JPH0735348A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To provide a combustion apparatus of electric charge control type, for which adjustment of rotation frequency of a fan by an operator is not required. CONSTITUTION:Respective standard electric currents preset corresponding to first and seventh speeds are introduced to a fan motor 41, and are corrected so as to have respective detected rotation frequencies corresponding to respective target rotation frequencies which are preset corresponding to the first and seventh speeds. A correction value when the detected respective rotation frequencies correspond to the respective target rotation frequencies is stored in a E- PROM 6 for adjustment of rotation frequencies. In a normal operation, an amount of electric current introduced to the fan motor 41 is determined on the basis of a corrected value of electric current, for which a standard electric current is corrected by a corrected value read out from the EPROM 6, and an amount of combustion as determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device equipped with a blower.

[0002]

2. Description of the Related Art For example, a hot air heater has a burner that burns at a combustion amount determined based on a difference between a set temperature and a detected room temperature, a blower that supplies combustion air to the burner, and a determined combustion amount. And a controller for controlling the blower so that corresponding air is supplied to the burner.

A semi-fixed resistor is provided in the equipment to prevent the combustion amount-blower rotation speed characteristic from varying from device to device due to variations in the blower characteristics (energization amount-revolution speed curve). A person who adjusts a semi-fixed resistor at the time of shipment to obtain the same number of rotations for the same amount of electricity has been put into practical use a hot air heater of an electricity amount control type (conventional example 1). ).

Also, a hot air heater is provided with a rotation speed sensor such as a Hall IC in the blower, and feedback control (so-called rotation speed control) is performed so that the blower rotates at a rotation speed corresponding to the determined combustion amount. It has been put to practical use (conventional example 2).

[0005]

The hot-air heater of Conventional Example 1 has the following drawbacks. (A) It is necessary for an operator to adjust each semi-fixed resistor one by one, and if the slider moves due to vibration during transportation, the adjustment value will be deviated.

The hot-air heater of Conventional Example 2 has the following drawbacks. (A) For example, as the filter provided at the air suction port progresses to be clogged, the amount of air passing through decreases, and therefore the rotational speed of the blower tends to increase. However, in the rotation speed control, the control works so as to reduce the amount of electricity supplied to the blower in order to maintain the target rotation speed, so that even a slight clogging of the filter greatly reduces the air flow rate. Therefore, the width of the good combustion region is narrow, and the temperature inside the heater rises, so that the combustion with a safety device frequently stops.

(C) In order to increase the number of rotations of the blower so that the amount of passing air does not decrease even if the filter is clogged, the combustion amount-rotational speed curve should correspond to the clogging amount. Need to shift.

Further, in the case where a louver is provided at the hot air outlet and the blowing direction of the warm air is changed by the louver, it is necessary to change the combustion amount-rotation number curve in accordance with the operating state of the louver.

Therefore, since it is necessary to control the blower in consideration of many parameters, the man-hours for development increase and the control becomes complicated.

An object of the present invention is to provide an energization amount control type combustion device which does not require the operator to adjust the rotation speed of the blower.

[0011]

[Means for Solving the Problems] In order to solve the above problems,
The present invention relates to a combustion amount determining means for determining a combustion amount based on a difference between a detected temperature and a set temperature, a burner that burns at the determined combustion amount, a blower that supplies combustion air to the burner, and the blower. In a combustion device comprising a rotation speed detection means for detecting the rotation speed of the, a storage device, and a controller for controlling the blower, the controller is preset for each of a predetermined small / large combustion amount. The reference current is supplied to the blower, and the reference currents are corrected so that the detected rotation speeds match the preset target rotation speeds corresponding to the predetermined small and large combustion amounts, and the detected rotation speeds are changed. The fan rotation speed is adjusted by storing each correction value when it reaches the target rotation speed in the storage device, and during normal operation, the correction current value is obtained by correcting each reference current with each correction value read from the storage device. , The combustion amount determined by the combustion amount determining means Employing the configuration to determine the energization amount to the blower based.

[0012]

Operation: The combustion device has a
In addition to the normal operation, a blower rotation speed adjustment mode for automatically adjusting the rotation speed of the blower is provided. In this adjustment mode, the controller energizes the blower with a reference current corresponding to a predetermined small / large combustion amount, and detects the rotation speed by the rotation speed detection means so that the detected rotation speed matches the target rotation speed. Then, the reference current is adjusted, and the correction value when the detected rotation speed becomes the target rotation speed is stored in the storage device.

