JPH0942657A - Apparatus for burning petroleum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a petroleum burning apparatus for which a trial operation can smoothly be made and wherein air within a fuel supply passage can quickly be discharged. SOLUTION: At least, a spray nozzle 12a, a fuel supply passage 12g, a fuel supply pump 12c, a fuel supply control valve 12d, an igniter 12b, a flame detector 13, a blower fan 11 and a control section 70 for controlling respective members of an apparatus for burning petroleum are provided. In a usual igniting operation, the control section 70 executes a safety operation triggered by an ignition miss when the flame detector 13 does not detect flame after recycled igniting operations have been tried specified times. In the case in which a trial operation command is issued, the control section 70 executes, in addition to the usual igniting operation, a special igniting operation which repeats igniting operations without executing the safety operation even if the flame is not detected for a specified period of time preceding the usual igniting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum combustion device that can be used in a water heater or the like.

[0002]

2. Description of the Related Art Conventionally, in a petroleum combustion device, as a safety measure at the time of ignition, if the flame detector does not detect the ignition flame even after performing the recycling ignition operation in which the ignition operation is repeated a plurality of times, the ignition is performed. I was trying to perform a safe operation based on a defect. In the recycle ignition operation, for example, fuel is sprayed for several seconds under discharge by an igniter, and if the flame detector does not detect a flame during that time, spraying is stopped for several seconds, and then fuel spray is again performed for several seconds. This is an operation in which the operation of performing is repeated multiple times, for example, three times. The safe operation can be, for example, an operation of stopping the operation and displaying the ignition failure.

[0003]

However, in the above-mentioned conventional apparatus, the air in the fuel supply passage for oil is still exhausted during the line inspection at the time of assembling the oil combustion apparatus and the trial operation at the time of installation. Since it is started from the state where it is not in operation, even if the ignition operation is performed by the start of the trial operation, it is not easy to actually burn until the air is sufficiently discharged. There was a problem that was done. The test driver had to reset the remote controller and restart the vehicle every time a safe operation was performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the conventional apparatus, provide a petroleum combustion apparatus capable of smoothly performing a trial operation, and promptly discharging the air in the fuel supply passage. To do.

[0005]

In order to achieve the above object, the petroleum combustion apparatus of the present invention is provided with a spray nozzle, a fuel supply passage for supplying fuel to the spray nozzle, and an intermediate portion of the fuel supply passage. Fuel supply pump and fuel supply control valve, igniter for igniting the fuel ejected from the spray nozzle, flame detector for detecting whether combustion is performed, blower fan for supplying air for combustion, and device Of at least a control unit for controlling each member, and as a control mechanism of the control unit, in a normal ignition operation, when the flame detector does not detect a flame even after performing a certain number of recycle ignition operations. A petroleum combustor having a mechanism for performing a safe operation based on poor ignition, as a control mechanism of the control unit, in addition to the normal ignition operation when a trial operation is instructed. The predetermined time prior to ignition operation of the normal is characterized in that a mechanism for causing a special ignition operation to repeatedly continue the ignition operation without performing the safe operation a flame undetected.

According to the features of the present invention described above, when performing a trial run, a command for the trial run is issued by a remote controller or the like, so that a special ignition operation for a certain period of time is ensured prior to the normal ignition operation. , In the meantime, even if the ignition is not done, safe operation is not done,
The ignition operation is repeated. Therefore, the test driver does not have to bother with repeatedly performing the resetting operation or the like accompanying the safe operation, and the test driver can smoothly perform the test driving. In addition, the air in the fuel supply passage can be swept smoothly.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 is an overall configuration diagram of a one-can two-circuit hot water supply apparatus showing an embodiment of an oil combustion apparatus of the present invention, and FIG. 2 is a flowchart showing an operation control mechanism by a control unit.

The overall structure of the one-can, two-circuit water heater will be described with reference to FIG. Reference numeral 10 denotes a one-can, two-circuit type heat exchange can body having one blower fan 11 and one burner 12. A flame detector that detects whether or not combustion is occurring.
Equipped with 13. The burner 12 includes a fuel spray nozzle 12a, an igniter 12b for igniting the petroleum fuel ejected from the spray nozzle 12a, and the like. Fuel is supplied to the spray nozzle 12a by a fuel supply pump 12c and a fuel supply control valve 12d.
Is supplied through the fuel supply passage 12e. Note that
Reference numeral 12f is a return passage for returning excess fuel from the spray nozzle 12a. A heat exchange section 20a of the bath reheating circulation circuit 20 and a heat exchange section 40a of the hot water supply circuit 40 are arranged in the upper space of the heat exchange can body 10. The bath reheating circulation circuit 20 includes a bath return pipe 21 for transporting bath water from a bath (not shown) to the heat exchange can body 10, and heat exchange heated hot water heat exchange can body 10.
It is composed of a bath outflow pipe 22 for transporting from the bath to the bathtub. In the bath return pipe 21, a pressure sensor 31, which detects the bath water level,
A circulation pump 32, a water flow switch 33, and a bath temperature sensor 34 are provided, and a bypass 24 is provided from the bath return pipe 21 to the bath outflow pipe 22 via a three-way valve 23. The hot water supply circuit 40 is an inlet pipe that conveys water from the water supply to the heat exchange can body 10.
41 and a hot water pipe for hot water heated by the heat exchange can body 10
The hot water outlet pipe 42 is further divided into a general hot water supply pipe 43 and a bath automatic drop pipe 44 and extended. The water inlet pipe 41
A water amount sensor 51 and a water inlet temperature sensor 52 are provided in the hot water outlet pipe 42, and a hot water outlet temperature sensor 53 is provided in the hot water outlet pipe 42. Further, a bypass 46 is provided from the water inlet pipe 41 via a proportional control valve 45. A water amount control valve 54 and a hot water temperature sensor 55 are provided downstream of the confluence of the bypass 46. At the end of the general hot water supply pipe 43, a general hot water supply curran 43a is provided, and the automatic bath drop pipe 44 is connected to the bath return pipe 21 through a drop valve unit 44a having a drop water amount sensor to supply hot water to the bathtub. The automatic drop-in is possible.

Reference numeral 70 denotes a control unit, which receives information from sensors provided in each unit of the apparatus, and receives a command from a remote controller (not shown) to perform calculation and determination based on built-in software to issue a predetermined command. Output to each part.

The ignition operation mechanism by the control unit 70 will be described with reference to FIG. Now, in the state where the operation switch provided on the remote controller or the like (not shown) is turned on, if the test operation switch also provided on the remote controller or the like is turned on (Yes in step S1), a special ignition operation for test operation is performed. If the test drive switch is not turned on (NO in step S1), the normal ignition operation is performed.

First, the normal ignition operation shown in steps S11 to S15 will be described. If the water flow switch 33 or the water amount sensor 51 detects the minimum operating water amount or more (YES in step S11) while the operation switch is on and the trial operation switch is off (no in step S1), the controller 70 Starts the normal ignition operation sequence (step S12). That is, the control unit 70 is a blower fan.
After driving 11 and performing pre-purge, set the rotation speed to the rotation speed for ignition, drive the fuel supply pump 12c while discharging by the igniter 12b, and control the fuel supply control valve 12d to start ignition. A suitable oil supply amount is ejected from the spray nozzle 12a through the fuel supply passage 12e. And spray nozzle
Regarding the timing of ejection from 12a, first, the presence or absence of an ignition flame is detected by the flame detector 13 while ejecting fuel for 5 seconds (step S13). If no flame is detected during that time (NO in step S13), the process returns to step S12 through step S14, and a ventilation period is provided by stopping the fuel injection for 3 seconds. During this time, ventilation by the blower fan 11 is performed. After that, the fuel is jetted for 2 seconds as the second time. If the flame detector 13 does not detect a flame during the second spraying (NO in step S13), the process returns to step S12 via step S14, and a ventilation period is further provided for 2 seconds by stopping ejection. Then, as the third time, the fuel is jetted for 2 seconds, and the flame detector 13 detects the presence or absence of the flame during that time (step S13). In the ignition operation sequence,
If the flame is not detected even after performing the recycling three times (No in step S13, Yes in step S14), the control unit 70 performs the safe operation as the ignition failure and displays the ignition failure (step S13). S15). In the safe operation, for example, the fuel supply pump 12c is stopped and the fuel supply control valve 12e is
To stop the discharge from the igniter 12b, and
By stopping 11 after a certain period of post-purge operation,
The operation can be ended. In the above-described normal ignition sequence, the fuel spray time was set to 5 seconds, 2 seconds, and 2 seconds, and the standby period was set to 3 seconds and 3 seconds, but it is not limited to these values. Other values of the same degree can be adopted. Similarly, the number of times of recycling is not limited to three, but may be another number of the same degree.

Next, the special ignition operation for the trial run by the control unit 70 will be described. Now, with the driving switch on,
When the test driving command is issued by turning on the test driving switch (Yes in step S1), the control unit 70
First, the self-embedded 1-minute timer is started, and the remote controller or the like displays a message to the effect that the test drive is in progress (step S2). And the water flow switch 33 or water sensor
When 51 detects the minimum amount of working water or more (Yes in step S3), the control unit 70 starts a special ignition operation sequence for trial operation (step S4). That is, the control unit 70
After driving the blower fan 11 and performing pre-purge, the rotation speed is set to the rotation speed for ignition, and the fuel supply pump 12c is driven and the fuel supply control valve 12d is controlled while discharging by the igniter 12b. Then, the oil supply amount suitable for ignition is ejected from the spray nozzle 12a through the fuel supply passage 12e. The timing of jetting from the spray nozzle 12a is such that the presence or absence of flame is detected by the flame detector 13 while repeating the fuel jet for 5 seconds and the fuel jet stop (ventilation) for 3 seconds (step S5), and during that time. No flame is detected (step S5)
Even if the answer is NO, the fuel injection and the ejection stop (ventilation) are repeated until the 1-minute timer times out (NO in step S9) (step S4). If the flame detector 13 detects a flame before 1 minute has elapsed by the 1-minute timer (Yes in step S5), the igniter for another minute.
After continuing the discharge by 12b, the discharge is stopped (Yes in step S6, S7). After that, normal combustion is reached (step S8). During the test operation, if ignition by the ignition operation is not performed by the time of 1 minute by the 1-minute timer (YES in step S9), the normal ignition operation described above is performed (step S12). Therefore, 5 seconds fuel ejection, 3 seconds ejection stop (ventilation), 2 seconds fuel ejection, 3 seconds ejection stop (ventilation), 2 seconds fuel ejection (recycle 3
If the flame detector 13 does not detect the flame (No in step S13, YES in step S14), the safe operation is performed and the ignition failure display is performed.

In the above description, the timer time by the 1-minute timer is set to 1 minute, but this is because the air is still discharged in the fuel supply passage 12e because the air is still present in the fuel supply passage 12e in the test operation. This is based on the purpose of adding a special ignition operation to the normal ignition operation to prevent the safe operation from being easily performed until the supply passage 12e is filled with the petroleum fuel. Therefore, the 1 minute does not necessarily have to be 1 minute, and an appropriate fixed time sufficient for the air in the fuel supply passage 12e to be discharged is determined according to the scale of the device and the condition of the fuel supply passage 12e. Can be selected as desired. Further, in the special ignition operation sequence for the trial operation (step S4), ejection for 5 seconds and ejection stop for 3 seconds are repeated, but the ejection time does not necessarily have to be 5 seconds, and is shortened around 5 seconds. It may be a number of seconds. Similarly, the jet stop time (ventilation time) does not necessarily have to be 3 seconds, and a short or long number of seconds centered on 3 seconds can be adopted depending on the scale of the apparatus.

[0014]

According to the present invention, there is provided the above construction.
According to the petroleum combustion apparatus described in (1), as a control mechanism of the control unit, in normal ignition operation, if the flame detector does not detect a flame even after performing a certain number of recycle ignition operations, ignition failure occurs. An oil burning device as a mechanism for performing a safety operation based on the above, when a test operation is instructed as a control mechanism of the control unit, in addition to the ignition operation at the normal time, the ignition operation at the normal time is performed. For a certain period of time prior to, a mechanism for performing a special ignition operation that repeats the ignition operation without performing a safe operation even if no flame is detected has been adopted. By issuing a command, it is possible to secure a special ignition operation for a certain period of time prior to the normal ignition operation, and during that time, no safe operation is performed even if ignition is not performed. Without, it can be repeated ignition operation. Therefore, the test driver does not have to bother with repeatedly performing the resetting operation or the like associated with the safe operation, the test operation can be smoothly performed, and the air in the fuel supply passage can be swept smoothly.
Further, as for the ignition operation control program by the control unit, it is only necessary to add one copy of the special ignition operation control program in the case of trial operation to the conventional normal ignition operation control program, so that the control mechanism of the control unit should be changed. You can do less.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a one-can two-circuit water heater showing an embodiment of an oil burning device of the present invention.

FIG. 2 is a flowchart showing an operation control mechanism by a control unit.

[Explanation of symbols]

 10 Heat exchange canister 11 Blower fan 12 Burner 12a Spray nozzle 12b Ignition device 12c Fuel supply pump 12d Fuel supply control valve 12e Fuel supply passage 13 Flame detector 70 Control part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimiaki Asano 93 Edo-machi, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Inventor Toshio Konishi 93 Edo-machi, Chuo-ku, Kobe, Hyogo Noritsu Co., Ltd. Within

Claims (1)

[Claims] 1. A spray nozzle, a fuel supply passage for supplying fuel to the spray nozzle, a fuel supply pump and a fuel supply control valve provided in the middle of the fuel supply passage, and a fuel ejected from the spray nozzle is ignited. For igniting, a flame detector for detecting whether or not combustion is performed, a blower fan for supplying combustion air, and a control unit for controlling each member of the device, and as a control mechanism of the control unit. ,
In the normal ignition operation, an oil combustion apparatus having a mechanism for performing a safe operation based on poor ignition when the flame detector does not detect a flame even after performing a certain number of recycling ignition operations, As a control mechanism of the control unit, when a test operation is commanded, in addition to the normal ignition operation, a safe operation is performed for a certain period of time prior to the normal ignition operation even if no flame is detected. An oil burning device characterized by having a mechanism for performing a special ignition operation in which the ignition operation is repeatedly continued without being carried out.