JP6139954B2 - Fluid device - Google Patents

Description

  The present invention relates to a fluid device that allows fluid to pass through a shroud.

  Conventionally, for example, Patent Document 1 proposes a blower including an axial fan having a plurality of blades and a fan shroud. The fan shroud has a peripheral wall and includes a cylindrical portion in which a part of the peripheral wall is recessed. The axial fan is disposed in the cylindrical portion.

  Moreover, the cylindrical part is provided with an opening for ensuring communication of the air flow. A motor is supported by a plurality of motor stays at the center of the opening. Furthermore, the fan shroud includes a lip portion having a bell mouth shape that spreads from the axial fan side toward the opening side at the end of the opening.

  In the air blower having such a configuration, the distance between the outer peripheral portion of the peripheral wall of the fan shroud and the outer peripheral portion of the opening is different in the circumferential direction of the opening. When the axial fan is rotated by driving the motor, the wind flows from the axial fan side toward the motor side, and flows out of the shroud through the opening.

JP 2010-222974 A

  However, since the distance from the outer periphery of the opening to the outer periphery of the peripheral wall of the shroud differs in the circumferential direction of the opening, the fluid and the shroud are located at a specific position in the circumferential direction of the opening on the downstream side of the axial fan. Interference with the surrounding wall causes fluctuations in flow velocity. For this reason, there was a problem that noise was generated.

  In the conventional blower, air (gas) is handled as a fluid. However, the above-described noise problem is not limited to the case where the fluid is a gas, and similarly occurs when the fluid is a liquid.

  An object of this invention is to provide the fluid apparatus provided with the structure which can reduce the noise in the downstream of a rotary body in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, the rotating body (40) for pumping fluid, the suction port (31) for the fluid sucked into the rotating bodies (40) (40), and the rotating body are provided. And a shroud (30) formed with a blowout port (32) for blowing out fluid from (40), and the fluid flow most downstream end (42) of the rotating body (40) ) Is located upstream of the most downstream end (36) of the fluid flow and is characterized by the following points.

  First, when viewed from the axial direction of the rotating shaft of the rotating body (40) (40), the rotating shaft from the inner peripheral wall surface (35) of the blowout port portion (32) to the outer peripheral edge portion (33) of the shroud (30). The distance in the radial direction is defined as the outer peripheral distance, and when viewed from the direction perpendicular to the rotation axis, the fluid flow from the most downstream end (42) of the rotating body (40) to the fluid flow downstream end (36) of the outlet (32). The axial height of the rotating shaft is defined as the outlet portion height.

And the outer periphery distance is changing in the circumferential direction of the rotating shaft. Further, the height of the blowout port portion is formed to change throughout the entire circumference . Furthermore, it is formed so that the position where the outer peripheral distance is shorter than the longest distance is lower than the height of the outlet portion at the longest outer peripheral distance .

  According to this, since the interference between the portion of the fluid blown out from the blowout port (32) where the velocity component increases and the blowout port (32) is suppressed, the flow velocity fluctuation of the fluid blown out from the blowout port (32) is reduced. Can be suppressed. Therefore, noise can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a side view of the air blower concerning a 1st embodiment of the present invention. It is the top view which looked at the shroud from the blower outlet side. (A) is AA sectional drawing of FIG. 2, (b) is BB sectional drawing of FIG. It is the figure which showed the measurement result of the sound pressure level of the downstream of an axial fan. It is the top view which looked at the shroud which concerns on 2nd Embodiment from the blower outlet side. It is sectional drawing of the shroud which concerns on 3rd Embodiment, (a) is a figure corresponding to the AA cross section of FIG. 2, (b) is a figure corresponding to the BB cross section of FIG. It is the top view which looked at the shroud which concerns on 4th Embodiment from the blower outlet part side. (A) is CC sectional drawing of FIG. 7, (b) is DD sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The fluid device shown in the present embodiment is configured as a blower used for cooling automobile condensers and radiators. As shown in FIG. 1, the air blower includes a condenser 10, a radiator 20, a shroud 30, an axial fan 40, and a motor 50.

  The condenser 10 is a heat exchanger that cools the refrigerant by exchanging heat between the refrigerant circulating in the refrigeration cycle (not shown) and the outside air. The radiator 20 is a heat exchanger that cools the engine coolant by exchanging heat between the engine coolant and the outside air. The condenser 10 is disposed on the front side of the radiator 20 on the vehicle side, that is, on the upstream side of the air flow. The capacitor 10 and the radiator 20 are connected and integrated.

  The shroud 30 is a component that holds the motor 50 and guides the air flow so that the air flow induced by the axial fan 40 flows to the condenser 10 and the radiator 20. The shroud 30 is disposed on the vehicle rear side of the radiator 20, that is, on the air flow downstream side.

  Further, the shroud 30 has an air inlet 31 for air sucked into the axial fan 40 and an air outlet 32 for blowing air from the axial fan 40. The suction port 31 covers the back surface of the radiator 20, that is, the surface of the radiator 20 on the vehicle rear side. The air outlet 32 has a cylindrical shape that communicates with the air inlet 31 and also communicates with the outside.

  Furthermore, as shown in FIG. 2, the planar shape of the air outlet 32 of the shroud 30 is circular. On the other hand, the planar shape of the shroud 30 is a rectangle. That is, the planar shape of the outer peripheral edge portion 33 of the shroud 30 is rectangular.

  As illustrated in FIG. 1, the axial fan 40 is a fan including a plurality of blades 41 that blow air. The axial fan 40 is configured to rotate about the rotation axis. In the present embodiment, the axial fan 40 is disposed in the hollow portion of the air outlet portion 32 of the shroud 30.

  The motor 50 is an electric motor that provides rotational power to the axial fan 40 and has a motor shaft (not shown). The motor 50 is supported by a plurality of motor stays 34 provided at the air outlet 32 of the shroud 30. The motor 50 rotates the axial fan 40 by rotating the motor shaft, and generates an air flow in the axial direction of the axial fan 40, that is, in the axial direction of the rotating shaft. The above is the overall configuration of the blower.

  Next, the specific shape of the suction inlet 31 of the shroud 30 will be described. First, the distance in the radial direction of the rotating shaft from the inner peripheral wall surface 35 of the outlet 32 to the outer peripheral edge 33 of the shroud 30 when viewed from the axial direction of the rotating shaft of the axial fan 40 is defined as the outer peripheral distance. As described above, the planar shape of the shroud 30, that is, the shape of the surface perpendicular to the rotational axis of the axial fan 40, is such that the air outlet 32 is circular and the outer peripheral edge 33 is rectangular. Accordingly, the outer peripheral distance is not constant in the circumferential direction of the rotation shaft of the axial fan 40 and changes. In other words, the outer peripheral distance differs depending on the rotation angle of the axial fan 40.

  And as mentioned above, the air which blows off from the site | part with a short outer periphery distance among the air which blows off from the blower outlet part 32 of the shroud 30 increases the speed component of the radial direction of the rotating shaft of the axial flow fan 40. Here, the axial height of the rotating shaft from the air flow most downstream end 42 of the axial fan 40 to the air flow most downstream end 36 of the outlet 32 when viewed from the direction perpendicular to the rotation axis of the axial fan 40. Is defined as the outlet height. At this time, the outlet portion height is formed so as to change in the entire circumference in the circumferential direction of the rotating shaft of the axial fan 40.

  More specifically, the outlet portion height is formed so as to decrease as the velocity component in the radial direction of the rotating shaft among the velocity components of the air blown out from the outlet portion 32 increases. In other words, the outlet portion height is formed so as to be lowered at a position where the outer peripheral distance is shortened.

  The “range where the height of the blowout port portion is lowered” is a range of a portion where the height of the blowout port portion is lower than other places. Therefore, the low height of the blowout port portion may not be constant. In this embodiment, as FIG. 1 shows, the height between the height of a normal site | part and the height of a short site | part among the height of the blower outlet part 32 of the blower outlet part 32 is changing in steps.

