WO2021181695A1

WO2021181695A1 - Indoor unit and air-conditioning device

Info

Publication number: WO2021181695A1
Application number: PCT/JP2020/011236
Authority: WO
Inventors: 惇司河野; 拓矢寺本; 栗原　誠; 一樹磯村
Original assignee: 三菱電機株式会社
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2021-09-16
Also published as: JPWO2021181695A1; EP4119863A4; EP4119863A1; JP7378574B2

Abstract

An indoor unit (1) comprises a housing (2), a centrifugal fan (3), a heat exchanger (4), and a partition plate (5). The centrifugal fan (3) is housed in the housing (2), has a rotary shaft, and is configured so as to be rotatable about the rotary shaft. The heat exchanger (4) has: a first end (41) that is disposed so as to surround three-quarters or more of the outer circumference of the centrifugal fan (3) and disposed on the upstream side in the direction of rotation of the centrifugal fan (3); and a second end (42) that is disposed on the downstream side in the direction of rotation of the centrifugal fan (3) in spaced relationship to the first end (41). The partition plate (5) has a protrusion (51) protruding from the first end (41) and the second end (42) of the heat exchanger (4) toward the centrifugal fan (3). The apex (TP) of the protrusion (51) of the partition plate (5) is located closer to the first end (41) than to the second end (42).

Description

Indoor unit and air conditioner

This disclosure relates to an indoor unit and an air conditioner.

Conventionally, there is an air conditioner equipped with a 4-way cassette type indoor unit. This four-direction cassette type indoor unit is configured so that the wind blows out in four directions while being embedded in the ceiling. This four-way cassette type indoor unit includes a centrifugal fan, a heat exchanger arranged so as to surround the centrifugal fan, and a partition plate connecting both ends of the heat exchanger.

For example, Japanese Patent Application Laid-Open No. 9-49640 (Patent Document 1) describes a four-way cassette type indoor unit. In the indoor unit described in this publication, the partition plate is configured to project inside the heat exchanger.

Japanese Unexamined Patent Publication No. 9-49640

In the indoor unit described in the above publication, an air flow is generated by the rotation of the centrifugal fan. This air flow concentrates on the heat exchanger on the downstream side in the rotational direction of the centrifugal fan along the partition plate. Therefore, the pressure loss of the airflow flowing through the heat exchanger on the downstream side in the rotation direction of the centrifugal fan is large. In addition, the inflow of airflow into the heat exchanger on the upstream side in the rotation direction of the centrifugal fan is insufficient.

The present disclosure has been made in view of the above problems, and an object thereof is to suppress the pressure loss of the airflow flowing through the heat exchanger on the downstream side in the rotation direction of the centrifugal fan, and to rotate the centrifugal fan. It is to provide an indoor unit capable of facilitating the inflow of airflow into a heat exchanger on the upstream side in the direction and an air conditioner equipped with the indoor unit.

The indoor unit of the present disclosure includes a housing, a centrifugal fan, a heat exchanger, and a partition plate. The centrifugal fan is housed in a housing, has a rotating shaft, and is configured to be rotatable around the rotating shaft. The heat exchanger is arranged so as to surround three-quarters or more of the outer circumference of the centrifugal fan, and has a gap between the first end and the first end arranged on the upstream side in the rotation direction of the centrifugal fan. It has a second end located downstream in the direction of rotation of the centrifugal fan. The partition plate has protrusions protruding from the first and second ends of the heat exchanger toward the centrifugal fan. The apex of the convex portion of the partition plate is arranged closer to the first end than to the second end.

According to the indoor unit of the present disclosure, the apex of the convex portion of the partition plate is arranged closer to the first end than the second end. Therefore, it is possible to suppress the pressure loss of the airflow flowing through the heat exchanger on the downstream side in the rotation direction of the centrifugal fan. In addition, the inflow of airflow into the heat exchanger on the upstream side in the rotation direction of the centrifugal fan can be promoted.

It is a perspective view which shows typically the structure of the indoor unit which concerns on Embodiment 1. FIG. It is sectional drawing which follows the line II-II of FIG. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the first embodiment is removed. FIG. 5 is a perspective view schematically showing a configuration in which the panel of the indoor unit according to the first embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which a panel of a modified example of the indoor unit according to the first embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the second embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the third embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the fourth embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the fifth embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the sixth embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the seventh embodiment is removed. FIG. 5 is a perspective view schematically showing a configuration in which the panel of the indoor unit according to the seventh embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the eighth embodiment is removed. FIG. 5 is a perspective view schematically showing a configuration in which the panel of the indoor unit according to the eighth embodiment is removed. FIG. 5 is a bottom view schematically showing a configuration in which the panel of the indoor unit according to the ninth embodiment is removed. FIG. 5 is a perspective view schematically showing a configuration in which the panel of the indoor unit according to the ninth embodiment is removed. FIG. 5 is a refrigerant circuit diagram of the air conditioner according to the tenth embodiment.

Hereinafter, the embodiment will be described with reference to the figure. In the following, the same or corresponding parts shall be designated by the same reference numerals, and duplicate explanations will not be repeated.

Embodiment 1.
The configuration of the indoor unit 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. The indoor unit 1 according to the first embodiment is a four-way cassette type indoor unit. The indoor unit 1 according to the first embodiment is a ceiling-embedded indoor unit. The indoor unit 1 according to the first embodiment is an indoor unit of a packaged air conditioner.

FIG. 1 is a perspective view showing the indoor unit 1 according to the first embodiment from below. The indoor unit 1 according to the first embodiment is embedded in the ceiling in the state shown in FIG. FIG. 2 is a cross-sectional view showing the internal structure of the indoor unit 1 according to the first embodiment from the side. FIG. 3 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the first embodiment is removed from below. In FIG. 3, for the sake of clarity, the piping connected to the heat exchanger 4 is not shown. Further, in FIGS. 3 and 3 onward, the configuration is simplified and illustrated for easy viewing. FIG. 4 is a perspective view showing a configuration in which the panel 22 of the indoor unit 1 according to the first embodiment is removed from below.

With reference to FIGS. 1 and 2, the indoor unit 1 according to the first embodiment includes a housing 2, a centrifugal fan 3, a heat exchanger 4, a partition plate 5, a motor 6, and a bell mouth 7. , The filter 8 is provided. A centrifugal fan 3, a heat exchanger 4, a partition plate 5, a motor 6, a bell mouth 7, and a filter 8 are housed in the housing 2.

The housing 2 has a casing 21 and a panel 22. The casing 21 has a top plate portion 21a and a side wall portion 21b. The top plate portion 21a is arranged at the upper end of the casing 21. The side wall portion 21b is connected to the outer edge of the top plate portion 21a. The side wall portion 21b extends from the top plate portion 21a toward the panel 22. The side wall portion 21b is configured to surround the heat exchanger 4.

The panel 22 is attached to the lower end of the casing 21. In a plan view, the panel 22 is configured to have a substantially square shape. The panel 22 has a suction port 23, an outlet 24, and a louver 25. At least one suction port 23 is provided on the panel 22. At least one outlet 24 is provided on the panel 22. In the indoor unit 1 according to the first embodiment, the panel 22 is provided with one suction port 23 and four outlets 24. In a plan view, the suction port 23 is configured to have a substantially square shape. The suction port 23 is arranged in the center of the panel 22. A grill is provided at the suction port 23.

In a plan view, each of the four outlets 24 is configured to have a substantially rectangular shape. In plan view, each of the four outlets 24 is located outside the suction port 23. Each of the four outlets 24 is provided between the outer edge of the panel 22 and the suction port 23. The four outlets 24 are arranged on all sides of the suction port 23. Each of the four outlets 24 is arranged along each of the four sides of the panel 22. Each of the four louvers 25 is arranged in each of the four outlets 24. The louver 25 is configured to adjust the flow of the airflow blown out from the outlet 24 in the vertical direction and the horizontal direction.

The centrifugal fan 3 is housed in the housing 2. The centrifugal fan 3 has a rotation shaft 3a. The centrifugal fan 3 is configured to be rotatable around a rotation shaft 3a. The plan view is a view when the centrifugal fan 3 is viewed along the rotation axis 3a. The centrifugal fan 3 is configured to generate an air flow by rotating around a rotation shaft 3a.

The heat exchanger 4 is arranged between the side wall portion 21b of the housing 2 and the centrifugal fan 3. The heat exchanger 4 is arranged with a gap from the side wall portion 21b of the housing 2. The heat exchanger 4 is arranged with a gap from the centrifugal fan 3. The heat exchanger 4 is arranged in a flow path of air that is sucked into the housing 2 from the suction port 23 by the centrifugal fan 3 and blown out into the room (target space) from the four outlets 24. In the heat exchanger 4, heat exchange is performed between the air flowing outside the heat exchanger 4 and the refrigerant flowing inside the heat exchanger 4.

The heat exchanger 4 has a plurality of fins F and a heat transfer tube P. The plurality of fins F are arranged at intervals from each other. The heat transfer tube P extends so as to penetrate the plurality of fins F. The heat transfer tube P is configured so that the refrigerant flows inside the heat transfer tube P.

The partition plate 5 is connected to both ends of the heat exchanger 4. The partition plate 5 is arranged with a gap from the side wall portion 21b of the housing 2. The partition plate 5 is arranged at a distance from the centrifugal fan 3. The partition plate 5 is formed in a plate shape. The partition plate 5 is configured to partition the space where the centrifugal fan 3 is located and the space where the piping connected to the heat exchanger 4 is located.

The motor 6 is arranged in the center of the top plate portion 21a of the casing 21. The motor 6 is attached to the center of the top plate portion 21a of the casing 21. The motor 6 has a drive unit 61, a motor shaft 62, and a connecting member 63. The drive unit 61 is configured to rotate the motor shaft 62. The drive unit 61 is attached to the center of the top plate portion 21a of the casing 21. The motor shaft 62 is configured to rotate in the circumferential direction of the motor shaft 62. The motor shaft 62 extends from the drive unit 61 toward the panel 22. The connecting member 63 is attached to the outer peripheral surface of the motor shaft 62. The connecting member 63 is configured to connect the motor shaft 62 and the centrifugal fan 3. The motor 6 is configured to rotate the centrifugal fan 3 in the rotation direction of the motor shaft 62.

A bell mouth 7 is arranged between the centrifugal fan 3 and the suction port 23 of the panel 22. The bell mouth 7 is configured to guide the air sucked from the suction port 23 of the panel 22 to the centrifugal fan 3.

A filter 8 is arranged between the bell mouth 7 and the suction port 23 of the panel 22. The filter 8 is configured to remove dust from the air that has flowed into the housing 2 from the suction port 23 of the panel 22.

The configuration of the centrifugal fan 3 will be described in more detail with reference to FIGS. 2 and 3.
In a plan view, the centrifugal fan 3 is configured to have a substantially circular shape. The centrifugal fan 3 has a main plate 31, a side plate 32, and a plurality of blades 33.

The main plate 31 is connected to the connecting member 63 of the motor 6. The main plate 31 has a central portion 31a, a first flat plate portion 31b, an inclined portion 31c, and a second flat plate portion 31d. In a plan view, the central portion 31a is arranged at the center of the main plate 31. The central portion 31a is formed in a substantially cylindrical shape. A through hole H is provided in the central portion 31a. The connecting member 63 is attached to the central portion 31a in a state where the connecting member 63 is inserted into the through hole H of the central portion 31a. As a result, the main plate 31 is attached to the motor shaft 62 of the motor 6 via the connecting member 63. Therefore, the main plate 31 can be rotated about the rotation shaft 3a by the rotational force of the motor 6.

The first flat plate portion 31b is connected to the central portion 31a. In a plan view, the first flat plate portion 31b is arranged outside the central portion 31a. The inclined portion 31c is connected to the first flat plate portion 31b. In a plan view, the inclined portion 31c is arranged outside the first flat plate portion 31b. The inclined portion 31c is inclined so as to spread from the first flat plate portion 31b toward the second flat plate portion 31d. The second flat plate portion 31d is connected to the inclined portion 31c. In a plan view, the second flat plate portion 31d is arranged outside the inclined portion 31c. The second flat plate portion 31d is arranged closer to the top plate portion 21a of the housing 2 than the first flat plate portion 31b.

The side plate 32 is arranged at a distance from the main plate 31 in the extending direction of the rotation shaft 3a. In a plan view, the side plate 32 is formed in an annular shape. An opening OP is provided in the center of the side plate 32. The centrifugal fan 3 is configured so that air flows into the centrifugal fan 3 from the opening OP. In a plan view, the side plate 32 is arranged on the outer edge of the centrifugal fan 3.

The plurality of wings 33 are arranged between the main plate 31 and the side plate 32. The plurality of wings 33 are arranged on the second flat plate portion 31d of the main plate 31. The upper ends of each of the plurality of blades 33 are attached to the second flat plate portion 31d of the main plate 31. The lower ends of each of the plurality of wings 33 are attached to the side plates 32.

The configurations of the heat exchanger 4 and the partition plate 5 will be described in more detail with reference to FIGS. 3 and 4.

The heat exchanger 4 is arranged so as to surround the centrifugal fan 3 in the circumferential direction of the centrifugal fan 3. In a plan view, the heat exchangers 4 are arranged in a substantially square shape. The heat exchanger 4 is arranged so as to surround three-quarters or more of the outer circumference of the centrifugal fan 3. The heat exchangers 4 are arranged on all sides of the centrifugal fan 3.

The heat exchanger 4 has a first end 41 and a second end 42. The first end 41 is one end in the circumferential direction of the heat exchanger 4. The second end 42 is the other end in the circumferential direction of the heat exchanger 4. The first end 41 and the second end 42 are arranged with a gap from each other. The first end 41 and the second end 42 are arranged at one corner of the heat exchanger 4 in a substantially quadrangular shape. That is, the first end 41 and the second end 42 are arranged at one corner of the casing 21. The first end 41 is arranged on the upstream side in the rotation direction of the centrifugal fan 3. That is, the first end 41 is arranged on the upstream side of the second end 42 in the rotation direction of the centrifugal fan 3. The second end 42 is arranged on the downstream side in the rotation direction of the centrifugal fan 3 with a gap from the first end 41. That is, the second end 42 is arranged on the downstream side of the first end 41 in the rotation direction of the centrifugal fan 3.

The partition plate 5 is connected to both ends of the heat exchanger 4 in the circumferential direction. That is, the partition plate 5 is connected to the first end 41 and the second end 42. The partition plate 5 has a convex portion 51. The convex portion 51 projects from the first end 41 and the second end 42 of the heat exchanger 4 toward the centrifugal fan 3. The convex portion 51 protrudes toward the centrifugal fan 3 side from the virtual line connecting the first end 41 and the second end 42 on the inner peripheral side of the heat exchanger 4.

