JPH10339401A - Steam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure arbitrary steam temperature and safely shorten time till steam generation since starting of operation in a steam generator wherein it generates overheated steam used for cooking, air conditioning, and cleaning, etc. SOLUTION: The present steam generator includes steam generating means 10 for vaporizing overheating water with a heater 11, water supply means 16 for supplying water to the stream generating means 10, temperature detector means 24 for detecting the temperature of generated steam, and control means for controlling the steam generating means 10 and the water supply means 16 in response to detected temperature of the temperature detractor means 24 wherein the calorific value of the steam generating means 10 is varied such that steam temperature becomes predetermined one by the control means, and the amount of supply water of the water supply means 16 is varied to a plurality of previously set values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food processing process such as defrosting, cooking or bread for home or business use, air conditioning, washing, and the like.
The present invention relates to a steam generator used for clothing press, sterilization, and the like.

[0002]

2. Description of the Related Art A conventional steam generator used in the cooking field, for example, is a boiler 1 which is a steam generator as shown in Japanese Utility Model Publication No. Sho 60-26243 shown in FIG. 6 (a sectional view of a conventional steam generator). Has an ultrasonic vibrator 4 for atomizing the water 3 on the inclined bottom surface 2, a heater 5 for heating the water to produce steam on the lower outer periphery, and a heater 6 for heating the steam above. .

In the above configuration, the water 3 supplied to the boiler 1 is heated by a heater 5 to become steam, and is further heated again by a heater 6 to be supplied into a heating chamber. Further, due to the synergistic effect of the heaters 5 and 6 and the ultrasonic vibrator 4, overheated steam in the form of fine mist with fine particles can be obtained.

[0004]

However, in the conventional steam generator, since the water is stored in the boiler 1 and heated by the heater 5, much time is required for the temperature of the water to increase, and the steam generation is delayed accordingly. Further, since there is no temperature detecting means for feeding back the steam temperature, the steam temperature is not determined by the amount of steam generated or the water temperature, and the steam effect on the cooking ingredients is not stable. Further, if heating is performed by the heater 6 in a state where sufficient steam is not generated, sufficient heat transfer from the steam flow to the inner surface of the boiler 1 cannot be obtained, and the boiler 1 may be overheated and damaged. In addition, the configuration for storing water has another problem that the water in the boiler 1 rots, which is inconvenient for hygiene.

[0005]

In order to solve the above-mentioned problems, the present invention provides a steam generating means having a heating element for vaporizing water and overheating, and a water supply means for supplying water to the steam generating means. A temperature detecting means for detecting a steam temperature of the steam generated by the steam generating means, and a control means for controlling the steam generating means and the water supply means in accordance with the temperature detected by the temperature detecting means, Means for varying the amount of heat generated by the steam generating means so that the steam temperature becomes a predetermined temperature by means, and varying the amount of water supplied to the water supply means to a plurality of preset values. The temperature is controlled to a predetermined temperature by controlling the amount of heat generated by the steam generating means, and the amount of steam is also variably controlled to a plurality of preset values of the amount of water supplied by the water supply means. sex It is possible to supply the high vapor can be set cooking conditions with confidence. Further, since the steam temperature is directly detected, abnormal heating and the like can be prevented. further,
Since the supply amount of water can be varied according to the steam temperature, the supply amount of water can be reduced at the start of operation of the steam generation means, the temperature rise speed of the steam temperature can be increased, and the time until steam generation can be shortened.

[0006]

DETAILED DESCRIPTION OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention comprises a steam generating means having a heating element for evaporating water and overheating, and supplying water to the steam generating means. Water supply means, a temperature detection means for detecting a steam temperature of the steam generated by the steam generation means, and a control means for controlling the steam generation means and the water supply means in accordance with the temperature detected by the temperature detection means. A steam generator that varies the heat generation amount of the steam generation unit so that the steam temperature becomes a predetermined temperature by the control unit, and changes the water supply amount of the water supply unit to a plurality of preset values. Yes, the steam temperature is controlled to a predetermined temperature by controlling the heat generation amount of the steam generation means, the steam amount also variably controls the water supply amount of the water supply means to a plurality of preset values, when used for cooking or the like, Temperature, quantity It is possible to supply steam highly reliable reproducible also be set cooking conditions with confidence.

