JP2022044306A - Lamination type header, heat exchanger, and freezer - Google Patents

Abstract

To provide a lamination type header which can be formed by using three plates.SOLUTION: A lamination type header includes: a first plate 41; a second plate 42 which is overlapped with the first plate 41 and with which a refrigerant pipe 35 is connected; and a third plate 43 which is overlapped with the first plate 41 at the opposite side of the second plate 42 and with which a first heat transfer pipe 26 and a second heat transfer pipe 26 are connected. A first passage 45 into which a refrigerant flows from the refrigerant pipe 35 is formed between the first plate 41 and the second plate 42. A second passage 46 which enables the refrigerant to flow into the first heat transfer pipe 26 and a third passage 46 which enables the refrigerant to flow into the second heat transfer pipe 26 are formed between the first plate 41 and the third plate 43. The first plate 41 is formed with a first communication port 47 which allows the first passage 45 and the second passage 46 to communicate with each other and a second communication port 47 which allows the first passage 45 and the third passage 46 to communicate with each other. The first plate 41 has a first recessed part 51 forming the first passage 45 on a plate surface facing the second plate 42.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to laminated headers, heat exchangers, and refrigeration equipment applicable to heat exchangers.

The following Patent Document 1 discloses a laminated header configured by laminating a plurality of plate-shaped members. In this laminated header, a first plate-shaped member having a plurality of first outlet flow paths to which a flat pipe (heat transfer tube) is connected and one first inlet flow path to which a refrigerant pipe is connected are formed. A distribution flow path is arranged between the second plate-shaped member and the first plate-shaped member and the second plate-shaped member, and distributes the refrigerant flowing in from the first inlet flow path to a plurality of first outlet flow paths. It includes a plurality of formed third plate-shaped members.

Each third plate-shaped member is formed with a branch flow path for branching the inflowing refrigerant into two. The refrigerant flowing in from the first inlet flow path of the second plate-shaped member passes through the branch flow paths of the plurality of third plate-shaped members, so that two, four, eight, and so on. The number of branches increases with exponentiation, and finally the number of branches is the same as that of the first outlet flow path.

International Publication No. 2014/185391

The laminated header described in Patent Document 1 requires a larger number of third plate-shaped members as the number of first outlet flow paths in the first plate-shaped member increases. Therefore, the number of parts of the laminated header increases, and the process of joining the plate-shaped members to each other increases, which may increase the manufacturing cost.
It is an object of the present disclosure to provide a laminated header, a heat exchanger, and a refrigerating apparatus that can be configured with three plates.

(1) The laminated header of the present disclosure is
1st plate and
A second plate that is overlapped with the first plate and to which a refrigerant pipe is connected in a first direction perpendicular to the plate surface of the first plate, and
A third plate that is overlapped with the first plate and to which the first heat transfer tube and the second heat transfer tube are connected is provided on the side opposite to the second plate in the first direction.
A first flow path through which the refrigerant flows from the refrigerant pipe is formed between the first plate and the second plate.
A second flow path for allowing the refrigerant to flow into the first heat transfer tube and a third flow path for allowing the refrigerant to flow into the second heat transfer tube are formed between the first plate and the third plate.
The first plate is formed with a first communication port that communicates the first flow path and the second flow path, and a second communication port that communicates the first flow path and the third flow path. Being done
The first plate has a first recess forming the first flow path on a plate surface facing the second plate.

With the above configuration, a laminated header can be configured using three plates. Since the first plate has the first recess, the first flow path can be easily formed between the first plate and the second plate.

(2) Preferably, the second plate has an opening penetrating in the first direction, and the plate surface facing the first plate excluding the opening is a flat surface.
With this configuration, the structure of the second plate can be simplified.

(3) Preferably, the first plate has a second recess forming the second flow path and a third recess forming the third flow path on the plate surface facing the third plate. ..
With such a configuration, a second flow path can be easily formed between the first plate and the third plate. Since the first plate has the first recess to the third recess, the structures of the second plate and the third plate can be simplified.

(4) The laminated header of the present disclosure is
1st plate and
A second plate that is overlapped with the first plate and to which a refrigerant pipe is connected in a first direction perpendicular to the plate surface of the first plate, and
A third plate that is overlapped with the first plate and to which the first heat transfer tube and the second heat transfer tube are connected is provided on the side opposite to the second plate in the first direction.
A first flow path through which the refrigerant flows from the refrigerant pipe is formed between the first plate and the second plate.
A second flow path for allowing the refrigerant to flow into the first heat transfer tube and a third flow path for allowing the refrigerant to flow into the second heat transfer tube are formed between the first plate and the third plate.
The first plate is formed with a first communication port that communicates the first flow path and the second flow path, and a second communication port that communicates the first flow path and the third flow path. Being done
The first plate has a second recess forming the second flow path and a third recess forming the third flow path on the plate surface facing the third plate.

With the above configuration, a laminated header can be configured using three plates. Since the first plate has the second recess and the third recess, the second flow path and the third flow path can be easily formed between the first plate and the third plate.

(5) Preferably, the third plate has an opening penetrating in the first direction, and the plate surface facing the first plate excluding the opening is a flat surface.
With this configuration, the structure of the third plate can be simplified.

(6) Preferably, the first heat transfer tube and the second heat transfer tube are multi-hole tubes having a plurality of refrigerant flow paths inside.
The third plate has a first opening and a second opening to which the first heat transfer tube and the second heat transfer tube are connected, respectively.
The first communication port is arranged at a position that does not overlap with the first opening when viewed from the first direction, and the second communication port is arranged at a position that does not overlap with the second opening when viewed from the first direction. There is.
With such a configuration, the refrigerant flowing into the second flow path and the third flow path from the first communication port and the second communication port, respectively, is a multi-hole pipe, and the refrigerant flows of the first heat transfer tube and the second heat transfer tube, respectively. It is possible to suppress the drift of the refrigerant into each refrigerant flow path when it flows into the path.

