Indoor heat exchanger, refrigeration cycle device, and air-conditioning indoor unit

Abstract

To provide an indoor heat exchanger capable of accurately detecting the temperature of a refrigerant.SOLUTION: The indoor heat exchanger is provided with: heat exchange units (40A, 40B) having fins (41) and heat transfer tubes (42); plate structures (50, 60) to which the heat transfer tubes (42) are connected and in which refrigerant passages (51, 61) are formed; and a piping part that communicates with the heat transfer tubes (42) or the refrigerant passages (51, 61). A temperature sensor (70) for detecting the temperature of a refrigerant is provided in the piping part.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an indoor heat exchanger, a refrigeration cycle device, and an air conditioning indoor unit. [Background technology]

[0002] Patent Document 1 discloses a heat exchanger. The heat exchanger described in Patent Document 1 has a heat exchanger body and a refrigerant distributor. The heat exchanger body has a refrigerant flow path. The refrigerant distributor distributes and supplies refrigerant to a plurality of predetermined flow path portions in the heat exchanger body. The refrigerant distributor is provided with a plate-shaped distribution member and is composed of plate-shaped members overlapping each other, including the plate-shaped distribution member. The plate-shaped distribution member is made of a center plate. The center plate has a refrigerant branching flow path portion. The refrigerant branching flow path portion has a refrigerant throttling function for supplying refrigerant at a predetermined flow rate to a plurality of predetermined flow path portions in the heat exchanger body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-125652 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the indoor unit of an air conditioner, a thermistor for detecting refrigerant temperature is sometimes provided in the indoor unit to measure the temperature of the heat exchanger or to detect the temperature of the refrigerant and control various components of the air conditioner (such as the compressor rotation speed) based on the detected refrigerant temperature.

[0005] The refrigerant distributor (plate structure) described in Patent Document 1 is provided, for example, to reduce the installation space required for refrigerant piping in the indoor unit, thereby making the indoor unit more compact. However, this also limits the location where the thermistor can be installed, and depending on the installation location, the accuracy of the thermistor in detecting the refrigerant temperature may decrease.

[0006] An object of the present disclosure is to make it possible to detect the temperature of a refrigerant with high accuracy. [Means for solving the problem]

[0007] The first aspect is directed to an indoor heat exchanger. The indoor heat exchanger includes a heat exchange section (40A, 40B) having fins (41) and a heat transfer tube (42), a plate structure (50, 60) to which the heat transfer tube (42) is connected and in which a refrigerant passage (51, 61) is formed, and a piping section communicating with the heat transfer tube (42) or the refrigerant passage (51, 61), and a temperature sensor (70) for detecting the temperature of the refrigerant is provided in the piping section.

[0008] In the first aspect, the temperature of the refrigerant can be detected with high accuracy.

[0009] In a second aspect, in the first aspect, the temperature sensor (70) is attached to the piping portion via a mounting member (91).

[0010] In the second embodiment, the temperature sensor (70) is provided on the mounting member (91), whereby the temperature sensor (70) can be attached to the piping.

[0011] In a third aspect, in the first or second aspect, the mounting member (91) and the portion of the piping where the temperature sensor (70) is attached are made of the same type of metal.

[0012] In the third aspect, electrolytic corrosion of the mounting member (91) and the piping can be suppressed.

[0013] A fourth aspect is any one of the first to third aspects, wherein the heat exchange section (40A, 40B) includes a tube plate facing the plate structure (50, 60), and the distance between the tube plate and the plate structure (50, 60) is 35 mm or less.

[0014] In the fourth aspect, the heat exchanger can be formed compactly.

[0015] In a fifth aspect, in any one of the first to fourth aspects, the piping section includes a first piping section (81) that is not in communication with the refrigerant passages (51, 61) but is in communication with two of the heat transfer tubes (42), and the temperature sensor (70) is provided in the first piping section (81).

[0016] In the fifth aspect, the temperature of the refrigerant flowing through the first piping section (81) can be detected.

[0017] A sixth aspect is any one of the first to fourth aspects, wherein the piping section includes a second piping section (82) that is provided outside the plate structure (50, 60) and has both ends communicating with the refrigerant passage (51, 61), and the temperature sensor (70) is provided in the second piping section (82).

[0018] In the sixth aspect, the temperature of the refrigerant flowing through the second piping section (82) can be detected.

[0019] A seventh aspect is any one of the first to fourth aspects, wherein the piping section includes a third piping section (83) provided between the heat exchange section (40A, 40B) and the plate structure (50, 60), and the temperature sensor (70) is provided in the third piping section (83).

[0020] In the seventh aspect, the temperature of the refrigerant flowing through the third piping section (83) can be detected.

[0021] An eighth aspect is any one of the first to fourth aspects, wherein the heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the plate structure (50, 60) includes a first plate structure (50) to which a heat transfer tube (42) of the first heat exchange section (40A) is connected, and a second plate structure (60) to which a heat transfer tube (42) of the second heat exchange section (40B) is connected, the piping section includes a fourth piping section (84) communicating with a refrigerant passage (51, 61) formed in the first plate structure (50) and a refrigerant passage (51, 61) formed in the second plate structure (60), and the temperature sensor (70) is provided in the fourth piping section (84).

[0022] In the eighth aspect, the temperature of the refrigerant flowing through the fourth piping section (84) can be detected.

[0023] A ninth aspect is any one of the first to fourth aspects, wherein the heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the plate structure (50, 60) includes a first plate structure (50) to which a heat transfer tube (42) of the first heat exchange section (40A) is connected, and a second plate structure (60) to which a heat transfer tube (42) of the second heat exchange section (40B) is connected, the piping section includes a fifth piping section (85) communicating with a refrigerant passage (51, 61) formed in the first plate structure (50) and the heat transfer tube (42) of the second heat exchange section (40B), and the temperature sensor (70) is provided in the fifth piping section (85).

