JP3215557B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus capable of safely setting a fuel amount.

[0002]

2. Description of the Related Art Conventionally, a burner, a gas proportional valve for controlling the amount of gas to the burner, a heat exchanger heated by the burner, and an upstream or downstream side of the heat exchanger are conventionally mounted. A gas flow control valve for controlling the flow rate through the heat exchanger, and a gas water heater or the like in which a gas secondary pressure can be set by a control means for controlling the minimum and maximum opening of the gas proportional valve. There is a device.

[0003] The gas secondary pressure (gas supply amount) is made variable by changing the opening of the gas proportional valve according to the required number.

[0004] The gas proportional valve is usually constituted by a direct-acting solenoid valve, and the opening of the valve can be varied by the value of a current supplied.

However, the gas proportional valve has a large individual difference in the characteristics of the opening degree of the valve with respect to the required number, and the control current value (valve opening degree) of the gas proportional valve depends on the variation in the pressure loss of the gas passage. The relationship of the gas secondary pressure differs for each proportional valve.

For the gas secondary pressure, for example, the minimum / maximum pressure of the required number of 2 to 24 is determined by actual measurement according to the gas proportional valve and the gas type.

Therefore, in order to set the predetermined minimum / maximum secondary pressure, the minimum / maximum opening of the gas proportional valve must be set for each type of gas and for each combustion device.

For example, when setting a predetermined maximum gas secondary pressure, the gas proportional valve is set to the maximum opening at the present time, and then adjusted to the predetermined maximum secondary gas pressure by the adjusting means described above. Then, when the gas proportional valve is at the maximum opening, a predetermined maximum gas secondary pressure is obtained.

[0009]

However, in the above technique, when the maximum gas secondary pressure is set, the gas proportional valve has the maximum opening, and the burner is forcibly in the maximum combustion state.

On the other hand, since the opening of the water flow control valve is controlled by the set temperature and the feed water temperature, when the flow of water to the heat exchanger is small, the water supplied in the heat exchanger is reduced. It could boil and was very dangerous.

An object of the present invention is to provide a combustion apparatus which can solve the above-mentioned problems.

[0012]

SUMMARY OF THE INVENTION The present invention provides a burner, a fuel control valve for controlling the amount of fuel supplied to the burner, a heat exchanger heated by the burner, an upstream side of the heat exchanger, or A water flow control valve mounted on the downstream side for controlling the flow rate through the heat exchanger, and further comprising a minimum and maximum opening of the fuel control valve and a minimum and maximum opening of the fuel control valve. In the combustion device, the fuel amount is adjusted by the adjusting means and the fuel control valve is initialized by the adjusting means, when the fuel amount corresponding to the maximum opening of the fuel control valve is initialized by the adjusting means, The present invention relates to a combustion device characterized in that the water flow control valve is fully opened and the water flow control valve is fully opened so that the flow of water to the heat exchanger is maximized.

The present invention also provides a burner, a fuel control valve for controlling a fuel amount to the burner, a heat exchanger heated by the burner, and a branch from an upstream side of the heat exchanger.
A bypass pipe communicating with the downstream side of the heat exchanger is provided, and the bypass pipe has a flow rate to the heat exchanger side,
At least one flow control valve for controlling a flow rate to a bypass side is attached, and further, a fuel amount can be set by adjusting means for adjusting a minimum / maximum opening of the fuel control valve. When setting the fuel control valve, the fuel control valve is fully opened, and the valve opening of the flow control valve is controlled so that the flow rate to the heat exchanger is maximized and the flow rate to the bypass side is minimized. It has a special feature.

[0014] The present invention is also characterized in that the flow control valve is a water flow control valve mounted in the middle of the bypass pipe.

Further, according to the present invention, the flow control valve is preferably provided with a branch valve attached to a start end of the bypass pipe branched from an upstream side of the heat exchanger and connected to a downstream side of the heat exchanger, or at a terminal end. Another feature is that it is an attached mixing valve.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on embodiments shown in the accompanying drawings. In the present invention, the combustion device will be described as a gas combustion device.

