KR20040008343A - Fin & flat tube type Heat exchanger and Evaporator using the same - Google Patents

Abstract

PURPOSE: A finned and flat tube-type heat exchanger and an evaporator using the finned and flat tube-type heat exchanger are provided to improve the heat exchange efficiency, reduce the size and weight of the heat exchanger, and smoothly discharge condensate, and apply the heat exchanger to the evaporator of an air conditioner. CONSTITUTION: A finned and flat tube-type heat exchanger(10) comprises plural flat radiant fins(30) disposed at regular intervals; plural flat tubes(40) orthogonally joined with the flat radiant fins; and plural return tubes(45) installed at the ends of the flat tubes; and refrigerant inlets and outlets installed on a side of the flat tube. A supplied refrigerant flows through the return tubes in a zigzag shape.

Description

Fin & flat tube type Heat exchanger and Evaporator using the same}

The present invention relates to a heat exchanger used in air conditioners, refrigerators, and the like, and more particularly, a flat tube in which a plurality of refrigerant flow paths are arranged in a row and a plurality of flat heat dissipation fins arranged to be orthogonal to the flat tube are brazed and bonded to each other. The present invention relates to a heat-and-flat tube heat exchanger which is suitable for an evaporator because the condensate generated during the heat exchange process is smoothly drained as well as the thermal efficiency is increased.

In general, the cooling cycle of the air conditioner is a compressor 92 for compressing a low temperature gas refrigerant into a high temperature gas refrigerant as shown in FIG. An outdoor unit (B) consisting of an air purifier, an expansion device (96) for converting a liquid refrigerant into a liquid refrigerant having a low temperature and a low pressure, and an indoor air for blowing cold air heat exchanged with an evaporator (98) in which heat exchange with a refrigerant of a cooling cycle is performed. It consists of an indoor unit (A) consisting of a blower (99).

At this time, the heat exchanger constituting the condenser 94 and the evaporator 98 is composed of a plurality of refrigerant flow pipes in which the refrigerant flows and a plurality of heat radiating fins to increase the heat transfer area in contact with the outer peripheral surface of the refrigerant flow pipe. Groups are largely classified into fin & tube type heat exchangers and flat tube type heat exchangers according to the shape and structure of the refrigerant flow pipe and the heat dissipation fin. That is, as schematically shown in FIG. 2, the conventional heat exchanger tube heat exchanger 20 is composed of a plurality of circular tubes 25 and a plurality of flat heat radiation fins 27 installed in contact with the outer circumferential surface of the circular tube. Consists of. In addition, as shown in FIG. 4, the flat tube heat exchanger 50 includes a plurality of flat tubes 55 in which a plurality of refrigerant passages 53 are arranged in a row, and a plurality of flat tubes 55 are in contact with the upper and lower surfaces of the flat tube. It consists of a wave-shaped or colloidal heat dissipation fan 57.

Therefore, the conventional fan and tube heat exchanger 20 and the flat tube heat exchanger 50 has the following disadvantages, respectively. That is, as shown in FIG. 3, the conventional heat exchanger tube-type heat exchanger 20 has a circular heat exchange efficiency because the heat exchange area is only 50 to 70% compared to the volume of the refrigerant flow path. ) Is physically expanded and closely adhered to the heat dissipation fin 27, so that water, oil, and the like form a film Flim due to a capillary phenomenon at the contact portion to generate a heat transfer resistance. Therefore, in order to compensate for this, the area of the heat dissipation fan 27 installed on the outside should be increased or the length of the tube 25 should be lengthened, thereby increasing the size and weight of the heat exchanger. In addition, the conventional wet-and-tube heat exchanger (20) has to go through a complex process, such as a press press process, hairpin tube insertion process, expansion process, u-band installation process, header welding process, degreasing, washing, drying in the manufacturing process, automation There is a problem that the manufacturing cost is increased due to the impossible to manufacture.

