Oven with movable jet plate

Abstract

An oven, the oven comprising: a cooking chamber; a blower; the air pressure stabilizing cavity is configured to receive air from the air blower; and a first jet plate and a second jet plate disposed within the cooking chamber and configured to guide a flow of air from the air pressure stabilizing chamber into the cooking chamber to cook food. Each of the first jet plate and the second jet plate includes one or more openings. At least one of the first jet plate and the second jet plate is movable relative to the other jet plate to provide an impingement airflow to the cooking chamber in a first configuration and a convective airflow to the cooking chamber in a second configuration. At least one of the first and second spray plates is movable relative to the other spray plate to periodically swing during a single cooking setting to provide impingement airflow to the first and second regions of the food product.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of and priority to U.S. patent application No. 18 / 101,433, filed January 25, 2023; the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention generally relates to a cooking appliance, and more particularly to a hot air oven with a movable spray plate. Background Art

[0004] Food service operators who wish to cook a variety of food products often use different types of hot air ovens to cook different types of food. For example, to achieve the best cooking quality in the shortest cooking time, baked goods or frozen cookies might be cooked in a convection oven, while pizza might be cooked in an impingement oven. Conventional hot air ovens with multiple cooking chambers can cook different types of food, but they are not well suited to cooking foods typically cooked in convection ovens and foods typically cooked in impingement ovens within the cooking time and quality standards typically achieved in competing convection and impingement ovens.

[0005] Therefore, there is a need for an improved hot air oven with multiple cooking chambers that overcomes the above problems. Summary of the Invention

[0006] It has now been discovered that the foregoing and related objects of the present invention are achieved in the form of several related aspects, including an oven having a movable spray plate.

[0007] According to an exemplary embodiment of the present invention, an oven includes: a cooking cavity; a blower; an air plenum configured to receive air from the blower; and a first injection plate and a second injection plate disposed within the cooking cavity and configured to direct airflow from the air plenum into the cooking cavity. Each of the first and second injection plates includes a plurality of openings, and at least one of the first and second injection plates is movable relative to the other to provide an airflow having a first heat transfer characteristic to the cooking cavity in a first configuration and an airflow having a second heat transfer characteristic to the cooking cavity in a second configuration.

[0008] In an embodiment, the first injection plate is fixed and the second injection plate is movable relative to the first injection plate.

[0009] In an embodiment, the first injection plate and the second injection plate are movable relative to each other.

[0010] In an embodiment, the heat transfer coefficient h of the airflow having the first heat transfer characteristic is greater than about 41 W / m 2 Kelvin.

[0011] In an embodiment, the first heat transfer characteristic is an impingement heat transfer characteristic.

[0012] In an embodiment, the heat transfer coefficient h of the airflow having the second heat transfer characteristic is less than about 40 W / m 2 Kelvin.

[0013] In an embodiment, the second heat transfer characteristic is a convective heat transfer characteristic.

[0014] In an embodiment, the plurality of openings in the first injection plate comprises a plurality of holes.

[0015] In an embodiment, in the first configuration, some of the plurality of holes are open and the remaining holes of the plurality of holes are closed.

[0016] In an embodiment, in the first configuration, approximately half of the plurality of holes are open and approximately half of the plurality of holes are closed.

[0017] In an embodiment, in the second configuration, all of the holes in the plurality of holes are open and have reduced diameter.

[0018] In an embodiment, the total area of ​​the open pores in the first configuration is substantially the same as the total area of ​​the open pores in the second configuration.

[0019] In an embodiment, in the first configuration and in the second configuration, the air flow from the air plenum into the cooking cavity is uniform across the first injection plate and the second injection plate.

[0020] According to an exemplary embodiment of the present invention, an oven includes: a cooking cavity configured to receive food; a blower; an air plenum configured to receive air from the blower; and first and second injection plates disposed within the cooking cavity and configured to direct airflow from the air plenum into the cooking cavity to cook the food. Each of the first and second injection plates includes one or more openings, and at least one of the first and second injection plates is movable relative to the other to periodically oscillate between a first configuration in which the first and second injection plates provide airflow to a first area of ​​the food and a second configuration in which the first and second injection plates provide airflow to a second area of ​​the food during a single cooking session.

[0021] In an embodiment, the first injection plate is fixed and the second injection plate is movable relative to the first injection plate.

[0022] In an embodiment, the first injection plate and the second injection plate are movable relative to each other.

[0023] In an embodiment, the single cooking setting includes an impingement cooking setting.

[0024] In an embodiment, the air flow has impingement heat transfer characteristics.

[0025] In an embodiment, the heat transfer coefficient h of the airflow is greater than about 41 W / m 2 Kelvin.

[0026] According to an exemplary embodiment of the present invention, a jet plate assembly for directing an air flow into a cooking cavity of an oven includes: a first jet plate including one or more openings and disposed within the cooking cavity; a second jet plate including one or more openings and disposed vertically adjacent to the first jet plate; and a mechanism configured to move at least one of the first jet plate and the second jet plate relative to the other jet plate to provide an air flow having a first heat transfer characteristic in a first configuration and an air flow having a second heat transfer characteristic in a second configuration.

[0027] In an embodiment, the first injection plate is fixed, and the second injection plate is movable in a front-to-rear direction relative to the first injection plate.

[0028] In an embodiment, the first injection plate and the second injection plate are movable leftward and rightward relative to each other.

[0029] In an embodiment, the first injection plate and the second injection plate are movable relative to each other in a front-to-rear direction.

[0030] In an embodiment, the first injection plate and the second injection plate are movable leftward and rightward relative to each other.

[0031] In an embodiment, the heat transfer coefficient h of the airflow having the first heat transfer characteristic is greater than about 41 W / m 2 Kelvin.

[0032] In an embodiment, the first heat transfer characteristic is an impingement heat transfer characteristic.

[0033] In an embodiment, the heat transfer coefficient h of the airflow having the second heat transfer characteristic is less than about 40 W / m2·K.

[0034] In an embodiment, the second heat transfer characteristic is a convective heat transfer characteristic.

[0035] In an embodiment, the mechanism includes a Y-shaped member coupled to at least one of the first and second injection plates, wherein at least one of the first and second injection plates moves in response to rotation of the Y-shaped member.

[0036] According to an exemplary embodiment of the present invention, a jet plate assembly for directing air flow into a cooking chamber of an oven includes: a first jet plate including one or more openings and disposed in the cooking chamber; a second jet plate including one or more openings and disposed vertically adjacent to the first jet plate; and a mechanism configured to move at least one of the first jet plate and the second jet plate relative to the other jet plate to periodically oscillate between a first configuration in which the first jet plate and the second jet plate provide air flow to a first area of ​​a food product and a second configuration in which the first jet plate and the second jet plate provide air flow to a second area of ​​the food product during a single cooking setting.

[0037] In an embodiment, the first injection plate is fixed, and the second injection plate is movable in a front-to-rear direction relative to the first injection plate.

[0038] In an embodiment, the first injection plate is fixed, and the second injection plate is movable left and right relative to the first injection plate.

[0039] In an embodiment, the first injection plate and the second injection plate are movable relative to each other in a front-to-rear direction.

[0040] In an embodiment, the first injection plate and the second injection plate are movable leftward and rightward relative to each other.

[0041] In an embodiment, the single cooking setting includes an impingement cooking setting.

[0042] In an embodiment, the air flow has impingement heat transfer characteristics.

[0043] In an embodiment, the heat transfer coefficient h of the airflow is greater than about 41 W / m 2 Kelvin.

[0044] In an embodiment, the mechanism includes a Y-shaped member coupled to at least one of the first and second injection plates, wherein at least one of the first and second injection plates moves in response to rotation of the Y-shaped member. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The following detailed description, which is given by way of example and is not intended to limit the present invention thereto, will be better understood in conjunction with the accompanying drawings, in which:

[0046] Figure 1 is a perspective view of a movable spray plate according to an exemplary embodiment of the present invention, wherein the movable spray plate is in a first configuration.

