JPH0629670B2 - Control device for hot air heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a combustor that varies the combustion amount and the blown air amount of a blower according to room temperature.

2. Description of the Related Art A warm air heater, which is generally called an automatic temperature control type, compares the room temperature detected by a built-in room temperature detector with the set temperature, and automatically switches the combustion amount according to the comparison difference to adjust the temperature. It has become. And this kind of heater blows heated air into the room with a blower, and when the room temperature is low, the combustion amount is increased and at the same time the blown air amount is set to a strong air amount to send warm air to a long distance and the room temperature is high. Then, the room temperature is controlled by lowering the amount of combustion and the amount of air flow. Specifically, the change of the blown air amount is performed by changing the rotation speed of the blower, and conventionally, the change of the blown air amount is changed simultaneously with the change of the combustion amount. Therefore, the user only needs to set the set temperature, and then the device automatically determines the combustion amount, raises the room temperature to the set temperature, and maintains the room temperature at that temperature.

FIG. 6 is a schematic diagram showing a conventional combustion configuration. Reference numeral 101 denotes a fuel tank, and fuel oil is sucked up by an electromagnetic pump 102 and sent under pressure to a vaporizer 103. The vaporizer 103 is heated by the heat of combustion and the electric heating element 104,
The fuel oil is vaporized here, and the mixing pipe 106 is discharged from the nozzle 105.
The primary air is sucked by the ejector action due to the ejection force, ejected from the flame port 107, and burned there. The combustion heat is sent to the outlet A by the blower 108, and is sent to the room from here. Further, the room temperature detector 109 is the blower 1
It is attached near the suction port of 08.

FIG. 7 shows a conventional control circuit, in which 110 is a power source,
A control unit 111 controls combustion by controlling the temperature of the electric heating element 104, detecting the room temperature by the room temperature detector 109, and performing various timing controls. The control unit 111 first performs preheating by turning on the relay 112 at the start of operation, and when the preheating is completed, the relay 112 is turned off and the relay 11 is turned on.
Blower 108 and electromagnetic pump 10 by turning on 3
2 and the igniter 114 are conducted to ignite and burn. The relay 115 is a two-circuit two-contact relay, and when the room temperature detected by the room temperature detector 109 is lower than the set temperature, the contact is closed on the a-contact side on the strong rotation side of the blower 108 and the a'contact side on the strong operation side of the electromagnetic pump 102. At the same time as the strong combustion, the blower 108 makes a strong rotation. Conversely, if the room temperature is higher than the set temperature, the relay 11
5 is closed to the b contact and b'contact sides, and the combustion becomes weak combustion, and at the same time, the blower 108 becomes weak rotation. The rotation speed of the blower 108 for strong rotation and weak rotation is set in consideration of the temperature rise inside the product and the temperature of the hot air at the outlet, so as to correspond to the combustion amount.

As described above, the conventional heater attempts to keep the room temperature constant by automatically changing the combustion amount and the blowing amount of warm air according to the room temperature, but the blowing amount is set to a predetermined number of revolutions according to the combustion amount. Inevitably, the amount of air blown and the amount of combustion operated only in accordance with one predetermined correlation. This is because the amount of air blown from the blower has a very close correlation with the amount of combustion.If the amount of air blown decreases when the amount of combustion is high, the internal temperature of the equipment rises too much and reliability decreases. If the temperature becomes too high, there is a risk of burns, so the air flow is fixed according to the amount of combustion.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, in recent years when the individual feeling tends to be emphasized, only a unique warm air can be obtained and a warm air of one's preference cannot be obtained, and There was a problem that a comfortable feeling of heating could not be obtained. In other words, there are large differences between humans, and there are people who feel hot or chilly even with the same warm air temperature, and there are people who feel that the wind from the blower is too strong. It's all different. Nevertheless, the temperature and volume of hot air are already determined at the time of design by the manufacturer of the equipment, and conventional hot air heaters do not allow the user to change the temperature of hot air according to their own preference. there were.

The present invention solves such a conventional problem. Normally, the combustion amount and the air flow amount can be automatically controlled in synchronization with each other.
Further, the present invention aims to obtain a desired warm air temperature by manually increasing or decreasing the combustion amount by a specific amount from the combustion amount at that time, if necessary.

