JP2003314717A - Fluid switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid switch wherein deterioration of water-tightness of a valve seat packing is restrained. <P>SOLUTION: The sheet shaped valve seat packing 23 is provided between an inner wall of a valve chamber 25 of a housing 21 and an outer peripheral surface of a rotary valve 22 so as to surround fluid outflow ports 28 and 29. A protruding part 45 protruding into the valve chamber 25 is provided on a periphery part of the fluid outflow ports 28 and 29 of the housing 21 in a height by which the protruding part 45 does not abut onto the rotary valve 22. The protruding part 45 abuts onto an end surface of a hole part formed on the valve seat packing 23, and thereby the valve seat packing 23 is prevented from being moved to the fluid outflow ports 28 and 29 by the pressure of the fluid. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid switching tool used for various fluid devices such as water purifiers, and more specifically to a fluid switching tool using a rotary valve as a flow path switching means.

[0002]

2. Description of the Related Art As an example of a fluid switching device using a rotary valve, there is a running water switching device disclosed in Japanese Utility Model Publication No. 6-3233.

As shown in FIG. 5, this running water switching device has a cylindrical valve chamber 1, a running water inlet 2 for allowing water to flow into the valve chamber 1, and a water flowing into the valve chamber 1. Housing 5 having a plurality of running water outlets 3 and 4 for flowing out to the outside
And a hollow cylindrical rotary valve 7 rotatably mounted in the valve chamber 1, and a thin thin valve that is disposed between the inner wall of the valve chamber 1 and the outer peripheral surface of the rotary valve 7 and surrounds the flowing water outlets 3 and 4. It is composed of a sheet-like sealing packing 9, 9.

This known running water switching device has a first opening 11 formed by penetrating the peripheral wall of the rotary valve 7.
To the running water inlet 2 and the rotary valve 7 is rotated so that the second opening 12 formed by penetrating the peripheral wall of the rotary valve 7 is fitted to the running water outlet 3 or 4. It has the advantages that it can be switched, the number of parts and the number of assembling work steps are small, and that the water passage is simple, so that the sealability is excellent and that a water hammer hardly occurs.

[0005]

However, in the above-described conventional running water switching tool, the sealing packing 9 is in the form of a thin sheet. Therefore, when the water pressure in the valve chamber 1 becomes high, the flow path is closed. There is a problem that the seal packing surrounding the running water outlet on one side is pushed to the running water outlet side without being able to withstand the water pressure and deforms, and it becomes impossible to maintain the closed state of the flow path, causing water leakage. there were. And the problem is that the larger the diameters of the outlets 3 and 4,
Also, the higher the water pressure, the greater the danger that will occur.

Further, in the above-described conventional running water switching tool, the sealing packing 9 is adhered and fixed to the inner wall of the valve chamber 1.
There is also a problem in that it takes a lot of man-hours to attach the packing 9 and an operation error is likely to occur.

Further, since the contact area between the inner wall of the valve chamber 1 and the outer peripheral surface of the rotary valve 7 is large, not only the rotary torque of the rotary valve 7 becomes large, but also the rotary shake of the rotary valve 7 may occur. Therefore, there is a problem that poor contact occurs between the rotary valve 7 and the sealing packing 9 and the watertightness is lowered, and the sealing packing 9 itself is damaged.

The present invention solves the above-mentioned problems of the conventional flow switching device, that is, the watertightness is not lowered, the packing is less damaged, and the packing is easily attached, and the rotary valve is used. It is an object of the present invention to provide a fluid switching tool having a small torque.

[0009]

The fluid switching device of the present invention comprises:
A housing having a cylindrical valve chamber, a fluid inlet for allowing a fluid to flow into the valve chamber, and a plurality of fluid outlets for causing the fluid that has flowed into the valve chamber to flow outside, a hollow cylinder A first through hole having a shape for allowing a fluid flowing in from a fluid inlet of the housing to flow into the inside; and a fluid flowing into the inside of the housing to flow out of the housing via the fluid outlet. A rotary valve having a second through hole formed in the peripheral wall and rotatably mounted in the valve chamber, and the rotary valve is rotated so that the rotary valve is installed in any one of the plurality of fluid outlets. In a fluid switching tool that switches a fluid flow path by aligning a second through hole, a sheet-like valve that surrounds a periphery of the fluid outlet between an inner wall of the valve chamber and an outer peripheral surface of the rotary valve. Seat packing provided A convex portion is provided in a peripheral portion of the fluid outlet of the housing toward the valve chamber so as not to hinder the rotation of the rotary valve, and the valve seat packing is provided corresponding to the fluid outlet. The valve seat packing is prevented from moving toward the fluid outflow port by contacting the end face of the hole formed in the.

