JPH07217876A - Method for controlling combustion device - Google Patents

Abstract

PURPOSE:To provide a method for controlling a combustion device comprising a combustion device for feeding hot water to be used in a heat exchanger for feeding hot water and a combustion device for a bath to be used in a heat exchanger for additional boiling of bath by a method wherein a probability of explosion type ignition at the time of reignition at the combustion device is reduced and further there is no inconvenience in which the heating of the hot water feeding is stopped once during the hot water feeding. CONSTITUTION:In the case that poor ignition and diminishing of flame during operation occur at a combustion device 20 for feeding hot water, combustion is once stopped even during the combustion operation at a combustion device 50 for a bath, a gas purging is carried out at both combustion devices 20 and 50, thereafter the reignition is carried out. In turn, in the case that poor ignition and diminishing of flame during operation occur at the combustion device 50 for a bath and further in the case that the combustion device 20 for feeding hot water is in the combustion operation, the reignition of the combustion device 50 for the bath is carried out without stopping the combustion operation of the combustion device 20 for the hot water feeding operation as it is and without performing any gas purging operation of the combustion device 50 for the bath and at the same time in the case,that the combustion device 20 for feeding hot water stops combustion, the gas purging is carried out at both combustion devices 20 and 50, thereafter the reignition is carried out.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for controlling a combustor.

[0002]

2. Description of the Related Art Conventionally, in a combustor of a heat exchanger for hot water supply in an appliance having only a function of supplying hot water, when the combustor causes poor ignition or extinguishing on the way, unburned gas is discharged to the outside of the appliance. There is provided a control method in which the gas is purged once to perform the re-ignition operation. Further, also in the combustor of the bath heat exchanger in the appliance having the function of bath reheating alone, the same control method as in the case of the combustor of the hot water supply heat exchanger is provided.

[0003]

However, in the case of an appliance having both a hot water supply function and a bath reheating function, when the combustor of one of the heat exchangers causes poor ignition or mid-extinction. Even if the control method in the device having the single function is simply applied as it is, the control is not always preferable. For example, since combustion in one combustor affects the ignition operation of the other combustor, there is a problem of explosive ignition such as short cycle due to flame or heat of the other combustor during re-ignition. Also, when the combustion of both combustors is always temporarily stopped due to poor ignition or extinction in the other combustor, the operating function of the combustor on the normal combustion side is impaired during that time. There's a problem.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art and provides a combustor including a hot water supply combustor used for a hot water heat exchanger and a bath combustor used for a bath reheating heat exchanger. An object of the present invention is to provide a combustor control method capable of reducing the possibility of explosive ignition at the time of re-ignition of a combustor, and having no inconvenience that heating of hot water for hot water supply is temporarily stopped during hot water supply.

[0005]

In order to achieve the above object, a method of controlling a combustor according to the present invention is a hot water supply combustor used in a hot water heat exchanger and a bath used in a bath reheating heat exchanger. In the control method for a combustor consisting of a hot water combustor, if the hot water supply combustor suffers from poor ignition or extinguishing in the middle, combustion is temporarily stopped even if the bath combustor is in combustion operation. After the gas is purged in the combustor, the re-ignition operation is performed.On the other hand, if the bath combustor has a poor ignition or extinguishing in the middle, if the hot water supply combustor is in combustion operation, the hot water supply combustor Re-ignition operation of the bath combustor was performed without stopping the combustion operation and without performing gas purging of the bath combustor, and gas purging was performed in both combustors when the hot water supply combustor was stopped. Afterwards It is characterized in that to perform the operation.

[0006]

When the ignition failure or the extinction of flame occurs in the hot water supply combustor, if the bath combustor is in the combustion operation, the combustion is stopped. Then, after gas purging is performed in both the hot water supply combustor and the bath combustor, re-ignition operation is performed in both combustors. By doing so, unburned gas is discharged from both combustors, and explosive ignition is not performed at the time of reignition, and safe reignition is secured. If the combustion of the bath combustor is not stopped, the fire from the bath combustor may ignite on the hot water supply combustor side, resulting in explosive ignition. When the bath combustor is ignited poorly or the flame is extinguished midway, in this case, if the hot water supply combustor is in the combustion operation, the combustion operation of the hot water supply combustor is continued. Then, in the bath combustor, the re-ignition operation is performed without performing the gas purging. In this case, the possibility of explosive ignition in the bath combustor cannot be reduced by continuing the combustion operation in the hot water supply combustor, but the hot water for hot water supply is primarily cold water. It is possible to prevent the occurrence of a large inconvenience such as a situation. In addition, since gas purging is not performed in the bath combustor, instability of the blast state used for combustion on the hot water supply combustor side is also prevented by the air blowing for gas purging in the bath combustor, and stable Combustion continues.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of an apparatus showing an embodiment of the method of the present invention, and FIG. 2 is a flow chart showing an embodiment of the method of the present invention.

In FIG. 1, reference numeral 10 denotes a hot water supply heat exchanger, and a hot water supply combustor 20 is provided at a lower position inside the hot water supply heat exchanger 10. Further, a water exchange pipe 32 for heat exchange is arranged above the inside of the heat exchanger 10 for hot water supply. When the hot water supply combustor 20 is combusted, the water from the water inlet pipe 31 is heated while passing through the heat exchange water passage pipe 32, and is discharged to the hot water discharge pipe 33 for use. Reference numeral 34 is a water amount sensor, 35 is an incoming water temperature sensor, 36 is an overflow prevention device, 37 is a hot water supply temperature sensor, and 38 is a bypass pipe. A part of the hot water from the hot water outlet pipe 33 passes through the bath hot water supply pipe 39 and is piped to the bathtub 1 side. A bath reheating heat exchanger 40 is provided for the bathtub 1. A bath combustor 50 is provided below the bath reheating heat exchanger 40. The water in the bathtub 1 is heated by being reheated by circulating in the bath reheating heat exchanger 40 through the circulation path 1a. 61 is a pump for forced circulation, and 62 is a pipe for forced circulation. The bath hot water supply pipe 39 is connected to the bathtub 1 via a bath reheating heat exchanger 40 so that hot water can be supplied.

The hot water supply heat exchanger 10 is provided with a hot water supply fan 11 below the hot water supply combustor 20, and an exhaust port 12 is provided at the ceiling of the hot water supply heat exchanger 10. The exhaust port 12 has an exhaust passage common to the exhaust port 42 provided at the ceiling of the bath-exchanging heat exchanger 40, and exhausts exhaust gas to the outside. The hot water supply combustor 20
For the above, an igniter 21 and a flame detector 22 are provided. On the other hand, a bath fan 41 is provided on the ceiling of the bath reheating heat exchanger 40 together with the exhaust port 42.
An igniter 51 and a flame detector 52 are also provided for the bath combustor 50.

The hot water supply combustor 20 and the bath combustor 50
Is supplied with fuel gas. The fuel gas is divided from the main gas pipe 70 into a hot water supply gas pipe 71 and a bath gas pipe 72,
Each is supplied to the hot water supply combustor 20 and the bath combustor 50. Reference numeral 73 is an original gas solenoid valve, 74 is a hot water supply gas proportional valve, 75 is a capacity switching solenoid valve, 76 is a bath gas solenoid valve, and 77 is a bath gas governor.

Reference numeral 80 denotes a controller, which is instructed by one or a plurality of remote controllers 90 and each sensor provided in the instrument.
Based on the information from 22, 34, 35, 37, 52, etc., a predetermined control command is output to each part of the instrument. Now, when the switch for hot water supply by the remote controller 90 is turned on, when the water supply sensor is opened and the water amount sensor 34 detects the minimum operating water amount or more, the hot water supply fan 11 and the bath water are supplied via the controller 80. Both of the fans 41 are rotated at a constant prepurge rotation speed, and when a fixed prepurge time has elapsed, only the igniter 21 on the hot water supply side is turned on, the valves 73 and 74 are subsequently opened, and the capacity switching solenoid valve 75 A part of is opened and the hot water supply combustor 20 is ignited. When the flame detector 22 detects this ignition,
Further, the capacity switching solenoid valve 75 and the hot water supply fan 11 are controlled so that the hot water supply capacity set by the remote controller 90 is achieved, the gas flow rate and the air flow rate are adjusted, and the combustion operation is performed. When the water amount sensor 34 detects less than the minimum operating water amount by closing the hot water supply curran, the controller 80 closes the valves 73, 74 and 75, and controls both the hot water supply fan 11 and the bath fan 41 to a fixed position. Constant post-purge time with purge speed,
Perform post-purge operation. On the other hand, when the bath temperature is set by the remote controller 90 and the bath reheating operation is instructed, first, both the bath fan 41 and the hot water supply fan 11 are rotated at a constant pre-purge rotation speed via the controller 80, When a certain pre-purge time has elapsed, only the igniter 51 on the bath side is turned on, and then the gas solenoid valves 73 and 76 are opened to ignite the bath combustor 50. When the bath temperature reaches the set temperature, the controller 80 closes the gas solenoid valves 73 and 76, and performs the post-purge operation of the bath fan 41 and the hot-water supply fan 11 with a constant post-purge time at a constant post-purge rotation speed. , Post-purge ends.

Next, a control method by the controller 80 in the case where there is ignition failure or extinguishing in the middle of combustion in the hot water supply combustor 20 and the bath combustor 50 will be described with reference to FIG. In FIG. 2, when the ignition failure or the midway extinction occurs on the hot water supply side, that is, the hot water supply combustor 20 at the start of operation or during operation (Yes in step S1),
The controller 80 that inputs the information from the flame detector 22
First, when the bath side, that is, the bath combustor 50 is burning, this burning is also stopped (step S2). Then, both the fans 11 and 41 of both the hot water supply combustor 20 and the bath combustor 50 have a constant gas purge rotational speed (for example, the rotational speed corresponding to the maximum combustion in the respective combustors 20 and 50).
To start the gas purge (step S3). When a certain gas purge time, for example, a short time of about 2 seconds or more has passed (YES in step S4), the controller 80 determines whether or not there is a combustion command for the hot water supply combustor 20 (step S5), In this case, the process proceeds to step S6, the gas purge is terminated (S6), and the re-ignition operation of the hot water supply combustor 20 is commanded (S7). In this case, of course, if there is a combustion command for the bath combustor 50, the re-ignition operation is also commanded. If NO in step S5, the process proceeds to step S8, and after performing gas purging for a certain period of time, for example, about 10 seconds which is longer than that in step S4 (YES in step S8), perform gas purging. It ends (step S9). Also in this case, if there is a combustion command in the bath combustor 50, the re-ignition operation is started (step 10). Note that steps S4, S5,
In the flow of S6, when there is a combustion command to the hot water supply combustor 20, it is necessary to shift to the re-ignition operation of the hot water supply combustor 20 with a short gas purge time of about 2 seconds.
This is because the time during which the heating of the hot water is stopped is minimized, and for this reason the gas purge time is kept to the minimum required time.

Next, when the ignition failure or the midway extinction occurs on the bathtub side, that is, the bath combustor 50 at the start of operation or during operation (Yes in step S11), the information is notified from the flame detector 52. The input controller 80 first determines whether or not the hot water supply side, that is, the hot water supply combustor 20 is burning (step S12), and when the hot water supply combustor 20 is burning (YES in step S12), The re-ignition operation of the bath combustor 50 is performed without stopping the combustion of the hot water supply combustor 20 and without performing the gas purging of the bath combustor 50 (step S17). This is a hot water combustor 20
This is because if the combustion of is temporarily stopped, hot water having a low temperature will be supplied during that time, so that it is prevented. In step S12, if the hot water supply combustor 20 is not burning (NO in step S12)
In addition, the controller 80 raises both the hot water supply fan 11 and the bath fan 41 to a constant gas purge rotation speed (for example, the rotation speed corresponding to the maximum combustion in the respective combustors 20 and 50) to perform the gas purge. Start (step S13). When a certain gas purge time, for example, a short time of about 2 seconds or more has passed (YES in step S14), the controller 80 determines whether or not there is a combustion command to the bath combustor 50 (step S15), and YES (step S15). If YES in step 15, the process proceeds to step S16, the gas purge is terminated (S16), and the re-ignition operation of the bath combustor 50 is commanded (S17). Step S15
If there is no combustion command to the bath combustor 50 (NO in step 15), the process proceeds to step S18, and the gas purging is continued for a certain period of time, for example, about 10 seconds, which is longer than that in step S14. After that (Yes in step S18), the gas purge is completed (step S1).
9).

In steps S14 and S18, before the gas purge is completed (NO in step S14, step S18
If there is a combustion command to the hot water supply combustor 20 (NO in step S20) (YES in step S20), the gas purge is immediately terminated even during gas purging (step S6), and the hot water supply combustor 20 is re-ignited. Perform the operation (step S
7). That is, the combustion for the hot water supply operation is given the highest priority so that the hot water is not supplied even if the cold water or the like is primary.

[0015]

According to the combustor control method of the present invention, which has the above-described structure and operation, the hot water supply combustor can be used for a bath when the ignition failure or the extinction on the way occurs. Even if the combustor is in the combustion operation, the combustion is stopped once, and the re-ignition operation is performed after performing the gas purging in both combustors. Therefore, the re-ignition is performed in the state where unburned gas is excluded in both combustors. Therefore, it is possible to solve problems such as explosion and ignition. On the other hand, if the bath combustor has poor ignition or extinguishing during the bath, if the hot water supply combustor is in the combustion operation, the hot water supply combustor is not stopped and the bath combustor is not stopped. Since the re-ignition operation of the bath combustor is performed without performing the gas purging, it is possible to prevent the hot water supply temperature from temporarily lowering during hot water supply. Further, since the operating state of the bath combustor does not shift to the gas purging operation, stable hot water supply can be continued without being adversely affected. If the bath combustor has poor ignition or extinguishing in the middle, and if the hot water supply combustor is not in combustion operation, re-ignition operation is performed after gas purging in both combustors. Re-ignition can be performed in the combustor in a state where unburned gas is removed, and problems such as explosive ignition can be solved. As described above, according to the method of the present invention, in the combustor composed of the hot water supply combustor used in the hot water supply heat exchanger and the bath combustor used in the bath reheating heat exchanger, It is possible to reduce the possibility of explosive ignition at the time of ignition, and it is also possible to eliminate the inconvenience that heating of the hot water supply is temporarily stopped during hot water supply.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus showing an embodiment of a method of the present invention.

FIG. 2 is a flowchart showing an embodiment of the method of the present invention.

[Explanation of symbols]

 1 Bath 10 Heat exchanger for hot water supply 11 Fan for hot water supply 20 Combustor for hot water supply 40 Heat exchanger for bath reheating 41 Bath fan 50 Combustor for bath 80 Controller 90 Remote control

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuki Takeda 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (1)

[Claims] 1. A control method for a combustor comprising a hot water supply combustor used for a hot water supply heat exchanger and a bath combustor used for a bath reheating heat exchanger, wherein the hot water supply combustor is ignited. In case of failure or extinguishing on the way,
Even when the bath combustor is in combustion operation, the combustion is temporarily stopped,
After performing gas purge in both combustors, re-ignition operation is performed.On the other hand, when the bath combustor has poor ignition or extinguishing in the middle, if the hot water supply combustor is in combustion operation, it is the hot water supply combustor. Re-ignition operation of the bath combustor without stopping the combustion operation of the bath and without performing gas purging of the bath combustor, and when the combustion of the hot water supply combustor is stopped, gas purging of both combustors is performed. A method for controlling a combustor, which is characterized in that a re-ignition operation is performed after the start.