JPS6246048Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a cage valve comprising a cage having a plurality of windows on the peripheral wall and a plug that slides inside the cage, and particularly relates to a cage valve that is equipped with a cage having a plurality of windows on a peripheral wall and a plug that slides inside the cage. The present invention relates to an improvement in a cage valve that can achieve miniaturization of the valve body by increasing the Cv value.

[Conventional technology]

2. Description of the Related Art In recent years, in various technical fields, there has been a demand for miniaturization of all components in order to reduce the size of devices and reduce costs. This requirement is no exception for cage valves that control the flow rate of fluid.

That is, this type of conventional cage valve generally has
The cage includes a cage having a plurality of windows on the peripheral wall and fixed in the inlet side compartment of the valve body, and a plug that moves up and down inside the cage, and the opening area of the window is controlled by moving the plug up and down. , and is configured to control the flow rate of fluid flowing into the cage from this window.

[Problem that the invention attempts to solve]

However, with the conventional cage valve having the above-mentioned configuration, it is not possible to obtain a flow rate commensurate with the opening area of the window adjusted and controlled by the plug, resulting in problems such as a decrease in valve capacity. Therefore, in order to ensure a predetermined flow rate, it is necessary to make the cage window etc. large, which leads to an increase in the size of the valve body.

The inventors of the present application have investigated various conventional cage valves in response to the above-mentioned requirements and have found the following problems.

That is, in a conventional cage valve, an annular flow passage is formed in a compartment that contains 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 becomes larger, and the flow that is divided into two by the cage swirls around the cage with increasing force and collides violently on the back side of the cage (the part opposite the inlet side). As a result, it was found that a violent turbulence occurs in that part, and the flow of the fluid flowing into the cage through the window in that vicinity is significantly obstructed, limiting the amount of throughflow.

[Means for solving problems]

Therefore, by focusing on these points, the inventors of the present invention designed the cage valve according to the present invention to have a structure in which the cage valve is designed so as to block the opposite inlet side of the annular flow path formed around the cage, that is, the turbulent flow generating portion. A partition wall is provided protruding from the inner wall of the main body, and its protruding end is brought close to the cage outer wall so as to be sandwiched between the two windows, avoiding the window position, and both side edges of this partition wall are connected to the opening edges of the two windows. The structure is such that it is formed along the following lines.

[Effect]

According to the present invention, the presence of the partition wall in the part where turbulence occurs in the annular flow path around the cage suppresses the occurrence of turbulence, and the wall surface formed to match the edge of the window opening of the partition wall Therefore, the flow of fluid can be rectified, the valve capacity can be increased, and the valve body can be made smaller.

〔Example〕

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

1 and 2 show an embodiment of the cage valve according to the present invention. In these figures, the reference numeral 1 indicates a valve body;
has a compartment 3 partitioned into upper and lower parts by a partition wall 2;
4, each of these compartments 3 and 4 being open on both sides by an inlet 6 and an outlet 7, respectively. 8 is an upper lid that closes the upper opening of the valve body 1 and slidably supports the valve shaft 9; 10 is a cage fixed within the inlet side compartment 3 on the partition wall 2; There are four flow control windows 11, 11, . 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 windows 11, 11, . . . by the plug 12. .

Reference numeral 13 denotes a partition wall which is a main part of the present invention, and this partition wall 13 is connected to the cage 10 as shown in FIG.
The valve body 1 is provided in a protruding manner on the inner wall of the valve body 1 so as to block an annular flow path formed around the flow path at the center of the flow path. That is, this partition wall 13 is provided in a protruding manner at a portion corresponding to the opposite side of the cage 10 from the entrance, that is, the back side of the cage 10 when viewed from the entrance 6 side, and its projecting end is located at the position of the window 11 of the cage 10. It is placed close to the outer wall of the cage 10 so as to be sandwiched between the two windows.

Further, in this partition wall 13, both side edges 13a, 13a are formed in a shape along the side opening edges 11a, 11a of the cage windows 11, 11 adjacent to each other.

FIG. 3 is an expanded view showing this state, and as shown in the figure, both side edges 13a, 13a of the partition wall 13 protruding from the inner wall 3a of the partition wall 3 are perforated in the cage 10. It is formed along the side opening edges 11a, 11a of the two windows 11, 11. Therefore, the inner surface of the protruding end of the partition wall 13 faces the hatched portion of the cage 10 in the figure.

Figures 4 to 6 show the shapes of partition walls corresponding to various flow control windows known in this type of cage valve, and in each of these figures, a represents the window 1.
1 and b indicates the cross-sectional shape of the partition wall 13. Note that FIG. 4 shows the case where the flow rate characteristics are equal percentage, FIG. 5 shows the case where they are linear, and FIG. 6 shows the case where the flow characteristics are on/off.

According to such a configuration, the fluid flowing in from the inlet 6 flows through the annular flow path formed by the inner wall surface of the compartment 3 and the outer peripheral surface of the cage 10, as shown by the arrow in FIG. The flow passes through the windows 11, 11, . The two windows 11 are guided toward the partition wall 13 and are provided close to the partition wall 13 and along the partition surface without causing turbulent flow due to collision as in the conventional case.
11 into the cage 10 smoothly and appropriately.

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, it was found that at 100% valve opening
The increase rate of Cv value is 5.4 to 14.5%, and it has been confirmed that it is extremely effective, especially for valve capacity near fully open.

Although this embodiment shows a case where 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 formed therein. It may be a structure in which it is inserted and fixed, or it may be a structure in which a protrusion forming a part of the partition wall is also provided on the peripheral wall on the cage 10 side. Furthermore, if the gap between the partition wall 13 and the cage 10 is minimized by making the valve body 1 eccentric between the inner wall of the valve body and the cage 10,
This makes it more effective.

[Effect of idea]

As explained above, according to the cage valve according to the present invention, a partition wall is provided protruding from the inner wall of the valve body so as to block the opposite inlet side of the annular flow path formed around the cage, and the protruding end is Since the window is placed close to the outer wall of the cage so as to be sandwiched between the two windows, and the edges on both sides of the partition wall are formed along the opening edges of the two windows, the structure is simple and inexpensive. Regardless of the situation, the fluid flow around the cage and its windows into the cage can be made smoother, and the valve capacity can be increased compared to conventional ones, which has various practical advantages such as making the valve more compact. It has a positive effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the cage valve according to the present invention, Fig. 2 is a cross-sectional view taken along the line -
The figure shows the relationship between the cage and the partition wall, and FIGS. 4 to 6 show other embodiments, in which a is a front view of the cage and b is a sectional view of the partition wall. 1... Valve body, 3, 4... Compartment, 6... Inlet,
7...exit, 10...cage, 11...window, 11
a...Opening edge, 12...Plug, 13...Partition wall, 13a...Edge.

Claims (1)

[Scope of utility model registration request] 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 an opening area of the window by moving up and down inside the cage. A partition wall is protruded from the inner wall of the valve body so as to block the opposite inlet side of the annular flow path formed around the cage, and the protruding end is placed on the outer wall of the cage so that it is sandwiched between the two windows, avoiding the window position. A cage valve characterized in that the partition wall is located close to the partition wall, and both side edges of the partition wall are formed along the opening edges of the two windows.