JPH1047660A - Burner controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burning damage due to backflow of hot air during standby for holding a vaporizer at a vaporizable temperature. SOLUTION: In the burner controller which comprises a standby circuit 7 to hold a vaporizer 4 at a vaporizable temperature for a predetermined time, the controller further comprises a safety means 10 for sensing a predetermined temperature or higher continuously for a predetermined time during standby to thereby drive a combustion fan 11 for a predetermined time. Accordingly, a burning damage of an electric component part or the like due to backflow of hot air can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner control device provided with a standby circuit for maintaining a vaporizer for vaporizing fuel oil at a vaporizable temperature.

[0002]

2. Description of the Related Art Conventionally, in this type, a vaporizer is always kept at a vaporizable temperature as disclosed in Japanese Patent Publication No. 7-103993, for example.
Even with a vaporized oil burner, good hot water can be supplied immediately by opening the hot water tap.

[0003]

By the way, in this conventional apparatus, when there is a wind pressure fluctuation such as a back wind during standby while the carburetor is being kept warm, the air in the high temperature state flows backward while keeping the carburetor warmed up, and the appliance flows through the suction port of the combustion fan. And has the disadvantage of burning out the electrical components in the appliance, in particular.

[0004]

The present invention focuses on this point, and solves the above-mentioned drawbacks.
And a vaporizer for vaporizing fuel oil, and for premixing the supply of combustion air from a combustion fan, and a standby circuit for holding the vaporizer in a standby state at a vaporizable temperature for a certain period of time. In that
At the time of standby of the carburetor, an air temperature sensor provided in a combustion air blowing path is provided with safety means for driving the combustion fan for a predetermined time when the air temperature sensor continuously detects a predetermined temperature or more for a predetermined time. .

[0005]

When the vaporizer 4 is in a standby state at a vaporizable temperature and the air in the vaporizer 4 which has become high temperature due to the invasion of the reverse wind flows backward through the blowing path 12, the air temperature sensor 14 detects the temperature of 60 ° C. or more for 5 seconds. By continuously detecting, a signal is sent to the safety means 10 and the safety means 10
Since it is driven at 1000 rpm for one minute to prevent the backflow of hot air and forcibly discharge it through the normal exhaust path 19, it is possible to prevent the risk that the components in the appliance main body 18 and especially the electric components are burned out, and to ensure the failure of the appliance. Can be prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A burner control device according to the present invention will be described below with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a combustion burner located below a heat exchanger 2 through which feed water flows, which is provided with a vaporization heater 3 and is heated at a temperature at which fuel oil can be vaporized to form a premixed gas composed of vaporized gas and primary air. The evaporator 4 communicates with the evaporator 4 to perform evaporative combustion.

Reference numeral 5 denotes a heater control circuit for controlling the energization of the vaporization heater 3, which detects the temperature of the vaporizer 4 via a vaporization temperature sensor 6 and brings the vaporizer 4 to a predetermined vaporizable temperature. To keep.

Reference numeral 7 denotes a standby circuit for setting the vaporizer 4 to a standby state for maintaining the vaporizer 4 at a vaporizable temperature for a certain period of time. The standby circuit has a timer function and starts counting one hour upon receiving an ON signal of the hot water supply switch 8. A drive signal is output to the heater control circuit 5 until the count-up. If there is a heat request even once during this one hour, the heat signal is received by the detection signal of the flowing water sensor 9. One hour is extended after the request, and this is continued sequentially, that is, the standby state is stopped only when there is no heat request for one hour.

Reference numeral 10 denotes safety means capable of independently controlling the driving of a combustion fan 11 for supplying combustion air. An air temperature sensor 14 provided at an air inlet 13 which is an air supply path 12 to the carburetor 4 operates during the standby state. By continuously detecting the abnormal temperature of 60 ° C. or more for 5 seconds, the combustion fan 11 is driven for 2 minutes to ensure safety.

Reference numeral 15 denotes a heater control circuit 5 and a safety means 10.
A combustion control circuit including the above controls an electromagnetic pump (not shown) for supplying fuel oil and driving parts such as a combustion fan 11 and an igniter (not shown) to provide a hot water supply pipe 16 communicating with the heat exchanger 2. The combustion of the burner 1 is controlled by a signal from each of the sensors such as the flowing water sensor 9 and the hot water temperature sensor 17 or a set value from a hot water temperature setting device (not shown) to supply hot water at a set temperature. Is what you get.

Reference numeral 18 denotes an appliance main body constituting the water heater, which communicates with an exhaust path 19 provided with a burner 1 below at the upper part of the outer periphery for discharging exhaust gas after heat exchange with the heat exchanger 2. An exhaust port 20 is provided. Further, an intake 21 for combustion air is provided below one side wall, and a printed circuit board constituting the combustion control circuit 15 is provided between the intake 21 and the air inlet 13. It receives a cooling effect due to the inflow of cold air.

Reference numeral 22 denotes a hot water tap provided at the end of the hot water supply pipe 16. When the hot water supply pipe 16 is opened, a flow of water is generated in the hot water supply pipe 16. Each part is controlled by the judgment.

Reference numeral 23 denotes a preheating indicator, which comprises a lamp and indicates that preheating is in progress. The preheating indicator 23 is lit by a signal from the heater control circuit 5 to indicate that preheating is currently in progress and combustion cannot be started, and is turned off after completion of preheating. This indicates that the preheating has been completed and combustion can be started at any time.

Further, the standby circuit 7 and the combustion control circuit 15 are each constituted by a microcomputer having various functions such as comparison, calculation and timer, or are constituted by one microcomputer.

Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG. If the hot water supply switch 8 is turned on in step 24, the standby circuit 7 is operated to control the energization of the vaporization heater 3 via the heater control circuit 5, that is, first, in step 25, the preheating indicator 23 Is turned on to indicate that preheating is in progress, and then the routine proceeds to step 26, where the vaporization heater 3 is energized to start preheating of the vaporizer 4, and the vaporizer 4 detects the temperature at which the vaporizer 4 can vaporize fuel by the vaporization temperature sensor 6. Is detected, the preheating is terminated in step 27, and the preheating indicator 23 is turned off in step 28 to inform that preheating is completed and combustion is possible at any time.

In step 29, the standby circuit 7 enters a standby mode in which the vaporizer 4 is maintained at a vaporizable temperature for one hour in accordance with the temperature detected by the vaporization temperature sensor 6, and then in step 30. It is determined whether or not there is a heat request, that is, a hot water supply request for opening the hot water tap 22 is waited.
In this control, the burner 1 is burned to supply good hot water. Conversely, if there is no heat request, the process proceeds to step 32.

Next, at step 32, the air temperature sensor 14 detects the temperature in the air passage 12 communicating with the carburetor 4 and inputs it to the safety means 10. The safety means 10 checks whether this temperature is higher than the abnormal temperature of 60 ° C. No, it is determined whether the driving has continued for 5 seconds. If the determination is YES, the process proceeds to step 33, in which the combustion fan 11 is driven at 1000 rpm by the output from the safety means 10, and it is determined in step 34 whether the driving has continued for 2 minutes. If the answer is YES, the process proceeds to step 35, and the drive of the combustion fan 11 is stopped by the output of the stop signal from the safety means 10. On the other hand, if the answer is NO in step 34, the process proceeds to step 36.
Then, it is judged again whether or not heat is required, and if YES, combustion is started in step 37. Conversely, if NO, the process returns to step 34 and waits for continuous driving of the combustion fan 11 for 2 minutes to detect the heat request. is there.

Therefore, even if hot air that keeps the vaporizer 4 warm due to wind pressure fluctuations such as a back wind during standby flows back to the blow path 12, the back flow is prevented by the driving of the combustion fan 11, and normal flow to the exhaust side is performed. To the combustion flow, the combustion control circuit 15
In this way, it is possible to reliably prevent the electric parts and the like containing the above from being burned out.

The rotation speed of the combustion fan 11 is set to 1000 rpm, which is lower than the rotation speed at the time of the minimum combustion of 1800 rpm.
In this case, the driving sound is reduced so that the driving sound of the combustion fan 11 does not give a sense of incongruity even though the user is not supplying hot water. Is set to a condition of continuation at 60 ° C. or more for 5 seconds, erroneous detection can be reliably prevented, and this can be detected quickly in the event of an abnormality.

On the other hand, if NO in step 32, that is, if there is no abnormal heating due to the backflow of hot air, and if the combustion fan 11 is stopped in step 35, the process proceeds to step 38 to determine whether or not one hour of the standby mode has elapsed. If the answer is YES, the process proceeds to step 39 to automatically stop the operation in the standby mode, and if the answer is NO, the process returns to step 31 and repeats this operation sequentially if one hour has not yet elapsed.

Therefore, when the backflow occurs again within one hour, the combustion fan 11 is driven again, and when the backflow does not return to normal within two minutes, the combustion fan 11 is repeated.
Is driven, and can strongly prevent backflow by combustion if heat is required on the way.

[0022]

In short, the present invention provides a vaporizer having a vaporization heater and a vaporization temperature sensor for vaporizing fuel oil and premixing by receiving a supply of combustion air from a combustion fan, and vaporizing the vaporizer for a predetermined time. An air temperature sensor provided in a combustion air blowing path when the carburetor is on standby, continuously detects a predetermined temperature or higher for a certain period of time when the carburetor is on standby. Then, since it is provided with a safety means for driving the combustion fan for a certain period of time, it is possible to reliably prevent burnout of the electric components even if the hot air for keeping the carburetor flows backward in the air supply path during standby. It is extremely safe and can be used with confidence.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an oil water heater provided with a burner control device according to one embodiment of the present invention.

FIG. 2 is a block diagram of a main part of the electric circuit.

FIG. 3 is a flowchart of the main part.

[Explanation of symbols]

 Reference Signs List 3 vaporization heater 4 vaporizer 6 vaporization temperature sensor 7 standby circuit 10 safety means 11 combustion fan 12 ventilation path 14 air temperature sensor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiichi Sato 7-7 Higashi Shinbo, Sanjo City, Niigata Pref.

Claims (1)

[Claims] 1. A vaporizer having a vaporization heater and a vaporization temperature sensor for vaporizing fuel oil and premixing by receiving a supply of combustion air from a combustion fan, and a standby state in which the vaporizer can be vaporized for a predetermined time. And a standby circuit for holding the carburetor,
A burner control device provided with safety means for driving the combustion fan for a predetermined time when an air temperature sensor provided in a combustion air blowing path continuously detects a predetermined temperature or more for a predetermined time. .