Automatic temperature and humidity regulation – Humidity control
Patent
1986-02-26
1987-06-23
Tapolcai, William E.
Automatic temperature and humidity regulation
Humidity control
251 89, G05D 2200
Patent
active
046746803
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve device for the automatic control of an air intake dependent on varying humidity with a view to maintain a desired degree of humidity in a room, comprising a throttle valve mounted in an air intake conduit and operatively connected with a humidity sensitive member exposed to room air and consisting of a sheetlike laminate which at varying humidity content tends to change curvature.
Such a valve device is known from EP-A2-0068917, in particular FIG. 5 thereof, in which the air intake conduit is controlled by a resilient valve plate atempting to keep the conduit closed and which by means of a pull cord is connected with a humidity sensitive laminate plate mounted in a coextensive conduit through which the humidified air is allowed to flow. By increasing curvature due to increasing content of humidity in the room air the laminate plate overcomes the spring force of the valve plate, thereby compelling this plate to move in the opening direction.
The present invention particularly pays regard to the fact that it may be desirable under certain circumstances to interrupt the automatic control of the valve. For example, there may be some need for intake of fresh air even at a comparatively low degree of humidity in the room air, i.e. when the humidity sensitive member attempts to keep the valve closed, or it may be desirable to keep the valve in its closing position against outer wind pressures, even though the degree of humidity in the room should cause an opening.
The purpose of the invention is fulfilled in that the humidity sensitive member is associated with a manual adjusting device which in its extreme positions is adapted to cause a compulsory closing and compulsory opening, respectively, of the valve by overcoming the tendency of the humidity sensitive member to change its curvature and, in an intermediate position has no effect thereon.
Under normal conditions the manual adjusting device is in its intermediate position so that the device in principle operates in the same manner as the above mentioned prior device, i.e. providing for an enhanced and reduced fresh air intake at increasing and decreasing degree of humidity in the room air, but an interruption of said automatic operation only requires a simple shifting of the adjusting device in the one or the other direction, in dependence on whether it is desired to keep the valve open or closed.
The humidity sensitive member may in a known manner be a metal sheet laminated with wood veneer and, as is also the case with the above mentioned prior design, at least at one end edge that is parallel to the fibre direction of the wood it may be so mounted in a housing through which the humidified room air flows that it may freely, i.e. unimpeded by the mounting means, assume a curvature corresponding to the actual degree of humidity, and at a point spaced from the mounting it may be operatively connected with the throttle valve. In this case it is preferred, according to the invention, that the operative connection includes a rigid rod which at the humidity sensitive member is associated with a pin projecting from an edge of said member and engaging a guideway provided in the manual adjusting device and allowing, in the center position of said device, an unimpeded movement of the pin between its positions corresponding to fully open and fully closed throttle valve and causing, by movement of the device away from the center position, a compulsory lateral displacement of the pin and thus also a compulsory opening and closing, respectively, of the valve.
This entails a relatively simple and safely operating structure that may be of a very compact design so that the overall dimensions of the valve device may be kept appropriately small, particularly in case the manual adjusting device is a slide located in the housing and controlled to be displaced in a direction parallel to the edge adjacent the humidity sensitive member, and the guideways of which form an angle of about 45.degree. with said direction.
Two embodiments of the valve d
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patent: 3780940 (1973-12-01), Genbauffe
patent: 4231389 (1980-11-01), Still et al.
patent: 4460122 (1984-07-01), Jardinier et al.
patent: 4515308 (1985-05-01), Jardinier et al.
Nielsen Elgard
Nielsen Per G.
Tapolcai William E.
V. Kann Rasmussen Industri A/S
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