JP4872997B2 - Blower and air conditioner equipped with the blower - Google Patents

Description

  The present invention relates to a blower including a shroud impeller and an air conditioner using the blower.

  Generally, in a centrifugal or mixed flow blower configured with an impeller with a shroud, air sucked from an air suction port on the front side in the axial direction of the impeller is blown out from an air outlet on the outer periphery side of the impeller. Therefore, the intake air from the air suction port is unevenly distributed near the blade base end (that is, close to the main plate of the impeller) due to its inertial force, and the wind speed distribution at the blade outlet portion is close to the blade base end. As a result, there is a problem that the aerodynamic performance is lowered and the operation noise is increased.

  As a technique for improving such problems and improving aerodynamic performance and reducing driving noise, for example, a proposal as shown in Patent Document 1 has been made. The one disclosed in Patent Document 1 has an impeller provided with a shroud impeller facing a bell mouth-shaped air suction port, and a ring on the tip outer periphery of each impeller of the impeller. A member is provided, and part of the blown air sucked into the impeller from the air suction port and blown out from the blade outlet side bypasses the outer peripheral side of the ring member and passes through the back side of the air suction port again. By sucking in the blade side, a circulation flow is formed around the ring member, and by the suction action of the circulation flow, the main flow air sucked from the air suction port and blown out through the blade is moved to the blade tip side. This is intended to improve aerodynamic performance and reduce driving noise.

JP 2006-194235 A

  By the way, as described in the above-mentioned Patent Document 1, the ring member provided on the outer peripheral portion of the tip of the blade has a thick plate-like cross section or a circular cross section from the functional aspect of forming a circulating flow. Since the ring member is formed so as to realize a smooth flow of the circulating flow, the ring member is extremely thicker than the blade.

  However, if the ring member has an extremely thick structure as compared with the blades as described above, when the ring member is molded integrally with the impeller including the blades, the thickness of both of the ring members may be reduced. Quality problems such as the occurrence of sink marks due to equality, material cost problems such as increased material costs due to increased wall thickness, and production cost problems such as decreased productivity due to increased wall thickness. This has been a problem in promoting cost reduction of the blower.

  Then, this invention is made | formed for the purpose of providing the air conditioner provided with the air blower which enabled thinning of the ring member, and this air blower, maintaining the circulating flow formation function by a ring member favorably. .

    In the present invention, the following unique configuration is adopted as means for solving the above-described problems.

  In the first invention of the present application, the front plate 1b is provided with a bell mouth-like air suction port 5a, and the air casing 7 is provided with an air outlet 7 on the outer peripheral portion thereof. A plurality of blades 3, a circular main plate 2 that supports and fixes the base end side of each blade 3, and a ring member 8 having an annular shape provided on the outer periphery of the tip of each blade 3 to form a circulating flow. In the blower that houses the impeller Y that is provided, an annular shape that is recessed from the peripheral surface 8b toward the main plate 2 on the entire periphery of the peripheral surface 8b of the ring member 8 on the front plate 1b side. A concave groove 15 is provided, and a portion of the peripheral surface 8b from the inner peripheral side edge of the annular concave groove 15 to the outer peripheral portion of the tip of each blade 3 is defined as a substantially arcuate surface, which is used as the suction guide surface 16. It is characterized by that.

  The second invention of the present application is characterized in that, in the blower according to the first invention, the ring member 8 is disposed close to the front plate 1b.

  The third invention of the present application is characterized in that in the blower according to the first or second invention, the annular groove 15 has a U-shaped cross-sectional shape.

In the fourth invention of the present application, in the blower according to the first , second, or third invention, the front plate 1b extends from the front plate 1b to the ring member 8 side, and the tip thereof is the annular shape. An annular partition plate 9 that enters the recessed groove 15 is provided.

In the fifth invention of the present application, the front plate 1b is provided with a bell mouth-like air suction port 5a, and the air casing 7 is provided with an air outlet 7 on the outer peripheral portion thereof. A plurality of blades 3, a circular main plate 2 that supports and fixes the base end side of each blade 3, and a ring member 8 having an annular shape provided on the outer periphery of the tip of each blade 3 to form a circulating flow. In the blower that accommodates the impeller Y that is provided, the entire circumference of the peripheral surface 8b of the ring member 8 on the front plate 1b side is a guide surface having a substantially L-shaped cross section, and the guide surface 8b. A portion from the inner peripheral edge of the blade 3 to the outer periphery of the tip of each blade 3 is a substantially arcuate surface, which is used as the suction guide surface 16.

In a sixth invention of the present application, in the blower according to the fifth invention, the front plate 1b has an annular shape that extends from the front plate 1b toward the ring member 8 and has a tip portion close to the guide surface 8b. A partition plate 9 is provided.

  In the seventh invention of the present application, in the blower according to the first, second, third, fourth, fifth, or sixth invention, the air blowing from the front plate 1b to the back side of the front plate 1b. An annular air blowing guide member 6 having a blowing air flow guide surface in the mixed flow centrifugal direction is provided toward the outlet 7 side.

  In the eighth invention of the present application, in the blower according to the first, second, third, fourth, fifth, or sixth invention, the front plate 1b to the back plate on the back side of the front plate 1b. A substantially conical cylindrical air blowing guide plate 6 that gradually increases in diameter toward the 1a side is provided so as to wrap around the outer peripheral portion of the impeller Y.

  In the ninth invention of the present application, in the air conditioner configured by arranging the heat exchanger 10 and the blower X in the ventilation path in the casing 20, the blower X is defined as claims 1, 2, 3, 4. The blower X described in 5, 6, 7 or 8 is employed.

  In each invention of the present application, the following specific effects can be obtained.

  (A) According to the first invention of the present application, the annular groove that is recessed from the peripheral surface 8b toward the main plate 2 on the entire periphery of the peripheral surface 8b of the ring member 8 on the front plate 1b side. As a result, the ring member 8 can be made thinner by reducing the thickness associated with the formation of the annular groove 15, and as a result, the thickness of the ring member 8 and the thickness of the blade 3 can be equalized. In addition, the occurrence of sink marks in the case of integrally molding the blade 3 and the ring member 8 is suppressed, the quality of the impeller Y is maintained, the material cost is reduced by the reduced thickness, and the productivity is improved. Become.

  On the other hand, since the portion of the peripheral surface 8b from the inner peripheral side edge of the annular groove 15 to the outer peripheral portion of the tip of each blade 3 is formed as a substantially arcuate surface, the suction guide surface 16 is used as the ring member. In spite of the provision of the annular concave groove 15 in FIG. 8, the flow of the circulating flow to the blade 3 side becomes smooth by the guide action of the suction guide surface 16, and the air outlet portion of the blade 3 by the suction action of the circulating flow The wind speed distribution at is improved.

  As these synergistic effects, there can be obtained a specific effect that high quality and low cost of the blower are promoted, aerodynamic performance is improved, and driving noise is reduced.

  (B) In the second invention of the present application, in addition to the effects described in (a) above, the following specific effects can be obtained.

  That is, in the present invention, the ring member 8 is disposed close to the front plate 1b, so that the airflow flowing from the outer end side of the blade 3 to the back side of the front plate 1b is the front plate 1b. Between the rear surface of the front plate 1b and the portion of the ring member 8 that is close to and opposite to the rear surface and that is located on the outer peripheral side and gradually approaches the rear surface of the front plate 1b. The flow of rectified air flows to the outer peripheral tip side of the blade 3 as a circulating flow, thereby further promoting the effect of improving the wind speed distribution at the air outlet portion of the blade 3 by the suction action of the circulating flow, Further improvement in air blowing performance can be expected.

  Further, the circulating flow after passing through the back surface of the front plate 1b and the adjacent portion of the ring member 8 flows into the outer end portion of the blade 3 after the flow velocity is reduced as the passage expands. Aerodynamic noise generated at the outer end is reduced.

  Furthermore, the flow rate of the circulating flow is reduced due to the reduction of the flow path associated with the proximity of the back surface of the front plate 1b and the ring member 8, and the required axial power of the blower X is reduced correspondingly, and the energy saving operation is promoted.

  (C) In the third invention of the present application, in addition to the effects described in the above (a) or (b), the following specific effects can be obtained.

  That is, in the present invention, since the annular groove 15 has a U-shaped cross-sectional shape, a smooth circulating flow is generated in the annular groove 15 having the U-shaped cross section by the Coanda effect, and the circulating flow is a groove portion. The outer original circulation flow is more smoothly guided to the outer peripheral side tip of the blade 3 to be sucked more efficiently.

  Therefore, the effect of improving the wind speed distribution at the air outlet portion of the blade 3 by the above-described suction action of the circulating flow is further promoted, and further improvement of the blowing performance is expected.

(D) In the fourth invention of the present application, in addition to the effects described in the above (a) , (b), or ( c ), the following specific effects can be obtained.

That is, in the present invention, the front plate 1b is provided with the annular partition plate 9 extending from the front plate 1b toward the ring member 8 and having its tip portion entering the annular groove 15, so that The flow is regulated by flowing from the upstream side to the downstream side of the annular partition plate 9 through a bending gap between the inner surface of the annular groove 15 and the outer surface of the annular partition plate 9, and this regulation is performed. The air flow is sufficiently decelerated as a circulation flow and flows toward the outer peripheral tip of the blade 3, thereby further promoting the effect of improving the wind speed distribution at the air outlet portion of the blade 3 by the suction action of the circulation flow, Further improvement can be expected.

(E) According to the fifth invention of the present application, the entire circumference of the peripheral surface 8b on the front plate 1b side of the ring member 8 is a guide surface having a substantially L-shaped cross section . Thinning of the ring member 8 is realized by the thinning accompanying the formation, and as a result, equalization of the thickness of the ring member 8 and the thickness of the blade 3 is promoted, and the blade 3 and the ring member 8 are integrally molded with resin. In this case, the occurrence of sink marks is suppressed, the quality of the impeller Y is maintained, the material cost is reduced by the reduced thickness, and the productivity is improved.

On the other hand, since the portion from the inner peripheral side edge of the guide surface 8b to the tip outer peripheral portion of each blade 3 is a substantially arc-shaped surface, which is used as the suction guide surface 16, the guide surface is provided on the ring member 8. Nevertheless, the guide action of the suction guide surface 16 makes the circulation flow smoothly flow into the blade 3 side, and the wind speed distribution in the air outlet portion of the blade 3 is improved by the suction action of the circulation flow.

As these synergistic effects, there can be obtained a specific effect that high quality and low cost of the blower are promoted, aerodynamic performance is improved, and driving noise is reduced.

(F) In the sixth invention of the present application, in addition to the effects described in (e) above, the following specific effects can be obtained.

That is, in this invention, the front plate 1b is provided with the annular partition plate 9 extending from the front plate 1b toward the ring member 8 and having its tip portion close to the guide surface 8b. The flow is restricted by flowing from the upstream side to the downstream side of the annular partition plate 9 through the bending gap between the inner surface of the guide surface 8b and the outer surface of the annular partition plate 9, and this restricted air flow Is sufficiently decelerated as a circulation flow and flows toward the outer peripheral tip side of the blade 3, thereby further improving the effect of improving the wind speed distribution at the air outlet portion of the blade 3 by the suction action of the circulation flow, and further improving the blowing performance. I can expect.

  (G) In the seventh invention of the present application, in addition to the effects described in the above (a), (b), (c), (d), (e) or (f), the following specific effects Is obtained.

  That is, in the present invention, an annular air blowing guide member 6 having a blown air flow guide surface in the oblique flow centrifugal direction from the front plate 1b to the air outlet 7 side is provided on the back side of the front plate 1b. Therefore, the flow of the circulating flow formed by the ring member is not only smooth, but also the blowout main flow that is drawn to the front plate side by the suction action of the circulating flow is effectively guided in the diagonal flow centrifugal direction. As a result, the air is blown out more smoothly.

  (H) In the eighth invention of the present application, in addition to the effects described in (a), (b), (c), (d), (e), (f) or (g), A unique effect can be obtained.

  That is, in the present invention, a substantially conical cylindrical air blowing guide plate 6 that gradually changes in diameter from the front plate 1b toward the back plate 1a is provided on the back side of the front plate 1b. Since the air flow blown out from the entire circumference of the impeller Y is rectified while receiving the contraction action by the air blowing guide plate 6, the aerodynamic performance is improved. Further improvement and blowing noise are reduced, and as a result, further improvement in the blowing performance of the blower X can be expected.

  (I) According to the ninth invention of the present application, in the air conditioner configured by disposing the heat exchanger 10 and the blower X in the ventilation path in the casing 20, , 3, 4, 5, 6, 7 or 8, since the blower X has low noise and high blowing performance, the air conditioner Z provided with the blower X is used. The air conditioner Z can be provided with quiet operation and good air-conditioning characteristics and with high commercial value.

  Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings.

<I: First Embodiment>
1 and 2 show a centrifugal blower X as a first embodiment of the blower X according to the present invention. The blower X is configured by accommodating an impeller Y in a fan casing 1.

  The fan casing 1 includes a back plate 1a and a front plate 1b. A bell mouth 5 serving as an air inlet 5a is formed at the center of the front plate 1b, and an air outlet is provided at the outer periphery thereof. 7 is formed.

  The impeller Y is attached to the outer peripheral portion 2b of the disk-shaped main plate 2 which is attached to the rotary shaft 4a of the fan motor 4 fixed to the central portion on the back side of the back plate 1a of the fan casing 1 and is driven to rotate. A function of standing a large number (for example, 30 to 40) of blades 3 at predetermined intervals in the circumferential direction and reinforcing and fixing the front end side of the blades 3 to the outer end of the front end of each blade 3 And a ring member 8 that forms a circulating flow, which will be described later, is formed integrally with the blade 3.

  The ring member 8 is formed of an annular body having a cross-sectional shape having a substantially circular shape as a basic shape, and the peripheral surface 8b near the tip of the blade 3 is directed from the peripheral surface 8b toward the axial direction of the impeller Y. An annular groove 15 is provided to be recessed, and the peripheral surface 8a near the base end of the blade 3 is inclined so as to approach the main plate 2 side from the outer peripheral end of the blade 3 toward the radially outer side. A guide surface 18 is provided. Further, in the peripheral surface 8 b, a portion located on the inner peripheral side from the annular concave groove 15 is a suction guide surface 16, and a portion located on the outer peripheral side is a contracted surface 17.

  In this embodiment, the ratio “H / of the outer diameter D (see FIG. 1) of the impeller Y and the height dimension H (see FIG. 2) of the ring member 8 in the radial direction of the impeller Y. D ”is set in a range of“ 0.05 <H / D <0.225 ”.

  By the way, in general, in a blower equipped with an impeller with a shroud, when the impeller Y is rotationally driven by the fan motor 4, air is sucked from the air suction port 5a, and this is used as the mainstream air A1. In this case, the mainstream air A1 is sucked from the front in the axial direction of the impeller Y and blown in the radial direction. Due to the inertial force of the flow, the blade 3 portion is biased toward the main plate 2 side, and the outlet side of the blade 3 is biased toward the main plate 2 side. As a result, the aerodynamic performance of the blower X is reduced, and the operating noise is reduced. Will increase.

  However, in the blower X of this embodiment, since the ring member 8 is provided on the outer periphery of the tip of the blade 3 of the impeller Y, the blower 3 is blown out from the outlet side of the blade 3 as shown in FIG. Part of the mainstream air A1 bypasses the outer peripheral side of the ring member 8 and flows to the inner peripheral side of the ring member 8 through the gap between the peripheral surface 8b near the front plate of the ring member 8 and the front plate 1b. Then, a circulation flow A2 is formed which is sucked again into the blade 3 side. The mainstream air A1 is attracted to the tip side of the blade 3 by the suction action of the circulating flow A2, and the wind speed distribution on the outlet side of the blade 3 is improved. As a result, the aerodynamic performance of the blower X is improved. The air blowing performance is improved, for example, the driving noise is reduced.

  In this case, the ratio “H / D” between the outer diameter D of the impeller Y and the height dimension H of the ring member 8 in the radial direction of the impeller Y is “0.05 <H / D <0. By setting to the range of “225”, a suitable wall surface adhesion effect of the air flow is obtained in the ring member 8, and the formation of the circulation flow A2 is further promoted.

  On the other hand, the ring member 8 is formed by resin integral molding together with the blade 3, but when the ring member 8 has a solid and substantially circular cross section, when compared with the thin blade 3, The thickness between these two parts becomes extremely uneven, and as a result, the quality deteriorates due to the occurrence of sink marks when the resin is integrally molded, or the material cost is increased by the thickness, and the productivity is inferior. As described above, there is a problem.

  In this embodiment, the annular groove 15 that is recessed from the peripheral surface 8b toward the main plate 2 is formed on the entire circumference of the peripheral surface 8b of the ring member 8 on the front plate 1b side. The ring member 8 is thinned by providing and reducing the thickness accompanying the formation of the annular groove 15.

  As a result, equalization of the thickness of the ring member 8 and the thickness of the blade 3 is promoted, the occurrence of sink marks when the blade 3 and the ring member 8 are integrally molded with resin is suppressed, and the quality of the impeller Y is maintained. As a result, the material cost is reduced by the reduced thickness and the productivity is improved.

  Moreover, since the part from the inner peripheral side edge part of the said annular groove 15 to the front-end | tip outer peripheral part of each said blade | wing 3 is made into the substantially circular arc-shaped surface in the said peripheral surface 8b, and it is set as the suction guide surface 16, the said ring member Despite the provision of the annular groove 15 in FIG. 8, the flow of the circulating flow A2 toward the blade 3 side is smooth due to the guide action of the suction guide surface 16, and the air of the blade 3 is sucked by the suction action of the circulating flow A2. The wind speed distribution at the exit is improved.

  Further, in the above configuration, since the annular groove 15 has a U-shaped cross-sectional shape, a circulating flow due to the Coanda effect as shown in the figure is generated in the annular groove 15 having the U-shaped cross section, and the same circulating flow. However, the original circulation flow A2 outside the groove is guided more smoothly to the tip of the outer peripheral side of the blade 3 and is sucked more efficiently.

  Therefore, the effect of improving the wind speed distribution in the air outlet portion of the blade 3 by the suction action of the circulating flow A2 described above is further promoted, and further improvement of the blowing performance is expected.

  As these synergistic effects, the improvement of the quality and cost reduction of the blower X of this embodiment, the improvement of the aerodynamic performance, and the reduction of the driving sound are compatible.

<II: Second Embodiment>
FIG. 3 shows a centrifugal blower X as a second embodiment of the blower X according to the present invention. The blower X has the same basic configuration as that of the blower X according to the first embodiment. The difference is that the blower X of the first embodiment is different from the ring member 8 and the front part. Whereas the distance between the face plates 1b is a relatively large dimension “S1”, in the blower X according to the second embodiment, the distance is set to a dimension “S2” smaller than the above “S1” (that is, the above-described distance). The ring member 8 is arranged close to the front plate 1b).

Thus, by bringing the ring member 8 close to the front plate 1b, a contraction action is exerted on the circulating flow A2 flowing between them. As a result of this contracted flow action, the circulating flow A2 is rectified, and the rectified circulating flow A2 flows toward the tip of the outer periphery of the blade 3, whereby the air of the blade 3 due to the suction action of the circulating flow A2 The effect of improving the wind speed distribution at the outlet portion is further promoted, and further improvement in the blowing performance can be expected.

  In addition, the circulating flow A2 after passing through the back surface of the front plate 1b and the adjacent portion of the ring member 8 flows into the outer end portion of the blade 3 after the flow velocity is reduced as the passage expands. Aerodynamic noise generated at the outer end is reduced.

  Furthermore, the flow rate of the circulating flow is reduced due to the reduction of the flow path due to the proximity of the back surface of the front plate 1b and the ring member 8, and the required axial power of the blower X is reduced correspondingly, and energy saving operation is promoted. Also become.

  Since the configuration and operational effects other than those described above are the same as those in the case of the first embodiment, the description here will be omitted by using the corresponding description of the first embodiment.

<III: Third Embodiment>
FIG. 4 shows a centrifugal blower X as a third embodiment of the blower X according to the present invention. The blower X has the same basic configuration as the blower X according to the first embodiment, and is different from this in that both edges of the annular groove 15 having the U-shaped cross section of the ring member 8 are described. The outer ends of the portions 15a and 15b are formed on arcuate surfaces.

  By adopting such a configuration, a smoother circulation flow is formed in the annular groove 15 having the U-shaped cross section, and the circulation flow more smoothly impellers the original circulation flow A2 outside the groove portion. 3 is guided to the outer peripheral side tip portion, and can be sucked more efficiently.

  Therefore, the flow of the circulating flow A2 around the ring member 8 becomes smoother, the aerodynamic performance is improved and the operation noise is further reduced, and the blowing performance of the blower X is further improved.

  Since the configuration and operational effects other than those described above are the same as those in the case of the first embodiment, the description here will be omitted by using the corresponding description of the first embodiment.

<IV>: Fourth Embodiment FIGS. 5 and 6 show a centrifugal blower X as a fourth embodiment of the blower X according to the present invention. The blower X has the same basic configuration as the blower X according to the first embodiment. The difference is that the front plate 1b of the fan casing 1 is changed from the front plate 1b to the front plate 1b. The point is that an annular partition plate 9 extending toward the ring member 8 and having a tip portion entering the annular groove 15 is provided.

  According to such a configuration, the circulating flow A2 flows from the upstream side to the downstream side of the annular partition plate 9 through a bending gap between the inner surface of the annular groove 15 and the outer surface of the annular partition plate 9. The flow in the circulation channel is restricted, and the circulation flow A2 is sufficiently decelerated and flows toward the outer peripheral tip of the blade 3, so that the wind speed distribution in the air outlet portion of the blade 3 due to the suction action of the circulation flow A2 is reduced. The improvement effect is further promoted, and further improvement of the blowing performance can be expected.

  Since the configuration and operational effects other than those described above are the same as those in the case of the first embodiment, the description here will be omitted by using the corresponding description of the first embodiment.

<V: Fifth Embodiment>
FIG. 7 shows a centrifugal blower X as a fifth embodiment of the blower X according to the present invention. The blower X has the same basic configuration as that of the blower X according to the fourth embodiment, and the difference is that the ring X of the ring member 8 is different from the blower X of the fourth embodiment. In contrast to the concave groove 15 having a U-shaped cross section, in the fifth embodiment, the entire circumference of the peripheral surface 8b of the ring member 8 on the front plate 1b side is substantially L-shaped in cross section. This is the point of the guide surface .

  Therefore, a bending gap is formed only on the inner peripheral side of the annular partition plate 9, but this bending gap restricts the flow of the circulating flow A2 flowing therethrough, and the circulating flow A2 is sufficiently decelerated so that the outer peripheral tip of the blade 3 Since it flows to the part side, the improvement effect of the wind speed distribution in the air outlet portion of the blade 3 by the suction action of the circulating flow A2 can be obtained.

  Since the configuration and operational effects other than those described above are the same as those in the case of the first embodiment, the description here will be omitted by using the corresponding description of the first embodiment.

<VI: Sixth Embodiment>
8 and 9 show a centrifugal blower X as a sixth embodiment of the blower X according to the present invention. The blower X has the same basic configuration as the blower X according to the first embodiment, and differs from the blower X on the back side of the front plate 1b from the front plate 1b to the back plate. The point is that a substantially conical cylindrical air blowing guide plate 6 that gradually increases in diameter toward the 1a side is provided so as to wrap around the outer peripheral portion of the impeller Y.

  Thus, by providing the air blowing guide plate 6 so as to wrap the outer periphery of the impeller Y, the passage area of the air blowing port 7 is reduced by the amount of the air blowing guide plate 6 disposed. The mainstream air A1 blown out from the impeller Y is rectified by receiving a contraction action while flowing from the outlet portion of the blade 3 toward the air outlet 7 side. When the rectified mainstream air A1 is blown out from the air outlet 7, the aerodynamic performance of the blower X is improved and the quiet operation is realized by reducing the operation noise.

  In addition, according to such a configuration, the inclined plate 6a portion having an enlarged diameter of the air blowing guide plate 6 is associated with the outer periphery of the ring member 8 having a U-shaped cross section. The front plate 1b side portion of the inclined plate 6a is directed to the guide surface in the circulation direction of the circulating flow A2, and the air outlet 7 side portion is blown in the diagonal flow centrifugal direction. Acts as a guide surface.

  Therefore, the flow of the circulating flow A2 formed by the ring member 8 described above becomes smoother, while the blowout main flow that flows while being drawn from the back plate 1a side to the front plate 1b side by the suction action of the circulating flow A2. A1 is also guided more effectively in the mixed flow centrifugal direction and blown out more smoothly. As a result, driving noise is further reduced and aerodynamic performance is further improved.

  In addition, about the reduction effect of this driving noise, this was confirmed by experiment. That is, in the blower X, the noise level is measured when the ratio “S / D” between the outer diameter D of the impeller Y and the distance S between the ring member 8 and the back surface of the front plate 1b is changed. This is shown in FIG. According to the characteristic diagram of FIG. 10, it can be seen that the ratio “S / D” is kept low in the range of 0.025 or less, and the noise level increases when the ratio exceeds this ratio. Therefore, based on the experimental results, in the case where the air blowing guide plate 6 is provided, in order to reduce the noise, the ratio “S / D” may be set in a range of 0.025 or less. It can be said.

  Since the configuration and operational effects other than those described above are the same as those in the case of the first embodiment, the description here will be omitted by using the corresponding description of the first embodiment.

<VII: Seventh Embodiment>
11 and 12 show a centrifugal blower X as a seventh embodiment of the blower X according to the present invention. The blower X has the same basic configuration as that of the blower X according to the fourth embodiment, and is different from the blower X on the back side of the front plate 1b from the front plate 1b to the back plate. The point is that a substantially conical cylindrical air blowing guide plate 6 that gradually increases in diameter toward the 1a side is provided so as to wrap around the outer peripheral portion of the impeller Y.

  Thus, by providing the air blowing guide plate 6 so as to wrap the outer periphery of the impeller Y, the passage area of the air blowing port 7 is reduced by the amount of the air blowing guide plate 6 disposed. The mainstream air A1 blown out from the impeller Y is rectified by receiving a contraction action while flowing from the outlet portion of the blade 3 toward the air outlet 7 side. When the rectified mainstream air A1 is blown out from the air outlet 7, the aerodynamic performance of the blower X is improved, and the quiet operation is realized by reducing the operation noise.

  Since the configuration and operational effects other than those described above are the same as those in the case of the fourth embodiment, the description here will be omitted by using the corresponding description of the fourth embodiment.

<VIII: Eighth Embodiment>
FIG. 13 shows a centrifugal blower X as an eighth embodiment of the blower X according to the present invention.

  The blower X has substantially the same configuration of the blower X, the fan casing 1 and the impeller Y according to the fifth embodiment shown in FIG. In place of the annular partition plate 9 described above, an air blowing guide plate (air blowing guide member) 6 having a blowing air flow guide surface in the mixed flow centrifugal direction as shown in the figure is provided, so that a smoother mixed flow centrifugal operation is provided. A blowout airflow A1 in the direction is formed.

  In other words, the air blowing guide plate 6 is an air that narrows the air blowing port 7 of the blower X according to the fifth embodiment described above toward the back plate 1a side (diagonal flow direction) and opens in the centrifugal direction. A partition plate 6b that forms the air outlet 7 and an inclined plate 6a portion that is continuous from the front plate 1b to the upstream portion of the partition plate 6b while being inclined in the diagonal flow centrifugal direction while gradually increasing the inner diameter. ing.

  And the said inclination board 6a part of this air blowing guide board 6 is made to respond | correspond so that the outer periphery of the said ring member 8 of a cross-section L-shape may be covered, The front board 1b side part of the corresponding inclination board 6a is mentioned above. In addition, the air flow outlet 7 side portion functions as a guide surface in the mixed flow centrifugal direction of the main flow A1 blown in the mixed flow centrifugal direction.

As a result, according to the configuration as described above, the passage area of the air outlet 7 is first reduced by the amount of the air blowing guide plate 6, and the mainstream air A <b> 1 blown out from the impeller Y is the outlet portion of the blade 3. Rectified by receiving a contraction action during the flow from the air to the air outlet 7 side. And since this rectified mainstream air A1 is blown out from the said air blower outlet 7, aerodynamic performance improves effectively. And the said inclination board 6a part of this air blowing guide board 6 has the said cross-sectional substantially L shape. Since it corresponds to cover the outer periphery of the ring member 8, the front plate 1b side portion of the corresponding inclined plate 6a is on the guide surface in the circulation direction of the circulation flow A2 described above, and also on the air outlet 7 side. The portion effectively acts as a guide surface of the main flow A1 blown in the mixed flow centrifugal direction in the mixed flow centrifugal direction.

Moreover, in that case the ring member 8, so that the entire circumference of the peripheral surface 8b and guide surface of approximately L-shaped cross section, in the guide surface 8b of the approximately L-shaped cross section, circulation by the Coanda effect as shown A flow is generated, and the circulating flow guides the original circulating flow A2 outside the guide surface more smoothly to the tip of the outer peripheral side of the blade 3 and sucks it more efficiently.

  Therefore, the flow of the circulating flow A2 formed by the ring member 8 described above becomes as smooth as possible, while the suction action of the circulating flow A2 draws and flows from the back plate 1a side to the front plate 1b side. The blowout main flow A1 is also guided more effectively in the oblique flow centrifugal direction, and blown out more smoothly.

  Therefore, the effect of improving the wind speed distribution at the air outlet portion of the blade 3 due to the suction action of the circulating flow A2 described above is further promoted, and further improvement of the blowing performance and reduction of operation noise are realized.

  In addition, when this was confirmed by the experiment similar to the case of FIG. 10 about the reduction effect of this operation noise, the reduction effect of the further blowing sound was confirmed.

  In this case, it is preferable that the arc surface of the outer peripheral surface portion of the ring member 8 is slightly inclined toward the front plate 1b side in the case of the fifth embodiment in correspondence with the presence of the inclined plate 6a. In this way, the circulating flow A2 is more effectively formed.

<Modification>
In the configuration shown in FIG. 13, the shape of the front plate 1 b of the fan casing 1 itself is not changed, and the air blowing guide plate 6 is formed by a box-shaped member whose inside is a cavity. As shown in FIG. 14, the shape of the outer peripheral side of the front plate 1 b of the fan casing 1 may be deformed to form a similar air blowing guide plate 6. Such a configuration has the highest practical performance.

<IX: Ninth Embodiment>
FIG. 15 shows an air conditioner Z according to a ninth embodiment that includes the blower X according to the present invention. This air conditioner Z is a ceiling-embedded air conditioner (indoor unit), which is provided with a casing 20 embedded in the ceiling, a suction port 25 at the center thereof, and an outlet near the outer peripheral edge. In addition, the blower X is disposed in an in-machine space formed by the indoor panel 22 disposed so as to close the lower end opening of the casing 20 so as to face the suction port 25 from above. The heat exchanger 10 is arranged on the outer peripheral side of the blower X. As the blower X, for example, the blower X according to the fourth embodiment is applied.

  In the air conditioner Z having such a configuration, the mainstream air A1 sucked from the suction port 25 by the operation of the blower X is blown from the entire circumference of the blower X, and then heat exchanged in the heat exchanger 10. Then, the air is warmed or cooled, and is blown out from the outlet 26 toward the room interior as indicated by a streamline A3.

  In this case, in this air conditioner Z, a circulating flow A2 is formed around the ring member 8 by the ring member 8 of the impeller Y, and the mainstream air A1 is generated by the suction action of the circulating flow A2. By being drawn toward the ring member 8 side, the wind speed distribution on the outlet side of the blade 3 is improved.

  As a result, it is possible to obtain an air conditioner that maintains high aerodynamic performance of the blower X, suppresses operation noise, and thus has high air conditioning performance.

<X: Other embodiments>
In each of the above embodiments, the case of a centrifugal blower has been described as an example of the blower X. However, of course, the subject of the present invention is not limited to the configuration related to such a centrifugal blower, for example, Of course, the present invention can be applied to the mixed flow fan in exactly the same manner.

  Further, it goes without saying that any of the blowers X of the above embodiments can be arbitrarily applied in configuring the air conditioner Z as described above.

It is sectional drawing which shows the whole structure of the air blower concerning 1st Embodiment of this invention. It is a principal part enlarged view of the air blower. It is principal part sectional drawing of the air blower concerning 2nd Embodiment of this invention. It is principal part sectional drawing of the air blower concerning 3rd Embodiment of this invention. It is sectional drawing which shows the whole structure of the air blower concerning 4th Embodiment of this invention. It is a principal part enlarged view of the air blower. It is principal part sectional drawing of the air blower concerning 5th Embodiment of this invention. It is sectional drawing which shows the whole structure of the air blower concerning the 6th Embodiment of this invention. It is a principal part enlarged view of the air blower. It is noise characteristic explanatory drawing of an air blower. It is sectional drawing which shows the whole structure of the air blower concerning 7th Embodiment of this invention. It is a principal part enlarged view of the air blower. It is sectional drawing which shows the structure of the principal part of the air blower concerning 8th Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the modification of the air blower. It is sectional drawing which shows the whole structure of the air conditioner concerning the 9th Embodiment of this invention.

1 is a fan casing, 2 is a main plate, 3 is a blade, 4 is a fan motor, 5 is a bell mouth, 5a is an air inlet, 6 is an air outlet guide plate, 7 is an air outlet, 8 is a ring member, 8b is a guide Surface, 9 is an annular partition plate, 10 is a heat exchanger, 15 is an annular groove, 16 is a suction guide surface, 17 is a contracted surface, 20 is a casing, 22 is an indoor panel, 25 is a suction port, X is a blower, Y is an impeller and Z is an air conditioner.

Claims (9)

The front plate (1b) is provided with a bell mouth-like air suction port (5a) and an air outlet (7) is provided on the outer periphery thereof, and is arranged at predetermined intervals on the circumference. A large number of blades (3), a circular main plate (2) for supporting and fixing the base end side of each blade (3), and a tip end outer peripheral portion of each blade (3) are provided to form a circulation flow. A blower that houses an impeller (Y) including a ring member (8) having an annular shape,
An annular groove (15) recessed from the peripheral surface (8b) toward the main plate (2) on the entire periphery of the peripheral surface (8b) on the front plate (1b) side of the ring member (8). And providing
Of the peripheral surface (8b), the portion from the inner peripheral side edge of the annular groove (15) to the outer periphery of the tip of each blade (3) is defined as a substantially arcuate surface, which is referred to as a suction guide surface (16). The blower characterized by having done. In claim 1,
The blower characterized in that the ring member (8) is disposed in proximity to the front plate (1b). In claim 1 or 2,
The blower characterized in that the annular groove (15) has a U-shaped cross-sectional shape. In claim 1, 2 or 3,
The front plate (1b) is provided with an annular partition plate (9) extending from the front plate (1b) to the ring member (8) side and having a tip portion entering the annular groove (15). The blower characterized by having. The front plate (1b) is provided with a bell mouth-like air suction port (5a) and an air outlet (7) is provided on the outer periphery thereof, and is arranged at predetermined intervals on the circumference. A large number of blades (3), a circular main plate (2) for supporting and fixing the base end side of each blade (3), and a tip end outer peripheral portion of each blade (3) are provided to form a circulation flow. A blower that houses an impeller (Y) including a ring member (8) having an annular shape,
The entire circumference of the peripheral surface (8b) on the front plate (1b) side of the ring member (8) is a guide surface having a substantially L-shaped cross section,
A blower characterized in that a portion from the inner peripheral side edge of the guide surface (8b) to the tip outer peripheral portion of each blade (3) is formed as a substantially arcuate surface, which is used as a suction guide surface (16) . In claim 5 ,
The front plate (1b) is provided with an annular partition plate (9) extending from the front plate (1b) to the ring member (8) side and having a tip portion close to the guide surface (8b) . A blower characterized by that. In claim 1, 2, 3, 4, 5 or 6,
On the back side of the front plate (1b), an annular air blowing guide member (6) having a blown air flow guide surface in the diagonal flow centrifugal direction from the front plate (1b) to the air outlet (7) side is provided. A blower characterized by being made. In claim 1, 2, 3, 4, 5 or 6,
On the back side of the front plate (1b), a substantially conical cylindrical air blowing guide plate (6) whose diameter gradually increases from the front plate (1b) toward the back plate (1a) is provided on the impeller. A blower characterized by being provided so as to wrap around the outer periphery of (Y). An air conditioner configured by disposing a heat exchanger (10) and a blower (X) in a ventilation path in a casing (20),
An air conditioner using the blower (X) according to claim 1, 2, 3, 4, 5, 6, 7, or 8 as the blower (X).

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