JP5548012B2 - Cooker - Google Patents

Description

  The present invention relates to a cooking device that performs cooking by circulating gas in a heating chamber.

  There is a type of oven-type cooking device that circulates gas in a heating chamber. An example of such a heating cooker can be seen in US Pat.

  The heating cooker described in Patent Document 1 performs heating by supplying at least one of high frequency and steam to the heating chamber. Further, a circulation fan chamber is provided behind the heating chamber, and the circulation fan and the convection heater disposed therein circulate while heating the air in the heating chamber.

JP 2005-114350 A

  In the case of an oven-type heating cooker that is configured to cook by heating the gas in the heating chamber, on-off control is usually employed for controlling the heater that heats the gas. An object of the present invention is to reduce power consumption in a heating cooker that controls a gas heater by on-off control.

According to a preferred embodiment of the present invention, the cooking device comprises a circulation fan that circulates the gas in the heating chamber, a gas heater that heats the gas that the circulation fan circulates, and a temperature that detects the temperature in the heating chamber. And a control device that performs overall control, and the control device turns off the gas heater when the temperature detection device detects that the temperature in the heating chamber has risen to a first predetermined value. When the temperature detecting device detects that the temperature in the heating chamber has dropped to a second predetermined value, the gas heater is returned to the on state. is the with circulating fans performs control to return to the normal air volume, the control device, after returning to the oN state the gas heater from the oFF state Further performs control to return the circulating fan to the normal air blowing amount after the predetermined time has elapsed.

  According to a preferred embodiment of the present invention, in the cooking device configured as described above, after the control device returns the gas heater from the off state to the on state, the temperature in the heating chamber has increased to a predetermined temperature. Waiting for the temperature detection device to detect this, control is performed to return the circulation fan to the normal air flow rate.

  According to a preferred embodiment of the present invention, in the cooking device having the above-described configuration, the value of the degree of decrease is variable with respect to a decrease in the air flow rate of the circulation fan when the gas heater is turned off.

  According to a preferred embodiment of the present invention, in the cooking device configured as described above, the circulation fan and the gas heater are provided for a circulation duct provided outside the heating chamber.

  According to a preferred embodiment of the present invention, in the cooking device configured as described above, the temperature detection device is disposed at an inlet portion of the circulation duct.

According to the present invention, when the temperature detection device detects that the temperature in the heating chamber has risen to the first predetermined value, the gas heating heater is turned off, and the residual heat of the gas heating heater causes the temperature in the heating chamber. Will be maintained. Here, if the circulation fan is blowing air as usual, the gas heater is cooled immediately, the temperature of the heating chamber is also lowered, and early energization must be resumed. Since the air flow rate of the circulation fan also decreases during the off state, the gas heater is not easily cooled, and the energization resumption timing can be extended. Thereby, coupled with the fact that the power consumption of the circulation fan itself is reduced due to the decrease in the air flow rate, the power consumption of the heating cooker can be reduced. Further, the control device performs control to return the circulation fan to the normal air flow rate after a predetermined time has elapsed after returning the gas heater from the OFF state to the ON state, so that the temperature of the gas heater is sufficiently increased. However, it is possible to avoid a situation where the circulation fan is returned to the normal air flow rate and the circulation fan is wasted power .

It is a perspective view which shows the heating cooker which concerns on embodiment of this invention. It is a vertical sectional view showing the outline of the internal structure of the cooking device according to the embodiment of the present invention. It is a block block diagram of the heating cooker which concerns on embodiment of this invention. It is explanatory drawing which shows the relationship between control of a gas heating heater and a circulation fan, and a heating chamber temperature.

  Hereinafter, the structure of the heating cooker 1 which is embodiment of this invention is demonstrated based on figures. In FIG. 1, the upper and lower sides of the paper coincide with the upper and lower sides of the heating cooker 1. Further, the left side of the paper surface is the left side of the heating cooker 1, and the right side of the paper surface is the right side of the heating cooker 1.

  The heating cooker 1 has an opening 2d on the front surface of a casing made of a rectangular parallelepiped sheet metal structure, and the back of the opening 2d is a heating chamber 2 for storing a cooked product. The opening 2d is closed by a door 3 that rotates with the lower end as a fulcrum. The door 3 is filled with a heat insulating material, and a see-through window 4 for visually confirming the state inside the heating chamber 2 is provided at the center thereof. The see-through window 4 is fitted with heat-resistant glass. An operation unit 5 for performing an input operation is provided on the right side of the heating chamber 2 in the casing.

  The internal structure of the heating cooker 1 is shown in FIG. A steam supply unit 10 is attached to the lower part of the right side wall of the heating chamber 2. The steam supply unit 10 is obtained by embedding a steam generating heater 13 made of a sheathed heater in a metal container having a water supply port 11 and a discharge port 12. The water supply port 11 receives supply of water for generating steam from a water supply tank (not shown) detachably attached to the heating cooker 1. The steam generation heater 13 evaporates water inside the steam supply unit 10 to generate steam. The generated steam is discharged from the discharge port 12. The discharge port 12 opens to the inside of the circulation duct 20 and discharges steam to the upstream side of the circulation fan 21.

  In the heating chamber 2, the food is placed on the tray 7. On the left and right side walls of the heating chamber 2, a plurality of installation portions 6 for receiving the left and right side edges of the tray 7 are formed at intervals in the height direction. Accordingly, one tray 7 can be installed at different height positions, or a plurality of trays 7 can be installed over a plurality of stages. Note that an opening through which airflow can pass is provided in the handle portion around the tray 7.

  A suction port 2a is opened in the upper part of the right side wall of the heating chamber 2, a blowout port 2b is opened in the left side wall, and a blowout port 2c is opened in the ceiling wall. The suction port 2a is disposed above the uppermost part of the installation unit 6. The blower outlet 2b is opened over a wide range from the upper part of the uppermost installation part 6 to the lower part of the lowermost installation part 6. You may divide and form the blower outlet 2b for every step of the installation part 6. FIG. The blower outlet 2c is comprised by many small holes.

  The inlet 2 a and the outlet 2 b are connected by a circulation duct 20 disposed outside the heating chamber 2. The circulation duct 20 has a gate-like shape, and the right side is a first side surface portion 20a, the left side is a second side surface portion 20b, and the middle is a top surface portion 20c. The 1st side part 20a is connected to the suction inlet 2a, the 2nd side part 20b is connected to the blower outlet 2b, and the top | upper surface part 20c is connected to the blower outlet 2c. Inside the second side surface portion 20b, a protrusion 24 is formed that protrudes toward the heating chamber 2 from the inner wall facing the air outlet 2b.

  A circulation fan 21 and a gas heater 22 are provided for the circulation duct 20. The circulation fan 21 is constituted by a centrifugal fan, and sucks the gas in the heating chamber 2 from the suction port 2 a and discharges it into the circulation duct 20. The gas sent from the circulation fan 21 to the circulation duct 20 flows through the inside of the circulation duct 20 and is blown into the heating chamber 2 from the blowout ports 2b and 2c. In this way, the gas in the heating chamber 2 circulates via the circulation duct 20.

  The gas heater 22 is a sheathed heater, and is disposed inside the top surface portion 20 c of the circulation duct 20 to heat the gas flowing through the circulation duct 20. When the gas flowing through the circulation duct 20 is steam, the steam can be heated to a predetermined temperature, and cooking can be performed with saturated steam or superheated steam that is in the steam state at that temperature. The gas heater 22 not only heats the gas but also emits radiant heat into the heating chamber 2 through the ceiling wall of the heating chamber 2, and the radiant heat is also used for cooking. The gas heater 22 may be an IH heater, the circulation duct 20 itself or a metal member disposed therein may be induction-heated to heat the gas with the heat and to release radiant heat.

  The control system of the heating cooker 1 has a configuration shown in FIG. A control device 30 that controls the entire cooking device 1 is configured with a microcomputer as a core, receives output signals from various components, and outputs control signals to various components.

  The components that output signals to the control device 30 include the following. That is, the operation unit 5, the humidity detection device 31 that measures the humidity of the heating chamber 2, the temperature detection device 32 that measures the temperature of the heating chamber 2, the water level detection device 33 that measures the water level inside the steam supply unit 10, and the steam supply unit These are a tank water level detection device 34 that measures the water level inside a water supply tank that supplies water to 10 and a door open / close detection device 35 that detects whether the door 3 is in an open state or a closed state.

  The temperature detection device 32 is disposed when entering the suction port 2 a from the heating chamber 2, that is, at the inlet of the circulation duct 20. The humidity detector 31 is also installed at the same location.

  The components that operate in response to a control signal from the control device 30 include the following. In other words, in addition to the steam generating heater 13, the circulation fan 21, and the gas heater 22, the cooling fan 36 that takes in outside air into the housing and discharges the air inside the housing to the outside, and water supply The water supply pump 37 supplies water from the tank to the steam supply unit 10.

  Next, the operation of the heating cooker 1 will be described. First, the door 3 is opened, and the food is placed on the tray 7. FIG. 2 shows a state in which a total of two trays 7 are installed in the uppermost installation unit 6 and the lowermost installation unit 6. The number and installation positions of the trays 7 to be used depend on the contents of cooking. It should be determined, and FIG. 2 has no limiting meaning. The door 3 is closed, cooking conditions are input by the operation unit 5, and cooking is started.

