JPH06137608A - Outdoor unit for air conditioning apparatus - Google Patents

Abstract

PURPOSE:To reduce noises and blast resistance by improving a construction of a bell mouth and a supply grille. CONSTITUTION:A bellmouth 21 arranged to surround a fan 7 in a casing comprises a ring portion 22 which is substantially semi-circular or quarter- circular in cross section and to which an outlet of the casing is opened, a cylindrical portion 23 provided integrally and continuously from inside of the ring portion 22 to the opening side thereof, and a support plate 25 having a curved portion 24 which is joined to the cylindrical portion 23 and diverges gradually. A spacing, depth or width of lattice-shaped frames of a supply grille 15 provided on the outlet of the casing is set to be greater on an outer peripheral side than a central portion of the fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit for an air conditioner, and more particularly to an outdoor unit for an air conditioner designed to reduce blast noise and blast resistance.

[0002]

13 and 14 show the cross-sectional structure of a general outdoor unit for an air conditioner. In the outdoor unit shown in these figures, the space inside the case 1 is divided into a heat exchange chamber 3 and a compressor chamber 4 by a partition wall 2. In the heat exchange chamber 3, the outdoor heat exchanger 5, the fan motor, and the like. 6 and a fan 7 are provided, and a compressor 8 is provided in the compressor chamber 4.

A bell mouth 9 is provided in the case 1 so as to surround the fan 7. This bell mouth 9
As shown in FIG. 15, a ring portion 11 having a substantially semicircular cross section, which is open on the case outlet 10 side, and the ring portion 11
A cylindrical portion 12 continuously extending from the inner diameter side edge of the fan 7 in parallel with the axial center of the fan 7, and a support plate 14 along the front face continuously connected to the cylindrical portion 12 via a curved portion 13. ing.

16 and 17 show the structure of the blow-out grill 15 on the front surface of the case 1. As shown in FIG. The blowout grill 15 includes a large number of vertical and horizontal bars 17, 1 supported by a frame body 16.
8 form a grid pattern.

During operation, the air that has been heat-exchanged by the outdoor heat exchanger 5 is transferred to the bell mouth 9 by the fan 7.
And flows out through the gap between the crosspieces 17 and 18 of the blowout grill 15 to the outside.

[0006]

By the way, in the above-described outdoor unit for an air conditioner, the blowing noise and the blowing resistance are increased due to the structure of the bell mouth 9 and the crosspieces 17 and 18 of the blowout grill 15. There was a problem.

That is, the bell mouth 9 shown in FIG.
Since the structure has the cylindrical portion 12 extending along the direction parallel to the axis of the fan 7, the air passing through the gap between the fan 7 and the bell mouth 9 is along the direction parallel to the axis of the fan 7. And is guided to the outlet grill 15.

Therefore, in reality, the air to be discharged in the outer peripheral direction of the fan 7 due to the centrifugal force when the fan 7 rotates comes into contact with the cylindrical portion 12 of the bell mouth 9.
The airflow resistance was so high.

Further, since a large amount of discharge air forcedly regulated in the direction parallel to the axial center of the fan 7 passes through the crosspieces 17 and 18 of the blowout grill 15, the crosspieces 17 and 18,
Blast noise at 18 was also loud.

Moreover, in the conventional blow-out grill 15, since a large number of vertical and horizontal grid-shaped crosspieces 17 and 18 are arranged at equal intervals in the vertical and horizontal directions, in reality, the number is small at the center of the fan 7 and the outer circumference is small. For a large air flow on the side,
The distance between the crosspieces 17 and 18 on the outer peripheral side is relatively small, and thus the air blowing noise and the air blowing resistance are large on the outer peripheral side.

Further, according to the structure of the conventional blow-out grill 15, as shown in FIG. 17, the width b in the depth direction of the crosspieces 17 and 18 is set to a substantially constant value from the fan center position to the outer peripheral side. There is. Even in such a structure, the resistance on the outer peripheral side of the fan 7 having a large blowing amount becomes larger than the resistance on the central side of the fan 7, and the air discharged from the gap on the outer peripheral side causes the blowing noise and the blowing resistance. It was getting bigger.

The present invention has been made in view of the above circumstances, and provides an outdoor unit for an air conditioner in which the ventilation noise and the ventilation resistance can be reduced by improving the structure of the bell mouth and the structure of the blowing grill. The purpose is to do.

[0013]

In order to achieve the above object, the invention of claim 1 is an outdoor unit for an air conditioner in which a bell mouth is arranged in a case so as to surround a fan. Is a ring part having a substantially semi-circular cross-section that opens to the case outlet side, a cylindrical part that is integrally connected from the inside of the ring part toward the opening side, and gradually expands by being joined to this cylindrical part. And a support plate having a curved portion that changes.

According to a second aspect of the present invention, in an outdoor unit for an air conditioner in which a bell mouth is arranged in a case so as to surround a fan, the bell mouth has a ring having a substantially quadrangular cross section which is open at a case outlet side. A ring portion, a cylindrical portion integrally provided continuously from the inside of the ring portion toward the opening side, and a support plate having a curved portion which is joined to the cylindrical portion and gradually expands. .

According to a third aspect of the present invention, in the air conditioner outdoor unit in which a bell mouth is arranged in a case so as to surround the fan, and a blow outlet is formed facing the bell mouth, the case blow outlet is provided. It is characterized in that the intervals between the lattice-like bars of the blowout grill provided are set to be larger on the outer peripheral side than the center position of the fan.

According to a fourth aspect of the invention, in the outdoor unit for an air conditioner, the bell mouth is arranged in a case so as to surround the fan, and the air outlet is formed facing the bell mouth. The width of the lattice-shaped bars of the blowout grill provided in the depth direction is set to be smaller on the outer peripheral side than the center position of the fan.

[0017]

According to the invention of claim 1, since the inner surface of the bell mouth is arranged along the air flow in the centrifugal direction by the fan, the air passing through the gap between the fan and the bell mouth is
When passing through the curved part from the ring part of the bell mouth through the cylindrical part, it spreads in the radial direction, reducing the air flow resistance in the bell mouth and the air volume passing through the blowout grill also on the fan shaft center side and the outer circumference. It is even on the side and the blast noise is reduced.

Also in the invention of claim 2, a cylindrical portion is continuously provided on the outer peripheral side of the ring portion of the bell mouth having a substantially semicircular cross section, and the cylindrical portion is joined to the support plate through the curved portion. Therefore, as in the case of the first aspect of the invention, the air naturally spreads along the centrifugal direction of the fan, and the blowing noise and the blowing resistance can be reduced.

According to the third aspect of the present invention, since the interval between the bars of the blowout grill is set to be larger on the outer peripheral side than the fan center position, the air blowing resistance on the outer peripheral side where the air volume is large is reduced. This also reduces blast noise.

According to the fourth aspect of the present invention, the width in the depth direction of the bar of the outlet grill is set to be smaller on the outer peripheral side than the center position of the fan. At the same time, the blast noise is reduced.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same members as those described in the conventional example will be described using the same reference numerals, and description of the same components will be omitted.

Embodiment 1 (FIGS. 1 to 3) This embodiment relates to an improvement of the bell mouth.

FIG. 1 is an enlarged view of the structure of the bell mouth. As shown in FIG. 1, in this embodiment, a bell mouth 21 that coaxially surrounds the fan 7 includes a ring portion 22 having a substantially semicircular cross section that opens on the case outlet side and an opening side from the inside of the ring portion 22. The cylindrical portion 23 that is integrally connected toward the
And the curved portion 24 that is joined to this cylindrical portion and gradually expands.
And a support plate 25 having

The ring portion 22 and the cylindrical portion 23 are integrally formed by molding. The ring portion 23 and the curved portion 24 are integrally joined by the engagement of the protrusion 26 and the hole 27. Curved portion 2 of support plate 25
A partition wall 2 that divides the heat exchange chamber 3 and the compressor chamber 4 is continuously provided on the outer peripheral side of 4.

