JP2005087445A - Gas dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas dryer that can be unerringly ignited, and blows out a large quantity of hot air during use as a hair dryer and is easy to use. <P>SOLUTION: An operating switch (40) functions to supply power from a battery (14) to a motor (9)-driven fan (8), in association with the switching thereof from an off condition to an on condition, supply a raw gas from a gas cylinder (28) to a burner (5) by the opening of an opening and closing valve (21) and ignite the burner (5) by ignition mechanisms (6) and (23). A revolution speed control section (53) makes a mixed gas of a raw gas concentration suited for ignition exist in the vicinity of the burner (5) at the time of ignition and blows out a large quantity of warm air after ignition by controlling the fan (8) driven by the motor (9) so as to rotate it at a low speed when the off condition is switched to the on condition, and then at a high speed after an elapse of a fixed time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas dryer in which hot air is blown out using heat generated by burning a gas filled in a gas cylinder.

In a gas dryer, a small gas cylinder is attached to the dryer body, and the raw gas flowing out from the gas cylinder is mixed with air sucked from an intake port by a motor-driven fan using a portable power source such as a battery as a power source. Then, the mixed gas is ignited by the spark generated by the ignition device and burned in the burner unit, and the air around the burner unit is heated to produce warm air, which is blown out from the air outlet.
Since this type of dryer does not use electric power as a heat source, a portable power source such as a battery can be minimized, and is excellent in portability (see, for example, Patent Document 1).

On the other hand, since gas (fuel gas such as isobutane) is sealed in the gas cylinder, care must be taken when handling the dryer.
Therefore, as a safety measure when not in use, gas outflow from the gas cylinder is stopped, the ignition device is stopped, and the power supply circuit between the battery and the motor is shut off.
JP-A-5-137612

  Safety measures for gas dryers must be ensured not only when not in use but also when in use. In particular, if an ignition error occurs during ignition in the burner section, the mixed gas containing raw gas and air will continue to flow without being burned, so it is detected whether or not it has ignited normally. It is necessary to prevent ignition mistakes as much as possible during ignition.

  As a safety measure to prevent ignition mistakes, if the concentration of raw gas near the igniter attached near the burner is too dilute or too rich, it is easy to cause an ignition error during ignition. In accordance with the flow rate of the raw gas supplied from the gas cylinder, the fan is sucked in with an air flow at an appropriate flow rate so that it can be ignited reliably, so that the raw gas concentration becomes a concentration suitable for ignition. It is conceivable to determine the rotational speed.

On the other hand, in order to improve the usability of the gas dryer for the user, it is desirable that a large amount of hot air can be blown out from the air outlet of the gas dryer. For this purpose, it is necessary to increase the air volume by increasing the rotational speed of the motor-driven fan.
However, if the rotational speed of the motor-driven fan is increased to increase the air volume for the purpose of giving priority to ease of use, the concentration of raw gas near the igniter becomes dilute, and it is easy to cause an ignition error during ignition, which is a safety problem. .

  Therefore, the first object of the present invention is to provide an easy-to-use gas dryer that makes it difficult to cause an ignition error when the burner is ignited, and that a large amount of hot air can be blown out when the dryer is used after ignition. And

  A gas dryer according to the present invention, which has been made to solve the above problems, includes a cylindrical case having an air inlet and an air outlet, and a motor for sucking air from the air inlet into the cylindrical case and blowing it out of the air outlet. A drive fan, a burner for heating air in a cylindrical case, an ignition mechanism for igniting the burner, a gas cylinder filled with raw gas, and a gas connecting the gas cylinder and the burner via an on-off valve A gas dryer having a flow path, a battery for a power source, a rotation speed control unit for controlling the rotation speed of a fan, and an operation switch, wherein the operation switch is switched from an off state to an on state. Is configured to perform energization from the battery to the motor, supply of raw gas from the gas cylinder to the burner by opening the on-off valve, and ignition operation of the burner by the ignition mechanism. Speed control unit, once rotating a low speed fan when the switching operation is performed in the operation switch to the ON state from the OFF state, so as to control such that the high speed after a predetermined time has elapsed.

In this gas dryer, the motor is energized from the battery by switching the operation switch from the OFF state to the ON state, and air is sucked from the intake port and blown out from the air discharge port by the rotation of the fan driven by the motor. Also, by this switching, the gas flow opening / closing valve is opened so that the raw gas is supplied to the burner, and a mixed gas of air and raw gas exists in the vicinity of the burner.
At this time, since the rotational speed control unit initially controls the fan driven by the motor to rotate at a low speed, the amount of air taken in is suppressed, the concentration of raw gas in the mixed gas does not decrease, and the concentration suitable for ignition Is maintained. Therefore, the ignition mechanism ignites the burner while the fan is rotating at a low speed to ensure ignition.
Once ignited, the combustion state can be maintained even if the supply amount of air is increased (ie, the concentration of raw gas in the mixed gas is reduced), so the fan is controlled to rotate at high speed. Blow out a large amount of warm air.

  According to the above invention, when the gas dryer is ignited, the motor-driven fan is rotated at a low speed so that the raw gas concentration in the mixed gas is maintained at a concentration suitable for ignition. The fan can be rotated at a high speed after ignition, so that a large amount of hot air can be blown out and a convenient dryer can be obtained.

  Furthermore, even if ignition fails, the motor-driven fan rotates at a high speed after a lapse of a predetermined time, so the mixed gas with a high concentration of raw gas will never be filled in the vicinity of the burner, and sudden ignition will occur. Therefore, safety can be improved.

In addition, the gas dryer may be provided with an ignition detection device in the vicinity of the burner, and the rotation speed control unit may be controlled to switch to high speed rotation when the ignition detection device detects ignition of the burner during low speed rotation.
As a result, it is possible to rotate the fan at high speed after confirming ignition, so safety is increased, and the fan can be shifted to high speed rotation in a short time. A large amount of hot air can be blown out.

Further, the ignition detection device may determine that the burner has ignited when the temperature change per certain time is larger than a reference value.
According to this, since the temperature change due to heat when the burner burns is detected and the ignition is determined, the ignition can be reliably detected.

Further, the ignition detection device has two reference values, ie, a first reference value and a second reference value smaller than the first reference value, as reference values for the ignition determination, and switches from the on state to the off state. When the switching operation is performed again from the off state to the on state within a predetermined time (for example, within 3 seconds) after the switching operation is performed, the burner is determined to be ignited based on the second reference value. The burner ignition determination may be performed based on the first reference value.
The detection result of the temperature change by the ignition detection device may be different between when the burner is not burning immediately before and when it is burning. Therefore, in order to accurately determine ignition, it is determined whether the burner is cold or warm by measuring the time after the operation switch changes to the off state. In addition, since the reference value for the ignition determination is changed depending on the situation when the heat from the previous combustion remains and is in a warm state, the ignition determination due to the temperature change can be made more accurately.

The operation switch has two on states, the first on state and the second on state. The switch is switched from the off state to the first on state by energizing the motor and opening the on-off valve. Immediately after the supply of raw gas and the control of the low speed rotation of the fan by the rotation speed control unit are started, and the ignition of the burner is performed by the ignition mechanism in the switching operation from the first on state to the second on state. You may comprise so that it may return to a 1st on state.
According to this, since a slight time difference can be provided between the first on state and the second on state, ignition can be performed after the mixed gas is sufficiently present in the vicinity of the burner. Ignition operation can be performed.

Further, after the switching operation from the off state to the first on state, when the switching operation to the second on state is not performed within a predetermined time, the rotation speed control unit may perform control to rotate the fan at a high speed. Good.
According to this, when the raw gas is not ignited for a predetermined time in a state where the raw gas is flown, it is determined that the ignition does not occur, and the fan automatically switches to high speed rotation after the predetermined time has elapsed. It can be diverged and can be immediately transferred to a safe state.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side internal explanatory view of a gas dryer according to an embodiment of the present invention, and FIGS. 2 to 4 are operation explanatory views of each member showing each stage of the ignition operation.

  (1) is a pistol-type dryer body, (2) is a cylindrical or elliptical cylindrical case having a longitudinal cross-sectional shape having a vent (3) on the front side and an intake port (4) on the rear side. 5) is a burner disposed at a position close to the air discharge section (3) side in the cylindrical casing, (6) is an igniter (spark plug) that ignites raw gas fixed near the burner, (7) ) Is an ejector for taking in air necessary for combustion in the burner, and (8) is a motor disposed near the intake portion (4) side in the cylindrical case, and rotationally drives the fan (9).

  (10) is a bulging portion formed integrally with the case at the lower part of the cylindrical case (2), and a void (11) is formed in the hollow case. There is no control board with a microcomputer. This control board looks at the combustion state of the burner (5), detects the opening and closing of the gas flow path, detects the battery voltage, and controls the rotational operation and rotational speed of the motor (8), etc. and abnormal overheating of the burner It is equipped with a circuit that incorporates safety software that shields the gas flow path in the event of an ignition error in the burner (5). In addition, the control board has a built-in timer so that it can measure the time required for various operations. (12) is a lamp which is disposed in the space (11) and monitors the ignition state of the burner (5) from the outside of the bulging portion.

  (13) is a space storage portion formed along the outer wall surface of the cylindrical case (2), and in this embodiment, four AA batteries (14) are formed in an arc shape. Housed and connected in series two by two are connected in parallel. However, you may simply store two and connect them in series.

  (15) is an ignition detection device provided in the vicinity of the burner (5), which detects whether or not the raw gas has been ignited. In this embodiment, the temperature rise in the burner during ignition is detected using a thermistor. To detect.

  In other words, a reference value for temperature rise determination is prepared, and if there is a temperature rise above the reference value within a certain time, it is judged that the ignition has occurred, and if the temperature rise is less than the reference value, it is judged that there is a mis-ignition. However, the actual ignition judgment is made by the circuit incorporated in the control board described above.

  In this embodiment, two reference values are prepared, and the burner is not burned immediately before, and when the vicinity of the burner is cooled, the larger reference value is adopted, and the burner is burned until immediately before. In the state where the previous combustion heat remains, such as when it is ignited again within a short time (eg 3 seconds) after extinguishing the burner, the smaller reference value is adopted according to the situation. Judgment is made.

  (16) is a hollow handle having a cylindrical or elliptical cross section connected to the bulging portion (10) so as to be bent (turnable) by a shaft (17). An upper space part (19) and a lower space part (20) are formed by partitioning the interior vertically with a plate (18), and each space part is linearly arranged in the handle.

  The upper space (19) is located close to the cylindrical casing (2) side, applies a high voltage to the on-off valve (21) of the gas flow path to the burner (5) and the igniter (6) and the motor. The operation switch (22) for disconnecting power to (8) and the ignition device (23) are housed and fixed.

  The lower space portion (20) has an opening (24) on the side opposite to the partition plate, and the partition plate (18) is attached in a state of being securely fitted and fixed in the handle (16). The extending portion (25) on the (19) side (see FIG. 2) and the engaging portion (26) on the lower space (20) side (see FIG. 2) are integrally formed, and the extending portion (25) The gas hose (27) is connected to the engagement portion (26), and the gas supply portion (29) of the gas cylinder (28) constitutes a connection portion (30).

  Next, devices and functional parts arranged in the upper space (19) will be described. The on-off valve (21) opens and closes the gas flow path provided in a part of the gas hose (27) connecting the extending portion (25) and the burner (5). Always closes the gas flow path and has a shaft (31) that opens the gas flow path by pulling out.

  (32) is a responding body (solenoid coil) disposed in the vicinity of the on-off valve (21), and has a spindle (33) which is slidable and always protrudes on one side. 33) is immersed by the electric energy from the power source of the battery (14) through the control board and holds the gas flow path of the on-off valve (21) (a self-holding circuit is used). .

  (34) is a link mechanism pivotally supported in the vicinity of the on-off valve (21) and the responder (32). One end is locked to the shaft (31) of the on-off valve (21) and the other end is a spindle (33). In the state shown in FIG. 2, the on-off valve (21) closes the gas flow path and the spindle (33) protrudes. That is, the spindle (33) is configured to open the gas flow path in the immersed state and close the gas flow path in the protruding state.

  Therefore, when the link mechanism (34) rotates in the direction of the arrow shown in FIG. 2, one end moves the shaft (31) to open the gas flow path, and the other end moves with the immersion of the spindle (33). In the operation in the embodiment, the link mechanism (34) is rotated by moving the shaft (31) by pressing (immersing) the spindle (33) by an external force (pressing an engaging piece (38) described later). Open the gas flow path.

  The operation switch (22) opens and closes the electric circuit between the battery (14) and the motor (8) and the electric circuit with the control board, and is turned on and off by the rotation of the operation lever (35). (36) is a "<"-shaped arm lever which is pivotally supported at one end and free at the other end, and has an operating pin (37) integrally formed at the intermediate portion and a responder (32) at the other end. ) Has an engaging piece (38) facing the tip of the spindle (33). (39) is an ignition device connected to the control board and the igniter (6). When the end is pressed, a high voltage is generated by the piezoelectric effect and discharged from the igniter (6) to ignite the raw gas. The igniter (6) and the ignition device (39) constitute an ignition mechanism for the burner.

  (40) is an operation knob that is slidably mounted in the vertical direction along the front wall of the handle (16), and functions as an operation switch for the dryer user. The OFF position (OFF state) and ON position In addition to (first on state), it is possible to move to an ignition position (second on state) temporarily taken during ignition.

An operation projection (44) is formed on the front side of the operation knob (40), and each part of the striker (41), the operating piece (42), and the ridge (43) is formed on the back side. By sliding the operation knob (40) from the OFF position to the ON position, the operating piece (42) and the ridge (43) switch the ON / OFF of the operating switch (22), and the arm lever (36) is moved. Then, the spindle (33) of the responding body (32) is immersed, and at the same time, the shaft (31) is moved via the link mechanism (34) to open and close the gas flow path.
Further, by sliding from the ON position to the ignition position, the striking piece (41) operates the ignition device (38) to generate a high voltage and generate a spark in the igniter (6).

  In this way, by moving the operation knob (40) in a plurality of stages, the striker (41), the operating piece (42), and the ridge (43) are appropriately operated, whereby the operation switch (22 ) Is turned on and the motor is rotated to open the gas flow path, and then a high voltage is generated from the igniter (6) to immediately ignite the raw gas and burn it with a burner.

Next, an actual ignition operation for the burner will be described with reference to FIGS.
First, as described above, the state of FIG. 2 (off state) in which the gas flow path is closed and the power from the battery is not supplied will be described. The operation protrusion (44) of the operation knob (40) (see FIG. 1) is at the lowest position (OFF position), and the operation piece (42) of the operation knob (40) does not press the operation lever (35). Since the protruding portion (43) is below the operating pin (37) and the engaging piece (37) does not push the spindle (33), the link mechanism (34) is in a state where the shaft (31) is immersed. The operation switch (22) is OFF, and the on-off valve (21) and the responder (32) both close the gas flow path.

  Next, in order to perform the ignition operation, the operation knob (40) is slightly slid upward (ON position), the operation switch (22) is turned on, and the battery power is supplied to the motor (8). Is applied to the responder (32) to hold the open / close valve (21) (operating the self-holding circuit), and the raw gas is supplied to the burner (5) as shown in FIG. 3 (first on state). State.

In this state, as the operating knob (40) slides, the operating piece (42) pushes the operating lever (35) to turn on the operating switch (22), whereby the battery (14) is powered by the motor (8). The motor rotates and sucks air from the intake port (4) by the fan (9). The rotation speed of the motor at this time is limited to low-speed rotation by a signal from the control board.
At the same time, the engaging piece (38) of the arm lever (36) pushes the spindle (33) when the ridge (43) pushes over the operating pin (37) and gets over (during sliding from the OFF position to the ON position). Open the gas flow path.

In the state of FIG. 3 (first on state), the self-holding circuit is activated after the ridge portion (43) gets over the operating pin (37), and the power from the battery (14) is supplied via the control board. The spindle (33) of the responder (32) continues to be immersed by the electrical energy, and the gas flow path of the on-off valve (21) is kept open.
In addition, it is a slight time of 1 second or less until the operation knob (40) slides to the next state of FIG. 4 (second on state).

Next, the operation state of FIG. 3 will be described from the standby state where the raw gas is supplied to the burner (5) and the motor (8) is rotating at a low speed to the state of FIG. 4 where the raw gas is ignited. .
In a state where the operation knob (40) is slid from the position (ON position) in FIG. 3 to the upper side (ignition position), the state where the spindle (33) is pushed down by the self-holding circuit is maintained, and the link mechanism (34) is further maintained. The shaft (31) is continuously pulled out, the on-off valve (21) is continuously opened, and the gas flow path is opened.

  Without being interrupted by this operation, the striking piece (41) of the operation knob (40) presses the pressing element (45) of the ignition device (39) to activate the high voltage generating mechanism in the ignition device (39). A high voltage is applied to the igniter (6) to ignite the raw gas.

  After the operation knob (40) is slid to the uppermost position (second insertion state) and the pressing element (45) is pressed, the operation knob (40) is restored by the restoring force of the pressing element (45) itself. ) Is pushed back to the position of FIG. A mechanism for generating a return force for returning the operation knob to the position shown in FIG. 3 may be separately provided on the operation knob (40) side.

  On the other hand, when the ignition operation to the raw gas ends, the operation knob (40) returns to the original position (ON position) as described above. At this time, the battery power is continuously supplied to the motor by an electric signal from the control board (by the operation of the self-holding circuit), and the open / close valve (21) is continuously opened by the responder (32).

  When a stable combustion state is detected by the ignition detection device (15) within a certain time after the start of the ignition operation, the rotational speed of the motor (8) that drives the fan (9) from the control board is increased. A signal to switch to.

Next, a control system in the gas dryer according to the present embodiment will be described with reference to a block diagram shown in FIG.
The control of the gas dryer is performed by the control unit 50 using a microcomputer mounted on the control board.
The power supply voltage of the battery (14) is supplied to the control unit 50, and an ignition detection device (15) (thermistor) is connected to the input side.

  On the other hand, on the output side, a motor (8) for driving a fan, a responder (32) (solenoid coil) used for electrically opening and closing the gas flow path by a self-holding circuit, and a display for displaying the state A lamp (12) is connected.

  Further, the control unit 50 includes an internal timer unit (51) that measures the time required for control, and performs ignition determination by determining the magnitude of temperature change per fixed time by comparison with a preset reference value. The determination part (52) and the rotational speed control part (53) which control the rotational speed of a motor drive fan according to an operation state are included.

  In addition to the above, the control unit (50) also controls an overtemperature detection circuit, a power supply voltage detection circuit, a self-holding circuit for supplying battery power, and the like using known techniques, but these descriptions are omitted. .

  Next, each operation state and transition between each operation state when using the gas dryer of the present embodiment will be described. FIG. 6 is a diagram for explaining the relationship between each operation state that the gas dryer of this embodiment can take.

  As shown in FIG. 6, this gas dryer has any one of a standby mode, a first ignition determination mode, a normal operation mode, a normal stop mode, a second ignition determination mode, a degassing mode, and a non-ignition stop mode as an operation state. Take a state.

  The standby mode is a mode when the dryer is stopped. The fan (9) is stopped, the on-off valve (21) (gas plug) is closed, and the lamp (12) is turned off. Further, the power supply from the battery (14) is also stopped.

The first ignition determination mode is the first mode when the operation switch is turned on (first on state) in the standby mode. The fan (9) rotates at a low speed and the on-off valve (21) (gas plug) is open. The lamp (12) is blinking.
The reason why the fan (9) is rotated at a low speed is to increase the concentration of raw gas by suppressing the amount of air taken in so as to ensure ignition.

  The normal operation mode is a mode when the ignition is normally performed as a result of performing the ignition operation (second on state) by the operation switch. The fan (9) rotates at high speed and the on-off valve (21) (gas plug) opens. Status, lamp (12) is lit.

  The normal stop mode is a mode when the operation switch is turned OFF (OFF state) in the normal operation mode. The fan (9) rotates at high speed, the on-off valve (21) (gas plug) is closed, the lamp ( 12) is off.

  In the second ignition determination mode, after switching from the normal operation mode to the normal stop mode by turning the operation switch OFF, the operation is performed again without taking any time (for example, within 3 seconds, during this time, it does not shift to the standby mode). This is the mode when the switch is turned on (that is, when it is determined that heat from the previous combustion remains in the vicinity of the burner (5)), the fan (9) is operated at low speed, and the on-off valve (21) (gas The plug is open and the lamp (12) is flashing. Here, the reason why the fan (9) is rotated at a low speed is to increase the raw gas concentration by suppressing the amount of air taken in so that it can be ignited reliably as in the first ignition determination mode.

  In the first ignition determination mode and the second ignition determination mode, a temperature change per fixed time is detected by the ignition detection device (15), and the ignition is determined by comparing this with a reference value. However, in this determination, the reference value (a) in the first ignition determination mode is larger than the reference value (b) in the second ignition determination mode, and the temperature in the second ignition determination mode is changed. By making it sensitive, an appropriate determination can be made according to the temperature state in the vicinity of the burner (5).

  The degassing mode can be determined when the first ignition determination mode or the second ignition determination mode is not ignited within a predetermined time (for example, 10 seconds) or when the normal operation mode is set to fire extinguishing (for example, temperature change by a thermistor). Mode), the fan is rotating at high speed, the gas stopper is closed, and the lamp is turned off.

The non-ignition stop mode is a mode that transitions when the operation switch is turned off without performing the ignition operation after the operation switch is turned on in the standby mode and becomes the first ignition determination mode. The gas tap is closed and the lamp is off.
Note that the transition relationship between other modes is only illustrated in FIG. 5, and detailed description thereof is omitted.

  FIG. 7 is a diagram illustrating a typical time chart for explaining the operation of the gas dryer according to the present embodiment. This time chart is until the operation switch (operation knob (40)) is operated to use the dryer normally, and then the operation switch is turned OFF to stop.

  Initially, the operation switch is OFF (OFF state) and is in the standby mode, the fan (9) is stopped, the on-off valve (21) (gas plug) is closed, and the lamp (12) is turned off. At this time, the power supply from the battery is also stopped.

When the operation switch is turned on (first on state), the first ignition determination mode is entered, power supply from the battery (14) is started, the fan (9) rotates at a low speed, and the on-off valve (21) is opened. The lamp (12) flashes. Thereby, the mixed gas of the raw gas concentration suitable for ignition exists in the vicinity of the igniter (6).
At the same time as the operation switch is turned ON, a timer for ignition determination is activated, and the burner (5) is normally burned within a predetermined time (within 10 seconds in this embodiment). If it is detected that the ignition is normal, it is determined that the ignition is normally performed, and if the ignition is not detected within a predetermined time, the mis-ignition state is determined. In this time chart, it is assumed that the combustion state is reached within a predetermined time.

  During the first ignition determination mode, ignition is performed by operating the operation switch (sliding the operation knob (40) to the ignition position to the second on state), and the ignition is determined within a predetermined time (within 10 seconds). As soon as the operation is performed, the first ignition determination mode is changed to the normal operation mode, the fan (9) rotates at a high speed, and the lamp (12) is turned on. As a result, a large amount of hot air is blown out from the air outlet of the dryer.

When the operation switch is turned off after the use in the normal operation mode is finished, the normal operation mode is switched to the normal stop mode, and the fan (9) maintains high speed rotation for 3 seconds, and the on-off valve (21) (gas plug) ) Is closed immediately, and the lamp (12) is turned off. Since the fan (9) maintains the high speed rotation for a while, the mixed gas containing the raw gas is released to the outside in a short time, so that a safe state is obtained.
In the normal stop mode, the power supply from the battery (14) is maintained by the self-holding circuit.

  When a predetermined time (3 seconds in this embodiment) elapses after entering the normal stop mode, the fan (9) is stopped, whereby the gas dryer is completely stopped and returned to the standby mode.

FIG. 8 is a diagram showing another typical time chart for explaining the operation of the gas dryer according to the present embodiment. The time chart of Fig. 8 shows that after using the gas dryer in the normal operation mode, once the operation switch is turned OFF, it is immediately turned ON again (within 3 seconds, that is, until the standby mode is entered) and reused. Shows when to do.
The steps from the standby mode to the first ignition determination mode and the normal operation mode in this time chart are the same as those in FIG.

  After use in the normal operation mode, the operation switch is temporarily switched from ON to OFF. As a result, a transition is made to the normal stop mode, the fan (9) rotates at high speed, the on-off valve (21) (gas plug) is closed, and the lamp (12) is turned off. At this time, the power supply from the battery (14) is maintained by the self-holding circuit.

If the normal stop mode continues as it is, the mode will eventually shift to the standby mode, but the operation switch is turned on again before the transition (within 3 seconds after the switch is turned off).
Thereby, it changes to 2nd ignition determination mode, a fan (9) rotates at low speed, an on-off valve (21) (gas plug) is an open state, and a lamp | ramp (12) will be in a blinking state. Accordingly, a mixed gas having a raw gas concentration suitable for ignition is present in the vicinity of the burner (5), and thereafter ignition is performed by performing an ignition operation with an operation switch.

  At the same time as the operation switch is turned ON, a timer for ignition determination is activated, and the ignition detection device (15) is normally in the combustion state within a predetermined time (within 10 seconds in this embodiment). If it is detected that the ignition is normal, it is determined that the ignition has been normally performed, and if the ignition is not detected within a predetermined time, the mis-ignition state is determined.

  In this time chart, it is assumed that normal ignition occurs again within a predetermined time (within 10 seconds) and a combustion state is obtained. When it is determined that the ignition detection device (15) has normally ignited within a predetermined time, the fan (9) immediately rotates at a high speed and the lamp (12) is lit. As a result, a large amount of hot air is blown out from the gas dryer.

  In the second ignition determination mode, since the heat from the combustion in the previous normal operation mode remains in the vicinity of the burner (5), it is more correct to detect the temperature change more sensitively by the ignition detection device (15). It can be performed. Therefore, as shown in FIG. 6, the reference value b smaller than the determination reference value a in the first ignition determination mode is used so that the ignition determination can be performed even if the temperature change per fixed time is small. Therefore, make an appropriate decision according to the situation.

  As described above, in this embodiment, as an operation switch, switching between OFF, ON, and ignition is performed by an operation knob and a circuit (self-holding circuit) in which mechanical switch means and electrical switch means are combined. The motor drive fan, on-off valve (gas plug), lamp, ignition mechanism, etc. are controlled. However, this is only an example, and it can be operated by other operation switch means without departing from the gist of the present invention. You may make it do.

  In this embodiment, the on-off valve (21) and the responding body (32) are provided separately so as to open the gas flow path. However, the on-off valve (21) and the responding body (32) are combined into one unit. The responder (32) may be a bypass valve independent of the on-off valve (21).

  According to the present invention, when the burner is ignited, the rotation speed of the motor-driven fan is lowered to ensure ignition, and at the time of use, the rotation speed is increased to increase the amount of hot air blown out. Therefore, it can be used to provide a safe and convenient gas dryer.

It is side surface inside explanatory drawing of the gas type dryer which is one Example of this invention. It is operation | movement explanatory drawing when an operation knob is an OFF position. It is operation | movement explanatory drawing when an operation knob is an ON position. The operation knob is an operation explanatory diagram of the ignition position. It is a block diagram which shows the control system of the gas type dryer which is one Example of this invention. It is a figure explaining the operation state which the gas type dryer which is one Example of this invention can take. It is a figure which shows the example of a time chart of the gas type dryer which is one Example of this invention. It is a figure which shows the example of a time chart of the gas type dryer which is another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dryer main body 2 Cylindrical case 3 Exhaust port 4 Intake port 5 Burner 6 Igniter 8 Motor 9 Fan 12 Lamp 14 Battery 15 Ignition detection device 21 On-off valve 22 Actuation switch 23 Ignition device 28 Gas cylinder 32 Responsive body 34 Link mechanism 35 Actuation lever 36 Arm lever 39 Ignition device 40 Operation knob 50 Control unit 51 Built-in timer unit 52 Ignition determination unit 53 Rotational speed control unit

Claims (6)

A cylindrical case having an air inlet and an air outlet, a motor-driven fan for sucking air from the air inlet into the cylindrical case and blowing it out from the air outlet, and a burner for heating the air in the cylindrical case And an ignition mechanism for igniting the burner, a gas cylinder filled with raw gas, a gas flow path connecting the gas cylinder and the burner via an on-off valve, a battery for power supply, and a fan rotation speed are controlled. A gas dryer having a rotation speed control unit and an operation switch,
In conjunction with the switching operation from the OFF state to the ON state, the operation switch performs energization from the battery to the motor, supply of raw gas from the gas cylinder to the burner by opening the on-off valve, and ignition of the burner by the ignition mechanism. Configured to be
The gas speed dryer, wherein the rotation speed control unit controls the fan to rotate at a low speed once when a switching operation of the operation switch from the off state to the on state is performed, and to rotate at a high speed after a predetermined time has elapsed. . The gas dryer is provided with an ignition detection device in the vicinity of the burner, and the rotation speed control unit controls to switch to high speed rotation when the ignition detection device detects ignition of the burner during low speed rotation. Item 2. A gas dryer according to item 1. 3. The gas dryer according to claim 2, wherein the ignition detection device determines that the burner has ignited when a temperature change per fixed time is larger than a reference value. 4. The ignition detection device has two reference values, a first reference value and a second reference value smaller than the first reference value, as reference values for determining ignition, and the switching operation from the on state to the off state is performed. When the switching operation is again performed from the off state to the on state within a predetermined time after the determination, the burner is determined to be ignited based on the second reference value, and after the predetermined time has elapsed, the burner is determined based on the first reference value. The gas dryer according to claim 3, wherein the ignition determination is performed. The operation switch consists of two on states, the first on state and the second on state. The operation switch energizes the motor by switching from the off state to the first on state, and the raw gas generated by opening the on-off valve. Immediately after the ignition of the burner is performed by the ignition mechanism in the switching operation from the first on state to the second on state. The gas dryer according to any one of claims 1 to 4, wherein the dryer is configured to return to an on state. The rotation speed control unit controls the fan to rotate at a high speed when the switching operation from the off state to the first on state is not performed within a predetermined time after the switching operation from the off state to the first on state. Item 6. A gas dryer according to Item 5.

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