WO2020135594A1 - Gas dryer - Google Patents

Abstract

A gas dryer (1), comprising a drum (20), an air suction passage (30), an exhaust passage (50), a circulation passage (51), a ventilator (53), an inlet temperature sensor (35), an outlet temperature sensor (57), a humidity sensor (58) and a control portion (60). The drum (20) is used for receiving laundry, the air suction passage (30) is provided with a gas burner (31) and is used for guiding air heated by the gas burner (31) into the drum (20), the exhaust passage (50) is used for discharging, from the drum (20) to the outside, air for drying the laundry within the drum (20), the circulation passage (51) makes the exhaust passage (50) communicate with the interior of the drum (20), and the ventilator (53) is provided within the exhaust passage (50) and adjusts the proportion, in the air flowing out of the drum (20), of the air discharged from the exhaust passage (50) to the outside. The inlet temperature sensor (35) measures a drum inlet temperature of air led into the drum (20) from the air suction passage (30), the outlet temperature sensor (57) measures a drum outlet temperature of air flowing out of the drum (20) to the exhaust passage (50), the humidity sensor (58) measures a drum outlet humidity of air flowing out of the drum (20) to the exhaust passage (50), and the control portion (60) controls the ventilator (53) on the basis of the drum inlet temperature measured by the inlet temperature sensor (35), the drum outlet temperature measured by the outlet temperature sensor (57), and the drum outlet humidity measured by the humidity sensor (58).

Description

Gas dryer Technical field

The present invention relates to a gas dryer that dries laundry containing moisture with air heated by a gas burner.

Background technique

A conventional gas dryer has a structure including a combustion chamber in which a gas burner is housed, a drying chamber having a drum connected to the combustion chamber, and a ventilation chamber connected to the drying chamber. The air introduced into the combustion chamber is heated by a gas burner, and then discharged to a drum containing laundry containing moisture. After that, the air used for drying in the drum passes through the ventilation chamber and is discharged to the outside of the gas dryer.

In the conventional gas dryer, the air outside the gas dryer sequentially passes through the combustion chamber, the drum of the drying chamber, and the ventilation chamber, and is discharged to the outside of the gas dryer.

In the initial stage of the drying operation, the laundry in the drum contains a large amount of moisture, and the high-temperature air introduced into the drum decreases its temperature by heat exchange with the laundry, and then is discharged to the outside of the gas dryer.

However, when the second half of the drying operation is reached, the drying of the laundry in the drum has made considerable progress. The high-temperature air introduced into the drum has little heat exchange with the laundry, and goes to the outside of the gas dryer discharge.

Therefore, in the gas dryer, high-temperature air is not used efficiently, and the drying operation efficiency is poor.

Existing technical literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2010-213973

Summary of the invention

Problems to be solved by the invention

An object of the present invention is to provide a gas dryer capable of improving the efficiency of drying operation.

Solutions for solving problems

That is, the gas dryer of the present invention is characterized by including: a drum that houses laundry; an air intake channel that has a gas burner for introducing air heated by the gas burner to the drum; and exhaust gas A channel for discharging the air used for drying the laundry in the drum from the drum to the outside; a circulation channel to communicate the exhaust channel with the inside of the drum; an adjustment unit arranged in the row In the air passage, adjust the ratio of the amount of air discharged from the exhaust passage to the outside of the amount of air flowing out of the drum; the inlet temperature sensor detects the air introduced into the drum from the suction passage Inlet temperature; outlet temperature sensor, which detects the drum outlet temperature of the air flowing from the drum to the exhaust channel; humidity sensor, which detects the drum outlet humidity of the air flowing from the drum to the exhaust channel; and control The unit controls the adjustment unit based on the drum inlet temperature detected by the inlet temperature sensor, the drum outlet temperature detected by the outlet temperature sensor, and the drum outlet humidity detected by the humidity sensor.

In the gas dryer of the present invention, preferably, when the outlet temperature of the drum detected by the outlet temperature sensor is equal to or higher than the first predetermined temperature, the control unit controls the adjustment unit so that The ratio decreases.

In the gas dryer of the present invention, preferably, when the outlet temperature of the drum detected by the outlet temperature sensor is lower than or equal to the second predetermined temperature lower than the first predetermined temperature, the control unit The adjustment unit is controlled to increase the ratio.

In the gas dryer of the present invention, preferably, when the humidity of the drum outlet detected by the humidity sensor is equal to or greater than the first specified humidity, the control unit controls the adjustment unit so that the The ratio increases.

In the gas dryer of the present invention, it is preferable that the control unit controls when the drum outlet humidity detected by the humidity sensor is lower than or equal to the second specified humidity lower than the first specified humidity The adjusting unit to reduce the ratio.

In the gas dryer of the present invention, it is preferable to include a gas valve that adjusts the amount of gas supplied to the gas burner, and the control unit controls the gas valve based on the ratio.

Effect of invention

In the gas dryer of the present invention, based on the drum inlet temperature, the drum outlet temperature, and the drum outlet humidity, the ratio of the amount of air discharged from the exhaust passage to the outside among the amount of air flowing out of the drum is switched. Therefore, the air introduced into the drum is sufficiently heat-exchanged with the laundry in the drum and then discharged to the outside, so that the drying operation efficiency can be improved.

In the gas dryer of the present invention, when all the air flowing out of the drum is discharged from the exhaust passage to the outside, the air introduced into the drum from the start of drying until the drum outlet temperature reaches the first predetermined temperature After being sufficiently heat-exchanged with the laundry in the drum, it is discharged to the outside, but when the outlet temperature of the drum reaches the first predetermined temperature, the air introduced into the drum does not exchange heat sufficiently with the laundry in the drum. External discharge. Therefore, when the outlet temperature of the drum reaches the first predetermined temperature, the ratio of the amount of air discharged from the exhaust passage to the outside among the amount of air flowing out of the drum is reduced, so that all or part of the air flowing out of the drum enters the drum cycle. This can prevent the air introduced into the drum from being discharged to the outside without sufficiently performing heat exchange with the laundry in the drum.

In the gas dryer of the present invention, after the drum outlet temperature reaches the first predetermined temperature, when all or part of the air flowing out of the drum is circulated into the drum, the temperature of the air circulating into the drum passes through the drum The laundry inside is gradually reduced by heat exchange. When the temperature of the drum outlet falls below the second predetermined temperature, the temperature of the air circulating into the drum is too low, and there is little heat exchange with the laundry in the drum. Therefore, the ratio of the amount of air discharged from the exhaust passage to the outside among the amount of air flowing out of the drum is increased, and the amount of air circulating into the drum is reduced, so that the temperature of the air in the drum can be increased.

In the gas dryer of the present invention, after the drum outlet temperature reaches the first predetermined temperature, when all or part of the air flowing out of the drum circulates into the drum, the humidity of the air circulating into the drum passes through the drum The laundry inside is dried and gradually rises. When the humidity at the drum outlet rises above the first predetermined humidity, the humidity of the air circulating into the drum is too high, and the laundry in the drum can hardly be dried. Therefore, the ratio of the amount of air discharged from the exhaust passage to the outside of the amount of air flowing out of the drum is increased, the amount of air circulating into the drum is reduced, and the humidity of the air in the drum can be reduced.

In the gas dryer of the present invention, after all or part of the air flowing out of the drum is circulated into the drum, when the humidity at the outlet of the drum rises above the first predetermined humidity, the amount of air circulating into the drum is reduced After that, when the temperature at the outlet of the drum drops below the second specified humidity, the air circulating into the drum cannot dry the laundry in the drum. Therefore, the amount of air flowing out of the drum from the exhaust passage to The ratio of the amount of air discharged from outside decreases, and the amount of air circulating into the drum is increased, so that the temperature of the air in the drum can be increased.

In the gas dryer of the present invention, when all or a part of the air flowing out of the drum is circulated into the drum, the amount of air introduced into the drum from the suction passage changes. Therefore, the amount of gas supplied to the gas burner is adjusted according to the amount of air introduced into the drum from the intake passage, thereby reducing the amount of gas consumed.

BRIEF DESCRIPTION

FIG. 1 is a diagram showing the configuration of the gas dryer 1 according to the first embodiment of the present invention, and showing a state where the ventilator 53 is switched to the fully open state.

FIG. 2 is a diagram showing a state where the ventilator 53 is switched to fully closed in the gas dryer 1 of FIG. 1.

FIG. 3 is a diagram showing a state where the ventilator 53 is switched to 25% on in the gas dryer 1 of FIG. 1.

Fig. 4 is a control block diagram of the gas dryer 1 of Fig. 1.

FIG. 5 is a flowchart of the drying operation control of the gas dryer 1 of FIG. 1.

FIG. 6 is a flowchart of the drying operation control of the gas dryer 1 of FIG. 1.

7 is a diagram showing the configuration of a gas dryer 101 according to a second embodiment of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

1 gas dryer; 20 drum; 30 suction channel; 31 gas burner; 33 gas valve; 35 inlet temperature sensor; 50 exhaust channel; 51 circulation channel; 53 ventilator (adjusting unit); 57 outlet temperature sensor; 58 humidity sensor; 60 control part (control unit).

detailed description

Hereinafter, a gas dryer as an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)

As shown in FIG. 1, the gas dryer 1 includes a casing 10 that constitutes an appearance. The front surface 10a of the housing 10 is formed with a washing inlet 11. The entrance 11 is covered by a door 12 that can be opened and closed freely.

A drum 20 containing laundry is rotatably arranged in the housing 10. The opening 20 a on the front surface of the drum 20 faces the input port 11 and is closed by the door 12 together with the input port 11.

The rear surface 10b of the casing 10 is connected to an air intake passage 30 that communicates with the rear surface 20b of the drum 20 and introduces air into the drum 20.

A gas burner 31 is arranged inside the intake passage 30, and after the air introduced into the intake passage 30 is heated by the gas burner 31, the air is led out into the drum 20. A gas supply pipe 32 for supplying gas is connected to the gas burner 31, and a gas valve 33 for adjusting the supply amount of gas to the gas burner 31 is provided in the gas supply pipe 32. When the gas valve 33 is fully opened, the supply amount of gas to the gas burner 31 is the largest, and when the gas valve 33 is fully closed, the supply amount of gas to the gas burner 31 is zero.

Therefore, the gas burner 31 can control the strength of the combustion energy by controlling the opening degree of the gas valve 33.

The lower surface near the front surface 10a of the housing 10 is connected to an exhaust passage 50 for exhausting air for drying laundry in the drum 20 from the drum 20 to the outside. The exhaust passage 50 extends downward from the lower surface of the housing 10 and then bends toward the rear of the housing 10, and then further bends upward and extends upward at the rear of the housing 10.

At the rear of the housing 10, a circulation channel 51 that connects the exhaust channel 50 and the inside of the drum 20 is formed inside the exhaust channel 50. The circulation passage 51 is formed so as to branch from the exhaust passage 50, and communicates with the back surface 20 b of the drum 20.

Therefore, the suction channel 30 is connected to the upper part of the back surface 20b of the drum 20, and the circulation channel 51 is connected to the lower part of the back surface 20b of the drum 20. At the back surface 20b of the drum 20, the area of the portion where the suction passage 30 is connected is smaller than the area of the portion where the circulation passage 51 is connected.

Inside the exhaust passage 50, a branch 53 of the exhaust passage 50 and the circulation passage 51 is provided with a ventilator (Ventilator) 53 as an adjustment unit that adjusts the amount of air flowing out of the drum 20 from the exhaust passage 50 The ratio of the amount of air discharged to the outside. The amount of air flowing out of the drum 20 is the amount of air used to dry the laundry in the drum 20.

The ventilator 53 is a partition plate swingable with a branch 52 of the exhaust passage 50 and the circulation passage 51 as a fulcrum. A ventilator motor 53a (FIG. 4) as a stepping motor is connected to the ventilator 53. The ventilator motor 53a rotates according to a pulse signal corresponding to the opening degree supplied from the ventilator control unit 65 (FIG. 4).

Therefore, by calculating the correlation between the opening degree of the ventilator 53 and the number of pulse signals of the ventilator motor 53a in advance, the ventilator 53 can be opened and closed to an arbitrary opening degree. In the ventilator 53 of the present embodiment, the positions of five stages of fully open (100% open), 75% open, 50% open, 25% open, and fully closed (0% open) are switched.

As shown in FIG. 1, when the ventilator 53 is arranged in the fully open position, the ratio of the amount of air discharged from the exhaust passage 50 to the outside among the amounts of air used to dry the laundry in the drum 20 is 100%. That is, the amount of air used to dry the laundry in the drum 20 is exhausted to the outside through the exhaust passage 50.

On the other hand, as shown in FIG. 2, when the ventilator 53 is arranged in the fully closed position, the ratio of the amount of air discharged from the exhaust passage 50 to the outside of the amount of air used to dry the laundry in the drum 20 0%. That is, the amount of air used to dry the laundry in the drum 20 is entirely introduced into the drum 20 through the circulation passage 51.

The ventilator 53 can be in any position between the fully open position shown in FIG. 1 and the fully closed position shown in FIG. 2, so that the amount of air used to dry the laundry in the drum 20 can be exhausted from the air The ratio of the amount of air discharged to the outside of the passage 50 is switched to an arbitrary ratio from 100% to 0%.

For example, as shown in FIG. 3, when the ventilator 53 is configured between the fully open position and the fully closed position, the amount of air used to dry the laundry in the drum 20 is discharged from the exhaust passage 50 to the outside At a position where the ratio of air volume is 25%, 25% of the air volume for drying laundry in the drum 20 is discharged to the outside through the exhaust passage 50, and the air volume for drying laundry in the drum 20 75% is introduced into the drum 20 through the circulation channel 51.

Inside the intake passage 30, an inlet temperature sensor 35 is arranged on the downstream side of the gas burner 31. The inlet temperature sensor 35 detects the drum inlet temperature as the temperature of the air introduced into the drum 20 from the intake passage 30. The inlet temperature sensor 35 uses, for example, a thermistor.

Inside the exhaust passage 50, a filter 55 for removing dust contained in the air is arranged in a portion where the air flowing out of the drum 20 passes, and a fan 56 is arranged on the downstream side of the filter 55.

The fan 56 is connected to a fan motor (FIG. 2), and is driven according to the drive of the fan motor during the drying operation. The fan 56 can be controlled to an arbitrary rotation speed by a fan control unit 66 (FIG. 4) as an inverter.

In the gas dryer 1, when the fan 56 is driven, the air outside the gas dryer 1 forms the following air flow: the air is introduced into the suction passage 30, flows into the drum 20, flows out of the drum 20, and passes The exhaust passage 50 is exhausted to the outside of the gas dryer 1.

Inside the exhaust passage 50, an outlet temperature sensor 57 is arranged on the downstream side of the fan 56. The outlet temperature sensor 57 detects the drum outlet temperature which is the temperature of the air flowing from the drum 20 to the exhaust passage 50. The outlet temperature sensor 57 uses, for example, a thermistor.

In addition, inside the exhaust passage 50, a humidity sensor 58 is arranged on the downstream side of the fan 56. The humidity sensor 58 detects the drum outlet humidity as the humidity of the air flowing from the drum 20 to the exhaust passage 50. The humidity sensor 58 detects relative humidity.

FIG. 4 is a control block diagram of the gas dryer 1 of this embodiment. As shown in FIG. 4, the control unit 60 of the gas dryer 1 is composed of, for example, a microcomputer, etc., and includes a CPU, a ROM that stores a program that controls the operation of the gas dryer 1, and a temporary storage location when the above program is executed. RAM used for data etc. The operation of the gas dryer 1 is controlled by this control unit 60.

The control unit 60 includes a central control unit 61, a gas burner control unit 62, a temperature detection unit 63, a humidity detection unit 64, a ventilator control unit 65, and a fan control unit 66. In addition, a gas valve 33, an inlet temperature sensor 35, an outlet temperature sensor 57, a humidity sensor 58, a ventilator motor 53a, and a fan 56 are connected to the control unit 60.

The central control unit 61 controls all operations of the gas dryer 1.

The gas burner control unit 62 controls the gas valve 33 so that the amount of gas supplied to the gas burner 31 changes.

The temperature detection unit 63 detects the drum inlet temperature of the air introduced into the drum 20 via the inlet temperature sensor 35 and detects the drum outlet temperature of the air flowing out of the drum 20 via the outlet temperature sensor 57.

The humidity detection unit 64 detects the humidity of the drum outlet of the air flowing out of the drum 20 through the humidity sensor 58.

The fan control section 65 controls the fan motor 53a to switch the position of the fan 53.

The fan control unit 66 controls the rotation speed of the fan 56.

Next, the drying operation control of the gas dryer 1 will be described based on FIG. 5. In the gas dryer 1, when a drying operation is performed, a predetermined drying time is set in advance.

<Step S1>

In step S1, the control unit 60 sets the outlet temperature trip T to 0 and the humidity trip H to 0.

<Step S2>

In step S2, the control unit 60 starts the operation of the drum 20 and starts the operation of the fan 56.

<Step S3>

In step S3, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is fully opened.

<Step S4>

In step S4, the control unit 60 fully opens the gas valve 33.

<Step S5>

In step S5, the control unit 60 determines whether the exit temperature trip T is 1 or not.

<Step S6>

In step S5, when the control unit 60 determines that the outlet temperature trip T is not 1, the process proceeds to step S6, and the control unit 60 determines whether the drum outlet temperature is 70°C or higher.

<Step S7>

In step S6, when the control unit 60 determines that the drum outlet temperature is not 70°C or higher, the process proceeds to step S7, and the control unit 60 determines whether the drum inlet temperature is 150°C or higher.

<Step S8>

In step S7, when the control part 60 determines that the drum inlet temperature is not 150 degreeC or more, it progresses to step S8 and the control part 60 determines whether the drying time has passed.

<Step S9>

In step S8, when the control unit 60 determines that the drying time has elapsed, the process proceeds to step S9, and the control unit 60 causes the gas valve 33 to be fully closed.

<Step S10>

In step S10, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is fully opened.

<Step S11>

In step S11, the control part 60 determines whether the drum outlet temperature is 50 degrees C or less.

<Step S12>

In step S11, when the control unit 60 determines that the drum outlet temperature is 50°C or lower, the process proceeds to step S12, and the control unit 60 ends the drying operation.

<Step S13>

In step S5, when the control unit 60 determines that the outlet temperature trip T is 1, the process proceeds to step S13, and the control unit 60 determines whether the drum inlet temperature is 60°C or lower.

<Step S14>

In step S13, when the control unit 60 determines that the drum inlet temperature is not 60°C or lower, the process proceeds to step S14, and the control unit 60 determines whether the humidity trip H is greater than zero. When the control unit 60 determines that the humidity trip H is greater than 0, the process proceeds to step S30 in FIG. 6.

<Step S15>

In step S14, when the control unit 60 determines that the humidity trip H is 0 or less, the process proceeds to step S15, and the control unit 60 determines whether the drum outlet humidity is 80% or more. When the control unit 60 determines that the drum outlet humidity is not 80% or more, the process proceeds to step S7.

<Step S16>

In step S6, when the control unit 60 determines that the drum outlet temperature is 70°C or higher, the process proceeds to step S16, and the control unit 60 sets the outlet temperature trip T to 1, and proceeds to step S16.

<Step S17>

In step S17, the control unit 60 fully closes the gas valve 33. Therefore, in step S6, when the control unit 60 determines that the drum outlet temperature is 70° C. or higher, the air volume used for drying the laundry in the drum 20 is switched to the drum 20 through the circulation channel 51. Therefore, the amount of air introduced into the drum 20 from the air intake passage 30 decreases, so the supply of gas to the gas burner 31 is stopped.

<Step S18>

In step S18, the control part 60 controls the ventilator motor 53a so that the ventilator 53 may be fully closed. Therefore, in step S6, when the control unit 60 determines that the drum outlet temperature is 70° C. or higher, the ventilator 53 is switched so that the amount of air used to dry the laundry in the drum 20 is introduced through the circulation channel 51 to Inside the drum 20. Then, it progresses to step S13.

<Step S19>

In step S13, when the control unit 60 determines that the drum inlet temperature is 60°C or lower, the process proceeds to step S19, and the control unit 60 sets the outlet temperature trip T to 0.

<Step S20>

In step S20, the control unit 60 sets the humidity trip H to 0.

<Step S21>

In step S21, the control unit 60 fully opens the gas valve 33. Therefore, in step S13, when the control unit 60 determines that the drum inlet temperature is 60°C or lower, the gas supply to the gas burner 31 is started.

<Step S22>

In step S22, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is fully opened. Therefore, in step S6, when the control unit 60 determines that the drum outlet temperature is 70°C or higher, the amount of air used to dry the laundry in the drum 20 is all introduced into the drum 20 through the circulation passage 51, and thereafter, In step S13, when the control unit 60 determines that the drum inlet temperature is 60°C or lower, the ventilator 53 is switched so that the amount of air used to dry the laundry in the drum 20 is exhausted to the outside through the exhaust passage 50 . Then, the process proceeds to step S7.

<Step S23>

In step S7, when the control unit 60 determines that the drum inlet temperature is 150°C or higher, the process proceeds to step S23, and the control unit 60 causes the gas valve 33 to be fully closed.

<Step S24>

In step S24, the control part 60 controls the ventilator motor 53a so that the ventilator 53 may be fully closed.

<Step S25>

In step S25, the control part 60 determines whether the drum entrance temperature is 140 degreeC or less. When the control unit 60 determines that the drum inlet temperature is 140°C or lower, the process proceeds to step S8.

<Step S26>

In step S25, when the control unit 60 determines that the drum inlet temperature is not 140°C or lower, the process proceeds to step S26, and the control unit 60 determines whether the drying time has elapsed. When the control unit 60 determines that the drying time has passed, the process proceeds to step S9. When the control unit 60 determines that the drying time has not elapsed, the process proceeds to step S25.

<Step S27>

In step S15, when the control part 60 determines that the drum outlet humidity is 80% or more, it progresses to step S27 of FIG. In step S27, the humidity trip H is set to 1.

<Step S28>

In step S28, the control unit 60 makes the gas valve 33 open 25%. Therefore, in step S15, when the control unit 60 determines that the drum outlet humidity is 80% or more, the ventilator 53 is switched to pass through the exhaust passage 50 among the amount of air for drying laundry in the drum 20 As the ratio of the amount of air discharged to the outside increases, the amount of air introduced into the drum 20 from the air intake passage 30 increases, so the amount of gas supplied to the gas burner 31 increases.

<Step S29>

In step S29, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is turned on at 25%. Therefore, in step S6, when the control unit 60 determines that the drum outlet temperature is 70°C or higher, the amount of air used to dry the laundry in the drum 20 is all introduced into the drum 20 through the circulation passage 51, and thereafter, In step S15, when the control unit 60 determines that the drum outlet humidity is 80% or more, the ventilator 53 is switched to the outside through the exhaust passage 50 among the amount of air for drying laundry in the drum 20 The ratio of the amount of air discharged increases.

<Step S30>

In step S30, the control unit 60 determines whether the drum outlet humidity is (80+H×5)% or more. For example, when the humidity trip H is 1, the control unit 60 determines whether the drum outlet humidity is (80+1×5)=85% or more. When the control unit 60 determines that the drum outlet humidity is not (80+H×5)% or more, the process proceeds to step S31.

<Step S31>

In step S31, the control unit 60 determines whether the drum outlet humidity is 60% or less. When the control unit 60 determines that the drum outlet humidity is not 60% or less, the process proceeds to step S7 in FIG. 5. When the control unit 60 determines that the drum outlet humidity is 60% or less, the process proceeds to step S32.

<Step S32>

In step S32, the control unit 60 sets the humidity trip H to 0.

<Step S33>

In step S33, the control unit 60 makes the gas valve 33 fully closed. Therefore, in step S31, when the control unit 60 determines that the drum outlet humidity is 60% or less, the ventilator 53 is switched so that the amount of air used to dry the laundry in the drum 20 is all introduced into the circulation channel 51 to In the drum 20, the amount of air introduced into the drum 20 from the intake passage 30 decreases, so the supply of gas to the gas burner 31 is stopped.

<Step S34>

In step S34, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is fully closed. Therefore, in step S29, the ventilator 53 is switched to increase the ratio of the amount of air discharged to the outside through the exhaust passage 50 among the amount of air for drying laundry in the drum 20, and then, in step S31 When the control unit 60 determines that the drum outlet humidity is 60% or less, the ventilator 53 is switched so that the amount of air used to dry the laundry in the drum 20 is all introduced into the drum 20 through the circulation channel 51. After that, it proceeds to step S7 in FIG. 5.

<Step S35>

In step S30, when the control unit 60 determines that the drum outlet humidity is (80+H×5)% or more, the process proceeds to step S35, and the control unit 60 increases the humidity trip H by 1. For example, when the humidity trip H is 1, the humidity trip H is increased by 1, and the humidity trip H is set to 2.

<Step S36>

In step S36, the control unit 60 causes the gas valve 33 to be (H×25)% open. For example, when the humidity trip H is 2, the gas valve 33 is set to (2×25)=50% open.

<Step S37>

In step S37, the control unit 60 controls the ventilator motor 53a so that the ventilator 53 is turned on at (H×25)%. For example, when the humidity trip H is 2, the ventilator 53 is set to (2×25)=50% on. Therefore, in step S29, the ventilator 53 is switched to increase the ratio of the amount of air discharged to the outside through the exhaust passage 50 among the amount of air used to dry the laundry in the drum 20, in step S30, the When the controller 60 determines that the drum outlet humidity is (80+H×5)% or more, the drum outlet humidity has not decreased, so the ventilator 53 is switched to the amount of air used to dry the laundry in the drum 20 The ratio of the amount of air discharged through the exhaust passage 50 to the outside further increases. After that, it proceeds to step S7 in FIG. 5.

The gas dryer 1 of the present embodiment includes: a drum 20 containing laundry; an intake passage 30 having a gas burner 31 for introducing air heated by the gas burner 31 to the drum 20; an exhaust passage 50, Used to discharge the air used to dry the laundry in the drum 20 from the drum 20 to the outside; the circulation channel 51 to communicate the exhaust channel 50 with the interior of the drum 20; the ventilator 53 as an adjustment unit is arranged in the exhaust channel Within 50, the ratio of the amount of air discharged from the exhaust passage 50 to the outside among the amount of air flowing from the drum 20 is adjusted; the inlet temperature sensor 35 detects the drum inlet temperature of the air introduced from the suction passage 30 to the drum 20; the outlet The temperature sensor 57 detects the drum outlet temperature of the air flowing from the drum 20 to the exhaust passage 50; the humidity sensor 58 detects the drum outlet humidity of the air flowing from the drum 20 to the exhaust passage 50; and the control unit 60 as a control unit Based on the drum inlet temperature detected by the inlet temperature sensor 35, the drum outlet temperature detected by the outlet temperature sensor 57, and the drum outlet humidity detected by the humidity sensor 48, the ventilator 53 is controlled.

Thus, in the gas dryer 1 of the present embodiment, based on the drum inlet temperature, the drum outlet temperature, and the drum outlet humidity, the amount of air discharged from the exhaust passage 50 to the outside of the amount of air flowing out of the drum 20 Ratio. Therefore, the air introduced into the drum 20 is sufficiently heat-exchanged with the laundry in the drum 20 and then discharged to the outside, so that the drying operation efficiency can be improved.

In the gas dryer 1 of the present embodiment, when the drum outlet temperature detected by the outlet temperature sensor 57 is equal to or higher than the first predetermined temperature, the control unit 60 controls the ventilator 53 so as to reduce the ratio.

As a result, in the gas dryer 1 of the present embodiment, when the amount of air flowing out of the drum 20 is all discharged to the outside from the exhaust passage 50, from the start of drying until the drum outlet temperature reaches the first predetermined temperature So far, the air introduced into the drum 20 and the laundry in the drum 20 have been sufficiently heat-exchanged and then discharged to the outside, but when the outlet temperature of the drum reaches the first predetermined temperature, the air introduced into the drum 20 does not interact with the drum 20 The laundry inside is fully exchanged with heat and discharged to the outside. Therefore, when the drum outlet temperature reaches the first predetermined temperature, the ratio of the amount of air discharged from the exhaust passage 50 to the outside of the amount of air flowing from the drum 20 decreases, so that all or part of the air flowing from the drum 20 The drum 20 circulates. This can prevent the air introduced into the drum 20 from being discharged to the outside without sufficiently performing heat exchange with the laundry in the drum 20.

In the gas dryer 1 of the present embodiment, when the drum outlet temperature detected by the outlet temperature sensor 57 is lower than or equal to the second predetermined temperature lower than the first predetermined temperature, the control unit 60 controls the ventilator 53 to Increase the ratio.

Thus, in the gas dryer 1 of the present embodiment, after the drum outlet temperature reaches the first predetermined temperature, when all or a part of the air flowing out of the drum 20 is circulated into the drum 20, the drum 20 The temperature of the internally circulating air is gradually reduced by heat exchange with the laundry in the drum 20. When the temperature of the drum outlet falls below the second predetermined temperature, the temperature of the air circulating into the drum 20 is too low, and there is little heat exchange with the laundry in the drum 20. Therefore, the ratio of the amount of air discharged from the exhaust passage 50 to the outside of the amount of air flowing out of the drum 20 is increased, and the amount of air circulating in the drum 20 is reduced, so that the temperature of the air in the drum 20 can be increased.

In the gas dryer 1 of the present embodiment, when the drum outlet humidity detected by the humidity sensor 58 is equal to or greater than the first predetermined humidity, the control unit 60 controls the ventilator 53 so that the ratio is increased.

Thus, in the gas dryer 1 of the present embodiment, after the drum outlet temperature reaches the first predetermined temperature, when all or part of the air flowing out of the drum 20 circulates into the drum 20, the air The humidity of the circulating air is gradually increased by drying the laundry in the drum 20. When the humidity at the drum outlet rises above the first predetermined humidity, the humidity of the air circulating into the drum 20 is too high, and the laundry in the drum 20 can hardly be dried. Therefore, the ratio of the amount of air discharged from the exhaust passage 50 to the outside of the amount of air flowing out of the drum 20 is increased, and the amount of air circulating in the drum 20 is reduced, so that the humidity of the air in the drum 20 can be reduced.

In the gas dryer 1 of the present embodiment, when the humidity of the drum outlet detected by the humidity sensor 58 is lower than or equal to the second predetermined humidity below the first predetermined humidity, the control unit 60 controls the ventilator 53 so that The ratio decreases.

Thus, in the gas dryer 1 of the present embodiment, after all or part of the air flowing out of the drum 20 is circulated into the drum 20, when the drum outlet humidity rises above the first predetermined humidity, it decreases The amount of air circulating into the drum 20, and then, when the outlet temperature of the drum drops below the second predetermined humidity, the air circulating into the drum 20 cannot dry the laundry in the drum 20, so the slave drum 20 Among the amount of outflowing air, the ratio of the amount of air discharged from the exhaust passage 50 to the outside is reduced, and the amount of air circulating into the drum 20 is increased, so that the temperature of the air in the drum 20 can be increased.

The gas dryer 1 of the present embodiment includes a gas valve 33 that adjusts the amount of gas supplied to the gas burner 31, and the control unit 60 discharges the gas from the exhaust passage 50 to the outside based on the amount of air flowing out of the drum 20 The gas valve 33 is controlled by the ratio of the air volume.

Thus, in the gas dryer 1 of the present embodiment, when all or part of the air flowing out of the drum 20 is circulated into the drum 20, the amount of air introduced into the drum 20 from the suction passage 30 changes . Therefore, the amount of gas supplied to the gas burner 31 is adjusted according to the amount of air introduced into the drum 20 from the air intake passage 30, thereby reducing gas consumption.

(Second embodiment)

The gas dryer 101 according to the second embodiment of the present invention will be described based on FIG. 7.

The main difference between the gas dryer 101 of the present embodiment and the gas dryer 1 of the first embodiment is that, in the present embodiment, the communication passage 150 is provided to communicate the intake passage 30 and the exhaust passage 50. In the configuration of the gas dryer 101 of the present embodiment, the description of the same configuration as the gas dryer 1 of the first embodiment is omitted.

The gas dryer 101 includes: an intake passage 30 for introducing air into the drum 20; an exhaust passage 50 for discharging air for drying laundry in the drum 20 from the drum 20 to the outside; circulation The passage 51 allows the exhaust passage 50 to communicate with the inside of the drum 20; and the communication passage 150 connects the portion of the intake passage 30 upstream of the gas burner 31 to the exhaust passage 50.

In the gas dryer 101 of the present embodiment, by forming a local circulation path in the intake passage 30 and the exhaust passage 50, a part of the energy discharged from the exhaust passage 50 to the outside can be reused, so that it can be further improved. Efficient drying operation.

However, when the amount of locally circulating air through the communication channel 150 is excessive, incomplete combustion may occur in the gas burner 31. Therefore, with regard to the circulation amount through the communication passage 150, it is necessary to determine in advance the circulation amount in which incomplete combustion does not occur in the gas burner 31.

The embodiment of the present invention has been described above, but the specific configuration of each part is not limited to the above-described embodiment. Other configurations can be variously modified without departing from the gist of the present invention.

Claims (6)

A gas dryer is characterized by: Drum, containing laundry; A suction channel with a gas burner for introducing the air heated by the gas burner to the drum; The exhaust channel is used to discharge the air used for drying the laundry in the drum from the drum to the outside; A circulation channel to connect the exhaust channel and the drum; An adjusting unit, which is arranged in the exhaust passage and adjusts the ratio of the amount of air discharged from the exhaust passage to the outside among the amount of air flowing out of the drum; An inlet temperature sensor, which detects the drum inlet temperature of the air introduced from the suction channel to the drum; An outlet temperature sensor that detects the outlet temperature of the drum of the air flowing from the drum to the exhaust passage; A humidity sensor that detects the humidity of the drum outlet of the air flowing from the drum to the exhaust passage; and The control unit controls the adjustment unit based on the drum inlet temperature detected by the inlet temperature sensor, the drum outlet temperature detected by the outlet temperature sensor, and the drum outlet humidity detected by the humidity sensor. The gas dryer according to claim 1, characterized in that When the drum outlet temperature detected by the outlet temperature sensor is equal to or higher than the first predetermined temperature, the control unit controls the adjustment unit to reduce the ratio. The gas dryer according to claim 2, characterized in that When the outlet temperature of the drum detected by the outlet temperature sensor is lower than or equal to the second predetermined temperature lower than the first predetermined temperature, the control unit controls the adjustment unit to increase the ratio. The gas dryer according to claim 2, characterized in that When the humidity of the drum outlet detected by the humidity sensor is equal to or greater than the first specified humidity, the control unit controls the adjustment unit to increase the ratio. The gas dryer according to claim 4, characterized in that When the humidity of the drum outlet detected by the humidity sensor is lower than the second predetermined humidity lower than the first predetermined humidity, the control unit controls the adjustment unit so that the ratio is reduced. The gas dryer according to any one of claims 1 to 5, characterized in that Equipped with a gas valve that adjusts the amount of gas supplied to the gas burner, The control unit controls the gas valve based on the ratio.

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