JPH08168594A - Dry cleaner - Google Patents

Abstract

PURPOSE: To secure safe operations by preventing solvent to be supplied into a drum from reaching a flash point by operating an air blowing means when the inner temperature of the drum is higher than a first set value and starting a washing process when the inner temperature of the drum gets lowered to a second set value lower than the first set value. CONSTITUTION: The dry cleaner houses a cylindrical drum 1, for which a lot of holes are formed on surrounding walls, inside an outer vessel 2 so as to rotate it, and a circulating path 3 for air and atomized solvent and a liquid drainage duct 4 for solvent are provided on the outer vessel 2. Then, a blower 5, exhaust port 6, cooler 7, air sucking valve 8 and heater 9 are successively arranged at the circulating path 3. In this case, the temperature inside the drum 1 is detected by a temperature sensor SE4 and when that detected temperature is higher than the first set value, the drum 1 is cooled by operating the blower 5. When the temperature inside the drum 1 gets lowered to the second set value lower than the first set value, the washing process is started and washing is performed by supplying solvent to the drum 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry cleaner which uses a petroleum solvent in a single rotating drum to perform various steps such as washing clothes, draining solvent from clothes and drying clothes. .

[0002]

2. Description of the Related Art Conventionally, in this type of dry cleaner, a petroleum solvent is supplied as a cleaning agent into the drum to wash clothes, and after the liquid is removed, the solvent is flammable. Therefore, it is known that the temperature of the solvent is controlled below the flash point in order to prevent the solvent from catching fire or exploding (see, for example, JP-A-62-176498).

[0003]

However, when the dry cleaner is continuously operated a plurality of times, the temperature in the drum rises in the drying process in the previous operation, so that in the cleaning process in the next operation, The solvent supplied to the drum is above the flash point in the drum and there is a risk of ignition. The present invention has been made in consideration of such circumstances, and when the drum temperature is high, the solvent supplied to the drum is maintained below the flash point by cooling the drum in advance at the start of operation. It provides a dry cleaner capable of

[0004]

SUMMARY OF THE INVENTION According to the present invention, a drum for containing clothes, a solvent supplying means for supplying a solvent from a solvent tank to the drum, a dry air flow for supplying the dry air flow to the drum, and a dry air flow discharged for the drum again. For controlling the solvent supply, ventilation, heating and cooling means, and the cooling means for cooling the drying air discharged from the drum. In a dry cleaner having an operating means for operating a series of cleaning and drying steps, when the drum temperature detecting means for detecting the temperature inside the drum and the detected temperature of the drum temperature detecting means are higher than the first set value. A drier for operating the blowing means to cool the drum and causing the operating means to start the cleaning process when the temperature detected by the drum temperature detecting means decreases to a second set value lower than the first set value. There is provided a dry cleaner which is characterized by comprising temperature control means.

In the present invention, the drum for containing clothes is a drum which is rotatably supported in the washing tank so that its shaft is substantially horizontal and has a large number of small holes through which the dry air and the washing liquid are passed. The drive means (for example, a motor) is configured to be rotatable in the forward and reverse directions within a speed range of about 0 to 700 rpm. The solvent supply means preferably includes a solvent tank, a supply path connecting the drum, and a pump.

The heating means for heating the dry air supplied to the drum is preferably a heater for supplying a heat medium (heat medium (steam) from a steam boiler to heat the dry air to about 50 to 100 ° C.). However, it may be an electric heater or a gas heater.

The cooling means for cooling the dry air discharged from the drum is composed of a cooler for cooling the dry air by receiving a refrigerant (for example, cold water) from a refrigerant supply source (chiller), but it is particularly limited to this. It is not something that will be done.

The operation means for controlling a solvent supply, air blowing, heating and cooling means to drive a series of washing and drying steps is an electric means for continuously executing each step according to a preset program (sequence). It is a control device, and a microcomputer including a CPU, a ROM, a RAM and an I / O port can be used for this.

The drum temperature detecting means for detecting the temperature in the drum is provided in the drum or in the vicinity of the outlet of the dry air from the drum, and is composed of, for example, a thermistor or a thermocouple.