  When cooking using steam is set, water is supplied to the steam supply unit 10 by a feed water pump 37 from a water supply tank (not shown), and then the steam generating heater 13 is energized to start generating steam. The gas heater 22 is also energized, and the gas heater 22 starts to emit radiant heat into the heating chamber 2. If a food item is placed on the upper tray 7, heating of the food item is started.

  When the steam supply unit 10 starts to discharge steam from the discharge port 12, the operation of the circulation fan 21 is started. Thereby, the gas inside the heating chamber 2 flows into the circulation duct 20 from the suction port 2a as indicated by an arrow A1. The steam flowing into the circulation duct 20 from the discharge port 12 is sucked into the circulation fan 21 and discharged to the top surface portion 20c as indicated by an arrow A2.

  The steam is heated by the gas heater 22 while passing through the top surface portion 20c. If the temperature setting of the gas heater 22 is set to maintain the steam at a temperature close to 100 ° C., cooking is performed with saturated steam, and the steam is heated to a temperature far exceeding 100 ° C. (for example, 300 ° C.). Then, cooking with superheated steam is performed.

  A portion of the steam heated by the gas heater 22 is blown out from the outlet 2c as indicated by an arrow A3, whereby the food placed on the upper tray 7 is heated so that it is wrapped with steam from above. The The steam that has not blown out from the outlet 2c is guided to the second side face portion 20b as indicated by an arrow A4.

  Part of the steam that has entered the second side surface portion 20b hits the protrusion 24 and is blown out below the upper tray 7 as indicated by an arrow A5. The steam that flows down through the nose of the protrusion 24 as shown by the arrow A6 is blown out above and below the lower tray 7 as shown by the arrows A7 and A8.

  Since the steam that has entered the second side surface portion 20b from the top surface portion 20c has downward kinetic energy, when it exits from the air outlet 2b, it blows obliquely downward as indicated by arrows A5, A7, and A8. . The steam blown obliquely downward changes its direction and flows toward the right side wall of the heating chamber 2 as indicated by an arrow A9. With this steam, the lower surface of the food placed on the upper tray 7 and the upper and lower surfaces of the food placed on the lower tray 7 are heated.

  The steam blown out from the outlet 2c is sucked in the direction of the inlet 2a. The steam flowing toward the right side wall in the heating chamber 2 rises as indicated by an arrow A10 and is guided to the suction port 2a. Since the suction port 2a is disposed above the uppermost installation portion 6, the steam blown obliquely downward from the blowout port 2b starts to rise at a substantially central portion in the left-right direction of the heating chamber 2, so that the heating chamber 2 The temperature distribution in the horizontal direction can be made uniform.

  When cooking using steam is completed, the fact is notified by voice or visual display. In response to this, the user opens the door 3 and takes out the food. If the water in the water tank is low, replenish it and prepare for the next steam cooking.

  When cooking with hot air is set without using steam, the steam supply unit 10 does not operate. The air is heated by the gas heater 22, and cooking with hot air is performed. The flow of hot air is the same as in the case of steam.

  The target value of the internal temperature of the heating chamber 2 is set for both steam cooking and hot air cooking. The control device 30 performs the maintenance of the internal temperature of the heating chamber 2 by the on / off control of the gas heater 22 and the control of the air flow rate of the circulation fan 21. This will be described with reference to FIG.

  In FIG. 4, T is a temperature target value, T1 is a first predetermined value above T, and T2 is a second predetermined value below T. When heating is started, the gas heater 22 is turned on, and the circulation fan 21 also starts blowing at the rated value. As the gas heated by the gas heater 22 circulates, the temperature in the heating chamber 2 gradually increases. Since the temperature detection device 32 is arranged at the inlet of the circulation duct 20 where the gas in the heating chamber 2 gathers, the temperature detection device 32 detects the average temperature in the heating chamber 2. Similarly, the humidity detection device 31 detects the average humidity in the heating chamber 2.

  When the temperature detection device 32 detects that the temperature in the heating chamber 2 has increased to the first predetermined value T1, the control device 30 turns off the gas heater 22. The control device 30 does not turn off the circulation fan 21 but only reduces the air flow rate. For example, when the rated air flow rate is 100%, it is reduced to a value such as 30% (this value is merely an example and has no limiting meaning). If the motor used for the circulation fan 21 is a DC motor, the reduction of the air flow rate can be easily realized by reducing the supply voltage.

  When the temperature detection device 32 detects that the temperature in the heating chamber 2 has dropped to the second predetermined value T2, the control device 30 turns on the gas heater 22, and the circulation fan 21 also has a normal air flow rate (rated rating). Return to (air flow). Since the high-temperature gas is blown out strongly, the temperature in the heating chamber 2 rises quickly. When the temperature in the heating chamber 2 rises to T1, the control device 30 turns off the gas heater 22 again, and reduces the air flow rate of the circulation fan 21. By repeating this, the internal temperature of the heating chamber 2 is maintained in the vicinity of the target value T.

