JP2514157Y2 - Switching valve self-closing prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a self-closing prevention mechanism for a switching valve.

(B) Conventional technology Conventionally, as seen in Japanese Utility Model Application Laid-Open No. 54-48432, one primary side flow path is provided in a valve casing through two valve seat holes facing each other and two secondary sides. A valve chamber that communicates with the flow path is formed, and an operating shaft equipped with an operating means is inserted from the outside of the valve casing coaxially with the central axis of the valve seat hole. A valve element is slidably mounted to correspond to the valve seat hole, a spring is interposed between the two valve elements, and each valve element is biased in the valve seat hole direction. There is a switching valve configured to open one of the valve seat holes by advancing and retracting the operating shaft.

Such a switching valve is capable of communicating the temporary side flow passage with either one of the two secondary side flow passages or by closing both by operating one operation shaft to move back and forth. It has the advantages of a compact outer shape and simple operation.

(C) Problem to be solved by the invention However, when the operation shaft is moved forward and backward by screwing to open the valve seat hole on one side, the valve body whose rotation is open due to frictional force It is transmitted to the spring through. However, since the other valve body is in close contact with the valve seat hole, the stress that tries to screw the operating shaft in the direction opposite to the above remains in the spring, and when the handle is released, the valve body once opened Will be moved in the closing direction.

In this way, when the valve body once opened moves in the valve closing direction by the return of the spring against the user's intention, it is difficult to adjust the valve opening amount, that is, the flow rate, and further, the valve body return amount Since it depends on the frictional force, it is unstable, and there is a drawback that flow rate adjustment becomes more difficult.

(C) Means for Solving the Problems In the present invention, a valve chamber in which one primary-side flow passage is connected to two secondary-side flow passages through two opposing valve seat holes in the valve housing. The operation shaft that moves forward and backward by screwing is inserted coaxially with the central axis of the valve seat hole from the outside of the valve housing, and the two valve elements can slide freely while maintaining a space on the operation shaft. The valve seats corresponding to the valve seat holes, and a spring is interposed between the two valve bodies to keep the valve closed, and each valve body is biased toward the valve seat hole. Then, in the switching valve configured to open one of the valve seat holes by the forward / backward movement of the operation shaft, between the spring and at least one of the valve bodies,
The present invention provides a self-closing prevention mechanism for a switching valve, characterized in that a slip ring formed of a low friction material is interposed.

(D) Action / Effect According to the present invention, the slip ring formed of a low friction material is interposed between each valve body and the spring, so that the space between the valve body and the slip ring and between the spring and Since the rotation of the operating shaft is not transmitted to the spring due to slipping with the slip ring and the returning force does not act on the operating shaft, the valve body is prevented from returning and the once opened valve body position is maintained. Therefore, the flow rate can be easily adjusted.

(E) Embodiment An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of the switching valve (A) taken along a plane including the axial center line of the valve, in which one primary-side flow path (2) is provided in a substantially central portion inside the valve casing (1). , Valve seat holes (3) and (4) are provided at opposite ends of the same side flow path (2) so as to face each other to form a valve chamber (5). The secondary side flow paths (6) and (7) are in communication with each other.

In addition, one valve seat hole (4) is inserted from the outside of the valve casing (1) into the valve chamber (5) so as to be coaxial with the central axis of each valve seat hole (3) (4). 8) is inserted.

The operating shaft (8) consists of the operating shaft body (8a) and the valve guide (8
b).

The operation shaft main body (8a) has a handle (9) continuously provided at one end, and a male screw (10a) is formed on the outer peripheral surface of the other end, so that the valve casing (1)
The operation shaft main body (8a) can be advanced and retracted by screwing into a female screw (10b) formed on the inner peripheral surface at one end thereof and rotating the handle (9).

In addition, attach the valve guide (8
By screwing b), the inner end of the main body (8a) and the head of the valve guide (8b) form the locking portions (15) and (16), respectively. (15) (16)
A small-diameter portion (14) having a predetermined length is formed between them to form an integral operation shaft (8).

In the small diameter portion (14), inside the valve chamber (5),
The two valve bodies (11) (12) are axially slidably fitted on the valve seats (3) (4) while keeping a predetermined space therebetween. It corresponds to.

Then, a spring (13) is provided between each valve body (11) (12).
The valve seats (3), (4)
Urging in the direction, when the operating shaft (8) is in the neutral position,
The valve is kept closed.

Particularly in the present invention, substantially washer-shaped slip rings (17) (18) are interposed between both ends of the spring (13) and the valve bodies (11) (12).

