JPH062199B2 - Solvent recovery type clothes dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention ignites clothes washed with a petroleum solvent,
The present invention relates to a solvent-recovery-type dryer that prevents the danger of explosion while drying and efficiently recovers the solvent in clothes.

(B) Conventional Technology An example of drying clothes washed with a solvent is disclosed in Japanese Utility Model Laid-Open No. 59-190192. This product releases the solvent gas to the outside when the concentration of the solvent gas during drying rises and there is a danger of ignition and explosion. Especially in the case of drying a petroleum-based solvent, since the flash point of the petroleum-based solvent is as low as 42 ° C., the solvent gas is released from the initial stage of the drying, so that the solvent cannot be recovered at all.

Therefore, in the invention of Japanese Utility Model Application No. 61-83389,
It has been proposed that the exhaust port is closed to dry at a low temperature when the concentration of the solvent gas is high, and the intake port and the exhaust port are opened to dry at a high temperature when the concentration becomes low. This is to dry the solvent at a low temperature in order to recover the solvent without waste, and to safely dry the solvent at a high temperature in order to improve the final drying finish.

(C) Problem to be Solved by the Invention In such a solvent recovery system, it is necessary that the exhaust port is opened and closed accurately. For example, if the exhaust port valve is not closed securely during low-temperature drying operation, dry air with a high solvent concentration will be discharged and the odor of the solvent will be scattered around, or the exhaust of the dry air will prevent sufficient solvent recovery. .

On the other hand, when the exhaust port is closed during high temperature drying operation,
The concentration of the solvent gas becomes high, which may cause ignition, and the odor of the solvent remains on the clothes, which deteriorates the finish of drying. However, in the conventional example, the drying operation is not performed by detecting whether the valve body of the exhaust port has been switched to the open / close state suitable for the low temperature and high temperature drying operation. Therefore, the problems as described above occur.

The solvent recovery type clothes dryer of the present invention solves the above-mentioned problems and attempts to reliably perform abnormality processing when the open / close state of each valve of the intake / exhaust ports is abnormal.

(D) Means for Solving the Problem The solving means according to the present invention is a drying chamber for accommodating clothes washed by a petroleum solvent, and a drying chamber so that the inlet and the outlet of the drying chamber form a substantially sealed state. A recovery tank that is connected and has a cooler that condenses the solvent gas, a heater that is provided between the inlet side of the drying chamber and the cooler and that heats the dry air that enters the drying chamber, and an exhaust port that connects the drying chamber to the outside. An intake port that communicates the recovery tank with the outside, an exhaust valve that opens and closes the exhaust port, an intake valve that opens and closes the intake port, and the dry air is circulated between the drying chamber and the recovery tank, or A fan that inhales outside air from the intake port and exhausts the dry air in the drying chamber from the exhaust port, and the intake valve and the exhaust valve close the intake port and the exhaust port, and the drying chamber through the inlet and the outlet. Communicated with the collection tank State in which the low-temperature drying control unit for performing low-temperature drying work with low-temperature dry air below the flash temperature of the solvent, the intake valve and the exhaust valve open the intake port and the exhaust port, and the outlet is closed And a high-temperature drying control unit for performing high-temperature drying work with a drying air having a high temperature exceeding the flash temperature of the solvent, and performing high-temperature drying work after low-temperature drying work in sequence. And an open / close detection unit that detects the open / closed state of the exhaust port and outputs an open / closed detection signal that enables the drying operation, and an open / close command signal for the intake port and the exhaust port is output from the low temperature / high temperature drying control unit. The abnormality control unit executes an abnormality process when the detection signal from the opening / closing detection means does not arrive within a predetermined time from the time.

Also, the solution means according to the present invention stops the fan until the detection signal from the opening / closing detection means is output within a predetermined time from the time when the opening / closing command signal of the intake port and the exhaust port is output, and the opening / closing detection signal is output. The fan is stopped until the output is output, and a fan control unit that drives the fan when the open / close detection signal is output is added.

(E) Action The low temperature drying operation is performed with the drying chamber connected to the recovery tank and the intake and exhaust valves closing the intake and exhaust ports. When the intake / exhaust port is closed by the intake / exhaust valve, for example, the switch is turned on or off by the valve, the closing of the intake / exhaust port is confirmed by this ON (OFF) signal, and the work is started. .

When the low temperature drying operation is completed, the intake and exhaust ports are opened by the intake and exhaust valve, and the high temperature drying operation is executed with the drying chamber communicating with the outside. At this time, for example, the switch is turned off by the valve.
The FF or ON is turned on, the opening of the intake / exhaust port is confirmed by this OFF (ON) signal, and the work is started. In addition, if a temperature detecting element is placed in the recovery tank away from the intake / exhaust passage, this temperature detecting element will not detect a high drying temperature if the intake / exhaust port is opened correctly, but the open state If it is bad, the high temperature is detected by hitting the leaked high temperature dry air, and the execution of the high temperature drying operation is stopped.

The intake / exhaust valve opens and closes during low-temperature drying work and high-temperature drying work.
It is measured by issuing an (OFF) signal, and if this measurement time exceeds a predetermined time, it is processed as an abnormality. Then, during this predetermined time, the driving of the fan is stopped so that the opening / closing operation of the valve is not disturbed by the wind pressure of the fan.

(F) Embodiments The first embodiment will be described with reference to the drawings. In FIG. 3, the dryer body 1 is divided into upper and lower stages, and a drying chamber (3 ) Is provided, and the recovery tank 4 having a U-shaped passage is provided in the lower stage. An operation body and a control circuit for operating and controlling the dryer are incorporated in the upper front portion of the machine body 1. The outlet 5 of the drying chamber 3 and one end of the recovery tank 4 are connected via a valve chamber 6, and the inlet 7 and the other end of the tank are connected.

A filter 8 and a cooler 9 are sequentially arranged on the outlet 5 side in the recovery tank 4, and an inner bottom portion of the recovery tank 4 is formed in a condensed solvent storage chamber 10. And the entrance 7 in the recovery tank 4
On the side, a fan 11 made of an aluminum fan is provided near the inner bottom.
However, heaters 12 are arranged near the inlets 7, respectively.

A scattering prevention plate 14 made of a punching plate in which a large number of, for example, three through holes 13 ...

The clothes washed by the petroleum solvent are housed in the rotary drum 2, and the fan 11 is rotated at a high speed so that the blowing rate is 20 to 30 m ₃ / min during the low temperature drying operation, and about half the speed during the high temperature drying operation. It is rotated at low speed. Cooler 9
The heater 12 is of a fin tube type, the cooling water is supplied to the cooler 9 through the cooling valve 15, and the steam is supplied to the heater 12 through the steam valve 16. still. The low temperature drying and the high temperature drying may be switched by changing the heat quantity of the heater 12 while keeping the air flow rate constant.

The valve chamber 6 has an exhaust port 17 and an intake port 18, and also has an exhaust valve 19 and an intake valve 20 for 17, 18 respectively. And, in a normal low temperature drying operation, both ports 17,1
8, both valves 19 and 20 are closed and the outlet 5 is communicated with the recovery tank 4, and both valves 19 and 20 open both ports 17 and 18 and valve 19 when deodorizing and high temperature drying work or intake and exhaust work in an emergency. The outlet 5 and the collection tank 4 are cut off.

A drain passage having a drain valve 12 is connected to the storage chamber 10. Further, the temperature detecting element 22 for the dry air is installed near the inlet 7.

The open position of the intake valve 20 is provided with a switch 23 as an open / close detection means that is turned on by contacting the intake valve 20 when it is in this position (when the valve is open). When the switch 23 sucks and the exhaust valves 19 and 20 interlock, they may be provided on the exhaust valve 19 side.

As shown in FIG. 1, the control circuit is mainly composed of a microcomputer (hereinafter, microcomputer) 24.
The microcomputer 24 including U, ROM, RAM and I / O inputs various open / close detection signals from the various keys 25, the temperature detection element 22 and the switch 23, and each load (fan, valve,
(Drum, etc.) 26, display device 27, and notification device 28. For this purpose, the microcomputer 24 constitutes an operation control unit 29, a low temperature drying control unit 30, a high temperature drying control unit 31, a cooldown control unit 32, and an abnormality control unit 33.

As shown in FIG. 2, such a dryer starts operation by operating the start key 25, and the operation control unit 29 operates in the order of low-temperature drying work → deodorizing and high-temperature drying work. In the low temperature drying operation, the low temperature drying control unit 30 rotates the fan 11 at a high speed, starts the operation in the recovery tank 4, and rotates the drum at a low speed. An extremely large amount of dry air is circulated between the drying chamber 3 and the recovery tank 4 at a low temperature of, for example, 40 ° C. as an upper limit. The solvent in the clothes is vaporized and circulates together with the dry air, is cooled by the cooler 9 and condensed, drops, and is accommodated in the accommodation chamber 10 through the through holes 13 of the shatterproof plate 14. Although the solvent in the storage chamber 10 is blown by the strong wind force, it is suppressed by the anti-scattering plate 14 and is not mixed as a droplet in the dry air. At this time, the low temperature drying control unit 30 closes the ports 17 and 18 by the intake and exhaust valves 19 and 20, and the OF from the switch 23.
I am getting the F signal.

During this low-temperature drying operation, the low-temperature drying control unit 30 executes temperature control with an upper limit of 40 ° C. based on the temperature signal from the temperature detection element 22.

For example, when the timer measures the low temperature drying work time of 30 minutes, the operation control unit 29 of the microcomputer 24 shifts the control to the high temperature drying control unit 31. High temperature drying controller 3
1 is the intake / exhaust ports 17, 1 by the external intake / exhaust valves 19, 20.
Open 8. When the valves 19 and 20 are opened to the open position by a torque motor or the like, the intake valve 20 pushes the switch 23 at that position to turn it on. When the valve opening detection signal arrives when the switch is turned on, the high temperature drying control unit 31 rotates the fan 11 at a low speed and closes the cooling valve 15. Then, the outside air is sucked from the intake valve 18, and the outside air is heated by the heater 12 to a temperature of about 60 ° C. and sent to the drying chamber 3. Here, after the clothes are heated to a high temperature to gasify the solvent and improve the finish, dry air is discharged from the exhaust port 19 together with the solvent gas. That is, the deodorizing work and the high temperature drying work are simultaneously performed.

When the deodorizing and high temperature drying work is executed for a predetermined time, the predetermined cooldown work is performed by the cooldown control unit 32.
It is executed by.

The low temperature / high temperature drying control unit 3 is used during the low temperature / high temperature drying operation.
Opening / closing detection signal (O
(N, OFF) does not arrive, the operation control unit 29 causes the abnormality control unit 33 to perform control, the steam valve 16 of the heater 12 is closed, and the display device 27 displays the intake and exhaust valves 19, 20.
Display the abnormality of. Further, the operation control unit 29 is configured to notify the notification device 2 after the operation is normally executed until the cool down.
The end is notified by 8.

Next, a second embodiment will be described with reference to FIGS. The same structures as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, first, the valve chamber 6 is omitted, the outlet 5 of the drying chamber 3 is directly connected to one end of the recovery tank 4, and the exhaust port 17 is formed on the side wall of the drying chamber 3 near the outlet 5. I am doing it. The intake port 18 is formed near the suction port of the fan 11 of the recovery tank 4. The exhaust valve 19 for selectively opening / closing the exhaust port 17 or the outlet 5 and the intake valve 20 for opening / closing the intake port 18 are respectively the torque motor T.
It is driven by M ₁ and TM ₂ . Specifically, the intake and exhaust ports 17 and 18 are closed by the valves 19 and 20 and the outlet 5 is opened during the low temperature drying work, and the intake and exhaust ports 17 and 18 are opened and closed during the high temperature drying work. Is opened and the outlet 5 is closed.

An abnormal high temperature detection element 34 including a thermistor or the like is arranged near the outlet 5 in the recovery tank 4. The abnormal high temperature detection signal from the abnormal high temperature detection element 34 is input to the microcomputer 24 as shown in FIG. 4, and when the signal is input, the abnormality control unit 33 processes the abnormality.

Such abnormality processing is performed by connecting the intake and exhaust ports 17 and 18 to the valves 19 and 2 respectively.
It may be performed during a high temperature drying operation in which a zero command is issued to open. That is, at this time, the outlet 5 is closed, and the abnormal high temperature detection element 34 at the downstream position of the outlet 5 is here.
Detecting an abnormally high temperature means that the hot dry air has flowed into the recovery tank 4 because the exhaust valve 19 opens the outlet 5 and closes the exhaust port 17. That is, the exhaust valve 19 is abnormal.

Therefore, at this time, the abnormality control unit 33 causes the heater 12 to
The steam valve 16 is closed and the display device 27 displays the abnormality of the valve 19.

Note that it is possible to use the switch 23 and the abnormal high temperature detection element 34 together.

Next, the intake and exhaust valves 19 and 2 in the first and second embodiments
A control device that can be added to 0 and the fan 11 will be described as a third embodiment with reference to FIGS. 7 and 8. First, here, for example, a switch 35 that detects opening / closing of the exhaust valve 19 and outputs an opening / closing detection signal is provided. This switch 35 is mechanically turned on by the valve when it is opened, and turned off when it is closed.
The (OFF) signal is input to the microcomputer 24 as a detection signal. In the first embodiment, the switch 23 substitutes for this switch 35.

The microcomputer 24 additionally includes a predetermined time counter 36 that counts a predetermined time of about 6 seconds and a fan control unit 37 that controls driving and stopping of the fan 11.

As shown in the flow chart of FIG. 8, when starting the low temperature drying operation or the high temperature drying operation, the microcomputer 24 commands the intake and exhaust valves 19 and 20 to open or close, and the switch 35
Check the input of open or closed detection signal from. If there are OFF (closed) and ON (open) signals for the valve closing command during the low-temperature drying operation and the valve opening command during the high-temperature drying operation, the fan 11 is driven by the fan controller 37. The fan control unit 37 of the microcomputer 24 removes the factor that hinders the valve operation by stopping the air blow by the fan 11 while the signal is not input. Predetermined time counter 3 of microcomputer 24
6 starts counting for a predetermined time (about 6 seconds) when there is no signal. The abnormality control unit 33 of the microcomputer 24 observes that the counter 36 counts up for a predetermined time, and when the predetermined time elapses, all outputs of the heater 12 and the like are stopped, and a valve abnormality is displayed on the display device 27. To let you know.

Normally, the opening / closing operation of each valve 19, 20 can be executed in 2 to 3 seconds. During this time, the blowing of the fan 11 is stopped to ensure the operation of the valves 19, 20. When the process is not completed (the detection signal is not input), it is processed as an abnormal valve operation.

Although the flow chart of FIG. 8 omits the characteristic operation in the first and second embodiments, it can be used as an additional control specification in the first and second embodiments. You can

(G) Effect of the Invention According to the present invention, when performing a low temperature drying operation or a high temperature drying operation, the opening / closing detecting means detects the opening / closing operation of the intake / exhaust valve suitable for each drying operation and the drying operation is performed. The opening / closing detection signal of the opening / closing means can appropriately respond to the abnormal opening / closing operation.

In addition, the ventilation of the fan is stopped until the detection signal from the opening / closing detection means is output, so the opening / closing operation of the valve is not obstructed by the wind pressure of the fan and the operation is reliable. A solvent recovery type clothes dryer having a good rate can be provided.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a first embodiment for drying clothes according to the present invention, and FIG. 2 is a flow chart for explaining the same operation,
3 is a sectional view showing the internal mechanism, FIG. 4 is a view corresponding to FIG. 1 in the second embodiment, FIG. 5 is a view corresponding to FIG. 2, and FIG. 6 is a view corresponding to FIG. FIG. 7 is a view corresponding to FIG. 1 in the third embodiment, and FIG. 8 is a view corresponding to FIG. 3 ... Drying room, 4 ... Recovery tank, 11 ... Fan, 19, 20 ...
Intake and exhaust valves, 23 ... Switches, 24 ... Microcomputer, 30 ...
Low temperature drying control unit, 31 ... High temperature drying control unit, 33 ... Abnormality control unit, 34 ... Abnormal high temperature detection element, 35 ... Switch, 36
... predetermined time counter, 37 ... fan controller.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Hotta 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) References JP 59-179872 (JP, A)

Claims (2)

[Claims] 1. A recovery chamber having a drying chamber for accommodating clothes washed with a petroleum solvent, and a cooler for condensing solvent gas, which is connected to the drying chamber by an inlet and an outlet of the drying chamber so as to be substantially sealed. A tank, a heater provided between the inlet side of the drying chamber and the cooler, for heating dry air entering the drying chamber, an exhaust port for communicating the drying chamber with the outside, and an intake port for communicating the recovery tank with the outside. An exhaust valve that opens and closes the exhaust port, an intake valve that opens and closes the intake port, and circulates the dry air between the drying chamber and the recovery tank, or sucks outside air from the intake port to dry the drying chamber. A fan that exhausts the air from the exhaust port and the intake port and the exhaust port are closed by the intake valve and the exhaust valve, and the solvent is ignited while the drying chamber and the recovery tank are in communication with each other through the inlet and the outlet. Drying at low temperature below temperature By the low temperature drying control section for executing the low temperature drying work by the above, and the high temperature drying air which exceeds the flash temperature of the solvent with the intake port and the exhaust valve opening the intake port and the exhaust port and closing the outlet. A high-temperature drying control unit that performs high-temperature drying work, and in which the high-temperature drying work is sequentially performed after the low-temperature drying work,
An opening / closing detection unit that detects the opening / closing state of the intake port and the exhaust port by the intake valve and the exhaust valve and outputs an opening / closing detection signal that enables the drying operation, and the opening / closing command signal of the intake port and the exhaust port are the low temperature. A solvent recovery type clothes dryer including an abnormality control unit that executes an abnormality process when a detection signal from the opening / closing detection unit does not arrive within a predetermined time after being output from the high temperature drying control unit. 2. The fan is stopped and the opening / closing detection signal is output until the detection signal from the opening / closing detection means is output within a predetermined time from when the opening / closing command signal of the intake port and the exhaust port is output. The solvent recovery type clothes dryer according to claim 1, further comprising: a fan control unit that drives a fan.