Indoor unit for an air conditioner

Abstract: An air conditioner indoor unit comprising a heat exchanger (1); a fan; a drain pan (4) provided under the heat exchanger (1), the drain pan (4) retrieving drain water condensed on the heat exchanger (1); an outlet nozzle member (3) provided under the drain (4), the outlet nozzle member (3) providing an air path for blowing off air supplied by the fan and a hollow space (7) between the drain pan (4) and the outlet nozzle member (3); a drain pan drainage (9) formed in the drain pan (4), the drain pan drainage (9) draining drain water stored in the drain pan (4); a hollow space drainage (10) formed in the outlet nozzle member (3) at a location close to the drain pan drainage (9), the hollow space drainage (10) draining drain water stored in the hollow space (7); and a drain hose (11) connected to the drain pan drainage (9) and the hollow space drainage (10).

Description: The present invention relates to an improvement in the assembly operation, a reduction in the cost and an improvement in the environmental issue of an air conditioner. In Figure 24 is shown a part of a conventional air conditioner, which includes a drain pan having a hollow space therein for thermal insulation, and which has been disclosed in JP-A-611148 for instance. The conventional air conditioner decrease the amount of a thermal insulation material to reduce fabrication steps, and the drain pan 24 is prepared so as to include an outer layer 25 made of ABS resin and the hollow space 26 formed therein by known gas injection molding. The function of the drain pan will be explained. In general, the inner side 28 of the drain pan 24 has the tendency to have a lower surface temperature than the outer side 27 since the inner side is close to a heat exchanger and contacts cooled droplets. However, the gas in the hollow space 26 inside the outer layer 25 has a superior thermal insulation property. Even if there is a temperature difference between the inner side 28 and the outer side 27, the gas in the hollow space 26 shuts off the heat transfer therebetween. By this arrangement, the air close to the outer side 27 is not noticeably cooled and vapor condensation is not provided on the outer side 27. In Figure 25 is shown a conventional plug arrangement for an air conditioner drain pipe, which has been disclosed in JP-A-58-33980 for instance, which is shown in exploded fashion. In this Figure, reference numeral 101 designates a drain pan, reference numeral 102 designates a drain pipe, Which is connected to the drain pan so as to pass therethrough, and reference numeral 103 designates a blind plug to be mounted to the drain pipe for clogging the drain pipe. The function of the blind plug will be explained. Referring to Figure 25, the drain pipe 102 is inserted in the drain pan 101 to be engaged therewith, and the blind plug 103 is forcibly capped on the drain pipe 102 to be engaged therewith. In Figure 26 is shown an exploded perspective view of essential portions of another conventional plug arrangement for a drain pipe, in Figure 27 is shown a cross-sectional view to explain how a drain pipe joint is mounted, in Figure 28 is shown a perspective view of the drain pipe joint, and in Figure 29 is shown cross-sectional view to explain how a blind plug is mounted. In Figure 30 is shown a perspective view of the blind plug. In these Figures, reference numeral 101 designates a drain pan, reference numeral 102 designates a drain pipe joint, which passes through and is engaged with a hole 101a formed in the drain pan 101, reference numeral 102a designates a flange of the drain pipe joint 102, reference numeral 102b designates the tubular body of the drain pipe joint 101, reference numeral 102c designates a stopper, which is provided on an end of the tubular body of the joint and has a leading edge provided with a conical portion, and reference numeral 102d designates a through hole in the drain pipe joint. If the drain pipe joint 102 is not needed, the blind plug 103 is inserted into the hole 101a in the drain pan 101 to be engaged therewith as shown in Figure 29. If the joint is needed, the joint 102 is inserted into the hole 101a in the drain pan 101 to be engaged therewith as shown in Figure 27. A hose 104 for leading drain water to outside is engaged with the joint 102 as shown in Figure 31 to drain the water from the drain pan to outside through the through hole in the joint 102 and the hose. The drainage for a drain pan thus prepared is used in an air conditioner as in the fashion shown