WO2019150864A1 - Refrigeration device - Google Patents

Abstract

A decline of heat exchange performance is suppressed in this refrigeration device which has bent sections in flat tubes that are arranged in a plurality of rows. A heat source-side heat exchanger (10) of an air conditioning device, which is a refrigeration device, is provided with: flat tubes (63, 64) arranged in two rows; heat transfer fins (65, 66); a first header collection pipe (110), which is a first gas collection member; a connecting pipe (161); and a gas collection pipe (160), which is a second gas collection member. When viewed along a lengthwise direction of the first header collection pipe (110), the centroid (169) of the gas collection pipe (160) is positioned on the side opposite the flat tube (64) with respect to a virtual straight line (L1) obtained by virtually extending the centerline of the flat tube (63) from the first header collection pipe (110) in the direction in which the flat tube (63) extends.

Description

Refrigeration equipment

Refrigeration equipment with flat tubes through which refrigerant flows for heat exchange

Conventionally, a refrigeration apparatus including a heat exchanger as described in, for example, Patent Document 1 (International Publication No. 2013/161799) is known.

The heat exchanger of the refrigeration apparatus described in Patent Document 1 has a bent portion in which a flat tube is bent. In the heat exchanger described in Patent Literature 1, the flat tubes are arranged in two rows in the air flow direction, and the position of the collecting tube connected to the end of the flat tube when the bent portion is formed Shifts. In order to avoid the interference of members due to the displacement of the collecting pipe, the heat exchange performance of the refrigeration apparatus may deteriorate.

The problem of the present disclosure is to suppress a decrease in heat exchange performance in a refrigeration apparatus having a bent portion in flat tubes arranged in a plurality of rows.

The refrigeration apparatus according to the first aspect includes a plurality of first flat tubes and a plurality of second flat tubes arranged in two rows in the direction of air flow, and a plurality of first flat tubes and a plurality of second flat tubes, respectively. A plurality of first heat transfer fins and a plurality of second heat transfer fins attached, a first gas collecting member to which ends of the plurality of first flat tubes are connected, and at least extending from the first gas collecting member One connecting pipe and a second gas collecting member communicated with the first gas collecting member by the connecting pipe, and the second gas collecting member is a first gas as viewed in the longitudinal direction of the first gas collecting member. A centroid is located on the opposite side of the plurality of second flat tubes with respect to an imaginary straight line obtained by virtually extending the center line of the first flat tubes in the direction in which the plurality of first flat tubes extend from the assembly member.

In the refrigeration apparatus having such a configuration, the centroid of the second gas collecting member is located on the opposite side of the second flat tube with respect to the virtual straight line passing through the center of the first flat tube. When bending the tube and the plurality of second flat tubes, the distance between the first heat transfer fins and the second heat transfer fins is set to a limit where members around the end of the second flat tube do not interfere with the second gas collecting member. It can be made small, and a decrease in heat exchange performance can be suppressed.

The refrigerating apparatus according to the second aspect is the refrigerating apparatus according to the first aspect, wherein the second gas collecting member has a vertical cross-sectional area of the internal space with respect to the longitudinal direction larger than a vertical cross-sectional area of the internal space of the first gas collecting member. , That is. In the refrigeration apparatus configured as described above, since the pressure loss of the refrigerant can be reduced by increasing the vertical sectional area of the second gas collecting member, the first gas having a smaller vertical sectional area than the second gas collecting member. The heat exchange performance can be improved as compared with the case of piping directly from the assembly member.

The refrigeration apparatus according to the third aspect is the refrigeration apparatus according to the first aspect or the second aspect, further comprising a liquid collecting member to which ends of the plurality of second flat tubes are connected, and the plurality of first flat tubes and The plurality of second flat tubes have a bent portion that is bent in the same direction as viewed in the longitudinal direction, and the liquid collecting member is opposite to the second gas collecting member on the opposite side of the first gas collecting member before forming the bent portion. In addition, the liquid collecting member is bent so as to be located on the same side as the first gas collecting member with respect to the second gas collecting member after the bent portion is formed. In the refrigeration apparatus having such a configuration, the interference between the second gas collecting member and the liquid collecting member when the bent portion is formed even if the distance that allows the first flat tube and the second flat tube to be close to each other is reduced. Since it can avoid, the distance of a 1st heat transfer fin and a 2nd heat transfer fin can be made small, and the refrigeration apparatus with favorable heat exchange performance can be provided easily.

A refrigeration apparatus according to a fourth aspect is the refrigeration apparatus according to the third aspect, wherein the bending portion presses the bending member against the first heat transfer fin and / or the second heat transfer fin, and the plurality of first flat tubes and the plurality of first flat tubes. The second flat tube is bent and formed. In the refrigeration apparatus having such a configuration, since interference between the second gas collecting member and the members around the end of the second flat tube is suppressed, the curvature at the bent portion can be increased, and a plurality of first flat members can be formed. Damage to the tube, the plurality of second flat tubes, the plurality of first heat transfer fins, and the plurality of second heat transfer fins can be suppressed.

A refrigeration apparatus according to a fifth aspect is the refrigeration apparatus according to any one of the first to fourth aspects, wherein at least one connection pipe communicates the first gas collecting member and the second gas collecting member. A thing that is a tube. In the refrigeration apparatus having such a configuration, the first gas collecting member and the second gas collecting member are reduced in communication with the first gas collecting member and the second gas collecting member through a plurality of connecting pipes, thereby reducing the inner diameter of the connecting pipe. Since the flow passage area for communicating with the gas collecting member can be secured, the pressure loss in the connecting pipe can be suppressed and the deterioration of the heat exchange performance can be suppressed.

A refrigeration apparatus according to a sixth aspect is the refrigeration apparatus according to any one of the first to fifth aspects, wherein the connection pipe is opposite to the plurality of second flat pipes with respect to the virtual straight line when viewed in the longitudinal direction. It's bent. In the refrigeration apparatus having such a configuration, the centroid of the second gas collecting member can be easily placed on the side opposite to the plurality of second flat tubes by using a connecting pipe bent to the side opposite to the second flat tubes. Can be positioned.

The refrigeration apparatus according to the seventh aspect is the refrigeration apparatus according to the sixth aspect, wherein one end of the connecting pipe is elliptical. In the refrigeration apparatus having such a configuration, the bending direction of the connecting pipe can be made uniform by inserting an elliptical end, so that the first gas collecting member and the second gas collecting member are communicated by the connecting pipe. Assembling becomes easy and the cost of the refrigeration apparatus can be reduced.

