JPS5817638B2 - dry cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION By connecting a common delay relay to each pressure switch that detects the liquid level in the solvent tank and the washing tub, the air trap is activated each time each pressure switch is activated. The aim is to supply fresh air to the

Dry cleaners are subject to various laws if they use a large amount of solvent, so the idea is to make the solvent tank as small as possible and use all the solvent in the tank effectively during washing operations. If the amount of solvent in the tank decreases even slightly, - even if the solvent is transferred to the washing tub using a pump, the pressure switch that detects the liquid level in this washing tub will not reach the level that activates, and the above-mentioned The pump may run continuously and suck in air, potentially overheating the pump.

Therefore, when the solvent tank is made smaller, it is necessary to provide a pressure switch in the solvent tank in addition to the washing tub, and to use this pressure switch to stop the pump when the tank is empty.

On the other hand, with pressure switches that use air traps, the air in the air trap dissolves into the solvent little by little, so there is a risk that the pressure switch will become inaccurate if used for a long period of time. To do this, it is necessary to occasionally supply fresh air into the air trap.

The present invention provides a single delay relay to supply fresh air to the husband's pressure switch, which detects the liquid level in the washing tub and solvent tank, each time it is activated.

The present invention will be explained below with reference to the drawings. 1 is a solvent tank, which has a peephole 2 on the side and a pressure switch 4 for liquid level detection connected to the bottom via an air trap 3. 7 is a liquid supply pump for transferring the solvent in the solvent tank 1 to the washing tub 6 during the liquid supply process, and 7 is a pressure equalizing pipe.

The washing tub 6 is provided with an air vent pipe 8 at its upper end, has a drum 9 rotatably installed therein, and has a button trap 10 connected to its lower end.

This button trap is used to catch buttons and lint that are torn during washing.

11 is a washing pump that rotates during the washing process and during solvent recovery;
3. It circulates with the washing tub 6, and when recovering the solvent, the solvent in the washing tub 6 is returned to the solvent tank 1 through a button trap 10, a washing pump 11, a filter 12, and a three-way valve 13. .

Therefore, the three-way valve 13 opens one passage a during the washing process and opens the other passage a during solvent recovery.

The button trap 10 includes an air trap 1.
A pressure switch 15 is connected to the washing tub 6 via a button trap 10.
It is designed to detect the liquid level.

0 is an overflow pipe 5, and if too much solvent is put into the solvent tank 1, the excess solvent will flow into the button trap 10 through this overflow pipe 0.
Excess solvent can be removed by opening the drain valve 16 connected to the bottom of the button trap.

17 is a filter drain valve, which is normally closed, but if this valve 17 is opened when it is necessary to drain the solvent from the filter, the solvent will move into the button trap 10 and the drain valve 16 will be opened. This solvent can also be extracted by opening it.

Figure 2 is an electrical circuit diagram, and 18 and 19 are the first and second program switches, of which the first program switch 18 closes its contacts when the program timer is set and the start switch is pressed, and all 2 The second program switch 19 is opened at the end of the process, and the second program switch 19 is closed during the washing process and opened after the solvent recovery process.

20 is a washing circuit, 21 is a washing relay, and has a normally open contact 21a when energized.

21b and 21c are closed, and normally closed contacts 21d and 21e2 are opened, and are connected in series with the second program switch 19, respectively.

The three-way valve 13 is also connected in series to the second program switch, and when the three-way valve is energized, one of the passages a is opened, and when it is de-energized, the other passage a is opened.

The pressure switch 4 on the solvent tank side and the pressure switch 15 on the button trap side have a normally open contact NO that closes when a certain amount of solvent is supplied, and a normally closed contact NC that closes when the amount is below a certain amount. A delay 3 relay 22 is connected to each normally closed contact.

This delay relay 22 has a delay contact 22a when a certain period of time has passed after energization.

22b is switched from the normally closed contact NC side to the normally open contact No side.

23 is a washing pump electromagnetic switch for energizing the washing pump 11, and when energized at 4, current flows through the washing pump 11 to rotate it, and the normally open contact 23a
I'm trying to close it.

, and 24 is an electromagnetic switch for the liquid supply pump 5 for energizing the liquid supply pump 5. When energized, current flows through the liquid supply pump 11 to rotate it, and the normally open contact 24
I'm trying to close a.

Reference numeral 25 denotes a self-holding relay that is energized during the dewatering operation, and when energized, the relay 25 closes the contact 25a to self-retain and maintains the energization to the dewatering circuit 26.

The operation will be explained below.

When the program timer morph is energized and the start switch is pressed, the first and second program switches 18 and 19 close, current flows through the three-way valve 13, and the three-way valve opens one passage a and closes the other passage a. .

At the same time, current also flows through the laundry relay 21, opening the normally closed contacts 21d and 21e, and opening the normally open contact 21a.

21b and 21c are closed.

On the other hand, since there is a certain amount of solvent in the solvent tank 1, the pressure switch 4 is closed to the normally open contact No side.

Therefore, current flows through the normally open contact NO and the normally open contact 21b of the laundry relay to the liquid supply pump electromagnetic switch 24, which rotates the liquid supply pump 5 and supplies the solvent in the tank 1 to the washing tub 6. At the same time, the self-holding contact 24a is closed.

By the operation of the liquid supply pump 5, the liquid level of the solvent in the tank 1, which was at the A position, falls, and when it reaches the B position, the pressure switch 4 switches its contact to the normally closed contact NC side.

Normally, the liquid supply pump 5 would stop at this time, but
In the present invention, since the self-holding contact 24a is closed, current continues to flow to the electromagnetic switch 24 for the liquid supply pump, and the liquid supply pump 5
continue to operate.

As the pump continues to operate, the liquid level in the solvent tank 1 drops to point C, and new air is replenished into the air trap 3.

On the other hand, when the pressure switch 4 switches to the normally closed contact NC side, current flows through the delay relay 22, and when the liquid level in the solvent tank 1 reaches point C, the delay relay 22 operates to close the delay contact 22b. Since the normally closed contact NC side is switched to the normally open contact No side, the power to the liquid supply pump electromagnetic switch 24 is cut off, and the liquid supply pump 5 is stopped.

At this time, the delay contact 22a is also switched to the normally open contact No side,
In addition, since the solvent level in the washing tub 6 has risen, the button trap side pressure switch 15 is closed to the normally open contact No side, and current flows to the washing pump electromagnetic switch 23 to energize the washing pump 11. Then, this is rotated to circulate the solvent, and the washing circuit 20 is energized to rotate the drum 9 in the washing tub, and the self-holding contact 23a is closed.

Washing is carried out in this manner, and when a predetermined time has elapsed, the program switch 19 is opened.

When this switch is opened, no current flows through the laundry relay 21, so the normally open contacts 21a, 21b, 21c open and the normally closed contacts 21d, 21e close.

Therefore, the current that has been flowing to the delay relay 22 through the normally open contact 21b and the pressure switch 4 on the solvent tank side is cut off, so the delay contacts 22a and 22b return to their original states and close to the normally closed contact NC. .

Also, since current no longer flows to the three-way valve 13, the valve switches to open the passage side.

On the other hand, as the normally closed contact 21d closes, current continues to flow to the washing pump electromagnetic switch 23 through this contact and the normally open contact NO of the pressure switch 15, and the washing pump 1
Continue 1 rotation.

Therefore, the solvent in the washing tub 6 is collected by the washing pump 11 into the solvent tank 1 through the filter 12 and the three-way valve 13.

When the liquid level of the solvent in the washing tub 6 decreases due to recovery, the pressure switch 15 on the button trap side switches the normally open contact NO.
The contact is switched from to normally closed contact NC, and current flows through the delay relay 22.

Even if current flows through the delay relay, the delay contact 22 remains for a certain period of time.
Since the contact a remains closed to the normally closed contact NC side, current continues to flow to the laundry pump electromagnetic switch 23 through this normally closed contact and the self-holding contact 23a, and the laundry pump 11 continues to rotate.

Therefore, the liquid levels in the washing tub 6 and the button 1 spatula 10 continue to fall, and new air is replenished into the air trap 14 of the pressure switch 15.

When a certain period of time elapses after the delay relay 22 is energized, the delay contact 22a opens.

22b closes to the normally open contact NO side, the self-holding of the electromagnetic switch 23a for the washing pump is released, and the washing pump 1
1 stops.

On the other hand, when the delay contact 22b closes to the NO side of the normally open contact, the dewatering circuit 26 operates, and current flows through the self-holding IJL--25, closing the contact 25a and continuing the dewatering operation.

Then, when the time comes, the program switch 18 is opened and all operations are completed.

As described above, the present invention is provided with the pressure switch 4 that detects the liquid level in the solvent tank in addition to the pressure switch 15 that detects the liquid level in the washing tub, so even if the capacity of the solvent tank 1 is small, the solvent tank The liquid supply port/pipe 5 for transferring the solvent from the washing tub 1 to the washing tub 6 will not run dry, so the pump will not be burnt out, and the normally closed contacts of the side pressure switches 4 and 15 will not run dry. Since the delay relay 22 is connected to the side to stop the liquid supply pump 5 and the washing pump 11, the pressure switches 4 and 15 are turned off every time the liquid level in the solvent tank 1 and the washing tub 6 decreases. New air can be replenished into the air trap, and it is possible to eliminate the drawback that the air in the air trap dissolves into the solvent, reducing the amount of air and causing the thousand-point switch to malfunction.

Furthermore, since the washing process or the dehydrating process is started by opening and closing the delay contacts by the delay relay 22, various operations can be performed by one delay relay 22, and the electrical circuit can be simplified. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a solvent circuit diagram of the washing machine of the present invention, FIG. 2 is an electric circuit diagram, and FIG. 3 is a diagram showing the connection between a solvent tank and a pressure switch. 1...Solvent tank, 6...Washing tub, 4
......Solvent tank side pressure switch, 15...
... Button trap side pressure switch (pressure switch that detects the liquid level in the washing tub) 22 ... Delay relay.

Claims (1)

[Claims] 1 The pressure switch that detects the liquid level in the solvent tank and the pressure switch that detects the liquid level in the washing tub have a normally open contact that closes when there is more than a certain amount of solvent, and a normally open contact that closes when the amount falls below a certain amount. A common delay relay is connected to the normally closed contacts of both pressure switches, and the hub pump is stopped when the solvent is supplied from the solvent tank to the washing tub and when the solvent is recovered from the washing tub to the solvent tank. and replenishing new air into the air trap of each pressure switch by delaying the
A dry cleaner characterized in that a washing process or a liquid removal process is started when the delay relay is activated.