In the invention according to a second aspect of the present invention, the control means controls when the temperature detected by the temperature detecting means exceeds a predetermined time from the first predetermined temperature or when the second temperature is higher than the first predetermined temperature. The steam generating device according to claim 1, wherein the steam generating device and the water supply device are stopped when the temperature exceeds a predetermined temperature, and when the steam temperature abnormally rises due to an abnormality of the steam generating device, For a rapid temperature increase with a high degree of urgency, the operation is stopped at a stage where the temperature exceeds the second predetermined temperature, and for a gradual temperature increase such as temporary air mixing into the water supply system, the first temperature is raised. Since it stops when the temperature exceeds the predetermined temperature and the temperature does not decrease and the predetermined time has passed, thermal damage due to abnormal heating of the steam generating means can be prevented, and malfunction of abnormal stop can be reduced. Kill.

According to a third aspect of the present invention, when the steam generating means is stopped by the control means, the water supply means is stopped by stopping the power supply to the steam generating means and then delaying the water supply means by a preset time. The steam generator according to claim 1 or 2, wherein when the steam generating means is stopped, the heating element is not immediately cooled by the residual heat even if the power supply to the steam generating means is stopped. Since the water is continuously supplied for a preset time, the water supply means stops after the residual heat of the heating element is cooled. Therefore, after the operation is stopped, the discharge of high-temperature steam due to the residual heat of the heating element can be prevented.

According to a fourth aspect of the present invention, the control means controls the water supply amount of the water supply means from the first water supply amount smaller than the second water supply amount in proportion to the rise in steam temperature. 2. The method according to claim 1, wherein the second water supply amount is varied.
The steam generator according to any one of the preceding claims, wherein when the initial water holding amount of the steam generating means is large, the rate of increase in the steam temperature is slow. on the other hand,
If the initial water retention is small, the temperature rise rate will be faster. Therefore, when the rising speed is slow, the water amount is slowly increased from the first water supply amount to the second water supply amount, and when the rising speed is fast, the water amount is rapidly increased, so that the predetermined steam temperature is quickly reached. In addition, the time until a predetermined amount of steam is generated can be reduced.

According to a fifth aspect of the present invention, the water supply amount of the water supply means is controlled by the control means, and the water supply amount is set to the second value at the start of operation.
The steam generator according to claim 1, wherein the first water supply amount is set to be smaller than the water supply amount, and the water supply amount is switched to the second water supply amount after a predetermined time has elapsed. By setting, the heat load on the steam generating means is reduced, the rate of temperature rise of the heating element is increased, and after a predetermined time necessary for enabling the steam generating means to generate steam is switched to the original predetermined water amount. Thereby, the time until a predetermined amount of steam is generated can be shortened.

Further, since the switching to the second water supply amount for increasing the water supply amount is performed by time control, the temperature of the steam generating means does not rise too much due to the detection delay as in the case where the steam temperature is detected and switched.

According to a sixth aspect of the present invention, the water supply amount of the water supply means is controlled by the control means, and the water supply amount is set to the second value at the start of operation.
5. The method according to claim 1, wherein the first water supply amount is set to be smaller than the first water supply amount, and the second water supply amount is switched when the steam temperature exceeds a predetermined value or a predetermined time has elapsed. The steam generator according to any one of the preceding claims, wherein switching from the first water supply amount to the second water supply amount is slow when the temperature rising speed is slow, and fast when the rising speed is fast, A predetermined steam generation temperature can be quickly reached, and the time until a predetermined amount of steam is generated can be shortened.

