JP2017058076A - Ceiling embedded type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling embedded type air conditioner that inhibits a swirl flow from entering a narrow space between a bottom part of a box storage part of an electric article and a turbo fan and suppresses a blowout loss while preventing noise generation, thereby providing further high-heat exchange efficiency.SOLUTION: A wind shield plate 76 is provided in part of a rear face of a bottom part 731 of a storage part 73 of an electric article box 9 of a bell mouth 7 to inhibit the swirl flow from entering a space G formed between the bottom part 731 of the electric article box storage part 73 and the turbo fan 5.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a ceiling-embedded air conditioner, and more specifically to a ceiling-embedded air conditioner that suppresses a swirling flow generated on the back surface of a bell mouth.

  A ceiling-embedded air conditioner has a rectangular parallelepiped casing body embedded in a space formed between a ceiling slab and a ceiling panel, and an air inlet and an air outlet on the bottom surface of the casing body And a decorative panel is attached.

  Usually, an air suction inlet is arrange | positioned in the center of a decorative panel, and the air blower outlet which makes a rectangular shape around it is arrange | positioned. Further, a suction grille having a dust removal filter is provided at the air suction port of the decorative panel.

  In the casing main body, a turbo fan as a blower is disposed at the center thereof, and a heat exchanger is disposed so as to surround the turbo fan. A bell mouth is provided between the air suction port and the turbo fan to guide the air taken into the casing body from the air suction port to the turbo fan.

  The bell mouth includes an attachment base portion having an outer shape that matches the shape of the air suction port, and a suction guide portion formed in a trumpet shape that gradually decreases in diameter from the center of the attachment base portion toward the turbofan.

  By the way, a part of the sucked air may flow to the back surface (back side) of the bell mouth from a gap formed between the suction guide portion of the bell mouth and the turbofan.

  Then, a so-called swirling flow is generated in which the air staying on the back side of the bell mouth swirls along the back side of the bell mouth as the turbo fan rotates. When the swirl flow is generated, noise is generated and not only the turbo fan is prevented from rotating stably, but also the amount of air flowing to the heat exchanger is reduced, and accordingly, the air flow is deteriorated and the heat exchange efficiency is lowered. To do.

  Therefore, in order to improve the decrease in heat exchange efficiency due to the swirling flow, in Patent Document 1, the wall portion extending along the radial direction of the turbofan is erected at a predetermined interval on the back side of the bell mouth. The flow is blocked by the wall to prevent the swirl flow from occurring.

  On the other hand, in the invention described in Patent Document 2, a storage portion that is recessed toward the inside of the casing body with a size corresponding to the electrical component box is formed in a part on the air suction surface side of the mounting base portion of the bell mouth. In addition, an electrical component box in which electrical components are stored is mounted in the storage unit.

  However, the storage portion of this electrical component box has a bottom rear surface protruding in the casing body so that the space between the turbo fan and the other portion is narrower than other portions.

  Therefore, noise may be generated when the swirling flow flows into the narrow space. In particular, in a ceiling-embedded air conditioner that is thin overall, the space between the bottom back side of the storage part of the electrical component box and the turbofan is also narrowed, so that it is like a whistling sound. Large noise is likely to occur.

JP 2013-36444 A JP 2003-74900 A

  Therefore, the problem of the present invention is to make it difficult for the swirling flow generated on the back side of the bell mouth to flow into the space between the bottom part of the storage part of the electrical component box and the turbofan, while suppressing the generation of noise. An object is to provide a ceiling-embedded air conditioner having high heat exchange efficiency.

  In order to solve the above-described problems, the present invention includes a casing body embedded in a ceiling, and a decorative panel attached to the bottom surface of the casing body and having an air suction port in the center. Is provided with a turbo fan, a heat exchanger disposed around the turbo fan, a bell mouth, and an electrical component box, and the bell mouth is formed in accordance with the shape of the air inlet. A mounting base attached to the bottom surface side of the casing body, a suction guide part formed in a trumpet shape that gradually decreases in diameter from the center of the mounting base toward the turbofan, and recessed in a part of the mounting base. In the ceiling-embedded air conditioner having a storage part for the electrical component box and the electrical component box being mounted in the storage part, the back side of the bottom part of the storage part on the turbofan side is It is characterized in that the wind shield plate suppresses flowing into the back surface side of the bottom portion of the swirling flow generated in the rear surface of the bell mouth by the rotation of the turbofan is provided.