[0047] Figure 2 is a perspective view of a movable spray plate according to an exemplary embodiment of the present invention, wherein the movable spray plate is in a second configuration.

[0048] Figure 3 A convection configuration of a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0049] Figure 4 Provided Figure 3 Another view of the convection configuration of the spray plate assembly is shown in .

[0050] Figure 5 An impingement configuration of a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0051] Figure 6 Provided Figure 5 Another view of the impingement configuration of the spray plate assembly is shown in FIG.

[0052] Figure 7 A first impact configuration of the jet plate assembly is depicted oscillating between two impact configurations.

[0053] Figure 8 A second impact configuration of the jet plate assembly is depicted oscillating between the two impact configurations.

[0054] Figure 9 A drive mechanism for a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0055] Figure 10 A drive mechanism for a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0056] Figure 11 A method for providing vertical spacing between spray plates in a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0057] Figure 12 Another method for providing vertical spacing between spray plates in a spray plate assembly according to an exemplary embodiment of the present invention is shown.

[0058] Figure 13 A cross-sectional view of an oven according to an exemplary embodiment of the present invention is shown.

[0059] Figure 14 A multi-chamber oven according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0060] Throughout this disclosure, like reference numerals refer to like elements throughout the drawings showing various exemplary embodiments of the present invention.

[0061] Referring now to the accompanying drawings, and in particular to Figure 1 and Figure 2, which depicts a jet plate assembly 100 for introducing air into a cooking chamber of an oven according to an exemplary embodiment of the present invention. The jet plate assembly 100 includes a fixed outer jet plate 102 and an inner jet plate 104 disposed vertically adjacent to the outer jet plate 102 and movable back-and-forth and / or left-to-right relative to the outer jet plate 102. In an alternative embodiment according to the present invention, both the jet plates 102, 104 are movable back-and-forth and / or left-to-right relative to each other.

[0062] Figure 1 The inner jet plate 104 is depicted disposed in a rearward position relative to the outer jet plate 102 (ie, with the leading edge 110 of the inner jet plate 104 farthest from the leading edge 112 of the outer jet plate 102 ). Figure 2 The inner jet plate 104 is depicted as being positioned forward relative to the outer jet plate 102 (i.e., with the front edge 110 of the inner jet plate 104 closest to the front edge 112 of the outer jet plate 102). As described above, in alternative embodiments, the inner jet plate 104 can be moved side-to-side relative to the outer jet plate 102 (i.e., with the side edges of the inner jet plate 104 closest to the corresponding side edges of the outer jet plate 102).

[0063] As discussed in detail below, a benefit of moving the inner spray plate 104 back and forth (and / or side to side) relative to the outer spray plate 102 is that it shifts the heat transfer characteristics of the airflow provided to the oven by the spray plate assembly 100 between impingement and convection. In terms of heat transfer coefficient (h), airflow having a heat transfer coefficient h of less than about 40 W / m2·K is considered to indicate convective heat transfer characteristics, while airflow having a heat transfer coefficient h of greater than about 41 W / m2·K is considered to indicate impingement heat transfer characteristics.

[0064] like Figure 2 As shown in FIG, a plurality of openings, such as holes 106 and slots 108, are formed in the inner injection plate 104. Figure 3 , a plurality of openings, such as holes 114, are formed in a surface 116 of the outer spray plate 102. According to an exemplary embodiment of the present invention, the openings in the spray plates 102, 104 are configured such that air passing through the spray plates 102, 104 exits the spray plate assembly 100 at a substantially similar velocity from all regions of the spray plate assembly 100 (i.e., the front of the spray plate assembly 100, the rear of the spray plate assembly 100, each side of the spray plate assembly 100, and the center of the spray plate assembly 100). This is also true when the spray plate assembly 100 is configured in an impingement configuration (described below) and when the spray plate assembly 100 is configured in a convection configuration (described below), although the exit velocity of the air in the impingement configuration may be different than the exit velocity of the air in the convection configuration.

