JP2011085307A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption in use by reducing heat leakage from a door for taking in and out foods from a heating chamber. <P>SOLUTION: In this heating cooker including the door 2 for taking in and out foods to the heating chamber 3, the door 2 is configured by disposing an inner glass sheet 24 on a heating chamber 3 side, disposing an intermediate glass sheet 23 on a front side of the inner glass sheet 24 while keeping a constant clearance gap to the inner glass sheet 24, and covering the circumference of the intermediate glass sheet 23 and the inner glass sheet 24 by a door base 20 to form a sealed space 25 in the clearance gap, the door base 20 includes a choke structure 201 composed of approximately combteeth-like conductor pieces 2010, on an outer side of the circumference of the inner glass sheet 24 and the intermediate glass sheet 23, a check valve 205 is disposed on the door base 20 positioned in the clearance gap between the approximately combteeth-like conductor pieces 2010 to allow the air to flow only from the inside to the outside of the sealed space 25, and the air in the clearance gap is sucked through the check valve 205 to form the vacuum sealed space 25. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooking device such as a microwave oven that generates microwaves and a microwave oven equipped with a heater as a heating means for heating food.

  Conventionally, in a cooking device such as a microwave oven, attempts have been made to reduce power consumption during cooking by insulating the heat inside the heating chamber so as not to escape to the outside. For example, a structure that makes it difficult for heat inside the heating chamber to escape to the outside by disposing a heat-resistant material such as glass wool on the outer periphery of the heating chamber is generally used.

  However, the door part that checks the internal situation from the outside of the heating cooker needs to be transparent in order to maintain the internal visibility, and since heat insulating materials such as glass wool cannot be arranged, Insulation performance was lower than that.

  Moreover, the surface temperature of the door is increased, which may impair the safety and operability of the user.

  Therefore, a structure for insulating the door portion has been proposed as follows.

  Patent Document 1 describes a heating cooker in which a vacuum heat insulating layer made of two glasses, a front glass and a rear glass, is provided in a door to increase the heat insulating performance of the door and reduce power consumption.

  The heating cooker has a structure in which a spacer is provided between two glass plates to form a space, and a vacuum layer is provided inside the door by discharging air inside the space. The vacuum layer is formed by discharging air between two glass plates from a valve provided on the glass surface.

  Further, in Patent Document 2, the space between the inner window and the outer window of the door is configured by a plurality of heat insulating space layers divided into thicknesses that prevent air from convection, and air convection between the heat insulating air layers is provided. It is a heating cooker that suppresses the amount of heat released from the door by preventing the heat insulation performance of the door.

  Further, in Patent Document 3, the door of the roaster unit is configured by a double glass plate while holding a space, the periphery of the glass plate is covered with a door cover, and the space between the double glasses is formed by a vacuum drawing device. It is a heating cooker that is in a vacuum state and prevents the temperature of the front door from rising.

JP 2000-274694 A JP 2000-65363 A JP 2008-241219 A

  In the above prior art, in the case of providing the vacuum heat insulating layer in the door, the one shown in Patent Document 1 is provided with a hole communicating with the outside in a part of the glass and a valve through which air passes in one direction in the hole part. Then, a method is used in which the air in the sealed space is discharged to form a vacuum space inside.

  However, in this method, since it is necessary to make a hole in the glass, there is a problem that the glass is easily broken during the opening operation.

  In addition, when a hole is made in the glass, the strength of the glass around the hole is weakened, so that there is a problem that the door is easily broken when subjected to an impact from the outside.

  In addition, if thick glass is used to make the glass hard to break, the door becomes heavier, increasing the operating force required to open and close the door, which burdens the user and increases noise and vibration when opening and closing the door. There was a problem.

  Furthermore, when the vacuum heat insulating layer is composed of only glass, it is necessary to sandwich a spacer in order to maintain the gap between the glasses. By sandwiching the spacer, the number of parts increases and the cost increases. There was a problem that obstructed the view.

