JPH065130B2 - 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 a set temperature and automatically switches the combustion amount according to the temperature 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. When that happens, the room temperature is controlled by lowering the combustion volume and the air volume. 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 after that, the equipment automatically determines the combustion amount and the blown air amount, 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. 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. 8 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
Blower 108 and electromagnetic pump 10 by turning on 3
2 and the igniter 114 are energized 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, and if the amount of air blown decreases when the amount of combustion is strong, the internal temperature of the equipment rises too much, reducing reliability and increasing the temperature of warm air. There is a danger of burns if it passes, 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 sense tends to be weighted, only a unique warm air can be obtained and a warm air of one's liking cannot be obtained. 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 warm air temperature and air volume are already determined at the time of designing by the manufacturer of the equipment, and in the conventional hot air heater, the user cannot change the temperature of the hot air according to his or her preference, and It was not easy to use for some.

The present invention solves such a conventional problem. Normally, the combustion amount and the air flow amount are automatically changed in synchronization with each other, but when the combustion amount is less than a predetermined value, the warm air flow amount or the combustion amount is changed as necessary. It is intended that the desired warm air temperature can be obtained by manually increasing or decreasing only the specified amount from the warm air blowing amount or combustion amount at that time.

Means for Solving the Problems In order to achieve the above object, the control device for a hot-air heater according to the present invention has a manual switch for instructing the correction of the air flow rate or the combustion amount, and whether or not the correction is performed according to the combustion amount. Correction amount determining means for determining whether the warm air blowing amount or the combustion amount is changed according to the room temperature detected by the room temperature detector, and is increased or decreased based on the output from the correction determining device. .

Operation According to the present invention, the combustion amount and the warm air blowing amount are automatically set according to the detected room temperature, but the set combustion amount or the blowing amount is output from the combustion amount or the blower air amount controlling means. Since it is corrected before the temperature is changed, only one of the combustion amount and the blown air amount remains unchanged and only the other is changed, so that 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. Electromagnetic pump,
Reference numeral 4 is an electric heating body, and 5 is a vaporizer, which is superheated to a vaporization temperature by the electric heating body 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 that receives the output of the room temperature detector 7, for example, 3000kcal to 1000kcal
A combustion amount control means 12 for changing the combustion amount in the range, and a blower air volume control means 13 for outputting the rotation speed information of the blower 8 which is preset in a one-to-one correspondence with the combustion amount.
Switch processing means 14 for reading the operation status of switches arranged on the panel 9, and correction determination means for judging the combustion amount and validating the correction operation instructed by the manual switch only when the combustion amount is less than a predetermined value. 15 and when the combustion amount is less than a predetermined value, the blower air volume control means 13
The blower air volume correction means 15 'for adding the correction amount instructed by the switch processing means 14 to the set rotation speed of the blower 8 output from the blower 8 and the operating speed information of the blower 8 are input, and energization per half-wave waveform to be output. It is composed of a blower drive means 13 'for adjusting the blower 8 to a set rotational speed by changing the time. Further, the correction determination means 15 receives a command from the switch processing means 14 to set a correction amount, and when the combustion amount output from the combustion amount control means 12 is larger than 2000 kcal, for example, " A combustion amount determination unit 15-b that determines “without correction” and, if less than 2000 kcal, determines “with correction”.
If the determination of the combustion amount determination unit 15-b is "corrected", the blower air volume control unit 13 is connected to the correction amount setting unit 15-a, and if the determination is "no correction", it is connected to the blower drive unit 13. And a switching unit 15-c that acts on the. The switches 16, 17, and 18 are switches for instructing the rotation correction amount of the blower 8. When the switch 16 is pressed, the operating speed of the blower 8 is, for example, -90 rpm,
When is pressed, the speed is increased or decreased by +90 rpm. 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 that generates 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 indicates the zero-cross point to the microcomputer 19. 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. A driver 25 is connected to the semiconductor switch 26, the relay 27, the electromagnetic pump 3, and the igniter 28 at its output terminal, and amplifies the output signal from the microcomputer 19 to drive each load. A pulse signal is applied to the electromagnetic pump 3, and the fuel discharge amount, that is, the combustion amount changes according to the frequency of the pulse signal.

