JPH06323448A - Water feed valve - Google Patents

Abstract

PURPOSE:To secure a required passage and increase discharge even if a pressure on the inflow side is low by composing a diaphragm so as to be separated from the discharge aperture of a water feed valve by means of a plunger soon after the plunger is separated from the center pore of the diaphragm by electromagnetic force. CONSTITUTION:Water flowing in from the inflow aperture 1 (a) of a valve case 1 passes through the side hole 2 (b) of a diaphragm 2, the side pore 3 (b) of a valve core 3 and the side hole of patch 5 by turns and flows in a chamber so as to fill the chamber. Thereby, since the seat surface of the diaphragm 2 is pressed to a sitting surface 1 (c) of the valve case 1 gaps between them are sealed. In this case, if a voltage is applied to an electromagnetic coil 10, a plunger 4 is sucked to the electromagnetic coil 10 side against a pushing spring 8. Then moving amount of the plunger 4 is transmitted to a diaphragm 2 by way of engagement of an projection of the patch 5 and the cutout hole of the valve core 3. That is, opening size between the seat surface and sitting surface may depend on the stroke of the plunger 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply valve used in a fully automatic washing machine or the like, and more particularly to a structure of the water supply valve characterized by increasing the flow rate of water in a region where the tap water pressure is low.

[0002]

2. Description of the Related Art A water supply valve used in a fully automatic washing machine or the like is proposed in, for example, Japanese Patent Publication No. 55-17872. This example relates to reduction of noise level of a water supply valve equipped with a constant flow rate device for ensuring a constant flow rate in a water pressure range of 1 to 8 kg / cm ² , as disclosed in Japanese Utility Model Publication No. 44-27344. It relates to an improvement of the proposed constant flow device.

As shown in FIG. 5 of Japanese Utility Model Publication No. 44-27344, the flow rate is small in the low pressure range. Further, as described in Japanese Patent Publication No. 55-17872, the noise level becomes high when the pressure becomes medium to high, so it is considered that the flow rate and the noise level are proportional to each other. Therefore, the noise level in FIG. 12 of Japanese Examined Patent Publication No. 55-17872 can be replaced with the flow rate, but the flow rate is low in the low water pressure range.

The cause of the small flow rate in the low water pressure range is
This is because it is not enough to separate the diaphragm from the discharge port by water pressure.

At the time of anhydrous pressure, the diaphragm has an arbitrary pressing force against the discharge port due to the rigidity of the diaphragm itself so as to improve the water sealing property. For this reason, at low water pressure, it becomes insufficient to separate the diaphragm from the discharge port against the pressing force, it becomes difficult to secure the flow path, and the fluid resistance increases, resulting in a decrease in the flow rate. The decrease in the flow rate lengthens the time required to supply the required amount of water into the washing tub, resulting in a longer washing time.

[0006]

SUMMARY OF THE INVENTION In the present invention, it is proposed to dramatically increase the flow rate even at a low water pressure to shorten the washing time.

[0007]

[Means for Solving the Problems] Between the plunger and the diaphragm, the diaphragm is interlocked with the movement of the plunger which is attracted by electromagnetic force to open the central small hole of the diaphragm or which is blocked by the extension force of the push spring. The object of the present invention can be achieved by providing a connecting portion in the.

[0008]

In the past, the electromagnetic force was used only to attract the plunger and open the central small hole of the diaphragm. However, as described above, by providing the connecting portion between the plunger and the diaphragm, the plunger discharges. When moving in the direction away from the outlet, the diaphragm is pulled in the direction away from the discharge port, so that the flow passage can be secured, and the fluid resistance can be reduced, so that the flow rate can be increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

A valve case 1 has an inflow port 1a and a discharge port 1b, and a diaphragm 2 is provided at the top of the discharge port 1b.
There is provided a seating surface 1c for receiving. A seal surface 1d is arranged concentrically with the seating surface 1c, and a mounting surface 1e for screwing and fixing the yoke 9 is provided further outside thereof. The screws are not shown in this figure. In addition, the inlet 1a
A water supply valve of this kind is generally equipped with a constant flow rate device, but it is not shown in this figure.

The diaphragm 2 is provided with a seat surface 2a and an elastic hole 2e for elastically adhering to the valve core 3 at the center thereof, and a flexible portion 2d is arranged concentrically with the seat surface 2a and further outside thereof. Is provided with a seal ring portion 2c. A side hole 2b is provided on the side of the seat surface 2a.

A central small hole 3a is formed at the center of the valve core 3, and a constricted portion 3 for elastically attaching to the diaphragm 2 is formed on the outer periphery thereof.
f is arranged. A lateral small hole 3b is provided on the lateral side of the valve core 3. The lateral small hole 3b has a smaller diameter than the central small hole 3a. The rising portion 3c is provided on the outermost periphery, and the rising portion 3c
A plurality of cutout holes 3e are provided in the. A guide blade 3d is provided on the opposite side of the rising portion 3c to prevent the valve core 3 from being largely inclined with respect to the seat surface 2a by being guided by the inner wall of the discharge port 1b.

A plunger 4 has small diameter portions 4a and 4d on the valve core 3 side, and a locking ring portion 4b formed between the small diameter portions 4a and 4d. For this purpose, a middle diameter portion 4c having a larger diameter than the small diameter portion 4a is provided.
The tip 6 is usually made of an elastic material such as rubber, is formed in a bag shape, and is elastically attached so as to wrap around the middle diameter portion 4c.

Reference numeral 5 is a backing plate, and a locking hole 5c having a diameter smaller than that of the locking ring portion 4b is provided in the center thereof, and the periphery thereof is surrounded by a push-out portion 5a which is raised. The outer diameter of the tip 6 and the locking ring portion 4b are provided outside the pushing portion 5a.
A water passage hole 5b having a larger diameter is provided. The water passage hole 5b and the locking hole 5c are connected by a slit 5d having a width larger than the diameter of the small diameter portion 4a. In addition, a side hole 5e, which is sufficiently larger than the side small hole 3b and has the same diameter as the side hole 2b, is arranged on the side. A plurality of protrusions 5f are provided on the outermost circumference. The outer diameter of the protrusion 5f is slightly larger than the inner diameter of the rising portion 3c, and the width thereof is smaller than the width of the cutout hole 3e. Moreover, the number and the position thereof are made to coincide with the cutout holes 3e.

A plunger guide 7 is composed of a small-diameter cylindrical portion and a large-diameter cylindrical portion, and the top of the small-diameter cylindrical portion is closed, but the bottom of the large-diameter cylindrical portion is open.

A pressing spring 8 has one end in contact with the plunger guide 7 and the other end in contact with the plunger 4, and its extension force is a force for closing the tip 6 with the central small hole 3a of the valve core 3 through the plunger 4. Acts as.

Reference numeral 9 denotes a yoke, which together with the auxiliary yoke 11 serves as a magnetic path of magnetic flux generated in the electromagnetic coil 10.

A perspective view of these essential parts is shown in FIG.

The essential parts of the present invention are assembled as follows. The plunger 4 to which the tip 6 is attached is inserted through the water passage hole 5b of the contact plate 5, and the small diameter portion 4a is moved along the slit 5d so as to be aligned with the locking hole 5c. After that, the side hole 5e
The side small holes 3b are aligned with each other, and the backing plate 5 is pressed from above the rising portion 3c to slightly raise the rising portion 3c.
Is deformed and the projection 5f is elastically mounted in the cutout hole 3e.

When assembling the diaphragm 2 and the valve core 3, the side small holes 3b and the side holes 2b are aligned with each other, and the elastic holes 2e are slightly deformed and elastically attached to the constricted portion 3f.

When the yoke 9 is screwed onto the mounting surface 1e, the seal ring portion 2c is pressed against the seal surface 1d by the bottom of the large diameter cylindrical portion of the plunger guide 7 to connect the inflow port 1a and the discharge port 1b. The partition will form an additional chamber therebetween.

In a state where all parts are assembled and no voltage is applied to the electromagnetic coil 10, the tip 6 closes the central small hole 3a, and the upper surface of the engaging ring portion 4b and the lower surface of the pushing portion 5a are minute. The gap G occurs as shown in FIG. The seat surface 2a of the diaphragm 2 is pressed against the seating surface 1c by the rigidity of the flexible portion 2d.

In this state, when water flows in through the inflow port 1a, the water passes through the side holes 2b, the side small holes 3b, and the side holes 5e to flow into and fill the chamber, and the pressure causes the seat surface 2a to be seated. It is strongly pressed against 1c. Therefore, the sealing property between the seat surface 2a and the seating surface 1c is further improved. This state is shown in FIG. 1, and an enlargement of the main part is shown in FIG.

When a voltage is applied to the electromagnetic coil 10 from this state, the plunger 4 is pulled toward the electromagnetic coil 10 side against the extension force of the push spring 8. At the same time, the tip 6 opens the central small hole 3a of the valve core 3, and the upper surface of the locking ring portion 4b abuts the lower surface of the pushing portion 5a. As a result, the small gap G
Occurs on the lower surface of the chip 6 and the upper surface of the central small hole 3a. On the other hand, the water that has flowed into and filled the chamber flows out from the central small hole 3a via the water passage hole 5b, and decompresses the inside of the chamber. When the pressure in the chamber becomes lower than that on the inlet 1a side, the seat surface 2a of the diaphragm 2 separates from the seating surface 1c, and water flows directly from the inlet 1a to the outlet 1b. This state is shown in FIG. 2, and an enlargement of the main part is shown in FIG.

Conventionally, when the pressure on the inlet 1a side was low, the seat surface 2a could not be pushed up sufficiently, so the gap with the seating surface 1c was small and the fluid resistance increased. In the present invention, the plunger 4 is further moved to the electromagnetic coil 10 even after the upper surface of the locking ring portion 4b and the lower surface of the pushing portion 5a are brought into contact with each other.
Since it is pulled to the side, the movement amount of the plunger 4 is transmitted to the diaphragm 2 through the engagement between the projection 5f and the cutout hole 3e. Therefore, the opening dimensions of the seat surface 2a and the seating surface 1c depend on the stroke of the plunger 4.

[0026]

According to the present invention, the discharge amount can be greatly improved even when the pressure on the inflow side is low. As a result, the washing time can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a water supply valve of the present invention when no voltage is applied.

FIG. 2 is a vertical cross-sectional view of the water supply valve of the present invention when a voltage is applied.

FIG. 3 is a perspective view of essential parts of the water supply valve.

FIG. 4 is a vertical cross-sectional view of the main part of the water supply valve.

FIG. 5 is a vertical cross-sectional view of the main part of the water supply valve.

[Explanation of symbols]

1 ... Valve case, 2 ... Diaphragm, 3 ... Valve core, 4 ...
Plunger, 5 ... Contact plate, 6 ... Tip, 7 ... Plunger guide, 8 ... Push spring, 9 ... Yoke, 10 ... Electromagnetic coil, 11 ... Auxiliary yoke.

Claims (1)

[Claims] 1. A diaphragm having water or hot water inflow holes and discharge holes, and a small hole in the center and sideways between them is arranged so as to close the discharge holes, and the small holes are closed. In a water supply valve capable of separating a plunger and the plunger from a central small hole by an electromagnetic force, immediately after the plunger separates from the central small hole by an electromagnetic force, the plunger further separates the diaphragm from the discharge port. A water supply valve characterized by being configured as described above.