JP3674320B2 - Combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus that supplies air from a blower to perform combustion operation.
[0002]
[Prior art]
Conventionally, as a combustion apparatus, for example, a combustion apparatus called a liquid fuel vaporization type is known. In this method, kerosene, which is a liquid fuel, is vaporized in a gas state by a vaporizer and mixed with air and burned by a burner.
[0003]
In this type of combustion apparatus, during combustion, a damper is provided in the middle of an air ventilation path communicating with the carburetor, and a blower for blowing air toward the ventilation path is provided. Combustion control is performed by controlling the blowing operation of the blower.
[0004]
[Problems to be solved by the invention]
By the way, for example, when the combustion apparatus is incorporated in a hot water supply apparatus, maintenance inspection for the combustion apparatus may be performed regularly or irregularly.
[0005]
There are various types of maintenance inspection items. For example, when performing maintenance inspections of combustion equipment, if the combustion equipment is used before the maintenance inspection, maintenance of combustion parts such as carburetors and burners is performed. Since the inspection target part is in a high temperature state, it is impossible for the maintenance inspector to touch it by hand. Therefore, it is necessary to wait until the combustion part is cooled to a low temperature state, and the maintenance inspection is performed. It is pointed out that the waiting time until is long.
[0006]
In particular, even if it is already known that parts such as carburetors or burners need to be replaced, for the reasons described above, the maintenance inspector cannot immediately perform parts replacement work. It has become a major cause of requiring labor and time for maintenance and inspection.
[0007]
Therefore, an object of the present invention is to enable quick maintenance and inspection work in a combustion apparatus so that the temperature can be lowered in a short time even when the combustion part is in a high temperature state during maintenance and inspection.
[0008]
[Means for Solving the Problems]
The present invention relates to a combustion apparatus that performs combustion operation by supplying air from a blower, and when a specific operation different from the operation of starting or stopping the combustion operation is performed in a state where the combustion operation is stopped. When the temperature detection means detects the temperature of the combustion part and the detected temperature exceeds a predetermined value, the blower is operated at the maximum rotation speed and the damper for opening the air passage is fully opened. As a state, a forced cooling process for the combustion portion is executed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings. In this embodiment, a liquid fuel vaporization type combustion apparatus is exemplified, but the present invention is not limited to this system. In short, any combustion apparatus that performs combustion operation by supplying air from a blower may be used. Applies to Moreover, in this embodiment, although the thing used for a hot water supply apparatus as a combustion apparatus is mentioned as an example, as an apparatus in which a combustion apparatus is used, it is not limited only to a hot water supply apparatus.
[0010]
1 to 4 relate to one embodiment of the present invention, FIG. 1 is a block diagram showing a hot water supply apparatus, FIG. 2 is a block diagram of the combustion apparatus in FIG. 1, and FIG. 3 is a block diagram of the controller in FIG. FIG. 4 is a block diagram for explaining the operation.
[0011]
In the drawing, A shows the entire combustion apparatus, and this combustion apparatus A includes a heat exchange can 10, a vaporizer 20, a burner 30, a fuel supply means 40, a blower 50, and a damper 60. It is configured. A hot water supply circuit 70, a bath cooking circuit 80, and a controller 90 are attached to the combustion apparatus A, thereby forming a hot water supply apparatus.
[0012]
In the heat exchange can body 10, heat exchange pipes 72 and 82 of the hot water supply circuit 70 and the bath cooking circuit 80 are penetrated, and the vaporizer 20 and the burner 30 are arranged below the heat exchange can body 10. Has been.
[0013]
The vaporizer 20 vaporizes liquid fuel such as kerosene supplied from the fuel supply means 40. The diffusion vane 21, vaporizer heater 22, vaporizer temperature sensor 23, vaporization wall surface 24, mixing chamber 25, and mixing chamber heater 26 are used. , A motor 27, an air supply temperature sensor 28, a motor rotation speed sensor 29, and the like. In the vaporizer 20, the supplied liquid fuel is scattered on the vaporization wall surface 24 by rotating the diffusion blade 21 by the motor 27, and vaporized by the heat in the vaporization heater 22 and the mixing chamber heater 26. It has become. The supply air temperature sensor 28 detects the temperature of the air taken in to send to the vaporizer 20 and the burner 30, and is composed of a thermistor or the like.
[0014]
The burner 30 ignites and burns vaporized fuel supplied from the vaporizer 20 and air supplied from the blower 50, and includes an igniter 31 and a flame detector 32.
[0015]
The combustion supply means 40 supplies kerosene from a kerosene tank (not shown) to the vaporizer 20, and includes a pumping pump 41, a sub tank 42, a constant flow pump 43, and the like.
[0016]
The blower 50 supplies air to the vaporizer 20 and the burner 30, and includes a blower fan 51, a drive motor 52, a rotation speed sensor 53, and the like.
[0017]
The damper 60 is provided in the middle of the ventilation path which connects the vaporizer 20 and the air blower 50, and controls the opening degree of this ventilation path. The damper 60 is displaced in two states by a driving means such as an electric motor (not shown), a position for closing the ventilation path (see the solid line in FIG. 2) and a position for opening the ventilation path (see the broken line in FIG. 2). The damper 60 here is in a state that allows the required ventilation without completely closing the ventilation path at the closed position.
[0018]
In the combustion apparatus A having such components 10 to 60, liquid fuel such as kerosene supplied from the fuel supply means 40 is vaporized by the carburetor 20, and this vaporized fuel and the air supplied from the blower 50 are in a required ratio. Are mixed and sent to the burner 30 for combustion. With this combustion heat, water passing through the heat exchange pipes 72 and 82 of the hot water supply circuit 70 and the bath cooking circuit 80 in the heat exchange can 10 is heated. The air supplied from the blower 50 and passed through the damper 60 is not only sent to the carburetor 20 side as primary air but also directly supplied to the burner 30 as secondary air, and a part of the secondary air is ineffective air. And passes through the heat exchange can 10.
[0019]
The hot water supply circuit 70 has a bypass mixing structure in which, for example, tap water or the like is mixed with hot water heated by the combustion apparatus A and a part of tap water and discharged from a hot water supply curan (see broken line). The hot water supply circuit 70 includes a water inlet pipe 71, a heat exchange pipe 72, a hot water outlet pipe 73, a bypass pipe 74, a hot water supply pipe 75, an incoming water flow rate sensor 76, an incoming water temperature sensor 77, an outgoing hot water temperature sensor 78, and a hot water supply temperature sensor. 79 and the like. The hot water supply pipe 75 is branched into a general hot water supply pipe 75a and a bath dropping hot water supply pipe 75b on the way.
[0020]
The bath cooking circuit 80 takes out the bathtub water of a bathtub (not shown), heats it to the required temperature with the combustion device A, and returns it to the bathtub. The hot water supply circuit 70 can mix hot water at the required temperature. It has become. This bath cooking circuit 80 includes a bath return line 81, a heat exchange line 82, a bath outlet line 83, a bypass line 84, a circulation pump 85, a water flow switch 86, and the like.
[0021]
As shown in FIG. 3, the controller 90 includes a controller main body 90a and a remote controller 90b, and executes at least the combustion operation process and the forced cooling process shown in FIG.
[0022]
The above-described combustion operation process is started when, for example, the hot water supply curan is opened and the water flow rate sensor 76 detects a minimum operating water amount or more, and FF (feed forward) with respect to the required combustion amount. The opening and closing of the damper 60 and the air volume of the blower 50 (the number of revolutions by the blower fan 51) are set so that the actual combustion heat quantity approaches the required combustion heat quantity by adding the combustion heat quantity by FB (feedback) control to the combustion heat quantity by control, The fuel supply amount by the constant flow pump 43 is controlled.
[0023]
In addition, the forced cooling process is started in response to a specific operation, and the blower fan 51 of the blower 50 is rotated at the maximum rotation number and the damper 60 is fully opened, so that the vaporizer 20, the burner 30, etc. Air-cool the combustion part. In this embodiment, the above-described specific operation means that the maintenance / inspection operator removes the supply air temperature sensor 28 from the sensor connector 33 in a state where the combustion operation switch is turned off.
[0024]
Next, the operation related to the forced cooling process, which is a feature of the present invention, will be described in detail with reference to FIG.
[0025]
That is, when the combustion operation switch is turned off, the control flow of FIG. 4 is started in step n1, and the standby state waits until the combustion operation switch is turned on or a condition for executing the forced cooling process is satisfied. become.
[0026]
In this standby state, if it is determined in step n2 that the combustion operation switch is turned on, the combustion operation mode is executed in step n3. If it is determined in step n2 that the combustion operation switch is not turned on, the process proceeds to step n4. To do.
[0027]
In step n4, it is determined whether or not the supply air temperature sensor 28 has been removed from the sensor connector 33 and has been open for a required time. That is, when the supply air temperature sensor 28 is removed from the sensor connector 33, sensor input from the supply air temperature sensor 28 to the controller 90 is stopped, so that it can be recognized that the supply air temperature sensor 28 is in an open state. However, even if it is recognized that it is in the open state, the forced cooling process is not executed until the required time, for example, 3 seconds elapses. Incidentally, the reason for performing such time management is that the open state of the supply air temperature sensor 28 may occur due to the fact that the conductivity temporarily decreases to, for example, about 3 seconds or less due to adhesion of water droplets, for example. In short, I do it just as a reminder.
[0028]
Here, if it is determined in step n4 that it is not in the open state for the required time or longer, the process returns to step n2 and the standby state is continued, but if it is determined that the open state is longer than the required time, the process proceeds to the subsequent step n5.
[0029]
In step n5, it is determined whether it is necessary to perform forced cooling processing on the combustion portion. Here, the ambient temperature around the vaporizer 20 and the burner 30 corresponding to the combustion portion is detected using the vaporizer temperature sensor 23 installed in the vicinity of the combustion portion, and the detected temperature value is equal to or greater than a predetermined value. It is checked whether or not. In addition to the carburetor temperature sensor 23, the temperature may be detected by a temperature sensor installed at an appropriate location of the combustion apparatus A or a temperature sensor provided separately.
[0030]
If it is determined that the temperature of the combustion part is relatively low and it is not necessary to perform forced cooling, the forced cooling process is canceled in step n6, but it is determined that the combustion part is high temperature and should be forcibly cooled. Then, the forced cooling mode is entered at step n7. This forced cooling mode is a mode in which the blower fan 51 of the blower 50 is operated at the maximum rotation speed and the damper 60 is fully opened, thereby forcibly cooling the combustion portion such as the carburetor 20 or the burner 30. To do.
[0031]
This forced cooling mode is performed for a required time, for example, 5 minutes, and waits for the required time to elapse in step n8. This time may be appropriately determined by experiments or the like. This timing operation is performed by a timer in the controller 90.
[0032]
When the required time elapses, the driving of the blower 50 is stopped at step n9 and the damper 90 is closed to end the forced cooling mode. In the forced cooling mode, the blower fan 51 is operated at the maximum rotational speed, so that the temperature state of the combustion portion is changed by decreasing the rotational speed of the blower 50 by a predetermined number without suddenly stopping the operation. It may be determined appropriately by monitoring. Similarly, the damper 60 may be closed to the predetermined opening after 5 minutes, or may be fully opened.
[0033]
However, if it is determined in step n8 that the required time has not elapsed, it is checked in step n10 whether the combustion operation switch is turned on during execution of the forced cooling mode, and in step n11, the supply air temperature sensor 28 detects the sensor. It is checked whether or not the connector 33 is connected (not opened). In other words, even if the forced cooling mode is executed, if the combustion operation switch is turned on in the middle or the supply air temperature sensor 28 is closed, that is, connected to the sensor connector 33, the step is performed even before the required time has elapsed. The process proceeds to n9 and the forced cooling mode is immediately terminated.
[0034]
As described above, when the combustion part such as the burner 30 or the carburetor 20 of the combustion apparatus A is maintained and inspected, when it is in a high temperature state, the existing blower 50 is used for forced cooling. , It can be in a low temperature state that can be maintained and inspected in a short time. This eliminates the long waiting time of waiting for the temperature of the combustion part to decrease due to natural cooling as in the past, so that quick maintenance and inspection work can be performed. For users who own it, there is an advantage that waste can be eliminated.
[0035]
In addition, this invention is not limited only to the said embodiment, A various application and deformation | transformation can be considered.
[0036]
(1) In the above-described embodiment, the forced cooling process is executed when the maintenance / inspection operator removes the supply air temperature sensor 28 from the sensor connector 33. However, a dedicated switch for instructing forced cooling is provided. The forced cooling process may be executed when this switch is operated. Although not shown, the above-described switch can be provided as a maintenance / inspection operation unit on the controller main body 90a or the remote controller 90b, for example. When the maintenance / inspection operation unit is provided in the controller main body 90a, the maintenance / inspection operation unit is hidden inside the housing of the controller 90, so that it can be prevented from being operated by anyone other than the maintenance / inspection operator. Further, the forced cooling process may be executed by inputting a specific code from the remote controller 90b. Also in this case, if only the maintenance and inspection operator can understand the code, it is possible to avoid the forced cooling process by the user.
[0037]
(2) When the forced cooling process is executed by a switch operation or the like as in (1) above, the supply air temperature sensor 28 or the forced cooling process is not performed in the form of time management as in the above embodiment. The processing may be terminated when the temperature detected by the vaporizer temperature sensor 23 or the like falls below a temperature that does not require forced cooling. In this case, the time required for the forced cooling process varies depending on the temperature of the combustion portion at the time when the forced cooling process is executed.
[0038]
(3) In the above embodiment, step n5 of the control flow may be omitted.
[0039]
【The invention's effect】
According to the first aspect of the present invention, the combustion portion can be forcedly cooled as necessary, so that even when the combustion portion is at a high temperature, the temperature can be quickly lowered to perform maintenance and inspection on the combustion portion immediately. become. Thereby, it becomes possible to shorten the useless waiting time as in the conventional example.
In particular, as the forced cooling process, the blower is operated at the maximum rotation speed and the damper is fully opened, so that the temperature of the combustion portion can be lowered in a short time.
In addition, because the combustion part is forcibly cooled using the existing blower provided in the combustion device and the opening control means of the ventilation path, there is no need to separately install the forced cooling means, etc. You can avoid up.
In addition, even if there is an operation to execute forced cooling processing, forced cooling processing is not performed in situations where the combustion part is not hot and cooling is not necessary, so maintenance inspections such as saving waste can be performed. Convenience to do is good.
[0042]
If the input stop operation for stopping the sensor input from the supply air temperature sensor is performed as the specific operation as in the second aspect of the invention, the maintenance inspector simply removes the supply air temperature sensor from the sensor connector, for example. It is convenient because maintenance and inspection can be performed with simple operations.
In this case, since it is confirmed that the input stop operation has continued for a predetermined time, even if the supply air temperature sensor is removed from the sensor connector for some reason, If it is within the time, no unnecessary operation such as forced cooling processing is not performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a hot water supply apparatus equipped with a combustion apparatus of the present invention. FIG. 2 is a block diagram showing the combustion apparatus in FIG. 1. FIG. 3 is a block diagram of a controller in FIG. 4] Control flow diagram for explaining the operation of the hot water supply apparatus of FIG.
A Combustion device 10 Heat exchange can body 20 Vaporizer 28 Supply air temperature sensor 30 Burner 33 Sensor connector 40 Fuel supply means 50 Blower 51 Blower fan 60 Damper 90 Controller 90a Controller main body 90b Remote control

Claims (2)

In a combustion apparatus that performs combustion operation by supplying air from a blower,
When a specific operation different from the start or stop operation of the combustion operation is performed in a state where the combustion operation is stopped , the temperature detection unit detects the temperature of the combustion part and detects the temperature. Combustion characterized in that when the value is equal to or greater than a predetermined value, the blower is operated at the maximum rotation speed, and the damper for controlling the opening degree of the ventilation passage is fully opened to perform forced cooling processing on the combustion portion. apparatus. 2. The combustion apparatus according to claim 1 , wherein the specific operation is an input stop operation for stopping a sensor input from a supply air temperature sensor that detects a temperature of the supply air , and the input stop state continues for a predetermined time. A combustion apparatus that performs the forced cooling process .

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