FIG. 1 is a conceptual illustration of a water heater B as a gas combustion apparatus A according to the present invention, and FIG.
5 is a flowchart at the time of setting the gas secondary pressure in FIG.

As shown in FIG. 1, a water heater B as a gas combustion device A includes a burner 1 and a heat exchanger 2 heated by the burner 1, and the gas supplied to the burner 1 , From the gas supply source 3 through the gas supply pipe 4
Supplied to

A gas solenoid valve 5 and a gas proportional valve 6 are arranged in series in the gas supply pipe 4.

In this embodiment, the gas solenoid valve 5 and the gas proportional valve 6 are the first gas solenoid valve 5a, the gas proportional valve 6, and the second gas solenoid valve from the upstream side with the gas supply source 3 as the upstream side. They are arranged in the order of 5b.

The arrangement of the plurality of gas solenoid valves 5a and 5b is as follows.
Even if one of them becomes malfunctioning and cannot shut off the gas, the other solenoid valve completely shuts off the gas to ensure safety.

The gas proportional valve 6 is provided with a valve mechanism for adjusting the gas flow rate in the main body, and is constituted by an electromagnetic type in which the valve is opened and closed by a current value supplied. Then, it has a function of adjusting the flow rate and pressure (primary gas pressure) of the supplied gas and keeping the flow rate and pressure (gas secondary pressure) of the gas at the discharge side at a constant set value.

The heat exchanger 2 has a large number of fins 8
The water absorption pipe 7 is connected to a water supply pipe 9 on the upstream side and a hot water supply pipe 10 on the downstream side. The hot water supply pipe 10 is provided with a tap water temperature detector S1 and a water flow control valve V for controlling the flow rate to the heat exchanger 2. On the other hand, the water supply pipe 9 has a water supply temperature detector S2 and a water flow detection valve. The container S3 is installed.

Further, the water heater B is provided with a controller C. The controller C includes a set tap water temperature Ts output from a remote controller (not shown), a feed water temperature Tc detected by a feed water temperature detector S2, and the like. The operation of the gas solenoid valve 5 and the gas proportional valve 6 is controlled based on detection signals such as a tapping temperature Th detected by the tapping temperature detector S1 and a flow rate Q detected by the water quantity detector S3.

The controller C in the present embodiment includes a calculating section C1 for calculating a required heat quantity based on the tap water setting temperature Ts, the feed water temperature Tc, the tap water temperature Th, and the water flow rate Q, and a calculation output from the calculating section C1. A drive current calculation unit C2 for directly calculating a drive current to the gas proportional valve 6 based on the above, and a combustion control unit C3 for performing other combustion control are provided.

Further, on the circuit of the controller C, a control board F as a means for adjusting the gas secondary pressure is provided.

The control board F includes a maximum / minimum gas pressure adjusting volume 21, 22 and a maximum / minimum gas pressure adjusting button 23, 24.
The control board F is used to perform initial setting of the gas secondary pressure at the time of production of the water heater B or at the time of maintenance of the gas passage components.

That is, the maximum / minimum gas pressure adjustment buttons 23, 2
4 Press and hold to set the gas proportional valve 6 to the maximum / minimum valve opening,
After stabilizing the combustion state of the burner 1, a pressure gauge H is attached to the gas secondary pressure detection port 18 shown in FIG. It is turned to adjust to a predetermined gas secondary pressure.

In FIG. 1, reference numeral 11 denotes a casing of a water heater B, 12 denotes an igniter arranged as an ignition device near the burner 1, 13 denotes a combustion fan for sending combustion air to the burner 1, and 14 denotes a hot water supply. A hot-water tap attached to the end of the pipe 9 is a water source connected to the water pipe 9.