The refrigeration apparatus according to the eighth aspect is the refrigeration apparatus according to any one of the fifth to seventh aspects, in which the connection pipe is tapered at least one of both end portions. In the refrigeration apparatus having such a configuration, even if the connecting pipe is bent, the connecting pipe can be easily introduced into the holes of the first gas collecting member and the second gas collecting member by a taper, and the assembly can be easily performed. The cost of the apparatus can be reduced.

A refrigeration apparatus according to a ninth aspect is the refrigeration apparatus according to any one of the first to eighth aspects, wherein the connection pipe is directed to the opposite side of the plurality of second flat tubes with respect to the virtual straight line. It extends from the member. In the refrigeration apparatus having such a configuration, the centroid of the second gas collecting member can be easily positioned on the side opposite to the plurality of second flat tubes.

The figure which shows an example of the refrigerant circuit of the air conditioning apparatus of this indication. The perspective view which shows a heat-source unit. The top view which shows the heat source side heat exchanger, compressor, etc. on the bottom frame of a heat source unit. The perspective view which shows a heat source side heat exchanger. The perspective view which shows a heat exchange part. The disassembled perspective view which shows a 1st header collecting pipe and a gas collecting pipe. The top view which shows a 1st header collecting pipe and a gas collecting pipe mutually overlapping. The top view which shows the surrounding structure of a 1st header collecting pipe, a gas collecting pipe, and a 2nd header collecting pipe. The top view for demonstrating the bending member which bends a heat source side heat exchanger. The top view for demonstrating the process of bending a heat source side heat exchanger. The side view which shows the gas collecting pipe and reverse U-shaped pipe before brazing. The side view which shows the gas collecting pipe and reverse U-shaped pipe after brazing. The disassembled perspective view which shows a 1st header collecting pipe and a gas collecting pipe. The enlarged side view which expanded a part of piping side member. The enlarged plan view which expanded the upper part of the piping side member. The enlarged side view which expanded a part of piping side member. The perspective view which shows a connecting pipe. The top view which shows a connecting pipe. The side view which shows a connecting pipe. The disassembled perspective view which shows the 2nd header collecting pipe. The disassembled perspective view which expands and shows a part of 2nd header collecting pipe. The expansion perspective view which shows a partition member, a baffle plate, and a partition plate. The top view of the 2nd header collecting pipe. The partial expanded sectional view which expands and shows a part of 2nd header collecting pipe. The perspective view which shows a connection header. The expansion perspective view which expands and shows the upper part of a connection header. The figure which shows typically the cross-section of the connection header along the II line | wire of FIG. The figure which shows typically the cross-section of the connection header along the II-II line of FIG. The partially broken expanded sectional view which shows the 1st header collecting pipe which concerns on modification 1A, a connection pipe, and a gas collecting pipe.

(1) Overall Configuration An air conditioner is shown in FIG. 1 as an example of a refrigeration apparatus according to an embodiment of the present disclosure. Here, the refrigeration apparatus consumes power in the compressor 8 as in the air conditioner shown in FIG. 1, and starts from one of the heat source side heat exchanger 10 and the use side heat exchangers 36 a and 36 b. It is a device that takes in heat and discharges heat from the other. In addition to the air conditioner, the refrigeration apparatus includes, for example, a heat pump water heater that supplies hot water and a refrigerator that cools the interior of the refrigerator.

An air conditioner 1 shown in FIG. 1 includes a heat source unit 2, two usage units 3a and 3b, a liquid refrigerant communication tube 4 and a gas refrigerant communication tube connecting the heat source unit 2 and the usage units 3a and 3b. 5. The air conditioner 1 has a function of cooling and heating a room such as a building where the use units 3a and 3b are installed. The refrigerant circuit 6 of the air conditioner 1 is configured by connecting the heat source unit 2 and the utilization units 3a and 3b via the liquid refrigerant communication tube 4 and the gas refrigerant communication tube 5. As the refrigerant circulates in the refrigerant circuit 6, the refrigerant is compressed and heated up, radiated, radiated, decompressed and expanded, absorbed heat, and returned to the state before being compressed. . When the refrigeration cycle is repeated, the refrigerant alternately repeats a low pressure state and a high pressure state. The heat source unit 2 is installed, for example, outside a building, for example, on the roof of a building or in the vicinity of a wall surface of the building.

The heat source unit 2 includes an accumulator 7, a compressor 8, a four-way switching valve 11, a heat source side heat exchanger 10, a heat source side expansion valve 12, a liquid side closing valve 13, a gas side closing valve 14, and a heat source side fan 15. ing. In the heat source unit 2, the third port 11 c of the four-way switching valve 11 and the inlet pipe of the accumulator 7 are connected by a refrigerant pipe 16. The outlet pipe of the accumulator 7 and the suction port of the compressor 8 are connected by a refrigerant pipe 17. A discharge port of the compressor 8 and the first port 11 a of the four-way switching valve 11 are connected by a refrigerant pipe 18. The second port 11 b of the four-way switching valve 11 and the gas side inlet / outlet port of the heat source side heat exchanger 10 are connected by a refrigerant pipe 19. A liquid side inlet / outlet of the heat source side heat exchanger 10 and one inlet / outlet of the expansion valve 12 are connected by a refrigerant pipe 20. The other inlet / outlet of the expansion valve 12 and the liquid side closing valve 13 are connected by a refrigerant pipe 21. The gas side closing valve 14 and the fourth port 11 d of the four-way switching valve 11 are connected by a refrigerant pipe 22.

The use units 3a and 3b are installed in a room such as a living room or a ceiling space. The usage unit 3a includes a usage-side expansion valve 31a, a usage-side heat exchanger 32a, and a usage-side fan 33a. The usage unit 3b includes a usage-side expansion valve 31b, a usage-side heat exchanger 32b, and a usage-side fan. 33b. The liquid refrigerant communication tube 4 is connected to one inlet / outlet of the two expansion valves 31a and 31b. The other entrance / exit of the expansion valve 31a is connected to one entrance / exit of the use side heat exchanger 32a, and the other entrance / exit of the expansion valve 31b is connected to the one entrance / exit of the use side heat exchanger 32b. And the gas refrigerant communication pipe 5 and the other entrance / exit of two utilization side heat exchangers 32a and 32b are connected.

(2) Operation of the air conditioner 1 (2-1) Cooling operation In the air conditioner 1 during the cooling operation, the compressor 8 starts the heat source side heat exchanger 10, the expansion valve 12, the expansion valve 31a, and the use side heat exchanger. A circulation path that passes through 32a and returns to the compressor 8 again, and passes from the compressor 8 to the compressor 8 again through the heat source side heat exchanger 10, the expansion valve 12, the expansion valve 31b, and the use side heat exchanger 32b. At least one of the returning circulation paths is formed. For example, one of the expansion valves 31a and 31b can be closed and one of the two paths can be closed. In order to form these paths, during the cooling operation, a path from the first port 11a to the second port 11b is formed inside the four-way switching valve 11, and a path from the third port 11c to the fourth port 11d. The four-way switching valve 11 is switched so that a state is formed (a state indicated by a solid line in FIG. 1). Here, in the vapor compression refrigeration cycle, the refrigerant is a gas refrigerant made of a substantially gaseous refrigerant, a liquid refrigerant made of a substantially liquid refrigerant, and a gas state and a liquid state refrigerant. The case where the refrigerant changes to a mixed gas-liquid two-phase state will be described as an example.

In the refrigerant circuit 6 during the cooling operation, low-pressure gas refrigerant is sucked from the suction port of the compressor 8, and after being compressed by the compressor 8, high-pressure gas refrigerant is discharged from the discharge port of the compressor 8. The high-pressure gas refrigerant is sent from the compressor 8 to the heat source side heat exchanger 10 through the refrigerant pipe 18, the four-way switching valve 11, and the refrigerant pipe 19. The high-temperature and high-pressure gas refrigerant radiates heat by exchanging heat with the air that is passed through the heat source side heat exchanger 10 by the heat source side fan 15 in the heat source side heat exchanger 10 that functions as a refrigerant radiator. Becomes a high-pressure liquid refrigerant. The high-pressure liquid refrigerant is sent from the heat source side heat exchanger 10 to the expansion valves 31 a and 31 b through the refrigerant pipe 20, the expansion valve 12, the refrigerant pipe 21, the liquid side closing valve 13, and the liquid refrigerant communication pipe 4. At this time, the expansion valve 12 of the heat source unit 2 is in a fully open state, for example, and allows the refrigerant to pass therethrough without reducing the pressure. The refrigerant sent to the use side expansion valves 31a and 31b is decompressed by the expansion valves 31a and 31b to become a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant is sent from the expansion valves 31a and 31b to the use side heat exchangers 32a and 32b. The refrigerant in the low-pressure gas-liquid two-phase state is between the indoor air that is passed through the use side heat exchangers 32a and 32b by the use side fans 33a and 33b in the use side heat exchangers 32a and 32b functioning as an evaporator. The heat exchange is performed to absorb the heat and become a low-pressure gas refrigerant. The room air is cooled by supplying the room air cooled in the use side heat exchangers 32a and 32b into the room. The low-pressure gas refrigerant passes from the use side heat exchangers 32a and 32b through the gas refrigerant communication pipe 5, the gas side closing valve 14, the refrigerant pipe 22, the four-way switching valve 11, the refrigerant pipe 16, the accumulator 7, and the refrigerant pipe 17. Then, it is sucked into the compressor 8 again.

(2-2) Heating Operation In the air conditioning apparatus 1 during the heating operation, the compressor 8 passes through the use side heat exchanger 32a, the expansion valve 31a, the expansion valve 12, and the heat source side heat exchanger 10 from the compressor 8 again. At least one of the circulation path returning to the compressor 8 and the circulation path returning from the compressor 8 to the compressor 8 again after passing through the use side heat exchanger 32b, the expansion valve 31b, the expansion valve 12, and the heat source side heat exchanger 10. A path is formed. For example, one of the expansion valves 31a and 31b can be closed and one of the two paths can be closed. In order to form these paths, during the heating operation, a path from the first port 11a to the fourth port 11d is formed inside the four-way switching valve 11, and a path from the second port 11b to the third port 11c. The four-way switching valve 11 is switched so as to be in a state (state shown by a broken line in FIG. 1).

In the refrigerant circuit 6 during the heating operation, low-pressure gas refrigerant is sucked from the suction port of the compressor 8, and after being compressed by the compressor 8, high-pressure gas refrigerant is discharged from the discharge port of the compressor 8. The high-pressure gas refrigerant is sent from the compressor 8 to the use side heat exchangers 32a and 32b through the refrigerant pipe 18, the four-way switching valve 11, the refrigerant pipe 22, the gas side closing valve 14, and the gas refrigerant communication pipe 5. . The high-temperature and high-pressure gas refrigerant is heated between the use- side heat exchangers 32a and 32b functioning as a refrigerant radiator and the room air passed through the use- side heat exchangers 32a and 32b by the use- side fans 33a and 33b. It exchanges and dissipates heat to become a high-pressure liquid refrigerant. Indoor air is heated by supplying indoor air heated in the use side heat exchangers 32a and 32b into the room. The high-pressure liquid refrigerant is sent from the use side heat exchangers 32a and 32b to the expansion valve 12 through the expansion valves 31a and 31b, the liquid refrigerant communication pipe 4, the liquid side closing valve 13 and the refrigerant pipe 21. At this time, the expansion valves 31a and 31b of the utilization units 3a and 3b are in a fully open state, for example, and allow the refrigerant to pass through without being decompressed. The refrigerant sent to the expansion valve 12 of the heat source unit 2 is decompressed by the expansion valve 12 and becomes a low-pressure gas-liquid two-phase refrigerant. The low-pressure gas-liquid two-phase refrigerant is sent from the expansion valve 12 to the heat source side heat exchanger 10. In the heat source side heat exchanger 10 functioning as an evaporator, the low-pressure gas-liquid two-phase refrigerant exchanges heat with air that is passed through the heat source side heat exchanger 10 by the heat source side fan 15 to absorb heat. And it becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant passes through the refrigerant pipe 19, the four-way switching valve 11, the refrigerant pipe 16, the accumulator 7 and the refrigerant pipe 17 from the heat source side heat exchanger 10 and is again sucked into the compressor 8.

(3) Configuration of Heat Source Unit 2 FIG. 2 shows a state in which the heat source unit 2 is viewed obliquely from above. The heat source unit 2 further includes a casing 40, and the accumulator 7, the compressor 8, the four-way switching valve 11, the heat source side heat exchanger 10, the expansion valve 12, and the heat source side fan 15 are accommodated in the casing 40. In the following description, “upper”, “lower”, “left”, “right”, “front”, and “rear” of the heat source unit 2 are the coordinates described in FIG. 2 unless otherwise specified. Means the direction shown. The heat source unit 2 is a heat exchange unit that draws air into the inside from the side surface of the casing 40 and blows out the air heat-exchanged in the casing 40 upward from the top surface of the casing 40.

The casing 40 includes a bottom frame 42 that spans a pair of installation legs 41 that extend in the left-right direction, a column 43 that extends in a vertical direction from a corner of the bottom frame 42, and a blowout grill that is attached near the upper end of the column 43. 44 and a front panel 45. Air inlets 40a, 40b, 40c, and 40d are provided on the side surface of the casing 40, and an air outlet 40e is provided on the top surface. The air outlet 40 e is covered with an air outlet grill 44, and the heat source side fan 15 is disposed facing the air outlet grill 44.

The bottom frame 42 forms the bottom surface of the casing 40, and the heat source side heat exchanger 10, the accumulator 7 and the compressor 8 are attached on the bottom frame 42. In FIG. 3, the heat source side heat exchanger 10, the four-way switching valve 11, the refrigerant pipe 16, the accumulator 7, the refrigerant pipe 17, the compressor 8, the refrigerant pipe 18, and the like disposed in the space below the heat source side fan 15. It is shown. The heat source side heat exchanger 10 is arranged along the four side surfaces except for a part of the entire circumference surrounding the four side surfaces, and has a C-shape when viewed from above. The airflow sucked from the suction ports 40a to 40d on the side surface of the casing 40 by the heat source side fan 15 and flowing toward the top surface outlet 40e passes through the heat source side heat exchanger 10. The bottom frame 42 is in contact with the lower end portion of the heat source side heat exchanger 10 and functions as a drain pan that receives drain water generated in the heat source side heat exchanger 10 during cooling operation.

(4) Configuration of Heat Source Side Heat Exchanger 10 FIG. 4 shows a state in which the heat source side heat exchanger 10 is viewed obliquely from above. The heat source side heat exchanger 10 includes a first header collecting pipe 110, a second header collecting pipe 120, a leeward row heat exchanging unit 130, an upwind row heat exchanging unit 140, a connection header 200, and a gas assembly. It has a tube 160 and a refrigerant flow divider 170. In the heat source side heat exchanger 10, the first header collecting pipe 110, the second header collecting pipe 120, the heat exchange units 130 and 140, the connection header 200, the gas collecting pipe 160, and the refrigerant flow divider 170 are all made of an aluminum alloy. It is formed with. When the first header collecting pipe 110, the second header collecting pipe 120, the heat exchanging units 130 and 140, the connection header 200, the gas collecting pipe 160, and the refrigerant distributor 170 are assembled in the heat source side heat exchanger 10, an aluminum alloy is used. It is brazed in a furnace with a brazing material made of steel and joined.

In the heat source side heat exchanger 10 shown in FIG. 4, a thick arrow Ar1 directed from the outside to the inside indicates the flow of air. Moreover, in FIG. 4, the arrow Ar2 of a two-dot chain line has shown the flow of the refrigerant | coolant. The reason why the arrow Ar2 is directed in both directions is that the flow of refrigerant is reversed between the heating operation and the cooling operation. In the cooling operation, the refrigerant returns from the first header collecting pipe 110 through the heat exchange unit 130 in the leeward row at the connection header 200 and passes from the connection header 200 through the heat exchange unit 140 in the upwind row to the second header collection tube. Reach 120. In the heating operation, the refrigerant turns back from the second header collecting pipe 120 through the heat exchange unit 140 in the upwind row at the connection header 200, and passes from the connection header 200 through the heat exchange unit 130 in the downwind row to the first header collection tube. 110 is reached.

(4-1) Heat exchange units 130 and 140
The leeward row heat exchanging section 130 includes a plurality of leeward row flat tubes 63 shown in FIG. 5 and a plurality of leeward row heat transfer fins 65. Also in FIG. 5, the arrow Ar <b> 1 indicates the air flow. The upwind row heat exchanging section 140 includes a plurality of upwind flat tubes 64 shown in FIG. 5 and a plurality of upwind row heat transfer fins 66.

The flat tubes 63 and 64 are flat multi-hole tubes having upper surface portions 63a and 64a and lower surface portions 63b and 64b facing in the vertical direction, and a large number of small passages 63c and 64c through which a refrigerant formed inside flows. The flat tubes 63 are arranged in a plurality of stages in the up-down direction in the leeward row, and the flat tubes 64 are arranged in a plurality of steps in the up-down direction in the upwind row. One end of the flat tube 63 in the leeward row is connected to the first header collecting pipe 110, and the other end is connected to the connection header 200. One end of the flat tube 64 in the windward row is connected to the second header collecting tube 120, and the other end is connected to the connection header 200. Each heat transfer fin 65, 66 extends in the direction along the air flowing between the flat tubes 63, 64 in the adjacent stage and in the vertical direction in order to increase the heat transfer area in the heat exchange of the refrigerant. In the heat transfer fins 65 and 66, a plurality of notches 65a and 66a are formed corresponding to the respective stages of the flat tubes 63 and 64. Each notch 65a, 66a is elongated in a direction perpendicular to the up-down direction. The circumferences of the notches 65a and 66a are in close contact with and joined to the upper surface portions 63a and 64a and the lower surface portions 63b and 64b that serve as heat transfer surfaces.

(4-2) First header collecting pipe 110 and gas collecting pipe 160
(4-2-1) Outline of Configuration FIG. 6 shows a state where the first header collecting pipe 110 and the gas collecting pipe 160 are disassembled. The first header collecting pipe 110 is an elongated hollow cylindrical part whose upper end and lower end are closed. The first header collecting pipe 110 is erected on one end side of the heat exchange section 130 in the leeward row. The first header collecting pipe 110 includes a multi-hole pipe side member 111, a partition member 112, a pipe side member 113, and a partition plate 114. The elongated multi-hole pipe side member 111, the partition member 112, and the pipe side member 113 sandwich the partition member 112 between the multi-hole pipe side member 111 and the pipe side member 113 so that the respective longitudinal directions coincide with the vertical direction. By being combined and integrated, the first header collecting pipe 110 extending in the vertical direction in the heat source side heat exchanger 10 is formed. Two partition plates 114 close the top and bottom of the first header collecting pipe 110. The multi-hole pipe side member 111, the partition member 112, the pipe side member 113, and the partition plate 114 are joined together and integrated in the furnace by, for example, a brazing material.

The cross-section of the multi-hole tube side member 111 cut along a plane perpendicular to the vertical direction is arcuate, and the multi-hole tube side member 111 has flat openings in which a plurality of flat tubes 63 arranged in a step direction are inserted. The number of stages of the pipes 63 is formed. In the center of the partition member 112, a bar-shaped stopper for positioning one end of the plurality of flat tubes 63 extends vertically. On both sides of the stopper of the partition member 112, openings for allowing the coolant to flow from the multi-hole tube side member 111 toward the pipe side member 113 are formed. A cross section obtained by cutting the pipe side member 113 along a plane perpendicular to the vertical direction is an arc shape, and a plurality of openings 115 into which a plurality of connection pipes 161 arranged in the vertical direction are inserted are formed in the pipe side member 113. Yes.

The gas collecting pipe 160 is a bottomed cylindrical straight pipe, and a plurality of openings 167 (see FIG. 10A) to which the plurality of connecting pipes 161 are connected are formed on the side surface. The gas collecting pipe 160 and the first header collecting pipe 110 are bound by a binding band 162 made of an aluminum alloy. An inverted U-shaped pipe 180 made of an aluminum alloy is connected to the upper part of the gas collecting pipe 160. The inverted U-shaped pipe 180 is a part of the refrigerant pipe 19.

The heat source side heat exchanger 10 communicates from the plurality of flat tubes 63 in the leeward row to the inverted U-shaped pipe 180 through the first header collecting pipe 110, the plurality of connecting pipes 161, and the gas collecting pipe 160.

(4-2-2) Positional Relationship In FIG. 7, the first header collecting pipe 110 and the gas collecting pipe 160 are shown so that their centroids 119 and 169 overlap with each other when viewed from above. In the present disclosure, the centroid refers to the center of a planar figure. When the first header collecting pipe 110 is viewed from above, a uniform plate material having the same thickness as the shape surrounded by the outer periphery of the first header collecting pipe 110 is considered, and the center of gravity of the uniform plate material coincides with the centroid. Here, since the gas collecting pipe 160 is a circular pipe, the centroid 169 of the circular gas collecting pipe 160 as viewed from above coincides with the center point of the outer circumferential circle of the gas collecting pipe 160. The centroid 119 of the first header collecting pipe 110 is flat in the direction in which the plurality of leeward flat tubes 63 extend from the first header collecting pipe 110 when viewed in the longitudinal direction of the first header collecting pipe 110 (in plan view). It is located on a virtual straight line L1 obtained by virtually extending the center line of the pipe 63. Here, the longitudinal direction of the first header collecting pipe 110 coincides with the vertical direction.

The outer diameter D1 of the gas collecting pipe 160 is larger than the width W1 of the first header collecting pipe 110. Further, the inner diameter D2 of the gas collecting pipe 160 is larger than the width W1. The width W 1 of the first header collecting pipe 110 is a width in a direction perpendicular to the direction in which the flat pipe 63 extends from the first header collecting pipe 110. As shown in FIG. 7, since the first header collecting pipe 110 is accommodated in the inner periphery of the gas collecting pipe 160, it is apparent that the vertical sectional area of the internal space of the first header collecting pipe 110 with respect to the vertical direction. The vertical sectional area (π × (D2 / 2) ² ) of the internal space of the gas collecting pipe 160 is larger than that.

The vertical cross-sectional area of the internal space of the first header collecting pipe 110 is the area of the portion indicated by hatching in FIG. Since the vertical cross-sectional area of the gas collecting pipe 160 is larger than the vertical cross-sectional area of the first header collecting pipe 110, the pressure of the gas refrigerant can be reduced as compared with the case where the gas collecting pipe 160 is not provided. By providing the gas collecting pipe 160 in this way, the air conditioner 1 can easily satisfy the condition of the pressure of the gas refrigerant required for the air conditioner 1. Here, in order to make the explanation easy to understand, the case where the first header collecting pipe 110 is accommodated in the inner periphery of the gas collecting pipe 160 has been described as an example, but the first header collecting pipe 110 is used as the gas collecting pipe 160. If the relationship of (vertical sectional area of the inner space of the first header collecting pipe 110) <(vertical sectional area of the inner space of the gas collecting pipe 160) is satisfied, the gas collecting pipe 160 is not included. The effect of facilitating the setting of the pressure of the gas refrigerant is provided.

FIG. 8 shows the positional relationship of the flat tubes 63 and 64, the heat transfer fins 65 and 66, the first header collecting pipe 110, the connecting pipe 161, the gas collecting pipe 160, the second header collecting pipe 120, and the like (first view). 1 shows the positional relationship of the header collecting pipe 110 in the longitudinal direction). The centroid 169 of the gas collecting pipe 160 is located on the opposite side of the imaginary straight line L1 from the plurality of flat tubes 64 in the windward row. In order to configure such a positional relationship between the virtual straight line L1 and the gas collecting pipe 160, the connecting pipe 161 that connects the first header collecting pipe 110 and the gas collecting pipe 160 is bent. More specifically, the connection pipe 161 is bent to the opposite side of the plurality of flat tubes 64 with respect to the virtual straight line L1 when viewed in the longitudinal direction of the first header collecting pipe 110. Each of the plurality of connecting pipes 161 extends from the first header collecting pipe 110 along the direction in which the flat pipe 63 extends from the first header collecting pipe 110 (along the virtual straight line L1), and bends in the middle to form a gas collecting pipe. 160 is reached. When the gas collecting pipe 160 is positioned so as to be shifted to the side opposite to the side where the flat pipe 64 exists, the extension line L2 passing through the portion closest to the flat pipe 64 in the first header collecting pipe 110 and parallel to the virtual straight line L1 is flattened. It is preferable to arrange the gas collecting pipe 160 so as not to exceed the pipe 64 side.

(4-2-3) Manufacturing Process of Heat Source Side Heat Exchanger 10 As shown in FIG. 4, the heat source side heat exchanger 10 has bending portions B1, B2, and B3 formed at three locations. Yes. In other words, the flat tubes 63 and 64 have bent portions B1 to B3 that are bent in the same direction when viewed in the vertical direction. Since the size of the furnace for brazing is determined, in order to braze as many of the heat source side heat exchanger 10 as possible in the furnace, the heat exchanging parts 130 and 140 are flat, in other words, the bent parts B1 and B2. , B3 is brazed before forming B3. 9A and 9B show a state where the bent portion B3 is formed in the heat source side heat exchanger 10 before the bent portions B1 to B3 are formed as viewed from above. In the state where brazing in the furnace is finished, as shown in FIG. 9A, the other ends of the flat tubes 63 and 64 of the heat exchange units 130 and 140 in a flat state are fixed together by the connection header 200. Further, before the bent portions B1 to B3 are formed, the second header collecting pipe 120 protrudes to the outside (the farther from the connecting header 200) than the first header collecting pipe 110 and the gas collecting pipe 160. When the second header collecting pipe 120, the first header collecting pipe 110, and the gas collecting pipe 160 are arranged as shown in FIG. 9A before bending, the flat pipes 63 and 64 of the flat pipes 63 and 64 are formed when the bending process is completed. The ends can be arranged so as not to be too far away from each other.

In order to form the bent portion B3 of the heat source side heat exchanger 10, for example, a roll jig 410 and a pressing jig 420 shown in FIGS. 9A and 9B are used. As shown in FIG. 9A, the roll jig 410 is fixed to the side close to the connection header 200 of the heat source side heat exchanger 10 by hitting the place where the bent portion B3 is to be formed. Then, the pressing jig 420 is pressed against the heat exchanging unit 140 from the side opposite to the roll part 411 of the roll jig 410. At that time, the pressing jig 420 presses to the side farther from the connection header 200 than the roll portion 411.

Next, as shown in FIG. 9B, a force is applied from the pressing jig 420 to the heat exchange units 130 and 140 to bend the flat tubes 63 and 64 of the heat exchange units 130 and 140. The curvature radius of the flat tube 64 is larger than the curvature radius of the flat tube 63 at the place where the bent portion B3 is formed. For this reason, the second header collecting pipe 120 approaches the gas collecting pipe 160 after forming the bent portion B3. Further, when the bent part B2 and the bent part B1 are formed, the gas collecting pipe 160 protrudes outside the second header collecting pipe 120 as shown in FIG.

When the bent portions B1 to B3 are formed by the bending process described with reference to FIGS. 9A and 9B, the positional relationship between the second header collecting pipe 120, the first header collecting pipe 110, and the gas collecting pipe 160 changes. In order to prevent a problem due to interference between the gas collecting pipe 160 and the second header collecting pipe 120 when the positional relationship changes, the bent collecting pipe 161 causes the gas collecting pipe 160 to be connected to the second header collecting pipe 120. Is mounted at a position shifted to the opposite side.

10A and 10B show brazing of the inverted U-shaped pipe 180 performed after the formation of the bent portions B1 to B3. The gas collecting pipe 160 includes a bottomed cylindrical main body 165 and an upper pipe expanding portion 166. The expanded pipe portion 166 has a larger inner diameter than the main body portion 165. The inner diameter of the expanded portion 166 is slightly larger than the outer diameter of the inverted U-shaped pipe 180. Therefore, the inverted U-shaped pipe 180 can be inserted into the expanded portion 166. For example, the operator can manually braze the inverted U-shaped pipe 180 to the expanded portion 166.

(4-2-4) Assembly of the first header collecting pipe 110, the connecting pipe 161, and the gas collecting pipe 160 Before the brazing in the furnace, the first header collecting pipe 110, the connecting pipe 161, and the gas collecting pipe 160 are assembled. Done. The 16 connection pipes 161 shown in FIG. 11 are aligned, and one end 610 of the connection pipe 161 has 16 openings formed in the pipe side member 113 of the first header collecting pipe 110. 115. If the direction of the connection pipe 161 inserted into the pipe side member 113 is various, the position of the other end 620 of the connection pipe 161 will not be aligned. If the position of the other end 620 of the connecting pipe 161 is not aligned, the other end 620 is inserted into all of the 16 openings 167 (see FIG. 10A) of the gas collecting pipe 160 aligned in a straight line. It becomes impossible to do. Therefore, as shown in FIG. 12A, the opening 115 is formed so as to be elliptical when viewed from the gas collecting pipe 160 side so that the connecting pipe 161 inserted into the opening 115 bends in the same direction. Yes. The major axis direction of the elliptical shape of the opening 115 coincides with the longitudinal direction of the first header collecting pipe 110. As shown in FIG. 12B, the pipe side member 113 has a semicircular shape when viewed from above. When the side surface of the pipe-side member 113 facing in the direction of air flow is viewed, it has the shape shown in FIG. 12C, and the opening 115 is hollowed and recessed.

Each connecting pipe 161 has an elliptical shape with one end 610 shown in FIG. 13A shown in FIG. 13C. The bending direction of the bent portion 630 of each connecting pipe 161 coincides with the elliptical short axis direction of the end portion 610 (the direction of the arrow Ar3 in FIG. 13C). The major axis direction of the elliptical shape of the end portion 610 coincides with the longitudinal direction (vertical direction) of the first header collecting pipe 110. On the other hand, the other end 620 of each connecting pipe 161 is circular. Tapers 611 and 621 are attached to one end 610 and the other end 620 of each connecting pipe 161. The opening 167 of the gas collecting pipe 160 is tapered (not shown) in accordance with the taper 621. These tapers 611 and 621 and the like facilitate attachment of the connecting pipe 161 to the pipe side member 113 and the gas collecting pipe 160.

(4-3) Second header collecting pipe 120
FIG. 14 shows a state in which the second header collecting pipe 120 is disassembled. FIG. 15 is an enlarged view of a part of the second header collecting pipe 120 shown in FIG. FIG. 16 is an enlarged view of a part of the partition member 122 to which the partition plate 124 and the rectifying plate 125 are attached. FIG. 17 shows a state where the assembled second header collecting pipe 120 is viewed from above. Further, FIG. 18 shows a cross section relating to a part of the structure of the second header collecting pipe 120. The second header collecting pipe 120 is an elongated hollow cylindrical part whose upper end and lower end are closed. The second header collecting pipe 120 is erected on one end side of the heat exchange unit 140 in the windward row. The second header collecting pipe 120 includes a multi-hole pipe side member 121, a partition member 122, a pipe side member 123, a partition plate 124 and a rectifying plate 125. The elongated multi-hole pipe side member 121, the partition member 122, and the pipe side member 123 are such that the partition member 122 is sandwiched between the multi-hole pipe side member 121 and the pipe side member 123, and the respective longitudinal directions coincide with the vertical direction. Are combined and integrated. By being integrated in this way, the multi-hole pipe side member 121, the partition member 122, and the pipe side member 123 form a second header collecting pipe 120 that extends in the vertical direction in the heat source side heat exchanger 10. Two partition plates 124 close the upper and lower sides of the second header collecting pipe 120. The multi-hole pipe side member 121, the partition member 122, the pipe side member 123, the partition plate 124, and the rectifying plate 125 are joined together and integrated in the furnace by, for example, a brazing material.

The interior of the second header collecting pipe 120 is partitioned by a plurality of partition plates 124 and divided into a plurality of spaces. As shown in FIG. 18, the space SP <b> 1 formed between the two partition plates 124 communicates with a plurality of flat tubes 64 and at least one capillary tube 190. The rectifying plate 125 is disposed near the upper portion of the capillary tube 190. The partition member 122 is formed with an opening 122 a near the lower partition plate 124, an opening 122 b near the upper partition plate 124, and an opening 122 c near the rectifying plate 125. . The rectifying plate 125 is formed with a rising opening 125a. The refrigerant that reaches between the partition member 122 and the multi-hole tube side member 121 through the opening 122a from the capillary tube 190 is blown upward by the small ascending opening 125a. Thereafter, the refrigerant forms a loop-like flow (flow indicated by a thick arrow Ar4 in FIG. 18) that passes through the opening 122c next to the opening 122b. The refrigerant flows separately from the loop flow into the passage 64c of the multi-stage flat tube 64 between the rectifying plate 125 and the upper partition plate 124.

(4-4) Connection header 200
FIG. 19 shows a state in which the connection header 200 is viewed obliquely from above. In FIG. 20, the upper part of the connection header 200 is shown enlarged. 21 shows a cross-sectional shape cut along line II in FIG. 20, and FIG. 22 shows a cross-sectional shape cut along line II-II in FIG. The connection header 200 is an elongated hollow cylindrical part whose upper end and lower end are closed. The connection header 200 is erected on the other end side of the heat exchange unit 130 in the leeward row and the heat exchange unit 140 in the windward row.

The connection header 200 is configured by joining the first member 210, the second member 220, and the third member 230 together. In the first member 210, two openings 211 and 212 are formed side by side in a direction orthogonal to the vertical direction. The openings 211 and 212 are provided to correspond to the other end of the flat tubes 63 in the plural lee rows and the other end of the flat tubes 64 in the plural lee rows, respectively.

The second member 220 has a flat sealing wall 241 extending in the vertical direction and a partition wall 242 extending in a direction intersecting the sealing wall 241. Openings 211 and 212 are arranged between the partition walls 242 adjacent in the vertical direction. That is, in the communication space SP2 surrounded by the partition wall 242, the first member 210, and the sealing wall 241 adjacent in the vertical direction, the passage 63c of one flat tube 63 in the leeward row and one wind The passage 64c of the upper row of flat tubes 64 is in communication. Accordingly, during the cooling operation, the refrigerant that has entered the communication space SP2 through the passage 63c of the flat tube 63 in one leeward row is folded back in the communication space SP2 and is supplied to the one wind arranged in the adjacent row. It flows into the passage 64c of the upper row of flat tubes 64. In the heating operation, contrary to the cooling operation, the refrigerant that has entered the communication space SP2 through the passage 64c of the flat tube 64 in one upwind row is folded back in the communication space SP2 and arranged in the adjacent row. It flows into the passage 63c of the flat tube 63 in one leeward row. The third member 230 is a member that is formed outside the second member 220 and suppresses the corrosion of the second member 220.

(5) Features (5-1)
In the air conditioner 1 of the above embodiment, one end of the flat tube 63 in the leeward row that is the first flat tube is connected to the first header collecting tube 110 that is the first gas collecting member. On the other hand, the second header collecting pipe 120 which is a liquid collecting member is connected to one end of the flat pipe 64 in the windward row which is the second flat pipe. The gas collecting pipe 160 connected to the first header collecting pipe 110 by the connecting pipe 161 is a second gas collecting member. The heat transfer fins 65 that are first heat transfer fins are attached to the flat tube 63 that is the first flat tube. Moreover, what is attached to the flat tube 64 which is a 2nd flat tube is the heat transfer fin 66 which is a 2nd heat transfer fin.

Since the centroid 169 of the gas collecting pipe 160 is located on the opposite side of the flat pipe 64 with respect to the virtual straight line L1 passing through the center of the flat pipe 63, the manufacturing process of the heat source side heat exchanger 10, for example, a plurality of flat pipes When bending 63, 64, the heat transfer fins 65, 66 can be brought close to the limit where members around the end of the flat tube 64, such as the second header collection tube 120, do not interfere with the gas collection tube 160, thereby reducing the distance. By reducing the distance between the heat transfer fins 65, 66, it becomes easier to obtain good heat exchange performance than when the distance is large, and the air conditioner 1 that is a refrigeration apparatus with good heat exchange performance can be easily obtained. Can be provided.

(5-2)
In the above embodiment, the vertical sectional area of the internal space of the gas collecting pipe 160 that is the second gas collecting member is made larger than the vertical sectional area of the internal space of the first header collecting pipe 110 that is the first gas collecting member. Therefore, the pressure loss of the refrigerant is reduced. As a result, for example, the heat exchange performance of the air conditioner 1 can be improved as compared with the case where piping is directly performed from the first header collecting pipe 110 having a smaller vertical cross-sectional area in the internal space than the gas collecting pipe 160.

(5-3)
In the above embodiment, the heat source side heat exchanger 10 of the air conditioner 1 includes the second header collecting pipe 120 that is a liquid collecting member connected to the end of the flat pipe 64. The flat tubes 63 and 64 have bent portions B1 to B3 that are bent in the same direction when viewed in the longitudinal direction of the first header collecting tube 110. As described with reference to FIGS. 9A and 9B, before forming the bent portions B1 to B3, the second header collecting pipe 120 is on the opposite side of the first header collecting pipe 110 with respect to the gas collecting pipe 160. As shown in FIG. 8, after the formation of the bent portions B1 to B3, the second header collecting pipe 120 is bent so as to be positioned on the same side as the first header collecting pipe 110 with respect to the gas collecting pipe 160.

Despite the flat tubes 63 and 64 having the above-described structure, the gas collecting tube 160 for forming the bent portions B1 to B3 even if the distance between the flat tubes 63 and 64 is reduced. Interference with the second header collecting pipe 120, which is a liquid collecting member, can be avoided. As a result, the distance between the heat transfer fins 65 and 66 can be reduced to easily provide the air conditioner 1 with good heat exchange performance.

(5-4)
In the above embodiment, the bent portions B1 to B3 are formed by pressing the roll jig 410 and the pressing jig 420, which are bending members, against the heat transfer fins 65 and 66 and bending the plurality of flat tubes 63 and 64. . At this time, since interference between members around the ends of the gas collecting pipe 160 and the flat pipe 64, such as the second header collecting pipe 120, is suppressed, the curvature at the bent portions B1 to B3 can be increased. Damage to the flat tubes 63 and 64 and the heat transfer fins 65 and 66 can be suppressed as compared with the case of reducing the size. Even when the bending member is pressed against one of the heat transfer fins 65 and 66 to bend the flat tubes 63 and 64, the same effect as described above is obtained.

(5-5)
In the above embodiment, the first header collecting pipe 110 and the gas collecting pipe 160 are connected to each other by reducing the inner diameter of the connecting pipe 161 by communicating the first header collecting pipe 110 and the gas collecting pipe 160 with a plurality of connecting pipes 161. Since the flow passage area for communicating the above is secured, the pressure loss in the connecting pipe 161 can be suppressed and the deterioration of the heat exchange performance can be suppressed.

(5-6)
In the above embodiment, the centroid 169 of the gas collecting pipe 160 can be easily positioned on the opposite side of the flat tube 64 by using the connecting pipe 161 bent to the opposite side of the flat tube 64. .

(5-7)
In the above embodiment, the bending direction of the connecting pipe 161 can be made uniform by inserting the elliptical end 610, so that the assembly in which the first header collecting pipe 110 and the gas collecting pipe 160 are communicated by the connecting pipe 161 is easy. It has become. As a result, the manufacturing cost of the air conditioning apparatus 1 that is a refrigeration apparatus can be reduced.

(5-8)
The connecting pipe 161 of the above embodiment has tapers 611 and 612 at both ends 610 and 620. Therefore, even if the connecting pipe 161 is bent, the connecting pipe 161 can be easily introduced into the openings 115 and 167 which are holes of the first header collecting pipe 110 and the gas collecting pipe 160 by the tapers 611 and 612. As a result, the assembly around the first header collecting pipe 110 and the gas collecting pipe 160 is facilitated, and the cost of the air conditioner 1 that is a refrigeration apparatus can be reduced. Note that the taper may be formed at either one of both ends of the connecting pipe, and in this case as well, assembly around the first header collecting pipe 110 and the gas collecting pipe 160 is performed as compared with the case where no taper is provided. Becomes easier.

(6) Modification (6-1) Modification 1A
In the above embodiment, the bent portion 630 is formed in the connecting pipe 161 in order to position the centroid 169 of the gas collecting pipe 160 on the side opposite to the flat pipe 64 with respect to the virtual straight line L1 passing through the center of the flat pipe 63. The example to do was demonstrated. However, the configuration in which the centroid 169 of the gas collecting pipe 160 is positioned on the opposite side of the flat tube 64 with respect to the virtual straight line L1 is not limited to the configuration of the above embodiment. For example, as shown in FIG. 23, the connecting pipe 161A extends from the first header collecting pipe 110 toward the opposite side of the flat pipe 64 with respect to the virtual straight line L1. Plugged in. In other words, the extension line L3 of the central axis of the connecting pipe 161 is in the direction opposite to the flat pipe 64 with respect to the virtual straight line L1, and the extension line L3 and the virtual straight line L1 intersect at a predetermined angle α. The connecting pipe 161 is inserted into the first header collecting pipe 110. For example, the connecting pipe 161A is connected to the gas collecting pipe 160 so that the centroid 169 of the gas collecting pipe 160 passes over the extension line L3. With this configuration, the centroid 169 of the gas collecting pipe 160 can be easily positioned on the side opposite to the flat pipe 64.

(6-2) Modification 1B
Although the said embodiment demonstrated the case where the heat source side heat exchanger 10 was an aluminum alloy, the heat source side heat exchanger 10 may be formed with metals other than an aluminum alloy, for example, aluminum or copper.

(6-3) Modification 1C
In the above embodiment, the case where the flat tubes 63 that are the first flat tubes are arranged in the leeward row and the flat tubes 64 that are the second flat tubes are arranged in the windward row has been described. The second flat tubes may be arranged in the windward row.

(6-4) Modification 1D
In the above embodiment, the case where the shape of the end portion 610 of the connection pipe 161 that fits only in a predetermined direction with the first header collecting pipe 110 is an ellipse has been described. However, the shape of the end portion 610 of the connection pipe 161 that is fitted only in a predetermined direction is not limited to an ellipse, and may be, for example, an egg shape or an ellipse.

(6-5) Modification 1E
In the above-described embodiment, the case where all the refrigerant flowing through the first header collecting pipe 110 passes through the gas collecting pipe 160 has been described. However, a part of the refrigerant flowing through the first header collecting pipe 110 passes along a route other than the gas collecting pipe 160. You may comprise so that it may flow.

While the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as set forth in the claims. .

1 Air conditioner (example of refrigeration equipment)
10 heat source side heat exchanger 63 flat tube (example of first flat tube)
64 flat tube (example of second flat tube)
65 Heat transfer fin (Example of first heat transfer fin)
66 Heat transfer fin (Example of second heat transfer fin)
110 First header collecting pipe (example of first gas collecting member)
120 Second header collecting pipe (example of liquid collecting member)
161, 161A Connecting pipe 160 Gas collecting pipe (Example of second gas collecting member)
611, 621 Taper B1-B3 Bending part

International Publication No. 2013/161799

Claims (9)

1. A plurality of first flat tubes (63) and a plurality of second flat tubes (64) arranged in two rows in the direction of air flow;
   A plurality of first heat transfer fins (65) and a plurality of second heat transfer fins (66) respectively attached to the plurality of first flat tubes and the plurality of second flat tubes;
   A first gas collecting member (110) to which ends of the plurality of first flat tubes are connected;
   At least one connecting pipe (161, 161A) extending from the first gas collecting member;
   A second gas collecting member (160) communicated with the first gas collecting member by the connecting pipe;
   With
   The second gas collecting member virtually has a center line of the first flat tube in a direction in which the plurality of first flat tubes extend from the first gas collecting member when viewed in the longitudinal direction of the first gas collecting member. The refrigeration apparatus (1), wherein a centroid is located on the opposite side of the plurality of second flat tubes with respect to the extended virtual straight line.
2. The second gas collecting member has a vertical sectional area of the internal space with respect to the longitudinal direction larger than a vertical sectional area of the internal space of the first gas collecting member,
   The refrigeration apparatus (1) according to claim 1.
3. A liquid collecting member (120) to which ends of the plurality of second flat tubes are connected;
   The plurality of first flat tubes and the plurality of second flat tubes have bent portions (B1, B2, B3) that are bent in the same direction when viewed in the longitudinal direction, and before the bent portions are formed, A liquid collecting member is on the opposite side of the first gas collecting member with respect to the second gas collecting member, and the liquid collecting member is formed with the first gas collecting member with respect to the second gas collecting member after forming the bent portion. It is bent so that it is located on the same side,
   The refrigeration apparatus (1) according to claim 1 or claim 2.
4. The bending portion is formed by pressing a bending member against the first heat transfer fin and / or the second heat transfer fin and bending the plurality of first flat tubes and the plurality of second flat tubes. ,
   The refrigeration apparatus (1) according to claim 3.
5. The at least one connecting pipe is a plurality of connecting pipes for communicating the first gas collecting member and the second gas collecting member.
   The refrigeration apparatus (1) according to any one of claims 1 to 4.
6. The connection pipe (161) is bent to the opposite side of the plurality of second flat tubes with respect to the virtual straight line when viewed in the longitudinal direction.
   The refrigeration apparatus according to any one of claims 1 to 5.
7. The connecting pipe has an elliptical shape at one end.
   The refrigeration apparatus according to claim 6.
8. The connecting pipe has a taper (611, 621) attached to at least one of both ends.
   The refrigeration apparatus according to claim 5 or 6.
9. The connecting pipe (161A) extends from the first gas collecting member toward the side opposite to the plurality of second flat pipes with respect to the virtual straight line.
   The refrigeration apparatus according to any one of claims 1 to 8.
   

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