  In order to prevent the convection in the door from the one shown in Patent Document 2, it is necessary to provide a large number of heat insulating space layers, and the volume of the door may increase.

  In addition, if a large number of heat insulating space layers are provided, the number of parts that partition the heat insulating space layers increases, and the weight of the door increases, and the volume and weight of the door increase, which increases vibration and noise when the door is opened and closed. The operability sometimes deteriorated.

  Furthermore, since heat is transmitted by the walls that partition the heat insulation space layer, it has been difficult to greatly improve the heat insulation performance of the door.

  Patent Document 3 shows a roaster door incorporated in a cooking device that does not use microwaves. In such a door, a vacuum drawing pipe can be provided on the upper surface or the like. In order to prevent microwaves from leaking between the door and the main body, it is necessary to provide a choke structure made of a substantially comb-shaped metal conductor around the door. In addition, the vacuum pipe could not be provided on the side of the door.

The present invention is made in order to solve the above-mentioned problems. In claim 1, a main body of a heating cooker, a heating chamber for storing food, and a microwave for heating the food in the heating chamber are generated. In a heating cooker comprising a magnetron, a heater for heating food in the heating chamber, and a door that can be opened and closed on the front surface of the main body,
The door has an inner glass disposed on the heating chamber side, an inner glass is disposed on the front surface side of the inner glass with a certain gap from the inner glass, and a metal is disposed around the inner glass and the inner glass. The door base is covered with a metal door base to form a sealed space in the gap, and the door base includes a choke structure formed by a substantially comb-shaped conductor piece on the outer periphery of the inner glass and the middle glass, The door base located in the gap between the substantially comb-like conductor pieces is provided with a check valve that allows air to flow only from the inside to the outside of the sealed space, and the air in the gap is sucked through the check valve to obtain a vacuum. The closed space is formed.

  According to a second aspect of the present invention, the door base that covers the periphery of the inner glass and the middle glass to form a sealed space in the gap is in contact with the inner glass and the middle glass.

  According to a third aspect of the present invention, a punching plate is provided on the front side of the inner glass so that the heating chamber can be seen, and the punching plate is in contact with both the inner glass and the middle glass.

  According to a fourth aspect of the present invention, a suction device capable of sucking air from the sealed space through the check valve and a suction path are provided, and the suction path exists inside the choke structure.

  According to Claim 1 of this invention, since the heat insulation performance in a door becomes high with the vacuum sealed space provided in the door, the power consumption at the time of cooking can be reduced compared with the conventional heating cooker.

  Further, by increasing the heat insulation performance of the door, the surface temperature of the door can be lowered, the temperature of the operation panel and handle provided on the door is lowered, and a cooking device safe for the user can be provided.

  Moreover, since the sealed space is formed by the inner glass, the middle glass, and the door base constituting the door, a check valve can be provided by opening a hole through which air passes through the door base. It is no longer necessary to make holes in the glass, the impact resistance of the glass is increased, the glass is less likely to break during manufacture, and the safety during use is improved.

  Moreover, since the inner glass and the middle glass are supported by the door base, large strength is not required, and a sealed space can be formed with a thin glass compared to the thickness of the glass that forms the conventional vacuum heat insulating layer, Cost reduction and weight reduction can be achieved.

  Furthermore, since the check valve is provided on the door base located in the gap between the substantially comb-like conductor pieces of the choke structure, there is no obstacle to the check valve mounting portion, and the sealed space is evacuated. And the microwave leakage preventing function by the choke structure is not adversely affected.

  Further, since the door base is made of metal, it is easy to make a hole, and the door base is easy to manufacture as compared with a case in which a valve is provided by opening a hole in glass.

  Furthermore, in the structure in which a vacuum is not provided between the inner glass and the inner glass without providing a valve, since it is necessary to manufacture in a vacuum state, a large-scale manufacturing facility is necessary, and the cost is high. A door with high thermal insulation performance can be manufactured.

