JP4581005B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater, and more particularly, to a hot air heater capable of using both a save operation and a restraint operation.

  For example, in a gas fan heater which is a hot air heater, a gas burner and a blower fan are provided in the main body case, and the indoor air is sucked by the rotation operation of the blower fan, and the air heated by the gas burner is placed indoors. By blowing air, the room temperature is raised and heating operation is performed.

  And in the hot air heater having the temperature control function, the target temperature set by the user with the temperature setting switch and the actual room temperature detected by the room temperature sensor provided in the vicinity of the indoor air suction port Are adjusted so that the combustion amount of the gas burner and the blowing amount of the blower fan are adjusted.

  As referred to Patent Document 1, a hot air heater having a save operation function (also referred to as a fuel saving operation function) is also known. In this method, after the room temperature detected by the temperature sensor reaches the target temperature, the target temperature is slightly decreased with the passage of time. Specifically, there is one in which the target temperature is lowered once when 30 minutes have passed since the room temperature reached the target temperature, and further lowered once when 30 minutes have passed.

  In addition to the target temperature being lowered by a certain temperature, the target temperature is decreased according to the size of the heating load, for example, the room temperature at the start of heating operation and the increase in the room temperature after starting the heating operation In some cases, the degree of decrease in the target temperature in the save operation is changed according to the degree.

  Thus, even if the target temperature is slightly lowered, the user's perceived temperature does not change much. Therefore, by providing the warm air heater with a save operation function, the combustion amount of the gas burner can be reduced, and the fuel consumption can be improved without causing discomfort to the user.

  On the other hand, there is also known a hot air heater equipped with a restraining operation function (also referred to as an on / off operation function). If the detected temperature of the temperature sensor continues to rise even if the amount of combustion of the gas burner is minimized, excessive heating is prevented by interrupting the combustion operation of the gas burner so that the room temperature substantially matches the target temperature. It assists the temperature control function. Specifically, when the room temperature becomes higher than the target temperature by a predetermined temperature or more, the combustion operation of the gas burner is stopped, and after the stop, the combustion of the gas burner is performed when the room temperature falls to the heating restart temperature set near the target temperature. Driving is resumed.

Further, as referred to Patent Document 2, there is also known a hot air heater capable of using both the save operation function and the restraining operation function. In this warm air heater, the temperature that falls during the save operation is set to be smaller than the predetermined temperature when the combustion operation of the gas burner is stopped during the restraint operation.
JP-A-8-189708 JP-A-11-23064

  However, when the above-described save operation function and restraint operation function are used in combination, the following inconvenience occurs when the heating load is small, such as when the difference between the outside air temperature in spring and the room temperature is small. That is, the room temperature gradually decreases after the combustion operation of the gas burner stops after the room temperature becomes higher than the target temperature by the restraint operation, but the temperature decrease is slower than the target temperature decrease due to the save operation. There is. At this time, the room temperature did not reach the heating resumption temperature, the combustion operation of the gas burner was stopped for a long time, and there was an inconvenience that the user could think that a problem occurred in the hot air heater.

  In view of the above circumstances, the present invention provides a warm air heater that does not stop the heating operation of the heating source for a long time even when the save operation and the restraint operation are used in combination. Objective.

The hot air heater of the present invention includes a heating source, a blower fan that sends air heated by the heating source into the room, a temperature sensor that detects a room temperature, a set temperature input unit that inputs a set temperature, Target temperature setting means for setting the set temperature input to the set temperature input means as an initial target temperature, and the heating amount of the heating source is determined so that the detected temperature of the temperature sensor and the target temperature match. A heating amount determining means, a save operation setting means for causing the target temperature setting means to set the target temperature by lowering the predetermined temperature after a predetermined time has elapsed after the detected temperature reaches the target temperature, and the detected temperature wherein when it becomes higher than a predetermined temperature than the target temperature, the detected temperature, said in response to the target temperature down to a preset heating resumed temperature, holding Me luck to limit the heating amount of the heating source And a setting unit, wherein a saving operation setting means and said retainer Me operation setting means is on, when the retainer Me operation setting means has limited the heating amount of the heating source, the heating said detected temperature is lowered The save operation setting means does not cause the target temperature setting means to lower the target temperature until the temperature becomes equal to or lower than the restart temperature.

  According to the hot air heater of the present invention, when both the save operation setting means and the restraint operation setting means are set to ON, when the restraint operation setting means restricts the heating amount of the heating source, the detected temperature is The save operation setting means does not cause the target temperature setting means to lower the target temperature and set it until the temperature drops below the heating restart temperature. Therefore, when the heating load is small, such as when the difference between the outside air temperature and room temperature in early spring is small, if the detected temperature is higher than the target temperature by a predetermined temperature or more and the temperature drop of the room temperature is slow after the heating amount of the heating source is limited Even if a predetermined time elapses after the detected temperature reaches the target temperature, the target temperature does not decrease unless the detected temperature becomes equal to or lower than the heating restart temperature. Therefore, the inconvenience that the detection temperature does not reach the heating resumption temperature, the heating of the heating source is limited for a long time, and the user can be considered to have failed in the hot air heater can be reliably solved. it can.

