JPS633637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a solenoid valve device having a structure in which a valve stem insertion portion and the like are water-sealed by a bellows.

For example, this type of solenoid valve device applied to a two-tub washing machine is installed between the drain port of the washing tub and the drain hose, and drains the waste water in the washing tub to the outside according to a series of strokes. ing.

In such a valve device, a valve body sealed with a bellows is arranged in a valve case having a fluid passage, that is, a valve port, which communicates between a drain port and a drain hose, and the valve stem is connected to an electromagnetic plunger. As the electromagnet is turned on and off, the plunger moves back and forth to open and close the valve opening using the valve body. However, in such a configuration, the metal plunger is attracted to the electromagnet every time electricity is applied, that is, when water is drained, so it directly collides with the iron core of the electromagnet, producing a metallic sound as noise.

The present invention has been made in view of the above circumstances, and its purpose is to provide a solenoid valve device that can suppress the generation of noise caused when a plunger collides with an iron core or the like due to energization of an electromagnet with a simple configuration. be.

A first embodiment in which the present invention is applied to a two-tub washing machine will be described below with reference to FIGS. 1 to 3.
1 is an outer box of a two-tub washing machine, and 2 is a washing tub disposed inside the outer box 1.

Now, reference numeral 3 denotes a valve device, which is provided within the outer box 1 and located below the washing tub 2, and will be described below. Reference numeral 4 denotes a sealed valve case, and in the center of the upper surface thereof, there is an insertion tube portion 4 that acts as an insertion opening.
a is integrally erected in a penetrating state, and an inlet body 4b and an outlet body 4c are provided at the side and bottom of the valve case 4.
are provided in a protruding manner to form a series of fluid passages 4d. Further, the inlet body 4b is connected to the drain port 2a of the washing tub 2 via the communication pipe 5, and the outlet body 4c is connected to the drain hose 7 via the drain pipe 6. Of the inlet body 4b and the outlet body 4c within the valve case 4, for example, the inlet portion of the outlet body 4c is used as the valve port 8. Reference numeral 9 denotes a bellows formed in a cylindrical shape from a rubber material, which is disposed within the valve case 4, and whose upper open end is watertightly attached to the upper surface of the valve case 4 so as to surround the insertion cylinder portion 4a. The valve body 10 is fixed to the valve body 10 and the lower surface thereof is closed to form a valve body 10 so that the valve port 8 can be opened and closed. Reference numeral 11 denotes a compression spring, which is interposed between the upper surface of the valve case 4 and the closing surface of the bellows 9.
The valve body 10 always urges the valve port 8 in a direction to close it. On the other hand, 12 is a washing timer (not shown)
This electromagnet is constructed by winding an excitation coil 14 around a cylindrical coil bobbin 13 and incorporating it into an iron core 15. A pair of corner coils 16 are attached to the lower end surface of the electromagnet. It is set up. A plunger 17 is inserted into the coil bobbin 13 of the electromagnet 12, and the corner coil 16 is attached to the lower end of the plunger.
Adsorption part 17a with a flat surface facing the arrangement part
The suction portion 17a is connected to the upper end of the valve stem 19 via a rod 18 by a pin 18a. The valve stem 19 is inserted vertically and slidably into the insertion tube 4a of the valve case 4, and its lower end is fixed to the closing surface of the bellows 9, that is, to the valve body 10. Air flow passage 2 oriented in the axial direction by cutting the side surface to a predetermined depth
0 is formed. When the electromagnet 12 is energized, the airflow passage 20 is connected to the bellows 9 until the plunger 17 moves to a position immediately before colliding with the iron core 15, etc.
The inside is communicated with the outside of the valve case 4 via the insertion cylinder portion 4a. In order to satisfy this requirement, in this embodiment, the movement stroke of the plunger 17 is set to L.
1 (the stroke of the valve body 10 is the distance from the closed position of the valve port 8 shown by the two-dot chain line in FIG. 2 to the position reaching the valve port 8 shown by the solid line), the valve body 10
The bellows 9 of the air flow passage 20 in the closed position
The distance L 2 between the lower end surface 20a located inside and the lower end surface located inside the bellows 9 of the insertion tube portion 4a is _the above-mentioned L ₁
The dimensional relationship of each part is set so that the airflow passage 20 protrudes and extends from the upper end of the insertion cylinder part 4a in this state.

Next, the operation of the above configuration will be explained. When the washing process of the item to be washed is completed and the electromagnet 12 is energized by the washing timer, the plunger 17 moves the electromagnet 1
2, the upper end of the plunger 17 contacts the iron core 15 through the coil bobbin 13, and the suction portion 17a contacts the lower end surface of the iron core 15. Accordingly, the valve rod 19 moves upward against the biasing force of the compression spring 11 and contracts the bellows 9, so that the valve body 10 opens the valve port 8. Then, the dirty water in the washing tub 2 flows through the drain port 2a, the communication pipe 5,
An inlet body 4b and an outlet body 4c of the valve case 4,
It is discharged through the drain pipe 6 and the drain hose 7 in this order. During the process of opening the valve port 8, at the beginning of the upward movement of the plunger 17, the valve stem 19 inside the bellows 9
Since the bellows 9 is communicated with the outside of the valve case 4 through the air flow passage 20 formed in the bellows 9, the air inside the bellows 9 escapes from the air flow passage 20, and the plunger 17 moves upward smoothly. And the suction part 1 of the plunger 17
7a collides with the iron core 15, that is, when the valve body 10 has moved by a distance L ₂ , the lower end surface 20a of the airflow passage 20 enters into the insertion tube portion 4a, so that the solid line in FIG. As shown in the air flow passage 20
is substantially closed, and the interior of the bellows 9 is brought into a closed state to such an extent that the internal air can escape through the slight clearance created by the fitting margin between the valve stem 19 and the insertion cylinder portion 4a. As a result, the air inside the bellows 9 is compressed thereafter, and acts as an air damper to prevent the tendency of the bellows 9 to contract, thereby slowing down the moving speed of the plunger 17. As a result, plunger 17
is in gentle contact with the iron core 15 at low speed and the plunger 17
direct collision with the iron core 15 can be alleviated.

Furthermore, when the electromagnet 12 is de-energized, the plunger 17 descends due to its own weight and the urging force of the compression spring 11. As the bellows 9 is expanded accordingly, the inside of the bellows 9 becomes negative pressure at the initial stage of the power outage when the airflow passage 20 is almost closed, but the outside air flows between the insertion opening 4a and the valve stem 19. Since the plunger 17 enters the bellows 9 through the small gap that exists, the plunger 17 continues to descend, although the descending speed slows down. After this, when the entire air flow passage 20 penetrates through the insertion cylinder portion 4a, the inside of the bellows 9 becomes the air flow passage 2.
0 to the outside of the valve case 4, the plunger 17 rapidly descends and the valve port 8 is closed by the valve body 10.

In this way, in the above embodiment, just before the plunger 17 collides with the iron core 15, the bellows 9, so to speak,
Since the moving speed of the plunger 17 can be slowed down by the damper effect, the generation of noise caused by the collision of the plunger 17 with the iron core 15 can be suppressed.
Further, as the collision force between the plunger 17 and the iron core 15 is reduced, damage to the iron core 15 caused by the plunger 17 can be reduced. Furthermore, the damper effect is caused by the suction part 17a of the plunger 17 when the valve port 8 is opened.
This occurs only immediately before colliding with the iron core 15, and when the valve port 8 is closed, it occurs only immediately after the power is cut off, so the speed of opening and closing of the valve port 8 is not impaired, and The amount of load on the excitation coil 14 does not substantially increase, and there is no need to increase the ampere turns of the excitation coil 14. The airflow passage 20 is simply provided by cutting on the valve stem 19, and no new members are added, so that a simple configuration is sufficient.

Next, FIGS. 4 and 5 show a second embodiment of the present invention, in which the same parts as the first embodiment are denoted by the same reference numerals.
This will be explained based on the diagram. The difference between the second embodiment and the first embodiment is that in the second embodiment, an auxiliary passage portion 21 is provided in the valve stem 19 from the air flow passage 20 toward the inside of the valve case 4, and this passage is cut off. The area is set to be smaller than that of the airflow passage 20, and the entire area is formed in two stages. With this configuration, in addition to obtaining the same effects as in the first embodiment, it is possible to avoid an excessive damping effect due to the bellows 9 when the plunger 17 contacts the iron core 15, and at the same time, it is possible to avoid the excessive damping effect caused by the bellows 9 when the plunger 17 contacts the iron core 15. 1
7 in the valve closing direction can be performed more quickly.

Next, a third embodiment of the present invention will be described based on FIG. 6, in which the same parts as in the first embodiment are denoted by the same reference numerals. The third embodiment differs from the first embodiment in that an air inflow hole 22 is formed in the valve case 4 to communicate the inside and outside of the bellows 9, and a check is provided to open and close the air inflow hole 22 inside the valve case 4. The valve 23 is provided so that the air inflow hole 22 is closed by the check valve 23 only when the bellows 9 is contracted. With this configuration, in addition to the effects of the first embodiment, when the electromagnet 12 is cut off, the air circulation hole 2
Since the bellows 9 is easily expanded by opening 2, the closing operation of the valve body 10 becomes quick.

Although each of the embodiments described above is applied to a two-tub type washing machine, it goes without saying that the invention can be widely applied to other devices, and may be modified as appropriate without departing from the scope of the invention.

As explained above, the present invention is capable of suppressing noise generation and damage to stationary parts such as the iron core caused by collisions of the plunger against stationary parts such as the iron core due to the energization of the electromagnet with a simple configuration, and the opening/closing operation of the fluid passage. Therefore, it is possible to provide a solenoid valve device that does not impair the speed of operation and also does not cause an increase in ampere turns of the electromagnet.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a cutaway side view of a two-tub washing machine, FIG. 2 is an enlarged vertical sectional view of the valve device, and FIG. 3 is a valve stem. FIG. 4 and FIG. 5 show a second embodiment of the present invention, FIG. 4 is an enlarged longitudinal cross-sectional view of the main part, and FIG.
The figure is a view corresponding to FIG. 3, and FIG. 6 is an enlarged longitudinal cross-sectional view of the main part showing a third embodiment of the present invention. In the figure, 4 is a valve case, 4a is an insertion cylinder (insertion port), 8 is a valve port (fluid passage), 9 is a bellows, 10
1 is a valve body, 12 is an electromagnet, 15 is an iron core, 17 is a plunger, 19 is a valve stem, 20 is an air flow passage, 21 is an auxiliary passage, 22 is an air inflow hole, and 23 is a check valve.

Claims (1)

[Claims] 1. A valve case having a valve body that opens and closes a fluid passage, a valve rod that is slidably inserted into an insertion opening formed in the valve case, is connected to the valve body, and is driven by an electromagnet, and the insertion opening is a bellows that surrounds and includes the valve stem in the valve case; A solenoid valve device comprising an air flow passage that communicates with the outside of the valve case via an insertion opening and is then closed.