JPH0674602A - Laminated heat exchanger - Google Patents

Abstract

PURPOSE:To prevent droplets from being scattered by a method wherein an inner side surface of a side plate is formed with some grooves extending in a vertical direction and projected at an outer surface. CONSTITUTION:An inner surface of a side plate 90 is formed with three grooves 91 extending in a vertical direction and projected at an outer surface. Condensed water at the inner surface of the side plate 90 is guided by the three grooves 91 and flows down. The side plate 90 is formed with a plurality of through-pass holes 92 and a diameter of each of the through-pass holes 92 is set to be gradually increased in its diameter from a lower one to an upper one. Condensed water at an inner circumferential surface of the side plate 90 is discharged out of the heat exchanger through the through-pass holes 92. Thus, it is possible to prevent condensed water from being accumulated inside the side plate 90 and to prevent dew water from being splashed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a laminated heat exchanger for an air conditioner.

[0002]

2. Description of the Related Art A conventional laminated heat exchanger will be described with reference to FIGS. FIG. 8 shows a side surface of a conventional laminated heat exchanger, and FIG. 9 shows an enlarged cross section of a right side portion.

In FIGS. 8 and 9, 1 is a flat tube, and the flat tube 1 is formed by abutting two press-formed plates 2. An inlet / outlet tank portion 3 is formed at one end portion (upper end portion in the figure) of the flat tube 1.

The flat tubes 1 and the corrugated fins 4 are alternately laminated, and the inlet / outlet tank portion 3 is connected to form a laminated heat exchanger (evaporator) 5.

The outer sides of the flat tubes 1a located at both ends serve as end plates 6, and the end plates 6 in the inlet / outlet tank section 3 are provided with flow holes 7. One of the circulation holes 7 is connected to a refrigerant introduction pipe 8 as a fluid, and the other circulation hole 7 is connected to a refrigerant discharge pipe 9.

The introduction pipe 8 and the discharge pipe 9 are fixed by a side plate 10, and a corrugated fin 4 is provided between the side plate 10 and the end plate 6.

The inlet / outlet tank portion 3 is partitioned into an inlet portion 11 and an outlet portion 12 in the plate width direction of the flat tube 1, and when the evaporator 5 is constructed, the adjacent inlet / outlet tank portions 3 are in the inlet portions 11 and the outlet portion 12. The communication holes 13 communicate with each other.

A flat tube 1 based on FIGS. 10 and 11.
Will be explained. FIG. 10 shows the front surface of the plate 2 constituting the flat tube 1, and FIG. 11 shows a view taken along the line XI-XI in FIG.

An inlet / outlet tank section 3 is provided at the upper end of the plate 2.
A bulging portion 14 for forming a space is provided, and the inner space of the plate 2 is partitioned into two chambers 16 and 17 by a partition wall 15 that extends vertically in the central portion. The partition wall 15 lacks the lower end portion, and the lower end of the plate 2 is a U-turn portion 18 that makes a U-turn of the refrigerant. By abutting the two plates 2, the partition wall 15 partitions the inlet / outlet tank part 3 into an inlet part 11 and an outlet part 12, and a chamber continuous with the inlet part 11 and a chamber continuous with the outlet part 12. Divided into 17. Further, the chamber 16 and the chamber 17 are U
The turn portion 18 communicates with each other, and the chambers 16 and 17 and the U-turn portion 18 form a fluid passage.

A large number of ribs 19 project from the chambers 16 and 17, and the insides of the chambers 16 and 17 are subdivided into a labyrinth. A guide rib 20 is provided on the U-turn portion 18 so that the refrigerant flows from the chamber 16 to the chamber 17 by the guide rib 20 (U-turn).
Will be guided.

The evaporator 5 described above with reference to FIG.
The flow of the refrigerant will be described. FIG. 12 shows the flow state of the refrigerant.

