JP2016080292A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot air heater preventing comfort of heating from losing in execution of heating operation in an operation mode of restricting heating capacity.SOLUTION: A mode changeover switch 36 switches between a normal operation mode in which an upper limit of heating capacity is a normal upper limit level and a restriction operation mode in which the upper limit of the heating capacity is a restriction upper limit level lower than the normal upper limit level. A restriction upper limit level setting unit sets the restriction upper limit level higher as a detection temperature of a room temperature thermistor 13 is lower. A heating control unit performs heating operation within a range where the heating capacity is equal to or less than the restriction upper limit level so that the detection temperature of the room temperature thermistor 13 is a temperature set by a room temperature setting switch, in the restriction operation mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot air heater that switches a heating capacity in accordance with a room temperature.

  2. Description of the Related Art Conventionally, there is known a hot air heater that performs heating operation by changing the heating capacity so that the room temperature detected by the temperature sensor becomes a set temperature (see, for example, Patent Document 1).

  The hot-air heater described in Patent Document 1 has a heating operation mode, a normal operation mode, and a limited operation mode in which the upper limit of the set temperature and the heating capacity is limited lower than that of the normal operation by a user's selection operation (safety mode). (Operation mode, child lock mode). In the limited operation mode, the upper limit of the set temperature and the heating capacity is limited to be lower than that in the normal operation mode, thereby suppressing the temperature rise of the hot air heater main body and enabling the operation with improved safety. Yes.

JP 2004-309071 A

  According to the hot air heater described in Patent Document 1, when the limited operation mode is selected and the upper limit of the set temperature and the heating capacity is limited to be low, when the room temperature is low, the temperature rises. When the heating operation is started more than necessary, the room temperature does not easily rise, and the comfort of heating may be impaired.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a warm air heater that suppresses the deterioration of the comfort of heating when performing the heating operation in the operation mode in which the heating capacity is limited. To do.

The present invention has been made to achieve the above object, and the hot air heater according to the present invention includes:
A heating source for heating the surrounding air;
A heating fan for sending air heated by the heating source into the room;
According to the user's selection operation, the heating operation mode by the heating source and the fan, the normal operation mode in which the upper limit of the heating capacity is the normal upper limit level, and the upper limit of the heating capacity is lower than the normal upper limit level An operation mode switching unit for switching to a restricted operation mode to be a restriction upper limit level;
A room temperature detector for detecting room temperature;
A lower limit detection level setting unit that sets the upper limit limit level higher as the detection temperature of the room temperature detection unit is lower;
In the normal operation mode, the heating capacity is set to a range below the normal upper limit level, and in the limited operation mode, the heating capacity is set to be equal to or lower than the limit upper limit level so that the detection temperature of the room temperature detection unit becomes a predetermined set temperature. The range includes a heating control unit that performs heating operation.

  According to the present invention, the limit upper limit level that is the upper limit level of the heating capacity in the limit mode is set higher by the limit upper limit level setting unit as the detected temperature of the room temperature detection unit is lower. And in the said restriction | limiting mode, heating operation is performed by the said heating control part as the range below the said restriction | limiting upper limit level so that heating temperature may become the preset temperature so that the detection temperature of the said room temperature detection part may become the said setting temperature.

  As a result, in a situation where the room temperature is low and the temperature of the air heated by the heating source is difficult to increase even if the heating capacity is increased, the limit upper limit level is set high, so The room temperature can be quickly raised while preventing the wind from becoming high temperature. Therefore, it is possible to prevent the comfort of heating from being impaired when the heating operation is performed in the capacity restriction mode.

In addition, a hot air-linked temperature detection unit in which the detected temperature changes according to the temperature of the hot air sent into the room by the heating fan,
The restriction upper limit level setting unit sets the restriction upper limit level higher as the detected temperature of the hot air interlocking temperature detection unit is lower.

  According to this configuration, since the limit upper limit level can be set in consideration of the actual temperature of the hot air sent into the room, high-temperature hot air is generated even though the limit mode is set. It is possible to prevent the user from feeling uncomfortable by being sent out indoors.

In addition, an air flow passage that guides indoor air taken in from an air inlet provided with an air filter to the hot air outlet through the heating source by the operation of the heating fan,
The hot air interlocking temperature detection unit is a temperature sensor provided between the heating source of the air flow passage and the outlet in order to detect blockage of the air filter.

  According to this configuration, when the air filter is blocked, the air flow in the air flow passage is hindered and the temperature detected by the temperature sensor is increased. Therefore, blockage of the air filter can be detected based on the temperature detected by the temperature sensor. Further, since the air heated by the heating source flows through the air flow passage and is sent out indoors from the outlet, it is sent out indoors by the fan as the temperature detected by the temperature sensor increases. The temperature of the hot air also increases.

  Therefore, the temperature sensor can be used as the hot air-linked temperature detection unit, and in this case, it is not necessary to newly provide the hot air-linked temperature detection unit, so the configuration of the hot air heater is simplified. Can be

The whole block diagram of a warm air heater (gas fan heater). The block diagram of the controller shown in FIG. The flowchart of heating operation. Explanatory drawing of the setting map of a restriction | limiting upper limit level.

  An embodiment of a gas fan heater which is a hot air heater of the present invention will be described with reference to FIGS.

  The gas fan heater shown in FIG. 1 heats the room, and includes a duct 2 (corresponding to an air flow passage of the present invention), a heating fan 3, and a gas burner 4 (a heating source of the present invention) in a main body case 1. The air supply duct 5, the gas supply pipe 6, and the controller 7.

  The duct 2 constitutes a hot air blowing path, and an intake port 8 for taking in indoor air is opened at the back of the main body case 1, and a hot air outlet 9 is opened at the lower front of the main body case 1. . The blower outlet 9 is provided with a movable louver 11 that adjusts the opening degree of the blower outlet, and a geared motor 12 that drives the movable louver 11 is provided. On the side surface of the duct 2, an overheat prevention thermistor 33 (corresponding to the hot air interlocking temperature detection unit and the temperature sensor of the present invention) for detecting overheating in the duct 2 is provided.

  The heating fan 3 has a fan motor 14 and a rotary blade 15 that is arranged facing the blower outlet and is driven to rotate by the fan motor 14. The room air is passed from the air inlet 8 into the duct 2 by the rotation of the rotary blade 15. Aspirate s. Then, the air-fuel mixture of the sucked indoor air s and the combustion exhaust h of the gas burner 4 is guided to the air outlet 9 as hot air m and blown out into the room. The heating fan 3 is provided with a rotation speed sensor 16 that detects the rotation speed of the fan motor 14.

  An ignition electrode 19 for igniting the gas burner 4 and a thermocouple 20 for detecting the combustion state of the gas burner 4 are arranged on the downstream side of the combustion plate 18 of the gas burner 4. It is discharged from the trunk 17 into the duct 2.

  The air supply duct 5 is a passage for supplying combustion air and fuel gas to the gas burner 4, and includes an intake port 21 that is opened on the back surface of the main body case 1. A nozzle 22 attached to the tip of the gas supply pipe 6 is provided at a location on the gas burner 4 side of the air supply duct 5, and the fuel gas ejected from the nozzle 22 is supplied to the intake port 21 by the operation of the heating fan 3. Is mixed with the combustion air sucked from the gas and supplied to the gas burner 4. The air supply duct 5 is provided with a room temperature thermistor 13 (corresponding to a room temperature detector of the present invention) that detects the temperature of the indoor air sucked from the air inlet 21.

  The air inlet 21 of the air supply duct 5 is covered with the air filter 10 together with the air inlet 8 of the duct 2.

  In the gas supply pipe 6, electromagnetic valves 24 and 25 and a proportional valve 26 are sequentially arranged from the upstream side. The solenoid valves 24 and 25 are opened when a drive coil (not shown) is energized, and are closed when not energized (when energization is interrupted). The proportional valve 26 has an opening that changes according to the magnitude of the energization current.

  On the outer surface of the main body case, there are an operation switch 35 with a built-in lamp 32 (see FIG. 2 described later), a mode switch 36 for switching the heating mode between the normal operation mode and the limited operation mode (in the operation mode switching unit of the present invention). A room temperature setting switch 28 for setting a target temperature in the heating operation, a ventilation lamp 29 for prompting the user to ventilate according to the duration of the heating operation, and a buzzer 31 for informing the user It has been.

  Next, referring to FIG. 2, the controller 7 is an electronic circuit unit constituted by a CPU, a memory, an input / output interface, etc. (not shown), and the CPU executes a control program for the gas fan heater held in the memory. By doing so, it functions as a limit upper limit level setting unit 41, a heating control unit 42, a combustion control unit 43, a fan control unit 44, and a blockage detection unit 45. The memory holds data of a limit upper limit level determination map 40 described later.

  The controller 7 includes operation signals of the operation switch 35, the mode changeover switch 36, and the room temperature setting switch 28, temperature detection signals of the room temperature thermistor 13 and the overheat prevention thermistor 33, and a combustion state detection signal by the thermocouple 20. A rotation speed detection signal from the rotation speed sensor 16 is input.

  Further, the operation of the geared motor 12, the fan motor 14, the ignition electrode 19, the electromagnetic valves 24 and 25, the proportional valve 26, the ventilation lamp 29, the buzzer 31, and the operation switch built-in lamp 32 is controlled by a control signal output from the controller 7. Is done.

  The heating control unit 42 executes the processing according to the flowchart of FIG. 3 when the user performs an ON operation of the operation switch 35 (heating operation start operation), and performs the heating operation in the normal operation mode or the limited operation mode. Do.

  The heating control unit 42 performs the heating operation by switching the heating capacity of the gas burner 4 and the heating fan 3 to a plurality of stages (first speed (minimum capacity) to 12th speed (maximum capacity)). In the normal operation mode, the heating capacity is switched to the 12th speed (corresponding to the normal upper limit level of the present invention), and in the limited operation mode, the heating capacity is below the upper limit limit set by the upper limit limit setting unit 41. The heating capacity can be switched within the range.

  The blockage detection unit 45 alerts the buzzer 31 that the air filter 10 is blocked (clogged) when the detected temperature of the overheat prevention thermistor 33 is equal to or higher than a preset overheat determination temperature. The user is notified by sound output and lighting of the ventilation lamp 29 to prompt the user to clean the air filter 10.

  Hereinafter, according to the flowchart shown in FIG. 3, the execution process of heating operation is demonstrated.

  The heating control unit 42 determines whether or not the limited operation mode is selected by the mode changeover switch 36 in STEP1. The process proceeds to STEP 2 when the limited operation mode is selected, and branches to STEP 20 when the limited operation mode is not selected (when the normal operation mode is selected).

  STEP20 to STEP22 are heating operation processes in the normal operation mode. The heating control unit 42 sets the heating capacity to 12 speeds so as to reduce the difference between the temperature detected by the room temperature thermistor 13 and the temperature set by the room temperature setting switch 28 (corresponding to the predetermined set temperature of the present invention). And set as the upper limit. The combustion control unit 43 determines a target combustion amount of the gas burner 4 at which the heating capacity set by the heating control unit 42 is obtained, and a target supply amount of fuel gas to the gas burner 4 according to the target combustion amount and the heating fan 3 Determine the target rotational speed.

  And the combustion control part 43 adjusts the opening degree of the proportional valve 26 to the opening degree according to the target supply amount, and the fan control part 44 makes the rotational speed detected by the rotational speed sensor 16 become a target rotational speed. In addition, the amount of current supplied to the fan motor 14 is adjusted.

  In subsequent STEP 21, the heating control unit 42 determines whether or not the operation switch 35 is turned off (heating completion operation) by the user. Then, when the operation switch 35 is turned off, the process proceeds to STEP 22, where the combustion control unit 43 stops the combustion of the gas burner 4, and energizes the fan motor 14 when a predetermined time elapses after the combustion stop of the gas burner 4. Stop and end the heating operation. On the other hand, when the operation switch 35 is not turned off, the process returns to STEP 1 and the heating control unit 42 continues the heating operation.

  Next, STEP2 to STEP8 are heating operation processes in the limited operation mode. The heating control unit 42 waits for one minute (stable time) to elapse from the time of ignition of the gas burner 4 in STEP 2, proceeds to STEP 3, and detects the room temperature Tr by the room temperature thermistor 13.

  In subsequent STEP 4, the heating control unit 42 detects the temperature Th in the duct 2 by the overheat prevention thermistor 33. Here, as described above, the combustion exhaust h of the gas burner 4 and the air s sucked from the intake port 8 are mixed and distributed through the duct 2 and sent out from the outlet 9 into the room.

  Therefore, when the filter 10 is clogged, the air flow in the air flow passage is hindered, and the temperature detected by the overheat prevention thermistor 33 according to the temperature of the warm air sent from the air outlet to the room by the heating fan 3. Changes, and the higher the temperature detected by the overheat prevention thermistor 33, the higher the temperature of the hot air sent from the air outlet 9 into the room.

  Therefore, in the next STEP 5, the limit upper limit level setting unit 41 applies the detected temperature Tr of the room temperature thermistor 13 and the detected temperature Th of the overheat prevention thermistor 33 to the limit upper limit level determination map 40 shown in FIG. Set the upper limit level.

  The limit upper limit level determination map 40 shown in FIG. 4 shows the upper limit of the heating capacity so that the temperature of the warm air sent from the outlet 9 becomes a predetermined temperature or less when the heating operation is performed under the room temperature Tr. It is a map that determines the level. The limit upper limit level determination map 40 is created by experiment or computer simulation. Note that the limit upper limit level may be determined using a correlation equation that inputs Tr and Th and outputs the control upper limit level instead of the map.

  In the map of FIG. 4, the limit upper limit level determined is higher as the detection temperature Tr of the room temperature thermistor 13 is lower, and the limit upper limit level determined is lower as the detection temperature Th of the overheat prevention thermistor 33 is lower. Is getting higher. In subsequent STEP 6, the heating control unit 42 performs the heating operation by the limit temperature control that switches the heating capacity within the range of the limit upper limit level or less.

  In the limit temperature adjustment mode, the heating control unit 42 sets the heating capacity to the limit upper limit set in STEP 5 so as to reduce the difference between the temperature detected by the room temperature thermistor 13 and the temperature set by the room temperature setting switch 28. Change the setting within the range below the level. Thereby, heating temperature can be increased moderately and room temperature can be raised rapidly, preventing the temperature of the warm air sent from the blower outlet 9 from becoming high temperature.

  In subsequent STEP 7, when the operation switch is turned off by the user (heating operation stop instruction operation), the process proceeds to STEP 8 to stop the combustion of the gas burner 4, and when a predetermined time has elapsed from the stop of the combustion of the gas burner 4, the fan The energization to the motor 14 is stopped and the heating operation is terminated.

  In the present embodiment, the limit upper limit level of the heating capacity is set based on the detected temperature Tr of the room temperature thermistor 13 and the detected temperature Th of the overheat prevention thermistor 33 by the limit upper limit level setting map shown in FIG. However, the limit upper limit level may be set based only on the detected temperature Tr of the room temperature thermistor 13.

  In the present embodiment, the overheat prevention thermistor 33 provided for detecting the blockage of the air filter 10 is used as the hot air-linked temperature detection unit of the present invention. It may be provided. In this case, the hot air interlocking temperature detection unit may be provided at a location where it can detect a temperature that changes in conjunction with the temperature of the hot air sent from the air outlet 9 into the room.

  Moreover, in this embodiment, although the hot air heater which uses a gas burner as a heating source was shown as a warm air heater of this invention, it is a hot air heater using other types of heat sources, such as a kerosene burner and an electric heater. Also, the present invention can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Main body case (of a gas fan heater), 2 ... Duct (air flow passage), 3 ... Heating fan, 4 ... Gas burner (heating source), 7 ... Controller, 9 ... Air outlet, 13 ... Room temperature thermistor (room temperature detection part) ), 33... Thermistor for preventing overheating (warm air linked temperature detection unit), 36... Mode changeover switch (operation mode switching unit), 40... Upper limit level determination map, 41. , 43 ... Combustion control unit, 45 ... Blockage detection unit.

Claims (3)

A heating source for heating the surrounding air;
A heating fan for sending air heated by the heating source into the room;
According to the user's selection operation, the heating operation mode by the heating source and the fan, the normal operation mode in which the upper limit of the heating capacity is the normal upper limit level, and the upper limit of the heating capacity is lower than the normal upper limit level An operation mode switching unit for switching to a restricted operation mode to be a restriction upper limit level;
A room temperature detector for detecting room temperature;
A lower limit detection level setting unit that sets the upper limit limit level higher as the detection temperature of the room temperature detection unit is lower;
In the normal operation mode, the heating capacity is set to a range below the normal upper limit level, and in the limited operation mode, the heating capacity is set to be equal to or lower than the limit upper limit level so that the detection temperature of the room temperature detection unit becomes a predetermined set temperature. A warm air heater comprising a heating control unit that performs heating operation as a range. The warm air heater according to claim 1,
According to the temperature of the hot air sent out indoors by the heating fan, a hot air interlocking temperature detection unit that changes the detected temperature,
The said limitation upper limit level setting part sets the said limitation upper limit level so that the detection temperature of the said warm air interlocking temperature detection part is low, The warm air heater characterized by the above-mentioned. The warm air heater according to claim 2,
By the operation of the heating fan, an air flow passage that guides indoor air taken in from an intake port equipped with an air filter to a hot air outlet through the heating source,
The hot air interlocking temperature detection unit is a temperature sensor provided between the heating source of the air flow passage and the outlet in order to detect blockage of the air filter. heater.

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