JP4980440B2 - Air conditioner - Google Patents

Description

  The present invention relates to a ceiling cassette-embedded air conditioner, and relates to a technique for preventing condensation on an air outlet during cooling operation by improving a vane (wind direction deflecting plate) shape and an air outlet shape.

  Conventional ceiling cassette-embedded air conditioners have a high air flow rate outside the flow channel upstream of the air outlet, which may cause condensation around the air outlet and the wind direction adjusting plate and dirt on the ceiling. Therefore, in addition to the main wind direction adjusting plate, along the flow direction in the upstream flow path, a sub wind direction adjusting plate arranged from the outside of the flow path to the inside is provided, and the air flow with a high flow velocity is decelerated, There has been proposed an air conditioner that reduces airflow turbulence by making the air flow velocity in the flow path uniform (see, for example, Patent Document 1).

  Further, in the conventional ceiling cassette embedded air conditioner, the shape of the outlet for blowing air into the room is rectangular. When the air outlet is rectangular, the wind speed on the outer wall side increases due to the difference in the air volume distribution between the outer wall side and the inner wall side.

  In addition, in order to prevent condensation on the wind direction change plate without deteriorating the air blowing performance and to improve the reliability of the flocking-less wind direction change plate, it has a blower outlet on the lower surface, and when the blower outlet is fully open, It is equipped with a wind direction changing plate that is substantially the same surface, and a curved air passage enlargement portion is provided on the blowing circuit wall portion facing the upstream end surface of the air direction changing plate, and further, the air passage enlargement portion is provided downstream of the air passage enlargement portion. There has been proposed an air conditioner that protrudes further toward the wind direction changing plate suction surface side than the extension line of the blowing circuit wall portion upstream (see, for example, Patent Document 2).

  Furthermore, the cross-sectional shape of the inner and outer flow passage walls that form the air outlet is a rounded surface that is directed from the vertical direction to the horizontal direction, and the airflow guide vanes of the rounded surface that are directed from the vertical direction to the horizontal direction between the flow passage walls. The curvature radius r1 of the outer flow path wall, the curvature radius r3 of the inner flow path wall, and the curvature radius r2 of the blade are set in a relationship of r1 ≦ r2 ≦ r3, and the blade At the time of horizontal blowing, the distribution ratio of the air volume Q1 flowing through the outer flow path defined by the blades and the air flow volume Q2 flowing through the inner flow path so that there is no condensation on the downstream side downstream portion thereof is approximately 1.5 ≧ Q1 / Q2 ≧ An air blowing structure of an air conditioner that can be controlled to 1 and that does not cause airflow separation downstream of the rear surface side of the blades and is less likely to cause dew condensation has been proposed (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 10-325595 Japanese Patent Application Laid-Open No. 11-101483 Japanese Patent Laid-Open No. 11-118233 JP-A-11-105550

Since the conventional air conditioner is configured as described above, it has the following problems.
a. The air conditioner of Patent Document 1 requires twice as many vanes and driving devices, and is expensive.
b. The air conditioner having a rectangular cross-sectional shape of the air outlet has a large wind speed on the outer wall side, and the wind speed distribution in the air outlet is not uniform.
c. The air conditioner of Patent Document 2 can prevent condensation at the center of the air outlet, but cannot prevent condensation on both sides of the air outlet at a low wind speed.
d. Although the air conditioner of Patent Document 3 can prevent the condensation of the blades, it cannot be said that the prevention of the condensation near the air outlet is sufficient.

  The present invention has been made to solve the above-described problems. An air conditioner that can prevent condensation on the air outlet during cooling operation by improving the vane (wind deflector) shape and the air outlet shape. The purpose is to provide.

  The air conditioner according to the present invention is installed on a ceiling or the like of a room, and is provided with a decorative panel so as to close an open surface of the outer box, and a plurality of air outlets including an inner air passage wall and an outer air passage wall, In an air conditioner having an indoor unit that is provided with a suction port facing the lower surface, the air outlet has a shape in which the length of the side wall side of the outer box is longer than that of the inner side.

  The air conditioner according to the present invention can suppress turbulence and separation caused by the velocity gradient due to the above configuration, thereby reducing the entrainment of indoor air and preventing condensation near the air outlet. In addition, noise caused by pressure fluctuations can be reduced due to non-uniformity, disturbance, and separation of the wind speed distribution.

It is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view of the indoor unit 20 of a ceiling cassette embedded type air conditioner. It is a figure which shows Embodiment 1, and is an enlarged view of blower outlet 10 vicinity. It is a figure which shows Embodiment 1, and is an enlarged view of blower outlet 10 vicinity. FIG. 5 shows the second embodiment and is a partial plan view of the decorative panel 1. It is a figure which shows Embodiment 3, and is an enlarged view of the blower outlet 10 vicinity. FIG. 10 is a diagram showing the third embodiment and is a perspective view of an inner air passage wall 8. It is a figure which shows Embodiment 4, and is an enlarged view of the blower outlet 10 vicinity.

Embodiment 1 FIG.
1 to 3 are diagrams showing the first embodiment. FIG. 1 is a longitudinal sectional view of an indoor unit 20 of a ceiling cassette embedded air conditioner, and FIGS.

  The overall configuration of the indoor unit 20 of the ceiling cassette-embedded air conditioner will be briefly described with reference to FIG. In the indoor unit 20, the decorative panel 1 is abutted and joined so as to block the opened surface of the outer box 16 having the heat insulating material 17 applied to the inner surface, and the ceiling panel is attached to the ceiling through a mounting bracket (not shown) with a fixing bolt. Fixed to the wall. An indoor blower 5 that drives a turbo fan 5a by a fan motor 5b is provided near the center of the inside of the outer box 16. The indoor blower 5 sucks indoor air through the grill 11, the filter 12, and the bell mouth 13 of the suction port 7, and discharges high-pressure air into the primary side space 14. The high-pressure air passes through the indoor heat exchanger 4, enters the secondary side space 15, and is blown out into the room from the outlet 10. The air outlet 10 formed in the decorative panel 1 includes an inner air passage wall 8 and an outer air passage wall 9. Further, the air outlet 10 is provided with a vane 2 (wind direction deflecting plate) for deflecting the wind direction of the air blown into the room. A drain pan 3 that receives drain water generated in the indoor heat exchanger 4 by the operation of the air conditioner is installed below the indoor heat exchanger 4.

  A feature of the embodiment of the present invention is the shape of the vane 2. Hereinafter, this will be described with reference to the drawings. As shown in FIG. 2, the upstream side portion of the vane 2 that is provided at the outlet 10 and deflects the wind direction of the air blown into the room is away from the inner air passage wall 8 (the vane 2 is upward in the horizontal direction). ) To form a bent portion 2a.

  By configuring the vane 2 as described above, the air passage area inside the vane 2 (on the right side of the vane 2 in FIG. 2) can be secured even when the angle of the vane 2 is set in the horizontal direction. The wind speed of the part does not decrease, and there is little risk of entraining room air. Thereby, for example, during cooling operation, it is possible to prevent condensation on the vane 2 due to mixing of indoor air having a high temperature and blowing air having a low temperature.

  Further, since the shape and length of the vane 2 as a whole are not changed, the vane 2 serves as a shutter for the outlet 10 when the indoor unit 20 is stopped, and the length of the vane 2 in the short direction is shortened. Since the space | gap of the blower outlet 10 becomes small compared with what has the same effect once, the design property improves.

  As shown in FIG. 3, the curvature of the upstream portion of the vane 2 that deflects the air direction of the air blown into the room is reduced in the direction away from the inner air passage wall 8 (the vane 2 is upward in the horizontal direction). May be bent. In this case, the effect of the bent portion 2b having a reduced curvature is the same as that of FIG.

Embodiment 2. FIG.
FIG. 4 is a diagram showing the second embodiment, and is a partial plan view of the decorative panel 1.
As shown in FIG. 4, the present embodiment is characterized in that the shape of the air outlet 10 is a trapezoid having a long side on the outside and a short side on the inside. As shown in FIG. 1, since the blown air is turned about 90 ° at the side wall of the outer box 16 after leaving the indoor heat exchanger 4, the air flows along the side wall of the outer box 16. The air volume on the side wall increases. By adopting a trapezoidal shape that matches the air volume distribution, the non-uniformity of the wind speed distribution of the air blown from the air outlet 10 can be alleviated. Thereby, since the disorder | damage | failure and peeling which arise with a speed gradient can be suppressed, the entrainment of indoor air reduces and the condensation near the blower outlet 10 can be prevented. In addition, noise caused by pressure fluctuations can be reduced due to non-uniformity, disturbance, and separation of the wind speed distribution.

  The trapezoidal shape of the air outlet 10 is shown. However, as long as the length of the side wall side of the outer box 16 of the air outlet 10 is longer than the inside, a shape other than the trapezoid may be used.

Embodiment 3 FIG.
5 and 6 are diagrams showing the third embodiment. FIG. 5 is an enlarged view of the vicinity of the air outlet 10 and FIG. 6 is a perspective view of the inner air passage wall 8.

  As shown in FIGS. 5 and 6, both end portions in the longitudinal direction of the inner air passage wall 8 are greatly recessed compared to the central portion in the longitudinal direction. When the cross-sectional shape of the blower outlet 10 is made uniform in the longitudinal direction of the blower outlet 10, the air volume of the blown air is large at the central portion in the longitudinal direction and decreases at both ends in the longitudinal direction. Therefore, both the longitudinal ends of the inner air passage wall 8 are recessed compared to the central portion in the longitudinal direction, and the air flow area is increased to ensure the air volume at both longitudinal ends. This increases the wind speed at both ends in the longitudinal direction and makes it difficult for room air to be entrained, thereby preventing condensation at both ends of the outlet.

  Moreover, since the flow along the inner air passage wall 8 collides with the vane 2 by denting both ends in the longitudinal direction, the flow does not peel on the vane 2 and dew condensation on the vane 2 is also caused. Can be prevented.

Embodiment 4 FIG.
FIG. 7 is a diagram showing the fourth embodiment, and is an enlarged view of the vicinity of the air outlet 10.
As shown in FIG. 7, the outer air passage wall 9 has the same cross-sectional shape in the longitudinal direction, and the cross-sectional shape is composed of two arcs. The relationship between the radius R1 of the upstream arc and the radius R2 of the downstream arc By setting R1> R2, the blown air is peeled off at a point P1 (intersection of the upstream arc and the downstream arc) on the outer air passage wall 9.

  On the other hand, the indoor air is attracted toward the outlet 10 by the flow of the blown air, and this flow is separated at the end point P2 of the arc having the curvature R2. By securing the distance between P1 and P2 (for example, 10 mm or more), the mixing of the blown air and the entrained air is eliminated, and the temperature gradient on the surface of the outer air passage wall 9 becomes gentle. The above condensation can be prevented.

  Each embodiment is effective even when used alone, and more effective when combined.

1 decorative panel, 2 vane, 2a bent part, 2b bent part with reduced curvature, 3 drain pan, 4 indoor heat exchanger, 5 indoor blower, 5a turbo fan, 5b fan motor, 7 suction port, 8 inner air passage wall, 8a Recess, 9 Outer air passage wall, 10 Air outlet, 11
Grill, 12 filter, 13 bell mouth, 14 primary side space, 15 secondary side space, 16 outer box, 17 heat insulating material, 20 indoor unit.

Claims (3)

Installed on the ceiling of the room, etc., provided with a decorative panel so as to block the open side of the outer box, and provided with a plurality of outlets consisting of inner and outer air channel walls, and suction ports facing the lower surface In an air conditioner having an indoor unit
The suction port is a substantially square suction port having a predetermined length side provided in the center of the decorative panel;
The plurality of air outlets are four air outlets to which vanes for deflecting the air direction of air are attached,
The outlet is provided in parallel to the side of the suction port, and is provided from one end to the other end of the side of the suction port,
Air conditioner, characterized in that the shapes of said vanes of said air outlet, the length of the side wall of the outer box has a longer trapezoid than the length of the inner. The trapezoid has a trapezoidal shape that matches the air volume distribution between the air volume on the side wall side of the outer box and the air volume on the inner side, and the air outlet relaxes nonuniformity in the wind speed distribution of the blown-out air. The air conditioner according to claim 1. The air conditioner according to claim 1 or 2, wherein both end portions in the longitudinal direction of the inner air passage wall are recessed from a central portion in the longitudinal direction .

Images