JPH0322650Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a temperature control device for a cooking device such as an electric oven.

(Prior art) Conventionally, for example, in an electric oven, a thermostat was attached to the inner case via a heat transfer plate, and a temperature control dial was directly inserted into this thermostat. Temperature control accuracy is poor because it is not installed in the Additionally, the heat from the thermostat is transferred directly to the temperature control dial, which can cause the dial to become hot, change in temperature, or change color, making it look unsightly. Furthermore, when attaching the temperature control dial to the thermostat, unreasonable force is likely to be applied, and the position of the temperature control dial depends on the mounting position of the thermostat, resulting in less flexibility. Furthermore, since the thermostat is located far from the inner case of the oven, temperature sensing is inaccurate.

By the way, focusing on the above-mentioned problems, a temperature control device for a heating cooker has been developed in which the thermostat installed on the heating chamber wall of the oven inner case can be remotely controlled from the operation panel at the front of the oven. 55−
It is known from Publication No. 124737. This temperature control device for a heating cooker is provided with a thermostat for controlling the energization of the heating means on the outside of the inner case that is in contact with the air of the heating cooker, and a temperature adjustment knob is provided on the operation panel of the heating cooker. A temperature setting numerical scale is provided around the temperature adjustment knob on the operation panel,
Furthermore, a remote control mechanism is provided between the thermostat and the temperature adjustment knob to transmit the operation amount of the temperature adjustment knob to the thermostat, and the temperature adjustment knob can be rotated to a desired temperature setting numerical scale. When the thermostat is operated to set the desired temperature, the thermostat is set to the desired temperature in conjunction with the temperature adjustment knob.

(Problems to be Solved by the Invention) In the above-mentioned prior art, when a desired temperature is set by rotating the temperature adjustment knob, it is necessary to visually check not only the area around the desired temperature setting number scale but also the entire temperature setting number scale. There is a problem in that visibility and operability are poor because the temperature adjustment knob must be operated by the user. Furthermore, in the prior art, the thermostat senses the temperature outside the inner case, so it has poor thermal response and cannot perform accurate temperature control.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a temperature control device for a cooking device that improves the operability of temperature setting and has excellent thermal responsiveness.

[Structure of the invention] (Means for solving the problem) The present invention has a display window 11 at the lower front of the outer case 1.
The display window 1 is provided with an operation unit mounting plate 7 formed with a
1 represents a part of the peripheral surface 13a, and the axis X
is provided horizontally, and a temperature adjustment dial 13 having a display drum part 12 having temperature setting display parts 12b and 12c on the circumferential surface 13a is rotatably provided, and the inner case 2 constituting the heating cooking chamber 3 Side plate 2
An operating roller 14 is provided on the outside of the temperature control dial 13 and is coaxial with the axis X of the temperature control dial 13, and is provided in the heating cooking chamber 3 on the outside near the upper part of the side plate 2a. Heater 4, 5
A thermostat 8 is provided, and a heat-sensitive element 9 of the thermostat 8 is provided inside the heating cooking chamber 3, and is connected to the thermostat 8 via a variable temperature setting shaft 10c, and is connected to the outside of the side plate 2a. A driven roller 19 is provided with the axis Y being horizontal, and the actuating roller 14 is
and the driven roller 19.
A connecting body 20 is wound around the body to transmit the movement of the temperature to the variable temperature setting shaft 10c of the thermostat 8.

(Function) With the above configuration, when the temperature adjustment dial 13 appearing in the display window 11 is rotated, a part of the circumferential surface 13a on which the temperature setting display sections 12b and 12c are provided in the display window 11 becomes the temperature adjustment dial. Appears in response to the rotation of 13. The thermostat 8 is set to a predetermined temperature in conjunction with the temperature control dial 13, and the temperature in the heating cooking chamber 3 is sensed by the heat-sensitive element 9 of the thermostat 8, and the heater 4, 5 can be controlled.

(Example) The following is an example of the present invention shown in Figures 1 to 8.
This will be explained with reference to the figures.

