JPH06190197A - Ignition method for gas clothing drying machine - Google Patents

Abstract

PURPOSE:To ignite a gas burner in a weak fire state, thereby keeping clothing free from thermal damages at the time of ignition. CONSTITUTION:This ignition method for a gas clothing drying machine consists in inserting a gas flow rate regulating valve 44 into a gas circuit 43 to the gas burner 24, disposing an ignition device 47 and an ignition checking device 48 near the gas burner 24, actuating the ignition device 47 to ignite the gas burner 24 and checking an ignition completion state by the ignition checking device 47. The ignition device 47 is actuated in the state of maintaining the gas flow rate regulating valve 44 in a prescribed throttling state. The opening degree of the gas flow rate regulating valve 44 is thereafter gradually increased until the ignition checking device 48 emits an ignition check signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for igniting a gas clothes dryer, in which a gas burner is ignited in a low heat condition so that the clothes are not thermally damaged during the ignition. is there.

[0002]

2. Description of the Related Art In consideration of the characteristics of a gas burner which can generate a larger amount of heat than an electric heater, a clothes dryer using the gas burner has been developed. An example of such a clothes dryer is shown in FIG. The casing (1) has a rotating drum (1) for rotating and stirring clothing (M) (M).
The temperature sensor (27) is provided on the support ring (3) that accommodates the (0) and supports the front opening of the rotary drum (10). Further, a suction port (52) of the fan (5) is formed on the back wall of the drying chamber (13) surrounded by the rotating drum (10), and an exhaust passage (51) following the fan (5). A humidity sensor (28) is provided in the. Further, a gas burner (42) is arranged in the lower part of the casing (1), and the combustion exhaust gas generated in the gas burner (42) is dried from the air supply passage (4) connecting this and the drying chamber (13). It is supplied into the chamber (13) and is discharged to the outside from the exhaust passage (51) by the suction force of the fan (5). An ignition device (47) is provided near the gas burner (42).
And an ignition confirmation device (48).

When an operation switch (not shown) is operated, the ignition device (47) and the fan (5) start to operate, and the ignition confirmation device (48) continuously monitors whether or not the gas burner (42) is in an ignition state. To do. Then, when the gas burner (42) starts to burn, the combustion exhaust gas of the gas burner (42) is supplied from the air supply passage (4) into the rotary drum (10) to start the drying operation of the clothes (M) (M). . And during this drying operation, the temperature sensor (27)
The amount of combustion of the gas burner (42) is controlled while monitoring the temperature in the drying chamber (13), and thus the drying operation proceeds while maintaining the inside of the drying chamber (13) at the set temperature. And the exhaust path
The dry condition of the clothes (M) (M) is judged based on the humidity of the exhaust gas detected by the humidity sensor (28) installed in (51), and when it reaches the dry condition, the gas burner (42) is extinguished and the fan (5) Stop. This ends the drying operation of the clothes (M) (M).

However, the above-mentioned conventional device has a problem that the clothes (M) (M) may be thermally damaged at the beginning of the drying operation. The above problems will be described in more detail. In ordinary dryers, clothing made of heat-sensitive material (M) (M)
The temperature in the drying chamber (13) can be switched in consideration of the case of drying.

However, when drying clothes (M) (M) or a large amount of clothes (M) (M) made of a material resistant to heat, a gas burner (42) is used.
Since it is necessary to burn the gas with a large amount of heat, the gas amount adjusting valve (44) inserted in the gas circuit (43) to the gas burner (42) is left in a large open state when the drying operation under such conditions is completed. It's stuck. Therefore, the gas amount adjustment valve
When the clothes (M) (M) made of heat-sensitive material are dried in the above condition where the opening of (44) is large, the gas burner (42) burns strongly immediately after ignition, and then the heat power decreases. As a result, the inside of the drying chamber (13) is maintained at a predetermined temperature.
Then, immediately after ignition of the gas burner (42), the gas burner (42)
When high temperature combustion exhaust gas is supplied from the (42) into the drying chamber (13) and is blown directly to the above-mentioned clothes (M) (M) which are weak against heat, the clothes (M) (M) are heated. Will be damaged.

The present invention has been made in view of the above-mentioned points. "The gas amount adjusting valve is provided in the gas circuit (43) to the gas burner (42).
(44) is inserted, an ignition device (47) and an ignition confirmation device (48) are arranged in the vicinity of the gas burner (42), and the ignition device (47) is operated to ignite the gas burner (42). Along with the ignition confirmation device (48) for confirming the ignition completion state, the ignition method of the clothes dryer, in which the heating power of the gas burner (42) at the time of ignition can be set low
(M) The task is to prevent (M) from being thermally damaged.

[0007]

[Technical Means] A technical means of the present invention for solving the above-mentioned problem is to operate an ignition device (47) while maintaining a gas amount regulating valve (44) in a predetermined throttle state, and then confirm ignition. The opening degree of the gas amount adjusting valve (44) is gradually increased until the device (48) outputs an ignition confirmation signal. ”

[0008]

The above technical means operates as follows. First, the gas amount adjusting valve inserted in the gas circuit (43) to the gas burner (42)
The opening degree of (44) is maintained at a predetermined throttle state, and then the ignition device (47) is operated. As a result of operating the ignition device (47), the gas burner (42) does not enter the ignition state and the ignition confirmation device (4
When 8) does not output the ignition confirmation signal, the opening degree of the gas amount adjusting valve (44) is gradually increased while the ignition device (47) is operating. That is, the ignition operation by the ignition device (47) is continued while gradually increasing the amount of gas supplied to the gas burner (42). Then, when the gas burner (42) is in the ignition state and an ignition confirmation signal is output from the ignition confirmation device (48), the gas amount adjusting valve (44) is changed to a predetermined opening degree so that the set heating power is obtained. To do.

As described above, according to the above technical means, the gas burner (4
Since the ignition operation to 2) is executed, even if the amount of gas that can be ignited differs for each ignition due to fluctuations in the supply gas pressure and variations in the operation of the igniter, the gas burner (42) begins to burn in a low-fire state. Therefore, the gas burner (42) does not suddenly ignite a strong flame when ignited.

[0010]

[Effect] The present invention has the following unique effects. Since the gas burner (42) does not suddenly burn in high flame upon ignition, there is no inconvenience that the clothing (M) (M) is overheated at the start of the combustion and the clothing is thermally damaged.

[0011]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. The main body of the dryer has the same structure as that shown in Fig. 1, and the temperature sensor (27) is provided near the lower part of the fixed support ring (3) that supports the front opening of the rotating drum (10).
Is installed and the humidity sensor (2
8) is provided. Also, the gas circuit to the gas burner (42)
A main valve (45) and a gas amount adjusting valve (44) are inserted in this order from the upstream side of (43). Further, the rotary drum (10) and the fan (5) are rotated by a common motor (50).

As shown in FIG. 2, each of the electric components is controlled by a control circuit (6) incorporating a microcomputer, and the control circuit (6) includes the temperature sensor (27) and the temperature sensor (27). In addition to the humidity sensor (28), etc., an operation switch (35) and a temperature switch (36) are connected. The temperature changeover switch (36) is operated when drying clothes (M) (M) made of a material weak against heat.
The operation switch (35) and the like are disposed on an operation section (not shown) formed on the front surface of the instrument body.

The control program having the contents shown in the flowchart of FIG. 3 is stored in the microcomputer provided in the control circuit (6), and the operation of the clothes dryer will be described below with reference to FIG. To do. ． In step (71), the operation of the operation switch (35) is monitored, and when this is operated, step (72) is further executed to determine whether or not the temperature changeover switch (36) is turned on. Then, when the temperature changeover switch (36) is turned on, the set temperature T is set to "60 ° C", and conversely, when the temperature changeover switch (36) is not turned on, the set temperature T is set to "80 ° C" (step (73)). ． Next, step (74) is executed to set the valve opening degree K of the gas amount adjusting valve (44) to 30% of the maximum opening degree. That is, this is maintained at 30% of the maximum opening regardless of the opening of the gas amount adjusting valve (44) at the end of the preceding drying operation. Then, in this state, step (75) is executed and the main valve (4
5) is opened and the motor (50) is driven to rotate the fan (5) and the rotating drum (10), and further, the ignition device (47) is held in an operating state. Further, it is monitored whether or not the gas burner (42) has burned by judging the output of the ignition confirmation device (48) (see step (76)). Next, if the gas burner (42) does not burn even after 1 second, the valve opening degree K is set to 10%.
Monitor whether the gas burner (42) burns in incremental steps (see step (78)). That is, by repeating steps (76) to (78) until the gas burner (42) burns, the opening of the gas amount adjusting valve (44) is increased stepwise.

It should be noted that the increase in the opening of the gas amount adjusting valve (44) is suppressed to 90% of the maximum opening, and if there is no output from the ignition confirmation device (48) for 20 seconds from the start of the ignition operation, the ignition cannot be performed. Judge and stop the ignition operation. That is, the main valve (45) is closed and the ignition device (47) is stopped. When it is confirmed that the combustion of the gas burner (42) has started when step (76) is executed, step (79) is executed to stop the ignition device (47).

In this case, in the above, the gas amount adjusting valve (4
Since the ignition operation to the gas burner (42) is continued while gradually increasing the opening degree of 4) from the throttled state, the amount of gas that can be ignited by each ignition due to fluctuations in the supply gas pressure and variations in the operation of the ignition device. , The gas burner (42) ignites and begins to burn in the weakest possible ignition condition for the supplied gas. Therefore, it is possible to prevent the disadvantage that the clothes (M) (M) are blown with high-temperature hot air and are thermally damaged. ． Next, when steps (80) to (83) are executed and the drying chamber temperature S detected by the temperature sensor (27) arranged in the drying chamber (13) is higher than the set temperature T already described, the valve is opened. The value of degree K is 10
%, And conversely, when the drying chamber temperature S is lower than the set temperature T, the value of the valve opening degree K is increased by 10%. If the drying chamber temperature S is not lower than the set temperature T when the above step (82) is executed, the value of the valve opening degree K is maintained at the current value. ． At step (84), the built-in timer A of the microcomputer is set to "0", and then steps (85) and (86) are executed to monitor whether or not the humidity sensor (28) gives a dry end signal. Wait for 10 seconds. Then, when the time of 10 seconds elapses before the drying end signal is output from the humidity sensor (28), the process returns to step (80) again and the drying chamber temperature S is returned.
And the set temperature T are compared, and the gas amount adjusting valve (44)
The inside of the drying chamber (13) is maintained at the set temperature T while adjusting the opening degree.

On the other hand, when the humidity sensor (28) outputs a dry end signal when the step (86) is executed, the main valve (45)
Close the to extinguish the gas burner (42) and the motor (50).
To stop the drying operation. In the above embodiment, the opening of the gas amount adjusting valve (44) is increased by 10%, but other units (for example, 20%, 5%, etc.) are used.
You may make it increase with. Further, it is not necessary to set the opening degree of the gas amount adjusting valve (44) to 30% when starting the ignition operation, and the gas amount adjusting valve (44) is set to 20% or 50%.
The ignition operation may be started with the opening maintained at.
Further, in the above-mentioned embodiment, the opening of the gas amount adjusting valve (44) is increased at intervals of 1 second, but the time interval does not necessarily have to be set to 1 second.

Further, in the above embodiment, the opening of the gas amount adjusting valve (44) is increased stepwise, but the ignition may be performed while continuously increasing it.

[Brief description of drawings]

FIG. 1 is a sectional view of a clothes dryer.

[Fig. 2] Control circuit diagram

FIG. 3 is a control flowchart.

[Explanation of symbols]

 (1) ・ ・ ・ Casing (42) ・ ・ ・ Gas burner (43) ・ ・ ・ Gas circuit (44) ・ ・ ・ Gas amount adjusting valve (47) ・ ・ ・ Ignition device (48) ・ ・ ・ Ignition confirmation device

Claims (1)

[Claims] 1. A gas amount adjusting valve (44) is inserted into a gas circuit (43) to a gas burner (42), and an ignition device (47) and an ignition confirmation device (48) are provided near the gas burner (42). In the ignition method of the clothes dryer, which is arranged, the ignition device (47) is operated to ignite the gas burner (42), and the ignition completion state is confirmed by the ignition confirmation device (48). Ignition device (47) with the valve (44) maintained at a predetermined throttle state
The ignition method for the gas clothes dryer, wherein the opening degree of the gas amount adjusting valve (44) is gradually increased until the ignition confirmation device (48) outputs an ignition confirmation signal.