[0013] Further, even if the detection of the steam temperature is delayed, after a predetermined time has elapsed, switching to increase the water supply amount is performed, so that the temperature of the steam generating means can be prevented from excessively rising.

According to a seventh aspect of the present invention, the temperature detecting means is located at the steam outlet of the steam generating means.
2. The detection unit according to claim 1, wherein the detection unit is disposed upward.
Erroneous detection of steam temperature because the condensation unit generated at the beginning of the operation of the steam generation unit does not accumulate dew condensation in the detection unit of the temperature detection unit by arranging the detection unit upward. Can be prevented.

Further, the invention according to claim 8 of the present invention is characterized in that a drying mode is provided in which the water supply means is stopped by the control means and the steam generation means is operated at a predetermined calorific value for a predetermined time. The steam generator according to claim 1,
By evaporating and drying the water remaining in the steam generating means, decay of the remaining water can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Embodiment 1 FIG. 1 is a sectional view of a steam generator according to Embodiment 1 of the present invention. FIG. 2 is a control flowchart of the steam generator.

In FIG. 1, reference numeral 10 denotes a steam generating means, which has a columnar heating element 11 therein, and a heating chamber 13 provided with an exciting coil 12 on the outer periphery so as to cover the heating element. A water supply port 14 for dropping water to the heating element 11 and an outlet 15 for taking out steam to the outside are provided below.

The heating chamber 13 is formed of a heat-resistant material such as heat-resistant glass or ceramic, which is a nonmetallic body, in a cylindrical shape.
The exciting coil 12 is formed by winding a conductive wire.

Reference numeral 16 denotes a water supply port 14 for supplying water from a water supply tank 17.
In this embodiment, a pump is used as water supply means for supplying water.

Reference numeral 18 denotes control means for controlling the amount of heat generated by the steam generating means 10 and the amount of water supplied by the water supply means 16.

The heating element 11 is made of a metal having good water resistance and corrosion resistance, such as Ni, Ni-Cr alloy, stainless steel alloy, etc., and is made of a porous and continuous skeleton. This heating element 1
A water absorbing body 19 is wound around the outer periphery of 1, and a gap between the heating chamber 13 and the inner surface is filled with the water absorbing body 19.

The water absorber 1 is also provided on the upper surface of the heating element 11.
9, the water from the water supply port 14 is diffused throughout the water absorbing body 19, and water is supplied from the upper surface and the outer periphery of the heating element 11.

The water absorbing member 19 is made of a fiber such as ceramic fiber, glass fiber, rock wool and the like, which has good water absorption and excellent water resistance and heat resistance. Note that a configuration using resin fibers having high heat resistance is also possible.

The control means 18 includes a pump drive circuit 20 for variably driving the amount of water supplied from the water supply means 16 and an inverter for generating AC power to the exciting coil 12 for variably generating the heat generated by the steam generation means 10. A high-frequency power supply circuit 21 which is a circuit, a setting unit 22, and a steam amount adjusting means for controlling the pump drive circuit 20 and the high-frequency power supply circuit 21 according to the setting state of the required steam amount and the required steam temperature of the setting unit 22. The control unit 23 is provided.

The control means 18 inputs the steam temperature detected by the temperature detecting means 24 provided at the outlet 15 and
3, and the control unit 23
The high-frequency power supply circuit 21 and the pump drive circuit 20 are controlled according to the detected temperature.

The temperature detecting means 24 has a detecting portion 26 disposed upward in the center of the outlet 15. This upward arrangement is to prevent an error due to dew condensation on the temperature detecting means 24. When the temperature detecting means 24 is cooled at the beginning of the operation, moisture is generated on the surface of the temperature detecting means 24 when steam passes through the surroundings. Condensed and condensed. In this case, even if the steam of 100 ° C. or more flows, it can only be detected at 100 ° C., and a detection error occurs. Therefore, the detecting unit 26 at the tip of the temperature detecting unit 24
By arranging upward, the condensed water flows down and the surroundings of the detection unit 26 can be maintained in a dry state.
Detection errors can be prevented. Note that the upward angle may be any angle at which the condensed water flows down.

