CA2590375A1 - Impingement/convection/microwave oven and method - Google Patents

Impingement/convection/microwave oven and method Download PDF

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Publication number
CA2590375A1
CA2590375A1 CA002590375A CA2590375A CA2590375A1 CA 2590375 A1 CA2590375 A1 CA 2590375A1 CA 002590375 A CA002590375 A CA 002590375A CA 2590375 A CA2590375 A CA 2590375A CA 2590375 A1 CA2590375 A1 CA 2590375A1
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Canada
Prior art keywords
oven
impingement
oven chamber
wall
microwave
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Granted
Application number
CA002590375A
Other languages
French (fr)
Other versions
CA2590375C (en
Inventor
Jan Claesson
Keith Stanger
Nigel Thorneywork
Andrew Brown
David Crayfound
David Harter
William Day
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Enodis Corp
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Individual
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Priority to CA2807937A priority Critical patent/CA2807937C/en
Priority to CA2807931A priority patent/CA2807931C/en
Publication of CA2590375A1 publication Critical patent/CA2590375A1/en
Application granted granted Critical
Publication of CA2590375C publication Critical patent/CA2590375C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B1/00—Bakers' ovens
    • A21B1/02—Bakers' ovens characterised by the heating arrangements
    • A21B1/24—Ovens heated by media flowing therethrough
    • A21B1/245—Ovens heated by media flowing therethrough with a plurality of air nozzles to obtain an impingement effect on the food
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6426—Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6473—Aspects related to microwave heating combined with other heating techniques combined with convection heating
    • H05B6/6476—Aspects related to microwave heating combined with other heating techniques combined with convection heating the refrigerating air being used for convection

Abstract

A combination oven that is operable with convection air, impingement air and microwave energy in various combinations thereof. The oven has an oven chamber and a fan box that are located front to back. A fan in the fan box circulates heated air by discharging via openings in a top and a bottom and taking in via an intermediate opening of a baffle plate. Impingement plates are easily installed and removed in the oven chamber to provide impingement air upwardly or downwardly. At least one of the impingement plates is installed and removed by a sliding motion. Microwave energy is provided through the side walls of the oven chamber. Intake ports for cooling air are located in a bevel between the side walls and bottom wall of the oven's outer enclosure so as to allow the oven to be located right next to other structures, such as a wall. An interlock assembly is also provided for the oven door.

Claims (102)

1. A combination oven comprising:
an oven chamber;
at least one impingement air generator disposed in said oven chamber to provide impingement air that flows substantially in a vertical direction within said oven chamber;
a microwave generator disposed to provide microwave energy into said oven chamber via at least one wall of said oven chamber; and a controller that operates said oven in wither a microwave mode, an impingement mode or a combination microwave and impingement mode.
2. The oven of claim 1, wherein said wall is vertical.
3. The oven of claim 1, wherein said wall is a back wall or a side wall.
4. The oven of claim 1, wherein said microwave generator provides said microwave energy via two walls of said oven chamber.
5. The oven of claim 1, wherein said impingement air generator comprises a removable plate, a blower and an air heater.
6. The oven of claim 3, wherein said wall is a side wall and wherein said oven further comprises a fan disposed in a fan box to circulate heated air between the fan box and said oven chamber via a baffle plate, said impingement air generator comprises a plate that converts a portion of the circulating air to said impingement air.
7. The oven of claim 6, wherein said plate is removable to convert said oven for operation in either a convection mode or a combination microwave and convection mode.
8. The oven of claim 6, wherein said plate is disposed near a bottom wall of said oven chamber so that said impingement air flows upwardly.
9. The oven of claim 6, wherein said plate is disposed near a top wall of said oven chamber so that said impingement air flows downwardly.
10. The oven of claim 8, wherein an additional plate is disposed near a top wall of said oven chamber so that another portion of said impingement air flows downwardly.
11. The oven of claim 6, wherein said microwave generator also provides microwave energy into said oven chamber via an opposite side wall of said oven chamber, and wherein said microwave facility comprises one or more microwave generators and one or more wave guides to provide said microwave energy.
12. The oven of claim 10, wherein said microwave generator also provides microwave energy into said oven chamber via an opposite side wall of said oven chamber, and wherein said microwave generator comprises one or more magnetrons and one or more wave guides to provide said microwave energy.
13. The oven of claim 6, wherein said plate has a handle to facilitate installation and removal by a sliding motion.
14. The oven of claim 6, wherein said plate comprises a front and opposed sides separated by a wall that contains an array of jet holes shaped to provide said impingement air.
15. The oven of claim 14, wherein said plate is installable in and removable from said oven chamber.
16. The oven of claim 15, wherein said plate further comprises a handle to facilitate installation and removal by a sliding motion.
17. The oven of claim 16, wherein said plate is installed substantially flush with said baffle plate to receive circulating air from said fan box, and wherein said plate comprises a diverter to provide a substantially uniform pressure to said jet holes, whether located near or remote from said baffle plate.
18. An oven for cooking food comprising:

an outer enclosure comprising at least a first side wall and an additional wall that is substantially perpendicular to said first side wall and connected to said first side wall by a portion that is inwardly offset from said first side wall;
an inner enclosure disposed within and spaced from said outer enclosure by a passageway; and a cooling fan that is disposed within said passageway and that is operable to maintain a flow of cooling air in said passageway between at least one intake port and one or more output ports, wherein said intake port is located in said offset portion of said outer enclosure.
19. The oven of claim 18, wherein said outer enclosure further comprises a second side wall, wherein said additional wall is inwardly offset from said second side wall by an additional offset portion, and wherein an additional intake port is located in said additional offset portion.
20. The oven of claim 19, wherein said offset portion comprises a first bevel between said additional wall and said first side wall, and wherein said additional offset portion comprises a second bevel between said additional wall and said second side wall.
21. The oven of claim 20, wherein said additional wall is a bottom wall.
22. The oven of claim 21, wherein said output port is located in a back wall of said outer enclosure.
23. The oven of claim 18, further comprising an air filter disposed at said intake port.
24. The oven of claim 18, further comprising a first air filter disposed in said intake port and a second air filter disposed at said second intake port.
25. The oven of claim 24, further comprising a first air filter holder and a second air filter holder that enables easy installation and removal of said first air filter and said second air filter, respectively.
26. The oven of claim 24, wherein said first air filter holder and said second air filter holder are configured for installation and removal by a sliding motion of the respective air filters.
27. The oven of claim 18, further comprising a source of cooking energy disposed to provide cook energy to said inner enclosure to cook food therein.
28. A method of operating an oven that includes an oven chamber, said method comprising:

providing impingement air that flows substantially vertically in said oven chamber;
providing microwave energy into said oven chamber via at least one wall of said oven chamber; and controlling said oven such that it operates in either a microwave mode, an impingement mode or a combination microwave and impingement mode.
29. The method of claim 28, wherein said wall is vertical.
30. The method of claim 28, wherein said wall is a back wall or a side wall.
31. The method of claim 28, wherein said microwave energy is provided by a microwave generator via two walls of said oven chamber.
32. The method of claim 28, further comprising installing in and removing from said oven chamber a removable impingement plate.
33. The method of claim 32, wherein said impingement plate is installable in and removable from said oven chamber with a sliding motion.
34. The method of claim 28, wherein said wall is a side wall and further comprising running a fan disposed in a fan box to circulate heated air between the fan box and said oven chamber via a baffle plate, and converting a portion of the circulating air to said impingement air.
35. The method of claim 28, wherein the converting step uses at least one impingement plate disposed in said oven chamber to convert the circulating air to impingement air.
36. The method of claim 35, wherein said impingement plate is removable to convert said oven for operation in a convection mode and a combination microwave and convection mode.
37. The method of claim 35, wherein said impingement plate is disposed near a bottom wall of said oven chamber so that said impingement air flows upwardly.
38. The method of claim 35, wherein said impingement plate is disposed near a top wall of said oven chamber so that said impingement air flows downwardly.
39. The method of claim 37, wherein an additional impingement plate is disposed near a top wall of said oven chamber so that another portion of said impingement air flows downwardly.
40. The method of claim 28, wherein said microwave energy is also provided into said oven chamber via an opposite side wall of said oven chamber.
41. The method of claim 39, wherein said microwave energy is also provided into said oven chamber via an opposite side wall of said oven chamber.
42. The method of claim 35, further comprising installing and removing said impingement plate with a sliding motion.
43. The method of claim 35, wherein said impingement plate comprises a frame that includes a front and opposed sides separated by a wall that contains an array of jet holes shaped to provide said impingement air.
44. The method of claim 35, wherein said impingement plate further comprises a handle to facilitate installation and removal by a sliding motion.
45. The method of claim 35, wherein said impingement plate is installed substantially flush with said baffle plate to receive circulating air from said fan box, and wherein said impingement plate comprises a diverter to provide a substantially uniform pressure to said jet holes, whether located near or remote from said baffle plate.
46 46. A method for cooking food comprising:

providing an outer enclosure comprising at least a first side wall and an additional wall that is substantially perpendicular to said first side wall and connected to said first side wall by a portion that is inwardly offset from said first side wall;
providing an inner enclosure disposed within and spaced from said outer enclosure by a passageway;
running a cooling fan that is disposed within said passageway to maintain a flow of cooling air in said passageway between at least one intake port and one or more output ports; and providing said intake port in said offset portion of said outer enclosure.
47. The method of claim 46, wherein said outer enclosure further comprises a second side wall, wherein said additional wall is inwardly offset from said second side wall by an additional offset portion, and wherein an additional intake port is located in said additional offset portion.
48. The method of claim 47, wherein said offset portion comprises a first bevel between said additional wall and said first side wall, and wherein said additional offset portion comprises a second bevel between said additional wall and said second side wall.
49. The method of claim 48, wherein said additional wall is a bottom wall.
50. The method of claim 49, wherein said output port is located in a back wall of said outer enclosure.
51. The method of claim 46, further comprising an air filter disposed at said intake port.
52. The method of claim 46, further comprising disposing a first air filter disposed at said intake port and a second air filter at said second intake port.
53. The method of claim 52, further comprising a first air filter holder and a second air filter holder that enables easy installation and removal of said first air filter and said second air filter, respectively.
54. The method of claim 52, wherein said first air filter holder and said second air filter holder are configured for installation and removal by a sliding motion of the respective air filters.
55. The method of claim 46, further comprising providing cook energy to said inner enclosure to cook food therein.
56. An oven comprising:

a frame, a door and a hinge that is connected with said door and said frame for rotating said door about a pivot as said door is opened and closed;
a cam that moves as said door rotates;
an interlock assembly that comprises first and second switches and that responds to the motion of said cam to activate said first and second switches in sequence as said door opens and closes.
57. The oven of claim 56, wherein said first and second switches are micro-switches.
58. The oven of claim 57, wherein said interlock assembly further comprises a plunger that is mounted for reciprocal motion and that activates said first and second micro-switches in response to said cam motion.
59. The oven of claim 58, wherein said plunger is shaped to control said sequence.
60. The oven of claim 59, wherein said first and second micro-switches comprise a first contact element and a second contact element, respectively, that are engaged by and tripped by the reciprocal motion of said plunger.
61. The oven of claim 60, wherein said plunger is shaped with first and second contours that are disposed in engagement with the first and second contact elements of the first and second micro-switches, respectively, wherein said first and second contours are shaped to activate the first and second micro-switches in sequence as said plunger is moved.
62. The oven of claim 61, wherein said interlock assembly further comprises a spring that compresses as said door closes and decompresses as said door opens to return said plunger to a door open position.
63. A controller for an oven that comprises at least one microwave generator, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to perform the steps of:
sampling an output of a temperature sensor located in the vicinity of said microwave generator for a current temperature of said microwave generator;
determining whether said current temperature is acceptable;
and if said current temperature is unacceptable, causing said oven to be disabled.
64. The controller of claim 63, wherein said microwave generator comprises at least one magnetron.
65. The controller of claim 63, wherein said oven is disabled automatically or manually by an operator as instructed by an error message notification generated by said processor.
66. The controller of claim 63, wherein said current temperature is unacceptable if it is greater than a predetermined overheat temperature.
67. The controller of claim 66, wherein said current temperature is also unacceptable if it is less than a predetermined cold temperature.
68. The controller of claim 63, wherein said current temperature is unacceptable when the current temperature fails a comparison test with a reference value a predetermined number of times.
69. A controller for an oven that comprises at least one microwave generator, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to run said microwave generator for N cooking stages and a remainder cooking stage at a predetermined duty cycle, where N is the total cooking time for a food product divided by a predetermined cooking stage period and the remainder is a remainder of said division.
70. The controller of claim 69, wherein said instructions cause said processor to perform the further steps of:
calculating N and the remainder; and calculating the on and off time of the microwave generator for the N cooking stages and the remainder cooking stage, based on the predetermined duty cycle.
71. A controller for an oven that comprises an oven chamber, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to control said oven for a cool down mode with steps comprising:
sampling an output of a temperature sensor located in said oven chamber for a current oven temperature;
determining if said current temperature is too hot;
if said current temperature is too hot, notifying an operator to place ice in said oven chamber;
repeating said sampling and determining steps until the oven chamber is determined to be cool; and notifying the user that the oven chamber is cool.
72. The controller of claim 71, wherein said instructions cause said processor to perform a further step of adjusting a speed of a cooling fan of said oven to a higher speed to assist in the cool down mode.
73. A controller for an oven that comprises a cooling fan, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to control said cooling fan with steps comprising:
sampling an output of a temperature sensor for a current temperature; and adjusting a speed of said cooling fan based on said current temperature.
74. The controller of claim 73, wherein a location of said temperature sensor is selected from the group consisting of: ambient, oven chamber and temperature sensitive components.
75. A controller for an oven, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to control an oven profile with steps comprising:
displaying to an operator a plurality of profile entry parameters;
modifying said profile entry parameters based on one or more inputs provided by said operator; and using said modified profile entry parameters to control the operation of said oven.
76. The controller of claim 75, wherein said profile entry parameters are selected from the group consisting of: language, alarm volume, alarm sound, manual mode, automatic mode and temperature units.
77. The controller of claim 75, wherein said profile entry parameters are sequentially displayed to said operator.
78. A controller for an oven, said controller comprising:
a processor and a memory containing a control program, wherein said control program comprises one or more instructions that cause said processor to control a transfer of data with a data carrying key with steps comprising:
detecting an input from a key reader that reads said key;
identifying from data carried by said key an operation of upgrade firmware, program download or program upload; and executing said identified operation.
79. The controller of claim 78, further comprising:
transferring the data of the identified operation;
doing a checksum of the transferred data;
validating the transferred data; and notifying an operator that the operation is completed.
80. A method of using a computer to control an oven that comprises at least one microwave generator, said method comprising:
sampling an output of a temperature sensor located in the vicinity of said microwave generator for a current temperature of said microwave generator;
determining whether said current temperature is acceptable; and if said current temperature is unacceptable, causing said oven to be disabled.
81. The method of claim 80, wherein said microwave generator comprises at least one magnetron.
82. The method of claim 80, wherein said oven is disabled automatically or manually by an operator as instructed by an error message notification generated by said processor.
83. The method of claim 80, wherein said current temperature is unacceptable if it is greater than a predetermined overheat temperature.
84. The method of claim 83, wherein said current temperature is also unacceptable if it is less than a predetermined cold temperature.
85. The method of claim 80, wherein said current temperature is unacceptable when the current temperature fails a comparison test with a reference value a predetermined number of times.
86. A method of using a computer to control an oven that comprises at least one microwave generator, said method comprising:
running said microwave generator for N cooking stages and a remainder cooking stage at a predetermined duty cycle, where N is the total cooking time for a food product divided by a predetermined cooking stage period and the remainder is a remainder of said division.
87. The method of claim 86, further comprising:
calculating N and the remainder; and calculating the on and off time of the microwave generator for the N cooking stages and the remainder cooking stage, based on the predetermined duty cycle.
88. A method for using a computer to control an oven that comprises an oven chamber, said method comprising:
sampling an output of a temperature sensor located in said oven chamber for a current oven temperature;
determining if said current temperature is too hot;
if said current temperature is too hot, notifying an operator to place ice in said oven chamber;
repeating said sampling and determining steps until the oven chamber is determined to be cool; and notifying the user that the oven chamber is cool.
89. The method of claim 88, further comprising: adjusting a speed of a cooling fan of said oven to a higher speed to assist in the cool down mode.
90. A method for using a computer to control an oven that comprises a cooling fan, said method comprising:
sampling an output of a temperature sensor for a current temperature; and adjusting a speed of said cooling fan based on said current temperature.
91. The method of claim 90, wherein a location of said temperature sensor is selected from the group consisting of: ambient, oven chamber and temperature sensitive components.
92. A method tor using a computer to control an oven, said method comprising:
displaying to an operator a plurality of profile entry parameters;
modifying said profile entry parameters based on one or more inputs provided by said operator; and using said modified profile entry parameters to control the operation of said oven.
93. The method of claim 92, wherein said profile entry parameters are selected from the group consisting of: language, alarm volume, alarm sound, manual mode, automatic mode and temperature units.
94. The method of claim 92, wherein said profile entry parameters are sequentially displayed to said operator.
95. A method for using a computer and a data carrying key to control an oven, said method comprising:
detecting an input from a key reader that reads said key;
identifying from data carried by said key an operation of upgrade firmware, program download or program upload; and executing said identified operation.
96. The method of claim 95, further comprising:
transferring the data of the identified operation;
doing a checksum of the transferred data;
validating the transferred data; and notifying an operator that the operation is completed.
97. A system for cooking a food product comprising:
an oven chamber;
an oven rack disposed in said oven chamber to hold a metal pan that contains the food product;

