JP2020153447A - Porous variable orifice valve - Google Patents

Abstract

To provide a porous variable orifice valve capable of being adjusted finely.SOLUTION: In a porous variable orifice valve, a stationary porous valve plate 12 having a plurality of ports 12a along a cross section of a flow passage, and two movable orifice valve plates 13, 23 are provided in a valve box 11 in parallel in a central axis o direction. Both movable orifice valve plates 13, 23 have a plurality of orifices (holes) 13a, 23a corresponding to each port (hole) 12a of the stationary porous valve plate 12. Each movable orifice valve plate is operable to move vertically or horizontally from the outside of the valve box. Also, a distribution area of a communication opening determined by the holes 12a, 13a, 23a changes finely. Therefore, it is possible to finely adjust a distribution amount (pressure).SELECTED DRAWING: Figure 2

Description

The present invention relates to a porous variable orifice valve provided in a pipe for transporting a liquid such as water and sewage, industrial water, agricultural water, hydroelectric water, and cooling water for a hot air valve.

As shown in FIG. 4, this type of porous variable orifice valve has a fixed porous valve plate 2 having a plurality of ports 2a along a flow path cross section in a valve box 1, and each port of the fixed porous valve plate 2 ( A movable orifice valve plate 3 having a plurality of orifices (holes) 3a corresponding to the holes 2a and provided so as to be movable over a position where each port 2a of the fixed porous valve plate 2 is closed and a position where the port 2a is opened. Be prepared.
A valve rod 4 is provided on the movable orifice valve plate 3, and the valve rod 4 is connected to an electric motor 6 or the like via a coupling 5. Therefore, the valve rod 4 moves up and down by driving the electric motor 6, and the movable orifice valve plate 3 also moves up and down as the electric motor 6 moves up and down, and each port 2a of the fixed porous valve plate 2 and the orifice 3a of the movable orifice valve plate 3 Correspondence relationship changes. The circulation area of the porous variable orifice valve V'is adjusted by the degree of correspondence between the two holes 2a and 3a (the degree of elevation of the valve stem 4), and the water flow rate is continuously adjusted. This adjustment also adjusts the flow pressure by increasing or decreasing the pressure (see Patent Documents 1 to 5).
In the figure, reference numeral 7 denotes a recess for allowing a fluid w such as water to flow through the entire orifice 3a.

Most of the conventional perforated variable orifice valves V'are adjusted in flow rate (pressure) by two valve plates, a fixed perforated valve plate 2 and a movable orifice valve plate 3 (see Patent Document 1). There is a technique of using three valve plates (see Patent Document 2). In this technique, fixed perforated valve plates are provided on both sides of a movable orifice valve plate.

Jikkenhei 02-124376 Gazette Jikkenhei 07-29366 Gazette Japanese Unexamined Patent Publication No. 2014-234876 Jikkenhei 02-98272 Gazette

The porous variable orifice valve V'having the above two valve plates 2 and 3 adjusts the hydraulic power (water volume) at the opening formed by overlapping the holes 2a and 3a of the fixed porous valve plate 2 and the movable orifice valve plate 3. To do. Since the adjustment is performed only by the vertical movement of the movable orifice valve plate 3 accompanying the raising and lowering of the valve rod 4, the degree of opening adjustment (size) of the opening is determined by each of the fixed porous valve plate and the movable orifice valve plate. It can be adjusted only by the degree of overlap of the holes 2a and 3a, and it is difficult to finely adjust the flow rate.

Further, in the porous variable orifice valve having three valve plates, fixed porous valve plates are provided on both sides of the movable orifice valve plate, and the holes of the fixed porous valve plates on both sides are on the same axis (same position). ing. Therefore, similarly, the hydraulic power is adjusted by the opening created by the overlap of the holes of the two fixed porous valve plates and the movable orifice valve plate. At this time, since the adjustment is performed only by the vertical movement of one movable orifice valve plate accompanying the raising and lowering of the valve stem, the degree of opening adjustment of the opening is on the same axis of the fixed porous valve plates on both sides. It can be adjusted only by the degree of overlap between each port and each orifice (hole) of the movable orifice valve plate, and it is difficult to finely adjust the flow rate (see Patent Document 2).

