JP5024349B2 - Blower, air conditioner using the same, and air purifier - Google Patents

Description

  The present invention relates to a blower provided with a fan guide, an air conditioner using the same, and an air cleaner.

  Conventionally, in an indoor unit of a separate type air conditioner, a centrifugal blower is often used as a blower (see Patent Document 1 and Patent Document 2).

  As an example of the indoor unit of the air conditioner provided with the centrifugal blower as described above, FIG. 5 shows an indoor unit Z01 of the air conditioner provided with the centrifugal blower 62. The indoor unit Z01 includes a plurality of blades 66, 66, between a side plate 64 and a shroud 65 that are disposed opposite to each other in a casing 61 in which a suction port 71 and an air outlet (not shown) are provided on the same plane. A fan 62 composed of a centrifugal impeller 63 to which the fan is attached, a motor 72 that rotationally drives the impeller 63, and a fan guide 70 that faces the fan suction port 67 of the impeller 63; A heat exchanger 69 is arranged on the outer peripheral side of the blower 62 so as to surround it. In the indoor unit Z02, the upstream side and the downstream side of the impeller 63 are partitioned by the fan guide 70, and an air flow from the fan suction port 67 to the fan blower port 68 is formed by the pressure increasing action. It is what is done.

JP 2006-200769 A JP 2007-051790 A

  By the way, in the centrifugal blower used as a blower for an air conditioner in this way, there is a concern that problems such as a reduction in blowing efficiency or an increase in blowing noise may occur due to the reasons described below.

  That is, in the centrifugal blower 1, as shown in FIG. 5, the downstream end of the fan guide 70 is disposed facing the fan suction port 67 provided in the shroud 65 of the impeller 63, and both of them are relatively rotated. Therefore, an annular gap 73 is formed between the two, and the gap 73 faces the suction port 67 side of the blower 62. For this reason, a part of the high-pressure air blown from the blower outlet 68 of the blower 62 passes through the facing space 74 between the shroud 65 of the impeller 63 and the fan guide 70 facing the shroud 65, and the gap 74. The air is sucked out to the suction port 67 side, so-called “leakage flow” is generated, and a vortex N is generated in the facing space 74. In this case, since this vortex N is unstable and fluctuates depending on various blowing conditions such as a change in the operating state of the blower 62 or an increase in ventilation resistance due to a non-axisymmetric flow of air, Under the influence of the fluctuation of N, the flow state of the “leakage flow” also fluctuates, and as a result, in the blower 1, the blowing noise increases and the blowing performance decreases.

  Then, this invention is made | formed for the purpose of providing the air blower which realized coexistence with the reduction of ventilation noise, and the improvement of ventilation performance, an air conditioner, and an air cleaner using the same.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

In the first invention of the present application, a fan guide 30 whose diameter increases in a curved shape toward the upstream side is provided at the downstream end of the centrifugal impeller 20 provided with the shroud 22 having the suction port 24 on the upstream side. In the blower, which is disposed close to the upstream end 22b of the shroud 22 so that the portion 30b faces the fan suction port 24, the fan guide 30 is arranged along the outer surface 22a of the shroud 22 along the outer surface 22a. An air guide 18 is provided for guiding air toward the proximity of the downstream end 30b and the upstream end 22b of the shroud 22, and the air guide 18 is disposed radially on the outer surface 22a of the shroud 22. , Or a plurality of grooves 19, 19... Extending obliquely with respect to the radial direction .

The air conditioner according to the second invention of the present application is characterized in that the blower 1 according to the first invention is provided upstream or downstream of the heat exchanger 5.

The air cleaner according to the third invention of the present application is characterized in that the blower 1 according to the first invention is provided upstream or downstream of the air reforming device.

  In the present invention, the following effects can be obtained by adopting such a configuration.

(1) In the blower according to the first invention of the present application, the fan guide that changes in diameter toward the upstream side of the centrifugal impeller 20 provided with the shroud 22 having the suction port 24 in a curved shape toward the upstream side. 30 is disposed close to the upstream end portion 22b of the shroud 22 so that the downstream end portion 30b faces the fan suction port 24. The blower 30 is disposed on the outer surface 22a of the shroud 22 along the outer surface 22a. The air guide 18 is provided for guiding air toward the proximity of the downstream end 30b of the fan guide 30 and the upstream end 22b of the shroud 22, and the air guide 18 is connected to the outer surface of the shroud 22. 22a is constituted by a plurality of grooves 19, 19,... Extending in the radial direction or inclined with respect to the radial direction .

  Therefore, according to the blower of the present invention, when the impeller 20 rotates, the impeller 20 passes through the proximity of the downstream end portion 30b of the fan guide 30 and the upstream end portion 22b of the shroud 22 accordingly. A “leakage flow” that flows from the downstream side to the upstream side is generated, and an unstable vortex is generated in the space portion upstream of the “leakage flow” and where the fan guide 30 and the shroud 22 face each other. However, in this case, since the vortex generation site and the “leakage flow” generation site are both low pressure and a pressure difference is generated between the downstream region of the impeller 20, the blade The air in the downstream region of the vehicle 20 is guided by the air guide 18 due to this pressure difference, and is close to the downstream end 30b of the fan guide 30 and the upstream end 22b of the shroud 22, that is, It is introduced towards the generation site of the "leakage flow".

  Here, when the air guide part 18 is provided on the outer surface 22a of the shroud 22, the fluctuation of the vortex is made possible by the stable air flow introduced through the air guide part 18. The fluctuation of the “leakage flow” due to the fluctuation of the vortex is suppressed as much as possible, and as a result, the increase of blowing noise and the deterioration of blowing performance due to the fluctuation of “leakage flow” are possible Therefore, operation with low noise and high efficiency is realized.

In addition, the air guide portion 18 is configured by a plurality of grooves 19, 19... Extending on the outer surface 22 a of the shroud 22 in the radial direction or inclined with respect to the radial direction. Since the effect described in (1) above can be obtained with a simple structure, a low noise and high efficiency blower can be provided at a lower cost.

( 2 ) According to the air conditioner according to the second invention of the present application, by providing the blower according to the first invention on the upstream side or the downstream side of the heat exchanger 5, An air conditioner having air conditioning performance can be obtained.

( 3 ) According to the air cleaner according to the third invention of the present application, the air cleaner according to the first invention is provided with the blower according to the first invention on the upstream side or the downstream side of the air reforming device, thereby achieving a high level of quiet operation and air. An air purifier having a cleaning performance can be obtained.

It is principal part sectional drawing of the air blower concerning the 1st reference example of this invention, and an air conditioner using the same. It is an II-II arrow line view of FIG. It is principal part sectional drawing of the air blower concerning 1st Embodiment of this invention. It is the IV-IV arrow line view of FIG. It is sectional drawing of the conventional air conditioner. It is a "noise and static pressure-air volume" performance comparison figure of the air blower which concerns on this invention, and the conventional air blower.

Hereinafter, each invention of the present application will be specifically described based on reference examples and preferred embodiments.

First reference example (see FIGS. 1 and 2)
FIG. 1 shows a ceiling-embedded indoor unit Z1 of a separate air conditioner that includes a centrifugal fan according to a first reference example of the present invention . This indoor unit Z1 is centrifuged in an in-machine space surrounded by a casing 2 embedded in the back of the ceiling through an indoor ceiling 27 and a suction panel 26 abutted and fixed to the lower surface opening of the casing 2 from the indoor side. The blower 1 and the heat exchanger 5 are accommodated. The suction panel 26 is provided with a suction port 3 at the center and a blower outlet 4 at the periphery.

  The blower 1 includes an impeller 20 having a plurality of blades 23, 23,... Mounted between the side plate 21 and the shroud 22 facing each other at a predetermined interval in the circumferential direction, and the casing 2. A fan 6 described below disposed between the motor 6 that is fixed to the ceiling and rotationally drives the impeller 20, and the fan inlet 24 of the impeller 20 and the inlet 3 on the suction panel 26 side. And a guide 30.

  The fan guide 30 includes an annular flange portion 30A, a curved portion 30B that rises in a curved manner on one side of the flange portion 30A, and an outer end of the curved portion 30B. And a straight tube portion 30C extending in the axial direction. The diameter of the straight tube portion 30C is set so that the straight tube portion 30C can enter the fan suction port 24 of the blower 1 in a close state.

Further, in the outer surface 30a of the fan guide 30, a region extending from the boundary between the curved portion 30B and the straight tube portion 30C to the intermediate portion of the flange portion 30A is configured with a number of grooves 19, 19,. An air guide 18 is provided. In this embodiment, as shown in FIG. 2, the grooves 19, 19,... Have an outer end 19 b near the flange 30 </ b> A with respect to an inner end 19 a near the straight cylinder 30 </ b> C. The inclined groove is located on the front side in the rotational direction of the impeller 20 (the direction of arrow R in FIG. 2). The groove 19 may be an inclined groove located on the rear side in the rotational direction of the impeller 20 or a groove extending in the radial direction. Further, in this reference example, although the straight groove the groove 19, in other forms condition may be a so curved grooves or curved groove.

  The fan guide 30 configured in this manner is fixed to the casing 2 side in a state where the downstream end portion 30b formed by the end portion of the straight cylinder portion 30C is superposed on the fan suction port 24 of the blower 1. ing. Accordingly, in the mounted state of the fan guide 30, the blades are disposed between the end of the straight cylinder portion 30C, that is, the downstream end 30b and the upstream end 22b of the shroud 22 on the impeller 20 side. An annular gap 31 that connects the fan inlet 24 and the fan outlet 25 of the vehicle 20 is formed. Further, on the outer side in the radial direction of the gap 31, the outer surface 22a of the shroud 22 of the impeller 20 and the outer surface 30a of the fan guide 30 face each other, and between the gap 31 and the impeller 20 A facing space 32 that faces the fan outlet 25 is formed. A heat exchanger 5 is disposed outside the fan blower outlet 25 of the impeller 20 so as to surround the impeller 20.

In the indoor unit Z1 of this reference example , the indoor air sucked into the fan suction port 24 from the suction port 3 through the fan guide 30 as the impeller 20 rotates is the air flow A. As shown, after being blown out from the fan outlet 25 of the impeller 20, it passes through the heat exchanger 5, and is heated or cooled by heat exchange in the heat exchanger 5. It is blown into the room.

  In this case, the gap 31 is formed between the upstream end portion 22 b of the shroud 22 of the impeller 20 and the downstream end portion 30 b of the fan guide 30. Since it faces the fan air outlet 25 of the impeller 20, a part of the high-pressure air blown out from the fan air outlet 25 of the impeller 20 returns to the facing space 32 and is unstable here. While generating a vortex, a part of this reflux air flows through the gap 31 to the fan suction port 24 side, and a “leakage flow” occurs in the gap 31 portion. This “leakage flow” has almost no adverse effect on the blowing noise and blowing performance when this is a stable flow, but when this becomes unstable and the flow fluctuates, the turbulent flow causes the blades 23 of the impeller 20 to move. , 23,..., The air blowing noise and the air blowing performance are lowered. Further, the fluctuation of the “leakage flow” is caused by the fluctuation of the flow state of the vortex generated in the facing space 32, and the flow state of the vortex is, for example, the ventilation resistance of the blower 1. Variation is caused by various conditions such as variation. Therefore, in order to suppress the blowing noise and the deterioration of the blowing performance due to the fluctuation of the “leakage flow”, a method of directly acting on the “leakage flow” to stabilize the flow and suppressing the fluctuation, A method of suppressing the fluctuation of the “leakage flow” indirectly by suppressing the fluctuation of the vortex flow in the facing space 32 that causes the fluctuation of the “flow”.

Therefore, in this reference example , the former method of the above two methods is adopted, and for this purpose, as described above, the outer surface 30a of the fan guide 30 has a large number of grooves 19, 19,. The constructed air guide 18 is provided. The latter method will be described in the first embodiment described below.

  As described above, when the air guide portion 18 is provided on the outer surface 30a of the fan guide 30, the following action is obtained. That is, the gap 31 where the “leakage flow” occurs is at a lower pressure than the area corresponding to the outer end of the grooves 19, 19,... Yes. Therefore, the grooves 19, 19,... Are formed on the outer surface 30a of the fan guide 30 facing the facing space 32, so that the high-pressure air in the region near the facing space 32 is caused by the pressure difference. , 19,... Are introduced into the gap 31 side. In this case, since the flow direction of the introduced air coincides with the flow direction of the “leakage flow”, the introduced air that is a stable flow flows into the gap 31 to generate a “leakage flow”. It will be. In addition, the “leakage flow” is hardly affected by the vortex flow in the facing space 32, and thus is a stable flow with little fluctuation.

  As a result, even if fluctuations occur in the flow of vortices generated in the facing space 32, the “leakage flow” remains stable, and the blower 1 has good blowing noise and blowing performance. It is maintained (see FIG. 6).

1st Embodiment (refer FIG.3 and FIG.4)
3 and 4 show a main part of the centrifugal blower 1 according to the first embodiment of the present invention . Blower 1 of this embodiment, the first blower 1 according to a reference example the basic configuration been made to the same, which is different from, the air in blower 1 of the first reference example Whereas the guide portion 18 is provided on the outer surface 30a of the fan guide 30, the air guide portion 18 is provided on the outer surface 22a of the shroud 22 of the impeller 20 in the blower 1 of this embodiment. . This is because the latter of the two methods for suppressing the fluctuation of the “leakage flow” described above, ie, the vortex generated in the facing space 32 that causes the fluctuation of the “leakage flow”. This is a result of adopting a technique for suppressing flow fluctuations. This will be specifically described below.

  That is, as shown in FIGS. 3 and 4, a large number of inclined grooves 19, 19,... Are formed in the circumferential direction on the outer surface 22 a of the shroud 22 of the impeller 20 (that is, the surface facing the facing space 32). Are formed at predetermined intervals, and the air guide portion 18 is constituted by the grooves 19, 19,. In addition to the linear inclined groove as in this embodiment, the groove 19 can be a groove extending in the radial direction, a curved groove, or a bent groove.

  When the air guide portion 18 having such a configuration is provided on the outer surface 22a of the shroud 22 of the impeller 20, the following operation is obtained.

  That is, when the air guide 18 is provided on the outer surface 20a of the shroud 22, a stable flow of air introduced from the vicinity of the facing space 32 toward the gap 31 through the air guide 18 is used. The fluctuation of the vortex generated in the facing space 32 is suppressed as much as possible, and the fluctuation of the vortex is prevented as much as possible from affecting the “leakage flow”. The above "leakage flow" is stabilized and its fluctuations are suppressed as much as possible, and the increase in blowing noise and the reduction in blowing performance due to the fluctuations in the "leakage flow" are prevented as much as possible to reduce noise. In addition, highly efficient operation is realized (see FIG. 6).

In the first reference example , of the outer surface 22a of the shroud 22 of the impeller 20 and the outer surface 30a of the fan guide 30 facing the facing space 32, the air guide portion is connected to the outer surface 30a of the fan guide 30. In addition, in the first embodiment, by providing the air guide 18 on the outer surface 22a of the shroud 22, both the reduction of the blowing noise and the improvement of the blowing performance are realized. In another embodiment of the present invention, it is also possible to employ a configuration in which the air guide portions 18 and 18 are provided on both the outer surface 22a of the shroud 22 and the outer surface 30a of the fan guide 30, respectively. In this case, a synergistic effect of the operational effect in the first reference example and the operational effect in the first embodiment can be obtained.

Further, in the above reference examples and embodiments, the case where the blower 1 is applied as the air conditioner blower 1 has been described as an example. However, the blower of the present invention is an air reformer such as a deodorizing device or a dust removing device. The present invention can also be applied as a blower for an air cleaner equipped with a device.

  1 is a blower, 2 is a casing, 3 is an inlet, 4 is an outlet, 5 is a heat exchanger, 6 is a motor, 18 is an air guide, 19 is a groove, 20 is an impeller, 21 is a side plate, 22 is a shroud , 23 is a blade, 24 is a fan inlet, 25 is a fan outlet, 26 is a suction panel, 30 is a fan guide, and Z1 is an indoor unit.

Claims (3)

On the suction port (24) side of the centrifugal impeller (20) provided with the shroud (22) having the suction port (24), a fan guide (30) whose diameter increases in a curved shape toward the upstream side, A blower that is arranged close to the upstream end (22b) of the shroud (22) so that the downstream end (30b) faces the fan suction port (24),
The outer surface (22a) of the shroud (22) is formed along the outer surface (22a) with a downstream end (30b) of the fan guide (30) and an upstream end (22b) of the shroud (22). An air guide portion (18) that guides air toward the adjacent portion is provided, and the air guide portion (18) is arranged on the outer surface (22a) of the shroud (22) in the radial direction or in the radial direction. A blower characterized by comprising a plurality of grooves (19), (19),. Upstream or downstream of the heat exchanger (5), an air conditioner which is characterized by being configured with blower (1) according to claim 1. Upstream or downstream of the air reforming device, air cleaner, characterized in that it is configured with a blower (1) according to claim 1.

Images