JP2000337634A - Heating cooking appliiance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a hot air generating unit employing a DC brushless motor. SOLUTION: A hot air generating unit 29 situated on one side of an oven chamber comprises a hot air casing 31 provided at an internal part with a heater 34 and a hot air fan 33 and mounted on the rear wall (a side wall) 23a of an oven chamber 23; and a DC brushless motor 38 situated outside the hot air casing 31 so as to rotationally drive the hot air fan 33 through a rotary shaft 40. The DC brushless motor 38 extends a base frame 42 made of resin, holding the motor 38, orthogonally to a shaft, and the extension end part and a fixing member 43 separately disposed externally of the hot air casing 31 are coupled together and securely mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker provided with a hot air generating unit for supplying hot air into an oven for heating and cooking an object to be cooked with hot air.

[0002]

2. Description of the Related Art Conventionally, a structure of a heating cooker of this type which can be heated and cooked by hot air is shown, for example, in FIG.
Referring to a vertical sectional side view of FIG. 1, an oven box 3 having an open front surface and an RT motor 4 located below the oven box 3 are provided in an outer box 2 of the heating cooker 1.
A metal disk-shaped rotating net 5 disposed at the lower portion of the oven storage 3 is rotatably provided by the T motor 4. And inside the oven storage 3, there is provided a metal-made, approximately square-shaped square plate 6 or 7 detachably provided in two upper and lower stages.
A door 8 for opening and closing the front opening of the oven storage 3 is provided at the front.

[0003] On the back side of the rear wall 3a of the oven storage 3, a hot air generating unit 9 for supplying hot air into the storage is provided. The hot air generating unit 9 includes an annular heater 10 composed of a sheathed heater, a hot air fan 11, a hot air casing 12, a cooling fan 13, and an AC shading motor 14 fixed to the hot air casing 12. The heater 10 that energizes and generates wind generated by the rotation of the hot air fan 11 by energizing driving
And the cooling fan 13 rotates to cool the shading motor 14 and the surroundings. Therefore, in order to supply the hot air generated by the hot air generation unit 9 into the oven storage 3, the rear wall 3 a of the oven storage 3 is provided with a suction port 15 including a plurality of through-hole groups on the center suction side of the hot air fan 11. On the discharge side corresponding to the heater 10, upper and lower outlets 1 comprising a plurality of through holes are provided.
6, 17 are formed.

[0004] The hot air casing 12 comprises a heater 1.
Heat shield plate 12 composed of two sheets as a heat shield measure against
a and 12b, and has a structure in which a space exists in the double structure to increase the heat shielding effect. This heat shielding measure is intended to provide thermal insulation to peripheral members due to part of the heat from the heater 10 being dissipated outside the hot air casing 12 and to prevent the heating efficiency of the heater 10 from being reduced. . A cover member 18 is provided on the outer side of the outer box 1 so as to cover the hot air generating unit 9 configured as described above.
, Which also serves as a protective cover for the unit 9 and forms the rear surface of the product which is the cooking device 1. And project to the rear.

[0005] In the heating cooker 1 having the above-described configuration, when heating the cooking objects (not shown) stored on the upper and lower square plates 6 and 7, the AC darkening motor 14 and the heater 10 are energized. As a result, hot air is generated as the hot air fan 11 rotates. That is, the hot air generation unit 9
Hot air is generated by this, and this hot air is blown to the upper and lower outlets 1
Supply from 6 and 17 into the oven storage 3. The hot air supplied from the upper outlet 16 flows through the upper space above the upper square plate 6 as shown by the solid line arrow A in the figure, reaches the inner surface of the front door 8 and circulates downward. Square plate 6,7
Hot air casing 1 from the inlet 15 through the central space between
2, the hot air is again heated to a high temperature by the heater 10 or the like, and so-called hot air circulation is performed. On the other hand, the lower outlet 17
The hot air supplied from below into the lower space of the lower square plate 7 reaches the inner surface of the door 8 as shown by the dashed arrow B, turns upward, again returns to the hot air casing 12 through the central space, and the hot air circulation is performed. Thus, the object to be cooked is heated and cooked in the hot air atmosphere by the hot air circulation. While the cooking is being performed, the cooling fan 13 is also driven to rotate to cool the AC darkening motor 14 and the outer surfaces of the hot air casing 12, thereby preventing the surroundings from being heated by the heat generated by the heater 10. I do.

