JP5128304B2 - Pressure control device - Google Patents

Description

  The present invention relates to a pressure control device that controls the pressure of a fluid in a pipeline through which the fluid flows.

  If there is a pressure difference between the upstream side and the downstream side in the fluid flowing through the pipeline, if the fluid on the upstream side becomes turbulent, the pressure on the downstream side is not constant, and a phenomenon in which the pressure fluctuates may be observed. known. When the pressure fluctuation of the fluid occurs, there is a problem that it is difficult to perform control to cancel the pressure fluctuation in accordance with the cycle. In order to suppress this, a rectifier that rectifies the flow of fluid in a pipe line is known.

  FIG. 4 is a cross-sectional view of the rectifier 1 according to the prior art and the pressure control device 2 including the rectifier 1. The rectifier 1 according to the prior art is provided in the middle of the linear flow path, and equalizes the flow velocity.

JP 2001-175337 A

  The rectifier 1 according to the first prior art is arranged in the middle of the linear flow path and equalizes the flow velocity. However, if disturbance occurs in the fluid flow on the upstream side, the pressure fluctuation on the downstream side is suppressed. There is a problem that it can not be solved.

  The objective of this invention is providing a pressure control apparatus provided with the rectifier which can prevent the pressure fluctuation which generate | occur | produces downstream from a pressure control apparatus.

The present invention is a valve seat provided in a pipeline through which a fluid flows, partitioning the pipeline into an upstream pipeline and a downstream pipeline, and forming a through hole,
A valve seat that forms an angle between a through-hole axial direction that is a flow direction of fluid flowing through the through-hole and an upstream pipe axis direction that is a flow direction of fluid in the upstream-side pipe line;
A rectifier disposed upstream of the valve seat and rectifying the flow of fluid passing therethrough,
The rectifier has an axial line substantially parallel to the through-hole axial direction, and has a cylindrical guide portion formed in a cylindrical shape,
On the outer peripheral surface of the cylindrical guide portion, it consists of a plate-shaped guide portion that protrudes outward and is formed in a plate shape,
The plate-like guide part is composed of a plurality of ring-like plate-like bodies provided at intervals along the axis of the cylindrical guide part,
In the pressure control device, the interval between the plate-like bodies is set larger than the thickness of the plate-like body.

  According to the present invention, the flow direction of the fluid flowing through the upstream pipe line can be defined by the plate-shaped guide portion. Therefore, immediately after the flow direction is defined, the fluid flow path can be defined by the cylindrical guide portion, and the fluid can be guided to the through hole. Thereby, compared with the case where a rectifier is not provided, the area | region where a fluid becomes a turbulent flow in the position where a flow direction changes can be made small. Therefore, it is possible to prevent the pressure fluctuation from occurring in the fluid when passing through the through hole.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, parts corresponding to matters already described in the forms preceding each form may be denoted by the same reference numerals, and overlapping descriptions may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

<First Embodiment>
FIG. 1 is a cross-sectional view of a pressure control device 10 according to the first embodiment of the present invention. The pressure control device 10 according to the first embodiment controls the pressure of a fluid in a pipeline through which the fluid flows. The pressure control device 10 includes a valve seat 11. The valve seat 11 is provided in a pipeline through which fluid flows, partitions the pipeline into an upstream pipeline 12 and a downstream pipeline 13, and defines a through hole 14 having an inner diameter smaller than the inner diameter of the upstream pipeline 12. . The axis of the through hole 14 and the upstream tube axis form an angle. The axis of the through hole 14 is substantially parallel to the flow direction of the fluid flowing through the through hole 14, and the upstream pipe axis is substantially parallel to the flow direction of the fluid in the upstream side pipe 12. In the present embodiment, the angle formed by the through-hole axis direction and the upstream tube axis direction is about 90 degrees. The fluid is, for example, city gas, and the pipe is, for example, a gas pipe. However, the pressure control device 10 having the structure shown in FIG. 1 is only one embodiment of the pressure control device according to the present invention, and the present invention can be realized as a pressure control device having various structures. The structure shown in FIG. 1 does not limit the technical scope of the present invention.

  The pressure control device 10 further includes a piston 16 and a cylinder 17. The cylinder 17 is provided in a conduit through which fluid flows, and accommodates the piston 16 in the internal space. The pressure control device 10 includes a piston rod 19, an O-ring 21, a pipe line structure 22, a drive unit, and a control unit. The drive unit is a part that displaces the piston 16 in the sliding direction Z with respect to the cylinder 17. The control unit is a part that controls the drive unit when the secondary pressure rises or falls to keep the secondary pressure constant.

