JP2872314B2 - Heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat exchanger used for a condenser of a car air conditioner or a room air conditioner, for example.

2. Description of the Related Art Conventionally, as this type of heat exchanger, for example, Japanese Patent Application Laid-Open No. 63-3446
As shown in No. 6, a plurality of flat tubes and corrugated fins are alternately laminated, and both ends of each tube are connected to a pair of left and right cylindrical hollow headers, and a heat exchange medium flows through each tube. As shown in Japanese Unexamined Patent Publication No. Hei 1-20705, a plurality of flat tubes are bent in a meandering shape, and the corresponding ends of the tubes communicate with each other. Heat exchangers are known which are connected and have fins arranged between the parallel parts of the tubes.

By the way, in this type of heat exchanger, a forced air cooling fan is mounted at a position adjacent to the heat exchanger, and by driving the fan, a forced air cooling fan is forcibly applied to a core portion composed of tubes and fins of the heat exchanger. The air is circulated through the air to promote heat exchange. However, in order to improve the heat exchange efficiency, it is desirable to mount the fan as close to the core of the heat exchanger as possible.

However, since the fan body has a predetermined thickness, such a fan can be used only when a certain gap is formed between the core portion of the heat exchanger and the blades of the fan. Cannot be mounted. Therefore, even when the fan is driven, a part of the forced air flow leaks to the side through the gap between the fan and the core portion, thereby lowering the heat exchange efficiency. Furthermore, since the fan is mounted in such a state, it becomes bulky, so that it is necessary to increase the installation space in an engine room in which the fan is mounted. It was also a result contrary to. Further, in many cases, the electric wires of the fan must be routed while bypassing the core of the heat exchanger, which not only requires long electric wires, but also has a difficulty in handling the wires. .

The present invention has been made in view of the above-described problems, and has as its object to provide a heat exchanger capable of mounting a fan in a state in which a gap between the fan and the heat exchanger is reduced. It is assumed that.

Means for Solving the Problems According to the present invention, a fan main body insertion hole is formed in a central portion of a core portion composed of a flat tube and fins.

That is, the present invention provides a heat exchanger having a core portion in which flat tubes and fins are alternately stacked, wherein the size of the core portion of the core portion is such that the fan main body of the electric fan for forced air cooling can be fitted. The gist of the present invention is to provide a heat exchanger characterized in that the tube and the fin are omitted to form a fan body insertion hole surrounded by the tube and the fin.

When applied to a so-called header type heat exchanger, that is, a heat exchanger in which a plurality of flat tubes are arranged in parallel and both ends of these tubes are connected to the left and right headers, A plurality of straight tubular flat tubes are respectively arranged in parallel between the upper and lower ends except for the longitudinal middle part of both headers, and both ends of these tubes are connected to the headers respectively, while the left and right sides are connected. A flat tube bent in a meandering shape may be disposed on each of the left and right sides between the middle portions in the longitudinal direction of both headers, and both ends of these tubes may be connected to the headers.

On the other hand, a so-called serpentine type heat exchanger, that is, a heat base in which a flat tube is bent in a meandering shape, has a meandering tube on both the left and right sides of the core so as to avoid the central portion of the core. What is necessary is just to bend in a shape.

The fan main body insertion hole is formed in the center of the core as described above. In this specification, “formed in the center” means that the center of the hole is the geometric shape of the core. The term is used to include not only a case where the target is completely aligned with the target center position but also a case where the target is slightly shifted in the vertical direction or the horizontal direction.

As the tube, an extruded porous flat tube made of aluminum is preferably used. However, the present invention is not limited to this. For example, a tube in which inner fins are inserted and integrated into an electric resistance flat tube may be used.

In addition, as a header in the header type heat exchanger, a single-sided or double-sided brazing sheet obtained by bending a single-sided or double-sided brazing sheet into a tubular shape for the purpose of enabling brazing with a tube is preferably used, but is not limited thereto. Instead, for example, an aluminum hollow extrusion having a circular cross section may be used.

