KR100901629B1 - Evaporator - Google Patents

Abstract

An evaporator is provided to prevent the freezing and brazing bonding fault by easily discharging the condensed water from a lower header. An evaporator comprises an upper header(2), a lower header(4), tubes(22,24) combined between the headers and a heat exchange fin(26) inserted into the tubes. The lower header is consisting of independent a plurality of pipes. A plurality of pipes(14) forms a depression part by closely adhering and a tube is inserted each pipe row. A condensed water discharging part(28) is welded on the cave-in part to the longitudinal direction of the lower header. A groove(28a) supporting the lower part of the heat exchange fin is formed on the condensed water discharging part. The air passes the width direction either side of the lower header through the groove.

Description

Evaporator

The present invention relates to an evaporator, and more particularly to an evaporator that is easy to process condensate.

The heat exchanger has a flow path through which a working fluid flows, and is used for various air-conditioning devices. The heat exchanger is used in various air-conditioning devices, and various types of evaporators, condensers, radiators, and heater cores are used according to conditions of use. .

Among the heat exchangers, the evaporator functions to heat exchange the cool refrigerant and the surrounding warm air therein. In the heat exchange process, as the temperature decreases, the saturation amount of the water vapor decreases as the temperature decreases. This condensate must be discharged quickly in the evaporator. If condensate remains in the evaporator, it may increase resistance on the air side or freeze on the surface. An evaporator is disclosed in which the lower tank portion has various structures for discharging the condensate.

As a conventional evaporator, Korean Patent Laid-Open Publication No. 1999-0012681 has a header plate having a separation part formed with a hole between a first header part and a second header part, coupled to a header tank, so that condensate flows through the hole. . Korean Laid-Open Patent Publication No. 2006-0029179 has a groove formed in the surface of the header plate between adjacent tubes along the length direction of the header plate such that condensate flows down the width of the lower header along the groove. Japanese Laid-Open Patent Publication No. 2004-053132 has a structure in which a drain hole is formed between a header plate and a tube so as to be recessed toward the inside of the lower header and toward the gravity direction so as to guide water accumulated between the tubes to the downward side. . Japanese Laid-Open Patent Publication No. 2004-108671 has a lower header spaced a predetermined distance, and a condensate support plate is provided between the lower end of the corrugated pin and the lower header, so that the condensate does not contact the lower header so that the lower header is excessively cooled. The condensate is designed to prevent freezing.

However, in the conventional evaporator, Korean Patent Laid-Open Publication No. 1999-0012681 has a problem in that the first header part and the second header part are separated by the separating part, so that the width (thickness) of the evaporator is increased to occupy a lot of installation space.

In Korean Laid-Open Patent No. 2006-0029179, there is a problem in that a cladding material of a brazing joint portion with a tube flows down into a groove when brazing, resulting in a poor brazing joint.

In Japanese Patent Laid-Open No. 2004-053132, condensed water continues to accumulate in a portion recessed toward the inner side of the lower header surface. In order to prevent the frost of the evaporator, most of the air conditioners for automobiles install a thermistor immediately after the air flow downstream of the evaporator to detect the air temperature passing through the heat exchange core part, and to obtain a predetermined temperature (3 ° C. to 4 ° C.). The on / off control which interrupts a compressor operation is performed so that it may become (degree. C.). Therefore, the thermistor's detection temperature and the lower header's temperature are different and the lower header's temperature is excessively cooled due to the installation position of the thermistor or irregularity of the detection temperature, and the delay of the refrigeration cycle with respect to the operation interruption of the thermistor or compressor. In this case, the temperature of the lower header becomes lower than the detection temperature of the thermistor. In this state, if the compressor is repeatedly operated / stopped to control the temperature of the evaporator, the condensate accumulated between the corrugated fins starts to freeze slowly from the lower end of the corrugated fins close to the lower header. If the freezing to the vicinity of the thermistor is installed, the air volume of the air cooled in the core portion is lowered, and the cold air on the surface of the evaporator does not reach the thermistor, thereby preventing normal temperature control.

In Japanese Patent Laid-Open No. 2004-108671, although the lower header is spaced at a predetermined interval, the gap is narrow and the groove is also narrow and small, so that it is difficult to discharge a large amount of condensate at once, and the condensate is accumulated in the depression between the header and the header. There is the same problem as Japanese Patent Laid-Open No. 2004-053132.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an evaporator which easily discharges condensate from the lower header without increasing the size (thickness) to prevent freezing and prevent brazing failure. There is.

In the present invention, a tube is coupled to form a plurality of rows in the width direction between the upper header and the lower header to form a plurality of rows of the refrigerant flow passage, the heat exchanger fin is inserted between the tubes, the lower header of each row A plurality of independent pipes to which the tube is inserted and coupled are formed in close contact, and a recess formed in close contact with each pipe is formed to support the lower end of the heat exchange fin and to easily allow air to pass through both sides in the width direction of the lower header. The condensate discharge member is characterized in that it is welded along the longitudinal direction of the lower header.

The condensate discharge member is a rod formed with the groove at predetermined intervals along the longitudinal direction.

Integral caps are coupled to both ends of the lower header, and the condensate discharge member is fitted and welded to the integral cap.