[0006]

According to the above configuration, the hot-air generating unit 9 has a hot-air casing 12 and a hot-air casing 12 in an axial dimension from the hot-air fan 11 to an AC shading motor 14 located at the rear of the hot-air fan 11. It is unavoidable that the motor 14 becomes relatively large due to the presence of the cooling fan 13 and the like. In particular, in the case of the shading motor 14, there is a limit to a thin structure including coils and bearing members. The portion protrudes greatly rearward, and furthermore, since this kind of shading motor 14 has poor driving efficiency and heats up due to its own heat loss, as a heat shielding measure, the heat insulation distance with peripheral members is increased. As a result, this kind of hot air generating unit 9 has a background situation that is not suitable for downsizing, for example, it is necessary to secure the hot air generating unit 9.

Accordingly, from the above circumstances, the cover member 18 is
As shown in the drawing, the protrusion has a locally protruded shape, and the protrusion dimension S0 to the cover member 18 behind the oven storage 3 is increased. As a result, the depth dimension W0 of the product as the cooking device 1 is increased, and the installation area is increased. The size of the inside of the oven warehouse 3 deteriorates, and the shape of the protruding cover member 18 is not only not good in appearance but also the outer dimension of the product in the front-rear direction. There were problems such as a rise in material costs as much as possible.

As a countermeasure, for example, a DC brushless motor (not shown) capable of thinning itself may be used in place of the AC shading motor 14, but in general, the DC brushless motor has a self-heating amount. Since the supporting frame is small, the supporting frame is made of a resin having relatively low heat resistance so as to facilitate productivity and weight reduction. However, the base frame is located near the hot air generating unit 9 of the cooking device 1, and In the conventional configuration in which the motor is simply mounted on the hot air casing 12 which is in a high temperature state, since the heat insulation is insufficient and the reliability of the heat resistance in actual use is lacking, the hot air casing 12 having a high temperature via the base frame is used. It is impossible to stably attach and fix the hot air generating unit on the top, and it is difficult to reduce the size of the hot air generating unit having such a configuration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a heating cooker capable of obtaining a stable mounting and fixing of a DC brushless motor and miniaturizing a hot air generation unit.

[0010]

Means for Solving the Problems To achieve the above object, a heating cooker according to the present invention comprises, first, a hot air supplied from a hot air generating unit provided on one side of an oven chamber into the oven chamber. Wherein the hot-air generating unit includes a heater and a hot-air fan inside, and a hot-air casing attached to a side wall of the oven chamber, and the hot-air fan is rotationally driven via a rotating shaft. A DC brushless motor provided outside the hot air casing so as to extend the resin base frame holding the motor in a direction perpendicular to the axis,
The extended end and a fixing member which is disposed outside the hot-air casing so as to be spaced apart from each other are connected and fixed (the invention of claim 1).

According to this structure, the fixing member is disposed outside the hot air casing which is in a high temperature state and is separated from the hot air casing, and is connected to the base frame extending in the direction perpendicular to the axis, so that the DC brushless motor is mounted and fixed. Therefore, a sufficient temperature gradient for lowering the temperature can be secured between the motor, the base frame and the hot air casing. Therefore, thermal effects can be avoided, and the DC brushless motor can be applied to thinning under stable mounting and fixing.
It is possible to reduce the size in the axial direction, which is the height of the hot air generation unit, and to provide a heating cooker that suppresses heat dissipation and has high heating efficiency.

According to the first aspect of the present invention, the fixing member is disposed in a cooling air path formed by a cooling fan provided between the hot air casing and the DC brushless motor. invention).

According to such a configuration, even if the fixing member is located on the high temperature side of the oven storage side and the hot air casing side,
Since it is always cooled by the cooling fan, it is more effective for preventing the temperature of the fixing member from rising.

Further, according to the first or second aspect of the present invention, a heat-resistant resin member is interposed at a connecting portion between the base frame and the fixing member of the DC brushless motor. ).

According to such a structure, heat is easily concentrated on the connecting portion between the extended end portion of the base frame and the fixing member, and the temperature is easily raised. Although there is a concern that the heat-resistant resin member is interposed, the same effect as substantially raising the heat-resistant temperature of the base frame can be obtained, and heat concentration can be effectively dealt with.

