JP7620792B2 - Fluid Transport Device - Google Patents

Description

The present invention relates to a fluid transport device for efficiently transporting fluids such as air for purposes such as heating and cooling.

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 directing conditioned air to a target location. This fluid ejection nozzle 101 has a circular opening 103 formed in an air conditioning duct 102, a brim-shaped member 104 fixed to the opening 103, and a fixed member 105 with an R-shaped side portion fixed to the brim-shaped member 104. A substantially semicircular nozzle body 106 (ball portion) is disposed within the fixed member 105 so as to be movable in any direction through its central axis, and the lower end side of the nozzle body 106 has a cylindrical blowing portion 107. This configuration allows conditioned air to be blown out in a spot in any direction.

Japanese Utility Model Application Publication No. 5-73442

When conditioned air A is blown out from the blowing portion 107 in such a fluid ejection nozzle 101, it attracts the surrounding ambient air B near the blowing portion 107. For example, in the case of cooling operation in the 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 target area for cooling due to the attraction effect, reducing the cooling effect. Similarly, in the case of heating operation in the winter, the ambient air B, which is colder than the conditioned air A for heating blown out from the blowing portion 107, reaches the target area for heating due to the attraction effect, reducing the heating effect.

In addition, in the case of such a fluid ejection nozzle 101, when the conditioned air A reaches the location to be cooled, the jet may hit a person directly, for example, and the person may feel uncomfortable due to the wind pressure caused by the flow speed or the wind noise generated by 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 need to be avoided from being affected by the wind pressure at the point where the jet reaches, other fluid transport means are required.

In addition, 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 a stratified air conditioning system, when a transient change in pressure occurs in the space, for example when a shutter in a factory is opened, the gas remaining in the living area will flow out. In that case, there is a problem that time and energy are lost until the temperature and humidity become appropriate again.

The present invention aims to solve these problems and provide a fluid transport device that can efficiently transport fluid while suppressing the attraction effect, and minimize discomfort caused by wind pressure.

In order to achieve this objective, the fluid transport device of the present invention has a cylindrical nozzle section provided with a first outlet that sprays out mainstream conditioned air, and a base on which the nozzle section is attached and whose inner diameter decreases toward the nozzle section, the inner and outer circumferential sides of the nozzle section have a tapered shape expanding from the base side toward the first outlet, the base has a plurality of second outlets and a crosspiece portion that circumferentially surrounds the mounting portion of the nozzle section , the second outlets spray a secondary flow that flows along the outer circumferential side of the nozzle section, and the secondary flow attracts surrounding fluid toward the crosspiece portion between the second outlets to generate an induced air flow, thereby achieving the desired objective.

According to the present invention, the jet of air ejected 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 attraction of the surrounding fluid due to the attraction 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, it is possible to suppress the attraction of the surrounding fluid and transport the conditioned air to a long distance 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.

FIG. 1 is an explanatory diagram showing a configuration of a fluid transporting device according to a first embodiment of the present invention; 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; A cross-sectional view showing the change in velocity distribution of a jet of a conventional fluid transport device. 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. 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. 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. FIG. 1 is an explanatory diagram showing the configuration of a conventional fluid transport device;

The fluid transport device of the present invention has a cylindrical nozzle portion having a first outlet for ejecting 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 a crosspiece portion that circumferentially surrounds the attachment portion of the nozzle portion.

With this configuration, the jet from the second nozzle is ejected along the outer peripheral side of the nozzle, and becomes a side stream that is 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 slower wind speed 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 attraction of surrounding fluid due to the attraction effect. In addition, by providing a second nozzle, the opening area of the entire device can be secured widely, and the wind speed of the main stream and side stream can be suppressed. Therefore, by creating a difference in ejection speed between the two nozzles, it is possible to suppress the attraction of surrounding fluid and transport the conditioned air to a 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.

The following describes an embodiment of the present invention with reference to the drawings.

(Embodiment 1)
As shown in Fig. 1, a fluid transporting device 1 according to 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 provided with a first nozzle 3 for spraying conditioned air, a substantially hemispherical base 5 on 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.

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

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, so that the annular flow 21 has a slower wind speed than the main flow 7.

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

As shown in Figure 3, when conditioned air is ejected from the fluid ejection nozzle 101 of the prior art, it has a uniform distribution of speed U0 at distance Z = 0, but at the boundary between the conditioned air and the surrounding air B, an attraction effect occurs due to the difference in speed, 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, reducing the cooling performance, and in the case of heating operation in the winter, the conditioned air is cooled by the surrounding low-temperature fluid, reducing the heating performance.

As shown in FIG. 4, in the case of the fluid conveying device 1 of this embodiment, the side flow 8 is ejected along the outer periphery 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 merging 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. In addition, 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 cooling operation performance in summer and the heating operation performance in winter can be suppressed. In addition, by providing the second nozzle 6 on the base, the opening area of the entire device can be made large, and the wind speed of the main flow 7 and the side flow 8 can be reduced.

This allows the annular flow 21 to transport conditioned air over 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. It is also effective in air conditioning in factories, for example, when there are manufactured products, manufacturing equipment, liquids, etc. that should be avoided from being affected by wind pressure at the point where the jet reaches.

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 top of the truncated cone, and the second nozzle 6 is provided adjacent to the top of the truncated cone.

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

In this embodiment, the nozzle portion 4 is tapered to increase the ejection area of the first ejection port 3 and suppress the wind speed of the main flow 7. This configuration further suppresses the attraction effect of the surrounding air B. It is preferable that the tapered shape of the nozzle portion 4 has an angle of 20° or less and a length of 200 mm or less.

(Embodiment 3)
6, the fluid transport device 1c of the third embodiment has a cylindrical and tapered nozzle portion 4 provided with a first jet 3 for jetting conditioned air, a substantially hemispherical base 5 to which the nozzle portion 4 is attached, and a plurality of second jets 6 around the vicinity of the nozzle attachment portion of the base 5. As a feature of this embodiment, the nozzle portion 4 has a first jet a11 for jetting a main stream a14, a first jet b12 formed in an annular shape so as to surround the outer periphery of the first jet a11 and for jetting a main stream b15 as an annular jet, and a first jet c13 formed in an annular shape so as to surround the outer periphery of the first jet b12 and for jetting a main stream c16 as an annular jet. When the ejection velocity of the main flow a14 ejected from the first nozzle a11 is U1, the ejection velocity of the main flow b15 ejected from the first nozzle b12 is U2, and the ejection velocity of the main flow c16 ejected from the first nozzle c13 is U3, the jets are ejected from the first nozzle a11, the first nozzle b12, and the first nozzle c13 so that U2 is the largest, i.e., so that U1<U2 and U3<U2. More preferably, the jets are ejected so that U2>U1>U3.

As mentioned above, at the contact point between the fast airflow and the slow airflow, the slow airflow is attracted to the fast airflow. The greater the speed difference, the greater the amount of attraction. In the fluid conveying 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. In other words, the attraction effect is generated by creating a speed difference at the boundary between the main stream b15 and the main stream c16. In addition, an attraction effect is generated due to the speed difference at the boundary between the main stream c16 and the side stream 8, and an attraction effect is generated due to the speed difference at the boundary between the side stream 8 and the surrounding air B. Due to this attraction effect, the main stream b15 is transported while drawing in the main stream c16, the main stream c16 is transported while drawing in the side stream 8, and the side stream 8 is transported while drawing in the surrounding air B. With this type of blowing configuration, the speed difference between the secondary flow 8 and the ambient air B at the outermost periphery is smaller than the speed difference when the primary flow b15 and the ambient air B come into direct contact, so the attraction effect of the ambient air B can be suppressed. In other words, the primary flow b15 with a 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 with a slow wind speed, so the amount of attraction is suppressed. In this way, the temperature rise of the conditioned air blown out from the nozzle portion 4 during cooling, or the temperature drop during heating, can be suppressed, and the performance degradation of cooling operation in summer and heating operation in winter can be suppressed.

Furthermore, by making the wind speed U2 of the main stream b15 greater than the wind speed U1 of the main stream a14, an attraction effect also occurs at the boundary between the main stream b15 and the main stream a14. That is, the main stream b15 is transported while drawing in the main stream a14, which is the conditioned air. Furthermore, since the main stream b15 has a fast wind speed U2, it can transport the conditioned air to a long distance. The main stream a14, surrounded by the main stream b15, reaches a long distance while being attracted by the main stream b15. Furthermore, since the main stream a14 has a relatively slow wind speed U1, it is possible to suppress discomfort caused by, for example, the sensation of being directly hit by the jet or the generation of wind noise around the ears. It is also effective, for example, in the air conditioning of a factory, 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.

The present invention can be used to transport fluids for purposes such as air conditioning.

Reference Signs List 1 Fluid transport device 2 Air conditioning duct 3 First outlet 4 Nozzle section 5 Base 6 Second outlet 7 Main flow 8 Subflow 9 Crosspiece section 10 Induced air flow 11 First outlet a
12 First jet outlet b
13 First jet nozzle c
14 Mainstream a
15 Mainstream b
16 Mainstream C
Reference Signs List 21 Annular flow 101 Fluid ejection nozzle 102 Air conditioning duct 103 Opening 104 Flange-shaped member 105 Fixing member 106 Nozzle body 107 Blowing section A Conditioned air B Ambient air

Claims (4)

a cylindrical nozzle portion provided with 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 . The fluid transporting device according to claim 1 , wherein the second ejection port and the crosspiece are arranged alternately to surround the mounting portion of the nozzle portion in the circumferential direction. The fluid transport device according to claim 1 or 2, wherein the base is hemispherical. 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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