a microwave generator that provides microwave energy into said oven chamber via at least one vertical wall of said oven chamber to rapidly cook said food product; and an impingement air generator that provides impingement air substantially in a vertical direction in said oven chamber to brown said food product.
98. The system of claim 97, wherein said microwave generator includes a microwave source that provides said microwave energy into said oven via a feed aperture in said vertical wall, and wherein said food rack is located below said feed aperture so as to minimize microwave energy incident to said feed aperture that is reflected by said metal pan, thereby prolonging the longevity of said microwave source.
99. The system of claim 98, wherein said vertical wall is a side wall of said oven chamber.
100. The system of claim 99, wherein said microwave generator also provides said microwave energy into said oven chamber via an opposite side wall.
101. The system of claim 97, wherein said impingement air generator comprises a plate that is manually installable and removable so as to convert the system back and forth between a combination of impingement and microwave and a combination of convection and microwave.
102. The system of claim 97, further comprising a controller and a cooling fan that cools the microwave generator, wherein said controller regulates a speed of said cooling fan based on a temperature sensed by a probe in a vicinity of the microwave facility to reduce the speed as the sensed temperature falls and to increase the speed as the sensed temperature rises.
CA2590375A 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method Expired - Fee Related CA2590375C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA2807937A CA2807937C (en) 2004-12-14 2005-12-14 Double enclosure impingement/convection/microwave oven and method
CA2807931A CA2807931C (en) 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US63585704P 2004-12-14 2004-12-14
US60/635,857 2004-12-14
US68259405P 2005-05-19 2005-05-19
US60/682,594 2005-05-19
US73524105P 2005-11-09 2005-11-09
US60/735,241 2005-11-09
PCT/US2005/045049 WO2006065807A2 (en) 2004-12-14 2005-12-14 Impingement/ convection/ microwave oven and method

Related Child Applications (2)

Application Number Title Priority Date Filing Date
CA2807931A Division CA2807931C (en) 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method
CA2807937A Division CA2807937C (en) 2004-12-14 2005-12-14 Double enclosure impingement/convection/microwave oven and method

Publications (2)

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CA2590375A1 true CA2590375A1 (en) 2006-06-22
CA2590375C CA2590375C (en) 2013-04-30

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CA2807931A Expired - Fee Related CA2807931C (en) 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method
CA2590375A Expired - Fee Related CA2590375C (en) 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method

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CA2807931A Expired - Fee Related CA2807931C (en) 2004-12-14 2005-12-14 Impingement/convection/microwave oven and method

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US (6) US8071922B2 (en)
EP (3) EP2408263B1 (en)
JP (1) JP2008523352A (en)
KR (1) KR20070116784A (en)
CN (5) CN101496447B (en)
AT (1) ATE536078T1 (en)
AU (1) AU2005316586B2 (en)
CA (3) CA2807937C (en)
ES (1) ES2378458T3 (en)
HK (3) HK1150148A1 (en)
MX (1) MX2007007104A (en)
NZ (2) NZ586502A (en)
PL (1) PL1825715T3 (en)
SG (1) SG184719A1 (en)
TW (1) TWI365043B (en)
WO (1) WO2006065807A2 (en)

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