JP3118616U - Hotel pan electromagnetic induction heating device - Google Patents

Abstract

Provided is a hotel pan electromagnetic induction heating device that can heat and keep food contained in a hotel pan to an appropriate temperature by directly heating the hotel pan itself by electromagnetic induction heating.
A hotel pan electromagnetic induction heating device 10 includes an electromagnetic induction heating casing 2 provided in multiple stages, a hotel pan 4 to be heated, a controller 6 that controls an inverter and a cooling device, and a storage box 8. It can be sealed by the front door 12 that can be opened and closed.
The electromagnetic induction heating housing 2 is installed in a plurality of stages in a shelf shape by guide rails 14 provided in the storage box 8, and the hotel pan 4 faces the electromagnetic induction heating housing 2 and has a predetermined gap. And is installed at a predetermined position by being guided by another guide rail 16.
[Selection] Figure 1

Description

  The present invention relates to a hotel pan electromagnetic induction heating apparatus that heats and keeps food contained in a hotel pan to an appropriate temperature by causing the hotel pan itself to generate heat by electromagnetic induction heating.

  Conventionally, IH cooking heaters using electromagnetic induction heating (hereinafter referred to as “IH”, induction-heating) as a heat source have been used for home use and business use for reasons of high efficiency and safety.

  For example, in the example shown in Japanese Patent Laid-Open No. 2001-190404, an annular heating coil, a cooked utensil having a heating part magnetically coupled to the heating coil, and energization of the heating coil to heat the heating part The heating part of the cooked utensil is at least up to the curved surface part in the outer peripheral direction on the bottom of the cooked utensil, and the heating coil is heated at the center between the annular inner periphery and the outer periphery. An electromagnetic induction heating cooker is shown that is located in the vicinity of the curved surface portion in the outer peripheral direction on the bottom surface of the appliance (Patent Document 1).

  Moreover, in the example shown in Unexamined-Japanese-Patent No. 2002-308107, it consists of the service cart which has a multistage support body inside, the tray mounted on a support body, and tableware, and provided a heating coil in a tray, The tableware is provided with a heating element that generates heat by receiving the electromagnetic force generated by the heating coil. When a tray with tableware is placed on the support of the service cart, electricity is generated between the heating coil and the service cart. An electromagnetic heating device that forms a circuit and heats dishes by supplying a high-frequency current from the service cart to a heating coil to generate heat from a heating element is disclosed (Patent Document 2).

  When such an IH cooking heater is used and an attempt is made to deliver a meal from a central kitchen or main kitchen to a satellite kitchen or pantry, etc., an individual tray-made meal is placed on the distribution car. In addition, there is a method of transporting the distribution car in a cold car and reheating it in the satellite kitchen, or putting ingredients in the hotel bread and transporting in a cold car and then reheating after reheating in the satellite kitchen or reheating after filling. is there.

JP 2001-190404 A JP 2002-308107 A

However, in the former method, since the entire car is transported, there is a tendency that a transport vehicle such as a cold car tends to increase in size, and a small turn does not work, and the number of meals that can be transported is not large.
On the other hand, when the latter method is adopted, since the object to be transported is a hotel pan, it is possible to reduce the size of the transport vehicle, and it is easy to transport to a plurality of facilities and the like because of the small turn. .

As a method of heating the ingredients put in the hotel bread, there are methods such as hot air circulation (including steam circulation) and hot water bath.
In the hot water circulation method, equipment that generates hot air and steam and equipment for circulating it are required, which increases the size of the equipment, and when multiple ingredients are heated at the same time, control them to the optimum temperature for each. Is difficult. In addition, energy efficiency deteriorates due to the heat exchange system using air or steam as a medium.

  The main purpose of the hot water method is heat insulation, which is insufficient for reheating. A method such as vacuum cooking by hot water bath is also possible, but in this case, it is necessary to perform vacuum packaging in the central kitchen, which increases the equipment and labor for that.

  The present invention has been made in view of such problems, and by using electromagnetic induction heating as a heat source and directly heating the hotel pan itself by electromagnetic induction heating, the food stored in the hotel pan can be heated to an appropriate temperature. It is an object of the present invention to provide a hotel pan electromagnetic induction heating device that can be heated and kept warm.

  In order to achieve the above object, the invention according to claim 1 of the hotel pan electromagnetic induction heating device of the present invention comprises an electromagnetic induction heating casing having a heating coil therein, a hotel pan as a heated object, and at least a high frequency. A controller for controlling the inverter and a storage box for storing these are provided. An electromagnetic induction heating case is provided in a shelf shape in the storage box, and a hotel pan is provided corresponding to the electromagnetic induction heating case. The hotel pan itself is heated by electromagnetic induction heating, and the food contained in the hotel pan is heated.

