JP2017133715A - Ceiling-embedded air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling-embedded air conditioner in which a parting line PL capable of becoming an inner surface of a bell mouth 7 does not become a draft resistance.SOLUTION: A turbofan 6 and a bell mouth 7 are arranged in a body unit installed in a ceiling. The bell mouth 7 includes a suction guide part 72 gradually contracting its diameter toward the turbofan 6 and formed into a trumpet shape, and an enlarged diameter part 73 continuously formed to the suction guide part 72 and gradually enlarging its diameter. On a parting line PL provided on an inner surface of the bell mouth 7 and on a boundary between the suction guide part 72 and the enlarged diameter part 73, provided is a step part 75 in which the enlarged diameter part 73 is more recessed to outside than the suction guide part 72.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a ceiling-embedded air conditioner, and more particularly to the shape of a bell mouth.

  The ceiling-embedded air conditioner has a main body unit having a rectangular parallelepiped shape installed in the ceiling, and has an air suction port and an air outlet on the bottom surface of the main body unit, 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 main unit, 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 inlet and the turbofan.

  The bellmouth is continuous to the mounting base having an outer shape that matches the shape of the air suction port, the suction guide formed in a trumpet shape that gradually decreases in diameter from the center of the mounting base toward the turbofan, and the suction guide. And a diameter-expanding portion which is located inside the shroud of the turbofan and gradually increases in diameter along the shroud. The air taken into the main unit from the air suction port is guided to the turbofan through the air suction passage extending from the suction guide portion inside the bell mouth to the enlarged diameter portion.

  By the way, in the case of the resin bell mouth 100, as shown in FIG. 5, the boundary between the suction guide portion 101 gradually reduced in diameter and the enlarged diameter portion 102 gradually increased in diameter is a die joint 103 (parting line). When the mold is displaced during molding and a step 105 is generated in which the enlarged diameter portion 102 protrudes from the suction guide portion 101 into the air suction passage 104, the step 105 becomes a ventilation resistance and the turbo fan is difficult to suck in air. The load on the fan increases.

JP 2000-213800 A (FIG. 1)

  Then, the subject of this invention is providing the ceiling embedded type air conditioner which prevents the fall of ventilation efficiency by preventing the parting line made in the inner surface of a bell mouth from becoming resistance of suction air.

  In order to solve the above-described problems, the present invention has a turbofan and a bell mouth arranged in a main body unit installed in a ceiling, and the bell mouth is formed in a trumpet shape that gradually decreases in diameter toward the turbo fan. A suction guide portion, and a diameter-increasing portion that is formed continuously from the suction guide portion and gradually increases in diameter, and a parting line is formed at the boundary between the suction guide portion and the diameter-expanded portion on the inner surface of the bell mouth. The ceiling-embedded air conditioner includes a stepped portion in which the enlarged diameter portion is recessed outward from the suction guide portion on the parting line.

  In addition, the depth D of the step portion includes 0 mm <D ≦ 0.2 mm.

  According to the present invention, it is possible to prevent a reduction in ventilation efficiency by providing a step on the parting line so that the parting line formed on the inner surface of the bell mouth does not become the resistance of the intake air.

The perspective view of the ceiling embedded type air conditioner of this invention. The longitudinal cross-sectional view of the ceiling-embedded air conditioner of this invention. The perspective view of the bellmouth of this invention. The X section enlarged view of FIG. The partial enlarged view of the conventional bellmouth.

  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 and 2, the ceiling-embedded air conditioner 1 (hereinafter referred to as an air conditioner) includes a main unit 10. The main body unit 10 includes a top plate 13 formed of a sheet metal having a substantially octagonal shape with four sides of a square as a long side and four sides of the square chamfered as a short side, and an outer periphery of the top plate 13. An outer shell is formed by the side plate 11 extending downward. To the side plate 11, hanging metal fittings 12 are fixed to four locations of the side plate 11 a located along the short side of the top plate 13. The main unit 10 is installed in the ceiling T by suspending the suspension fitting 12 with a plurality of suspension bolts embedded in a ceiling back wall (not shown).

  In the coordinate axes along the main unit 10 in FIG. 2, the Y direction is described as an upper surface or an upper side, and the −Y direction is described as a lower surface or a lower side. The same applies to each part.

  In the center of the main unit 10, an air suction passage 16 that guides air in the air-conditioning chamber K to a turbo fan 6 described later is formed, and an air outlet passage 17 is formed between a heat exchanger 25 described later and the outlet 31. Has been.

  A decorative panel 30 is attached to the hanging metal fitting 12 with screws on the bottom surface 101 of the main unit 10. The decorative panel 30 is provided with a rectangular suction grill 32 having a plurality of suction holes 321 communicating with the air suction passage 16 of the main unit 10 at the center. A dust removal filter 322 is provided on the air suction passage 16 side of the suction hole 321 of the suction grill 32. Around the suction grill 32, rectangular air outlets 31 are arranged at four locations along each side of the suction grill 32. The air outlet 31 communicates with the air outlet passage 17.

  Each air outlet 31 is provided with a wind direction plate 33. The wind direction plate 33 is opened at a predetermined angle when the air conditioner 1 is operated by a rotating means (not shown).

  An inner box 14 made of a heat insulating material is provided on the inner peripheral surfaces of the top plate 13 and the side plate 11 of the main unit 10. A fan motor 21 is fixed to the inside of the center of the top plate 13 with screws, and a hub 61 of the turbo fan 6 is pivotally supported on a shaft 22 extending downward from the fan motor 21. The turbo fan 6 includes a hub 61, a shroud 63, and a plurality of blades 62 sandwiched between the hub 61 and the shroud 63. An opening 64 is provided at the center of the shroud 63.

