JPH0334760B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention comprises a drying chamber containing clothes washed with a petroleum solvent, and a drying chamber connected to the drying chamber to perform constant cooling or heating. The present invention relates to a clothes dryer such as a dry cleaner that includes a circulation path in which a cooler and a heater are sequentially arranged, and a fan that circulates air through a filter in the drying chamber and the circulation path.

(b) Conventional technology The flash point of petroleum-based solvents is approximately 40°C, and when drying at high temperatures, measures such as drawing in outside air and releasing the vaporized solvent to the outside are necessary to reduce the risk of explosion. This made it difficult to recover the solvent using a cooler (see Japanese Utility Model Application Publication No. 190192/1983).

Therefore, it has been considered to send a large amount of air to the heater and supply low-temperature drying air to the drying chamber to perform drying operation while avoiding risks such as drying.

(c) Problems to be solved by the invention However, with this method, when the filter during circulation becomes clogged and the amount of air blown decreases, the drying air is brought down to a high temperature, and the amount of heating by the heater is also large due to the inclusion of the cooler. Therefore, when the cooler or cold water valve is malfunctioning and cannot be cooled, the temperature of the drying air is increased rapidly.

The present invention addresses filter clogging and cooler abnormalities with simple temperature measurements.

(d) Means for solving the problem The solution according to the present invention includes a temperature measuring means that measures the air temperature at the outlet of the cooler and at the inlet of the heater, and a low temperature comparison section that compares the measured temperature with a low reference temperature. and a high temperature comparison section that compares the measured temperature with a high reference temperature, and a display control section that displays filter clogging based on the output of the low temperature comparison section and displays cooler abnormality based on the output of the high temperature comparison section. This is the configuration.

(e) Effect If the cooler outlet temperature is (Ts) when the filter and cooler are normal, then when the cooler is abnormal (for example, when there is a failure in the cold water source or a failure in closing the cold water valve), the cooler outlet temperature is (( Ts) indicates a higher temperature,
When the air flow rate decreases due to filter clogging, the cooling effect becomes stronger, so the outlet temperature shows a temperature lower than (Ts).

Therefore, the measured temperature (Tx) is compared with a high reference temperature (TSH) and a low reference temperature (TSL) using a comparison section, and when TX>TSH, a cooler abnormality is detected.
When TX<TSL, filter clogging is displayed. In particular, when there is an abnormality in the cooler, not only is the display displayed, but the torque motor is used to open the external supply/exhaust port, stop the heater, and lower the temperature and solvent concentration in the drying chamber.

(F) Embodiment The following is a description based on the drawings. The body 1 of a dry cleaner that sequentially executes washing (rinsing), deliquid removal, drying, and deodorizing processes, or a clothes dryer that executes only drying and deodorizing processes. consists of a drying room (or a drying room that also serves as a washing room) 2 for storing clothes washed with petroleum-based solvents, an air circulation path 3 connected to the drying room 2, and a tank 4 for collecting condensed solvent. It's decorated. In addition, a control box 5 containing predetermined electrical components is installed at the top of the aircraft 1.
A clogging indicator light 7 and a cooler abnormality indicator light 8 consisting of operation knobs including a reset button 6, LEDs, etc.
is provided at the top front. A buzzer 9 is also provided.

Inside the drying chamber 2, a motor-driven rotary drum 10 is provided which rotates at a low speed during the drying process.
Inside the circulation path 3, there is a removable filter 11, a fan 12, and a cooler 1 to which cold water is supplied.
3. A heater 14 to which steam is supplied intermittently or continuously is provided in order. In addition, circulation route 3
The downstream side of the fan 12 is supplied with air from the outside by a torque motor-driven supply/discharge valve 15, and is exhausted to the outside.
Furthermore, the circulation path 3 can be cut off, and the torque motor is driven in the event of an abnormality during the drying process and during the deodorizing process.

Downstream (outlet) of the cooler 13 in the circulation path 3 and upstream (inlet) of the heater 14, there is a first temperature measuring means (for example, a thermistor) 16 for measuring the temperature of the blast air.
A second temperature measuring means (also a thermistor) 17 is provided downstream (outlet) of the heater 14 to detect an overheating state.

The electrical components installed in the control box 5 are assembled around a microcomputer 18, and this control circuit is shown in FIG. The microcomputer 18 is
ROM19, RAM20, CPU21, I/O22
It is a general type consisting of an upper limit temperature comparison section 23, a high temperature comparison section 24, a low temperature comparison section 25, which will be described later.
It includes a temperature difference calculation section 26, an abnormal high temperature control section 27, a display control section 28, and a cooler abnormality control section 29. The temperatures measured by the first and second temperature measuring means 16 and 17 are read by the microcomputer 18.

The operating times and operating procedures for the drying process and deodorizing process are stored in the ROM 19 in advance, and when the start key is operated, the operation starts as shown in the flowchart of FIG. During operation, the rotating drum 10 rotates slowly and the fan 12 circulates a large amount of air. Moreover, the cooler 13 and heater 14 also operate.

In this way, a large amount of low-temperature drying air is constantly fed into the drying chamber 2, which penetrates into the clothes and vaporizes the solvent.
The vaporized solvent is cooled by a cooler 13, condensed and liquefied, and collected into a tank 4.

