JPH10115418A - Combustion volume controller of hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion volume controller of a hot air heater which can be transferred to quiet sound mode arbitrarily and control the amount of gas sophisticatedly from strong combustion to weak combustion during the transfer time of quiet sound mode. SOLUTION: This hot air heater is provided with a control means 44 which controls the amount of combustion of a burner from a maximum combustion volume to a minimum combustion volume in proportion with the deviation between a setting temperature and a detection temperature. In this case, the heater is also provided with a quiet sound switch 24 which indicates and cancels quiet sound operation mode. The control means 44 minimizes the range which changes the amount of combustion when the quiet sound operation mode is indicated with this quiet sound switch 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion amount control device used in an open combustion type gas hot air heater such as a gas fan heater, and more particularly to an improvement in combustion control in a silent operation mode.

[0002]

2. Description of the Related Art As an apparatus having a control means for controlling the amount of combustion of this kind, there is known a noise detection means for detecting noise around combustion equipment as disclosed in Japanese Patent Application Laid-Open No. 5-215406. In order to reduce the noise by adjusting the maximum capacity of a combustion device having a low noise level in accordance with the noise level detected by the method described in Japanese Patent Application Laid-Open No. H11-157572.

[0003]

In the above-described apparatus, in order to reduce the noise by reducing the maximum capacity of the combustion equipment, the maximum combustion amount is automatically reduced according to the noise level detected by the noise detection means. Therefore, it is very convenient, but noise detection means (for example, microphone) is required, there is a problem that costs increase due to the increase in parts, and noise reduction can be achieved only based on the noise level around the combustion equipment. There was a problem that it was not possible to operate in the quiet mode in which the noise was reduced during the time period.

In view of the above circumstances, the present invention provides a combustion amount control device for a warm air heater that can arbitrarily shift to a silent mode and can finely control a gas amount from strong combustion to weak combustion when shifting to the silent mode. The purpose is to:

[0005]

According to a first aspect of the present invention, there is provided a control for controlling a combustion amount in a burner in a range from a maximum combustion amount to a minimum combustion amount according to a deviation between a set temperature and a detected temperature. In the warm air heater provided with the means, a silent switch for instructing and canceling the silent operation mode is provided, and the control means reduces the width of changing the combustion amount when the silent operation mode is instructed by the silent switch. The present invention provides a combustion amount control device for a hot air heater.

According to a second aspect of the present invention, the control means changes the combustion amount by narrowing the maximum combustion amount from the normal maximum combustion amount and making the change width when changing the combustion amount smaller. An object of the present invention is to provide a combustion amount control device for a hot air heater that reduces the width of the heating.

According to a third aspect of the present invention, when the control means instructs a silent operation mode with a silent switch, the temperature for reducing the width of change in the combustion amount after the detected temperature reaches the set temperature. An object of the present invention is to provide a combustion amount control device for a wind heater.

According to a fourth aspect of the present invention, there is provided an apparatus for controlling a combustion amount of a hot air heater in which the number of transitions to the silent operation mode is limited by the control means when the silent operation mode is instructed by the silent switch. To provide.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view showing an embodiment of a hot air heater according to the present invention, FIG. 2 is a side view of the same hot air heater, and FIG. 3 is a schematic diagram showing an operation unit of the hot air heater. Plan view, FIG. 4 is a block circuit diagram schematically showing a control device, FIG. 5 is a flowchart showing an example of combustion amount control,
FIG. 6 is a time chart showing an example of a change in the amount of combustion.

As shown in FIGS. 1 and 2, a warm air heater 1 according to the present invention comprises a base 1A and a casing 2, and a heating space to be described later is provided in a space surrounded by the base 1A and the casing 2. Parts are placed. This casing 2
Constitute a surface other than the bottom surface of the heater 1.

A hot air outlet 3 having a louver directed in a certain direction is provided at a lower portion of the casing 2, an air inlet 4 for introducing fresh room air into the combustion chamber is provided at a back surface, and a rotatable upper portion is provided at an upper portion. A pivotally supported transport handle (ie, handle) 5 is provided. In a space surrounded by the base 1A and the casing 2, a blower 7 that sucks room air from the air suction port 4 and blows the hot air to the hot air outlet 3 through the combustion chamber 6;
A burner 8 and an ignition device 9 housed in the combustion chamber 6; and a gas nozzle 1 arranged outside the combustion chamber and supplying fuel to the burner 8.
0, a proportional valve 11, a main board 14 on which fuel supply means including two solenoid valves 12, 13 and the like are mounted, and auxiliary boards 15 related to operation such as switches and indicator lights corresponding to an operation section described later. Is arranged.

An air filter 16 for preventing dust and dirt from entering the casing 2 such as the combustion chamber 6 and the substrate 14 is detachably attached to the air suction port 4 from the outside of the suction port 4. Although not installed in the present embodiment, fine particles such as smoke that cannot be captured by the air filter 16 are captured in the air passage between the air suction port 4 and the air filter 16 and the indoor air is captured. Some air purifiers include an electrostatic dust collector that cleans and passes air.

Further, on the upper surface of the casing 2, there is provided an operation panel 17 having an operation section and a display section as schematically shown in FIG. The operation unit of the operation panel 17 includes an operation switch 21 for instructing start and stop of the heating operation, a so-called sleep switch 22 for instructing start and stop of so-called sleep operation for stopping the heating operation at a desired time, and a heating operation. Good morning switch 23 for instructing the start and stop of the so-called good morning operation to be started at a desired time, and a silent switch for instructing start and stop of the silent operation mode during the heating operation (in other words, instructing and canceling the silent operation mode). 24 and an up switch 2 for instructing and setting a desired room temperature (that is, a set temperature) and strong combustion or weak combustion.
5, a temperature setting means 27 including a down switch 26;
There is a time setting means 30 including an up switch 28 and a down switch 29 for setting the time.

As a display section of the operation panel 17, FIG. 4 arranged below the operation switch 21 and the silent switch 24.
And a sleep lamp 42 provided on the sleep switch 22.
A good morning operation lamp 32 provided on the good morning switch 23, and a seven-segment for alphanumeric display which changes its display content by various switch operations of the operation unit and also serves as a time display unit and a temperature display unit. An indicator light 33 in which four indicator lights are arranged side by side, and an am lamp 34 and an afternoon lamp 3 arranged vertically next to the left of the indicator light 33
There are five.

In FIG. 4, reference numeral 40 denotes a control device for controlling the combustion operation of the hot air heater 1, 43 denotes a temperature sensor for detecting the present room temperature, and 44 denotes at least the operation switch 21, the silent switch 24, and the temperature on the input side. A microcomputer (hereinafter, referred to as a microcomputer) as operation control means to which the setting means 27 and the temperature sensor 43 are connected and at least the temperature display unit 33, the operation lamp 41, and the silent lamp 42 are connected to the output side.

The burner 8 and the burner 8 are controlled under various conditions designated by various switches arranged on the operation panel 17.
In addition to controlling the operation of the fuel supply means mainly including the ignition device 9 and the proportional valve 11, the blower 7 is started, and the air that has passed through the air filter 16 is sucked into the casing 2 through the air suction port 4, and After the part flows into the combustion chamber 6 and is heated by the combustion heat of the burner 8, it is sent into the room from the hot air outlet 3, while the remaining part of the air introduced into the casing 2 flows around the combustion chamber 6. It is also heated while being cooled and is sent into the room from the hot air outlet 3. The room is heated by the warm air sent into the room from the hot air outlet 3.

However, the microcomputer 44 includes the temperature setting means 2
When a desired room temperature (for example, 20 ° C.) is set in step 7, the amount of combustion (ie, gas supply by the fuel supply unit) is determined based on the difference between the set temperature set by the setting unit 27 and the temperature detected by the temperature sensor 43. The amount and the number of rotations of the blower 7) are appropriately adjusted within a range from the maximum combustion amount to the minimum combustion amount, and the operation is performed in an automatic operation mode in which the room temperature is maintained at the set temperature. On the other hand, the temperature setting means 27 performs strong combustion (“H” display on the display unit) or weak combustion (“H” on the display unit).
When "L" display) is set, it has a function of operating in the continuous operation mode in which the combustion amount is fixed to "strong" or "weak" regardless of the room temperature.

The microcomputer 44 further includes an operation switch 2
When the silent switch 24 is operated after the operation 1, the silent operation mode is determined to have been instructed, and immediately after that (see FIG. 5) or after the room temperature is raised to the set temperature in the normal operation, the normal heating operation is performed. It has a function to shift to a silent operation mode in which the width of change in the combustion amount is smaller than during operation (that is, the normal mode).

Here, reducing the width of change in the amount of combustion means (a) narrowing (decreasing) the maximum amount of combustion from the normal maximum amount of combustion, and (b) one stage when changing the amount of combustion. This includes both reducing the change width of the minute. In particular, in this embodiment, the maximum combustion amount (H) in the normal heating mode = strong combustion = 100% = 10 steps,
The minimum combustion amount (L) = weak combustion = 1 step, and the combustion amount can be controlled in 10 steps from this 1 step to 10 steps. Further, the maximum combustion amount (SH) in the silent operation mode = 70% = 10 steps,
The minimum combustion amount (L) = weak combustion = 1 step, and the range up to 70% (70% of the normal mode) can be controlled in 10 steps (that is, 1 step in the silent operation mode). The variation width of the steps is also narrowed to 70% of that in the normal mode.
reference).

Next, a control operation of the operation control means 44 will be described based on a flowchart showing an example of the combustion amount control of FIG. First, at step S1, the operation switch 21 is turned on.
("ON") When operated, the proportional valve 11 is turned on at "strong" in step S2, the blower (convection fan) 7 is turned on at "weak" in step S3, and the solenoid valve 12 is turned on in step S4. The ignition device (igniter) 9 is turned on in step S5, the solenoid valve 13 is turned on in step S6, the proportional valve 11 is dropped to "medium" in step S7, and the ON operation is performed. In step S8, combustion is started. Is detected, the operation lamp 41 is turned on, and the ignition device 9 is turned off in step S9.

In step S10, the proportional valve 11 is turned on again at "strong", and the blower 7 is turned on at "strong". That is, after ignition, the heating mode is entered in a strong combustion state.
Go to step 12.

Subsequently, in step S12, it is determined whether or not the silent switch 24 has been turned on ("on"). If the silent switch 24 has not been turned on, the process proceeds to step S13.
Then, the process proceeds to the normal heating mode in step S14, and if the silent switch 24 is turned on, the process proceeds to the silent operation mode in steps S15 and S16.

In step S13, the combustion amount in the temperature control proportional control (ie, the automatic operation mode) is increased to a strong combustion (H = 100).
%) And weak combustion (L), the combustion amount is controlled in a range (normal range), and in step S14, an operation is performed in which the normal range is divided into 10 steps to change the combustion amount.

Further, in step S15, the amount of combustion in the temperature control proportional control (ie, the automatic operation mode) is reduced to 70 for the strong combustion.
% (SH) and the combustion amount is controlled within the range of the combustion amount (silent range) between the weak combustion (L), and in step S16, the operation is performed in which the combustion amount is changed by dividing the silent range into 10 steps. .

As described above, the amount of change in the amount of combustion when the silent switch 24 is instructed by the silent switch 24 is reduced, so that the amount of combustion in the silent operation mode can be changed more precisely than in the normal heating operation mode. It can control the operation noise caused by the change in combustion amount.
4 dB could be reduced from 6 dB to 32 dB.

Further, the maximum combustion amount (SH) in the silent operation mode is reduced (smaller) than the normal combustion amount (H).
In this way, the maximum operating noise during the silent mode is suppressed by 4 dB as compared with the normal operation, and the change width when the combustion amount is changed is also made smaller than the normal operation. The number of stages can be made the same as in the normal mode, and the control characteristics can be improved compared to the normal mode.

In the above, when the silent switch 24 is operated, when the microcomputer 44 determines that it has been operated, the microcomputer 44 immediately shifts to the silent operation mode. However, the present invention is not limited to this example. As an example, after determining the operation of the silent switch, the combustion amount is controlled in the normal operation mode until the room temperature detected by the temperature sensor 43 reaches the set temperature set by the temperature setting means 27. The mode may be shifted to, or as a third embodiment, the mode may be shifted to the silent operation mode a fixed time (for example, 5 minutes) after the room temperature reaches the set temperature. In this case, since the mode is shifted to the silent operation mode in which the width of changing the combustion amount is reduced after the room temperature reaches the set temperature, the room temperature rising speed after the mode change instruction can be made the same as normal, Temperature control accuracy after reaching the set temperature can be performed more precisely than in the normal operation mode.

Further, an example is shown in which the number of transitions to the silent operation mode is not particularly limited when the silent switch 24 is pressed, but the number of transitions to the silent operation mode by operating the silent switch (for example, once or two times). May be limited. In particular, if it is limited to one time, when the operation stop is instructed and the operation is again instructed during the silent operation mode, the number of times of the silent operation mode is exceeded at that point and the operation does not shift to the silent operation mode again. Even if the silent switch 24 is forgotten to be turned off, when the operation switch 21 is turned on again, it can be automatically returned to the normal operation mode, and the usability as a heater is improved.

[0029]

As described above, according to the first aspect of the present invention, when the silent operation mode is instructed by the silent switch, the width of changing the combustion amount is reduced, so that the combustion amount during the silent operation mode is reduced. Change control can be performed more precisely than in the normal heating operation mode, and operation noise accompanying a change in combustion amount can be reduced.

According to the second aspect of the present invention, the maximum operation amount in the silent operation mode is reduced more than the normal operation amount, thereby suppressing the maximum operation sound in the silent operation mode more than the normal operation amount, and changing the combustion amount. By making the width of change at the time of making smaller than usual, precise combustion amount control can be performed, and in addition, the number of stages of change can be made the same or different from that at normal time, and control characteristics can be improved.

According to the third aspect of the invention, when the silent operation mode is instructed by the silent switch, the mode is shifted to the silent operation mode in which the width of changing the combustion amount is reduced after the room temperature reaches the set temperature. Thus, the speed of the room temperature rise after the mode change instruction can be made the same as in the normal operation mode, while the temperature control accuracy after reaching the set temperature is finer and improved than in the normal operation mode. For example, by setting a limit on the number of transitions to the silent operation mode by operating the silent switch, if the operation stop is instructed and the operation is again instructed during the silent operation mode, the number of times of the silent operation mode is limited at that time. If it is over, the mode does not shift to the silent operation mode, so that even if the silent switch is forgotten to be turned off, it is possible to automatically return to the normal operation mode.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a hot air heater according to an embodiment of the present invention.

FIG. 2 is a side view of a partially cut-away state showing one embodiment of the hot air heater.

FIG. 3 is a schematic plan view showing an operation unit of the hot air heater.

FIG. 4 is a block circuit diagram schematically showing a control device.

FIG. 5 is a flowchart illustrating an example of combustion amount control.

FIG. 6 is a time chart showing one example of a change in the amount of combustion. FIG.

[Description of Signs] 1... Hot air heater 15... Auxiliary board 17... Operation panel 21... Operation switch 24... ... Control device 42 ... Silent lamp 43 ... Temperature sensor 44 ... Microcomputer (operation control means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Morishima 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Norio Osawa 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A silent air operating mode in a hot air heater having a control means for controlling a combustion amount in a burner in a range from a maximum combustion amount to a minimum combustion amount according to a deviation between a set temperature and a detected temperature. Equipped with a silent switch to instruct and release
The control means reduces the width of change in the combustion amount when the silent operation mode is instructed by the silent switch. 2. The control means according to claim 1, wherein the maximum combustion amount is narrowed down from the normal maximum combustion amount, and the width of change in the combustion amount is reduced by reducing the change width when changing the combustion amount. The combustion amount control device for a hot air heater according to claim 1, wherein: 3. The control device according to claim 1, wherein when a silent operation mode is instructed by a silent switch, a width of changing a combustion amount after the detected temperature reaches a set temperature is reduced. A combustion amount control device for a hot air heater according to claim 1. 4. The combustion of a warm air heater according to claim 1, wherein the control means limits the number of transitions to the silent operation mode when the silent operation mode is instructed by the silent switch. Quantity control device.