JP6241959B2 - Air conditioner indoor unit - Google Patents

Description

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

  As a background art in this technical field, there is JP 2012-251676 A (Patent Document 1). In the indoor unit for an air conditioner described in Patent Document 1, as shown in claim 1, a heat exchanger (15) is provided in the case (20) on the downstream side of the air flow from the heat exchanger (15). ) Passing through the heat exchanger (15) and flowing out to the outside in the horizontal direction is turned downward to form a blowout passage (40) that is guided to the blowout port (28). (40) is an outer wall (26) that faces the heat exchanger (15) outward in the horizontal direction and changes the direction of the air that flows out of the heat exchanger (15) outward in the horizontal direction downward; The opposing wall portion (50) is opposed to the outer side wall portion (26) in the horizontal direction, and the opposing wall portion (50) has an upper edge surface (51) and an upper edge surface (51). ) And an outer surface (52) positioned below the upper edge surface (51) in the horizontal direction. Moiety is a convex curved surface (53), it is disclosed that smoothly continuous with the outer surface (52) located thereunder.

  And in Claim 2 of patent document 1, the said outer side surface (52) has the 2nd convex curved surface (54) convex on the horizontal direction outer side which continues smoothly with the convex curved surface (53) of the said upper edge surface (51). It is disclosed that the convex curved surface (53) and the second convex curved surface (54) form a convex curved convex surface (55) on the outer side in the horizontal direction. The outer surface (52) further includes a concave surface (57), and the concave surface (57) is located below the curved convex surface (55) and smoothly continues to the curved convex surface (55). In addition, the blowout channel (40) is recessed inwardly than the channel width (W1) between the curved convex surface (55) and the outer wall portion (26). It is disclosed that the flow path width (W2) between the outer wall portion (26) and the outer wall portion (26) is larger.

JP2012-251676

  The indoor unit operates with a wide range of flow rates, but the flow field at the outlet varies with the flow rate. Therefore, as in the configuration of the conventional patent document 1, a convex curved convex surface (55) is formed outward in the horizontal direction by the convex curved surface (53) and the second convex curved surface (54) on the upper edge surface (51) of the drain pan. If the concave surface (57) having a shape recessed inward in the horizontal direction is provided below the curved convex surface (55), the airflow may adhere to the wall surface if the flow rate is small, but if the flow rate is large, the airflow Is peeled off at the upper edge surface (51) of the drain pan, and this peeling cannot be suppressed on the downstream side. In other words, when the flow rate is increased, the upper edge surface (51) of the drain pan flows to the downstream side with separation, so that the effective channel width of the outlet channel is reduced and the pressure loss is increased. May cause deterioration.

  Therefore, the present invention provides an indoor unit for an air conditioner that suppresses an increase in pressure loss by ensuring an effective flow path width of an outlet flow path, regardless of increase or decrease in air flow rate, and improves energy saving performance. For the purpose.

In order to solve the above problems, in the present invention, “a fan that exhales air arranged in the central portion of the indoor unit in the circumferential direction, and heat of the air and refrigerant from the fan arranged in the circumferential direction of the fan” In an indoor unit of an air conditioner having a heat exchanger for exchanging and a drain pan for collecting water condensed in the heat exchanger, in the downstream wall of the drain pan downstream of the heat exchanger, the downstream wall between the uppermost end to the lower end portion of the drain pan, and the delamination portion toward the inner wall descending portion on the downstream side from the uppermost end of the downstream wall is formed, Ru and further separation preventing portion in the inner wall descending portion formed At the same time, the separation generating part is formed by connecting the inner wall upper inclined part inclined downward from the uppermost end of the downstream wall toward the outer wall and the downstream inner wall descending part. '' The And butterflies.

According to the present invention, there is provided an indoor unit for an air conditioner that suppresses an increase in pressure loss by ensuring an effective flow path width of an outlet flow path, regardless of increase or decrease in air flow rate, and improves energy saving performance. It becomes possible to do.
Other problems, configurations, operations, and effects of the present invention will be described in detail in the following examples.

It is a perspective view of the indoor unit of an air conditioner. It is sectional drawing perpendicular | vertical with respect to the fan rotating shaft of the indoor unit of an air conditioner. It is the AA cross section in FIG. 2 when a present Example is not applied. It is an enlarged view of the blower outlet periphery when not applying a present Example. It is the flow velocity distribution around the outlet of the current aircraft obtained from the analysis results. It is an enlarged view of the blower outlet periphery in a present Example. It is the flow velocity distribution around the blower outlet in the present Example obtained from the analysis result. FIG. 8 is a flow velocity distribution around the outlet in the present embodiment obtained from an analysis result at a flow rate of about 1.4 times the analysis result shown in FIG. FIG. 8 is a flow velocity distribution around the outlet in the present embodiment obtained from an analysis result at a flow rate about 0.5 times the analysis result shown in FIG. It is a perspective view of the blower outlet periphery in a present Example. It is an enlarged view of the blower outlet periphery in a present Example.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of an indoor unit of a general air conditioner. The indoor unit shown in FIG. 1 is connected to an outdoor unit (not shown) via a refrigerant pipe to constitute an air conditioner. The outdoor unit is equipped with a compressor, and the refrigerant is compressed and circulated by the compressor to form a refrigeration cycle. The indoor unit includes a casing 1 disposed in the ceiling and a panel 2 attached to the indoor side of the casing 1. The panel 2 is provided with a grill 3 for taking in air and four outlets 4 for blowing the air sucked from the grill 3 into the room. A louver 5 is attached to each of the outlets 4 to adjust the air blowing direction in the vertical direction or the horizontal direction.

  FIG. 2 is a cross-sectional view of the indoor unit of FIG. 1 viewed perpendicularly to the fan rotation axis. As shown in FIG. 2, the indoor unit according to the present embodiment is arranged so as to surround the centrifugal fan 6 in the circumferential direction of the centrifugal fan 6 and the centrifugal fan 6 that discharges air arranged in the center of the indoor unit in the circumferential direction. And a heat exchanger 7 that performs heat exchange between the air from the centrifugal fan 6 and the refrigerant. Although not shown in FIG. 2, the indoor unit has a drain pan 9 for collecting the condensed water in the heat exchanger 7 in the downward direction in the state where the indoor unit is installed. It flows into the drain pan 9 by falling according to gravity.

  FIG. 3 is an AA cross section in FIG. Here, a shape to which the present invention is not applied will be described first. By rotating the centrifugal fan 6 about the rotation axis Z by the motor 20 connected to the centrifugal fan 6, air is sucked through the filter 21 attached to the grill 3. The sucked air passes through the bell mouth 22 whose opening is gradually narrowed toward the centrifugal fan 6, and is blown out in the outer peripheral direction by the centrifugal fan 6. The blown air passes through the heat exchanger 7 and flows out of the heat exchanger 7, and then the flow direction changes from the horizontal direction to the vertically downward direction by the outer wall 8. The air whose direction is changed is discharged into the room from the outlet 4 to form an air flow 50 shown in the figure. When the air shown in the airflow 50 is blown into the room from the blowout port 4, the wind direction is adjusted by the louver 5 attached to the heat exchanger side in the short direction at the blowout port 4 of the panel 2.

  During the heating operation or the cooling operation, the heat exchanger 7 performs heat exchange between the air and the refrigerant flowing through the heat exchanger 7, thereby heating or cooling the indoor air. Between the filter 21 and the bell mouth 22, an electrical component box 23 containing a control board (not shown) for controlling the behavior of the indoor unit is attached to the lower portion of the bell mouth 22.

  FIG. 4 shows an enlarged view around the outlet of FIG. 3, and shows a case where the present invention is not applied as described above. The airflow 50a passing through the upper part of the heat exchanger 7 or the airflow 50b passing through the center of the heat exchanger 7 is changed in the flow direction from the horizontal direction to the vertical direction by the outer wall 8 of the drain pan 9 after passing through the heat exchanger 7. It blows out into the room through the outlet 4. This drain pan 9 is provided in the lower part of the heat exchanger 7, and plays the role of storing water condensed in the heat exchanger 7 during cooling operation. The drain pan 9 is configured to receive water at the bottom, and an upstream wall 9a and a downstream wall 9b that are directed upward are formed at both ends of the bottom in the short direction. The airflow 50c flowing under the heat exchanger 7 is a flow along the upstream wall 9a and the downstream wall 9b. The airflow 50c whose direction of flow is changed upward by the downstream wall 9b is merged with the airflows 50a and 50b, so that the direction of flow is changed downward and the airflow 50c is blown into the room from the outlet 4.

