Stoves and furnaces – Hot-air furnaces – Feeding air
Patent
1995-12-12
1997-09-23
Yeung, James C.
Stoves and furnaces
Hot-air furnaces
Feeding air
126 77, 126290, 236 96, F24H 300
Patent
active
056693737
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to thermostatic air flow controllers.
BACKGROUND OF THE INVENTION
The invention relates to a thermostatic air flow controller which has a main passage for air from a source of air to a receiving vessel, for instance the interior of a heating stove, and in which main air passage register plates with matching openings are placed in such a way that it is possible to adjust the area of the passage through the register plates by moving one of the register plates respective to the other plate. The adjustable register plate is connected to a temperature sensing element, which is placed in a secondary air passage, in such a way that the temperature of the secondary air flow will influence the sensor element, which then through said connection adjusts the openings for the main air flow.
Air flow controllers of this type make it possible to regulate a flow of air according to the temperature of the incoming air. Such controllers may find a use in connection with ventilation systems and similar systems, but the most obvious application is in connection with heating stoves. Such stoves generally have an air inlet admitting air from the room to be heated into the stove to supply the fire in the stove.
An air flow controller of this type is known for instance from the specification of German patent nr. 683492, which shows an air flow controller with a main air passage in which is placed a set of register plates which regulate the flow through the controller by angular movement of one plate in relation to the other plate. The air flow controller is meant to be connected to a side wall of a heating stove in such a way that the air flow may nourish the fire in the stove. Furthermore this flow controller has a secondary air passage which also leads to the interior of the stove, and in which secondary passage is placed a temperature sensing element which is connected to the movable register plate.
The secondary air passage is arranged as a special housing placed on the side of the housing for the main air passage. This arrangement necessitates the use of a rather great number of parts which have to be assembled to form the controller.
It is an object of the invention to indicate a simpler and more compact arrangement of an air flow controller of this type, which controller consists of fewer parts than the previously known controllers and provides a simpler and more reliable connection between the thermostatic element and the movable register plate.
SUMMARY OF THE INVENTION
This has been achieved according to the invention by a construction in which the temperature sensing element is placed close to the register plates and between those plates and a heat shield in such a way that the temperature sensing element is shielded from the influence of the temperature in the receiving vessel, and that the two passages for air flow unite in the area surrounding the temperature sensing element in such a way that they will sweep the surfaces of the heat shield and cool the shield.
Compared to the construction according to the above mentioned German patent specification the air flow controller according to the invention may be assembled from considerably fewer parts and may be designed as a more compact unit. By placing the temperature sensing element close to the register plates a much more reliable connection between the element and the movable register plate may be achieved.
Furthermore the position of the temperature sensing element close to the junction of the two air flow passages ensures a reliable dependence of the element on the temperature of the incoming air without any interference from any other heat source.
A special embodiment of the air flow controller according to the invention is characterised in that a second set of register plates are placed across the secondary air passage in such a way that the air flow through said secondary air passage may be manually adjusted.
The secondary air passage admits air to the receiving vessel even when the main air flow is completely
REFERENCES:
patent: 2164417 (1939-07-01), McKee
patent: 2948276 (1960-08-01), Harding
patent: 3168088 (1965-02-01), Martin et al.
patent: 4180051 (1979-12-01), Maier et al.
patent: 4629114 (1986-12-01), Baker
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