JP2014240633A - Air blower and outdoor unit mounted with air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve input reduction of an air blower and noise reduction of an outdoor unit.SOLUTION: An air blower comprises an impeller and an orifice 8 surrounding a discharge-side outer periphery of a blade of the impeller, a blow-out port 9 which gradually spreads in a discharge direction is provided on a discharge side 8b of the orifice, and a ring-shaped plate 10 is arranged at a position distant from a discharge-side inner wall 8b1 of the orifice substantially radially outside a discharge-side outer peripheral end part of the blade 7 of the impeller. Consequently, air nearby the orifice inner wall on a blade outer peripheral side where air is blown out from the impeller and flow at the highest flow velocity flows while smoothly reduced in velocity. Consequently, dynamic pressure on a blade outer peripheral side is efficiently converted into static pressure while having its loss suppressed to spread, and aerodynamic performance and fan efficiency of the air blower are improved so as to achieve input reduction of the air blower and noise reduction of an outdoor unit.

Description

  The present invention relates to an outdoor unit of a refrigerating apparatus such as an air blower and an air conditioner or a heat pump hot water heater equipped with the air blower.

  In recent years, air conditioners and heat pump water heaters have been rapidly saving energy as a countermeasure against global warming and the like, and low input of equipment has been promoted. On the other hand, it is required to improve the heat exchange performance of indoor and outdoor units such as the heating comfort of air conditioners. In addition to the high performance of heat exchangers, the high efficiency and high performance of indoor and outdoor blowers are also essential. It has become.

  Conventionally, axial blowers or mixed flow blowers have been used as blowers for outdoor units from the viewpoint of large air volume and low noise. However, in order to promote further energy saving of air conditioners and heat pump water heaters, it is necessary to reduce the input to the blower of the outdoor unit, further improving the blowing efficiency of the blower while maintaining a predetermined air volume as the outdoor unit. It is requested to do.

  As the blower of the outdoor unit, the one described in Patent Document 1 can be seen.

  14 to 18 show an outdoor unit for an air conditioner described in Patent Document 1. FIG. As shown in FIGS. 14 and 15, the outdoor unit for an air conditioner includes a main body casing 101 having a rectangular parallelepiped cross section divided into a machine chamber 106 and a heat exchange chamber 107 by a partition plate 105, and the main body casing. 101, an axial flow fan 102 disposed in the heat exchange chamber 107, and an air suction port 103 formed on two sides of the main body casing 101 excluding the casing front plate 101a on the upstream side of the axial flow fan 102, And a heat exchanger 104 having an L-shaped cross-section facing to 103. Reference numeral 108 denotes a compressor disposed in the machine chamber 106 in the main body casing 101.

  On the blowout side of the axial fan 102 in the main body casing 101, a blowout grill 109 comprising a number of crosspieces 110, 110... And vertical bars 111, 111. Is provided. As shown in FIG. 16, the horizontal grills 110, 110... Are arranged at intervals that can prevent finger insertion and constitute the main portion of the blow grill 109, and the vertical rails 111, 111. Is used only for connecting the crosspieces 110, 110. The horizontal rails 110 are configured to have opposite inclinations on one end side and the other end side with respect to the rotational direction M of the axial fan 102 and are arranged at equal intervals.

  That is, as shown in FIG. 17, one end of each crosspiece 110 is twisted by an inclination angle + θ ° in the direction indicated by arrow N1, and the other end of each horizontal crosspiece 110 is inclined by an inclination angle −θ ° in the direction indicated by arrow N2. It is twisted, and the inclination angle of the central part of each crosspiece 110 is 0 °.

  That is, the inclination angle θ in each of the horizontal rails 110 is continuously changed from one end side to the other end side.

  Next, the operation of the outdoor unit for an air conditioner described in Patent Document 1 will be described.

