JP4572706B2 - High frequency heating device - Google Patents

Description

The present invention relates to a configuration of a heating chamber of a high-frequency heating device.

In recent high-frequency heating apparatuses, many products have been put on the market that feature steam heating in addition to the convenience of high-frequency heating and the wide cooking range of electric heating. As a method of steam heating, there are a configuration in which a steam generating unit is provided in a heating chamber and a configuration in which steam is filled in a heating chamber by performing high-frequency heating by putting water in a container different from an object to be heated. In the conventional high-frequency heating device, since only the steam generated when the object to be heated is heated, water leakage to the outside of the heating chamber was not a problem, but in recent high-frequency heating devices that actively use steam Since the amount of steam generated in the heating chamber is large, the vapor condenses on the wall surface of the heating chamber, grows and falls to the bottom surface, and the water that falls to the bottom surface enters the joint of the sheet metal that constitutes the heating chamber However, there was a problem that water dropped out of the heating chamber.

  Since this dripping of water occurs at the rear of the product body, it is difficult for the user to notice, so if the product body is placed on a wooden base, the odor of the base due to the dripped water and the growth of various germs such as mold, In addition, even when a table cloth is pasted, it may cause a floating of the cloth, which is not preferable as a product quality.

  As a countermeasure against this, there is one in which a water receiving partition portion is provided at the lower portion of the steam generating portion for the purpose of preventing malfunction of the product due to water dripped out of the heating chamber and preventing an electric shock accident (for example, see Patent Document 1).

  On the other hand, it is common to use a coated steel plate for the sheet metal part which comprises a heating chamber, in order to improve the heat reflective characteristic at the time of electrothermal heating, and to improve the cleaning property of a heating chamber wall surface. Since the coated steel sheet cannot be electrically welded when the coating film is not conductive, mechanical bonding is used as a joining method thereof (see, for example, Patent Document 2).

  According to this invention, two or more sheets of sheet metal parts constituting the heating chamber are superposed and the cutting direction is regulated, so that the cutting and squeezing process is performed together to secure the bonding strength by crimping. At the same time, the joint material can be electrically connected to ensure radio wave sealing performance.

FIG. 8A is a cross-sectional view showing the structure of the mechanical coupling portion of the conventional high-frequency heating apparatus, and FIG. 8B is an enlarged view of the caulking coupling portion in the lower part A of FIG. In the lower part A of the heating chamber 1, four sheets of a heating chamber bottom surface 2, an evaporating dish 3, a heating chamber rear surface wall 4 and a back plate 5 are caulked and joined by mechanical joining. In the caulking coupling portion of the upper part B, the heating chamber upper surface 6, the heating chamber rear wall 4 and the back plate 5 are caulked and bonded by mechanical coupling. In addition, a ceramic tray support 8 for placing an object to be heated whose outer peripheral portion is covered with a silicon rubber sealing material 7 is provided at the front portion of the evaporating dish 3 in a recess in the bottom of the heating chamber. It is attached by press-fitting. Below the evaporating dish 3, an evaporating dish heater 9 is provided for heating the water stored in the evaporating dish 3 into steam. Below the back plate 5 coupled to the heating chamber 1, there is a bottom plate 10. A foot 11 is attached to the bottom plate 10, and is placed on a floor 12.
JP 2004-11974 A Japanese Patent Laid-Open No. 1-1007017

However, in the conventional mechanical joint portion, the heating chamber bottom surface 2, the evaporating dish 3 and the heating chamber rear wall 4 are coupled by crimping caulking while cutting the back plate 5, so that the material of the back plate 5 is partially A cutting part inevitably occurs. On the other hand, when steam heating is performed, moisture condenses and grows on the heating chamber upper surface 6 and the heating chamber rear wall 4 in the heating chamber 1 and flows to the tray tray 8. accumulated water flows into the heating chamber bottom surface 2 above the gap between the sealing member 7, and finally entering the junction C between the flange of the heating chamber bottom surface 2 and the evaporation dish 3 rear. In addition, when water accumulated in the evaporating dish 3 overflows due to some abnormality, or water that is condensed and dripped on the rear wall 4 of the heating chamber enters the joint D of the flange of the evaporating dish 3 and the rear wall 4 of the heating chamber. Moisture that has entered these flange surfaces oozes out from the sheet metal cutting portions E of several mechanical joints provided in the joint, and the water is transferred to the floor 12 where the product body is placed along the outside of the sheet metal. There was a problem of dripping.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a high-frequency heating apparatus that prevents deterioration of product quality by protecting against water leakage outside the heating chamber.