[0065] According to an exemplary embodiment of the present invention, relative movement between the inner and outer injection plates 104, 102 causes the apertures 114 to be either fully open, partially open (ie, open but with a reduced diameter), or closed. Figure 3 and Figure 4 A configuration of the jet plate assembly 100 is depicted in which the inner jet plate 104 is moved relative to the outer jet plate 102 such that all of the holes 114 of the surface 116 are open but of reduced diameter (i.e., partially open). This configuration of the jet plate assembly 100 is considered a convection configuration because all of the holes 114 are utilized, but each hole is substantially smaller. Consequently, the air provided to the oven's cooking chamber through the holes 114 in the convection configuration of the jet plate assembly 100 is gently applied, with the vertically disposed air having a temperature of approximately 350°F, which is suitable for cooking foods such as pastry products or frozen cookies.

[0066] Figure 5 and Figure 6 The jet plate assembly 100 is depicted in a configuration in which the inner jet plate 104 is moved relative to the outer jet plate 102 such that half of the holes 118 of the surface 116 are open and half of the holes 120 are blocked. This configuration of the jet plate assembly 100 is considered an impingement configuration because only half of the holes 118 are used, but each hole is fully open. Therefore, the air provided to the oven's cooking chamber through the holes 118 in the impingement configuration of the jet plate assembly 100 is high-velocity air that, when applied at a temperature of approximately 500°F, is suitable for cooking food items such as a 16-inch pizza or frozen chicken wings.

[0067] The purpose of providing smaller diameter holes 114 in the convection configuration of the jet plate assembly 100 (where all holes 114 are open) and larger diameter holes 118 in the impingement configuration of the jet plate assembly 100 (where some holes are blocked) is to keep the total area of ​​open holes the same between the two configurations. In theory, this will keep the internal pressure within the jet plate assembly 100 similar between the two configurations, which will result in uniform airflow throughout the entire jet plate assembly 100 in either configuration.

[0068] Figure 7 and Figure 8 A configuration of the jet plate assembly 100 is depicted in which the inner jet plate 104 moves relative to the outer jet plate 102 such that the jet plate assembly 100 oscillates between two impact configurations. Figure 7 and Figure 8 As shown in FIG, in one impact configuration, half of the holes 118 are open and half of the holes 120 are closed. Figure 8 As shown in , in the second impact configuration, Figure 7The open holes 118 shown in FIG. 1 are converted to closed holes 120. This dual-impact configuration is beneficial in that it can reduce spotting on food. Specifically, by moving the inner spray plate 104 forward or backward (and / or left or right) relative to the outer spray plate 102, the heat intensity is shifted from the already hot area of ​​the food to the cooler area of ​​the food. This allows the hot area of ​​the food time to rest and dissipate heat while another area of ​​the food is heated.

[0069] Figure 9 and Figure 10 Operation of the drive mechanism 122 for moving the inner jet plate 104 back and forth relative to the outer jet plate 102 is depicted. Figure 9 The inner jet plate 104 is depicted moving forward relative to the outer jet plate 102. The Y-shaped member 124 rotates counterclockwise, thereby causing the portion 126 of the Y-shaped member 124 to enter the slot 132 of the inner jet plate 104. As the Y-shaped member 124 continues to rotate, the portion 126 of the Y-shaped member 124 contacts the tab 130 of the inner jet plate 104, causing the inner jet plate 104 to move forward relative to the outer jet plate 102.

[0070] Figure 10 The inner jet plate 104 is depicted moving rearward relative to the outer jet plate 102. The Y-shaped member 124 rotates clockwise, thereby causing the portion 128 of the Y-shaped member 124 to enter the slot 134 of the inner jet plate 104. As the Y-shaped member 124 continues to rotate, the portion 128 of the Y-shaped member 124 contacts the tab 136 of the inner jet plate 104, causing the inner jet plate 104 to move rearward relative to the outer jet plate 102.

