JPS594127B2 - rice steaming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rice steaming device that steams rice by supplying steam from a steam generator heated by an electric heater to rice stored in a steaming container. In this method, a control temperature sensing element is installed which detects the temperature of a portion of the rice that is representative of the temperature rise and is activated when the temperature reaches a predetermined temperature to reduce the heat generation capacity of the electric heater. To provide a rice steaming device capable of reducing the amount of water supplied to a rice cooker, thereby speeding up the temperature rise of rice, shortening steaming time, and reducing power consumption in general. It is in.

A first embodiment in which the present invention is applied to a rice cake making machine will be described below with reference to FIGS. 1 to 3.

First, the schematic configuration will be explained with reference to FIG.

1 is an outer box with openings on both the top and bottom, and a base plate 2 at the bottom of the box.
is attached, and a tank 3 as a steam generator is attached to this base plate 2.

This tank 3 has a circular container shape with an opening 4 on the top surface, and a flange 5 having a step 5a is provided at the edge of the opening 4 to project outward.

A shaft cylindrical portion 6 is provided on the bottom wall of the tank 3 to project upward, and a kneading shaft 7 is inserted and supported in this shaft cylindrical portion 6 so as to project upwardly and downwardly, and the lower end of the kneading shaft 7 The driven pulley 8 is fitted and fixed.

Reference numeral 9 denotes an electric heater, which is an electrical component attached to the outer bottom wall of the tank 3.

Reference numeral 10 denotes a drive motor 7, which is an electrical component, mounted on the right side of the base plate 2, with its rotating shaft 10a protruding downward,
A driving pulley 11 is fitted and fixed to the projecting end, and a V-belt 12 is stretched between the driving pulley 11 and the driven pulley 8.

Reference numeral 13 denotes an aluminum tub serving as a steaming container whose diameter increases gradually toward the opening on the top surface, and has a number of spout holes 13a formed in its bottom wall, and a mounting leg 14 protruding outward from the outer bottom wall. to be fixed.

Then, insert this tub 13 into the outer box 1 and attach its mounting legs 1.
4 is placed on the stepped portion 5a of the tank 3 via the backing 15, and the tub 13 is removably attached to the opening 4 of the tank 3.3 At this time, the upper end of the kneading shaft 1 is attached to the tub 13. The impeller 16 is attached to the protruding end.
be attached removably.

Reference numeral 17 denotes a plastic lid that forms a part of the outer box 1, which is shaped like a shallow container with an open bottom, and is used to take the tub 13 in and out of the outer box 1. Mouth 17
It has a.

Reference numeral 18 denotes a cover that is integrally formed so as to hang down and protrude from the periphery of the entrance/exit 17a of the lid body 17. This cover has a diameter that gradually becomes smaller toward the bottom, and surrounds the tub 13 as will be described later. do.

A waterproof backing 19 is attached to the lower end of the cover 18 over the entire circumference by adhesive or the like.

By placing the lower end of the lid 17 on the stepped portion 20a of the upper surface opening 200 of the outer box 1, the lid 17
is removably attached to a predetermined position of the upper surface opening 20,
A cover 18 surrounds the tub 13, and a waterproof backing 19 is pressed against the flange 5 of the tank 3.

21 is a thermal switch for control as a temperature sensing element for control;
Reference numeral 2 denotes a temperature-sensitive case as a temperature detection part of the control thermal switch 22, which is made of a metal with good thermal conductivity, such as aluminum, in the shape of a short cylinder with a bottom, and has a flange at its open end. 22a.

The control thermal switch 21 is disposed within the temperature-sensitive case 22 so that its temperature-sensing portion contacts the inner surface of the closed end of the temperature-sensitive case 22.

Furthermore, this temperature-sensitive case 22 is movably inserted into a mounting hole 18a formed in the upper part of the cover 18 from the inside of the outer box 1, and is provided protruding from the flange 22a and the lower surface of the lid 17. A compression coil spring 24 is interposed between the receiver and the piece 23, and the temperature-sensitive case 22 is projected inward from the upper part of the cover 18 with the flange 22a in pressure contact with the surrounding area of the mounting hole 18a.

