Patent Application
20220205645
The present disclosure relates to aircraft ovens, and more particularly to air outlet filters in aircraft ovens.
Modern ovens, e.g. such as those used in aircraft galleys, have a condenser on the outlet of the oven to capture moisture from the exhaust air. The principle of a condenser is too cool down the exhaust air, so that the humidity in the air condenses to water, which can then be captured or recycled. The condensers used in modern ovens have poor efficiency to capture moisture, which if left unchecked can result in excessive moisture in the galley monument and effectively resulting in fungus growth.
The conventional techniques have been considered satisfactory for their intended purpose. However, there is an ever present need for improved systems and methods for more effective moisture capture in an oven air outlet. This disclosure provides a solution for this need.
An oven comprises a cooking volume and a fluid inlet in fluid communication with the cooking volume for ingress of fluid into the cooking volume. The oven also comprises an outlet conduit in fluid communication with the cooking volume for egress of fluid from the cooking volume. The oven further includes a hydrophobic filter in the outlet conduit configured to capture moisture from a flow of fluid egressing from the cooking volume.
The hydrophobic filter can include a fabric filter element of a hydrophobic material within a filter housing defining a filtration flow path therethrough. There can be no condenser in the outlet conduit. The hydrophobic filter can be configured to allow passage of fluid therethrough to an outlet of the outlet conduit, and to separate liquid water from the gas to a liquid water drain in fluid commination with the hydrophobic filter. The hydrophobic filter can also include a filter housing defined along a longitudinal axis oriented vertically. The filter housing can include PTFE.
A drain can connect to a bottom portion of the filter housing for gravity driven flow of liquid water out of the filter housing. The drain can include a drain conduit that outlets to a heated surface of the oven for evaporation of liquid water from the drain to ambient surroundings of the oven. A fluid source can operatively connected to supply fluid to the fluid inlet for steam cooking.
A drain conduit for an oven can comprise a conduit body with inlet and an outlet with a hydrophobic filter between the conduit inlet and configured to capture moisture from a flow of gas through the conduit body. The drain conduit can further include a recycle conduit in fluid in fluid communication with a cooking volume for recycled injection into the cooking volume.
These and other features of the systems and methods of the subject disclosure will become more readily apparent to those skilled in the art from the following detailed description taken in conjunction with the drawings.
So that those skilled in the art to which the subject disclosure appertains will readily understand how to make and use the devices and methods of the subject disclosure without undue experimentation, embodiments thereof will be described in detail herein below with reference to certain figures, wherein:
Reference will now be made to the drawings wherein like reference numerals identify similar structural features or aspects of the subject disclosure. For purposes of explanation and illustration, and not limitation, a partial view of an embodiment of an oven in accordance with the disclosure is shown in
Shown in
The oven 100 can include a hydrophobic filter 114 disposed in the outlet conduit 112 to capture moisture from the flow of fluid egressing from the cooking volume 102 as it flows through the outlet conduit 112. The hydrophobic filter 114 can include a fabric filter element 116 of a hydrophobic material, for example, the fabric filter element can be any suitable material that includes microstructures for hydrophobicity. The hydrophobic fabric filter element 116 will allow passage of gas (e.g. air or exhaust from the cooking volume 102) to an outlet 118 of the outlet conduit 112. When the fluid is passed through the fabric filter element 116, the liquid water can be separated from the gas, so the liquid water can then pass to a liquid water drain 120 in fluid communication with the hydrophobic filter 114. The hydrophobic filter 114 can be disposed within a filter housing 122 that defines a filtration flow path therethrough, for example as represented by arrow 124. The filter housing 122 defined along a longitudinal axis A oriented vertically relative to the direction of gravity so that captured moisture can flow downward through the filter 114. In embodiments, the filter housing 122 can include polytetrafluoroethylene (PTFE), any other suitable hydrophobic, heat resistant polymer, and/or any combination thereof.
Because the fabric filter element 116 can improve the efficiency of liquid water separation, the system therefore can no longer require a condenser in the outlet conduit. For example, the oven 100 can include no condenser anywhere in the line between the cooking volume 102 and a gas outlet 118 where gas is released from the outlet conduit 112 into ambient surroundings 126 of the oven.
The liquid water drain 120 can connect to a bottom portion 130 of the filter housing 122 for collection and gravity driven flow of liquid water out of the filter housing 122. In some embodiments, the drain 120 can also include a drain conduit 132 that outlets to a heated surface of the oven 100 for evaporation of liquid water from the drain 120 to ambient surroundings 126 of the oven 100, for example, the ambient surroundings 126 can include within a galley monument 136, and/or surrounding atmosphere outside the galley monument 136. The heated surface 134 may be the heating element 104 within the cooking volume 102 so the condensate may be reused used for cooking, or the heated surface 134 may be any number of and/or a combination of heated components within the system 100. In embodiments, the drain 120 could also recycle the collected water from the drain 120 to the steam supply 110, e.g. through recycle conduit 138, to be used for further injection into the cooking volume 102.
The methods and systems of the present disclosure, as described above and shown in the drawings, provide for improved capture of remaining moisture from an oven, reducing the amount of ambient moisture that can build in galley monument, preventing mold and fungal growth within the galley monument. Additionally, the galley walls can only withstand temperatures to a certain limit. If exhaust temperatures increase, there will be an increase the galley wall temperatures. The systems as described herein therefore provide for a reduction in galley wall temperatures, which can provide additional benefits to the oven system as a whole, e.g. faster and improved cooking performance. While the apparatus and methods of the subject disclosure have been shown and described, those skilled in the art will readily appreciate that changes and/or modifications may be made thereto without departing from the scope of the subject disclosure.
