JPS6244978A - High frequency heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an improvement in a vertical high-frequency heating device in which an operating section is disposed above or below an opening/closing door disposed on the front side of the device body.

[Technical backlash of the invention and its problems]

2. Description of the Related Art Generally, a vertical type high-frequency heating device such as a microwave oven has been developed in which an operating section is disposed above or below an opening and closing eye disposed on the front surface of the device body. In this case, a machine room is formed above or below a heating chamber arranged inside the main body of the device, and a magnetron (i.e.
An i-frequency oscillator) and a high-voltage transformer are respectively provided, and a cooling fan is installed to cool these magnetrons and high-voltage transformer. When the magnetron is operating, the cooling fan is driven to rotate, and as the cooling fan is driven, outside air is drawn into the machine room from outside the equipment body, and cooling air from the cooling fan is blown onto the magnetron and the high-pressure transformer. Electrical components such as the magnetron and high-voltage transformer are cooled.

By the way, in this type of equipment, there is a limit to the height of the machine room, and the fan diameter of each cooling fan is limited according to the height of the machine room. It was not possible to use a large cooling fan with a large fan diameter, which caused problems in improving the cooling effect. Furthermore, since it is difficult to arrange the magnetron and the high voltage transformer close to each other in the limited internal space of the machine room, the magnetron and the high voltage transformer are arranged at separate positions. Therefore, since a single cooling fan cannot effectively cool down the magnetron and high voltage transformer, which generate heat at high temperatures, a pair of cooling fans is installed in the machine room, and the magnetron and high voltage transformer are each separated by separate cooling fans. I was trying to cool it down.

However, in the case of the conventional structure, there is a possibility that the height dimension of the machine room may vary for each manufactured product due to manufacturing errors or assembly errors of each component of the apparatus body. Therefore, a relatively large dead space is created between the tip of each cooling fan and each inner wall of the machine room in order to prevent the cooling fans from coming into contact with the wall of the machine room when the cooling fans are rotated. Therefore, there was a problem in that the ratio of the outer diameter of each cooling fan to the height of the machine room could not be made very high. Therefore, since the outer diameter of each cooling fan was relatively small, there was a problem in increasing the cooling effect of each electrical component.

In addition, due to manufacturing errors or assembly errors of each component of the device main body, after each cooling fan is installed, the distance between the tip of each cooling fan and the top surface of the machine room, and the distance between the tip of each cooling fan and the machine There was also the problem that it was difficult to maintain the same distance from the bottom surface of the chamber. If each cooling fan is driven in such a state that the distance between the tip of each cooling fan and the top surface of the machine room does not match the distance between the tip of each cooling fan and the bottom surface of the machine room. In this case, the flow of cooling air in the machine room was likely to become unstable, which could result in increased noise. Therefore, after installing each cooling fan, the distance between the tip of each cooling fan and the top surface of the machine room,
Since fine adjustment work was required to match the distance between the tip of each cooling fan and the lower surface of the machine room, there was a problem in that the assembly work was troublesome.

[Purpose of the invention]

This invention makes it possible to set the ratio of the outer diameter of each cooling fan to the height of the machine room sufficiently, increasing the cooling effect of each electrical component, reducing noise, and facilitating assembly work. The purpose of this invention is to provide a high-frequency heating device that can achieve

[Summary of the invention]

In this invention, a machine room is formed above or below a heating chamber arranged inside a device main body, and a high frequency oscillator and a high voltage transformer are respectively arranged in this machine room.
In a high-frequency heating device equipped with a pair of cooling fans that cool these high-frequency oscillators and high-voltage transformers, one end is attached to the edge of the rear plate of the heating chamber facing the machine room side, and the other is attached to the edge of the rear plate of the heating chamber facing the machine room side. A heating chamber support member whose end portion is attached to the bottom plate or top plate of the apparatus main body forming the machine room to maintain a constant height dimension of the machine room is provided, and the cooling fan is attached to the heating chamber support member. It is characterized by the fact that it has been installed.

[Embodiments of the invention]

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

FIG. 1 shows the external appearance of a high-frequency heating device such as a microwave oven, and 1 is the main body of the device.

An opening/closing mechanism n2 is provided on the front surface of the apparatus main body 1, and an operation panel 3 is provided below this opening/closing section 112.

Furthermore, a heating chamber 4 is disposed inside the apparatus main body 1 as shown in FIG. Inside this heating chamber 4 there is an upper heater 5. Lower heaters 6 are provided at the bottom.

Furthermore, the lower part of the heating chamber 4, that is, the bottom plate 4a of the heating chamber 4
A machine room 7 is formed in the space between the bottom plate 1a of the main body 1 and the bottom plate 1a of the main body 1. Inside this machine room 7, as shown in FIGS. 3 and 4, a magnetron (high frequency oscillator) 8. Electrical components such as a high voltage transformer 9 and a pair of (first and second) cooling fans 10 and 11 are installed. In this case, the magnetron 8 is located approximately in the center of the machine room 7 in the front and back direction.
It is disposed near the left side plate 1b of the apparatus main body 1 forming the machine room 7 in FIGS. 3 and 4. Furthermore, the high voltage transformer 9 is located approximately in the center of the machine room 7 in the front and back direction.
It is disposed near the right side plate 1C of the apparatus main body 1 forming the machine room 7 in FIGS. 3 and 4. Also,
The magnetron 8 is attached to the lower end of a waveguide 12 attached to the left side plate 4b of the heating chamber 4. The high frequency wave output from the magnetron 8 is guided upward through the waveguide 12 and introduced into the heating chamber 4 through an excitation port for introducing high frequency waves formed on the left side plate 4b of the heating chamber 4. It has become.

Further, the first cooling fan 10 is disposed behind the high pressure 1 to the lance 9 in a spaced-apart manner, and the second cooling fan 11 is disposed behind the magnetron 8 in a spaced-apart manner. Furthermore, the first cooling fan 10 is directly connected to the rotating shaft 13a of the fan motor 130. This fan motor 13 is attached to a heating chamber support member 14, and the fan motor attachment is attached to a plate 15. Also,
The second cooling fan 11 is attached to the rotating shaft 16.

This rotating shaft 16 is rotatably supported by a heating chamber support member 14 and bearings 18a and 18b mounted on a plate 17, respectively. Furthermore, the fan motor 130 rotation shaft 1
A first pulley 19 is fitted to 3a, and
A second pulley 2'O is fitted onto the rotating shaft 16.

And these first pulley 19 and second pulley 20
An endless belt 21 is stretched between the fan motor 13 and the first cooling fan 10 which is directly rotated as the fan motor 13 is driven. The second cooling fan 11 is rotated by being transmitted to the rotating shaft 16.

Further, the heating chamber support member 14 is a member formed in a substantially rectangular frame shape, and the outer peripheral edge of the heating chamber support member 14 includes an upper bent portion 14a bent toward the front, and a lower bent portion 14.
b and both side bent portions 14C114d are formed, respectively, and have an abbreviated cross-sectional shape. The lower bent portion 14b of the heating chamber support member 14 is bonded and fixed to the bottom plate 1a of the apparatus main body 1 forming the machine chamber 7. Further, the upper bent portion 14a of the heating chamber support member 14 has a hook portion 14e formed on the tip side thereof, and an extension portion 14f extending upward. Then, the joint end 14d of the bottom plate 4a of the heating chamber 4 and the rear plate 4G is engaged between the portion 14e and the extending portion 14f, and in this state, the extending portion 14f is connected to the bottom plate of the heating chamber 4. 4a and the rear plate 4G, and between the bottom plate 1a of the apparatus main body 1 and the bottom plate 4a of the heating chamber 4, which form the machine chamber 7 by this heating chamber support member 14. Distance〈Machine room 7
The height dimension) h of the machine room 7 is regulated so that the height dimension of the machine room 7 is kept constant. Further, the fan motor is attached to the heating chamber support member 14 through a plate 15 and the rotating shaft is attached via a plate 17. The first fan between each second cooling fan 10.11 and the bottom plate 4a of the heating chamber 4
The separation distance a and the first . Each second cooling fan 10°1
1 and the bottom plate 1a of the device main body 1 forming the machine room 7. Both second cooling fans 10 and 11 are installed so that the blowing directions of cooling air are substantially parallel to each other.

Also, 1st. The second cooling fan 10.11 is made of a slightly flexible synthetic resin material, such as polypropylene. And the first of these. The second cooling fan 10.11 has a fan motor 13, a rotating shaft 16, and a rotating shaft attached to the heating chamber support member 14.
The bearings 18a, 18b and other parts mounted on the bearings 18a and 18b are located away from the position facing the lower heater 6 in the heating chamber 4, so that they are not easily affected by the heat of the lower heater 6 when heating the heaters. ing.

Furthermore, a louver-shaped ventilation hole 22 is formed in the rear plate 1d of the apparatus main body 1, and a first vent hole 22 is formed in the bottom plate 1a of the apparatus main body 1. Second cooling fan 10°11
A louver-shaped vent hole 23 is formed on the front side. Further, in the left side plate 4b of the heating chamber 4, a punching hole 24 for introducing air is formed in front of the excitation port for introducing high frequency waves. Then, the first and second cooling fans 10.11
As the device is driven, outside air is sucked into the machine room 7 through the vent 22 of the rear plate 1d of the main body 1, and the cold air blown out from the first cooling fan 10 is drawn into the machine room 7. Wind is blown to the high voltage transformer 9, and cooling air blown from the second cooling fan 11 is blown to the magtron 8, respectively. Further, the cooling air that has cooled the high voltage transformer 9 is discharged to the outside from a vent 23 in front of the high voltage transformer 9. In addition, a part of the cooling air that has cooled the magnetron 8 flows upward along the left side plate 4b of the heating chamber 4, and is introduced into the heating chamber 4 through the punched hole 24 in the left side plate 4b of the heating chamber 4. 4 is used for ventilation, and the remainder is discharged to the outside from the front vent 23.

Note that a rotary plate 25 is installed in the heating chamber 4 as shown in FIG. This rotary plate 25 is the bottom plate 4a of the heating chamber 4.
The rotary disk 26 is rotatably supported approximately at the center of the rotary disk 26 . Furthermore, this rotary disk 26 is connected to the drive motor 2.
It is connected to 7.

The rotary plate 25 is rotationally driven by the drive motor 27 via the rotary disk 26.

Therefore, in the above structure, the lower bent portion 14b of the heating chamber support member 14 is bonded and fixed to the bottom plate 1a of the apparatus main body 1 forming the machine chamber 7, and the heating chamber support member 14
The upper bent portion 14a is hooked between the portion 148 and the extension portion 14f at the joint end 14 between the bottom plate 4a and the rear plate 4C of the heating chamber 4.
d, and in this state, screw the extending portion 14f into the joint end 14d between the bottom plate 4a and the rear plate 4C of the heating chamber 4 with one screw. 7
The distance (height dimension of the machine room 7) h between the bottom plate 1a of the device main body 1 and the bottom plate 4a of the heating chamber 4, which form the
Since the height dimension of the machine room 7 is kept constant, the height dimension of the machine room 1 can be changed for each product after manufacturing due to manufacturing errors or assembly errors of each component of the device main body 1. It is possible to prevent variations from occurring. Therefore, as in the past, the first Second cooling fan 10.1
These 1st. Second cooling fan 10
．． 11 from coming into contact with the wall surface of the machine room 7. Between the tip of the second cooling fan 10.11 and the bottom plate 4a of the heating chamber 4 and between each of the first and second cooling fans 1
0.11 and the bottom plate 1a of the main body 1 forming the machine room 7, there is no need to provide a large dead space between the 1st. Each second cooling fan 10
．． The ratio of the outer diameter dimension of No. 11 can be made higher than that in the past. Therefore, the first. each second cooling fan 10;
．． 11 can be made relatively large, and the cooling effect of each electric component can be enhanced.

In addition, it is possible to prevent variations in the height of the machine chamber 1 for each manufactured product due to manufacturing errors or assembly errors of each of the five component parts of the device main body 1. The fan motor is attached to the support member 14 through a plate 15 and the rotating shaft is attached via a plate 17. The first separation distance 1lila between each second cooling fan 10.11 and the bottom plate 4a of the heating chamber 4; The second separation distance between each of the second cooling fans 10.11 and the bottom plate 1a of the apparatus main body 1 forming the machine room 7 is maintained substantially the same. The work of assembling each of the second cooling fans 10 and 11 can be carried out. Therefore, it is possible to prevent the flow of cooling air in the machine room 7 from becoming unstable and to reduce noise. Each second cooling fan 10. 1st after installing '11. The installation of each of the second cooling fans 10, 11 can eliminate the troublesome work of finely adjusting the position, and the assembly work can be facilitated.

Further, the lower bent portion 14b is bonded and fixed to the bottom plate 1a of the device main body 1 forming the machine room 7, and the upper bent portion 1
4a is the joint end 14 between the bottom plate 4a and the rear plate 4C of the heating chamber 4.
d by the heating chamber support member 14 screwed to the first. Since the second cooling fans 10 and 11 are supported, the first and second cooling fans 10 and 11 are supported. Increase the support strength of each second cooling fan 10.11,
The generation of vibration can be suppressed.

Also, 1st. The second cooling fan 10.11 is mounted on a fan motor 13, a rotating shaft 16, and a rotating shaft mounted on a heating chamber support member 14.
The lower heater 6 in the heating chamber 4 along with parts 8a, 18b, etc.
The rotary shaft 16 and the bearings 18a, 1 are arranged at a position away from the position facing the lower heater 6, so that these parts are not easily affected by the heat of the lower heater 6 when the heater is heated.
It is possible to prevent thermal deformation of sliding parts such as 8b, etc., and
．． The rotation of the second cooling fan 10.11 can be stabilized. Furthermore, the first method is achieved without using any special heat insulating material. Each component such as the second cooling fan 10.degree. 11 can be formed, for example, the first and second cooling fans 10.
The bearings 11 can be made of a slightly flexible synthetic resin material such as polypropylene to reduce noise, and the bearings 18a and 18b can also be made of a synthetic resin material to reduce costs.

Note that this invention is not limited to the above embodiments. For example, in the above embodiment, the machine chamber 7 is formed below the heating chamber 4 disposed inside the device main body 1, but the machine chamber 7 may be formed above the heating chamber 4. Good too. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

According to this invention, one end is attached to the edge of the rear plate of the heating chamber facing the machine room side, and the other end is attached to the bottom plate or top plate of the device main body forming the machine room. A heating chamber support member that maintains a constant height of the chamber is provided, and a cooling fan is attached to this heating chamber support member, so that the ratio of the outer diameter of each cooling fan to the height of the machine room is sufficiently high. (It is possible to reduce the cold W effect on each electrical component, reduce noise, and facilitate assembly work.)

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view showing the external appearance of the microwave oven, FIG. 2 is a sectional view taken along line U-4 in FIG. 1, and FIG. 4 is a sectional view taken along the line TV--IV in FIG. 3. 1... Device main body, 4... Heating chamber, 7... Machine room,
8... Magnetron (high frequency oscillator), 9... High voltage transformer, 10... First cooling fan, 11... Second cooling fan, 14... Heating chamber support member, h...
Machine room height dimensions.

Claims (1)

[Claims] A machine room is formed above or below the heating chamber arranged inside the device main body, and a high frequency oscillator and a high voltage transformer are respectively arranged in this machine room, and these high frequency oscillators and high voltage transformer are respectively cooled. In a high-frequency heating device equipped with a pair of cooling fans, one end is attached to an edge of a rear plate of the heating chamber facing the machine room, and the other end forms the machine room. A high-frequency heating device characterized in that a heating chamber support member is provided that is attached to a bottom plate or a top plate of the machine room to maintain a constant height dimension of the machine chamber, and the cooling fan is attached to the heating chamber support member.