Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C7/00—Stoves or ranges heated by electric energy
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C15/00—Details
  • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
  • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
  • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C15/00—Details
  • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens

Definitions

• the present invention generally relates to food serving equipment, and more particularly to an oven for heating food .
• this invention is directed to an oven which uses hot gas to maintain pre-cooked food at proper temperatures before serving.
• This type of equipment is often referred to using such terms as a holding oven, or a holding unit, or a food warmer.
• Such equipment is used in the fast food service industry to heat food prior to serving it.
• this invention is directed to an oven for heating food, comprising a housing having a left side, a right side, a top, a bottom, a back, and a front.
• the housing defines an oven cavity comprising at least one heating
• the heating compartment for heating food placed in the compartment.
• the heating compartment has a left side wall, a right side wall, a back wall, a top wall, a bottom wall, and an open front, without a door, in open communication with a surrounding environment outside the oven. Gas flow openings are provided in the left and right side walls.
• the oven includes a blower for blowing gas through the gas flow openings into the heating compartment, and a heater for heating gas blowing into the heating
• the gas flow openings are configured such that substantially all of the gas blowing into the heating compartment is directed generally away from the open front of the compartment.
• this invention is directed to an oven for heating food, comprising a housing having a left side, a right side, a top, a bottom, a back, and a front.
• the housing defines an oven cavity comprising at least one heating compartment for heating food placed in the compartment.
• the heating compartment has a left side wall, a right side wall, a back wall, a top wall, a bottom wall, and an open front, without a door, in open communication with a surrounding environment outside the oven.
• Gas flow openings are provided in the left and right side walls.
• the oven includes a blower for blowing gas through the gas flow openings into the heating compartment, and a heater for heating gas blowing into the heating
• a movable air deflector at the top of the open front of the heating compartment is provided for deflecting heated air into the heating compartment.
• the air deflector is movable between a lowered operative position and a raised position. In its lowered position, the air deflector extends down over only an upper portion of the open front of the heating compartment.
• this invention is directed to an oven for heating food, comprising a housing having a left side, a right side, a top, a bottom, a back, and a front.
• the housing defines an oven cavity comprising at least one heating compartment for heating food placed in the compartment.
• the heating compartment has a left side wall, a right side wall, a back wall, a top wall, a bottom wall, and an open front, without a door, in open communication with a surrounding environment outside the oven.
• Gas flow openings are provided in the left and right side walls.
• the oven includes a blower for blowing gas through the gas flow openings into the heating compartment, and a heater for heating gas blowing into the heating
• the heating compartment through the openings.
• the heating compartment has a side-to-side width of no more than about 14 inches.
• a gas dead zone at the front of the heating compartment extends
• the gas dead zone is substantially free of moving gas generated by the oven during operation of the oven to heat food in the heating compartment.
• FIG. 1 is a perspective of a first embodiment of an oven of this invention
• Fig. 2 is a front elevation of the oven
• Fig. 3 is horizontal section taken in the plane of
• Fig. 4 is a vertical section taken in the plane of
• Fig. 5 is a vertical section taken in the plane of
• Fig. 6 is a vertical section taken in the plane of
• Fig. 7 is a vertical section taken in the plane of in Fig. 2;
• Fig. 8 is an elevation of the back wall a heating compartment of the oven
• Fig. 9 is a perspective view of the oven of Fig. 1 but with top portions of the oven removed to show details;
• Fig. 10 is a top view of Fig. 9;
• FIG. 11 is a perspective view showing food-holding trays positioned in the heating compartments
• FIG. 12 is a perspective view of a side wall panel of a heating compartment
• Fig. 13 is a top view similar to Fig. 3; showing a dead zone of the oven;
• FIG. 14 is a perspective view of a second embodiment of a side wall panel of a heating compartment
• Fig. 15 is a front perspective of the oven;
• Fig. 16 is a front elevation of the oven of Fig. 15;
• Fig. 17 is a vertical sectional view taken through the oven in a plane extending in front-to-back direction showing the flow of heated air through a heating compartment of the oven;
• FIG. 18 is a front perspective view of a second embodiment of an oven of this invention.
• Fig. 19 is a vertical section taken in the plane of
• Fig. 19A is a perspective of one embodiment of a tray that can be used in the oven.
• Fig. 20 is a vertical section taken in the plane of
• Fig. 21 is a view similar to Fig. 18 but with top portions of the oven removed to show details;
• Fig. 22 is a top view of Fig. 20;
• Fig. 23 is an enlarged cross-sectional view of a gas flow opening in a side wall of a heating compartment
• Fig. 24 is a front perspective view of a third embodiment of an oven of this invention.
