JP2011149643A - Heat cooking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat cooking apparatus that improves hydrophilic properties in a steam generator and evaporation efficiency by the steam generator. <P>SOLUTION: The steam generator 13 has a container body 130 into which water is dropped from a water feeding device. An internal surface of the container 130 includes an evaporation front 131 that evaporates dropped water. The evaporation front 131 has protrusions and dents. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cooking device.

  2. Description of the Related Art Conventionally, a heating cooker includes a casing having a heating chamber that accommodates an object to be cooked and a steam generator that generates steam to be supplied to the heating chamber (Japanese Patent Laid-Open No. 2006-38315: Patent Document 1). This steam generator has a container body that evaporates water supplied to the inside thereof. The inner surface of the container body is formed smoothly.

  However, in the conventional cooking device, the inner surface of the container body of the steam generator is formed smoothly, so that the water dropped on the inner surface of the container body becomes spherical due to surface tension, The contact area with the inner surface was small. For this reason, there was a problem that the evaporation efficiency by the steam generator was lowered.

  Furthermore, a coating having water repellency may be provided on the inner surface of the container body by coating or the like in order to prevent oxide precipitation such as rust. In this case, the evaporation efficiency by the steam generator is further reduced. was there.

JP 2006-38315 A

  Then, the subject of this invention is providing the heating cooker which improves the hydrophilic property of the inner surface of a steam generator, and improves the evaporation efficiency by a steam generator.

In order to solve the above problems, the heating cooker of the present invention is:
A casing,
A heating chamber that is provided in the casing and accommodates an object to be cooked,
A steam generator for generating steam to be supplied into the heating chamber;
A water supply device for supplying water to the steam generator,
The steam generator is
A container body into which water is dropped from the water supply device;
A heater for generating steam that heats the container body and evaporates water dropped on the container body;
The inner surface of the container body includes an evaporation surface for evaporating the dropped water, and the evaporation surface has an uneven shape.

  According to the cooking device of the present invention, the steam generator has a container body into which water is dropped from the water supply device, and an inner surface of the container body is an evaporation surface for evaporating the dropped water. Since the evaporation surface has an uneven shape, the spherical water dropped on the evaporation surface is expanded and formed into a film shape by the uneven shape of the evaporation surface. For this reason, the contact angle between the evaporation surface and the water droplet is reduced, the hydrophilicity of the evaporation surface is improved, and the evaporation efficiency by the steam generator is improved.

  Moreover, in the heating cooker of one Embodiment, the film which has water repellency is included in the said evaporation surface of the said container main body.

  According to the heating cooker of this embodiment, since the evaporation surface of the container body includes a water-repellent coating, the coating can prevent precipitation of oxides such as rust. Even if the evaporation surface has a water-repellent coating, the unevenness of the evaporation surface can improve the hydrophilicity of the evaporation surface and improve the evaporation efficiency.

  Moreover, in the heating cooker of one Embodiment, the said container main body is comprised by die-casting, and the said heater for steam generation is cast in the said container main body.

  According to the cooking device of this embodiment, the container main body is configured by die casting, and the steam generating heater is cast into the container main body, so that the contact area between the steam generating heater and the container main body is The evaporation efficiency can be further improved.

Moreover, in the heating cooker of one embodiment,
When the surface roughness of the concavo-convex shape of the evaporation surface is Ra, the arithmetic average roughness is Ra, the ten-point average roughness is Rz, the average interval between the irregularities is Sm, and the average interval between the local peaks is S,
At least one of Sm / Ra <155, S / Ra <35, Sm / Rz <25, and S / Rz <5.0 is satisfied.

  According to the heat cooking of this embodiment, since at least one of Sm / Ra <155, S / Ra <35, Sm / Rz <25, and S / Rz <5.0 is satisfied, the hydrophilicity of the evaporation surface Evaporating efficiency can be increased.

  Moreover, in the heating cooker of one Embodiment, the said evaporation surface has a some groove | channel arranged in the grid | lattice form.

  According to the cooking device of this embodiment, since the evaporation surface has a plurality of grooves arranged in a lattice pattern, the uneven surface can be easily formed by the plurality of grooves.

  Moreover, in the heating cooker of one Embodiment, the said evaporation surface has several recessed curved parts arranged in zigzag form.

  According to the cooking device of this embodiment, since the evaporation surface has a plurality of concave curved portions arranged in a staggered manner, the concave and convex surfaces can be easily formed by the plurality of concave curved portions.