On the other hand, the conventional flat tube type heat exchanger (50) has an advantage that the heat transfer area is increased compared to the refrigerant flow path volume has an excellent heat exchange efficiency, but the upper surface of the flat tube 55 formed with the condensed water (W) generated during the air cooling horizontally There was a problem that stagnant in the valley portion of the wave-type heat radiation fan 57 does not flow down. As such, when the condensate is stagnant, the airflow resistance is increased to decrease the air flow rate, and the heat transfer effect is reduced, resulting in deterioration of the heat exchange performance. have. Therefore, due to this problem, the conventional flat tube type heat exchanger 50 has been partially applied only to a vehicle forcibly discharging condensate and discharged, and has not been adopted in a household air conditioner evaporator to which a natural condensate drainage method is applied.

In order to solve this problem, the present inventors make use of both the advantages of a flat tube heat exchanger having excellent heat efficiency due to the large inner (refrigerant side) heat transfer area and the advantages of a fan-and-tube heat exchanger having natural drainage of condensate and good ventilation. It has led to the invention of a new type of heat exchanger capable of miniaturization and light weight, natural drainage of condensate and automation of the production process.

Therefore, the main object of the present invention is to provide a wet and flat tube heat exchanger that can be applied to the air-conditioning evaporator as the heat exchange efficiency is improved and can be miniaturized and reduced in weight as well as the natural drainage of condensate is smooth.

In addition, the present invention improves the refrigerant-side heat exchange efficiency by employing a flat tube having a plurality of refrigerant passages arranged in a line as a refrigerant flow tube, and cooling by installing a flat heat dissipation fin having a plurality of condensate flow passages orthogonal to the flat tube. The purpose of the present invention is to provide a heat exchanger for an air conditioner evaporator that maintains the efficiency of the evaporator by allowing the condensed water generated during the heat exchange of the heat radiation fins and the room air at room temperature to be smoothly discharged to the lower side of the evaporator by gravity.

1 is a conceptual diagram showing a typical air conditioning cooling cycle,

Figure 2 is a schematic partial cutaway perspective view showing the structure of a conventional heat exchanger tube and tube type heat exchanger,

3 is a partial cross-sectional view of a heat exchanger tube and tube type heat exchanger according to the prior art in which a film of moisture, oil, or the like is formed between the tube and the tube;

4 is a schematic partial cutaway perspective view showing the structure of a flat tube heat exchanger according to the prior art;

5 is a partial cross-sectional view of a flat tube heat exchanger according to the prior art in which condensed water stays in the top of the flat tube and the valley of the wave heat dissipation fin;

6 is a schematic partial cutaway perspective view showing a flat and heat exchanger of heat exchanger according to the present invention;

7 is a partial cutaway perspective view showing an example of a flat heat dissipation fin applied to the heat exchanger flat fan type heat exchanger according to the present invention;

Figure 8 is a perspective view showing an example of the flat tube applied to the heat exchanger flat heat exchanger according to the present invention,

9a and 9b are a perspective view and a plan view showing a preferred embodiment of the heat exchanger flat heat exchanger according to the present invention;

10, 11 and 12 is a perspective view showing the evaporator for various types of air conditioner using the heat and flat tube heat exchanger according to the present invention,

13 is an explanatory diagram showing the movement of condensate;

14 is a flowchart showing a manufacturing process of an evaporator for an air conditioner using a flat & heat exchanger having a flat tube type according to the present invention.

In order to achieve the above object, the heat exchanger according to the present invention includes a plurality of flat heat dissipation fans arranged to be spaced apart at regular intervals; A plurality of flat tubes coupled to be orthogonal to the flat heat dissipation beam; And a plurality of return tubes installed at both ends of the flat tube to allow the supplied refrigerant to flow in a zigzag manner.

The flat heat dissipation fin according to the present invention includes a plurality of long hole-type insertion holes formed of a metal thin plate having a predetermined width and height and spaced apart by a predetermined distance in up, down, left and right directions, and a predetermined depth formed close to the long hole insertion hole. Characterized in that configured to include a condensate flow path.