in Figure 32. Since the conventional drainage is thus constructed, the blind plug and the joint must be exchanged as required, which takes some time to exchange the parts, or which means that the plural parts are required to be ready all the time, that is wasteful. Since the conventional air conditioner is configured to be provided with the hollow space by gas injection, the air layer cannot be provided so as to have a certain thickness or more, which means that a great deal of thermal insulation cannot be provided. Costs, such as a molding cost, are required. From the viewpoint that the environmental issue has been presently discussed, it is recommended that used parts can be easily separated according to type. When an insulation material or a similar member is provided on a lower side of a heat exchanger to prevent secondary air from being sucked, there has been created a problem in that separation of the insulating material for disposal is troublesome. JP-A-50007553 discloses an air conditioner indoor unit in which a drain pan comprises a drainage outlet and a further drainage outlet is provided for the interior of the unit body. JP-A-6026664 discloses an air conditioner indoor unit comprising a drain pan and a drainage outlet. A fan draws air through a heat exchanger and then the air leaves the air conditioner via an outlet located below the drain pan. JP-A-5705535 discloses an air conditioner indoor unit comprising a fan arranged to blow air through a heat exchanger. A drain pan is provided below the heat exchanger. The accumulated water in the drain pan is heated by un-cooled air from the fan that passes through a gap between the drain pan and the heat exchanger and by air that passes underneath the drain pan. It is an object of the present invention to eliminate these problems, and to improve the thermal insulation property of a drain pan. It is another object of the present invention to provide required parts at a low cost. It is a further object of the present invention to provide drainage treatment with more reliable fashion. It is a still further object of the present invention to facilitate separation of parts for disposal from the viewpoint of product assessment. The present invention provides an air conditioner indoor unit as set out in claim 1. In accordance with the present invention, the hollow space can work for thermal insulation between the drain pan and the outlet nozzle member to dispense with a thermal insulation material and to eliminate the problem of dew drops due to peeling of a thermal insulation material, carrying out drainage in more reliable fashion. The drain pan drainage and the hollow space drainage may be provided in concentric fashion so that the drain pan drainage is located inside the hollow space drainage. The drain pan drainage may have a leading edge provided with a trough-shaped guide. This arrangement can direct the drain water from the drain pan drainage to the drain hose in more reliable fashion. The drain pan drainage and the hollow space drainage may be combined so as to provide a pair of drainages, and a rubber plug with dual concentric flanges may be provided on the pair of drainages when the drainages are not in use. By this arrangement, both drainages can be closed by the single rubber plug. The outlet nozzle member and the drain pan may be made of different materials, and the drain pan may be made of polypropylene resin. By this arrangement, the occurrence of a creak between parts due to thermal shrinkage can be restrained. The heat exchange may have a lower end provided with an insulation member to separate a space under the heat exchanger into a primary side and a secondary side, the drain pan may be provided with a rib, and the insulation member is engaged with the rib. By this arrangement, it is possible to remove the insulation member easily for disposal, facilitating the separation of parts. The insulation member may have angular holes and slots formed therein, the rib may have projections in a triangular shape alternately provided on both lateral sides thereof, and the angular holes may receive the projections in alternate fashion. The drain pan may be provided with two ribs, one of ribs may have a lateral side facing the other rib provided with projections in a triangular shape, the insulation member may have angular holes formed therein, and the insulation member may be inserted into a gap between the ribs with the ribs fitted into the angular holes. The drain pan may include an additional drainage, which has a drain pipe joint