JPS633191A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve the heat exchange efficiency of the heat exchanger by constituting a header and a tube of an aluminum hollow extrusion molded material, dividing a coolant passage into a front side path and a rear side path with respect to an air circulating direction and causing a coolant to flow in a direction opposite to the thickness direction of a core. CONSTITUTION:A gaseous coolant entering a front side passage 10a from a coolant inlet 7 at one end of a lower stage header 2 into a front side passage 10a within the header is distributed into a front side passage 13a of a tube 3 and rises up therein. Successively, the coolant enters a coolant passage 18 within an upper stage header 1 and makes detour around the lower part of the passage 18 and converts the direction by a locating and stirring plate 17. Thereafter, the coelant enters the rear side passage 13b of the tube 3 to flow down along the passage. Upon this time, the major part of the coolant is in a gas-liquid mixed state, and while falling down, the coolant is subjected to heat exchange with external air and is deprived of its quantity of heat retained. The coolant immediately assumes a low-temperature state and is collected at the rear side passage 10b of the lower stage header and discharged through an outlet 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to heat exchangers, in particular aluminum heat exchangers such as those used as condensers for car coolers.

BACKGROUND ART Heat exchangers such as those used as condensers for car coolers are required to have excellent pressure resistance from the viewpoint of safety, since relatively high pressure gas is used as a refrigerant.

For this reason, conventionally, a serpentine tube type heat exchanger is generally used. That is, a core is generally used by bending a multi-hole extruded flat tube called a harmonica tube into a serpentine shape and arranging fins between the parallel parts.

Problems to be Solved by the Invention However, in the above-mentioned heat exchanger, the refrigerant circuit is formed in a meandering manner from one end to the other end of a single tube, so the refrigerant flow is limited. The problem was that the resistance was relatively large. In order to reduce this flow resistance, it is natural to consider increasing the cross-sectional area of the tube, but since the size of the heat exchanger core is limited by its installation space, such countermeasures are not possible. It was difficult to apply. In addition, in the serpentine tube type heat exchanger, the refrigerant circuit is configured in a meandering manner from one end of the tube to the other as described above, so if we analyze it in detail, the part near the refrigerant inlet side and There is a large difference in heat exchange efficiency between the part near the outlet side, and there is also a difference in heat exchange efficiency in the width direction of the tube, that is, between the front part located on the inflow side of the air flow and the rear part located on the outflow side. However, it cannot be said that the entire area of the core is utilized effectively to the maximum extent for efficient heat exchange. Furthermore, in terms of manufacturing, not only is it somewhat difficult to bend the tube into a meandering shape, but also the assembly of the tube and fins is difficult because the meandering bending of the tube tends to expand when the fins are inserted. It is difficult to assemble by automatic mechanical assembly, which results in low productivity and high costs.

In view of the above-mentioned prior art, this invention provides a heat exchanger that has pressure resistance suitable for practical use as a condenser, reduces flow resistance, improves heat exchange efficiency, and enables automation of assembly and manufacturing. The purpose is to provide equipment.

Means for Solving the Problems In the present invention, both the header and the tubes are constructed of hollow extruded aluminum members, and the refrigerant passages in the tube group are arranged on the front side with respect to the flow direction of the air outside the system. The refrigerant is divided into a passageway and a passageway on the rear side, and the refrigerant is made to flow in opposite directions in the front and back inside each tube with respect to the seven thickness directions of the core.

More specifically, the heat exchanger according to the present invention includes a pair of headers made of hollow extruded material arranged in parallel, and a pair of headers made of hollow extruded material arranged in parallel between both headers, with both ends inserted into the header. The refrigerant inlet/outlet of both headers includes a large number of extruded tubes connected in communication with the refrigerant passage, and fins arranged in the air circulation gap between adjacent tubes and between the tubes at both ends and the side plate. One of the side headers is integrally provided with a central partition wall that bisects the internal refrigerant passage into a front passage and a rear passage along the length direction, and the tube also has an internal refrigerant passage. A central partition wall dividing the front passageway and the rear passageway shall be provided, and these partition walls shall be in contact with each other when the header and the tube are connected. The tubes are connected to each other in an independent state, and the front passage and the rear passage are communicated with each other via the refrigerant passage in the other header, so that the refrigerant flows through the tubes. The gist of the present invention is a heat exchanger characterized by having an inverted refrigerant circuit portion in which the refrigerant flows from the front passage to the rear passage.

EXAMPLES Below, the structure of the present invention will be further explained in detail based on illustrated examples.

Embodiment 1 A specific example of the most basic structure of a heat exchanger to which the present invention is applied is shown in FIGS. 1 to 5.

The heat exchanger of this embodiment is made of aluminum alloy, and its main components include a pair of upper and lower headers (1) and (2) arranged in parallel as shown in FIG. A large number of tubes (3) are arranged in parallel between them, and both ends are connected to the headers (1) and (2), respectively. ) and a corrugated fin (5) interposed in the air circulation space between the side plate (4) and the side plate (4).

The headers (1) and (2) are both made of circular pipe-shaped hollow extrusions made of aluminum material, and the upper header (1) has a lower end at the upper center of the inner surface, as shown in Figure 2. A positioning/disturbing plate (17) that reaches approximately the center point is integrally molded in a hanging shape, and both ends are closed with cover pieces (6) (6) to form a single refrigerant passage (18) as a sealed space inside. It is said that it was formed by −
On the other hand, the lower header (2) has refrigerant inlets (7) at both ends.
) is formed at the same outlet (8), and a vertically oriented partition wall (9) is vertically installed in the center of the interior, thereby dividing the internal refrigerant passage (10) into two along the length direction. , and is partitioned into a front passage (10a) and a rear passage (10b). One end of the rear passage (fob) on the refrigerant inlet (7) side is closed by an insertion blocking plate (11) extending from the side plate (4), as shown in FIG. The refrigerant flowing in from the front passage (
10a) so that it can be introduced and hung only on the side. Moreover, on the contrary, the front passage (10a) has a refrigerant outlet (8).
One end of the side is blocked by the insertion blocking plate (11) of the side plate (4) in the same manner as described above, and the refrigerant outlet (8
) is opened only to the rear passage (10b).

The tube (3) is made of a flat hollow extruded member made of aluminum material, and also has a central partition wall (], '2) at the center in the width direction inside, and a lower header (2).
) The internal refrigerant passage (13) is divided into two parts: a front passage (13a) and a rear passage (13b).

This tube (3) may be of a porous type, so-called a harmonica tube. In this case, the front passage and the rear passage are each formed with a plurality of independent passage sections.

The communication connection between the header (1) (2) and the tube (3) is as follows:
As shown in Figure 3, a notch (14) corresponding to the tube width is formed in the tube attachment part of the header (1) (2), and the end of the tube (3) is tightly fitted into this, and the tube This is done by firmly joining the two using a zinc layer coated on the material in advance or a joining material such as a brazing filler metal that is separately attached. At the time of this joining, the tube (3) should have a pre-formed notch (15) in the center of its end to fit the positioning/disturbing plate (17) and bulkhead (9) of each header (1) (2). Therefore, the depth of engagement and relative position are regulated.

and the central partition wall (12) of the tube (3) in the connected state.
), especially when its lower end is the bulkhead (9) of the lower header (2).
The lower header (2) and each front passage (1) of the tube (3) are brought into close contact with each other.
0a) (13a) Doshi, and rear passage (10
b) (13b) It is assumed that both are connected to each independent state.

Therefore, the refrigerant circuit (C1) in this heat exchanger is the fifth
As shown in the figure, the front passage (10a) of the lower header (2)
) to the upper header (
1) in the refrigerant passage (18), and then the lower header (2
) to the refrigerant outlet (8) through the rear passage (10b).

The fins (5) are corrugated and have a height corresponding to the spacing between adjacent tubes (3) (3); - the tubes (3) and the side plates (
4).

The side plate (4) has a substantially U-shaped cross section as shown in FIG. 3, and is disposed between both ends of the headers (1) and (2) with its opening side facing outward. To install this side plate (4), connect the insertion parts (4a) (4b) extending from both ends of the side plate (4) to the header (4b).
This is done by inserting it into a slit (1B) made in the corresponding part of 1) and (2) and soldering as appropriate.

