JP2000161888A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger having heat exchanging tubes and inner fins in which the inner fins and the inner surface of the heat exchanging tube can be held surely in brazed state by providing a part to be engaged with the inner fins on the inner surface of the heat exchanging tube. SOLUTION: A multi-flow type heat exchanger 1 comprises a plurality of heat exchanging tubes 4 extending between a pair of headers 2, 3, and corrugate fins 5 arranged between respective heat exchanging tubes 4 and on the upper and lower sides of the upper and lower heat exchanging tubes 4 wherein each heat exchanging tube 4 is constructed by inserting inner fins 32 into a tube 31. The tube 31 is provided with a plurality of protrusions 34 extending in the longitudinal direction and each protrusion 34 is engaged with the corresponding ridge or groove of the inner fin 32. According to the structure, the inner fin 32 can be held accurately at a specified position and can be brazed surely thereat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a heat exchange tube having an inner fin in a tube.

[0002]

2. Description of the Related Art There is known a heat exchanger in which inner fins are provided inside a heat exchange tube to form a plurality of small flow paths inside the tube or to rectify the flow in the tube (for example, an actual heat exchanger). JP-A-7-12772).

In such a heat exchanger, when assembling a heat exchanger using a heat exchange tube, first, an inner fin is inserted into the heat exchange tube, and the inner fin is held at a predetermined position. For example, the inner fin is fixed to a predetermined position in the tube by integral brazing or the like.

[0004]

However, in the above-described heat exchanger, when the inner fin is inserted into the heat exchange tube and is in a temporarily assembled state until the inner fin is fixed by brazing or the like. In addition, there is a problem that it is difficult to accurately hold the inner fin at a predetermined position in the tube. In addition, the brazing property between the inner fin and the inner surface of the heat exchange tube is
Since the effect on heat exchange performance and the like is great, more complete brazing is desired.

[0005] Accordingly, an object of the present invention is to pay attention to such problems and demands, and it is possible to accurately hold an inner fin at a predetermined position in a heat exchange tube in a temporarily assembled state and to braze. It is another object of the present invention to provide a heat exchanger structure capable of ensuring that the inner fin and the inner surface of the tube are securely fixed by brazing.

[0006]

In order to solve the above-mentioned problems, a heat exchanger according to the present invention comprises a heat exchange tube through which a heat exchange medium flows in a longitudinal direction, and an inner fin provided in the tube. The heat exchanger according to claim 1, wherein an engagement portion with an inner fin is provided on an inner surface of the heat exchange tube.

[0007] It is preferable that the heat exchange tube is formed of a plate material. For example, in the case of forming a tube by bending a flat plate material, even if an engaging portion protruding on the inner surface of the tube is formed, the tube material can be easily bent by bending the plate material after disposing the inner fin. The inner fin can be arranged and fixed at a predetermined position in the inside.

[0008] The engaging portion can be formed either in a direction extending in the width direction of the heat exchange tube or in a direction extending in the longitudinal direction. Also, the shape of the engaging portion itself may be a mere projection, or may be a ridge or a groove.

The inner fin may be formed in a corrugated shape as viewed in the tube cross-sectional direction. Alternatively, the inner fin is formed by cutting and bending a large number of peaks and valleys in a plate-like member, and forming a ridge, a first flat portion, a valley, and a second flat portion repeatedly in this order. Are arranged adjacent to each other, and the adjacent uneven stripes are in a positional relationship such that the first flat portion of one uneven stripe forms a continuous flat portion with the second flat portion of the other uneven stripe. It can also be made of a structure composed of

[0010] In such a heat exchanger, an engagement portion is provided on the inner surface of the heat exchange tube, and the inner fin is engaged with the engagement portion. Can be determined accurately. Since the function of the engagement mechanism is exerted as it is even in the temporarily assembled state, the inner fin is accurately held at a predetermined position in the heat exchange tube, and is securely brazed and fixed at the predetermined position.

