JP7428325B2 - flyer - Google Patents

Description

The present invention relates to a continuous fryer equipped with two stages of upper and lower net conveyors.

In commercial fryers, applying an electric field to the oil used for frying or to the processed products during frying is said to have the effect of preventing deterioration of the oil and improving the taste of processed foods.

Therefore, in order to apply this technology to a continuous fryer, for example, a voltage application circuit is installed in the gap between the left and right sides of the upper and lower two-stage net conveyor installed in the oil tank and the inner surface of each side wall of the oil tank. It has been proposed to arrange flat electrodes (Patent Document 1) or to arrange frame-shaped electrodes for voltage application inside each of the upper and lower net conveyors in parallel with each conveyor net ( Patent Document 2).

Utility model registration No. 3165708

Japanese Patent Application Publication No. 2001-95695

In the former case of the prior art, the electric field in the oil is concentrated between the voltage application electrode and the side ends of the upper and lower net conveyors, and in the latter case, the electric field in the oil is concentrated between the voltage application electrode and the side ends of the upper and lower net conveyors. As a result, in both cases, the necessary electric field is hardly formed between the upper and lower net conveyors on which the workpiece is transported, and a sufficient effect cannot be expected. Further, the electrodes installed in the oil tank may themselves become a hindrance during cleaning work or may obstruct the flow of oil within the oil tank.

Therefore, in view of the problems of the prior art, an object of the present invention is to apply a voltage directly to the upper conveyor, thereby eliminating the need for the electrode itself for applying the voltage, and at the same time eliminating the need for the upper and lower net conveyors on which workpieces are conveyed. An object of the present invention is to provide a fryer capable of forming a substantially uniform electric field between the fryers.

The configuration of the present invention to achieve such an object includes an oil tank, an upper conveyor and a lower conveyor installed in upper and lower stages in the oil tank, and a power supply device that applies voltage to the upper conveyor. The lower conveyor is a net conveyor in which an endless conductive conveyor net is installed between the left and right frames so that they can circulate, and the frame of the upper conveyor is placed on the frame of the lower conveyor via an insulating support material. The gist is to insulate the upper conveyor from the grounded oil tank and lower conveyor.

Note that the upper conveyor can be raised and lowered via a lifting mechanism having an insulating hanging device.

Additionally, the drive motor for the upper conveyor may be insulated from the upper conveyor and mounted on the frame of the upper conveyor, or may be connected to the shaft for the drive sprocket of the upper conveyor via an insulating coupling. .

According to the structure of the invention, the power supply device applies a voltage to the upper conveyor so that the workpiece is transported between the lower surface of the conveyor net of the upper conveyor and the upper surface of the conveyor net of the lower conveyor, which face each other vertically. A nearly uniform electric field can be formed in the oil between the upper and lower net conveyors, and a good electric field effect can be expected for both the frying oil and the workpieces being fried. can. In addition, since the bottom side of the conveyor net of the upper conveyor can be used as an electrode for voltage application and electric field formation, there is no need to install other special electrodes in the oil tank, which eliminates the inconvenience caused by installing electrodes in the oil tank. There's no risk of it happening.

By installing the upper conveyor on the frame of the lower conveyor via an insulating support material, it can be easily insulated from the lower conveyor and the oil tank in which the lower conveyor is installed. Note that the support material may be used as long as it is possible to install the frame of the upper conveyor on the frame of the lower conveyor via it, and in addition to long materials that are continuous in the front-rear direction of the upper conveyor and lower conveyor, multiple supports may be used in the same direction. It can be formed into any form such as a block material in which the materials are dispersed.

The upper conveyor combined with the lifting mechanism can be hoisted high by the lifting mechanism if necessary, which is convenient, for example, during cleaning operations. Note that the insulating hanging tool can maintain insulation between the upper conveyor and the lifting mechanism regardless of the lifting height of the upper conveyor.

