P/00/01Il Regulation 3.2 AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Invention Title: Indoor unit of air conditioning apparatus The following statement is a full description of this invention, including the best method of performing it known to us: [Name of Document] DESCRIPTION [Title of Invention] INDOOR UNIT OF AIR CONDITIONING APPARATUS [Technical Field] 5 [0001] The present invention relates to an indoor unit of an air conditioning apparatus, and more specifically to, for example, a built-in ceiling mounted indoor unit to be installed in the ceiling of a room. 10 [Background Art) [0002) A separate type air conditioning apparatus including a plurality of units provided has long been used in cases where an integral air conditioning apparatus cannot be 15 brought in or installed due to the limited entrance or installation space for air conditioning apparatuses. For example, in an automotive air conditioning apparatus, there has been proposed a unit coupling structure due to the necessity for installation in a limited 20 installation space, "wherein, in an automotive air conditioning apparatus, projecting portions 10a, 12a extending in the axial direction of a duct are formed on two adjacent sides on end portions 10b, 12b of an intake unit 10 and a heater unit 12 which are connected at such end 25 portions, and projecting portions extending axially are formed on two adjacent sides on both ends 11b, 11b of a cooler unit 11 in such a manner that such projecting la portions cooperate with the projecting portions 10a, 12a to form a duct when the unit 11 is moved horizontally from the passenger compartment side and inserted into a gap between the unit 10 and the unit 12, and projections 14 extending vertically from ends of 5 the projecting portions are formed, and a cone-shaped guide pin 16 is provided on either one of the projections 14 which are face-to face with each other and a joint portion 17 into which the cone shaped guide pin 16 is inserted is provided on the other" (see Patent Document 1). 10 (Citation List] [Patent Literature] [0003] [Patent Document 1] Japanese unexamined Patent Application Publication No. 10-100641 (ABSTRACT, Fig. 1) 15 Reference to any prior art in the specification is not, and should not be taken as, an acknowledgment or any form of suggestion that this prior art forms part of the common general knowledge in Australia or any other jurisdiction or that this prior art could reasonably be expected to be ascertained, 20 understood and regarded as relevant by a person skilled in the art. [Summary of Invention] [Technical Problem] [0004] 25 In not only automotive air conditioning apparatuses but also in built-in ceiling mounted indoor units to be installed in the ceiling, an indoor unit may be divided into a heat exchanger unit which houses an indoor unit heat exchanger therein and a blower unit which houses a blower therein in cases where an ordinary 30 indoor unit cannot introduced into the ceiling due to a limited entrance provided in the ceiling. In such a case, a prior-art projection (for example, a projection 14 in Patent Document 2 1) must be provided in a coupling side surface of each unit in order to couple together the heat exchanger unit and the blower unit. (0005) 5 Fig. 15 is an explanatory diagram showing an example of a coupling structure for units of a conventional built-in ceiling mounted indoor unit. Figs. 15(a), 15(b), and 15(c) show three coupling structures. Figs. 15(a) and 15(b) show a plan view, while Fig. 15(c) shows a side view. An arrow 10 of Fig. 15 indicates a position at which screws are tightened and a direction in which screws are tightened. For example, in a conventional indoor unit shown in Fig. 15(a), a flange 121 must be formed in a coupling side surface of the blower unit 120 and the enclosure of the heat 15 exchanger unit 110 must be formed larger than that of the blower unit 120, thereby screwing the flange 121 to the heat exchanger unit 110 is required for purposes of coupling the units. Also, in a conventional indoor unit shown in Fig. 20 15(b), for example, flanges 111, 121 are provided respectively in coupling side surfaces of the heat exchanger unit 110 and the blower unit 120, thereby screwing the flanges 111, 121 to each other is required for purposes of coupling the units. 25 [0006] 3 However, coupling the heat exchanger unit 110 and the blower unit 120 using the above-described structure causes a problem that an increase in size of the indoor unit results. In order to avoid an increase in size of the indoor unit, 5 such coupling operation by screwing must be performed inside the enclosure of the heat exchanger unit 110 and the blower unit 120, as shown in Fig. 15(c). For this reason, in order to couple together the heat exchanger unit 110 and the blower unit 120, the upper panel 122 and the bottom panel 123 of the blower unit 120 10 must be removed before such coupling operation is performed; which inevitably results in a difficult operation in the ceiling. Consequently, the above-described coupling structure results in a difficulty in coupling operation. [0007) 15 The present invention has been achieved in light of the foregoing and an object thereof is to provide an indoor unit of an air conditioning apparatus, in which a coupling structure can prevent an increase in indoor unit size, allowing a heat exchanger unit and a blower unit to be easily coupled together, or at least 20 to provide the public with a useful alternative. (Solution to Problem] [0008] An indoor unit of an air conditioning apparatus according to the present invention includes a heat exchanger unit that houses 25 an indoor unit heat exchanger therein and a blower unit that houses a blower therein, wherein the heat 4 exchanger unit and the blower unit are coupled together so as to be disposed laterally side by side, wherein, when the heat exchanger unit and the blower unit are installed, a first side surface formed on one of the heat exchanger unit 5 and the blower unit faces a second side surface formed on the other of the heat exchanger unit and the blower unit with a sealing member therebetween, wherein a first guide extending toward the second side surface is provided on the lower portion of the first side surface in such a manner 10 that a gap between the first guide and the first side surface expands upward, wherein a protrusion is provided on the second side surface, the protrusion being inserted into the gap formed between the first guide and the first side surface, wherein a second guide extending toward the first 15 side surface is provided on the second side surface, wherein a first opening, into which the second guide is inserted, is formed on the first side surface, the first opening being adapted to cause the heat exchanger unit to be positioned with regard to the blower unit in a breadthwise direction 20 when the second guide is inserted therethrough, wherein a coupling member is provided on the upper portion of the second side surface, the coupling member having a through hole through which a screw is inserted provided therein and extending toward the first side surface in such a manner 25 that a gap between the coupling member and the second side surface expands upward, and wherein a coupling surface is formed on the first side surface, the coupling surface 5 facing the coupling member and having a threaded hole into which a screw inserted through the through hole is screwed. [Advantageous Effects of Invention] [0009] 5 According to the present invention, the protrusion is inserted into the gap formed between the first side surface and the first guide, thereby causing the heat exchanger unit and the blower unit to be temporarily secured at their lower portions to each other. At this time, the heat exchanger 10 unit is positioned with regard to the blower unit when the second guide is inserted into the first opening. Then, a screw is inserted through a through hole of the coupling member extending from the first side surface and is screwed into a threaded hole formed in the second side surface, 15 thereby allowing the heat exchanger unit and the blower unit to be coupled together. Accordingly, such coupling structure can prevent an increase in indoor unit size, which results in the indoor unit of the air conditioning apparatus which allows the heat exchanger unit and the blower unit to 20 be easily coupled together. The sealing member is held between the first side surface and the second side surface due to the weight of the unit in which the second side surface is formed. This ensures that sealing performance is provided between the 25 heat exchanger unit and the blower unit. [Brief Description of Drawings) [0010) 6 [Fig. 1] Fig. 1 is a perspective view showing an indoor unit 100 in an installed state according to Embodiment 1 of the present invention. [Fig. 2] Fig. 2 is a disassembled perspective view of an 5 indoor unit 100 according to Embodiment 1 of the present invention. [Fig. 3] Fig. 3 is a side view showing an indoor unit 100 in an installed state according to Embodiment 1 of the present invention. 10 [Fig. 4] Fig. 4 is a plan view showing an indoor unit 100 in an installed state according to Embodiment 1 of the present invention. (Fig. 5] Fig. 5 is an explanatory diagram showing a coupling method for a heat exchanger unit 10 and a blower 15 unit 50 of an indoor unit 100 according to Embodiment 1 of the present invention. [Fig. 6] Fig. 6 is a side view showing another example (indoor unit 101) of an indoor unit according to Embodiment 1 of the present invention. 20 [Fig. 7) Fig. 7 is a side view showing an assembling method for an indoor unit 100 according to Embodiment 1 of the present invention. (Fig. 8] Fig. 8 is a perspective view showing an indoor unit 100 according to Embodiment 1 of the present invention, 25 which is packaged after assembled. 7 [Fig. 9) Fig. 9 is a disassembled perspective view showing an indoor unit 102 according to Embodiment 2 of the present invention in an assembled state. (Fig. 10] Fig. 10 is a disassembled perspective view 5 showing a state in which an electrical component box 80 is disposed at portion P of Fig. 9. [Fig. 11] Fig. 11 is a view as seen from the arrowed line Y of Fig. 10. (Fig. 12] Fig. 12 a side view showing an example (indoor 10 unit 104) of an indoor unit according to Embodiment 3 of the present invention. [Fig. 13] Fig. 13 is a perspective view showing another example (indoor unit 104) of an indoor unit according to Embodiment 3 of the present invention. 