  According to the cooking device of the present invention, the steam generator has a container body into which water is dropped from the water supply device, and has an evaporation surface for evaporating the dropped water. Since it has an uneven shape, it improves the hydrophilicity of the evaporation surface of the container body of the steam generator and improves the evaporation efficiency by the steam generator.

It is a front view which shows one Embodiment of the heating cooker of this invention. It is the perspective view which looked at the cooking-by-heating machine by which the top part and both sides of the casing were removed from diagonally upward ahead. It is a perspective view of the heating cooker in the state where the door part opened. It is the perspective view which looked at the cooking-by-heating machine from back diagonally upward. It is AA sectional drawing of FIG. 2A. It is a simplified block diagram of a steam generator. It is an enlarged view which shows the uneven | corrugated shape of an evaporation surface. It is an enlarged view which shows the other uneven | corrugated shape of an evaporation surface. It is a table | surface which shows the relationship between a surface roughness parameter and evaporation efficiency.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1: has shown the front view which is one Embodiment of the heating cooker of this invention. As shown in FIG. 1, the cooking device includes a casing 1 and a door portion 2 with a slide opening / closing handle attached to the front side of the casing 1.

  An operation panel 3 is provided on the front side of the casing 1 so as to be adjacent to the door 2 when closed. Below the door portion 2 and the operation panel 3, a dew receiving device 4 as an example of an exhaust receiving portion is arranged.

  A substantially cylindrical dial 5 is rotatably attached to the operation panel 3. Further, the operation panel 3 has a liquid crystal display unit 7, and the liquid crystal display unit 7 performs display according to the operation of the dial 5.

  The dew receptacle 4 is a container that can be attached to and detached from two front legs 6 and 6 provided on the front side of the bottom of the casing 1. Then, when the dew receptacle 4 is inserted into the lower side of the casing 1 from the front to the rear and attached to the front legs 6, 6, a part of the dew receptacle 4 is on the rear surface (back surface) of the door portion 2 when closed. Located below. Thereby, when the door part 2 is open | released, the dew condensation water adhering to the rear surface of the door part 2 is dripped in the dew receptacle 4.

  FIG. 2A shows a perspective view of the heating cooker from which the top and both sides of the casing 1 have been removed, as seen from the front obliquely upward, and FIG. 2B is a perspective view of the heating cooker with the door opened. Is shown. Moreover, FIG. 3 has shown the perspective view which looked at the heating cooker of FIG. 2A from back diagonally upward.

  As shown in FIGS. 2A, 2 </ b> B, and 3, a heating chamber 8 that houses and heats an object to be cooked is installed in the casing 1. In the casing 1, an electrical component chamber 9 is provided on the side of the heating chamber 8 and behind the operation panel 3, and an intake space 10 is provided behind the heating chamber 8 and behind the electrical component chamber 9. The electrical component chamber 9 and the intake space 10 are partitioned by a partition wall 21. A cooling fan 16 is attached to the partition wall 21.

  The heating chamber 8 has an opening 8a that opens forward, and the door 2 slides forward and backward by a pair of rail units 31 to open and close the opening 8a. The rail unit 31 includes a movable rail having one end fixed to the door portion 2 and a fixed rail that is fixed to the casing 1 and supports the movable rail in a slidable manner.

  Further, the tray 32 is pulled out together with the door portion 2. By opening and closing the door portion 2, the food to be cooked placed on the tray 32 is taken out from the heating chamber 8 or put into the heating chamber 8.

  In addition, heat shield plates 11 are arranged above, below, behind and on both sides of the heating chamber 8. That is, the heat shield plate 11 is arranged around the opening 8 a of the heating chamber 8. Further, a space between the heat shield plate 11 and the heating chamber 8 is filled with a heat insulating material (not shown).

  In the electrical component chamber 9, a steam generator 13 for generating steam to be supplied to the heating chamber 8, a water supply pump 14 connected to the steam generator 13 via a water supply tube 20, and the water supply pump 14 The tank storage part 15 arrange | positioned ahead is accommodated.

  A water supply tank 23 containing a necessary amount of water is stored in the tank storage unit 15, and the water supply tank 23 is connected to the water supply pump 14 via a water supply tube 20. The water supply pump 14 and the water supply tank 23 constitute a water supply device that supplies water to the steam generator 13.

  The steam generator 13 has a steam generating heater 24 (see FIG. 4), and heats the water supplied from the water supply pump 14 to generate steam.