On the other hand, to the AC power supply 24, the electric heating body 4 via the contact 27a 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, as shown in FIG. 3, the microcomputer 19 detects the zero-cross point for each half-wave by the pulse signal from the zero-cross detection circuit 22, and the fixed time (t)
After that, when an ON signal is output from the output unit, a current flows through the driver 25 to the light emitting unit of the semiconductor switch 26, the triac of the light receiving unit conducts, and the current is supplied to the blower 8.
If the time t during which the blower 8 is turned off for each half wave (hereinafter referred to as "phase off time") is long, the rotation speed of the blower 8 tends to decrease and the rotation speed tends to increase when the blower 8 is short, and the correlation is as shown in FIG. Become.

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, at 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 pulse frequency obtained in step 29 is output from the output unit to the electromagnetic pump 3. Step 32 is switch 16, 17, 1
The input process of 8 is performed, and the process branches at step 33 according to the input situation of step 32. That is, if the switch 16 is pressed, the step 34 is processed, if the switch 18 is pressed, the step 35 is processed, and in the case of the switch 17, the process immediately shifts to step 36. Step 3
Reference numeral 2'denotes a judgment unit for judging the combustion amount calculated in step 29. If the combustion amount is 2000 kcal or more, the process proceeds to step 36, and if it is 2000 kcal or less, the process proceeds to step 33. Step 34 is 9 from the blower rotation speed obtained in step 30.
0 prm is subtracted, and step 35 adds 90 rpm to the blower rotation speed obtained in step 30. In step 36, the phase off time t corresponding to the blower rotation speed is obtained from the correlation table between the preset phase off time t and the blower rotation speed. In step 37, the blower 8 is output from the output unit.
Output to.

According to the configuration of the above-described embodiment, as shown in the relationship between the combustion amount on the horizontal axis and the rotation speed of the blower on the vertical axis in FIG. 6, it is possible to increase or decrease only the air flow amount without changing the combustion amount. This is because, for example, when an infant with weak skin is nearby or when it is desired to keep the warm air temperature low in the early spring, when the switch 18 is pressed, the air flow rate increases while the combustion amount remains the same, so the warm air temperature can be lowered. . On the contrary, when it is desired to heat only the feet in spots, or to rapidly heat the body that has been cooled outdoors, it can be solved by pressing the switch 16.

In addition, in the above-described embodiment, the description has been made by increasing / decreasing the blower air volume, but this is also the case of increasing / decreasing the combustion amount, and the increase / decrease can be set more by increasing the number of switches instead of increasing / decreasing each step. Is possible. 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 controller of the hot air heater of the present invention,
The amount of combustion and the amount of air blown can be automatically controlled according to the room temperature, and either the amount of combustion or the amount of air blown can be changed manually, so the desired warm air temperature according to the feeling of use without compromising room temperature stability. Is obtained. In addition, in the present invention, when the combustion amount is large, the combustion amount or the blown air amount that is automatically set is prioritized over the correction that is manually set. There is an advantage that the wind temperature is not raised and it is safe.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a hot air heater according to an embodiment of the present invention, FIG. 2 is a specific circuit diagram of the same part, and FIG. 3 is a phase control waveform diagram of the blower 8, Similarly, FIG. 4 is a correlation diagram between the phase off time and the rotation speed of the blower 8, FIG.
FIG. 6 is a flow chart for explaining the operation at the time of combustion, FIG. 6 is a graph showing the relationship between the combustion amount and the number of revolutions of the blower, and FIG. 7 is a schematic configuration diagram showing a controller of a conventional hot air heater. FIG. 8 is a control circuit diagram of the same. 6 ... Combustor, 8 ... Blower, 11 ... Room temperature detecting means,
12 ... Combustion amount control means, 13 ... Blower air volume control means, 15 ... Correction determination means, 15 '... Blower air volume correction means, 15-a ... Combustion amount determination section, 16, 17, 18 ...
…switch.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroo Oshima Inventor Hiroo Oshima 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) (JP, Y2)

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 using the temperature difference from the set temperature as an input signal, and blower air volume control means for automatically changing the air flow amount, and manual operation for instructing the correction amount of the blower air amount or the combustion amount. A switch, a correction determination unit that determines the combustion amount and validates the correction operation instructed by the manual switch only when the combustion amount is less than a predetermined value, and an air blowing amount or a combustion amount based on the output from the correction determination unit. A controller for a hot-air heating machine, comprising: