JP2001272033A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide combustion equipment which can prevent its temperature stability from getting worse due to change in atmospheric temperature when the equipment restarts the delivery of hot water after stopping combustion. SOLUTION: Upon detecting the closure of a hot water tap, this combustion equipment stops combustion by stopping oil flow in the oil passage of a hot water supplier. Though the equipment starts a blower for hastening the igniting speed when the equipment is ignited next simultaneously with the combustion stoppage, the equipment controls the number of revolutions or/and rotating duration of the blower based on the temperature detected by means of an atmospheric temperature thermistor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus comprising at least a heat exchanger, a blower for sending combustion air, and a temperature thermistor for detecting temperature.

[0002]

2. Description of the Related Art Conventionally, in a combustion apparatus such as a water heater, as a method of supplying hot water having a stable temperature at the time of re-ignition after stopping combustion, hot water in a heat exchanger is supplied at a temperature higher than a set temperature of equipment. And a method of supplying hot water at a stable temperature by mixing with hot water. In addition, if the speed of the ignition is not increased, the water supplied to the equipment flows into the heat exchanger. Therefore, the blower is operated for a certain period of time to prepare for the next ignition. However, if the operation time of the blower becomes longer, the hot water in the heat exchanger is cooled, so that the temperature of the hot water in the heat exchanger becomes lower than the set temperature of the equipment. Can not supply hot water. The time to operate the blower is determined from the balance between these two.

[0003]

However, in the conventional combustion apparatus, in order to supply hot water at a stable temperature at the time of ignition,
The temperature of the hot water in the heat exchanger must be at least higher than the set temperature of the equipment. However, the actual outside temperature varies from low to high, so the temperature at which the heat is cooled by the heat exchanger is not constant. Therefore, if the number of rotations and the rotation continuation time of the blower immediately after combustion stop are fixed, it is not possible to cope with various air temperatures.

[0004] Accordingly, an object of the present invention is to provide a combustion apparatus that prevents the temperature stability at the time of re-watering after stopping the combustion from being deteriorated by a change in air temperature.

[0005]

In order to achieve the above object, a combustion apparatus comprising at least a heat exchanger, a blower for sending combustion air, and a temperature thermistor for detecting air temperature is provided. Since the number of revolutions and / or the duration of rotation of the blower after the combustion is stopped is controlled by the detected value of the temperature thermistor immediately after the combustion is stopped, the temperature stability at the time of re-starting the hot water after the combustion is stopped is determined by the temperature. It does not get worse.

When the detected value of the temperature thermistor immediately after the combustion is stopped is lower than a predetermined value, the rotation speed of the blower after the combustion of the combustion device is stopped is reduced and the rotation continuation time is lengthened. To reduce the rotation speed of the blower,
This is because the temperature of the heat exchanger is low because the outside air temperature is low, so that the temperature is prevented from rapidly dropping. The reason why the rotation continuation time of the blower is increased is to increase the ignition speed at the time of re-starting hot water after stopping the combustion because the outside air temperature is low. The rotation continuation time at that time is arbitrarily set so that the temperature of the heat exchanger becomes low and does not affect the time of tapping.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram in which a combustion device according to one embodiment of the present invention is applied to an oil water heater. As shown in the figure, the oil hot water heater supplies water through a heat exchanger 7 through a water heater main body 1, a water supply pipe 3 for supplying water from the water source to the water heater main body 1, and water heated in the water heater main body 1. And a hot water supply pipe 5 for supplying the hot water to the hot water tap 11.

The water supply pipe 3 is provided with an incoming water temperature sensor 23 for detecting the temperature Tc of water from a hot water supply source and a water amount sensor 25 for detecting the amount Q of water.
And a heat exchange temperature sensor 30 for detecting a temperature Th of the hot water heated by the heat exchanger 7. Further, a mixing servo 14, which mixes the hot water temperature Th and the water Tc heated by the heat exchanger 7,
And a set temperature Ts by a remote controller (not shown).
Temperature setting device for setting the temperature.

The water heater body 1 also has a blower 9 for supplying air required for combustion. Further, an igniter 3 necessary for igniting is provided above the burner 13.
The kerosene supply pipe 50 includes an electromagnetic pump 51 for supplying kerosene, a flow regulating valve 52 for varying the amount of kerosene to be supplied, and an oil solenoid valve 53 for stopping / starting the supply of kerosene. Each is provided. In addition, water heater 1
Inside, a temperature thermistor 60 for detecting the temperature Tk is provided. FIG. 2 is a control sequence according to an embodiment of the present invention. It is described that the number of rotations and / or the duration of rotation of the blower for the next ignition after hot water supply combustion is changed depending on the temperature of the temperature thermistor.

First, at step S1, it is determined whether or not the hot water tap 11 is closed. If it is closed, combustion is stopped at step S2.
Then, in step S3, the detected value of the temperature thermistor is 25 ° C.
Judge whether the temperature exceeds 25 ° C.
In step S7, the rotation speed of the blower is set to 5500 rpm, and it is determined whether 60 seconds have elapsed (step S8). If 60 seconds have elapsed in step S8, step S6
To stop the fan and return to step S1 again. If 60 seconds have not elapsed in step S8, the process directly returns to step S1. If the detected value of the temperature thermistor does not exceed 25 ° C. in step S3, the rotation speed of the blower is set to 4000 rpm in step S4, and it is determined in step S5 whether 90 seconds have elapsed. If 90 seconds have elapsed in step S5, the fan is stopped in step S6, and the process returns to step S1. If 90 seconds have not elapsed in step S5, the process directly returns to step S1. Further, when it is determined in step S1 that the hot water tap is open, combustion is started in step S9,
It returns to step S1.

It is to be noted that only one of the rotation continuation time and the rotation speed of the blower may be changed.

[Brief description of the drawings]

FIG. 1 is a block diagram in which a combustion device according to one embodiment of the present invention is applied to an oil water heater;

FIG. 2 is a control sequence according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Oil hot water heater main body 7 ... Heat exchanger 9 ... Blower 60 ... Temperature thermistor

Claims (2)

[Claims] 1. A combustion apparatus comprising at least a heat exchanger, a blower for sending combustion air, and a temperature thermistor for detecting air temperature, wherein the number of rotations and / or the duration of rotation of the blower after the combustion of the combustion apparatus is stopped. Is controlled by a detection value of the temperature thermistor immediately after the combustion is stopped. 2. When the detected value of the temperature thermistor immediately after the combustion is stopped is lower than a predetermined value, the number of rotations of the blower after the combustion of the combustion device is stopped is reduced, and the rotation continuation time is lengthened. The combustion device according to claim 1, wherein