JPS63318413A - Controller for warm-air heater - Google Patents

Abstract

PURPOSE:To obtain a preferable warm-air temperature, by a method wherein either one of the amount of combustion or the amount of ventilation, both of which are changed in accordance with a detected room temperature, is corrected based on an operating signal for a manual switch while the correction is cancelled by the operation of a temperature setting means. CONSTITUTION:A controller is constituted of a room temperature detecting means 11, inputting the output of a room temperature detector 7, an amount of combustion changing means 12, changing the amount of combustion in accordance with a temperature difference between the detected room temperature and a set temperature set by a temperature setting means 19, a fan airflow rate changing means 13, outputting an information on the number of rotation of a fan 8 to regulate the same to a set number of rotation, a switch treating means 14, reading the operating state of switches arranged on a panel 9, and a fan airflow rate correcting means 15, outputting a valve, in which the set number of rotation of the fan 8 is added with the correction of a specified amount in accordance with the information, to a fan driving means 13A. A correction resetting unit 20, cancelling an input correction by the switch, outputs the output of the fan airflow rate changing means 13 to the fan driving means 13A as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a combustor control device that varies the amount of air blown by a combustor and a blower depending on room temperature.

BACKGROUND TECHNOLOGY Hot-air heaters that are generally referred to as automatic temperature control types automatically change the amount of combustion depending on the room temperature detected by a built-in room temperature detector and the set temperature.

This type of heater uses a blower to blow heated air into the room, and when the room temperature is low, it increases the combustion rate and at the same time increases the air flow to a strong air volume to send warm air far away. When the room temperature rises, the room temperature is controlled by lowering the amount of combustion and reducing the air volume. Specifically, this change in the amount of air blown is performed by changing the rotational speed of the blower, and conventionally, this change in the amount of air blown was simultaneously changed in conjunction with the above-mentioned change in the amount of combustion. Therefore, the user only needs to set the set temperature, and the device then automatically determines the amount of combustion and air flow, raises the room temperature to the set temperature, and maintains the room temperature at that temperature.

FIG. 7 is a schematic diagram showing a conventional combustion configuration.

101 is a fuel tank, and fuel oil is sucked up by an electromagnetic pump 102 and fed under pressure to a carburetor 103.

The vaporizer 103 is completely heated by the heat generated by combustion and the electric heating element 104, and the fuel oil is vaporized here and sent to the nozzle 105.
It is ejected into the mixing tube 106, sucks in secondary air, and ejects from the flame port 107, where it is combusted. Combustion heat is generated by blower 10
At step 8, the air is sent to the air outlet A, from where it is sent into the room. Further, the room temperature detector 109 is attached near the suction port of the blower 10B.

FIG. 8 shows a conventional control circuit, in which 110 is a power supply;
A control unit 111 performs combustion control by controlling the temperature of the electric heating element 104, detecting the room temperature by the room temperature detector 109, and controlling various timings. The control unit 111 first performs preheating by turning on the relay 112 at the start of operation, and when the preheating is completed, turns off the relay 112 and turns on the relay 113 to energize the blower 108, electromagnetic pump 102, and igniter 114 to ignite. , to burn.

The relay 115 is a 2-circuit, 2-contact relay that connects the room temperature detector 10.
If the room temperature detected at step 9 is lower than the set temperature, the combustion will close to the a and a' sides and the combustion will become strong, and at the same time the blower 108 will rotate at high speed. Conversely, if the room temperature is higher than the set temperature, relay 11
5 closes to the b' side, combustion becomes weak combustion and at the same time, the blower 108 becomes weak rotation. The high and low rotational speeds of the blower 108 are set in consideration of the temperature rise inside the product and the temperature of the hot air at the outlet, so that the rotational speed corresponds to the amount of combustion.

