JPH0533927A - Method for adjusting gun type burner - Google Patents

Abstract

PURPOSE:To perform an accurate and automatic adjustment and correction of the characteristics of nozzle position rate of injection combustion by a method wherein the first nozzle position after correction and a variation in rate of combustion in respect to a unit amount of movement of the nozzle are stored in an external memory. CONSTITUTION:An adjustment switch in a controller is turned on, and automatic adjustment is carried out in accordance with a specified program. The first nozzle position L11 got through the adjustment and a variation K1 in the amount of combustion in respect to a unit amount of movement of a nozzle 11 are effectively utilized for calculation of the position of the nozzle 11 until the subsequent adjustment is performed. Letting a reference rate of combustion be P1 and a required rate of combustion be P, the position L of the nozzle 11 is calculated under an equation of L = L11 + (P-P1)/K1. Accordingly, the variation K1 of the rate of combustion in respect to a unit amount of movement of the nozzle 11 as well as the position L11 of the first nozzle 11 is adjusted in advance, thereby an accurate and efficient control over the position of the nozzle 11 rate of injection combustion can be performed even if there are a disturbance of the nozzle 11, a back-lash of a driving system, a looseness of the driving system and a disturbance of fuel and the like.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for adjusting a gun type burner.

[0002]

2. Description of the Related Art Conventionally, as a fuel proportional control method for an oil combustor, there is a method for controlling the amount of oil ejected from a gun type spray nozzle. There is a method in which a spray throttle plate having an opening of a certain area is provided, and the distance between the throttle plate and the nozzle is changed to control the spray amount reaching the combustion cylinder.

[0003]

However, in the above method, the spray amount, the spray angle, and the backlash / backlash of the nozzle driving mechanism that changes the distance between the diaphragm plate and the nozzle and the quality of the fuel in the above method are varied. There is a problem that the nozzle position-spray combustion amount characteristic does not fall within a certain range due to the variation of. Further, if the nozzle drive mechanism or the like is replaced or repaired for maintenance, the nozzle position-spray combustion amount characteristic changes, and it is necessary to readjust, but it is often difficult to prepare adjustment equipment at the installation site.

In view of the above, the present invention solves the above-mentioned drawbacks of the prior art, and is capable of automatically and accurately adjusting and correcting the characteristics of nozzle position-spray combustion amount, and is easy to adjust even during maintenance. The purpose is to provide a method for adjusting the burner.

[0005]

The method of the present invention comprises a spray diaphragm having a constant opening, a nozzle for spraying fuel,
Driving means for moving the nozzle to change the distance from the diaphragm plate and a controller with a built-in microcomputer for controlling the driving means are provided, and the diaphragm plate is changed by changing the distance between the diaphragm plate and the nozzle. A method of automatically adjusting the relationship between the combustion amount and the nozzle position in a gun-type burner configured to control the combustion amount by changing the amount of fuel passing through the nozzle. It moves to the first nozzle position L ₁₀ corresponding to the first reference combustion amount P ₁ , and then the first reference combustion amount P ₁
On the other hand, the nozzle position is corrected so that the actual combustion amount falls within a certain error range, and then the nozzle is moved to the second nozzle position L ₂₀ corresponding to the second reference combustion amount P ₂ by the current calculation formula.
The nozzle position is corrected so that the actual combustion amount with respect to the second reference combustion amount P ₂ falls within a certain error range, and then the first reference combustion amount P ₁ and The combustion amount change K ₁ with respect to the unit movement amount of the nozzle is calculated from the reference combustion amount P ₂ of No. ₂ , the corrected first nozzle position L ₁₁ and the corrected second nozzle position L _21, and the obtained correction is obtained. It is characterized in that the subsequent first nozzle position L ₁₁ and the combustion amount change K ₁ with respect to the unit movement amount of the nozzle are stored in an external memory.

[0006]

When the adjustment switch of the remote controller or the controller is turned on, the adjustment is automatically performed according to a certain program. The first nozzle position L ₁₁ obtained by the adjustment and the combustion amount change K _{1 with} respect to the unit movement amount of the nozzle
Is effectively used for nozzle position calculation until the next adjustment is made. That is, when the required combustion amount is P, the nozzle position L is calculated by the following equation (1). L = L ₁₁ + (P−P ₁ ) / K ₁ Equation (1) Variation of nozzles by adjusting the first nozzle position L ₁₁ and the combustion amount change K ₁ with respect to the unit movement amount of the nozzle. The nozzle position-spray combustion amount can be controlled accurately and efficiently even if there is backlash / backlash in the drive system, fuel variation, or the like. Further, the nozzle position-spray combustion amount can be controlled accurately and efficiently even after repairing or replacing parts such as maintenance. Of course, the adjustment is automatic, so it's easy anytime, anywhere.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a gun type burner in which the method of the present invention is implemented, FIG. 2 is a schematic configuration diagram showing an example of a water heater using the gun type burner, and FIG. FIG. 4 is a control block diagram by the controller, FIG. 4 is a diagram showing a relationship between nozzle position and spray combustion amount, and FIG. 5 is a flowchart of an adjustment program automatically performed by the controller. In FIG. 2, 10 is a burner section having a gun type nozzle for spraying fuel, which will be described later, and also serves as a blower. 21 is a heat exchanger, a finned pipe for heat exchange
Equipped with 22. A water inlet pipe 23 is connected to one end of the pipe 22, and a hot water outlet pipe 24 is connected to the other end of the pipe 22. A flow rate detector 25 and a water temperature detector 26 consisting of a thermistor are provided in the water inlet pipe 23, and the hot water outlet pipe 24
A hot water temperature detector 27 consisting of a thermistor and a flow rate adjusting valve 28 are interposed in this. 30 is a control unit with a built-in microcomputer,
The flow rate detector 25 and the water temperature detector 26 are provided at the input ends of the control unit 30.
Is connected to the hot water temperature detector 27, and the output end of the control unit 30 is connected to the burner unit 10 and the flow rate adjusting valve 28. Control unit 30
A remote controller (hereinafter referred to as a remote controller) 40 is connected to.

As shown in FIG. 1, the fuel injection nozzle 11 provided in the burner portion 10 can be moved forward and backward by a drive means including a drive gear 12 and a drive motor 13 such as a stepping motor. The amount of spray cut by the spray diaphragm 14 changes depending on the position. That is, the advancing position of the nozzle 11 adjusts the fuel spray supply amount actually used for combustion, whereby the combustion heat amount is adjusted and the output number corresponds to the hot water supply condition set by the remote controller 40. 15 is a combustion tube, 16
Is an igniter, 17 is an oil pump, and 18 is a constant oil level. The hot water supply capacity of a water heater is expressed by the output number, and the output number 1 is the ability to raise 1 liter by 25 ° C per minute. Further, in the present embodiment, the combustion heat quantity is expressed by the number of hot water discharged.

In FIG. 3, a controller 30 includes an input circuit for each sensor such as a flow rate detector 25, a water temperature detector 26, a hot water temperature detector 27, a flow rate adjusting valve 28, a drive motor 13, and an igniter 1.
6. An output circuit to the oil pump 17, etc., a central processing unit (hereinafter referred to as CPU) 31 for performing sequence and process control and adjustment (correction) control, and an external memory 32 such as EEPROM for storing adjustment data. Have. The remote controller 40 is provided with an operation switch, a hot water discharge capacity setting switch, a display section showing each state of the water heater, an automatic adjustment switch, and the like. The automatic adjustment switch may be provided on the controller 30 side.

In normal use, when the hot water outlet (not shown) is opened and the hot water temperature is set by the remote controller 40,
The required output number P is calculated by the control unit 30 from the amount of incoming water detected by the flow rate detector 25, the water temperature detected by the water temperature detector 26, and the set hot water supply temperature, and the calculated output number P is calculated. The corresponding advance position L of the nozzle 11 is calculated by the calculation formula obtained by the adjustment, and the calculated value is sent to the driving means 12 and 13, and the nozzle 11 is advanced to a predetermined position. That is, feedforward control is performed. Further, the hot water temperature detector 27 detects the hot water temperature, and the control amount proportional to the difference from the set temperature is fed back from the control unit 30 to the fuel spray nozzle 11 via the driving means 12 and 13. In the feed-forward control, the correspondence between the output number and the fuel spray nozzle position must be accurate to some extent in advance, but it must be assembled in such a way that the exact correspondence can be reproduced when producing the water heater. Is difficult to do.
In addition, it is inevitable that there will be variations in individual water heaters. So until the water heater is manufactured and shipped,
Alternatively, after the hot water heater is repaired, or at regular intervals, or whenever necessary, adjustment is performed to make the relationship between the burner nozzle position and the spray combustion amount accurate. Next, the adjustment method will be described.

The adjustment is started when the adjuster fully opens the hot water outlet and the adjustment switch of the remote controller 40 is turned on with reference to FIGS. 4 and 5 (step 51). When the adjustment switch is turned on, the controller 30 will
Instruct 40 to blink the operation lamp indicating that adjustment is in progress (step
52) Then, the drive motor 13 is returned to the origin L ₀ (step 53). The origin position can be set with a limit switch. Then, the controller 30 uses the first reference combustion amount (output number) P ₁ , for example, No. 3, to obtain a predetermined tap water temperature T _S.
The calculated amount of water Q ₁ needed to get from the incoming water temperature T _C,
The flow rate control valve 28 is controlled to the water amount Q ₁ (step 54) and further moved to the first nozzle position L ₁₀ based on the current adjustment value (step 55). Then starts burning (step 56), monitoring the difference ΔT between the predetermined tapping temperature T _S of the the water temperature T _H has predetermined from hot water temperature detector 27 (Step 57)
, If the difference ΔT is not within the constant value γ (steps 58, 60), ΔL at a time to move within the constant value γ.
The nozzle 11 is corrected and moved one by one (steps 59 and 61), and steps 57 to 59 are repeated. Then, when the number of corrections N exceeds a certain value n, an unadjustable display is displayed on the remote controller 40 (steps 62, 63, 74). If the difference ΔT is within the constant value γ in steps 58 and 60, the corrected first nozzle position L ₁₁
The value of is stored in the RAM of the CPU 31 for the time being.

If the nozzle position with respect to the first reference combustion amount P ₁ can be provisionally adjusted, then the second reference combustion amount (number of tap water)
Adjust the nozzle position at P ₂ , eg No. 24. The adjustment is performed according to step 64 by calculating a water amount Q ₂ required to obtain the outlet heated water temperature T _S from the inlet water temperature T _C with the reference combustion amount P ₂ and controlling the flow rate control valve 28 to the water amount Q ₂ (step 64 ),
Further, it is moved to the second nozzle position L ₂₀ based on the current adjustment value (step 65). And monitoring the difference ΔT between the predetermined tapping temperature T _S of the the water temperature T _H has predetermined from hot water temperature detector 27 (step 66). If the difference ΔT is not within a predetermined value [delta] (Step 67, 69), the nozzle 11 is corrected and moved by ΔL at a time in the direction of falling within the constant value δ (steps 68, 70), and the second nozzle position L ₂₁ at that time and the temporarily stored first nozzle From the position L ₁₁ and the first and second reference combustion amounts P ₁ and P ₂ , the change K ₁ of the combustion amount per unit movement amount of the nozzle is calculated by the following equation (2) (step 71).
, RAM. _{K 1 = (P 2 -P 1} ) / (L 21 -L 11) ... Equation (2)

Until the correction number M reaches the fixed number m (steps 72 and 73), steps 54 to 73 are repeated, and if the difference ΔT does not fall within the fixed value δ during that time, an unadjustable display is displayed. Issue (step 74).

On the other hand, when the difference ΔT falls within the fixed value δ in steps 67 and 69, L ₁₁ and K ₁ stored in the RAM at that time are stored again in the EEPROM of the external memory 32 (step 75). .. This completes the adjustment, and the controller 30 gives an end display to the remote controller 40 (step 76). The coordinator closes Karan and ends. After the adjustment is completed, it is preferable to back up by the battery or use an EEPROM or the like until the next adjustment is made. After completing the above initial adjustment method, external memory
When the combustion amount (output number) P is determined by L ₁₁ and K ₁ stored in 32, the nozzle position L is calculated by the equation (1).

It should be noted that, in step 74, a fixed number of corrections n
Even if the first nozzle position does not fall within the fixed range γ, or if the second nozzle position does not fall within the fixed range δ due to the fixed number of corrections m, an unadjustable display is displayed and the process ends. However, by doing so, it is possible to automatically detect a component error, a defective assembly, or the like. Further, since the adjustment result is stored in the external memory 32, if the adjustment is made before shipment, the on-site adjustment becomes unnecessary, and the readjustment is not necessary even in the case of a power failure.

[0016]

According to the present invention, which has the above-mentioned structure,
According to the adjustment method described in, by turning on the adjustment switch, the relationship between the nozzle position and the combustion amount is automatically adjusted,
It can be controlled, and adjustments at the time of shipment and on-site installation can be easily performed anytime and anywhere. Nozzle variation during production, backlash backlash of drive system,
Even if there are variations in fuel, the nozzle position-spray combustion amount can be controlled accurately and efficiently without any problem. Further, the nozzle position-spray combustion amount can be controlled accurately and efficiently even after repairing or replacing parts such as maintenance. Of course, the adjustment is automatic, so it's easy anytime, anywhere.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gun-type burner in which the method of the present invention is implemented.

FIG. 2 is a schematic configuration diagram showing an example of a water heater using a gun type burner.

FIG. 3 is a control block diagram by a controller for implementing the present invention.

FIG. 4 is a diagram showing a relationship between nozzle position and spray combustion amount.

FIG. 5 is a flowchart of an adjustment program automatically executed by a controller.

[Explanation of symbols]

 11 Nozzles 12, 13 Driving means 14 Aperture plate 30 Controller 31 Microcomputer 32 External memory

Claims (1)

Claim: What is claimed is: 1. A spray throttle plate having a constant opening, a nozzle for spraying fuel, a drive means for moving the nozzle to change the distance from the throttle plate, and a drive means. In a gun-type burner configured to control the combustion amount by changing the distance between the throttle plate and the nozzle, and controlling the combustion amount. A method of automatically adjusting the relationship between the combustion amount and the nozzle position, wherein the nozzle is first moved to the first nozzle position L ₁₀ corresponding to the first reference combustion amount P ₁ according to the current arithmetic expression, Next, the nozzle position is corrected so that the actual combustion amount with respect to the first reference combustion amount P ₁ falls within a certain error range, and then the nozzle is moved to the second reference combustion amount P 1 according to the current calculation formula. equivalent to ₂ Go to the second nozzle position L _20, further corrects the nozzle position such that the actual combustion quantity to said second reference combustion rate P ₂ falls within a predetermined error range, then the first reference From the combustion amount P ₁ , the second reference combustion amount P ₂ , the corrected first nozzle position L ₁₁ and the corrected second nozzle position L ₂₁ , the change in combustion amount K ₁ with respect to the unit movement amount of the nozzle is calculated. The gun type burner adjusting method is characterized in that the corrected first nozzle position L ₁₁ and the combustion amount change K ₁ with respect to the nozzle unit movement amount are stored in an external memory.