阅读说明：本技术 适用于弯管后端流体流速分布调整的流动调整器 (Flow regulator suitable for regulating fluid flow velocity distribution at rear end of bent pipe ) 是由 王德忠 黄松 尹俊连 宋煜 于 2020-07-09 设计创作，主要内容包括：本发明提供了一种适用于弯管后端流体流速分布调整的流动调整器,包括圆管、栅格调整架,所述栅格调整架设置在圆管内部,栅格调整架的长度方向沿着圆管的轴向方向,所述栅格调整架将圆管内部分隔成多个通道；所述栅格调整架将圆管的横截面分成第一区域、第二区域,所述第一区域内通道数量和密集程度均大于第二区域内通道的数量和密集程度,第一区域内通道的尺寸小于第二区域内通道的尺寸；所述第一区域安装在弯管弯曲外侧,第二区域安装在弯管弯曲内侧。本发明结构简单合理,通过非对称通道对流过弯管的流体进行流场调整,使得流体流动变得均匀,能够消除弯管所产生的非均匀来流对泵或阀门的影响,延长设备的使用寿命。(The invention provides a flow regulator suitable for regulating the flow velocity distribution of fluid at the rear end of a bent pipe, which comprises a circular pipe and a grid regulating frame, wherein the grid regulating frame is arranged inside the circular pipe, the length direction of the grid regulating frame is along the axial direction of the circular pipe, and the grid regulating frame divides the inner part of the circular pipe into a plurality of channels; the cross section of the circular tube is divided into a first area and a second area by the grid adjusting frame, the number and the density of the channels in the first area are both larger than those in the second area, and the size of the channels in the first area is smaller than that in the second area; the first region is mounted outside the bend of the elbow and the second region is mounted inside the bend of the elbow. The invention has simple and reasonable structure, and can adjust the flow field of the fluid flowing through the elbow pipe through the asymmetric channel, so that the fluid flow becomes uniform, the influence of the non-uniform inflow generated by the elbow pipe on a pump or a valve can be eliminated, and the service life of the equipment is prolonged.)

1. A flow regulator suitable for regulating the flow velocity distribution of fluid at the rear end of a bent pipe is characterized by comprising a round pipe and a grid regulating frame, wherein the grid regulating frame is arranged inside the round pipe, the length direction of the grid regulating frame is along the axial direction of the round pipe, and the grid regulating frame divides the inner part of the round pipe into a plurality of channels;

the cross section of the circular tube is divided into a first area and a second area by the grid adjusting frame, the number and the density of the channels in the first area are both larger than those in the second area, and the size of the channels in the first area is smaller than that in the second area;

the first region is mounted outside the bend of the elbow and the second region is mounted inside the bend of the elbow.

2. The flow conditioner for pipe bend rear end fluid flow velocity distribution adjustment according to claim 1, wherein the first region and the second region have a diameter of a circular pipe as a boundary.

3. A flow conditioner for the regulation of the flow velocity profile of a fluid at the rear end of an elbow according to claim 1, wherein said grid conditioning frame comprises parallel plates, a plurality of said parallel plates being staggered transversely and longitudinally to form a plurality of channels, said parallel plates being parallel to the central axis of the tube.

4. A flow conditioner adapted for elbow rear end fluid flow velocity distribution conditioning according to claim 1 or 3, wherein said grid conditioning frame further comprises one or more inclined plates located at the intersection of the first and second regions and inclined from the first region to the second region.

5. The flow conditioner for the adjustment of the fluid velocity profile at the rear end of an elbow of claim 4, wherein the angle between the inclined plate and the central axis of the barrel is 1-10 degrees.

6. The flow conditioner for elbow back end fluid flow velocity distribution adjustment according to claim 1, wherein the grid adjustment frame further comprises a swirl plate disposed in the second region near the center of the pipe, the swirl plate being perpendicular to the line of demarcation between the first region and the second region.

7. The flow conditioner for elbow back end fluid flow velocity distribution adjustment according to claim 4, wherein the grid adjustment frame further comprises a swirl plate disposed in the second region near the center of the pipe, the swirl plate being perpendicular to the line of demarcation between the first region and the second region.

8. A flow conditioner adapted for elbow aft end fluid flow velocity distribution conditioning according to claim 1 wherein said passage is circular or polygonal in cross-section.

9. The flow conditioner for elbow rear end fluid flow velocity profile conditioning according to claim 1, wherein the length of the round tube is at least 1.6 times the diameter of the round tube.

10. The flow conditioner for the adjustment of the flow velocity distribution of a fluid at the rear end of an elbow pipe according to claim 1, wherein the circular tube is provided with a connecting flange at both ends.

Technical Field

The invention relates to a flow rectifier, in particular to a flow regulator suitable for regulating the flow velocity distribution of fluid at the rear end of an elbow, and particularly relates to a flow regulator for regulating the flow velocity distribution of fluid after 90-degree elbow.

Background

A flow conditioner is a device that eliminates abnormal flow and shortens the necessary length of straight pipe segments. In today's production activities, where a pump is essential as a fluid delivery device, the operating conditions of the pump are greatly influenced by the inlet flow. Because of the existence of the elbows in a plurality of pipelines, when fluid flows through the elbows, speed distribution distortion, rotational flow and unsteady flow can be generated, which inevitably causes the non-uniformity of the flow at the inlet of the pump at the downstream of the elbows, and the non-uniformity can generate very large asymmetric impact force, so that the impeller of the pump is impacted by the non-uniform force, the pressure pulsation in the pump is increased, and the pump is vibrated more greatly. This non-uniform flow can also have a damaging impact on the elbow if other resistance elements, such as valves, are present behind it, thereby affecting its life.

Currently, ISO5167 recommends several forms of flow regulators, but these flow regulators have a good flow regulating effect on straight pipes and are not ideal for curved pipes.

Patent document CN203363522U discloses a honeycomb fluid regulator, comprising: the perforated plate and with the installation department that the perforated plate edge borders on, be equipped with the several hole on the perforated plate, the several hole is in be honeycomb formula distribution on the perforated plate, the installation department is used for installing this honeycomb formula fluid regulator in the pipeline. The utility model discloses honeycomb formula fluid regulator, the hole on the perforated plate is honeycomb formula and distributes, and the first hole at perforated plate middle part is regular hexagon, and sturdy structure, and can have sufficient cross section to let the fluid pass through, effectively reduces the pressure loss, eliminates unusual flow, shortens the length and the noise reduction of necessary straight tube. However, the technical solution disclosed in this patent document is suitable for adjusting the distribution of fluid flow velocity in a straight pipe, and the effect of adjusting the fluid flow velocity in a bent pipe, especially the rear end of the bent pipe, is not as good as the effect of adjusting the straight pipe.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a flow regulator suitable for regulating the flow velocity distribution of fluid at the rear end of a bent pipe.

The flow regulator comprises a circular pipe and a grid regulating frame, wherein the grid regulating frame is arranged inside the circular pipe, the length direction of the grid regulating frame is along the axial direction of the circular pipe, and the grid regulating frame divides the inner part of the circular pipe into a plurality of channels;

the cross section of the circular tube is divided into a first area and a second area by the grid adjusting frame, the number and the density of the channels in the first area are both larger than those in the second area, and the size of the channels in the first area is smaller than that in the second area;

the first region is mounted outside the bend of the elbow and the second region is mounted inside the bend of the elbow.

Preferably, the first region and the second region have a diameter of a circular pipe as a boundary.

Preferably, the grid adjusting frame comprises parallel plates, a plurality of parallel plates are transversely and longitudinally staggered to form a plurality of channels, and the parallel plates are parallel to the central axis of the circular tube.

Preferably, the grid adjustment frame further comprises one or more inclined plates located at the intersection of the first region and the second region and inclined from the first region to the second region.

Preferably, the included angle between the inclined plate and the central axis of the circular tube is 1-10 degrees.

Preferably, the grill adjustment frame further includes a vortex separation plate disposed in the second region near the center of the circular pipe, the vortex separation plate being perpendicular to a boundary between the first region and the second region.

Preferably, the grill adjustment frame further includes a vortex separation plate disposed in the second region near the center of the circular pipe, the vortex separation plate being perpendicular to a boundary between the first region and the second region.

Preferably, the cross-section of the channel is circular or polygonal.

Preferably, the length of the tube is at least 1.6 times the diameter of the tube.

Preferably, both ends of the circular tube are provided with connecting flanges.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention has simple and reasonable structure, and can adjust the flow field of the fluid flowing through the elbow pipe through the asymmetric channel, so that the fluid flow becomes uniform, the influence of the non-uniform inflow generated by the elbow pipe on a pump or a valve can be eliminated, and the service life of the equipment is prolonged.

2. According to the invention, the rectifier is divided into two channel areas with different sizes by the grid adjusting frame, the size of the channel in the first area arranged outside the elbow is larger than that of the channel in the second area arranged inside the elbow, so that the flow velocity of fluid outside the elbow can be well reduced, and the flow velocity of the fluid is uniform.

3. The inclined plate forming a certain angle with the axis of the circular pipe (the outlet axis of the bent pipe) is arranged at the intersection of the first area and the second area (the center of the circular pipe), the first area is inclined towards the second area, the movement direction of fluid at the intersection can be adjusted, so that the fluid at the center is inclined, part of the fluid flows towards the inner side of the bent pipe, the speed of the fluid at the inner side is increased, and the flow rate of the fluid is uniform.

4. The vortex separation plate is arranged in the second area close to the center of the circular tube, so that the vortex area of fluid on the inner side of the bent tube can be damaged well, the flowing direction of the fluid on the inner side is adjusted, and the speed and the direction of the fluid in the cross section of the whole circular tube tend to be consistent.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic perspective view of a grid adjustment frame according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a grill adjustment stand according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of an elbow.

FIG. 5 is a cloud of pipe velocities at the cross-section of FIG. 4 at the aft end of an elbow without a flow conditioner installed.

FIG. 6 is a cloud of pipe velocities at the cross-section of FIG. 4 after installation of the rear end of the elbow of the present invention.

The figures show that:

second zone 4 of the circular tube 1

Grid adjusting frame 2 inclined plate 5

First zone 3 swirl baffle 6

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The invention aims to provide a flow regulator which has a unique structure, eliminates the speed distribution distortion generated by an elbow to the maximum extent and reduces the impact influence of non-uniform force on a pump and a valve downstream of the elbow. According to the flow regulator for regulating the flow velocity distribution of fluid at the rear end of the bent pipe, as shown in fig. 1-3, the flow regulator comprises a round pipe and a grid regulating frame, wherein the grid regulating frame is arranged inside the round pipe, the length direction of the grid regulating frame is along the axial direction of the round pipe, and the grid regulating frame divides the inner part of the round pipe into a plurality of channels; the cross section of the circular tube is divided into a first area and a second area by the grid adjusting frame, the number and the density of the channels in the first area are both larger than those in the second area, and the size of the channels in the first area is smaller than that in the second area; the first region is mounted outside the bend of the elbow and the second region is mounted inside the bend of the elbow.

Preferably, the first region and the second region have a diameter of a circular pipe as a boundary. Of course, according to practical circumstances, the boundary between the first region and the second region is not necessarily a straight line, and may be a broken line, a curved line or another line type, and the boundary between the first region and the second region may be arranged to be deviated from the diameter of the circular tube. Preferably, the first region is at an angle to the second region perpendicular to the outside-to-inside line of orientation of the elbow, or at an angle to the perpendicular to the outside-to-inside line of orientation of the elbow. The directional line from the outer side to the inner side of the elbow is illustrated by fig. 3, and the flow regulator suitable for regulating the fluid flow velocity distribution at the rear end of the elbow is horizontally installed at the rear end (downstream) of the elbow in the grid regulating rack arrangement manner shown in fig. 3, the first area, i.e., the left area in fig. 3, is installed at the outer side of the elbow, the second area, i.e., the right area in fig. 3, is installed at the inner side of the elbow, and the directional line from the outer side to the inner side of the elbow, i.e., the horizontal line from. As shown in fig. 4, the inside of the included angle between the two ends of the bent pipe is the inner side of the bent pipe, and the opposite side is the outer side of the bent pipe.

The grid adjusting frame comprises parallel plates, a plurality of parallel plates are transversely and longitudinally staggered to form a plurality of channels, and the parallel plates are parallel to the central axis of the circular tube. The grid spacer also includes one or more inclined plates positioned at the intersection of the first zone and the second zone and inclined from the first zone to the second zone. The included angle between the inclined plate and the central axis of the circular tube is 1-10 degrees. The grid adjusting frame further comprises a vortex separation plate, the vortex separation plate is arranged in the second area and close to the center of the circular pipe, and the vortex separation plate is perpendicular to a boundary of the first area and the second area.

Preferably, the included angle between the inclined plate and the central axis of the circular tube is 1-4 degrees. Determined from the Reynolds number Re at the elbow, where Re is ρ vd/μ, ρ is the fluid density, v is the fluid flow rate, and d isThe diameter of the round tube, μ is the dynamic viscosity of the fluid. Re<10⁶The included angle is 1 degree Re<10⁷The included angle is 2 degrees and Re<10⁸The included angle is 3 degrees and Re>10⁸And the included angle is 4 degrees. Preferably, the swirl separation plate can forcibly block the rotational motion of the swirl generated at the rear end (downstream) of the elbow, so that the rotational motion of the fluid is reduced and the fluid flows more axially along the elbow (or pipe). The swirl plates are parallel to or at an angle to the outside-to-inside line of the elbow, and in one embodiment are located on the diameter of the pipe parallel to the outside-to-inside line of the elbow.

The cross section of the channel is circular or polygonal, and preferably, the side length or the diameter of the channel in the second area is at least 1.3 times of the side length or the diameter of the channel in the first area. The length of the circular tube is at least 1.6 times of the diameter of the circular tube, so that a good rectification effect is guaranteed. And the two ends of the circular tube are both provided with connecting flanges, and the circular tube is arranged at the rear end of the bent tube (namely the downstream of the bent tube) through the connecting flanges at the two ends.

While the basic embodiment of the present application has been described above, the present application will be described in more detail with reference to preferred embodiments and/or variations of the basic embodiment.

In one embodiment, as shown in fig. 1 to 3, a flow regulator for regulating the flow velocity distribution of fluid at the rear end of a bent pipe, a channel is divided into a square hole, a rectangular hole and an irregular hole by criss-cross parallel plates, as shown in fig. 3, the side length of the square hole in a first region is a, the side length of the square hole far from the first region in a second region is e, the side length of the square hole close to the first region is b, the square hole close to the intersection of the second region and the first region is divided into two rectangles by a vertical parallel plate, the rectangular short side is c, the rectangular long side is b, a horizontal "convex" hole is formed in the middle of the second region, the convex top of the horizontal "convex" hole is an inclined plate, the inclined plate is inclined from the first region to the second region, the upstream end of the inclined plate is vertically in the same position as the vertical parallel plate, and the width of the inclined plate is d, the middle of the horizontal convex hole is horizontally provided with a vortex separation plate (arranged parallel to a direction line from the outer side to the inner side of the bent pipe) for separating the vortex at the position and reducing the flowing complexity, the vortex separation plate is vertical to the inclined plate, and the distance from the vortex separation plate to the two sides of the bottom of the horizontal convex hole is f. In the second region, the size of the through hole gradually decreases from the side far away from the first region to the side near the first region (except for irregular holes with edges contacting the circular tube), and in one embodiment, b is 4/3a, c is 2/3a, d is 8/3a, and e is 5/3 a. The length of the round tube is 1.6 times of the diameter of the round tube.

And the parallel plates, the inclined plates and the vortex separation plate are made of steel plates. Preferably, the included angle between the inclined plate and the central axis of the circular tube is 1 degree, the inclined plate enables the speed direction of the fluid to be changed remarkably, and the fluid moves towards the inner side of the elbow to counteract the influence of centrifugal movement of the fluid near the elbow. The parallel plates are parallel to the central axis of the pipe to force the fluid to flow along the axis of the pipe. The hole site asymmetric distribution that inclined plate, parallel plate and circle formed, the square hole that constitutes for the parallel plate outside the return bend, square hole side length is less relatively, this is because the return bend outside velocity of flow is higher, needs to increase the resistance of the quantity increase here fluid of square hole, the square hole that constitutes for the parallel plate in the return bend inboard, square hole side length is greater relatively, this is because the inboard velocity of flow of return bend is lower, needs to reduce the resistance of the quantity reduction here fluid of square hole.

In the flow regulator in the embodiment, the square hole close to the outer side of the elbow pipe matched with the flow regulator is smaller, and the square hole close to the inner side of the elbow pipe matched with the flow regulator is larger, so that the flow velocity of fluid outside the elbow pipe can be well reduced; the vortex separation plate is arranged close to the square hole on the inner side of the elbow pipe matched with the vortex separation plate, so that the vortex region of fluid on the inner side of the elbow pipe can be damaged well, and the flow direction of the fluid on the inner side is adjusted, so that the speed and the direction of the fluid in the cross section of the whole circular pipe tend to be consistent; an inclined plate which forms a certain angle with the outlet axis of the elbow is arranged in the center of the flow regulator, and the moving direction of the fluid at the position can be regulated, so that the fluid in the center is inclined, and part of the fluid flows to the inner side of the elbow to increase the speed of the fluid at the inner side. Fig. 4 is a 90-degree elbow, the fluid velocity of the elbow is measured at the downstream of the elbow at the position of the section of the velocity cloud chart shown in fig. 4, a velocity cloud chart is manufactured, fig. 5 is a velocity cloud chart of the rear end (downstream) of the elbow without the flow regulator, it can be seen that two vortices are symmetrically distributed in the section, the variance of the velocity distribution of the section is 1.41 through calculation, fig. 5 is a velocity cloud chart of the rear end (downstream) of the elbow with the flow regulator of the invention suitable for adjusting the fluid velocity distribution of the rear end of the elbow, the invention is installed before the section is measured, it can be seen that the two vortices before are disappeared, the velocity is distributed in a substantially concentric circle, and the variance of the velocity distribution of the section is 1.13 through calculation. The CFD analysis can be used for concluding that through the unique structural distribution rectification of the invention, when the fluid flows through the elbow, the fluid field is effectively adjusted by the asymmetric holes in the invention, so that the fluid flow becomes uniform, the influence of the non-uniform incoming flow generated by the 90-degree elbow on a pump or a valve can be eliminated, and the service life of the equipment is prolonged. The invention has wide application range and is suitable for flange connection type 90-degree bent pipes, direct welding type 90-degree bent pipes, pipeline welding type 90-degree bent pipes and the like.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.