JP6771339B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner.

As a structural example of the indoor unit of the conventional air conditioner, for example, there is one shown in FIG. 1 of Patent Document 1. The indoor unit of the air conditioner has an indoor heat exchanger (5), a once-through fan (12), inside the housing (1) of the indoor unit in which the suction port (2, 3) and the outlet (8) are formed. It is configured to store the pre-filter (4) and the like. In addition, a front nose (6) and a back nose (7), which are fan casings, are arranged around the once-through fan (12) to separate the suction port (2, 3) area and the air outlet (8) area. It is separated. The length between the vertical axes of the once-through fan (12) is defined by the two left and right side walls, and the ventilation passage is formed by the two left and right side walls.

When the once-through fan (12) rotates, a circulation vortex is generated inside the once-through fan (12), and the negative pressure of the circulation vortex sucks indoor air from the suction ports (2, 3). Then, heat is exchanged between the sucked indoor air and the refrigerant flowing through the indoor heat exchanger (5) to generate harmonized air, and the harmonized air is blown out from the outlet (8) to air-condition the room.

Japanese Unexamined Patent Publication No. 2011-185273 (Fig. 1 etc.) JP-A-1999-257275 (Fig. 1, Fig. 2, etc.)

By the way, during the cooling operation, the air outlet (8) is a place where the air cooled by the heat exchanger (5) (hereinafter referred to as cold air) and the high temperature and high humidity air in the room are mixed. The air near the outside of the casing may be cooled below the dew point, causing dew condensation on the outer wall surface of the fan casing. Normally, the cold air and the indoor air are mixed in a short time with a certain size of space, so that no dew condensation occurs. However, in rare cases, dew condensation may occur near the front nose (6) that constitutes the stabilizer that is a part of the fan casing, and this water droplet may be released into the room by blowing air.

Further, the once-through fan (12) is blown by the circulation vortex generated inside the once-through fan (12), but the flow of the circulation vortex is disturbed by the influence of the wall friction of the air flow at the side wall portions on both sides of the once-through fan (12). Destabilize. Further, since the shape of the ventilation path is different from the others in the portion where the motor shaft and the bearing for rotating the once-through fan (12) are arranged, the ventilation tends to be unstable.

Due to these factors, a once-through fan is used under conditions where the ventilation resistance of the ventilation path increases, such as when dust accumulates on the pre-filter (4) or indoor heat exchanger (5) of the air conditioner over time. Ventilation stability is lost from both ends in the axial direction of (12), and high-humidity air in the room easily flows into the vicinity of the front nose (6). The air that has flowed into the vicinity of the front nose (6) is cooled and condensed, and the condensed water may be discharged into the room by blowing air. In addition, when the air is unstable, the air is not constantly blown, so that water droplets adhering to the outer surface of the front nose (6) are likely to be discharged into the room due to irregular air blowing.

In Patent Document 1, by providing a plurality of slits (21) having different shapes on the surface of the front nose (6) facing the once-through fan (12), leakage from the discharge side to the intake side at each slit (21) position. Change the flow rate and direction of the flow. Then, by making the interference position between the leakage flow in each slit (21) and the blade of the once-through fan (12) different, the correlation area of the pressure fluctuation is reduced, and the noise of the once-through fan (12) is reduced while the ventilation performance is high. It is decreasing. However, no measures have been taken when dew condensation occurs near the front nose (6) and the water droplets are released into the room.

In Patent Document 2, the surface of the front nose (12) facing the once-through fan (9) is enlarged in the circumferential direction of the once-through fan (9) to form a concave surface portion (12b), which is formed around the front nose (12). The vortex flow is stored in the concave part (12b) to stabilize it. As a result, the aerodynamic performance is improved and the blowing noise is reduced. However, when the surface of the front nose (12) facing the once-through fan (9) is expanded in the circumferential direction of the once-through fan (9) to form the concave surface portion (12b), the back casing of the enlarged portion is formed during the cooling operation. The air near the surface facing (10) stagnates. The stagnant air is cooled by the expansion part and condenses, causing the water droplets to be released into the room, and the surface of the front nose (12) facing the once-through fan (9) is expanded to reduce the opening area and the fan. There is a problem that the input increases.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a highly reliable air conditioner in which dew drips and dew splashes are less likely to occur when dew condensation occurs in the vicinity of the stabilizer.

In order to solve the above-mentioned problems, the first air conditioner of the present invention has a once-through fan formed by connecting a plurality of fan elements in the axial direction and arranged below the once-through fan along the axial direction of the once-through fan. The indoor unit is provided with a stabilizer and a back casing that covers the once-through fan from behind, and a groove is provided on the surface of the stabilizer opposite to the surface facing the once-through fan, and the stabilizer is provided near the side wall surface of the indoor unit. The stabilizer has an extension portion formed by extending along the circumferential direction of the once-through fan, and the groove portion is formed in the extension portion .

The second air conditioner of the present invention includes a once-through fan formed by connecting a plurality of fan elements in the axial direction, a stabilizer arranged below the once-through fan along the axial direction of the once-through fan, and the once-through fan. The indoor unit is provided with a back casing that covers the stabilizer from the rear, and the surface of the stabilizer opposite to the surface facing the once-through fan is formed so that the central portion thereof is higher than the end portion along the axial direction of the once-through fan. ing.

According to the present invention, it is possible to provide a highly reliable air conditioner in which dew dripping and dew skipping are less likely to occur when dew condensation occurs in the vicinity of the stabilizer.

The front view which shows the air conditioner which concerns on Embodiment 1 of this invention by cutting out a part of the front panel. FIG. 1 is a cross-sectional view taken along the line II of FIG. 1 at the axial end of the once-through fan 12 of the indoor unit 100 of the air conditioner according to the first embodiment. (A) is a bottom view seen from the outlet side of the indoor unit of the air conditioner, and (b) is a bottom view seen from the outlet side of the indoor unit of the air conditioner of another example. A perspective view of the axial end of the once-through fan seen from the diagonally lower rear side of the air outlet of the front nose in the vicinity of the I-I cross section of FIG. Bottom view of the front nose seen from the outlet side in the vicinity of the I-I cross section of FIG. 1, which is one of both ends in the axial direction of the once-through fan. The graph which shows the result of having compared the retention amount of the water drop on the extension part by the presence or absence of a groove part in the case of dew condensation on the surface of the extension part of the front nose opposite to the surface facing the once-through fan. The figure which looked around the extension part of the front nose of the Example of Embodiment 1 in the axial direction of a once-through fan. A view of the extension of the front nose of Comparative Example 1 in the axial direction of the once-through fan. A perspective view of the vicinity of the air outlet of the front nose in the I-I cross section of FIG. 1 at both ends in the axial direction of the once-through fan of the indoor unit of the indoor unit of the air conditioner according to the second embodiment of the present invention, as viewed from diagonally below. (A) is a perspective view seen from the lower right including the II-II cross section of FIG. 1 of the indoor unit of the air conditioner according to the third embodiment of the present invention, and (b) faces the once-through fan of the stabilizer of the third embodiment. Schematic diagram of the surface opposite to the surface to be viewed from the front.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The present invention is not limited to the embodiments.
<< Embodiment 1 >>
FIG. 1 is a front view of the air conditioner C according to the first embodiment of the present invention, with the front panel partially cut out.
FIG. 2 is a cross-sectional view taken along the line II of FIG. 1 at the axial end of the once-through fan 12 of the indoor unit 100 of the air conditioner C of the first embodiment.
FIG. 3 (a) is a bottom view seen from the air outlet 3 side of the indoor unit 100 of the air conditioner C, and FIG. 3 (b) is the air outlet 3 of the indoor unit 100 of the air conditioner C of another example. It is a bottom view seen from the side.
FIG. 4 is a perspective view of the axial end of the once-through fan 12 seen from the diagonally lower rear side of the outlet 3 of the front nose 16 in the vicinity of the I-I cross section of FIG.

The indoor unit 100 of the air conditioner C of the first embodiment is installed in a room where air conditioning is performed.
A once-through fan 12 for sucking in indoor air and discharging it after air conditioning is provided in a substantially central portion of the indoor unit 100 shown in FIGS. 1 and 2. The once-through fan 12 is composed of a plurality of fan blades 13 (see FIG. 4).

A front panel 1 of a front plate is provided on the front side of the indoor unit 100. As shown in FIG. 2, the front panel 1 is pivotally supported at the lower part of the indoor unit 100 so that the upper part can be opened. The front panel 1 rotates around the lower part as a fulcrum to open the upper part, and the first suction port s1 is formed.
An upper surface grill 2 forming the second suction port s2 is provided on the upper surface side of the indoor unit 100. The upper surface grill 2 is configured to be ventilated in a grid pattern.

During the operation of the air conditioner C, as shown in FIG. 2, the indoor unit 100 draws air from the first suction port s1 in which the front front panel 1 is opened and the second suction port s2 in the upper grill 2 respectively. Inhale like F1 and F2. Then, the indoor unit 100 discharges the air after air conditioning by the heat exchangers (10, 11) (hereinafter, referred to as conditioned air) from the outlet 3 in the direction of arrow F3.
A crosswind direction plate 4 is provided on the lower surface side of the indoor unit 100. The crosswind direction plate 4 rotates around the axis 4j (arrow α1 in FIG. 2), and the air outlet 3 is opened and closed. The crosswind direction plate 4 is a member that changes the wind direction of the conditioned air discharged from the outlet 3.

A pre-filter 5 is provided just inside the front panel 1 and the upper grill 2. The pre-filter 5 is attached to the filter frame 6 (see FIG. 1). The pre-filter 5 removes dust contained in the air in the air-conditioned room.
As shown in FIG. 1, a filter cleaning mechanism 7 is provided on the outside of the pre-filter 5. The filter cleaning mechanism 7 removes dust and the like by moving horizontally on the pre-filter 5 while sweeping in the longitudinal direction (horizontal direction) of the indoor unit 100.

Inside the pre-filter 5, a front side heat exchanger 10 arranged on the front side and a back side heat exchanger 11 arranged on the back side are arranged. The front side heat exchanger 10 and the rear side heat exchanger 11 are composed of heat exchange fins 8 and a refrigerant pipe 9, respectively. The refrigerant of the heat medium of the refrigeration cycle flows through the refrigerant pipe 9. A large number of heat exchange fins 8 that expand the surface area are formed around the refrigerant pipe 9 in order to promote heat exchange between the refrigerant and the outside air.

The front side heat exchanger 10 and the back side heat exchanger 11 are arranged so as to surround the once-through fan 12 from the front side to the back side. When the once-through fan 12 rotates in the direction of the arrow α2 in FIG. 2, the air sucked into the indoor unit 100 is heat-exchanged in the order of the front side heat exchanger 10 and the rear side heat exchanger 11, and the heat exchange is performed. Air-conditioned air is expelled from the outlet 3 as shown by arrow F3.

<Front casing 14 and back casing 15>
As shown in FIGS. 2 and 4, the once-through fan 12 is surrounded by a front casing 14 at the front lower portion and a back casing 15 at the rear lower portion. A front nose 16 and a back nose 17 are formed at the tips of the front casing 14 and the back casing 15, respectively. A stabilizer 18 is formed by having a front casing 14 and a front nose 16. The stabilizer 18 closes the front side of the air outlet 3 to prevent the indoor air from flowing into the indoor unit 100 and to prevent the air sucked into the indoor unit 100 from flowing out into the room. As a result, the circulating vortex U (see FIG. 2) generated by the rotation of the once-through fan 12 (arrow α2 in FIG. 2) can be stably maintained.

The once-through fan 12 is located so as to be sandwiched between the front nose 16 and the back nose 17. The front nose 16 formed on the front casing 14 is arranged near the front side of the once-through fan 12 to prevent indoor air from flowing into the indoor unit 100, and also to prevent indoor units from flowing into the indoor unit 100 from the first and second suction ports s1 and s2. The air sucked inside the 100 is prevented from flowing out.