[0024] In the ninth aspect, the temperature of the refrigerant flowing through the fifth piping section (85) can be detected.

[0025] A tenth aspect is any one of the first to fourth aspects, wherein the heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the piping section includes a sixth piping section (86) communicating with a heat transfer tube (42) of the first heat exchange section (40A) and a heat transfer tube (42) of the second heat exchange section (40B), and the temperature sensor (70) is provided in the sixth piping section (86).

[0026] In the tenth aspect, the temperature of the refrigerant flowing through the sixth piping portion (86) can be detected.

[0027] In an eleventh aspect, in any one of the first to tenth aspects, the refrigerant passage (111) of the plate structure (110) includes a branching portion (111a) that branches the refrigerant to be flowed into the heat exchange portion (100) and a junction portion (111b) that joins the refrigerant flowing out from the heat exchange portion (100), and the piping portion is connected between the branching portion (111a) and the junction portion (111b).

[0028] In the eleventh aspect, the temperature of the refrigerant can be effectively detected.

[0029] A twelfth aspect is the eleventh aspect, wherein the heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), The refrigerant divided by the flow dividing portion (51a) flows into the first heat exchange portion (40A), and the refrigerant flowing out from the second heat exchange portion (40B) is joined by the flow junction (61b).

[0030] In the twelfth aspect, the temperature of the refrigerant can be effectively detected.

[0031] A thirteenth aspect is any one of the first to twelfth aspects, wherein a refrigerant in a gas-liquid two-phase state flows through the piping portion.

[0032] In the thirteenth aspect, the temperature of the refrigerant in a gas-liquid two-phase state can be detected.

[0033] A fourteenth aspect is directed to a refrigeration cycle apparatus. The refrigeration cycle apparatus includes a refrigerant circuit (11) to which the indoor heat exchanger according to any one of the first to thirteenth aspects is connected.

[0034] A fifteenth aspect is directed to an air conditioning indoor unit. The air conditioning indoor unit includes the indoor heat exchanger according to any one of the first to thirteenth aspects, and a casing (31) that houses the indoor heat exchanger. [Brief description of the drawings]

[0035] [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. [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 part of the indoor heat exchanger. [Figure 6] FIG. 6 is a view of the plate structure seen from the left side. [Figure 7] FIG. 7 is a cross-sectional view illustrating a coolant passage of the plate structure. [Figure 8] FIG. 8 is a partial perspective view of the front plate structure. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 10 is a view of the rear plate structure as seen from the right side. [Figure 11] 11(a) and 11(b) are schematic diagrams showing the configuration of the indoor heat exchanger. [Figure 12] Fig. 12(a) is a schematic diagram showing a first pipe portion provided with a temperature sensor, Fig. 12(b) is a perspective view showing the first sensor attachment portion, and Fig. 12(c) is a plan view showing the first sensor attachment portion. [Figure 13]FIG. 13 is a schematic diagram showing the second pipe portion provided with a temperature sensor. [Figure 14] FIG. 14 is a schematic diagram showing the configuration of a third tube portion provided with a temperature sensor. [Figure 15] Figure 15(a) is a side view showing the second sensor attachment portion, and Figure 15(b) is a cross-sectional view showing the second sensor attachment portion. [Figure 16] FIG. 16 is a schematic diagram showing the fourth tube section provided with a temperature sensor. [Figure 17] FIG. 17 is a schematic diagram showing the configuration of a fifth tube section provided with a temperature sensor. [Figure 18] FIG. 18 is a schematic diagram showing the sixth tube section in which a temperature sensor is provided. [Figure 19] FIG. 19 is a partial perspective view of a modified example of the front plate structure. [Figure 20] 20(a) and 20(b) are schematic diagrams showing the configuration of modified examples of the indoor heat exchanger. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] 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.

[0037] (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.

[0038] 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.

[0039] The air conditioner (10) includes an outdoor unit (20), an indoor unit (30), a first connecting pipe (12), and a second connecting pipe (13). The air conditioner (10) is a pair type having one outdoor unit (20) and one indoor unit (30). The first connecting pipe (12) is a gas connecting pipe, and the second connecting pipe (13) is a liquid connecting pipe.

[0040] The 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).

[0041] 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.

[0042] The 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).

[0043] (2) Air conditioning indoor unit The indoor unit (30), which is an indoor air conditioner, will be described in detail with reference to Figs. 2 to 4. The 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 direction is based on the case where the indoor casing (31) is viewed from the front.

[0044] (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).

[0045] 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).

[0046] 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).

[0047] (2-2) Filter The 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 indoor unit (30) may include a dust removal mechanism that removes the dust collected by the filter (35).

[0048] (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 structures (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).

[0049] (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).

[0050] (2-5) Flap The 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 indoor unit (30) may have a plurality of flaps (36). The flap (36) may adjust the air direction in the horizontal direction.

[0051] (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).

[0052] (3-1) Indoor heat exchanger The indoor heat exchanger (40) shown in Figures 3 to 5 includes a heat exchanger body (B) and plate structures (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.

[0053] The heat exchanger body (B) has a plurality of fins (41) arranged in the longitudinal direction of the casing (31) and a plurality of heat transfer tubes (42) extending in the arrangement direction of the fins (41). The plate structures (50, 60) have therein refrigerant passages (51, 61) that communicate with the heat transfer tubes (42).

[0054] The arrangement direction of the fins (41) corresponds to the longitudinal direction (here, the left-right direction) of the casing (31). The fins (41) are rectangular plate-shaped 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 forms an air passage. The material of the fins (41) is an aluminum alloy.

[0055] The heat transfer tubes (42) are straight tubes. The material of the heat transfer tubes (42) is an aluminum alloy. A refrigerant passage is formed inside the heat transfer tubes (42). The heat transfer tubes (42) extend parallel to one another so as to penetrate the fins (41). One end of the heat transfer tube (42), which is a right end, protrudes to the right of the fin (41). One end of the heat transfer tube is connected to the plate structures (50, 60). Of the other ends of the heat transfer tubes (42), which are left ends, the left 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 and seamlessly.

[0056] The indoor heat exchanger (40) of this embodiment includes a heat exchange section. The heat exchange section has a front heat exchange section (40A) which is a first heat exchange section, and a rear heat exchange section (40B) which is a second heat exchange section. 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.

[0057] The front heat exchange section (40A) includes a front main heat exchange section (43), a first auxiliary heat exchange section (44), a second auxiliary heat exchange section (45), and a tube plate (49).

[0058] The tube plate (49) is disposed so that the plate surface is aligned in the up-down direction and the front-rear direction, and is located on the right side of the fins (41). The tube plate (49) faces the front plate structure (50). The heat transfer tubes (42) penetrate the tube plate (49). There is almost no gap between the tube plate (49) and each heat transfer tube (42), and the tube plate (49) supports the fins (41) and the heat transfer tubes (42). The U-shaped tubes (48), the first connecting pipes (12), and the front plate structure (50) are disposed on the right side of the tube plate (49), i.e., on the opposite side of the fins (41) with respect to the tube plate (49). The distance (E) between the tube plate (49) and the front plate structure (50) is 35 mm or less. This allows the indoor heat exchanger (40) to be formed compactly.

[0059] 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.

[0060] The first auxiliary heat exchange section (44) is provided on the inflow side (front side) of the first front main heat exchange section (43a). The second auxiliary heat exchange section (45) is provided on the inflow side (front side) of the second front main heat exchange section (43b). The rear heat exchange section (40B) has a rear main heat exchange section (46), a third auxiliary heat exchange section (47), and a tube plate. 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 inflow side (rear side) of the rear main heat exchange section (46). The tube plate of the rear heat exchange section (40B) faces the rear plate structure (60). The distance between the tube plate of the rear heat exchange section (40B) and the rear plate structure (60) is 35 mm or less.

[0061] As shown in Fig. 9, one end of the heat transfer tube (42) has a flare portion (42a) that is flared. The flare portion (42a) has an expanded diameter portion (42b) that expands in diameter toward the right, and a cylindrical portion (42c) that extends rightward with a constant diameter from the right end of the expanded diameter portion (42b). As will be described in detail later, the flare portion (42a) is a portion that is connected to a connecting pipe (53, 63) of the plate structure (50, 60).

[0062] The plate structure (50, 60) is disposed on the right side of the rightmost fin (41) in parallel to the fin (41). The plate structure (50, 60) is connected to one end of the heat transfer tube (42). As shown in FIG. 5, the plate structure (50, 60) includes a front plate structure (50) connected to the heat transfer tube (42) of the front heat exchange section (40A) and a rear plate structure (60) connected to the heat transfer tube (42) of the rear heat exchange section (40B). The front plate structure (50) is disposed so as to overlap the front heat exchange section (40A) in the axial direction of the heat transfer tube (42). The rear plate structure (60) is disposed so as to overlap the rear heat exchange section (40B) in the axial direction of the heat transfer tube (42).

[0063] (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 structures (50, 60). The indoor expansion valve (37) is connected to the front plate structure (50) via a first internal piping (38) and is connected to the rear plate structure (60) via a second internal piping (39). The first internal piping (38) and the second internal piping (39) are an example of refrigerant piping that connects a refrigerant passage (51) of the front plate structure (50) and a refrigerant passage (61) of the rear plate structure (60).

[0064] Hereinafter, the first internal pipe (38) and the second internal pipe (39) may be collectively referred to as the internal pipes (38, 39).

[0065] One end of the gas relay pipe (12a) is connected to the rear plate structure (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 structure (50). The other end of the liquid relay pipe (13a) is connected to the second connection pipe (13) via a joint.

[0066] (4) Plate structure The plate structures (50, 60) will be described in detail with reference to FIGS.

[0067] (4-1) Front plate structure The front plate structure (50) includes a front main body portion (52) having a refrigerant passage (51) therein, a plurality of front connecting pipes (53) connecting the plurality of heat transfer tubes (42) of the front heat exchange portion (40A) to the refrigerant passage (51), a front relay portion (54) to which the first internal piping (38) is connected, and a liquid end portion (55) communicating with the second connection piping (13) via the liquid relay pipe (13a).

[0068] As shown in Fig. 5 and Fig. 8, the front main body portion (52) is a thick plate-like member formed by stacking five front plates. The stacking direction of the front plates is the same as the axial direction of the heat transfer tubes (42). In the front plate structure (50), a first front plate (521), a second front plate (522), a third front plate (523), a fourth front plate (524), and a fifth front plate (525) are stacked in order from the side closest to the front heat exchange section (40A). The second front plate (522), the third front plate (523), and the fourth front plate (524) are intermediate plates sandwiched between the first front plate (521) and the fifth front plate (525). The five front plates are flat plate-like members having the same outer edge shape. Each front plate is made of the same material as the heat transfer tube (42) and the front connecting tube (53). In this embodiment, the material of each front plate is an aluminum alloy. The front plates are joined to each other by furnace brazing. Note that the number of front plates is just an example, and the number of front plates may be four or less, or six or more. Hereinafter, when there is no need to distinguish between the front plates, they will simply be referred to as front plates.