In addition, by providing a plurality of engaging portions and engaging the inner surface of the tube and the inner fin with each other at a plurality of appropriate positions, the number of joints and the joint area between the tube and the inner fin are increased, and the heat exchange is performed. The strength, rigidity, and pressure resistance of the entire tube are greatly improved, and in combination with the above-mentioned reliable brazing, a heat exchange tube excellent in both mechanical properties and heat exchange properties, and also excellent in assemblability is realized.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the heat exchanger according to the present invention will be described below with reference to the drawings. FIG.
Shows a heat exchanger according to one embodiment of the present invention,
In particular, it shows a so-called multi-flow type heat exchanger constituting a condenser. In the figure, 1 indicates the entire condenser, and 2 and 3 indicate a pair of headers. A plurality of heat exchange tubes 4 extend in parallel between the headers 2 and 3, and corrugated fins 5 are provided between the heat exchange tubes 4 and above and below the upper and lower heat exchange tubes 4. Are located. Side plates 6 are respectively provided above the uppermost corrugated fins 5 and below the lowermost corrugated fins 5. One header 3 is provided with an inlet pipe 7 and an outlet pipe 8, and the refrigerant introduced from the inlet pipe 7 into one chamber of the header 3 partitioned by the partition plate 9 passes through the heat exchange tube 4. It is fed into the other header 2 and from there again through the remaining heat exchange tubes 4 to the other chamber of the header 3, from where it is led out through the outlet pipe 8. The direction of arrow 10 in FIG. 1 is the air passage direction.

Each heat exchange tube 4 of the condenser 1 is constructed as shown in FIGS. 2 to 4 in the first embodiment. In FIG. 2, reference numeral 31 denotes a tube portion of the heat exchange tube 4, in which an inner fin 32 is inserted and provided. In the present embodiment, the inner fin 32 is configured as shown in FIG. 3, and the direction of the arrow 33 is the flow direction of the refrigerant and the longitudinal direction of the tube 31.

The tube 31 is provided with a plurality of ridges 34 extending in the longitudinal direction, and each ridge 34 projects inward of the tube 31. Each ridge 34 is shown in FIG.
As shown in FIG. 3, the inner fin 32 is engaged with the corresponding peak or valley, respectively. Therefore, these ridges 34 constitute an engagement portion with the inner fin according to the present invention.

In the present embodiment, the engaging portions 34 are provided on the upper and lower inner surfaces of the tube 31 as shown in FIGS. 2 and 4, but may be provided on either one of the upper and lower surfaces. The number may be any number. For example, the inner fins 32 may be provided at every other peak or valley or at every other pitch.

Further, as a modified example of the above embodiment, in addition to a ridge projecting inward of the tube, a concave groove 35 as shown in FIG.
May be formed as the tube 36. Further, although not shown, it may be formed as a simple projection protruding inward of the tube, and a structure in which such a projection is arranged at an appropriate portion on the inner surface of the tube may be adopted.

In the embodiment apparatus thus configured, each peak or valley of the corrugated inner fin 32 is
The inner fin 3 is engaged with each of the ridges 34 and the concave groove 35 as an engaging portion formed on the inner surface of the tube 31.
2 is accurately determined at a predetermined position in the tube 31. This state is maintained as it is even in the tentatively assembled state before brazing. Since brazing is performed in this state, the tube 31 and the inner fin 32 are securely brazed and fixed in a desired positional relationship. Also, the brazing property and the assembling property when brazing integrally with other parts are very good.

The inner fin 32 is connected to the tube 31.
The brazing area is enlarged since the brazing is performed at various places with respect to the inner surface, and the brazing is performed in a state of being engaged with the ridges 34 and the concave grooves 35, so that a more complete brazing state is achieved. Is secured. As a result, the heat exchange tube 4 after brazing has high strength, high rigidity, and high pressure resistance.

FIGS. 6 to 9 show an inner fin and a heat exchange tube with a built-in inner fin of a heat exchanger according to a second embodiment of the present invention.

In this embodiment, as shown in FIG.
A number of peaks 14 and valleys 15 are formed in the inner fin 12, and these peaks 14 and valleys 15 cut and raise the peaks 14 and valleys 15 in the plate-shaped member and are simultaneously bent. It is formed by processing. For this bending, roll bending can be used, for example, as in the case of forming the corrugated fin 5.

The direction of the arrow 13 in FIG. 6 indicates the flow direction of the refrigerant, and the inner fin 12 has a peak portion 14, a first flat portion 16, a valley portion 15, and a second flat portion 17 repeated in this order. A plurality of formed ridges 18 (shown in FIG. 6) are arranged adjacent to each other. And the adjacent uneven strip 1
8, the first flat portion 16 of the one uneven strip 18 forms a flat portion continuous with the second flat portion 17 of the other uneven strip 18, and the second flat portion of the one uneven strip 18 is formed. The portion 17 is arranged in such a positional relationship as to form a flat portion continuous with the first flat portion 16 of the other uneven strip 18. Therefore,
In this example, when viewed in the width direction of the tube 11, the first flat portion 16 and the second flat portion 17 form a flat portion extending linearly, and the peak portion 14 and the valley portion 15 are adjacent to each other. Are arranged alternately. A communication hole 19 communicating the upper and lower surfaces of the inner fin 12 is formed in the cut-and-raised portion of each peak 14 and valley 15.

On the inner surface of the tube 11 into which the inner fin 12 is inserted, as shown in FIG. 8, a plurality of ridges 20 extending in the width direction of the tube 11 and projecting inward of the tube are provided. ing. The protruding ridges 20 constitute an engaging portion referred to in the present invention, and are engaged with the respective ridges 14 and valleys 15 of the inner fin 12 as shown in FIG. It is temporarily assembled in this engagement state, and integral brazing is performed in that state.

In the present embodiment, the tube 11 is formed by bending a flat plate member (plate material), and the flange portions 21 are brazed to each other after the bending process. If it is difficult to insert the inner fin 12 after the formation of the tube 11 having the ridge 20, the inner fin may be arranged at a predetermined position before bending the tube. It is also possible to form a tube without the ridge 20 first, insert the inner fin into the tube, and then press-mold the ridge 20, for example.

Further, similarly to the first embodiment, it is possible to use an engaging portion formed of a concave groove instead of the ridge 20. For example, as shown in FIG. 10, a tube 23 in which a concave groove 22 extending in the same direction as the above is formed on the inner surface of the tube 11,
Each of the ridges 14 and the valleys 15 of the inner fin 12 can be engaged with each of the concave grooves 22.

Further, the tube 11 is formed by bending one end in the width direction. For example, as shown in FIG. 11, two flat members 24a and 24 are formed.
A tube 26 having a structure in which the folded portions 25 are formed on both sides in the width direction of b and the corresponding folded portions 25 of the two flat plate members 24a and 24b are joined to each other. The number of times of folding in each folding section 25 can be set arbitrarily. Alternatively, the folded portion may be formed on only one of the flat members, and the other flat member may be a mere flat plate.

In the heat exchange tube 4 having the inner fins 12 as described above, as shown by arrows in FIG. After the dispersion, the inner fins 1 pass through the communication holes 19.
2 can freely enter and exit from the front and back sides, and some
Goes straight on the flat portion 17 of the ridge and the next mountain portion 1 next to the adjacent uneven stripe 18.
Reaches 4. On the back surface side of the inner fin 12, the valley portions 15 perform the same function as the above-mentioned ridge portions 14 and have a similarly dispersed flow. Since the plurality of uneven strips 18 are arranged adjacently with the peaks 14 and the valleys 15 being offset,
The above-mentioned dispersed flows merge in each part, and the dispersion and the merge are repeated. Therefore, the refrigerant flowing in the tube 11 flows while being constantly mixed, and is uniformly mixed in the width direction of the tube 11, that is, in the air passage direction. At the same time, the first
The flat portion 16 and the second flat portion 17 serve to rectify the flow, so that the mixing and the rectification are performed repeatedly in a fine manner. As a result, the heat transfer performance in the width direction of the tube 11 is made uniform, the heat exchange performance is made uniform, and the heat exchange performance of the entire tube 11 and thus of the condenser is improved.

By providing the engaging portions 20 (22), each peak portion 14 and valley portion 1 of the inner fin 12 are provided.
5 is engaged with and fixed to the engaging portion 20 (22), and is brazed to a predetermined position with high accuracy in the temporarily assembled state. Accordingly, a more complete brazing state is ensured, and a brazing location and a brazing area are increased, so that the strength, rigidity, and pressure resistance of the entire tube are improved.

Although the above embodiments have been described with reference to the condenser, the present invention is not limited to this, but is applicable to other heat exchangers as long as they have a heat exchange tube provided with inner fins. It goes without saying that you can do it.

[0029]

As described above, according to the heat exchanger of the present invention, the engagement portion with the inner fin is provided on the inner surface of the heat exchange tube so that the heat exchange tube can be securely held at a predetermined position in the tube.
As positioning is possible, it is possible to improve the assemblability at the time of temporary assembling and brazing, as well as to improve the complete brazing state and the overall strength, rigidity and pressure resistance of the tube after brazing. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the heat exchange tube according to the first embodiment of the present invention.

FIG. 3 is an enlarged partial perspective view of an inner fin of the heat exchange tube of FIG. 2;

FIG. 4 is a partial sectional view of the heat exchange tube of FIG. 2 incorporating the inner fin of FIG. 3;

FIG. 5 is a partial sectional view of a heat exchange tube according to a modification of FIG.

FIG. 6 is a partial perspective view of an inner fin of a heat exchange tube according to a second embodiment of the present invention.

FIG. 7 is a partial perspective view of the inner fin of FIG. 6;

FIG. 8 is a partial perspective view of a heat exchange tube according to a second embodiment.

FIG. 9 is a partial cross-sectional view of the heat exchange tube of FIG. 8 incorporating the inner fin of FIG. 6;

FIG. 10 is a partial cross-sectional view of a heat exchange tube according to a modification of FIG.

FIG. 11 is a partial perspective view of a heat exchange tube according to a modification of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condenser (heat exchanger) 2, 3 Header 4 Heat exchange tube 5 Corrugated fin 6 Side plate 7 Inlet pipe 8 Outlet pipe 9 Partition plate 10 Air passage direction 11, 23, 26, 31, 36 Tube 12, 32 Inner fin 13, 33 Refrigerant flow direction (longitudinal direction of tube) 14 Crest portion 15 Valley portion 16 First flat portion 17 Second flat portion 18 Concavo-convex strip 19 Communication hole 20, 34 Projection strip 22, 35 as engagement section Groove as engaging part

Claims (8)

[Claims] 1. A heat exchanger having a heat exchange tube through which a heat exchange medium flows in a longitudinal direction and an inner fin provided in the tube, wherein the inner surface of the heat exchange tube is engaged with the inner fin. Heat exchanger characterized by having a part. 2. The heat exchanger according to claim 1, wherein said heat exchange tube is formed from a plate material. 3. The heat exchanger according to claim 1, wherein the engaging portion extends in a width direction of the heat exchange tube. 4. The heat exchanger according to claim 1, wherein the engaging portion extends in a longitudinal direction of the heat exchange tube. 5. The heat exchanger according to claim 1, wherein said engaging portion comprises a projection. 6. The heat exchanger according to claim 1, wherein the engaging portion comprises a ridge or a groove. 7. The heat exchanger according to claim 1, wherein the inner fin is formed in a waveform in a tube cross-sectional direction. 8. The inner fin is formed by cutting and bending a large number of peaks and valleys on a flat plate-like member, and forming the peaks, the first
A plurality of uneven portions formed by repeating the flat portion, the valley portion, and the second flat portion in this order are arranged adjacent to each other, and the adjacent uneven portions are the first flat portion of one uneven portion being the other. The heat exchanger according to any one of claims 1 to 6, wherein the heat exchanger has a positional relationship of forming a continuous flat portion with the second flat portion of the uneven strip.