EP4425060A1

EP4425060A1 - Outdoor unit of refrigeration cycle device

Info

Publication number: EP4425060A1
Application number: EP21962318.8A
Authority: EP
Inventors: Takuya Teramoto; Hiroyasu Hayashi; Ryoji Abe; Kohei Kasai; Koji Yamaguchi; Kazuya Okada
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2024-09-04
Also published as: JP7613606B2; JPWO2023073768A1; TWI840912B; EP4425060A4; US20240392979A1; TW202317922A; CN118103637A; WO2023073768A1

Abstract

There is provided an outdoor unit of refrigeration cycle apparatus that can obtain a large airflow volume even when an external static pressure is high, while preventing an increase in size of the outdoor unit. For this object, the outdoor unit includes a housing (1) in which a machine chamber (2) and a blower chamber (3) are formed, the blower chamber (3) housing a heat exchanger (4) and a blower (100) inside. The blower (100) is a double inlet centrifugal blower including: an impeller (200); and a scroll casing (110) having suction ports and a discharge port (112), the scroll casing (110) housing the impeller (200) inside. A plurality of discharge ports (112) are provided. The plurality of discharge ports (112) are located on an outlet placement surface of the housing (1). A total width of the plurality of discharge ports (112) in a direction horizontal with the housing (1) placed and parallel to the outlet placement surface is more than a width of the blower chamber (3) in said direction.

Description

Technical Field

The present disclosure relates to an outdoor unit of refrigeration cycle apparatus.

Background Art

An outside unit of air conditioner, in which an air heat exchanger and a blower are provided, has been known as using a centrifugal blower (sirocco fan) as the blower, and providing air inlets on at least a back side of a housing, while providing air outlets on any of a right side, a left side, or a top side of the housing, or on both the left and right sides of the housing (see, for example, PTL 1).

Citation List

Patent Literature

[PTL 1] JP H07-027369 A

Summary of the Invention

Problems to be Solved by the Invention

However, in the outdoor unit of refrigeration cycle apparatus as disclosed in PTL 1, the size of air outlets of the centrifugal blower tends to be comparatively small relative to the size of the housing of the outdoor unit, particularly, the size of the air heat exchanger. This results in a reduction in airflow volume compared to a conventional outdoor unit of the same size and having a propeller fan installed therein. It is thus difficult to obtain a sufficient airflow volume particularly when a static pressure external to the outdoor unit is high. In addition, the airflow volume is reduced, which makes it difficult to achieve sufficient pressure recovery. This leads to an increase in noise level and an increase in input.
The present disclosure has been made to solve such problems. It is an object of the present disclosure to provide an outdoor unit of refrigeration cycle apparatus, in which even when a static pressure external to the outdoor unit is high, the outdoor unit can still obtain a large airflow volume, and can therefore achieve a low noise level and a low input, while preventing an increase in size of the outdoor unit.

Solution to Problem

An outdoor unit of refrigeration cycle apparatus according to the present disclosure includes a housing in which a machine chamber and a blower chamber are formed, the blower chamber being partitioned from the machine chamber, the machine chamber housing a compressor inside, the blower chamber housing a heat exchanger and a blower inside, the blower being located on a secondary side of the heat exchanger, wherein the blower is a double inlet centrifugal blower including: an impeller having a plurality of blades arranged in a circumferential direction around a rotation axis, and a scroll casing having a discharge port and two bellmouths which serve as suction ports, the scroll casing housing the impeller inside, a plurality of the discharge ports are provided, the plurality of the discharge ports are located on an outlet placement surface, the outlet placement surface being a front or top surface of the housing, and a total width of the plurality of the discharge ports in a direction horizontal with the housing placed and parallel to the outlet placement surface is more than a width of the blower chamber in said direction.

Advantageous Effects of the Invention

The outdoor unit of refrigeration cycle apparatus according to the present disclosure achieves such effects that even when a static pressure external to the outdoor unit is high, the outdoor unit can still obtain a large airflow volume, and can therefore achieve a low noise level and a low input, while preventing an increase in size of the outdoor unit.

Brief Description of the Drawings

Fig. 1 is a front view of an outdoor unit of refrigeration cycle apparatus according to First Embodiment with a front panel removed from the outdoor unit.
Fig. 2 is a transparent top view illustrating relevant parts of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 3 is a transparent side view illustrating the relevant parts of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 4 is a front view of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 5 is a front view of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 6 is a plan view of an impeller of a blower included in the outdoor unit according to First Embodiment.
Fig. 7 is a cross-sectional view of the blower included in the outdoor unit according to First Embodiment.
Fig. 8 is a plan view of the impeller of the blower included in the outdoor unit according to First Embodiment.
Fig. 9 is a cross-sectional view of the impeller of the blower included in the outdoor unit according to First Embodiment.
Fig. 10 is a perspective view of the impeller of the blower included in the outdoor unit according to First Embodiment.
Fig. 11 is a transparent top view of relevant parts, illustrating another example of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 12 is a top view illustrating still another example of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 13 is a top view illustrating still another example of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 14 is a top view illustrating still another example of the outdoor unit of refrigeration cycle apparatus according to First Embodiment with a top panel removed from the outdoor unit.
Fig. 15 is a transparent front view of relevant parts, illustrating still another example of the outdoor unit of refrigeration cycle apparatus according to First Embodiment.
Fig. 16 is a front view of an outdoor unit of refrigeration cycle apparatus according to Second Embodiment with a front panel removed from the outdoor unit.
Fig. 17 is a cross-sectional view of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 18 is a front view of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 19 is a front view of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 20 is a front view illustrating a modification of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment with the front panel removed from the outdoor unit.
Fig. 21 is a front view illustrating a first other example of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment with the front panel removed from the outdoor unit.
Fig. 22 is a front view illustrating a second other example of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment with the front panel removed from the outdoor unit.
Fig. 23 is a cross-sectional view illustrating the second other example of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 24 is a front view illustrating the second other example of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 25 is a front view illustrating the second other example of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 26 is a front view illustrating a modification of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment with the front panel removed from the outdoor unit.
Fig. 27 is a front view illustrating the modification of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 28 is a perspective view of a blower included in the modification of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.
Fig. 29 is a cross-sectional view of the blower included in the modification of the outdoor unit of refrigeration cycle apparatus according to Second Embodiment.

Description of Embodiments

Embodiments of an outdoor unit of refrigeration cycle apparatus according to the present disclosure will be described below with reference to the accompanying drawings. Note that the same or equivalent components in the drawings are denoted by the same reference signs, and overlapping descriptions thereof are thus simplified or omitted as appropriate. In the descriptions below, for the sake of convenience, the positional relationship between structures may be expressed based on the state illustrated in the drawings. Note that the present disclosure is not limited to the embodiments described below, and it is possible to freely combine the embodiments, modify any constituent element in each embodiment, or omit any constituent element in each embodiment without departing from the scope of the present disclosure.

First Embodiment

A first embodiment of the present disclosure is described below with reference to Figs. 1 to 15.
Fig. 1 is a front view of an outdoor unit of refrigeration cycle apparatus with a front panel removed from the outdoor unit. Fig. 2 is a transparent top view illustrating relevant parts of the outdoor unit of refrigeration cycle apparatus. Fig. 3 is a transparent side view illustrating the relevant parts of the outdoor unit of refrigeration cycle apparatus. Figs. 4 and 5 are front views of the outdoor unit of refrigeration cycle apparatus. Fig. 6 is a plan view of an impeller of a blower included in the outdoor unit. Fig. 7 is a cross-sectional view of the blower included in the outdoor unit. Fig. 8 is a plan view of the impeller of the blower included in the outdoor unit. Fig. 9 is a cross-sectional view of the impeller of the blower included in the outdoor unit. Fig. 10 is a perspective view of the impeller of the blower included in the outdoor unit. Fig. 11 is a transparent top view of relevant parts, illustrating another example of the outdoor unit of refrigeration cycle apparatus. Figs. 12 and 13 are top views illustrating still another example of the outdoor unit of refrigeration cycle apparatus. Fig. 14 is a top view illustrating still another example of the outdoor unit of refrigeration cycle apparatus with a top panel removed from the outdoor unit. Fig. 15 is a transparent front view of relevant parts, illustrating still another example of the outdoor unit of refrigeration cycle apparatus.
A refrigeration cycle apparatus according to the present embodiment includes an indoor unit and an outdoor unit. In each of the indoor unit and the outdoor unit, a heat exchanger is provided. The heat exchanger in the indoor unit, and the heat exchanger in the outdoor unit are connected by a refrigerant pipe provided to allow for circulation of refrigerant. The refrigeration cycle apparatus serves as a heat pump that causes refrigerant flowing through the refrigerant pipe to circulate between the heat exchanger in the indoor unit and the heat exchanger in the outdoor unit, thereby to transfer heat between the heat exchanger in the indoor unit and the heat exchanger in the outdoor unit.
As illustrated in Figs. 1 to 5, the outdoor unit of refrigeration cycle apparatus according to the present embodiment includes a housing 1. The housing 1 has, for example, a cuboid outer shape. That is, in the illustrated configuration, the housing 1 has a front surface, a back surface, a top surface, a bottom surface, and opposite left and right lateral surfaces.
In the housing 1, a machine chamber 2 and a blower chamber 3 are formed. The machine chamber 2 is located on one of the left and right sides of the housing 1. The blower chamber 3 is located on the other of the left and right sides of the housing 1. The machine chamber 2 and the blower chamber 3 are partitioned from each other. The machine chamber 2 houses a compressor, an electrical component box, and the like (not illustrated) inside. The blower chamber 3 houses a heat exchanger 4 and blowers 100 inside.
As illustrated in Fig. 2, outdoor-unit air inlets 5 are formed on the lateral surface and back surface of a portion of the housing 1 where the blower chamber 3 is located. As illustrated in Figs. 4 and 5, a front panel 10 is provided on the front surface of a portion of the housing 1 where the blower chamber 3 is located. On the front panel 10, outdoor-unit air outlets 11 are formed. The interior of the blower chamber 3 serves as an air passage extending from the outdoor-unit air inlets 5 to the outdoor-unit air outlets 11. Note that as illustrated in Fig. 5, the outdoor-unit air outlets 11 may be provided with grid-like grilles 12. In this case, the grilles 12 may be attached to the front panel 10, or may be provided integrally with the front panel 10.
Inside the blower chamber 3, the heat exchanger 4 is located in an L-shape in top view, extending from the lateral surface to the back surface of the housing 1 on which the outdoor-unit air inlets 5 are provided. The blowers 100 are located downstream of the heat exchanger 4 in the air passage in the blower chamber 3. In other words, the blowers 100 are located on the secondary side of the heat exchanger 4.
As illustrated in Figs. 1, and 3 to 5, three blowers 100 are provided in the blower chamber 3 in a configuration example described here. In this configuration example, the three blowers 100 are arranged one above the other in an up-down direction. Each of the blowers 100 is a so-called double inlet centrifugal blower. The blower 100 includes an impeller 200, a scroll casing 110, a motor 101, and a shaft 102.
The impeller 200 is a centrifugal fan configured to generate airflow in the blower 100. As illustrated in Fig. 2 and other drawings, the impeller 200 is housed inside the scroll casing 110. The impeller 200 is rotatable about a rotation axis inside the scroll casing 110. As illustrated in Fig. 6, the impeller 200 has a plurality of blades 210. The plurality of blades 210 of the impeller 200 are arranged in a circumferential direction around the rotation axis of the impeller 200.
The scroll casing 110 regulates a flow of air blown out from the impeller 200. The scroll casing 110 has two side walls and a peripheral wall. The side walls of the scroll casing 110 are provided on opposite sides of the impeller 200 in a direction along the rotation axis of the impeller 200. The peripheral wall of the scroll casing 110 is provided so as to surround the impeller 200 from the radially outer side of the impeller 200. The two side walls are located opposite to each other through the peripheral wall.
As illustrated in Fig. 7, two bellmouths 111 are formed on the scroll casing 110. The two bellmouths 111 on the scroll casing 110 serve as suction ports for the blower 100. The bellmouths 111 are provided respectively on the two side walls of the scroll casing 110. The suction ports formed in the bellmouths 111 have a circular shape centered at the rotation axis of the impeller 200. Note that the suction ports are not limited to having a circular shape, but may have other shapes such as an elliptical shape. The bellmouth 111 regulates a flow of gas to be suctioned into the impeller 200 and causes the regulated flow of gas to flow into the suction port of the impeller 200. The bellmouth 111 is formed in such a manner that its opening diameter gradually decreases from the outer part of the scroll casing 110 toward the inner part thereof. This allows air in the vicinity of the suction port to flow smoothly along the bellmouth 111 and flow efficiently into the impeller 200 from the suction port.
On the scroll casing 110, a discharge port 112 is formed. The discharge port 112 is an opening through which airflow generated in the scroll casing 110 by the impeller 200 is discharged. The opening of the discharge port 112 has, for example, a rectangular shape. However, the opening of the discharge port 112 is not limited to having a rectangular shape. The plane of the opening of the discharge port 112 is positioned parallel to the rotation axis of the impeller 200.
The peripheral wall of the scroll casing 110 guides the airflow generated by the impeller 200 along its curved wall surface to the discharge port 112. The peripheral wall is provided between the side walls opposite to each other. For example, the peripheral wall is located parallel to the direction along the rotation axis of the impeller 200. Note that the peripheral wall may be inclined relative to the direction along the rotation axis of the impeller 200, and is not limited to the configuration in which the peripheral wall is located parallel to the direction along the rotation axis.
The peripheral wall of the scroll casing 110 is formed into a curved surface having an involute shape when viewed from a direction parallel to the rotation axis of the impeller 200. The involute shape is formed based on, for example, a logarithmic spiral, an Archimedean spiral, or an involute curve. Due to this shape, the air delivered from the impeller 200 smoothly flows through the gap between the impeller 200 and the peripheral wall in the direction toward the discharge port 112. This allows the static pressure of air in the scroll casing 110 to efficiently increase more toward the discharge port 112.
In the descriptions below, the "rotation axis of the impeller 200" may also be referred to as "rotation axis of the blower 100." The blower 100 having the configuration as described above is a double inlet centrifugal blower configured to suction air from opposite end sides of the rotation axis of the blower 100 and to blow out the air in a direction perpendicular to the rotation axis of the blower 100.
The motor 101 and the shaft 102 are shared between the blowers 100. That is, in the configuration example described here, one motor 101 and one shaft 102 are provided for the three blowers 100. The motor 101 is located outside the scroll casings 110 of the blowers 100. In the example illustrated in Fig. 3, the motor 101 is located further above the three blowers 100 arranged vertically one above the other. The shaft 102 transmits the rotational driving force of the motor 101 to the impellers 200 of the blowers 100. The blowers 100 are located in such a manner that the respective rotation axes of the impellers 200 of the blowers 100 are aligned. The shaft 102 is provided along the respective rotation axes of the impellers 200 of the blowers 100. The center of the impeller 200 of each of the blowers 100 is fixed to the shaft 102.
In the outdoor unit according to the present embodiment, a plurality of discharge ports is provided. In the example described here, three blowers 100 are provided, each of which has one discharge port 112. Accordingly, the outdoor unit has a total of three discharge ports 112 in its entirety. The number of the discharge ports 112 to be included in the outdoor unit is not limited to three. It is sufficient that the outdoor unit has two or more discharge ports 112.
As described above, the outdoor-unit air outlets 11 are formed on the front panel 10 provided on the front surface of the housing 1. Corresponding to the discharge ports 112, the outdoor-unit air outlets 11 are provided equal to the number of the discharge ports 112. That is, in the configuration example described here, three outdoor-unit air outlets 11 are formed on the front panel 10. The position and size of the outdoor-unit air outlets 11 are adjusted to match the position and size of their corresponding discharge ports 112. That is, when the front panel 10 is properly attached to the housing 1, the discharge ports 112 are located in their corresponding outdoor-unit air outlets 11.
In this manner, the plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets 11 on the front panel 10. In the outdoor unit according to the present embodiment, the front surface of the housing, on which the front panel 10 is provided, is an outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, the suction ports of each of the blowers 100 are located facing the directions toward the top surface and the bottom surface of the housing 1. That is, the rotation axis of the blower 100 is positioned along the up-down direction.
In the outdoor unit according to the present embodiment, a total width of the plurality of discharge ports 112 is adjusted to be greater than a width of the blower chamber 3. The width of the discharge port 112 and the width of the blower chamber 3 described herein refer to a width in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface described above. That is, a total width of the discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. Note that as described above, since the rotation axis of the blower 100 is positioned along the up-down direction, the direction horizontal with the housing 1 placed can be rephrased as a direction perpendicular to the rotation axis of the blower 100. Therefore, as for the width of the discharge port 112 and the width of the blower chamber 3, in other words, the total width of the discharge ports 112 in the direction perpendicular to the rotation axis of the blower 100 and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction.
In the configuration example described here, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface is a left-right direction. That is, a dimension A illustrated in Fig. 2 is the width of the discharge port 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface. A dimension B illustrated in Fig. 2 is the width of the blower chamber 3 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface. Likewise, each of dimensions A1, A2, and A3 illustrated in Fig. 1 is the width of the discharge port 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface. The dimension B illustrated in Fig. 1 is the width of the blower chamber 3 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface. A total width of the plurality of discharge ports 112 is adjusted to be greater than the width of the blower chamber 3. That is, the relationship between the dimensions A1, A2, A3, and B expressed by the following expression (1) is satisfied. $A 1 + A 2 + A 3 > B$
The outdoor unit of refrigeration cycle apparatus according to the present embodiment, which has the configuration as described above, can still obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and can therefore achieve a low noise level and a low input without increasing the size of the outdoor unit.
Note that in this configuration example, the rotation axis of the blower 100 is positioned along the up-down direction. That is, the rotation axis of the impeller 200 is positioned parallel to the outlet placement surface described above. In this case, it is preferable for the impeller 200 to have a fan diameter larger than a half of a width of the blower chamber 3 in a direction perpendicular to the outlet placement surface, that is, in a front-rear direction. Having the fan diameter as described above can further increase the airflow volume, and consequently makes it possible to achieve an even lower noise level and an even lower input.
Next, an example of the configuration of the blowers 100 included in the outdoor unit according to the present embodiment is described with reference to Figs. 8 to 10. As described above, the blowers 100 are double inlet centrifugal blowers. Each of the blowers 100 includes the impeller 200 that is a centrifugal fan. The impeller 200 includes a main plate portion 201, side plate portions 203, and a plurality of blades 210.
The main plate portion 201 is a disk-shaped member. At the central part of the main plate portion 201, a boss portion 202 is provided. At the center of the boss portion 202, a hole is formed through which the shaft 102 passes. At a circumferential edge part of the main plate portion 201, the plurality of blades 210 are arranged radially in the circumferential direction of the main plate portion 201. The blades 210 are provided on opposite plate surfaces of the main plate portion 201.
Each of the blades 210 is connected at one end to the main plate portion 201, while being connected at the other end to the side plate portion 203. That is, each of the plurality of blades 210 is located between the main plate portion 201 and the side plate portion 203. The plurality of blades 210 are spaced apart from each other at regular intervals in the circumferential direction of the main plate portion 201.
The side plate portions 203 are annular members. Each of the side plate portions 203 is fixed to outer circumferential-side end portions of the plurality of blades 210 on the side opposite to the main plate portion 201. The side plate portions 203 are provided on opposite sides with respect to the plate surface of the main plate portion 201. The side plate portion 203 connects the plurality of blades 210, thereby to maintain the positional relationship between the tip ends of the blades 210 and reinforce the plurality of blades 210.
The impeller 200 is rotationally driven about the rotation axis by driving of the motor 101. As the impeller 200 rotates, gas external to the blower 100 is suctioned from the suction ports formed in the bellmouths of the scroll casing 110. As the impeller 200 rotates, the air suctioned into the space surrounded by the main plate portion 201 and the plurality of blades 210 passes through the spaces between the adjacent blades 210, and is delivered outward in the radial direction of the impeller 200.
Each of the plurality of blades 210 of the impeller 200 has a turbo blade portion 211 and a sirocco blade portion 212. The turbo blade portion 211 is provided on the inner circumferential side relative to the sirocco blade portion 212 in the radial direction from the rotation axis of the impeller 200 as the center. Conversely, the sirocco blade portion 212 is provided on the outer circumferential side relative to the turbo blade portion 211 in the radial direction from the rotation axis of the impeller 200 as the center. The turbo blade portion 211 constitutes a backward curved blade formed at an outlet angle equal to or smaller than 90 degrees. The sirocco blade portion 212 constitutes a forward curved blade formed at an outlet angle larger than 90 degrees. The outlet angle is an angle formed between the center line of the blade 210 and the tangent of an outer diameter circle of the impeller 200 at the intersection of the outer diameter circle of the impeller 200 and the center line of the blade 210. The boundary between the turbo blade portion 211 and the sirocco blade portion 212 is illustrated by the dotted line in Fig. 8. The sirocco blade portion 212 is not necessarily provided. However, the airflow volume of the blower 100 can be increased by providing the sirocco blade portion 212.
Particularly as illustrated in Fig. 10, each of the plurality of blades 210 is formed such that on the inner circumferential side relative to an inner circumferential end portion 204, the height of the blade 210 from the plate surface of the main plate portion 201 is reduced more toward the inner circumferential side. The turbo blade portion 211 includes the inner circumferential end portion 204. Note that the position of the inner circumferential end portion 204 is illustrated by the dot-and-dash line in Fig. 8.
As illustrated in Fig. 2, when the blower 100 is viewed from a direction parallel to the rotation axis of the blower 100, the turbo blade portion 211 is exposed from the suction port of the blower 100. With this configuration, the turbo blade portion 211 helps improve the pressure recovery performance of the blower 100. This makes it possible to achieve an even lower input.
Note that the heat exchanger 4 is not limited to having an L-shape in top view. Other than the L-shape, as illustrated in Fig. 11, the heat exchanger 4 may have, for example, a U-shape or C-shape in top view. For another example, a plate heat exchanger 4 may be used.
As illustrated in Figs. 2 and 3, in the configuration example described here, at a location in the scroll casing 110 near the main plate portion 201 of the impeller 200, a protruding portion 113 is provided protruding toward the heat exchanger 4. Therefore, a distance C between the heat exchanger 4 and the location in the scroll casing 110 near the main plate portion 201 of the impeller 200, that is, the protruding portion 113 is shorter than a distance D between the heat exchanger 4 and a location in the scroll casing 110 near the side plate portions 203 of the impeller 200. With this configuration, the airflow having passed through the heat exchanger 4 is smoothly guided from the location near the main plate portion 201 of the impeller 200 to the location near the side plate portions 203 of the impeller 200 along the outer shape of the scroll casing 110, and then flows into the suction ports formed in the bellmouths on the scroll casing 110. Consequently, an inflow ability of the airflow from the heat exchanger 4 to the blower 100 can be improved to reduce the pressure loss, and an even lower input can be achieved. It is preferable that the tip end of the protruding portion 113 of the scroll casing 110 is formed into an arc shape. This allows the airflow having passed through the heat exchanger 4 to be more smoothly guided, and makes it possible to further improve the inflow ability of the airflow from the heat exchanger 4 to the blower 100.
In the configuration example described above, the outlet placement surface is the front surface of the housing 1. However, the outlet placement surface is not limited to being the front surface of the housing 1, but may be any surface of the housing 1. For example, Figs. 12 to 15 illustrate a configuration example when the outlet placement surface is the top surface of the housing 1. As illustrated in Fig. 12, a top panel 20 is provided on the top surface of a portion of the housing 1 where the blower chamber 3 is located. On the top panel 20, the outdoor-unit air outlets 11 are formed. Note that as illustrated in Fig. 13, the outdoor-unit air outlets 11 may be provided with the grid-like grilles 12. In this case, the grilles 12 may be attached to the top panel 20, or may be provided integrally with the top panel 20.
On the top panel 20, corresponding to the discharge ports 112, the outdoor-unit air outlets 11 are provided equal to the number of the discharge ports 112. In the illustrated configuration example, three blowers 100 are provided in the blower chamber 3, each of which has one discharge port 112. Accordingly, the outdoor unit has a total of three discharge ports 112 in its entirety. Therefore, on the top panel 20, three outdoor-unit air outlets 11 are formed. The position and size of the outdoor-unit air outlets 11 are adjusted to match the position and size of their corresponding discharge ports 112. That is, when the top panel 20 is properly attached to the housing 1, the discharge ports 112 are located in their corresponding outdoor-unit air outlets 11.
In this manner, the plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets 11 on the top panel 20. In this configuration example, the top surface of the housing, on which the top panel 20 is provided, is the outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, as illustrated in Figs. 14 and 15, the suction ports of each of the blowers 100 are located facing the directions toward the front surface and the back surface of the housing 1. That is, the rotation axis of the blower 100 is positioned along the front-rear direction.
A total width of the plurality of discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. In this example, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface includes at least the left-right direction. Therefore, even in this example, in other words, the total width of the discharge ports 112 in a direction perpendicular to the rotation axis of the blower 100 and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. Even in the configuration example as described above, it is still possible to obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and therefore achieve a low noise level and a low input without increasing the size of the outdoor unit.

Second Embodiment

A second embodiment of the present disclosure is described below with reference to Figs. 16 to 29. Fig. 16 is a front view of an outdoor unit of refrigeration cycle apparatus with a front panel removed from the outdoor unit. Fig. 17 is a cross-sectional view of the outdoor unit of refrigeration cycle apparatus. Figs. 18 and 19 are front views of the outdoor unit of refrigeration cycle apparatus. Fig. 20 is a front view illustrating a modification of the outdoor unit of refrigeration cycle apparatus with the front panel removed from the outdoor unit. Fig. 21 is a front view illustrating a first other example of the outdoor unit of refrigeration cycle apparatus with the front panel removed from the outdoor unit. Fig. 22 is a front view illustrating a second other example of the outdoor unit of refrigeration cycle apparatus with the front panel removed from the outdoor unit. Fig. 23 is a cross-sectional view illustrating the second other example of the outdoor unit of refrigeration cycle apparatus. Figs. 24 and 25 are front views illustrating the second other example of the outdoor unit of refrigeration cycle apparatus. Fig. 26 is a front view illustrating a modification of the outdoor unit of refrigeration cycle apparatus with the front panel removed from the outdoor unit. Fig. 27 is a front view illustrating the modification of the outdoor unit of refrigeration cycle apparatus. Fig. 28 is a perspective view of a blower included in the modification of the outdoor unit of refrigeration cycle apparatus. Fig. 29 is a cross-sectional view of the blower included in the modification of the outdoor unit of refrigeration cycle apparatus.
In the configuration of the outdoor unit in the first embodiment described above, each blower of the outdoor unit is provided with one discharge port. In contrast to this, in the second embodiment described here, two or more discharge ports are provided to one blower. Hereinafter, the outdoor unit of refrigeration cycle apparatus according to the second embodiment is described mainly focusing on differences from the first embodiment. Basically, descriptions of the same components as those in the first embodiment are omitted. In the descriptions below, the same or corresponding components as or to those in the first embodiment are basically denoted by the same reference signs as those used in the descriptions of the first embodiment.
In an example of the outdoor unit of refrigeration cycle apparatus according to the present embodiment, two blowers 100 are provided in the blower chamber 3 as illustrated in Figs. 16 and 17. Two discharge ports 112 are formed on each of the scroll casings 110 of the blowers 100. In this manner, each of the two blowers 100 has two discharge ports 112. Accordingly, the outdoor unit has a total of four discharge ports 112 in its entirety.
As illustrated in Fig. 18, the front panel 10 is provided on the front surface of a portion of the housing 1 where the blower chamber 3 is located. On the front panel 10, the outdoor-unit air outlets 11 are formed. Note that as illustrated in Fig. 19, the outdoor-unit air outlets 11 may be provided with the grid-like grilles 12.
On the front panel 10, corresponding to the discharge ports 112, the outdoor-unit air outlets 11 are provided equal to the number of the discharge ports 112. In the illustrated configuration example, the outdoor unit has a total of four discharge ports 112 in its entirety. Therefore, on the front panel 10, four outdoor-unit air outlets 11 are formed. The position and size of the outdoor-unit air outlets 11 are adjusted to match the position and size of their corresponding discharge ports 112. That is, when the front panel 10 is properly attached to the housing 1, the discharge ports 112 are located in their corresponding outdoor-unit air outlets 11.
In this manner, the plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets 11 on the front panel 10. In this configuration example, the front surface of the housing, on which the front panel 10 is provided, is the outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, the suction ports of each of the blowers 100 are located facing directions toward opposite left and right lateral surfaces of the housing 1. That is, the rotation axis of the blower 100 is positioned along the left-right direction. A total width of the discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. In this example, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface is the left-right direction. Note that as illustrated in Fig. 20, the blower chamber 3 may be provided on the upper side of the housing 1, while the machine chamber 2 may be provided on the lower side of the housing 1.
Even in the configuration example as described above, it is still possible to obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and therefore achieve a low noise level and a low input without increasing the size of the outdoor unit. The suction ports of the blower 100 are oriented in directions toward opposite left and right lateral surfaces of the housing 1, so that air can be efficiently suctioned particularly from the outdoor-unit air inlets 5 provided on the lateral surface of the housing 1. This makes it possible to increase the airflow volume and improve heat exchange efficiency.
Note that in this configuration example, the rotation axis of the blower 100 is positioned along the left-right direction. That is, the rotation axis of the impeller 200 is positioned parallel to the outlet placement surface described above. In this case, it is preferable for the impeller 200 to have a fan diameter larger than a half of a width of the blower chamber 3 in a direction perpendicular to the outlet placement surface, that is, in the front-rear direction. Having the fan diameter as described above can further increase the airflow volume, and consequently makes it possible to achieve an even lower noise level and an even lower input.
Next, several other examples of the outdoor unit of refrigeration cycle apparatus according to the present embodiment are described with reference to Figs. 21 to 29. First, Fig. 21 illustrates a first other configuration example of the outdoor unit of refrigeration cycle apparatus according to the present embodiment. In the first other configuration example, two blowers 100 are provided in the blower chamber 3 and arranged one above the other in the up-down direction. In Fig. 21, only one of the two blowers 100 is illustrated. Two discharge ports 112 are formed on each of the scroll casings 110 of the blowers 100. In this manner, each of the two blowers 100 has two discharge ports 112. Accordingly, the outdoor unit has a total of four discharge ports 112 in its entirety.
The plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets formed on the front panel (not illustrated). In this configuration example, the front surface of the housing, on which the front panel is provided, is the outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, the suction ports of each of the blowers 100 are located facing the directions toward the top surface and the bottom surface of the housing 1. That is, the rotation axis of the blower 100 is positioned along the up-down direction. A total width of the discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. In this example, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface is the left-right direction. Even in the configuration example as described above, it is still possible to obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and therefore achieve a low noise level and a low input without increasing the size of the outdoor unit.
Next, Figs. 22 to 25 illustrate a second other configuration example of the outdoor unit of refrigeration cycle apparatus according to the present embodiment. In the second other configuration example, as illustrated in Figs. 22 and 23, one blower 100 is provided in the blower chamber 3. Two discharge ports 112 are formed on the scroll casing 110 of the blower 100. In this manner, one blower 100 has two discharge ports 112. Accordingly, the outdoor unit has a total of two discharge ports 112 in its entirety.
As illustrated in Fig. 24, the front panel 10 is provided on the front surface of a portion of the housing 1 where the blower chamber 3 is located. On the front panel 10, the outdoor-unit air outlets 11 are formed. Note that as illustrated in Fig. 25, the outdoor-unit air outlets 11 may be provided with the grid-like grilles 12.
On the front panel 10, corresponding to the discharge ports 112, the outdoor-unit air outlets 11 are provided equal to the number of the discharge ports 112. In the illustrated configuration example, the outdoor unit has a total of two discharge ports 112 in its entirety. Therefore, on the front panel 10, two outdoor-unit air outlets 11 are formed. The position and size of the outdoor-unit air outlets 11 are adjusted to match the position and size of their corresponding discharge ports 112. That is, when the front panel 10 is properly attached to the housing 1, the discharge ports 112 are located in their corresponding outdoor-unit air outlets 11.
In this manner, the plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets 11 on the front panel 10. In this configuration example, the front surface of the housing, on which the front panel 10 is provided, is the outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, the suction ports of each of the blowers 100 are located facing the directions toward the front surface and the back surface of the housing 1. That is, the rotation axis of the blower 100 is positioned along the front-rear direction. A total width of the discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. In this example, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface is the left-right direction.
Even in the configuration example as described above, it is still possible to obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and therefore achieve a low noise level and a low input without increasing the size of the outdoor unit. The suction port of the blower 100 is oriented in the direction toward the back surface of the housing 1, so that air can be efficiently suctioned particularly from the outdoor-unit air inlets 5 provided on the back surface of the housing 1. This makes it possible to increase the airflow volume and improve heat exchange efficiency.
Figs. 26 to 29 illustrate a modification of the second other configuration example of the outdoor unit of refrigeration cycle apparatus according to the present embodiment. In this modification, as illustrated in Figs. 26, 28, and 29, two or more discharge ports 112 for one blower 100 are arranged radially when viewed from the front side of the housing 1. In the illustrated configuration example, six discharge ports 112 are provided to one blower 100. Each of the discharge ports 112 has, on its inner circumferential side, a shape of an arc of the circle centered at the rotation axis of the blower 100. In other words, each of the discharge ports 112 has, on its inner circumferential side, an arc shape made up of a portion of a circle concentric to the suction port of the blower 100. Each of the discharge ports 112 has, on its outer circumferential side, an arcuate shape made up of a portion of an ellipse centered at the rotation axis of the blower 100.
As illustrated in Fig. 27, on the front panel 10, corresponding to the discharge ports 112, the outdoor-unit air outlets 11 are provided equal to the number of the discharge ports 112. In the illustrated configuration example, the outdoor unit has a total of six discharge ports 112 in its entirety. Therefore, on the front panel 10, six outdoor-unit air outlets 11 are formed. The position and size of the outdoor-unit air outlets 11 are adjusted to match the position and size of their corresponding discharge ports 112. That is, when the front panel 10 is properly attached to the housing 1, the discharge ports 112 are located in their corresponding outdoor-unit air outlets 11.
In this manner, the plurality of discharge ports 112 are located in their corresponding outdoor-unit air outlets 11 on the front panel 10. In this configuration example, the front surface of the housing, on which the front panel 10 is provided, is the outlet placement surface. The plurality of discharge ports 112 are located on this outlet placement surface. In contrast, the suction ports of each blower 100 are located facing the directions toward the front surface and the back surface of the housing 1. That is, the rotation axis of the blower 100 is positioned along the front-rear direction. A total width of the discharge ports 112 in a direction horizontal with the housing 1 placed and parallel to the outlet placement surface is more than the width of the blower chamber 3 in the said direction. In this example, the direction horizontal with the housing 1 placed and parallel to the outlet placement surface is the left-right direction.
Even in the configuration example as described above, it is still possible to obtain a large airflow volume even when a static pressure external to the outdoor unit is high, and therefore achieve a low noise level and a low input without increasing the size of the outdoor unit. The suction port of the blower 100 is oriented in the direction toward the back surface of the housing 1, so that air can be efficiently suctioned particularly from the outdoor-unit air inlets 5 provided on the back surface of the housing 1. This makes it possible to increase the airflow volume and improve heat exchange efficiency. Furthermore, the discharge ports 112 of the blower 100 are arranged radially, so that air can be suctioned into the suction port evenly from the spaces between the discharge ports 112, and can be delivered from many discharge ports 112. Consequently, a further increase in the airflow volume can be achieved.

Industrial Applicability

The present disclosure is applicable to an outdoor unit of refrigeration cycle apparatus, in which the outdoor unit includes a double inlet centrifugal blower in a blower chamber of a housing.

Reference Signs List

1: Housing
2: Machine chamber
3: Blower chamber
4: Heat exchanger
5: Outdoor-unit air inlets
10: Front panel
11: Outdoor-unit air outlets
12: Grilles
20: Top panel
100: Blower
101: Motor
102: Shaft
110: Scroll casing
111: Bellmouths
112: Discharge port
113: Protruding portion
200: Impeller
201: Main plate portion
202: Boss portion
203: Side plate portions
204: Inner circumferential end portion
210: Blades
211: Turbo blade portion
212: Sirocco blade portion

Claims

An outdoor unit of refrigeration cycle apparatus comprising,
a housing in which a machine chamber and a blower chamber are formed, the blower chamber being partitioned from the machine chamber, the machine chamber housing a compressor inside, the blower chamber housing a heat exchanger and a blower inside, the blower being located on a secondary side of the heat exchanger, wherein

the blower is a double inlet centrifugal blower including:
an impeller having a plurality of blades arranged in a circumferential direction around a rotation axis, and

a scroll casing having a discharge port and two bellmouths which serve as suction ports, the scroll casing housing the impeller inside,

a plurality of the discharge ports are provided,

the plurality of the discharge ports are located on an outlet placement surface, the outlet placement surface being a front or top surface of the housing, and

a total width of the plurality of the discharge ports in a direction horizontal with the housing placed and parallel to the outlet placement surface is more than a width of the blower chamber in said direction.
The outdoor unit of refrigeration cycle apparatus according to claim 1, wherein
each of the plurality of blades of the impeller has a turbo blade portion constituting a backward curved blade formed at an outlet angle equal to or smaller than 90 degrees, and

when the blower is viewed from a direction parallel to the rotation axis, the turbo blade portion is exposed from the suction port.
The outdoor unit of refrigeration cycle apparatus according to claim 2, wherein each of the plurality of blades of the impeller further has a sirocco blade portion provided on an outer circumferential side relative to the turbo blade portion in a radial direction from the rotation axis as a center, and constituting a forward curved blade formed at an outlet angle larger than 90 degrees.
The outdoor unit of refrigeration cycle apparatus according to any one of claims 1 to 3, wherein
the blower has two or more of the discharge ports,

the outlet placement surface is a front surface of the housing, and

the suction ports of the blower are located facing directions toward the top surface and a bottom surface of the housing.
The outdoor unit of refrigeration cycle apparatus according to any one of claims 1 to 3, wherein
the blower has two or more of the discharge ports,

the outlet placement surface is the front surface of the housing, and

the suction ports of the blower are located facing directions toward opposite left and right lateral surfaces of the housing.
The outdoor unit of refrigeration cycle apparatus according to any one of claims 1 to 5, wherein
the rotation axis of the impeller is positioned parallel to the outlet placement surface, and

the impeller has a fan diameter larger than a half of a width of the blower chamber in a direction perpendicular to the outlet placement surface.
The outdoor unit of refrigeration cycle apparatus according to any one of claims 1 to 3, wherein
the blower has two or more of the discharge ports,

the outlet placement surface is the front surface of the housing, and

the suction ports of the blower are located facing directions toward the front surface and a back surface of the housing.
The outdoor unit of refrigeration cycle apparatus according to claim 7, wherein two or more of the discharge ports for the blower are arranged radially when viewed from a front side of the housing.
The outdoor unit of refrigeration cycle apparatus according to any one of claims 1 to 8, wherein a distance between the heat exchanger and a location in the scroll casing near a main plate portion of the impeller is shorter than a distance between the heat exchanger and a location in the scroll casing near a side plate portion of the impeller.
The outdoor unit of refrigeration cycle apparatus according to claim 9, wherein the location in the scroll casing near the main plate portion of the impeller has a protruding portion protruding toward the heat exchanger, and a tip end of the protruding portion is formed into an arc shape.