• Fig. 25 is a vertical section taken in the plane of
• Fig. 26 is a vertical section taken in the plane of
• an oven of this invention for heating food with heated gas is designated in its entirety by the reference number 20.
• the oven comprises a housing 22 having an outer box-like shell 24 with a left side 26, a right side 28, a top 32, a bottom 34, a back 36, and a front 38 which is partially open.
• the housing 24 also includes an inner shell or liner 40 spaced inward from the sides 26, 28, back 36 and top 32 of the outer shell 24 to form a space 42 for receiving suitable thermal insulation (see Fig. 3) .
• a louvered vent 43 is provided in the top 32 of the outer shell 24 for venting the space 42.
• the housing 22 defines an oven cavity 44 comprising at least one heating compartment 46 inside the liner 40.
• the cavity 44 comprises two side-by- side heating compartments, namely, a left heating compartment 46 and a right heating compartment 50.
• the number and arrangement of heating compartments can vary.
• the compartments may be arranged in vertical columns and horizontal rows, and the number of compartments in each column and each row may vary from one to two or more.
• the outer shell 24 and liner 40 of the housing 22 are constructed of suitable material, such as sheet metal.
• the left heating compartment 46 is generally rectangular and is defined by a left side wall comprising a left side wall panel 54, a right side wall comprising a right side panel 58, a back wall comprising a back panel 62, a top wall comprising a top panel 66, and a bottom wall comprising a bottom wall panel 70 spaced above the bottom 34 of the housing 24.
• the front of the left heating compartment 46 is open to the
• the left side panel 54 of the left heating compartment 46 is spaced from the inner liner 40 to define a left side gas plenum 72.
• the right heating compartment 50 is generally rectangular and defined by a left side wall comprising a left side wall panel 80, a right side wall comprising a right side panel 84, a back wall comprising back panel 88 (which may be an integral extension of the back panel 62 of the left heating compartment 46), a top wall comprising a top panel 92 (which may be an integral extension of the top panel 66 of the left heating compartment 46), and a bottom wall comprising a bottom wall panel 96 spaced above the bottom 34 of the housing 24.
• the front of the right heating compartment 50 is open to the environment surrounding the oven.
• the right side panel 84 of the right heating compartment 50 is spaced from the inner liner 40 to define a right side gas plenum 98.
• the right wall 58 of the left heating compartment 46 is spaced from the left wall 80 of the right heating compartment to define an
• the back panels 62, 88 of the two heating compartments 46, 50 are spaced forward of the inner liner 40 of the housing 22 to define a back gas plenum 106.
• the top panels 66, 92 of the two heating compartments 46, 50 are spaced below the inner liner 40 to define a top gas plenum 110.
• the various panels forming the gas plenums of the oven are of suitable material, such as sheet metal.
• each heating compartment 46, 50 are provided with gas flow openings 120, 124 for the circulation of hot gas into and out of the compartment.
• the left and right side walls 54, 58, 80, 84 of each compartment are provided with side wall openings 120
• the back wall 62, 88 of each heating compartment is provided with back wall openings 124 (Fig. 8) .
• the top panels 66, 92 forming the top walls of the two heating compartments 46, 50 have side openings 130 that communicate with respective left and right gas plenums 72, 98 of the heating compartments, and intermediate openings 134 that communicate with the intermediate gas plenum 102.
• the back gas plenum 106 is divided by a pair of spaced vertical partitions 140 into a left gas flow channel 142L communicating with the left heating compartment 46 and the top gas plenum 110, and a right gas flow channel 142R, separate from the left gas flow channel 142L, communicating with the right heating compartment 50 and the top gas plenum. As illustrated best in Figs. 4 and 6, each of these flow channels 142L, 142R extends substantially the full height of a respective
• the flow channels communicate with
• compartment 50 flows into the right gas flow channel 142R.
• a left blower 150L is suitably positioned in the left gas flow channel 142L, e.g., adjacent its upper end, for circulating gas along a gas flow path through the left heating compartment 46.
• gas from the blower 150L enters the top plenum 110; flows via respective left side and
• a right blower 150R is suitably
• gas from the right blower 150R enters the top plenum 110; flows via
• a left heater 160L is provided in the top plenum 110 generally at a location over the left heating compartment 46 for heating gas from the discharge of the left blower 150L.
• a right heater 160R is provided in the top plenum 110 generally at a location over the right heating compartment 50 for heating gas from the discharge of the right blower 150R.
• the heaters 160L, 160R can be placed immediately upstream from the blower inlets.
• each heater can comprise one or more electric resistance heating elements.
