JP2016186373A - Ceiling embedded type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress wind whistle generated in a heat exchanger.SOLUTION: A straightening plate 140 is installed on a side close to a top plate 12 of an area 60A in which an angle between a wind direction vector V of an air flow blown off from a tangential direction of an outer periphery 50a of a turbo fan 50 and flowing in a fin 61 of a heat exchanger 60 and a line L3 orthogonal to a surface 61a of the fin 61 is less than 30 degrees. The straightening plate 140 is equipped with blades 143, 144, and 145 aligned and disposed in a rotating direction of the turbo fan in parallel with a rotary center of the turbo fan 50. The blades 143-145 are formed so as to gradually increase height from an inner surface of the heat exchanger 70, from an upstream to a downstream of the air flow blown off from the turbo fan 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a ceiling-embedded air conditioner that is embedded in a ceiling of a room, and more particularly to a ceiling-embedded air conditioner that suppresses wind noise generated in a heat exchanger.

  The ceiling-embedded air conditioner is generally configured as shown in FIGS. Reference numeral 10 denotes a substantially rectangular parallelepiped housing made of sheet metal, the upper surface of which is closed by a top plate 11, the side surface of which is closed by a side plate 12, and the lower surface is opened. The casing 10 has a heat insulating sheet 20 </ b> A attached to the back surface of the top plate 11 and a heat insulating sheet 20 </ b> B attached to the back surface of the side plate 12. And the hook 30 attached to the outer side of the corner | angular part 12a of the side plate 12 is suspended by the beam etc. of a ceiling with a suspension metal fitting.

  A motor 40 is attached to the center of the back surface of the top plate 11 of the housing 10, and a turbo fan 50 as a centrifugal blower is coupled to an output shaft 41 of the motor 40. Reference numeral 60 denotes a heat exchanger having a substantially rectangular tube shape when viewed from the lower surface. 70 is a drain pan made of foamed resin, which collects the dew condensation water generated in the heat exchanger 60 and sends it to a drain pipe (not shown).

  Reference numeral 80 denotes a decorative panel in which an air suction port 81 is provided in the central portion and air outlets 82 are provided at four locations around the air suction port 81. A bell mouth 90 guides the air sucked from the air suction port 81 of the decorative panel 80 to the turbofan 50.

  Reference numeral 100 denotes an air blowing guide that guides the air that has passed through the heat exchanger 60 to the air outlet 82, and reference numeral 110 denotes a dust removal filter disposed inside the air suction port 81 of the decorative panel 80. Reference numeral 120 denotes an electrical component box that controls various electrical components including the motor 40, and is incorporated between the lower surface of the drain pan 70 and the upper surface of the decorative panel 80. 130 is an indoor ceiling board in which a ceiling-embedded air conditioner is arranged.

  In such a ceiling-embedded air conditioner, the turbo fan 50 and the heat exchanger 60 are close to each other when the size is reduced. For this reason, when the airflow generated from the blades of the turbofan 50 flows between the fins of the heat exchanger 60, the wind pressure when hitting the fins from a substantially perpendicular direction becomes strong, and a wind noise is generated.

  Therefore, conventionally, as shown in FIG. 9, the rectifying plate 160 is attached to the top plate 11 near the center of each side of the inner surface of the heat exchanger 60. The heat exchanger 60 is mounted upside down when it is mounted on the ceiling-embedded air conditioner shown in FIG. The rectifying plate 160 includes a lower plate 161, an upper plate 162, and blade plates 163 to 165. An engaging claw 163 a is provided on the upper portion of the blade plate 163, and an engaging claw 165 a is provided on the lower portion of the blade plate 165. . The attachment is performed by engaging the engaging claws 163a and 165a with the refrigerant pipe on the side close to the top plate 11 of the heat exchanger 60. Thereby, suppression of the generation of wind noise generated in the heat exchanger 60 has been performed (for example, Patent Document 1). Patent Document 2 describes that a rectifying plate composed of a single blade is attached.

JP 2001-099436 A JP 2014-129994 A

  However, since the inclination of the wind direction vector of the airflow blown from the turbofan 50 to the heat exchanger 60 varies depending on the positional relationship between the turbofan 50 and the heat exchanger 50, the conventional rectifying plate 160 and its arrangement are used. The wind noise generated in the heat exchanger 60 could not be effectively suppressed.

  An object of the present invention is to provide a ceiling-embedded air conditioner that can effectively suppress wind noise generated in a heat exchanger.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an upper surface is closed by a top plate, a side surface is closed by a side plate, and a lower surface is opened, and an air suction port is provided in the center. A decorative panel which is provided with an air outlet around and is attached to the lower surface of the housing, a motor which is attached to the top plate of the housing, and a centrifugal which blows off air sucked from the inner surface driven by the motor and sucked from the inner surface A blower, a bell mouth that guides air sucked from the air suction port to the inner surface of the centrifugal blower, and a plurality of plate-like fins face each other with a predetermined interval between each fin. A heat exchanger arranged so that an air flow blown from the outer periphery of the centrifugal blower flows into the drain pan, a drain pan for collecting condensed water generated in the heat exchanger, and the heat exchange A noise-reducing rectifier plate mounted on a surface that receives the air flow, wherein the rectifier plate is blown out in a tangential direction of the outer periphery of the centrifugal blower and the heat The airflow direction vector of the airflow flowing into the fin of the exchanger and the angle between the line perpendicular to the surface of the fin are mounted on the side close to the top plate in an area of less than 30 degrees.

  The invention according to claim 2 is the ceiling-embedded air conditioner according to claim 1, wherein the current plate includes a plurality of blades arranged in parallel to the fins of the heat exchanger, The plurality of blades are formed such that the height from the inner surface of the heat exchanger increases sequentially from upstream to downstream of the air flow blown from the centrifugal blower.

  According to a third aspect of the present invention, in the ceiling-embedded air conditioner according to the second aspect, the plurality of blades of the rectifying plate have tip ends inclined in the upstream direction. To do.

  According to a fourth aspect of the present invention, in the ceiling-embedded air conditioner according to the third aspect, the plurality of blades of the rectifying plate causes an air flow blown out of the centrifugal blower to the air flow of the heat exchanger. It is curved to guide in the direction of the fin.

  According to the present invention, the top plate in a region where an angle between a wind direction vector of an air flow blown in a tangential direction of the outer periphery of the centrifugal blower and flowing into the fins of the heat exchanger and a line orthogonal to the plane of the fins is less than 30 degrees. Since the air flow is rectified into a flow along the direction of the fin surface of the heat exchanger on the side close to, noise in that portion can be effectively suppressed. Further, by making the height of the upstream blades of the wind from the centrifugal blower lower than the height of the downstream blades, new noise generation on the upstream side can be prevented. Moreover, the ventilation resistance in a baffle plate can be made small by inclining or curving these blades to an upstream direction.

It is explanatory drawing of the mechanism of the noise generation in a heat exchanger. It is a perspective view of the baffle plate of the Example of this invention. It is a cross-sectional view of the baffle plate of the Example of this invention. It is attachment explanatory drawing of the baffle plate of the Example of this invention. It is a bottom view of the ceiling embedded type air conditioner which attached the baffle plate of the Example of this invention, and removed the bell mouth, the drain pan, and the decorative panel. It is the perspective view seen from the lower surface of the ceiling embedded type air conditioner which attached the baffle plate of the Example of this invention, and removed the bell mouth and the decorative panel. It is the perspective view seen from the lower surface of the conventional ceiling-embedded air conditioner. It is a longitudinal cross-sectional view of a conventional ceiling-embedded air conditioner. It is the perspective view which attached the baffle plate to the conventional heat exchanger.

  Examples of the present invention will be described below. In addition, the same code | symbol was attached | subjected to the same thing as what was demonstrated in FIG. 7, FIG.

  When the air flow generated by rotating the blades 51 of the turbo fan 50 that is a centrifugal blower in the direction indicated by the arrow X is directed to the fins 61 of the inner surface 60B of the heat exchanger 60, the inventor Heat exchange is performed at any angle θ1 between the wind direction vector V of the air flow blown in the tangential direction of the outer periphery 50a and flowing into the fin 61 of the heat exchanger 60 and the line L3 orthogonal to the surface 61a of the fin 61. It was examined by experiment whether the noise generated in the vessel 60 increased. The heat exchanger 60 faces the surfaces 61a of the plurality of plate-like fins 61 with a predetermined gap therebetween, and an air flow blown from the outer periphery 50a of the turbofan 50 flows between the fins 61. To be arranged.

  According to this experiment, as shown in FIG. 1, the angle θ1 between the wind direction vector V and the line L3 is in the region 60A of the heat exchanger 60 where the angle is less than 30 degrees, and on the side close to the top plate 11 where the wind speed is high. It was confirmed that a loud noise was generated.

  This is considered because the inflow angle of the wind direction vector V with respect to the surface 61a of the fin 61 of the heat exchanger 60 approaches a right angle. However, it was also confirmed that no loud noise was generated in a region far from the turbofan 50 even in a region where the angle θ1 between the wind direction vector V and the line L3 was less than 30 degrees. This is considered to be because the air flow becomes weak and the wind direction vector V becomes small in such a remote area.

  Therefore, in the present invention, on the inner surface 60B of the heat exchanger 60, the angle θ1 between the wind direction vector V blown in the tangential direction of the outer surface 50a of the turbofan 50 on the side close to the top plate 11 and the line L3 is less than 30 degrees. It is assumed that the current plate 140 created by resin molding is attached to the region 60A.

  2 and 3, the rectifying plate 140 includes a lower plate 141 attached to the side facing the decorative panel 80 when attached to the heat exchanger 60, an upper plate 142 attached to the side facing the top plate 11, Three blade plates 143, 144, 145 are arranged so as to connect the lower plate 141 and the upper plate 142. The length of the blades 143 to 145 (the length in the vertical direction in FIG. 2) is about half of the height of the heat exchanger 60. On the outer surface (lower surface) of the lower plate 141, a triangular alignment mark 141a having a vertex 141a1 is formed in a concave shape. Note that no mark is formed on the outer surface (upper surface) of the upper plate 142. Further, an engagement claw 143a is formed at the center of the back end surface of the blade plate 143 at one end, and engagement claws 145a and 145b are formed at two locations above and below the back end surface of the blade plate 145 at the other end. ing.

  As shown in FIG. 3, the height H1 of the blade plate 143, the height H2 of the blade plate 144, and the height H3 of the blade plate 145 are set in a relationship of H1 <H2 <H3. The relationship between the distance L1 between the blades 143 and 144 and the distance L2 between the blades 144 and 145 is set to L1 <L2. Further, the blade plates 143 to 145 are inclined in the direction toward the upstream side in the rotational direction X of the turbofan 50 at the tip side (the lower side in FIG. 3) and are curved in that direction. That is, the blades 143 to 145 are shaped to receive the wind from the turbofan 50 and rectify the flow along the surfaces of the fins 61 of the heat exchanger 60.

  FIG. 4 is a diagram showing attachment of the rectifying plate 140. Reference numeral 150 denotes a positioning mark indicating the mounting position and the direction of the wind direction plate 140, which is formed in a concave shape by embossing on the lower surface of the heat insulating sheet 20 </ b> A attached to the back surface of the top plate 11 of the housing 10. Is located so as to be closer to the most upstream side (lower side in FIG. 4) of the region 60A.

  The positioning mark 150 includes a shape mark portion 151 representing the shape and mounting direction of the rectifying plate 140, and an alignment mark portion 152 having the same triangle as the alignment mark 141a of the rectifying plate 140 and having a vertex 152a. Yes.

  The shape mark portion 151 corresponds to a length obtained by adding the above-described distances L1 and L2 of the rectifying plate 140, and a base piece 151a disposed substantially parallel to the heat exchanger 60, and the rotation of the turbo fan 50 in the base piece 151a. A long piece 151b extending from the downstream end in the direction X in the opposite direction to the heat exchanger 60 and toward the oblique upstream side in the rotational direction X, and the long piece 151b from the upstream end in the rotational direction X of the base piece 151a It consists of a short piece 151c extending in the same oblique direction as the piece 151b, and a middle piece 151d between the long piece 151b and the short piece 151c.

  The alignment mark 152 is arranged on the opposite side to the side where the long piece 151b, the short piece 151c, the middle piece 151d and the like are arranged in the base piece 151a of the shape mark portion 151, that is, on the heat exchanger 60 side.

  The rectifying plate 140 is attached to the heat exchanger 60 by positioning the rectifying plate 140 on the inner surface 60B of the heat exchanger 60 after adjusting the orientation of the rectifying plate 140 to the direction of the positioning mark 151. Then, after performing alignment so that the vertex 141a1 of the triangular alignment mark 141a of the rectifying plate 140 is closest to the vertex 152a of the triangular alignment mark portion 152 of the positioning mark 150, the engaging claws 143a, 145 a and 145 b are engaged with the refrigerant pipe 62 of the heat exchanger 60.

  Thereby, as shown in FIGS. 5 and 6, the rectifying plate 140 is in a state where the blade plates 143 to 145 are arranged in parallel to the rotation center of the turbo fan 50 and in the rotation direction of the turbo fan 50. The inner surface 60B of the region 60A is attached to the side closer to the back surface of the top plate 11. In FIG. 5, reference numeral 63 denotes a heat exchanger attachment for attaching the heat exchanger 60 to the top plate 11.

  As a result, the inner surface of the heat exchanger 60 in which the angle θ1 between the wind direction vector V of the air flow blown in the tangential direction of the outer periphery 50a of the turbo fan 50 and the line L3 orthogonal to the fin 61 is less than 30 degrees. In the region 60A of 60B, the airflow blown to the fin 61 is rectified by the blades 143 to 145 of the rectifying plate 140 at an angle close to parallel to the surface 61a of the fin 61, so that noise generation is effective. Can be suppressed.

