JPH1137412A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device for varying a combustion quantity under a constant air quantity. SOLUTION: A control part outputs a drive signal to a pump so as to decrease liquid fuel supplied to a burner 15 when a required combustion quantity is low. When the required combustion quantity is high, the control part outputs a drive signal to the pump so as to increase the liquid fuel supplied to the burner 15. The supplied liquid fuel infiltrates through a core and is burnt under the constant combustion quantity. At this time, a drive signal is outputted to a fan so that the air quantity supplied to the burner 15 becomes constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus for burning a body to be heated with fuel and air.

[0002]

2. Description of the Related Art Conventionally, there has been known a combustion apparatus which controls a combustion amount by adjusting a fuel amount and an air amount, respectively.

[0003]

However, the conventional combustion apparatus has a problem that the combustion range with respect to the air volume is narrow because the combustion amount is varied by varying the fuel supply amount with one burner. In addition, when the combustion amount is small, the air volume also becomes small, and it is necessary to take measures against wind pressure. Since both the fuel and the air volume are made variable, there is a problem that the control specifications become complicated.

Accordingly, it is an object of the present invention to provide a combustion apparatus that varies the amount of combustion while keeping the air volume constant.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a combustion apparatus for controlling heating of an object to be heated with fuel and air, wherein the apparatus burns at a constant amount of combustion. A heating unit constituted by a combustion unit, an ignition unit for igniting the heating unit, an air supply unit for supplying a certain amount of air to the heating unit, a fuel supply path for supplying fuel to the combustion unit, Provided in the fuel supply path, and a fuel variable means for varying a supply amount of fuel according to a required combustion amount, so that a constant amount of air only needs to be supplied at all times. There is no need to control the number of rotations, and cost savings can be achieved. Also,
Since the fan motor is always used at the maximum capacity, a change in air volume can be suppressed even when the wind pressure increases.

In a preferred embodiment, the combustion section includes:
A fuel supply passage and a core are provided, and fuel is supplied to the fuel supply passage and permeates the core to burn.
According to this embodiment, since the combustion control is performed by changing the area of the burning portion to be burned, the amount of fuel and the amount of air per unit area are always constant. Thus, stable combustion can be performed even when the amount of air fluctuates.

The fuel variable means is a fuel supply pump, and varies the amount of combustion by driving / stopping the fuel supply pump. Further, the fuel supply pump performs drive control so as to supply more fuel to the combustion section as the required combustion amount increases.

A combustion device for heating and controlling a body to be heated with fuel and air, comprising a combustion section comprising a plurality of burners burning at a fixed combustion amount, and ignition means for igniting the combustion section Supplying air to the combustion unit, supplying air to the combustion unit, supplying fuel to the combustion unit, and supplying fuel to the plurality of burners according to a required combustion amount. Since the fuel supply means for stopping is provided, it is sufficient to always supply a constant amount of air, as described above, so that it is not necessary to control the rotation speed of the fan motor of the air supply means, and cost reduction can be achieved. it can. Further, since the fan motor is always used at the maximum capacity, it is possible to suppress a change in air volume even when the wind pressure increases.

In a preferred embodiment, the fuel supply means is an open / close valve for starting / stopping the fuel supply to each of the plurality of burners, and the fuel supply means opens as the required combustion amount increases. Increase the number of on-off valves.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

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

As shown in the figure, the oil hot water heater has a water heater main body 1, a water supply pipe 3 for supplying water from the water source to the hot water heater main body 1, and a heat exchange between the water heated in the water heater main body 1. It is constituted by a hot water supply pipe 5 for supplying the hot water to the hot water tap 11 via the heater 7. The water supply pipe 3 has a water inlet temperature sensor 23 for detecting the temperature Tc of water from the hot water supply source, the water quantity sensor 25 for detecting the amount of water Q, and the water supply pipe 5 has a water discharge temperature Th. A tapping temperature detection sensor 29 is provided. Further, a remote controller 33 for setting the set temperature Ts is provided. Further, the detection values Tc, Th,
There is also provided a control unit 31 for sending an operation / stop signal to the fan 9 for supplying a fixed amount of air necessary for combustion to the burner 15 from the pump from Q and Ts.

Further, an igniter 35 necessary for igniting is provided above the burner 15. Further, a fuel supply pipe 21 for supplying liquid fuel to the burner 15 is provided, and the fuel supply pipe 21 is provided with a pump P for starting / stopping the supply of the liquid fuel from the liquid tank 27.

FIG. 2 is a structural view showing an embodiment of the burner 15.

The burner 15 includes a core 13 and a liquid fuel passage 17. The liquid fuel supplied from the liquid fuel supply port at the distal end of the fuel supply pipe 21 is branched into a plurality of liquid fuels so as to reach the plurality of liquid fuel passages 17.
The liquid fuel supplied from the liquid fuel supply port reaches the wick 13 through the liquid fuel passage 17 and forms a flame above the wick 13. FIG. 5 is a sectional view taken along line AA of FIG.
Since the size (burning amount) of the flame burning at the top of the wick 13 is determined by the height and thickness of the wick 3, the height and the thickness of the wick 13 are all uniform so that the whole burns with the same flame doing. The air supplied from the fan 9 installed below the burner 15 is always supplied at a constant air volume from the space between the liquid fuel passages 17 in the direction of the arrow in the figure.

When the amount of fuel supplied from the liquid fuel supply port is small, the fuel is burned above the wick 13 near the liquid fuel supply port,
As the fuel supply increases, the core 1 of the entire burner 15
Since the fuel burns in the upper portion, the amount of combustion is adjusted by adjusting the fuel supplied from the fuel supply port to vary the area of the burning portion.

Next, the operation for actually burning will be described in detail.

When the hot water tap 11 is opened by the user,
The amount of water flowing through the water supply pipe 3 is the minimum ignition flow rate (for example, 2.0 liters).
/ Min) or more, and if the combustion amount calculated by the water amount Q flowing through the water supply pipe 3, the water temperature Tc, and the set temperature Ts is equal to or more than the ignition minimum combustion amount, the pump P operates and the liquid fuel supply port After the liquid fuel is supplied and a predetermined time has elapsed, the fuel is ignited by the igniter 35, and at the same time, the fan 9 operates so as to supply a constant air volume, and the combustion is started. Here, the predetermined time is an arbitrarily set time,
A time sufficient for the liquid fuel to reach the core near the igniter 35 is set. The pump P is
By changing the drive frequency or drive stroke,
The amount of fuel supplied from the liquid tank 27 is adjusted.

The control unit 31 detects the detected value T of each sensor.
The required combustion amount is calculated from the combustion amount calculated from c, Q and the set temperature Ts, and the corrected combustion amount calculated from the difference between the set temperature Ts and the tapping temperature Th. The amount of liquid fuel to be supplied to the burner 15 is determined from the calculated required amount of combustion, and when the required amount of combustion is small, a drive signal is output to the pump P so that the amount of liquid fuel supplied to the burner 15 is reduced. When the required combustion amount is large, a drive signal is output to the pump P so that the amount of liquid fuel supplied to the burner 15 increases. At this time, a drive signal is output to the fan 9 so that the amount of air supplied to the burner 15 is constant. By adjusting the liquid fuel supplied to the burner 15 in this manner, when the required combustion amount is small, the fuel burns at a constant flame above the wick 13 near the liquid fuel supply port, and when the required combustion amount is large. In order to burn with a constant flame above the core 13 of the entire burner 15, the controller 31 may output a drive signal to the fan 9 so that the amount of air supplied to the burner 15 is constant.

In order for the liquid fuel supplied from the fuel supply port to quickly and uniformly permeate the entire core 13, FIG.
In this case, as compared with the structure shown in FIG. 2, the core 13 permeates the core 13 far from the fuel supply port more quickly.

FIG. 3 is a structural view showing another embodiment of the burner 15.

FIGS. 1 and 2 show an embodiment in which a liquid fuel such as kerosene is used as the fuel. FIG. 3 shows a burner 15 in which a gaseous fuel such as gas or vaporized kerosene is used as the fuel. FIG. 1 and 2 will not be described below.

The fuel supply pipe 21 whose one end is connected to a fuel supply source (not shown) is branched so that the other end is connected to a plurality of burners provided with flame holes on the upper part. Is provided with a plurality of on-off valves 19 for supplying / stopping fuel to the burner. Further, the air supplied from the fan 9 installed below the burner 15 is always supplied from a plurality of burners with a constant air volume.

The controller 31 calculates the required amount of combustion in the same manner as described above, determines the amount of fuel to be supplied to the burner 15 based on the calculated required amount of combustion, and supplies the amount of fuel to the burner 15 when the required amount of combustion is small. The supply start signal is output to some of the on-off valves 19 so as to reduce the amount of fuel to run, and the on-off valves 19 open. Further, as the required combustion amount increases, the number of on-off valves 19 that output the supply start signal is increased so that the amount of liquid fuel supplied to the burner 15 increases. At this time, as described above, a drive signal is output to the fan 9 such that the amount of air supplied to the burner 15 is constant. By adjusting the fuel supplied to the burner 15 in this manner, when the required combustion amount is small, the combustion is performed with a fixed flame above the small number of burners, and when the required combustion amount is large, many burners are burned. Since the flame is burned with a constant flame at the upper part of the number of burners, the control unit 31 controls the fan 9 so that the amount of air supplied to the burner 15 is constant as in the embodiment of FIGS.
A drive signal may be output to the controller.

In FIG. 3, a description has been given of a configuration in which a plurality of on-off valves 19 for supplying / stopping fuel to / from a burner are provided. Alternatively, it is not necessary to provide a plurality of cylinder type rotary multi-way valves.

[Brief description of the drawings]

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

FIG. 2 is a structural diagram showing an embodiment of a burner 15;

FIG. 3 is a structural view showing another embodiment of the burner 15;

FIG. 4 is a structural view showing another embodiment of the burner 15;

FIG. 5 is a sectional view of one embodiment of the burner 15;

[Explanation of symbols]

 9 ... Fan 13 ... Core 15 ... Burner 17 ... Liquid fuel passage 19 ... On / off valve 21 ... Fuel supply pipe 31 ... Control unit 35 ... Igniter

Continuation of the front page (72) Inventor Yukitoshi Nagata 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Inside Totoki Kiki Co., Ltd. Inside Japan Yupro Corporation

Claims (7)

[Claims] 1. A combustion apparatus for controlling heating of a body to be heated by fuel and air, comprising: a heating body comprising a combustion section burning at a constant combustion amount; an ignition means for igniting the heating body; Air supply means for supplying a fixed amount of air to the heating element, a fuel supply path for supplying fuel to the combustion section, and a fuel provided in the fuel supply path, the fuel supply amount being varied according to a required combustion amount A combustion unit, comprising: a variable unit. 2. The combustion device according to claim 1, wherein the combustion section includes a fuel supply passage and a core.
A combustion device, wherein fuel is supplied to the fuel supply passage, and penetrates into the core and burns. 3. The combustion apparatus according to claim 1, wherein said fuel variable means is a fuel supply pump and varies a combustion amount by driving / stopping operation of said fuel supply pump. . 4. The combustion device according to claim 3, wherein the fuel supply pump is configured to increase as the required combustion amount increases.
A combustion device, wherein drive control is performed so as to supply a large amount of fuel to the combustion section. 5. A combustion device for controlling heating of an object to be heated with fuel and air, comprising: a combustion section comprising a plurality of burners burning at a constant combustion amount; an ignition means for igniting the combustion section; Air supply means for supplying a fixed amount of air to the combustion section, a fuel supply path for supplying fuel to the combustion section, and start / stop of fuel supply to the plurality of burners according to a required combustion amount And a fuel supply means for performing combustion. 6. The combustion apparatus according to claim 5, wherein said fuel supply means is an on-off valve for starting / stopping fuel supply to each of said plurality of burners. 7. The combustion apparatus according to claim 6, wherein the number of the on-off valves that open is increased as the required combustion amount increases.