  As the cooling fan 16 is driven, air outside the casing 1 flows into the intake space 10 from the four intake ports 17. Air in the intake space 10 is sent into the electrical component chamber 9 by the cooling fan 16. When the cooking object is heated, cooling air from the cooling fan 16 flows through the electrical component chamber 9 so that electrical components such as the water supply pump 14 can be cooled. Each intake port 17 includes a plurality of slits provided at the rear portion of the casing 1.

  The upstream end of the exhaust tube 18 is connected to an exhaust port provided at the rear portion of the heating chamber 8 via a catalyst unit (not shown) installed above the rear portion of the heating chamber 8. The downstream end (exhaust port) of the exhaust tube 18 is connected to a synthetic resin exhaust duct 19 disposed on the side of the tank housing 15. The exhaust tube 18 is made of a synthetic resin having flexibility, and is installed from the upper rear side to the lower front side of the electrical component chamber 9.

  And the gas in the said heating chamber 8 is guided to the front side from the rear part of the casing 1 by the exhaust tube 18 and the exhaust duct 19, and is discharged to the outside of the casing 1.

  4 is a cross-sectional view taken along the line AA in FIG. 2A. In FIG. 4, illustration of some members and devices in the casing 1 is omitted.

  An upper heater storage portion 25 and a lower heater storage portion 28 are provided so as to be adjacent to the heating chamber 8.

  The upper heater storage 25 is disposed above the heating chamber 8. The upper heater storage unit 25 heats the inside of the heating chamber 8 from above and generates superheated steam. The upper heater housing 25 is connected to a steam outlet provided at the upper part of the steam generator 13 via a horizontal pipe 114.

  In the upper heater accommodating portion 25, an upper heater 26 made of, for example, a sheathed heater is accommodated. The saturated water vapor generated by the steam generator 13 is blown into the upper heater housing 25 and is heated by the upper heater 26 to become superheated water vapor.

  A plurality of steam outlets 111 are provided in the bottom plate 110 of the upper heater storage section 25, and superheated steam is jetted downward into the heating chamber 8 from the plurality of steam outlets 111, and the tray. The cooking object on 32 is heated. The bottom plate 110 defines the top surface of the heating chamber 8.

  The food to be cooked is also heated by the radiant heat of the upper heating heater 26. Here, the said superheated steam means the steam heated to the overheated state of 100 degreeC or more. On the other hand, when the saturated steam from the steam generator 13 is not heated by the upper heater 26, the saturated steam heats the food.

  The bottom plate 110 functions as a partition that separates the space in the upper heater housing 25 and the space in the heating chamber 8 and is heated by the upper heating heater 26 to irradiate the food in the heating chamber 8 with radiant heat. It also functions as a radiation plate.

  On the other hand, the lower heater housing portion 28 is disposed below the heating chamber 8. The lower heater storage unit 28 heats the inside of the heating chamber 8 from the lower side. In the lower heater accommodating portion 28, a lower heating heater 27 such as a sheathed heater is accommodated.

  The lower heating heater 27 is completely covered with the top plate 120 of the lower heater housing portion 28 and is not exposed to the space in the heating chamber 8. The top plate 120 defines the bottom surface of the heating chamber 8. Thereby, even if the oil etc. which came out of the said to-be-cooked object dripped, the oil etc. do not adhere to the heater 27 for lower heating, and it can prevent the smoke generation and the ignition resulting from the adhesion. Further, the lower heating heater 27 can be prevented from being contaminated with the oil or the like.

  The top plate 120 functions as a partition wall that separates the space in the lower heater storage portion 28 and the space in the heating chamber 8, and is heated by the lower heating heater 27 to radiate heat to the food in the heating chamber 8. It also functions as a radiation plate for irradiation.

  The rail units 31 and 31 are connected to each other by a plate-like member 34. In a state where the tray 32 is placed in the heating chamber 8, that is, in a state where the opening 8 a of the heating chamber 8 is closed, the plate-like member 34 faces the lower heater storage portion 28.

  As shown in FIG. 5, the steam generator 13 includes a container body 130 and a steam generating heater 24. Water is dripped into the container main body 130 from the water supply pump 14 (water supply device). The steam generating heater 24 heats the container main body 130 to evaporate the water dropped on the container main body 130.

  The container main body 130 has a base material made of metal die casting such as aluminum and a film covering the surface of the base material. This film has water repellency and prevents the precipitation of oxides such as rust from the surface of the substrate. This coating is formed, for example, by painting or the like.

  The steam generating heater 24 is cast into the container body 130. Therefore, the contact area between the steam generating heater 24 and the container main body 130 can be increased, the heat of the steam generating heater 24 can be efficiently transmitted to the container main body 130, and the evaporation efficiency is improved.

