JPS6342953Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a dry cleaner.

(B) Prior Art A dry cleaner has an outer tank having a drum connected to a circulation type drying air passage using a blower fan, and a condenser and a heater are arranged in this order in this drying air passage. The condenser circulates a water refrigerant cooled by a water chiller or the like, condenses the solvent in the drying air, and collects it separately. Further, the heater circulates the distillation solvent from the distiller to the water separator as a heating medium, heats the dry air and sends it to the outer tank, and liquefies the distillation solvent.

Since the heating amount by the heater is large and the temperature of normal drying air is about 50°C, the drying process can be completed in a relatively short time. On the other hand, since the distillation solvent in the heater must be cooled by drying air until the distillation is completed, a predetermined drying process time is required.

Conventionally, the temperature of the drying air at the outlet of the heater was detected, and the drying process was continued until the temperature dropped to a certain value (approximately 39°C). However, since a condenser is also provided in the drying air path, the outlet temperature changes depending on the cooling capacity of the condenser, which sometimes makes it impossible to adapt to the distillation conditions. In other words, if the cooling capacity is large, the outlet temperature tends to drop as distillation ends, but if the cooling capacity is small, the outlet temperature does not drop to a constant value even after distillation has finished, and wasteful drying continues. It became a matter of fact.

(c) Purpose of the invention The purpose of the invention is to detect the temperatures at the inlet and outlet of the heater, and to control the process based on the temperature difference to optimize the drying process.

(d) Structure of the invention The invention includes a temperature sensing element that detects the temperature of the drying air at the inlet and outlet of the heater, and a control means that compares the difference between the detected temperatures and ends the drying process when a predetermined temperature difference is reached. It is a dry cleaner equipped with Therefore, the inlet temperature changes depending on the cooling capacity of the condenser, but since it is controlled by the difference between this temperature and the outlet temperature, the end time of the drying process can be set regardless of the cooling capacity, and the drying process can be It can be executed efficiently.

(E) Example To explain based on the drawings, 1 is an outer tank with a rotating drum (not shown) inside, 2 is a solvent tank,
3 is a liquid supply pump, and at the start of washing, the solvent in the tank 2 is supplied by the liquid supply pump 3 to the outer tank 1 via a one-way valve 4 and an electrically controlled liquid supply valve 5. Reference numeral 6 denotes a circulation/drain pump provided in the solvent circulation path 7, which circulates the solvent in the outer tub 1 from the lower part to the upper part via the liquid supply valve 5 during the washing operation. Note that during the washing operation, the rotating drum is driven in reverse at a low speed.

8 is a drying ventilation path which branches from the circulation path 7 upstream of the pump 6 and whose terminal end communicates with the upper part of the outer tank 1; Blower fan 1
1, a condenser 12 and a heater 13 are provided.

Here, the liquid level switch 10 detects the solvent entering the drying air passage 8 during the washing operation, and controls the liquid level in the outer tank 1. The condenser 12 has a meandering shape, and one end is connected to the outflow side A of the water chiller via a valve 14, and the other end is connected to the cooling coil 16 in the water separator 15 and the cooling coil 17 in the tank 2. It is connected to the inlet side B of the water chiller via the water chiller. The heater 13 also has a meandering shape, with one end connected to the distiller 18 and the other end connected to the water separator 15.

The water separator 15 is connected to the tank 2, and has a float switch 19 disposed therein.

Reference numeral 20 denotes a collection part formed at a location of the condenser 12 in the drying ventilation passage 8, which collects the solvent condensed during the drying operation and flows it to the water separator 15. 2
Reference numerals 1 and 22 designate exhaust valves and intake valves that simultaneously open and close the upstream side of the condenser 12 and the downstream side of the heater 13 in the drying ventilation path 8, which are opened during drying operation to open the exhaust hole 2 to the outside.
3 and the intake hole 24 from the outside are closed (dotted line position in the figure), and closed during deodorizing operation, and the exhaust hole 23 and intake hole 24 are opened (solid line position in the figure).

Reference numeral 25 denotes an electrically controlled drain valve inserted when connecting the distiller 18 to the circulation path 7. On the other hand, it can be controlled manually, and normally it is automatically operated in the draining process after washing operation. It opens and then closes automatically in the middle of the subsequent dewatering process. Reference numeral 26 denotes a heater disposed within the heating chamber of the distiller 18, and its energization and disconnection are temporally controlled. 27 is distiller 1
This liquid level detection device is composed of an illumination lamp 28 disposed at a predetermined position of 8, and a photodetection element 29 made of CdS or the like facing the illumination lamp 28. 30 is the ventilation fan 1
This is an air passage that blows air from the distiller 1 to the distiller 18 to promote the extraction of the distillation solvent.

Reference numerals 31 and 32 indicate temperature sensing elements such as thermistors that detect the temperature of the drying air at the inlet and outlet of the heater 13 in the drying ventilation passage 8, and the detection results are read out by the central control unit 33 shown in FIG. Dedicated memory 34
The information is inputted to a control device 35 consisting of, etc.

In addition, 36... is a one-way valve, and 37 is a hopper for soap injection.

When the normal washing process is finished, the solvent is pumped 6
is introduced into the distiller 18 via the drain valve 25. During this time, inside the outer tank 1, the process progresses to the dewatering process. During this process, the heater 26 is energized and prepared. When the valve 14 is opened and the blower fan 11 is driven, distillation operation starts in the distiller 18, and drying operation starts in the outer tank 1 while rotating the drum at a low speed after the liquid removal process. The drain valve 25 and pump 6 are closed at the beginning of drying operation.
Stop.

The distilled solvent discharged from the distiller 18 exchanges heat with the drying air in the heater 13 to radiate heat, and is liquefied to the water separator 15.
Enter. A small amount of solvent in the outer tank 1 and the drying air passage 8 is circulated together with the heated drying air, and the solvent is passed through the condenser 12.
The water is condensed in the water separator 15 and collected in the collecting section 20.
Enter.

The liquid level detection device 27 is activated when the solvent in the distiller 18 reaches an abnormal level due to incorrect operation, bumping, etc., and the heater 2
6 is turned off and an abnormality is reported.

an outlet of the condenser 12, that is, an inlet of the heater 13;
Each temperature at the outlet is detected by temperature sensing elements 31 and 32. This detection signal is input to the control device 35 and compared. Then, when the temperature difference between the inlet and the outlet drops to a predetermined value (for example, about 10° C.), the control device 35 ends the distillation process and the drying process and shifts to the deodorizing process.

In the deodorizing process, the intake and exhaust valves 21 and 22 open the intake and exhaust holes 23 and 24, and the blower fan 11 introduces outside air to expel the odor.

In the drying and distillation process, when the cooling capacity of the condenser 12 is large, the inlet temperature is low, but during distillation, the temperature is kept constant by the heater 13. Once the distillation is finished, the outlet temperature quickly decreases to a temperature difference of 10°C or less. On the other hand, even when the cooling capacity is small, constant heating is performed in the heater 13, so the outlet temperature decreases at the end of distillation. In any case, by using the temperature difference as a criterion, it is possible to measure the end of distillation regardless of the temperature of the drying air and the cooling capacity of the condenser 12, and to synchronize the end of the drying operation. I can do it.

The relationship between the control device 35 and the temperature sensing elements 31 and 32, which are comprised of, for example, thermistors, is shown in the control circuit diagram of FIG. The inlet and outlet temperatures from the temperature sensing elements 31 and 32 are converted into voltages and input into the comparison inputs of comparators 38 and 39, respectively, and the ladder output voltages from the expander 40 and the ladder circuit 41 are input as comparison reference inputs. The comparators 38 and 39 compare the temperature data based on the ladder output voltage with the inlet and outlet temperatures based on the thermistor voltage, and output the data to the central controller 33 when they match. Note that 42 represents an address bus, and 43 represents a data bus.

The drying process using this control circuit will be explained using the flowchart in Figure 3 A and B. First, the measured values and temperature data of the inlet and outlet temperatures are cleared,
Display the drying process on the display program,
The temperature at the inlet and outlet detected by the temperature sensing elements 31 and 32 is measured by the control device 35 according to the program shown in FIG. 3B, and a timing program is also executed.
As a result, a closing signal is input to the intake and exhaust valves 21 and 22, a drive signal is input to the blower fan 11, an open signal is input to the valve 14, and a low-speed reversal drive signal is input to the drum rotation motor. In addition, drain valve 2
5. Description of the control of the pump 6 and the heater 26 is omitted.

The temperature at the inlet and outlet is measured every second, and if the temperature difference is 10 degrees or more, the operation is repeated from the beginning, and if it is less than 10 degrees, the process moves to the deodorizing process.

The inlet and outlet temperature measurement program shown in Figure 3B compares the output voltage of the ladder circuit to which temperature data is added in steps with the voltage of each element at the inlet and outlet, and if they do not match, the inlet and outlet temperatures are Add the measured value and the outlet temperature measured value by +1, and
Step the temperature data by +1. In this way, steps are taken until a match is found, during which time the inlet and outlet temperature measurements are added.

Then, it is compared and determined whether the temperature measurements at the inlet and outlet, which have been added up until they match, are less than 10 degrees.

FIG. 4 shows another flowchart configured for comparing the measurement program and temperature measurement values, omitting the load control system and the like. Here, +1 is added to the inlet and outlet temperature registers each time there is a mismatch in the voltage comparison, and the inlet and outlet temperature registers are compared each time there is a match, regardless of time.
We are measuring whether there is a 10° temperature difference.

(f) Effects of the invention This invention can determine the end of distillation and drying regardless of the cooling capacity of the condenser or the ambient temperature, eliminates wasted process time, and provides an efficient dry cleaner.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram of a dry cleaner according to the present invention, FIG. 2 is a control circuit diagram, FIGS. 3A and 3B are flowcharts, and FIG. 4 is a flowchart of another embodiment. 1... Outer tank, 2... Tank, 8... Drying air path,
11...Blower fan, 12...Condenser, 13...
Heater, 15... Water separator, 31, 32... Temperature sensing element, 35... Control device, 38, 39... Comparator.

Claims (1)

[Scope of utility model registration request] In a dry cleaner, a circulation type drying air passage using a blower fan is connected to an outer tank having a drum, and a solvent condenser disposed in the drying air passage and a drying air flow downstream of this condenser are installed. Comparison of the difference in detected temperature between a heater placed in the ventilation path that circulates the distilled solvent toward the water separator, and a temperature sensing element that detects the temperature of the drying air at the inlet and outlet of this heater. and a control means for terminating the drying process at a predetermined temperature difference.