  At this time, the flow direction of the air flow 50c is bent 180 degrees from the upper side to the lower side by the downstream wall 9b, so that the flow is separated at the upper end 10 of the downstream wall 9b due to this sudden flow change, and the inner wall 11 of the downstream wall 9b A large peeling area 51 is formed in the vicinity. Then, the effective flow path width 60 which is the flow path width formed by the flow that can effectively use the blowout port 4 is narrowed by the separation region 51, and the power consumption increases as the pressure loss of the blowout port 4 increases. End up.

  FIG. 5 shows the flow velocity distribution around the outlet obtained from the analysis result. At this time, the flow velocity distribution is displayed with the maximum flow velocity in FIG. As shown in FIG. 5, it can be seen that the flow is separated at the upper end 10 of the downstream wall 9b, and a large separation region 51 is formed on the inner wall 11 of the downstream wall 9b. As a result, the effective flow path width 60 of the outlet 4 is narrowed, and the power consumption increases as the pressure loss of the outlet 4 increases. Embodiments of the present invention that solve this problem will be described below with reference to the drawings.

  FIG. 6 is an enlarged view around the outlet in the embodiment of the present invention. As shown in FIG. 6, in the present embodiment, in the downstream wall 9b of the drain pan 9 on the downstream side of the heat exchanger 7, between the upper end 10 of the downstream wall 9b and the lower end portion 12 of the drain pan 9, and in the downstream wall 9b. The peeling generation part 100 is intentionally formed from the upper end 10 toward the downstream inner wall lowering part 101, and then the peeling suppressing part is formed in the inner wall lowering part 101. More specifically, in the downstream wall 9b of the drain pan 9 on the downstream side of the heat exchanger 7, between the upper end 10 of the downstream wall 9b and the lower end portion 12 of the drain pan 9, the upper end 10 of the downstream wall 9b extends to the outer wall 8. The inner wall upper inclined portion 102 inclined downward and the inner wall lowering portion 101 having a shape descending substantially vertically downward are further connected to form a separation generating portion.

  By forming this separation generating portion 100, after deliberately generating separation, by providing the inner wall descending portion 101 on the downstream side of the separation generating portion 100, subsequent separation can be suppressed, and the air flow rate can be reduced. Regardless of the size, it is possible to keep the degree of peeling in the minute peeling area 51a shown in FIG. Therefore, the large-scale peeling area 51 shown in FIGS. 4 and 5 can be suppressed.

  In other words, since the flow rate of air blown out from the indoor unit varies greatly, the flow field of the blowout port varies depending on the flow rate. Therefore, as in the configuration of the conventional patent document 1, a convex curved convex surface (55) is formed outward in the horizontal direction by the convex curved surface (53) and the second convex curved surface (54) on the upper edge surface (51) of the drain pan. If the concave surface (57) having a shape recessed inward in the horizontal direction is provided below the curved convex surface (55), the airflow may adhere to the wall surface if the flow rate is small, but if the flow rate is large, the airflow Is peeled off at the upper edge surface (51) of the drain pan, and this peeling cannot be suppressed on the downstream side. Therefore, if the flow rate is increased, the upper edge surface (51) of the drain pan flows to the downstream side with separation, so that the effective channel width of the outlet channel is reduced and the pressure loss is increased. The present inventor has found that there is a risk of worsening the above. In order to solve this problem, the present inventor has conceived the shape of the present invention. According to the shape of the outlet of the above-described embodiment of the present invention, the peeling can be suppressed regardless of the flow rate. This point will be described below with reference to the drawings.

  FIG. 7 shows the flow velocity distribution around the outlet in the present embodiment obtained from the analysis results. In FIG. 7, the flow velocity distribution is displayed with the maximum flow velocity being 1. The peeling area 51 a generated by the peeling generation part 100 can be kept to a minimum by the peeling generation part formed by the inner wall descending part 101. When the peeling area 51 shown in FIG. 5 and the peeling area 51a shown in FIG. 7 are compared, the peeling area 51a shown in FIG. 7 is clearly smaller. Can be suppressed. Similarly, the effective flow path width 60 is also wider in FIG. 7 than in FIG. 5, and the pressure loss at the outlet 4 is smaller in FIG. 7 than in FIG. 5.

  FIG. 8 is a flow velocity distribution around the outlet in the present embodiment obtained from the analysis result at a flow rate of about 1.4 times the analysis result shown in FIG. 7. The maximum flow velocity in FIG. Show. FIG. 9 is a flow velocity distribution around the outlet in the present embodiment obtained from the analysis result at a flow rate of about 0.5 times the analysis result shown in FIG. 7. The flow velocity distribution is shown with the maximum flow velocity in FIG. Show.

  Here, the flow rate of the analysis result shown in FIG. 8 is approximately twice the flow rate of the analysis result shown in FIG. 9, but the peeling that occurs in the peeling generation unit 100 is caused by the peeling suppression unit formed by the inner wall descending part 101. It can be seen that the peeled areas 51a are approximately the same. Further, it can be seen that the flow velocity distribution is almost the same when FIG. 8 and FIG. 9 are compared. This is because by providing the peeling generation part 100 and the peeling suppression part 101 in the downstream wall 9b of the drain pan 9 downstream from the heat exchanger 7, the starting point of peeling can be fixed to the peeling generation part 100, and this peeling is peeled off. Since it is restrained by the restraining part 101, even if the flow rate is changed, it is possible to keep the peeling area 51a of almost the same degree. As a result, even when the flow rate changes, the flow velocity distribution when the maximum flow velocity at the outlet 4 is 1 can be made substantially the same.

  In the present embodiment, the inner wall descending portion 101 (peeling suppression portion) is formed from the peeling generating portion 100 in a substantially vertical downward direction. Thereby, it is possible to effectively suppress the peeling generated by the peeling generation unit 100. If the inner wall descending portion 101 (peeling suppression portion) is inclined toward the outer wall 8 and is formed substantially vertically downward, the flow path width of the outlet 4 is narrowed by the inner wall descending portion 101, which is sufficient. The effect is not obtained. On the other hand, if the inner wall descending portion 101 (peeling suppression portion) is inclined toward the heat exchanger 7 and formed substantially vertically downward, the function of suppressing the delamination generated by the delamination generation unit 100 is provided. When the air flow rate increases, a large-scale peeling area is generated. If it does so, since the effective flow path width of a blower outlet flow path will become narrow as mentioned above and pressure loss will increase, it will cause deterioration of energy-saving property.

  In the present embodiment, the angle formed by the inner wall descending portion 101 (peeling suppressing portion) and the inner wall upper inclined portion 102 on the heat exchanger 7 side is configured to be an obtuse angle. As a result, the delamination generated by the delamination generation unit 100 can be effectively suppressed by the inner wall lowering unit 101 (debonding suppression unit). If the angle formed between the inner wall descending portion 101 (separation suppressing portion) and the inner wall upper inclined portion 102 on the heat exchanger 7 side is a right angle or an acute angle, the flow from the inner wall upper inclined portion 102 toward the inner wall descending portion 101 (separation suppressing portion). Since the direction of this will change abruptly, a large-scale exfoliation zone will arise. If it does so, the deterioration of energy saving mentioned above will be caused.

  FIG. 10 is a perspective view of the periphery of the outlet in this embodiment. By forming the peeling generation part 100 and the inner wall descending part 101 (peeling suppression part) over the entire longitudinal direction of the outlet 4, the peeling area 51 generated over the entire longitudinal direction of the outlet 4 is more effective. Can be suppressed. On the other hand, since the humidifier may be attached to the drain pan 9 as an option, the upper end 10 of the downstream wall 9 b of the drain pan 9 may partially expand toward the outer wall 8. At this time, because of the space limitation, the peeling generation part 100 and the inner wall descending part 101 (peeling suppression part) cannot be formed in the entire longitudinal direction of the outlet 4, but it does not necessarily extend over the entire longitudinal direction of the outlet 4. Thus, even if the peeling generation part 100 and the inner wall descending part 101 (peeling suppression part) are not continuously formed, it is possible to obtain a sufficient peeling suppression effect only by partial formation.

  Although the above example demonstrated the effect of reducing the pressure loss of the blowing port 4 by suppressing the separation zone 50 generated at the blowing port 4, in this example, not only the effect of reducing the pressure loss of the blowing port 4 but also cooling. There is also an effect of preventing dew condensation on the louver that adjusts the wind direction when air is blown into the room from the outlet 4 during operation. Hereinafter, the effect of preventing condensation on the louver will be described.

  Since the louver 5 shown in FIG. 3 is attached to the heat exchanger side in the short direction of the outlet 4 of the panel 2, the outlet 4 side of the louver 5 is always cooled during the cooling operation. In this case, by using a heat insulating material for the louver 5, the temperature on the heat exchanger side of the louver 5 approaches room temperature, so that condensation on the louver 5 can be prevented.

  FIG. 11 is an enlarged view of the vicinity of the outlet in the present embodiment. Although the louver 5a may be arranged at the center of the outlet 4 as shown in FIG. 11, if a heat insulating material is used for the louver 5a, the louver 5a becomes thick. There are cases where it is not possible. When this embodiment is not applied without using a heat insulating material, the large-scale peeling area 51 shown in FIGS. 4 and 5 obstructs the flow of air to the heat exchanger 7 side of the louver 5a. At this time, air is cooled from the outer wall 8 side of the louver 5a in which air normally flows, and the entire louver 5a is cooled. Since air does not flow to the heat exchanger 7 side of the louver 5a due to the separation region 51, the air on the heat exchanger 7 side of the louver 5a becomes room temperature. Due to the saturated vapor amount, when room temperature air comes into contact with the cooled louver 5a, condensation may occur and a problem of dew condensation may occur. However, since the separation region 51 can be suppressed by applying this embodiment, the cooled air can be effectively flowed to both sides of the louver 5a, and not only the pressure loss of the outlet 4 is reduced but also the louver 5a. An effect of preventing condensation can also be obtained. In addition, the present invention can obtain an effect regardless of the shape and mounting position of the louver 5a.

  In the above embodiment, the separation generating part 100 and the inner wall descending part 101 (peeling suppression part) are defined as a two-dimensional shape, but the outlet 4 of the indoor unit actually used has a three-dimensional structure. Similarly, the airflow is also three-dimensional. Therefore, the size and position of the peeling areas 51 and 51a vary depending on the position of the outlet 4 in the longitudinal direction. Therefore, it is possible to obtain a better effect by changing the positions of the peeling generation part 100 and the inner wall lowering part 101 (peeling suppression part) in accordance with the peeling areas 51 and 51a.

  Further, in the above embodiment, since it is easy to manufacture, the peeling generation portion 100, the inner wall descending portion 101, and the inner wall upper inclined portion 102 are integrated with the drain pan 9. However, if the configuration of the above embodiment can be achieved, it is different. It may be a part.

  Similarly, in the above embodiment, the explanation has been given for the indoor unit having four outlets. However, the fan and the heat exchanger are arranged, and the drain pan is provided for collecting the condensed water in the heat exchanger. Therefore, the present invention can be applied to any indoor unit having a flow path structure in which the direction of flow from the heat exchanger changes rapidly.

4 Outlet 5 Louver 7 Heat exchanger 9 Drain pan 9b Downstream wall 10 Upper end 51 of downstream wall 9b Peeling area 60 Effective flow path width 100 Peeling generation part 101 Inner wall descending part 102 Inclined part on inner wall

Claims (5)

A fan that exhales air arranged in the center of the indoor unit in the circumferential direction;
A heat exchanger that is arranged in the circumferential direction of the fan and performs heat exchange between the air from the fan and the refrigerant;
In the indoor unit of an air conditioner having a drain pan for collecting water condensed in the heat exchanger,
Separation in the downstream wall of the drain pan downstream from the heat exchanger between the uppermost end of the downstream wall and the lower end of the drain pan and from the uppermost end of the downstream wall toward the inner wall descending portion on the downstream side generating portion is formed, and further separation preventing portion in the inner wall descending portion formed Rutotomoni,
The peeling generation part is formed by connecting an inner wall upper inclined part inclined downward from an uppermost end of the downstream wall toward an outer wall and a downstream inner wall descending part. Air conditioner indoor unit. The indoor unit of an air conditioner according to claim 1 , wherein the inner wall descending part is formed in a substantially vertical downward direction from the separation generating part. The indoor unit of an air conditioner according to claim 1 , wherein the inner wall descending part and the inner wall upper inclined part are formed such that an angle formed on the heat exchanger side becomes an obtuse angle. The indoor unit of an air conditioner according to claim 1 , wherein the separation generating unit is arranged by a predetermined length in the longitudinal direction of the outlet. A fan that exhales air arranged in the center of the indoor unit in the circumferential direction;
A heat exchanger that is arranged in the circumferential direction of the fan and performs heat exchange between the air from the fan and the refrigerant;
In the indoor unit of an air conditioner having a drain pan for collecting water condensed in the heat exchanger,
The downstream wall of the drain pan on the downstream side of the heat exchanger is formed with an inner wall upper inclined portion inclined downward from the uppermost end of the downstream wall toward the outer wall, and substantially vertically downward from the inner wall upper inclined portion. An indoor unit for an air conditioner, which is formed by connecting an inner wall descending portion to be connected.

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