JPH0972540A - Combustion control device - Google Patents

Abstract

(57) [Abstract] [Purpose] This relates to a combustion control device such as a petroleum hot air heater. It improves the usability by extending the combustion time after detecting oil depletion, and at the time of stopping combustion when oil depletion occurs. Reduces sound and odor produced. [Configuration] A signal from the oil amount detection means 4 indicates when the amount of residual oil in the tank 2 is less than or equal to a predetermined amount, and when a predetermined period has elapsed after the detection, the amount of current obtained by the combustion sensor 14 is set to a predetermined value. A combustion sensor control unit 21 is provided, which determines that the combustion is stopped when a predetermined time shorter than the normal time is maintained in a state of falling below the value, and the combustion is stopped, and the combustion stop due to an abnormal combustion signal in the combustion sensor 14 is displayed as a fuel out stop display. When the signal of the oil amount detecting means 4 is equal to or less than the predetermined amount of the remaining oil amount in the tank 2, the abnormality of combustion is detected earlier than usual, and the oil amount detecting means 4 is provided.
Improves the usability by increasing the combustion time after detecting the oil shortage, and quickly detects abnormal combustion such as pulse combustion that occurs when the oil runs out and stops the combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device used in a petroleum hot air heater or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a petroleum hot air heater of this type is a main body case, which is detachably attached to a tank 2 holding liquid fuel on its lower side and an upper portion of the tank 2. A cartridge tank 3 is provided, and the tank 2 is provided with a float type oil level detecting means 4 for detecting the oil level of the fuel in the tank 2. Reference numeral 5 denotes a pump mounted on the upper surface of the tank 2, which supplies fuel from an upper end of the pump to the vaporization section 7 which is kept at a predetermined temperature or higher by the heater 8 and the temperature detecting means 9 through the oil supply pipe 6. There is. Reference numeral 10 denotes a nozzle portion provided at the tip of the vaporization portion 7, which mixes the fuel gas vaporized in the vaporization portion 7 horizontally in the downstream side of the vaporization portion 7 and sucks primary air by its ejector effect. Eject into the tube 11.

Reference numeral 12 denotes a line-shaped burner portion integrated with the mixing pipe 11, which burns the mixed gas from the mixing pipe 11 and near the burner portion, a flame electrode 13 placed in a combustion flame.
A flame rod type combustion sensor 14 for detecting the combustion state by applying a voltage to the burner section 12 and measuring the amount of flowing current is provided. Reference numeral 15 is a combustion cylinder that guides the combustion exhaust gas from the burner unit 12 upward, and a blower 16 that takes in and sends out the indoor air flow is disposed at the back of the combustion cylinder. Reference numeral 17 denotes a duct that mixes the combustion gas from the combustion cylinder 15 and the indoor air flow from the blower 16 to generate warm air.

Further, as shown in FIG. 6, 18 is a pump 5,
A control unit for driving and controlling the heater 8, the blower 16, and the like, is predetermined based on operating condition signals input from the operation unit 19, outputs of the oil amount detection unit 4 and the combustion sensor 14, outputs of the temperature detection unit 9, and the like. The display unit 20 controls the display unit 20 to display the operating conditions of the burner unit 12 and other states.

In the above structure, the vaporizing section 7 is kept at a predetermined temperature or higher by the heating control of the heater 8 by the temperature detecting means 9, and vaporizes the fuel supplied from the pump 5 through the oil supply pipe 6. The vaporized gas is ejected from the nozzle portion 10 at the tip of the vaporization portion 7, the ambient air is sucked and mixed by the generated ejector effect, and the mixed gas is supplied into the burner portion 12 via the mixing pipe 11. It is discharged from the flame hole portion and burned.

The generated gas is guided upward by a combustion cylinder 15 arranged so as to cover the periphery of the burner portion 12, and is mixed with the indoor air flow from the blower 16 by a duct 17 covering the combustion cylinder 15. , Discharged as warm air and used for heating. In the oil warm air heater, when the control unit 18 changes the drive frequency and the applied voltage of the pump 5 to adjust the fuel supply amount based on the operation condition signal input from the operation unit 19,
The primary air amount also increases / decreases accordingly, and the combustion amount can be changed while the fuel / air ratio is kept constant.

Further, when the fuel is used further and the oil level in the tank 2 becomes lower, the control section 18 detects the oil level height by the oil level detection means 4 and the display section 20 runs out of oil. After the display, and driving control of the pump 5, the heater 8, and the blower 16 in a predetermined sequence, the fuel in the tank 2 is further exhausted and the pump 5
The combustion of the burner unit 12 is stopped after a predetermined time has elapsed so that the combustion is stopped before the fuel can no longer be sent.

Further, the control section 18 applies a voltage to the flame electrode 13 and the burner section 12 and controls the combustion state according to the output of the combustion sensor 14 obtained by measuring the amount of current flowing. If the combustion of the burner section 12 causes an abnormality for some reason, for example, if the combustion amount becomes extremely small, the current value decreases and the control section 18
In order to prevent premature disconnection in a normal state, it is determined to be abnormal if the current value is kept below a predetermined value for a predetermined time, and a signal is output to the control unit 18, and the control unit 18 displays the display unit 20. It is designed to display in accordance with the contents of combustion abnormality.

[0009]

However, in the oil warm air heater having such a conventional structure, the fuel in the tank 2 is used less and the oil level in the tank 2 is lowered to lower the oil level. After the oil level detection means 4 detects and causes the display section 20 to indicate that oil is running out, the burner section is operated after a lapse of a predetermined time so that the combustion is stopped before the pump 5 cannot send the fuel because the fuel in the tank 2 is exhausted. Although the combustion of 12 is stopped, the above-mentioned predetermined time is considered in consideration of the variation of the oil level of the oil level detection means 4 and the combustion amount of the burner section 12, that is, the variation of the fuel consumption amount. There was a problem of shortening.

Further, if the above-mentioned predetermined time is set too long in order to improve the usability by increasing the combustion time after the oil level detection means 4 detects the oil shortage, the control unit 18 will run out of oil and the burner unit. If the fuel in the tank 2 is exhausted and the pump 5 cannot deliver the fuel before the combustion of 12 is stopped, the combustion amount in the burner unit 12 becomes extremely small on the way and the combustion sensor 14 detects the above abnormality. Therefore, there is also a problem that the combustion is stopped by the above and the combustion abnormality is displayed on the display unit 20 in spite of the stop of the oil shortage.

In this case, in particular, when the combustion stop due to running out of oil is a normal stop, whereas the abnormal combustion stop indicates a defect in the equipment, the user feels anxious and the abnormal combustion actually occurs. Moreover, there is a fear that the user may continue to use the engine without knowing it, because he mistakenly thinks that the combustion will stop when the oil runs out.

Further, when the oil runs out, the amount of oil fed by the pump 5 sucks and discharges fuel and air, resulting in irregular and excessive fuel supply, and the combustion state in the burner section 12 becomes unstable. If the control unit 18 does not detect abnormal combustion unless the current value of 14 falls below the predetermined value for a predetermined time, the combustion stop time varies, and large pulse combustion may continue for several seconds. At that time,
A strong odor is generated with a bubbling abnormal sound,
There is also a fear of giving the user anxiety and discomfort.

The present invention has solved the above-mentioned problems and has a simple structure, which lengthens the combustion time after the oil level detection means 4 detects oil shortage to improve usability, and the combustion sensor 14 is abnormal. The purpose is to detect combustion and stop combustion earlier than usual when oil runs out, to reduce the noise and odor generated when combustion stops when oil runs out, and to prevent users from feeling uncomfortable. .

