JP2007252580A - Steam cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent air troubles caused by an initial supply of steam. <P>SOLUTION: The steam cooker includes a cooking chamber 2 for storing objects 1 to be cooked; a steam supplying means 3 including a steam supplying line 13 extending from a steam generator 12 to the cooking chamber 2, and a steam supplying valve 14 provided on the steam supplying line 13; a decompression means 5 for the inside of the cooking chamber 2; and a controller 28. The controller 28 performs an air discharging process and a steam-supplying cooking process. In the air discharging process, air is discharged by a decompression process, in which the steam supplying means 3 and the decompression means 5 are controlled so as to decrease pressure in the cooking chamber 2. In the steam-supplying cooking process, steam is supplied to the cooking chamber 2 and steam-supplying cooking is performed at a heating target pressure after the air discharging process. The steam supplying valve 14 is opened by the controller 28 in an initial decompression process of the air discharging process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a steam cooking apparatus that steams or boils an object to be cooked with steam.

  Conventionally, this kind of cooking apparatus is known, for example, in Patent Document 1. The cooking apparatus described in Patent Document 1 supplies steam into a cooking chamber to cook an object to be cooked.

JP 2005-65797 A

In a cooking apparatus as described in Patent Document 1, in order to perform steaming cooking effectively, a steaming cooking process is performed after an air exhausting process by decompression exhaust. In the course of research and development of steam cookers, the inventors have conducted cooking with steam (negative pressure steaming) with the pressure in the cooking chamber being lower than atmospheric pressure, and the air accumulated in the boiler at the start of steaming is cooked. The problem was that it was supplied indoors and the desired cooking could not be performed by this air (air disturbance occurred).
An object of the present invention is to prevent air damage due to initial steaming.

  The present invention has been made to solve the above-described problems. The invention according to claim 1 includes a cooking chamber for storing an object to be cooked, a steam supply line from a steam generator to the cooking chamber, and the cooking chamber. A steam supply means including a steam supply valve provided in the steam supply line, a decompression means in the cooking chamber, and an air exhaust for exhausting by a decompression step of controlling the steaming means and the decompression means to decompress the cooking chamber. And a controller for performing a steaming cooking process for steaming and cooking into the cooking chamber after the air exhausting process, and the controller opens the steaming valve in an initial decompression process of the air exhausting process. It is a feature.

  According to this invention, in the said air exclusion process, the air which exists in the said steam generator at the time of steaming start can be discharged | emitted effectively, and the poor cooking by an air failure can be prevented.

  Next, an embodiment of the present invention will be described. The embodiment of the present invention is applied to a steam cooking apparatus such as a steamer, a steamer, or a steam cooler that cooks or steams an object to be cooked with steam.

  An embodiment of the apparatus of the present invention will be specifically described. This embodiment includes a cooking chamber for storing an object to be cooked, a steaming line from a steam generator to the cooking chamber, and steaming means including a steaming valve provided in the steaming line, A decompression means, an air exclusion step for controlling the steaming means and the decompression means to perform decompression exhaust in the cooking chamber, and a steam supply cooking at the target heating pressure by steaming into the cooking chamber after the air exclusion step And a controller for performing a steam cooking process, wherein the controller opens the steam supply valve in an initial pressure-reducing step of the air exclusion process.

In this embodiment, when steam cooking is performed while maintaining the cooking chamber at a low pressure, the object to be cooked is accommodated in the cooking chamber, and first the air removal process (first air removal process) in the cooking chamber. The air exclusion process is performed. In this air exhausting step, the decompression means is operated to discharge the air in the cooking chamber to the outside of the cooking chamber. In this air evacuation step, the pressure in the cooking chamber is reduced to the pressure reduction target pressure by operating the pressure reducing means. Thereafter, the depressurizing unit is stopped, the steam supply unit is operated, and a pressurizing step is performed in which the pressure in the conditioning chamber is increased to the heating target pressure. After reaching the heating target pressure, a cooking process is performed for controlling the steaming means so that the cooking chamber pressure maintains the heating target pressure. In this cooking process, even if the pressure in the cooking chamber stops the steaming means, the pressure reducing means is basically not operated, and the pressure reducing means is operated only when the pressure in the cooking chamber rises to a set value. And control to reach the heating target pressure.