Further, in order to achieve the above object, the cooking device of the present invention comprises, secondly, an object to be cooked by hot air supplied into the oven from a hot air generating unit provided on one side of the oven; Wherein the hot-air generating unit includes a hot-air casing having a heater and a hot-air fan therein and attached to a side wall of an oven cabinet, and the hot-air fan for rotating the hot-air fan via a rotating shaft. A DC brushless motor provided outside the casing; and a cooling fan attached to the rotating shaft and disposed between the hot-air casing and the DC brushless motor. Is fixed to the hot-air casing via a fixing member made of a material having a large thermal resistance. Serial, characterized in that disposed in the cooling air path by the cooling fan (invention of claim 4).

According to such a configuration, the fixing member is made of a material having a large thermal resistance and is always subjected to a cooling action. As a result, the DC brushless motor can be effectively used for thinning under stable mounting and fixing.

According to a fourth aspect of the present invention, the fixing member is formed of a ceramic material (the invention of the fifth aspect).

According to this configuration, the thermal conductivity of the fixing member can be reduced, so that the thermal influence on the resin base frame can be reliably suppressed.

Still further, in order to achieve the above object, the cooking device according to the present invention is configured such that the cooking device is heated by hot air supplied into the oven from a hot air generating unit provided on one side of the oven. Wherein the hot-air generating unit has a heater and a hot-air fan inside, and a hot-air casing attached to a side wall of an oven cabinet; and the hot-air fan for rotating and driving the hot-air fan via a rotating shaft. A DC brushless motor provided outside the hot air casing, a cover member for covering the hot air generation unit is provided, and a resin base frame for holding the DC brushless motor is mounted on the inner surface side of the cover member. It is characterized by being fixed (the invention of claim 6).

According to this configuration, the base frame can be separated from the high-temperature side of the hot-air casing with a space therebetween, and therefore, is extremely effective in reducing the thermal effect on the resin base frame. It is.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of a heating cooker according to the present invention will be described with reference to FIGS. First, FIG.
FIG. 1 shows a schematic vertical sectional side view of a metal oven cabinet 23 having a front opening inside an outer box 22 and a plurality of upper and lower metal oven cabinets 23 arranged in the oven cabinet 23, for example. Square plates 24 and 25 are detachably accommodated through a front opening, and a metal disk-shaped rotating net 26 is provided below the lower square plate 25 in the lower portion of the outer box 22. R
It is provided so as to be rotatable by a T motor 27. A door 28 is provided at the front opening of the oven cabinet 23 so as to be openable and closable, and a hot air generating unit 29 described later is provided on one rear side, and a cover member 30 covering the unit 29 is Attached to the rear.

FIG. 1 is an enlarged longitudinal sectional view showing a rear portion of the cooking device 21 having the hot air generating unit 29 shown in FIG. 2, and FIG.
The rear wall 23a, which is one of the side walls forming the oven storage 23, has a metal hot-air casing 31 fixed to the back side by screws or the like. For example, in order to enhance the heat shielding effect so that the heat of a heater 34 described later does not radiate to the outside, the heat shielding plate 31a, 31b forms a double structure with a space and the outer heat shielding plate 31a. A heat insulator 32 made of glass wool is attached to the surface to further enhance the heat shielding effect.

In such a hot air casing 31, a centrifugal hot air fan 33 rotatably disposed and an annular heater 34 composed of a season heater disposed on the discharge side of the outer periphery of the hot air fan 33 are provided. In addition to the hot air fan 3
The rear wall 23a corresponding to the suction side of No. 3 is provided with a plurality of through holes 35 formed in the vicinity of the heater 34 on the discharge side with the suction port 35 interposed therebetween. An upper outlet 36 and a lower outlet 37 are respectively formed.

Thus, the hot air fan 33 is connected to one end through the hot air casing 31 and the heat insulator 32, and a rotating shaft 40 directly connected to the outer rotor 39 of the DC brushless motor 38 is provided at the other end. This rotating shaft 40
, A metal cooling fan 41 is connected and fixed between the DC brushless motor 38 and the hot air casing 31.

