JP7230334B2 - Ceiling-mounted air conditioner - Google Patents

Description

The present invention relates to a ceiling-embedded air conditioner (indoor unit).

A ceiling-embedded air conditioner installed above the ceiling in an air-conditioned room has a box-shaped main unit installed above the ceiling and a decorative panel covering the lower surface of the main unit and exposed to the ceiling surface in the room. A refrigerant circuit is formed by being connected to an outdoor unit installed outdoors through a refrigerant pipe.

A suction port and an air outlet are formed in the decorative panel. Inside the main unit are a heat exchanger, a fan unit using a sirocco fan having an impeller and a fan casing, and a fan unit that collects dew generated in the heat exchanger and directs the air blown out from the sirocco fan in the direction of the decorative panel. A drain pan or the like with a leading outlet opening is provided. The sirocco fan of the fan unit draws in air from the intake port of the decorative panel via the heat exchanger, and the air that has been heat-exchanged with the refrigerant in the heat exchanger is air-conditioned from the outlet of the decorative panel through the outlet opening of the drain pan. Blow out into the room (Patent Document 1).

JP-A-2000-213767

By the way, the dew generated in the heat exchanger is collected by the drain pan as described above, but no special measures are taken for the dew adhering to the outside of the fan casing of the sirocco fan. However, although the amount of dew on the fan casing was small, there was still the possibility that the dew would fall into the room from the outlet of the decorative panel.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ceiling-mounted air conditioner that prevents dew adhering to the fan casing from falling into the room from the outlet of the decorative panel.

In order to achieve the above object, the invention according to claim 1 is a ceiling-embedded air conditioner comprising a main unit and a decorative panel having an air inlet and an air outlet and attached to the bottom surface of the main unit. , the main unit includes a box-shaped housing, a heat exchanger attached inside the housing, a fan motor, an impeller rotated by the fan motor, and a fan casing surrounding the impeller. a fan unit using a sirocco fan that sucks air from the suction port of the decorative panel through the heat exchanger and blows it out from a blowout cylinder; a groove that collects dew generated in the heat exchanger; and the sirocco fan a drain pan formed with a blowout opening for allowing the air blown out from the blowout cylinder to pass through the blowout opening of the decorative panel, and the fan casing is disposed between the heat exchanger through which the air passes and the blowout opening. A dew receiving portion is provided so that the periphery of the blowout cylinder is inserted inside the peripheral wall of the blowout opening of the drain pan and receives dew falling from the outside of the fan casing.
The invention according to claim 2 is the ceiling-embedded air conditioner according to claim 1, wherein the dew receiving part is provided between the groove of the drain pan and the blowout opening. .

According to the present invention, dew falling from the outside of the fan casing of the sirocco fan is received by the dew receiving portion, and can be prevented from falling into the room from the outlet of the decorative panel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an installation state of a ceiling-embedded air conditioner according to an embodiment of the present invention; FIG. 2 is a perspective view of the ceiling-embedded air conditioner of FIG. 1; 3 is a perspective view of a main unit of the ceiling-mounted air conditioner of FIG. 2. FIG. FIG. 4 is an exploded perspective view of the main unit of FIG. 3; It is a top perspective view of a drain pan. It is a perspective view of a reinforcing metal fitting. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2; FIG. 7 is a cross-sectional view taken along line CC of FIG. 6; FIG. 3 is a perspective view showing a cross section taken along line AA of FIG. 2;

A ceiling-mounted air conditioner 100 according to an embodiment of the present invention will be described below. This ceiling-mounted air conditioner 100 is, as shown in FIG. Form. The ceiling-mounted air conditioner 100 has a box-shaped main unit 200 arranged in the ceiling space T2, and a decorative panel 300 attached to the bottom surface of the main unit 200 so as to be exposed to the air conditioning room R side. As shown in FIG. 2, the main unit 200 includes an electrical component box 400 having a control circuit mounted on its side surface.

Further, the decorative panel 300 is formed with blowout guide cylinders 310, 320, 330, 340 as blowout ports from the left side to the right side of the front. The air passing through the leftmost blowout guide cylinder 310 passes through the central blowout guide cylinders 320 and 330 by means of the blowout guide cylinder 310 and the vertical wind direction plate 311 that rotate together with the leftmost rotating plate 380. By 321, the air passing through the right end blow guide cylinder 340 can be adjusted in the vertical blow direction by the blow out guide cylinder 340 rotating together with the right end rotating plate 390 and the vertical wind direction plate 341. Rotating plate 380 is rotatable 90 degrees leftward from the state shown in FIG. 2, and rotating plate 390 is rotatable 90 degrees rightward from the state shown in FIG.

A suction port 350 having a shape elongated in the left-right direction is formed behind the arrangement of the blow-out guide cylinders 310, 320, 330, 340 on the lower surface 370 (the surface facing the air conditioning room R shown in FIG. 1) of the decorative panel 300. The inlet 350 is covered with a grill 360. Between the grille 360 and the front portion 372 of the lower surface 370 of the decorative panel 300, the portion between the grille 360 and the vertical wind direction plates 311 to 341 forms a projection 371 projecting downward as will be described later. It protrudes downward from the portion 372 .

FIG. 3 shows the body unit 200 viewed from below with the decorative panel 300 removed, and FIG. 4 shows an exploded view of the body unit 200 viewed from below. The main unit 200 includes a steel plate housing 500, a heat exchanger 600, a fan unit 700, a drain pan 800, a drain pump 900 having a suction port 910 and a discharge port 920, in addition to the electrical component box 400 described above. Prepare.

The housing 500 has a box shape formed by a rectangular top plate 510 , a front plate 520 extending downward from the four sides of the top plate 510 , a rear plate 530 , a left side plate 540 and a right side plate 550 . The electrical component box 400 shown in FIG. 2 is attached to the right side plate 550 , and the drain pipe 551 is attached to the same right side plate 550 . Furthermore, two mounting brackets 560 are attached to the left side plate 540 and the right side plate 550 on the top plate 510 side. The main unit 200 is installed in the ceiling space T2 by suspending the mounting bracket 560 with a suspension bolt (not shown) fixed to the ceiling space T2.

The heat exchanger 600 is housed in the housing 500 and consists of a first heat exchanger 610 arranged on the front plate 520 side of the housing 500 and a second heat exchanger 620 arranged on the rear plate 530 side. have. The upper side of the first heat exchanger 610 is inclined toward the front plate 520 of the housing 500 , and the upper side of the second heat exchanger 620 is inclined toward the rear plate 530 of the housing 500 . The upper ends of the heat exchangers 610 and 620 are attached to the top plate 510 of the housing 500 . A motor shaft support plate 630 for supporting a motor shaft 712, which will be described later, is attached to each end of the heat exchangers 610, 620 on the left side plate 540 side. A motor shaft support plate 640 for supporting a motor shaft 713, which will be described later, is attached to each end of .

The fan unit 700 includes a double shaft fan motor 710 having a motor mounting base 711, two impellers 721 and 722 fixed to one rotating shaft 712 of the fan motor 710, and the other rotating shaft 712 of the motor 710. It has two impellers 723, 724 fixed to a rotating shaft 713, and fan casings 731-734 that individually surround each impeller 721-724. The fan casings 731 to 734 include upper surface attachment portions 731a to 734a attached to the top plate 510 of the housing 500, side suction openings 731b to 734b, and blowout cylinders 731c to 734c formed to protrude downward. , respectively. The impeller 721 and the fan casing 731, the impeller 722 and the fan casing 732, the impeller 723 and the fan casing 7331, and the impeller 724 and the fan casing 734 form sirocco fans, respectively.

