JPH1194243A - Combustion device and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device capable of preventing occurrence of vibration sound. SOLUTION: In the case that a volume of gas required during combustion is increased, an air volume correcting part 51 outputs a corrected volume of air having a target air volume increased at a predetermined rate in respect to an increased volume of gas to an air volume controlling section 52. Also in the case that the corrected volume of air is fed to a burner and a volume of gas is rapidly increased during combustion, air does not produce any vibration caused by variation in heat generating speed and so it is possible to prevent occurrence of vibration sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus having a burner for burning gas, and having a blower for blowing a target air flow to the burner with respect to a required gas flow rate, and a control method therefor.

[0002]

2. Description of the Related Art At present, the cause of combustion noise is considered to be the sum of the vibration sound caused by the air vibrating due to the fluctuation of the heat generation rate and the vibration sound caused by the fluctuation of the gas flow. The main factor is speed fluctuation, that is, disturbance of the reaction. In some cases, the device container may start to resonate due to vibration of the gas due to heat generation. Furthermore, the fluctuations in the heat generation rate give fluctuating pressure to the walls of the device container, causing the walls to vibrate.Then, the vibrations of the walls in turn promote the fluctuations in the combustion speed, and the resonance effect of strengthening each other increases. appear.

[0003] As a conventional combustion device, for example, FF
In (feed-forward) control, after the burner is ignited, the target air flow with respect to the required gas amount (the target valve opening of the flow control valve) is increased to 110% for 5 seconds to eliminate the delay in the rise of the air volume and reduce the vibration. The generation of noise is suppressed, and the factor of combustion noise is eliminated.

[0004]

However, in such a conventional combustion apparatus, the vibration sound is not always generated after the burner is ignited, but the presence or absence of the vibration sound depends on the combustion conditions before the ignition. Also, during combustion, if the required gas amount increases and the rate of increase exceeds a certain value, if the target air flow according to the increased gas amount is sent, the vibration sound will be heard. There was a problem that it occurred. As a result of study focusing on this point, when the ignition of the burner or the amount of gas increases when the burner is at a high temperature, the so-called primary air and secondary air passing between the burners are caused by the thermal expansion of the burner. It has been found by experiments of the inventor of the present application that the pressure loss is considered to be insufficient, and resonance noise is likely to be generated due to the collapse of the air-fuel ratio. The present invention has been made in view of such a conventional problem, and it is possible to prevent the generation of a vibration noise after ignition of a burner or by preventing the generation of a vibration noise during combustion. It is an object of the present invention to provide a combustion device and a control method therefor.

[0005]

The gist of the present invention to achieve the above object lies in the following inventions. [1] In a combustion device having a burner (71) for burning gas and a blower (63) for blowing a target airflow for a required gas amount to the burner (71), the combustion device has an airflow The control unit (52) and the air volume correction unit (5
1), and the air volume control unit (52) includes the air blowing unit (6).
3) controlling the air volume, and the air volume correction unit (51)
Is configured to output, to the air volume control unit (52), a corrected air volume obtained by increasing the target air volume at a predetermined rate with respect to the increased gas volume when the gas volume required during combustion increases. Combustion equipment.

[2] A control method for a combustion apparatus having a burner (71) for burning gas and a blowing unit (63) for blowing a target air flow for a requested gas flow to the burner (71), When the amount of gas required during combustion increases, the air volume correction unit (51) outputs a corrected air volume obtained by increasing the target air volume to the increased gas volume at a predetermined rate to the air volume control unit (52). , The air volume control unit (52)
Controlling the air volume of the air blower (63).

[3] A combustion device having a burner (71) for burning a gas, wherein a target air flow for a required gas amount is blown to the burner (71). In the apparatus having a control section (55) and a gas amount increase limiting section (54), the gas amount control section (55) controls the valve opening of the flow rate control valve (75) to reduce the required gas amount. The gas amount increase limiting section (54) controls the gas amount to be equal to or less than a predetermined value when the rate of increase of the gas amount exceeds a certain value when the gas amount required during combustion increases. And controlling the combustion device according to [1] or the combustion device according to [2], wherein the limited amount of gas is output to the gas amount control unit (55). Method.