  In this embodiment, an air exclusion process (second air exclusion process) is performed to exclude air in the steam generator and the steam supply line at the start of steaming. This second air exclusion process is performed by opening the steam supply valve in the initial pressure reduction process of the air exclusion process. When the steam supply valve is opened, steam supply from the steam generator into the cooking chamber is started.

  In the steam generator, air is present in the steam generator and the steam supply line when initially supplying water or when performing steaming for the first time after the operation is stopped. The steam at the start of steaming by the steam generator includes this air, but this air is discharged to the outside together with the air in the cooking chamber by the decompression of the decompression means. As a result, cooking failure due to air failure can be prevented. In this embodiment, this cooking failure is caused by the fact that there is no air in the cooking chamber and control is performed according to the relationship between the saturated steam pressure and the temperature. In addition, poor cooking is also caused by uneven heating when air remains.

  Next, each component of this embodiment will be described. The to-be-cooked food is various steam cooking foods or ingredients such as thawed meat, and is usually stored in the cooking chamber together with the seasoning liquid in a food container (hotel pan or pan) and steamed. Cooking is done.

  The cooking chamber is a sealed container that heats and cooks food to be cooked, and includes a space for storing the food to be cooked and an opening with a door for taking the food in and out.

  The steaming means is means for supplying steam for heating the cooking object into the cooking chamber. The steaming line (pipe) connected between the cooking chamber and the steam generator and the steaming line ( And a steam supply valve provided in the piping). The steam generator (boiler) is preferably a reboiler that generates clean steam obtained by heating pure water or soft water. The steam supply valve is preferably a valve whose opening degree can be adjusted, but can be an on-off valve only for ON-OFF.

  The decompression means includes a decompression line (pipe) connected to the cooking chamber and a decompressor provided in the decompression line. The decompressor is preferably a combination of a steam ejector, a heat exchanger for condensation, and a vacuum pump or water ejector, but can be constructed by combining one or more of these elements. Moreover, this decompression means can also be used as the said steaming means.

  The cooking chamber is provided with a steaming means and a drain discharging means for discharging the internal air and steam. The steaming means includes a steaming line connected to the cooking chamber and a steaming valve provided in the steaming line. The drain discharge means includes a drain line connected to the cooking chamber and a drain discharge valve provided in the drain line.

  Further, the cooking chamber is provided with a return pressure means for returning the interior to the atmospheric pressure. The return pressure means includes a return pressure line connected to the cooking chamber, a return pressure control valve and an air purifying filter provided in the return pressure line.

  Further, the cooking chamber is provided with pressure detection means for detecting the pressure inside the cooking chamber, and temperature detection means for detecting the temperature of the object to be cooked (article temperature) as necessary. Since the saturated steam pressure in the cooking chamber has a predetermined relationship with the saturated steam temperature, the pressure detecting means can be replaced with a temperature detecting means (temperature sensor). Therefore, the pressure detection means used in the specification of this application includes a temperature detection sensor. Preferably, the temperature detecting means is a temperature sensor that directly detects the temperature of the object to be cooked by inserting a detection unit into the object to be cooked, but a sensor that indirectly detects the temperature of the object to be cooked may be used. it can.

  The control means inputs signals from the pressure detection means and the temperature detection means, and controls the steam supply means, the steaming means, the pressure reducing means, and the like based on a cooking program. The cooking program includes an air evacuation step for removing air in the cooking chamber, a steaming cooking step for steaming cooking while supplying steam into the cooking chamber and controlling to a predetermined heating target pressure after the air evacuation step, and steam cooking A return pressure step for returning the inside of the cooking chamber to atmospheric pressure after the step is included. The heating target pressure can be set to atmospheric pressure or higher, or can be set to atmospheric pressure or lower. Steaming cooking with a heating target pressure above atmospheric pressure is referred to as positive pressure cooking (also referred to as positive pressure steam cooking), and steaming cooking with heating target pressure below atmospheric pressure is referred to as negative pressure cooking (negative pressure). It can also be called steam cooking.) The heating target pressure can also be referred to as a cooking target pressure.