The operation and operation of the above configuration will be described. When the high-frequency power supply circuit 21 starts, AC power is sent to the exciting coil 12, and AC magnetic force lines are generated around the exciting coil 12. These alternating magnetic force lines pass through the heating element 11. When the direction of the magnetic field lines changes in accordance with the supplied alternating current cycle, an electric force acts on the heating element 11 to prevent the change in the magnetic field lines, and the eddy current flows in the heating element 11 in a direction opposite to the coil current. Is induced. The heating element 11 generates heat by the induced current induced. This induced current flows through the skeleton of the heating element 11, and the heating element 11 is in a heating state over the entire surface. That is, electromagnetic induction heating is performed. On the other hand, the water supplied from the water supply means 16 is dripped from the water supply port 14 to the water absorbing body 19, and this water is diffused throughout the water absorbing body 19 by capillary action, and at the same time, the heating element 11
Penetrate into the porous space. The water that has permeated the heating element 11 is heated and vaporized to form steam, and the outlet 1
It is blown out from 5.

According to the first embodiment of the present invention, since the heating element is made of a porous metal body, the heating element has a large surface area, and the space formed inside the heating element 11 allows water to permeate and vapor to escape. And the heat generation efficiency is high, and the speed up to steam generation is also high.

Further, the generated steam passes through the inside of the porous metal body by its own steam pressure, and is further heated, so that superheated steam of 100 ° C. or more can be taken out. this is,
The amount of water supplied to the water supply means 16 can be easily set by increasing the power supplied to the exciting coil.

Next, the flow chart of the control means 18 of FIG. 2 will be mainly described. In step 27 of FIG. 2, the steam temperature level Ts set by the setting unit 22 (for example, Ts: set at 150 ° C.)
Read. In step 28, the second set value of the water supply means 16 is set as the steam amount similarly set by the setting unit 22.
(For example, Ws: 10 cc / min) is read.

In step 29, the detected temperature T is a second predetermined temperature Tlim2 (for example, T
lim2: 200 ° C.), and if it does, the supply power P of the high-frequency power supply circuit 21 is stopped and set in step 30, and the set water supply amount W of the pump drive circuit 20 is also set to stop at the same time. Then, in step 31, the steam generation means 10 and the water supply means 16 are stopped.

If the detected temperature T is equal to or lower than the second predetermined temperature Tlim2 in step 29, the detected temperature T is determined in step 32.
Is the first predetermined temperature Tlim1 (for example, Tlim1: 17
(0 ° C.). That is, the detected temperature T is in the range of Tlim1 to Tlim2 (for example, 170 to
(200 ° C). Therefore, T
lim2 is set higher than Tlim1. Here, if the detected temperature T exceeds Tlim1, the elapsed time Tcount is set to the predetermined time Tims in step 33.
It is determined whether or not (for example, Tims: 10 seconds) has been exceeded, and if it has been exceeded, the process proceeds to steps 30 and 31 to stop the steam generation means 10 and the water supply means 16.

If the detected temperature T is equal to or lower than the first predetermined temperature Tlim1 in step 32, or if the elapsed time Tcount is equal to or shorter than the predetermined time Tims in step 33, the supply for determining the heat generation amount of the steam generating means 10 is determined in step 34. The power P is calculated based on the equation (1).

P = K1 · (Ts−T) + Ps (1) where K1 is a proportional gain, Ts is a set temperature set by the setting unit 22, and Ps is a reference power.

That is, the supply power P is controlled so that the detected temperature T approaches the set temperature Ts. On the other hand, when the detected temperature T rises rapidly as in the case of failure of the high-frequency power supply circuit 21 or the water supply means 16, the second predetermined temperature Tlim
2 is determined in step 29, and step 3
0, In step 31, the operation of the supply power and water supply means is stopped. Therefore, it can be stopped in a short time.

