JPS5913207B2 - Automatic fryer heating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating mechanism for an automatic fryer, and more particularly to a heating mechanism for an automatic fryer, which has an external heating section, divides a frying pan into a plurality of temperature ranges, and feeds frying oil through an oil pipe equipped with an oil pump. In an automatic fryer in which oil circulates between a heating section and a frying pan, and the heating section consists of a single heating machine, at least a portion of the frying oil circulating from a high temperature area is supplied to the next temperature area, and , relates to a heating mechanism for an automatic fryer in which at least a portion of the frying oil recirculated from each temperature range is supplied to the next temperature range lower than the temperature range.

BACKGROUND ART Conventionally, when industrially mass-producing fried products such as tempura, aburaage, ganmodoki, or fried tempura, fried foods are continuously processed using a conveyor type deep fryer, that is, an automatic fryer.

In 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.

The direct heating method has the advantage that the temperature distribution within the frying pan can be easily adjusted because the amount of heat in the heating place can be adjusted arbitrarily.

However, while it is easy to adjust the temperature distribution, direct heating with a gas burner, for example, raises the ambient temperature of 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 frying oil that is in contact with the atmosphere becomes partially high in temperature at the part where it comes into contact with the heating section, which is undesirable because deterioration is accelerated.

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

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

However, even in this external heating method, there is a problem of a decrease in thermal efficiency, and an increase in fuel consumption increases production costs, which is undesirable.

Furthermore, in general, in the frying process of fried foods, the temperature of the frying oil is often set to be low at the place where the fried ingredients are supplied and high at the place where the frying process is completed.

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 frying hole. A method using a single frying pot in which the water flows back to the heating section through a discharge port, and the inside of the frying pot is divided into multiple temperature regions, and the heating section is equipped with a heating machine corresponding to each temperature region, and each temperature region is independently controlled. A method of heating using a circulating system has been proposed.

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

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, which is not desirable. do not have.

In addition, in the latter case, the heating section uses multiple heating machines, which reduces the size of the heating machines, reduces thermal efficiency, and requires independent temperature control of multiple circulation systems, making the work more complicated. invite.

The inventor of the present invention conducted extensive research to eliminate the drawbacks of these conventional methods, and found that by dividing the inside of the frying pan into multiple temperature ranges and using a single heating device for the heating section for external heating, ,
This not only improves thermal efficiency, but also makes it possible to effectively adjust the frying oil temperature in each temperature range.

That is, the present invention includes, for example, conveyors 12 and 18, a presser conveyor 13, scraping conveyors 14 and 15, etc. as shown in FIGS. 1 and 2, and a partition plate 2 that projects above the oil lifting surface 3. In an automatic fryer consisting of a frying pan 1 divided into multiple temperature ranges, a heating oil supply port 1 is provided for each temperature range.
and a discharge port 8 are provided, and the fried oil heated by the heating section 4 is supplied to the high temperature region 25 through a supply pipe 5a equipped with a flow rate control valve 9.

Fried food is heated in a high temperature range, and the fried oil, which has been cooled somewhat, flows back through the discharge port 8 in the high temperature range through the discharge vibro, passes through the filtration section 10, and is passed through the oil feed pump 11 into the oil feed pipe 23.
and returns to the heating section 4 again.

At this time, a part of the somewhat cooled fried oil flowing back from the high temperature area 25 flows through the low temperature area supply pipe 5b, which is equipped with the oil feed pump 11 and the flow control valve 9 connected to the discharge vibro in the high temperature area 25. It is supplied to the low temperature area 24 through the air.

The temperature of the low temperature region 24 is adjusted by controlling the flow rate by opening and closing a flow rate control valve 9 provided on the supply pipe 5b or by controlling the rotational speed of the oil pump 11.

The fried oil subjected to the frying process in the low temperature area 24 is further lowered in temperature and passes through the discharge vibro from the discharge port 8 to the filtration section 10.
The filtration part 10 consists of a filter using a filter material such as a wire mesh or filter cloth, and filters corresponding to each temperature range may be provided separately. Alternatively, a single filter may be applied to the entire temperature range.

One of the features of the present invention is that by increasing the flow rate in the high temperature range, it is possible to achieve relatively uniform temperature control over the entire high temperature range, even though it is a single heating section. It's about getting.

Moreover, even if the flow rate in the high temperature range is increased in order to maintain a uniform temperature in the high temperature range, the supply in the low temperature range is performed by an independent oil feed pump or flow control valve, so the temperature can be controlled independently. will be held.

Therefore, compared to the conventional method in which frying oil is heated in a single heating section and circulated through a single-tank frying pan, the temperature is controlled by gradually creating a temperature gradient from a high-temperature area to a low-temperature area. The heating mechanism of the invention can make the temperature difference between the high temperature region and the low temperature region clear, and can further lengthen the process in the high temperature region.

As a result, compared to conventional methods where the maximum temperature retention time in the high-temperature area was short, making it difficult to obtain fried products that were crispy and free of oil, this new model allows you to adjust the retention time in the high-temperature area as you like. The product according to the invention is oil-free.

On the other hand, in the low temperature range, the frying oil used is somewhat cooled due to heat transfer to the fried food in the high temperature range, and the amount of frying oil supplied is reduced according to the set temperature in the low temperature range. The temperature of the frying oil is cooled to a specified temperature in a relatively short process length.
Therefore, even if the time required for the frying oil to reach the target low temperature from a predetermined high temperature is the same, in the present invention, most of the time is compressed to the low temperature range, and the oxidation of the frying oil that occurs over time. The effect of inferiority on fried products is relatively small.

