JP3846468B2 - Turbo fan - Google Patents

Description

  The present invention relates to a turbofan, and more particularly to measures for improving the cooling efficiency of a motor that is a drive source of the turbofan.

  Conventionally, an air conditioner installed on a ceiling is known. As this type of air conditioner, for example, a ceiling-embedded type embedded in an opening formed in the ceiling surface as disclosed in Patent Document 1, or a ceiling-suspended type directly installed on the ceiling surface There is something.

  In general, a ceiling-embedded type has a turbo fan inside the casing, and after adjusting the temperature of the indoor air sucked from the lower surface of the casing as the fan is driven by a heat exchanger, for example, indoors from four directions of the casing. I try to blow it out.

  The arrangement state of the turbo fan in this type of air conditioner will be described with reference to FIG. As shown in this figure, the turbofan (a) is supported by a motor (e) attached to the top plate (g) of the device casing, and includes an end plate (b), a shroud (c), and this end plate. a plurality of blades (d) held between the lower surface of (b) and the upper surface of the shroud (c). The end plate (b) is formed of a circular plate material, and a central portion is bulged downward, and a housing space for the motor (e) is formed above the bulged portion. A plurality of openings (h, h) are formed through the central portion of the end plate (b). The shroud (c) is made of a circular plate having an air introduction opening (c1) at the center, and is curved downward as it goes toward the inner periphery. With such a configuration, an air passage (f) is formed between the end plate (b) and the shroud (c) in the turbo fan (a).

  During operation of the air conditioner, a part of the air blown out from the blower outlet of the turbo fan (a) goes around the upper surface of the end plate (b) to cool the motor (e) (see arrow D in FIG. 7). . Thereafter, this air passes through the opening (h) in the central portion of the end plate (b) and is collected in the air passage (f). In this way, the motor (e) is cooled.

On the other hand, the ceiling-suspended type has a sirocco fan inside the casing, and after adjusting the temperature of the indoor air sucked into the casing as the fan is driven by a heat exchanger in the same manner as described above, It blows out indoors. That is, in the ceiling suspension type, a form in which conditioned air is blown out from only one direction on the front surface of the casing is common.
JP-A-8-75240

  The inventor of the present invention considered that air-conditioned air can be blown out from a plurality of directions even in a ceiling-suspended air conditioner. In that case, it is conceivable to adopt the same configuration as that of the above-described ceiling-embedded type.

  However, in the ceiling suspended type, the height of the device is the protruding size from the ceiling surface as it is, so when the height of the device is large, it appears to protrude greatly downward from the ceiling surface. bad. In the case of the ceiling-embedded type, the majority of the device is located in the space behind the ceiling, and the protruding dimension to the indoor side is essentially small, so the device height is currently designed with little consideration. is there. Therefore, it is not practical to apply the conventional ceiling-embedded type as it is to the ceiling-suspended type. For this reason, in order to put the ceiling-suspended type capable of blowing out the conditioned air from a plurality of directions, it is necessary to reduce the thickness of the entire apparatus.

  As a means for reducing the thickness of the apparatus, the distance between the casing top plate (g) and the end plate (b) (dimension t in FIG. 7) is set to be small, that is, the turbofan (a) is connected to the casing top plate ( It can be considered to be placed close to g).

  However, when such a means is adopted, the air flow area for cooling the motor (e) is reduced, which hinders the cooling performance and may cause the motor (e) to fail. It will be high.

  In addition, it is not limited to the ceiling-suspended type, and even if it is a ceiling-embedded type, reducing the thickness does not limit the ceiling space (can be installed in a narrow ceiling space) So it is effective.

  The present invention has been made in view of these points, and an object of the present invention is to reduce the thickness of the entire apparatus while maintaining the cooling performance of the motor by improving the shape of the turbofan.

  In order to achieve the above object, the present invention improves the cooling efficiency of the motor by agitating the air around the motor with the ribs provided on the end plate, and thereby the distance between the casing top plate and the end plate. Enabled to be set small.

A first invention is a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between front surfaces. It is targeted. The central portion of the end plate (21) bulges to the shroud (20) side, and a motor housing space is formed on the back side thereof, and a drive shaft (25a) of the motor (25) is formed at the central portion of the bulged portion. ) Is formed around the boss portion (24) of the end plate (21) and flows around the boss portion (24) of the end plate (21) on the back side of the end plate (21). An opening (30, 30,...) Is formed on the front side of the end plate (21) to cool the air that has cooled 25), and the boss portion (24) is formed on the back surface of the end plate (21). A plurality of ribs (27, 27,...) Extending radially from the center project in a state of being continuous with the boss portion (24), and the plurality of ribs (27, 27,...) with the ends of which protrude from the end face of the boss portion (24), towards respective heights from the outer peripheral surface of the boss portion (24) to the outer peripheral side of the end plate (21) It is one that has become increasingly low.

A second invention is a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between front surfaces. It is targeted. The central portion of the end plate (21) bulges to the shroud (20) side, and a motor housing space is formed on the back side thereof, and a drive shaft (25a) of the motor (25) is formed at the central portion of the bulged portion. ) Is formed around the boss portion (24) of the end plate (21) and flows around the boss portion (24) of the end plate (21) on the back side of the end plate (21). An opening (30, 30,...) Is formed on the front side of the end plate (21) to cool the air that has cooled 25), and the boss portion (24) is formed on the back surface of the end plate (21). A plurality of ribs (27, 27,...) Extending radially from the center are projected from the boss portion (24), and the projecting end surfaces of the ribs (27, 27,...) Face each other. It is located between the end surface of the motor (25) and the end surface of the boss portion (24), and the height of each rib (27, 27, ...) is increased from the outer peripheral surface of the boss portion (24) to the end plug. The rate gradually decreases toward the outer periphery of the rate (21) .

A third invention is a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between front surfaces. It is targeted. A central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. A drive shaft (25a) of the motor (25) is formed at the central portion of the bulged portion. ) Is formed around the boss portion (24) of the end plate (21) and flows around the boss portion (24) of the end plate (21) on the back side of the end plate (21). An opening (30, 30,...) Is formed on the front side of the end plate (21) to cool the air that has cooled 25), and the boss portion (24) is formed on the back surface of the end plate (21). A plurality of ribs (27, 27,...) Extending radially from the center project in a state of being continuous with the boss portion (24), and the plurality of ribs (27, 27,...) end protrudes from the end surface of the boss portion (24) of gradually respective height toward the outer peripheral surface of the boss portion (24) to the outer peripheral side of the end plate (21) With Kunar, in which each is formed so as to overlap the opening (30, 30, ...) and in the circumferential direction of the end plate (21).

A fourth invention is a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between front surfaces. It is targeted. The central portion of the end plate (21) bulges to the shroud (20) side, and a motor housing space is formed on the back side thereof, and a drive shaft (25a) of the motor (25) is formed at the central portion of the bulged portion. ) Is formed on the periphery of the boss (24) in the end plate (21) on a circumference concentric with the boss (24). a plurality of openings (30, 30, ...) are formed on the back surface of the end plate (21), a plurality of ribs extending radially above the boss portion (24) as the center (27, 27, ...) is the projecting in a continuous state on the boss portion (24), said plurality of ribs (27, 27, ...), together with the ends of the respective inner peripheral side protrudes from the end surface of the boss portion (24), respectively Is gradually decreased from the outer peripheral surface of the boss portion (24) toward the outer peripheral side of the end plate (21) .

  In each of the first to fourth inventions, the air around the motor (25) is agitated by the ribs (27, 27,...) As the turbo fan rotates. For this reason, the cooling efficiency of the motor (25) is increased, and when this turbofan is installed in a ceiling-mounted air conditioner, the distance between the top plate of the device casing and the end plate (21) is set small. Even if it does, the cooling performance of a motor will be maintained favorable.

  In the present invention, ribs (27, 27,...) Are provided on the rear surface of the end plate (21) of the turbofan, and the air around the motor (25) is agitated by the ribs (27, 27,...). As a result, the cooling efficiency of the motor (25) can be improved. For this reason, when this turbofan is installed in a ceiling-mounted air conditioner, the cooling performance of the motor (25) is not limited even if the distance between the top plate of the device casing and the end plate (21) is set small. As a result, the apparatus can be thinned and the cooling performance of the motor (25) can be ensured.

  Next, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, a case where the present invention is applied to a ceiling-suspended air conditioner will be described.

  FIG. 1 is a perspective view of an air conditioner (1) according to the present embodiment, FIG. 2 is a plan view showing the internal structure of the air conditioner (1), and FIG. 3 is a longitudinal sectional view thereof.

  As shown in these figures, this air conditioner (1) is a box-shaped air outlet (2A, 2B, 2C, 2D) that is installed on the ceiling surface (A) and opens horizontally on four sides. A casing (3) is provided. Inside the casing (3), there are a heat exchanger (4) configured in an annular shape so as to face each air outlet (2A, 2B, 2C, 2D) and a resin-made turbocharger located at the center of the casing. A fan (5) is housed. Each air outlet (2A, 2B, 2C, 2D) is provided with a horizontal blade (6) for adjusting the air direction of the conditioned air into the room so as to be rotatable about a horizontal axis.

  A suction grill (8) having an air suction port (7) at the center is attached to the lower surface of the casing (3) so as to be freely opened and closed. In FIG. 3, (9) is an air filter for removing dust and the like in the intake air.

  The heat exchanger (4) is a cross fin type in which a large number of plate-like fins are attached in an orthogonal state to a plurality of heat transfer tubes arranged in parallel to each other, and is used as an evaporator during cooling operation. It functions as a condenser during operation. As a result, the temperature of the air derived from the turbo fan (5) is adjusted.

  In addition, a drain pan (10) for collecting drain water generated in the heat exchanger (4) is disposed below the heat exchanger (4).

  A pipe space (12A) partitioned by a partition plate (11) with respect to the internal space of the casing is formed at one corner (the lower right corner in FIG. 2) in the casing (3). . In this piping space (12A), there are suspension fittings (15A) for suspending the refrigerant piping (13), the drain pump (14), the casing (3) from the concrete member in the ceiling space with the suspension bolts, etc. Has been placed. The piping space (12A) is covered with a corner cover (16A) that is detachable from the casing (3). Also, spaces (12B, 12C, 12D) partitioned by a heat insulating material (17) with respect to the internal space of the casing are formed at the other three corners. In each of these spaces (12B, 12C, 12D), suspension fittings (15B, 15C, 15D) are arranged, and each is covered with a corner cover (16B, 16C, 16D). These corner covers (16A to 16D) ensure a good appearance of the air conditioner (1).

  Hereinafter, the turbo fan (5) will be described. 4 is a plan view of the turbo fan (5), FIG. 5 is a bottom view of the turbo fan, and FIG. 6 is a cross-sectional view taken along line ZZ in FIG. The turbofan (5) includes a circular end plate (21), a circular shroud (20) having an air introduction opening (20a) in the center, and a blade held between the two (20, 21). (22). The blade (22) is made of a plate member having a cross-sectional wing shape that inclines counterclockwise as it goes toward the outer periphery in FIG. A central portion of the end plate (21) bulges downward and is configured as a hub portion (23). Due to this bulge, a housing space for the motor (25) is formed above the hub portion (23). A cylindrical boss portion (24) as an attachment portion in the present invention is integrally formed at the center portion of the hub portion (23). The boss portion (24) is directly connected to the lower end portion of the drive shaft (25a) of the motor (25) disposed in the central portion of the casing (3). Specifically, the boss portion (24) has a metallic first ring (24b), a vibration isolating rubber (24c), and a metal second ring (24d) inside the cylindrical boss body (24a). The opening (24e) for fitting the drive shaft (25a) of the motor (25) is formed at the center of the second ring (24d). The drive shaft (25a) of the motor (25) is fitted into this opening (24e), and the nut (N) is screwed from the lower side, so that the turbo fan (5) is rotated and integrated with the drive shaft (25a). It is attached (see FIG. 3). As a result, the entire turbo fan (5) rotates (rotates clockwise in FIG. 4) as the motor (25) is driven, and the air sucked from the lower side of the turbo fan (5) is blown radially outward. It comes out.

  A bell mouth (26) for guiding indoor air to the turbo fan (5) is disposed below the turbo fan (5). The bell mouth (26) has an opening (26a) slightly smaller than the opening (20a) of the shroud (20) at the center. The edge of the opening (26a) has an arcuate cross section so that air can flow smoothly to the turbo fan (5).

  Further, the hub portion (23) is formed with eight openings (30, 30,...) Formed of long holes on eight concentric circles centering on the boss portion (24). This opening (30, 30,...) Allows a part of the air blown out from the outer periphery of the turbo fan (5) to go around the back side of the end plate (21) and introduce it around the motor (25). When the heat is taken away from this, the air is again discharged to the lower side of the hub portion (23) (see arrow B in FIG. 3). That is, the motor (25) is cooled by the wraparound of air.

  As a characteristic feature of this embodiment, a plurality of resin ribs (27, 27,...) Project from the upper surface of the hub portion (23). These ribs (27, 27,...) Are arranged radially about the boss portion (24). Specifically, it is formed at eight positions between the openings (30, 30,...), The inner end is located on the upper surface of the boss portion (24), and the outer end is in the longitudinal direction of the opening (30). It is located facing the substantially central portion. By providing the ribs (27, 27,...) Having such a shape, not only the strength of the hub part (23) of the turbo fan (5) is secured, but also the rotation of the turbo fan (5) In some cases, the rotation of the ribs (27, 27,...) Stirs the air flowing around the motor (25), thereby improving the cooling efficiency of the motor (25). Further, since the ribs (27, 27,...) Are provided radially between the openings (30, 30,...), The air flowing toward the openings (30, 30,...) Is guided. It also has a function as a guide plate.

  Further, as shown in FIGS. 3 and 6, the turbofan (5) has the lower end of the shroud (20) positioned above the lower end of the boss portion (24). Specifically, the lower end portion of the hub portion (23) and the boss portion (24) protrude downward from the lower end of the shroud (20). Therefore, the dimension from the upper end of the end plate (21) to the lower end of the shroud (20) is set to be smaller than the dimension from the upper end of the end plate (21) to the lower end of the boss part (24). Thus, the height of the turbo fan (5) can be minimized.

  As described above, in the present embodiment, a plurality of ribs (27, 27,...) Are projected from the upper surface of the hub portion (23), and the cooling efficiency of the motor (25) during operation is set high. For this reason, even if the distance between the top plate of the casing (3) and the end plate (21) is set small, the cooling performance of the motor (25) is maintained well. Therefore, it is possible to reduce the thickness of the entire air conditioner while avoiding the possibility of failure of the motor (25), and compare the protruding dimensions from the ceiling surface (A) when installed on the ceiling surface (A). Therefore, it is possible to obtain a good appearance. As a result, it is possible to improve the practicality of the air conditioner (1) that allows the conditioned air to be blown out from a plurality of directions with a ceiling suspension type.

  In addition, when the configuration of this embodiment is applied to a ceiling-embedded type, the entire apparatus can be thinned, so that there is no restriction on the ceiling space, and even in a narrow ceiling space. It becomes possible to install.

  In this embodiment, the openings (30, 30,...) And ribs (27, 27,...) Formed in the end plate (21) are alternately arranged at eight locations along the circumferential direction of the end plate (21). However, in the present invention, the formation position and the number of the formation positions can be arbitrarily set.

It is a perspective view of the ceiling suspension type air conditioning apparatus concerning an embodiment. It is a top view which shows the internal structure of an air conditioning apparatus. It is a longitudinal cross-sectional view of an air conditioning apparatus. It is a top view of a turbo fan. It is a bottom view of a turbo fan. It is sectional drawing along the ZZ line in FIG. It is sectional drawing which shows the installation state of the conventional turbofan.

Explanation of symbols

(1) Air conditioner
(5) Turbo fan
(20) Shroud
(21) End plate
(22) Blade
(24) Boss part (mounting part)
(25) Motor
(25a) Drive shaft
(27) Rib
(30) Opening
(A) Ceiling surface
(C) Air passage

Claims (4)

In a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between the front surfaces,
A central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. A drive shaft (25a) of the motor (25) is placed at the central portion of the bulged portion. While a cylindrical boss (24) for insertion is formed,
Around the boss part (24) of the end plate (21), the air that flows through the back side of the end plate (21) and cools the motor (25) is collected on the front side of the end plate (21). An opening (30,30,…) is formed,
On the back surface of the end plate (21), a plurality of ribs (27, 27, ...) extending radially around the boss portion (24) are projected in a state of being continuous with the boss portion (24) ,
Each of the plurality of ribs (27, 27,...) Protrudes from the end surface of the boss portion (24) at each inner peripheral end, and has a height from the outer peripheral surface of the boss portion (24). A turbofan characterized by being gradually lowered toward the outer peripheral side of the end plate (21) . In a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between the front surfaces,
A central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. A drive shaft (25a) of the motor (25) is placed at the central portion of the bulged portion. While a cylindrical boss (24) for insertion is formed,
Around the boss part (24) of the end plate (21), the air that flows through the back side of the end plate (21) and cools the motor (25) is collected on the front side of the end plate (21). An opening (30,30,…) is formed,
On the back surface of the end plate (21), a plurality of ribs (27, 27, ...) extending radially around the boss portion (24) are projected in a state of being continuous with the boss portion (24) ,
The protruding end surface of each rib (27, 27, ...) is located between the end surface of the motor (25) and the end surface of the boss portion (24) facing each other ,
The height of each rib (27, 27, ...) is gradually lowered from the outer peripheral surface of the boss portion (24) toward the outer peripheral side of the end plate (21). Turbo fan. In a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between the front surfaces,
A central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. A drive shaft (25a) of the motor (25) is placed at the central portion of the bulged portion. While a cylindrical boss (24) for insertion is formed,
Around the boss part (24) of the end plate (21), the air that flows through the back side of the end plate (21) and cools the motor (25) is collected on the front side of the end plate (21). An opening (30,30,…) is formed,
On the back surface of the end plate (21), a plurality of ribs (27, 27, ...) extending radially around the boss portion (24) are projected in a state of being continuous with the boss portion (24) ,
It said plurality of ribs (27, 27, ...), the end portions of the respective inner peripheral side protrudes from the end surface of the boss portion (24), end each height from the outer peripheral surface of the boss (24) It is characterized by being gradually lowered toward the outer peripheral side of the plate (21) and each overlapping with the opening (30, 30, ...) in the circumferential direction of the end plate (21). Turbo fan to do. In a turbofan comprising a blade (22) supported between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between the front surfaces,
A central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. A drive shaft (25a) of the motor (25) is placed at the central portion of the bulged portion. While a cylindrical boss (24) for insertion is formed,
Around the boss (24) in the end plate (21), a plurality of openings (30, 30, ...) are formed on the circumference concentric with the boss (24).
On the back surface of the end plate (21), a plurality of ribs (27, 27, ...) extending radially around the boss portion (24) are projected in a state of being continuous with the boss portion (24) ,
Each of the plurality of ribs (27, 27,...) Protrudes from the end surface of the boss portion (24) at each inner peripheral end, and has a height from the outer peripheral surface of the boss portion (24). A turbofan characterized by being gradually lowered toward the outer peripheral side of the end plate (21) .

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