  Note that “after the predetermined time has elapsed since the detected temperature reached the target temperature, the target temperature setting means causes the target temperature to be set by lowering the predetermined temperature” means that the detected temperature has reached the target temperature. This means that, after a predetermined time has elapsed since then, the target temperature setting means performs a setting for lowering the target temperature by a predetermined temperature uniquely corresponding to the predetermined time. Moreover, the combination of these predetermined time and predetermined temperature may be one, or may be multiple. Moreover, you may provide a restriction | limiting in the fall temperature range from the original target temperature. Further, the predetermined time is an accumulated time after the detected temperature reaches the target temperature. In this case, even if the target temperature is the initial target temperature set by the target temperature setting means, The target temperature may be a target temperature that is reduced from the target temperature by a save operation setting means.

Furthermore, “ the heating resumption temperature set in advance corresponding to the target temperature” means that the heating resumption temperature is uniquely determined corresponding to the target temperature. The heating resumption temperature is set in the vicinity of the target temperature by a predetermined method such as increasing or decreasing a predetermined temperature that is the same as or slightly smaller than the target temperature, for example, 0.5 degrees. The heating resumption temperature may be set in consideration of the outside air temperature, the room temperature increase rate of room temperature, and the like.

  Furthermore, “limit the heating amount of the heating source” means that the heating amount is suppressed more than the heating amount of the heating source that is normally determined by the heating amount determination means. For example, the heating amount of the heating source is set to 0, the heating is interrupted, the heating amount of the heating source is intermittently set to 0, the heating amount of the heating source determined by the heating amount determining means is halved, and the like. .

  Moreover, the warm air heater of the present invention preferably includes setting input means capable of independently setting on / off of the save operation setting means and the restraining operation setting means.

  In this case, the user can freely set the on / off of the save operation setting means and the restraint operation setting means according to his / her preference.

  In the hot air heater of the present invention, it is also preferable to include a single setting input unit that can set on / off of the save operation setting unit and the restraint operation setting unit in common.

  In this case, the user always sets ON / OFF of the save operation setting means and the restraint operation setting means, so that the benefit of eliminating the above inconvenience is great. Even if the save operation setting means or the restraint operation setting means is set to ON, there may be no fuel saving effect depending on conditions. That is, even if the save operation setting means is set to ON, when the heating load is smaller than the heating capacity by the minimum heating amount of the heating source, the heating capacity cannot be lowered any more, so there is no fuel saving effect. . On the other hand, even if the restraint operation setting means is set to ON, when the room temperature becomes higher than the set temperature, the heating amount of the heating source is not limited when the heating load is larger than the heating capacity by the minimum heating amount of the heating source. So there is no fuel saving effect. In such a case, other operation setting means may be turned on, but it is difficult for a general user to select an appropriate operation setting according to the heating load. Therefore, a single setting input unit capable of turning on both the save operation setting unit and the restraint operation setting unit is provided, and by eliminating the above inconvenience, a general user can save the operation setting without hesitation. It is possible to reliably set an operation setting that can reliably exert the fuel efficiency effect.

  A hot air heater A according to a first embodiment of the present invention will be described with reference to FIGS.

  Referring to FIG. 1, a hot air heater A includes a duct 2, a blower fan 3, a gas burner (heating source) 4, an air supply duct 5, a gas supply pipe 6, and a main body case 1 installed indoors. A control unit 7 is provided.

  The duct 2 constitutes a hot air blowing path, and an intake port 8 for taking in indoor air s is opened in the back surface of the main body case 1, and a hot air outlet 9 is formed in the lower front portion of the main body case 1. It is open. An air filter 10 is detachably attached to the air inlet 8 in order to prevent dust and dirt from flowing into the duct 2. A movable louver 11 that adjusts the degree of opening is attached to the air outlet 9, and a geared motor 12 for driving the movable louver 11 is provided.

  The blower fan 3 includes a fan motor 14 whose rotational speed changes in proportion to the energization current, and a rotary blade 15 that is disposed in the duct 2 so as to face the air outlet 9 and is driven to rotate by the fan motor 14. The room air s is sucked into the duct 2 from the air inlet 8 by the rotation of the rotary blade 15. Then, the sucked indoor air s is mixed with the combustion exhaust h of the gas burner 4 incorporated in the duct 2, and is sent to the room from the outlet 9 as hot air m. The blower fan 3 is provided with a rotation speed sensor 16 constituted by a Hall element or the like that detects the rotation speed of the fan motor 14. The rotation speed sensor 16 sends a signal corresponding to the rotation speed of the fan motor 14 to the control unit. 7 is output.

