JP2017040314A - Secondary side rectifier of pilot type governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary rectifier of a pilot type governor having high rectification effect.SOLUTION: A diffusion strainer 1 is provided on a secondary side of a pilot type governor 5, a swirl flow removal plate 2 on a downstream side with respect to the diffusion strainer, and a drift removal plate 3 on a downstream side of the swirl flow removal plate. Fluid passing through the pilot type governor 5 is diffused by the diffusion strainer 1, and flows evenly over a wide range of the surface of the swirl flow removal plate 2 to remove a swirl flow. After that, the fluid flows evenly over a wide range of the surface of the drift removal plate 3 to remove a drift.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an apparatus for adjusting a fluid flow on a secondary side of a pilot governor.

Conventionally, a pilot type governor that is provided in a flow path through which a fluid such as a gas flows and adjusts a secondary side pressure to a set pressure is known. The pilot type governor includes a main governor that allows fluid to flow from the primary side to the secondary side, and a pilot governor that adjusts a control pressure that changes the opening of the main governor according to the sensed secondary side pressure. Transmission of the secondary pressure to the pilot type governor is performed via a pressure regulating pipe having one end connected to the secondary pipe.
In order to stabilize the operation of the pilot type governor, it is necessary to connect the pressure regulating pipe to the secondary pipe at a position where the fluid flow is stable. For this reason, when the inner diameter of the pipe is D, the pressure regulating pipe is connected to the pipe at a position separated by 5D or more. FIG. 8 is a diagram schematically showing an installation state of the pressure regulating pipe 6a with respect to the pilot type governor 5a. However, if the connection position between the pressure regulating pipe 6a and the secondary side pipe is separated from the pilot type governor 5a in this way, the pressure regulating pipe 6a may be damaged during some other construction. In addition, when switching to a pilot type governor, etc., careful caution was required to connect at a position 5D or more away, and the workability was poor.

  Thus, for example, Patent Document 1 describes a pressure control device in which a reducer is connected to the outlet of the main governor and a rectifying plate is provided on the downstream side of the reducer. By doing so, the secondary pressure can be taken out at a position close to the downstream side of the main governor.

Japanese Patent Laid-Open No. 6-138952

However, in the configuration described in Patent Document 1, it is difficult to flow the fluid uniformly over a wide range of the surface of the rectifying plate, and it is easy for the fluid to flow in the vicinity of the central portion of the rectifying plate. Such an event becomes particularly remarkable as the flow rate increases, and the fluid flows more intensively in the central portion. Thus, if the fluid flows biased to a part of the surface of the rectifying plate, the rectifying effect by the rectifying plate cannot be sufficiently obtained.
In addition, with the single rectifying plate as in Patent Document 1, the rectifying effect that can be obtained is limited in the first place.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a secondary side rectifier of a pilot type governor having a high rectification effect.

  A secondary side rectifier of a pilot type governor according to the present invention is a diffusion strainer that is hollow and has a plurality of holes on a side surface thereof, and allows a fluid flowing inward to flow outside through the plurality of holes, and a diffusion strainer A swirl flow removing plate that is provided on the downstream side and removes the swirling flow of the fluid that has flowed out of the diffusion strainer with a plurality of holes, and a swirl flow plate that is provided on the downstream side of the swirl flow removal plate and has a plurality of holes. And a drift removing plate for removing the drift of the fluid that has passed through the flow removing plate.

  According to this invention, since the diffusion strainer, the swirl flow removing plate on the downstream side, and the drift removing plate on the downstream side thereof are provided, a high rectifying effect can be obtained.

It is a side view which shows the secondary side rectifier of the pilot type governor which concerns on Embodiment 1 of this invention. It is the side view and sectional drawing of a diffusion strainer. It is a top view of a swirl flow removal plate. It is a top view of a drift removal board. It is sectional drawing of a swirl flow removal plate and a drift removal plate. It is a figure which shows roughly the installation condition of the pressure regulation pipe | tube at the time of using the secondary side rectifier of the pilot type governor which concerns on Embodiment 1 of this invention. It is a side view which shows the modification of a diffusion strainer. It is a figure which shows roughly the installation condition of the conventional pressure regulation pipe | tube.

Embodiment 1 FIG.
FIG. 1 shows a secondary side rectifier of a pilot governor according to Embodiment 1 of the present invention. This secondary side rectifier has a diffusion strainer 1, a swirl flow removing plate 2, and a drift removing plate 3, which are housed in a pipe 4. Inside the pipe 4, a fluid such as a gas flows in the direction A in FIG. A pilot type governor (not shown) is provided upstream of the pipe 4, that is, above the paper surface, and a secondary fluid whose flow rate is controlled by the pilot type governor flows into the secondary pipe 4. Further, the pressure regulating pipe 6 is connected to the pipe 4 at a position downstream of the drift removing plate 3.

  The diffusion strainer 1 is provided on the inlet side of the pipe 4. 2A shows a side view of the diffusion strainer 1, and FIG. 2B shows a cross-sectional view when the diffusion strainer 1 is cut along the line BB in FIG. 2A. The diffusion strainer 1 has a bottomed and substantially cylindrical shape, and an upper surface 11 facing the closed bottom surface 10 is open. Further, the diffusion strainer 1 has a plurality of holes 12 regularly arranged on the side surface thereof. Among the end portions of the diffusion strainer 1, the end portion on the upper surface 11 side is fixed to the end portion of the pipe portion 40 shown in FIG. 1 by welding or the like, and the fluid flowing into the pipe 4 continuously flows inside the diffusion strainer 1. Flow into. The fluid that has flowed into the diffusion strainer 1 flows out from the inside to the outside of the diffusion strainer 1 through the plurality of holes 12. By passing through the plurality of holes 12 formed on the side surface, the fluid is diffused and flows out.

The swirl flow removing plate 2 is provided on the downstream side of the diffusion strainer 1. FIG. 3 shows a plan view of the swirl flow removing plate 2. The swirl flow removing plate 2 is a disk-shaped plate member having a plurality of holes 20 and removes a rotation component around an axis parallel to the flow direction through the plurality of holes 20 to remove a swirl flow of fluid. The plurality of holes 20 shown in the figure are holes of the same diameter that are regularly arranged at equal intervals. The thickness of the swirling flow removing plate 2, the arrangement of the plurality of holes 20, the hole diameter, the hole pitch, and the like are appropriately determined using a well-known theory so that the swirling flow of the fluid flowing through the pipe 4 can be removed and illustrated. Not limited to examples.
The swirl flow removing plate 2 is welded and fixed to the inner wall of the pipe 4 using the peripheral edge 21 thereof.

The drift removal plate 3 is provided on the downstream side of the swirl flow removal plate 2. FIG. 4 shows a plan view of the drift removal plate 3. The drift removal plate 3 is a disk-shaped plate member having a plurality of holes 30 and eliminates the deviation of the velocity distribution by passing through the plurality of holes 30 to remove the fluid drift. The plurality of holes 30 shown in the figure are holes of the same diameter arranged on a concentric circle. These concentric circles are indicated by a one-dot chain line in FIG. And each opening ratio in the annular part pinched by two adjacent concentric circles is so low that it is in the annular part located outside from the center of the drift removal board 3. Further, the number of the plurality of holes 30 is smaller than that of the plurality of holes 20. The thickness of the drift removing plate 3, the arrangement of the plurality of holes 30, the hole diameter, the hole pitch, and the like are appropriately determined using a known theory so that the drift of the fluid flowing through the pipe 4 can be removed. Not exclusively.
The drift removing plate 3 is welded and fixed to the inner wall of the pipe 4 using the peripheral edge 31 thereof.

  FIG. 5 is a cross-sectional view showing the swirl flow removing plate 2 and the drift removing plate 3 installed in the pipe 4. The swirl flow removing plate 2 is thicker than the drift removing plate 3, and the diameters of the plurality of holes 20 are larger than those of the plurality of holes 30. The swirl flow removal plate 2 and the drift flow removal plate 3 are provided away from the inner diameter D of the pipe 4 by, for example, about 0.5D to 1D.

FIG. 6 is a diagram schematically showing the installation state of the pressure regulating pipe 6 when the pilot-type governor secondary side rectifier according to Embodiment 1 of the present invention is used for the pilot-type governor 5. .
The pilot type governor 5 is provided in the fluid flow path as is well known, and allows the fluid to flow from the primary side to the secondary side by the main governor. The opening degree of the main governor varies depending on the control pressure supplied by the pilot governor constituting the pilot governor 5. The pilot governor adjusts the flow rate of the fluid branched from the primary side of the main governor and supplies it to the main governor as a control pressure. At that time, the pilot governor senses the secondary side pressure of the pilot type governor 5 by the pressure regulating pipe 6 and changes the opening degree according to the sensed secondary side pressure to change the control pressure.

  The secondary side rectifier having the diffusion strainer 1, the swirl flow removing plate 2, and the drift removing plate 3 is provided on the secondary side of the pilot type governor 5, and the pilot type governor 5 is moved from the primary side to the secondary side. The fluid that has passed through flows into the diffusion upper surface 11 of the diffusion strainer 1 into the inside thereof. As shown in FIG. 2, since the bottom surface 10 of the diffusion strainer 1 is closed, the fluid that has flowed into the diffusion strainer 1 flows from the inside of the diffusion strainer 1 through the plurality of holes 12 provided on the side surface. It flows out to the outside. Thus, by flowing out from the plurality of holes 12 provided on the side surface, the fluid is diffused, and the fluid flows uniformly over a wide range of the surface of the swirl flow removing plate 2. This diffusion effect by the diffusion strainer 1 functions in the same way even when the flow rate is large, and suppresses the flow of fluid intensively in the center of the surface of the swirl flow removing plate 2.

The fluid diffused by the diffusion strainer 1 then passes through the swirl flow removing plate 2 so that the swirl flow is removed.
Thereafter, the fluid passes through the drift removing plate 3. First, the fluid diffused by the diffusion strainer 1 upstream of the swirling flow removing plate 2 is also spread over a wide area of the surface of the drift removing plate 3. After flowing evenly and passing the drift removal plate 3, the drift is removed.

  By passing through the diffusion strainer 1, the swirl flow removing plate 2, and the drift removing plate 3 as described above, the flow of the fluid is sufficiently adjusted and separated from the drift removing plate 3 by at least the inner diameter D of the pipe 4 on the secondary side. It becomes possible to connect the pressure regulating pipe 6 at the position. Even considering that the swirl flow removal plate 2 and the drift flow removal plate 3 are set apart from each other by about 0.5D to 1D, the connecting position of the pressure regulating tube 6 and the secondary side is more than that shown in FIG. The pilot type governor 5 can be approached.

  Note that the diffusion strainer 1 is not limited to the shape illustrated in FIG. 2, and may have a shape as illustrated in FIG. 7, for example. FIG. 7 shows a diffusion strainer 1 having a flask shape and having a plurality of holes 12 on the side surface. In short, the diffusion strainer 1 may be anything that is hollow and has a plurality of holes 12 on the side surface and allows the fluid flowing inward to flow out to the outside through the plurality of holes 12.

  Further, the use of welding as a fixing method for the swirl flow removing plate 2 and the drift removing plate 3 is advantageous in terms of cost and prevention of fluid leakage, but a fixing method using a flange may be employed. In this case, the swirl flow removing plate 2 having a flange 21 extending further toward the outer periphery as a flange is provided at one end, and the drift removing plate 3 having a flange 31 extending further toward the outer periphery as a flange at the other end. Prepare the piping you have. Then, the pipe is flange-connected in the middle of the pipe 4 and installed so as to constitute a continuous secondary pipe together with the pipe 4.

  As described above, according to the first embodiment of the present invention, the fluid flows evenly over a wide range of both the swirl flow removing plate 2 and the drift removing plate 3 by diffusing the fluid by the diffusion strainer 1. High rectification effect can be obtained. Thereby, the connection position of the pressure regulating pipe 6 and the secondary side can be brought close to the pilot type governor 5, and the installation, maintenance and management of the pressure regulating pipe 6 are facilitated.

  Further, in the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Diffusion strainer 2 Swirling flow removal plate 3 Diffusion flow removal plate 4 Piping 5 Pilot type governor 6 Pressure regulating tube 10 Bottom surface 11 Upper surface 12 Hole 20 Hole 21 Peripheral part 30 Hole 31 Peripheral part 40 Pipe part

Claims (1)

A diffusion strainer that is hollow and has a plurality of holes on the side surface, and causes the fluid flowing inward to flow out to the outside through the plurality of holes;
A swirl flow removing plate provided on the downstream side of the diffusion strainer and having a plurality of holes to remove the swirling flow of the fluid flowing out of the diffusion strainer;
A secondary of the pilot type governor, comprising a drift removing plate provided downstream of the swirling flow removing plate and having a plurality of holes for removing the drift of the fluid that has passed through the swirling flow removing plate. Side rectifier.

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