(7) Preferably, the first flow path is formed in an annular shape and has an annular portion for circulating the refrigerant.
With such a configuration, the refrigerant can be uniformly divided at the first communication port and the second communication port while circulating the refrigerant in the first flow path.

(8) Preferably, the length of the first plate, the second plate, and the third plate in the second direction orthogonal to the first direction is orthogonal to the first direction and the second direction. Greater than the length in the third direction,
On both sides of the third plate in the third direction, there are covering members that project from the third plate toward the first plate side and cover the end faces of the first plate and the second plate in the third direction. is doing.
With such a configuration, the relative positions of the first plate, the second plate, and the third plate in the third direction can be appropriately set.

(9) The heat exchanger of the present disclosure includes the laminated header according to any one of (1) to (8) above.

(10) The refrigerating apparatus of the present disclosure includes the heat exchanger described in (9) above.

It is a schematic block diagram of the refrigerating apparatus to which the heat exchanger provided with the laminated header which concerns on one Embodiment of this disclosure is applied. It is a schematic diagram which shows unfolding an outdoor heat exchanger. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a side view which shows the lower side of the liquid header of an outdoor heat exchanger. It is an exploded perspective view of the liquid header of an outdoor heat exchanger. It is an exploded perspective view of the liquid header of an outdoor heat exchanger. FIG. 4 is a cross-sectional view taken along the line BB of FIG. FIG. 7 is a cross-sectional view taken along the line CC of FIG. It is a front view of the flow path formation plate of a liquid header. It is a rear view of the flow path formation plate of a liquid header. FIG. 7 is an enlarged view of part D in FIG. 7. FIG. 7 is an enlarged view of part E in FIG. 7.

FIG. 1 is a schematic configuration diagram of a refrigerating apparatus to which a heat exchanger provided with a laminated header according to an embodiment of the present disclosure is applied.
The refrigerating device of the present embodiment is an air conditioner 1. The air conditioner 1 cools and heats the room, for example. The air conditioner 1 includes an outdoor unit 2 installed outdoors and an indoor unit 3 installed indoors. The outdoor unit 2 and the indoor unit 3 are connected to each other by a connecting pipe which is a refrigerant pipe.

The air conditioner 1 includes a refrigerant circuit 4 that performs a steam compression type refrigeration cycle operation. The refrigerant circuit 4 includes an indoor heat exchanger 11, a compressor 12, an oil separator 13, an outdoor heat exchanger 14, an expansion valve (expansion mechanism) 15, an accumulator 16, a four-way switching valve 17, and the like, and a refrigerant pipe connecting them. Has 10 and. The refrigerant pipe 10 includes a liquid pipe 10L and a gas pipe 10G.

The indoor unit 3 is provided with an indoor heat exchanger 11 among the components of the refrigerant circuit 4. The outdoor unit 2 is provided with a compressor 12, an oil separator 13, an outdoor heat exchanger 14, an expansion valve 15, an accumulator 16, and a four-way switching valve 17 among the components of the refrigerant circuit 4.

When the air conditioner 1 performs cooling operation, the four-way switching valve 17 is switched to the state shown by the solid line in FIG. 1, the outdoor heat exchanger 14 functions as a refrigerant condenser (radiator), and the indoor heat exchanger 11 Functions as a refrigerant evaporator. The gaseous refrigerant discharged from the compressor 12 passes through the oil separator 13 and flows into the outdoor heat exchanger 14. The oil separator 13 separates the refrigerating machine oil contained in the gaseous refrigerant from the gaseous refrigerant. The gaseous refrigerant exchanges heat with the outside air in the outdoor heat exchanger 14 and condenses to become a liquid refrigerant. After that, the liquid refrigerant is depressurized by the expansion valve 15, exchanges heat with the indoor air in the indoor heat exchanger 11, evaporates, and is sucked into the compressor 12 via the accumulator 16. The accumulator 16 separates the gaseous refrigerant and the liquid refrigerant, and causes the compressor 12 to suck only the gaseous refrigerant.

In the case of performing the defrosting operation for removing the frost adhering to the outdoor heat exchanger 14 during the heating operation, the outdoor heat exchanger 14 functions as a refrigerant condenser as in the cooling operation, and the indoor heat exchanger 11 Functions as a refrigerant evaporator.

When the air conditioner 1 performs heating operation, the four-way switching valve 17 is switched to the state shown by the broken line in FIG. 1, the outdoor heat exchanger 14 functions as a refrigerant evaporator, and the indoor heat exchanger 11 condenses the refrigerant. Functions as a vessel. The gaseous refrigerant discharged from the compressor 12 passes through the oil separator 13 and flows into the indoor heat exchanger 11. The gaseous refrigerant exchanges heat with the indoor air in the indoor heat exchanger 11 and condenses to become a liquid refrigerant. After that, the liquid refrigerant is depressurized by the expansion valve 15, exchanges heat with the outside air by the outdoor heat exchanger 14, evaporates, and is sucked into the compressor 12 via the accumulator 16.

[Structure of outdoor heat exchanger 14]
FIG. 2 is a schematic view showing the outdoor heat exchanger 14 in an expanded manner. FIG. 3 is a cross-sectional view taken along the line AA of FIG.
The outdoor heat exchanger 14 exchanges heat between the refrigerant flowing inside and the air. The outdoor heat exchanger 14 of the present embodiment is a microchannel type heat exchanger. The outdoor heat exchanger 14 has a pair of headers 21 and 22 and a heat exchanger main body 23. The pair of headers 21 and 22 and the heat exchanger body 23 are made of aluminum or an aluminum alloy.

The pair of headers 21 and 22 are arranged at both ends of the heat exchanger main body 23. One header 21 is a liquid header through which a liquid refrigerant (gas-liquid two-phase refrigerant) flows. The other header 22 is a gas header through which a gaseous refrigerant flows. The liquid header 21 and the gas header 22 are arranged with their longitudinal directions facing up and down. A shunt 19 having a plurality of capillary pipes 37 is connected to the liquid header 21. A gas pipe 24 is connected to the gas header 22.

The heat exchanger main body 23 is a portion that exchanges heat between the refrigerant flowing inside and the air. The air flows in the direction indicated by the arrow a in FIG. The heat exchanger main body 23 has a plurality of heat transfer tubes 26 and a plurality of fins 27. The plurality of heat transfer tubes 26 are arranged horizontally. The plurality of heat transfer tubes 26 are arranged side by side in the vertical direction. One end of each heat transfer tube 26 in the longitudinal direction is connected to the liquid header 21. The other end of each heat transfer tube 26 in the longitudinal direction is connected to the gas header 22.

The heat transfer tube 26 of the present embodiment is a multi-hole tube in which a plurality of holes 26p serving as a refrigerant flow path are formed. Each hole 26p extends along the longitudinal direction of the heat transfer tube 26. The refrigerant exchanges heat with air while flowing through each hole 26p of the heat transfer tube 26. The plurality of holes 26p are arranged side by side in a horizontal direction orthogonal to the longitudinal direction of the heat transfer tube 26. The plurality of holes 26p are arranged side by side along the air flow direction a with respect to the heat exchanger main body 23. Air passes between the plurality of heat transfer tubes 26 in the vertical direction. The heat transfer tube 26 is formed in a flat shape in which the length in the vertical direction is smaller than the length in the air flow direction a.

The plurality of fins 27 are arranged side by side along the longitudinal direction of the heat transfer tube 26. Each fin 27 is a thin plate material formed long in the vertical direction. The fin 27 is formed with a plurality of notches 27a extending from one side of the air flow direction a toward the other side side by side at intervals in the vertical direction. The heat transfer tube 26 is attached to the fin 27 in a state of being inserted into each notch 27a of the fin 27.

When the cooling operation is performed, the refrigerant passes from the gas header 22 through the heat exchanger main body 23 and flows in one direction to the liquid header 21. When the heating operation is performed, the refrigerant passes from the liquid header 21 through the heat exchanger main body 23 and flows in one direction to the gas header 22.

The heat exchanger main body 23 illustrated in FIG. 2 has a plurality of (five in the illustrated example) heat exchange units 31. The plurality of heat exchange units 31 are arranged side by side in the vertical direction. The inside of the liquid header 21 is divided into upper and lower parts for each heat exchange unit 31. In other words, as shown in FIG. 3, a flow path 33 for each heat exchange unit 31 is formed inside the liquid header 21.

A plurality of (five in the illustrated example) connecting pipes 35, which are refrigerant pipes, are connected to the liquid header 21. The connecting pipe 35 is provided corresponding to each flow path 33. The capillary pipe 37 of the shunt 19 is connected to each connecting pipe 35.

The inside of the gas header 22 is not partitioned and has a continuous flow path across all the heat exchange portions 31. Therefore, the refrigerant flowing into the gas header 22 from one gas pipe 24 is diverted to all the heat transfer pipes 26, and the refrigerant flowing into the gas header 22 from all the heat transfer pipes 26 is merged by the gas header 22 to be one gas. It flows into the pipe 24.

During the heating operation, the liquid refrigerant separated by the shunt 19 flows through the capillary pipe 37 and the connecting pipe 35, flows into each flow path 33 in the liquid header 21, and is connected to each of the plurality of flow paths 33. It flows to the gas header 22 through the heat transfer tube 26. On the contrary, during the cooling operation or the defrosting operation, the refrigerant separated into the plurality of heat transfer tubes 26 by the gas header 22 flows into the flow paths 33 of the liquid header 21, and the capillary pipes 37 are connected from the flow paths 33. It flows and joins with the shunt 19.

[Specific configuration of liquid header 21]
Hereinafter, a specific configuration of the liquid header 21 will be described.
FIG. 4 is a side view showing the lower side of the liquid header 21 of the outdoor heat exchanger 14. 5 and 6 are exploded perspective views of the liquid header 21 of the outdoor heat exchanger 14. FIG. 7 is a cross-sectional view taken along the line BB of FIG. FIG. 8 is a cross-sectional view taken along the line CC of FIG.

As shown in FIGS. 4 to 8, the liquid header 21 is a laminated header formed by stacking a plurality of plates 41, 42, 43. Specifically, the liquid header 21 of the present embodiment is configured by stacking three plates 41, 42, 43. The liquid header 21 is between the connection pipe mounting plate 42 to which the connection pipe 35, which is a refrigerant pipe, is attached, the heat transfer pipe mounting plate 43 to which the heat transfer pipe 26 is attached, and the connection pipe mounting plate 42 and the heat transfer pipe mounting plate 43. It has a flow path forming plate 41 to be arranged. All of these plates 41, 42, 43 are made of aluminum or an aluminum alloy.

In the following description, the direction in which the plurality of plates 41, 42, 43 are stacked, in other words, the direction perpendicular to the plate surface of each plate 41, 42, 43 is defined as the first direction X, and is orthogonal to the first direction X. The longitudinal direction of the liquid header 21 is defined as the second direction Z, and the direction orthogonal to the first direction X and the second direction Z is defined as the third direction Y. The liquid header 21 of the present embodiment is arranged with the first direction X facing the front-rear direction, the second direction Z facing the vertical direction, and the third direction Y facing the left-right direction. Therefore, in the following description, the first direction X may be paraphrased as the front-rear direction, the second direction Z as the vertical direction, and the third direction Y as the left-right direction. In the first direction X, the connection tube mounting plate 42 side may be referred to as the front surface, and the heat transfer tube mounting plate 43 side may be referred to as the back surface.

