Blower and refrigeration equipment

Abstract

To provide an air blowing device that comprises a rotary member comprising rotor blades, and a stationary member comprising stator blades, and reduces noise while securing the strength of the stator blades.SOLUTION: An outdoor fan unit that is an air blowing device comprises an impeller that is a rotary member, and a stationary guide (55) that is a stationary member. The impeller comprises a plurality of rotor blades. The stationary guide (55) comprises a plurality of stator blades (60), and is arranged on a leeward side of the impeller. The plurality of stator blades (60) of the stationary guide (55) include porous blades (70) partially comprising porous parts (71). The porous blades (70) comprise non-porous parts (72) continuous from blade roots (64) of the porous blades (70) to blade ends (63).SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a blower device and a refrigeration device. [Background technology]

[0002] Patent Document 1 discloses an axial flow fan. In this axial flow fan, a porous portion is provided on the blades (rotor blades) of an impeller. This axial flow fan aims to reduce noise by improving the airflow around the rotor blades with the porous portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 04-272499 Summary of the Invention [Problem to be solved by the invention]

[0004] A known blower device includes a rotating member (impeller) having rotor blades and a fixed member having stator blades. In this blower device, the stator blades are disposed downstream of the impeller, which is a rotating member, and the airflow generated by the impeller is guided by the stator blades.

[0005] However, while the use of porous portions to improve the airflow around rotor blades has been considered in the past, the use of porous portions to improve the airflow around stator vanes has not been sufficiently considered, and the structure for ensuring the strength of stator vanes provided with porous portions has not been sufficiently considered.

[0006] An object of the present disclosure is to reduce noise in a blower device including a rotating member having rotor blades and a fixed member having stator blades by improving the airflow around the stator blades while ensuring the strength of the stator blades. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a blower (40) including a rotating member (50) having a plurality of rotor blades (52) and rotating therearound, and a fixed member (55) having a plurality of stator vanes (60) and arranged on the leeward side of the rotating member (50), wherein the fixed member (55) has a first retaining portion (56) connected to a blade root (64) of the stator vane (60) and a second retaining portion (57) connected to a blade tip (63) of the stator vane (60), and the plurality of stator vanes (60) of the fixed member (55) include a porous vane (70) a portion of which is a porous portion (71), and the porous vane (70) has a non-porous portion (72) that is continuous from the blade root (64) to the blade tip (63) of the porous vane (70).

[0008] In a first embodiment, the plurality of stator vanes (60) of the fixed member (55) include porous vanes (70). A part or all of the plurality of stator vanes (60) of the fixed member (55) are porous vanes (70). The porous vanes (70) have a porous portion (71) in part. The airflow around the porous vanes (70) is improved by the porous portion (71). As a result, the noise of the blower (40) is reduced.

[0009] Moreover, the porous blade (70) of the first embodiment has a nonporous portion (72). The nonporous portion (72) is continuous from the blade root (64) of the porous blade (70) connected to the first retaining portion (56) to the blade tip (63) of the porous blade (70) connected to the second retaining portion (57). Therefore, by providing the nonporous portion (72), which has a higher strength than the porous portion (71), from the blade root (64) to the blade tip (63) of the porous blade (70), the strength of the porous blade (70) is ensured.

[0010] A second aspect of the present disclosure is the first aspect, wherein one or both of the leading edge (61) and the trailing edge (62) of the porous vane (70) are formed by the non-porous portion (72).

[0011] In the porous vane (70) of the second embodiment, the non-porous portion (72) forms one or both of the leading edge (61) and the trailing edge (62) of the porous vane (70).

[0012] A third aspect of the present disclosure is the first aspect, wherein the porous blade (70) has a plurality of the porous portions (71), and the non-porous portions (72) are provided between adjacent ones of the porous portions (71).

[0013] In the porous blade (70) of the third embodiment, a non-porous portion (72) is provided between adjacent porous portions (71).

[0014] A fourth aspect of the present disclosure is any one of the first to third aspects, wherein the porous portion (71) is provided from the positive pressure surface (65) to the negative pressure surface (66) of the porous blade (70), and pores are formed in the porous portion (71) from the positive pressure surface (65) to the negative pressure surface (66) of the porous blade (70).

[0015] In the fourth embodiment of the porous blade (70), the porous portion (71) is provided from the pressure surface (65) to the suction surface (66) of the porous blade (70). Pressure fluctuations caused by vortices in the airflow flowing near the pressure surface (65) are transmitted to the suction surface (66) through gaps in the porous portion (71). This suppresses the growth of vortices in the airflow flowing near the pressure surface (65).

[0016] A fifth aspect of the present disclosure is the first aspect, wherein the porous portion (71) is provided so as to cover a surface of the non-porous portion (72).

[0017] In the porous blade (70) of the fifth embodiment, the surface of the non-porous portion (72) is covered with the porous portion (71).

[0018] A sixth aspect of the present disclosure is any one of the first to fifth aspects, wherein the plurality of stator vanes (60) provided on the fixed member (55) include a non-porous vane (75) whose entirety is a non-porous portion (72).

[0019] In a sixth embodiment, the stationary member (55) is provided with both porous wings (70) and non-porous wings (75).

[0020] A seventh aspect of the present disclosure is a refrigeration system (10) including: the air blower (40) according to any one of the first to sixth aspects; and a heat exchanger (23) that exchanges heat between the air supplied by the air blower (40) and a heat medium.

[0021] In a seventh aspect, the air blower (40) according to any one of the first to sixth aspects is provided in a refrigeration system (10). [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a piping diagram showing a refrigerant circuit of an air conditioner according to a first embodiment. [Diagram 2] FIG. 2 is a plan view of the outdoor unit of the first embodiment, showing a state in which the top plate of the casing is omitted. [Diagram 3] FIG. 3 is a perspective view of the impeller and fixed guide that constitute the outdoor fan unit of the first embodiment, showing a state in which the impeller and the fixed guide are assembled together. [Figure 4] FIG. 4 is a perspective view of the impeller of the outdoor fan unit of the first embodiment. [Diagram 5] FIG. 5 is a perspective view of a fixed guide of the outdoor fan unit of the first embodiment. [Figure 6] FIG. 6 is an enlarged perspective view of a part of the fixed guide of the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view of the stator vane (multi-hole vane) showing a cross section taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a stator vane (multi-hole vane) according to a modified example of the first embodiment, and shows a cross section corresponding to FIG. [Figure 9] FIG. 9 is an enlarged perspective view of a part of the fixed guide of the second embodiment. [Figure 10] FIG. 10 is an enlarged perspective view of a part of a fixed guide according to a modified example of the second embodiment. [Figure 11] FIG. 11 is an enlarged perspective view of a part of the fixed guide of the third embodiment. [Figure 12]FIG. 12 is an enlarged perspective view of a part of the fixed guide of the fourth embodiment. [Figure 13] FIG. 13 is a cross-sectional view of the vane (multi-hole vane) of the fifth embodiment, and shows a cross section corresponding to FIG. [Figure 14] FIG. 14 is a cross-sectional view of a stator vane (multi-hole vane) according to a modification of the fifth embodiment, and shows a cross section corresponding to FIG. [Figure 15] FIG. 15 is a perspective view of a fixed guide according to a first modified example of the other embodiment. [Figure 16] FIG. 16 is a cross-sectional view of a stator blade of a reference example, and shows a cross section corresponding to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] First Embodiment A first embodiment will be described below. The present embodiment is an air conditioner (10). The air conditioner (10) is a refrigeration device that operates in a refrigeration cycle.

[0024] -Air conditioning equipment- As shown in FIG. 1, the air conditioner (10) includes an outdoor unit (11) and an indoor unit (12).

[0025] <Outdoor unit> The outdoor unit (11) is installed outdoors and includes a compressor (21), a four-way switching valve (22), an outdoor heat exchanger (23), an expansion valve (24), a liquid-side shut-off valve (26), a gas-side shut-off valve (27), and an outdoor fan unit (40).

[0026] The compressor (21) is, for example, a scroll or rotary type hermetic compressor. The outdoor heat exchanger (23) is a heat exchanger that exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger (23) is, for example, a fin-and-tube air heat exchanger. The expansion valve (24) is an electrically operated expansion valve whose opening degree is variable.

[0027] The four-way switching valve (22) is a valve for switching the flow path of the refrigerant in the refrigerant circuit (15). The four-way switching valve (22) switches between a first state shown by a solid line in Fig. 1 and a second state shown by a dashed line in Fig. 2. In the first state, the first port communicates with the third port, and the second port communicates with the fourth port. In the second state, the first port communicates with the fourth port, and the second port communicates with the third port.

[0028] <Indoor unit> The indoor unit (12) is installed in a room, which is a space to be air-conditioned. The indoor unit (12) has an indoor heat exchanger (25) and an indoor fan (13). The indoor heat exchanger (25) exchanges heat between the refrigerant and the indoor air. The indoor heat exchanger (25) is a fin-and-tube type air heat exchanger.

[0029] <Refrigerant circuit> In the air conditioner (10), an outdoor unit (11) and an indoor unit (12) are connected to each other via a pair of communication pipes (16, 17). In the air conditioner (10), the outdoor unit (11), the indoor unit (12), and the communication pipes (16, 17) form a refrigerant circuit (15) that performs a vapor compression refrigeration cycle.

[0030] In the refrigerant circuit (15), a discharge pipe of the compressor (21) is connected to a first port of a four-way switching valve (22), and a suction pipe of the compressor (21) is connected to a second port of the four-way switching valve (22). In the refrigerant circuit (15), an outdoor heat exchanger (23) and an expansion valve (24) are arranged in this order from a third port of the four-way switching valve (22) toward a liquid side stop valve (26). A gas side stop valve (27) is connected to a fourth port of the four-way switching valve (22). The liquid side stop valve (26) is connected to a liquid side end of the indoor heat exchanger (25) via a liquid side connecting pipe (16). The gas side stop valve (27) is connected to a gas side end of the indoor heat exchanger (25) via a gas side connecting pipe (17).

[0031] -Air conditioning unit operation- The air conditioner (10) performs cooling operation and heating operation.

[0032] <Cooling operation> In the cooling operation, the four-way switching valve (22) is set to the first state, and the refrigerant circulates in the refrigerant circuit (15). In the refrigerant circuit (15), the outdoor heat exchanger (23) functions as a condenser, and the indoor heat exchanger (25) functions as an evaporator. The indoor unit (12) cools air drawn from the indoor space in the indoor heat exchanger (25) and blows the cooled air into the indoor space.

[0033] <Heating operation> In the heating operation, the four-way switching valve (22) is set to the second state, and the refrigerant circulates in the refrigerant circuit (15). In the refrigerant circuit (15), the indoor heat exchanger (25) functions as a condenser, and the outdoor heat exchanger (23) functions as an evaporator. The indoor unit (12) heats air drawn from the indoor space in the indoor heat exchanger (25) and blows the heated air into the indoor space.

[0034] -Outdoor unit structure- As shown in Fig. 2, the outdoor unit (11) includes a rectangular parallelepiped casing (30). The casing (30) has an inlet (31) formed on the back and left side, and an outlet (32) formed on the front. An outlet grill (33) is provided on the front of the casing (30). The outlet grill (33) covers the outlet (32).

[0035] A partition plate (34) is provided in the internal space of the casing (30). The partition plate (34) divides the internal space of the casing (30) into an equipment chamber (36) on the right side and an air passage (35) in the remaining portion. The equipment chamber (36) accommodates the compressor (21) and the like. The air passage (35) communicates with the suction port (31) and the air outlet (32). The air passage (35) accommodates the outdoor heat exchanger (23) and the outdoor fan unit (40).

[0036] The outdoor heat exchanger (23) is formed in an L-shape in a plan view. The outdoor heat exchanger (23) is provided along the back surface and left side surface of the casing (30) and faces the inlet (31). The outdoor fan unit (40) is provided downstream of the outdoor heat exchanger (23) in the air passage (35).

[0037] -Outdoor fan unit configuration- 2, the outdoor fan unit (40) includes an impeller (50), an electric motor (41), and a fixed guide (55). The outdoor fan unit (40) is a blower including the impeller (50) which is a rotating member, and the fixed guide (55) which is a fixed member.

[0038] The electric motor (41) is connected to the impeller (50) and drives the impeller (50) to rotate. The electric motor (41) is fixed to the outdoor heat exchanger (23) via a support base (37). The fixed guide (55) is disposed downstream of the impeller (50). The fixed guide (55) is disposed to face the air outlet (32) of the casing (30). The fixed guide (55) is fixed to the casing (30) or the air outlet grill (33).

[0039] Impeller 3 and 4, the impeller (50) includes a hub (51) and three rotor blades (52). The impeller (50) is a propeller fan. The impeller (50) is a rotating member that is rotated by the electric motor (41). The number of rotor blades (52) included in the impeller (50) is merely an example.

[0040] The hub (51) is a cylindrical part whose front end is closed. The hub (51) is connected to the output shaft of the electric motor (41). The hub (51) is disposed coaxially with the output shaft of the electric motor (41).

[0041] Each of the rotor blades (52) protrudes from the outer circumferential surface of the hub (51) and extends radially outward from the hub (51). The rotor blades (52) are arranged at regular angular intervals in the circumferential direction of the hub (51).

[0042] The impeller (50) is a resin component formed by injection molding. The impeller (50) is integrally formed with one hub (51) and three rotor blades (52). The hub (51) and each of the rotor blades (52) are made of non-porous resin.

[0043] < Fixed guide> As shown in FIGS. 3 and 5, the fixed guide (55) includes a hub (56), eleven stator vanes (60), and an outer circumferential ring (57).

[0044] The hub (56) is a cylindrical portion with closed ends. The hub (56) is disposed substantially coaxially with the hub (51) of the impeller (50). The outer diameter of the hub (56) is approximately equal to the outer diameter of the hub (51) of the impeller (50). The material of the hub (56) is a non-porous resin. The hub (56) is connected to the blade roots (64) of all the stator blades (60). The hub (56) includes a first retainer hub (56) that is connected to the blade roots (64) of the stator blades (60). In the department be.

[0045] The outer circumferential ring (57) is a ring-shaped or short cylindrical portion. The outer circumferential ring (57) is disposed substantially coaxially with the hub (56). The inner diameter of the outer circumferential ring (57) is larger than the outer diameter of the impeller (50). The material of the outer circumferential ring (57) is a non-porous resin. The outer circumferential ring (57) connects to the blade tips (63) of all the stator blades (60). The outer circumferential ring (57) connects to the blade tips (63) of the stator blades (60). 2nd holding part It is.

[0046] Each stator vane (60) protrudes from the outer circumferential surface of the hub (56) and extends radially outward from the hub (56). Each stator vane (60) is provided from the hub (56) to the outer circumferential ring (57). Each stator vane (60) has a blade root (64) fixed to the hub (56) and a blade tip (63) fixed to the outer circumferential ring (57). Each stator vane (60) is arranged at regular angular intervals in the circumferential direction of the hub (56).

[0047] As shown in Fig. 6, each stator blade (60) has one porous portion (71) and one non-porous portion (72). Each stator blade (60) is a porous blade (70) that is partially constituted by the porous portion (71). In the fixed guide (55) of the present embodiment, all of the stator blades (60) are porous blades (70).

[0048] In the porous blade (70) of this embodiment, the nonporous portion (72) is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70). In other words, the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70) of this embodiment are formed by the nonporous portion (72). The nonporous portion (72) is a portion in which substantially no pores are formed. The nonporous portion (72) of this embodiment is a solid portion made of resin.

[0049] In the porous blade (70) of this embodiment, the porous portion (71) is provided inside the frame-shaped non-porous portion (72). In other words, the porous portion (71) of this embodiment is surrounded by the frame-shaped non-porous portion (72).

[0050] A large number of pores are formed in the porous portion (71) constituting each of the porous blades (70). The average diameter of the pores in the porous portion (71) is, for example, 140 μm. The average diameter of the pores in the porous portion (71) is preferably, for example, 15 μm or more and 300 μm or less. The porosity of the porous portion (71) (=total volume of pores / total volume of the porous portion) is, for example, 48%. The porosity of the porous portion (71) is preferably, for example, 35% or more and 90% or less.

[0051] In the cross section of the stator vane (60) shown in FIG. 7, the right end is the leading edge (61), the left end is the trailing edge (62), the upper surface is the pressure surface (65), and the lower surface is the suction surface (66). In the stator vane (60) of this embodiment, the portion between the "non-porous portion (72) along the leading edge (61)" and the "non-porous portion (72) along the trailing edge (62)" is the porous portion (71). Therefore, the porous portion (71) constituting the porous vane (70) extends from the pressure surface (65) to the suction surface (66) of the porous vane (70). The pores formed in the porous portion (71) are continuous from the pressure surface (65) to the suction surface (66) of the porous vane (70).

[0052] The porous portion (71) constituting the perforated blade (70) is formed by filling a metal mold with minute resin pellets and heating them. When the resin pellets filled in the metal mold are heated, adjacent resin pellets are welded to each other at the contact portions, and the resin pellets in the metal mold are joined to each other. In this way, the resin porous portion (71) having a large number of minute pores is formed.

[0053] The fixed guide 55 is formed by so-called insert molding. Specifically, the eleven stator vanes 60 are placed at predetermined positions in a mold, and the mold is filled with resin to form the hub 56 and the outer circumferential ring 57, which are then joined to the stator vanes 60.

[0054] As described above, in the fixed guide (55) of this embodiment, all the stator vanes (60) are porous vanes (70). In the porous vanes (70) of this embodiment, the portion along the leading edge (61) and the portion along the trailing edge (62) are each a continuous non-porous portion (72) extending from the blade root (64) to the blade tip (63). Thus, in each porous vane (70) of the fixed guide (55), the non-porous portion (72) is provided extending from the blade root (64) to the blade tip (63), one end of the non-porous portion (72) is joined to the hub (56), and the other end of the non-porous portion (72) is joined to the outer peripheral ring (57).

[0055] -Outdoor fan unit operation- The impeller (50) is driven by the electric motor (41) and rotates in the direction indicated by the arrow in Fig. 4 (counterclockwise when viewed from the front). By rotating in this direction, the impeller (50) draws in air that has passed through the outdoor heat exchanger (23) and blows the drawn-in air toward the fixed guide (55).

[0056] The air blown out from the impeller (50) swirls in the rotational direction of the impeller (50). This swirling air flow is guided by the stationary blades (60) of the fixed guide (55) and its direction is changed to the front direction of the fixed guide (55) (in other words, toward the air outlet of the casing (30)). The air that has passed through the fixed guide (55) is blown out of the casing (30) through the air outlet (32).

[0057] <Noise reduction effect of perforated blades> In the fixed guide (55), air flows along the surface of the stator blade (60) from the leading edge (61) to the trailing edge (62) of the stator blade (60). In the stator blade (60), airflow separation occurs on the way from the leading edge (61) to the trailing edge (62). When airflow separation occurs, a vortex is generated, and the vortex generates noise.

[0058] The separation of the airflow flowing along the pressure surface (65) of the stator vane (60) starts at a region between the leading edge (61) and the trailing edge (62). When a vortex occurs near the pressure surface (65) of the stator vane (60) due to the separation of the airflow, pressure fluctuates near the pressure surface (65), causing a localized increase in pressure.

[0059] On the other hand, in the fixed guide (55) of this embodiment, all the stator vanes (60) are porous vanes (70). In each porous vane (70), a porous portion (71) is disposed in a region intermediate the leading edge (61) and the trailing edge (62). In the porous portion (71), pores are formed extending from the pressure side (65) to the suction side (66) of the porous vane (70).

[0060] Therefore, the locally increased pressure near the pressure surface (65) of the porous vane (70) is released to the suction pressure surface (66) of the stator vane (60) through the pores in the porous portion (71). As a result, the pressure fluctuation near the pressure surface (65) of the stator vane (60) is attenuated, the growth of vortices near the pressure surface (65) is suppressed, and noise caused by vortices near the pressure surface (65) is reduced.

[0061] -Feature (1) of embodiment 1- In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all of the stator vanes (60) are porous vanes (70). In the fixed guide (55) of this embodiment, each of the porous vanes (70) has one porous portion (71) and one non-porous portion (72).

[0062] The non-porous portion (72) of this embodiment is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70). Therefore, the non-porous portion (72) having a higher strength than the porous portion (71) is arranged along the periphery of the porous blade (70). In particular, in each porous blade (70) of the fixed guide (55) of this embodiment, the non-porous portion (72) is provided from the blade root (64) to the blade tip (63), one end of the non-porous portion (72) is joined to the hub (56), and the other end of the non-porous portion (72) is joined to the outer circumferential ring (57). Therefore, the non-porous portion (72) having a higher strength than the porous portion (71) is provided from the blade root (64) to the blade tip (63), and is joined to the hub (56) and the outer circumferential ring (57). Therefore, according to this embodiment, the strength of the porous vane (70) can be ensured, and as a result, the strength of the entire fixed guide (55) can be ensured.

[0063] -Feature (2) of embodiment 1- As described above, the starting point of separation of the airflow flowing along the pressure surface (65) of the stator vane (60) is located in the region between the leading edge (61) and the trailing edge (62). On the other hand, in the porous vane (70) of the present embodiment, the porous portion (71) is disposed in the region between the leading edge (61) and the trailing edge (62). Therefore, in the porous vane (70) of the present embodiment, the region of the pressure surface (65) of the porous vane (70) where the starting point of separation of the airflow is located can be formed by the porous portion (71). Therefore, it is possible to suppress the growth of vortices generated by separation of the airflow, and to reduce noise caused by vortices near the pressure surface (65) of the porous vane (70).

[0064] Therefore, according to the present embodiment, the portion along the periphery of the porous blade (70) is made of a non-porous portion (72), thereby ensuring the strength of the porous blade (70), while the growth of vortices caused by airflow separation can be suppressed by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.

[0065] -Modification of the first embodiment- As shown in Fig. 8, in the porous blade (70) of this embodiment, the porous portion (71) may be provided only in the region close to the leading edge of the porous blade (70). In the porous blade (70) of this modification, the porous portion (71) is provided between a center line (C) in the width direction of the porous blade (70) and the leading edge (61). The center line (C) in the width direction of the porous blade (70) is a line connecting the midpoints of the chord lines (67) in each cross section from the blade root (64) to the blade tip (63).

[0066] The starting point of separation of the airflow flowing along the pressure surface (65) of the stator vane (60) is often located in a region between the leading edge (61) and the center line (C). Therefore, in the porous vane (70) of this modification, as in the porous vane (70) shown in Figs. 6 and 7, the region of the pressure surface (65) of the porous vane (70) where the starting point of separation of the airflow is located can be formed by the porous portion (71). Therefore, in this modification, the strength of the porous vane (70) can be ensured by providing the non-porous portion (72), and the growth of vortices caused by separation of the airflow can be suppressed by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.

[0067] Second Embodiment A description will now be given of the second embodiment. The air conditioner (10) of the second embodiment is obtained by modifying the fixed guide (55) of the outdoor fan unit (40) in the air conditioner (10) of the first embodiment. Here, the fixed guide (55) of the second embodiment will be described, focusing mainly on the differences from the fixed guide (55) of the first embodiment.

[0068] As shown in Fig. 9, in the fixed guide (55) of this embodiment, each of the porous blades (70) has one porous portion (71) and one non-porous portion (72) similar to the porous blade (70) of the first embodiment. In the porous blade (70) of this embodiment, approximately half of the leading edge (61) side in the width direction of the porous blade (70) is the porous portion (71), and approximately half of the remaining trailing edge (62) side is the non-porous portion (72). In the porous blade (70) of this embodiment, each of the porous portion (71) and the non-porous portion (72) extends from the blade root (64) to the blade tip (63) of the porous blade (70). One end of each of the porous portion (71) and the non-porous portion (72) is joined to the hub (56), and the other end of each of the porous portion (71) and the non-porous portion (72) is joined to the outer peripheral ring (57).

[0069] In the porous blade (70) of the present embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as those of the porous portion (71) and the non-porous portion (72) of embodiment 1. In the porous blade (70) of the present embodiment, the porous portion (71) extends from the pressure surface (65) to the suction surface (66) of the porous blade (70). Moreover, the pores formed in the porous portion (71) are continuous from the pressure surface (65) to the suction surface (66) of the porous blade (70).

[0070] -Features of the second embodiment- In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all of the stator blades (60) are porous blades (70). In each of the porous blades (70), a non-porous portion (72) is provided from the blade root (64) to the blade tip (63) of the porous blade (70). Therefore, the entire portion along the trailing edge (62) of the porous blade (70) is formed of the non-porous portion (72) having a strength greater than that of the porous portion (71), thereby ensuring the strength of the porous blade (70).

[0071] As described above, the starting point of separation of the airflow flowing along the pressure surface (65) of the stationary vane (60) is often located in the middle region between the leading edge (61) and the center line (C). On the other hand, in the porous vane (70) of the present embodiment, approximately half of the leading edge (61) side in the width direction of the porous vane (70) is the porous portion (71). Therefore, in the porous vane (70) of the present embodiment, as in the first embodiment, the region of the pressure surface (65) of the porous vane (70) where the starting point of separation of the airflow is located can be formed by the porous portion (71). Therefore, according to the present embodiment, the strength of the porous vane (70) can be ensured by providing the non-porous portion (72), while the growth of vortexes caused by separation of the airflow can be suppressed by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.

[0072] -Modification of the second embodiment- As shown in FIG. 10, in the porous blade (70) of the present embodiment, approximately half of the porous blade (70) on the leading edge (61) side in the width direction may be composed of a non-porous portion (72), and approximately half of the remaining porous blade (70) on the trailing edge (62) side may be composed of a porous portion (71).

[0073] Third Embodiment A third embodiment will be described. The air conditioner (10) of the third embodiment is an air conditioner (10) of the air conditioner (10) of the first embodiment, in which the fixed guide (55) of the outdoor fan unit (40) is changed. Here, the fixed guide (55) of the third embodiment will be described, mainly focusing on the differences from the fixed guide (55) of the first embodiment.

[0074] As shown in Fig. 11, in the fixed guide (55) of the present embodiment, each porous blade (70) has one porous portion (71) and one non-porous portion (72), similar to the porous blade (70) of the first embodiment. In the porous blade (70) of the present embodiment, the portion on the blade tip (63) side of the porous blade (70) including the corner on the leading edge side is the porous portion (71), and the remaining portion on the blade root (64) side is the non-porous portion (72). In the porous blade (70) of the present embodiment, the non-porous portion (72) is continuous from the blade root (64) to the blade tip (63) of the porous blade (70).

[0075] In the porous blade (70) of the present embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as those of the porous portion (71) and the non-porous portion (72) of embodiment 1. In the porous blade (70) of the present embodiment, the porous portion (71) extends from the pressure surface (65) to the suction surface (66) of the porous blade (70). Moreover, the pores formed in the porous portion (71) are continuous from the pressure surface (65) to the suction surface (66) of the porous blade (70).

[0076] -Features of the third embodiment- In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all of the stator blades (60) are porous blades (70). In each porous blade (70), a portion extending from the blade root (64) to the blade tip (63) of the porous blade (70) is formed of a non-porous portion (72) having strength greater than that of the porous portion (71). Therefore, according to this embodiment, the strength of the porous blade (70) can be ensured.

[0077] Here, the speed of the airflow sent from the impeller (50) is higher toward the outer periphery of the impeller (50). Therefore, a relatively high-speed airflow blown out from near the outer periphery of the impeller (50) flows into a region of the stator blade (60) closer to the blade tip (63). Therefore, in each stator blade (60), airflow separation is more likely to occur in the region closer to the blade tip (63) than in the region closer to the blade root (64).

[0078] On the other hand, in each of the porous blades (70) of the present embodiment, the region close to the blade tip (63) is formed of the porous portion (71). Therefore, the porous portion (71) can have an effect of suppressing the growth of vortices in the region close to the blade tip (63) of the porous blade (70) where airflow separation is likely to occur. Therefore, according to the present embodiment, the strength of the porous blade (70) is ensured by providing the non-porous portion (72), while the growth of vortices caused by airflow separation can be suppressed by the porous portion (71), and as a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.

[0079] Fourth Embodiment A fourth embodiment will be described. The air conditioner (10) of the present embodiment is the air conditioner (10) of the first embodiment, except that the fixed guide (55) of the outdoor fan unit (40) is changed. Here, the fixed guide (55) of the present embodiment will be described, mainly focusing on the differences from the fixed guide (55) of the first embodiment.

[0080] As shown in Fig. 12, in the fixed guide (55) of this embodiment, each porous blade (70) has a plurality of porous portions (71) (six in this embodiment) and one non-porous portion (72). In each porous blade (70) of this embodiment, the non-porous portion (72) is formed in a lattice pattern. The plurality of porous portions (71) are fitted into the lattice-shaped non-porous portion (72). In each porous blade (70) of this embodiment, the plurality of porous portions (71) are arranged in a direction from the leading edge (61) to the trailing edge (62) of the porous blade (70) and in a direction from the blade root (64) to the blade tip (63) of the porous blade (70).

[0081] Thus, in each porous blade (70), a plurality of porous portions (71) are arranged at intervals from one another, and a non-porous portion (72) is provided between adjacent porous portions (71). In each porous blade (70), similarly to the first embodiment, the portion along the leading edge (61) and the portion along the trailing edge (62) are each formed by a continuous non-porous portion (72) from the blade root (64) to the blade tip (63).

[0082] In the porous blade (70) of the present embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as those of the porous portion (71) and the non-porous portion (72) of embodiment 1. In the porous blade (70) of the present embodiment, each porous portion (71) extends from the pressure surface (65) to the suction surface (66) of the porous blade (70). Moreover, the pores formed in each porous portion (71) are continuous from the pressure surface (65) to the suction surface (66) of the porous blade (70).

[0083] -Features of the fourth embodiment- In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stator blades (60) are porous blades (70). Each porous blade (70) is provided with a lattice-shaped nonporous portion (72), and a plurality of porous portions (71) are fitted into the lattice-shaped nonporous portion (72). Therefore, by forming the nonporous portion (72) having a strength greater than that of the porous portion (71) in a lattice shape, the strength of the porous blade (70) can be ensured. In addition, since the plurality of porous portions (71) are fitted into the lattice-shaped nonporous portion (72), the plurality of porous portions (71) can be reliably held by the nonporous portion (72).

[0084] Also in the porous blade (70) of the present embodiment, the region of the pressure surface (65) of the porous blade (70) where the starting point of airflow separation is located can be formed by the porous portion (71). Thus, according to the present embodiment, the strength of the porous blade (70) is ensured by providing the non-porous portion (72), while the growth of vortexes caused by airflow separation can be suppressed by the porous portion (71), and as a result, noise generated by the operation of the outdoor fan unit (40) can be reduced.

[0085] Fifth embodiment A fifth embodiment will be described. The air conditioner (10) of the fifth embodiment is an air conditioner (10) of the air conditioner (10) of the first embodiment, in which the fixed guide (55) of the outdoor fan unit (40) is changed. Here, the fixed guide (55) of the fifth embodiment will be described, focusing mainly on the differences from the fixed guide (55) of the first embodiment.

[0086] As shown in FIG. 13, in the fixed guide (55) of the present embodiment, each of the porous blades (70) has one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the second embodiment. The porous blade (70) of the present embodiment is mostly made of the non-porous portion (72). The non-porous portion (72) of the present embodiment extends from the blade root (64) to the blade tip (63) of the porous blade (70) and from the leading edge (61) to the trailing edge (62) of the porous blade (70). The porous portion (71) of the present embodiment is formed in a thin plate shape and covers the upper surface of the non-porous portion (72) in FIG. 13. In the porous blade (70) of the present embodiment, the entire positive pressure surface (65) is formed by the porous portion (71), and the entire negative pressure surface (66) is formed by the non-porous portion (72).

[0087] In the porous blade (70) of the present embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as those of the porous portion (71) and the non-porous portion (72) of embodiment 1. However, the porous portion (71) of the present embodiment forms only the pressure side (65) of the porous blade (70) and does not form the negative pressure side (66) of the porous blade (70).

[0088] -Features of the fifth embodiment- In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stator vanes (60) are porous vanes (70). In each of the porous vanes (70) of the fixed guide (55) of this embodiment, the pressure surface (65) of the porous vane (70) is formed by the porous portion (71). Therefore, pressure fluctuations caused by vortexes generated near the pressure surface (65) of the porous vane (70) are attenuated by the action of the pores in the porous portion (71) that forms the pressure surface (65). Therefore, according to this embodiment, it is possible to reduce noise generated in association with the operation of the outdoor fan unit (40).

[0089] -Modification of the fifth embodiment- As shown in Fig. 14, in each porous vane (70) of the fixed guide (55) of this embodiment, the porous portion (71) may be provided so as to cover the underside of the non-porous portion (72) in Fig. 14. In the porous vane (70) of this modification, the entire positive pressure surface (65) is formed by the non-porous portion (72), and the entire negative pressure surface (66) is formed by the porous portion (71).

[0090] Although not shown, in each porous vane (70) of the fixed guide (55) of this modified example, the porous portion (71) may be provided so as to cover the entire surface of the non-porous portion (72). In the porous vane (70) of this modified example, both the positive pressure surface (65) and the negative pressure surface (66) are formed by the porous portion (71).

[0091] Other Embodiments -First Modification- In the outdoor fan unit (40) of each of the above embodiments, the stator vanes (60) constituting the fixed guide (55) may include both the porous vanes (70) and the non-porous vanes (75). In the fixed guide (55) of this modification, some of the multiple stator vanes (60) constituting the fixed guide (55) are porous vanes (70), and the rest are non-porous vanes (75). The non-porous vanes (75) are stator vanes (60) entirely made up of non-porous portions (72).

[0092] As shown in Fig. 15, in the fixed guide (55) of this modification, the order of arrangement of the porous vanes (70) and the non-porous vanes (75) in the circumferential direction of the fixed guide (55) may be irregular. By making the intervals between the porous vanes (70) in the circumferential direction of the fixed guide (55) irregular, it may be possible to reduce periodically varying components of the noise generated in association with the operation of the outdoor fan unit (40). Note that Fig. 15 shows the fixed guide (55) of the first embodiment to which this modification is applied.

[0093] -Second modified example- In the outdoor fan unit (40) of each of the above-described embodiments, a part or the entirety of the rotor blades (52) constituting the impeller (50) may be the porous portion (71).

[0094] -Third Modification- In each of the above embodiments, an example has been described in which the blower is used as the outdoor fan unit (40) of the air conditioner (10), but the use of the blower is not limited to the outdoor fan unit (40). Examples of uses of the blower include an indoor fan unit provided in an indoor unit of an air conditioner, an internal fan unit of a container refrigeration unit, and the like.

[0095] 《Reference example》 In the outdoor fan unit (40) of any of the first to fourth embodiments, the stationary blade (60) of the fixed guide (55) may be formed with a plurality of small diameter holes (100) instead of the porous portion (71).

[0096] 16 shows an application of this reference example to the stator vane (60) of the first embodiment. Each small hole (100) is a through hole penetrating the stator vane (60) in the thickness direction. One end of each small hole (100) opens to the pressure surface (65) of the stator vane (60) and the other end opens to the suction surface (66) of the stator vane (60). The diameter of each small hole (100) is, for example, 0.3 mm or less.

[0097] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. In addition, the elements of the above embodiments, modifications, and other embodiments may be appropriately combined or substituted. In addition, the descriptions "first," "second," "third," etc. in the specification and claims are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0098] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for a blower device and a refrigeration device. [Explanation of symbols]

[0099] 10 Air conditioning equipment (refrigeration equipment) 23 Outdoor heat exchanger (heat exchanger) 40 Outdoor fan unit (blower) 50 Impeller (rotating part) 52 Moving blade 55 Fixed guide (fixed member) 60 Stator blade 61 Leading Edge 62 Trailing edge 63 Wingtip 64 Wing base 65 Pressure surface 66 Suction surface 70 perforated wing 71 Porous part 72 Non-porous part 75 Non-porous wing

Claims

1. a rotating member (50) having a plurality of rotor blades (52) and rotating; A blower (40) including a plurality of stator vanes (60) and a fixed member (55) disposed on the leeward side of the rotating member (50), The fixing member (55) has a first retaining portion (56) connected to a blade root (64) of the stator blade (60) and a second retaining portion (57) connected to a blade tip (63) of the stator blade (60), The plurality of stator vanes (60) of the fixed member (55) include porous vanes (70) each having a porous portion (71), The porous blade (70) includes a non-porous portion (72) extending continuously from the blade base (64) to the blade tip (63) of the porous blade (70), The non-porous portion (72) is connected to each of the first holding portion (56) and the second holding portion (57). Blower device.

2. One or both of the leading edge (61) and the trailing edge (62) of the porous blade (70) are formed by the non-porous portion (72). The blower device according to claim 1 .

3. The porous blade (70) includes a plurality of the porous portions (71), The non-porous portion (72) is provided between the adjacent porous portions (71). The blower device according to claim 1 .

4. The porous portion (71) is provided from the positive pressure surface (65) to the negative pressure surface (66) of the porous blade (70), In the porous portion (71), pores are formed extending from the pressure surface (65) to the suction surface (66) of the porous blade (70). The blower device according to any one of claims 1 to 3.

5. The porous portion (71) is provided so as to cover the surface of the non-porous portion (72). The blower device according to claim 1 .

6. The plurality of stationary vanes (60) provided on the fixed member (55) include a non-porous vane (75) whose entirety is a non-porous portion (72). The blower device according to claim 1, 2, 3 or 5.

7. The entire portion of the porous blade (70) connected to the second retaining portion (57) is constituted by the non-porous portion (72). The blower device according to claim 1, 2, 3 or 5.

8. A rotating member (50) having a plurality of rotor blades (52) and rotating; A blower (40) including a plurality of stator vanes (60) and a fixed member (55) disposed on the leeward side of the rotating member (50), The fixing member (55) has a first retaining portion (56) connected to a blade root (64) of the stator blade (60) and a second retaining portion (57) connected to a blade tip (63) of the stator blade (60), the plurality of stator vanes (60) of the fixed member (55) each include a plurality of porous vanes (70) each having a porous portion (71) and a plurality of non-porous vanes (75) each having a non-porous portion (72) entirely; The porous blade (70) includes a non-porous portion (72) extending continuously from the blade base (64) to the blade tip (63) of the porous blade (70), The number of the non-porous blades (75) arranged between two adjacent porous blades (70) in the circumferential direction of the fixed member (55) is non-uniform. Blower device.

9. A blower (40) according to claim 1, 2, 3, 5 or 8; and a heat exchanger (23) for exchanging heat between the air supplied by the air blower (40) and a heat medium. Refrigeration equipment.

Images