inserted thereinto. The drain pipe joint may comprise a tubular body with a bore formed therein, a stopper provided on one end of the tubular body and having a conical leading edge, a flange provided on the tubular body at a location close to the stopper, and a wall provided on the other end of the tubular body to close the bore. This arrangement can carry out an operation for connecting a drain hose in effective fashion, and offer an advantage in that the number of required parts is reduced. The drain pipe joint may be formed from an elastic material. The drain pipe joint can work as a joint and a blind plug in a single use, offering an advantage in that the number of required parts is reduced. The drain pipe joint may have a cutting groove provided thereon at a location close to the wall. The single drain pipe joint can work as a joint and a blind plug in a single use, offering an advantage in that the number of required parts is reduced. The wall of the drain pipe joint may be made of a breakable material so that the wall can be broken when the joint is used for drainage. The drain pipe joint can work as a joint and a blind plug in a single use, offering advantages in that the number of required parts is reduced and that an operation for connecting a connecting hose can be simplified. The drain pan may include an additional drainage with a drain pipe joint inserted thereinto, and the drain pipe joint may comprise a tubular body with a bore formed therein, a stopper provided on one end of the tubular body and having a conical leading edge, a flange provided on the tubular body at a location close to the stopper, and a wall provided on the one end of the tubular body to close the bore. This arrangement can attach the drain pipe joint to the drain pan from inside the drain pan, simplifying the attaching operation. The drain pipe joint may have a connecting portion with a connecting hose formed so as to have a larger outer diameter than an inner diameter of the connecting hose. This arrangement can ensure that the connecting hose is connected to the joint after the wall has been broken. The drain pipe joint is configured so as to be attachable to the drain pan from inside the drain pan. This arrangement can offer an advantage in that the attaching operation in a narrow space is simplified. In the drawings: Figure 1 is a cross-sectional view of essential portions of the air conditioner according to a first embodiment of the present invention; Figure 2 is a cross-sectional view of essential portions of the air conditioner according to the first embodiment; Figure 3 is a cross-sectional view of essential portions of the air conditioner according to the first embodiment; Figure 4 is a front view of essential portions of the air conditioner according to the first embodiment as viewed from the direction indicated by an arrow A in Figure 3; Figure 5 is a cross-sectional view of essential portions of the air conditioner according to a second embodiment of the present invention; Figure 6 is a cross-sectional view of essential portions of the air conditioner according to a third embodiment of the present invention; Figure 7 is a cross-sectional view of essential portions of the air conditioner according to a fourth embodiment of the present invention; Figure 8 is a cross-sectional view of essential portions of the air conditioner according to a fifth embodiment of the present invention; Figure 9 is a cross-sectional view of essential portions of the air conditioner according to the fifth embodiment; Figure 10 is a cross-sectional view of essential portions of the air conditioner according to a sixth embodiment of the present invention; Figure 11 is a cross-sectional view of essential portions of the air conditioner according to the sixth embodiment; Figure 12 is a cross-sectional view of the drain pipe joint for an additional drainage in a drain pan according to a seventh embodiment of the present invention; Figure 13 is a cross-sectional view of the drain pipe joint according to the seventh embodiment, wherein the joint is cut at a line A indicated in Figure 12; Figure 14 is a cross-sectional view of the drain pipe joint according to the seventh embodiment, wherein the joint is used as a plug; Figure 15 is a cross-sectional view of the drain pipe joint according to the seventh embodiment, wherein the joint is used for drainage; Figure 16 is a cross-sectional view of the drain pipe joint according to an eighth embodiment of the present invention; Figures 17(a) and (b) are cross-sectional views of the drain pipe joint according to a ninth embodiment of the present invention; Figure 18 is a cross-sectional view of the drain pipe joint according to the seventh embodiment to show how to attach the joint into the drain pan; Figure 19 is a cross-sectional view of the drain pipe joint according to a tenth embodiment of the present invention; Figure 20 is a cross-sectional view of the drain pipe joint according to the tenth embodiment to show how to attach the joint into the drain pan; Figure 21 is a cross-sectional view of the drain pipe joint according to an eleventh embodiment of the present invention; Figure 22 is a cross-sectional view of the drain pipe joint according to a twelfth embodiment of the present invention; Figure 23 is a cross-sectional view of the drain pipe joint according to the twelfth embodiment, wherein the joint is used for drainage; Figure 24 is a cross-sectional view of a part of a conventional air conditioner; Figure 25 is an exploded cross-sectional view of a conventional drain pipe plug arrangement; Figure 26 is an exploded cross-sectional view of another conventional drain pipe plug arrangement; Figure 27 is a cross-sectional view of a conventional drain pipe joint to show how to attach the joint into the drain pan; Figure 28 is a perspective view of the conventional drain pipe joint; Figure 29 is a cross-sectional view of a conventional blind plug to show how to attach the plug into the drain pan; Figure 30 is a perspective view of the conventional blind plug; Figure 31 is a cross-sectional view of the drain pipe joint, wherein the joint is used for drainage; and Figure 32 is a perspective view wherein the conventional drain pipe joint is applied to an air conditioner. Now, preferred embodiments of the present invention will be described in detail, referring to the accompanying drawing. EMBODIMENT 1 A first embodiment of the present invention will be explained, referring to the drawings. In Figures 1 through 4 is shown the first embodiment. In Figure 1 is shown a cross-sectional view of a wall-hung air conditioner as a whole, in Figures 2 and 3 are shown cross-sectional views of essential portions of the air conditioner, and in Figure 4 is shown a front view of essential portions of the embodiment. In these Figures, reference numeral 1 designates a heat exchanger, reference numeral 2 designates a flap, reference numeral 4 designates a drain pan, reference numeral 5 designates drain water that has moved from the heat exchanger 1 and has been stored in the drain pan, reference numeral 3 designates an outlet nozzle member that is fitted on the drain pan to be combined therewith, reference numeral 8 designates drain water that has been stored in a hollow space 7 due to vapor condensation, reference numeral 9 designates a first drainage as a drain pan drainage for the drain water 5 in the drain pan 4, and reference numeral 10 designates a second drainage as a hollow space drainage that is provided so as to be concentric with the first drainage 9 and drains the drain water 8 in the hollow space. The drain water in the drain pan and the hollow space is retrieved by a drain hose 11. The function of the device according to this embodiment will be explained. An outlet nozzle of the air conditioner is provided by the drain pan 4 and the outlet nozzle member 3 fitted on and combined with the drain pan. The drain water 5 that has been stored in the drain pan 4 is drained through the first drainage 9. Since the hollow space 7 defined by the drain pan 4 and the outlet nozzle member 3 has air leaked thereinto through a gap 6 between the drain pan and the outlet nozzle member, the drain water 8 is deposited on the inner wall of the hollow space 7, and the drain water is stored in the hollow space 7. As shown in Figure 4, the second drainage 10 for the drain water 8 in the hollow space 7 is provided so as to be concentric with the first drainage 9 to retrieve the drain water 8 in the hollow space 7 together with the drain water 5 in the drain pan through the single drain hose 11, preventing the drain water 8 in the hollow space 7 from overflowing the hollow space or dropping out of the hollow space. Since no foamed material or a similar material is not used, it is possible to disengage the outlet nozzle member 3 from the drain pan 4 easily, and therefore to carry out separation of the parts simply for disposal. Although the second drainage 10 for the drain water 8 in the hollow space 7 is shown to be concentric with the first drainage 9 for the drain pan 4, the second drainage is not limited to the concentric fashion as long as the second drainage is located close to the first drainage 9. According to this embodiment, the hollow space can be provided so as to offer a required thermal insulation by the two parts. No use of a thermal insulation material eliminates the problem of dew drops due to peeling of a thermal insulation material, and drainage treatment can be carried out in more reliable fashion. This embodiment can offer an advantage in that the device can be provided at a low cost. The disengagement of the parts is easy to improve the separation of the parts for disposal. EMBODIMENT 2 In Figure 5 is shown a cross-sectional view of essential portions of the air conditioner according to a second embodiment. In this Figure, reference numeral 12 designates a trough-shaped guide, which is provided on a leading edge of the first drainage 9 for the drain water 5 in the drain pan 4. The trough-shaped guide 12 can be provided to the leading edge of the first drainage 9 for the drain water 5 according to the first embodiment to reliably direct the drain water 5 to the drain hose 11 without allowing the drain water 5 to flow into the hollow space 7 even if the leading edges of the first and second drainages 9 and 10 are located at the same projecting position. EMBODIMENT 3 In Figure 6 is shown a cross-sectional view of essential portions of the air conditioner according to a third embodiment of the present invention. As shown in this Figure, a rubber plug 13 is used to clog the first drainage 9 and the second drainage 10 that are not in use. Air conditioners are usually provided with drainages at two locations. One of the drainage is ready for use on installation, and the drainage that is not in use is clogged with a rubber plug. The rubber plug 13 can be provided with concentric flanges 14 and 15 to clog the respective drainages 9 and 10, thereby clogging both drainages with the single rubber plug. EMBODIMENT 4 In Figure 7 is shown a cross-sectional view of essential portion of the air conditioner according to a fourth embodiment of the present invention. In this Figure, reference numeral 16 designates a nozzle fixing portion, which is used to fix the drain pan 4 thereto. The outlet nozzle member 3 and the drain pan 4 are made of different materials, respectively. The drain pan 4 is made of polypropylene, allowing the engagement with other parts to be carried out at the presence of the polypropylene material. By the presence of the polypropylene material, almost no creak, which is normally produced between parts due to thermal shrinkage, is generated. EMBODIMENT 5 In Figures 8 and 9 are shown a perspective view and a cross-sectional view of essential portions of the air conditioner according to a fifth embodiment of the present invention. In these Figures, reference numeral 17 designates a rib that is provided on the drain pan 4, reference numeral 18 designates projections in a triangular cross-sectional shape, reference numeral 19 designates an insulating member, reference numeral 20 designates a plurality of angular holes formed in the insulating member 19, and reference numeral 21 designates slots. The insulating member 19, which separates a primary side and a secondary side at a lower end of the heat exchanger 1, has the plural angular holes 20 and the plural slots 21 formed therein. The single rib 17 is provided on a side of the drain pan 4 close to the heat exchanger, and the rib has both lateral sides alternately provided with the projections 18 in a triangular cross-sectional shape. The projections 18 are zigzag fitted into the angular holes 20 in the insulating member 19. Since it is possible to remove the insulating member 19 easily for disposal, the separation of parts can be improved. In the conventional air conditioner, the insulating member for separating a primary side and a secondary side at a lower end of the heat exchanger is fixed to the drain pan 4 by an adhesive. EMBODIMENT 6 In Figures 10 and 11 are shown a perspective view and a cross-sectional view of essential portions of the air conditioner according to a six embodiment of the present invention. In this Figure, reference numeral 22 designates an insulating member, and reference numeral 23 designates ribs. The two ribs 23 are provided on the drain pan 4, and one of the ribs has a lateral side close to the other rib provided with a plurality of projections 18 in a triangular cross-sectional shape. The insulating member 22 is fitted between and fixed to the ribs 23, having the projections 