JPH0116939Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in an evaporative stove that distinguishes between preheating and combustion.

[Technical background of the invention and its problems]

In principle, heating and vaporizing stoves have a vaporizer in the oil supply path to vaporize fuel, and when the vaporizer is preheated and reaches a predetermined temperature, fuel is supplied and ignited. The time required to preheat the carburetor, that is, the time from the initial stage of preheating to ignition, is called preheating time.

By the way, in the case of conventional stoves of this kind, various methods have been considered regarding the mode of displaying the operation of the stove. One of them is that some stoves are equipped with an operation lamp, but the lighting of this stove operation lamp indicates that the vaporizer is preheating.
Or, it was not possible to distinguish and display whether the fire was being extinguished. In addition, there is another type that uses an operation lamp to distinguish between preheating and combustion. The display form of this operation lamp is as follows.
It is displayed by flashing during preheating and by continuous lighting during combustion, but in this case it is not possible to determine to what extent the carburetor has been preheated. Therefore, it was practically impossible to tell whether the carburetor was warming up or not at all. Moreover, if the preheating display continues to flash for a long time due to the operation lamp,
This has also caused users to worry that the vaporizer is not heating up at all, or that the vaporizer is heating up excessively and is in a dangerous state.

[Purpose of invention]

The present invention was developed with a focus on the above points, and in addition to distinguishing between preheating and combustion, it also allows the degree of preheating to be displayed during preheating, and the room temperature to be displayed during combustion. To provide a vaporizing stove which allows a user to use the stove with a greater sense of security by making it possible to accurately grasp the operating state of the stove.

[Summary of the idea]

The present invention provides a first switch group that takes in a vaporizer temperature signal caused by preheating and a plurality of vaporizer reference temperature signals in a vaporizing stove that performs combustion by ignition when the vaporizer reaches a predetermined temperature due to preheating. When the vaporizer temperature exceeds a certain temperature, the first
It has a second switch group that turns on and takes in an indoor temperature signal and a plurality of indoor reference temperature signals, contrary to the off operation of the switch group, and the first switch group takes in the indoor temperature signal and a plurality of indoor reference temperature signals when preheating the vaporizer. The vaporizer temperature and a plurality of vaporizer reference temperature signals are individually compared using a plurality of comparators, and the number of light emitters is turned on according to the degree of preheating. In the vaporizing stove, the indoor temperature signal and the plurality of indoor reference temperature signals are compared by the plurality of comparators, and the current indoor temperature is displayed by one light emitting element among the plurality of light emitting elements according to the indoor temperature. be.

[Example of idea]

Hereinafter, an embodiment of the display system of the vaporizing stove according to the present invention will be described with reference to FIG. 1. The display system of this vaporizing stove consists of a vaporizer temperature detection circuit 1 that detects the temperature of the vaporizer, and a switch control that uses the vaporizer temperature signal detected by this circuit 1 to generate a switch opening/closing control signal. The circuit 2, the indoor temperature detection circuit 3, and the switch control circuit 2 perform contradictory operations in response to the switch opening/closing control signals outputted from the switch control circuit 2 to generate a vaporizer temperature signal, a vaporizer reference temperature signal, and an indoor temperature signal. and a group of switches 4 that take in indoor reference temperature signals; a group of comparators 5 that compares the temperature signals from the detection circuits 1 and 3 with the reference temperature signals; and a display section 6 made of a plurality of light emitters. .

In the vaporizer temperature detection circuit 1, a vaporizer temperature sensor 11 such as a negative characteristic thermistor is attached to a vaporizer (not shown), and a power supply V _cc is supplied to one end of the sensor 11 via a resistor 12. is,
The other end is grounded. Then, when the temperature of the vaporizer rises due to heating by the heater, the resistance value of the vaporizer temperature sensor 11 decreases, and the vaporizer temperature detection circuit 1 detects the vaporizer temperature from the connection point between the vaporizer temperature sensor 11 and the resistor 12. A vaporizer temperature signal is output whose voltage level gradually decreases as the temperature increases.

The switch control circuit 2 includes a resistor 21 that outputs a carburetor reference temperature signal having a voltage that determines the switching timing from preheating to ignition combustion of the carburetor;
22, the positive side input terminal is connected to the output terminal of the resistive voltage dividing circuit, and the negative side input terminal is connected to the output terminal of the vaporizer temperature detection circuit 1. is a comparator 23 which outputs a low level signal "L" and a high level signal "H" when the temperature of the carburetor reaches a predetermined temperature or higher during combustion due to ignition, and an inverter 24 which inverts the output of this comparator 23. , and a resistor 25 for applying a required bias between the inverter 24 and the comparator 23.

Next, the indoor temperature detection circuit 3 has an indoor temperature sensor 31 such as a thermistor, and one end of this sensor 31 is supplied with a power supply _Vcc via a resistor 32, and the other end is grounded. A current indoor temperature signal is output from the connection between the sensor 31 and the resistor 32.

The switch group 4 includes the inverter 2
The first analog switch group C1 is turned on by the high-level switch close control signal output from C4.
0 to C31, E10 to E30, and a second analog switch group D10 to D31, F10 to F30, which are turned on by a high level switch closing control signal output from the comparator 23. That is, this first analog switch group C1
0 to C31, E10 to E30 and the second analog switch group D10 to D31, F10 to F30 are controlled by signals of different levels outputted from the switch control circuit 2, so that when one is in the on operation, the other is in the off operation. , conversely, when one is in the OFF operation, the other is controlled in the ON operation. More specifically, the first analog switch group C10 to C3
1. The controlled end of E10 to E30 is the inverter 24
The controlled ends of the second analog switch group D10 to D31 and F10 to F30 are commonly connected to the output end of the comparator 23. Further, among these analog switches, one end of the switch C31 is connected to the output end of the vaporizer temperature detection circuit 1, and one end of the switch D31 is connected to the output end of the indoor temperature detection circuit 3. Furthermore, first analog switch groups C10 to C31,
Among E10 to E30, one end of C10 to C30 is input with a vaporizer reference temperature signal A10 to A30 having a voltage corresponding to the vaporizer temperature T ₁₀ °C to T ₃₀ °C. The sides are commonly grounded. Moreover, indoor reference temperature signals B10 to B31, which serve as a reference for the temperature signal of the indoor temperature sensor 31, are supplied to one end side of the second analog switch group D10 to D30, F10 to F30. It is assumed that B10 to B29, B30, and B31 are voltage signals corresponding to reference temperatures of 9.5°C to 28.5°C, 29.5°C, and 30.5°C. Then, each pair of switches C10, D10 to C31, D31, E10,
The other ends of F10 to E30 and F30 are commonly connected to the comparator group 5 for each pair.

This comparator group 5 consists of a plurality of comparators G10 to G30 and H10 to H30, and among these comparators, the negative input terminals of G10 to G30 and the positive input terminals of H10 to H30 are connected to the other terminals of the switches C31 and D31. The positive side input terminals of comparators G10 to G30 are connected to switches C10, D10 to C30, and D3, respectively.
The negative input terminals of the comparators H10 to H30 are connected to the common parts of the switches E10 and F10 to E30 to F30, respectively. The output ends of these comparators G10, H10 to G30, H30 are commonly connected and introduced into the display section 6.

This display section 6 includes comparators G10 and H10.
~Resistance R10 at the output terminal of G30 and H30 respectively
~Drive transistor TR10 via R30~
The base of TR30 is connected, and a light emitting body T10 to T30 such as a light emitting diode is connected to the collector side of these driving transistors TR10 to TR30.
is connected. Drive transistor TR10
~The emitter side of TR30 is grounded. R
1 and R2 are bias resistors.

