JPH0810630B2 - High frequency heating equipment - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a high frequency heating apparatus having two magnetrons.

2. Description of the Related Art An example of a conventional high-frequency heating device will be described with reference to FIGS.

FIG. 3 is a top view of a conventional high-frequency heating apparatus, and FIG. 4 is a rear view of the same high-frequency heating apparatus. 5 is a diagram in which only FIG. 4 is removed so that internal components can be seen.

In FIGS. 3 and 4, reference numeral 4 denotes a heating chamber provided inside the main body of the high-frequency heating apparatus. The heating chamber 4 is provided with a door 6 for taking in and out the object to be heated so that it can be opened and closed. Two magnetrons 2 provided outside the rear wall of the chamber 4.
The high frequency wave generated in 1 is guided to the heating chamber 4 by the waveguides 5 provided above and below the heating chamber 4, respectively. Especially, high-frequency heating devices for commercial use are required to have high output,
In that case, several magnetrons 2 of 700W to 1KW class are operated in parallel from the viewpoint of the capability of the current magnetron or the reliability as a high frequency heating device, instead of producing high output with one magnetron. By doing so, high output is obtained. Further, the high voltage transformers 3 and the cooling fans 1 for the magnetrons are provided in the number corresponding to the respective magnetrons 2. The higher the output of the high-frequency heating device, the larger the size of the parts. Therefore, it is difficult to reduce the size of the high-frequency heating device with a high output in terms of space of parts. In order to realize this high output and downsizing, it is an important point how to arrange the components around the magnetron 2 so as not to impair the performance of the high frequency heating device. In FIGS. 3 and 4 showing a conventional high-frequency heating device, the air that has cooled the magnetron 2 passes through the exhaust guide 11 and is discharged to the outside of the main body through the exhaust holes 7 on the back surface. The high voltage transformer 3 is placed on the side surface of the heating chamber 4.

Further, FIG. 5 is a top view of a conventional high-frequency heating device, and FIG. 6 is a rear view of the same high-frequency heating device, with the high-frequency heating device main body cabinet removed as described above. The background provided with two magnetrons is the same as in the description of FIGS. 3 and 4, and the parts having the same reference numbers are the same parts and the parts having the same functions. In FIG. 5 and FIG. 6, one magnetron 2 is attached to each of the backsides of the main bodies of the waveguides 5 arranged on the left and right of the upper surface of the heating chamber 4. An air guide 13 for passing the air that has cooled the magnetron 2 is arranged between the left and right magnetrons 2. The wind of the air guide 13 is sucked by the exhaust fan 12 and discharged to the outside of the high-frequency heating apparatus main body through the exhaust hole 7. Gas, water vapor, etc. generated in the heating chamber is also introduced into the air guide 13 by providing a punching hole on the rear surface of the heating chamber, and is discharged through the exhaust hole 7 together with the air passing through the magnetron 2. The punching hole 14 on the upper surface of the heating chamber is a vent hole for allowing air to flow into the heating chamber 4. The high voltage transformers 3 are respectively arranged below the magnetrons 2.

Problems to be Solved by the Invention First, in the conventional configuration shown in FIGS. 3 and 4, the space in which the components on the back side of the heating chamber 4 are placed is the exhaust guide 11 of the magnetron 2, the magnetron 2 and the cooling for cooling it. Since the fan 1 is installed, these spaces occupy almost the entire space, and the arrangement of the high-voltage transformer 3 is such that the cooling fan 1, magnetron 2, Place it further behind the exhaust guide 11, or the upper and lower exhaust guides 11, or
It is either placed in the space between the upper and lower cooling fans 1 or arranged on the side surface of the heating chamber 4. When the high-voltage transformer 3 is placed between the upper and lower exhaust guides 11 or between the upper and lower cooling fans, the heavy high-voltage transformer 3 needs to be held at a high position in the high-frequency heating device, which makes it unstable. When placed on the side surface of the heating chamber 4, there is a problem with the installation location of the high-frequency heating device, because the size of the main body on the left and right is large due to the presence of the high-voltage transformer 3 when viewed from the front of the high-frequency heating device.
Therefore, a large installation frontage of the high-frequency heating device is required, which is disadvantageous in reducing the installation frontage of the installation location to save space. Further, the exhaust guide 11 not only impairs the space in which the parts are inserted into the main body, but also because the high temperature air that has cooled the magnetron 2 passes through it, the self-confidence also becomes high and the temperature inside the main body is raised carelessly. Have.

