JPH06154492A - Clothes drying machine - Google Patents

Abstract

PURPOSE:To provide a clothes drying machine which does not stop frequently because of actuation of a safety thermostat or a thermocouple for prevention of over-heating, even though the operation is retardant, in case where such a thermostat or thermocouple is actuated to stop the operation and the wash is left half dried or where the operation takes place under the marginal service conditions. CONSTITUTION:A clothes drying machine is equipped with a controller 12 which continues operation upon changing over into the low output operation in case the predetermined value is exceeded by the wind quantity or temp, fed from an exhaust wind quantity sensor 10 or blowout warm wind temp. sensor 11, and which stops the operation in case the set value for safety is exceeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer driven by gas as a heat source.

[0002]

2. Description of the Related Art In a conventional clothes dryer, clothes are put in a drum 1 rotated by a motor 2 as shown in FIG. 2, and warm air generated by a gas burner 3 is blown into a drum 1 from a warm air outlet 4. The clothes are dried by this heat, and the exhaust air (moisture exhaustion) is exhausted from the inside of the drum 1 by the fan 6 through the filter 5 to the outside through the exhaust port 7 and the duct 8. . In this conventional clothes dryer, the temperature near the gas burner 3 rises when the exhaust resistance becomes large or when the filter 5 is clogged with lint, so this temperature is used for safety. A safety device is added to detect the thermostat 9 to stop the operation and issue an alarm.

[0003]

However, the clothes dryer with the security device has the following drawbacks. a. If you stop while driving, the laundry will remain dry and inconvenient. b. In the case where the clothes dryer is installed under the specified conditions, even a slight amount of lint may adhere to the filter 5, which may cause exhaust resistance to exceed the standard and prevent frequent operation. c. Although the installation conditions are slightly above the standard, it cannot be installed even if there is no particular problem in terms of safety measures.

An object of the present invention is to eliminate the drawbacks described in a, b and c in a clothes dryer.

[0005]

The construction of the clothes dryer according to the present invention is as follows.

1. An exhaust air volume detection sensor is installed to detect the exhaust air volume discharged via the exhaust port.If the air volume detected by this exhaust air volume detection sensor falls below a preset air volume, the combustion amount of the gas burner will be reduced. A clothes dryer that is equipped with a control circuit that lowers and continues operation.

2. A blow-out warm air temperature detection sensor is attached to the outlet for blowing warm air into the drum, and if the temperature of the warm air detected by this blow-out warm air temperature detection sensor rises above a preset temperature, the gas burner A clothes dryer with a control circuit that reduces the amount of combustion and continues operation.

If the exhaust air volume falls below a preset air volume, or if the temperature of the blown hot air rises above a preset temperature, the combustion amount of the gas burner is reduced and at the same time an alarm such as a lamp or buzzer is issued. Is issued to inform the user that an alarm or low-power operation is being used.

Next, the control of the combustion amount of the gas burner may be performed by a method of proportionally controlling in accordance with the decrease of the exhaust air volume or the blowing hot air temperature, a method of stepwise control, and the like. Is possible.

[0010]

When the clothes dryer is operated and the filter is clogged or the resistance in the exhaust duct becomes large, the exhaust resistance increases, and the air volume detected by the exhaust air volume detection sensor decreases. Alternatively, the temperature of the blown hot air detected by the blown hot air temperature detection sensor rises at the hot air outlet. When these changes exceed the preset reference value, the combustion amount of the gas burner is reduced and the low output operation is first switched to. At the same time as this operation switching, an alarm lamp or a buzzer is driven to notify the user. As a result, it is possible to finish at least what is currently being dried. If the exhaust air volume further decreases or the temperature of the blown hot air rises while continuing this low output operation, a safety thermostat or an overheat prevention thermocouple as an example of a safety device is activated. Stop driving.

[0011]

EXAMPLE FIG. 1 shows an example of the present invention. 1 is a motor 2
The drum is rotated by the door 1a on the front side.
Is attached, and clothes can be taken in and out from here. 3 is a gas burner, and gas is supplied to this gas burner 3 via a gas line 3a. 3b is a proportional control valve attached to the gas line 3a, 4 is a hot air outlet for blowing hot air heated by the gas burner 3 into the drum 1, 5 is a filter attached to the rear of the drum 1, and 6 is exhaust. Fan, 7 exhaust port, 8 exhaust duct, 9
Is a safety thermostat or a thermocouple for preventing overheating, and when this safety thermostat or thermocouple 9 detects a temperature equal to or higher than a preset temperature, the solenoid valve 9a attached to the gas line 3a operates to stop the gas.

Reference numeral 10 is an exhaust air flow rate detection sensor attached to the exhaust port 7, 11 is a blown hot air temperature detection sensor attached to the blowout port 4, and 12 is a controller for performing the following control.

When the clothes dryer is operating and the resistance increases due to clogging of the filter 6 or lint adhering to the inside of the exhaust duct 8, for example, the exhaust air flow rate detection sensor 10
The amount of air detected at is reduced. Alternatively, the temperature of the blown hot air detected by the blown hot air temperature detection sensor 11 rises. If these changes exceed a preset reference value, the combustion amount of the gas burner 3 is reduced by driving the proportional control valve 3b, and the low output operation is first switched. At the same time as this operation switching, an alarm lamp or a buzzer is driven to notify the user. As a result, it is possible to finish at least what is currently being dried to the end. When the low output operation is continued and the exhaust air volume further decreases or the temperature of the blown hot air rises, the operation is stopped for safety. The operation stop for safety is performed by the action of the safety thermostat or the overheat prevention thermocouple 9.

[0014]

The present invention is constructed as described above and has the following effects. a. If the exhaust air volume decreases or the temperature of the hot air blown out rises during normal drying operation, you can switch to low-output operation once instead of stopping the operation suddenly, and continue the operation. Never leave. b. When the exhaust conditions and the like are used at the limit of the installation conditions, the clothes dryer may be used as it is, although the output may be switched to a low output, which is convenient. c. Even if the installation conditions are not slightly satisfied, the operating time will be somewhat longer, but it can be installed and used as it is.

[Brief description of drawings]

FIG. 1 is an explanatory view of a clothes dryer that embodies the present invention.

FIG. 2 is an explanatory view of a conventional clothes dryer.

[Explanation of symbols]

1 Drum 2 Motor 3 Gas burner 4 Air outlet 5 Filter 6 Fan 7 Exhaust port 8 Duct 9 Safety thermostat or thermocouple for overheat prevention 10 Exhaust air flow detection sensor 11 Hot air temperature detection sensor 12 Controller

Claims (5)

[Claims] 1. An exhaust air volume detection sensor for detecting an exhaust air volume discharged through an exhaust port is attached, and when the air volume detected by this exhaust air volume detection sensor falls below a preset air volume, A clothes dryer that includes a control circuit that reduces the amount of gas burner combustion and continues operation. 2. A blowing hot air temperature detection sensor is attached to an outlet for blowing warm air into the drum, and the temperature of the warm air detected by the blowing hot air temperature detection sensor rises above a preset temperature. In this case, the clothes dryer is provided with a control circuit for reducing the combustion amount of the gas burner and continuing the operation. 3. When the exhaust air volume falls below a preset air volume or when the temperature of the blown hot air rises above a preset temperature, the combustion amount of the gas burner is reduced and an alarm is issued at the same time. The clothes dryer according to claim 1, wherein 4. The clothes dryer according to claim 1, wherein the combustion amount of the gas burner is proportionally controlled according to the decrease of the exhaust air amount or the temperature of the blown hot air. 5. The clothes dryer according to claim 1, wherein the combustion amount of the gas burner is configured to be controlled stepwise in accordance with a decrease in exhaust air volume or blown hot air temperature.