In addition, the flat tube according to the present invention is characterized in that a plurality of refrigerant passages are formed in a line by a plurality of partition walls having a flat plate-shaped cross section formed at a predetermined interval.

The linton tube has a cross section similar to that of the flat tube, and is bent in a U shape to allow two adjacent flat tubes to communicate with each other.

On the other hand, according to the present invention, the air-conditioning evaporator using the fan and flat tube heat exchanger and a plurality of flat heat dissipation fins arranged at regular intervals; A plurality of flat tubes arranged integrally and orthogonally joined to the flat heat dissipation beam; A plurality of return tubes installed at both ends of the flat tube to allow the refrigerant to flow in a zigzag manner; A refrigerant distributor for uniformly distributing the high pressure liquid refrigerant flowing from the condenser; An expansion device for throttling and expanding the high pressure liquid refrigerant to a pressure and a temperature at which vaporization is possible; An inlet for supplying the expanded refrigerant to the flat tube; The heat exchange is completed and comprises an outlet for sending the vaporized refrigerant to the compressor.

In addition, the present invention is characterized in that it further comprises one or more refrigerant header tube bonded to the flat tube to inject or outflow of the refrigerant.

Hereinafter, a fan and flat tube heat exchanger according to the present invention and an evaporator for air conditioner using the same will be described in detail with reference to the accompanying drawings. First, Figure 6 is a partially cut perspective view showing the structure of the heat exchanger tube flat heat exchanger 10 according to the present invention. As shown, a plurality of flat heat dissipation fins 30 vertically spaced apart at regular intervals, a plurality of flat tubes 40 horizontally orthogonal to the flat heat dissipation fins 30, and each flat It consists largely of a plurality of return tubes 45 joined at both ends thereof so that the tubes communicate with each other.

7 is a perspective view showing an example of the flat tube 40 according to the present invention, Figure 8 is a partially cut perspective view showing an example of a flat heat dissipation fin (30) applied to the heat exchanger according to the present invention, As described above, the flat tube 40 forms a plurality of refrigerant passages 43 by forming partition walls 41 at predetermined intervals inside the flat tube, and thus has a shape similar to that of the conventional flat tube 55. Compared to the flat tube 55, its width is small. Therefore, the flat tube 40 according to the present invention has a larger heat transfer area than the conventional round tube 25 and induces an annular flow due to the surface tension of the refrigerant passage 43, thereby increasing the heat transfer effect. Will be.

The flat heat dissipation fin 30 is formed of a thin metal plate having a predetermined width and height, and a plurality of rectangular burrs 31 protruding at a predetermined length are spaced apart at a predetermined distance in a vertical direction on one side thereof. Is formed to form an elongated insertion hole 33 into which the flat tube 40 can be inserted. In addition, a plurality of condensate flow paths 35 are formed close to the long insertion hole 33 and bent to a predetermined depth in the longitudinal direction of the heat dissipation beam. And reference numeral 37 is a notch groove 37 formed to form a plurality of scale pieces so that air can penetrate.

Therefore, as shown in Figure 6, assembled by inserting a plurality of flat tubes 40 horizontally in the insertion hole 31 of the plurality of flat heat dissipation fins 30 arranged spaced apart by the length of the rectangular bur (31). Then, after installing the U-shaped return tube 45 at both ends of the flat tube 40, the combination is passed through a high-temperature heating furnace by brazing and joining the flat and heat tube heat exchanger according to the present invention ( 10) is completed. At this time, since the flat heat dissipation fin 30, the flat tube 40 and the return tube 45 are clad coated with a filler metal, they pass through a brazing furnace that emits high heat of 450 ° C. or higher. The clad coated metal is melted by high heat to naturally fuse each member.

