JPH0735346A - Operation control device in combustion equipment - Google Patents

Abstract

PURPOSE:To improve convenience in use of a device against a power failure by a method wherein a content of trouble and an operating state are continued to be stored in a memory even if a power source is shut off. CONSTITUTION:As an operation is instructed, an operating state at a combustion control part 6 is monitored at an operation state sensing part 12 and a result of monitoring operation is written into an operating state memory means 13 and stored in it. When a trouble sensing part 10 detects a trouble during usage of the combustion equipment, this state is transferred to the combustion control part 6, thereby combustion is stopped and concurrently the detected content is informed by the trouble displaying means 11, the content off trouble is written into the operating state memory means 13 and stored in it. Then, after the power source to be supplied to the combustion equipment is shut off due to its power failure, its re-turning on causes the state at the time of power failure is discriminated and if the troubled stop occurs, the content of trouble is displayed and the operation is stopped, or if it is in its normal stopped condition, the combustion is started through the restarting of operation and the operation is started again. Accordingly, it is not necessary to operate the operation again every time the power failure occurs and so its convenience in use can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a combustion device having a function of storing a failure condition.

[0002]

2. Description of the Related Art A conventional technique will be described by taking an oil fan heater as an example.

Generally, in this type of combustion equipment, as shown in FIG. 5, a burner 103, a fan 104 for warm air and its motor 10 are provided inside a space surrounded by an exterior 101 and a stand 102.
5. The controller 106 is provided to control the overall operation of the louver 1 by mixing the indoor air A with the combustion gas B by the motor 105 to generate warm air C having an appropriate temperature.
It is configured to be discharged from 07 and used for heating the room.

As shown in FIG. 6, the burner 103 includes a vaporization cylinder 108 for vaporizing combustion kerosene, an electromagnetic pump 109 for supplying a fixed amount of kerosene, and a burner motor 11 for feeding combustion air.
0, an ignition electrode 110 for igniting vaporized kerosene, a frame rod 112 for monitoring the state of the combustion flame D, and the like.

When an unsafe operation such as abnormal combustion or abnormal overheat occurs in such a combustion device, the combustion is quickly stopped, and after confirming and repairing the abnormal portion or the defective portion, the combustion is restarted by a manual operation. It is common to secure safety by

For example, in the case where an earthquake occurs during the operation of a heating device and causes an abnormal stop, the earthquake detector is often a self-recovery type, and abnormal information indicating that it is stopped due to the earthquake is retained in the microcomputer. It is only being done. Therefore, if the power input to the equipment is temporarily interrupted during an abnormal stop and the situation returns to the normal state again, the abnormal information held in the microcomputer is cleared and the operation switch Combustion will start again, relying only on information from.

In order to prevent such unsafe operation,
Conventionally, when the operation switch is a lock type, the switch is turned on and off, and when it is a non-lock type, a device such as a latching relay that stores and holds the operation instruction is provided, and the output state is detected to detect the operation on When the power to the device is turned on in this state, it is determined to be abnormal. Therefore, even if the abnormality information held in the microcomputer due to a power failure or the like is cleared, the combustion is not automatically restarted.

Conventionally, an overheat abnormality safety device, which operates when the temperature inside the combustion device abnormally rises for some reason, shuts off the power supply of the microcomputer and the load controlled by it, and the overheat abnormality safety device automatically operates. It is configured with a non-return type or a manual return type so that it will not return to.

[0009]

However, the first problem of the above-mentioned prior art is to stop the operation of the heating equipment when the power is restored if a power failure occurs during combustion even if it is normal. I will stay. Therefore, it is necessary to redo the driving operation each time there is a power outage, and there is a problem that usability becomes poor.

As a second problem, in the technology using the conventional non-reset type or manual reset type overheat abnormality safety device,
Once the overheat abnormality device is activated, it cannot be reused or it takes time to restore it. Therefore, a slight temperature change tends to set a higher temperature so that the overheat abnormality device does not operate. Therefore, when the overheat abnormality device operates, there are problems that the combustion control circuit including the microcomputer is likely to malfunction, or the cabinet of the device is easily thermally deformed, and the device has no safety margin.

As a third problem, if an overheat abnormality safety device of a low reset type is used to solve the second problem, the operation / return of the overheat abnormality safety device is repeated indefinitely and heat stress causes There is a problem that the life is shortened.

The present invention is intended to solve the above-mentioned problems.
The purpose of is to improve usability against power failure.

A second object is to further improve usability by enabling restarting without sacrificing safety even if the engine is stopped due to abnormal overheating.

The third purpose is to operate the overheat abnormality safety device /
The purpose is to limit the number of restorations and extend the life of the equipment.

[0015]

In order to achieve the above-mentioned first object, the present invention controls operation of combustion by instructing driving / stopping of combustion equipment and receiving instruction of this operation instructing means. A combustion control unit that operates, a failure detection unit that detects a failure of the combustion device, a failure condition detected by the failure detection unit, and an operation state of the combustion control unit that continues to be stored and stored even if the power is cut off. The storage means and the operation restart determination means for determining whether the combustion operation is restarted or stopped when the power is restored are provided and configured according to the contents of the operation status storage means. In order to achieve the above, in addition to the first target achievement means, the combustion control unit operates via an automatic recovery type overheat abnormality safety device that operates when the internal temperature of the equipment becomes abnormally high and automatically recovers when the temperature decreases. Connect to the power supply In order to achieve the third object, in addition to the second target achieving means, a counter for counting the number of times the combustion operation is restarted when the power source is restored is provided and the second target achieving means is provided. The contents of the counter are stored and held in the operating condition storage means, and the restart is considered in consideration of the stored contents.

[0016]

According to the first means for solving the above problems, the present invention provides:
Even if a power failure occurs while the combustion equipment is in operation, operation is stopped, or failure occurs, the status before the power failure, that is, the operation or failure status is stored in memory. If it is, the stopped state will be maintained even if the power is restored, but if the power is on and normal operation is in progress, restarting will be started when the power is restored. Therefore, it is not necessary to perform the driving operation again each time there is a power failure, and the usability is improved.

Further, according to the second means for solving the problem, by setting the operating temperature of the overheat abnormality safety device to be low, the operation is automatically restarted if the temperature of the equipment is increased and the temperature is lowered. Moreover, it is possible to prevent deformation of the device and malfunction of the microcomputer, and improve usability and safety.

Further, the third problem solving means prevents the abnormal overheat device from repeatedly operating indefinitely, so that the thermal stress can be reduced, the life can be improved, and the safety can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of an operation control device for a combustion device for explaining the present embodiment. 1 is an operation switch using a tact switch for instructing the operation of the device, and 5 is a control unit mainly composed of a microcomputer. 7 is a vaporization cylinder 108 and an electromagnetic pump 1
09, burner motor 110, ignition electrode 110, motor 1
A drive load group composed of 05, 8 is a self-recovery earthquake detecting means composed of a switch whose contacts are opened during the vibration of the earthquake, 9 is composed of a plurality of bimetal thermostats or thermistors, An abnormal overheat detection group that operates when the temperature of the warm air C or the inside of the device becomes abnormally high due to a decrease in the air volume of the indoor air A due to clogging or abnormal combustion,
Reference numeral 11 is a failure display means for informing the details of the failure.

Reference numeral 13 denotes an operating condition storage means capable of writing and reading, and writing and storing the operating condition of the control unit 5 and the detected contents of the failure at a proper time, and 14 is a power supply unit for supplying electric power to the device. It is connected to a commercial power supply 17 via an overheat abnormality safety device 18 composed of an automatic reset type thermoswitch that operates when the temperature rises abnormally and automatically returns when the temperature falls. Overheat abnormal safety device 18
Is a final safety device when the temperature is set higher than the temperature setting of the abnormal overheat detection group 9 and the abnormal overheat detection group 9 does not operate. Reference numeral 15 is a backup power supply for holding the contents stored in the operation status storage means 13 when the power supply of the power supply unit 14 is cut off.

As the configuration of the control unit 5, a flip-flop 3 for storing and holding the operation of the operation switch 1, and a drive instruction unit 4 for determining whether to operate or stop and outputting the result as a drive instruction signal. And a combustion control unit 6 for controlling combustion by driving the driving load group 7 in a predetermined order and starting and stopping combustion in response to a driving instruction signal from the driving instruction means 2. And a failure detection unit 10 for detecting an abnormal operation of the drive load group 7 and an abnormal combustion state represented by a misfire or a yellow fire, and a situation such as an operation of the earthquake detection means 8 or the abnormal overheat detection group 9.
Then, the contents of the operating condition storage unit 13 are read at the timing of the initial start of the operating condition detection unit 12 and the control unit 5 for detecting whether the combustion equipment is operating, normally stopped, or abnormally stopped. The operation restart determination means 16 determines whether to restart the operation or keep the operation stopped depending on the contents.

Further, the detection contents of the failure detection unit 10 and the operation state detection unit 12 are written in the operation status storage unit 13 at a proper time, and the contents thereof are held by the backup power supply 15. However, the backup power supply 15 fails or the power is consumed. When is completely discharged, the stored contents of the operating condition storage means 13 are cleared to initial values.

According to the contents read from the operation status storage means 13, the operation restart determination means 16 determines whether the operation status at the time of the power failure is "normal operation" or "normal stop" by turning off the operation switch. Whether the operation information discriminating unit 17 discriminates whether it is "abnormal stop", the fault information discriminating unit 18 which discriminates the fault information from the read contents, and the read contents are predetermined. And an abnormality determination unit 19 for discriminating that the content is not operating information or failure information and is not proper.

Next, the operation of the device configured as described above will be described. First, when the operation switch is pressed, the output of the flip-flop 3 is turned off if it is on, and is turned on if it is off, and its contents are reversed. At the same time, the operation instructing section 4 sends an operation start instruction to the combustion control section 6 if the output of the flip-flop 3 is on, and an operation stop instruction to the combustion control section 6 if the output of the flip-flop 3 is off.

When the operation is instructed, the combustion control section 6 starts preheating, prepurge and ignition operations, and shifts to ignition operation and steady combustion. The operating state of the combustion control unit 6 is monitored by the operating state detecting unit 12, and the monitoring result is written and stored in the operating state storage unit 13.

In addition, the failure detection unit 10 during the use of the combustion equipment
When it detects a failure, it informs the combustion control unit 6,
At the same time when the combustion is stopped, the detected content is notified by the failure display means 11, and the failure content is written and stored in the operating state storage means 13.

Next, the operation when the power supply from the power supply unit 14 is stopped will be described. When the power supply from the power supply unit 14 is stopped, the temperature inside the equipment abnormally rises and the contact point of the overheat abnormality safety device 18 opens, or when the failure occurs, the user may turn the power outlet on again or the power failure may occur. Occurrence is expected. In such a case, the contents of the control unit 5 are all cleared, but the contents stored in the operation status storage unit 13 are held by the backup power supply 15, and the contents stored in the operation status storage unit 13 can be read when the power is turned on again. It is possible to determine what the operating state was when the power failure occurred.

The operation during re-energization will be described below with reference to the flowchart of FIG. First, in step 50, it is the time when the control unit 5 is started after re-energization, and the information in the microcomputer is initialized. In step 51, the stored contents of the operating condition storage means 13 are read and stored in the operating condition area (not shown) at the time of power failure secured on the RAM of the microcomputer. In step 52, the operation information is extracted from the contents of the operation status area at the time of power failure, and it is judged whether or not the operation is on with the operation switch ON. If it is, the operation proceeds to step 53 to restart the operation. If not, it is determined that the "abnormal stop" or the "normal stop" of the operation switch is off, and the process proceeds to step 54a.

