JPS6231109Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a driving device for a drain valve or the like of a washing machine.

This type of device energizes an electromagnetic solenoid to pull and drive a drain valve, etc., and when it is returned to its original state, the power is cut off to cause it to return elastically. Since the device is continuously energized during operation, abnormal noise may be generated if the power supply voltage drops. It is also necessary to increase the size of the electromagnetic solenoid in preparation for the rise in temperature. Furthermore, in the case of a drain valve, if the power is cut off during draining, the draining work may not be completed. The present invention has been developed in view of the above points, and an example of a drain valve for a washing machine will be described below with reference to the drawings.

1 is a drain valve installed in the drain channel 2 of the washing machine,
Spring 3 in the direction that the valve is always closed (downward in the figure)
The spindle 4 is elastically biased by the spindle 4 to protrude upward. Reference numeral 5 denotes an operating rod which seesaws with its central portion pivoted, and has one end pivotally connected to the upper end of the spindle 4, and the other end pivotally connected to the upper end of the plunger 7 of the electromagnetic solenoid 6. The electromagnetic solenoid 6 pulls down the plunger 7 and the other end of the operating rod 5 when energized. 8 is an engagement pin protruding from the other end of the operating rod 5; 9 is a normally closed first switch that opens when the operating rod 5 is in its original position; 1;
0 is a normally closed type second switch that opens when the other end of the operating rod 5 is pulled down and moves to the operating position.
These switches 9, 10 are actuated by the actuating rod 5 itself by suitable actuators provided on the actuating rod.

Reference numeral 11 denotes a holding device disposed near the other end of the operating rod 5, which engages and holds the engaging pin 8 at the operating position of the operating rod 5. In this state, the other end of the operating rod 5 is then moved downward. It releases the engagement and retention when it is pulled down. This holding device 11 is a general one, but to explain further, it supports the lower part of the cam 12 in a swingable manner, and is always elastically biased in the direction of one end of the operating rod. A guide surface 13, an engagement surface 14, a second guide surface 15, and a relief surface 16 that slopes forward and backward are formed. That is, the engagement pin 8
It is engaged with the engagement surface 14 while slidingly contacting the guide surface 13, and is then pulled down and slidingly contacted with the second guide surface 15, and when the pulling force is removed, it is moved along the back surface of the inclined relief surface 16. It can be raised without getting stuck.

Figure 2 shows the electrical circuit diagram and shows the electromagnetic solenoid 6
A first switch 9 and a second switch 10 are connected to the switch, respectively, and these switches 9 and 10 are connected to changeover contacts 18 and 19 of a changeover switch 17, respectively.
The changeover switch 17 has a neutral contact 20 and is operated in accordance with a suitable program or manually.

Next, we will explain the operation of the device of this invention.
When driving the drain valve 1 to open, the changeover switch 17 is switched from the neutral position to one of the changeover contacts 19. Then, the electromagnetic solenoid 6 is energized by the second switch 10 and pulls down the plunger 7 and the other end of the operating rod 5. Therefore, the engagement pin 8 is connected to the first guide surface 1
3 and is engaged with the engaging surface 14, the first switch 9 returns to closed state and the second switch 10 opens. Therefore, the electromagnetic solenoid 6 is de-energized and stops its lowering operation, and the other end of the operating rod 5 is held in this operating position because the engagement pin 8 engages with the engagement surface 14 of the cam 12. , one end of the operating rod 5 raises the drain valve 1 against the spring 3 to open it. When returning the drain valve 1 to the closed state, the changeover switch 17 is switched to the other changeover contact 18, the electromagnetic solenoid 6 is energized from the first switch 9, and the plunger 6 and the other end of the operating rod 5 are pulled down. Then, the engagement pin 8 moves to the second guide surface 1
5 and is located at the lower part of the relief surface 16. When the changeover switch 17 is returned to the neutral position, the electromagnetic solenoid 6 loses its downward force, and the plunger 6 and the other end of the operating rod 5 are raised by the spring 3. Further, the engagement pin 8 also rises along the back surface of the relief surface 16 without being engaged. Of course, the drain valve 1 is also returned closed by the spring 3, and the operating rod 5 is also returned to its original position. Further, the first switch 9 is opened, and the second switch 10 is returned to closed.

In addition, when opening the drain valve 1, the changeover switch 17
Even if you accidentally switch to the other switching contact 18, or if you accidentally switch to one switching contact 19 when closing the valve, the first switch 9 and second switch 10 are open, so the valve will not operate at all. It is.

As described above, the device of this invention drives the drain valve, etc.
When returning, the electromagnetic solenoid is energized only at the initial stage of operation, so there is no possibility of incomplete operation or abnormal noise due to a drop in power supply voltage, etc.
Moreover, the electromagnetic solenoid can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram of the device of the present invention, and FIG. 2 is an electrical circuit diagram. DESCRIPTION OF SYMBOLS 1... Drain valve, 3... Spring, 5... Operating rod, 6... Electromagnetic solenoid, 9... First switch, 10... Second switch, 11... Holding device,
17...Switch switch, 18, 19...Switch contact.

Claims (1)

[Scope of utility model registration request] A drain valve, etc. that is always elastically biased in the return direction is attached to one end of the operating rod that seesaws, and an electromagnetic solenoid plunger is attached to the other end of the operating rod, and the operating rod is operated by the electromagnetic solenoid to drain water. In devices that drive valves etc. against elasticity, there is a holding device that holds the operating rod in the operating position and releases the holding when the operating rod is next operated from the operating position, and the operating rod returns to the original position. The electromagnetic solenoid includes a first switch that opens when the switch is in the operating position, a second switch that opens when the operating rod is in the operating position, and a changeover switch that has a neutral and a pair of switching contacts. 1. A drive device for a drain valve, etc., characterized in that a second switch is connected to each other, and a first switch and a second switch are respectively connected to switching contacts of a changeover switch.