The DC brushless motor 38
Is attached and fixed by connecting a fixing member 43 provided on the oven cabinet 23 side to a resin base frame 42 which is formed integrally with the stator side and forms an outer shell. That is, first, the configuration of the former base frame 42 includes three support members 4 radially extending from the central base 42a as shown in FIG.
2b and a skeleton structure composed of a square (or circular) cylindrical portion 42c formed at the extended end thereof. The radial size of the cylindrical portion 42c is such that the cooling fan 41 is surrounded. In the configuration. Also, the latter fixing member 43
Consists of, for example, four plate members obtained by bending a strip-shaped metal plate into an L-shape, and one end of which is
Is fixed to the rear wall 23a with screws 44 at a distance outside,
The other end is connected and fixed to the cylindrical portion 42c of the base frame 42 via a heat-resistant resin member 45 joined with, for example, an adhesive.

Therefore, the configuration of the hot air generating unit 29 provided on the rear side, which is one side of the oven storage 23, consists of the hot air fan 33 and the heater 3 provided in the hot air casing 31.
4 and a DC brushless motor 38 that rotationally drives the hot air fan 33 and the cooling fan 41. The DC brushless motor 38 is an oven that straddles the hot air casing 31 via a base frame 42 and a fixing member 43. Library 2
3 and fixed to the rear wall 23a.
1 is introduced from between the respective supporting portions 42c of the skeleton base frame 42 as shown by the solid line arrow C in FIG. 1, flows through the cylindrical portion 23c, and flows through the DC brushless motor 38 and the surroundings. After being cooled, it is discharged to the outside through each fixing member 43.

As shown in FIG. 1, a cover member 30 provided at the rear portion of the outer box 22 has a large number of through-hole groups in a surface area opposed to the DC brushless motor 38 for sucking outside air for cooling. A cooling air passage formed by the cooling fan 41 interposed between the suction and exhaust ports 30a and 30b. Is formed.

The operation of the heating cooker 21 of the present embodiment configured as described above will be described with respect to the case of heating cooking such as a cookie or a roll pan.
The items to be cooked (doughs) are stored and placed in the containers 4 and 25, and are stored in the oven storage 23 and are set up in two stages. And door 2
After closing 8, a setting operation such as menu selection is performed by an operation control unit (not shown) and a start operation is performed.

As a result, the heater 34 of the hot air generating unit 29 and the DC brushless motor 38 are energized, and the hot air generated by the rotational driving of the hot air fan 33 is supplied into the oven chamber 23, and the arrows A and A shown in FIG. It flows in the B direction to the whole area inside the warehouse. ◎ That is, the air in the oven chamber 23 is taken into the hot air casing 31 from the suction port 35 of the rear wall 23a by the rotation drive of the hot air fan 33, and is heated by the heater 34 in the casing 31 to become hot air, and the rear wall 23a Are supplied from the upper and lower outlets 36 and 37 into the oven storage 23. The hot air from the upper and lower outlets 36, 37 is supplied to the square plates 2 arranged in two stages.
4 and 25, the air flows into the inside space of the compartment, reaches the inner surface of the front door 28, passes through the central space, and then returns to the rear wall 23.
The hot air is sucked into the hot air casing 31 from the suction port 35a, heated by the heater 34, and is heated to be heated, and the hot air is circulated by repeating this process, so that the hot air is evenly distributed throughout the inside of the refrigerator. Then, the objects to be cooked contained in the square plates 24 and 25 are uniformly heated and cooked by the hot air supplied into the oven storage 23 as described above.

During heating cooking, the heater 3
The temperature rise around the hot air generation unit 29 due to the heat generation of 4 is inevitable. For example, in the present embodiment, the hot-air casing 31 has a double structure including the heat-insulating plates 31a and 31b having a space in order to enhance the heat-shielding effect on the heater 34, and further dissipates heat from the outer surface of the hot-air casing 31. In order to reduce this, a heat insulating material 32 made of glass wool is attached to this. Thus, heat dissipation from the heater 34 is prevented as much as possible, and a decrease in heating efficiency during heating cooking is suppressed. However, it is still inevitable that a part of the heat is dissipated to the surroundings through the hot air casing 31. Incidentally, a part of the heat leaks directly to the outside also through the rotating shaft 40 of the hot air fan 33 penetrating the casing 31, Although the self-heating of the brushless motor 38 is small, the base frame 4
The surroundings of the DC brushless motor 38, the base frame 42, and the like, which are located in the vicinity, such as being directly transmitted to the motor 2, are placed in an environment of increasing temperature.

However, since the cooling fan 41 is also driven to rotate at the same time, the intake port 30a of the cover member 30 is
The outside air taken from the DC brushless motor 38 and the base frame 4 in the cooling air path indicated by arrow C in FIG.
2, including the fixing member 43 and the heat-resistant resin member 45,
Further, after the surfaces of the rotating shaft 40 and the heat insulator 32 are effectively cooled, the air is discharged from the exhaust port 30b. In this case, the cylindrical portion 42c of the base frame 42 arranged so as to surround the peripheral side of the cooling fan 41 functions as a fan casing effective for guiding and introducing the cooling air.

As described above, it is quite effective to prevent the temperature of the base frame 42 formed of a resin having slightly lower heat resistance from being raised by cooling air. The base frame 42 may be deformed or deteriorated due to thermal effects even under adverse conditions such as a long-term use, particularly when the heating frequency of the heater 34 is used and the temperature is raised by a long-time continuous use. It is desired that the DC brushless motor 38 be stably mounted and fixed for a long time.

In this embodiment, however, the strip-shaped plate is
One end of a fixing member 43 formed into a V-shape is screwed to a rear wall 23a of the oven chamber 23 outside the hot air casing 31 with a screw 44, and the other end is connected to a base frame 42 via a heat-resistant resin member 45. The DC brushless motor 38 is mounted and fixed by being connected to the distal end of the cylindrical portion 42c, which is the extending end of the brushless motor 38. It is attached and fixed in a state where it is separated from.

Accordingly, the base frame 42 for holding the DC brushless motor 38 can be configured to be attached to the oven cabinet 23 side separated from the hot air casing 31 which is heated to the highest temperature by the heater 34, and the base frame 42 During this time, a sufficient heat gradient (temperature drop) can be ensured, and the temperature rise can be effectively prevented in combination with the fact that it does not receive direct heat conduction.
In addition, connecting portions (four places) between the base frame 42 and the fixing member 43
Has a tendency for the heat between the two to easily concentrate and become high temperature,
Since the resin member 45 having good heat resistance is interposed at the connection portion, there is no possibility that the heat is particularly exerted on the base frame 42 side. In addition, the connecting portion with the resin member 45 interposed therebetween and the fixing member 43 in the vicinity thereof are disposed in the cooling air path indicated by the arrow C, and are extremely advantageous because they receive the cooling effect by the cooling air.

As described above, according to the present embodiment, the DC brushless motor 38 provided to drive the hot air fan 33 and the cooling fan 41 and held by the resin base frame 42 having low heat resistance is used as the base frame. Four fixed members 4 connected to 42
3 and is fixed to the rear wall 23a, which is the oven storage 23, so that the hot air casing 31 is separated from the hot air casing 31 by an effective mounting structure effective for heat insulation. No communication is received.

Further, since the base frame 42 and the fixing member 43 are joined with the resin member 45 having high heat resistance interposed therebetween, heat is transmitted from the fixing member 43 side and the local connecting portion is connected. Even when heat is concentrated, the heat insulating effect on the resin base frame 42 side is excellent.
Since it is located in a so-called cooling air passage that is cooled by the cooling air indicated by the arrow C, it works more effectively to prevent the temperature from rising, and does not cause a problem due to heat concentration.

The base frame 42 and the fixing member 43 for mounting and fixing the DC brushless motor 38 extend in a direction perpendicular to the rotating shaft 40 (radial direction) and straddle the hot air casing 31. Since the axial dimension can be reduced and the motor 38 itself can be configured to be thin, the axial dimension including the motor 38 can be minimized, and the hot air generation unit 29 can be reduced in size by thinning. As a result, it is not necessary to make the cover member 30 project greatly rearward, so that the rearward projection dimension S1 can be reduced as compared with the conventional case, and the appearance is also good.

Therefore, in the mounting structure via the resin base frame 42 for holding the DC brushless motor 38, stable mounting and fixing can be performed without a risk of being adversely affected by heat. The depth dimension W1 in the front-rear direction of the heating cooker 21 as a product can be reduced to a minimum and the installation conditions can be relaxed and eased accordingly, and the volume ratio of the oven 23 to the entire product can be reduced. In addition, the DC brushless motor 38 can provide the heating cooker 21 which has a good driving efficiency, and has a function and effect suitable for actual use, such as reduction in power consumption and noise reduction. A base frame 42 and a fixing member 43 for mounting and fixing the DC brushless motor 38 are provided.
Is not limited to the above-described and illustrated shapes and connecting means, but can be variously modified.

4 and 5 show the second and third embodiments of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals. Is omitted,
Only the different parts will be described.

(Second Embodiment) FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
The C brushless motor 38 has a different mounting structure. Specifically, the C brushless motor 38 is mounted and fixed to the hot air casing 31 by using four fixing members 46 having a large thermal resistance. ◎ That is, the fixing member 46 is formed into a columnar shape by, for example, a ceramic material, one end of which is joined to the tip of the cylindrical portion 42c which is the extending end of the base frame 42 with an adhesive, and the other end of the hot air casing 31 The fixing member 46 is fixed to the heat shield plate 31a with screws 47, and the fixing member 46 is disposed in the cooling air passage near the outside of the cooling fan 33.

The operation of the second embodiment having such a structure will be described. The operation of the second embodiment will be described. In the heating cooking by circulation of the hot air, the hot air generated by the hot air generating unit 29 is circulated in the oven chamber 23 just like the first embodiment. By supplying, square plate 2
The objects to be cooked stored in the containers 4 and 25 (see FIG. 1) are simultaneously heated and cooked. Thus, a part of the heat generated by the heater 34 is directly transmitted to the fixing member 46 through the hot air casing 31. However, the fixing member 46 made of ceramic has a large thermal resistance and thus low thermal conductivity. In addition, since the cooling fan 41 is disposed in the cooling air path based on the cooling fan 41, the cooling air is effectively cooled by the cooling air indicated by the arrow D in FIG.
Does not suffer from adverse effects such as thermal deformation.

Therefore, the DC brushless motor 38 can be stably mounted and fixed to the hot air casing 31 via the fixing member 46, and the height dimension (axial dimension) of the fixing member 46 can be kept small. In addition to the thinning of the DC brushless motor 38 and the miniaturization of the hot air generating unit 29 as in the first embodiment, the rearward projection S1 can be reduced, and the depth of the product can be reduced as compared with the conventional case. It is possible to provide the heating cooker 21 whose dimensions (corresponding to W1 in FIG. 1) are reduced. In this embodiment, the ceramic fixing member 46 interposed between the base frame 42 and the hot air casing 31 is
Although the connecting means is fixed by an adhesive and a screw 47, the present invention is not limited to this. For example, a structure in which the connecting means is fitted to each other and a bonding means using an adhesive or sintering may be employed. In this case, various modifications are possible.

(Third Embodiment) Next, FIG. 5 is a view corresponding to FIG. 1 showing a third embodiment of the present invention. The mounting structure of the DC brushless motor 38 is different from that of the first embodiment. This is one in which the motor 38 is attached and fixed to the cover member 48 side. That is, for example, in this embodiment,
A protrusion 42d is formed at a square portion of the cylindrical portion 42c of the base frame 42,
On the other hand, the cover member 48 has a configuration in which a boss 48c is protruded at a position corresponding to the protrusion 42d, and the protrusion 42d is attached and fixed to the boss 48c by fitting with an adhesive.

In the case of such a configuration, the cylindrical portion 42c of the base frame 42
The tip is completely separated from the hot air casing 31 or the oven chamber 23 (rear wall 23a) on the high temperature side.
In addition, the cover member 48 has the intake port 48a and the exhaust port
8b, the cylindrical portion 42c surrounds the outer peripheral side of the cooling fan 41 to form a cooling air path also serving as a casing, and generates cooling air indicated by an arrow E.

Also in the third embodiment, as in the above-described first and second embodiments, oven cooking by circulation of hot air and DC brushless motor 38,
This has the effect of cooling the resin base frame 42 and the periphery of the outer surface of the hot air casing 31. In particular, in the present embodiment, the base frame 42 can be configured to be separated from the hot air casing 31 on the high-temperature side with a space therebetween, so that the factor for increasing the temperature of the base frame 42 is reduced as compared with the above embodiments. This is advantageous in that thermal effects can be reduced, and wasteful dissipation of heat from the heater 34, which is a heat source, can be prevented. Therefore, the heating efficiency of the heater 34 during cooking can be further increased.

As in the previous embodiments, the thermal effect can be eliminated and the hot air generating unit 29 can be reduced in size, and the rearward projecting dimension S1 and, therefore, the product depth dimension (corresponding to W1 in FIG. 1) ) Can be reduced and is suitable for practical use.
Can be provided. In this embodiment, the base frame 42 and the cover member 48 are attached and fixed by means of bonding and fitting. However, the present invention is not limited to this. For example, it is easy to use screwing means. Various modifications can be made when implementing the specific shape and the like.

In each of the above embodiments, the hot air casing 31 has a double structure composed of two heat shield plates 31a and 31b.
3 has been disclosed, and the hot air generation unit 29 having a higher heat shielding effect and a higher heating efficiency has been disclosed. However, these may be provided as needed. Although it is arranged on the rear part which is one side of the present invention, it may be arranged on the left or right side, and may be appropriately changed and implemented without departing from the gist of the present invention.

[0049]

As described above, according to the present invention, in the case where the hot air generating unit is provided on one side of the oven storage, the DC brushless motor constituting the unit can be stably mounted and fixed by avoiding thermal effects. Therefore, in combination with the fact that the features of such a motor can be effectively utilized, the hot air generating unit can be made thinner and smaller, and the heating efficiency during cooking can be improved by suppressing the dissipation of heat accompanying the heat generated by the heater. Thus, it is possible to provide a heating cooker having a practical effect of maintaining the temperature of the cooking device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing the overall schematic configuration.

FIG. 3 is a rear view of the hot air generation unit.

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 2 showing a conventional example.

[Explanation of symbols]

21 is a cooking device, 22 is an outer box, 23 is an oven, 2
3a is a rear wall (side wall), 29 is a hot air generation unit, 30 is a cover member, 31 is a hot air casing, 33 is a hot air fan, 34 is a heater, 35 is a suction port, 36 is an upper outlet,
37 is a lower outlet, 38 is a DC brushless motor, 40
Is a rotating shaft, 41 is a cooling fan, 42 is a base frame, 43, 46
Denotes a fixing member, and 45 denotes a resin member.

Claims (6)

[Claims] An apparatus for heating and cooking an object to be cooked by hot air supplied into an oven from a hot air generating unit provided on one side of an oven, wherein the hot air generating unit includes a heater and a hot air fan inside. A hot-air casing attached to a side wall of an oven chamber, and a DC brushless motor provided outside the hot-air casing to rotationally drive the hot-air fan via a rotating shaft. The resin base frame holding the motor is extended in the direction perpendicular to the axis, and the extended end and a fixing member arranged outside the hot air casing are connected and fixed. A cooking device characterized by the following. 2. The heating cooker according to claim 1, wherein the fixing member is disposed in a cooling air passage formed by a cooling fan provided between the hot air casing and the DC brushless motor. 3. The heating cooker according to claim 1, wherein a heat-resistant resin member is interposed at a connecting portion between the base frame and the fixing member of the DC brushless motor. 4. An apparatus for heating and cooking an object to be cooked by hot air supplied into an oven from a hot air generating unit provided on one side of an oven, wherein the hot air generating unit includes a heater and a hot air fan inside. A hot-air casing attached to the side wall of the oven chamber; a DC brushless motor provided outside the hot-air casing to rotationally drive the hot-air fan via a rotating shaft; and a hot-air attached to the rotating shaft. A cooling fan disposed between the casing and the DC brushless motor;
The C brushless motor is connected to a resin base frame holding the motor, is attached and fixed to the hot air casing via a fixing member made of a material having a high thermal resistance, and the cooling member is cooled by the cooling fan. A cooking device characterized by being placed on the road. 5. The cooking device according to claim 4, wherein the fixing member is formed of a ceramic material. 6. An apparatus for heating and cooking an object to be cooked by hot air supplied into an oven from a hot air generating unit provided on one side of an oven, wherein the hot air generating unit includes a heater and a hot air fan inside. A hot-air casing attached to a side wall of the oven chamber, and a DC brushless motor provided outside the hot-air casing to rotationally drive the hot-air fan via a rotary shaft. With a cover member that covers the
A cooking device wherein a resin base frame for holding the DC brushless motor is mounted and fixed to an inner surface of the cover member.