JP2013108716A - Ceiling-embedded type indoor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an air vortex, a ventilation resistance, and a sound due to the air vortex.SOLUTION: An indoor air suction port 32 is formed at a lower face of a casing 30 in the ceiling-embedded type indoor device 20. A panel 40 is located near the suction port 32 and has a center member 41 and a suction opening portion 42. The center member 41 is located substantially at the center of the suction port 32 when seen in a vertical direction. The suction opening portion 42 is a circular opening surrounding the center member 41. A fan 50 is located within the casing 30, generates a first air flow directing to the fan 50 through the suction opening portion 42, and is located at an airflow downstream side of the panel 40. An auxiliary opening 46 is formed at the center member 41.

Description

  The present invention relates to a ceiling-embedded indoor unit.

  As an indoor unit of an air conditioner of the type installed on the ceiling, for example, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2011-27336), a substantially rectangular decorative panel is attached to the lower surface of the casing. There is something. A fan for generating airflow is housed inside the casing. And the suction grille in which the suction inlet was formed is attached to the center part of the decorative panel and the lower side of the fan. Thereby, indoor air will be suck | inhaled via the suction inlet in the inside of a casing.

  The decorative panel and the suction grille are components on the lower surface of the indoor unit, and are easy to touch. For this reason, the design related to the lower surface may be an important element in selecting a product depending on the person. However, in the indoor unit of Patent Document 1, when the indoor unit is looked up from below, the inside of the casing can be seen from the suction port, and the design is impaired.

  On the other hand, a method of concealing the inside of the casing by concealing the suction port with another panel and providing an annular suction opening in this panel is conceivable. However, if the side surface of the central member surrounded by the annular suction opening extends along the vertical direction, the air sucked into the casing from the suction opening becomes difficult to flow smoothly, and the air is The vortex is made.

  An object of the present invention is to suppress the generation of air vortices.

  The ceiling-embedded indoor unit according to the first aspect of the present invention includes a casing, a panel, and a fan. An opening for sucking air is formed in the lower surface of the casing. The panel is located near the opening and has a central member and a suction opening. The central member is located at the approximate center of the opening when viewed from the vertical direction. The suction opening is an annular opening surrounding the central member. The fan is located inside the casing. A fan produces | generates the airflow which goes to a fan via a suction opening part, and is located in the downstream of an airflow rather than a panel. An auxiliary opening is formed in the central member.

  An auxiliary opening is formed in the central member of the indoor unit. Therefore, an air flow that reduces the phenomenon of air separation from the air flow is separately generated by the auxiliary opening. As a result, the air flow toward the fan through the suction opening is pulled upward by the air flow separately generated by the auxiliary opening, and the air is separated from the air flow toward the fan through the suction opening. This is suppressed. Accordingly, generation of air vortices can be suppressed, and generation of sound due to ventilation resistance and air vortices can be suppressed.

  The ceiling-embedded indoor unit according to the second aspect of the present invention is the indoor unit according to the first aspect, wherein the auxiliary opening is formed in a cross shape when the panel is viewed from the vertical direction.

  As a result, air is taken into the casing from the cross-shaped auxiliary opening.

  The ceiling-embedded indoor unit according to the third aspect of the present invention is the indoor unit according to the first aspect or the second aspect, wherein the air flow is at the center side of the central member as the air travels from the suction opening to the fan. It is a flow that approaches.

  Thereby, the air sucked into the casing from the suction opening flows toward the center with respect to the vertical direction, and can surely go to the fan.

  The ceiling-embedded indoor unit according to the fourth aspect of the present invention is the indoor unit according to the third aspect, wherein the reference surface that is the lower surface of the central member is substantially horizontal. A side surface extending upward from the periphery of the reference surface is inclined at a first predetermined angle with respect to the reference surface. The formation surface that forms the auxiliary opening by extending upward from the reference surface of the central member is inclined at a second predetermined angle with respect to the reference surface. The first predetermined angle is smaller than the second predetermined angle.

  The air sucked from the suction opening outside the central member is more likely to be swirled due to the position of the fan suction port than the air sucked from the auxiliary opening of the central member. However, in this indoor unit, the inclination angle of the side surface of the central member with respect to the reference surface is steeper than the inclination angle of the formation surface of the auxiliary opening with respect to the reference surface. Become. Moreover, the air sucked into the casing from the annular suction opening is guided into the casing along the side surface of the central member that is an inclined surface. Therefore, the side surface of the central member plays a role as a guide for suppressing separation of the air flow.

  The ceiling-embedded indoor unit according to the fifth aspect of the present invention is the indoor unit according to the first to fourth aspects, in which the suction opening is wider than the auxiliary opening.