The microcomputer 18 controls the first and second temperature measuring means 1
Read the measured temperatures of 6 and 17, and first set the upper limit temperature (THL) where the second measured temperature (T ₂ ) is, for example, 45°C.
The upper limit temperature comparator 23 compares and determines whether the temperature has reached the upper limit temperature. Next, determine whether the first measured temperature (T ₁ ), which is the cooler outlet temperature after cooling, is higher than the higher reference temperature (TSH) or lower than the higher reference temperature (TSL).
The high temperature comparison section 2 and the low temperature comparison section 25 respectively
Compare and judge based on.

On the other hand, based on the first and second measured temperatures (T ₁ ) and (T ₂ ), the temperature difference calculation unit 26 calculates the temperature (TD=T ₂ −T ₁ ).
Calculate. Then, the calculated temperature difference (TD) is compared and determined with the reference temperature difference (TDS) by the temperature difference comparison section 27.

Here, the upper limit temperature (THL), high and low reference temperatures (TSH) (TSL), and reference temperature difference (TDS) are set in advance.
It is stored in the ROM 19 and called at the time of comparison.

If T ₂ ≧THL during operation, the abnormal high temperature control section 27 stops the heater 14, operates the supply/discharge valve 15 by the torque motor, the display control section 28 blinks both indicator lights 7 and 8, and sounds the buzzer 9. is activated to indicate abnormally high temperature.

When T ₁ >TSH, the cooler abnormality control unit 29 stops the heater 14 and the torque motor closes the supply/discharge valve 1.
5, the display control unit 28 blinks the cooler abnormality indicator light 8 and activates the buzzer 9 to indicate that the cooler is abnormal.

When T ₁ <TSL, the display control unit 28 blinks the clogging indicator light 7 and activates the buzzer 9 to indicate that the filter 11 is clogged.
Driving continues. This filter clogging (lower air flow) can be detected even when TD>TDS. This is because although the cooling effect of the airflow increases due to the decrease in the air flow rate, the heating effect also increases, T ₁ decreases and T ₂ is approximately maintained, resulting in a high temperature difference TD (T ₂ − _{T 1} ). To become.
At this time as well, the display control unit 28 blinks the filter clogging indicator light 7 and activates the buzzer 9.

Once the display control unit 28 is activated in this manner, the display state cannot be canceled unless the reset button 6 is operated. When the reset button 6 is operated, the state returns to the state before the start key was operated.

Incidentally, FIG. 4 shows another embodiment in which the position of the filter 11 is specified. Here, the circulation path 3 is connected to the entrance and exit of the drying chamber 2, and the fan 12, filter 11, and cooler 1 are connected in order from the exit side of the drying chamber 2.
3. A heater 14 is installed, and the drying air heated by the heater 14 is sent to the drying room 2, and the fan 12
An exhaust port 30 to the outside is provided on the downstream side, and an air supply port 31 from the outside is provided on the upstream side. Then, an air supply valve 32 and an exhaust valve 33 are provided which are linked by a torque motor, and during normal drying operation, both valves 32, 33 are
Both ports 30 and 31 are closed, and both ports 30 and 31 are opened by both valves 32 and 33 during an abnormality and during deodorizing operation, and the circulation path 3 between both ports 30 and 31 is closed by an exhaust valve 33. As a result, dry air and outside air that has passed through the filter 11 passes through the cooler 13 throughout the entire operation, and if the cooler 13 and heater 14 are of the finch tube type, the outer surface becomes dirty and the heat exchange area decreases accordingly. etc. are less likely to occur.

(G) Effects of the Invention According to the present invention, the temperature at the outlet of the cooler and the inlet of the heater is measured, and this temperature is compared with a high reference temperature and also with a low reference temperature, and if it is too high, the cooler is abnormal or the temperature is low. If it is too much, it can be determined that the filter is clogged, and this can be distinguished and displayed. Therefore, just by comparing one measured temperature,
To provide an extremely user-friendly clothes dryer that can reliably identify, detect, and display cooler abnormalities and filter clogging.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram of a clothes dryer according to the present invention, FIG. 2 is a front sectional view, FIG. 3 is a flowchart for explaining the operation, and FIG. 4 is a sectional view of another embodiment. 2... Drying room, 7... Clogging indicator light, 8... Cooler error indicator light, 11... Filter, 12... Fan,
13... Cooler, 14... Heater, 17... First temperature measuring means, 18... Microcomputer, 24... High temperature comparison section, 2
5... Low temperature comparison section, 28... Display control section.

Claims (1)

[Claims] 1. A drying room containing clothes washed with petroleum solvent, a circulation path connected to this drying room and equipped with a cooler and a heater for constant cooling or heating, and a drying room and a circulation path. and a fan for circulating air through a filter, further comprising a temperature measuring means for measuring the air blowing temperature at the outlet of the cooler and at the inlet of the heater, and a low temperature comparison section for comparing the measured temperature with a low reference temperature. A high temperature comparison section that compares the measured temperature with a high reference temperature, and a display control section that displays filter clogging based on the output of the low temperature comparison section and displays cooler abnormality based on the output of the high temperature comparison section. A clothes dryer for dry cleaning that features: