JP2000111038A - Ignition controller for petroleum water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of a combustion sound at the time of igniting a petroleum water heater using a pressure spraying burner, an incomplete combustion gas or smoke. SOLUTION: A fuel pressurized by an electromagnetic pump 1 is discharged in a foggy state from a spraying nozzle, a blower 2 for supplying an air amount corresponding to the sprayed fuel is provided and a soft igntion type pressure spraying burner for igniting sprayed fuel at the time of a small flow rate not to a specified fuel and air amounts by a discharging spark of a discharging igniter 3 is constituted. A pattern memory means 6 selects a plurality of control patterns of an air supply control means 4 and a phase control means 5, stores them. An ignition state detecting means 7 for detecting an operating state of the soft igniter is provided. A comparison checking means 8 compares an output of the means 7 at the time of igniting of the previous time with that of this time, and allows a control pattern during using or alters a control pattern of next time ignition based on the data stored in the means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device capable of igniting while minimizing the combustion noise at the time of ignition and the generation of incomplete combustion gas and smoke in an operating state of an oil hot water heater.

[0002]

2. Description of the Related Art A pressure spray burner used as a heat source of an oil hot water heater sends a predetermined amount of air blown by a blower, a specified fuel flow rate pressurized by an electromagnetic pump and blown out from a spray nozzle to the burner, and discharges the gas. Since ignition and combustion occur instantaneously with sparks generated from the electrodes, at the time of ignition, sound and vibration close to explosion sound are generated, and odors and smoke associated with incomplete combustion are generated.

For this reason, the electromagnetic pump controls the air flow rate and the fuel flow rate so that the burner at the time of ignition can be completely burned, with the main purpose of gradually increasing the discharge pressure (flow rate) by phase control, and causes ignition. Low fuel flow, then 1
There is a proposal of a soft ignition device for increasing the output to 00%.
(See No. 59-13480)

[0004]

In an oil water heater using a pressure spray burner, reducing noise and vibration at the time of ignition involves igniting at a small fuel flow rate, and thereafter gradually increasing the amount of combustion. In order to reduce odor and smoke at the time of ignition, it is necessary to control and supply the amount of air so that the increased fuel flow can be completely burned.

However, since the water heater is a facility appliance, even if the sound and vibration at the time of ignition are set to a minimum by only the structure of the appliance main body, the installation condition of the water supply / hot water supply pipe and the exhaust pipe to be connected. In some cases, an abnormally loud noise may be generated with resonance depending on conditions such as the installation location, or the internal pressure of the combustion chamber may be increased due to the exhaust pipe structure, thereby deteriorating the combustion state.
For this reason, when installing a water heater that should have been quiet, an abnormal combustion noise or strong vibration combustion may occur and it may cause a complaint. Much higher than it had to be used with patience.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an electromagnetic pump 1 having a function of varying the flow rate of discharged fuel spray, and a blower capable of supplying an air amount corresponding to the variable fuel flow rate. 2 and a discharge igniter 3 that ignites the spray fuel by a spark that discharges. The discharge igniter 3 that operates by the ignition operation ignites when the flow rate of the spray fuel is smaller than the specified fuel flow rate, and discharges the spray fuel after ignition. In a soft-ignition device for a water heater that increases to a specified fuel flow rate, a blower control means 4 that operates a blower 2 in conjunction with an ignition operation, and an electromagnetic pump 1 that gradually increases the fuel spray pressure to reach a specified fuel flow rate after the ignition operation. Ignition phase control means 5
A pattern storage means 6 for selecting and storing a plurality of control patterns of the blower control means 4 and the phase control means 5;
An ignition state detection means for detecting an operation state of the soft ignition device; and a comparison and examination means for comparing the output of the ignition state detection means at the time of the previous ignition with that of the previous ignition.
In the state in which the oil hot water heater is installed, by accepting the control pattern in use based on the result of the ignition state detecting means 7 or changing the control pattern based on the data stored in the pattern storing means 6. Operation that minimizes combustion noise and vibration was achieved.