  At this time, the blade plates 143 to 145 have a height that is lower such that H1 <H2 <H3 as the rectifying plate 140 is closer to the turbo fan 50, that is, the airflow blown from the turbo fan 50 is stronger. Since the height of the slats is lower, noise generated by the slats 143 to 145 themselves can be avoided. Further, since the blades 143 to 145 receive the wind in the wind intrusion direction, that is, are inclined and curved so as to take in the wind, the resistance to the air flow is reduced to reduce the fins 61 of the heat exchanger 60. Can be sent to. Further, since the distance L2 between the blades 144 and 145 is larger than the distance L1 between the blades 143 and 144, the air θ becomes relatively weak when the angle θ1 between the wind direction vector V and the line L3 is 30 degrees or more. The rectifying resistance portion with respect to the flow is only the blade 145, and a decrease in the intake efficiency of the weak air flow can be suppressed.

  Moreover, since the positioning mark 150 attached | subjected to the heat insulation sheet 20A of the back surface of the top plate 12 is provided with the shape mark part 151 showing the shape and direction of the baffle plate 140 so that the attachment position of the baffle plate 140 may be shown, a baffle plate At the time of mounting 140, it is only necessary to match the direction of the rectifying plate 140 to the shape mark portion 151, and it is possible to prevent the rectifying plate 140 from being mounted in an incorrect direction. Further, since the shape of the rectifying plate 140 can be known in advance by the shape mark portion 151, it is easy to select the rectifying plate 140 to be attached from the component box, and the workability is improved. Further, since the alignment mark 141a is attached only to the lower surface of the lower plate 141 of the rectifying plate 140 and the upper plate 142, the lower plate 141 and the upper plate 142 of the rectifying plate 140 are attached with the vertical relationship wrong. Can be prevented. Further, when the alignment mark 141a having the vertex 141a1 is provided on the current plate 140, the alignment mark portion 152 having the same shape having the vertex 152a is attached to the heat insulating sheet 20A, and when the current plate 140 is mounted, the vertex 141a1 is attached. And the apex 152a are made to face each other, so that the rectifying plate 140 can be easily mounted at the regular mounting position, and the effect of suppressing wind noise by the rectifying plate 140 can be sufficiently exhibited.

10: housing, 11: top plate 11: side plate 20A, 20B: heat insulating sheet 30: hook 40: motor, 41: output shaft 50: turbo fan, 51: blade, 50a: outer periphery 60: heat exchanger, 60A: area , 60B: inner surface, 61: fin, 61a: surface, 62: refrigerant piping, 63: heat exchanger fitting 70: drain pan 80: decorative panel, 81: air inlet, 82: air outlet 90: bellmouth 100: Air blow guide 110: Filter 120: Electrical component box 130: Indoor ceiling board 140: Rectification board, 141: Lower board, 141a: Position alignment mark, 142: Upper board, 143-145: Blade board, 143a, 145a, 145b: Person Joint claw 150: Positioning mark, 151: Shape mark part, 152: Positioning mark part

Claims (4)

A case where the upper surface is closed by the top plate, the side surface is closed by the side plate, and the lower surface is opened, and an air inlet is provided in the center, and an air outlet is provided around the air inlet and is attached to the lower surface of the case A decorative panel, a motor attached to the top plate of the housing, a centrifugal fan that is driven by the motor and blows air sucked from the inner surface from the outer periphery, and air sucked from the air suction port of the centrifugal fan. The bell mouth that guides to the inner surface and the surfaces of the plurality of plate-like fins face each other with a predetermined interval, and an air flow blown from the outer periphery of the centrifugal blower flows between the fins. A heat exchanger arranged so as to perform the operation, a drain pan for collecting dew condensation water generated in the heat exchanger, and a noise suppression device mounted on a surface of the heat exchanger that receives the air flow. In a ceiling embedded air conditioner having a plate, a
The rectifying plate is an area in which an angle between a wind direction vector of an air flow blown in a tangential direction of the outer periphery of the centrifugal blower and flowing into the fin of the heat exchanger and a line orthogonal to the surface of the fin is less than 30 degrees The ceiling-embedded air conditioner is mounted on the side close to the top plate. The ceiling-embedded air conditioner according to claim 1,
The rectifying plate includes a plurality of blades arranged in parallel with the fins of the heat exchanger, and the plurality of blades are arranged from upstream to downstream of the air flow blown from the centrifugal blower. The ceiling-embedded air conditioner is characterized in that the height from the inner surface of the heat exchanger is sequentially increased. The ceiling-embedded air conditioner according to claim 2,
The ceiling-embedded air conditioner characterized in that the plurality of blades of the rectifying plate have tips inclined toward the upstream direction. The ceiling-embedded air conditioner according to claim 3,
The plurality of blades of the rectifying plate are curved so as to guide an air flow blown from the centrifugal blower toward the fins of the heat exchanger. Harmony machine.

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