An object of the present invention is to provide a perforated variable orifice valve that can be finely adjusted under the above circumstances.

In order to achieve the above object, the present invention has decided to provide two or more movable orifice valve plates.
If there are two or more movable orifice valve plates, the flow amount can be adjusted by the individual independent movements of the movable orifice valve plates, so that the flow amount can be finely adjusted.

Specifically, a fixed porous valve plate having a plurality of ports along the cross section of the flow path and a position having a plurality of orifices corresponding to each port of the fixed porous valve plate and closing each port of the fixed porous valve plate. Two or more movable orifice valve plates movably provided over the opening position are provided in parallel in the valve box in the direction of the central axis, and each movable orifice valve plate is operated from outside the valve box. We adopted the possible configuration.

The moving direction of each of the movable orifice valve plates is arbitrary, but if there are two movable orifice valve plates, it is easy to make the moving directions the same, for example, depending on the main shaft and the sub shafts therein. If a valve shaft structure having a double pipe structure or the like is used, compactness can be achieved.
On the other hand, if each movable orifice valve plate moves in a different direction, the valve shaft structure becomes simpler (see the embodiment below), and the degree of overlap between the port of the perforated fixed valve plate and the orifice of the movable orifice valve plate becomes finer. You can make fine adjustments. At this time, if the number of movable orifice valve plates is two and the moving directions of the two movable orifice valve plates are orthogonal to each other, the degree of overlap of the orifices of the two movable orifice valve plates with respect to the port of the fixed porous valve plate is simple. Therefore, it is easy to fine-tune the distribution area.

In the present invention, since the number of movable orifice valve plates is two or more as described above, the porous variable orifice valve can be finely adjusted. In addition, it has a multi-stage decompression performance that can be finely adjusted.

Schematic front view of an embodiment of a porous variable orifice valve according to the present invention. Cutting side view of the same embodiment Explanatory drawing of each action of the same embodiment Partially cut perspective view of an example of a conventional perforated variable orifice valve

An embodiment of the porous variable orifice valve V according to the present invention is shown in FIGS. 1 to 3, and the porous variable orifice valve V has a flow path in the cast steel valve box 11 as shown in FIGS. 1 and 2. A stainless steel fixed perforated valve plate 12 having a plurality of ports 12a along a cross section, and a plurality of orifices (holes) 13a and 23a corresponding to each port (hole) 12a of the fixed perforated valve plate 12 and having a fixed perforation. It includes two stainless steel movable orifice valve plates 13 and 23 that are movably provided over a position where each port 12a of the valve plate 12 is closed and a position where the port 12a is opened.

A feature of the embodiment according to the present invention is that two movable orifice valve plates 13 and 23 are provided, and an electric motor 6 (see FIG. 4) is attached to each of the movable orifice valve plates 13 and 23.
The two movable orifice valve plates 13 and 23 and the fixed perforated valve plate 12 are arranged (parallel) in order in the central axial direction o of the valve box 11.
Further, the fixed perforated valve plate 12 and the two movable orifice valve plates 13 and 23 correspond to the ports 12a and the orifices 13a and 23a (which are on the same axis when the valve is opened as shown in FIGS. 2 and 3C). Have the same size (same diameter). The pore diameters of the ports 12a and the orifices 13a and 23a are set so that the outer ports 12a and the orifices 13a and 23a are smaller than the pore diameters of the ports 12a and the orifices 13a and 23a at the center of the distribution cross section (see FIG. 1). The degree of change in diameter is also determined as appropriate by experiments, etc., taking into consideration the degree of cavitation, such as gradual or gradual.

When the perforated variable orifice valve V can be fully closed, at least one of the orifices 13a and 23a is set to be hidden between the ports 12a. That is, in the central axial direction o, the fixed porous valve plate 12 is set so that the orifice 13a or 23a of at least one of the movable orifice valve plates 13 or 23 is completely closed (FIGS. 3A and 3B). )reference). Further, for convenience, the central axis direction of the valve box 11 and the center of the port 12a of the fixed porous valve plate 12 are designated by the symbol "o", and the central axis of the valve shafts 14 and 24 and the orifice 13a or 23a of the movable orifice valve plate 13 or 23 are designated. The center of is the code "c, c'".

Valve rods 14 and 24 are provided on the central axes c and c'in the vertical or horizontal directions of both movable orifice valve plates 13 and 23, one valve rod 14 is in the vertical direction and the other valve rod 24 is in the horizontal direction. (Horizontal direction), and each is connected to an electric motor 6 or the like via a coupling 5. That is, both valve stems 14 and 24 have an angle θ of 90 degrees. In addition to 90 degrees, this angle θ is arbitrarily and appropriately set to, for example, 60 degrees, 45 degrees, etc. in consideration of the installation location of the valve V, the installation space of the electric motor, and the like. Both valve stems 14 and 24 are connected to the movable orifice valve plates 13 and 23 by fitting the bulging ends 14a and 24a into the fitting holes 13b and 23b of the movable orifice valve plates 13 and 23. .. In addition, in FIGS. 1 to 3, the same reference numerals as those in FIG. 4 indicate the same thing.

The porous variable orifice valve V of this embodiment has the above configuration. Now, when the valve rods 14 and 24 are moved up and down and left and right by an electric motor 6 and the like, the movable orifice valve plates 13 and 23 also move up and down and left and right (FIG. 3 (FIG. 3). The correspondence between each port 12a of the fixed perforated valve plate 12 and the orifices 13a and 23a of the movable orifice valve plates 13 and 23 changes according to a) and (see the chain line arrows in (b)). The flow area of the perforated variable orifice valve V is adjusted and the flow rate is continuously adjusted by the degree of correspondence of the holes 12a, 13a, and 23a (the degree of elevation / lateral movement of the valve rods 14 and 24).

That is, as shown in FIG. 3C, when the axes of the ports 12a of the fixed perforated valve plate 12 and the orifices 13a and 23a of the movable orifice valve plates 13 and 23 are the same (port 12a). (When the axis is the same as the axis o), the perforated variable orifice valve V is in a fully open state, and a flow rate of water w having a distribution area having the sizes of both holes 12a, 13a, and 23a flows.

On the other hand, as shown in FIG. 3D, when the orifices 13a and 23a of both movable orifice valve plates 12 and 23 are completely separated from the ports 12a of the fixed porous valve plate 12, the orifices of the movable orifice valve plates 13 and 23 are formed. 13a and 23a are completely closed by the fixed perforated plate 12, and the perforated variable orifice valve V is closed.

Next, when the valve rods 14 and 24 move up and to the right and the amount of movement is the same, as shown by the broken line in FIG. 3 (e), both movable orifice valve plates 12 23 rises and moves to the right, and the axial centers of the ports 12a of the fixed perforated valve plate 12 and the orifices 13a and 23a of the movable orifice valve plates 13 and 23 are displaced, and the ports 12a and the front and rear orifices 13a and 23a form. distribution holes, a degree of opening of the area S ₁ of the hatched portion by solid line in FIG. 3 (e).

Further, as shown in FIG chain line, the right movement of the movable orifice valve plate 23 is small, the port 12a and the front and rear of the orifice 13a, through-holes are formed by 23a, as shown in FIG. 3 from the area S ₁ of the (e) The opening degree is increased by the area S ₂ of the shaded portion due to the chain line (S ₁ + S ₂ ).
As for the change in the distribution area due to the left-right movement of the valve stem 24, the same flow rate change can be obtained by raising and lowering the orifice 13a accompanying the raising and lowering of the valve stem 14.

