Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D22/00—Control of humidity
  • G05D22/02—Control of humidity characterised by the use of electric means

Definitions

• the present invention relates generally to humidity control systems and, more particularly, to a system for electronically providing precise control of humidity in a substantially enclosed humidity-sensitive environment.
• a typical tobacco humidor is an enclosed storage box, frequently made of and lined with untreated Spanish cedar or another wood or moisture absorbent material; an absorbent wick or sponge for retaining and imparting moisture into the chamber; and a "dial-type" hygrometer for measuring the storage chamber's relative humidity content.
• a user opens the chamber, reads the hygrometer and finds the relative humidity measures lower than desired, more water can be added to the wick or sponge and allowed to evaporate, thus increasing the relative humidity within the chamber.
• This configuration suffers from the drawback that the chamber must be opened to the external environment to check the hygrometer measurements or withdraw a tobacco product, thus releasing humidity from the chamber and retarding the humidification process.
• humidors employing nonelectronic dial- type hygrometers typically have much larger margins of measuring error than electronically sensing hygrometers.
• Another problem associated with the above-described configuration is the varying effects of humidity on the retained moisture content of goods housed in a constant relative humidity but subject to different temperatures.
• Organic products are not ideal compounds, but complex systems of elements and structures which may deviate significantly from the above-described relative humidity dependent linear relationship. Accordingly, it is found that approaches which ignore the impact of temperature on relative humidification effects are inferior for maintaining precise control of environments housing humidity-sensitive products.
• humidors equipped with moistened wicks through which air is propelled with a fan or blower tend to release uncontrolled amounts of potentially contaminated liquid moisture, rather than controlled amounts of vapor, into the chamber and onto the goods stored therein.
• tobacco goods which become wettened by fluid, rather than bathed in moist vapor, can provide localized breeding grounds for molds, fungi, tobacco beetles and the like which are indigenous to tobacco products. This is also true for systems relying exclusively on heating elements to facilitate water vapor delivery.
• the above-described configurations also fail to address problems associated with rehumidifying products which have previously dried out as a result of storage in an environment suffering from inadequate humidity control. For example, rapid rehumidification of a cigar by immersion in an atmosphere which would otherwise be ideal if the cigar had not been allowed to dry out may instead cause the wrapper to swell, peel or crack as its moisture content increases disproportionately to the moisture content diffused back into the body of the cigar.
• an electronic humidity control system wherein precision control of the effects of humidity on goods stored in a substantially enclosed chamber is realized, and problems with poor humidity such as poor manufacture and storage characteristics, unnecessary spoilage and infestation by beetles and molds and the like are avoided.
• Figure 1 is a side view of a humidity control system within the scope of the present invention.
• Figure 2 is a side view of a second humidity control system within the scope of the present invention.
• a module suitable for retrofitting an existing humidity chamber lacking the advantages of the present invention comprising a product storage section 1, a control device 2a, and a sensing device 2b.
• sensing device 2b When air within product storage section 1, in which the module embodying the present invention has been placed, is exposed to sensing device 2b, sensing device 2b will determine relative humidity and/or temperature values for the measured air.
• control device 2a activates air intake device 3a, which draws air from product storage section 1 into humidity delivery section 4 via plenum 3b and air outflow device 3c. Once the air drawn from product storage section 1 has entered humidity delivery section 4, the air is then either forced or drawn over a moisture absorbent material 5, or alternatively, over a container of stored fluid.
• Moisture absorbent material 5 may be either partially or fully saturated with an absorbed fluid such as water or the like, and may be treated with copper sulphate or another nonvolatile substance to help retard the spread of organic growths and infestations.
• a level detector 7 for detecting the level of the fluid absorbed in moisture absorbent material 5 is employed, and in still further embodiments a heating element 8 is provided for heating either the fluid absorbed in moisture absorbent material 5 or the humidity conditioned air produced thereby before the air is recirculated back into product storage section 1 via air outflow device 9.
• air intake device 3a and air outflow devices 3 c and 9 may comprise a fan, valve, door or flap or the like for assisting the circulation of air drawn from product storage section 1 through humidity delivery section 4 and back into product storage section 1.
• Air outflow devices 3c and 9 may also form a substantial seal when in a closed position to prevent the fluid absorbed in absorbent material 5 from spilling or leaking into product storage section 1 should the entire system be rotated or tilted, and to prevent uncontrolled diffusion of vapor into product storage section 1.
• a permeable membrane 6 may be disposed over moisture absorbent material 5 for further limiting the migration of liquid from moisture absorbent material 5 into other parts of the system.
• FIG. 2 another exemplary embodiment of the present invention is depicted comprising a product storage section 1, air circulation section 12, and humidity delivery section 4.
• Air circulation section 12 further comprises an air intake device 10, an air outflow device 11, and at least one of a humidity sensor 2b, temperature sensor 2c or a timing device (not shown).
• air intake device 10 may comprise a fan, valve, door or holes or the like for drawing air from product storage section 1 into air circulation section 12 for analysis by humidity and temperature sensors 2b and 2c, respectively.
• Humidity and temperature sensors 2b and 2c which may be located either on or in communication with control device 2a, determine relative humidity and temperature values for the air drawn from product storage section 1.
• air outflow device 11 comprises a fan, valve, door or holes or the like for substantially sealing off each of the system sections from one another when air outflow device 11 is closed.
• air intake device 10 and/or air outflow device 11 comprise a flap, valve or door or the like which opens in response to pressure induced by air flow through the system, or in response to an electronic signal from control device 2a, and which forms a substantial seal when in a closed position.
• air circulation section 12 and air intake/outake devices 10 and 11, respectively may be eliminated from the system.
• a humidity delivery section 4 comprising an air intake device 3 a, a moisture absorbent material 5, and an air outflow device 9.
• humidity delivery section 4 further comprises a heating element
• air intake device 3 a and/or air outflow device 9 comprise a door, flap or valve or the like which opens in response to pressure induced by air flow through the system, or in response to control device 2a, for substantially sealing off humidity delivery section 4 when air outflow device 9 is closed.
• humidity sensor 2b and temperature sensor 2c humidity and temperature values for the drawn air are determined.
• control device 2a When humidity sensor 2b and temperature sensor 2c communicate to control device 2a an insufficient relative humidity percentage present in the air to maintain desired humidification characteristics within product storage section 1 given a particular temperature, air intake device 3 a is activated by control device 2a, thereby drawing air from product storage section 1 into humidity delivery section 4 for humidity and/or temperature conditioning.
• control device 2a may comprise, either structurally integral therewith or as discrete components, one or more of a temperature sensor, a humidity sensor, a timing device, an air circulation section activator, a humidity delivery section activator, or controllers for opening and closing air intake devices 3 a and 10 or air outflow devices 9 and 11.
• Humidity sensor 2b may alternatively comprise one or more of a humidity sensitive capacitor or resistor.
• control device 2a may also include an integrated circuit with an algorithm or a look-up chart or the like embedded therein for determining a relative humidity percentage which will provide the desired humidification effects as a function of temperature and/or time. Control device 2a may further control the temperature within humidity chamber 1 by controlling one or more of a heating device 8 or cooling device 13.
• Control device 2a may also comprise a controller for controlling a drier, refrigeration means, or a pump (not shown), for removing moisture from the environment when the relative humidity percentage is too high.
• product storage section 1 may also comprise an outside air intake device 14 or external sensing device 16 responsive to control device 2a for admitting air from outside the humidity controlled system when necessary or desirable to achieve particular humidification effects.
• control device 2a may be a number of discrete devices for accomplishing any or all of the functions described above, and may also be located, either together, separately or in combination, in product storage section 1, air circulation section 12, humidity delivery section 4 or even outside the system entirely.
• a heating element 8 or a cooling element 13 may also be disposed in either the product storage section 1, air circulation section 12 or humidity delivery section 4, or eliminated entirely from the configuration.
• humidity delivery section 4 further comprises a moisture absorbent material 5 and a fluid absorbed therein for adding humidity to the air drawn by air intake device 3 a, the humidity being increased as a result of processes induced by air moving over the moisture absorbent material 5.
• a moisture absorbent material 5 and a fluid absorbed therein for adding humidity to the air drawn by air intake device 3 a, the humidity being increased as a result of processes induced by air moving over the moisture absorbent material 5.
• copper sulphate or another nonvolatile substance is added to the fluid absorbed within moisture absorbent material 5 for retarding the growth of molds or other undesirable organisms, and, alternatively, the fluid or the moisture absorbent material 5 is also impregnated with a perfume having the odor of certain woods or the like.
• the moisture absorbent material 5 comprises a very porous and fluid-retaining material such as florist foam or the like, which permits vapor to be added to the air being circulated through humidity delivery section 4 while minimizing the migration of liquid moisture.
• moisture absorbent material 5 is substantially covered by a permeable membrane 6 to better facilitate containment of the fluid absorbed in moisture absorbent material 5.
• moisture absorbent material 5 is replaced by a container of stored fluid which may also be covered by a permeable membrane if desired.
• Air outflow device 9 may also comprise one of a flap, valve or door or the like, responsive to either pressure induced by air flow, or as a result of an electron- ic signal from control device 2a.
• air outflow device 9 and air intake device 3 a include doors, flaps or valves or the like which substantially provide a seal when closed, so that the fluid stored in moisture absorbent material 5 will not pour out when the system is rotated or tilted, and to isolate generated humidity from the humidity delivery section 4 when desirable.
• one or more of a heating element 8 or cooling element 13 may be located, either together or separately, in one or more of the product storage section 1, air circulation section 12 or humidity delivery section 4, and be controlled by control device 2a.
• control device 2a will comprise at least one of a plurality of control components such as a humidity sensor, a temperature sensor, an air circulation section activator, a humidity delivery section activator, a timing device, an air intake device 3a or 10 activator, an integrated circuit with an algorithm or a look-up chart or the like embedded therein for determining the proper amount of relative humidity necessary to provide the desired humidification effects as a function of temperature or time, a controller or set of controllers for opening or closing air outflow devices 9 or 11, an activator for turning on or off heating element 8 or cooling element 13, or a controller or set of controllers for controlling one or more of a plurality of remote circulation fans 15.
• a humidity sensor such as a humidity sensor, a temperature sensor, an air circulation section activator, a humidity delivery section activator, a timing device, an air intake device 3a or 10 activator, an integrated circuit with an algorithm or a look-up chart or the like embedded therein for determining the proper amount of relative humidity necessary to provide the desired humidification effects as a function of temperature
• the humidity sensor may comprise one or more of a humidity sensitive capacitor or resistor as are well known to those of skill in the appropriate arts, or alternatively, comprise one or more of a combination of the above-described components in the form of a system of individually discrete components located either in product storage section 1, air circulation section 12, humidity delivery section 4, or in a combination thereof.
• An additional sensing device 16 may also be disposed outside the controlled environment for still more precise humidity control.
• either the interior or exterior of the substantially enclosed humidity chamber may comprise a moisture absorbent wood, such as Spanish cedar or the like, but may also comprise other materials, such as plastic for example, which are impregnated with an appropriate wood odor.
• the innermost portion of the chamber may be lined with wood or another material and further impregnated with an appropriate wood odor.
• the presently provided electronically controlled humidity system is applicable to any industrial application wherein goods are stored or manufactured in environments in which it would be beneficial to control the effects of surrounding humidity with greater precision, such as the manufacture or storage of tobacco products, baked goods, floral products, pharmaceuticals, electronic components and the like.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Automation & Control Theory (AREA)
• Drying Of Gases (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=22260414

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (2)

Family Cites Families (5)

• 1997
  • 1997-02-21 EP EP97955082A patent/EP0993333A4/de not_active Withdrawn
  • 1997-02-21 WO PCT/US1997/002813 patent/WO1998039086A1/en not_active Application Discontinuation

Patent Citations (2)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events