JP4875217B1 - Cooker - Google Patents

Abstract

[PROBLEMS] To improve the attraction performance of the exhaust from the cooking chamber, to reduce the blowing load of the driving airflow fan, to reduce the noise of the blower, and to suppress the failure due to the contact of the food to be cooked with the driving airflow fan, and stable over the long term And a cooking device capable of attracting exhaust from the cooking chamber.
A driving airflow duct having a driving airflow fan is disposed below an L-shaped cooking chamber exhaust duct that guides exhaust from a cooking chamber exhaust port to the outside of the casing, and the cooking chamber exhaust is exhausted. It has a structure in which a nozzle 31 is opened on the bottom surface of the duct 10. The nozzle 31 is formed so that at least a part of the area where the driving airflow fan 28 is projected on the bottom surface 10a of the cooking chamber exhaust duct 10 in the direction of the rotation axis does not overlap with the driving airflow fan 28 in plan view.
[Selection] Figure 11

Description

  The present invention relates to a heating cooker having a built-in cooking chamber in which a cooking chamber is heated by a heating element such as a heater and a heated object such as a fish is cooked or steamed.

  Conventionally, in a cooking device, the air in the cooking chamber is sucked by a fan, and the sucked air is passed through an exhaust air passage provided with an air cleaning means such as a filter containing an oxidation catalyst to reduce the concentration of pollutants. The exhaust is made out of the main body. During cooking in the cooking chamber, the cooking chamber is heated to a high temperature of 200 ° C. or higher. Therefore, when the air in the cooking chamber is directly sucked by a fan, the fan is made of heat-resistant parts such as metal, or fan driving means. There is a problem that durability and product cost are increased, for example, it is necessary to cool an electric motor or the like.

  In order to solve this problem, in recent years, a method has been proposed in which air in the cooking chamber is sucked without directly contacting a fan with exhaust in the cooking chamber using the principle of an air ejector (see, for example, Patent Document 1).

  In the technique of Patent Document 1, a driving airflow fan (axial fan) is used to suck air from outside the casing to generate a driving airflow, and the driving airflow is transferred from a driving airflow duct including the driving airflow fan to the upper surface thereof. The air is blown into the cooking chamber exhaust duct that communicates with the cooking chamber through the nozzle that is opened in the cooking chamber, and the air in the cooking chamber is sucked into the cooking chamber exhaust duct by the flow of the jetted air and discharged to the outside. .

JP 2010-43753 A (page 6, FIG. 3)

  However, in the heating cooker of Patent Document 1, the air path from the driving airflow fan to the nozzle is formed in an S shape, and the airflow from the driving airflow fan does not reach the nozzle linearly, and is bent twice. After that, the pressure reached the nozzle and pressure loss occurred. As a result, there has been a problem that the flow rate of the air ejected from the nozzle is reduced, a sufficient ejector effect cannot be obtained, and exhaust from the cooking chamber cannot be sufficiently induced.

  Thus, since there is much loss in ventilation of a driving airflow fan, the high ventilation capability was needed, the air blower load raised and the subject that an air blower noise increased also occurred.

  By the way, in a cooking device having an exhaust structure using the principle of this type of air ejector, liquid such as a cooking object spilled from a cooking pan during heating cooking enters the exhaust structure, and the cooking object into which the invasion has entered. Or the like may enter the driving airflow duct from the nozzle portion of the cooking chamber exhaust duct and come into contact with the driving airflow fan. In this case, the operation of the motor driving the driving airflow fan and the accompanying electric circuit will be hindered. Therefore, there is a need for protection measures for the driving airflow fan against liquids such as cooking objects.

  The present invention has been made to solve the above-described problems, and enhances the exhaust performance of the exhaust from the cooking chamber and reduces the blower load of the driving airflow fan to reduce the fan noise, thereby heating the cooker. An object of the present invention is to provide a heating cooker that can reduce the operation noise of the cooking chamber and further suppress the failure caused by the contact of the object to be cooked with the driving airflow fan and can stably induce the exhaust from the cooking chamber over the long term. And

  A cooking device according to the present invention includes a cooking chamber disposed in a casing, an L-shaped cooking chamber exhaust duct for guiding exhaust from the exhaust port of the cooking chamber to the outside of the casing, and a lower portion of the cooking chamber exhaust duct. The air outside the housing is sucked by driving a driving airflow fan provided inside, and the sucked air is jetted into the cooking chamber exhaust duct from the nozzle opened at the bottom surface of the cooking chamber exhaust duct. A driving airflow duct that draws air in the cooking chamber into the cooking chamber exhaust duct and discharges the air to the outside, and the nozzle is at least in a region projected on the bottom surface of the cooking chamber exhaust duct in the direction of the rotation axis of the driving airflow fan. It is formed so that it does not overlap with the driving airflow fan in plan view.

According to the present invention, the air path from the driving airflow fan to the nozzle is linear, the pressure loss is low, the air is blown with little loss, the flow velocity from the nozzle is increased, and the exhaust duct is smoothly discharged from the upper outlet. A flow can be formed. Therefore, the attraction performance is improved, the air blowing load of the driving airflow fan can be reduced, and the noise can be reduced.
In addition, the nozzle and the driving airflow fan should not be overlapped when viewed in plan, and the positional relationship between the nozzle and the driving airflow fan will not drop or contact directly with the driving airflow fan even if intrusion liquid drops from the nozzle. Can reduce the risk of failure.
By these, there exists an effect which can be set as the high-quality cooking device with low noise and long life.

It is a perspective view which shows the whole heating cooker which concerns on Embodiment 1, 2 of this invention. It is a perspective view of the main body 1 in a state where the top plate 4 and the intake / exhaust port cover 5 are removed from the upper side of the casing 2 of the cooking device of FIG. It is a perspective view of the main body 1 of the state which removed the induction heating coil unit 11 of FIG. FIG. 4 is a perspective view of a substrate case unit 15 on the right side of FIG. 3. It is a bottom perspective view which shows the whole heating cooker of FIG. It is a perspective view which shows the cooking chamber 7 of FIG. 5, and its exhaust structure part. It is a downward exploded perspective view of the catalyst unit 17, the cooking chamber exhaust duct 10 and the driving airflow duct 20 of FIG. FIG. 8 is an upper perspective view of the driving airflow duct 20 of FIG. 7. It is a top view of the drive airflow duct 20 of FIG. It is CC sectional drawing of FIG. It is AA longitudinal cross-sectional view of FIG. It is the figure which looked at the bottom face of the housing | casing 2 of FIG. 11 from the bottom. It is explanatory drawing of the shape and arrangement | positioning of the nozzle 31 of FIG. It is a perspective view for demonstrating the flow of the airflow in the drive airflow duct 20 and the cooking chamber exhaust duct 10 of FIG. It is BB sectional drawing of the catalyst unit 17 and the cooking chamber exhaust duct 10 of FIG. It is FIG. (1) which shows the example of another shape of the nozzle 31 of FIG. It is a figure (the 2) which shows the example of another shape of the nozzle 31 of FIG. It is FIG. (3) which shows the example of another shape of the nozzle 31 of FIG. It is a bottom perspective view which shows the whole heating cooker which concerns on Embodiment 2 of this invention. It is DD longitudinal cross-sectional view of FIG. It is a perspective view which shows the cooking chamber 7 of FIG. 19, and its exhaust structure part. FIG. 22 is a lower exploded perspective view of the catalyst unit 170, the cooking chamber exhaust duct 100, and the driving airflow duct 200 of FIG. FIG. 23 is an upper perspective view of the driving airflow duct 200 of FIG. 22. It is a top view of the drive airflow duct 200 of FIG. It is the figure which looked at the bottom of case 2 of Drawing 20 from the bottom. It is a perspective view for demonstrating the flow of the airflow in the drive airflow duct 200 and the cooking chamber exhaust duct 100 of FIG. It is a cross-sectional view of the catalyst unit 170 and the cooking chamber exhaust duct 100 of FIG. It is FIG. (1) which shows the example of another shape of the nozzle 310 of FIG. It is FIG. (2) which shows the example of another shape of the nozzle 310 of FIG. FIG. 28 is a third diagram illustrating an example of another shape of the nozzle 310 of FIG. 27;

Embodiment 1 FIG.
FIG. 1 is a perspective view showing the entire cooking device according to Embodiments 1 and 2 of the present invention. In the following description, front, back, top and bottom, left and right, and front and rear mean directions when the cooking device is viewed from the front side. Further, in FIG. 1 and each of the drawings described later, the same reference numerals are the same or equivalent, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements appearing in the entire specification are merely examples and are not limited to these descriptions.

(Heat cooker body)
In FIG. 1, the upper frame 3 is detachably disposed on the upper side of the casing 2 of the main body 1 of the heating cooker. An intake / exhaust port cover 5 is disposed on the back side of the upper frame 3, and a top plate 4 is disposed in the center. An object to be heated (not shown) is placed on the top plate 4. The intake / exhaust port cover 5 is air permeable, and the airflow of intake and exhaust passes smoothly. A front door 7a of a cooking chamber 7 to be described later is provided at the front center of the main body 1, and an operation unit 6 for instructing cooking in the cooking chamber 7, cooking control on the top plate 4, and the like are provided on the left and right sides thereof. In the first embodiment, the cooking can be performed not only in the cooking chamber 7 but also on the top plate 4. However, the cooking function on the top plate 4 may be mounted as necessary, and the upper surface of the main body 1 may be mounted. May be a simple exterior covering the cooking chamber 7.

FIG. 2 is a perspective view of the main body 1 in a state where the top plate 4 and the intake / exhaust port cover 5 are removed from the upper side of the casing 2 of the heating cooker of FIG. FIG. 3 is a perspective view of the main body 1 in a state in which the upper frame 3, the top plate 4, the intake / exhaust port cover 5, and the induction heating coil unit 11 on the right side of the front surface are removed.
A housing exhaust port 9 is provided in the center of the back side of the upper frame 3, and a housing intake port 8 is provided on the left and right of the housing exhaust port 9. The case exhaust port 9 is connected to the exhaust air passage 14 and exhausts the cooling air sucked from the case intake port 8 and passed through the case 2. A cooking chamber exhaust duct 10 communicating with the cooking chamber 7 is disposed in the exhaust air passage 14, and exhaust from the cooking chamber 7 is also performed from the housing exhaust port 9. The housing intake port 8 and the housing exhaust port 9 are covered with an intake / exhaust port cover 5 as shown in FIG.

  Below the top plate 4 from the top surface of the housing 2, induction heating coil units 11 are arranged on the left and right sides of the front side, and a radiant heater 13 is arranged in the center on the back side. Used for heating the object to be placed. A substantially circular chamber 16 is disposed below the induction heating coil unit 11 when viewed in plan. The chamber 16 is formed as an air path that guides air from a cooling fan 18 (see FIG. 4) provided in a substrate case unit 15 to be described later to the induction heating coil unit 11, and a plurality of air jets are provided on the upper surface thereof. The discharge hole 16a is formed. The induction heating coil unit 11, the radiant heater 13, and the chamber 16 are mounted according to the necessity of the cooking function on the top plate 4, and are not mounted when the cooking function is unnecessary.

  A cooking chamber 7 is disposed below the induction heating coil unit 11 and the radiant heater 13. The cooking chamber 7 includes the center of the front surface of the main body 1 and performs cooking such as baking and steaming, steam cooking, and the like in the space inside the cooking chamber 7. A substrate case unit 15 is disposed on each of the left and right sides of the cooking chamber 7.

  FIG. 4 is a perspective view of the substrate case unit 15 on the right side of FIG. The configuration of the left and right substrate case units 15 is substantially symmetrical, and here, the description will be made using the right substrate case unit 15. The substrate case unit 15 is formed as an integral air passage from the intake port 15 a communicating with the housing intake port 8 to the exhaust port 15 b communicating with the chamber 16. The exhaust port 15 b is connected to the chamber 16 with high airtightness, and efficiently guides the cooling air from the cooling fan 18 to the chamber 16.

  A cooling fan 18 and an electronic circuit board 12 are housed in the board case unit 15. In addition, a heat sink (cooling fin) may be housed in the substrate case unit 15 in order to increase the cooling efficiency of the heat generating component (electronic component) mounted on the electronic circuit board 12. The electronic circuit board 12 appropriately controls the induction heating coil unit 11, the radiant heater 13, the upper heating device 21 and the lower heating device 23 in the cooking chamber 7 according to the cooking content instructed by the operation of the operation unit 6 (drive timing and capability).・ Control output etc.).

  With the above configuration, when the start of heating cooking is instructed by the operation of the operation unit 6 and the cooling fan 18 is driven, the air outside the housing 2 passes through the air intake / exhaust port cover 5 and the housing air intake port 8, and the board case unit. The air is sucked in from the 15 intake ports 15a. The air sucked into the board case unit 15 cools the heat-generating component mounted on the electronic circuit board 12, and is then discharged from the exhaust port 15b. The air exhausted from the exhaust port 15 b flows into the chamber 16 and is then ejected from the plurality of discharge holes 16 a toward the induction heating coil unit 11.

  The air jetted toward the induction heating coil unit 11 cools the induction heating coil unit 11 and then flows while spreading in the housing 2, and then is collected in the exhaust air passage 14 on the back side and is exhausted to the housing exhaust port. 9 is exhausted out of the housing 2 through the intake / exhaust port cover 5. The temperature of the air exhausted from the intake / exhaust port cover 5 is a temperature at which no problem occurs even if a person touches the exhaust. By driving the cooling fan 18 to cool the inside of the housing 2 in this manner, the temperature inside the housing 2 due to cooking increases the function of each component inside the housing 2 and shortens the service life. Is avoiding.

(Cooking room 7, cooking room exhaust structure)
FIG. 5 is a bottom perspective view showing the whole cooking device of FIG. 1. FIG. 6 is a perspective view showing the cooking chamber 7 and its exhaust structure portion of FIG. 5 and shows a state where the upper surface of the cooking chamber 7 and the front door 7a are removed. FIG. 7 is a downward exploded perspective view of the catalyst unit 17, the cooking chamber exhaust duct 10, and the driving airflow duct 20 of FIG. 6.
The cooking chamber 7 includes an upper heating device 21 and a lower heating device 23, and heats an object to be heated placed on the cooking table 22 from the upper and lower directions at once with the upper heating device 21 and the lower heating device 23. . In the cooking chamber 7, a tray 24 is further arranged in the lower heating device 23. In addition, although it was set as the structure provided with the upper heating apparatus 21 and the lower heating apparatus 23 here, it is good also as a structure provided only with either one. Moreover, if the top and bottom of the object to be heated are reversed, the same cooking as when heating at a time from the top and bottom is possible, and the effect of the present invention can be obtained in the same manner regardless of the number and arrangement of heating devices. .

  Appropriate openings (not shown) are provided in the wall surface of the cooking chamber 7, the front door 7a, etc., and the outside air flows into the cooking chamber 7 with little pressure loss and without hindering the exhaust. 7 is exhausted to the outside of the cooking chamber 7 from a cooking chamber exhaust port 25 provided on the back wall surface of the cooking chamber 7.

  A cooking chamber exhaust structure 50 is connected to the outside of the cooking chamber exhaust port 25 via a catalyst unit 17. The cooking chamber exhaust structure 50 is connected to a cooking chamber exhaust duct 10 connected to the exhaust side of the catalyst unit 17 and a lower side of the cooking chamber exhaust duct 10, and has a driving airflow fan (for example, an axial fan) 28 inside. And a driving airflow duct 20 provided with. A nozzle 31 described later is opened on the surface of the cooking chamber exhaust duct 10 facing the driving airflow duct 20, and the cooking chamber exhaust duct 10 and the driving airflow duct 20 communicate with each other through the nozzle 31. The first embodiment is characterized by the shape and formation position of the nozzle 31, which will be described in the following explanation of the exhaust operation of the cooking chamber exhaust structure 50.

  In the cooking chamber exhaust structure 50, the driving airflow duct 20 can be exhausted without directly contacting the air in the cooking chamber 7 by the principle of an air ejector. That is, the airflow (exhaust) in the cooking chamber 7 is attracted into the cooking chamber exhaust duct 10 by blowing the driving airflow from the driving airflow fan 28 into the cooking chamber exhaust duct 10, and exhausted outside the cooking chamber exhaust structure 50. Like to do.

  Next, each structure of the catalyst unit 17, the cooking chamber exhaust duct 10, and the driving airflow duct 20 will be described in detail.

(Catalyst unit)
The catalyst unit 17 includes a catalyst body 27 inside. The catalyst body 27 is one in which one or more catalysts which are activated at a relatively low temperature, such as Mn or Pt, which can obtain catalyst activity at the exhaust temperature of the cooking chamber 7, are blended and attached to the catalyst body 27 base material.

  The catalyst body 27 is heated by the heat of the exhaust from the cooking chamber 7, radiation from the cooking chamber 7 such as the upper heating device 21 and the lower heating device 23, and the catalyst attached to the catalyst body 27 is activated. Is done. When the catalyst is activated, oily smoke and odor components are oxidatively decomposed to reduce the concentration and purify. Depending on the type of the catalyst body 27, there is a method different from that of the first embodiment, for example, a purification means by adsorption or combustion, but the purification means is not particularly limited and may have an exhaust purification function. That's fine.

(Cooking room exhaust duct)
The cooking chamber exhaust duct 10 has a three-dimensional shape that is substantially L-shaped, and includes a depth portion 10A extending from the front side to the back side and a vertical portion 10B extending upward from the depth portion 10A. The depth portion 10A has an inclined surface that becomes higher as the upper surface 10e moves rearward, and raises the exhaust gas along the inclination without disturbing the air buoyancy of the high-temperature air discharged from the cooking chamber 7, thereby cooking. It has the effect | action which assists the movement of the air to the vertical part 10B of the room exhaust duct 10. FIG. Further, a nozzle 31 made of a pentagonal hole is opened on the bottom surface 10 a of the cooking chamber exhaust duct 10.

(Drive airflow duct)
FIG. 8 is a top perspective view of the drive airflow duct 20 of FIG. FIG. 9 is a plan view of the drive airflow duct 20 of FIG. 10 is a cross-sectional view taken along the line CC of FIG.
The driving airflow duct 20 forms a vertical air path, and the lower end of the driving airflow duct 20 is a driving airflow inlet 30 and the upper end is a driving airflow outlet 20a. The driving airflow outlet 20a is connected to the bottom surface 10a of the cooking chamber exhaust duct 10 with good airtightness, and allows the airflow from the driving airflow fan 28 to flow into the nozzle 31 through the driving airflow outlet 20a.

  In the middle of the air passage of the driving airflow duct 20, a driving airflow fan holding portion 32 configured in a cylindrical shape with a substantially cross-sectional square shape matching the outer peripheral shape of the driving airflow fan 28 is formed integrally with the driving airflow duct 20. Yes. A driving airflow fan 28 is arranged and held in the driving airflow fan holding portion 32 in an inclined state so that the front side faces upward. As a holding structure, a flange 32 a is formed on a part of the front side of the driving airflow fan holding portion 32, and the inflow surface 28 a of the driving airflow fan 28 is supported by the flange 32 a to hold the driving airflow fan 28. Yes. The shape of the driving airflow fan holding portion 32 may be a shape that matches the shape of the driving airflow fan 28, and the substantially cross-sectional square shape is an example, and is not limited to this as long as the driving airflow fan 28 can hold. In the following description, in the driving airflow duct 20, the driving airflow suction port 30 side may be distinguished from the driving airflow fan 28 as the suction side duct 20A, and the driving airflow outlet 20a side may be distinguished as the ejection side duct 20B.

  The drive airflow fan holding part 32 forms a water storage part 40 over the entire outer periphery of the drive airflow fan 28 between the inner peripheral surface of the drive airflow duct 20. A part of the water storage section 40 faces the nozzle 31 formed in the cooking chamber exhaust duct 10 in the vertical direction (see FIG. 11 described later), and the object to be cooked that has entered the driving airflow duct 20 from the nozzle 31. Collect the liquid. Further, the bottom surface of the water storage section 40 is inclined, and a drain port 35 for discharging a liquid such as an object to be cooked is provided at a portion having the lowest inclination.

  Further, an anti-vibration material or an airtight material is inserted between the inner periphery of the drive airflow fan holding portion 32 and the outer periphery of the drive airflow fan 28 as necessary, so that vibration absorption and transmission of the drive airflow fan 28 can be suppressed. , To suppress airflow leakage and circulation. Further, a part of the mounting hole or the like of the driving airflow fan 28 is closed with an airtight material to improve airtightness, and the circulation of the airflow in the driving airflow duct 20 is suppressed.

  A fastening portion 33 is provided on a connection surface of the driving airflow duct 20 with the cooking chamber exhaust duct 10, and the fastening portion 33 fastens the cooking chamber exhaust duct 10 with a fastening member 34 such as a screw (see FIG. 6). The part 33 is fastened.

(Disposition relationship, driving airflow inlet)
Next, the positional relationship in the housing | casing 2 of the cooking chamber exhaust duct 10 and the drive airflow duct 20 is demonstrated.

11 is a vertical cross-sectional view taken along the line AA of FIG. FIG. 12 is a view of the bottom surface of the housing 2 of FIG. 11 as viewed from below.
On the bottom surface 2 a of the housing 2, a plurality of generally circular external driving airflow suction ports 19 are opened so as to face the driving airflow suction ports 30 of the driving airflow duct 20 disposed in the housing 2. And the vertical part 10B of the drive airflow suction port 19 outside a housing | casing, the drive airflow duct 20 (suction side duct 20A), the drive airflow fan 28, the drive airflow duct 20 (spout side duct 20B), the nozzle 31, and the cooking chamber exhaust duct 10 are as follows. As shown by the straight line L1, it is arrange | positioned substantially linearly. Therefore, the driving airflow drawn by the driving airflow fan 28 and sucked from the outside driving airflow suction port 19 is smoothly guided upward in the cooking chamber exhaust structure 50 with little increase in pressure loss due to the bending of the air passage. Then, the air is exhausted out of the housing 2 through the upper surface opening 10 f of the cooking chamber exhaust duct 10 and the housing exhaust port 9.

  In addition, the inclination of the driving airflow fan 28 is set to be close to the inclination of the straight line L1, so that the axial component of the driving airflow from the driving airflow fan 28 is almost parallel to the air path and does not cause unnecessary pressure loss, and the efficiency is improved. Good ventilation is possible. In addition, the suction region 19a in which the plurality of outside-drive airflow suction ports 19 are formed is wider than the inflow surface 28a of the drive airflow fan 28, and the passing air speed is reduced to reduce pressure loss.

  Further, since the driving airflow fan 28 is inclined so that the front side is directed upward, the distance between the driving airflow fan 28 and the bottom surface 2a of the housing 2 becomes closer to the back side. The main body 1 is used by being incorporated in a system kitchen or the like, and the lower portion of the main body 1 may be used as a drawer storage space that slides in the front-rear direction and opens and closes. In this case, when the drawer storage space is opened and closed, the tapered tip of the chopsticks or chopsticks stored in the storage space may be pushed into the drive airflow duct 20 via the drive airflow inlet 19 outside the housing. . If the tapered tip of the pressed chopsticks or chopsticks contacts the impeller of the driving airflow fan 28, the impeller stops rotating and the airflow cannot be attracted, or the impeller of the driving airflow fan 28 breaks down and breaks down. Sometimes Therefore, in the first embodiment, a configuration for avoiding this is adopted. This configuration will be described below.

  In order to shorten the length of the chopsticks entering the outside-drive airflow inlet 19, the hole diameter of the outside-drive airflow inlet 19 may be reduced. When the hole diameter of the outside-drive airflow suction port 19 is, for example, about 3 mm in diameter, the length that a general chopstick enters into the hole is about 1 cm at the tip. Therefore, the driving airflow fan 28 may be arranged so that the shortest distance between the impeller of the driving airflow fan 28 and the outside-drive airflow suction port 19 is 1 cm or more.

  However, when the hole diameter of the outside-drive airflow suction port 19 is 3 mm, the suction pressure loss increases because the suction hole is small. In view of this, the hole diameter of the drive airflow suction port 19 outside the housing is set to, for example, a diameter of 3 mm at a portion where the distance from the impeller of the drive airflow fan 28 is close, and increases as the distance increases. The range of expansion of the hole diameter may be such that chopsticks or the like do not contact the impeller and the pressure loss can be suppressed within an allowable range, for example, about 6 mm at the maximum. Accordingly, it is possible to suppress the rotation stop / damage of the impeller due to the insertion of chopsticks or the like into the external drive airflow suction port 19 while reducing an excessive increase in pressure loss.

  In addition, about the front-back direction of the suction area | region 19a, the hole diameter of the drive airflow suction port 19 outside a housing | casing is changed, and it is the same diameter about the left-right direction of the suction area | region 19a. However, in the left and right outer areas of the suction area 19a, the area facing the driving airflow fan 28 (the outside airflow inlet opening forming area where the chopped chopsticks may come into contact with the driving airflow fan 28) However, as the distance from the left and right end faces of the impeller increases, the hole diameter may be increased within a range where chopsticks and the like do not contact the impeller.

(Exhaust operation of cooking chamber exhaust structure)
Next, details of the exhaust operation of the cooking chamber exhaust structure 50 will be described. In the first embodiment, the rotational direction of the driving airflow fan 28 is clockwise when viewed from the front side, and the shape and arrangement of the nozzle 31 described below and the flow of the airflow in the cooking chamber exhaust structure 50 are driven. This corresponds to the case where the rotation direction of the airflow fan 28 is clockwise.

  Here, the shape and arrangement position of the nozzle 31 deeply related to the exhaust operation of the cooking chamber exhaust structure 50 will be described with reference to FIG.

