JP3268982B2 - Evaporative oil burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporized petroleum combustor provided with a vaporizing heater constituting a combustion section of a water heater or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, as disclosed in Japanese Utility Model Publication No. 61-43084, for example, a vaporizer is preheated to a predetermined temperature by a vaporizing heater. The vaporizer forms a premixed gas of the vaporized gas and the combustion air, and supplies the premixed gas to the burner to obtain good combustion.

[0003]

In this conventional apparatus, the vaporizer is always kept at a predetermined temperature, but no consideration is given to a burner portion communicating with the vaporizer. When the combustion air temperature is low and low, the bar
The temperature of the burner portion is also low, and at the time of ignition, the vaporized gas comes into contact with the low-temperature burner portion and liquefies, so that good combustion cannot be obtained until the temperature of the burner portion rises. Was something.

[0004]

The present invention focuses on this point, and solves the above-mentioned drawbacks.
A vaporizer for vaporizing fuel oil, comprising a fuel gas and a vaporization temperature sensor,
A burner section which communicates with the carburetor to premix and burn the vaporized gas and combustion air, and further comprises a heater control circuit for preheating the carburetor to a predetermined temperature prior to combustion. In that, when the vaporizer reaches a certain temperature during the preheating,
A burner heating circuit is provided for operating the combustion fan for a certain period of time. The burner heating circuit varies the operating time of the combustion fan according to the temperature of combustion air detected by an air temperature sensor so that the operation time of the combustion fan increases as the temperature decreases. And this combustion fan
Operation is a stand that keeps the preheated state of the vaporizer
This is performed at regular time intervals during a buy.

[0005]

The vaporizer heater 6 is energized to heat the vaporizer 5, and the vaporizer temperature sensor 7 detects the temperature of the vaporizer 5, and the vaporizer 5 can be vaporized by the control of the heater control circuit 18. It preheats to the temperature.

When the vaporizing temperature sensor 7 detects that the vaporizer 5 during preheating has reached a certain temperature lower than the predetermined temperature, the burner heating circuit 21 starts the operation of the combustion fan 8 at a predetermined number of revolutions, and further operates. After a lapse of 15 seconds from the start, the control is performed such that the lower the combustion air temperature detected by the air temperature sensor 13 is, the longer the operation time of the combustion fan 8 is.

Therefore, when the combustion air temperature is low and low,
The air heated to a high temperature by the preheating in the carburetor 5 is blown to heat the burner section 3, and the blowing time is varied by the air temperature, so that the burner section 3 is reliably heated even when the temperature is low. It is possible to always perform good ignition and combustion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which a vaporized oil combustor according to the present invention is applied to a combustion section of a water heater as shown in the drawings will be described. Reference numeral 1 denotes a heat exchanger provided in the middle of the hot water supply passage 2, which is heated by the combustion of a burner portion 3 located below, and appropriately supplies hot water by opening a hot water tap 4 provided at the end of the hot water supply passage 2. It is.

Reference numeral 5 denotes a vaporizer provided with a vaporization heater 6 and a vaporization temperature sensor 7. The vaporizer is heated to a predetermined temperature, which is a temperature at which fuel oil can be vaporized, and maintained at this temperature, and premixes vaporized gas and combustion air. This is burned in the burner section 3 which communicates with this.

Numeral 8 denotes a combustion fan for supplying primary air for premixing to the carburetor 5 through the air passage 9 and secondary air for combustion to the burner section 3, respectively. The air that has flowed in from the formed combustion air intake 11 is suctioned from the air inlet 12 and supplied to each section. The air inlet 12 has an air temperature sensor 1 that detects the temperature of the combustion air.
3 are provided.

Reference numeral 14 denotes an exhaust port for discharging exhaust gas after heat exchange, and an exhaust path 15 provided with the heat exchanger 1 and the burner section 3.
Is in communication with

Reference numeral 16 denotes a running water sensor provided in the hot water supply passage 2 on the upstream side of the heat exchanger 1, which detects running water at a predetermined flow rate when the hot water tap 4 is opened, and outputs a signal indicating a heat request requiring hot water supply. Is output.

Reference numeral 17 denotes a tapping temperature sensor provided in the middle of the hot water supply passage 2 between the heat exchanger 1 and the hot water tap 4 for detecting the tapping temperature.

Numeral 18 denotes a heater control circuit for controlling the energization of the vaporizing heater 6.
Is detected, and the vaporizer 5 is preheated to a predetermined vaporizable temperature to start combustion. After the combustion, this temperature is maintained. No power is supplied to the data 6.

Reference numeral 19 denotes a standby circuit for holding the vaporizer 5 in a preheated state which is a vaporizable temperature for a predetermined time before the start of combustion. The standby circuit has a timer function and counts one hour upon receiving an ON signal of the hot water supply switch 20. And a drive signal is output to the heater control circuit 18 until the count-up. If there is a heat request even once during this one hour, the detection of the flowing water sensor 16 is performed. Upon receiving the signal, the timer is reset and the heat is extended for another one hour after the heat request, and this is continued sequentially, that is, the standby mode is automatically released only when there is no heat request for one hour. Things.

Numeral 21 is a burner heating circuit for heating the burner section 3 by operating the combustion fan 8 for a fixed time while the carburetor 5 is being preheated. The burner heating circuit 21 has a timer function and the heater control circuit 18 and the heater control circuit 18. −
The operation of the combustion fan 8 is also connected when the temperature of the carburetor 5 reaches a certain temperature lower than a predetermined vaporizable temperature and at certain time intervals during the standby state. To start.

Further, the operation continuation time of the combustion fan 8 by the burner heating circuit 21 is variable in accordance with the combustion air temperature detected by the air temperature sensor 13 after a certain period of time from the start of the operation. If the air temperature is 0 ° C. or less, the operation is performed for 60 seconds, the operation is performed for 40 seconds when the temperature is 0 ° C. to less than 15 ° C., and the operation is performed for 25 seconds when the temperature is 15 ° C. or more. Is selected from among these three types.

Reference numeral 22 denotes a combustion control circuit including a heater control circuit 18 and a burner heating circuit 21. The combustion control circuit 22 includes one microcomputer having functions such as comparison, calculation, storage, and timer.
In addition to controlling other driving parts such as an igniter (not shown), each part can be controlled via a heater control circuit 18 and a burner heating circuit 21.

Reference numeral 23 denotes a preheating indicator which is turned on during preheating of the vaporizer 5 and indicates that the standby circuit 19 is preheating.

Next, the operation of this embodiment will be described with reference to the flowcharts of FIGS. Now turn on the hot water switch 20
When N is reached, the heater control circuit 18 energizes the vaporization heater 6 and starts preheating the vaporizer 5 (step 24).

Then, the program proceeds to a step 25, wherein it is judged by the vaporizing temperature sensor 7 whether the vaporizer 5 has reached a constant temperature, here 210 ° C., which is lower than a predetermined vaporizable temperature. The operation of the combustion fan 8 is started at a low speed of 1000 rpm by 21, and the heated air in the carburetor 5 is blown to the burner section 3 to blow the air.
This is for heating the corner portion 3.

Next, the process proceeds to a step 27, wherein the burner heating circuit 2
It is determined whether 15 seconds have elapsed since the start of operation of the combustion fan 8 via step 1, and the process proceeds to step 28 with YES, and the combustion air temperature is acquired by the air temperature sensor 13. First, when the air temperature is 0 ° C. or less, the process proceeds with YES. 29, the operation time of the combustion fan 8 is set to 60 seconds.
If it is 0, it is determined whether it is 0 ° C. to less than 15 ° C.
In step 32, the operation time of the combustion fan 8 is set to 40 seconds.
The operation time of the combustion fan 8 is set to 25 seconds.

The program further proceeds to step 33, where it is determined whether or not the operation time of the combustion fan 8 has been selected in accordance with each air temperature. If YES, the program proceeds to step 34, where the operation of the combustion fan 8 is stopped. At 35, the heater control circuit 18 controls the vaporization heater 6 to be 235 DEG C. OFF and 225 DEG C. ON to maintain the vaporizer 5 at a predetermined vaporizable temperature and terminate the preheating mode.

That is, thereafter, the operation automatically shifts to the standby mode described below. Since the temperature of the carburetor 5 does not usually fall thereafter, the operation of the combustion fan 8 at the temperature of the carburetor 5 is performed. The heating of the burner section 3 is performed only once by turning on the hot water supply switch 20 and is effective at the time of normal use in which a hot water supply request is made immediately after the hot water supply switch 20 is turned on.

Therefore, immediately after this, in the normal use by opening the hot water tap 4, there is a heat request, and the ignition operation is started via the combustion control circuit 22 and the combustion for hot water supply is started. As described above, the burner unit 3 is sufficiently heated by the blowing operation of the combustion fan 8 according to the combustion air temperature at that time, so that liquefaction and non-ignition do not occur.
Good combustion due to poor ignition can be obtained, and even if there is a heat request before the end of preheating, combustion will not be started until preheating is completed, so combustion in an insufficient state is prevented. is there.

Next, after the completion of the preheating, that is, when the vaporizer 5 is turned on,
When the standby mode enters the one-hour standby mode by the standby circuit 19 while maintaining the vaporizable state by the data control circuit 18 (step 36), it is first determined in step 37 that there is no heat request, and if NO, the heat request is not issued. At some point, the above-described ignition operation is performed.

On the other hand, if YES, the program proceeds to step 38, in which it is determined whether the state without heat request and the state in which the combustion fan is OFF have continued for a predetermined time, here 20 minutes. Then, the flow returns to step 37, and if the heat request is not continued, the flow of steps 26 to 34 is sequentially repeated again after 20 minutes.

Accordingly, in the standby state, the combustion fan 8 is operated at regular time intervals to heat the burner section 3 in accordance with the air temperature, so that the burner section 3 is always maintained at an optimum temperature. Therefore, good combustion is performed regardless of the heat demand.

Further, by setting the driving speed of the combustion fan 8 for heating the burner section 3 to a low speed at 1000 rpm, the driving sound is small and sounds before starting the combustion to give the user an uneasy feeling. Since the temperature can be prevented and the speed is low, the heating of the burner section 3 can be performed well.

Further, since the air temperature is detected after driving the combustion fan 8 for 15 seconds, only the accurate combustion air temperature can be detected without detecting the air temperature stagnating in the body frame 10, and the burner unit 3 is heated. The most suitable operation time of the combustion fan 8 can be selected.

[0031]

In summary, the present invention provides a vaporizer provided with a vaporization heater and a vaporization temperature sensor for vaporizing fuel oil, and a burner which communicates with the vaporizer and premixes and vaporizes a vaporized gas and combustion air. And a heater control circuit for preheating the carburetor to a predetermined temperature prior to combustion.
A burner heating circuit for operating the combustion fan for a predetermined time when the vaporizer reaches a predetermined temperature during the preheating; and the burner heating circuit is configured to control the combustion fan according to a combustion air temperature detected by an air temperature sensor. The operating time of the combustion fan is varied so as to be longer as the temperature is lower.
Is in standby to keep the preheated state of the vaporizer for a certain period of time
Since the burner section can be heated before ignition by using the preheating of the vaporizer, liquefaction and non-ignition of vaporized gas can be reliably prevented and always good. The operation time of the combustion fan for heating the burner portion is varied depending on the combustion air temperature at that time, and the lower the temperature, the longer the operation time. To perform good combustion without being affected by the use environment.

Further, during the standby mode in which the preheating of the vaporizer is continued for a predetermined time, the burner for operating the combustion fan is heated at a predetermined time interval . Therefore , the burner is used together with the vaporizer. The combustion is always maintained in a combustible state, so that good combustion can be immediately performed regardless of the heat demand.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater provided with a vaporized oil combustor according to one embodiment of the present invention.

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

FIG. 3 is a flowchart of the preheating mode.

FIG. 4 is a flowchart of the standby mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 Burner part 5 Vaporizer 6 Vaporization heater 7 Vaporization temperature sensor 8 Combustion fan 13 Air temperature sensor 18 Heater control circuit 21 Burner heating circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-316917 (JP, A) JP-A-4-108151 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/20

Claims (1)

(57) [Claims] A vaporizer having a vaporization heater and a vaporization temperature sensor for vaporizing fuel oil; and a burner section which communicates with the vaporizer and premixes and vaporizes vaporized gas and combustion air. Further, in a heater equipped with a heater control circuit for preheating the carburetor to a predetermined temperature prior to combustion, a burner heater for operating the combustion fan for a predetermined time when the carburetor reaches a certain temperature during the preheating. And a burner heating circuit that varies the operating time of the combustion fan according to the temperature of the combustion air detected by the air temperature sensor so that the operation time of the combustion fan increases as the temperature decreases.
In addition, the operation of this combustion fan reduces the preheating state of the carburetor.
Hold for a certain period of time
Evaporative oil burner, characterized in that had Unishi.