  In the gas burner 4 incorporated in the duct 2, a combustion plate 18 is arranged in the combustion cylinder 17, and an ignition electrode 19 for igniting a mixture of combustion air and fuel gas is arranged in the vicinity of the combustion plate 18. is doing. The combustion exhaust h from the gas burner 4 is discharged from the combustion cylinder 17 into the duct 2. A thermocouple 20 for detecting the presence or absence of a combustion flame is disposed downstream of the combustion plate 18. When the thermocouple 20 is exposed to the combustion flame of the gas burner 4, it generates a thermoelectromotive force according to the temperature of the combustion flame and outputs the thermoelectromotive force to the control unit 7.

  The air supply duct 5 is a passage for supplying room air (combustion air) s and fuel gas to the gas burner 4. The air supply duct 5 communicates with the gas burner 4 and the inside of the combustion cylinder 17 and is defined by the duct 2. 1 has an air inlet 21 for room air s opened at the back of the main body case 1. And the nozzle 22 attached to the front-end | tip of the gas supply pipe | tube 6 is provided in the location by the side of the gas burner 4 of the air supply duct 5. FIG. In the supply duct 5, the indoor air s is sucked from the intake port 21 by the rotation operation of the blower fan 3, and the sucked indoor air s is mixed with the fuel gas ejected from the nozzle 22 of the gas supply pipe 6. The air-fuel mixture is supplied to the gas burner 4. The air inlet 21 is covered with the air filter 10 together with the air inlet 8 of the duct 2.

  Further, a temperature sensor 13 composed of a thermistor is attached to a portion near the air inlet 21 inside the air supply duct 5 so as to face the air inlet 21. The temperature sensor 13 outputs to the control unit 7 a signal indicating the room temperature (detected temperature) Tr detected regularly during the heating operation of the hot air heater A.

  The gas supply pipe 6 is provided with electromagnetic valves 24 and 25 and an electromagnetic proportional valve 26 in this order from the upstream side. The solenoid valves 24 and 25 are opened by energization from the control unit 7, and when energization is stopped, the solenoid valves 24 and 25 are closed to block the passage of fuel gas. The electromagnetic proportional valve 26 is a valve whose opening increases with the magnitude of the energization current from the control unit 7, and adjusts the amount of fuel gas supplied to the gas burner 4.

  With reference to FIGS. 2 and 3, an operation panel 27 is provided on the outer surface of the main body case 1. The operation panel 27 includes various switches such as an operation switch 28, a temperature setting switch (setting temperature input means) 29, a save operation switch (setting input means) 30, a press operation switch (setting input means) 31, and a display unit 32. Is arranged. A light emitting portion is provided around each of the operation switch 28, the save operation switch 30, and the presser operation switch 31, and the light emitting portion emits light in response to an on operation of these switches, and the user turns on / off. The setting state of can be confirmed.

  The operation switch 28 outputs a signal indicating on / off of a main power source (not shown) of the hot air heater A to the control unit 7 by an on / off operation of the user. The temperature setting switch 29 is a switch for setting a desired room temperature, and the set temperature Ta is increased or decreased, for example, in units of 1 degree by a predetermined operation by the user. The temperature setting switch 29 outputs a signal indicating the set temperature Ta set to the control unit 7.

  The save operation switch 30 is a switch for setting a save operation function for automatically lowering the target temperature Tt by a predetermined temperature ΔT1 after the room temperature Tr reaches the set temperature Ta. A signal indicating whether or not the operation function is set is output to the control unit 7. The press operation switch 31 is a switch for setting a press operation function for automatically controlling the on / off of the heating operation at the target temperature Tt, and whether the press operation function is set by the user's on / off operation. Is output to the control unit 7. The save operation switch 30 and the press operation switch 31 can independently set ON / OFF of the save operation function and the press operation function.

  The display unit 32 includes a liquid crystal panel, a digital display, and the like, and displays the current room temperature Tr detected by the temperature sensor 13, the set room temperature Ta set by the temperature setting switch 29, and the like.

  Referring to FIG. 4, control unit 7 is configured using a microcomputer or the like, and includes a target temperature setting unit (target temperature setting means) 40, a save operation setting unit (save operation setting means) 41, a temperature. The adjustment control part 42, the combustion control part 43, and the ventilation control part 44 are provided. Further, a timer 45 is connected to the control unit 7.

  The target temperature setting unit 40 sets the target temperature Tt for the heating operation from the initial set temperature Ta set by the temperature setting switch 29 and the setting by the save operation setting unit 41.

  In order to perform fuel-saving operation when the save operation switch 30 is turned on, the save operation setting unit 41 sets the target temperature Tt to the predetermined temperature ΔT1 after a predetermined time after the room temperature Tr reaches the target temperature Tt. The save operation function to be lowered is set to the target temperature setting unit 40. Here, the save operation setting unit 41 decreases the target temperature Tt by 1 degree every 30 minutes and 1 hour after the room temperature Tr reaches the target temperature Tt, that is, every time the predetermined time Δt (30 minutes) elapses. A setting instruction to be output is output to the target temperature setting unit 40. Note that the save operation setting unit 41 is configured to lower the target temperature Tt a predetermined number of times, for example, twice, here, to a maximum total of 2 degrees.

