JPS59149010A - Solenoid for washing machine drain valve - Google Patents

Abstract

PURPOSE:To contrive inprovement and stabilization in quality and efficiency, miniaturization, lightweightedness, degree of serviceability and reduction in cost of production by a method wherein the terminal used for connection of the starting and finishing parts of each coil, the terminal for the change-over switch of each coil and the terminal for commutation circuit are used in common. CONSTITUTION:A suction coil 23-a with which a relatively strong sucking force can be obtained and a holding coil 23-b having relatively small sucking force which is used to hold a plunger 11-b, which comes in close contact with a fixed core 11-c, are wound around the outer circumference of a bobbin 22, and the starting and ending parts of winding are respectively wound on the terminal 24 which is fixed to the front side face of the bobbin 22. A printed substrate 28, on which a diode 27 will be arranged and fixed in bridge form, is fixed in the gap 26 located between the front side face of the bobbin 22 and the external frame 25, and a terminal 24 is connected to the prescribed position. Besides, a change- over switch 29, with which the suction coil 23-a and the holding coil 23-b will be switched, is fixed to the gap 26 in the constitution of a fixed contact part 29-a and a movable contact point 29-b.

Description

[Detailed description of the invention] Industrial applications The present invention provides a brake device using a DC solenoid.

This relates to washing machines that operate drain valves, etc.

21. Construction of the conventional example and its problems A conventional single-tub centrifugal dehydrating washing machine has a structure as shown in FIG. 1 is an outer tank that receives washing water, 2
1 is a washing and dehydrating tank provided inside an outer tank 1, which has a pulsator 3 at the bottom and a large number of small holes 4 for draining water on the side wall. Reference numeral 6 denotes a mechanical case, which has a mechanism for transmitting the drive of the motor 6 so as to rotate only the pulsator 3 during washing, and to rotate the washing and dewatering tank 2 during dehydration. Motor 6 is
Drive is transmitted to the mechanical case 6 by a belt 7 and a pulley 8. 9 is a drain valve of the outer tank 1; 1o is a brake arm; 11 is a solenoid that pulls the drain valve 9 and the brake arm 10i; 12 is a support plate; motor 6
, mechanical case 6, etc. are arranged, rod 13, 9 outer tank 1
It is supported by 4. 16 is a balancer provided at the top of the washing and dewatering tank, and 16 is a drain hose.

Next, use FIG. 2 to explain the operation of the solenoid 11.

Explain. The drain valve 9 is connected to the drain valve 9 via a connecting member 17. Brake wheel 18 is located inside 3'-) of mechanical case 6. and brake band 19
The brake band 19 is attached to the brake wheel 18 in a manner that it can be press-contacted to and detached from the brake wheel 18 to perform a braking action, and the rotation of the brake wheel 18 is transmitted to the rotation of the washing and dewatering tub 2. That is, when the brake band 19 is pressed, the brake wheel 18 does not rotate, so the washing and dehydrating tub 2 also does not rotate, but during washing,
Since the solenoid 11 is not energized, the drain valve 9 is closed by the force of the built-in spring and the brake spring 2°, and the brake wheel 18Fi is pressed against the brake band 19 and rotates, so the washing and dewatering tank 2 is closed. The pulsator 3 does not rotate, and only the pulsator 3 rotates completely for washing. During drainage and dewatering, the solenoid 11 is energized and the plunger 11-a of the solenoid is attracted.
The connecting member 17 connected to this moves in the direction of the arrow, and as the drain valve 9 opens, the brake arm 1° rotates, and the brake band 19 moves towards the brake wheel 18.
It separates from the water and starts a dehydration operation.

Special Opening 1V59-149010 (2) As described above, the solenoid 11 was used to open and close the brake device and drain valve 9 of the washing and dehydrating tank 2.

There are two types of solenoids: AC solenoids and DC solenoids. As shown in FIGS. 2 and 3, these solenoids consist of a coil 11-a that generates a magnetic field, a plunger 11-b that moves when attracted, and a fixed fixed core 11
-C, and their characteristics can be listed as follows.

In the AC solenoid, the reactance of the coil 11-a is extremely large compared to the resistance, so the current changes depending on the stroke, and at this time, the larger the stroke, the larger the current flows. On the other hand, in a DC solenoid, the steady current is determined only by the DC resistance of the coil 11-a regardless of the stroke, and the attractive force is determined by the magnetomotive force, which is given by the product of the current and the winding. It can handle a large load with a larger stroke than a DC solenoid compared to the amount of copper in the coil 11-a.

Therefore, in a single-tank centrifugal dehydrating washing machine, AC 61
゛Solenoids are common, but AC solenoids tend to burn out if voltage is applied for a long time without the plug/jaw 11-b being completely attracted because the current value changes depending on the stroke. Since it is used, it has the disadvantage that it tends to generate warping even when a slight gap is created. As can be seen from these facts, in an AC solenoid, it is necessary to completely attract the plunger 11-b and the fixed core 11-C, so the plunger 11-b and the fixed core 1
It is not possible to use a cushioning material to eliminate the impact noise with 1-C, and the AC solenoid is better for plunger 11.
-b has a drawback that the acceleration is large and the impact is large. Therefore, when using an AC solenoid, there is always a loud impact sound, which is noisy, but a DC solenoid does not have the above-mentioned problems and has a quiet structure, so the DC solenoid is advantageous in terms of performance. be. However, as mentioned above, in a single-tub centrifugal washing machine, the stroke is 10
If you create a DC solenoid with 6 pages that satisfies the suction force and temperature rise, the coils 11- and a will be very large because the load is larger than ML and the current is continuously energized for several minutes or more during draining and dewatering. There was a problem. It means that the magnetomotive force is the coil 1
Since it is determined by the wire diameter of the copper wire in 1-a, in order to attract the specified load, a fairly thick wire diameter must be used, and in order to maintain it, the power must be kept to about 10 watts. Because of the necessity, I had to make the resistance value quite large. Therefore, if the coil 11-a had a very large amount of copper, there was a problem that the price would be several times higher than that of an AC solenoid.

For this reason, there are DC solenoids that incorporate the idea of dividing the coil into an attraction coil and a holding coil to reduce the amount of copper in the coil and maintain the attraction force, but this type of solenoid has a complicated switching device. However, there were problems in that many of them were generally cluttered, large in appearance, and expensive in cost.

Purpose of the Invention The present invention solves these conventional problems and provides a 7'-" solenoid for washing machine drain valves that achieves stable improvement in quality performance, is compact, lightweight, improves serviceability, and reduces costs. It is something to do.

Structure of the Invention The solenoid for a washing machine drain valve of the present invention uses a direct current solenoid as the solenoid that operates the drain valve communicating with the washing tub.
The coil that generates the magnetomotive force of this DC solenoid is divided into an attraction coil with a strong attraction force and a holding coil that holds the plunger adsorption layer, and a changeover switch for both coils and a rectifier circuit that converts it into a DC power source. , is arranged in the gap between the front side of the bobbin on which the coil is wound and the outer frame, and the coil processing at the start and end of winding of the suction coil and the start and end of winding of the holding coil is performed by connecting the terminal of the aforementioned changeover switch and the rectifier circuit. Since the rectifying circuit is fixedly connected to the respective predetermined terminals to be formed, the rectifying circuit can be integrally wired with a printed circuit board or the like.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Figures 4 to 6, a cylinder part 21 is shown in the center.
On the outer periphery of the bobbin 22, there is a suction coil 23-a that can produce a relatively large suction force, and a holding coil 23 that has a relatively weak suction force to hold the fixed core 11-C after the plunger 11-b comes into close contact with the fixed core 11-C. -b is wound, and the beginning and end of each winding are wound around a terminal 24 fixed to the front side of the bobbin 22. A printed circuit board 2, on which a diode 27 is arranged and fixed in the form of a plastic IJ, is fixed to the gap 26 between the front side surface of the bobbin 22 and the outer frame 260, and is connected to the aforementioned terminal 24 at a predetermined position.

Further, a changeover switch 29 for switching between the attraction coil 23-a and the holding coil 23-b is fixed to the gap 26, and is configured by a fixed contact 29-a and a movable contact 29-b. Further, when the plunger 11-b comes into contact with the movable contact 29-b and is completely sucked, the flange 11-d of the hole 25 formed in a part of the outer frame 25
An actuator 30 is provided which moves in and out of the -& to operate the movable contact 29-. The ends of the movable contact 29-b and the fixed contact 29-a are each fixed to the bobbin 22, and are connected to the external power terminal 3 from a part of the printed circuit board 28.
1 protrudes outside the outer frame 9'/' pad 26.

To explain the operation in the above configuration, when AC power is applied between AB, the diode 27 (Dl, D2.D3.D4) fixed in a bridge shape to the printed circuit board 28 provided in the gap 26 between the bobbin 22 and the outer frame 26 Full-wave rectified DC power is applied between the CDs.

Before the plunger 11-b is sucked, the actuator 30 protrudes from the front surface of the outer frame 25, and the fixed contact 29-a and movable contact 29-b of the changeover switch 29 are in a closed state (I side in FIG. 6). Since voltage is applied to the attraction coil 23-& side, a magnetomotive force is generated, and the plunger 11-
Aspirate b. The attraction coil 23-a is formed of a thick conductive wire, and is set so that it can generate a strong attraction force, although it has the drawback that the input is high and the temperature becomes too high when operated for a long time because it passes a large amount of current. When the plunger 11-b is completely attracted, the actuator 30 is pushed down by the action of the flange 11-d, and the fixed contact 29-a and movable contact 29-b of the changeover switch 29 are opened (Fig. 6). 0 position). Therefore, the power is applied to the 10''''-ji retaining coil 23-b, and the current value decreases so that it can withstand long-term connection.At this time, the plunger 1
1-b is in close contact with the fixed iron core 11-C and the magnetic circuit is completely closed, so the attraction effect is high and a sufficient holding force can be obtained with a small current.

Now, regarding the terminals and wiring of such a rectifier circuit, the positions indicated by A to H of the X mark in FIG. 6 correspond to A to H in the wiring diagram of FIG. 6, and there are 41 coils.

Wires can be automatically connected by wrapping the terminal directly around the terminal C.

Effects of the Invention As described above, the solenoid for a washing machine drain valve of the present invention particularly has a terminal for connecting the winding start and winding end of each coil,
Since the terminals of each coil selector switch and the rectifier circuit terminals are shared, a rational and simple structure can be obtained without unnecessary terminals, making it compact, lightweight, and inexpensive. It is something that can be done.

[Brief explanation of the drawing]

Figure 1 shows a dewatering/drying 1111 with a conventional solenoid installed.
Figure 2 is a schematic cross-sectional view of the washing machine; Figure 2 is a plan view of the drain valve;
FIG. 3 is a perspective view of a conventional solenoid, FIG. 4 is a sectional view of a DC solenoid according to an embodiment of the present invention, and FIG. 6 is a perspective view of a conventional solenoid.
The figure is a view taken from the arrow 1-1 in FIG. 4, and FIG. 6 is a wiring diagram of the solenoid. 11...Solenoid, 11-a...Plunger, 22...Bobbin, 23-a...
...Attraction coil, 23-b...Holding coil, 2
6... Outer frame, 27... Diode, 2
9: Changeover switch, 29-a: Fixed contact, 29-b: Movable contact. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 25 Mouth 24 JP-A-59-149010 (5) Figure 6

Claims (1)

[Claims] The solenoid that operates the drain valve that communicates with the washing tub is a DC solenoid, and the coil that generates the magnetomotive force of this DC solenoid is composed of a suction coil with strong suction force and a holding coil that holds the plunger after attracting it. A switch for switching both coils and a rectifier circuit for converting the coils into DC power are arranged in the gap between the front side of the bobbin around which the coil is wound and the outer frame.
Coil processing at the start and end of winding of the holding coil is as follows:
A solenoid for a washing machine drain valve, which is fixedly connected to a terminal of a changeover switch and a predetermined terminal forming a rectifier circuit.