Next, the operation of the vaporizing stove configured as above will be explained. As the vaporizer temperature gradually increases due to preheating of the vaporizer, the resistance value of the vaporizer temperature sensor 11 gradually decreases, and accordingly, the vaporizer temperature signal from the vaporizer temperature detection circuit 1 is sent to the comparator. 23 and one end of switch C31. At this time, if the carburetor temperature _T , this signal causes the first analog switch group C10 to C31, E10 to E
30 is turned on. As a result, the vaporizer temperature signal is transmitted to each comparator G10 through switch C31.
Negative input terminal of G30 and each comparator H10
~H30 are respectively supplied to the positive input terminals. In addition, other switches C10 to C3 that are turned on
0 are input with vaporizer reference temperature signals A10 to A30 having voltages corresponding to the reference temperatures _T10 to _T30C of the vaporizer, and are supplied to the positive side input terminals of the comparators G10 to G30. Furthermore, a switch E1 is connected to the negative input terminals of the comparators H10 to H30.
A ground signal is input via 0 to E30.
In addition, the vaporizer reference temperature signal A3 corresponding to T ₃₀ °C
0 is slightly lower than the ignition point temperature _TST ,
Further, A10 to A30 may be at equal intervals in terms of temperature, but in this embodiment, they are not equal in terms of temperature but are set as temperature intervals that are approximately equal in terms of time during the preheating time.

Now, during preheating, the temperature signal _T
Assuming that T ₂₈ ℃ _{< T}
outputs a low level signal “L” since the vaporizer temperature signal _T
A high-level signal "H" is output from. In this case, the open collector type comparator G
Since the output terminals of G10 and H10 to G30 and H30 are connected in common, the comparator G10
The transistors TR10 to TR28 connected to the output ends of the transistors TR10 to TR28 are turned on, and the light emitters T10 to T28 corresponding to these transistors TR10 to TR28 are turned on. FIG. 2 shows the lighting state of the light emitters T10 to T28.

Furthermore, the vaporizer is heated by a heater,
When _{the vaporizer temperature T}
29 is also turned on, and only the light emitter T30 corresponding to 30° C. is not turned on. Furthermore, when the temperature T _{X of} the vaporizer increases to become T ₃₀ ° C.< _T

Then _, when _the vaporizer temperature _T 23 outputs a high level signal "H", while inverter 24 outputs a low level signal "L". As a result, the first analog switch group C10
~C31, E10~E30 are turned off, and the second analog switch group D10~D31, F10~F30
is controlled and operates. Therefore, the indoor temperature signal output from the indoor temperature detection circuit 31 is supplied to the negative input terminals of the comparators G10 to G30 and the positive input terminals of the comparators H10 to H30 of the comparator group 5 via the switch D31. On the other hand, these comparators G10 to G30
positive input terminal and comparators H10 to H30
The negative input terminal of the indoor reference temperature signal B10 to B30, which is a preset voltage value, is 9.5℃ to
An indoor reference temperature signal corresponding to 29.5°C is provided.

Now, if an indoor temperature signal of 29°C is output from the indoor temperature sensor 31, a low level signal "L" is output from the comparator G30, and a high level signal "H" is output from the other comparators G10 to G29. Ru. Also, high level signals "H" are output from H29 and H30 among the other comparators H10 to H30, and the other comparators H10 to H2
A low level signal "L" is output from each of the terminals 8 and 8. Therefore, these comparators G10 and H
Since the output terminals of 10 to G30 and H30 are connected in common, if one comparator outputs a high level signal "H" and the other comparator outputs a low level signal "L", it will go to low level. It can be suppressed. Therefore, the comparator G29, from which high level signals "H" are output,
Transistor connected to the output terminal of H29
Only TR29 turns on, and this transistor TR2
Only the light emitter T29 corresponding to 9 lights up. Fourth
The figure shows the lighting state of the light emitter T29.
Similarly, during combustion after ignition, one light emitter corresponding to the room temperature will be lit.

