Discharge unit

Abstract

To provide a discharge unit that can lengthen a range of an airflow even if opening areas of through holes are small while securing silence.SOLUTION: A discharge unit 1 comprises: an axial fan 2; a discharge panel 4 comprising a plurality of through holes 41 each extending along a rotation axis RAx of the axial fan 2, and for blowing air discharged from the axial fan 2 via the plurality of through holes 41; and a chamber 3 provided between the discharge panel 4 and the axial fan 2, extending along the rotation axis RAx, and for passing the air discharged from the axial fan 2. The chamber 3 has an annular shape around the rotation axis RAx, and passes the air discharged from the axial fan 2 in a direction along the rotation axis RAx.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air outlet unit that conditions the air inside a room or a vehicle. [Background technology]

[0002] Conventionally, a configuration in which a heat exchanger and a fan are integrated has been proposed as a blowing unit for conditioning the air inside a room or a vehicle (see, for example, Patent Document 1). In the blowing unit (indoor unit) described in Patent Document 1, a centrifugal fan is used as the fan. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6978664 Summary of the Invention [Problem to be solved by the invention]

[0004] In air conditioning a room or a vehicle, the shape and arrangement of multiple through holes formed in the air outlet panel of the air outlet unit contribute to the formation of airflow distribution in the space, and are important from the viewpoint of thermal comfort. In addition, the air outlet unit must ensure quietness, safety, and airflow distribution according to the purpose, depending on the air volume, equipment configuration, and target space.

[0005] Here, when the blow-out panel and the fan are integrated into a blow-out unit, there is no need for a flow path such as a duct, so it is expected that the energy loss due to flow path resistance will be reduced and installation will be easier. However, it is necessary to solve the problem of fan vibration and noise that occurs when the fan is placed close to places where people stay.

[0006] Furthermore, for example, when installing the blow-out unit on the floor surface, it is necessary to reduce the opening area of ​​the through-hole in the blow-out panel, taking into consideration shoes with small contact areas with the floor, such as stiletto heels. When the opening area of ​​the through-hole is reduced in this way, it becomes difficult to increase the reach of the airflow.

[0007] The blowing unit described in Patent Document 1 uses a centrifugal fan, which has the problem that it consumes a lot of power and is prone to generating noise when installed near a room, making it difficult to use in spaces where a large number of people are present.

[0008] Therefore, there is a demand for a technique that can increase the reach of the airflow even when the opening area of ​​the through-hole is small while ensuring quietness.

[0009] The present invention has been made in consideration of the above, and aims to provide an air outlet unit that can increase the reach of the airflow even when the opening area of ​​the through hole is small, while ensuring quietness. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems and achieve the object, the blowing unit of the present invention comprises an axial fan that draws in and expels air by rotating rotors about a rotation axis, a blowing panel having a plurality of through holes each extending along the rotation axis and blowing out the air discharged from the axial fan through the plurality of through holes, and a chamber provided between the blowing panel and the axial fan, extending along the rotation axis and circulating the air discharged from the axial fan, wherein the chamber has a ring shape centered on the rotation axis and circulates the air discharged from the axial fan in a direction along the rotation axis.

[0011] In addition, in the blowing unit of the present invention, in the above-mentioned invention, the airflow velocity of the air discharged from the axial fan is greater on the outer edge side of the rotating blades than on the side close to the rotating shaft, when viewed from the direction along the rotating shaft, and the density of the through holes is greater on the outer edge side of the rotating blades than on the side close to the rotating shaft, when viewed from the direction along the rotating shaft.

[0012] In the blowing unit according to the present invention, in the above-mentioned invention, the through hole has a bell-mouth shape that increases in diameter toward the air inlet end. Effect of the Invention

[0013] The blowing unit according to the present invention includes an axial fan that draws in and expels air by rotating blades about a rotation axis, a blowing panel having a plurality of through holes each extending along the rotation axis and blowing out the air discharged from the axial fan through the plurality of through holes, and a chamber provided between the blowing panel and the axial fan, extending along the rotation axis and circulating the air discharged from the axial fan. Here, the chamber has a ring shape centered on the rotation axis and has an annular flow path that circulates the air discharged from the axial fan in a direction along the rotation axis. That is, by providing a chamber between the blow-out panel and the axial fan, it is possible to solve the problem of vibrations and noise of the axial fan being transmitted to places where people are staying. Also, since an axial fan has a characteristic that the airflow speed of the discharged air is faster on the outer edge side of the rotor blades than on the side close to the rotor shaft when viewed from the direction along the rotor shaft, by making the flow path of the chamber an annular flow path that matches this characteristic, it is possible to increase the reach of the airflow even if the opening area of ​​the through hole is small. Therefore, the blowing unit according to the present invention has the advantage that it is possible to increase the reach of the airflow while ensuring quietness, even when the opening area of ​​the through-hole is small.

[0014] In the blowing unit according to the present invention, the airflow speed of the air discharged from the axial fan is faster on the outer edge side of the rotor blades than on the side close to the rotor shaft when viewed along the rotor shaft, and the density of the through holes is greater on the outer edge side of the rotor blades than on the side close to the rotor shaft when viewed along the rotor shaft. In other words, since the through holes are preferentially arranged in places where the dynamic pressure of the axial fan is high, the reach of the airflow can be further increased.

[0015] Also, in the blow-out unit according to the present invention, the through-hole has a bell-mouth shape that increases in diameter toward the air inlet end. This reduces the pressure loss of the airflow to the through-hole, and further increases the reach of the airflow. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing a blowing unit according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing a square chamber used for evaluating the reach of air currents. [Diagram 3] FIG. 3 is a diagram showing a circular chamber used for evaluating the reach of air currents. [Figure 4] FIG. 4 is a diagram showing the first to eleventh samples (A) to (K) used in the evaluation of the reach of the air current. [Diagram 5] FIG. 5 is a diagram showing the evaluation results of the reach distance of air currents. [Figure 6] FIG. 6 is a diagram showing the evaluation results of the reach distance of air currents. [Figure 7] FIG. 7 is a diagram showing the results of evaluation of the presence or absence of bell-mouth processing in through-holes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, a mode for carrying out the present invention (hereinafter, referred to as an embodiment) will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below. Furthermore, in the description of the drawings, the same parts are given the same reference numerals.

[0018] [Configuration of the blowing unit] Fig. 1 is a diagram showing a blowing unit 1 according to an embodiment. Specifically, Fig. 1(a) is a diagram showing the blowing unit 1 as viewed from the side (a direction perpendicular to the rotation axis RAx). Fig. 1(b) is a diagram showing the chamber 3 as viewed from a direction along the rotation axis RAx. The blowing unit 1 is installed, for example, on the floor of a room and performs air conditioning of the room. The installation location of the blowing unit 1 is not limited to the floor of the room, and it may be installed in other positions such as the ceiling or inside the vehicle. As shown in FIG. 1, the blowing unit 1 includes an axial fan 2, a chamber 3, and a blowing panel 4.

[0019] 1(a), the axial flow fan 2 includes a motor unit 21 disposed at the center, and rotary blades 22 that rotate about a rotation axis RAx by the motor unit 21. The axial flow fan 2 draws in and expels air along the rotation axis RAx by the rotation of the rotary blades 22. Axial flow fan 2 is characterized in that the airflow speed is high near the outer edge of rotor blades 22 and low in the center where motor unit 21 is located. In Fig. 1(a), the airflow speed is represented by a dashed arrow, and the longer the arrow, the higher the airflow speed.

[0020] As shown in FIG. 1(a), the chamber 3 is provided between the axial fan 2 and the blow-out panel 4, and connects the axial fan 2 and the blow-out panel 4. In this embodiment, the chamber 3 is configured as a torus-shaped chamber. Specifically, the chamber 3 has a tubular portion 31 that extends along the rotation axis RAx and allows the air discharged from the axial fan 2 to flow. The tubular portion 31 is formed in a cylindrical shape with the outer position of the rotary blades 22 extending along the rotation axis RAx and the rotation axis RAx as the central axis. In addition, the tubular portion 31 is provided with an inner cylindrical portion 32 that is formed in a cylindrical shape with the outer position of the motor portion 21 extending along the rotation axis RAx and is coaxial with the tubular portion 31. That is, the chamber 3 is provided with an annular flow path FP (FIG. 1) that is a space between the inner surface of the tubular portion 31 and the outer surface of the inner cylindrical portion 32 and allows the air discharged from the axial fan 2 to flow in a direction along the rotation axis RAx.

[0021] The blow-out panel 4 is a plate that closes the tubular portion 31 in the chamber 3, and has a plurality of through holes 41 that penetrate the front and back of the plate and extend along the rotation axis RAx. In this embodiment, the plurality of through holes 41 all have the same shape, and are configured as circular holes with a diameter of, for example, 6 mm, taking into consideration shoes with a small contact area with the floor, such as stiletto heels. The diameter of the through holes 41 is not limited to 6 mm, and may be other dimensions. The blow-out panel 4 blows out the air discharged from the axial fan 2 through the chamber 3 via the plurality of through holes 41.

[0022] Here, in the blow-out panel 4, a circular region facing the center where the motor unit 21 of the axial fan 2 is disposed is defined as a first region Ar1 (FIG. 1(a)). That is, the first region Ar1 is a region on the side close to the rotation axis RAx when viewed from the direction along the rotation axis RAx, and is a region where the airflow speed of the air discharged from the axial fan 2 is slow. In addition, the first region Ar1 is a region facing a location close to the inner surface of the inner cylindrical portion 32 when viewed from the direction along the rotation axis RAx.

[0023] In addition, in the blow-out panel 4, a circular ring-shaped region facing a location close to the outer edge of the rotary blades 22 of the axial flow fan 2 is defined as a second region Ar2 (FIG. 1(a)). That is, the second region Ar2 is a region closer to the inner surface of the tubular portion 31 than the first region Ar1 when viewed from the direction along the rotation axis RAx, and is a region where the airflow speed of the air discharged from the axial flow fan 2 is high. The density of the through holes 41 is greater in the second region Ar2 than in the first region Ar1 in the blow-out panel 4. That is, the density of the through holes 41 is greater on the outer edge side of the rotary blades 22 than on the side close to the rotation axis RAx, as viewed from the direction along the rotation axis RAx. An example of an arrangement pattern of the multiple through holes 41 is the arrangement pattern (j) in FIG.

[0024] In addition, in this embodiment, the through hole 41 is processed (hereinafter referred to as bell-mouth processing) so as to increase in diameter toward the air inlet end (the lower end of (a) in Figure 1) in order to reduce the pressure loss of the airflow into the through hole 41, and has a bell-mouth shape.

[0025] [Evaluation of airflow reach] The airflow reach was evaluated for the following first to eleventh samples (A) to (K). Fig. 2 corresponds to Fig. 1 and shows a square chamber 3A used in the evaluation of the air current reach distance. Fig. 3 corresponds to Fig. 1 and shows a circular chamber 3B used in the evaluation of the air current reach distance. Fig. 4 shows first to eleventh samples (A) to (K) used in the evaluation of the air current reach distance.

[0026] The first sample (A) is a sample in which a square chamber 3A (FIG. 2) is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (a) (FIG. 4). The second sample (B) is a sample in which a square chamber 3A is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (b) (FIG. 4). The third sample (C) is a sample in which a square chamber 3A is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (c) (FIG. 4). The fourth sample (D) is a sample in which a circular chamber 3B (FIG. 3) is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (d) (FIG. 4). The fifth sample (E) is a sample in which a circular chamber 3B is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (e) (FIG. 4). The sixth sample (F) is a sample in which a circular chamber 3B is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (f) (FIG. 4). The seventh sample (G) is a sample in which a torus-shaped chamber 3 is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (g) (FIG. 4). The eighth sample (H) is a sample in which a torus-shaped chamber 3 is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (h) (FIG. 4). The ninth sample (I) is a sample in which a torus-shaped chamber 3 is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (i) (FIG. 4). The tenth sample (J) is a sample in which a torus-shaped chamber 3 is used as the blowing unit 1, and the arrangement pattern of the plurality of through holes 41 is the arrangement pattern (j) (FIG. 4). The eleventh sample (K) is a sample in which a torus-shaped chamber 3 is used as the blowing unit 1, and the arrangement pattern of the plurality of through-holes 41 is the arrangement pattern (k) (FIG. 4).

[0027] Here, the rectangular chamber 3A has a different shape of the tubular portion 31 from the torus-shaped chamber 3. As shown in Fig. 2, the tubular portion 31 of the rectangular chamber 3A is formed into a substantially square tubular shape in which the outer shape position of the blow-out panel 4 extends toward the axial fan 2 along the rotation axis RAx and one end on the axial fan 2 side is reduced in diameter to match the outer shape of the axial fan 2. Moreover, the circular chamber 3B is a chamber in which the inner cylindrical portion 32 is omitted, compared to the torus-shaped chamber 3.

[0028] The number of through holes 41 is the same for all of the first to eleventh samples (A) to (K), 50, and the opening area is the same. Furthermore, in all of the first to eleventh samples (A) to (K), bell-mouth processing is not performed on the through holes 41. That is, in all of the first to eleventh samples (A) to (K), the through holes 41 are all configured with the same diameter from the air inlet end to the air outlet end.

[0029] Then, the first to eleventh samples (A) to (K) were sequentially placed on the floor surface, and airflow measurements were performed using a jig for measuring airflow and a hot wire anemometer in a horizontal range of ±600 mm at heights of 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, and 2000 mm from the floor surface. Note that the rotation speed of the axial flow fan 2 was the same for all of the first to eleventh samples (A) to (K) when measuring the airflow.

[0030] Fig. 5 and Fig. 6 are diagrams showing the evaluation results of the reach of the airflow. Specifically, Fig. 5 is a graph with the horizontal axis representing the average airflow velocity [m / s] and the vertical axis representing the height [m] from the floor surface. Fig. 6 is a diagram showing the wind speed distribution of the blown airflow. Specifically, Fig. 6 is a graph with the horizontal axis representing the horizontal length [mm] from the first to eleventh samples (A) to (K) and the vertical axis representing the height [m] from the floor surface, with the average airflow velocity [m / s] at the corresponding horizontal length and height position from the floor surface divided by dots or diagonal lines. As a result of the evaluation, it was found that the first to third samples (A) to (C) using the square chamber 3A had a shorter reach of the airflow than the fourth to eleventh samples (D) to (K) using the circular chamber 3B and the torus-shaped chamber 3. In addition, when the fourth to sixth samples (D) to (F) using the circular chamber 3B were compared with the seventh to eleventh samples (G) to (K) using the torus-shaped chamber 3, there was no advantage due to the chamber shape, and the airflow distribution differed depending on the arrangement pattern of the multiple through holes 41. Furthermore, the fourth, sixth and tenth samples (D), (F) and (J), in which the through holes 41 were mainly arranged near the inner surface of the tube portion 31 (second region Ar2), had a wind speed (average airflow speed) of 0.3 m / s or more even in a space 1.4 m or higher above the floor surface. From the above, it was found that the shape of the air outlet panel 4, in which the through holes 41 are close to the inner surface of the tubular portion 31 and are concentrated in places where the dynamic pressure of the axial fan 2 is high, is effective in increasing the reach of the airflow.

[0031] [Evaluation of the presence or absence of bell mouth processing in through holes] For the tenth sample (J), which had the longest airflow reach, the average airflow velocity was further evaluated depending on whether or not the through-hole 41 was provided with a bellmouth. Fig. 7 is a diagram showing the evaluation results for the presence or absence of bell-mouth processing on through-hole 41. Specifically, Fig. 7 is a graph with the average air velocity [m / s] on the horizontal axis and the height [m] from the floor surface on the vertical axis. In Fig. 7, the evaluation results of samples where through-hole 41 was not bell-mouthed are shown by black circles, and the evaluation results of samples where through-hole 41 was bell-mouthed are shown by white circles. The evaluation results, as shown in Figure 7, showed that the average air velocity [m / s] at each height above the floor was greater with the bellmouth processing.

[0032] In consideration of the above evaluation results, the blow-out unit 1 is preferably the tenth sample (J) in which the through-hole 41 is bell-mouthed.

[0033] According to the present embodiment described above, the following effects are achieved. The blow-out unit 1 according to the present embodiment is the tenth sample (J), in which the through-hole 41 is subjected to bell-mouth processing. Therefore, even if the opening area of ​​the through-hole 41 is small (if the through-hole 41 is a circular hole with a diameter of 6 mm), the reach of the airflow can be increased. Also, by providing the chamber 3 between the blow-out panel 4 and the axial flow fan 2, the problem of vibration and sound of the axial flow fan 2 being transmitted to places where people are staying can be solved. Therefore, the blowing unit 1 has an advantage that it is possible to increase the reach of the air current even when the opening area of ​​the through-hole 41 is small, while ensuring quietness. [Explanation of symbols]

[0034] 1. Blowing unit 2 Axial Fan 3, 3A, 3B Chambers 4. Air outlet panel 21 Motor section 22 Rotating blade 31 Cylinder part 32 Inner cylindrical part 41 Through hole Ar1 First area Ar2 Second Area FP Annular flow path RAx Rotation Axis

Claims

1. an axial flow fan that draws in and discharges air by rotating a rotor blade around a rotation axis; a blow-out panel having a plurality of through holes each extending along the rotation shaft, the blow-out panel blowing out air discharged from the axial flow fan through the plurality of through holes; a chamber provided between the blow-out panel and the axial flow fan, extending along the rotation shaft and allowing air discharged from the axial flow fan to flow; The chamber comprises: The fan has an annular shape centered on the rotation shaft, and circulates the air discharged from the axial flow fan in a direction along the rotation shaft. A blowing unit characterized by the above.

2. The airflow speed of the air discharged from the axial flow fan is When viewed from the direction along the rotary shaft, the outer edge side of the rotary blade is larger than the side close to the rotary shaft, The density of the through holes is When viewed from the direction along the rotary shaft, the outer edge side of the rotary blade is larger than the side close to the rotary shaft. The blowing unit according to claim 1 .

3. The through hole is It has a bell-mouth shape that expands toward the air inlet end. The blowing unit according to claim 1 .

Images