  In the present embodiment, the range in which the outlet portion height of the outlet portion 32 is lowered in the circumferential direction of the rotating shaft of the axial fan 40 is the outer peripheral distance of the shroud 30 as shown in FIG. Is symmetrical about the position of the air outlet 32 corresponding to the shortest part. That is, the range in which the outlet part height of the outlet part 32 is lowered is from the position of the outlet part 32 corresponding to the portion of the shroud 30 where the outer peripheral distance is the shortest to the upstream side of the rotation of the axial fan 40. The length and the length to the downstream side of the rotation are the same.

  As shown in FIG. 3A, the inner peripheral wall surface 35 of the air outlet portion of the blower outlet portion 32 at the air outlet portion of the blower outlet portion 32 corresponding to the portion of the shroud 30 where the outer peripheral distance becomes long. Has a bell mouth shape protruding toward the rotating shaft of the axial fan 40. Thereby, since air flows along a bellmouth shape, the air can be rectified.

  On the other hand, the bell mouth shape is not provided in the portion of the air outlet portion 32 of the shroud 30 where the outer peripheral distance is short, as shown in FIG. In addition, it can be said that the above-described means of “reducing the height of the air outlet portion” has removed the bell mouth-shaped portion of the air outlet portion 32. As described above, since the height of the portion of the air outlet portion 32 of the shroud 30 where the sound is generated is low, interference between the air and the air outlet portion 32 is suppressed. That is, fluctuations in the air flow velocity on the downstream side of the axial fan 40 are suppressed, air flow disturbance is reduced, and the air flow is improved. In FIG. 3B, the motor stay 34 is omitted.

  The inventors of the present invention reduced the height of the air outlet portion of the conventional product in which the air outlet portion height of the air outlet portion 32 is constant and the height of the air outlet portion of the portion of the air outlet portion 32 where the outer peripheral distance is shortened. The sound pressure level downstream of the flow fan 40 was measured. According to the measurement result shown in FIG. 4, the sound pressure level on the downstream side of the axial fan 40 is reduced by 1.8 dB by reducing a part of the height of the outlet as described above. That is, noise could be reduced as compared with the conventional product.

  As described above, the height of the air outlet portion of the air outlet portion 32 of the shroud 30 where the velocity component increases, that is, the portion where the outer peripheral distance is shortened is reduced. , Interference between the part and air can be suppressed. Thereby, the flow velocity fluctuation | variation of the air which blows off from the blower outlet part 32 is suppressed, and a noise can be reduced by extension.

  As for the correspondence between the description of the present embodiment and the description of the claims, the axial fan 40 corresponds to the “rotary body” of the claims. Further, the most downstream end 36 of the air flow of the outlet 32 corresponds to “the most downstream end of the fluid flow of the outlet” and the most downstream end 42 of the axial flow fan 40 is claimed. To “the most downstream end of the fluid flow of the rotating body”.

(Second Embodiment)
In the present embodiment, parts different from the first embodiment will be described. The present embodiment is characterized in that a range in which the height of the blowout port portion of the blowout port portion 32 is low is provided according to the rotational direction of the axial fan 40.

  First, as illustrated in FIG. 5, a virtual line 60 is defined as a line connecting the position where the outer peripheral distance is the shortest in the outer peripheral edge portion 33 of the shroud 30 and the rotation axis in the radial direction of the rotation axis. And the site | part in which the blower outlet part height was formed low among the blower outlet parts 32 in the circumferential direction of the rotating shaft of the axial fan 40, and the length from the virtual line 60 to the rotation upstream of the axial fan 40, The length from the imaginary line 60 to the rotational downstream side of the axial fan 40 is different. That is, the range in which the height of the blowout port portion of the blowout port portion 32 is low is asymmetrical about the virtual line 60 in the circumferential direction of the rotation axis of the axial fan 40.

  Here, the air blown out from the air outlet 32 is easy to flow in the rotational direction of the axial fan 40. Accordingly, the portion of the air outlet portion 32 having a low air outlet portion height has a length from the virtual line 60 to the rotation downstream side of the axial fan 40 in the circumferential direction of the rotating shaft of the axial fan 40. It is preferable that the length is longer than the length toward the upstream side of the rotation. Thereby, interference with the air which flows easily in the rotation direction of the axial fan 40, and the wall surface of the blower outlet part 32 can be reduced more effectively.

  In addition, the specific length formed with the low outlet portion height is within a range from −15 ° to + 30 ° in the circumferential direction of the rotating shaft of the axial fan 40 when the imaginary line 60 is 0 °. is there. In the present embodiment, as shown in FIG. 5, when the shroud 30 is viewed from the air outlet 32, the rotational direction of the axial fan 40 is clockwise. Therefore, the height of the blowout port portion of the blowout port portion 32 is a portion where the range from −15 ° to + 30 ° is low with the virtual line 60 as the center.

  As described above, in the present embodiment, the range of the outlet portion height of the outlet portion 32 is defined according to the rotational direction of the axial fan 40. Thereby, it is possible to prevent the cooling performance of the condenser 10 and the radiator 20 from being reduced by reducing the amount of air blown from the shroud 30 due to the interference between the air flowing in the rotational direction of the axial fan 40 and the air outlet 32. it can.

(Third embodiment)
In the present embodiment, parts different from the first and second embodiments will be described. In this embodiment, as shown in FIG. 6A and FIG. 6B, in the blowout port portion 32, the range in which the blowout port portion height of the blowout port portion 32 is lowered and the range in which it is not so are related. Instead, a bell mouth shape is formed in the entire circumferential direction of the rotation shaft of the axial fan 40.

  Further, as shown in FIG. 6B, the bell mouth shape of the outlet portion 32 in the portion of the outlet portion 32 of the shroud 30 where the outer peripheral distance is short, that is, the portion where the outlet portion height is low, is as follows. The shroud 30 is formed to be smaller than the bell mouth shape of the air outlet portion 32 in a portion where the outer peripheral distance is long, that is, a portion where the height of the air outlet portion is not low.

  Specifically, in the bell mouth shape, the height in the axial direction of the rotation axis of the axial fan 40 is set to the bell mouth height, and the inner peripheral wall surface 35 of the blowout port 32 extends to the rotation axis side of the axial fan 40. The protruding width is defined as the bellmouth width. The bell mouth shape of the portion of the air outlet portion 32 where the height of the air outlet portion is lowered is smaller than the bell mouth shape of the portion of the air outlet portion 32 where the height of the air outlet portion is not lowered. The mouse height and the bell mouth width are formed small. Further, the bell mouth height in the bell mouth shape of the portion of the air outlet portion 32 where the height of the air outlet portion is low is formed smaller than the bell mouth width of the bell mouth shape.

  Thus, while providing the bell mouth shape also in the site | part where the blower outlet part height is low among the blower outlet parts 32, the blower outlet part height can be made low by making the size small. Moreover, air can be rectified by the bell mouth shape also in the part where the outlet part height is low in the outlet part 32.

(Fourth embodiment)
In the present embodiment, parts different from the first to third embodiments will be described. In the present embodiment, the shroud 30 shown in FIG. 7 is not provided with a bell mouth shape at the air outlet portion of the air outlet 32 as shown in each cross section of FIG. As described above, the shroud 30 may have a structure in which the bell mouth shape is not provided in the air outlet portion 32.

(Other embodiments)
The structure of the air blower shown by said each embodiment is an example, It can also be set as the other structure which can implement | achieve this invention, without being limited to the structure shown above. For example, the air blower may have a configuration including at least the shroud 30 and the axial fan 40.

  Moreover, the site | part in which the blower outlet part height was normal, and the site | part in which the blower outlet part height was formed low among the blower outlet parts 32 may be continuous. In other words, the height of the air outlet portion 32 of the air outlet portion 32 only needs to be formed so as to be lowered at a position where the outer peripheral distance is shortened. Therefore, the height of the air outlet portion continuously changes in a tapered shape or a slope shape. You may do it. As described above, the height of the air outlet portion of the air outlet portion 32 may be formed either continuously or intermittently (discontinuously).

  In 2nd Embodiment, although the angle range in which the blower outlet part height was formed low is shown, this is an example. Therefore, the angle range may be appropriately set according to the situation in which the shroud 30 is used.

  The bell mouth shape of the air outlet 32 shown in the above embodiments is an example. Of course, the bell mouth height and the bell mouth width may be appropriately set according to the shape of the shroud 30.

  In each said embodiment, although the fluid apparatus was comprised as an air blower which allows air (gas) to pass through as a fluid, this is an example of a structure of a fluid apparatus. Therefore, the fluid device may be configured such that liquid passes through the shroud 30 as a fluid. Further, the axial fan 40 for allowing the fluid to pass through the shroud 30 is not limited to the axial fan 40, and a rotating body capable of pumping fluid according to the configuration of the fluid device can be used.

DESCRIPTION OF SYMBOLS 30 Shroud 31 Inlet part 32 Outlet part 33 Outer peripheral edge part 35 Inner peripheral wall surface 36 Airflow most downstream end of an outlet part 40 Axial fan 42 Airflow most downstream end of an axial fan 60 Virtual line

Claims (7)

A rotating body (40) for pumping fluid;
A shroud (30) formed with a suction port portion (31) for fluid sucked into the rotating body (40) and a blowout port portion (32) for blowing fluid from the rotating body (40). ,
The fluid flow most downstream end (42) of the rotating body (40) is located on the fluid flow upstream side of the fluid flow downstream end (36) of the outlet (32),
The diameter of the rotating shaft from the inner peripheral wall surface (35) of the air outlet (32) to the outer peripheral edge (33) of the shroud (30) when viewed from the axial direction of the rotating shaft of the rotating body (40). Let the distance in the direction be the outer distance,
The axial direction of the rotating shaft from the fluid flow most downstream end (42) of the rotating body (40) to the fluid flow most downstream end (36) of the outlet (32) when viewed from the vertical direction of the rotating shaft. Is defined as the outlet height.
The outer peripheral distance changes in the circumferential direction of the rotating shaft,
The outlet portion height is formed to change throughout the circumference,
The fluid device is characterized in that, at a position where the outer peripheral distance is shorter than the longest distance, the fluid outlet is formed so as to be lower than the height of the outlet at the longest outer peripheral distance.   The fluid device according to claim 1, wherein the fluid is air, and the rotating body is an axial fan (40). When a line connecting the position where the outer peripheral distance is the shortest in the outer peripheral edge portion (33) of the shroud (30) and the rotating shaft in the radial direction of the rotating shaft is defined as a virtual line (60),
Of the outlet part (32), the part where the outlet part height is formed lower than the part where the outer peripheral distance is the longest is the imaginary line (60) in the circumferential direction of the rotating shaft. The length from the rotation upstream side of the axial fan (40) to the length from the virtual line (60) to the rotation downstream side of the axial fan (40) is different. Or the fluid apparatus of 2.   Of the outlet part (32), the part where the outlet part height is formed lower than the part where the outer peripheral distance is the longest is the imaginary line (60) in the circumferential direction of the rotating shaft. The length of the axial fan (40) to the downstream side of rotation is longer than the length from the virtual line (60) to the upstream side of rotation of the axial fan (40). Fluid device.   Of the outlet part (32), the part where the height of the outlet part is formed lower than the part where the outer peripheral distance is the longest, the virtual line (60) is set to 0 in the circumferential direction of the rotating shaft. 5. The fluid device according to claim 4, wherein the fluid device is located in a range of −15 ° to + 30 °. The air outlet portion (32) has a bell mouth shape in which the inner peripheral wall surface (35) of the air outlet portion of the air outlet portion (32) protrudes toward the rotating shaft side of the axial flow fan (40). And
In the bell mouth shape, the axial direction height of the rotation axis of the axial fan (40) is set to the bell mouth height, and the axial fan (40) from the inner peripheral wall surface (35) of the outlet (32). 40) If the width protruding to the rotation axis side is defined as the bellmouth width,
The bell mouth shape of the portion of the outlet portion (32) where the height of the outlet portion is lower than that of the portion having the longest outer peripheral distance is the outlet portion of the outlet portion (32). 6. The fluid according to claim 1, wherein the height of the bell mouth and the width of the bell mouth are formed smaller than the bell mouth shape of the portion where the height is not lowered. apparatus.   The bell mouth height in the bell mouth shape of the portion where the height of the air outlet portion is formed lower than the portion of the air outlet portion (32) having the longest outer peripheral distance is the bell mouth shape of the bell mouth shape. The fluid device according to claim 6, wherein the fluid device is smaller than the width.

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