JP5592240B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater such as a gas fan heater or an oil fan heater that is movably installed indoors.

  FIG. 3 is a schematic front view showing an internal structure of a general gas fan heater. A hot air generator (102) in which a gas burner and a blower fan (121) are disposed in a casing (104), and FIG. A control chamber in which a control board (130) having a control circuit for controlling various operations of the hot air generator (102) and a valve unit (122) interposed in the gas supply pipe (142) is disposed. (120).

  In this type of hot air heater, in general, when the hot air heater is overturned due to an earthquake or the like, operation of the hot air generator (102) is prohibited, so it falls as a safety device that detects the inclination of the casing (104). A switch (101) is provided on the control board (130).

  As the fall switch (101), a mechanical contact type has been widely used. The structure of the fall switch (101) will be described with reference to FIG. 4. The fall switch (101) has a bottomed cylindrical shape. A spherical body (111) made of conductive metal or alloy is contained in a sealed container having a metal housing (110) and a metal circular lid (112) that closes the opening of the housing (110). In addition, a conductive lead pin (133) is hermetically insulated and fixed to the lid plate (112) by an electrically insulating filler (113) such as glass. A plurality of contact plates (132) made of a conductive material are arranged substantially concentrically around the tip of the lead pin (133) on the lower end side of the lead pin (133).

  The operation of the overturn switch (101) will be described.The sphere (111) is fitted in a recess (110a) provided in the center of the bottom surface of the housing (110) when stationary, and in this state the sphere (111 ) Is not in contact with the contact plate (132), and therefore no electric circuit is formed between the lead pin (133) and the lid (112).

  On the other hand, when the casing (104) tilts due to an earthquake or an external impact on the casing (104), the sphere (111) jumps out of the recess (110a) and rolls in the housing (110), and contacts ( 132). As a result, the contact plate (132) and the housing (110) are electrically short-circuited, and the path of the lead pin (133) -contact plate (132) -sphere (111) -housing (110) -lid plate (112) is used. An electric circuit is formed, and a signal is output to the control circuit via the lug terminal (114), and the control circuit prohibits the operation of the hot air generator.

JP-A-5-215405

JP 2001-165761 A

JP 2003-279582 A

JP-A-8-273504

  By the way, in the hot air heater, for operation confirmation and safety confirmation, an alarm device such as a piezoelectric buzzer (such as a piezoelectric buzzer) is generated so that a notification sound is generated when the user operates the input switch or when there is an abnormality such as lack of oxygen. 131) may be provided. Such an alarm (131) is often installed on the same control board (130) as the overturn switch (101) in consideration of the ease of wiring, as shown in FIG.

  However, when the fall switch (101) and the alarm (131) are provided on the same control board (130), the vibration of the alarm (131) is caused by the housing (110 of the fall switch (101). ). Therefore, in the mechanical contact type inversion switch (101) in which the sphere (111) is accommodated in a free state, the sphere (111) may hit the peripheral surface of the recess (110a) due to vibration of the housing (110). As a result, although the casing (104) is not tilted, a malfunction that prohibits the operation of the hot air device occurs, or the alarm sound is mixed with the vibration sound from the overturn switch (101) as noise. There are problems that the timbre is not stable or that the alarm (131) is suspected to be faulty.

The present invention has been made in view of the above circumstances, and an object of the present invention is to control the fall switch for prohibiting operation at the time of fall and the alarm for notifying operation sound when operating the input switch and the like. A hot air heater provided on a substrate ,
Inside the casing where the power cord is extended, a hot air generator, and a control board having a control circuit for controlling the operation of the hot air generator,
An acceleration sensor that detects the inclination of the casing, and a notification device that informs by sound that artificial operations such as ignition / extinguishing and temperature adjustment have been performed with various operation switches,
In the hot air heater having a control configuration for prohibiting the operation of the hot air generator when the inclination of the casing detected by the acceleration sensor is equal to or greater than a predetermined angle, the control circuit reliably tilts the housing. An object of the present invention is to provide a hot-air heater that can detect a notification sound without noise from an alarm.

In the present invention, the acceleration sensor also detects the moving direction of the casing,
The control board has the acceleration sensor and the alarm on the same plane,
The said control circuit is a warm air heater which has a control structure which prohibits the driving | operation of the said warm air generator, when it determines with the impact with which the said casing is pulled in the direction opposite to the said movement direction.

The acceleration sensor can detect the movement of an object and vibration such as an earthquake, as well as the inclination angle and the moving direction . For this reason, if the acceleration sensor is used as a fall switch and the operation of the hot air generator is controlled by detecting the inclination and moving direction of the casing , the fall switch and the alarm are provided on the same control board. In addition, it is possible to reliably detect the inclination and the moving direction of the casing. And since the said acceleration sensor is not the structure where the spherical body was movably accommodated in the housing like the conventional mechanical contact type fall switch, the fall switch via the control board by the generation of the alarm sound from the alarm Even if vibration is transmitted to the acceleration sensor, no vibration sound is generated from the acceleration sensor itself.

As fall switch such warm air heater as such as a gas fan heater, by employing an acceleration sensor, also fall switch and alarm are provided in the same control substrate, Ya inclination of the casing caused by an earthquake or the like It is possible to reliably detect the moving direction and prohibit the operation of the hot air generator. Further, even if the overturn switch and the alarm are provided on the same control board, no vibration noise is generated from the overturn switch. As a result, vibration sound is not mixed as noise with the notification sound, and the notification sound can always be generated with a stable tone, and the trouble of the speaker of the alarm device is suspected due to the mixing of vibration sound. Can be prevented.

It is a schematic front view which shows the inside of the warm air heater of embodiment of this invention. It is a flowchart figure which shows operation | movement of the warm air heater of embodiment of this invention. It is a schematic front view which shows the inside of the conventional warm air heater. It is sectional drawing of the fall switch employ | adopted as the conventional warm air heater.

Hereinafter, a hot air heater constituting an embodiment of the present invention will be described with reference to the drawings, taking a gas fan heater as an example.
FIG. 1 is a schematic front view showing the inside of the hot air heater with the front panel removed, and the rectangular casing (4) of the gas fan heater covers the front side and has a blower outlet formed in the lower part. And a back panel (43) covering the back side. On the upper surface of the casing (4), there is provided a display operation section (44) comprising operation switches for ignition / extinguishing operation and adjustment of set temperature, and a liquid crystal display section for displaying set temperature, timer, etc. . Although not shown, a power cord and a gas hose extend from the casing (4).

  In the casing (4), a hot air generator (2) containing a gas burner (23) and a blower fan (21) is installed, and is placed in a control chamber (20) on the side of the hot air generator (2). Is provided with a valve unit (22) interposed in the gas supply pipe (42).

  The mixing pipe part (41) of the gas burner (23) is exposed on the side wall (24) of the hot air generator (2) on the control chamber (20) side, and the inlet is provided at the tip of the mixing pipe part (41) (40) is provided. A downstream end of a gas supply pipe (42) for supplying fuel gas to the gas burner (23) is inserted into the suction port (40), and a downstream end of the gas supply pipe (42) is inserted into the suction port (40). The primary air is sucked from the gap between the gas supply pipe (42) and the suction port (40) by the ejector effect of the fuel gas flow ejected from the fuel gas, and the fuel gas and the primary air are mixed in the mixing pipe part (41). Is done.

  A control board (30) having a control circuit for controlling the operation of the hot air generator (2) is installed at a predetermined position on the inner wall of the casing (4) in the control room (20). On the same surface of the control board (30), an alarm (31) made of a piezoelectric buzzer and an acceleration sensor (15) as a fall switch are installed.

  The alarm (31) is surely input when various operation switches of the display operation unit (44) are pressed by human operation such as ignition / extinguishing of the gas burner (23), temperature adjustment of the room temperature, timer setting, etc. This is notified by sound. In addition, the alarm (31) is connected to the power cord or gas hose at the time of lack of oxygen, when there is an oxygen deficiency, when the casing (4) is tilted or overturned, or when the casing (4) is moved. The alarm sound is set to be output even when stress due to pulling is applied to the hot air heater.

  As the acceleration sensor (15), for example, a conventionally known sensor in which a mechanical mechanism and an integrated circuit are integrally provided on a silicon wafer by MEMS technology can be used. In the present embodiment, the acceleration sensor (15) has a detection axis X-axis in the front-rear direction of the hot air heater, a detection axis Y-axis in the left-right direction of the hot-air heater, and a detection axis Z-axis in the vertical direction. Arranged on the control board (30) so as to coincide with each other, it is possible to detect the movement distance, the inclination angle, and the presence or absence of an impact from the change in the speed of the sensor itself.

  Such an acceleration sensor (15), unlike a mechanical contact type fall switch, does not detect tilt due to movement of a sphere, so vibration from the alarm (31) is provided on the same control board (30). Even if it is transmitted to the accelerometer (15), there is no false detection of the shock when the casing (4) is tilted or the power cord is pulled, and the acceleration sensor (15) itself vibrates. There is no sound. Furthermore, in the mechanical contact type overturn switch, the mounting position and direction of the overturn switch are limited due to the relationship between the sphere and the housing, but the acceleration sensor (15) can be installed in any direction at any position. Therefore, the mounting position and mounting direction of the control board (30) are not limited due to the characteristics of the overturn switch.

  In the present embodiment, the control circuit is configured to include a microcomputer, and although not shown, an operation control unit that controls the heating amount of the gas burner (23) and the rotation amount of the blower fan (21) by operating the operation switch. If the casing (4) is tilted or the power cord or gas hose is pulled and subjected to stress or impact, the operation of the hot air generator (2) is prohibited based on the signal from the acceleration sensor (15). In addition, an operation prohibiting unit for notifying a predetermined warning from the alarm (31) is included as a control configuration.

Next, the operation of the hot air heater of the present embodiment will be described with reference to the flowchart shown in FIG.
When the user turns on the operation switch of the display operation unit (44), the power is turned on in step S1, the blower fan (21) and the valve unit (22) are turned on, and the gas is supplied to the gas supply pipe (42 ) And is simultaneously ignited to start the combustion operation. Then, the warm air generated in the warm air generator (2) is discharged from the blower fan (21) to the outside of the casing (4). At this time, when the user operates the temperature adjustment switch or the air volume switch, a notification sound is generated from the alarm (31) .However, in the hot air heater of the present embodiment, the alarm (31) of the alarm (31) is used as a fall switch. Since the acceleration sensor (15) that is not affected by vibration is used, the inclination of the casing (4) is not erroneously detected, and the notification sound output from the alarm (31) “Nigori” does not occur.

  If the casing (4) moves during the combustion operation, the acceleration sensor (15) provided on the control board (30) in the hot air generator (2) moves the casing (4) in step S2. At the same time, the moving direction is detected in step S3.

  In step S4, the acceleration sensor (15) detects whether the casing (4) is tilted. If no tilt is detected (No in step S4), the process proceeds to step S5, and in step S3. It is determined whether or not there is an impact pulled in a direction opposite to the detected moving direction. For example, when the casing (4) is moved and the power cord or gas hose connected to the power source or the gas outlet is pulled and stressed, it is determined as Yes in step S5. . Then, in the next step S6, an alarm sound is output from the alarm (31) mounted on the same surface of the control board (30) together with the acceleration sensor (15), and the power cord or gas hose is stressed. And the power is turned off, and the operation of the hot air generator (2) is prohibited in step S7.

  If it is determined in step S4 that the casing (4) is inclined, it is determined in step S8 whether or not the value output from the acceleration sensor (15) is equal to or greater than a predetermined threshold A. If it is determined that the value is equal to or greater than the threshold value A (Yes in step S8), in step S9, a notification sound is output from the alarm device (31) to warn of the danger of continuation of driving and at the same time the power is turned off. In step S10, driving is prohibited.

  Thereafter, the casing (4) that has fallen or tilted is returned to the normal posture, so that the value output from the acceleration sensor (15) in step 11 is equal to or less than the predetermined threshold B at the time of return. In step 12, after waiting for a while in step 12, it is determined in step 13 whether or not the operation switch has been turned off. If the operation switch has been artificially turned off, in step S7 After the notification sound is output, the driving is prohibited.

  If it is determined in step 13 that the operation switch is not turned OFF, the process returns to step S1, the power is turned ON, and the operation of the gas fan heater is resumed.

  In the above embodiment, the gas fan heater is used as the hot air heater, but the present invention can also be applied to an oil fan heater or an electric heater.

(2) ・ ・ ・ ・ Hot air generator
(4) ・ ・ ・ ・ Case
(15) ... Acceleration sensor
(30) ... Control board
(31) ... Alarm

Claims (1)

Inside the casing where the power cord is extended, a hot air generator, and a control board having a control circuit for controlling the operation of the hot air generator ,
An acceleration sensor that detects the inclination of the casing, and a notification device that informs by sound that artificial operations such as ignition / extinguishing and temperature adjustment have been performed with various operation switches ,
In the hot air heater having a control configuration for prohibiting the operation of the hot air generator when the inclination of the casing detected by the acceleration sensor is equal to or greater than a predetermined angle, the control circuit ,
The acceleration sensor also detects the moving direction of the casing,
The control board has the acceleration sensor and the alarm on the same plane,
The said control circuit is a warm air heater which has a control structure which prohibits the driving | operation of the said warm air generator, when it determines with the impact with which the said casing is pulled in the direction opposite to the said movement direction.

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