JP2006308199A - Cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooker improved in safety by lowering an exhaust temperature with simple constitution. <P>SOLUTION: The cooker comprises a steam generator 4 for generating steam, a steam superheater 5 raising the temperature of steam from the steam generator 4, and a heating chamber 1 for heating a heated object with steam supplied from the steam superheater 5. A heat exchanging part 20 exchanges heat between exhaust air exhausted outside through an exhaust port 10 provided at the heating chamber 1, and water supplied to the steam generator 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a cooking device that cooks food to be cooked, and more particularly to a cooking device that heats food to be cooked with overheated steam at 100 ° C. or higher.

  2. Description of the Related Art Conventionally, as a heating cooker, one that heats cooked foods or the like to be cooked with superheated steam of 100 ° C. or higher obtained by further heating saturated steam is known. In this cooking device, saturated steam is generated with water supplied from a water supply tank or the like by a saturated steam generator, and the saturated steam is further heated by a superheated steam generator to generate superheated steam. When this superheated steam is supplied into the heating chamber containing the object to be cooked and cooking is performed, and the heating time suitable for the object to be cooked has elapsed, the supply of the superheated steam is stopped and the cooking is completed.

  By using superheated steam, it is possible to prevent moisture from evaporating in the material to be cooked and cook with a moist finish. In addition, since superheated steam has a higher thermal conductivity than air, cooking time can be shortened, and the supply of superheated steam makes the heating chamber close to anoxic state, which can reduce oxidation of the object to be cooked. It becomes possible.

  In a heating cooker, in order to continuously or intermittently supply externally generated steam to the heating chamber, the air (or steam) present in the heating chamber is expelled by the steam supplied to the heating chamber. In this way, it is discharged from the exhaust port to the outside of the heating chamber.

  However, the air or steam exhausted from the heating chamber is very dangerous because it is hot.

  Here, in Japanese Patent Laid-Open No. 2003-336846, the exhaust is condensed by a heat dissipating part provided at the exhaust port so that it is not released outside the cooker, but the high-temperature steam is not released outside. Since the heat radiating section exchanges heat with the superheated steam with high energy that is exhausted, the temperature of the heat radiating section becomes very high. As a result, the surrounding housing also becomes hot, and there is a risk of burns.

Moreover, in the said Unexamined-Japanese-Patent No. 2003-336846, the heat | fever storage material is installed in an evaporation member, and the temperature fall of the evaporation member when water is supplied with respect to an evaporation member is prevented. Especially when used in winter, if low-temperature water is supplied, the temperature of the heat storage material decreases, and the heat storage material once lowered in temperature has a large heat capacity. Occurrence becomes difficult.
JP 2003-336846 A

  Therefore, an object of the present invention is to provide a cooking device that can improve the safety by reducing the exhaust temperature with a simple configuration.

In order to achieve the above object, the heating cooker of the present invention is
A steam generator for generating steam;
A steam superheater for heating the steam from the steam generator;
A heating chamber for heating an object to be heated by steam supplied from the steam superheater;
A heat exchanging unit that performs heat exchange between the exhaust discharged to the outside through an exhaust port provided in the heating chamber and the water supplied to the steam generator is provided.

  According to the heating cooker having the above configuration, the heat of the exhaust discharged to the outside through the exhaust port provided in the heating chamber is taken away by the water supplied to the steam generator through the heat exchange unit, and cooking is performed. The temperature of the exhaust from the vessel is lowered and safety is improved.

  Moreover, the heating cooker of one Embodiment provided the said heat exchange part in the said exhaust port vicinity of the said heating chamber, It is characterized by the above-mentioned.

  According to the cooking device of the above embodiment, by providing the heat exchanging part in the vicinity of the exhaust port of the heating chamber, the exhausted heat can be efficiently transmitted to water at a high temperature, so that the steam generator Water to be fed becomes high temperature, and steam can be generated instantaneously by preventing temperature drop of the steam generator, and steam can be efficiently supplied to the heating chamber.

Moreover, the heating cooker of one embodiment is
A first exhaust path for exhausting the exhaust from the exhaust port of the heating chamber to the outside;
A second exhaust path for exhausting the exhaust from the exhaust port of the heating chamber to the outside through the heat exchange unit;
A switching unit that switches whether exhaust from the exhaust port of the heating chamber is discharged to the outside from the first exhaust path or exhaust from the exhaust port of the heating chamber to the outside from the second exhaust path; It is provided with.

  According to the cooking device of the above embodiment, for example, when the exhaust temperature is lowered, such as when the door is suddenly opened during cooking and the cooking is resumed again, the switching unit switches to the first exhaust path. It is possible to perform control such as discharging directly to the outside without performing heat exchange, and switching to the second exhaust path by the switching unit after a predetermined time has elapsed and exchanging heat between the exhaust and water. Thereby, the temperature fall of the water warmed by exhaust_gas | exhaustion can be prevented.

Moreover, the heating cooker of one embodiment is
An exhaust temperature measuring section for measuring the temperature of the exhaust from the exhaust port of the heating chamber;
And a control unit that controls the switching unit so that the switching unit switches to the second exhaust path when the temperature of the exhaust gas measured by the exhaust temperature measuring unit is equal to or higher than a predetermined temperature. .

  According to the heating cooker of the above embodiment, based on the temperature of the exhaust gas measured by the exhaust gas temperature measurement unit, the control unit can operate the switching unit with high accuracy, so that the water can be preheated without lowering the temperature, The temperature drop of the steam generator can be prevented.

  As is clear from the above, according to the heating cooker of the present invention, it is possible to realize a heating cooker that can improve the safety by reducing the exhaust temperature.

  Hereinafter, the cooking device of the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a heating cooker according to a first embodiment of the present invention, and FIG. 2 is an example of a heat exchanging unit between heat of exhaust gas and water sent to a steam generator.

  In FIG. 1, food 2 is placed on a setting table 3 in the heating chamber 1 for cooking, and the user puts water into the water supply tank 6 in advance before cooking. Is possible. Water in the water supply tank 6 is sent to the steam generator 4 by the water pump 7 through the water supply path 8 through the heat exchange unit 20. The configuration of the steam generator 4 is not particularly limited, and a configuration in which a water supply path and a cast aluminum heater or an aluminum cast heater are provided and heated is also possible.

  The water sent to the steam generator 4 is heated to immediately become steam at 100 ° C., passes through the steam path 9, becomes superheated steam at 100 ° C. or higher in the steam superheater 5 at the upper part of the heating chamber 1, and is heated to the heating chamber 1. Is erupted. Here, the installation location of the steam superheater is not particularly limited, but the configuration in which the steam superheater is installed at the top and directly applies the superheated steam to the food leads to shortening of the cooking time.

  When cooking is started, superheated steam is jetted into the heating chamber 1, the air in the heating chamber 1 that was originally pushed out is pushed out of the cooker through the exhaust port 10, and the heating chamber 1 is eventually filled with superheated steam, The heating chamber 1 is in an oxygen-free state. Thereby, the cooking which suppressed the oxidation of food is attained. Here, since the gas released to the outside of the heating chamber 1 due to the superheated steam supplied to the heating chamber 1 is at a high temperature, if it is released to the outside as it is, hot air or high-temperature steam is ejected, which is very dangerous. . Even if a heat radiating plate is installed in the exhaust part and the high-temperature steam is condensed in the heat radiating part, and the release of steam to the outside is prevented, the high-temperature gas and the heat of the heat radiating plate cannot be suppressed, which is dangerous.

  FIG. 2 is a cross-sectional view of the exhaust heat exchange section 20. As shown in FIG. 2, the exhaust port 10 installed in the heating chamber 1 has the function of releasing excess gas in the heating chamber 1 to the outside and maintaining the pressure in the heating chamber 1 at atmospheric pressure. The heat is transferred to the water in the water supply path 8 by the heat exchange fins 21 installed on the outer periphery of the water supply path 8 while the water is being supplied from the water supply pump 7 to the steam generator 4. Water that has been heated by the exhaust heat stays in the water supply path 8, and when water is sent to the steam generator 4 by the water supply pump 7, hot water flows into the steam generator 4 to prevent the temperature of the steam generator 4 from decreasing. Immediately heated by the heater 12 and exits the steam path 9 as 100 ° C. steam.

  Here, since the water deprived of the exhaust heat causes convection in the water supply path 8, the heat exchange fins 21 installed in the water supply path 8 are subjected to processing such as increasing the number of fins so that the lower part can exchange heat more easily. Can exchange heat more efficiently.

  In addition, the exhaust from the heating chamber 1 is deprived of heat by water in the heat exchanging unit 20, and the exhaust whose temperature has been lowered is discharged to the outside through the exhaust port 10. Further, when the exhaust gas contains steam, it becomes water in the heat exchange unit 20 and returns to the heating chamber 1 again.