The gist of the present invention is that, in the above-described gas combustion apparatus A, the control board F as a means for adjusting the secondary gas pressure initially sets the fuel amount corresponding to the maximum opening of the fuel control valve 6. In this case, the fuel control valve 6 is fully opened and the water flow control valve V is fully opened to control the water flow to the heat exchanger 2 to be maximum.

Here, the method of setting the gas secondary pressure will be described below with reference to the flowchart of FIG.

First, a pressure gauge H is attached to the gas secondary pressure detection port 18 of the manifold of the burner 1, and as shown in FIG. 2, the tapping set temperature Ts is set to the maximum (minimum) (101), and the hot water tap is set. 14
And open the bath (102). At the same time, burner 1 fires,
Stable eventually (103). At this time, of course, the maximum (minimum) number of heat load requests (for example, No. 24 (No. 2)) is made.

Next, the maximum (minimum) side gas pressure adjustment button
If the combustion state of the burner 1 is stabilized at the maximum (minimum) valve opening (105), the maximum (minimum) side gas pressure adjusting volume 21 (22) is checked while watching the pressure gauge H (104). )
The valve opening of the gas proportional valve 6 is set to the maximum (minimum) so as to reach a predetermined nominal maximum (minimum) gas secondary pressure (107).

When the controller C detects that the maximum (minimum) side gas pressure adjustment button 23 (24) has been pressed, the controller C outputs a drive signal to the water amount adjustment valve V to fully open the valve. (1
06). Accordingly, the water amount control valve V is fully opened, and the water flow amount Q to the heat exchanger 2 is maximized.

As described above, when the combustion is performed at the maximum (minimum) gas secondary pressure, the water flow amount Q to the heat exchanger 2 is maximized. Even so, water can be prevented from boiling.

In the present embodiment, the method for setting the gas secondary pressure has been described by manual operation, but this can also be performed by automatic control.

That is, in a gas combustion apparatus having a gas secondary pressure automatic adjustment mode or the like, in the automatic adjustment mode, it is sufficient to program in the controller C to fully open the water amount control valve V.

FIGS. 3, 4 and 5 show another embodiment which comprises a bypass pipe 30 which branches off from the upstream side of the heat exchanger 2 and communicates with the downstream side of the heat exchanger 2. ,
Water heaters B1, B2, and B3 each having at least one flow control valve attached to the bypass pipe 30 are shown.

The water heater B1 shown in FIG.
At the time of setting the gas secondary pressure, the water amount control valve V is fully closed so that all the feedwater flows to the heat exchanger 2 side, contrary to the previous embodiment. I have.
Also in this case, when the combustion is performed at the maximum (minimum) gas secondary pressure, the water flow amount Q to the heat exchanger 2 is set to be maximum. Even if it does, water can be prevented from boiling.

The water heater B2 shown in FIG.
A branch valve 31 is attached to the start end of the bypass pipe 30 that branches off from the upstream side of the heat exchanger 2 and communicates with the downstream side of the heat exchanger 2.

When setting the gas secondary pressure in this case, the branch valve
The bypass side 31 is fully closed and the heat exchanger 2 side is fully open.

Further, the water heater B3 shown in FIG. 5 has a mixing valve 32 attached to the end of the bypass pipe 30 branched from the upstream side of the heat exchanger 2 and connected to the downstream side of the heat exchanger 2. I have.

In this case, when setting the gas secondary pressure, the mixing valve
32 fully opens the heat exchanger 2 side and the hot water tap 14 side, and fully closes the bypass side. In these cases, similar effects can be obtained.

In FIG. 3, FIG. 4, and FIG. 5, S4 is a mixed hot water temperature detector, and other reference numerals are used for the same components as those in the previous embodiment.

As described above, the gas combustion device A has been described using a water heater, but any device that performs gas combustion, such as a fan heater, may be used, and is not limited to a water heater. Further, as long as the combustion must be performed with the maximum capacity for setting the degree of opening of the proportional valve, the present invention can be applied not only to gas but also to other fuels.

