JPS5927564B2 - automatic fryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic fryer, and particularly to an automatic fryer, which has an external heating section, divides the inside of the frying pan into a plurality of temperature ranges, and supplies frying oil to the outside through an oil pipe equipped with an oil pump. This invention relates to an automatic fryer that uses a single heating device in the heating section to improve thermal efficiency in an automatic fryer that circulates between the heating section and the frying pan.

BACKGROUND ART Conventionally, when industrially mass-producing fried products such as tempura, aburaage, ganmodoki, or fried tempura, fried foods are continuously fried using a conveyor-type frying pan.

In the continuous processing of fried foods in such an automatic fryer, in many cases, the heating method is to directly heat a frying pan using a burner, electric heat, or heating medium.

However, in the direct heating method that directly heats the fryer, for example, heating with a gas burner raises the temperature around the automatic fryer to a very high temperature, deteriorating the working environment.

In addition, in the method of heating frying oil by passing a heating medium through a heating tube installed in the oil in the frying pan, the heating tube is built in, so the bottom of the frying pan must be made deeper than necessary, and the depth of the frying oil used The amount becomes extremely large, and a large amount of frying oil becomes oxidized and degraded at the same time, which is undesirable.

Furthermore, in these direct heating methods, the portion where the frying oil comes into contact with the atmosphere and the heating section becomes extremely high temperature, which is undesirable because deterioration is accelerated.

To overcome these drawbacks, external heating methods have also been adopted.

The external heating method improves the working environment by isolating the heating part, and also avoids the need to increase the amount of frying oil used due to the increased capacity of the frying pan due to the built-in heating tube.

However, this external heating method has a problem of a decrease in thermal efficiency, and an increase in the amount of fuel used increases production costs, which is undesirable.

Furthermore, in general, in the frying process of fried foods, it is often necessary to set the temperature of the frying oil to be low at the place where the raw materials for frying are supplied, but high at the place where the frying process ends.

In order to create such a temperature difference in the frying pan, the frying oil heated in the heating section is supplied to the product outlet, and the frying oil whose temperature has dropped during the frying process is placed near the inlet for fried ingredients. A method using a single frying pot in which the water flows back to the heating section through a discharge port, and a method in which the inside of the frying pot is divided into multiple temperature regions, and a heating machine corresponding to each temperature region is installed in the heating section, and each temperature region is A method of heating with an independent circulation system has been proposed.

In the former case, for example, when producing fried tofu, the temperature at the place where fried seeds are added is about 90°C, and at the end of the frying process, it is about 180°C.
It is desirable that the temperature of the frying oil be around 30°F, and in order to create such a large temperature difference, it is necessary to allow an extremely long residence time for the frying oil in the frying pan from the supply port to the discharge port. It is necessary to make the length of the pot extremely long or to reduce the flow rate of the circulating oil.

If the length of the frying pan is made extremely long, the area occupied by the machine will become large, which is undesirable.Also, if the residence time is made extremely long, the difference in the degree of aging of the frying oil will become too large between the supply port and the discharge port. Undesirable.

In addition, in the latter case, the heating section uses multiple heating machines, which reduces the size of the heating machines and reduces thermal efficiency, and it is necessary to independently manage the temperature of multiple circulation systems, making the work more complicated. invite

As a result of intensive studies to improve the shortcomings of these conventional methods, the inventor of the present invention divided the inside of the frying pan into multiple temperature ranges and used a single heating device for the external heating section. ,
This not only improves thermal efficiency, but also makes it possible to effectively adjust the temperature of frying oil in each temperature range.

That is, as shown in FIGS. 1 and 2, for example, the present invention includes conveyors 12 and 13, scraping conveyors 14 and 15, etc., and a partition plate 2 that projects above the oil lifting surface 3.
In an automatic fryer in which a frying pan 1 is divided into a plurality of temperature zones, a supply lower and a discharge port 8 for heated frying oil are provided for each temperature zone, and the fried oil flowing back from the discharge port 8 is connected to a filter section 10. The oil is sent to the heating section 4 by the oil pump 11 through the discharge vibro.

The heating unit 4 consists of a single heating machine, and frying oil heated to a predetermined temperature is supplied to each temperature range through a supply pipe 5 corresponding to each temperature range.

At this time, the flow rate of the frying oil is adjusted to correspond to each temperature range by the flow rate control valve 9 provided in each supply pipe.

When frying oil is supplied to the low temperature region, the flow rate is reduced to maintain the low temperature.