Further, in the conventional configuration shown in FIGS. 5 and 6, the high-voltage transformer 3, the magnetron 2, and the exhaust fan 12 are gathered together in the space on the back side of the heating chamber 4, so that the size can be reduced more than the conventional configuration. Although it is possible to cool the magnetron 2, the exhaust fan 12 allows cooling air to flow from the left and right side magnetrons 2 to cool the magnetron 2 and then the air fan 13 to the outside of the high frequency heating device through the air guide 13. The exhaust fan 12 has the following problems because the steam and gas in the heating chamber 4 are also exhausted through the exhaust hole 7 and similarly through the exhaust fan 12.
In other words, because two magnetrons 2 are cooled by 12, one exhaust fan, it is necessary to use an exhaust fan with a large power that can cool two magnetrons 2, and one is sufficient, but it is expensive and one magnetron cooling It is larger than the exhaust fan. As a result, because of the exhaust fan 12, there is a possibility that a large space on the back side of the high-frequency heating device can be taken by the exhaust fan. As the exhaust fan becomes larger, the fan motor that drives it becomes less versatile.
The higher the high frequency output of the high frequency heating device, the higher
With one exhaust fan, there is no choice but to use a dedicated fan motor. With this method, it seems empirically that a high-frequency output of about 1.4 KW can be used for a general-purpose fan motor in a commercial high-frequency heating device for North America. In the exhaust fan 12, as described above, the steam, gas, etc. in the heating chamber 4 are exhausted together with the hot air after cooling the magnetron 2.
In order to pass through the 12 fan blades and the fan case, the fan blades and the fan case must be made of a material such as metal that can withstand a high temperature, which is a factor that makes the exhaust fan 12 expensive and the inside of the heating chamber 4 Contamination of the fan blades and fan case due to steam or gas causes a bad odor unless the contamination can be maintained. Further, regarding the heating distribution, since the power supply to the heating chamber 4 at two locations is only on the upper surface of the heating chamber 4, the vertical balance is poor and the heating distribution is inferior to the conventional example shown in FIGS.

 The conventional configuration has the above-mentioned problems.

The present invention solves the above-mentioned problems and aims at saving space in the installation site by reducing the installation frontage at the time of installation, in particular, because the high-frequency output is high, the heating distribution is good, the price is low, and the external dimensions are small. Another object of the present invention is to provide a high-frequency heating device.

Means for Solving the Problems In order to solve the above problems, the high-frequency heating apparatus of the present invention has two magnetrons, each of which has a power transformer (high-voltage transformer) and a cooling fan of the magnetron, Arrange the parts as follows. The magnetrons are arranged vertically so that power is fed to the upper and lower surfaces of the heating chamber by a waveguide at the rear of the high-frequency heating chamber.The left and right arrangements are such that the upper and lower magnetrons are located at the center of the heating chamber in the left-right direction. And The cooling fans of the magnetron are arranged on the left and right of the upper magnetron, and the power transformers of the magnetron are arranged on the left and right of the cooling fan.

Operation With the above-mentioned configuration, the waveguide is installed in the center of the upper and lower surfaces of the heating chamber substantially on the left and right, and in the vertical feeding of microwaves to the heating chamber, it is in a good position to eliminate uneven heating in the heating chamber. Magnetrons are attached to the rear end of the high frequency heating device of the upper and lower waveguides, respectively, and the upper and lower magnetron co-cooling exhaust ports are connected to one of the cooling fans located on the left and right of the upper magnetron in the front-back direction of the high frequency heating device. The upper magnetron is connected by the upper air guide, and cooling air is sent to the upper magnetron. Similarly, the remaining cooling fans of the left and right cooling fans and the lower magnetron are also coupled by the lower air guide to send the cooling air to the lower magnetron. Both the upper and lower magnetrons are connected to the exhaust port of the magnetron and the rear cabinet of the high-frequency heating device main body in a size as short as possible to exhaust the magnetron exhaust from an exhaust hole provided in the main body rear cabinet. (This is a factor that makes it possible to reduce the size of the high-frequency heating apparatus main body, and the fact that the exhaust passage is short reduces exhaust resistance, so that the cooling effect of the high-frequency heating apparatus is improved.) Left and right 2 Since two cooling fans are installed above the high-frequency heating device, it is possible to put a heavy high-voltage transformer below the cooling fans. Exhaust of steam and gas generated in the heating chamber is provided on either side of the upper air guide or the lower air guide with an opening hole in the rear part of the heating chamber which is in contact with the air guide, and divides the air blow to the magnetron to heat the air. I put the air from the cooling fan into the room,
Then, if holes are provided at any place other than the air guides on the upper and lower sides of the heating chamber, the air can be discharged. Exhaust of vapor and gas from the holes of the heating chamber can be easily exhausted by arbitrarily connecting the cabinet of the high frequency heating device with an exhaust guide. In addition, the magnetron, cooling fan, and high-voltage transformer are housed in the space on the back side of the heating chamber as a lump, and the cooling fan is located above these parts and close to the exhaust port of the high-frequency heating device body. Therefore, the parts can be cooled efficiently.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view of a high-frequency heating apparatus showing an embodiment of the present invention, and FIG. 2 is a rear view of the same high-frequency heating apparatus. The side cabinet is a view in which only the parts shown in FIG. 4 are removed so that the internal parts can be seen. The same parts as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, the waveguide 5 on the upper surface of the heating chamber 4 is located substantially at the center on the left and right of the heating chamber 4, and the waveguide 5 on the lower side of the heating chamber 4 is also located at the center on the left and right in the same manner. is there. The magnetron 2 is provided in the space on the back side of the heating chamber 4 of each of the waveguides 5. 1 to the left and right of the upper magnetron 2
A cooling fan 1 is provided for each stage, and the upper and lower magnetrons are cooled by connecting the magnetron 2 and the cooling fan 1 with an upper air guide 8 and a lower air guide 9 by blowing air from the cooling fan 1. The exhaust from the magnetron 2 is
The magnetron 2 is exhausted through an exhaust hole 7 provided on the rear side cabinet surface facing and close to the exhaust opening, and the exhaust opening of the magnetron 2 and the opening are closely contacted with the rear side cabinet. (This is a factor that makes it possible to reduce the size of the high-frequency heating device main body, and a short exhaust passage reduces exhaust resistance, which improves the cooling effect of the high-frequency heating device.) Since the cooling fans 1 provided on the left and right sides are provided on the upper side of the high-frequency heating device, there is a space on the left and right sides of the magnetron 2 on the lower side of the cooling fan, and heavy high-voltage transformers 3 and 2 can be placed on each side. The magnetron 2, cooling fan 1, and high-voltage transformer 3 are all housed in the space on the back side of the heating chamber 4. As described above, the output is high, the heating distribution is good, and the high-frequency heating apparatus main body is downsized due to high-density mounting of parts, which contributes to low cost and further space saving of the installation place. Further, regarding the single-use cooling fan shown in FIGS. 5 and 6 which is a problem in the description of the conventional configuration, the cooling fan is divided into one corresponding to the upper and lower magnetrons 2 as described above. Although two fans 1 are used, the motor of the cooling fan 1 is the same as the one described in the conventional configuration.
Since it is smaller than the motor type, a general-purpose motor can be used, and the cooling fan can be made smaller, so that it can fit well in the rear space of the heating chamber 4.
Further, it becomes possible to use an inexpensive motor due to the effect of mass production. Regarding the heat resistance requirements and contamination of the fan blades of the cooling fan and its fan casing, first of all, regarding heat resistance, since the cooling fan 1 blows toward the magnetron 2, it is not necessary to use heat resistant ones. I am using a resin molded product. Regarding dirt, before cooling the magnetron 2 with the wind from the cooling fan 1, part of the air to the magnetron 2 is opened in the heating chamber 4 at the upper air guide 8 or the lower air guide 9. When opened, it branches into the heating chamber. The exhaust air from the heating chamber 4 that has flowed into the heating chamber is exhausted outside the cabinet of the high-frequency heating device by opening an exhaust opening 14 for exhausting the heating chamber 4 and providing an exhaust guide at that location. The fan blades and the fan casing of the cooling fan 1 are not contaminated by the steam and gas in the heating chamber.

Effects of the Invention As described above, according to the high frequency heating device of the present invention, the following effects can be obtained.

(1) Since the two magnetrons, the cooling fans, and the high-voltage transformers are housed in a space in which the parts on the rear side of the heating chamber are housed, in a state that they are almost one lump, the high-frequency heating device can be compactly designed for compression.

(2) Considering the mass production effect of the motor because the cooling fan can be used with a general-purpose motor, it is possible to pursue the cost reduction together with the size reduction.

(3) Since the cooling fan does not suck the vapor and gas in the heating chamber, the fan blades of the cooling fan,
Don't worry about the dirt on the fan case.

(4) Since the high-voltage transformer is arranged at a low position in the high-frequency heating device, the fixing method is easy and the high-voltage transformer can be cooled effectively.

(5) The power supply to the two heating chambers is from the top and the bottom, which are structurally optimal positional relationships for the heat distribution, and the left and right directions of these power supply positions are substantially in the center, so that the heat distribution is good. .

(6) Since the magnetron, cooling fan, and high-voltage transformer are placed behind the heating chamber, it is possible to reduce the protrusion in the vertical and horizontal directions due to such parts of the external shape of the front part of the main body of the high-frequency heating device.
As a result, the installation frontage of the high-frequency heating device can be small, so that the installation space can be saved.

(7) Since the exhaust opening of the magnetron is located close to the exhaust hole of the magnetron provided in the cabinet on the rear side of the main body, the exhaust heat of the magnetron is exhausted almost directly to the outside of the main body, and the magnetron, cooling fan, high pressure transformer Are concentrated in the rear of the heating chamber and are close to the exhaust opening of the main body, so that the main body can be cooled efficiently.
As a result, high-density mounting of main body parts becomes possible and the main body can be downsized.

(8) Since the cooling fan is located above the rear of the heating chamber, it can efficiently absorb the heat generated by the magnetron and the high-voltage transformer, so that the parts are cooled well, which enables high-density mounting of the main parts. .

[Brief description of drawings]

1 is an internal top view of a high-frequency heating apparatus showing an embodiment of the present invention, FIG. 2 is a rear view of the same, and FIG. 3 is an internal top view of a conventional high-frequency heating apparatus. FIG. 5 is an internal rear view of the same, FIG. 5 is an internal top view of another conventional example, and FIG. 6 is an internal rear view of the same. 1 ... Cooling fan, 2 ... Magnetron, 3 ... High-voltage transformer, 4 ... Heating chamber, 5 ... Waveguide, 8 ... Upper air guide, 9 ... Lower air guide.

Claims (1)

[Claims] 1. A magnetron, comprising two magnetrons, a high-voltage transformer for the magnetron corresponding to the magnetrons, and a cooling fan, wherein the magnetrons are arranged one behind the heating chamber and one above and below the center of the heating chamber. A high frequency power is supplied from the magnetron to the upper and lower surfaces of the heating chamber by a waveguide, and cooling of the magnetron is performed on each of the magnetrons through an air guide by cooling fans arranged on the upper and lower sides of the heating chamber. The air after cooling the magnetron is discharged from the exhaust holes provided in the cabinet on the rear side of the main body near the exhaust opening of the magnetron, and the power supply to the magnetron is distributed under the cooling fan. A high-frequency heating device that uses the above high-voltage transformer.