  According to claim 2, the door base is in contact with the periphery of the inner glass and the middle glass to support the inner glass and the middle glass, so that a large strength is not required, and the thickness of the glass that forms the conventional vacuum heat insulating layer. Compared to this, a sealed space can be formed with a thin glass, and cost and weight can be reduced.

  Moreover, since a spacer is not required between the inner glass and the inner glass, the energy saving performance can be improved without deteriorating the visibility of viewing the inside of the heating chamber through the door.

  According to the third aspect, since the punching plate provided on the front side of the inner glass is in contact with both the inner glass and the inner glass, the compressive force of the inner glass and the inner glass is dispersed on the punching plate and the glass is hardly broken. Thus, even if it is made thinner, it can be made lighter than a conventional door while maintaining heat insulation performance.

  Further, the weight reduction of the door can suppress vibration and noise that are likely to occur due to the inertia of the door when the door is opened and closed, and can reduce the force required to open and close the door, thereby improving the operability in opening and closing the door.

  According to the fourth aspect of the present invention, since the suction path connecting the check valve and the suction device is disposed inside the choke structure in the door, the check valve is provided on the operation panel or the like to operate the suction device. Therefore, the air in the sealed space can be easily sucked, and the degree of vacuum in the sealed space can be increased.

  In addition, even if the vacuum degree in the sealed space is reduced by repeating the heating cycle for a long time, the vacuum degree in the sealed space can be maintained by driving the suction device.

It is side surface sectional drawing of the cooking-by-heating machine by the 1st Example of this invention. It is an expanded side sectional view of the door part of the cooking-by-heating machine by the 1st example of the present invention. It is a perspective sectional view of the cooking-by-heating machine by the 1st example of the present invention. It is a perspective view of the cooking-by-heating machine by the 1st example of the present invention. It is a section perspective view of the door of the cooking-by-heating machine by the 1st example of the present invention. It is an expanded side sectional view of the door part of the cooking-by-heating machine by the 2nd example of the present invention. It is a perspective view of the punching board of the heating cooker by the 2nd example of the present invention. It is a perspective sectional view of a heating cooker according to a third embodiment of the present invention.

  Hereinafter, the cooking device of the present invention will be described by taking as an example a household microwave oven provided with a hot air heater and a magnetron as heating means.

  The present invention can also be applied to other cooking devices for home use, such as a cooker for business use such as a steam convection oven, as long as a magnetron for microwave irradiation and a heater for heating are provided.

  A cooking device according to a first embodiment of the present invention will be described with reference to FIGS.

  The main body 1 of the heating cooker has a structure in which a heating chamber 3 and a machine room 4 arranged at the lower part of the heating chamber 3 are covered with a cabinet 11, and food is stored in the heating chamber 3 so that cooking is performed. It can be performed.

  A door 2 is provided in front of the heating chamber 3, and food is taken in and out of the heating chamber 3 by opening and closing the door 2.

  A control means 40 and a magnetron 41 are installed in the machine room 4. A hot air heater 42, a hot air fan 43 and a hot air motor 44 are installed on the rear surface of the heating chamber 3. An upper heater 45 and the like are installed on the upper surface of the heating chamber 3. Is installed, and the food disposed in the heating chamber 3 can be cooked by heating using the magnetron 41, the hot air heater 42, and the upper heater 45 which are heating means.

  The door 2 is attached to the main body 1 so as to be pivotable up and down so as to be opened upward, and its detailed structure is as shown below.

  An inner glass 24 is disposed inside the door 2, that is, on the front opening side of the heating chamber 3, and the front side of the inner glass 24 is covered with a punching plate 203 for preventing radio wave leakage so that the inside of the heating chamber 3 can be seen. The middle glass 23 is disposed on the front side of the bunching plate 203 while maintaining a certain gap from the inner glass 24.

  A metal door base 20 is in contact with the inner glass 24 and the middle glass 23 to cover the gap, and a sealed space 25 is formed by the gap.

  An outer glass 26 is disposed on the front side of the middle glass 23 while holding a certain space 30, and the periphery of the outer glass 26 and the door base 20 is held by a metal door frame 21. A circuit board 28 is arranged at the lower part of the section 30, a handle 22 is attached to the upper part of the front face of the door frame 21, and an operation panel 27 is arranged at the lower part of the front face. The outer glass 26 can also be used as the middle glass 23.

  As described above, the door base 20 is in contact with the periphery of the inner glass 24 and the middle glass 23 to cover the gap between the two, and forms a sealed space 25 by the gap, as well as the front opening of the door 2 and the main body 1. In order to prevent leakage of microwaves from between the inner glass 24 and the inner glass 23, a choke structure 201 formed by a substantially comb-shaped conductor piece 2010 is provided outside the periphery of the inner glass 24 and the inner glass 23. A smooth portion 202 is provided on a surface that contacts the peripheral edge of the front opening of the first front surface.

  Here, the sealed space 25 formed in the gap between the inner glass 24 and the inner glass 23 will be described. As shown in FIG. 5, the door base 20 forming the sealed space 25 is communicated with the inside of the sealed space 25. A check valve 205 is provided.

  The check valve 205 is a valve through which air flows only from the inside to the outside of the sealed space 25, and is provided on the door base 20 positioned in the gap 2011 between the substantially comb-like conductor pieces 2010 of the choke structure 201. . By disposing the check valve 205 in the gap 2011 between the conductor pieces 2010, the choke structure 201 does not adversely affect the microwave leakage prevention function.

  The check valve 205 may be located anywhere around the door base 20 except for the four corners. However, in order to minimize the adverse effect of the choke structure 201 on the microwave leakage prevention function, each side far from the four corners may be located. The vicinity of the center is desirable.

  The sealed space 25 is held in a vacuum by sucking the internal air. In order to make a vacuum state, the air in the sealed space 25 is sucked out and discharged from the check valve 205 using a suction pump (not shown). After the sealed space 25 is evacuated, air does not flow into the sealed space 25 by the check valve 205.

  When the inside of the sealed space 25 is evacuated, since the door base 20 acts as a spacer, no separate spacer is required and the sealed space 25 can be formed.

  Here, when the structure of the above-described embodiment is not carried out and the space between the inner glass 24 and the middle glass 23 is set to a vacuum state without providing a check valve, a work space for forming a vacuum state is provided. This necessitates a large-scale manufacturing facility, which is very expensive.

  Further, when the vacuum sealed space 25 is formed only by the inner glass 24 and the middle glass 23 as in a conventional cooking device, a hole for sucking air into either the inner glass 24 or the middle glass 23. This makes the glass around the hole weak and weakens the glass when the door 2 receives an external impact.

  In addition, when thick glass is used to make the glass that opens the hole difficult to break, the door 2 becomes heavier, increasing the operating force required to open and close the door, and burdening the user. There is a problem that noise and vibration increase.

  On the other hand, in the above-described embodiment, since the sealed space 25 is formed by the middle glass 23, the inner glass 24, and the door base 20, a hole through which air passes is formed in the door base 20 to check the valve 205. Can be provided.

  Therefore, the impact resistance of the middle glass 23 and the inner glass 24 is increased, and the middle glass 23 and the inner glass 24 are less likely to be broken during production, thereby improving the productivity. Further, the glass is not broken during use, and safety is improved.

  Further, since the inner glass 24 and the inner glass 23 are covered with the metal door base 20, the inner glass 24 and the inner glass 23 do not need a large strength and are thinner than the thickness of the glass forming the conventional vacuum heat insulating layer. Even in about 3 mm, the sealed space 25 can be formed, and cost reduction and weight reduction can be achieved.

  Further, in this embodiment, the inside of the sealed space 25 can be evacuated by sucking air to the outside from the check valve 205 on the door base 20 by a suction pump, so that a door with excellent heat insulation can be easily formed. Can be manufactured.

  Furthermore, since the check valve 205 is provided in the door base 20 located in the gap 2011 between the substantially comb-like conductor pieces 2010 of the choke structure, there is no obstruction in the mounting portion of the check valve 205. The sealed space 25 can be easily evacuated, and the microwave leakage prevention function by the choke structure 201 is not adversely affected.

  Further, the smoothing portion 202 provided on the door base 20 is in contact with the periphery of the front opening of the main body 1 on substantially the same plane, and the choke structure 201, the smoothing portion 202, and the punching plate 203 are electrically connected. Therefore, it is possible to prevent microwave leakage between the door 2 and the main body 1 and microwave leakage from the punching plate 203.

  Of course, since the heat insulation performance in the door 2 is enhanced by the vacuum sealed space 25 of the door 2, it is possible to reduce the amount of power consumed during cooking by heating as compared to the conventional cooking device.

  Moreover, by improving the heat insulation performance of the door 2, the surface temperature of the door 2 can be lowered, the temperature of the operation panel 27, the handle 22, etc. can be lowered, and a cooking device safe for the user can be provided.

  A cooking device according to a second embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 6, the structure of this embodiment is such that a punching plate 203 provided so that the inside of the heating chamber 3 can be seen on the front side of the inner glass 24 is bent back and forth in a substantially wave shape, and the protruding portion 2031 is formed. In this structure, both the middle glass 23 and the inner glass 24 are brought into contact with each other.

  Since the punching plate 203 is curved in a substantially wave shape, the sealed space 25 of the middle glass 23 and the inner glass 24 can be enlarged, and thereby the heat insulating performance of the door 2 can be further enhanced.

  Further, since the middle glass 23 and the inner glass 24 are supported by the substantially wave-shaped projections 2031 of the punching plate 203, the compressive force in the sealed space 25 is dispersed in the punching plate 203, and the glass thickness is reduced as compared with the conventional case. Even if it is thin, it becomes difficult to break.

  For example, in the conventional vacuum glass, the thickness is about 10 to 20 mm and the weight is heavy. However, the glass of this embodiment may be about 2 to 3 mm, and a part of the sealed space 25 is used as the door base 20. By using it, it is possible to reduce the weight of the conventional door while maintaining the same heat insulating performance as that of incorporating a conventional vacuum glass.

  Therefore, vibration and noise that are likely to occur due to the inertia of the door 2 when the door 2 is opened and closed can be suppressed. Moreover, since the force required for opening and closing the door 2 can be reduced by reducing the weight of the door 2, the operability in opening and closing the door is improved.

  Here, the protrusion 2031 provided on the punching plate 203 may have the structure shown in FIGS. 7A, 7B, and 7C.

  FIG. 7A shows a structure in which a flat protrusion 2031 is provided on the punching plate 203 so as to form a substantially basin shape. The periphery of the punching plate 203 is brought into contact with the inner glass 24, and the flat protrusion 2031 is fixed to the middle glass 23. It is a thing made to contact.

  According to this structure, the sealed space 25 can be formed while maintaining the visibility of the door 2 in addition to the functions and effects of FIG.

  FIG. 7B shows a structure in which a plurality of protrusions 2031 are provided on the punching plate 203, the periphery of the punching plate 203 is brought into contact with the inner glass 24, and the plurality of protrusions 2031 are attached to the middle glass 23. It is to be contacted.

  According to this structure, the punching plate 203 can be easily manufactured in addition to the operations and effects of FIG.

  If there are three or more protrusions 2032, the inner glass 24 and the outer glass 26 can be supported on a plane, but four or more are desirable.

  Further, FIG. 7C shows a structure in which protrusions 2031 are provided above and below the punching plate 203 (or left and right). 23.

  Also in this structure, the punching plate 203 can be easily manufactured in addition to the operations and effects of FIG.

  The punching plate 203 may have the protrusion 2031 in contact with the inner glass 24 and the periphery of the punching plate 203 in contact with the middle glass 23.

  As described above, by providing the punching plate 203 with the protruding portion 2031, the sealed space 25 between the middle glass 23 and the inner glass 24 can be increased, and thereby the heat insulating performance of the door 2 can be further enhanced.

  Further, since the punching plate 203 is in contact with both the inner glass 23 and the inner glass 24, the compressive force in the sealed space 25 is dispersed in the punching plate 203, and the cooking is less likely to break even if the glass is thinner than the conventional one. Can be provided.

  A cooking device according to a third embodiment of the present invention will be described with reference to FIG.

  In this embodiment, a suction device 46 is provided inside the machine chamber 4, and a suction path 47 that connects the suction device 46 and the check valve 205 is disposed inside the choke structure 201 in the door 2.

  In the present embodiment, a structure such as providing a suction button (not shown) for operating the suction device 46 is added to the operation panel 27 and the check valve 205 is operated via the suction path 47 by operating the suction button. The air in the sealed space 25 can be sucked.

  Further, by driving the suction device 46 with the opening and closing of the door 2, it is possible to suck the air in the sealed space 25 every time the door 2 is opened and closed.

  Furthermore, the vacuum degree of the door 2 can be increased by instructing cooking by the operation panel 27 and simultaneously driving the suction device 46.

  Therefore, the vacuum degree in the sealed space 25 can be increased by driving the suction device 46 of the cooking device.

  Therefore, even if the degree of vacuum in the sealed space 25 is reduced by repeating a long heating cycle, the degree of vacuum in the sealed space 25 can be maintained by driving the suction device 46.

  In the case of the above structure, it is desirable that the suction path 47 disposed inside the choke structure 201 is short in order not to deteriorate the microwave leakage prevention function by the choke structure 201. Therefore, the position of the check valve 205 is preferably near the hinge on the lower side of the door, and the suction path 47 is also preferably made of a material having a low dielectric constant such as a fluororesin.

DESCRIPTION OF SYMBOLS 1 Main body 2 Door 3 Heating chamber 4 Machine room 20 Door base 21 Door frame 23 Middle glass 24 Inner glass 25 Sealed space 26 Outer glass 41 Magnetron 45 Upper heater 46 Suction device 47 Suction path 201 Choke structure 202 Smooth part 203 Punching plate 2011 Gap 2031 Protrusion

Claims (4)

A main body of the heating cooker, a heating chamber for storing food, a magnetron for generating microwaves for heating the food in the heating chamber, a heater for heating the food in the heating chamber, and a front opening of the main body. In a heating cooker with a provided door,
The door has an inner glass disposed on the heating chamber side, an inner glass is disposed on the front surface side of the inner glass with a certain gap from the inner glass, and a metal is disposed around the inner glass and the inner glass. Covered with a made door base to form a sealed space in the gap,
The door base includes a choke structure formed by a substantially comb-like conductor piece on the outside of the periphery of the inner glass and the middle glass,
Provided with a check valve in which air flows only from the inside of the sealed space to the outside on the door base located in the gap between the substantially comb-like conductor pieces,
A cooking device, wherein air in the gap is sucked through the check valve to form a vacuum sealed space.   2. The cooking according to claim 1, wherein a door base that covers a periphery of the inner glass and the middle glass and forms a sealed space in the gap is in contact with the inner glass and the middle glass. vessel.   The cooking device according to claim 1 or 2, wherein a punching plate is provided so that the heating chamber can be seen on the front side of the inner glass, and the punching plate contacts both the inner glass and the middle glass. .   4. The suction device according to claim 1, further comprising: a suction device capable of sucking air from the sealed space through the check valve and a suction path, wherein the suction path exists inside the choke structure. Cooking cooker.

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