At step 54a, it is judged whether or not the failure information is included in the contents of the operation status area at the time of power failure. If there is the failure information, it is judged that "abnormal operation is in progress", and at step 55, according to the failure contents. If the failure information is not present, the process proceeds to step 56.

In step 56, it is further determined whether or not the contents of the operation status area at the time of power failure indicate the initial value of the operation status storage means 13, and if it indicates the initial value, the time that the backup power supply 15 can hold. When it is determined that the power outage has continued for a long time, the backup power supply abnormality process is performed in step 57. If it does not indicate the initial value of the operating condition storage means 13, the process proceeds to step 58, it is judged whether or not the stored contents are "normal stop" of the operation switch off, and if not "normal stop", step When it is judged that the stored contents of the operating condition storage means 13 read in 51 are irregular, the storage unit abnormality processing is performed in step 59. After the contents of the failure information and abnormality information processed in steps 55, 57 and 59 are displayed in step 60, the operation stop processing of step 61 is performed. If it is determined in step 58 that “normal stop is in progress”, the process directly proceeds to step 61 without performing step 60.

According to the configuration of the above embodiment, when the power supply to the combustion equipment is cut off due to a power failure or the like and then turned on again, the state at the time of the power failure is discriminated, and if the failure is stopped, the failure content is determined. The display is stopped, and if it is normally stopped, it is stopped, but if it is in normal operation, combustion is restarted by operation restart processing such as preheating, prepurge, ignition operation, and steady combustion. Therefore, even if a power failure occurs, if the equipment is normal, the re-combustion is automatically performed, which improves usability.

In the case of abnormal overheating even in the case of abnormal stop, if the temperature drops, it can be automatically restarted. In that case, safety can be secured by setting the operating temperature of the overheat abnormal safety device 18 to a low level. Therefore, it is possible to improve usability while maintaining safety.

However, with the above-described structure, the overheat abnormality safety device 18 is a final safety device and is subject to heat stress gradually when it is frequently operated, and the life of the combustion equipment is shortened.

In order to solve the above problems, a second embodiment is shown in FIGS. 3 and 4. 3 has the same configuration as that of FIG. 1, except that a counter 20 is newly provided, and in addition to the contents of the operation status detection unit 12 and the failure detection unit 10, the counter 20 of the operation status storage unit 12 is additionally provided. The contents should also be written and stored. The counter 20 counts up each time a signal for restarting driving is output from the driving information discriminating unit 17, and the count content thereof is the same as the detection contents of the failure detection unit 10 and the driving state detection unit 12 and the timely driving status memory is stored. Written and stored in the means 13. Further, when the value of the counter 20 reaches a predetermined number of times or more, it is output to the failure detection unit 10.

The operation of the device configured as in the second embodiment upon reenergization will be described with reference to the flow chart shown in FIG.
Although FIG. 4 has the same configuration as that of FIG. 2, step 62, step 63, step 64, and step 65 are newly added. In step 62, the value of the counter 20 written before the power failure is taken out from the contents of the operation status storage means 13 read in step 51, and the value is set in the counter 20, and in step 63, it is set in the counter 20. The value is compared with a predetermined value. For example, if it is less than "5", the process proceeds to step 64 and the value of the counter 20 is incremented by one. On the other hand, if the value of the counter 20 is, for example, "5" or more, it is determined that there is some abnormality because the number of stoppages is large, and step 65 is executed.

According to the configuration of the second embodiment described above, if the frequency of power outages during operation increases, it is assumed that this is due to abnormal overheating, and the operation is restarted even during operation during power outages. Without doing so, it will display a failure and stop, and it will not receive more heat stress than necessary.

