JP2554639B2 - Kitchen waste incinerator - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) [0001] The present invention relates to a kitchen waste incinerator for incinerating kitchen waste housed in an incinerator by high-frequency heating.

(Prior Art) In recent years, the incineration of garbage has spread remarkably to each household, and garbage disposal in each household is progressing.

However, with regard to kitchen waste such as raw garbage, it is difficult to dispose of garbage in a conventional incinerator due to the large amount of water content, which is a problem in processing.

For this reason, an incineration method using dielectric heating using microwaves, so-called high-frequency heating, has been proposed.

According to this method, similar to the heating method usually used for microwave ovens, etc., since it is heated by stirring with molecular high-frequency waves that constitute kitchen waste such as food waste, Even large amounts of kitchen waste can be effectively heated and incinerated.

(Problems to be solved by the invention) In the garbage incinerator that incinerates garbage such as garbage using high-frequency heating as described above, when the garbage to be incinerated is not in the incinerator, Alternatively, it is uneconomical to operate the device in an unloaded state such as when the incineration has ended, and the microwave radiated from the magnetron is reflected by the inner wall of the incinerator. There is a problem that the life of the magnetron is shortened because the reflected microwave hits the magnetron itself.

The present invention has been made in view of the above, and an object thereof is to provide a kitchen refuse incinerator that reliably prevents the operation of the incinerator in the unloaded state.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention is directed to an incinerator that radiates a high frequency to incinerate the kitchen waste to be incinerated and incinerates it. The device, a no-load detection means for detecting both the no-load state in the incinerator in the state where there is no kitchen to be incinerated and the state in which the kitchen to be incinerated has finished incineration, and this no-load The gist of the present invention is to have stop means for stopping the emission of high frequency waves into the incinerator when the unloaded state is detected by the detection means.

(Operation) In the kitchen waste incinerator of the present invention, both the no-load state in the incinerator in the state where there is no kitchen waste to be incinerated in the incinerator and the kitchen waste to be incinerated has been detected,
When no load condition is detected, the high frequency radiation to the incinerator is stopped.

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

FIG. 1 is a block diagram showing a circuit configuration of a kitchen refuse incinerator according to an embodiment of the present invention. The kitchen refuse incinerator shown in FIG. 1 is operated by the AC voltage supplied to the input power terminal 49. This AC voltage is supplied to the magnetron 9 via the power switch 47, and the magnetron 9 is actuated by this to generate microwaves. This microwave is supplied to the incinerator 2 through the waveguide 8, and thereby the kitchen waste such as kitchen refuse, which has been put into the incinerator 2, is incinerated by high-frequency heating.

An exhaust duct 26 is connected to the incinerator 2, a fan 22 rotating by the motor 2 is arranged in the middle of the exhaust duct 26, and exhaust gas discharged from the exhaust duct 26 near the outlet of the exhaust duct 26. A temperature sensor 25 for detecting the temperature is provided. The temperature sensor 25 detects the temperature of the exhaust gas discharged from the exhaust duct 26 to detect the incineration temperature in the incinerator 2. It should be noted that the fan 22 is always operated when an AC voltage is supplied to the device through the input power supply terminal 49 and the device is operated to perform the exhaust operation to the inside of the incinerator 2.

The exhaust gas temperature detected by the temperature sensor 25 is supplied from the temperature sensor 25 to the temperature detection circuit 41. The temperature detection circuit 41 has a function of comparing the detected temperature supplied from the temperature sensor 25 with a predetermined set temperature and outputting a reset signal when the detected temperature is equal to or higher than the set temperature, whereby the detected temperature is set to the predetermined temperature. It is determined whether or not the temperature is equal to or higher than the set temperature of.

The output of the temperature detection circuit 41 is connected to the timer counter 43, and when the reset output signal of the temperature detection circuit 41 is supplied to the timer counter 43, the timer counter 43 is reset by this. 43
In this case, when the kitchen waste incinerator operates to supply the microwave from the magnetron 9 to the incinerator 2, and when the incinerator 2 starts the incineration operation by the high frequency heating, the counting operation is started immediately. Then, as a result of this counting operation, when the timer counter 43 overflows after a lapse of a predetermined time TH1, the timer counter 43 outputs an overflow signal, and this overflow signal is supplied to the power supply control circuit 45. The output of the power supply control circuit 45 is connected to the power supply switch 47, and when an overflow signal is supplied from the timer counter 43, the power supply switch 47 is opened, whereby the magnetron 9 via the input power supply terminal 49 is supplied. The supply of the AC operating voltage is stopped. That is, the timer counter 43 starts counting when the incinerator of the kitchen waste operates to start the incineration operation, and when a predetermined time TH1 elapses and overflows, the magnetron 9 is passed through the power control circuit 45.
The supply of operating voltage to the equipment is stopped, and the incineration operation is stopped.