  The temperature control unit 42 performs control so that the target temperature Tt set by the target temperature setting unit 40 substantially matches the room temperature Tr detected by the temperature sensor 13. The temperature control unit 42 includes a target combustion amount determination unit (heating amount determination unit) 46 and a presser operation setting unit (presser operation setting unit) 47.

  The target combustion amount determination unit 46 determines the target combustion amount (heating amount) of the gas burner 4 so that the target temperature Tt substantially matches the room temperature Tr.

  The restraint operation setting unit 47 sets the restraint operation function for automatically interrupting the combustion of the gas burner 4 in order to prevent excessive heating when the restraint operation switch 31 is turned on. This is performed for the determination unit 41. Due to the target combustion amount determined by the target combustion amount determination unit 46, the room temperature Tr is normally stabilized within a range of about 0.5 degrees from the target temperature Tt. However, when the target temperature Tt is low, the room temperature Tr continues to rise even if the combustion amount of the gas burner 4 is minimized, and reaches a predetermined temperature ΔT2, for example, an operation interruption temperature (heating interruption temperature) Tc that is two degrees higher than the target temperature Tt. In this case, the target combustion amount of the gas burner 4 is set to 0, the combustion operation of the gas burner 4 is interrupted, and the combustion operation of the gas burner 4 is performed when the room temperature Tr falls to the operation restart temperature (heating restart temperature) Ts corresponding to the target temperature Tt. The so-called on / off control is resumed. The operation resumption temperature Ts is set near the target temperature Tt corresponding to the target temperature Tt, and is set to be the same as the target temperature Tt here. Note that when the operation mode is set and the combustion operation of the gas burner 4 is interrupted, the save operation setting unit 41 determines whether or not the target temperature setting unit 40 continues until the room temperature Tr decreases and becomes equal to or lower than the operation restart temperature Ts. Does not output the setting to lower the target temperature Tt.

  The combustion control unit 43 includes electromagnetic valves 24 and 25 and a proportional control valve 26 provided in the gas supply pipe 6 and an igniter so that the gas burner 4 burns at the target combustion amount determined by the target combustion amount determination unit 46. By performing energization control 19, ignition / extinguishment of the gas burner 4, adjustment of the combustion amount (adjustment of the fuel gas supply amount), and the like are performed. Further, the ignition / extinguishing of the gas burner 4 and the misfire detection during combustion are performed from the thermoelectromotive force output of the thermocouple 20.

  The air blow control unit 44 is set so that the fan motor 14 rotates at a target rotation speed (corresponding to the amount of combustion air supplied to the gas burner 4) set by the combustion control unit 43 and corresponding to the combustion amount of the gas burner 4. The amount of current supplied to the fan motor 14 is adjusted. That is, the amount of current supplied to the fan motor 14 is adjusted so that the target rotation speed matches the actual rotation speed of the fan motor 14 detected by the rotation speed sensor 16.

  Next, the control operation of the warm air heater A by the control unit 7 will be described with reference to the flowcharts of FIGS.

  Referring to FIG. 5, when the user turns on operation switch 28, control operation of hot air heater A by control unit 7 is started (STEP 1). The set temperature Ta set by the temperature setting switch 29 is input to the target temperature setting unit 40, and the target temperature setting unit 40 sets the set temperature Ta as the initial target temperature Tt of the heating operation (STEP 2). .

  Next, the gas burner 4 is ignited by the control unit 7 (STEP 3). Specifically, before the gas burner 4 is combusted, the air blow control unit 44 rotates the fan motor 14 for a predetermined time to perform pre-purge. Thereafter, the combustion control unit 43 opens the solenoid valves 24 and 25 to maximize the opening degree of the proportional control valve 26, and the blower control unit 44 maximizes the rotation speed of the fan motor 14 and then energizes the igniter 19. Then, the gas burner 4 is ignited. When the combustion controller 43 detects the ignition of the gas burner 4 from the thermoelectromotive force level of the thermocouple 20 until a predetermined time, for example, 30 seconds elapses after the igniter 19 is energized, Heating operation is continued for 1 minute. On the other hand, when a predetermined time has elapsed before detecting the ignition of the gas burner 4, it is determined that the ignition has failed, and the heating operation is stopped.

  Next, the heating operation that is controlled by the temperature control unit 42 is started (STEP 4). Specifically, first, the target combustion amount determination unit 46 determines the gas burner 4 based on the difference between the target temperature Tt set by the target temperature setting unit 40 and the room temperature Tr detected by the temperature sensor 13. Determine the target amount of combustion. And the combustion control part 43 varies the opening degree of the proportional control valve 26 according to the determined target combustion amount. Further, the blower control unit 44 varies the target rotational speed of the fan motor 14 in accordance with the determined target combustion amount, and the target rotational speed and the actual rotational speed detected by the rotational speed sensor 16 match. Thus, the energization amount to the fan motor 14 is adjusted. Thereby, the heating operation in which the temperature control is performed so that the room temperature Tr approaches the target temperature Tt is performed. Thereafter, the room temperature Tr gradually increases, but the heating operation in which the temperature adjustment control unit 42 performs temperature adjustment control is continued until it is determined that the room temperature Tr has exceeded the target temperature Tt (STEP 5: NO).

  When it is determined that the room temperature Tr has exceeded the target temperature Tt (STEP 5: YES), the target combustion amount determination unit 46 determines that the target combustion amount of the gas burner 4 is the minimum amount, and is the save operation function set? It is determined whether or not (STEP 6). Specifically, the determination is made based on whether or not the save operation switch 30 is turned on.

  When it is determined that the save operation function is not set (STEP 6: NO), it is determined whether or not the restraining operation function is set (STEP 7). Specifically, the determination is made based on whether or not the press operation switch 31 is turned on. When it is determined that the restraining operation function is not set (STEP 7: NO), that is, when neither the save operation function nor the restraining operation function is set, the target temperature Tt does not change and the temperature adjustment control unit 42 Heating operation for temperature control is continued.

  On the other hand, when it is determined that the restraining operation function is set (STEP 7: YES), that is, when only the restraining operation function is set, the temperature adjustment control unit 42 does not change the target temperature Tt. Heating operation for temperature control is performed. The heating operation is continued as it is until it is determined that the room temperature Tr detected by the temperature sensor 13 exceeds the operation interruption temperature Tc set by the moderation operation setting unit 47 (STEP 8: NO). When it is determined that the room temperature Tr has exceeded the operation interruption temperature Tc (STEP 8: YES), the target combustion amount determination unit 46 sets the target combustion amount of the gas burner 4 to 0, turns off the gas burner 4, and stops the heating operation ( (STEP 9). Then, the heating operation is stopped (STEP 9) until it is determined that the room temperature Tr detected by the temperature sensor 13 is equal to or lower than the operation restart temperature Ts set by the moderation operation setting unit 47 (STEP 10: NO). ). When it is determined that the room temperature Tt is equal to or lower than the operation restart temperature Ts (STEP 10: YES), the gas burner 4 is ignited (STEP 3), and the heating operation is restarted (STEP 4).

  On the other hand, when it is determined that the save operation function is set (STEP 6: YES), as shown in FIG. 6, the timer 45 is reset and then time measurement is started (STEP 11). That is, the timer 45 starts measuring time when the room temperature Tr exceeds the target temperature Tt. Then, it is determined whether or not the restraining operation function is set (STEP 12). When it is determined that the press operation function is not set (STEP 12: NO), that is, when only the save operation function is set, the timer 45 counts after a predetermined time Δt has elapsed (STEP 13: YES). The operation setting unit 41 reduces the target temperature Tt by a predetermined temperature ΔT1 (STEP 14). Thereafter, a heating operation is performed in which the temperature control unit 42 controls the temperature so that the room temperature Tr approaches the lowered new target temperature Tt.

  On the other hand, when the restraining operation function is set (STEP 12: YES), that is, when both the save operation function and the restraining operation function are set, the room temperature Tr detected by the temperature sensor 13 is the restraining operation. When it is determined that the operation interruption temperature Tc set by the setting unit 47 has been exceeded (STEP 15: NO), when the predetermined time Δt has elapsed from the start of the timer 45 (STEP 13: YES), the save operation setting unit 41 Setting is made to lower the target temperature Tt by a predetermined temperature ΔT1 (STEP 14). Along with this, the operation interruption temperature Tc and the operation resumption temperature Ts each decrease by a predetermined temperature ΔT1. Thereafter, a heating operation is performed in which the temperature control unit 42 controls the temperature so that the room temperature Tr approaches the lowered new target temperature Tt. As described above, even when the restraining operation function is set, when the room temperature Tr does not exceed the operation interruption temperature Tc, the same control as when the restraining operation function is not set is performed.

  On the other hand, when it is determined that the room temperature Tr has exceeded the operation interruption temperature Tc (STEP 15: YES), the target combustion amount determination unit 46 determines the target combustion amount of the gas burner 4 to 0, the gas burner 4 is turned off, and the heating operation is stopped. (STEP 16), the timer 45 stops counting (STEP 17). Then, until it is determined that the room temperature Tr is equal to or lower than the operation restart temperature Ts (STEP 18: NO), the heating operation is interrupted and the time count of the timer 45 is maintained. When it is determined that the room temperature Tr has become equal to or lower than the operation resumption temperature Ts (STEP 18: YES), the gas burner 4 is ignited (STEP 19) as in STEP 3, and the heating operation is restarted as in STEP 4 (STEP 20). The timing is also released and the timing is restarted (STEP 21). When the time measured by the timer 45 has elapsed a predetermined time Δt (STEP 22: YES), the save operation setting unit 41 performs a setting to decrease the target temperature Tt by the predetermined temperature ΔT1 (STEP 14). Along with this, the operation interruption temperature Tc and the operation resumption temperature Ts each decrease by a predetermined temperature ΔT1. Thereafter, a heating operation is performed in which the temperature control unit 42 controls the temperature so that the room temperature Tr approaches the lowered new target temperature Tt. As described above, when both the save operation function and the restraint operation function are set, the target temperature Tt, the operation interruption temperature Tc, and the operation resumption temperature Ts do not decrease until the room temperature Tr becomes equal to or lower than the operation resumption temperature Ts.

  FIGS. 7 to 10 are graphs showing a temperature change by the control of the control unit 7 of the hot air heater A. FIG. In the figure, Tto is also the set temperature Ta set by the temperature setting switch 29 and is the initial target temperature Tt. Tco is an initial operation interruption temperature Tc set by the control operation setting unit 47 by adding a predetermined temperature ΔT2 to the initial target temperature Tto. Note that the operation restart temperature Ts is set equal to the target temperature Tt, and is therefore equal to the target temperature Tt.

  A temperature change when the save operation and the restraint operation are used together will be described with reference to the graph of FIG. 7 and the flowcharts of FIGS. 5 and 6. When the heating operation is started (STEP 4), the room temperature Tr detected by the temperature sensor 13 gradually increases. When the room temperature Tr exceeds the initial target temperature Tto (STEP 5: YES), the timer 45 starts measuring time (STEP 11). When the room temperature Tr exceeds the operation interruption temperature Tc (= Tto + ΔT2) (STEP 15: YES), the heating operation is interrupted (STEP 16), and the timer 45 stops counting at Δt 1 (STEP 17). Thereafter, when the room temperature Tr gradually decreases and becomes equal to or lower than the operation resumption temperature Tso (= Tto) (STEP 18: YES), the heating operation is resumed (STEP 20), and the timer 45 also starts counting from Δt 1 (STEP 21). Then, after Δt2 has elapsed since the timer 45 restarted and a predetermined time Δt (= Δt1 + Δt2) has elapsed (STEP 22), the target temperature Tt decreases by a predetermined temperature ΔT1 (STEP 14). Along with this, the operation interruption temperature Tc and the operation resumption temperature Ts each decrease by a predetermined temperature ΔT1. Therefore, when the heating load is small, such as when the difference between the outside air temperature in early spring and the room temperature Tr is small, the heating operation is long even when the temperature operation Tr is stopped (STEP 16) and the temperature drop of the room temperature Tr is slow. Never stop for hours.

  On the other hand, in the conventional hot air heater, as shown in FIG. 8, even if the room temperature Tr does not drop below the operation resuming temperature Tso, the timer reaches the target temperature Tt and the operation interruption temperature Tc after a predetermined time Δt has elapsed. In addition, the operation restart temperature Ts was decreased by a predetermined temperature ΔT1. Therefore, the room temperature Tr does not reach the operation resuming temperature Ts, and the heating operation is stopped for a long time, and there is a problem that the user can think that a problem has occurred in the hot air heater.

  Next, the temperature change when the save operation is performed will be described with reference to the graph of FIG. 9 and the flowcharts of FIGS. 5 and 6. When the heating operation is started (STEP 4), the room temperature Tr gradually increases, and when the room temperature Tr exceeds the initial target temperature Tto (STEP 5: YES), the timer 45 starts measuring time (STEP 11). Then, after a predetermined time Δt has elapsed (step 13), the target temperature Tt is decreased by the predetermined temperature ΔT1 (STEP 14).

  Next, the temperature change at the time of a restraining operation is demonstrated with reference to the graph of FIG. 10, and the flowchart of FIG. When the heating operation is started (STEP 4), the room temperature Tr gradually increases. When the room temperature Tr exceeds the operation interruption temperature Tc (= Tto + ΔT2) (STEP 8: YES), the heating operation is interrupted (STEP 9), and the room temperature Tr gradually decreases. Thereafter, when the room temperature Tr becomes equal to or lower than the operation restart temperature Tso (= Tto) (STEP 10: YES), the heating operation is restarted (STEP 4).

  In addition, in the warm air heater A mentioned above, about the case provided with the save operation switch 30 and the stop operation switch 31 which can set ON / OFF of a save operation function and a restraint operation function independently, respectively. explained. However, the switch is not limited to the switch as long as the save operation function and the restraint operation function can be set on and off independently. For example, the user may set a function by operating a key, a button, a dial, a touch panel, a remote controller, or the like.

  Hereinafter, the warm air heater B which concerns on 2nd Embodiment of this invention is demonstrated with reference to FIGS. Since this hot air heater B is similar to the hot air heater A according to the first embodiment described above, only different points will be described.

  Referring to FIG. 11, an eco-operation switch (setting input means) 33 is disposed on the operation panel 27 of the hot air heater B. Unlike the hot air heater A, the save operation switch 30 and the hold-down switch 30 are pressed. Therefore, the operation switch 31 is not provided. In addition, the light emission part is provided in the circumference | surroundings of the eco-operation switch 33, a light emission part light-emits according to ON operation of the eco-operation switch 33, and the user can confirm the setting state of ON / OFF.

  The eco driving switch 33 is a switch for setting an eco driving function that unifies the save driving function and the restraining driving function. A signal indicating whether the eco driving function is set or not is sent to the control unit 7 by the user's on / off operation. Output. Referring to FIG. 12, the eco-operation switch 33 outputs a signal to the save operation setting unit 41 and the restraining operation setting unit 47 that constitute the control unit 7.

  Next, with reference to the flowchart of FIG.13 and FIG.14, the control operation of the warm air heater B by the control unit 7 is demonstrated.

  Referring to FIG. 13, when the user turns on operation switch 28, the control operation of hot air heater B by control unit 7 is started (STEP 1). The set temperature Ta set by the temperature setting switch 29 is input to the target temperature setting unit 40, and the target temperature setting unit 40 sets the set temperature Ta as the initial target temperature Tt of the heating operation (STEP 2). .

  Next, the gas burner 4 is ignited by the control unit 7 (STEP 3), and the heating operation controlled by the temperature control unit 42 is started (STEP 4).

  When it is determined that the room temperature Tr has exceeded the target temperature Tt (STEP 5: YES), the target combustion amount determination unit 46 determines that the target combustion amount of the gas burner 4 is the minimum amount, and is the eco operation function set? It is determined whether or not (STEP 31). Specifically, the determination is made based on whether or not the eco-operation switch 33 is turned on.

  When it is determined that the eco-operation function is not set (STEP 31: NO), the heating operation controlled by the temperature control unit 42 is continued without changing the target temperature Tt (STEP 4).

  On the other hand, when it is determined that the eco-driving function is set (STEP 31: YES), referring to FIG. 14, the timer 45 is reset and time measurement is started (STEP 32). That is, the timer 45 starts measuring time when the room temperature Tr exceeds the target temperature Tt. When it is determined that the room temperature Tr has exceeded the operation interruption temperature Tc (STEP 33: NO), when the predetermined time Δt has elapsed from the start of the timer 45 (STEP 34: YES), the save operation setting unit 41 sets the target temperature Tt to the predetermined value. Setting is made to lower the temperature ΔT1 (STEP 35). Along with this, the operation interruption temperature Tc and the operation resumption temperature Ts each decrease by a predetermined temperature ΔT1. Thereafter, a heating operation is performed in which the temperature control unit 42 controls the temperature so that the room temperature Tr approaches the lowered new target temperature Tt (STEP 4). As described above, when the room temperature Tr does not exceed the operation interruption temperature Tc, the heating operation is not interrupted, and the same control as when only the save operation function is set is performed.

  On the other hand, when it is determined that the room temperature Tr has exceeded the operation interruption temperature Tc (STEP 33: YES), the target combustion amount determination unit 46 determines the target combustion amount of the gas burner 4 to 0, the gas burner 4 is turned off, and the heating operation is stopped. (STEP 36), and the timer 45 stops counting (STEP 37). Then, until it is determined that the room temperature Tr is equal to or lower than the operation resuming temperature Ts (STEP 38: NO), the heating operation is interrupted and the time count of the timer 45 is maintained. When it is determined that the room temperature Tr has become equal to or lower than the operation resumption temperature Ts (STEP 38: YES), the gas burner 4 is ignited (STEP 39), the heating operation is resumed (STEP 40), and the timer 45 is also stopped. Timekeeping is resumed (STEP 41). When the time measured by the timer 45 has elapsed a predetermined time Δt (STEP 42: YES), the save operation setting unit 41 performs a setting for reducing the target temperature Tt by the predetermined temperature ΔT1 (STEP 35). Along with this, the operation interruption temperature Tc and the operation resumption temperature Ts each decrease by a predetermined temperature ΔT1. Thereafter, a heating operation is performed in which the temperature control unit 42 controls the temperature so that the room temperature Tr approaches the lowered new target temperature Tt (STEP 4). As described above, when the eco-operation function is set, the target temperature Tt, the operation interruption temperature Tc, and the operation resumption temperature Ts do not decrease until the room temperature Tr becomes equal to or lower than the operation resumption temperature Ts.

  As shown in FIG. 7, the temperature change when the eco-drive is performed is the same as the temperature change when the save operation and the restraint operation are used together. Therefore, when the heating load is small, such as when the difference between the outside air temperature in spring and the room temperature Tr is small, the heating operation is long even when the temperature operation Tr is stopped after the heating operation is interrupted (STEP 36). Never stop for hours.

  In addition, in the warm air heater B mentioned above, the case where the eco operation switch 33 which can set the eco operation function which unified ON / OFF of the save operation function and the press operation function was demonstrated was demonstrated. However, the switch is not limited to the switch as long as the eco-driving function can be set. For example, the user may operate keys, buttons, dials, touch panels, remote controllers, etc. to set the eco-driving function on / off.

  In the hot air heaters A and B described above, the case where the operation restart temperature Ts is also decreased by the predetermined temperature ΔT1 when the target temperature Tt is decreased by the predetermined temperature ΔT1 has been described. However, the operation resumption temperature Ts is determined by a predetermined correspondence with the target temperature Tt, and it is not always necessary to decrease the same predetermined temperature ΔT1 as the target temperature Tt.

  Further, the case where the save operation setting unit 41 decreases the target temperature Tt by the predetermined temperature ΔT1 every time the predetermined time Δt elapses has been described. However, the predetermined time Δt and the predetermined temperature ΔT1 may be different each time.

  In the case where the restraining operation function or the eco operation function is set, the case where the heating operation is interrupted when the room temperature Tr reaches the operation interruption temperature Tc higher than the target temperature Tt by the predetermined temperature ΔT2 has been described. However, when the room temperature Tr reaches the operation interruption temperature Tc, the heating operation is intermittently operated, or the heating operation interruption or intermittent operation is selected according to the temperature difference from the target temperature Tt of the room temperature Tr. There may be.

  Further, when the save operation function or the eco operation function is set, when the room temperature Tr reaches the operation interruption temperature Tc, the timer 45 stops and keeps time, and then the room temperature Tr becomes equal to or less than the operation resumption temperature Ts. In this case, the case where the holding of the timer 45 is canceled and the time measurement is restarted has been described. However, even when the predetermined time Δt has elapsed since the room temperature Tr reached the target temperature Tt, the target temperature Tt is decreased only by the predetermined temperature ΔT1 only when the room temperature Tr is equal to or lower than the operation restart temperature Ts. Good. In addition, when the room temperature Tr becomes equal to or lower than the operation resumption temperature Ts, and the timer 45 counts the predetermined time Δt, the target temperature Tt is immediately decreased by the predetermined temperature ΔT1 and the timer 45 is reset. Also good.

The whole block diagram of the warm air heater which concerns on embodiment of this invention. The perspective view of an outline of a warm air heater. The partial top view of the operation part of the warm air heater which concerns on 1st Embodiment. The control block diagram of the warm air heater which concerns on 1st Embodiment. The operation | movement flowchart of the warm air heater which concerns on 1st Embodiment. The operation | movement flowchart of the warm air heater which concerns on 1st Embodiment. The graph which shows the temperature change of a warm air heater when saving operation and restraint operation are used together. The graph which shows the temperature change of the conventional warm air heater when saving operation and restraint operation are used together. The graph which shows the temperature change of a warm air heater at the time of a save driving | operation. The graph which shows the temperature change of a warm air heater at the time of a quiet operation. The partial top view of the warm air heater which concerns on 2nd Embodiment. The control block diagram of the warm air heater which concerns on 2nd Embodiment. The operation | movement flowchart of the warm air heater which concerns on 2nd Embodiment. The operation | movement flowchart of the warm air heater which concerns on 2nd Embodiment.

Explanation of symbols

A, B ... Warm air heater, 1 ... Main body case, 2 ... Duct, 3 ... Blower fan, 4 ... Gas burner (heating source), 5 ... Duct, 6 ... Gas supply pipe, 7 ... Control unit, 13 ... Temperature sensor , 14 ... fan motor, 27 ... operation panel, 28 ... operation switch, 29 ... temperature setting switch (setting temperature input means), 30 ... save operation switch (setting input means), 31 ... restraining operation switch (setting input means) 33 ... Eco-operation switch (setting input means), 40 ... Target temperature setting section (target temperature setting means), 41 ... Save operation setting section (save operation setting means), 42 ... Temperature control section, 43 ... Combustion control section 44 ... Air blow control unit, 45 ... Timer, 46 ... Target combustion amount determination unit (heating amount determination means), 47 ... Oshiage operation setting unit (moderation operation setting means).

Claims (3)

A heating source;
A blower fan for sending air heated by the heating source into the room;
A temperature sensor for detecting room temperature;
Set temperature input means for inputting set temperature;
Target temperature setting means for setting the set temperature input to the set temperature input means as the initial target temperature;
A heating amount determining means for determining a heating amount of the heating source so that a detection temperature of the temperature sensor and the target temperature coincide with each other;
Save operation setting means for causing the target temperature setting means to set the target temperature by lowering the predetermined temperature after a predetermined time has elapsed since the detected temperature reached the target temperature;
When the detected temperature is higher than a predetermined temperature than the target temperature, the detected temperature, down to the heating resumed temperature set in advance corresponding to the target temperature, suppressed to limit the amount of heat the heating source Operation setting means,
When the save operation setting means and the restraint operation setting means are on, and the restraint operation setting means limits the heating amount of the heating source, the detected temperature decreases until the detected temperature is lower than the heating restart temperature. The warm air heater is characterized in that the save operation setting means does not cause the target temperature setting means to lower and set the target temperature.   The warm air heater according to claim 1, further comprising setting input means capable of independently setting on / off of the save operation setting means and the restraining operation setting means.   2. The hot air heater according to claim 1, further comprising a single setting input unit capable of commonly setting on / off of the save operation setting unit and the press operation setting unit.

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