JP2020094786A - Heat exchanger - Google Patents

Abstract

To prevent a ventilation passage to be obstructed due to frost formation and improve the durability of a pipe member through which a heat medium flows.SOLUTION: A tube 13 includes a tube shell 22 the inside of which is hollow, and an inner fin 23 fixed to the inside of the tube shell 22. The tube 13 has a protrusion 24 formed to protrude windward beyond the tube shell 22 along the depth direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to heat exchangers.

In a heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant pipe and the air passing through the fins, if frost forms on the tips of the fins and blocks the ventilation passages, the heat exchange efficiency decreases. Patent Document 1 proposes to project the refrigerant pipe to the windward side of the fin in order to prevent the ventilation passage from being blocked by frost.

Japanese Unexamined Patent Publication No. 8-327268

The heat exchanger is arranged in the front grill of the vehicle body, and there is a risk of refrigerant leakage when the refrigerant pipe protruding to the windward side is damaged by flying stones.
An object of the present invention is to prevent the ventilation passage from being blocked by frost and improve the durability of the piping member through which the heat medium flows.

A heat exchanger according to one aspect of the present invention,
The directions orthogonal to each other are the first direction, the second direction, and the third direction,
A plurality of piping members extending in the first direction and provided at intervals in the second direction, through which the heat medium flows,
A plate member that is fixed between adjacent pipe members and partitions the ventilation path provided between the adjacent pipe members along the first direction into a plurality of sections,
A heat medium that exchanges heat between the heat medium that flows inside the piping member and the air that flows around the piping member and the plate member,
The piping members are
With an outer hollow part inside,
An inner shell portion fixed inside the outer shell portion and partitioning the flow path along which the heat medium flows along the third direction into a plurality of compartments,
And a protrusion that protrudes further to the windward side than the outer portion along the third direction.

According to the present invention, by providing the projecting portion projecting to the windward side with respect to the outer shell portion, frost is generated from the projecting portion, and it is possible to suppress blockage of the ventilation passage. Further, since the stepping stone is received by the projecting portion, it is possible to suppress damage to the outer shell portion through which the heat medium flows, and the durability of the piping member is improved.

It is a figure which shows a heat exchanger. It is a figure showing the details of a tube and a fin. It is sectional drawing of a header. It is a figure which shows the modified examples 1 and 2. It is a figure which shows the modified examples 3 and 4.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are schematic and may differ from the actual ones. Further, the following embodiments exemplify devices and methods for embodying the technical idea of the present invention, and the configuration is not limited to the following. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

<< one embodiment >>
"Constitution"
In the following description, the three directions orthogonal to each other are referred to as a vertical direction (first direction), a horizontal direction (second direction), and a depth direction (third direction) for convenience. The vertical direction is the vertical direction.
FIG. 1 is a diagram showing a heat exchanger.
Here, the front view of the heat exchanger 11, that is, the state viewed from the windward side in the depth direction is shown. The heat exchanger 11 functions as an evaporator in a heat pump cycle and a refrigeration circuit such as a car air conditioner and a showcase. The heat exchanger 11 made of aluminum includes a pair of upper and lower headers 12, a plurality of tubes 13 (piping members), and a plurality of fins 14 (plate members).

The pair of headers 12 extend in the horizontal direction and are provided at intervals in the vertical direction. The header 12 is formed by a cylindrical pipe whose both ends are closed, and the inside thereof is partitioned by a partition wall 17 into laterally arranged sections. The inside of the upper header 12 is divided into a section 12A on one lateral side and a section 12B on the other lateral side, and an inflow port 15 is provided in the section 12A on one lateral side. The interior of the lower header 12 is divided into a section 12C on the one side in the horizontal direction and a section 12D on the other side in the horizontal direction, and a discharge port 16 is provided in the section 12D on the other side in the horizontal direction.

Each tube 13 extends in the vertical direction, has its upper end and lower end connected to the header 12, and is provided at equal intervals along the horizontal direction. The tube 13 has a flat shape that is thin in the lateral direction, and is brazed to the header 12 with both ends communicating with the inside of the header 12. Here, the case where there are 12 lines is shown, and when identifying each, 13a to 13l are set in order from one end to the other end in the horizontal direction. In the upper header 12, the tube 13d and the tube 13e are partitioned by a partition wall 17, and in the lower header 12, the tube 13h and the tube 13i are partitioned by a partition wall 17.
Each fin 14 is fixed between adjacent tubes 13 by brazing.

A flow path is formed by the header 12 and the tube 13, and a refrigerant (heat medium) flows through the flow path. That is, first, it flows into the section 12A on the one side in the horizontal direction of the upper header 12 through the inflow port 15, is distributed to the tubes 13a to 13d, and then flows into the section 12C on the one side in the horizontal direction of the lower header 12. Next, after being distributed to the tubes 13e to 13h, it flows into the section 12B on the other side in the lateral direction of the upper header 12, and then is distributed to the tubes 13i to 13l and then to the other side of the other side in the lateral direction of the lower header 12. It flows into the compartment 12D and is discharged through the discharge port 16. Thus, when the refrigerant flows through each tube 13, it exchanges heat with the air flowing around the tubes 13 and the fins 14. That is, the refrigerant evaporates and evaporates, so that the temperature of the refrigerant is increased by absorbing heat, and one of the air is cooled.

Next, details of the tube 13 and the fin 14 will be described.
FIG. 2 is a diagram showing details of the tubes and the fins.
(A) in the figure is a view of the tubes 13 and the fins 14 viewed from the windward side in the depth direction. The fins 14 are corrugated fins formed by folding a thin plate in a wavy shape. One fin 14 can partition adjacent tubes 13 into a plurality of sections along the vertical direction. Each section surrounded by the fins 14 and the tubes 13 serves as a ventilation path 21 for flowing air in the depth direction.

(B) in the figure is a view of the tube 13 and the fins 14 as seen from the vertical direction, and shows a cross section of the tube 13. The tube 13 includes a tube shell 22 (outer shell), an inner fin 23 (inner shell), and a protrusion 24.
The tube shell 22 is formed into a hollow tubular shape by bending a plate material in the circumferential direction in a vertical cross section and joining the circumferential end portions by brazing. The ends to be brazed are laid out so as to be on the windward side in the depth direction. The outer dimension of the tube shell 22 in the depth direction corresponds to the dimension of the fin 14 in the depth direction.

The inner fin 23 is a corrugated fin formed by folding a thin plate in a wavy pattern, and is fixed inside the tube shell 22 by brazing. With one inner fin 23, it is possible to partition the inside of the tube shell 22 into a plurality of sections along the depth direction. The outer dimension of the inner fin 23 in the lateral direction corresponds to the inner dimension of the tube shell 22 in the lateral direction. The vertical dimension of the inner fin 23 corresponds to the vertical dimension of the tube shell 22. Each section surrounded by the inner fins 23 and the inner peripheral surface of the tube shell 22 serves as a flow path 25 for flowing the refrigerant in the vertical direction.

The projecting portion 24 is a plate material having the longitudinal direction and the depth direction as the surface direction, is integrally formed with the inner fin 23, and projects outward from the joint portion of the plate materials forming the tube shell 22. The projecting portion 24 projects further upwind than the tube shell 22 and the ventilation passage 21 along the depth direction. It is desirable that the amount of protrusion is 10% to 40% of the width of the tube, which protrudes further to the windward side than the tip of the fin.
FIG. 3 is a sectional view of the header.
Here, a state where the insertion portion of the tube 13 into the header 12 is viewed from the lateral direction is shown. Since the vertical end of the tube 13 is inserted into the header 12, the protrusion 24 is shorter than the tube 13 in the vertical direction so as not to interfere with the header 12.

《Action》
Next, the main effects of one embodiment will be described.
In order to prevent the ventilation passage 21 from being blocked by frost, it is conceivable that the tube 13 protrudes to the windward side of the ventilation passage 21 or the fins 14. However, the heat exchanger 11 is arranged in the front grill of the vehicle body, and there is a risk of refrigerant leakage if the tube 13 that has jumped out to the windward side is damaged by flying stones.
Therefore, the tube 13 is formed with a protrusion 24 that protrudes further to the windward side than the tube shell 22 along the depth direction. As a result, the projecting portion 24 is subjected to flying stones, so damage to the tube shell 22 can be suppressed, and durability is improved. Further, the frost is preferentially generated from the protruding portion 24 protruding to the windward side, so that the ventilation passage 21 can be prevented from being blocked. This can suppress a decrease in heat exchange efficiency. Further, in the present invention, since the tube 13 includes the inner fin 23, the pressure resistance of the tube 13 is improved, and the risk of refrigerant leakage can be reduced.

The protrusion 24 extends in the vertical direction, that is, the vertical direction. As a result, when the defrosting operation is performed, the melted droplets quickly flow down, which leads to a shortening of the defrosting operation.
The protrusion 24 is provided on all of the tubes 13a to 13l. As a result, the tubes 13 can be made common and the assemblability is improved.
The projecting portion 24 is formed in a plate shape having the longitudinal direction and the depth direction as the surface directions. As described above, the simple shape facilitates manufacturing and suppresses an increase in manufacturing cost.

<Modification>
In the embodiment, the tube shell 22 formed by bending one plate material and the protruding portion 24 integrally formed with the inner fin 23 have been described, but the present invention is not limited thereto.
FIG. 4 is a diagram showing Modifications 1 and 2.
(A) in the figure shows a first modification. Here, the protrusions 24 and the inner fins 23 are separate bodies, and the protrusions 24 are integrally formed at one end of the plate material forming the tube shell 22. As described above, even if the protruding portion 24 is integrally formed with the tube shell 22, the above-described operational effects can be obtained. Further, by integrally forming the protrusion on the end of the tube shell 22, the number of brazing points is reduced, so that the risk of refrigerant leakage is reduced.
(B) in the figure shows a second modification. Here, the tube shell 22 is formed by joining a pair of semi-cylindrical plate members that are divided in the lateral direction. The projecting portion 24 projects outward from the joining portion of the plate materials. As described above, even if the tube shell 22 having the middle structure is adopted, the above-described effects can be obtained. Further, since the tube 13 has the middle structure, it can be formed by laminating the semi-cylindrical plate material and the inner fin 23, and the tube 13 is easily processed because it is not bent and processed.

FIG. 5 is a diagram showing modified examples 3 and 4.
(A) in the figure shows a third modification. Here, a tube shell 22 is formed by joining a pair of semi-cylindrical plate members that are divided in the lateral direction, and a projecting portion 24 is integrally formed at an end of one plate member that constitutes the tube shell 22. .. As described above, even if the protruding portion 24 is integrally formed with the tube shell 22, the above-described effects can be obtained. Further, since the tube 13 has the middle structure, it can be formed by laminating the semi-cylindrical plate material and the inner fin 23, and the tube 13 is easily processed because it is not bent and processed.
(B) in the figure shows a modified example 4. Here, the protruding portion 24 is formed separately from the inner fin 23 and the tube shell 22, and is fixed to the tube shell 22. As described above, even if the protruding portion 24 is formed by a completely different member, the above-described operational effects can be obtained. Further, since the protruding portion 24 can be provided as necessary, the protruding portion can be arbitrarily changed even in a limited space.
Modifications 1 to 4 may be combined arbitrarily.

Although the above description has been made with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

11... Heat exchanger, 12... Header, 13... Tube (piping member), 14... Fin (plate member), 15... Inflow port, 16... Discharge port, 17... Partition wall, 21... Ventilation path, 22... Tube shell ( Outer shell portion, 23... Inner fin (inner shell portion), 24... Projection portion, 25... Flow path

Claims (5)

The directions orthogonal to each other are the first direction, the second direction, and the third direction,
A plurality of piping members that extend in the first direction, are provided at intervals in the second direction, and have a heat medium flowing therein.
Fixed between adjacent pipe members, a plate member for partitioning the ventilation path provided between adjacent pipe members along the first direction into a plurality of sections,
Heat exchange between the heat medium flowing inside the pipe member and air flowing around the pipe member and around the plate member,
The piping member is
With an outer hollow part,
An inner shell portion that is fixed inside the outer shell portion and divides the flow path along which the heat medium flows along the third direction into a plurality of sections.
A heat exchanger comprising: a protrusion that protrudes further to the windward side than the outer portion along the third direction. The heat exchanger according to claim 1, wherein the protruding portion is integrally formed with an end portion of the outer shell portion. The outer shell portion is formed of a pair or one plate member, and the joint portion of the outer shell portion is provided on the windward side,
The heat exchanger according to claim 1 or 2, wherein the protruding portion is integrally formed with the inner shell portion and protrudes to the windward side from the joint portion. The said protrusion part is formed separately from both the said outer shell part and the said inner shell part, and is fixed to the edge part of the said outer shell part, The any one of Claims 1-3 characterized by the above-mentioned. Heat exchanger. The said 1st direction is a vertical direction, The heat exchanger as described in any one of Claims 1-4 characterized by the above-mentioned.

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