As mentioned above, conventional hot air heaters automatically change the amount of combustion and air flow depending on the room temperature to keep the room temperature constant, but the amount of air flow only reaches a predetermined rotational speed depending on the amount of combustion. The amount of airflow and combustion amount operated only with one type of predetermined correlation. This is because the amount of air blown by the blower has a very close correlation with the amount of combustion, and if the amount of air blown decreases when the amount of combustion is high, the internal temperature of the equipment will rise too much, reducing reliability. Because there is a risk of burns if the temperature gets too high, the amount of air blown is fixed according to the amount of combustion.

Problems to be Solved by the Invention However, in recent years, where personal taste is considered important, the above-mentioned conventional configuration can only provide a unique type of warm air, and it is difficult to obtain hot air according to one's personal preference. In some cases, there was a problem in that a comfortable feeling of heating could not be obtained. In other words, human sensations vary greatly from person to person; some people feel hot and others feel chilly even when the temperature of hot air is the same, and some people feel that the wind from the blower is too strong. Despite this, the hot air temperature remains only at the temperature set at the time of design by the manufacturer, and if you want to change the air volume, you must also change the combustion volume.

As described above, conventional hot air heaters do not allow users to change the temperature or air volume of the hot air according to their own preferences, and some people have had the problem of not being able to obtain a comfortable feeling of heating. .

The present invention solves this conventional problem. Normally, the combustion amount and the airflow amount change automatically in synchronization, but if necessary, the airflow amount can be manually increased or decreased by a specific amount from the current airflow amount. In this way, it is possible to obtain the desired hot air, and the air volume increase/decrease mode is intended to be set to the normal air volume mode when the set temperature of the room temperature adjustment is changed.

Means for Solving the Problems In order to achieve the above object, the hot air heater control device of the present invention detects the room temperature with a room temperature detector, and changes either the combustion amount or the air blowing amount depending on the detected room temperature. One of them is configured such that the correction means corrects the correction amount based on an operation signal of a manual switch that instructs the correction amount, the change means changes it, and the correction is canceled by operating the temperature setting means.

Effect The present invention has the above-described configuration, and sets the combustion amount and air blowing amount according to the detected room temperature, but the set air blowing amount or combustion amount is corrected before being outputted from the blower airflow or the phosphor meter changing means. Since the temperature is corrected by the means, it is possible to obtain warm air that is different from the warm air when the automatic control is complete.

Since this correction is reset by operating the temperature setting means, when the set temperature is changed, the same warm air as under automatic control can be obtained.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Figure 1 is a configuration diagram of this embodiment, where 1 is the outer frame of the warm air heater, 2
3 is a fuel tank, 3 is an electromagnetic pump whose discharge rate changes depending on the applied pulse frequency, 4 is an electric heating element, 5 is an electric device, and 6 is a combustor. Further, the room temperature detector 7 is installed near the inlet of the blower 8, and inputs an electrical signal obtained by converting the room temperature to the control device 10 located inside the spring/L/9. Various switch groups are also arranged on the panel 9 (not shown).

The control device 10 includes a room temperature detection means 11 which receives the output of the room temperature detector 7 as an input, and a pulse frequency output to the electromagnetic pump 3 according to the temperature difference between the detected room temperature and the set temperature set by the temperature setting means 19. A combustion amount changing means 12 that changes the combustion amount by changing the amount of combustion; and a blower air volume changing means that outputs rotation speed information of the blower 8 and adjusts the blower 8 to a set rotation speed by changing the energization time per half wave waveform. 13
, a switch processing means 14 that reads the operation status of the switches arranged on the panel 9, and a set rotation speed of the blower 8 outputted from the blower air volume changing means 13 according to the information of the switch processing means 14. and a blower air volume changing means 15 for outputting a value obtained by adding a specific amount of correction to the blower driving means 13A. Switch 16.17.1
8 is a non-locking switch that instructs the rotation correction amount of the blower 8. When the switch 16 is pressed, the operating rotation speed of the blower 8 is increased or decreased by, for example, -9 Orpm, and when the switch 18 is pressed, the rotation speed is increased or decreased by +9 Orpm. The correction amount is set to zero when the button is pressed. 20 is a switch 16.1 when the temperature setting means 19 is inputted.
A correction reset unit that cancels the input correction according to 7.18 causes the output from the blower air volume changing means 13 to be output as is to the blower driving means 13A.

FIG. 2 shows an example of a specific circuit of the main part. Control device 1
0 consists of a microcomputer 21 and peripheral circuits. Microcomputer 1121 shown here
has a CPU, ROM, RAM, and an input/output section,
This is a so-called one-chip microcomputer.

Room temperature detector 7 is connected to an input section of microcomputer 21 via an A/D converter. As a result, the temperature signal from the room temperature detector 7 is converted into a binary code and read into the microcomputer 21. Reference numeral 23 denotes an operation switch for instructing the start of combustion, which is input to the microcomputer 21 in the same way as switches 16, 17, and 18. 24
is a zero-cross detection circuit that detects the zero-cross point of the AC signal source 25 synchronized with the power supply frequency and generates a pulse signal having a width of about 1 mg, and uses this pulse signal to instruct the microcomputer 21 about the zero-cross point. A semiconductor switch 28 is composed of an LED as a light emitting part and a triac as a light receiving part. 29 is a relay for turning on and off the electric heating element 4, and 30 is an igniter. A driver 27 has an output connected to a semiconductor switch 28, a relay 29, an electromagnetic pump 3, and an igniter 30, and amplifies the output signal from the microcomputer 21 to drive each load.

On the other hand, an electric heating element 4 via a contact 27-a of a relay 29 and a blower 8 via a semiconductor switch 28 are connected to the AC power source 26 in parallel, and the blower 8 is phase-controlled. That is, as shown in FIG. 3, the microcomputer 21 detects the zero cross point every half wave using the pulse signal from the zero cross detection circuit 24, and detects the zero cross point for a certain period of time (+).
Later, when an on signal is output from the output section, driver 2
A current flows through the light emitting part of the semiconductor switch 28 through the semiconductor switch 7, the triac of the light receiving part becomes conductive, and the current is supplied to the blower 8. The time t (hereinafter referred to as “
If the phase off time (referred to as "phase off time") is long, the rotation speed of the blower 8 tends to decrease, and if it is short, it tends to increase.
The result will be as shown in the figure.

Next, the operation of this embodiment configured as described above will be explained.

When the operation switch 23 is turned on, the relay 29 is first turned on to energize the electric heating element 4 and preheat it. When preheating is completed, the relay 29 is turned off, and then the igniter 30 is turned on, and at the same time, the combustion amount changing means 12 outputs a constant pulse signal from the output section to the electromagnetic pump 3 to perform ignition and combustion. onwards,
The operation during combustion will be explained using the flowchart shown in FIG.

First, in step 31, a combustion amount is calculated according to the difference between the room temperature detected by the room temperature detector 7 and the set temperature set by the temperature setting means 11. In step 33, the pulse frequency is converted into a pulse frequency corresponding to the combustion amount determined in step 31, and in step 34, the pulse frequency is outputted from the output section to the electromagnetic pump 3. Step a5 detects the input state of the switch 16.degree. That is, if the switch 16 is pressed and the air volume reduction mode is set, step 38 is executed.
If the switch 18 is pressed and the air volume increase mode is selected, step 39 is processed, and if the switch 17 is pressed and the air volume mode is normal, the process immediately proceeds to step 40. Step 38 is 9O from the blower rotation speed determined in step 32.
rpm is subtracted, and step 39 adds 9 Orpm to the blower rotation speed determined in step 32. In step 40, a phase off time t corresponding to the fan rotation speed is determined from a correlation table between a preset phase off time t and the fan rotation speed.
, which is output from the output section in step 41.

Then, in step 42, it is determined whether or not an input operation has been performed using the temperature setting means 19. If the input operation has not been performed, the corrected data is directly output to the blower 8.

Here, when the user operates the temperature setting means to change the set temperature, the process moves to step 43, cancels the correction, returns to the normal air volume mode, changes the set temperature, and returns to step 35, where the switch 16 The same operation as above is repeated by looking at the input state of .17.18.

According to the configuration of the above embodiment, only the amount of air blown can be increased or decreased without changing the amount of combustion, as shown in the relationship between the amount of combustion and the number of rotations of the blower in FIG. 6. Even though the room temperature is low and combustion is strong, if the floor, walls, ceiling, etc. are completely cold, the temperature of the hot air may feel low. Since the number decreases by 9 Orpm, the temperature of the hot air increases and the feeling of cold air can be eliminated. Furthermore, if the hot air is strong and makes you feel uncomfortable because it hits your skin directly, you can set the air volume to decrease so that it does not hit your skin directly by pressing the switch 16. On the other hand, if you feel that the hot air temperature is too hot or if you want the hot air to reach a further distance, you can solve the problem by pressing the switch 18.

In the above embodiment, the blower air volume is increased or decreased, but the same applies to the combustion amount, and by increasing the number of switches, it is possible to set a larger amount. Furthermore, if a variable resistor is used instead of a switch, the set value can be changed in an analog manner, allowing stepless setting.

Effects of the Invention As described above, according to the hot air heater control device of the present invention, the air flow rate is automatically changed according to the combustion amount, and at the same time, only the air volume or the combustion amount can be further changed manually, which improves the stability of the room temperature. The effect is that you can obtain the desired warm air according to the feeling of use without impairing the sense of use. Furthermore, since the above-mentioned change correction amount can be limited in advance, if it is set to the limit allowed by the design according to the temperature rise inside the device or the temperature of hot air, it can be used with confidence without worrying about reliability or burns. If you change the set temperature of the room, the combustion amount and air flow will change accordingly, so the air volume mode that matched your previous preferences may not always be appropriate for the changed set temperature. However, in the present invention, since the air volume automatically returns to the normal air volume at this time, there is no need to take the trouble to cancel the air volume mode, which is very convenient.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a control device in an embodiment of the present invention;
Fig. 2 is a specific circuit diagram of the same main part, Fig. 3 is a phase control waveform diagram of the blower 8, Fig. 4 is a correlation diagram between the phase off time and the rotation speed of the blower 8, and Fig. 5 6 is a flowchart explaining the operation during combustion, and FIG. 6 is a graph showing the relationship between the amount of combustion and the rotation speed of the blower.
FIG. 7 is a schematic configuration diagram showing a conventional combustion configuration, and FIG. 8 is a control circuit diagram of the conventional example. 6... Combustor, 8... Blower, 11.
... Room temperature detection means, 12 ... Combustion fine control means, 13 ... Blower air volume changing means, 15 ...
...Blower air volume correction means, 16.17.18...
... Switch, 19 ... Temperature setting means, 20
...Correction reset section. Name of agent: Patent attorney Toshio Nakao and one other person wE
Figure 2 a off time Keeping in mind Figure 4, off-quiet A (Processing Figure 5 Figure 6 (r/'ψt))

Claims (1)

[Claims] A combustor, a blower that sends air heated by the combustor into the room, a room temperature detection means for detecting the temperature in the heated room, a temperature setting means for setting the indoor heating temperature, and detection by the room temperature detection means. a combustion amount changing means that automatically changes the combustion amount by using the difference between the room temperature and the set temperature set by the temperature setting means as an input signal; and a blower air volume changing means that automatically changes the air blowing amount; a manual switch for instructing a correction amount of the air flow rate; a correction means for increasing or decreasing the combustion amount or the blower air volume changed by the combustion amount or blower air volume changing means using an operation signal of the switch as an input signal; A control device for a warm air heater, comprising a correction reset function that cancels a correction amount by a correction means by an operation.