JP6422591B2 - Air conditioner outdoor unit - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner having a heat exchanger and a blower.

  BACKGROUND ART Conventionally, an outdoor unit for an air conditioner has a structure in which a heat exchanger and a blower that blows air to the heat exchanger are accommodated in a housing. Among these, a so-called top flow type outdoor unit is known in which the heat exchanger is disposed on the side surface of the housing and the blower is disposed on the upper side of the housing (see, for example, Patent Documents 1 and 2). In Patent Document 1, heat exchangers are arranged on four surfaces of a casing having a rectangular cross section, a blower is arranged on the top of the casing, and a bell mouth is placed on the top of the casing so as to surround the blower. An outdoor unit for an air conditioner provided is disclosed. Patent Document 2 discloses that a bell mouth is provided so as to surround the blower at the top of a casing having a rectangular cross section, and the bell mouth has a predetermined diameter and a predetermined angle.

JP 2003-254565 A International Publication No. 2012/035557

  However, when the cross section of the housing is formed in a rectangular shape as in Patent Documents 1 and 2, the distance between the heat exchanger and the bell mouth is different between the short side and the long side. For this reason, when the airflow sucked from the heat exchanger reaches the bell mouth via the blower, an air vortex may be generated, and noise due to the vortex may be generated.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an outdoor unit of an air-conditioning apparatus that can reduce noise.

An outdoor unit of an air conditioner according to the present invention has a rectangular parallelepiped housing having a first side surface and a second side surface adjacent to the first side surface, each having an opening on the first side surface and the second side surface, The heat exchanger disposed in the housing and the upper portion of the housing are disposed at a position where the distance from the second side surface is larger than the distance from the first side surface, and rotates around the rotation axis. A blower that blows air upward, and a bell mouth that is provided so as to surround the blower at the upper part of the housing and has a flare portion that is formed so as to spread upward, the flare portion being the first of the housing provided on the side surface side, a first flared portion inclined at a first spread angle Shi pairs on the rotary shaft, provided on the second side face side of the housing, at a first spread angle larger than the second spread angle to the rotational axis have a second flared portion inclined, first spread angle αl and second spread The angle αs is a second outflow side angle βs formed by an imaginary line connecting the upper inner end of the heat exchanger on the second side surface and the lower outer periphery of the blower and the rotation axis, and the inner upper end of the heat exchanger on the first side surface. When the first outflow side angle βl formed by the imaginary line connecting the outer peripheral lower end of the blower and the rotation axis, Δβ = βs−βl, βs> βl and βs + Δβ>αs>αl> βl−Δβ are satisfied. Is formed .

  According to the outdoor unit of the air conditioner according to the present invention, the second spread angle with respect to the rotation axis of the second flare portion is larger than the first spread angle with respect to the rotation axis of the first flare portion, so that the casing has a rectangular cross section. Even if the side surface of the housing and the distance between the heat exchanger and the blower are different, the generation of air vortices can be preconfigured to reduce noise.

It is a perspective view of the outdoor unit of the air conditioning apparatus of Embodiment 1 of the present invention. It is a schematic diagram which shows planarly the internal structure of the outdoor unit of the air conditioning apparatus of Embodiment 1 of this invention. It is II sectional drawing in the outdoor unit of the air conditioning apparatus of FIG. It is II-II sectional drawing in the outdoor unit of the air conditioning apparatus of FIG. It is II sectional drawing of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is II-II sectional drawing of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 2 of this invention. It is II sectional drawing of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 3 of this invention. It is II-II sectional drawing of the outdoor unit of the air conditioning apparatus which concerns on Embodiment 3 of this invention. It is II sectional drawing in the outdoor unit of the air conditioning apparatus of Embodiment 4 of this invention. It is the III-III cross section in FIG. 9, Comprising: It is a plane expanded view of the cylindrical cross section centering on the rotating shaft of the propeller of an air blower. It is sectional drawing of the bell mouth part of the outdoor unit of the air conditioning apparatus of this invention. It is a top view which shows planarly the internal structure of the outdoor unit of the air conditioning apparatus comprised with two propeller fans of this invention.

Embodiment 1 FIG.
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an outdoor unit of an air conditioner according to the present invention will be described with reference to the drawings. 1 is a perspective view of an outdoor unit of an air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating in plan the internal configuration of the outdoor unit of the air-conditioning apparatus according to Embodiment 1 of the present invention. The outdoor unit 1 of the air conditioner of FIGS. 1 and 2 is a so-called top flow type outdoor unit, and is connected to an indoor unit through, for example, a refrigerant pipe to constitute a heat pump type refrigerant circuit. The outdoor unit 1 of the air conditioner includes a housing 2, a heat exchanger 3 accommodated in the housing 2, and a blower 4 that blows air to the heat exchanger 3. In addition, a compressor or the like (not shown) is accommodated in the lower portion of the housing 2.

  The housing | casing 2 is formed in the substantially rectangular parallelepiped shape, for example, the horizontal cross section (XY cross section) is formed in the rectangular shape. The casing 2 has a first side surface 21 on the long side having a length Ll in the width direction (arrow X direction) and a length Ls (<Ll) in the depth direction (arrow Y direction). It has a second side surface 2s on the short side adjacent to 2l. The housing 2 has an opening 2a serving as an air suction port on each of the first side surface 21 and the second side surface 2s. In FIG. 1 and FIG. 2, openings 2a are formed in the first side surface 21 and the second side surface 2s, respectively.

  The heat exchanger 3 is composed of, for example, a fin tube type heat exchanger formed in an L shape, and is disposed in the housing 2. That is, one heat exchanger 3 formed in an L shape is disposed over the opening 2a of the first side surface 21 and the second side surface 2s, and two L-shaped heat exchanges are provided in the housing 2. A vessel is installed. The heat exchanger 3 is installed such that the height position of the heat exchanger 3 is the same on the first side surface 21 side and the second side surface 2s side. The heat exchanger 3 exchanges heat between the air sucked into the housing 2 from the opening 2 a and the refrigerant by the operation of the blower 4. In addition, although illustrated about the case where the heat exchanger 3 is formed in L shape, it is not limited to this shape, Various well-known shapes can be employ | adopted. For example, the heat exchanger 3 is formed in a flat plate shape and may be arranged in the opening 2a on each side surface.

  The blower 4 is made of a propeller fan, for example, and is disposed on the upper portion of the housing 2. The blower 4 includes a boss 4a that rotates about a rotation axis FC, and a plurality of propellers 4b that are attached to the outer periphery of the boss 4a. The blower 4 rotates about a rotation axis FC extending in the height direction (arrow Z direction) of the housing 2, sucks air into the housing 2 from the opening 2 a on the side surface of the housing 2, and performs heat exchange. The air heat-exchanged by the vessel 3 is blown upward.

  The blower 4 is disposed at a position where the distance ΔDs with the second side surface 2s is larger than the distance ΔD1 with the first side surface 21. In FIG. 2, the rotation axis FC of the blower 4 is set at a position that is substantially the center of the XY section of the housing 2. Since the housing 2 is formed in a rectangular cross section, the distance ΔDs between the heat exchanger 3 on the second side 2s side and the blower 4 is the distance between the heat exchanger 3 on the first side 2l side and the blower 4 It becomes longer than ΔDl.

  An annular bell mouth 10 formed, for example, in an elliptical shape on the XY plane is provided on the top of the housing 2, and the blower 4 is installed in a state surrounded by the bell mouth 10. The bell mouth 10 may be provided integrally with the housing 2 or may be formed as a separate body and fixed to the housing 2. The bell mouth 10 has a flare portion 13 that gradually spreads upward, and is formed so that the opening diameter increases toward the downstream side of the air flow. Specifically, the bell mouth 10 has a curved air inflow portion 11 formed so as to narrow as it goes upward from the housing 2 side, and a straight portion formed on the air inflow portion 11 and extending upward. 12 and a flare portion 13 formed on the straight portion 12 and gradually spreading upward.

  The air inflow portion 11 has a flare shape in which the opening diameter gradually decreases upward. The straight portion 12 is formed, for example, in parallel with the rotation axis FC, and the blower 4 is installed in a state surrounded by the straight portion 12 of the bell mouth 10. The flare portion 13 has a flare shape in which the opening diameter gradually increases upward from the straight portion 12. In addition, although the case where the bell mouth 10 has the straight part 12 is illustrated, the flare part 13 is formed on the air inflow part 11, and the air inflow part 11 and the flare part 13 are formed with a continuous curved surface. Good.

  3 is a cross-sectional view taken along the line II of the outdoor unit of the air conditioner of FIG. 4 is a cross-sectional view taken along the line II-II of the outdoor unit of the air conditioner of FIG. As shown in FIGS. 3 and 4, the flare portion 13 includes a first flare portion 13l provided on the first side surface 21 side and a second flare portion 13s provided in the depth direction (arrow Y direction). . The second spread angle αs of the second flare portion 13s is formed to be larger than the first spread angle αl of the first flare portion 13l (αs> αl). The joint portion between the first flare portion 13l and the second flare portion 13s extends along the circumference from the second side surface 2s side of the second spread angle αs toward the first side surface 2l side of the first spread angle αl. It is formed of a curved surface that is continuous in the circumferential direction so that the spread angle gradually decreases.

  With reference to FIGS. 1-4, the flow of the air in the outdoor unit 1 of an air conditioning apparatus is demonstrated. When the blower 4 is activated, air is sucked into the housing 2 from all of the openings 2a. As described above, the distance between the heat exchanger 3 and the blower 4 is longer on the second side surface 2s side than on the first side surface 21 side (ΔDs> ΔDl in FIG. 2). Since the distance between the heat exchanger 3 and the blower 4 is large on the second side surface 2s side of the housing 2, as shown in FIG. 3, the suction flow Fsi to the blower 4 has a large amount of work and a strong centrifugal action. It is attracted to the outer periphery 4P side of the propeller 4b. As a result, the angle of the blowing flow Fso of the air blown from the blower 4 with respect to the rotation axis FC increases.

  On the other hand, the distance between the heat exchanger 3 and the blower 4 is close on the first side surface 21 side of the housing 2, and the suction flow Fli to the blower 4 is forced to a substantially horizontal flow when passing through the heat exchanger 3. Is done. Accordingly, the propeller 4b is attracted to the inner circumference 4I side of the propeller 4b with a small work amount and a weak centrifugal action. As a result, the angle of the blowing flow Flo blown out from the blower 4 with respect to the rotation axis FC becomes small.

  At this time, the second spread angle αs on the second side surface 2s side is formed to be larger than the first spread angle αl in accordance with the characteristics of the air flow blown from the bell mouth 10 (αl> αs). As a result, the air flow becomes easy to follow along the wall surface of the bell mouth 10, and the generation of air vortex as a noise source can be suppressed and the noise can be reduced.

Embodiment 2. FIG.
5 is a cross-sectional view taken along the line II of the outdoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention. FIG. 6 is a cross-sectional view taken along the line II-II of the outdoor unit of the air-conditioning apparatus according to Embodiment 2 of the present invention. It is a figure and the outdoor unit 100 of the air conditioning apparatus which concerns on Embodiment 2 with reference to FIG.5 and FIG.6 is demonstrated. In the outdoor unit 100 of the air conditioner of FIGS. 5 and 6, parts having the same configuration as the outdoor unit 1 of the air conditioner of FIGS. 3 and 4 are denoted by the same reference numerals and description thereof is omitted. To do. In the outdoor unit 100 of the air conditioner of FIGS. 5 and 6, the first spread angle αl and the second spread angle αs are defined in consideration of the positional relationship between the heat exchanger 3 and the blower 4.

  That is, as shown in FIG. 5, on the first side face 21 side of the housing 2, the inner upper end 3U of the heat exchanger 3 and the outer peripheral lower end 4U of the blower 4 are connected by a virtual line, and the virtual line and the rotation axis FC are The angle is defined as a first outflow side angle βl. Similarly, on the first side surface 21 side of the housing 2, the inner upper end 3U of the heat exchanger 3 and the outer peripheral lower end 4U of the blower 4 are connected by a virtual line, and the angle between the virtual line and the rotation axis FC is the second outflow. The side angle is βs. Further, a difference Δβ = βs−βl between the first outflow side angle βl and the second outflow side angle βs is set. At this time, the second spread angle αs on the second side surface 2s side and the first spread angle αl on the first side surface 2l side are formed such that βs> βl and βs + Δβ> αs> αl> βl−Δβ. Yes.

  Here, as described above, the distance between the heat exchanger 3 and the blower 4 is longer on the second side surface 2s side than on the first side surface 21 side. Therefore, as shown in FIGS. 5 and 6, the second outflow side angle βs is larger than the first outflow side angle βl (βs> βl). Then, on the second side surface 2s side of the second outflow side angle βs, the suction flow Fsi (see FIG. 3) is attracted to the outer periphery 4P side where the work of the propeller 4b is large and the centrifugal action is strong, and the blowout flow from the blower 4 The angle of Fso (see FIG. 3) toward the outer periphery 4P increases. Therefore, the second spread angle αs on the second side face 2s side is set larger than the first spread angle αl on the first side face 21 side so that the blowout flow Fo fits.

  On the other hand, on the second side surface 2s side of the first outflow side angle βl, the suction flow Fli (see FIG. 4) is attracted to the inner peripheral 4I side where the work of the propeller 4b is small and the centrifugal action is weak, and the blowout flow from the blower 4 The angle of Flo toward the outer periphery 4P is reduced. Therefore, the first spread angle αl on the first side face 21 is set to be smaller than the second spread angle αs on the second side face 2s so that the blowout flow Fo is suitable.

  However, since the first outflow side angle βl and the second outflow side angle βs are different angles, Δβ, which is the difference between them, can be the maximum amplitude of the angular fluctuations of the suction flows Fsi and Fli. The angular fluctuations of the blowout flows Fso and Flo are also affected by the same effect as the angular fluctuations of the suction flows Fsi and Fli.

  Therefore, by setting βs + Δβ> αs> αl> βl−Δβ, the first spread angle αl and the second spread angle αs are adapted to the angles of the blowout flows Flo and Fso, and the air flow is further along the bell mouth 10 wall surface. This makes it easier to suppress the generation of vortices as noise sources and reduce noise. In particular, when the spread angle and the virtual angle of the flare portion 13 are substantially the same (αl = βl, αs = βs), the suction flow becomes the smoothest.

Embodiment 3 FIG.
FIG. 7 is an II cross-sectional view of the outdoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention, and FIG. 8 is a II-II cross-section of the outdoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention. It is a figure and the outdoor unit 200 of the air conditioning apparatus which concerns on Embodiment 2 with reference to FIG.7 and FIG.8 is demonstrated. In the outdoor unit 200 of the air conditioner of FIGS. 7 and 8, the same reference numerals are given to the parts having the same configuration as the outdoor unit 1 of the air conditioner of FIGS. 3 and 4, and the description thereof is omitted. To do.

  7 and 8, the air inflow portion in the bell mouth 210 is provided on the first air inflow portion 11 l provided on the first side surface 2 l side of the housing 2 and on the second side surface 2 s side of the housing 2. A second air inflow portion 11s. Then, the upstream side (case 2 side) end portion 11x and the downstream side (straight line portion 12 side) end portion 11y of the first air inflow portion 11l and the second air inflow portion 11s are connected by a virtual line. The first inflow side angle γl between the imaginary line on the first side surface 2l side in FIG. 7 and the rotation axis FC, and the second inflow side angle γs between the imaginary line on the second side surface 2s side in FIG. , Γs> γl.

  As described above, the suction flow Fsi (see FIG. 3) on the second side surface 2s side is attracted to the outer periphery 4P side of the propeller 4b having a large amount of work and strong centrifugal action. The air suction flow Fli (see FIG. 4) on the first side face 21 is attracted to the inner circumference 4I side where the work of the propeller 4b is small and the centrifugal action is weak. For this reason, the angle of the suction flow Fsi with respect to the rotation axis FC on the second side face 2s side is larger than the angle of the suction flow Fli on the first side face 21 side with respect to the rotation axis FC. Accordingly, the second inflow side angle γs is formed to be larger than the first inflow side angle γl.

  According to the third embodiment, the air inflow portion 11 of the bell mouth 10 is adapted to the suction airflow angle, and the blowing airflow angle is stabilized. As a result, it becomes easier for the air flow to follow along the wall surface of the bell mouth 10, and the generation of vortex as a noise source can be suppressed and noise can be reduced. Even in this case, the generation of noise can be reduced by having the flare portion 13 as in the first and second embodiments.

Embodiment 4 FIG.
FIG. 9 is a cross-sectional view taken along the line II of the outdoor unit of the air-conditioning apparatus according to Embodiment 4 of the present invention. In addition, in the outdoor unit 300 of the air conditioner of FIG. 9, the same code | symbol is attached | subjected to the site | part which has the same structure as the outdoor unit 1 of the air conditioner of FIG. 3, and the description is abbreviate | omitted.

  In FIG. 9, the propeller 4b of the blower 4 has a shape that is inclined toward the housing 2 by a forward inclination angle δz. Specifically, the chord center line 4c of the propeller 4b is inclined by the forward inclination angle δz on the upstream side (the housing 2 side). FIG. 10 is a developed plan view of a cylindrical section taken along the line III-III in FIG. 9 and centering on the rotation axis FC of the propeller 4b. As shown in FIG. 10, the chord center point 4z is a bisection point of a line segment connecting the blade leading edge 4x and the blade trailing edge 4y. A line segment or a curve connecting the chord center point 4z in the radial direction of the blower 4 is a chord center line 4c in FIG. The angle formed by the straight line connecting the chord center point 4z on the outer periphery 4P of the propeller 4b and the chord center point 4z on the inner periphery 4I and the rotation axis FC is the forward tilt angle δz. The second spread angle αs is larger than the forward tilt angle δz (αs> δz).

  In this way, the blowout flow Fos of the blower 4 is directed in a substantially normal direction of the chord centerline 4c. Therefore, by setting αs> δz, the flow does not collide with the wall surface of the bell mouth 10 and smoothly follows. This makes it easier to reduce the noise by suppressing the generation of vortices as a noise source. Even in this case, the generation of noise can be reduced by having the flare portion 13 as in the first and second embodiments. Furthermore, noise generation can be further reduced by providing the air inflow portion 11 as in the third embodiment.

  Embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made. For example, the flare portion 13 of the bell mouth 10 is illustrated as being formed in a substantially straight shape, but is not limited thereto. FIG. 11 is a cross-sectional view of the bell mouth portion of the outdoor unit of the air conditioner of the present invention. As shown in FIG. 11, the flare portion 13 of the bell mouth 10 may be curved. At this time, the first spread angle αl and the second spread angle αs are expressed as angles formed by a straight line connecting the upstream end 13x and the downstream end 13y and the rotation axis FC.

  Moreover, in each said embodiment, although illustrated about the case where the one air blower 4 is installed in the housing | casing 2, the several air blower 4 may be installed. FIG. 12 is a top view illustrating a plan view of an internal configuration of an outdoor unit of an air conditioner including two propeller fans according to the present invention (bell mouth is not shown). In the case of FIG. 12, the first side surface 21 and the second side surface 2 s are defined based on the length when viewed from one fan, not the length of the rectangular side of the entire housing 2. Specifically, in FIG. 12, the side surface in the depth direction (arrow Y direction) is the first side surface 21 and the width direction (arrow X direction) is the second side surface 2s side.

  1, 100, 200, 300 Outdoor unit of air conditioner, 2 housing, 2a opening, 2l first side, 2s second side, 3 heat exchanger, 3U inner upper end, 4 blower, 4I inner circumference, 4P outer circumference 4U Outer peripheral lower end, 4a boss, 4b propeller, 4c chord center line, 4x blade leading edge, 4y blade trailing edge, 4z chord center point, 10, 210 bell mouth, 11 air inlet, 11l first air inlet 11s 2nd air inflow part, 11x end part, 11y end part, 12 linear part, 13 flare part, 13l 1st flare part, 13s 2nd flare part, 13x upstream end, 13y downstream end, FC rotation axis, ΔDl distance , ΔDs distance, Δβ difference, αl first spread angle, αs second spread angle, βl first outflow side angle, βs second outflow side angle, γl first inflow side angle, γs second inflow side angle, δ z Forward tilt angle.

Claims (6)

A rectangular parallelepiped housing having a first side surface and a second side surface adjacent to the first side surface, each having an opening on the first side surface and the second side surface;
A heat exchanger disposed in the housing;
An air blower that is an upper portion of the housing and is disposed at a position where the distance from the second side surface is larger than the distance from the first side surface, and rotates around a rotation shaft to blow upwards;
A bell mouth provided at the top of the housing so as to surround the blower and having a flare portion formed so as to spread upward;
The flare portion is
Said provided on the first side surface side of the housing, Shi pairs rotary shaft first flared portion inclined at a first spread angle,
Wherein provided on the second side of the housing, it has a second flared portion inclined in the first divergence angle larger than the second spread angle to the rotation axis,
The first spread angle αl and the second spread angle αs are a second outflow side angle formed by a virtual line connecting the inner upper end of the heat exchanger on the second side surface side and the outer peripheral lower end of the blower and the rotating shaft. βs, when the first outflow side angle βl between the imaginary line connecting the inner upper end of the heat exchanger on the first side surface side and the outer peripheral lower end of the blower and the rotation axis, Δβ = βs−βl, βs> An outdoor unit of an air conditioner configured to satisfy βl and βs + Δβ>αs>αl> βl−Δβ . Wherein the first spread angle αl and the first outflow-side angle βl have the same angle, the air according to claim 1 which is the same angle as the first spread angle αl and the first outflow-side angle βl The outdoor unit of the harmony device. The bell mouth has a curved air inflow portion formed so as to narrow as it goes upward from the housing side,
The air inflow portion has a first air inflow portion provided on the first side surface side of the housing and a second air inflow portion provided on the second side surface side of the housing,
The second inflow side angle formed by the imaginary line connecting the upper end and the lower end of the second air inflow portion and the rotation axis is the first angle formed by the imaginary line connecting the upper end and the lower end of the first air inflow portion and the rotation axis. The outdoor unit of the air conditioner according to claim 1 or 2 , wherein the outdoor unit is larger than one inflow side angle. The blower has a boss that rotates about a rotation axis, and a plurality of propellers that are attached to the outer periphery of the boss and tilted toward the housing by a forward tilt angle.
The outdoor unit of an air conditioner according to any one of claims 1 to 3 , wherein the second spread angle is formed larger than the forward tilt angle. The outdoor unit of the air conditioner according to any one of claims 1 to 4 , wherein the first flare portion and the second flare portion are formed in a flat plate shape. The outdoor unit of an air conditioner according to any one of claims 1 to 5 , wherein the first flare portion and the second flare portion are formed in a curved shape.

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