JPS6145416Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cage valve including a cage having a plurality of flow rate control windows on its peripheral wall and a plug for adjusting the opening area of the flow rate control windows.

Conventionally, in this type of cage valve, an annular flow path is formed in a compartment enclosing the cage and facing the inlet side. Therefore, the kinetic energy of the fluid flowing in from the inlet of the valve body increases as the valve opening increases, and the flow branched into two directions by the cage swirls around the cage with increasing momentum. There will be a violent collision at the back of the cage.
For this reason, it is known that severe turbulence occurs in this area, and the flow of fluid flowing into the cage from the window in this area is severely obstructed, limiting the amount of flow through and reducing the outflow ability of the valve. .

Therefore, conventionally, a structure in which a partition wall is provided protruding from the inner wall surface of the valve body to partition the opposite side of the inlet of the annular flow path formed around the cage, or a structure in which the annular flow path is gradually narrowed, has been proposed. A cage valve is used.

However, when manufacturing such a cage valve, in the former case, the parts are attached to the inner wall surface of the valve body, and in the latter case, the parts are also processed on the inner wall surface of the valve body, so each installation and processing work is required. However, there are disadvantages in that it is complicated and costs increase.

This idea was made in view of these circumstances, so
The present invention provides a cage valve in which the outflow capacity of the valve is improved by an extremely simple structure in which guide vanes are provided protruding from the opening edge of a window opening on both flow path sides branched by the cage. Hereinafter, the configuration and the like will be explained in detail by referring to embodiments shown in the drawings.

FIG. 1 is a longitudinal cross-sectional view of a cage valve according to the present invention, and FIG. 2 is a cross-sectional view along the line shown in FIG. 1. In these figures, the reference numeral 1 indicates a valve body having a hole 2 for mounting a cage, which will be described later, and the valve body 1 has partition walls 4 and 5 which are partitioned into upper and lower parts by a partition wall 3. Each compartment 4 and 5 is open on both sides by an inlet 6 and an outlet 7, respectively. 8
is an upper cover that closes the upper opening of the valve body 1 and supports the valve shaft 9 in a slidable manner. Reference numeral 10 denotes a cage whose body consists of a circumferential wall having two diameters, large and small, and is fixed on the partition wall 3. On the small circumferential wall of this cage 10, there are four flow control valves symmetrical about the axis. Windows 11, 11... are bored. 1
Reference numeral 2 denotes a guide vane which is a main part of the present invention and which introduces the flow into the cage 10, and includes the plurality of windows 11, 1.
1, . . . are projecting edges of windows 11, 11 that open on both flow path sides branched by the cage 10, and are located at portions located on the opposite inlet side of the flow path. This makes it possible to increase the flow rate introduced into the cage 10 through the windows 11, 11 having the guide vanes 12. Reference numeral 13 denotes a plug that is moved up and down by the valve shaft 9 and is fitted into the cage 10.
Flow rate control is performed by changing the opening area of 11, .

Therefore, the fluid from the inlet 6 passes through both flow paths branched by the cage 10, that is, the annular flow path formed by the inner wall surface of the partition wall 4 and the outer peripheral surface of the cage 10, as shown by the arrows in the figure. Each window 11, 11,
. . , into the cage 10 and through the lower compartment 5 to the outlet 7. At this time, cage 10
The flow branched into two directions on the inlet side by the guide vanes 12 is introduced into the cage 10 through nearby windows 11, 11, except for a part that swirls around the back side of the cage 10.

Note that a gap of length C is formed between the large circumferential wall of the cage 10 and the wall surface of the hole 2.
0 into the valve body 1. Also,
The small circumferential wall of the cage 10 is formed to have a diameter 2 g smaller than the large circumferential wall, thereby providing guide vanes 12 of sufficient size to effectively introduce flow into the cage 10.

As explained above, according to the present invention, the guide vanes for introducing the flow are provided protrudingly on the edges of the openings of the windows that open on both sides of the flow paths branched by the cage. In addition, the flow rate introduced into the cage before the flow reaches the back side of the cage is increased, and turbulence caused by flow collision is suppressed, thereby improving the outflow capacity of the valve.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a cage valve according to the present invention, and FIG. 2 is a cross-sectional view along the line shown in FIG. 1. 10... Cage, 11... Window, 12... Guide wing, 13... Plug.

Claims (1)

[Scope of utility model registration request] In a cage valve comprising a cage having a plurality of windows on a peripheral wall and a plug that slides inside the cage, an opening edge of the window that opens on both flow path sides branched by the cage among the plurality of windows. And,
A cage valve characterized in that guide vanes for introducing flow are provided protrudingly at portions located on the opposite side of the inlet of the flow path.