In the case of a failure that changes slowly, such as clogging of the heating element 11, it takes time to raise the temperature.
Since the detected temperature T is damaged before the temperature exceeds the second predetermined temperature Tlim2, in order to prevent this, the detected temperature T exceeds the first predetermined temperature Tlim1 and the elapsed time Tcount is equal to the predetermined time. If it exceeds Tims, determinations are made in steps 32 and 33, respectively, and in step 30, the operation of the power supply and water supply means 16 is stopped. In other words, even if the temperature rises slowly, a time limit is provided so that the failure can be reliably stopped before damage is caused.

In step 35, the set water supply amount W proportional to the detected temperature T is calculated based on the equation (2).

W = K2 · T (2) where K2 is a proportional gain.

In step 36, if the set water supply amount W is equal to or less than the first water supply amount WL (for example, 3 cc / min), step 3 is executed.
At step 7, the set water supply amount W is set to WL. At step 38, if the set water supply amount W exceeds the second water supply amount Ws, the set water supply amount W is set to Ws at step 39. Here, when the steam temperature is low, the water supply amount is set to the low water amount WL, and the water supply amount is increased to Ws with the temperature rise, whereby the steam generation means 1 is increased.
The speed from the start of operation of 0 to the generation of steam is improved.

The major factors that delay the generation of steam by the steam generating means 10 are the amount of water held by the heating element 11 itself, the amount of water held by the water absorbing body 19 and the amount of water supplied, in addition to the heat capacity of the heating element 11. Steam does not evolve until these temperatures rise to around 100 ° C. If there is a large amount of new water supply, the temperature rise will be greatly delayed. Therefore, the steam generation can be accelerated by reducing the amount of water supply until the generated steam temperature reaches nearly 100 ° C.

From the above, the proportional gain K2 indicates that when the detected temperature T is close to 100 ° C. (for example, 90 ° C.), the set water supply amount W
May be set to a second water supply amount Ws (for example, Ws: 10 cc / min). Therefore, K2 = Ws / T
(For example, 10/90 = 0.11 cc / min · ° C.).

Step 40 outputs a drive signal to the high frequency power supply circuit 21 based on the supply power P calculated in step 34. Step 41 outputs a drive signal to the pump drive circuit 20 based on the set water supply amount W.

(Embodiment 2) FIG. 3 is a control flow chart of a steam generator according to Embodiment 2 of the present invention.

The difference between the second embodiment and the first embodiment is that the end of the steam generation is determined in step 42, and if the end is determined, the high-frequency power supply circuit 21 is stopped in step 43, and then in step 44 The point is that the pump drive circuit 20 is stopped in step 45 with a delay time provided for the set time. Step 29 and Step 3
2. Similarly, in the stop operation determined in step 33, the pump drive circuit 20 also stops with a delay.

The components having the same reference numerals as those of the first embodiment have the same structure, and the description is omitted. Next, the operation and operation will be described. When the high-frequency power supply circuit 21 is stopped in step 43,
Although not immediately cooled by the residual heat due to the heat capacity of the heating element 11, the water is delayed by step 44 and the water
6 continues to be supplied until stopped at step 45,
After the residual heat of the heating element 11 is cooled, it can be stopped.
Therefore, it is possible to prevent steam generated due to residual heat after the operation is stopped, and it is possible to perform accurate control. If the delay time is set long, water can be passed through the heating element 11 and the water absorbing body 19 for cleaning. In the case of generating steam, evaporation residues such as scale components contained in water mainly adhere to the heating element 11 to cause clogging. However, washing out at the time of this cleaning increases the life due to clogging. Can be.

(Embodiment 3) FIG. 4 is a control flowchart of a steam generator according to Embodiment 3 of the present invention.