[4] a burner (71) for burning gas;
A flow control valve (75) for supplying a required amount of gas to the burner (71); and a blowing unit (63) for blowing a target air flow for the required gas amount to the burner (71). In the combustion device, the combustion device includes a combustion surface control unit (57), an air volume control unit (52), and an air volume correction unit (5).
1), wherein the burner (71) has two or more combustion surfaces, and the combustion surface control section (57) controls a part of the combustion surface in accordance with a required heat value. The gas switching valve (76) is controlled so as to switch between a partial combustion state in which the air is ignited and a full combustion state in which all the combustion surfaces are ignited, and the air volume control unit (52) controls the air volume of the air blowing unit (63). The air volume correction unit (51) determines that the full combustion state in which the valve opening of the flow rate control valve (75) is within a predetermined value continues for a predetermined time or more, and the combustion in the full combustion state When the elapsed time from the end to the start of combustion is within a predetermined time, a corrected air volume obtained by increasing the target air volume with respect to the gas volume at a predetermined ratio is output to the air volume control unit (52). Combustion equipment.

[5] a burner (71) for burning gas;
A flow control valve (75) for supplying an amount of gas required to the burner (71), wherein a target air flow for the required gas amount is sent to the burner (71); The combustion device has a combustion surface control unit (57) and a full combustion restriction unit (58). The burner (71) has two or more combustion surfaces, and the combustion surface control unit (57). ) Controls the gas switching valve (76) to switch between a partial combustion state in which some of the combustion surfaces are ignited and a full combustion state in which all of the combustion surfaces are ignited in accordance with the required heat value. In the full combustion state, when the valve opening of the flow control valve (75) exceeds a predetermined value in order to obtain the required calorific value, the full combustion limiter (58) performs the partial combustion. Full combustion for switching from the state to the full combustion state Combustion apparatus characterized by outputting a signal to the combustion surface control unit (57).

Next, the operation of the invention described in each of the above items will be described. In the combustion device according to the item [1], the air volume correction unit (51) includes:
When the amount of gas required during combustion increases, a corrected air volume obtained by increasing the target air volume with respect to the increased gas volume at a predetermined rate is output to the air volume control unit (52).

The air volume control section (52) controls the air volume of the air blow section (63) with the corrected air volume. Since the corrected air volume is sent to the burner (71), even if the gas volume increases suddenly during combustion, the air does not generate vibration due to fluctuations in the heat generation speed, and vibration noise is generated. Can be prevented.

[0012] In the method for controlling a combustion device according to item [2],
Similarly, since the blowing unit (63) blows the corrected air volume to the burner (71), even when the gas amount increases rapidly during combustion, the air does not vibrate due to a change in the heat generation speed. Vibration noise can be prevented from being generated.

[0013] In the combustion apparatus or the control method thereof according to the item [3], the gas amount increase limiting section (54) sets the gas amount increase rate to a constant value when the gas amount required during combustion increases. If it exceeds, the gas amount is limited to an increase rate equal to or less than a certain value, and the limited gas amount is output to the gas amount control unit (55). The gas amount control unit (55) controls the opening degree of the flow control valve (75) based on the limited gas amount.

[0014] The gas amount does not increase rapidly, the target air volume can follow the increasing gas amount without delay, the fluctuation of the heating speed is reduced, and the vibration noise caused by the rapid fluctuation of the heating speed is reduced. Can be prevented from occurring.