  The air evacuation step is performed by closing the exhaust steam valve and the drain discharge valve, operating the pressure reducing means, and reducing the pressure in the cooking chamber until the pressure in the cooking chamber reaches a pressure reduction target pressure. And after this pressure reduction process, the said pressure reduction means is stopped, the said steam supply means is operated, and it pressurizes to a steam supply target pressure (pressurization process). Here, when performing the said air exclusion process only by the pressure reduction process, the said pressurization process shall not be included in the said air exclusion process. The air evacuation step is not a one-time pressure reduction step, but the pressure reduction step is performed a plurality of times and between the pressure reduction steps, such as the pressure reduction step-the pressure step-the pressure reduction step. It can be constituted as follows. This configuration is called a plurality of vacuum pulses.

  In the steaming cooking step, after the air exhausting step, the exhaust steam valve and the drain discharge valve are closed, the operation of the decompression unit is stopped, the steaming unit is operated, and the cooking chamber pressure becomes the heating target pressure. And a cooking step of controlling the operation of the steaming means and the pressure reducing means so that the pressure in the cooking chamber maintains the heating target pressure after the pressure step.

  The cooking process in the negative pressure steaming is performed by closing the steam exhaust valve and the drain discharge valve and repeating the operation and stop of the steam supplying means, and only when the cooking chamber pressure rises by a predetermined value from the heating target pressure. The pressure reducing means is operated to cook the cooking chamber pressure at a pressure lower than atmospheric pressure.

  In this embodiment, the second air exclusion process is performed during negative pressure cooking and / or positive pressure cooking. This 2nd air exclusion process is implemented in the first pressure reduction process (initial pressure reduction process) in the air exclusion process before the steaming cooking process. The second air exclusion process is performed by opening the steam supply valve during the initial pressure reducing process. And said 2nd air exclusion process is preferably performed by opening the said steam supply valve only for the predetermined period in the middle of the said initial pressure reduction. By doing so, it is possible to solve the disadvantages when the steam supply valve is kept open, that is, the problem that decompression cannot be performed, the decompression time is long, and the energy saving is not achieved.

First, the first aspect of opening and closing the steam supply valve will be described. In this first aspect, the start of opening of the steam supply valve is preferably the time when the cooking chamber pressure P has dropped to a first set pressure P1 from the start of the initial pressure reducing step, The closing is preferably performed when the first set time T1 has elapsed from the start of opening of the steam supply valve or when the cooking chamber pressure P has decreased to the second set pressure P2. The opening degree of the steam supply valve can be configured to be adjustable with respect to an initial set value.

  In the first aspect, the following effect can be obtained by adding the condition of the second set pressure. That is, if the condition of the second set pressure is not added, if the pressure reducing capability by the pressure reducing means is stronger and the pressure decreases more and more during steaming, the pressure drops below the saturated steam pressure corresponding to the temperature of the cooking object. The food to be cooked may be cooled or scattered. By adding the condition of the second set pressure, such inconvenience can be solved. Moreover, according to this first aspect, not only can the air be removed from the steam generator or the steam supply line, but also steaming at the time of the initial decompression step, the partial pressure of the air in the cooking chamber at the end of the subsequent decompression. The effect of further lowering can be achieved.

  The first set pressure P1 can be a pressure obtained by adding the first adjustment value A to the pressure reduction target pressure P0 in the initial pressure reduction process. The depressurization target pressure P0 can be a fixed value P4 or an equivalent pressure obtained by adding the second adjustment value B to the product temperature. The first adjustment value A and the second adjustment value B can be made variable. The first set time T1 can also be made variable.

  The above is a case where the pressure reducing step in the air exclusion step is one time, but in the case of multiple times, the product temperature is confirmed before each pressure reducing step for each pressure reducing step, and the second adjustment value B is set. Can be configured to change.

