JP2994910B2 - Dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer for drying laundry washed with a solvent.

[0002]

2. Description of the Related Art In a conventional dryer disclosed in Japanese Patent Publication No. 3-8797, when washing laundry washed with a petroleum-based solvent, air is circulated in the order of a heater, a drying chamber, and a cooler. . Under this circulation, hot air is generated in the heater, and the hot air evaporates the solvent from the laundry. Then, the hot air is cooled by the cooler, and the solvent evaporated from the laundry is recovered.

At the start of such a drying operation, if the temperature in the drying chamber is considerably high due to the residual heat of the previous drying, etc., the laundry contains a large amount of solvent after washing, and the solvent gas becomes abnormal. Occurs and is dangerous.

In addition, when the drying operation is interrupted and laundry is added to the drying room and the drying operation is restarted, the laundry containing a large amount of solvent is added when the temperature in the drying room is already considerably high. Similarly, the solvent gas is abnormally generated, which is dangerous.

On the other hand, if the temperature in the drying chamber at the start of the drying operation is low, the heater is driven when the drying operation is performed.
Because of the stop control, the temperature in the drying room does not rise easily,
It takes a long time for drying, and the drying efficiency is poor.

[0006]

SUMMARY OF THE INVENTION According to the present invention, control is performed in accordance with the temperature in a drying chamber to prevent a solvent gas from being abnormally generated and becoming dangerous, and to prevent a decrease in drying efficiency. It is intended to provide a dryer.

[0007]

According to the present invention, there is provided a drying chamber for storing solvent-washed laundry, a heater, a cooler, and a heater, a drying chamber, and a cooler. A blower for sequentially circulating the wind is provided, and under the circulation, hot air is generated by the heater, the solvent is evaporated from the laundry by the hot air, and then the hot air is cooled by the cooler and evaporated from the laundry. In the dryer for performing the drying operation for recovering the dried solvent, a comparison is made between the drying room temperature sensor for detecting the temperature in the drying room and the detected temperature of the drying room temperature sensor before the drying operation is started. Means and this ratio
Comparison means that the detected temperature is lower than the predetermined temperature.
When the fruits are obtained, the heater is operated to start the drying operation.
Means for starting , when a comparison result that the detected temperature is higher than a predetermined temperature is obtained by the comparing means, prior to the start of the drying operation, by driving the cooler and the blower in a stopped state of the heater. Cooling air circulating means for circulating cooling air.

Further, according to a second aspect of the present invention, in the basic dryer, the temperature of the hot air introduced into the drying chamber is adjusted.
Hot air temperature sensor to detect the temperature inside the drying chamber
A drying chamber temperature sensor to be known, an interrupting means for interrupting the drying operation by opening a door of the drying chamber, and the like. Cooling air circulating means for driving the cooling air to circulate the cooling air;
Hot air temperature detected by the temperature sensor and the drying room temperature sensor
Based on the temperature difference from the detected drying room temperature,
Solvent gas concentration should be kept below the lower explosive limit
Means for controlling the operation of the heater .

In the above-mentioned basic dryer, the drying chamber temperature sensor for detecting the temperature in the drying chamber, and the temperature detected by the drying chamber temperature sensor before the start of the drying operation may be a predetermined temperature. When a comparison result that the detected temperature is lower than the predetermined temperature is obtained by the comparing means, and before the drying operation is started, the heater is driven to reduce the detected temperature to near the predetermined temperature. Heater control means to be reached, after execution of this heater control means,
The solvent concentration in the drying chamber was maintained below the lower explosive limit concentration.
Means for controlling the operation of the heater so as to be operated .

[0010]

According to the first aspect of the present invention, when the drying operation is started, if the temperature in the drying chamber is considerably high due to the residual heat of the previous drying, etc., the comparison result indicates that the detection temperature of the drying chamber temperature sensor is higher than a predetermined temperature. Is obtained. Then, prior to the start of the drying operation, the cooler and the blower are driven with the heater stopped, and the cooling air circulates in the drying chamber. This circulation cools the drying chamber. Thereafter, the drying operation is started. However, the state in which the temperature in the drying chamber is high has been eliminated, and the solvent gas does not abnormally occur.

In the second aspect of the present invention, after the drying operation is interrupted, before the drying operation is restarted, the cooler and the blower are driven with the heater stopped, and the cooling air circulates in the drying chamber to dry the drying operation. The room is cooled. When the drying operation is interrupted, the door is opened and laundry is added, and immediately thereafter, when the drying operation is restarted, the solvent gas is abnormally generated because the temperature in the drying chamber is high. However, as described above, the drying chamber is cooled prior to restarting the drying operation,
No solvent gas is abnormally generated.

In the configuration of the third aspect, when a comparison result indicating that the temperature in the drying chamber is lower than the predetermined temperature is obtained at the start of the drying operation, the heater is driven prior to the start of the drying operation, and the drying chamber is driven. The temperature rises to near a predetermined temperature. Thus, the drying operation is started when the temperature in the drying chamber is at an appropriate height, and the drying time is reduced.

[0013]

1 and 2 show the structure of a commercial dryer according to an embodiment of the present invention. 1 is a dryer main body, 2 is this dryer main body 1
A drying chamber 3 formed therein is a rotating drum rotatably disposed in the drying chamber 2, into which laundry washed with a petroleum-based solvent with the door 3 a opened is put. Is done. The rotary drum 3 has a cylindrical shape and has a large number of ventilation holes in a peripheral wall. Reference numeral 4 denotes a drum motor for driving the rotary drum 3.

Reference numeral 5 denotes an intake port provided on the upper part of the dryer main body 1, and reference numeral 6 denotes a heater connected to a lower side of the intake port 5. The heater 6 includes a steam pipe 9 having steam valves 7 and 8 and connected to a steam generation source (not shown). 10 is an introduction path connecting the heater 6 and the drying chamber 2;
Is a discharge passage connected to the lower portion of the drying chamber 2, 12 is a blower connected to the discharge passage 11, and 13 is a blower 12
A communication path connected to the rear side of the dryer main body 1;
Reference numeral 14 denotes an end of the communication path 13 and an exhaust port provided at an upper portion of the main body 1 of the dryer.

Reference numeral 15 denotes a circulation path provided on the upper portion of the dryer main body 1 so as to connect the heater 6 and the vicinity of the upper side of the communication path 13, and reference numeral 16 denotes a cooler disposed in the circulation path 15. . The cooler 16 has a cooling valve 17 and the refrigerator 1
The cooling pipe 19 is connected to the cooling pipe 19. Reference numeral 20 denotes a switching means, that is, a switching valve which selectively moves to a solid line position for closing the intake port 5 or a dashed line position for opening.

When the switching valve 20 moves to the position indicated by the solid line, a circulation drying path is formed. That is, when the steam valves 7 and 8 are opened, steam flows through the steam pipe 9 to operate the heater 6, and when the cooling valve 17 is opened, refrigerant flows through the cooling pipe 19 and the cooler 16 is opened. When the blower 12 is driven in the operating state, the air blows from the circulation path 15 to the heater 6 to generate hot air. The hot air is guided by the introduction path 10 and enters the drying chamber 2 to dry the laundry in the rotating drum 3. The solvent evaporates from the laundry by this drying, and the hot air contains the solvent gas. On the other hand, hot air is deprived of heat. Then, the hot air is discharged to the discharge path 1
1. Through the blower 12 and the communication path 13, it reaches near the upper part of the communication path 13. At this point, the hot air is drawn into the circulation path 15 under the influence of the flow of air from the circulation path 15 to the heater 6. Then, the hot air is actively cooled by the cooler 16, and the solvent gas is condensed to recover the solvent. Thus, the heater 6, the drying chamber 2, the cooler 16
The solvent is collected and dried while hot air is circulated in the following order. In the drawing, solid arrows indicate the flow of hot air at this time.

On the other hand, when the switching valve 20 moves to the position indicated by the alternate long and short dash line, an exhaust drying path is formed. That is, in a state where the heater 6 operates similarly, the blower 1
When the 2 is driven, the outside air is positively sucked from the intake port 5, and the wind from the outside air hits the heater 6 to generate hot air. The hot air similarly enters the drying chamber 2 to dry the laundry and contains the solvent gas. On the other hand, hot air is deprived of heat.
Thereafter, the hot air passes through the discharge path 11, the blower 12, and the communication path 13 and reaches near the upper portion of the communication path 13. In this case, the hot air is not drawn into the circulation path 15 because there is no flow of air from the circulation path 15 to the heater 6, and is directly discharged to the outside from the exhaust port 14. In the drawing, broken arrows indicate the flow of hot air at this time.

Reference numeral 21 denotes a hot air temperature sensor which is disposed downstream of the heater 6 in the introduction path 10 and detects the temperature of hot air introduced into the drying chamber 2. Reference numeral 22 denotes a drying chamber temperature sensor that is disposed in the discharge path 11 and detects the temperature of hot air whose heat has been removed by drying, that is, the temperature in the drying chamber. Reference numeral 23 denotes a cooling temperature sensor disposed downstream of the cooler 16 and in the circulation path 15 to detect the temperature of hot air after cooling. These sensors 21, 22, 23
Consists of a thermistor.

FIG. 3 shows a block circuit of the dryer.
25 is a microcomputer for controlling the dryer, 26
Is a key operation unit for setting driving information, etc., and 27 is the door 3
This is a door switch that turns off and on in accordance with opening and closing of a.
The key operation unit 26 and the door switch 27 are provided together with the steam valves 7, 8, the cooling valve 17, the blower 12, the drum motor 4, the switching valve 20, the hot air temperature sensor 21, the drying room temperature sensor 22, and the cooling temperature sensor 23, It is located around the microcomputer 25.

Next, the operation of the dryer will be described with reference to the flow of a program incorporated in the microcomputer 25 of FIG. When the drying operation is performed, the door 3a is opened, the laundry washed with the petroleum-based solvent is put into the rotary drum 3, and then the door 3a is closed, and the operation information is set by the key operation unit 26 and the operation is started. Operate keys. Based on the operation of the start key, the microcomputer 25 first determines the operation of the start key (step S1), and compares the temperatures before the start of the drying operation. That is, the temperature of the drying room detected by the drying room temperature sensor 22 is compared with the lower flash point temperature of the solvent of 40 ° C., which is a predetermined temperature (Step S2: corresponds to a comparing means of the present invention).

Now, a comparative result is obtained that it is not long after the previous drying, and that the temperature in the drying chamber is considerably higher than the lower flash point temperature due to the residual heat of the previous drying. Prior to the start of the drying operation, the microcomputer 25 executes step S3, which is the cooling air circulation means of the present invention. In the same step, in a state where the steam valves 7 and 8 are closed and the heater 6 is stopped, the drum motor 4 is driven in reverse to invert the rotary drum 3, the blower 12 is driven, and the cooling valve 17 is turned on. When opened, the cooler 16 is driven, and the switching valve 20 is further switched to the solid line position. Thereby, the cooling air cooled by the cooler 16 circulates in the drying chamber 2 and the drying chamber is rapidly cooled,
The drying room temperature detected by the drying room temperature sensor 22 falls as shown in FIG.

When the temperature of the drying room detected by the drying room temperature sensor 22 drops below 41 ° C. near the lower flash point temperature (step S4), the microcomputer 2 executes the cooling operation.
5 opens the steam valve 7 (S5 step). The remaining steam valve 8 is opened and closed according to whether or not the temperature difference obtained by subtracting the drying chamber temperature detected by the drying chamber temperature sensor 22 from the hot air temperature detected by the hot air temperature sensor 21 exceeds 8 ° C. Control, that is, the drying operation is executed (S
6 to S8 step). As a result, the temperature difference becomes approximately 8
℃, which means that the amount of heat taken by the laundry is small and the amount of solvent evaporating from the laundry per unit time is relatively small. It is kept below. Therefore, there is no danger of explosion.

Even if the temperature in the drying chamber exceeds the lower flash point temperature, if the drying operation is immediately performed without cooling the drying chamber as described above, the temperature difference of 8 ° C. can be maintained. However, since the laundry containing a large amount of solvent is suddenly continuously exposed to high temperature after washing, the amount of generated solvent gas abnormally increases, and the concentration of solvent gas in the drying chamber exceeds the lower explosive limit concentration. . That is, the temperature in the drying chamber exceeds the lower flash point temperature and the concentration of the solvent gas exceeds the lower explosive limit concentration, and there is a risk of explosion.

While maintaining the temperature difference of 8 ° C. as described above, the temperature in the drying chamber gradually increases as shown in FIG. Eventually, the drying room temperature detected by the drying room temperature sensor 22 becomes 5
When the temperature exceeds 5 ° C. (step S9), the microcomputer 25 stops the drum motor 4 to stop the rotating drum 3, stops the blower 12, closes the steam valves 7, 8, and stops the heater 6, The cooling valve 17 is closed to stop the cooler 16 (Step S10). Thus, the drying operation ends.

By the way, during the drying operation, it is determined whether or not the stop key operation on the key operation section 26 is performed.
7 is determined to be open when the door 7a is off (S11, S11).
The microcomputer 25 executes the same step S13 or S14 as the step S10, and interrupts the drying operation (steps S13 and S14 correspond to the interruption means of the present invention). In the case of interruption by the stop key, it is waited for a while after that the door 3a is opened (S15).
Steps). Then, based on the determination of opening the door, the microcomputer 25 sets the door open flag in the microcomputer 25 to 1 (step S16), and waits for the door 3a to be closed.

The opening of the door is usually performed to add laundry. When the laundry is added, the door is closed, and the start key is operated again, the microcomputer 25 determines that the door is closed by turning on the door switch 27 (step S17), and operates the start key. Is determined (S18 step), it is further determined that the door open flag is 1 (S19 step), and this flag is set to 0 (S20 step).

Then, the microcomputer 25 operates in S2
Return to step. At this time, it is determined that the temperature in the drying chamber does not readily decrease even if the drying is interrupted, and the temperature exceeds the lower flash point temperature, and the step S3 is executed again before the drying operation is restarted. As a result, the drying chamber is cooled, and the temperature of the drying chamber detected by the drying chamber temperature sensor 22 rapidly decreases as shown in FIG. When the temperature in the drying chamber falls to near the lower flash point temperature, the microcomputer 25 executes steps S6 to S8 via step S5 and restarts the drying operation.

By restarting the drying operation after cooling as described above, the drying room is not suddenly maintained at a high temperature in the presence of a large amount of solvent due to the addition of the laundry, and the solvent gas is abnormally generated. And the risk of explosion is avoided.

In the temperature comparison in step S2 before the start of the drying operation, the lower flash point temperature 40 of the solvent in which the drying room temperature detected by the drying room temperature sensor 22 is a predetermined temperature is not affected by the residual heat from the previous drying. When the microcomputer 25 obtains a comparison result of lower than the temperature, the microcomputer 25 executes the step S21, which is the heater control means of the present invention, before starting the drying operation. In this step, the drum motor 4 is driven in reverse to invert the rotary drum 3, the blower 12 is driven, the cooling valve 17 is opened and the cooler 16 is driven, and the switching valve 20 is switched to the solid line position. Further, the hot air temperature detected by the hot air temperature sensor 21 is shown in FIG.
So that the temperature of the steam valves 7 and 8 becomes approximately 50 ° C.
Open / close control.

Thus, the temperature of the drying room detected by the drying room temperature sensor 22 rapidly rises. With this rise,
When the temperature in the drying chamber reaches the predetermined temperature, ie, near the lower flash point temperature and exceeds 39 ° C., the microcomputer 2
5 executes the S6 to S8 steps after the S5 step as described above, and executes the drying operation.

When the temperature in the drying chamber is low as described above, the temperature of the drying chamber is rapidly increased before the start of the drying operation, and then the drying operation is performed. Therefore, the drying time can be reduced, and the drying efficiency can be improved.

[0032]

According to the dryer of the first aspect of the present invention, when the temperature in the drying chamber is considerably high due to the influence of the residual heat of the previous drying, etc., the heater is stopped before the drying operation is started. Since the cooling air is circulated in the drying chamber by driving the cooler and the blower to cool the drying chamber, it is possible to suppress the start of the drying operation in a state where the temperature of the drying chamber is high,
Therefore, the danger of explosion due to abnormal generation of the solvent gas can be eliminated.

Further, according to the dryer of the present invention, after the drying operation is interrupted, before the drying operation is restarted, the cooling air and the blower are driven in a state where the heating device is stopped so that the cooling air flows into the drying chamber. By circulating and cooling the drying room, it is possible to prevent the laundry from being added at the time of interruption and restarting the drying operation in a state where the temperature of the drying room is high, and the solvent gas is abnormally generated and explodes. Danger can be eliminated.

Further, according to the dryer of the third aspect, when the temperature in the drying chamber is low, the heater is driven prior to the start of the drying operation to rapidly raise the temperature in the drying chamber. The drying operation can be started when the room temperature is at an appropriate height, and the drying time can be shortened to improve the drying efficiency.

[Brief description of the drawings]

FIG. 1 is a front view of a commercial drier according to an embodiment of the present invention.

FIG. 2 is a side view of the dryer.

FIG. 3 is a block circuit diagram of the dryer.

FIG. 4 is a flowchart of an operation program of the dryer.

FIG. 5 is a diagram showing changes over time in temperature and gas concentration in the dryer.

FIG. 6 is another diagram showing a temporal change of a temperature and a gas concentration in the dryer.

FIG. 7 is still another diagram showing a temporal change of a temperature and a gas concentration in the dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dryer main body 2 Drying room 3 Rotary drum 6 Heater 12 Blower 16 Cooler 20 Switching valve 21 Hot air temperature sensor 22 Drying room temperature sensor 23 Cooling temperature sensor 25 Microcomputer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiaki Miyaji 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Masahiko Tsunoda 2-18-3 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-5-177087 (JP, A) JP-A-6-205892 (JP, A) JP-A-5-269296 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) D06F 43/08 D06F 58/28

Claims (3)

(57) [Claims] A drying chamber for storing solvent-washed laundry, a heater, a cooler, and a blower for circulating air in the order of the heater, the drying chamber, and the cooler are provided. In the dryer that generates hot air in the heater, evaporates the solvent from the laundry by the hot air, and then cools the hot air in the cooler to recover the solvent evaporated from the laundry, a drying machine that performs a drying operation. A drying chamber temperature sensor for detecting the temperature in the drying chamber; a comparison means for comparing the detection temperature of the drying chamber temperature sensor with a predetermined temperature before the start of the drying operation; and a detection temperature higher than the predetermined temperature by the comparison means. Low
When the comparison result is obtained, the heater is operated
Means for starting the drying operation, and when a comparison result indicating that the detected temperature is higher than a predetermined temperature is obtained by the comparing means, prior to the start of the drying operation, the cooler and the blower in the stopped state of the heater. A dryer provided with cooling air circulating means for driving and circulating cooling air. 2. A drying chamber for accommodating solvent-washed laundry, a heater, a cooler, and a blower for circulating air in the order of the heater, the drying chamber and the cooler are provided. In the dryer that generates hot air in the heater, evaporates the solvent from the laundry by the hot air, and then cools the hot air in the cooler to recover the solvent evaporated from the laundry, a drying machine that performs a drying operation. Hot air temperature detecting the temperature of the hot air introduced into the drying chamber
Temperature sensor and drying room temperature for detecting the temperature inside the drying room
A sensor, interrupting means for interrupting the drying operation by opening the door of the drying chamber, etc., and prior to resuming the drying operation after the interruption, driving the cooler and the blower in the stopped state of the heater to cool down. and cooling air circulating means for circulating the air, this
After executing the cooling air circulation means, the hot air temperature sensor detects
Hot air temperature and drying room temperature detected by the drying room temperature sensor
Temperature and the solvent gas concentration in the drying chamber
Operation of the heater so that it is maintained below the lower limit concentration
A dryer comprising: means for performing control . 3. A drying chamber for storing solvent-washed laundry, a heater, a cooler, and a blower for circulating air in the order of the heater, the drying chamber, and the cooler are provided. In the dryer that generates hot air in the heater, evaporates the solvent from the laundry by the hot air, and then cools the hot air in the cooler to recover the solvent evaporated from the laundry, a drying machine that performs a drying operation. A drying chamber temperature sensor for detecting the temperature in the drying chamber; a comparison means for comparing the detection temperature of the drying chamber temperature sensor with a predetermined temperature before the start of the drying operation; and a detection temperature lower than the predetermined temperature by the comparison means. When the result of comparison with the above is obtained, prior to the start of the drying operation, heater control means for driving the heater to reach the detected temperature to near a predetermined temperature, and the heater control means
After the execution of the above, the solvent concentration in the drying chamber
Means for controlling the operation of the heater so as to be maintained below
Dryer comprising the and.