JPH0445315A - Control device for combustion apparatus - Google Patents

Abstract

PURPOSE:To prevent a pump from racing when oil has run out and improve the reliability of a device without affecting a burner by providing a count value comparison means which delivers combustion stop output when count values of a feed oil combustion start counter, which counts the number of restarting of combustion during certain time period of clocking, have been counted up. CONSTITUTION:Even whet forced Hi combustion at the start of combustion occurs while forced Lo combustion at the detection of feed of oil is being carried out, the forced Hi combustion takes precedence to stabilize the combustion. Furthermore, maximum number of times allowed for forced Hi combustion to be carried out during forced Lo combustion without causing the racing of a pump 11 due to shortage of oil is measured in advance, If such number is set, combustion can be stopped before the racing of pump takes place. And since such stoppage of pump is an abnormal one, combustion cannot be stated before a float switch 10 is turned on. Therefore, a display 24 is provided to distinguish a normal combustion stop from those based on a feed oil detection time comparison means 44 or a count value comparison means 46, so that a user is informed of an abnormal stop due to oil shortage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a combustion appliance such as a kerosene fan heater.

2. Description of the Related Art In general, a combustion appliance, such as an oil fan heater, has an external device, an oil tank 3 and a burner 4 inside a bottom plate 2, as shown in FIG. Combustion gas A burned in the burner 4 is blown out together with room air B as warm air C from a looper 7 by a fan 6 attached to a blower motor 5, and is used to heat the room.

FIG. 2 shows the main parts of the oil tank 3 shown in FIG. A pump 11 is attached to supply oil to. FIG. 3 shows an example of a control circuit for this combustion appliance. A power switch 13 is connected to an AC power source 12, and a control circuit 15 mainly including a microcomputer (hereinafter referred to as microcomputer) 14 is connected between both ends a and b, and a contact 16 is connected to the AC power source 12. A series circuit with the sheathed heater 17 for vaporizing kerosene in the burner 4, contact 18, a series parallel circuit of the blower motor 5 and the burner motor 19 for supplying combustion air in the burner 4, contact 2
0, a pump 11, and a series/parallel circuit of an igniter 21 for igniting the kerosene vaporized in the burner 4, respectively. Further, the control circuit 15 is connected to sensors such as an operation switch 13a, a float switch 10, and a thermistor 22 for detecting room temperature, as well as a panel 24 including a light emitting diode 23 that displays the operating status and operation status of the circuit.

In such a configuration, conventionally, the control circuit 15 is closed by closing the power switch 13 and the operation switch 13a.
The microcomputer 14 operates the contacts 16, 18 and 20 to burn kerosene in the burner 4 and generate combustion gas A as shown in FIG. Further, in FIG. 2, while oil remains in the movable tank 9, the oil level maintains the height A, but as the oil in the movable tank 9 runs out, the oil level in the oil tank 3 gradually decreases. The float switch lO decreases to
When the float 25 has fallen to the OFF point B, the signal is input to the microcomputer 14, the refueling lamp 23a in the display panel 24 lights up, and combustion is automatically stopped after a certain period of time. Then, when the movable tank 9 is filled with kerosene and the oil tank 3 is refueled, the oil level in the oil tank 3 gradually increases and the float 2 of the float switch 10 is
5 rises to the ON point of A, the signal is input to the microcomputer 14, and the state becomes ready for operation.

Furthermore, as mentioned above, the time from when the float 25 falls to the OFF point B (hereinafter referred to as refueling detection) and when the refueling lamp 23a lights up until combustion is stopped (hereinafter referred to as refueling detection time) is the time at which maximum combustion occurs. The time to reach point 0 is calculated and set in advance from the time it takes for the oil level to reach point D from point 8 until kerosene is no longer supplied to the pump 11, and the time taken to reach point 0, taking into account the fluctuation of the oil level, etc. .

In recent years, the demand for compact-sized oil fan heaters has been increasing, and the size of the oil tank 3 is also becoming smaller.

Therefore, the refueling detection time had to be shortened.

Therefore, in recent years, most of the compact size fan heaters forcibly reduce the combustion amount to the minimum amount when refueling is detected (hereinafter referred to as forced Lo combustion), and burn for a preset time as the refueling detection time. ing.

Generally, when combustion starts, the burner 4 has not warmed up enough to the temperature suitable for combustion, which tends to cause combustion to become unstable.Also, when combustion starts A method is adopted in which maximum combustion is forcibly continued for a certain period of time (hereinafter referred to as forced H1 combustion).

However, when refueling is detected when forced H1 combustion is performed at the start of combustion as described above, forced O combustion tends to be started, resulting in a contradiction. If it is set in advance to give priority to one or the other, for example, if priority is given to forced Lo combustion when refueling is detected, the state at the start of combustion will become unstable and there is a risk of dangerous conditions such as an oxygen deficiency state occurring. be. Moreover, if priority is given to forced Hi combustion, maximum combustion will continue for a certain period of time. but,
After a certain period of time has elapsed, forced Lo combustion occurs and continues until the refueling time has elapsed. However, the user turned on the operation switch 13.
When turning OFF and then ON again, or when the fan heater function automatically repeats the stop and start of combustion under certain conditions, the refueling time may be exceeded by repeating this even while refueling is being detected. The maximum combustion amount will be maintained, and the remaining amount of kerosene will fall below point D.

As a result, the pump 11 runs dry, resulting in a misfire while emitting a foul odor from the burner, which also affects the performance of the pump itself, making it dangerous to use.

The present invention was made in view of these points, and aims to prevent the pump from running dry when the oil runs out, without adversely affecting the burner, and to improve the reliability of the equipment. be.

Means for Solving the Problems In order to achieve the above object, the control device for a combustion appliance of the present invention includes a tank for storing oil, a fuel supply means such as a pump for supplying oil, and a fuel supply means supplied by the fuel supply means. A burner that vaporizes and burns oil, an oil level sensor that detects the oil level height in the tank, and control that controls the burner and the pump etc. based on a signal from the oil level sensor. and a refueling detection time measuring means for measuring combustion time after the curved surface sensor detects that the oil level height in the tank is below a predetermined value; and a refueling detection time measuring means. refueling detection time comparison means that outputs a combustion stop output after the combustion continues for a preset fixed period of time measured by the refueling means; The combustion engine is configured to include a combustion start counting means and a counter value comparing means for outputting a combustion stop output when the count value of the refueling combustion start counting means counts up.

Effect of the Invention With the above configuration, the present invention can make the combustion amount the maximum combustion amount when the combustion is stopped and restarted after refueling is detected, and the instability at the start of combustion can be eliminated. Moreover, since the number of re-combustions is counted and the combustion is stopped when the number of re-combustions reaches a certain number, it is possible to prevent the pump from running dry.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

Since the main body structure and circuit structure are the same as those of the conventional example, FIGS. 1, 2, and 3 will be used, and the same parts as those of the conventional example will be denoted by the same reference numerals, and detailed explanation will be omitted. FIG. 4 is a block diagram of the control part of the oil hot air fan heater to explain this embodiment based on the circuit configuration shown in FIG. 42 is a refueling detection determining means that determines whether or not refueling is being detected based on an instruction from the float switch IO; 43 is a refueling unit that measures the time during which refueling is being detected as determined by the refueling detection determining means 42; Detection time measuring means, 44
Refueling detection time comparison means compares the time measured by the refueling detection time measuring means 43 with a preset time to determine whether or not it has elapsed; 45 determines how many times combustion has been started during refueling detection; The refueling combustion start counting means 46 is a counter value comparison means that compares the value counted by the refueling combustion start counting means 45 with a preset value to determine whether or not the count has been increased. A combustion control unit 47 determines whether to stop or start combustion, determines the amount of combustion, etc. based on instructions from the combustion start determination means 41, the refueling detection time comparison means 44, and the counter value comparison means 46, and issues instructions to operate the load. Department,
48 is a load section that operates according to instructions from the combustion control section 47;
This refers to the sheathed heater 17, burner motor 19, blower motor 5, pump 11, igniter 21, etc. in FIG.

Next, the control procedure for each configuration explained in FIG. 3 will be explained using the flowchart in FIG. 5. In step 51, an instruction signal from the operation switch 13a is input, and the combustion start determining means 41 determines whether combustion is to be started or stopped. If combustion has started, the process advances to step 52; if combustion has stopped, step 51 is repeated until a combustion start instruction signal is input. In step 52, when an instruction signal is sent from the combustion start determining means 41 to the combustion control section 47, a forced Hi combustion timer in the combustion control section 47 is started to perform forced Hi combustion at the start of combustion. In step 53, the refueling detection and determination means 42 determines that the float switch 10 is already OFF at the start of combustion.
If refueling is detected, the process proceeds to step 54, where the counter value of the refueling combustion start counting means 45 is updated. If refueling is not detected, the process proceeds to step 55, where the counter value of the refueling combustion start counting means 45 is cleared to the initial value. Step 56
Then, the counter value comparing means 46 determines whether the counter value counted in step 54 has counted up to a preset value, and if it has counted up, the process proceeds to step 67 in order to stop the combustion as it is assumed that the oil is out. . If the count has not been counted up, the process advances to step 57 to move on to the combustion operation. In step 57, the combustion start determining means 41 determines whether the combustion start determined in step 51 has ended and should be stopped, and if it should be stopped, the process proceeds to step 58, where the combustion control section 47 controls the load section to perform a stop process. 48 and repeat step 5.
Return to step 1, and if it is not necessary to stop, proceed to step 59,
The process proceeds to the combustion operation. In step 59, the refueling detection determining means 42 determines whether or not the float switch 10 has detected 0FFL refueling during combustion. If refueling has been detected, the process advances to step 60; if refueling has not been detected, step 61
In step 60, since refueling is being detected, the refueling lamp 23a in the display panel 24 is turned on, and step 6
1, the refueling lamp 23a is turned off because refueling is not being detected. In step 62, the refueling detection time measuring means 43 measures the refueling detection time. In step 63, it is determined whether the forced H1 combustion timer started in step 52 has timed up. If it has timed up, the process proceeds to step 64, in which the combustion control section 47 controls the load section 48 to perform forced Lo combustion during refueling detection. control. Also,
If the time has not expired, the process proceeds to step 65, where the combustion control section 47 controls the load section 48 to perform forced Hi combustion at the start of combustion.

In step 66, it is determined whether the refueling detection time measured by the refueling detection time measuring means 43 has timed up;
If the time has expired, the process advances to step 67; if the time has not expired, the process ends and the process returns to step 57. In step 67, the combustion control unit 47 controls the load unit 4B to perform combustion stop processing due to oil shortage, and in step 68, a warning is issued by the refueling lamp 23a or buzzer. In step 69, since refueling is not detected, normal operation is performed. First, the time measurement by the refueling detection time measurement means 43 is ended. In step 70, the counter value of the refueling combustion start counting means 45 is cleared to the initial value. In step 71, it is determined whether the forced H1 combustion timer started in step 52 has timed up. If it has timed up, the process proceeds to step 72, where the combustion control section 47 controls the load section 48 to perform normal combustion. If the time has not been up, the process advances to step 65 and the forced H level at the start of combustion is
A combustion control section 47 controls a load section 48 to perform i-combustion. After completing the above processing, the process returns to step 57 again, and the processes from step 57 to step 72 are repeated until the combustion stop processing is instructed.

According to the configuration of the above embodiment, even if forced Hi combustion at the start of combustion overlaps with forced O combustion when refueling is detected, forced H1 combustion can be given priority and combustion can be stabilized, and moreover, during forced Lo combustion By measuring in advance how many times forced HI combustion must occur before the pump runs dry due to oil starvation and setting the number of times, it is possible to stop combustion before the pump runs dry. .

Furthermore, since the combustion is stopped when an abnormality occurs, combustion must not be started until the float switch 10 is turned on. Therefore, in order to solve the above-mentioned situation, there is provided a display/alarm means for displaying or warning to distinguish between the combustion stoppage by the refueling detection time comparison means, the combustion stoppage by the counter value comparison means, and the normal combustion stoppage. By providing this information on the display panel 24, it is possible to notify the user of an abnormal stop due to lack of oil.

The above embodiment is shown as an example of the present invention, and any configuration may be used as long as it achieves the purpose and effect of the present invention, and a microcomputer may be used as the control section. However, a circuit configuration that can perform similar control without using a microcomputer may also be used.Furthermore, a float switch is used as the oil level detection sensor, but if the oil level exceeds a certain level Any method can be used as long as it can determine whether the oil level is below or below, such as a method that floats a float on the oil surface and turns a switch connected to it on or off at a certain oil level, or an optical sensor that detects the oil level. It's okay.

Effects of the Invention As described above, according to the present invention, the combustion amount can be set to the maximum combustion amount when combustion is stopped and restarted after refueling is detected, and instability at the start of combustion can be eliminated. Moreover, by counting the number of reburns during refueling detection,
It also prevents the pump from running dry, leading to improved pump reliability and equipment safety.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the present invention and a conventional combustion appliance;
The figure is an enlarged sectional view of the tank section, Figure 3 is a control circuit diagram of a combustion appliance showing an embodiment of the present invention, Figure 4 is a block diagram showing the details of the control, and Figure 5 is the content of the control. It is a flowchart. 3... Fixed tank, 4... Burner, 10... Flow switch, 11... Pump (fuel supply means), 15
. . . control circuit, 41 . . . combustion start determination means, 42.
... Refueling detection determining means, 43... Refueling detection time measuring means, 45... Refueling combustion start counting means, 44...
Refueling detection time comparison means, 46... Counter value comparison means, 47... Combustion control unit. Name of agent Patent attorney Shigetaka Awano Haka1 person Figure 3- Dunk 10---F〇-Tosuite Figure 10-1-Footsuite/611-114@0 bribe diagram

Claims (2)

[Claims] (1) A tank that stores oil, a fuel supply means such as a pump that supplies oil, a burner that vaporizes and burns the oil supplied by the fuel supply means, and detects the oil level height in the tank. The control circuit includes an oil level sensor and a control circuit that controls the burner and the pump etc. based on a signal from the oil level sensor, and the control circuit is configured to control when the oil level level is determined by the oil level sensor in the tank. a refueling detection time measuring means that measures the combustion time after detecting that the combustion time is below a predetermined value; Refueling detection time comparison means that outputs a stop output; Refueling combustion start counting means that counts the number of times re-combustion occurs during the measurement of the predetermined time; and when the count value of the refueling combustion start counting means counts up, combustion is stopped. A control device for a combustion appliance comprising a counter value comparison means for outputting an output. (2) Claim 1, further comprising a display/alarm means for displaying or warning to distinguish between combustion stoppage by the refueling detection time comparison means, combustion stoppage by the counter value comparison means, and normal combustion stoppage. Control device as described in section.