WO2017109950A1 - ベンド管及びこれを備える流体機械 - Google Patents
ベンド管及びこれを備える流体機械 Download PDFInfo
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- WO2017109950A1 WO2017109950A1 PCT/JP2015/086279 JP2015086279W WO2017109950A1 WO 2017109950 A1 WO2017109950 A1 WO 2017109950A1 JP 2015086279 W JP2015086279 W JP 2015086279W WO 2017109950 A1 WO2017109950 A1 WO 2017109950A1
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- Prior art keywords
- bend pipe
- straight line
- pipe
- bend
- flow
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
Definitions
- the present disclosure relates to a bend pipe and a fluid machine including the same.
- an inlet pipe and an outlet pipe in a fluid machine may include a bend pipe for changing the direction in which the fluid flows in the layout of the equipment.
- Patent Document 1 paying attention to the occurrence of a drift toward the outside in the bending direction at the outlet of the bent portion (bend pipe portion) of the bend pipe, as shown in FIG. 27A, the inlet pipe portion (upper part) to the bent portion of the bend pipe is shown. It is shown that the connecting line between the draft) and the bent portion is decentered toward the outside in the bending direction. As a result, the flow on the outer side in the bending direction of the bent portion is decelerated to achieve a uniform velocity distribution.
- At least one embodiment of the present invention aims to provide a bend pipe capable of suppressing the occurrence of peeling in an inner region in the bending direction and a fluid machine including the same.
- a bend pipe is a bend pipe for supplying a fluid to a fluid machine or discharging a fluid from the fluid machine, and includes a straight inlet pipe section and the inlet pipe.
- a bend pipe section connected to the downstream end of the section and configured to change the flow direction of the fluid; and a linear outlet pipe section connected to the downstream end of the bend pipe section; and the inlet pipe section
- a straight line made up of the tube axis center line and its extension line is a straight line L
- a straight line made up of the tube axis center line of the outlet pipe part and its extension line is a straight line M
- a plane perpendicular to the straight line M is perpendicular to the straight line M.
- a direction parallel to an intersecting line with a plane is defined as a direction I.
- the side where the inlet pipe portion is present with respect to the straight line M is the front side
- the straight line M is the front side.
- the bend pipe part Definitive bending outward side, in the rear side of the straight line M, including the outer inclined surface which is inclined so that the distance between the straight line M toward the downstream side is reduced.
- the direction of the flow after passing through the bent pipe portion is inclined with respect to the straight line M so that the direction of the flow advances toward the downstream side of the bend pipe as it goes downstream.
- the separation flow generated in the region inside the bending direction of the bend pipe is quickly reattached to the inside to suppress the development of the separation flow, or Generation
- the maximum inclination angle formed by the outer inclined surface with respect to a straight line parallel to the straight line M when viewed from the direction I is 10 ° or more.
- the bend pipe described in the above (2) since the inclination of the flow direction after passing through the bent pipe portion with respect to the straight line M can be increased to some extent, the separation flow in the area inside the bend pipe in the bending direction can be increased. Development or occurrence can be suppressed with high effectiveness.
- the pipe axis center line of the bend pipe part is a back side eccentric part separated from the straight line M to the back side.
- a distance ⁇ 1 between the straight line M and a position farthest from the straight line M to the deep side in the back side eccentric portion satisfies ⁇ 1 ⁇ 0.1De.
- the bend pipe described in the above (4) since the inclination of the flow direction after passing through the bent pipe portion with respect to the straight line M can be increased to some extent, the separation flow in the area inside the bend pipe in the bending direction can be increased. Development or occurrence can be suppressed with high effectiveness.
- the flow path cross-sectional area in at least a part of the bend pipe section is the inlet pipe. It is larger than the channel cross-sectional area A1 of the part and larger than the channel cross-sectional area A3 of the outlet pipe part.
- the pressure loss of the fluid in the pipe increases in proportion to the square of the fluid velocity. For this reason, in a bend pipe part where a large pressure loss is likely to occur, it is desirable from the viewpoint of reducing the pressure loss to increase the cross-sectional area of the flow path and reduce the flow velocity.
- the flow path cross-sectional area in at least a part of the bend pipe section 4 is larger than the flow path cross-sectional area A1 of the inlet pipe section and the flow path cross-sectional area A3 of the outlet pipe section.
