JPH10153196A - Turbofan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin an entire air conditioner while maintaining the cooling performance of a motor. SOLUTION: In this turbofan, a rib 27 for stirring an air for cooling a motor 25 by flowing the back surface side of an end plate 21 is installed projectingly on the central part of the end plate 21 for a turbofan 5 internally equipped in an air conditioner 1 hung from a ceiling. The inside end of the rib 27 is set on the boss part 24 of the end plate 21. The outside end is set on a position facing to the center part of an air flow hole formed on the end plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbofan, and more particularly, to a measure for improving the cooling efficiency of a motor which is a driving source of the turbofan.

[0002]

2. Description of the Related Art Conventionally, an air conditioner installed on a ceiling has been known. As this type of air conditioner, for example, a ceiling embedded type which is embedded in an opening formed in a ceiling surface as disclosed in Japanese Patent Application Laid-Open No. 8-75240, or a ceiling directly installed on a ceiling surface There is a hanging type.

[0003] In general, the ceiling-mounted type is provided with a turbo fan inside the casing, and after adjusting the temperature of room air sucked from the lower surface of the casing by driving the fan with a heat exchanger, for example, in four directions of the casing. It blows out from inside toward the room.

[0004] The arrangement of a turbo fan in this type of air conditioner will be described with reference to FIG. As shown in this figure, the turbo fan (a) is supported by a motor (e) attached to a top plate (g) of the device casing, and an end plate (b), a shroud (c), and an end plate (b)
And a plurality of blades (d) held between the lower surface of the shroud (c) and the upper surface of the shroud (c). end plate
(b) is made of a circular plate material, the central part of which bulges downward,
An accommodation space for the motor (e) is formed above the bulging portion. A plurality of openings (h, h) are formed through the center of the end plate (b). The shroud (c) is made of a circular plate having an air introduction opening (c1) in the center, and is curved downward toward the inner peripheral side. With such a configuration, an air passage (f) is formed between the end plate (b) and the shroud (c) inside the turbo fan (a).

During operation of the air conditioner, a turbo fan
Part of the air blown out from the outlet of (a) is the end plate
(b) to cool the motor (e)
Arrow D). Then this air is
(b) It passes through the opening (h) in the center part and is collected in the air passage (f). Thus, the motor (e) is cooled.

On the other hand, the ceiling-suspended type is provided with a sirocco fan inside the casing, and the temperature of room air sucked into the casing by driving the fan is adjusted by a heat exchanger in the same manner as described above. From the front of the room. In other words, the ceiling hanging type generally blows out conditioned air from only one direction on the front surface of the casing.

[0007]

SUMMARY OF THE INVENTION The inventor of the present invention has studied the possibility of blowing out conditioned air from a plurality of directions even in an air conditioner of a suspended ceiling type. In this case, it is conceivable to adopt a configuration similar to that of the above-mentioned ceiling-embedded type.

However, in the case of a ceiling-suspended type, the height of the device is the same as the projected size from the ceiling surface.
If the height of the device is large, the device protrudes greatly downward from the ceiling surface, and the appearance is poor. In the case of the ceiling-mounted type, most of the equipment is located in the space behind the ceiling and the projected size to the indoor side is originally small, so the height of the equipment is designed almost without consideration. is there. Therefore, it is not practical to apply the conventional ceiling-mounted type as it is to the ceiling hanging type in terms of appearance. For this reason, although it is possible to blow out conditioned air from a plurality of directions using a ceiling-hanging type, it is necessary to reduce the thickness of the entire apparatus in order to put it to practical use.

As 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 small, that is, a turbo fan is used.
It is conceivable to arrange (a) close to the casing top plate (g).

However, when such a means is adopted, the area of the air passage for cooling the motor (e) is reduced, and the cooling performance is hindered.
The possibility of failure occurrence in (e) increases.

[0011] In addition to the ceiling-suspended type, even if it is a ceiling-mounted type, thinning does not limit the space above the ceiling (the space can be installed even in a narrow space above the ceiling). Is effective.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to improve the shape of a turbofan so that the overall device can be made thinner while maintaining the cooling performance of a motor. And

[0013]

In order to achieve the above object, the present invention improves the cooling efficiency of a motor by providing a rib on an end plate for stirring air around the motor as the turbo fan rotates. Thus, it is possible to set a small distance between the casing top plate and the end plate.

According to the first aspect of the present invention, as shown in FIG. 6, between an end plate (21) and a shroud (20) arranged so as to form an air passage (C) between the front surfaces. It is assumed that the turbo fan supports the blade (22). The central portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof, and the central portion of the bulge portion is attached to the drive shaft (25a) of the motor (25). The mounting part (24). The motor (2) flows around the mounting portion (24) on the rear side of the end plate (21).
Openings (30, 30,...) Are formed on the front side of the end plate (21) to collect the air cooled in 5). Further, ribs (27, 27, 27) that stir the air around the motor (25) with the rotation of the end plate (21) are provided on the back of the bulging portion of the end plate (21).
…).

According to this specific matter, the air around the motor (25) is stirred by the ribs (27, 27,...) With the rotation of the turbo fan. For this reason, the cooling efficiency of the motor (25) increases, and when the turbo fan is installed in a ceiling-mounted air conditioner, the distance between the top plate and the end plate (21) of the device casing is set to be small. Even if it does, the cooling performance of the motor will be maintained satisfactorily.

The invention according to claim 2 is characterized in that the openings (30, 30,
..) And ribs (27, 27,...). That is, the openings (30, 30, ...) are connected to the end plate (21).
Are formed at a plurality of locations on a concentric circle with respect to the center. Also,
The ribs (27, 27, ...) are located between the openings (30, 30) adjacent to each other in the circumferential direction of the end plate, and the end plate (21)
Is formed radially with respect to the center of. Furthermore, ribs (27,27,
…) The inner end of the mounting part (24) and the outer end adjacent to the opening
(30) is configured to be set at a position facing a substantially central portion in the radial direction of the end plate.

According to this specific matter, the configuration of the ribs (27, 27,...) Capable of reliably improving the cooling efficiency of the motor (25) is obtained. Since the ribs (27, 27, ...) are provided radially between the openings (30, 30, ...), the openings (30, 3
It also has a function as a guide plate for guiding the air flowing toward (0, ...).

According to a third aspect of the present invention, the turbo fan according to the first aspect is provided in a ceiling-mounted air conditioner (1).

According to this specific matter, the distance between the top plate of the device casing and the end plate (21) can be set small while maintaining the cooling performance of the motor (25), and the device can be made thin.

[0020]

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 an internal structure of the air conditioner (1), and FIG. 3 is a longitudinal sectional view thereof.

As shown in these figures, the present air conditioner
(1) is provided with a box-shaped casing (3) installed on the ceiling surface (A) and having air outlets (2A, 2B, 2C, 2D) opened horizontally on four sides. Inside this casing (3)
A ring-shaped heat exchanger (4) facing each air outlet (2A, 2B, 2C, 2D) and a resin turbofan (5) located in the center of the casing are housed. . At each of the air outlets (2A, 2B, 2C, 2D), horizontal blades (6) for adjusting the direction of the conditioned air into the room are provided rotatably about a horizontal axis.

On the lower surface of the casing (3), a suction grill (8) having an air suction port (7) in the center is attached to be openable and closable. (9) in FIG. 3 is an air filter for removing dust and the like in the intake air.

The heat exchanger (4) is of a cross-fin type in which a number of plate-like fins are attached to a plurality of heat transfer tubes arranged in parallel to each other in an orthogonal state. During heating operation, it functions as a condenser. This regulates the temperature of the air derived from the turbo fan (5).

The heat exchanger (4) is provided below the heat exchanger.
Drain pan (1) for collecting drain water generated in (4)
0) is provided.

At one corner (the lower right corner in FIG. 2) of the casing (3), a piping space (12A) divided by a partition plate (11) with respect to the casing internal space.
Are formed. In this piping space (12A), a hanging pipe (15A) for hanging the refrigerant pipe (13), the drain pump (14), and the casing (3) to a concrete member in the space above the ceiling with a hanging bolt are provided. Are located. This piping space (12A) is covered by a corner cover (16A) that is detachable from the casing (3). Also,
At the other three corners, spaces (12B, 12C, 12D) are formed with respect to the inner space of the casing by a heat insulating material (17). Hanging fittings (15B, 15C, 15D) are arranged in each of these spaces (12B, 12C, 12D), and each is covered with a corner cover (16B, 16C, 16D). These corner covers (16A to 16D) ensure the good appearance of the air conditioner (1).

Hereinafter, the turbo fan (5) will be described. FIG. 4 is a plan view of the turbofan (5), FIG. 5 is a bottom view of the turbofan, and FIG. 6 is a sectional view taken along the line ZZ in FIG. This turbo fan (5) has a circular end plate (21) and an air introduction opening (20
a) a circular shroud (20) with
1) and a blade (22) held between them. The blade (22) is made of a wing-shaped plate material that is inclined in a counterclockwise direction toward the outer peripheral side in FIG. The center of the end plate (21) swells downward and the hub (23)
Is configured. Due to this bulging, a housing space for the motor (25) is formed above the hub (23). At the center of the hub part (23), a cylindrical boss part as an attachment part according to the present invention
(24) is integrally formed. The boss (24) is directly connected to the lower end of the drive shaft (25a) of the motor (25) disposed at the center of the casing (3). Specifically, this boss (24)
Inside the cylindrical boss body (24a), a metallic first ring
(24b), an anti-vibration rubber (24c), and a second metal ring (24d) are integrally fitted. A drive shaft (25a) of a motor (25) is fitted in the center of the second ring (24d). Opening for fitting
(24e) is formed. Motor (25) is inserted into this opening (24e).
The drive shaft (25a) is fitted into the drive shaft (25a), and the nut (N) is screwed from below, whereby the turbo fan (5) is rotatably attached to the drive shaft (25a) (see FIG. 3). This allows
As the motor (25) is driven, the entire turbo fan (5) rotates (rotates clockwise in FIG. 4), and the turbo fan (5) rotates.
(5) Air sucked from below is blown out radially outward.

On the lower side of the turbo fan (5),
A bell mouth (26) for guiding room air to the turbo fan (5) is provided. The bell mouth (26) has an opening (26a) at the center thereof which is slightly smaller than the opening (20a) of the shroud (20). The edge of the opening (26a) is formed in an arc-shaped cross section so that air can flow smoothly to the turbo fan (5).

The hub (23) has an opening (3) formed by a long hole.
0, 30,...) Are formed at eight locations on a concentric circle centered on the boss portion (24). This opening (30,30,…) is a part of the air blown from the outer periphery of the turbo fan (5).
When the heat enters the periphery of the motor (25) by wrapping around the back side of the (21) and takes heat from the motor (25), this air is again transferred to the hub (2).
3) for discharging to the lower side (arrow B in FIG. 3)
reference). In other words, the motor (25)
Is cooled.

As a feature of this embodiment, the hub (2
A plurality of resin ribs (27, 27,...) Protrude from the upper surface of 3). These ribs (27, 27, ...) are arranged radially around the boss (24). Specifically, the opening (30,
30,...) Are formed at eight places between the two, and the inner end is located on the upper surface of the boss portion (24), and the outer end is located opposite the substantially central portion in the longitudinal direction of the opening (30). ing. By providing the ribs (27, 27,...) Having such a shape, not only the strength of the hub portion (23) of the turbofan (5) is ensured but also the rotation of the turbofan (5). Sometimes this rib
The air flowing around the motor (25) is stirred by the rotation of (27, 27,...), So that the cooling efficiency of the motor (25) can be improved. Furthermore, this rib (27,27,
…) Are provided radially between the openings (30, 30,…), and also have a function as a guide plate for guiding the air flowing toward the openings (30, 30,…). I have.

The turbo fan (5) is shown in FIGS.
As shown in (2), the lower end of the shroud (20) is located above the lower end of the boss (24). Specifically, the shroud
(20), the lower end of the hub (23) and the boss (24)
Has a shape protruding downward. Therefore, the dimension from the upper end of the end plate (21) to the lower end of the shroud (20) is set to be equal to or less than the dimension from the upper end of the end plate (21) to the lower end of the boss (24). Thus, the height of the turbo fan (5) can be kept to a minimum.

As described above, in the present embodiment, the hub portion
A plurality of ribs (27, 27,...) Protrude from the upper surface of (23) to set a high cooling efficiency of the motor (25) during operation. Therefore, 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) can be maintained satisfactorily. Therefore, it is possible to reduce the thickness of the air conditioner as a whole while avoiding the possibility of failure of the motor (25), and compare the size of the protrusion from the ceiling surface (A) when installed on the ceiling surface (A). It is possible to achieve a good appearance by reducing the size. As a result, it is possible to improve the practicality of the air conditioner (1), which is a ceiling-suspended type capable of blowing out conditioned air from a plurality of directions.

Further, even when the configuration of the present embodiment is applied to an embedded ceiling type, the entire apparatus can be made thinner, so that there is no restriction on the space above the ceiling and the space above the ceiling can be reduced. It will be possible to install it.

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

[0035]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, ribs (27, 27,...) For stirring the air around the motor (25) are provided on the rear surface of the end plate (21) with respect to the turbo fan, so that the motor (25) is The cooling efficiency was increased. For this reason, when the turbo fan is installed in a ceiling-mounted air conditioner, the cooling performance of the motor (25) is reduced even if the distance between the top plate and the end plate (21) of the device casing is set small. Will be maintained well,
It is possible to achieve both reduction in the thickness of the device and securing of the cooling performance of the motor (25).

According to a second aspect of the present invention, the end plate (2
Openings (30, 30, ...) and ribs (27, 27, ...) formed in 1)
By embodying the configuration of the above, the practicality of the turbofan that exhibits the effect according to the first aspect of the present invention can be improved. The ribs (27, 27,…) have openings (30, 30,
…) This opening is provided radially between
(30,30,…) will also have a function as a guide plate to guide the air flowing toward (30,30,…)
..) Can be smoothly collected from the front side of the end plate (21), thereby also improving the cooling performance of the motor (25).

According to a third aspect of the present invention, the turbofan according to the first aspect is provided in a ceiling-mounted air conditioner (1). As a result, while maintaining the cooling performance of the motor (25), the distance between the top plate of the device casing and the end plate (21) can be set small, and the device can be made thinner. When applied to the air conditioner of (1), the size of the projection from the ceiling surface can be reduced, so that the appearance of the installation state can be obtained well.

[Brief description of the drawings]

FIG. 1 is a perspective view of a ceiling-suspended air conditioner according to an embodiment.

FIG. 2 is a plan view showing the internal structure of the air conditioner.

FIG. 3 is a longitudinal sectional view of the air conditioner.

FIG. 4 is a plan view of a turbo fan.

FIG. 5 is a bottom view of the turbo fan.

FIG. 6 is a sectional view taken along the line ZZ in FIG.

FIG. 7 is a cross-sectional view showing an installation state of a conventional turbo fan.

[Explanation of symbols]

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

Claims (3)

[Claims] An end plate (21) and a shroud (20) arranged to form an air passage (C) between the front surfaces.
In the turbo fan that supports the blade (22) between the end plate (21), the center portion of the end plate (21) bulges toward the shroud (20), and a motor housing space is formed on the back side thereof. The central part of this part is a mounting part (24) that is mounted on the drive shaft (25a) of the motor (25), while around this mounting part (24), there is a flow on the back side of the end plate (21). An opening (30, 30,...) For collecting the air cooled by the motor (25) at the front side of the end plate (21) is formed. A turbo fan characterized by having ribs (27, 27,...) For agitating air around the motor (25) as the end plate (21) rotates. 2. The turbofan according to claim 1, wherein the openings (30, 30,...) For collecting air cooled by the motor (25).
Are formed at a plurality of concentric circles with respect to the center of the end plate (21), and the ribs (27, 27, ...) are formed between the openings (30, 30) adjacent in the circumferential direction of the end plate. Position the end plate (21)
The inner ends of the ribs (27, 27,...) Are attached to the mounting portion (24), and the outer ends of the ribs (27, 27,. A turbo fan, wherein the turbo fan is set at a position facing the turbo fan. 3. The turbo fan according to claim 1, wherein the turbo fan is installed in a ceiling-mounted air conditioner (1) installed on a ceiling surface (A) in a room.