Automatic temperature and humidity regulation – Ventilator type – Electrically actuated
Patent
1998-12-08
2000-10-10
Tanner, Harry B.
Automatic temperature and humidity regulation
Ventilator type
Electrically actuated
236 51, 454258, F24F 1100
Patent
active
061292869
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a ventilation system, in particular for use in the agricultural field, comprising at least one ventilator which is coupled to an electromotor comprising at least one excitation winding, which is connected to a voltage source via a control unit, whereby said control unit includes a processor module comprising a digital computing circuit and at least one memory for storing control software and control quantities, which processor module includes communication means for exchanging data between the processor module and a remote central processing unit via a communication link.
A ventilation system of the above kind is disclosed in published European Patent Application No. 0 545 499. In this known system a ventilator is controlled by means of a remote central processing unit, which transmits control signals via a communication link to a processor module incorporated in the ventilator, which controls the ventilator on the basis of the signals being received. The processor module furthermore transmits status signals, such as the rotational speed and temperature of the ventilator, to the central processing unit, which in turn utilizes these signals for controlling the ventilator. A drawback of this known system for the remote control of one or more ventilators is the fact that in case of failure of the central processing unit and/or of the communication link between said unit and the processor module, all ventilators in the system will stop, with all its consequences. The aforesaid European document furthermore makes mention of the fact that in case of failure of the central processing unit and/or of the communication link, the processor module will control the ventilator to a preset ventilation level. Although the ventilator will not stop in that case but will continue to operate at a predetermined ventilation level, it will be apparent that under certain circumstances said ventilation level may differ rather much from the ventilation level which is desired in order to maintain the conditions in the space ventilated by the ventilator at an acceptable level. Ventilators of the kind to which the invention relates are frequently used in the agricultural field for ventilating cattle and poultry houses, for example, whereby the conditions in these spaces must be critically maintained at a precisely determined level. If the ventilator falls back to a predetermined fixed ventilation level in case of failure of the central processing unit and/or of the communication link, as is the case with the known system, the conditions in the space to be ventilated may become unacceptable after a very short time already.
SUMMARY OF THE INVENTION
An object of the invention is to provide a ventilation system suitable for use in industrial and agricultural applications, processes, etc., which overcomes the aforesaid drawback and which will control the ventilator in such a manner that the conditions in the space to be ventilated will remain acceptable, also in case of failure of the central unit and/or of the communication link.
In order to accomplish that objective the ventilation system according to the invention is characterized in that communication means the processor module of the ventilator also includes connections for connecting sensors associated with said ventilator for measuring process quantities, such as the rotational speed, the temperature, the displaced air volume, etc., and in that said processor module is arranged in such a manner that in case of failure of the central processing unit and/or of the communication link the processor module will control the ventilator on the basis of the process quantities measured by the sensors associated with said ventilator. In the system according to the invention each ventilator has its own sensors for measuring process quantities, which quantities are supplied to the processor module, whereby said module is arranged in such a manner that in case of failure of the central processing unit and/or of the communication link the pr
REFERENCES:
patent: 4333316 (1982-06-01), Stamp, Jr. et al.
patent: 5326027 (1994-07-01), Sulfstede
patent: 5407129 (1995-04-01), Carey et al.
A. Vostermans B.V.
Tanner Harry B.
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