According to this structure, the pressure of the fluid in the valve chamber becomes high, and the fluid is pushed toward the fluid outlet side with respect to the valve seat packing surrounding the fluid outlet on the side where the flow passage is closed. Even if a large pressure is applied, the movement of the valve seat packing toward the fluid outlet side is prevented by the contact of the convex portion with the end surface of the hole formed in the valve seat packing,
The valve seat packing is not pushed out to the fluid outlet,
The valve seat packing will not be deformed.

The valve seat packing preferably has a plurality of holes corresponding to a plurality of fluid outlets. With such a configuration, the periphery of the plurality of fluid outlets can be surrounded only by attaching one sheet of valve seat packing to the valve chamber.

A groove portion is provided on a surface of the valve seat packing facing the inner wall of the valve chamber, and both ends of the valve seat packing are inserted into the inner wall portion of the valve chamber to which the valve seat packing is attached. Providing a groove and a protrusion that fits into the groove, insert both ends of the valve seat packing into the pair of grooves,
If the valve seat packing is attached to the inner wall of the valve chamber by fitting the groove into the protrusion, it is not necessary to attach the valve seat packing by adhesion.

A protrusion is provided on the inner wall of the valve chamber so as to contact the outer peripheral surface of the rotary valve in a direction parallel to the rotation center axis of the rotary valve, and the rotary valve is provided with the protrusion and the valve seat packing. It is advisable to adopt a configuration in which it is rotatably supported by. With such a configuration, the contact area between the valve chamber and the rotary valve is reduced, so that the rotary torque of the rotary valve is reduced.

Further, the hole formed in the valve seat packing so as to correspond to the fluid outlet is formed into an elliptical shape in a flat state of the valve seat packing. The ratio of the diameters may be determined so that the shape in which the hole is projected onto a plane is a perfect circle when the valve seat packing is bent to have a predetermined curvature along the inner wall of the valve chamber. If the shape of the hole formed in the valve seat packing is such an elliptical shape, the inner wall of the valve chamber will be formed in a state where the hole is exactly aligned with the fluid outlet that is generally formed in a perfect circle. A valve seat packing can be attached.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a fluid switching tool according to the present invention will be described in detail with reference to FIGS. In the drawings, FIG. 1 is a front sectional view of an embodiment of the present invention, and FIG. 2 is a front sectional view showing the housing of FIG.
FIG. 3 is an enlarged view of part A of FIG. 1, and FIG. 4 is a radial view of the valve seat packing of the fluid switching tool according to FIG.

As shown in FIG. 1, the fluid switching tool according to the present invention comprises a housing 21, a rotary valve 22, and a valve seat packing 23. The housing 21 is shown in FIG.
As shown in FIG. 2, a cylindrical valve chamber 25 in which the rotary valve 22 is mounted, a fluid inlet 27 for allowing a fluid such as water to flow into the valve chamber 25, and a fluid flowing into the valve chamber 25 to the outside. Two fluid outlets 28 and 29 are formed for the outflow. A faucet or the like is connected to the fluid inlet 27.

The rotary valve 22 has a hollow cylindrical shape and is rotatably mounted in the valve chamber 25. The peripheral wall 31 of the rotary valve 22 has a first through hole 33 for allowing the fluid flowing from the fluid inlet port 27 of the housing 21 to flow into the inside, and the fluid flowing into the rotary valve 22 to the fluid flow of the housing 21. A second through hole 34 is formed in the peripheral wall so as to flow out of the housing 21 through the outlet 28 (29).

By rotating this rotary valve 22 and aligning the through hole 33 with the fluid inlet 27 and the through hole 34 with the fluid outlet 29, as shown in FIG. 1, the fluid inlet 27 and the rotary valve are aligned. 22 and a fluid flow outlet 29 are formed. Further, the rotary valve 22 is rotated to align the through hole 33 with the fluid inlet 27, and the through hole 34
To the fluid outlet 28,
7, the rotary valve 22, and the fluid outlet 28 can be switched to another fluid flow path.

The valve seat packing 23, as shown in FIG.
The inner wall 25a of the valve chamber 25 and the outer peripheral surface 31 of the rotary valve 22
It has a thin plate shape that can be placed between a and a, and is made of an elastic material such as rubber or synthetic resin. As shown in FIG. 4, the valve seat packing 23 is formed in a rectangular shape, and the two hole portions 4 corresponding to the fluid outlets 28, 29 are provided so as to surround the fluid outlets 28, 29.
1, 42 are drilled.

The holes 41 and 42 are formed in the valve seat packing 23.
Is flat, the valve seat packing 23 is formed in an elliptical shape with the major axis X in the longitudinal direction and the minor axis Y in the direction orthogonal to the longitudinal direction. The diameters of the fluid outlets 28 and 29 are the same. The ratio of the major axis X and the minor axis Y of this elliptical shape is such that the valve seat packing 23 is
The shape in which the holes 41 and 42 are projected on a plane is determined to be a perfect circle in a state of being bent to have a predetermined curvature along the inner wall of No. 5. If the shape of the holes 41, 42 is such an elliptical shape, the holes 41, 42 of the valve chamber 25 are exactly aligned with the fluid outlets 28, 29 having a circular cross section. The valve seat packing 23 can be attached to the inner wall 25a.

Further, the valve seat packing 23 has holes 41, 4 and 4.
Peripheral edge portions 41a and 42a, a portion 23a between the hole portions 41 and 42, and long side edge portions 23b and 23 of the valve seat packing 23.
c is projected. In this way, the peripheral portion 41a,
42a, the portion 23a, and the long side edges 23b and 23c are projected, so that the valve seat packing 2
3 is reliably contacted with the outer peripheral surface 31a of the rotary valve 22, and the water tightness of the fluid outlets 28, 29 is improved.

Further, both ends 23f, 2 of the valve seat packing 23 are
As shown in FIG. 2, 3g is formed thinner than the plate thickness of the valve seat packing 23, and further on the back surface of the valve seat packing 23 corresponding to the portion 23a (the surface facing the inner wall 25a of the valve chamber 25). Has a single groove 23k.

On the other hand, the inner wall 25a of the valve chamber 25 is formed with a pair of grooves 25c and 25d for inserting both ends 23f and 23g of the valve seat packing 23, and a projection 25g into which the groove 23k is fitted. There is. Therefore, the valve seat packing 23
Can be attached and fixed to the inner wall 25a of the valve chamber 25 by inserting both ends 23f and 23g into the pair of grooves 25c and 25d and fitting the groove 23k to the protrusion 25g.

In addition, the fluid switching tool according to the present invention is shown in FIG.
Fluid outlets 28, 29 of the housing 21, as shown in FIG.
A convex portion 45 is provided on the peripheral portion of the valve chamber 25 toward the inside of the valve chamber 25. In this example, the protruding portions 45 are formed by projecting the ends of the tubular bodies 47, 48 forming the fluid outlets 28, 29 beyond the inner wall 25a. To prevent the convex portion 45 from interfering with the rotation of the rotary valve 22, specifically, the peripheral edge portions 41 a and 4 of the valve seat packing 23.
It is lower than the height of 2a. Therefore, this convex portion 4
5 does not interfere with the rotary valve 22.

By forming the protrusions 45 on the peripheral portions of the fluid outlets 28, 29 in this way, the pressure of the fluid in the valve chamber 25 becomes high, and the fluid flow on the side where the flow path is closed is formed. Even if a large pressure that pushes toward the fluid outlet side acts on the valve seat packing 23 that surrounds the outlet (the fluid outlet 28 in FIG. 1), the valve seat packing 25 moves toward the fluid outlet side with a hole. Since the convex portion 45 comes into contact with the end surface 49 of 41 (42) to prevent it, the valve seat packing 23 is not pushed out to the fluid outlet, and the valve seat packing 23 is not deformed.

As shown in FIG. 1, a protrusion 50 is provided on the inner wall 25a of the valve chamber 25, and the protrusion 50 extends in a direction parallel to the rotation center axis of the rotary valve 22. By providing the ridge 50 in this manner, the rotary valve 22 is provided with the ridge 50 and the peripheral edge portion 41 of the valve seat packing 23.
a, 42a, portion 23a and long side edge portions 23b, 23c
By this, it is in a state of being rotatably supported. Therefore, the contact area between the inner surface of the valve chamber 25 and the outer surface of the rotary valve 22 is small, and further, the contact area with the valve chamber 25 is small,
The rotary valve 22 can be easily mounted in the valve chamber 25.

[0027]

As described above, in the fluid switching device of the present invention, the convex portion abuts on the end face of the hole formed in the valve seat packing so that the valve seat packing faces the fluid outlet. Since it is configured to prevent movement, the pressure of the fluid in the valve chamber increases, and the fluid outlet side is closer to the valve seat packing that surrounds the fluid outlet on the side where the flow path is closed. Even if a large pressure is applied to the valve seat packing, the movement of the valve seat packing toward the fluid outlet side is blocked by the projections coming into contact with the end faces of the hole of the valve seat packing. The valve seat packing is not deformed. Therefore, stable fluid sealing can be performed by the valve seat packing.

Further, by forming a plurality of holes corresponding to the plurality of fluid outlets in the valve seat packing, the periphery of the plurality of fluid outlets can be surrounded only by mounting one valve seat packing in the valve chamber. Further, a groove portion is provided in the valve seat packing, and a pair of grooves into which both ends of the valve seat packing are inserted, and a protrusion fitting with the groove portion are provided on the inner wall of the valve chamber, and both ends of the valve seat packing are provided. Is inserted into the pair of grooves, and the groove is fitted to the protrusion to attach the valve seat packing to the inner wall of the valve chamber, so that it is not necessary to attach the valve seat packing by adhesion. Not only can the number of steps for attaching the seat packing be reduced, but the valve seat packing can be attached accurately at a predetermined position in the valve chamber.

Further, since the rotary valve is rotatably supported by the protrusion and the valve seat packing provided on the inner wall of the valve chamber, the contact area between the valve chamber and the rotary valve becomes small, so that the rotary valve The rotation torque of the rotary valve becomes small, and the rotary shake does not occur in the rotary valve.

Further, the shape of the hole formed in the valve seat packing is formed into an elliptical shape in the flat state of the valve seat packing, and the ratio of the major axis to the minor axis of the elliptical shape is defined by the valve seat packing. In the state of being bent to a predetermined curvature along the inner wall of the valve chamber, it was determined that the shape of the hole projected on a flat surface was a perfect circle, and therefore the fluid outlet having a perfect cross section was formed. On the other hand, the valve seat packing can be attached to the inner wall of the valve chamber with the holes accurately aligned.

[Brief description of drawings]

FIG. 1 is a front sectional view of a fluid switching tool according to an embodiment of the present invention.

FIG. 2 is a front sectional view showing a housing of the fluid switching device according to FIG.

FIG. 3 is an enlarged view of a portion A of FIG.

4 is a plan view of a valve seat packing of the fluid switching tool according to FIG. 1. FIG.

FIG. 5 is a diagram illustrating a conventional running water switching tool.

[Explanation of symbols]

21 housing 22 Rotary valve 23 valve seat packing 25 valve chamber 27 Fluid inlet 28, 29 Fluid outlet 33 First through hole 34 Second through hole 41, 42 Hole of valve seat packing 45 convex 49 Edge

Continued front page    F term (reference) 3H067 AA12 AA23 CC02 CC22 CC33                       CC34 DD03 EA02 EB11 FF11                       FF17 GG01 GG21

Claims (5)

[Claims] 1. A housing having a cylindrical valve chamber, a fluid inlet for allowing a fluid to flow into the valve chamber, and a plurality of fluid outlets for allowing the fluid that has flowed into the valve chamber to flow out. A first through hole having a hollow cylindrical shape for allowing a fluid flowing from a fluid inlet of the housing to flow into the housing; and a fluid flowing into the housing through the fluid outlet to the housing. A rotary valve having at least one second through hole formed in the peripheral wall for flowing out to the outside of the valve. The rotary valve is rotatably mounted in the valve chamber. Any one of the fluid outlets
A fluid switching tool for switching the flow path of a fluid by matching the second through hole to a sheet, the sheet surrounding the fluid outlet between the inner wall of the valve chamber and the outer peripheral surface of the rotary valve. -Shaped valve seat packing is provided, and a convex portion is provided in the peripheral portion of the fluid outlet of the housing toward the valve chamber so as not to hinder the rotation of the rotary valve. Corresponding to the above, the convex portion comes into contact with the end surface of the hole formed in the valve seat packing to prevent the valve seat packing from moving toward the fluid outlet. A fluid switching tool. 2. The fluid switching tool according to claim 1, wherein the valve seat packing is formed with a plurality of holes corresponding to the plurality of fluid outlets. 3. A groove portion is provided on a surface of the valve seat packing facing the inner wall of the valve chamber, and both ends of the valve seat packing are inserted into an inner wall portion of the valve chamber to which the valve seat packing is attached. A pair of grooves and a protrusion that fits into the groove are provided, and the valve seat packing has both ends inserted into the pair of grooves, and the groove fits into the protrusion and is attached to the inner wall of the valve chamber. The fluid switching device according to claim 1, wherein the fluid switching device is provided. 4. An inner wall of the valve chamber is provided with a ridge that contacts an outer peripheral surface of the rotary valve in a direction parallel to a rotation center axis of the rotary valve, and the rotary valve has the ridge and the valve. The fluid switching tool according to any one of claims 1 to 3, which is rotatably supported by a seat packing. 5. The shape of the hole formed in the valve seat packing so as to correspond to the fluid outlet is an elliptical shape when the valve seat packing is flat. And the ratio of the minor axis is determined so that the shape in which the hole is projected on a plane is a perfect circle in a state where the valve seat packing is bent to a predetermined curvature along the inner wall of the valve chamber. The fluid switching tool according to any one of claims 1 to 4, wherein: