JPH0552581U - Heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] A multi-flow heat exchanger in which headers (1) and (2) are arranged horizontally in the vertical direction and tubes (4) are arranged in the vertical direction, and the lower header (2 The purpose of the present invention is to provide a heat exchanger that prevents water droplets such as dew condensation water from accumulating in the tube connection portion (a) of (1) and is not corroded early. [Configuration] Lower header (2) of each tube (4) ) Install a drainage plate (8) in the vicinity. The plate (8) prevents water drops flowing from the upper part from flowing down to the tube connection portion (a) of the lower header (2).

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a heat exchanger used as, for example, an evaporator for a car air conditioner or a room air conditioner.

[0002]

[Prior Art]

 Conventionally, as a heat exchanger used in this type of evaporator, as shown in FIG. 7, a plurality of tubes (4) are stacked and arranged in the thickness direction with fins (3) interposed therebetween. At the same time, both ends of the tubular headers (1) and (2) are inserted into the tube insertion holes (1a) and (2a) arranged in line with the tubular headers (1) and (2), respectively, and are joined and integrated by brazing or the like. A multi-flow type is known.

When such a heat exchanger is used as an evaporator, condensed water adheres to its surface. For this reason, if the dew condensation water is not smoothly discharged to the outside of the heat exchanger, a so-called water splash phenomenon occurs in which water droplets scatter on the leeward side. As a method of avoiding such inconvenience, one header (1) is horizontally arranged at the upper position and the other header (2) is horizontally arranged at the lower position so that the dew condensation water is moved up and down. It is conceivable that the tubes (4) arranged along the direction are allowed to flow down.

[0004]

[Problems to be solved by the device]

 By the way, in this kind of multi-flow type heat exchanger, in order to improve the joint strength between the tube (4) and the headers (1) and (2), as shown in FIG. The inwardly projecting edges (1b) and (2b) are formed on the periphery of the tube insertion holes (1a) and (2a) of (2), and the tube ends are firmly attached to the edges (1b) and (2b). The tubes (4) and the headers (1) and (2) are joined and integrated in a state of being juxtaposed. Such joining and unification are preferably performed by brazing, and in order to ensure that brazing and joining can be performed, the tube insertion holes (1a) (2a) of the headers (1) and (2) are surely formed. ) Recessed brazing material reservoirs (1c) and (2c) are provided on the periphery so that the brazing material can flow into the brazing material reliably.

However, when the tube (4) is arranged vertically to improve the drainage property of the condensed water as described above, the water droplets flowing down along the tube (4) will fall on the lower header (2). There is a disadvantage that the joint portion (a) between the tube (4) and the lower header (2) is corroded early by accumulating in the reservoir portion (2c).

The present invention has been made in view of the above problems. Even in a multi-flow type heat exchanger in which tubes are arranged in an upper and lower direction, the tube connection portion of the lower header is connected to the heat exchanger. It is an object of the present invention to provide a heat exchanger in which the inconvenience of dew condensation water accumulating and corroding early is eliminated.

[0007]

[Means for Solving the Problems]

 In this invention, therefore, a drainage plate is provided in the vicinity of the lower header of each tube so that water drops flowing down from the upper portion of the tube can be drained without flowing down to the tube connection portion of the lower header. It is a thing.

That is, according to the present invention, a plurality of flat tubes, which are stacked in the left-right direction with fins interposed between them, communicate with the upper and lower ends of a pair of upper and lower cylindrical headers arranged horizontally. In the connected heat exchanger, the tubes are placed near the lower headers of the tubes in a liquid-tight manner at least on the left and right sides of the tubes and on the leeward side edges, and water drops such as dew condensation water flowing down from the upper part are removed. The gist of the heat exchanger is that it is equipped with a drainage plate that allows the water to drain to the outside of the heat exchanger without contacting the tube connection part of the side header.

As a drainage plate, for the purpose of facilitating attachment to the heat exchanger body, a tube fitting slit of a corresponding shape that can be fitted snugly from the side of each tube A fitting plate part that is lined up on the edge and a drainage plate part that extends from the other edge and is arranged on the side of the lower header are both bent in a V shape when viewed from the side. It is preferably used. If necessary, the fitting plate portion is joined and integrated with a tube by brazing or the like.

The drainage plate is made of a material having a sacrificial anticorrosion effect on the tube for the purpose of preventing early corrosion of the tube due to accumulation of water droplets at the contact portion between the plate and the tube. It is desirable to use one.

[0011]

[Action]

 Water droplets such as condensed water adhering to the tubes and fins are blown down to the leeward side edge of the fins and the tubes by the air flow passing through the core portion formed by the tubes and fins, and flow down along the tubes. At the position near the lower header of the tube, at least the left and right sides of the tube and the leeward side edge are equipped with a drainage plate arranged in a liquid-tight fit, so that condensation water etc. The water drops are drained to the outside of the heat exchanger by the plate without contacting the tube connection part of the lower header. Therefore, the water drop does not come into contact with or stay at the tube connection part of the lower header, and the early corrosion of the connection part is prevented in advance.

[0012]

【Example】

 Hereinafter, the present invention will be described based on illustrated embodiments in which it is applied to a car air conditioner evaporator.

In FIGS. 1 to 6, (A) is a heat exchanger body, and a pair of upper and lower cylindrical headers (1) and (2) arranged horizontally have a fin (3) interposed therebetween. The flat tubes (4) are stacked in the left-right direction and are connected to each other.

Each of the headers (1) and (2) is formed of an aluminum pipe material having a circular cross section. Each header (1) (2) is provided with a tube insertion hole (1a) (2a), and the corresponding end of each tube (4) is inserted into the hole (1a) (2a). It is firmly joined and connected in a liquid-tight state by brazing. Regarding such brazing, the headers (1) and (2) are formed by an electric resistance welded pipe made of a brazing sheet whose outer surface is covered with a brazing material layer, and the fins (3) are formed by a brazing sheet. (2), each tube (4), fins (3), and other components are temporarily assembled, then brought into a vacuum heating furnace, etc., and then integrally brazed together for production. It is desirable in terms of improving productivity.

The tube (4) is made of a flat extruded mold material made of an aluminum material. As the tube (4), a multi-hole type tube called a harmonica tube may be used.

The fins (3) are so-called corrugated fins bent in a meandering strip shape, and are joined to the tube (4) by brazing. The fins (3) are preferably cut and raised louvers. Aluminum side plates (9) and (10) are disposed on the outer side of the outermost fins (3) and are brazed integrally with the fins (3).

At the left end of the lower header (2), a heat exchange medium inlet pipe (5) is projected downward, and at the right end of the upper header (1) is a heat exchange medium outlet pipe (6). ) Are attached respectively. Further, a partition plate (7) is arranged inside the upper and lower headers (1) and (2) to partition the headers (1) and (2) in the longitudinal direction, and heat input from the heat exchange medium inlet pipe (5). The exchange medium flows in a zigzag manner through the heat exchange medium passage in the heat exchanger body (A), flows out from the heat exchange medium outlet pipe (6), and during this period, the fins formed between the tubes (4) ( It is supposed to evaporate by exchanging heat with the air flowing through the air circulation gap including 3). However, the partition plate (7) may not be provided, and the inlet / outlet pipes (5) and (6) may be attached to the end portions of the headers (1) and (2) so as to project laterally.

A drainage plate (8) is disposed so as to be inserted between the lower headers of the tubes (4), that is, between the lower header (2) and the lower edge of the fin (3). Has been done.

As shown in FIG. 1, this drainage plate (8) is made of an aluminum plate-like material that is set to be substantially the same as or slightly longer than the header (2), and its width. It is bent and formed in a substantially V shape in a side view at an intermediate portion in the direction. Then, one side edge side constitutes a fitting plate portion (8a) while the other side edge side constitutes a drainage plate portion (8b) with the bent portion as a boundary. As shown in FIG. 3, the fitting plate portion (8a) is provided with tube fitting slits (11) of a corresponding shape which can fit the tubes (4) properly from the side. ..

The drainage plate (8) is attached by inserting the fitting plate portion (8a) between the lower header (2) and the lower end edge of the fin (3) as shown in FIG. It is performed by fitting the tube (4) into the tube fitting slit (11). In this fitting arrangement, the fitting slit (11) is in liquid-tight contact with the left and right side surfaces of each tube (4) and the leeward side edges, and the fitting plate portion (8a) is a tube. It is arranged obliquely with respect to (4). In this way, the drainage plate (8) can be firmly fixed by fitting it into the tube (4), but if necessary, the plate (8) and the tube (4) can be further fixed. They may be joined and integrated by brazing or the like.

When the heat exchanger is operated as an evaporator, condensed water adheres to the tubes (4) and fins (3). This condensed water is blown to the leeward side edges of the fins (3) and the tubes (4) by the air flow passing through the core portion composed of the tubes (4) and the fins (3), and eventually the tubes (4). ) And flow down. However, since the drain plate (8) is provided near the lower header of the tube (4), as shown in FIG. Is discharged to the outside of the heat exchanger without coming into contact with the tube connection portion (a) of the lower header (2). Therefore, the condensed water does not come into contact with or stay in the tube connecting portion (a) of the lower header (2), and the early corrosion of the connecting portion (a) is prevented in advance.

As described above, the drain plate (8) drains the water flowing down from its upper portion to the outside without contacting the tube connecting portion (a) of the lower header (2). It is necessary that the tubes (4) are fitted and arranged in a liquid-tight contact state at least on the left and right side surfaces (4a) and the leeward side edges (4b) of the tubes (4) near the lower headers. Therefore, as long as these conditions are satisfied, the fitting plate portion (8a) is provided with the tube insertion holes corresponding to the respective tubes (4), and the tube (around the entire circumference of the insertion hole). 4) may be inserted and arranged in a liquid-tight contact state.

If the drain plate (8) is simply fitted and arranged as described above, it is considered that water may accumulate at the contact portion with the tube (4). It is desirable to use a material made of a material having a sacrificial anticorrosion effect on the tube (4). However, in addition to or instead of such anticorrosion measures, the joint portion between the drainage plate (8) and the tube (4) may be waterproofed.

Even if the drainage plate (8) is installed as described above, some dew condensation is caused on the header vicinity portion of the tube (4) located below the plate (8) and the lower header (2) itself. Is generated, and in this sense, it is impossible to completely eliminate the adhesion of water at the connection portion between the tube (4) and the lower header (2). For this reason, in this embodiment, as shown in FIGS. 5 and 6, a sealing material (12) such as a resin is applied to the connecting portion for a more reliable anticorrosion treatment.

In the above embodiment, as the drainage plate (8), the fitting plate portion (8a) fitted and arranged in the tube (4) and the drainage plate portion (8b) extended from one side edge thereof. ) And a substantially V-shape in side view, the present invention is not limited to this, and a pair of front and rear members extending in opposite directions from the fitting plate portion and both side edges thereof are shown. It is also permissible to use a drainage plate or the like having a drainage plate part of the above.

Further, the present invention is not limited to the evaporator for a car air conditioner as shown in the above-mentioned embodiment, and in addition, water droplets may be attached from the outside depending on the installation location such as a radiator for an automobile. However, it also applies to heat exchangers in which the water droplets cause corrosion of the joint between the tube and the lower header.

[0027]

[Effect of the device]

 As described above, the heat exchanger according to the present invention has a plurality of flat tubes, which are vertically stacked on a pair of upper and lower cylindrical headers arranged horizontally, with fins interposed therebetween. Despite being a type in which both ends are connected in communication, they are fitted in a liquid-tight contact state at least on the left and right side surfaces and the leeward side edges of the tubes near the lower headers, and flow down from the upper part. Since it is equipped with a drainage plate that allows water droplets such as dew condensation water to be drained to the outside of the heat exchanger without contacting the tube connection part of the lower header, The plate drains the heat to the outside of the heat exchanger without contacting the tube connection of the lower header. Therefore, water drops do not come into contact with or accumulate in the tube connection part of the lower header, and premature corrosion of the connection part due to contact or retention of such water drops is prevented beforehand, and it has excellent durability. Can be

Further, since the drainage plate is fitted and arranged in the conventionally known heat exchanger body, it is possible to improve the corrosion resistance of the heat exchanger body without complicating the special structure. You can

[Brief description of drawings]

FIG. 1 is an overall front view of a heat exchanger according to the present invention.

FIG. 2 is a right side view of the heat exchanger.

FIG. 3 is an enlarged perspective view of an essential part showing a state in which a drainage plate and a heat exchanger body are separated.

FIG. 4 is an enlarged perspective view of an essential part showing a state in which the drainage plate is attached to the heat exchanger body.

5 is an enlarged cross-sectional view taken along line VV of FIG.

6 is an enlarged sectional view taken along line VI-VI in FIG.

FIG. 7 is an overall front view of a conventional heat exchanger.

FIG. 8 is an enlarged cross-sectional view corresponding to FIG. 6, showing a connecting portion between a tube and a lower header of the heat exchanger.

[Explanation of symbols]

 1 Cylindrical header 2 Cylindrical header (lower header) 3 Fins 4 Flat tube 4a Tube side 4b Tube leeward edge 8 Drain plate a Tube connection

Claims (1)

[Scope of utility model registration request] 1. A plurality of flat tubes (4) arranged in a horizontal direction with a pair of upper and lower cylindrical headers (1) and (2) horizontally arranged with fins (3) interposed therebetween. ) In the upper and lower ends of the tube (4) are connected in communication with each other, at least in the vicinity of the lower header of each tube (4), at least the left and right side surfaces (4a) and the leeward side edge (4).
For drainage, which is fitted to b) in a liquid-tight contact state and allows water droplets such as dew condensation water flowing down from the top to be drained to the outside of the heat exchanger without contacting the tube connection part (a) of the lower header (2). A heat exchanger, characterized in that it is provided with a plate (8).