JPS6319779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a heat exchange unit suitable for a ceiling-embedded air conditioning unit.

(b) Conventional technology A ceiling-embedded air conditioning unit has been implemented in which the unit body is embedded in the ceiling, indoor air is taken in from the center of a ventilation grille, and conditioned air is blown into the room from the sides around the entire circumference of the grille. It is presented in 1988-129424.

As pointed out in this publication, if a plate fin type heat exchanger is simply formed into an annular shape, the air discharged from the Sirotskov fan while curved in the circumferential direction collides obliquely with the plate fins, resulting in wind noise. Because of this, it was necessary to bend the plate fins diagonally so that they were parallel to the discharge air flow.

(c) Problems to be solved by the invention Large processing equipment is required to form a plate fin type heat exchanger into an annular shape, and the edge of the plate fin on the air suction side is Because the plate fins were bent, they were weakened, and there was a problem that the edges would get crushed during processing.

In addition, the static pressure obtained at the blade outlet of the Shirotsuko fan is small, and the original air blowing characteristics cannot be obtained unless a scroll part is used to gradually increase this pressure and blow out air. Using a Sirotskov fan as the type of fan was not preferable from the viewpoint of air blowing efficiency.

(d) Means for solving the problems In view of the above-mentioned problems, the heat exchange unit of the present invention surrounds the turbo fan in the ventilation passage within the unit body through which air is discharged from the turbo fan in the entire circumferential direction. A heat exchange coil with needle-like fins is arranged in a ring shape.

(E) Effect The heat exchange coil with needle-like fins has no directionality for air flow due to the large number of needle-like fins, and
Since the turbo fan has extremely high static pressure at the blade outlet, the air discharged from the turbo fan while curving around the entire circumference passes almost uniformly between the needle fins under high static pressure. be done.

(F) Embodiment Figure 1 is a longitudinal cross-sectional view of the unit of the present invention, and Figure 2 is a cross-sectional view of the unit taken along the -' arrow in Figure 1. A unit body 2, a suction grill 3 in the center, and air outlets 5, 6, 7 with air direction changing plates 4 on the four sides of the outer periphery.
8 and a ventilation decorative grill 9.

10 is a turbo fan which is rotated in the direction of the dashed arrow shown in FIG. 15 is a drain pan formed of polystyrene foam into an angular ring shape having an inner rising portion 16 and an outer rising portion 17;
18 is a heat exchange coil with angular annular needle-like fins 20 disposed so as to surround the turbo fan 10 in the ventilation passage 19 in the unit main body 2 through which air is discharged from the turbo fan 10 in the circumferential direction; 2
1 is a drain pump that scoops up the drain water generated by this heat exchange coil from the drain pan 15 and discharges it outdoors with a drain hose 22; 23, 23 are for heating, which are arranged diagonally on the windward side of the heat exchange coil 18; These parts of the auxiliary electric heater are housed in the unit main body 2 as shown.

To explain the formation of the heat exchange coil 18 described above, the needle fins 2 are attached to the heat exchange pipe 24.
As shown in Figure 2, six straight tubes wrapped with 0 are bent spirally from the inside to the outside, and 3 sets are made by stacking 2 each on top of each other and joining them with a U-bend 25. By stacking the pipes vertically and connecting these three sets of heat exchange pipes 24 in series, six stages of heat exchange coils 18 with two rows of inner and outer rows are formed as shown in FIG.

Furthermore, the above-mentioned drain pan 15 has four outer surfaces recessed inward to form blow-off passages 26 that communicate with the blow-off ports 5, 6, 7, and 8, respectively, and a storage section 27 of the drain pump 21 and a heat exchange pipe. 24 and a take-out portion 28 are integrally provided.

Reference numeral 29 denotes a positioning frame attached to the four circumferential sides of the unit main body 2, and the unit main body 2 is pushed into the ceiling space 32 through the ceiling hole 31 of the ceiling plate 30, and the unit main body 2 is suspended from the ceiling beam 33 by the hanging bolts 34,
34, the vertical alignment with the ceiling board 30 is performed using the overhanging piece 35, and this overhanging piece prevents the ceiling board 30 from lowering. Cover it to maintain its beauty.

With the structure described above, the indoor air sucked into the turbo fan 10 from the suction grill 3 through the nozzle port 11 is discharged from the turbo fan 10 while being curved in the entire circumferential direction as shown by the solid arrow shown in FIG. Ru. In addition, the discharged air is discharged from the outlet of the blade 36 under extremely high static pressure, and the heat exchange coil 18 with needle-like fins is formed in two rows around the entire circumference, making the ventilation resistance substantially uniform. Since the discharge air has a high static pressure, it passes through the heat exchange coil 18 almost uniformly while overcoming the ventilation resistance between the needle fins 20, and is cooled by this heat exchange coil 18 during cooling, and during heating. heated. Also, during heating, the discharge air from the turbo fan 10 is heated by the electric heaters 23, 23, and a portion of the air passes through the heat exchange coil 18, and the remainder of this heated air is discharged air that does not come into contact with the electric heaters 23, 23. and then passed through the heat exchange coil 18. The conditioned air that has been cooled or heated by exchanging heat with the heat exchange coil 18 is blown into the room from the blow-off ports 5, 6, 7, and 8 through the blow-off passages 26, respectively, thereby heating and cooling the room.

In the above embodiment, the heat exchange coil 18 with needle-like fins is formed into an angular annular structure so that the remaining space 3 between the turbo fan 10 and the heat exchange coil 18 is
Although the auxiliary electric heaters 23, 23 for heating are arranged in the heater 7, if the unit form is such that the electric heater 23 is not attached, the heat exchange coil 18 can be made into a circular annular structure along the turbo fan 10. good.

(G) Effects of the Invention According to the present invention, as an annular heat exchanger in which the air discharged from a fan is forced between the fins while being curved, it can be easily formed into an annular shape without large processing equipment, and it is possible to Since we used a heat exchange coil with needle-like fins, the fins are less prone to collapse and the fins have no directionality with respect to airflow.
Compared to conventional plate fin type heat exchangers, it is easier to manufacture and can ensure high heat exchange efficiency.

Furthermore, we focused on the fact that heat exchange coils with needle-shaped fins have high ventilation resistance, and adopted a turbo fan that can obtain high static pressure sufficient to overcome this ventilation resistance without increasing the rotation speed, resulting in low noise. The desired air volume can be secured under the conditions, and the noise of the fan and motor, which is sent out in the circumferential direction of the fan together with the discharged air of the turbo fan, is reduced by the heat exchange coil with needle-like fins that surrounds this fan and has high ventilation resistance. It is possible to achieve even lower noise levels.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a heat exchange unit showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the unit taken along the arrow -' in FIG. 2...Unit body, 10...Turbo fan, 18
...Heat exchange coil with needle fins, 19...Ventilation passage.

Claims (1)

[Claims] 1. A heat exchange unit in which a heat exchange coil with needle-like fins is arranged in an annular manner so as to surround the turbo fan in a ventilation passage within the unit main body through which air is discharged from the turbo fan in the entire circumferential direction.