15 [Fig. 14] Fig. 14 is an explanatory diagram showing a disassembling method for an indoor unit 104 shown in Fig. 13. [Fig. 15] Fig. 15 is an explanatory diagram showing an example of a coupling structure for units of a conventional 20 built-in ceiling mounted indoor unit. [Description of Embodiments] [0011] Embodiment 1 Fig. 1 is a perspective view showing an indoor unit 25 (hereinafter referred to as an indoor unit 100) in an installed state according to Embodiment 1 of the present invention. Fig. 2 is a disassembled perspective view of the 8 indoor unit 100. Fig. 3 is a side view showing the indoor unit 100 in an installed state. Fig. 4 is a plan view showing the indoor unit 100 in an installed state. Fig. 1 is a see-through view showing the inside of the indoor unit 5 100 for ease of understanding the inner structure of the indoor unit 100. Fig. 4 is a view in which a coupling member 70 is omitted for the purpose of showing the shape of a guide 60. The indoor unit 100 according to Embodiment 1 will be 10 described below using the attached drawings. The following description is made with respect to the direction in which the indoor unit 100 is installed. The attached drawings including Figs. 1 through 4 may be different from one another in terms of the sizes and shapes of components. 15 (0012] The indoor unit 100 of the air conditioning apparatus according to Embodiment 1 has a heat exchanger unit 10 and a blower unit 50 provided separately. The indoor unit 100 is, for example, a built-in indoor unit mounted in the ceiling 20 of a room (on the upper face of the ceiling 6). With the indoor unit 100 installed in the ceiling, the heat exchanger unit 10 and the blower unit 50 are coupled with each other, while the heat exchanger unit 10 and the blower unit 50 are disposed laterally side by side. 25 10013] The heat exchanger unit 10 (more specifically an enclosure 11) is substantially cuboid. An indoor unit heat 9 exchanger 2 and a drain pan 3 for collecting a drain generated from the indoor unit heat exchanger 2 are housed in the heat exchanger unit 10 (more specifically the enclosure 11). In the enclosure 11 of the heat exchanger 5 unit 10, a substantially rectangular-shaped opening 13 through which air supplied from the blower unit 50 is drawn into the heat exchanger unit 10 is formed in the coupling side surface 12 (side surface facing a coupling side surface 52 of the blower unit 50 to be described later). Also, a 10 sealing member 40 is provided on the circumference of the opening 13. A guide 60 of the blower unit 50 to be described later is inserted through the opening 13. In other words, the opening 13 corresponds to the first opening of the present invention, while the coupling side surface 12 15 corresponds to the first side surface of the present invention. [0014] A guide 20 is provided on the side surface 12 of the enclosure 11. Also, a coupling surface 30 is formed on the 20 side surface 12 of the enclosure 11. The guide 20 corresponds to the first guide of the present invention. The guide 20 is, for example, a plate-like member and is provided at the lower portion of the coupling side surface 12. The guide 20 extends obliquely upward toward 25 the blower unit 50. This causes a substantially V-shaped gap 21 to be formed between the guide 20 and the coupling side surface 12 in the longitudinal section along the 10 coupling direction (right to left direction in Fig. 3). In other words, the gap 21 expands to a larger degree at the upper positions within a space defined by the guide 20 and the coupling side surface 12. 5 [0015] The coupling surface 30 is formed on the upper portion of the coupling side surface 12. The coupling surface 30 extends obliquely downward toward the blower unit 50 in the longitudinal section along the coupling direction (namely, 10 right to left direction in Fig. 3). The coupling surface 30 is slanted so as to face (and be substantially in parallel with) a coupling member 70 of the blower unit 50 to be described later. The coupling surface 30 has threaded holes 31 formed at the positions thereof which are aligned with 15 through holes 72 on the coupling member 70 to be described later. The threaded holes 31 can be provided in any number. In Embodiment 1, the plurality of threaded holes 31 are formed. [0016] 20 In the enclosure 11 of the heat exchanger unit 10, an outlet opening 14 through which air subjected to heat exchange with the indoor unit heat exchanger 2 is blown out is formed in the opposite surface of the coupling side surface 12. This is just one example of a location where 25 the outlet opening 14 is provided. For example, the outlet opening 14 may be provided at the bottom of the enclosure 11. 11 [0017] The blower unit 50 (more specifically the enclosure 51) is substantially cuboid. A blower 4 for supplying air to the indoor unit heat exchanger 2 in the heat exchanger unit 5 10 and a motor 5 for driving the blower 4 are housed in the blower unit 50 (more specifically the enclosure 51). In an enclosure 51 of the blower unit 50, a substantially rectangular-shaped opening 53 through which air blown out by the blower 4 is supplied to the indoor unit heat exchanger 2 10 is formed in a coupling side surface 52 (side surface facing the coupling side surface 12 of the heat exchanger unit 10). [0018) A protrusion 55, a guide 60, and a coupling member 70 are provided in the coupling side surface 52 of the 15 enclosure 51. The coupling side surface 52 corresponds to the second side surface of the present invention, while the guide 60 corresponds to the second guide of the present invention. The protrusion 55 extends in the breadthwise direction 20 (direction perpendicular to the side view in Fig. 3 and parallel to the plan view in Fig. 4) of the enclosure 51 and is provided on the lower portion of the coupling side surface 52. More specifically, the coupling side surface 52 has a recess formed in the lower portion thereof in the 25 longitudinal section along the coupling direction, and the protrusion 55 extends from the recess toward the heat exchanger unit 10. In the longitudinal section along the 12 coupling direction, the protrusion 55 has substantially the same external shape as the gap 21. (0019] The guide 60 is formed by folding, for example, a 5 plate-like member. In the longitudinal section along the coupling direction (right to left direction in Fig. 3), the guide 60 is substantially V-shaped with its lower surface 61 and upper surface 62 extending laterally. In other words, the upper surface 62 of the guide 60 extends obliquely 10 downward toward the heat exchanger unit 10. The guide 60 is positioned somewhat downward of the upper portion of the coupling side surface 52. More specifically, the upper end (more specifically the upper end of a protrusion extending toward the heat exchanger unit 10) of the guide 60 is 15 configured to be somewhat lower than that of the opening 13 formed in the heat exchanger unit 10. [0020] As shown in Fig. 4, two guides 60 (guide 60a and guide 60b) are provided in Embodiment 1. The guide 60 has a 20 somewhat smaller breadthwise dimension than the opening 13. In other words, the dimension between a breadthwise front side end (lower end of guide 60a in Fig. 4) of the guide 60a and a breadthwise rear side end (upper end of guide 60b in Fig. 4) of the guide 60b is somewhat smaller than the 25 breadthwise dimension of the opening 13. [0021] 13 The guide 60 has a tapered portion 63 formed at each of breadthwise external ends thereof. In other words, a tapered portion 63 is formed at each of a breadthwise front side end of the guide 60a and a breadthwise rear side end of 5 the guide 60b. The tapered portion 63 performs the function of guiding the guide 60 to the inside of the opening 13 of the heat exchanger unit 10 when the heat exchanger unit 10 is positioned with regard to the blower unit 50 in the breadthwise direction. 10 [0022] If an opening which is the first opening according to the present invention is provided separately in the coupling side surface 12 of the heat exchanger unit 10 (in cases where an opening other than the opening 13 is treated as the 15 first opening), the tapered portion 63 may be provided at each of an inner end of the guide 60a (upper end of the guide 60a in Fig. 4) and an inner end of the guide 60b (lower end of the guide 60b in Fig. 4). To accomplish this, an opening which is the first opening may be provided in 20 such a manner that a small gap is produced between the inner ends of the guide 60a and the guide 60b and the ends of the opening which is the first opening when the heat exchanger unit 10 is coupled with the blower unit 50. In this case, again the tapered portion 63 performs the function of 25 guiding the guide 60 to the inside of the opening which is the first opening in the heat exchanger unit 10 when the 14 heat exchanger unit 10 is positioned with regard to the blower unit 50 in the breadthwise direction. [0023] The guide 60a and the guide 60b may be formed in an 5 integral manner, namely, may be formed as one guide 60 which extends breadthwise. In Embodiment 1, the guide 60 is divided into two guides in order to reduce an area which is occupied by the guide 60 in the opening 13 (or in order to enlarge a passage from the blower unit 50 to the heat 10 exchanger unit 10). [0024] The coupling member 70 is, for example, a plate-like member and is formed on the upper portion of the coupling side surface 52. The coupling member 70 extends obliquely 15 upward toward the heat exchanger unit 10. This causes a substantially V-shaped gap 71 to be formed between the coupling member 70 and the coupling side surface 52 in the longitudinal section along the coupling direction. In other words, the gap 71 expands to a larger degree at the upper 20 positions within a space defined by the coupling member 70 and the coupling side surface 52. The coupling member 70 is slanted so as to face (and be substantially in parallel to) the coupling surface 30 of the heat exchanger unit 10. The coupling member 70 has the through holes 72 through which 25 screws are inserted formed at the positions thereof which are aligned with the threaded holes 31 on the coupling member 30. In Embodiment 1, the number of the through holes 15 72 provided is the same as that of the threaded holes 31 provided. [00251 In the enclosure 51 of the blower unit 50, an inlet 5 opening 54 is formed in the opposite surface of the coupling side surface 52. [00261 The indoor unit 100 according to Embodiment 1 has an electrical component box 80 in which electrical components 10 used to control the motor 5 are housed. The electrical component box 80 is substantially cuboid and is provided on a side surface adjacent to the coupling side surface 52 of the blower unit 50. [0027) 15 A method for coupling the heat exchanger unit 10 and the blower unit 50 will now be described below. Fig. 5 is an explanatory diagram showing a coupling method for coupling the heat exchanger unit 10 and the blower unit 50 of the indoor unit 100 according to 20 Embodiment 1 of the present invention. Fig. 5 is a side view of the indoor unit 100. [00281 If the indoor unit 100 is installed in, for example, the ceiling (upper surface of the ceiling 6), the heat 25 exchanger unit 10 is first installed on a desired place. Then the blower unit 50 is lifted up by taking hold of, for example, a handle 56, as indicated by an arrow A, and the 16 end of the protrusion 55 of the blower unit 50 is placed on the end of the guide 20 of the heat exchanger unit 10. This causes the blower unit 50 to move on the guide 20 with the protrusion 55 sliding along the guide 20 due to the blower 5 unit's own weight (and, in some cases, with the help of an operator's power exerted in the coupling direction). At this time, the guide 60 of the blower unit 50 is guided along the tapered portion 63 and inserted through the opening 13 of the heat exchanger unit 10, thereby allowing 10 the blower unit 50 to be easily positioned with regard to the heat exchanger unit 10 in the breadthwise direction. Consequently, as shown in Fig. 5(b), the coupling side surface 12 of the heat exchanger unit 10 comes face-to-face with the coupling side surface 52 of the blower unit 50. 15 [0029] In the state shown in Fig. 5(b), the protrusion 55 is inserted into the guide 20, causing the heat exchanger unit 10 and the blower unit 50 to be temporarily secured to each other at their lower portions. This also causes the 20 coupling side surface 12 of the heat exchanger unit 10 and the coupling side surface 52 of the blower unit 50 to hold the sealing member 40 therebetween, ensuring that the coupling portions are sealed. Furthermore, this causes the threaded holes 31 formed on the coupling surface 30 of the 25 heat exchanger unit 10 to be aligned with the through holes 72 formed on the coupling member 70 of the blower unit 50. 17 Finally, screws are inserted through the through holes 72 into the threaded holes 31 and screwed in, thereby allowing the heat exchanger unit 10 and the blower unit 50 to be coupled together. At this time, the level of the 5 position at which the coupling surface 30 of the heat exchanger unit 10 and the coupling member 70 of the blower unit 50 are secured by screws to each other is lower than the upper surfaces of the heat exchanger unit 10 and the blower unit 50. 10 [0030) As described above, the indoor unit 100 according to Embodiment 1 allows the end of the protrusion 55 of the blower unit 50 to be placed on the end of the guide 20 of the heat exchanger unit 10 (in some cases with the help of 15 the operator's power exerted in the coupling direction), thereby enabling the heat exchanger unit 10 to be positioned with regard to the blower unit 50 in the breadthwise direction and further enabling the heat exchanger unit 10 and the blower unit 50 to be temporarily secured to each 20 other at their lower portions. Then, the coupling member 70 of the blower unit 50 is fastened to the coupling surface 30 of the heat exchanger unit 10 with screws, thereby allowing the blower unit 50 and the heat exchanger unit 10 to be coupled together, It is not difficult to perform such a 25 coupling operation in the ceiling of a room. Accordingly, the indoor unit 100 according to Embodiment 1 can enhance dimensional compactness, allowing the heat exchanger unit 10 18 and the blower unit 50 to be easily coupled together even when they are installed, for example, in the ceiling (upper surface of the ceiling 6). [0031] 5 The location where the guide 20, the protrusion 55, and the coupling member 70 and the like are provided is not limited to the above-described location. For example, the protrusion 70 and the coupling member 70 may be provided as shown in Fig. 6. 10 [0032] Fig. 6 is a side view showing another example (hereinafter referred to as an indoor unit 101) of an indoor unit according to Embodiment 1 of the present invention. Fig. 6(a) shows the indoor unit 101 with the heat exchanger 15 unit 10 and the blower unit 50 not coupled together, while Fig. 6(b) shows the indoor unit 101 with the heat exchanger unit 10 and the blower unit 50 coupled together. [0033] As shown in Fig. 6, the guide 20 is provided on the 20 lower portion of the coupling side surface 52 of the blower unit 50. The gap 21 is formed between the coupling side surface 52 of the blower unit 50 and the guide 20. In conjunction with this, the protrusion 55 to be inserted into the gap 21 is provided on the coupling side surface 12 of 25 the heat exchanger unit 10. Also, the guide 60 is provided on the coupling side surface 12 of the heat exchanger unit 10. In conjunction 19 with this, an opening 57 (corresponding to the first opening according to the present invention) into which the guide 60 is inserted is provided on the coupling side surface 52 of the blower unit 50. 5 Furthermore, the coupling member 70 is provided on the upper portion of the coupling side surface 12 of the heat exchanger unit 10. The gap 71 is formed between the coupling side surface 52 of the heat exchanger unit 50 and the coupling member 70. in conjunction with this, the 10 coupling surface 30 which is disposed so as to face the coupling member 70 is formed on the coupling side surface 52 of the blower unit 50. [00341 In other words, in the indoor unit 101, the coupling 15 side surface 52 of the blower unit 50 is the first side surface of the present invention or the coupling side surface 12 of the heat exchanger unit 10. The indoor unit 101 as described above also allows the end of the protrusion 55 of the heat exchanger unit 10 to be 20 placed on the end of the guide 20 of the blower unit 50 (in some cases with the help of the operator's power exerted in the coupling direction), thereby enabling the heat exchanger unit 10 to be positioned with regard to the blower unit 50 in the breadthwise direction and further enabling the heat 25 exchanger unit 10 and the blower unit 50 to be temporarily secured to each other at their lower portions. Then, the coupling member 70 of the heat exchanger unit 10 is fastened 20 to the coupling surface 30 of the blower unit 50 with screws, thereby allowing the blower unit 50 and the heat exchanger unit 10 to be coupled together. It is not difficult to perform such a coupling operation at the 5 ceiling of a room. Accordingly, the indoor unit 101 can enhance dimensional compactness, allowing the heat exchanger unit 10 and the blower unit 50 to be easily coupled together even when they are installed, for example, in the ceiling (upper surface of the ceiling 6). 10 [0035] Either of the indoor unit 100 or the indoor unit 101 provides the effect of allowing easy installation of indoor units, while the configuration of the indoor unit 100 provides the effect of reducing assembly man-hours of indoor 15 units. [0036] Fig. 7 is a side view showing an assembling method for the indoor unit 100 according to Embodiment 1 of the present invention. Fig. 8 is a perspective view showing the indoor 20 unit 100 which is packaged after assembled. Fig. 7(a) shows the indoor unit 101 with the heat exchanger unit 10 and the blower unit 50 not coupled together, while Fig. 7(b) shows the indoor unit 101 with the heat exchanger unit 10 and the blower unit 50 coupled together. In the following 25 description, a view as seen from an arrow Z of Fig. 7(a) is treated as a front view of the indoor unit 100, [0037] 21 In an indoor unit like the indoor unit 100, which is installed in the ceiling (on the upper surface of the ceiling 6), maintenance of the installed indoor unit is carried out from the side of the ceiling 6 (from the front 5 in Fig. 7). For this, an openable maintenance opening is formed in the front sides (or, in the installed state, bottom sides facing the ceiling surface) of the enclosure 11 of the heat exchanger unit 10 and the enclosure 51 of the blower unit 50. For assembly of the indoor unit 100, access 10 to the inside of the indoor unit 100 is made through the maintenance opening. For this reason, the indoor unit 100 is assembled in such a manner that the heat exchanger unit 10 and the blower unit 50 are disposed longitudinally. Also, the indoor unit 100 is assembled in such a manner 15 that the heat exchanger unit 10 is disposed below the blower unit 50 since the heat exchanger unit 10 is heavier than the blower unit 50. [0038] As shown in Fig. 7(a), the heat exchanger unit 10 is 20 assembled on a lower packaging material 91. After that, the blower unit 50 which has been separately assembled is connected to the upper portion of the heat exchanger unit 10. When the heat exchanger unit 10 and the blower unit 10 are coupled with each other, the end of the protrusion 55 of 25 the blower unit 50 is inserted into the gap 21 of the heat exchanger unit 10, as indicated by an arrow D. Also, the guide 60 of the blower unit 50 is inserted into the opening 22 13 of the heat exchanger unit 10. At this time, since the upper surface 62 of the guide 60 is inclined to the opening 13 (coupling side surface 12) of the heat exchanger unit 10, blower unit's own weight exerted in the direction of an 5 arrow E allows the guide 60 to be inserted to the direction indicated by an arrow F. In conjunction with this, the blower unit 50 moves in the direction of an arrow G. At the same time, the guide 60 is guided along the tapered portion 63 and inserted through the opening 13 of the heat exchanger 10 unit 10, thereby allowing the blower unit 50 to be positioned with regard to the blower unit 50 in the breadthwise direction (the direction perpendicular to the side view in Fig. 7). In the heat exchanger unit 10 and the blower unit 50, this causes the coupling side surface 12 of 15 the heat exchanger unit 10 to come face to face with the coupling side surface 52 of the blower unit 50, as shown in Fig. 7(b). [0039] In the state shown in Fig. 7(b), the threaded holes 31 20 formed on the coupling surface 30 of the heat exchanger unit 10 become aligned with the through holes 72 formed on the coupling member 70 of the blower unit 50. Accordingly, screws are inserted in the direction of an arrow H through the through holes 72 into the threaded holes 31 and screwed 25 in, thereby allowing the heat exchanger unit 10 and the blower unit 50 to be coupled together. 23 Finally, an upper packaging material 92 is placed on the upper portion of the blower unit 50, and the lower packaging material 91, the indoor unit 100, and the upper packaging material 92 are bound with a PP band (not 5 illustrated), thereby completing the assembly and packaging of the indoor unit 100. [0040] As described above, the indoor unit 100 allows the heat exchanger unit 10 and the blower unit 50 to be coupled for 10 assembly using the same coupling method as in the installation of the indoor unit 100. This reduces the time required for coupling the heat exchanger unit 10 and the blower unit 50 for assembly, resulting in a reduction in assembly man-hours of the indoor unit 100. 