  Around the turbo fan 6, a heat exchanger 25 is arranged in a square frame shape so as to surround the turbo fan 6. The heat exchanger 25 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 25 functions as an evaporator to cool indoor air and perform heating operation. Sometimes it functions as a condenser to heat room air.

  A drain pan 19 is provided on the lower end side of the heat exchanger 25 to receive the dew condensation water generated by the heat exchanger 25. The drain pan 19 has a flange portion 191 in which the lower end side of the heat exchanger 25 is accommodated. Condensed water dripping from the heat exchanger 25 is received by the flange portion 191 and is pumped up by, for example, a drain pump (not shown) and drained outside the room. Is done.

  A central portion of the drain pan 19 is opened and serves as a suction port 15. A bell mouth 7 that connects the suction port 15 and the turbofan 6 is disposed in the suction port 15. Further, an electrical component box 18 formed in an L shape is disposed on the suction mouth 15 side of the bell mouth 7 so as not to obstruct air passing through the suction mouth 15. An electrical component (not shown) for controlling the air conditioner 1 is accommodated in the electrical component box 18.

  The air sucked from the suction hole 321 of the decorative panel 30 by the turbo fan 6 driven to rotate by the fan motor 21 is sucked into the main body unit 10 from the suction port 15, and the inner surface of the bell mouth 7 serving as the air suction passage 16. Are guided to the turbo fan 6 and blown out from between the hub 61 and the shroud 63 of the turbo fan 6 toward the outer peripheral direction.

  Referring also to FIG. 3, the bell mouth 7 is made of resin (high impact polystyrene), and has a mounting base 71 formed in a square shape in accordance with the shape of the suction port 15, and a central portion of the mounting base 71. A suction guide portion 72 formed in a trumpet shape that gradually decreases in diameter toward the turbofan 5 and a diameter-increasing portion 73 that is formed continuously from the suction guide portion 72 and that gradually increases in diameter. The enlarged diameter portion 73 is located inside the opening 64 of the shroud 63 of the turbofan 6. The diameter-expanded portion 73 has a shape that gradually increases in diameter along the shape of the shroud 63, so that the air guided from the suction guide portion 72 is smoothly guided to the shroud 63 along the surface of the diameter-expanded portion 73. Will improve.

   A housing portion 74 for arranging the electrical component box 18 is formed in a part of the mounting base portion 71 of the bell mouth 7. The storage portion 74 is recessed in such a manner that a part of the mounting base portion 71 is directed inward of the main body unit 10, and is formed in an L shape in accordance with the shape of the electrical component box 18.

  Next, referring to FIG. 4, when the bell mouth 7 is formed, the joint between the upper and lower molds (hereinafter referred to as parting) is formed at the boundary between the suction guide portion 72 that gradually decreases in diameter and the enlarged diameter portion 73 that gradually increases in diameter. PL).

  In this parting PL, in order to prevent the suction guide portion 72 from protruding into the air suction passage 16 from the enlarged diameter portion 73 due to the deviation of the mold, the deviation of the mold is taken into consideration on the parting line PL in advance. A stepped portion 75 in which the enlarged diameter portion 73 is recessed outward from the suction guide portion 72 is provided. The step portion 75 is provided so as to go around the inner surface of the bell mouth 7 along the parting line PL.

  Further, the depth (step) D of the step portion 75 is set so as to satisfy 0 mm <D ≦ 0.2 mm.

  By providing the step 75 on the parting line PL on the inner surface of the bell mouth 7, the air flowing through the air suction passage 16 is ventilated by the parting line PL being guided to the shroud 63 without becoming the resistance of the suction air. A reduction in efficiency can be prevented.

  The wall thickness 7a of the bell mouth 7 is approximately 2.0 mm. However, by setting the depth D of the stepped portion 75 to 0 mm <D ≦ 0.2 mm, the wall thickness 73a of the enlarged-diameter portion 73 is the other portion. It does not affect the strength without being particularly thin.

  As described above, according to the present invention, the air suction passage is provided by providing the stepped portion 75 in which the enlarged diameter portion 73 is recessed outside the suction guide portion 72 on the parting line PL on the inner surface of the bell mouth 7. The air flowing through 16 passes through the stepped portion 75 without resistance from the suction guide portion 72 and is smoothly guided to the shroud 63 along the surface of the enlarged-diameter portion 73, thereby preventing a reduction in ventilation efficiency. An air conditioner can be provided.

1: ceiling-embedded air conditioner, 10: main unit, 15: suction port, 16: air suction passage 30: decorative panel, 32: suction grille, 321: suction hole 6: turbo fan, 63: shroud, 64: Opening part 7: Bell mouth, 71: Mounting base, 72: Suction guide part, 73: Expanded diameter part, 74: Storage part, 75: Step part K: Air conditioning room, PL: Parting line, D: Depth

Claims (2)

A turbo fan and a bell mouth are arranged in a main body unit installed in the ceiling, and the bell mouth is formed in a trumpet-shaped suction guide portion that gradually decreases in diameter toward the turbo fan, and the suction guide portion. In a ceiling-embedded air conditioner having a diameter-enlarged portion that is continuously formed and gradually expands in diameter, and has a parting line at the boundary between the suction guide portion and the diameter-expanded portion on the inner surface of the bell mouth,
A ceiling-embedded air conditioner in which a step portion in which the enlarged diameter portion is recessed outward from the suction guide portion is provided on the parting line.   The depth D of the stepped portion satisfies 0 mm <D ≦ 0.2 mm, and the ceiling-embedded air conditioner according to claim 1.

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