JP3975013B2 - Steam generator for food heating and storage equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a steam generator for a food heating and storage device that heats and stores food.
[0002]
[Prior art]
By introducing steam into a box-shaped steamer with multiple shelves inside, it heats meat steamers, steamed rice bowls, etc. stored in the steamer and heats the food as it is after heating. There is a storage device. Since the amount of heat required differs between when food is heated and when stored, for example, steam is continuously introduced into the steamer during the heating process, and the steamer is kept at a predetermined temperature during the heating process. Steam is intermittently introduced into the tank. The steam generator that generates steam for introduction into the steamer determines the necessity of steam generation by detecting the pressure and temperature of the steam, and starts combustion when the steam pressure falls below the lower limit. Control is performed to stop combustion when the upper limit is exceeded.
[0003]
The capacity of the steam generator is selected so that the amount of steam is not deficient during the heating process with a large amount of steam used. Further, when a plurality of steamers are provided and steam is independently introduced into each steamer, the steam amount is selected so as not to be insufficient even when the plurality of steamers simultaneously perform the heating process. Therefore, when the amount of steam used is small, such as during the storage process, the capacity of the steam generator increases compared to the amount of steam used, and the steam pressure immediately rises to the upper limit even after starting combustion. Combustion will be stopped in time. If the repetition of stopping the combustion immediately after the start of combustion is repeated, the life of the steam generator is shortened. In addition, when the combustion is repeatedly started and stopped, the fluctuation of the steam pressure becomes severe, and if the fluctuation of the steam pressure is severe, the quality of the steam introduced into the steamer will not be stable, so the finished state of the product There was a problem of deterioration.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to prevent frequent start and stop of combustion due to fluctuations in the amount of steam used in a food heating and storage device with different amounts of steam used depending on the operating state.
[0005]
[Means for Solving the Problems]
It has a steamhouse that contains food, a steam generator that generates steam to be introduced into the steamer, and a steam introduction amount control device that controls the amount of steam that is introduced into the steamer. There are two operating states: a heating process that heats food in the steamer by supplying water, and a warming process that stores the food by reducing the amount of steam supplied after the heating process, compared to the heating process. In the food heating and warming apparatus, the steam generator is configured to divide the burner into a plurality of combustion sections and provide a fuel supply path so that each combustion section can perform combustion independently. The combustion control device that controls the combustion chamber receives the signal from the heating and storage control device, and changes the number of burner combustion sections during the burner combustion according to the operating state of the food heating and storage device.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. The figure shows a food heating and storage device that has two steamers and has the functions of heating and storage. FIG. 1 is a block diagram of the steam generator of the food heating and storage device, and FIG. 2 is a food heating and storage device. FIG. The food heating and warming device includes a steamer 1 part for heating food and a steam generator 10 part for generating steam to be introduced into the steamer 1.
[0007]
In the steamer 1, five shelves 6 having a drawer shape and a hole for steam circulation are provided on the bottom surface, and the food 7 to be heated is accommodated on the shelf 6. A steam supply pipe 4 is connected to the lower part of the steamer 1, and the steam supply pipe 4 is connected to a steam generator 10, and the steam generated by the steam generator 10 enters the steamer 1 through the steam supply pipe 4. Supplied. A steam control valve 8 for controlling the introduction of steam into each of the two steamers is provided in the middle of the steam supply pipe 4, and a chamber temperature detector 13 is provided in each steamer, and the steam control valve 8 and the chamber temperature detector are provided. 13 is electrically connected to the operation control device 11. The operation control device 11 controls the opening and closing of the steam control valve 8 according to the set operation state and the temperature in the steamer 1.
[0008]
The steam generator 10 is provided with a heat exchange unit 15 directly above the burner, and heats the heat exchange unit 15 by burning the burner to heat water in the heat exchange unit 15 and generate steam. The burner of the steam generator 10 is divided into a main burner 2 and a sub-burner 3, and a fuel pipe 18 for supplying fuel to the burner includes a main fuel solenoid valve 16 for controlling fuel supply to the main burner 2, and a sub-burner. A sub-fuel solenoid valve 17 for controlling the fuel supply to 3 is provided. A pressure detection device 9 is provided in the steam portion of the heat exchange unit 15, and the pressure of the steam generated by the heat exchange unit 15 is detected by the pressure detection device 9. The operation control device 11 is provided with a combustion control device 5 that controls the combustion of the steam generator 10, and the combustion control device 5 is connected to the pressure detection device 9, the main fuel electromagnetic valve 16, and the sub fuel electromagnetic valve 17. The opening and closing of the main fuel solenoid valve 16 and the sub fuel solenoid valve 17 are controlled according to the operation state in the operation control device 11 and the steam pressure detected by the pressure detection device 9, and the combustion of the main burner 2 and the sub burner 3 is performed. To control.
[0009]
The ratio of the amount of combustion between the main burner 2 and the sub-burner 3 is determined according to the amount of combustion required when a large amount of steam is required, such as in the heating process, and the amount of steam required in other cases. 3/5 of the entire burner is the main burner and 2/5 is the sub-burner.