In the above, the refrigerant enters the front passage (lOa) in the lower header (2) from the refrigerant inlet (7) at the negative end of the header. Since the rear passageway (10b) is blocked on the inlet side by the insertion blocking plate (11) of the side plate (4) as described above, the gaseous refrigerant from the inlet (7) does not directly enter. The gaseous refrigerant entering the front passage (10a) of the lower header (2) is then distributed to the front passage (13a) of the tube (3) and rises therein. In this process, first of all, due to the external air flow flowing between the adjacent tubes (3) (3), the gaseous refrigerant has a large relative temperature difference with the air flow, resulting in efficient heat exchange throughout the entire core. will be held. The refrigerant then enters the refrigerant passage (18) in the upper header (1). At this point, due to the presence of the positioning/disturbing plate (17), the direction is changed by detouring below it as shown by the arrow in Figure 4, and then the tube (3
) and descend through the rear passage (13b). At this time, most of the refrigerant is already in a gas-liquid mixed state, and during this descent, it further exchanges heat with the outside air and loses its retained heat, and eventually reaches the required low temperature and moves to the lower header (2). gather at the rear passageway (10b), then at the exit (10b).
8).

Embodiment 2 This embodiment is shown in FIGS. 6 to 8.
Compared to the embodiments, this embodiment has specificity in the joint structure between the header and the tube and the circuit configuration of the refrigerant circuit.

Both the upper and lower headers (31) (32) of this example are as follows:
In both cases, refrigerant passages (35) (3) are defined by partition walls (33) (34) provided continuously in the length direction.
6) and tube fixing resin filling spaces (37) and (38). The tube (39) made of a porous flat extruded material has headers (31) at both ends.
(32) from its outer peripheral wall to the partition wall (33) (
The refrigerant passages (35) (3G
), and the resin-filled space (
37) Inside (38) is a tube fixing resin (40
) is injected and cured to form an inseparable and airtight connection between the header (31) (32) and the tube (39). However, in order to ensure sufficient bonding strength, a recess (43) is formed on the outer surface of the end of the tube (39), and the resin (40) bites into the recess (43).
9) is made to be more securely prevented from coming off. The above resin (40) is injected into the header (31)
Injection holes (44) (
(Fig. 6). Further, as the resin (40) to be used, any resin can be used as long as it exhibits sufficient bonding force between the header (31), (32) and the tube (39), or has good injection workability. However, epoxy resin is particularly preferred.

Further, the refrigerant passage (36) of the lower header (32) is further divided into two by a partition wall (30) into a front passage (36a) and a rear passage (38b).

The refrigerant passage (41) in the tube (39) is connected to the partition wall (30) into the front passage (41a) and the rear passage (4).
The lower end surfaces of the central partition wall (42), which is divided into two parts (1b) and 1b), are in close contact with each other, so that the front passages (38a) and (41a) of the lower header (32) and the tube (39), and the same rear passage 38b') (41b
) are assumed to be interconnected in each independent state.

Furthermore, in the refrigerant passages (35) (3B) of the upper and lower headers (31) (32), there are passage blocking plates (45) that block the passages at corresponding positions, as shown in FIG. (4B), (47) and (48) are provided. That is, the upper header (31) has semicircular blocking plates (
45) (47) is provided on two sides, and the lower header (3
On the 2) side, at positions corresponding to the blocking plates (45) and (47), there is a first blocking plate (4B) that blocks the front passage (36a), and a second blocking plate (4B) that blocks the rear passage (38b). A blocking plate (48) is provided. Therefore, such a blocking plate (45) (4[i) (4
7) With the installation of (4g), the refrigerant circuit (C2) of the heat exchanger core is connected to the inlet (C2) as shown in Figures 6 and 8.
7) to the front passage (36a) of the lower header (32)
, the front passage (41a) of the first tube group (1) on the inlet side
), upper header (31), first tube group (1
) rear passage (41b), lower header (32)
, the rear passage (41b) of the intermediate second tube group (n)
, the upper header (31), the front passage (4La) of the second tube group (n), the front passage (36a) of the lower header (32), the front passage (38a) of the third tube group (m) on the outlet side , the upper header (31), and the rear passageway (3Gb) of the third tube group in order to reach the outlet (8), which is substantially meandering.

The above blocking plates (45) (46) (47) (
48) is installed by making a cut in the header (31) (32) and fitting it into the cut,
Each bracket part (49) extends outward continuously (
50) (51) (52) is considered to have the - body. The bracket part (49) (50)
(51) and (52) have a mounting hole formed by bending the tip in an appropriate direction, and are used for mounting a heat exchanger.

Other configuration items are the same as in the first embodiment,
Corresponding parts are indicated by the same reference numerals and their explanation will be omitted.

In the heat exchanger of this embodiment, the refrigerant introduced from the inlet (7) is reversed and moved laterally in the upper and lower headers (31) and (32) as described above, and then passes through the front passage (41a) in the tube (39). ) and the rear passageway (41b) in order through the core through a meandering circuit (C2), during which it is cooled by heat exchange with external air flowing between adjacent tubes (39). It is sent out from the outlet (8) in a low temperature and highly liquefied state.

Embodiment 3 This embodiment is a modification of Embodiment 2 in which the shape of the header is changed, as shown in FIG. 9.

That is, the upper and lower headers (61) and (62) are both formed to have an elongated semicircular cross section with a part of the joining side of the tube (39) being flat, and this flat outer peripheral wall portion There are two internal partitions u (83) (
64) are provided in parallel to each other, and the resin filling space (85
) is divided into two parts.

Then, resin (40) is injected and filled into each of these areas independently, thereby forming both partition walls (63) (84).
The end of the tube (39) inserted through the tube is fixed. The rest is the same as in Example 2.

Effects of the Invention In the heat exchanger according to the present invention, a pair of headers constituting a refrigerant circuit and a tube between them are both constructed of hollow extruded aluminum members, and in addition, they connect the ends of the tubes to the header. By inserting it into the peripheral surface of the device, the device is connected in a communicating state.

Therefore, it has a pressure resistance comparable to that of conventional serpentine tube heat exchangers, making it suitable for use as a condenser for car coolers that handle relatively high-pressure gaseous refrigerants. Can be used.

In addition, a large number of tubes are provided in parallel between both headers, and the refrigerant is circulated through the front passage and the rear passage for all or a predetermined number of tube groups. The passage cross-sectional area of the refrigerant circuit can be expanded or contracted as desired in accordance with design requirements. Therefore, it is possible to sufficiently reduce the flow resistance of the refrigerant, and the pressure loss can be reduced compared to a conventional serpentine tube type condenser.

Further, in the heat exchanger of the present invention, the refrigerant passage in the tube is divided into a front passage and a rear passage, and the refrigerant is reversed from the front passage to the rear passage in at least a part of the core, and the refrigerant is transferred to each vehicle. The tube is made to pass twice in opposite directions. Therefore, after highly efficient heat exchange is performed on the windward side of the air flowing between adjacent tubes, that is, in the front portion of the tubes, heat exchange is performed separately and repeatedly in the rear portion. Therefore, in a comprehensive evaluation using all tubes, the heat exchange efficiency is averaged over the entire core, and the heat exchange efficiency of each tube section is also increased, greatly increasing the heat exchange efficiency as a whole. can. As a result, it is possible to downsize the heat exchanger.

Furthermore, since the heat exchanger of the present invention is assembled by arranging the side plates, tubes and fins between a pair of extruded headers, the headers, side plates and tubes provide a strong structure during assembly. The vines form the framework. Therefore, even if the fins are forcibly fitted into this framework, no significant change in shape occurs, and the temporarily assembled state of the constituent members can be stably maintained by themselves.

Consequently, it becomes possible to perform the assembly process mechanically, and it becomes possible to automate the manufacturing process of the heat exchanger and reduce costs.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, in which FIG. 1 is a front view of the entire heat exchanger, and FIG. 2 is a front view of the entire heat exchanger.
Figure 3 is a perspective view of the main parts with the constituent members separated, Figure 4 is a sectional view taken along line IV-IV in Figure 1, Figure 5 is the refrigerant circuit configuration. It is a diagram. 6 to 8 show a second embodiment of the present invention, in which FIG. 6 is a partially exploded perspective view of the entire heat exchanger, and FIG.
The figures are a cross-sectional view taken along the line ■--■ in FIG. 6, and FIG. 8 is a refrigerant circuit configuration diagram. FIG. 9 shows a third embodiment of the present invention, and is a sectional view of a portion corresponding to FIG. 7 of the second embodiment. (1) (31) (81)...Upper header, (2)(32) (82)...Lower header,
(3) (39)...tube, (4)...side plate, (5)...fin, (7)...refrigerant inlet, (8)...refrigerant outlet, (9)...・・Bulkhead, (10
) (3B)...Refrigerant passage, (10a) (3
[ia)-front passage, (10b'I (36b
)... Rear passage, (12) (42)... Central partition, (13) (41)... Refrigerant passage, (13a)
(41a)...Front passage, (13b) (4
1b)... Rear passage, (33) (34) (63
) ([i4)...Partition wall, (37) (3g)
(65) Resin filling space, (40) Resin, (45) (4B) (47) (48) Passage blocking plate, (CL) (C2) Refrigerant circuit. Written amendment to the above procedure Date: 1/1/1988 Commissioner of the Patent Office Black 1) Akio Yu Tono 2 Name of the invention Heat exchanger 3 Relationship with the person making the amendment Patent applicant address 6-224, Kaizan-cho, Sakai City Address Name Showa Aluminum Co., Ltd. Representative Ishi
Chika I 4, Agent address: 72-45 Unagidani Nakano-cho, Minami-ku, Osaka, Date of amendment order (voluntary amendment) 6. Number of inventions increased by amendment 8, Contents of amendment (1) Patent claim in the specification Correct the range as shown in the attached sheet. (2) "This invention...
``...'' is corrected to ``This invention is of a header type in which a number of tubes are arranged in parallel between a pair of headers.'' (3) Delete "Made from extruded material" in line 5 of page 6 of the same book. (4) Delete "and the tube between them" on page 18, line 10 of the same book. Claims (1) A pair of headers made of hollow extruded material arranged in parallel, and a pair of headers arranged in parallel between both headers, with both ends inserted into the header and connected to the refrigerant passage therein. It comprises a large number of tubes and fins arranged in the air circulation gap between adjacent tubes and between the tubes at both ends and the side plate, and inside one of the two headers on the refrigerant inlet/outlet side. A central partition wall is integrally provided that divides the refrigerant passage into a front passage and a rear passage along the length direction, and the tube also has a central partition wall that divides the refrigerant passage therein into two into a front passage and a rear passage. A central partition wall is provided, and when the header and the tube are connected, the partition walls are brought into contact with each other, so that the front passages and the rear passages of both the tubes are independently communicated with each other. The front passage and the rear passage are connected to each other through the refrigerant passage in the other header, so that the refrigerant flows from the front passage of the tube to the rear passage. A heat exchanger characterized by having a refrigerant circuit portion. (2) A partition wall partitioning the refrigerant passage and the resin filling space is continuously formed in the header along the length direction, and the end of the tube passes through the outer peripheral wall and the partition wall inside the header. 2. The heat exchanger according to claim 1, wherein the header and the tube are integrally joined and fixed by being inserted into the resin filling space and by injecting and filling the resin filling space with resin. (3) The heat exchanger according to claim 2, wherein the resin injected into the resin filling space is an epoxy resin. (4) By installing one or more passage blocking plates in the refrigerant passages of both headers, the refrigerant circuit in the core sequentially passes through the front passage and the rear passage several times in a substantially meandering manner. A heat exchanger according to any one of claims 1 to 3, which is formed by:

Claims (4)

[Claims] (1) A pair of hollow extruded headers arranged in parallel, and a large number of extruded members arranged in parallel between both headers, with both ends inserted into the header and connected to the internal refrigerant passages. and fins disposed in air circulation gaps between adjacent tubes and between the tubes at both ends and the side plates, and the refrigerant therein is disposed in one of the two headers on the refrigerant inlet/outlet side. A central partition wall that bisects the passage into a front passage and a rear passage along the length direction is integrally provided, and the tube also has a central partition wall that bisects the refrigerant passage therein into the front passage and the rear passage. A type in which a partition wall is provided, and when the header and the tube are connected, the partition wall is brought into contact with the header and the tube, so that the front passages and the rear passages of both are connected to each other independently. At the same time, the front passage and the rear passage are communicated with each other via the refrigerant passage in the other header, thereby creating an inverted refrigerant circuit in which the refrigerant reverses from the front passage of the tube and flows to the rear passage. A heat exchanger characterized in that it has a portion. (2) A partition wall partitioning the refrigerant passage and the resin filling space is continuously formed in the header along the length direction, and the end of the tube passes through the outer peripheral wall and the partition wall inside the header. 2. The heat exchanger according to claim 1, wherein the header and the tube are integrally joined and fixed by being inserted into the resin filling space and by injecting and filling the resin filling space with resin. (3) The heat exchanger according to claim 2, wherein the resin injected into the resin filling space is an epoxy resin. (4) By installing one or more passage blocking plates in each of the refrigerant passages of both headers, the refrigerant circuit in the core sequentially cycles through the front passage and the rear passage multiple times in a substantially meandering manner. A heat exchanger according to any one of claims 1 to 3, which is formed by: