WO2010116717A1

WO2010116717A1 - High-frequency heating device with vapor generating function

Info

Publication number: WO2010116717A1
Application number: PCT/JP2010/002500
Authority: WO
Inventors: 西朗見; 早川雄二; 明石孝之
Original assignee: パナソニック株式会社
Priority date: 2009-04-06
Filing date: 2010-04-06
Publication date: 2010-10-14
Also published as: CN102365496B; EP2407722A4; JP2010261695A; CN102365496A; EP2407722A1

Abstract

Left and right side walls (29) of a metallic heating chamber (23) for containing an object to be heated and a bottom wall (31) of the heating chamber (23) are integrated with one another without a seam. Since there is no joint between the side walls (29) and the bottom wall (31), no seal is required. This facilitates manufacturing. Also, since there is no joint, even if water spills from an evaporation tray (27) or water and oil contents are generated from the object being heated, the water and oil do not leak into an electricity supply chamber (25), and as a result, a failure is prevented from occurring.

Description

High-frequency heating device with steam generation function

The present invention relates to a high-frequency heating device with a steam generation function.

An example of a conventional high-frequency heating device with a steam generation function is shown in FIGS. 7 and 8, a microwave oven 1 that is a high-frequency heating device has a substantially rectangular parallelepiped chassis 2 made of a metal plate, a heating chamber 3 having an opening on the front surface, and a door 4 that opens and closes the opening.

In the heating chamber 3, the five wall surfaces excluding the openings are composed of metal plates. A recess (not shown) is formed in the bottom wall of the heating chamber 3. The space in the recess is the power supply chamber 5. A partition plate 6 is attached to the opening of the power supply chamber 5, that is, the opening of the recess formed in the bottom wall of the heating chamber 3. That is, the heating chamber 3 and the power supply chamber 5 provided adjacently below the heating chamber 3 are partitioned by the partition plate 6. The partition plate 6 is formed of a material that transmits high-frequency energy. The partition plate 6 is made of, for example, glass or ceramic.

In the power supply chamber 5, a metal stirring blade (not shown) is rotatably supported by a motor (not shown). The stirring blade functions as a high-frequency antenna and distributes high-frequency energy uniformly. The microwave oven 1 has a magnetron (not shown) that constitutes a high-frequency generator outside the side wall surface of the heating chamber 3. The microwave oven 1 also has a cooling fan (not shown) for cooling the heat generated during operation of the magnetron and the power supply circuit components that supply power to the magnetron.

Next, the operation of the microwave oven 1 will be described. First, the user of the microwave oven 1 places an object to be heated on the partition plate 6 in the heating chamber 3, and then operates an operation panel (not shown) provided at the lower part of the door 4. . As a result, high-frequency radio waves are generated from the magnetron. The high frequency radio wave propagates through a waveguide (not shown) and is introduced into the power supply chamber 5. The high frequency radio wave introduced into the power supply chamber 5 is dispersed by the stirring blade (antenna), passes through the partition plate 6, is absorbed by the object to be heated, and is converted into heat.

On the bottom surface of the heating chamber 3, a partition plate 6 is provided on the opening side, and a steam generation unit 11 is provided on the back side in contact with each other. The steam generation unit 11 is provided with an evaporating dish 8 for heating and evaporating water supplied from the outside of the heating chamber 3.

The left and right side walls 7 and the evaporating dish 8 of the heating chamber 3 and the joint 9 between the power supply chamber 5 are at the same position or lower than the partition plate 6. For this reason, when the user of the microwave oven 1 puts or removes the object to be heated from the heating chamber 3 or during heating of the object to be heated, moisture or oil content of the object to be heated may spill or scatter. . If moisture or oil flows downward from the gap between the partition plate 6 and the wall surface of the heating chamber 3, that is, into the power supply chamber 5, components such as a stirring blade (antenna) and a motor may break down.

In order to prevent such inconvenience, there was a configuration in which a gap between the partition plate 6 and the wall surface of the heating chamber 3 was sealed in a water-tight manner (for example, see Patent Document 1). Referring to FIG. 8, after placing the partition plate 6 in the heating chamber 3, the gap between the joint portions 9 over the entire circumference of the partition plate 6 is filled with a sealing material 10 having adhesiveness such as silicon rubber, There was a configuration for fixing the partition plate 6. However, in such a configuration in which the gap between the partition plate 6 and the wall surface of the heating chamber 3 is filled with the sealing material 10 and the partition plate 6 is fixed, the partition plate 6 cannot be removed. For this reason, when repairing, it is necessary to destroy the partition plate 6 or cut off the sealing material 10. That is, replacement parts are required for repair, and a long time is required for repair work.

In addition, since the power feeding chamber 5 and the evaporating dish 8 are composed of different parts, a gap is likely to occur at the joint portion 9 between the parts constituting the power feeding chamber 5 and the parts constituting the evaporating dish 8. For this reason, when water is supplied until cooking is completed, or when cooking using steam is started immediately after cooking is started using steam, cooking using steam again is started. In some cases, the supply of water was excessive and water overflowed from the evaporating dish 8. The water overflowing from the evaporating dish 8 enters the power supply chamber 5 through the joint 9 between the evaporating dish 8 and the partition plate 6. Thereby, when sparks are generated from components such as a stirring blade (antenna) and a motor, a failure may occur.

In order to prevent such inconvenience, it is necessary to seal the joint 9. However, applying the seal complicates the configuration. That is, the workability in assembling deteriorates, or the number of assembling work and the parts cost increase due to the increase in the number of parts.

JP 2008-224078 A

The present invention provides a high-frequency heating apparatus with a steam generation function that is easy to manufacture and that can prevent a failure due to leakage of moisture and oil from an evaporating dish or a heated object.

The high-frequency heating apparatus with a steam generation function of the present invention includes an opening on the front surface, a metal heating chamber that accommodates an object to be heated, and a door that opens and closes the opening of the heating chamber. Further, the high-frequency heating device with a steam generation function of the present invention is provided adjacent to the lower portion of the heating chamber, closes the opening of the power supply chamber having an opening on the upper side, and partitions the heating chamber and the power supply chamber, And a partition plate on which the object to be heated is placed. The high-frequency heating device with a steam generation function of the present invention includes an evaporating dish formed in a heating chamber and a high-frequency generator that generates high-frequency radio waves. Moreover, the high frequency heating apparatus with a steam generation function of the present invention integrally forms the left and right side walls of the heating chamber and the bottom wall of the heating chamber without a joint.

With this configuration, there is no joint between the left and right side walls of the heating chamber and the bottom wall of the heating chamber, and no seal is required. Thereby, manufacture becomes easy. In addition, since there is no junction, water and oil do not leak into the power supply chamber even if water overflows from the evaporating dish or moisture or oil is generated from the heated object, preventing malfunction. can do.

FIG. 1 is a front perspective view of a high-frequency heating device with a steam generation function in Embodiment 1 of the present invention. FIG. 2 is a front perspective view in which a partition plate is attached to the high-frequency heating device with a steam generation function in the same embodiment. FIG. 3A is a perspective view showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber. FIG. 3B is a perspective view showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber. FIG. 4A is a perspective view showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber of the high-frequency heating device with a steam generating function in Embodiment 2 of the present invention. FIG. 4B is a perspective view showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber of the high-frequency heating device with a steam generating function in Embodiment 2 of the present invention. FIG. 5 is an enlarged perspective view of a portion A in FIG. 4B. FIG. 6 is an exploded perspective view of the heating chamber. FIG. 7 is a front perspective view of a conventional high-frequency heating device with a steam generation function. FIG. 8 is a perspective view of the bottom wall of the heating chamber of the conventional high-frequency heating apparatus with a steam generating function.

(Embodiment 1)
FIG. 1 is a front perspective view of a high-frequency heating device with a steam generation function in Embodiment 1 of the present invention. FIG. 2 is a front perspective view in which a partition plate is attached to the high-frequency heating device with a steam generation function in the same embodiment. 3A and 3B are perspective views showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber.

1 and 2, a microwave oven 21 that is a high-frequency heating device with a steam generation function includes a chassis 22 as a main body. A metal heating chamber 23 is formed in the chassis 22. The heating chamber 23 has an opening on the front surface and is pivotally supported so that the door 24 can be opened and closed. A recess (not shown) is formed in the bottom wall 31 of the heating chamber 23. A space in the recess is a power supply chamber 25. That is, the power supply chamber 25 is provided adjacent to the heating chamber 23.

Since the power supply chamber 25 is concave, it has a bottom surface and side surfaces. The partition plate 26 is detachably attached so as to close the opening of the power supply chamber 25. In other words, the partition plate 26 partitions the power supply chamber 25 and the heating chamber 23 provided adjacent to each other. The partition plate 26 is formed of a material that transmits high-frequency energy such as glass or ceramic.

A substantially H-shaped recess is formed on the bottom surface of the power supply chamber 25 in plan view. The H-shaped recess is symmetrical. By making the shape of the power supply chamber 25 bilaterally symmetric, the distribution of high-frequency radio waves in the power supply chamber 25 and the heating chamber 23 can be improved. On the other hand, a magnetron 100 constituting a high-frequency generator is attached below the power supply chamber 25, that is, outside the bottom surface of the power supply chamber 25. Here, the H-shaped concave portion on the bottom surface of the power supply chamber 25 is configured to protrude below the power supply chamber 25. The height of the bottom surface of the heating chamber 23 can be reduced by disposing parts such as the magnetron 100 below the power supply chamber 25 and in portions other than the H-shaped recess. Furthermore, the overall height of the microwave oven 21 can be suppressed.

In the power supply chamber 25, a metal stirring blade (not shown) is rotatably supported by a motor (not shown). The stirring blade functions as a high-frequency antenna and distributes high-frequency energy uniformly. High frequency radio waves generated from the magnetron 100 propagate through a waveguide (not shown) and are introduced into the power supply chamber 25. The high frequency radio wave introduced into the power supply chamber 25 is dispersed by the stirring blade (antenna), passes through the partition plate 26, is absorbed by the object to be heated, and is converted into heat. Thereby, a to-be-heated material is heated.

An evaporating dish 27 that heats and evaporates water supplied from the outside of the heating chamber 23 is formed on the bottom surface of the heating chamber 23 and on the back side of the power supply chamber 25. The evaporating dish 27 has a concave shape for storing water, and is formed on the bottom wall 31 of the heating chamber 23.

The left and right side walls 29 and the bottom wall 31 of the heating chamber 23 are formed by processing one metal plate as shown in FIGS. 3A and 3B. As a result, the peripheral portion of the opening of the power supply chamber 25 and the peripheral portion of the evaporating dish 27 are integrally provided seamlessly. The left and right end portions of the bottom wall 31 of the heating chamber 23 bend upward and extend from a curved surface portion 28 formed in a corner portion near the left and right side walls 29 of the heating chamber 23, and the left and right side walls 29 of the heating chamber 23. It leads to. The curved surface portion 28 has, for example, an arc shape.

The left and right side walls 29 and the bottom wall 31 of the heating chamber 23 shown in FIG. 3A are formed by bending the left and right of one metal plate shown in FIG. 3B. The arrow in FIG. 3A indicates the bending direction. The metal plate is, for example, a precoated steel plate. Pre-coated steel sheet is bent and processed by a press. Thereby, the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23 are formed integrally with each other through the curved surface portion 28. Note that a perforation 101 extending in the depth direction of the heating chamber 23 is provided in the upper portion of the curved surface portion 28, that is, in the bent portion 30 serving as a fold line. The precoated steel sheet is bent along the perforation 101. That is, the left and right side walls 29 and the bottom wall 31 of the heating chamber 23 are connected by the bent portion 30.

Here, the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23 are formed via the curved surface portion 28. Since the curved surface portion 28 has an arc shape, for example, the bent portion 30 between the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23 is provided at a position higher than the evaporating dish 27.

The top wall (not shown) and the back wall (not shown) constituting the ceiling of the heating chamber 23 are integrally formed in the same manner as the side wall 29 and the bottom wall 31 described above. In other words, the steel plates that make up the top wall and the back wall are squeezed by pressing, cut and perforated, attached with accessories such as a heater cover, and painted with a self-cleaning effect. , Folded. In this way, the top wall and the back wall are integrally formed. The heating chamber 23 is configured by joining the integrally formed side wall 29 and bottom wall 31 to the integrally formed top wall and back wall. In addition, about the steel plate which forms a ceiling wall and a back wall integrally, although the case where it coats after press work was demonstrated, the precoat steel plate can be used similarly to the side wall 29 and the bottom wall 31. FIG.

The operation and action of the high-frequency heating apparatus with a steam generation function configured as described above will be described. A user of the microwave oven 21 places an object to be heated on the partition plate 26 in the heating chamber 23, and then operates an operation panel (not shown) provided at the lower part of the door 24. As a result, high-frequency radio waves are generated from the magnetron 100. The high frequency radio wave propagates through a waveguide (not shown) and is introduced into the power supply chamber 25. The high frequency radio wave introduced into the power supply chamber 25 is dispersed by the stirring blade (antenna), passes through the partition plate 26, and is absorbed by the object to be heated. Thereby, a to-be-heated material is heated and cooked.

Here, when cooking using steam is started, water is supplied from the outside of the heating chamber 23 to the evaporating dish 27 of the heating chamber 23. The water stored in the evaporating dish 27 is heated by a heater (not shown) or a high-frequency radio wave to become steam. In addition, water is dielectrically heated by using high-frequency radio waves in the 2450 MHz band, and steam is generated.

When water is supplied until cooking is completed, or when cooking using steam is started immediately after cooking is started using steam, water is supplied to the evaporating dish 27 when cooking using steam is started again. It may become excessive and water may overflow from the evaporating dish 27. Here, the microwave oven 21 of the present embodiment has joints between the evaporating dish 27 and the partition plate 26 and between the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23. do not do. That is, even if water overflows from the evaporating dish 27, water does not enter the power supply chamber 25. Similarly, water and oil scattered from the object to be heated do not enter the power supply chamber 25. Thereby, the occurrence of sparks from components such as a stirring blade (antenna) and a motor is suppressed, and the possibility of failure is reduced.

Further, the bent portion 30 between the left and right side walls 29 of the heating chamber 23 and the power supply chamber 25 is provided at a position higher than the evaporating dish 27. Thereby, even when the water accumulated in the evaporating dish 27 overflows or when a large amount of water or oil flows out of the heated object, there is a possibility that water or oil may leak from the perforation of the bent portion 30. Low.

Furthermore, a corner portion in the vicinity of the bent portion 30 between the left and right side walls 29 of the heating chamber 23 and the power supply chamber 25 is an arc-shaped curved surface portion 28. Thereby, it is difficult for dust to collect on the curved surface portion 28. Further, even when dust accumulates on the curved surface portion 28, the curved surface portion 28 has an arc shape, so that it is easy to remove dust. That is, the heating chamber 23 can be easily cleaned, and the inside of the heating chamber 23 can be kept clean.

As described above, the microwave oven 21 according to the present embodiment includes the junction between the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23, and the junction between the evaporating dish 27 and the power supply chamber 25. No. That is, the left and right side walls 29 of the heating chamber 23 and the bottom wall 31 of the heating chamber 23 are integrally formed without a seam. Further, the peripheral edge of the evaporating dish 27 and the peripheral edge of the power supply chamber 25 are integrally formed without a seam. Thereby, in the microwave oven 21 of this Embodiment, the sealing components and sealing operation | work required in the conventional microwave oven become unnecessary. Therefore, the structure is simplified, and the manufacturing is facilitated by reducing the number of parts. That is, productivity is improved. In addition, in the microwave oven 21 of the present embodiment, moisture and oil are prevented from entering the power supply chamber 25 and below the power supply chamber 25. Thereby, in the microwave oven 21 of this Embodiment, failure of components, such as a stirring blade and a motor, is prevented.

Also, as described above, by eliminating the joining portion of the heating chamber 23, it is possible to eliminate radio wave leakage and hot air leakage from the joining portion. Further, as described above, by integrally configuring the heating chamber 23 without a joint, the strength of the heating chamber 23 is improved and the reliability is improved.

(Embodiment 2)
4A and 4B are perspective views showing an assembled state of the left and right side walls of the heating chamber and the bottom wall of the heating chamber of the high-frequency heating device with a steam generation function in Embodiment 2 of the present invention. FIG. 5 is an enlarged perspective view of a portion A in FIG. 4B. FIG. 6 is an exploded perspective view of the heating chamber. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The left and right side walls 42 and the bottom wall 45 of the heating chamber 23 shown in FIG. 4A are formed by bending the left and right of one metal plate shown in FIG. 4B. The arrow in FIG. 4A indicates the bending direction. That is, the heating chamber 23 is configured by folding the lower end portion 44 of the side wall 42 and the left and right end portions 46 of the bottom wall 45. This folded portion is the folded portion 40.

As shown in FIG. 5, a plurality of holes 48 are formed in the bent portion 49 at a predetermined interval. The hole 48 has a substantially isosceles trapezoidal shape and is formed by pressing. The dimension in the longitudinal direction of the holes 48 and the interval between adjacent holes 48 are determined based on the ease of manual folding when the folded portion 40 is produced.

That is, when the dimension in the longitudinal direction of the holes 48 is lengthened or the interval between the holes 48 is shortened, the bending process can be performed with a small force when the folded portion 40 is produced. On the contrary, if the longitudinal dimension of the holes 48 is shortened or the interval between the holes 48 is increased, a large force is required for the bending process. That is, by adjusting the longitudinal dimension of the holes 48 and the interval between the holes 48, the force required to form the folded portion 40 can be adjusted.

However, if the longitudinal dimension of the holes 48 is too long, or if the distance between the holes 48 is too short, the strength of the folded portion 40 decreases. Thereby, the folding part 40 may be cut | disconnected. Even if the cutting does not occur, a gap may occur. From this gap, liquids such as steam and juice from food in the heating chamber 23 may enter and rust may be generated. Accordingly, it is necessary to appropriately determine the longitudinal dimension of the holes 48 and the interval between the holes 48. For example, when a pre-coated steel plate having a thickness of 0.5 mm is used, the dimensions of the hole 48 having an isosceles trapezoidal shape are 7 to 20 mm for the upper base and 2 to 9 to 22 mm for the lower base (the lower base is 2 mm longer than the upper base). Set), the height can be 1.5 mm and the spacing can be 3.7 mm.

Regarding the high-frequency heating apparatus with a steam generation function configured as described above, a method for manufacturing a heating chamber will be described. First, by pressing, the left and right side walls 42 of the heating chamber 23 and the bottom wall 45 of the heating chamber 23 are integrally formed from a single precoated steel plate without a seam. Further, an isosceles trapezoidal hole 48 is formed in the bent portion 49 between the side wall 42 and the bottom wall 45. The hole 48 is formed in a straight line so that the long side is along the bending direction. The pre-coated steel sheet is bent at approximately 90 degrees with the long side of the hole 48 as a fold line.

As shown in FIG. 6, the top wall 50 of the heating chamber 23 and the back wall 51 of the heating chamber 23 are integrally formed without a seam, similarly to the side wall 42 and the bottom wall 45. A folded portion formed by folding the top wall 50 and the back wall 51 is a folded portion 52. The heating chamber 23 having an opening on the front surface is manufactured by combining the side wall 42 and the bottom wall 45, the top wall 50, and the back wall 51 formed in this way.

As described above, according to the present embodiment, the lower end portions 44 of the left and right side walls 42 of the heating chamber 23 and the left and right end portions 46 of the bottom wall 45 of the heating chamber 23 are folded, The strength of the heating chamber 23 is improved. Further, the lower end portions 44 of the left and right side walls 42 of the heating chamber 23 and the left and right end portions 46 of the bottom wall 45 of the heating chamber 23 are connected by bent portions 49, respectively. A plurality of holes 48 are formed in the bent portion 49 at predetermined intervals. Thereby, the bending process can be performed manually without using a jig. In this way, the heating chamber 23 can be manufactured manually. That is, it can manufacture without using a press machine, and productivity improves.

Further, the folded portion 40 between the lower end portions 44 of the left and right side walls 42 of the heating chamber 23 and the left and right end portions 46 of the bottom wall 45 of the heating chamber 23 is formed by caulking. Thereby, the strength of the heating chamber 23 is improved, and leakage of radio waves and hot air from the holes 48 is prevented. That is, the reliability and cooking performance of the microwave oven 21 are improved.

Furthermore, since the left and right side walls 42 and the bottom wall 45 are composed of a single part, material loss is reduced compared to when the left and right side walls 42 and the bottom wall 45 are pressed as separate parts. Further, since the left and right side walls 42 and the bottom wall 45 are connected by the bent portion 49, the strength between the left and right side walls 42 and the bottom wall 45 is improved, and the left and right side walls 42 and the bottom wall 45 are The leakage of radio waves from the gap is reduced.

In the present embodiment, the hole 48 having an isosceles trapezoidal shape is used, but a hole 48 having a rectangular shape may be used. The hole 48 having a rectangular shape is used in a place where the bending accuracy may be low. For example, the folded portion 52 between the top wall 50 and the back wall 51 of the heating chamber 23 is difficult to see from the user who uses the microwave oven 21. Therefore, a hole 48 having a rectangular shape can be used. For example, when a pre-coated steel plate having a thickness of 0.5 mm is used, the dimension of the hole 48 having a rectangular shape can be 1.5 mm on the short side and 4.5 mm to 11 mm on the long side.

As described above, the present invention can prevent leakage of moisture and oil from the heating chamber with a simple configuration. Therefore, it can be used for a cooking device in which moisture or oil is generated from the object to be heated.

21 Microwave oven (high-frequency heating device with steam generation function)
22 Chassis 23 Heating chamber 24 Door 25 Power feeding chamber 26 Partition plate 27 Evaporating dish 28

Curved portion

29, 42

Side wall

30, 49 Folded

portion

31, 45

Bottom wall

40, 52 Folded portion 44 Lower end portion 46 End portion 48 Hole 50 Top Wall 51 Back wall 100 Magnetron (high frequency generator)
101 perforation

Claims

A metal heating chamber having an opening on the front surface and containing an object to be heated;
A door for opening and closing the opening of the heating chamber;
A power supply chamber provided adjacent to the lower side of the heating chamber and having an opening on the upper side;
A partition plate for closing the opening of the power supply chamber, partitioning the heating chamber and the power supply chamber, and placing the object to be heated;
An evaporating dish formed in the heating chamber;
A high frequency generator provided outside the heating chamber and generating high frequency radio waves,
A high-frequency heating apparatus with a steam generating function, in which left and right side walls of the heating chamber and a bottom wall of the heating chamber are integrally formed without a seam.
The high frequency heating apparatus with a steam generating function according to claim 1, wherein the side wall and the bottom wall are connected by a bent portion, and a perforation is formed in the bent portion.
The high frequency heating apparatus with a steam generation function according to claim 1, wherein a curved surface portion is formed at a corner portion between the side wall and the bottom wall.
The high frequency heating apparatus with a steam generation function according to claim 1, wherein a peripheral edge of the evaporating dish and a peripheral edge of the opening of the power supply chamber are integrally formed without a seam.
The high frequency heating apparatus with a steam generating function according to claim 1, further comprising a folding portion that folds the lower end portion of the side wall and the left and right end portions of the bottom wall.
6. The high frequency with steam generating function according to claim 5, wherein a lower end portion of the side wall and left and right end portions of the bottom wall are connected by a bent portion, and holes are formed in the bent portion at a predetermined interval. Heating device.
The high frequency heating apparatus with a steam generating function according to claim 5, wherein the folded portion of the lower end portion of the side wall and the left and right end portions of the bottom wall is formed by caulking.