The drain pan 800 is made of a heat insulating material 810 made of polystyrene foam. In this heat insulating material 810, four blowing openings 821 to 824 are formed in a line in the horizontal direction, penetrating from the upper surface 810a to the lower surface 810b. Further, as shown in FIG. 5, the drain pan 800 is formed in a substantially rectangular shape having long sides of a rear end portion 810c and a front end portion 810d.

A groove 833 for receiving dew generated in the heat exchanger 630 is formed on the upper surface 810a of the heat insulating material 810 between the outer wall 831 on the far end 810c side and the inner wall 832 on the far side. A groove 843 for receiving dew generated in the second heat exchanger 620 is formed between the outer wall 841 on the front end portion 810d side and the inner wall 842 on the front side. Further, a groove 853 is also formed between the outer wall 851 on the right end portion 810e side and the inner wall 852 on the right side. Further, between the inner wall 832 and the peripheral walls 821a to 824a of the blowout openings 821 to 824, grooves 834 are formed that serve as dew receivers for dew adhering to the outside of the fan casings 731 to 734. As shown in FIG. Furthermore, between the inner wall 842 and the peripheral walls 821a to 824a of the blowout openings 821 to 824, grooves 844 are formed that act as dew receivers for dew adhering to the outside of the fan casings 731 to 734. As shown in FIG. Furthermore, a drain tank 860 is formed at the right rear of the upper surface 810a of the heat insulating material 810. As shown in FIG. The grooves 833 and 853 are continuous with the drain tank 860 , and the groove 843 is continuous with the groove 853 . That is, the drain water accumulated in the grooves 833, 843, 853 is collected in the drain tank 860. Grooves 843 and 833 do not communicate with grooves 844 and 834 .

A reinforcing metal fitting 870 having a shape as shown in FIG. The reinforcing metal fitting 870 includes a long piece 871 corresponding to the back end 810c of the drain pan 800, a long piece 872 corresponding to the front end 810d, a short piece 873 connecting the left sides of the long pieces 871 and 872 in FIG. It has a short piece 874 connecting the right side of the long piece 872 in FIG. The overall shape of this reinforcing metal fitting 870 is a rectangular shape in which long pieces 871 , 872 and short pieces 873 , 874 surround the outside of the arrangement of blowout openings 821 to 824 of the drain pan 800 . The reinforcing metal fittings 870 are embedded in the heat insulating material 810 by positioning the reinforcing metal fittings 870 in advance in a mold for molding the heat insulating material 810, and then foaming the foamed polystyrene. As a result, the reinforcing metal fitting 870 is integrated with the heat insulating material 810 such that the long pieces 871 and 872 are embedded inside the heat insulating material 810 and the short pieces 873 and 874 and the mounting pieces 875 and 876 are exposed.

The blowout guide cylinder 310 of the decorative panel 300 communicates with the blowout opening 821 of the drain pan 800, the blowout guide cylinder 320 communicates with the blowout opening 822 of the drain pan 800, the blowout guide cylinder 330 communicates with the blowout opening 823 of the drain pan 800, and blows out. Guide tube 340 is formed to communicate with blowout opening 824 of drain pan 800 . The vertical airflow direction plate 311 of the left blowing guide tube 310 and the vertical airflow direction plate 341 of the right blowing guide tube 340 can be rotated by 90 degrees as described above.

Here, the blow guide tube 320 will be described as a representative. As shown in FIG. 7, the blowout guide cylinder 320 is arranged such that the upper end opening 322 communicates with the blowout opening 732c of the fan casing 732 and the blowout opening 822 of the drain pan 800, and the lower end opening 323 faces obliquely forward and downward. A ventilation passage 324 from the upper end opening 322 to the lower end opening 323 has a smoothly curved shape. A vertical airflow direction plate 321 shared with the airflow guide cylinder 330 is attached to the lower end opening 323 as the airflow opening, and a left/right airflow direction plate 325 for the airflow guide cylinder 320 is installed in the upper part of the air passage 324 . A lower end 323 a of the lower end opening 323 protrudes downward beyond the front portion 372 of the lower surface 370 of the decorative panel 300 . A left/right airflow direction plate (not shown) similar to the left/right direction plate 325 is also attached in the ventilation passage (not shown) of the blow-out guide cylinder 330 . Left and right airflow guide cylinders 310 and 340 are attached with left and right airflow direction plates (not shown), and the vertical airflow direction plates 311 and 341 are rotatable by rotation of rotating plates 380 and 390. is irrelevant to the present invention, so a detailed description is omitted.

Here, assembly of the ceiling-mounted air conditioner 100 will be described with reference to FIG. 4 as needed. First, the housing 500 of the main unit 200 is placed with the top plate 510 side facing the assembly table, and the assembled first heat exchangers 610 and 620 are fixed inside the top plate 510 .

Next, after aligning the assembled fan unit 700 between the first heat exchangers 610 and 620, the motor mount 711 of the motor 710 is screwed to the top plate 510, and one rotating shaft 712 is It is supported by the motor shaft support plate 630 and the other rotating shaft 713 is supported by the motor shaft support plate 640 . Further, the upper mounting portions 731a to 734a of the fan casings 731 to 734 are screwed to the top plate 510. As shown in FIG.

At this time, as shown in FIG. 4, the distance between the center C1 of the motor rotation shafts 712 and 713 of the fan unit 700 and the vertical center C2 of the first heat exchanger 610 on the front side is L1. When the distance from the center C3 in the vertical direction of the second heat exchanger 620 is L2, the fan unit 700 is arranged so as to satisfy L1<L2, and the fan unit 700 is positioned in front of the second heat exchanger 620 on the back side. 1 close to the heat exchanger 610;

Next, the drain pump 900 is attached inside the right side plate 550 of the housing 500, and its discharge port 920 is connected to the drain pipe 551 shown in FIG. Then, after aligning the second heat exchanger 620 with the groove 833 of the upper surface 810a of the drain pan 800 and aligning the first heat exchanger 610 with the groove 843, the drain pan 800 is placed inside the housing 500. The short side 873 of the reinforcing metal fitting 870 is screwed to the left side plate 540 of the housing 500 , and the mounting pieces 875 and 876 are screwed to the right side plate 550 . The drain pan 800 attached in this way faces the space S1 described later at its rear end 810c, and faces the space S2 described later at its front end 810d.

As described above, the blowout cylinders 731c to 734c of the four fan casings 731 to 734 of the fan unit 700 enter inside the peripheral walls 821a to 824a of the four blowout openings 821 to 824 on the upper surface 810a side of the drain pan 800. to 734 are communicated with the blowout openings 821 to 824 of the drain pan 800 . Also, the suction port 910 of the drain pump 900 is located in the drain tank 860 of the drain pan 800 .

Since the assembled main unit 200 is packed separately from the decorative panel 300, when installing the ceiling-mounted air conditioner 100, the packing is first unpacked, and then it is embedded in the ceiling space T2. The main unit 200 is hung from a plurality of hanging bolts and installed in the ceiling space T2. Then, the decorative panel 300 is attached from the air conditioning room R side shown in FIG. At this time, as shown in FIG. 7, the upper end opening 322 of the blowout guide cylinder 320 of the decorative panel 300 is inserted into the blowout opening 822 from the lower surface 810b of the drain pan 800 to communicate with the blowout cylinder 732c of the fan casing 732 . Similarly, the remaining blowout guide cylinders 310, 330, 340 are inserted into the blowout openings 821, 823, 824 of the drain pan 800 to communicate with the blowout cylinders 731c, 733c, 734c of the fan casings 731, 733, 734. Then, the decorative panel 300 is screwed to the housing 500 of the main unit 200, and a refrigerant pipe, a power line, a signal line, and the like (not shown) are connected.

As shown in FIG. 8, the ceiling-mounted air conditioner 100 assembled as described above includes a space S1 between the second heat exchanger 620 on the back side and the rear plate 530 and a first heat exchanger on the front side. Space S2 between exchanger 610 and front plate 520 of housing 500 communicates with space S3 between lower surface 810b of drain pan 800 and decorative panel 300 . The blow-out guide cylinders 310 to 340 are arranged in this space S3, and the space S3 also serves as a space for communicating between them.

As described above, in the ceiling-embedded air conditioner 100 of the present embodiment, the lower end 232a of the lower end opening 323 of the blow-out guide tube 320 protrudes below the front portion 372 of the lower surface 370 of the decorative panel 300, and the lower end opening 323 of the lower end opening 323 The opening surface of is facing forward and obliquely downward. Also, the air passage 324 is smoothly curved downward of the front plate 520 . Therefore, the air blown out by the rotation of the impeller 722 is less susceptible to air volume loss due to the blow-out guide tube 320, and the reaching distance of the blown air flow to the front of the ceiling-mounted air conditioner 100 can be extended. . The same applies to the blow guide cylinders 310, 330, 340 as well.

In addition, the air sucked from the suction port 350 of the decorative panel 300 reaches the second heat exchanger 620 from the space S1 between the second heat exchanger 620 on the far side and the back plate 530 . Furthermore, the air sucked from the suction port 350 of the decorative panel 300 flows into the space S3 between the lower surface 810b of the drain pan 800 and the decorative panel 300 and between the blowout guide cylinders 310 to 340 and the first heat exchanger 610 on the front side. and the front plate 520, the first heat exchanger 610 on the front side is also reached. Therefore, it is possible to supply a sufficient amount of air to the first heat exchanger 610, which is farther from the suction port 350 than the second heat exchanger 620, so that the heat generated by the first heat exchanger 610 is Exchange is possible in the same way as the second heat exchanger 620, and the heat exchange efficiency of the ceiling-embedded heat exchanger can be enhanced. At this time, the upper side of the first heat exchanger 610 is inclined toward the front plate 520 of the housing 500 , and the upper side of the second heat exchanger 620 is inclined toward the rear plate 530 of the housing 500 . , and spaces S1 and S2, air is drawn in from below, so that the angle at which the drawn air is changed is gradually changed from a right angle to an obtuse angle, and the draft resistance is reduced. The efficiency of heat exchange between air and refrigerant is higher than when there is no inclination. In addition, by tilting the first and second heat exchangers 610 and 620 in this way, the vertical width becomes longer than when they are erected. It can be arranged, and the efficiency of heat exchange becomes high also in this aspect.

Furthermore, as shown in FIG. 7, the distance between the center C1 of the motor rotation shafts 711 and 712 of the fan unit 700 and the vertical center C2 of the first heat exchanger 610 is L1, and C1 and the second heat exchanger 620 L1<L2, where L2 is the distance from the upper and lower centers C3. At this time, the blowout cylinders 731c to 734c of the fan casings 731 to 734 are directed directly downward, that is, toward the drain pan 800. never hit. As described above, the fan unit 700 can be arranged closer to the first heat exchanger 610 than the second heat exchanger 620, and air is drawn into the first heat exchanger 610 closer to the fan unit 700. increase in volume. Therefore, the amount of air sucked into the first heat exchanger 610 is greater than the amount of air sucked into the second heat exchanger 620 compared to when L1=L2. Even in the first heat exchanger 610 having a longer flow path, the heat exchange efficiency is the same as that of the second heat exchanger 620, and the balance is improved. In other words, by setting L1<L2, the amount of air sucked into first heat exchanger 610 increases, and the balance of heat exchange efficiency between first heat exchanger 610 and second heat exchanger 620 is also improved. Further, when L2 is the same as the conventional one, the position of the first heat exchanger 610 is closer to the rear plate 530 side of the housing 500, so the front plate 520 of the housing 500 can be shifted to the rear plate 530 side. It is possible to reduce the front-to-rear dimension of the housing 500 . In addition, when the first heat exchanger 610 side of the fan casings 731 to 734 of the fan unit 700 contacts the first heat exchanger 610, the side of the fan casings 731 to 734 facing the first heat exchanger 610 is , and a horizontal planar shape cut along the line D1 shown in FIG.