However, the temperature in the incinerator 2 rises due to the start of the incineration operation described above, and this temperature is detected by the temperature sensor 25, and when the temperature detection circuit 41 exceeds the predetermined set temperature, the temperature detection circuit 41 outputs the temperature. The timer counter 43 is reset by the reset signal to prevent overflow. That is, magnetron 9
When the incineration temperature in the incinerator 2 becomes equal to or higher than a predetermined set temperature as a result of the incineration operation due to the operation of, the timer counter 43 is reset by the reset signal from the temperature detection circuit 41 and does not overflow. Therefore, in this case, the supply of the operating voltage to the magnetron 9 is continued without stopping and the incineration operation is also continued.

2 (a) and 2 (b) are sectional views showing the structure of the garbage incinerator of FIG. 1, and FIG. 2 (a) is a sectional view from the side of FIG. FIG. 2B is a sectional view from the second side opposite to the side of FIG.

As shown in FIGS. 2 (a) and 2 (b), the entire garbage incinerator, the whole of which is housed in the outer box 1, has an incinerator 2 made of porcelain or the like on one side of the upper part of the outer box 1. It is arranged.
A gap, that is, a gap 29 is formed around the incinerator 2, a heat insulating material 10 is arranged around the gap 29, and an inner box 11 is arranged around the heat insulating material 10.

A bottom lid 3 is attached to the bottom of the incinerator 2 so as to be freely opened and closed by a hinge 3b, that is, one end on the hinge 3b side is slightly inclined with respect to the other end. The bottom lid 3 can be opened and closed by a motor 39 arranged near the hinge 3b. In addition, at the edge of the bottom lid 3, a choke 3a is formed so as to surround the outer periphery of the incinerator 2.
The choke 3a prevents microwaves in the incinerator 2 from leaking to the outside. Furthermore, an ash storage box 7 is arranged below the bottom cover 3, and when the bottom cover 3 is opened, the ash after incineration in the incinerator 2 falls into the ash storage box 7 and accumulates. There is.

An intake hole 12 and an exhaust hole 13 are arranged facing each other near the open upper end of the incinerator 2. The intake hole 12 and the exhaust hole 13 are composed of a large number of small holes that do not leak microwaves in the incinerator 2. The intake hole 12 communicates with a gap 29 around the incinerator 2, and this gap 29
The air for combustion from is supplied into the incinerator 2. The exhaust hole 13 is connected to one end of the heat exchange inlet duct 20, and the incinerator 2
Water vapor, smoke, etc. generated inside are discharged through the heat exchange inlet duct 20. An exhaust hole 11c is provided in a portion corresponding to the side wall of the inner box 11 near the exhaust hole 13 inside the heat exchange inlet duct 20. This exhaust hole 11c
Similarly, it is composed of a large number of small holes to prevent microwaves in the incinerator 2 from leaking to the outside. Further, in the heat exchange inlet duct 20, a heater 14 and a deodorizer 15 are arranged in the vicinity of the exhaust hole 11c, whereby the incinerator 2
We try to remove the offensive odor of the garbage that is incinerated inside.

The other end of the heat exchange inlet duct 20 is connected to the heat exchange outlet duct 21 via the heat exchanger 16. The heat exchange outlet duct 21 is bent in the middle and extends from the outer box 1 to the outside of the kitchen waste incinerator as an exhaust duct 26, and an exhaust fan 22 is disposed at the exhaust duct 26 and the bent portion. The fan 22 is rotatably driven by a motor 24 arranged below.

Further, in the heat exchanger 16, a suction duct 18 and a heat exchange outlet suction duct 19 are arranged so as to be orthogonal to the heat exchange inlet duct 20 and the heat exchange outlet duct 21, and the suction duct 18
Sucks the outside air from the air suction hole 17 opened in the outer box 1, and sends this air to the heat exchange outlet suction duct 19 via the heat exchanger 16. Also, the heat exchange outlet intake duct
Numeral 19 extends downward and is connected to an internal air intake hole 28, and the air thus fed is supplied from the internal air intake hole 28 to a gap 29 around the incinerator 2 through a lower part of the incinerator 2, and from this gap 29. It is sent to the incinerator 2 through the intake hole 12.

The heat exchanger 16 is connected to the incinerator 2 via the heat exchange inlet duct 20.
Converts the exhaust gas from high temperature to low temperature, heat exchange outlet duct
At the same time as being discharged to the outside by the action of the fan 22 via the 21 and the exhaust duct 26, the outside air sucked from the air suction hole 17 is converted into warm air, and the heat exchange outlet suction duct 19, the internal suction hole 28, and the gap 29. Also, the gas is supplied into the incinerator 2 through the intake holes 12, thereby promoting combustion in the incinerator 2.

Further, an upper lid 5 is attached to the upper opening of the outer box 1, and the upper lid 5 can be opened and closed by a hinge 6 attached to one end. A lock member 30 is attached to the other end of the upper lid 5.
The bent hook 30a at the lower end of the
By engaging with 1, the upper lid 5 can be locked so as not to open. Outer box 1
A handle 27 is attached below the outer wall of the
Further, a choke 4 is provided inside the lower corner.

An upper plate 5a made of porcelain or the like is attached to the lower surface of the upper lid 5 facing the opening of the incinerator 2, and a heat insulating material 5b is provided between the upper plate 5a and the upper lid 5. . A choke structure 5c is provided around the upper plate 5a to prevent microwaves in the incinerator 2 from leaking from the upper lid 5 to the outside.

Further, in FIG. 2 (a), a microwave supply opening 8a is formed in the upper middle part of the incinerator 2 as shown by a dotted line, and this opening 8a is shown in FIG. 2 (b). As can be seen from the above, it is connected to the magnetron 9 via the waveguide 8 and the microwave from the magnetron 9 is transmitted to the inside of the incinerator 2 via the waveguide 8 and the opening 8a. In addition,
The magnetron 9 is connected via a lead wire 33 to a power supply unit 32 provided below the kitchen incinerator, and is operated by an AC voltage supplied from the power supply unit 32.

The operation of the kitchen refuse incinerator having the above-described configuration will be described below.

First, in using the present apparatus, the lock member 30 is removed, the upper lid 5 is opened, the kitchen for incinerating raw garbage and the like is put into the incinerator 2, and then the upper lid 5 is completely closed to lock the lock member. Lock 30 over the recess 31 of the outer box 1.

Next, for example, a power switch (not shown) or the like is turned on to operate the kitchen waste incinerator. As a result, the AC voltage from the input power terminal 49 is supplied to the magnetron 9 via the power switch 47, and the incinerator 2 generates high frequency radio waves, that is, microwaves. This microwave is transmitted to the inside of the incinerator 2 through the waveguide 8 and high-frequency heats the garbage such as garbage thrown into the incinerator 2.

In this way, as soon as the magnetron 9 starts operating,
The voltage is also supplied to the motor 24, and the fan 22 provided in the exhaust duct 26 also rotates. As a result, the exhaust gas in the incinerator 2 is exhausted to the outside through the exhaust hole 13, the heat exchange inlet duct 20, the heat exchanger 16, the heat exchange outlet duct 21 and the exhaust duct 26. At this time, the temperature of the exhaust gas discharged from the exhaust duct 26 is detected by the temperature sensor 25, supplied to the temperature detection circuit 41, and compared with a predetermined set temperature in the temperature detection circuit 41. And immediately after the start of operation of this kitchen refuse incinerator,
When the temperature of the exhaust gas, that is, the temperature in the incinerator 2 is equal to or lower than the predetermined set temperature, the reset signal is not output from the temperature detection circuit 41 to the timer counter 43, so the timer counter 43 continues the counting operation. are doing.

In addition, the kitchen waste such as garbage in the incinerator 2 is magnetron 9
When heated by microwaves from the incinerator 2
The inside of the building gradually becomes higher.

FIG. 3 is a temperature characteristic diagram showing a temperature change in the incinerator 2 in this case with respect to time. In this figure, the temperature is taken in the vertical direction, and the alternate long and short dash line represents the room temperature Tr of the room in which the kitchen waste incinerator is installed.
Represents Ts. In the figure, the temperature in the incinerator 2 which was room temperature Tr at the initial time t ₀ rises with the first time, exceeds the set temperature Ts in a relatively short time, and then
The temperature is almost constant until t ₁ . The period up to time t ₁ is a period in which the garbage and the like are not sufficiently heated by the high frequency heating operation by the microwave, and the molecules constituting the garbage and the like are stirred by the high frequency. When the elapsed time t _1, the high-frequency heating is rapidly increased to begin as shown at time t ₁ proceeds rapidly to t ₂ by microwave for garbage or the like, reaches a peak at time t _2. When the temperature reaches the peak, it starts to drop rapidly, falls below the set temperature Ts, and further drops to room temperature Tr.

When high-frequency heating by microwaves is started, the inside of the incinerator 2 operates in such a temperature cycle, but the temperature sensor 25 and the temperature detection circuit 41 operate at the temperature in the incinerator 2 in such a temperature cycle. Is monitored by the temperature of the exhaust gas from the exhaust duct 26, and when the temperature exceeds a predetermined set temperature Ts, the temperature detection circuit 41 outputs a reset signal and resets the timer counter 43. That is, in the temperature characteristic diagram shown in FIG. 3, the predetermined time TH1 at which the above-mentioned timer counter 43 overflows is shown from the time t _0, but the temperature in the incinerator 2 shown by the solid line is the start time t _0. After a short time, the temperature inside the incinerator 2 exceeds the set temperature Ts, at which point a reset signal is output from the temperature detection circuit 41 and the timer counter 43 is reset. The time when the set temperature Ts is exceeded is within the range of the predetermined time TH1 and the time when the overflow signal is not yet output from the timer counter 43.

Therefore, the magnetron 9 continues to operate without being stopped by the power supply control circuit 45. Therefore, the garbage and the like in the incinerator 2 are heated by the microwave from the magnetron 9, and the temperature in the incinerator 2 changes according to the characteristics shown in FIG. Then, when time t ₁ is reached, the temperature inside the incinerator 2 rises sharply, the internal garbage, etc. ignites from the heated state and is incinerated, the internal temperature reaches its peak at time t ₂ , and the incineration is almost completed. However, the internal temperature is the third
As shown in the characteristics of the figure, it sharply decreases toward times t ₃ and t ₄ .

When the internal temperature is equal to or higher than the predetermined set temperature Ts, the timer counter 43 is always reset by the reset signal output from the temperature detection circuit 41, but as described above, the incineration operation ends, When the internal temperature starts to drop and becomes equal to or lower than the set temperature Ts, the temperature detection circuit 41 does not output the reset signal again, so the timer counter 43 starts the counting operation again. In FIG. 3, at time t ₃ , the internal temperature becomes equal to or lower than the set temperature Ts, and at time t ₄ , the internal temperature becomes room temperature Tr, so that the timer counter 43 starts counting operation from time t ₃ . As a result, the predetermined time TH
When 1 has passed, the timer counter 43 outputs an overflow signal. This overflow signal controls the power supply switch 47 to open via the power supply control circuit 45, whereby the supply of operating power to the magnetron 9 is stopped and the incineration operation is completed.

By the way, even when the incinerator 2 is operated without putting garbage such as garbage into the incinerator 2 and the incineration operation is started, there is nothing microwave-heated by microwaves, that is, high-frequency heating is not performed. The temperature in the incinerator 2 does not become high because there is nothing that is generated by agitation of molecules that make up an insulator such as dust and is heated to a high temperature, whereas there is nothing that is heated by high frequency such as raw dust. It remains at a low temperature, that is, remains below the set temperature Ts. Therefore, since the low temperature lower than the set temperature Ts is detected by the temperature detection circuit 41 via the temperature sensor 25, the reset signal is not output from the temperature detection circuit 41, and the timer counter 43 continues the counting operation. This counting operation is continued while the temperature inside the incinerator 2 is low, but when the predetermined time TH1 has elapsed, the timer counter 43 outputs an overflow signal, and the overflow signal causes the power control circuit 45 and the power switch 47 to operate. Through this, the supply of operating power to the magnetron 9 is stopped. Therefore, the magnetron 9 itself does not receive microwaves generated by itself and reflected by the inner wall of the incinerator 2 for a long time, so that its life is not reduced and the power supply to the magnetron 9 is stopped. Economical and safe.

FIG. 4 is a block diagram showing a circuit configuration of another embodiment of the present invention. This embodiment is different from the embodiment of FIG. 1 in that a latch 51 for holding temperature data output from the temperature detection circuit 41, a second temperature detection circuit 53 connected to the latch 51, and a latch 51. And a second timer counter reset by a reset signal from the second temperature detection circuit 53
55 and. The operation of this embodiment, as shown in the temperature characteristic diagram of FIG. 5, detects the temperature change at the time of starting the operation of the device by the first temperature monitoring unit including the first temperature detection circuit 41 and the timer counter 43, A second temperature monitoring unit including a latch 51, a second temperature detection circuit 53, and a second timer counter 55 monitors the temperature change at the end of incineration.

Then, the first temperature monitoring unit detects whether or not the temperature Tf in the incinerator 2 at the time of starting the operation of the kitchen incinerator of the present embodiment has reached the first set temperature Ts1 shown in FIG. When the furnace temperature Tf does not reach the first set temperature Ts1 within the predetermined time TH1, the timer counter 43 outputs an overflow signal, and the power supply control circuit 45 and the power supply switch 47 are controlled by this overflow signal. As described above, the supply of operating voltage to the magnetron 9 is stopped.

In addition, the second temperature monitoring unit uses the temperature data supplied from the first temperature detection circuit 41, that is, the temperature Tf in the incinerator 2.
Is held in the latch 51, and the furnace temperature Tf of the second temperature detection circuit
In 53, it is compared with the second set temperature Ts2. When the in-furnace temperature Tf becomes equal to or lower than the second set temperature Ts2, the supply of the reset signal to the second timer counter 55 is stopped, whereby the second timer counter 55 starts the counting operation. The second timer counter 55 has a predetermined time TH2.
Counting, the overflow signal is output, and the power supply control circuit 45 and the power supply switchgear are output by the overflow signal.
47 is controlled, the supply of operating voltage to the magnetron 9 is stopped, and the incineration operation is completed.

The second timer counter 55 outputs the overflow signal after counting the predetermined time TH2, and after confirming that the furnace temperature Tf is the predetermined time TH2 or less during the predetermined time TH2, the magnetron Although the operation of 9 is stopped, if the second set temperature Ts2 is set low, the predetermined time TH2 may be zero. Also, the predetermined time T
H2 may be set higher than the predetermined axis-to-axis TH1. In this case, the second temperature detection circuit 53 may be activated once the temperature inside the furnace becomes high. .

FIG. 6 is a block diagram showing a circuit configuration of another embodiment of the present invention. This embodiment is, in addition to the embodiment of FIG. 1, connected to a latch 51 for holding temperature data output from a temperature detection circuit 41 and an output of the temperature sensor 25, and detects a temperature detected by the temperature sensor 25. The output signal from the latch 51 is connected to the reset terminal while detecting the negative gradient of the detected temperature by monitoring the temperature, and when the furnace temperature becomes equal to or higher than the predetermined set temperature Ts, the temperature detection circuit 41 and the latch. Temperature gradient detection circuit reset under the control of 51
61, a latch 63 connected to the output of the temperature gradient detection circuit 61, and a second timer counter 65 reset by a reset signal from the latches 51 and 63.

In the operation of this embodiment, as shown in the temperature characteristic diagram of FIG. 7, the first temperature monitoring unit consisting of the first temperature detection circuit 41 and the timer counter 43 changes the temperature at the start of the operation of the device for a predetermined time TH1. It monitors and detects that the temperature in the furnace rises above the preset temperature Ts within the preset time TH1, and the latch 5
1. A negative temperature gradient at the end of combustion, that is, a time t _{2 as} shown in FIG. 7, by a second temperature gradient monitoring unit including a temperature gradient detection circuit 61, a second latch 63, and a second timer counter 65. When the negative temperature gradient ΔT / Δt after the peak is reached is detected and it is detected that the negative temperature gradient is equal to or higher than a predetermined gradient, this data is supplied to the second latch 63, and the The second timer counter 65 is activated, the second timer counter 65 monitors the elapse of the second predetermined time TM2, and after this second predetermined time TH2, the second timer counter 65 outputs an overflow signal. Power control circuit 45
The supply of the operating voltage to the magnetron 9 is stopped by the control of the power switch 47. That is, in such a configuration, the first temperature monitoring unit consisting of the temperature detection circuit 41 and the timer counter 43 is the same as the configuration of FIG. 4, and monitors the change in the furnace temperature during the operation of the apparatus, The second temperature gradient monitoring unit detects the end of combustion, like the second temperature monitoring unit shown in FIG.

In each of the above-mentioned examples, the temperature inside the furnace is compared with a predetermined set temperature Ts, Ts1 or Ts2, but each of these set temperatures selectively determines an appropriate value as a result of various experiments. Alternatively, accurate control can be performed by using, for example, the outside air temperature, that is, a value obtained by adding a predetermined value to the room temperature Tr.

Further, in each of the above-described embodiments, an example in which each circuit such as a temperature detection circuit, a timer counter, and a temperature gradient detection circuit is individually configured in a circuit is described, but the function of each of these circuits is as follows. Not only the method but also the software can be easily configured by using, for example, a microcomputer.

FIG. 8 is a flow chart showing the operation of still another embodiment of the present invention in which the garbage incinerator shown in FIG. 6 is constructed by software using a microcomputer as described above.

In the figure, first, the room temperature Tr is detected, and this room temperature Tr is detected.
The set temperature Ts is detected by adding a constant temperature to and the set temperature Ts is stored (steps 110 and 120). then,
Exhaust temperature Tf from the incinerator 2 detected by the temperature sensor 25
Is compared with the set temperature Ts (step 130), and while the exhaust temperature Tf is lower than the set temperature Ts, a count-up operation is performed by the soft counter, and when the time count exceeds (steps 140, 150), the equipment such as the magnetron 9 is That is, the supply of the operating voltage is stopped so that each device is stopped and the incinerator 2 is prevented from being boiled. (Step 200).

On the other hand, if the exhaust temperature Tf becomes higher than the set temperature Ts before the soft counter counts over, the temperature gradient of the exhaust temperature Tf is calculated, and it is determined whether or not this temperature gradient is larger than a predetermined negative set value. (Steps 160 and 170).

Then, when the calculated temperature gradient becomes larger than a predetermined negative set value, a count-up operation is performed by the soft counter, and when the count is over (step 18
(0,190), the supply of the operating voltage to the equipment such as the magnetron 9 is stopped, whereby each equipment is stopped and the combustion operation is stopped (step 200).

FIG. 9 is a characteristic diagram showing the temperature change in the incinerator of the kitchen refuse incinerator, as in FIGS. 3, 5, and 7, and the like. In addition to the temperature, other set temperature values include a set temperature Tsh that is a relatively high temperature after time t ₁ and a set temperature that is lower than this set temperature Tsh.
Tss is set. And such set temperature Tsh
And when the set temperature Tss is set, and then the set temperature Tsh which is lower than this temperature is detected after first detecting the set temperature Tsh which is higher than this temperature, the operation voltage supply to the magnetron 9 is stopped. Is. This is a modification of the above-described embodiment that detects a negative temperature gradient, and can be configured in this way.

In each of the above-described embodiments, the temperature inside the incinerator 2 is detected by detecting the exhaust gas temperature from the exhaust duct 26 by the temperature sensor 25 provided in the exhaust duct 26. The temperature in 2 may be directly detected.

Further, in each of the embodiments, the temperature may be detected, and the operation of the kitchen waste incinerator may be controlled by this temperature, or the humidity may be detected instead of the temperature, and the temperature may be controlled by a change in the humidity. That is, since garbage such as kitchen garbage generally contains a considerable amount of water, the humidity in the incinerator 2 is considerably high at the start of the incinerator operation, and the incinerator operation in the incinerator 2 starts. However, as incineration begins, the water content such as raw garbage will decrease and the humidity in the incinerator 2 will also decrease. The humidity variation characteristic is such that the humidity of the is almost zero. Therefore, at the time of starting the operation of the device, by detecting that the humidity is high, it is detected that kitchen refuse such as garbage is contained in the incinerator 2 to prevent the empty heating, and the end of the combustion operation. Time can be detected because the humidity is almost gone.

That is, the present invention is not limited to the temperature and the like, and is achieved by detecting the incineration state in the incinerator 2 including the humidity and the like, the state of the garbage incinerator, and the like, whereby the empty heating of the incinerator 2 is achieved. And the end of the incineration operation is accurately detected. More specifically, the temperature,
Not limited to the humidity, by detecting whether or not garbage such as garbage is contained in the incinerator 2, it is possible to control each of the above-mentioned operations, that is, the operations such as the prevention of empty heating and the detection of the end of incineration. is there. Then, as specific means for detecting whether or not the kitchen waste is contained in the incinerator 2 as described above, other than detection of changes in temperature, humidity, etc., for example, detection of the weight in the incinerator 2, that is, raw garbage And so on. In this case, a means for detecting that the weight is heavy, but the weight becomes lighter when it is not contained or is incinerated, or a photo interrupter or the like is attached to the incinerator 2, whereby an optical incinerator is optically installed. There is an optical means or the like for detecting whether or not raw garbage is contained in 2.

[Effects of the Invention] As described above, according to the present invention, the incineration state in the incinerator is detected, and when the detected state is not in the predetermined state, the incineration operation in the incinerator is stopped. ,
That is, specifically, for example, the temperature or humidity in the incinerator is detected, and when the state where the temperature or humidity is equal to or lower than a predetermined value continues for a predetermined time or more, since the incineration operation is stopped, raw garbage, etc. When not in the incinerator,
Even when the power of the device is turned on, the magnetron power supply is stopped after a predetermined time, for example, so that the magnetron continues to operate in the no-load state where there is no garbage or ash, and the magnetron continues to operate. Microwaves generated by the magnetron will not deteriorate the life of the magnetron itself, prevent wasteful power consumption, improve economic efficiency and safety, and also accurately detect the end of incineration. Therefore, power saving and safety can be obtained in this respect as well.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a kitchen incinerator according to an embodiment of the present invention, FIG. 2 is a sectional view showing a structure of the kitchen incinerator of FIG. 1, and FIG. 3 is a kitchen of FIG. FIG. 4 is a characteristic diagram showing the temperature characteristic of the incinerator, FIG. 4 is a block diagram showing the circuit configuration of another embodiment of the present invention, FIG. 5 is a characteristic diagram showing the temperature characteristic of the garbage incinerator of FIG. 4, and FIG. FIG. 7 is a block diagram showing a circuit configuration of another embodiment of the present invention, FIG. 7 is a characteristic diagram showing temperature characteristics of the kitchen refuse incinerator of FIG. 6, and FIG. 8 is an operation of still another embodiment of the present invention. FIG. 9 is a characteristic diagram showing temperature characteristics used in still another embodiment of the present invention. 2 …… Incinerator 9 …… Magntron 25 …… Temperature sensor 41 …… Temperature detection circuit 43 …… Timer counter 45 …… Power control circuit 61 …… Temperature gradient detection circuit

Front page continuation (72) Fumihiro Imamura, 4-21, Yoshihara-cho, Nishi-ku, Nagoya City, Toshiba Corporation Nagoya factory (72) Inventor, Kiyomi Niwa, 4--21, Yoshihara-cho, Nishi-ku, Nagoya City, Toshiba Corporation, Nagoya factory (72) ) Inventor Tsuneo Hibi 4-21 21-chome, Yoshihara-cho, Nishi-ku, Nagoya-shi Toshiba Corporation Nagoya factory (56) References JP-A-60-140013 (JP, A) JP-A-61-70315 (JP, A)

Claims (6)

(57) [Claims] 1. A kitchen incinerator for radiating a high frequency and incinerating the kitchen waste to be incinerated contained in the incinerator, wherein the kitchen incinerator has no kitchen to be incinerated and should be incinerated. No-load detection means for detecting both no-load states in the incinerator when the garbage has been incinerated, and when the no-load state is detected by this no-load detection means, high frequency radiation to the incinerator is stopped. A garbage incinerator, comprising: 2. The kitchen incinerator according to claim 1, wherein the no-load detecting means detects the no-load state based on a temperature change or a humidity change in the incinerator. 3. The no-load detection means detects that the kitchen to be incinerated does not exist in the incinerator, and detects that the temperature in the incinerator is below a predetermined temperature for a predetermined time or more. The garbage incinerator according to claim 2, characterized in that 4. The no-load detecting means detects the state in which the garbage to be incinerated has been incinerated by detecting a negative temperature gradient in which the temperature in the incinerator changes from a high temperature to a low temperature. The garbage incinerator according to claim 2. 5. The no-load detecting means detects that the kitchen waste to be incinerated does not exist in the incinerator and that the humidity in the incinerator is below a predetermined humidity for a predetermined time or more. The garbage incinerator according to claim 2, characterized in that 6. The no-load detecting means detects whether the kitchen to be incinerated has finished incineration by detecting a negative humidity gradient in which the humidity in the incinerator changes from high humidity to low humidity. The kitchen incinerator according to claim 2 characterized by the above.