- the swirl component is reduced as a result of expanding the cross-sectional area of the flow path at the bend pipe portion, and the flow is uniformized and the pressure loss is reduced. be able to.
- the bend pipe section is a direction orthogonal to the direction I in at least a part of the section.
- the bend pipe part includes a cross section in which the center of gravity is located on the inner side in the bending direction than the center of the flow path width in the direction orthogonal to the direction I.
- the fluid it is difficult for the fluid to flow in the region outside the bending direction, and conversely, the fluid easily flows into the region inside the bending direction from the center. As a result, peeling is reduced, and pressure loss in the bend pipe portion can be reduced.
- the flow rate decreases in the region outside the bending direction where the influence of centrifugal force is strong, and the development of the secondary flow is suppressed by the inclination of the wall surface.
- the bend pipe section is a direction orthogonal to the direction I in at least a part of the section.
- the flow path width in J has a flat shape smaller than the flow path width in the direction I.
- the influence of the centrifugal force is reduced by making the flow path width in the direction J smaller than the flow path width in the direction I among the flow path widths of the bend pipe section. Can do. Thereby, while suppressing the drift to the area
- the flat shape is an ellipse, a rectangle, or a shape in which R is added to four corners of the rectangle.
- the side surface in the bending direction of the bend pipe portion is more than the outer inclined surface.
- the downstream side includes an inner inclined surface that is inclined so that the distance from the straight line M decreases toward the downstream side.
- a part of the flow from the bend pipe part to the outlet pipe part is curved so as to follow the inner inclined surface, and the partial backflow and local separation as described above can be suppressed.
- the straight line parallel to the straight line M when viewed from the direction I the straight line parallel to the straight line M when viewed from the direction I.
- the maximum value ⁇ 1 of the inclination angle formed by the outer inclined surface and the maximum value ⁇ 2 of the inclination angle formed by the inner inclined surface with respect to the straight line parallel to the straight line M satisfy ⁇ 1 ⁇ ⁇ 2.
- the pipe axis center line of the bend pipe part is a back side eccentric part separated from the straight line M to the back side. And a front-side eccentric part that is separated from the straight line M to the front side downstream of the back-side eccentric part.
- a distance ⁇ 1 between the straight line M and a position farthest from the straight line M to the deep side in the back side eccentric portion satisfies the straight line ⁇ 1 ⁇ ⁇ 2.
- a fluid machine includes an impeller, a casing that covers the impeller, an inlet pipe that is connected to the upstream side of the casing and guides fluid to the impeller, An outlet pipe connected to the downstream side of the casing and for discharging the fluid that has passed through the impeller, wherein the inlet pipe or the outlet pipe is any one of the above (1) to (13). It is a bend pipe of description.
- the bend pipe described in any one of the above (1) to (13) since the bend pipe described in any one of the above (1) to (13) is provided, the development of delamination in a region inside the bending direction of the bend pipe or Occurrence can be suppressed. Thereby, the efficiency of the fluid machine can be improved.
- the fluid machine according to (14) above wherein the fluid machine is a turbine, an axial compressor, or a centrifugal compressor.
- a bend pipe capable of suppressing the occurrence of peeling in an inner region in a bending direction and a fluid machine including the same are provided.
- FIG. 1 is a schematic perspective view of a bend pipe 100 according to an embodiment. It is the schematic which shows an example of the shape of the bend pipe
- FIG. It is the schematic which shows an example of the shape of the bend pipe
- FIG. It is the schematic which shows an example of the shape of the bend pipe
- FIG. It is a figure for demonstrating the effect which suppresses development or generation
- FIG. 5 is a diagram illustrating a relationship between a pipe axis direction position m of the bend pipe 100 illustrated in FIG. 4 and a flow path cross-sectional area A.
- FIG. 5 is a diagram showing an example of a channel cross-sectional shape of the bend pipe section 4 shown in FIGS. FIG.
- FIG. 5 is a diagram showing an example of a channel cross-sectional shape of the bend pipe section 4 shown in FIGS.
- FIG. 5 is a diagram showing an example of a channel cross-sectional shape of the bend pipe section 4 shown in FIGS.
- FIG. 5 is a diagram showing an example of a channel cross-sectional shape of the bend pipe section 4 shown in FIGS.
- FIG. 5 is a diagram showing an example of a channel cross-sectional shape of the bend pipe section 4 shown in FIGS.