Therefore, according to the above configuration, when preheating the vaporizer, it is not only possible to know that preheating is in progress from the lighting state of the light emitters T10 to T30, but also from the number of lights of the light emitters T10 to T30. The progress of preheating can be seen at a glance. Also, during combustion, one light emitting element lights up in accordance with the indoor temperature, so it is possible to distinguish whether preheating or combustion is in progress based on the number of lights on this light emitting element, and it is also possible to display the indoor temperature. If it is old and there is no fire, you can tell what is wrong.
In addition, as the degree of preheating increases, the number of light emitters that turn on also increases, which not only shows that the vaporizer is actually being heated, but also that the vaporizer is being heated by the heater. However, if the number of light-emitting bodies does not gradually increase, it can be determined that there is a malfunction or abnormality in the vaporizer heater, that is, the heating element, or in the control. Furthermore, if all the light emitters T10 to T30 turn on from preheating to ignition, the number of lights lit indicates how far the preheating of the vaporizer has progressed or how long it will take to ignite. can be predicted.

Note that the present invention is not limited to the above embodiments. For example, although thermistors are used as the temperature sensors 11 and 31, other temperature sensor elements may be used as long as they have similar operating characteristics.
Further, although the voltage at the positive input terminal of the comparator 23 is obtained by a resistive voltage dividing circuit, it is not necessary to use a resistive voltage dividing circuit. The point is that the voltage may be a predetermined voltage, and a variable voltage may be used if necessary. Although analog switches are used for the switches C10 to C31, . . . in the switch group 4, various conventionally known analog switches can be applied thereto. Furthermore, the reference temperature signals A10 to A30, B10 to B30, etc. are not limited to the embodiments, and various reference temperature signals are used, and accordingly, the switches and comparators G10 to G30, H10 to H30 are The number will also increase or decrease. In addition, the light emitters T10 to T
30, all of the light emitting bodies are turned on before the transition from preheating to ignition, but it may be configured such that a plurality of light emitting bodies are not turned on at the stage of ignition.
In this case, the non-lighting light emitter is turned on when the room temperature becomes high. In addition, the present invention can be modified and implemented in various ways without departing from the gist thereof.

[Effect of idea]

As described in detail above, according to the present invention, the distinction between preheating and combustion can be recognized at a glance, the degree of preheating of the vaporizer can be determined from the number of lit light emitters, and during combustion You can know the indoor temperature from the light emitter that is lit. Therefore, it is possible to provide an evaporative stove that allows the user to accurately grasp the operating state of the stove from the lighting state of the display section.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention;
FIGS. 2 to 4 are diagrams explaining the operating state of the stove. DESCRIPTION OF SYMBOLS 1... Carburetor temperature detection circuit, 2... Switch control circuit, 3... Indoor temperature detection circuit, 4... Switch group, 5... Comparator group, 6... Display section, 1
1... Carburetor temperature sensor, 23... Comparator, 24... Inverter, 31... Indoor temperature sensor, C10-C31, D10-D31, E10-
E30, F10~F30...Switch, G10~
G30, H10~H30...Comparator, T1
0-T30... Luminous body.

Claims (1)

[Scope of utility model registration request] In a vaporizing stove that preheats a vaporizer by warming it with a heater and ignites when the vaporizer reaches a predetermined temperature, there is a vaporizer temperature detection circuit that detects the temperature of the vaporizer, and an output from this vaporizer temperature detection circuit. A switch control device that compares the vaporizer temperature signal and the ignition reference temperature signal corresponding to the predetermined temperature, and outputs a switch opening/closing control signal of a different level when the vaporizer temperature is lower than the ignition reference temperature and when it is higher than the ignition reference temperature. a circuit, an indoor temperature detection circuit that detects the indoor temperature, and first and second switch groups that perform mutually contradictory operations based on switch opening/closing control signals output from the switch control circuit, and are turned on during preheating. The vaporizer temperature signal and a plurality of vaporizer reference temperature signals are outputted through a first switch group, and an indoor temperature signal and a plurality of indoor reference temperature signals are outputted through a second switch group that is turned on during combustion. comparing the vaporizer temperature signal outputted by turning on the first switch group with a plurality of vaporizer reference temperature signals;
A plurality of comparators are provided corresponding to the output terminals of these comparators to compare the indoor temperature signal outputted by turning on the switch group with a plurality of indoor reference temperature signals, and the vaporizer is heated during preheating. A vaporizing stove characterized by comprising a plurality of light emitters that light up in number according to the degree of preheating, and light up one by one according to the room temperature during combustion.