The invention described in claim 2 is characterized in that, in addition to the above configuration, the storage box includes a cooling device that drives the radiator and the cooler, and the inside of the storage box can be cooled and kept cool.
Further, the invention described in claim 3 is characterized in that the storage box is provided with a caster and can be used as a distribution vehicle having either a cold insulation function and / or a thermal insulation function.

The invention described in claim 4 is characterized in that the electromagnetic induction heating casing has one and a plurality of heating coils that can heat one or a plurality of hotel pans. is there.
The invention according to claim 5 is characterized in that the controller makes it possible to correct the heating temperature based on the rise in the core temperature of the food after the output of the high-frequency inverter is stopped.

In the hotel pan electromagnetic induction heating device of the present invention, a high frequency magnetic field is generated by the high frequency current flowing through the heating coil in the electromagnetic induction heating casing, and the generated high frequency magnetic field is generated on the bottom surface of the hotel pan corresponding to the electromagnetic induction heating casing. Since an eddy current flows in the direction of cancellation, Joule heat is generated by the electrical resistance of the hotel pan and the hotel pan itself generates heat, so that the stored food can be heated to an appropriate temperature and kept warm.
Furthermore, since the hotel pan electromagnetic induction heating device of the present invention has a cold keeping function, it can keep cold and warm and can also be used as a distribution car.

  Hereinafter, a preferred embodiment of a hotel pan electromagnetic induction heating device according to the present invention will be described in detail using the same reference numerals for substantially the same or corresponding members based on FIGS. 1 to 7.

FIG. 1 is a schematic front view of a hotel pan electromagnetic induction heating device according to the present embodiment.
Referring to FIG. 1, a hotel pan electromagnetic induction heating device 10 according to the present embodiment controls a multi-stage electromagnetic induction heating casing 2, a hotel pan 4 to be heated, an inverter, and a cooling device. A controller 6 and a storage box 8 are provided and can be sealed by a front door 12 that can be opened and closed.

The electromagnetic induction heating housing 2 is installed in a plurality of stages in a shelf shape by guide rails 14 provided in the storage box 8, and the hotel pan 4 faces the electromagnetic induction heating housing 2 and has a predetermined gap. And is installed at a predetermined position by being guided by another guide rail 16.
If the top plate 32 has at least one of non-magnetic and heat resistance, the hotel pan 4 may be placed directly on the top plate 32.

The storage box 8 and the door 12 are covered with a heat insulating material and can be kept warm or cold.
The storage box 8 is provided with a caster 18 so that it can be used as a distribution car, and can be locked at the stop position.

FIG. 2 is a view showing an overview of the electromagnetic induction heating casing according to the present embodiment.
3 is a cross-sectional view of the electromagnetic induction heating casing guided by the guide rail, taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG.

  2, 3 and 4, the electromagnetic induction heating housing 2 according to the present embodiment includes a case 21, a mounting base 23 formed in a convex shape on the bottom of the case, and a first heating coil. A first support plate 28 attached with insulation 22, a second support plate 30 with insulation attached to the second heating coil 24 and the third heating coil 26, and a top plate 32. The first support plate 28 and the second support plate 30 are fixed to the mounting base 23 with screws, and the case 21 is hermetically sealed by the top plate 32 except for the opening 34.

In the present embodiment, a sealed structure is taken into consideration that some steam is generated by heating the food. However, the top plate 32 may be easily removable so that heat radiation from the heating coil itself can be appropriately performed.
The top plate 32 has a flat plate shape, but may have a tray shape with a U-shaped cross section.

The first heating coil 22, the second heating coil 24, and the third heating coil 26 are connected in series.
Each heating coil terminal is drawn out from an opening 34 provided in the rear part of the electromagnetic induction heating housing 2 and is supplied with power from a high-frequency current source (not shown) provided in the lower part of the storage box 8. .
The first to third heating coils are magnetic force generating coils, and the high-frequency current source generates a high-frequency magnetic field by flowing a current of, for example, 20 kHz from the high-frequency inverter to the heating coil.

  The heating coil may be made of a litz wire, but in this embodiment, since it has a sealed structure, heat radiation may not be sufficient, and when the heating coil itself is assumed to be 200 ° C. or higher, copper is used. It is possible to withstand higher temperatures by using coils and using coils wound with appropriate gaps between the wires.

  Although three types of heating coils in the present embodiment are provided as in the first to third heating coils, only the first heating coil that occupies the entire case 21 may be provided, and the material to be heated is used. It is preferable to set and provide an appropriate position and turn and pitch of the heating coil according to the size.

The object to be heated is the hotel pan 4 made of stainless steel in this embodiment, but it is magnetically coupled to the high frequency magnetic field generated by the heating coil, and eddy current flows in the direction to cancel out this high frequency magnetic field, generating Joule heat. Any type is acceptable.
The object to be heated is preferably a substance capable of being magnetized, and for example, a hotel pan made of iron oxide, chromium oxide, cobalt, ferrite, or the like, which is a magnetic material, is preferable.

Both sides of the case 21 are formed with projections 36 that fit into the grooves of the guide rail 14, and can be slid on the guide rail 14, and are fixed with screws or the like after being attached.
The top plate 32 is preferably made of a nonmagnetic material. For example, ceramics, hard glass, heat resistant resin, or the like can be used.

FIG. 5 is a side view showing the side of the storage box according to the present embodiment.
Referring to FIG. 5, in the present embodiment, not only can hotel pan 4 itself be heated, but also cooling device 42, radiator 44 provided on the inner wall surface of the storage box, and provided inside the storage box. A cooler (not shown) is provided, and cooling is possible so that the inside of the storage box 8 can be maintained in a chilled temperature zone (0 to 3 ° C.).

  Therefore, in the present embodiment, the heating apparatus can be used as an arrangement car equipped with a plurality of stages and having a cold insulation function, the hotel pan 4 is stored in the chilled temperature zone inside the arrangement car, and the hotel pan is stored in the arrangement car. When necessary, the core temperature of the food stored in the hotel pan 4 can be raised to an appropriate temperature, for example, 75 ° C., and served.

  In the present embodiment, a temperature sensor such as a thermistor is provided in the storage box and the temperature in the storage box 8 is detected so that the inverter can be controlled by detecting the core temperature of food in each hotel pan. Thus, a temperature sensor is provided so that cooling and cooling control can be performed.

Next, the operation of this embodiment will be described.
FIG. 6 is a block diagram for controlling heating and cooling in the present embodiment.
In FIG. 6, 42 is a cooling device, 46 is a controller having a timer function, 48 is a first inverter, 49 is a second inverter, and 52 is provided to detect the core temperature of ingredients inside the hotel pan 4. A temperature sensor such as a thermistor, and 54 is a temperature sensor for cooling the interior.

  2 and 6, the first hotel pan 55 is connected to the first heating coil 22, the second hotel pan 56 is connected to the second heating coil 24, and the third hotel pan 58 is connected to the third heating coil 22. The heating coil 26 is installed at a corresponding location.

  First, based on the temperature sensor 54, the controller 46 controls the cooling device 42 so as to cool the interior to a chilled temperature zone, 0 to 3 ° C., and keeps it cool.

  Next, in accordance with the serving time, the controller 46 shifts from the cold insulation control to the heating control by the timer function. Next, a high frequency magnetic field is generated by passing a current of, for example, 20 kHz from the first inverter 48 to the first heating coil and from the second inverter 49 to the second heating coil 24 and the third heating coil 26. On the bottom surface of each hotel pan, an eddy current flows in a direction that cancels the high-frequency magnetic field, Joule heat is generated based on the electrical resistance and eddy current of the hotel pan, and the hotel pan itself generates heat.

  At this time, a plurality of heating coils are connected to one second inverter 49, but the controller 46 controls the heating coils 22, 24, and 26 to heat evenly.

  And the foodstuff accommodated by the heat_generation | fever of hotel bread 55,56,58 itself is heated.

Next, when the temperature reaches a predetermined set temperature, for example, 75 ° C., the controller 46 shifts to heat retention control based on the temperature detected by the temperature sensor 52.
Heating control and heat retention control measure the core temperature of the food to be heated by the temperature sensor 52, heat it to a preset heating temperature, and then lower the output of the inverter to keep the temperature at the preset heat retention temperature. , Intermittently turn the output on or off.

  In the example shown in FIG. 6, a case where a plurality of hotel pans corresponding to a plurality of heating coils is heated is shown. However, when a hotel pan is placed only on a part of the heating coils, the quantity of the hotel pans It is desirable to have a function of adjusting the output of the inverter according to the above.

  In addition, it is desirable to heat the ingredients while the lids of the hotel pans 55, 56, and 58 are closed. As a result, the diffusion of radiant heat from the hotel pans 55, 56, and 58 is reduced, and heating from the surroundings of the food material becomes possible. Furthermore, if a drop lid or a paper lid is used, the effect can be expected to increase.

Further, by heating with the lid covered, it is possible to reduce the condensation of moisture evaporated from the foodstuffs inside the distribution vehicle, and to reduce the splashing of oil and the inside of the distribution vehicle.
If the food stored in the hotel pan does not contain moisture (baked goods, fries, etc.), the temperature of the core of the hotel pan itself will increase by 10-15 ° C after the inverter output stops, so the food It is desirable to correct the set heating temperature according to the type of cooking, the cooking method, and the like. This is effective in preventing the burning of food ingredients and the deterioration of the taste (hard, crispy, etc.).

FIG. 7 is a measurement example showing the relationship between the temperature and the heating time of the hotel pan electromagnetic induction heating device according to this embodiment.
FIG. 7 shows the temperature of each part when 2 liters of water is put into the hotel pan 55, heated to 85 ° C., and kept at 75 ° C. ± 1 ° C. In FIG. Show.

With this configuration, in the present embodiment, the hotel pan is directly heated by the inverter and the heating coil. Therefore, the apparatus can be simplified and reduced in size, and sufficient thermal power for reheating can be obtained.
In addition, by preparing multiple sets of inverters, heating coils and temperature sensors for measuring the core temperature of ingredients, the output is controlled by each inverter unit while measuring the core temperature of ingredients with the temperature sensor, and heated to the appropriate temperature. Is possible.

Although this apparatus can be installed and used, it can be effectively used as a conveying means by attaching a caster to form a trolley.
That is, when there is no power source in the cafeteria, reheating is performed at a place where the power can be taken, and after the heating is finished, it is directly transferred to the cafeteria and served at a place close to the eater, thereby enabling proper temperature distribution.
At this time, if it is a structure that can store fixtures such as tableware and a ladle in the distribution car, the convenience can be further improved.

Moreover, when loading and unloading hotel pans, it can also be used as a transport means between a kitchen or pantry or the like and a transport vehicle from the central kitchen. If necessary, it can be carried on a transport vehicle as it is.
Furthermore, in this embodiment, by having a cooling function, it becomes possible to keep food in a chilled temperature zone until heating is started, and safety is improved, and an appropriate temperature (75 ° C. or higher) is provided inside the distribution car. ), The labor of replacing the hotel bread from the refrigerator or other storage can be saved, so labor can be saved.

  In addition, by providing a timer function in the control device, it becomes possible to automatically start heating the hotel pan that is kept cold inside the distribution vehicle at a preset time, thereby further enhancing convenience.

  As described above, the hotel pan electromagnetic induction heating device according to the present invention is extremely useful as an electromagnetic induction heating device that heats and keeps food.

It is a front schematic diagram of a hotel pan electromagnetic induction heating device concerning this embodiment. It is a figure which shows the general view of the electromagnetic induction heating housing | casing which concerns on this embodiment. It is the sectional view on the AA line of FIG. 2 of the electromagnetic induction heating housing | casing guided to the guide rail. FIG. 3 is a sectional view taken along line B-B shown in FIG. 2. It is a side view which shows the side of the storage box which concerns on this embodiment. It is a block diagram which controls heating and cold preservation in this embodiment. It is a measurement example which shows the relationship between the temperature of the hotel pan electromagnetic induction heating apparatus which concerns on this embodiment, and heating time.

Explanation of symbols

2 Electromagnetic induction heating case 4, 55, 56, 58 Hotel pan 6 Controller 8 Storage box 10 Hotel pan electromagnetic induction heating device 12 Front door 14, 16 Guide rail 21 Case 22 First heating coil 22
23 Mounting base 24 Second heating coil 26 Third heating coil 28 First support plate 30 Second support plate 32 Top plate 42 Cooling device 46 Controller 48 having timer function First inverter 49 Second inverter 52 54 temperature sensor

Claims (5)

An electromagnetic induction heating housing having a heating coil inside, a hotel pan of a heated object, a controller for controlling at least the high frequency inverter, and a storage box for storing these,
The electromagnetic induction heating case is provided in a shelf shape in the storage box, and the hotel pan is provided corresponding to the electromagnetic induction heating case,
A hotel pan electromagnetic induction heating device for heating the hotel bread itself by electromagnetic induction heating and heating food contained in the hotel pan.   2. The hotel pan electromagnetic induction heating device according to claim 1, wherein the storage box includes a cooling device that drives a radiator and a cooler, and the inside of the storage box can be cooled and kept cool.   The hotel pan electromagnetic induction heating device according to claim 1 or 2, wherein the storage box includes a caster and can be used as a distribution vehicle having either a cold insulation function and / or a thermal insulation function.   2. The hotel pan according to claim 1, wherein the electromagnetic induction heating housing includes one and a plurality of the heating coils that enable heating of one or a plurality of the hotel pans. Electromagnetic induction heating device. 2. The hotel pan electromagnetic induction heating device according to claim 1, wherein the controller is capable of correcting the heating temperature based on a rise in the core temperature of the food after the output of the high-frequency inverter is stopped.

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