Further, the fan casings 731 to 734 of the fan unit 700 are arranged so that the periphery of the blowout cylinders 731c to 734c is inserted inside the peripheral walls 821a to 824a of the blowout openings 821 to 824 of the drain pan 800 . On the other hand, in the drain pan 800, a groove 834 is formed on the side of the peripheral walls 821a to 824a of the groove 833 for the second heat exchanger 620, and the groove 844 is formed on the side of the peripheral walls 821a to 824a of the groove 843 for the first heat exchanger 610. is formed. Therefore, when dew adheres to the outside of the fan casings 731 to 734, the dew drops into the grooves 834 and 844 of the drain pan 800 and is received there, and propagates through the blowout guide cylinders 310 to 340 of the decorative panel 300 into the room. You can prevent it from falling. The grooves 843 and 833 do not communicate with the grooves 844 and 834 because the amount of dew that falls from the fan casings 731 to 734 is very small, but they may communicate with each other.

Furthermore, a reinforcing metal fitting 870 is attached to the drain pan 800 . The attachment is performed by embedding the reinforcing metal fittings 870 in the heat insulating material 810 of the drain pan 800 during manufacturing, so that the drain pan 800 is integrated. This reinforcing metal fitting 870 increases the strength of the drain pan 800 itself. Conventionally, a reinforcing plate is used to support the drain pan 800 from below. However, since the reinforcing metal fitting 870 is embedded in the lower surface 810b of the drain pan 800, the drain pan 800 is supported from below. can be omitted. Furthermore, since the short piece 873 and the mounting pieces 875 and 876 of the reinforcing metal fitting 870 are screwed to the housing 500, the housing 500 can be reinforced at the same time as the drain pan 800 is mounted.

100: Ceiling-embedded air conditioner 200: Main unit 300: Decorative panel 310 to 340: Blow-out guide tube 322: Upper end opening 323: Lower end opening 311, 321, 341: Vertical wind direction plate 350: Suction port , 360: grill, 370: lower surface, 380, 390: rotating plate 400: electrical component box 500: housing, 510: top plate, 520: front plate, 530: rear plate, 540: left side plate, 550: right side plate, 560: Mounting bracket 551: Hose 600: Heat exchanger 610: First heat exchanger 620: Second heat exchanger 630, 840: Motor shaft support plate 700: Fan unit 710: Fan motor 721- 724: impeller, 731 to 734: fan casing, 731c to 734c: blowout cylinder 800: drain pan, 810: heat insulating material, 821 to 824: blowout opening, 833, 834, 843, 844: groove, 860: drain tank, 870 : Reinforcing bracket 900: Drain pump

Claims (2)

A ceiling-embedded air conditioner comprising a main unit and a decorative panel having an air inlet and an air outlet and attached to the bottom surface of the main unit,
The main unit has a box-shaped housing, a heat exchanger attached inside the housing, a fan motor, an impeller rotated by the fan motor, and a fan casing surrounding the impeller. a fan unit using a sirocco fan that sucks air from the suction port of the decorative panel through the heat exchanger and blows it out from a blowout cylinder; a groove that collects dew generated in the heat exchanger; a drain pan formed with a blowout opening for allowing the air blown out from the blowout cylinder to pass through the blowout opening of the decorative panel;
The fan casing is arranged between the heat exchanger through which air passes and the blowout port , and is arranged so that the periphery of the blowout pipe enters the inside of the peripheral wall of the blowout opening of the drain pan, and the outside of the fan casing. A ceiling-embedded air conditioner characterized by comprising a dew receiver for receiving dew falling from a ceiling. In the ceiling-mounted air conditioner according to claim 1,
The ceiling-embedded air conditioner, wherein the dew receiving portion is provided between the groove of the drain pan and the blowout opening.

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