JP3411172B2 - Pot type combustor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pot type combustor having a pot heater for preheating and ignition at the bottom of a pot burner. 2. Description of the Related Art Conventionally, this type of pot burner requires preliminary combustion in which the bottom portion of the pot burner is heated before starting main combustion. [0003] In the prior art, the pre-combustion involves directly igniting the fuel oil supplied to the bottom of the pot burner and burning it with small heat while maintaining the flame. It takes more than 20 minutes for the bottom to become hot and to shift to the main combustion where it is burned at the top of the pot,
It could not be used on a busy morning or sudden visitor, and a pot burner that can quickly shift to main combustion was desired. In order to solve the above-mentioned drawbacks, the present invention focuses on this point. In particular, the present invention is directed to a pot burner having a plurality of primary air holes and secondary air holes in a peripheral wall. A pot heater mounted on the bottom of the pot burner to perform preheating and ignition, and a temperature sensor for detecting a pot burner temperature.
And a support, the fuel preheating by combustion at the start of the pot heater
Continue until firing, and use this preheating
Temperature sensor has detected that the temperature
To perform the first preliminary combustion with a small amount of fuel and a large amount of combustion air.
And the temperature sensor is at or above a predetermined temperature higher than the predetermined temperature.
Is detected, or the first preliminary combustion is
The second preliminary combustion at the normal air-fuel ratio for a predetermined time.
After that, the operation shifts to the main combustion . In the combustion start operation, first, when the pot heater 7 is energized to heat the bottom of the pot burner 1 to a predetermined temperature, this temperature is detected by the temperature sensor 17 and the first preliminary combustion is performed. That is, the microcomputer 20 controls the electromagnetic pump 11 and the combustion fan 18 in response to the signal from the temperature sensor 17, and the combustion is performed with the combustion oil having a small amount of fuel and a large amount of combustion air. The lower part of the pot burner 1 is strongly heated. The microcomputer 20 counts whether or not the first preliminary combustion has passed for a predetermined time, here 2 minutes and 30 seconds,
Next, a second pre-combustion corresponding to a medium thermal power at a normal air-fuel ratio is performed,
After the second preliminary combustion has been performed for 30 seconds, the output from the microcomputer 20 shifts to the main combustion of the normal combustion. [0007] Therefore, the preheating by the pot heater 7 and the intensive preliminary combustion in two stages can reduce the preliminary combustion time to several minutes, which is extremely convenient for use. When the reburn operation is performed in a short time after the extinguishing, the temperature of the pot burner 1 is still high. Therefore, the temperature is detected by the temperature sensor 17. The process immediately shifts to the second pre-combustion without waiting, and when the temperature of the pot burner 1 is high, the first pre-combustion is canceled to eliminate unnecessary pre-combustion and to automatically shorten the pre-combustion time. It is very easy to use. Next, a pot type combustor according to the present invention will be described with reference to an embodiment shown in the drawings. Reference numeral 1 denotes a cylindrical pot burner with a bottom, which has a primary air hole 2 at a lower portion of a peripheral wall and a secondary air hole 3 at an upper portion, and is covered with an outer cylinder 5 via an air chamber 4. Reference numeral 6 denotes a flame regulating cylinder placed at the center of the pot burner 1, which promotes mixing of the vaporized gas and the combustion air. 7
A pot heater for preheating and ignition provided at the bottom of the pot burner 1 is constituted by a rod-shaped ceramic heater, and a vaporizer for vaporization 8 is mounted on a lower portion thereof. Reference numeral 9 denotes an oil leveler for storing fuel oil on a fixed oil level. The oil leveler draws fuel oil by an electromagnetic pump 11 provided on an upper lid 10 and supplies the fuel oil to the pot burner 1 via a supply pipe 12. Further, the tip of the supply pipe 12 is provided with a small-diameter injection pipe 13 inclined downward toward the inside of the pot burner 1.
And is provided in a protection cylinder 14 fixed to the outer cylinder 5 and penetrating the side wall of the pot burner 1, and a tip portion of the protection cylinder 14 is provided.
And injects the supplied fuel oil to one end of the vaporizing layer 8. Reference numeral 15 denotes an upper cover 10 provided in parallel with the electromagnetic pump 11.
Is connected to the supply pipe 12 on the downstream side of the electromagnetic pump 11 and is connected to the supply pipe 1 when the fire is extinguished.