  In the present invention, the wind shield plate is a thin projecting piece, and is disposed at both ends of the bottom portion on the back surface side.

  Further, the wind shield plate includes a first wind shield portion disposed at a height lower than the height of the space in a space between the back surface of the bottom portion and the turbofan, and an end of the first wind shield portion. A second wind-shielding portion whose height gradually increases from the portion toward the outer periphery of the bell mouth.

  Moreover, the aspect in which the baffle plate for suppressing generation | occurrence | production of the said turning flow is further provided in the part except the bottom part of the said accommodating part among the back surfaces of the said bell mouth is also contained in this invention.

  According to the present invention, in a ceiling-embedded air conditioner that has a storage part for an electrical component box recessed in a part of the mounting base of the bell mouth and places the electrical component box in the storage part, no noise is generated. At the same time, it is possible to provide a ceiling-embedded air conditioner that suppresses blowing loss and has higher heat exchange efficiency.

1 is a perspective view of a ceiling-embedded air conditioner according to an embodiment of the present invention. The perspective view of the casing main body of the ceiling-embedded air conditioner of FIG. Sectional drawing which shows the internal structure of the said casing main body. A perspective view showing the front side of the bell mouth (the surface facing the indoor side) and the electrical component box The perspective view which shows the back surface side (surface turned in a casing main body) of a bellmouth. The arrow line view seen from the Y direction of FIG. 5 which shows the state which attached the bell mouth to the turbo fan. The rear perspective view of a bell mouth explaining movement of a swirl flow.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  As shown in FIGS. 1 to 3, the ceiling-embedded air conditioner 1 includes a casing body 2 that is housed in a space formed between a ceiling slab and a ceiling panel. The casing body 2 includes a rectangular top plate 21 and four first to fourth side plates 22a to 22d extending downward from the respective sides of the top plate 21, and a bottom surface 20 (the bottom surface in FIG. 1). ) Is a rectangular parallelepiped box-shaped container opened.

  In this embodiment, four corners of the casing body 2 are chamfered, and a hanging metal fitting 25 for fixing a suspension bolt (not shown) is provided at the chamfered portion. An air suction passage 23 is formed at the center of the casing body 2, and an air blowing passage 24 is formed so as to surround the four sides of the air suction passage 23.

  On the bottom surface 20 of the casing body 2, the decorative panel 3 is attached to a hanging metal fitting 25 with screws. The decorative panel 3 has a rectangular air suction port 31 communicating with the air suction passage 23 of the casing body 2 in the center, and the suction grill 4 is provided so as to cover the air suction port 31. Around the air inlet 31, rectangular air outlets 32 are arranged at four locations along each side of the air inlet 31. The air outlet 32 communicates with the air outlet passage 24.

  Each air outlet 32 is provided with a vertical wind direction plate 321. The up / down wind direction plate 321 is opened at a predetermined angle during operation by a rotating means (not shown).

  Inside the casing body 2, a turbo fan 5 as a blower fan and a heat exchanger 6 are accommodated, and an air suction passage 23 extending from the air suction port 31 to the turbo fan 5 is connected to the air suction port 31. A bell mouth 7 is arranged to guide the sucked air to the turbo fan 5.

  The turbo fan 5 includes a fan motor 51 disposed substantially at the center of the top plate 21, a main plate 52 having a hub 521 fixed to the rotation shaft 511 of the fan motor 51, and the axial direction of the rotation shaft 511 with respect to the main plate 52. And a plurality of blades 54 disposed between the main plate 52 and the shroud 53. In the center of the shroud 53, an opening 531 for arranging the upper end 721 of the bell mouth 7 in the turbofan 5 is provided.

  According to the turbo fan 5, with the rotation of the fan motor 51, room air is sucked into the turbo fan 5 from the air suction port 31 through the bell mouth 7 and blown out toward the outer periphery by the blade 54.

  In this embodiment, the heat exchanger 6 is arranged in a square frame shape so as to surround the turbofan 5.