[0046]

The burner, a fuel control valve for controlling the amount of fuel to the burner, a heat exchanger heated by the burner, and a heat exchanger mounted on the upstream or downstream side of the heat exchanger Adjusting means for controlling the minimum and maximum opening of the fuel control valve and a predetermined amount of fuel corresponding to the minimum and maximum opening of the fuel control valve. In the combustion apparatus, the fuel control valve is fully opened when the fuel amount corresponding to the maximum opening of the fuel control valve is initially set by the adjusting means. Is fully opened to control the amount of water passing through the heat exchanger to a maximum, thereby preventing water from boiling in the heat exchanger. Therefore, a safe initial setting of the fuel amount becomes possible.

Further, even in a gas combustion device having a bypass flow path, a flow rate control valve is attached to the bypass flow path so that the flow rate to the heat exchanger side is maximized and the flow rate to the bypass side is maximized by the valve. Since the control is performed so as to be minimized, it is possible to prevent the boiling of water when setting the fuel amount also in this case.

[Brief description of the drawings]

FIG. 1 is a conceptual explanatory diagram of a water heater as a combustion device according to the present invention.

FIG. 2 is a flowchart at the time of setting a gas secondary pressure in the water heater.

FIG. 3 is a conceptual explanatory diagram of a water heater according to another embodiment.

FIG. 4 is a conceptual explanatory view of a water heater according to another embodiment.

FIG. 5 is a conceptual explanatory view of a water heater according to another embodiment.

[Explanation of symbols]

 A gas combustion device (combustion device) V water control valve 1 burner 2 heat exchanger 6 gas proportional valve (fuel control valve) 30 bypass pipe 31 branch valve 32 mixing valve

Continuation of the front page (72) Inventor Hidefumi Mitsunaga 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Co., Ltd. (56) References JP-A-1-111160 (JP, A) (58 ) Surveyed field (Int.Cl. ⁷ , DB name) F24H 1/10 302 F23N 5/14 370

Claims (4)

(57) [Claims] A burner (1), a fuel control valve (6) for controlling a fuel amount to the burner (1), a heat exchanger (2) heated by the burner (1), Upstream of the exchanger (2), or
A water flow control valve (V) mounted on the downstream side for controlling the flow rate through the heat exchanger; and
The maximum opening and the minimum and maximum opening of the fuel control valve (6)
A predetermined amount of fuel Tsu, in a combustion apparatus that initially set <br/> constant by adjusting the adjustment means, by the adjustment means, commensurate to the maximum opening degree of the fuel control valve (6)
When the fuel amount is initially set, the fuel control valve (6) is fully opened, and the water amount control valve (V) is fully opened,
(2) A combustion device wherein the amount of water flowing to the combustion device is controlled to be maximum. 2. A burner (1), a fuel control valve (6) for controlling a fuel amount to the burner (1), a heat exchanger (2) heated by the burner (1), A bypass pipe that branches from the upstream side of the heat exchanger (2) and communicates with the downstream side of the heat exchanger (2)
Along with (30), the bypass pipe (30) controls the flow rate to the heat exchanger (2) side and the flow rate to the bypass side,
At least one flow control valve is attached, and further, in a combustion device in which the fuel amount can be set by adjusting means for adjusting the minimum and maximum opening of the fuel control valve (6), when the fuel amount is set, While fully opening the fuel control valve (6), the valve opening of the flow control valve, the heat exchanger (2)
The combustion apparatus controls so that the amount of water flowing to the bypass side is maximized and the flow rate to the bypass side is minimized. 3. The combustion apparatus according to claim 2, wherein the flow control valve is a water flow control valve (V) mounted in the middle of the bypass pipe (30). 4. The flow control valve branches from an upstream side of the heat exchanger (1) and is attached to a start end of the bypass pipe (30) communicating with a downstream side of the heat exchanger (2). 3. The combustion device according to claim 2, wherein the combustion device is at least one of a valve (31) and a mixing valve (32) attached to the end.