Furthermore, in the present invention, the temperature of the fried oil supplied to the low-temperature region can be further lowered by adding replenishment of the fried oil carried away by the fried products to the supply pipe to the low-temperature region, particularly before the oil feed pump of the pipe. Moreover, it is possible to supply frying oil with a relatively uniform temperature distribution.Thus, the present invention is a method that divides the inside of a frying pan into a plurality of temperature regions using a conventional external heating method and is equipped with a heating machine corresponding to each temperature region. The same effect can be obtained as in the conventional method using multiple small heating devices, and since the heating section is removed from a single heating device, the heating device can be made larger, resulting in superior thermal efficiency compared to the conventional method using multiple small heating devices. In the invention, as shown in FIG. 3, an intermediate temperature 24' can be provided between the high temperature region 25 and the low temperature region 24.

The fried oil recirculated from the high temperature zone 25 and the intermediate temperature zone 24' is supplied to the intermediate temperature zone 24' and the low temperature zone 24 through supply pipes 5b' and 5b, respectively, which are equipped with an oil feed pump 11 and a flow rate control valve 9. circulate.

If a finer temperature range is required, the intermediate temperature range can be further divided into multiple stages.In addition, in the present invention, depending on the purpose, the flow direction of the frying oil in each temperature range, That is, the supply lower and the outlet 8 for frying oil can be set arbitrarily; for example, they can be in the same direction as the movement of the fried food as shown in FIG. 1, or they can be opposite to each other as shown in FIG. There may be.

In the case of opposing flows as shown in FIG. 2, it is preferable to provide a form frame 19 on the conveyor 18 to store and actively convey the seeds.0 If the form frame 19 is not used, the conveyor 18 The presser conveyor 13 shown in FIG. 1 or the like may be provided with a protrusion for feeding the seeds.

The frying oil moves against the flow of the frying oil due to the formwork or protrusions. At this time, the frying oil is stirred, so the temperature within each temperature range is relatively uniform, resulting in more favorable results.
In cases where the temperature difference between the high temperature range and the low temperature range can be set small, a method of moving the fried food and frying oil in the same direction as shown in Figure 1 is also used. This has the advantage of avoiding stagnation of fried foods.

The heating section of the present invention may be of an indirect type using a heat medium as shown in FIG. 4, or may be of a type directly heated by 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 frying oil in the heating section 4b where the heat of the burner 29 is directly transferred becomes extremely high in parts and is easily affected by dissolved oxygen. The indirect heating method shown in FIG. 4 is the most preferable because it can maintain a gentle heating temperature, and the fuel combusted in the burner 29 can be either gaseous fuel or liquid fuel.
FIG. 4 shows a method of introducing a heated heat medium from a heat medium population 26 into the heating section 4a, exchanging heat with frying oil introduced from an oil pipe 23, and discharging the heat medium from a heat medium outlet 27. However, any known heat exchanger can be used depending on its capacity.

As the heat medium, high pressure steam of 15 kg/cIrL or higher is most desirable, but any heat medium that can be used for food may be used.

[Brief explanation of the drawing]

FIG. 1 shows the heating mechanism of the automatic fryer of the present invention, in which 16 indicates the direction in which the fried seeds are fed, and 17 indicates the product take-out section. Figure 2 shows the heating mechanism of the automatic fryer of the present invention.
This is a presser plate that prevents it from falling off. FIG. 3 shows the heating mechanism of the automatic fryer of the present invention, which has three temperature ranges. 4 and 5 show embodiments of the heating machine used in the present invention, which are an indirect heating machine and a direct heating machine, respectively.

Claims (1)

[Claims] 1. Has an external heating section, divides the inside of the frying pan into a plurality of temperature ranges, and circulates frying oil between the heating section and the frying pan via an oil pipe equipped with an oil pump. In addition, in an automatic fryer in which the heating section is composed of a single heating machine, at least a portion of the fried oil recirculated from the high temperature range is supplied to the next temperature range, and the recirculated fried oil from each temperature range is A heating mechanism for an automatic fryer, characterized in that at least a portion of the heating mechanism is supplied to a next temperature range lower than the first temperature range. 2. The heating mechanism for an automatic fryer according to claim 1, wherein a plurality of temperature ranges of the fryer are divided by a partition plate located higher than the oil level. 3. In order to supply the recycled oil from each temperature range to the next temperature range, an oil feed pump and a flow rate control valve are installed for each supply pipe connected to the discharge pipe of each temperature range to the next temperature range. A heating mechanism for an automatic fryer according to claim 1, which is adapted to respond to temperature. 4. When supplying the fried oil circulating from each temperature range to the next temperature range, an oil feed pump is provided for each supply pipe to the next temperature range connected to the discharge pipe of each temperature range to correspond to the temperature of the next temperature range. A heating mechanism for an automatic fryer according to claim 1, wherein the rotation speed of the oil pump is adjusted to adjust the flow rate of the oil for frying. 2. A heating mechanism for an automatic fryer according to claim 1, further comprising a supply port and a discharge port for frying oil so as to face the direction of movement of the fryer. 6. A heating mechanism for an automatic fryer according to claim 1, wherein the frying oil supply and outlet ports are installed so that the flow direction of the frying oil in each temperature range in the frying pan is the same as the moving direction of the fried food. 7. The heating mechanism for an automatic fryer according to claim 1, wherein the heating device comprises a heat exchanger that uses high-pressure steam of 15 kIi/d or more as a heat source.