The evaporator 5 comprises three groups 21, 22, 2
The groups 21 and 23 to which the introduction pipe 8 and the discharge pipe 9 are connected have the same arrangement of the inlet portion 11 and the outlet portion 12, and the inlet portion 11 and the outlet portion 1 in the group 22 are the same.
The arrangement of 2 is reversed. The inlet / outlet tank portions 3 facing each other between the groups 21 and 22 and between the groups 22 and 23 are
The outlet 12 of 1 and the inlet 11 of the group 22 communicate with each other,
The outlet 12 of the group and the inlet 11 of the group 23 communicate with each other. The inlet portion 11 of the group 21 is connected to the introduction pipe 8 by the flow hole 7 of the end plate 6, and the outlet portion 12 of the group 23 is connected to the discharge pipe 9 by the flow hole 7 of the end plate 6.

The refrigerant 31 introduced into the evaporator 5 from the introduction pipe 8 is sent from the inlet portion 11 of the group 21 through the chamber 16 to the U-turn portion 18, is U-turned in the U-turn portion 18 and passes through the chamber 17. Sent to the outlet section 12. The refrigerant 31 sent to the outlet 12 of the group 21 is sent to the inlet 11 of the group 22 and sent to the group 23 in the same flow as the group 21,
Is discharged from the discharge pipe 9 through the fluid passage (chambers 16, 17, U-turn portion 18).

During this time, air 3 is caught between the corrugated fins 4.
2 is sent and the air 32 is cooled using the latent heat of vaporization of the refrigerant 31.

[0015]

In the evaporator 5 described above, dehumidification is performed by lowering the temperature of the air 32 to below the dew point temperature, but when the air 32 falls below the dew point temperature, it becomes dew and the outer surface of the flat tube 1 and Condensation forms on the inner surface of the end plate 6. In particular, in the lower part of the downstream side of the air 32, the condensed water that has flowed down may be mixed with each other, and the condensed water may accumulate and hinder the heat exchange. When the amount of dew condensation increases, the air 32
Condensed water is blown away by the flow of, and so-called dew splash occurs.

On the outer surface of the flat tube 1, the chambers 16, 1
There is a groove in the part of the partition wall 15 that partitions 7 and the condensed water condensed in the part of the flat tube 1 tends to flow down to the lowermost part along the groove. However, there is no groove or the like for guiding the condensed water on the inner peripheral surface of the side plate 6, and dew fly is likely to occur on the inner peripheral surface of the side plate 6.

[0017]

According to the structure of the present invention for solving the above-mentioned problems, a large number of tubes and corrugated fins composed of a tank portion and a core portion are alternately laminated, and an outer wall plate is formed on the outer side in the laminating direction. In the laminated heat exchanger provided with the side plate, a groove extending in the vertical direction is formed on the inner side surface of the side plate and a convex groove is formed on the outer side surface.

The structure of the present invention for solving the above-mentioned problems is characterized in that a through hole for discharging condensed water is provided in at least a lower portion of the side plate.

[0019]

[Operation] Condensed water inside the side plate is guided by the groove and flows down. Since the groove has a convex shape on the outer side surface, the rigidity of the side plate is enhanced.

The condensed water is guided by the groove and flows down, and is discharged to the outside through the through hole in the lower portion of the side plate.

[0021]

FIG. 1 is a side view of a laminated heat exchanger according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, FIG. 3 is a view taken in the direction of arrow III in FIG. Shows a view taken along the line IV-IV in FIG.

In the figure, 81 is a flat tube,
The flat tube 81 is a press-formed two plate 8
2 are butted. An inlet / outlet tank portion 83 as a tank portion is formed at one end (upper end portion in FIGS. 1 and 3) of the flat tube, and the other end side of the flat tube 81 other than the inlet / outlet tank portion 83 is a core portion.

Flat tube 81 and corrugated fin 84
Are alternately stacked, and the inlet / outlet tank portions 83 are connected to form a stacked heat exchanger (evaporator) 85.

The outer sides of the flat tubes 81a located at both ends serve as end plates 86, and the end plates 86 in the inlet / outlet tank section 83 are provided with flow holes 87. One of the flow holes 87 is connected to an inlet header 88 for a coolant as a fluid, and the other flow hole 87 is connected to an outlet header 89 for a coolant. Corrugated fins 84 are arranged outside the end plates 86, and side plates 90 as outer wall plates are attached to the outside of each corrugated fin 84.

The flat tube 81 will be described with reference to FIGS. 6 is an exploded perspective view of the flat tube 81, FIG.
Shows a view taken along the line VII-VII in FIG.

The inner space of the plate 82 is divided into two chambers 48, 49 by a partition wall 47 extending in the vertical direction at the center. The partition wall 47 lacks the lower end portion, and the lower end of the plate 82 serves as a U-turn portion 50 that makes a U-turn of the refrigerant as a fluid. By abutting the two plates 82, the partition wall 47 allows the entrance / exit tank portion 83
Is partitioned into an inlet portion 44 and an outlet portion 45, and a chamber 48 continuous with the inlet portion 44 and a chamber 49 continuous with the outlet portion 45.
It is divided into and. Further, the chamber 48 and the chamber 49 are communicated with each other by the U-turn portion 50, and the fluid passage 51 is formed by the chambers 48, 49 and the U-turn portion 50.

Corrugated inner fins 52 and 53 are inserted into the chambers 48 and 49 (straight line portions) of the fluid passage 51. As shown in FIG. 4, in the corrugated inner fins 52 and 53, the flow path 5 along the length direction (vertical direction) of the chambers 48 and 49 is provided.
A plurality of corrugations 52a and 53a are formed along the length direction so that a plurality of sections 4 and 55 are partitioned and formed.

In the chambers 48 and 49, projecting walls 67 are formed which extend in parallel with the partition wall 47 and in which the outside of the plate 82 has a groove shape. When the two plates 82 are butted and joined to each other, as shown in FIG.
Is mounted with the central portion sandwiched by the protruding wall 67.

By forming the groove on the outer side of the plate 82 by the projecting wall 67, the groove formed by the partition wall 47 and the groove formed by the projecting wall 67 exist on the outer surface of the flat tube 81. Therefore, the flow of condensed water can be promoted to prevent dew splashing.

In the U-turn portion 50 of the fluid passage 51, a plurality of U-shaped flow paths 56 for guiding the U-turn of the refrigerant are divided and formed. The U-shaped channel 56 is formed by a plurality of U-shaped beads 57 press-molded on the abutting surface of the plate 82, and the U-shaped channel 56 is U-shaped along the shape of the plate 82.

In the flat tube 81 described above, the inlet portion 4
Refrigerant as a fluid flowing in from No. 4 is guided to the U-turn portion 50 through the flow path 54 partitioned by the corrugated inner fin 52, and is U-turned by the U-shaped flow path 56 partitioned by the U-shaped bead 57. , Through the flow passage 55 defined by the corrugated inner fin 53 to the outlet portion 45. An example of the flow of the refrigerant and the air in the entire evaporator 85 in which the flat tubes 81 and the corrugated fins 84 are alternately laminated is the same as the situation shown in FIG.

As shown in FIGS. 1 to 4, on the inner surface of the side plate 90, three grooves 91 are formed which extend in the vertical direction and are convex on the outer surface. The condensed water on the inner side surface of the side plate 90 is guided by the three grooves 91 and flows down.

Further, as shown in FIG. 3, a plurality of through holes 92 are formed in the side plate 90, and the diameter of the lower through holes 92 is gradually increased. Condensed water on the inner peripheral surface of the side plate 90 is discharged to the outside through the through hole 92.

Grooves 91 and through holes 9 are formed in the side plate 90.
By providing 2, the condensed water inside the side plate 90 is guided by the groove to flow down, and is discharged to the outside through the through hole 92, so that the condensed water does not flow to the downstream side of the air.

The side plate 9 is based on FIGS. 1 and 5.
The state of the upper part of 0 will be described. FIG. 5 shows an enlarged state of an arrow V portion in FIG.

The outlet header 89 has a substantially rectangular cross section,
It is connected to the flow hole 87 of the end plate 86. A horizontal portion 93 is formed at the upper end of the side plate 90,
The tip of the horizontal portion 93 is joined to the end plate 86.

The lower surface of the outlet header 89 and the upper surface of the horizontal portion 93 are in contact with each other and are joined to each other by brazing.

