WO2010024273A1

WO2010024273A1 - Cooking device

Info

Publication number: WO2010024273A1
Application number: PCT/JP2009/064830
Authority: WO
Inventors: 安昭坂根; 隆男村井; 正浩西島
Original assignee: シャープ株式会社
Priority date: 2008-08-29
Filing date: 2009-08-26
Publication date: 2010-03-04
Also published as: CN102132102B; EP2322859A1; CN102132102A; JP4439575B2; MY152407A; US20110132346A1; JP2010054178A

Abstract

A cooking device (1) comprises an exhaust dilution device (70), which dilutes the exhaust from a heating chamber (20). The exhaust dilution device (70) includes a discharge duct (72), which discharges air sent from a dilution fan (71) through a discharge outlet (72a) via a first ejector (74), a dilution duct (73), one end of which is connected to a suction intake (72c) disposed in the discharge duct (72) at a position where the first ejector (74) provides suction effect, and the other end of which constitutes air intake (73a), and an exhaust duct (24), one end of which is connected to an exhaust vent (25) disposed in the side wall of the heating chamber (20), and the other end of which is connected at a position between the suction intake (72c) and the air intake (73a) in the dilution duct (73) via a second ejector (75).

Description

Cooker

The present invention relates to an oven-type cooking device that heats ingredients inside a heating chamber.

An oven-type cooking device that heats ingredients placed in a heating chamber by high frequency, electric heat, hot air, steam, etc. is indispensable for daily life. Some types of this type of cooking device are provided with a mechanism for forcibly exhausting oily smoke and water vapor generated from foods with heating, or water vapor used for heating foods. An example of this can be seen in US Pat.

The exhaust from the heating chamber is not only hot, but also contains a large amount of water vapor and smoke. For this reason, when walls, furniture, other electrical devices, etc. are approaching just above or to the side of the exhaust port, they may become wet or dirty with oily smoke. In order to cope with this problem, in the heating cooker described in Patent Document 1, the temperature is lowered by mixing and diluting the exhaust gas with the outside air, and the factors that give wetness and dirt are reduced before exhausting.

JP 2008-116094 A

The exhaust gas dilution device of the heating cooker described in Patent Document 1 has a complicated configuration including a damper in the exhaust system. An object of the present invention is to make it easy to incorporate an exhaust dilution device for a heating cooker into an existing design cooking cooker with a relatively simple configuration that does not use a damper. It is another object of the present invention to provide an exhaust dilution device that can continue exhaust even if the air outlet is blocked due to some accident.

In order to achieve the above object, the present invention is a heating cooker comprising a heating chamber for heating food, the heating chamber having an exhaust port, and the exhaust port is provided with an exhaust dilution device, The exhaust dilution device is provided at a position where the air outside the heating chamber sent from the dilution fan is blown out from the blowout port via the first ejector, and the first ejector has a suction effect in the blowout duct. One end is connected to the suction port and the other end is connected to the dilution duct which is an intake port and the exhaust port provided on the side wall of the heating chamber, and the other end is connected to the suction duct in the dilution duct. And an exhaust duct connected via a second ejector at a position between the inlet and the inlet.

According to this configuration, it is possible to realize a system that sucks exhaust gas from the heating chamber, dilutes it with outside air, and discharges it without using a damper. Since the basic elements are only the dilution fan, the duct group, and the ejector provided in the duct, the configuration is simple and easy to manufacture, and it can be easily incorporated into a heating cooker of an existing design.

In the cooking device configured as described above, the nozzle part of the second ejector is spaced apart from each other and is substantially parallel to the suction port side wind guide plate and the suction port side wind guide plate protruding from the exhaust duct into the dilution duct. It is preferable that the suction port side wind guide plate has a larger amount of protrusion into the dilution duct than the intake port side wind guide plate.

According to this configuration, when the outlet of the outlet duct is blocked due to some accident, the airflow from the dilution fan flows into the dilution duct from the suction port and tries to exit from the intake port. For this reason, in the dilution duct, an air flow from the suction port to the intake port is generated in the opposite direction, but the air flow is prevented from entering the exhaust duct through the second ejector by the suction port side air guide plate. The gas is sucked out of the exhaust duct due to a decrease in static pressure due to the airflow. Therefore, the exhaust from the exhaust duct is continued as it is.

