WO2018096658A1 - Blower, outdoor unit，and refrigeration cycle device - Google Patents

Abstract

This blower has: a hollow cylindrical shaft section provided on a rotation axis; a ring section provided on the outer peripheral side of the shaft section so as to be centered on the rotation axis; a plurality of first blades provided outside the ring section in the radial direction of the ring section; a plurality of second blades provided between the shaft section and the ring section in the radial direction of the ring section; a plate-shaped connection section provided adjacent to the shaft section and connecting two circumferentially adjacent second blades of the plurality of second blades; and a plurality of third blades provided either on the downstream blade surfaces of the plurality of second blades or on the downstream surface of the connection section and connected to the shaft section.

Description

Blower, outdoor unit and refrigeration cycle apparatus

The present invention relates to an axial flow type blower, an outdoor unit, and a refrigeration cycle apparatus.

In Patent Document 1, a rotating shaft portion, an inner blade group provided coaxially with the rotating shaft portion outside the rotating shaft portion, and provided coaxially with the inner blade group outside the inner blade group via an intermediate ring. And an axial fan with an outer blade group.

International Publication No. 2011/001890

The axial fan of Patent Document 1 is provided with an intermediate ring and a large number of blades. For this reason, the weight of the impeller of the axial fan of Patent Document 1 is significantly increased as compared with a normal axial fan. Moreover, since it is necessary to raise the intensity | strength of an impeller according to the increase in weight, the rotating shaft part of the axial fan of patent document 1 is provided with the diameter and thick cylindrical boss | hub. The cylindrical boss is reinforced by a number of reinforcing ribs. By providing such a cylindrical boss, the axial fan of Patent Document 1 has a problem that the weight of the impeller further increases.

Further, in the axial fan of Patent Document 1, since a large-diameter cylindrical boss is provided, a large separation area is generated on the downstream side of the cylindrical boss. For this reason, the subject that the loss of an axial fan will become large occurred.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a blower, an outdoor unit, and a refrigeration cycle apparatus that can reduce the weight of the impeller and reduce the loss.

The blower according to the present invention includes a cylindrical shaft portion provided on a rotation shaft, a ring portion provided on the outer peripheral side of the shaft portion around the rotation shaft, and the radial direction of the ring portion. A plurality of first blades provided outside the ring portion; a plurality of second blades provided between the shaft portion and the ring portion in a radial direction of the ring portion; and adjacent to the shaft portion. A plate-like connecting portion that connects two second blades adjacent in the circumferential direction among the plurality of second blades, or on the blade surface downstream of the plurality of second blades or the connecting portion. And a plurality of third blades that are provided on the downstream surface and connected to the shaft portion.
The outdoor unit according to the present invention includes the blower according to the present invention and a heat exchanger to which air is supplied by the blower.
The refrigeration cycle apparatus according to the present invention includes the outdoor unit according to the present invention.

According to the present invention, the shaft portion and the second blade can be reinforced by the third blade. Therefore, it is possible to reduce the weight of the impeller while maintaining the strength of the shaft portion and the second blade. Further, the third blade not only reinforces the shaft portion and the second blade, but also performs aerodynamic work. Therefore, since the peeling area which generate | occur | produces in the downstream of an axial part can be made small, the loss of a fan can be reduced.