[0015] In the combustion apparatus described in the item [4], the combustion surface control section (57) controls the gas switching valve (76) to ignite a part of the combustion surface in accordance with a required calorific value. The state is switched between a partial combustion state and a full combustion state in which all combustion surfaces are ignited. The air volume correction unit (51) is configured to determine that the full combustion state in which the valve opening of the flow rate control valve (75) is within a predetermined value continues for a predetermined time or more, and that the combustion from the end of the full combustion state to the start of combustion When the time is within a predetermined time, a corrected air volume obtained by increasing the target air volume with respect to the gas volume at a predetermined rate is output to the air volume control unit (52).

The air volume control section (52) controls the air blowing section (63) based on the corrected air volume. Thereby, the blower (6
3) sends the corrected air volume to the burner (71), so that even if the gas volume increases rapidly during combustion, the air does not generate vibration due to fluctuations in the heat generation speed, and the generation of vibration noise is suppressed. Can be prevented.

[0017] In the combustion apparatus described in the item [5], the combustion surface control section (57) controls the gas switching valve (76) to ignite a part of the combustion surface in accordance with a required heat generation amount. The state is switched between a partial combustion state and a full combustion state in which all combustion surfaces are ignited. The full combustion limiter (58) switches from the partial combustion state to the full combustion state when the valve opening of the flow control valve (75) exceeds a predetermined value in order to obtain a required calorific value in the full combustion state. An overall combustion switching signal for switching is output to the combustion surface control section (57).

Thus, it is possible to prevent the burner (71) from rapidly rising to a high temperature, to suppress the generation of vibration noise due to vibration due to fluctuations in the heat generation rate, and to eliminate the factor of combustion noise.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a main part of a control unit of a combustion device according to the present invention. FIG. 2 shows a schematic configuration of the combustion apparatus according to the present invention.

As shown in FIGS. 1 and 2, the combustion apparatus is a one-can two-channel gas water heater, and includes a can (not shown) and a burner 71 housed in a lower part of the can. ,
It has a heat exchange section 72 housed in the upper part of the can and a blower section 53 which is a fan for supplying combustion air to the burner 71. The burner 71 has two combustion surfaces A and B.

The means for supplying gas to the burner 71 includes:
It has a gas pipe 73 and a main solenoid on-off valve 74 and a flow control valve 75 provided in the gas pipe 73, respectively.
The burner 71 has two combustion surfaces, and a gas switching valve 76 is provided for each combustion surface. Further, an ignition mechanism (shown) is arranged near the burner 71.

The burner 71 and the heat exchanging section 72 are commonly used for both the hot water supply piping system 10 and the additional heating piping system 20. That is, the heat exchange section 72 has a large number of thin fin plates 72a, and the fin plates 72a have a heat receiving pipe 11 which is a hot water supply pipe of the hot water supply piping system 10 and a reheating of the additional heating piping system 20. Heat receiving tubes 21 as water tubes are arranged in a penetrating state.

First, the hot water supply pipe system 10 will be described. A water supply pipe 12 of the hot water supply pipe system 10 is connected to an inlet end of the heat receiving pipe 11, and a hot water supply pipe 13 is connected to an outlet end thereof. A hot water tap 14 is provided at the end of the hot water supply pipe 13. Two bypass pipes 15 and 16 are provided between the water supply pipe 12 and the hot water supply pipe 13 in parallel with the heat receiving pipe 11. In FIG. 2, connection points between the bypass pipe 15 and the water supply pipe 12 and the hot water supply pipe 13 are indicated by reference numerals P1 and P2, respectively, and the bypass pipe 16 and the water supply pipe 12 and the hot water supply pipe 13 are shown.
Are indicated by reference numerals P3 and P4, respectively.

The bypass pipe 15 closer to the heat exchange section 72 is not provided with a valve or the like, and the water flowing through the water supply pipe 12
At the connection point P1, the heat receiving pipe 11 and the bypass pipe 12 are always separated at a fixed ratio (for example, 70:30). Then, they merge again at the connection point P2.

On the other hand, a first flow control valve GM2 is provided in the bypass pipe 16 which is faster from the heat exchange section 72. As the flow control valve GM2, for example, a gear motor drive type configured as follows is used. That is, the gear motor-driven flow control valve has an annular valve seat provided in the pipe, a valve body movable with respect to this valve seat,
A shaft has one end fixed to the valve body, and a motor connected to the other end of the shaft via a reduction gear train. The shaft is screwed to the valve case.

Therefore, when the motor rotates, the shaft moves in the axial direction, whereby the opening between the valve body and the valve seat can be changed. Therefore, the ratio between the amount of water flowing from the connection point P3 to the hot water supply pipe 11 and the amount of water flowing to the bypass pipe 16 can be changed as appropriate. Note that a flow control valve GM1 configured similarly to the flow control valve GM2 is also provided on the hot water supply pipe 13 between the connection points P2 and P4.

The hot water supply piping system 10 is provided with first and second two flow sensors FL1 and FL2. The first flow sensor FL1 is disposed in the water supply pipe 12 between the connection points P1 and P3, and the second flow sensor FL2
Is disposed on the hot water supply pipe 13 between the connection point P4 and the hot water tap 14.

The hot water supply piping system 10 is provided with four temperature sensors THin, THz, THout, and THmix. The temperature sensor THin is disposed in the water supply pipe 12 on the upstream side of the connection point P3, and detects the temperature of the water supply. The temperature sensor THz is arranged at a bend portion of the hot water pipe 11 and detects the temperature of water in the hot water pipe 11.

The temperature sensor THout is also provided with a hot water supply pipe 13 near the outlet of the hot water supply pipe 11, and detects the temperature of hot water flowing out of the hot water supply pipe 11. The temperature sensor THmix is arranged in the hot water supply pipe 13 downstream of the connection point P4, and detects the temperature of hot water flowing out of the water tap 14.

On the other hand, in the reheating pipe system 20, a return pipe 22 is connected between the inlet end of the heat receiving pipe 21 and the bathtub 77, and is connected between the outlet end of the heat receiving pipe 21 and the bathtub 77. Is connected to the outward pipe 23. The return pipe 22 has a pump 2
4. A temperature sensor THhr and a flowing water switch FS are provided. The temperature sensor THhr is connected to the return pipe 2 from the bathtub 77.
The temperature of hot water (or water) flowing into 2 is detected. Therefore, temperature sensor THhr substantially detects the temperature of hot water in bathtub 77.

Further, a temperature sensor THar
Is provided. The temperature sensor THar detects the temperature of hot water (or water) flowing from the outward pipe 23 to the bathtub 77. The running water switch FS is for detecting whether or not hot water is flowing in the return pipe 22.
When hot water is flowing inside, it is ON, and when it is not flowing, it is OFF. Running water switch F
When S is in the OFF state, the additional heating switch described later
Even if the N operation is performed, the burner 71 is not ignited.

Between the hot water supply pipe 13 of the hot water supply pipe system 10 and the return pipe 22 of the additional heating pipe system 20, a pouring pipe 30 for filling the bathtub 77 with hot water is provided. 30 are connected to hot water supply pipe 13 and return pipe 22 by reference numerals P5 and P6.
Indicated by The pouring pipe 30 is provided with a pouring valve 31 composed of an electromagnetic on-off valve.

The hot water supply apparatus further includes a control unit 5
0 and a remote controller 60. Detection signals from various detection units are input to the control unit 50. Here, temperature sensors THin, THz, THou
t, THmix, THhr, THar, flow sensor FL1,
Detection signals of FL2 and the flow switch FS are input. In the following, it is assumed that the same reference numerals as those of the detecting means are used for the detection signals of the detecting means. The control unit 50 controls the main electromagnetic on-off valve 74 and the flow control valve 75 of the gas supply means, the ignition mechanism, the fan, the flow control valves GM1 and GM2, the pump 24, and the pouring valve 31 based on each detection signal.

On the other hand, the remote controller 60 includes an operation switch, an automatic bath operation switch, a reheating switch, a temperature setting section, and a display section (none of them are shown). The temperature information is output to the control unit 50, and the information is displayed on the display unit. As described later, the display unit also displays error information from the control unit 50.

