JP2017040453A - Combustion device and fan heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an ambient temperature from rising too high.SOLUTION: A combustion device includes: a temperature detection part for detecting an ambient temperature; a combustion part for combusting a fuel; an adjustment part for adjusting a supply amount of the fuel; an operation reception part for receiving a user operation with respect to the combustion device; a storage part for storing a predetermined temperature specific to the combustion device; and a control part for controlling the combustion device. The control part includes a combustion amount control part which determines a combustion amount for making the ambient temperature a predetermined temperature, based on a difference between the ambient temperature and the predetermined temperature, in a range which does not exceed the combustion amount instructed by the user operation, and which controls the adjustment part so that the combustion amount of the combustion part becomes the determined combustion amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a combustion apparatus and a fan heater, and more particularly, to a combustion apparatus and a fan heater that variably controls a combustion amount.

  Conventionally, in a hot air heater (for example, a gas fan heater), an automatic operation mode for controlling the combustion amount (unit: kcal / hour or kW) based on the difference between the room temperature and the set temperature so that the room temperature is set as the set temperature. And a continuous operation mode in which continuous combustion is performed at a constant combustion amount regardless of the room temperature is known. The continuous operation mode is often used to “warm the user in front of the fan heater when it is cold”.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 10-54610) discloses a hot air heater capable of switching between a continuous operation mode in which continuous operation is performed at a set combustion amount and an automatic mode in which room temperature is maintained at a set temperature.

JP-A-10-54610

  In the conventional continuous operation mode as disclosed in Patent Document 1, since the operation is performed with a constant combustion amount regardless of the ambient temperature, the room temperature rises excessively when operated continuously for a long time. There are cases. Therefore, for example, when a user who has temporarily left the room during the continuous operation mode returns to the room, the room temperature rises too hot, and energy is wasted.

  Therefore, an object of certain aspects of the present disclosure is to provide a combustion device and a fan heater that prevent the ambient temperature from rising too high.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

  A combustion apparatus according to an aspect of the present disclosure includes a temperature detection unit for detecting an ambient temperature, a combustion unit for burning fuel, an adjustment unit for adjusting a supply amount of fuel, and a user operation on the combustion device The operation reception part which receives, The memory | storage part which memorize | stores the predetermined temperature intrinsic | native to a combustion apparatus, The control part for controlling a combustion apparatus is provided. The control unit determines a combustion amount for setting the ambient temperature to the predetermined temperature based on a difference between the ambient temperature and the predetermined temperature within a range not exceeding the combustion amount instructed by a user operation, and the combustion amount of the combustion unit Includes a combustion amount control unit that controls the adjustment unit such that the determined combustion amount becomes the determined combustion amount.

  Preferably, the combustion amount instructed by the user operation is equal to or less than the maximum combustion amount combustible by the combustion unit.

  Preferably, the control unit further controls the adjustment unit so that the combustion amount changes based on a difference between the ambient temperature and the set temperature so that the ambient temperature becomes a set temperature set by a user operation. Including a control unit.

  Preferably, the combustion device has a switchable operation mode, and the operation mode includes an operation mode by the combustion amount control unit and an operation mode by the temperature control unit, and the predetermined temperature is for the operation mode by the temperature control unit. Shows the temperature above the maximum temperature that can be set by user operation.

  Preferably, the control unit further includes a combustion stop unit that controls the adjustment unit so that the combustion is stopped when the ambient temperature reaches a predetermined temperature higher than the predetermined temperature.

  Preferably, the combustion stop unit controls the adjustment unit so that the fuel supply and the supply stop are alternately performed until the ambient temperature reaches a predetermined temperature.

  Preferably, the combustion stop unit determines the length of at least one of the fuel supply time and the supply stop time that are alternately performed based on a difference between the ambient temperature and the predetermined temperature.

  In another aspect of the present disclosure, a fan heater including the above-described combustion device is provided.

  According to the present disclosure, the ambient temperature is prevented from excessively rising.