As shown in FIG. 2, the stabilizer 18 having the front casing 14 and the front nose 16 forms the air flow of the circulation vortex U by the rotation of the once-through fan 12 in the arrow α2 direction, and the first and second suction ports s1 and An air flow is formed in which indoor air is sucked in from s2 and air conditioned by heat exchangers (10, 11) is discharged from the air outlet 3 from the air outlet 3.

The back nose 17 formed in the back casing 15 is arranged near the back side of the once-through fan 12, prevents indoor air from flowing into the indoor unit 100 from the outlet 3, and is sucked into the indoor unit 100. The air does not flow out.
The once-through fan 12 rotates clockwise (in the direction of arrow α2 in FIG. 2). The length of the rotation axis of the once-through fan 12 in the longitudinal direction is defined by the two left and right side walls 23, and the ventilation passage is formed by the two left and right side walls.

As shown in FIG. 4, the front nose 16 is configured to have a curved surface shape facing the once-through fan 12. The front nose 16 has extension portions 19 at both ends of the once-through fan 12 in the axial direction, which are longer in the circumferential direction than the central portion. Then, in the vicinity of both ends in the axial direction of the once-through fan 12, the extension portion 19 extends so as to narrow the outlet 3. The extension portion 19 is formed so that the end side 19b is longer on the rear side than the central portion side 19a. Although the left side of the indoor unit 100 (see FIG. 1) is taken as an example in FIG. 4, the right side is also formed in a symmetrical shape.

Due to the aged use of the pre-filter 5, when dust clogs the pre-filter 5, the ventilation resistance increases and the air flow becomes unstable. Therefore, indoor air may flow in from the air outlet 3 of the indoor unit 100.

Further, in the vicinity of the side walls 23 at both ends of the once-through fan 12 in the axial direction, the ventilation resistance is larger due to the influence of the frictional resistance of the side wall surface 23p of the indoor unit 100 as compared with the central part. Due to this ventilation resistance, it is not possible to generate a large static pressure difference between the vicinity of the front nose 16 and the air outlet 3. Therefore, it is generally known that the blowing air speed from the outlet 3 becomes slow and the blowing air tends to become unstable.

Therefore, like the main indoor unit 100, the front nose 16 is configured to have extension portions 19 formed so that the end side 19b is formed longer on the rear side than the central side 19a at both ends near both side walls 23. To. As a result, a large static pressure difference is generated between the vicinity of the front nose 16 and the outlet 3.

By providing the extension portion 19 on the front nose 16, the flow of the circulating vortex U (see FIG. 2) can be stabilized, the wind speed of the conditioned air discharged from the outlet 3 can be increased, and the blowing can be stabilized. In addition, by providing extension portions 19 of the front nose 16 near both ends near both side walls 23 in the axial direction of the once-through fan 12, it is stable while suppressing deterioration of the input of the once-through fan 12 due to a decrease in the opening area as much as possible. And the harmonious air can be blown.

During the cooling operation, the temperature of the extension 19 of the front nose 16 is lowered by the air cooled through the heat exchangers (10, 11). In this way, the surface 19q of the extension portion 19 facing the once-through fan 12 is cooled. In particular, since the wall thickness of the extension portion 19 is thin and heat conduction is easy, the stagnant air in the vicinity of the surface 19p on the opposite side of the surface 19q facing the once-through fan 12 of the extension portion 19 is cooled by the extension portion 19 and is below the dew point. Dew point may occur on the surface 19p opposite the surface 19q facing the once-through fan 12. The water droplets may be blown into the room by blowing air.

Therefore, in the indoor unit 100, as shown in FIGS. 3A and 4, the surface 19p on the opposite side of the surface 19q facing the once-through fan 12 of the extension portion 19 of the front nose 16 constituting the stabilizer 18 is used. It has a plurality of groove portions 20 extending in the airflow direction of the once-through fan 12 so as to repeat the concave portion 20o and the convex portion 20t in the axial direction of the once-through fan 12. The plurality of grooves 20 are formed in a fine structure so that water droplets can be held inside the recess 20o by surface tension.

Water droplets condensing on the surface 19p opposite to the surface 19q facing the once-through fan 12 of the extension portion 19 adhere to the recess 20o constituting the groove 20, and the adhered water droplet 21 adheres to the bottom surface of the recess 20o and both wall surfaces of the side wall. It is held by the surface tension it receives. In addition, since the condensed water droplets are located in the recesses 20o forming the groove 20, the wind does not enter and is not easily affected by the air blow. Therefore, it is possible to prevent water droplets from being blown into the room. On the other hand, the water droplet 22 that does not adhere to the recess 20o constituting the groove 20 has a weak holding force because the wall surface that receives surface tension is only the bottom surface.

Further, when the extension portion 19 of the resin front nose 16 is molded, as shown in FIG. 4, the root portion 19n has a thick shape and the tip portion 19s has a thin shape. Therefore, the cooling shrinkage of the resin after molding tends to cause distortion due to a large root portion 19n and a small tip portion 19s after molding, or to deviate from a predetermined dimension.

Therefore, the thickness of the front nose 16 is made uniform by providing the groove portion 20 near the root portion 19n of the extension portion 19 of the front nose 16 which is a resin material. By making the thickness uniform, it becomes possible to uniformly cool the extension portion 19 when molding the mold, and it is possible to suppress strain. Therefore, there is an advantage that the extension portion 19 of the front nose 16 can be molded to a predetermined size.

FIG. 5 is a bottom view of the front nose 16 viewed from the outlet 3 side in the vicinity of the I-I cross section of FIG. 1 at one end of the once-through fan 12 in the axial direction.
By providing a plurality of groove portions 20 along the rotation direction of the once-through fan 12 in the extension portion 19 of the front nose 16, water droplets 21 (see FIG. 4) adhering to the recess 20o constituting the groove portion 20 can be discharged from the wall surface of the recess 20o. The area that receives the surface tension of is increased, and more water droplets can be retained. Further, it is preferable that the relationship between the axial length A of the once-through fan 12 of the groove 20 and the axial distance B of the once-through fan 12 between the grooves 20 is 0.3 <A / B <3.0.

If the axial length A of the once-through fan 12 of the groove 20 is larger than 3.0, the water droplet 21 adhering to the recess 20o forming the groove 20 cannot contact the wall surface forming the recess 20o, and sufficient surface tension is obtained. Can't get. On the other hand, if the axial length A of the once-through fan 12 of the groove 20 is too smaller than 0.3, a sufficient volume for holding the water droplet 21 cannot be secured, and it becomes difficult to hold the water droplet 21 in the groove 20. ..

By setting the relationship between the axial length A of the once-through fan 12 of the groove 20 and the axial distance B of the once-through fan 12 between the grooves 20 to be 0.3 <A / B <3.0, the water droplet 21 forms the recess 20o of the groove 20. It can come into contact with the constituent wall surface, and sufficient surface tension can be obtained. In addition, a sufficient volume can be secured to hold the water droplet 21, and the water droplet 21 can be reliably held.

In the present embodiment, as shown in FIG. 3A, a case where the groove portion 20 is provided so as to repeat the concave portion 20o and the convex portion 20t in the axial direction of the once-through fan 12 has been described, but FIG. 3B shows. As shown, the same effect can be obtained by providing the groove portion 20 so as to repeat the concave portion 20o and the convex portion 20t in the radial direction of the once-through fan 12, that is, in the direction perpendicular to the axis of the once-through fan 12. That is, even when the concave portion 20o and the convex portion 20t extending along the axial direction of the once-through fan 12 are repeatedly formed as the groove portion 20, water droplets with dew can be retained in the groove portion 20.

<Test of water droplet retention effect of groove 20>
FIG. 6 shows a result of comparing the amount of water droplets retained on the extension portion 19 depending on the presence or absence of the groove portion 20 when dew condensation occurs on the surface 19p opposite to the surface 19q facing the once-through fan 12 of the extension portion 19 of the front nose 16. Is shown. The left side of FIG. 6 is the case of “without groove”, and the right side of FIG. 6 is the case of “with groove”. The vertical axis of FIG. 6 shows the amount of water droplets retained by the once-through fan 12 before blowing air (shown by a broken line), whereas the amount of water droplets held by the once-through fan 12 after blowing air (shown by a solid line).

The test was conducted as follows. Create a test piece having the same shape as the extension 19 of the front nose 16 and place it on the back side of the test piece (corresponding to the surface 19p opposite the surface 19q facing the once-through fan 12) under high humidity conditions close to the dew point. Will cause condensation. After that, air was blown for a certain period of time, and the amount of water droplets retained before and after the air was blown. FIG. 6 shows the amount of water droplets retained after blowing as a ratio to the amount of water droplets retained before blowing. In this test, when the amount of water droplets retained after blowing air is small, it indicates that the amount of dew splash is large.

As can be seen from the test, the grooved test piece (right side of FIG. 6) holds about 60% of water droplets, and the ungrooved test piece (left side of FIG. 6) holds about 40% of water droplets. It was a result. From this result, it was confirmed that the groove portion 20 retains water droplets because the amount of water droplets retained after blowing air is larger when the groove is provided.
The extension 19 may have a hue similar to that of the front casing 14 of a black or dew dish so as not to be noticeable. Of course, the extension portion 19 may use a hue other than this.

From the above, according to the configuration of the first embodiment, by providing the groove portion 20 in the extension portion 19 of the front nose 16, water droplets adhering to the extension portion 19 of the front nose 16 can be held in the recess 20o of the groove portion 20. By holding the water droplets, it is possible to prevent the dew condensation water droplets from scattering into the air-conditioned space.

Since the groove portion 20 is formed in a shape in which a plurality of concave portions 20o and convex portions 20t are repeated, water droplets of dew condensation can be retained by surface tension. Further, since the extending direction of the concave portion 20o or the convex portion 20t forming the groove portion 20 is formed along the flow direction of the air flow of the once-through fan 12, water droplets enter the groove portion 20 and leak from the groove portion 20. Can be suppressed.

Therefore, when water droplets adhere to the surface 19p opposite to the surface 19q facing the once-through fan 12 of the stabilizer 18 due to dew condensation, it is possible to prevent the water droplets from being blown into the room by blowing air, and highly reliable ventilation is possible. Air conditioner C can be realized. That is, it is possible to provide the indoor unit 100 of the air conditioner C in which the reliability of the effect of suppressing the scattering of water droplets is guaranteed.

<Example>
FIG. 7 is a view of the extension portion 29 of the front nose 26 of the embodiment of the first embodiment as viewed in the axial direction of the once-through fan 12.
In the embodiment, in order to prevent dew from accumulating on the tip 29s of the extension 29 of the front nose 26 extended in the direction toward the back casing 15, the extension 29 of the tip of the front nose 26 is angled upward from the horizontal. Is formed in. A groove 20 is provided on the surface 29p opposite the surface of the extension 29 facing the once-through fan 12.

As a result, the water droplets of dew condensation adhering to the surface 29p opposite to the surface facing the once-through fan 12 of the extension portion 29 easily enter the groove portion 20, and move from the tip portion 29s of the extension portion 29 to the root portion 29n by gravity. Be retained. After that, the water droplets in the groove 20 evaporate. Therefore, it is possible to more effectively prevent water droplets with dew from being blown off by the wind force of the once-through fan 12 and scattered into the room of the air-conditioned space.

FIG. 8 is a view of the extension portion 119 of the front nose 116 of Comparative Example 1 as viewed in the axial direction of the once-through fan 12.
Since the extension portion 119 of the front nose 116 of Comparative Example 1 faces downward from the horizontal, dew condensation water droplets 122 collect on the tip portion 119s, and dew splashing is likely to occur.

On the other hand, since the extension portion 29 of the tip of the front nose 26 of the embodiment shown in FIG. 7 has an angle upward from the horizontal, the water droplet 21 with dew enters the groove portion 20 and the root portion 29n. It can be moved to and retained, and then evaporated to suppress the occurrence of dew splatter.

<< Embodiment 2 >>
FIG. 9 shows an obliquely lower side of the vicinity of the outlet 3 of the front nose 16 in the I-I cross section of FIG. 1 at both ends in the axial direction of the once-through fan 12 of the indoor unit 100 of the air conditioner according to the second embodiment of the present invention. It is a perspective view seen from.
Hereinafter, only the configuration and action / effect of the portion different from the first embodiment will be described.

In the second embodiment, the front nose 36 is not provided with an extension portion, and the groove portion 30 is provided on the surface 38p of the front casing 34 constituting the stabilizer 38 opposite to the surface facing the once-through fan 12.
In the stabilizer 38 of the second embodiment, the extension portion of the front nose 36 is not formed, and the front nose 36 is formed in a uniform shape in the axial direction of the once-through fan 12. A groove portion 30 having a shape in which irregularities are repeated in the axial direction of the once-through fan 12 is provided on the surface 38p of the front casing 34 constituting the stabilizer 38 on the opposite side of the surface facing the once-through fan 12.

When the extension portion of the front nose 36 is not formed as in the second embodiment, the opening area near both ends of the once-through fan 12 in the axial direction is increased as compared with the first embodiment, and the flow velocity can be reduced. Therefore, it can contribute to the reduction of the fan input of the once-through fan 12 especially under the operating conditions with a large flow rate.
Further, a groove portion 30 having a shape that repeats the concave portion 30o and the convex portion 30t is provided in the axial direction of the once-through fan 12. As a result, even if dew condensation occurs on the surface 38p of the once-through fan 12 of the stabilizer 38 in the entire axial direction, the water droplet 31 can be held in the groove 30 and the water droplet 31 can be prevented from being blown into the room of the air conditioning space. ..

If a large amount of dew condensation occurs at both ends of the axial surface 38p of the once-through fan 12 in the stabilizer 38, the volume of the recesses 30o constituting the groove 30 near both ends may be increased or the number of recesses 30o may be increased. By increasing the length of 30o, the structure will be increased so that a large amount of dew condensation water droplets 31 can be retained. That is, on the surface 38p of the stabilizer 38, the volume of the recess 30o forming the groove 30 near both ends is made larger than the volume of the recess 30o forming the groove 30 in the central portion. The volume may be distributed or changed.

By distributing or changing the volume of the recess 30o constituting the groove 30, it is sufficient to hold water droplets near both ends of the once-through fan 12 in the axial direction where the air flow tends to be unstable and dew condensation is likely to occur. Can secure a large volume. On the other hand, in a place near the center where dew condensation is unlikely to occur, the volume of the recess 30o is reduced by reducing the number of recesses 30o constituting the groove 30 or shortening the length of the recess 30o, which affects the flow field of conditioned air. It is possible to secure a volume for holding water droplets while minimizing the amount of water droplets.

Based on the above, according to the configuration of the second embodiment, the groove portion 30 is provided on the surface 38p opposite to the surface of the front casing 34 constituting the stabilizer 38 facing the once-through fan 12. As a result, when dew condensation occurs on the surface 38p of the stabilizer 38, water droplets can be retained in the recesses 30o constituting the groove portion 30 and the water droplets can be suppressed from being blown into the room of the air conditioning space. Therefore, it is possible to provide the indoor unit 100 of the air conditioner in which the reliability of the effect of suppressing the scattering of water droplets into the air conditioning space is guaranteed.

<< Embodiment 3 >>
FIG. 10 (a) is a perspective view of the indoor unit 100 of the air conditioner according to the third embodiment of the present invention, including a cross section II-II of FIG. 1, and FIG. 10 (b) is a perspective view of the air conditioner. FIG. 5 is a schematic view of the surface 48p on the opposite side of the surface facing the once-through fan 12 of the stabilizer 38 of the third embodiment as viewed from the front.

In the indoor unit 100 of the air conditioner of the third embodiment, the distance between the surface 48p on the opposite side of the surface of the stabilizer 48 facing the once-through fan 12 and the back casing 15 is on the side along the axial direction of the once-through fan 12. It has a structure that becomes narrower as it approaches the wall surface 23p.

In this configuration, the horizontal distance between the surface 48p of the stabilizer 48 and the back casing 15 becomes narrower as it approaches the side wall surface 23p along the fan axial direction of the once-through fan 12. That is, if the horizontal distance L2 between the central side surface 48p1 near the center and the back casing 15 and the horizontal distance L1 between the surface 48p2 near the end and the back casing 15, there is a relationship of L1 <L2. ..

According to this, since the wind speed of the stabilizer 48 becomes lower as it approaches the side wall surface 23p, it is difficult for water droplets with dew to fly even if the horizontal interval L1 is narrowed. On the other hand, the stabilizer 48 has a higher wind speed as it approaches the central side surface 48p1 near the center, so the horizontal interval L2 is lengthened, so it is difficult for water droplets with dew to fly.

Alternatively, as shown in FIG. 10B, the central side surface 48p1 of the surface 48 opposite the surface of the stabilizer 48 facing the once-through fan 12 is located above the end side surface 48p2.
According to this, the dew 24 adhering to the surface 48p of the stabilizer 48 is transmitted in the direction of the side wall surface 23p by gravity and adheres to the side wall surface 23p or its vicinity. Since the wind speed is low near the side wall surface 23p, dew dripping and dew flying can be suppressed.

<< Other Embodiments >>
1. 1. A water-retaining sheet on which fine hairs are formed may be attached to the front side of the grooves (20, 30) of the first to third embodiments. According to this, the water droplets held in the grooves (20, 30) can be more reliably held by the water retention sheet.

2. The extension portions (19, 29) described in the first to third embodiments may be formed of another piece or a member shared with other members instead of being formed on the front nose (16, 26).

3. 3. The air conditioner according to the present invention has been described in detail by showing embodiments. Needless to say, the content of the present invention is not limited to the embodiment, and can be appropriately modified or changed within a range not deviating from the gist thereof.

12 once-through fan
13 Fan blade (fan element)
14 Front casing
15 Back casing
16 Front nose
18, 28, 38, 48 stabilizer
19, 29 Extension
19p, 29p, 48P The surface opposite the surface facing the once-through fan
19q Surface facing the once-through fan
20, 30 grooves
20o, 30o recess
20t, 30t convex part
48p1 Central side surface (central part)
48p2 End side (end)
100 indoor unit
A-axis length
B-axis distance
C air conditioner

Claims (4)

A once-through fan configured by connecting multiple fan elements in the axial direction,
A stabilizer arranged below the once-through fan along the axial direction,
The indoor unit is provided with a back casing that covers the once-through fan from behind.
A groove is provided on the surface of the stabilizer opposite to the surface facing the once-through fan .
The stabilizer has an extension portion formed by extending along the circumferential direction of the once-through fan in the vicinity of the side wall surface of the indoor unit.
An air conditioner characterized in that the groove portion is formed in the extension portion . A once-through fan configured by connecting multiple fan elements in the axial direction,
A stabilizer arranged below the once-through fan along the axial direction,
The indoor unit is provided with a back casing that covers the once-through fan from behind.
A groove is provided on the surface of the stabilizer opposite to the surface facing the once-through fan .
The stabilizer has an extension portion formed by extending along the circumferential direction of the once-through fan in the vicinity of the side wall surface of the indoor unit.
The extension is
An air conditioner characterized in that it is formed with an inclination upward from the horizontal direction and the groove portion is formed . A once-through fan configured by connecting multiple fan elements in the axial direction,
A stabilizer arranged below the once-through fan along the axial direction,
The indoor unit is provided with a back casing that covers the once-through fan from behind.
A groove is provided on the surface of the stabilizer opposite to the surface facing the once-through fan .
An air conditioner characterized in that the groove portion is formed so as to extend along the axial direction of the once-through fan . A once-through fan configured by connecting multiple fan elements in the axial direction,
A stabilizer arranged below the once-through fan along the axial direction,
The indoor unit is provided with a back casing that covers the once-through fan from behind.
An air conditioner characterized in that a surface of the stabilizer opposite to a surface facing the once-through fan is formed so that a central portion thereof is formed higher than an end portion along the axial direction of the once-through fan.