JPH03279708A - Combustion controller of hot water supplier using gas - Google Patents

Abstract

PURPOSE:To shorten the time required for ignition and provide easy handling of a hot water supplier by providing near the burner a plurality of ignitors that ignite the gas jetted out of the burner at a position that is away from other burners. CONSTITUTION:A hot water supplier A that uses gas is provided with the combustion section B at the lower section and the heat exchanging section MC at the upper section of the inside of a case 1. The combustion section B is provided with a first burner b1 with four nozzles (n) and a second burner b2 with eight nozzles (n). Gas is supplied to a first burner b1 by opening a first change-over valve S1 to supply gas to a first burner b1 and ignite a first ignitor Ig 1 and the nozzle (n) on the outside end of the first burner b1 is ignited. The first moves along adjacent nozzles (n) successively to the inside to ignite all the nozzles (n) of the first burner b1. As soon as a second change-over valve S2 is opened t1, a second ignitor Ig 2 is fired, and by the ignition from the outside by the second ignitor Ig 2 and the transfer of fire from the inside by the first burner b1 the time T of ignition until the ignition completion t1 can be made shorter.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a combustion control device for a gas water heater.

(b) Conventional technology Conventionally, a combustor is composed of multiple burners with different calorific values that communicate with different gas passages, and it is necessary to adjust the amount of gas supplied to each burner, and to select and increase or decrease the number of burners to be combusted. There are gas water heaters that adjust the amount of heat generated.

When increasing the number of burning burners in order to increase the amount of heat generated, the burner is ignited by transferring the flame to the burner adjacent to the burning burner.

In addition, when switching combustion from a burner with a large calorific value to a burner with a small calorific value in order to reduce the calorific value, the flame is transferred from the burner with a large calorific value to the burner with a small calorific value. , then extinguish the burner that generates a large amount of heat,
Ignition is carried out by flame shifting, which continues combustion in a burner with a small calorific value, and in any case, switching of the burner for combustion is performed only by flame shifting ignition.

(c) Problem to be solved by the invention However, in the above-mentioned spark ignition, as shown in FIG. It takes a long time (To) to complete ignition (12') of the burner that starts combustion, and during this time, in order to stably ignite the burner, the amount of gas and air are kept constant. Since it is necessary to maintain the mixing ratio of air and gas at a constant air-fuel ratio (r') that is most likely to cause ignition, in the case of a hot water heater, the amount of heat generated during the time required for ignition (To), and ultimately the hot water temperature It has become impossible to control the hot water supply temperature, and the fluctuations in the hot water temperature during that time have become large, making the water heater extremely difficult to use.

Note that (Slo) is the solenoid valve that communicates with the burner that is already burning, and (32'') is the solenoid valve that communicates with the burner that will start combustion anew.The air-fuel ratio is adjusted using a proportional valve, fan, etc. be exposed.

(d) Means for Solving the Problems In the present invention, in a gas water heater equipped with a plurality of burners, a plurality of igniters for igniting gas ejected from the burners are placed near the burners at positions distant from other burners. It is an object of the present invention to provide a combustion control device for a gas water heater, characterized in that the device is installed in a gas water heater.

(E) Functions and Effects According to the present invention, by disposing an igniter near each burner, a new burner that starts combustion can be ignited by both the ignition method by the igniter and the ignition by the transfer of the flame. Since the ignition time is significantly shortened and the time required to maintain a constant air-fuel ratio is shortened, control of the hot water temperature can be started before the hot water temperature fluctuates significantly, resulting in improved hot water temperature control characteristics. This reduces fluctuations in the hot water temperature, making the water heater more convenient to use.

(f) Examples Embodiments of the present invention will be specifically described based on the accompanying drawings.

Figures 1 and 2 show a gas water heater (A), in which a combustion part (B) is arranged at the lower part of the inside of a substantially rectangular parallelepiped case (1), and a heat exchange part (110> is arranged at the upper part). .

The combustion part (B) has a combustion chamber (2) having a substantially rectangular cylindrical shape, and has four
A first burner (bl) having eight nozzles (n) and a second burner (b2) having eight nozzles (n) are arranged, and each burner (old) (b2) has an air chamber. (3) communicates with the fan (4), and each burner (old) (b2
) into the opening facing the air chamber (3), connect the gas supply pipe (5)
Each nozzle (n) communicating with the vana (n) faces each nozzle (n), and the gas supplied from the gas supply pipe (5) and the air from the air chamber (3) pressurized by the fan (4) are supplied to each vane (n). bl
) (b2) and each burner (old) (b2).
) is ejected into the combustion chamber (2) and combusted. (10) is an exhaust port.

The heat exchange part (IIC) includes a substantially rectangular cylindrical combustion cylinder (6), a water supply pipe (7) and a hot water outlet pipe (8) that penetrate the lower surface of the case (1).
The heat receiving tube (9) is wound around the lower outer peripheral surface of the combustion tube (6) from the water supply pipe (7) side, and then wrapped around the lower outer peripheral surface of the combustion tube (6). ), the combustion gas from the combustion chamber (2) heats the water flowing in the heat receiving pipe (9), and the hot water is sent from the hot water tap (8) to the gas water heater (^). It is designed to be discharged outside.

Figure 3 shows the connection between the nozzle (n) of each burner (old) (b2) and the waste supply pipe (5) and the ignition structure.
(pv) is a NONOVANAIMAJ proportional valve that adjusts the amount of gas supplied to the burner, (Sl,) (S2) is a valve that turns on and off the gas flow.
The first and second switching valves that turn off (old) (M2) are the first and second manifolds interposed between the gas supply pipe (5) and each nozzle (1]), (Igl) (1g2) are respectively 1st
, is an igniter disposed near the second burner (old) (b2), and the first igniter (Igl) is the igniter disposed near the second burner (old) (b2).
A second igniter (1g2) is provided near the second burner (b2) and at the opposite end of the first burner (b2). There is.

In addition, (Frl) (Fr2) are the first and second flame rods for detecting the combustion state of the nozzle, and are arranged between the first and second burners (old) (b2) toward the respective burners. has been done.

Figure 4 shows the configuration of the control device (C), which includes a microprocessor (MPU) and a human output interface (+
) (0) and memory (M), and the input interface (+) has a frame rod (Frl).
(Pr2), operation button (ml), water flow detector (m2)
, calorific value setting button (m3), hot water temperature detector ('rl
11) etc., and the output interface (0) is
1st and 2nd equniters (Igl) (1g2), main valve (s
O), the first and second switching valves (Sl) (S2), and the proportional valve with governor (Pv) are connected, and the memory (M) stores the program for controlling the water heater (A) described in 1. I'm letting you do it.

Figure 5 shows the operation unit (11) connected to the control device (C), in which operation buttons such as the operation button (ml), heat generation setting button (■3), and operation status indicator lights are arranged. There is.

During the above program, when igniting the first burner (old), open the first switching valve (Sl), supply waste to the first burner (old), ignite the first igniter (Igl),
Ignite the nozzle (n) at the outer end of the first burner (1)■),
Let the fire transfer to the adjacent nozzle (n) in the inward direction,
Ignite all nozzles (n) of the first burner (old).

In this state, four nozzles (n) are burning, and the gas water heater (A) has a calorific value (a to c in Fig. 6).
Gas can be combusted with a minimum calorific value to approximately 1/3 of the maximum calorific value.

After that, in order to increase the calorific value from the above state, the desired hot water temperature can be changed by increasing the amount of water supplied to the gas water heater (A) or by operating the calorific value setting button (m3). As shown in FIG. 7, when the second switching valve (S2) is opened (tl), the second igniter (1g2) is ignited and the igniter (1g2) is ignited from the outside, and the first burner is ignited from the outside. (old) fire transfer from the inside,
The ignition time (T) until ignition is completed (L2) can be shortened.

During this time, the proportional valve with governor (Pv) maintains the air-fuel ratio (') suitable for ignition, but as mentioned above, the second burner (b
2) is ignited from both sides, so the ignition time (T) becomes very short, and before the temperature of hot water from the gas water heater (A) fluctuates greatly, the air-fuel ratio is mixed and the hot water temperature control starts. can do.

In this state, 12 nozzles (n) are burning,
The waste water heater (A) can burn gas with a calorific value in the range df in FIG. 6 (approximately 172 of the maximum calorific value to the maximum calorific value).

From this state, if the first burner (bl) is extinguished, the second
The eight nozzles (n) of the burner (1>2) are burning, and the gas water heater (A) has a heat generation m in the range of Fig. 6 b - e (from about 174 of the maximum calorific value to the maximum calorific value of The gas can be combusted at approximately 273).

” 1, when switching combustion between burners with different numbers of combustion burners and different calorific values, the time when the hot water temperature control is in an uncontrolled state is short, so fluctuations in the hot water temperature are small, and gas hot water supply is possible. The usability of machine (A) can be improved.

[Brief explanation of drawings]

Fig. 1 is an overall front view of the gas water heater according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a schematic diagram showing the connection between the nozzle of each burner and the gas supply pipe and the ignition structure, and Fig. 4 is a schematic diagram showing the ignition structure. A block diagram showing the configuration of the control device, FIG. 5 is a front view of the operating section of the gas water heater, FIG. 6 is a graph showing the relationship between burner and heat generation amount, and FIG. 7 is a burner ignition time chart using the ignition device of the present invention. 1
・, Figure 8 shows the burner ignition time chart 1 with the conventional structure. (A): Gas water heater (1)l): 1st burner (b2): 2nd burner (Igl): 1st igniter (1g2) 2nd igniter

Claims (1)

[Scope of Claims] 1) In a gas water heater equipped with a plurality of burners, a plurality of igniters for igniting gas ejected from the burners are arranged near the burners at positions separated from other burners. A combustion control device for a gas water heater characterized by the following.