JPH06205892A - Dryer for clothing - Google Patents

Abstract

PURPOSE:To enable safe drying in a short time even if clothing cleaned by solvent is additionally cast in temporary stoppage of drying running. CONSTITUTION:A circulating path 3 for circulating drying blast by a blower 5 is disposed in a drum 2 receiving clothing. A heater 7 for heating the drying blast and a condenser 6 for condensing solvent from the drying blast are disposed in the circulating path 3. An inlet temperature sensor 22 and outlet temperature sensor 23 are disposed in the circulating path 3. A comparator for comparing a temperature signal of the outlet temperature sensor 23 with the flash point temperature of the solvent, a key board for controlling the running operation, a door switch for detecting the opening and closing conditions of the door in drying running and a controlling means for controlling the operations of the blower 5, heater 7 and condenser 6 are provided together. The controller means stops the operation of the heater 7 to resume the drying running when the door switch is operated during drying running and the outlet 3b has a temperature higher than the flash point temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer for drying clothes washed with a petroleum-based flammable solvent.

[0002]

2. Description of the Related Art In a conventional clothes dryer of this type, the temperature of the dry air supplied into the drum is controlled by a temperature sensor at the drum inlet.
The heater and the blower are controlled so as to be lower than the ignition temperature of the flammable solvent, and the heater is controlled to be turned on and off in order to keep the temperature of the dry air at a predetermined temperature. As an example, Japanese Patent Publication No. 3-8797 (D0
6F43 / 08).

Further, Japanese Patent Application No. 4-209143 (D
06F43 / 08) determines the concentration of solvent gas evaporated from clothes by the temperature difference between the inlet and outlet of the drum and controls the concentration within the safe gas concentration, and also determines the temperature difference between the inlet and outlet temperatures of the drum as the safe temperature. It keeps the difference and controls. Then, when the solvent gas concentration becomes thin, the set temperature of the inlet and outlet temperatures of the drum is gradually increased and controlled so as to maintain a safe temperature difference, and the drying control is shown in which the outlet temperature is gradually made higher than the flash point temperature. There is.

[0004]

However, in the case of drying clothes washed with such a flammable solvent, in the former conventional example, the temperature at the inlet of the drum is controlled to be below the flash point temperature. It is safe because it is dried at a low temperature, but there is a problem that the drying time is long and the running cost is high.

In the latter conventional example, the temperature is controlled within the safe gas concentration while keeping the safe temperature difference. Therefore, it is good not to add the dried product, but it is temporarily stopped during the drying operation and after the cleaning, When additional clothes are added to the drum and dried, the solvent content rapidly evaporates from the undried clothes, the concentration of solvent gas in the drum suddenly rises above the explosion lower limit concentration, and the drum outlet temperature is the flash point temperature. It is dangerous because it is above.

The present invention solves the above-mentioned problems, and has a low running cost, and is to safely and quickly dry even if an additional dry substance is added during the drying operation.

[0007]

The first technical means of the present invention is to provide a drum for containing clothes washed with a flammable solvent, a circulation path for returning the dry air in the drum to the drum again by a blower, A heater installed in the circulation path to heat the dry air, a condenser to condense the solvent from the dry air, a drum inlet temperature sensor to detect the temperature of the dry air before drying, and a dry air temperature after drying. A drum outlet temperature sensor for detecting the
A comparator for comparing the temperature signal from the outlet temperature sensor with the flash point temperature of the solvent, a keyboard for inputting a drying operation by key operation, and opening and closing of the drum door. A door switch for detecting the state of formation, and a control means for controlling the operations of the blower, the heater, the condenser and the like, the control means including a release signal and a closing signal from the door switch during the drying operation. When a signal higher than the flash point temperature is input from the comparator, the operation of the heater is stopped until the signal becomes lower than the flash point temperature.

According to a second technical means of the present invention, the control means is
When the release signal and the closing signal from the door switch are input, the set temperature of the inlet temperature sensor is changed to a predetermined safe temperature for control.

[0009]

In other words, according to the first technical means, even if the clothes washed during the drying operation are additionally put into the drum and then re-dried, the dry air is not heated until the outlet temperature of the drum becomes below the flash point temperature. The drying operation is restarted by suppressing the evaporation of the solvent and increasing the concentration of the solvent gas.

Further, according to the second technical means, when the clothes washed during the drying operation are added to the drum and re-operated, the set value of the inlet temperature sensor is changed to a predetermined safe temperature and the drying operation is performed. The temperature of the drying air is rapidly suppressed after the operation of the heater is restarted, and the rapid increase of the solvent gas concentration is prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a storage tank fixed in the machine frame, 2 is a drum provided in the storage tank 1, which is rotatably disposed by a drive motor (not shown), and a large number of drums are provided on the peripheral wall of the drum 2. Through holes are provided. Reference numeral 3 is a circulation path that connects an inlet 3a provided above the storage tank 1 and an outlet 3b provided below the storage tank 1, and dry air is circulated during the drying process. In the circulation path 3, a lint filter-4, a blower 5, a condenser 6, and a heater 7 are arranged in this order from the outlet 3b side. Cold water is supplied to the condenser 6 from a cooling pipe 8, and 9 is a water supply valve provided in the cooling pipe 8. Reference numeral 10 is a steam pipe for sending steam to the heater 7. The steam pipe 11 has a steam valve 11 at the steam inlet and a steam exhaust valve 12 at the steam outlet.
Temperature control.

Numeral 13 is a partition wall for blocking the space between the blower 5 and the condenser 6 in the circulation passage 3, and a communication hole.
Have 14. Reference numeral 15 denotes a shield wall that shields the condenser 6 and the heater 7 from each other in the circulation path 3, and has a communication hole 16.

Reference numeral 17 denotes an intake duct for introducing outside air from between the condenser 6 and the heater 7 in the circulation path 3, which is opened and closed by an intake valve 18. The intake valve 18 opens the intake duct 17 and closes the communication hole 16 at the same time. Reference numeral 19 denotes an exhaust duct for exhausting air from between the blower 5 and the condenser 6 to the outside of the circulation path 3, which is opened and closed by an exhaust valve 20. The exhaust valve 20 opens the exhaust duct 19 and closes the communication hole 14 at the same time. Reference numeral 21 denotes a water separator communicating with the lower side of the condenser 6, which collects the solvent condensed in the condenser 6 and separates it into water and solvent, and collects only the solvent.

Reference numeral 22 is an inlet temperature sensor consisting of a heater 7 and a negative characteristic thermistor mounted on the circulation path 3 near the inlet 3a of the storage tank 1, and 23 is a negative characteristic sensor mounted on the outlet 3b of the storage tank 1. An outlet temperature sensor consisting of a mister detects the temperature at each location.

Reference numeral 24 denotes a micro computer (hereinafter referred to as a microcomputer) which serves as control means, and is input through a keyboard 34 composed of various operation key groups as shown in the block circuit diagram of FIG. Based on the data, the drive motor 35 and the blower 5 are drive-controlled to execute the drying process. In the drying process, the opening and closing of the intake valve 18 and the exhaust valve 20 are controlled, and the condenser 6 and the heater 7 are controlled based on the temperatures detected by the inlet temperature sensor 22 and the outlet temperature sensor 23 of the drum 2. The timing of each of these operations is set through the keyboard 34, and the setting contents and other operations are displayed on the display device 36. When the door switch 37 is operated during the drying process, the temperature sensors on the inlet side and the outlet side of the drum 2
Control of heater 7 and inlet temperature sensor 22
It is designed to control the set temperature of.

3 to 4 are flow charts showing the drying procedure of the clothes dryer according to the present invention. At the start of drying of the dryer, the set value of the inlet temperature sensor 22 is set to, for example, 50 ° C. as a predetermined safety temperature. The temperature of the outlet is controlled below the flash point (40 ° C), and the temperature difference between the inlet and the outlet of 10 ° C is used as the safe temperature difference to control the temperature and perform the drying operation. Then, the blower motor 5 and the drive motor 35
Is turned on (S-1). The water supply valve 9 is opened, and the condenser 6 starts the condensation of the solvent from the dry air circulating in the circulation path 3 (S-
2) At the same time, the intake valve 18 and the exhaust valve 20 are closed.

The outlet temperature sensor 23 compares whether the outlet temperature of the drum 2 is below the flash point temperature (40 ° C.) of the solvent (S-3). When the outlet temperature of the drum 2 is lower than the flash point temperature, the temperature of the inlet 3a detected by the inlet temperature sensor 22 is compared with the inlet temperature set value of 50 ° C. or lower. 7 steam valve 11 and exhaust valve 12
Is opened and heating is started by the heater 7. When the temperature is higher than 50 ° C., the exhaust valve 12 is closed to stop heating. In this heating control, the accuracy of temperature control is enhanced by the combination of opening and closing control of the steam valve 11 and the exhaust valve 12 (S-4).

The temperature at the inlet 3a of the drum 2 and the outlet 3
The temperature difference from the temperature of b is 10
If the temperature difference is gradually decreased and reaches 8 ° C (S-5), increase the set value of the inlet temperature sensor-22 by 2 ° C each time. Change the settings. Then, it is compared whether or not the drying set time has been reached (S-6). If the drying operation is continued without the door switch 37 being turned off without being temporarily stopped during the drying setting time, the above control is performed. Repeat (S-7).

After the drying set time has passed, the steam valve 11 of the heater 7 is closed to stop the heating, the intake valve 18 and the exhaust valve 20 are opened (S-8), and the outside air is sucked into the drum 2 and the drum 2
From outside the machine. Then, the cool down is performed until the cool down stroke time (for example, 10 minutes) for lowering the temperature of the dried clothes elapses (S-9), and when the cool down stroke time elapses, the water supply valve of the condenser 6 is reached. 10 is closed and the drive motor 35 for the blower motor 5 and the drum 2 is stopped (S-1
0), finish the drying.

The door of the drum 2 is opened in order to add the dried material to the drum 2 during the drying operation. At this time, since the door switch 37 is turned off, the water supply valve 10 of the condenser 6, the steam valve 11 and the steam exhaust valve 12 of the heater 7 are closed. Then, the blower motor 5 and the drive motor 35 for the drum 2 are also stopped (S-1).
1). When the addition of dry matter has been completed and the door is closed, the door switch 37 is turned on again. If the predetermined time before the ON operation is within 30 seconds, for example, it is input as a temporary stop for additional charging, and the drying operation is restarted (S-12). Then, as with the start of drying, it is compared whether the temperature of the outlet 3b of the drum 2 is below the flash point temperature, and when it is below the flash point temperature, the heater 7 is turned on and heating control is performed. Then, the inlet set temperature is the predetermined safe temperature (50
The temperature is controlled by changing the setting to (° C).

As described above, when the dry matter is additionally charged, the heating start by the heater 7 is postponed until the temperature of the outlet 3b of the drum 2 becomes equal to or lower than the flash point temperature, and the solvent gas concentration becomes lower than the explosion lower limit concentration. It holds safely so that it does not exceed 0.6%. Even if the heater 7 starts heating, the inlet set temperature is changed to a predetermined safe temperature (50 ° C) and the drying operation is continued, so additional dry matter is added even if added. The temperature of the dry air can be controlled while maintaining the safe temperature difference as before the introduction, and it is possible to prevent a sharp rise in solvent gas concentration, which is safe.

As another embodiment of stopping the drum 2 when the washed clothes are additionally charged during the drying operation, instead of pausing at the release signal and the closing signal from the door switch, the keyboard is used. It is also possible to separately provide a temporary stop key at 34 and to control the additional charging when a signal from the temporary stop key is input.

[0024]

EFFECTS OF THE INVENTION According to the present invention, even after the washing operation is temporarily stopped during the drying operation and the washed clothes are additionally charged and the drying operation is continued again, the drying is performed until the temperature at the outlet portion of the drum becomes the flash point temperature or less. Since the drying operation is restarted without heating the air, it is possible to prevent the solvent gas concentration in the drum from rapidly increasing and to safely continue the drying operation within the safe gas concentration.

Further, after the temporary stop, the inlet temperature sensor-
Since the set value of is changed to the specified safe temperature and the drying operation is restarted, the safe temperature difference can be easily maintained, and the rise in the outlet temperature can be suppressed to prevent the solvent gas concentration from rising early. Since the temperature can be controlled, it is possible to dry safely and quickly even if it is added.

Further, after the temporary stop, the inlet temperature sensor-
Since the set value of is changed to a predetermined safe temperature and the drying operation is restarted, the temperature of the drying air can be suppressed sharply after the start of operation of the heater, and temperature control can be performed to prevent a sharp increase in solvent gas concentration. A safe temperature difference can be maintained.

[Brief description of drawings]

FIG. 1 is a schematic front sectional view of a clothes dryer according to the present invention.

FIG. 2 is a block diagram of a control mechanism.

FIG. 3 is a flowchart showing a process of a drying process.

FIG. 4 is a flowchart showing the processing steps subsequent to FIG.

[Explanation of symbols]

 2 Drum 3 Circulation path 5 Blower 6 Condenser 7 Heater 18 Intake valve 20 Exhaust valve 22 Inlet temperature sensor-23 Outlet temperature sensor-24 Microcomputer 34 Key board 35 Drive motor 36 Display 37 Door switch

Claims (2)

[Claims] 1. A drum for containing clothes washed with a flammable solvent, a circulation path for returning the dry air in the drum to the drum again by a blower, and a heater arranged in the circulation path for heating the dry air. And a condenser that condenses the solvent from the dry air,
A drum inlet temperature sensor for detecting the temperature of the drying air before drying, a drum outlet temperature sensor for detecting the drying air temperature after drying, and a temperature signal from the outlet temperature sensor and the flash point temperature of the solvent. A comparator for comparing the above, a keyboard for inputting a dry operation by a key operation, a door switch for detecting the open / closed state of the door of the drum, the blower, the heater and the condenser. And a control means for controlling the operation of the vessel and the like, and the control means receives a release signal and a closing signal from the door switch during the dry operation and a signal higher than the flash point temperature from the comparator. At this time, the clothes dryer is characterized in that the operation of the heater is stopped until the temperature becomes lower than the flash point temperature. 2. The control means is such that when the release signal and the closing signal from the door switch are input, the inlet temperature sensor-
The clothes dryer according to claim 1, wherein the set temperature of the clothes dryer is changed to a predetermined safety temperature for control.