The fan is fitted in a state where the fan body is fitted into the fan body fitting hole formed in the central portion of the core. With this mounting, the gap between the core portion and the blades of the fan is reduced, so that the airflow leaking laterally from the gap is reduced, and most of the forced airflow from the fan passes through the core portion. Therefore, the heat exchange efficiency is improved. Further, since the fan main body is mounted in a compact state penetrating the core portion, the installation space such as an engine room in which the fan main body is mounted is small. Furthermore, if the electric wire of the fan is inserted through the hole for inserting the fan body, the wiring can be performed without bypassing the core portion.

Embodiment Hereinafter, the present invention will be described based on an embodiment applied to a condenser for a car air conditioner.

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

FIG. 1 shows a so-called header type condenser. In the same figure, (1) and (2) denote hollow headers made of aluminum having a circular cross section arranged in parallel to the left and right. Are closed by lids (3), respectively, and a refrigerant inlet pipe (4) is mounted outside the upper end of the right header (2), and an outlet pipe (5) is mounted outside the lower end.

The above-mentioned headers (1) and (2) are formed by bending a double-sided or single-sided phrasing sheet into a tubular shape and joining the opposite edge portions together to enable batch brazing with the tube (6). Can be preferably used, but a hollow extrusion material may be used.

The tube (6) is made of a porous flat extrusion die made of aluminum. However, an electric resistance welded tube in which inner fins are loaded may be used regardless of the extruded material.

Middle part (1b) in the longitudinal direction of both headers (1) and (2)
A plurality of straight tubular flat tubes (6) are arranged in parallel at predetermined intervals between the upper ends (1a) and (2a) and between the lower ends (1c) and (2c) except for (2b). And both ends of these tubes (6) are both headers (1)
It is connected to (2). On the other hand, between the middle portions (1b) and (2b) of the two headers (1) and (2), each of the left and right sides is bent in a meandering shape so as to avoid the center portion in the left and right direction. One flat tube (6)
(6) is provided, and each of these tubes (6) (6)
Are connected to the headers (1) and (2). An aluminum corrugated fin (7) is interposed between the tubes (6), and is integrated by brazing. As the corrugated fin (7), it is preferable to use a corrugated fin cut out of a louver.

Thus, a fan body fitting hole (B) large enough to fit the fan body of the electric fan for forced air cooling into the center portion of the core part (A) composed of the tube (6) and the fin (7). ) Is formed.

Partition plates (8) and (8) are provided in the right header (2) at positions slightly above the lower end and slightly above the upper end of the right serpentine tube (6), respectively. Is provided with a partition plate (8) at a lower position of the upper end connecting portion of the left-side meandering tube (6), so that the refrigerant flowing from the inlet pipe (4), as shown in FIG. ) In a meandering manner, while being condensed and flowing out of the outlet pipe (5).

A fan mounting plate (9), which is slightly larger than the hole (B), is brazed and fixed to the fan body insertion hole (B) so as to cover the hole. The mounting plate (9) has a fan body mounting hole (9a) at the center thereof and a plurality of fixing bolt holes (9b) formed around the hole. As the mounting plate (9), a brazing sheet having a brazing material layer formed on the surface thereof is preferably used for the purpose of facilitating the brazing material to the core portion (A). Thus, the fan can be mounted by fitting the fan body into the fan mounting hole (9a) of the mounting plate (9),
This is performed by inserting a fixing bolt into the bolt hole (9b) and fastening and fixing the bolt. However, as described above, the fan may be mounted using other mounting means without necessarily using the mounting plate.

On the other hand, FIG. 3 shows a so-called serpentine type condenser according to another embodiment, in which (14) is an inlet pipe, (15) is an outlet pipe, and (16) and (16) are meandering. (17) are corrugated fins interposed between adjacent parallel portions of each tube. Thus, two tubes (16) (16) bent in a meandering shape are arranged vertically and each tube (1
6) The corresponding ends of (16) are connected to each other through an inlet pipe (14) and an outlet pipe (15), and two refrigerants flowing from the inlet pipe (14) pass through the inlet pipe (14). The tube of (16)
The refrigerant is diverted to (16), passes through the tubes (16), (16), and the refrigerant joins at the outlet pipe (15) and flows out to the outside. ) And fins (17) so as to avoid the central part of the core (A), so that tubes (16) (16)
Are bent in a meandering shape, so that a fan main body insertion hole (B) large enough to fit the fan main body of the forced air cooling electric fan is formed in the center of the core part (A). The tubes (16) and the fins (17) are the same as in the previous embodiment. Also, the point that a fan mounting plate is attached to the fan main body insertion hole (B) and the fan is attached thereto is completely the same as in the above-described embodiment, and the description thereof will be omitted.

Effect of the Invention As described above, the heat exchanger according to the present invention has a structure in which the tube and the fin are cut off in the central portion of the core portion in a size that can fit the fan body of the electric fan for forced air cooling, so that the periphery is reduced. Since the fan main body insertion hole portion surrounded by the tube and the fin is formed, the gap between the fan blades and the core portion can be set small by mounting the fan main body in this hole portion in a fitted state. . Therefore, the heat exchange efficiency can be improved by reducing the flow of air forced to flow by the fan through the core and leaking to the side from the gap. In addition, since the fan body is mounted so as to penetrate the core, the installation space in an engine room or the like in which the fan body is mounted can be reduced, thereby satisfying the demand for a compact heat exchanger of this type. Can be.

Further, by inserting the electric wire of the fan into the hole for inserting the fan body, the electric wire can be wired without bypassing the core portion, so that the handling can be easily performed.

In addition, in any of the header type and the serpentine type heat exchangers as described in claims (2) and (3), the fan body can be fitted simply by bending a part of the flat tube in a meandering shape. Since the insertion hole can be formed, it can be easily manufactured.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall front view of a header type condenser, FIG. 2 is an explanatory view showing a refrigerant flow of the condenser shown in FIG. 1, and FIG. FIG. 1 is a general front view of a serpentine type condenser, showing an embodiment of the present invention. (1) (2) ... header, (1a) (2a) ... top end of header, (1b) (2b) ... middle part, (1c) (2c) ...
... the lower end, (6) (16) ... flat tube, (7)
(17) ... Fin, (A) ... core part, (B) ... fan body fitting hole.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 39/04 B60H 1/00 102

Claims (3)

(57) [Claims] 1. A mature exchanger having a core portion in which flat tubes and fins are alternately stacked, wherein said tube is large enough to fit a fan body of an electric fan for forced air cooling into a central portion of said core portion. And a fin is formed to form a fan body insertion hole surrounded by the tube and the fin. 2. Headers are arranged in parallel on the left and right, and a plurality of straight tubular flat tubes are respectively arranged in parallel between upper and lower ends of the two headers except for an intermediate portion in the longitudinal direction. While both ends of these tubes are respectively connected to the two headers, flat tubes bent in a meandering shape are disposed on both right and left sides between the middle portions of the two headers, respectively. The fan body of the forced air-cooling electric fan is fitted into the central portion of the core portion composed of the fins and the tubes by being connected to the two headers and having the fins interposed between the adjacent tubes. The tube and the fin are formed in a size that is large enough to form a fan body insertion hole which is surrounded by the tube and the fin. Heat exchanger according to claim. 3. A plurality of flat tubes are bent in a meandering shape, and corresponding ends of the tubes are connected to each other through an inlet tube and an outlet tube, and are parallel to adjacent tubes. A heat exchanger in which fins are interposed between parts, and tubes are bent in a meandering shape on both left and right sides so as to avoid the central part of the core part composed of tubes and fins Thereby, the central portion of the core portion is formed with a fan main body insertion hole in which the tube and the fin are missing and the circumference thereof is surrounded by the tube and the fin in such a size that the fan main body of the forced air cooling electric fan can be inserted. A heat exchanger characterized by being performed.