Therefore, when the tub 13 is positioned inside the cover 18 and its mounting legs 14 are mounted on the stepped portion 5a of the tank 3 via the backing 15, the temperature-sensitive case 22 causes the tub 13 to compress the compression coil spring 24. The closed end of the temperature-sensitive case 22 is pressed against the upper outer wall of the tub 13 by the spring force of the compression coil spring 24.

In addition, 25 is a lid detachably attached to the top opening of the tub 13;
26 is a buzzer attached to the upper part of the outer box 1.

Now, the configuration of the electric circuit will be described according to FIG.

27 (not shown) is a plug connected to an outlet serving as a single-phase AC power source of 00 V, and its both terminals are connected to bus bars 28 and 29, respectively.

30 is a manual selection switch, which has one movable contact piece d and three fixed contact pieces a to C;
Connect the movable contact piece d to the bus bar 28.

The third fixed contact piece C is connected to the bus bar 2 via the drive motor 10.
9, and the second fixed contact piece is connected to the bus bar 29 via the timer motor 31A of the timer 31 and the control thermal switch 21 in series.

Note that the first fixed contact piece a of the selection switch 30 is a rest contact piece.

Here, the control thermal switch 21 is always open, and the detected temperature is a predetermined temperature Ta (for example, 100° C.
), the closing operation is activated.

In addition to the timer motor 31A, the timer 31 includes a switching cam switch 31B, and the switching cam switch 31B has one movable contact piece d and three fixed contact pieces a to C.

The switching cam switch 31B of this timer 31 always closes the contacts (da) (when the timekeeping operation is stopped), and when the timer motor 31A is energized and starts the timekeeping operation, the contact pieces ( switching to close between d and b),
When the timing operation for a predetermined time t3 (for example, 13 minutes) is completed, the contact piece (d-c) is switched to be closed.

Furthermore, the electric heater 9 is composed of a main heater 9a (for example, a heat generating capacity of 100 V and 800 W) and an auxiliary heater 9b (for example, a heat generating capacity of 100 V and 300 W).

The movable contact piece d of the changeover cam switch 31B is connected to the fixed contact piece of the selection switch 30, and the fixed contact pieces a, b, and C of the changeover cam switch 31B are connected to the main heater 9a.
, the bus bar 29 via the auxiliary heater 9b and the buzzer 26.
Connect to.

Next, the operation of this actual case with the above configuration will be explained with reference to FIG. 3. In FIG. 3, the horizontal axis represents time t, and the vertical axis represents temperature T.

Now, when a desired amount (for example, 1.81) of hotbeds 32 are stored in the tub 13, the temperature-sensitive case 22 and therefore the thermal switch 21 move through the outer wall of the tub 13 to the upper part, which is the area where the temperature of the wet rice 32 is representative. It begins to sense the temperature of the surrounding area Y.

In the tank 3, an amount of water (for example, 320 cc) to generate steam for the time required to gelatinize the wet rice 32 is stored in advance.
Supply 3.

Therefore, when the contact piece (d-b) of the selection switch 30 is selectively closed, the contact piece (a-b) of the selection switch 30 and the contact piece (da-a) of the changeover cam switch 31B are closed. The main heater 9a is energized through the main heater 9a and generates heat with a heat generating capacity of 800 W, for example, to heat the water 33 through the tank 3 and generate steam.

Then, the steam generated in this tank 3 is released from the ejection hole 13a.
The wet rice 32 is supplied into the tub 13 through the steamer and steamed.

As a result, the temperature of the wet rice 32 rises, but at this time, the temperature of the part X near the lower end of the impeller 16, which is the part of the wet rice 32 where the temperature rises most easily, rises extremely quickly as shown by the curve LX in Figure 3. However, the temperature rise in the portion Y, which is representative of the temperature rise in the wet rice 32, is slow as shown by the curve LY in FIG.

In this way, when the predetermined time 11 (for example, 4 minutes) has elapsed (time ta), the temperature of the part , the temperature of part Y is lower than this.

Furthermore, when a predetermined time L2 (for example, 11 minutes) has elapsed (time tc), the temperature of part Y also reaches the predetermined temperature Ta, and generally the humidity of part Y, which represents the temperature rise of this wet rice 32, reaches the predetermined temperature. When Ta is reached (time tc)
The predetermined temperature T is maintained for a certain period of time L3 (for example, 13 minutes) from
If the temperature is kept constant at a, the wet rice 32 will be gelatinized and the steaming process will be completed.

When the temperature of the region Y reaches the predetermined temperature Ta, the control thermal switch 21 senses this via the outer wall of the tub 13 and the temperature-sensitive case 22 and closes the selection switch 3.
The timer motor 31A is energized between the contact pieces (d and b) of
-b).

As a result, the contact piece (d-b) of the selection switch 30 is now
) and between the contact piece (d-b) of the changeover cam switch 31B, the auxiliary heater 9b is energized and generates heat with a heat generation capacity of, for example, 300 W, and the water 33 inside is heated and evaporated through the tank 3. become.

Therefore, the heat generation capacity of the electric heater 9 has decreased from 800W to 300W, but at this time, the tank 3
The amount of water 33 inside the wet rice 32 is extremely reduced, and after the temperature of the portion Y, which represents the rise in the temperature of the wet rice 32, reaches the predetermined temperature Ta, the water 33 within the wet rice 32 can be maintained at the predetermined temperature without supplying a large amount of steam to the wet rice 32. Minimum heat generation sufficient to maintain constant temperature Ta (
Even if the heat generation capacity of the electric heater 9 is reduced from 800 W to 300 W, which is less than half, the temperature of the wet rice 32 can be maintained at the predetermined temperature Ta.

In this way, the wet rice 32 is kept for a certain period of time L3 (for example, 13
When steamed (minute), it becomes alpha and steaming ends (time te), and at this point, the timer 31 ends the clock operation for a certain period of time t3, and the changeover cam switch 31B
switch so that the contact piece (d-c) is closed.

As a result, the buzzer 26 is energized and starts to sound via the contacts (d and b'1) of the 1 selection switch 30 and between the contacts (d and c) of the changeover cam switch 31B. When the user knows that the wet rice 32 has finished steaming, he operates the selection switch 30 so that the contact piece (d-C) is closed.

Therefore, the drive motor 10 is energized between the contacts (d and c) of the selection switch 30, and the impeller 16 is energized via the rotating shaft 10a, the drive pulley 11, the belt 12, the driven pulley 8, and the kneading shaft 7. The rice cake is manufactured by rotating and kneading the wet rice 32.

By the way, in FIG. 3, lX and IY indicate the conventional temperature rise curves of portions X and Y.

That is, conventionally, the tank 3 has a predetermined heat generation capacity (for example, 100
Therefore, when the temperature of part Y reaches the predetermined temperature Ta (time ta), tank 3 is heated with an 800W electric heater from beginning to end. This means that steam is generated.

Therefore, as mentioned above, the temperature of the portion Y is set to the predetermined temperature Ta.
Although it is possible to keep the wet rice 32 constant at the predetermined temperature Ta without supplying a large amount of steam into the tub 13 after reaching the temperature Ta, in the past, a large amount of steam was not supplied into the tub 1.
3, steam will be wasted and electricity will be wasted, and furthermore, at time t.
In order to generate a large amount of steam even after dL3J, it is necessary to supply a larger amount of water into the tank 3 in advance than in the actual case.

If a large amount of water is supplied in advance into the tank 3 as in the past, it takes time to heat the large amount of water and generate steam, so that the temperature of the part Time t4 required to reach temperature Ta (time tb)
is longer than the time t1 in this example, and similarly, the time t5 required for the temperature of the region Y to reach the predetermined temperature Ta (time td) is longer than the time t2 in this example.
Even if the time required for the Confucian rice 32 to gelatinize is the same fixed time t3 as in this example, the end point of steaming (time tf) is longer than the end point (time tf) in this example. te) is clearly slower than te).

According to the inventor's experiments, when steaming 1.81 ml of Confucian rice, the main heater 9a of the apparatus of the present invention is 8.
When using a 300W electric heater and an auxiliary heater 9b, and a conventional device using an 800W electric heater, the device of the present invention requires 320cc of water to be supplied to the tank 3, which lasts until the rice is steamed. The power consumption required for this process was 265 W and the required time was 28 minutes, whereas with conventional equipment, the amount of water supplied to the tank 3 was 4-70 cc, and the power consumption required to finish steaming the rice was much lower. The result was that the power was 400W and the required time was 30 minutes.

According to the inventor's experiments, the device of the present invention has an angle of 1°81
When steaming Confucian rice, if a heater of less than 250W is used as the auxiliary heater 9b, in this actual case, it is insufficient to maintain the predetermined temperature Ta of 100°C, resulting in a decrease in water supply and a reduction in steaming. The results showed that effects such as time reduction and power consumption reduction could not be expected.

As described above, according to this embodiment, the main heater 9a (e.g., heat generating capacity 800 W) and the auxiliary heater 9b (e.g. heat generating capacity 1300 W) having a smaller heat generating capacity are installed at the bottom of the tank 3.
) is provided, and when steaming the rice 32 starts, the main heater 9a is energized to heat the water 33 in the tank 3, and the temperature of the portion Y, which is representative of the temperature rise of the rice 32, is increased. When the temperature reaches a predetermined temperature - (for example, 100°C), the control thermal switch 21 is closed and the timer 3 is activated accordingly.
1, the main heater 9a is turned off and the auxiliary heater 9b is energized instead to heat the remaining water 33 in the tank 3, and the timer 31 starts timing a certain period of time t3 (for example, 13 minutes). When the operation is finished, the auxiliary heater 9b is turned off and instead the buzzer 26 is energized to notify the completion of steaming.

Therefore, after the temperature of the part Y of the Confucian rice 320 reaches the predetermined temperature Ta, the heat generation capacity of the electric heater 9 is reduced and only the amount of steam necessary to maintain the predetermined temperature Ta is supplied to the tank 3.
Unlike conventional methods, there is no need to heat a large amount of water to generate a large amount of steam, and as a result, compared to conventional methods, the amount of water supplied to tank 3 can be reduced, and the amount of water that can be heated increases accordingly. The time required from the start to the generation of steam is shortened, the temperature of the steamed rice rises quickly, the steaming time can be shortened, and overall power consumption can be significantly reduced.

Moreover, according to this embodiment, the thermal switch 21 for control is disposed inside the temperature-sensitive case 22, and the temperature-sensitive case 22 is controlled by the spring force of the compression coil spring 24 and the flange 2 of the temperature-sensitive case 22.
2a so that the tub 13 protrudes a certain amount into the cover 18, so that the temperature-sensitive case 22 does not get in the way when installing or removing the tub 13 inside the cover 18, and the tub 13 can be easily inserted into the cover 18. Temperature sensitive case 22 when attached to
is always in elastic pressure contact with the outer wall of the tub 13, so that the control thermal switch 21 can reliably detect the temperature.

FIG. 4 is an electric circuit showing a second embodiment of the present invention,
The same parts as in FIG. 2 are designated by the same reference numerals, and only the different parts will be explained below.

That is, in this second embodiment, only the main heater 9a is used as the electric heater 9, and instead, the fixed contact piece of the changeover cam switch 31B is connected to the 1. It is designed so that it is connected to the fixed contact piece a.

According to this configuration, when the temperature of the part Y of the rice 320 (see FIG. 1) reaches the predetermined temperature Ta, the changeover cam switch 31B
When the contact piece (d-b) of the first Almost the same effects as in the embodiment can be obtained.

FIG. 5 is an electric circuit showing a third embodiment of the present invention,
The same parts as in FIG. 2 are designated by the same reference numerals, and only the different parts will be explained below with reference to FIG. 1.

In this third embodiment, a thermal switch 35 for detecting the end of steaming is used as a temperature sensing element for detecting the end of steaming in place of the timer 31, and this switch 35 is attached to the outer wall of the tank 3 as shown by the two-dot chain line in FIG. Attach to the bottom.

This thermal switch 35 for detecting the end of steaming is always closed, and all the water 33 in the tank 3 evaporates, leaving the tank 3 in an empty state (this is generally called dry-up).

), and when the temperature rises rapidly and this reaches the set temperature, it will open.

Then, the fixed contact piece of the selection switch 30 is connected to the bus bar 29 via the control thermal switch 21, the electric heater 9 (only the main heater 9a) and the buzzer 26 in series, and A diode 36 with the polarity shown is connected in series, and a thermal switch 35 for detecting the end of steaming is connected in series with the buzzer 26.

In such a configuration, a predetermined amount of water that generates steam for the time required for gelatinizing the Confucian rice 32 is supplied in advance into the tank 3, and the contact piece (d-b) of the selection switch 30 is closed. let

Then, between the contacts (d and b) of the selection switch 30, the thermal switch for control 21 and the thermal switch for steaming end detection 35
The main heater 9a is energized through the main heater 9a and generates heat at, for example, 800 W, thereby heating the water in the tank 3.

After that, when the temperature of the part Y of the Confucian rice 320 reaches a predetermined temperature Ta (for example, 100 degrees Celsius), this is detected and the control thermal switch 21 is opened, so the main heater 9a is opened.
is energized through the diode 36 to half the heating capacity (
For example, it starts to generate heat at 400cm.

When all the water in the tank 3 evaporates and the tank 3 dries up and its temperature reaches the set temperature, the thermal switch 35 for detecting the end of steaming detects this and opens the buzzer 26. is energized and makes a sound to notify the completion of steaming.

Therefore, in this third embodiment as well, substantially the same effects as in the previous embodiment can be obtained.

In addition, in FIGS. 4 and 5, the diodes 34 and 36
Instead of zero, an impedance element such as a capacitor or a reactor, or a rectifier element such as a SIRISK may be used.

In addition, the present invention is not limited only to the embodiments described above and shown in the drawings, but can be widely applied not only to rice cake making machines but also to rice steaming devices in general, etc., as appropriate without departing from the gist. Of course, modifications can be made.

As described above, the present invention can reduce the amount of water supplied to the steam generator, and as a result, the temperature of the rice can be raised quickly, the steaming time can be shortened, and the overall power consumption can be reduced. It is possible to provide a rice steaming device that has an excellent effect of reducing the amount of rice.

[Brief explanation of the drawing]

1 to 3 show a first embodiment in which the present invention is applied to a rice cake making machine. FIGS. 4 and 5 are electrical circuit diagrams showing second and third embodiments of the present invention, respectively. In the drawing, 1 is an outer box, 3 is a tank (steam generator), 9 is an electric heater, 9a is a main heater, 9b is an auxiliary heater, 10 is a drive motor, 13 is a tub (steaming container), 16 is an impeller,
17 is a lid body, 18 is a cover, 21 is a thermal switch for control (temperature sensing element for control), 22 is a temperature sensing case (temperature detection part)
, 24 is a compression coil spring, 26 is a buzzer, 30 is a selection switch, 31 is a timer, 32 is glutinous rice, 33 is water, 34
35 is a thermal switch for detecting the end of steaming (thermal element for detecting the end of steaming), and 36 is a diode.

Claims (1)

[Scope of Claims] 1. In a rice steaming device that steams rice by supplying steam from a steam generator heated by an electric heater to rice stored in a steaming container, the temperature rise of the rice is representative of the temperature rise of the rice. A rice steaming device characterized by being provided with a control temperature sensing element which detects the temperature of the part and is activated when the temperature reaches a predetermined temperature to reduce the heat generation capacity of the electric heater. 2. End of steaming: supplying water in an amount to generate steam for the time required for gelatinizing the rice to the steam generator, and detecting the end of steaming the rice by detecting the temperature change due to drying up of the steam generator. 2. The rice steaming apparatus according to claim 1, further comprising a temperature sensing element for detection. 3. Claim 1, characterized in that a timer is provided which detects the end of steaming of rice by starting a meter operation when the temperature sensing element for control is activated and ending the time measurement operation for a certain period of time. rice steaming equipment. 4. The rice steaming apparatus according to any one of claims 1 to 3, characterized in that the temperature sensing element for control has a temperature detection part that elastically contacts the outer wall of the steaming container.