JPH058202U - Combustion device - Google Patents

Abstract

(57) [Summary] [Purpose] Maintain a good combustion condition even if the room is under negative pressure. A light transmitting hole 2a is provided in a combustion cylinder 2 located near the upper end of a pot, and a combustion flame A is provided through the light transmitting hole 2a.
When a photodetector 12 for detecting the radiant light of the combustion flame A is provided at a predetermined position outside the combustion cylinder 2 facing the temperature, and when the detection level of the photodetector 12 exceeds a preset value TH,
The number of revolutions M of the combustion blower 5 is increased, and the amount of air supplied to the burner 3 is increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a combustion device equipped with a combustion state monitoring system.

[0002]

[Prior art]

  Generally, a heater is equipped with a combustion blower that supplies combustion air to the burner and a fuel. An oil quantity controller for supplying all the oil is installed.

[0003]   In such a heater, it is installed at the altitude of the place where the heater is installed, that is, in the lowland. Because the air density is different between when installed in a highland and when installed in a highland, If there is a change in the amount of air that is generated and dust is attached to the dust filter, etc. The resistance increases, and the amount of air supplied to the burner tends to decrease. Therefore, It is not possible to maintain the optimum value of the air-fuel ratio, which is the ratio of the supply air amount and the oil amount, and the combustion efficiency Cause a decrease in

[0004]   Therefore, in conventional heaters, when the amount of air supplied to the burner changes, , The amount of air from the combustion blower and the amount of oil from the oil amount controller are based on a predetermined linear function. Control in proportion to the optimum air-fuel ratio even when ventilation resistance changes. Is configured to be obtained.

[0005]   A specific example of controlling the air-fuel ratio is as follows: A small rotation speed range of the blower is set, and a large rotation speed is set by the large rotation speed adjustment volume. Area, and the large oil quantity range is set by the large oil quantity adjustment volume. The linear function of the air-fuel ratio is calculated based on each rotational speed range and the oil amount range. Based on this, the blower for combustion and the oil amount controller are driven.

[0006]   As a result, even if the air density changes or the ventilation resistance changes due to the height of the installation location, The optimum air-fuel ratio can be obtained by responding to changes in air density and ventilation resistance. Combustion control can be performed (for example, see Japanese Patent Application No. 1-142848).

[0007]

[Problems to be solved by the device]

  However, in the above conventional device, a ventilation fan or the like is used for indoor ventilation, When the inside of the room where the heater is installed becomes negative pressure, the above adjustment volumes are operated to Even if it is set to obtain the desired air-fuel ratio, it will be difficult to maintain the optimum air-fuel ratio and combustion failure will occur. There is a possibility of causing good.

[0008]   The present invention has been made in view of such circumstances, and its purpose is a ventilation fan or the like. A stable air-fuel ratio can be obtained even when is used, and it is possible to prevent defective combustion during negative pressure conditions in the room. To provide a combustion device that

[0009]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object, in claim 1, a pot type bar arranged in the lower part of the combustion cylinder. The fuel is supplied by the fuel supply means and the combustion air by the combustion blower to Above the pot in a combustion device that ignites the fuel and heats the combustion cylinder with its combustion flame. A light transmission hole is provided in the combustion cylinder located near the end, and combustion flame is generated through the light transmission hole. A photodetector that detects the emitted light of the combustion flame is installed at a predetermined position outside the combustion cylinder. When the detection level of the photodetector exceeds the preset value, the A control unit was provided to increase the rotation speed of the blower.

[0010]   Further, in claim 2, when the rotation speed of the combustion blower becomes maximum, the photodetector If the detection level is still above the set value, decrease the fuel supply amount of the fuel supply means. A control unit is provided.

[0011]   Further, in claim 3, the fuel supply amount of the fuel supply means is a preset supply amount. If the detection level of the photodetector is still above the set value when After the lapse of time, at least a control unit for stopping the fuel supply by the fuel supply means is provided. .

[0012]

[Action]

  According to claim 1, combustion air and fuel are supplied into the burner pot, When the fuel is ignited, a combustion flame rises in the pot, and the radiant light of this combustion flame is transmitted through the pot. The light leaks from the hole to the outside of the combustion cylinder, and this light is detected by the photodetector.

[0013]   The output detection signal of the photodetector is input to the control unit, and the input level and the A comparison with the installed value is made. As a result, if the input level is above the set value, , The number of revolutions of the combustion blower is increased as a result of poor combustion, The amount of air supplied to the pump is increased.

[0014]   Further, according to claim 2, in the above claim 1, the rotation speed of the combustion blower is the maximum. If the detection level of the photodetector is still above the set value when it becomes large, fuel supply The fuel supply of the means is reduced.

[0015]   According to claim 3, in the above claim 2, the fuel supply amount of the fuel supply means. The photodetector's detection level is still If the value is above the fixed value, at least the fuel is supplied by the fuel supply means after the lapse of a predetermined time. Is stopped and combustion is stopped.

[0016]

【Example】

  FIG. 1 is a block diagram showing an embodiment of a combustion apparatus according to the present invention. In Figure 1 Reference numeral 1 is an oil heater housing, 2 is a combustion cylinder, which is provided inside the housing 1 by radiant heat To heat up. 3 is a pot-type burner, which is arranged at the lower part of the combustion tube 2 and has a side part for combustion. The combustion cylinder 2 is heated by the combustion flame A having the air intake holes 3a. 4 is an ignition heater Then, under the energization control by the control unit 14 which is arranged below the burner 3 and will be described later, -The fuel supplied into the nozzle 3 is vaporized and ignited.

[0017]   Reference numeral 5 denotes a combustion blower, which burns the burner 3 from below the combustion cylinder 2 to the burner 3 through a blower pipe 6. Supply firing air. 7 is an oil amount controller, which has an electromagnetic pump and is installed through an oil feeding pipe 8. A fixed amount of fuel (oil) is supplied into the pot 3.

[0018]   Reference numeral 11 denotes a first photodetector, which is composed of, for example, CdS, and is located at a predetermined position of the combustion cylinder 2. Specifically, the combustion inside the burner 3 is performed through the air intake holes 3a on the side surface of the burner 3. It is arranged at a predetermined position of the combustion cylinder 2 facing the flame A and has a detection signal OT1 which will be described later. Output to the control unit 14.

[0019]   Reference numeral 12 is a second photodetector, which is composed of CdS like the first photodetector 11, A burner is provided through a light transmitting hole 2a provided in the combustion cylinder 2 located near the upper end of the burner 3. 3 is arranged at a predetermined position of the casing 1 facing the combustion flame A radiated above 3 The signal OT2 is output to the control unit 14 described later. In addition, in the light transmission hole 2a of the combustion cylinder 2, A transparent heat resistant glass is provided.

[0020]   The output levels of the detection signals OT1 and OT2 from the first and second photodetectors 11 and 12, respectively. The bell depends on the wavelength of the light received, as shown in FIG. Specifically, combustion flame A The color of bluish color (wavelength near 4500 angstrom) is almost the predetermined value during normal combustion. The value a is maintained. When combustion failure occurs, the color of combustion flame A changes from bluish to yellow (wave Long 5500 angstrom vicinity, and further orange (wavelength 6000 angstrom) The output level gradually increases with the transition.

[0021]   Reference numeral 13 denotes an air guide portion, which is arranged above the first photodetector 11 in the combustion cylinder 2 and is provided with a fuel. A part of the combustion air supplied from the lower part of the burning cylinder 2 to the burner 3 is fed to the first photodetector 11 Reflect downward as if spraying on.

[0022]   Reference numeral 14 is a control unit, which responds to the input of the detection signal OT1 from the first photodetector 11 to cause ignition ignition. Control the energization to the input terminal 4 and input the detection signal OT2 of the second photodetector 12 Control of the blower 5 for combustion and the oil amount regulator 7 for combustion and extinguishing control according to I do. Specifically, if the detection signal OT1 is input during ignition, a predetermined time t1 has elapsed. After that, the power supply to the ignition heater 4 is stopped. When the detection signal OT2 is input, Input level and preset value (hereinafter referred to as set value) TH (for example, wave (Corresponding to the level of 5500 angstroms long) Accordingly, the rotation number M of the blower 5 for combustion and the oil supply amount Q of the oil amount adjuster 7 are controlled. Further, the control unit 14 displays the operating state and the combustion state of the heater on the display unit 15.

[0023]   Next, the operation of the above configuration will be described based on the flowchart of FIG.

[0024]   When an operation switch (not shown) is turned on, the controller 14 energizes the ignition heater 4. And the burner 3 is preheated (S1).

[0025]   When the preheating for the predetermined time t1 is completed (S2), the controller 14 drives the combustion blower 5. The drive signal DR1 is output to the moving part. As a result, the combustion blower 5 rotates at the rotation speed M. The tumbling combustion air passes through the path indicated by the arrow in the figure, that is, the blower pipe 6 and the lower part of the combustion cylinder 2. , Is supplied into the burner 3 through the air intake hole 3a (S3).

[0026]   After a lapse of a predetermined time (for example, 10 seconds) t2 from the start of operation of the combustion blower 5 (S4 ), The control unit 14 outputs the drive signal DR2 to the drive unit of the oil amount regulator 7. By this Then, the supply of fuel into the burner 3 is started via the oil feed pipe 8 (S5).

[0027]   At this time, since the bottom of the burner 3 has been preheated by the ignition heater 4, -The fuel that has flowed into the nozzle 3 is immediately vaporized, and the vaporized gas is the glowing surface of the ignition heater 4. Touch to ignite (S6).

[0028]   When this ignition is normally performed, the combustion flame A fluctuates in the burner 3. By this Light of a wavelength corresponding to the color of the combustion flame A leaks from the air intake hole 3a of the burner 3, This is detected by the first photodetector 11. With this photodetection, the first photodetector 1 The detection signal OT1 having a level corresponding to the wavelength of the light received from (S7).

[0029]   The control unit 14 determines that the normal ignition is performed by the input of the detection signal OT1. The ignition heater 4 is turned off to stop energizing the ignition heater 4 (S8). Also, the ignition of the burner 3 The combustion flame A is radiated to the upper part of the burner 3, and the combustion cylinder 2 is heated by the combustion flame A. The radiant heat heats the room.

[0030]   The radiant light of a predetermined wavelength due to the combustion flame A passes through the light transmission hole 2a of the combustion cylinder 2 to generate the second light. The light is received by the photodetector 12. This allows you to adjust the level according to the wavelength of the received light. Detection signal OT2 is input to the controller 14 (S9). The control unit 14 inputs The input level of the detection signal OT2 and the set value TH are compared (S10). This comparison As a result, when the input level is lower than the set value TH, combustion is normally performed. It is judged that the rotation speed M of the combustion blower 5 and the oil supply amount Q of the oil amount controller 7 are present. Keep it as it is.

[0031]   Also, if the stop switch (not shown) is not operated and the combustion control is being performed, For example, when the fuel burns out, the radiation height of the combustion flame A from the burner 3 becomes low, and The input of signal OT2 is stopped (S11), and this state continues for a predetermined time t3 (S1). 2), the control unit 14 shifts to the fire extinguishing process. That is, the output of the drive signal DR2 is stopped. Then, the drive of the electromagnetic pump of the oil amount regulator 7 is stopped (S13), and the drive signal D The output of R1 is also stopped and the drive of the combustion blower 5 is stopped (S14), and the display unit 15 is displayed. The fact that the combustion has been stopped is displayed (S15).

[0032]   On the other hand, during normal operation, use a ventilation fan, for example Then, the amount of air supplied to the burner 3 by the combustion blower 5 decreases. This allows If combustion failure occurs and the color of combustion flame A is normal combustion (wavelength 5000 Å It changes from near the loom) to a yellow-orange system (wavelength of 5500 angstroms or more).

[0033]   Therefore, the amount of light received by the second photodetector 12 becomes large, and its output detection signal OT2 The higher the level of. Therefore, the control unit 14 performs the comparison operation of step S10. The input level of the input detection signal OT2 is above the set value TH, the drive signal The rotational speed M of the combustion blower 5 is increased by a predetermined rotational speed α by the signal DR1 (S 16). As a result, when the rotation speed M of the blower 5 for combustion increases, The amount of supply air increases.

[0034]   Next, the control unit 14 outputs the detection signal OT2 after the predetermined time t4 (S17). It is determined whether or not the bell is lower than the set value TH (S18). Step S If it is determined in 18 that the level of the detection signal OT2 is lower than the set value TH, Assuming that the combustion has returned to normal, the rotation speed M of the blower 5 for combustion is set to the normal rotation speed. (S19) and returns to step S10.

[0035]   On the other hand, in step S18, if the level of the detection signal OT2 is greater than or equal to the set value TH If it is determined that there is, it is assumed that the combustion has not yet returned to normal combustion The drive signal DR1 is output so that the rotation speed M of the machine 5 becomes maximum Mmax (S20). .

[0036]   After the rotation speed M of the combustion blower 5 is set to the maximum Mmax, a predetermined time t5 elapses (S 21) Again, whether the level of the detection signal OT2 has become lower than the set value TH or not. A determination is made (S22). In step S22, the detection signal OT is detected from the set value TH. If it is judged that the level of 2 is low, it is assumed that the normal combustion is restored and the step Then, the operation proceeds to S19.

[0037]   On the other hand, in step S22, the level of the detection signal OT2 is equal to or higher than the set value TH. If it is determined that there is, it is assumed that the normal combustion has not yet been restored, and the oil amount regulator Adjust the oil amount so that the oil supply amount Q according to 7 decreases to the preset value Qmin. The drive signal DR1 is output to the node 7 (S23).

[0038]   A predetermined time t6 has elapsed after the oil supply amount Q by the oil amount controller 7 was reduced to the set value Qmin. After a lapse of time (S24), the level of the detection signal OT2 becomes lower than the set value TH again. Whether or not it is determined (S25). In step S25, it is detected from the set value TH. If it is determined that the level of the output signal OT2 is low, it is assumed that the normal combustion is restored. , The oil supply amount Q of the oil amount adjuster 7 is set to be in a normal state (S26 ), The operation proceeds to step S19, and the rotation number M of the combustion blower 5 is set to the normal rotation speed. Set to a number.

[0039]   On the other hand, in step S25, if the level of the detection signal OT2 is not less than the set value TH If it is determined that the combustion is normal, the combustion is stopped as if it has not yet returned to normal combustion. In order to do so, the operation shifts from step S13.

[0040]   That is, the output of the drive signal DR2 is stopped to stop the oil supply by the oil amount regulator 7. At the same time (S13), the output of the drive signal DR1 is stopped to stop the supply of combustion air. Stop (S14), and display unit 15 cannot return to normal combustion (combustion failure) Is displayed (S15).

[0041]   As described above, according to this embodiment, the combustion flame radiated from above the burner 3 The state of A is monitored by the second photodetector 12, and the detection level of its detection signal OT2 The amount of air supplied to the burner 3 and the amount of oil supplied to the burner 3 are controlled accordingly. Even if you use a fan to create a negative pressure in the room, you can maintain a good combustion condition. Moreover, it is possible to easily and accurately monitor the abnormal combustion state and the like.

[0042]   Whether the ignition of the burner 3 is correct or not is detected by the combustion of the side of the burner 3 instead of the temperature switch. Since the first photodetector 11 provided in the tube 2 is used, the ignition is performed immediately. It is possible to detect that ignition has occurred, and it is possible to perform ignition control with good response. It

[0043]   Further, a part of the combustion air is disposed above the arrangement position of the first photodetector 11 of the combustion tube 2. Since the air guide portion 13 for guiding the first photodetector 11 to be blown is provided, Excessive temperature rise of the first photodetector 11 provided in the combustion cylinder 2 on the side of the burner 3 It can be suppressed, and the photodetector 11 can be prevented from deterioration.

[0044]

[Effect of device]

  As described above, according to claim 1 or claim 2 or claim 3, ventilation Even if you use a fan to create a negative pressure in the room, you can maintain a good combustion condition. Moreover, it is possible to easily and accurately monitor the abnormal combustion state and the like.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a combustion apparatus according to the present invention.

FIG. 2 is an input / output characteristic diagram of a photodetector according to the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

1 ... Case 2 ... Combustion cylinder 2a ... Light transmitting hole 3 ... Pot burner 3a ... Air intake hole 4 ... Ignition heater 5 ... Combustion blower 6 ... Blower 7 ... Oil quantity controller 8 ... Oil pipe 11 ... First photodetector 12 ... Second photodetector 13 ... Air guide 14 ... Control unit 15 ... Display

Claims (3)

[Scope of utility model registration request] 1. A combustion device for supplying fuel by a fuel supply means and combustion air by a combustion blower to a pot-type burner arranged in the lower part of the combustion cylinder to ignite the fuel and heating the combustion cylinder by the combustion flame. In addition, a light transmission hole is provided in the combustion cylinder located near the upper end of the pot, and a photodetector for detecting the emitted light of the combustion flame is installed at a predetermined position outside the combustion cylinder where the combustion flame is exposed through the light transmission hole. A combustion device comprising: a control unit that increases the number of revolutions of the combustion blower when the detection level of the photodetector exceeds a preset value. 2. A control unit is provided for reducing the fuel supply amount of the fuel supply means when the detection level of the photodetector is still above the set value when the number of revolutions of the combustion blower becomes maximum. The combustion device according to claim 1. 3. When the fuel supply amount of the fuel supply means is reduced to a preset supply amount and the detection level of the photodetector is still at or above a preset value, at least the fuel supplied by the fuel supply means after a predetermined time has elapsed. The combustion apparatus according to claim 2, further comprising a control unit for stopping the supply.