JPH0882427A - Indoor unit for air conditioner - Google Patents

Abstract

PURPOSE: To reduce fan air noise and pressure drop and further improve heat exchange performance by directing a fan blow-off outlet in right and left two directions and blowing air uniformly in the right and left two directions. CONSTITUTION: A fan housing 3a is adapted to have a flow passage area between two sets of heat exchangers 7A, 7B such that the flow passage area is progressively increased from left and right two tongue parts 20A, 20B in the direction of rotation of a centrifugal fan rotor 10A whereby air is blown off uniformly in the right and left two directions. Since there are at last fan blow-off outlets 8, 9 in the right and left two directions, the average wind velocity is reduced when compared with the same airflow, and an air flow blown out from the blow-off outlets 8, 9 passes substantially uniformly through the right and left heat exchangers 7A, 7B as well as it is supplied spreading uniformly over the entire of the longitudinal direction of the heat exchangers 7A, 7B to prevent a biassed flow. Hereby, air fan noise and pressure drop can be reduced and heat exchange performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a ceiling-mounted indoor unit for an air conditioner, which is mounted on the ceiling of an air-conditioned room, for example.

[0002]

2. Description of the Related Art Generally, a heat pump type air conditioner indoor unit for cooling and heating by utilizing a refrigerating cycle to adjust temperature and humidity in an air-conditioned room includes a ceiling-mounted type. 143035).

Since this type of air conditioner indoor unit is arranged on the back side of the ceiling plate, it does not require a space for arrangement in the air-conditioned room and has the advantage of not impairing the aesthetics of the room. For example, as shown in FIGS. 10 and 11, this air conditioner indoor unit has a structure in which air suction grills 11A and 11B and two air outlets 5a and 5b on both sides thereof are provided on the lower surface of the cassette casing along the ceiling plate. Has (two-way blow). Then, by rotating a centrifugal fan (so-called sirocco fan) 32 as a blower, the air suction bellmouths 37A, 37 at both ends from the air suction grilles 11A, 11B through the air suction passages 33.
The air in the air-conditioned room is sucked into the fan housing 30 from B.

The air sucked into the fan housing 30 of the centrifugal fan 32 has a pair of left and right heat exchangers 7 arranged so as to sandwich the centrifugal fan 32.
As shown by the arrow in the figure, the air is blown to the top plate 36 once with respect to A and 7B, and is then blown in such a manner that the flow is split left and right. Then, the air is heat-exchanged through the heat exchangers 7A, 7B, passes through the air outlet passages 2A, 2B provided corresponding to the respective heat exchangers 7A, 7B, and then from the air outlets 5a, 5b to the air conditioning room. Is blown out to.

[0005]

However, in the conventional two-way blow ceiling cassette type air conditioner indoor unit, the air in the room is located at the lower center of the air intake grills 11A, 1A.
1B is sucked into the fan housing 30 inside the machine,
The air is blown out from the single air outlet 31 and splits left and right on the top plate 36, and the corresponding left and right heat exchangers 7A,
After passing through 7B, it is designed to be returned to the room from the air outlets 5a and 5b provided on the left and right of the air suction grilles 11A and 11B. Therefore, when the fan blowout flow collides with the top plate 36, the turbulence of the flow on the upstream side of the heat exchangers 7A and 7B becomes large, and noise is generated. There are problems such as large pressure loss in the road.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems, and in order to achieve the same object, the present invention is provided with the following means for solving problems. ing.

That is, in the air conditioner indoor unit of the present invention, as shown in, for example, FIGS. 1 to 9, between the two sets of left and right heat exchangers 7A and 7B, suction is performed back and forth through the fan housing 3a. In a two-way blow ceiling cassette type air conditioner indoor unit provided with centrifugal fan rotors 10A, 10B having bell mouths 16A, 16B, the fan housing 3a is provided between the two sets of heat exchangers 7A, 7B. In addition, the flow passage area is gradually increased from the two right and left tongue portions 20A and 20B in the rotational direction of the centrifugal fan rotors 10A and 10B, and is configured to be uniformly blown out in the left and right directions.

Then, for example, the centrifugal fan rotor 10 is used.
The angles of the blades 10a, 10a, ... of A and 10B are formed by inclining to the rear side by a predetermined angle.

Further, the centrifugal fan rotor 10A, 1
0B center and two left and right tongues 2 of the fan housing 3a
The angle formed by the straight line connecting the vertices of 0A and 20B is less than 180 ° on the air intake side of the indoor unit and 18 on the opposite side of the indoor unit top plate 22 side.
It is configured to be larger than 0 °.

Furthermore, the centrifugal fan rotor 1 is provided from the two right and left tongue portions 20A and 20B of the fan housing 3a.
The expansion rate of the flow passage area that expands in the rotational direction of 0A and 10B is set to be larger in the fan housing on the indoor unit top plate 22 side opposite to the fan housing on the suction grille 11A, 11B side of the indoor unit. Consists of

Further, in addition to them, corners 23a to 23d, 24a to 24d on the outside of the fan housing 3a are provided.
Are formed on the rounded surface.

[0012]

The indoor unit for an air conditioner according to the present invention has the following actions corresponding to the above-mentioned configurations.

That is, as described above, in the structure of the indoor unit for an air conditioner of the present invention, two sets of left and right heat exchangers 7 are used.
Centrifugal fan rotor 1 having suction bellmouths 16A, 16B in front and back through a fan housing 3a between A and 7B
In the indoor unit for a two-way blow ceiling cassette type air conditioner provided with 0A and 10B, the fan housing 3a is provided between the left and right tongue portions 20A and 20B between the two sets of heat exchangers 7A and 7B. Centrifugal fan rotors 10A, 10
A structure in which the flow passage area gradually increases in the direction of rotation of B,
Since the fan outlets (8, 9) are located in the left and right directions, the average air velocity is low when compared with the same air volume, and the fan housing outlets (8, 9) Since the blown out air passes through the left and right heat exchangers 7A and 7B almost uniformly, it is of course superior in the ventilation noise reduction performance and pressure loss reduction performance, and the fan blowout flow as in the conventional The high pressure chamber under the top plate for dividing into two is not required, and the product can be made compact (especially the vertical height).

Further, in this case, when the angle of the blades 10a, 10a, ... Of the centrifugal fan rotors 10A, 10B is inclined rearward by a predetermined angle from the normal, the dynamic pressure is recovered as much as possible. As a result, the static pressure can be increased, and it is possible to remedy the disadvantage that it is difficult to secure the static pressure as a result of two-direction blowout.

Further, the centrifugal fan rotors 10A, 1
0B center and two left and right tongues 2 of the fan housing 3a
The angle formed by the straight line connecting the vertices of 0A and 20B is less than 180 ° on the air intake side of the indoor unit and 18 on the opposite side of the indoor unit top plate 22 side.
It is configured to be larger than 0 °, or the expansion rate of the flow passage area that expands in the rotation direction of the centrifugal fan rotors 10A and 10B from the two right and left tongue portions 20A and 20B of the fan housing 3a is taken into the indoor unit suction. Grill 11A,
If the fan housing on the side of the indoor unit top plate 22 on the opposite side is made larger than the fan housing on the side of 11B, it becomes easier to suck air into the fan housing on the side of the top plate 22. In order to suck the indoor air from the air suction port of the fan, the shape of the fan housing 3a is the fan rotors 10A and 10B.
If the shape is completely axisymmetric with respect to the rotation axis of, the amount of air that flows toward the fan housing closer to the air intake will increase, and the problem that the left and right blowout air volume may become uneven is effective. Can be improved.

Further, if each of the corner portions 23a to 23d and 24a to 24d on the outside of the fan housing 3a is formed into a rounded surface, the outlet of the fan housing 3a is blown out.
The air blown out from (8, 9) is the heat exchanger 7 as much as possible.
It is supplied so as to spread evenly over the entire front and rear direction of A and 7B, and uneven flow is prevented and heat exchange performance is improved.

[0017]

As described above, according to the indoor unit for an air conditioner of the present invention, since the fan outlets are located in the left and right directions, the average wind speed is small when compared with the same air volume.
The flow of air blown out from the fan housing outlet passes through the heat exchanger almost uniformly, so the blowing noise,
Not only is it excellent in reducing the pressure loss, but the high pressure chamber under the top plate for dividing the fan blowout flow into two, which is required in the past, is not required, so the product can be made as compact as possible. Also, the heat exchange performance itself is improved.

[0018]

【Example】

(Embodiment 1) FIGS. 1 to 4 show a second embodiment of the present invention.
1 shows the configuration of an indoor unit for a side-blown ceiling cassette type air conditioner.

In the figure, reference numeral 1 is a rectangular cassette type casing of the indoor unit.
Air blow-out passages 2A and 2B extending in the vertical direction are provided on the left and right sides in the width direction, and a centrifugal fan 3 and an air suction passage 4 are provided above and below the central portion.

The air outlet passages 2A, 2B are formed with air outlets 5a, 5b on the lower side thereof, respectively.
Wind direction plates 14a and 14b are provided at 5b.

The centrifugal fan 3 has bellmouths 16A and 16B for sucking air on both front and rear ends, and a fan housing 3a having air outlets 8 and 9 in two left and right directions.
The fan housing 3a includes a pair of front and rear fan rotors 10A, 10B rotatably provided in the center, and a fan motor 15 for driving the fan rotors 10A, 10B via drive shafts 15a, 15b. There is.

The fan housing 3a is formed in a structure in which the flow passage area is gradually expanded from the left and right tongue portions 20A (lower side), 20B (upper side) of the fan housing 3a in the rotational direction of the fan rotors 10A, 10B. The air is blown out evenly on the left and right.

The enlarged left and right outlets 8 and 9 are respectively heat exchangers 7A and 7A extending vertically.
It is made to communicate with almost the entire surface of B in the vertical direction.
The lower portions of the heat exchangers 7A and 7B are arranged on the drain pans 6a and 6b having the drain receivers on the upper side so that there is no gap between the drain pans 6a and 6b, and the drain pans 6a and 6b are
The frame members 13A and 13B on the lower surface side of the casing 1 are arranged above the frame member 13A so that there is no gap.

On the other hand, inside the frame members 13A and 13B, air suction grilles (air suction ports) 11A and 11B are provided on both left and right sides through a central partition plate (blind plate) 21. Further, an air filter 12 is provided on the upper part of the casing of each of the air suction grilles 11A and 11B.

The air sucked from the air suction grilles 11A and 11B passes through the air suction passage 4 through the air filter 12, and the pair of front and rear bell mouths 16 are provided.
The fan rotors 10A and 10B are sucked from A and 16B.

Then, the air is supplied to the fan rotor 10A,
After being blown out evenly from the air outlets 8 and 9 of the fan housing 3a to the heat exchangers 7A and 7B via 10B and being heat-exchanged by the heat exchangers 7A and 7B,
Left and right air outlets 5 via the air outlet passages 2A, 2B
It is blown into the air-conditioned room from a and 5b.

As described above, in the structure of the air conditioner indoor unit of this embodiment, the air suction bell mouth 16A, which is located between the left and right heat exchangers 7A, 7B, is provided.
Centrifugal fan rotors 10A, 10B having 16B are provided, and two tongue portions 20A, 2 on the left and right are further provided above and below the centrifugal fan rotors 10A, 10B.
The fan housing 3a whose flow passage cross-sectional area is gradually increased from the 0B portion toward the rotation direction of the fan rotors 10A, 10B is arranged.
The structure is characterized in that the air flow from the air is blown out uniformly in the two left and right directions. That is, the fan housing 3a
Since the fan outlets 8 and 9 are in the left and right directions, the average wind speed is small when compared with the same air volume, and the flow blown out from the air outlets 8 and 9 of the fan housing 3a is almost even in the heat exchanger. As it passes through, it not only excels in the ventilation noise and pressure loss reduction function, but it does not require the high pressure chamber under the top plate to divide the fan discharge flow into two, which is the size of the product itself. In particular, the height in the vertical direction can be made considerably compact. Also, the heat exchange performance is improved.

(Other Embodiments) By the way, in the indoor units shown in FIGS. 1 to 4, the upper and lower fan housings are shaped so that the fan rotors 10A and 10B are partially extended from the tongue portions 20A and 20B to the outlets 8 and 9. In order to make the heights of the left and right heat exchangers 7A, 7B equal while making the shape symmetrical with respect to the rotating shafts 15a, 15b, the asymmetrical shape (the outlet 8 was narrowed at the point P) from the middle. Shape).

However, in the indoor unit for a two-way blow ceiling cassette type air conditioner, which is the subject of the present invention, the indoor air is sucked from the air suction grills 11A, 11B below the main body side casing casing 1. Therefore, assuming that the shape of the fan housing 3a is completely axially symmetric with respect to the rotating shafts 15a and 15b of the fan rotors 10A and 10B, the right side close to the air suction grilles 11A and 11B. There is a possibility that the amount of air flowing through the fan housing portion will increase and the left and right airflow rates will not be uniform.

Therefore, as a measure against such a problem, for example, the flow path diameter in the direction of the air outlet 8 of the fan housing on the top plate 22 side far from the air intake grills 11A and 11B is increased as shown in FIG. 5 to increase the air flow. It is possible to make it.

Then, as a specific configuration for that,
For example, the angle formed by the straight line connecting the centers of the fan rotors 10A and 10B and the apexes of the two tongue portions 20A and 20B of the fan housing 3a is smaller than 180 ° on the air intake side of the indoor unit and the indoor unit on the opposite side. Is larger than 180 ° on the side of the top plate 22 of the fan housing 3a, or the expansion rate of the flow passage area expanding from the tongue portions 20A, 20B of the fan housing 3a in the rotation direction of the fan rotors 10A, 10B is set to the air suction side of the indoor unit. Than the housing
If the housing on the top plate 22 side of the indoor unit on the opposite side is made larger, air can be easily sucked into the fan housing on the top plate 22 side.

That is, in FIG. 6, the fan rotor 10 is used as the second embodiment in order to equalize the left and right blowing air amounts.
Two tongues 2 of the center of A and 10B and the fan housing 3a
The angle α formed by the straight line connecting the vertices of 0A and 20B is smaller than 180 ° on the suction side α ₂ of the indoor unit,
On the other hand, α ₁ on the indoor unit top plate 22 side α ₁ is larger than 180 °, that is, α ₁ > α ₂ .

Further, FIG. 7 shows, as a third embodiment, the fan rotor 1 from the tongue portions 20A and 20B of the fan housing 3a.
This is an example in which the expansion rate of the flow passage area that expands in the rotational direction of 0A, 10B is larger in the housing on the top plate 22 side of the indoor unit on the opposite side than the housing on the suction side of the indoor unit. The center of the rotor 10A, 10B and the two tongue portions 20A, 20B of the fan housing 3a
Straight line connecting the points closest to the fan rotors 10A and 10B
When the angle formed by the (length r ₀ ) and the center of the fan rotors 10A and 10B and the line connecting the arbitrary positions on the inner surface of the fan housing 3a is θ, the length r of the line is, for example, r = r ₀
× When expressed in e ^n.theta, the value of this n is an example in which a fan housing shape such that n _1> n _2.

Further, as a fourth embodiment, in the configuration of each of the above embodiments, preferably the fan rotors 10A, 1
The inclination angle (blade angle) of each blade 10a of 0B is the same as that of the conventional blade 32a.
A radial structure is adopted in which the inclination angle is larger by a predetermined angle toward the rear side in the rotation direction than the inclination angle (see FIG. 10). By doing so, the dynamic pressure of the blowout flow in the fan housing 3a can be recovered as much as possible to increase the static pressure, and the blowing performance can be improved.

Furthermore, as a fifth embodiment, in the configuration of each of the above embodiments, for example, each of the fan housings 3 described above is used.
It is also possible to form the outer corner portions 23a to 23d and 24a to 24d of a in a shape having a rounded surface in the horizontal direction as shown in FIG. With such a configuration, the air flow blown out from the central outlets 8 and 9 of the fan housing 3a is evenly spread and supplied to the entire front and rear direction of the heat exchangers 7A and 7B, thereby preventing uneven flow. Heat exchange performance is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view (AA in FIG. 2) of an indoor unit for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view (BB of FIG. 1) of the indoor unit for an air conditioner.

FIG. 3 is a sectional view taken along line CC of FIG.

FIG. 4 is a cross-sectional view taken along the line DD of FIG.

FIG. 5 is a horizontal cross-sectional view (principle diagram) of an indoor unit for an air conditioner in which the problems of the indoor unit for an air conditioner according to the first embodiment of the present invention are improved.

FIG. 6 is a cross-sectional view of an air conditioner indoor unit according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of an indoor unit for an air conditioner according to a third embodiment of the present invention.

FIG. 8 is a sectional view similar to FIG. 3 of the indoor unit for an air conditioner according to Embodiment 5 of the present invention.

FIG. 9 is a sectional view of the indoor unit for an air conditioner similar to FIG. 4.

FIG. 10 is a cross-sectional view of a conventional indoor unit for an air conditioner.

11 is a sectional view taken along line EE of FIG.

[Explanation of symbols]

1 is a cassette casing, 2A and 2B are air outlets, 3
Is a centrifugal fan, 3a is a fan housing, 4 is an air inlet passage, 5a and 5b are air outlet passages, 7A and 7B are heat exchangers,
8 and 9 are fan housing air outlets, 10A and 10B are fan rotors, 11A and 11B are air intake grills, and 20.
A and 20B are tongue portions, and 23a to 23d and 24a to 24d are corner portions outside the fan housing.

Claims (5)

[Claims] 1. A centrifugal fan rotor (10) having suction bell mouths (16A), (16B) in front and back through a fan housing (3a) between two sets of left and right heat exchangers (7A), (7B).
A), (10B) provided in the two-way blown ceiling cassette type air conditioner indoor unit, the fan housing (3a) is between the two sets of heat exchangers (7A), (7B). For an air conditioner characterized by a structure in which the flow passage area gradually increases from the two tongues (20A) and (20B) on the left and right in the rotational direction of the centrifugal fan rotor, and blows out evenly in the two left and right directions. Indoor unit. 2. The centrifugal fan rotor (10A), (10)
The indoor unit for an air conditioner according to claim 1, wherein the blades (10a, 10a ...) And (10a, 10a ...) of B) are inclined rearward by a predetermined angle. 3. Centrifugal fan rotors (10A), (10B) center and two left and right tongues (20) of the fan housing (3a).
The angle formed by the straight line connecting the vertices of A) and (20B) is smaller than 180 ° on the air intake side of the indoor unit, and 18 on the opposite side of the indoor unit top plate (22).
The indoor unit for an air conditioner according to claim 1 or 2, wherein the indoor unit is configured to be larger than 0 °. 4. The centrifugal fan rotor (10A) from the two right and left tongues (20A), (20B) of the fan housing (3a).
The expansion rate of the flow passage area that expands in the rotational direction of (10B) is larger than the fan housing on the suction grilles (11A), (11B) side of the indoor unit, and the indoor unit top plate on the opposite side.
The indoor unit for an air conditioner according to claim 1, 2 or 3, wherein the fan housing on the (22) side is enlarged. 5. A corner portion outside the fan housing (3a)
The indoor unit for an air conditioner according to claim 1, 2, 3 or 4, wherein each of (23a) to (23d) and (24a) to (24d) is formed on a rounded surface.