Indoor heat exchanger

Abstract

To provide laminated plates that allow a space in an air conditioner to be effectively used.SOLUTION: Plate laminated bodies (50 and 60) of an indoor heat exchanger comprise first plate parts (50A and 60A) arranged adjacently to a heat exchange part (B) in a first direction, and comprising one or more plates (52 and 62), and second plate parts (50B and 60B) comprising one or more of the plates (52 and 62), and arranged on surfaces on the side opposite to surfaces of the first plate parts (50A and 60A) opposed to the heat exchange part (B). Step parts (X) are formed in peripheral edge parts of first surfaces (501 and 601) opposed to the heat exchange part (B) out of the plate laminated bodies (50 and 60), and the step parts (X) are formed by the first plate parts (50A and 60A) and the second plate parts (50B and 60B).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an indoor heat exchanger. [Background technology]

[0002] Patent Document 1 discloses a stacked header connected to a heat exchanger. A groove is formed in each plate constituting the stacked header. By stacking a plurality of plates having such grooves, the grooves form a refrigerant flow path inside the stacked header. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 184917 Summary of the Invention [Problem to be solved by the invention]

[0004] All plates constituting the plate stack are formed to have the same shape. The shape and position of the grooves formed in the plates vary depending on the structure of the refrigerant flow path. Therefore, the area of ​​the region where no grooves are formed varies depending on the plate. Since the region where no grooves are formed has no use, if the region is relatively large, the space inside the air conditioner cannot be used effectively.

[0005] An object of the present disclosure is to provide a laminate plate that can effectively utilize the space inside an air conditioner. [Means for solving the problem]

[0006] The first aspect is a heat exchange section (B) including a plurality of fins (41) and a plurality of heat transfer tubes (42) penetrating the plurality of fins (41); a plate stack (50, 60) having a plurality of plates (52, 62) stacked in a first direction in which the heat transfer tube (42) extends, the plate stack (50, 60) having a flow path (51, 61) therein and communicating with the heat transfer tube (42), The plate stack (50, 60) is The heat exchange unit (B) is disposed adjacent to the heat exchange unit (B) in the first direction, a first plate portion (50A, 60A) having one or more of the plates (52, 62); a second plate portion (50B, 60B) disposed on a surface of the first plate portion (50A, 60A) opposite to a surface facing the heat exchange portion (B), A step portion (X) is formed on the periphery of a first surface (501, 601) of the plate stack (50, 60) facing the heat exchange section (B), The step portion (X) is an indoor heat exchanger formed by the first plate portion (50A, 60A) and the second plate portion (50B, 60B).

[0007] In the first aspect, by providing a step portion (X) in the plate stack (50, 60), a space can be formed at a position opposite the step portion (X). This space can be effectively utilized by, for example, arranging a predetermined component in the space.

[0008] The second aspect is the first aspect, The plate stack (50, 60) is composed of three or more of the plates (52, 62), Of the plate stack (50, 60), the plate (52, 62) of the first plate portion (50A, 60A) closest to the heat exchange section (B) is a first end plate (521); the plate (52, 62) of the second plate portion (50B, 60B) farthest from the heat exchange portion (B) is a second end plate (525); When the plate (52, 62) disposed between the first end plate (521) and the second end plate (525) is an intermediate plate (522-524), The flow path (51, 61) is formed to pass through the intermediate plate (522-524, 622-624), The thickness of the intermediate plates (522 to 524) is greater than the thickness of the first end plate (521) and the second end plate (525).

[0009] In the second aspect, the plate (52, 62) arranged in the center of the plate stack (50, 60) is made thicker than the plates (52, 62) arranged at both ends of the plate stack (50, 60), thereby making it possible to increase the cross-sectional area or inner diameter of the refrigerant flow paths (51, 61) formed in the plate stack (50, 60), thereby making it possible to suppress an increase in pressure loss of the refrigerant flowing through the refrigerant flow paths (51, 61).

[0010] The third aspect is the first or second aspect, At least a part of a first surface (501, 601) of the plate stack (50, 60) and a second surface (502, 602) opposite to the first surface (501, 601) is subjected to anticorrosion treatment.

[0011] In the third aspect, although there is a risk of electrolytic corrosion on both side surfaces of the plate stack (50, 60) due to condensation or the like, such electrolytic corrosion can be suppressed by the anticorrosion treatment.

[0012] A fourth aspect is any one of the first to third aspects, When looking at the plate stack (50, 60) from the side opposite to the first direction, the area of ​​the portion of the second plate portion (50B, 60B) that does not overlap with the first plate portion (50A, 60A) is smaller than the area of ​​the portion where the first plate portions (50A, 60A) overlap.

[0013] The portion of the plate stack (50, 60) where the first plate portion (50A, 60A) and the second plate portion (50B, 60B) overlap is thicker than the portion consisting of only the first plate portion (50A, 60A), and therefore a larger number of flow paths (51, 61) can be formed. This increases the number of refrigerant flow paths in the heat transfer tubes (42) of the heat exchange section (B), thereby facilitating heat exchange. In the fourth aspect, the portion of the plate stack (50, 60) where the first plate portion (50A, 60A) and the second plate portion (50B, 60B) overlap is wider than the portion consisting of only the first plate portion (50A, 60A), thereby ensuring a sufficient number of flow paths in the plate stack (50, 60), and thus facilitating heat exchange between the air and the refrigerant in the indoor heat exchanger.

[0014] A fifth aspect is any one of the first to fourth aspects, The flow paths (51, 61) are a first flow path (51A) provided in the first plate portion (50A, 60A); a second flow path (51B) provided across the first plate portion (50A, 60A) and the second plate portion (50B, 60B), The second flow path (51B) is formed so as to intersect with the first flow path (51A).

[0015] In the fifth aspect, in the plate stack (50, 60) in the portion where the flow paths (51, 61) do not intersect, the flow paths (51, 61) need only be provided in the first plate portion (50A, 60A). In such a portion, the second plate portion (50B, 60B) is not required, so that the step portion (X) can be provided. In this way, the space formed by the step portion (X) can be effectively utilized.

[0016] A sixth aspect is any one of the first to fifth aspects, the heat exchange section (B) is provided with a U-shaped connecting pipe (400) that is disposed between the heat exchange section (B) and the plate stack (50, 60) and connects the two heat transfer tubes (42) to each other; The connection pipe (400) is provided at a position facing the step portion (X) when viewed from the opposite side to the first direction.

[0017] While the gap between the heat exchange section (B) and the plate stack (50, 60) needs to be large enough to accommodate the U-shaped connecting pipe (400), in the sixth aspect, the connecting pipe (400) is provided in the space formed by the step portion (X), so that the gap between the heat exchange section (B) and the plate stack (50, 60) can be made relatively small, thereby enabling the indoor heat exchanger to be made compact.

[0018] The seventh aspect is the sixth aspect, a detection unit (70) that detects the temperature of the refrigerant flowing through the heat transfer tube (42), The detection portion (70) is provided on the connecting pipe (400).

[0019] In the seventh aspect, the space formed by the step portion (X) can be effectively utilized to provide the detection portion (70).

[0020] The eighth aspect is the sixth or seventh aspect, The connecting pipe (400) has When the indoor heat exchanger functions as an evaporator, the refrigerant in the superheated region flows, When the indoor heat exchanger functions as a radiator, the refrigerant in the subcooled region flows through it.

[0021] The temperature of the refrigerant in the superheated region is relatively high, and the temperature of the refrigerant in the supercooled region is relatively low. Therefore, if there is another flow path near the flow path through which the refrigerant in the superheated region or the supercooled region passes, the refrigerant passing through that flow path will exchange heat with the refrigerant passing through the refrigerant in the superheated region or the supercooled region. In contrast, in the eighth aspect, by passing the refrigerant in the superheated region or the supercooled region through the connecting pipe (400), it is possible to suppress heat exchange with the refrigerant flowing through the flow path in the plate stack (50, 60).

[0022] A ninth aspect is an indoor heat exchanger according to any one of the first to eighth aspects; a gas pipe (12a) for conveying compressed refrigerant gas to the indoor heat exchanger (40); The gas pipe (12a) is an indoor heat exchanger connected to the flow path (51, 61) formed in a portion of the plate stack (50, 60) where the first plate portion (50A, 60A) and the second plate portion (50B, 60B) overlap.

[0023] In the ninth aspect, among the flow paths (51, 61) extending in the stacking direction of the plates (52, 62), the flow paths (51, 61) extending in the stacking direction between the first plate portion (50A, 60A) and the second plate portion (50B, 60B) are relatively long. Therefore, by flowing compressed gas refrigerant through such flow paths (51, 61), pressure loss of the gas refrigerant passing through the flow paths (51, 61) can be suppressed. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a piping diagram of an air conditioner according to an embodiment. [Diagram 2] FIG. 2 is a front view of the air conditioning indoor unit. [Diagram 3] FIG. 3 is a cross-sectional view of the air conditioning indoor unit taken along line II-II. [Figure 4] FIG. 4 is a front view showing the internal structure of the air conditioning indoor unit. [Diagram 5] FIG. 5 is an enlarged perspective view showing a main part of the indoor heat exchanger. [Figure 6] FIG. 6 shows the plate stack as seen from the left side. [Figure 7] FIG. 7 is a cross-sectional view illustrating a coolant flow path of a plate stack. [Figure 8] FIG. 8 is a schematic diagram of the front plate assembly as viewed from the front. [Figure 9] FIG. 9 is a cross-sectional view of the front plate assembly for explaining the configuration of the first flow path. [Figure 10] FIG. 10 is a cross-sectional view of the front plate assembly for explaining the configuration of the second flow path. [Figure 11] FIG. 11 is a schematic diagram showing the first flow passages and the second flow passages intersecting each other when the plate stack is viewed from the first direction (right direction). [Figure 12] Fig. 12(a) is a perspective view and a plan view showing a state in which the temperature sensor is attached to the U-shaped connecting pipe, and Fig. 12(b) is a plan view showing a state in which the temperature sensor is attached to the U-shaped connecting pipe. [Figure 13] FIG. 13 is a schematic diagram of an indoor heat exchanger according to the first modification, which corresponds to FIG. [Figure 14] FIG. 14 is a schematic diagram of a main part of an indoor heat exchanger according to the second modification, viewed from above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0026] (1) Overall configuration of air conditioning system This embodiment is an air conditioner including a heat exchanger unit (10). The air conditioner (10) adjusts the temperature of air in an indoor space (I), which is a target space.

[0027] As shown in Fig. 1, the air conditioner (10) is an example of a refrigeration cycle device including a refrigerant circuit (11). The refrigerant circuit (11) is filled with a refrigerant. The refrigerant circuit (11) performs a refrigeration cycle by circulating the refrigerant.

[0028] The air conditioner (10) includes an air conditioning outdoor unit (20), an air conditioning indoor unit (30), a first connecting pipe (12), and a second connecting pipe (13). The air conditioner (10) is a pair type having one air conditioning outdoor unit (20) and one air conditioning indoor unit (30). The first connecting pipe (12) is a gas connecting pipe, and the second connecting pipe (13) is a liquid connecting pipe.

[0029] The air conditioner outdoor unit (20) is installed outdoors and includes an outdoor casing (20a), and a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), a four-way switching valve (24), and an outdoor fan (25) housed in the outdoor casing (20a).

[0030] The compressor (21) is a rotary compressor such as a swing piston type, rotary type, or scroll type. The outdoor heat exchanger (22) exchanges heat between the refrigerant and outdoor air. The outdoor heat exchanger (22) is a fin-and-tube type. The outdoor expansion valve (23) reduces the pressure of the refrigerant. The outdoor expansion valve (23) is an electronic expansion valve. The four-way switching valve (24) switches between a first state (a state shown by a solid line in FIG. 1) and a second state (a state shown by a dashed line in FIG. 1). In the first state, the four-way switching valve (24) communicates between the discharge portion of the compressor (21) and the gas end of the outdoor heat exchanger (22) and also communicates between the suction portion of the compressor (21) and the first connection pipe (12). The four-way switching valve (24) in the second state communicates the discharge portion of the compressor (21) with the first connection pipe (12) and also communicates the suction portion of the compressor (21) with the gas end of the outdoor heat exchanger (22). The outdoor fan (25) transports the air flowing through the outdoor heat exchanger (22). The outdoor fan (25) is a propeller fan.

[0031] The air conditioner indoor unit (30) includes a casing (31), and an indoor heat exchanger (40), an indoor fan (32), and an indoor expansion valve (37) housed in the casing (31).

[0032] (2) Air conditioning indoor unit The air conditioning indoor unit (30), which is an indoor air conditioner, will be described in detail with reference to Figs. 2 to 4. The air conditioning indoor unit (30) of this embodiment is a wall-mounted type provided on a wall of the indoor space (I). Note that the terms "upper," "lower," "right," "left," "front," and "rear" described below correspond to the directions of the arrows shown in Figs. 2 and 3, and the left-right directions are based on the case where the casing (31) is viewed from the front.

[0033] (2-1) Casing 2 and 3, the casing (31) is formed in a horizontally long box shape and has a front plate (31a), a rear plate (31b), an upper plate (31c), a lower plate (31d), a first side plate (31e), and a second side plate (31f).

[0034] The front plate (31a) is formed on the front side of the casing (31) and constitutes the front surface of the casing (31). The rear plate (31b) is formed on the rear side of the casing (31) and constitutes the rear surface of the casing (31). The upper plate (31c) is formed on the upper side of the casing (31) and constitutes the upper surface of the casing (31). The lower plate (31d) is formed on the lower side of the casing (31) and constitutes the lower surface of the casing (31). The first side plate (31e) is formed on the right side of the casing (31) and constitutes the right surface of the casing (31). The second side plate (31f) is formed on the left side of the casing (31) and constitutes the left surface of the casing (31).