  According to the heating cooker having the above-described configuration, the heat of the exhaust discharged to the outside through the exhaust port 10 provided in the heating chamber 1 is taken into the water supplied to the steam generator 4 through the heat exchange unit 20. As a result, the temperature of the exhaust gas from the cooking device is lowered, and safety is improved.

  In addition, by providing the heat exchanging unit 20 in the vicinity of the exhaust port 10 of the heating chamber 1, the exhausted heat can be efficiently transferred to water by the heat exchanging unit 20 while maintaining a high temperature. Water to be sent becomes high temperature, and steam can be instantly generated by preventing temperature drop of the steam generator 4, and steam can be efficiently supplied to the heating chamber 1.

(Second Embodiment)
Next, FIG. 3 shows a schematic configuration diagram of a main part of the heating cooker according to the second embodiment of the present invention. The heating cooker according to the second embodiment has an exhaust gas switching function. In the main part of the heating cooker of the second embodiment, the same reference numerals are assigned to the same components as the main part of the heating cooker of the first embodiment except for the exhaust path, and the description thereof is omitted.

  As shown in FIG. 3, a path that leads from the exhaust port 10 installed in the heating chamber 1 to the heat exchanging unit 20 through the inlet 20 a and a bypass path 24 that discharges outside without passing through the heat exchanging unit 20 are switched. Switching at unit 22. An exhaust temperature measuring unit 23 that measures the exhaust temperature is attached to the exhaust port 10. A path that flows from the inlet 20a to the outlet 20b via the heat exchanger 20 is a first exhaust path, and a path that flows from the inlet 20a to the outlet 20b via the bypass path 24 is a second exhaust path.

  The surplus gas discharged from the heating chamber 1 is cooled from the exhaust port 10 installed in the heating chamber 1 through the heat exchanging unit 20 and then released to the outside of the cooker. However, the switching unit 22 can switch whether the heat is discharged to the outside through the heat exchange unit 20 or exhausted through the bypass path 24 as it is. For example, after the exhaust temperature measuring unit 23 for measuring the exhaust temperature is installed at the exhaust port 10 and the exhaust temperature is equal to or higher than a predetermined temperature, the switching unit 22 is driven and guided to the heat exchanging unit 20 to perform heat exchange. , Release to the outside. However, after a while has elapsed since the start of cooking, since the inside of the heating chamber 1 is almost filled with superheated steam, all the superheated steam returns to water in the heat exchanging section 20, and the exhaust gas hardly goes outside. .

  FIG. 4 shows a block diagram of the cooking device. In FIG. 4, 23 is an exhaust temperature measuring unit, 31 is a control unit, 32 is a key input unit, 33 is a display unit, and 34 is a water tank water level detection for detecting the water level of the water tank 6 (shown in FIG. 1). 35, a water supply circuit for driving a water feed pump 7 (shown in FIG. 1), 36 a steam superheat circuit for controlling a steam superheater (not shown) of the steam superheater 5 (shown in FIG. 1), 37 A steam generating circuit 38 for controlling the steam generating heater 12 of the steam generator 4, and an exhaust path switching circuit for switching the switching unit 22.

  The control unit 31 includes a microcomputer, an input / output circuit, and the like, and receives signals from the exhaust temperature measurement unit 23, the key input unit 32, the water tank water level detection circuit 34, and the like, and receives a water supply circuit 35 and a steam superheat circuit 36. And the steam generation circuit 37 and the exhaust path switching circuit 38 are controlled.

  FIG. 5 shows a flowchart of the operation of the control unit 31. Hereinafter, the operation of the control unit 31 will be described with reference to FIG.

  First, when the cooking process starts, in step S1, the steam generating heater 12 (shown in FIG. 3) is turned on and the steam superheater is turned on.

  Next, it progresses to step S2 and a ventilation fan is turned on and steam supply is started. This blower fan (not shown) supplies the steam generated from the steam generator 4 to the heating chamber 1 via the steam superheater 5.

  Next, it progresses to step S3 and switches the switch part 22 to the bypass path | route 24 side.

  Next, the process proceeds to step S4, where it is determined whether or not the end time has elapsed, and if it is determined that the end time has elapsed, the cooking is terminated while if it is determined that the end time has not elapsed, Proceed to S5.

