JPH04131074A - Method and device for rapidly changing temperature of food - Google Patents

Abstract

PURPOSE:To forcibly decompose a temperature boundary layer formed around a food, heighten a cooling efficiency, a heating efficiency, etc., and shorten a time for the subject change by spraying hot or cold air on the food carried by a carrying means in a spot-like state in a temperature-controlled atmosphere. CONSTITUTION:The objective changing treatment is performed with a device comprising a carrying means (carrying conveyor) 1 for carrying 8 food, a temperature-controlled chamber 2 disposed in the intermediate position of the carrying means 1 and used for preliminarily heating or cooling the food, a spraying means (spray nozzle) 3 for spraying hot or cold air on the food in a spot-like state, and an air-sucking means (e.g. sucking pipe) 4 for recovering the sprayed hot air, etc., from a place around the sprayer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for rapidly changing the temperature of foods such as seafood paste products for rapidly heating or cooling (including freezing).

(Prior Art) Conventionally, methods for cooling fish paste products such as tempura that have been heated in a fryer etc. include a ventilation cooling method using normal temperature air, a forced cooling method using chilled air, and a tunnel freezer method. Are known.

(Problems to be Solved by the Invention) However, the conventional cooling system has the following problems.

That is, in the ventilation cooling method, the initial cost and running cost are low because a cooling device is not required, but the cooling time is long and the chances of secondary contamination due to ventilation are increased.

In addition, in the forced cooling method, one food item is cooled by circulating cold air of about 10°C in a temperature-controlled room, but even if the temperature in the temperature-controlled room is 10°C, the temperature in the temperature-controlled room is about 80°C. around foods that have been heated to high temperatures.
As shown by the isothermal curve in FIG. 3, a high-temperature boundary layer is formed, and as a result, this temperature boundary layer is maintained even when there is ventilation, resulting in extremely poor cooling efficiency for the food.

In addition, in the tunnel freezer method, for example, food passing through the tunnel freezer is rapidly cooled by applying low-temperature cold air of about -20°C for a short time, but in this case as well, the forced cooling method described above is used. In addition to the same problems as in the case of , there is also the problem that the cooling range is wide (which increases the initial cost and running cost).

Furthermore, the tunnel freezer method is suitable for cooling only foods of the same standard, but when cooling multiple foods of different sizes at the same time, the cooling effect differs depending on the size of the food, so it is not suitable for high-mix, low-volume production. There is a problem of lack of time.

Incidentally, the same problem as above occurs when food is frozen or heat-treated.

The present invention was made to solve the above-mentioned conventional problems, and its purpose is to shorten processing time and reduce costs by increasing cooling (including freezing) or heating efficiency. An object of the present invention is to provide a method and device for rapidly changing the temperature of food, which can reduce the temperature of foods.

(Means for solving Section 2) As a means for achieving the above object, Claim 1 of the present invention
In the described method for rapidly changing the temperature of food, the temperature boundary layer formed around the food is forcibly destroyed by spraying hot or cold air spot-on in a temperature-controlled atmosphere onto the food being transported by a transport means. I tried to let them do it.

Furthermore, in the method for rapidly changing the temperature of food according to claim 2 of the present invention, in the method for rapidly changing the temperature of food according to claim 1, the hot air or cold air that is injected is collected in spots near the injection part and used for circulation. I decided to do so.

Furthermore, in the food temperature rapid change device according to claim 3 of the present invention, there is provided a transport means for transporting the food, a temperature control chamber provided in the middle of the transport means for preheating or precooling the food, and a temperature control chamber provided in the temperature control chamber for preheating or precooling the food. The present invention has a structure including a suction means for spraying hot air or cold air spot-wise onto the food, and a suction means for collecting the sprayed hot air or cold air near the spray part.

(Function) In the method for rapidly changing the temperature of food according to claim 1 of the present invention, when the food being transported by the transport means passes through a temperature-controlled atmosphere, hot air or cold air is sprayed in spots, thereby The thermal boundary layer that forms around the food is forced to break, allowing hot or cold air to directly and efficiently contact the surface of the food.

Therefore, cooling (including freezing) or heating efficiency is increased, and processing time and costs can be reduced.

Further, in the method for rapidly changing the temperature of food according to claim 2 of the present invention, the hot air or cold air injected as described above is collected in spots near the injection part, and the residual heat is recycled and used.

Therefore, the cost of producing hot air or cold air is reduced.

Furthermore, the food temperature rapid change device according to claim 3 of the present invention provides the same functions and effects as the inventions according to claims 1 and 2.

(Example) Hereinafter, an example of the method and apparatus of the present invention will be described in detail based on the drawings.

First, the configuration of the embodiment will be explained. In this embodiment, a case will be described in which tempura that has been heated in a fryer is continuously cooled.

As shown in FIG. 1, the food temperature rapid change device of this embodiment is mainly equipped with a conveyor 1, a ventilation cooling chamber 2, an injection nozzle 3, and a suction vibrator 4.

The conveyor 1 constitutes a conveying means for conveying the tempura A that has been heated in a fryer outside the area, and continuously conveys the tempura A with predetermined intervals placed on the conveyor belt O. Transport will be carried out.

The ventilation cooling chamber 2 constitutes a temperature control chamber for pre-cooling the tempura A, and is provided in a tunnel shape so as to surround the outer periphery of the conveyor 1.

Tempura A is pre-cooled by ventilation from a blower outside the area.

The injection vibe 3 is provided in the ventilation cooling chamber 2,
It constitutes a suction means that sprays cold air spot-wise onto the tempura A being conveyed on the conveyor belt 10, and is provided with its injection port 30 close to the upper surface of the tempura.

Previous: The self-suction vibrator 4 constitutes a suction means that collects the cold air injected from the jetting vibrator 3 in spots in the vicinity of the jetting part. The suction port 40 is provided in a surrounding manner.
The opening is wide and wide at the end.

The injection vibrator 3 is connected to the outlet of the cooler 5, and the suction vibrator 4 is connected to the suction outlet of the cooler 5, so that the injected cold air is recovered and used for circulation. ing. In this embodiment, the air outlet temperature of the cooler 5 is set to -20°C.

Next, the operation of the embodiment will be explained.

Since the food temperature rapid change device of this embodiment is configured as described above, the tempura A transported by the transport conveyor 1 is sent to a floor outside the area when passing through the ventilation cooling room 2. While being cooled by palm-temperature air, it is rapidly cooled in spots by -20° C. cold air jetted from the jetting port 30 of the jetting vibrator 3. That is, the cold air sprayed spot-wise from the spray nozzle 30 of the spray vibrator 3 forcibly destroys the temperature boundary layer formed around the tempura A due to its spray force, and as a result, -20°C cold air is generated. is brought into direct and efficient contact with the surface of Tempura A for rapid cooling.

Therefore, by spot injection of cold air, the cooling efficiency is higher than in the case of cooling the entire body, and the forced destruction of the temperature boundary layer increases the heat transfer efficiency of cooling to Tempura A, reducing the cooling process time. This makes it possible to reduce cooling costs.

In addition, the cold air (for example, cold air of about -10°C) that is injected from the injection vibrator 3 and has undergone heat exchange by cooling the tempura A is passed through a suction pipe provided so as to surround the outer periphery of the injection port 30. The residual heat (approximately -10° C.) is collected by spot suction from the suction port 40 of the cooling device 5, and the residual heat (approximately -10° C.) is circulated and used as intake air of the cooler 5.

Therefore, the initial cost of cooling 1i15 can be reduced.

As described above, the method and apparatus for rapidly changing the temperature of food according to this embodiment can shorten processing time and reduce costs.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are design changes or the like within the scope of the invention, the present invention include.

For example, in the embodiment, a case where food is subjected to cooling treatment is taken as an example, but it goes without saying that the present invention can also be applied to cases where food is subjected to freezing or heat treatment.

Furthermore, in the embodiment, a ventilation cooling room in which room-temperature air is simply ventilated through the floor is used as the temperature control room, but cold air generated by forced cooling means may also be used.

Further, the arrangement relationship and the number of the injection ports in the suction means and the suction ports in the suction means are also arbitrary.

Note that FIGS. 2(a) to 2(c) show examples of arrangement patterns, in which the diagonally shaded portions are suction ports and the other portions are injection ports.

Further, for example, the arrangement of the jet ports and suction ports shown in FIGS. 2(a) and 2(b) may be reversed so that the cold air injected from the outer circumferential side is sucked at the center side.

Further, the shapes of the injection port and the suction port are arbitrary, and in addition to being circular, they can also be shaped into a rectangular seven-ring shape, a slit shape, or the like.

(Effects of the Invention) As explained above, in the method for rapidly changing the temperature of food according to claim 1 of the present invention, hot air or cold air is sprayed in spots when passing through a temperature-controlled atmosphere. The thermal boundary layer that forms around the food can be forced to break and the hot or cold air can be brought into direct and efficient contact with the food surface, resulting in higher cooling (including freezing) or heating efficiency. The effects of shortening processing time and reducing costs can be obtained.

Furthermore, even when cooling multiple foods of different sizes (including freezing) at the same time, by spraying cold air in spots, cooling (including freezing) can be done according to the size of the food.
Differences in effects are less likely to occur, and this has the effect of enabling high-mix, low-volume production.

In addition, in the method for rapidly changing the temperature of food according to claim 2 of the present invention, the hot air or cold air injected as described above is collected in spots near the injection part, and the residual heat is recycled and used. Alternatively, an effect can be obtained in that the manufacturing cost of cold air can be reduced.

In addition, the food temperature rapid change device according to claim 3 of the present invention has the same effect and function as the invention according to claims 1 and 2.
be effective.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a rapid temperature change device for food according to an embodiment of the present invention, Figs. 2 (A) to (C) are sections showing the arrangement pattern of injection ports and suction ports, and Fig. 3 is a temperature boundary. FIG. 3 is a plan view showing the layers. 1: Transport conveyor (transport means) 2: Ventilation cooling room (temperature control room) 3: Injection nozzle (suction means) 4: Suction pipe (suction means) A: Tempura (food) Patent applicant Yanagya Co., Ltd. Figure 3 Figure 2 (A) (C) (B)! (Transportation means) Ifil' room (Temperature control room) Zuru (Suction means) [Eve (Suction means), Ra (Food)

Claims (1)

[Claims] 1) Forcibly destroying the temperature boundary layer formed around the food by spraying hot or cold air in a temperature-controlled atmosphere in spots on the food being transported by the transport means. A method for rapidly changing the temperature of food. 2) The method for rapidly changing the temperature of food according to claim 1, characterized in that the injected hot air or cold air is collected in spots in the vicinity of the injection part and recycled for use. 3) A transport means for transporting food, a temperature control chamber provided in the middle of the transport means for preheating or precooling the food, and a temperature control chamber provided within the temperature control room for spraying hot or cold air onto the food in spots. 1. An apparatus for rapidly changing the temperature of food, characterized in that it is equipped with a suction means for collecting the jetted hot air or cold air in the vicinity of the jetting section.