JPH06159665A - Control device for gun type burner - Google Patents

Abstract

PURPOSE:To provide a control device for a gun type burner in which a degree of non-alignment of engaging at a nozzle driving part for a gun type burner is detected, a movement of the nozzle is corrected in response to the degree and the movement of the nozzle can be properly carried out. CONSTITUTION:As a power source rising sensing means 51 detects a rising of a power source, a hysteresis number sensing means 52 detects a degree of non-alignment of a nozzle driving part in reference to the number of steps of a stepping motor in advance. Then, when the nozzle is to be driven, a hysteresis accommodation discriminating means 53 judges whether or not a hysteresis is required and if needed, the step number correcting means 54 corrects the number of driving steps of the nozzle in response to the number of hysteresis and the driving control means 55 moves the nozzle 11 through the stepping motor 12 in reference to the corrected number of steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a gun type burner in a hot water supply device or the like.

[0002]

2. Description of the Related Art A conventional gun type burner drives a shield plate having holes, a nozzle for injecting fuel, a stepping motor for moving the nozzle to change the distance from the shield plate, and a stepping motor. A control device is provided, and the combustion heat amount is controlled by changing the distance between the shield plate and the nozzle to change the amount of fuel passing through the holes of the shield plate.

[0003]

However, in such a conventional device, there is a transmission means 14 as shown in FIG. 2 when the nozzle is advanced and retracted by the stepping motor, which is engaged with a screw thread to form the nozzle. Since the nozzle is moved forward and backward by rotating the nozzle, the position of the nozzle cannot be properly controlled corresponding to the number of steps of the stepping motor unless the engagement state between the nozzle and the screw thread is perfect.

If there is a large manufacturing variation in the nozzle driving unit during manufacturing, or if there is deterioration of the nozzle driving unit due to deterioration over time due to use, the engagement state will become unsatisfactory and the number of steps of the stepping motor will change the nozzle. There was a problem that the position of could not be controlled properly.

Therefore, the present invention has been made in view of such a problem, and detects the irregularity of the nozzle drive section by the number of steps of the stepping motor, and based on this value, the number of steps of the stepping motor. The present invention relates to a gun type burner control device capable of appropriately controlling the nozzle position even when there is a malfunction.

[0006]

The invention according to claim 1 is
A shield plate having holes, a nozzle for injecting fuel, and a stepping motor for moving the nozzle to change the distance between the shield plate and the shield plate, and changing the distance between the shield plate and the nozzle In the control device of the gun type burner for controlling the combustion heat quantity by changing the amount of fuel passing through the hole, the stepping motor step number corresponds to the hysteresis due to the deviation generated when the moving direction of the nozzle is changed. When the hysteresis number detection means for detecting the number of hysteresis steps, the hysteresis suitability determination means for determining whether or not the nozzle drive is affected by the hysteresis, and the hysteresis suitability determination means are determined to be affected by the hysteresis. Corrects the number of nozzle drive steps based on the number of hysteresis steps When the step number correcting means and the hysteresis suitability determining means determine that they are affected by the hysteresis, the stepping motor is driven based on the step number corrected by the step number correcting means, and the hysteresis suitability determining means. When it is determined that is not affected by hysteresis, there is provided drive control means for driving the stepping motor without correcting the number of drive steps by the step number correction means.

[0007]

According to the present invention, when the power is turned on, the hysteresis number detecting means detects the degree of malfunction of the drive unit of the burner as the number of steps of the stepping motor before the control of driving the burner. Then, when moving the burner forward and backward, especially when reversing the direction when the burner moves in the forward direction and when the burner moves in the backward direction, a deviation in the number of steps due to this irregularity occurs. From the information on the moving direction, the hysteresis suitability determination unit determines whether or not the hysteresis step number correction is necessary by the step number correction unit, and if necessary, the step number correction unit sets the hysteresis step number to drive the stepping motor. The stepping motor is corrected by the number of steps, and the stepping motor is driven by the driving unit by the corrected number of steps.

[0008]

Embodiments of the present invention will be described with reference to the drawings.
1 is a schematic overall configuration diagram of a hot water supply apparatus embodying the present invention, and FIG. 2 is a schematic configuration diagram of a gun type burner portion. Figure 1,
An outline of a gun type burner and a hot water supply apparatus using the same will be described with reference to FIG.

First, as shown in FIG. 1, the gun-type burner 10 includes a fuel spray nozzle 11 and a blower fan 5. Further, the heat exchanger 21 includes a finned pipe 22 for heat exchange. 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. The water flow pipe 23 has a flow rate detector 2
5 and a water temperature detector 26 including a thermistor are mounted, and a hot water temperature detector 27 including a thermistor and a flow rate adjusting valve 28 are attached to the hot water outlet pipe 24. Members 21-2
Reference numeral 8 forms a hot water supply unit 20. The control device 30 has a built-in microcomputer, and the output ends of the flow rate detector 25, the water temperature detector 26, and the hot water temperature detector 27 are connected to the input end, and the output end of the control device 30 is a gun type. It is connected to each input end of the burner 10 and the flow rate adjusting valve 28. A remote controller 40 is connected to the control device 30.

Next, as shown in FIG. 2, the fuel spray nozzle 11 provided in the gun type burner 10 is transmitted by a stepping motor 12 for moving the nozzle to a transmission means 14.
A detection sensor 58 is provided so as to be able to move back and forth through the, and to detect the most retracted position. The amount of spray cut by the shield plate 13 having a hole changes depending on the advance / retreat position. That is, the amount of fuel spray supplied for combustion is adjusted by the advancing / retreating position of the fuel spray nozzle 11, whereby the amount of heat of combustion is adjusted, and the hot water supply conditions set by the remote controller 40 are realized.

Next, the structure of the present invention will be described. FIG. 3 is a block diagram thereof.

The controller 30 is a remote controller 4
The control device 30 operates based on a command on the 0 side to move the nozzle 11 forward and backward through the stepping motor 12, and at this time, the detection sensor 58 detects when the nozzle comes to the most retracted position and causes the control unit 50 to detect it. Send a detection signal.

The control device 30 includes a control unit 50 and a storage unit 57.
have. The control unit 50 uses the power supply activation detection means 5
1, hysteresis number detection means 52, hysteresis appropriateness determination means 53, step number correction means 54, drive control means 5
5 and other control means 56.

The power supply start-up detecting means 51 is means for detecting that the power supply switch of the water heater is turned on. The hysteresis number detecting means 52 is the stepping motor 12
And means for detecting the degree of disengagement of engagement due to deterioration of the transmission means 14 of the nozzle 11 and assembly error.

Specifically, referring to FIG. 4, the A position and the D position are the most retracted positions where the nozzle is most retracted, and the B position and the C position are the most advanced positions where the nozzle is most advanced. If the degree of engagement failure of the transmission means 14 is large when the advancing / retreating direction of the nozzle is reversed, the stepping motor 1
Although 2 rotates, there is a region where the nozzle 11 does not move forward or backward. In FIG. 4, B → C, E → F, and D → A are areas where the stepping motor rotates but the nozzle does not move when the advancing / retreating direction is reversed. This region is determined by the degree of improper engagement of the transmission means 14, and the step number of the stepping motor (hereinafter referred to as the hysteresis step number) when the stepping motor 12 rotates but the nozzle does not move is substantially constant.

The hysteresis appropriateness determining means 53 is means for determining whether or not the number of hysteresis steps needs to be taken into consideration when moving the nozzle, and is accompanied by reversal of the moving direction at the time of movement, or the previous movement. It is determined that it is necessary to consider the number of hysteresis steps when the moving direction and the moving direction this time are different. Step number correction means 54
Is a means for correcting the driving step number of the stepping motor 12 based on the hysteresis number detected by the hysteresis number detecting means 52 when the hysteresis suitability determining means 53 determines that it is necessary to consider the hysteresis. The other control means 56 performs control other than the above, and controls data transmission with the remote controller 40 and data exchange with the storage unit 57.

The storage unit 57 stores the number of hysteresis steps detected by the hysteresis number detecting means, other data, and the control procedure of the control operation.

Next, the operation of detecting the number of hysteresis steps by the hysteresis number detecting means 52 will be described. FIG. 5 is a flowchart showing the operation. First, the power supply start-up detection means 51 detects whether or not the power supply is turned on, and if detected, the operation of detecting the number of hysteresis steps is started (S1). First, the nozzle is moved in the retreating direction, in FIG. 2, to the right (S2), and is moved until the detection sensor 58 is turned on (S3). When the detection sensor 58 is turned on, the movement of the nozzle is temporarily stopped (S4), the hysteresis step number HS is cleared, and HS = O is set (S5). The position of the nozzle at this time is the position D in FIG. Then, the number of steps of the stepping motor is counted (HS =
It is moved while (HS + 1) (S6). When the detection sensor 58 is turned off (S7), the movement of the nozzle is stopped (S8), and the value of HS at that time is determined as the number of hysteresis steps (S9). The stop position at this time is the position A in FIG.

Next, the operation during the normal operation after the hysteresis step number is detected by the hysteresis number detecting means 52 will be described with reference to FIG.

First, the hysteresis appropriateness determining means 53 determines whether the drive direction of the burner is the same as the direction when the burner was previously moved or stopped, or the opposite direction (S1).
1). If it is in the opposite direction (S12), since it is affected by the degree of improper engagement of the transmission means 14, the step number correction means 54 performs correction by adding the hysteresis step number to the nozzle drive step number (S13). If the moving direction of the nozzle matches the previous direction, it is not necessary to perform correction (S12). When the correction by the step number correction means 54 is completed, the drive control means 55 drives the stepping motor 12 by the number of drive steps, and the nozzle 11
Is moved (S14). When the movement is completed, it is judged whether or not the movement is required most (S15). If the movement of the burner is not completed and the movement is required again, the operations from steps S11 to S15 are performed. repeat. When the burner operation is completed (S15), the operation is moved to the fixed position A in FIG. 4 and stopped.

The nozzle is moved in the backward direction, to the right in FIG. 2 (S16), until the detection sensor 58 is turned on. When the detection sensor 58 is turned on (S17), this time the nozzle is moved in the advancing direction, and in FIG. 4 is moved to the left (S1).
8) If the detection sensor 58 is turned off (S19), the movement of the nozzle is stopped (S20). This stop position is the position A in FIG. 4, and prepares for the next operation. With that, a series of operations for driving the burner is completed.

In the above-described embodiment, the power source activation detecting means 51 is provided in the control section 50 on the burner side, but it may be provided on the remote controller side. Further, it goes without saying that the operation of detecting the number of hysteresis steps may be performed at a timing other than when the power is turned on. For example, it may be performed after the end of the post-purge for blowing air after the end of combustion. In this case, the number of steps issued to the stepping motor 12 to move the nozzle to the left in step S18 is between the detection in step S17 of FIG. 6 and the detection sensor 58 being turned off in step S19. It is the number of hysteresis steps. Even in such a case, if the number of hysteresis steps is calculated, it is possible to check several times per day.

In the above embodiment, the hysteresis step number is detected by one operation of the hysteresis number detecting means 52, but the hysteresis step number detecting operation is performed a plurality of times when the power is turned on and the like. The average value may be used as the number of hysteresis steps. In this case, a more reliable number of hysteresis steps can be obtained, and reliable correction can be performed.

Further, in the above embodiment, the correction is made by the number of hysteresis steps detected by the hysteresis number detecting means 52. However, when the number of steps to be corrected is small, the correction is not carried out, and it is confirmed that the number of steps becomes a predetermined number or more. The number of steps may be corrected by the number-of-steps correction unit 54 depending on the condition.

The step number correcting means 54 does not always correct the step number, but when the hysteresis number detecting means 52 detects the hysteresis step number, it is judged whether or not the hysteresis step number is a predetermined value or more. If it is equal to or more than the predetermined value, the number of times of operation of the hysteresis number detecting means 52 when it is equal to or more than the predetermined value is cumulatively counted, and the step correcting means 54 may be operated after the cumulative count becomes equal to or more than the predetermined value. good.

Further, in the above embodiment, if the number of hysteresis steps detected by the hysteresis number detecting means 52 is a predetermined number or more, maintenance / inspection may be displayed to prompt the necessity of maintenance / inspection.

Further, in the above embodiment, the detection of the number of hysteresis steps is detected in the area D → A in FIG.
Even if it is detected in different areas B → C and E → F, A → B →
Of course, all the loops may be obtained and detected as in C → D → A.

[0028]

As described above, according to the present invention, the degree of malfunction of the portion that drives the nozzle is detected, and the deviation amount of the movement of the nozzle caused by the malfunction is appropriately corrected by the number of steps of the stepping motor. Since it can be performed, there is an effect that the nozzle can be surely moved to an appropriate position even when there is a malfunction.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hot water supply device embodying the present invention.

FIG. 2 is a configuration diagram of a gun type burner portion.

FIG. 3 is a block diagram of the present invention.

FIG. 4 is a diagram showing a hysteresis characteristic due to movement of a nozzle.

FIG. 5 is an operation flowchart for detecting the number of hysteresis steps.

FIG. 6 is an operation flowchart of driving a nozzle.

[Explanation of symbols]

 10 Gun Type Burner 11 Nozzle 12 Stepping Motor 14 Transmission Means 30 Controller 50 Control Unit 52 Hysteresis Number Detection Means 53 Hysteresis Appropriateness Discrimination Means 54 Step Number Correction Means 55 Drive Control Means 57 Storage Unit 58 Detection Sensors

Claims (1)

[Claims] 1. A shield plate having a hole, a nozzle for injecting fuel, and a stepping motor for moving the nozzle to change the distance from the shield plate, the distance between the shield plate and the nozzle being set. In a controller of a gun-type burner that controls the amount of combustion heat by changing the amount of fuel that passes through the holes of the shield plate, a stepping motor that responds to hysteresis caused by a deviation that occurs when the moving direction of the nozzle is changed. Hysteresis number detecting means for detecting the number of hysteresis steps, which is the number of steps, a hysteresis suitability determining means for determining whether or not the nozzle drive is affected by the hysteresis, and the hysteresis suitability determining means is affected by the hysteresis. If it is determined that the nozzle driving step number is the hysteresis step number When it is determined that the step number correction means for correcting based on the hysteresis and the hysteresis appropriateness determination means are influenced by the hysteresis, the stepping motor is driven based on the step number corrected by the step number correction means, and the hysteresis Gun type characterized by comprising drive control means for driving the stepping motor without correcting the number of drive steps by the step number correction means when the suitability determination means determines that it is not affected by hysteresis. Burner control device.