KR20030032120A - Tube for heat exchanger - Google Patents

Abstract

PURPOSE: A tube for a heat exchanger is provided to improve efficiency of heat exchange by smoothing flow of heat exchange medium. CONSTITUTION: A heat exchanger tube(30) includes a main body(31) having a space formed therein; a partition(32) forming a plurality of channels(33) in the space for heat exchange medium to flow therein; and at least one micro fin(34) formed on a location in the channel where inner walls neighboring each other cross each other. The micro fins are formed in pairs to face each other. Heat exchange medium flows in turbulence to actively exchange heat with the outside air thereby.

Description

Heat exchanger tube {Tube for heat exchanger}

The present invention relates to a heat exchanger tube, and more particularly, to a heat exchanger tube having an improved structure of a micro fin installed in a passage part in the tube.

In general, heat exchangers are indispensably used in automobile air conditioning systems. A heat exchanger is a device for exchanging heat by directly or indirectly contacting two fluids having different temperatures. A heat exchanger includes a passage part through which a heat exchange medium can flow, and exchanges heat with external air while the heat exchange medium flows through the passage part. It is a device designed to perform.

Such heat exchangers vary depending on their use and type. Divided into applications, there are evaporators, condensers, compressors, and radiators. By type, there are shock-tube types, serpentine types, drone-cup types, and parallel-flow types.

Among the heat exchangers described above, an example of a parallel-flow type heat exchanger is shown in FIG. 1.

Referring to the drawings, in the heat exchanger 10, a pair of header pipes 11a and 11b spaced apart from each other at predetermined intervals and a plurality of flat tubes 12 are provided so as to communicate with each other.

A heat dissipation fin (Fin) 13 is formed between the tubes 12 to maximize the surface area of the heat dissipation, and ends of the header pipes 11a and 11b are sealed with a cap 14. Supporters 15 are coupled to upper and lower outermost sides of the plurality of tubes 12 to support the fins 13 disposed outside the arranged tubes 12. The heat exchange medium is supplied through the supply pipe 11c connected to the header pipes 11a and 11b to flow through the header pipes 11a and 11b and the tube 12 and is discharged through the discharge pipe 11d.

The heat exchanger 10 configured as described above is a condenser, and the heat exchange medium supplied through the supply pipe 11c is introduced into the header pipe 11a connected to the supply pipe 11c and flows through the tube 12. The heat exchange medium in the tube 12 flows to the header pipe 11b on the other side. The heat exchange medium of the header pipe 11b is transferred to the tube 12 immediately below the tube 12 and flows. Since the baffles (not shown) are installed in each of the header pipes 11a and 11b, the flow path of the heat exchange medium between the tube 12 and the header pipes 11a and 11b is continuously changed. The ends of the header pipes 11a and 11b are closed with caps 14, respectively, so that the heat exchange medium is finally discharged from the discharge pipe 11d.

As such, the heat exchange medium undergoes heat exchange with the outside air while flowing through the inner space of the tube 12. In this flow process, the phase change from the gas phase to the liquid phase results in a very complicated flow form.

However, when the heat exchange medium phase changes from the gas phase to the liquid phase, since the heat exchange medium condenses from the inner wall of the passage part, the liquid heat exchange medium surrounds the inner wall of the passage part. As a result of the liquid heat exchange medium surrounding the inner wall of the passage, the gaseous heat exchange medium does not come into direct contact with the inner wall of the passage, resulting in a decrease in the heat exchange performance of the heat exchanger.

In order to solve this problem, in the liquid heat exchange medium surrounding the inner wall of the passage, the liquid film is broken so that the gaseous heat exchange medium is in direct contact with the inner wall of the passage, and the heat exchange medium flows in the tube in turbulent form. By doing so, it is necessary to make the heat exchange with the outside air more actively.

As a related technology, a heat exchanger tube disclosed in Korean Patent Laid-Open Publication No. 2000-032399 is shown in FIG. 2.

In the disclosed heat exchanger tube 20, a plurality of partitions 22 are formed in an inner space of the main body 21, and a plurality of passages 23 through which the heat exchange medium flows are provided by the partitions 22. have. A plurality of micro-fins 24 are formed on both inner side walls 23a of the passage part 23.

As a result, the heat exchange medium collides with the micro shock 24 while passing through the passage part 23, and exchanges heat with external air while flowing in an active turbulent state. As the turbulent flow continues as described above, the heat exchange medium gradually changes into a liquid state.

However, in the heat exchanger tube having the above-described configuration, the micro fins can break the liquid film and promote turbulence of the heat exchange medium when the liquid heat exchange medium collides, thereby increasing the heat exchange efficiency. By being formed on both inner side walls, the flow of the heat exchange medium may be interrupted when the heat exchange medium phase-changed into the liquid phase passes through the passage portion. Therefore, pressure loss of the heat exchange medium may be caused, and the discharge pressure may be significantly reduced.

In order to prevent this, if the number of micro fins is reduced or the protrusion height of the micro fins is reduced, turbulence of the heat exchange medium may not be sufficiently achieved. If the protrusion height of the micro fins is reduced, manufacturing difficulties may occur. The cost can be increased.

The present invention is to solve the above problems, by forming a micro fin at the intersection of the passage portion of the tube, to promote the turbulence of the heat exchange medium, smooth the flow of the heat exchange medium to improve the heat exchange efficiency The object is to provide a heat exchanger tube.

1 is a perspective view showing an example of a heat exchanger of a parallel flow type.

2 is a side cross-sectional view of a conventional heat exchanger tube.

Figure 3a is a side cross-sectional view of a heat exchanger tube according to the first embodiment of the present invention.

FIG. 3B is an enlarged partial side cross-sectional view of the passage part in FIG. 3A; FIG.

Figure 4 is a partial side cross-sectional view showing an enlarged passage portion in the heat exchanger tube according to a second embodiment of the present invention.

5 is a partial side cross-sectional view showing an enlarged passage portion in the heat exchanger tube according to the third embodiment of the present invention.

Figure 6 is a partial side cross-sectional view showing an enlarged passage portion in the heat exchanger tube according to the fourth embodiment of the present invention.

<Brief description of the major symbols in the drawings>

21,31.Body 22,32.Bulk

23,33 .. Passage part 24, 34, 41, 51, 61.

35. Main part 36. Projection part

52,62..Submicro 휜

The heat exchanger tube according to the present invention for achieving the above object is a main body having a predetermined space therein, a partition wall for providing a plurality of passages through which the heat exchange medium flows in the inner space of the body, and adjacent to the passage portion At least one micro pin is provided at intersections where the inner wall surfaces intersect.

In the microchip, the free end is preferably formed so as to lie on a diagonal line of the passage portion.

In the micro shock, the free end is preferably formed so as to lie off the diagonal of the passage portion.

In the micro shock, it is preferable that the fixed end is formed over adjacent inner wall surfaces so that recesses are formed on both sides of the fixed end, respectively, and the free end has at least one protrusion.

It is preferable to further provide the auxiliary micro shock which has a height which protrudes more than the said micro shock at the cross | intersection part of the channel | path part where the said micro shock was not formed.

It is preferable that the said auxiliary micro fin is formed on the plane of the inner side wall adjacent to the intersection part of the said passage part.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment according to the present invention will be described in detail.

3A is a side cross-sectional view showing a heat exchanger tube according to the first embodiment of the present invention, and FIG. 3B is an enlarged partial side cross-sectional view of a passage part in FIG. 3A.

Referring to FIGS. 3A and 3B, the heat exchanger tube 30 includes a main body 31 having a predetermined space to allow the heat exchange medium to flow therein, and a plurality of passage portions (the internal spaces of the main body 31). It is configured to include a partition 32 partitioned into 33.

The passage part 33 may be formed in a quadrangle or a circle. When formed in a circle, durability may be improved, but it may be preferable that the passage part 33 has a small area in contact with the heat exchange medium.

On the other hand, the passage 34, the micro shock 34 may be spaced apart at predetermined intervals along the longitudinal direction of the tube (30).

In addition, the micro shock 34 is formed in at least one of the intersections formed by the adjacent inner wall surfaces in the passage part 33. When the inner wall surfaces of the passage portion 33 are each flat, the intersection portion forms an edge.

As shown in the figure, the micro-chambers 34 are paired, have the same shape, and are preferably formed at each of the crossing portions that face each other in a diagonal direction.

The micro fin 34 has a fixed end 34b formed at an intersection of the passage portion, i.e., adjacent inner wall surfaces, and its cross-sectional area becomes smaller so that the free end 34a has its end as shown in the drawing. It may have a pointed shape or may have a rounded shape.

Thus, two recesses 35 are formed on the left and right sides of the fixed end 34b of the micro shock 34. On the other hand, the free end (34a) of the micro shock 34 is formed with at least one projection (36). In the case of two projections 36, such as the micro shock 34 at the lower right of the figure, recesses 35 are formed between the projections 36. That is, at least two recesses 35 may be formed on the side of the cross section of the passage part 33.

The free end 34a of the micro shock 34 is preferably formed to be on the diagonal of the passage portion 33.

As described above, when the micro shock 34 is formed at the intersection of the passage portion 33, which is usually a dead space, the dead space can be utilized, and the height of the micro shock 34 can be sufficiently increased. In addition, since the micro fin 34 is protruded from the crossing portion, the liquid film of the heat exchange medium flowing through the passage portion 33 can be easily broken.

In addition, by not forming the micro fin 34 on the plane of the inner wall of the passage part 33, the heat exchange medium changed into a liquid phase becomes more smoothly flowable along the inner wall of the passage part 33.

In the heat exchanger tube according to the second embodiment of the present invention, a partial side cross-sectional view showing an enlarged passage portion is shown in FIG. 4.