  The heat exchanger 6 is connected to an outdoor unit (not shown) having a reversible refrigeration cycle circuit capable of cooling operation and heating operation. During the cooling operation, the heat exchanger 6 functions as an evaporator to cool indoor air and perform heating operation. Sometimes it functions as a condenser to heat room air.

  On the lower end side of the heat exchanger 6, a drain pan 8 that receives the dew condensation water generated by the heat exchanger 6 is provided. The drain pan 8 has a flange 81 in which the lower end side of the heat exchanger 6 is accommodated. Condensed water dripping from the heat exchanger 6 is received by the flange 81, and, for example, is pumped up by a drain pump (not shown) and drained outside the room. Is done.

  Referring to FIG. 4, bell mouth 7 has a mounting base 71 formed in a square shape in accordance with the shape of air suction port 31, and a trumpet shape that gradually decreases in diameter from the central portion of mounting base 71 toward turbo fan 5. And a suction guide portion 72 formed on the surface. In this embodiment, the bell mouth 7 is screwed to the drain pan 8 by a screw hole 71 a of the mounting base 71.

  On the surface 7A of the bell mouth 7 (the surface facing the room and also the surface included in the bottom surface 20 of the case body 2), the electrical component box 9 is disposed on a part of the mounting base 71. A storage portion 73 is formed.

  The electrical component box 9 includes a box body 91 having an open upper surface in which a substrate and electrical components (both not shown) are accommodated, and a lid 92 detachably attached to the upper surface of the box body 91. In this embodiment, the box body 91 includes first and second storage boxes 91a and 91b, which are connected in an L shape so that they are orthogonal to each other.

  The storage portion 73 is recessed so that a part of the mounting base 71 is directed inward of the casing body 2, and the first storage portion 73 a in which the first storage box 91 a of the electrical component box 9 is stored, and the electrical component box 9 And a second storage portion 73b in which the second storage box 91b is stored, and is formed in an L shape in accordance with the shape of the electrical component box 9.

  5 and 6, as described above, as the storage portion 73 is recessed from the front surface 7A side of the bell mouth 7 to the inside of the case body 2, the back surface (back surface) of the bell mouth 7 is formed. ) On the 7B side, the bottom portion 731 of the storage portion 73 protrudes as a pedestal-shaped convex portion. Therefore, the space G between the rear surface of the bottom portion 731 and the lower end 532 of the shroud 53 of the turbofan 5 is smaller than the space F between the rear surface of the mounting base portion 71 not having the storage portion 73 and the lower end 532 of the shroud 53. They will face each other with a narrow interval.

  As described above, a part of the sucked air flows into the back surface 7B side of the bell mouth 7 from the gap S formed between the suction guide portion 72 of the bell mouth 7 and the turbo fan 5, and the turbo fan 5 Although the swirling flow C is generated along the back surface side of the suction guide portion 72 of the bell mouth 7 by the rotation, when the swirling flow C flows into the space G, a loud noise such as a whistling sound may be generated.

  Therefore, in the present invention, the wind shielding plate 76 for suppressing the inflow of the swirling flow C is provided in the narrow space G between the back surface of the bottom portion 731 and the lower end 532 of the shroud 53 of the turbofan 5. In this embodiment, the wind shield plate 76 is a thin projecting piece and is disposed at both ends 732 on the back surface side of the bottom portion 731 of the storage portion 73.

  The wind shields 76 are erected at two locations on the back surface end of the bottom portion 731 of the storage portion 73, and within the space G from the height H of the space G (distance between the lower end 532 and the bottom portion 731). A first wind shield 761 arranged with a lower height h, and a triangular second wind shield 762 that gradually increases in height from the end of the first wind shield 761 toward the outer periphery of the bell mouth 7. And. In addition, the height of the 2nd wind shield 762 should just be arrange | positioned so that it may not contact from the lower end 532 of the shroud 53 to the outer periphery.

  In this embodiment, the wind shield plate 76 is provided at both ends 732 of the bottom portion 731 of the storage portion 73, but at least the swirling flow flows into the wind shield plate 76 at both ends 732 of the bottom portion 731 of the storage portion 73. If it is provided at the upstream end 732a, most of the swirling flow entering the space G can be prevented.

  In this embodiment, as shown in FIG. 5, a rectifying plate 75 is provided on the back side of the suction guide portion 72 of the bell mouth 7 to suppress the generation of the swirling flow.

  The rectifying plate 75 includes a first rectifying side 751 extending vertically from the back surface 7B side of the mounting base 71 of the bell mouth 7 and horizontally extending from the upper end of the first rectifying side 751 toward the upper edge 721 of the suction guide portion 72. It is preferably formed in a plate shape having a second rectifying side 752 extending. In this embodiment, the rectifying plates 75 are provided at two positions at intervals of 90 ° on the portion excluding the bottom portion 731 of the storage portion 73 on the back surface 7B of the attachment base portion 71.

  Referring to FIG. 7, according to the configuration described above, the wind shield plate 76 prevents the swirling flow from flowing into the narrow space G between the back surface of the bottom portion 731 of the storage portion 73 and the shroud 53 of the turbofan 5. Therefore, the generation of loud noises such as whistling sounds is prevented.

  Further, by further providing the rectifying plate 75, the generation of the swirling flow is effectively suppressed, and even if the swirling flow is generated, the swirling flow is converted into the heat exchanger 6 by the rectifying plate 75 and the wind shield plate 76. Since the direction is changed to the side, airflow loss is reduced and heat exchange efficiency is increased.

  In this embodiment, the electrical component box 9 and the storage portion 73 are formed in an L shape. However, other than this, an I shape (straight shape) or a dogleg shape may be used. It is only necessary that a windshield plate 76 is provided on the back surface.

  As described above, according to the present invention, a ceiling-embedded air conditioner having a storage part for an electrical component box recessed in a part of the mounting base of the bell mouth and arranging the electrical component box in the storage part In this case, noise is generated by providing a windshield on the bottom back side of the storage part of the electrical component box to suppress the inflow of the swirl flow generated on the back side of the bell mouth by the rotation of the turbofan to the bottom back side. In addition, it is possible to provide a ceiling-embedded air conditioner that suppresses blowing loss and has higher heat exchange efficiency.

DESCRIPTION OF SYMBOLS 1 Ceiling embedded type air conditioner 2 Casing main body 21 Top plate 23 Air suction passage 24 Air blowout passage 3 Cosmetic panel 31 Air suction inlet 32 Air blowout outlet 4 Suction grill 5 Turbofan 6 Heat exchanger 7 Bellmouth 71 Mounting base 72 Suction guide portion 73 Storage portion 731 Bottom portion 75 Current plate 76 Wind shield plate 8 Drain pan 9 Electrical component box C Swirling flow G Space

Claims (4)

A casing body embedded in the ceiling; and a decorative panel attached to the bottom surface of the casing body and provided with an air suction port in the center. In the casing body, there are a turbo fan and around the turbo fan. The heat exchanger to be arranged, bellmouth, and electrical component box are arranged,
The bell mouth is formed in a trumpet shape that is formed in accordance with the shape of the air suction port and is attached to the bottom surface side of the casing body, and is gradually reduced in diameter from the center of the attachment base toward the turbo fan. In a ceiling-embedded air conditioner having a suction guide part and a storage part of the electrical component box recessed in a part of the mounting base, and the electrical component box is mounted on the storage part,
On the back surface side of the bottom portion of the storage portion on the turbo fan side, a wind shielding plate is provided to suppress inflow of the swirling flow generated on the back surface of the bell mouth due to the rotation of the turbo fan to the back surface side of the bottom portion. A ceiling-embedded air conditioner characterized by   2. The ceiling-embedded air conditioner according to claim 1, wherein the wind shield plate is a thin projecting piece and is disposed at both ends on the back side of the bottom portion.   The windshield plate includes a first wind shield portion disposed at a height lower than the height of the space in a space between the rear surface of the bottom portion and the turbofan, and an end portion of the first wind shield portion. 3. The ceiling-embedded air conditioner according to claim 2, further comprising a second wind shield portion that gradually increases in height toward the outer periphery of the bell mouth.   The flow regulating plate for suppressing generation | occurrence | production of the said swirl | vortex flow is further provided in the part except the bottom part of the said accommodating part among the back surfaces of the said bell mouth, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The ceiling-embedded air conditioner described in the item.

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