JPH0726622Y2 - Speed control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] This invention allows fluids flowing in one direction to freely flow through a fluid passage and shields the freely flowing portion for fluids flowing in the other direction. The present invention relates to a speed control valve that allows the speed to flow while controlling the speed in other parts.

[Conventional technology]

Some conventional speed control valves are shown in FIG. 8 (a). This is such that a cylindrical bush 2 is arranged inside the housing 1 to form a free passage 3 between the housing 1 and the bush 2, and a bush 2 inside the control passage 4
I have to. The non-return valve body 5 is provided in the outer peripheral groove 2a of the bush 2.
And the valve body 5 includes a tubular portion 5a which is externally fitted into the outer peripheral groove 2a, and an umbrella-shaped lip portion 5b which continuously extends outward from one end of the tubular portion 5a, The whole is made of rubber material. The lip portion 5b has an umbrella shape and its outer edge is in contact with the inner surface of the housing 1. The lip portion 5b allows a free flow flowing in the direction of arrow A through the free passage 3 in FIG. 8 (a), but prevents the flow in the opposite direction. I am doing it. The flow in the opposite direction is a control flow in the direction of arrow B, which passes through the inside of the bush 2, but the cross section of the passage is controlled by a needle (not shown) that is coaxial with the inside of the bush 2 and has a taper.

[Problems to be solved by the device]

However, according to the above-mentioned conventional technique, if the rubber material of the valve body 5 is hardened, the free flow A is impeded, and therefore it cannot be sufficiently hardened. Therefore, as shown in FIG. 8 (b), There is a problem that the valve body 5 is disengaged from the bush 2 by the free flow A, or as shown in FIG. 8C, the valve body 5 is displaced toward the wall surface side of the housing 1 to close the free passage 3. Further, according to the control flow B, FIG.
As shown in Fig. 5, the lip portion 5b is inverted to the downstream side with the inclination of the tubular portion 5a, and as a result, the fluid also flows from the outer circumference of the bush 2, so that the fluid cannot be controlled to the downstream side. There was also the problem of obstructing the flow of the free flow.

An object of this invention is to eliminate the above problems without hardening the valve body of the speed control valve and to ensure the smoothness of the free flow and the control flow.

[Means for Solving the Problems]

According to the invention, a rubber valve body having a tubular portion and a lip portion which continuously extends outward from one end of the tubular portion is attached to an outer peripheral groove of a bush which coaxially divides a fluid free passage and a control passage. In a combined speed control valve, a cylindrical ring portion externally fitted to the tubular portion of the valve body and an inner portion of the tubular portion of the valve body abutting on the end surface of the tubular portion on the free end side of the lip portion. A displacement prevention ring integrally provided with a facing flange is engaged with the tubular portion of the valve body.

[Action]

Since the tubular portion of the valve body is restrained by the shift prevention ring, the tubular portion is prevented from being deformed, so that there is no deviation or movement from the engagement position, and it is possible to prevent the lip portion from reversing. .

〔Example〕

FIG. 1 shows the speed control valve as a whole, in which a bush 2 is inserted in a hollow portion of a housing 1 in a watertight manner,
A needle 6 is also inserted in the bush 2 in a watertight manner. The needle 6 is screwed into the bush 2 at the central screw portion, and the push screw 7 is screwed into the needle 6 at the rear side of the bush 2, and the push screw 7 is caulked at the rear end portion of the housing 1.

An opening 8 is formed in the peripheral wall of the housing 1, and an opening 9 is formed in the tip of the housing 1. The openings 8 and 9 communicate with each other through the inside of the housing 1. Opening 8
A joint 11 is attached to the pipe, and the pipe body is connected through the joint 11.

The communication between the openings 8 and 9 will be specifically described. A free passage 3 passing outside the bush 2 in the housing 1 and a control passage 4 passing inside the bush 2 in the housing 1.
The openings 8 and 9 communicate with each other through and. Control passage 4
The needle 6 faces the valve 6, and the flow area is controlled by advancing and retracting the needle 6 in the axial direction, and the free passage 3 has a valve body 5 that engages with the groove 2a on the outer periphery of the bush 2.
The valve body 5 constitutes a check valve that allows only the fluid flowing from the opening 8 to the opening 9 to pass therethrough. With this configuration, the free flow A is from the opening 8 to the opening 9, and the control flow B is from the opening 9 to the opening 8.

The valve body 5 is made of a rubber material as a whole, and as shown in FIGS. 2 to 4, a tubular portion 5a, a lip portion 5b having an umbrella shape continuous from one end to the outside, and both 5a and 5b. It is composed of radial ribs 5c that connect the spaces. These are integrally molded. The valve body 5 is fitted onto the small diameter portion 2b formed by the groove 2a of the bush 2.

The small-diameter portion 2b of the bush 2 is a hollow tube which is separate from the other portions of the bush 2 and has an outward flange at the lower end. As shown in FIG.
It is screwed to the other part of. The reason why the bush 2 is composed of the two members that are screwed together is that it is necessary for the work of mounting the valve body 5 in the groove 2a using the shift stop ring 12 described later. Instead of screwing, both parts may be fixed by press fitting.

That is, the shift prevention ring 12 is engaged with the valve body 5, and the shift prevention ring 2 is fitted onto the tubular portion 5a of the valve body 5 as shown in FIGS. And the cylindrical ring portion 12a and the lip portion 5b of the tubular portion 5a of the valve body 5 arranged
It is integrally provided with an inward flange 12b arranged so as to be in contact with the end surface on the free end side, and the notch groove 12 for relatively inserting the rib 5c of the valve body 5 into the cylindrical ring portion 12a.
c is formed.

As shown in FIG. 6, the shift prevention ring 12 has a valve body 5
By externally fitting the tubular portion 5a, the tubular portion 5a is restrained.

Thus, depending on the free flow A passing through the free passage 3 in the housing 1, the lip portion 5b of the valve body 5 is deformed inward as shown by a chain line in FIG. On the other hand, when the flow is the control flow B, it is prevented from passing through the free passage 3, passes through the control passage 4, and flows out from the opening 8 as a flow controlled by the needle 6.

Here, even if the pressure due to the free flow A becomes large, the tubular portion 5a of the valve body 5 is restrained from being deformed because it is constrained by the displacement prevention ring 12, so that the description of the prior art has been made. As shown in FIGS. 8B and 8C, the valve body 5 does not come off from the groove 2a.

Further, even if the pressure of the control flow B becomes large, since the tubular portion 5a of the valve body 5 is restrained by the displacement prevention ring 12 as described above, the tubular portion 5a does not tilt. Therefore, the lip portion 5 (b) is prevented from expanding excessively. Particularly in this embodiment, since the rib 5c is connected between the tubular portion 5a and the lip portion 5b, the lip portion 5b is surely prevented from expanding excessively, and as a result, the conventional As shown in Fig. 8 (d), which explains the technique, the lip portion
5b does not reverse and is not rolled up.

Instead of the valve body 5 shown in FIGS. 2 to 4, it is of course possible to use the valve body 5 shown in FIG. 7, which is composed only of the tubular portion 5a and the lip portion 5b. In this case, since the rib 5c provided on the valve body 5 in FIGS. 2 to 4 does not exist, it is not necessary to form the cutout groove 12c in the valve body 5 in FIG. Even when using the valve body 5 of FIG. 7,
Since the tubular portion 5a is constrained by the displacement prevention ring 12,
As described above, the free flow A and the control flow B prevent the valve body 5 from coming off and the lip portion 5b from being turned upside down.

[Effect of device]

As described above, in the present invention, since the tubular portion of the valve body is restrained from being deformed by the displacement preventing ring, the deformation of the tubular portion is prevented. There is no displacement or movement of the valve element from the engagement position, and it is possible to prevent the lip portion from reversing, so that the smooth operation of the speed control valve can be secured.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment, FIG. 2 is a perspective view of a valve body, and FIG.
The figure is a bottom view of the valve body, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3,
FIG. 5 is a perspective view of the shift stop ring, FIG. 6 is a cross-sectional view of the valve disc with the shift stop ring attached, FIG. 7 is a perspective view showing another example of the valve disc, and FIG. 8 (a). (D) is explanatory drawing which shows a prior art example. 5 ... Valve body, 5a ... Cylindrical part, 5b ... Lip part, 5c ... Rib, 12 ... Misalignment ring, 12a ... Cylindrical ring part, 1
2b …… Inward flange, 12c …… Notched groove.

Claims (1)

[Scope of utility model registration request] 1. A rubber valve body having a tubular portion and a lip portion continuously extending outward from one end of the tubular portion is provided in an outer peripheral groove of a bush for coaxially dividing a fluid free passage and a control passage. In the engaged speed control valve, the cylindrical ring portion externally fitted to the tubular portion of the valve body and the end face of the tubular portion of the valve body on the free end side of the lip portion are arranged. A speed control valve characterized in that a deviation prevention ring integrally provided with an inward flange is engaged with a tubular portion of the valve body.