  Thereby, the amount of air sucked from the suction opening is larger than the air sucked from the auxiliary opening. Furthermore, since the auxiliary opening is located on the center side of the suction opening, the inside of the casing is generally easier to see from the auxiliary opening than from the suction opening. Since the width is smaller than the width of the suction opening, the inside of the casing is difficult to see from the auxiliary opening.

  The ceiling-embedded indoor unit according to the sixth aspect of the present invention is the indoor unit according to the first to fifth aspects, wherein the width of the suction opening on the upper surface side of the panel is the suction opening on the lower surface side of the panel Greater than the width of

  As a result, the pressure of the air flowing from the lower surface side of the panel to the upper surface side through the suction opening and moving toward the inside of the casing is compared to the case where the width of the suction opening is the same on the upper surface side and the lower surface side of the panel. Therefore, since it is difficult to change rapidly, it is possible to effectively generate air vortices and prevent noise.

  The ceiling-embedded indoor unit according to the seventh aspect of the present invention is the indoor unit according to the first to sixth aspects, wherein the upper surface of the central member protrudes upward and is curved.

  Thereby, the air introduced into the casing from the annular suction opening flows more smoothly along the side surface and the upper surface of the central member to the fan side. Therefore, the generation of air vortices can be more effectively suppressed.

The ceiling-embedded indoor unit according to the eighth aspect of the present invention is the indoor unit according to the first to seventh aspects, in which the panel is hollow.
Thereby, the weight of a panel can be reduced.

  According to the indoor unit pertaining to the first aspect of the present invention, the generation of air vortices can be suppressed, and the generation of sound due to ventilation resistance and air vortices can be suppressed.

  According to the indoor unit according to the second aspect of the present invention, air is taken into the casing from the cross-shaped auxiliary opening.

  According to the indoor unit according to the third aspect of the present invention, the air sucked into the casing from the suction opening flows toward the center with respect to the vertical direction, and can surely go to the fan.

  According to the indoor unit according to the fourth aspect of the present invention, the inclination angle of the side surface of the central member with respect to the reference surface is steeper than the inclination angle of the auxiliary opening forming surface with respect to the reference surface, and thus occurs near the side surface of the central member. The vortex to be generated is less likely to occur. Moreover, the air sucked into the casing from the annular suction opening is guided into the casing along the side surface of the central member that is an inclined surface. Therefore, the side surface of the central member plays a role as a guide for suppressing separation of the air flow.

  According to the indoor unit pertaining to the fifth aspect of the present invention, the amount of air sucked from the suction opening is greater than the air sucked from the auxiliary opening. Furthermore, the inside of the casing is less visible from the auxiliary opening.

  According to the indoor unit according to the sixth aspect of the present invention, the pressure of the air flowing from the lower surface side of the panel to the upper surface side through the suction opening portion toward the inside of the casing is such that the width of the suction opening portion is the upper surface side of the panel. Since it is less likely to change abruptly as compared with the case of the same on the lower surface side, it is possible to effectively generate air vortices and prevent noise.

  According to the indoor unit pertaining to the seventh aspect of the present invention, the generation of air vortices can be more effectively suppressed.

  With the indoor unit according to the eighth aspect of the present invention, the weight of the panel can be reduced.

The schematic block diagram of the air conditioning apparatus which concerns on this embodiment. II-II sectional drawing of the indoor unit of FIG. 1 embedded in the ceiling. The expanded view of the panel vicinity among sectional drawings of the indoor unit of FIG. The figure at the time of seeing the panel concerning this embodiment from the perpendicular direction. It is II-II sectional drawing of the indoor unit of FIG. 1 embedded in the ceiling, Comprising: The figure which shows the flow of the air introduce | transduced inside a casing.

  Hereinafter, a ceiling-embedded indoor unit according to the present invention will be described in detail with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Overview FIG. 1 is an external view of an air conditioner 100 including an indoor unit 20 according to the present embodiment. The air conditioner 100 is configured by being divided into an outdoor unit 10 installed outdoors and an indoor unit 20 embedded in the ceiling of the air-conditioning target room RA in the building. The outdoor unit 10 and the indoor unit 20 are connected via refrigerant pipes L1, L2 for liquid refrigerant and gas refrigerant. Such an air conditioning apparatus 100 can perform an air conditioning operation including a cooling operation and a heating operation in the air conditioning target room RA.

  Although not shown, the outdoor unit 10 is provided with an outdoor heat exchanger (not shown), a compressor, and the like. The outdoor unit 10 compresses the refrigerant passing through the refrigerant pipes L1 and L2 or causes the outdoor heat exchanger to perform heat exchange between the refrigerant and the outside air, so that the refrigerant in a gas state or a liquid state is obtained. Or sent to the indoor unit 20.

  During the air conditioning operation, the indoor unit 20 exchanges refrigerant with the outdoor unit 10 and supplies air after air conditioning (hereinafter referred to as conditioned air) to the room. In particular, in the indoor unit 20 according to the present embodiment, a panel 40 is located near the suction port 32 (corresponding to the opening) on the lower surface of the casing 30 so as not to impair the design. The panel 40 is for preventing the designability from being impaired by preventing the inside of the casing 30 from being seen through the suction port 32 when the user looks up at the indoor unit 20 from below. Therefore, the panel 40 is positioned so as to substantially cover the suction port 32 (see FIGS. 1 and 4). However, when the panel 40 is completely covered, the room air is taken into the casing 30 from the suction port 32. Will not be able to. Therefore, the panel 40 has a suction opening 42 for taking in indoor air into the casing 30, and the central member 41 has an auxiliary opening 46 (see FIG. 4). Details of the panel 40 will be described later.

  By the way, in the description of the present embodiment, expressions indicating directions such as “up”, “down”, “vertical”, “horizontal” and the like are used as appropriate, but in these cases, the indoor unit 20 is installed in the state of FIG. Represents each direction in the state.

(2) Configuration of Indoor Unit Next, the configuration of the indoor unit 20 according to the present embodiment will be described in detail. As shown in FIGS. 1 to 4, the indoor unit 20 mainly includes a casing 30, a fan 50, a panel 40, an indoor heat exchanger 60, and a filter 70.

(2-1) Casing The casing 30 is inserted and installed in an opening (not shown) formed in the ceiling in the air conditioning target room RA, and has a box shape. Specifically, the side surface of the casing 30 has an approximately octagonal shape in which long sides and short sides are alternately and continuously formed in a top view (FIG. 1), and the bottom surface is substantially quadrangular. It has a shape.

  And on the lower surface of the casing 30, four blowing ports 31a, 31b, 31c, and 31d are formed along the peripheral edge of the lower surface. One suction port 32 is provided at a position on the lower surface of the casing 30 surrounded by the blowout ports 31a to 31d. That is, the suction port 32 is provided at the approximate center of the lower surface of the casing 30. The outlets 31a to 31d each have a substantially quadrangular shape elongated in the peripheral direction of the lower surface of the casing 30, and the suction port 32 has a substantially quadrangular shape. The room air in the air-conditioning target room RA is sucked into the casing 30 from the suction port 32, and the air-conditioned air is blown out from the air outlets 31a to 31d to the air-conditioning target room RA. In particular, since the outlets 31a to 31d are provided along the peripheral edge of the lower surface of the casing 30, the indoor unit 20 can blow out the conditioned air in different directions.

  In addition, horizontal flaps 33a to 33d are provided at the respective outlets 31a to 31d. The horizontal flaps 33a to 33d guide the air blown from the blowout ports 31a to 31d in a desired direction. The horizontal flaps 33a to 33d are rotationally driven by a flap motor (not shown), and can change the guiding direction of the conditioned air or close the outlets 31a to 31d.

  Further, an opening (not shown) through which a part of each refrigerant pipe L1, L2 passes is formed on the side surface of the casing 30. Thereby, refrigerant | coolant piping L1, L2 comes to be connected with the indoor heat exchanger 60 (FIG. 2).

(2-2) Fan The fan 50 is located above the panel 40 and inside the casing 30, as shown in FIG. The fan 50 generates a first air flow (corresponding to an air flow; broken line arrow A in FIG. 5) that directs indoor air to the inside of the casing 30 through the suction opening 42, and in the indoor heat exchanger 60. It is a centrifugal blower which blows out the conditioned air after heat exchange from the inside of the casing 30 through each of the outlets 31a to 31d. That is, it can be said that the fan 50 is located downstream of the panel 40 in the first air flow. Further, the fan 50 also generates a second air flow (broken arrow B in FIG. 5) that is directed toward the inside of the casing 30 through the auxiliary opening 46 of the central member 41.

  As shown in FIG. 2, the fan 50 has a fan motor M50 provided at approximately the center of the upper surface of the casing 30, and an impeller (not shown) connected to the motor M50 and driven to rotate. ing. The impeller is an impeller having turbo blades, and can suck air into the impeller from below and blow out toward the outer peripheral side of the impeller when viewed from the vertical direction. The rotation speed of the fan motor M50 can be changed by a motor driver (not shown), whereby the fan 50 can control the air volume of the conditioned air blown from the blowout ports 31a to 31d.

(2-3) Panel As shown in FIG. 4, the panel 40 has a substantially quadrangular shape with rounded corners when viewed from the vertical direction. The size of the panel 40 is slightly larger than the suction port 32. As shown in FIG. 2, the panel 40 is fixed and positioned near the suction port 32 so as to shield (specifically, cover) the suction port 32 from the outside.

  In particular, the panel 40 according to the present embodiment has a hollow interior so as to reduce its weight. As shown in FIGS. 2 to 4, mainly the central member 41, the suction opening 42, and the like. And an annular member 43.

(2-3-1) Center Member As shown in FIG. 4, the center member 41 is located substantially at the center of the suction port 32 in the casing 30 when the panel 40 is viewed from the vertical direction. The central member 41 has a shape obtained by reducing the outer shape of the panel 40, that is, has a substantially quadrangular shape with rounded corners when the panel 40 is viewed from the vertical direction. The size of the central member 41 is smaller than the suction port 32 of the casing 30, and can be, for example, about 2/3 of the suction port 32. That is, it can be said that the central member 41 is a member for hiding the casing 30 provided mainly so that the inside of the casing 30 cannot be seen from below the indoor unit 20. As shown in FIG. 2, the reference surface 41a, which is the lower surface of the central member 41, is exposed in the air-conditioning target room RA, and the reference surface 41a is substantially horizontal.

  Further, as shown in FIG. 2, in the central member 41, a side surface 41b extending upward from the peripheral edge of the reference surface 41a is inclined toward the center of the central member 41 by a first predetermined angle α1 with respect to the vertical direction. That is, the central member 41 has a convex shape upward. And the upper surface 41c of the central member 41 is curving the angle | corner by the side of the suction opening part 42, protruding upwards. Accordingly, the central member 41 has a convex shape upward with rounded corners.

  In the present embodiment, as shown in FIG. 2, the first predetermined angle α <b> 1 is uniform over the entire periphery of the central member 41.

  The central member 41 is formed with an auxiliary opening 46 as shown in FIGS. The auxiliary opening 46 is an opening for generating a second air flow (broken arrow B in FIG. 5) that reduces the phenomenon of air separation from the first air flow (broken arrow A in FIG. 5). As shown, when the panel 40 is viewed from the vertical direction, it is formed in a cross shape. Specifically, the auxiliary opening 46 has substantially the same width w1 in the vertical direction and the horizontal direction when the panel 40 is viewed from the vertical direction. Furthermore, the formation surface 46a that forms the auxiliary opening 46 by extending upward from the reference surface 41a of the central member 41 is inclined by the second predetermined angle α2 closer to the suction opening 42 with respect to the vertical direction. The first predetermined angle α1 is smaller than the second predetermined angle α2 between the first predetermined angle α1 at the side surface 41b of the central member 41 and the second predetermined angle α2 of the formation surface 46a at the auxiliary opening 46. That is, the first predetermined angle α1 is steeper than the second predetermined angle α2.

  In the present embodiment, as shown in FIG. 2, the second predetermined angle α <b> 2 is uniform over the entire periphery of the auxiliary opening 46.

  Consider a case where the auxiliary opening 46 is not formed in the central member 41, and the side surface of the central member 41 is not inclined with respect to the reference surface 41a and extends along the vertical direction. In this case, the vortex of the indoor air sucked into the casing 30 from the suction opening 42 is generated near the side surface and the upper surface of the central member 41, and the air flow of the indoor air is disturbed.

  However, according to the central member 41 according to the present embodiment described above, the central member 41 is formed with the auxiliary opening 46 as shown in FIGS. 2 to 5, and the side surface 41 b of the central member 41 is the reference. It is inclined toward the center with respect to the surface 41a. Therefore, the flow of room air taken into the casing 30 through the suction opening 42 becomes a first air flow that flows toward the fan 50 along the side surface 41b of the central member 41 (broken arrow A in FIG. 5). ). More specifically, it can be said that the first air flow is such a flow that the indoor air approaches the central side of the central member 41 as it goes from the suction opening 42 to the fan 50. On the other hand, the flow of room air taken into the casing 30 through the auxiliary opening 46 becomes a second air flow that flows toward the fan 50 along the formation surface 46a of the auxiliary opening 46 (broken line arrow B in FIG. 5). ). In particular, since the forming surface 46a of the auxiliary opening 46 has a larger inclination angle with respect to the reference surface 41a than the side surface 41b of the central member 41, the second air flow is not bent much compared to the first air flow, and the auxiliary air 46 It can be said that the flow is from the opening 46 toward the fan 50. Accordingly, the first air flow is pulled upward by the second air flow, and the phenomenon of air separation from the first air flow is suppressed. Accordingly, the generation of vortices in the room air in the first air flow is suppressed, and the generation of sound due to ventilation resistance and vortices can be suppressed. Furthermore, since the upper surface 41c of the central member 41 has a convex shape with rounded corners on the suction opening 42 side, the turbulence of the indoor air flow in the first air flow is further suppressed. It will be. From the above, it can be said that the side surface 41b of the central member 41 according to the present embodiment plays a role as a guide for suppressing separation of the air flow.

  Here, in order to define how upward the central member 41 having such a shape protrudes, as shown in FIG. 5, the height h1 from the reference surface 41a to the highest portion of the upper surface 41c, the first A numerical range of the first predetermined angle α1 and the second predetermined angle α2 will be described. The height h1 of the central member 41 is preferably about 10 mm or more, and more preferably about 30 mm or more. More specifically, the height h1 of the central member 41 is preferably in the range of about 30 mm to about 50 mm. The first predetermined angle α1 and the second predetermined angle α2 satisfy the condition that the first predetermined angle α1 is smaller than the second predetermined angle α2, and the first predetermined angle α1 is about 30 degrees to about 80. From the numerical value range of degrees, the second predetermined angle α2 can be selected from a numerical value range of about 60 degrees to about 90 degrees. For example, the first predetermined angle α1 can be about 30 degrees and the second predetermined angle α2 can be about 85 degrees. When the first predetermined angle α1 and the second predetermined angle α2 satisfy the above conditions and are selected from the respective numerical ranges, the side surface 41b of the central member 41 smoothly introduces indoor air into the casing 30. Therefore, the second air flow taken into the fan 50 side from the auxiliary opening 46 along the forming surface 46a is more effective than the first air flow of the room air taken in from the suction opening 42. Can be pulled.

  Further, the radius of curvature of the corner of the upper surface 41c of the central member 41 can be R100. An example of the width w1 of the auxiliary opening 46 is 25 mm.

(2-3-2) Suction opening As shown in FIGS. 2 to 4, the suction opening 42 is an annular opening that surrounds the central member 41. As described above, the indoor air is outside the indoor unit 20. It is a vent for indoor air when being taken into the casing 30 from the inside. As shown in FIG. 4, the width w2 of the suction opening 42 is sufficiently smaller than the horizontal width or vertical width of the central member 41 when viewed from the vertical direction. The width w2 of the suction opening 42 is larger than the width w1 of the auxiliary opening 46, and can be, for example, about twice the width w1 of the auxiliary opening 46. Specifically, when the width w1 of the auxiliary opening 46 is about 25 mm, the width w2 of the suction opening 42 is about 50 mm.

  As shown in FIG. 4, the suction opening 42 according to the present embodiment has rounded corners when the panel 40 is viewed from the vertical direction according to the shape of the central member 41.

  Furthermore, the width w2 of the suction opening 42 is different between the upper surface side and the lower surface side of the panel 40. Specifically, as shown in FIG. 3, the width w4 of the suction opening 42 on the upper surface side of the panel 40 (hereinafter referred to as the first width w4) is the width w5 of the suction opening 42 on the lower surface side of the panel 40. (Hereinafter referred to as the second width w5). This is to prevent the generation of air flow vortices due to pressure loss and the accompanying noise.

  Here, the reason why the first width w4 is made larger than the second width w5 will be specifically described. Since the first width w4 is on the upper surface side of the panel 40, it can be said that the first width w4 is closer to the inside of the casing 30 than the second width w5 side. Then, if the first width w4 and the second width w5 are the same, the pressure loss of the airflow flowing from the lower surface side of the panel 40 to the upper surface side through the suction opening 42 will increase. It becomes. That is, if the first width w4 and the second width w5 are made the same width, the space in the casing 30 increases at a stroke when the air flow passes near the upper surface of the panel 40, and therefore the pressure gradient of the air flow. Will grow rapidly. Then, the vortex of the air flow is easily generated, and noise is generated. However, in this embodiment, since the first width w4 of the suction opening 42 on the upper surface side of the panel 40 is larger than the second width w5 on the lower surface side, the first width w4 and the second width w5 are the same width. As compared with the above, it is possible to suppress a sudden increase in the pressure gradient of the air flow. Therefore, it is possible to suppress the generation of air flow vortices generated due to a large pressure loss and the accompanying noise.

  In the present embodiment, the central member 41 has a shape that curves while protruding upward, thereby realizing a form in which the first width w4 of the suction opening 42 is larger than the second width w5 on the lower surface side. .

(2-3-3) Annular member As shown in FIG. 4, the annular member 43 has the same shape as the suction opening 42 when the panel 40 is viewed from the vertical direction. It is located so as to surround it. The width w3 of the annular member 43 is always constant and can be, for example, in the range of about 30 mm to about 50 mm. The annular member 43 has rounded corners when the panel 40 is viewed from the vertical direction according to the shape of the suction opening 42.

  In particular, as shown in FIG. 2, the annular member 43 has a side surface 43 b that extends upward from the lower surface 43 a in contact with the suction opening 42 and is inclined toward the center of the central member 41 with respect to the vertical direction. That is, the side surface 43b of the annular member 43 in contact with the suction opening 42 does not extend along the vertical direction but is inclined toward the central member 41 side, like the side surface 41b of the central member 41. And as inclination-angle (alpha) 3 with respect to the lower surface 43a of the side surface 43b of the annular member 43, it exists in the range of about 170 degree | times-140 degree | times.

  In the present embodiment, the case where the inclination angle α3 is uniform over the entire periphery of the annular member 43 on the suction opening 42 side is shown.

  With the annular member 43 having such a shape, indoor air enters the casing 30 through the suction opening 42 as shown by a broken line arrow A in FIG. It is guided to the upper side of the panel 40 along the line 43b and flows reliably to the fan 50 located above the panel 40.

  As shown in FIG. 4, the central member 41 and the annular member 43 are positioned away from each other by the suction opening 42, but these are supported by elongated support members p <b> 1 and p <b> 2. Thereby, the central member 41, the suction opening 42, and the annular member 43 form one panel 40. Therefore, it can be said that the width w <b> 2 and the shape of the suction opening 42 are defined by the positions of the central member 41 and the annular member 43.

(2-4) Indoor Heat Exchanger As shown in FIG. 2, the indoor heat exchanger 60 is located inside the casing 30 and in the vicinity of the air blowing portion of the fan 50. The indoor heat exchanger 60 is connected to the refrigerant pipes L1 and L2, and is configured by a finned tube heat exchanger that is bent and arranged so as to surround the fan 50 when viewed from the vertical direction. Yes. The indoor heat exchanger 60 performs heat exchange with room air in the air-conditioning target room RA sucked from the suction opening 42 and the auxiliary opening 46.

  Specifically, the indoor heat exchanger 60 functions as a refrigerant evaporator during cooling operation. As a result, the indoor air sucked into the casing 30 is deprived of heat by the refrigerant flowing in the heat transfer tubes (not shown) constituting the indoor heat exchanger 60 and cooled. Conversely, the indoor heat exchanger 60 functions as a refrigerant radiator during heating operation. Thereby, the indoor air sucked into the casing 30 is deprived of heat from the refrigerant flowing through the heat transfer tubes constituting the indoor heat exchanger 60 and is warmed. The conditioned air after the heat exchange is performed by the indoor heat exchanger 60 is returned to the air-conditioning target room RA through the opened outlets 31a to 31d.

  A drain pan 61 is installed below the indoor heat exchanger 60 as shown in FIG. The drain pan 61 is for receiving drain water generated by condensation of moisture in the air by the indoor heat exchanger 60. Further, a bell mouth (not shown) for guiding room air to the fan 50 is disposed near the drain pan 61. The bell mouth has a circular shape when viewed from the vertical direction.

(2-5) Filter As shown in FIG. 2, the filter 70 is located between the fan 50 and the panel 40 inside the casing 30. Specifically, the filter 70 has a substantially quadrangular shape in accordance with the shape of the panel 40, and is supported and positioned near the upper surface of the panel 40 via a support member. The filter 70 removes dust from room air before being sucked into the fan 50 through the suction opening 42 and the auxiliary opening 46. Therefore, the air that has passed through the filter 70 becomes air that does not contain dust relatively, and is sent into the fan 50 through the bell mouth.

  In addition to the above, the indoor unit 20 includes a human detection sensor 91, a floor temperature sensor 92, and a control unit (not shown). The human detection sensor 91 and the floor temperature sensor 92 are provided on the lower surface of the casing 30 as shown in FIG. The control unit is provided inside the casing 30. The human detection sensor 91 detects the presence or absence of a person in the air conditioning target room RA, and the floor temperature sensor 92 detects the temperature of the floor in the air conditioning target room RA. The control unit is a microcomputer composed of a CPU and a memory. When receiving various operation instructions such as an air conditioning operation and a cleaning operation transmitted from a remote controller, for example, the control unit controls the rotational speed of the fan 50 and the horizontal flaps 33a to 33a. 33d open / close control and the like are performed.

(3) Features (3-1)
The indoor unit 20 of the present embodiment is a ceiling embedded type, and includes a casing 30, a panel 40, and a fan 50. In particular, the panel 40 includes a central member 41 located substantially at the center of the suction port 32 when viewed from the vertical direction, and a suction opening 42 that is an annular opening surrounding the central member 41. An auxiliary opening 46 is formed in the central member 41.

  The auxiliary opening 46 generates a second air flow that reduces the phenomenon of air separation from the first air flow (FIG. 5). Thus, the first air flow is pulled upward by the second air flow, and the separation of air from the first air flow is suppressed. Therefore, generation | occurrence | production of the air vortex can be suppressed and generation | occurrence | production of the sound by ventilation resistance and an air vortex can be suppressed.

(3-2)
Further, as shown in FIG. 4, the auxiliary opening 46 according to the present embodiment is formed in a cross shape when the panel 40 is viewed from the vertical direction. As a result, room air is taken into the casing 30 from the cross-shaped auxiliary opening 46.

(3-3)
By the way, the first air flow is such a flow that the room air approaches the central side of the central member 41 as it goes from the suction opening 42 to the fan 50, as indicated by a dashed arrow A in FIG. Thereby, the indoor air sucked into the casing 30 from the suction opening 42 flows toward the center with respect to the vertical direction, and can surely go to the fan 50.

(3-4)
In general, the indoor air sucked from the suction opening 42 which is outside the center member 41 is vortexed due to the position of the fan 50 with respect to the suction port rather than the air sucked from the auxiliary opening 46 of the center member 41. Is likely to occur. However, in the present embodiment, the side surface 41b of the central member 41 is inclined at the first predetermined angle α1 with respect to the reference surface 41a that is the lower surface. The formation surface 46a of the auxiliary opening 46 is inclined at the second predetermined angle α2 with respect to the reference surface 41a. The first predetermined angle α1 is smaller than the second predetermined angle α2. That is, the inclination angle (that is, the first predetermined angle α1) of the side surface 41b of the central member 41 with respect to the reference surface 41a is larger than the inclination angle (that is, the second predetermined angle α2) of the formation surface 46a of the auxiliary opening 46 with respect to the reference surface 41a. Therefore, the vortex generated near the side surface 41b of the central member 41 is less likely to occur. Further, the air sucked into the casing 30 from the annular suction opening 42 is guided into the casing 30 along the side surface 41b of the central member 41 that is an inclined surface. Therefore, the side surface 41b of the central member 41 plays a role as a guide for suppressing separation of the air flow.

(3-5)
In the present embodiment, the width w2 of the suction opening 42 is larger than the width w1 of the auxiliary opening 46. Thereby, the amount of room air sucked from the suction opening 42 is larger than the air sucked from the auxiliary opening 46. Further, since the auxiliary opening 46 is located on the center side of the suction opening 42, the inside of the casing 30 is generally easier to see from the auxiliary opening 46 than from the suction opening 42. In the form, since the width w1 of the auxiliary opening 46 is smaller than the width w2 of the suction opening 42, the inside of the casing 30 is difficult to see from the auxiliary opening 46.

(3-6)
In the present embodiment, the first width w4 of the suction opening 42 on the upper surface side of the panel 40 is larger than the second width w5 of the suction opening 42 on the lower surface side of the panel 40. Thereby, the pressure of the air flowing from the lower surface side to the upper surface side of the panel 40 through the suction opening 42 and moving toward the inside of the casing 30 is compared with the case where the first width w4 and the second width w5 are the same. Therefore, the air vortex can be generated and noise can be effectively prevented.

(3-7)
Furthermore, the upper surface 41c of the central member 41 according to the present embodiment protrudes upward and is curved. Thereby, the air introduced into the casing 30 from the annular suction opening 42 flows more smoothly along the side surface 41b and the upper surface 41c of the central member 41 to the fan 50 side. Therefore, the generation of air vortices can be more effectively suppressed.

(3-8)
Furthermore, the panel 40 of the present embodiment has a hollow interior. Thereby, the weight of the panel 40 can be reduced.

(4) Modification (4-1) Modification A
In the said embodiment, as shown in FIG. 4, the case where the center member 41 was a substantially quadrangular shape was demonstrated. However, the shape of the central member 41 is not limited to this, and may be any shape.

(4-2) Modification B
In the above embodiment, the case where the auxiliary opening 46 has a cross shape as shown in FIG. 4 has been described. However, the shape of the auxiliary opening 46 is not limited to this, and may be any shape.

(4-3) Modification C
In the above embodiment, as shown in FIG. 2, not only the auxiliary opening 46 is provided in the central member 41, but also the side surface 41 b of the central member 41 and the side surface 43 b of the annular member 43 are closer to the center of the central member 41. The case of tilting has been described. However, in the present invention, it is only necessary that the auxiliary opening 46 is provided at least in the central member 41, and the side surface 41b of the central member 41 and the side surface 43b of the annular member 43 do not have to be inclined toward the center.

(4-4) Modification D
In the above-described embodiment, the central member 41 has a shape that is curved while protruding upward, thereby realizing that the first width w4 of the suction opening 42 is larger than the second width w5 on the lower surface side. did. However, it is sufficient that the first width w4 of the suction opening 42 on the upper surface side of the panel 40 satisfies a condition that the first width w4 is larger than the second width w5 on the lower surface side, and the central member 41 is curved while protruding upward. Not necessary. For example, the side surface 41b of the central member 41 is a flat surface like the side surface 43b of the annular member 43, and the inclination angles of the side surface 41b of the central member 41 and the side surface 43b of the annular member 43 with respect to the reference surface 41a are adjusted. Thus, the indoor unit 20 may have a configuration in which the first width w4 is larger than the second width w5.

(4-5) Modification E
In the above embodiment, as shown in FIG. 2, the case where the formation surface 46 a of the auxiliary opening 46 is slightly inclined toward the suction opening 42 has been described. However, the formation surface 46a of the auxiliary opening 46 may not be inclined.

(4-6) Modification G
In the above embodiment, the case where the filter 70 has a substantially square shape has been described. However, the shape of the filter 70 is not limited to a quadrangle, and may be a substantially circular shape, for example. The indoor unit 20 may further include a cleaning unit for cleaning the filter 70.

(4-7) Modification H
In the above-described embodiment, the first predetermined angle α1 is within the numerical range of about 30 degrees to about 80 degrees, while satisfying the condition that the first predetermined angle α1 is smaller than the second predetermined angle α2. It has been described that α2 is selected from a numerical range of about 60 degrees to about 90 degrees. However, without satisfying the condition that the first predetermined angle α1 is smaller than the second predetermined angle α2, the first predetermined angle α1 is selected from a numerical range of about 30 to about 80 degrees, and the second predetermined angle α2 is about It is also possible to select from the range of 60 to about 90 degrees.

DESCRIPTION OF SYMBOLS 100 Air conditioning apparatus 10 Outdoor unit 20 Indoor unit 30 Casing 31a-31d Outlet port 32 Inlet port 33a-33d Horizontal flap 40 Panel 41 Central member 41a Reference surface (lower surface) of central member
41b Central member side surface 41c Central member upper surface 42 Suction opening 43 Annular member 43a Annular member lower surface 43b Annular member side surface 46 Auxiliary opening 46a Auxiliary opening forming surface 50 Fan 60 Indoor heat exchanger 70 Filter

JP 2011-27336 A

Claims (8)

A ceiling-embedded indoor unit,
A casing (30) having an opening (32) for inhaling air formed in the lower surface;
A panel located near the opening (32) and having a central member (41) positioned substantially in the center of the opening when viewed from the vertical direction and an annular suction opening (42) surrounding the central member. (40)
A fan (50) located inside the casing;
With
The fan (50) generates an air flow toward the fan through the suction opening, and is located on the downstream side of the air flow from the panel.
An auxiliary opening (46) is formed in the central member (41).
A ceiling-embedded indoor unit (20). The auxiliary opening (46) is formed in a cross shape when the panel is viewed from the vertical direction.
The ceiling-embedded indoor unit (20) according to claim 1. The air flow is a flow such that air approaches the central side of the central member as it goes from the suction opening to the fan.
The ceiling-embedded indoor unit (20) according to claim 1 or 2. The central member (41)
The reference surface (41a) which is the lower surface is substantially horizontal,
A side surface (41b) extending upward from the periphery of the reference surface is inclined at a first predetermined angle (α1) with respect to the reference surface (41a),
A formation surface (46a) that forms the auxiliary opening (46) by extending upward from the reference surface of the central member is inclined at a second predetermined angle (α2) with respect to the reference surface (41a). ,
The first predetermined angle (α1) is smaller than the second predetermined angle (α2).
The ceiling-embedded indoor unit (20) according to claim 3. The width (w2) of the suction opening (42) is larger than the width (w1) of the auxiliary opening (46),
The ceiling-embedded indoor unit (20) according to any one of claims 1 to 4. The width (w4) of the suction opening on the upper surface side of the panel (40) is larger than the width (w5) of the suction opening on the lower surface side of the panel (40).
The ceiling-embedded indoor unit (20) according to any one of claims 1 to 5. The upper surface (41c) of the central member (41) protrudes upward and is curved.
The ceiling-embedded indoor unit (20) according to any one of claims 1 to 6. The panel (41) has a hollow interior.
The ceiling-embedded indoor unit (20) according to any one of claims 1 to 7.