According to the evaporator according to the present invention, condensed water is easily discharged from the lower header without increasing the size (thickness), thereby preventing freezing, preventing brazing failure, and improving cooling performance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following embodiment, an example of an evaporator in which a tube is coupled in two rows in a width direction of a header between an upper header and a lower header so as to form two rows of refrigerant flow passages is described. And, while the header is described as an example of a structure consisting of an extruded pipe, the pipe may be made of a sealing tube (pipe manufactured by Roll Forming to form a pipe by rolling a plate).

Figure 1 is an exploded perspective view of the evaporator to which the present invention is applied, Figure 2 is a cross-sectional view of the lower tank portion of FIG. As shown, the upper header 2 and the lower header 4 consist of two independent extrusion pipes 12, 12 ′ 14, 14 ′ in which two rows of tubes 22, 24 are fitted and fitted respectively. The sides of the extruded pipes 12, 12 ′ 14, 14 ′ are in close contact with each other so that the longitudinal ends of the extruded pipes are fixed by the integral caps 16, 18, 19. Heat exchange fins 26 (corrugated fins, etc.) are inserted and welded between the tubes 22 and 24.

A coolant communication hole 12b in which the flow direction of the coolant is switched is formed at a side surface in which the extruded pipes 12 and 12 'of the upper header 2 closely contact each other. In the extruded pipes 12, 12 ′ 14, 14 ′, tube insertion holes are formed at predetermined intervals along the longitudinal direction of the extruded pipe in the tube engagement surface.

The depressions formed by closely contacting the extruded pipes 14 and 14 ′ of the lower header 4 support the lower end of the heat exchange fin 26 while allowing air to pass easily in both width directions of the lower header 4. A condensate discharge member 28 having a groove 28a is welded along the longitudinal direction of the lower header 4. The evaporator of the present invention is welded by brazing each part in the furnace after pre-assembly, the condensate discharge member 28 is welded at the time of brazing by the welding material (C) filled in the depression of the lower header (4).

The condensate discharge member 28 is a rod in which the groove 28a is formed on the trademark surface at predetermined intervals along the longitudinal direction. In addition, a locking jaw 19a is formed in the middle of the upper surface of the integrated cap 19, and both ends of the condensate discharge member 28 are fitted into the integrated cap 19 to be easily assembled and welded to the locking jaw so as not to be shaken. . The end of the condensate discharge member 28 may be inserted into the locking jaw (19a) and bent to secure the temporary assembly.

On the other hand, as shown in Figure 3, the condensate discharge member 128 may be made of various cross-sectional shape and the air passage groove (128a). The condensate discharge member may be modified in various shapes to facilitate the discharge of the condensate.

The air passages and grooves 28a and 128a of the condensate discharge members 28 and 128 do not block the air between the lower header 4 and the heat exchange fins 26, thereby preventing the deterioration of the cooling performance of the evaporator. . The air passage grooves 28a and 128a are continuously or irregularly formed so that the upper surface of the condensate discharge members 28 and 128 is serrated. The condensate discharge members 28 and 128 are made of the same material (aluminum material) as the lower header. Due to the welding of the condensate discharge members 28 and 128, the lower header 4 has no depression, so that the condensate is easily discharged without accumulation.

The condensate discharge means 28 and 128 support the lower end of the heat exchange fin 26 so that the lower end of the heat exchange fin 26 is aligned in a line such that the lower end of the heat exchange fin 26 does not touch the brand surface of the lower header 4. Since the 26 may be extended to the lower header 4 side as compared with the related art, the heat transfer area of the heat exchange fin 26 may be increased, thereby increasing the cooling performance of the evaporator.

In addition, the condensate discharge member 28 and 128 may not come into contact with the side surfaces of the tubes 22 and 24 so that a poor bonding between the lower header 4 and the tubes 22 and 24 may occur during brazing. It is desirable to have.

1 is an exploded perspective view showing an evaporator to which the present invention is applied;

2 is a cross-sectional view of the lower tank portion of FIG.

3 is a cross-sectional view of a lower tank portion of an evaporator according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

2: upper header 4: lower header

12,12 ', 14,14': Extruded pipes 16, 18, 19: Integral cap

19a: jaw 22, 24: tube

26: heat exchange fins 28, 128: condensate discharge member

28a, 128a: home

Claims (4)

In the evaporator in which a tube is formed in a plurality of rows in the width direction between the upper header and the lower header to form a plurality of rows of refrigerant flow passages, and heat exchange fins are inserted between the tubes. The lower header is made of a plurality of independent pipes in which the tubes of each row are fitted to be coupled in close contact, The concave portion formed in close contact with each pipe is formed with a condensate discharge member having a groove formed therein so as to support the lower end of the heat exchange fin and easily pass air in both width directions of the lower header along the longitudinal direction of the lower header. Characterized by evaporator. The method according to claim 1, The condensate discharge member is an evaporator, characterized in that the rod is formed with a groove at a predetermined interval along the longitudinal direction. The method according to claim 1, An integrated cap is coupled to both ends of the lower header, and the condensed water discharge member is inserted into the integrated cap and welded thereto. The method according to any one of claims 1 to 3, And the condensate discharge member is not in contact with the side surface of the tube so as to prevent a poor connection between the lower header and the tube, which may occur during brazing.

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