JPS5920063B2 - cage valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cage valve equipped with a cage having a plurality of windows on the peripheral wall and a plug that slides inside the cage. ), the valve body can be made smaller.

In recent years, in various technical fields, there has been a demand for lJ left-sided construction for all components in order to reduce the size of devices and reduce costs.

Such requirements are no exception for cage valves that control the flow rate of fluid.

The present invention was made in response to such demands.
The present invention provides a cage valve in which the valve capacity can be increased by an extremely simple structure in which a partition wall is provided protruding from a part of the inner wall of the valve body.

The inventors of the present application conducted various studies on conventional cage valves in response to the above request, and as a result, they found that the following problems existed.

In a conventional cage valve, an annular flow path is formed in a compartment that encloses the cage and faces 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 three directions by the cage swirls around the cage with increasing momentum, This resulted in a violent collision at the opposite side of the entrance.

As a result, severe turbulence occurred in this area, and it was found that the flow of fluid flowing into the gauge from the window near this area was significantly obstructed, and the amount of flow through was restricted.

Therefore, the inventors of the present application focused on such points, and developed a cage that has a plurality of windows on the peripheral wall and is fixed in the inlet side compartment of the valve body. In a cage valve having an area-controlling plug,
A partition wall is provided protruding from the inner wall of the valve body so as to partition the opposite inlet side of the annular flow path formed around the cage, and the protruding end of the partition wall is provided on the outer wall of the cage away from the window position. This suppresses the generation of turbulence caused by fluids with different directions colliding head-on, thereby reducing the flow resistance near the cage window.
This makes it possible to increase the amount of outflow per unit window area.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view of a cage valve according to the present invention, and FIG.
-TI sectional view.

In these figures, what is indicated by the reference numeral 1 is the valve body, and the valve body 1 has a compartment 3 divided into upper and lower parts by a partition wall 2.
, 4, and each compartment 3 and 4 is opened on both sides by a port 6 and an exit lower, respectively.

8 closes the upper opening of this valve body 1 and also closes the valve shaft 9
The upper lid 10 is a cage fixed on the partition wall 2, and the cage 10 has four windows 11 for flow rate control, which are symmetrical about the axis, in the peripheral wall of the cage 10. There is.

A plug 12 that is moved up and down by the valve shaft 9 is fitted into the cage 10, and the flow rate is controlled by changing the opening area of the window 11 by the plug 12.

Reference numeral 13 denotes a partition wall that constitutes a main part of the present invention, and as shown in FIG. Main body 1
It is installed protruding from the inner wall of.

That is, this partition wall 13 is located on the return entrance side of the cage 10,
In other words, the partition wall 13 is protruded from a portion corresponding to the back side of the cage 10 when viewed from the entrance 6 side, and the protruding end of the partition wall 13 is close to the outer wall of the cage 10, avoiding the window 11 of the gauge 10. .

In such a configuration, the fluid from the inlet 6 is
As shown by arrows in the figure, each window 11.
11... and is guided to the exit lower through the inside of the cage 10 and the lower compartment 4, but at this time, the flow that is branched into two directions by the cage 10 is directed to the partition wall 13 side. The flow is guided smoothly and appropriately into the gauge 10 through the two windows 11.11 provided close to the partition wall 13 without causing turbulence due to collisions as in the conventional case. Become.

Here, as a result of an experiment comparing a cage valve equipped with a partition wall 13 as in the present invention and a cage valve without such a partition wall, the increase rate of Cv value at an opening degree of 100 was 5.
4 to 14.5%, and has been confirmed to be extremely effective, especially for valve capacities near fully open.

Although this embodiment shows a case in which the partition wall 13 is formed integrally with the valve body 1, the present invention is not limited to this. For example, a slit may be provided in the inner wall of the valve body 1, and the partition wall may be inserted therein. It may be a fixed structure, or it may be a structure in which a protrusion forming a part of the partition wall is provided on the peripheral wall on the cage 10 side.

Furthermore, it will be more effective if the gap between the partition wall 13 and the gauge 10 is minimized by making the valve body eccentric between the inner wall of the valve body 1 and the cage 10.

As explained above, according to the present invention, a very simple structure in which a partition wall is provided protruding from a part of the compartment in the valve body allows fluid to smoothly flow around the cage and from the window into the gauge. This has the excellent effect of increasing the valve capacity compared to the conventional one, and thus making the valve more compact.

[Brief explanation of the drawing]

The figures show an embodiment of the cage valve according to the present invention, with FIG. 1 being a longitudinal sectional view thereof, and FIG. 2 being a sectional view taken along line II-U. 1... Valve body, 3, 4... Compartment, 6... Inlet, 7
...exit, 10...cage, 11...window, 12.
...Plug, 13...Partition wall.

Claims (1)

[Claims] 1. A cage valve comprising a cage having a plurality of windows on a peripheral wall and fixed in an inlet side compartment of a valve body, and a plug that controls the opening area of the window by moving up and down inside the cage. A partition wall is provided protruding from the inner wall of the valve body so as to partition the opposite inlet side of the annular flow path formed around the cage, and the protruding end of the partition wall is placed on the outer wall of the cage away from the window position. A cage valve characterized in that the cage valves are placed close to each other.