JP2016023864A - Pot type combustion unit and method for controlling pot type combustion unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict deflagration under user's erroneous operation (re-starting just after occurrence of combustion fan error) at a pot type combustion unit.SOLUTION: The pot type combustion unit comprises: a pot type burner formed into a cylindrical shape comprising a bottom part; a fuel oil supply part for supplying fuel oil to the pot type burner; a heater disposed at the bottom part of the pot type burner to perform a pre-heating and ignition; a combustion fan for supplying air to the pot type burner; abnormal state detecting means for detecting abnormal state occurring at the combustion fan; stopping means to cause memory means to store a prescribed error code when the abnormal state is detected to stop an operation at the fuel oil supply part; error code determination means (S2, S4) for determining whether or not the error code is stored in the memory means; and waiting means (S8) for making a turned-on state of the heater after waiting until the temperature becomes a value lower than a prescribed allowable temperature when the result of determination is YES.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pot type combustor suitable for use in a pot burner type heating apparatus and a method for controlling the pot type combustor.

  An example of a pot burner type heater is disclosed in Patent Document 1. In this type of heater, fuel oil is gradually supplied to a bottomed cylindrical pot burner by an electromagnetic pump or the like. And the supplied fuel oil is vaporized and combusted by being heated with a heater. Moreover, in this kind of heating appliance, in order not to pollute indoor air, a sealed type is frequently used. That is, the pot burner is connected to an intake / exhaust duct extending to the outside so that the exhaust is not discharged indoors. Further, the intake duct incorporates a combustion fan that supplies air to the pot burner. The combustion fan continuously supplies air into the pot burner during combustion of the fuel oil, and continues to supply air for a predetermined time to cool the pot burner while replacing the air in the pot burner even after extinguishing the fire. It has become.

JP 2002-257338 A

By the way, when an abnormality occurs in the combustion fan in the heating appliance described above, the electromagnetic pump is forcibly stopped, and the pot burner is extinguished when the fuel oil remaining in the pot burner is burned out. However, depending on the degree of abnormality of the combustion fan, the fire may be extinguished due to lack of oxygen even though the fuel oil remains in the pot burner. In this case, since the temperature in the pot burner is high, the fuel oil continues to vaporize even after the fire is extinguished. At this time, since the vaporized fuel oil is not discharged unless the combustion fan is rotating, the high-concentration vaporized fuel oil continues to accumulate in the pot burner. It is usually noted in the instruction manual that when the heater is stopped due to an abnormality in the combustion fan, it should be restarted after removing the cause of the abnormality. However, if the user ignores this note and tries to restart, there is a risk that high concentration of vaporized fuel will ignite and deflagration will occur.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the control method of the pot type combustor which can suppress the deflagration by a user's misoperation, and a pot type combustor.

In order to solve the above problems, the present invention has the following configuration.
In the pot type combustor according to claim 1, provided in the bottom of the pot burner, a pot burner formed in a bottomed cylindrical shape, a fuel supply part for supplying fuel to the pot burner, A heater for performing preheating and ignition; a temperature sensor for detecting the temperature of the pot burner; a combustion fan for supplying air to the pot burner; an abnormality detecting means for detecting an abnormality occurring in the combustion fan; And a stop means for storing a predetermined error code in the storage means when the abnormality detecting means detects an abnormality of the combustion fan and stopping the fuel supply part, and detecting an ON operation by the user, The error code determination means for determining whether or not the predetermined error code is stored in the storage means, and the determination result of the error code determination means is affirmative If that is characterized by having a a standby unit to the heater-on state after the temperature detected by the temperature sensor has waited until below a predetermined allowable temperature.

  According to this configuration, when the abnormality of the combustion fan is detected by the abnormality detection unit, the stop unit stores the predetermined error code in the storage unit and stops the fuel oil supply unit. Thereafter, when the user performs an ON operation, the error code determination means determines that a predetermined error code is stored in the storage means, and therefore the standby means detects the temperature detected by the temperature sensor below a predetermined allowable temperature. After waiting until it becomes, the heater is turned on. Thereby, it is not ignited when the temperature of the pot burner is high, and deflagration can be suppressed.

