JPH0889419A - Microwave fryer - Google Patents

Abstract

PURPOSE: To provide an inexpensive microwave fryer that relatively prevents oil from being degraded and that is easy to clean since the oil tank is detachable. CONSTITUTION: A magnetron 18 is provided in a main body 1, and an oil tank 7, which contains oil to be heated by microwave of the magnetron 18, is detachably attached to a cooking room 2 of the main body 1. Above the oil tank 7 of the cooking room 2, a fryer 8, which has a mesh part through which microwave is transmitted in the oil, but almost not in the air and whose top aperture is shielded against electric wave, is detachably attached, and an elevating unit is provided to raise and lower the fryer 8 or the oil tank 7. Oil is heated by microwave in the oil tank 7 which is detachably attached to the cooking room 2, the oil tank 7 or the fryer 8 is raised or lowered with the elevating unit, and the fryer 8 is immersed in the oil in the oil tank 7 to fly a material to be cooked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave fryer utilizing microwave energy, and more particularly to a microwave fryer for heating oil in an oil tank detachably arranged in a cooking chamber by microwave. Is.

[0002]

2. Description of the Related Art A conventional flyer is Japanese Patent Publication No. 1-2668.
There was one disclosed in Japanese Patent Publication No. This conventional fryer is provided with an oil tank for storing oil in the lower part of the cooking chamber of the main body, and a meandering heater is arranged near the bottom of the oil tank,
A microwave generator that generates microwaves is provided in the main body. In the cooking chamber, a net-cage-shaped mounting body on which an object to be cooked is mounted is provided so as to be lifted and lowered by a lifting device.

Another conventional flyer is disclosed in Japanese Patent Laid-Open No. 59-62024. A seed heater for heating oil is provided in the heating chamber of the main body, and a circulation pump is provided for circulating the oil in the heating chamber between the heating chamber and an oil tank provided separately from the heating chamber. A microwave generator for supplying microwaves to the stored food to be cooked and the oil circulated in the oil tank by the circulation pump is provided.

[0004]

In the above-mentioned conventional fryer, since the oil is heated by the sheath heater arranged in the oil tank, the oil is easily deteriorated by touching the high temperature heater. And the structural problem that the cleanability of the oil tank is poor due to the arrangement of the sheath heater in the oil tank.

Further, in the fryer of Japanese Patent Publication No. 1-26689, the net-cage-shaped mount on which the food is placed is kept in the raised position by the lifting device.
When microwaves are supplied from the microwave generator, the object to be cooked is directly heated by the microwaves, and may be cooked by the microwave heating before being cooked by the oil.

In order to commercialize the above-mentioned fryer for household use and to meet the needs, it is preferable to use a multi-function product having a rice cooking function and a steam cooking function in addition to the frying function. For that purpose, it is necessary to create an oil tank attachment / detachment structure that allows women to easily replace the oil tank with a water tank.

On the other hand, in order to avoid the risk of splashing oil when the food to be cooked is put in or taken out from the domestic fryer, the structure as disclosed in the above-mentioned JP-A-59-62024, That is, it is preferable to employ a structure in which heated oil is supplied to the food to be cooked in the oil tank and frying is performed by heating with oil and heating with microwaves, but in the above-mentioned JP-A-59-62024. The problem is that an oil tank must be provided separately from the heating chamber, the fryer body must be large, and a circulation pump for circulating oil and an oil circulation path must be provided, which complicates the overall structure. was there.

The microwave fryer of the present invention has been made in view of the above problems, and heats the oil in the oil tank detachably arranged in the cooking chamber by the microwave so that the oil tank or the frying container can be moved by the lifting device. The purpose is to raise and lower and immerse the frying container in the oil in the oil tank to cook the food.

[0009]

In order to achieve the above object, the microwave fryer according to claim 1 of the present invention comprises:
A microwave generator is arranged in the main body, and an oil tank for storing oil heated by microwaves of the microwave generator is detachably arranged in the cooking chamber of the main body, and above the oil tank of the cooking chamber. In addition, an elevating device for detachably arranging a fly container having a mesh portion that transmits microwaves in oil and hardly penetrates in air and has an upper surface opening sealed with a radio wave, and raises and lowers the fly container or the oil tank is provided. It is provided.

The microwave fryer according to claim 2 is
The top opening of the fry container is raised by the elevating device to perform radio wave shielding on the ceiling wall of the cooking chamber.

The microwave fryer according to claim 3 is
The ceiling wall of the cooking chamber is composed of a lid body which is openably and closably arranged.

The microwave fryer according to claim 4 is
A biasing means is provided for applying a biasing force to the fly container or the oil tank in the ascending direction.