The fuel oil in 2 is returned to the oil leveler 9. Reference numeral 16 denotes a frame rod suspended in the pot burner 1, which is inserted into a flame and detects ignition, misfire, abnormal combustion, and the like. Reference numeral 17 denotes a temperature sensor comprising a thermistor mounted on the back side of the bottom of the pot burner 1 for detecting the temperature of the bottom of the pot burner 1 and instructing a pre-combustion operation and an ignition operation. This is to prevent overheating. Reference numeral 18 denotes a combustion fan for supplying combustion air from the primary and secondary air holes 2 and 3 into the pot burner 1 through the air chamber 4, and is continuously driven to extinguish the pot burner 1 during fire extinguishing. . Next, the electric circuit diagram of the main part of this embodiment shown in FIG. 2 will be described.
Microcomputer equipped with U, memory, input / output circuit, timer, etc.
21 is a frame voltage FV detected by the frame rod 16
And a reference voltage, and outputs a respective instruction signal to the microcomputer 20. Reference numeral 22 denotes a display unit connected to the output side of the microcomputer 20, which is composed of four 7-segment displays.
In addition to receiving the output from the controller, the time, the room temperature, and the set temperature are switched and displayed, and various errors are displayed. Reference numeral 23 denotes a drive unit for controlling the drive components. The drive unit 23 outputs the pot heater 7 and the combustion fan 1 based on the output from the microcomputer 20.
8 is controlled. Reference numeral 24 denotes a commercial AC power supply 25
A constant-voltage power supply unit that exchanges and outputs a DC of 24 V. The first and second transistors are connected to an electromagnetic pump 11 and a suction pump 15 to receive an excitation current, and to be turned on and off by an output from a microcomputer 20. 26 and 27. A temperature sensor 1 is provided on the input side of the microcomputer 20.
7 is connected to detect the temperature at the bottom of the pot burner 1 and input it to the microcomputer 20. Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. If the operation switch 19 is turned on to start combustion now (step 28), the process proceeds to step 29 with YES, and the pot heater 7 is output from the microcomputer 20.
Is turned on to start heating the bottom of the pot burner 1, and in step 30, it is determined in the microcomputer 20 whether two minutes have elapsed since the pot heater 7 was turned on. Whether the temperature of 80 ° C. or higher is detected or not is determined based on the input to the microcomputer 20, and the process proceeds to the next step. The steps 29 to 31 are set to the preheating mode of the pot burner 1 by the pot heater 7. Next, at step 31, YES and step 32
Then, the combustion fan 18 is rotated at a high speed by the output from the microcomputer 20 at 2500 rpm for 5 seconds to spread the heat at the bottom of the pot burner 1 to the entire pot burner 1, and a hot start mode is set. After the end of the hot start mode, the process proceeds to step 33, where the microcomputer 20 first drives the electromagnetic pump 11 to supply a small amount of fuel oil to the pot burner 1 and to rotate the combustion fan 18 at a rotation speed of 2120 rpm.
By driving as described above, the flame caused by the vaporized gas having a small oil amount generated at the bottom of the pot burner 1 is pressed down by a large amount of combustion air into the bottom of the pot burner 1, and the bottom of the pot burner 1 is further heated to increase the temperature satisfactorily. And step 34
Then, the microcomputer 20 determines whether or not the temperature of the pot burner 1 has reached 300 ° C. based on the input of the temperature sensor 17. Since the temperature does not rise so far except for the re-burning, the process proceeds to step 35 with NO, and The microcomputer 20 determines whether the time of 2 minutes 30 seconds has passed, and the YE
In S, the process proceeds to the next step, and in NO, the process returns to Step 34.
This is a first pre-combustion mode in which the bottom is intensively heated by a flame. Next, at step 35, the electromagnetic pump 11 is turned on.