  The inner surface of the container body 130 includes an evaporation surface 131 that evaporates the dropped water. The evaporation surface 131 is a surface surrounding the steam generating heater 24 in the inner surface of the container main body 130.

  The evaporation surface 131 has an uneven shape. As the method for forming the uneven shape, the surface of the base material may be processed to be uneven, and then the uneven shape may be formed by providing the base material with the coating film, or minute unevenness may be formed on the base material. An uneven shape may be formed by providing a film having a property, or an uneven shape may be formed by applying an unevenness treatment to the film after providing the film on the substrate.

  As this uneven | corrugated shape, as shown to FIG. 6A, it is comprised from the several groove | channel 132 arranged in the grid | lattice form, and an uneven surface can be formed easily. In the figure, the grooves 132 are shown in black. The groove 132 is formed in a coating provided on the base material. For example, the groove width is 1 mm, the groove depth is 1 mm, and the groove pitch is a pitch (for example, 2 mm) that is equal to or less than the diameter of the water droplet (for example, 2 mm) that is dropped on the evaporation surface 131. The surface tension of the evaporation surface 131 can be broken to increase the hydrophilicity of the evaporation surface 131.

  Or as shown to FIG. 6B, it is comprised from the some concave curved part 133 arranged in zigzag form, and an uneven surface can be formed easily. In the figure, the concave curved portion 133 is shown in black. Here, the concave curved portion 133 refers to a concave portion having a concave curved surface, for example, a concave portion having a part of a spherical surface such as a hemisphere. The concave curved portion 133 is formed on a coating provided on the base material. For example, the groove diameter is a diameter (for example, 2 mm) equivalent to the diameter of the water droplet (for example, 2 mm) dropped on the evaporation surface 131, and the surface tension of the water dropped on the evaporation surface 131 is broken to make the evaporation surface 131 hydrophilic. Can increase the sex.

  In addition, the said groove | channel 132, the said concave-curved part 133, and another groove | channel are formed by a metal mold | die, sandblasting, etc. Moreover, as a film (for example, coating material) having minute unevenness, there are those containing fine particles in the main agent.

  Regarding the surface roughness of the uneven shape of the evaporation surface 131, when the arithmetic average roughness is Ra, the ten-point average roughness is Rz, the average interval between the unevenness is Sm, and the average interval between the local peaks is S, At least one of Sm / Ra <155, S / Ra <35, Sm / Rz <25, and S / Rz <5.0 is satisfied. Therefore, the hydrophilicity of the evaporation surface 131 can be increased and the evaporation efficiency can be increased.

  FIG. 7 shows the relationship between the surface roughness parameters (Ra, Rz, Sm, S, Sm / Ra, S / Ra, Sm / Rz, S / Rz) and the evaporation efficiency.

  As shown in FIG. 7, in the comparative example, Sm / Ra> 155, S / Ra> 35, Sm / Rz> 25, S / Rz> 5.0, and there is a problem that the evaporation efficiency is low. On the other hand, in Example I and Example II, Sm / Ra <155, S / Ra <35, Sm / Rz <25, and S / Rz <5.0, and there is no problem because the evaporation efficiency is good.

  Explaining this reason, the larger Ra or Rz, the deeper the irregularities and the better the hydrophilicity, and the smaller Sm or S, the more irregularities and the hydrophilicity. However, even if Ra or Rz is large, if Sm or S is large, the evaporation efficiency decreases. Similarly, even if Sm or S is small, if Ra or Rz is small, the evaporation efficiency decreases. Therefore, the smaller the Sm / Ra, S / Ra, Sm / Rz, and S / Rz, the better the evaporation efficiency.

  Next, the operation of the cooking device configured as described above will be described. As shown in FIG. 2B, after the water supply tank 23 containing the required amount of water is stored in the tank storage unit 15 with the door 2 being pulled out, the operation panel 3 is operated to perform cooking using steam. To start.

  Then, the upper heating heater 26 and the lower heating heater 27 arranged above and below the heating chamber 8 are turned on, and the water supply pump 14 is driven to supply water in the water supply tank 23 to the steam generator 13. The water supplied to the steam generator 13 is heated by the steam generating heater 24 to generate water vapor.

  And the water vapor | steam generate | occur | produced in the steam generator 13 blows in the upper heater accommodating part 25 of the upper side of the heating chamber 8, and is heated by the upper heating heater 26, and turns into 100 degreeC or more superheated steam. The superheated steam is supplied into the heating chamber 8 through the steam outlet 111 of the bottom plate 110 of the upper heater housing portion 25.

  Thereby, the food placed on the tray 32 in the heating chamber 8 was blown out from the radiant heat from the bottom plate 110 of the upper heater storage unit 25, the radiant heat from the top plate 120, and the steam outlet 111 of the bottom plate 110. It is cooked with superheated steam at 100 ° C. or higher. At this time, the superheated steam supplied and adhered to the food surface condenses on the food surface and gives a large amount of latent heat of condensation to the food, so that heat can be efficiently transmitted to the food.

  In this cooking device, healthy cooking can be performed by using superheated steam or saturated steam in a microwave oven or the like. For example, in the cooking device of the present invention, superheated steam or saturated steam having a temperature of 100 ° C. or higher is supplied to the food surface, and the superheated steam or saturated steam adhered to the food surface is condensed to give a large amount of condensation latent heat to the food. So it can efficiently transfer heat to food. Moreover, when condensed water adheres to the food surface and salt and oil are dropped together with condensed water, salt and oil in the food can be reduced. Further, the inside of the heating chamber is filled with superheated steam or saturated steam, and becomes anoxic state, thereby enabling cooking while suppressing oxidation of food.

  In this heating cooker, oven cooking using only the upper heating heater 26 and the lower heating heater 27 without using steam may be performed, or the upper heating heater 26 and the lower heating heater 27 are used. Alternatively, steamed dishes using only the steam generated by the steam generator 13 may be performed.

  According to the heating cooker having the above configuration, the steam generator 13 has the container body 130 into which water is dropped from the water supply device, and the inner surface of the container body 130 evaporates the dropped water. Since the evaporation surface 131 has an uneven shape, the spherical water dropped on the evaporation surface 131 is expanded by the uneven shape of the evaporation surface 131 into a film shape. For this reason, the contact angle between the evaporation surface 131 and the water droplet is reduced, the hydrophilicity of the evaporation surface 131 is improved, and the evaporation efficiency by the steam generator 13 is improved. In particular, even if the evaporation surface 131 has a water-repellent film, the unevenness of the evaporation surface 131 can improve the hydrophilicity of the evaporation surface 131 and improve the evaporation efficiency.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, a steam generating heater may be arranged so as to be wound around the outer surface of the container body. Further, the steam generated by the steam generator may be sent directly to the heating chamber. Further, the upper heater storage section and the lower heater storage section need not be provided. Further, the groove 132, the concave curved portion 133, and the like may be mixed on the evaporation surface.

1 Casing 2 Door 4 Dew Receptor (Exhaust Receiver)
8 Heating chamber 9 Electrical component room 10 Air intake space 13 Steam generator 14 Water supply pump (water supply device)
15 Tank storage part 16 Cooling fan 18 Exhaust tube (exhaust passage)
19 Exhaust duct 22 Discharge port 23 Water supply tank (water supply device)
24 Steam generation heater 25 Upper heater storage section 26 Upper heating heater 27 Lower heating heater 28 Lower heater storage section 110 Bottom plate 111 Steam outlet 114 Horizontal pipe 120 Top plate 130 Container body 131 Evaporating surface 132 Groove 133 Concave curved portion

Claims (6)

A casing,
A heating chamber that is provided in the casing and accommodates an object to be cooked,
A steam generator for generating steam to be supplied into the heating chamber;
A water supply device for supplying water to the steam generator,
The steam generator is
A container body into which water is dropped from the water supply device;
A heater for generating steam that heats the container body and evaporates water dropped on the container body;
An inner surface of the container body includes an evaporation surface for evaporating the dropped water, and the evaporation surface has an uneven shape. The heating cooker according to claim 1, wherein
A cooking device, wherein the evaporation surface of the container body includes a water-repellent coating. The heating cooker according to claim 1 or 2,
The said cooker main body is comprised by die-casting, The said steam generation heater is cast in the said container main body, The heating cooker characterized by the above-mentioned. The cooking device according to any one of claims 1 to 3,
When the surface roughness of the concavo-convex shape of the evaporation surface is Ra, the arithmetic average roughness is Ra, the ten-point average roughness is Rz, the average interval between the irregularities is Sm, and the average interval between the local peaks is S,
A heating cooker characterized by satisfying at least one of Sm / Ra <155, S / Ra <35, Sm / Rz <25, and S / Rz <5.0. In the heating cooker according to any one of claims 1 to 4,
The cooking device according to claim 1, wherein the evaporation surface has a plurality of grooves arranged in a lattice pattern. The cooking device according to any one of claims 1 to 5,
The evaporating surface has a plurality of concave curved portions arranged in a staggered pattern.

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