 Recirculating air calender roll controller |
| The present invention controls local calender roll diameters by directing temperature controlled ... |
|
| Freight securing apparatus |
| The present invention provides a method and apparatus for securing loads, which is particularly ... |
|
| Isolation method and apparatus for sterilizing chambers of filling machines |
| What is claimed is: 1. In a sterilizing method which includes the establishment of a toxic ... |
|
| Multipurpose cooker |
| The present invention provides a multipurpose cooker which eliminates the aforesaid problems. A... |
|
| Water heating vessel |
| I claim: 1. A water heating vessel comprising a body portion (10), an electric heating element (16) ... |
|
| Steam exhaust system of an electric pressurizing rice cooker |
| Accordingly, the present invention has been made in an effort to solve the problems occurring in ... |
|
| Drive for a coffee-making device |
| It is the object of the present invention to simplify a coffee-making device of the type described ... |
|
| Valve assembly with water dispersing and spreading system |
| This invention relates to a valve assembly with an internal fluid distribution system and more ... |
|
| Tea maker |
| What we claim is: 1. Apparatus for preparing beverages comprising a housing, a water container in ... |
|
|
Hydraulic driving device for an electric pressurized-gas switch
| Details |
Inventors: Eggert, Horst; Jacobsen, Wolfgang;
Assignee: Siemens Aktiengesellschaft (Munich, DE)
Primary Examiner: Macon; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
In a hydraulic driving device for an electric pressurized-gas switch, the piston-cylinder systems are responsive to pressure from a hydropneumatic pressure accumulator. The driving device is equipped with a hydraulic pump which feeds several pressure accumulators and is controlled by pressure monitors, and with a gas monitoring device for the pressure monitors. For solving the problem of carrying out indirect gas monitoring while feeding several pressure accumulators by one hydraulic pump instead of direct gas monitoring, there is provided at least one threshold switch for measuring the feed pressure of the hydraulic pump as part of the gas monitoring device. By feeding the pressure accumulators which takes place sequentially in time and is controlled on the one hand by the gas monitoring device and by the pressure monitors on the other hand, it is possible to establish a correlation specific as to the pressure accumulator of the gas loss signal delivered by the threshold switch. |
|
DETAILED DESCRIPTION It is an object of the present invention to provide, for a hydraulic driving device of the type mentioned above, indirect gas monitoring instead of direct gas monitoring if several pressure accumulators are fed by one hydraulic pump.
The above and other objects of the present invention are achieved by an hydraulic driving device for an electric pressurized-gas switch having a piston-cylinder system comprising a plurality of piston-cylinders for operating respective switch contacts, each of said piston-cylinders being responsive to an hydropneumatic pressure accumulator, an hydraulic pump being provided for supplying several of said pressure accumulators, each of said pressure accumulators being controlled by a pressure monitor which monitors the pressure in a feed line to the respective accumulator, and further comprising a gas monitoring device for the pressure accumulators, the gas monitoring device having at least one threshold switch for measuring an output pressure of the hydraulic pump and further comprising means for controlling the hydraulic pump to supply hydraulic fluid to the pressure accumulators sequentially in time responsive to the gas monitoring device and the pressure monitors.
By the application of the invention, the functional advantages of direct gas monitoring are combined with those of indirect gas monitoring.
The need for hydraulic pumps is comparatively small.
The fixed correlation in time of each pressure accumulator to the hydraulic pump feeding it assures for each occurring gas loss signal at the same time the functional, and thereby, structural association of the fault source and the type of fault.
Thus, designs can be created, for instance, which are mechanically simple and rugged because a large amount of mechanical auxiliary devices is not necessary.
In particular, the cost of gas seals is kept low.
A comparatively high freedom from disturbances and service friendliness are the result.
In one advantageous embodiment of the invention, the threshold switch can be arranged in a main feedline common to all pressure accumulators, so that only one threshold switch needs to be provided for gas monitoring all pressure accumulators provided
|
| Related patents |
|
|
Method and apparatus for demounting a spot welded metal plate
An object of the present invention is to provide a method and an apparatus, which is free from the above-described disadvantages, does not require much labor or skill of ...
|
|
|
Welding device for a cylindrical tube
I claim: 1. A device for making a peripheral welding seam on a cylindrical tube having a tube axis comprising: a frame adapted to surround at least a circumferential ...
|
|
|
Air heater for a calender roll diameter controller
As previously discussed, the air heaters of my previously filed applications can use electrical heating elements, such as coiled electrically resistive wire, to heat the ...
|
|
|
Scrap metal press for producing compacted scrap blocks
It is an object of this invention to provide a press as specified above, which while retaining all the advantages of prior presses can obviate their shortcomings. In ...
|
|
|
Method for improving the printability characteristics of gloss calendered paper
What is claimed is: 1. A process for treating paper coated on one side, which comprises: applying a liquid only to the uncoated side in an amount sufficient to provide a ...
|
|
|
Method of preventing tarnishing of polished glass articles
What is claimed is: 1. A method of preventing tarnishing of a polished glass article by corrosion of the polished glass surface due to moisture, which method comprises ...
|
|
|
Guide device for boat trailers
What is claimed is: 1. A boat guide mechanism for mobile boat trailers having front and rear ends, ground engaging wheels, and longitudinally extending members, ...
|
|
|
Parts washer
One embodiment of the invention might include a parts washing apparatus having a sink with a drain. There is provided a filter apparatus for washing fluid having an ...
|
|
|
Filter press
The present invention is directed toward the provision of a filter press having such a construction as to enable through a certain arrangement of a means for clamping ...
|
|
|
Filter apparatus
It is therefore an object of the present invention to provide a water or other fluid filter in an openable housing which overcomes the disadvantages of the prior art. T...
|
|
|
Cooking 