  The gas heater 22 continues to supply heat to the heating chamber 2 with residual heat during the off state. At this time, if the circulation fan 21 maintains a normal air flow rate, the gas heater 22 is rapidly cooled. As a result, the internal temperature of the heating chamber 2 falls to T2 at an early stage. That is, it is not possible to earn time from turning off the gas heater 22 to turning it on again. This leads to an increase in power consumption.

  On the other hand, in the present invention, when the gas heater 22 is turned from on to off, the amount of air blown from the circulation fan 21 is reduced, so that the gas heater 22 is not easily cooled. For this reason, the time until the gas heating fan 22 is turned on again becomes longer, and the power consumption is reduced. The reduction in the power consumption of the circulation fan 21 due to the reduction in the amount of blown air also contributes to the reduction of the power consumption of the entire heating cooker 1.

  The embodiment of the present invention may be as follows.

  In a different embodiment, when the gas heater 22 is returned from the off state to the on state and the air flow rate of the circulation fan 21 is returned from the lowered state to the normal air flow rate, the control device 30 indicates that the gas heater 22 is in the on state. After returning to, the circulation fan 21 is returned to the normal air flow after a predetermined time.

  After the gas heater 22 returns from the off state to the on state, the time required for the temperature of the gas heater 22 to rise to the temperature expected in the on state, and the circulation fan 21 from the reduced air flow rate to the normal state. When comparing the time required to return to the blowing state, the former takes longer. Returning the circulation fan 21 to the normal air flow rate even when the temperature of the gas heater 22 is not sufficiently increased is a waste of electric power on the circulation fan 21 side. By causing the control device 30 to perform control for returning the circulation fan 21 to the normal air flow after a predetermined time after the gas heater 22 returns to the ON state, such waste of electric power can be avoided.

  In a different embodiment, when the gas heater 22 is returned from the OFF state to the ON state, and the air flow rate of the circulation fan 21 is returned from the lowered state to the normal air flow rate, the control device 30 changes the temperature in the heating chamber 2. After the temperature detecting device 32 detects that the temperature has increased to a predetermined temperature, the circulation fan 21 is returned to the normal air flow rate.

  For the same reason as described above, returning the circulation fan 21 to the normal air flow rate even when the temperature of the gas heater 22 is not sufficiently increased is a waste of electric power on the circulation fan 21 side. After the gas heater 22 returns to the ON state, control is performed to return the circulation fan 21 to the normal air flow after waiting for the temperature detector 32 to detect that the temperature in the heating chamber 2 has risen to a predetermined temperature. By causing the control device 30 to perform this, such waste of power can be avoided.

  In a different embodiment, it is assumed that the value of the degree of decrease is variable with respect to the decrease in the air flow rate of the circulation fan 21 due to the gas heater 22 being turned off. That is, how much the air flow rate is reduced from the rated air flow rate can be changed by an operation through the operation unit 5.

  By doing in this way, according to the environment etc. where the cooking-by-heating machine 1 was set | placed, it becomes possible to adjust the fall amount of ventilation volume optimally.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention can be widely used in a cooking device.

DESCRIPTION OF SYMBOLS 1 Heating cooker 2 Heating chamber 2a Inlet 2b, 2c Outlet 7 Tray 10 Steam supply part 20 Circulating duct 21 Circulating fan 22 Gas heater 30 Controller 32 Temperature detector

Claims (5)

A circulation fan that circulates the gas in the heating chamber, a gas heater that heats the gas that the circulation fan circulates, a temperature sensor that detects the temperature in the heating chamber, and a control device that performs overall control,
When the temperature detection device detects that the temperature in the heating chamber has risen to a first predetermined value, the control device turns off the gas heater and reduces the air flow rate of the circulation fan, Thereafter, when the temperature detector detects that the temperature in the heating chamber has dropped to a second predetermined value, the gas heater is returned to the on state, and the circulation fan is also returned to the normal air flow rate. As well as
The said control apparatus performs control which returns the said circulation fan to normal ventilation volume after predetermined time progress, after returning the said gas heater from an OFF state to an ON state . The control device returns the gas heater from an off state to an on state, and then waits for the temperature detection device to detect that the temperature in the heating chamber has risen to a predetermined temperature, and then turns the circulation fan on. The cooking device according to claim 1, wherein control is performed to return to a normal air flow rate. The cooking device according to claim 1 or 2 , wherein a value of the degree of reduction is variable with respect to a decrease in the amount of air blown by the circulation fan when the gas heater is turned off . The cooking device according to any one of claims 1 to 3, wherein the circulation fan and the gas heater are provided for a circulation duct provided outside the heating chamber . The cooking device according to any one of claims 1 to 4, wherein the temperature detection device is disposed at an inlet portion of the circulation duct .

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