18 received in angular holes 20 formed in the insulating member. As in the fifth embodiment, it is possible to remove the insulating member 22 easily for disposal, thus improving separation of the parts. In the explanation of the third embodiment, it has been stated that the drain pan of an air conditioner is usually provided with drainages at two locations. In the case wherein the drain pan includes an additional drainage in addition to the drainage 9, drain pipe joints according to the following embodiment are appropriate to the additional drainage. EMBODIMENT 7 Now, the drainage for the drain pan according to a seventh embodiment of the present invention will be explained, referring to the drawings. In Figure 12 is shown a cross-sectional view of the drain pipe joint according to the seventh embodiment, in Figure 13 is shown a cross-sectional view of the drain pipe joint that is cut at a line A shown in Figure 12, in Figure 14 is shown a cross-sectional view to explain how the drain pipe joint is used as a drain plug, and in Figure 15 is shown a cross-sectional view to explain how the drain pan drainage according to the seventh embodiment is used. In these Figures, reference numeral 101 designates the drain pan, reference numeral 102 designates the drain pipe joint, which is inserted into and engaged with a hole 101a formed in the drain pan 101, and which is molded from an elastic material, such as rubber, reference numeral 102a designates a flange, which is provided on the drain pipe joint 102, reference numeral 102b designates a tubular body of the drain pipe joint 102, reference numeral 102c designates a stopper, which is provide on an end of the tubular body and has a conical leading edge, reference numeral 102e designates a bore in the drain pipe joint 102, and reference numeral 102f designates a wall, which is provided on the tubular body at the end remote from the stopper 102c. The function of the drain pipe joint will be explained, referring to Figures 12 through 15. The drain pipe joint 102 is engaged with the hole 101a formed in the drain pan 101. Since the drain pipe joint 102 has the wall 102f provided at the end remote from the stopper, the joint performs a clogging function to prevent drain water from leaking out of the drain pan as shown in Figure 14, wherein the joint 102 is used as a blind plug. If the drain pipe joint 102 is used as a joint, the drain pipe joint is cut at the position shown in the line A to cut off the wall 102f from the tubular body as shown in Figure 13, and a drain hose 104 is connected to the cut end. EMBODIMENT 8 Although the wall 102f is cut at the position indicated by the line A of Figure 12 in the seventh embodiment, the drain pipe joint 102 has a groove 105 provided at an outer periphery thereon at a portion close to the wall 102f as a hose connecting portion to clarify the cutting position, allowing the wall to be accurately separated in an eighth embodiment shown in Figure 16. EMBODIMENT 9 Although the joint has the end close to the wall cut and separated in the seventh and eighth embodiment, the wall 102f of the drain pipe joint 102 may be broken by a sharp instrument 106 to form a broken hole 107 as shown in Figures 17(a) and (b), offering a similar effect. EMBODIMENT 10 Although the drain pipe joint 102 according to the seventh through ninth embodiment is inserted into the drain pan 101 from an outer side of the drain pan as shown in Figure 18, the end of the drain pipe joint 102 with the wall 102f is formed in a sharp angular shape and the flange 102a has a side provided with a tapered surface 102g as shown in Figure 19. The drain pipe joint 102 is engaged with the hole in the drain pan 101 from an inner side of the drain pan as shown in Figure 20. EMBODIMENT 11 In Figure 21 is shown the drain pipe joint for the additional drainage according to an eleventh embodiment, wherein the wall 102f of the joint 102 has an outer diameter A formed so as to be larger than the inner diameter B of the connecting hose 104. EMBODIMENT 12 In Figures 22 and 23 is shown the drain pipe joint for the additional drainage according to a twelfth embodiment of the present invention. Reference numeral 102h designate a wall, which is provided on the drain pipe joint 102 at the end with the stopper 102 so as to close the bore 102e at the leading edge of the stopper 102c. When the drain pipe joint according to the twelfth embodiment is used as a drain pipe, the wall 102h is broken by an instrument to form a through hole 108, allowing drain water to be drained.