When hot water supply, additional heating, and automatic hot water filling are performed using the hot water supply apparatus having the above-described configuration, first, when hot water supply is performed, the operation switch of the remote controller 60 is turned off.
The state is set to the N state, and the hot water tap 14 is opened. Then, the control unit 50 controls the flow control valve 75 and the flow control valve G based on the set temperature, the water supply amount FL1, the water supply temperature THin, the hot water supply temperature THout, and the hot water supply amount FL2 supplied to the water supply pipe 12.
M1 and GM2 are controlled. As a result, hot water having a temperature equal to the set temperature is discharged from the tap 14.

The control of the flow control valve 75 and the like is the same as that of the conventional one and is not a main part of the present invention, so that the detailed description is omitted. This is the same for the subsequent reheating and automatic hot water filling. If there is a difference between the water supply amount FL1 and the hot water supply amount FL2 that is equal to or greater than a predetermined value, it is determined that there is a water leak in the pipe, and the burner 71 stops burning and the display unit displays an error. .

When performing additional heating, the additional heating switch of the remote controller 60 is turned on. Then, the pump 24 is activated first, and the hot water in the bathtub 77 circulates through the return pipe 22 and the outward pipe 23. When the flowing water switch FS detects the flow of the hot water in the return pipe 22, the burner 71 is ignited. Thereby, the hot water in the bathtub 77 is heated. When the detection signal from the temperature sensor THhr reaches the set temperature, the combustion of the burner 71 is automatically stopped, and the pump 24 is stopped.

When performing automatic hot water filling, the bath automatic operation switch of the remote controller 60 is turned on. Then, the injection valve 31 is opened, and the hot water heated in the hot water supply pipe 11 passes through the injection pipe 30 and is supplied to the bathtub 77 via the return pipe 22 and the forward pipe 23. Of course, so that the temperature of the hot water supplied to the bathtub 77 becomes the set temperature,
It is controlled by the control unit 50. And bathtub 7
When a predetermined amount of hot water accumulates in the bath 7, the pouring valve 31 is closed based on a greeting signal of a detecting means (not shown) for detecting the amount of water in the bathtub 77, and the combustion of the burner 71 is stopped. The hot water is over.

After the completion of hot water filling, a warming operation for maintaining the hot water in the bath tub at a substantially constant temperature is performed. During the heat retention operation, reheating is performed every predetermined time. That is, when a predetermined time has elapsed after the completion of hot water filling, additional reheating is performed automatically. Reheating at this time is the same as reheating when the reheating switch is turned ON. And the temperature TH of the hot water in the bathtub 77
When hr reaches the set temperature, the reheating is stopped and the burner 71 and the pump 24 are stopped until a predetermined time elapses again.

Here, the control unit 50 prevents the burner from becoming hot during combustion or immediately after the burner is ignited, and prevents the generation of vibration noise during combustion, thereby eliminating the generation of combustion noise. The function of controlling the air flow and the like is provided so that the configuration of a portion having the function is as shown in FIG. The relevant parts of the control unit 50 include an air volume correction unit 51, an air volume control unit 52, a blower unit 53 serving as a combustion fan, a gas amount increase restriction unit 54, a gas amount control unit 55, a valve opening detection unit 56, a combustion surface control unit. 57, whole-burn limiter 58
And is configured.

The air volume control unit 52 controls the rotation speed of the air blowing unit (not shown) to adjust the air volume blown to the burner 71.

The air volume correction unit 51 determines that the rate of increase in the required gas volume during combustion (determined from the valve opening of the flow control valve 75 in the combustion state) is a constant value (20% / 0.1).
When s) is exceeded, the target air flow with respect to the gas amount is corrected to the corrected air flow (for example, 110% of the target air flow for 3 seconds).

