KR100878472B1 - Indoor unit of air conditioner - Google Patents

Abstract

Disclosed is an indoor unit of an air conditioner that can stably control the airflow angle and the blowing performance and prevent condensation of the blade. In the indoor unit 1 of the disclosed air conditioner, the blade 21 is rotatably installed in the discharge hole 6, and the blade 21 is spaced apart from the main blade 23 and the main blade 23, and the main body is spaced apart from the main blade 23. The sub blade 25 which rotates integrally with the blade 23 is provided. The wall portion 31 of the discharge port 6 is provided with the groove portion 32 on the negative pressure surface 23A side of the main blade 23 so as to increase the air flow toward the negative pressure surface 23A side.

Description

Indoor unit of an air conditioning unit {INDOOR UNIT OF AIR CONDITIONER}

1 is a cross-sectional view showing a schematic configuration of an indoor unit according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the discharge port of FIG. 1 and illustrates a state in which the blade is most upward.

FIG. 3 is an enlarged cross-sectional view of the discharge port of FIG. 1 and illustrates a state in which the blade is most downward.

4 is a graph showing the relationship between the air volume and the blowing sound during heating operation.

5 is a graph illustrating the relationship between fan rotation speed and air volume during heating operation.

Figure 6 is a graph showing the results of measuring the wind speed distribution and the air flow direction during the cooling operation.

7 illustrates a state in which a condensation prevention layer is provided on a sub blade.

8 shows a blade having a third blade.

9 shows a state in which the main blade side wall surface is substantially straight.

Explanation of symbols on the main parts of the drawings

1: indoor unit, 5: inlet,

6: outlet, 10: heat exchanger,

15: discharge flow path, 21: main blade (first blade),

23: sub blade (second blade), 26: bend,

31: wall portion, 32: groove portion,

51: anti-condensation layer.

The present invention relates to an indoor unit of an air conditioner.

The air conditioner cools or heats an interior by circulating a refrigerant between a heat exchanger of an outdoor unit and a heat exchanger of an indoor unit. The indoor unit is provided with a suction port for suctioning indoor air and a discharge port for discharging the heat-exchanged air into the room. Here, in the indoor unit in which the discharge port is almost immediately directed to the lower part, a blade for controlling the air flow direction of the harmonized air is installed so that the cold air is not discharged immediately downward during the cooling operation, and the warmth is heated to the indoor floor during the heating operation. The discharge direction is changed to reach.

Conventional indoor units include those disclosed in Japanese Patent Application Laid-open No. Hei 8-94160. The indoor unit is provided with a deflection guide for maintaining a constant cross-sectional area of the flow path through which the roughened air flows through the heat exchanger. The discharge port has a large curved shape so that the blade is rotatably supported. Since the discharge port is largely curved, the distance to the blade is maintained even when the blade is inclined downward during the cooling operation. As a result, the distance between the blade upper surface and the outlet end of the discharge passage facing the blade is reduced, and the resistance of the discharge port is prevented from increasing.

When the indoor unit becomes thin, it becomes difficult to secure a sufficient flow path length for discharging the rough air, and therefore, it is necessary to secure the flow path length by combining the flow path in the indoor unit with the discharge port. However, when the discharge port is largely curved as in the conventional indoor unit, when the blade is directed downward, the air flow between the blade upstream end and the curved wall surface of the discharge port is large, so that the blowing performance is easy to be degraded.

In addition, since the flow path formed by the upstream end of the blade and the discharge port wall surface increases and decreases greatly with the blade angle, it is difficult to control the airflow angle and the wind speed. In addition, the flow path of which the discharge port is largely curved may easily cause high temperature and high humidity indoor air to wind up toward the back of the blade during the cooling operation. Harmonic air flows to the blade surface, so that the blade is cooled below the dew point temperature as a whole, so that moisture in the dried air is easily condensed on the blade.

The present invention has been made in view of this point, and an object of the present invention is to provide an indoor unit of an air conditioner that can stably control the airflow angle and the blowing performance, and can prevent condensation of the blade.

In the indoor unit of the air conditioner according to the present invention for achieving the above object, in the indoor unit of the air conditioner for sucking the indoor air from the inlet port to discharge the air harmonized in the heat exchanger through the discharge port, rotatable to the discharge port A first blade for deflecting the direction of the air discharged from the discharge port, and a second blade disposed to be spaced apart from the first blade and extending to form a part of the discharge flow path and integrally rotating with the first blade. The wall portion of the discharge port facing the first blade is provided with a groove portion for increasing the distance to the first blade.

In the indoor unit of the air conditioner, the discharge direction is controlled by passing rough air mainly between the first and second blades. Since the wall portion of the discharge port toward the negative pressure side of the first blade is concave, when the first and second blades are disposed upward during the cooling operation, the amount of discharge air passing between the first blade and the wall portion increases.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in the indoor unit 1, the box-shaped unit body 2 is embedded in the ceiling 4 via the decorative panel 3. The decorative panel 3 is formed such that the outer edge portion is fixed to the ceiling surface 4, and the suction port 5 and the discharge port 6 are spaced toward the room. A filter 7 is provided in the unit body 2 inside the suction port 3, and the drain pan 8 is fixed to the inner surface of the decorative panel 3 between the suction port 5 and the discharge port 6.

Since the lower opening is closed by the decorative panel 3, the unit body 2 forms a flow path from the suction port 5 to the discharge port 6 by the space inside the unit body 2. In this flow path, the heat exchanger 10 and the blower fan 11 are sequentially arranged from the suction port 5 side. The heat exchanger 10 has a structure in which a refrigerant flows therein, and a lower end portion 10A contacts the drain pan 8. The heat exchanger 10 extends inclined upwardly from the lower end 10A above the inlet 5 and the upper end 10B is in contact with the ceiling surface of the unit body 2.

The blower fan 11 includes a throttle 13 protruding downwardly from a part of the ceiling surface of the unit body 2, a stabilizer 14 fixed to the decorative panel 13, and a scroll 16 on the unit body 2 side. The flow path between them is disposed at a reduced position, and the rotating shaft 11A extends in a direction substantially perpendicular to the flow path. The flow path from the blower fan 11 to the discharge port 6 is comprised by the discharge flow path 15 which can suppress rectification and a vortex.

The stabilizer 14 extends continuously along the axial direction of the blower fan 11, and the distance between the shape of the stabilizer 14 and the scroll 16 formed to be curved in the indoor unit 2 opposite to the stabilizer 14. Etc. are designed such that the air flow rate and speed of the air flowing through the discharge passage 15 are approximately uniform.

As shown in FIG. 2, the blade 21 is rotatably provided by the pin 22 in the discharge port 6. The blade 21 is disposed on the stabilizer 14 side, and the main blades (first blades 23 and 23) for controlling the angle of airflow, and the sub blades installed at both ends in the longitudinal direction of the main blade 23 through the connecting members 24. (Second blade 25).

The main blade 23 extends from the upstream side to the downstream side in the discharge direction of the rough air, and the downstream end portion projects from the inside of the discharge port 6 toward the interior. The downstream end has a slight inclination in cross section with respect to the upstream end. The main blade 23 may have a smooth curved shape or a straight shape.

The sub blades 25 are spaced apart from the main blades 23. The cross-sectional shape of the sub blade 25 is provided with one bent portion 26 protruding toward the main blade 23 on the upstream side in the longitudinal direction, and the upstream end portion of the sub blade 25 is farther from the main blade 23 than the bent portion 26. And an end portion downstream from the bend 26 extends substantially parallel to the main blade 23.

In accordance with the blade 21, the shape of the discharge port 6 of the decorative panel 3, that is, the shape of the discharge passage is determined. The discharge port 6 has a substantially straight line shape downward, and the wall portion 31 on the main blade 23 side forming the discharge port 6 is formed using the side wall of the drain pan 8. The wall portion 31 is formed with a groove portion 32 that bends as if the flow path is enlarged from the vicinity of the position corresponding to the upstream end when the main blade 23 is most raised. In addition, the upper height of the groove portion 32 is lower than the bent portion 26 of the sub-blade 25 arranged upward. An end portion 31A of the wall portion 31 protrudes so as to face the main blade 23.

In the wall surface on the sub blade 25 side of the flow path forming the discharge port 6, the upstream wall portion 35 leading to the unit body 2 and the downstream wall portion 36 on the outlet end side are formed different from each other. The upstream wall portion 35 is a portion opposed to the upstream end of the sub blade 25 when the main blade 23 is disposed to be the highest. The upstream wall portion 35 is an arc-shaped curved surface whose cross section is centered on the blade 21 rotational center, that is, the pin 22. The radius of the arc is slightly larger than the trajectory of rotating the upstream end of the subblade 25 or the downstream end about the pin 22.

The downstream wall part 36 is formed continuously in the upstream wall part 35, and is formed in the inclined surface inclined in the direction which increases the opening width of the discharge port 6. As shown in FIG. The downstream wall portion 36 may be a curved surface having an arc different from that of the upstream wall portion 35 instead of the inclined surface.

FIG. 2 shows the arrangement when the blade 21 is rotated to raise most. At this time, the bent portion 26 of the sub blade 25 is disposed higher than the upstream end of the main blade 23, and the upstream end of the sub blade 25 has the wall surface of the discharge flow path 15 of the unit body 2. Approximate to 16A). At this time, the downstream end of the sub blade 25 is continuous to the discharge port 6 wall portion 36 of the decorative panel 3. As a result, the subblade 25 becomes a part of the discharge flow path 15 to form an inclined flow path wall surface on the outlet side.

As shown in FIG. 3, when the blade 21 is rotated downward, the upstream end of the subblade 25 is lower than the upstream end of the main blade 23. An end portion downstream from the bent portion 26 of the sub blade 25 is disposed at an approximately extended line of the wall surface 16A of the discharge passage 15 of the unit body 2. As a result, the subblade 25 becomes a part of the discharge passage 15, and forms a substantially straight passage wall surface downward along the discharge passage 15.

As shown in FIG. 3, the difference Δθ (= θ1-θ2) between the angle θ1 at which the main blade 23 is downward with respect to the horizontal line and the angle θ2 at the highest angle as in the example of FIG. 2 is represented by the subblade 25. It is approximately coincided with the angle θs formed by two straight lines connecting the upper and lower ends and the rotational center, respectively. Thereby, the flow (secondary flow) of the airflow flowing near the upstream wall part 35 can be minimized. Moreover, since the space | interval between the sub blade 25 and the wall parts 35 and 36 becomes small, it is possible to reduce blowing noise.

Next, the operation according to the present embodiment will be described.

When heating the air conditioner including the indoor unit 1, the gas refrigerant pressurized by the compressor of the outdoor unit is introduced into the heat exchanger 10 of the indoor unit 1. At the same time, the blower fan 11 is operated to suck in the indoor air from the suction port 5. The air sucked into the flow path of the indoor unit 1 passes through the heat exchanger 10 through the filter 7 and exchanges heat with the refrigerant in the heat exchanger 10. Air is heated by the heat released when the refrigerant condenses. In this way, the air whose temperature is controlled flows into the discharge passage 15 from the blower fan 11 and is discharged into the room through the discharge port 6 of the decorative panel 3 while rectifying the wind speed distribution or the air volume to be approximately uniform.

At this time, the indoor unit 1 moves the blade 21 downward as shown in FIG. 3. The downstream ends of the main blade 23 and the sub blades 25 are arranged to be approximately parallel with the flow of the conditioned air. This creates a downward airflow and heats the room. A part of the conditioned air flows between the main blade 23 and the wall 31, that is, toward the negative pressure surface 23A of the main blade 23.

In the cooling operation, the gas refrigerant pressurized by the compressor of the outdoor unit is liquefied in the heat exchanger of the outdoor unit and then introduced into the heat exchanger 10 of the indoor unit 1. The air sucked into the flow path of the indoor unit 1 by the blowing fan 11 through the filter 7 passes through the heat exchanger 10 and exchanges heat with the refrigerant in the heat exchanger 10. The air is cooled by the heat it takes away when the refrigerant evaporates. In this way, the air whose temperature is controlled flows into the discharge passage 15 from the blower fan 11, and is rectified to have a substantially uniform wind speed distribution or air volume, and is discharged into the room through the discharge port of the decorative panel 3.

At this time, the indoor unit 1, as shown in Figure 2, the blade 21 is upward. The discharge direction of the air harmonized by the main blade 23 and the sub blades 25 is deflected, and the rough air is discharged inclined. Since the upstream end of the sub blade 25 is disposed close to the upper end of the curved upstream wall portion 35 of the wall surface, the harmonized air is discharged mostly into the room without passing between the sub blade 25 and the upstream wall portion 35. On the other hand, since the groove portion 32 is provided in the wall portion 31 on the main blade 23 side, the rough air flows between the main blade 23 and the wall portion 31, that is, toward the negative pressure surface 23A of the main blade 23. The amount is increased. As a result, although the discharge direction is deflected by the blade 21, the discharge flow rate is secured. In addition, condensation of the main blade 23 is prevented because high temperature and high humidity air in the room is not rolled toward the negative pressure surface 23A of the main blade 23.

According to the present embodiment, the blade 21 is provided with a sub blade 25 which rotates integrally with the main blade 23 so that the sub blade 25 passes through the outlet flow path of the discharge passage 16 in response to the operation state. Because of deflection, stable airflow angle can be obtained during cooling operation and heating operation, and the blowing performance can be stabilized. Therefore, the room temperature can be comfortably adjusted.

Since the groove part 32 is provided in the flow path in the discharge port 6, the airflow which flows toward the negative pressure surface 23A of the main blade 23 at the time of cooling operation can be increased, and the dew condensation of the main blade 23 can be prevented. have.

4 to 7 show the results of experiments with the blowing sound or the air volume using the indoor unit (1). 4 and 5 are the measurement results of the blade angle, that is, the downward direction during the heating operation, Figure 4 shows the relationship between the air volume and the blowing sound. 5 shows the relationship between the fan rotation speed and the air volume. 6 and 7 are the results of the blade angle, that is, the measurement result in the upward direction during the cooling operation, and show the relationship between the air volume and the blowing sound, and the fan speed and the air volume, respectively. 4 to 7, as a comparison, measurement results of a conventional indoor unit having only one blade are displayed together.

As shown in FIG. 4, the blowing sound of the indoor unit 1 during the heating operation was smaller than the blowing sound of the conventional indoor unit within the range of the measured air volume. That is, the indoor unit 1 quietly discharges the rough air and improves comfort. As shown in FIG. 5, the air volume of the indoor unit 1 was larger than that of the conventional indoor unit within the range of the measured fan rotation speed. That is, although the indoor unit 1 has two blades 21, the operation efficiency is better than the conventional indoor unit.

6 is a result of measuring the discharge speed distribution and the air flow direction of the harmonized air during the cooling operation. The discharge speed was measured at the downward distances L1 and L2 from the discharge port 6, respectively, and the measurement was performed at a plurality of horizontal directions with the outlet end of the discharge port 6 as a zero point. 6 is shown inverted up and down for easy understanding. Moreover, distance L1 is about 50 mm, and distance L2 is about 100 mm. The peak position of the wind speed at the distance L1 was almost unchanged between the indoor unit 1 and the conventional indoor unit. However, the wind speed distribution of the indoor unit 1 is slightly larger in the region where the horizontal distance is short, that is, close to the exit end in the horizontal direction. This is because the airflow discharged between the wall portion 31 and the blade 21 increases by providing the groove portion 32 in the discharge port 6. The wind speed distribution at the distance L2 has a peak in an area in which the indoor unit 1 is far in the horizontal direction compared with the conventional indoor unit. This is because air conditioned by the blade 21 is discharged inclined more than before. That is, as shown by the solid line arrow in the drawing, the air flow direction of the indoor unit 1 is discharged inclined in a horizontal direction more than the air flow direction of the conventional indoor unit (arrow direction indicated by the broken line). This improves comfort because it prevents cold conditioning air from directly touching people during cooling operation.

Modifications of the present embodiment will be described with reference to FIGS. 7 to 9.

As illustrated in FIG. 7, a condensation preventing layer 51 is provided on an outer surface of the sub blade 25. The condensation prevention layer 51 may be a method of planting hair or installing a heat insulating material. If the condensation preventing layer 51 is provided, condensation on the sub blades 25 can be prevented.

As shown in FIG. 8, a plurality of third blades 52 rotatably supported by the main blade 23 and the sub blade 25 may be arranged intermittently in the longitudinal direction of the blade 21. Since the third blade 52 may be rotated so as to intersect with respect to the discharge direction of the airflow about the rotation shaft 53, the third blade 52 may control the discharge angle of the airflow also in the longitudinal direction of the blade 21. The dew condensation prevention layer 51 of the sub blade 25 may or may not be provided.

As shown in FIG. 9, the discharge port 6 toward the main blade 23 may be a substantially straight wall portion 55. This wall portion 55 is formed in such a way that the stabilizer 14 extends downward. In this case, the position of the wall part 55 is set so that sufficient airflow may pass between the wall surface 55 and the negative pressure surface 23A of the main blade 23 to prevent condensation.

The present invention is not limited to the above-described embodiments, but may be widely applied. For example, the configuration or arrangement of the indoor unit 1 is not limited to the illustrated form, and the indoor unit 1 is not limited to the form provided on the ceiling surface.

As described in detail above, according to the present invention, since the first and second blades are integrally rotatably provided in the discharge port, the discharge direction is controlled, and the discharge angle is appropriately achieved during the cooling operation and the heating operation. Can be. That is, the control of the airflow angle and the blowing performance can be performed stably.

In addition, since the groove is provided in the wall portion of the discharge port facing the first blade, the flow rate flowing between the first blade and the wall portion during the cooling operation can be increased, and condensation of the first blade can be prevented.

Claims (3)

In the indoor unit of the air conditioner for sucking the indoor air from the suction port and discharges the air matched by the heat exchanger through the discharge port, A first blade rotatably installed in the discharge port, the first blade deflecting the direction of the air discharged from the discharge port, spaced apart from the first blade, extending to form a part of the discharge flow path, and integrally rotating with the first blade A second blade, The wall portion of the discharge port facing the first blade is provided with a groove portion for increasing the distance to the first blade, The second blade is bent in the direction in which the upstream end is spaced apart from the first blade, the wall portion of the discharge port is formed in a substantially arcuate concave so as to correspond to the rotational trajectory of the upstream end Indoor unit. delete The method of claim 1, The indoor unit of the air conditioner, characterized in that the second blade is provided with hair or heat insulation layer.

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