JP2016044953A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot air heater which prevents hot air of high temperature against user's will from being delivered.SOLUTION: When starting a heating operation for heating indoors by actuating a gas burner 4 and a heating fan 3, on the basis of an instruction level (α speed) preset by a heating capacity switching switch 27 and detection temperature of a room temperature thermistor 13, an increase instruction level setting unit 41 sets β speed in which instructed heating capacity is increased higher than the instruction level within a predetermined increase limit range. A heating control unit 42 executes initial heating capacity increase processing for actuating the gas burner 4 and the heating fan 3 at the heating capacity of β speed from the start of the heating operation until a predetermined condition is established, and after the predetermined condition is established, it performs a heating operation by actuating the gas burner 4 and the heating fan 3 at the heating capacity of α speed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot air heater that switches a heating capacity in accordance with a user's selection operation.

  Conventionally, there are known hot air heaters (gas fan heaters, oil fan heaters) and the like in which the heating capacity can be switched to a plurality of levels (strong, medium, weak, etc.) according to a user's selection operation. There is also known a hot-air heater that is switched to a low-power operation mode that operates with a reduced heating capacity in accordance with a user's selection operation (see, for example, Patent Document 1).

  According to the hot air heater described in Patent Document 1, by setting the small output operation mode, the user can feel uncomfortable due to overheating, and wasteful use of fuel can be prevented. It can be performed.

  However, if the room where the hot air heater is placed is large or the outside air temperature is low and the low power operation mode is set, the temperature may not rise to the temperature intended by the user due to insufficient heating capacity. is there.

  Therefore, in the hot air heater described in the cited document 1, when heating operation is performed in the small output operation mode, the rising gradient of the room temperature is calculated and compared with a preset reference temperature gradient. When the ascending gradient is smaller than the reference gradient, the heating capacity is increased.

JP-A-6-313621

  According to the hot air heater described in Patent Document 1, when it is assumed that the heating capacity set by the user is insufficient with respect to the situation where the hot air heater is placed, By increasing the capacity, it is possible to prevent the room from becoming a situation where it is difficult to warm up even though the heating operation is started.

  However, when the user desires weaker heating and sets the heating capacity to a lower value, if the heating capacity is increased more than the heating capacity set by the user in this way, the user is more than expected. High-temperature hot air may be sent out, which may cause discomfort to the user.

  This invention is made | formed in view of this background, and it aims at providing the warm air heater which prevented that the hot air of the high temperature contrary to a user's will is sent out.

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;
In response to a user's selection operation, a heating instruction level setting unit that switches and sets the instruction level of the heating capacity by the heating source and the heating fan in a plurality of stages,
A room temperature detector for detecting room temperature;
Based on the instruction level set by the heating instruction level setting unit and the detected temperature of the room temperature detection unit when the heating operation for heating the room by operating the heating source and the heating fan is started. An increase instruction level setting unit for setting an increase instruction level obtained by increasing the heating capacity to be instructed within a predetermined increase limit range from the instruction level;
After the heating operation is started and until the predetermined condition is satisfied, an initial heating capacity increasing process for operating the heating source and the heating fan with the heating capacity corresponding to the increase instruction level is executed, and after the predetermined condition is satisfied Is provided with a heating control unit that operates the heating source and the heating fan with a heating capability according to the instruction level set by the heating instruction level setting unit, and performs a heating operation.

  According to the present invention, when the heating operation is started, the increase instruction level setting unit, based on the instruction level set by the heating instruction level setting unit and the detected temperature of the room temperature detection unit, The increase instruction level in which the instructed heating capacity is increased within the increase limit range is set rather than the instruction level. Then, the heating capacity setting unit executes the initial heating capacity increasing process for operating the heating source and the heating fan with a heating capacity corresponding to the increase instruction level from the start of the heating operation until the predetermined condition is satisfied. To do. In this case, the increase instruction level is set based on the instruction level set by the heating instruction level setting section and the detected temperature of the room temperature detection section, and the increase range of the heating capacity according to the instruction level is set. It is suppressed within the increase limit range. Therefore, the heating capacity of the heating source is not unconditionally increased, and after the predetermined condition is satisfied, the heating capacity by the heating source and the heating fan is set by the heating instruction level setting unit. It depends on the instruction level. Therefore, when the initial heating capacity increasing process is executed at the start of the heating operation to quickly raise the room temperature, the heating operation is executed with a heating capacity that is excessively higher than the instruction level set by the user, and the user This can prevent the user from feeling uncomfortable or uneasy.

Further, the increase instruction level setting unit sets the increase instruction level when the temperature detected by the room temperature detection unit when starting the heating operation is equal to or lower than a predetermined first threshold temperature,
When the increase instruction level is not set, the heating control unit does not perform the initial heating capacity increase process, and the heating source with the heating capacity according to the instruction level set by the heating instruction level setting unit And heating operation is performed by operating the heating fan.

  According to this configuration, since the initial heating capacity increasing process is executed only when the room temperature when the heating operation is started is low, it is possible to further prevent the user from feeling uncomfortable or uneasy. .

  Further, the predetermined condition is set such that a predetermined time elapses from the start of the heating operation.

  According to this configuration, the heating capacity of the heating source and the heating fan is increased at a timing when the temperature of the room is assumed to have increased with the passage of time from the start of the heating operation in which the initial heating capacity increasing process is performed. It is possible to quickly switch to the instruction level set by the user.

  Further, as the predetermined condition, the temperature detected by the room temperature detection unit is set to be equal to or higher than a predetermined second threshold temperature.

  According to this configuration, when it is confirmed that the room temperature has increased to the second threshold value or more by executing the initial heating capacity increasing process, the heating capacity by the heating source and the heating fan is used. It is possible to quickly switch to the instruction level set by the person.

  In addition, the heating capacity control unit sets the initial instruction level so that a temperature of warm air sent into the room by the heating fan is equal to or lower than a predetermined limit temperature.

  According to this configuration, it is possible to quickly increase the room temperature at the start of heating, while suppressing the sending of warm air at a higher temperature that is not intended by the user.

  Further, the increase instruction level setting unit sets the increase instruction level so that the temperature of the hot air sent into the room by the heating fan is equal to or lower than a predetermined limit temperature.

  According to this configuration, it is possible to prevent the heating fan from sending warm air having a temperature higher than that assumed by the user and causing discomfort to the user.

The whole block diagram of a warm air heater (gas fan heater). The block diagram of the controller shown in FIG. The flowchart of the heating operation by a personal mode. Explanatory drawing of the setting map of (beta) speed (increase instruction | indication 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 a room, and a main body case 1 includes a duct 2, a heating fan 3, a gas burner 4 (corresponding to a heating source of the present invention), an air supply duct 5, and a gas supply. A tube 6 and a controller 7 are provided.

  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 looper 11 that adjusts the opening degree of the blower outlet, and a geared motor 12 that drives the movable looper 11 is provided. On the side surface of the duct 2, an overheat prevention thermistor 33 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 blown out into the room as the hot air m from the air outlet 9. 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.

  An operation switch 35 having a built-in lamp 32 (see FIG. 2 to be described later) on the outer surface of the main body case, a mode changeover switch 36 for switching the heating mode between an automatic temperature control mode and a personal mode (a manual setting mode for heating capacity), Heating capacity changeover switch 27 (corresponding to the heating instruction level setting section of the present invention) for automatically setting the heating capacity in the personal mode by switching the instruction level to a plurality of stages (in this embodiment, 5 stages from 1st speed to 5th speed), automatic A room temperature setting switch 28 for setting a target temperature in the temperature control mode, a ventilation lamp 29 for prompting the user to ventilate according to the duration of the heating operation, and a buzzer 31 for notifying the user are provided. .

  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 an increase instruction level setting unit 41, a heating control unit 42, a combustion control unit 43, and a fan control unit 44. Further, data of a β speed setting map 40 described later is held in the memory.

  The controller 7 includes operation signals of the operation switch 35, the mode changeover switch 36, the heating capacity changeover switch 27, and the room temperature setting switch 28, temperature detection signals of the room temperature thermistor 13 and the overheat prevention thermistor 33, and combustion by the thermocouple 20. A state detection signal and a rotation speed detection signal from the rotation speed sensor 16 are 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.

  When the user turns on the operation switch 35 (operation for starting the heating operation), the heating control unit 42 performs the heating operation by executing the processing according to the flowchart of FIG. 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 personal mode is set by the mode switch 36 in STEP1. When the personal mode is set, the process proceeds to STEP2, and when the personal mode is not set (when the automatic temperature control mode is set), the process branches to STEP20.

  STEP20 to STEP22 are heating operation processes in the automatic temperature control mode. In STEP 20, the heating control unit 42 increases the heating capacity in a plurality of stages (first speed (minimum capacity) to 12 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). Switch to (speed (maximum capacity)).

  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. Then, the combustion control unit 43 adjusts the opening degree of the proportional valve 26 to an opening degree corresponding to the target supply amount, and the fan control unit 44 sets the rotation speed detected by the rotation speed sensor 16 to the target rotation speed. Thus, the energization amount 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 STEP12 are heating operation processes in the personal mode. The heating control unit 42 sets the instruction level of the heating capacity (any one of 1st to 5th speeds) selected by the user's selection operation of the heating capacity changeover switch 27 in STEP 2 to the α speed. Then, in STEP 3, the process waits for one minute (stabilization time) from the ignition of the gas burner 4 to proceed to STEP 4, and the room temperature thermistor 13 detects the room temperature T 1.

  In subsequent STEP 5, the heating control unit 42 starts a timer. The next STEP 6 is processing by the increase instruction level setting unit 41. The increase instruction level setting unit 41 applies the α speed and the room temperature T1 to the β speed setting map 40 shown in FIG. 4 and determines whether or not the speed (heating capacity) can be increased.

  The β speed setting map 40 shown in FIG. 4 has an increase width within two stages (corresponding to the increase limit range of the present invention) from the state where the heating operation is performed with the α speed heating capacity at the room temperature T1, and In the range where the temperature of the warm air sent out indoors by the heating fan 3 does not exceed the limit temperature (for example, 60 ° C., which corresponds to the limit temperature of the present invention), the speed capable of increasing the capacity from the α speed is set. It is a map determined as (beta) speed (equivalent to the increase instruction | indication level of this invention).

  The β speed setting map 40 is created by experiment, computer simulation, or the like. Note that the β speed may be determined using a correlation equation that inputs T1 and α speed and outputs β speed instead of a map.

  In the map of FIG. 4, the speed can be increased except when the α speed is 1 to 5 and T1 exceeds 10 ° C. (corresponding to the first threshold temperature of the present invention). For example, when the α speed is 4th and T1 is higher than 0 ° C. and not higher than 10 ° C., the 5th speed is determined as the β speed.

  In STEP 7, the heating control unit 42 switches the heating capacity to β speed (increases the heating capacity) and continues the heating operation. Note that the process of increasing the heating capacity to the β speed and performing the heating operation in this way corresponds to the initial heating capacity increasing process of the present invention.

  In subsequent STEP 8, the heating control unit 42 detects the room temperature T2 by the room temperature thermistor 13, and when the time measured by the timer is 30 minutes or more in STEP 9 (corresponding to the case where the predetermined condition of the present invention is satisfied), or When the room temperature T2-T1 (room temperature rise) is 5 ° C. (corresponding to the second threshold temperature of the present invention) or more (corresponding to when the predetermined condition of the present invention is satisfied), the process proceeds to STEP10.

  In STEP 10, the heating control unit 42 returns the heating capacity to the α speed and continues the heating operation. In subsequent STEP 11, when the user performs an operation of turning off the operation switch (heating operation stop instruction operation), the process proceeds to STEP 12. Then, the combustion of the gas burner 4 is stopped, and when a predetermined time has elapsed since the combustion of the gas burner 4 is stopped, the energization to the fan motor 14 is stopped and the heating operation is ended.

  In this embodiment, in STEP 9 of FIG. 3, the two conditions are (1) when the time counted by the timer is 30 minutes or more, or (2) when the room temperature rise is 5 ° C. or more. However, only one of (1) and (2) may be determined.

  Further, in the present embodiment, the increase range of the heating capacity is within two stages by the β speed setting map of FIG. 4, but may be one stage.

  Further, in the present embodiment, the heating capacity is increased for all levels (1st to 5th speeds) of the heating capacity that can be set in the personal mode by the β speed setting map of FIG. The heating capacity may be increased only when the heating capacity (for example, the third speed or less) is selected.

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

  DESCRIPTION OF SYMBOLS 1 ... Body case of (gas fan heater), 3 ... Heating fan, 4 ... Gas burner (heating source), 7 ... Controller, 13 ... Room temperature thermistor (room temperature detection part), 27 ... Heating capability changeover switch (heating instruction level setting part) ), 41 ... β speed (increase instruction level) setting map, 42 ... heating control unit.

Claims (5)

A heating source for heating the surrounding air;
A heating fan for sending air heated by the heating source into the room;
In response to a user's selection operation, a heating instruction level setting unit that switches and sets the instruction level of the heating capacity by the heating source and the fan in a plurality of stages,
A room temperature detector for detecting room temperature;
Based on the instruction level set by the heating instruction level setting unit and the detected temperature of the room temperature detection unit when the heating operation for heating the room by operating the heating source and the heating fan is started. An increase instruction level setting unit for setting an increase instruction level obtained by increasing the heating capacity to be instructed within a predetermined increase limit range from the instruction level;
After the heating operation is started and until the predetermined condition is satisfied, an initial heating capacity increasing process for operating the heating source and the heating fan with the heating capacity corresponding to the increase instruction level is executed, and after the predetermined condition is satisfied Comprises a heating control unit that operates the heating source and the heating fan with a heating capacity corresponding to the instruction level set by the heating instruction level setting unit, and performs a heating operation. Wind heater. The warm air heater according to claim 1,
The increase instruction level setting unit sets the increase instruction level when the detection temperature of the room temperature detection unit when starting the heating operation is equal to or lower than a predetermined first threshold temperature,
When the increase instruction level is not set, the heating control unit does not perform the initial heating capacity increase process, and the heating source with the heating capacity according to the instruction level set by the heating instruction level setting unit And the warm air heater which operates the said heating fan and performs heating operation. In the warm air heater according to claim 1 or 2,
As the predetermined condition, it is set that a predetermined time elapses from the start of the heating operation. In the warm air heater according to claim 1 or 2,
As the predetermined condition, it is set that the temperature detected by the room temperature detection unit is equal to or higher than a predetermined second threshold temperature. The warm air heater according to any one of claims 1 to 4,
The increase instruction level setting unit sets the increase instruction level so that the temperature of the warm air sent into the room by the heating fan is equal to or lower than a predetermined limit temperature.