Fluid delivery device

Abstract

To provide a technique capable of elongating a distance enabling fluid delivered from an outflow port to maintain high flow speed in a fluid delivery device.SOLUTION: A fluid delivery device may include: a fluid passage having a delivery port for delivering fluid to the outside; a fluid transportation machine provided in the fluid passage and causing the fluid to flow toward the delivery port; and a fluid acceleration member disposed in the vicinity of the delivery port in the fluid passage. The fluid acceleration member may be configured to increase the flow speed of the fluid after the delivery from the delivery port, compared to the flow speed of the fluid in the delivery port.SELECTED DRAWING: Figure 12B

Description

[Technical Field]

[0001] SUMMARY Disclosed herein is technology related to fluid delivery devices. [Background technology]

[0002] Patent Document 1 discloses a fluid delivery device that includes a fluid passage having a delivery port for delivering a fluid to the outside, and a fluid transport machine that is provided in the fluid passage and causes the fluid to flow toward the delivery port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-139734 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional fluid delivery device, the flow rate of the fluid delivered from the delivery outlet decreases monotonically, so the distance over which the fluid delivered from the outlet maintains a high flow rate is short. This specification provides a technology that can extend the distance over which the fluid delivered from the outlet maintains a high flow rate in a fluid delivery device. [Means for solving the problem]

[0005] This specification discloses a fluid delivery device. The fluid delivery device may include a fluid passage having a delivery port for delivering a fluid to the outside, a fluid transport machine provided in the fluid passage and causing the fluid to flow toward the delivery port, and a fluid accelerating member disposed inside the fluid passage near the delivery port. The fluid accelerating member may be configured to increase the flow velocity of the fluid after being delivered from the delivery port compared to the flow velocity of the fluid at the delivery port. Note that the fluid referred to here may be a gas such as air or a liquid such as water. The fluid transport machine may also be a blower fan for moving a gas or a pump for moving a liquid.

[0006] In the above-described fluid delivery device, the fluid accelerating member is disposed inside the fluid passage near the delivery outlet, so that the flow velocity of the fluid after being delivered from the delivery outlet can be made higher than the flow velocity of the fluid at the delivery outlet, thereby making it possible to lengthen the distance over which the high flow velocity of the fluid delivered from the delivery outlet is maintained.

[0007] The upstream portion of the fluid acceleration member may have a streamlined contour.

[0008] In the above configuration, the fluid accelerating member can be disposed in the fluid passage without significantly increasing the pressure loss when the fluid flows through the fluid passage.

[0009] The downstream portion of the fluid acceleration member may have a contoured shape that is more inward than the streamlined shape.

[0010] In the above configuration, a negative pressure region is generated in the downstream portion of the fluid accelerating member, and the negative pressure can concentrate the flow along the fluid accelerating member, thereby extending the distance over which the fluid discharged from the discharge port maintains a high flow velocity.

[0011] The fluid acceleration member may have a cam tail shape with the downstream portion of a symmetrical airfoil truncated.

[0012] In the above configuration, the negative pressure region downstream of the fluid accelerating member is strengthened, further improving the flow converging effect, which increases the momentum of the fluid discharged from the discharge port immediately after the confluence of the flows, thereby enabling the distance over which a high flow velocity is maintained to be extended.

[0013] The fluid acceleration member may be configured such that the ratio of the maximum thickness of the symmetric airfoil to the chord length of the symmetric airfoil is in the range of 21% to 30%.

[0014] When a fluid accelerating member is provided in the fluid passage, the distance over which the fluid discharged from the delivery port maintains a high flow velocity can be increased, but the pressure loss when the fluid passes through the fluid passage increases, resulting in an increase in the energy consumed by the fluid transport machine. With the above configuration, the distance over which the fluid discharged from the delivery port maintains a high flow velocity can be increased without significantly increasing the pressure loss when the fluid passes through the fluid passage.

[0015] The fluid acceleration member may be configured such that the ratio of the length from the upstream end to the cutting end of the symmetric airfoil to the chord length of the symmetric airfoil is in the range of 65% to 90%.

[0016] The magnitude of the flow collecting effect due to the negative pressure region in the downstream portion of the fluid accelerating member varies depending on the length from the upstream end to the cut end of the symmetrical airfoil. With the above configuration, the flow collecting effect due to the negative pressure region in the downstream portion of the fluid accelerating member can be further enhanced.

[0017] The fluid accelerating member may be arranged so that the downstream end of the fluid accelerating member and the delivery surface of the delivery port are flush with each other.

[0018] If the fluid accelerating member is located upstream of the outlet and away from the outlet, the distance over which the fluid discharged from the outlet maintains a high flow velocity will be shortened. On the other hand, if the fluid accelerating member protrudes outward from the outlet, the fluid accelerating member may get in the way when the fluid delivery device is in use. With the above configuration, the fluid accelerating member does not get in the way when the fluid delivery device is in use, and the distance over which the fluid discharged from the outlet maintains a high flow velocity can be extended.

[0019] The fluid passage may further have a contracted flow section whose width decreases toward the outlet. At least a portion of the fluid acceleration member may be disposed within the contracted flow section.

[0020] With the above configuration, the fluid flowing through the fluid passage can easily flow along the surface of the fluid accelerating member, thereby increasing the distance over which the fluid discharged from the discharge port maintains a high flow velocity.

[0021] When the distance between the tip of a potential core region formed in the fluid after being discharged from the discharge port and the discharge port is x and the width of the discharge port is d, the configuration may be such that x / d is equal to or greater than 6. Note that in this specification, the term "potential core region" refers to a region where the flow velocity of the fluid after being discharged from the discharge port is equal to or greater than the flow velocity of the fluid at the discharge port.

[0022] Typically, in a configuration in which a fluid accelerating member is not disposed near the delivery port inside the fluid passage, x / d is lower than 6. In the above configuration, by disposing a fluid accelerating member near the delivery port inside the fluid passage and making x / d 6 or more, it is possible to lengthen the distance over which the fluid delivered from the delivery port maintains a high flow velocity.

[0023] The fluid may be air. The fluid transport machine may be a blower fan. The fluid delivery device may function as an air curtain device.

[0024] With the above configuration, in the air curtain device, the distance over which the air blown out from the blow-out port maintains a high flow velocity can be increased, thereby achieving high space-blocking capability.

[0025] The fluid passage may further have a suction port disposed opposite the delivery port and adapted to draw in fluid from the outside.

[0026] In the above configuration, the air sent out from the air outlet can be sucked in by the air inlet before it diffuses, thereby further improving the space blocking ability of the air curtain device. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram of a fluid delivery device 1. FIG. [Figure 2] 3 is a cross-sectional view of a straight portion 31a of a fluid passage 31. FIG. [Figure 3] FIG. 2 is a cross-sectional view of a fluid accelerating member 7. [Figure 4] 1 is a diagram showing a schematic diagram of a potential core region 20 in a fluid delivered from a delivery port 14 in a fluid delivery device 11 of the prior art. [Figure 5] 2 is a diagram schematically showing a potential core region 20 in the fluid delivered from the delivery port 4 in the fluid delivery device 1 according to the first embodiment. FIG. [Figure 6A] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 in the fluid delivery device 1 when the fluid accelerating member 7 is not provided. [Figure 6B] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of a fluid delivered from a delivery port 4 when a fluid accelerating member 7 of a certain shape is arranged in the fluid delivery device 1. [Figure 6C] 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 when a fluid accelerating member 7 having a different shape is arranged in the fluid delivery device 1. FIG. [Figure 6D]FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 when a fluid accelerating member 7 having yet another shape is disposed in the fluid delivery device 1. [Figure 7] 6A-6D are graphs summarizing the simulation results of FIGS. [Figure 8A] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 in the case where a fluid accelerating member 7 with a cut-off portion on the downstream side is disposed in the fluid delivery device 1. [Figure 8B] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 in the case where a fluid accelerating member 7 whose downstream portion is not cut is disposed in the fluid delivery device 1. [Figure 9] 8C is a graph summarizing the simulation results of FIGS. 8A and 8B. [Figure 10] 10 is a graph showing the relationship between the ratio ΔL / ΔP of the extension distance ΔL of the potential core region 20 to the increase in pressure loss ΔP, and the ratio of the maximum blade thickness 7b to the blade chord length 7a. [Figure 11] 10 is a graph showing the relationship between the ratio ΔL / ΔP of the extension distance ΔL of the potential core region 20 to the increase in pressure loss ΔP, and the ratio of the length 7c from the upstream end to the cut end to the chord length 7a. [Figure 12A] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 in the fluid delivery device 1 when the fluid accelerating member 7 is not provided. [Figure 12B] FIG. 10 is a diagram showing the results of a simulation of the flow velocity of the fluid delivered from the delivery port 4 when a fluid accelerating member 7 with an optimal shape is arranged in the fluid delivery device 1. DETAILED DESCRIPTION OF THE INVENTION

[0028] (Example) As shown in FIG. 1, a fluid delivery device 1 according to this embodiment includes a fluid transportation machine 2 and fluid passages 31 to .

[0029] The fluid transport machine 2 causes a fluid to flow from an inlet 2a to an outlet 2b. The upstream end of a fluid passage 32 is connected to the outlet 2b of the fluid transport machine 2. The upstream end of a fluid passage 31 is connected to the downstream end of the fluid passage 32. A straight portion 31a having an elongated, approximately rectangular parallelepiped shape is formed in the downstream portion of the fluid passage 31. A delivery outlet 4 is formed on the lower surface of the straight portion 31a. The delivery outlet 4 is an elongated, approximately rectangular opening that faces downward. The fluid flowing through the fluid passage 31 flows in the longitudinal direction of the straight portion 31a and also flows downward toward the delivery outlet 4, and is delivered to the outside through the delivery outlet 4. The downstream end of a fluid passage 34 is connected to the upstream end of the fluid passage 34. The upstream end of the fluid passage 34 is connected to the downstream end of the fluid passage 33. A straight portion 33a having an elongated, approximately rectangular parallelepiped shape is formed in the upstream portion of the fluid passage 33. An intake port 5 is formed on the upper surface of the straight portion 33a. The intake port 5 is an elongated, approximately rectangular opening that is disposed facing upward. Fluid that flows into the fluid passage 33 from the outside through the intake port 5 flows in the longitudinal direction of the straight portion 33a and then flows through the fluid passage 33. The intake port 5 is disposed opposite the delivery port 4.

[0030] In the fluid delivery device 1, when the fluid transport machine 2 is driven, an external fluid is sucked into the fluid passage 33 via the suction port 5, and the fluid flows from the fluid passage 33 to the fluid transport machine 2 via the fluid passage 34, and the fluid flows from the fluid transport machine 2 to the fluid passage 31 via the fluid passage 32, and the fluid is delivered from the fluid passage 31 to the outside via the delivery port 4. The delivery port 4 and the suction port 5 are arranged opposite to each other, so the fluid delivered from the delivery port 4 is sucked in from the suction port 5.

[0031] In this embodiment, the fluid delivered by the fluid delivery device 1 is air, and the fluid transport machine 2 is a blower fan that moves the air. The fluid delivery device 1 of this embodiment functions as an air curtain device.

[0032] Next, the configuration in the vicinity of the delivery port 4 will be described with reference to Figure 2. In the vicinity of the delivery port 4, the straight section 31a of the fluid passage 31 has a contraction section 6 whose width decreases toward the delivery port 4. In addition, in the vicinity of the delivery port 4, a fluid accelerating member 7 is arranged inside the fluid passage 31. The fluid accelerating member 7 is arranged in the contraction section 6 of the fluid passage 31.

[0033] By providing the flow contraction section 6 in the fluid passage 31, it is possible to reduce the flow path area of the fluid flowing toward the delivery port 4 and increase the flow rate of the fluid delivered from the delivery port 4. In addition, by providing the flow contraction section 6 in the fluid passage 31, it is possible to straighten the flow of the fluid and make it easier to flow along the surface of the fluid accelerating member 7.

[0034] By disposing the fluid accelerating member 7 inside the fluid passage 31, the flow path area of the fluid flowing toward the outlet 4 can be further reduced, and the flow rate of the fluid discharged from the outlet 4 can be further increased. In addition, the fluid passing around the fluid accelerating member 7 can be collected downstream of the fluid accelerating member 7. This makes it possible to extend the region (hereinafter also referred to as the potential core region) in which the fluid after being discharged from the outlet 4 can maintain a flow rate equal to or higher than the flow rate at which it was discharged from the outlet 4.

[0035] The fluid accelerating member 7 is disposed in the contracted flow section 6 of the fluid passage 31 so that its longitudinal central axis is perpendicular to the discharge surface of the discharge port 4. In addition, the downstream end of the fluid accelerating member 7 is disposed flush with the discharge surface of the discharge port 4. This allows the potential core region to be extended to the maximum extent possible without the fluid accelerating member 7 protruding beyond the discharge port 4 and becoming an obstacle.

[0036] Next, a specific shape of the fluid acceleration member 7 will be described with reference to FIG. 3. The fluid acceleration member 7 of this embodiment has a cam-tail shape in which the downstream portion of a symmetrical airfoil (e.g., a NACA airfoil) having a shape symmetrical with respect to a plane including the longitudinal center axis is cut off. The shape of the fluid acceleration member 7 is specified by its chord length 7a, maximum blade thickness 7b, and length 7c from the upstream end to the cut end. By making the fluid acceleration member 7 a cam-tail shape in which the downstream portion of a symmetrical airfoil is cut off, the negative pressure region generated in the cut region is confined by the converging fluid flow, thereby reducing pressure loss. In addition, the flow-collecting effect of the negative pressure region allows the potential core region to be extended.

[0037] Next, a comparison between the prior art and the technology disclosed in this embodiment will be described with reference to FIGS.

[0038] As shown in Figure 4, the conventional fluid delivery device 11 does not have a fluid accelerating member 7 disposed near the delivery port 14. In this case, the flow velocity of the fluid delivered from the delivery port 14 gradually decreases as it mixes with the surrounding fluid. As a result, the flow velocity of the fluid delivered from the delivery port 14 decreases monotonically, and the potential core region 20 becomes short.

[0039] In contrast, as shown in Fig. 5, in the fluid delivery device 1 according to this embodiment, a fluid accelerating member 7 is disposed near the delivery port 4. Therefore, the momentum of the fluid increases at the confluence G after the fluid passes through the fluid accelerating member 7, and the flow velocity of the fluid after being delivered from the delivery port 4 becomes higher than the flow velocity of the fluid at the delivery port 4. Therefore, the potential core region 20 in the fluid delivery device 1 according to this embodiment extends to a distance farther from the delivery port 4 than the potential core region 20 of the fluid delivery device 11 of the prior art shown in Fig. 4.

[0040] 6A to 6D, we will explain the results of a simulation to see how the flow velocity of the fluid delivered from the delivery port 4 in the fluid delivery device 1 changes depending on the presence and shape of the fluid accelerating member 7. In the simulation, the width of the delivery port 4 is set to 50 mm, and the flow velocity of the fluid flowing into the contraction section 6 is set to 0.33 m / s.

[0041] Figure 6A shows a simulation result S1 when no fluid accelerating member 7 is provided. Figure 6B shows a simulation result S2 when a NACA airfoil having a chord length 7a of 80 mm is used as the fluid accelerating member 7, the ratio of maximum blade thickness 7b to chord length 7a is 12%, and the ratio of length 7c from the upstream end to the cut end to chord length 7a is 75%. Figure 6C shows a simulation result S3 when a NACA airfoil having a chord length 7a of 80 mm is used as the fluid accelerating member 7, the ratio of maximum blade thickness 7b to chord length 7a is 12%, and the ratio of length 7c from the upstream end to the cut end to chord length 7a is 85%. FIG. 6D shows a simulation result S4 for a NACA airfoil having a chord length 7a of 80 mm as the fluid acceleration member 7, in which the ratio of the maximum blade thickness 7b to the chord length 7a is set to 18%, and the ratio of the length 7c from the upstream end to the cut end to the chord length 7a is set to 75%.

[0042] As can be seen from Figures 6A to 6D, compared to when the fluid accelerating member 7 is not provided (simulation result S1), when the fluid accelerating member 7 is provided (simulation results S2, S3, S4), the fluid discharged from the outlet 4 maintains a high flow velocity over a longer distance. Furthermore, compared to simulation result S2, simulation result S3 maintains a high flow velocity over a slightly longer distance. Furthermore, compared to simulation results S2 and S3, simulation result S4 maintains a high flow velocity over a longer distance.

[0043] Figure 7 is a graph summarizing the simulation results S1-S4, with the vertical axis representing the flow velocity Uc at the central axis of the fluid discharged from the discharge port 4 and the horizontal axis representing the ratio x / d of the distance x from the discharge port 4 to the width d of the discharge port 4. In the simulation results S1-S4, the flow velocity Uc at the discharge port 4 is 1 m / s, and therefore the locations where the flow velocity Uc is 1 m / s or greater correspond to the potential core region 20 (see Figure 5).

[0044] In the simulation result S1, the potential core region 20 is maintained up to x / d of 5.2, whereas in the other simulation results S2-S4, the potential core region 20 is maintained up to x / d of 8.8, 9.0, and 9.7, respectively. In other words, by placing the fluid acceleration member 7, the potential core region 20 can be extended up to approximately 1.69-1.87 times.

[0045] Furthermore, in simulation result S1, the flow velocity Uc reaches a maximum value of 1 m / s at the outlet 4 and monotonically decreases as the distance from the outlet 4 increases, whereas in simulation results S2-S4, the flow velocity Uc is lower than 1 m / s near the outlet 4, but increases as the distance from the outlet 4 increases, peaks, and then decreases. In simulation results S2-S4, the maximum value of the flow velocity Uc exceeds 1 m / s, and in simulation result S4 in particular, the maximum value of the flow velocity Uc is 1.15 m / s. In other words, by placing the fluid accelerating member 7, the flow velocity Uc can be increased by up to 1.15 times.

[0046] As described above, the potential core region 20 is extended by disposing the fluid accelerating member 7 in the vicinity of the delivery port 4. Therefore, particularly when the fluid delivery device 1 is used as an air curtain device, a high spatial isolation capability can be achieved.

[0047] 8A and 8B, a description will be given of the results of a simulation of how the flow rate of the fluid delivered from the delivery port 4 in the fluid delivery device 1 changes depending on whether or not the fluid accelerating member 7 is cut. Note that the simulation uses the same preconditions as those in FIGS. 6A to 6D.

[0048] 8A shows a simulation result S4 for a NACA airfoil having a chord length 7a of 80 mm as the fluid accelerating member 7, where the ratio of the maximum blade thickness 7b to the chord length 7a is 18% and the ratio of the length 7c from the upstream end to the cut end to the chord length 7a is 75%. FIG. 8B shows a simulation result S5 for a NACA airfoil having a chord length 7a of 80 mm as the fluid accelerating member 7, where the ratio of the maximum blade thickness 7b to the chord length 7a is 18% and the ratio of the length 7c from the upstream end to the cut end to the chord length 7a is 100%, i.e., where the fluid accelerating member 7 is an uncut NACA airfoil.

[0049] As can be seen from Figures 8A and 8B, when the fluid accelerating member 7 is a cut NACA airfoil (simulation result S4), the fluid discharged from the discharge port 4 maintains a high flow velocity over a longer distance than when the fluid accelerating member 7 is a non-cut NACA airfoil (simulation result S5).

[0050] 9, similar to FIG. 7, summarizes the simulation results S4 and S5 in a graph in which the vertical axis represents the flow velocity Uc at the central axis of the fluid discharged from the discharge port 4 and the horizontal axis represents the ratio x / d of the distance x from the discharge port 4 to the width d of the discharge port 4. Note that in the simulation results S4 and S5, the flow velocity Uc at the discharge port 4 is 1 m / s, and therefore the locations where the flow velocity Uc is 1 m / s or more correspond to the potential core region 20 (see FIG. 5).

[0051] In the simulation result S5, the potential core region 20 is maintained up to a point where x / d is 8.3, whereas in the simulation result S4, the potential core region 20 is maintained up to a point where x / d is 9.7. In other words, by forming the fluid acceleration member 7 into a truncated NACA airfoil shape, the potential core region 20 can be extended up to 1.17 times.

[0052] In addition, in the simulation result S5, the maximum value of the flow velocity Uc is 1.06 m / s, whereas in the simulation result S4, the maximum value of the flow velocity Uc is 1.15 m / s. In other words, by forming the fluid accelerating member 7 into a truncated NACA airfoil shape, the flow velocity Uc can be increased by approximately 1.08 times.

[0053] As described above, by forming the fluid accelerating member 7 in the cut NACA airfoil shape, the potential core region 20 is extended compared to when the fluid accelerating member 7 is formed in the uncut NACA airfoil shape. Therefore, particularly when the fluid delivery device 1 is used as an air curtain device, by forming the fluid accelerating member 7 in the cut NACA airfoil shape, a high space blocking capability can be achieved.

[0054] If a fluid accelerating member 7 is placed in the fluid passage 31, the distance over which the fluid discharged from the discharge outlet 4 maintains a high flow velocity can be increased, but the pressure loss when the fluid passes through the fluid passage 31 increases, resulting in an increase in the energy consumed by the fluid transport machine 2.

[0055] 10 is a graph summarizing the results of a simulation in which the ratio of the maximum blade thickness 7b to the blade chord length 7a is changed for ΔL / ΔP, where ΔL is the difference between the extension distance of the potential core region 20 when the fluid accelerating member 7 is arranged in the fluid passage 31 and the extension distance of the potential core region 20 when the fluid accelerating member 7 is not arranged in the fluid passage 31, and ΔP is the difference between the pressure loss when the fluid accelerating member 7 is arranged in the fluid passage 31 and the pressure loss when the fluid accelerating member 7 is not arranged in the fluid passage 31. Note that here, the ratio of the length 7c from the upstream end to the cut end of the fluid accelerating member 7 to the blade chord length 7a is fixed at 75%.

[0056] As shown in Figure 10, ΔL / ΔP forms an upward convex curve with a maximum value relative to the ratio of maximum blade thickness 7b to chord length 7a. The ratio of maximum blade thickness 7b to chord length 7a that maximizes ΔL / ΔP is 24%, and ΔL / ΔP can be made high within the nearby range of 21 to 30%.

[0057] Furthermore, since the flow collecting effect of the fluid accelerating member 7 is due to the negative pressure region generated in the cut region, the extension distance of the potential core region 20 also changes depending on the cut position in the fluid accelerating member 7.

[0058] Figure 11 is a graph summarizing the results of simulations conducted while changing the ratio of the length 7c from the upstream end to the cut end to the chord length 7a for the same ΔL / ΔP as in Figure 10. Note that here, the ratio of the maximum blade thickness 7b to the chord length 7a of the fluid acceleration member 7 is fixed at 24%.

[0059] As shown in Figure 11, ΔL / ΔP forms an upward convex curve with a maximum value relative to the ratio of the length 7c from the upstream end to the cut end to the chord length 7a. The ratio of the length 7c from the upstream end to the cut end to the chord length 7a that maximizes ΔL / ΔP is 85%, and ΔL / ΔP can be made high if it is in the nearby range of 65 to 90%.

[0060] As described above, in the fluid delivery device 1 of this embodiment, the best performance can be achieved when the shape of the fluid acceleration member 7 is optimized by setting the ratio of the maximum blade thickness 7b to the blade chord length 7a to 24% and the ratio of the length 7c from the upstream end to the cut end to the blade chord length 7a to 85%.

[0061] Fig. 12A shows a simulation result S1 in the case where no fluid accelerating member 7 is arranged, and Fig. 12B shows a simulation result S6 in the case where a fluid accelerating member 7 having an optimal shape is arranged.

[0062] As can be seen from Figures 12A and 12B, when a fluid accelerating member 7 with an optimal shape is placed (simulation result S6), the fluid discharged from the discharge port 4 maintains a high flow rate over a very long distance compared to when no fluid accelerating member 7 is placed (simulation result S1).

[0063] (Variation) The fluid delivered by the fluid delivery device 1 is not limited to air, but may be other gases or liquids such as water. Furthermore, the fluid may be a mixture of gas and liquid, or a multiphase fluid in which a small amount of solid is mixed with these.

[0064] The fluid transport machine 2 can be changed as appropriate depending on the type of fluid, and may be, for example, a pump.

[0065] The shapes and arrangements of the fluid passages 31, 32, 33, and 34 can be changed as appropriate depending on the application of the fluid delivery device 1. The fluid passages 31, 32, 33, and 34 may be passages made of metal or resin. Alternatively, the fluid passages 31, 32, 33, and 34 may be elastic passages made of rubber.

[0066] The shapes and arrangements of the delivery outlet 4 and the suction inlet 5 can be changed as appropriate depending on the application of the fluid delivery device 1. The delivery outlet 4 may have a circular delivery surface like a hose, for example. The delivery outlet 4 and the suction inlet 5 do not have to be arranged opposite each other.

[0067] The fluid delivery device 1 may not have the fluid passages 33, 34, and may not have the suction port 5. In this case, an external fluid may be sucked into the fluid transport machine 2 through the inlet 2a.

[0068] The chord length 7a, maximum blade thickness 7b, and length 7c from the upstream end to the cut end of the fluid accelerating member 7 may be changed as appropriate. The fluid accelerating member 7 does not have to be arranged in the contracted section 6 of the fluid passage 31 so that its longitudinal central axis is perpendicular to the discharge surface of the discharge port 4. In addition, the downstream end of the fluid accelerating member 7 does not have to be arranged so that it is flush with the discharge surface of the discharge port 4.

[0069] The fluid accelerating member 7 may have a streamlined contour shape other than a symmetrical airfoil shape. For example, the fluid accelerating member 7 may have a three-dimensional shape obtained by rotating the shape shown in Fig. 3 around the central axis.

[0070] As described above, in one or more embodiments, the fluid delivery device 1 includes fluid passages 31, 32, 33, 34 having a delivery port 4 for delivering the fluid to the outside, a fluid transport machine 2 provided in the fluid passage 31 and causing the fluid to flow toward the delivery port 4, and a fluid accelerating member 7 arranged inside the fluid passage 31 near the delivery port 4. The fluid accelerating member 7 is configured to increase the flow velocity of the fluid after being delivered from the delivery port 4 compared to the flow velocity of the fluid at the delivery port 4.

[0071] In the above-described fluid delivery device 1, the fluid accelerating member 7 is disposed in the vicinity of the delivery outlet 4 inside the fluid passage 31, so that the flow velocity of the fluid after being delivered from the delivery outlet 4 can be made higher than the flow velocity of the fluid at the delivery outlet 4. This makes it possible to lengthen the distance over which the fluid delivered from the delivery outlet 4 maintains a high flow velocity.

[0072] In one or more embodiments, the upstream portion of the fluid acceleration member 7 has a streamlined profile.

[0073] In the above configuration, the fluid accelerating member 7 can be disposed in the fluid passage 31 without increasing the pressure loss when the fluid flows through the fluid passage 31 too much.

[0074] In one or more embodiments, the downstream portion of the fluid acceleration member 7 has a contoured shape that is more inward than streamlined.

[0075] In the above configuration, a negative pressure region is generated in the downstream portion of the fluid accelerating member 7, and this negative pressure can concentrate the flow along the fluid accelerating member 7. This can increase the distance over which the fluid discharged from the discharge port 4 maintains a high flow velocity.

[0076] In one or more embodiments, the fluid acceleration member 7 has a kamm-tail shape in which the downstream portion of a symmetrical airfoil is truncated.

[0077] In the above configuration, the negative pressure region downstream of the fluid accelerating member 7 is strengthened, further improving the flow concentrating effect. This increases the momentum of the fluid at the confluence G after the fluid has passed through the fluid accelerating member 7, and the distance over which the fluid discharged from the discharge port 4 maintains a high flow velocity can be increased.

[0078] In one or more embodiments, the fluid acceleration member 7 is configured such that the ratio of the maximum symmetric airfoil thickness 7b to the symmetric airfoil chord length 7a is in the range of 21% to 30%.

[0079] If a fluid accelerating member 7 is disposed in the fluid passage 31, the distance over which the fluid discharged from the delivery port 4 maintains a high flow velocity can be increased, but the pressure loss when the fluid passes through the fluid passage 31 increases, resulting in an increase in the energy consumed by the fluid transport machine 2. With the above configuration, the distance over which the fluid discharged from the delivery port 4 maintains a high flow velocity can be increased without significantly increasing the pressure loss when the fluid passes through the fluid passage 31.

[0080] In one or more embodiments, the fluid acceleration member 7 is configured such that the ratio of the length 7c of the symmetric airfoil from the upstream end to the cutting end to the chord length 7a of the symmetric airfoil is in the range of 65% to 90%.

[0081] The magnitude of the flow collecting effect due to the negative pressure region in the downstream portion of the fluid accelerating member 7 varies depending on the length 7c from the upstream end to the cut end of the symmetrical airfoil shape. According to the above configuration, the flow collecting effect due to the negative pressure region in the downstream portion of the fluid accelerating member 7 can be further enhanced.

[0082] In one or more embodiments, the fluid accelerating member 7 is positioned so that the downstream end of the fluid accelerating member 7 and the outlet face of the outlet 4 are flush with each other.

[0083] If the fluid accelerating member 7 is positioned upstream of the outlet 4 and away from the outlet 4, the distance over which the fluid discharged from the outlet 4 maintains a high flow velocity will be shortened accordingly. On the other hand, if the fluid accelerating member 7 protrudes outward from the outlet 4, the fluid accelerating member 7 may get in the way when the fluid delivery device 1 is in use. With the above configuration, the fluid accelerating member 7 does not get in the way when the fluid delivery device 1 is in use, and the distance over which the fluid discharged from the outlet 4 maintains a high flow velocity can be lengthened.

[0084] In one or more embodiments, the fluid passage 31 further includes a flow contraction 6 whose width decreases toward the outlet 4. At least a portion of the fluid acceleration member 7 is disposed within the flow contraction 6.

[0085] With the above configuration, the fluid flowing through the fluid passage 31 can easily flow along the surface of the fluid accelerating member 7. This makes it possible to extend the distance over which the fluid discharged from the discharge port 4 maintains a high flow velocity.

[0086] In one or more embodiments, when the distance between the tip of the potential core region 20 formed in the fluid after being discharged from the discharge port 4 and the discharge port 4 is x and the width of the discharge port 4 is d, the configuration is such that x / d is 6 or greater.

[0087] Normally, in a configuration in which the fluid accelerating member 7 is not disposed near the delivery port 4 inside the fluid passage 31, x / d is lower than 6. In the above configuration, by disposing the fluid accelerating member 7 near the delivery port 4 inside the fluid passage 31 and making x / d 6 or more, the distance over which the fluid delivered from the delivery port 4 maintains a high flow velocity can be lengthened.

[0088] In one or more embodiments, the fluid is air, the fluid transport machine 2 is a blower fan, and the fluid delivery device 1 functions as an air curtain device.

[0089] In the above configuration, in the fluid delivery device 1 functioning as an air curtain device, the distance over which the air delivered from the delivery port 4 maintains a high flow velocity can be increased, thereby achieving high space isolation capability.

[0090] In one or more embodiments, the fluid passage 33 is disposed opposite the outlet 4 and further includes an inlet 5 for drawing in fluid from the outside.

[0091] In the above configuration, the air sent out from the delivery port 4 can be sucked in by the suction port 5 before it diffuses, thereby further improving the space blocking ability of the fluid delivery device 1 functioning as an air curtain device.

[0092] Although the embodiments have been described in detail above, they are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. The technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives alone has technical utility. [Explanation of symbols]

[0093] 1 :Fluid delivery device 2: Fluid transport machinery 2a:Inlet 2b: Outlet 4: Outlet 5: Inlet 6: Contraction section 7: Fluid acceleration member 7a: Chord length 7b: Maximum blade thickness 7c: Length from upstream end to cut end 11:Fluid delivery device 14: Outlet 20: Potential core region 31, 32, 33, 34: Fluid passage 31a, 33a: Straight section G: Confluence S1, S2, S3, S4, S5, S6: Simulation results

Claims

1. a fluid passage having a delivery port for delivering a fluid to the outside; a fluid transport machine provided in the fluid passage and causing the fluid to flow toward the delivery port; a fluid accelerating member disposed inside the fluid passage near the delivery port, the fluid accelerating member is configured to increase the flow velocity of the fluid after being discharged from the delivery port compared to the flow velocity of the fluid at the delivery port, an upstream portion of the fluid accelerating member having a streamlined contour; a downstream portion of the fluid accelerating member has a contour shape that is recessed inward from the streamlined shape, the fluid acceleration member has a cam tail shape in which the downstream portion of a symmetrical airfoil is cut off, The fluid delivery device, wherein the thickness of the symmetric airfoil at a cut end is less than the maximum thickness of the symmetric airfoil.

2. The fluid delivery device of claim 1 , wherein the fluid acceleration member is configured such that the ratio of the maximum thickness of the symmetric airfoil to the chord length of the symmetric airfoil is in the range of 21% to 30%.

3. 3. The fluid delivery device of claim 1, wherein the fluid acceleration member is configured such that the ratio of the length from the upstream end of the symmetric airfoil to the cutting end to the chord length of the symmetric airfoil is in the range of 65% to 90%.

4. The fluid delivery device according to claim 1 , wherein the fluid accelerating member is disposed so that a downstream end of the fluid accelerating member and a delivery surface of the delivery port are flush with each other.

5. The fluid passage further has a contracted portion whose width decreases toward the delivery port, The fluid delivery device of claim 1 , wherein at least a portion of the fluid accelerating member is disposed within the flow contraction.

6. 6. A fluid delivery device according to claim 1, wherein x / d is 6 or greater, where x is the distance between the tip of a potential core region formed in the fluid after being delivered from the delivery outlet and the delivery outlet, and d is the width of the delivery outlet.

7. the fluid is air, the fluid transport machine is a blower fan, The fluid delivery device of claim 1 , functioning as an air curtain device.

8. The fluid delivery device according to claim 7 , wherein the fluid passage further includes a suction port disposed opposite the delivery port and adapted to suck in the fluid from the outside.

Images