[0014]

In order to achieve the above object, the present invention achieves the above object, a tank for storing fuel, an oil amount detecting means for detecting the residual oil amount of the fuel in the tank, and a fuel suction from the tank. A pump for discharging, a burner portion for burning the fuel supplied by the pump, a flame electrode placed in the vicinity of the burner portion and a flame electrode and a burner portion placed in the combustion flame, and the amount of current flowing was measured. A flame rod type combustion sensor for detecting the combustion state by means of, a combustion tube that covers the burner section and guides the combustion exhaust gas generated in the burner section upward, and a combustion tube that covers the combustion tube and the indoor air flow from the blower. It is equipped with a duct for mixing and producing hot air, and a control section for controlling the operating conditions of the pump and the like by receiving signals from the combustion sensor and the like to control combustion in the burner section. When the amount of residual oil in the cylinder is equal to or more than a predetermined amount, if the current value obtained by the combustion sensor falls below the predetermined value and it is held for the first predetermined time, it is judged as abnormal and a combustion abnormal signal is output to the control unit. In addition, when the signal of the oil amount detection means is less than or equal to the predetermined amount of the residual oil amount in the tank, the oil shortage is displayed, and at that time, or after a predetermined period has elapsed after the detection, the combustion sensor was obtained. If the second predetermined time, which is shorter than the first predetermined time, is maintained while the amount of current is lower than the predetermined value, it is determined to be abnormal, and a combustion abnormal signal is output to the control unit to stop combustion, and the combustion sensor The configuration is such that a combustion sensor control unit is provided for displaying the combustion stop due to the abnormal combustion signal of (1) on the display unit as a display indicating that the fuel has run out.

[0015]

According to the present invention, as described above, the combustion sensor control unit detects the combustion abnormality with the combustion sensor earlier than usual when the signal of the oil amount detecting means is less than the predetermined amount of the residual oil amount in the tank. Therefore, abnormal combustion such as pulsating combustion that occurs when oil runs out is detected early and the combustion is stopped so that the user does not feel uncomfortable.

Therefore, since the fuel in the tank is exhausted and combustion continues until the pump cannot deliver the fuel, the combustion time after displaying the oil shortage becomes longer, and the time until refueling can be made longer. User-friendliness is improved.

Further, since the combustion stop due to the abnormal combustion signal in the combustion sensor caused by the inability of the pump to deliver the fuel is indicated on the display unit as the combustion stop indicating that the fuel has run out, an erroneous display can be prevented and safety is ensured. .

Furthermore, since the period during which the combustion stop due to the abnormal combustion signal of the combustion sensor control section is displayed as the combustion stop indicating that the fuel has run out can be shortened, the safety is further enhanced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those of the conventional example are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

In FIG. 1, reference numeral 21 denotes a combustion sensor control unit provided in a part of a control unit 18 for driving and controlling the pump 5, the heater 8, the blower 16, and the like.
The combustion is controlled to be continued or stopped and the display unit 20 is displayed according to the obtained output.

The combustion sensor control unit 21 is constructed as shown in FIGS. 2, 3 and 4, and its construction will be described together with its operation.

The invention shown in FIG. 2 will be described. When the signal from the oil amount detecting means 4 is equal to or more than a predetermined amount of the residual oil amount in the tank 2, the combustion sensor control unit 21 determines whether the current amount obtained by the combustion sensor 14 at 22 is lower than the predetermined value. When it is held for a predetermined time, it is determined to be abnormal, and a signal indicating abnormal combustion is output to the control unit 18 to stop combustion, and the display unit 20 displays abnormal combustion stop. Then, the signal from the oil amount detection means 4 is transmitted to the tank 2
When the residual oil amount in the inside is less than or equal to a predetermined amount, the display unit 20 indicates that the oil has run out, and the current amount obtained by the combustion sensor 14 is higher than the predetermined value after that time or after a predetermined period has elapsed after the detection. In the lowered state, if the second predetermined time shorter than the first predetermined time is maintained, it is determined to be abnormal at 23, a combustion abnormal signal is output to the control unit 18, and the combustion is stopped at 24, and at 25 Combustion stop due to a signal of abnormal combustion in the combustion sensor 14 is displayed on the display unit 20 as a combustion stop indication of running out of fuel.

According to the present invention, the combustion sensor control unit 21 has the above-described configuration, and when the signal from the oil amount detecting means 4 is less than or equal to the predetermined amount of the residual oil amount in the tank 2, the combustion sensor 14 detects the combustion abnormality earlier than usual. Since abnormal combustion such as pulsating combustion that occurs when oil runs out is detected early and combustion is stopped, it is possible to prevent the user from feeling uncomfortable.

Therefore, since the fuel in the tank 2 is exhausted and the pump 5 continues to burn until the fuel cannot be sent, the combustion time after the lack of oil is displayed and the time until refueling can be increased. The usability for the user is improved.

Further, since the combustion stop due to the abnormal combustion signal in the combustion sensor 14 caused by the pump 5 being unable to send the fuel is displayed on the display unit 20 as the combustion stop indicating that the fuel is exhausted, an erroneous display can be prevented and the safety is improved. Can be secured.

Next, in the invention shown in FIG. 3, the combustion sensor control unit 21 obtains the combustion sensor 14 at 26 when the signal from the oil amount detection means 4 is equal to or more than a predetermined amount of the residual oil amount in the tank 2. If the current amount is kept below the first predetermined value for a predetermined period of time, it is determined to be abnormal, and a signal indicating combustion abnormality is output to the control unit 18 to stop combustion and the display unit 20 displays abnormal combustion stop. . When the signal from the oil amount detecting means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2, the display unit 20 displays the oil shortage, and at that time or after a predetermined period has elapsed from the detection, The amount of current obtained by the combustion sensor 14 is the first
If it is held for a predetermined time in a state of being lower than a second predetermined value that is higher than the predetermined value of, it is judged as abnormal at 27, a combustion abnormal signal is output to the control unit 18, and at 28, combustion is stopped, and at 29. The stop of combustion due to an abnormal combustion signal from the combustion sensor 14 is displayed on the display unit 20 as a stop of combustion due to running out of fuel.

According to the present invention, the combustion sensor control section 21 has a faster speed than usual when the signal from the oil amount detecting means 4 is equal to or less than the predetermined amount of the residual oil amount in the tank 2 as in the first configuration. Since the combustion sensor 14 detects abnormal combustion, abnormal combustion such as pulsating combustion that occurs when oil runs out can be detected early and the combustion can be stopped, so that the user does not feel uncomfortable.

Therefore, since the fuel in the tank 2 is exhausted and combustion can be continued until the pump 5 cannot deliver the fuel, the combustion time after displaying the oil shortage becomes longer, and the time until refueling can be made longer. The usability for the user is improved.

Further, since the combustion stop due to the abnormal combustion signal in the combustion sensor 14 caused by the pump 5 being unable to send the fuel is displayed on the display unit 20 as the combustion stop indicating that the fuel is exhausted, an erroneous display can be prevented and the safety can be improved. Can be secured.

Furthermore, when the amount of current obtained by the combustion sensor 14 is lower than the second predetermined value which is higher than the first predetermined value, it is judged to be abnormal when held for a predetermined time, and the control unit 1
Since the signal of abnormal combustion is output to 8,
Compared to the first configuration, the combustion sensor can detect abnormal combustion even earlier than usual, and abnormal combustion such as pulsating combustion that occurs when oil runs out can be detected earlier to stop combustion and prevent the user from seeing it. You can not give a pleasant feeling.

Next, in the invention shown in FIG. 4, the combustion sensor control unit 21 obtains the combustion sensor 14 at 30 when the signal of the oil amount detection means 4 is equal to or more than a predetermined amount of the residual oil amount in the tank 2. When the amount of current is lower than the first predetermined value and the first predetermined time is maintained, it is determined to be abnormal, a signal indicating combustion abnormality is output to the control unit 18, combustion is stopped, and the display unit 20 displays abnormal combustion stop. do. Then, the signal from the oil amount detection means 4 is transmitted to the tank 2
When the remaining oil amount is less than or equal to a predetermined amount, an oil shortage is displayed, and the current amount obtained by the combustion sensor 14 is higher than the first predetermined value after that time or after a predetermined period has elapsed after the detection. When the temperature is kept below the second predetermined value for the second predetermined time, it is judged to be abnormal at 31 and a combustion abnormal signal is output to the control unit 18, and the combustion is stopped at 32, and the combustion sensor at 33. The stop of combustion due to the abnormal combustion signal at 14 is displayed on the display unit 20 as a stop of combustion due to running out of fuel.

According to the present invention, according to the above-mentioned configuration, as in the first configuration, the combustion sensor control unit 21 outputs a signal from the oil amount detecting means 4 which is less than a predetermined amount of the residual oil amount in the tank 2 than usual. Since the combustion sensor 14 detects an abnormal combustion early, abnormal combustion such as pulsating combustion that occurs at the time of oil shortage can be detected early and the combustion can be stopped so that the user does not feel uncomfortable.

Therefore, the fuel in the tank 2 is exhausted and combustion continues until the pump 5 cannot deliver the fuel. Therefore, the combustion time after the oil shortage is displayed becomes longer and the time until refueling can be extended. The usability for the user is improved.

Since the combustion stop due to the abnormal combustion signal in the combustion sensor 14 caused by the inability of the pump 5 to send the fuel is displayed on the display unit 20 as the combustion stop indicating that the fuel is exhausted, an erroneous display can be prevented and the safety is improved. Can be secured.

Furthermore, if the amount of current obtained by the combustion sensor 14 is lower than the second predetermined value which is higher than the first predetermined value and is maintained for the second predetermined time, it is judged to be abnormal and the control unit 18 is burned. Since the abnormal signal is output, the combustion sensor 14 can detect the abnormality of combustion earlier than usual as compared with the first and second configurations, and the abnormality such as pulsation combustion that occurs when oil runs out. It is possible to detect combustion early and stop the combustion so that the user does not feel uncomfortable.

In the above embodiment, the first, second and third
In any of the above configurations, the combustion sensor control unit 21 detects the combustion abnormality with the combustion sensor 14 earlier than usual when the signal from the oil amount detection means 4 is less than or equal to a predetermined amount of the residual oil amount in the tank 2. As a result, the margin of operation of the combustion sensor 14 with respect to the disturbance having no trouble in use, the variation of the combustion sensor 14, and the like becomes smaller than in the normal state, and the premature cutoff easily occurs.

However, this is because the combustion sensor 14 detects an abnormality in combustion earlier than usual after a predetermined time has elapsed after detecting the amount of residual oil in the tank 2 which is equal to or less than a predetermined amount, so that the premature cutoff occurs. Also, in actual use, there is no problem that the combustion time at the time of running out of oil is slightly short, and in consideration of the variation in the actual machine, the combustion sensor 14 can be obtained when the residual oil amount in the tank 2 is equal to or less than a predetermined amount. It suffices to set a predetermined value or holding time for detecting abnormal combustion for the obtained current value.

Further, the oil level detection means 4 using a float or the like for detecting the oil level in the tank 2 is used instead of the oil level detection of the fuel in the tank 2, but this detects the fuel in the tank 2. The combustion sensor control unit 21
Is a method that can detect abnormal combustion detected by the output of the combustion sensor 14 earlier than usual when oil runs out and stop combustion.
At the same time, the method of indicating the stop of combustion when the fuel is exhausted was explained. The configuration of each of the other parts may be any configuration as long as the object of the present invention is achieved.

[0039]

As described above, in the combustion control device of the present invention, the combustion sensor detects abnormal combustion detection earlier than usual when oil runs out so that combustion can be stopped, and when combustion stops when oil runs out. The sound and odor are reduced and the user does not feel uncomfortable. With a simple configuration, the oil level detection means 4 increases the burning time after the oil shortage is detected to improve the usability and the oil shortage. It will be possible to ensure safety by displaying the oil stop indication on the display to indicate that combustion has stopped.

[Brief description of drawings]

FIG. 1 is a block diagram of a combustion control device according to an embodiment of the present invention.

FIG. 2 is a flowchart of the control device.

FIG. 3 is a flowchart of a control device according to the other invention.

FIG. 4 is a flowchart of a control device according to the other invention.

FIG. 5 is a cross-sectional view of an oil warm air heater using the present invention and a conventional combustion control device.

FIG. 6 is a block diagram showing a conventional combustion control device.

[Explanation of symbols]

 2 tank 3 cartridge tank 4 oil level detection means 5 pump 12 burner section 13 frame electrode 14 combustion sensor 15 combustion cylinder 16 blower 17 duct 18 control section 20 display section 21 combustion sensor control section

Claims (4)

[Claims] 1. A tank for storing fuel, an oil amount detecting means for detecting the amount of residual oil in the fuel in the tank, a pump for sucking and discharging the fuel from the tank, and a fuel supplied by the pump. A burner portion to be made, a flame electrode placed near the burner portion and placed in a combustion flame, and a flame rod type combustion sensor for applying a voltage to the burner portion and measuring the amount of current flowing to detect the combustion state. , A combustion tube that covers the burner section and guides the combustion exhaust gas generated in the burner section upward, a duct that covers the combustion tube and mixes the combustion exhaust gas with the indoor air flow from the blower to generate warm air, the combustion sensor, etc. And a control unit that controls the combustion conditions of the burner unit by controlling the operating conditions of the pump and the like when a signal is received and the signal of the oil amount detection means is equal to or greater than a predetermined amount of the residual oil amount in the tank. sensor When the obtained current amount falls below a predetermined value and is maintained for a first predetermined time, it is determined to be abnormal and a combustion abnormal signal is output to the control unit, and the signal from the oil amount detection means indicates the residual oil amount in the tank. When the amount of oil is less than a predetermined amount, it is displayed as running out of oil, and at that time or after a predetermined period has elapsed after detection, the amount of current obtained by the combustion sensor is shorter than the predetermined value and is shorter than the first predetermined time. A combustion control device provided with a combustion sensor control unit that determines that an abnormality has occurred when held for a second predetermined time and outputs a combustion abnormality signal to the control unit. 2. The amount of current obtained by the combustion sensor is the first when the signal from the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank.
If it is held for a predetermined time while falling below the predetermined value, it is judged as abnormal and a signal of combustion abnormality is output to the control unit,
When the signal of the oil amount detection means is less than or equal to a predetermined amount of the remaining oil amount in the tank, the oil amount is displayed, and the current amount obtained by the combustion sensor is displayed at that time or after a predetermined period has elapsed from the detection. 2. A combustion sensor control unit for deciding that an abnormality has occurred when holding for a predetermined time in a state of being lower than a second predetermined value higher than the first predetermined value and outputting a combustion abnormal signal to the control unit. Combustion control device. 3. The amount of current obtained by the combustion sensor is the first when the signal from the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank.
If it is held for a first predetermined time with the value lower than the predetermined value of, it is judged as abnormal and a signal of combustion abnormality is output to the control unit, and the signal of the oil amount detection means is equal to or less than a predetermined amount of the residual oil amount in the tank. Occasionally, an oil shortage is displayed, and after that, or after a predetermined period of time has passed after the detection, the amount of current obtained by the combustion sensor falls below a second predetermined value that is higher than the first predetermined value. 2. The combustion control device according to claim 1, further comprising a combustion sensor control unit that outputs a signal indicating a combustion abnormality to the control unit when it is determined to be abnormal when held for a predetermined time of 2. 4. When the signal of the oil amount detecting means is equal to or more than a predetermined amount of the residual oil amount in the tank, if the current amount obtained by the combustion sensor falls below a predetermined value and is held for a first predetermined time, it is considered to be abnormal. Judgment and output a combustion abnormality signal to the control unit,
When the signal of the oil amount detection means is less than or equal to a predetermined amount of the remaining oil amount in the tank, the oil amount is displayed, and the current amount obtained by the combustion sensor is displayed at that time or after a predetermined period has elapsed from the detection. If the temperature falls below the predetermined value and the second predetermined time shorter than the first predetermined time is maintained, it is judged as abnormal and a combustion abnormal signal is output to the control unit, and the combustion stop is indicated by the abnormal combustion signal at the combustion sensor. 2. The combustion control device according to claim 1, further comprising a combustion sensor control unit that displays a combustion stop indication when the fuel runs out.