JP3273845B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for a condenser for a car cooler or a room cooler, for example, and a multi-flow path type in which a heat exchange medium flows in a meandering manner in a core portion. Heat exchanger.

[0002]

2. Description of the Related Art For example, in a heat exchanger used for a condenser for a car air conditioner, a porous flat extruded tube called a harmonica tube is bent in a meandering shape, and fins are arranged between parallel portions. Instead of the so-called serpentine type, which constitutes a core, a plurality of flat tubes and corrugated fins are laminated alternately, and both ends of each tube are connected to a cylindrical hollow header. In such multi-flow type heat exchangers that are offered and are in the limelight,
The one in which a partition plate is arranged in the header so that the refrigerant circulates in a meandering manner in a core portion composed of all tubes has become widespread. As described above, in the heat exchanger in which the refrigerant flows in a meandering manner, the first path formed by the tube group through which the refrigerant first flows is located at the uppermost position of the core portion, and the second path through which the refrigerant flows thereafter. By sequentially positioning subsequent passes such as the third pass below,
The refrigerant was circulated in a meandering manner from top to bottom.

[0003]

However, when such a heat exchanger is mounted, for example, in a front grill of an automobile,
Depending on the shape of the front grille and the vehicle, the air does not uniformly hit the core of the heat exchanger, and often tends to concentrate on the center of the heat exchanger. The part of the air that is to be heat-exchanged is the second pass or the third pass.
It was often the pass after the pass and not the first pass through which the heat exchange medium having the largest temperature difference with the air circulated.

As described above, in the heat exchanger, air to be heat-exchanged often flows through the core in a state where the air to be heat-exchanged is unevenly distributed in the center of the core when the heat exchanger is actually mounted, and its performance can be maximized. There was nothing.

The present invention has been made in view of the above-mentioned problems, and provides a heat exchanger that can exhibit the maximum performance when actually mounted on a mounting side of an automobile or the like. The purpose is to do.

[0006]

According to the present invention, the first path through which the refrigerant having the largest temperature difference from the air to be heat-exchanged circulates is provided at the middle in the vertical direction of the core portion constituted by all the tubes. It is located on the part.

That is, according to the present invention, a plurality of tubes (1) are arranged in parallel with each other, and a pair of hollow headers (3) and (4) are connected to both ends of each tube (1). wherein by each header (3) that (4) the is partitioned vertically by a partition member (9), cold
A medium is formed by all the tubes (1) while changing the flow direction for each path (A), (B), and (C) formed by each tube group defined by the partition member (9). In a heat exchanger for a condenser arranged to meander in the section (X), a first path (A) constituted by a group of tubes into which a refrigerant first flows is formed above and below the core section (X). Is located in the middle of the direction ,
The refrigerant after the first pass (A) has passed through the second
(B) is provided above the first pass (A),
Next, the third pass through which the refrigerant from the second pass (B) flows
(C) is provided below the first path (A).
And a heat exchanger characterized by the following.

[0008]

The refrigerant first flows through a first path formed by a tube group located at a vertically intermediate portion of the core portion among the tube groups partitioned by the partition member. Near the first path, the largest amount of air hits, and the refrigerant having the largest temperature difference from the air flows through this path.
Moreover, the refrigerant flowing through the first pass sequentially changes its flow direction.
In other words, first, the second pass above the first pass, and then the first pass
It is sequentially circulated to the third pass below the pass. Because of this,
The refrigerant in the header is often mixed
Is Therefore, together with the above , the performance of the heat exchanger is maximized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment applied to an aluminum heat exchanger for a condenser.

In this specification, the term aluminum is used to include an aluminum alloy.

In FIG. 1, (H) is a heat exchanger main body, which is composed of a plurality of aluminum tubes (1) arranged vertically in a horizontal state, and adjacent tubes (1) (1). ) And an aluminum corrugated fin (2) interposed therebetween.

The tube (1) is made of a porous flat extruded material made of aluminum. However,
A flat ERW tube having an inner fin inserted and fixed therein may be used.

The corrugated fin (2) has substantially the same width as the tube (1) and is joined to the tube (1) by brazing. For the purpose of facilitating brazing to the tube (1), it is preferable to use a brazing sheet formed by coating a brazing material layer on one or both surfaces of a core material. Preferably, a louver (2a) cut and raised is used.

(3) and (4) are left and right hollow headers having a circular cross section, each of which is formed of one aluminum pipe material having a circular cross section. Each hollow header (3) (4) has a tube insertion hole (3a) (4a)
Are bored, both ends of each tube (1) are inserted into the insertion holes, and are firmly connected in a liquid-tight state by brazing. In order to facilitate the brazing of the headers (3) and (4) to the tube (1), a brazing sheet in which a brazing material layer is formed on one or both sides of a core material as a header is formed into a tubular shape. A hollow molded pipe brazed with its butted edges is preferably used.

(5) and (6) are outermost tubes (1)
It is an aluminum side plate arranged outside the corrugated fin (2) arranged outside. As shown in FIG. 5, the side plates (5) and (6) have rising edges (5a) and (5a) on both side edges in the width direction, and holes (5b) formed in the edges. The bracket (not shown) can be attached to the mounting side of the vehicle body or the like. Further, at both ends in the length direction of the plates (5) and (6), there are rising edge portions (5c) and (5c) formed in a shape conforming to the outer peripheral shape of the header.
As shown in FIG. 5 and FIG. 6, the rising edge is in contact with the outer peripheral surface of each of the headers (3) and (4), and a ring member (7) of a corresponding shape is externally fitted from above the header. Fitted and brazed integrated. By using an aluminum brazing sheet, the ring member (7) can be conveniently brazed together with other heat exchanger components, which is convenient. Thus, the rising edge (5c) of the side plate (5) (6)
The side plates (5) and (6) can be temporarily fixed without using a jig by fitting the ring member (7) outside with the (5c) in contact with the headers (3) and (4). Productivity can be improved. In addition, since the side plates (5) and (6) and the headers (3) and (4) are integrated by brazing, the mounting strength of the side plates (5) and (6) is improved, and the brackets are attached to the plates. There is an advantage that the strength can be improved even when attached to a vehicle body or the like.

At the upper and lower ends of the headers (3) and (4), aluminum cap-shaped lids (8) and (8) for closing the header ends are provided as shown in FIGS. The ring members (7) and (7) are externally fitted from above and below and are integrated by brazing.

Below the left header (3), a partition member (9) for partitioning the inside of the left header (3) up and down is arranged, and on the right header (4), a partition member (9) in the left header (3). The partition member (9) is arranged at the same height position as the above, and the partition member (9) is also arranged above the partition member (9). Each of the partition members (9) and (9) arranged in the right header (4) has a pipe insertion hole (9a) (9a) formed at the center thereof. A pipe (10) is inserted through its upper and lower ends in a liquid-tight manner.

The refrigerant inlet pipe (1) is located outside the middle portion of the upper and lower partition members (9) of the right header (4).
1) is connected in communication. As shown in FIG. 1, the inlet pipe (11) is made of an aluminum union with a flexible snake, and its base end is integrated with the header (4) by brazing. By adopting such an inlet pipe (11), its direction can be freely set even after brazing, so that there is an advantage that the flexibility of piping can be improved. Of course, it can also be used for the refrigerant outlet pipe.

On the other hand, the partition member (9) of the left header (3)
The base end of the refrigerant outlet pipe (12) is connected to the outside of the lower position. The outlet pipe (12) is bent so that its middle part is along the header (3). A header (3) on which the intermediate curved portion (12a) is arranged side by side
As shown in FIG. 7, a bent portion is formed at the corresponding portion, and the intermediate bent portion (12a) is fitted in the recessed portion (3a) in a state where the intermediate bent portion (12a) is fitted. It is integrated. By arranging the refrigerant outlet pipe (12) along the recess (3a) of the header (3) in this manner, there is an advantage that the positioning of the outlet pipe (12) can be performed easily. Furthermore, since the contact surface between them becomes large, brazing can be easily performed and the strength after brazing is improved, so that it is not necessary to separately attach a fixing member such as a clamp.

As shown in FIG. 4, the refrigerant flowing from the refrigerant inlet pipe (11) into the right header (4) is connected to a section surrounded by upper and lower partition members (9) and (9). The first path (A) constituted by the group of tubes thus circulated flows to the left and flows into the left header (3). Then, the refrigerant flows to the right through the second path (B) formed by a tube group connected to the upper part of the header (3) and flows into the upper part of the right header (4). The refrigerant flows down the refrigerant distribution pipe (10) disposed so as to penetrate the upper and lower partition members (9) and (9), and reaches the lower part of the right header (4). Then, the refrigerant flows through the third path (C) constituted by the tube group located at the lowermost side to the left side, reaches the lower end of the left header, and reaches the outlet pipe (12).
From the outside. During this time, the refrigerant exchanges heat with the air flowing through the air flow gap including the corrugated fins (2) formed between the tubes (1), and condenses.

As described above, first, the refrigerant flows through the first path constituted by the tube group located at the vertically intermediate portion of the core portion (X) among the tube group partitioned by the partition member. In the vicinity of the first pass, the most air is applied, and the refrigerant having the largest temperature difference with the air flows through the pass, so that the performance as the condenser is maximized. Will be done.

As shown in FIG. 4, it is desirable that the passage cross-sectional area of each path constituted by each of the tube groups is set so as to gradually decrease.

FIG. 8 shows a right header (4
0), and has a partition wall (40a) along the longitudinal direction inside. The partition wall divides the inside of the header into a compartment (40b) on the tube side and a compartment (40c) on the opposite side. The interior of the tube-side compartment (40b) is vertically partitioned by upper and lower partition members (9), (9), and the tube ends are connected to each other so as to face the intermediate compartment. Tube ends are connected to the upper and lower portions of the partition walls (9) and (9), respectively, in such a manner that the tube ends pass through the partition walls (40a) and (40a) and face the outer compartment (40c). .
The refrigerant inlet pipe (1) is provided in a section surrounded by the upper and lower partition members (9) and (9) in the tube side compartment (40b).
1) is connected in communication. The right header (4) is made of an extruded aluminum material.

The right header (4), like the right header (4) according to the above-described embodiment, receives the refrigerant flowing from the refrigerant inlet pipe (11) into the right header (40).
First path (A) constituted by a group of tubes connected to a compartment surrounded by upper and lower partition members (9) and (9)
To the left side and into the left side header (3). Thereafter, a second path (B) constituted by a group of tubes connected to the upper part of the header (3) is circulated to the right side, and the upper outer compartment (4) of the right header (40) is circulated.
0c). The refrigerant is supplied to the compartment (40
c) flows down to the lower part of the right header (40). Then, the refrigerant flows through the third path (C) constituted by the tube group located at the lowermost side to the left side, reaches the lower end of the left header, and flows out of the outlet pipe (12) to the outside.

Therefore, even when the right header (40) according to this modified example is used, first, the refrigerant flows through the first path constituted by the tube group located at the middle part in the vertical direction of the core part. Thus, the performance as a condenser is maximized.

As described above, according to the present invention, the first path (A) constituted by the tube group into which the heat exchange medium first flows is formed in the middle in the vertical direction of the core portion (X) constituted by all the tubes (1). co When Ru made it shall be positioned in the parts
In addition, the refrigerant is guided to the upper second pass after the first pass (A), and then gradually to the lower third pass .

[0027]

The heat exchanger for a condenser according to the present invention comprises:
As described above, the refrigerant in the heat exchanger adapted to flow through the core portion in a meandering shape while converting flow direction in each pass, which is composed of the tube group, the group of tubes which refrigerant first flows The first pass that is configured is
It is located at a vertically intermediate portion of the core portion. Therefore, in the vertically intermediate portion of the core portion most air strikes in a state that actually allowed equipped to the mounting side of the vehicle body such as, the temperature difference between the air to be heat exchanged greatest refrigerant is first inflow Therefore , efficient heat exchange is performed in the first pass .

Moreover, the refrigerant flowing through the first pass is
To move to the second pass provided above the first pass.
So during this transition, it was blown up in the header enough
After mixing, a uniform gas-liquid mixture is established and the second pass
Is introduced to Therefore, efficient condensation even in the second pass
The action is realized.

In the second pass, the condensation and liquefaction progress to a considerable extent.
Refrigerant then moves to the third pass below the first pass.
As a result, the above-mentioned transfer of the refrigerant in the header by the action of gravity
It is performed smoothly, and the flow rate of the refrigerant in the third pass
The required supercooling can be reliably performed while maintaining the stability.

Therefore, the performance of the heat exchanger is maximized as a whole.
Exhibited to the limit.

[Brief description of the drawings]

FIG. 1 is an overall front view of a heat exchanger according to an embodiment.

FIG. 2 is a plan view of the heat exchanger.

FIG. 3 is a perspective view showing a header and a tube in a separated state.

FIG. 4 is a circuit diagram showing a refrigerant flow.

FIG. 5 is a perspective view of the vicinity of an upper portion of a left header with a lid and a ring member removed.

FIG. 6 is a vertical cross-sectional view near the upper part of a left header.

FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG. 1;

FIG. 8 is a side view showing the vicinity of an intermediate portion of the header.

FIG. 9 is a cross-sectional view showing a modification of the right header.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 3 Header 4 Header 9 Partition member A pass (1st pass) B pass (2nd pass) C pass (3rd pass) X Core part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 39/00-39/04 F28F 9/00-9/26

Claims (2)

(57) [Claims] 1. A plurality of tubes (1) are arranged in parallel with each other, and a pair of hollow headers (3) and (4) are communicatively connected to both ends of each tube (1). 3) By partitioning the inside of (4) in the vertical direction by the partition member (9), the refrigerant flows through the respective paths (A), (B), and (B) formed by the respective tube groups partitioned by the partition member (9). C) In the heat exchanger for the condenser , which flows in a meandering manner in the core portion (X) constituted by the entire tubes (1) while changing the flow direction every time, the refrigerant is cooled. first pass constituted by a tube group of first inflow (a) is made shall be positioned in the vertically intermediate portion of the core portion (X), the refrigerant after the first pass (a) distribution next circulation Second par
(B) is provided above the first pass (A), and then the third pass through which the refrigerant from the second pass (B) flows.
(C) is provided below the first path (A).
And a heat exchanger. 2. The first pass (A), the second pass (B) and the first pass (B).
The cross-sectional area of each passage of three passes (C) is gradually reduced.
The heat exchanger according to claim 1, which is set to: