JPS6123263Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention controls the room temperature based on room temperature information sent from a wireless room temperature sensor, and when the room temperature reaches an abnormally high temperature, the combustion engine is guided to extinguish the fire. Concerning improvements to hot air heaters.

In conventional combustion-type hot air heaters, such as kerosene stoves, the room temperature sensor that detects the room temperature is connected to the control system of the heater body with a lead wire or cord, and is not attached directly to the heater body. , the cord was extended and fixed to a specific location in the room that was to be heated. However, in the case where the room temperature sensor is attached directly to the heater body, the combustion heat is transmitted through the case of the heater body and has a considerable effect on the room temperature sensor, so there is a drawback that accurate room temperature sensing cannot be performed. In this regard, a room temperature sensor that is connected to the combustion control system by a cord and fixed at a specific location has the advantage of not being directly affected by combustion heat, but it requires specialized workers to install the cord. In addition, the area where the code can be laid is limited depending on the structure of the building, etc.
There is a risk that the sensor may be installed in an inappropriate location as a room temperature sensing location. Assuming that these defects have been removed, a transmitter is attached to the room temperature sensor,
A configuration is being considered in which the transmitter sends room temperature information as radio waves to the main body, where the main body receives the radio waves and controls combustion based on the received information. According to the so-called wireless room temperature sensing system having the above configuration, the room temperature sensor can be installed at any location, so it can be installed at the most appropriate location for room temperature sensing. However, in the above-mentioned wireless room temperature sensing method, the sensor can be moved and installed at any time by the user of the heater. In fact, there is a possibility that it may be moved and installed in a location that is not favorable for sensing room temperature. For example, a room temperature sensor may be installed in a location where it is directly exposed to hot air sent out from a heater. In such a case, the room temperature cannot be detected accurately, which naturally leads to inaccurate room temperature control, and the hot air heater is configured to automatically extinguish the fire in response to abnormal room temperature information from the room temperature sensor. average room temperature (temperature averaged from each point in the room)
Even though the level of combustion is low, the combustion will start to stop.

This idea was made taking these circumstances into consideration, and its purpose is to ensure that even when the wireless room temperature sensor detects an abnormally high temperature, there is an air flow with a wind speed above a predetermined level in the room to be heated. If it is, do not immediately stop combustion,
To provide a combustion type hot air heater capable of automatically extinguishing a combustion device and performing stable and safe combustion control only when there is almost no air flow.

The details of this invention will be clarified below with reference to embodiments shown in the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of this invention, where A is a wireless room temperature sensing section, and B is a combustion control section of the main body of a combustion type hot air heater.

The room temperature sensing part A is a surface acoustic wave oscillator (hereinafter referred to as SAW).
A room temperature sensor 1 consisting of an oscillator mainly composed of a device (abbreviated as );
and a transmitting antenna 2 that radiates the output into the air. The above SAW device is an oscillator whose oscillation frequency changes linearly depending on temperature.

The high frequency amplifier 4 in the combustion control section B amplifies the signal received by the receiving antenna 3 and supplies it to one input end of the mixing circuit 5. On the other hand, the local oscillator 6 is
It is designed to oscillate at the same frequency as the oscillation frequency of the SAW device at a predetermined room temperature, for example 60° C., and its oscillation output is supplied to the other input terminal of the mixing circuit 5. The mixing circuit 5 mixes the signal fs from the high frequency amplifier 4 and the signal fso from the local oscillator 6, and sends out a signal containing "undulations" caused by the difference in frequency between the two signals. The detection amplifier 7 detects and amplifies the output signal of the mixing circuit 5. The frequency divider 8 consists of a counter, divides the frequency of the signal detected and amplified by the detection amplifier 7, and sends it to the controller 9. The controller 9 has a built-in microcomputer, etc., and converts the signal from the frequency divider 8 into a temperature signal according to a program, and also issues predetermined control commands according to the situation in the room to be heated, as described later. issue.

By the way, the controller 9 includes an abnormality detector 10,
Signals are input from a room temperature setting device 11 and a wind speed detector 12, respectively. Abnormality detector 10
The temperature in the room to be heated is abnormally high (e.g.
35℃), it detects this and sends out an abnormal signal. The room temperature setting device 11 is used to set the temperature in the room, and provides a setting signal (reference signal) to the controller 9. Further, the wind speed detector 12 detects the degree of air flow in the room and sends out an output signal when the wind speed exceeds a certain level.

Figure 2 shows the above abnormality detector 10 and room temperature setting device 1.
1 is a diagram showing the internal configuration of a controller 9 that is operated by signals from a wind speed detector 12 and the frequency divider 8. In FIG. 2, 13 is a signal converter consisting of a counter or the like inside the microcomputer described above, which counts the output signal of the frequency divider 8 arriving at the terminal _T8 and converts it into a temperature signal signal _S0 . The AND gate 14 obtains the AND of the signal 1 obtained by inverting the polarity of the abnormal signal S ₁ from the abnormality detector ₁₀ arriving at the terminal T ₁₀ by the inverter 15 and the temperature signal S ₀ , and outputs the output signal S. ₂ is applied to the signal input terminal of the comparison/judgment circuit 16. A setting signal S ₃ from the room temperature setting device 11 arriving at a terminal T ₁₁ is applied to the reference input terminal of the comparison/judgment circuit 16 . Comparison/judgment circuit 16
When the signal S ₂ is smaller than the signal S ₃ , a high level signal is sent out, and when the signal S ₂ is larger than the signal S ₃ , a low level signal is sent out. Terminal Y is a terminal that, when the comparison/determination circuit 16 sends out a high level signal, sends out this signal as a strong combustion command or strong air blowing command. In addition, when the comparison/judgment circuit 16 sends out a low level signal, the terminal Z is
This terminal is used to invert the polarity of this signal using the inverter 17 to make it a high level signal, and to send this signal as a weak combustion command or a weak ventilation command.

On the other hand, another AND gate 18 is connected to the signal converter 13.
The temperature signal S ₀ from the terminal is abnormally large and the upper limit level detector 19 detects this and outputs the signal S ₄ and the terminal
The logical product of the signal S ₅ from the wind speed detector 12 arriving at T ₁₂ and the signal ₅ whose polarity is inverted by the inverter 20 is obtained. Terminal X is the above AND gate 18
When a high level signal is sent from the terminal
This is a terminal that sends out these signals as a combustion stop command when the abnormality signal _S1 from the abnormality detector 10 arrives at _T10 .

Thus, the commands sent from the output terminals X, Y, and Z of the controller 9 are given to the response section 20 as shown in FIG. The response unit 20 includes a relay circuit, a switch, etc. that drives an ignition device, a fuel supply valve, a convection fan that sends warm air into the room, a combustion fan, etc. based on commands from the controller 9, and controls the combustion state or This allows you to switch the air flow between strong and weak.

Next, the operation of the heater configured as described above will be explained. The local frequency so of the local oscillator 6 is
Frequency s60 of SAW device when room temperature is 60℃
℃ has been selected. Now, the temperature information (oscillation frequency) detected by the room temperature sensor 1 is radiated into the air as radio waves via the transmitting antenna 2, and these radio waves are introduced into the combustion control section B of the heater main body via the receiving antenna 3. Then, the signal with the oscillation frequency s is amplified by the high frequency amplifier 4. This amplified third
The signal shown in Figure 3b is transmitted to the mixing circuit 5 as shown in Figure 3b.
It is mixed with the signal from the local oscillator 6 shown in FIG. Then, as shown in Figure 3c, the frequency
A signal with "undulations" corresponding to the difference in frequency between the _s and _sp signals, _L = _s - _sp , is obtained. The above "undulation" is nothing but information indicating how much the detected frequency at the current room temperature deviates from the frequency when the room temperature is 60 degrees Celsius, that is, the temperature difference between the temperature of 60 degrees Celsius and the current room temperature. .
The above-mentioned "undulation" is detected and amplified by a detection amplifier 7, then divided by a frequency divider 8, and inputted to a controller 9. This signal is counted as the number of pulses within a certain period by a signal converter 13 inside the microcomputer, and the counted value is used as a temperature signal.
converted to S ₀ . This temperature signal S ₀ is applied to one input terminal of the AND gate 14 on the one hand.
At this time, if the abnormality signal _S1 from the abnormality detector 10 does not arrive, a high level signal is applied to the other input terminal of the AND gate 14. Therefore, in this case, the temperature signal S ₀ passes through the AND gate 14 and enters the signal input terminal of the comparison/judgment circuit 16 as the signal S ₂ . When the signal S ₂ is smaller than the setting signal S ₄ applied to the reference input terminal of the circuit 16, that is, when the room temperature is smaller than the setting level L ₀ as in the period shown in FIG. A high level signal is sent from the circuit 16. This signal is transmitted from the terminal Y to the electromagnetic valve in the response section 20,
It is sent as a strong combustion command and strong air blow command to the convection fan drive circuit, etc. Therefore, the combustor is in a strong combustion state and a strong air blowing state.

Further, when the temperature signal _S2 is larger than the setting signal _S3 , that is, when the room temperature is higher than the setting level _L0 as in the period shown in FIG. Ru. This signal is inverted to a high level signal by the inverter 17, and is applied from the terminal Z to the electromagnetic valve and convection fan drive circuit of the response section 20 as a weak combustion command and a weak blowing command. For this reason, the combustion machine is in a weak combustion state,
The air will be in a weak state.

The output signal of the signal converter 13, that is, the temperature signal
S ₀ is input to the upper limit level detector 19 on the other hand. Therefore, by installing the room temperature sensor 1 near the hot air outlet of the heater body,
When the temperature signal S ₀ becomes abnormally large and exceeds the upper limit level L ₁ as shown in period V in FIG. 4, the upper limit level detector 19 detects this and sends out a signal S ₄ .
This signal S ₄ is applied to one input terminal of AND gate 18 . At this time, if there is an air flow with a wind speed above a certain level in the room to be heated,
A signal S ₅ is fed into the controller 9 from the wind speed detector 12 . Therefore, a low level signal whose polarity has been inverted by an inverter 20 is applied to the other input terminal of the AND gate 18. Therefore, a low level signal is sent out from the AND gate 18, and no extinguishing command is sent out. In other words, when there is an air flow with a wind speed above a certain level in the room, even if the room temperature sensor 1 detects a growing high temperature, the fire will not be extinguished immediately and the combustion state will deteriorate. continue. However, if such an air flow does not exist in the room, a high level signal will be applied to the input terminal of the AND gate 18, so that the upper limit level detector 19 will send out the signal _S4 . Therefore, a high level signal is sent from the AND gate 18 and the combustion machine is guided to extinguish the fire.

By the way, if the room temperature becomes truly abnormally high, this abnormal temperature is detected by the abnormality detector 10 and an abnormality signal S ₁ is supplied to the controller 9. Then,
The abnormality signal _S1 is directly sent from the terminal X to the response section 20 as a fire extinguishing command. Therefore, the burner is immediately directed to extinguish the fire. Furthermore, with the arrival of the abnormal signal _S1 , the high level signal that had been applied to one input terminal of the AND gate 14 changes to a low level signal, so the signal _S2 that was being supplied to the comparison judgment circuit 16 is cut off. It will be done.

Note that this invention is not limited to the embodiments described above. For example, in the above embodiment, the room temperature sensor 1 includes a SAW device,
In line with this, we have shown an example of a circuit in which a temperature signal is obtained by detecting frequency changes in the receiving system, but the room temperature sensor is a combination of a temperature-sensitive resistance element and a transmitter. It may also be a temperature signal forming circuit for the sensor. Furthermore, in the above embodiment, the fire is extinguished immediately when the room temperature becomes truly abnormally high; however, even when the room temperature truly becomes abnormally high, wind speeds exceeding a predetermined level can be detected. It may be configured such that fire extinguishing does not take place under certain circumstances. Of course, various other modifications can be made without changing the gist of the invention.

As explained above, according to this invention, a wind speed detector detects whether or not there is an air flow having a wind speed of a predetermined level or higher in a room to be heated;
The configuration is configured to determine whether or not to execute a fire extinguishing operation when an abnormally high temperature is detected in the room temperature, depending on the presence or absence of the above air flow, so even if the temperature information from the wireless room temperature sensor is incorrect because the sensor is installed at an inappropriate location. Even if the temperature reaches an abnormally high temperature, the combustor will not be extinguished if there is an air flow with a wind speed higher than the specified level in the room, and there is no air flow with the wind speed higher than the specified level. Only then will combustion equipment be brought in to extinguish the fire. Therefore, even if the wireless room temperature sensor is installed in a location that is unfavorable for detecting room temperature, such as a hot air outlet, the fire extinguishing action will not be performed immediately, and combustion control will be stable, and the air flow will be If there is no such situation, combustion will stop immediately.
It is possible to provide a combustion type hot air heater that is also highly safe.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of one embodiment of this invention, FIG. 2 is a diagram showing an example of the internal configuration of a controller of the same embodiment, and FIGS. FIG. 3 is a waveform diagram for explaining an example operation. A... Room temperature sensing section, B... Combustion control section, 1...
Room temperature sensor, 2... Transmitting antenna, 3... Receiving antenna, 9... Controller, 12... Wind speed detector, 1
6... Comparison/judgment circuit, 19... Upper limit level detector.

Claims (1)

[Scope of utility model registration request] A heater body, a wireless room temperature sensor installed at a predetermined location in the room heated by this body and transmitting room temperature information to the body by radio waves, and a wireless room temperature sensor that receives radio waves arriving from the room temperature sensor to obtain a temperature signal. a temperature signal forming circuit provided in the heater main body; a means for controlling the combustion amount, air blowing amount, etc. of the combustor based on the temperature signal sent from the temperature signal forming circuit; a wind speed detector that sends out a signal when there is an air flow with a wind speed above a predetermined level in a room; and a wind speed detector that sends out a signal when there is no output signal from the wind speed detector and at least the temperature signal exceeds an upper limit level indicating abnormally high temperature. 1. A combustion hot air heater characterized by comprising a means for extinguishing a fire in a combustion machine.