[0071] In an alternative embodiment, if the injection plate 102 is also movable, a drive mechanism 122 may also be provided to move the injection plate 102 forward and backward relative to the injection plate 104. In an alternative embodiment, if the injection plate 102 and / or the injection plate 104 are movable left and right relative to each other, one or more drive mechanisms (such as the drive mechanism 122) may be provided to move the injection plate 102 and / or the injection plate 104 left and right.

[0072] Figure 11 and Figure 12 Two methods are depicted that can be used to provide vertical spacing between the inner and outer injection plates 104, 102. Figure 11 As shown in FIG, threaded posts 140 are provided at several locations between the outer injection plate 102 and the inner injection plate 104 through the slots 108. Screws 142 having a larger diameter than the threaded posts 140 and washers 144 are provided together with the threaded posts 140 to maintain the vertical spacing between the outer injection plate 102 and the inner injection plate 104 while allowing relative movement between the outer injection plate 102 and the inner injection plate 104 in the front-to-back direction (and / or left-to-right direction).

[0073] exist Figure 12 In the alternative embodiment shown in FIG, tabs 146 are provided at several locations between the outer jet plate 102 and the inner jet plate 104 via slots 148 into which the tabs 146 fit. The tabs 146 and their corresponding slots 148 maintain the vertical spacing between the outer jet plate 102 and the inner jet plate 104 while allowing relative movement between the outer jet plate 102 and the inner jet plate 104 in the front-to-back direction (and / or left-to-right direction).

[0074] Providing vertical spacing between the outer and inner spray plates 102, 104 helps control warping of the outer and inner spray plates 102, 104 when heated in the oven's cooking chamber. Controlling warping of the outer and inner spray plates 102, 104 increases the likelihood of achieving consistent cooking results.

[0075] In a preferred embodiment, the spray plate assembly 100, including the outer spray plate 102 and the inner spray plate 104, is made of stainless steel to enable the spray plate assembly 100 to better withstand the environment in the cooking chamber of the oven (e.g., high temperature, presence of grease). However, other materials may be used in alternative embodiments.

[0076] Figure 13 Depicted is a cross-sectional view of an oven 200 according to an exemplary embodiment of the present invention. Figure 13 As shown in FIG, the blower system 202 delivers heated air through openings in the rear wall 210 to the air plenum 204 located above the cooking cavity 206 and to the air plenum 208 located below the cooking cavity 206. The heated air received in the air plenum 204 is then directed downwardly into the cooking cavity 206 through the top spray plate assembly 100. The heated air received in the air plenum 208 is directed upwardly into the cooking cavity 206 through the bottom spray plate assembly 100. As the heated air enters the cooking cavity 206, it comes into contact with any food placed on one or more food shelves (not shown) within the cooking cavity 206. The air within the cooking cavity 206 is then drawn toward return air openings in one or more oven cavity walls (not shown) and returned to the blower system 202. As described herein, the oven 200 includes the spray plate assembly 100 for both the air plenum 204 and the air plenum 208 of the oven 200. In alternative embodiments, the oven 200 may include a spray plate assembly 100 for only the air plenum 204 or only the air plenum 208 .

[0077] Figure 14 A multi-cavity oven 300 is shown according to an exemplary embodiment of the present invention. In a preferred embodiment, oven 300 has four cooking chambers (i.e., is a "quad batch" oven), but oven 300 may have more or less than four cooking chambers. Figure 14 As shown in FIG, the four cooking chambers of oven 300 comprise four independent, stacked cooking chambers 206 of ovens 200. Each oven 200 includes a spray plate assembly 100 in both the top and bottom of the cooking chamber 206. (As described above, in alternative embodiments, each oven 200 may include a spray plate assembly 100 in only the top or bottom of the cooking chamber 206.) Each oven 200 is separated by insulation 302. The separation between the ovens 200 and the insulation 302 disposed between the ovens 200 enable a large temperature difference (e.g., greater than about 75°F) between adjacent cooking chambers 206 in the oven 300.