  In addition, the opening and closing of the steam supply valve can be the second aspect. That is, when the state where both the condition of starting the air exclusion process and the condition that the pressure in the steam generator is equal to or higher than the third set value P3 is continued for the second set time T2, the steam supply valve Open at more than the set opening. The closing condition of the steam supply valve can be set to the time when the third time T3 has elapsed from the start of opening. This second aspect is effective when performing steaming for air exclusion at a pressure higher than that of the first aspect. Since the ability of the pressure reducing means is high by setting the pressure to a high pressure state, the air is eliminated quickly. Can be completed.

  Further, in this embodiment, in addition to the second air exclusion process, one or two of the following two second air exclusion processes can be added. Thereby, air exclusion can be performed more reliably.

  One of the additional second air exclusion processes is to forcibly eliminate the air in the cooking chamber by operating the decompression means for a predetermined time at the start of the cooking process by negative pressure cooking (forced exhaust operation). . The forced exhaust operation means that in the cooking process, the pressure reducing means may be operated to control the cooking chamber to the heating target pressure, but the pressure reducing means is operated independently of this. is doing. The forced exhaust operation is preferably performed by continuously operating the pressure reducing means, but may be configured to be performed intermittently.

  The second of the additional second air exclusion processing opens on the upstream side of the steam supply valve of the steam supply line connecting the steam generator and the cooking chamber, and opens when the detected temperature is lower than the set value, and is higher than the set value. This is done by providing an air exhaust valve that closes. According to this embodiment, since steam having a low temperature containing air flows to the air rejection valve at the beginning of the steam supply, the air rejection valve is opened and air is discharged. Since the temperature of the steam rises when the air escapes, it closes and remains closed during the subsequent steaming. The air exclusion valve may be a mechanically operated valve having a temperature detecting unit itself, or an electromagnetic valve that is opened and closed by a sensor that detects the temperature of the steam supply line.

  In the cooking step in the positive pressure cooking, the steaming valve is closed, the steaming means is operated, and the heating target pressure is set to a high pressure equal to or higher than atmospheric pressure. In this case, the drain discharge valve is intermittently opened to discharge the drain in the cooking tank. When a steam trap is provided on the downstream side of the drain discharge valve, the drain discharge valve can always be opened to discharge the drain. At the time of this positive pressure cooking, even if air is supplied with steaming, air is discharged together with the steam through the drain discharge valve and the steam trap. However, not all of the air efficiently escapes from the steam trap. Therefore, in this embodiment, the second air exclusion process is preferably performed even during positive pressure steaming.

  In the first embodiment, at least negative pressure cooking is performed, and preferably, positive pressure cooking is performed in addition to negative pressure cooking.

(Configuration of Example 1)
Hereinafter, specific Example 1 of the cooking apparatus of this invention is described in detail based on drawing. FIG. 1 is a schematic configuration diagram of the first embodiment, and FIG. 2 is a flowchart illustrating an air removal process during negative pressure steaming of the first embodiment.

  The cooking apparatus according to the first embodiment is a steam cooking apparatus that heats and cooks an object to be cooked using steam. This steam cooking apparatus is configured to selectively perform the positive pressure steaming and the negative pressure steaming.

  And the steam cooking apparatus of this Example 1 is the cooking chamber 2 which accommodates the to-be-cooked object 1, the steam supply means 3 as a heating means which supplies steam in the said cooking chamber 2 and heats the to-be-cooked object 1, The main components are a steaming means 4 for discharging the steam in the cooking chamber 2, a decompression means 5 for sucking and exhausting the cooking chamber 2, and a decompression means 6 for returning the pressure by introducing outside air into the decompressed cooking chamber 2. As a part. Then, the drain discharge means 7 for discharging the drain accumulated in the cooking chamber 2, the first pressure sensor 8 for detecting the pressure in the cooking chamber 2, and the cooking object 1 are inserted with a detection unit to prepare the cooking object temperature (product). A temperature sensor 9 for detecting (temperature) is provided.