15 [0041] Embodiment 2 The guide 60 modified to have a shape shown below will be able to provide some additional desirable effects in addition to the effects provided in Embodiment 1. Items 20 that are not referred to in Embodiment 2 are the same as those in Embodiment 1, and the same features and configurations are described using the same reference numerals and symbols. [0042] 25 Fig. 9 is a disassembled perspective view showing an indoor unit (hereinafter referred to as an indoor unit 102) according to Embodiment 2 of the present invention in an 24 assembled state. Fig. 10 is a disassembled perspective view showing a state in which an electrical component box 80 is disposed at portion P of Fig. 9. Fig. 11 is a view as seen from the arrowed line Y of Fig. 10. Fig. 11 is a see 5 through view showing components behind a base 52a of the guide 60 for ease of understanding the shape of the guide 60. In the following description, a view as seen from an arrow X of Fig. 7(a) is treated as a front view of the indoor unit 102. 10 (0043) As shown in Fig. 9, in the indoor unit 102 according to Embodiment 2, an enclosure 51 of the blower unit 50 is formed as a separate component. In other words, the coupling side surface 52 of the enclosure 51 is replaced by 15 the base 52a which is a separate member. For this, the protrusion 55, the guide 60, and the coupling member 70 are provided on the base 52a. 10044) Also, in the indoor unit 102 according to Embodiment 2, 20 the guide 60 is provided on the base 52a as shown below. The upper surface 62 of the guide 60 has a tongue 64 formed at an end thereof, the tongue 64 having a somewhat smaller width than the end. In other words, a step 65 is formed at a boundary between the upper surface 62 and the 25 tongue 64. The base 52a has an opening 52b formed therein, into which the tongue 64 of the guide 60 is inserted. The opening 52b is configured to have a somewhat larger width 25 than the tongue 64. The guide 60 is mounted on the base 52a in such a manner that the tongue 64 is inserted into the opening 52b until the step 65 comes into contact with the base 52a. This causes the guide 60 to be positioned, After 5 that, a welding portion formed on an end of a lower surface 61 of the guide 60 is spot-welded to the base 52a, thereby allowing the guide 60 to be secured to the base 52a. The opening 52b corresponds to the second opening of the present invention. 10 [00451 Mounting the guide 60 on the base 52a (or the coupling side surface 52 if the enclosure 51 and the coupling side surface 52 are formed in an integral manner) in such a manner results in enhanced mounting accuracy of the guide 60 15 as compared with mounting the guide 60 on the base 52a (or the coupling side surface 52 if the enclosure 51 and the coupling side surface 52 are formed in an integral manner) only by welding. [0046] 20 As shown in Fig. 10, the tongue 64 of the guide 60 is folded along the base 52a so as to produce a predetermined gap between the tongue 64 and the base 52a. Also, the folded tongue 64 has a folded portion 66 formed at a substantially intermediate portion thereof, the folded 25 portion 66 being further folded toward the base 52a. 26 Furthermore, as shown in Fig. 10, an opening 81 into which the tongue 64 is inserted is formed in a surface facing the base 52a of the electrical component box 80. Inserting the tongue 64 into the opening 81 causes the 5 electrical component box 80 (more specifically a surface of the electrical component box 80, in which the opening 81 is formed) to be held between the base 52a and the tongue 64 and be temporarily secured. The opening 81 corresponds to the third opening of the 10 present invention. [0047] The electrical component box 80 is heavy and poor in weight balance. Temporarily securing the electrical component box 80 as described in Embodiment 2 allows the 15 electrical component box 80 to be stabilized and easily screwed (on a permanent basis). This provides the effect of reducing the assembly man-hours of the indoor unit 102. [00481 In Embodiment 1, the tongue 64 of the guide 60 is 20 folded before the tongue 64 is inserted into the opening 81 of the electrical component box 80. Needless to say, after the tongue 64 is inserted into the opening 81 of the electrical component box 80, the tongue 64 may be folded in order to temporarily secure the electrical component box 80 25 to the base 52a. [0049] Embodiment 3 27 When the indoor unit shown in Embodiments 1 or 2 is installed in the ceiling (upper surface of the ceiling), the blower unit 50 is once dismantled from the heat exchanger unit 10. This operation reverses the coupling steps for 5 indoor unit assembly. For this, as understood with reference to Fig. 7, if the sealing member 40 is provided on the opposite coupling side surface (for example, the coupling side surface 12) of the coupling side surface (for example, the coupling side surface 52) where the protrusion 10 55 is provided, there is concern that the end of the protrusion 55 hooks into and peels off the sealing member 40 when the blower unit 50 is removed from the heat exchanger unit 10. However, the indoor unit configured to have the following arrangement provides the effect of preventing the 15 sealing member 40 from being peeled off, in addition to the effect provided by Embodiments 1 and 2. In the following description, an indoor unit according to Embodiment 3 is described using an indoor unit in which the coupling side surface 12 of the heat exchanger unit 10 corresponds to the 20 first side surface of the present invention (namely, the coupling side surface 52 of the heat exchanger unit 50 corresponds to the second side surface of the present invention). Items that are not referred to in Embodiment 3 are the same as those in Embodiment 1 or 2, and the same 25 features and configurations are described using the same reference numerals and symbols. [0050] 28 Fig. 12 a side view showing an example (hereinafter referred to as an indoor unit 103) of an indoor unit according to Embodiment 3 of the present invention. Fig. 12 shows the indoor unit 103 with the heat exchanger unit 10 5 and the blower unit 50 not coupled together. [0051] As shown in Fig. 12, the indoor unit 103 has the sealing member 40 provided on the coupling side surface 52 of the blower unit 50. In other words, the sealing member 10 40 is provided on the coupling side surface (second coupling side surface) in the side where the protrusion 55 is provided. Due to the sealing member 40 provided as described above, the sealing member 40 and the protrusion 55 stay 15 together when the blower unit 50 is removed from the heat exchanger unit 10. Accordingly, the end of the protrusion 55 is prevented from hooking into and peeling off the sealing member 40 when the blower unit 50 is removed from the heat exchanger unit 10. 20 [0052] Fig. 13 is a perspective view showing another example (hereinafter referred to as an indoor unit 104) of an indoor unit according to Embodiment 3 of the present invention. Fig. 14 is an explanatory diagram showing a disassembling 25 method for the indoor unit 104. Fig. 14(a) shows the indoor unit 104 with the heat exchanger unit 10 and the blower unit 50 not coupled together, while Fig. 14 (b) shows the indoor 29 unit 104 with the heat exchanger unit 10 and the blower unit 50 coupled together. In the following description, a view as seen from an arrow W of Figs. 13 and 14 is treated as a front view of the indoor unit 104. 5 (0053) As shown in Fig. 13, the indoor unit 104 has a guide 68 in addition to the guide 60 provided on the coupling side surface 52 of the blower unit 50. The guide 68 has the same shape as the guide 60. In other words, the guide 68 has a 10 rear surface (upper surface in the installed state) which is slanted forward (downward in the installed state) toward an end. The guide 60 and the guide 68 are disposed in such a manner that their distances from the front side of the indoor unit 104 (or distances from the bottom surface in the 15 installed state) are different from each other. [0054) In the coupling side surface 12 of the heat exchanger unit 10, an opening 16 is formed at a position which is aligned with the guide 68. The rear end (or upper end in 20 the installed state) of the opening 16 is located by a predetermined dimension to the rear (or upward in the installed state) of the rear end (or upper end in the installed state) of the guide 68. The rear end (or upper end in the installed state) of the opening 13 into which the 25 guide 60 is inserted is also located by a predetermined dimension to the rear (or upward in the installed state) of 30 the rear end (or upper end in the installed state) of the guide 60. Although Fig. 13 shows the vicinity of only one side of the indoor unit 104, the indoor unit 104 also has the guide 5 68 and the opening 16 formed in the vicinity of the other sides not illustrated. [0055] As shown in Fig. 15, when the blower unit 50 is removed from the heat exchanger unit 10, the blower unit 50 is moved 10 to the rear. This causes the rear surface (or upper surface in the installed state) of the guide 68 to come into contact with the rear end (or upper end in the installed state) of the opening 16. Similarly, the upper surface 62 of the guide 60 comes into contact with the rear end (or upper end 15 in the installed state) of the opening 13. When the blower unit 50 is further moved to the rear, the blower unit 50 moves in the direction of arrow I. At this time, the rear surface (or upper surface in the installed state) of the guide 68 has substantially the same inclination angle as the 20 upper surface 62 of the guide 60, which causes the blower unit 50 to move in the direction of arrow I while the coupling side surface 12 of the heat exchanger unit 10 remains substantially parallel to the coupling side surface 52 of the blower unit 50. The indoor unit 104 configured to 25 have the arrangement described above also prevents the end of the protrusion 55 from hooking into and peeling off the 31 sealing member 40 when the blower unit 50 is removed from the heat exchanger unit 10. (Reference Signs List] [0056] 5 2: indoor unit heat exchanger 3: drain pan 4: blower 5: motor 6: ceiling 10 10: heat exchanger unit 11: enclosure 12: coupling side surface 13: opening 14: outlet opening 15 16: opening 20: guide 21: gap 30: coupling surface 31: threaded hole 20 40: sealing member 50: blower unit 51: enclosure 52: coupling side surface 52a: base 25 52b: opening 53: opening 54: inlet opening 32 55: protrusion 56; handle 57: opening 60 (60a, 60b): guide 5 61: lower surface 62: upper surface 63: tapered portion 64: tongue 65: step 10 66: folded portion 67: welding portion 68; guide 70: coupling member 71: gap 15 72: through hole 80: electrical component box 81: opening 91: lower packaging material 92: upper packaging material 20 100-104: indoor unit 110: heat exchanger unit 111: flange 120: blower unit 121: flange 25 122: top panel 123: bottom panel 33