[0013]

In the invention of claim 1, since the oil is heated by the dielectric loss of the oil by the microwave, the oil is less likely to be deteriorated by touching the high temperature portion (for example, the sheath heater), and the heating device is not attached to the oil tank. The oil tank has good cleanability, the oil tank can be easily attached and detached, and the microwave does not directly heat the food to be cooked.

According to the second aspect of the present invention, even if the microwave shielding lid is not provided on the upper opening of the frying container, the upper opening can be sealed by radio waves by bringing the upper opening close to the ceiling wall of the heating chamber, and the frying container can be cooked. It is possible to easily realize microwave heating of only oil in the state where the object is stored. In addition, by utilizing the microwave heating characteristic that the cooked food containing a large amount of water is intensively heated by controlling the microwave heating with the top opening of the frying container separated from the ceiling wall of the heating chamber. Therefore, preheating of the food to be cooked can be easily realized.
As a matter of course, the food can be put in and taken out simply by taking out the frying container from the heating chamber.

According to the third aspect of the present invention, the electric wave seal can be applied to the top opening of the frying container simply by closing the lid for loading and unloading the cooking object, and only the oil is contained in the frying container containing the cooking object. Microwave heating is possible, and preheating of the food can be done easily, and the food is put in and out simply by opening the lid.

According to the invention of claim 4, the load at the time of starting the drive motor can be reduced, and the cost can be reduced by adopting the low output drive motor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microwave fryer according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a main part of a microwave fryer, in which 1 is a main body having a cooking chamber 2 having an opening on its upper surface, and 3 is a lid for opening and closing the opening of the cooking chamber 2 at the front. The main body 1 has a handle (not shown) and a hinge 4 at the rear.
It is fixed rotatably to. The microwave is not leaked from the cooking chamber 2 closed by the lid 3.

A dish-shaped table plate 5 is detachably attached to the table support shaft 6 at the bottom of the cooking chamber 2.
An oil tank 7 made of a transparent glass container having a bottomed cylindrical shape is detachably placed on the table plate 5, and a stainless steel frying container 8 having a bottomed cylindrical shape is provided on an upper portion of the oil tank 7 with a handle portion 8.
A is mounted on the opening step 2a of the cooking chamber 2 so as to be detachable. Lifting part 8a of the frying container 8
Is attached with an oil temperature sensor 9 for detecting the temperature of the oil in the oil tank 7, and the oil temperature signal is sent to the electrical connector 1
It is input to the control unit built in the main body 1 via 0. In addition, the gap between the opening surface of the fry container 8 and the inner surface of the lid 3 is set to several millimeters or less so that microwaves can be prevented from entering the fry container 8.

Further, as shown in FIG. 2, a hole group 8b is formed on the bottom surface of the fry container 8 so that microwaves are hardly transmitted in the air and microwaves are transmitted in the oil.
The hole diameter of the hole group 8b is 3 to 15 mm (9 mm is preferable in the embodiment)
The hole spacing is 10 mm.

When the hole diameter of the hole group 8b is 15 mm or less, the relative permittivity of air as a microwave transmission medium is ε in the air.
Since γ is about 1, the microwave is transmitted and attenuated so that the microwave is not transmitted through the fly container 8. This has the same effect as the punching plate of the door of the microwave oven. On the other hand, when the frying container 8 is immersed in oil, the microwave as the microwave transmission medium has a relative permittivity of εγ = about 3 to 5, so that the microwave was attenuated in the air and did not penetrate. Inside, the oil is transmitted, and the microwave penetrates into the frying container 8 and reaches the object to be cooked. For example, when an experiment in which the frying container 8 having the hole group 8b having the above-mentioned hole diameter is immersed in oil and microwaves are intermittently applied, when the microwaves are being applied, The bubbling occurs vigorously from the food to be cooked, and when the application of the microwave is stopped, the bubbling from the food to be cooked is stopped, and the microwave is transmitted through the group of holes 8b of the frying container 8 to the food to be cooked. I was able to confirm that I had reached.

The table support shaft 6 is vertically pierced through the bottom wall of the heating chamber 2, and one end of an elevating lever 11 is rotatably connected to a lower end portion thereof. The elevating lever 11 is rotatably supported by the main body 1 at its central portion, has a cam elongated hole 11a at the other end, and is connected to a drive motor 13 via a disc 12 with a crank pin 12a. Reference numeral 14 denotes a micro switch for detecting the bottom dead center of the table support shaft 6, which is detected by pressing the knob by the crank pin 12a when the other end of the elevating lever 11 reaches the top dead center. It is arranged.

