JP2023108460A - Flow passage mechanism - Google Patents

Abstract

To reduce pressure loss when fluid flows into a flow passage.SOLUTION: A flow passage mechanism includes: a flow passage through which fluid passes; a louver which is disposed on an upstream side of the flow passage and in which a plurality of vanes tilted to the same direction with respect to an extending direction of the flow passage are arranged in a row state in a direction orthogonal to the extending direction of the flow passage; and a contraction flow passage which connects an end on the flow passage side of the louver and an end on the louver side of the flow passage and whose opening area becomes smaller toward the flow passage from the louver.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a channel mechanism.

A flow path mechanism for taking in the atmosphere or the like as cooling air includes a louver in which a plurality of blades are arranged in parallel at a suction port serving as an inlet of the flow path. The louver can suppress the entry of foreign matter and serves as a blind for the suction port. Patent Literature 1 describes a structure in which a louver (air blowing adjusting register) that can change the angle of the blades is provided at the blowing port.

JP-A-2000-255255

Here, the louver has a structure in which the louvers are inclined with respect to the direction in which the flow path extends. For this reason, the direction of fluid flow changes between the fluid that has passed through the louver and the fluid that has passed through the channel, and separation of the fluid may occur on the inlet side of the channel. As the separation of the fluid flow increases, the pressure loss increases. Pressure loss also occurs due to changes in the area through which the fluid passes due to changes in the flow of the fluid and the influence of the thickness of the blades of the louver.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a flow path mechanism capable of reducing pressure loss when fluid flows into the flow path.

The flow path mechanism of the present disclosure for achieving the above object is a flow path through which a fluid passes, and a plurality of flow paths disposed upstream of the flow path and inclined in the same direction with respect to the direction in which the flow path extends. A blade connects louvers arranged in a row in a direction perpendicular to the direction in which the flow path extends, an end of the louver on the flow path side, and an end of the flow path on the louver side. and a constricted flow passage whose opening area decreases from the louver toward the flow passage.

According to the present disclosure, it is possible to reduce the pressure loss when the fluid flows into the flow path.

FIG. 1 is a schematic cross-sectional view showing the flow path mechanism of the first embodiment. FIG. 2 is a schematic cross-sectional view showing a modification of the first embodiment. FIG. 3 is a schematic cross-sectional view showing the flow path mechanism of the second embodiment. FIG. 4 is a schematic diagram showing the installation position of the flow guide. FIG. 5 is a schematic diagram showing the installation position of the flow guide.

Embodiments of the flow path mechanism according to the present invention will be described in detail below with reference to the drawings. Note that the present disclosure is not limited by this embodiment. Components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Furthermore, the constituent elements in the embodiments described below can be omitted, replaced, or changed in various ways without departing from the spirit of the present invention. Also, when there are a plurality of embodiments, it also includes those configured by combining each embodiment.

[First Embodiment]
FIG. 1 is a schematic cross-sectional view showing the flow path mechanism of the first embodiment. FIG. 1 is a cross-sectional view taken along a plane parallel to the direction in which the channel mechanism 10 extends (extending direction). In the flow path mechanism 10 shown in FIG. 1, a fluid, which is air in this embodiment, flows in the directions of arrows 50, 52, and 54. As shown in FIG. The flow path mechanism 10 has a suction port 11 open to the atmosphere. The path mechanism 10 is connected with a mechanism, such as an air blower, that generates a force for sucking air from the suction port 11 to the path connected to the path mechanism 10 . For example, the flow path mechanism 10 is connected to the cooling equipment on the downstream side, and supplies the air flowing in from the suction port 11 to the cooling equipment as cooling air (medium for recovering heat from the target of the cooling equipment (radiating fins and heat medium)). do. Although the flow path mechanism 10 of the present embodiment uses the inflow fluid as cooling air, the object to which the inflow fluid is supplied is not limited to cooling equipment. The flow path mechanism 10 can be connected to various objects, for example, a combustion device that burns supplied air and fuel, a device that cools a supplied fluid, a device that uses the supplied fluid as a carrier fluid, and the like. can be supplied with fluid. again. The flow path mechanism 10 may have a structure in which the suction port 11 is connected to another pipe. Further, the flow path mechanism 10 may circulate a fluid, and is not limited to gas, and may circulate a liquid or a two-phase fluid in which a liquid and a gas are mixed.

The flow path mechanism 10 includes a flow path 12 , louvers 14 , and contraction flow paths 16 . The flow path mechanism 10 is arranged in the order of the louver 14, the constriction flow path 16, and the flow path 12 from the suction port 11, that is, from the upstream in the flow direction of the fluid.

The flow path 12 is a pipeline having a rectangular cross section and straight wall surfaces in the extending direction. The flow path 12 preferably has a straight wall surface in the extending direction, but may have a curved wall surface structure. Also, the cross section is not limited to a rectangle, and may be circular or polygonal.

The louver 14 is arranged on the upstream side of the channel 12 and serves as the suction port 11 of the channel mechanism 10 . The louver 14 has multiple blades 20 . The plurality of blades 20 are arranged in a row with a predetermined interval in a direction perpendicular to the extending direction of the flow path 12 . The fluid flowing into the channel mechanism 10 passes between the blades 20 and flows into the channel 12 . The wing plate 20 is a plate material having a uniform thickness and a rectangular cross section, and the longitudinal direction is the direction intersecting the arrangement direction. Although the blades 20 of the present embodiment have a constant thickness, the present invention is not limited to this. The cross section of the wing plate 20 is not limited to a rectangular shape as in the present embodiment, and may have a curved shape, an elliptical shape, a wing shape, or the like. The blade plate 20 has an extending direction inclined with respect to the extending direction of the flow path 12 in the cross section of FIG. 1 .

The contraction channel 16 is a conduit connecting the louver 14 and the channel 12 . The contraction flow path 16 is connected at its upstream end to the downstream end of the louver 14 . The contraction channel 16 is connected at its downstream end to the upstream end of the channel 12 . In the direction in which the blades 20 are arranged, both ends of the upstream end of the contracted flow passage 16 are in contact with the downstream ends of the blades 20 of the louver 14 . The contracted flow passage 16 has a width in a direction perpendicular to the direction in which the blades 20 are arranged, which is the same as or slightly smaller than the blades 20 . As a result, the fluid flowing into the constricted flow passage 16 becomes the fluid that has passed between the blades 20 . The contracted flow passage 16 has an opening area at the end on the upstream side smaller than that at the end on the downstream side.

The flow channel mechanism 10 has the cross section shown in FIG. In a plane perpendicular to and parallel to the extending direction of the flow path 12, the upstream end face of the flow path 12, that is, the plane perpendicular to the extending direction of the flow path 12 forms an acute angle with the blade plate 20. An inner wall surface 30 is defined as a wall surface on the opposite side, and an outer wall surface 32 is defined as a wall surface on the side where the angle between the upstream end surface of the flow path 12 and the louver 20 is an obtuse angle.

In the contracted flow channel 16, the distance between the inner wall surface 30 and the outer wall surface 32 gradually decreases from the upstream side to the downstream side in the fluid flow direction. In the constricted flow passage 16, the inner wall surface 30 and the outer wall surface 32 change positions in the direction from the inner wall surface 30 to the outer wall surface 32 from the upstream side to the downstream side in the fluid flow direction. The inner wall surface 30 includes a straight portion 34 parallel to the extending direction of the louvers 20 and a curved portion 36 curved from the extending direction of the louvers 20 to the extending direction of the flow path 12 . The inner wall surface 30 is connected in the order of the louver 14 , the straight portion 34 , the curved portion 36 and the flow path 16 . The outer wall surface 32 includes a curved portion 38 curved in a direction along the extending direction of the flow path 12 from the extending direction of the blade plate 20 and a straight portion 39 parallel to the extending direction of the flow path 12 . The outer wall surface 32 is connected in the order of the louver 14 , the curved portion 38 , the straight portion 40 and the flow path 16 . The curved portion 36 and the curved portion 38 of the present embodiment are curved surfaces having the same shape.

The flow path mechanism 10 has a louver 14 arranged upstream of the flow path 12 and connects the flow path 12 and the louvers 14 with a contraction flow path 16 . In the flow path mechanism 10, the fluid on the upstream side of the louvers 14 flows into the louvers 14 in the flow direction 50, flows between the blades 20 of the louvers 14 in the flow direction 52 along the blades 20, and forms a contraction flow. After passing through channel 16 , it flows in flow direction 54 in channel 12 . In the flow path mechanism 10 , the fluid that has passed through the louvers 14 in the flow direction 52 changes its flow direction in the constricted flow path 16 to flow in the flow direction 54 .

In the contracted flow passage 16 of the present embodiment, the straight portion 34 of the inner wall surface 30 is oriented along the blade 20, and the straight portion 40 of the outer wall surface 32 is oriented in the same direction as the flow passage 12. On the other hand, the side of the inner wall surface 30 is reduced, resulting in a shape in which the opening area on the downstream side is smaller than that on the upstream side (one-sided drawing shape). As a result, when the width of the flow path 12 is W _out and the width of the upstream end of the contraction flow path 16 (the width of the downstream end of the louver 14 ) is W _in , _Win > _Wout .

By providing the constricted flow passage 16 , the flow passage mechanism 10 can reduce the difference between the flow passage area of the region where the louver 14 is arranged and the flow passage area of the flow passage 12 . In addition, the flow path mechanism 10 is provided with the constricted flow path 16 , so that the flow direction changes at the upstream end of the constricted flow path 16 , that is, at the downstream end of the louver 14 . By eliminating the , it is possible to reduce the turbulence of the flow caused by the increase in the flow passage area, and to reduce the pressure loss. Since the pressure loss of the flow path mechanism 10 can be reduced, more fluid can be passed efficiently (with less energy).

In addition, as in the present embodiment, the inner wall surface 30 side, which is the wall surface in the direction in which the fluid that has passed through the louvers 14 moves away, is narrowed, that is, the angle change with the louvers 14 is small. As described above, separation of the flow from the inner wall surface 30 can be suppressed, and pressure loss can be reduced. In addition, as in the present embodiment, by forming at least a part of the contracted flow passage 16 with a curved cross section, it is possible to change the flow direction while forming a flow along the wall surface. This can suppress the occurrence of peeling.

Here, the angle formed by the extending direction of the end of the constricted flow channel 16 on the louver 14 side with respect to the extending direction of the flow channel 12 (the direction parallel to the wall surface of the flow channel 12) is defined as θ1, and the flow channel When the inclination angle formed by the extending direction of the end portion of the blade 20 on the side of the constricted flow passage 16 with respect to the extending direction of the blade 20 is θ2, it is preferable to satisfy −30°≦θ1−θ2≦30°. . By setting the angle difference at the connecting position between the louver 14 and the constricted flow passage 16 within the above range, the pressure loss of the fluid can be reduced. In addition, it is preferable that the difference between the inclination angle θ1 and the inclination angle θ2 is small.

The flow path mechanism 10 has W _out as the width of the flow path 12 , W _in as the width of the upstream end of the contraction flow path 16 , t as the thickness of the louver 14 , and N as the number of blades 20 of the louver 14 . In this case, it is preferable that W _out ≦W _in −t×0.8×N. As a result, the flow channel area can be appropriately reduced in the constricted flow channel 16, and the occurrence of separation can be suppressed.

FIG. 2 is a diagram showing a modification of the first embodiment. The channel mechanism 10a shown in FIG. Here, the louver 14 and the flow path 12 are the same as the parts of the flow path mechanism 10 shown in FIG. 1, so the description thereof is omitted.

The contracted flow passage 16a includes an inner wall surface 30a and an outer wall surface 32a in the cross section shown in FIG. The outer wall surface 32a includes a curved portion 38 and a straight portion 40, similar to the contracted flow passage 16. As shown in FIG. The inner wall surface 30a includes a straight portion 34a and a curved portion 36a. The straight portion 34 a is arranged upstream of the constricted flow passage 16 a and connected to the louver 14 . The straight portion 34a is inclined in the same direction as the louvers 20 of the louver 14. As shown in FIG. The curved portion 36 a connects the straight portion 34 a and the channel 12 . The curved portion 36 a includes a first curved portion 42 and a second curved portion 44 . The first curved portion 42 connects the straight portion 34 a and the second curved portion 44 . The second curved portion 44 connects the first curved portion 42 and the flow path 12 . The first curved portion 42 and the second curved portion 44 are connected at an inflection point 46 . That is, the curved portion 36a changes its unevenness with respect to the space in which the fluid flows at the inflection point 46 . The first curved portion 42 is concave with respect to the space through which the fluid flows. The second curved portion 44 is convex with respect to the space through which the fluid flows.

In this manner, the flow path mechanism 10a may have a structure in which the curved portion 36a of the inner wall surface 30a is a combination of a plurality of curved lines.

[Second embodiment]
FIG. 3 is a schematic diagram showing a channel mechanism of the second embodiment. The channel mechanism 10b shown in FIG. 3 has a flow guide 60 arranged in the channel mechanism 10a. In the flow path mechanism 10b, the structures similar to those of the flow path mechanism 10a are denoted by the same reference numerals, and detailed description thereof is omitted. A channel mechanism 10b shown in FIG.

The flow guide 60 is arranged inside the contracted flow channel 16a in the direction of fluid flow. The flow guide 60 is a plate-like member whose longitudinal direction is the flow direction of the fluid. A plurality of flow guides 60 of this embodiment are arranged in a direction perpendicular to the flow direction of the fluid, like the blades 20 of the louver 14 . A plurality of flow guides 60 of the present embodiment are arranged at equal intervals in a direction perpendicular to the flow direction of the fluid. The flow guide 60 has a curved shape along the direction of flow of the fluid in the constricted flow channel 16a, that is, a shape curved from a direction parallel to the longitudinal direction of the blade plate 20 to a direction parallel to the extending direction of the flow channel 12. is.

By arranging the flow guide 60, the flow path mechanism 10b can change the flow direction of the fluid by the flow guide 60, and the change in the flow direction of the fluid that occurs in the contraction flow path 16 can be performed with less pressure loss. be able to. In addition, it is possible to further reduce the occurrence of fluid separation in the constricted flow passage 16 .

In the flow path mechanism 10b, the distance between the downstream end of the louver 14 and the upstream end of the flow guide 60 in the extending direction of the blades 20 is dL, and the distance between the adjacent blades 20 is When p, it is preferable that dL≧0.5×p. By arranging the flow guide 60 at a position that satisfies the above range, the fluid that has passed through the louver 14 is prevented from reaching the flow guide 60 immediately after reaching the contracted flow channel 16 and the flow channel area greatly changing. Therefore, it is possible to suppress an increase in pressure fluctuation in the constricted flow passage 16a. Also, the pressure loss caused by the flow guide 60 can be reduced.

It is preferable that the downstream end of the flow guide 60 be the downstream end of the constricted flow path 16a in the fluid flow direction. This allows the flow guide 60 to guide the flow along the flow path 12 . In addition, it is possible to reduce the fluctuation of the opening area in the constricted flow passage 16a, thereby reducing the pressure loss.

It is preferable that the flow guide 60 has an inclination angle of the downstream end with respect to the direction in which the flow path 12 extends, parallel to the direction in which the flow path 12 extends. Thereby, pressure loss can be made smaller.

The flow guide 60 has an inclination angle of θ3 formed by the direction in which the upstream end extends with respect to the direction in which the flow passage 12 extends, and the angle of inclination of the flow guide 60 on the side of the contracted flow passage 16 a of the blade plate 20 with respect to the direction in which the flow passage 12 extends. It is preferable that -10°≦θ3−θ2≦10° be satisfied, where θ2 is the inclination angle formed by the extending directions of the ends. By forming the flow guide 60 within the above range, separation of the fluid on the wall surface of the flow guide 60 can be suppressed.

In the flow path mechanism 10b, the flow guide 60 is arc-shaped and has a rectangular cross-sectional shape, but is not particularly limited to this configuration. The flow guide 60 may be arc-linear, airfoil or other curved shape. In addition, it is preferable that the flow guide 60 has a rectangular end on the downstream side. The shape of the upstream end of the flow guide 60 is not particularly limited, and may be cylindrical or acute.

The flow guides 60 may vary in pitch within the constricted flow passage 16a. At this time, it is preferable that the pitch of the inner wall surface 30a of the constricted flow passage 16a is narrower than the pitch of the outer wall surface 32 thereof. As a result, it is possible to appropriately control the flow of fluid on the side of the inner wall surface 30a where separation is likely to occur, and reduce pressure loss. Also, the number of flow guides 60 is not particularly limited, and the effect can be obtained by arranging at least one.

In addition, as shown in FIG. 4, the flow guide 60 of the present embodiment is located at a position that does not overlap with the extension line of the louver 20, that is, at a position that does not overlap with the louver 20 in the arrangement direction of the louver 20. placed in Thereby, the effect of guiding the fluid in the flow guide 60 can be obtained more preferably. The flow guide 60 is preferably placed at the position shown in FIG. 4 in order to obtain the above effect, but the flow guide 60a may be arranged on the extension line of the louver 14 as shown in FIG.

As described above, the flow path mechanism 10 includes the flow path 12 through which the fluid passes, and the plurality of blades disposed upstream of the flow path 12 and inclined in the same direction with respect to the direction in which the flow path 12 extends. 20 connects the louvers 14 arranged in a row in a direction orthogonal to the extending direction of the flow channel, the end of the louver 14 on the flow channel 12 side, and the end of the flow channel 12 on the louver 14 side. and a constricted flow passage 16 whose opening area decreases from the louver 14 toward the flow passage 12. - 特許庁

According to this configuration, it is possible to suppress the fluctuation of the flow path area and the separation of the flow when passing through the flow path mechanism 10 . Therefore, pressure loss and flow drift can be reduced.

At least a part of the wall surface of the contracted flow passage 16 curves from the direction in which the blade extends toward the direction in which the flow passage extends. Thereby, separation of the flow can be further suppressed.

The constricted flow passage 16 is composed of curves and straight lines that smoothly connect the wall surface in a cross section in the direction in which the blade plate 20 is inclined with respect to the direction in which the flow passage 12 extends. Thereby, separation of the flow can be further suppressed.

When viewed from the inside of the channel, the contracted flow channel 20 has a wall surface (inner wall surface) where the angle formed by the blade and the channel is 180 degrees or more. The wall surface (outer side) where the angle formed by the blade and the channel is less than 180 degrees has a curve on the louver side. Thereby, separation of the flow can be further suppressed.

If W _out is the width of the flow path, W _in is the width of the upstream end of the constricted flow path, t is the thickness of the blade, and N is the number of blades of the louver, then W _out ≦W _in −t×0.8×N is satisfied. This can reduce variations in the opening area.

Let θ1 be an inclination angle formed by the extending direction of the louver-side end portion of the constricted flow channel with respect to the extending direction of the flow channel, and the constricted flow of the blade plate with respect to the extending direction of the flow channel. If the inclination angle formed by the extending direction of the roadside edge is θ2, −30°≦θ1−θ2≦30° is satisfied. The opening angle between the wall and the flow can be reduced. Therefore, the Coanda effect makes it difficult for the flow to separate, and pressure loss and flow drift can be reduced.

A flow guide is provided inside the constricted flow channel and extends from the louver toward the flow channel. This allows the flow guide 60 to reduce the local flow turning angle. Therefore, local flow separation can be suppressed, and pressure loss and flow drift can be reduced. In addition, by installing the flow guide 60, the dimension (representative dimension) that affects the flow downstream of the channel becomes small, and the length of the channel can be relatively reduced. Therefore, the flow path can be made compact.

The upstream end of the flow guide is arranged between the blades in a direction orthogonal to the extending direction of the blades. Thereby, pressure loss can be reduced.

In the flow guide, when p is the distance between adjacent blades and dL is the distance between the downstream end of the blade and the upstream end of the flow guide in the direction in which the blade extends, dL ≧0.5×p. As a result, the loss of bending downstream of the louver 12 can be reduced.

The flow guide has an inclination angle of θ3 formed by the direction in which the upstream end extends with respect to the direction in which the flow channel extends, Assuming that the inclination angle formed by the extending directions of the ends is θ2, −10°≦θ3−θ2≦10° is satisfied. Thereby, peeling can be suppressed.

REFERENCE SIGNS LIST 10 channel mechanism 11 suction port 12 channel 14 louver 16 contraction channel 20 blade plate 30 inner wall surface 32 outer wall surface 34, 40 straight portions 36, 38 curved portions
50, 52, 54 flow direction 60 flow guide

Claims (10)

a channel through which the fluid passes;
A louver in which a plurality of louvers arranged upstream of the flow channel and inclined in the same direction with respect to the direction in which the flow channel extends are arranged in a row in a direction perpendicular to the direction in which the flow channel extends. and,
a contraction flow channel connecting an end of the louver on the flow channel side and an end of the flow channel on the louver side and having an opening area that decreases from the louver toward the flow channel. mechanism. 2. The flow path mechanism according to claim 1, wherein at least a part of a wall surface of the constricted flow path curves from the direction in which the blade extends toward the direction in which the flow path extends. 3. The contracting flow path according to claim 1 or 2, wherein, in a cross section in the direction in which the blades are inclined with respect to the direction in which the flow path extends, the wall surface is composed of curved lines and straight lines that are smoothly connected. flow path mechanism. In the constricted flow channel, a wall surface where the angle formed by the blade plate and the flow channel is 180 degrees or more when viewed from the inside of the flow channel has a curve on the flow channel side,
4. The flow path mechanism according to claim 3, wherein a wall surface having an angle of less than 180 degrees between the louver and the flow path when viewed from the inside of the flow path has a curve on the louver side. If W _out is the width of the flow path, W _in is the width of the upstream end of the constricted flow path, t is the thickness of the blade, and N is the number of blades of the louver, then W _out 5. The flow path mechanism according to claim 1, wherein ≦W _in −t×0.8×N is satisfied. Let θ1 be an inclination angle formed by the extending direction of the louver-side end portion of the constricted flow channel with respect to the extending direction of the flow channel, and the constricted flow of the blade plate with respect to the extending direction of the flow channel. The flow path mechanism according to any one of claims 1 to 5, wherein -30° ≤ θ1 - θ2 ≤ 30° is satisfied, where θ2 is the inclination angle formed by the extending direction of the roadside end. . 7. The flow path mechanism according to any one of claims 1 to 6, further comprising a flow guide disposed inside said contracted flow path and extending from said louver toward said flow path. 8. The flow path mechanism according to claim 7, wherein the upstream end of the flow guide is arranged between the blades in a direction orthogonal to the extending direction of the blades. In the flow guide, when p is the distance between adjacent blades and dL is the distance between the downstream end of the blade and the upstream end of the flow guide in the direction in which the blade extends, dL 8. The flow path mechanism according to claim 7, wherein ≧0.5×p is satisfied. The flow guide has an inclination angle of θ3 formed by the direction in which the upstream end extends with respect to the direction in which the flow channel extends, 10. The flow path mechanism according to claim 7, wherein −10°≦θ3−θ2≦10° is satisfied, where θ2 is an inclination angle formed by the extending direction of the end portion.

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