[0078] As described, according to embodiments of the present invention, an oven can quickly and evenly "convection cook" foods that require gently applied 350°F air (such as frozen cookies) or quickly and evenly "impact cook" foods that require high-velocity 500°F air (such as a 16-inch pizza), depending on the needs. This "contextual airflow" feature (i.e., whether convection cooking or impingement cooking is performed in the oven depending on the food being cooked in the oven) is achieved by at least one ejector plate being movable relative to another ejector plate to alter the heat transfer characteristics of the airflow provided to the oven between impingement and convection heat transfer characteristics. In a hot air oven having multiple cooking chambers, the multiple cooking chambers are separated and insulated to enable large temperature differences between adjacent cooking chambers.

[0079] Although the present invention has been described in conjunction with the exemplary embodiments summarized above and shown in the accompanying drawings, it is apparent that many alternatives, modifications and variations in form and details will be apparent to those skilled in the art. Therefore, the exemplary embodiments of the present invention as set forth above are intended to be illustrative rather than restrictive, and the spirit and scope of the present invention should be broadly interpreted and limited only by the appended claims and not by the foregoing description.

Claims

1. An oven, comprising: cooking chamber; Blower; an air plenum configured to receive air from the blower; as well as a first injection plate and a second injection plate disposed within the cooking cavity and configured to direct air flow from the air plenum into the cooking cavity; in: Each of the first injection plate and the second injection plate includes a plurality of openings; and At least one of the first and second injection plates is movable relative to the other injection plate to provide airflow having first heat transfer characteristics to the cooking cavity in a first configuration and to provide airflow having second heat transfer characteristics to the cooking cavity in a second configuration. 2 . The oven of claim 1 , wherein the first injection plate is fixed and the second injection plate is movable relative to the first injection plate. 3 . The oven of claim 1 , wherein the first injection plate and the second injection plate are movable relative to each other.

4. The oven of claim 1 , wherein the heat transfer coefficient h of the airflow having the first heat transfer characteristic is greater than about 41 W / m 2 Kelvin. The oven of claim 1 , wherein the first heat transfer characteristic is an impingement heat transfer characteristic.

6. The oven of claim 1 , wherein the heat transfer coefficient h of the airflow having the second heat transfer characteristic is less than about 40 W / m 2 Kelvin. The oven of claim 1 , wherein the second heat transfer characteristic is a convective heat transfer characteristic.

8. The oven of claim 1, wherein the plurality of openings in the first spray plate comprises a plurality of holes.

9. The oven of claim 8, wherein in the first configuration, some of the plurality of holes are open and the remaining holes of the plurality of holes are closed.

10. The oven of claim 9, wherein approximately half of the plurality of holes are open and approximately half of the plurality of holes are closed.

11. The oven of claim 8, wherein in the second configuration, all of the holes in the plurality of holes are open and have a reduced diameter.

12. The oven according to claim 8, wherein: In the first configuration, some of the plurality of holes are open, while the remaining holes in the plurality of holes are closed; In the second configuration, all of the plurality of apertures are open and have reduced diameters; and The total area of ​​the holes open in the first configuration is substantially the same as the total area of ​​the holes open in the second configuration.

13. The oven of claim 1, wherein in the first configuration and in the second configuration, the air flow from the air plenum into the cooking cavity is uniform across the first and second injection plates.

14. An oven, comprising: a cooking cavity configured to receive a food item; Blower; an air plenum configured to receive air from the blower; as well as a first injection plate and a second injection plate disposed within the cooking cavity and configured to direct air flow from the air plenum into the cooking cavity to cook the food; in: Each of the first and second injection plates includes one or more openings; and At least one of the first and second jet plates is movable relative to the other jet plate to periodically oscillate between a first configuration in which the first and second jet plates provide airflow to a first area of ​​the food product and a second configuration in which the first and second jet plates provide airflow to a second area of ​​the food product during a single cooking setting.

15. The oven of claim 14, wherein the first spray plate is fixed and the second spray plate is movable relative to the first spray plate.

16. The oven of claim 14, wherein the first and second injection plates are movable relative to each other.

17. The oven of claim 14, wherein the single cooking setting comprises an impingement cooking setting.

18. The oven of claim 14, wherein the airflow has impingement heat transfer characteristics.

19. The oven of claim 14, wherein the heat transfer coefficient h of the airflow is greater than about 41 W / m2·K.

20. A spray plate assembly for directing air flow into a cooking chamber of an oven, the spray plate assembly comprising: a first injection plate comprising one or more openings and disposed within the cooking cavity; a second injection plate comprising one or more openings and disposed vertically adjacent to the first injection plate; as well as A mechanism is configured to move at least one of the first and second ejector plates relative to the other ejector plate to provide an airflow having a first heat transfer characteristic in a first configuration and an airflow having a second heat transfer characteristic in a second configuration.

21. The spray plate assembly of claim 20, wherein the first spray plate is fixed and the second spray plate is movable in a front-to-rear direction relative to the first spray plate.

22. The spray plate assembly of claim 20, wherein the first spray plate is fixed and the second spray plate is movable left and right relative to the first spray plate.

23. The spray plate assembly of claim 20, wherein the first spray plate and the second spray plate are movable in a front-to-rear direction relative to each other.

24. The spray plate assembly of claim 20, wherein the first spray plate and the second spray plate are movable left-right relative to each other.

25. The spray plate assembly of claim 20, wherein the heat transfer coefficient h of the air flow having the first heat transfer characteristic is greater than about 41 W / m2·Kelvin.

26. The spray plate assembly of claim 20, wherein the first heat transfer characteristic is an impingement heat transfer characteristic.

27. The spray plate assembly of claim 20, wherein the heat transfer coefficient h of the airflow having the second heat transfer characteristic is less than about 40 W / m2·Kelvin.

28. The spray plate assembly of claim 20, wherein the second heat transfer characteristic is a convective heat transfer characteristic.

29. The jet plate assembly of claim 20, wherein the mechanism comprises a Y-shaped member coupled to at least one of the first and second jet plates, wherein the at least one of the first and second jet plates moves in response to rotation of the Y-shaped member.

30. A spray plate assembly for directing air flow into a cooking chamber of an oven, the spray plate assembly comprising: a first injection plate comprising one or more openings and disposed within the cooking cavity; a second injection plate comprising one or more openings and disposed vertically adjacent to the first injection plate; as well as a mechanism configured to move at least one of the first and second jet plates relative to the other jet plate to periodically oscillate between a first configuration in which the first and second jet plates provide airflow to a first area of ​​a food product and a second configuration in which the first and second jet plates provide airflow to a second area of ​​the food product during a single cooking setting.

31. The spray plate assembly of claim 30, wherein the first spray plate is fixed and the second spray plate is movable in a fore-aft direction relative to the first spray plate.

32. The spray plate assembly of claim 30, wherein the first spray plate is fixed and the second spray plate is movable left and right relative to the first spray plate.

33. The spray plate assembly of claim 30, wherein the first spray plate and the second spray plate are movable in a front-to-rear direction relative to each other.

34. The spray plate assembly of claim 30, wherein the first spray plate and the second spray plate are movable left-right relative to each other.

35. The spray plate assembly of claim 30, wherein the single cook setting comprises an impingement cook setting.

36. The spray plate assembly of claim 30, wherein the air flow has impingement heat transfer characteristics.

37. The spray plate assembly of claim 30, wherein the heat transfer coefficient h of the air flow is greater than about 41 W / m2·Kelvin.

38. The jet plate assembly of claim 30, wherein the mechanism comprises a Y-shaped member coupled to at least one of the first and second jet plates, wherein the at least one of the first and second jet plates moves in response to rotation of the Y-shaped member.

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