[0010]
The steamer 1 is provided with two chambers on the left and right, and the steam generated by the steam generator 10 can be introduced through only one chamber or two chambers through the steam control valve 8. The operation control device 11 performs opening / closing control of the steam control valve 8 based on the input from the operation panel 19 and the internal temperature of the steamer 1 detected by the internal temperature detector 13. Information on the operation control by the operation control device 11 is also sent to the combustion control device 5, and the combustion control device 5 burns only the main burner 2 or burns both the main burner 2 and the sub-burner 3 according to the process at that time. Change what to do.
[0011]
When the operation panel 19 is operated by placing the food 7 on the shelf and the heating process is started, the operation control device 11 starts detecting the elapsed time, and the operation panel 19 displays that it is the heating process. The operation controller 11 opens the steam control valve 8 and sends the steam generated by the steam generator 10 into the steamer 1. Steam is continuously supplied, and the steam introduced into the steamer 1 flows upward while heating the food 7.
[0012]
In the case of the heating process, when the vapor pressure detected by the pressure detection device 9 becomes less than the lower limit value, the combustion control device 5 opens the main fuel electromagnetic valve 16 and the sub fuel electromagnetic valve 17, and the main burner 2 and the sub burner 3 burn. I do. When the steam pressure rises due to steam generation by combustion of the main burner 2 and the sub burner 3 and the steam pressure reaches the upper limit value or more, the combustion control device 5 closes the main fuel solenoid valve 16 and the sub fuel solenoid valve 17, and the main burner 2 Then, the combustion of the sub burner 3 is stopped.
[0013]
When the heating process ends, the operation control device 11 changes the process from the heating process to the warming process, and the operation panel 19 displays the warming process. The operation control device 11 controls the opening and closing of the steam control valve 8 so that the internal temperature of the steamer 1 detected by the internal temperature detection device 13 is maintained at a predetermined temperature. In the case of the warming process, when the vapor pressure detected by the pressure detection device 9 becomes less than the lower limit value, the combustion control device 5 opens the main fuel electromagnetic valve 16 and performs combustion only of the main burner 2. In the case of the warming process, since the amount of steam used is small, the steam pressure rises even when only the main burner 2 is combusted. When the steam pressure reaches the upper limit value or more, the combustion control device 5 closes the main fuel solenoid valve 16, The combustion of the main burner 2 is stopped.
[0014]
If the amount of steam used is low and heating is performed in the same way as when the amount of steam used is large, the steam pressure rises in a short time, and combustion is stopped in a short time after the start of combustion. However, when the amount of steam used is small, the rate of change in the steam pressure is reduced by reducing the burner combustion amount, and the time until the steam pressure reaches the upper limit is lengthened. The interval becomes longer.
[0015]
In addition, when there are a plurality of steamers as in this embodiment and steam can be supplied for each steamer, both the main burner 2 and the sub-burner 3 are burned when the heating process is performed simultaneously in the two chambers. You may set so that only the main burner 2 may be burned at the time of combustion in a burner and the case other than that. Further, when the steam is insufficient, such as immediately after the start of the steam generator 10, combustion is performed in both the main burner 2 and the sub-burner 3 regardless of the combustion state until the steam pressure reaches a predetermined pressure, Prevent steam shortage.
[0016]
【The invention's effect】
By practicing the present invention, the number of start and stop of combustion is reduced, and it is possible to prevent the life of the steam generator from being extended and the thawing state from varying.
[Brief description of the drawings]
[Fig. 1] Configuration diagram of the steam generator [Fig. 2] Partial cross-sectional front view of the food heating and storage device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steamer 2 Main burner 3 Sub burner 4 Steam supply piping 5 Combustion control device 6 Shelf 7 Food 8 Steam control valve 9 Pressure detection device 10 Steam generator 11 Operation control device 12 Steam exhaust port 13 Inside temperature detection device 14 Door 15 Heat Exchanger 16 Main fuel solenoid valve 17 Sub fuel solenoid valve 18 Fuel piping 19 Operation panel

Claims (2)

Steam storage unit that contains food, steam generator that generates steam to be introduced into the steamer, steam introduction amount control device that controls the amount of steam introduced into the steamer, and detection of steam pressure values in the steam generator A heating process that heats the food in the steamer by supplying steam into the steamer, and after the heating process, the steam supply amount is reduced from that in the heating process. In the food heating and warming device having two operating states of the warming process for warming, the steam generator divides the burner into a plurality of combustion parts, and each combustion part independently burns. The fuel supply path is provided so that the combustion control device that controls the combustion of the burner performs start and stop of combustion based on the signal from the pressure detection device , and the combustion control device is connected to the heating and storage control device. Food heating Built device according to whether a certain or Yutakazo step to a heating step, the food heating Yutakazo apparatus for steam generating apparatus characterized by changing the number of burners combustion section at the burner combustion practice. In the steam generator for a food heating and warming apparatus according to claim 1, when a plurality of steamers are provided and steam can be supplied independently for each steamer, the number of steamers performing the heating process. The steam generator for a food heating and warming device is characterized by changing the number of burner combustion parts when performing burner combustion.

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