DE617584C - Pressure cooker for sterilizing filled cans and the like like - Google Patents

Description

GERMAN EMPIRE

ISSUED ON AUGUST 22, 1935

REICH PATENT OFFICE

PATENT LETTERING

CLASS 53c GROUP

2) ipi.-3ng * Kaare Omsted in Oslo

The invention relates to pressure cookers for sterilization with subsequent cooling of placed in closed vessels (cans, glass or earthen containers, etc.) Food in a liquid that both during sterilization and is maintained under a pressure equal to or higher than during the cooling process is the pressure that is in the vessel as a result of the expansion of the contents and the air as well caused by the development of steam during the heating treatment to prevent bulging, Avoid leaking or bursting of the vessels as a result of the internal pressure.

According to the invention, the stove is supported by an adjustable, weight or spring-loaded, the pressure in the cooker regulating overflow valve with an appropriate over the cooker arranged container in

ao bond in which when the cooker is heated by means of pressurized steam introduced into it during the sterilization by thermal expansion and condensation of the Heating steam pitting excess water and also the hot one after sterilization Sterilization water displaced by the supply of cooling water under pressure through the Overflow valve can pass over to be stored and reused can.

'The arrangement brings besides the advantage of maintaining the desired Pressure in the cooker also has the advantage of considerable heat savings through the Possibility of re-using the stored hot water, as it is practical only radiation losses come into consideration, which are, however, caused by the insulation of the Storage container can be kept very low. On top of that, on this Way introduced into the boiler water from a temperature close to the sterilization temperature can be, in particular since also in the storage tank 'din essentially same overpressure as in the cooking container and accordingly a higher temperature than 100 ° C can be kept. In certain circumstances can even · heating steam can be fed into the storage tank to maintain the temperature to hold at a desired height. The arrangement of the storage container over the cooker has the advantage that the return of hot water to the cooker is simple and that oil and fat that comes into the cooker with canned food rises into the storage tank and accumulates at its highest point, from where it can be easily removed!

To compensate for during operation occurring pressure fluctuations in the cooker

is according to the invention a pressure equalizer associated with the same provided ^ in the; Pressurized water from the cooker can flow in and be stored under pressure and "from which the pressurized water if there is a pressure drop in the cooker, it can flow back freely into it and so the Can essentially restore pressure. Preferably, the pressure equalization is as ίο a closed container in which the pressure is created and maintained by the fact that air flows in is compressed by pressurized water from the cooker. The container is expedient connected to the cooker by a pipe, in which 'a water seal is provided is to prevent steam from the cooker from entering the container.

The water in the pressure • equalizer can also be, among other things, as air pressure, for example under hydraulic pressure by placing the pressure equalization tank at a height above the cooker that corresponds to the working pressure in-this corresponds to in which-case a water seal is also provided in the pipe between the cooker and the container can be.

In the drawing is an embodiment of a cooker according to the invention shown schematically.

In the drawing, 1 denotes the cooker and 2 an expansion tank containing air, which is connected to the cooker ι by a water seal, 3. Of the Container 2 is useful with a calibrated Provide a sight glass through which the water level can be observed.

The cooker stands due to a weight-bearing overflow that regulates the pressure in it. or control valve 4 and a pipe 14 with a suitably insulated hot water tank 16, who runs down over the stove on supports 15, in connection. A check valve ϊ 7 is in the. Robr 14 provided. A second Robr 18, 'the one with a. Shift shut-off valve 19 is given from the valve 4 to a drain pipe 20.

The heating of the sterilization water in

the boiler and the maintenance of the pressure in it is effected with the aid of steam which is supplied through a pipe 6. The temperature in the cooker is regulated with the aid of a valve 7 which is controlled by a temperature meter 8. The steam supply pipe 6 is also provided with a bypass line 9 next to the.

Control valve 7 and shut-off valves 10, so that the steam, if necessary, Can be diverted around the control valve. A shut-off valve 11 for the steam is located in front of the stove (.

When the sterilization is complete, the steam supply is turned off and the cooling water is removed Kocber is fed through a pipe 12 ′ which is provided with a shut-off valve 13. If the Pressure in the cooker when closing the steam supply line and opening the pipe for the cooling water falls, this pressure drop is compensated by the fact that the compressed Air in the container 2 pushes a certain amount of water back into the cooker.

The cooling water presses the warm sterilization water through the valve 4 and the pipe 14 into the hot water tank 16. Here the drain valve 19 is closed. The hot water tank 16 is provided with a safety valve 21, to which a Robr 22 ″ is connected, which leads to the drain pipe 20 leads so that steam and water can escape when the pressure in the hot water tank an undesired height has been reached or the container is already completely full.

If the cooling of the sterilized vessels is completed, then the cooling liquid is through a valve 23 is drained into the drain pipe 20, whereupon the cover of the cooker 1 is opened to take out the sterilized contents and bring in new material. The lid can then be closed for the next sterilization process hot liquid from the hot water tank 16 into the bowl through a valve 24 and a pipe 25 run back.

Claims (2)

Patent claims: 1. Pressure cooker for sterilizing filled cans and the like with Liquid filling, characterized in that the bowl (1) can be regulated by a loaded overflow valve (4) with hot water during and after Sterilization receiving, expediently pressure-resistant container (16) in connection stands. 2. Pressure cooker according to claim 1, characterized characterized in that the cooker (1) is connected to a pressure equalizer (2) stands in the air by the influx of pressurized water from the stove is compressed and from which the pressurized water is released into the. Flow back cooker can. 1 sheet of drawings