JP3283196B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus comprising a heater and a water heater for burning fuel from a main tank outside a main body of an appliance to a sub-tank inside the appliance using a pump. is there.

[0002]

2. Description of the Related Art Conventionally, in this type, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-143019,
By monitoring the operating state of the pump, and forcibly stopping the operation of the pump when the maximum operation duration time is exceeded, the overflow of fuel due to malfunction of the oil level detecting means and the like was prevented. .

[0003]

In the prior art, however, the timer time for restricting the operation of the pumping pump was constant. In use, it takes time for the air to completely escape, and there is a problem that the pump is forcibly stopped before the fuel is supplied to the sub tank. The pump has to be repeatedly turned on and off, which is troublesome in that the operation is troublesome and gives the user an uneasy feeling.

[0004]

The present invention focuses on this point and solves the above-mentioned drawbacks. In particular, the present invention has a pumping pump for pumping fuel from a main tank outside the main body of the apparatus, and
Controlling the pump by detecting the oil level of the sub-tank in a device provided with a sub-tank in the instrument body for storing the fuel oil pumped by the pump and a combustion unit for burning the fuel in the sub-tank Oil level detecting means and the vessel
An initial determination unit that determines the first use of the tool and outputs an initial signal,
Wherein a pump limiting means for limiting the driving pulse number or driving time of the pumping pump at a predetermined value, determines the initial and later in the presence or absence of the first signal from the first determination unit limits of the pump restricting means, first the a limit value varying unit for varying to a large, yet the limit value variable part of the equipment main body side Li
The limit value can be changed to the large side even with the signal from the set switch
It is like that .

[0005]

According to the present invention, when the instrument body 5 is used for the first time, the limit value variable section 15 sets the drive pulse limit value of the pumping pump 9 to a large value and sets the number of pulses to three to five times the normal number.

Accordingly, when the fuel is first pumped from the main tank 7 to the sub-tank 6, even if a large amount of air is accumulated in the oil feed pipe 8, the pump 9 is driven longer by this amount to drive the oil feed pipe 8. The fuel can be surely supplied to the sub-tank 6 while bleeding air.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which a combustion apparatus according to the present invention is applied to a water heater will be described. Reference numeral 1 denotes a heat exchanger provided in the middle of the hot water supply path 2, which is heated by the combustion of the combustion section 3 located below, and appropriately supplies hot water by opening a hot water tap 4 provided at the end of the hot water supply path 2. .

[0008] Reference numeral 5 denotes an appliance main body in which the heat exchanger 1 and the combustion section 3 are installed, and has a structure that can be installed on a wall of a house or the like.

Reference numeral 6 denotes a capacity of about 30 provided in the instrument body 5.
The 0 cc sub-tank receives the supply of fuel oil from a large-capacity main tank 7 installed outside the appliance body 5 and always stores a predetermined amount of fuel oil.

Reference numeral 8 denotes an oil feed pipe connecting the sub tank 6 and the main tank 7, and a pump 9 for pumping up fuel oil on the way.
It has.

Reference numeral 10 denotes an electromagnetic pump for appropriately supplying the fuel oil in the sub-tank 6 to the vaporizing combustion unit 3, and the supply amount is controlled in accordance with the amount of combustion.

A pump 11 is provided in the sub-tank 6 so as to keep the oil level in the sub-tank 6 constant.
A float 12 having an inward magnet (not shown) that moves up and down in accordance with the oil level, and guides the up and down movement of the float 12 to move the magnet inward. On when approaching,
It comprises a main pillar 13 provided with a lead switch (not shown) for turning off at three positions, and starts driving the pumping pump 9 at the lower "empty" position and stops driving at the "full" position. In the "danger" position above this, the entire drive is stopped to detect an abnormal oil level.

Referring now to the block diagram of the main part of the electric circuit shown in FIG. 2, reference numeral 14 denotes an initial determination unit for determining the first use of the appliance, and a voltage value of a backup power supply (not shown) at the time of a power failure. , The first and subsequent times are determined, and the first time signal is output only at the first time.

Reference numeral 15 denotes a limit value variable section for setting the maximum number of driving pulses from the start of driving of the pump 9 when the stop signal from the oil level detecting means 11 is not input.
When there is no first signal from
When the first signal is input, the number of pulses is set to 3 to 5 times the normal number of pulses.

Numeral 16 denotes a pump limiting means for controlling the driving of the pumping pump 9. The pump limiting means 16 counts the number of driving pulses of the pumping pump 9 and compares it with the number of pulses set from the limiting value variable section 15 to determine the number of pulses. When the values match, the pumping pump 9 is stopped.

Reference numeral 17 denotes a reset switch for resetting an abnormal stop state of the appliance. Unlike a simple reset provided in a remote controller (not shown), a switch for resetting an important abnormality of the appliance is provided on a printed circuit board 18 in the appliance body 5. The device is provided to reset the entire instrument by being pressed, and to input the same initial signal as the initial determination unit 14 to the limit value variable unit 15 at the time of reset due to a refueling abnormality.

On the other hand, the pump 9 normally stops in response to a signal from the oil level detecting means 11, but when the oil level detecting means 11 fails, the pump limiting means prevents the oil level from leaking from the sub tank 5. The maximum pulse number is controlled by 16 and the driving time may be used.

The first determining unit 14, the limit value changing unit 15, and the pump limiting unit 16 are constituted by one microcomputer 19.

Next, an embodiment of the present invention is shown in FIG.
The description will be made based on the chart. When the power is turned on, the power frequency is first determined in step 20. At 60 Hz, the drive pulse limit serving as the reference of the 60-Hz pumping pump 9 is set at step 21.
Sets the reference drive pulse limit for 50 Hz.

Since the amount of pumping differs depending on the frequency even with the same number of driving pulses, the number of driving pulses is set in advance so that the amount of pumping becomes the same.

Next, proceeding to step 23, the initial decision unit 14 makes a first decision, and it is decided whether or not the reset switch 17 has been reset due to the "refueling" error. , The drive pulse limit value of the pumping pump 9 is set small, the number of pulses is 1000 to 1100 pulses, and the flow rate is 70 to
80cc.

On the other hand, when the answer is YES for the first time, the process proceeds to step 25, where the limit value of the driving pulse of the pumping pump 9 is 3 to 5 times as large as that of the normal time, and the number of pulses is 3800 to 4000 here. 24 for pulse and flow
0 to 260 cc.

After the setting of the driving pulse, the oil level in the sub tank 6 is detected by the oil level detecting means 11 at step 26, and the "empty" position is detected. Then, fuel oil is pumped from the main tank 7.
Therefore, the pumping is performed while the air is being evacuated, and the number of drive pulses is large and the pump is performed for a long time.

Then, the program proceeds to a step 28, wherein the pump limiting means 1
In step 6, the actual number of pulses is compared with the set value, and it is determined whether refueling is performed within the set number of drive pulses and the oil level reaches the "full" position. The lifting pump 9 is stopped to stop refueling, and step 2
When the set value of the number of pulses is large and the first time, the set value of the number of pulses becomes small in step 24 from the second time.

If the "full" position is not reached even when the number of pulses set at "NO" has been reached, the operation proceeds to step 30 to turn off the pumping pump 9, and proceeds to step 31 to display an error of "refueling". And inform the user that the necessary amount of refueling was not performed due to any abnormalities.
The process returns to step 23. If the reset switch 17 is reset here, the set value of the number of drive pulses becomes large again.

If the oil level of the sub-tank 6 is not at the "empty" position in step 26, NO is returned to step 24, that is, it is not always NO at the first time, but YES, and normally, the routine returns to step 24. Step 26 is repeated until fuel is supplied to the combustion section 3 by the electromagnetic pump 10 and is consumed.

Therefore, in the first use after the installation of the instrument body 5,
The limit value of the driving pulse number of the pumping pump 9 is automatically set to a large value, and the pumping of the fuel oil into the sub-tank 6 is easily performed while bleeding the air accumulated in the oil supply pipe 8. There is no need to repeat the pumping operation many times, which is extremely convenient, and the set value is large only for the first time and becomes a normal limit value after the first time, so that there is no fear of fuel overflowing from the sub tank 6.

Furthermore, since the limit value of the number of drive pulses can be forcibly reset by resetting the reset switch 17 on the instrument body 5 side, even if the air does not escape only once in the first time, the limit value is again set. Can be pumped as large, convenient in emergency and good maintenance.
In addition, since the apparatus is reset at the device main body 5, the pumping state can be checked, and even if there is an oil leak from the sub tank 6, it is safe to perform.

[0029]

In summary, the present invention relates to a pump for pumping fuel from a main tank outside an instrument body, a sub-tank in the instrument body for storing the fuel pumped by the pump, and a fuel tank in the sub-tank. An oil level detecting means for detecting an oil level in the sub-tank and controlling a pumping pump, and a first use of the appliance;
First and first determination unit, a pump limiting means for limiting the driving pulse number or driving time of the pumping pump at a predetermined value, the limit value of the pump limiting means for outputting a first signal to determine the use
Determine the initial and later by the presence or absence of the first signal from the times determining unit
And a limit value changing unit that changes the value so that the first time becomes large .
Even if the signal from the switch changes the limit value to the large side, the pumping of the fuel oil to the sub tank is ensured even at the first time when the air is accumulated in the oil supply pipe. It is extremely convenient because it does not need to be refueled many times, and it can be used with confidence because fuel oil overflow is prevented by dual control of the oil level control and the number of drive pulses.

Further, since the limit value can be increased by operating the reset switch, if refueling cannot be performed even in the first time,
It can be controlled again with the same number of pulses as the first time, and is extremely easy to use.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater provided with a combustion device according to one embodiment of the present invention.

FIG. 2 is a block diagram of a main part of the electric circuit.

FIG. 3 is a flowchart of the main part.

[Explanation of symbols]

 Reference Signs List 3 Combustion unit 5 Instrument body 6 Sub tank 7 Main tank 9 Pumping pump 11 Oil level detection means 15 Limit value variable unit 16 Pump restriction means

Continuation of the front page (56) References JP-A-3-13708 (JP, A) JP-A-2-143019 (JP, A) JP-A-1-41717 (JP, A) JP-A-57-35220 (JP) JP-A-57-37625 (JP, A) JP-A-5-18530 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23K 5/14, 5/16 F23N 1 / 00,5 / 24

Claims (1)

(57) [Claims] 1. A pump for pumping fuel from a main tank outside an instrument body, a sub-tank in the instrument body for storing the fuel pumped by the pump, and a combustion unit for burning the fuel in the sub-tank. In the one with
Oil level detecting means for detecting the oil level of the sub-tank and controlling a pumping pump, and determines the first use of the device and generates an initial signal.
An initial determination unit for outputting, a pump limiting unit for limiting the number of drive pulses or a drive time of the pumping pump to a predetermined value, and a limit value of the pump limiting unit for the first time from the first determination unit.
A limit value variable unit that determines the first and subsequent times based on the presence / absence of a signal and changes the first time to be large , further comprising:
The value variable part is a signal from the reset switch on the instrument body side.
A combustion device characterized in that the limit value is also changed to a large value .