JP2002147789A - Indoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the indoor unit of an air conditioner which can lower noises and vibration. SOLUTION: The occurrence of a vortex is suppressed and besides the elevation of the rigidity of a roof is enabled by providing the roof of a cabinet with a rib which goes along the flow of air from a suction and sending device to the blowout port of an indoor unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to increasing the rigidity of a cabinet of an indoor unit of an air conditioner, and providing a top plate for supporting a suction device with ribs in a direction along the flow of air. The present invention relates to an indoor unit of an air conditioner in which the generation of vortices is reduced, thereby reducing vibration and noise.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 7-139 discloses a method for increasing the rigidity of an indoor unit cabinet of an air conditioner, that is, reducing the vibration.
No. 753 (hereinafter referred to as “first conventional example”) and Japanese Patent Laid-Open No. 8-75239 (hereinafter referred to as “second conventional example”)
Can be cited.

[0003] In the first conventional example, air provided with a cabinet having a top plate for supporting a suction device and a heat exchanger, and a side plate extending substantially orthogonally from the top plate and provided with a hanging bracket mounting portion is provided. In the indoor unit of the harmony device, an example is disclosed in which a rising portion that increases the bending rigidity of the top plate and the side plate is provided in a portion from the support position of the suction device supported by the top plate to the mounting portion of the side plate. I have.

[0004] On the other hand, a second conventional example discloses an example in which stiffness and rectification are made possible by employing an integrally molded dome type cabinet.

[0005]

SUMMARY OF THE INVENTION A suction device comprising a centrifugal fan having a number of blades provided between a hub and a shroud, and a fan motor for driving the centrifugal fan to rotate, and a suction passage in the air passage of the suction device. In an indoor unit of an air conditioner having a cabinet that includes a top plate that supports a heat exchanger to be provided and a side plate that forms a ventilation flow path to the indoor unit outlet with the top plate, the top plate includes Since the suction device and the heat exchanger are vertically supported on the lower surface, bending of the central portion of the top plate becomes a problem. In general, the suction device, which is the vibration source, is often installed in the center of the top plate, so it is very important to increase the rigidity and avoid resonance of the cabinet to reduce the vibration of the indoor unit. is there.

As a method of increasing the rigidity, there are measures such as increasing the thickness of the plate and providing a reinforcing member. However, there are problems such as a decrease in installation efficiency due to an increase in product weight and an increase in parts and manufacturing costs. In many cases, unevenness such as a bent structure of a plate material or a rib is provided on a top plate and a side plate.

However, as in the first conventional example shown in FIG. 15, even if the top plate is provided with the uneven ribs 101h from the viewpoint of simply increasing the rigidity in the vicinity of the suction device of the top plate, the air can be removed. Since the flow 700 is disturbed and the vortex 703 is generated, the blowing noise is rather increased. On the other hand, when the cabinet is dome-shaped as in the second conventional example, there arise problems that the production cost increases and the space efficiency is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an indoor unit of an air conditioner capable of reducing noise and vibration.

[0009]

In order to achieve the above object, an indoor unit of an air conditioner according to the present invention is characterized by what is described in each claim.

That is, an air conditioner indoor unit according to a first aspect of the present invention is a centrifugal fan having a large number of blades provided between a hub and a shroud, and rotationally drives the centrifugal fan. A suction device including a fan motor, a heat exchanger surrounding the suction device and disposed in an air passage thereof, and the suction device and the heat exchanger including a top plate and four side plates; A cabinet which is mounted on the lower surface of the top plate and accommodates the cabinet, wherein a circumferential flow region is formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate opposed thereto; In the indoor unit of an air conditioner having a deviated radiation direction flow region formed on the bottom surface of the top plate on the outside of the top plate, at least the circumferential flow region in the top plate aims at rectification of the circumferential flow, and , High rigidity of the top plate In which characterized in that a multi-annular rib or multiple spiral ribs for achieving of.

An indoor unit for an air conditioner according to a second aspect of the present invention is a centrifugal fan having a number of blades provided between a hub and a shroud, and rotationally drives the centrifugal fan. A suction device including a fan motor, a heat exchanger surrounding the suction device and disposed in an air passage thereof, and the suction device and the heat exchanger including a top plate and four side plates; A cabinet which is mounted on the lower surface of the top plate and accommodates the cabinet, wherein a circumferential flow region is formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate opposed thereto; In the indoor unit of an air conditioner having an oblique radiation direction flow region formed on the bottom surface of the top plate on the outside of the top plate, at least the oblique radiation direction flow region of the top plate is designed to rectify the oblique radiation direction flow. And the top plate It is characterized in that provided at least three or more polarized radiation ribs for achieving high rigidity.

An air conditioner indoor unit according to a third aspect of the present invention is a centrifugal fan having a number of blades provided between a hub and a shroud, and rotationally drives the centrifugal fan. A suction device including a fan motor, a heat exchanger surrounding the suction device and disposed in an air passage thereof, and the suction device and the heat exchanger including a top plate and four side plates; A cabinet which is mounted on the lower surface of the top plate and accommodates the cabinet, wherein a circumferential flow region is formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate opposed thereto; In the indoor unit of an air conditioner having a deviated radiation direction flow region formed on the bottom surface of the top plate on the outside of the top plate, at least the circumferential flow region in the top plate aims at rectification of the circumferential flow, and , Making the top plate rigid A plurality of annular ribs or a plurality of spiral ribs are provided for the purpose of rectification of the flow in the obliquely radiating direction and at least the rigidity of the top plate. Characterized in that at least three or more polarized radiation ribs are provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 show a first embodiment of an indoor unit of an air conditioner according to the present invention. FIG. 1 is a perspective view of the indoor unit, and FIG. FIG. In these figures, the cabinet 100 forms the outer shape of the indoor unit.

The cabinet 100 is composed of a top plate 101 and four side plates 102 each made of a plate material.
At the lower end of the side plate 102, a panel 400 provided at an opening of a ceiling (not shown) is provided.

The suction device 200 has a hub 201b having a center portion fixed to a motor drive shaft and a fan suction opening 20 at a center portion.
A fan 201 having a large number of fan blades 201a provided between a shroud 201c having an outer periphery 1d and a fan delivery opening 201e formed on the entire periphery and a fan motor 202 for rotating the fan 201a. Is attached to and supported by the suction device mounting portion 103 located at the position shown in FIG.
A heat exchanger 300 is provided around the suction device 200 so as to surround the suction device 200, and the heat exchanger 300 is also supported by the top plate 101. A water receiver 301 is provided at the bottom of the heat exchanger 300.

As shown in FIG. 2, the air flow 700 generated by the suction device 200 is such that air is sucked by a fan 201 from a suction port 401 provided at the center of the panel 400, and heat is sequentially exchanged. After passing through the container 300 and the side plate 102, the air is blown out from an air outlet 402 formed in the outer peripheral portion of the panel 400. The indoor unit is a side plate 102
Is hung on a ceiling (not shown) by a hanging bracket 501 and a hanging bolt 502 provided in the ceiling. The indoor unit is installed in the ceiling, and only panel 400 is exposed to the indoor side. Multiple annular rib 1 which is a feature of the present invention.
01 a is provided on the top plate 101.

Next, a detailed configuration of the top plate 101 will be described.

FIG. 3 shows the flow of air 700 around the fan 201 and the heat exchanger 300 as viewed from B in FIG. In this figure, the same reference numerals as those in FIG. 2 denote the same parts. A circumferential flow region of air having only a circumferential flow 701 flowing in the same direction as the rotation direction 201f of the fan is formed between the upper surface of the outer peripheral portion of the hub 201b of the fan 201 and the lower surface of the top plate 101 opposed thereto. .
On the other hand, around the fan 201, the circumferential flow 701
And the radial flow 702 flowing in the radial direction of the fan 201 to form a deviated radial flow region of air outside the circumferential flow region and on the lower surface of the top plate 101.

FIG. 4 shows that the multiple annular ribs 101a provided on the top plate 101 of FIG. 1 are formed as continuous wavy ribs on the upper and lower surfaces of the top plate. The multi-annular rib 101a has a circumferential flow 7
By continuously arranging concentric circles along the line 01, the generation of vortices is suppressed and the rigidity of the central portion of the top plate 101 is increased.
That is, the flow in the circumferential direction is rectified at least in the circumferential flow region. The cross-sectional shape of the rib may be any one of a circle 601, a triangle 602, and a square 603.

As a second embodiment of the indoor unit of the present invention, instead of the multiple annular rib 101a, a structure such as a multiple spiral rib 101b as shown in FIG. Similarly, generation of a vortex can be suppressed, and the rigidity of the top plate 101 can be increased.

FIG. 6 shows a third embodiment of the indoor unit according to the present invention. In FIG. 6, the same reference numerals as in FIG. 4 denote the same parts. Multiple annular rib 101 in the first embodiment
The gap between the ribs a is provided, which is convenient when it is difficult to provide the continuous corrugated rib due to a problem in production technology. Also, the rib interval 101 of the multiple annular rib
d need not necessarily be equally spaced. Even with such a structure, the generation of vortices can be suppressed and the rigidity of the top plate 101 can be increased as in the first embodiment. The cross-sectional shape of the rib is circular 601, triangle 602, or square 603.
Either may be used.

FIG. 7 shows a fourth embodiment of the indoor unit according to the present invention, and shows the shape of a polarized radiation rib 101c provided on the top plate 101 and having an angle with respect to the radial direction. .
In this figure, the same reference numerals as those in FIG. 1 denote the same parts. The polarized radiation rib 101c is provided with at least three or more ribs in the direction of the polarized radiation angle θ with respect to the radial direction from the suction device mounting portion 103 toward the outer periphery. Top plate 101
In at least the flow region in the polarized radiation direction, the flow in the polarized radiation direction is rectified, and the rigidity of the top plate 101 is increased. The cross-sectional shape of the rib may be any one of a circle 601, a triangle 602, and a square 603.

The polarization angle θ will be further described. FIG. 8 shows the flow of air 700 around the fan 201 and the heat exchanger 300 as viewed from B in FIG. 2, and the same reference numerals in FIG. 8 denote the same parts as in FIG. Is determined by a velocity triangle obtained by combining the circumferential flow 701 and the radial flow 702. The polarized radiation rib 101c is a particularly effective rib shape when the emphasis is placed on the radial flow 702.

FIGS. 9 and 10 show a fifth embodiment of the indoor unit of the present invention.
FIG. 9 is a top view of an indoor unit, and FIG.
0 is a DD sectional view of FIG. In these figures, the same reference numerals as those in FIG. 2 denote the same parts. In the present embodiment, the multiple annular ribs 101a with emphasis on the circumferential flow 701
Is provided substantially to the vicinity of the outer periphery of the fan 201, and the fan 201
From the outer circumference of the radiating rib 1 considering the radial flow 702
01c.

The fan 20 in which the circumferential flow 701 is the main flow
In the inner region of the hub 201b, that is, in the circumferential flow region, the multiple annular ribs 101a are provided. In the outer region of the hub 201b of the fan 201, in which the radial flow 702 is large, that is, in the radial flow region, the polarized ribs 101c are provided. By dividing the area into two or more areas and providing the ribs along the respective air flows 700, the noise can be further reduced, and the top plate 101 can be reduced compared to the case where only the multiple annular ribs 101a are provided. Higher rigidity is possible. The cross-sectional shape of the rib may be any one of a circle 601, a triangle 602, and a square 603, and the cross-sectional shape and the size of each of the multiple annular rib 101a and the polarized radiation rib 101c are not necessarily the same.

FIG. 11 shows a sixth embodiment of the indoor unit according to the present invention, in which the same reference numerals as in FIG. 10 denote the same parts. Multiple annular ribs 101a are provided in the circumferential flow region so as not to intersect with the polarized radiation rib 101c between the ribs of the polarized radiation rib 101c provided from the circumferential flow region to the polarized radiation direction flow region. Polarized radiation rib 1
01c alone is also effective when the rigidity of the top plate 101 is insufficient. Even with such a structure, noise reduction and vibration reduction can be achieved as in the above-described embodiment. In addition,
The cross-sectional shape of the rib may be any one of a circular shape 601, a triangular shape 602, and a rectangular shape 603.
The cross-sectional shape and the size of each of the polarization radiating ribs 101c need not necessarily be the same as each other.

FIG. 12 shows a seventh embodiment of the indoor unit according to the present invention. In FIG. 12, the same reference numerals as those in FIG. 10 denote the same parts. Polarized radiation rib 10 in the sixth embodiment
1c and the multiple annular ribs 101a are overlapped so as to intersect with each other to form a continuous integral rib. Providing a continuous space between the ribs is effective when it is desired to further increase the rigidity of the top plate 101. Even with such a structure, noise reduction and vibration reduction can be achieved as in the above-described embodiment. The cross-sectional shape of the rib may be any one of a circle 601, a triangle 602, and a square 603, and the cross-sectional shape and the size of each of the multiple annular rib 101a and the polarized radiation rib 101c are not necessarily the same.

FIG. 13 is an enlarged sectional view of a portion E in FIG. 10, showing an eighth embodiment of the indoor unit according to the present invention. In this figure, the same reference numerals as those in FIG. 10 denote the same parts. . The distance 101g between the tip of the polarized radiation rib and the outer edge of the top plate is made as small as possible, that is, the rib is connected to the outer edge 101f of the top plate. Even with such a structure, noise reduction and vibration reduction can be achieved as in the above-described embodiment. Further, as compared with the embodiment described above, the cabinet 100
Rigidity can be increased. The cross-sectional shape of the rib may be any one of a circle 601, a triangle 602, and a square 603.

FIG. 14 is an enlarged sectional view of a portion E in FIG. 10 and shows a ninth embodiment of the indoor unit of the present invention. In FIG. 14, the same reference numerals as those in FIG. 10 denote the same parts. . The polarized radiation rib tip 101e is provided with a continuous rib that passes through the top plate outer edge 101f and reaches the side plate 102 as well. Even with such a structure, noise reduction and vibration reduction can be achieved as in the above-described embodiment. Further, the rigidity of the cabinet 100 can be increased as compared with the embodiment described above. The cross-sectional shape of the rib is circular 60.
1, any of a triangle 602 and a square 603 may be used.

[0031]

According to the first aspect of the present invention, by providing ribs that match the circumferential flow region, it is possible to suppress the generation of vortices and to provide a cabinet having high rigidity, thereby reducing the noise of the indoor unit. This is effective in reducing vibration.

According to the second aspect of the present invention, by providing a rib that matches the flow region in the deviated radiation direction, it is possible to suppress the generation of vortices and to provide a highly rigid cabinet. Effective for lowering vibration.

According to the third aspect of the present invention, the provision of the ribs respectively corresponding to the circumferential flow region and the radial radiation flow region can suppress generation of vortices and provide a cabinet having high rigidity. This is effective in reducing noise and vibration of the machine.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of an indoor unit of an air conditioner of the present invention.

FIG. 2 is a diagram illustrating a first embodiment of the indoor unit of the present invention shown in FIG. 1;
It is -A sectional drawing.

FIG. 3 is a view B of the first embodiment of the indoor unit of the present invention shown in FIG. 2;
FIG. 4 is a plan view showing a state of a flow around a fan and a heat exchanger as viewed from above.

FIG. 4 is a perspective view of a cross section showing the first embodiment of the indoor unit of the present invention.

FIG. 5 is a perspective view showing a second embodiment of the indoor unit of the present invention.

FIG. 6 is a perspective view of a cross section showing a third embodiment of the indoor unit of the present invention.

FIG. 7 is a perspective view showing a fourth embodiment of the indoor unit of the present invention.

FIG. 8 is a plan view showing a state of a flow of air around a fan and a heat exchanger of the indoor unit of the present invention.

FIG. 9 is a top view showing a fifth embodiment of the indoor unit of the present invention.

FIG. 10 is a sectional view taken along line DD of the fifth embodiment of the indoor unit of the present invention shown in FIG.

FIG. 11 is a top view showing a sixth embodiment of the indoor unit of the present invention.

FIG. 12 is a top view showing a seventh embodiment of the indoor unit of the present invention.

FIG. 13 shows an eighth embodiment of the indoor unit of the present invention.
3 is an enlarged sectional view of a portion E shown in FIG.

FIG. 14 shows a ninth embodiment of the indoor unit of the present invention.
3 is an enlarged sectional view of a portion E shown in FIG.

FIG. 15 is a diagram showing a state of generation of a vortex around a top plate unevenness, which is a problem of the indoor unit of the conventional air conditioner.

[Explanation of symbols]

 Reference Signs List 100 cabinet 101 top plate 101a multiple annular ribs 101b multiple spiral ribs 101c polarized radiation ribs 101d rib spacing of multiple annular ribs 101e polarized radiation rib tips 101f top edge 101g polarized radiation rib tips and ceiling Distance from the outer edge of the plate 101h ... uneven ribs 102 ... side plate 200 ... suction device 201 ... fan 201a ... fan blade 201b ... hub 201c ... shroud 201d ... fan suction opening 201e ... fan delivery opening 201f ... fan rotation direction 202 ... Fan motor 300 ... Heat exchanger 301 ... Water receiver 400 ... Panel 401 ... Suction port 402 ... Outlet 501 ... Hanging bracket 502 ... Hanging bolt 601 ... Circular 602 ... Triangle 603 ... Square 700 ... Air flow 701 ... Circumferential flow 702 ... radial flow 703 ... vortex θ ... polarized radiation Degree

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04D 29/42 F04D 29/42 M 29/66 29/66 N (72) Inventor Hiroyasu Yoneyama Shimizu, Shizuoka 390 Muramatsu Hitachi Shimizu Engineering Co., Ltd. (72) Inventor Tetsushi Kishitani 390 Muramatsu, Shimizu-shi, Shizuoka Pref.Hitachi Air Conditioning Systems Co., Ltd. Hitachi Air Conditioning System Shimizu Production Headquarters (72) Inventor Reiko Yamauchi 390 Muramatsu, Shimizu Ichizu Shizuoka Prefecture Inside Hitachi Shimizu Engineering Co., Ltd. F term (reference) 3H034 AA02 AA18 BB02 BB06 BB16 BB19 CC03 DD01 EE06 EE11 3H035 DD04 DD05 3L04 9 BA03 BB07 BB10 BC03 BD01 3L051 BG06

Claims (6)

[Claims] 1. A centrifugal fan having a large number of blades provided between a hub and a shroud, a suction device including a fan motor for rotating the centrifugal fan, and a suction passage surrounding the suction device and having an air passage therethrough. A heat exchanger, and a cabinet comprising a top plate and a four-sided side plate, which is provided with the suction device and the heat exchanger attached to the lower surface of the top plate and accommodated therein,
A circumferential flow region formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate facing the hub, and a radial radiation direction flow region formed on the lower surface of the top plate outside the circumferential flow region. In the indoor unit of the air conditioner having, at least the circumferential flow region in the top plate,
An indoor unit for an air conditioner, comprising a plurality of annular ribs or a plurality of spiral ribs for rectifying the circumferential flow and for increasing the rigidity of the top plate. 2. A suction device comprising a centrifugal fan having a large number of blades provided between a hub and a shroud, and a fan motor for rotating and driving the centrifugal fan. A heat exchanger, and a cabinet comprising a top plate and a four-sided side plate, which is provided with the suction device and the heat exchanger attached to the lower surface of the top plate and accommodated therein,
A circumferential flow region formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate facing the hub, and a radial radiation direction flow region formed on the lower surface of the top plate outside the circumferential flow region. In the indoor unit of the air conditioner having at least three radially directional flow regions in the top plate, at least three of which are used to rectify the radially directional flow and increase the rigidity of the top plate. An indoor unit for an air conditioner, comprising at least one polarized radiation rib. 3. A suction device comprising a centrifugal fan having a number of blades provided between a hub and a shroud, and a fan motor for rotating and driving the centrifugal fan, and a suction device surrounding the suction device and having an air passage therethrough. A heat exchanger, and a cabinet comprising a top plate and a four-sided side plate, which is provided with the suction device and the heat exchanger attached to the lower surface of the top plate and accommodated therein,
A circumferential flow region formed between the upper surface of the outer peripheral portion of the hub of the centrifugal fan and the lower surface of the top plate facing the hub, and a radial radiation direction flow region formed on the lower surface of the top plate outside the circumferential flow region. In the indoor unit of the air conditioner having, at least the circumferential flow region in the top plate,
A plurality of annular ribs or a plurality of spiral ribs for rectifying the circumferential flow and increasing the rigidity of the top plate are provided. An indoor unit for an air conditioner, wherein at least three or more polarized radiation ribs are provided for rectifying the flow and increasing the rigidity of the top plate. 4. The circumferential flow in the top plate between each of at least three or more of the radial radiation ribs provided from the circumferential flow region to the radial flow region in the top plate. The indoor unit of an air conditioner according to claim 3, wherein the multiple annular ribs or the multiple spiral ribs are provided in a region so as not to intersect with the polarized radiation ribs. 5. The circumferential flow in the top plate between at least three or more of the radial radiation ribs provided from the circumferential flow region to the radial flow region in the top plate. The indoor unit for an air conditioner according to claim 3, wherein the multiple annular ribs or the multiple spiral ribs are provided in a region so as to intersect with the partial radiation ribs. 6. The apparatus according to claim 2, wherein at least three or more of the deflected ribs provided on the top plate are continuously provided near an outer edge of the top plate or up to the side plate. An indoor unit of the air conditioner according to item 1.