JP3263452B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separate type air conditioner having an outdoor unit, for example.

[0002]

2. Description of the Related Art As is well known, in an outdoor unit installed outside a separate type air conditioner, an outdoor heat exchanger and a blower for promoting heat exchange are housed in a housing together with a compressor and the like. The blower is arranged such that the blow side faces a blow grill provided on the outer surface of the housing, and the suction side faces the outdoor heat exchanger.

FIGS. 17 to 2 show a conventional technique.
0 will be described. 17 is a cross-sectional view of a main part of the outdoor unit, FIG. 18 is a front view of a main part of the outdoor unit, FIG. 19 is a partially enlarged cross-sectional view of the blowout grill,
FIG. 20 is a cross-sectional view showing an example of the horizontal rail of the blowout grill.

[0004] In FIGS. 17 to 19, a blower 5 in which a propeller-shaped blade 3 is driven by a motor 4 is housed in a housing 2 of the outdoor unit 1, and a blowout side of the blower 5 is opposed to the blower 5. Bellmouth 6 on the wall of 2
Is formed. The housing 2 houses an outdoor heat exchanger (not shown) so as to surround the suction side of the blower 5.

[0005] A blowout grill 8 is provided on the front surface of the blowout opening 7 of the housing 2 so as to close the outlet 7 directly on the wall surface of the housing 2. This outlet grill 8
Is a frame 9 provided along the opening edge of the outlet 7 at the time of mounting, a horizontal bar 10 which is a main bar fixed at both left and right ends to the frame 9, and an adjacent horizontal bar 10. It is integrally formed so as to have reinforcing bars 11 provided at predetermined intervals in the left-right direction so as to be connected.

The cross-section of the horizontal rail 10 of the blow-off grill 8 has an oval cross-section at the windward end and the leeward end, and has an oval shape having the same radius in the blowing direction. The opening of the outlet grill 8 is formed to have substantially the same size as the facing outlet 7, and the air sent from the blower 5 and passing through the bell mouth 6 is immediately discharged from the outlet 7 to the outlet grill 8 having substantially the same size. The air is blown out to the outside through the opening portion. The direction in which air flows is indicated by arrow Z.

[0007] However, in such a configuration, the blowout grill 8 immediately behind the blades 3 generates a noise with respect to the flow of the air sent from the blower 5, thereby causing noise.

[0008] For this reason, the cause of the noise was analyzed to reduce the noise.
In the horizontal rail 10 located at a position parallel to the horizontal axis, the air blown from the wing trailing edge 13 at this position passes the horizontal rail 10 at the same time, and when passing, generates noise having a peak at a specific frequency. And so on.

Further, the flow of the air sent from the blower 5 is not uniform due to the influence of the wind speed distribution around the blade 3, but has an outflow angle fluctuating within a range of about ± 30 degrees. Is sent out to the outlet grill 8. When air is blown to the outside through the opening of the blowout grill 8, the crosspiece 10 immediately behind the blade 3 becomes a resistance, and the fluctuation of the outflow angle makes the crosspiece 10 oblique to the flow. The horizontal rail 10 generates a noise due to a large resistance.

Further, since the blow-out grill 8 is formed by integral molding, a mold-matching portion is inevitably formed on the cross section of the cross rail 10 in the direction in which the air flows.
Even when each mold to be matched is formed with high precision, when the mold is attached to the molding apparatus and the molding is performed, as shown in FIG.
And the step 12 was seen from the downstream side, and the appearance was poor.

[0011]

Conventionally, as described above, a blowout grill provided immediately behind a blade on the outer surface of a housing, which is a blowout side of a blower, causes noise from the outdoor unit due to resistance to the flow. Has occurred. SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the noise generated by a blower and a blowout grill provided opposite to the blower so that the outdoor unit has low noise. An object of the present invention is to provide a simplified air conditioner.

[0012]

An air conditioner according to the present invention comprises:
A blower housed in the housing of the outdoor unit such that the outdoor heat exchanger is arranged on the suction side, an outlet formed in the housing so as to open to the outlet side of the blower, and a front surface of the outlet. In the air conditioner provided with an outlet grill provided so as to cover, the outlet grill is formed by combining bars in a lattice shape, and is parallel or substantially parallel to the blade rear edge of the blower with respect to the blowing direction of the bars. Are alternately arranged so that the positions of adjacent ones are shifted, and the length of the alternately arranged bars is shorter than the length of the blade rear edge of the blower. A blower housed in the housing of the outdoor unit such that the outdoor heat exchanger is arranged on the suction side, and a housing that opens to the blowout side of the blower. With the outlet formed In an air conditioner provided with an outlet grill provided so as to cover the front surface of the outlet, a cross section of the outlet grill has a substantially streamline shape in a blowing direction, and a thickness of a windward end. Is characterized in that it is thinner than the thickness of the leeward end, and the blowing grill is formed so that a parting line of a forming die is formed in the thickest part of the crosspiece. It is characterized by having.

[0013]

In the air conditioner constructed as described above, the blowout grill is a lattice-shaped bar, and the bar parallel or substantially parallel to the rear edge of the blade of the blower with respect to the blowing direction is located at the position of the adjacent bar. When the trailing edge of the wing passes through a parallel or substantially parallel beam, the length of the beam on which the air blown from the trailing edge acts in the same phase is too short. The sound that is generated in the sound becomes small.
Further, the cross section of the blowout grill in the blowing direction is substantially streamlined, and the thickness of the windward end is smaller than the thickness of the leeward end, so that the blowout is blown out from the blower. Even if the direction of the wind fluctuates, the resistance to the flow of the crossbar is kept small, the noise generated due to the resistance of this crossbar becomes small, the noise generated in the outdoor unit decreases,
The noise of the air conditioner can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 is a front view of an outdoor unit, FIG. 2 is a front view of a main part, FIG. 3 is a schematic longitudinal sectional view of the outdoor unit, and FIG. 4 is a connection diagram of a heat exchange pipe of an outdoor heat exchanger. FIG. 5 is a connection diagram of a heat exchange pipe of a first modification of the outdoor heat exchanger, FIG. 6 is a connection diagram of a heat exchange pipe of a second modification of the outdoor heat exchanger, and FIG. FIG. 8 is a partially enlarged front view of the outlet grill, FIG. 9 is a partially enlarged side view of the outlet grill, FIG. 10 is a longitudinal sectional view of the outlet grill, and FIG. FIG. 12 is a cross-sectional view of a horizontal rail of the outlet grill, FIG. 12 is a characteristic diagram of noise with respect to frequency, and FIG. 13 is a cross-sectional view illustrating a state where the horizontal rail of the outlet grill is positioned obliquely to the flow of air. FIG. 14 is a cross-sectional view showing a modification of the horizontal rail of the blowout grill, and FIG. Is a cross-sectional view of a mold, FIG. 16 is a partial front view showing a modification of the outdoor unit.

1 to 11, an outdoor unit 2
Inside the vertically long housing 22, a compressor storage chamber 23 storing a compressor (not shown) forming a refrigerating cycle is provided at a lower portion, and a blower 24 is disposed above the compressor storage chamber 23. It is attached and stored. Blower 2
For example, four propeller-shaped blades 25 have a rotation speed of 600 rpm during normal operation. p. m is driven by the motor 26. An outlet 28 in which a two-stage diffused bell mouth 27 is formed is provided on the wall surface of the housing 22 where the blowout side of the blower 24 faces.

Further, the housing 22 houses an outdoor heat exchanger 29 facing the suction side of the blower 24 and having a height substantially equal to the height of the housing 22. The housing on the suction side of the outdoor heat exchanger 29 is accommodated. A suction port 30 is formed on the wall surface of the body 22 so as to cover the entire wall surface, and the outside air introduced from the suction port 30 by the operation of the blower 24 flows through the outdoor heat exchanger 29 and the blower 24 Has been reached.

The outdoor heat exchanger 29 includes a number of heat exchange fins 3.
1, a plurality of heat exchange pipes 32 are fixed horizontally, and are supported so as to be arranged in a large number in the height direction. Each heat exchange pipe 32 is connected, for example, as shown in FIG. 4 so that the heat medium of the refrigeration cycle continuously flows through each heat exchange pipe 32 and heat exchange in each section is performed uniformly. .

That is, as shown in FIG. 3, the outside air introduced from the suction port 30 is about half the size of the suction port 30,
In addition, since the air flows out of the outlet 28 which is deviated upward, there is a large difference in the amount of air passing between the upper half portion P and the lower half portion Q of the outdoor heat exchanger 29. There is also a difference. Therefore, the outdoor heat exchanger 29 is moved in the height direction in the upper part P _U , the lower part P _L of the upper half part P, and the upper part Q _U and the lower part Q of the lower half part Q.
_L , the heat medium introduced into the heat exchange pipe 32 from the inlet 33 flows in the direction of the arrow, and the heat exchange pipe 32 is connected to reach the outlet 34 to form a heat medium flow path. Have been. In this case, the upper portion P _U, Q _U lower portion with respect to P _L, may be divided in unequal distribution so as to increase the number of the heat exchange pipe 32 of Q _L.

By doing so, a large difference in heat exchange efficiency in the outdoor heat exchanger 29 is eliminated. The heat exchange pipe 32 is connected to the outdoor heat exchanger 2 shown in FIGS.
9 ', 29 ", according to the first and second modifications,
A flow path for the heat medium may be formed.

On the front side of the air outlet 28 of the housing 22,
An outlet grill 36 having a honeycomb-shaped opening 35 so as to cover the outer wall 37 has a predetermined interval between the outlet grille 36 and the outlet side outer wall surface 37 of the housing 22. And a space 38 is provided between them.

The blowout grill 36 has a rectangular frame portion 39 larger than the circular opening of the blowout opening 28 and the honeycomb-shaped opening portion 3.
5 and is formed by integral molding so that the opening area of the opening 35 is larger than the opening area of the bell mouth 26.

The honeycomb-shaped opening 35 has a horizontally long hexagonal unit opening 40 as a main part, and is configured so that a large number of the unit openings 40 can be connected. Further, among the bars forming the horizontally long hexagonal unit opening 40, the horizontal bar 41, which is the main bar, is long in the horizontal direction, and its length 1 is the length L of the blade rear edge 42 of the blade 25. It is shorter. And adjacent left and right unit openings 40
Each of the horizontal rails 41 is shifted in position, and is arranged alternately in the horizontal direction. The frame 39 of the opening 35
The opening 43 located at the most horizontal portion adjacent to the opening is a long pentagon.

On the other hand, the cross rail 41 of the blow-out grill 36 has a substantially oval streamline shape having a cross-section having a curvature different from that of the windward end and the leeward end. the cross section of the radius R _1, the cross section of the downwind-side ends has a radius R ₁ is greater than the radius R ₂ of the upwind-side ends. That is, the thickness of the crosspiece 41 at the windward end is smaller than the thickness at the leeward end. The cross-sectional shapes of the windward end and the leeward end are not limited to arcs, but may be ellipses, parabolas, or other curves. Then, as shown in FIG. 11, when the direction of the air flowing in the horizontal rail 41 is as shown by the arrow Y, the air flows upward and downward from the windward end to the leeward end of the horizontal rail 41. Flows smoothly along.

In the thus constructed embodiment, the medium is circulated through the refrigeration cycle by starting the operation of the air conditioner, and the blower 2 of the outdoor unit 21 is operated.
4, the outdoor heat exchanger 2 is operated.
Outside air flows through 9. At this time, the air that has passed through the outdoor heat exchanger 29 on the suction side of the blower 24 is sent out to the two-stage diffusion-type bell mouth 27 by the blade 25, and flows down to the outlet side while performing two-stage diffusion.

The air that has flowed down reaches a space between the blowout grill 36 and the blowout opening 28 and a space 38 between the blowout grille 36 and the blowout side outer wall surface 37 of the housing 22. The wind speed decreases due to the spread of
6 is sent out through the opening 35.

At the honeycomb-shaped opening 35 of the blowout grill 36, the trailing edge 42 of the blade 25 of the blower 24
The length 1 of the horizontal rail 41 forming a horizontally long hexagon is shorter than the length L, and the adjacent left and right horizontal rails 41 are arranged alternately in the horizontal direction with their positions shifted. It has become something. For this reason, when the trailing edge 42 of the blade 25 passes near the cross bar 41 parallel or substantially parallel to the trailing edge 42 in the blowing direction, the width of the trailing edge length L from the trailing edge 42 The air blown out in the same phase at length l
And passes through the outlet grill 36 with a length shorter than L.

Therefore, when the air blown from the trailing edge 42 of the wing passes through the transverse rail 41 parallel or substantially parallel to the trailing edge 42 of the blade, the passing noise generated by acting on the horizontal rail 41 has the same phase. Is reduced to the length l of the horizontal rail 41, and thus decreases in proportion to the decrease in the length. For example, horizontal rail 41
If the length 1 is 1/2 of the wing trailing edge length L, the wing trailing edge 42 has the same radiant energy as the length of the beam passing over the same phase is longer than the wing trailing edge length L. Since the size of the radiated noise generating part is less than half, the noise is 3 dBA
The above is reduced.

The generated noise has a peak at a specific frequency determined by the number N of blades and the number of rotations R of the blower and a higher order frequency thereof. The number R is N = 4 and R =
600r. p. In the case of m, as shown in FIG. 12, there are noise peaks at the specific frequency F ₁ = 40 Hz and its second and third higher frequencies F ₂ = 80 Hz and F ₃ = 120 Hz. In the present embodiment, what is conventionally indicated by a solid line is reduced as indicated by a dotted line.

Further, the air sent from the blower 24 to the opening 35 of the outlet grill 36 has an outflow angle that fluctuates within a range of about ± 30 degrees without being uniform at the time of being sent out, Furthermore, the air flows while expanding along the outer wall surface 37 of the housing 22 and the space between the outlet 28 and the outlet grill 36, and is sent out from the opening 35 of the outlet grill 36. For this reason, as shown in FIG. 13, there is a case where the horizontal rail 41 of the outlet grill 36 is positioned obliquely in the flow of air indicated by the arrow Y '.

At this time, since the thickness of the upwind end of the crosspiece 41 is smaller than the thickness of the downwind end, the apparent thickness of the crosspiece 41 with respect to the air flow indicated by the arrow Y 'is shown. h '
Is smaller than the apparent thickness h ″ when the thickness of the leeward end is equal to that of the leeward end. Therefore, the resistance of the cross rail 41 to the flow of air is reduced, and turbulence is generated. And noise generation is suppressed.

At this time, good results are obtained when the relationship between the radius R ₁ at the windward end and the radius R ₂ at the leeward end is in the range of 0.4R ₂ <R ₁ <0.9R _2. was gotten.

Further, as shown in a cross rail 41 'shown in FIG.
The cross-sectional shape is such that the cross section of the leeward end has a radius R ₂ , the cross section of the leeward end has a radius R ₃ smaller than the radius R ₂ of the leeward end, and a discontinuous step 44 is formed. A substantially streamline shape having a substantially oval shape may also be used. The maximum wall thickness portion of the thickness of the downwind-side ends this time 2R _2, expected type displacement when molded in conjunction mold, even looking at the outlet grille 30 'from the downstream side in case any maximum deviation The dimensional relationship is set so that the misalignment is not visible.

That is, as shown in FIG. 15, the forming die 45 of the blow-out grill 36 'is constituted by divided dies 46 and 47 in which the parting line is located at the thickest part of the horizontal rail 41'. And if the tolerance type shift during molding is s is the thickness 2R ₂ of the maximum thickness portion of the downwind-side ends of the rungs 41 ', the wall thickness of the mold 47 upwind side end portion is formed The opening dimension T in the direction is set as s> (2R ₂ −T) / 2. As a result, it is possible to provide a margin for the misalignment at the time of molding, and it is possible to improve the appearance of the blowout grill 36 '.

With the above configuration, the blower 24 that promotes heat exchange of the outdoor heat exchanger 29 housed in the housing 22 and the blower 2
The noise generated by the air outlet grille 36 provided on the outer wall 8 and the outer wall 37 can be reduced, and the outdoor unit can be reduced in noise.

In the above-described embodiment, the blowout grill 36 has the honeycomb-shaped opening 35.
As shown in FIG. 16, the length 1 of the main cross bar 50 that is parallel or substantially parallel to the wing trailing edge 42 with respect to the air blowing direction is shorter than the wing trailing edge length L as shown in FIG. The horizontal rails 50 are arranged alternately in the horizontal direction so as to be shifted from each other, and the horizontal rails 50 are provided by the vertical rails 51 provided at a coarse pitch so as not to be parallel to the blade trailing edge 42 and the blowing direction. The main beam which is parallel or substantially parallel to the wing trailing edge portion 42 with respect to the air blowing direction may be constituted by the horizontal beam 4.
The present invention can be practiced with appropriate modifications without departing from the gist, such as vertical and diagonal bars.

[0036]

As is apparent from the above description, according to the present invention, a blow-out grill provided at a blow-out opening of a blower for promoting heat exchange housed in a housing of an outdoor unit is combined with a grid-like bar to form a blower. The crosspieces that are parallel or almost parallel to the blade trailing edge of the blower with respect to the direction are arranged alternately so that the positions of the crosspieces are shifted from the adjacent ones. With this configuration, noise generated in the outdoor unit can be reduced, and the noise of the air conditioner can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an outdoor unit according to an embodiment of the present invention.

FIG. 2 is a front view of a main part of the outdoor unit according to the embodiment of the present invention.

FIG. 3 is a schematic longitudinal sectional view of an outdoor unit according to one embodiment of the present invention.

FIG. 4 is a connection diagram of a heat exchange pipe of the outdoor heat exchanger in one embodiment of the present invention.

FIG. 5 is a connection diagram of a heat exchange pipe of a first modification of the outdoor heat exchanger according to one embodiment of the present invention.

FIG. 6 is a connection diagram of a heat exchange pipe of a second modification of the outdoor heat exchanger according to one embodiment of the present invention.

FIG. 7 is a cross-sectional view of an outdoor unit according to one embodiment of the present invention.

FIG. 8 is a partially enlarged front view of a blowout grill according to one embodiment of the present invention.

FIG. 9 is a partially enlarged side view of an outlet grille according to an embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a blow-off grill in one embodiment of the present invention.

FIG. 11 is a cross-sectional view of a horizontal rail of the blowout grill according to one embodiment of the present invention.

FIG. 12 is a characteristic diagram of noise with respect to frequency in one embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a state where the horizontal rail shown in FIG. 11 is positioned obliquely to the flow of air.

FIG. 14 is a cross-sectional view showing a modified example of the horizontal rail of the blowout grill according to one embodiment of the present invention.

FIG. 15 is a cross-sectional view of a mold for the blowout grill of FIG. 14;

FIG. 16 is a fragmentary front view showing a modification of the outdoor unit according to one embodiment of the present invention.

FIG. 17 is a cross-sectional view of a main part of a conventional outdoor unit.

FIG. 18 is a front view of a main part of a conventional outdoor unit.

FIG. 19 is a partially enlarged cross-sectional view of a conventional outlet grill.

FIG. 20 is a cross-sectional view showing an example of a horizontal rail of a blow-out grill of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Outdoor unit 22 ... Case 24 ... Blower 25 ... Blade 28 ... Outlet 29 ... Outdoor heat exchanger 36 ... Outlet grille 41 ... Horizontal bar 42 ... Wing trailing edge

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seiichi Abiko 336 Tatehara, Fuji-shi, Shizuoka Prefecture Toshiba A-V E Corporation (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29 / 66 F04D 29/00 F04D 25/08 F04D 29/42

Claims (4)

(57) [Claims] 1. An air blower housed in a housing of an outdoor unit such that an outdoor heat exchanger is arranged on a suction side, and an air outlet formed in the housing so as to open to a blowing side of the air blower. In an air conditioner having an outlet grill provided so as to cover the front surface of the outlet, the outlet grill is formed by combining bars in a lattice shape, and the blades of the bars are arranged behind the blades of the blower in the blowing direction. An air conditioner characterized in that objects that are parallel or substantially parallel to the edge are alternately arranged so that the positions of adjacent objects are shifted. 2. The air conditioner according to claim 1, wherein the length of the staggered bars is shorter than the length of the blade trailing edge of the blower. 3. A blower housed in a housing of an outdoor unit such that an outdoor heat exchanger is arranged on a suction side, an outlet formed in the housing so as to open to an outlet side of the blower, In an air conditioner having an outlet grill provided so as to cover the front surface of the outlet, a cross section of the outlet grill has a substantially streamline shape in a blowing direction, and a thickness of a windward end. An air conditioner characterized in that the thickness is smaller than the thickness of the leeward end. 4. The air conditioner according to claim 3, wherein the blowout grill is formed such that a parting line of a forming die is formed at a maximum thickness portion of the crosspiece.