JPH06103100B2 - Hot air circulation cooker - Google Patents

Description

Description: [Object of the Invention] (Industrial field of application) The present invention relates to a hot-air circulation type cooker in which hot air is circulated in a heating chamber using a centrifugal fan for heating and cooking.

(Prior Art) A hot-air circulation type microwave oven (cooker) is provided with a casing 2 on the outer surface of the rear wall of a heating chamber 1 as shown in FIG. There is one in which a fan 3 and a heater 4 are provided.

In such a microwave oven, conventionally, as shown in FIG. 4, a suction port 5 (consisting of a large number of punching holes) is provided in the center of the rear wall, and the suction port 5 is blown at evenly upper and lower positions. A structure in which the outlets 6 (consisting of a large number of punching holes) are formed in strips is adopted.

Specifically, in the compartment between the casing 2 and the rear wall, a fan chamber that connects the suction port 5 and each of the air outlets 6 and 6 is formed,
As shown in FIG. 5, a hot air circulating fan 3 is provided in the fan chamber so as to face the suction port 5, and a substantially annular heater 4 is arranged between the outer peripheral portion of the fan and the outlets 6, 6. Adopted. However, the hot air circulating fan 3 is rotated by a fan motor 3a provided outside the casing 2.

Then, by operating the hot air circulation fan 3 and the heater 4, the air in the heating chamber 1 is sucked from the suction port 5 to heat it into hot air, and then it is blown into the heating chamber 1 from the outlets 6 and 6. The hot air is circulated.

Reference numeral 8 denotes a main body of the microwave oven, and 9 denotes a door for opening and closing the opening of the heating chamber 1.

However, these microwave ovens have a hot air circulation fan 3
Has a problem in that the hot air from the air outlets 6, 6 is biased toward the rotational direction side and is blown out. For this reason, uneven burning is likely to occur due to the unbalance of the hot air amounts on the left and right of the air outlets 6, 6. Specifically, when the rotating direction of the hot air circulation fan 3 is left, the left side of the upper outlet 6 indicated by A and the right side of the lower outlet 6 indicated by D are:
The amount of hot air tends to increase compared to the other portions indicated by B and C, and the uneven heat causes uneven food baking on the shelves 17, 17.

Therefore, recently, as shown in Japanese Patent Application No. 61-147540 filed by the present applicant, there has been proposed a device in which hot air is blown out uniformly from a blowout port using an air conditioning plate.

As shown in FIGS. 6 to 8, a strip-shaped air conditioning plate 10 is provided in a substantially radial pattern on the vicinity of the outer periphery of the hot air circulating fan 3 and on the fan reverse rotation direction side of the air outlet 6. The structure is used. It should be noted that in FIG. 6 to FIG. 8, the entire air-conditioning plate 10 is shown as a first air-conditioning plate portion 10a that crosses the outlet 6.
And a second air rectifying plate portion 10b that traverses the inside of the heater 4 are shown.

Then, the air conditioning plate 10 guides the hot air from the hot air circulation fan 3 toward the fan reverse rotation direction side of the air outlet 6 so as to make the amount of hot air from the air outlet 6 uniform (the first air conditioning plate portion 10a).
Guide with, fine adjustment with the second baffle plate 10b).

However, such a structure that equalizes the amount of hot air has a drawback that variations in the attachment of the hot air circulation fan 3 and the air rectifying plate 10 cause uneven burning to appear.

(Problems to be Solved by the Invention) That is, since the point S of the tip end portion of the second air-conditioning plate portion 10b (the portion to be the tip end of the air-conditioning plate 10) becomes the point of adjusting the hot air,
The fixed dimension between the point S at the tip of the air conditioning plate 10 and the shortest part T of the hot air circulating fan 3 (a constant dimension that is important for making the uneven burning uniform) is determined by mounting the hot air circulating fan 3 or the air conditioning plate 10. If it fluctuates, the amount of hot air flowing to the left and right sides of the air conditioning plate 10 will be greatly changed. Especially, hot air circulation fan 3, air conditioning plate 10
It is difficult to keep the dimension between S and T constant due to the variation in the attachment of No. 1, which is a factor that causes a large burning unevenness between products.

The present invention has been made in view of such a problem, and an object thereof is to suppress variations in baking unevenness to a minimum regardless of variations in attachment of a centrifugal fan and a baffle plate. It is to provide a hot-air circulating cooker.

[Structure of the Invention] (Means and Actions for Solving Problems) The present invention is provided with a bending portion 15 that bends along the rotational direction at the end of the air conditioning plate 10 on the centrifugal fan 3 side. Part 15
The surface of is used as the part for adjusting the flow of hot air, and centrifugal fan 3,
A change in the amount of hot air due to variations in mounting of the air flow control plate 10 is suppressed.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment shown in FIGS. 1 and 2. The drawings show the main parts of the present invention, and the structure other than the main parts of the present invention is the same as FIGS. 6 and 4 described in the above-mentioned "Prior Art", and therefore the description will be shared. Omitted, and this section will focus on the different parts.

That is, in one embodiment, the air conditioning plate 10 having the bent portion 15 at the tip is
Is different in that it adopted.

Specifically, the tip end of the second air rectifying plate portion 10b provided in the vicinity of the outer periphery of the hot air circulation fan 3 is extended to the hot air circulation fan 3 side, and the hot air circulation fan 3 moves from the original tip portion S to the hot air circulation fan 3 side. A structure in which the angle θ is inclined toward the fan rotation direction side with respect to the line connecting the axes is used. As a result, a bent portion 15 is formed at the tip of the second air rectifying plate portion 10b along the rotation direction of the hot air circulation fan 3 so as to bend in a substantially V shape. And
The second air rectifying plate 10b is such that hot air with the most uniform dimension between V and T can be obtained with reference to the intermediate portion V between the point S which is the base of the bent portion 15 and the point U which is the tip. The distance is set so that good baking can be obtained.

Then, when cooking food (not shown) using the hot air circulation type microwave oven configured as described above, the shelf 17 on which the food (not shown) is placed as shown in FIGS. 4 and 6 is used. Set on each of the upper and lower shelf supports 18,18. Then, after closing the door 9, the operation section (not shown) is operated. As a result, the fan motor 3a and the heater 4 are energized, and the hot air circulation fan 3 that rotates leftward is rotated.
Then, first, the central air in the heating chamber 1 is sucked into the casing 2 through the suction port 5. Next, a counterclockwise air vortex is drawn and flows out to the inside of the casing 2, whereupon it is heated by the heater 4 and becomes hot air. Then, this hot air guides the inclined surfaces of the inclined portions 2a, 2a, and the hot air blows through the outlets 6, 6 to the door 9
It is blown out to the side.

Here, the blowing direction of the hot air tends to be biased by the counterclockwise vortex generated inside the casing 2, but due to the rectifying action of the air rectifying plate 10 (action of induction and fine adjustment), each A,
Part of the hot air flowing toward the D point side is guided to the B and C point sides. As a result, the amount of hot air blown out from points B and C of each outlet 6, 6 is increased, and the amount of hot air blown out from points A and D is adjusted accordingly to decrease, and a uniform amount of hot air is obtained. It will be sent into the heating chamber 1.

Then, as shown by the arrows in FIG. 6, each hot air is sucked into the suction port 5 and circulates above the upper shelf 17, below the lower shelf 17, and further between the shelves 17, 17. The hot air heats the food.

Here, it is feared that the air conditioning plate 10 for adjusting the amount of hot air is greatly affected by variations in the installation of the hot air circulation fan 3 and the air conditioning plate 10, and the amount of hot air changes greatly.

However, according to the present invention, as shown in FIGS. 1 and 2, the air-conditioning plate 10 is provided with the bent portion 15 at the front end thereof, and the adjustment point is a surface instead of a point. This means that even if the mounting of the hot air circulation fan 3 or the air conditioning plate 10 varies to some extent, the amount of hot air on the left and right sides of the air conditioning plate 10 does not change much.

Therefore, it is possible to minimize variations in baking unevenness between products. Moreover, since only the bent portion 15 is provided, the structure is simple and the cost is advantageous.

Although the present invention is applied to the air-dividing plate divided into two in one embodiment, it may be applied to one other air-conditioning plate.

[Effects of the Invention] As described above, according to the present invention, the surface of the bent portion is used as a portion for adjusting the flow of the hot air, and it is possible to suppress the change in the hot air amount due to the variation in the attachment of the centrifugal fan and the baffle plate. become able to.

As a result, it is possible to minimize variations in baking unevenness between products regardless of variations in mounting. Moreover, since only the bent portion is provided, the structure is simple and the cost is low.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
The figure is a front view showing the surroundings of the casing, which is a main part, and Fig. 2 is an enlarged front view showing the air conditioning plate together with a centrifugal fan.
FIG. 3 is a side sectional view showing a general hot-air circulation type cooking device, FIG. 4 is a front sectional view thereof, FIG. 5 is a front view showing the casing thereof, and FIG. 6 is a reverse rotation around a centrifugal fan. FIG. 7 is a side cross-sectional view showing a hot-air circulation type cooker in which a wind regulating plate that guides hot air is installed on the side, FIG. 7 is a front view showing the surroundings of the casing, and FIG. 8 is an enlarged front view showing the wind regulating plate together with a centrifugal fan. There is a figure. DESCRIPTION OF SYMBOLS 1 ... Heating chamber, 2 ... Casing, 3 ... Hot air circulation fan (centrifugal fan), 4 ... Heater, 5 ... Suction port, 6 ... Blowing port, 10
b ... second air conditioning plate (air conditioning plate), 15 ... bent portion.

Claims (1)

[Claims] 1. A casing having a suction port at the center of the rear wall of the heating chamber, strip-shaped outlets provided at positions sandwiching the suction port, and a casing for connecting the suction port and the outlet to the back of the rear wall. In addition to the heater, a heater is provided in the casing, a centrifugal fan is provided facing the suction port, and an air conditioning plate for guiding the air from the centrifugal fan toward the fan reverse rotation direction of the outlet is provided near the outer periphery of the centrifugal fan. In the hot-air circulation type cooker, the baffle plate is provided in a substantially radial shape on the fan reverse rotation side of the air outlet, and has a curved portion bent along the rotation direction of the centrifugal fan at the end on the centrifugal fan side. A hot-air circulating cooker characterized by the following.