The air volume correction unit 51 includes a flow control valve 75
The full combustion state where the valve opening degree is within a predetermined value (30%) continues for a predetermined time (5 minutes) or more, and the elapsed time from the end of combustion of the full combustion state to the start of combustion is a certain time ( If the time is within 10 minutes, the correction air volume (for example, 113% of the target air volume is increased by 15% for 15 seconds) to the target air volume with respect to the gas volume is output to the air volume control unit 52.

The gas amount control unit 55 is a drive circuit for the flow control valve 75, and controls the valve opening of the flow control valve 75 to control the required gas amount.

The gas amount increase restricting section 54 controls the gas amount when the gas amount required during combustion increases and the rate of increase of the gas amount exceeds a certain value (20% / 0.1 s). The rate of increase is limited to a certain value or less, and the limited amount of gas is output to the gas amount controller 55.

The combustion surface control unit 57 ignites a partial combustion state (one of the combustion surfaces A and B) in which some of the combustion surfaces are ignited, and ignites all of the combustion surfaces in accordance with the required heat value. The gas switching valve 76 is controlled to switch to the full combustion state (both combustion surfaces A and B).

In the full combustion state, when the valve opening of the flow control valve 75 exceeds a predetermined value (for example, 29%) in order to obtain a required calorific value in the full combustion state, the partial combustion state And outputs to the combustion surface control unit 57 a full combustion switching signal for switching to the full combustion state. FIG. 3 shows the relationship between the required heat value (number) and the valve opening of the flow control valve 75.

When the temperature of the burner 71 becomes high, vibration noise is generated, and the possibility of generating combustion noise increases. In order to prevent such a problem, the control unit 50
The following control is executed. This control will be described with reference to the flowchart shown in FIG.

First, the operation switch is turned on / off by the remote controller 60, and the hot water supply temperature and the bath temperature are set. The required number G is obtained by the following equation.

G = (Tr−Tw) Q / 25 where, Tr: set temperature, Tw: incoming water temperature (° C.), Q:
The amount of water (l / min).

In the operation mode, it is determined whether or not gas is burning (step S101). If it is not burning, it is repeatedly determined whether or not burning has started (step S102). When the combustion is started, it is determined whether the elapsed time from the completion of a predetermined full combustion state (combustion state in which the state in which the valve opening is 30% or less continues for 5 minutes or more) to the start of combustion is within 10 minutes. A determination is made (step S103). If it is within 10 minutes, the target air volume according to the required gas volume is corrected to the corrected air volume (113% of the target air volume) (step S).
104). The main storage unit (not shown) records the combustion state at the end of combustion, and the timer circuit counts the elapsed time from the end of combustion.

The blower 53 blows the corrected airflow to the burner 71 for 15 seconds after ignition (step S105). on the other hand,
If the elapsed time exceeds 10 minutes even in the predetermined full combustion state or in the predetermined full combustion state, the blower 53 blows the target air volume (step S10).
6).

If it is determined in step S101 that combustion is occurring, it is repeatedly determined whether there is a request to increase the gas amount (step S107). Next, it is determined whether the gas amount is to be restricted (step S108).

If the gas amount is not limited, it is determined whether the valve opening of the flow control valve 75 exceeds a predetermined value (29%) in the entire combustion state (step S109). If it exceeds the predetermined value, the state shifts to the full combustion state, and the target air volume is corrected as necessary (step S110). If it does not exceed the predetermined value, the partial combustion state is maintained, and if necessary, the target air volume is corrected (step S115). Thereby, burner 7
The so-called full MIN combustion in which the temperature inside 1 becomes high can be avoided.

On the other hand, in step S108, when the gas amount is restricted, the rate of increase of the gas amount is a fixed value (20% /
0.1 s) (Step S11)
1). When the gas amount exceeds the fixed value, the gas amount control unit 55 controls the flow control valve 75 so as to limit the gas amount to the fixed value or less (step S112). The limited amount of gas is supplied to the burner 71 (step S113). On the other hand, if the rate of increase of the gas amount does not exceed the coincidence value, the requested gas amount is supplied without restriction (step S11).
4).

That is, by performing the air volume correction and the gas volume restriction, it is possible to reduce the possibility of generating the vibration noise and the possibility of generating the combustion noise by minimizing the condition for raising the temperature in the burner 71. Can be.

In the above embodiment, the target air volume is corrected as needed at the start of combustion (steps S102 to S106). However, the gas volume may be limited, In the step (1), the correction of the target air flow and the gas flow restriction are performed separately (step S1).
07 to S115), the correction may be performed simultaneously with the correction of the target air volume and the restriction of the gas volume.

In addition, when the gas amount is increased, the correction air volume (113% of the target air volume), which is a predetermined ratio of the target air volume, is corrected, but the predetermined ratio is 1% of the target air volume.
Instead of a fixed ratio such as 13%, the ratio may be changed from 113% to 100% within a predetermined time, for example.

The present invention may be applied to a semi-Bunsen type burner, or to a light / dark burner without secondary air. This is because the light burner is effectively a secondary air passage.

The present invention can also be used for a system in which the number of rotations of the fan is fed back by the rotation of the Hall IC. However, other than that, the output of the wind speed sensor used in parallel with the burner is increased by the heat generated by the burner. Therefore, until the burner pressure loss rise due to the heat generated by the burner stops, the output of the wind speed sensor can be kept low or the output target of the wind speed sensor can be set high to take measures against resonance noise.

[0061]

As described above, claims 1 and 2
According to the present invention, when the gas amount required during combustion increases, the air volume correction unit outputs to the air volume control unit a corrected air volume obtained by increasing the target air volume with respect to the increased gas volume at a predetermined rate. Therefore, even when the corrected air volume is sent to the burner and the gas volume increases rapidly during combustion, the air does not vibrate due to fluctuations in the heat generation speed,
Vibration noise can be prevented from being generated.

According to the third aspect of the present invention, the gas amount increase restricting unit reduces the gas amount when the rate of increase of the gas amount exceeds a certain value when the gas amount required during combustion increases. Since the limited gas amount is output to the gas amount control unit by limiting the increase rate to a certain value or less, the gas amount does not increase rapidly, and the target air volume is delayed with the increasing gas amount. Therefore, the fluctuation of the heat generation speed can be reduced, and the generation of the vibration sound caused by the rapid fluctuation of the heat generation speed can be prevented.

According to the fourth aspect of the present invention, the air volume correction unit determines that the full combustion state in which the valve opening of the flow rate control valve is within the predetermined value continues for a predetermined time or more, and that the combustion in the full combustion state ends. When the elapsed time from the start of combustion to the start of combustion is within a certain period of time, a corrected airflow in which the target airflow with respect to the gas flow is increased at a predetermined rate is output to the airflow control unit. Therefore, even if the amount of gas suddenly increases during combustion, the air does not generate vibration due to a change in the heat generation rate, and the generation of vibration noise can be prevented.

According to the fifth aspect of the present invention, the full combustion restricting unit is configured to perform the partial combustion when the valve opening of the flow control valve exceeds a predetermined value in order to obtain a required heat generation amount in the full combustion state. Since the full combustion switching signal for switching from the combustion state to the full combustion state is output to the combustion surface control unit, it is possible to prevent the burner from rapidly rising to high temperature and generate vibration due to fluctuations in the heat generation rate. The generation of the vibration noise due to the combustion noise can be suppressed, and the factor of the combustion noise can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of a control unit of a combustion device according to one embodiment of the present invention.

FIG. 2 is a conceptual diagram of a combustion device according to one embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between the number and the opening degree of a flow control valve in the combustion apparatus according to one embodiment of the present invention.

FIG. 4 is a flow chart of reheating control of the combustion device according to one embodiment of the present invention.