In this way, the ports 12a and the orifices 13a, depending on the amount of elevation / left / right movement of both movable orifice valve plates 13 and 23 with respect to the fixed perforated valve plate 12 based on the amount of elevation / movement of the valve rods 14 and 24 to the left and right. The degree of opening through which 23a communicates changes, and the amount of water w circulated according to the opening area. The degree of change becomes complicated (fine) depending on the degree of elevation / left / right movement of both movable orifice valve plates 12 and 23. Therefore, by experiments, etc., it is measured how the distribution amount changes according to the amount of movement of the movable orifice valve plates 12 and 23 to the left and right, and based on the measured value, the required distribution amount is obtained. The amount of elevation / left / right movement is set so as to be.

Since the both movable orifice valve plates 13 and 23 of the embodiment of θ: 90 degrees move in the vertical direction and the horizontal direction, the orifices of the two movable orifice valve plates 13 and 23 with respect to the port 12a of the fixed porous valve plate 12 The degree of overlap of 13a and 23a is simpler than that in the case other than the case where the angle θ: 90 degrees, and the fine adjustment of the distribution area is easy.

The perforated variable orifice valve V allows the required flow rate to flow without being fully closed even in the valve closing limit state in which the movable orifice valve plates 13 and 23 are raised and moved to the right, as shown in FIG. 3D. be able to. As a means for allowing a constant flow rate to flow even in the valve closing limit state, when the valve rods 14 and 24 are raised and moved to the maximum, each port 12a of the fixed porous valve plate 12 and the movable orifice valve plates 13 and 23 are used. Even if the orifices 13a and 23a of the above are circular holes of the same diameter, they may not be completely closed, or the shapes of the ports 12a and the orifices 13a and 23a may be different from those of, for example, the former being elliptical and the latter being circular. An overlapping portion (a portion that is not closed) may be present regardless of the position of the two (see Patent Document 3, Specification Paragraph 0027, FIG. 3 (b)).

The number of the movable orifice valve plates 13 and 23 is not limited to two, and any number is arbitrary as long as it is three, four and two or more, and the parallel order thereof is also the movable orifice valve plate 13 and the fixed porous valve plate. 12. Like the movable orifice valve plate 23, there are movable orifice valve plates 13 and 23 on both sides of the fixed porous valve plate 12, which is optional.
Further, both movable orifice valve plates 13 and 23 can be made movable in the vertical direction. In this case, for example, a valve shaft structure having a double pipe structure consisting of a main shaft and a sub-shaft within the main shaft as shown in FIG. 1 of Patent Document 4 or the like is used.
Further, in the above embodiment, the fluid is water w, but it goes without saying that the porous variable orifice valve according to the present invention can be adopted even in a gas other than water or a gas such as gas.
Thus, it should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1,11 Valve box 2,12 Fixed porous valve plate 2a, 12a Port (hole) of fixed porous valve plate
3, 13, 23 Movable orifice valve plate 3a, 13a, 23a Orifice (hole) of the movable orifice valve plate
4, 14, 24 Valve rod (valve shaft)
5 Coupling 6 Electric motor V, V'Perforated variable orifice valve w Fluid (water)
s ₁ , s ₂ Distribution area

Claims (4)

It has a fixed porous valve plate (12) having a plurality of ports (12a) along the flow path cross section, and a plurality of orifices (13a, 23a) corresponding to each port (12a) of the fixed porous valve plate (12). , Two or more movable orifice valve plates (13, 23) provided so as to be movable over a position where each port (12a) of the fixed perforated valve plate (12) is closed and a position where the port (12a) is opened. A porous variable orifice valve provided in (11) in parallel in the direction of the central axis (o), and the movable orifice valve plates (13, 23) can be operated from outside the valve box (11), respectively. The porous variable orifice valve according to claim 1, wherein the movable orifice valve plates (13, 23) are two pieces, and the moving directions thereof are the same. The perforated variable orifice valve according to claim 1, wherein the movable orifice valve plates (13, 23) have different moving directions. The porous variable orifice valve according to claim 3, wherein the movable orifice valve plates (13, 23) are two, and the moving directions of the two movable orifice valve plates (13, 23) are orthogonal to each other.

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