  The upstream pipeline 12 and the downstream pipeline 13 are included in the pipeline component 22. The cylinder 17 includes a cylinder disc 27 and a cylinder cylindrical portion 28. The cylinder disk 27 is a plate-like member having a circular outer shape in a cross section perpendicular to the axis, and an insertion hole 19a into which the piston rod 19 is inserted is formed. The insertion hole 19 a is a cylindrical hole that passes through the cylinder disk 27 and is formed with a straight line extending in the thickness direction of the plate member passing through the center of the outer circle. The piston rod 19 is formed in a columnar shape, and can slide smoothly with respect to a portion of the cylinder disc 27 that defines the insertion hole 19a. The axis of the cylindrical piston rod 19 coincides with the axis of the insertion hole 19a.

  In the first embodiment, the axis of the piston rod 19 is referred to as “sliding axis”, and the direction of the sliding axis is referred to as “sliding direction”. All directions of a straight line perpendicular to the sliding axis are referred to as “radial direction”, the direction away from the sliding axis in the radial direction is referred to as “radially outward”, and the direction closer to the sliding axis in the radial direction. Is referred to as “radially inward”.

  The cylinder cylindrical portion 28 is formed in a substantially cylindrical shape, and the axis of the cylinder cylindrical portion 28 coincides with the sliding axis. One end Z1 of the cylinder cylindrical portion 28 in the sliding direction is connected to the cylinder disk 27. The cylinder cylindrical portion 28 is formed integrally with the cylinder disc 27. A plurality of communication holes 32 are formed in the cylinder 17. The communication hole 32 communicates the internal space and the external space, and can be closed by the displacement of the piston 16. Specifically, a plurality of communication holes 32 penetrating in the radial direction are formed on the side surface of the cylinder cylindrical portion 28. The plurality of communication holes 32 are also formed in the circumferential direction around the sliding axis of the cylinder cylindrical portion 28 and are also formed in the sliding direction Z of the cylinder cylindrical portion 28. A portion that defines the communication hole 32 is referred to as a “communication hole defining portion”.

  The piston 16 is fitted to the cylinder cylindrical portion 28 and is installed radially inward of the cylinder cylindrical portion 28. The piston 16 is generally formed in a cylindrical shape, and the cylinder axis of the piston 16 coincides with the sliding axis. The outer diameter of the cylinder of the piston 16 is larger than the outer diameter of the cylinder of the piston rod 19. A protruding portion 16b that protrudes over the entire circumference in the sliding direction other Z2 is formed on the outer peripheral edge in the radial direction among the ends of the other sliding direction Z2 of the piston 16. The piston 16 is located in the other sliding direction Z2 than the piston rod 19, and the end of the other sliding direction Z2 of the piston rod 19 is connected to the end of the sliding direction one Z1 of the piston 16. The piston 16 together with the piston rod 19 is displaced in the sliding direction Z with respect to the cylinder 17.

  A rectangular groove 16a is formed on the outer peripheral surface of the piston 16 radially outward from the sliding axis. The rectangular groove 16a is formed over the entire circumference in the circumferential direction around the sliding axis. The position of the rectangular groove 16a in the sliding direction Z with respect to the piston 16 is constant regardless of the circumferential direction. The rectangular groove 16a is formed by cutting out a part of the piston 16 from the radially outer side with respect to the sliding axis, and the rectangular groove 16a has a rectangular cross-sectional shape when the piston 16 is cut along a plane including the sliding axis. is there.

  An O-ring 21 is fitted in the rectangular groove 16a. The O-ring 21 is made of synthetic rubber or synthetic resin, and is fitted to the cylinder cylindrical portion 28 from the inside in the radial direction of the cylinder cylindrical portion 28. The dimension in the radial direction of the O-ring 21 is uniform in the circumferential direction around the sliding axis, and is set larger than the radial depth of the rectangular groove 16a. The O-ring 21 projects slightly outward in the radial direction with respect to the sliding axis from the outer peripheral surface of the piston 16 in a state of being fitted in the rectangular groove 16a. The piston 16 is loosely fitted to the cylinder cylindrical portion 28 from the inside of the cylinder cylindrical portion 28. A lubricant is applied to the gap between the O-ring 21 and the inner peripheral surface of the cylinder cylindrical portion 28 in order to reduce friction between the O-ring 21 and the cylinder cylindrical portion 28.

  The pipe structure 22 includes an upstream flange 34, a downstream flange 36, and a partition wall 38, and is integrally formed. The pipe line structure 22 defines a region through which the fluid flows, and this fluid is, for example, city gas, and the direction in which the fluid flows in the first embodiment is predetermined. The upstream end portion of the pipeline structure 22 is connected to the upstream piping. The downstream end of the pipe line structure 22 is connected to the downstream pipe. The upstream flange 34 is a pipe joint that enables fixing and sealing with respect to the upstream pipe. The downstream flange 36 is a pipe joint for enabling fixation and sealing with respect to the downstream pipe.

  The partition wall 38 is installed at a midway position between the upstream side and the downstream side with respect to the flow direction of the fluid flowing through the internal space of the pipeline structure 22, and the partition wall 38 is provided by partitioning the upstream side and the downstream side. It is a part. Of the internal space partitioned by the partition wall 38, the fluid located upstream is referred to as “primary fluid”, and the fluid located downstream is referred to as “secondary fluid”. In the first embodiment, the pressure of the fluid in the upstream pipe is referred to as “primary pressure”, and the pressure of the fluid in the downstream pipe is referred to as “secondary pressure”. The primary pressure is predetermined and kept constant. The secondary pressure has a predetermined target pressure level, and the pressure control apparatus 10 according to the present embodiment performs pressure control in order to maintain the secondary pressure at the target pressure. The pressure determined as the target as the secondary pressure is referred to as “target secondary pressure”. The target secondary pressure is lower than the primary pressure and the secondary pressure never becomes higher than the primary pressure.

  A through hole 14 is formed in a part of the partition wall 38. The through hole 14 is a hole penetrating the partition wall 38 in the sliding direction Z, and communicates the upstream space where the primary fluid is located and the space downstream of the partition wall 38 where the secondary fluid is located. Of the space defined by the pipe structure 22, the space upstream of the partition wall 38 where the primary fluid is located is referred to as “upstream space”. A portion of the partition wall 38 that defines the through hole 14 is the valve seat 11. The valve seat 11 is a substantially circular annular portion when viewed in the sliding direction Z, and the thickness direction of the valve seat 11 coincides with the sliding direction Z. When the through hole 14 is viewed in the sliding direction Z, it is circular, and the center of the through hole 14 viewed in the sliding direction Z coincides with the sliding axis. In order to prevent the valve seat 11 from becoming a significant resistance to the flow of the fluid even when the flow rate of the fluid flowing through the pipeline structure 22 is the maximum within a predetermined range, the through hole 14 is provided. The inner diameter of is set sufficiently large.

  The inner diameter of the through hole 14 is set smaller than the inner diameter of the piston 16. Even when the flow rate of the fluid flowing through the pipe structure 22 is the maximum within a predetermined range, in the first embodiment, the fluid moves the through hole 14 from the other sliding direction Z2 to the other sliding direction Z1. Flowing. Therefore, the flow direction of the fluid in the through hole 14 coincides with the sliding direction one Z1.

  A space located on the other side in the sliding direction Z2 from the piston 16 and radially inward with respect to the sliding axis from the cylinder cylindrical portion 28 is referred to as a “piston space”. In the piston space 43, the fluid is prevented from moving in one sliding direction Z1 by the end surface of the other sliding direction Z2 of the piston 16. The through hole 14 of the partition wall 38 is formed sufficiently large to prevent the valve seat 11 from resisting the flow of fluid, so that the fluid pressure in the piston space 43 is the primary pressure. The piston 16 is displaced from the state where the piston 16 is located in the othermost sliding direction within the driving range of the piston 16 to the one side Z1 in the sliding direction, and the space defined by the communication hole 32 formed in the cylinder cylindrical portion 28 becomes the piston space 43. When connected, the fluid in the piston space 43 passes through the communication hole 32 radially outward with respect to the sliding axis.

  The communicating hole defining portion 33 exposed to the piston space 43 and the portion of the piston 16 that faces the communicating hole defining portion 33 act as a resistance against the flow of fluid. The pressure of the fluid moved radially outward from the portion 28 is lower than the primary pressure.

  In the present embodiment, the communication hole 32 is formed so as to extend over the entire range in the circumferential direction and the sliding direction Z of the cylinder cylindrical portion 28. The plurality of communication holes 32 formed in the cylinder cylindrical portion 28 are formed along a spiral line. The spiral line is a line that spirally rotates around the sliding axis in the circumferential direction of the cylinder cylindrical portion 28 as it goes in the sliding direction one Z1. At least a part of the position in the sliding direction Z of the adjacent communication hole 32 on the spiral line overlaps with the sliding direction Z. By forming the plurality of communication holes 32 in this way, when the piston 16 is displaced in the sliding direction Z, the amount of fluid passing through the cylinder cylindrical portion 28 is continuously increased as the piston 16 is displaced. Can be changed.

  FIG. 2 is a cross-sectional view of the rectifier 44 according to the first embodiment of the present invention cut along a plane including the sliding axis. The pressure control device 10 according to the first embodiment is configured to further include a rectifier 44. The rectifier 44 is disposed on the upstream side of the valve seat 11 and includes a plate-like guide portion 46 and a cylindrical guide portion 48. The plate-like guide portion 46 is a plate-like portion provided substantially in parallel with the upstream tube axis direction, and the cylindrical guide portion 48 is provided in the plate-like guide portion 46 and allows fluid upstream of the through hole 14 to flow. Guide downstream. The cylindrical guide portion 48 is formed in a cylindrical shape having an axis substantially parallel to the through-hole axis direction, and the plate-like guide portion 46 is provided on the outer peripheral surface of the cylindrical guide portion 48 so as to protrude outward. , Composed of a plurality of parallel plates.

  The plate-like guide part 46 and the cylindrical guide part 48 are formed of aluminum or an aluminum alloy, and the plate-like guide part 46 and the cylindrical guide part 48 are integrally formed. The plate-like guide portion 46 is formed from a ring-shaped portion 49 that is formed in a plurality apart from each other in the sliding direction. The plurality of ring-shaped portions 49 are installed at equal intervals in the sliding direction, with the sliding direction being the thickness direction. In the present embodiment, the plurality of ring-shaped portions 49 are arranged three apart in the sliding direction. Among the ring-shaped portions 49, the interval between the ring-shaped portion 49 located in the most sliding direction Z1 and the partition wall 38 and the gap between the ring-shaped portions 49 are set to be equal intervals. The outer diameter when the ring-shaped portion 49 is viewed in the sliding direction is set smaller than the inner diameter of the through hole 14 of the partition wall 38.

  Although the thickness of the ring-shaped portion 49 is not specified, the interval in the sliding direction between the plurality of ring-shaped portions 49 is set larger than the thickness of each ring-shaped portion 49. The ring-shaped part 49 is formed without contacting the upstream side pipe line 12 that defines the flow path of the primary fluid in the pipe line structure 22. The center of the circle formed by the outer shape when the ring-shaped portion 49 is viewed in the sliding direction is set to coincide with the sliding axis. The inner side when the ring-shaped portion 49 is viewed in the sliding direction is continuous with the cylindrical guide portion 48 over the entire circumferential direction around the sliding axis.

  The second member is arranged with the sliding axis as the axis of the cylinder, and the outer shape of the cylinder is set smaller than the inner diameter of the through hole 14 of the partition wall 38. A flange portion 51 is formed at the end of one side Z1 in the sliding direction of the cylindrical guide portion 48 so as to protrude outward in the radial direction with respect to the sliding axis. The outer diameter of the flange portion 51 is set larger than the inner diameter of the through hole 14 and larger than the outer diameter of the plate-like guide portion 46. A sealing portion 51a made of synthetic rubber or synthetic resin is formed over the entire circumference in a portion corresponding to the protruding portion 16b of the piston 16 in the surface portion of the one Z1 in the sliding direction of the flange portion 51. When the piston 16 is displaced most in the other sliding direction Z2, the protruding portion 16b of the piston 16 abuts on the sealing portion 51a. As a result, the through hole 14 is closed and fluid movement is prevented. The flange portion 51 is disposed in contact with the valve seat 11 of the partition wall 38 from one side Z1 in the sliding direction. The cylindrical portion of the cylindrical guide portion 48 excluding the flange portion 51 and the plate-like guide portion 46 are arranged in the radial direction inside of the through hole 14 and in the other sliding direction Z2 than the through hole 14.

  The flange portion 51 and the valve seat 11 are fixed to each other by a screw member such as a screw. The screw member has an axis in the sliding direction, and is screwed into the valve seat 11 from the sliding direction Z1 with the head portion facing the sliding direction Z1 and the shaft portion facing the other sliding direction Z2. Thereby, the rectifier 44 is fixed with respect to the pipe line structure 22. Of the plate-like guide portion 46, the ring-like portion 49 located in the other side Z <b> 2 in the most sliding direction is formed in a flange shape with respect to the tubular guide portion 48. Although the cylindrical guide portion 48 is disposed in contact with the partition wall 38, it is formed away from the upstream piping that defines the fluid flow path upstream of the partition wall 38. In a state in which the rectifier 44 is fixed to the partition wall 38 of the pipe structure 22, the interval between the partition portion 38 and the ring-shaped portion 49 closest to the Z 1 side in the sliding direction among the plate-shaped guide portions 46 is set to a plurality of intervals. It is set equal to the interval between the ring-shaped portions 49.

  The fluid that has entered the pipeline structure 22 from the upstream pipe is rectified by the flat plate member formed in the upstream pipeline 12 and reaches the vicinity of the cylindrical guide portion 48. The fluid enters the radially inner space of the cylindrical guide portion 48 from the other sliding direction Z2 of the cylindrical guide portion 48. Even if turbulent flow is generated in the vicinity of the plate-shaped guide portion 46 and the cylindrical guide portion 48 in the radially outward direction and the sliding direction other Z2 than the cylindrical guide portion 48, a plurality of fluid molecules move by the turbulent flow. The range of movement is limited by the ring-shaped portion 49, and movement in a range larger than the distance between the ring-shaped portions 49 is prevented. In addition, even when turbulent flow occurs radially outward from the cylindrical guide portion 48, the plate-shaped guide portion 46 is arranged to reduce the range of the turbulent region.

  After the fluid moves through the gap between the plate-like guide portion 46 and the upstream pipeline 12 and the gap between the cylindrical guide portion 48 and the upstream pipeline 12, from the other sliding direction Z2 of the second pipeline, Move to the space inside the second pipe. The fluid that has entered the space radially inward of the cylindrical guide portion 48 reaches the piston space 43, passes through the communication hole 32 formed in the cylinder cylindrical portion 28, and moves downstream from the cylinder cylindrical portion 28. To do.

  If the rectifier 44 in the present embodiment is not installed, the fluid vortex in the region where the turbulent flow is generated in the upstream pipe 12 is not subjected to a spatial restriction, and therefore, the complex spreading in the upstream pipe 12 is complicated. It becomes a vortex. In other words, when the rectifier 44 in the present embodiment is not installed, the distance that the plurality of fluid molecules move in a plurality of directions while rubbing each other is larger than when the rectifier 44 is installed. As a result, a pressure difference may occur in the fluid pressure depending on the position in the upstream pipe 12. In other words, fluid sparseness is caused by turbulent vortices. When a pressure difference occurs depending on the position and fluid density occurs, the fluid moves in a direction that eliminates the pressure difference, and this fluid movement causes another pressure difference depending on the position. By repeating this, the pressure fluctuation of the fluid occurs in the upstream side pipe 12.

  When a large fluid vortex is generated in the upstream pipe 12, the period of the pressure fluctuation generated in the upstream pipe 12 is not constant but shows a random behavior. This pressure fluctuation may be transmitted to the downstream side without disappearing even if it passes through the through hole 14 and the communication hole 32 of the cylinder cylindrical portion 28. As a result, the secondary pressure varies. The secondary pressure is preferably constant, and it is difficult to cancel out the randomly generated pressure fluctuation by controlling the secondary pressure. In particular, the higher the target secondary pressure is relative to the primary pressure, the more easily the pressure difference depending on the position in the upstream pipe causes a pressure fluctuation on the downstream side of the cylinder 17, and the amplitude of the pressure fluctuation. Becomes larger.

  By installing the rectifier 44, a region where turbulent flow is generated in the upstream pipe line 12 can be reduced. Even if turbulent flow occurs, vortices associated with turbulent flow can be reduced. Thereby, it is possible to suppress the occurrence of a pressure difference depending on the position. Therefore, it is possible to prevent pressure fluctuations from occurring in the fluid, and it is possible to prevent secondary pressures from fluctuating.

  If the plate-shaped guide portion 46 is not installed and only the cylindrical guide portion 48 is installed, the occurrence of turbulent fluid flow cannot be suppressed in the upstream side pipe 12, and pressure fluctuations in the downstream side pipe are prevented. The occurrence of was observed. Therefore, the pressure fluctuation cannot be prevented by the arrangement of only the cylindrical guide portion 48.

  According to the first embodiment, the pressure control device 10 includes the valve seat 11 and the rectifier 44. The valve seat 11 is provided in a pipeline through which fluid flows, partitions the pipeline into an upstream pipeline 12 and a downstream pipeline 13, and defines a through hole 14 having an inner diameter smaller than the inner diameter of the upstream pipeline 12. . The through hole axial direction and the upstream pipe axial direction form an angle. The through hole axial direction is the flow direction of the fluid flowing through the through hole 14, and the upstream pipe axis direction is the flow direction of the fluid in the upstream pipe line 12. The rectifier 44 is disposed on the upstream side of the valve seat 11 and includes a plate-like guide portion 46 and a cylindrical guide portion 48. The plate-like guide portion 46 is a plate-like portion provided substantially in parallel with the upstream tube axis direction, and the cylindrical guide portion 48 is provided in the plate-like guide portion 46 and allows fluid upstream of the through hole 14 to flow. Guide downstream.

  As a result, the flow direction of the fluid flowing through the upstream pipeline 12 can be defined by the plate-shaped guide portion 46. Therefore, immediately after the flow direction is defined, the fluid flow path can be defined by the cylindrical guide portion 48, and the fluid can be guided to the through hole 14. Thereby, compared with the case where the rectifier 44 is not provided, the region where the fluid becomes turbulent at the position where the flow direction changes can be reduced. Therefore, it is possible to prevent the pressure fluctuation from occurring in the fluid when passing through the through hole 14.

  The pressure fluctuation of the secondary pressure in the downstream pipe 13 and the downstream pipe is suppressed or prevented when the vortex generated in the fluid in the upstream pipe 12 is small and small, and the cross-sectional area of the upstream pipe 12 is constant. It is known that the vortex generated in the fluid in the upstream pipe 12 is smaller and less likely to be smaller. When designing the pressure control device 10, it is often designed on the assumption that the cross-sectional area of the upstream pipe 12 is constant. However, when the rectifier 44 in this embodiment is installed, the upstream pipe Even if the cross-sectional area of 12 changes in the vicinity of the valve seat 11, it is possible to suppress the occurrence of turbulent fluid flow in the upstream pipe 12. For example, when the pressure control device 10 is designed, the cross-sectional area of the upstream pipe 12 can be set freely. Therefore, the pressure control apparatus 10 in which the rectifier 44 according to the present embodiment is installed can increase the degree of design freedom.

  Further, according to the first embodiment, the cylindrical guide portion 48 is formed in a cylindrical shape having an axis substantially parallel to the through hole axial direction, and the plate-like guide portion 46 is formed on the outer peripheral surface of the cylindrical guide portion 48. A plurality of plate-like bodies are provided so as to protrude outward and are parallel to each other. As a result, the fluid flow can be rectified outside the outer peripheral surface of the cylindrical guide portion 48. Therefore, the turbulent vortex generated in the fluid can be reduced and reduced. Since it is not necessary to limit the opening area of the through hole 14, the pressure loss can be reduced.

  In another embodiment, the number of ring-shaped portions 49 forming the plate-like guide portion 46 may not be three. For example, it may be two, four or more, or five or more. The number of ring-shaped portions 49 formed away from each other in the sliding direction Z is not defined. In yet another embodiment, instead of forming a plurality of ring-shaped portions 49 outside the outer peripheral surface of the cylindrical guide portion 48, a recess formed on the outer peripheral surface of the cylindrical member extending in the circumferential direction. May be formed at a plurality of different positions in the sliding direction Z.

  FIG. 3 is a cross-sectional view of the rectifier 44 according to the second embodiment of the present invention cut along a plane including the sliding axis. The pressure control device 10 according to the second embodiment is similar to the pressure control device 10 according to the first embodiment, and hereinafter, description will be made focusing on differences between the second embodiment and the first embodiment. In the second embodiment, the outer shape of the cylindrical guide portion 48 is formed in a cylindrical shape extending with the sliding direction Z as an axis, and the inner peripheral surface of the end of the other sliding direction Z2 of the cylindrical guide portion 48 is slid. It is formed to spread outward as it goes in the other direction Z2.

  The inner peripheral surface of the cylindrical guide portion 48 is formed in a so-called trumpet shape at the end of the other sliding direction Z2 and in the vicinity thereof. As a result, the inner peripheral surface of the cylindrical guide portion 48 is moved inwardly in the radial direction of the cylindrical guide portion 48 from the other sliding direction Z2 rather than the cylindrical guide portion 48, compared to the case where the cylindrical guide portion 48 is formed in a cylindrical shape. Accordingly, separation of the flow on the rectifier surface can be suppressed. Therefore, the flow direction of the fluid moving inwardly in the radial direction of the cylindrical guide portion 48 from the other sliding direction Z2 to the cylindrical guide portion 48 can be changed smoothly.

  In the first and second embodiments, the flange portion 51 and the partition wall 38 of one side Z1 in the sliding direction of the cylindrical guide portion 48 are in contact with each other and fixed to each other. However, in other embodiments, the cylindrical guide portion A damper made of a resin having rubber elasticity may be disposed between the flange portion 51 of the one side Z1 in the sliding direction of the portion 48 and the partition wall 38. The damper suppresses relative displacement between the flange portion 51 and the valve seat 11 of the partition wall 38, and suppresses vibration of the cylindrical guide portion 48 relative to the partition wall 38. Thereby, it can suppress by absorbing the pressure fluctuation of a fluid, and it can prevent that the pressure fluctuation of the fluid in the upstream pipe line 12 is transmitted downstream.

  In the first and second embodiments, the rectifier 44 is formed of aluminum or an aluminum alloy, and the plate-like guide portion 46 and the cylindrical guide portion 48 are integrally formed. The rectifier 44 may be formed of resin. Further, the ring-shaped portion 49 and the cylindrical guide portion 48 may be formed separately from each other and then connected.

  In the first and second embodiments, the reference direction coincides with the sliding direction Z and one reference direction coincides with the sliding direction one Z1, but the reference direction and the sliding direction Z may be independent. . For example, in another embodiment, the reference direction may be configured to form an angle with respect to the sliding direction, or the reference direction and the sliding direction match, and the reference direction one and the sliding direction other Z2 match. It is good.

  In the first and second embodiments, the space in the cylindrical guide portion 48 has a virtual cylindrical shape having an axis in the sliding direction. In still another embodiment, the space inside the cylindrical guide portion 48 In the space, blades extending in the sliding direction for rectifying the fluid passing through the inner space in the sliding direction may be formed.

It is sectional drawing of the pressure control apparatus 10 which concerns on 1st Embodiment of this invention. It is sectional drawing which cut | disconnected the rectifier 44 in 1st Embodiment of this invention, and cut | disconnected it by the plane containing a sliding axis. It is sectional drawing which cut | disconnected the rectifier 44 in 2nd Embodiment of this invention, and cut | disconnected it by the plane containing a sliding axis. It is sectional drawing of the rectifier 1 which concerns on a prior art, and the pressure control apparatus 2 accompanying this.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pressure control apparatus 11 Valve seat 12 Upstream side pipe line 13 Downstream side pipe line 14 Through-hole 16 Piston 17 Cylinder 22 Pipeline structure 32 Communication hole 33 Communication hole definition part 38 Bulkhead 42 Valve seat 43 Piston space 44 Rectifier 46 Plate shape Guide part 48 Tubular guide part 49 Ring-shaped part 51 Flange part

Claims (1)

A valve seat provided in a pipeline through which fluid flows, dividing the pipeline into an upstream pipeline and a downstream pipeline, and having a through hole;
A valve seat that forms an angle between a through-hole axial direction that is a flow direction of fluid flowing through the through-hole and an upstream pipe axis direction that is a flow direction of fluid in the upstream-side pipe line;
Is disposed on the upstream side of the valve seat, viewed contains a rectifier for rectifying the flow of fluid through,
The rectifier has an axial line substantially parallel to the through-hole axial direction, and has a cylindrical guide portion formed in a cylindrical shape,
On the outer peripheral surface of the cylindrical guide portion, it consists of a plate-shaped guide portion that protrudes outward and is formed in a plate shape,
The plate-like guide part is composed of a plurality of ring-like plate-like bodies provided at intervals along the axis of the cylindrical guide part,
The pressure control device according to claim 1, wherein the interval between the plate-like bodies is set to be larger than the thickness of the plate-like body .

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