JPH0351644Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hot-air heater that supplies fuel to a burner for combustion.

Conventional technology Conventionally, in the case of hot air heaters, the combustion state is not stable for a certain period of time at the initial stage of ignition, so for example, "strong",
Even in the type that could vary the combustion amount to "weak", combustion was performed for a certain period of time at "strong" combustion amount to stabilize the combustion state.

Problems that the invention aims to solve However, if re-combustion is started in early spring or early autumn after the combustion state is turned off and combustion is performed at the above-mentioned "strong" combustion rate for a certain period of time, the room temperature will rise too much. It was hot.

Means for Solving the Problems The present invention was made in order to eliminate the above-mentioned drawbacks, and is equipped with a control means in the microcomputer that makes the time during which combustion is performed at a constant combustion amount at the start of reburning shorter than the fixed time. be.

By doing this, at the start of reburning, combustion is performed with a constant combustion amount in a shorter time than at the initial stage of ignition via the control means in the microcomputer, so the combustion volume is smaller than at the initial stage of ignition, so the room temperature can be lowered. Do not allow it to rise abnormally.

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

FIG. 1 is a control circuit diagram of this embodiment, in which reference numeral 1 is a commercial power source, a control section 2 controls the ignition of an igniter (not shown), and A is operated and controlled by a microcomputer 8, which will be described later. A series circuit of the contact 4 of the relay 9 and the A solenoid valve 3, a series circuit of the contact 13 of the B relay 14 and the B solenoid valve 12 whose operation is controlled by the microcomputer 8, and a transformer that supplies power to the microcomputer 8. 5 primary windings 51 are connected in parallel. The operation of the A solenoid valve 3 is controlled to supply fuel to a burner (not shown) so that the combustion state is "strong" when energized and "weak" when not energized. The valve 12 is controlled to be ON during energization and OFF during non-excitation to supply fuel to the burner. Although not shown in this embodiment, the output side of the B solenoid valve 12 is branched into, for example, two circuits, one of which is
Fuel is supplied to the burner via the solenoid valve 3, and the other circuit supplies fuel to the burner as it is, and the flow rate of fuel in each circuit is controlled by the A solenoid valve 3.
It seems to flow more to the side. Reference numeral 6 denotes a rectifying bridge diode, which is connected to the secondary winding 52 of the transformer 5, has a constant voltage IC 7 connected to its output side, and is connected to the microcomputer 8 via the constant voltage IC 7. The microcomputer 8 has a built-in operation control sequence for the hot air heater, and is connected to the relay A9, the relay B14, a detection means (hereinafter referred to as a thermistor) 10 for detecting room temperature, and a volume 11 for setting the set room temperature. be.
The microcomputer 8 also controls the A relay 9 to operate and control the A solenoid valve 3 and the B solenoid valve 12 via the room temperature detected by the thermistor 10 so as to maintain the set room temperature.
and B relay 14, respectively. Furthermore, the microcomputer 8 has a built-in control means that makes the fixed time t ₂ during which combustion is performed at a constant combustion amount at the start of reburning after the combustion state OFF control is shorter than the fixed time t ₁ during which combustion is performed at a constant combustion amount at the initial stage of ignition. are doing.

Next, the operation of this embodiment will be described.

At the initial stage of ignition when the heater starts operating, the time t ₁ (for example, about 3 minutes) is constant as shown in FIG. During this period, the contacts 4 and 13 of the A relay 9 and the B relay 14 are closed via the microcomputer 8, and the A solenoid valve 3 and the B solenoid valve 12 are closed.
Burns at a constant combustion rate in a "strong" combustion state where the fuel is excited. After a certain period of time _t1 has elapsed, the thermistor 10 controls switching between energizing and de-energizing the A solenoid valve 3 to maintain the set room temperature, e.g. 20°C.
"Weak" combustion state at ~18℃, "strong" at below 18℃
Combustion control is performed via the microcomputer 8 so that the combustion state is achieved. For example, when the room temperature exceeds 21℃,
The solenoid valve 12 is controlled OFF to stop combustion.
Furthermore, when the room temperature drops to, for example, 18°C or lower after the combustion state is turned OFF, the temperature detected by the thermistor 10 causes the microcomputer 8 to control B.
When the solenoid valve 12 is turned ON, the A solenoid valve 3
is also excited through the contact 4, and "strong" combustion is performed for a certain period of time t ₂ (for example, about 1 minute) such that certain period of time t ₁ > certain period of time t ₂ . After a certain period of time _t2 has elapsed, contact 4 is activated via the microcomputer 8 as described above to reach the set room temperature.
``Strong'' by A solenoid valve 3 due to closing and opening of .
Performs "weak" combustion control. After that, repeat the same procedure.

Effects of the invention As described above, according to the present invention, at the start of reburning, combustion occurs at a constant combustion rate for a period of time shorter than the fixed time during which combustion occurs at a constant combustion rate at the initial stage of ignition. The amount of combustion is lower than the initial amount, and the combustion state is OFF like in early spring or early autumn.
It is possible to obtain a hot air heater that suppresses an abnormal rise in room temperature at the start of reburning even in a period when many controls are required.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram relating to combustion control of a hot air heater according to an embodiment of the present invention, and FIG. 2 is a flowchart thereof. 3...A solenoid valve, 8...Microcomputer, 9...A relay, 10...Detection means, 12...B solenoid valve, 1
4...B relay, _t1 ; _t2 ...certain time.

Claims (1)

[Scope of utility model registration request] The detection means 10 detects the room temperature, and the combustion state of the burner is set to "strong" at a temperature in a range related to the set room temperature.
The A solenoid valve 3 operates to perform "weak" control, and controls the combustion state of the burner to be OFF at temperatures above the temperature range related to the set room temperature, and controls the combustion state of the burner to be ON at the initial stage of ignition and at the start of reburning. The B solenoid valve 12 operates as shown in FIG.
The microcomputer 8 is equipped with a microcomputer 8 that controls the operation of the A solenoid valve 3 at the initial start of operation for a certain period of time _t1 at a constant combustion amount in "strong" combustion and after the combustion OFF control. Start combustion, A solenoid valve 3
1. A hot-air heater characterized by comprising a control means that satisfies the condition that the constant time t ₁ > the constant time t ₂ in the constant time t ₂ at a constant combustion amount in "strong" combustion in which is excited.