JP2004060622A - Centrifugal blower and air conditioner using sirocco centrifugal fan rotor - Google Patents

Abstract

Provided is a centrifugal blower that can discharge air over the entire circumference in a centrifugal direction while securing a static pressure while using a multi-blade (sirocco-type) centrifugal fan rotor having blades facing forward in the rotation direction. .
A centrifugal blower includes a multi-blade fan rotor (50) and an annular diffuser (70). The diffuser 70 is arranged on the outer peripheral side of the multi-blade fan rotor 50.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a centrifugal blower and an air conditioner, and more particularly to a centrifugal blower and an air conditioner provided with a sirocco centrifugal fan rotor.
[0002]
[Prior art]
An air conditioner mainly includes an outdoor unit having a compressor, a heat exchanger, and the like, and an indoor unit having a centrifugal blower and a heat exchanger. As indoor units, various types of indoor units such as a wall-mounted type, a ceiling-buried type, and a ceiling suspended type are provided.
For example, the ceiling-embedded indoor unit has the appearance shown in FIG. 1, and includes a substantially rectangular parallelepiped casing 11, a turbofan 17, and a heat exchanger 80 as shown in FIG. 2. . In the casing 11, a suction port 20 is formed at the center of the bottom, and four air outlets 21 are formed on the outer peripheral side of the suction port 20 so as to correspond to each side of the rectangle. A bell mouth 18 is disposed inside the casing 11 corresponding to the suction port 20, and a turbo fan 17 for sucking air from the suction port 20 and blowing air to the side is disposed above the bell mouth 18. . A cross-fin type heat exchanger 80 is arranged between the turbo fan 17 and the air outlet 21 so as to heat-exchange the air blown from the turbo fan 17 so as to surround the turbo fan 17 (see FIG. 1). (See FIG. 3).
[0003]
When the turbo fan 17 is rotated, indoor air is drawn into the interior of the indoor unit 1 from the suction port 20 as shown by an arrow W in FIG. The sucked air is blown to the outer peripheral side of the turbo fan 17 as shown by an arrow X in FIG. The air blown to the outer peripheral side of the turbo fan 17 is heat-exchanged by a heat exchanger 80 disposed on the outer peripheral side of the turbo fan 17 as shown by an arrow Y, and is provided at an outlet provided at the bottom of the casing 11. It is blown into the room from 21.
[0004]
[Problems to be solved by the invention]
When it is necessary to send out the taken-in air substantially uniformly in the centrifugal direction over the entire circumference as in the indoor unit 1 described above, a turbo fan whose blades are curved backward in the rotational direction is often used.
However, recently, in order to reduce the size of the indoor unit, it is required to reduce the diameter of the blower of the indoor unit. Here, if the diameter of the turbofan is simply reduced, the static pressure is also reduced, so that an alternative is required. Therefore, a sirocco fan that has a higher static pressure than a turbo fan when compared at the same diameter can be given as a candidate for a substitute, but as shown in FIG. 4, the sirocco fan 41 collects dynamic pressure. Therefore, it is necessary to provide a spiral scroll casing 60. In other words, the conventional sirocco fan does not have a structure in which air is discharged over the entire circumference in the centrifugal direction, as is apparent from the flow of air indicated by the one-dot chain line arrow F1 in FIG.
[0005]
An object of the present invention is to provide a centrifugal blower that can discharge air over the entire circumference in the centrifugal direction while securing a static pressure while using a multi-blade (sirocco type) centrifugal fan rotor having blades facing forward in the rotation direction. Is to provide.
[0006]
[Means for Solving the Problems]
The centrifugal blower according to claim 1 includes a sirocco centrifugal fan rotor and an annular diffuser. The diffuser is arranged on the outer peripheral side of the sirocco centrifugal fan rotor.
Conventionally, static pressure is secured by collecting air having a large dynamic pressure portion discharged in the centrifugal direction from a sirocco centrifugal fan rotor in one direction by a scroll casing.
[0007]
On the other hand, in the centrifugal blower according to the first aspect, the static pressure is ensured by passing the air discharged from the sirocco-type centrifugal fan rotor through an annular diffuser surrounding the outer periphery of the sirocco-type centrifugal fan rotor. The blown air is discharged from the annular diffuser over substantially the entire circumference in the centrifugal direction. Therefore, when such characteristics are required, a turbofan or the like conventionally used is replaced according to the present invention. You can use a centrifugal blower.
[0008]
A centrifugal blower according to a second aspect is the centrifugal blower according to the first aspect, wherein air is blown from the diffuser all around.
The centrifugal blower according to claim 3 is the centrifugal blower according to claim 1 or 2, wherein the heat exchanger is annularly arranged on an outer peripheral side of the sirocco-type centrifugal fan rotor, wherein the diffuser is formed by fins of the heat exchanger. It is formed.
[0009]
2. Description of the Related Art In an air conditioner or the like, a heat exchanger may be conventionally arranged to surround a turbo fan or the like that discharges air over the entire circumference in a centrifugal direction. The role of a turbofan or the like and the role of a heat exchanger are different from each other, and they do not particularly have a unity.
On the other hand, the centrifugal blower according to the present invention uses the heat exchanger annularly arranged on the outer peripheral side of the sirocco type centrifugal fan rotor for its own role, and uses the fins of the heat exchanger as a diffuser. To make it work. That is, the fins of the heat exchanger serve not only to improve the heat exchange efficiency of the heat exchanger, but also serve to secure the static pressure of the centrifugal blower. By making the fins of the heat exchanger also serve as the diffuser of the centrifugal blower, the occupied space when the centrifugal blower and the heat exchanger are considered as one can be reduced, and the centrifugal blower and the heat exchanger can be reduced. It is possible to reduce the size of devices such as an air conditioner equipped with the device.
[0010]
An air conditioner according to a fourth aspect includes a sirocco centrifugal fan rotor and a heat exchanger. The heat exchanger is annularly arranged on the outer peripheral side of the sirocco centrifugal fan rotor, and has a heat transfer tube through which a refrigerant flows, and a plurality of fins mounted on the heat transfer tube. The plurality of fins of the heat exchanger function as a diffuser on the outer peripheral side of the sirocco centrifugal fan rotor.
[0011]
In some conventional air conditioners, a heat exchanger is disposed so as to surround a turbofan that discharges air over the entire circumference in a centrifugal direction. The role of the turbofan and the role of the heat exchanger are different from each other, and they are not particularly integrated.
On the other hand, the air conditioner of the present invention uses a heat exchanger annularly arranged on the outer peripheral side of the sirocco-type centrifugal fan rotor to reduce the dynamic pressure portion of the air discharged from the sirocco-type centrifugal fan rotor. It has a configuration to collect. That is, here, the arrangement is such that the fins of the heat exchanger act as a diffuser on the outer peripheral side of the sirocco centrifugal fan rotor. By making the fins of the heat exchanger also serve as the diffuser of the centrifugal blower, the size of the air conditioner can be reduced as compared with a combination of a centrifugal blower with a separate diffuser and a heat exchanger. Become like
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
<Structure>
The centrifugal blower 42 according to one embodiment of the present invention is shown in FIG. 6 and is a scrollless sirocco fan with a diffuser. The centrifugal blower 42 includes a multi-blade fan rotor 50 having forward inclined blades, and an annular diffuser 70 disposed therearound.
[0013]
The multi-blade fan rotor 50 is equivalent to that used in a conventional sirocco fan, and is a sirocco centrifugal fan rotor having a plurality of forward inclined blades (blades inclined forward in the rotation direction). As shown in FIG. 5, the multi-blade fan rotor 50 includes a main plate 51, a ring member 52, and a plurality of blades 53. The main plate 51 has a circular shape and is rotated by a motor (not shown). The main plate 51 is provided with a center hole 51a, and a rotating shaft of a motor is mounted in the center hole 51a. The plurality of blades 53 are annularly arranged at equal intervals, and extend along the rotation axis. One end of each wing 53 is fixed to an outer peripheral portion of the main plate 51. The ring member 52 is an annular member and has an inner diameter that is the same as or slightly larger than the outer diameter of the main plate 51. This ring member 52 is connected to the outer peripheral edges of the wings 53 at the other ends of the plurality of wings 53.
[0014]
As shown in FIG. 6, the diffuser 70 is an annular member arranged to surround the outer periphery of the multi-blade fan rotor 50, and includes a substrate 71, a blade member 72, and a ring member 73. One end of the plurality of blade members 72 is fixed to the substrate 71, extends parallel to the rotation axis of the multi-blade fan rotor 50, and the outer peripheral portion of the other end is integrated by a ring member 73. The diffuser 70 is provided to recover the kinetic energy of the air flowing out of the multi-blade fan rotor 50 as pressure energy. It is sent out over the entire circumference in the centrifugal direction (see the arrow F2 indicated by the one-dot line in FIG. 6). That is, in the centrifugal blower 42, air is blown from the diffuser 70 all around.
[0015]
<Features>
Conventionally, as shown in FIG. 4, static pressure is ensured by collecting air having a large dynamic pressure portion discharged in a centrifugal direction from a multi-blade fan rotor 50 in one direction by a scroll casing 60.
On the other hand, in the centrifugal blower 42 of the present embodiment, the static pressure is secured by passing the air discharged from the multi-blade fan rotor 50 through the annular diffuser 70 surrounding the outer periphery of the multi-blade fan rotor 50. . The blown air is discharged from the annular diffuser 70 in the centrifugal direction over substantially the entire circumference. Therefore, when such characteristics are required, a turbo fan or the like which has been conventionally used is replaced by a turbo fan or the like which has been conventionally used. The centrifugal blower 42 can be used.
[0016]
[Second embodiment]
<Structure>
An indoor unit of an air conditioner according to an embodiment of the present invention is the same as the indoor unit 1 shown in FIGS. 1 to 3 described in the section of “Conventional Technology”, except that the turbo fan 17 and the heat exchanger 80 are used. Thus, a centrifugal blower 43 with a heat exchanger shown in FIG. 7 is employed.
[0017]
The centrifugal blower 43 with a heat exchanger plays both the role of the conventional fan 17 and the role of the heat exchanger 80, and includes a multi-blade fan rotor 50, heat transfer tubes 91 and 92, and fins 93. I have. The multi-blade fan rotor 50 is the same as that shown in FIG. 5 described in the first embodiment. The heat transfer tubes 91 and 92 are provided in one of four corners (a lower left corner of FIG. 7) of a casing 111 (equivalent to the conventional casing 11 shown in FIG. 2 and the like) for a refrigerant pipe. Is connected to a refrigerant pipe extending from an outdoor unit (not shown). These heat transfer tubes 91 and 92 are annularly arranged on the outer peripheral side of the multi-blade fan rotor 50 so as to surround the multi-blade fan rotor 50. Many fins 93 are arranged along the annular heat transfer tubes 91 and 92. The fin 93 is a thin plate member made of metal such as aluminum, and has a hole through which the heat transfer tubes 91 and 92 are inserted.
[0018]
In the centrifugal blower 43 with the heat exchanger, the part that plays the role of the centrifugal blower is the multi-blade fan rotor 50 and the fins 93 around which a large number are arranged in a ring. Here, the fins 93 serve to convert the kinetic energy of air radially discharged from the multi-blade fan rotor 50 into a pressure gradient to secure a predetermined static pressure.
In the centrifugal blower 43 with a heat exchanger, portions that function as heat exchangers are the heat transfer tubes 91 and 92 and the fins 93. Here, the fins 93 serve to improve the efficiency of heat exchange between the refrigerant flowing inside the heat transfer tubes 91 and 92 and the air flowing around the heat transfer tubes 91 and 92 by increasing the heat transfer area. As described above, the heat transfer tubes 91 and 92 and the fins 93 serve as a heat exchanger 90 in the centrifugal blower 43 with a heat exchanger.
[0019]
<Features>
2. Description of the Related Art In an air conditioner, a heat exchanger may be conventionally arranged to surround a turbo fan that discharges air over the entire circumference in a centrifugal direction (the structure of a conventional indoor unit shown in FIGS. 2 and 3). See). The role of the turbofan and the role of the heat exchanger are different from each other, and they are not particularly integrated.
[0020]
On the other hand, the centrifugal blower 43 of the present embodiment uses the heat exchanger 90 annularly arranged on the outer peripheral side of the multi-blade fan rotor 50 to generate a dynamic pressure portion of the air discharged from the multi-blade fan rotor 50. Is collected. That is, here, an arrangement is adopted in which the fins 93 of the heat exchanger 90 act as a diffuser on the outer peripheral side of the multi-blade fan rotor 50. By making the fins 93 of the heat exchanger 90 also serve as the diffuser of the centrifugal blower, the size of the indoor unit of the air conditioner can be reduced as compared with a combination of a centrifugal blower with a separate diffuser and a heat exchanger. Can be achieved.
[0021]
【The invention's effect】
In the centrifugal blower according to the first or second aspect, the air discharged from the sirocco-type centrifugal fan rotor passes through an annular diffuser surrounding the outer periphery of the sirocco-type centrifugal fan rotor, thereby ensuring a static pressure. The blown air is discharged from the annular diffuser over substantially the entire circumference in the centrifugal direction. Therefore, when such characteristics are required, a turbofan or the like conventionally used is replaced according to the present invention. You can use a centrifugal blower.
[0022]
In the centrifugal blower according to the third aspect, a heat exchanger annularly arranged on the outer peripheral side of the sirocco-type centrifugal fan rotor is used for its own role, and the fins of the heat exchanger act as a diffuser. I have to. That is, the fins of the heat exchanger serve not only to improve the heat exchange efficiency of the heat exchanger, but also serve to secure the static pressure of the centrifugal blower. By making the fins of the heat exchanger also serve as the diffuser of the centrifugal blower, the occupied space when the centrifugal blower and the heat exchanger are considered as a single unit can be reduced, and the centrifugal blower and the heat exchanger can be reduced. It is possible to reduce the size of devices such as an air conditioner equipped with the device.
[0023]
In the air conditioner according to the fourth aspect, the dynamic pressure portion of the air discharged from the sirocco-type centrifugal fan rotor is recovered using a heat exchanger annularly arranged on the outer peripheral side of the sirocco-type centrifugal fan rotor. Has been adopted. That is, here, the arrangement is such that the fins of the heat exchanger act as a diffuser on the outer peripheral side of the sirocco centrifugal fan rotor. By making the fins of the heat exchanger also serve as the diffuser of the centrifugal blower, the size of the air conditioner can be reduced as compared with a combination of a centrifugal blower with a separate diffuser and a heat exchanger. Become like
[Brief description of the drawings]
FIG. 1 is an external perspective view of an indoor unit of an air conditioner.
FIG. 2 is a longitudinal sectional view of a conventional indoor unit.
FIG. 3 is a plan layout view of a conventional heat exchanger of an indoor unit.
FIG. 4 is a schematic view of a conventional sirocco fan with a scroll casing.
FIG. 5 is a plan view of a multi-blade fan rotor.
FIG. 6 is a plan view of a scrollless sirocco fan with a diffuser according to the first embodiment of the present invention.
FIG. 7 is a plan view of an indoor unit of an air conditioner according to a second embodiment of the present invention.
[Explanation of symbols]
1 indoor unit 42 of air conditioner centrifugal blower 43 centrifugal blower with heat exchanger (centrifugal blower)
50 Multiblade fan rotor (Sirocco centrifugal fan rotor)
70 diffuser 90 heat exchanger 91, 92 heat transfer tube 93 fin

Claims (4)

A sirocco centrifugal fan rotor (50);
An annular diffuser (70) arranged on the outer peripheral side of the sirocco centrifugal fan rotor;
A centrifugal blower (42) comprising: Air is blown from the diffuser (70) all around.
The centrifugal blower (42) according to claim 1. The diffuser is formed by fins (93) of a heat exchanger annularly arranged on the outer peripheral side of the sirocco centrifugal fan rotor (50).
A centrifugal blower (43) according to claim 1 or 2. A sirocco centrifugal fan rotor (50);
The sirocco centrifugal fan rotor (50) has heat transfer tubes (91, 92) through which a refrigerant flows, and a plurality of fins (93) mounted on the heat transfer tubes. A heat exchanger (90);
With
A plurality of fins (93) of the heat exchanger serving as a diffuser on an outer peripheral side of the sirocco centrifugal fan rotor (50);
Air conditioner.

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