JP2706854B2 - Continuous decompression fryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous vacuum fryer for continuously frying raw materials under reduced pressure.

[0002]

2. Description of the Related Art Conventionally, as a decompression fryer,
The fry material is put into a fry basket, and the double doors at the entrance and the exit of the decompression fry chamber are sequentially opened and closed to fry the fry material of the fry basket in the decompression fry chamber. Things are provided.

As another prior art, Japanese Patent Application Laid-Open No. 62-262954 discloses a method in which a raw material is supplied into oil by a screw and frying is performed while transferring the raw material by a screw conveyor in oil under reduced pressure. I have.

[0004]

[Problems to be solved by the present invention]

In the technique disclosed in Japanese Patent Application Laid-Open No. 61-232819, since the frying process is performed in a batch system, the processing capacity is limited. There is a problem that opening and closing the door is a major obstacle to improving the processing capacity. On the other hand, JP
Japanese Patent Publication No. 262951 describes that the entire oil fryer is covered with a container that can withstand reduced pressure, and the pressure is reduced by a vacuum pump. However, the specific configuration is not described. In general,
It is difficult to make the structure for supplying the raw material with a screw airtight, and it is also presumed that the raw material adheres to the screw and it is impossible to supply the raw material reliably.

As a continuous vacuum fryer for solving the problems of the prior art, the inventors of the present invention have adopted a hermetic shutter in a vacuum fryer for carrying in and out the raw material while maintaining the reduced pressure in the reduced pressure fry chamber and frying under reduced pressure. A raw material charging section, a cylinder-type extruder disposed below the raw material charging section for transferring the raw material to the decompression fry chamber, a pressure shut-off valve provided in a conveying path of the cylindrical extruder, An application has been filed for a continuous depressurizing fryer comprising a conveying means for conveying raw materials in oil in a fry chamber (Japanese Patent Application No. Hei 1-1).
No. 88014).

However, depending on the type of raw material or the type of pretreatment such as immersion in a sugar solution, the raw material is placed on the extrusion surface of a cylinder type extrusion device in a continuous vacuum fryer for feeding the raw material to a vacuum fry chamber by a cylinder type extrusion device. May be attached. Once the adhesion starts, the adhesion tends to occur more concentrated on that portion, which not only causes a failure but also has a problem in securing the quantitativeness of the raw material and the predetermined quality of the product.

[0008] It is an object of the present invention to provide a continuous decompression fryer which can effectively prevent the material from adhering to the extruding surface of the above-mentioned cylinder type extruder.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an extruder arranged below a raw material inlet for transferring a raw material to a decompression fry chamber, a raw material inlet and a product outlet having a pressure cut-off mechanism, and an extruder for the extruder. The raw material is loaded and unloaded while the vacuum chamber is kept at reduced pressure, and a frying process is performed under reduced pressure. The vacuum chamber has a pressure shut-off valve provided in the transport path and a transport means for transporting the raw material in oil in the vacuum chamber. In the decompression fryer,
A continuous depressurizing fryer characterized in that a means for removing deposits on the extruded surface of the extruder is provided.

[0010]

According to the present invention, the raw material is supplied from the raw material loading section while maintaining the reduced pressure in the reduced pressure fry chamber, and subsequently, the raw material transferred from the raw material loading section to the reduced pressure fry chamber by the cylinder type extrusion device. Extrude. Thereafter, the extruded surface of the cylinder-type extruder is flushed with spray oil or scraped by a scraping mechanism, and then the cylinder-type extruder is returned to its original position, and then the pressure shut-off valve is closed,
The raw material supply operation is performed again from the raw material introduction section.

[0011]

According to the present invention, there is no possibility that the raw material adheres to the wall of the raw material charging section and the extruding surface of the cylinder type extruder to cause clogging of the raw material. It is possible to provide a continuous decompression fryer which eliminates waste and has few troubles.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the continuous-type decompression fryer includes a decompression fry chamber 1 and a decompression fry chamber 1 for performing decompression fry processing.
A raw material supply device 3 for supplying a raw material to the raw material supply device 2 and a product cooling chamber 4 for cooling the reduced-pressure fried products.

As shown in FIG. 2, the raw material supply device 3 has a raw material stock tank 31 and a conveyor 32 for transferring the raw material disposed below the raw material stock tank 31. The raw material discharged from the lower end of the raw material stock tank 31 is transferred from the conveyor 32 to the terminal portion 33, from which the raw material is dropped and supplied to the lower raw material input device 2.

As shown in FIG. 2, the raw material charging device 2 further includes a raw material hopper 21 provided below the end portion 33 of the conveyor 32 for receiving a raw material, and a rotating hopper provided below the raw material hopper 21. It has a valve 22 and a horizontal tube portion 23 provided below the rotary valve 22 for receiving a raw material supplied from the rotary valve 22.

The rotary valve 22 has a valve body 25. The valve body 25 is provided with depressions 24a and 24b that do not allow the upstream side (normal pressure state) and the downstream side (decompression state) of the raw material charging device 2 to communicate with each other. . Recesses 24a, 2
4b collectively drops a fixed amount of raw materials supplied in a conveyed manner by the conveyor 32 onto the horizontal tube portion 23.

The horizontal pipe section 23 communicates with the vacuum fry chamber 1. A loading bar 26 that reciprocates inside the horizontal tube portion 23 is incorporated in the horizontal tube portion 23. The loading bar 26 is attached to a hydraulic cylinder 27 serving as a driving source, and a pushing surface 28 at a tip portion of the loading bar 26 is closer to the front side than the drop position of the raw material from the rotary valve 22 by the hydraulic cylinder 27 (the hydraulic cylinder 27 side). Is moved back and forth until it reaches the inlet 10 of the decompression fry chamber.

The raw material supplied through the hopper 21 is supplied to the recess 24 a or 24
b. Thereafter, the valve body 25 is turned over, and the raw material that has been in the recess 24 a or 24 b is dropped into the horizontal pipe portion 23. In this case, the recesses 24a and 24b do not communicate between the upstream side of the raw material charging device 2, that is, the hopper side (normal pressure state) and the downstream side, that is, the horizontal pipe section side (depressurized state). The raw material can be supplied while maintaining the reduced pressure.

Subsequently, the loading bar 2 is moved to a position where the pushing surface 28 at the tip portion reaches the loading port 10 of the decompression fry chamber 1.
6 is moved, and the raw material is charged into the reduced pressure fry chamber 1.

The number of recesses provided in the valve body 25 can be made three or more by reducing the angular dimensions of the hopper 21 and the inlet (falling port) in the rotation direction of the valve body 25. .

The decompression fry chamber 1 has a net conveyor 42 and a leak valve 41 for transporting raw materials. As shown in FIG. 3, the net conveyor 42 includes a net-shaped endless belt 5.
0 is provided with a plurality of partition nets 52 extending substantially outward. The width of the decompression fry chamber 1 in the direction orthogonal to the transport direction of the net conveyor 42 is substantially equal to the width of the endless belt 50 and the division net 52. Accordingly, a plurality of compartments 54 that open outward are formed in the net conveyor 42, and the raw materials are charged therein. The inclination angle of the division net 52 with respect to the endless belt 50 will be described later.

As shown in FIG. 4, the net conveyor 42 is guided by three guide pulleys 60, 61 and 62, and is driven intermittently by a drive pulley 64.
The transport path of the net conveyor 42 has a substantially parallelogram shape when viewed from the side, and the portion corresponding to the bottom surface is in the oil, and the raw material input from the raw material input device 2 is fried here. . The net conveyor 42 is, for example, 10
It moves intermittently by the width in the transport direction of the net conveyor 42 in the compartment 54 at a rate of once every second to 10 minutes.

As shown in FIG. 2, the trajectory of the leading end of the partitioning net 52 is
It is preferable that the first and second extruding surfaces 28 substantially coincide with each other. Thus, the tip end of the partitioning net 52 after scraping the raw material can scrape the pushing surface 28 of the throwing bar 26, and effectively prevent the raw material from adhering to the pushing surface 28.

As a means for preventing the material from adhering near the inlet, an oil supply port 502 for showering and pouring oil in the vicinity of the extruding surface 28 in the reduced pressure fry chamber 1 can be provided. Further, by providing an oil supply port 504 for flowing oil in a wall portion above the input port 10 of the reduced-pressure fry chamber 1, it is possible to drain off the raw material attached near the input port 10.

Further, as shown in FIG. 5, the endless belt 50 of the net conveyor 42 has a height of 40 to 6 with respect to the horizontal above the discharge slope 106 of the decompression fry chamber 1.
It runs at an angle of 0 ° in parallel.

In this state, the endless belt 50 is fixed by the fixing member 108 so that the angle formed with respect to the horizontal line H, that is, the discharge inclination angle α of the division net is 40 to 100 °, preferably 80 to 90 °. Attached to

The first half of the raw material conveying path of the reduced pressure fry chamber 1;
That is, above the raw material input side of the bottom portion of the parallelogram-shaped transport path of the net conveyor 42, FIGS.
As shown in the figure, a large number of oil supply units 500 for supplying oil at a predetermined temperature in a shower state are provided.

As a result, in the initial stage of the reduced pressure frying process, a predetermined amount of oil having a sufficient calorific value for the raw material can be supplied to the raw material. Further, the raw materials adhered to the endless belt 50 in the initial stage of the reduced pressure frying process can be removed.

Each of the oil supply units 500 has an oil amount adjusting valve (not shown).
Of the raw material transport path in the transport direction, that is, the raw material compartment 5
It is configured such that the supply amount of oil per hour can be controlled according to the reduced-pressure frying time of the raw material in 4. Therefore, it is possible to efficiently supply a desired amount of heat to the raw material in the raw material compartment 54 according to the reduced-pressure frying time.

An oil outlet 107 composed of a number of small holes is provided on the bottom surface of the reduced pressure fry chamber 1 at a position substantially below each of the oil supply units 500. As a result, the oil poured down like a shower from above flows almost vertically from the oil level to the bottom surface of the decompression fry chamber 1. As a result, most of the oil comes into contact with the raw material that is substantially diffused over the entire oil surface, and it is possible to effectively prevent frying unevenness and supply the calorie of the oil to the raw material without waste. And the heat supply efficiency, that is, the reduced-pressure frying processing efficiency is improved.

As shown in FIG. 1, the oil that has flowed out of the oil extracting unit 107 is provided with a first oil lubrication pump 601, a strainer 602, and a centrifugal separator 60 for removing water from the oil.
3. The oil is supplied to the oil supply unit 500 again through the oil circulation path 600 having the oil storage tank 604 and the second oil circulation pump 605.

In the oil circulation path 600, first, raw material scum and the like are removed from the oil by the strainer 602. Next, the oil is sent to a centrifugal separator 603 for removing moisture in the oil, and subjected to centrifugal separation. As a result, the oil and the water scattered in the oil are separated into an oil layer and a water layer, respectively, the water layer portion is discharged, and the water scattered in the oil is sufficiently removed.

As shown in FIG. 6, the oil storage tank 604 is connected to the oil circulation path 600 through pressure cutoff valves 610 and 611.
Is in communication with The oil storage tank 604 is in communication with the first vacuum pump 701. Thereby, for example, when cleaning the inside of the decompression fry chamber 1, the pressure shutoff valves 610, 61
1 is closed, and air remaining in the oil storage tank is sufficiently removed by the first vacuum pump 701, so that oxidation of the stored oil can be effectively prevented.

Further, a jacket 711 is provided on the wall of the oil storage tank 604, and a sheath heater 712 is provided inside the jacket, for heating the oil to a required temperature. Further, an agitator 713 is provided in the oil storage tank 604 to make the temperature of the oil uniform.

As shown in FIG. 1, a plurality of the oil storage tanks 604 are provided. Thus, the oil in the vacuum fry chamber 1 can be easily changed depending on the type of the raw material, and the smell of the raw material can be effectively prevented from being transferred to the oil and the smell being transferred to another raw material.

Next, the decompression fry chamber 1 has a vacuum unit 8, which exhausts air and steam generated from the raw material from the decompression fry chamber 1 to reduce the pressure in the decompression fry chamber 1. Maintain the vacuum required for frying.
As shown in FIG. 1, the vacuum unit 8 basically includes a cold trap 801 and a second vacuum pump 802.

A cold trap 801 for bringing a gas into contact with the bottom warm wall surface to condense and remove water in the gas is shown in FIG.
As shown in the figure, the water storage tank 820 has a drainage pipe 813 provided with pressure cutoff valves 811 and 812 on the upstream and downstream sides of the water storage tank 820, respectively. The temperature of the trap surface 830 is maintained at -20 to 20 ° C, preferably 0 to 10 ° C, by circulating a constant temperature refrigerant inside. In addition, it is desirable that the water storage tank 820 be provided with a pressure adjusting pipe (not shown) that communicates with the outside via a leak valve and a pressure shutoff valve, in that the water can be smoothly discharged. Further, it is desirable that the water storage tank 820 be kept at a predetermined temperature or lower by, for example, covering with a heat insulating material or providing a pipe for circulating a refrigerant. Thereby, it is possible to effectively prevent the water accumulated in the water storage tank 820 from being heated and turned into steam again.

According to the cold trap 801, the pressure cutoff valve 811 provided on the upstream side of the water storage tank 820 is provided.
And open the pressure cutoff valve 8 provided on the downstream side of the water storage tank.
Close 12. As a result, a large amount of water vapor generated in the decompression fry chamber 1 is trapped in a water state (liquid state) on the trapping surface 830 and accumulates in the water storage tank 820 through the upstream side of the drainage pipe 813. After a predetermined time, after closing the pressure shut-off valve 811, the pressure shut-off valve of the pressure adjusting pipe is opened, and after the inside of the water storage tank is returned to normal pressure, the pressure shut-off valve 812 on the downstream side of the water storage tank is opened.
The water stored in the water storage tank 820 is discharged through a drainage pipe 813. When discharging the water, the vacuum fry chamber 1
And the outside are not communicated with each other, so that the water vapor can be continuously removed while maintaining the inside of the decompression fry chamber 1 in a decompressed state.

Further, it is preferable to provide a flow control valve 840 between the cold trap 8 and the reduced pressure fry chamber 1.
This is because, for example, when the amount of water vapor generated inside the reduced pressure fry chamber 1 is small, such as when a small amount of raw material is processed due to variation in the amount of input, the degree of reduced pressure inside the reduced pressure fry chamber 1 becomes too good. This lowers the freezing point of the water,
As a result, there is a possibility that water vapor cannot be trapped in the state of water. In order to prevent this, it is useful to prevent the inside of the decompression fry chamber 1 from becoming better than a predetermined decompression degree, and the flow control valve 840 is the simplest and desirable as a means for that.

The unloading slope 106 of the decompression fry chamber 1
As shown in FIG. 1 and FIG. 5, a discharge port 110 is provided at the upper terminal end. The discharge port 110 communicates with the product cooling chamber 4 via a shutoff valve 900. After the decompression fry processing is completed, the decompression fried product transferred to the upper part of the carry-out slope 106 by the partition net 52 falls from the discharge port 110. When the decompressed fried product accumulates in a predetermined amount or more, the shutoff valve 900 is opened and the product is put into the product cooling chamber 4.

The product cooling chamber 4 is provided with a cooling mechanism 401, and after closing the shutoff valve 900, cools the supplied reduced pressure fried product to a predetermined temperature.

A pressure shutoff valve 4 is provided below the product cooling chamber 4.
A product stock tank 5 is provided via 20.
The product stock tank 5 has a carry-out port 501,
The outlet 501 is constituted by a pressure cutoff valve.

Further, the product stock tank 5 is connected to the first vacuum pump 701. Then, the decompressed product cooled to the predetermined temperature in the product cooling chamber 4 is dropped into the stock tank 5 by opening the pressure shutoff valve 420.

Next, after the pressure shutoff valve 420 is closed, the discharge port 501 is opened to take out the reduced pressure fried product. After the removal, the outlet 501 is closed, and then the pressure of the product stock tank 5 is reduced again by the first vacuum pump 701 to the same reduced pressure as the reduced pressure fry chamber 1.

In another embodiment, in addition to the structure of the above embodiment, a retainer having a measuring device is provided between the end of the conveyor of the raw material supply device and the hopper of the raw material charging device, and the retainer having the measuring device is provided. Means for calculating the oil supply amount to each oil supply unit according to the position of the raw material transport path of the measured raw material, that is, the reduced-pressure frying time of the measured raw material, based on the measured measurement value, and This is a continuous pressure-reducing fryer provided with means for controlling the amount of oil supply to each oil supply unit based on the amount of supply.

According to this continuous-type decompression fryer, even when the input amount of the raw material is not constant, the calorie necessary for the frying process can always be supplied without excess or shortage, and a sufficiently porous fried product can be obtained. it can.

In still another embodiment, instead of the rotary valve of the above-described embodiment, an airtight valve and a pressure shutoff valve arranged in the conveying path of the pushing device are provided.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a raw material supply device.

FIG. 3 is a perspective view of a net conveyor.

FIG. 4 is an enlarged explanatory view of a decompression fry chamber.

FIG. 5 is an enlarged explanatory view near the discharge port of the decompression fry chamber.

FIG. 6 is a perspective view in which an oil storage tank is partially cut away.

FIG. 7 is a perspective view of a cold trap.

[Description of Signs] 1 Decompression fry chamber 2 Raw material input device 3 Raw material supply device 4 Product cooling chamber 10 Input port 21 Raw material hopper 22 Rotary valve 24a, 24b recess 26 Input bar 28 Extrusion surface 31 Raw material stock tank 32 Conveyor 42 Net conveyor 52 Partition net 107 Oil outlet 400 Cooling mechanism 500 Oil supply unit 600 Oil circulation path 604 Oil storage tank 801 Cold trap 820 Water storage tank

Claims (6)

(57) [Claims] A feeder having a pressure cut-off mechanism, a feeder and a product discharger, an extruder disposed below the feeder for transferring the raw material to the decompression fry chamber, and a feeder disposed in a transfer path of the extruder. Provided pressure cut-off valve, and carry-in and carry out the raw material while maintaining the reduced-pressure fry chamber provided with a conveying means that conveys the raw material in oil in the reduced-pressure fry chamber, carry out and carry out the raw material, in a reduced-pressure fryer for frying under reduced pressure, A continuous depressurization fryer, characterized by further comprising means for removing the deposits on the extruded surface of the extrusion device. 2. The continuous depressurized fryer according to claim 1, wherein said attached matter removing means is a raw material conveying means provided in said depressurized frying chamber. 3. The continuous depressurizing fryer according to claim 1, wherein said deposit removing means is an injection device for injecting oil from said depressurizing fry chamber. 4. The continuous depressurizing fryer according to claim 1, wherein the extruding surface is a surface substantially continuous with an inner wall of the depressurizing fry chamber when the extruding surface moves to the maximum in the extruding direction. 5. The continuous depressurizing fryer according to claim 1, wherein an oil outlet is provided on a side wall of the depressurizing fry chamber above the extruding device. 6. The continuous depressurizing fryer according to claim 1, wherein said extrusion device is a cylinder type.