It is a figure which shows schematically the structure of the combustion apparatus which concerns on embodiment of this invention. It is a figure which shows schematically the structure of the microcomputer 10 of FIG. It is a figure which shows schematically the structure of the function of the gas fan heater 50 which concerns on this Embodiment. It is a figure which shows typically the control method of the combustion amount in the spot heating mode which concerns on this Embodiment. It is a flowchart of the process which controls the driving | operation of the gas fan heater 50 which concerns on this Embodiment. It is a flowchart of the process which controls the driving | operation of the gas fan heater 50 which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Technology]
The technical idea according to the present embodiment is that, when operating so as not to exceed the instructed combustion amount, the heating device adjusts the fuel supply amount to the combustion unit based on the difference between the ambient temperature and the predetermined temperature. To do. Accordingly, even when an operation with a constant combustion amount (an operation that does not exceed the instructed combustion amount) is performed, it is possible to prevent the ambient temperature from rising excessively.

  First, a heating device according to an embodiment of the present invention will be described. Although the heating apparatus according to the present embodiment describes an apparatus that burns fuel gas, the fuel is not limited to gas.

(Hardware configuration)
FIG. 1 is a diagram schematically showing a configuration of a combustion apparatus according to an embodiment of the present invention. In the present embodiment, a gas fan heater will be described as an example of a combustion apparatus. As is well known, the gas fan heater performs warm air heating by outputting warm air obtained by the combustion heat of gas as fuel.

  With reference to FIG. 1, the gas fan heater 50 constitutes an exterior of the device with an exterior case 66, a top plate 74 and a bottom plate 75. The exterior case 66 has a warm air outlet 65 and an air inlet 67. An air filter 68 is provided at the air suction port 67. A room temperature detector 69 is provided in the vicinity of the air inlet 67. When the power plug 86 is inserted into an outlet (not shown), power is supplied to each part of the gas fan heater 50. The room temperature detector 69 is an embodiment of a “temperature detector” for detecting the ambient temperature of the gas fan heater 50.

  Inside the exterior case 66, a combustion chamber 62, a blower fan 63 and a fan motor 64 for blowing air into the combustion chamber 62 are provided. In relation to the blower fan 63, a driving fan motor 64 and a rotation speed detector 80 of the fan motor 64 are provided. Inside the combustion chamber 62, a gas burner 61 that constitutes a combustion part, and an ignition part 77 for igniting the gas burner 61 are provided.

  In the gas burner 61, the mixed gas in which the fuel gas and the air sucked by the blower fan 63 are mixed is ignited by a spark (electric spark) from the ignition unit 77. Thereby, ignition to the gas burner 61 by the ignition part 77 is implement | achieved. The combustion heat generated in the combustion chamber 62 due to the combustion of the mixed gas convects in the combustion chamber by the blowing of the blower fan 63. A cover plate 78 is provided on the upper surface and the front surface of the combustion chamber 62. The fan case 79 is configured to guide the warm air convected by the blower fan 63 to the warm air outlet 65.

  The outer case 66 has a gas connection port 81 for supplying combustion gas, which is fuel, to the inside at the lower part of the back surface. Combustion gas supplied to the gas connection port 81 includes an electromagnetic valve 45 that is controlled to be opened and closed to supply / shut off the gas, a proportional valve 25 for adjusting gas pressure (that is, gas amount per unit time), and It is supplied to the gas burner 61 via the gas pipe 84. The electromagnetic valve 45 corresponds to a so-called gas main plug, and the proportional valve 25 corresponds to an adjustment valve that is variably controlled to adjust the gas supply amount from the electromagnetic valve 45 to the gas burner 61. The electromagnetic valve 45 and the proportional valve 25 are an example of an “adjusting unit” for adjusting the supply amount of fuel (gas).

  An operation display unit 16 is provided in front of the top plate 74. The operation display unit 16 includes an operation unit 14 (described later), a display unit 15 (described later) such as a liquid crystal for outputting various types of information, a LED (Light Emitting Diode) lamp, and the like. The operation unit 14 includes various switches that are operated to input a start / stop instruction for operation, and a setting instruction related to temperature and combustion amount. The operation unit 14 corresponds to an example of an “operation reception unit” for receiving a user operation on the gas fan heater 50.

  The gas fan heater 50 includes a microcomputer (hereinafter abbreviated as “microcomputer”) 10 for controlling the above-described units. The microcomputer 10 is an embodiment of a control unit for centrally controlling and monitoring the gas fan heater 50. FIG. 2 is a diagram schematically showing the configuration of the microcomputer 10 of FIG. Referring to FIG. 2, the microcomputer 10 includes a CPU (Central Processing Unit) 11, a memory unit 12 including a volatile and nonvolatile storage device for storing programs and data, and other units in the gas fan heater 50. Are provided with an interface unit 13, an operation display unit 16 and a timer 17. The display data from the CPU 11 is output to the operation display unit 16, and the display unit 15 is driven based on the display data to display information. Further, the CPU 11 accepts the user's operation contents for the gas fan heater 50 in the operation unit 14.