  The cooking chamber 2 includes a door 11 (in FIG. 1, provided on the back side of the paper surface) for taking in and out the food to be cooked 1 in order to perform positive pressure steaming that steam-heats the interior at atmospheric pressure or higher. It is formed as a pressure-resistant pressure vessel.

  The steam supply means 3 is connected to the cooking chamber 2 at one end, a steam supply line (pipe) 13 for supplying steam from the steam generator 12 made of a reboiler into the cooking chamber 2, and supply of steam. A steam supply valve 14 to be controlled and a steam nozzle 15 provided in the steam supply line 13 for jetting steam into the cooking chamber 2 are configured. The steam supply valve 14 is an opening adjustment valve such as a proportional valve whose opening can be adjusted.

  The steaming means 4 is used mainly for discharging steam to the outside of the cooking chamber 2 after the completion of the positive pressure steaming exceeding the atmospheric pressure. One end of the steaming means 4 is connected to the cooking chamber 2 and the cooking chamber 2 is connected. A steaming line 16 for discharging the steam inside the room and a steaming valve 17 for controlling the steaming are configured.

  The drain discharge means 7 is for discharging the drain accumulated in the cooking chamber 2, and is connected to the cooking chamber 2 at one end and drains the drain accumulated in the bottom of the cooking chamber 2 to the outside. 18 includes a steam trap 19 that opens when a predetermined temperature or less is detected, and a drain discharge valve 21 that controls drain discharge.

  The pressure reducing means 5 includes a pressure reducing line 22 for vacuum suction and a pressure reducing device 23 formed by combining one or a plurality of ejectors, heat exchangers, vacuum pumps or water ejectors (all not shown) provided on the pressure reducing line 22 and the above. A check valve (not shown) for preventing the flow in the cooking chamber 2 direction is included.

  The return pressure means 6 includes a return pressure line (outside air introduction line) 24 having one end connected to the cooking chamber 2, a return pressure valve (outside air introduction valve) 25 provided in the line 24, an air cleaning filter 26 and a check valve. 27 is comprised.

  The valves 14, 17, 21, 25, the pressure reducer 23, the first pressure sensor 8, and the temperature sensor 9 are connected to a controller 28. The controller 28 receives a signal from the first pressure sensor 8 or the like, and controls the control valves 14, 17, 21, 25 and the decompressor 23 according to a predetermined processing procedure (cooking program). It is configured.

  The cooking program is an air evacuation process in which air in the processing chamber 2 is excluded, steam supply cooking in which steam is supplied into the cooking chamber 2 and controlled to a predetermined heating target pressure PK after the air evacuation step. The process includes a decompression process for discharging the steam in the cooking chamber 2 and restoring the pressure to atmospheric pressure after the steaming cooking process.

  The cooking program may be configured to store a plurality of programs suitable for the type of the cooking object 1 in the controller 28 and select and execute the programs according to the type of the cooking object 1 or the like. it can. As a method for selecting the cooking program, cooking information corresponding to the cooking object 1 is stored in an IC tag or barcode attached to the packaging material of the processing object 1, and cooking such as a barcode reader is performed before cooking. A method of reading the cooking information by an information reading means (not shown) and selecting a cooking program corresponding to the cooking information can be adopted. Further, the cooking information such as temperature, pressure, and time is stored as the cooking information, the cooking information is read before cooking, and the cooking is executed under the cooking conditions corresponding to the read cooking information. can do. Further, the cooking program and the cooking conditions are not stored in the controller 28 but are stored in a management device (not shown) connected to the controller 28 via a communication line or a communication network. After reading the information, it is possible to access the management device, download the cooking program and cooking conditions to the controller 28, and execute cooking.

  In the air evacuation step, the decompressor 23 is operated to continue the decompression until the pressure in the cooking chamber 2 reaches the decompression target pressure P0, and the gas is discharged. This decompression step is performed once in this embodiment.

  During this air evacuation step, a second air evacuation process for evacuating air contained in the steam generator 12 and the steam supply line 13 is executed. This 2nd air exclusion process is implemented in the decompression process (initial decompression process) in the air exclusion process before the steaming cooking process. The second air exclusion process is performed by opening the steam supply valve 14 during the initial pressure reducing process.