[0035] An intake port (33) is formed in the upper plate (31c), and an exhaust port (34) is formed in the lower plate (31d). An air passage (P) is formed inside the casing (31) from the intake port (33) to the exhaust port (34). The intake port (33) extends in the longitudinal direction of the casing (31). The intake port (33) is an opening for taking air from the indoor space (I) into the air passage (P). An exhaust port (34) is formed in the lower plate (31d). The exhaust port (34) extends in the longitudinal direction of the casing (31). The exhaust port (34) is an opening for blowing air from the air passage (P) into the indoor space (I).

[0036] (2-2) Filter The air conditioning indoor unit (30) includes a filter (35). The filter (35) is disposed on the rear side of the suction port (33) and upstream of the indoor heat exchanger (40). The filter (35) collects dust in the air sent from the suction port (33) to the indoor heat exchanger (40). The air conditioning indoor unit (30) may include a dust removal mechanism that removes the dust collected by the filter (35).

[0037] (2-3) Heat exchanger unit The heat exchanger unit (U) includes one indoor heat exchanger (40) and one indoor expansion valve (37). The indoor heat exchanger (40) includes one heat exchanger body (B) and two plate stacks (50, 60). The heat exchanger body (B) of the indoor heat exchanger (40) is disposed so as to cross the air passage (P). The air passage (P) is divided into an upstream side and a downstream side of the heat exchanger body (B).

[0038] (2-4) Indoor fan The indoor fan (32) is disposed in the air passage (P). The indoor fan (32) is disposed in the air passage (P) downstream of the indoor heat exchanger (40). The indoor fan (32) is a crossflow fan. The indoor fan (32) has a fan rotor that extends in the longitudinal direction of the casing (31).

[0039] (2-5) Flap The air conditioning indoor unit (30) has a flap (36) that adjusts the direction of air blown out of the air outlet (34). The flap (36) adjusts the air direction in the vertical direction. The air conditioning indoor unit (30) may have a plurality of flaps (36). The flap (36) may adjust the air direction in the horizontal direction.

[0040] (3) Heat exchanger unit As described above, the heat exchanger unit (U) includes the indoor heat exchanger (40), the indoor expansion valve (37), the gas relay pipe (12a), and the liquid relay pipe (13a).

[0041] (3-1) Indoor heat exchanger The indoor heat exchanger (40) shown in Figures 3 to 5 includes a heat exchanger body (B) and a plate stack (50, 60) connected to the heat exchanger body (B). The indoor heat exchanger (40) is a fin-and-tube heat exchanger having fins (41) and heat transfer tubes (42). The indoor heat exchanger (40) exchanges heat between air and a refrigerant.

[0042] The heat exchanger body (B) is an example of a heat exchange section (B). The heat exchanger body (B) includes a plurality of fins (41) and a plurality of heat transfer tubes (42) penetrating the plurality of fins (41). The plurality of fins (41) are arranged in the longitudinal direction of the casing (31). The plurality of heat transfer tubes (42) extend in the arrangement direction of the fins (41). The plate stack (50, 60) is provided therein with a refrigerant flow path (51, 61) that communicates with the heat transfer tubes (42). The refrigerant flow path (51, 61) is an example of a flow path (51, 61).

[0043] The fins (41) are rectangular plates having long sides and short sides. The thickness direction of the fins (41) corresponds to the arrangement direction of the fins (41). The multiple fins (41) are arranged at predetermined intervals in the thickness direction. This interval defines an air flow path. The material of the fins (41) is an aluminum alloy.

[0044] The heat transfer tube (42) is a straight tube. The material of the heat transfer tubes (42) is an aluminum alloy. A refrigerant flow path is formed inside the heat transfer tube (42). The heat transfer tubes (42) extend parallel to one another and penetrate the fins (41). A right end portion, which is one end portion of the heat transfer tube (42), protrudes to the right of the rightmost fin (41) among the fins (41). The end portion of the heat transfer tube protruding to the right is connected to the plate stack (50, 60).

[0045] Of the left ends of the heat transfer tubes 42, the ends of two adjacent heat transfer tubes 42 are connected to each other by a U-shaped tube 48. The two adjacent heat transfer tubes 42 and the U-shaped tube 48 connecting them are formed integrally without any seams.

[0046] The indoor heat exchanger (40) of this embodiment has a front heat exchange section (40A) and a rear heat exchange section (40B). The front heat exchange section (40A) is located toward the front side of the casing (31), and the rear heat exchange section (40B) is located toward the rear side of the casing (31). The front heat exchange section (40A) and the rear heat exchange section (40B) are arranged in a direction perpendicular to both the up-down direction and the axial direction of the heat transfer tube (42), i.e., in the front-rear direction, with the indoor fan (32) between them.

[0047] The front heat exchange section (40A) includes a front main heat exchange section (43), a first auxiliary heat exchange section (44), and a second auxiliary heat exchange section (45).

[0048] The front main heat exchange section (43) is disposed in the front heat exchange section (40A) closer to the indoor fan (32). The front main heat exchange section (43) has an outer shape formed in a V-shape when viewed in the longitudinal direction of the heat transfer tube (42). The tip of the V-shape faces forward.

[0049] The front main heat exchange section (43) is composed of a first front main heat exchange section (43a) and a second front main heat exchange section (43b). The first front main heat exchange section (43a) is located at an upper part of the front main heat exchange section (43), and the second front main heat exchange section (43b) is located at a lower part of the front main heat exchange section (43). The lower end of the first front main heat exchange section (43a), i.e., the lower short side of the fin (41), contacts the long side of the fin (41) of the second front main heat exchange section (43b) (strictly speaking, the upper end portion of the long side of the fin (41)).

[0050] The first auxiliary heat exchange section (44) is provided on the inlet side (front side) of the first front main heat exchange section (43a). The number of heat transfer tubes (42) in the first auxiliary heat exchange section (44) in a direction along the long sides (hereinafter referred to as the number of stages) is smaller than the number of stages of the heat transfer tubes (42) in the first front main heat exchange section (43a). The number of heat transfer tubes (42) in the first auxiliary heat exchange section (44) in a direction along the short sides (hereinafter referred to as the number of rows) is smaller than the number of rows of the heat transfer tubes (42) in the first front main heat exchange section (43a).

[0051] The second auxiliary heat exchange section (45) is provided on the inlet side (front side) of the second front main heat exchange section (43b). The number of stages and rows of the heat transfer tubes (42) of the second auxiliary heat exchange section (45) is smaller than the number of stages and rows of the heat transfer tubes (42) of the second front main heat exchange section (43b).

[0052] The rear heat exchange section (40B) has a rear main heat exchange section (46) and a third auxiliary heat exchange section (47). The rear main heat exchange section (46) is disposed closer to the indoor fan (32) in the rear heat exchange section (40B). The third auxiliary heat exchange section (47) is provided on the inlet side (rear side) of the rear main heat exchange section (46). The lengths of the long and short sides of the fins (41) of the third auxiliary heat exchange section (47) are shorter than the lengths of the long and short sides of the fins (41) of the rear main heat exchange section (46). The number of stages and rows of the heat transfer tubes (42) of the third auxiliary heat exchange section (47) is smaller than the number of stages and rows of the heat transfer tubes (42) of the rear main heat exchange section (46).

[0053] The plate stack (50, 60) is disposed to the right of the heat exchanger body (B) and adjacent to the heat exchanger body (B). The right side is an example of a first direction. Specifically, the plate stack (50, 60) is disposed to the right of the rightmost fin (41) of the multiple fins (41) and parallel to the fin (41). The plate stack (50, 60) is connected to an end of the heat transfer tube (42). As shown in FIG. 5, the plate stack (50, 60) includes a front plate stack (50) connected to the heat transfer tube (42) of the front heat exchange section (40A) and a rear plate stack (60) connected to the heat transfer tube (42) of the rear heat exchange section (40B). The front plate stack (50) is disposed to overlap the front heat exchange section (40A) in the axial direction of the heat transfer tube (42). The rear plate stack (60) is disposed so as to overlap the rear heat exchange section (40B) in the axial direction of the heat transfer tubes (42). The front plate stack (50) and the rear plate stack (60) will be described in detail later.

[0054] (3-2) Indoor expansion valve, gas relay pipe, liquid relay pipe The indoor expansion valve (37) is an electronic expansion valve with a variable opening degree. The indoor expansion valve (37) is disposed on the right side of the plate stack (50, 60). The indoor expansion valve (37) is connected to the front plate stack (50) via a first internal pipe (38) and is connected to the rear plate stack (60) via a second internal pipe (39). The first internal pipe (38) and the second internal pipe (39) are an example of refrigerant pipes connecting a front refrigerant flow path (51) of the front plate stack (50) and a rear refrigerant flow path (61) of the rear plate stack (60).

[0055] (4) Plate stack The gas relay pipe (12a) transports the refrigerant gas compressed by the compressor (21) to the indoor heat exchanger (40). The gas relay pipe (12a) is an example of a gas pipe (12a). One end of the gas relay pipe (12a) is connected to the rear plate stack (60). The other end of the gas relay pipe (12a) is connected to the first connection pipe (12) via a joint. One end of the liquid relay pipe (13a) is connected to the front plate stack (50). The other end of the liquid relay pipe (13a) is connected to the second connection pipe (13) via a joint.

[0056] The plate stack (50, 60) has therein a flow path (51, 61) which communicates with the heat transfer tube (42). The plate stack (50, 60) is configured such that a plurality of plates (52, 62) are stacked in the rightward direction. Hereinafter, the plate stack (50, 60) of this embodiment will be described in detail with reference to FIGS. 5 to 14.

[0057] (4-1) Front plate assembly The front plate stack (50) includes a front refrigerant flow path (51), a front connecting pipe (53), a front relay section (54), and a liquid end section (55). The front refrigerant flow path (51) is formed in the front plate stack (50). The front connecting pipe (53) connects the heat transfer tubes (42) of the front heat exchange section (40A) to the front refrigerant flow path (51). The front relay section (54) is connected to the first internal piping (38). The liquid end section (55) communicates with the second connection piping (13) via the liquid relay pipe (13a). In the following, the front plate stack (50) will be described as the plate stack (50, 60) of the present disclosure.

[0058] (4-1-1) First plate section and second plate section As shown in Figs. 5, 6 and 8, the front plate stack (50) has a front first plate portion (50A) and a front second plate portion (50B). The front first plate portion (50A) is an example of the first plate portion (50A, 60A) of the present disclosure. The front second plate portion (50B) is an example of the second plate portion (50B, 60B) of the present disclosure. The front first plate portion (50A) has two stacked front plates (52). The front second plate portion (50B) has three stacked front plates (52).

[0059] The outer edges of the front plates (52) of the front first plate portion (50A) have the same shape. The three front plates (52) of the front first plate portion (50A) include, from the left, a first plate (521) and a second plate (522). A front connecting pipe (53) extending toward the right end of the heat transfer tube (42) is connected to the first plate (521). The inside of the front connecting pipe (53) defines a front refrigerant flow path (51), which will be described later.

[0060] The outer edges of the front plates (52) of the front second plate portion (50B) have the same shape. The three front plates (52) of the front second plate portion (50B) are referred to as a third plate (523), a fourth plate (524), and a fifth plate (525) from the left.

[0061] The shape of each of the front plates (521, 522) of the front first plate portion (50A) is different from the shape of each of the front plates (523, 524, 525) of the front second plate portion (50B). Specifically, the shape of the outer edge of the front first plate portion (50A) is different from the shape of the outer edge of the front second plate portion (50B).

[0062] The front second plate portion (50B) is disposed on a surface of the front first plate portion (50A) opposite to the surface facing the heat exchanger body (B). Specifically, the front second plate portion (50B) is disposed on a right side surface of the front first plate portion (50A).

[0063] The front plates (521-525) are made of the same material as the heat transfer tube (42) and the front connecting tube (53). In this embodiment, the front plates (521-525) of the front first plate portion (50A) and the front second plate portion (50B) are made of an aluminum alloy.

[0064] When the front plate stack (50) is viewed from the left, the area of ​​the left side surface of the front first plate portion (50A) is smaller than the area of ​​the left side surface of the front second plate portion (50B). In other words, when viewed from the left of the front plate stack (50), a first region (S1) is formed in which the front first plate portion (50A) and the front second plate portion (50B) do not overlap, and a second region (S2) is formed in which the front first plate portion (50A) and the front second plate portion (50B) overlap.

[0065] When viewing the front plate assembly (50) from the opposite side from the right, i.e., from the left, the area of ​​the portion of the front second plate portion (50B) that is not overlapped with the front first plate portion (50A) is smaller than the area of ​​the portion that is overlapped with the front first plate portion (50A). In other words, the area of ​​the first region (S1) is smaller than the area of ​​the second region (S2).

[0066] As shown in FIG. 8, the front plate stack (50) has a step (X). The step (X) is formed by the front first plate portion (50A) and the front second plate portion (50B). The step (X) is formed in the peripheral portion of the left side surface (501) of the front plate stack (50) facing the heat exchanger body (B). The left side surface (501) of the front plate stack (50) is an example of the first surface (501). In other words, the step (X) is formed in the peripheral portion of the left side surface of the front plate stack (50). In further words, the step (X) is a portion where the first region (S1) is formed when the front plate stack (50) is viewed from the left direction. Specifically, the step (X) is formed by the first region (S1) and the first peripheral surface (P1) of the front second plate portion (50B). The first circumferential surface (P1) refers to a portion of the circumferential surface sandwiched between the right side surface and the left side surface of the front first plate portion (50A), which is in contact with the first region (S1).

[0067] The step portion (X) is formed in the lower portion of the front plate stack (50) when the front plate stack (50) is viewed from the right. Specifically, the step portion (X) is formed in the front plate stack (50) below the height position of the center of the front plate stack (50). In other words, in the air conditioning indoor unit (30) of this embodiment, the air inlet (33), the front heat exchange section (40A), and the air outlet (34) are arranged in this order from the top (see FIG. 3), and therefore the step portion (X) is formed in the front plate stack (50, 60) at a position close to the air outlet (34).

[0068] In this manner, the first region (S1) is formed below the front second plate portion (50B). The overlapping portions of the front first plate portion (50A) and the front second plate portion (50B) of the peripheral surface of the front plate stack (50) are flush with each other. In other words, when the front plate stack (50) is viewed from the left, there is no region where the front first plate portion (50A) and the front second plate portion (50B) do not overlap.

[0069] Furthermore, the first region (S1) only needs to be formed below the front first plate portion (50A) when the front plate assembly (50) is viewed from the left, and the shape of the first region (S1) is not limited.

[0070] The front plate assembly (50) is anticorrosive. Specifically, the front plate assembly (50, 60) is anticorrosive on the entire left side surface (501) and the second region (S2) of the right side surface (502). In the present embodiment, an alloy plate having a sacrificial anticorrosion effect is provided on the entire left side surface (501) and the second region (S2) of the right side surface (502) of the front plate assembly (50, 60). The alloy plate is made of, for example, a clad material having an aluminum core material and a metal with a relatively high zinc content as a skin material. The first region (S1) and the first peripheral surface (P1) do not require anticorrosion. This is because the third plate (523) constituting the first region (S1) is a thick intermediate plate (522-524). Similarly, the fourth plate (524) constituting a part of the first circumferential surface (P1) is also a thick intermediate plate (522-524).

[0071] Next, the plate thickness of each of the front plates (521-525) of the front plate stack (50) will be described. In the front plate stack (50), the front plate (52) of the front first plate portion (50A) closest to the heat exchanger body (B) is defined as the first end plate, and the front plate (52) of the front second plate portion (50B) farthest from the heat exchanger body (B) is defined as the second end plate. In this embodiment, the first end plate (521) is the first plate (521) located at the left end of the front first plate portion (50A), and the second end plate (525) is the fifth plate (525) located at the right end of the front second plate portion (50B).

[0072] In the front plate stack (50), the plates disposed between the first end plate (521) and the second end plate (525) are referred to as intermediate plates (522-524). In this embodiment, the intermediate plates (522-524) are the second plate (522), the third plate (523), and the fourth plate (524).

[0073] The thickness of each of the intermediate plates (522-524) is greater than the thickness of the first end plate (521) and the second end plate (525). In this embodiment, the thickness of each of the intermediate plates (522-524) is 3.0 mm, and the thickness of the first end plate (521) and the second end plate (525) is 1.5 mm.

[0074] (4-1-2) Coolant flow path configuration The configuration of the front refrigerant flow path (51) of the plate stack (50, 60) of this embodiment will be described. The front refrigerant flow path (51) is included in the refrigerant flow paths (51, 61) of the present disclosure. An example of the front refrigerant flow path (51) will be described below.

[0075] 9 and 10, the front refrigerant flow path (51) has a first flow path (51A) provided in the front first plate portion (50A) and a second flow path (51B) provided across the front first plate portion (50A) and the front second plate portion (50B). The first flow path (51A) and the second flow path (51B) are provided in a portion overlapping with the front first plate portion (50A) and the front second plate portion (50B).

[0076] The first flow path (51A) is composed of two first through holes (71) penetrating in the thickness direction of the first plate (521) located at the left end of the front first plate portion (50A), a first groove portion (81) formed in the second plate (522) located in the center, and a third plate (523) located at the right end. One end of the first through hole (71) communicates with one end of the heat transfer tube (42). The other end of the first through hole (71) is connected to the first groove portion (81).

[0077] The first groove portion (81) is an elongated hole formed along the surface of the first plate (521). One end of the first groove portion (81) is connected to one of the first through holes (71), and the other end of the first groove portion (81) is connected to the other first through hole (71). The first groove portion (81) is blocked from the left and right directions by the first plate (521) located at the left end and the first plate (521) located at the right end.

[0078] The second flow path (51B) is composed of a second through hole (72) penetrating the front first plate portion (50A) in the thickness direction, a second groove portion (82) formed in a fourth plate (524) located at the left end of the front second plate portion (50B), and a fifth plate (525) located at the right end of the front second plate portion (50B). One end of the second through hole (72) communicates with one end of the heat transfer tube (42). The other end of the second through hole (72) is connected to the second groove portion (82). The second groove portion (82) is an elongated hole formed along the surface of the second plate (522). One end of the second groove portion (82) is connected to one of the second through holes (72), and the other end of the second groove portion (82) is connected to the other of the second through holes (72). The second groove (82) is closed from the left and right directions by a third plate (523) and a fifth plate (525).

[0079] In Fig. 11, the first groove (81) is indicated by a dashed line, and the second groove (82) is indicated by a dashed two-dot line. As shown in Fig. 11, the first groove (81) and the second groove (82) are disposed so as to intersect with each other when the front plate assembly (50) is viewed from the left. That is, the second flow path (51B) intersects with the first flow path (51A). Specifically, the second flow path (51B) is formed so as to straddle the first flow path (51A) to the right.

[0080] (4-2) Rear plate assembly 5 and 6, the rear plate laminate (60) includes a rear refrigerant flow path (61) formed inside the rear plate laminate (60), a plurality of rear connection pipes (not shown) connecting the plurality of heat transfer tubes (42) of the rear heat exchange section (40B) and the rear refrigerant flow path (61), a rear relay section (64) to which the second internal piping (39) is connected, and a gas end portion (65) communicating with the first connection piping (12) via the gas relay pipe (12a). The rear refrigerant flow path (61) is included in the refrigerant flow paths (51, 61) of the present disclosure.

[0081] The rear plate stack (60) differs from the front plate stack (50) in the shape of the outer edges of the plates when viewed from the right and in the rear refrigerant flow passages (61) therein. The rear plate stack (60) is a thick plate-like member formed by stacking five rear plates (62) of the same shape. The rear plates (62) are stacked to the right.

[0082] The five rear plates (62) that make up the rear plate stack (60) are, arranged from left to right, a sixth plate (621), a seventh plate (622), an eighth plate (623), a ninth plate (624), and a tenth plate (625) (see FIG. 5).

[0083] Similar to the front plate stack (50, 60), the sixth plate (621) closest to the heat exchange section (B) is the first end plate (621), the tenth plate (625) farthest from the heat exchange section (B) is the second end plate (625), and the seventh to ninth plates (622-624) disposed between the sixth plate (621) and the tenth plate (625) are the middle plates (622-624). In this case, the plate thickness of each of the middle plates (622-624) is greater than the plate thicknesses of the sixth plate (621) and the tenth plate (625).

[0084] The rear plate assembly (50, 60) is subjected to the same anticorrosive treatment as the front plate assembly (50, 60). Specifically, the alloy plate is attached to the left side surface (601) and the right side surface (602) of the rear plate assembly (60). The left side surface (601) and the right side surface (602) of the rear plate assembly (60) correspond to the first surface (601) and the second surface (602) of the present disclosure, respectively.

[0085] The rear relay part (64) is a circular pipe. As shown in Fig. 5, the rear relay part (64) is disposed on the right side surface of the rear plate stack (60). That is, in the rear plate stack (60), the second internal pipe (39) connecting the front refrigerant flow path (51) of the front plate stack (50) and the rear refrigerant flow path (61) of the rear plate stack (60) is connected to the right side surface of the rear plate stack (60). The gas end part (65) is a circular pipe. The gas end part (65) is disposed on the right side surface of the rear plate stack (60).

[0086] (4-3) U-shaped connecting pipe 8, in the indoor heat exchanger (40), a U-shaped connecting pipe (400) is disposed between the heat exchanger body (B) and the front plate stack (50). Hereinafter, the U-shaped connecting pipe (400) is referred to as a U-shaped connecting pipe (400).

[0087] The U-shaped connecting pipe (400) is provided in the heat exchanger body (B). The U-shaped connecting pipe (400) connects adjacent heat transfer tubes (42). The refrigerant flowing from the heat transfer tube (42) of the heat exchanger body (B) into the U-shaped connecting pipe (400) does not pass through the plate stacks (50, 60) but flows into the adjacent heat transfer tube (42) and then flows through the heat exchanger body (B).

[0088] The U-shaped connecting pipe (400) is provided at a position opposite to the right direction, that is, facing the step portion (X) when viewed from the left direction. Specifically, the right end of the U-shaped pipe is located inside the space formed by the step portion (X). More specifically, the right end of the U-shaped connecting pipe (400) is located to the right of the left side surface of the front plate assembly (50). In other words, in the left-right direction, the right end of the U-shaped connecting pipe (400) is located at the same position as the left side surface of the first plate (521) or to the right of that position.

[0089] The air conditioner indoor unit (30) includes a temperature sensor (70) that detects the temperature of the refrigerant. The temperature sensor (70) detects the temperature of the refrigerant flowing through the heat transfer tube (42). The temperature sensor (70) is an example of a detection unit (70).

[0090] As shown in FIGS. 12(a) and 12(b), the temperature sensor (70) is provided on the U-shaped connecting pipe (400), and the indoor heat exchanger (40) includes an attachment portion (90). The attachment portion (90) is a member for attaching the temperature sensor (70) to the U-shaped connecting pipe. The attachment portion (90) includes an attachment member (91) that houses the temperature sensor (70) and a brazing portion (92) that attaches the attachment member (91) to the surface of the U-shaped connecting pipe (400). The attachment member (91) is attached to the U-shaped connecting pipe (400) via the brazing portion (92).

[0091] The mounting member (91) has, for example, a substantially cylindrical shape and is configured to be able to accommodate a part of the temperature sensor (70) therein. The mounting member (91) is attached, for example, to a curved portion of the U-shaped connecting pipe (400). The brazed portion (92) is configured to extend linearly, for example. The brazed portion (92) is formed, for example, by supplying brazing material between the U-shaped connecting pipe (400) and the mounting member (91) and heating it with the flame of a burner.

[0092] A sacrificial layer having a lower electric potential than the surface of the mounting member (91) is provided on a portion of the surface of the mounting member (91). The sacrificial layer is made of Zn, a Zn alloy, an Al alloy containing Zn, or the like, and is formed on the surface of the heat transfer tube (42) by, for example, thermal spraying. The sacrificial layer sacrificially protects the mounting member (91) from corrosion, thereby suppressing corrosion of the surface of the mounting member (91) for a long period of time.

[0093] The mounting member 91 and the piping such as the U-shaped connecting pipe 400 are made of the same type of metal such as aluminum A3003, etc. This can prevent electrolytic corrosion of the mounting member 91 and the piping.

[0094] (5) Features (5-1) Feature 1 The front plate stack (50) of the plate stack (50, 60) of the indoor heat exchanger (40) of this embodiment is disposed adjacent to the indoor heat exchanger body (B) in the right direction (first direction). The front plate stack (50) has a front first plate portion (50A) having two front plates (52), and a front second plate portion (50B) having three front plates (52) different in shape from the front plates (52) of the front first plate portion (50A) and disposed on the surface of the front first plate portion (50A) opposite to the surface facing the heat exchanger body (B). A step portion (X) is formed on the peripheral portion of the surface of the front plate stack (50) facing the heat exchanger body (B), and the step portion (X) is formed by the front first plate portion (50A) and the front second plate portion (50B).

[0095] In this manner, by providing the step portion (X) in the front plate laminate (50), a space can be formed at a position opposite the step portion (X). By utilizing this space, for example, by disposing predetermined components in the space, the air conditioning indoor unit (30) can be made more compact.

[0096] (5-2) Feature 2 In this embodiment, the second to fourth plates (522-524) of the front plate stack (50) are thicker than the first plate (521) and the fifth plate (525), and the seventh to ninth plates (622-624) of the rear plate stack (60) are thicker than the sixth plate (621) and the tenth plate (625).

[0097] In this way, by increasing the thickness of the intermediate plates (522-524), it is possible to increase the cross-sectional area or inner diameter of the refrigerant flow paths (51, 61) formed in the plate stack (50, 60), thereby making it possible to suppress an increase in pressure loss of the refrigerant flowing through the refrigerant flow paths (51, 61).

[0098] (5-3) Feature 3 In this embodiment, the plate stack (50, 60) has a surface opposite to the surface facing the heat exchanger body (B) that is treated to be anticorrosive, thereby making it possible to prevent electrolytic corrosion of the right side surface of the plate stack (50, 60) due to condensation or the like, and to improve the durability of the indoor heat exchanger (40).

[0099] (5-4) Feature 4 When looking at the front plate assembly (50) from the left, the area of ​​the portion of the front second plate portion (50B) that is not overlapped by the front first plate portion (50A) is smaller than the area of ​​the portion that is overlapped by the front first plate portion (50A).

[0100] The portion of the front plate stack (50) where the front first plate portion (50A) and the front second plate portion (50B) overlap is thicker than the portion consisting of only the front first plate portion (50A), and therefore a larger number of flow paths (51, 61) can be formed. This increases the amount of refrigerant flowing through the heat transfer tubes (42) of the heat exchange section (B), thereby facilitating heat exchange. In this embodiment, by making the area of ​​the portion where the front first plate portion (50A) and the front second plate portion (50B) overlap larger than the area of ​​the portion consisting of only the front first plate portion (50A), a sufficient number of flow paths can be secured in the front plate stack (50), and heat exchange between the air and the refrigerant in the indoor heat exchanger (40) can be promoted.

[0101] (5-5) Feature 5 The front refrigerant flow path (51) includes a first flow path (51A) provided in the front first plate portion (50A) and a second flow path (51B) provided between the front first plate portion (50A) and the front second plate portion (50B). The second flow path (51B) is formed so as to intersect with the first flow path (51A).

[0102] By designing the front refrigerant flow path (51) so that the first flow path (51A) and the second flow path (51B) intersect, the variety of flow path patterns of the front refrigerant flow path (51) in the front plate stack (50) can be increased. Meanwhile, in the front plate stack (50), only the first flow path (51A) is provided, and a portion where the first flow path (51A) and the second flow path (51B) do not intersect is made a step portion (X), thereby forming a space that can be effectively utilized. In other words, by providing such a step portion (X), it is possible to reduce an unnecessary region of one front plate (52) where the front refrigerant flow path (51) is not provided.

[0103] (5-6) Feature 6 The heat exchanger body (B) of this embodiment is provided with a U-shaped connecting pipe (400) that is disposed between the heat exchanger body (B) and the front plate stack (50) and connects the two heat transfer tubes (42). The U-shaped connecting pipe (400) is provided at a position facing the step portion (X) when viewed from the left direction (the direction opposite to the first direction).

[0104] Although the gap between the heat exchanger body (B) and the front plate assembly (50) needs to be large enough to accommodate the U-shaped connecting pipe (400), in this embodiment, the connecting pipe (400) is arranged in the space formed by the step portion (X), so that the gap between the heat exchanger body (B) and the front plate assembly (50) can be made relatively small, thereby enabling the indoor heat exchanger (40) to be made compact.

[0105] (5-7) Feature 7 In the present embodiment, a temperature sensor (70) for detecting the temperature of the refrigerant flowing through the heat transfer tube (42) is further provided, and the temperature sensor (70) is provided in the U-shaped connecting tube (400). The space formed by the step portion (X) can be effectively utilized to provide the detection portion (70).

[0106] (6) Variations A modified air conditioner indoor unit (30) will be described below, focusing on configurations different from the air conditioner indoor unit (30) of the above embodiment.

[0107] (6-1) Variation 1 As shown in FIG. 13, in the indoor heat exchanger (40) of the first modification, the U-shaped connecting pipe (400) is connected to the front plate stack (50). Specifically, the U-shaped connecting pipe (400) is disposed in the first region (S1) of the front plate stack (50). Both ends of the U-shaped connecting pipe (400) extend rightward and connect to the refrigerant flow paths (51, 61) formed in the front second plate portion (50B). In this manner, the refrigerant flowing through the refrigerant flow paths (51, 61) in the front plate stack (50) flows through the U-shaped connecting pipe (400) of the first modification. By providing a temperature sensor (70) in the U-shaped connecting pipe (400), the temperature of the refrigerant flowing through the front plate stack (50) can be detected.

[0108] (6-2) Variation 2 The rear plate stack (60) of the second modified example has the same configuration as the front plate stack (50) of the above embodiment. That is, the rear plate stack (60) has a rear first plate portion (60A) and a rear second plate portion (60B). The rear first plate portion (60A) and the rear second plate portion (60B) are examples of the first plate portions (50A, 60A) and second plate portions (50B, 60B) of the present disclosure.

[0109] The rear plate stack (60) is an example of the plate stack (50, 60) of the present disclosure. The configurations of the rear first plate portion (60A) and the rear second plate portion (60B) are the same as the configurations of the front first plate portion (50A) and the front second plate portion (50B) of the front plate stack (50) of the above embodiment, respectively, and therefore description thereof will be omitted. The rear plate stack (60) is formed with a first region (S1) in which the rear second plate portion (60B) and the rear first plate portion (60A) do not overlap, and a second region (S2) in which the rear second plate portion (60B) and the rear first plate portion (60A) overlap, as viewed from the left direction.

[0110] In the indoor heat exchanger (40) of the second modification, the first internal pipe (38) and the second internal pipe (39) are disposed between the heat exchanger body (B) and the plate stack (50, 60). Specifically, the first internal pipe (38) is connected to the left side surface of the front plate stack (50). The second internal pipe (39) is connected to the left side surface of the rear plate stack (60). The front relay portion (54) of this modification is disposed in the first region (S1) of the front plate stack (50), and the rear relay portion (64) is disposed in the first region (S1) of the rear plate stack (60). The first internal pipe (38) extends from the rear relay portion (64) to the left (heat exchanger body (B)) and then extends to the rear plate stack (60). The second internal pipe (39) extends from the rear relay portion (64) to the left (heat exchanger body (B)), and then extends to the front plate stack (50). In this manner, in this modified example, even if the space between the heat exchanger body (B) and the plate stack (50, 60) is relatively narrow, the first internal pipe (38) and the second internal pipe (39) can be disposed by utilizing the space formed by the step portion (X).

[0111] (7) Other embodiments The air conditioning indoor unit (30) of the above embodiment and the above modified example may have the following configuration.

[0112] In the above embodiment, when the indoor heat exchanger (40) functions as a radiator, the indoor heat exchanger (40) may be configured so that the refrigerant in the supercooling region flows through the U-shaped connecting pipe (400). Since the U-shaped connecting pipe (400) is disposed away from the front plate stack (50), heat exchange between the refrigerant in the supercooling region and the refrigerant flowing through the front plate stack (50) can be suppressed.

[0113] When the rear plate assembly (60) has a rear first plate portion (60A) and a rear second plate portion as in the above-described second modification, the U-shaped connecting pipe (400) may be disposed at a position facing the step portion (X) of the rear plate assembly (60). In this case, the U-shaped connecting pipe (400) may be connected to the rear heat exchanger body (B) or to the rear plate assembly (60). When the indoor heat exchanger (40) functions as an evaporator, the indoor heat exchanger (40) may be configured so that a refrigerant in a superheated region flows through the indoor heat exchanger (40). For example, the U-shaped connecting pipe (400) communicates with the first connection pipe (12) via the gas end portion (65). In this way, the refrigerant in the overheated region flows through the U-shaped connecting pipe (400) located outside the plate stack (50, 60), thereby preventing the refrigerant flowing through the refrigerant flow paths (51, 61) in the plate stack (50, 60) from exchanging heat with the refrigerant in the overheated region.

[0114] When the rear plate stack (60) has the rear first plate portion (60A) and the rear second plate portion (60B) as in the above-described second modification, the gas end portion (65) may be connected to a rear refrigerant flow path (61) formed in a portion where the rear first plate portion (60A) and the rear second plate portion (60B) overlap. Specifically, the gas end portion (65) may be disposed in the second region (S2). In this manner, the refrigerant that has flowed into the rear plate stack (60) from the first connection pipe (12) via the gas relay pipe (12a) passes through the relatively long refrigerant flow path (51, 61) that extends in the stacking direction between the rear first plate portion (60A) and the rear second plate portion (60B), thereby suppressing pressure loss of the compressed gas refrigerant.

[0115] The indoor heat exchanger (40) is disposed in an air passage (P) that communicates with an air inlet (33) and an air outlet (34) provided in the casing (31), and the step portion (X) may be formed on the downstream side of the air flow in the plate stack (50, 60) when viewed from the right.

[0116] For example, in summer, when the indoor heat exchanger (40) functions as an evaporator, a temperature gradient is formed in the air passage (P) such that the temperature decreases from the inlet (33) to the outlet (34). Since the air temperature is higher upstream in such an air passage (P), the heat exchange load is greater in the upstream portion of the indoor heat exchanger (40) than in the downstream portion of the air flow. Therefore, by providing the step portion (X) in the downstream portion of the plate stack (50, 60) and thickening the upstream portion of the plate stack (50, 60), a sufficient number of refrigerant flow paths (51, 61) can be ensured in the upstream portion of the plate stack (50, 60). This increases the flow rate of the refrigerant flowing to the upper portion of the heat exchanger body (B), and promotes heat exchange between the refrigerant and the air in the upper portion of the indoor heat exchanger (40). As a result, the heat exchange load at the upper part of the indoor heat exchanger (40) can be reduced, and the efficiency of heat exchange with the air flowing through the air passage (P) can be increased, so that the air temperature in the indoor space can be brought to the target temperature more quickly.

[0117] In the above modification, the rear plate stack (60) may be formed with rear refrigerant flow paths (61) corresponding to the first flow paths (51A) and the second flow paths (51B) of the front plate stack (50) of the above embodiment. In other words, the rear plate stack (50, 60) may be configured such that a plurality of rear refrigerant flow paths (61) intersect with one another.

[0118] In the above embodiment and modified examples, instead of using an alloy plate having a sacrificial anticorrosive effect, a corrosion-resistant or rust-resistant paint may be applied to the plate stack (50, 60). In this case, the paint is an epoxy resin-based paint. The paint may be applied so that a coating is formed on the front surface including the right side surface (502) and the left side surface (501) of the plate stack (50, 60).

[0119] In the above embodiment and modified examples, the heat transfer tube (42), the plate stack (50, 60), the refrigerant piping (the connecting tube (53) and the U-shaped connecting tube (400)), the mounting member (91), and the detection portion of the temperature sensor (70) may be made of a copper alloy or stainless steel. Moreover, the heat transfer tube (42), the U-shaped connecting tube (400), the mounting member (91), and the temperature sensor (70) are preferably made of the same type of metal. In addition, when the heat transfer tube (42) is made of a copper alloy, the plate stack (50, 60) and the refrigerant piping are also preferably made of a copper alloy.

[0120] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be appropriately combined or substituted as long as the functions of the subject of this disclosure are not impaired. The descriptions "first", "second", ... described above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0121] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for indoor heat exchangers and air conditioner indoor units. [Explanation of symbols]

[0122] 12a Gas relay pipe (gas pipe) 30 Air conditioning indoor unit 40 Indoor heat exchanger 41 Finn 42 Heat transfer tube 50,60 Plate stack 50A, 60A First plate section 50B, 60B Second plate section 51, 61 Coolant flow path (flow path) 51A First flow path 51B Second flow path 52,62 Plate 70 Temperature sensor (detection part) 400 U-shaped connecting pipe (connecting pipe) 521 First Plate (First End Plate) 522~524 Intermediate plate 525 Second End Plate (5th Plate) B Heat exchanger body (heat exchange part) X Step

Claims

1. a heat exchange section (B) including a plurality of fins (41) and a plurality of heat transfer tubes (42) penetrating the plurality of fins (41); a plate stack (50, 60) having a flow path (51, 61) provided therein and communicating with the heat transfer tube (42), and having a plurality of plates (52, 62) stacked in a first direction in which the heat transfer tube (42) extends, The plate stack (50, 60) is The heat exchange unit (B) is disposed adjacent to the heat exchange unit (B) in the first direction, a first plate portion (50A, 60A) having one or more of the plates (52, 62); a second plate portion (50B, 60B) disposed on a surface of the first plate portion (50A, 60A) opposite to a surface facing the heat exchange portion (B), a step portion (X) is formed on a peripheral edge of a first surface (501, 601) of the plate stack (50, 60) facing the heat exchange section (B), The step portion (X) is formed by the first plate portion (50A, 60A) and the second plate portion (50B, 60B). Indoor heat exchanger.

2. The plate stack (50, 60) is composed of three or more of the plates (52, 62), Of the plate stack (50, 60), the plate (52, 62) of the first plate portion (50A, 60A) closest to the heat exchange section (B) is a first end plate (521); the plate (52, 62) of the second plate portion (50B, 60B) farthest from the heat exchange portion (B) is a second end plate (525); When the plate (52, 62) disposed between the first end plate (521) and the second end plate (525) is an intermediate plate (522-524), the flow path (51, 61) is formed to pass through the intermediate plate (522-524, 622-624); The thickness of the intermediate plates (522-524) is greater than the thickness of the first end plate (521) and the second end plate (525). The indoor heat exchanger according to claim 1 .

3. At least a part of a first surface (501, 601) and a second surface (502, 602) opposite to the first surface (501, 601) of the plate stack (50, 60) is subjected to anticorrosion treatment. The indoor heat exchanger according to claim 1 or 2.

4. When the plate stack (50, 60) is viewed from the side opposite to the first direction, an area of ​​a portion of the second plate portion (50B, 60B) that is not overlapped with the first plate portion (50A, 60A) is smaller than an area of ​​a portion of the second plate portion (50B, 60B) that is overlapped with the first plate portion (50A, 60A). The indoor heat exchanger according to claim 1 or 2.

5. The flow paths (51, 61) a first flow path (51A) provided in the first plate portion (50A, 60A); a second flow path (51B) provided across the first plate portion (50A, 60A) and the second plate portion (50B, 60B), The second flow path (51B) is formed so as to intersect with the first flow path (51A). The indoor heat exchanger according to claim 1 or 2.

6. the heat exchange section (B) is provided with a U-shaped connecting pipe (400) that is disposed between the heat exchange section (B) and the plate stack (50, 60) and connects the two heat transfer tubes (42) to each other; The connecting pipe (400) is provided at a position facing the step portion (X) when viewed from the first direction. The indoor heat exchanger according to claim 1 or 2.

7. a detection unit (70) that detects the temperature of the refrigerant flowing through the heat transfer tube (42), The detection unit (70) is provided in the connecting pipe (400). The indoor heat exchanger according to claim 6.

8. The connecting pipe (400) has When the indoor heat exchanger functions as an evaporator, the refrigerant in the superheated region flows, When the indoor heat exchanger functions as a radiator, the refrigerant in the subcooled region flows The indoor heat exchanger according to claim 6.

9. The indoor heat exchanger according to claim 1 or 2; a gas pipe (12a) through which compressed refrigerant gas is transported to the indoor heat exchanger (40); The gas pipe (12a) is connected to the flow path (51, 61) formed in a portion where the first plate portion (50A, 60A) and the second plate portion (50B, 60B) of the plate stack (50, 60) overlap each other. Air conditioning indoor unit.

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