JPS5986193A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in the turntable mechanism of a so-called microwave oven.

Conventional Structures and Problems Conventional high-frequency heating apparatuses, for example, in which a dedicated motor is disposed below the bottom wall of a cooking cabinet as a drive source for a turntable, can be roughly classified into the following two types. however,
The turntable mechanism referred to here is considered to be one in which a rotating shaft for driving a rotating food table on which food is placed is installed so as to penetrate through the bottom wall of the cooking cabinet. Figure 1 shows
One example is shown. An electric motor 1 serving as a drive source is provided with a bearing 2 that pivotally supports an output shaft 3.

A protruding hole 5 is installed approximately in the center of the bottom surface 4 of the cooking chamber, and a rotary shaft 7 that engages with both the rotary mounting table 6 on which food is placed and the output shaft 3 is installed passing through this hole. There is. A pin 8 is fixedly attached to the output shaft 3, and a pin 8 is fixedly attached to the rotating shaft 7.
The recess 10 at the center of the rotating mounting table 6 engages with the rotating shaft 7 to receive the rotating force. The rotating mounting table 6 is supported by a plurality of rollers 11 disposed on the inner bottom surface 4 of the cooking cabinet, and rotates while maintaining the horizontal position. The electric motor 12 is fixed to the cooking cabinet 4 with screws 12, and the electric motor 1 is attached with screws 13. That is, in this example, the rotating shaft protruding into the cooking chamber and the output shaft of the electric motor are coaxial. Although such a configuration can simplify the structure, save space, and save cost, it has the following drawbacks. Pour milk and soup in the cooking cabinet: f, t,
When a user pours water to clean the interior of the cooking chamber, the water that flows into the gap between the rotating shaft 7 and the cooking chamber 4 is transmitted to the output shaft 3 along the surface of the rotating shaft 7, and is transferred to the bearing 2. It enters into the main body of the electric motor 1 through the gap between the two.

The inside of an electric motor is made up of gears, shafts, bearings, windings, and their insulators, etc. In the driving parts, rust may occur due to salt contained in boiling liquid, etc., or liquid that flows in may solidify. If it sticks, preventing normal operation, or if it adheres to the winding or its insulation, the insulation will deteriorate significantly and there is a risk of electric shock to the user.

FIG. 3 shows another type of structural diagram.

A mounting body 14 is installed on the outer bottom surface of the cooking chamber 4, and the electric motor 1 is attached to the mounting body 14. A gear 15 is fixed to the main shaft 3, and an engaged gear 16 is driven.

The gear 16 is fixed to a rotating shaft 18 supported by two bearings 17& and 17b. The bearing 17& is fixed to a mounting plate (small) 19, and the bearing 17b is fixed to the mounting body 14 via a mounting plate (medium) 20 with screws 21. The rotating mounting table 22 has an engaging portion 23 that engages with the cooking cabinet protrusion of the rotating shaft 18.
is provided to transmit rotation. In the case of this type, even if water or broth flows out from the through hole 24 for the rotating shaft 18 of the cooking chamber 4, it is difficult to flow into the inside of the electric motor 1. However, in this case, as can be seen from FIG. 3, the structure becomes quite complicated, the number of parts increases, and a large amount of space is required. In addition, in order to transmit the rotational torque of the electric motor without waste, it is important not only to check the dimensional accuracy and positional relationship between the rotating shaft and the bearing, but also the dimensions and meshing conditions of the gears, which greatly affect the loss in the torque transmission process. Therefore, it must be strictly managed. In other words, productivity, material cost,
The present invention solves the above-mentioned conventional drawbacks, and has a simple structure. , Even if water, broth, etc. flows out of the rotation 11+111゛↓ through hole, it will not attach to the motor, and even if it gets attached to the drive part, it will not interfere with the rotation drive. High-frequency heating with a rotating mounting table drive mechanism. The purpose is to realize the device.

According to the present invention, in order to achieve the second object of "Structure of the Invention", a rotary coupling body that engages with the rotary shaft that directly rotates the rotary mounting table and the output shaft of the electric motor that is the drive source is provided between the rotary shaft that directly rotates the rotary mounting table, The engagement with the rotating shaft is achieved by covering the entire engaging portion of the rotating shaft. At this time, even if water flowing on the surface of the rotating shaft flows into the concave part of the coupling body, which is the engagement part between the rotating coupling body and the rotating shaft, the shape and material are such that it will not flow out to the output shaft of the motor. Needless to say, it is necessary. When the outflow of water etc. from inside the cooking chamber increases, the inside of the recess of the rotary coupling body becomes filled with the spillage and eventually begins to overflow.However, the rotary coupling body is provided with a so-called umbrella-shaped protrusion on its outer periphery. Therefore, the effluent does not travel along the surface of the rotating coupling body and attach to the output shaft of the electric motor. The electric motor is attached to the motor mounting body on the opposite side of the rotary coupling body, and only the bearing portion and the output shaft are mounted so as to pass through an upwardly protruding hole in the motor mounting body. Since the protruding portion of the rotary coupling body is provided at a position avoiding the hole existing in the motor mounting body, the effluent dripping from the protruding portion stays on the surface of the motor mounting body on the rotary coupling body side.

If the hole provided in the motor mounting body is a flat hole, it is located below the motor mounting surface, and all other holes have a protruding shape, so the liquid flowing out from the hole will flow into the motor mounting body. It is impossible for the particles to travel along the surface of the motor body and attach to the motor. In fact, the amount of liquid that flows out of the cooking cabinet from around the rotating shaft per hour is quite small, so the difference in level between the motor mounting surface and the flat hole and the height of the protruding hole will cause the liquid to move upward due to its surface tension. It is sufficient if the dimensions are sufficient to prevent the backflow phenomenon from occurring.

In addition, in the case of the present invention, since it is a so-called direct drive system, which is different from the conventional example shown in Fig. 3 in which gears are connected by valves, it is possible to roughly connect the rotating shaft and the rotating coupling body. It can be realized in form. In other words, in the case of Fig. 3, the loss of transmission torque between the gears and the fitting of the bearings fixed to the mounting plates (medium) and (small) with the rotating shaft require considerable precision due to their structure. Therefore, the gap is naturally small, and the inflow material tends to get stuck, and if it gets stuck, even if you remove the rotary mounting table and move the rotary shaft by hand from inside the cooking cabinet in the radial direction of the shaft, Since the looseness itself is small, it is difficult to break the stuckness. The rotating shaft according to the present invention is mounted on the bottom wall of the cooking chamber with some play in the axial and radial inward direction, and the shaft is larger than the case shown in FIG. It is difficult to get stuck, and even if it gets stuck, the rotating shaft is inherently easy to move by hand, so if it gets stuck, it is easy to break.

In other words, according to the present invention, with a simple configuration, the boiling water, etc. that flowed out from the rotating shaft through hole of the cooking cabinet do not attach to the rotary drive motor, so that it does not have any adverse effect on the drive section of the motor, and the insulation of the winding section is improved. Since it does not reduce the performance, there is no risk of electric shock. In addition, even if spilled matter gets into the drive mechanism of the rotating mounting table,
It is possible to realize a high-frequency heating device that has a device that is less likely to cause malfunction due to sticking.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 4, an electric motor 1 serving as a drive source is provided with a bearing 2 that pivotally supports an output shaft 3. As shown in FIG.

A protrusion hole 5 is provided approximately in the center of the bottom surface 4 of the cooking cabinet.
A rotating shaft (upper) that engages with a rotating mounting table 6 on which food is placed is located so as to pass through this, and sandwich the bottom surface 4 of the cooking cabinet.
The rotating shaft (upper) 7 and the rotating shaft (lower) 8 are engaged and rotatably mounted in the protruding hole 6. Figure 5 shows this rotation axis (top)
(lower) is an enlarged view. Projection part s of rotating shaft (upper) 7
&: I:, rotating shaft ff), and the centers of the k i'1 through holes 11 and 12 provided in each are aligned, so that a bottle-shaped object (not shown) ), the two will remain engaged. FIG. 6 is a partially enlarged view of FIG. 4. Rotating coupling body 25 engaged with output shaft 3
forms four parts that cover the rotating shaft (lower) 8, and four convex parts 26 are provided in the recessed part for transmitting rotational force, as shown in FIG. It engages with the groove 27 at this location. With this configuration, when the output shaft 3 starts rotating, the rotation is transmitted from the rotating shaft to the rotating mounting table. Cooking room 40
The broth flowing out of the rotating shaft through hole travels along the surface of the rotating shaft (upper) 7 (lower) 8 and accumulates in the recess 28 of the rotating coupling body 25. At this time, the rotating coupling body 25 has a shape and material that prevents the broth from flowing out to the output shaft 3 side of the electric motor 1.

When the amount of boiling liquid that flows out increases, the inside of the recess becomes full, and the boiling liquid that overflows eventually flows down the outer peripheral side wall of the connecting body 25. However, since the connecting body is provided with protrusions 29 all around, the boiling liquid does not protrude. 30. Drop from the bottom end of the section 29. It does not travel along the surface of the connecting body 25 and reach the main force shaft 3 side. The dripped broth falls onto the top surface of the motor mounting body 31 and drips out of the product through the hole 33 provided below the motor mounting surface 32 and the lower end of the downward protruding hole 34, making it impossible to install the motor 1. Since the water does not flow out from the protruding hole 35 or the hole 36 that projects upwardly and corresponds to the bearing 2, the water does not flow to the electric motor 1 from the lower surface of the motor mounting body 31.

As described above, according to the present invention, even if water, broth, etc. flows out from the rotating shaft through hole of the cooking chamber, it will all be received by the recessed portion of the rotary coupling body, so that it will not flow out to the electric motor side. In addition, even if enough water flows out to fill the recess, all of the broth will drip through the tip of the protrusion provided on the outer periphery of the coupling body, so the broth will not be transmitted to the connection part of the coupling body that connects to the output shaft. There isn't. Furthermore, the boiling liquid that falls onto the top surface of the motor mounting body falls downward through the drain hole provided in the motor mounting body, but the hole either protrudes downward or, in the case of a flat hole, falls below the motor mounting surface. Because it is a built-in structure, it is possible to realize a structure that does not transmit any negative signals to the electric motor. In addition, the upper and lower rotating shafts are rotatably held by themselves in the cooking chamber through-hole, and even if the broth gets stuck in the gap between the rotating shaft (upper) and the through-hole, according to the structure of the present invention, Since the height of the through hole can be set small and the radial gap between the rotating shaft and the through hole can be set relatively large, even if it gets stuck, it can be easily restored.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) If water is used when cleaning the inside of the cooking cabinet or soup is spilled during cooking, even if it flows around the rotating shaft that drives the rotating mounting table, it will not be transmitted to the electric motor. ,
It can always be used in a normal state and its insulation properties are not compromised, ensuring safety.

(2) Even if boiling liquid or the like spills out and gets stuck, it can be restored relatively easily due to its structure.

(Ko) The rotating coupling body can be held in a manner that covers the lower part of the rotating shaft, so it not only receives water, but also allows the inner surface of the recess to be used as a guide during assembly work, making it easy to work, and the engaging part can be used to prevent blind spots and blind spots. Even so, it can be easily assembled.

(→ Since the rotating shaft is provided with a retaining part on its outer periphery for connecting with the rotating coupling body, it is possible to transmit a powerful rotational torque, and it is possible to realize a highly durable device that is difficult to break down.

(Since the rotating shaft is configured to engage with several protrusions in the recess of the rotating coupling body, a space can be provided between the rotating shaft and the coupling body, so that it does not receive high frequency energy in the cooking cabinet. The heat of the high-temperature rotating shaft is difficult to be transmitted to the connecting body, which means that a heat-insulating structure can be realized, and as a result, the temperature rise of the motor can be reduced, which increases the resistance of the windings and reduces the magnetic force.The rotational torque is attenuated by the ring. etc. can also be prevented.

(6) (As noted in @, the connecting body has a space above and below the rotating shaft, so it is possible to absorb variations in the height dimensions of the main shaft of the motor, the motor mounting body, the rotating connecting body, etc.) Even if the rotational axis of the rotating shaft and the connecting body are not the same, the rotation is transmitted smoothly, using a so-called universal joint configuration, so no unreasonable force is applied to the electric motor. It is possible to use a low-torque motor, which results in energy savings, compactness, and cost reduction.

('7) A continuous protrusion is provided on the outer periphery of the rotary coupling body, which also functions as a foot and reinforcing lip, improving strength and improving durability.

(＠ Since the rotating shaft can be constructed by combining multiple parts, it is possible to select the material that matches the required function.In other words, the parts that require heat resistance and the parts that require mechanical strength can be made of different materials. This makes it easy to achieve high quality and low cost.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional example, Figure 2 is a partial explanatory diagram of the conventional example shown in Figure 1, Figure 3 is a configuration diagram of another conventional example, and Figure 4 is a diagram of the configuration of another conventional example.
The figure is a block diagram of one embodiment of the present invention, FIG. 6 is a detailed view of two parts constituting the rotating shaft, and FIG. 6 is a partially enlarged view of FIG. 4, which also shows the path of the liquid that has flowed out. ing. 1. Electric motor, 4. Cooking cabinet, 6. Rotating table, 7.
・Rotating shaft, 26... ・Rotating coupling body, 26... Engaging portion, 29... Projecting portion, 31... Electric motor mounting body.

Claims (1)

[Claims] (1) A cooking cabinet for heating food, a rotary table that rotates the inside of the cabinet with the food placed thereon, an electric motor that is a drive source for the rotary table, and a motor that is connected to the cooking chamber or the high-frequency heating device itself. The electric motor to be mounted is attached to the body, a rotary shaft that is rotatably provided at a position that passes through a hole provided in the approximate center of the bottom of the cooking cabinet, and a rotary shaft between the two in order to transmit the rotation of the electric motor to the rotary shaft. rotating coupling bodies that are located below the rotational shaft and engage with each other to transmit rotational force, the rotational coupling body being located below the rotational shaft, having four parts corresponding to the size of the rotational shaft, and having a recessed part. Inside is a high-frequency heating device with a rotating shaft and a retaining part to transmit rotational force. (ii) A continuous protrusion is provided on the outer periphery of the recess, and the protrusion has an upward cut, a so-called drain shape, and furthermore, the hole provided in the motor mounting body has a protrusion shape. or in the case of a flat hole, the electric motor is installed below the flat surface as well.