JPS6340723Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microwave oven equipped with a weight measuring device, and relates to a mounting structure for the weight detecting device.

A microwave oven equipped with a weight measuring device is designed to detect the weight of food, set appropriate cooking conditions such as heating time, and automatically cook food under these conditions. Improving the measurement accuracy and stability of the weighing device are important factors for the performance of the weighing device.

A microwave oven equipped with a conventional weighing device is the first
3 through 3 will be explained.

In the figure, 1 is the housing case of the microwave oven,
Exterior body 2 and heating chamber 3 formed within this exterior body
It is composed of. The exterior body 2 includes a case A4 that covers the top and sides and a case B that covers the back.
(not shown) and a case c5 that covers the bottom surface, and these are made of metal plates such as iron. The heating chamber 3 has a case e that forms a top surface and side surfaces.
6, a case f7 forming a rear surface, and a case g8 forming a bottom surface, and these are formed of a metal plate made of stainless steel. The heat source that heats the inside of the heating chamber 3 emits radiation from a radio wave emission port (not shown) provided at the center of the top surface of the case e6 via an upper heater 9a and a lower heater 9b consisting of a resistance heater 9 and a guide tube 10. The magnetron 11 is a source of high-frequency radio waves.
Reference numeral 12 denotes a weight detection device that is mounted with a screw 15 in a space 13 formed by case c5 and case g8 and in a recess 14 provided approximately at the center of case c5. The weight is detected by Reference numeral 16 denotes a door that can open and close the front opening 17 of this heating chamber 3, 18 a pair of pivot supports that pivotally support this door at one end, and 19 a plate provided in the heating chamber 3 substantially parallel to the case g8. 20 is a connecting shaft that connects the weight detection device 12 and the food holder 19;
It is inserted into a through hole 21 provided at approximately the center of the case g8 so as to be movable in the vertical direction. 22 is a leg on which the housing 1 is placed.

Next, in FIG. 3, 23 is a keyboard for inputting cooking information such as the type of food, and 24 is an A/D converter for measuring the weight of the food detected by the weight detecting device 12.
A/ that converts and outputs a digital amount according to the weight
A D converter, 25 is a microcomputer that automatically cooks based on these data, 26 is a digital display that notifies the cooking status, etc., 27 is controlled based on a signal from the microcomputer 25, and turns on the resistance heater 9. Relay to turn off, 28
Similarly, numeral 29 is a triax driver which controls the magnetron 11, and numeral 29 is its triax.

The operation of the above configuration will be explained.

During cooking, the temperature inside heating chamber 3 becomes extremely high,
Normally, in this state, new food is added and automatic cooking is repeated. However, the heat in heating chamber 3 is in case e6, case f7, and case g8.
Since these cases are made of stainless steel plates and the case c5 to which these cases are attached is made of iron plate, the heat is quickly transferred to this case c5, and The directly attached weight detection device 12 becomes hot, and as a result, the characteristics and mutual positional relationships of the mechanical parts that make up this weight detection device become erroneous due to the heat, significantly impairing the measurement accuracy of food weight. The drawback was that the cooking quality was poor.

This invention has been made in view of the above-mentioned drawbacks, and provides a microwave oven in which a weight detection device for detecting the weight of food in the heating chamber is protruded out of the microwave oven housing through an opening formed in the housing. It is something.

An embodiment of this invention will be described below with reference to FIGS. 4 to 7.

In the figure, 31 is a microwave oven case;
Exterior body 32 and heating chamber 3 formed inside this exterior body
3. The exterior body 32 is composed of a case a (not shown) that covers the top and sides, a case b (not shown) that covers the back, and a case c34 that covers the bottom, and is made of a metal plate such as iron. ing. The heating chamber 33 has a case e35 forming a top surface and a side surface, and a case f36 forming a rear surface.
and a case g37 forming the bottom surface,
It is formed from a rust-resistant metal plate such as stainless steel. In addition, this case c34 is provided with a rectangular opening 38 as shown in FIG. It is formed by bending it at a substantially right angle, then bending the end portion from the substantially center thereof at a substantially right angle inward to the opening 38, and further bending the end portion at a substantially right angle inward to the housing 31. A heat source for heating the inside of the heating chamber 33 is composed of an upper heater (not shown) and a lower heater 41 including a resistance heater 40, and a magnetron (not shown). Reference numeral 42 indicates a reinforcing plate welded to the lower side of the case g37; 54 indicates a support metal fitting as a first support part, which is welded to this reinforcing plate and has a supporting shaft 57 as detailed in FIG. 7; 43; is a weight detection device that is hung from this support shaft by four hangers 44 as hanging means, and is provided so as to protrude outward from the housing 31 through the inside of the opening 38, and prevents the peripheral wall portion 45 from swinging laterally. A rubber body 46 having an approximately □ cross-section and serving as a regulating member fitted into the protrusion 39 is loosely pressed and held in order to prevent this from occurring. 47 is a dish-shaped food tray provided in the heating chamber 33 substantially parallel to the case g37; 48 is the weight detecting device 4;
3 and the food holder 47, and is inserted into a through hole 49 provided at approximately the center of the case g37 so as to be movable in the vertical direction. 5
0 is a bearing on which the connecting shaft is rotatably mounted around the axis, and 51 is a lid of the weight detecting device to which this bearing is fixed, and has a through hole 52 through which the hanger 44 passes. 53 is a leg on which this housing 31 is placed.

Next, to explain the weight detection device, 54
is welded to the reinforcing plate 42 as shown in FIG.
This supporting metal fitting includes a through hole 56 provided in the leg-shaped portion 55 and a support shaft 57 press-fitted into the through hole. Reference numeral 58 designates four supporting metal fittings as a second supporting portion each having a pair of leg-like portions 61 welded to the inner bottom portion 60 of the box body 59 of the weight detection device;
The leg portion 61 includes a through hole 62 provided in the leg portion 61 and a support shaft 63 press-fitted into the through hole. The weight detection device 43 is connected to the support shaft 57 and the support shaft 63.
They are each hung from four hangers 44 and hung from the casing 31. Reference numeral 64 indicates four pressure members having a pair of leg-like parts 65 welded to the back surface of the lid 51, 66 indicates an inverted V-shaped part provided on the pair of leg-like parts 65, and 67
are four transmission members that transmit the movement from this pressure member 64. Further, 68 is a weight detection section consisting of a semiconductor pressure sensor or the like, which is fixed to the inner bottom section 60. Reference numeral 69 denotes four substantially L-shaped metal fittings welded to predetermined positions of the inner bottom portion 60, and each of which has a through hole 70 provided therein. Reference numeral 71 denotes a lever A which is rotatably attached to one end of the metal fittings with a shaft 72, and 73 is the same lever B, the end 74 of which is opposite to the side of the metal fitting 69 is welded together with the lever A. This is what is provided. Reference numeral 75 denotes a substantially V-shaped notch provided at a predetermined position on the side end of the metal fittings 69 of the levers A and B, and the end surface of this notch is formed in the shape of a knife edge. 7
Reference numeral 6 designates a lever C whose one end is rotatably attached to the other one of the substantially L-shaped metal fittings 69 with a shaft 72. Reference numeral 77 denotes a lever D, which is connected to the levers A and B at predetermined positions by connecting members 78, respectively. Reference numeral 79 denotes a substantially V-shaped notch provided at a predetermined position on the side end of the metal fittings 69 of the levers C and D, and the end face of the notch is formed in the shape of a knife edge. Also, the notches 75, 75, 7 of these lever groups
The four transmission members 67 are attached to the lid 5.
1, the weight of the food on the food tray 47 is added. Reference numeral 80 denotes a spring for stably maintaining the operation of the lever group, one end of which is supported by the upper end of a column 81 whose one end is welded to the inner bottom 60, and the other end of which supports the ends 74 of the levers A and B. It is something that is hung.

To explain the operation in the above configuration, the weight of the food placed on the food tray 47 is transmitted from the connecting shaft 48 to the lid 51, from this lid via a group of levers to the weight detection section 68, and this weight detection section The output from the microcomputer 25 or other electric circuit is used to measure the accurate food weight.

In this embodiment, the weight detection device 43 includes a case e35, a case f36, which form the heating chamber 33,
Since it is connected to the case g37 only by the hanger 44, and the rest is opposed to each other via an air layer, the heat of the heating chamber 33 is difficult to transfer, and the opening 38 is connected to the case g37.
Since it protrudes from the outside of the exterior body 32, the balance between the heat transfer input from the heating chamber 33 etc. and the heat radiation to the outside of the exterior body 32 is stabilized when the temperature of the weight detection device 43 is low. Changes in the characteristics of the detection unit 68 due to temperature changes are small, temperature distortion of the entire device can be kept small, and deformation of the lever group due to temperature is also small. Displacement transmission by the weight of the food from 47 is also performed accurately, so that appropriate cooking conditions can be set at all times.

Also, the weight detection device 43 is installed in case g37.
Because it is suspended by a hanger 44, the heating chamber 33
No matter how much the case g37 is deformed due to internal heat, the weight detection device 43 is not affected by the deformation.

In this example, the material is hung with a hanger, but the material is not limited to this, and for example, a chain may be used.Although both ends are made free, it is not necessary to use a support structure in which the material is hung with one of the ends set as a fixed end. You can.

Therefore, according to this invention, a weight detection device for detecting the weight of the food to be heated in the heating chamber is disposed penetratingly through the bottom opening of the housing, and is suspended from the bottom of the heating chamber, and is further connected to the opening. By inserting a lateral vibration regulating member between the weight detection device, the influence of heat from the heating chamber on the weight detection device is alleviated, and inadvertent lateral vibration is prevented, allowing accurate food weight detection. It is possible to provide a microwave oven that cooks food to just the right degree. The temperature distortion of the entire device can be kept small,
In addition, the deformation of the lever group due to temperature is small, and the displacement due to the weight of the food from the food tray 47 is accurately transmitted to the weight detection unit 68, thereby ensuring proper cooking at all times. Conditions can be set.

As described above, according to this invention, it is possible to reduce the influence of heat in the heating chamber on the weight detection device, prevent lateral vibration, and accurately detect the weight of food. Therefore, it is possible to provide a microwave oven which has great practical effects such as good quality.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional microwave oven; Figure 2 is a perspective view of a conventional microwave oven;
The figure is a sectional view of the main parts, Fig. 3 is a circuit function block diagram of a general microwave oven, Fig. 4 is a side sectional view of the main parts showing a microwave oven according to an embodiment of this invention, and Fig. 5 is its weight. FIG. 6 is an exploded perspective view of the detection device, FIG. 6 is a bottom view thereof, and FIG. 7 is a diagram showing the state in which the detection device is suspended by a hanger. In the figure, 31 is a housing case, 33 is a heating chamber, 38 is an opening, and 43 is a weight detection device.

Claims (1)

[Scope of utility model registration request] A device comprising a casing, a heating chamber provided in the casing, and a weight detection device for detecting the weight of the object to be heated in the heating chamber, and automatically cooking based on a detection signal of the weight detection device, An opening is provided at the bottom of the casing, the weight detection device is disposed penetrating through the opening and is hung on the bottom surface of the heating chamber, and a rolling regulating member is provided between the opening and the weight detection device. A microwave oven characterized by having a.