(nozzle)
FIG. 13 is an explanatory view of the shape and arrangement of the nozzle 31 of FIG. In FIG. 13, the drive airflow fan 28 is indicated by a dotted line in order to clarify the positional relationship between the nozzle and the drive airflow fan 28.
The nozzle 31 has a slit shape extending in the left-right direction (the front-rear direction in FIG. 13), is formed shorter than the width in the left-right direction of the cooking chamber exhaust duct 10, and is spaced from the right side surface 10b of the cooking chamber exhaust duct 10. Is provided. The nozzle 31 is provided at a distance from the back surface 10 d of the cooking chamber exhaust duct 10. Further, the right side of the front side 31a of the nozzle 31 is an inclined side 31c, and the right side portion in the nozzle 31 is tapered toward the rear side 31b toward the right end. The effects obtained by forming the nozzle 31 in such a shape will be described later.

  Moreover, the arrangement position of the nozzle 31 on the bottom surface of the cooking chamber exhaust duct 10 is a position that satisfies the following two conditions. The first condition is that at least a part of the nozzle 31 is arranged so as to cover a region S where the driving airflow fan 28 is projected on the bottom surface 10a of the cooking chamber exhaust duct 10 in the direction of the rotation axis. The second condition is that it is arranged at a position that does not overlap with the driving airflow fan 28 in plan view.

  By satisfying the first condition, the air path between the driving air flow fan 28 and the nozzle 31 becomes approximately linear, and pressure loss can be reduced. In addition, by satisfying the second condition, it is possible to prevent the liquid such as the cooking object dripped from the nozzle 31 from directly contacting the driving airflow fan 28.

  The shape and arrangement position of the nozzle 31 when the rotation direction of the driving airflow fan 28 is clockwise are as described above. However, when the rotation direction of the driving airflow fan 28 is counterclockwise, the cooking chamber exhaust duct 10 is arranged. The shape and arrangement are reversed left and right around the center line in the left and right direction.

(Airflow in the cooking chamber exhaust structure)
Next, the flow of the airflow in the cooking chamber exhaust structure 50 will be described with reference to FIGS. 14 and 15 based on the result of the fluid analysis.

  FIG. 14 is a perspective view for explaining the flow of airflow in the driving airflow duct 20 and the cooking chamber exhaust duct 10 of FIG. 7. 15 is a cross-sectional view of the catalyst unit 17 and the cooking chamber exhaust duct 10 of FIG. In FIG. 15, in order to clarify the positional relationship between the nozzle and the driving airflow fan 28, the driving airflow fan 28 is indicated by a dotted line.

  The airflow flowing out from the driving airflow fan 28 includes an axial component and a swirling component, and the swirling direction A1 of the airflow flowing out from the driving airflow fan 28 is the same as the rotation direction of the driving airflow fan 28 in plan view. It is around.

  As shown in FIG. 14, the airflow having the swirling component a <b> 1 flowing out from the driving airflow fan 28 passes through the left side in the nozzle 31 and is ejected to the cooking chamber exhaust duct 10, and faces toward the back of the cooking chamber exhaust duct 10. It becomes an air flow and flows upward in the vertical portion 10B while attracting air in the cooking chamber 7, and flows from the middle of the vertical portion 10B along the back surface 10d of the vertical portion 10B to the outside through the upper surface opening 10f. Is done.

  By the way, various effects can be obtained by adopting the shape and arrangement of the nozzle 31 as shown in FIG. 13. This effect is substantially the same as the width of the left and right of the cooking chamber exhaust duct 10. It becomes clear by comparing with the case of the rectangular nozzle. Therefore, here, the flow and problems of the air flow when the rectangular nozzle is used will be clarified.

  The driving airflow that has flowed out of the driving airflow fan 28 generally flows in the turning direction A1, but the airflow that contacts the back surface 20b of the driving airflow duct 20 passes through the nozzle 31 and then travels in a direction significantly different from the turning direction A1. The airflow collides with the right side surface 10b of the cooking chamber exhaust duct 10 (hereinafter referred to as the first airflow). This is because the direction of the swirl component a2 of the airflow that contacts the back surface 20b of the drive airflow duct 20 is greatly changed by the contact with the back surface 20b of the drive airflow duct 20 to become the swirl component a3. After passing through the nozzle 31, the first airflow becomes an airflow toward the right side surface 10 b of the cooking chamber exhaust duct 10, and forms an airflow that hinders exhaust from the cooking chamber 7 due to the following two points.

  The first point is that the first air current collides with the right side surface 10b of the cooking chamber exhaust duct 10 in a state where the flow velocity is high immediately after the first air flow is ejected through the right side from the center in the rectangular nozzle. The second point is that the swirl component included in the airflow near the right side surface 10b of the driving airflow duct 20 includes a component toward the cooking chamber 7 side (front side). Due to the above two points, the first air flow causes a flow that flows back to the cooking chamber 7 side in the vicinity of the right side surface 10 b on the back side of the cooking chamber exhaust duct 10, and the flow is on the bottom surface 10 a side of the cooking chamber exhaust duct 10. Then, the airflow is directed toward the back surface 10d, and as a result, a vortex is formed in the cooking chamber exhaust duct 10, and this vortex hinders the exhaust from the cooking chamber 7.

In order to suppress the flow that hinders the exhaust from the cooking chamber 7 generated in this way, in the first embodiment, the nozzle 31 has the shape and arrangement shown in FIG. It is trying to suppress going to the right side surface 10b direction. Hereinafter, the effect of having the shape and arrangement shown in FIG. 13 will be described.
The nozzle 31 is provided at a distance from the right side surface 10b of the cooking chamber exhaust duct 10, and the distance between the nozzle 31 and the right side surface 10b is separated to make it difficult for the airflow from the nozzle 31 to collide with the right side surface 10b, and the distance is increased. Thus, the loss of contact with the wall surface was reduced by changing the flow velocity immediately after jetting from the nozzle 31 from a fast state to a slow state.

  Further, since the right side of the nozzle 31 is tapered, the flow rate on the right side in the nozzle 31 can be further reduced, and collision is further suppressed. In addition, since the tip of the tapered shape is closer to the rear side, the inclined side 31c intersects the turning component a3 at an acute angle θ1, so that an upward component that is substantially perpendicular to the inclined side 31c is present in the airflow near the inclined side 31c. a4 is seen, forms a flow that opposes the swirl component a3, and relaxes the swirl component a3. Therefore, the flow velocity component toward the right side surface 10b of the cooking chamber exhaust duct 10 is slowed as a flow of the entire air flow when the air flow having the component a4 that relaxes the swirl component a3 merges with another air flow passing through the nozzle 31. The flow of the airflow becomes a direction close to vertical. In other words, the flow hindering the exhaust from the cooking chamber 7 is reduced, and the exhaust from the cooking chamber 7 is smoothly exhausted from the upper surface opening 10 f of the cooking chamber exhaust duct 10.

  Further, by providing the nozzle 31 at a distance from the right side surface 10b of the cooking chamber exhaust duct 10, the exhaust from the cooking chamber 7 side wraps around the back side of the nozzle 31 as indicated by an arrow a5. This facilitates the attraction of exhaust on the back side of the nozzle 31.

 Further, by providing the nozzle 31 at a distance from the back surface 10d of the cooking chamber exhaust duct 10, the airflow on the back side from the nozzle 31 in the cooking chamber exhaust duct 10 is also used for attraction, and the attraction effect can be enhanced. Conversely, when the nozzle 31 is provided close to the back surface 10d of the cooking chamber exhaust duct 10, in other words, the position of the back surface 10d of the cooking chamber exhaust duct 10 in the structure of FIG. In the case of the same position in the depth direction, the airflow used for attraction is reduced and the incentive effect is reduced.

(Operation of the heating cooker)
Next, the operation of the cooking device will be described. Here, an operation when cooking in the cooking chamber 7 mainly related to the present invention is instructed will be described.
When cooking in the cooking chamber 7 is selected by operating the operation unit 6, the cooling fan 18 and the driving airflow fan 28 are driven, and energization and power of the upper heating device 21 and the lower heating device 23 in the cooking chamber 7 are controlled. Then, the object to be heated placed on the cooking table 22 is cooked. The driving timing of each of the cooling fan 18, the driving airflow fan 28, the upper heating device 21, and the lower heating device 23 varies depending on the cooking menu, but here, a state where all are driven will be described.

  Although the temperature in the cooking chamber 7 varies depending on the cooking menu, as an example, when the upper and lower heating devices 21 and 23 are heated to 500 to 800 ° C., the temperature becomes about 200 to 300 ° C. For this reason, even if the wall surface of the cooking chamber 7 is provided with a certain heat insulating means, the temperature in the housing 2 rises due to radiation and heat transfer. Therefore, when the cooking chamber 7 is used, the cooling fan 18 is driven to prevent the components in the casing 2 from functioning and the life from being shortened due to the temperature rise in the casing 2. Each component in 2 is cooled so as to be a heat resistant temperature or lower. The flow of air in the housing 2 by driving the cooling fan 18 is as described above.

  In the cooking chamber 7, the object to be heated placed on the cooking table 22 is cooked by driving the upper heating device 21 and the lower heating device 23. The object to be heated may be a raw material such as fish, or may be wrapped or stored in a cooking container or the like. As cooking progresses, oily smoke and odor components are generated from the food that is to be heated. Oil smoke and odor components may be generated directly from the object to be heated, or may be generated when the juice or fat from the food material comes into contact with the tray 24 or the lower heating device 23 and volatilizes. The oily smoke and odor components generated in this manner are diffused in the cooking chamber 7 and are attracted to the catalyst unit 17 from the cooking chamber exhaust port 25 by the driving airflow described above. The airflow including the oil smoke and odor component attracted by the catalyst unit 17 is partly purified by the catalyst body 27 of the catalyst unit 17 to reduce the concentration of the oil smoke and odor component, and then the concentration is reduced. Attracted into the exhaust structure 50.

  The action and operation by the effect of the air ejector in the cooking chamber exhaust structure 50 is as described above, and the exhaust from the cooking chamber 7 attracted into the cooking chamber exhaust structure 50 does not contact the driving airflow fan 28 and the casing 2. Exhausted outside.

  Here, liquids such as to-be-cooked items spilled on the upper surface of the housing 2 due to spillage or cooking operation errors caused by cooking (hereinafter referred to as intrusion liquid) are the upper surfaces of the intake / exhaust port cover 5 and the cooking chamber exhaust duct 10. Consider the case of entering the cooking chamber exhaust duct 10 through the opening 10f. In this case, the intruding liquid that has entered the cooking chamber exhaust duct 10 drops from the nozzle 31 into the driving airflow duct 20 and is collected in the water storage unit 40.

  Since the water storage section 40 is formed over the entire outer periphery of the driving airflow fan 28, the intrusion liquid directly dripped from the nozzle 31 is stored in the water storage section 40 as well as from the nozzle 31 to the driving airflow duct 20. Intrusion liquid that flows along the rear surface 20b of the cooking chamber, and intrusion liquid that flows downward along the peripheral surface of the cooking chamber exhaust duct 10 after flowing along the rear surface of the bottom surface 10a of the cooking chamber exhaust duct 10 (see FIG. 11). The water storage unit 40 can collect the water. In addition, since the nozzle 31 and the driving airflow fan 28 are arranged at positions where they do not overlap each other in plan view (see FIG. 11), the intruding liquid that drops downward from the nozzle 31 drops into the water storage section 40 below the nozzle 31. However, it does not drip onto the driving airflow fan 28 that is displaced from below the nozzle 31. For this reason, the failure due to the intrusion liquid coming into contact with the driving airflow fan 28 can be reduced. In addition, although it is preferable that the water storage part 40 is formed in the outer periphery whole periphery of the drive airflow fan 28, it is good also as a shape which abbreviate | omitted one part.

  Further, the upper surface opening 10f of the cooking chamber exhaust duct 10 is substantially flush with the upper surface of the exhaust air passage 14 (see FIG. 2), and the exhaust from the cooking chamber 7 exits from the upper surface opening 10f of the cooking chamber exhaust duct 10. Immediately, the air is discharged from the housing exhaust port 9 to the outside of the housing 2. Thereby, the intrusion liquid contained in the exhaust from the cooking chamber 7 can be prevented from diffusing into the exhaust air passage 14 and contaminating the inside of the housing 2.

  As described above, in the first embodiment, at least a part of the nozzle 31 covers the region 31 where the driving airflow fan 28 is projected onto the bottom surface 10a of the cooking chamber exhaust duct 10 in the rotation axis direction. The air path from the driving airflow fan 28 to the nozzle 31 is a straight air path. Thereby, it can suppress that the airflow from the drive airflow fan 28 is inhibited like the case where it is set as the conventional S-shaped air path, and pressure loss can be reduced.

  By reducing the pressure loss in this way, the jet air flow velocity from the nozzle 31 is increased, the effect of the air ejector is improved, and a flow that is smoothly exhausted from the upper surface opening 10f of the cooking chamber exhaust duct 10 is formed. It is possible to enhance the performance of attracting exhaust from the cooking chamber 7. As a result, the air blowing load of the driving airflow fan 28 can be reduced, and a low-noise heating cooker can be obtained.

  Further, not only the air path between the nozzle 31 and the driving air flow fan 28 but also the entire air path extending from the outside driving air flow suction port 19 to the upper surface opening 10f of the cooking chamber exhaust duct 10 is approximately linear, and the driving air flow fan 28 was arranged so as to have an inclination close to the inclination of the straight line. As a result, the axial component of the airflow from the driving airflow fan 28 is substantially parallel to the air path, and efficient air blowing can be performed without causing unnecessary pressure loss. As a result, the air blowing load of the driving airflow fan 28 can be reduced, and a low-noise heating cooker can be obtained.

  Further, since the nozzle 31 and the driving airflow fan 28 are arranged so as not to overlap with each other in plan view, the intruding liquid from the nozzle 31 can be prevented from dripping into the driving airflow fan 28 and can enter the driving airflow fan 28. It is possible to reduce malfunctions caused by liquid contact. As a result, the induction / purification of the exhaust gas is maintained, and a high-quality cooker with high reliability and long life can be obtained.

  Moreover, since the water storage part 40 is formed over the outer periphery of the drive airflow fan 28, the bottom surface 10a (of the cooking chamber exhaust duct 10 as well as the intruding liquid directly dripping from the nozzle 31 to the water storage part 40 is provided. The intruding liquid flowing downward along the peripheral surface of the cooking chamber exhaust duct 10 after flowing along the back surface of FIG. As described above, in the first embodiment, since the intrusion liquid other than the direct drop from the nozzle 31 to the water storage section 40 can be recovered, the recovery ratio of the intrusion liquid is increased, and as a result, the failure suppression effect of the driving airflow fan 28 is improved. In addition, the cooking device can be a reliable and long-life and high-quality cooking device.

  Moreover, since the nozzle 31 is provided at a distance from the right side surface 10b of the cooking chamber exhaust duct 10, the distance from the right side surface 10b of the cooking chamber exhaust duct 10 can be increased. Therefore, it is possible to suppress the jet flow having a high flow velocity immediately after being ejected from the nozzle 31 from colliding with the right side surface 10b. Therefore, it is possible to suppress the lowering of the attracting performance due to the collision, the ejector effect / attracting performance is increased, the blower load is reduced, the blower noise is lowered, and a low-noise heating cooker can be obtained.

  Further, by providing the nozzle 31 at a distance from the right side surface 10b of the cooking chamber exhaust duct 10, an exhaust inflow path from the cooking chamber 7 side to the back side of the nozzle 31 is secured, and the cooking chamber exhaust duct 10 Since the back surface 10d is also provided at an interval, the surface on the back surface 10d side of the jet flow by the driving airflow that flows into the cooking chamber exhaust duct 10 from the nozzle 31 can also function as an air ejector. Therefore, the attracting effect on the back surface 10d side can be enhanced, and the attracting performance is improved.

  Further, since the right side portion of the nozzle 31 is tapered toward the right end, the flow rate on the right side in the nozzle 31 can be reduced, and the collision can be further suppressed to further improve the attraction performance. .

  Further, since the tip of the tapered shape on the right side of the nozzle 31 is closer to the rear side 31b, that is, the right side of the front side 31a of the nozzle 31 is set to the inclined side 31c so as to intersect the turning direction A1 of the driving airflow fan 28 at an acute angle. The swirl component a3 of the airflow passing through the right side in the nozzle 31 is relaxed. As a result, the flow velocity component in the direction of the right side surface 10b of the cooking chamber exhaust duct 10 becomes slow, and the flow of the airflow is in a direction close to vertical. In other words, the flow hindering the exhaust from the cooking chamber 7 can be reduced, the ejector effect / attraction performance is increased, the blower load is reduced, the blower noise is lowered, and a low noise heating cooker can be obtained.

  Further, by increasing the hole diameters of the plurality of external drive airflow suction ports 19 provided on the bottom surface 2a of the housing 2 from those closer to the drive airflow fan 28 from the impeller, pressure loss It is possible to suppress the stop, damage, or failure of the driving airflow fan 28 due to insertion of chopsticks or the like from the hole while reducing the excessive rise of the airflow. As a result, the reliability is high, the fan load can be reduced, and a low-noise heating cooker can be obtained.

  The shape of the nozzle 31 is not limited to the shape shown in FIG. 13, and the shape can be changed as long as the nozzle 31 is formed so as to satisfy the following arrangement conditions (1) and (2). In addition, (3) to (6) are arranged and clearly described about the characteristic part of the nozzle of FIG.

(1) At least a part of the nozzle 31 is provided so as to cover the region S where the driving air flow fan 28 is projected on the bottom surface 10a of the cooking chamber exhaust duct 10 in the axial direction.
(2) It does not overlap with the driving airflow fan 28 in plan view.
(3) The right side surface 10b of the cooking chamber exhaust duct 10 (corresponding to the surface facing the turning direction A1 of the driving airflow fan 28. When the rotation direction of the driving airflow fan 28 is counterclockwise, the left side surface 10c). Are provided at intervals.
(4) It is provided with a space between the rear surface of the cooking chamber exhaust duct 10 (corresponding to the surface facing the cooking chamber exhaust port 25) 10d.
(5) The right side of the nozzle 31 (corresponding to the turning direction A1 side of the driving air flow fan 28. When the rotation direction of the driving air flow fan 28 is counterclockwise, the left side) is tapered.
(6) The tapered tip on the right side of the nozzle 31 is set closer to the rear side 31b, and the right side of the front side 31a of the nozzle 31 intersects the turning direction A1 of the driving air flow fan 28 at an acute angle.

  The nozzle 31 has an appropriate shape depending on the arrangement of the driving airflow fan 28, the shape of the driving airflow duct 20, the position of the nozzle 31, and the shape of the cooking chamber exhaust duct 10, but the swirl component a3 is alleviated. As long as it is a nozzle shape or a nozzle shape that suppresses the passage flow rate of the first airflow, another shape as shown in FIGS. 16 to 18 below may be used as long as the above condition (5) or (6) is satisfied.

(Example of different nozzle shape)
Examples of nozzle shapes that relieve the swirl component a3 (see FIG. 14) and other shapes of nozzle shapes that control the flow rate of the first airflow (the airflow that collides with the right side surface 10b of the cooking chamber exhaust duct 10) include: A specific configuration example is shown.
16 to 18 are diagrams illustrating examples of different shapes of the nozzles 31. The shape shown in FIGS. 16 to 18 is an example of another shape when all of the above five points are satisfied.
FIG. 16 shows an example in which the right side portion in the nozzle 31 has a tapered shape that gradually decreases toward the right end. FIG. 17 shows an example in which the tapered portion of the nozzle 31 is inclined to the back side. FIG. 18 shows an example in which the tapered portion of the nozzle 31 is curved to the back side. Even in the case of these shapes, the same effect as described above can be obtained.

Embodiment 2. FIG.
The cooking device of the second embodiment is different from the first embodiment in the configuration, shape, and the like of each of the catalyst unit, the cooking chamber exhaust duct, the driving airflow duct, and the housing. The rest is the same as in the first embodiment, and in the following, the parts of the second embodiment different from the first embodiment will be mainly described.

  The heating cooker according to the second embodiment has the same configuration as shown in FIGS.

  FIG. 19 is a bottom perspective view showing the whole heating cooker according to Embodiment 2 of the present invention. FIG. 20 is a DD longitudinal sectional view of FIG. FIG. 21 is a perspective view showing the cooking chamber 7 and its exhaust structure portion of FIG. 19 and shows a state where the upper surface of the cooking chamber 7 and the front door 7a are removed. FIG. 22 is a lower exploded perspective view of the catalyst unit 170, the cooking chamber exhaust duct 100, and the driving airflow duct 200 of FIG.

(Catalyst unit)
The catalyst unit 17 of the first embodiment is configured to purify a part of the exhaust components without using a dedicated heating device. However, the catalyst unit 170 of the second embodiment has a catalyst heating device 26 on the cooking chamber 7 side. It has. For example, a sheathed heater is used as the catalyst heating device 26. The catalyst heating device 26 is disposed in front of the catalyst body 27, and radiatively heats the catalyst body 27 and heats exhaust gas flowing into the catalyst body 27 to convectively heat the catalyst body 27. As the catalyst to be attached to the catalyst body 27 of the second embodiment, Pd or the like that obtains catalytic activity at a temperature higher than that of the Mn of the first embodiment is used, and Mn that has low heat resistance is not used. Pt has catalytic activity from a lower temperature and has the same heat resistance as Pd, and is used alone or in combination.

  In the catalyst unit 170 of the second embodiment, the temperature of the catalyst body 27 can be made higher than that of the first embodiment by providing the catalyst heating device 26. Therefore, the reaction rate of oxidative decomposition can be increased, and more exhaust gas can be emitted. The components can be decomposed and purified to increase the cleanliness of the exhaust.

(Cooking room exhaust duct)
Unlike the first embodiment, the cooking chamber exhaust duct 100 has a shape in which the cross-sectional area of the air passage is substantially the same from the front side to the back side, unlike the first embodiment. Further, the depth portion 10A is inclined upward toward the back side as a whole, and the vertical portion 10B of the cooking chamber exhaust duct 100 is heated by air buoyancy in the cooking chamber 7 as in the first embodiment. Has the effect of leading to

  On the bottom surface 10a of the cooking chamber exhaust duct 100, a nozzle 310 is formed for enhancing the ejector effect and improving the attraction performance as in the first embodiment. In other words, the nozzle 310 of the second embodiment is composed of the nozzle 31 of the first embodiment provided with a shielding portion 311 and divided into left and right parts, and is configured by two nozzles. The requirements of (6) are satisfied. The operation and effect of the nozzle 310 will be described later. First, the components of the cooking chamber exhaust duct 100 other than the nozzle 310 other than those of the first embodiment will be described.

(Bottom (inclined surface) of cooking chamber exhaust duct)
In the second embodiment, the following effects can be obtained by using the bottom surface 10a of the cooking chamber exhaust duct 100 as an inclined surface having a higher back side.

  Due to the inclined surface, the distance between the bottom surface 10a of the cooking chamber exhaust duct 100 and the driving airflow fan 28 increases as the distance from the rear surface increases. For this reason, the flow rate when the airflow from the driving airflow fan 28 contacts the bottom surface 10a is slower on the back side. Therefore, the pressure loss can be reduced as compared with the case where the bottom surface 10a is not inclined and is approximately horizontal at the same height as the front surface side. Moreover, the fact that the longitudinal cross-sectional area of the airflow duct 200 of the drive airflow duct 200 increases toward the back side also contributes to a decrease in pressure loss.

  Further, since the bottom surface 10a is an inclined surface, the airflow from the driving airflow fan 28 is easily guided to the nozzle 310 as compared with a horizontal plane, and as a result, pressure loss can be reduced.

  Thus, by making the bottom surface 10a of the cooking chamber exhaust duct 100 an inclined surface whose back side is higher, the loss in the air path from the driving airflow fan 28 to the nozzle 310 is reduced, and as a result, the ejection from the nozzle 310 is reduced. The attraction performance can be improved by increasing the flow velocity.

  In other words, the bottom surface 10a of the cooking chamber exhaust duct 100 has a high inclined surface on the back surface side, so that the cooking chamber 7 side has a low inclined surface. Hereinafter, the effect obtained by this will be described.

  Since the bottom surface 10a is an inclined surface on which the cooking chamber 7 side is lowered, the intruding liquid that has circulated from the nozzle 310 to the back surface of the bottom surface 10a (the surface on the driving airflow duct 200 side) passes through the bottom surface 10a of the cooking chamber exhaust duct 100. When flowing through, the flow rate of the intruding liquid increases and flows smoothly to the front surface 20c of the ejection side duct 20B, and dripping onto the driving airflow fan 28 on the way to the front surface 20c is suppressed. Therefore, it is possible to reduce a failure due to the intruding liquid coming into contact with the driving airflow fan 28 and to provide a highly reliable long-life cooking device. Here, the entire bottom surface 10a of the cooking chamber exhaust duct 100 is inclined. However, a region including at least the nozzle 310 and the region facing the driving airflow duct 200 may be inclined so that the nozzle 310 side becomes higher. .

  Further, on the bottom surface 10 a of the cooking chamber exhaust duct 100, a water storage unit inlet 37 is opened on the back side of the nozzle 310 so as to face the upper surface opening 10 f of the cooking chamber exhaust duct 100. Since the effect of providing the water storage unit inlet 37 is the same as the effect of the water storage unit 41 described later provided in the drive airflow duct 200, it will be described later.

(Drive airflow duct)
FIG. 23 is an upper perspective view of the driving airflow duct 200 of FIG. 24 is a plan view of the drive airflow duct 200 of FIG.

(Water reservoir)
A water storage unit 41 that collects intrusion liquid from the water storage unit inlet 37 of the cooking chamber exhaust duct 100 is provided outside the back side of the driving airflow duct 200. The water reservoir 41 is formed independently of the air path inside the driving airflow duct 200.

  In addition, a drain port 42 is provided at the lowermost part of the water storage unit 41. When the intruding liquid spilled on the upper surface of the housing 2 enters the cooking chamber exhaust duct 100, it is collected in the water storage unit 41 through the water storage unit inlet 37 and discharged out of the water storage unit 41 from the drain port 42. The intrusion liquid or the like discharged outside the water storage unit 41 is discharged out of the housing 2 from the outside-drive airflow inlet 190.

  In this way, by arranging the water reservoir inlet 37 and the water reservoir 41 below the vertical portion 10B of the cooking chamber exhaust duct 100, the intrusion liquid that has entered the vertical portion 10B mainly drops from the water reservoir inlet 37. It is possible to suppress the entry to the drive airflow duct 200 as much as possible through the nozzle 310 disposed in front of the water reservoir entrance 37. As a result, it is possible to reduce a failure due to the intruding liquid contacting the driving airflow fan 28 and to provide a highly reliable long-life cooking device.

  Further, the driving airflow outlet 20a of the driving airflow duct 200 has a shape that is inclined upward toward the back side in accordance with the inclination of the bottom surface 10a of the cooking chamber exhaust duct 100, and the water storage section 41 and the cooking chamber exhaust duct are formed. 100 water reservoir inlets 37 are connected in a substantially watertight manner. As a configuration for obtaining a watertight connection, for example, a sealing material that enhances airtightness and watertightness may be sandwiched between the driving airflow duct 200 and the cooking chamber exhaust duct 100.

  Moreover, you may make it join between the upper surface of the drive airflow duct 200, and the bottom face 10a of the cooking chamber exhaust duct 100 on both sides of the material which has the property of vibration proof or heat insulation. When the vibration isolating material is sandwiched, the vibration associated with the operation of the driving airflow fan 28 can be absorbed and blocked, and the noise can be reduced. Further, when the heat insulating material is sandwiched, the heat insulating cost for the driving airflow duct 200 can be reduced. Specifically, in manufacturing the driving airflow duct 200, it is necessary to use a resin having high heat resistance that can withstand a temperature rise due to exhaust from the cooking chamber 7, as a material. Therefore, it is possible to use an inexpensive resin with a reduced grade of property, and the cost can be reduced.

(Drive airflow inlet in the housing)
In the suction-side duct 20A of the drive airflow duct 200, an in-housing drive airflow suction port 29 that communicates the drive airflow duct 200 with the space in the outer housing 2 is opened at the bottom of the left and right side surfaces. . Hereinafter, functions and effects obtained by providing the in-casing driving airflow suction port 29 will be described.

  By providing the drive airflow inlet 29 in the housing, the suction side of the drive airflow duct 200 communicates with the housing 2, so that not only the air outside the housing 2 but also the air in the housing 2 is driven by the drive airflow duct. It will be sucked into 200. By the way, the pressure inside the housing 2 is higher than that outside the housing 2 because the air outside the housing 2 is forced by the cooling fan 18. For this reason, when the air is sucked into the driving airflow duct 200, the air in the housing 2 can be sucked with a lower load than the air outside the housing 2. Therefore, by providing the drive airflow suction port 29 in the housing to suck the air in the housing 2, the suction load can be reduced, and the amount of air blown by the drive airflow fan 28 can be increased. As a result, the flow velocity of the airflow ejected from the nozzle 310 can be increased. In addition, the fan noise is reduced by reducing the suction load, and a low-noise heating cooker can be obtained.

  Note that the temperature inside the housing 2 is higher than the temperature outside the housing 2 during cooking. For this reason, the temperature of the driving airflow fan 28 is increased by newly sucking the air in the housing 2 into the driving airflow duct 200. Therefore, the driving airflow fan 28 is required to have heat resistance that can withstand the temperature after the increase, but the cost increases to achieve high heat resistance. Therefore, if the ratio of the suction air volume from the outside drive airflow inlet port 190 and the suction air volume from the inside drive airflow inlet port 29 is adjusted to reduce the air temperature after merging in the drive airflow duct 200, A low-cost fan with a low heat-resistant temperature can be used.

(Outside housing airflow inlet)
FIG. 25 is a view of the bottom surface of the housing 2 of FIG. 20 as viewed from below. Hereinafter, the suction area 190a of the bottom surface 2a of the housing 2 will be described with reference to FIG. 25 and FIG.
In the second embodiment, the suction region 190a is protruded downward, and the position of the suction region 190a is lower than the surrounding bottom surface 2a. Thereby, the following effects are acquired.

  In the suction area 190a, there is a difference in wind speed in the front-rear direction in the suction area 190a, and the inflow air speed on the rear side, which is close to the driving airflow fan 28, is faster than the inflow air speed on the front side. Therefore, by reducing the position of the suction region 190a and increasing the distance from the inflow surface 28a of the driving airflow fan 28, the inflow air speed can be reduced as a whole. In particular, lowering the inflow air speed on the rear side where the inflow air speed is fast leads to reduction of pressure loss, and the fan load can be reduced.

  In addition, since the distance from the inflow surface 28a of the driving airflow fan 28 is increased by lowering the position of the suction region 190a, the opening area of the outside driving airflow suction port 19 can be increased. As a result, the pressure loss can be reduced, the fan load can be reduced, and a low-noise heating cooker with low fan noise can be obtained.

  Further, since the position of the suction region 190a is lower than the surrounding bottom surface 2a portion, the intruding liquid discharged from the drain port 42 of the water storage section 41 and flowing into the suction region 190a is applied to other portions of the bottom surface 2a of the housing 2. It does not flow out. Therefore, it is possible to reduce a failure due to the intrusion liquid coming into contact with the components such as the electronic circuit board 12 and to obtain a highly reliable long-life cooking device.

  In the first embodiment, the opening of the outside-case drive airflow suction port 19 is substantially circular, but in the second embodiment, it is a slit-like long hole extending in the left-right direction. As a result, the aperture ratio increases, the passing wind speed decreases, the pressure loss decreases, and the fan load can be reduced. Further, the width in the depth direction of the long holes constituting the outside drive airflow suction port 19 is increased as the distance from the impeller of the drive airflow fan 28 is closer to the farther one. The effect of such a configuration is the same as that of the first embodiment, and it is possible to suppress the stop or damage of the driving airflow fan 28 due to insertion of chopsticks or the like, and it is possible to reduce the failure of the driving airflow fan 28 and to improve reliability. It can be a high heating cooker.

  In the second embodiment, the slit width in the left and right direction of the outside-drive airflow suction port 19 is the same in the left and right direction of the suction region 190a, but may be as follows. That is, in the suction region 190a, the region on the left and right outer sides of the region facing the driving airflow fan 28 has a slit width within a range in which chopsticks or the like do not contact the impeller as it becomes farther from the left and right end surfaces of the impeller in the left-right direction. May be enlarged.

(nozzle)
FIG. 26 is a perspective view for explaining the flow of airflow in the driving airflow duct 200 and the cooking chamber exhaust duct 100 of FIG. 27 is a cross-sectional view of the catalyst unit 170 and the cooking chamber exhaust duct 100 of FIG.
The airflow flowing out from the driving airflow fan 28 includes an axial component and a swirling component, and the swirling direction A1 of the airflow flowing out from the driving airflow fan 28 is the same as the rotation direction of the driving airflow fan 28 in plan view. It is around. Hereinafter, the flow of the airflow in the clockwise direction will be described based on the result of the fluid analysis. The configuration and effect of the flow of airflow in the nozzle 310 are basically the same as those of the nozzle 31 of the first embodiment, and points that should be particularly noted in the nozzle 310 of the second embodiment will be described below.

  As described above, the nozzle 310 is configured by dividing the nozzle 31 of the first embodiment into left and right, and is configured by two nozzles. The divided positions are the first airflow and the other airflow (hereinafter referred to as the second airflow). The boundary portion with the airflow) is defined as the division position.

  In the second embodiment, the following operational effects can be obtained by using the nozzle configuration divided at the above-described division positions.

  The first air flow and the second air flow can be separately passed by the nozzle 310A and the nozzle 310B. Therefore, each of the nozzle 310A and the nozzle 310B can be appropriately arranged and shaped according to the airflow passing through the inside. Thereby, the flow of ejection from the nozzle 310A and the nozzle 310B can be controlled, and the attracting performance can be enhanced.

  Moreover, the space | interval part between the nozzle 310A and the nozzle 310B becomes the inflow path of the exhaust_gas | exhaustion from the cooking chamber 7 attracted to the back side of the nozzle 310. FIG. For this reason, when compared with the first embodiment where only the gap portion between the right end of the nozzle 310 (the right end of the nozzle 310A) and the right side surface 10b of the cooking chamber exhaust duct 100 is the inflow path, it is between the nozzles 310A and 310B. However, securing the inflow path increases the inflow of exhaust gas and contributes to the improvement of the attraction performance.

  It should be noted that the opening area of the nozzle 310 that can achieve good attraction performance is in a range determined according to the airflow and static pressure characteristics of the driving airflow fan 28. When the nozzles satisfying the range are filled with two divided nozzles, the total outer peripheral length can be made longer than when the nozzles are filled with one nozzle. That is, it is possible to increase the contact area with the exhaust that is attracted, which also contributes to the enhancement of the attraction performance.

  Further, since the divided side (right side) 31e of the left nozzle 310B intersects the turning direction A1 of the driving airflow fan 28 at an acute angle θ2, an airflow a6 directed to the left side is seen on the divided side 31e, and this airflow causes the nozzle The flow passing through the central portion in 310B is converged to the left side, the cross section of the air current is narrowed, and the flow velocity is increased. Thereby, the ejection speed from the nozzle 310B can be increased, and the attraction performance is improved.

  As described above, the attraction performance is increased, so that the load on the blower can be reduced and a low-noise heating cooker can be obtained.

(Operation of the heating cooker)
In the above configuration, the basic operation when the cooking in the cooking chamber 7 is instructed is the same as that of the first embodiment, and the same operational effects can be obtained.

  As described above, according to the second embodiment, the same operational effects as those of the first embodiment can be obtained, and the above-described operational effects can be obtained by the components different from the first embodiment.

(Example of different nozzle shape)
The nozzle 310 of the second embodiment is composed of nozzles 310A and 310B divided into two left and right at the boundary portion between the first airflow and the second airflow, as described in the first embodiment (1), As long as the requirements of at least two points in (2) are satisfied, other shapes such as those shown in FIGS. 28 to 30 may be used. Even in the case of these shapes, the same effect as described above can be obtained. The shape shown in FIGS. 28 to 30 is an example of another shape when all of the above (1) to (6) are satisfied.

  In any of the other shape examples in FIGS. 28 to 30, the right nozzle 310 </ b> A has a shape closer to the back side than the left nozzle 310 </ b> B. With this shape, even if the airflow passing through the right nozzle 310A is inclined toward the cooking chamber 7 due to the swirl component, the airflow can flow into the generally vertical portion 10B, and the depth portion 10A of the cooking chamber exhaust duct 100 can be obtained. Can be mitigated from colliding with the upper surface 10e.

  In the example of another shape of FIGS. 28 to 30, the side (right side) 31 f on the divided side of the left nozzle 310 </ b> B changes linearly or curvilinearly in a direction in which the left-right width of the nozzle 310 </ b> B decreases toward the rear. I am letting. By setting it as this shape, the effect | action which raises the flow velocity by making the cross-sectional area | region of the airflow which passes the nozzle 310B small compared with the shape of FIG. 27 shows the tendency to increase. Similarly, as shown in FIG. 30, the side (left side) 31e opposite to the division side in the nozzle 310B may be changed linearly or curvedly in a direction in which the left-right width of the nozzle 310B decreases as it goes rearward. In this case, it shows a tendency to increase the speed and attract by the convergence of the airflow.

  Moreover, although each Embodiment 1 and 2 demonstrated as another embodiment, you may comprise a heating cooker combining the characteristic structure of each embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 Heating cooker main body, 2 housing | casing, 2a bottom face, 3 upper frame, 4 top plate, 5 intake / exhaust port cover, 6 operation part, 7 cooking chamber, 7a front door, 8 housing inlet port, 9 housing exhaust port 10, cooking chamber exhaust duct, 10A depth portion, 10B vertical portion, 10a bottom surface, 10b right side surface, 10c left side surface, 10d back surface, 10e top surface, 10f top surface opening, 11 induction heating coil unit, 12 electronic circuit board, 13 radial heater , 14 Exhaust air path, 15 Substrate case unit, 15a Intake port, 15b Exhaust port, 16 chamber, 16a Discharge hole, 17 Catalyst unit, 18 Cooling fan, 19 Outside-case drive air flow inlet, 19a Intake region, 20 Drive air duct , 20A Suction side duct, 20B Ejection side duct, 20a Drive airflow outlet, 20b Back surface, 20c Surface, 21 Upper heating device, 22 Cooking table, 23 Lower heating device, 24 Receptacle, 25 Cooking chamber exhaust port, 26 Catalyst heating device, 27 Catalyst body, 28 Drive airflow fan, 28a Inflow surface, 29 Drive airflow inlet in the housing , 30 Drive airflow inlet, 31 Nozzle, 31a Front side, 31b Rear side, 31c Inclined side, 31d Right side, 31e Split side, 32 Drive airflow fan holding portion, 32a Flange, 33 Fastening portion, 34 Fastening member, 35 Drainage port (First drainage port), 37 water storage unit inlet, 40 water storage unit (first water storage unit), 41 water storage unit (second water storage unit), 42 drainage port (second drainage port), 50 cooking chamber exhaust structure, 100 cooking Room exhaust duct, 170 catalyst unit, 190 outside-drive air suction port, 190a suction area, 200 drive air duct, 310 nozzle, 310A nozzle, 310B nozzle, 311 shielding part.

Claims (12)

A cooking chamber arranged in the housing;
A side view L-shaped cooking chamber exhaust duct for guiding the exhaust from the exhaust port of the cooking chamber to the outside of the housing;
The cooking chamber exhaust duct is disposed below the cooking chamber exhaust duct, sucks air outside the housing by driving a driving airflow fan provided inside, and from the nozzle that opens the sucked air to the bottom surface of the cooking chamber exhaust duct. And a drive airflow duct that draws air into the cooking chamber and draws the air in the cooking chamber into the cooking chamber exhaust duct and discharges it outside.
The nozzle is formed such that at least a part of a region where the driving airflow fan is projected onto the bottom surface of the cooking chamber exhaust duct in the direction of the rotation axis does not overlap with the driving airflow fan when viewed in plan. A heating cooker characterized by that.   A plurality of external airflow intake ports outside the housing that are formed on the bottom surface of the housing and through which external air sucked by the drive airflow fan passes, the drive airflow duct including the drive airflow fan, the nozzle, 2. The drive airflow fan is disposed in the casing such that the upper surface opening of the cooking chamber exhaust duct is substantially linearly arranged, and the straight line and the rotation axis are substantially parallel to each other. The cooking device described.   The nozzle is provided at a distance from at least one of a surface facing the exhaust port of the cooking chamber and a surface facing the swirl direction of the driving airflow fan among the components constituting the cooking chamber exhaust duct. The heating cooker according to claim 1 or 2, wherein the cooking device is provided.   The said nozzle is formed in the slit shape extended in the width direction of the said cooking chamber exhaust duct, The turning direction side of the said drive airflow fan has a tapered shape, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The heating cooker according to item.   The side of the inner periphery of the nozzle that faces the turning direction of the driving airflow fan is formed so as to intersect the airflow in the turning direction of the driving airflow fan at an acute angle. Item 5. The cooking device according to any one of items 4 to 4.   The cooking device according to any one of claims 1 to 5, wherein the nozzle is divided by providing a shielding portion.   Between the outer periphery of the driving airflow fan and the inner periphery of the driving airflow duct, a first water storage part that collects intrusion liquid flowing from the nozzle is formed, and a first drainage is formed at the lowermost part of the first water storage part. The cooking device according to any one of claims 1 to 6, wherein a mouth is provided.   A water reservoir inlet is opened on the bottom surface of the cooking chamber exhaust duct so as to face the upward upper opening of the cooking chamber exhaust duct, and the water reservoir inlet outside the driving airflow duct is opposed to the water reservoir inlet. The second water storage part that collects the intruding liquid from the water is provided, and the second drainage port is provided at the lowermost part of the second water storage part, according to any one of claims 1 to 7. Cooking cooker.   The region of the bottom surface of the cooking chamber exhaust duct including at least the region facing the nozzle and the driving airflow duct is inclined so that the nozzle side becomes higher. The cooking device according to any one of the above.   The suction side of the driving airflow duct is communicated with the inside of the casing, and a cooling fan is provided in an area other than the cooking chamber in the casing. The cooking device according to any one of claims 1 to 9, wherein the cooking device is sucked into the cooking chamber.   The opening area of each of the plurality of external drive airflow inlets that are formed on the bottom surface of the housing and through which the air outside the housing sucked by the drive airflow fan passes is close to the impeller of the drive airflow fan. The cooking device according to any one of claims 1 to 10, wherein a farther one is enlarged.   2. An area that protrudes downward is provided on the bottom surface of the casing, and a plurality of outside-drive airflow inlets through which the outside air sucked by the drive airflow fan passes are provided in the area. The cooking device according to any one of claims 11 to 11.

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