JPH11159975A - Heat exchanger using centrifugal blasting means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger using a centrifugal blasting means wherein noise is reduced and a desired supply air volume is obtained. SOLUTION: A case 22 of an indoor unit 1 is provided with an impeller 2 which rotates around a spindle 5. The impeller 2 is provided with a hub 6 where rotative driving force is transferred. A ring-like shroud 4 is so provided as to face the hub 6. A heat exchanging part 12 is so provided as to enclose the impeller 2 circumferentially. Each fin 14 of the heat exchanging part 12 is allocated in the direction across the spindle 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger using a centrifugal blower, and more particularly to a heat exchanger in which the generation of noise is suppressed.
The present invention relates to a heat exchanger using a centrifugal blower in which pressure loss is reduced.

[0002]

2. Description of the Related Art In air conditioners and the like, various blowers are used to perform heat exchange by sending air into a heat exchanger. One such blower is a centrifugal fan. Therefore, a conventional heat exchanger using a centrifugal fan will be described with reference to FIG. The heat exchanger shown in FIG. 7 is a portion corresponding to an indoor unit of a so-called separator type room air conditioner.

The indoor unit 1 is connected to an outdoor unit (not shown) to form a series of a cooling cycle or a heating cycle. In the housing 22 of the indoor unit 1,
An impeller 2 is provided which is rotated around a rotation shaft 5 by a rotation driving means (not shown). The impeller 2 has a hub 6 to which a rotational driving force is transmitted by a rotating shaft 5.
The air intake 1 is located near the center so as to face the hub 6.
A ring-shaped shroud 4 having an opening 0 is provided. At an outer peripheral portion between the shroud 4 and the hub 6, a plurality of blower blades 8 arranged at predetermined intervals in a circumferential direction are provided. The centrifugal fan including the impeller 2 and the rotation driving means is referred to as a centrifugal fan.

[0004] A heat exchange section 13 is provided so as to surround the impeller 2 in the circumferential direction. The heat exchange section 13 is provided with a refrigerant pipe 17 for flowing a refrigerant and a plurality of fins 15. The housing 22 is provided with a suction grill 20 and a blow grill 18. The indoor unit 1 is usually used by being embedded in a ceiling.

Next, the operation will be described. Due to the rotation of the impeller 2 in the direction of the arrow 3, the indoor air is taken into the interior of the indoor unit 1 from the suction grill 20. The air taken into the indoor unit 1 flows from the air intake 10 to the impeller 2
And is sent out from the space between the hub 6 and the shroud 4 to the outer peripheral side of the impeller 2 by the blowing blade 8. The air sent to the outer peripheral side of the impeller 2 flows between the plurality of fins 15 arranged in the refrigerant pipe 17. At this time,
Heat exchange takes place between the air and the refrigerant. The air subjected to the heat exchange is sent out from the outlet grill 18 into the room. As described above, indoor cooling or heating is performed.

[0006]

However, the heat exchanger using the above-described centrifugal fan has the following problems. First, FIG. 8 shows a partially enlarged perspective view of the heat exchange section 13 of the heat exchanger shown in FIG. As shown in FIGS. 7 and 8, each fin 15 is arranged along the direction of the rotation axis 5.

FIG. 9 schematically shows a cross-sectional structure of the indoor unit 1 on a plane perpendicular to the rotation axis 5 of the impeller 2. As shown in FIG. 9, the air is
From a certain point on the outer circumference of the impeller 2, it is sent out at an angle with a tangent at that point. For this reason, the components of the air flow sent from the impeller 2 and reaching the heat exchange unit 13 on a plane perpendicular to the rotation axis 5 are represented by arrows 2
3a to 23d.

In the heat exchange section 13, for example, air indicated by an arrow 23a in a dotted circle collides with each fin 15 as shown in FIG. At this time, since each fin 15 is disposed along the direction of the rotation axis as described above, the collision angle θ is relatively large.

As a result, noise generated when air collides with each fin 15 may be increased. Further, the pressure loss in the heat exchange unit 13 increases, and noise and power consumption may increase in order to obtain a desired amount of blown air.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a heat exchanger using a centrifugal air blowing means that can reduce noise and obtain a desired amount of blown air. I do.

[0011]

According to one aspect of the present invention, a heat exchanger using a centrifugal blower includes a centrifugal blower and a heat exchanger. The centrifugal blowing means takes in air from a central portion and sends out the taken-in air to the surroundings by rotation of an impeller around a rotation axis. The heat exchange means
It is provided so as to surround the centrifugal blower from the circumferential direction of rotation, and includes a pipe through which the refrigerant flows and a plurality of fins provided in the pipe. Each fin portion is arranged in a direction crossing the rotation axis.

According to this configuration, first, the air blown out from the impeller of the centrifugal blower flows between the fins of the heat exchanger. At this time, in the flow of air,
The angle (angle α) between the radial component connecting the rotation axis and the position where the air is sent out and the rotation axis direction component is smaller than the angle (angle β) between the radial component and the circumferential component. On the other hand, each fin portion is arranged in a direction crossing the rotation axis. For this reason, compared with the case where each fin part is arranged along the direction of the rotation axis, the collision angle when air collides with each fin part becomes smaller. As a result, noise generated when air collides with the fins is reduced. Further, before and after the air flows into and out of the fin, the pressure loss is suppressed, and a desired air volume can be obtained.

Preferably, each fin portion is arranged so as to be substantially parallel to the direction of air flow at the position where each fin portion is mounted.

[0014] In this case, the collision angle between the air and the fins is further reduced, and the air can flow more smoothly between the fins. As a result, the heat exchanger noise and pressure loss are further reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat exchanger using a centrifugal fan according to an embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a partially enlarged perspective view of the heat exchange unit 12 shown in FIG. Referring to FIGS. 1 and 2, an impeller 2 that rotates around a rotation shaft 5 by a rotation driving unit (not shown) is provided in a housing 22 of the indoor unit 1. The impeller 2 has a hub 6 to which a rotational driving force is transmitted by a rotating shaft 5. To face the hub 6,
A ring-shaped shroud 4 having an air inlet 10 opened near the center is provided. The shroud 4 and hub 6
Are provided with a plurality of blower blades 8 arranged at predetermined intervals in the circumferential direction. A centrifugal fan as a centrifugal blower including the impeller 2 and the rotary drive unit is configured.

The housing 22 is provided with a suction grille 20 for taking in indoor air and a blowout grill 18 for sending out heat-exchanged air into the room.

A heat exchange section 12 as heat exchange means is provided so as to surround the impeller 2 in the circumferential direction. The heat exchange section 12 is provided with a refrigerant pipe 16 for flowing a refrigerant and a plurality of fins 14.

As an example of a direction intersecting with the rotary shaft 5, each fin 14 is located on the side where the axial component of the air flow is directed to the position where the air flows out from the position where the air flows out. Are arranged as follows. That is, this fin 1
In No. 4, the position on the side from which the air flows out is arranged closer to the outlet grill 18 side.

Next, the operation of the heat exchanger using the above-described centrifugal fan will be described. The rotation of the impeller 2 in the direction of the arrow 3 allows indoor air to be taken into the interior of the indoor unit 1 from the suction grille 20 and from the air intake 10 into the impeller 2. The air taken into the impeller 2 is sent to the outer periphery of the impeller 2 by the blowing blade 8.

The flow of the air will be described with reference to the drawings. Referring to FIGS. 3 and 4, an outer peripheral end of the impeller 2 on the shroud 4 side is defined as an origin O, and a hub 6 is
Takes coordinate axes fixed in the space extending to the side. A radial component of a flow of air 24 that is sent from a certain point on the outer periphery of the impeller 2 and that is perpendicular to the rotation axis 5 and connects the rotation axis to the point is defined as a radial component 24a. Is a circumferential component 24b, and a component of the flow in the rotation axis direction is an axial component 24c.

The angle between the radial component 24a and the axial component 24c of the flow is defined as an angle α, and the angle between the radial component 24a and the circumferential component 24b is defined as an angle β.

The angles α and β were measured from the vicinity of the outer peripheral end of the shroud 4 to the vicinity of the outer peripheral end of the hub 6, and the results shown in FIG. 5 were obtained.

Referring to FIG. 5, it has been found that the angle α is always smaller than the angle β from the shroud 4 side to the hub 6 side. Specifically, while the angle β fluctuates in a range of about 52 ° to 70 °, the angle α is 14 ° to 34 °
It was found that it fluctuated within the range. Note that the angle β
Corresponds to the angle θ shown in FIG. 10 described in the section of the related art.

In the heat exchanger 12 of the present heat exchanger, each fin 14 is arranged in a direction intersecting with the rotating shaft 15. Here, the intersecting direction does not mean that the fins are arranged so that the collision angle between each fin and the air exceeds the angle β. In other words, for example, with respect to the axial component 24c of the air flow shown in FIG.
It is not intended to dispose each fin so as to be located extremely on the side opposite to the direction of 4c.

The intended arrangement of each fin is as follows.
For example, an arrangement in which the collision angle with air is an angle α, such as an arrangement parallel to a plane perpendicular to the rotation axis, or a position on the outflow side of the air, rather than a position on the inflow side, in the axial direction of the air flow The arrangement is such that the collision angle between the air and the fins is smaller than the angle α (the arrangement of the fins 14 in FIG. 1), which is located on the side where the component is facing.

With such an arrangement of the fins 15,
As shown in FIG. 10, as compared with the case of the conventional heat exchange section in which each fin section is arranged along the direction of the rotation axis, the collision angle when air collides with each fin is smaller. Become. As a result, noise generated when the air collides with the fins 14 is reduced. In addition, air is supplied to the heat exchange
, The pressure loss before and after the heat exchange unit 12 is reduced. As a result, a desired air volume can be sent.

Further, as shown in FIG.
Is preferably arranged so as to be substantially parallel to the direction of the air flow at the position where it is sent from the outer periphery of the impeller 2 and reaches the heat exchange unit 12. That is,
It is desirable to make the collision angle closer to 0 °.

In this case, since the collision angle when the air collides with each fin 14 is further reduced, the sent air flows between the fins 14 more smoothly.
This further reduces noise. In addition, each fin 1
No separation occurs in the flow of air in the vicinity of 4, and heat exchange between the air and the refrigerant in the refrigerant pipe 16 is favorably performed. Further, the pressure loss is further reduced. As a result, for the same rotation speed of the impeller, heat exchange can be performed favorably, and a desired air volume can be obtained.

Further, in the manufacture of the heat exchange section 12, arranging the fins 14 corresponding to the angle α increases the production cost. Therefore, the fins 14 correspond to the average value of the angle α from the shroud 4 side to the hub 6 side. You may arrange | position.

It should be noted that the embodiment disclosed this time is an example of all points and is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the range described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0031]

According to the heat exchanger using the centrifugal blower according to one aspect of the present invention, first, the air blown out from the impeller of the centrifugal blower is supplied between the fins of the heat exchanger. Flows through. At this time, in the flow of air,
The angle (angle α) between the radial component connecting the rotation axis and the position where the air is sent out and the rotation axis direction component is smaller than the angle (angle β) between the radial component and the circumferential component. On the other hand, each fin portion is arranged in a direction crossing the rotation axis. For this reason, compared with the case where each fin part is arranged along the direction of the rotation axis, the collision angle when air collides with each fin part becomes smaller. As a result, noise generated when air collides with the fins is reduced. Further, before and after the air flows into and out of the fin, the pressure loss is suppressed, and a desired air volume can be obtained.

Preferably, the fins are arranged so as to be parallel to the direction of air flow at the position where the fins are mounted, so that the collision angle between the air and the fins is further reduced. The air can flow more smoothly between the fins. As a result, the heat exchanger noise and pressure loss are further reduced.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a heat exchanger using a centrifugal fan according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional perspective view of a heat exchange unit of the heat exchanger using the centrifugal fan shown in FIG. 1 in the embodiment.

FIG. 3 is a cross-sectional perspective view for describing a flow of air sent from an impeller in the embodiment.

FIG. 4 is an enlarged perspective view for explaining a flow of air shown in FIG. 3 in the embodiment.

FIG. 5 is a graph showing an angle formed between a radial component and a rotational axis component of air flow from the shroud to the hub, and an angle formed between the radial component and the circumferential component in the embodiment. is there.

FIG. 6 is a partially enlarged schematic cross-sectional view showing an arrangement of fins in the embodiment.

FIG. 7 is a sectional perspective view of a conventional heat exchanger using a centrifugal fan.

8 is a partially enlarged perspective view of a heat exchange unit of the heat exchanger shown in FIG.

FIG. 9 is a schematic cross-sectional view for explaining a flow of air sent from an impeller of a heat exchanger using a conventional centrifugal fan.

FIG. 10 is a partially enlarged cross-sectional schematic diagram within a dotted frame shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Impeller 3 Rotation direction 4 Shroud 5 Rotating shaft 6 Hub 8 Blowing blade 10 Air intake 12 Heat exchange part 14 Fin 16 Refrigerant pipe 18 Blow grill 20 Suction grill 22 Housing 24 Air flow 24a Radial component 24b Circumferential component 24c Axial component

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Nasako 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A centrifugal blower for taking in air from a center portion and sending out the taken-in air to the surroundings by rotation of an impeller about a rotation axis, and provided so as to surround the centrifugal blower from a circumferential direction of rotation. Heat exchange means including a pipe for flowing a refrigerant and a plurality of fins provided in the pipe, wherein each of the fins is disposed in a direction intersecting with the rotation axis, a centrifugal type. Heat exchanger using blowing means. 2. The centrifugal air blower according to claim 1, wherein each of said fin portions is disposed so as to be substantially parallel to a direction of air flow at a position where each of said fin portions is mounted. Heat exchanger.