[0069] The front connecting pipes (53) include a front main connecting pipe (53a) and a front auxiliary connecting pipe (53b). The front main connecting pipe (53a) is connected to the heat transfer pipe (42) of the front main heat exchange section (43).

[0070] The front connecting pipe (53) is fixed to the first front plate (521). The front connecting pipe (53) may be molded seamlessly and integrally with the first front plate (521).

[0071] 9, the tip of the front connecting pipe (53) is inserted into the end of the corresponding heat transfer pipe (42). In other words, the end of the heat transfer pipe (42) is inserted outside the front connecting pipe (53). The front connecting pipe (53) is inserted into the flare portion (42a) of the corresponding heat transfer pipe (42). The front connecting pipe (53) is inserted into the flare portion (42a) and joined to the cylindrical portion (42c) of the flare portion (42a) by burner brazing.

[0072] 5, the front relay portion (54) is a circular pipe. The front relay portion (54) is provided on the fifth front plate (525). The front relay portion (54) is joined to an end portion of the front first internal pipe (38) by brazing.

[0073] The liquid end portion (55) is a circular pipe and is provided on the fifth front plate (525). The liquid end portion (55) is joined to an end portion of the liquid relay pipe (13a) by brazing.

[0074] (4-2) Rear plate structure The rear plate structure (60) includes a rear main body portion (62) having a refrigerant passage (61) therein, a plurality of rear connecting pipes (63) connecting the plurality of heat transfer tubes (42) of the rear heat exchange portion (40B) and the refrigerant passage (61), a rear relay portion (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).

[0075] The rear body portion (62) has basically the same configuration as the front body portion (52), except that the shape of the outer edge of the plate as viewed in the axial direction of the heat transfer tubes (42) and the internal refrigerant passages (61) are different from those of the front body portion (52). The rear body portion (62) is a thick plate-like member formed by stacking five rear plates. The stacking direction of the rear plates is the same as the axial direction of the heat transfer tubes (42). In the rear plate structure (60), a first rear plate (621), a second rear plate (622), a third rear plate (623), a fourth rear plate (624), and a fifth rear plate (625) are stacked in order from the side closest to the rear heat exchange section (40B). The second rear plate (622), the third rear plate (623), and the fourth rear plate (624) are intermediate plates sandwiched between the first rear plate (621) and the fifth rear plate (625). The rear plates are made of the same material as the heat transfer tubes (42) and the rear connecting tube (63). In this embodiment, the rear plates are made of an aluminum alloy. The five rear plates are joined to each other by furnace brazing. Note that the number of rear plates is just an example, and the number of rear plates may be four or less, or six or more. The number of front plates and the number of rear plates may be different. Hereinafter, when there is no need to distinguish between the rear plates, they will simply be referred to as rear plates.

[0076] The rear connecting pipe (63) is a circular pipe. The second connecting pipe (63) is made of an aluminum alloy. As shown in Fig. 10, the rear connecting pipes (63) are arranged in a manner corresponding to the arrangement of the heat transfer tubes (42) of the rear heat exchange section (40B).

[0077] In the rear plate structure 60, the rear connecting pipes 63 are inserted into the ends of the heat transfer tubes 42. The rear connecting pipes 63 are inserted into the flared portions 42a of the corresponding heat transfer tubes 42. The rear connecting pipes 63 are inserted into the flared portions 42a and joined to the cylindrical portions 42c of the flared portions 42a by burner brazing.

[0078] The rear relay portion (64) is a circular pipe. As shown in Fig. 6, the rear relay portion (64) is provided on the fifth rear plate (625). The rear relay portion (64) is joined to an end of the second internal pipe (39) by brazing.

[0079] The gas end portion (65) is a circular pipe and is provided on the fifth rear plate (625). The gas end portion (65) is joined to an end portion of the gas relay pipe (12a) by brazing.

[0080] (5) Driving behavior The air conditioner (10) performs a cooling operation, a heating operation, and a dehumidifying operation.

[0081] (5-1) Cooling operation In the cooling operation, the controller of the air conditioner (10) operates the compressor (21), the outdoor fan (25), and the indoor fan (32), sets the four-way switching valve (24) to the first state (the state shown by the solid line in FIG. 1), appropriately adjusts the opening degree of the outdoor expansion valve (23), and fully opens the indoor expansion valve (37).

[0082] In the cooling operation, the refrigerant circuit (11) performs a refrigeration cycle in which the outdoor heat exchanger (22) functions as a condenser (heat radiator) and the indoor heat exchanger (40) functions as an evaporator.

[0083] The indoor unit (30) draws indoor air from the indoor space (I) into the air passage (P) through the inlet (33). The air in the air passage (P) is cooled by the indoor heat exchanger (40). The cooled air is supplied to the indoor space (I) through the air outlet (34).

[0084] (5-2) Heating operation In the heating operation, the controller of the air conditioner (10) operates the compressor (21), the outdoor fan (25), and the indoor fan (32), sets the four-way switching valve (24) to the second state (the state shown by the dashed line in FIG. 1), adjusts the opening degree of the outdoor expansion valve (23) to a predetermined opening degree, and fully opens the indoor expansion valve (37).

[0085] In the heating operation, the refrigerant circuit (11) performs a refrigeration cycle in which the indoor heat exchanger (40) functions as a condenser (heat radiator) and the outdoor heat exchanger (22) functions as an evaporator.

[0086] The indoor unit (30) draws indoor air from the indoor space (I) into the air passage (P) through the inlet (33). The air in the air passage (P) is heated by the indoor heat exchanger (40). The heated air is supplied to the indoor space (I) through the air outlet (34).

[0087] (5-3) Dehumidification operation In the dehumidification operation, a controller of the air conditioner (10) operates the compressor (21), the outdoor fan (25), and the indoor fan (32), sets the four-way switching valve (24) to the first state (the state shown by the solid line in FIG. 1), and appropriately adjusts the openings of the outdoor expansion valve (23) and the indoor expansion valve (37).

[0088] During dehumidification operation, the refrigerant circuit (11) performs a refrigeration cycle in which the outdoor heat exchanger (22) and the front heat exchange section (40A) of the indoor heat exchanger (40) function as a condenser (heat radiator), and the rear heat exchange section (40B) of the indoor heat exchanger (40) functions as an evaporator.

[0089] The indoor unit (30) draws room air from the indoor space (I) into the air passage (P) through the inlet (33). The rear heat exchange section (40B) cools the air in the air passage (P) to a temperature equal to or lower than the dew point temperature. The front heat exchange section (40A) heats the air in the air passage (P). The air that has passed through both sections mixes in the air passage (P) to become low-humidity air. The air dehumidified in this manner is supplied to the indoor space (I) through the air outlet (34).

[0090] (6) Refrigerant passage structure of indoor unit 11(a) and 11(b), the refrigerant passage (51) of the front plate structure (50) includes a first branch portion (51a) and a first junction portion (51b). The first branch portion (51a) is connected to the liquid relay pipe (13a). The front connecting pipes (53) include a plurality of first front connecting pipes (531) and a plurality of second front connecting pipes (532). The first branch portion (51a) is connected to each of the first front connecting pipes (531).

[0091] The heat transfer tubes (42) of the front heat exchange section (40A) include a plurality of first front heat transfer tubes (421) and a plurality of second front heat transfer tubes (422). The first front heat transfer tubes (421) and the second front heat transfer tubes (422) are connected to each other by a U-shaped tube (48) or the like. The first front heat transfer tubes (421) correspond to the first front connecting tubes (531) respectively, and are connected to the first front connecting tubes (531) corresponding to each of the first front heat transfer tubes (421). The second front heat transfer tubes (422) correspond to the second front connecting tubes (532) respectively, and are connected to the second front connecting tubes (532) corresponding to each of the second front heat transfer tubes (422).

[0092] The first junction (51b) is connected to each of the plurality of second front connecting pipes (532). The first junction (51b) is connected to the internal pipes (38, 39) (specifically, the first internal pipe (38)).

[0093] The refrigerant passage (61) of the rear plate structure (60) includes a second branch portion (61a) and a second junction portion (61b). The second branch portion (61a) is connected to the internal pipes (38, 39) (specifically, the second internal pipe (39)). The front connecting pipes (53) include first rear connecting pipes (631) and second rear connecting pipes (632).

[0094] The heat transfer tubes (42) of the rear heat exchange section (40B) include a plurality of first rear heat transfer tubes (423) and a plurality of second rear heat transfer tubes (424). The first rear heat transfer tubes (423) and the second rear heat transfer tubes (424) are connected to each other by a U-shaped tube (48) or the like. The first rear heat transfer tubes (423) correspond to the first rear connecting tubes (631) respectively, and are connected to the first rear connecting tubes (631) corresponding to each of the first rear heat transfer tubes (423). The second rear heat transfer tubes (424) correspond to the second rear connecting tubes (632) respectively, and are connected to the second rear connecting tubes (632) corresponding to each of the second rear heat transfer tubes (424).

[0095] The second junction (61b) is connected to each of the plurality of second rear connecting pipes (632). The second junction (61b) is connected to the gas relay pipe (12a).

[0096] In the cooling operation and the dehumidification operation, the refrigerant flows through the liquid relay pipe (13a), the first branch section (51a), the plurality of first front connecting pipes (531), the front heat exchange section (40A) (the plurality of first front heat transfer pipes (421) and the plurality of second front heat transfer pipes (422)), the plurality of second front connecting pipes (532), the first junction section (51b), the internal pipes (38, 39), the second branch section (61a), the plurality of first rear connecting pipes (631), the rear heat exchange section (40B) (the plurality of first rear heat transfer pipes (423) and the plurality of second rear heat transfer pipes (424)), the plurality of second rear connecting pipes (632), the second junction section (61b), and the gas relay pipe (12a), in that order. At this time, the indoor heat exchanger (40) functions as an evaporator, and the refrigerant changes from a liquid state to a gas state in the front heat exchange section (40A) and the rear heat exchange section (40B) by pumping up heat.

[0097] In heating operation, the refrigerant flows in the opposite direction to that in cooling and dehumidifying operations. In this case, the indoor heat exchanger (40) functions as a condenser, and the refrigerant changes from a gas state to a liquid state in the front heat exchange section (40A) and the rear heat exchange section (40B) by releasing heat.

[0098] (7) Temperature sensor installation structure The indoor heat exchanger (40) includes a temperature sensor (70). The temperature sensor (70) detects the temperature of the refrigerant. The temperature sensor (70) includes a thermistor.

[0099] The temperature sensor (70) is provided in the piping section. The piping section is a tubular member. The piping section is in communication with at least one of the heat transfer tube (42) and the refrigerant passages (51, 61). The piping section is connected between the first branch section (51a) and the second junction section (61b). In other words, the piping section is provided so that the refrigerant flowing from one of the first branch section (51a) and the second junction section (61b) to the other passes through the piping section on the way therethrough. Examples of the piping section in this case include a first piping section (81) (see FIG. 12(a)), a second piping section (82) (see FIG. 13), a third piping section (83) (see FIG. 14), a fourth piping section (84) (see FIG. 16), a fifth piping section (85) (see FIG. 17), and a sixth piping section (86) (see FIG. 18) described below.

[0100] The piping section is preferably connected between the front heat exchange section (40A) and the rear heat exchange section (40B). That is, the piping section is preferably provided so that the refrigerant flowing from one of the front heat exchange section (40A) and the rear heat exchange section (40B) to the other passes through the piping section on the way thereto. Examples of the piping section in this case include a fourth piping section (84) (see FIG. 16), a fifth piping section (85) (see FIG. 17), and a sixth piping section (86) (see FIG. 18) described below. A refrigerant in a gas-liquid two-phase state, in which gas refrigerant and liquid refrigerant are mixed, flows through the piping section.

[0101] (7-1) First piping section As shown in Figures 12(a) to 12(c), the piping section includes a first piping section (81). The temperature sensor (70) may be provided in the first piping section (81).

[0102] The first piping section (81) is not in communication with the refrigerant passages (51, 61) of the plate structures (50, 60) but is in communication with the two heat transfer tubes (42) of the front heat exchange section (40A). The first piping section (81) has a U-shape. One end of the first piping section (81) is in communication with one of the heat transfer tubes (42) of the front heat exchange section (40A), and the other end of the first piping section (81) is in communication with the other of the heat transfer tubes (42) of the front heat exchange section (40A). The refrigerant flowing through one of the heat transfer tubes (42) of the front heat exchange section (40A) is sent to the other heat transfer tube (42) through the first piping section (81).

[0103] The first piping section (81) may have a structure in which it communicates with the two heat transfer tubes (42) of the rear heat exchange section (40B) without communicating with the refrigerant passages (51, 61) of the plate structures (50, 60).

[0104] A first example of a configuration for providing the temperature sensor (70) in the piping section will be described below. Here, a configuration for providing the temperature sensor (70) in the first piping section (81) will be described.

[0105] As shown in FIGS. 12(a) to 12(c), the indoor heat exchanger (40) includes a first sensor mounting portion (90). The first sensor mounting portion (90) is a member for mounting the temperature sensor (70) to a piping portion such as the first piping portion (81). The first sensor mounting portion (90) includes a mounting member (91) that houses the temperature sensor (70) and a brazing portion (92) that mounts the mounting member (91) to a surface of the first piping portion (81). The mounting member (91) is attached to the first piping portion (81) via the brazing portion (92).

[0106] 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 first piping section (81). The brazed portion (92) is configured, for example, to extend linearly. The brazed portion (92) is formed, for example, by supplying brazing material between the mounting member (91) and the first piping section (81) and heating the brazed portion (92) with the flame of a burner.

[0107] 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.

[0108] The first piping section (81), the temperature sensor (70), and the mounting member (91) are all made of materials with the same potential, and have a higher potential than the sacrificial layer and a lower potential than the brazed portion (92). At least a portion of the brazed portion (92), which constitutes a part of the mounting member (91), is attached to a surface of the first piping section (81) on which no sacrificial layer is provided. Because at least a portion of the mounting member (91) is attached to a part of the surface of the first piping section (81) on which no sacrificial layer is provided, even if the sacrificial layer corrodes, it is possible to prevent the temperature sensor (70) from falling off from the aluminum first piping section (81).

[0109] The mounting member (91) and the piping portion, such as the first piping portion (81), 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 portion.

[0110] (7-2) Second piping section As shown in Fig. 13, the piping section includes a second piping section (82). The temperature sensor (70) may be provided in the second piping section (82).

[0111] The second piping section (82) is provided outside the first plate structure (50) and has both ends connected to the refrigerant passages (51) of the first plate structure (50). Both ends of the second piping section (82) are connected to, for example, the refrigerant passages (51) that form the first junction (51b) (see FIG. 11(b)). The refrigerant flowing through the refrigerant passages (51) is sent from one end of the second piping section (82) to the second piping section (82) and then returns to the refrigerant passages (51) from the other end of the second piping section (82).

[0112] The second piping section (82) may be provided outside the second plate structure (60) and both ends may be in communication with the refrigerant passages (61) of the second plate structure (60). In this case, both ends of the second piping section (82) are in communication with, for example, the refrigerant passages (61) that form the second branch section (61a).

[0113] (7-3) Third piping section As shown in Fig. 14, the piping section includes a third piping section (83). The temperature sensor (70) may be provided in the third piping section (83).

[0114] The third piping section (83) is provided between the front heat exchange section (40A) and the front plate structure (50). The third piping section (83) communicates with the heat transfer tube (42) of the front heat exchange section (40A) and the refrigerant passage (51) of the front plate structure (50). In this embodiment, the third piping section (83) is the front connecting tube (53). Note that the third piping section (83) may be a pipe that is integrally formed with the heat transfer tube (42) of the front heat exchange section (40A), extends from the heat transfer tube (42) of the front heat exchange section (40A) toward the front plate structure (50), and is connected to the refrigerant passage (51) of the front plate structure (50).

[0115] The third piping section (83) may be provided between the rear heat exchange section (40B) and the rear plate structure (60). In this case, the third piping section (83) communicates with the heat transfer tube (42) of the rear heat exchange section (40B) and the refrigerant passage (61) of the rear plate structure (60). In this case, the third piping section (83) is the rear connecting tube (63). Note that the third piping section (83) may be a pipe that is integrally formed with the heat transfer tube (42) of the rear heat exchange section (40B), extends from the heat transfer tube (42) of the rear heat exchange section (40B) toward the rear plate structure (60), and is connected to the refrigerant passage (61) of the rear plate structure (60).

[0116] A second example of a configuration for providing the temperature sensor (70) in the piping section will be described below. Here, a configuration for providing the temperature sensor (70) in the third piping section (83) will be described.