1 and 4 show an electric oven, an outer case 1 of this electric oven is provided at a distance outside an inner case 2, a heating cooking chamber 3 is formed inside the inner case 2, and the inner case An upper heater 4 and a lower heater 5 are attached to the upper and lower portions of the heater 2 by, for example, sheathed heaters. The ends 4a and 5a of the upper heater 4 and the lower heater 5 are respectively provided to protrude outside the inner case 2. An opening/closing door 6 that covers the front opening of the heating cooking chamber 3 is attached to the front of the outer case 1 so as to be openable and closable, and a glass 6a is attached to the center of the opening/closing door 6. An operating unit mounting plate 7 is installed horizontally at the lower front of the outer case 1. Inner case 2
Thermostat 8 attached to the back of the side plate 2a of
is an interlocking type of metal expansion type, for example, a stainless steel pipe with a large coefficient of linear expansion and amber with a small coefficient of linear expansion are formed integrally with metals with different coefficients of linear expansion, and the expansion difference between the two is compensated for. It consists of a cylindrical heat-sensitive element part 9 having a transmitting operating piece 9a, and a switch part 10 provided at the base of the heat-sensitive element part 9 and having a quick-acting contact mechanism operated by the heat-sensitive element part 9. , the switch part 10 has a fixed contact 10a and a movable contact 10b, and the fixed contact 10a and the movable contact 10b.
It consists of a fixed piece 10e and a folded movable piece 10f, respectively, and a plate spring 10g that presses the movable piece 10f.By opening and closing the switch part 10, the power to the upper heater 4 and the lower heater 5 is turned on.・It is set to turn off. Then, a variable temperature setting shaft 10c having a male threaded portion 10d is brought into contact with the outside of the movable piece 10f. This variable temperature setting shaft 10c is screwed onto the mounting plate 8a of the thermostat 8. The thermostat 8 is attached to the inward convex wall 2b formed on the side plate 2a of the inner case 2 via the mounting plate 8a, and the heat-sensitive element 9 of the thermostat 8 is inserted into the heating cooking chamber from the convex wall 2b. It protrudes to the back of 3.

A display window 11 is formed on one side of the operation unit mounting plate 7, and a cooking name setting display section 12b such as "yogurt" serving as a temperature setting display section and a temperature setting numerical scale display section 12c are displayed on the peripheral surface 13a. A part of the temperature control dial 13 having the drum portion 12 is exposed through the display window 11 of the operation unit mounting plate 7, and is projected from the operation panel 7a, so that it can be rotated and operated horizontally from the outside. This temperature control dial 13 is made of plastic, and the axis X is provided horizontally, and the temperature control dial 13 is
The central part of the actuating roller 14, which is coaxially connected to one side via an actuating shaft (not shown), is attached to the operating unit mounting plate 7.
The display drum section 12 is inserted into the center of a bearing plate 16a fixed to one side of the bending surface 7b with a screw 15, and mounted on the shaft. By pivoting the side plate 12a, the temperature control dial 13 and the display drum part 12 are installed.
is rotatably provided.

An automatic changeover switch 17 for the lower heater 4 is formed with an operating protrusion 14a inside the bearing plate 16a of the operating roller 14, and is opened and closed by bringing an operating piece 17a into contact with the operating protrusion 14a by rotating the temperature control dial 13. is attached to the bearing plate 16a. This automatic changeover switch 17 is the temperature control dial 13.
When the temperature is set at approximately 38°C, which is the optimum temperature for fermentation of yeast or yogurt bacteria, the fermentation takes place. In addition, the operating protrusion 1 of the operating roller 14
A locking protrusion 14b is formed near the switch 4a, and the actuation protrusion 14a is connected to the automatic changeover switch 17.
A stopper 18 is provided on the bearing plate 16a to prevent rotation of the operating roller 14 in the direction of the arrow when it comes into contact with the bearing plate 16a.

Then, the operating roller 14 and the variable temperature setting shaft 10
A thin and flexible plate belt 20 made of stainless steel or the like is wound between the driven rollers 19 constituting the temperature setting section fixed to the end of the roller c. The driven roller 19 provided on the side plate 2a to which the actuating roller 14 is attached has its axis Y horizontally, and its diameter d is smaller than the diameter D of the actuating roller 14.

Further, the first guide pulley 22 of the plate belt 20 is provided near the actuating roller 14 at a position forward of the straight line O-O connecting the rotation center of the actuating roller 14 and the rotation center of the driven roller 19. The wrapping range A of the actuating roller 14 is made larger than 180°. Similarly, the second guide pulley 21 is provided near the driven roller 19 so that the wrapping range B of the driven roller 19 is 180 degrees or more. Then, the plate belt 20 is connected to the operating roller 14.
The lower part is fixed with a screw 23. At this fixed point, the rotational position of the temperature control dial 13 is at the maximum a,
Even when the minimum value b is within the winding range A, the upper part of the plate belt 20 and the fixing screw 24 of the driven roller 19 are within the winding range B, with a maximum a' and a minimum b'.

A belt spring 2, which is an elastic body, is attached to the plate belt 20 approximately in the middle between the operating roller 14 and the driven roller 19.
5 is provided, and the belt spring 25 is configured to apply tension to the plate belt 20. This belt spring 25 is attached to the mounting base end 2
5a, a spring plate 25b extending along the longitudinal direction of the plate belt 20, and this spring plate 25b.
It consists of a front contact surface portion 25c connected to the front end of the plate belt 20 and a rear contact surface portion 25d provided at a distance from the front contact surface portion 25c to the rear rear surface of the plate belt 20. An arc-shaped introduction plate portion 25e is connected to the lower part of the front contact surface portion 25c, and a restraining piece 25f is provided at a distance behind the rear contact surface portion 25d.

The first guide pulley 22 has a bearing plate 16a at its lower end.
The second guide pulley 21 is attached to the lower part 16b of the mounting plate which is connected to the upper part 16c of the mounting plate. On the other hand, the mounting plate 8a of the thermostat 8 is
It is attached to the mounting seat 16d provided at the upper end of the holder 6c.
The lower mounting plate 16b and the upper mounting plate 16c are integrated by welding or the like to form a thick mounting plate 16, which is attached to the side plate 2a. Further, a protective wall 26 is erected on the mounting plate 16 to surround the plate belt 20 so that its movement is not obstructed by an electric cord (not shown) or the like. A timer 27, a manual changeover switch 28 for the lower heater 5, and a power indicator lamp 29 are mounted on the operation unit mounting plate 7. FIG. 7 is an electrical circuit diagram in which a timer 27, thermostat 8, and upper heater 4 are connected in series to a commercial AC power source 30 to form a closed circuit, and an automatic changeover switch 1 is connected to the upper heater 4.
7, the manual changeover switch 28, and the lower heater 5 are connected in parallel, and a resistor 2 is connected to the commercial AC power source 30.
Power indicator lamps 29 are connected in parallel via 9a.

Therefore, when cooking gratin, cake, etc. at a high temperature, first close the manual changeover switch 28, then rotate the temperature control dial 13 to set the desired temperature, for example, 250°C or 160°C in the display window 11. Set so that the temperature setting numerical scale display section 12c such as °C appears. By operating this temperature control dial 13, the plate belt 20 also moves to the first and second guide rollers 2.
2 and 21, and the driven roller 19 rotates. By this rotation, the temperature setting variable shaft 10
c is retracted outward by the male screw portion 10d, and the pressing force of the leaf spring 10g on the movable piece 10f becomes smaller.

Next, the timer 27 is set for a desired time, e.g. 10 minutes, 30 minutes.
When set to 1 minute, the power indicator lamp 29 lights up, and when the heating cooking chamber 3 is below the set temperature, the operating piece 9a of the heat-sensitive element section 9 presses the movable piece 10f outward, and the fixed contact 10a and the movable contact 10b are connected. Then, the upper heater 4 and the lower heater 5 are energized to heat the cooking chamber 3. When the heating cooking chamber 3 reaches a set temperature or higher, the heat sensitive element section 9 provided inside the heating cooking chamber 3 senses the temperature, and the fixed contact 10a and the movable contact 10b are separated by the heat sensitive element section 9. Then, the upper heater 4 and the lower heater 5 are repeatedly supplied with and stopped, and the set temperature is maintained until the set time of the timer 27. At this time, the automatic changeover switch 17 is in the closed state.

In addition, when attempting to heat a pie or the like at a relatively high temperature for a short time in cooking such as lightly browning, open the manual selector switch 28, rotate the temperature control dial 13, and use the display window, for example. Set the temperature so that the 250°C temperature setting numerical scale display section 12c appears at 11, and turn on the timer 27.
When set to about 3 minutes, the temperature is controlled by the thermostat 8 and power is supplied only to the upper heater 4, heating the cooking chamber 3 to a predetermined temperature.

Next, when performing low-temperature heating of about 38°C to ferment yeast or yogurt bacteria for making bread dough, rotate the temperature control dial 13 to display the cooking name of "yogurt" on the display window 11. When the temperature is set to the desired temperature so that the setting display section 12b appears, the locking projection 14b locks with the stopper 18, and the operating projection 14a presses the operating piece 17a, opening the automatic changeover switch 17. At the same time, the plate belt 20 rotates to rotate the driven roller 19 to advance the variable temperature setting shaft 10c, increasing the pressing force of the plate spring 10g on the movable piece 10f, and setting the movable contact 10b at a predetermined position. When the timer 27 is set, for example, to 10 minutes or continuously, the lower heater 5 is cut off by the automatic changeover switch 17 regardless of whether the manual changeover switch 28 is opened or closed, and only the upper heater 4 is turned off by the thermostat 8.
The temperature is controlled by the power source, and power is supplied to the device to heat it as shown by the solid line in FIG. When the set temperature is reached, the actuating piece 9a presses outward against the pressing force of the leaf spring 10g, and the fixed contact 10a and the movable contact 10b
Remove the power, disconnect the power, and maintain the specified temperature. moreover,
When rotating the temperature control dial 13 to rotate the driven roller 19 via the plate belt 20, the plate belt 2
The front contact surface 25c of the belt spring 25 contacts the front surface of the plate belt 20 to apply a predetermined tension, and similarly the rear contact surface 25d contacts the rear rear surface of the plate belt 20 to apply a predetermined tension. .

According to the above embodiment, by disposing the heat-sensitive element part 9 of the thermostat 8 in the heating cooking chamber 3, the heat-sensitive element part 9 can directly touch the heated air in the heating cooking chamber 3 and receive heat, thereby improving the thermal responsiveness. The temperature is extremely good, the rise temperature and ripple are small, and stable temperature control is possible.

Furthermore, a display drum part 12 is provided on the temperature control dial 13 provided so that a part of the peripheral surface 13a appears in the display window 11, and a cooking name setting display part 12b, A temperature setting numeric scale display section 12c is provided, and a desired cooking name setting display section 1 is displayed in the display window 11 in response to a rotational operation of the temperature adjustment dial 13.
2b, by displaying the temperature setting numerical scale display section 12c to enable temperature setting, that is, when performing a desired temperature setting operation, the surroundings of the cooking name setting display section 12b and the temperature setting numerical scale display section 12c corresponding to the setting are displayed. All you have to do is visually check the information, which eliminates mistakes and improves operability.

Further, an operating protrusion 14a is provided on the operating roller 14 of the temperature adjustment dial 13, and an automatic changeover switch 17 is provided in which the actuation protrusion 14a presses against the actuation piece 17a when the temperature is set. By connecting,
When the low temperature is set, the lower heater 5 is cut off regardless of whether the manual changeover switch 28 is opened or closed, and the upper heater 4
It is possible to heat the chisel without any mistakes. As a result, the amount of heat generated during power supply is reduced, and the temperature difference ΔT in the heating cooking chamber 3 can be reduced, and the control characteristics can be improved, as shown by the solid line in FIG. 8. Further, temperature control can be performed with just one thermostat 8, and the structure is simple and can be manufactured at low cost.