First, the axial fan 102 is driven to rotate, sucking outdoor air from the air suction port 103 of the main body casing 101 through the heat exchanger 104, and guiding the outdoor air to the axial fan 102.
At that time, dynamic pressure and static pressure are added by the axial flow fan 102 to produce a blowing action. Further, when passing through the heat exchanger 104, the compressor 108 is operated to exchange heat with the refrigerant flowing in the pipe of the heat exchanger 104.

  During the operation of the outdoor unit, the air flow W (see FIG. 16) having a swirling component blown out from the axial fan 102 is one end side and the other end with respect to the rotational direction M (see FIG. 16) of the axial fan 102. The ventilation resistance at the time of passing through the horizontal rails 110, 110... Of the blowing grill 109 which is inclined opposite to the side is greatly reduced and the blowing grill 109 is blown out.

  Therefore, even if the distance between the horizontal rails 110, 110,... Is narrow enough to suppress the entry of foreign matter, it is possible to secure the effect of reducing the ventilation resistance of the blow grill 109 and to reduce fan input and noise. Can do. In addition, since the inclination angle θ of each horizontal rail 110 is continuously changed from one end side to the other end side, it becomes easy to correspond to the wind speed distribution of the air flow W blown from the axial fan 102, The effect of reducing the ventilation resistance of the grill 109 can be further increased to reduce fan input and noise.

  Further, as shown in FIG. 18, each crosspiece 110 has a shape that is symmetrical with respect to the cross section axis O when the maximum straight line length in the cross section of the crosspiece 110 is the cross section axis O. Since the separation of the blown air flow can be suppressed smaller than that of the arc shape, the effective flow path area of the blow grill 109 is increased, the effect of reducing the ventilation resistance is increased, and further fan input is reduced and noise is reduced. Reduction can be achieved.

JP 2007-163036 A

  However, in the configuration described in Patent Document 1, fan input is reduced and noise is reduced by reducing the ventilation resistance of the blow grill 109 itself on the front side of the outdoor unit, that is, on the substantially downstream side in the axial direction of the axial fan 102. However, the ventilation resistance generated between the axial fan 102 and the orifice surrounding it cannot be reduced, and there is room for further improvement in reducing fan input and noise.

  That is, in an axial fan used in an outdoor unit such as an outdoor unit of an air conditioner or an outdoor unit of a heat pump water heater, discharge is performed in an oblique outer circumferential direction on the discharge side between the blade having the highest flow velocity and the vicinity of the orifice inner wall. There is also ventilation resistance to the flow, and it is difficult to reduce this ventilation resistance. In particular, this type of indoor unit forms a frame around the blow grill 109 with the crosspieces 110 and the crosspieces that are thicker than the vertical crosspiece 111. There is a problem that it is difficult to increase the resistance and to reduce the input of the axial fan 102 and the noise of the outdoor unit.

  The present invention solves the above-mentioned conventional problems, and provides a blower that improves aerodynamic performance and fan efficiency as a blower, reduces input of the blower and reduces noise as an outdoor unit, and an outdoor unit equipped with the blower It is.

In order to solve the above conventional problems, a blower of the present invention includes an impeller comprising a hub connected to a motor and a plurality of blades disposed around the hub, and an outer periphery on the discharge side of the plurality of blades. The discharge side of the orifice has a blow-out opening that gradually expands in the discharge direction, and is separated from the discharge-side inner wall of the orifice substantially outside the outer peripheral end of the discharge side of the blade. In this configuration, a ring-shaped plate is arranged at a certain position.

  With this configuration, when the flow near the inner wall of the orifice on the outer peripheral side of the blade, which is blown out from the impeller and has the highest flow velocity, blows out along the vicinity of the inner wall of the orifice discharge side that gradually expands in the discharge direction, A part flows between the orifice discharge side inner wall and the ring-shaped plate to form a high-speed jet, and this high-speed jet flows on the side opposite to the orifice side of the ring-shaped plate from the blade outer peripheral side toward the discharge direction. Since the main stream that gradually spreads is attracted, the main stream flows while smoothly decelerating while adhering to the ring-shaped plate. That is, the dynamic pressure on the outer peripheral side of the blade is efficiently converted to a static pressure while suppressing loss and spreads out. Therefore, the airflow resistance generated between the impeller and the orifice is reduced, and further, the flow in the oblique outer peripheral direction in the vicinity of the inner wall on the orifice discharge side is promoted to improve the aerodynamic performance and the fan efficiency as the blower. Input reduction and noise reduction as an outdoor unit can be achieved.

  The present invention reduces the ventilation resistance generated between the impeller and the orifice, further promotes the flow in the oblique outer peripheral direction near the inner wall on the orifice discharge side, and improves the aerodynamic performance and fan efficiency as a blower, It is possible to reduce the input of the blower and the noise of the outdoor unit.

The meridional sectional view of the blower in Embodiment 1 of the present invention The expanded sectional view of the blade outer periphery principal part of the air blower in Embodiment 1 The perspective view of the outdoor unit of the air conditioner carrying the air blower in Embodiment 1 The expanded sectional view of the blade outer periphery principal part of the air blower in Embodiment 2 The meridional section of the blower in the third embodiment The perspective view of the outdoor unit of the air conditioner which mounts the air blower in Embodiment 3 Meridian cross-sectional view of a blower in Embodiment 4 of the present invention The expanded sectional view of the blade outer periphery principal part of the air blower in Embodiment 4 The perspective view of the outdoor unit of the air conditioner which mounts the air blower in Embodiment 4 Enlarged sectional view of the outer periphery of the blade according to the fifth embodiment Meridian cross-sectional view of the blower in the sixth embodiment The perspective view of the outdoor unit of the air conditioner carrying the air blower in Embodiment 6 The figure which shows the aerodynamic characteristic and efficiency characteristic of the air blower in the same Embodiment 5 and 6 and the conventional air blower Front view of conventional outdoor unit for air conditioner Cross-sectional plan view of a conventional outdoor unit for an air conditioner An enlarged perspective view in which a part of a blowout grill portion in a conventional outdoor unit for an air conditioner is cut out. An enlarged perspective view of a cross beam constituting a blow-out grill in a conventional outdoor unit for an air conditioner The expanded sectional view of the crosspiece which comprises the blowing grill in the conventional outdoor unit for air conditioners

A first invention comprises an impeller comprising a hub connected to a motor and a plurality of blades disposed around the hub, and an orifice surrounding the outer periphery of the discharge side of the plurality of blades. The side has a blower outlet that gradually expands in the discharge direction, and a ring-shaped plate is arranged at a position away from the discharge-side inner wall of the orifice on the substantially radial outer side of the outer peripheral end of the blade on the discharge side. As a configuration.

  As a result, when the flow in the vicinity of the orifice inner wall on the outer peripheral side of the blade, which is blown out from the impeller and becomes the fastest, blows out along the vicinity of the inner wall of the orifice discharge side that gradually spreads in the discharge direction, a part of the airflow is It flows between the inner wall of the orifice discharge side and the ring-shaped plate and becomes a high-speed jet, and this high-speed jet gradually spreads from the outer periphery of the blade toward the discharge direction on the side opposite to the orifice side of the ring-shaped plate Since the flowing main stream is attracted, the main stream flows while smoothly decelerating while adhering to the ring-shaped plate. That is, the dynamic pressure on the outer peripheral side of the blade is efficiently converted to a static pressure while suppressing loss and spreads out. Therefore, it does not become resistance to ventilation in the direction of the slant outer periphery near the inner wall on the orifice discharge side, promotes flow, improves aerodynamic performance and fan efficiency as a blower, reduces input of the blower, and noise as an outdoor unit. Reduction can be achieved.

  According to a second aspect of the present invention, the discharge-side outer peripheral end of the blade extends radially toward the discharge side of the blade so as to maintain a substantially constant gap along the inner wall of the orifice on the discharge side, and the extended outer periphery The ring-shaped plate is arranged on the outer periphery of the end portion in a substantially radial direction.

  As a result, in addition to the first invention, the discharge side outer peripheral end of the blade maintains a substantially constant gap with the discharge side inner wall of the orifice, so that leakage from the pressure surface side to the negative pressure surface side is suppressed, and the outer peripheral end Since the peripheral speed is increased by extending the portion in the substantially radial direction, the flow velocity of the airflow blown out along the vicinity of the orifice discharge side inner wall gradually spreading in the discharge direction from the outer peripheral end portion is further increased. As a result, the speed of the jet flow between the downstream end of the ring-shaped plate and the inner wall of the orifice is increased, and it is attracted by the jet flow to discharge the opposite side of the ring-shaped plate from the orifice end from the outer peripheral edge of the blade. The main stream flowing so as to spread in the direction is also accelerated, and the air volume can be increased. Therefore, the aerodynamic performance as a blower can be further improved, the rotational speed of the impeller when a predetermined air volume is required can be significantly reduced, and the input reduction effect and noise reduction effect of the blower can be further increased. .

  In a third aspect of the present invention, the distance between the upstream end and the downstream end of the ring-shaped plate between the orifice and the inner wall on the discharge side is substantially constant.

  As a result, in addition to the first and second inventions, the main ring-shaped ring flows so as to gradually spread from the outer peripheral edge of the blade toward the discharge direction on the side opposite to the orifice side of the ring-shaped plate attracted by the jet. Collision with the upstream end of the plate can be suppressed. As a result, it is possible to further suppress the flow resistance of the flow toward the oblique outer periphery in the vicinity of the inner wall on the orifice discharge side, and to further increase the input reduction effect and noise reduction effect of the blower.

  In a fourth aspect of the present invention, the distance between the ring-shaped plate and the inner wall on the discharge side of the orifice is configured such that the upstream end of the ring-shaped plate is wider than the downstream end.

  As a result, in addition to the first and second inventions, the distance from the inner wall of the orifice decreases from the upstream end of the ring-shaped plate toward the downstream end of the ring-shaped plate, so that the downstream of the ring-shaped plate. The speed of the jet from between the end and the inner wall of the orifice is further increased. Further, the main stream that is attracted by the jet and flows so as to gradually spread from the outer peripheral edge of the blade toward the discharge direction on the side opposite to the orifice side of the ring-shaped plate also wraps around the upstream end of the ring-shaped plate, so that the discharge side shaft As a result, the axial and swirl direction components are increased, the static pressure recovery is further improved, and the input reduction effect and noise reduction effect of the blower can be further increased.

5th invention consists of a main body housing | casing, the air blower arrange | positioned inside the said main body housing | casing, and the blowing grill arrange | positioned at the discharge side of the said air blower, and the said air blower is either 1st-4th invention. The outdoor unit is characterized in that a blower and a ring-shaped plate of the blower are configured by a part of an outer frame portion of the blowout grill.

  As a result, the air flow blown out along the vicinity of the orifice discharge side inner wall of the blowout outlet is blown out as a high-speed jet from between the downstream end of the ring-shaped plate composed of the outer frame part of the blowout grill and the inner wall of the orifice. Since the main flow that is attracted by the jet flow and gradually spreads from the outer peripheral edge of the blade toward the discharge direction on the side opposite to the orifice side of the ring-shaped plate adheres to the ring-shaped plate, it flows while smoothly decelerating. Reduces ventilation resistance, further promotes the flow in the oblique outer periphery near the inner wall of the orifice discharge side, improves the aerodynamic performance and fan efficiency of the blower installed in the outdoor unit, reduces the input of the blower and the outdoor unit Noise can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a meridional cross-sectional view of a blower according to Embodiment 1 of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of a blade outer periphery of the blower, and FIG. 3 is a perspective view of an indoor unit equipped with the blower.

  In FIG. 1 to FIG. 3, reference numeral 1 denotes a main body casing of an outdoor unit, and an axial flow type blower 2 is mounted inside the main body casing 1. Reference numeral 3 denotes an impeller of the blower 2, which is configured by providing a plurality of blades 7 radially on a substantially cylindrical hub 6 fixed to the shaft 5 of the motor 4. Reference numeral 8 denotes an orifice having an appropriate shape along the rotation trajectory of the outer peripheral end 7e of the blade 7 of the blower 2 so as to surround the discharge side 7b of the blade 7.

  The orifice 8 has a discharge port 9 that gradually expands in the discharge direction on the discharge side 8b, and a ring-shaped plate 10 that is substantially radially outward and obliquely behind the outer peripheral end 7e of the discharge side 7b of the blade 7. Is arranged.

  The ring-shaped plate 10 is disposed at a position away from the inner wall 8b1 on the discharge side 8b of the orifice 8. In this embodiment, the upstream end 10a and the downstream end 10b and the inner wall 8b1 on the discharge side 8b of the orifice 8 The cross section in which the distances S1 and S2 between them are substantially constant is arcuate. For example, in the first embodiment, when the outer diameter d2 of the impeller 3 is φ435 mm, S1 and S2 are about 1 mm.

  A blower grill 11 is installed on the blower direction surface side of the blower 2 in the main body housing 1 of the outdoor unit. As shown in FIG. 3, the blow grill 11 includes concentric bars 11a and radial bars 11b on the front side of the blower 2, and an outer frame portion 11c corresponding to the outermost periphery of the blow grill, and has a concentric outer frame. The portion 11c is provided with a plurality of substantially ring-shaped plates 11d, and the ring-shaped plate closest to the discharge side 8b of the orifice 8 becomes the ring-shaped plate 10 of the blower 2 described above.

  About the air blower comprised as mentioned above and the outdoor unit in which the air blower is mounted, the operation | movement and an effect | action are demonstrated below.

First, the impeller 3 is rotationally driven by the motor 4 to guide outdoor air into the impeller 3 through an outdoor heat exchanger (not shown) in the main body housing 1. At that time, dynamic pressure and static pressure are applied by the plurality of blades 7 and the orifices 8 provided around the blades 7 to perform a blowing action. Further, when passing through the outdoor heat exchanger, heat is exchanged with the refrigerant flowing in the pipe of the outdoor heat exchanger by the operation of a compressor (not shown).

  As shown in FIG. 2, in the semi-open side axial flow or mixed flow type impeller 3 where the suction side is not surrounded by the orifice 8, the suction side is surrounded by the orifice 8 as well as the upstream side of the impeller 3. The air flow is sucked in between the blades of the impeller 3 even from the outer periphery, and the flow in the vicinity of the inner wall of the orifice 8 on the outer peripheral side 7c of the blade 7 where the flow velocity becomes the fastest is gradually expanded in the discharge direction. When the air blows out along the vicinity of the inner wall of the discharge side 8b, a downstream end 10b of the ring-shaped plate 10 along the inner wall 8b1 of the orifice 8 and a part of the air flow W2 spread along the discharge side 8b and the inner wall 8b1 of the orifice 8 It becomes a high-speed jet W3 from between. On the other hand, the main flow W1 that gradually spreads in the discharge direction from the outer peripheral end 7e side of the blade 7 in the air flow W2 is attracted to the jet flow W3 and is opposite to the orifice 8 side of the ring-shaped plate 10. It flows while smoothly decelerating while adhering to the ring-shaped plate 10 on the side. That is, the dynamic pressure at the outer peripheral end 7e of the blade 7 is efficiently converted into a static pressure while suppressing spreading loss.

  As a result, the flow in the vicinity of the orifice on the outer peripheral side of the blade, that is, the flow in the oblique outer peripheral direction in the vicinity of the inner wall of the discharge side 8b of the orifice 8 does not become a draft resistance, promotes the flow, and aerodynamic performance and fan as the blower 2 Efficiency can be improved and the input reduction of the air blower 2 and the ventilation noise reduction as an outdoor unit can be aimed at.

  Further, by making the distance between the upstream end 10a of the ring-shaped plate 10 and the inner wall of the discharge side 8b of the orifice 8 from the downstream end 10b substantially constant, the orifice 8 of the ring-shaped plate 10 attracted by the jet W3. Collision with the upstream end 10a of the ring-shaped plate 10 of the main flow W1 that flows so as to gradually spread from the blade outer peripheral side toward the discharge direction on the side opposite to the side can be suppressed.

  As a result, it is possible to further suppress the ventilation resistance of the flow in the oblique outer circumferential direction near the inner wall of the discharge side 8b of the orifice 8, and to reduce the input of the blower 2 and the blowing noise as the outdoor unit.

(Embodiment 2)
FIG. 4 shows a blower according to the second embodiment. The blower according to the second embodiment increases the jet flow from between the ring-shaped plate 10 described in the first embodiment and the inner wall 8b1 on the discharge side 8b of the orifice 8. It is designed to speed up.

  Hereinafter, although it demonstrates using FIG. 4, about the same component as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different part is demonstrated.

  As shown in FIG. 4, the ring-shaped plate 10 according to the second embodiment has a distance S1 between the upstream end 10a and the inner wall 8b1 of the discharge side 8b of the orifice 8 so that the inner wall of the discharge end 8b of the downstream end 10b and the orifice 8 It is set wider than the distance S2 with 8b1. For example, in the second embodiment, when the outer diameter d2 of the impeller 3 is φ435 mm, S1 is about 3.5 mm and S2 is about 1 mm.

By setting it as such a structure, the distance between the inner end 8b1 of the discharge side 8b of the orifice 8 becomes small so that it goes to the downstream end 10b from the upstream end 10a of the ring-shaped board 10, The ring-shaped board 10 The speed of the jet W3 from between the downstream end 10b of the nozzle and the inner wall 8b1 of the orifice 8 is further increased. The main flow W1 that is attracted by the jet W3 and flows so as to gradually spread from the outer peripheral end 7e of the blade 7 toward the discharge direction on the side opposite to the orifice 8 side of the ring-shaped plate 10 is also upstream of the ring-shaped plate 10. Since it goes around the end 10a, it is directed in the discharge side axial direction, and the axial direction / swirl direction component is increased and the static pressure recovery is further improved. Therefore, the aerodynamic performance and fan efficiency as the blower 2 can be further improved, and the input of the blower 2 can be reduced and the blowing noise as the outdoor unit can be reduced.

(Embodiment 3)
5 and 6 show the blower in the third embodiment and the indoor unit in which the blower is mounted. In the third embodiment, the outer frame portion 11c of the blowout grill 11 has a substantially square shape, and is most disposed on the discharge side 8b of the orifice 8. The ring-shaped plate 10 of the blower 2 is used as the near ring-shaped plate, and the function and effect thereof are the same as those of the first embodiment, and the description thereof is omitted.
(Embodiment 4)
FIG. 7 is a meridional cross-sectional view of a blower according to Embodiment 4 of the present invention, FIG. 8 is an enlarged cross-sectional view of the main part of the blade outer periphery of the blower, and FIG. 9 is a perspective view of an indoor unit equipped with the blower.

  In the fourth embodiment, the discharge side outer peripheral end portion 12 of the blade 7 of the blower 2 is more radially directed toward the discharge side 7b of the blade 7 so as to maintain a substantially constant gap along the inner wall of the discharge side 8b of the orifice 8. A ring-shaped plate 10 is arranged at a position away from the inner wall 8b1 of the discharge side 8b of the orifice 8 on the outer periphery end portion 12 of the discharge side outer peripheral end 12 that is extended and extended. Other configurations are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are given and description thereof is omitted.

  According to the configuration of the fourth embodiment, the discharge-side outer peripheral end 12 of the blade 7 maintains a substantially constant gap with the discharge-side 8b inner wall 8b1 of the orifice 8, so that the pressure-side of the discharge-side outer peripheral end 12 is maintained. The orifice 8 is gradually spread in the discharge direction from the discharge-side outer peripheral end portion 12 by increasing the peripheral speed by extending the discharge-side outer peripheral end portion 12 in a substantially radial direction. The flow velocity of the air flow W5 blown out along the vicinity of the inner wall of the discharge side 8b is further increased.

  As a result, the speed of the jet W6 from between the downstream end 10b of the ring-shaped plate 10 and the inner wall 8b1 of the orifice 8 is increased, and is attracted by the jet W6 to the opposite side of the ring-shaped plate 10 from the orifice 8 side. The main flow W4 flowing so as to gradually spread from the discharge-side outer peripheral end 12 of the blade 7 toward the discharge direction is also increased, so that the air volume can be increased.

  Accordingly, the aerodynamic performance as the blower 2 can be further improved, and the rotational speed of the impeller 3 when a predetermined air volume is required can be greatly reduced. The input reduction effect of the blower 2 and the blowing noise as the outdoor unit The reduction effect can be further increased.

  Other functions and effects are the same as those of the first embodiment, and a description thereof will be omitted.

(Embodiment 5)
FIG. 10 shows a blower according to the fifth embodiment. The blower according to the fifth embodiment generates a jet flow between the ring-shaped plate 10 described in the fourth embodiment and the inner wall 8b1 on the discharge side 8b of the orifice 8. Similar to the second embodiment, the speed is increased.

  Hereinafter, although it demonstrates using FIG. 10, about the same component as Embodiment 4, the same code | symbol is attached | subjected and description is abbreviate | omitted and only a different part is demonstrated.

  In the ring-shaped plate 10 in the fifth embodiment, the distance S1 between the upstream end 10a of the ring-shaped plate 10 and the inner wall 8b1 on the discharge side 8b of the orifice 8 is the same as in the second embodiment. 8 is arranged in a state wider than the distance S2 with the inner wall 8b1 of the discharge side 8b. For example, as in the second embodiment, when the outer diameter d2 of the impeller 3 is φ435 mm, S1 is about 3.5 mm and S2 is about 1 mm.

By adopting such a configuration, as described in the second embodiment, the ring-shaped plate 1
The speed of the jet W5 from between the 0 downstream end 10b and the inner wall 8b1 of the orifice 8 is further increased. The main flow W4 that is attracted by the jet W5 and flows so as to gradually spread from the outer peripheral end portion 7e of the blade 7 toward the discharge direction on the opposite side of the orifice 8 of the ring-shaped plate 10 is also upstream of the ring-shaped plate 10. Since it goes around the end 10a, it is directed in the discharge side axial direction, and the axial direction / swirl direction component is increased and the static pressure recovery is further improved. Therefore, the aerodynamic performance and fan efficiency as the blower 2 can be further improved, and the input of the blower 2 can be reduced and the blowing noise as the outdoor unit can be reduced.

  FIG. 13 shows the aerodynamic performance and efficiency characteristics of the blower 2 in the fourth and fifth embodiments, in which a blower in which an outer peripheral end on the discharge side is not extended in a substantially radial direction and an orifice are combined. (This is referred to as a conventional product). In addition, in FIG. 13, the numerical value evaluated by the impeller outer diameter d2 = 435 mm is shown as non-dimensional.

  As is apparent from FIG. 13, the components of Embodiments 4 and 5 of FIGS. 8 and 10 both have the same flow coefficient, a higher pressure coefficient, and improved aerodynamic characteristics compared to the conventional products. Especially when the flow coefficient is low, it shows a higher pressure coefficient than the conventional product. Further, fan efficiency (static pressure) is improved as the blower 2, and when driven near the maximum efficiency point, the input of the motor 4 can be reduced.

(Embodiment 6)
FIGS. 11 and 12 show the blower in the sixth embodiment and the indoor unit in which the blower is mounted. In the sixth embodiment, the outer frame portion 11c of the blowout grill 11 is substantially rectangular as in the third embodiment, and the orifice 8 The ring-shaped plate closest to the discharge side 8b is the ring-shaped plate 10 of the blower 2. The operational effect is the same as that of the fourth embodiment, and the description thereof is omitted.

  As described above, the blower and the outdoor unit according to each of the embodiments have the highest flow velocity in the axial flow or mixed flow impeller used in the outdoor unit of the air conditioner or the unit of the heat pump water heater. When the flow in the vicinity of the orifice 8 on the outer peripheral side of the blade 7 blows out along the vicinity of the orifice discharge side inner wall of the blowout port 9 that gradually spreads in the discharge direction, a part of the air flow of the ring-shaped plate 10 along the inner wall of the orifice A main stream that is ejected as a high-speed jet from between the downstream end and the inner wall of the orifice 8 and flows so as to gradually spread from the outer peripheral side of the blade toward the discharge direction on the side opposite to the orifice side of the ring-shaped plate 10 induced by the jet. Flows smoothly while decelerating while adhering to the ring-shaped plate 10, so that air resistance does not occur, and further, in an oblique outer circumferential direction near the inner wall on the orifice discharge side It is possible to facilitate the flow. Therefore, the improvement of the ventilation efficiency of an outdoor unit and the high heat exchange capability as a heat pump unit can be compatible, and further noise reduction can be achieved.

  As described above, the present invention can achieve both improvement in the ventilation efficiency of the outdoor unit and high heat exchange capability as a heat pump unit, and further enables low noise. It can be applied not only to refrigeration and refrigeration equipment such as refrigerators for refrigerators and vending machines, heat pump equipment such as water heaters, and electronic equipment having thermoelectric components, but also to AV equipment and waste heat recovery equipment.

DESCRIPTION OF SYMBOLS 1 Main body housing 2 Blower 3 Impeller 4 Motor 6 Hub 7 Blade 7b Discharge side 7e Outer peripheral edge 8 Orifice 8b Discharge side 9 Outlet 10 Ring-shaped plate 10a Upstream end 10b Downstream end 11 Outlet grill 11c Outer frame 12 Discharge Side outer edge

Claims (5)

An impeller comprising a hub connected to a motor and a plurality of blades arranged around the hub, and an orifice surrounding the outer periphery of the discharge side of the plurality of blades, the discharge side of the orifice facing the discharge direction A blower characterized in that a ring-shaped plate is disposed at a position distant from the inner wall on the discharge side of the orifice, on the substantially outer side in the radial direction of the outer peripheral end portion on the discharge side of the blades. . The discharge side outer peripheral end of the blade extends radially toward the discharge side of the blade so as to maintain a substantially constant gap along the inner wall on the discharge side of the orifice, and the further outer peripheral end of the extended outer peripheral end further extends in the radial direction. The blower according to claim 1, wherein a ring-shaped plate is arranged. The blower according to claim 1 or 2, wherein the distance between the upstream end and the downstream end of the ring-shaped plate between the orifice and the inner wall on the discharge side is substantially constant. The blower according to claim 1 or 2, wherein the distance between the ring-shaped plate and the inner wall on the discharge side of the orifice is wider at the upstream end of the ring-shaped plate than at the downstream end. It consists of a main body housing, a blower disposed inside the main body housing, and a blowing grill disposed on the discharge side of the blower, wherein the blower is the blower according to any one of claims 1 to 4, The outdoor unit characterized in that the ring-shaped plate of the blower is constituted by a part of the outer frame portion of the blow-out grill.

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