Claims: An air conditioner indoor unit comprising: a heat exchanger (1); a fan; a drain pan (4) provided under the heat exchanger (1), the drain pan (4) being for retrieving drain water condensed on the heat exchanger (1); and a drain pan drainage (9) formed in the drain pan (4), the drain pan drainage (9) being for draining drain water stored in the drain pan (4); characterised in that the air conditioner comprises: an outlet nozzle member (3) for blowing off air supplied by the fan, the outlet nozzle member (3) being provided under the drain pan (4) and delimiting a hollow space (7) between the drain pan (4) and the outlet nozzle member (3); a hollow space drainage (10) formed in the outlet nozzle member (3) at a location close to the drain pan drainage (9), the hollow space drainage (10) being for draining drain water stored the hollow space (7); and a drain hose (11) connected to the drain pan drainage (9) and the hollow space drainage (10). An indoor unit according to Claim 1, wherein the drain pan drainage (9) and the hollow space drainage (10) are provided in concentric fashion so that the drain pan drainage (9) is located inside the hollow space drainage (10). An indoor unit according to Claim 2, wherein the drain pan drainage (9) has a leading edge provided with a trough-shaped guide (12). An indoor unit according to claim 2, wherein the drain pan drainage (9) and the hollow space drainage (10) are combined so as to provide a pair of drainages, and a rubber plug (13) with dual concentric flanges (14, 15) is provided on the pair of drainages when the drainages are not in use. An indoor unit according to claim 1, wherein the outlet nozzle member (3) and the drain pan (4) are made of different materials, and the drain pan (4) is made of polypropylene resin. An indoor unit according to claim 1, wherein the heat exchanger (1) has a lower end provided with an insulation member (19) to separate a space under the heat exchanger (1) into a primary side and a secondary side, the drain pan (4) is provided with a rib (17), and the insulation member (19) is engaged with the rib (17). An indoor unit according to claim 6, wherein the insulation member (19) has angular holes (20) and slots (21) formed therein, the rib (17) has projections (18) in a triangular shape alternately provided on both lateral sides thereof, and the angular holes (20) receive the projections (18) in alternate fashion. An indoor unit according to claim 6, wherein the drain pan (4) is provided with two ribs (23), one of the ribs has a lateral side facing the other rib provided with projections in a triangular shape, the insulation member (19) has angular holes (20) formed therein, and the insulation member (19) is inserted into a gap between the ribs (23) with the ribs (23) fitted into the angular holes (20). An indoor unit according to claim 1, wherein the drain pan (4) includes an additional drainage, and the additional drainage has a drain pipe joint (102) inserted thereinto, wherein the drain pipe joint (102) comprises a tubular body (102b) with a bore (102e) formed therein, a stopper (102c) provided on one end of the tubular body (102b) and having a conical leading edge, a flange (102a) provided on the tubular body at a location close to the stopper (102c), and a wall (102f) provided on the other end of the tubular body (102b) to close the bore (102e). An indoor unit according to claim 9, wherein the drain pipe joint (102) is formed from an elastic material. An indoor unit according to claim 9, wherein the drain pipe joint (102) has a cutting groove provided thereon at a location close to the wall (102f). An indoor unit according to claim 9, wherein the wall (102f) is made of a breakable material so that the wall (102f) can be broken when the joint (102) is used for drainage. An indoor unit according to claim 1, wherein the drain pan (4) includes an additional drainage, and the additional drainage has a drain pipe joint (102) inserted thereinto, wherein the drain pipe joint (102) comprises a tubular body (102b) with a bore (102e) formed therein, a stopper (102c) provided on one end of the tubular body (102b) and having a conical leading edge, a flange (102a) provided on the tubular body (102b) at a location close to the stopper (102c) and a wall (102f) provided on the one end of the tubular body (102b) to close the bore (102e). An indoor unit according to claim 9, wherein the drain pipe joint (102) has a connecting portion with a connecting hose formed so as to have a larger outer diameter than an inner diameter of the connecting hose. An indoor unit according to claim 9, wherein the drain pipe joint (102) is configured so as to be attachable to the drain pan (4) from inside the drain pan (4).

Inventors: ENDO TERUYOSHI, KAWAKAMI TAMAKI, MATSUSHITA KUNIO, TANIKAWA YOSHINORI, ENDO, TERUYOSHI, KAWAKAMI, TAMAKI, MATSUSHITA, KUNIO, TANIKAWA, YOSHINORI, Endo, Teruyoshi, Mitsubishi Elec. Eng. Co., Ltd., Kawakami, Tamaki, Mitsubishi Elec. Eng. Co., Ltd., Matsushita, Kunio, Mitsubishi Elec.Eng. Co.Ltd., Tanikawa, Yoshinori, Mitsubishi Elec.Eng. Co.Ltd.
Applicants: MITSUBISHI ELECTRIC CORP, MITSUBISHI DENKI KABUSHIKI KAISHA
Application year: 1999
Main classification: F24F13
IPC codes: F24F13, F24F1