In order to solve the conventional problem, the high-frequency heating device of the present invention is:
A cabinet of the apparatus main body, a heating chamber provided in the cabinet for storing an object to be heated, a door provided to be openable and closable at a front opening of the heating chamber, a side wall of a heating chamber constituting the heating chamber, heating An evaporating dish having a chamber upper surface, a heating chamber bottom surface, a heating chamber rear surface, and a water reservoir recess that generates steam by heating is provided in the heating chamber so as to penetrate the heating chamber bottom surface, and the object to be heated is heated by the steam. An upper mechanical coupling portion that includes a back plate that constitutes a rear surface of the cabinet, a rear flange on the upper surface of the heating chamber, and a flange on the rear wall of the heating chamber , and the heating chamber. comprising a lower mechanical coupling in which the side flanges and the side flanges after said evaporating dish and a flange of the heating chamber after the wall has caulking after the bottom, the said backing plate, said lower mechanical coupling It is arranged so as to cover kite The present invention, wherein this water seeping from the lower mechanical coupling by can prevent dripping of water into the apparatus body outside are covered on the back plate.

  According to the high-frequency heating device of the present invention, moisture in the heating chamber permeates into the joint between the rear wall of the heating chamber and the flange on the bottom of the heating chamber, and water is supplied from the cutting portion of the sheet metal of the mechanical joint provided between the joints. Since the back plate is provided so as to cover the cut part even if it is outside, the water oozed out from the cut part of the sheet metal of the mechanical coupling part is transferred to the inner face of the back plate and collected on the bottom plate. No water drops on the floor where the product is installed, and product quality is not impaired. In addition, since the upper side of the back plate is mechanically coupled simultaneously with the upper surface of the heating chamber and the rear wall of the heating chamber, the assembly time can be finished without much difference by using a conventional heating chamber assembly facility.

The first invention is
A cabinet of the apparatus main body, a heating chamber provided in the cabinet for storing an object to be heated, a door provided to be openable and closable at a front opening of the heating chamber, a side wall of a heating chamber constituting the heating chamber, heating chamber upper surface, heating the heating chamber bottom surface, and a heating chamber rear, an object to be heated by the steam provided evaporating dish having a water storing recess that generates steam through the heating chamber bottom surface in the heating chamber by heating An upper mechanical coupling portion that includes a back plate that constitutes a rear surface of the cabinet, a rear flange on the upper surface of the heating chamber, and a flange on the rear wall of the heating chamber , and the heating chamber. comprising a lower mechanical coupling in which the side flanges and the side flanges after said evaporating dish and a flange of the heating chamber after the wall has caulking after the bottom, the said backing plate, said lower mechanical coupling Also arranged to cover It is. Thereby, since the water which oozed out from the mechanical coupling part is covered with the back plate, dripping of the water outside the apparatus main body can be prevented.

The second invention, the back plate, have a convex screw hole at a position opposite to the mechanical coupling, and a space is provided between the threaded hole and the mechanical coupling of the back plate Is. Thereby, the water which oozes out from the mechanical coupling part is collected in the convex part of the screw hole, and dripping of water outside the apparatus main body can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
2 is a front view showing a state in which the open / close door of the high-frequency heating apparatus according to one embodiment of the present invention is opened, FIG. 3 is a cross-sectional view of the high-frequency heating apparatus viewed from the front, and FIG. 4 is used in this apparatus. FIG. 6A is a perspective view showing the configuration of the heating chamber 1, FIG. 6B is an exploded perspective view showing the configuration of the heating chamber, and FIG. FIG. 1 is a partial perspective view showing a combined state of steam generating parts in the heating chamber, and FIG. 1 is a cross-sectional view showing the structure of the evaporating dish, the evaporating dish superheater, and the rear surface of the apparatus.

  The high-frequency heating device main body 20 is provided with a heating chamber 1 having an open front surface. A door 21 that prevents the front surface of the heating chamber 1 is openable and closable on the front surface of the main body, and various operation keys 22a for a user to select a cooking menu or give instructions to start cooking and necessary displays. An operation panel 22 having a display unit 22b for performing is provided. The heating chamber 1 is provided with an evaporating dish 3 for generating steam and a nozzle 23 for supplying water to the evaporating dish 3. A magnetron 24 for oscillating microwaves is provided in the high-frequency heating device main body 20, and microwaves are supplied into the heating chamber 1 from a power supply port 26 provided on the bottom surface of the main body via a waveguide 25. It is like that.

FIG. 4 is a perspective view of the evaporating dish 3 having a water reservoir recess for heating the supplied water, which is a part of the steam generating section, and generating steam. As shown in FIG. 4, the evaporating dish 3 is formed by molding a steel plate. On the outer periphery of the evaporating dish 3 , a heating chamber side wall (not shown) constituting the heating chamber, the heating chamber bottom surface 2, a flange-shaped coupling portion a27 for coupling with the coupling portion of the heating chamber rear wall 4, and coupling A part b28 and a coupling part c29 are provided. In the evaporating dish 3, there are gaps 30 at both ends in contact with the heating chamber rear wall 4 due to the restriction of forming a steel plate.

As shown in FIG. 1, the evaporating dish 3 which is a part of the steam generating part is coupled to the heating chamber bottom surface 2 by the coupling part b28 and the heating chamber rear surface wall 4 by the coupling part c29. Since the bonding is performed by caulking, the water tightness of the bonding surface is not perfect. At the front part of the evaporating dish 3, a ceramic dish receiving base 8 for placing an object to be heated whose outer peripheral part is covered with a sealing material 7 made of silicon rubber is press-fitted into the recessed part of the bottom surface 2 of the heating chamber. It is attached by. Below the evaporating dish 3, there is provided an evaporating dish heater 9 for heating the water stored in the evaporating dish 3 into steam. Below the back plate 5 coupled to the heating chamber 1, there is a bottom plate 10. A foot 11 is attached to the bottom plate 10 and is placed on the floor 12.

  FIG. 5 is a left side view illustrating a water supply configuration to the evaporating dish 3 with the case (cabinet), the door 21, the bottom plate 10 and the like of the apparatus main body removed. In FIG. 5, a tank that shields and insulates heat from the side wall 31 of the heating chamber is provided inside the rear wall 4 of the heating chamber 4, the side wall 31 of the heating chamber, and the door plate 32 that faces the door 21. A case 33 is provided. Inside the tank case 33, there is a tank 34 for storing water. The water in the tank 34 is supplied through a tube 36 by a pump 35, led into the heating chamber 1 through the nozzle 23, and reaches the evaporating dish 3.

  The steam heating of the high-frequency heating apparatus configured as described above and the flow of water to the outside of the heating chamber 1 due to condensation of the generated steam will be described.

First, when an object to be heated is stored in the heating chamber 1 and steam heating is set from the operation unit 22a, water stored in the tank 34 is pumped by the tube 35 and nozzles by the control base (not shown). Through 23, water is supplied to the evaporating dish 3 in the heating chamber 1. Next, the evaporating dish heater 9 is operated to centrally heat the water reservoir recess of the evaporating dish 3 to generate steam. By combining high-frequency heating or electric heating according to the set heating pattern, the object to be heated can be heated to an optimum state. The supersaturated steam determined according to the temperature in the heating chamber 1 is condensed and grows inside the upper surface 6, the rear surface 4, and the heating chamber side wall 31 in the heating chamber 1, and drops the wall surface. Since the dripped water is collected on the pan receiving table 8 by the silicon rubber sealing material 7 provided on the bottom surface of the heating chamber 1, the water does not normally drop outside the heating chamber 1, but the sealing material 7 is deteriorated. the water accumulated on the pan support base 8 a gap is generated flows into the heating chamber bottom 2 above, eventually entering the junction H of the flange of the heating chamber bottom surface 2 and the evaporation dish 3 rear by such become.

  Further, the water dropped on the rear wall 4 of the heating chamber enters the joining portion c29 of the evaporating dish 3 and the mating portion G of the rear wall 4 of the heating chamber. The both ends of the evaporating dish 3 have a gap 30 as shown in FIG. 7 due to the restriction of the steel plate processing, and the amount of water that enters the mating part G increases when dropped on this part.

  Further, when the control of the pump 35 or the like malfunctions and the water is supercharged and the evaporating dish 3 overflows, the amount of water entering the mating part G increases.

  In the present embodiment, a part of the water that has entered the mating portion G appears between the heating chamber rear wall 4 and the back plate 5 so as to ooze out from the sheet metal cutting portion I of the mechanical coupling portion. Never go out of the main body.

  That is, after the heating chamber bottom surface 2, the evaporating dish 3, and the heating chamber rear wall 4 are mechanically coupled first, the back plate 5 is installed, and the heating chamber rear wall 4, the heating chamber upper surface 6 and the back plate 5 are mechanically coupled. Since the water that has condensed and grown on the rear wall 4 of the heating chamber drops into the mating surface with the evaporating dish 3, the sheet metal is cut by mechanical coupling on the heating chamber bottom 2 side of the back plate 5. Since there is no surface, water does not ooze out to the outside of the back plate 5 and accumulates on the bottom plate 10 along the inside, so that no water can be accumulated on the floor surface 12 on which the product is installed.

  Therefore, it is possible to prevent a problem caused by the accumulation of water on the table on which the product is placed or on the dedicated stand.

  The number of the mechanical couplings on the rear surface of the heating chamber is such that the lower side is the heating chamber bottom surface 2, the evaporating dish 3, and the heating chamber rear surface wall 4, and the upper side is the heating chamber upper surface 6, the heating chamber rear surface wall 4, and the back plate 5. Since there are three sheets and the conditions of the caulking tool for mechanical coupling can be set to the same setting, production efficiency and stable manufacturing can be achieved.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that the description of the same or equivalent parts as those in the first embodiment is omitted or simplified.

  A flange on the bottom surface 2 of the heating chamber constituting the heating chamber and a part of the rear wall 4 of the heating chamber are mechanically coupled, and a back plate 5 having a convex screw hole 13 is disposed so as to cover the mechanical coupling portion. A convex screw hole 13 is arranged at a position facing the mechanical coupling portion.

  In the present embodiment, a portion of the water that has entered the mating portion G oozes out from the sheet metal cutting portion I of the mechanical coupling portion, and between the convex screw hole 13 of the back plate 5 and the heating chamber rear wall 4. However, it does not go out of the main body as in the conventional case.

  That is, after the heating chamber bottom surface 2, the evaporating dish 3, and the heating chamber rear wall 4 are mechanically coupled first, the back plate 5 is disposed so that the convex screw holes 13 are arranged at positions facing the mechanical coupling portion. Since it is configured to be screwed, water that has condensed and grown on the rear wall 4 of the heating chamber enters the mating surface with the evaporating dish 3, but the convex portions of the screw holes 13 of the back plate 5 accumulate water. Therefore, since water does not ooze out to the outside of the back plate 5 and accumulates on the bottom plate 10 through the inside, water cannot be accumulated on the floor surface 12 on which the product is installed.

  As described above, according to the high-frequency heating device according to the present invention, the saturated water vapor generated in the heating chamber during normal operation is condensed and dripped on the rear surface of the heating chamber, and enters the junction between the rear wall of the heating chamber and the evaporating dish. Even if the water is stained from the cut surface of the sheet metal of the mechanical joint, the back plate is installed so as to cover the joint, thereby preventing deterioration of the product quality such that water spills out of the main body of the device. .

(A) Cross-sectional view showing the structure of the rear part of the high-frequency heating device in Embodiment 1 of the present invention (b) Enlarged view of the mechanical coupling portion in Embodiment 1 of the present invention Configuration diagram of the main body of the high-frequency heating device Sectional view seen from the front of the high-frequency heating device The perspective view which looked at the evaporation pan of the steam generation part from the front and back in the high frequency heating device The left view which shows the water supply structure to the evaporating dish of the steam generation part in Embodiment 1 of this invention (A) Perspective view showing the configuration of the heating chamber (b) Rear exploded perspective view showing the configuration of the heating chamber Partial perspective view which shows the combined state of the steam generation part in the heating chamber (A) Cross-sectional view showing the structure of the rear part of a conventional high-frequency heating device (b) Enlarged view of the mechanical coupling part The enlarged view of the mechanical coupling part in Embodiment 2 of this invention

1 Heating chamber 2 Heating chamber bottom 3 Evaporating dish (steam generating part)
4 Rear wall of heating chamber 5 Back plate 6 Upper surface of heating chamber

Claims (2)

A cabinet of the apparatus main body, a heating chamber provided in the cabinet for storing an object to be heated, a door provided to be openable and closable at a front opening of the heating chamber, a side wall of a heating chamber constituting the heating chamber, heating chamber upper surface, heating the heating chamber bottom surface, and a heating chamber rear, an object to be heated by the steam provided evaporating dish having a water storing recess that generates steam through the heating chamber bottom surface in the heating chamber by heating A steam generator ,
An upper mechanical coupling portion in which a back plate constituting the rear surface of the cabinet, a rear flange on the upper surface of the heating chamber, and a flange on the rear wall of the heating chamber are caulked, a rear flange on the bottom surface of the heating chamber and the evaporating dish and a lower mechanical coupling that caulking side flange and a flange of wall after the heating chamber after, the back plate is disposed so as to cover the lower mechanical coupling high frequency heating apparatus . Claims wherein the backing plate, have a convex screw hole at a position opposite to the mechanical coupling, and providing a space between the screw hole and the mechanical coupling of the back plate The high-frequency heating device according to 1.

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