JPH0325101Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an evaporator used in car coolers and the like.

Conventional technology Conventional evaporators for car coolers were developed in 1982.
As shown in Publication No. 36574, a corrugated fin is interposed between each straight pipe section of a serpentine flat heat exchange tube made of extruded aluminum having a plurality of refrigerant passages having the same cross-sectional area, and Air is forced to flow perpendicularly to the refrigerant passage, and condensation water drainage grooves extending along the length of the flat heat exchange tubes are provided in parallel on both sides of the tube. A separate collecting condensation water drain groove is provided on the upper surface of the lower bent portion and is perpendicular to the condensation water drain groove.

Problems to be Solved by the Invention The conventional evaporator described above has the following three problems.

First, since the flat heat exchange tubes are made of extruded aluminum, there has been a limit to the reduction in the weight of the evaporator.

Second, although the refrigerant evaporates more easily on the windward side and less evaporates on the leeward side, the cross-sectional areas of the plurality of refrigerant passages are all the same, resulting in poor heat exchange efficiency.

Thirdly, since the condensation water drainage grooves on both sides of the flat heat exchange tube extend in the extrusion direction of the aluminum extruded section, they can be obtained at the same time when forming the tube, but the condensation water drainage grooves on both sides of the flat heat exchange tube can be obtained at the same time when the tube is formed. The collective condensation water drain groove located in is perpendicular to the extrusion direction, so
This cannot be obtained without further groove processing after extrusion molding.

The purpose of this invention is to provide an evaporator that solves the above three problems all at once.

Means for Solving the Problems This invention has corrugated fins interposed between each vertical straight pipe section of a meandering heat exchange tube having a plurality of refrigerant passages, and which blows air perpendicularly to the refrigerant passages by forced air blowing. In order to achieve the above-mentioned purpose in the evaporator through which water flows, the pipe body is provided with first and second condensation water drain grooves in parallel, each having a cross-sectional shape and extending in the length direction thereof. It is constructed by joining second metal plates to each other, and the groove spacing of both grooves is gradually decreased from the windward side to the leeward side, and the first condensation water drain groove is located at the bottom of the second condensation water drain groove. By bringing the outer surfaces into close contact with each other, a plurality of refrigerant passages whose cross-sectional areas are successively smaller from the windward side to the leeward side are formed, and a first condensation water is formed on the upper surface of each lower bent part of the pipe body in the meandering configuration. The discharge groove is cut off to form a grooveless portion, and a communication portion is formed below the grooveless portion to connect adjacent refrigerant passages.

According to the evaporator of this invention, the tube body includes first and second metal plates each having first and second condensation water drain grooves in parallel in a cross-sectional shape and extending in the length direction thereof. Since they are constructed by joining them together, their wall thickness can be made thinner than those made of conventional aluminum extrusion shapes.

In addition, the pipe body is configured as described above, and the groove spacing of both grooves is gradually decreased from the windward side to the leeward side, and the bottom outer surfaces of the first condensation water drain groove and the second condensation water drain groove are connected to each other. are brought into close contact with each other to form a plurality of refrigerant passages whose cross-sectional area gradually decreases from the windward side to the leeward side. A plurality of refrigerant passages having sequentially different cross-sectional areas corresponding to the above are simultaneously obtained by joining the first metal plate and the second metal plate.

Furthermore, since the first condensation water drain groove is cut off at the upper surface of each lower bent portion of the tube body in the meandering configuration, and is made into a grooveless portion, the upper surface of each lower bent portion of the tube body itself is connected to the first condensed water drain groove. It serves as a collection condensation water drainage channel that collects condensation water that flows down the ground and directs it in the direction of the wind flow.

Moreover, by forming the grooveless portion, a communication portion is inevitably formed below the grooveless portion that connects adjacent refrigerant passages, and the refrigerants in each refrigerant passage mix through the communication portion. .

Embodiment Next, an embodiment of this invention will be described in detail based on the drawings.

The illustrated evaporator 1 includes a plurality of refrigerant passages 4A, 4.
For car coolers, in which a corrugated fin 3 is interposed between each vertical straight pipe part 2a of a meandering heat exchange tube body 2 having B, 4C, and the wind A is forced to flow perpendicularly to the refrigerant passage 4. It is an evaporator,
The pipe body 2 mutually joins first and second metal plates 5 and 6, each of which has first and second condensation water discharge grooves 7 and 8 arranged in parallel in a cross-sectional shape and extending in the length direction thereof. The grooves 7 and 8 are configured so that the groove spacing is gradually decreased from the windward side to the leeward side, and the first condensation water discharge groove 7 and the second condensation water discharge groove 8 have their bottom outer surfaces in close contact with each other. A plurality of refrigerant passages 4 whose cross-sectional areas are gradually reduced from the windward side to the leeward side by
A, 4B, and 4C are formed, and the first condensation water discharge groove 7 is cut off at the upper surface of each lower bent portion 2b of the tube body 2 in the meandering form, forming a grooveless portion 9, and the grooveless portion 9 is formed. A communication part 1 that connects the refrigerant passages 4A, 4B, and 4C that are adjacent to each other in the lower part.
0 is formed.

The first and second metal plates 6 and 7 both have a thickness
The corrugated fin 3 is made of an aluminum brazing sheet with a thickness of about 0.5 mm, and is soldered to the tube body 2, and is provided with a large number of louvers 11. Refrigerant passage 4A,
In order to increase the pressure resistance and further improve the internal heat transfer coefficient, inner fins 12 made of corrugated thin aluminum plates are disposed within the fins 4B and 4C.

In the above embodiment, the wind A generated by the blower is blown in the direction of the arrow.

The water that has condensed on the outer surface of the tube body 2 of the evaporator 1 flows down to the upper surface of the corrugated fins 3, and the water that has condensed on the upper surface of the corrugated fins 3 becomes the flowing water due to the forced air flow. Together, they are moved to the leeward side of the fins 3, but on the way, they flow down through the slits in the louver 11 or flow down along the condensed water drain grooves 7 and 8 in the tube body 2.

Of course, the water condensed on the outer surface of the tube body 2 near the condensation water discharge grooves 7 and 8 does not flow down onto the upper surface of the corrugated fin 3, but directly flows down along these grooves 7 and 8.

Further, water condensed near the leeward edge of the tube 2 and water condensed near the leeward edge of the corrugated fin 3 both flow down along the leeward edge of the meandering tube 2.

The condensed water that has flowed down to the lower bent part 2b of the pipe body 2 in this way falls from the pipe body 2 as it is below the bent part 2b and is discharged below the evaporator 1. Since there is a grooveless part 9 on the upper side of the part 2b, the flowing water from the first condensation water discharge groove 7 is collected there, and is blown to the leeward edge by forced air, and from there is discharged to the outside of the evaporator 1. It is quickly discharged.

On the other hand, a communication portion 1 connecting adjacent refrigerant passages 4A, 4B, and 4C below the grooveless portion 9
The refrigerants in each refrigerant passage 4A, 4B, and 4C mix well through the refrigerant passages 4A, 4B, and 4C.

Effects of the invention According to the evaporator of this invention, the wall thickness of the tube body can be made thinner than that of the conventional evaporator made of extruded aluminum, so that the weight of the evaporator can be reduced.

Further, the first and second condensed water drain grooves and a plurality of refrigerant passages having different cross-sectional areas in order to correspond to the relative evaporation amount of the refrigerant are connected to the first metal plate and the second condensation water drain groove.
Since they can be obtained at the same time by joining metal plates, it is possible to easily obtain an evaporator with good discharge of condensed water and good heat exchange efficiency.

In addition, the upper surface of each lower bent part of the pipe body in the meandering configuration itself plays the role of a collecting condensation water drain that collects the condensed water that has flowed down the first condensed water drain and flows it in the direction of the wind flow. This is advantageous in terms of manufacturing since there is no need to take the trouble of forming the collective condensation water drainage groove after extrusion molding.

Furthermore, since the refrigerant in each refrigerant passage mixes well through the communication part that connects adjacent refrigerant passages formed below the grooveless part, the cross-sectional areas of the refrigerant passages are made different as described above. In combination with this, the heat exchange efficiency can be further improved, and since the connecting portion is naturally obtained by providing the grooveless portion, this point is also advantageous in terms of manufacturing.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention: Fig. 1 is a side view, Fig. 2 is a partially enlarged perspective view, Fig. 3 is an enlarged sectional view taken along the line of Fig. 1, and Fig. 4 is a drawing of Fig. 1. It is an enlarged sectional view along the - line. DESCRIPTION OF SYMBOLS 1... Evaporator, 2... Heat exchange tube body, 2a... Straight pipe part, 2b... Lower bent part, 3... Corrugated
Fin, 4A, 4B, 4C... Refrigerant passage, 5...
First metal plate, 6...Second metal plate, 7...First condensation water drain groove, 8...Second condensation water drain groove, 9...Non-grooved portion, 10...Connection portion.

Claims (1)

[Scope of utility model registration request] A corrugated fin 3 is interposed between each vertical straight pipe portion 2a of the meandering heat exchange tube body 2 having a plurality of refrigerant passages 4A, 4B, and 4C, and wind A is perpendicular to the refrigerant passage 4 by forced air blowing. In the flowing evaporator, the tube body 2 includes first and second metal plates 5, each having first and second condensed water discharge grooves 7, 8 arranged in parallel in a cross-sectional shape and extending in the length direction thereof.
It is constructed by joining 6 to each other,
Both grooves 7 and 8 have a groove interval that is gradually reduced from the windward side to the leeward side, and the outer bottom surfaces of the first condensation water discharge groove 7 and the second condensation water discharge groove 8 are brought into close contact with each other, so that the cross-sectional area A plurality of refrigerant passages 4A, 4B, and 4C are formed in which the refrigerant passages are made smaller in order from the windward side to the leeward side.
An evaporator in which a condensed water discharge groove 7 is cut off to form a grooveless portion 9, and a communication portion 10 is formed below the grooveless portion 9 to connect adjacent refrigerant passages 4A, 4B, and 4C.