Furthermore, by winding the plate belt 20 between the operating roller 14 of the temperature control dial 13 horizontally installed at the lower front of the electric oven and the driven roller 19 attached to the variable temperature setting shaft 10c of the thermostat 8, the operating roller 14 Since the rollers 19 and 19 are connected to each other on the same surface of the side plate 2a, error factors such as bumps can be eliminated, and accurate temperature setting can be performed. It is installed in a position where it can be detected, while the temperature control dial 1
3. The actuating roller 14, the display drum section 12, etc. can be placed in the lower part of the electric oven where they are less affected by heat, increasing the degree of freedom in mounting and preventing thermal deformation and discoloration.
In addition, the belt spring 25 applies a predetermined tension to the plate belt 20, so that the plate belt 20 is prevented from loosening, and the operating roller 1 of the temperature control dial 13 is
4 and the rotation angle of the driven roller 19 can be accurately matched. Further, the belt spring 25 connects the front and rear parts of the plate belt 20 to front and rear contact surfaces 25, respectively.
Since the plate belts 20 are spaced apart by distances c and 25d, there is no contact friction between the plate belts 20 and smooth movement is possible. Furthermore, when suspending the plate belt 20, since the plate belt 20 has enough length, it can be easily assembled, and the temperature control dial 1
The belt spring 25 can absorb the buckling caused by the flexibility of the plate belt 20 at the end of the rotation in step 3, and errors caused by buckling can be prevented. Moreover, by providing the first and second guide pulleys 22 and 21, the wrapping range A of the plate belt 20 around the actuating roller 14 and the wrapping range B of the plate belt 20 around the driven roller 19 can be expanded to 180°C or more, respectively. By increasing the rotation angle of the temperature adjustment dial 13, the temperature scale on the display drum section 12 can be displayed finely, and the rotation angle of the driven roller 19 on the thermostat 8 side can also be increased, so the temperature adjustment range can be widened. Moreover, it can be done in detail. In addition, since the positions of the screws 23 and 24 are set within the maximum a, a' and minimum b, b' of the winding ranges A and B, respectively, no bending force is applied to the plate belt 20, and the plate belt 20 is cut. Problems such as elongation, deformation, changes in settings, and inability to adjust temperature can be eliminated. In addition, the operating roller 14, thermostat 8, driven roller 19, first and second guide pulleys 22, 21 are mounted on an integrated mounting plate 16 that is thicker than the side plate 2a, and this mounting plate 16 is attached to the side plate 2a. By doing so, the distance between the centers of the actuating roller 14 and the driven roller 19, the distance between the center axes of the first and second guide pulleys 22 and 21, and the actuating roller 14
The relative position with respect to etc. is set accurately without deviation. As a result, the positioning of the actuating roller 14 becomes easier, the movement of the plate belt 20 becomes smoother, and the displayed temperature of the display drum section 12 and the set temperature of the thermostat 8 can be easily matched during assembly.
The rotational backlash of the temperature adjustment dial 13 can also be reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, heaters may be provided at three or more locations, and the operating protrusion 14a is made of a magnetic material, and the automatic changeover switch 1
7 may be a proximity switch, which may be a non-contact type, or an automatic changeover switch 17b may be disposed on the driven roller 19 side as shown in FIG. 9A, and the switch may be opened and closed in conjunction with the rotation of the driven roller 19. Furthermore, in place of the belt spring 25, as shown in FIG. 9A, a bellows-shaped elastic portion 20a is formed approximately at the center of the metal plate belt 20 to elastically prevent the temperature adjustment dial 13 from collapsing at the end of its rotation. It may be absorbed by the portion 20a. In addition, a pair of left and right second guide pulleys 2
1a, 21b and first guide pulleys 22a, 22
The plate belt 20 may be regulated by b. Furthermore, as shown in FIG. 9B, the first guide roller 22c
may be arranged in front of the O-O line and in the vicinity above the top connection P-P line of the actuating roller 14 to increase the wrapping range A' of the plate belt 20 with the actuating roller 14. Further, in the embodiment described above, the diameter D of the actuating roller 14 is smaller than the diameter d of the driven roller 19, but it may be the same diameter or the opposite size, and a flexible steel cable may be used instead of the metal plate belt 20. Or a rubber belt may be used. Also, the mounting plate 16 is connected to the upper mounting plate 16c and the lower mounting plate 16.
Various modifications are possible, such as forming a single mounting plate instead of dividing the mounting plate into parts b and b.

[Effects of the invention] As described above, the present invention has an operation part mounting plate which is provided at the lower front of the outer case and forms a display window, and a part of the peripheral surface is exposed in the display window so that the axis is horizontal. A temperature control dial that is rotatably provided and has a display drum section having a temperature setting display section on the circumferential surface, and a temperature control dial that is connected to the temperature control dial on the outside of the side plate of the inner case constituting the heating cooking chamber. an actuating roller provided coaxially with the axis of the temperature control dial; an actuating roller mounted on the outside near the upper part of the side plate; and a heat-sensitive element section provided inside the heating cooking chamber; a thermostat for controlling the heater; a driven roller connected to the thermostat via a variable temperature setting shaft and provided with its shaft center horizontal on the outside of the side plate; and a driven roller wound between the operating roller and the driven roller. Since it consists of a connecting body that transmits the movement of the temperature adjustment dial to the temperature setting variable shaft of the thermostat, the temperature adjustment dial can be rotated while visually checking the desired temperature setting display section that appears on the display window. Since the temperature can be set by simply setting the temperature, there is no misreading and the operability associated with visual confirmation can be improved.Furthermore, since the heat-sensitive element is installed inside the heating cooking chamber, it has excellent thermal response and can perform accurate temperature control. can.

[Brief explanation of the drawing]

Figures 1 to 8 show one embodiment of the present invention. Figure 1 is a perspective view of the entire inner case side, Figure 2 is a side view of the plate belt, and Figure 3 is a view of the operating roller. 4 is an overall perspective view, 5 is a perspective view of the belt spring and its surroundings, 6 is a plan view of the thermostat, 7 is an electrical circuit diagram, and 8 is a graph showing time and temperature. FIGS. 9A and 9B are side views showing another embodiment. DESCRIPTION OF SYMBOLS 1...Outer case, 2...Inner case, 2a...Side plate of inner case, 3...Heating cooking chamber, 4, 5...Heater, 7...Operation unit mounting plate, 8...Thermostat, 9... ...Thermal element part, 10c...Temperature setting variable axis, 11...Display window, 12...Display drum part, 12b...Cooking name setting display part (temperature setting display part), 12c...Temperature setting numerical scale display part (Temperature setting display section), 13...Temperature adjustment dial, 13
a...Surrounding surface, 14...Operating roller, 19...Followed roller, 20...Plate belt (connection body), X, Y...
...axis core.

Claims (1)

[Claims for Utility Model Registration] (1) An operation unit mounting plate provided at the lower front of the outer case and forming a display window, and a part of the peripheral surface of the display window that rotates with its axis horizontal. a temperature control dial provided with a display drum part which is operable and has a temperature setting display part on the circumferential surface; An actuating roller provided coaxially with the axis of the adjustment dial, and a heater mounted on the outer side near the upper part of the side plate and a heat-sensitive element portion provided inside the heating cooking chamber to operate the heater provided in the heating cooking chamber. A thermostat to be controlled; a driven roller connected to the thermostat via a variable temperature setting shaft and provided with its axis horizontally outside the side plate; and a driven roller wound between the actuating roller and the driven roller to adjust the temperature. 1. A temperature control device for a heating cooker, comprising a connecting body that transmits the movement of the control dial to the variable temperature setting shaft of the thermostat. (2) The temperature adjustment device for a heating cooker according to claim 1, wherein the temperature setting display section is a cooking name setting display section. (3) The temperature adjustment device for a heating cooker according to claim 1, wherein the temperature setting display section is a temperature setting numeric scale display section.