JP2823351B2 - Heat exchange unit - Google Patents

Description

The present invention relates to a heat exchange unit suitable for a ceiling-mounted or ceiling-suspended air-conditioning unit and the like.

(B) Conventional technology By surrounding the end of a centrifugal fan with a wind direction changer,
Japanese Patent Application Laid-Open No. 61-280327 discloses a heat exchange unit in which the distribution of the air velocity discharged from a centrifugal fan is made uniform to improve the heat exchange efficiency.

(C) Problems to be Solved by the Invention In the heat exchange unit proposed in the above publication, when the upper end of the heat exchanger is shifted upward from the centrifugal fan to increase the heat exchange capacity, the discharge discharged from the centrifugal fan is increased. Since the air does not flow to the upper end of the heat exchanger with the wind direction changer, heat is hardly exchanged at the upper end, and the heat exchange efficiency is reduced.

The present invention has been made in view of the above problems, and has as its object to provide a heat exchange unit that improves the heat exchange efficiency by guiding the air discharged from a centrifugal fan to the upper end of a heat exchanger.

(D) Means for Solving the Problems A heat exchange unit of the present invention includes a single-suction centrifugal fan including a side plate and a number of blades provided on the side plate,
A heat exchanger whose upper end is displaced upward from the peripheral end of the side plate in the discharge side ventilation path around the centrifugal fan, and is disposed between the peripheral end of the side plate and the upper end of the heat exchanger. And
An air flow guide that has an inclination from the upper end of the heat exchanger toward the peripheral end of the side plate and guides the air discharged from the centrifugal fan to the upper end of the heat exchanger.

(E) Function In the heat exchange unit of the present invention, the discharge air discharged from the one-suction centrifugal fan in all circumferential directions adheres to the wall surface of the airflow guide by the Coanda effect. Since it is guided to the upper end, heat exchange is effectively performed in the entire heat exchanger, and the discharged air is diffused substantially uniformly, so that collision with the heat exchanger is relieved and noise is suppressed.

(F) Example An example of the present invention will be described with reference to the drawings. The drawing is a cross-sectional view of a ceiling-embedded air-conditioning unit exemplified as a heat exchange unit. The unit body 2 is made of sheet metal and has a heat insulating material 1 stuck to an inner wall, a suction grill 3 in the center, and a peripheral part 4.
And a decorative panel 5 having an outlet 4 on the side.

Reference numeral 6 denotes a single-suction synthetic resin centrifugal fan called a turbo fan, which comprises a side plate 7 and a number of blades 8 provided integrally with the side plate. 9 denotes a support leg 11 on a top plate 10 of the unit body 2. , A nozzle port for sucking room air from the suction grill 3 into the centrifugal fan 6, 13 a drain pan made of styrene foam formed in an annular shape, 14 a circumferential direction from the centrifugal fan 6. The upper end 16 is disposed in the discharge side ventilation passage 15 through which air is discharged to the peripheral end 17 of the side plate 7.
This is an annular heat exchanger that is disposed so as to be shifted upward.

Reference numeral 18 denotes an annular airflow guide disposed between the peripheral end 17 of the side plate 7 of the centrifugal fan 6 and the upper end 16 of the heat exchanger 14 to guide the air discharged from the centrifugal fan 6 to the upper end 16 of the heat exchanger 14. It is.

Reference numeral 19 denotes a wind direction changing device that exchanges heat with the heat exchanger 14 and smoothly guides the cooled or heated discharge air to the blowing passage 20.

Reference numeral 21 denotes a suspension bolt for pushing the unit body 2 from the ceiling hole 23 of the ceiling plate 22 into the ceiling space 24 so as to be suspended and fixed to the ceiling beam 25.

With such a configuration, the room air drawn into the centrifugal fan 6 from the suction grill 3 through the air filter 26 and the nozzle port 12 is discharged from the centrifugal fan 6 in the entire circumferential direction. Among the discharged air, the air discharged from the blades 8 on the side of the peripheral end 17 of the side plate 7 is moved along the air flow guide 18 by the Coanda effect adhering to the wall surface of the air flow guide 18 at the upper end of the heat exchanger 14 as shown by a solid arrow. 16 and the remaining air discharged from the blades 8 is guided to the central portion and the lower end side of the heat exchanger 14 as indicated by the one-dot chain line arrow, so that the discharged air is diffused substantially uniformly to the heat exchanger 14. The collision is relieved, the generation of noise is suppressed, and heat is efficiently exchanged with the entire heat exchanger 14 to be cooled during cooling or heated during heating. In addition, since the cooled or heated air is smoothly guided to the blowing passage 20 by the wind direction changing device 19, the generation of pressure loss and noise due to the generation of the vortex is suppressed. Then, the room is cooled or heated by descending in the outlet passage 20 and blowing out from the outlet 4 while changing the wind direction by the wind direction changing blades 27.

Note that, unlike the above-described embodiment, the present invention can be applied to a three-way blowout type unit using a U-shaped heat exchanger, and a radial fan may be used instead of a turbo fan as a centrifugal fan.

(G) Effects of the Invention The present invention provides a centrifugal fan having a single-suction centrifugal fan between a peripheral end of a side plate and an upper end of a heat exchanger displaced upward from the peripheral end. Since the airflow guide with a slope toward the peripheral end is arranged, the air discharged from the centrifugal fan is also guided to the upper end of the heat exchanger, and the discharged air is diffused almost uniformly, so that the collision with the heat exchanger is eased. As a result, noise can be reduced, and heat is effectively exchanged with the entire heat exchanger, so that high heat exchange efficiency can be obtained.

[Brief description of the drawings]

The drawings are longitudinal sectional views of a heat exchange unit showing an embodiment of the present invention. 6 ... centrifugal fan, 7 ... side plate, 8 ... blade, 14 ...
Heat exchanger, 15: discharge side ventilation path, 16: upper end of heat exchanger, 17: peripheral edge of side plate, 18: air flow guide.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Nishikawa 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yukio Aizawa 2--18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-55-12365 (JP, A) JP-A-60-12114 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 1 / 00

Claims (1)

(57) [Claims] 1. A one-suction centrifugal fan comprising a side plate and a large number of blades provided on the side plate, and a discharge side ventilation passage surrounding the centrifugal fan, the upper end of which is above the peripheral end of the side plate. A heat exchanger that is displaced, and is disposed between the peripheral end of the side plate and the upper end of the heat exchanger, and has an inclination from the upper end of the heat exchanger toward the peripheral end of the side plate, and the centrifugal A heat guide unit for guiding the discharge air from the mold fan to the upper end of the heat exchanger.