In the heating cooker configured as described above, it is preferable that the nozzle portion of the second ejector is inclined toward the suction port from the communicating portion with the exhaust duct.

According to this configuration, the exhaust gas discharged from the exhaust duct through the second ejector flows toward the suction port, and smoothly flows into the flow of outside air in the dilution duct and flows into the blowout duct.

According to the present invention, the exhaust gas dilution device of the heating cooker can be easily configured and easily manufactured, and can be easily incorporated into the existing cooking cooker. Further, even if the air outlet is blocked due to some accident, the exhaust can be continued.

It is the schematic sectional drawing which looked at the cooking-by-heating machine concerning one embodiment of the present invention from the side. FIG. 2 is a schematic cross-sectional view similar to FIG. It is the schematic sectional drawing which looked at the cooking-by-heating machine from the front. FIG. 4 is a schematic cross-sectional view similar to FIG. 3 with the cross-sectional position being shifted. It is the schematic sectional drawing which looked at the heating cooker from the top. It is an expanded sectional view of a steam generator. It is an expanded sectional view of a dilution duct and an exhaust duct. It is an expanded sectional view of the dilution duct and exhaust duct which show the operation state different from FIG. It is a block block diagram of a heating cooker.

Embodiments of the present invention will be described below with reference to the drawings. The cooking device 1 includes a rectangular parallelepiped cabinet 10. A rectangular parallelepiped heating chamber 20 is also provided inside the cabinet 10. The heating chamber 20 has an opening on the front side of the cabinet 10. A door 11 that opens and closes the opening of the heating chamber 20 is provided in front of the cabinet 10. The door 11 pivots in the vertical plane with the lower part as a fulcrum, and by holding the upper handle 12 and pulling it forward, the door 11 is in a 90 ° posture from the vertical fully closed position shown in FIG. 1 to the horizontal fully open position. Can be converted. The door 11 is provided with high-frequency leakage prevention measures and a gasket for preventing vapor leakage, but these are well-known techniques and will not be described.

Steam generated from ingredients during cooking or steam used for cooking may condense on the inner surface of the door 11. A dew tray 13 is disposed under the door 11 so that the condensed water does not drip and wet the installation location of the heating cooker 1.

The heating chamber 20 is provided with an air supply duct 21 outside the right side wall (hereinafter referred to as “right side wall”) as viewed from the front. The air supply duct 21 extends in the horizontal direction, and an air supply fan 22 that takes in air inside the cabinet 10 is disposed at one end thereof. The air supply fan 22 is a propeller fan (axial fan). The other end of the air supply duct 21 is connected to an air supply port 23 that sends air into the heating chamber 20. The air supply port 23 is composed of a set of a plurality of small holes formed in the right side wall of the heating chamber 20.

The heating chamber 20 is provided with an exhaust duct 24 on the right side wall. One end of the exhaust duct 24 is connected to an exhaust port 25 for discharging air from the inside of the heating chamber 20. The exhaust duct 24 is a part of an exhaust dilution device described later. The exhaust port 25 is formed by a set of a plurality of small holes formed in the right side wall of the heating chamber 20.

The exhaust duct 24 rises vertically from the connection point to the exhaust port 25. Inside the exhaust duct 24, a humidity sensor 26 is disposed at a position where air is received from the exhaust port 25. On the other hand, a temperature sensor 27 made of a thermistor is disposed on the ceiling of the heating chamber 20.

The food F is supported in the heating chamber 20 by a food support net 30 having legs on the periphery and a food tray 31 on which the food support net 30 is placed. Inside the heating chamber 20, a tray receiver that supports the inserted food tray 31 at a predetermined height is provided. In the present embodiment, tray receivers are formed on both side walls of the heating chamber 20 to engage the left and right sides of the food tray 31 and support them horizontally.

As shown in FIG. 3, the tray receiver is provided in two upper and lower stages. What constitutes the upper tray receiver 32 and the lower tray receiver 33 are ridge-shaped protrusions protruding from the side walls of the heating chamber 20.

The heating cooker 1 can be heated by high frequency, heated by hot air, heated by water vapor, and heated by mixing them. Then, the structure of each heating means is demonstrated.

In the space between the bottom of the heating chamber 20 and the bottom of the cabinet 10, a magnetron 40 and a waveguide 41 that supplies the high frequency generated by the magnetron 40 to the heating chamber 20 are disposed. The waveguide 41 is connected to an antenna housing cavity 42 that extends below the bottom of the heating chamber 20. The antenna housing cavity 42 is separated from the heating chamber 20 by a partition plate 43 made of a dielectric material such as glass or ceramic. The partition plate 43 is a bottom plate for the heating chamber 20 and a ceiling plate for the antenna storage cavity 42.

The antenna housing cavity 42 is provided with an antenna 44 having a receiving antenna section and a radiating antenna section. The antenna 44 is attached to the upper end of the shaft of the antenna motor 45, and is continuously rotated or oscillated (periodically reversed) by controlling the rotation of the antenna motor 45 to control the high frequency distribution in the heating chamber 20.

In the space between the bottom of the heating chamber 20 and the bottom of the cabinet 10, an electrical component housing 46 is provided, and a high frequency drive power supply 47 (see FIG. 9) is mounted on the control board therein. Since the high-frequency drive power supply 47 and the magnetron 40 are heat-generating components during high-frequency heating, that is, components that generate considerable heat during high-frequency oscillation, a cooling fan 48 that forcibly cools them is installed on the bottom of the cabinet 10. The cooling fan 48 includes a fan casing 48a, a saddle shaft cooling fan motor 48b, and a sirocco fan 48c fixed to the upper end of the shaft of the cooling fan motor 48b. When the cooling fan motor 48b is driven to rotate the sirocco fan 48c, external air is sucked from an intake port 49 (also formed of a plurality of small holes) formed in the bottom of the cabinet 10, and the air is It is discharged from the discharge port of the fan casing 48a in a horizontal direction and air-cools the heat-generating component during high-frequency heating.

Heating with hot air is realized by a convection heater unit 50 provided outside the inner wall of the heating chamber 20. The convection heater unit 50 is composed of a dish-shaped heat insulating fan casing 51 fixed to the outer surface of the back wall of the heating chamber 20, and a space surrounded by the heat insulating fan casing 51 and the back wall of the heating chamber 20. They are a convection fan 52 that is arranged, a convection motor 53 that rotates the convection fan 52, and an annular convection heater 54 that surrounds the outer periphery of the convection fan 52.

The convection fan 52 is a centrifugal fan, and sucks air inside the heating chamber 20 from an intake port 55 formed in the center of the inner wall of the heating chamber 20 and discharges the air in the outer peripheral direction. It is made to blow out to the heating chamber 20 from the jet port 56 formed in the total of six places of the wall of the back of the heating chamber 20 in the surrounding form. If the convection heater 54 is energized, the air discharged from the convection fan 52 is heated, and hot air is blown out from the air outlet 56. Note that both the air inlet 55 and the air outlet 56 are composed of a plurality of small holes.

It is the steam generator 60 installed outside the right side wall of the heating chamber 20 that realizes heating with water vapor. The steam generator 60 can generate saturated steam or superheated steam, and the structure thereof will be described below mainly with reference to FIG.

The steam generator 60 has a housing 61 that is flat in the left-right direction when viewed from the front. Inside the housing 61, a steam generating heater 62 is provided in the lower part, and a steam temperature raising heater 63 is provided in the upper part. The steam generating heater 62 and the steam heating heater 63 are both sheathed heaters, and when viewed from the right side, that is, from the viewpoint of FIGS. 1 and 2, the steam generating heater 62 has a horseshoe shape, Draw an oval loop. The oval loop of the steam heating heater 63 is a continuous double loop that overlaps in the depth direction of the drawing in FIG.

The housing 61 is formed by combining a main body 61a, which is a die-cast product, and a lid 61b. A steam generating heater 62 is cast into the main body 61a. Of the wall surface of the main body 61 a, the portion where the steam generating heater 62 is cast is retracted toward the lid 61 b, and a space is formed between the right side wall of the heating chamber 20. For this reason, the heat generated by the steam generating heater 62 is not easily transmitted to the right side wall of the heating chamber 20, and is effectively used for steam generation, which is the original purpose.

The steam temperature raising heater 63 is surrounded by a box-shaped partition member 64 whose upper surface is open inside the housing 61. The partition member 64 is made of metal or ceramic having higher heat resistance than the housing 61. A black heat resistant paint is applied to the inner surface of the partition member 64. This is because the radiant heat of the steam temperature raising heater 63 is absorbed by the partition member 64 as much as possible, and the temperature rise of the housing 61 is suppressed.

A water supply port 65 is formed in the lid 61 b of the housing 61 at a level slightly higher than the steam generating heater 62. A water supply pipe 66 a of a water supply pump 66 (see FIGS. 3 and 5) is connected to the water supply port 65. A water absorption pipe 66 b of the water supply pump 66 is connected to the bottom of the water supply tank 67. The water supply pump 66 and the water supply tank 67 are arranged in a space between the right side wall of the cabinet 10 and the right side wall of the heating chamber 20, and the water supply tank 67 can be taken in and out from the front side of the cabinet 10.

On the side wall of the main body 61 a of the housing 61, a horizontal steam outlet 68 that protrudes into and out of the housing 61 is formed at a position slightly higher than the water supply port 65. One end of the steam outlet 68 protrudes into the partition member 64 through a through hole formed in the partition member 64, and the other end of the steam outlet 68 is heated through a through hole formed in the right side wall of the heating chamber 20. Head out inside 20. When the partition member 64 is made of metal, the black heat resistant coating described above is useful for preventing electrolytic corrosion due to contact between different metals between the partition member 64 and the housing 61. A total of four steam outlets 68 are formed in a line from the front side to the back side of the cabinet 10 and jet saturated water vapor or superheated steam into the gap between the food support net 30 and the food tray 31.

The exhaust dilution device 70 is installed outside the right side wall of the heating chamber. The main components of the exhaust dilution device 70 are the exhaust duct 24, the dilution fan 71, the blowout duct 72, the dilution duct 73, the first ejector 74 formed inside the blowout duct 71, and the exhaust duct 24 and the dilution duct 73. It is the 2nd ejector 75 formed between these.

The dilution fan 71 includes a casing 71a, a sirocco fan 71b disposed in the casing 71a, and a dilution fan motor 71c (see FIG. 9) that rotates the sirocco fan 71b. A blower duct 71 d extends horizontally from the casing 71 a and enters the blowout duct 72. The end of the air duct 71d bends upward at a right angle and becomes the nozzle portion 74a of the first ejector 74.

The upper end of the blowout duct 72 protrudes above the top surface of the cabinet 10. The blower outlet 72a which faces the diagonally upward front direction of the heating cooker 1 is formed in this part. The blower outlet 72a is provided with a louver 72b that directs the airflow in a predetermined direction. A part of the blowout duct 72 is constricted, and the constricted portion is a throat portion 74b that constitutes the first ejector 74 together with the nozzle portion 74a.

The suction duct 72 is formed with a suction port 72c in a portion below the first ejector 74. This is where the first ejector 74 provides a suction effect. The suction port 72 c communicates with the dilution duct 73.

A drain tube 72d is connected to the bottom of the blowout duct 72. Water vapor contained in the exhaust is condensed on the inner surface of the blowout duct 72. Moreover, water may enter the outlet duct 72 from the outlet 72a. The drainage tube 72d is for draining these waters to a drainage channel or drainage tank (not shown).

The dilution duct 73 exists behind the blowout duct 72 from the viewpoint of FIG. 1 and extends horizontally, with one end closed and the other end open. The closed end is connected to the suction port 72 c of the blowout duct 72. The open end is exposed to the outside of the cabinet 10, and the opening is used as an air inlet 73a.

The exhaust duct 24 is connected to the lower surface of the dilution duct 73. A second ejector 75 is formed on the boundary wall between the exhaust duct 24 and the dilution duct 73. The second ejector 75 is formed at a position in the dilution duct 73 between the suction port 72c and the intake port 73a.

As shown in FIG. 7, the nozzle portion 75a of the second ejector 75 has a suction port side air guide plate 75b and an intake port side air guide that project from the exhaust duct 24 into the dilution duct 73 in parallel with each other at an interval. Including a plate 74c. The suction port side air guide plate 75b has a larger amount of protrusion into the dilution duct 73 than the intake port side air guide plate 75c, and there is a difference h between the two projecting amounts. The nozzle portion 75a is inclined from the communicating portion with the exhaust duct 24 toward the suction port 72c.

The control elements of the heating cooker 1 are shown in FIG. The control device 80 is responsible for overall control. The control device 80 includes an air supply fan 22, an antenna motor 45, a high frequency power supply 47, a cooling fan motor 48 b, a convection motor 53, a convection heater 54, a steam generation heater 62, a steam temperature raising heater 63, a feed water pump 66, and a dilution fan. In addition to the above-described elements such as the motor 71c, the humidity sensor 26, and the temperature sensor 27, the operation unit 14, the display unit 15, the water level sensor 60a, the tank water level sensor 67a, and the door opening / closing sensor 11a are connected. The operation unit 14 is provided on the surface of the door 11 and includes operation means such as a push button and a dial. The display unit 15 is also provided on the surface of the door 11 and includes display means such as a liquid crystal display panel. The water level sensor 60a is provided in the steam generator 60 and measures the water level inside it, and the tank water level sensor 67a is provided in the water supply tank 67 and measures the water level inside it. The door opening / closing sensor 11a is provided for the door 11, and determines whether the door 11 is open or closed.

When heating by high frequency, the high frequency drive power supply 47, the air supply fan 22, the cooling fan 48, and the dilution fan 71 are turned on. Then, the magnetron 40 oscillates to generate a high frequency, and the generated high frequency enters the antenna housing cavity 42 through the waveguide 41. The high frequency that has entered the antenna housing cavity 42 is received by the receiving antenna portion of the antenna 44 and then radiated from the radiating antenna portion to the heating chamber 20 through the partition plate 43. And the foodstuff F in the heating chamber 20 is heated. When the air supply fan 22 supplies fresh air to the heating chamber 20, the air in the heating chamber 20 containing water vapor generated from the food F is pushed out from the exhaust port 25 to the exhaust duct 24, and the action of the dilution fan 71. After being diluted, the air is sucked into the blowout duct 72 and discharged from the blowout port 72a.

When heating with hot air is performed, the convection motor 53 and the convection heater 54 are turned on with the air supply fan 22 turned off and the dilution fan 71 turned on. A convection fan 52 rotated by a convection motor 53 sucks air inside the heating chamber 20 from the air supply port 55 and discharges it in the outer circumferential direction. The air discharged from the convection fan 52 is heated by the convection heater 54 to become hot air, and is blown out into the heating chamber 20 from the blowing port 56 to heat the food F in the heating chamber 20. Also in this case, by the operation of the dilution fan 71, oily smoke, odor, water vapor and the like generated from the food material F are sucked into the exhaust duct 24 from the exhaust port 25, diluted, and then discharged out of the machine from the blowout port 72a.

When heating with water vapor, the water supply fan 22 is turned off and the dilution fan 71 is turned on, water is poured into the housing 61 of the steam generator 60 to a predetermined water level, and the heater is turned on. When only the steam generating heater 62 is turned ON, the generated water vapor passes through the gap between the inner surface of the housing 61 and the partition member 64 and enters the partition member 64, and is ejected from the steam ejection port 68 to the heating chamber 20. At this time, it is saturated water vapor.

When the steam temperature raising heater 63 is also turned on, the saturated steam that has entered the partition member 64 is heated, and becomes superheated steam, which is jetted into the heating chamber 20.

When saturated steam or superheated steam is injected into the heating chamber 20, excess steam in the heating chamber 20 is discharged from the exhaust port 25 to the exhaust duct 24. This water vapor is diluted by the action of the dilution fan 71, becomes safe at a lower temperature, and further, after the relative humidity is lowered and it becomes difficult to condense on the surrounding wall, it is discharged out of the machine as exhaust from the blower outlet 72a.

HF heating, hot air heating, and steam heating can be performed independently, or two or three of them can be performed simultaneously. When the air in the heating chamber 20 is forcibly replaced, such as during cooling, the air supply fan 22 and the dilution fan 71 are operated.

When the dilution fan 71 is operated, the air in the cabinet 10 sucked into it is jetted upward from the nozzle portion 74a and passes through the first ejector 74 at high speed. This high-speed air flow reduces the static pressure and heads toward the outlet 72a while entraining the surrounding air. Therefore, a suction effect is generated in the portion below the first ejector 74 of the outlet duct 72, and the entrained air is The supplementary air is sucked from the dilution duct 73 through the suction port 72c.

A large amount of outside air is sucked into the dilution duct 73 through the suction port 73a by the suction force generated at the suction port 72c. Further, as shown in FIG. 7, the gas in the exhaust duct 24 is sucked out to the dilution duct 73 through the second ejector 75 by a part of the suction force generated at the suction port 72 c. This gas is mixed with the outside air sucked from the intake port 73a and diluted. For this reason, even if the gas in the exhaust duct 24 is high in temperature and contains a lot of water vapor or oily smoke, it is diluted with the outside air, and the factors that give wetness and dirt to the surroundings are reduced from the outlet 72a. It will be discharged outside the machine.

When the nozzle portion 75a of the second ejector 75 is inclined toward the suction port 72c from the communicating portion with the exhaust duct 24, when the air supply fan 22 is ON, the air is discharged from the exhaust duct 24 through the second ejector 75. The exhaust gas flows toward the suction port 72c and smoothly flows into the flow of outside air in the dilution duct 73 and flows into the blowout duct 72.

If the blowout port 72a is blocked due to some accident, the air blown from the nozzle portion 74a by the dilution fan 71 loses its place and is blown out from the suction port 72c to the dilution duct 73. Therefore, in the dilution duct 73, as shown in FIG. 8, an airflow that is opposite to normal is generated from the suction port 72c to the air intake port 73a, and the airflow is discharged from the air intake port 73a.

The airflow from the suction port 72 c toward the suction port 73 a does not enter the second ejector 75 because the suction port side air guide plate 75 b protrudes into the dilution duct 73. Since the protrusion of the air inlet side air guide plate 75c is smaller than the air inlet side air guide plate 75b by h, the second ejector 75 has a suction effect due to a decrease in static pressure due to the air flow from the air inlet 72c to the air inlet 73a. As a result, the gas in the exhaust duct 24 is sucked out. As a result, the exhaust through the exhaust duct 24 is continued as it is, so that the air from the dilution fan 71 does not flow backward from the exhaust port 25 into the heating chamber 20. For this reason, there is no risk that water vapor or smoke in the heating chamber 20 leaks into the space in the cabinet 10 where the electrical component housing 46 and the magnetron 40 exist through the air supply port 23, the sheet metal joint, and the like.

The embodiment of the present invention has been described above, but the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention.

The present invention can be widely used in an oven-type cooking device that heats ingredients inside a heating chamber.

DESCRIPTION OF SYMBOLS 1 Heating cooker 10 Cabinet 20 Heating chamber 24 Exhaust duct 25 Exhaust opening 30 Food support net 31 Food tray F Food 40 Magnetron 47 High frequency drive power supply 48 Cooling fan 50 Convection heater unit 60 Steam generator 70 Exhaust dilution device 71 Dilution fan 72 Blowout Duct

72a Air outlet

72c Suction port 73 Dilution duct 73a Air inlet 74 First ejector 75 Second ejector 75a Nozzle part 75b Suction port side air guide plate 74c Inlet port side air guide plate 80 Control device

Claims

A cooking device characterized by the following:
A heating chamber for heating the food, the heating chamber has an exhaust port, and the exhaust port is provided with an exhaust dilution device;
The exhaust dilution device includes:
A blowout duct for blowing out air from the heating chamber sent from the dilution fan from the blowout port via the first ejector;
A dilution duct in which one end is connected to a suction port provided at a position where the first ejector provides a suction effect in the blowout duct, and the other end is an intake port;
One end is connected to an exhaust port provided on the side wall of the heating chamber, and the other end is connected to a position between the suction port and the intake port in the dilution duct via a second ejector,
including.
A cooking device according to claim 1, characterized by:
The nozzle portion of the second ejector includes a suction port side wind guide plate and an intake port side wind guide plate that are spaced apart from each other and project substantially in parallel from the exhaust duct into the dilution duct. The air plate has a larger amount of protrusion into the dilution duct than the air inlet side air guide plate.
A cooking device according to claim 2, characterized by:
The nozzle part of the second ejector is inclined toward the suction port from the communication part with the exhaust duct.