In the normal operation mode, the controller is
The blower is energized with an energization amount determined based on the current value obtained by correcting each reference current with each correction value read from the storage device and the combustion amount determined by the combustion amount determining means.

[0014]

In the blower rotation speed adjustment mode, the reference current is automatically adjusted so that the detected rotation speed becomes the target rotation speed provided corresponding to the predetermined small / large combustion amount, and the detected rotation speed is the target rotation speed. The correction value at which is stored in the storage device. Therefore, the operator does not have to perform the troublesome work of adjusting the semi-fixed resistor by detecting the number of rotations, and there is no fear that the adjustment is deviated due to vibration during transportation.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. A gas warm air heater A shown in the figure is arranged in a duct 1 and burns at a combustion level of 1st speed to 8th speed.
And a proportional valve 3 for adjusting the amount of gas supplied to the gas combustor 2.
, A convection fan 4 that also serves as a hot air blower and a supply of combustion air to the gas combustor 2, a Hall IC 5 that detects the rotation speed of the convection fan 4, and an E ² PROM 6 that stores a correction value.
And a control unit 7 for controlling the current supplied to the fan motor 41 of the convection fan 4 and the proportional valve 3 and the like. Again 3
1 is a gas pipe, 8 is a heater housing, 81 is indoor air k
Is an air guiding path for guiding the gas to the gas combustor 2, and 811 is a thermistor for detecting room temperature.

The duct 1 is provided with a hot air outlet 11, an indoor air inlet 13 covered with a filter 12, and a combustion air inlet 14.

The gas combustor 2 includes a combustion plate 21, a combustion cylinder 23 having a sparker sp and a thermocouple 22, a gas g ejected from a nozzle n arranged downstream of the air guide passage 81, and an air guide passage. The mixing chamber 24 mixes the indoor air k guided by 81.

The proportional valve 3 is a solenoid valve 31 of the gas pipe 31.
This valve is provided on the downstream side of Nos. 1 and 312 and adjusts the gas amount of the gas g ejected from the nozzle n, and the passing gas amount increases or decreases in proportion to the energization amount. Further, the proportional valve 3 has a gas governor for keeping the secondary side gas pressure constant, and the gas governor is further equipped with a gas amount adjusting screw for adjusting the gas supply amount at the first speed combustion level.

The convection fan 4 comprises an impeller 42 pivotally mounted in the duct 1 downstream of the gas combustor 2 and a fan motor 41 for driving the impeller 42.

The control unit 7 having a micro computer includes an adjustment mode sequence control unit 701, a reference current value storage unit 702, a rotation speed detection unit 703, and a rotation speed comparison unit 7.
04, reference current value correction unit 705, correction value writing unit 706,
Fan energization circuit 707, combustion speed number determination unit 708, energization curve storage unit 709, energization curve correction unit 710, correction value reading unit 711, operation control circuit 712, proportional valve drive circuit 71.
Have three.

The adjustment mode sequence control unit 701 includes a reference current value storage unit 702 and a rotation speed detection unit 7 when the adjustment mode switch SW ₁ such as a tact switch is on the adjustment side.
03, rotation speed comparison unit 704, reference current value correction unit 705,
The correction value writing unit 706 and the fan energization circuit 707 are put into the operating state to put the gas warm air heater A into the rotation speed adjustment mode. When the adjustment mode switch SW ₁ is on the normal operation side, the combustion speed number determination unit 708 and the energization curve storage unit 70 are also provided.
9, the energization curve correction unit 710, the correction value reading unit 711, the operation control circuit 712, and the proportional valve drive circuit 713 are put into the operating state, and the gas warm air heater A is set to the normal operation mode.

The reference current value storage unit 702 stores reference current values corresponding to the combustion speeds of 1st speed and 7th speed, and at the time of adjustment, the reference currents I _L and I _H (however, if correction is applied, I _L
The fan energization circuit 707 is controlled so that + H _L , I _H + H _H ) flows to the fan motor 41.

The rotation speed comparison unit 704 compares the target rotation speeds (Lo, Hi) corresponding to the combustion speeds of 1st speed and 7th speed with the detected rotation speeds detected by the rotation speed detection unit 703.

When the target rotation speed (Lo, Hi) is different from the detected rotation speed, the reference current value correction unit 705 sets the reference currents I _L and I _H of the reference current value storage unit 702 to ± 1 m.
Add A corrections.

The correction value writing unit 706 controls the target rotation speed (L
o, Hi) and the detected rotational speed match, the correction values H _L , H
Store _H in E ² PROM6.

The combustion speed number determination unit 708 is the room temperature setting device 82.
Calculation is performed based on the set room temperature set in step 1 and the room temperature detected by the thermistor 811, and the combustion level is determined to be one of the first speed to the eighth speed. Incidentally, the seventh speed of the combustion level is the rated combustion amount, and the eighth speed of the combustion level is the maximum combustion amount used only during the rapid operation at the initial ignition start.

The energization curve storage unit 709 is shown in FIG.
The combustion speed-reference current I _L and I _H curve characteristics are stored.

As shown in FIG. 5, the energization curve correction unit 710 corrects the combustion speed number-reference currents I _L and I _H curves with the read correction values H _L and H _H , and the combustion speed number-current (current I _L +
H _L), to control (I _H + in H _H) curve, the fan energization circuit 707 as to be energized to the fan motor 41.

The operation control circuit 712 has an operation switch SW.
_{When 2} is turned on, the sparker sp is operated for a predetermined time to energize the solenoid valves 311 and 312 to ignite the gas combustor 2, and during the on period, energize the solenoid valves 311 and 312 to maintain a combustion state. To maintain.

Next, the operation of the control unit 7 will be described with reference to FIG.
Description will be given based on each flowchart in FIG. In the adjustment mode, in step s1, the first-speed reference current I _L
Then, the fan motor 41 is energized, the correction value H _L = 0 is executed, and the process proceeds to step s2.

In step s2, it is determined whether or not the detected rotation speed = the target rotation speed. If the detected rotation speed ≠ the target rotation speed (NO), the process proceeds to step s3, and the detected rotation speed = the target rotation speed. If (YES), the process proceeds to step s10.

In step s3, it is determined whether or not the detected rotation speed> the target rotation speed. If the detected rotation speed> the target rotation speed (YES), the process proceeds to step s4, and the detected rotation speed <the target rotation speed. If (NO), the process proceeds to step s7.

In step s4, the reference current I _L = reference current I _L -1 mA is executed, and the process proceeds to step s5.

In step s5, correction value H _L = correction value H _L
After executing -1, the process proceeds to step s6.

In step s6, it is determined whether or not 0.5 second has elapsed. If 0.5 second has elapsed (YES), step s
Return to 2.

In step s7, the reference current I _L = reference current I _L +1 mA is executed, and the process proceeds to step s8.

In step s8, correction value H _L = correction value H _L
After executing +1, the process proceeds to step s9.

In step s9, it is determined whether or not 0.5 second has elapsed. If 0.5 second has elapsed (YES), step s
Return to 2.

In step s10, the correction value H _L is stored,
Go to step s11.

In step s11, the fan motor 41 is energized with the seventh-speed reference current I _H , the correction value H _H = 0 is executed, and the process proceeds to step s12.

In step s12, it is determined whether or not the detected rotation speed = the target rotation speed. If the detected rotation speed ≠ the target rotation speed (NO), the process proceeds to step s13, and the detected rotation speed = the target rotation speed. If (YES), the process proceeds to step s20.

In step s13, it is determined whether or not the detected rotation speed> the target rotation speed. If the detected rotation speed> the target rotation speed (YES), the process proceeds to step s14 and the detected rotation speed <
If it is the target rotation speed (NO), the process proceeds to step s17.

In step s14, the reference current I _H = reference current I _H -1 mA is executed, and the process proceeds to step s15.

In step s15, the correction value H _H = correction value H
After executing _H -1, the process proceeds to step s16.

In step s16, it is determined whether or not 0.5 second has elapsed. If 0.5 second has elapsed (YES), the process returns to step s12.

In step s17, the reference current I _H = reference current I _H +1 mA is executed, and the process proceeds to step s18.

In step s18, the correction value H _H = correction value H
After executing _H + 1, the process proceeds to step s19.

In step s19, it is determined whether or not 0.5 second has elapsed. If 0.5 second has elapsed (YES), the process returns to step s12.

In step s20, the correction value H _H is stored,
The rotation speed adjustment of the fan motor 41 ends.

Next, the operation of the control unit 7 in the normal operation mode will be described with reference to FIG.

In step S1, the correction value reading unit 711 outputs E
^{2 The} correction values H _L and H _H corresponding to the combustion speed of 1st speed and 7th speed are read from the PROM 6, and the energization curve correction unit 710
The combustion speed-reference currents I _L and I _H curves stored in the energization curve storage unit 709 are corrected with the correction values H _L and H _H.

In step S2, the combustion speed-current (I _L + H _L ) and (I _H + H _H ) curves are obtained by correcting the combustion speed-reference currents I _L and I _H curves with the correction values H _L and H _H. Then, the fan motor 41 is energized.

Next, the advantages of the gas warm air heater A will be described. [A] When the adjustment mode switch SW _{1 is set} to the adjustment side at the time of completion of assembly or readjustment, the control unit 7 detects the target rotation speed (Hi, Lo) corresponding to the combustion speed of 1st speed and 7th speed. The reference currents I _L and I _H are corrected so as to arrive at the correction value H _L and H _H are stored in the E ² PROM 6, and the rotation speed is automatically adjusted.

Then, the control unit 7 reads the correction values H _L and H _H from the E ² PROM 6 during normal operation,
The fan motor 41 is energized by a straight line connecting the corrected first-speed and seventh-speed energization current values, that is, a combustion speed-current (I _L + H _L ), (I _H + H _H ) curve.

That is, since the rotation speed is automatically adjusted, the operator does not have to perform the troublesome work of adjusting the semi-fixed resistor while detecting the rotation speed. Moreover, since a semi-fixed resistor is not used, there is no fear that the adjustment will be misaligned due to vibration during transportation.

[B] Since the gas warm air heater A is of the energization amount control type during the normal operation, it is possible to eliminate the drawbacks of the rotation speed control type (the above-mentioned a and c).

That is, even if the filter is clogged, the amount of electricity to the fan motor 41 does not change (decrease), so that the good combustion range can be widened and the duct 1 does not become overheated. Further, since the energization amount control method is used, the development man-hours are small and the control of the fan motor 41 is simple.

[U] Since the E ² PROM 6 is used as the memory, the stored correction values H _L and H _H never disappear.
No backup power supply is required.

The present invention is not limited to the above embodiment
Including. a. In the above embodiment, the detected rotation speed matches the target rotation speed.
Until the reference current I_L, I _HIs increased or decreased by 1 mA
Predicts the convergence value from the difference between the detected rotation speed and the target rotation speed.
You may choose to do so.

B. The rotation speed of the fan motor 41 may be adjusted not from the first speed side but from the seventh speed side.

C. In the above embodiment, the configuration of the present invention is applied to a warm air heater as a combustion device, but any combustion device including a blower such as a water heater can be applied.

D. In the above embodiment, the combustion amount is changed stepwise, but it may be changed proportionally.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a gas warm air heater according to an embodiment of the present invention.

FIG. 2 is a block diagram of the gas warm air heater.

FIG. 3 is a flowchart showing an operation (at the time of adjustment) of a control unit in the gas hot air heater.

FIG. 4 is a flowchart showing an operation (at the time of adjustment) of a control unit in the gas warm air heater.

FIG. 5 is a graph showing combustion speed-current carrying characteristics in the gas warm air heater.

FIG. 6 is a flowchart showing an operation (during normal operation) of a control unit in the gas warm air heater.

[Explanation of symbols]

A gas warm air heater (combustor) 2 gas combustor (burner) 4 convection fan (blower) 5 Hall IC (rotation speed detection means) 6 E ² PROM (memory) 7 control unit (controller) 708 combustion speed Number determination unit (combustion amount determination means) _IL , _IH reference current _HL , _HH correction value

Claims (1)

[Claims] 1. A combustion amount determining means for determining a combustion amount based on a difference between a detected temperature and a set temperature, a burner which burns with the determined combustion amount, a blower which supplies combustion air to the burner, In a combustion device including a rotation speed detection unit that detects a rotation speed of a blower, a storage device, and a controller that controls the blower, the controller is preset in correspondence with a predetermined small / large combustion amount. Apply each reference current to the blower and correct each reference current so that each detected rotation speed matches each preset target rotation speed corresponding to the predetermined small / large combustion amount. The blower rotation speed is adjusted by storing each correction value when it reaches each target rotation speed in the memory, and during normal operation, the correction current value obtained by correcting each reference current with each correction value read from the memory. And the combustion amount determining means determines Combustion apparatus, characterized in that to determine the energization amount to the blower based on the combustion rate.