On the other hand, a tension spring 15 is stretched between the end of the elevating lever 11 and the outer bottom of the heating chamber 2. The spring 15 has a spring constant set so as to cancel out the weight when a predetermined amount of oil is stored in the oil tank 7 when it is an intermediate length of the expansion / contraction length (the elevating lever is in a horizontal state). The cost of the drive motor 13 is reduced by reducing the starting torque.

In the present embodiment, the table support shaft 6, the elevating lever 11, the disk with the crank pin, the drive motor 13, the micro switch 14, and the spring 15 constitute an elevating device 16.

Reference numeral 17 is a waveguide for supplying microwaves to the cooking chamber 2, 18 is a magnetron (microwave generator) arranged in the waveguide 17, and 19 is a magnetron 18 or a high voltage transformer (not shown). It is a blower that cools heat-generating components such as.

A control panel (not shown) is provided on the upper front side of the main body 1 and includes a control board having an operating means such as a menu key and a start key, a display means, and a microcomputer for controlling the entire fryer. ing.

FIG. 3 is an electrical block diagram of the embodiment shown in FIG. Signals associated with operations such as a key for setting the oil temperature, a key for setting the flying time, a key for setting the type of fly, a start key, etc., provided on the operation panel 20 are input to the interface 21. The output from the oil temperature sensor 9 is given to the interface 21 via the A / D converter 22, and the signal from the micro switch 14 for detecting the bottom dead center of the table support shaft is given directly to the interface 21. The interface 21 is connected to a processing circuit 23 realized by a microcomputer or the like, and the processing circuit 23 includes the CPU 24, ROM 25, RAM 2
It is composed of 6 etc. and controls the entire flyer. The output from the interface 20 is given to a switching transistor connected in series to the relay coil, and the switch 28 for driving and controlling the microwave generator 27 and the switch 29 for controlling the drive motor 13 are opened and closed.

Next, the operation of the microwave fryer according to the present invention will be described based on the above configuration and the flowchart shown in FIG.

First, the power of the fryer is turned on, and the type of frying or oil temperature and frying cooking time are set. Then, the lid 3 is opened to supply a predetermined amount of oil into the frying container 8. The supplied oil flows from the frying container 8 into the oil tank 6. When the oil tank 6 has been refueled, the food to be cooked is put in the frying container 8, the lid 3 is closed, and the start key is pressed. With the oil tank 7 lowered, the microwave generator 27 is driven to heat the oil in the oil tank 6. Since the frying container 8 is in the air, the food to be cooked is cut off from supplying microwaves and is hardly heated.

Then, the oil is heated to the temperature set by the control panel 20, and the oil temperature sensor 9 sets the set temperature (about 180 ° C.).
Is detected, the drive motor 13 rotates for a predetermined time (the time required for the table support shaft to rise from the bottom dead center to the top dead center) to raise the oil tank 7 and immerse the frying container 8 in the oil. In this state, the microwave is supplied into the frying container 8, so that the object to be cooked is microwave-heated while being fried-cooked with the oil heated by the microwave.

When the frying cooking time has elapsed, the microwave generator 27 is stopped and the drive motor 13 is rotated to lower the oil tank 7 and driven by a signal from the micro switch 14 for detecting the bottom dead center of the table support shaft. The motor 13 stops. Then, when a predetermined time (for example, 30 seconds) set so that the oil removal is completely performed has passed, a notification unit (not shown) notifies that the frying cooking is completed.

When the frying cooking is automatically completed as described above, the lid 3 is opened and the food to be cooked is taken out from the frying container 8. When fried cooking is continued, the above-mentioned operation is repeated if the food to be cooked is put in the frying container 8 and the lid 3 is closed and the start key is pressed. When it is maintained, the frying cooking is performed by raising the oil tank 7.

In the above-mentioned fryer according to the present invention, the lid 3 can be opened to easily remove the frying container 8 and the oil tank 7 from the cooking chamber 2, so that it is easy to change the oil or clean the oil tank 7 and the frying container 8. Is.

Then, the oil tank 7 and the frying container 8 are removed and replaced with the oil tank 7 and the frying container 8, and a rice cooking container (not shown) containing a predetermined amount of rice and water is placed on the table plate 5, and the magnetron 18 is removed. Cook rice by microwave. At this time, by forming the rice cooking container with a microwave absorbing heating element, the entire rice cooking container generates heat and rice can be cooked from the whole.

Further, after the oil in the oil tank 7 is heated by the microwave to reach the set temperature, the frying container 8 is lifted up and down 16
With the degree that the frying container 8 is not soaked in the oil in the oil tank 7, the top opening of the frying container 8 is separated from the lid body 3 and lowered to a position where microwaves are supplied into the frying container 8, and the food to be cooked in the frying container 8 is reserved. A better cooking state can be obtained by heating to remove excess water of the food to be cooked, and then further descending the frying container 8 to immerse it in the oil in the oil tank 7 for frying.

In the above, the lid 3 covers the upper opening of the fly container 8 with a radio wave, but a lid that opens and closes the upper opening of the fly container 8 may be used to seal the radio wave. If the lid is detachably formed, it is easier to use.

5 and 6 show an embodiment of a fryer for raising and lowering the frying container, which is the reverse of the above-mentioned embodiment.
Shows a state in which the fry container is raised, and FIG. 6 shows a state in which the fry container is lowered. Since the function of the fryer is the same, the names of the main parts are listed and only the different parts will be explained.

Reference numeral 31 is a main body, 32 is a heating chamber, 33 is a lid (door), 36 is a gear 34 fixed to the motor shaft of a drive motor, and a tooth bar 35 that is raised and lowered by meshing with the gear 34. Lifting device (the lifting device disclosed in Japanese Patent Laid-Open No. 58-136321), 37 is an oil tank, and 38 is the uppermost opening in the uppermost state, the upper opening is radio wave sealed by the ceiling wall of the heating chamber 32, and is immersed in the oil tank 37 in the lowering state. In the fry container, a group of holes 38b that transmits almost no microwaves in the air and transmits microwaves in the oil is formed so as to extend from the bottom wall to the side wall. Reference numeral 39 is a compression spring that applies an upward biasing force to the frying container 38. In addition, 17 is a waveguide, 1
8 is a magnetron.

[0039]

According to the first aspect of the present invention, since the oil is heated by the dielectric loss of the oil due to the microwave, deterioration due to the oil coming into contact with a high temperature portion (for example, a sheathed heater) hardly occurs,
Since the heating device is not attached to the oil tank, the oil tank can be easily cleaned, the oil tank can be easily attached and detached, and not only frying cooking but also other cooking can be performed. Further, since the microwave hardly penetrates the food to be cooked placed in the frying container in the air, the food to be cooked is microwaved while the oil in the oil tank is microwave-heated to the set temperature. It is possible to prevent cooking by heating.

According to the second aspect of the present invention, even if the microwave shielding lid is not provided on the top opening of the frying container, the top opening can be sealed by the radio wave by bringing the top opening close to the ceiling wall of the heating chamber, and the frying container can be cooked. Microwave heating of oil only can be easily realized with the food contained, and preheating of the cooked food is performed by controlling the microwave heating with the top opening of the frying container separated from the ceiling wall of the heating chamber. Can be easily achieved.

According to the third aspect of the present invention, microwave can be heated only with oil in a state in which the food to be cooked is stored in the frying container simply by closing the lid for loading and unloading the food to be cooked. Is the easiest because it only opens the lid.

According to the invention of claim 4, the load at the time of starting the drive motor can be reduced, and the cost can be reduced by adopting the low output drive motor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an essential part showing an embodiment of a microwave fryer according to the present invention.

FIG. 2 is an external perspective view of a fry container according to the present invention.

FIG. 3 is a block electric circuit diagram of the microwave fryer of FIG.

FIG. 4 is a flowchart illustrating a control operation of a microwave fryer according to the present invention.

FIG. 5 is a vertical sectional view showing a state in which a frying container is raised in another embodiment of the microwave fryer according to the present invention.

FIG. 6 is a vertical sectional view showing a state in which a frying container is lowered in another embodiment of the microwave fryer according to the present invention.

[Explanation of symbols]

 1 main body 2 cooking chamber 3 lid 5 table plate 6 table support shaft 7 oil tank 8 frying container 8b hole group (mesh) 9 hot water temperature sensor 11 lifting lever 13 drive motor 14 micro switch 15 spring (biasing means) 16 lifting device 17 magnetron

Claims (4)

[Claims] 1. A microwave generator disposed inside the main body, and an oil tank which is detachably disposed in a cooking chamber of the main body and stores oil heated by microwaves of the microwave generator. A frying container which is detachably disposed above the oil tank of the cooking chamber and has a mesh portion that transmits microwaves in oil and hardly penetrates in air and has a top opening sealed by radio waves; A microwave fryer, comprising: a lifting device that lifts and lowers an oil tank. 2. The microwave fryer according to claim 1, wherein an opening of an upper surface of the frying container is raised by the elevating device and radio wave is sealed on a ceiling wall of the cooking chamber. 3. The microwave fryer according to claim 2, wherein the ceiling wall of the cooking chamber is constituted by a lid which is openably and closably arranged. 4. The microwave fryer according to claim 1, wherein the frying container or the oil tank is provided with an urging means for applying an urging force in a rising direction.