(Functional configuration)
FIG. 3 is a diagram schematically showing a functional configuration of the gas fan heater 50 according to the present embodiment. Each unit in FIG. 3 is provided as a program executed by the CPU 11. These programs are stored in the memory unit 12 and read and executed by the CPU 11.

  Referring to FIG. 3, CPU 11 includes a combustion amount control unit 21, a temperature control unit 22, and a combustion stop unit 23. Here, the gas fan heater 50 has a switchable operation mode. This operation mode includes an operation mode (hereinafter also referred to as spot heating mode) controlled by the combustion amount control unit 21 and an operation mode (hereinafter referred to as temperature control mode) controlled by the temperature control unit 22. The CPU 11 switches the operation mode according to the switching operation received from the operation unit 14.

  First, in the spot heating mode, the combustion amount control unit 21 sets the proportional valve 25 so that the combustion amount in the gas burner 61 does not exceed the instructed combustion amount and changes based on the difference between the ambient temperature and the predetermined temperature. Control the opening. Specifically, the combustion amount control unit 21 sets the target heat generation amount in the gas burner 61 according to the temperature difference between the predetermined temperature and the ambient temperature so that the ambient temperature detected by the room temperature detector 69 becomes the predetermined temperature. That is, the target combustion amount (kcal / hour, or kW: where the instructed combustion amount is not exceeded) is determined. Here, “so that the ambient temperature becomes the predetermined temperature” means that the ambient temperature is brought close to the predetermined temperature, that is, the ambient temperature does not greatly exceed the predetermined temperature.

  In the temperature control mode, the temperature control unit 22 sets the ambient temperature and the set temperature so that the ambient temperature detected by the room temperature detector 69 becomes the set temperature set by the user via the operation unit 14. Based on the difference, the opening degree of the proportional valve 25 is controlled so that the combustion amount changes. Specifically, the temperature control unit 22 determines a target heat generation amount in the gas burner 61, that is, a target combustion amount (kcal / hour, or kW) according to a temperature difference between the set temperature and the ambient temperature. Since the method for determining the target combustion amount by the temperature control unit 22 follows a well-known proportional control method, detailed description thereof will not be repeated.

  When the target combustion amount is determined as described above, the combustion amount control unit 21 or the temperature control unit 22 performs the following processing in the same manner, and here, the processing is performed by the combustion amount control unit 21. The case where the process is performed by the temperature control unit 22 will not be repeated. When the combustion amount control unit 21 determines the target combustion amount as described above, in order to control the opening degree of the proportional valve 25, the amount of current flowing in the drive circuit (not shown) of the proportional valve 25 is used as the target combustion amount. Adjust variably according to the amount. The target combustion amount based on the temperature difference is determined by calculating according to a predetermined arithmetic expression. Further, the amount of current supplied to the proportional valve 25 so as to become the target combustion amount is also determined by calculating according to a predetermined arithmetic expression. The amount of current supplied to the proportional valve 25 can be determined using, for example, a well-known arithmetic expression according to PID (Proportional-Integral-Derivative Controller).

  The amount of gas supplied to the gas burner 61 is adjusted by supplying the current amount thus determined and changing the opening of the proportional valve 25. As a result, the amount of combustion by the gas burner 61 is adjusted so as to become the target amount of combustion, and hot air having a target amount of heat is sent out.

  In the present embodiment, the amount of combustion instructed for the spot heating mode is the amount of combustion instructed (selected) by the user operating the operation unit 14.

  Further, the predetermined temperature for the spot heating mode is a temperature set for safety and economical purposes, and in the present embodiment, the predetermined temperature is written and stored in the memory unit 12 at the time of factory shipment or the like. It is an eigenvalue.

  The combustion stop unit 23 is operated when the ambient temperature detected by the room temperature detector 69 becomes a predetermined temperature (for example, 40 ° C.) higher than the predetermined temperature described above during operation of the gas fan heater 50. The solenoid valve 45 is controlled so that combustion stops. Specifically, the combustion stop unit 23 controls a switch (not shown) for switching between energization and deenergization of a drive circuit (not shown) of the electromagnetic valve 45 in order to switch opening and closing of the electromagnetic valve 45. When the ambient temperature reaches a predetermined temperature higher than the predetermined temperature described above, the combustion stop unit 23 stops the energization of the switch, thereby opening the electromagnetic valve 45 from the fully closed state. By switching, the fuel supply to the gas burner 61 is stopped, and the combustion in the gas burner 61 is stopped. As a result, the hot air is not sent from the gas fan heater 50, and the ambient temperature can be prevented from rising.

(Spot heating mode)
FIG. 4 is a diagram schematically showing a combustion amount control method in the spot heating mode according to the present embodiment. The spot heating mode is operated, for example, in response to a request that the user needs to warm only a narrow range in front of the gas fan heater 50 when it is cold. Therefore, in the present embodiment, the predetermined temperature for the spot heating mode is the highest temperature (26 ° C. in the range of the temperature that can be set by the user for the temperature control mode (for example, 12 ° C. to 26 ° C.)). ) The temperature falls within the range above and below 30 ° C. For the sake of explanation, in this embodiment, the predetermined temperature for the spot heating mode is set to, for example, 26 ° C. within the temperature in this range.

  In the present embodiment, the combustion amount instructed for the spot heating mode is determined from the combustion amount that can be switched by the gas fan heater 50. In the spot heating mode, the combustion amount of the gas burner 61 can be switched in eight stages P1 to P8. The switching of the combustion amount is realized by adjusting the amount of fuel supplied to the gas burner 61. The amount of combustion instructed for the spot heating mode is one selected from the eight stages P1 to P8 by the user's operation via the operation unit 14. In the following description, it is assumed that “P5” is selected by the user. The magnitude of the combustion amount has a relationship of P1 <P2 <P3 <P4 <P5 <P6 <P7 <P8.

  First, the spot heating mode operation is started by a user operation of the operation unit 14. Since the starting ambient temperature is generally sufficiently lower than the predetermined temperature, the temperature difference between the two is sufficiently large. Therefore, the combustion amount control unit 21 can set the target combustion amount to the maximum “P8”, for example, for 30 seconds at the start of the spot heating mode operation, and can provide a gas supply amount for setting the target combustion amount. The proportional valve 25 is controlled so that the opening degree is adjusted. As a result, the amount of fuel supplied to the gas burner 61 is maximized, the amount of combustion is increased, and the temperature of the combustion pipe can be quickly raised to stabilize the combustion flame. As a result, the ambient temperature can be quickly raised.

  When the forced maximum combustion time at the beginning of the operation ends, the combustion amount control unit 21 starts the combustion amount switching control as shown in FIG. First, the combustion amount control unit 21 switches the target combustion amount step by step from the current “P8” to P8 → P7 → P6 → P5 step by step. Each time the target combustion amount is switched, the proportional valve 25 is controlled so as to achieve an opening degree that enables a gas supply amount to be the target combustion amount after switching.

  When the target combustion amount is set to the instructed combustion amount “P5” by the above-described switching and during operation, a predetermined temperature or higher is detected as the ambient temperature, the combustion amount control unit 21 determines the temperature between the ambient temperature and the predetermined temperature. Based on the difference, the combustion amount for setting the ambient temperature to the predetermined temperature is determined as “P4”. Then, the target combustion amount is switched from “P5” to “P4”, and the proportional valve 25 is controlled so that the opening degree enables the gas supply amount of “P4” after the switching.

  Thereafter, even if the ambient temperature further increases, while the temperature difference between the ambient temperature and the predetermined temperature (that is, ambient temperature−predetermined temperature) is + 0.3 ° C. or less, the combustion amount control unit 21 performs the current target combustion amount “P4” is maintained. When the ambient temperature further rises and the temperature difference becomes + 0.3 ° C. to + 0.6 ° C., the combustion amount control unit 21 sets the combustion amount for setting the ambient temperature to the predetermined temperature based on the above temperature difference. P3 "is determined. Then, in order to switch the target combustion amount from “P4” to “P3”, the proportional valve 25 is controlled so that the opening degree enables the gas supply amount of “P3” after the switching. Further, when the ambient temperature rises and the temperature difference becomes + 0.6 ° C. to + 1.0 ° C., the combustion amount control unit 21 performs combustion for setting the ambient temperature to the predetermined temperature based on the temperature difference. The amount is determined to be “P2”. Then, in order to switch the target combustion amount from “P3” to “P2”, the proportional valve 25 is controlled so that the opening degree enables the gas supply amount of “P2” after the switching. Further, when the ambient temperature rises and the temperature difference exceeds + 1.0 ° C., the combustion amount control unit 21 sets the combustion amount for setting the ambient temperature to the predetermined temperature based on the temperature difference. To be decided. Then, in order to switch the target combustion amount from “P2” to “P1”, the proportional valve 25 is controlled so that the opening degree enables the gas supply amount of “P1” after the switching.