The opening and closing of the steam supply valve 14 is controlled as follows. That is, the start of opening of the steam supply valve 14 is the time when the cooking chamber pressure P has decreased to a first set pressure P1 from the start of the initial pressure reducing step. The steam supply valve 14 is closed when the first set time T1 (for example, about 30 seconds) has elapsed from the start of the opening of the steam supply valve 14 and the cooking chamber pressure P decreases to the second set pressure P2. When one of the conditions is met. The opening degree of the steam supply valve 14 in the second air exclusion process is, for example, about 25%. Here, the steam supply valve 14 is not fully opened and is about 25%.
This is to prevent the pressure in the cooking chamber 2 from increasing because the decompression capacity of the decompressor 23 is relatively low when fully opened. Therefore, the steam supply valve 14 can be fully opened depending on the pressure reducing capacity of the pressure reducing device 23.

  The first set pressure P1 is a pressure obtained by adding a first adjustment value A (for example, 30 hPa) to a pressure reduction target pressure P0 (for example, 100 hPa) in the initial pressure reducing process.

  The steaming cooking process is performed by operating the steaming means 3 after the air exclusion process. In the steaming cooking step, after the air exhausting step, the exhaust steam valve 17 and the drain discharge valve 21 are closed, the operation of the decompression means 5 is stopped, the steam supply means 3 is operated, and the cooking chamber 2 is operated. A pressurizing step of pressurizing until the pressure reaches the heating target pressure PK, and a cooking step of controlling the operation of the steaming means 3 so that the pressure in the cooking chamber 2 maintains the heating target pressure PK after the pressurizing step. Including.

  The cooking process in the negative pressure steaming is performed by closing the steam exhaust valve 17 and the drain discharge valve 21 and repeatedly operating and stopping the steam supply means 3, and the pressure in the cooking chamber 2 is higher than the heating target pressure P1. Only when the pressure rises by a predetermined value, the pressure reducing means 3 is operated to cook the cooking chamber 2 at a pressure lower than the atmospheric pressure.

  Moreover, the cooking process in the said positive pressure cooking closes the said exhaust steam valve 17, operates the said steam supply means 3, and makes the heating target pressure PK high pressure more than atmospheric pressure. Then, the drain discharge valve 21 is intermittently opened to discharge the drain in the cooking tank. In addition, the drain discharge valve 21 is always opened and the steam trap 19 is opened to discharge the drain.

(Operation of Example 1)
The operation at the time of negative pressure steaming of Example 1 having the above configuration will be described with reference to FIGS. 1 and 2.

  The object to be cooked 1 is put into the cooking chamber 2 and the door 11 is closed. Referring to FIG. 2, in processing step S1 (hereinafter, processing step SN is simply referred to as SN), the controller 28 includes the steam supply valve 14, the exhaust steam valve 17, the drain discharge valve 21, and the return pressure valve. 25 is closed and the decompressor 23 is operated to start the decompression process.

  In S2, it is determined whether or not the cooking chamber pressure P has reached the first set pressure P1. If NO is determined, the process stops at S2, and the cooking chamber pressure P is reduced to the first set pressure P1, and if YES is determined, the process proceeds to S3, and the steam supply valve 14 is set to a set opening degree. Open at.

  Then, steaming from the steam generator 12 to the cooking chamber 2 is started through the steaming line 13. At the beginning of this steaming, the steam contains air. Since the decompressor 23 is operated, this air is discharged out of the cooking chamber 2 along with the room air through the decompression line 22. As a result of performing the second air exclusion process in this way, cooking failure due to air failure in the steaming cooking process can be prevented.

  Thereafter, in S4, a condition that the first set time T1 has elapsed from the start of steaming and a condition that the cooking chamber pressure P has reached the second set pressure P2 are determined. If any one of the conditions is satisfied, the process proceeds to S5, the steam supply valve 14 is closed, and the second air exclusion process is terminated.

Then, it transfers to S6 and it is determined whether the said cooking chamber pressure P reached | attained the pressure reduction target pressure P0. If YES is determined here, the air exclusion process is terminated, and the process proceeds to S7.
The steaming cooking process which is the next process is performed.

  In this steaming cooking process, a pressurizing process is performed in which the operation of the decompressor 23 is stopped, the steaming means 3 is operated, and pressurization is continued until the pressure in the cooking chamber 2 reaches the heating target pressure PK. Is called. After the pressurizing step, the controller 28 performs the cooking step by controlling the opening and closing of the steam supply valve 14 so that the pressure in the cooking chamber 2 becomes the heating target pressure PK lower than the atmospheric pressure. In this steaming cooking step, when the pressure in the cooking chamber 2 becomes higher than the heating target pressure PK by a predetermined value, the decompressor 23 is operated to reduce the pressure for maintaining the cooking chamber 2 pressure at the heating target pressure PK. (Pressure holding pressure reduction) Operation is performed.

  When this steaming cooking process is completed, the controller 28 closes the steaming valve 14, stops the operation of the pressure reducing device 23, opens the pressure-reducing valve 25, and performs a return pressure. Thereby, the pressure in the cooking chamber 2 is restored from the heating target pressure PK to the atmospheric pressure.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Hereinafter, a configuration different from that of the first embodiment will be described.

  The difference from the first embodiment is that the steam generator 12 is provided with a second pressure sensor 29 for detecting the pressure in the can and inputting a detection signal to the controller 28, and for the second air rejection. The point is that the processing is performed by another method. This second air exclusion process is performed in the process sequence of FIG. 4 during the air exclusion process. In FIG. 4, the same processing steps as those in FIG.

  That is, in FIG. 4, in step S <b> 1, the controller 28 closes the steam supply valve 14, the exhaust steam valve 17, the drain discharge valve 21, and the return pressure valve 25, operates the decompressor 23, Start.

  In S10, the second set time T2 indicates that the condition that the air exclusion process is started and the condition that the pressure of the steam generator 12 detected by the second pressure sensor 29 is equal to or higher than the third set pressure P3 are satisfied. It is determined whether or not it is continued (for example, about 30 seconds). If YES is determined, the pressure P in the cooking chamber has been reduced moderately, the process proceeds to S3, and the steam supply valve 14 is opened at a set opening degree.

  Then, the steam supply from the steam generator 12 to the cooking chamber 2 is started. And as a result of performing the 2nd air exclusion process similar to the said Example 1, the cooking defect by the air failure in the said steaming cooking process can be prevented.

  Thereafter, in S11, it is determined whether or not the third set time T3 has elapsed since the start of steaming. If YES is determined here, the process proceeds to S5, the steam supply valve 14 is closed, and the second air exclusion process is terminated.

  This invention is not limited to the said Example 1, 2, It can comprise so that said 2nd air exclusion process may be performed also at the time of positive pressure cooking similarly to the time of negative pressure cooking.

It is explanatory drawing which shows schematic structure of Example 1 of this invention. It is a timing chart figure explaining the operation | movement at the time of the negative pressure cooking of the Example 1. FIG. It is explanatory drawing which shows schematic structure of Example 2 of this invention. It is a timing chart figure explaining the operation at the time of negative pressure cooking of the Example 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 To-be-cooked object 2 Cooking room 3 Steaming means 4 Steaming means 5 Pressure reducing means 6 Pressure-reducing means 28 Controller

Claims (1)

A cooking chamber for storing an object to be cooked; a steam supply line including a steam supply line from the steam generator to the cooking chamber; and a steam supply valve provided in the steam supply line; a decompression means in the cooking chamber; A controller for performing an air exhausting step of exhausting by a decompression step of controlling the steaming means and the decompression means to decompress the cooking chamber, and a steaming cooking step of steaming and cooking into the cooking chamber after the air exhausting step; Prepared,
The said controller opens the said steam supply valve in the initial pressure reduction process of the said air exclusion process, The steam cooking apparatus characterized by the above-mentioned.

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