It is a perspective view which shows the structure of the outdoor unit 100 which concerns on Embodiment 1 of this invention. It is a top view for demonstrating the internal structure of the outdoor unit 100 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which removed the fan grille 2 from the outdoor unit 100 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which removed a part of housing | casing 1 from the outdoor unit 100 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure which looked at the air blower 20 which concerns on Embodiment 1 of this invention from the front side (downstream side). It is a front view which shows the structure of the air blower 20 which concerns on Embodiment 1 of this invention. FIG. 7 is a cross-sectional view showing a VII-VII cross section of FIG. 6. FIG. 7 is a cross-sectional view showing a VIII-VIII cross section of FIG. 6. It is a front view which shows the modification of the structure of the air blower 20 which concerns on Embodiment 1 of this invention. It is a front view which shows the modification of the structure of the air blower 20 which concerns on Embodiment 1 of this invention. It is a front view which shows the modification of the structure of the air blower 20 which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure which looked at the outdoor unit provided with the air blower of the comparative example from the downstream. It is a figure for demonstrating the airflow A which arises in the outdoor unit provided with the air blower of the comparative example. It is a figure for demonstrating the airflow A produced in the outdoor unit 100 provided with the air blower 20 which concerns on Embodiment 1 of this invention. It is a front view which shows the structure of the air blower 20 which concerns on Embodiment 2 of this invention. It is a front view which shows the modification of the structure of the air blower 20 which concerns on Embodiment 2 of this invention. It is a circuit diagram which shows the structure of the air conditioning apparatus which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
A blower and an outdoor unit according to Embodiment 1 of the present invention will be described. FIG. 1 is a perspective view showing a configuration of an outdoor unit 100 according to the present embodiment. FIG. 2 is a top view for explaining the internal configuration of outdoor unit 100 according to the present embodiment. FIG. 3 is a perspective view showing a state where the fan grill 2 is removed from the outdoor unit 100 according to the present embodiment. FIG. 4 is a perspective view showing a state where a part of the housing 1 is removed from the outdoor unit 100 according to the present embodiment. In the following drawings including FIG. 1 to FIG. 4, the relative dimensional relationships and shapes of the constituent members may be different from the actual ones.

In this embodiment, an outdoor unit of an air conditioner is illustrated as the outdoor unit 100. The outdoor unit 100 of this Embodiment is applicable also to the outdoor unit of another refrigeration cycle apparatus. For example, an outdoor unit for a water heater has the same configuration as the outdoor unit of the air conditioner exemplified in this embodiment.

As shown in FIGS. 1 to 4, the outdoor unit 100 has a rectangular parallelepiped casing 1. The housing 1 includes a first side surface 1a, a front surface 1b, a second side surface 1c, a back surface 1d, a top surface 1e, and a bottom surface 1f. The first side surface 1a and the back surface 1d are formed with openings for sucking air into the housing 1 from the outside. The front surface 1b is formed with an opening serving as an air outlet 1g for blowing air from the inside of the housing 1 to the outside. The air outlet 1g is covered with a fan grill 2. The fan grill 2 is for safety by preventing contact between an external object and the blower 20.

The interior of the housing 1 is partitioned into a blower chamber 6 and a machine chamber 7 by a partition plate 5. In the blower chamber 6, a blower 20, a bell mouth 9, and a heat exchanger 8 are installed.

The blower 20 includes an impeller 3 and a fan motor 4 that rotationally drives the impeller 3. The impeller 3 is connected to a drive shaft 4 a of the fan motor 4. The rotational driving force of the fan motor 4 is transmitted to the impeller 3 through the drive shaft 4a. The fan motor 4 is disposed between the impeller 3 and the heat exchanger 8 in the front-rear direction of the housing 1. The detailed configuration of the impeller 3 will be described later.

The bell mouth 9 is attached to the front surface 1 b of the housing 1. The bell mouth 9 may be provided integrally with the front surface 1b or may be provided separately from the front surface 1b. The bell mouth 9 divides the suction side and the outlet side to form an air passage in the vicinity of the outlet 1g. The bell mouth 9 is configured to surround the outer periphery of the air outlet 1g. The bell mouth 9 is disposed on the outer side of the outer peripheral end of the first blade 31 described later so as to follow the rotation trajectory of the first blade 31. The fan grill 2 is attached to the front surface 1 b so as to cover the bell mouth 9 from the outside of the housing 1.

The heat exchanger 8 has a substantially L-shaped overall shape when viewed from above. The heat exchanger 8 is installed along the first side surface 1 a and the back surface 1 d of the housing 1. The heat exchanger 8 is disposed on the suction side of the blower 20. The heat exchanger 8 is disposed between each of the first side surface 1 a and the back surface 1 d and the blower 20. The heat exchanger 8 has a plurality of plate-like fins provided in parallel to each other and a plurality of heat transfer tubes penetrating the plurality of plate-like fins. Each heat transfer tube extends in an L shape along the first side surface 1a and the back surface 1d. A refrigerant circulating through the refrigerant circuit flows in the heat transfer tube. In the heat exchanger 8, heat exchange between the refrigerant circulating in the heat transfer tube and the outdoor air supplied by the blower 20 is performed.

The machine room 7 is provided with a compressor 10 that constitutes a refrigerant circuit together with the heat exchanger 8, and refrigerant piping that connects the components of the refrigerant circuit. A substrate box 12 is installed in the machine room 7. A control board for controlling equipment mounted in the outdoor unit 100 is accommodated in the substrate box 12.

Next, the configuration of the blower 20 will be described. FIG. 5 is a perspective view showing a configuration of the blower 20 according to the present embodiment as viewed from the front side (downstream side). FIG. 6 is a front view showing the configuration of the blower 20 according to the present embodiment. 5 and 6, only the impeller 3 of the blower 20 is shown. In FIG. 6, the rotation direction of the blower 20 is indicated by an arrow. As shown in FIGS. 5 and 6, the blower 20 is an axial flow type blower that generates an air flow in a direction along the rotation axis R as a whole. The blower 20 includes a cylindrical shaft portion 30 provided on the rotation shaft R, and a shroud ring 34 (an example of a ring portion) provided on the outer peripheral side with respect to the rotation shaft R around the rotation shaft R. is doing. The shaft portion 30 is a shaft member that rotates about the rotation axis R. The shroud ring 34 has an annular or cylindrical shape. The shroud ring 34 rotates with the shaft portion 30 about the rotation axis R. Moreover, the air blower 20 has the 1st blade | wing 31, the 2nd blade | wing 32, and the 3rd blade | wing 33 as a wing | blade.

The first blade 31 is provided outside the shroud ring 34 in the radial direction of the shroud ring 34. For example, the first blade 31 is integrally connected to the outer peripheral surface of the shroud ring 34. The 1st blade | wing 31 is a blade | wing located in the outermost peripheral side in the air blower 20 of this example. The number of first blades 31 is nine in this example. The plurality of first blades 31 have the same shape, and are arranged at equal intervals in the circumferential direction around the rotation axis R. The plurality of first blades 31 may have different shapes from each other, and the circumferential arrangement intervals may be different. The first blade 31 is a propeller fan type blade that blows air in the direction of the rotation axis R by rotating about the rotation axis R.

The second blade 32 is provided between the shaft portion 30 and the shroud ring 34 in the radial direction of the shroud ring 34. For example, the inner peripheral side of the second blade 32 is integrally connected to the outer peripheral surface of the shaft portion 30. For example, the outer peripheral side of the second blade 32 is integrally connected to the inner peripheral surface of the shroud ring 34. That is, the shaft portion 30 and the shroud ring 34 are connected via the second blade 32. The number of second blades 32 may be the same as or different from the number of first blades 31. The number of second blades 32 in this example is three, which is smaller than the number of first blades 31. The plurality of second blades 32 have the same shape, and are arranged at equal intervals in the circumferential direction around the rotation axis R. The plurality of second blades 32 may have different shapes from each other, and the circumferential arrangement intervals may be different. The second blade 32 is a propeller fan type blade that blows air in the direction of the rotation axis R by rotating about the rotation axis R.

Of the second blades 32, the two second blades 32 adjacent to each other in the circumferential direction are integrally connected by a plate-like connecting portion 36 provided adjacent to the shaft portion 30. The connecting portion 36 connects the inner peripheral sides of the two second blades 32 adjacent in the circumferential direction. The downstream surface of the connecting portion 36 smoothly connects the blade surfaces (pressure surfaces) on the downstream side of the two second blades 32. The upstream surface of the coupling portion 36 smoothly connects the blade surfaces (negative pressure surfaces) on the upstream side of the two second blades 32. The number of connecting portions 36 is four, which is the same as the number of second blades 32.

Integral wings are formed by connecting the plurality of second blades 32 integrally through the connecting portion 36. That is, the plurality of second blades 32 and the plurality of connecting portions 36 constitute a so-called bossless type propeller fan. The shaft portion 30 is formed so as to protrude on the blade surface on the downstream side of the integral blade.

FIG. 7 is a cross-sectional view showing a VII-VII cross section of FIG. FIG. 8 is a cross-sectional view showing a VIII-VIII cross section of FIG. FIG. 7 shows a schematic circumferential cross section of the first portion of the second blade 32 close to the connection portion with the shroud ring 34. FIG. 8 shows a schematic circumferential cross section of a second portion of the second blade 32 that is located on the inner peripheral side of the first portion. When the thickness (maximum blade thickness) in the first portion of the second blade 32 shown in FIG. 7 is t1, and the thickness (maximum blade thickness) in the second portion of the second blade 32 shown in FIG. The thickness t1 is larger than the wall thickness t2 (t1> t2). The thickness of the second blade 32 is, for example, thicker toward the outer peripheral side (the shroud ring 34 side) and thinner toward the inner peripheral side (the shaft portion 30 side).

The third blade 33 has a configuration protruding in a rib shape on the blade surface on the downstream side of the integral blade (that is, on the blade surface on the downstream side of the second blade 32 or on the downstream surface of the connecting portion 36). is doing. The third blade 33 is formed integrally with the second blade 32 and the connecting portion 36. The third blade 33 is integrally connected to the outer peripheral surface of the shaft portion 30. The number of third blades 33 may be the same as or different from the number of first blades 31 and the number of second blades 32. The number of third blades 33 in this example is six, which is smaller than the number of first blades 31 and larger than the number of second blades 32. The plurality of third blades 33 have the same shape, and are arranged at equal intervals in the circumferential direction around the rotation axis R. The plurality of third blades 33 may have different shapes from each other, and the circumferential arrangement intervals may be different. The third blade 33 has, for example, a centrifugal blade shape. That is, the blade surface (pressure surface and suction surface) of the third blade 33 is parallel to the rotation axis R. The third blade 33 of this example has a sirocco blade shape that is curved so as to protrude toward the counter-rotating direction of the blower 20. The third blade 33 extends from the shaft portion 30 to the outer peripheral side of the connecting portion 36 along the blade surface on the downstream side of the second blade 32. The height of the third blade 33 (that is, the dimension of the third blade 33 in the direction of the rotation axis R) decreases as the distance from the shaft portion 30 increases.

The shaft part 30, the third blade 33 and the connecting part 36 constitute a hub of the blower 20. The third blade 33 not only performs aerodynamic work as a centrifugal blade, but also has a function of reinforcing the shaft portion 30 and the second blade 32 together with the connecting portion 36.

9 to 11 are front views showing modified examples of the configuration of the blower 20 according to the present embodiment. The blower 20 according to the present embodiment may have a configuration as shown in each of FIGS.

In the example shown in FIG. 9, the third blade 33 has a turbo blade shape curved so as to protrude toward the rotation direction of the blower 20. The point that the third blade 33 has a centrifugal blade shape is the same as the configuration shown in FIGS.

In the example shown in FIG. 10, a shroud ring 37 is provided on the outer peripheral side of the first blade 31 in addition to the configuration shown in FIG. 9. The shroud ring 37 is provided on the outer peripheral side of the shroud ring 34 around the rotation axis R. The first blade 31 is connected to the inner peripheral surface of the shroud ring 37. Similar to the relation between the thicknesses t1 and t2 of the second blade 32 already described, the thickness (maximum blade thickness) t1 of the first portion of the first blade 31 is larger than that of the first portion of the first blade 31. It is larger than the wall thickness (maximum blade thickness) t2 in the second portion located on the inner peripheral side.

In the example shown in FIG. 11, in addition to the configuration shown in FIG. 10, a plurality of fourth blades 38 are provided outside the shroud ring 37 in the radial direction. The fourth blade 38 is connected to the outer peripheral surface of the shroud ring 37. The fourth blade 38 is a propeller fan type blade. The number of the fourth blades 38 may be the same as or different from the number of the first blades 31.

Next, the operation of the outdoor unit 100 according to the present embodiment will be described with reference to FIG. When the blower 20 operates in the outdoor unit 100, outdoor air outside the housing 1 is sucked into the housing 1. The air sucked into the housing 1 passes through the heat exchanger 8. Thereby, in the heat exchanger 8, heat exchange between the air passing through the heat exchanger 8 and the refrigerant flowing through the heat transfer pipe of the heat exchanger 8 is performed. The air that has undergone heat exchange with the refrigerant passes through the blower 20 and the bell mouth 9, and is blown out from the outlet 1g. As described above, when the blower 20 operates, the outdoor unit 100 generates an airflow A as indicated by an arrow in FIG.

Next, the airflow A generated by the blower 20 of the present embodiment will be described in comparison with a comparative example. FIG. 12 is a perspective view showing a configuration of an outdoor unit provided with a blower of a comparative example as viewed from the downstream side. The blower of the comparative example shown in FIG. 12 is different from the blower 20 according to the present embodiment in the following points. That is, in the blower of the comparative example, at least the boss 39 having a diameter larger than that of the shaft portion 30 is provided on the rotating shaft instead of the shaft portion 30, the connecting portion 36, and the third blade 33 of the present embodiment. Moreover, in the air blower of a comparative example, the thickness of the 2nd blade | wing 32 is uniform in radial direction, and thickness distribution like the 2nd blade | wing 32 of this Embodiment is not formed.

As shown in FIG. 12, the blower of the comparative example has a boss 39, a second blade 32, a shroud ring 34, and a first blade 31. The inner peripheral side of the second blade 32 is connected to the outer peripheral surface of the boss 39 at a right angle. The outer peripheral side of the second blade 32 is connected to the shroud ring 34. The first blade 31 is connected to the shroud ring 34.

FIG. 13 is a diagram for explaining the airflow A generated in the outdoor unit equipped with the blower of the comparative example. As shown in FIG. 13, in the blower of the comparative example, the boss 39 has a large diameter cylindrical shape. For this reason, the airflow A generated by the rotation of the second blade 32 flows along the outer peripheral surface of the boss 39 and then peels off at the distal end portion on the downstream side of the boss 39. As a result, a relatively large peeling area 40 is generated on the downstream side of the boss 39.

FIG. 14 is a diagram for explaining the airflow A generated in the outdoor unit 100 including the blower 20 according to the present embodiment. As shown in FIG. 14, in the blower 20 according to the present embodiment, the plurality of second blades 32 form an integral blade, and the shaft portion 30 is connected to the blade surface on the downstream side of the integral blade. A third blade 33 is formed. For this reason, air current can be generated by the third blade 33 even in the vicinity of the shaft portion 30 on the inner peripheral side of the second blade 32. In addition, since the shaft portion 30 is reinforced by the third blade 33, the shaft portion 30 can be reduced in diameter. Therefore, the peeling area 40 generated on the downstream side of the shaft portion 30 can be reduced.

As described above, the blower 20 according to the present embodiment includes the cylindrical shaft portion 30 provided on the rotation shaft R, and the shroud provided on the outer peripheral side with respect to the rotation portion R around the rotation shaft R. A ring 34 (an example of a ring portion), a plurality of first blades 31 provided outside the shroud ring 34 in the radial direction of the shroud ring 34, a shaft portion 30 and a shroud ring 34 in the radial direction of the shroud ring 34, A plurality of second blades 32 provided between and a plate-like member provided adjacent to the shaft portion 30 and connecting two second blades 32 adjacent to each other in the circumferential direction among the plurality of second blades 32. A connecting portion 36 and a plurality of third blades 33 provided on the downstream blade surface of the plurality of second blades 32 or on the downstream surface of the connecting portion 36 and connected to the shaft portion 30. It is.

According to this configuration, the shaft portion 30 and the second blade 32 can be reinforced by the third blade 33. For this reason, while maintaining the strength of the shaft portion 30 and the second blade 32, the shaft portion 30 can be reduced in diameter and thickness, and the second blade 32 can be thinned. Therefore, the impeller 3 of the blower 20 can be reduced in weight. Thereby, size reduction of the fan motor 4, long life of the fan motor 4, and manufacturing cost reduction of the blower 20 can be realized together.

Further, the third blade 33 not only reinforces the shaft portion 30 and the second blade 32 but also performs aerodynamic work. For this reason, the third blade 33 can also generate an air current around the shaft portion 30. Therefore, the peeling area 40 generated on the downstream side of the shaft portion 30 can be reduced, and the generation of vortices on the downstream side of the shaft portion 30 can be suppressed. Thereby, the loss of the pressure flow characteristic due to the generation of vortices can be reduced, and the noise due to the generation of vortices can be reduced.

Further, in the blower 20 according to the present embodiment, each of the plurality of second blades 32 has a first portion (for example, a portion close to a connection portion with the shroud ring 34 illustrated in FIG. 7) and the first portion. And a second portion (for example, a portion shown in FIG. 8) located on the inner peripheral side. The thickness at the first portion (for example, the maximum blade thickness in the circumferential section of the first portion) is t1, and the thickness at the second portion (for example, the maximum blade thickness in the circumferential section of the second portion) is t2. , The thickness t1 and the thickness t2 satisfy the relationship of t1> t2.

According to this configuration, the thickness of the outer peripheral side portion of the second blade 32 can be increased without increasing the weight of the second blade 32 as a whole. Therefore, the strength of the connection portion between the second blade 32 and the shroud ring 34 can be increased. On the other hand, in the inner peripheral side portion of the second blade 32 reinforced by the third blade 33, sufficient strength can be obtained even if the wall thickness is reduced. Therefore, according to said structure, the air blower 20 which can fully maintain intensity | strength even at high rotational speed is realizable.

Further, in the blower 20 according to the present embodiment, each of the plurality of third blades 33 has a centrifugal blade shape. According to this configuration, an air flow can be generated in the vicinity of the shaft portion 30. Moreover, according to this structure, since the blade surface of the 3rd blade | wing 33 is parallel to the rotating shaft R, it can prevent that an undercut part arises. Therefore, the impeller 3 using the mold can be easily formed.

Moreover, the outdoor unit 100 according to the present embodiment includes the blower 20 according to the present embodiment and the heat exchanger 8 to which air is supplied by the blower 20. According to this configuration, the same effect as described above can be obtained in the outdoor unit 100.

Embodiment 2. FIG.
A blower according to Embodiment 2 of the present invention will be described. FIG. 15 is a front view showing the configuration of the blower 20 according to the present embodiment. The blower 20 according to the present embodiment is different from the blower 20 of the first embodiment in the configuration of the third blade 33.

As shown in FIG. 15, the third blade 33 is provided on the blade surface on the downstream side of the second blade 32 or on the downstream surface of the connecting portion 36. The third blade 33 has a centrifugal blade shape having a blade surface with an arcuate cross section. In this example, the end portions of the three third blades 33 are connected to each other, and are arranged in a substantially triangular shape surrounding the shaft portion 30 as a whole. Each blade surface of the third blade 33 is convex toward the rotation axis R side. Each of the third blades 33 is integrally connected to the outer peripheral surface of the shaft portion 30.

FIG. 16 is a front view showing a modification of the configuration of the blower 20 according to the present embodiment. In the modification shown in FIG. 16, the blade surfaces of the three third blades 33 are convex on the outer peripheral side. Each of the 3rd blade | wing 33 is integrally connected to the outer peripheral surface of the axial part 30 via the rib not shown.

According to the blower 20 according to the present embodiment, the same effect as the blower 20 according to the first embodiment can be obtained. Moreover, in this Embodiment, each of the 3rd blade | wing 33 is not only connected to the axial part 30, but the edge parts of the 3rd blade | wing 33 are mutually connected. Accordingly, the reinforcing effect of the shaft portion 30 and the second blade 32 by the third blade 33 can be further enhanced.

In the present embodiment, the three third blades 33 are disposed in a substantially triangular shape surrounding the shaft portion 30, but four or more third blades are disposed in a polygonal shape surrounding the shaft portion 30. May be.

Embodiment 3 FIG.
A refrigeration cycle apparatus according to Embodiment 3 of the present invention will be described. In the present embodiment, an air conditioner is exemplified as the refrigeration cycle apparatus. The air conditioning apparatus according to the present embodiment includes, for example, the outdoor unit 100 according to Embodiment 1. FIG. 17 is a circuit diagram showing a configuration of the air-conditioning apparatus according to the present embodiment.

As shown in FIG. 17, the air conditioner has a refrigerant circuit for circulating the refrigerant. The refrigerant circuit has a configuration in which a compressor 101, a four-way valve 102, an outdoor heat exchanger 103, an expansion device 105 (for example, an expansion valve), and an indoor heat exchanger 201 are connected by a refrigerant pipe. In addition, the air conditioner includes an outdoor unit 100 and an indoor unit 200. The outdoor unit 100 and the indoor unit 200 are connected via a gas pipe 300 and a liquid pipe 400. The gas pipe 300 constitutes a part of the refrigerant pipe and distributes the gas refrigerant. The liquid pipe 400 constitutes a part of the refrigerant pipe and circulates the liquid refrigerant or the gas-liquid two-phase refrigerant.

The outdoor unit 100 in the present embodiment accommodates a compressor 101, a four-way valve 102, an outdoor heat exchanger 103, an expansion device 105, and an outdoor fan 104 that supplies air to the outdoor heat exchanger 103. . As the outdoor heat exchanger 103, the heat exchanger 8 in Embodiment 1 is used. As the outdoor blower 104, the blower 20 in the first or second embodiment is used.

Compressor 101 compresses and discharges the sucked refrigerant. Here, the compressor 101 includes an inverter device or the like, and can arbitrarily change the capacity of the compressor 101 (the amount of refrigerant sent out per unit time) by arbitrarily changing the operation frequency. The four-way valve 102 switches the refrigerant flow between the cooling operation and the heating operation based on an instruction from a control device (not shown).

The outdoor heat exchanger 103 performs heat exchange between the refrigerant and air (for example, outdoor air). During the heating operation, the outdoor heat exchanger 103 functions as an evaporator. That is, the outdoor heat exchanger 103 performs heat exchange between the low-pressure two-phase refrigerant flowing from the liquid pipe 400 and the air supplied by the outdoor blower 104, and evaporates the refrigerant. On the other hand, during the cooling operation, the outdoor heat exchanger 103 functions as a condenser. That is, the outdoor heat exchanger 103 performs heat exchange between the high-pressure gas refrigerant compressed by the compressor 101 and the air supplied by the outdoor blower 104 to condense the refrigerant. The outdoor blower 104 may include an inverter device, and may change the rotation speed finely by arbitrarily changing the operation frequency. The expansion device 105 adjusts the refrigerant pressure and the like by changing the opening.

The indoor unit 200 contains an indoor heat exchanger 201 and an indoor blower 202 that supplies air to the indoor heat exchanger 201.

The indoor heat exchanger 201 performs heat exchange between the refrigerant and air (for example, indoor air). During the heating operation, the indoor heat exchanger 201 functions as a condenser. That is, the indoor heat exchanger 201 performs heat exchange between the high-pressure gas refrigerant flowing in from the gas pipe 300 and the air supplied from the indoor blower 202, and condenses the refrigerant as a liquid refrigerant or a gas-liquid two-phase refrigerant. The liquid pipe 400 is caused to flow out. The air that has passed through the indoor heat exchanger 201 is heated by heat exchange with the refrigerant. On the other hand, during the cooling operation, the indoor heat exchanger 201 functions as an evaporator. That is, the indoor heat exchanger 201 exchanges heat between the low-pressure two-phase refrigerant that has been decompressed by the expansion device 105 and flows from the liquid pipe 400 and the air supplied by the indoor blower 202, and evaporates the refrigerant to provide gas. The refrigerant flows out to the gas pipe 300 side. The air that has passed through the indoor heat exchanger 201 is cooled by heat exchange with the refrigerant.

The rotation speed of the indoor blower 202 is determined by, for example, user settings. Although it does not specifically limit, the air blower 20 in Embodiment 1 or 2 can be used also for the indoor air blower 202. FIG.

As described above, the air-conditioning apparatus (an example of a refrigeration cycle apparatus) according to the present embodiment includes the outdoor unit 100 according to the first embodiment. According to this configuration, the same effect as in the first embodiment can be obtained in the air conditioner.

The above Embodiments 1 to 3 can be implemented in combination with each other.

Examples of utilization of the present invention include outdoor units constituting the refrigeration cycle apparatus, for example, outdoor units such as an air conditioner and a water heater, and various devices and facilities in which a blower is installed. The present invention can be widely used for various devices and equipment in which these fans are installed.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 housing, 1a first side, 1b front, 1c second side, 1d back, 1e top, 1f bottom, 1g outlet, 2 fan grill, 3 impeller, 4 fan motor, 4a drive shaft, 5 partition plate, 6 blower room, 7 machine room, 8 heat exchanger, 9 bellmouth, 10 compressor, 12 substrate box, 20 blower, 30 shaft, 31 first blade, 32 second blade, 33 third blade, 34 shroud ring , 36 connecting part, 37 shroud ring, 38 4th blade, 39 boss, 40 peeling zone, 100 outdoor unit, 101 compressor, 102 four-way valve, 103 outdoor heat exchanger, 104 outdoor blower, 105 throttle device, 200 indoor unit , 201 indoor heat exchanger, 202 indoor blower, 300 gas piping, 400 liquid piping, A airflow, R rotating shaft.

Claims (5)

1. A cylindrical shaft provided on the rotary shaft;
   A ring portion provided on the outer peripheral side with respect to the shaft portion around the rotation shaft;
   A plurality of first blades provided outside the ring portion in the radial direction of the ring portion;
   A plurality of second blades provided between the shaft portion and the ring portion in the radial direction of the ring portion;
   A plate-like connecting portion that is provided adjacent to the shaft portion and connects two second blades adjacent in the circumferential direction among the plurality of second blades;
   A plurality of third blades provided on the downstream blade surface of the plurality of second blades or on the downstream surface of the connecting portion and connected to the shaft portion;
   With blower.
2. Each of the plurality of second blades includes a first portion and a second portion located on the inner peripheral side of the first portion,
   When the thickness at the first portion is t1, and the thickness at the second portion is t2,
   The blower according to claim 1, wherein the wall thickness t1 and the wall thickness t2 satisfy a relationship of t1> t2.
3. The blower according to claim 1 or 2, wherein each of the plurality of third blades has a centrifugal blade shape.
4. An outdoor unit comprising the blower according to any one of claims 1 to 3 and a heat exchanger to which air is supplied by the blower.
5. A refrigeration cycle apparatus comprising the outdoor unit according to claim 4.

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