Since the outlet header 89 and the side plate 90 are joined to each other, the force in the expanding direction applied to the inlet / outlet tank portion 83 when pressure is applied is received by the side plate 90, and deformation of the entire evaporator 85 is suppressed. . Since the side plate 90 is provided with the groove 91 that is convex on the outer side surface, it has sufficient strength and can reliably suppress deformation.

Since the plate portion 82 is joined to the core portion of the evaporator 85 via the corrugated inner fins 52 and 53, there are many brazing portions, and there is a large difference in strength between the inlet / outlet tank portion 83 and the core portion. Therefore, when pressure is applied, a large difference occurs in the amount of deformation between the core portion and the inlet / outlet tank portion 83. Therefore, by joining the outlet header 89 and the side plate 90, the deformation of the evaporator 85, which is disadvantageous in terms of strength, can be sufficiently suppressed.

5 shows the joint between the outlet header 89 and the side plate 90, the inlet header 88 has the same shape as the outlet header 89, and the joint with the side plate 90 has the same structure.

In the evaporator 85 described above, since the lower surfaces of the inlet header 88 and the outlet header 89 are joined to the upper surface of the side plate 90, the force in the spreading direction applied to the inlet / outlet tank portion 83 when pressure is applied is the side plate 90.
Therefore, it is possible to suppress the entire deformation of the evaporator 85 which has a large strength difference between the core portion and the inlet / outlet tank portion 83.

Further, the inlet header 88 and the outlet header 89
Since there is no gap between the side plate 90 and
Air leakage does not occur, and there is no risk of deterioration of heat exchange performance.

[0043]

In the laminated heat exchanger of the present invention, the inner surface of the side plate is formed with the groove extending in the vertical direction and having the convex shape on the outer surface, so that the condensed water inside the side plate is formed in the groove. They are guided and flow down. As a result, the condensed water does not accumulate inside the side plate, and there is no risk of being blown off backward by the air flow and flying out. Also,
Since the groove is convex on the outer circle, the rigidity of the side plate is improved.

Further, since the through hole is provided at least in the lower part of the side plate, the condensed water inside the side plate is guided by the groove to flow down and is discharged to the outside from the through hole. As a result, it is possible to reliably prevent dew flying.

[Brief description of drawings]

FIG. 1 is a side view of a laminated heat exchanger according to an embodiment of the present invention.

FIG. 2 is a view on arrow II in FIG.

FIG. 3 is a view on arrow III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is an enlarged view of an arrow V portion in FIG.

FIG. 6 is an exploded perspective view of a flat tube.

7 is a view taken along the line VII-VII in FIG.

FIG. 8 is a side view of a conventional laminated heat exchanger.

9 is an enlarged cross-sectional view of the right side portion in FIG.

FIG. 10 is a front view of a plate forming a flat tube.

11 is a view taken along the line XI-XI in FIG.

FIG. 12 is an explanatory diagram of a refrigerant flow state of the laminated heat exchanger.

[Explanation of symbols]

 44 inlet part 45 outlet part 46 communication hole 47 partition wall 48,49 chamber 50 U turn part 51 fluid passage 52,53 corrugated inner fin 54,55 flow path 56 U-shaped flow path 57 U-shaped bead 81 flat tube 82 plate 83 Inlet / outlet tank section 84 Corrugated fins 85 Laminated heat exchanger 86 End plate 87 Flow hole 88 Inlet header 89 Outlet header 90 Side plate 91 Groove 92 Through hole 93 Horizontal part

Front Page Continuation (72) Inventor Hiroshi Imokawa 3-chome, Asahi-cho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (2)

[Claims] 1. A laminated heat exchanger in which a large number of tubes and corrugated fins each including a tank portion and a core portion are alternately laminated, and a side plate as an outer wall plate is provided on the outer side in the laminating direction. A laminated heat exchanger characterized in that a groove extending in the vertical direction is formed on a side surface and a groove in a convex state is formed on an outer surface. 2. The laminated heat exchanger according to claim 1, wherein a through hole for discharging condensed water is provided in at least a lower portion of the side plate.