If 2 minutes and 30 seconds have elapsed since the start of the procedure, YES and step 3
In step 6, the output of the microcomputer 20 switches the electromagnetic pump 11 from the small oil amount to the medium oil amount supply, and reduces the rotation speed of the combustion fan 18 to 2120 rpm of the medium rotation corresponding to the oil amount. The microcomputer 20 determines whether or not 30 seconds have elapsed since the supply of the medium oil by the electromagnetic pump 11 in step 37, and proceeds to step 38 with YES to turn off the pot heater 7 and set the electromagnetic pump 11 to the set heating power. And the combustion fan 1
8 is shifted to main combustion in which the number of revolutions is in accordance with the thermal power, and the process returns to step 36 if NO. Steps 36 and 37 are the second pre-combustion mode before the transition to the main combustion. The combustion at the normal air-fuel ratio similar to the main combustion is performed for several tens of seconds prior to the main combustion, so that the flame It measures the stability at the time of start-up, and can smoothly shift to main combustion. Therefore, by providing the first pre-combustion for intensively heating the bottom of the pot burner 1 from the pre-heating and the second pre-combustion for measuring the stability of the flame at the time of the main combustion switching, the pot burner can be shortened in a shorter time. 1 can be heated to the temperature at which the main combustion can be performed, the pre-combustion time is greatly reduced, the usability is improved, and the transition to the main combustion is performed smoothly, and good combustion is obtained from the beginning. is there. When a re-ignition operation is performed in a short time when extinguishing a fire,
Since the temperature detection of the pot burner 1 by the temperature sensor 17 reaches 300 ° C. in Step 34, YES is returned to Step 3
6, the second preliminary combustion is performed, that is, the first preliminary combustion is omitted, and the process proceeds to the main combustion without waiting for 2 minutes 30 seconds after the electromagnetic pump 11ON in step 35. When the temperature of the burner 1 is high and a long pre-combustion is unnecessary, the first pre-combustion is automatically omitted, and there is no wasted time until the main combustion, so that the use is extremely convenient. After the second preliminary combustion, the pot heater 7 is turned off.
If a mode of the forced medium heat power for continuing the medium heat combustion of the second preliminary combustion for several minutes after the FF is provided, the transition to the main combustion can be performed more smoothly. In summary, the present invention relates to a pot burner having a plurality of primary air holes and secondary air holes in a peripheral wall, a pot heater mounted on the bottom of the pot burner for performing preheating and ignition, and a pot. It has a temperature sensor to detect the burner temperature.
For example, the transition to the combustion preheating by combustion at the start of the pot heater
And the pot burner is installed by this preheating.
The temperature sensor detects that the temperature has reached a predetermined temperature or more, and performs a first preliminary combustion with a small amount of fuel oil and an excessive amount of combustion air.
Temperature sensor detects a predetermined temperature higher than the predetermined temperature
Or the first pre-combustion has passed for a predetermined time or more.
After performing the second preliminary combustion at the normal air-fuel ratio for a predetermined time,
Since it is obtained so as to shift to the combustion, Pottohi
Intensive heating of the bottom of the pot burner
Heating first pre-combustion and flame stabilization at the time of main combustion switching
By providing the second pre-combustion to measure the performance, po
Can be heated to a temperature at which main combustion can be performed.
Next, the pre-combustion time has been greatly shortened, improving usability
And a smooth transition to main combustion is performed from the beginning.
Good combustion can be obtained. Furthermore, the pre-combustion time can be reduced to several minutes, so that it can be used with confidence even when there is a busy morning or sudden visitor, it is extremely easy to use, and with a smooth transition to main combustion Good combustion can always be obtained without fear of abnormal combustion. When the pot burner is re-burned at a predetermined temperature or higher, the first pre-combustion is omitted, so that unnecessary pre-combustion is eliminated and the time is further reduced, which is extremely convenient.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing a pot type combustor to which an embodiment of the present invention is applied. FIG. 2 is an electric circuit diagram of the main part. FIG. 3 is a flow chart of the main part [Description of symbols] 1 pot burner 2 primary air hole 3 secondary air hole 7 pot heater 11 electromagnetic pump 17 temperature sensor 18 combustion fan 20 microcomputer

Continued on the front page (72) Inventor Yoshinori Aizawa 7-7 Higashi Shinbo, Sanjo City, Niigata Prefecture Inventor Corona (72) Inventor Akira Toyama 7-7 Higashi Shinbo, Sanjo City, Niigata Prefecture Corona Inn (72) Inventor New Makoto Department 7-7 Higashi Shinbo, Sanjo City, Niigata Prefecture Corona Co., Ltd. (56) References JP-A-7-217871 (JP, A) JP-A-3-221718 (JP, A) (58) Fields surveyed (Int .Cl. ⁷ , DB name) F23N 5/14 330 F23N 1/02

Claims (1)

(57) [Claim 1] A pot burner having a plurality of primary air holes and secondary air holes in a peripheral wall, a pot heater mounted on the bottom of the pot burner and performing preheating and ignition , Pot burner temperature
Temperature sensor to detect the temperature, and continue the preheating by the pot heater at the start of combustion until shifting to main combustion.
When the pot burner reaches a predetermined temperature or more due to this preheating,
And the first pre-combustion in which the amount of fuel oil is small and the amount of combustion air is excessive is performed.
If a temperature higher than the predetermined temperature is detected or the first
A pot-type combustor characterized in that, after a predetermined time has elapsed, a second preliminary combustion at a normal air-fuel ratio is performed for a predetermined time, and then the main combustion is started.