The pattern storage means 6 is provided with a RAM 6a for writing the output data of the ignition state detection means 6 corresponding to the stored control pattern, and the comparison and examination means 8 is provided with a selection data storage means 9 for storing the examination results. The ignition operation is performed according to the control pattern based on the data stored in the selection data storage means 9 so that the operation sound automatically becomes quiet during the test hot water supply operation even if the combustion noise or vibration immediately after installation is large. Things.

[0008]

According to the present invention, the rising pattern of the discharge pressure of the electromagnetic pump 1 and the rise of the blower 2 from zero to the specified blow rate and the ignition point are set so that the combustion noise and vibration in the standard installation state become the quietest. In addition to the specific control pattern of how to set, the pattern storage means 6 stores a plurality of control patterns including the best control pattern when various installations are assumed, and the ignition state detection means 7 Based on the detected data, the control pattern is automatically selected to minimize the combustion noise and vibration in the actual installed state. It can realize a quiet driving that suits the needs.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment of a heater shown in the drawing. Reference numeral 1 denotes an electromagnetic pump for supplying fuel to a burner 10, and reference numeral 11 denotes a fuel pressurized by the electromagnetic pump 1 which is blown out in a mist. The spray nozzle 3 is a discharge ignition device whose tip is disposed in front of the spray nozzle 11, and 2 is a blower for supplying combustion air to the burner 10.

Reference numeral 4 denotes a blower control means for the blower 2, 5 denotes a phase control means of the electromagnetic pump 1 for controlling a flow rate of fuel supplied to the burner 10, 12 denotes a discharge ignition device 3, a blower control means 4, and a phase control. The burner controller 12 controls the means 5 and the like. The burner controller 12 is preferably operated by the blower control means 4 and the phase control means 5 so that the air and the fuel sent to the burner 10 maintain the optimum air-fuel ratio and complete combustion. It can be so.

Reference numeral 13 denotes a combustion chamber into which the flame of the burner 10 is blown, 14 denotes a heat exchange chamber following the combustion chamber 13, 15 denotes an exhaust pipe for discharging combustion exhaust gas passing through the heat exchange chamber 14, 16
Is a water chamber constituting a can body of a water heater covering the outside of the combustion chamber 13 and the heat exchange chamber 14, and the water chamber 16 is provided with a water supply pipe 16a and a hot water pipe 16b.

Reference numeral 17 denotes ignition means for instructing the burner controller 12 to start the oil hot water heater, 18 denotes fire extinguishing means for instructing the operation of the oil hot water heater to stop, and 19 denotes a water chamber 16 of the hot water heater.
When the water heater is started by the ignition means 17, the burner controller 12 starts the operation of the burner 10 while detecting the hot water temperature by the hot water temperature detection means 19. When the temperature detecting means 19 detects the set temperature, the operation of the burner 10 is stopped. As described above, since the inside of the water chamber 16 is heated to a constant temperature,
The water sent from the water supply pipe 16a becomes hot water and becomes hot water.
b.

In an oil water heater equipped with such a pressure spray burner, ignition can be performed even when a specified fuel / air flow rate is sent to the burner 10 during an ignition operation. However, if specified combustion is performed immediately after ignition, it is limited. The internal pressure of the combustion chamber 13 in the closed space becomes high immediately after ignition, and generates a combustion start sound and vibration called "dawn", as well as smoke and odor. As a countermeasure, the amount of fuel sent to the spray nozzle 11 by the phase control means 5 of the electromagnetic pump 1 and the blow control means 4 of the blower 2 is reduced immediately after the ignition operation, and an air amount capable of igniting even with this small fuel flow rate is obtained. By performing such control, a soft ignition device that ignites when the amount of combustion is small and suppresses a rise in the pressure of the combustion chamber 13 has been put to practical use.

However, since the water supply pipe 16a, the water supply pipe 16b, and the exhaust pipe 15 are attached to the petroleum water heater, they are integrated with these parts in the installation state, which is considerably different from the standard installation state in the laboratory. Is different. In particular, there is a problem of resonance due to the length of the pipe and the fixed structure, and the shape and length of the exhaust pipe 15 greatly affect the rise characteristic of the internal pressure of the combustion chamber 13. In some cases, the installation of the water heater was accompanied by incredible loud combustion noise and vibration.

In the present invention which aims to reduce noise in the installed state, reference numeral 6 denotes a pattern storage means for storing a plurality of control patterns by patterning the control state of the blower control means 4 and the control state of the phase control means 5; Is ignition state detection means composed of a pressure sensor attached in communication with the combustion chamber 13 and a microphone incorporated in a control board such as the burner controller 12, and 8 is output data of the ignition state detection means 7 based on the previous control pattern. The comparison and examination unit 9 compares the output data of the ignition state detection unit 7 with the different control patterns this time, and 9 is a selection data storage unit that stores the examination result of the comparison and examination unit 8.

If the ignition state detecting means 7 is a microphone incorporated in the control board as in the above embodiment, the wiring is unnecessary and advantageous, but there is a possibility that malfunction may occur due to picking up external noise. is there. In order to detect the ignition state more accurately, there is a method of detecting an increase in the internal pressure of the combustion chamber 13 with a pressure sensor, and extends outward from an opening for mounting a pressure spray burner as in the embodiment of FIG. A pressure sensor may be attached to the attachment cylinder 13a, and this may be used as the ignition state detection means 7. Since unstable ignition involves large vibrations, a vibration sensor may be attached to the can of the oil heater and this sensor may be used as the ignition state detecting means 7.

The burner controller 12 shown in the embodiment of FIG. 1 performs an ignition operation according to the control pattern stored in the selection data storage means 9, and is optimal in a laboratory test at the beginning of the first use. The stored control pattern is stored. A RAM 6 which is attached to the pattern storage means 6 and stores output data of the ignition state detection means 7;
The output data of the ignition state detecting means 7 when the ignition is performed in a certain control pattern is stored in the RAM 6a.

The specific operation of the embodiment is as follows. At the time of the first ignition, the ignition is performed according to the standard control pattern set in advance in the selected data storage means 9, and the comparison and examination means 8 outputs the output data of the ignition detection means 7. Is read, and the control pattern is read from the selected data storage means 9.
Since there is no data written in M6a and cannot be compared, a control pattern similar to the control pattern at this time is read from the pattern storage means 6 and written into the selected data storage means 9, and the output data of the ignition state detection means 7 is read out. The corresponding control pattern is written in the RAM 6a.

At the time of the second ignition, the ignition is performed in accordance with the rewritten control pattern of the selected data storage means 9, the comparison and examination means 8 reads the output data of the ignition detection means 7, and further reads the control pattern from the selected data storage means 9. , RAM 6a
Of the previous data written in the memory and the current ignition state detecting means 7
And the control pattern changed in an advantageous direction is read from the pattern storage means 6 and written into the selected data storage means 9, and the output data of the ignition state detection means 7 is compared with the corresponding control pattern. It is written in the RAM 6a.

The ignition after the third time is performed according to the control pattern written in the selected data storage means 9.
The comparison / examination means 8 reads the output data of the ignition detection means 7, further reads the control pattern from the selected data storage means 9, and outputs two or more data written in the RAM 6a and the output data of the current ignition state detection means 7. Compare the RAM
If there is a minimum level in 6a, the control pattern corresponding to this data is read from the pattern storage means 6 and written in the selected data storage means 9. If the lowest level cannot be found between the data and the data written in the RAM 6a, the control pattern changed in an advantageous direction is read from the pattern storage means 6 and written into the selected data storage means 9, and the ignition state is detected. The output data of the means 7 is written in the RAM 6a of the corresponding control pattern.

While repeating such an ignition operation, RA
The output data of the ignition state detection means 7 in the installed state of the oil hot water heater is stored in M6a, and the control pattern being used is always at the lowest level, and the ignition is stabilized by accepting this control pattern. .

In the embodiment of the present invention, the pattern storage means 6 is provided with a RAM 6a corresponding to each control pattern, and the selection data storage means 9 is provided so that the burner controller 12 performs an ignition operation based on this data. However, as another embodiment, if the form of the control pattern stored is, for example, the control of the blower 2 is the same control, and only the control of the phase control means 5 of the electromagnetic pump 1 is changed little by little, the result of the comparison and the like is considered. The purpose can be attained only by providing a simple RAM or latch circuit holding the data in the comparison / examination means 9.

That is, the burner controller 12 reads a control pattern from the pattern storage means 6 based on the latched data of the comparison and examination means 8 and performs an ignition operation, and the comparison and examination means 8 outputs a previous control pattern different from the present one. The data is compared with the current output data of the ignition detection means 7, and if it is within a certain range, the current control pattern is accepted. If the difference is large, the control pattern changed by one step is latched as the next ignition data. The oil water heater can be operated quietly during a plurality of ignition operations.

[0024]

As described above, according to the present invention, a control pattern for minimizing the generation of combustion noise, vibration and incomplete combustion gas in a standard installation state in a laboratory or the like, as in a conventional oil water heater, is specified. Without storing, a plurality of control patterns are stored, and based on the output data of the ignition state detecting means 7, an optimum control pattern in a state where the oil hot water heater is installed is selected. By performing the ignition operation described above, variations due to installation work are eliminated, and quiet ignition can be realized.

Further, as a control pattern, the blower control means 4 for controlling the blower 2 does not perform a special phase control only by the energization timing but always uses the control pattern of the phase control means 5 of the electromagnetic pump 1 as the same control pattern. In the case of having a plurality of pieces by changing, the comparison and examination means 8 of the present invention
May be simple. However, the blowing control means 4
When preparing a plurality of control patterns in which the air blowing timing and the operation of the phase control means 5 of the electromagnetic pump 1 are combined in a complicated manner, the operation of the comparison and examination means 8 requires considerable complexity.

In the present invention, a RAM 6a corresponding to the control pattern stored in the pattern storage means 6 is provided.
The output data of the ignition state detection means 6 is written in M6a to be used as data for comparison and examination, and a selection data storage means 9 for writing the result of comparison and examination is provided. The ignition is written in this selection data storage means 9. Since the decision is made based on the data, it is possible to respond to complicated control patterns and to select fine control patterns, and to achieve an excellent effect of reducing noise when the oil heater is ignited. Was.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an oil water heater according to an embodiment of the present invention.

FIG. 2 is a sectional view of an oil hot water heater showing an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electromagnetic pump 2 blower 3 discharge ignition device 4 blower control means 5 phase control means 6 pattern storage means 6a RAM 7 ignition state detection means 8 comparison and study means 9 selection data storage means

Claims (2)

[Claims] 1. An electromagnetic pump 1 having a function of varying a flow rate of a discharged fuel spray, a blower 2 capable of supplying an air amount corresponding to the variable fuel flow rate, and a discharge igniter for igniting the spray fuel by a spark to be discharged. A discharge igniter 3 operated by an ignition operation, ignites when the sprayed fuel flow rate is less than a specified fuel flow rate, and increases the sprayed fuel to the specified fuel flow rate after ignition. Blower control means 4 for operating blower 2 in conjunction with operation
After the ignition operation, a plurality of control patterns of the ignition phase control means 5, the blow control means 4 and the phase control means 5 of the electromagnetic pump 1 which gradually increases the fuel spray pressure to reach the specified fuel flow rate are selected and Pattern storage means 6 for storing the ignition state, and ignition state detection means 7 for detecting the operation state of the soft ignition device, and comparison and examination means 8 for comparing the output of the ignition state detection means 7 at the time of the previous ignition with that of the current ignition. The comparison and examination means 8 accepts a control pattern in use based on the result of the ignition state detection means 7 or changes the control pattern based on data stored in the pattern storage means 6. Machine ignition control device. 2. The pattern storage means 6 is provided with a RAM 6a for writing the output data of the ignition state detection means 6 corresponding to the stored control pattern, and the comparison and examination means 8 is provided with a selection data storage means 9 for storing the examination results. 2. The ignition control device for an oil water heater according to claim 1, wherein the ignition operation is performed by a control pattern based on data stored in the selection data storage means.