Fluid Transport Device

Abstract

To provide a fluid transport device which suppresses an induction effect and suppresses discomfort caused by a wind pressure.SOLUTION: A fluid transport device comprises: a cylindrical nozzle part 4 including a first ejection port 3 from which air-conditioning air is ejected, and a base 5 to which the nozzle part 4 is mounted and of which the inner diameter is reduced toward the nozzle part 4. The base 5 includes a plurality of second ejection ports 6 enclosing a mounted portion of the nozzle part 4 in a circumferential direction, and a crosspiece part 9. An auxiliary flow 8 ejected from the second ejection ports 6 is confluent with an induction air flow 10 generated by the crosspiece part 9 between openings of the second ejection ports 6 and becomes an annular flow 21 at a lower wind velocity than that of a main flow 7, such that a shear force caused by a velocity difference between the main flow 7 and an ambient fluid can be reduced by the annular flow 21, and the ambient fluid can be suppressed from being induced by an induction effect. Further, an opening area is widened by providing the second ejection ports 6 on the base 5. Thus, the wind velocities of the main flow 7 and the auxiliary flow 8 are suppressed, thereby suppressing discomfort caused by a wind pressure.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fluid transport device for efficiently transporting a fluid such as air for purposes such as heating and cooling. [Background technology]

[0002] When cooling or heating large spaces such as factories, warehouses, stadiums, and commercial kitchens, a fluid ejection nozzle 101 as shown in Fig. 7 is used as an outlet structure for making air-conditioned air reach a target location in a spot-like manner. In this fluid ejection nozzle 101, a circular opening 103 is formed in an air-conditioning duct 102, a brim-shaped member 104 is fixed to the opening 103, and a fixing member 105 having a side portion formed in an R-shape is fixed to the brim-shaped member 104. A nozzle main body 106 (ball portion) having a substantially semicircular shape is disposed within the fixing member 105 so as to be movable in any direction through its central axis, and the lower end side of the nozzle main body 106 has a cylindrical blowing portion 107. With this configuration, air-conditioned air can be blown out in a spot-like manner in any direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-73442 Summary of the Invention [Problem to be solved by the invention]

[0004] In such a fluid ejection nozzle 101, when conditioned air A is blown out from the blowing portion 107, surrounding ambient air B is attracted near the blowing portion 107. For example, in the case of cooling operation in summer, the ambient air B is hotter than the conditioned air A for cooling blown out from the blowing portion 107, and this hot air reaches the place to be cooled due to the induction effect, reducing the cooling effect. Similarly, in the case of heating operation in winter, the ambient air B, which is colder than the conditioned air A for heating blown out from the blowing portion 107, reaches the place to be heated due to the induction effect, reducing the heating effect.

[0005] Furthermore, in the case of such a fluid jet nozzle 101, when the conditioned air A reaches the place to be cooled, the jet may hit a person directly, causing discomfort due to the sense of wind pressure caused by the flow speed and wind noise around the ears. In addition, in the case of air conditioning in a factory, for example, if there are manufactured products, manufacturing equipment, liquids, etc. that should be avoided from being affected by the wind pressure at the point where the jet reaches, other fluid transport means is required.

[0006] Also, in the case of a stratified air-conditioning system, which is another fluid transport means, the problems associated with the wind pressure of the fluid ejection nozzle 101 described above can be solved. However, in the case of a stratified air-conditioning system, when a transient change in pressure occurs in the space, for example, when a shutter of a factory is opened, the gas remaining in the living area flows out. In that case, there is a problem that a loss of time and energy occurs until the temperature and humidity become appropriate again.

[0007] The present invention is devised to solve such conventional problems, and aims to provide a fluid transport device that can suppress the attraction effect, transport fluid efficiently, and minimize discomfort caused by wind pressure. [Means for solving the problem]

[0008] In order to achieve this object, the fluid transport device of the present invention has a cylindrical nozzle portion provided with a first outlet for ejecting conditioned air that is a main stream, and a base to which the nozzle portion is attached and whose inner diameter is reduced toward the nozzle portion,The inner peripheral side surface and the outer peripheral side surface of the nozzle portion have a tapered shape expanding from the base side toward the first jet outlet, The base has a plurality of second nozzles and a crosspiece that circumferentially surround the mounting portion of the nozzle portion. The second nozzles eject a secondary flow along the outer circumferential side surface of the nozzle portion, and the secondary flow attracts the surrounding fluid to the pier portion between the second nozzles to generate an induced airflow. The configuration achieves the intended purpose. Effect of the Invention

[0009] According to the present invention, the jet from the second nozzle is ejected along the outer peripheral side surface of the nozzle portion, forming a secondary flow. This secondary flow merges with the induced air flow generated by the lattice between the openings of the second nozzle, forming an annular flow that covers the main flow ejected from the first nozzle. This annular flow has a slower wind speed than the main flow. The annular flow reduces the shear force caused by the speed difference between the main flow and the surrounding fluid, and suppresses the drawing of the surrounding fluid due to the induced effect, so that the wind speed of the main flow and the secondary flow can be suppressed. Therefore, by creating a difference in ejection speed between the two nozzles, the drawing of the surrounding fluid can be suppressed, and the conditioned air can be transported far away while suppressing the wind speed, making it possible to create a comfortable air-conditioned space that minimizes discomfort caused by the wind pressure of the fluid. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing a configuration of a fluid transporting device according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is an enlarged cross-sectional view showing a configuration of a fluid transporting device according to a first embodiment of the present invention. [Diagram 3] A cross-sectional view showing the change in velocity distribution of a jet of a conventional fluid transport device. [Figure 4] FIG. 11 is a cross-sectional view showing a change in the velocity distribution of a jet according to the first embodiment of the present invention. [Diagram 5] FIG. 11 is an enlarged cross-sectional view showing the configuration of a fluid transporting device according to a second embodiment of the present invention. [Figure 6] FIG. 11 is an enlarged cross-sectional view showing the configuration of a fluid transporting device according to a third embodiment of the present invention. [Figure 7] FIG. 1 is an explanatory diagram showing the configuration of a conventional fluid transport device; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The fluid transport device of the present invention has a cylindrical nozzle portion having a first outlet for spraying conditioned air, and a base to which the nozzle portion is attached and whose inner diameter decreases toward the nozzle portion, and the base has a plurality of second outlets and crosspiece portions circumferentially surrounding the attachment portion of the nozzle portion.

[0012] With this configuration, the jet from the second nozzle is ejected along the outer peripheral side surface of the nozzle portion, and becomes a side stream ejected along the first nozzle. This side stream merges with the induced air flow generated by the lattice between the openings of the second nozzle, and becomes an annular flow with a wind speed slower than the main stream. This annular flow can reduce the shear force caused by the speed difference between the main stream and the surrounding fluid, making it possible to suppress the drawing-in of the surrounding fluid due to the induction effect. In addition, by providing the second nozzle, the opening area of ​​the entire device can be secured to be large, and the wind speed of the main stream and the side stream can be suppressed. Therefore, by creating a difference in ejection speed between the two nozzles, it is possible to suppress the induction of the surrounding fluid and to transport the conditioned air to a long distance while suppressing the wind speed, so that a comfortable air-conditioned space can be provided with as little discomfort caused by the wind pressure of the fluid as possible.

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] (Embodiment 1) As shown in Fig. 1, a fluid transporting device 1 of the first embodiment is connected to an air conditioning duct 2. That is, in this embodiment, the fluid transporting device 1 serves as an outlet for conditioned air. As shown in the enlarged cross-sectional view of the fluid transporting device 1 in Figure 2, the fluid transporting device 1 has a cylindrical nozzle portion 4 having a first nozzle 3 for spraying conditioned air, a substantially hemispherical base 5 to which the nozzle portion 4 is attached, and a plurality of second nozzles 6 around the vicinity of the nozzle attachment portion of the base 5.

[0015] As shown in FIG. 1, second nozzles 6 and crosspieces 9 are alternately arranged around the attachment portion between nozzle portion 4 and base 5 in the circumferential direction.

[0016] The secondary flow 8 ejected from the second nozzle 6 is ejected so as to follow the outer peripheral side surface of the nozzle portion 4. The secondary flow 8 generates an induced air flow 10 at the crosspiece 9 between the openings of the second nozzle 6. The induced air flow 10 merges with the secondary flow 8 and is ejected so as to cover the main flow 7 ejected from the first nozzle 3 (annular flow 21). The induced air flow 10 merges with the secondary flow 8, and the annular flow 21 has a slower wind speed than the main flow 7.

[0017] Fig. 3 is an explanatory diagram of the blowing wind speed according to the conventional technology, and is an explanatory diagram showing the change in velocity distribution when conditioned air is ejected as a jet flow with a cross-sectional average velocity U0 from a single-nozzle (single-layer nozzle) fluid ejection nozzle 101. Fig. 4 is an explanatory diagram showing the change in velocity distribution when conditioned air is ejected as a main flow 7 (main flow cross-sectional average velocity Us) from a first ejection port 3 of a nozzle portion 4 and as a side flow 8 (side flow cross-sectional average velocity Uf) from a second ejection port 6 in the fluid transport device 1 of this embodiment.

[0018] As shown in Fig. 3, when conditioned air is ejected from the fluid ejection nozzle 101 of the prior art, the speed U0 is uniformly distributed at distance Z = 0, but at the boundary between the conditioned air and the surrounding air B, an attraction effect occurs due to the speed difference, and the conditioned air is transported while entraining the surrounding air B. This effect progresses as it travels downstream, and the speed of the conditioned air gradually decreases from the outside, and the temperature of the conditioned air is affected by the surrounding temperature. For example, in the case of cooling operation in the summer, the conditioned air is warmed by the surrounding high-temperature fluid, decreasing the cooling performance, and in the case of heating operation in the winter, the conditioned air is cooled by the surrounding low-temperature fluid, decreasing the heating performance.

[0019] As shown in FIG. 4, in the case of the fluid conveying device 1 of the present embodiment, the side flow 8 is ejected along the outer circumference of the main flow 7, but the side flow 8 merges with the induced air flow 10 generated at the crosspiece 9 to become the annular flow 21 whose wind speed is slower than that of the main flow 7. At this time, as in the conventional fluid ejection nozzle 101, an induction effect occurs at the boundary between the annular flow 21 and the ambient air B due to the speed difference. Due to this induction effect, the annular flow 21 is conveyed while entraining the ambient air B. However, since the wind speed of the annular flow 21 is slower due to the merger with the induced air flow 10, the speed difference between the air-conditioned air and the ambient air B is smaller than in the case of the conventional fluid ejection nozzle 101, and the induction effect of the ambient air B can be suppressed. Furthermore, since the main flow 7 is covered by the annular flow 21, the induction effect of the ambient air B can be suppressed, and the deterioration of the performance of the cooling operation in summer and the heating operation in winter can be suppressed. Furthermore, by providing the second nozzle 6 on the base, a wide opening area of ​​the entire device can be ensured, and the wind speeds of the main flow 7 and the side flow 8 can be reduced.

[0020] This allows the annular flow 21 to transport conditioned air to a long distance through the main stream 7 while reducing the wind speed of the main stream 7 and the annular flow 21 that annularly surrounds the main stream 7. This makes it possible to suppress discomfort caused by the direct impact of the jet or wind noise around the ears. This is also effective in air conditioning in a factory, for example, when there are manufactured products, manufacturing equipment, liquids, etc. that should be avoided from being affected by the wind pressure at the point where the jet reaches.

[0021] The base 5 may be in the shape of a truncated cone with a radius that decreases toward the nozzle portion 4. In this case, the nozzle portion 4 is provided protruding from the apex of the truncated cone, and the second ejection port 6 is provided adjacent to the apex of the truncated cone.

[0022] (Embodiment 2) As shown in FIG. 5, the fluid conveyance device 1b of the second embodiment includes a cylindrical nozzle portion 4 provided with a first jet outlet 3 for jetting conditioned air, a substantially hemispherical base 5 to which the nozzle portion 4 is attached, and a plurality of second jet outlets 6 provided in the vicinity of the nozzle attachment portion of the base 5. As a feature of the present embodiment, the cylindrical nozzle portion 4 has a tapered shape.

[0023] In the present embodiment, by making the nozzle portion 4 tapered, the jet area of the first jet outlet 3 becomes wider, and the wind speed of the main stream 7 can be suppressed. With this configuration, the attracting effect of the ambient air B can be further suppressed. Note that the tapered shape of the nozzle portion 4 preferably has an angle of 20° or less and a length of 200 mm or less.

[0024] (Embodiment 3) As shown in FIG. 6, the fluid conveyance device 1c of the third embodiment includes a cylindrical and tapered nozzle portion 4 provided with a first jet outlet 3 for jetting conditioned air, a substantially hemispherical base 5 to which the nozzle portion 4 is attached, and a plurality of second jet outlets 6 provided in the vicinity of the nozzle attachment portion of the base 5. As a feature of the present embodiment, the nozzle portion 4 has a first jet outlet a11 for jetting the main stream a14, a first jet outlet b12 formed in a ring shape so as to surround the outer peripheral portion of the first jet outlet a11 and jetting the main stream b15 as an annular jet, and a first jet outlet c13 formed in a ring shape so as to surround the outer peripheral portion of the first jet outlet b12 and jetting the main stream c16 as an annular jet. When the jet speed of the main stream a14 jet from the first jet outlet a11 is U1, the jet speed of the main stream b15 jet from the first jet outlet b12 is U2, and the jet speed of the main stream c16 jet from the first jet outlet c13 is U3, jets are ejected from the first jet outlet a11, the first jet outlet b12, and the first jet outlet c13 so that U2 becomes the largest, that is, U1 < U2 and U3 < U2. More preferably, the jets are ejected so that U2 > U1 > U3.

[0025] As described above, at the contact portion between the fast airflow and the slow airflow, a phenomenon occurs in which the slow airflow is attracted to the fast airflow. The amount of attraction increases as the speed difference increases. In the fluid transporting device 1 of this embodiment, as described above, the wind speed U2 of the main stream b15 is faster than the adjacent main stream c16 on the outer periphery side, that is, the attraction effect occurs by generating a speed difference at the boundary between the main stream b15 and the main stream c16. In addition, an attraction effect occurs at the boundary between the main stream c16 and the substream 8 due to the speed difference, and an attraction effect occurs at the boundary between the substream 8 and the ambient air B due to the speed difference. Due to this attraction effect, the main stream b15 is transported while entraining the main stream c16, the main stream c16 is transported while entraining the substream 8, and the substream 8 is transported while entraining the ambient air B. According to the blowing having such a configuration, the speed difference between the substream 8 and the ambient air B at the outermost periphery is smaller than the speed difference when the main stream b15 and the ambient air B directly contact each other, so that the attraction effect of the ambient air B can be suppressed. That is, the main flow b15 having the high wind speed U2 does not come into direct contact with the ambient air B, and the ambient air B is attracted to the secondary flow 8 having a low wind speed, thereby reducing the amount of attraction. In this way, it is possible to suppress the temperature rise of the conditioned air blown out from the nozzle portion 4 during cooling, or the temperature drop during heating, and to suppress the performance degradation of cooling operation in the summer and the performance degradation of heating operation in the winter.

[0026] Furthermore, by making the wind speed U2 of the mainstream b15 higher than the wind speed U1 of the mainstream a14, an attraction effect is also generated at the boundary between the mainstream b15 and the mainstream a14. That is, the mainstream b15 is transported while entraining the mainstream a14, which is the conditioned air. In addition, since the mainstream b15 has a fast wind speed U2, it can transport the conditioned air to a long distance. And the mainstream a14 surrounded by the mainstream b15 reaches a long distance while being attracted by the mainstream b15. In addition, since the mainstream a14 has a relatively slow wind speed U1, it is possible to suppress, for example, discomfort caused by the direct impact of the jet or the generation of wind noise around the ears. In addition, it is also effective in air conditioning in a factory, for example, when there are manufactured products, manufacturing equipment, liquids, etc. that should be avoided from being affected by the wind pressure at the point where the jet reaches. [Industrial Applicability]

[0027] The present invention can be used to transport fluids for purposes such as air conditioning. [Explanation of symbols]

[0028] 1 Fluid transport device 2. Air conditioning ducts 3 1st spout 4 Nozzle section 5 Base 6 2nd spout 7 mainstream 8 Sidestream 9 Cross section 10 Induced air currents 11 1st spout a 12 1st spout b 13 1st spout c 14 mainstream a 15 Mainstream b 16 mainstream c 21 Annular flow 101 Fluid ejection nozzle 102 Air conditioning duct 103 Opening 104 Flange-shaped member 105 Fixing member 106 Nozzle body 107 Speech bubble section A. Air-conditioned air B Ambient air

Claims

1. A cylindrical nozzle portion having a first outlet for blowing out the main stream of conditioned air; a base to which the nozzle portion is attached and whose inner diameter decreases toward the nozzle portion, an inner peripheral side surface and an outer peripheral side surface of the nozzle portion have a tapered shape expanding from the base side toward the first jet outlet, the base has a plurality of second ejection ports and a crosspiece portion that circumferentially surrounds the attachment portion of the nozzle portion, A fluid transport device in which the second nozzle ejects a secondary flow along the outer peripheral side surface of the nozzle portion, and the secondary flow attracts surrounding fluid to the crosspiece portion between the second nozzles to generate an induced airflow.

2. The fluid transporting device according to claim 1 , wherein the second ejection port and the crosspiece alternately surround the mounting portion of the nozzle portion in the circumferential direction.

3. 3. The fluid transport device according to claim 1, wherein the base is semi-spherical.

4. The nozzle portion is A first jet port a; a first jet outlet b formed in an annular shape on an outer circumferential side of the first jet outlet a so as to surround an outer circumferential side of the first jet outlet a and jetting a fluid as an annular jet; a first jet outlet c that is formed annularly adjacent to an outer periphery of the first jet outlet b so as to surround an outer periphery of the first jet outlet b and that jets out a fluid as an annular jet, The fluid transport device according to any one of claims 1 to 3, wherein when the flow velocities of the air blown out from the first nozzle a, the first nozzle b, and the first nozzle c are U1, U2, and U3, respectively, the air is ejected so that U2>U1 and U2>U3.

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