According to this structure, the bell mouth 21
Since the inner surface of the fan 7 is arranged along the air flow in the centrifugal direction by the fan 7, the air c passing through the gap between the fan 7 and the bell mouth 21 is curved from the ring portion 22 of the bell mouth 21 through the cylindrical portion 23. When passing through the portion 24, the air is diffused in the radial direction, and the ventilation resistance of the bell mouth 21 is reduced. Further, as shown in FIG. 2 (A), since the air volume passing through the blowout grill 15 is uniform on the fan shaft center side and the outer circumference side, even if a fan guard or the like is arranged at the blowout port, Blower noise is also reduced compared to the case of the conventional structure shown in (B) (see Vmax of the air volume distribution shown in FIGS. 7A and 7B).

Here, the inner radius of the ring portion 22 with respect to the fan center is R1, the radius of the ring portion 22 to the curved surface center position is R2, the radius of the cylindrical portion 23 is R3, and the curved portion 2 is
The outer radius of 4 is R4, and the outer radius of the ring portion 22 is R5. The radius of curvature of the ring portion 22 is RR1 and the radius of curvature of the curved portion 24 is RR2.

In this case, in this embodiment, R5 ≧ R3 ≧ R
It is set to 1.

Further, R3≤R5-RR2 is set.

According to such a setting, the structure of the partition wall 2 can be brought up to R5, so that it is not necessary to bend the partition wall 2 at the front and rear portions 2a and 2b as in the conventional structure shown in FIG. It can be a straight plate as shown in FIG.
This leads to expansion of the compressor chamber 4 compared to the conventional case under the case 1 of the same size, and further reduction of the size of the case 1 if the compressor chamber 4 has the same volume as the conventional case. . Therefore, according to the present embodiment, there is an advantage that the case 1 can be made compact. In this case, it is more effective that R3 and R5 are substantially equal. In this embodiment, RR
It is set to 1> 10 mm, RR2> 10 mm, R4> R1.

Regarding the dimensional relationship in the axial direction of the fan, the ring portion 2 is based on the center of curvature of the ring portion 22.
2, the outer peripheral side length is H1, the inner peripheral side length is H2, and the cylindrical portion 2
3, the length of the curved portion of the curved portion 24 with reference to the support plate 25 is HB1, the length up to the same end portion is HB2, and the length up to the curved center portion of the ring portion 22 is H3. HB3
In this case, the relations H2 ≧ H1, H3> H2, and HB3> H2 are set.

FIG. 3 shows the curved portion 24 of the bell mouth 21.
In the modified example, the curved portion 24 is tapered so that the diameter thereof gradually increases toward the outlet side.

According to such a structure, the air flow a is more likely to flow in the centrifugal direction of the fan 7. In particular, in this example, as shown in FIG. 3, the taper angle of the curved portion 24 is set so as to match the tip of the inner peripheral side of the ring portion 22, so that the ventilation resistance is extremely effectively suppressed. .

Embodiment 2 (FIGS. 4 to 6) FIG. 4 shows the basic construction of this embodiment. That is, in this embodiment, the bell mouth 21 includes a ring portion 22 having a substantially quadrilateral circular cross section, which is open on the case outlet side, and the ring portion 2.
Cylindrical part 2 integrally connected from the inside of 2 toward the opening side
3 and a supporting plate 25 having a curved portion 24 that is joined to the cylindrical portion 23 and gradually expands.

Even with this structure, the air flow passing through the gap between the fan 7 and the bell mouth 21 is similar to that in the first embodiment, from the ring portion 22 having a substantially semicircular cross section to the cylindrical portion 23.
Since the air circulates so as to diffuse toward, the air naturally flows along the centrifugal direction of the fan, so that the ventilation noise and the ventilation resistance can be reduced.

Also, in the embodiment of FIG. 4, the partition plate 2 is arranged to be joined to the cylindrical portion 23, and the joining end portion of the partition plate 2 with respect to the support plate 25 should avoid the curved portion 24. It has a bent shape. In this way, the partition plate 2
In the arrangement configuration in which the cylindrical portion 23 and the cylindrical portion 23 are joined, the partition plate 25 can be arranged further on the fan 7 side than in the first embodiment. Therefore, it is possible to further expand the compressor chamber 4 and further downsize the case 1.

FIG. 5 shows a configuration in which the outer peripheral side of the ring portion 22 is extended to the side opposite to the fan side with respect to the bell mouth 21 of FIG. In this example, the partition plate 25 is arranged on the side opposite to the fan by the extension of the ring portion 22 to the outer peripheral side, but the guide area of the air flow is increased.

FIG. 6 shows the structure of the bell mouth 21 in which the cylindrical portion 23 is stepped and the position of the bending portion 24 is shifted to the side opposite to the fan. According to the bell mouth 21 of the present example, the shift of the bending portion 24 expands the diffusion flow range of the second stage, which is a wake from the ring portion 22, and has an advantage that the reduction of the air flow resistance can be further expanded.

Embodiment 3 (FIGS. 7 to 11) In this embodiment, the structure of the outlet grill provided at the outlet of the case is improved.

Basically, the grid-like bars 1 of the outlet grill 15
The interval between 7 and 18 is set larger on the outer peripheral side than the fan center position.

FIG. 7 shows the first example.
Is set larger on both outer sides than the fan center position. FIG. 8 shows a second example in which the distance between the horizontal rails 18 is set to be larger on the upper and lower end sides than the fan center position. 9 and 10 show a third example, in which the distance between the vertical and horizontal rails 17 and 18 is set larger on the outer peripheral side than the fan center position.

According to the structure of this embodiment, since the distance between the crosspieces 17 and 18 of the blowout grill 15 is set larger on the outer peripheral side than the fan center position, the blowing resistance on the outer peripheral side where the air volume is large. Is reduced, the blowing characteristics of the propeller fan are effectively used, and the blowing noise is also reduced.

In particular, in the third example shown in FIGS. 9 and 10, the opening area is greatly expanded on the outer peripheral side (whole four corners) of the blowout grill 15 as compared with the fan shaft center side (central part).
The reduction of ventilation resistance is large, the flow of wind is smooth, and noise is greatly suppressed.

The diameter D1 of the fan 7 and the bell mouth 2
The relationship between the inner diameter D2 of 1 and the diameter D3 of the outlet grill 15 is preferably D2> D1, D3 ≧ D2 × 1.1,
Especially, the larger D3 is, the greater the effect is.

This is because the attachment portion of the blowout grill 15 is farther from the bell mouth 21 and the curved portion 24 thereof, so that the velocity of the airflow blown out along the curved portion 24 is reduced by friction, and the blowout grille. This is because the noise when the vehicle collides with 15 can be reduced.

As another example, FIG. 11 shows a structure in which the ventilation openings of the blowout grill 15 are enlarged to both sides so that the wind blows out from those portions as well. According to such a configuration, in addition to the above-described effects, advantages such as a more uniform blown air volume can be obtained. Embodiment 4 (FIG. 12) In this embodiment, the width b in the depth direction of the lattice-shaped bars 17, 18 of the blowout grill 15 provided in the case outlet 10 is set to be smaller on the outer peripheral side than the central position of the fan 7. It is a thing.

According to this structure, the outlet grill 15
Since the width b of the crosspieces 17 and 18 in the depth direction is set to be smaller on the outer peripheral side than the center position of the fan, the air flow resistance on the outer peripheral side where the air volume is large is reduced and turbulent flow is prevented at the same time. Therefore, ventilation noise is also reduced.

The deformed portion for setting the width change of the crosspieces 17 and 18 is preferably inside the blowout grill 15 (on the fan side). The portion where the width of the crosspieces 17 and 18 is thinned is shown in FIG.
As shown in 2, even if the strength of the crosspieces 17 and 18 is slightly reduced, it is desirable to consider the contact with the fan and the like so that the portion that is on the radially outer side of the fan outlet 10 is located. Further, as the type of shape of the outlet grill 15 to which the present embodiment is applied, those having only the horizontal rails 18, those having only the vertical rails 17, and the both rails 17,
Of course, various things such as those having 18 are possible. Further, the front shape of the blowout grill 15 can be square or other various shapes.

By reducing the width of the crosspieces 17 and 18, it is possible to increase the distance between the crosspieces 17 and 18 and the support plate 25 of the bell mouth 21. Therefore, there is an advantage in that more ventilation is provided inside and on the outer peripheral side of the grill, the wind speed is reduced at the central side, and noise can be further reduced.

[0049]

As described above, according to the present invention, by improving the structure of the bell mouth and the structure of the blowing grill, excellent effects such as reduction of blast noise and blast resistance can be achieved.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part showing a first embodiment of the present invention.

FIG. 2A is an explanatory view of the operation of the same embodiment, and FIG. 2B is an explanatory view of the operation of a corresponding conventional example.

FIG. 3 is a view showing a modified example of the same embodiment.

FIG. 4 is an enlarged view of a main part showing a second embodiment of the present invention.

FIG. 5 is a view showing a modified example of the same embodiment.

FIG. 6 is a view showing another modified example of the same embodiment.

FIG. 7 is a front view of a main part showing a third embodiment of the present invention.

FIG. 8 is a view showing a modified example of the same embodiment.

FIG. 9 is a view showing another modified example of the same embodiment.

10 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 11 is a view showing a modified example of the same embodiment.

FIG. 12 is a cross-sectional view of the essential parts showing Embodiment 4 of the present invention.

FIG. 13 is a schematic cross-sectional view showing a conventional configuration of an outdoor unit.

14 is a front view of the outdoor unit shown in FIG.

FIG. 15 is a diagram showing a conventional example corresponding to the first and second embodiments.

FIG. 16 is a diagram showing a conventional example corresponding to the third embodiment.

FIG. 17 is a diagram showing a conventional example corresponding to the fourth embodiment.

[Explanation of symbols]

 1 Case 7 Fan 10 Case Outlet 15 Outlet Grill 17,18 Crosspiece 21 Bellmouth 22 Ring Part 23 Cylindrical Part 24 Curved Part 25 Support Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiko Sato, 336 Tatehara, Fuji City, Shizuoka Prefecture, Toshiba Corporation Fuji factory (72) Inventor Tomoyoshi Takeuchi, 336, Tatehara, Fuji City, Shizuoka Prefecture, Toshiba Corporation, Fuji Factory, Ltd.

Claims (4)

[Claims] 1. In an outdoor unit for an air conditioner in which a bell mouth is arranged so as to surround a fan in a case, the bell mouth has a ring portion having a substantially semicircular cross section which is open at a case outlet side, and the ring. For an air conditioner, comprising: a cylindrical portion integrally connected from the inside of the portion toward the opening side thereof; and a support plate having a curved portion that is joined to the cylindrical portion and gradually expands. Outdoor unit. 2. In an outdoor unit for an air conditioner, in which a bell mouth is arranged in a case so as to surround a fan, the bell mouth has a ring portion having a substantially quadrangular cross section opened at a case outlet side, and the ring. An outdoor unit for an air conditioner, comprising: a cylindrical portion integrally connected from the inside of the portion toward the opening side; and a support plate having a curved portion that is joined to the cylindrical portion and gradually expands. unit. 3. An outdoor unit for an air conditioner in which a bell mouth is arranged so as to surround a fan in a case, and a blow outlet is formed facing the bell mouth, in an air conditioner outdoor unit. An outdoor unit for an air conditioner, characterized in that the intervals between the lattice-shaped bars are set to be larger on the outer peripheral side than the center position of the fan. 4. An outdoor unit for an air conditioner in which a bell mouth is arranged in a case so as to surround a fan, and an outlet is formed facing the bell mouth, in an air outlet grill provided at the case outlet. The outdoor unit for an air conditioner, wherein the width of the lattice-shaped bars in the depth direction is set to be smaller on the outer peripheral side than the fan center position.