If the drive motor for the upper conveyor is insulated from the upper conveyor and mounted on the frame of the upper conveyor, even if the casing of the drive motor itself is grounded for safety, the insulation of the upper conveyor may be disturbed. do not have. Note that the drive motor in this case can be connected to the shaft for the drive sprocket of the upper conveyor via an insulating coupling, for example, to complete insulation from the upper conveyor.

Overall configuration schematic vertical cross-sectional view Schematic cross-sectional view equivalent to the line XX in Figure 1 Overall configuration schematic side view Operation explanation diagram Figure 2 equivalent explanatory diagram showing a comparative example

Embodiments of the invention will be described below with reference to the drawings.

The fryer includes an oil tank 31, an upper conveyor 10, a lower conveyor 20, and a power supply device 32 (FIGS. 1 and 2). However, the upper conveyor 10 and the lower conveyor 20 are installed in two stages, upper and lower, in the oil tank 31, and the power supply device 32 can apply the voltage V to the upper conveyor 10 via the output cable 32a.

The oil tank 31 is a box-shaped container that is long from front to back, and can heat oil F for frying stored therein to a predetermined temperature by a heat source such as a burner or a heater (not shown). Note that the bottom surface of the oil tank 31 is formed into an obliquely upward slope 31a with a gentle front portion.

The upper conveyor 10 is a net conveyor in which an endless conductive conveyor net 12 made of, for example, metal is installed between left and right frames 11, 11 so as to be able to circulate. The front part of the upper conveyor 10 is formed diagonally upward following the slope 31a of the front part of the oil tank 31, and the conveyor net 12 has a plurality of rollers on the front and rear shafts 13a, 13a between the frames 11, 11. It is wrapped around 13, 13... Note that a guide roller (not shown) is disposed at the intermediate portion of the upper conveyor 10.

The shafts 13a of the rollers 13, 13, . It is connected to the output shaft 14a of. Note that the drive motor 14 is mounted on the frames 11, 11 of the upper conveyor 10 in a state insulated from the upper conveyor 10 via a bracket (not shown). The drive motor 14 is a variable speed motor whose drive is controlled via a control device (not shown), and can drive the upper conveyor 10 in the direction of arrow K1 in FIG. The casing of the drive motor 14 is grounded for safety.

The lower conveyor 20 is a net conveyor configured by incorporating an endless conductive conveyor net 22 made of metal, for example, between left and right frames 21, 21 so as to be able to circulate. The front part of the lower conveyor 20 is formed diagonally upward following the slope 31a of the front part of the oil tank 31, and protrudes from the front end of the oil tank 31, and the conveyor net 22 has a front and back shaft 23a between the frames 21, It is wound around each of the plurality of rollers 23, 23, . . . on 23a. Note that a guide roller (not shown) is provided in the middle of the lower conveyor 20.

The shafts 23a of the rollers 23, 23, . are mounted on the frames 21, 21 of the lower conveyor 20. The drive motor 24 is a variable speed motor whose drive is controlled via a control device (not shown), and can drive the lower conveyor 20 in the direction of arrow K2 in FIG. Note that the rear part of the lower conveyor 20 extends beyond the rear end of the upper conveyor 10 along the bottom surface of the oil tank 31.

The frames 21, 21 of the lower conveyor 20 are installed on the bottom surface of the oil tank 31. Further, the frames 11, 11 of the upper conveyor 10 are installed on the frames 21, 21 of the lower conveyor 20 via left and right insulating support members 25, 25, and the entire upper conveyor 10 except the drive motor 14 is It is insulated from the oil tank 31 and the lower conveyor 20.

The upper conveyor 10 and the lower conveyor 20 transport the workpieces W, W, etc., which are introduced into the rear part of the oil tank 31, through their lower and upper surfaces while being submerged in the heated oil F in the oil tank 31. It can be fried until it reaches the front end of No. 31. Note that the workpieces W, W... are continuously fed onto the conveyor net 22 of the lower conveyor 20 at the rear of the oil tank 31 (in the direction of arrow K in FIG. 1), and at the front end of the oil tank 31, the workpieces W, W... The oil is discharged to the front of the oil tank 31 via the diagonal section. However, in FIG. 1, the frames 11 and 21 of the upper conveyor 10 and the lower conveyor 20 are not shown.

The upper conveyor 10 is suspended so that it can be raised and lowered via a lifting mechanism 40 (FIGS. 2 and 3). However, in FIG. 3, the frames 11 and 21 of the upper conveyor 10 and the lower conveyor 20, and the drive motors 14 and 24 are not illustrated.

The elevating mechanism 40 includes front, rear, left and right wires 42, 42, . . . for suspending the upper conveyor 10 via an insulating hanging device 41. The upper end of each wire 42 is wound around a winding drum 43, and each pair of front and rear winding drums 43, 43, . . . is fixed on a common drive shaft 43a. The front and rear drive shafts 43a, 43a are arranged so as to cross the upper conveyor 10 via gantry frames 44, 44 with legs 44a, 44a installed on the left and right side edges of the oil tank 31. Can be synchronously rotated in forward and reverse directions via a variable speed motor.

Therefore, the upper conveyor 10 rotates the winding drums 43, 43... in the forward and reverse directions simultaneously via the drive shafts 43a, 43a, and winds up and lowers the wires 42, 42... on the front, back, left, and right sides, thereby maintaining the horizontal position. It can be lifted up and raised above the left and right supporting members 25, 25 while maintaining the position, and then lowered onto the supporting members 25, 25. Further, when the frames 11, 11 and the supports 25, 25 of the upper conveyor 10 are integrally connected, for example, via an engagement bracket (not shown), the elevating mechanism 40 can raise and lower the upper conveyor 10 and the lower conveyor 20 at once. It can also be conveniently used when cleaning the upper conveyor 10, lower conveyor 20, and oil tank 31.

The output cable 32a of the power supply device 32 is connected to the frame 11 of the upper conveyor 10 (FIG. 2). However, regardless of what is shown in the drawings, the output cable 32a is assumed to have a sufficient length to accommodate the vertical movement of the upper conveyor 10, and can be disconnected from the upper conveyor 10 via a connector (not shown) if necessary. You can also use it as

The output specifications of the power supply device 32 are preferably within the following range, for example. That is, it may be a positive or negative DC output or an AC output with a frequency of 20 kHz or less including a commercial frequency, and the voltage V may be approximately 0.2 to 20 kV. In addition, the power supply device 32 incorporates a current limiting circuit that limits the output current to, for example, 5 mA or less, or a current monitoring circuit that instantly cuts off the output current when the output current increases by, for example, 5 mA or more. It is preferable to prevent electric shock accidents for workers.

In the fryer, the upper conveyor 10 and the lower conveyor 20 are operated at the same speed to continuously fry the workpieces W, W..., and when a voltage V is applied to the upper conveyor 10 by the power supply device 32, the upper conveyor 10 A substantially uniform electric field can be formed between the lower surface side of the conveyor net 12 and the upper surface side of the conveyor net 22 of the lower conveyor 20, that is, in the oil F in which the workpieces W, W... are conveyed (see FIG. 4). Curve (1)). However, the horizontal axis in FIG. 4 indicates the position of the upper conveyor 10 and the lower conveyor 20 in the width direction in FIG. 2, and the vertical axis indicates the relative value of the electric field strength between the conveyor nets 12 and 22. Note that the upper conveyor 10 is insulated from the lower conveyor 20, oil tank 31, and lifting mechanism 40, and the lower conveyor 20 and oil tank 31 are grounded together with the casing of the drive motor 14 and the housing of the power supply device 32.

Incidentally, curves (2) and (3) in FIG. 4 are comparative example data when the voltage application electrode P is arranged in the oil tank 31 according to FIGS. 5A and 5B, respectively. In FIG. 5A, flat electrodes are connected between the left and right sides of the upper conveyor 10 and the lower conveyor 20, which are not insulated, and the inner surface of each side wall of the oil tank 31 via insulating supporting materials 25, 25. P, P are arranged, and a voltage V of the same polarity is applied to each electrode P via output cables 32a, 32a from the power supply device 32. In FIG. 5(B), a flat electrode P is insulated and arranged inside the conveyor net 22 of the lower conveyor 20, and a voltage V is applied to the electrode P via an output cable 32a from a power supply device 32. has been done. However, in FIGS. 5A and 5B, illustration of the power supply device 32 is omitted.

According to the configuration of FIG. 5A, the electric field between the conveyor nets 12 and 22 is extremely unevenly distributed at the left and right side ends of the upper conveyor 10 and the lower conveyor 20 (curve (2) in FIG. 4). According to the configuration shown in FIG. 5(B), the electric field is uniformly distributed in the width direction of the upper conveyor 10 and the lower conveyor 20 (curve (3) in FIG. 4), but its strength is Only about 1/5 of 1) can be obtained in the case of this invention. However, in FIG. 4, since the absolute value of the electric field strength depends on the voltage V from the power supply device 32, the voltage V may be appropriately set as necessary.

In addition, the general specifications of the upper conveyor 10 and the lower conveyor 20 when curves (1) to (3) in FIG. The distance between the sides is 40 mm, and the distance between the bottom side of the conveyor net 12 and the top side of the conveyor net 22 is 55 mm. Further, each electrode P in FIG. 5(A) is a SUS430 plate with a width of 15 mm in the vertical direction x a length of 700 mm in the longitudinal direction x a thickness of 1 mm, and an electrode P in FIG. It is a SUS430 plate with a length of 590 mm, a longitudinal length of 400 mm, and a thickness of 1 mm, and the distance from the top side of the conveyor net 22 is 8 mm.

In the above description, the upper conveyor 10 includes insulating supports 25, 25, hanging tools 41, 41, in order to apply a voltage V from the power supply device 32 and operate the conveyor net 12 as an electrode for forming an electric field. The drive motor 14 is insulated and mounted on the frames 11, 11 in order to insulate it from the lower conveyor 20, oil tank 31, and lifting mechanism 40 via... and further ground the casing of the drive motor 14 to increase safety. At the same time, an insulating coupling 14b is introduced. Therefore, the specific insulating support structure of the upper conveyor 10 may be further modified as long as the same operational function can be achieved.

The present invention can be widely and suitably applied to large and small commercial fryers for food processing that are equipped with two upper and lower net conveyors.

V...Voltage 10...Upper conveyor 11...Frame 12...Conveyor net 13c...Drive sprocket 13d...Shaft 14...Drive motor 14b...Coupling 20...Lower conveyor 21...Frame 22...Conveyor net 25...Support material 40...Elevating mechanism 41... hanging equipment

Patent applicant: Asahi Sousetsu Co., Ltd.

Claims (4)

It is equipped with an oil tank, an upper conveyor and a lower conveyor installed in upper and lower stages in the oil tank, and a power supply device that applies voltage to the upper conveyor. This is a net conveyor in which a conveyor net is installed between left and right frames so as to be able to circulate , and the frame of the upper conveyor is placed on the frame of the lower conveyor via an insulating support material, and the upper conveyor has the following features: A fryer characterized in that the oil tank is grounded and is insulated from the lower conveyor. 2. The fryer according to claim 1 , wherein the upper conveyor can be raised and lowered via a lifting mechanism having an insulating hanging device. 3. The fryer according to claim 1 , wherein the drive motor for the upper conveyor is mounted on a frame of the upper conveyor insulated from the upper conveyor. 4. The fryer according to claim 3 , wherein the drive motor for the upper conveyor is connected to a shaft for a drive sprocket of the upper conveyor via an insulating coupling.

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