JPH0140166Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a DC solenoid for washing machines used in general households.

Conventional Structures and Their Problems Conventionally, this type of washing machine, for example, a single-tub centrifugal dehydrating washing machine, has the structure shown in FIGS. 1 and 2. In FIGS. 1 and 2, 1 is an outer tank for receiving washing water, 2 is a washing and dewatering tank installed inside the outer tank 1, and a pulsator 3 is installed at the bottom, and a pulsator 4 and a collection net 5 are installed at the top. At the same time, a large number of small holes 6 are provided on the outer periphery. 7 is a mechanical case that is fixed to the bottom of the outer tub 1 at the top, transmits the rotation of the washing motor 8 to the pulsator 3, transmits the rotation of the dehydration motor 9 to the washing and dehydration tank 2, and also serves as the washing and dehydration tank when the dehydration is stopped. A brake device 10 is provided inside to stop the rotation of the pulsator 2, and below there is a washing pulley 13 that transmits rotational force from the washing motor pulley 11 to the pulsator 3 via the washing belt 12. A dewatering pulley 16 is provided for transmitting rotational force to the washing/dehydrating tank 2. A body 17 suspends the washing and dewatering tub 2 and the outer tub 1 via a suspension 18, and has a lid 19 fixed to the upper part and legs 20 fixed to the lower part. Outer tank 1
There is a drain valve 21 directly connected to the drain port (not shown) at the bottom of the , and a drain hose 2 is connected to the outside from the drain valve 21
Drain according to step 2. The drain valve 21 is a plunger 23 of a solenoid 23 fixed to the bottom of the outer tank 1.
It is operated by a connector 24 directly connected to a, and a brake arm 25 is operated by a solenoid 23 to perform a brake operation when dehydration is stopped. The operation in the above configuration will be explained below. Outer tank 1
When laundry and detergent water are put in the washing machine and the power is turned on, the washing motor 8 rotates, and the rotation is transmitted to the pulsator 3 via a washing motor pulley 11, a washing belt 12, and a washing pulley 13. During washing, the starting operation capacitor is replaced by the main coil 8a and the auxiliary coil 8b at regular intervals, so the direction of rotation is changed. Further, since the solenoid 23 is not powered on during washing, the drain valve 21 is closed and the brake device 10 is activated to prevent the washing and dewatering tub 2 from rotating together during washing. When washing is completed, the power to the washing motor 8 is cut off and rotation stops, and the solenoid 23 is energized, so the brake device 10 is released and the drain valve 21 is opened to drain water. After draining, the dewatering motor 9 is turned on and rotates, and the dewatering motor pulley 14, the dewatering belt 15,
The washing and dehydrating tub 2 rotates via the dehydrating pulley 16. When the dehydration is completed, the dehydration motor 9 stops, and at the same time, the power to the solenoid 23 is cut off, so the brake device 10 is activated and the washing/dehydration tank 2 suddenly stops.
Then, the drain valve 21 is closed. The solenoid 23 that operates in this washing process will be described next. There are two types of solenoids: AC solenoids and DC solenoids. A feature of AC solenoids is that the reactance of the coil is extremely large compared to the resistance, so the current changes greatly depending on the stroke of the plunger. At this time, the larger the stroke, the larger the current flows, the greater the force can be obtained, and the fewer coils are required. Furthermore, although the current decreases after adsorption, as long as the adhesion is sufficient, the adsorption force can be maintained sufficiently, and the rise in temperature of the coil can be suppressed to a low level. However, if the plunger is not in close contact with the plunger during suction or adhesion, electromagnetic noise will be generated and a large amount of current will flow, resulting in burnout in many cases. In addition, the adsorption speed is fast, and there are drawbacks such as high collision noise when the adhesion occurs. On the other hand, in the DC solenoid, a steady current flows only due to the DC resistance of the coil regardless of the stroke, so the amount of the coil is set to obtain the current necessary for adsorption. Therefore, in order to obtain a large attraction force, a large amount of coils is required, and since the same current flows even after the two are in close contact, the temperature rise becomes high. In order to prevent this problem, a method is used in which the number of turns is increased to suppress the current and increase the magnetomotive force, but this method has the disadvantage of increasing the amount of coils and making it expensive. However, it has the advantage that the speed of contact is relatively slow and the impact noise is low, there is little risk of burnout even if the contact is not sufficient, and there is no electromagnetic noise. From the above points, conventional DC solenoids separate the coil that generates magnetomotive force into an attraction coil and a holding coil after close contact, and the attraction coil is wound with a thick wire diameter to flow a large current and generate a large magnetomotive force. The efficiency of the magnetomotive force improves after close contact.
By switching to a holding coil wound with a thin wire diameter and reducing the current to maintain close contact, the temperature rise of the coil is kept low.
From the above, it has been possible to obtain a small size and large suction power at a low cost, but in this way, the structure is complicated and the coil is divided into parts and a changeover switch etc. are installed. Problems such as water splashing, seizure of contacts due to dripping of condensed water, leakage and burnout due to poor insulation, and malfunction due to rust on the plastic gear were occurring.

Purpose of the invention This invention solves these conventional problems, improves the quality of the suction coil and holding coil switching parts, and simultaneously incorporates a capacitor power selection switch for the washing motor and dehydration motor, thereby increasing efficiency. The present invention provides a DC solenoid for a washing machine which is compact, improves quality, and reduces costs.

Structure of the invention The DC solenoid for a washing machine of the invention divides a coil that generates a magnetomotive force that opens and closes a drain valve communicating with a washing tub into a primary coil and a secondary coil, and switches the power supply to the coil. A switch section is provided on the side, and a washing/dehydration switching switch that opens and closes with the action of a plunger is installed so as to be closed from above the coil changeover switch part, and the coil switching and washing/dehydration switching are performed by the action of the plunger. With this configuration, it is possible to prevent washing water from scattering, insulation failure due to dripping of condensed water, and burnout.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 2 in Figures 3, 4, 5, and 6.
Reference numeral 3 designates the main body of the DC solenoid, and there is a bobbin 23c with a hole 23b inside, and on the outer periphery of the bobbin 23c there is a primary coil 23e which is a suction coil wound with a thick wire, and a thin coil wound after the primary coil 23e. A secondary coil 23f, which serves as a coil for maintaining close contact, is wound with a wire diameter. On the other hand, the actuator 2 operates as the plunger 23a moves in and out.
A changeover switch 23h for changing over the above-mentioned two coils is provided by 3g, and a push switch 26 for changing over between the washing motor 8 and the dewatering motor 9 is further mounted on the upper surface of the switch 23h, which also serves as a lid. Both ends of the coil are directly connected to a power source through external terminals 27. Note that 30 is a pin for operating the push switch, and 31 is a solenoid board.

The operation of the above configuration will be explained below. During washing, power is applied to terminals A and B, but not to terminal C. Therefore, the push switch 26 is electrically connected to the washing motor 8, and the washing motor 8 rotates. Then, the rotation direction is reversed by a capacitor switch 29 which switches the capacitor 28 so that the voltage is applied to the main coil 8a and the auxiliary coil 8b of the washing motor 8. At this time, plunger 2
3a is in a pulled out state, the brake device 10 is activated, and the washing/dehydration tank 2 is fixed. Moreover, the drain valve is closed. Next, when power is applied to C, the plunger 23a is attracted by the magnetomotive force of the primary coil 23e of the DC solenoid 23, and the pin 3
0, the push switch 26 is switched, power is applied to the dehydration motor 9, and the washing/dehydration tub 2 is rotated. At this time, the DC solenoid is connected to the secondary coil 2.
3f by the action of the changeover switch 23h, and the brake device 10 is also in an open state. Furthermore, the drain valve 21 is open. The DC solenoid 23 has a switch section 23 at the bottom of the outer tank 1.
h is directed downward, and the changeover switch portion 23h is closed by a push switch 26.

Effects of the Invention As is clear from the above embodiments, the DC solenoid for a washing machine of the present invention has a changeover switch that is attached to the bottom of the washing and dehydration tank facing downward, and furthermore, a lid body that closes off the changeover switch. By using a push switch that switches the power supply to the washing motor and dehydration motor and allows one capacitor to be shared by both motors, rust can be prevented due to splashing of washing water or dripping of condensed water. It can prevent malfunctions, electric shocks due to poor insulation, burnout, malfunctions, and contact seizure.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a conventional dehydrating and washing machine.
Fig. 2 is a bottom view of the same dehydrating/washing machine, Fig. 3 is a perspective view of a DC solenoid showing an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the DC solenoid, FIG. 5 is a front view showing how the DC solenoid is installed, and FIG. 6 is an electrical circuit diagram of a washing machine that uses the DC solenoid. 2...Washing and dehydration tank, 21...Drain valve, 23...
...DC solenoid, 23e...Primary coil, 23
f...Switch switch, 26...Push switch that also serves as a lid.

Claims (1)

[Scope of utility model registration request] The coil that generates the magnetomotive force that opens and closes the drain valve that communicates with the washing tub is divided into a primary coil and a secondary coil, and a switch section that switches the power supplied to the coil is installed on the side, and the valve can be opened and closed by the action of a plunger. A washing/dehydration switching switch that operates is installed so as to close it from above the switching switch section, and by the operation of the plunger,
A DC solenoid for washing machines that switches coils and switches between washing and dehydrating.