[Explanation of symbols]

 THhr, THar: Temperature sensors FL1, FL2: Flow sensors 10: Hot water supply piping system 11: Heat receiving tube 17: Check valve 18: Overpressure relief valve (blow valve) 20: Reheating piping system 21: Heat receiving tube 50: Control unit Reference numeral 51: Air volume correction unit 52 ... Air volume control unit 53 ... Blow unit 54 ... Gas amount increase restriction unit 55 ... Gas amount control unit 56 ... Valve opening detection unit 57 ... Combustion surface control unit 58 ... Entire combustion restriction unit 60 ... Remote controller Reference numeral 71: burner 72: heat exchange section 74: main solenoid on-off valve 75: flow control valve 76: gas switching valve 77: bathtub

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuya Wada 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Tsuyoshi Inoue 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Gaster Co., Ltd.

Claims (5)

[Claims] 1. A combustion apparatus comprising: a burner for burning gas; and a blower for blowing a target airflow for a required gas amount to the burner, wherein the combustion apparatus includes an airflow control unit and an airflow correction unit. The air volume control unit controls the air volume of the air blowing unit, and the air volume correction unit determines the target air volume for the increased gas volume when the gas volume required during combustion increases. And outputting a corrected air volume increased by the ratio of the air volume to the air volume control unit. 2. A method for controlling a combustion apparatus, comprising: a burner for burning gas, and a blower for blowing a target airflow to the burner with respect to a requested gas amount, wherein the gas amount required during combustion increases. In this case, the air volume correction unit outputs a corrected air volume obtained by increasing the target air volume to the increased gas volume at a predetermined rate to the air volume control unit, and the air volume control unit controls the air volume of the air blowing unit. A method for controlling a combustion device, which is characterized by the following. 3. A combustion apparatus having a burner for burning gas, wherein a target air flow for a required gas flow is blown to the burner, wherein the combustion apparatus has a gas flow control section and a gas flow increase restriction. Wherein the gas amount control unit controls the valve opening degree of the flow control valve to control the required gas amount, and the gas amount increase restriction unit is required during combustion. When the rate of increase of the gas amount exceeds a certain value when the gas amount increases, the gas amount is limited to an increase rate of a certain value or less, and the limited gas amount is output to the gas amount control unit. The method for controlling the combustion device according to claim 1 or the method for controlling a combustion device according to claim 2, characterized in that: 4. A burner for burning gas, a flow control valve for supplying a gas amount required for the burner, and a blower for blowing a target air flow for the required gas amount to the burner. In the combustion device, the combustion device includes a combustion surface control unit, an air volume control unit, and an air volume correction unit; the burner has two or more combustion surfaces; Depending on the amount of heat generated, the gas switching valve is controlled to switch between a partial combustion state in which some combustion surfaces are ignited and a full combustion state in which all combustion surfaces are ignited. The air volume of the blower is controlled, and the air volume corrector is configured such that the full combustion state in which the valve opening of the flow rate control valve is within a predetermined value continues for a predetermined time or more, and after the completion of the combustion in the full combustion state When the elapsed time from the start of combustion to the start of combustion is constant If within it, a combustion device and outputting a correction air amount was increased to the target air volume for the gas quantity at a predetermined ratio of the air volume control unit. 5. A combustion apparatus comprising: a burner for burning gas; and a flow control valve for supplying a required amount of gas to the burner, wherein a target air flow for the required amount of gas is blown to the burner. In the above, the combustion device has a combustion surface control unit and a full-surface combustion restriction unit, the burner has two or more combustion surfaces, and the combustion surface control unit has a required heat generation amount. Accordingly, the gas switching valve is controlled to switch between a partial combustion state in which some combustion surfaces are ignited and a full combustion state in which all combustion surfaces are ignited. In the case where the valve opening of the flow rate control valve exceeds a predetermined value to obtain the required heat generation amount, a full combustion switching signal for switching from the partial combustion state to the full combustion state is provided in combustion surface control. Output to the unit And combustion equipment.