[0117] As shown in Fig. 15(a) and Fig. 15(b), the indoor heat exchanger (40) includes a second sensor attachment portion (95). The second sensor attachment portion (95) is a clip-shaped member. The second sensor attachment portion (95) is made of, for example, stainless steel. The third piping portion (83) and the temperature sensor (70) are sandwiched between the second sensor attachment portion (95), whereby the temperature sensor (70) is attached to the third piping portion (83).

[0118] The mounting member (91) (see FIG. 12(a)) and the second sensor mounting portion (95) (see FIG. 15(a)) may support the temperature sensor (70) such that the longitudinal direction of the temperature sensor (70) is inclined with respect to the horizontal direction. This makes it possible to prevent water from accumulating in the temperature sensor (70), thereby preventing corrosion of the temperature sensor (70).

[0119] (7-4) 4th piping section 16, the piping section includes a fourth piping section (84). The temperature sensor (70) may be provided in the fourth piping section (84).

[0120] The fourth piping section (84) communicates with the refrigerant passages (51) formed in the front plate structure (50) and the refrigerant passages (61) formed in the rear plate structure (60). In this embodiment, the third piping section (83) is the first internal piping (38) or the second internal piping (39). In FIG. 16, the indoor expansion valve (37) provided in the internal piping (38, 39) is omitted. The first internal piping (38) or the second internal piping (39), which is the third piping section (83), may have a portion overlapping with the front plate structure (50) in a front view (a viewpoint when the indoor unit (30) is viewed from the front) (see FIG. 5).

[0121] (7-5) Fifth piping section As shown in Fig. 17, the piping section includes a fifth piping section (85). The fifth piping section (85) communicates with a refrigerant passage (51) formed in the front plate structure (50) and a heat transfer tube (42) of the rear heat exchange section (40B). The temperature sensor (70) may be provided in the fifth piping section (85). The fifth piping section (85) may be a pipe that communicates with a refrigerant passage (61) formed in the rear plate structure (60) and a heat transfer tube (42) of the front heat exchange section (40A). In Fig. 17, an indoor expansion valve (37) provided in the fifth piping section (85) is omitted.

[0122] (7-6) 6th piping section As shown in Fig. 18, the piping section includes a sixth piping section (86). The sixth piping section (86) communicates with the heat transfer tube (42) of the front heat exchange section (40A) and the heat transfer tube (42) of the rear heat exchange section (40B). The temperature sensor (70) may be provided in the sixth piping section (86). In Fig. 18, the indoor expansion valve (37) provided in the sixth piping section (86) is omitted.

[0123] (8) Effects of the embodiment If the temperature sensor (70) were provided on the plate structure (50, 60), the refrigerant flowing through the refrigerant passages (51, 61) of the plate structure (50, 60) would undergo thermal diffusion due to thermal conduction in the plate material constituting the plate structure (50, 60), which may result in a decrease in accuracy in detecting the refrigerant. In contrast, in this embodiment, the temperature sensor (70) is provided on the heat transfer tube (42) or on a piping section (any of the first piping section (81) to the sixth piping section (86)) communicating with the refrigerant passages (51, 61). This reduces thermal diffusion of the refrigerant in the piping section more than in the plate structure (50, 60), and therefore the temperature of the refrigerant can be detected with high accuracy.

[0124] Furthermore, by providing a temperature sensor (70) in the piping section through which the refrigerant in a gas-liquid two-phase state flows and configuring the temperature sensor (70) to detect the temperature of the refrigerant in the gas-liquid two-phase state, the temperature of the refrigerant in the gas-liquid two-phase state is more stable than the temperature of the refrigerant in a single-phase state (gas or liquid state), and therefore the temperature of the refrigerant can be detected with high accuracy.

[0125] (9) Variations The above-described indoor heat exchanger (40) may have the following modified configuration. The following describes the differences from the above-described embodiment.

[0126] In the modified example, as shown in Fig. 19, the front plate structure (50) is formed of a single plate. The front plate structure (50) of the modified example has a refrigerant passage formed therein, as in the above-described embodiment. The front plate structure (50) of the modified example is manufactured by sintering metal powder using a 3D printer. The rear plate structure (60) may also be formed of a single plate.

[0127] (10) Other embodiments The indoor heat exchanger (40) does not have to be of a fin-and-tube type and may be of, for example, a corrugated type in which corrugated fins are arranged between adjacent heat transfer tubes.

[0128] As shown in FIGS. 20(a) and 20(b), the indoor heat exchanger (40) may have one heat exchange section, without including the front heat exchange section (40A) and the rear heat exchange section (40B). In this case, the first internal pipe (38), the second internal pipe (39), and the indoor expansion valve (37) are omitted. In this case, the indoor heat exchanger (40) includes one heat exchange section (100) and one plate structure (110). The refrigerant passage (111) of the plate structure (110) includes a branch section (111a) and a junction section (111b). The heat transfer tube (101) of the heat exchange section (100) includes a plurality of first heat transfer tubes (101a) and a plurality of second heat transfer tubes (101b). The first heat transfer tubes (101a) and the second heat transfer tubes (101b) are connected to each other by a U-shaped tube (48). The branching section (111a) is connected to the liquid relay pipe (13a). The branching section (111a) is connected to the first heat transfer tubes (101a) via the connecting pipes (112). The junction section (111b) is connected to the gas relay pipe (12a). The junction section (111b) is connected to the second heat transfer tubes (101b) via the connecting pipes (113). The piping section in which the temperature sensor (70) is provided is connected between the branching section (111a) and the junction section (111b). That is, the piping section is provided such that the refrigerant flowing from one of the branching section (111a) and the junction section (111b) to the other passes through the piping section midway. In this case, examples of the piping section include the first piping section (81) (see FIG. 12(a)), the second piping section (82) (see FIG. 13), and the third piping section (83) (see FIG. 14).

[0129] The heat transfer tubes (42) of the heat exchanger body (B) may be made of a copper alloy instead of an aluminum alloy. When the heat transfer tubes (42) are made of a copper alloy, it is preferable that the plate structures (50, 60) are also made of a copper alloy. When the heat transfer tubes (42) are made of a copper alloy, it is preferable that the first piping section (81) and the mounting member (91) are also made of a copper alloy.

[0130] The connecting pipes (53, 63) may be made of a copper alloy or stainless steel (SUS) instead of aluminum. In this case, the plate structures (50, 60) are preferably made of the same material as the connecting pipes (53, 63).

[0131] When a gas-liquid two-phase refrigerant flows through the refrigerant passages (51, 61, 111) of the plate structure (50, 60, 110), a temperature sensor (70) may be attached (provided) to the plate structure (50, 60, 110).

[0132] 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, modifications, and other embodiments may be appropriately combined or substituted as long as the functions of the subject of the present disclosure are not impaired.

[0133] The descriptions "first," "second," "third," etc. mentioned 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]

[0134] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for indoor heat exchangers, refrigeration cycle devices, and air conditioner indoor units. [Explanation of symbols]

[0135] 11 Refrigerant circuit 31 Casing 40 Indoor heat exchanger 40A Front heat exchanger 40B Rear heat exchange section 41 Finn 42 Heat transfer tube 42a Flare section 50 Front plate structure 51 Refrigerant passage 60 Rear plate structure 61 Refrigerant passage 70 Temperature Sensor

Claims

1. a heat exchange section (40A, 40B) having fins (41) and a heat transfer tube (42); a plate structure (50, 60) to which the heat transfer tube (42) is connected and in which a refrigerant passage (51, 61) is formed; a piping portion communicating with the heat transfer tube (42) or the refrigerant passage (51, 61); Equipped with The indoor heat exchanger, wherein a temperature sensor (70) for detecting a temperature of the refrigerant is provided in the piping portion.

2. The indoor heat exchanger according to claim 1 , wherein the temperature sensor ( 70 ) is attached to the piping portion via a mounting member ( 91 ).

3. 3. The indoor heat exchanger according to claim 2, wherein the mounting member (91) and a portion of the piping at which the temperature sensor (70) is attached are made of the same type of metal.

4. The heat exchange section (40A, 40B) includes a tube plate (49) facing the plate structure (50, 60), 2. The indoor heat exchanger according to claim 1, wherein a distance between the tube sheet and the plate structure (50, 60) is 35 mm or less.

5. the piping section includes a first piping section (81) that does not communicate with the refrigerant passages (51, 61) but communicates with the two heat transfer tubes (42), The indoor heat exchanger according to claim 1, wherein the temperature sensor (70) is provided in the first piping section (81).

6. the piping section includes a second piping section (82) provided outside the plate structure (50, 60) and having both ends communicating with the refrigerant passage (51, 61), The indoor heat exchanger according to claim 1, wherein the temperature sensor (70) is provided in the second piping section (82).

7. the piping section includes a third piping section (83) provided between the heat exchange section (40A, 40B) and the plate structure (50, 60), The indoor heat exchanger according to claim 1, wherein the temperature sensor (70) is provided in the third piping section (83).

8. The heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the plate structures (50, 60) include a first plate structure (50) to which a heat transfer tube (42) of the first heat exchange section (40A) is connected, and a second plate structure (60) to which a heat transfer tube (42) of the second heat exchange section (40B) is connected, the piping section includes a fourth piping section (84) communicating with a refrigerant passage (51, 61) formed in the first plate structure (50) and a refrigerant passage (51, 61) formed in the second plate structure (60), The indoor heat exchanger according to claim 1, wherein the temperature sensor (70) is provided in the fourth piping section (84).

9. The heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the plate structures (50, 60) include a first plate structure (50) to which a heat transfer tube (42) of the first heat exchange section (40A) is connected, and a second plate structure (60) to which a heat transfer tube (42) of the second heat exchange section (40B) is connected, the piping section includes a fifth piping section (85) communicating with a refrigerant passage (51, 61) formed in the first plate structure (50) and a heat transfer tube (42) of the second heat exchange section (40B), The indoor heat exchanger according to claim 1, wherein the temperature sensor (70) is provided in the fifth piping section (85).

10. The heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), the piping section includes a sixth piping section (86) communicating with a heat transfer tube (42) of the first heat exchange section (40A) and a heat transfer tube (42) of the second heat exchange section (40B); The indoor heat exchanger according to claim 1 , wherein the temperature sensor (70) is provided in the sixth piping section (86).

11. The refrigerant passage (111) of the plate structure (110) is a flow dividing section (111a) for dividing a refrigerant to be flowed into the heat exchange section (100); a junction (111b) for merging the refrigerants flowing out from the heat exchange section (100); Including, The indoor heat exchanger according to claim 1 , wherein the piping portion is connected between the branch portion ( 111 a ) and the junction portion ( 111 b ).

12. The heat exchange section (40A, 40B) includes a first heat exchange section (40A) and a second heat exchange section (40B), 12. The indoor heat exchanger according to claim 11, wherein the refrigerant divided by the dividing portion (51a) flows into the first heat exchange portion (40A), and the refrigerant flowing out of the second heat exchange portion (40B) is joined together by the joining portion (61b).

13. The indoor heat exchanger according to claim 1 , wherein a gas-liquid two-phase refrigerant flows through the piping portion.

14. A refrigeration cycle apparatus comprising a refrigerant circuit (11) to which the indoor heat exchanger according to any one of claims 1 to 12 is connected.

15. An indoor heat exchanger according to any one of claims 1 to 12; a casing (31) that houses the indoor heat exchanger; An air conditioning indoor unit equipped with:

Images