9A and 9B show a preferred embodiment of the flat heat exchanger 10 according to the present invention. As shown, the flat heat dissipation fin 30 supports the assembled flat tube 40 at the same time. Support plates 60 for protecting them from damage by external forces are separately installed on both sides of the heat exchanger. At this time, the support plate 60 is preferably formed integrally with the insertion hole 33 through which the flat tube 40 and the condensate flow path 35 through which the condensed water is drained. In addition, an inlet 63 through which the refrigerant is introduced is installed at one end of the support plate 60, and an outlet 65 through which the refrigerant is discharged is installed at the lower end thereof. Therefore, the refrigerant supplied through the inlet 63 flows in a zigzag manner through the plurality of flat tubes 40 and the return tube 45, and then heat exchanges with the indoor air, and then is discharged through the refrigerant outlet 65.

On the other hand, as shown in the plan view of Figure 9b, since the flat tube 40 according to the present invention is installed at a predetermined distance apart from the same plane generated condensate water flow path 35 between the flat tube 40 It will naturally drain down. Therefore, the condensed water is prevented from remaining on the upper surface of the flat tube 40 to prevent the heat exchange performance is reduced or to block the flow of air.

Next, a preferred embodiment of the evaporator for an air conditioner using the wet and flat tube type heat exchanger 10 according to the present invention will be described. There may be. For example, FIG. 10 is a schematic perspective view showing an evaporator for axially expanding a liquid refrigerant with a capillary tube 75. FIG. 11 is a perspective view showing an evaporator for throttling a liquid refrigerant using an expansion valve, and FIG. 12 is a heat exchanger. The refrigerant inlet and outlet header tube 83 and the return header tube 85 are respectively installed on the left and right sides of the machine, and the refrigerant injected through the inlet tube 86 is supplied to the plurality of flat tubes 40 through the inlet and outlet header tube 83. Then, the refrigerant whose flow direction is changed by the return header tube 85 is discharged through the outlet tube 87. At this time, one or more blocking plates 88 are integrally formed in the outflow header tube 83 to control the flow path of the refrigerant.

Hereinafter, the operation of the evaporator using the wet and flat tube heat exchanger 10 according to the present invention will be briefly described with reference to the accompanying drawings. First, as shown in FIG. 10, the high-pressure liquid refrigerant liquefied in the condenser is a refrigerant distributor 73. ) Is uniformly divided into one or more capillary tubes (75) and the high pressure liquid refrigerant expands during passage through the capillary tubes (75) and enters the flat tube (40) through the induction tube (77). On the other hand, as shown in FIGS. 11 and 12, when the expansion valve 72 is used, the high-pressure liquid refrigerant introduced from the condenser is throttled and expanded while passing through the expansion valve 72 to be uniformly distributed by the refrigerant distributor 73. It is distributed and flows into the flat tube 40 through the branch pipe 76 and the inlet header pipe 77 or the inlet header pipe 83. The refrigerant introduced in this manner flows in a zigzag manner along the plate tube 40 and the return tube 45 or the return header tube 85, and evaporation is completed, and the vaporized refrigerant is the outlet header tube 78 or the outlet header tube. It is discharged through (83).

On the other hand, the liquid refrigerant supplied into the flat tube 40 is a phase change from the liquid state to the gas state and the latent heat of evaporation required at this time is obtained from the outside through the flat tube (40). In this process, the external heat is moved to air → radiation 휜 → flat tube → refrigerant, and the refrigerant cools the air passing through the evaporator through endothermic action. At this time, when the air below the dew point temperature comes into contact with the surface of the heat dissipation fan 30, condensate water is generated. As shown in FIG. It moves downward in an oblique direction by the applied force and the force of gravity acceleration in the direction of gravity, and then flows down along the condensate flow path 35 formed between the flat tubes 40. Therefore, the evaporator according to the present invention is suitable for the evaporator for home air conditioners because the natural drainage of the condensate is made smoothly. On the other hand, the heat exchanger according to the present invention as described above is suitable for the evaporator because the natural drainage of the condensate is smooth, but it is also possible to use for the condenser because the thermal efficiency is superior to the conventional heat exchanger and the manufacturing process is simple. The heat exchanger according to the invention is thus not limited to just an evaporator but can be used in either case of an evaporator and a condenser.

