JP4920453B2 - Variable orifice device - Google Patents

Description

  The present invention relates to a variable orifice device for distributing an appropriate flow rate to each branch pipe in a plurality of fluid pipes that are branched.

  In a pipeline branched from a single fluid pipeline source into a plurality, it is required to distribute an appropriate flow rate for an intended purpose to each branch pipeline. Therefore, there are cases where adjustments are made as much as possible from valves such as ball valves and gate valves, which are arranged in each branch pipe in the piping, but these valves are originally intended for opening and closing operations. This is not suitable for flow control.

  On the other hand, the flow rate control valve includes a needle valve and an orifice valve, but their application range is limited to a small-diameter pipe having a diameter of about 25 mm or less (see, for example, Patent Document 1).

  On the other hand, a butterfly valve is commercially available as a flow control valve having a large capacity, but this butterfly valve has only a diameter of 100 mm or more. In addition, the equipment is large and expensive.

Accordingly, there is a problem that an appropriate flow control valve is not commercially available with a diameter of 25 to 100 mm that is generally used, and a large-diameter flow control valve is large and expensive.
JP 2000-065015 A

  Therefore, a so-called fixed orifice method is used to adjust the flow rate of a normal pipe branching system. Here, based on the designed piping system, the resistance coefficient of various parts and pipes in the pipe is estimated, the resistance of each branch pipe is calculated by a calculation formula, and the flange at the branch point of each pipe is calculated. An appropriate flow rate is distributed by inserting a fixed orifice between them to achieve a balance.

  However, in the fixed orifice method based on this calculation, the resistance of various parts in an actual piping system and the piping resistance often deviate from those calculated. Therefore, after the start of operation, if an imbalance in the flow distribution is found, it may happen that the fluid in the pipe is stopped and the fluid is removed from the pipe, and the size of the fixed orifice is investigated and replaced by trial and error. is doing.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a variable orifice device that can perform simple and accurate flow control of a fluid flowing in a pipeline.

According to the present invention, in the fluid pipe connected to the flange, a bolt hole having the same diameter as that of the flange and for inserting a bolt common to the flange is opened near the flange. a fixed orifice having at least one eccentric hole, which has an outer peripheral surface of smaller diameter than coaxial with and said bolt hole in the pipe, can rotating around the axis of the conduit with respect to the fixed orifice A variable orifice device in which a movable orifice having at least one eccentric hole is coaxially overlapped so that the area of the communicating portion of the eccentric holes of both orifices can be varied. And an operation portion for rotating the tube around the axis of the pipe, the operation portion being a rod-like member that is detachably inserted into a hole provided in the outer peripheral surface of the movable orifice, As the bolt when using Jo members do not interfere with the position of said plurality of holes is configured that a variable orifice device according to claim which is set so as not to coincide with the position of the bolt holes at the same time.

As in the second aspect of the invention, the pipe line is flange-connected, and an O-ring is interposed between both orifices and between the movable orifice and the flange on the side facing the movable orifice. It is preferable.

As in the third aspect of the invention, the O-ring is preferably interposed on the outer peripheral surface of the movable orifice.

According to the present invention, in the fluid pipe connected to the flange, the bolt holes for inserting the bolt common to the flange and the same diameter as the flange so as to be fixed to the flange are respectively provided in the vicinity of the peripheral end. opened, a fixed orifice having at least one eccentric hole, which has an outer peripheral surface of smaller diameter than coaxial with and the bolt holes in the conduit, times around the axis of the conduit with respect to the fixed orifice By interposing the movable orifice having at least one eccentric hole that can be rolled in a coaxially stacked state, the area of the communicating portion of the eccentric holes of both orifices can be made variable. The fluid resistance when the fluid passes through the hole communicating portion can be arbitrarily changed. As a result, it is possible to obtain a variable orifice device that can easily and accurately adjust the flow rate of the pipeline without adding a special flow control valve or the like to the pipeline.

Further, by combining the number or shape of the eccentric holes of both orifices according to the diameter of the pipe line, the nature of the fluid, the flow rate or the control amount, the flow rate can be adjusted according to each requirement.

Further, a fixed orifice fixed to the conduit, since it is a movable orifice having a coaxial outer peripheral surface of the rotatable and to the conduit about the axis of the conduit may be a simpler configuration.

In addition , an operation unit for rotating the movable orifice around the axis of the pipe line is provided. By operating this operation part, the movable orifice is rotated around the axis of the pipe line, and the eccentricity of both orifices is detected. The area of the communicating part of the hole can be easily changed, whereby the flow rate of the pipe can be easily adjusted.

In addition , since the operation unit is a rod-like member that is detachably inserted into a hole provided on the outer peripheral surface of the movable orifice, when adjusting the flow rate, the rod-like member is attached to adjust the required flow rate, while the flow rate adjustment is performed. When the operation is not performed, removing the rod-shaped member eliminates the possibility of adjusting the flow rate by mistake.

According to the invention described in claim 2 , the pipe line is flange-connected, and an O-ring is interposed between the two orifices and between the movable orifice and the flange on the side facing the movable orifice. Therefore, even when the fluid passes through the pipeline, the movable orifice can be rotated around the axis of the pipeline, thereby stopping the fluid in the pipeline or in the pipeline. The flow rate can be easily adjusted without removing the fluid once.

According to the third aspect of the present invention, since the O-ring is interposed on the outer peripheral surface of the movable orifice, an excessive force is not applied to the O-ring when the movable orifice is rotated, and its life is extended. Become.

  FIG. 1 is a cross-sectional view showing the overall configuration of a variable orifice device according to an embodiment of the present invention. In addition, the flow direction of the fluid (water or the like) in FIG.

  In this variable orifice device, for example, as shown in FIG. 1, a fixed orifice (first orifice) 3 is arranged between a flange 1 of a fluid pipe p1 and a flange 2 of a fluid pipe p2, A movable orifice (second orifice) 4 is disposed adjacent to the fixed orifice 3 so as to be rotatable at the center of the pipe line. Reference numeral 7 denotes a spacer.

  The flanges 1, 2, the fixed orifice 3, and the spacer 7 have the same diameter, and bolt holes 9 through which a common bolt 8 is inserted are opened near the peripheral ends thereof. The fixed orifice 3 is fixed to the flange 1 using a knock pin 10. However, depending on the fastening force of the bolt 8, the knock pin 10 can be omitted.

  The fixed orifice 3 is formed in a substantially disc shape, and the movable orifice 4 is formed in a substantially cylindrical shape. Each of the orifices 3 and 4 has at least one or more holes (eccentric holes) 11 and 12 in advance. Is provided.

  The outer diameter of the movable orifice 4 is matched with the outer diameters of the pipes p1 and p2, and a flange portion having a smaller diameter than the bolt hole 9 of the flanges 1 and 2 is formed in the middle in the longitudinal direction.

  A hole having a predetermined shape is formed in the fixed orifice 3, and a seal groove is formed on the side wall of the hole. One end of the movable orifice 4 can be fitted into this hole via the O-ring 14, but the O-ring 14 is held in the seal groove at that time (so-called inlay).

  The inner diameter of the spacer 7 is set to be slightly larger than the outer diameter of the movable orifice 4, and a seal groove is similarly formed on the inner diameter side of the spacer 7. The other end of the movable orifice 4 can be fitted to the inner diameter side of the spacer 7, but the O-ring 14 is also held in the seal groove at that time.

  And the front-end | tip of the tool bar (bar-shaped member, operation part) 6 is inserted in the hole 5 provided in the appropriate location of the collar part of the movable orifice 4, and the rear end of this tool bar 6 is struck with a hammer etc., for example. Thus, by rotating the movable orifice 4 in the circumferential direction of the pipes p1 and p2, the shape or size of the portion 13 that communicates the hole 11 of the fixed orifice 3 and the hole 12 of the movable orifice 4 changes, As a result, the flow rate can be adjusted. It should be noted that the positions of the plurality of holes 5 are set not to coincide with the positions of the bolt holes 9 so that the bolts 8 do not interfere when the tool bar 6 is used.

  4 is a front view in which the holes of the fixed orifice and the movable orifice are crescent shaped (an example in which they are arranged in reverse), and FIG. 5 is a front view in which the holes in the fixed orifice and the movable orifice are in an elliptical shape (examples in which they are arranged in reverse) 6 is a front view in which the holes of the fixed orifice and the movable orifice are made semi-circular (example in reverse arrangement), and FIG. 7 is a front view in which the holes in the fixed orifice and the movable orifice are two punched holes (in reverse arrangement). Example), Fig. 8 is a front view in which the holes of the fixed orifice and the movable orifice are semi-rounded into two punching holes (example of reverse arrangement), and Fig. 9 is the punching of four holes in the fixed and movable orifices are semi-circular Fig. 10 shows a front view with holes formed (reversed arrangement example), and Fig. 10 shows a front view with a fixed orifice and movable orifice holes modified (reversed arrangement example). Is a fixed orifice, ( ) Has shown the movable orifice, respectively show the hole by hatching.

  In any case, with respect to the shape and size of the holes 11 and 12 of both the orifices 3 and 4, the flow rate of the fluid passing through both the orifices 3 and 4 depends on the rotation angle of the movable orifice 4. Twelve non-overlapping areas can be estimated by calculating in advance.

  In general, the larger the number of the holes 11 and 12 opened in both the orifices 3 and 4, the less the cavitation. Accordingly, it is desirable to determine the size, number, and shape of the holes 11 and 12 after verification and examination including the manufacturing cost.

  Hereinafter, a method for using the variable orifice device will be described in brief.

  In FIG. 1, a fixed orifice (first orifice) 3 is arranged between the flange 1 of the fluid pipe line p1 and the flange 2 of the fluid pipe line p2, and is adjacent to the fixed orifice 3 at the center of the pipe line. A rotatable movable orifice 4 is disposed, and a spacer 7 is disposed adjacent to the movable orifice 4.

  At that time, an O-ring 14 is interposed on the outer peripheral surface of one end of the movable orifice 4 fitted in the hole of the fixed orifice 3, and the outer peripheral surface of the other end of the movable orifice 4 fitted in the inner peripheral surface of the spacer 7. Also, an O-ring 14 is interposed.

  Further, the fixed orifice 3 is fixed to the flange 1 using the knock pin 10 through the bolt 8 in a state where the flanges 1, 2, the fixed orifice 3, the movable orifice 4 and the spacer 7 are combined.

  The hole 11 of the fixed orifice 3 and the hole 12 of the movable orifice 4 are initially in the same position, and in this state, the fluid is passed between the pipes p1 and p2. If the flow rate at this time is significantly different from the desired value, the bolt 8 is loosened so that the movable orifice 4 can be rotated with respect to the fixed orifice 3.

  And the front-end | tip of the tool stick | rod (bar-shaped member, operation part) 6 is inserted in the hole 5 provided in the appropriate location of the collar part (outer peripheral surface) of the movable orifice 4, and the rear end of this tool stick | rod 6 is made into a hammer etc., for example The movable orifice 4 is rotated in the circumferential direction of the pipes p1 and p2.

  Then, the shape or size of the portion 13 that communicates the hole 11 of the fixed orifice 3 and the hole 12 of the movable orifice 4 changes, thereby adjusting the flow rate.

  Here, even if the fluid is passing through the pipes p1 and p2, the movable orifice 4 can be rotated around the axis of the pipes p1 and p2, thereby causing the pipes p1 and p2 to rotate. It is possible to easily adjust the flow rate without stopping the fluid in the pipe or once removing the fluid in the pipes p1 and p2. Further, since the O-ring 14 is interposed in the collar portion on the outer peripheral surface of the movable orifice 4, no excessive force is applied to the O-ring 14 when the movable orifice 4 is rotated, and its life is long. Become.

  According to the present invention, the fluid pipes p1 and p2 have the fixed orifice 3 having the hole 11 and the hole 12 that can rotate relative to the fixed orifice 3 around the axis of the pipes p1 and p2. By interposing the movable orifice 4 in a state of being coaxially overlapped, the area of the communicating portion of the holes 11 and 12 of both the orifices 2 and 4 can be made variable. The fluid resistance when the fluid passes through the twelve communicating portions can be arbitrarily changed. As a result, it is possible to accurately adjust the flow rate of the pipeline while having a simple configuration without additionally providing a special flow control valve or the like in the pipelines p1 and p2.

  For example, by combining the numbers or shapes of the holes 11 and 12 of the fixed orifice 3 and the movable orifice 4 according to the diameters of the pipes p1 and p2, the properties of the fluid, the flow rate, or the control amount, the flow rate according to each requirement Adjustments can be made.

  In addition, when the flow rate is adjusted as described above, the tool bar 6 is attached to perform the necessary flow rate adjustment, while when the flow rate adjustment is not performed, the tool bar 6 is removed so that there is no risk of erroneously adjusting the flow rate. .

FIG. 2 is a cross-sectional view showing the overall configuration of a variable orifice device according to another embodiment of the present invention, and FIG. 3 is a cross-sectional view showing the overall configuration of a variable orifice device according to still another embodiment of the present invention. The reference numerals in both figures are the same as those in FIG.

  Among these variable orifice devices, for example, the one shown in FIG. 3 has the simplest configuration, and the one shown in FIG. 2 has an intermediate configuration between those shown in FIG. 1 and FIG. Specifically, both have the same effects as described above. However, in the variable orifice shown in FIG. 3, since the O-ring 14 is interposed on both the left and right sides of the movable orifice 4, it is easy to apply an excessive force to the O-ring 14 when the movable orifice 4 is rotated. The exchange interval may be slightly shorter.

  In this respect, in the variable orifice shown in FIG. 2, the O-ring 14 is interposed on the side surface on one side of the movable orifice 4 and on the outer peripheral surface on the other side. , Which is intermediate between those shown in FIG.

  In the above embodiment, the first orifice is the fixed orifice 3 and the second orifice is the movable orifice 4. However, the first and second orifices may be the movable orifice.

  In the above embodiment, in FIG. 1, the spacer 7 is used separately from the flange 2, and the other end of the movable orifice 4 is brought into contact with the spacer 7. But you can. In that case, the number of parts is reduced, and maintenance is facilitated.

  Furthermore, in the said embodiment, although pipe line p1, p2 is flange-connected, even if it is another connection method, it cannot be overemphasized that the variable orifice apparatus of this invention can be applied in the pipe line. Nor.

It is sectional drawing which shows schematic structure of the variable orifice apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows schematic structure of the variable orifice apparatus which concerns on other embodiment of this invention. It is sectional drawing which shows schematic structure of the variable orifice apparatus which concerns on further another embodiment of this invention. It is the front view which made the hole of a fixed orifice and a movable orifice crescent type (example assembled in reverse arrangement). It is the front view which made the hole of a fixed orifice and a movable orifice elliptical (example assembled in reverse arrangement). It is the front view which made the hole of a fixed orifice and a movable orifice semicircular (example assembled in reverse arrangement). It is the front view which made the hole of a fixed orifice and a movable orifice into two punching holes (example assembled in reverse arrangement). It is the front view (example assembled in reverse arrangement) which made the hole of a fixed orifice and a movable orifice into two punching holes. It is the front view (example assembled in reverse arrangement) which made the hole of a fixed orifice and a movable orifice semicircular into four punching holes. It is the front view which made the hole of the fixed orifice and the movable orifice into a different shape.

Explanation of symbols

1 Flange 2 Flange 3 Fixed orifice (first orifice)
4 Movable orifice (second orifice)
5 hole 6 tool bar (operation member, operation part)
11 Fixed orifice hole (eccentric hole)
12 Movable orifice hole (eccentric hole)
13 Portion of communication between holes 14 O-ring p1 pipe line p2 pipe line

Claims (3)

In the fluid conduit that is flanged ,
A fixed orifice having at least one eccentric hole , each of which has a bolt hole through which a bolt common to the flange is inserted in the vicinity of the circumferential end, the same diameter as the flange, so as to be fixed to the flange ;
And it has a coaxial with and the outer peripheral surface of smaller diameter than the bolt holes in the conduit, and a movable orifice having at least one eccentric hole around the axis rotation possible of the conduit with respect to the fixed orifice A variable orifice device in which the area of the communicating portion of the eccentric holes of both orifices is made variable by interposing them in a coaxially stacked state ,
Provided with an operating part for rotating the movable orifice around the axis of the pipeline,
The operating portion is a rod-like member that is detachably inserted into a hole provided in the outer peripheral surface of the movable orifice,
A variable orifice device characterized in that the positions of the plurality of holes do not coincide with the positions of the bolt holes at the same time so that the bolts do not interfere when the rod-shaped member is used . The pipe line is flange-connected, and an O-ring is interposed between the two orifices and between the movable orifice and the flange on the side opposite to the movable orifice. Variable orifice device. 3. The variable orifice device according to claim 2, wherein the O-ring is interposed on the outer peripheral surface of the movable orifice.

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