JPH0320663Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a ceiling-embedded air conditioner.

[Conventional technology]

BACKGROUND ART Conventionally, as a type of air conditioner, a ceiling-embedded air conditioner is known, which is hung from a beam in the ceiling in the center of a room.

FIG. 6 is a vertical cross-sectional view of a conventional air conditioner of this type disclosed in, for example, Japanese Unexamined Patent Publication No. 55-14460. An air conditioner, generally designated by reference numeral 3, is located in the center of the room in the ceiling space between the two rooms. This air conditioner 3 is suspended from a beam 1 by hanging bolts 4 and has a housing 5 that opens downward.
The lower end opening thereof is closed by a decorative grille 6 fixed to the ceiling plate 2, which has a large number of suction ports 6a and air outlets 6b. A pair of heat exchangers 7 are fixed to and suspended from the top plate of the casing 5, and extend along the entire length of the casing 5 in the depth direction. A drain van 8 is supported by a decorative panel 6 through a rectifying plate 9 and installed therein. Below the drain pan 8, a Shirotsuko-type blower 10 is fixed to one side plate of the housing 5 and has a suction port 10a that opens laterally and a discharge port 10b that opens upward.

With the above configuration, when the blower 10 rotates, indoor air is sucked in through the suction port 6a, enters the space below the drain pan 8, is sucked in through the suction port 10a of the blower 10, and flows into the discharge port 1.
It is discharged from 0b into the space above the drain pan 8. After the discharged air undergoes heat exchange in the heat exchanger 7, it is blown down through the outer wall of the casing 5 and the rectifying plate 9, and is blown into the room from the outlet 6b. Water droplets generated by cooling are collected in a drain pan 8 and collected.

[Problem that the invention attempts to solve]

However, in order to reduce noise, conventional air conditioners configured in this way use a Shirotsuko-type blower 10. In this case, the blower may be made smaller or placed between the heat exchangers on both sides. If the air flow resistance increases, the noise will increase, so it is necessary to make the blower larger.
The problem was that the heat exchanger had to be placed one above the other, which made the entire air conditioner higher, making it impossible to install the air conditioner if the ceiling was low. .

This invention was made in view of the above points, and the purpose is to provide an air conditioner with a low height and low noise.

[Means for solving problems]

In order to achieve this purpose, in this invention, a circular heat exchanger is fixed at the center of the box suspended in the space above the ceiling board, and the axis is perpendicular to the center of the circular heat exchanger and the motor is directly connected. An axial flow fan was installed, and a conical rectifier plate was installed above the fan and supported by the box body.

[Effect]

By doing this, when the axial flow fan rotates, the air sucked in from the intake port of the decorative grille that closes the lower open end of the housing is discharged above the axial flow fan, collides with the rectifier plate, and disturbs the heat exchanger. After being deflected, heat is exchanged in a heat exchanger, and the air is discharged from the outlet of the decorative grill. Since the axial fan is inserted into the space of the circular heat exchanger, the height of the box is only slightly higher than the height of the heat exchanger, making it possible to reduce the height of the unit.

In addition, the performance of the blower alone is improved by the use of the rectifying plate, and the flow of air entering the heat exchanger becomes uniform, reducing air path resistance and reducing noise.

〔Example〕

1 and 2 show a first embodiment of the air conditioner according to the present invention, and FIG. 1 is a longitudinal sectional view thereof;
FIG. 2 is a sectional view taken along the line AA in FIG. 1. In the figure, in the attic between the beam 1 and the ceiling board 2 of the building,
An air conditioner 3 is placed in the center of the room. This air conditioner 3 includes a box 5 that is suspended from a beam 1 by anchor bolts 4 and opens downward. A motor 1 is installed in the center of the upper plate of this box body 5.
2 is fixed. Reference numeral 11 denotes an axial flow fan attached to the shaft of a motor 12, and a decorative grille 6 having a large number of inlets 6a and outlets 6b is provided below the fan to close an opening in the ceiling plate 2. Further, around the axial fan 11, a drain pan 8 formed in the shape of a gutter and also serving as a bell mouth is disposed and supported by the decorative grille 6. A heat exchanger 7 is fixed to the top plate of the box body 5 and hangs down. Above the axial fan 11, a rectifier plate 13 formed in a conical shape is supported by the box body 5.

With this configuration, when the motor 12 rotates and the axial fan 11 rotates, indoor air is sucked into the upper part of the axial fan 11 from the suction port 6a. is installed, so the sucked air collides with this rectifying plate 13 and is deflected toward the heat exchanger 7, where the air is exchanged with heat and then blown into the room from the air outlet 6b.

By making the fan an axial flow fan, both the suction direction and the blowout direction are axial, so the vertical dimension is smaller compared to the Shirotsuko type blower, in which the suction direction and the blowout direction are perpendicular. In addition to being reduced to a large width, even if the axial fan 11 is inserted into the box body 5 to further reduce the width, the direction of the air is rectified by the presence of the rectifying plate 13 and the air flows smoothly toward the heat exchanger 7. Therefore, the performance of the blower is improved, the flow of air entering the heat exchanger 7 becomes uniform, and the air path resistance is reduced.

FIG. 3 shows a characteristic diagram of the axial fan, in which the solid line shows the case without the current plate 13, and the broken line shows the case with the current plate 13. As is clear from the figure, by providing the rectifying plate 13, the specific noise level Ks, which is a coefficient for comparing noise per unit pressure and unit air volume, is reduced, and the noise is lowered by 3 to 5 dB in the octave relative level. In addition, the wind pressure ψ per air volume φ increases, improving efficiency.

FIG. 4 is a longitudinal cross-sectional view of an air conditioner showing a second embodiment of this invention, and is a vertical sectional view of the air conditioner shown in FIGS.
Components having the same configuration as the embodiment shown in the figures are given the same reference numerals, and their explanations will be omitted. In this embodiment, a conical current plate 13 is provided with a number of holes for diffusing noise, and a sound absorbing material 14 is pasted on the inside of the current plate 13 to prevent wind from blowing through. With this configuration, the same effect as the first embodiment and the effect of sound absorption on the current plate can be obtained.

FIG. 5 is a vertical cross-section of an air conditioner showing a third embodiment of this invention, and parts having the same configuration as the embodiment shown in FIGS. 1 and 2 are given the same reference numerals.
The explanation will be omitted. In this embodiment, the conical rectifier 13 is made of a sound absorbing material. With this configuration, the same effect as the first embodiment and the effect of sound absorption on the current plate can be obtained.

[Effect of idea]

As explained above, according to this invention, in an air conditioner, a circular heat exchanger is fixed in the upper center of the box suspended in the space above the ceiling board,
An axial flow fan whose axis direction is perpendicular and is directly connected to the motor is installed in the center of the fan, and a conical rectifier plate is installed above the fan supported by the box body, so that the rotation of the axial fan causes suction. The air discharged upward is changed by contacting the rectifying plate and directed toward the heat exchanger, reducing noise. Since it is possible to ensure excellent air volume characteristics even when installed in the ceiling, the height of the entire device is significantly lower than that of conventional large-sized Shirotsuko-type blowers, making it possible to install it even in narrow spaces under the ceiling. Improved versatility.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an air conditioner showing the first embodiment of the air conditioner of this invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a characteristic diagram of an axial flow fan. , FIG. 4 is a longitudinal sectional view showing a second embodiment of this invention,
FIG. 5 is a longitudinal sectional view showing a third embodiment of this invention, and FIG. 6 is a longitudinal sectional view of a conventional air conditioner. In the figure, 2 is a ceiling board, 3 is an air conditioner, 5 is a box body, 6 is a decorative grill, 6a is an inlet, 6b is an outlet, 7 is a heat exchanger, 13 is a rectifier plate, 14 is a sound absorbing material, 15 is a It is a hole. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An air conditioner that has a box suspended in a space above a ceiling board, and a decorative grille that closes the lower open end of the box and has an inlet and an outlet. In the machine, a circular heat exchanger is fixed at the center of the upper part of the box, and an axial flow fan directly connected to the motor whose axis direction is perpendicular is disposed in the center of the circular heat exchanger and supported by the box. In addition, an air conditioner characterized in that a conical rectifying plate is supported on the box body side and installed so that the air outlet collides with the upper part of the axial fan and deflects the flow toward the heat exchanger. . (2) Utility model registration claim 1, characterized in that the baffle plate has a number of holes for diffusing the noise generated in the axial blower, and a sound absorbing material is pasted on the inside of the baffle plate. Air conditioner as described in section. (3) The air conditioner according to claim 1, wherein the baffle plate is made of a sound-absorbing material.