Next, the manufacturing process of the evaporator using the wet and flat tube type heat exchanger which concerns on this invention is demonstrated. 14 is a flow chart schematically showing a manufacturing process of the heat exchanger according to the present invention. Referring to this description, the manufacturing process of the heat exchanger according to the present invention first includes a plurality of burrs on one side of a metal sheet having a predetermined size. (31), the heat dissipation press press process process which integrally forms the insertion hole 33 and the condensate flow path 35 is performed, and then the flat tube 40 cut | disconnected to predetermined | prescribed size and the burr 31 of a heat dissipation saw Apply the material (clad) to the part. Then, the flat tube 40 is inserted into the insertion hole 33 of the heat dissipation fin 30 arranged at predetermined intervals, and then assembled. After assembling by assembling the assembly, the heat exchanger according to the present invention is completed by passing the brazing furnace that emits high heat so that the coated material is melted by high heat to naturally fuse each member.

As described above, the heat exchanger according to the present invention utilizes the advantages of the fan-and-tube heat exchanger and the flat tube heat exchanger, so that the heat exchange efficiency is improved, which makes it possible to miniaturize and reduce the weight, and also has an effect suitable for a domestic air conditioner evaporator requiring natural drainage of condensate. have.

The heat exchanger according to the present invention vertically penetrates the heat radiation 휜 to increase the heat transfer area and the heat transfer efficiency at the air side, and the long side in the cross-section is arranged at predetermined intervals in the vertical direction in parallel with the air flow path, thereby minimizing the ventilation resistance, and cooling the air. The condensate generated during the flow flows naturally along the surface of the heat sink.

The present invention is also manufactured by the automatic brazing method in the tunnel conveyor nitrogen furnace, etc. manufacturing cost is low, and the heat transfer efficiency is maximized without the heat transfer resistance due to the gap between the heat generated during expansion and tube and tube for miniaturization, light weight Evaporators may be provided.

Claims (7)

A plurality of flat heat dissipation fans arranged at regular intervals; A plurality of flat tubes coupled to be orthogonal to the flat heat dissipation beam; And a plurality of return tubes installed at both ends of the flat tube to allow the supplied refrigerant to flow in a zigzag fashion. The method of claim 1, The flat heat dissipation fan is made of a thin metal plate having a predetermined width and height, and includes a plurality of long hole-type insertion holes formed at a predetermined distance apart in a vertical direction, and a condensate flow path having a predetermined depth formed close to the long hole-type insertion hole. 휜 and flat tube heat exchanger, characterized in that configured to. The method of claim 1, The flat tube has a flat plate-shaped cross-section of the fan and flat tube heat exchanger, characterized in that a plurality of refrigerant passages are formed in a line by a plurality of partitions formed at predetermined intervals. The method of claim 1, The linton tube has a cross-section similar to that of the flat tube, and the flat tube heat exchanger, characterized in that bent in a U-shape to communicate two adjacent flat tubes. The method according to claim 1, wherein And a plurality of flat heat dissipation fins, a plate tube and a return tube are brazed in a nitrogen atmosphere furnace. A plurality of flat heat dissipation fans arranged at regular intervals; A plurality of flat tubes arranged integrally and orthogonally joined to the flat heat dissipation beam; A plurality of return tubes installed at both ends of the flat tube to allow the refrigerant to flow in a zigzag manner; A refrigerant distributor for uniformly distributing the high pressure liquid refrigerant flowing from the condenser; An expansion device for throttling and expanding the high pressure liquid refrigerant to a pressure and a temperature at which vaporization is possible; An inlet for supplying the expanded refrigerant to the flat tube; An evaporator for an air conditioner using a wet and flat tube heat exchanger, comprising: an outlet for sending a vaporized refrigerant to a compressor after heat exchange is completed. The method of claim 6, Evaporator for air conditioner using a flat tube type heat exchanger, characterized in that it further comprises one or more refrigerant header tube bonded to the flat tube to inject or outflow the refrigerant into the flat tube.