The apex TP of the convex portion 51 of the partition plate 5 is arranged closer to the first end 41 than to the second end 42. The apex TP is arranged on the upstream side in the rotation direction of the centrifugal fan 3 from the midpoint of the virtual line connecting the first end 41 and the second end 42 on the inner peripheral side of the heat exchanger 4. That is, the apex TP is located on the opposite rotation direction side of the centrifugal fan 3 from the midpoint of the virtual line connecting the first end and the second end 42 on the inner peripheral side of the heat exchanger 4.

The convex portion 51 of the partition plate 5 has a first plate portion 51a and a second plate portion 51b. The first plate portion 51a is configured to connect the apex TP and the first end 41. The second plate portion 51b is configured to connect the apex TP and the second end 42. In a plan view, the length of the first plate portion 51a is shorter than the length of the second plate portion 51b. The portion where the first plate portion 51a and the second plate portion 51b are connected to each other constitutes the vertex TP. The vertex TP is configured to be sharp.

Next, the operation of the indoor unit 1 according to the first embodiment will be described with reference to FIGS. 1 to 3 again.

With reference to FIGS. 1 and 2, the rotation of the centrifugal fan 3 causes the air in the room (target space) to be sucked into the housing 2 from the suction port 23 of the panel 22. Dust is removed by the filter 8 from the air sucked into the housing 2 from the suction port 23 of the panel 22. The air that has passed through the filter 8 is guided to the centrifugal fan 3 by the bell mouth 7. The air sucked into the centrifugal fan 3 from the opening OP provided in the side plate 32 of the centrifugal fan 3 passes between the plurality of blades 33 and is blown outward in the radial direction of the centrifugal fan 3. The air thus blown out flows toward the heat exchanger 4. When the air passes outside the heat exchanger 4, heat exchange is performed between the air outside the heat exchanger 4 and the refrigerant inside the heat exchanger 4. The air that has undergone heat exchange with the refrigerant in the heat exchanger 4 passes through the space between the heat exchanger 4 and the side wall portion 21b of the housing 2, and enters the room (target space) from the four outlets 24. ) Is blown out.

With reference to FIG. 3, a part of the air blown out from the centrifugal fan 3 flows toward the partition plate 5. The airflow AF flowing through the partition plate 5 exchanges heat along the convex portion 51 of the partition plate 5 with the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 and the heat exchange on the downstream side in the rotation direction D1 of the centrifugal fan 3. It flows into the vessel 4b. Specifically, the airflow AF flows to the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 along the inner peripheral surface of the first plate portion 51a of the convex portion 51 of the partition plate 5. Further, the airflow AF flows along the inner peripheral surface of the second plate portion 51b of the convex portion 51 of the partition plate 5 to the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3.

The angle formed by the heat exchanger 4b on the downstream side of the rotation direction D1 of the centrifugal fan 3 and the second plate portion 51b of the convex portion 51 of the partition plate 5 is an obtuse angle. That is, the angle formed by the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3 and the second plate portion 51b of the convex portion 51 of the partition plate 5 is larger than 90 degrees. Therefore, the concentration of the airflow AF on the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3 is suppressed. Further, the peeling of the airflow AF from the second plate portion 51b of the convex portion 51 of the partition plate 5 is suppressed.

Further, the angle formed by the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 and the first plate portion 51a of the convex portion 51 of the partition plate 5 is an acute angle. That is, the angle formed by the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 and the first plate portion 51a of the convex portion 51 of the partition plate 5 is smaller than 90 degrees. Therefore, the inflow of the airflow AF into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 is promoted.

Subsequently, a modified example of the indoor unit 1 according to the first embodiment will be described with reference to FIG.
FIG. 5 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the first embodiment is removed from below. In the modified example of the indoor unit 1 according to the first embodiment, the first plate portion 51a and the second plate portion 51b are smoothly connected at the apex TP. That is, the vertex TP is composed of a curved surface.

Next, the operation and effect of the indoor unit 1 according to the first embodiment will be described.
According to the indoor unit 1 according to the first embodiment, the apex TP of the convex portion 51 of the partition plate 5 is arranged closer to the first end 41 than to the second end 42. Therefore, it is possible to suppress the concentration of the air flow on the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3. Therefore, it is possible to suppress the pressure loss of the airflow flowing through the heat exchanger 4b on the downstream side in the rotation direction of the centrifugal fan 3. Further, it is possible to promote the inflow of the air flow into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3.

Concentration of airflow to the heat exchanger 4b on the downstream side of the rotation direction D1 of the centrifugal fan 3 can be suppressed, and the inflow of airflow to the heat exchanger 4a on the upstream side of the rotation direction D1 of the centrifugal fan 3 is promoted. Therefore, the wind velocity distribution of the airflow passing through the heat exchanger 4 can be made uniform.

Further, since the apex TP of the convex portion 51 of the partition plate 5 is arranged closer to the first end 41 than the second end 42, the partition plate 5 is partitioned from the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3. The angle formed by the convex portion 51 of the plate 5 with the second plate portion 51b is an obtuse angle. Therefore, the angle formed by the heat exchanger 4b on the downstream side in the rotation direction D1 of the centrifugal fan 3 and the second plate portion 51b of the convex portion 51 of the partition plate 5 becomes gentle. Therefore, it is possible to suppress the separation of the airflow from the second plate portion 51b of the convex portion 51 of the partition plate 5.

Since the pressure loss of the airflow flowing through the heat exchanger 4b on the downstream side in the rotation direction of the centrifugal fan 3 can be suppressed, the power consumption of the motor 6 for rotating the centrifugal fan 3 can be reduced. Further, since the pressure loss of the airflow flowing through the heat exchanger 4b on the downstream side in the rotation direction of the centrifugal fan 3 can be suppressed, the rotation speed of the centrifugal fan 3 can be reduced. Thereby, the noise generated by the rotation of the centrifugal fan 3 can be reduced.

According to the indoor unit 1 according to the first embodiment, the heat exchangers 4 are arranged on all sides of the centrifugal fan 3. Therefore, heat can be exchanged between the air flowing outside the heat exchanger 4 and the refrigerant flowing inside the heat exchanger 4 on all four sides of the centrifugal fan 3. Therefore, the 4-way cassette type indoor unit 1 can be configured.

Embodiment 2.
The configuration of the indoor unit 1 according to the second embodiment will be described with reference to FIG. FIG. 6 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the second embodiment is removed from below.

In the indoor unit 1 according to the second embodiment, when the centrifugal fan 3 is viewed along the rotating shaft 3a, the virtual line connecting the rotating shaft 3a of the centrifugal fan 3 and the apex TP is set as the first virtual line A1 and the apex. The virtual line connecting the TP and the first end 41 is referred to as the second virtual line A2, and the virtual line connecting the vertex TP and the second end 42 is referred to as the third virtual line A3. At this time, the first angle θa formed by the first virtual line A1 and the second virtual line A2 is larger than the second angle θb formed by the first virtual line A1 and the third virtual line A3. The second virtual line A2 is arranged along the inner peripheral surface of the first plate portion 51a. The third virtual line A3 is arranged along the inner peripheral surface of the second plate portion 51b.

Next, the operation and effect of the indoor unit 1 according to the second embodiment will be described.
According to the indoor unit 1 according to the second embodiment, the first angle θa formed by the first virtual line A1 and the second virtual line A2 is the second angle formed by the first virtual line A1 and the third virtual line A3. Greater than θb. Therefore, the angle formed by the direction of the air flow and the second virtual line A2 becomes small. Therefore, the separation of the airflow in the second plate portion 51b of the convex portion 51 of the partition plate 5 can be further suppressed.

Embodiment 3.
The configuration of the indoor unit 1 according to the third embodiment will be described with reference to FIG. 7. FIG. 7 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the third embodiment is removed from below.

In the indoor unit 1 according to the third embodiment, when the centrifugal fan 3 is viewed along the rotating shaft 3a, the virtual line connecting the rotating shaft 3a of the centrifugal fan 3 and the first end 41 is referred to as the fourth virtual line A4. do. At this time, the apex TP is arranged on the upstream side in the rotation direction D1 of the centrifugal fan 3 with respect to the fourth virtual line A4. The apex TP is arranged on the upstream side in the rotation direction of the centrifugal fan 3 with respect to the first end 41.

Next, the operation and effect of the indoor unit 1 according to the third embodiment will be described.
According to the indoor unit 1 according to the third embodiment, the apex TP is arranged upstream of the fourth virtual line A4 in the rotation direction D1 of the centrifugal fan 3. Therefore, the inflow of the air flow into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 can be further promoted. Therefore, the wind speed distribution of the airflow passing through the heat exchanger 4 can be made uniform.

Embodiment 4.
The configuration of the indoor unit 1 according to the fourth embodiment will be described with reference to FIG. FIG. 8 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the fourth embodiment is removed from below.

In the indoor unit 1 according to the fourth embodiment, the convex portion 51 of the partition plate 5 has a first plate portion 51a that connects the apex TP and the first end 41. The first plate portion 51a is configured to protrude toward the second end 42. The first plate portion 51a is curved so as to protrude toward the second end 42. The first plate portion 51a is curved so as to protrude toward the space where the pipe connected to the heat exchanger 4 is located.

Next, the operation and effect of the indoor unit 1 according to the fourth embodiment will be described.
According to the indoor unit 1 according to the fourth embodiment, the first plate portion 51a is configured to protrude toward the second end 42. Therefore, the air flow tends to flow vertically into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3. Therefore, the inflow of the air flow into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 can be further promoted.

Embodiment 5.
The configuration of the indoor unit 1 according to the fifth embodiment will be described with reference to FIG. FIG. 9 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the fifth embodiment is removed from below.

In the indoor unit 1 according to the fifth embodiment, the convex portion 51 of the partition plate 5 has a second plate portion 51b that connects the apex TP and the second end 42. The second plate portion 51b is configured to protrude toward the centrifugal fan 3. The second plate portion 51b is curved so as to protrude toward the centrifugal fan 3. Further, the first plate portion 51a is configured to protrude toward the second end 42.

Next, the operation and effect of the indoor unit 1 according to the fifth embodiment will be described.
According to the indoor unit 1 according to the fifth embodiment, the second plate portion 51b is configured to protrude toward the centrifugal fan 3. Therefore, the separation of the airflow from the second plate portion 51b of the convex portion 51 of the partition plate 5 can be further suppressed.

Further, the first plate portion 51a is configured to protrude toward the second end 42. Therefore, the air flow tends to flow vertically into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3. Therefore, the inflow of the air flow into the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 can be further promoted.

Embodiment 6.
The configuration of the indoor unit 1 according to the sixth embodiment will be described with reference to FIG. FIG. 10 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the sixth embodiment is removed from below.

In the indoor unit 1 according to the sixth embodiment, the distance (first distance) n between the centrifugal fan 3 and the apex TP is shorter than the distance (second distance) m between the centrifugal fan 3 and the heat exchanger 4. The distance n between the centrifugal fan 3 and the apex TP is the shortest distance between the centrifugal fan 3 and the apex TP when the centrifugal fan 3 is viewed along the rotation axis 3a. The distance m between the centrifugal fan 3 and the heat exchanger 4 is the shortest distance between the centrifugal fan 3 and the apex TP when the centrifugal fan 3 is viewed along the rotation axis 3a.

Next, the operation and effect of the indoor unit 1 according to the sixth embodiment will be described.
According to the indoor unit 1 according to the sixth embodiment, the distance n between the centrifugal fan 3 and the apex TP is shorter than the distance m between the centrifugal fan 3 and the heat exchanger 4. Therefore, the pressure loss of the airflow flowing through the heat exchanger 4b on the downstream side in the rotation direction of the centrifugal fan 3 can be suppressed, and the airflow to the heat exchanger 4a on the upstream side in the rotation direction D1 of the centrifugal fan 3 can be suppressed. The effect of promoting inflow can be sufficiently ensured.

Embodiment 7.
The configuration of the indoor unit 1 according to the seventh embodiment will be described with reference to FIGS. 11 and 12. FIG. 11 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the seventh embodiment is removed from below. FIG. 12 is a perspective view showing a configuration in which the panel 22 of the indoor unit 1 according to the seventh embodiment is removed from below.

In the indoor unit 1 according to the seventh embodiment, the centrifugal fan 3 has a main plate 31 and a side plate 32 connected to the main plate 31. The convex portion 51 of the partition plate 5 has a second plate portion 51b that connects the apex TP and the second end 42. The second plate portion 51b has a main plate side portion 51b1 facing the main plate 31 and a side plate side portion 51b2 facing the side plate 32. The side plate side portion 51b2 is configured to project toward the centrifugal fan 3 from the main plate side portion 51b1.

When viewed as a centrifugal fan 3 along the rotating shaft 3a, the angle formed by the virtual line connecting the rotating shaft 3a of the centrifugal fan 3 and the apex TP of the convex portion 51 of the partition plate 5 and the side plate side portion 51b2 is virtual. It is smaller than the angle formed by the wire and the main plate side portion 51b1.

Next, the operation and effect of the indoor unit 1 according to the seventh embodiment will be described.
According to the indoor unit 1 according to the seventh embodiment, the side plate side portion 51b2 is configured to project toward the centrifugal fan 3 from the main plate side portion 51b1. The swirling component of the airflow blown out from the centrifugal fan 3 in the rotation direction D1 of the centrifugal fan 3 is larger on the side plate 32 side than on the main plate 31 side. Since the side plate side portion 51b2 is configured to project toward the centrifugal fan 3 from the main plate side portion 51b1, it is possible to suppress the separation of the air flow in the second plate portion 51b of the convex portion 51 of the partition plate 5. ..

Embodiment 8.
The configuration of the indoor unit 1 according to the eighth embodiment will be described with reference to FIGS. 13 and 14. FIG. 13 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the eighth embodiment is removed from below. FIG. 14 is a perspective view showing a configuration in which the panel 22 of the indoor unit 1 according to the seventh embodiment is removed from below.

In the indoor unit 1 according to the eighth embodiment, the centrifugal fan 3 has a main plate 31 and a side plate 32 connected to the main plate 31. The convex portion 51 of the partition plate 5 has a second plate portion 51b that connects the apex TP and the second end 42. The second plate portion 51b has a main plate side portion 51b1 facing the main plate 31 and a side plate side portion 51b2 facing the side plate 32. The distance between the centrifugal fan 3 and the apex TP of the main plate side portion 51b1 is longer than the distance between the centrifugal fan 3 and the apex TP of the side plate side portion 51b2.

When the centrifugal fan 3 is viewed along the rotation axis 3a, the shortest distance between the centrifugal fan 3 and the apex TP of the main plate side portion 51b1 is longer than the shortest distance between the centrifugal fan 3 and the apex TP of the side plate side portion 51b2. ..

Next, the operation and effect of the indoor unit 1 according to the eighth embodiment will be described.
According to the indoor unit 1 according to the eighth embodiment, the distance between the centrifugal fan 3 and the apex TP of the main plate side portion 51b1 is longer than the distance between the centrifugal fan 3 and the apex TP of the side plate side portion 51b2. The wind speed of the airflow blown out from the centrifugal fan 3 is higher on the main plate 31 side than on the side plate 32 side. Since the distance between the centrifugal fan 3 and the apex TP of the main plate side portion 51b1 is longer than the distance between the centrifugal fan 3 and the apex TP of the side plate side portion 51b2, in the plane of the second plate portion 51b of the convex portion 51 of the partition plate 5. Pressure fluctuation can be suppressed. Thereby, noise can be reduced.

Embodiment 9.
The configuration of the indoor unit 1 according to the ninth embodiment will be described with reference to FIGS. 15 and 16. FIG. 15 is a bottom view showing a configuration in which the panel 22 of the indoor unit 1 according to the ninth embodiment is removed from below. FIG. 16 is a perspective view showing a configuration in which the panel 22 of the indoor unit 1 according to the ninth embodiment is removed from below.

In the indoor unit 1 according to the ninth embodiment, the partition plate 5 is provided with a slit SL. The slit SL penetrates the partition plate 5 in the thickness direction. A plurality of slit SLs are provided. The slit SL is provided in the first plate portion 51a and the second plate portion 51b of the convex portion 51 of the partition plate 5, respectively.

Next, the operation and effect of the indoor unit according to the ninth embodiment will be described.
According to the indoor unit 1 according to the ninth embodiment, the partition plate 5 is provided with the slit SL. Therefore, it is possible to prevent the pressure on the inner peripheral surface of the partition plate 5 from becoming too high. Thereby, noise can be suppressed.

Embodiment 10.
The configuration of the air conditioner 100 according to the tenth embodiment will be described with reference to FIG. FIG. 17 is a refrigerant circuit diagram of the air conditioner of the tenth embodiment.

The air conditioner 100 according to the tenth embodiment includes the indoor unit 1 described above. The air conditioner 100 includes an indoor unit 1 and an outdoor unit 200. The outdoor unit 200 is connected to the indoor unit 1. The indoor unit 1 and the outdoor unit 200 are connected by a refrigerant pipe. As a result, the refrigerant circuit is configured. Refrigerant circulates in the refrigerant circuit. Of the refrigerant pipes, the pipe through which the gaseous refrigerant (gas refrigerant) flows constitutes the gas pipe 300, and the pipe through which the liquid refrigerant (liquid refrigerant or gas-liquid two-phase refrigerant) flows constitutes the liquid pipe 400. ..

The outdoor unit 200 includes a compressor 201, a four-way valve 202, an outdoor heat exchanger 203, an outdoor blower 204, and a throttle device (expansion valve) 205.

The compressor 201 is configured to compress and discharge the sucked refrigerant. The compressor 201 is provided with an inverter device or the like, and is configured so that the capacity of the compressor 201 (the amount of refrigerant delivered per unit time) can be changed by changing the operating frequency. The four-way valve 202 is configured to switch the flow of the refrigerant by switching the valve between the cooling operation and the heating operation based on an instruction from a control device (not shown).

The outdoor heat exchanger 203 is configured to exchange heat between the refrigerant inside the outdoor heat exchanger 203 and the air outside the outdoor heat exchanger 203 (outdoor air).

The outdoor heat exchanger 203 functions as a condenser during the cooling operation. In the outdoor heat exchanger 203, the refrigerant compressed in the compressor 201 flows into the outdoor heat exchanger 203 through the four-way valve 202. In the outdoor heat exchanger 203, heat exchange is performed between the refrigerant inside the outdoor heat exchanger 203 and the air outside the outdoor heat exchanger 203. As a result, the refrigerant condenses in the outdoor heat exchanger 203.

The outdoor heat exchanger 203 functions as an evaporator during the heating operation. In the outdoor heat exchanger 203, heat exchange is performed between the low-pressure refrigerant flowing from the liquid pipe 400 and the air. As a result, the refrigerant evaporates in the outdoor heat exchanger 203.

In order to efficiently exchange heat between the refrigerant and air in the outdoor heat exchanger 203, an outdoor blower 204 having a fan, a fan motor, and the like is provided. The outdoor blower 204 may be configured so that the rotation speed of the fan can be changed by changing the operating frequency of the fan motor by an inverter device. The throttle device (expansion valve) 205 is configured to reduce the pressure of the refrigerant by expanding the refrigerant.

The indoor unit 1 includes a centrifugal fan 3 and a heat exchanger 4. The centrifugal fan 3 is configured to regulate the flow of air in which heat exchange takes place in the heat exchanger 4. The heat exchanger 4 functions as an evaporator during the cooling operation. Heat is exchanged between the refrigerant decompressed by the throttle device (expansion valve) 205 and flowing into the heat exchanger 4 and the air outside the heat exchanger 4. As a result, the refrigerant evaporates in the heat exchanger 4. The evaporated refrigerant flows out of the heat exchanger 4 through the gas pipe 300. The heat exchanger 4 functions as a condenser during the heating operation. Heat exchange is performed between the refrigerant flowing into the heat exchanger 4 from the gas pipe 300 and the air outside the heat exchanger 4. As a result, the refrigerant condenses in the heat exchanger 4. Therefore, the refrigerant is liquefied (or gas-liquid two-phase). The liquefied (or gas-liquid two-phase) refrigerant flows out to the liquid pipe 400.

In the air conditioner 100 according to the tenth embodiment, the indoor unit 1 according to the first to ninth embodiments can be used. Therefore, according to the air conditioner 100 according to the tenth embodiment, it is possible to realize the air conditioner 100 that exhibits the effect of the indoor unit 1 according to the first to ninth embodiments.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is indicated by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

1 indoor unit, 2 housing, 3 centrifugal fan, 3a rotating shaft, 4 heat exchanger, 5 partition plate, 6 motor, 21 casing, 22 panel, 23 suction port, 24 outlet, 31 main plate, 32 side plate, 33 wings , 41 1st end, 42 2nd end, 51 convex part, 51a 1st plate part, 51b 2nd plate part, 51b1 main plate side part, 51b2 side plate side part, 100 air exchanger, 200 outdoor unit, 201 compressor, 202 four-way valve, 203 outdoor heat exchanger, 204 outdoor blower, 300 gas piping, 400 liquid piping, A1 1st virtual line, A2 2nd virtual line, A3 3rd virtual line, A4 4th virtual line, D1 rotation Direction, SL slit, TP apex, m distance between centrifugal fan and heat exchanger, n distance between centrifugal fan and apex.

Claims

With the housing
A centrifugal fan housed in the housing, having a rotating shaft, and rotatably configured around the rotating shaft.
The centrifugal fan is arranged so as to surround three-quarters or more of the outer circumference of the centrifugal fan, and has a gap between the first end arranged upstream in the rotation direction of the centrifugal fan and the first end. A heat exchanger having a second end located downstream in the direction of rotation of the fan,
A partition plate having a convex portion protruding from the first end and the second end of the heat exchanger toward the centrifugal fan is provided.
An indoor unit in which the apex of the convex portion of the partition plate is arranged closer to the first end than to the second end.
The indoor unit according to claim 1, wherein the heat exchangers are arranged on all sides of the centrifugal fan.
When the centrifugal fan is viewed along the rotation axis, the virtual line connecting the rotation axis of the centrifugal fan and the apex is defined as the first virtual line, and the virtual line connecting the apex and the first end is defined as the first virtual line. When the second virtual line is used and the virtual line connecting the apex and the second end is used as the third virtual line,
The indoor unit according to claim 1 or 2, wherein the first angle formed by the first virtual line and the second virtual line is larger than the second angle formed by the first virtual line and the third virtual line. ..
When the centrifugal fan is viewed along the rotation axis, when the virtual line connecting the rotation axis of the centrifugal fan and the first end is set as the fourth virtual line,
The indoor unit according to claim 1 or 2, wherein the apex is arranged on the upstream side in the rotation direction of the centrifugal fan with respect to the fourth virtual line.
The convex portion of the partition plate has a first plate portion that connects the apex and the first end.
The indoor unit according to any one of claims 1 to 4, wherein the first plate portion is configured to protrude toward the second end.
The convex portion of the partition plate has a second plate portion that connects the apex and the second end.
The indoor unit according to any one of claims 1 to 5, wherein the second plate portion is configured to protrude toward the centrifugal fan.
The centrifugal fan has a main plate and a side plate connected to the main plate.
The convex portion of the partition plate has a second plate portion that connects the apex and the second end.
The second plate portion has a main plate side portion facing the main plate and a side plate side portion facing the side plate.
The indoor unit according to any one of claims 1 to 5, wherein the side plate side portion is configured to project from the main plate side portion toward the centrifugal fan.
The centrifugal fan has a main plate and a side plate connected to the main plate.
The convex portion of the partition plate has a second plate portion that connects the apex and the second end.
The second plate portion has a main plate side portion facing the main plate and a side plate side portion facing the side plate.
The indoor unit according to any one of claims 1 to 5, wherein the distance between the centrifugal fan and the apex of the main plate side portion is longer than the distance between the centrifugal fan and the apex of the side plate side portion.
The indoor unit according to any one of claims 1 to 8, wherein the distance between the centrifugal fan and the apex is shorter than the distance between the centrifugal fan and the heat exchanger.
The indoor unit according to any one of claims 1 to 9, wherein a slit is provided in the partition plate.
The indoor unit according to any one of claims 1 to 10 and the indoor unit.
An air conditioner including an outdoor unit connected to the indoor unit.