Pressure relief system

Details Pressure relief system Pressure relief system

Filed on

1994-09-19

Date issued

2001-10-30

Examiner

Waks, Joseph (Department: 2834)

Patent Class

Electricity: conductors and insulators

SubClass

With fluids or vacuum

SubSubClass

Boxes and housings

Other Related Categories

C137S596160, C251S030030

Type

Reexamination Certificate

Status

active

Patent number

06310283

Description

ABSTRACT:

FIELD OF THE INVENTION
The instant invention relates to a pressure relief system for a control system having a housing and housing chamber to receive electrical equipment.
BACKGROUND OF THE INVENTION
The electrical components used in a control system are, depending on their type, partially or wholly non-resistant to pressure. The housing chamber containing the electrical equipment must, therefore, be able to breathe. In other words, no pressure higher or lower than atmospheric pressure may build up in the housing chamber, i.e., the housing chamber should be able to breathe. In this context it is immaterial whether the pressure originates in a terrestrial atmosphere or in an artificial atmosphere, e.g., a protective gas.
It is known to effect the breathing of the housing chamber via its own breathing device. This breathing device permits flow out of the housing chamber into the atmosphere, as well as in the opposite direction. An additional goal of the breathing device is to inhibit the penetration of pollutants and humidity into the housing chamber from the atmosphere. This goal is not attained to a satisfactory extent in all cases. Consequently, disturbances in operation may occur.
SUMMARY OF THE INVENTION
It is, therefore, an object of the instant invention to improve by simple means the operating safety of a pressure relief system for a control device.
In one embodiment of the invention a pressure relief system for, a control system with a housing is provided. A housing chamber is located in a housing. Electrical equipment is located in the housing chamber. A valve system having a pressure relief device is also provided, wherein the housing chamber is connected via a connecting device to the pressure relief device.
In another embodiment of the invention, the valve system is electrically controlled and the control system controls the valve system.
In another embodiment of the invention, the control system and the valve system have a common housing and the connecting device is a housing channel.
In still another embodiment of the invention, a gas drying system is installed in the connecting device.
In yet another embodiment of the invention, the gas drying system operates on a chemical principle.


REFERENCES:
patent: 4345620 (1982-08-01), Ruchser et al.
patent: 4617961 (1986-10-01), Lichtenberg
patent: 4821908 (1989-04-01), Yost
patent: 5039069 (1991-08-01), Friederichs et al.
patent: 24 25 990 (1975-01-01), None
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patent: 41 18 834 (1992-12-01), None
patent: 0 160 750 (1985-11-01), None
patent: 2 654 694 (1991-05-01), None

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