(Connecting tube mounting plate 42)
As shown in FIGS. 5 and 6, the connecting pipe mounting plate 42 is a rectangular plate material long in the vertical direction Z. The plate surface of the connecting pipe mounting plate 42 is arranged along the vertical direction Z and the horizontal direction Y.

The connection pipe mounting plate 42 has a plurality of openings 42a penetrating in the front-rear direction X. The plurality of openings 42a are formed side by side in the second direction Z. The opening 42a of the connection pipe mounting plate 42 is arranged at a position biased to one side of the connection pipe mounting plate 42 in the left-right direction Y. The openings 42a adjacent to the vertical direction Z are arranged at intervals corresponding to the length of one heat exchange unit 31 in the heat exchanger main body 23 in the vertical direction Z.

A connecting pipe 35 is attached to each opening 42a. Specifically, the end portion of the connecting pipe 35 is inserted into each opening 42a and joined by brazing.
In the connection pipe mounting plate 42, one plate surface facing the flow path forming plate 41 and the other plate surface on the opposite side are formed on a flat surface except for the opening 42a.

(Heat transfer tube mounting plate 43)
As shown in FIGS. 5 and 6, the heat transfer tube mounting plate 43 is made of a rectangular plate material long in the vertical direction Z. The length of the heat transfer tube mounting plate 43 in the vertical direction Z and the length in the horizontal direction Y are substantially the same as the length in the vertical direction Z and the length in the horizontal direction Y of the connecting pipe mounting plate 42.

A plurality of openings 43a are formed in the heat transfer tube mounting plate 43 so as to penetrate in the front-rear direction X. The plurality of openings 43a are formed side by side in the vertical direction Z. The opening 43a is a hole formed longitudinally in the left-right direction Y. As shown in FIGS. 7 and 8, one end of the heat transfer tube 26 is inserted into each opening 43a. The inner peripheral portion of the opening 43a and the outer peripheral surface of the heat transfer tube 26 are joined by brazing.

In the heat transfer tube mounting plate 43, one plate surface facing the flow path forming plate 41 and the other plate surface on the opposite side are formed on a flat surface except for the opening 43a.

As shown in FIGS. 5 to 7, the liquid header 21 has a pair of covering members 44 on both sides of the heat transfer tube mounting plate 43 in the left-right direction Y. The pair of covering members 44 project from the heat transfer tube mounting plate 43 toward the flow path forming plate 41 and the connecting tube mounting plate 42 in the front-rear direction X. The pair of covering members 44 are formed by bending both sides of the heat transfer tube mounting plate 43 in the left-right direction Y.

The pair of covering members 44 sandwich the connection pipe mounting plate 42 and the flow path forming plate 41 from the outside in the left-right direction Y, and set the positions of the connection pipe mounting plate 42 and the flow path forming plate 41 in the left-right direction Y. Therefore, the relative positions of the connection tube mounting plate 42, the heat transfer tube mounting plate 43, and the flow path forming plate 41 in the left-right direction Y are appropriately set by the pair of covering members 44.

(Flow path forming plate 41)
As shown in FIGS. 5 to 7, the flow path forming plate 41 is a rectangular plate material long in the vertical direction Z. The length of the flow path forming plate 41 in the vertical direction Z and the length in the horizontal direction Y are substantially the same as the length in the vertical direction Z and the length in the horizontal direction Y of the connecting pipe mounting plate 42. The flow path forming plate 41 is arranged along the vertical direction Z and the horizontal direction Y.

A plurality of flow paths 33 described with reference to FIG. 3 are formed on the flow path forming plate 41. In the following description of the flow path 33, the “inflow side” and the “outflow side” mean the side on which the refrigerant flows into the liquid header 21 and the side on which the refrigerant flows out during the heating operation.

FIG. 9 is a front view of the flow path forming plate 41 of the liquid header 21. FIG. 10 is a rear view of the flow path forming plate 41 of the liquid header 21.
As shown in FIGS. 6 to 10, each flow path 33 has an inflow side flow path 45, an outflow side flow path 46, and a communication port 47.

The inflow side flow path 45 is formed between the connection pipe mounting plate 42 and the flow path forming plate 41. The inflow side flow path 45 is composed of an inflow side recess 51 formed on a plate surface facing the connection pipe mounting plate 42 in the flow path forming plate 41.

As shown in FIGS. 5 and 9, the inflow side recess 51 has an inflow portion 52 and an annular portion 53. The inflow portion 52 and the annular portion 53 are arranged side by side in the vertical direction Z. The inflow portion 52 is formed in a substantially trapezoidal shape when viewed from the front. The inflow portion 52 is arranged at a position biased to one side (right side in FIG. 9) in the left-right direction Y. As shown in FIG. 8, the inflow portion 52 is arranged at a position facing the connection pipe 35 attached to the connection pipe mounting plate 42 in the front-rear direction X, and communicates with the connection pipe 35.

As shown in FIGS. 5 and 9, the annular portion 53 is arranged above the inflow portion 52. The annular portion 53 is formed in an annular shape when viewed from the front. The outer circumference and the inner circumference of the annular portion 53 are formed in a rectangular shape long in the vertical direction Z. The annular portion 53 has a first portion 53a, a second portion 53b, a third portion 53c, and a fourth portion 53d. The first portion 53a is arranged at a position biased to one side (right side in FIG. 9) in the left-right direction Y. The second portion 53b is arranged at a position biased toward the other side (left side in FIG. 9) in the left-right direction Y. The first portion 53a and the second portion 53b have the same length in the vertical direction Z. The first portion 53a communicates with the inflow portion 52.

The third portion 53c of the annular portion 53 connects the upper end portions of the first portion 53a and the second portion 53b to each other. The fourth portion 53d connects the lower ends of the first portion 53a and the second portion 53b to each other. The flow path forming plate 41 has a ridge portion 55 surrounded by a first portion 53a, a second portion 53b, a third portion 53c, and a fourth portion 53d. The ridge portion 55 protrudes from the bottom surface of the inflow side recess 51 and extends in the vertical direction Z.

As shown in FIG. 5, the refrigerant flowing through the connection pipe 35 attached to the connection pipe mounting plate 42 flows from the inflow portion 52 of the flow path forming plate 41 into the first portion 53a of the annular portion 53. The refrigerant flows upward through the first portion 53a, diverts at the third portion 53c, and flows downward through the second portion 53b. After that, the refrigerant circulates in the annular portion 53 by flowing through the fourth portion 53d and again in the first portion 53a.

The upper portion of the inflow portion 52 constitutes a throttle portion 52a whose length in the left-right direction Y is smaller than that of the lower portion of the inflow portion 52. Therefore, the refrigerant that has flowed from the connecting pipe 35 into the inflow portion 52 flows into the annular portion 53 in a state where the flow velocity is increased in the throttle portion 52a. Therefore, the circulation of the refrigerant in the annular portion 53 can be promoted.

As shown in FIG. 6, the outflow side flow path 46 of each flow path 33 is formed between the heat transfer tube mounting plate 43 and the flow path forming plate 41. A plurality of outflow side flow paths 46 of each flow path 33 are provided side by side in the vertical direction Z. Each outflow side flow path 46 is composed of an outflow side recess 58 formed in the flow path forming plate 41. Each flow path 33 of the present embodiment has six outflow side recesses 58. Each outflow side recess 58 is formed in a rectangular shape or a square shape when viewed from the front-rear direction X.

Each outflow side recess 58 is formed corresponding to one opening 43a formed in the heat transfer tube mounting plate 43, respectively. Each outflow side recess 58 communicates with a heat transfer tube 26 attached to the corresponding opening 43a.

As shown in FIG. 5, a plurality of communication ports 47 are provided in the second portion 53b of the inflow side recess 51 at intervals in the vertical direction Z. As shown in FIG. 6, the same number of communication ports 47 as the outflow side recesses 58 are provided, and the plurality of communication ports 47 are each provided in the outflow side recesses 58. The plurality of communication ports 47 communicate with the annular portion 53 of the inflow side recess 51 and the outflow side recess 58, respectively.

As shown in FIGS. 5 and 6, the refrigerant flowing from the connecting pipe 35 into the inflow side recess 51 in the liquid header 21 passes through each communication port 47 while circulating through the annular portion 53, and reaches each outflow side recess 58. Inflow. At this time, the refrigerant flows through the inflow side recess 51 and the communication port 47, so that the refrigerant is separated. The refrigerant that has flowed into each outflow side recess 58 flows into the heat transfer tube 26 attached to the heat transfer tube mounting plate 43.

As shown in FIG. 10, the communication port 47 is arranged at a position biased toward the lower side of the outflow side recess 58. On the other hand, the heat transfer tube 26 attached to the opening 43a of the heat transfer tube mounting plate 43 is arranged at a position corresponding to the substantially central portion of the upper and lower portions of the outflow side recess 58. Therefore, the communication port 47, the opening 43a, and the heat transfer tube 26 are arranged at positions that do not overlap each other when viewed from the front-rear direction X. Therefore, the refrigerant that has flowed into the outflow side recess 58 from the communication port 47 once diffuses in the outflow side recess 58 and then flows into the plurality of refrigerant flow paths 26p (see FIG. 4) of the heat transfer tube 26. Therefore, it is possible to suppress the drift of the refrigerant in the plurality of refrigerant flow paths 26p of the heat transfer tube 26.

As shown in FIGS. 9 and 10, the plate surface of the flow path forming plate 41 facing the connection pipe mounting plate 42 and the plate surface facing the heat transfer tube mounting plate 43 are recesses on the inflow side of each flow path 33. Grooves 60 and 70 surrounding the 51 and the outflow side recess 58 are formed. The grooves 60 and 70 function as holding grooves for holding the flux when the flow path forming plate 41 is joined to the connecting pipe mounting plate 42 and the heat transfer tube mounting plate 43 by brazing, and further inflows the brazing material. It functions as a passage for flowing around the side recess 51 and the outflow side recess 58.

As shown in FIG. 9, the groove 60 includes a first groove 61, a second groove 62, a third groove 63, and a fourth groove 64. The first groove 61 is continuously provided from the upper end portion to the lower end portion of the liquid header 21. The first groove 61 is provided on both sides in the left-right direction Y. The first groove 61 provided on one of the left and right sides (left side in FIG. 9) has a vertical groove portion 61a extending in the vertical direction Z and a horizontal groove portion 61b extending in the left-right direction Y.

In FIG. 9, the vertical groove portion 61a is arranged adjacent to the left side of the inflow side recess 51. Specifically, the vertical groove portion 61a has a first portion 61a1 adjacent to the inflow portion 52 of the inflow side recess 51 and a second portion 61a2 adjacent to the annular portion 53, and the first portion 61a1 forms a flow path. It is arranged at a substantially central portion of the plate 41 in the left-right direction Y. The first portion 61a1 and the second portion 61a2 are connected by a lateral groove portion 61b.

The first groove 61 provided on the other side (right side in FIG. 9) in the left-right direction Y extends in a straight line along the vertical direction Z.

The second groove 62 is arranged at one end and the other end of the liquid header 21 in the vertical direction Z. The second groove 62 extends along the left-right direction Y. The second groove 62 reaches the end surface of the flow path forming plate 41 in the left-right direction Y, and is open at the end surface. The second groove 62 is connected to the upper end and the lower end of the first groove 61 and communicates with the first groove 61.

The third groove 63 extends along the left-right direction Y and connects the first grooves 61 on both sides of the left-right direction Y. Specifically, the third groove 63 is located above the inflow side recess 51 of each flow path 33. The third groove 63 arranged between the flow paths 33 adjacent to the vertical direction Z is arranged in a straight line with the lateral groove portion 61b in the first groove 61.

The fourth groove 64 is provided on the tip surface of the ridge portion 55 arranged at the center of the annular portion 53 in the inflow side recess 51, and extends in the vertical direction Z.

As shown in FIG. 10, the groove 70 includes a first groove 71, a second groove 72, and a third groove 73. The first groove 71 is continuously provided from the upper end portion to the lower end portion of the liquid header 21. The first groove 71 extends linearly along the vertical direction Z on both sides of the flow path forming plate 41 in the left-right direction Y. The first groove 71 is arranged adjacent to the left and right sides of the outflow side recess 58 of the outflow side flow path 46.

The second groove 72 is arranged at one end and the other end of the flow path forming plate 41 in the vertical direction Z. The second groove 72 extends along the left-right direction Y. The second groove 72 reaches the end surface of the flow path forming plate 41 in the left-right direction Y, and is open at the end surface. The second groove 72 is connected to the upper end and the lower end of the first groove 71 and communicates with the first groove 71.

The third groove 73 extends along the left-right direction Y. The third groove 73 connects the first grooves 71 on both the left and right sides on the upper side and the lower side of the outflow side recess 58.

FIG. 11 is an enlarged view of part D of FIG. 7. FIG. 12 is an enlarged view of part E of FIG. 7.
As shown in FIG. 11, the flow path forming plate 41 and the connecting pipe mounting plate 42 are joined by brazing. Therefore, a brazing material 49 for joining the flow path forming plate 41 and the connecting pipe mounting plate 42 is arranged.

Similarly, as shown in FIG. 12, the flow path forming plate 41 and the heat transfer tube mounting plate 43 are joined by brazing. Therefore, a brazing material 49 for joining the flow path forming plate 41 and the heat transfer tube mounting plate 43 is arranged.

The flow path forming plate 41, the connecting pipe mounting plate 42, and the heat transfer tube mounting plate 43 are all made of aluminum or an aluminum alloy, and when brazing these, in order to remove the oxide film formed on the front plate surface. Flux is used. Specifically, before brazing the flow path forming plate 41, the connecting pipe mounting plate 42, and the heat transfer tube mounting plate 43, flux is applied to the plate surfaces on both sides of the flow path forming plate 41, and then the flow path is formed. The plate 41, the connecting tube mounting plate 42, and the heat transfer tube mounting plate 43 are brazed.

In the above brazing work, for example, if the flux is removed by the operator touching the flow path forming plate 41 coated with the flux by hand, the wettability of the brazing material deteriorates and the brazing becomes non-uniform. There is a risk of becoming. In the present embodiment, the grooves 60 and 70 are formed around the inflow side recess 51 and the outflow side recess 58 of the flow path forming plate 41. Therefore, the flux enters the grooves 60 and 70 to form the grooves. It can be kept within 60 and 70 to prevent the flux from being removed. At the time of brazing, the grooves 60 and 70 function as a passage for the brazing material, and the brazing material can be spread all around the inflow side recess 51 and the outflow side recess 58.

Of the grooves 60 and 70, the first grooves 61 and 71 are continuously provided between the upper end portion and the lower end portion of the flow path forming plate 41, so that the entire vertical direction Z of the flow path forming plate 41 is provided. It can retain the flux and spread the brazing material. Since the second grooves 62 and 72 extend in the left-right direction Y at the upper end and the lower end of the flow path forming plate 41, the flux is held at the upper end and the lower end of the flow path forming plate 41, and the brazing material is used. It can be distributed. Therefore, the upper end and the lower end of the flow path forming plate 41 can be reliably joined to the connection pipe mounting plate 42 and the heat transfer pipe mounting plate 43.

The third grooves 63 and 73 connect the first grooves 61 and 71 on both the left and right sides between the inflow side recesses 51 and the outflow side recesses 58 arranged in the vertical direction Z. Therefore, the flux can be held and the brazing material can be distributed between the inflow side recess 51 and the outflow side recess 58 arranged in the vertical direction Z, and the flow path forming plate 41, the connection pipe mounting plate 42, and the heat transfer pipe mounting plate can be distributed. The joint with 43 can be performed more reliably.

Since the grooves 60 and 70 surround the inflow side recess 51 and the outflow side recess 58, the connection pipe mounting plate 42 and the heat transfer tube mounting plate 43 are surely placed around the inflow side recess 51 and the outflow side recess 58. It can be attached, and the leakage of the refrigerant to the outside can be suppressed.

As shown in FIGS. 10 and 12, recesses 41a shallower than the outflow side recess 58 are formed on both sides of the outflow side recess 58 in the left-right direction Y of the flow path forming plate 41. The bottom surface of the recess 41a is in contact with the end surface of the heat transfer tube 26 inserted into the opening 43a of the heat transfer tube mounting plate 43. Therefore, the insertion amount of the heat transfer tube 26 with respect to the opening 43a is appropriately set.

[Action and effect of this embodiment]
(1) The liquid header 21 which is the laminated type header of the present embodiment has the flow path forming plate (first plate) 41 and the flow path forming plate 41 in the first direction X perpendicular to the plate surface of the flow path forming plate 41. The connection pipe mounting plate (second plate) 42, which is overlapped with the connection pipe 35 and is connected to the connection pipe 35, is overlapped with the flow path forming plate 41 on the opposite side of the connection pipe mounting plate 42 in the first direction X. It also includes a heat transfer tube mounting plate (third plate) 43 to which one heat transfer tube (first heat transfer tube) 26 and another heat transfer tube (second heat transfer tube) 26 are connected. An inflow side flow path (first flow path) 45 into which the refrigerant flows from the connection pipe 35 is formed between the flow path forming plate 41 and the connection pipe mounting plate 42, and the flow path forming plate 41 and the heat transfer tube mounting plate are formed. Between 43 and one outflow side flow path (second flow path) 46 that allows the refrigerant to flow into one heat transfer tube 26, and another outflow side flow path (second flow path) that allows the refrigerant to flow into the other heat transfer tube 26. The third flow path) 46 is formed. The flow path forming plate 41 has one communication port (first communication port) 47 that communicates the inflow side flow path 45 and one outflow side flow path 46, and the inflow side flow path 45 and another outflow side flow. Another communication port (second communication port) 47 that communicates with the road 46 is formed, and the flow path forming plate 41 is an inflow side that forms an inflow side flow path 45 on the plate surface facing the connection pipe mounting plate 42. It has a recess (first recess) 51.

With the above configuration, the liquid header 21 which is a laminated header can be configured by using the three plates 41, 42, 43. Therefore, the number of parts of the liquid header 21 can be reduced. Since the flow path forming plate 41 has the inflow side recess 51, the inflow side flow path 45 can be easily formed between the flow path forming plate 41 and the connecting pipe mounting plate 42.

(2) In the above embodiment, the connection pipe mounting plate 42 has an opening 42a penetrating in the first direction X. The connection pipe mounting plate 42 has a flat surface having a plate surface facing the flow path forming plate 41 excluding the opening 42a. Therefore, the structure of the connecting pipe mounting plate 42 can be simplified.

(3) In the above embodiment, the flow path forming plate 41 has one outflow side recess (second recess) 58 forming one outflow side flow path 46 on the plate surface facing the heat transfer tube mounting plate 43, and one outflow side recess (second recess) 58. , It has another outflow side recess (third recess) 58 that forms another outflow side flow path 46. Therefore, the outflow side flow path 46 can be easily formed between the flow path forming plate 41 and the heat transfer tube mounting plate 43. Since the flow path forming plate 41 has the inflow side recess 51 and the outflow side recess 58, the structures of the connection pipe mounting plate 42 and the heat transfer pipe mounting plate 43 can be simplified.

(4) The liquid header 21 which is the laminated type header of the present embodiment has the flow path forming plate (first plate) 41 and the flow path forming plate 41 in the first direction X perpendicular to the plate surface of the flow path forming plate 41. The connection pipe mounting plate (second plate) 42, which is overlapped with the connection pipe 35 and is connected to the connection pipe 35, is overlapped with the flow path forming plate 41 on the opposite side of the connection pipe mounting plate 42 in the first direction X. It also includes a heat transfer tube mounting plate (third plate) 43 to which one heat transfer tube (first heat transfer tube) 26 and another heat transfer tube (second heat transfer tube) 26 are connected. An inflow side flow path (first flow path) 45 into which the refrigerant flows from the connection pipe 35 is formed between the flow path forming plate 41 and the connection pipe mounting plate 42, and the flow path forming plate 41 and the heat transfer tube mounting plate are formed. Between 43 and one outflow side flow path (second flow path) 46 that allows the refrigerant to flow into one heat transfer tube 26, and another outflow side flow path (second flow path) that allows the refrigerant to flow into the other heat transfer tube 26. The third flow path) 46 is formed. The flow path forming plate 41 has one communication port (first communication port) 47 that communicates the inflow side flow path 45 and one outflow side flow path 46, and the inflow side flow path 45 and another outflow side flow. Another communication port (second communication port) 47 that communicates with the road (third flow path) 46 is formed. The flow path forming plate 41 includes one outflow side recess (second recess) 58 that forms one outflow side flow path 46 on the plate surface facing the heat transfer tube mounting plate 43, and another outflow side flow path 46. It has another outflow side recess (third recess) 58 that forms the above.

With the above configuration, the liquid header 21 which is a laminated header can be configured by using the three plates 41, 42, 43. Since the flow path forming plate 41 has the outflow side recess 58, the outflow side flow path 46 can be easily formed between the flow path forming plate 41 and the heat transfer tube mounting plate 43.

(5) In the above embodiment, the heat transfer tube mounting plate 43 has an opening 43a penetrating in the first direction X, and the plate surface facing the flow path forming plate 41 excluding the opening 43a is a flat surface. Therefore, the structure of the heat transfer tube mounting plate 43 can be simplified.

(6) In the above embodiment, the heat transfer tube 26 is a multi-hole tube having a plurality of refrigerant flow paths inside. The heat transfer tube mounting plate 43 has one opening (first opening) 43a and another opening (second opening) 43a to which one heat transfer tube 26 and another heat transfer tube 26 are connected, respectively, and has one communication port. The 47 is arranged at a position that does not overlap with one opening 43a when viewed from the first direction X, and the other communication port 47 is arranged at a position that does not overlap with the other opening 43a when viewed from the first direction X. Therefore, the refrigerant flowing into one outflow side flow path 46 and the other outflow side flow path 46 from one communication port 47 and the other communication port 47 is further a multi-hole tube, that is, one heat transfer tube 26 and another transfer. It is possible to suppress the uneven flow of the refrigerant into each refrigerant flow path 26p when it flows into each refrigerant flow path 26p of the heat pipe 26.

(7) In the above embodiment, the inflow side flow path 45 has an annular portion 53 which is formed in an annular shape and circulates the refrigerant. Therefore, the refrigerant can be uniformly divided through one communication port 47 and the other communication port 47 while circulating the refrigerant in the inflow side flow path 45.

(8) In the above embodiment, the flow path forming plate 41, the connecting pipe mounting plate 42, and the heat transfer tube mounting plate 43 have a length in the second direction Z larger than the length in the third direction Y, and the liquid header 21. Projects from the heat transfer tube mounting plate 43 toward the flow path forming plate 41 on both sides of the heat transfer tube mounting plate 43 in the third direction Y, and of the flow path forming plate 41 and the connecting pipe mounting plate 42 in the third direction Y. It has a covering member 44 that covers the end face. Therefore, the relative positions of the flow path forming plate 41, the connecting pipe mounting plate 42, and the heat transfer pipe mounting plate 43 in the third direction Y can be appropriately set.

The present disclosure is not limited to the above examples, and is shown by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

In the above-described embodiment, the number of heat exchange units 31 in the outdoor heat exchanger 14, the number of heat transfer tubes 26 in each heat exchange unit 31, and the number of flow paths 33 in the liquid header 21 are limited to the above-described embodiment. It is not a thing and can be changed as appropriate.

In the liquid header 21, when the inflow side recess 51 is formed only in the flow path forming plate 41, the outflow side recess 58 is formed in both the flow path forming plate 41 and the heat transfer tube mounting plate 43, or in the heat transfer tube mounting plate 43. It may be formed. When the outflow side recess 58 is formed only in the flow path forming plate 41, even if the inflow side recess 51 is formed in both the flow path forming plate 41 and the connecting pipe mounting plate 42, or in the connecting pipe mounting plate 42. good.

1: Air conditioner (refrigerator)
14: Outdoor heat exchanger 21: Liquid header (laminated header)
26: Heat transfer pipe 26p: Refrigerant flow path 35: Connection pipe (refrigerant pipe)
41: Flow path forming plate (first plate)
42: Connection pipe mounting plate (second plate)
42a: Opening 43: Heat transfer tube mounting plate (third plate)
43a: Aperture (first opening, second opening)
44: Cover 45: Inflow side flow path (first flow path)
46: Outflow side flow path (second flow path, third flow path)
47: Communication port 51: Inflow side recess (first recess)
53: Circular portion 58: Outflow side recess (second recess, third recess)
X: Front-back direction (first direction)
Y: Left-right direction (third direction)
Z: Vertical direction (second direction)

Claims (10)

First plate (41) and
A second plate (42) that is overlapped with the first plate (41) and is connected to the refrigerant pipe (35) in the first direction (X) perpendicular to the plate surface of the first plate (41).
The first heat transfer tube (26) and the second heat transfer tube (26) are connected to the first plate (41) on the side opposite to the second plate (42) in the first direction (X). With a third plate (43)
A first flow path (45) into which the refrigerant flows from the refrigerant pipe (35) is formed between the first plate (41) and the second plate (42).
Between the first plate (41) and the third plate (43), a second flow path (46) for allowing the refrigerant to flow into the first heat transfer tube (26) and the second transfer for the refrigerant. A third flow path (46) to flow into the heat tube (26) is formed.
The first plate (41) includes a first communication port (47) that communicates the first flow path (45) and the second flow path (46), and the first flow path (45). A second communication port (47) that communicates with the third flow path (46) is formed.
The first plate (41) is a laminated header having a first recess (51) forming the first flow path (45) on a plate surface facing the second plate (42). The second plate (42) has an opening (42a) penetrating in the first direction (X), and the plate surface facing the first plate (41) excluding the opening (42a) is flat. The laminated header according to claim 1, which is a surface. The first plate (41) has a second recess (58) forming the second flow path (46) on a plate surface facing the third plate (43), and the third flow path (46). The laminated header according to claim 1 or 2, which has a third recess (58) forming a). First plate (41) and
A second plate (42) that is overlapped with the first plate (41) and is connected to the refrigerant pipe (35) in the first direction (X) perpendicular to the plate surface of the first plate (41).
The first heat transfer tube (26) and the second heat transfer tube (26) are connected to the first plate (41) on the side opposite to the second plate (42) in the first direction (X). With a third plate (43)
A first flow path (45) into which the refrigerant flows from the refrigerant pipe (35) is formed between the first plate (41) and the second plate (42).
Between the first plate (41) and the third plate (43), a second flow path (46) for allowing the refrigerant to flow into the first heat transfer tube (26) and the second transfer for the refrigerant. A third flow path (46) to flow into the heat tube (26) is formed.
The first plate (41) includes a first communication port (47) that communicates the first flow path (45) and the second flow path (46), and the first flow path (45). A second communication port (47) that communicates with the third flow path (46) is formed.
The first plate (41) has a second recess (58) forming the second flow path (46) on a plate surface facing the third plate (43), and the third flow path (46). ), A laminated header having a third recess (58). The third plate (43) has an opening (43a) penetrating in the first direction (X), and the plate surface facing the first plate (41) excluding the opening (43a) is a flat surface. The laminated header according to claim 3 or 4. The first heat transfer tube (26) and the second heat transfer tube (26) are multi-hole tubes having a plurality of refrigerant flow paths (26p) inside.
The third plate (43) has a first opening (43a) and a second opening (43a) to which the first heat transfer tube (26) and the second heat transfer tube (26) are connected, respectively.
The first communication port (47) is arranged at a position that does not overlap with the first opening (43a) when viewed from the first direction (X), and the second communication port (47) is in the first direction (X). ), The laminated header according to any one of claims 1 to 5, which is arranged at a position not overlapping with the second opening (43a). The laminated header according to any one of claims 1 to 6, wherein the first flow path (45) is formed in an annular shape and has an annular portion (53) for circulating a refrigerant. The first plate (41), the second plate (42), and the third plate (43) have the length of the second direction (Z) orthogonal to the first direction (X) as the first. Greater than the length of the direction (X) and the third direction (Y) orthogonal to the second direction (Z),
The first plate (41) and the first plate (41) in the third direction (Y) and projecting toward the first plate (41) on both sides of the third plate (43) in the third direction (Y). 2. The laminated header according to any one of claims 1 to 7, which has a covering portion covering the end face of the plate (42). A heat exchanger comprising the laminated header (21) according to any one of claims 1 to 8. A refrigerating apparatus comprising the heat exchanger (14) according to claim 9.

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