Means for Solving the Problems In order to achieve the above object, the controller for the hot air heater according to the present invention detects the room temperature by the room temperature detector, and changes the hot air blowing amount according to the detected room temperature. The amount is corrected by the combustion amount correction means based on the operation signal of the manual switch for instructing the combustion correction amount.

Operation According to the present invention, the combustion amount and the warm air blowing amount are automatically set according to the detected room temperature by the above-mentioned configuration, and the set combustion amount is burned when the combustion amount changing means outputs the combustion amount. Since it is corrected by the amount correction means, only the combustion amount changes while the air amount remains the same, and a warm air different from the warm air during automatic control can be obtained.

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

FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is an outer frame of a hot air heater, 2 is a fuel tank, and 3 is a fuel supply whose discharge amount changes according to an applied pulse frequency. An electromagnetic pump, 4 is an electric heating element, and 5 is a vaporizer, which is heated to the vaporization temperature by the electric heating element 4. 6 is a combustor. The room temperature detector 7 is attached near the suction port of the blower 8 and inputs an electric signal obtained by converting the room temperature to the control device 10 inside the panel 9. Various switches are arranged on the panel 9 (not shown).

The controller 10 changes the pulse frequency output to the electromagnetic pump 3 according to the detected room temperature and the preset temperature set by the room temperature detecting means 11 which inputs the output of the room temperature detector 7, and thereby the combustion amount is changed. Blower 8 that is set in advance in a one-to-one correspondence with the combustion amount at the same time of changing
Of the blower 8 by inputting the combustion amount control means 12 for outputting the rotation speed information and setting information of the operation rotation speed of the blower 8 and changing the energization time per half-wave waveform output from the blower drive means 13 '. The blower air flow rate changing means 13 for adjusting to the set rotation speed, the switch processing means 14 for reading the operating condition of the switch arranged on the panel 9, and the switch processing means for the pulse frequency output from the combustion amount control means 12. A combustion amount correction means 15 for correcting the combustion amount by a specific amount according to the information of 14, and a pump driving means 15 'for receiving a pulse frequency information from the combustion amount correction means 15 and outputting a pulse signal to the electromagnetic pump 3. It consists of and. The switches 16, 17, and 18 are switches for instructing the correction amount of the operating frequency of the electromagnetic pump 3, and when the switch 16 is pressed, the operating frequency of the electromagnetic pump 3 is, for example, -1.66.
Hz, when the switch 18 is pressed, the output is increased or decreased by +1.66 Hz. When the switch 17 is pressed, the correction amount becomes zero.

FIG. 2 shows an example of a concrete circuit of the main part. Control device 1
Reference numeral 0 is composed of a microcomputer 19 and peripheral circuits. The microcomputer 19 shown here is
It is a so-called one-chip microcomputer having a CPU, a ROM, a RAM and an input / output unit.

The room temperature detector 7 is connected to the input section of the microcomputer 19 via the A / D converter 20. As a result, the temperature signal from the room temperature detector 7 is converted into a binary code and read by the microcomputer 19. Reference numeral 21 is an operation switch for instructing the start of combustion, and switches 16, 17, 1
It is input to the microcomputer 19 as in the case of 8.
Reference numeral 22 is a zero-cross detection circuit for generating a pulse signal having a width of about 1 ms for detecting the zero-cross point of the AC signal source 23 synchronized with the power supply frequency. The pulse signal instructs the microcomputer 19 to the zero-cross point. Reference numeral 26 is a semiconductor switch, which is composed of an LED of a light emitting portion and a triac of a light receiving portion. Reference numeral 27 is a relay for turning on and off the electric heating element 4, and 28 is an igniter. 25
Is a driver, and a semiconductor switch 26, a relay 27, an electromagnetic pump 3, and an igniter 28 are connected to the output terminals,
The output signal from the microcomputer 19 is amplified to drive each load. The electromagnetic pump 3 is applied with a pulse signal having a constant width shown by the diagonal lines in FIG. 3, and the fuel discharge amount, that is, the combustion amount changes according to the frequency of the pulse signal.

On the other hand, in the AC power supply 24, the electric heating element 4 via the contact 27 a of the relay 27 and the blower 8 via the semiconductor switch 26.
Are connected in parallel, and the blower 8 is phase-controlled. That is, the microcomputer 19 adjusts the blower 8 to an arbitrary number of revolutions by passing a current through the light emitting portion of the semiconductor switch 26 in synchronization with the pulse signal received from the zero-cross detection circuit 22 and changing the time for turning on the light receiving portion. be able to.

Next, the operation of this embodiment configured as described above will be described.
When the operation switch 21 is turned on, first, the relay 27 is turned on to energize the electric heating element 4 to perform preheating. When preheating is completed, after turning off the relay 27, turning on the igniter 28,
At the same time, the combustion amount control means 12 outputs a constant pulse signal from the output section to the electromagnetic pump 3 to perform ignition and combustion.

Hereinafter, the operation at the time of combustion will be described with reference to the flowchart of FIG. First, in step 29, the combustion amount is calculated according to the difference between the room temperature detected by the room temperature detector 7 and the set temperature, that is, the pulse frequency output to the electromagnetic pump 3 is calculated.
In step 30, the rotation speed of the blower 8 corresponding to the combustion amount calculated in step 29 is calculated. In step 31, the phase amount corresponding to the blower rotation speed obtained in step 30 is obtained, and in step 32, it is output from the output unit to the blower 8.
At step 33, the input processing of the switches 16, 17, and 18 is performed, and the process branches at step 34 according to the input situation at step 33. That is, if the switch 16 is pressed, the step 35 is processed, if the switch 18 is pressed, the step 336 is processed, and in the case of the switch 17, the process immediately shifts to step 37. Step 35 is Step 2
1.66 Hz is subtracted from the pulse frequency obtained in step 9, and step 36 adds 1.66 Hz to the pulse frequency obtained in step 30. In step 37, the corrected pulse frequency is converted into a pulse cycle that is convenient for output from the output section, and in step 38 the output section outputs it to the electromagnetic pump 3. According to the configuration of the above embodiment, as shown in the relationship between the combustion amount on the vertical axis and the rotation of the blower on the horizontal axis in FIG. 5, only the combustion amount can be increased or decreased without changing the air amount. This is because, for example, when a baby with weak skin is nearby or when it is desired to keep the greenhouse temperature low in the early spring, when the switch 16 is pressed, the amount of air blown remains and the amount of combustion decreases, so the temperature of warm air can be lowered. On the contrary, when the user wants to heat only his / her feet in a spotwise manner or when he / she wants to rapidly heat the body cooled outdoors, it can be solved by pressing the switch 18.

In the above embodiment, the increase / decrease of the combustion amount was set in three stages, but it is possible to set more combustion amount by increasing the number of switches. Also, if a variable resistor is used instead of a switch, the set value can be changed in an analog manner, so stepless setting is possible. Effect of the Invention As described above, according to the controller of the warm air heater of the present invention, Accordingly, the combustion amount and the blown air amount can be automatically controlled, and only the combustion amount can be manually changed, so that the desired warm air temperature according to the feeling of use can be obtained without impairing the stability of room temperature. In addition, since the amount that can be changed by changing the combustion amount can be limited in advance, it is possible to make an assumption that the temperature inside the equipment can be increased or the temperature of the hot air can be designed, and you can rest assured that there is no concern about the equipment's reliability or burns to the user. Can be used.

[Brief description of drawings]

FIG. 1 is a block diagram of a controller for a hot air heater according to an embodiment of the present invention, FIG. 2 is a concrete circuit diagram of the main part thereof, and FIG. 3 is a pulse signal similarly applied to the electromagnetic pump 3. 4 is a flow chart for explaining the operation during combustion, FIG. 5 is a graph showing the relationship between the combustion amount and the rotation speed of the blower, and FIG. 6 is a control of the conventional warm air heater. FIG. 7 is a schematic configuration diagram showing the device, and FIG. 7 is a control circuit diagram thereof. 6 ... Combustor, 8 ... Blower, 11 ... Room temperature detecting means,
12 ... Combustion amount control means, 13 ... Blower air volume change means, 15 ... Combustion amount correction means, 16, 17, 18 ... Switch.

Claims (1)

[Claims] 1. A combustor, a blower for sending air heated by the combustor into a room, a room temperature detecting means for detecting a temperature of a heated room, and a room temperature detected by the room temperature detecting means. Combustion amount control means for automatically changing the combustion amount based on the difference from the set temperature, and blower air volume changing means for automatically changing the air flow rate, a manual switch for instructing the combustion correction amount, and a combustion amount control means A control device for a hot air heater, comprising: a combustion amount correction means for increasing / decreasing a combustion amount to be changed by using an operation signal of the switch as an input signal.