that is greater than the specific vapor pressure at the temperature, which is sterilized, and the subject of the invention is a. Procedure for Maintaining the pressure in the liquid both during the sterilization as well as the cooling process or possibly only during one of these processes.

According to the invention, the pressure in the liquid is maintained by that the liquid is directly or indirectly exposed to the action of vapor pressure which is then determinative for the working pressure in the pressure cooker. The steam can expediently be taken from the factory boiler through a reduction valve will.

The steam can be fed directly to the upper part of the pressure cooker, so that a cushion of vapor is formed on the surface of the liquid in the cooker, which, if it has sufficient volume, fluctuates in pressure because of its elasticity in the liquid during operation, which always occur easily can, for example, during the transition from sterilization to cooling.

The steam can also be released by means of a piston that is inserted in the steam line switched cylinder is slidable, or by a water seal on the Soak liquid in the cooker. Have the latter two arrangements the advantage that the steam has the upper Layer of liquid in the cooker is not heated directly, which heating affects the circulation of the liquid and adverse to even heat transfer to all of the vessels in the cooker can act.

The steam can also be fed to a dome arranged on the cooker be, whereby one in order to relatively small contact area between steam and To achieve liquid and therefore small heat transfer, the liquid something can reach up to the cathedral. The steam can also be in a special container are supplied, which is in an open pipe connection with the cooker and which is expedient can be dimensioned so that, after the sterilization is complete, the warm sterilizing liquid can accommodate, which is pushed over by the supplied cooling water into the container. Such a special container, in which a determinant for the working pressure in the cooker Vapor pressure or air pressure is maintained; is in the patent application O. i i96 / IVa 53c placed under protection, both for sterilization in heated Liquid as for steam sterilization under positive pressure.

The cooling can be carried out as usual by supplying cooling water under Pressure happened in the bottom of the cooker. Where the steam for maintaining the Pressure is supplied directly to the top of the digester, the outlet pipe for the warm sterilizing liquid under the normal surface of the liquid connected in the cooker, so that you can also use the steam cushion during the cooling process can retain on the liquid.

The drawing shows schematically a. Pressure cooker represent at which Arrangement for supply of steam directly onto the surface of the liquid in the Kocher is hit.

i denotes the pressure cooker in which the sterilizing liquid up to the level marked 2. The steam is passed through a line 3 supplied by a steam boiler and its pressure in the reduction valve 4 on the reduced in the cooker desired working pressure, whereupon the steam through the Line 5 is fed to the top of the cooker so that a cushion of steam is on the surface the liquid is obtained. One of the pipe 3 is provided with a shut-off valve 6 Line 7 branched off for the supply of heating steam to the liquid in the digester. 8 denotes a supply line for cooling liquid provided with a shut-off valve 9 and g a discharge line provided with a shut-off valve i z for the pressure cooker.

For removing the sterilizing liquid after the sterilization is finished an outlet tube is arranged which opens below the surface of the liquid, so that there is a cushion of steam on the surface of the Can retain fluid. The warm sterilizing liquid can be used in a known manner Way to be pressed into a hot water tank, from which they are in the pressure cooker can be returned for use in subsequent sterilization.

Claims (4)

PATENT CLAIMS: i. Process for maintaining the liquid pressure in pressure cookers for sterilization and subsequent cooling of foodstuffs accommodated in closed vessels in pressurized liquid, characterized in that the liquid is directly or indirectly exposed to the action of a vapor pressure which is necessary for the working pressure in the cooker both during the Sterilization rather than during the cooling process or possibly only during one of these processes is decisive. 2. The method according to claim i, characterized in that the steam is fed directly to the stove, so that a cushion of steam on the surface .the Liquid is formed in the cooker. 3. The method according to claim i and 2, characterized .that the steam is fed to a dome arranged on top of the cooker will. 4. Pressure cooker for performing the method according to claim: 2 and 3, characterized by the arrangement that the outlet tube for sterilizing liquid, which is known in Way is pushed out of the cooker by supplying liquid under pressure, below the normal surface of the liquid in the cooker is connected so that the vapor cushion: maintained on the liquid surface during the cooling process will.