JP2018179384A - Indoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dew condensation on a wind direction plate and a decorative panel without degrading air supplying performance, in an indoor unit of an air conditioner sucking the indoor air through a centrifugal blower disposed in a housing, cooling or heating the air through a heat exchanger disposed at a discharge side of the centrifugal blower, and blowing out the air toward a room.SOLUTION: An indoor unit of a ceiling-embedded air conditioner, includes a housing configuring a top face and a side face of the indoor unit, a centrifugal blower sucking the indoor air from a lower part, and discharging the air to a side part, a heat exchanger surrounding a side part of the centrifugal blower and composed of a straight portion and a bent portion, a drain pan disposed at a lower part of the heat exchanger and receiving dew condensation water, a blowout port formed between an outer wall surface of the drain pan and a side face of the housing, and a partitioning plate disposed toward a substantially transverse direction of the blowout port, near a longitudinal end portion of the blowout port. A prescribed clearance is formed between an upper end of the partitioning plate and a top face of the housing, and a lower end of the partitioning plate is positioned at a lower part with respect to an upper end of the outer wall surface of the drain pan.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indoor unit of an air conditioner, and in particular, sucks air from a room via a centrifugal fan provided in a housing, and cools the air via a heat exchanger provided on the blowout side of the centrifugal fan. Alternatively, the invention relates to a ceiling embedded cassette type indoor unit that blows toward the room after heating.

  In a general air conditioner, a compressor that compresses a refrigerant, an indoor heat exchanger that exchanges heat between the refrigerant and room air, an expansion valve that decompresses the refrigerant, and a refrigerant in a refrigerant circulation flow path in which the refrigerant is enclosed. And a refrigeration cycle in which outdoor heat exchangers for exchanging heat with the outside air are sequentially disposed. Among them, the outdoor heat exchanger is housed in the casing of the outdoor unit together with the blower for sending air to the outdoor heat exchanger, and the indoor heat exchanger is provided in the casing of the indoor unit together with the blower for sending indoor air to the indoor heat exchanger. Stored in

  There are various types of indoor units corresponding to the installation place, but in recent years, especially in the field for business use, the housing is embedded in the ceiling and the air is made through the decorative panel installed on the ceiling surface So-called ceiling-embedded cassette type, which sucks and blows out, has become mainstream.

  An example of a conventional ceiling embedded cassette type indoor unit 100 will be described with reference to FIGS. 11 to 14. FIG. 10 is a cross-sectional view of a conventional indoor unit 100. As shown here, the indoor unit 100 includes a decorative panel 1 and a housing 2 connected to the decorative panel 1.

  Here, the decorative panel 1 is provided with a suction grill 3 at the center, and an outlet 5 provided with a wind direction plate 4 around the periphery thereof. The suction grille 3 is attachable to and detachable from the decorative panel 1 together with the filter 16, so that the filter 16 can be easily cleaned.

  In the housing 2, a centrifugal fan 19 comprising a motor 6 and a centrifugal fan 7 connected to the shaft thereof is installed, and the centrifugal fan 7 is rotated by operating the motor 6, as shown by the arrow 15, The room air is drawn into the suction port of the centrifugal fan 7 through the suction grill 3, the filter 16, and the bell mouth 10 and is discharged from the discharge port of the centrifugal fan 7 as indicated by the arrow 18. Further, the indoor heat exchanger 8 is disposed so as to surround the periphery of the centrifugal fan 19, and the air discharged from the centrifugal fan 7 is heat-exchanged by the indoor heat exchanger 8, and then, as shown by the arrow 117, The outside passes through the blowout channel 20 formed by the inner surface of the housing 2 and is blown out into the room from the blowout port 5.

  Further, a drain pan 9 for receiving condensed water generated in the indoor heat exchanger 8 at the time of cooling is installed at the lower part of the indoor heat exchanger 8. On the lower surface of the bell mouth 10, there is installed an electric item box 11 containing a control board (not shown) for controlling the operation of the indoor unit 100. By opening the suction grille 3, maintenance of the electric item box 11 is facilitated. Is a possible structure. The bell mouth 10 is attached to the inner periphery of the drain pan 9 from below, and maintenance such as replacement of the centrifugal fan 7 and the motor 6 can be easily performed by opening the suction grill 3 and removing the bell mouth 10 There is.

  Next, a cross section perpendicular to the rotation axis of the centrifugal fan 7 indicated by the alternate long and short dash line in FIG. 11 will be described using FIG. 12. This figure is a cross-sectional view of the cross section passing through the discharge port of the centrifugal fan 7 as viewed from above. As shown here, the heat exchanger 8 is composed of a straight portion and a bent portion so as to surround the centrifugal fan 7. Further, a drain pump 21 for discharging the condensation water accumulated in the drain pan 9 to the outside of the indoor unit 100 is disposed at one corner (upper left in FIG. 12), and the heat exchanger 8 avoids the drain pump 21. As it is folded inwards. Further, at another corner (upper right in FIG. 12), a machine room 22 for accommodating piping and accessories connected to the heat exchanger 8 is disposed. The broken line 23 is a projection of the blowout port 5, and indicates that the blowout ports 5 are disposed on the four sides of the indoor unit 100 and not provided at the corner. In addition, in this figure, description is abbreviate | omitted about piping, accessories, etc. which do not need description for understanding of this invention.

  When the centrifugal fan 7 rotates clockwise as indicated by the arrow 30, air is blown out at an angle inclined from the radial direction of the centrifugal fan 7 to the rotational direction as indicated by the arrow 18, and after passing through the heat exchanger 8. , Will go to the outlet 5. Here, the air that has passed through the straight portion of the heat exchanger 8 facing the opening of the outlet 5 is directly blown out from the outlet 5 as shown by the arrow 117 a, but is blown out from around the bent portion of the heat exchanger 8. The air to be blown is blown out from the end side of the blowout port 5 as indicated by the arrow 117 b.

  Next, with reference to FIG. 13, a cross section passing through the blowout port 5 indicated by an alternate long and short dash line in FIG. 12 will be described. This figure is a cross-sectional view of a cross section parallel to the longitudinal direction of the blowout port 5 as viewed from the outside direction of the indoor unit 100. As shown here, of the air of arrow 117 b blown out from the periphery of the bent portion of heat exchanger 8, the air blown out of the lower portion of heat exchanger 8 temporarily makes the wall surface of drain pan 9 as shown by arrow 117 c. After overcoming, it flows into the outlet 5. At this time, the air of the arrow 117c which passes over the wall surface of the drain pan 9 can not be bent along the wall surface, and as a result, a stagnant area 130 where almost no air flows is generated at the end of the outlet.

  Next, with reference to FIG. 14, a cross section in the vicinity of the end portion of the outlet 5 indicated by an alternate long and short dash line in FIG. 13 will be described. This figure is a cross section vertically cut near the end of the outlet 5. Since the air passing above the heat exchanger 8 is suddenly bent downward from the horizontal direction, the flow tends to be biased to the outside of the housing 2. In the central portion of the outlet 5, the amount of air of the arrow 117a blown out from the heat exchanger 8 is large enough, so the air flows through the entire width of the outlet 5, but near the end of the outlet 5 shown in FIG. Since the stagnant area 130 is generated as described above, the air is concentrated on the outside where it can flow easily, as shown by the arrow 117 d, and a stagnant area 131 in which almost no air flows on the back side of the wind direction plate 4 is generated. As described above, when stagnant areas 130 and 131 are generated at the outlet of the outlet 5, warm and damp indoor air outside the indoor unit 100 is wound around the outlet 5, and dew is formed on the wind direction plate 4 and the decorative panel 1 near the outlet 5. There was a problem of becoming easy to occur.

  In order to solve such a problem, in Patent Document 1, the flow passage is partitioned along the short side of the air outlet on the outer peripheral side of the heat exchanger at the position indicated by reference numeral 31 in FIG. 1 and FIG. A partition plate is provided to increase the flow rate of air flowing around the outlet end.

JP, 2015-158318, A

  However, as in Patent Document 1, when the partition plate is provided all over from the upper part to the lower part of the air conditioning air blowout flow path, all the air that has passed through the corner of the heat exchanger has a narrow opening at the outlet end. There is a problem that the air flow performance is deteriorated such that the pressure loss is increased and the air volume is decreased.

  The problem to be solved by the present invention is that after suctioning air from the room via a centrifugal fan provided in the housing and cooling or heating the air via a heat exchanger provided on the discharge side of the centrifugal fan In an indoor unit of an air conditioner that blows out toward the room, an indoor unit of air conditioned air that prevents the occurrence of a stagnant area near the end of the outlet without deteriorating the blowing performance, and suppresses condensation near the outlet. It is to get.

  In order to achieve the above object, an indoor unit of an air conditioner according to the present invention is an indoor unit of an air conditioner embedded in a ceiling, comprising: a case constituting an upper surface and a side surface of the indoor unit; A centrifugal fan which sucks in from the lower side and discharges it to the side, a heat exchanger composed of a straight portion and a bent portion surrounding the side of the centrifugal fan, and a drain pan provided below the heat exchanger to receive condensation water. An outlet provided between an outer wall surface of the drain pan and a side surface of the housing, and a partition plate provided in the vicinity of a longitudinal end of the outlet with the substantially short direction of the outlet facing the outlet. And a predetermined gap is provided between the upper end of the partition plate and the upper surface of the housing, and the lower end of the partition plate is positioned lower than the upper end of the outer wall surface of the drain pan.

  According to the present invention, it is possible to obtain an indoor unit of air-conditioned air that prevents the generation of the stagnant area near the end of the air outlet without deteriorating the air blowing performance, and suppresses condensation near the air outlet.

FIG. 2 is a cross-sectional view showing the indoor unit of the air conditioner of the first embodiment. Sectional drawing perpendicular | vertical to the rotating shaft of the indoor unit of Example 1. FIG. FIG. 2 is a cross-sectional view through the outlet of the indoor unit of the first embodiment. FIG. 2 is a cross-sectional view of the vicinity of the outlet end of the indoor unit of the first embodiment. The graph which shows the relationship between the magnitude | size of the clearance gap between the top plate of Example 1, and a partition plate, and fan power. Sectional drawing perpendicular | vertical to the rotating shaft of the indoor unit of the air conditioner of Example 2. FIG. Sectional drawing which passes along the blower outlet of the indoor unit of the air conditioner of Example 3. FIG. Sectional drawing of the blower outlet end vicinity of the indoor unit of the air conditioner of Example 3. FIG. FIG. 16 is a cross-sectional view of the indoor unit of the air conditioner according to the fourth embodiment near the outlet end portion thereof. Sectional drawing of air outlet end vicinity vicinity of the indoor unit of the air conditioner of Example 5. FIG. Sectional drawing which shows an example of the indoor unit of the conventional air conditioner. Sectional drawing perpendicular | vertical to the rotating shaft of the conventional indoor unit. Sectional drawing through the blower outlet of the conventional indoor unit. Sectional drawing of the blower outlet end vicinity of the conventional indoor unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The indoor unit 100 of the air conditioner according to the first embodiment will be described with reference to FIGS. 1 to 5. In addition, duplication description is abbreviate | omitted about the structure equivalent to FIGS. 11-14.

  FIG. 1 is a cross-sectional view showing the indoor unit 100 of the air conditioner of the first embodiment. In the present embodiment, unlike in FIG. 11 and the like, a substantially rectangular partition plate 41 for partitioning the outlet flow passage 20 is provided in the vicinity of the longitudinal end of the outlet 5 with the substantially short direction of the outlet 5 facing. ing. The outer edge of the partition plate 41 is in contact with the inner surface of the housing 2, and the lower portion of the inner edge bites into the outer wall surface of the drain pan 9. Further, the upper end of the partition plate 41 is separated from the top plate of the housing 2 by a predetermined distance so that air can pass through the gap between the ceiling formed in the upper part of the blowout flow passage 20 and the partition plate 41 ing. On the other hand, the lower end of the partition plate 41 is configured to be located below the upper end of the outer wall surface of the drain pan 9.

  Next, with reference to FIG. 2, a cross section perpendicular to the rotation axis of the centrifugal fan 7, which is indicated by an alternate long and short dash line in FIG. 1, will be described. This figure is a view of a cross section passing through the discharge port of the centrifugal fan 7 as viewed from the top plate side of the housing 2. When the centrifugal fan 7 rotates clockwise as indicated by the arrow 30, air is blown out at an angle inclined from the radial direction of the centrifugal fan 7 to the rotational direction as indicated by the arrow 18, and after passing through the heat exchanger 8. , Will go to the outlet 5. Here, the air that has passed through the straight portion of the heat exchanger 8 facing the opening of the outlet 5 is blown out directly from the outlet 5 without colliding with the partition plate 41 as shown by the arrow 17 a. On the other hand, the air blown out from around the bent portion of the heat exchanger 8 is directed to the end side of the outlet 5 along the path of the arrow 17 b 1. Then, it collides with the partition plate 41, and is separated into the flow toward the inside of the housing 2 and the flow toward the outside as shown by the arrow 17e.

  Next, with reference to FIG. 3, a cross section passing through the blowout port 5 indicated by an alternate long and short dash line in FIG. 2 will be described. This figure is a cross-sectional view of a cross section parallel to the longitudinal direction of the blowout port 5 as viewed from the outside direction of the indoor unit 100. The air blown out from the lower part around the bent portion of the heat exchanger 8 once passes over the outer wall surface of the drain pan 9 as shown by the arrow 17c and then collides with the partition plate 41 to change the flow downward. It flows into the outlet 5. For this reason, the flow of air along the outer wall surface of the drain pan 9 can be created, and the generation of the stagnant area 130 shown in FIG. 13 can be suppressed.

  On the other hand, the air blown out from the upper part of the heat exchanger 8 passes directly through the gap between the ceiling and the partition plate 41 as shown by the arrow 17 b 2 and directly goes to the outlet as in FIG. 13 without the partition plate 41. be able to. Therefore, with regard to the air blown out from the upper part of the heat exchanger 8, even when the partition plate 41 is disposed, there is no deterioration in the resistance at the outlet 5, and the air blowing performance as the indoor unit 100 is deteriorated. Absent.

Next, with reference to FIG. 4, a cross section in the vicinity of an end portion of the blowout port 5 indicated by an alternate long and short dash line in FIG. 3 will be described. This figure is a cross section vertically cut near the end of the outlet 5, H _{1 in} the figure is the distance from the ceiling of the housing 2 to the upper end of the outer peripheral part of the drain pan 9, H ₂ is The distance from the ceiling of the housing 2 to the upper end of the partition plate 41. Since the air passing above the heat exchanger 8 is suddenly bent downward from the horizontal direction, the flow tends to be biased to the outside of the housing 2, but in the present embodiment, the flow is biased as shown in FIG. As a part of the air that has collided with the partition plate as shown by the arrow 17 e becomes the flow of the arrow 17 f directed to the inside of the housing 2, and this will blow out from the inside direction of the housing 2 of the air outlet 5. The stagnant area 131 as shown in FIG. 14 does not occur in the vicinity of the end portion of the wind direction nor on the back side of the wind direction plate 4. Therefore, as compared with the conventional air conditioner shown in FIGS. 11 to 14, it is possible to suppress the warm and damp indoor air from being caught in the air outlet 5, and the air conditioning in which condensation does not easily occur in the wind direction plate 4 and the decorative panel 1. You can get a machine.

Next, the relationship between the size of the gap between the housing 2 and the partition plate 41 and the size of the driving force of the centrifugal blower 19 in the present embodiment will be described using the graph of FIG. 5. In this graph, the horizontal axis is the ratio of H ₂ and H ₁ shown in FIG. 4, the vertical axis illustrates relative sizes of the air mobility required for a discharge of a predetermined air volume. As is apparent from this graph, the power of the blower necessary to obtain a predetermined air volume, the clearance (H ₂₎ is large when less than 20%, the gap (H ₂₎ when the 20% strength to about 80% In particular, it can be seen that the clearance (H ₂ ) is at a minimum when the gap (H ₂ ) is about 50%. Accordingly, the height of the partition plate 41 provided on the end portion of the air outlet 5, by 20 to 80% relative to H _1, while suppressing the driving force of the centrifugal blower 19, suppressing the occurrence of stagnation zone Condensation of the wind direction plate 4 and the decorative panel 1 can be avoided.

  In order to obtain a sufficient effect of flowing the air to the back side of the wind direction plate, it is preferable to provide the inner end up to a position where it substantially contacts the drain pan. Further, the closer the inner end approaches the heat exchanger, the higher the effect of causing the flow to flow to the back side of the wind direction plate, and may be provided at a position where it contacts the heat exchanger.

  In addition, if the partition plate is integrally formed of the same material as the drain pan, the number of parts is not increased, the trouble of attaching another part can be saved, and the manufacturing cost can be reduced.

  A second embodiment will now be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part with an equal structure to Example 1, and duplication description is abbreviate | omitted.

  FIG. 6 is a cross-sectional view perpendicular to the rotation axis of the centrifugal fan 7 of the air conditioner of the present embodiment, and is a cross-sectional view corresponding to FIG. 2 of the first embodiment. The difference from the first embodiment is that the distance between the partition plate 42 and the end of the outlet 5 is smaller on the inner side than the outside of the housing 2 in the horizontal section when the partition 42 provided near the end of the outlet 5 is horizontal. It is becoming. In the present embodiment, in addition to the effects of the first embodiment, the flow velocity inside the casing in the vicinity of the end portion of the outlet, which is a region where a stagnation zone tends to occur, is narrowed to increase the wind speed and make stagnation difficult. Furthermore, condensation can be made less likely to occur on the wind direction plate and the air outlet.

  A third embodiment will now be described with reference to FIGS. 7 and 8. In addition, the same code | symbol is attached | subjected to the part with an equal structure to the above-mentioned Example, and duplication description is abbreviate | omitted.

  FIG. 7 is a cross section passing through the air outlet 5 of the air conditioner according to the present embodiment, and FIG. 8 is a cross section near the end of the air outlet 5 of the air conditioner according to the present embodiment. 5 is a cross-sectional view corresponding to FIG.

  The present embodiment is different from the above-described embodiment in that the partition plate 43 is provided with a substantially horizontal slit 43 a extending in the substantially short direction of the blowout port 5. The air blown out from the upper portion of the bent portion of the heat exchanger 8 is directed directly to the air outlet as in the case of no partition plate as shown by the arrow 17b2 in FIG. There is a risk of flow separation and stagnation zones at the central surface of the Therefore, in the partition plate 43 of the present embodiment, a part of the air from the corner of the heat exchanger 8 toward the blowout port 5 is allowed to flow to the surface on the center side of the partition plate 43 through the slit 43a as shown by arrow 17h. It is possible to prevent the separation of air and to prevent the formation of stagnant zones. The slits 43a may be provided across the entire width of the partition plate 43, and the partition plate 43 may be separated into upper and lower portions. However, as shown in FIG. It can be configured as a part without deteriorating the assembling performance.

  A fourth embodiment will now be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part with an equal structure to the above-mentioned Example, and duplication description is abbreviate | omitted.

  FIG. 9 is a cross-sectional view in the vicinity of the end of the air outlet 5 of the air conditioner in the present embodiment, and is a cross-sectional view corresponding to FIG. 4 in the first embodiment. The difference from the above embodiment is that a recess is formed from the lower part of the outer wall surface of the drain pan 29 to the outlet of the outlet 5 so that the inner wall of the outlet 5 (that is, the outer wall surface of the drain pan 29) is recessed inward. The lower end of 44 is projected so as to be located in the recess of the inner wall. The air passing through the lower part of the heat exchanger 8 is easily separated at the upper end of the outer wall of the drain pan, but the outer wall of the drain pan 29 is thickened to promote reattachment of the separated air. It is possible to increase the air passing through. In particular, in the present embodiment, the partition plate 44 is extended to a recess where the thickness of the outer wall surface of the drain pan 29 is reduced, air is prevented from flowing to the center in the recess, and condensation is more effectively performed. Can be prevented.

  A fifth embodiment will now be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part with an equal structure to the above-mentioned Example, and duplication description is abbreviate | omitted.

  FIG. 10 is a cross section near the end of the outlet 5 of the air conditioner in the present embodiment, and is a cross sectional view corresponding to FIG. 4 in the first embodiment. The difference from the fourth embodiment is that the partition plate 45 is extended into the air outlet of the decorative panel, and further, a groove is provided in a range where the wind direction plate 4 moves so as not to interfere with the wind direction plate 4 That is the point. By extending the partition plate 45 to the wind direction plate 4 in this manner, it is possible to make the wind direction plate 4 less likely to cause condensation. Here, the partition plate 45 may be integral, or the part extended in the decorative panel may be divided and attached to the decorative panel.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, it is possible to add, delete, and replace other components in the configuration of each embodiment.

  For example, the configuration of the present invention may be applied to only a part where the effect of the present invention is particularly desired, instead of providing the partition plate all around the end of the outlet adjacent to the corner of the heat exchanger. The dimensions in the height direction and the width direction may be changed according to the effect for each partition provided at each end. In addition, any of the above-described embodiments can be applied to each partition provided at each end.

100 indoor units,
1 makeup panel,
2 cases,
3 suction grills,
4 wind direction board,
5 outlets,
6 motors,
7 centrifugal fans,
8 heat exchangers,
9, 29 drain pan,
10 bell mice,
11 electrical goods box,
15 Arrow indicating air drawn from the room
16 filters,
17, 17a-17j, 117, 117a-117d Arrows showing air blown out from the heat exchanger into the room,
18 Arrow indicating air discharged from centrifugal fan,
19 centrifugal fan,
20 outlet flow path,
21 drain pump,
22 machine room,
23 A dashed line indicating the projection position of the air outlet 5,
41, 42, 43, 44, 45 Partition plate,
43a slit,
130, 131 stagnant area

Claims (9)

An indoor unit of an air conditioner embedded in a ceiling,
A housing constituting the upper surface and the side surface of the indoor unit;
A centrifugal blower that sucks in air from below and discharges it to the side,
A heat exchanger comprising a straight portion and a bent portion surrounding the sides of the centrifugal fan;
A drain pan provided below the heat exchanger to receive condensation water;
An outlet provided between an outer wall surface of the drain pan and a side surface of the housing;
A partition plate provided in the vicinity of the longitudinal direction end of the blowout port with the substantially short direction of the blowout port facing,
Equipped with
While providing a predetermined gap between the upper end of the partition plate and the upper surface of the housing,
The lower end of the partition plate is located below the upper end of the outer wall surface of the drain pan. In the indoor unit of the air conditioner according to claim 1,
An indoor unit of an air conditioner according to claim 1, wherein an inner end portion of the partition plate is in contact with or further inward to an outer wall surface of the drain pan. In the indoor unit of the air conditioner according to claim 1,
An indoor unit of an air conditioner according to claim 1, wherein the distance between the partition plate and the outlet end in the horizontal cross section of the partition plate is large outside the casing and small inside the casing. In the indoor unit of the air conditioner according to claim 1,
The indoor unit of an air conditioner according to claim 1, wherein the partition plate is integrally formed with the drain pan. In the air-conditioned indoor unit according to claim 1,
An indoor unit of an air conditioner characterized in that the partition plate is provided with a slit extending in a short direction of the outlet. In the indoor unit of the air conditioner according to claim 1,
An indoor unit of an air conditioner according to claim 1, wherein the outer wall surface of the drain pan has a recess in the longitudinal direction of the outlet. In the indoor unit of the air conditioner according to claim 6,
An indoor unit of an air conditioner according to claim 1, wherein a lower end of the partition plate protrudes so as to be positioned in a recess of an outer wall surface of the drain pan. In the air conditioner indoor unit according to claim 7,
The indoor unit of an air conditioner according to claim 1, wherein the partition plate is extended into the outlet of the decorative panel. The indoor unit of the air conditioner according to any one of claims 1 to 8.
The size of the gap between the upper end of the partition plate and the upper surface of the housing is
20 to 80% of the distance between the upper end of the outer wall surface of the drain pan and the upper surface of the casing.

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