Since the microchip 41 according to the present embodiment has the same configuration except for the microchip 34 according to the first embodiment described above, only the different points will be described and the remaining components will be omitted. do.

That is, in the micro shock 41 according to the present embodiment, the position of the free end 41a is different from that of the first embodiment described above, but lies at a position deviated by the distance g from the diagonal of the passage portion 33.

And, as shown in the figure, the micro shocks 41 are paired, have the same shape, and the free ends 41a are provided with the passage portions 33, respectively, as described above, one at each crossing portion facing in the diagonal direction. It is formed to deviate from the diagonal of). In addition, in the micro shock 41, the fixed end 41b is formed over adjacent inner wall surfaces of the passage portion 33 as in the above-described embodiment.

5 is a partial side cross-sectional view of a heat exchanger tube according to a third embodiment of the present invention.

Referring to the drawings, two kinds of microhandles 51 and 52 having different shapes and sizes are formed at each intersection of the passage part 33.

That is, the micro shock 51, such as the micro shock 34 according to the first embodiment or the micro shock 41 according to the second embodiment, is formed at the intersection, and the micro shock 51 is not formed. At the non-crossing portion, a pair of auxiliary micro shocks 52 is formed.

It is preferable that the micro shock 51 and the auxiliary micro shock 52 formed in the passage part 33 be symmetrical with respect to the diagonal of the passage part 33.

In addition, in the auxiliary micro shocks 52, the fixed end 52b is formed over the adjacent inner wall surfaces of the passage portion 33 as in the above-described embodiments.

In addition, when the height of the protrusion of the micro shock 51 in the Y direction is y1 and the height of the protrusion of the auxiliary micro shock 52 in the Y direction is y2, y1> y2 and the direction of the micro shock 51 is in the X direction. When the height of protrusion of x1 and the height of protrusion of the auxiliary micro shock 52 in the X direction are x2, it is preferable that x1> x2.

On the other hand, the position of the micro shock 51 and the auxiliary micro shock 52 is not limited to that shown in the figure, the free end 52a of the auxiliary micro shock 52 is on the diagonal of the passage 33 Or may be placed in a predetermined position off the diagonal.

6 shows a partial side cross-sectional view of a heat exchanger tube according to a fourth embodiment of the invention.

The shape and position of the auxiliary micro shock 62 according to the present embodiment are different from the shape and position of the auxiliary micro shock 52 according to the third embodiment described above.

That is, a pair of micro shocks 61 are formed one by one at intersections facing each other in a diagonal direction, similar to the micro shocks 51 according to the third embodiment described above, and a pair of auxiliary micro shocks 62 are It is formed adjacent to the remaining intersection.

In addition, it is preferable that the micro chops 61 and the auxiliary micro chops 62 formed in the said passage part 33 are symmetrical with respect to the diagonal of the passage part 33. As shown in FIG.

In the auxiliary micro shock 62, a fixed end 62b is formed on the plane of the inner wall of the passage portion 33. As shown in FIG.

As described above, the micro shocks 34, 41, 51, 61 and the auxiliary micro shocks 52, 62 according to the embodiments utilize the dead space to intersect or intersect the passages 33 in the tube. It is formed on the plane of the inner wall adjacent to.

Therefore, the heat exchange medium hits the passage part 33 in the above-described micro fins 34, 41, 51, 61 and auxiliary micro fins 52, 62 and flows in a turbulent state to exchange heat with external air. The heat exchange medium changed into the liquid phase may flow smoothly along the inner wall of the passage part 33.

As described above, the heat exchanger tube according to the present invention increases heat exchange performance as the heat exchange medium flows in a turbulent state and actively exchanges heat with external air, and together with this, the heat exchange medium flows through the passage part of the tube to form a liquid phase. Even after the change, the flow can be smooth.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. will be. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

A main body having a predetermined space formed therein, Barrier ribs for providing a plurality of passages through which a heat exchange medium flows into an inner space of the main body; And the passage portion has at least one or more micro fins at intersections where adjacent inner wall surfaces intersect. The method of claim 1, In the micro shock, And a free end formed so as to lie on a diagonal line of the passage portion. The method of claim 1, In the micro shock, And the free end is formed to lie off a diagonal of the passage portion. The method of claim 2 or 3, The heat exchanger tube of claim 1, wherein the fixed end is formed over adjacent inner wall surfaces, and recesses are formed on both sides of the fixed end, respectively, and the free end has at least one protrusion. The method of claim 2 or 3, In the passage section, The cross section of the passage portion where the micro fins are not formed further includes an auxiliary micro fin which has a smaller protruding height than the micro fins. The method of claim 5, The heat exchanger tube of claim 2, wherein the fixed end is formed over adjacent inner wall surfaces, and recesses are formed on both sides of the fixed end, respectively, and the free end has at least one protrusion. The method of claim 5, The auxiliary micro wire, And a heat exchanger tube formed on a plane of the inner wall adjacent to the intersection of the passage portion.