The slip rings (17) (18) are made of synthetic resin having a low friction coefficient such as fluororesin and nylon.

Therefore, each valve body (11) (12) and spring (13)
A slip occurs between the valve body (11) (12) and the spring (13), and the rotational force is not transmitted.

The slip rings (17) and (18) are not limited to synthetic resins as long as they have a low friction coefficient, and sintered metal or the like can be used as a material.

The embodiment of the present invention is configured as described above, and when the handle (9) is rotated leftward to open the left valve seat hole (3), the operating shaft (8) is screwed. Then, the coaxial (8) is moved rightward along the axis.

When the operation shaft (8) moves in the axial direction, the left valve body (11) engaged with the locking portion (15) moves toward the inside of the valve chamber (5) and one valve seat hole ( 8) opens.

During the above-mentioned valve opening operation, the rotation of the operating shaft (8) is about to be transmitted to the opened valve body (11) via a frictional force, but the spring (13) and the valve body (11) Since a slip ring (17) having a low coefficient of friction is interposed between them, the valve body (11)
A slip occurs between the spring and the spring (13), and the rotational force from the spring (13) is not transmitted to the left valve body (11). Therefore, there is no return of the operating shaft (8) and the valve The body (11) will retain the valve open position as it was manipulated.

Further, since the slip ring (18) is also interposed between the valve body (12) on the right side and the spring (13), by any chance, the slip ring (18) and the valve body (11) on the left side are in one place. Spring (1
Even if 3) rotates, the right valve body (12) and spring (1
Slip occurs between 3), so spring (13)
Since the torque of the rotational force does not remain in the valve body, it is possible to prevent the return of the operation shaft (8) and the closing of the left valve body (11) by itself.

Next, the switching valve (A) according to the present invention is connected to the hot and cold water discharge part of the hot and cold water mixing tap (B), and the hot water coming out from the hot and cold water mixing tap (B) is connected to the shower (20) and the calan (21). An example of use in which any of the above can be switched will be described with reference to FIG.

As shown in the figure, the water pipe (22) and the hot water pipe (23) are joined together via the hot and cold water mixing valve (B), and the hot and cold water mixing valve (B) is joined.
The mixing ratio of hot and cold water is adjusted by a temperature adjusting means (not shown) such as a thermostat built in the device, and the mixed hot and cold water set by the temperature adjusting handle (24) is discharged.

When the switching valve (A) is continuously connected to the discharge port of the hot and cold water mixing valve (B) and the handle (9) is placed in the neutral position, both valve seat holes (3) and (4) are opened. (11) (12) is closed to stop water discharge, and when the handle (9) is rotated to the left, mixed hot and cold water from the discharge port of the hot and cold water mixing stopper (B) is discharged from the shower (20). , When it is rotated to the right, it is possible to discharge the mixed hot water from the calan (21).

As described above, in the switching valve (A) according to the present invention,
Since the return of the handle (9) and the valve bodies (11) (12) of the switching valve (A) is prevented, the discharge amount of the mixed hot water can be adjusted accurately and easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view including a self-closing prevention mechanism for a switching valve according to the present invention, and FIG. 2 is an explanatory view showing a usage example of the switching valve. (1): Valve housing (2): Primary side flow path (3) (4): Valve seat hole (6) (7): Secondary side flow path (5): Valve chamber (8): Operating shaft (11 ) (12): Valve body (13): Spring (17) (18): Slip ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Junichi Nakajima 2-1 Nakajima, 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture (56) References: 54-48432 (JP, U) Actually open 55-22535 (JP, U) Actually open 61-81408 (JP, U) Actually open 58-32002 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A primary side flow passage (2) in a valve casing (1).
To form a valve chamber (5) that communicates with the two secondary side flow paths (6) and (7) through two valve seat holes (3) and (4) that face each other, and is moved forward and backward by screwing. The operation shaft (8) is connected to the valve casing (1)
Inserted coaxially with the central axis of the valve seat holes (3) and (4) from the outside of the, and slidable between the two valve bodies (11) and (12) while maintaining a space on the same operation axis (8). Mounted on the valve seat holes (3) and (4) respectively, and fitted to the two valve bodies (11) (1).
A spring (13) is interposed between 2) to keep the valve closed, and each valve body (11) (12) is biased toward the valve seat holes (3) (4), In a switching valve configured to open one of the valve seat holes (3) and (4) by moving the operating shaft (8) forward and backward, at least one of the spring (13) and the valve body (11) (12) is Slip ring (1
7) A switching valve self-closing prevention mechanism characterized by interposing (18).