- It is a figure showing the shape of bend pipe 100 seen from direction I about bend pipe 100 concerning one embodiment.
- FIG. 17 is a diagram showing an example of cross sections S1 to S5 of the bend pipe section 4 at a plurality of positions (tube axis direction positions) in the flow direction shown in FIG.
- FIG. 17 is a diagram showing an example of cross sections S1 to S5 of the bend pipe section 4 at a plurality of positions (tube axis direction positions) in the flow direction shown in FIG.
- FIG. 17 is a diagram showing an example of cross sections S1 to S5 of the bend pipe section 4 at a plurality of positions (tube axis direction positions) in the flow direction shown in FIG.
- FIG. 3 is a front view showing a region where a separation flow K occurs in the bend pipe 100 as viewed from the upstream side of the bend pipe 100.
- FIG. 6 is a top view showing a region where a separation flow K occurs in the bend pipe 100 as viewed from the direction I.
- 3 is a side view showing a region where a separation flow K occurs in the bend pipe 100 as viewed from the downstream side of the bend pipe 100.
- FIG. It is a figure showing a schematic structure of turbine 20 concerning one embodiment. It is a figure showing a schematic structure of turbine 20 concerning one embodiment.
- FIG. 30 It is a figure showing the schematic structure of axial flow compressor 30 concerning one embodiment. It is a figure showing the schematic structure of axial flow compressor 30 concerning one embodiment. It is a figure which shows schematic structure of the centrifugal compressor 40 which concerns on one Embodiment. It is a figure which shows schematic structure of the centrifugal compressor 40 which concerns on one Embodiment. It is a figure for demonstrating the subject in a conventional structure. It is a figure for demonstrating the eccentric direction of the connection line of the upper draft of a bend pipe
- FIG. 1 is a schematic perspective view of a bend pipe 100 according to an embodiment.
- the bend pipe 100 is a bend pipe for supplying a fluid to a fluid machine, which will be described later, or for discharging the fluid from the fluid machine.
- the fluid flowing through the bend pipe 100 is an energy medium used for energy conversion in a fluid machine, and is, for example, a high-pressure gas or fluid.
- the bend pipe 100 includes a straight inlet pipe section 2, a bend pipe section 4 connected to the downstream end 2 a of the inlet pipe section 2 and configured to change the flow direction of fluid, And a straight outlet pipe portion 6 connected to the downstream end 4a of the bend pipe portion 4.
- a straight line made up of the tube axis center line of the inlet pipe part 2 and its extension line is a straight line L
- a straight line made up of the tube axis center line of the outlet pipe part 6 and its extension line is a straight line M
- a direction parallel to an intersecting line N formed by a plane orthogonal to the straight line L and a plane orthogonal to the straight line M is defined as a direction I.
- the direction I is a direction orthogonal to the plane including the straight line L and the straight line M.
- FIG. 2 is a schematic view showing the shape of the bend tube 100 viewed from the direction I with respect to the bend tube 100 (100A) according to the embodiment.
- FIG. 3 is a schematic diagram illustrating the shape of the bend tube 100 viewed from the direction I with respect to the bend tube 100 (100B) according to the embodiment.
- FIG. 4 is a schematic diagram illustrating the shape of the bend tube 100 viewed from the direction I with respect to the bend tube 100 (100C) according to the embodiment.
- the bend pipe 100 when the bend pipe 100 is viewed from the direction I as shown in FIGS. 2 to 4, the side where the inlet pipe portion 2 exists with respect to the straight line M is the front side, and the straight line M is the front side. If the side where the inlet pipe part 2 does not exist is defined as the back side, the side surface 4A on the outer side in the bending direction (curvature outer diameter side) of the bend pipe part 4 is the rear side of the straight line M.
- the outer inclined surface 8 is inclined so that the distance d1 is reduced.
- the flow direction E after passing through the bent pipe portion 4 proceeds toward the inner side in the bending direction of the bend pipe 100 toward the downstream side. Tilt.
- the separation flow K generated in the inner region in the bending direction of the bend pipe 100 is quickly reattached to the inside to suppress the development of the separation flow, or the separation flow.
- the generation of K itself can be suppressed.
- the effect of suppressing the separation flow is described by taking the bend pipe shape shown in FIG. 2 as an example, but the same effect can be obtained by having the outer inclined surface 8 in the bend pipe shape shown in FIGS. 3 and 4. Play.
- the maximum value ⁇ 1 of the inclination angle formed by the outer inclined surface 8 with respect to the straight line parallel to the straight line M is 10 ° or more. It is.
- the tube axis center line H of the bend tube portion 4 has a back-side eccentric portion Hr separated from the straight line M to the back side.
- the distance ⁇ 1 between the straight line M and the distance P1 farthest away from the straight line M in the back side eccentric part Hr, and the diameter of the outlet pipe part 6 De satisfies ⁇ 1 ⁇ 0.1De.
- the side surface 4B on the inner side in the bending direction of the bend pipe portion 4 has an inclined surface 12 in which the distance d2 from the straight line M decreases toward the downstream side, and the inclined surface 12B. It may include an inclined surface 10 provided on the downstream side of the surface 12 and having a distance d2 to the straight line M that increases toward the downstream side.
- the side surface 4B on the inner side in the bending direction of the bend pipe portion 4 has an inclined surface 12 in which the distance d2 from the straight line M decreases toward the downstream side, And a non-inclined surface 14 that is provided on the downstream side and has a constant distance d2 regardless of the position in the flow direction.
- FIG. 6 is a diagram showing the relationship between the pipe axis direction position m and the flow path cross-sectional area A in the bend pipe 100 shown in FIG.
- the flow path cross-sectional area in at least a part of the bend pipe section 4 is the flow path cross-sectional area A1 of the inlet pipe section 2 and the flow path cross-sectional area A3 of the outlet pipe section 6. It may be larger than each of the above.
- the pressure loss of the fluid in the pipe increases in proportion to the square of the fluid velocity. For this reason, in the bend pipe part 4 in which a large pressure loss is particularly likely to occur, it is desirable from the viewpoint of reducing the pressure loss to increase the flow path cross-sectional area and reduce the flow velocity.
- the flow passage cross-sectional area in at least a part of the bend pipe portion 4 is larger than each of the flow passage cross-sectional area A1 of the inlet pipe portion 2 and the flow passage cross-sectional area A3 of the outlet pipe portion 6.
- the side surface 4B on the inner side in the bending direction of the bend pipe portion 4 has a smaller distance d2 from the straight line M toward the downstream side than the outer inclined surface 8 toward the downstream side.
- the inner inclined surface 16 may be included so as to be inclined.
- the inner inclined surface 16 is continuously formed on the downstream side of the inclined surface 10 described above. According to such a configuration, as shown in FIG. 9, the flow from the bend pipe part 4 to the outlet pipe part 6 is curved so as to follow the inner inclined surface 16, and the partial backflow or local separation as described above is performed. Can be suppressed.
- the maximum value ⁇ 2 may satisfy ⁇ 1 ⁇ ⁇ 2.
- the tube axis center line H of the bend pipe portion 4 has a front side eccentric portion Hf that is separated from the straight line M to the front side on the downstream side of the back side eccentric portion Hr.
- the flow from the bend pipe part 4 to the outlet pipe part 6 is curved so as to follow the inner inclined surface 16, and the partial backflow and local separation as described above are suppressed. be able to.
- the distance ⁇ 2 between the distant place Q and the straight line M may satisfy ⁇ 1 ⁇ ⁇ 2.
- FIG. 10 is a diagram showing the relationship between the pipe axis direction position m of the bend pipe 100 shown in FIG.
- the channel cross-sectional area in at least a part of the bend pipe part 4 is larger than each of the channel cross-sectional area A1 of the inlet pipe part 2 and the channel cross-sectional area A3 of the outlet pipe part 6. It's getting bigger.
- the flow path cross-sectional area of the bend pipe section 4 is equal to the pipe axial position m4 on the downstream side of the pipe axial position m2 where the flow path cross-sectional area of the bend pipe section 4 takes the maximum value A2.
- the maximum value A4 is taken. According to such a configuration, it is possible to suppress peeling and reduce pressure loss over a wide area inside the bending pipe 100 in the bending direction.
- FIG. 11 is a view showing an example of the cross-sectional shape of the flow path of the bend pipe section 4 shown in FIGS.
- FIG. 12 is a diagram showing an example of the cross-sectional shape of the flow path of the bend pipe section 4 shown in FIGS.
- FIG. 13 is a view showing an example of the cross-sectional shape of the flow path of the bend pipe section 4 shown in FIGS.
- FIG. 14 is a diagram showing an example of the cross-sectional shape of the flow path of the bend pipe section 4 shown in FIGS.
- FIG. 15 is a diagram showing an example of the cross-sectional shape of the flow path of the bend pipe section 4 shown in FIGS.
- the flow path cross section of the bend pipe part 4 may be circular.
- the bend pipe portion 4 has a center of gravity G positioned at the inner side in the bending direction from the center O of the flow path width Wb in the direction J orthogonal to the direction I in at least some sections.
- a cross section may be included. That is, in the cross section of at least a part of the bend pipe section 4, the flow path cross-sectional area A2out on the outer side in the bending direction than the center O of the flow path width Wb is larger than the flow path cross-sectional area A2in on the inner side in the bending direction from the center O. May be smaller.
- the bend pipe part 4 includes a cross section in which the center of gravity G is located on the inner side in the bending direction than the center O of the flow path width Wb, so that the bending pipe part 4 has an outer side in the bending direction than the center O. It becomes difficult for the fluid to flow to the region, and conversely, the fluid easily flows to the region on the inner side in the bending direction from the center O. As a result, peeling is reduced, and pressure loss in the bend pipe portion 4 can be reduced.
- the flow rate decreases in the region outside the bending direction where the influence of the centrifugal force is strong, and the development of the secondary flow (see FIG. 7) is suppressed by the inclination of the wall surface 18.
- the bend pipe section 4 is configured such that the flow path width Wb in the direction J perpendicular to the direction I is at least a part of the flow path width Wa in the direction I. It may have a smaller flat shape.
- the flat shape may be an ellipse as shown in FIG. 13, a rectangle as shown in FIG. 14, or a shape with Rs at the four corners of the rectangle as shown in FIG. 15. There may be.
- polygons such as a rhombus and a trapezoid, and the shape which added R to the corner
- the influence of the centrifugal force can be reduced by making the flow path width Wb in the direction J smaller than the flow path width Wa in the direction I.
- FIG. 16 is a schematic diagram illustrating the shape of the bend tube 100 as viewed from the direction I with respect to the bend tube 100 according to the embodiment.
- FIG. 17 is a view showing an example of the cross sections S1 to S5 of the bend pipe section 4 at a plurality of positions (tube axis direction positions) in the flow direction shown in FIG.
- FIG. 18 is a view showing an example of the cross sections S1 to S5 of the bend pipe section 4 at a plurality of positions (positions in the pipe axis direction) in the flow direction shown in FIG.
- the cross sections S1 to S5 are cross sections viewed from the downstream side in the flow direction.
- the vertex position V at which the flow path width in each of the cross sections S1 to S5 of the bend pipe section 4 is maximum may be constant regardless of the position in the flow direction.
- the above-described outer inclined surface 8 can be formed with a simple shape.
- the vertex position V at which the flow path width in each cross section of the bend pipe section 4 is maximum is an axis line toward the downstream side. It may be shifted around the swirl direction C of the flow.
- the bend pipe 100 described above may be applied to an inlet pipe 22 (intake chamber) of a turbine 20 as a fluid machine, as shown in FIG. That is, as shown in FIG. 20, a turbine including an impeller 24, a turbine casing 26 that covers the impeller 24, and an inlet pipe 22 that is connected to the upstream side of the turbine casing 26 and guides fluid to the impeller 24.
- the inlet pipe 22 may be the bend pipe 100.
- the bend pipe 100 described above may be applied to an outlet pipe 28 (exhaust chamber) of the turbine 20 as a fluid machine, as shown in FIG. That is, as shown in FIG. 21, an impeller 24, a turbine casing 26 that covers the impeller 24, an outlet pipe 28 that is connected to the downstream side of the turbine casing 26 and discharges the fluid that has passed through the impeller 24, In the turbine 20 including the outlet pipe 28, the bend pipe 100 may be used.
- the above-described bend pipe 100 may be applied to an inlet pipe 32 (intake chamber) of an axial compressor 30 as a fluid machine, as shown in FIG. That is, as shown in FIG. 22, an impeller 34, a compressor casing 36 that covers the impeller 34, and an inlet pipe 32 that is connected to the upstream side of the compressor casing 36 and guides fluid to the impeller 34.
- the inlet pipe 32 may be the bend pipe 100.
- the bend pipe 100 described above may be applied to an outlet pipe 38 (exhaust chamber) of an axial compressor 30 as a fluid machine, as shown in FIG. 23, the impeller 34, the compressor casing 36 that covers the impeller 34, and the outlet pipe that is connected to the downstream side of the compressor casing 36 and discharges the fluid that has passed through the impeller 34. 38, the outlet pipe 38 may be the bend pipe 100.
- the bend pipe 100 described above may be applied to an inlet pipe 42 of a centrifugal compressor 40 as a fluid machine, as shown in FIG. That is, as shown in FIG. 24, an impeller 44, a compressor casing 46 that covers the impeller 44, and an inlet pipe 42 that is connected to the upstream side of the compressor casing 46 and guides fluid to the impeller 44.
- the inlet pipe 42 may be the bend pipe 100.
- the bend pipe 100 described above may be applied to an outlet pipe 48 (discharge scroll) of a centrifugal compressor 40 as a fluid machine, as shown in FIG. That is, as shown in FIG. 25, the impeller 44, the compressor casing 46 (see FIG. 24) covering the impeller 44, and the downstream side of the compressor casing 46 are connected, and the fluid that has passed through the impeller 44 is discharged.
- the outlet pipe 48 may be the bend pipe 100.
- the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
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Abstract
Description
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」「一致」等の相対的な配置関係を表す表現は、厳密にそのような相対的配置関係を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
また、一の構成要素を「備える」、「具える」、「具備する」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。
2a 下流端
4 ベンド管部
4A 側面
4B 側面
4a 下流端
6 出口管部
8 外側傾斜面
10 傾斜面
12 傾斜面
14 非傾斜面
16 内側傾斜面
18 壁面
20 タービン
22 入口配管
24 羽根車
26 タービンケーシング
28 出口配管
30 軸流圧縮機
32 入口配管
34 羽根車
36 圧縮機ケーシング
38 出口配管
40 遠心圧縮機
42 入口配管
44 羽根車
46 圧縮機ケーシング
48 出口配管
100 ベンド管
A 流路断面積
A1 流路断面積
A2 最大値
A3 流路断面積
A2in 流路断面積
A2out 流路断面積
A4 極大値
C 旋回方向
De 直径
E 方向
G 重心
H 管軸中心線
Hf 手前側偏心部
Hr 奥側偏心部
I 方向
J 方向
K 剥離流れ
L 直線
M 直線
N 交線
O 中心
V 頂点位置
Wa 流路幅
Wb 流路幅
d1 距離
d2 距離
m 管軸方向位置
m2 管軸方向位置
m4 管軸方向位置
Claims (15)
- 流体を流体機械に供給するための又は流体機械から排出するためのベンド管であって、
直線状の入口管部と、
前記入口管部の下流端に接続し、前記流体の流れ方向を変更するよう構成されたベンド管部と、
前記ベンド管部の下流端に接続する直線状の出口管部と、
を備え、
前記入口管部の管軸中心線及びその延長線からなる直線を直線L、前記出口管部の管軸中心線及びその延長線からなる直線を直線M、前記直線Mに直交する平面と前記直線Mに直交する平面とのなす交線に平行な方向を方向Iと定義し、
前記方向Iから視たときに、前記直線Mに対して前記入口管部が存在する側を手前側、前記直線Mに対して前記入口管部が存在しない側を奥側と定義すると、
前記ベンド管部における曲がり方向外側の側面は、前記直線Mより奥側において、下流側に向かうにつれて前記直線Mとの距離が小さくなるように傾斜する外側傾斜面を含む、ベンド管。 - 前記方向Iから視たときに、前記直線Mに平行な直線に対して前記外側傾斜面がなす傾斜角度の最大値α1は10°以上である、請求項1に記載のベンド管。
- 前記ベンド管部の管軸中心線は、前記直線Mから前記奥側に離れた奥側偏心部を有する、請求項1又は2に記載のベンド管。
- 前記奥側偏心部のうち前記直線Mから前記奥側に最も離れた箇所と前記直線Mとの距離δ1と、前記出口管部の直径Deとは、δ1≧0.1Deを満たす、請求項3に記載のベンド管。
- 前記ベンド管部の少なくとも一部の区間における流路断面積は、前記入口管部の流路断面積A1よりも大きく、前記出口管部の流路断面積A3よりもよりも大きい、請求項1乃至4の何れか1項に記載のベンド管。
- 前記ベンド管部は、少なくとも一部の区間において、前記方向Iに直交する方向における流路幅の中心よりも曲がり方向内側に重心が位置する断面を含む、請求項1乃至5の何れか1項に記載のベンド管。
- 前記ベンド管部は、少なくとも一部の区間において、前記方向Iと直交する方向Jにおける流路幅が前記方向Iにおける流路幅よりも小さい扁平形状を有する、請求項1乃至6の何れか1項に記載のベンド管。
- 前記扁平形状は、楕円形、長方形、又は長方形の4隅にRをつけた形状である、請求項7に記載のベンド管。
- 前記ベンド管部における曲がり方向内側の側面は、前記外側傾斜面よりも下流側に、下流側に向かうにつれて前記直線Mとの距離が小さくなるように傾斜する内側傾斜面を含む、請求項1乃至8の何れか1項に記載のベンド管。
- 前記方向Iから視たときに、前記直線Mに平行な直線に対して前記外側傾斜面がなす傾斜角度の最大値α1と、前記直線Mに平行な直線に対して前記内側傾斜面がなす傾斜角度の最大値α2とは、α1≧α2を満たす、請求項9に記載のベンド管。
- 前記ベンド管部の管軸中心線は、前記直線Mから前記奥側に離れた奥側偏心部と、前記奥側偏心部より下流側にて前記直線Mから前記手前側に離れた手前側偏心部と、を有する、請求項9又は10に記載のベンド管。
- 前記奥側偏心部のうち前記直線Mから前記奥側に最も離れた箇所と前記直線Mとの距離δ1と、前記手前側偏心部のうち前記直線Mから前記手前側に最も離れた箇所と前記直線Mとの距離δ2とは、δ1≧δ2を満たす、請求項11に記載のベンド管。
- 前記ベンド管部の少なくとも一部の区間において、前記ベンド管部の各断面における流路幅が最大となる頂点位置は、下流側に向かうにつれて前記ベンド管部の管軸中心線回りにシフトする、請求項1乃至12の何れか1項に記載のベンド管。
- 羽根車と、
前記羽根車を覆うケーシングと、
前記ケーシングの上流側に接続し、前記羽根車に流体を導くための入口配管と、
前記ケーシングの下流側に接続し、前記羽根車を通過した流体を排出するための出口配管と、
を備え、前記入口配管又は前記出口配管が請求項1乃至13の何れか1項に記載のベンド管である、流体機械。 - 前記流体機械は、タービン、軸流圧縮機又は遠心圧縮機である、請求項14に記載の流体機械。
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JP2017557630A JP6605041B2 (ja) | 2015-12-25 | 2015-12-25 | ベンド管及びこれを備える流体機械 |
CN201580084918.1A CN108700241B (zh) | 2015-12-25 | 2015-12-25 | 弯管及具备该弯管的流体机械 |
EP15911387.7A EP3369982B1 (en) | 2015-12-25 | 2015-12-25 | Bend pipe and fluid machine comprising same |
US15/779,337 US11435020B2 (en) | 2015-12-25 | 2015-12-25 | Bend pipe and fluid machine comprising same |
PCT/JP2015/086279 WO2017109950A1 (ja) | 2015-12-25 | 2015-12-25 | ベンド管及びこれを備える流体機械 |
EP20182247.5A EP3736482B1 (en) | 2015-12-25 | 2015-12-25 | Bend pipe and fluid machine comprising same |
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CN113290169B (zh) * | 2021-04-19 | 2023-08-25 | 四川川交路桥有限责任公司 | 一种钢筋加工用弯拱装置 |
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Publication number | Publication date |
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EP3369982A4 (en) | 2018-10-17 |
CN108700241A (zh) | 2018-10-23 |
EP3369982A1 (en) | 2018-09-05 |
EP3736482A1 (en) | 2020-11-11 |
US20180306365A1 (en) | 2018-10-25 |
US11435020B2 (en) | 2022-09-06 |
EP3369982B1 (en) | 2022-03-09 |
JP6605041B2 (ja) | 2019-11-13 |
CN108700241B (zh) | 2021-07-30 |
JPWO2017109950A1 (ja) | 2018-06-28 |
EP3736482B1 (en) | 2022-06-08 |
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