  Further, when the ambient temperature rises and the temperature difference exceeds + 1.3 ° C., the combustion stop unit 23 supplies and stops the gas supply to the gas burner 61 (the gas supply amount of “P1”), as will be described later. The proportional valve 25 is controlled so as to be alternately performed, and the ambient temperature is changed to a predetermined temperature. If the temperature further rises and the temperature difference becomes + 3 ° C., the ambient temperature can be lowered to a predetermined temperature by extending the gas supply stop time.

  In the case where the gas supply and the supply stop are alternately performed, for example, when intermittent combustion is performed at “P1” (see FIG. 4), “the gas supply to the gas burner 61 (the gas supply amount of“ P1 ”) and the supply stop are performed. "Proportional valve 25 is controlled to be alternately performed", and the process of "at the time of reignition after stopping combustion" may be performed. In the process of “at the time of reignition after stopping combustion”, as a process up to the combustion with the gas supply amount of “P1”, the combustion stop unit 23 performs a predetermined gas supply amount (for example, corresponding to “P4”) at the time of reignition. After that, the gas burner 61 is continuously burned at the gas supply amount for a predetermined time to warm the gas burner 61 to a temperature at which stable combustion is possible, and thereafter, as described above, “P4” → “P3” → “P2” → “P1” Implement control to reduce gas supply.

  It should be noted that the gas supply amount at the time of reignition (for example, corresponding to “P4”) is less than the maximum gas supply amount at the initial stage of normal ignition (for example, corresponding to “P8”). This is because the gas burner 61 is warmed to some extent, not in the cold state, and it is not necessary to increase the gas supply amount to the maximum amount, and the ambient temperature (room temperature) is not excessively increased.

  In the case where heating is performed such that the ambient temperature is maintained at a predetermined temperature (26 ° C.) as described above, for example, when indoor ventilation is performed, the ambient temperature decreases.

  For example, when the target combustion amount is “P1” and the ambient temperature decreases and the temperature difference becomes a negative value, the combustion amount control unit 21 sets the ambient temperature to the predetermined temperature based on the temperature difference. Is determined to be “P2”. Then, in order to switch the target combustion amount from “P1” to “P2”, the proportional valve 25 is controlled so as to have an opening that enables the gas supply amount of “P2” after the switching. As a result, when the ambient temperature rises to a predetermined temperature, the target combustion amount is not changed. However, if the temperature difference remains a negative value, the combustion amount control unit 21 Based on the difference, the combustion amount for setting the ambient temperature to the predetermined temperature is determined to be “P3”. Then, in order to switch the target combustion amount from “P2” to “P3”, the proportional valve 25 is controlled so that the opening degree enables the gas supply amount of “P3” after the switching. As a result, when the ambient temperature rises to a predetermined temperature, the target combustion amount is not changed. However, when the temperature difference remains a negative value, the combustion amount control unit 21 Based on the difference, the combustion amount for setting the ambient temperature to the predetermined temperature is determined as “P4”. Then, the target combustion amount is switched from “P3” to “P4”. If the temperature difference is still a negative value, the combustion amount control unit 21 switches the target combustion amount from “P4” to “P5”.

  If the temperature difference is still a negative value, the combustion amount control unit 21 continues the operation while maintaining the target combustion amount at “P5”.

  In the target combustion amount switching, the target combustion amount is maintained for at least a predetermined time (for example, 2 seconds) after the previous stage switching is performed, and thereafter, the combustion amount to the next stage combustion amount is maintained. Switching is performed. Thereby, even if it is a case where the structure where response speed is slow is employ | adopted as the proportional valve 25, the opening degree of the proportional valve 25 can be changed so that switching of target combustion amount may be tracked.

  According to FIG. 4, the ambient temperature becomes the predetermined temperature based on the difference between the ambient temperature and the predetermined temperature (26 ° C.) within a range not exceeding the maximum combustion amount “P5” instructed by the user operation. The target combustion amount is determined, and the opening degree of the proportional valve 25 is variably adjusted so that the combustion amount of the gas burner 61 becomes the determined combustion amount. Accordingly, during the spot heating operation, it is possible to avoid a situation in which the ambient temperature exceeds the predetermined temperature and rises too much while responding to the user's request for heating in front of the fan heater 50 described above.

(Processing flow)
5 and 6 are flowcharts of processing for controlling the operation of the gas fan heater 50 according to the present embodiment. The program according to this flowchart is stored in the memory unit 12. The CPU 11 reads a program from the memory unit 12 and executes the read program. CPU11 starts execution of this program, when the operation switch of the operation part 14 is turned ON. In the flowchart, the variable “P” representing the target combustion amount shown in FIG. 4 is used.

  Referring to FIG. 5, first, CPU 11 determines a designated operation mode based on the content of a user operation via operation unit 14 (step S1). If it is temperature control mode, the driving | operation according to said temperature control mode by the temperature control part 22 is implemented.

  On the other hand, when the CPU 11 determines that the spot heating mode is designated based on the operation content, the processing after step S3 is performed.

  First, the CPU 11 controls the electromagnetic valve 45, the proportional valve 25, the ignition unit 77, and the fan motor 64 so as to ignite the mixed gas of the gas burner 61 (step S3). At this time, the opening degree of the proportional valve 25 is set so that the target combustion amount becomes the maximum combustion amount (“P8”). Then, the combustion with the maximum combustion amount continues for a predetermined time (for example, 30 seconds) (step S5). Thereby, the temperature of the combustion pipe of the gas burner 61 can be raised quickly, and the combustion flame can be shifted to a stable state.

  Thereafter, the combustion amount control unit 21 changes the target combustion amount from P8 → P7... → P5 to the combustion amount (“P5”) instructed stepwise (step S7). Then, the target combustion amount stage control (step S9) described in FIG. 4 is performed. Further, the CPU 11 determines whether or not the operation switch is turned off via the operation unit 14 (step S11). If it is determined that an OFF operation has been performed (YES in step S11), the series of processes ends, but if an OFF operation is not determined (NO in step S11), the process returns to step S9, and the subsequent processes are the same. Repeated.

  With reference to FIG. 6, the step control of step S9 will be specifically described. First, the CPU 11 determines whether or not the ambient temperature detected by the room temperature detector 69 has reached or exceeded a safe temperature (for example, 40 ° C.) (step S21). If it is determined that the ambient temperature has become equal to or higher than the safe temperature (YES in step S21), the combustion stop unit 23 performs control so that the solenoid valve 45 is switched from open to closed so that the combustion of the gas burner 61 is stopped ( Step S23). As a result, the combustion is stopped, the hot air is not sent out, and the increase in the ambient temperature can be stopped. The safe temperature is set to 40 degrees which is predetermined for the safe use of the gas fan heater 50. However, this is an example, and is higher than a temperature (26 ° C to 30 ° C) that can be set as the predetermined temperature. Any high temperature is acceptable.

  On the other hand, when the ambient temperature is less than the safe temperature (NO in step S21), the combustion amount control unit 21 calculates the difference between the ambient temperature and the predetermined temperature (26 ° C.) (step S25), and is determined by the temperature difference. When the target combustion amount to be performed coincides with the current target combustion amount (NO in step S27), the opening degree of the proportional valve 25 is not adjusted, and the processing returns to the original processing.

  On the other hand, when the target combustion amount determined by the temperature difference does not coincide with the current target combustion amount (YES in step S27), the target combustion amount (P value) is updated (step S28).

  In step S28, as described with reference to FIG. 4, if the temperature difference (ambient temperature ≧ predetermined temperature) is satisfied, the target combustion amount is updated from “P5” to “P4” after the combustion amount holding time of 2 seconds has elapsed. And return to the original process. Further, if (predetermined temperature + 0.6 ° C.> ambient temperature ≧ predetermined temperature + 0.3 ° C.), the target combustion amount is updated from “P4” → “P3” after 2 seconds, and returns to the original processing. . On the contrary, when the ambient temperature decreases from the state where the target combustion amount is “P3” (predetermined temperature> ambient temperature ≧ predetermined temperature−0.3 ° C.), the target combustion amount becomes “P3” → “after 2 seconds. P4 "is updated, and the process returns to the original process. However, the maximum value of P indicating the target combustion amount is limited to a value (“P5”) set by the user, and the combustion amount control unit 21 sets the value of P to a value larger than “P5”. There is nothing.

  Thereby, in the spot heating operation mode, the heating operation can be performed such that the ambient temperature becomes a predetermined temperature (for example, 26 ° C.) within a range not exceeding the combustion amount (“P5”) instructed by the user operation. As a result, it is possible to solve the problem that the room temperature rises excessively due to long-time operation, such as continuous operation of Patent Document 1.

(Modification)
A modification of the combustion stop unit 23 according to the first embodiment will be described. The combustion stop unit 23 is controlled to close the electromagnetic valve 45 in order to stop the fuel supply when the ambient temperature reaches a safe temperature. However, the following control may be performed.

  Specifically, if the combustion stop unit 23 maintains a state in which the ambient temperature exceeds a predetermined temperature (for example, 1 ° C.) for a predetermined time (for example, 5 minutes), the combustion stop unit 23 increases the fuel until the ambient temperature decreases to the predetermined temperature. The solenoid valve 45 may be opened and closed so that supply and supply stop are alternately performed.

  When the fuel supply unit 23 alternately performs fuel supply and supply stop as described above, the combustion stop unit 23 determines the length of at least one of the fuel supply time and the supply stop time as the ambient temperature and the predetermined temperature. It is determined variably based on the difference. Accordingly, the larger the difference is, the longer the supply stop time (that is, the time for closing the solenoid valve 45) can be made longer than the fuel supply time, and the ambient temperature is brought closer to the predetermined temperature while suppressing the increase in the ambient temperature. be able to.

  In this modified example, also when the fuel supply and the supply stop are alternately performed, the above-described process of “at the time of reignition after the stop of combustion” is performed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  21 Combustion amount control unit, 22 Temperature control unit, 23 Combustion stop unit, 25 Proportional valve, 45 Solenoid valve, 50 Gas fan heater, 61 Gas burner, 69 Room temperature detector, 77 Ignition unit.

Claims (8)

A combustion device,
A temperature detector for detecting the ambient temperature of the combustion device;
A combustion section for burning fuel;
An adjustment unit for adjusting the amount of fuel supplied;
An operation accepting unit that accepts a user operation on the combustion device;
A storage unit for storing a predetermined temperature unique to the combustion device;
A control unit for controlling the combustion device,
The controller is
A combustion amount for setting the ambient temperature to the predetermined temperature is determined based on a difference between the ambient temperature and the predetermined temperature within a range not exceeding a combustion amount instructed by the user operation, and combustion in the combustion unit A combustion apparatus including a combustion amount control unit that controls the adjustment unit so that the amount becomes the determined combustion amount.   The combustion apparatus according to claim 1, wherein a combustion amount instructed by the user operation is equal to or less than a maximum combustion amount combustible by the combustion unit. The control unit further includes:
A temperature control unit that controls the adjustment unit so that a combustion amount changes based on a difference between the ambient temperature and the set temperature so that the ambient temperature becomes a set temperature set by the user operation The combustion apparatus according to claim 1 or 2. The combustion device has a switchable operation mode,
The operation mode includes an operation mode by the combustion amount control unit and an operation mode by the temperature control unit,
The combustion apparatus according to claim 3, wherein the predetermined temperature indicates a temperature equal to or higher than a maximum temperature that can be set by the user operation for an operation mode by the temperature control unit. The control unit further includes:
The combustion stop part which controls the said adjustment part so that combustion stops, when the said ambient temperature turns into predetermined temperature higher than the said predetermined temperature, The combustion stop part which contains any one of Claim 1 to 4 is included. The combustion apparatus according to the item. The combustion stop portion is
The combustion apparatus according to claim 5, wherein the adjustment unit is controlled so that the fuel supply and the supply stop are alternately performed until the ambient temperature reaches the predetermined temperature. The combustion stop portion is
The combustion apparatus according to claim 6, wherein a length of at least one of a fuel supply time and a supply stop time that are alternately performed is determined based on a difference between the ambient temperature and the predetermined temperature.   A fan heater provided with the combustion apparatus of any one of Claim 1 to 7.

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