The operating condition storage means 13 of this embodiment is used.
Holds the stored contents by the backup power supply 15, but the same effect can be obtained by using a non-volatile storage device capable of writing and reading a plurality of pieces of failure information, and the backup power supply 15 becomes unnecessary. There is also an advantage that

Further, although the operation switch of this embodiment is a non-locking type, even if the operation switch is a locking type, the effect thereof is not impeded, and the non-locking type as shown in the embodiment of the present invention is used. The use of the operation switch also has the effect of eliminating the conventional means for storing and holding the operation instruction state such as a latching relay.

[0040]

As is apparent from the above embodiments, according to the present invention, even if a power failure occurs during the operation or failure stop of the combustion equipment, the operation and the failure status before the power failure are stored and retained. Therefore, if there is a failure at the time of a power failure, it will be kept stopped even if the power is restored, but if it is in a normal operating state at the time of a power failure, restarting will be started when the power is restored.
There is no need to redo driving operations, improving usability.

Further, in the case of using the automatic recovery type overheat abnormality safety device which automatically recovers when the temperature decreases, the operating temperature is set to a low level so that the safety is not impaired. Moreover, it can be reused, further improving usability.

Further, in the case where the judgment is made by counting the number of stoppages, even if the automatic recovery type overheat abnormality safety device which automatically recovers when the temperature is lowered is used, the overheat abnormality device is unlimited. It is possible to prevent the repeated operation and return of the device, the life of the device can be extended, and the safety is further enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an operation control device for a combustion device according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the operation control device at the time of reenergization.

FIG. 3 is a block diagram showing an operation control device for a combustion device according to a second embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of the operation control device when reenergized.

FIG. 5 is a sectional view of a combustion device used in the present invention and a conventional example.

FIG. 6 is a structural explanatory view showing a burner portion of the combustion device.

[Explanation of symbols]

 2 Operation instruction means 6 Combustion control section 10 Failure detection section 12 Operation state detection section 13 Operation status storage means 14 Power supply section 16 Operation restart determination means 18 Overheat abnormality safety device 20 Counter

Claims (3)

[Claims] 1. A driving instructing means for instructing driving / stopping of a combustion device, a combustion control section for controlling combustion in response to an instruction from the driving instructing means, and an operation status detection for detecting an operating status of the combustion control section. Section, a failure detection section that detects a failure of the combustion equipment, a failure content detected by this failure detection section, and an operation status storage unit that keeps storing the content of the operation status detection section even if the power is cut off, An operation control device for a combustor, which comprises an operation restart determination means for determining whether to restart or stop the combustion operation when the power is restored, depending on the contents of the operation status storage means. 2. A driving instructing means for instructing driving / stopping of a combustion device, a combustion control section for controlling combustion in response to an instruction of the driving instructing means, and an operation status detection for detecting an operating status of the combustion control section. Section, a failure detection section that detects a failure of the combustion equipment, a failure content detected by this failure detection section, and an operation status storage unit that keeps storing the content of the operation status detection section even if the power is cut off, According to the content of the operation status storage means, an operation restart determination means for determining whether to restart or stop the combustion operation when the power is restored,
The above combustion control unit is an operation control device for a combustor connected to a power source through an automatic recovery type overheat abnormality safety device that operates when the internal temperature of the device becomes abnormally high and automatically recovers when the temperature decreases. 3. A driving instructing means for instructing driving / stopping of a combustion device, a combustion control section for controlling combustion in response to an instruction of the driving instructing means, and an operation status detection for detecting an operating status of the combustion control section. Section, a failure detection section that detects a failure of the combustion equipment, a counter that counts the number of times combustion operation is restarted when the power is restored, a failure content detected by the failure detection section, and the operating state detection section. Whether the combustion operation is restarted or stopped when the power is restored is determined based on the operation status storage means that continues to store and retain the content and the content of the counter even when the power is cut off. The combustion control section operates when the internal temperature of the equipment becomes abnormally high, and automatically recovers when the temperature decreases. Operation control device for the connected combustor.