The drum temperature control means operates the blowing means to cool the drum when the temperature inside the drum is higher than the first set value, and the temperature detected by the drum temperature detection means is lower than the first set value. The operating means is caused to start the washing process when the set value is reduced, and an electric control means, for example, a microcomputer can be used for this.

The first set value is a drum temperature at which there is a risk that the solvent will be heated above the flash point by the drum when the solvent is supplied to the drum, for example, 50 ° C. The second set value is the drum temperature without danger as described above, and is, for example, 40 ° C.

The dry cleaner is a solvent heater and a solvent cooler for heating and cooling the solvent contained in the solvent tank, a solvent temperature detecting means for detecting the solvent temperature, and a solvent based on the temperature detected by the solvent temperature detecting means. And a solvent temperature control means for operating the heater or the solvent cooler to control the solvent temperature. The solvent temperature may be controlled so that the solvent temperature is controlled by the solvent heater when the temperature inside the drum is lower than the third set value.

In this case, the solvent temperature control means is arranged so that the temperature inside the drum is set to a third set value (eg, 30) which is lower than the second set value.
℃) or more, it is judged that the solvent temperature is higher than the appropriate temperature (for example, 25 ° C) by the previous operation, and the solvent cooler is used to control the cooling of the solvent so that the temperature inside the drum is higher than the third set value. When the temperature is low, it is determined that the solvent temperature is lower than the proper temperature, and the solvent heater is controlled to heat the solvent. In other words, the solvent temperature control means (cooler or heater) is selected in advance in accordance with the drum internal temperature, thereby facilitating the control of the solvent temperature.

In particular, when the solvent temperature control means is a means in which a heater and a cooler for selectively passing the heat medium and the refrigerant through one passage provided in the solvent passage are integrated, that passage is provided. It is possible to avoid a rapid change between the heat medium and the refrigerant supplied to the device, and to reduce the heat shake applied to the device.

[0015]

The drum temperature detecting means detects the temperature inside the drum, and the drum temperature control means operates the air blowing means to cool the drum by detecting when the detected inside temperature of the drum is higher than the first set value. When the drum internal temperature is lowered to the second set value lower than the first set value, the operating means starts the cleaning process. Therefore, if the first and second set values are determined in consideration of the flash point and cleaning characteristics of the solvent supplied to the drum, the cleaning process can be safely and efficiently executed.

Further, when the solvent temperature is controlled by the solvent heater and the solvent cooler, the solvent temperature is higher than the proper value when the temperature inside the drum is equal to or higher than the third set value which is lower than the second set value. When the temperature inside the drum is lower than the third set value, the solvent temperature is also determined to be lower than the appropriate value, and the solvent heater controls the temperature.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the drawings. This does not limit the present invention. FIG. 1 is an external perspective view of a dry cleaner using a petroleum-based solvent.
01 is a door for opening and closing the clothes inlet, 102 is a door handle, 103 is a door frame, 104 is a door glass, 1
Reference numeral 05 is a front panel, PS is a power switch, 34 is a keyboard, and 35 is a display panel.

FIG. 2 is an explanatory view of the structure of the dry cleaner shown in FIG. 1, in which 1 is a drum for containing clothes and 2 is an outer tank. The drum 1 is formed in a cylindrical shape with a large number of holes opened in its peripheral wall, and is rotatably supported in the outer tub 2. In the outer tub 2, a circulation path 3 for air and a vaporized solvent and a drainage path 4 for a solvent liquid are provided outside a cylindrical portion that covers the outer periphery of the drum 1.

Along the path of the circulation path 3, the drum outlet temperature sensor SE ₄ , the blower 5, the exhaust port 6, the cooler 7, the cooler outlet temperature sensor SE ₅ , the intake valve 8, the heater 9 and the inside of the circulation path 3 are provided. The drum inlet temperature sensor SE ₆ is arranged in this order. The temperature sensors SE _{4 to} SE ₆
Is a thermistor.

Further, at the bottom of the outer tank 2, a liquid level sensor SE ₁ for detecting the solvent level in the drum 1 through a liquid drainage line 4 and the discharge of the solvent in the drum 1 are detected. A button trap 10 with a liquid level sensor SE ₇ is connected. The button trap 10 is the drum 1.
It is a kind of filter for removing solid matters such as clothes buttons contained in the solvent discharged from the filter.

The cooler 7 introduces the cooling water supplied from the cooling water source W, and then returns the cooling water to the cooling water source W to cool the air flowing in the circulation path 3 and the vaporized solvent to remove the solvent. It is designed to be condensed and liquefied. After the water is removed from the liquefied solvent via the water separator 13,
It is returned to the solvent tank 11.

The intake valve 8 is constructed so as to be opened and closed by an air cylinder 8a, and is normally closed as shown in FIG. 2. Therefore, by driving the blower 5, dry air is circulated. 2 circulates in the direction shown by the arrow in FIG. 2, but when the intake valve 8 is opened to drive the blower 5, external air is taken into the drum 1 and discharged from the exhaust port 6.

By opening the valves 24 and 27, the heater 9 introduces steam of about 100 to 120 ° C. from the steam source S to heat the air flowing through the circulation path 3. The cooling water source (chiller) W and the steam source (boiler) S are usually installed outside the dry cleaner.

The liquid supply port of the solvent tank 11 and the liquid discharge port of the button trap 10 are connected to the suction port side of the pump P via a liquid supply valve 21 and a liquid discharge valve 22, respectively. Also,
The discharge port side of the pump P is connected to the heat exchanger 12 via the filter F.

The heat exchanger 12 is constructed by providing a pipeline 12a through which steam or cooling water selectively flows in the solvent flow passage, and the solvent outlet of the heat exchanger 12 is a three-way switching valve 23. Is selectively connected to the solvent tank 11 or the drum 1.

In the heat exchanger 12, the valves 24, 25,
By opening 28 and closing valves 26, 29, steam flows through the pipe 12a, and valves 25, 28
By closing the valve and opening the valves 26 and 29, the cooling water flows through the inside of the conduit 12a, and heating and cooling with respect to the solvent can be selectively performed.

SE ₂ is a temperature sensor provided at the solvent inlet of the heat exchanger 12 and composed of a thermistor, and detects the solvent temperature. SE ₃ is an overheat temperature sensor that is provided in the heat exchanger 12 and is composed of a thermostat for detecting the overheat of the solvent.

SW is a pressure switch provided on the discharge port side of the pump P for detecting the solvent flow rate. When the solvent is supplied to the drum 1, the solvent outlet of the heat exchanger 12 is connected to the three-way switching valve 2
3 connects to the drum 1 and opens the valve 21 to drive the pump P.

When the solvent is discharged from the drum 1, the solvent outlet of the heat exchanger 12 is connected to the solvent tank 11 by the three-way switching valve 23, the valve 22 is opened and the valve 21 is closed to drive the pump P. . As a result, the solvent discharged from the drum 1 is stored in the solvent tank 11 after being purified by the button trap 10 and the filter F.

When the solvent is not supplied to the drum 1, the solvent outlet of the heat exchanger 12 is connected to the solvent tank 11 by the three-way switching valve 23, the valve 22 is closed and the valve 21 is opened to drive the pump P. Then, the solvent circulates among the solvent tank 11, the filter F, and the heat exchanger 12, so that the solvent can be purified and the temperature can be controlled.

FIG. 3 shows a drum 1, an outer tank 2 and a circulation path 3.
FIG. 4 is a cross-sectional view of a main part showing an arrangement relationship of the rotating shaft 107 of the drum 1 that is rotatably supported by a bearing 108 provided in the outer tub 2, and is controlled by an inverter via pulleys 109, 110 and a pulley belt 111. (Variable speed)
It is coupled to the motor M.

When the door 101 is closed, one end (outlet) of the circulation path 3 is connected to the clothes inlet of the drum 1, and the other end (inlet) is connected to the peripheral wall of the outer tub 2. Therefore, when the motor M is driven and the drum 1 rotates, the drum 1 acts like a centrifugal fan (for example, a sirocco fan), and even if the blower 5 is stopped, the dry air is indicated by the arrow in FIG. Circulate. In addition, 106 is the door 10
1 is a rubber packing for sealing 1.

FIG. 4 is a block diagram of a control system. Reference numeral 31 denotes a control unit, that is, a microcomputer, and the microcomputer 31 is composed of a CPU, a ROM and a RAM.

The microcomputer 31 has a keyboard 34 and a display panel 3 via input / output ports 32 and 33.
5, drum driving motor M, pump P, blower 5, intake valve 8, valves 21 to 29, liquid level sensors SE ₁ , SE ₇ , temperature sensor SE ₂ , overheat temperature sensor SE ₃ , temperature sensor SE
_{4 to} SE ₆ and the pressure switch SW are connected to drive and control them and also take in detected values from them.

FIG. 5 is a detailed diagram of the keyboard 34. When the keyboard 34 is operated by operating the program key 41 and then the program number is designated by the ten keys 44, among the plurality of operation programs stored in the microcomputer 31. Is called, and the setting data of each process in the program is displayed on the display panel 35.

In this state, by operating the call key 43 to sequentially specify each stroke of the operation program, a new operation can be performed in each of the specified strokes and a new operation program can be registered. Reference numeral 42 is a start / stop key for starting / stopping the operation of the dry cleaner.

On the display panel 35, the temperature of the solvent in the cleaning process, the temperature of the cooler 7 in the drying process, the cool down time,
The LED corresponding to each timing such as the drum reversing cycle, the method of circulating the solvent, the method of draining the liquid, the method of supplying the liquid with high, medium, and low drum rotation speeds, and other stroke setting contents at the time of automatic or manual operation. It is designed to be displayed by lighting or the like.

Next, the entire process of the dry cleaner having such a structure will be schematically described. As shown in FIG. 6, first, in the preparatory operation step (step S100), when the power switch 4 is turned on, the steam source S is supplied to the heater 9.
The steam is supplied from the cooling water source W to the cooler 7.
Cooling water is supplied from the heater to drive the blower 5, and the operating states of the heater 9 and the cooler 7 are controlled by the temperature sensors SE ₆ and S.
Judgment is made based on the detected temperature of E ₅ . And the heater 9
The display panel 3 indicates whether the cooler 7 is normally operating (operable) or not (inoperable).
Display in 5.

If it can be operated, in the cleaning step (step S200), at the same time as supplying the solvent to the drum 1, the drum 1 is intermittently operated at a low speed (30 to 50 rpm).
Rotate in reverse (reverse) and wash by tapping for a predetermined cleaning time. In this cleaning process, the temperature inside the drum is adjusted to an appropriate value before the cleaning liquid (solvent) is supplied to the drum 1.

When the washing process is completed, the solvent is discharged from the drum 1 in the deliquoring process (step S300).
After that, the drum 1 is normally rotated at a high speed (600 to 700 rpm) to deliquify liquid, and when a predetermined deliquoring time elapses, the drum 1 is stopped to complete the deliquoring process. In this dewatering step, the heater 9 is operated during high speed rotation of the drum 1,
Warm air is supplied to the drum 1 by utilizing the low-speed circulating air generated by the high-speed rotation of the drum 1 to preheat the drum 1.

After completion of the deliquoring process, a drying process (S400)
In the above, the drum 1 is intermittently rotated at a low speed in the forward and reverse directions, and the blower 5, the cooler 7, and the heater 9 are driven,
Dry air is supplied to the drum 1. After the lapse of a predetermined time, the operation of the heater 9 is stopped, the cool air is supplied to the drum 1 (cool down), and then the next deodorizing process (S500) is performed. During the drying process, the solvent is locally overheated to check the operation of the overheat temperature sensor (thermostat) SE ₃ .

In the deodorizing process, the intake valve 8 is opened to supply the external air to the reversing drum 1, and after a predetermined time, the intake valve 8 is closed to stop the rotation of the drum 1 to end the deodorizing process. This completes the entire dry cleaner operation.

Next, a detailed operation in a main stroke of the above strokes will be described with reference to a flowchart. (1) Preparatory Operation Step FIG. 7 is a flowchart showing the preparatory operation step. Figure 7
In step 1, when the power switch PS of the main body 100 is turned on, the blower 5 is operated, the intake valve 8 is closed, the valves 24 and 27 are opened, and steam is allowed to flow from the steam source S to the heater 9 to perform the preparatory operation. Is started (step S10
1 to S104). As for the cooler 7, if the cooling water source W is operating normally, the cooling water always circulates through the cooling water pipe, and the cooling water is supplied to the cooler 7.

At the same time when the preparatory operation is started,
Step S105), temperature sensor SE ₆And temperature sensor
SE_FiveStarts temperature measurement. Temperature sensor SE₆Is 70 ° C
When the above is continuously detected for 10 seconds (step S10)
6), it can be determined that the steam source S is operating normally
Therefore, as the heater preparation is OK, the valves 24 and 27 are closed.
Finish checking the operating state of the steam source S (step
S107-S109). In addition, the temperature sensor SE_FiveIs 1
Cooling water source W is normal when 2 ℃ or less is detected continuously for 2 minutes.
Since it can be judged that it is working, the cooler preparation is OK.
(Steps S110 and 111).

Then, when both of the above two conditions are cleared, the blower 5 is stopped, the preparatory operation is completed, and the operation standby state is entered, and the contents thereof are displayed on the display panel 35.
Is displayed (steps S112 to S114). However, if either of the above two conditions cannot be satisfied, the preparatory operation is performed until 25 minutes have elapsed after the power was turned on. If the conditions cannot be cleared even after 25 minutes have passed, it is determined that the steam source S or the cooling water source W is not operating normally, the preparatory operation is terminated, and the display panel 35 indicates that the operation is impossible. It is displayed to prompt the user to check the operating state of the steam source or the cooling water source W (steps S114 to S118).

As described above, in the dry cleaner, the normal operation is started after confirming the normal operation of the steam source S and the cold water source W in the preparatory operation, so that the steam source S or the cold water source W is started. It is possible to prevent operation interruption accidents and solvent ignition / explosion accidents due to malfunction of the.

(2) Cleaning Step FIG. 8 is a flowchart showing the cleaning step. In FIG. 8, when the start / stop key 42 (FIG. 5) is pressed, the temperature sensor SE for detecting the temperature inside the drum 1 is detected.
₄ starts temperature measurement (step S201). When the temperature sensor SE ₄ detects 50 ° C. or higher (step S202), the blower 5 is operated to cool the drum 1 and the outer tub 2 (step S203), and the temperature detected by the temperature sensor SE ₄ becomes less than 40 ° C. Then, the blower 5 is stopped (steps S204 and S205).

Next, when the solvent is supplied from the tank 11 to the drum 1 at the same time as the drum 1 is intermittently rotated at a low speed in the normal and reverse directions (reversed), and the solvent in the drum 1 reaches a predetermined liquid level,
The liquid supply from the tank 11 to the drum 1 is stopped (steps S206 to S209). Next, the solvent (cleaning agent) of the drum 1 is circulated to the button trap 10, the pump P, the filter F, the heat exchanger 12, and the drum 1 (step S2
10) If the solvent temperature is 27 ° C or higher, the cooler 7 is operated, and if it is lower than 27 ° C, the operation of the cooler 7 is stopped (steps S210 to S213) to keep the temperature of the cleaning liquid at 27 ° C or lower. Temperature control is performed.

Next, the drum 1 in step S206
When 7 minutes have passed since the start of the reversal of (step S
214), the solvent circulation operation is stopped, the reversal operation of the drum 1 is stopped, and the cleaning process is completed (step S2).
15, S216). In step S202,
Temperature detected by temperature sensor SE ₄ (drum outlet temperature) is 50
If the temperature is lower than 30 ° C and higher than 30 ° C (step S217),
The routine proceeds to step S206.

Further, in steps S202 and S217, if the temperature detected by the temperature sensor SE ₄ is less than 30 ° C., the drum 1 starts the reversing operation, the solvent is supplied from the tank 11 to the drum 1, and the inside of the drum 1 is discharged. When the solvent reaches a predetermined liquid level, the liquid supply from the tank 11 to the drum 1 is stopped (steps S218 to S220).

Next, the cleaning agent on the drum 1 is circulated to the button trap 10, the pump P, the filter F, the heat exchanger 12 and the drum 1 (step S221), and the temperature of the cleaning agent is less than 23.degree. If you activate the heater 9,
When the temperature becomes 23 ° C. or higher, the heater 9 is stopped from operating (steps S222 to S224) to perform temperature control for keeping the temperature of the cleaning liquid at 23 ° C. or lower. Then, when 7 minutes have elapsed from the start of the reversal of the drum 1 in step S218, the cleaning process is ended (step S2).
15, S216).

According to the cleaning process of this embodiment, since the temperature inside the drum is set in advance to the proper temperature range at the start of the cleaning process, the danger of solvent ignition and explosion is avoided and efficient cleaning is performed. It can be performed.

Further, since the solvent temperature can be estimated from the value of the temperature in the drum before the start of the cleaning process, the heating or cooling means necessary for controlling the solvent temperature in accordance with the temperature in the drum, that is, It is possible to select a solvent heater or a solvent cooler in advance, which facilitates temperature control control of the solvent during the cleaning process.

(3) Drying Process FIGS. 9 and 10 are flowcharts showing the drying process. When the liquid removal process is completed, as shown in FIG. 9, the pump P is operated (step S401), the solvent is circulated to the solvent tank 11, the filter F, the heat exchanger 12, and the solvent tank 11, and the solvent is removed. The temperature control for maintaining the temperature of about 25 ° C. is started (step S402).

At the same time, the blower 5 and the heater 9 are operated to supply warm air to the drum 1 (step S403,
S404) If the drum inlet temperature, that is, the temperature detected by the temperature sensor SE ₆ does not rise to 50 ° C. or higher within 3 minutes, it is determined that the steam source S is malfunctioning, and the operation is stopped (steps S405 to S407). ). When the drum inlet temperature rises to 50 ° C. or higher within 3 minutes, the operation of the steam source S is determined to be normal, and low temperature drying is performed for a predetermined low temperature drying time (steps S408 and S409).

Here, low temperature drying means that the temperature inside the drum 1 is kept at a safe temperature (while keeping the drum inverted, until the concentration of the solvent vaporized in the drum 1 falls below a safe value (0.6 vol%). This is drying performed by supplying warm air to the drum 1 while maintaining the drum inlet temperature at 50 ° C. in order to keep the temperature below 40 ° C.).

Next, high temperature drying is performed (S410). The high temperature drying means that when the concentration of the solvent vaporized in the drum 1 falls below a safe value, the drum 1 is turned over and hot air at a higher temperature (about 70 to 100 ° C.) is kept for a predetermined high temperature drying time. It is to supply it to the drum 1 and efficiently dry it.

Here, the overheat temperature sensor (thermostat) SE ₃ is in the reset (non-operating) state, and the number of times of operation up to now (counted by the counter function of the microcomputer 31) is 50 or more. For example, as described later, the operation check of the overheat temperature sensor (thermostat) SE ₃ is performed according to the flowchart shown in FIG. 10 (steps S410a, S411, S412).
Then, when a predetermined high temperature drying time has elapsed, the high temperature drying is terminated (steps S413 and S414), the operation of the heater 9 is stopped, and the cool air from the cooler 7 is supplied to the drum 1 for a predetermined cooldown time. The inside of 1 is cooled and a drying process is complete | finished (step S415).

Incidentally, steps S410a and S411.
In the case where the superheat temperature sensor SE ₃ is in the operating state or the number of times of operation is less than 50 times, the routine proceeds to step S413, and the drying process is ended without checking the operation of the superheat temperature sensor SE _3. Yes (it is entrusted to the next driving).

Next, according to FIG. 10, the overheat temperature sensor SE
The operation check of ₃ is explained. In the operation check, first, the count number of the number of operations counted in step S411 of FIG. 9 is reset, the pump P is stopped, and the temperature control of the solvent (solvent circulation operation) is stopped (step S).
416-S419).

Then, the valves 24, 25 and 28 are opened and steam is supplied to the heat exchanger 12 for 10 seconds only.
The solvent in 2 is overheated (step S420), and it is determined whether or not the overheat temperature sensor SE ₃ (thermostat) operates (step S421). If it does not operate even after 1 minute has passed (step S422), steam is further supplied to the heat exchanger 12 for 5 seconds, and the superheat temperature sensor SE
The operation of ₃ is discriminated (steps S423 and S424).

When the test is not started even after 2 minutes have passed (step S425), steam is further supplied to the heat exchanger 12 for 5 seconds to judge the operation of the overheat temperature sensor SE ₃ (step S426, S427). If the test does not work within 3 minutes after starting the test (step S
428), it is determined that the overheat temperature sensor SE _{3 is} abnormal,
The fact is displayed on the display panel 35. On the other hand, step S
When the sensor SE ₃ normally operates in 421, S424 or S427, it is determined that the overheat temperature sensor is normal (step S431), and the operation test ends (step S430). Then, the pump P is continuously operated to circulate the solvent, and the temperature of the solvent is controlled by the heat exchanger 12 (steps S431 and S432).

The operation check of the overheat temperature sensor (thermostat) SE ₃ of this embodiment is performed in step S40 of FIG.
As shown in 3 to S405, since it is performed after it is confirmed in advance that the steam source S is normal during low temperature drying, the valves 24, 25, 2 for supplying to the steam heat exchanger 12 are shown.
8 is operated for a predetermined time, that is, the solvent in the heat exchanger 12 is overheated. Therefore, the operation check of the overheat temperature sensor SE ₃ can be performed without error.

This operation check is performed in step S4.
As shown in FIG. 11, the predetermined number of dry cleaner operations (5
It is performed every 0 times), and it is not necessary to overheat the solvent for each operation, so that the temperature control of the solvent becomes easy.

Further, this operation check is performed after the pump P is stopped, as shown in step S418, so that only the solvent contained in the heat exchanger 12 is heated, and the other pipes and the solvent tank 11 are not heated. The solvent is not heated. Therefore, after the operation check, the temperature of the entire solvent can be quickly returned to the original temperature.

[0066]

According to the present invention, the temperature of the drum is suppressed within an appropriate range, and the solvent supplied into the drum does not rise to the flash point, so that the dry cleaner can be operated safely. Further, when the means for controlling the solvent temperature by selectively using the heater and the cooler is used, one of the heater and the cooler is selected in advance corresponding to the drum temperature, so that the control of the solvent temperature is simplified.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating the configuration of an embodiment.

FIG. 3 is a cross-sectional view of a main part of the embodiment.

FIG. 4 is a block diagram of a control system of the embodiment.

FIG. 5 is a front view showing the keyboard of the embodiment.

FIG. 6 is a schematic flowchart showing a process of the embodiment.

FIG. 7 is a flowchart of a preparatory operation process according to the embodiment.

FIG. 8 is a flowchart of a cleaning process according to an embodiment.

FIG. 9 is a flowchart of the drying process of the example.

FIG. 10 is a flowchart showing a main part of a drying process of the example.

[Explanation of symbols]

1 Drum 2 Outer tank 3 Circulation path 4 Drainage line 5 Blower 6 Exhaust port 7 Cooler 8 Intake valve 9 Heater 11 Solvent tank 12 Heat exchanger 13 Water separator 21-29 valve SE ₁ Liquid level sensor SE ₂ Temperature sensor SE ₃ Overheat temperature sensor SE ₄ Temperature sensor SE ₅ Temperature sensor SE ₆ Temperature sensor SE ₇ Liquid level sensor SW Pressure switch S Steam source W Cooling water source F Filter

Claims (2)

[Claims] 1. A drum for containing clothes, a solvent supply unit for supplying a solvent from a solvent tank to the drum, and a circulation type air supply unit for supplying dry air to the drum and supplying the discharged dry air to the drum again. A heating means for heating the dry air supplied to the drum, a cooling means for cooling the dry air discharged from the drum, and a series of cleaning and drying processes by controlling the solvent supply, air blowing, heating and cooling means. In a dry cleaner equipped with a driving means for driving the drum, the drum temperature detecting means for detecting the temperature inside the drum, and when the detected temperature of the drum temperature detecting means is higher than the first set value, the blowing means is operated to drive the drum. And a drum temperature control means for causing the operating means to start the cleaning process when the temperature detected by the drum temperature detection means decreases to a second set value lower than the first set value. A characteristic dry cleaner. 2. A solvent heater and a solvent cooler for heating / cooling a solvent contained in a solvent tank, a solvent temperature detecting means for detecting a solvent temperature, and a solvent heater or a solvent cooler based on the temperature detected by the solvent temperature detecting means. And a solvent temperature control means for controlling the solvent temperature to control the solvent temperature. The solvent temperature control means controls the solvent temperature by the solvent cooler when the drum internal temperature is equal to or higher than a third set value lower than the second set value. The dry cleaner according to claim 1, wherein the solvent temperature is controlled by a solvent heater when the temperature inside the drum is lower than a third set value.