  In step S5, the exhaust temperature measuring unit 23 measures the exhaust temperature.

  Next, the process proceeds to step S6, where it is determined whether or not the exhaust temperature exceeds a predetermined temperature. If it is determined that the exhaust temperature exceeds the predetermined temperature, the process proceeds to step S7 and the switching unit 22 is switched to the heat exchange unit 20 side. After that, the process returns to step S4.

  On the other hand, if it is determined in step S6 that the exhaust gas temperature is equal to or lower than the predetermined temperature, the process proceeds to step S8, the switching unit 22 is switched to the bypass path 24 side, and then the process returns to step S4.

  By performing the above, for example, when the second cooking is started in the state where the water in the heat exchanging unit 20 is already warmed by the first cooking at the time of continuous cooking, the low temperature gas is heated in the heating chamber 1. It is possible to prevent the water discharged from the water and warmed by the steam generator 4 from being cooled.

  The above configuration is not limited to the above embodiment, and by providing a heat storage material in the heat exchanging unit 20, higher temperature water can be supplied to the steam generator 4, and the temperature of the steam generator 4 at the time of water supply Reduction can be minimized and steam can be generated immediately. In addition to the exhaust temperature, the temperature of the water in the heat exchanging unit 20 is also detected. If the exhaust temperature is higher than the temperature of the water in the heat exchanging unit 20, the water in the heat exchanging unit 20 is passed through the heat exchanging unit 20. If the temperature is higher, the temperature drop of the steam generator 4 at the time of water supply can be minimized by discharging directly to the outside without passing through the heat exchanging section 20, and steam can be generated immediately.

  In the said 1st, 2nd embodiment, although the heat exchange fin 21 was provided in the outer periphery of the water supply path | route 8, and also the heating cooker provided with the heat exchange part 20 of the double pipe structure which covers the circumference | surroundings with a cylinder was demonstrated. The configuration of the heat exchange unit is not limited to this, and the present invention may be applied to a heating cooker including a heat exchange unit having another structure.

  Further, the cooking device of the present invention is not limited to the first and second embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a schematic configuration diagram of a heating cooker according to a first embodiment of the present invention. FIG. 2 is a schematic view of the heat exchange part of the cooking device. FIG. 3 is a schematic view of a heating cooker according to the second embodiment of the present invention. FIG. 4 is a block diagram of the cooking device. FIG. 5 is a flowchart showing the operation of the controller of the cooking device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heating chamber 2 ... Food 3 ... Installation stand 4 ... Steam generator 5 ... Steam superheated part 6 ... Water supply tank 7 ... Water supply pump 8 ... Water supply route 9 ... Steam route 10 ... Exhaust port 12 ... Steam generating heater 20 ... Heat exchange Unit 22 ... Switching unit 23 ... Exhaust temperature measuring unit 24 ... Exhaust path 31 ... Control unit 32 ... Key input unit 33 ... Display unit 34 ... Water level detection circuit for water tank 35 ... Water supply circuit 36 ... Steam overheat circuit 37 ... Steam generation circuit 38 ... Exhaust path switching circuit

Claims (4)

A steam generator for generating steam;
A steam superheater for heating the steam from the steam generator;
A heating chamber for heating an object to be heated by steam supplied from the steam superheater;
Heat cooking characterized by comprising a heat exchanging part for exchanging heat between the exhaust discharged to the outside through an exhaust port provided in the heating chamber and the water supplied to the steam generator vessel. The heating cooker according to claim 1, wherein
A heating cooker, wherein the heat exchanging portion is provided in the vicinity of the exhaust port of the heating chamber. The heating cooker according to claim 1 or 2,
A first exhaust path for exhausting the exhaust from the exhaust port of the heating chamber to the outside;
A second exhaust path for exhausting the exhaust from the exhaust port of the heating chamber to the outside through the heat exchange unit;
A switching unit that switches whether exhaust from the exhaust port of the heating chamber is discharged to the outside from the first exhaust path or exhaust from the exhaust port of the heating chamber to the outside from the second exhaust path; A heating cooker comprising: The cooking device according to claim 3,
An exhaust temperature measuring section for measuring the temperature of the exhaust from the exhaust port of the heating chamber;
And a control unit that controls the switching unit so that the switching unit switches to the second exhaust path when the temperature of the exhaust gas measured by the exhaust temperature measuring unit is equal to or higher than a predetermined temperature. Cooking cooker.

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