JPH0214794Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a dry cleaner using a solvent that can be recycled by distillation.

(B) Prior Art This type of dry cleaner is regenerated by distillation after use because solvents such as trichloroethane are expensive, and is equipped with a cooler that cools and condenses the solvent after heating and distillation. Such a cooler has a cooling coil arranged therein, and cooling water (medium) is constantly supplied to this coil from a chiller or the like. This cooling water supply is, for example,
According to Japanese Patent No. 55198, detection is performed by disposing a flow switch on the inlet side of the cooling coil.

However, in this conventional method, a resistance is installed in the coil, which tends to cause malfunctions and abnormal noises due to piping problems and dirt clogging, and to ensure this, a flow switch is extremely expensive. Furthermore, it is not possible to detect the supply amount corresponding to the cooling water temperature.

(c) Problems to be solved by the invention The present invention reliably and inexpensively detects a shortage of cooling water supply, and also detects the end of distillation regeneration work.

(d) Means for solving the problem The solution according to the present invention consists of a pressure switch that detects the supply pressure of cooling water (medium) inside the cooling coil, a sensor that measures the temperature inside the cooler, and the above pressure switch. a pressure determination unit that determines the operation of the
Consisting of a temperature discrimination section that discriminates whether the temperature measured by the sensor is within a predetermined temperature range, and a heating control section that controls the heating means based on the discrimination signals from the pressure discrimination section and temperature discrimination section. be done.

(E) Function When the cooling water is constantly supplied, the inexpensive pressure switch outputs a pressure signal from the supplier, and when a shortage occurs, the pressure discrimination section outputs a shortage discrimination signal, and in response to this, heating control is performed. section deactivates the heating means. In addition, even if the pressure switch is outputting a pressure signal indicating that supply is available, if the temperature inside the cooler exceeds the upper limit, the temperature determination unit will determine that the actual cooling capacity is insufficient, and the heating control unit will Deactivate the heating means. Furthermore, when sufficient cooling water is supplied and heating distillation work progresses, and the measured temperature drops from within the appropriate temperature range to beyond the lower limit, the temperature determination section determines that there is no more distillation solvent to be cooled, that is, the work is complete. Then, the heating means is deactivated by the heating control section.

(f) Example To explain the piping configuration of the cleaning machine based on Fig. 4, 1 is a first tank containing a cleaning solvent, and 2 is a rinsing (second bath) solvent (or new solvent). The second tank accommodates the pump 5 and is connected to the suction side of the pump 5 via main valves 3 and 4, respectively. The discharge side of the pump 5 is connected via a manual valve 6 and a check valve 7 to a filter valve 8, a distillation valve 9 and a bypass valve 10. The filter valve 8 is connected to the sight glass 12 via the filter 11, the distillation valve 9 is connected to the distiller 13, and the bypass valve 10 is connected to the sight glass 12. The sight glass 12 is connected to a washing tub 15 via a liquid supply valve 14 and to the first tank 1 via a circulation valve 16.

The washing tub 15 is equipped with a rotating drum (not shown) that rotates at a low speed during washing and drying and at a high speed when removing liquid, and is connected to a solvent recovery circuit 17 to serve as a drying chamber. This washing tub 15 has a drain valve 18 and a button trap 1 at the bottom.
It is connected to the first tank 1 via a water pipe 9, and a predetermined high portion thereof is connected to the first tank 1 via an overflow channel 20 and a button trap 19.

The vaporized solvent distilled by the distiller 13 is cooled by a cooler 21, condensed and liquefied, and water is separated by a water separator 22 before returning to the second tank 2.

Here, as shown in FIG. 1, the distiller 13 has an evaporation chamber 23 that accommodates the used solvent and a lower heating chamber 24. A steam supply source is connected through a steam supply valve 25 and a small diameter steam supply valve 26 for preheating. A sensor 27 is provided to measure the temperature inside the heating chamber, and the preheating operation is controlled based on this measured temperature.

In addition, a cooling coil 28 is provided in the cooler 21 to move the cooling water from top to bottom to top.
A supply source (for example, a chiller device) is connected, and a pressure switch 29 is connected to the inlet side of the cooler 21 via an air trap. This pressure switch 29 has a diaphragm type,
Semiconductor pressure sensors, pressure-sensitive conductive rubber, etc. are used. The cooler 21 is located at the middle stage and is provided with a sensor 30 on the side wall facing the connection port with the distiller 13 to measure the internal temperature.

A microcomputer (hereinafter referred to as a microcomputer) 31 controls operations such as opening and closing of valves, activation and deactivation of motors, etc. required for cleaning operations such as liquid supply, drainage, washing, dehydration, drying, distillation, and deodorization. The control block diagram is shown in FIG. The microcomputer 31 has a ROM, a RAM, an arithmetic unit, etc. connected to each other via a bus.

Here, the microcomputer 31 during distillation regeneration of the solvent (trichloroethane (boiling point 74°C)) in this embodiment
The operation will be explained based on FIG. When the power is turned on, it is first checked to see if the pressure switch 29 is on. That is, it is assumed that cooling water is supplied when a dry cleaning operation is started by key operation. When cooling water is not being supplied and the switch 29 is in RFF, a buzzer or the like is used to notify and display the information.

When the switch 29 is ON and the heating key is operated, or when an operation program including the distillation regeneration process is selected using the selection key and the operation starts by operating the start key and enters the distillation regeneration process. The heating flag is set and turned off by the release operation.

Thus, when the heating flag is determined, the heating counter is cleared and the steam supply valves 25 and 26 are opened. Then, the used solvent in the evaporation chamber 23 is heated and distilled at about 130° C. and is sent into the cooler 21. The boiling point of the solvent, the position of the sensor 30,
For example, if the upper and lower temperature limits predetermined by the cooling water temperature are 60°C and 40°C, it is determined whether the temperature measured by the sensor 30 exceeds 60°C, and then the pressure switch 29 is turned OFF. Determine whether or not you have done so. When the temperature exceeds 60℃ or when switch 29 is OFF, valve 2
5 and 26 to notify and display an abnormality in the cooling system. If the cooling system is normal, set the heating counter to 1.
Counting every second, we check whether the upper limit temperature is exceeded or the pressure switch 29 is turned off until 300 seconds (5 minutes). After securing a predetermined time (300 seconds) within which this upper limit temperature is not exceeded, the distillation operation is continued on the condition that the temperature measured by the sensor 30 is within the temperature range of 60°C to 40°C. When the temperature exceeds the lower limit of 40°C, it is determined that there is almost no high-temperature distilled solvent in the cooler 21, the valves 25 and 26 are closed, the heating flag is cleared, and the next heating flag is set. Press the pressure switch 29 until the
The system enters a waiting state while watching the ON-OFF status. This is also the final state.

(G) Effects of the invention According to the invention, the supply of cooling water can be primarily detected using an inexpensive pressure switch, and abnormalities in the cooling system can be detected secondarily using a temperature sensor inside the cooler. However, the completion of work is detected by this temperature sensor, and an abnormality in the cooling system and the end of work can be detected inexpensively and reliably, and an extremely practical dry cleaner can be provided.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the main parts of the invention, Figure 2
The figure is a control block diagram, FIG. 3 is a flowchart for explaining the operation, and FIG. 4 is a piping mechanism diagram. 13... Distiller, 21... Cooler, 25,2
6... Steam supply valve (heating means), 28... Cooling coil, 29... Pressure switch, 30... Sensor, 31... Microcomputer (each discrimination section and heating control section).

Claims (1)

[Scope of utility model registration request] A distiller that heats and distills the solvent to be regenerated by a heating means, a cooler that condenses the distilled solvent by a cooling coil and leads it to a water separator, and detects the supply pressure of the cooling medium in the cooling coil. a pressure switch that measures the temperature inside the cooler; a pressure determination unit that determines whether the pressure switch is activated; and a temperature determination unit that determines whether the temperature measured by the sensor is within a predetermined temperature range. and a heating control section that controls the heating means based on the discrimination signals from the pressure discrimination section and the temperature discrimination section.