  Furthermore, in the configuration according to claim 2, the pot-type combustor according to claim 1, further comprising a tachometer for measuring a rotation speed of the combustion fan, wherein the abnormality detection means is measured by the tachometer. The combustion fan is detected to be abnormal when the rotation speed is lower than the predetermined rotation speed and the state continues for a predetermined allowable time or longer.

  According to this configuration, when the rotational speed of the combustion fan becomes equal to or lower than the predetermined rotational speed and the state continues for a predetermined allowable time or longer, it can be detected that the combustion fan is abnormal.

  Furthermore, in the structure of Claim 3, in the pot type combustor of Claim 2, the fuel oil is kerosene, and the allowable temperature is a temperature of 150 ° C. or less.

  According to this structure, since the boiling point of the main component (kerosene) of kerosene, which is fuel oil, is about 150 to 280 ° C., by setting the allowable temperature to 150 ° C. or less, before turning the heater on, Most components can be liquefied.

  Further, in the control method for a pot type combustor according to claim 4, a pot burner formed in a bottomed cylindrical shape, a fuel supply part for supplying fuel to the pot burner, and a pot burner A heater provided at the bottom for performing preheating and ignition, a temperature sensor for detecting the temperature of the pot burner, a combustion fan for supplying air to the pot burner, and an abnormality for detecting an abnormality occurring in the combustion fan A pot-type combustor control method applied to a pot-type combustor having detection means and storage means, wherein a predetermined value is stored in the storage means when an abnormality of the combustion fan is detected by the abnormality detection means. When the stop process for stopping the fuel supply unit and the ON operation by the user are detected, the predetermined error code is stored in the storage means. If the determination result of the error code determination process and the error code determination process is affirmative, the heater is turned on after waiting until the temperature detected by the temperature sensor falls below a predetermined allowable temperature. And a waiting process for setting the state.

  According to this method, when an abnormality of the combustion fan is detected by the abnormality detection means, the predetermined error code is stored in the storage means in the stop process, and the fuel oil supply unit is stopped. After that, when the user performs an ON operation, it is determined that the predetermined error code is stored in the storage means in the error code determination process, and therefore the temperature detected by the temperature sensor is the predetermined allowable temperature in the standby process. After waiting for the following, the heater is turned on. Thereby, it is not ignited when the temperature of the pot burner is high, and deflagration can be suppressed.

  As described above, according to the present invention, in the pot type combustor, deflagration due to a user's erroneous operation can be suppressed.

It is a schematic block diagram of the principal part of the heating appliance of one Embodiment of this invention. It is a block diagram of the control circuit of this heating appliance. 4 is a flowchart of an on operation processing routine stored in a ROM. 3 is a flowchart of an off operation processing routine. 3 is a flowchart of an abnormal stop processing routine.

[Outline configuration]
The detail of the pot burner type heating appliance by one Embodiment of this invention is demonstrated.
The pot burner type heating appliance includes a pot type combustor 100 (see FIG. 1) that burns fuel oil to generate combustion gas, a combustion cylinder (not shown) that performs radiant heating by burning a metal cylinder with the combustion gas, A heat exchanger (not shown) for exchanging heat between the gas exhausted from the combustion cylinder and the air in the room;
As shown in FIG. 1, a pot type combustor 100 includes a pot burner 1 formed in a bottomed cylindrical shape, an electromagnetic pump 11, a supply pipe 12, and a fuel oil supply unit that supplies fuel oil to the pot burner. It has an injection pipe 13, an ignition heater (heater) 7 that preheats and ignites fuel oil, and a combustion fan 18 that supplies air to the pot burner 1.

  In FIG. 1, a pot burner 1 is formed in a bottomed cylindrical shape, and a plurality of primary air holes 2 and secondary air holes 3 which are circular through holes are formed in a peripheral wall thereof. The outer periphery of the pot burner 1 is surrounded by an outer cylinder 5, and an air chamber 4 is formed between them. The flame adjusting cylinder 6 is fixed to the center part in the pot burner 1 and promotes mixing of vaporized gas and combustion air. The vaporized mesh 8 is formed by folding a heat-resistant stainless steel fine wire so as to generate a capillary phenomenon, and is fixed to the bottom center portion of the pot burner 1.

  The ignition heater 7 is composed of a rod-shaped ceramic heater, and protrudes from the peripheral wall of the pot burner 1 toward the upper side of the vaporization chamber 8. The ignition heater 7 has both a function of preheating and vaporizing the fuel oil and a function of igniting the vaporized fuel oil. The injection pipe 13 is configured by a small-diameter pipe inclined downward toward the inside of the pot burner 1, and when the fuel oil is supplied, the fuel oil is injected toward the vaporization chamber 8. The protective cylinder 14 is formed in a cylindrical shape that covers the periphery of the injection pipe 13. One end of the protective cylinder 14 is fixed to the outer cylinder 5, and the other end penetrates the side wall of the pot burner 1 and is exposed inside.

  When fuel oil is supplied from a fuel tank (not shown), the oil leveler 9 maintains its oil level at a certain level. The upper lid 10 covers the upper surface of the oil leveler 9. The electromagnetic pump 11 is fixed to the upper lid 10 and supplies the fuel oil in the oil leveler 9 into the pot burner 1 through the supply pipe 12 and the injection pipe 13. The suction pump 15 is fixed on the upper lid 10 in parallel with the electromagnetic pump 11, and is interposed between the electromagnetic pump 11 and the supply pipe 12. The suction pump 15 sucks the fuel oil remaining in the supply pipe 12 and the injection pipe 13 and returns it to the oil leveler 9 in order to shorten the fire extinguishing time during fire extinguishing.

  The flame rod 16 is suspended in the pot burner 1 so as to be positioned in the combustion flame at the time of combustion, and detects ignition, misfire, abnormal combustion, and the like. The temperature sensor 17 detects the temperature of the bottom portion of the pot burner 1, is constituted by a thermistor, and is fixed in contact with the bottom rear side of the pot burner 1. The combustion fan 18 supplies air into the pot burner 1 through the air chamber 4 through the primary and secondary air holes 2 and 3. The tachometer 19 measures the rotational speed of the combustion fan 18.

[Control circuit configuration]
Next, the configuration of the control circuit in the present embodiment will be described with reference to FIG.
In FIG. 2, the CPU 32 controls each unit via the bus 30 based on a program stored in the ROM 34. The RAM 36 is used as a work memory for the CPU 32. The flash memory 38 functions as a storage unit that stores data to be retained even after the power supply of the heating appliance is turned off. In particular, an error code for specifying the content of the abnormality is written in the flash memory 38 when the heating appliance abnormally stops. The operation unit 40 is provided with an operator for supplying various commands (for example, setting of a target room temperature) to the CPU 32 based on a user operation. In particular, the operation unit 40 is provided with an operation switch 40a that toggles the on / off state of the heating appliance.

  The display unit 42 displays various information to the user. The I / O interface 44 performs various input / output controls under the control of the CPU 32. That is, the I / O interface 44 obtains the combustion state, the bottom temperature of the pot burner 1 and the rotational speed of the combustion fan 18 from the frame rod 16, the temperature sensor 17 and the tachometer 19, and supplies them to the CPU 32. Based on the command, the operations of the ignition heater 7, the electromagnetic pump 11, the suction pump 15, and the combustion fan 18 are controlled.

[Operation of the embodiment]
<Normal operation>
Next, the operation of the present embodiment will be described. First, the operation when the heating appliance is normal will be described.
When the user presses the operation switch 40a while the heating appliance is stopped, this is regarded as “ON operation”, and the ON operation processing routine shown in FIG. 3 is started. In FIG. 3, when the process proceeds to step S <b> 2, it is determined whether or not there is an error code written in the flash memory 38 when the heater is stopped last time. If there is no error code, it is determined as “No”, the process proceeds to step S12, and the “combustion start sequence” is executed.

  This combustion start sequence is as follows. First, the ignition heater 7 is energized, the combustion fan 18 is driven at a low speed (for example, 1250 rpm), and the temperature of the pot burner 1 is gradually raised. Next, when a predetermined time elapses after the ignition heater 7 is energized and the temperature detected by the temperature sensor 17 is equal to or higher than a predetermined temperature (for example, 80 ° C. or higher), driving of the electromagnetic pump 11 is started and the combustion fan 18 is started. Is slightly increased (for example, 1500 rpm). The fuel oil injected from the electromagnetic pump 11 through the injection pipe 13 is vaporized and ignited by the vaporization chamber 8 and the ignition heater 7.

  Thereafter, the injection oil amount of the electromagnetic pump 11 and the rotational speed of the combustion fan 18 are increased stepwise. In this process, when the temperature of the pot burner 1 becomes high, combustion can be continued without energizing the ignition heater 7, so that the ignition heater 7 is turned off. When the combustion start sequence ends, the process proceeds to step S14, and the “main combustion” process is executed. Here, “main combustion” is a state in which the injection oil amount of the electromagnetic pump 11 is automatically controlled according to the current conditions such as the room temperature so that the room temperature designated by the user in the operation unit 40 is realized. It is.

  Next, when the user depresses the operation switch 40a during the operation of the heater, this is regarded as an “off operation”, and the off operation processing routine shown in FIG. 4 is started. In FIG. 4, when the process proceeds to step S20, the supply of fuel oil is stopped. That is, fuel injection by the electromagnetic pump 11 is stopped, and fuel oil remaining in the supply pipe 12 and the injection pipe 13 is returned to the oil leveler 9 by the suction pump 15. Next, when the process proceeds to step S22, the process waits for a predetermined cooling time. That is, the combustion fan 18 continues to be driven during this cooling time.

  Here, the reason why the combustion fan 18 is continuously driven for the cooling time will be described. Even if the supply of fuel oil is stopped in step S20, since some fuel oil remains in the pot burner 1, the remaining fuel oil burns for a while, and the pot burner 1 is extinguished by burning out the fuel oil. The Therefore, it is necessary to continue intake by the combustion fan 18 during that period. Further, even after the pot burner 1 is extinguished, it is desirable to continue the intake for a certain period of time in order to cool the pot burner 1. The “cooling time” in step S22 is set to a time sufficient to complete extinguishing and cooling as long as the heater is operating normally.

  And if cooling time passes, a process will progress to step S24 and the combustion fan 18 will be stopped. When the operation of the heating appliance is normally completed, when the user subsequently depresses the operation switch 40a, the combustion start sequence (S12) is immediately executed via step S2 in FIG. Therefore, even if the heater is stopped by accidentally pressing the operation switch 40a during operation, the heater can be restarted in a relatively short time by pressing the operation switch 40a again.

<Operation when combustion fan 18 is abnormal>
Next, the operation when a factor that should cause an abnormal stop in the heating appliance occurs will be described. When a factor that should cause an abnormal stop occurs for some reason, the abnormal stop processing routine shown in FIG. 5 is started. The case where abnormality occurs in the combustion fan 18 is also included in the category. In other words, the CPU 32 has a function of an abnormality detection means 32a (see FIG. 2) that detects an abnormality that has occurred in the combustion fan 18. Hereinafter, an abnormal stop factor caused by the combustion fan 18 is referred to as a “combustion fan error”. The rotational speed of the combustion fan 18 is constantly monitored via a tachometer 19, and the rotational speed is equal to or lower than a predetermined minimum rotational speed (for example, 300 rpm), and the state is a predetermined maximum allowable time (for example, 30). If it continues for more than 2 seconds), the combustion fan error is confirmed and the routine is started.

Here, the case where the combustion fan error is determined can be specifically considered as follows.
・ When the combustion fan itself fails ・ When foreign matter such as insects enters the combustion fan and inhibits rotation ・ When strong air blows in from the exhaust duct and the rotation of the combustion fan is temporarily blocked The “minimum rotation speed (300 rpm)” described above is set to a value considerably lower than the rotation speed at the normal time, and the “maximum permissible time” is secured about several tens of seconds. This is because smooth rotation of the combustion fan cannot always be expected due to freezing of the bearing portion, solidification of grease, etc., particularly at the start of the combustion fan.

  Now, when the process proceeds to step S26 in FIG. 5, an error code specifying an abnormal stop factor (in this case, a combustion fan error) is written to a predetermined address of the flash memory 38, and the error code is displayed via the display unit 42. Displayed. Next, when the process proceeds to step S28, the above-described off operation process routine (FIG. 4) is called. As a result, the supply of fuel oil is stopped (S20), and after the drive command is continuously given to the combustion fan 18 for the cooling time (S22), the combustion fan 18 is stopped (S24). In other words, in steps S26 and S28, the CPU 32 causes the storage unit (38) to store a predetermined error code when the abnormality detection unit 32a detects an abnormality in the combustion fan 18, and the fuel supply unit (11, 12). , 13) as a stopping means 32b (see FIG. 2) for stopping.

  Here, even if a drive command is continuously given to the combustion fan 18 during the cooling time, normal intake cannot be performed when the abnormality of the combustion fan 18 continues. The pot burner 1 may be extinguished with the fuel oil remaining. In that case, the remaining fuel oil is vaporized due to the high temperature in the pot burner 1, but if the combustion fan 18 continues to be abnormal, the vaporized fuel oil is not discharged, and the high-concentration vaporized fuel oil fills the pot burner 1 In this state, the heater will stop.

  As described above, it is usually noted in the instruction manual that the heater should be restarted after removing the cause of the abnormality when the heater is stopped due to a combustion fan error. However, the user may ignore this note and press the operation switch 40a. When the operation switch 40a is pressed, this is regarded as “ON operation”, and the ON operation processing routine (FIG. 3) is started again. As described above, when a combustion fan error occurs during the previous operation, the error code is stored in the flash memory 38, so that “Yes” is determined in step S2, and the process proceeds to step S4. In step S4, it is determined whether or not the stored error code is a “combustion fan error”.

  As described above, when the CPU 32 detects an ON operation by the user by the processing in steps S2 and S4, the error code determination means 32c (see FIG. 5) determines whether or not a predetermined error code is stored in the storage means (38). 2). If the error code is other than a combustion fan error, “No” is determined in step S4, the process proceeds to step S6, and the process corresponding to the error code is executed. Note that the processing content after step S6 differs depending on the type of error code, and is therefore omitted.

  On the other hand, when the error code is “combustion fan error”, it is determined as “Yes”, and the process proceeds to step S8. Here, it is determined whether or not the temperature of the pot burner 1 measured by the temperature sensor 17 is equal to or lower than a predetermined allowable temperature (for example, 120 ° C.). Then, when the temperature of the pot burner 1 becomes equal to or lower than the allowable temperature, “Yes” is determined in step S8, and the process proceeds to step S10. Here, the error code stored in the flash memory 38 is cleared (no error is set), and thereafter, the combustion start sequence (S12) and the main combustion process (S14) are sequentially executed. As described above, the CPU 32 waits until the temperature detected by the temperature sensor 17 is equal to or lower than the predetermined allowable temperature when the determination result of the error code determination unit 32c (S2, S4) is affirmative. After that, it has a function as standby means 32d for turning on the heater (7).

Here, the meaning of step S8 described above will be described in further detail.
The execution of step S8 means that the heating appliance has been forcibly stopped due to a combustion fan error during the previous operation, and there is a possibility that highly concentrated vaporized fuel oil remains in the pot burner 1. If the combustion start sequence is immediately executed in this state, there is a possibility that high concentration vaporized fuel may cause deflagration. However, when waiting until the temperature of the pot burner 1 becomes sufficiently low, most of the vaporized fuel oil is liquefied, so even if deflagration occurs, it can be suppressed to a small scale. When the fuel oil is kerosene, the main component (kerosene) has a boiling point of about 150 to 280 ° C. Therefore, if the allowable temperature is about 120 ° C. as described above, most of the components can be liquefied. .

  Thus, according to the present embodiment, when the abnormality of the combustion fan 18 is detected by the abnormality detection means 32a, the predetermined error code is stored in the storage means (38), and the fuel supply parts (11, 12, 13) are stored. ) And an error code determination means 32c (S2, S2) for determining whether or not a predetermined error code is stored in the storage means (38) upon detecting an ON operation by the user. If the determination result of S4) and the error code determination means 32c is affirmative, the process waits until the temperature detected by the temperature sensor (17) falls below a predetermined allowable temperature, and then waits to turn on the heater (7). Means 32d (S8), even if the user immediately turns on the heater after the heater has stopped due to an abnormality in the combustion fan 18, Processing in the standby unit 32d (S8) until the temperature of the burner 1 is less than the allowable temperature waits. Thereby, the fuel oil which has vaporized can be liquefied within a waiting period, and deflagration can be suppressed.

[Modification]
The present invention is not limited to the above-described embodiment, and various modifications can be made as follows, for example.
(1) Although the said embodiment demonstrated the example which applied this invention to the heating appliance, this invention is not restricted to a heating appliance, It can use for the various apparatuses using a pot type combustor.
(2) In the above embodiment, the allowable temperature at which the combustion start sequence is started again after a combustion fan error has occurred is 120 ° C. However, this temperature need not be 120 ° C., and the main component of kerosene (kerosene) The permissible temperature may be appropriately selected from temperatures below 150 ° C. lower than the boiling point of
(3) The processing shown in FIGS. 3 to 4 has been described as software processing using a program in the above embodiment, but hardware using an ASIC (Application Specific Integrated Circuit) or the like. It may be a typical process.

1 Pot burners 2 and 3 Primary and secondary air holes 4 Air chamber 5 Outer cylinder 6 Flame-control cylinder 7 Ignition heater (heater)
8 Vaporization 9 Oil leveler 10 Upper lid 11 Electromagnetic pump (fuel supply part)
12 Supply pipe (fuel supply part)
13 Injection pipe (fuel supply part)
14 Protection cylinder 15 Suction pump 16 Frame rod 17 Temperature sensor 18 Combustion fan 19 Tachometer 38 Flash memory (storage means)
32 CPU (Processor)
32a Abnormality detection means 32b Stopping means 32c Error code determination means 32d Standby means 100 Pot combustor

Claims (4)

A pot burner formed in a bottomed cylindrical shape;
A fuel supply unit for supplying fuel to the pot burner;
A heater provided at the bottom of the pot burner for preheating and ignition;
A temperature sensor for detecting the temperature of the pot burner;
A combustion fan for supplying air to the pot burner;
An abnormality detecting means for detecting an abnormality occurring in the combustion fan;
Storage means;
A stop means for storing a predetermined error code in the storage means and stopping the fuel oil supply unit when an abnormality of the combustion fan is detected by the abnormality detection means;
An error code determination unit that determines whether or not the predetermined error code is stored in the storage unit when detecting an ON operation by a user;
When the determination result of the error code determination means is affirmative, the standby means for turning on the heater after waiting until the temperature detected by the temperature sensor is equal to or lower than a predetermined allowable temperature;
A pot-type combustor comprising: It further comprises a tachometer for measuring the rotational speed of the combustion fan,
The abnormality detection means detects that the combustion fan is abnormal when the rotational speed measured by the tachometer is equal to or lower than a predetermined rotational speed and the state continues for a predetermined allowable time or longer. The pot type combustor according to claim 1. The fuel oil is kerosene,
The pot type combustor according to claim 2, wherein the allowable temperature is a temperature of 150 ° C. or less. A pot burner formed in a bottomed cylindrical shape;
A fuel supply unit for supplying fuel to the pot burner;
A heater provided at the bottom of the pot burner for preheating and ignition;
A temperature sensor for detecting the temperature of the pot burner;
A combustion fan for supplying air to the pot burner;
An abnormality detecting means for detecting an abnormality occurring in the combustion fan;
Storage means;
A pot-type combustor control method applied to a pot-type combustor having
A stop process in which a predetermined error code is stored in the storage means when the abnormality of the combustion fan is detected by the abnormality detection means, and the fuel supply unit is stopped;
When detecting an ON operation by the user, an error code determination process for determining whether or not the predetermined error code is stored in the storage means;
If the determination result of the error code determination process is affirmative, a standby process of turning on the heater after waiting until the temperature detected by the temperature sensor is equal to or lower than a predetermined allowable temperature;
A method for controlling a pot-type combustor, comprising:

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