• a suitable support system 170 is provided for supporting food in each compartment at
• the support system 170 includes one or more supports 174, each of which comprises horizontal rods 176 having ends sized for reception in the openings 120 in the side walls panels of the heating compartment, and one or more food holders 180 (e.g., trays or racks) supported by the rods.
• the rods 176 are removable so that each holder 180 is adjustable up and down in the heating compartment, as needed or desired, simply by inserting the rods in a different set of side wall openings 120.
• each heating compartment 46, 50 has a side-to-side width of no more than about 14 inches, exemplary dimensions being anywhere in the range of 4-14 inches (e.g., 4, 6, 8, 10, 12, or 14 inches) .
• the relatively narrow width of each compartment 46, 50 insures that hot gas entering the heating compartment via the left and right side openings 120 contacts the entire surface of each food product in the
• each heating compartment 46, 50 are spaced a substantial distance rearward from the open front of the compartment to create a gas dead zone 200 at the front of each heating compartment extending substantially an entire height of the compartment and a full side-to-side width of the compartment.
• the zone 200 has a dimension in front-to-rear direction of at least 2 in., e.g., 2, 3, 4, 5, or 6 in. or more.
• the gas dead zone 200 is illustrated in Fig. 3.
• the gas dead zone 200 is also illustrated in Fig. 13 in the heating
• the gas dead zone 200 of this embodiment has a generally rectangular horizontal cross-section. In other words, a depth 200D of the gas dead zone 200 is substantially constant across the full side-to-side width of the compartment 50.
• the gas dead zone 200 may have different shapes, as discussed in more detail below.
• this zone 200 is substantially free of moving gas generated by the oven.
• the zone 200 acts as a thermal barrier for preventing
• compartment 46, 50 is closely controlled by the pattern and size of gas openings 120, 124 in the walls of the compartment.
• a representative arrangement of openings 120, 124 is described below for an oven in which each of the left and right heating compartments has a height of about 15.0 in., a width of about 8.0 in., and a depth of about 19.0 in.
• Fig. 4 illustrates the left panel 54 defining the left side wall of the left heating compartment 46.
• the gas flow openings 120 in the panel 54 are arranged in four vertical arrays A1-A4 spaced at different distances D1-D4 from the front of the heating compartment 46, e.g., 3.5 in., 8.0 in., 13.5 in., and 15.5 in., respectively. (Dl corresponds to the depth of the aforementioned gas dead zone 200.)
• Each array A1-A4 of openings comprises a matrix of columns and rows extending from adjacent the top of the panel 54 to adjacent the bottom of the panel.
• the width of the array Al i.e., the number of columns in the matrix
• the widths of the second, third, and fourth arrays A2-A4 are identical (two columns per array) .
• the openings have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Other dimensions are possible. Further, while the openings shown in the drawings are of the same size, they may differ in size.
• FIG. 5 illustrates the right panel 58 defining the right side wall of the left heating compartment 46.
• the gas flow openings 120 in the panel 58 are arranged in four vertical arrays A5-A8 spaced at different distances D5-D8 from the front of the heating compartment 46, e.g., 3.5 in., 8.0 in., 13.5 in., and 15.5 in., respectively.
• D5 corresponds to the depth J of the aforementioned gas dead zone 200.
• Each array A5-A8 of openings comprising a matrix of columns and rows extending from adjacent the top of the panel 58 to adjacent the bottom of the panel.
• the width of the array A5 (i.e., the number of columns in the matrix) varies in the vertical direction to form a series of relatively wide vertically-spaced clusters C4-C6 of openings.
• the clusters C4-C6 are staggered vertically with respect to the clusters C1-C3 of the left panel 54 to provide more uniform gas flow into the heating compartment 46.
• the widths of the arrays A6-A8 are identical (two columns per array) .
• the openings have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Other dimensions are possible. Further, while the openings shown in the drawings are of the same size, they may differ in size.
• Fig. 6 illustrates the left panel 80 of the right heating compartment 50.
• the gas flow openings 120 in the panel 80 are arranged in four vertical arrays A9-A12 spaced at different distances D9-D12 from the front of the heating compartment 50, e.g., 3.5 in., 8.0 in., 13.5 in., and 15.5 in., respectively.
• D9 corresponds to the depth of the
• Each array A9-A12 of openings comprises a matrix of columns and rows extending from adjacent the top of the panel 80 to adjacent the bottom of the panel.
• the width of the array A9 i.e., the number of columns in the matrix
• the widths of the arrays A6-A8 are identical (two columns per array) .
• the openings 120 have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Other dimensions are possible. Further, while the openings shown in the drawings are of the same size, they may differ in size. In the illustrated embodiment, the openings 120 in the panel 80 have the same pattern and size as the openings 120 in the right panel 58 of the left heating compartment 46.