On the other hand, in the high temperature range, the flow rate can be increased to keep the frying oil temperature relatively uniform throughout the high temperature range.

By keeping the temperature in the high-temperature region relatively uniform, the processing time in the high-temperature region can be maintained for a longer period of time compared to the conventional method of gradually creating a temperature gradient using a single-tank frying pot with a single heating section. As a result, fried products with good oil removal can be easily produced.

Furthermore, since the circulating amount of the frying oil used in the low temperature range is small, the aging of the frying oil due to the long residence time in the low temperature range is also kept to a small amount overall.

Therefore, it is possible to obtain the same frying effect with a single heating machine as with the conventional method of dividing the inside of the external heating power fryer into multiple temperature ranges, and furthermore, this conventional method can handle each temperature range. However, in the method of the present invention, the purpose can be achieved by using a single large heating machine, and the thermal efficiency is also lower than that of the conventional method. It is much better than that, and temperature control is also extremely easy.

In the present invention, as shown in FIG. 3, a heat exchanger 30 is used to exchange heat between the low-temperature fried oil flowing back from the outlet 8 in the low-temperature zone 24 and the fried oil supplied to the low-temperature zone. is also possible.

This is an effective method when the temperature difference with the high temperature region 25 is large, and can increase the amount of circulation in the low temperature region.

In this case, if necessary, heat exchange may be performed between the fried oil supplied to the low temperature range and the fried oil discharged from the high temperature range.

The heat exchanger 30 is not necessarily required when the temperature difference is small or when it is acceptable to reduce the amount of circulation.

Further, in the present invention, the flow direction of the frying oil in each temperature range, that is, the supply lower and the discharge port 8 of the frying oil can be arbitrarily determined depending on the purpose.

For example, the movement of the fried food may be in the same direction as shown in FIG. 1, or may be in the opposite direction as shown in FIG.

In the case of opposing flows as shown in FIG. 2, it is preferable to provide the conveyor 18 with a mold 19 to store the seeds and actively transport them.

When a mold is not used, the conveyor 18 or the presser conveyor 13 shown in FIG. 1 may be provided with protrusions for feeding the seeds.

The mold or the protrusions cause the fried seeds to move against the flow of the frying oil.

At this time, since the frying oil is stirred, the temperature within the same temperature range becomes relatively uniform, resulting in more favorable results.

Furthermore, in cases where the temperature difference between the high-temperature region and the low-temperature region can be set small, a method of moving the fried food and the frying oil in the same direction as shown in FIG. 1 is also used.

In this case, it is effective to prevent the fried food from stagnation in the frying pan.

Further, the heating section of the present invention may be of an indirect heating type using a heat medium as shown in FIG. 4, or may be of a direct heating type using a burner 29 using a heating furnace 28 as shown in FIG. It's okay.

In the case of the direct heating method shown in FIG. 5, the part of the heating section 46 where the heat of the burner 29 is directly transferred becomes extremely hot, and the oil is easily affected by dissolved oxygen. The indirect heating method shown in FIG. 4, which allows the heating temperature to be moderate, is most preferable.

Here, the fuel burned in the burner 29 may be either gas fuel or liquid fuel.

FIG. 4 shows a method of introducing a heated heat medium into the heating section 4a from the heat medium inlet 26, exchanging heat with frying oil introduced from the oil pipe 23, and discharging the heat medium from the heat medium outlet 27. However, any known heat exchanger can be used depending on its capacity.

As the heat medium, high-pressure steam of 1.5 k, g/crA or higher is most desirable, but any heat medium that can be used for food production may be used.

[Brief explanation of drawings]

FIG. 1 shows an automatic fryer of the present invention, in which numeral 16 indicates the input direction of fried seeds, and numeral 17 indicates a product take-out section. Figure 2 shows the automatic fryer of the present invention, in which 20, 2
Reference numerals 1 and 22 are presser plates that prevent the fried seeds or fried products from falling off the formwork 19. FIG. 3 shows a mode of heat exchange between the heated frying oil supplied to the low temperature region of the present invention and the recirculated frying oil discharged. 4 and 5 show embodiments of the external heating machine used in the present invention, FIG. 4 is an indirect heating machine, and FIG. 5 is a direct heating machine.

Claims (1)

[Claims] 1. In an automatic fryer that has an external heating section, the inside of the frying pan is divided into a plurality of temperature ranges, and frying oil circulates between the heating section and the frying pan via an oil pipe equipped with an oil pump. An automatic fryer characterized in that the heating section consists of a single heating machine.