The third embodiment is different from the first embodiment in that when the detected temperature T exceeds a predetermined temperature Th (eg, Th: 90 ° C.) set in step 46, the set water supply amount W is set in step 47. Is set to the second water supply amount Ws, and even if the detected temperature T does not exceed Th in step 46, if it is determined in step 48 that the predetermined time has elapsed, W is set to Ws. If the detected temperature T is equal to or lower than Th and within a predetermined time, the set water supply amount W is set to the first water supply amount WL in step 49. Here, the first water supply amount WL is the first embodiment.
Similarly to the above, the water supply amount is set to be smaller than the second water supply amount Ws (for example, WL: 3 cc / min, Ws: 10 cc / min).

The components having the same reference numerals as in the first embodiment have the same structure, and the description will be omitted. Next, the operation and action will be described. In steps 46 and 48, the water supply amount is reduced to a low water supply amount WL until the temperature rise after the operation of the steam generating means 10 reaches nearly 100 ° C.
The heat load on the steam generating means 10 is reduced. Thereby, the temperature rising speed of the heating element 11 is increased, and the time until steam is generated is shortened. After that, the original water supply amount Ws is set and the water supply time at the low water supply amount WL is limited by the elapsed time determination in step 48 because the temperature detecting means 24 is wet or the steam flow distribution This is to prevent the temperature of the steam generating means 10 from rising too high due to the detection delay caused by the above. Further, since the water supply amount setting is switching between the first water supply amount and the second water supply amount, the control configuration is simplified. In addition, even if the set value of the first water supply amount is zero, it is effective.

(Embodiment 4) FIG. 5 is a control flowchart of a steam generator according to Embodiment 4 of the present invention.

The difference between the fourth embodiment and the first embodiment is that it is determined in step 50 whether to shift to the drying mode or to perform the normal operation mode in step 51.
When the drying mode is selected at 0, the water supply is stopped by stopping the driving of the water supply means 16 at step 52, and at the same time, the supply power P of the high frequency power supply circuit 21 is reduced to the low level power P.
Set to L. In step 53, it is determined whether or not a predetermined time has elapsed since the shift to the drying mode. If it is within the predetermined time, in step 54, the supply power P of the high frequency power supply circuit 21 is continuously supplied at the low level power PL.
If the predetermined time has elapsed in step 53, the low-level power supply PL of the high-frequency power supply circuit 21 is stopped in step 55, and the drying mode is ended.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted. Next, the operation and operation will be described. The drying mode signal in step 50 is artificially input from the setting unit 22, and when the drying switch (not shown) is turned on, the mode shifts to the drying mode. Step 5
The normal operation mode 1 is the control itself of the steam generator shown in the first embodiment.

In the drying mode, the water supply is stopped, and the steam generating means 10 is operated with the low-level power PL for a predetermined period of time so that the steam contained in the heating element 11 and the water absorbing body 19 is evaporated and dried. The level power PL is the heating element 1
1 and the water absorbing body 19 even when the moisture is sufficiently contained.
This is a value at which the temperature of the heating element 11 is not suddenly increased even when the temperature of 1 is increased to 100 ° C. or more and moisture is eliminated. However, even if the power is properly set, long-time idling will cause thermal damage to the steam generating means 10. Therefore, it is determined whether or not a predetermined time has passed by setting a sufficient time for drying as a predetermined time in step 53, If the time is exceeded, stop the drying operation. This drying can prevent decay of water inside the steam generating means 10, so that it is convenient when not used for a long time. Further, since water is drained, there is no liquid leakage at the time of movement, and the weight can be reduced. Note that the low-level power PL may be gradually reduced with time to cope with a load reduction due to moisture evaporation. Further, the predetermined time may be counted after the temperature detected by the temperature detecting means 24 starts to decrease. This is because the outlet 15 in which the temperature detecting means 24 is installed is located below the heating element 11, so that if water evaporates, the flow of steam stops and the temperature starts to decrease. This timing is used.

In each of the above embodiments, the heating element 11 was used.
Has been described as being made of a porous metal body, but also includes a metal body having open cells and a metal body having fine through holes. That is, the porous metal body may be any porous body having a large number of through holes in the metal skeleton.

Further, not only a porous metal but also a magnetic metal wire such as a stainless alloy may be bundled in a columnar shape.

In the above embodiment, the water supplied from the water supply means 16 is dropped on the heating element 11 to evaporate. However, the outlet 15 is provided on the upper part, and a part or the whole of the heating element 11 is provided. The same effect can be obtained by generating steam by immersing in water and blowing out the steam from the upper outlet 15.

Further, although a pump is used for the water supply means 16 in the above embodiment, a water supply tank 17 may be provided at a position higher than the heating means, and the water amount may be controlled by the valve opening degree using the head. .

Further, in the above embodiment, water is evaporated, but when it is used for oil vaporization in a vaporizer of an oil burner, petroleum fuel may be vaporized instead of water.

[0058]

As described above, according to the first aspect of the present invention, the control means of the steam generating device varies the amount of heat generated by the steam generating means so that the steam temperature becomes a predetermined temperature, and supplies water. Since the water supply amount of the means is configured to be variable to a plurality of preset values, the steam temperature can be controlled to any predetermined temperature, and the steam amount can be set to an arbitrarily set value of the water supply amount of the water supply means. When used for cooking or the like, it is possible to supply highly reliable steam with high reproducibility in both steam temperature and amount, so that there is an effect that cooking conditions can be set with confidence.

According to the invention described in claim 2 of the present invention, the control means determines whether the temperature detected by the temperature detecting means has become equal to or higher than the first predetermined temperature and the state exceeds a predetermined time, or When the steam generation means and the water supply means are stopped when the second predetermined temperature higher than the first predetermined temperature is exceeded, when the steam temperature rises abnormally due to an abnormality in the steam generation device, a sudden temperature with a high degree of urgency is required. Against the rise,
Stop at the stage where the temperature exceeds the second predetermined temperature, and with respect to a gradual temperature rise such as temporary air mixing into the water supply system, if the temperature does not decrease after exceeding the first predetermined temperature for a predetermined period of time. In this case, thermal damage can be prevented even when the temperature of the steam generating means is different due to abnormal temperature rise, and the malfunction of abnormal stop can be reduced.

According to the third aspect of the present invention, when stopping the steam generating means, the control means stops the supply of electric power to the steam generating means and then delays the water supply by a preset time. Since the supply unit is stopped, water is continuously supplied for a preset time even after the power supply to the steam generation unit is stopped, so that the residual heat of the heating element can be cooled, and the discharge of high-temperature steam due to the residual heat of the heating element can be prevented. Further, there is an effect that the evaporation residue deposited on the heating element or the like is washed away, clogging is suppressed, and the life is extended.

According to the fourth aspect of the present invention, the control means sets the water supply amount of the water supply means to the first water supply amount smaller than the second water supply amount in proportion to the temperature rise of the steam temperature. Since the amount is changed from the amount to the second amount of water, the amount of water is slowly increased from the first amount of water to the second amount of water when the temperature rising speed is slow, and the amount of water is increased rapidly when the rising speed is fast. Thereby, the predetermined steam temperature can be quickly reached, and the time required for generating the predetermined amount of steam can be shortened.

According to the fifth aspect of the present invention, the control means sets the control of the water supply means to the first water supply amount smaller than the second water supply amount at the start of operation, and It switches to the second water supply after the passage of time, and by setting the low water supply at the start of operation of the steam generating means,
The heat load on the steam generating means is reduced to increase the temperature rising speed of the heating element, and after a predetermined time necessary for enabling the steam generating means to generate steam is reached, the amount of water is switched to the original predetermined water amount, whereby the predetermined amount of water is reduced. The time until the steam is generated can be shortened.

Further, by performing the switching to increase the water supply amount with time, it is possible to prevent the temperature of the steam generating means from rising too much due to a delay in temperature detection as in the case of switching by the steam temperature.

According to the sixth aspect of the present invention, the control means controls the amount of water supplied by the water supply means,
The first water supply amount is set to be smaller than the first water supply amount, and the second water supply amount is set when the steam temperature exceeds a predetermined value or when a predetermined time has elapsed.
When the temperature rising speed is slow, the switching from the first water feeding amount to the second water feeding amount is slowed down, and when the temperature rising speed is fast, the switching is fast, so that the simple switching is performed. The predetermined steam generation temperature can be quickly reached only by the operation, and the time until a predetermined amount of steam is generated can be shortened. In addition, even if the detection of the steam temperature is delayed, the water supply amount is switched after a predetermined time has elapsed, so that the temperature of the steam generating means can be prevented from excessively rising.

According to a seventh aspect of the present invention, the temperature detecting means is located at the steam outlet of the steam generating means.
Since the detection unit is arranged upward, dew condensation due to condensation generated at the initial stage of steam temperature detection does not accumulate in the detection unit.
There is an effect that erroneous detection can be prevented.

Further, the invention according to claim 8 of the present invention is provided with a drying mode in which the water supply means is stopped by the control means and the steam generation means is operated at a predetermined calorific value for a predetermined time. By evaporating and drying the remaining water, there is an effect that rot of the remaining water can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a steam generator according to Embodiment 1 of the present invention.

FIG. 2 is a control flowchart of the steam generator.

FIG. 3 is a control flowchart of a steam generator according to Embodiment 2 of the present invention.

FIG. 4 is a control flowchart of a steam generator according to Embodiment 3 of the present invention.

FIG. 5 is a control flowchart of a steam generator according to Embodiment 4 of the present invention.

FIG. 6 is a cross-sectional view of a conventional steam generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steam generation means 11 Heating element 16 Water supply means 18 Control means 24 Temperature detection means 26 Detection part

Claims (8)

[Claims] 1. A steam generating means having a heating element for evaporating water and overheating water, a water supply means for supplying water to the steam generating means, and detecting a steam temperature of the steam generated by the steam generating means. Temperature detecting means, and control means for controlling the steam generating means and the water supply means in accordance with the temperature detected by the temperature detecting means, wherein the control means controls the steam generation so that the steam temperature becomes a predetermined temperature. A steam generator which varies a calorific value of the means and varies a water supply amount of the water supply means to a plurality of preset values. 2. The method according to claim 2, wherein the control means generates steam when the temperature detected by the temperature detecting means exceeds a first predetermined temperature for a predetermined time or exceeds a second predetermined temperature higher than the first predetermined temperature. The steam generator according to claim 1, wherein the means and the water supply means are stopped. 3. The method according to claim 1, wherein when the control means stops the steam generating means, the water supply means is stopped after a predetermined time delay after the power supply to the steam generating means is stopped. Or the steam generator according to 2. 4. The water supply amount of the water supply means is controlled by the control means.
The steam generator according to claim 1, wherein the second water supply amount is changed from the first water supply amount smaller than the second water supply amount to the second water supply amount in proportion to a temperature rise of the steam temperature. 5. The water supply amount of the water supply means is controlled by the control means.
2. The steam generator according to claim 1, wherein the first water supply amount is set to be smaller than the second water supply amount when the operation is started, and is switched to the second water supply amount after a lapse of a predetermined time. 6. The water supply amount of the water supply means is controlled by the control means.
At the start of the operation, the first water supply amount is set to be smaller than the second water supply amount, and the operation is switched to the second water supply amount when the steam temperature exceeds a predetermined value or a predetermined time has elapsed. Item 5. The steam generator according to any one of Items 1 to 4. 7. The steam generator according to claim 1, wherein the temperature detecting means is located at a steam outlet of the steam generating means, and the detecting section is disposed upward. 8. The water supply means is stopped by the control means,
The steam generator according to claim 1, further comprising a drying mode in which the steam generating means is operated at a predetermined calorific value for a predetermined time.