• Fig. 7 illustrates the right panel 84 of the right heating compartment 50.
• the gas flow openings 120 in the panel 84 are arranged in four vertical arrays A13-A16 spaced at different distances D13-D16 from the front of the heating compartment 50, e.g., 3.5 in., 8.0 in., 13.5 in., and 15.5 in., respectively.
• D13 corresponds to the depth of the
• Each array A13-A16 of openings comprises a matrix of columns and rows extending from adjacent the top of the panel 84 to adjacent the bottom of the panel.
• the width of the array A13 i.e., the number of columns in the matrix
• the clusters C10-C12 are staggered vertically with respect to the clusters C7-C9 of the left panel 80 of the right heating compartment 50 to provide more uniform gas flow into the heating compartment.
• the widths of the arrays A14-A16 are identical (two columns per array) .
• the openings 120 have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Other dimensions are possible. Further, while the openings shown in the drawings are of the same size, they may differ in size. In the illustrated embodiment, the openings 120 in the panel 84 have the same pattern and size as the openings 120 in the left panel 54 of the left heating
• each heating compartment 46, 50 are arranged and sized such that gas is delivered
• the pattern and size of the openings 120 will vary according to such factors as the height, width, and depth dimensions of the heating compartment 46, 50, the number and vertical spacing of the food supports 174 in the compartment, and the velocity and volume of the gas flowing through the compartment.
• Fig. 8 illustrates the back panels 62, 88 defining the back walls of the left and right heating compartments 46, 50, respectively.
• the back panels 62, 88 are integrally formed as one piece of sheet metal. In other embodiments, they may be formed as separate panels.
• the openings 124 in the left panel 62 are arranged in a first array A17 providing communication between the left heating compartment 46 and the left gas flow channel 142L of the back plenum 106, and the openings 124 in the right panel 88 are arranged in a second array A18 (identical to the first array A17 in this embodiment) providing communication between the right heating compartment 50 and the right gas flow channel 142R of the back plenum 106.
• Each of the arrays A17, A18 comprises five vertically-spaced groups of openings, and each group comprises a matrix of columns and rows covering a major portion of the back wall of a respective compartment.
• the openings have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Other dimensions are possible.
• Fig. 10 illustrates the top panels 66, 92 defining the top walls of the left and right compartments 46, 50, respectively.
• Each group of side openings 130 includes a plurality of rectangular openings (three such openings being shown) for flow of gas from the top gas plenum 110 to respective side gas plenums 72, 98.
• the rear and center openings 130 closest the blowers 150L, 150R are smaller than the forward opening 130 farthest from the blowers to provide for a more uniform distribution of gas from the top plenum 110 to
• the group of intermediate openings 134 includes a plurality of rectangular openings (four such openings being shown) for flow of gas from the top gas plenum 110 to the intermediate gas plenum 102.
• the side and intermediate openings 130, 134 may vary in number and shape.
• the left and right heating compartments 46, 50 are of the same size. However, it will be understood that heating compartments may vary in size with respect to one another. Regardless of size, however, the arrangement of the gas flow openings 120, 124 should be such that the gas moving through the compartment has good heat transfer contact with the food substantially uniformly over the entire surface of the food in the compartment.
• the left and right blowers 150L, 150R used in the two-compartment oven described above may be tangential blowers, mounted side-by-side in a double housing such that the gas is discharged from the blowers through openings in a vertical flange 210 projecting up from the top panels 66, 92 (Fig. 9) .
• each blower may have an impeller diameter of 65 mm, a static pressure in its discharge plenum of about 0.036 IWC, and generate a gas flow rate of 165 cubic feet per minute.
• each of the left and right heaters 160L, 160R may include a first relatively longer finned electric heating element 214 extending widthwise of the oven and a second relatively shorter electric heating element 216 spaced rearward from and generally parallel to the first element.
• the elements 214, 216 of each heater 160L, 160R are secured to a respective top panel 66, 92 and extend between the side and intermediate openings 130, 134 of the panel above a respective heating compartment 46, 50. Other locations are possible.
• each heating element 214, 216 has a power output of 500 watts, for a total output of 1000 watts per heater 160L, 160R, but this power output will vary according to the heating requirements of the oven.
• the oven has a suitable control system 230 for operating the oven.
• the system is housed in a control housing 234 secured to the front 38 of the oven housing 22.
• the control system 230 includes an on/off power switch 238 and an operator input 240 for inputting desired operational information such as compartment temperature, heating time, and specific programs for heating (e.g., rethermalizing) and/or holding food in the oven.
• the control system 230 also includes a processor (not shown) for processing such information and controlling the blowers 250L, 250R and heaters 260L, 260R accordingly.
• blowers 150L, 150R may be controlled independent of one another, and such that the operation of the heaters 160L, 160R may be controlled independent of one another.
• a fan 250 is provided for circulating air through the control system housing 234 to cool the various electronic components of the control system.
• the oven 20 has a configuration similar to the first embodiment (Figs. 1-11) but is altered to have a modified circulation of gas into and out of the compartments 46, 50.
• gas flows into the compartments 46, 50 through the openings 120 in respective side walls 54 and 84, and gas flows out of the compartments through the openings 120 in respective side walls 58 and 80 as well as through the openings 124 in the back panels 62, 88.
• gas flows into each compartment 46, 50 through one wall 54, 84, and flows out of each compartment through two walls 58, 80, 62, 88.
• embodiment lacks the intermediate openings 134 that enable communication between the top gas plenum 110 and the
• the second embodiment has
• openings are provided in the vertical partitions 140 to enable communication among the space between the partitions and the left and right flow channels 142L, 142R.
• gas flow generated by the blowers 150L, 150R enters the top gas plenum 110; flows via the left side openings 130 in the top panel 66 down into the left gas plenum 72; flows via the gas flow openings 120 in the left panel 54 into the compartment 46; and exits the compartment via the openings 120 in the right panel 58 and the openings 124 in the back panel 62.
• Gas flow is returned to the blower 150L via the left gas flow channel 142L, which collects gas flow directly from the openings 124 in the back panel 62 and from the openings 120 in the side wall 58 through the intermediate gas plenum 102 and the space between the vertical partitions 140.
• gas flow generated by the blowers 150L, 150R enters the top gas plenum 110, flows via the right side openings 130 in the top panel 92 down into the right gas plenum 98; flows via the gas flow openings 120 in the right panel 84 into the compartment 50; and exits the compartment via the openings 120 in the left panel 80 and the openings 124 in the back panel 88.
• Gas flow is returned to the blower 150R via the right gas flow channel 142R, which collects gas flow directly from the openings 124 in the back panel 88 and from the openings 120 in the side wall 80 through the intermediate gas plenum 102 and the space between the vertical partitions 140.
• the arrangement of the gas flow openings 120, 124 may vary to accomplish a desired gas movement through the compartments 46, 50 to impart good heat transfer contact with the food substantially uniformly over the entire surface of the food in the compartments. For example, in one test, 75% of the openings in the rear panels 62 and 88 shown in Fig. 8 were absent or blocked. Other arrangements of the gas flow openings 120, 124 may be used to impart desired gas movement through the compartments 46, 50 to impart good heat transfer contact with the food substantially uniformly over the entire surface of the food.
• the oven 20 has a
• the third embodiment is different from the first embodiment in that the side wall panels of the third embodiment have at least some louvered gas flow openings 120L that direct gas exiting the left, right, and intermediate gas plenums 72, 98, and 102 through the louvered openings toward the rear of the heating compartments 46, 50.
• the louvered openings 120L assist in preventing substantial loss of heat from the heating
• compartments 46, 50 to ambient through the open fronts of the compartments. As a result, there is no need for a door at the front of each compartment.
• the side wall panel illustrated in Fig. 12 is configured for use as the left side panel 54 ' of the left side heating compartment 46 and/or the left side panel 80' of the right side heating compartment 50.
• the corresponding right side panels 58', 84' (not shown) are generally a mirror image of the illustrated panel 54', 58', but may be different.
• the gas flow openings 120, 120L of the panel 54', 80' are arranged in three vertical arrays A19-A21 spaced at different distances D17-D19 from the front of the heating compartment 46, e.g., 1.0 in., 5.0 in., and 14.5 in.,
• Each array A19-A21 of openings comprises a matrix of columns and rows extending from adjacent the top of the panel 54' to adjacent the bottom of the panel.
• the first array A19 comprises the louvered gas flow openings 120L.
• the array comprises six columns and three rows of louvered openings 120L. Louvers 120L' direct gas entering the compartment through the openings in a direction generally toward the rear of the
• louvers 120L' direct gas flow at an angle 275' (Fig. 13) less than or equal to seventy-five degrees with respect to the side wall panel 54'. In the illustrated embodiment, the angle 275' is approximately forty-five degrees. Accordingly, the louvered openings 120L assist in preventing substantial loss of heat from the heating compartment 46. In addition, the louvered openings 120L assist in directing heated gas toward the openings in the back wall panel 62 for return to the left gas flow channel 142L. Other types, configurations, and arrangements of louvered or baffled openings 120L may be used to accomplish desired gas flow .
• the third embodiment has a gas dead zone 200' at the front of the compartment similar to the first embodiment, but the gas dead zone 200' in the third embodiment has a different shape than in the first embodiment.
• Fig. 13 illustrates the gas dead zone 200 of the first embodiment in the right compartment 50 (i.e., the compartment 50 has left and right side wall panels 80, 84 as described with respect to the first embodiment), and illustrates the gas dead zone 200' of the third embodiment in the left compartment 46 (i.e., the compartment 46 has left and right side wall panels 54', 58' as described with respect to the third embodiment) .
• the gas dead zone 200 of the first embodiment has a generally rectangular horizontal cross-section.
• the depth 200D of the gas dead zone 200 is substantially constant across the full side-to side width of the compartment 50.
• the gas dead zone 200' has a generally trapezoidal horizontal cross-section. This
• the gas dead zone 200' extends substantially the entire height of the compartment 46 and the full side-to-side width of the compartment at the open front of the compartment.
• the gas dead zone 200' has a dimension (e.g., dimension 200D' shown in Figs. 12 and 13) in the front-to-rear direction of at least at least 2 in., e.g., 2, 3, 4, 5, or 6 in. or more.
• the depth 200D' of the gas dead zone 200' (i.e., the front to rear dimension of the gas dead zone) varies across the side-to-side width of the compartment 46.
• the depth 200D' tapers proximate the side wall panels 54', 58' from the open front toward the rear of the compartment 46 because of gas flow entering the compartment through the louvered openings 120L.
• the gas dead zone 200' tapers at generally the same angle 275' at which gas flows from the louvered openings 120L.
• Other embodiments may have gas dead zones of different or varying shapes .
• the gas dead zone 200' is substantially free of moving gas generated by the oven during operation of the oven 20.
• the gas dead zone 200' acts as a thermal barrier for preventing
• the second and third arrays A20 and A21 comprise openings 120 of similar size and shape as the openings 120 of the first embodiment.
• the openings 120 have a diameter of about 0.290 in., a vertical center-to-center spacing of about 0.50 in., and a horizontal center-to-center spacing of about 0.50 in. Varying numbers of arrays may be used, and arrays having different numbers or types of openings and different widths (i.e., different numbers of columns) may be used.
• the oven 20 has a
• a representative modified side wall panel 54", 58" of the fourth embodiment is illustrated in Fig. 14.
• the modified side wall panel 54", 58" of the fourth embodiment has openings 120C in at least one surface 300 of the side wall panel that is oriented toward the rear of the heating compartment 46.
• the openings 120C are provided in one or more surfaces 300 of the side wall panel 54", 58" that face or are angled toward the rear of the heating compartment 46.
• the gas flow openings 120, 120C of the panel 54", 58" are arranged in seven vertical arrays A22-A28 spaced at different distances D20-D26 from the front of the heating compartment 46, e.g., 1.5 in., 3.5 in., 5.5 in., 6 in., 8 in., 12 in., and 14 in., respectively.
• Each array A22-A28 of openings comprises a matrix of columns and rows extending from adjacent the top of the panel 54" to adjacent the bottom of the panel .
• the panel has a corrugated section 350 proximate the open front of the oven 20.
• the corrugated section 350 comprises ridges 351 extending vertically along the side wall panel 54", 58".
• Each ridge 351 comprises a surface 300 oriented generally toward the rear of the heating compartment and a surface 301 oriented generally toward the open front of the oven 20.
• the openings 120C of the first, second, and third arrays A22-A24 are provided on the surfaces 300 oriented toward the rear of the heating compartment 46.
• the surfaces 300 are oriented so that gas flowing from the openings 120C is directed generally toward the rear of the compartment 46 and toward the centerline 250 extending from the front to the rear of the compartment. Gas flows from the openings 120C at an angle 275" (Fig.
• the angle 275" is approximately forty- five degrees. Other angles may be used.
• the surfaces 300 may be oriented differently so that openings 120C in different ones of the surfaces direct gas flow toward the rear of the compartment 46 at different angles with respect to the side wall panel.
• the gas dead zone 200" of this embodiment is similar to the gas dead zone 200' of the third embodiment (i.e., the side wall panels 54", 58" of the fourth embodiment installed in the compartment 46 would produce approximately the same gas dead zone 200' as in the third embodiment) .
• the gas dead zone 200" has a depth 200D" that varies along the side-to-side width of the compartment 46. More specifically, the depth 200D" tapers proximate the side wall panels 54", 58" from the open front toward the rear of the compartment 46 because of gas flow entering the compartment through the openings 120C.
• the gas dead zone 200" tapers at generally the same angle 275" at which gas flows from the openings 120C.
• Other embodiments may have gas dead zones of different or varying shapes. As in previous embodiments, the gas dead zone 200" acts as a thermal barrier for preventing substantial loss of heat from the heating
• the fourth to seventh arrays A25-A28 may comprise openings 120 of similar size and shape as the openings 120 of the embodiments described above. Varying numbers of arrays may be used, and arrays having
• the oven 20 has a configuration similar to the first
• the openings 120 in the side wall panels 54, 58, 80, 84 may have various arrangements. In the illustrated arrangement, clusters C13 and C14 of openings 120 on each side wall panel 54, 58, 80, 84 extend along
• the baffles 400 overhang at least some of the openings 120 to direct gas flowing from those openings into the heating compartment 46 generally downward to contact food within the holder 180.
• the baffles 400 are desirably positioned vertically within the heating compartments 46, 50 with respect to the support system 170 in contemplation of characteristics (e.g., height, width) of the desired food holders 180 to be used so that gas deflected downward by the baffles 300 is directed from a suitable height and at a suitable angle 450 (Fig. 16) so that the gas flows through the open top of the holder and contacts the food in the holder when the holder is positioned on the support system 170.
• the angle 450 may be generally between five and seventy-five degrees with respect to the side wall panel.
• the angle is more desirably between twenty and sixty degrees, and more desirably between forty and fifty degrees. In the illustrated embodiment, the angle 450 is approximately forty- five degrees .
• baffles 400 extend approximately the entire front-to-rear depth of the heating compartments 46, 50, but baffles of other lengths may be used. In addition other types of baffles may be used. For example, louvered openings may be used to direct flow of gas as desired.
• the oven 20 again has a configuration similar to the first
• the oven includes vanes 500 positioned and supported within the left, right, and/or
• intermediate gas plenums 72, 98, 102 to counteract forward velocity of gas flowing within the plenums to prevent the gas from breaching the gas dead zone 200 in the front of the
• FIG. 17 illustrates representative vanes 500 positioned and supported in the intermediate plenum 102.
• gas from the left blower 150L travels along the top gas plenum 110, flows into the intermediate gas plenum 102, and then flows into the heating compartment 46 via the openings 120 in the right side wall panel 58.
• Some gas entering the heating compartment 46 may tend to flow toward the open front of the oven 20 as a result of the gas molecules having residual velocity in that direction from the blower 150L.
• the vanes 500 desirably substantially counteract residual forward velocity to prevent gas molecules entering the heating compartment 46 from breaching the gas dead zone 200 in the front of the compartment to prevent substantial loss of heat from the heating
• vanes 500 may be configured to turn the flow of gas toward the rear of the compartment 46 so that the gas molecules tend to flow toward the rear of the
• Gas dead zones as described herein may have
• gas dead zone 200 and the gas dead zones 200' and 200" have
• gas dead zones may have different horizontal cross-sections.
• a gas dead zone may have a generally triangular horizontal cross section.
• the gas dead zone has the same horizontal cross-section (e.g., rectangular or trapezoidal) over
• FIGs. 18-23 show another embodiment of an air handling unit or oven of this invention, generally designated 500.
• the oven 500 is similar in construction to the oven 20 of the first embodiment.
• the oven 500 comprises a housing 504 defining an oven cavity comprising a plurality of side-by-side heating compartments 508. (Five such compartments 508 are shown but this number can vary.) Desirably, each heating compartment has a side-to-side width of no more than about 14 inches.
• Heated air is circulated through the compartments 508 in much the same manner as in the oven 20 of the first embodiment.
• blowers 512 positioned at the upper end of a rear plenum 516 in the oven blow air over electric resistance heaters 520 positioned in an upper plenum 524 of the oven (see Fig. 19) .
• the heated air flows down through openings 528 into plenums 534 at opposite sides of the heating compartments 508 and then into the compartments 508 through gas flow openings 540 in the left and right side walls 544, 548 of the compartments (Figs. 20-22) .
• Air from the heating compartments 508 is exhausted into the rear plenum 516 through openings 550 in the back walls 556 of the compartments (see Fig. 20) .
• the oven 500 differs from the previous embodiments in that it has no dead zone at the open front 560 of each compartment 508. Further, unlike prior art ovens, there is no air curtain at the open front 560 of each compartment.
• FIG. 23 illustrates one such gas flow opening 540 in a respective side wall 544, 548.
• the opening 540 is generally oval in shape, having a longitudinal axis 564, and comprises an angled nozzle 570 that directs air flowing through the opening at an acute angle 574 in the range of 10-45 degrees (e.g., about 15 degrees) relative to the side wall.
• Other gas flow openings are generally oval in shape, having a longitudinal axis 564, and comprises an angled nozzle 570 that directs air flowing through the opening at an acute angle 574 in the range of 10-45 degrees (e.g., about 15 degrees) relative to the side wall.
• supports 580 are provided on the side walls 544, 548 of the heating compartments 508 for supporting trays 582 at vertically spaced elevations in the heating compartment.
• the trays have outwardly projecting peripheral flanges 584 around their open tops.
• the flanges 584 are dimensioned to rest on the supports 580 such that trays hang down from the supports.
• Other supporting arrangements are possible.
• the supports 580 are configured for
• inclination 586 (e.g., 10- 20 degrees) allows a user of the oven to readily observe the contents of the trays.
• the gas flow openings 540 are grouped in a plurality of arrays 590 comprising vertical columns of openings and rows of openings 540 extending generally in front-to-back direction with respect to the heating compartment.
• the arrays 590 are spaced at vertical intervals at locations corresponding to the areas above the supports 580 and the open tops of the trays 582. Further, the arrays 590 are configured to extend generally at the same angle of inclination 586 as the supports 580 and trays 582 (e.g., 10-20 degrees) .
• each array 590 as a whole is upwardly inclined toward the back wall 556 of the compartment 508, the longitudinal axis 564 of each individual opening 540 extends generally horizontally.
• the arrangement is such that heated air discharged through the gas flow openings 540 of each array 590 passes over the top of any tray supported immediately below the array and under the bottom of any tray supported immediately above the array. As a result, food in each tray is uniformly heated from above and below.
• Generally horizontal arrays 596 of gas flow openings 540 are provided adjacent the lower ends of the side walls 544, 548 of each heating compartment 508. During operation of the oven 500, heated air flowing through these arrays 596 of openings functions to warm cooler make-up air flowing into the heating compartments 508 via the open fronts 560 of the compartments.
• an air deflector 600 is mounted adjacent the upper end of each heating compartment 508 for deflecting heated air into the heating compartment.
• the air deflector 600 comprises a single rectangular transparent panel (also designated 600) extending across the open fronts 560 of all five heating compartments 508.
• a separate air deflector can be provided for each compartment.
• the deflector 600 is pivoted on brackets 606 at the front of the oven housing 504 for movement between a raised position (shown in phantom lines in Fig. 19) to enable removal of one or more trays 582 from a heating compartment or compartments 508 and a lowered operative position (shown in solid lines in Fig.
• a holder 610 is provided on the deflector for holding a menu, instructions, or other material to be observed by a user of the oven.
• each compartment has an overall vertical height represented by the dimension 602.
• the air deflector 600 is dimensioned such that, when in its lowered position, it has a vertical height
• the ratio of dimension 604 to 602 is less than one-half, and even more desirably no more than about one-third.
• the air deflector panel 600 desirably rests on support members 614 adjacent opposite sides of the oven housing 504 (Figs. 18 and 19) .
• These support members 614 support the panel at an acute angle 620 (e.g., 15 degrees) sloping in a forward direction down and away from the open front 560 of each compartment 508. This slope increases the volume of heated gas deflected by the panel back into the heated compartments.
• the air deflector 600 may assume a substantially vertical orientation when in its lowered position.
• Figs. 24-26 show another embodiment of an oven of this invention, generally designated 700.
• the oven 700 is similar to the oven 20 of the first embodiment.
• Supports 704 are provided for supporting trays 708 in a generally horizontal orientation (with no substantial upward tilt) .
• openings 710 in the side walls of each heating compartment are configured in generally horizontal arrays at locations generally corresponding to the areas above the open tops of the trays 708. Heated gas discharged through the openings 710 of each array 714 flows across the top of any tray 708 immediately below the array and flows across the bottom of any tray immediately above the array. Heated gas exits each heating chamber 720 through openings (not shown) in the back wall 724, as described in previous embodiments.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Baking, Grill, Roasting (AREA)
• Electric Stoves And Ranges (AREA)

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• 2011
  • 2011-03-17 CN CN2011800237702A patent/CN102893091A/zh active Pending
  • 2011-03-17 WO PCT/US2011/028786 patent/WO2011116170A2/en active Application Filing
  • 2011-03-17 AU AU2011227241A patent/AU2011227241B2/en not_active Expired - Fee Related
  • 2011-03-17 KR KR1020127026937A patent/KR20130052556A/ko not_active Application Discontinuation
  • 2011-03-17 EP EP11756983.0A patent/EP2547962A4/de not_active Withdrawn

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