JPS59137771A - Evaporator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an evaporator used in a cooling cycle such as an air conditioner for an automobile.

An example of an evaporator incorporated in a conventional automobile air conditioner is a deformed tube evaporator as shown in FIG. This irregular-shaped tube evaporator 1 has a single flat irregular-shaped tube 3 with a plurality of refrigerant passages 2 formed therein, formed in a meandering shape, and fins f between the outer surfaces of the irregular-shaped tube 3 formed in the meandering shape. An inlet header pipe 4 and an outlet header pipe 5 are connected to both ends of the irregularly shaped tube 3 so as to communicate with the refrigerant passages 2, respectively. The refrigerant that has been adiabatically expanded by the expansion valve from the inlet header pipe 4 flows into the two groups of refrigerant passages of the irregularly shaped tubes 3.
While the refrigerant flows through the two groups of refrigerant passages formed in a meandering shape, it absorbs heat from the air flowing between the fins f, evaporates, cools the air with the heat of evaporation, and transfers the evaporated gas refrigerant to the outlet side. It is fed through a header pipe 5 to a compressor (not shown).

However, since this conventional evaporator is molded using a single flat, irregularly shaped tube 3, some of the condensed water generated inside the evaporator 1 falls between the louvers of the fins, and the rest falls on the fins. It moves along both ends near the tube to the downstream end of this irregularly shaped tube 3, where it falls into the water for the first time. For this reason, the drainage of condensed water is poor, and the condensed water tends to splash downstream of the airflow. Various measures have been taken to prevent this splashing, such as installing wire mesh, and installing bridges to allow water to fall into the irregularly shaped pipes themselves. The molding etc. must be carried out.

The present invention has been devised in view of the above-mentioned problems, and aims to provide an evaporator that improves the drainage performance of the evaporator itself.The present invention is characterized by the fact that a plurality of pipes each having a circular cross section are arranged in a row. , in that a refrigerant passage is formed.

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2 to 6 are diagrams showing one embodiment of the present invention. In forming the refrigerant passage 2 described above, this evaporator 10 does not use a flat plate-shaped irregularly shaped tube,
It is formed by arranging a plurality of pipes P each having a circular cross section.

Simply meander forming such a pipe P to form both header pipes 4.
, 5, the condensed water will fall through the gap created between the pipes P, so it is possible to improve the drainage performance of condensed water and the water splash prevention function to a greater extent than with conventional pipes. This eliminates the need for installing a wire mesh to prevent splashing water or forming a bridge part on the tube itself as in the past.However, in the present invention, in order to further improve such functions and simplify manufacturing, the following configuration is used. It has become.

First, FIG. 3 is a cross-sectional view taken along line III--III in FIG. 2, showing the alignment of the pipes P of this evaporator 10.

That is, this pipe P forms a gap S between each other in the vertical straight portion, so that air can pass through these 7412 spaces, and condensed water can also fall along this pipe P.

In addition, among the pipes P, the pipe located at the most downstream end in the air flow direction has one end in contact with the end of the corrugated fin f, so that the air passage is expanded so as not to create resistance to the air flow. A linear or arcuate end face 11 is formed that extends downstream in the air flow direction so that the condensed water that has flowed along the corrugated fins f flows through this end face 1.
It is designed to fall along 1.

Figure 4 is a cross-sectional view taken along the mV-mV line in Figure 2, showing both ends of this pipe P (connection to the header). The end T of this pipe P is formed to have a rectangular cross section because if it were to be connected to both the header pipes 4 and 5, the sealing performance at the time of connection would be poor.

FIG. 5 is a sectional view taken along the line ■-■ in FIG. 2, and shows the upper vent portion B1 of the pipe P. This pipe P is formed into a meandering shape from a straight section Pa and upper and lower bent parts B. If this pipe P has a circular cross section, the cross-sectional shape of the bent part B will inevitably change due to the bending process of the pipe P. becomes an ellipse.

Therefore, the long axis of the pipe P, which has an elliptical cross section, is
If the outer circumferential surfaces of the sides are aligned so as to be in contact with each other as shown in FIG. 5, the gap S will be created between the straight line portions Pa having a normal circular cross section.

However, if the pipes P are in contact with each other not only in the upper vent part B1 but also in the lower vent part B, the condensed water accumulated in the lower vent part B2 will fall onto the lower casing of the cooler unit. There is a possibility that it will not.

Therefore, in the present invention, as shown in FIG. 6, a wedge-shaped member, for example, is interposed between the pipes, and the pipes are press-worked to form water passages 12 between the pipes.

Next, the action will be explained.

To form the evaporator 10 without trenches, a pipe having a circular cross section and a predetermined length is bent using a pipe bender or the like.

Due to this curvature, the upper and lower vent portions B, B2 of the pipe have a flat elliptical cross section as shown in FIG. Next, the refrigerant inlet and outlet ends are processed and formed into a rectangular cross section.

The pipes in this state are aligned so that only the upper vent portions B1 are in contact with the end surfaces in the longitudinal direction of the ellipse, but the other lower vent portions B are aligned with a wedge-shaped member interposed between the pipes.

With this wedge-shaped member interposed therein, the lower vent portion B is pressurized by a press. This pressurization creates a dent in a part of the side surface of the bulging pipe, which becomes the water passage 12.

A corrugated fin f is interposed between the linear portions Pa of the pipe P formed in this manner, and header pipes 4 or 5 are attached to both ends and brazing is performed to complete the evaporator 10 shown in FIG. 2.

When the evaporator 10 configured as described above is set in a predetermined cooling cycle system and air is allowed to flow into the evaporator itself from the direction of the arrow in FIG. 2, this air flows between the corrugated fins f and between the pipes P. The moisture in this air gradually condenses and increases as it goes downstream.

When the generated condensed water reaches a predetermined amount, it immediately falls downward through the pipes P, and is not carried downstream by the wind. That is, in this evaporator 10, condensed water is almost never blown away by the air flow in the downwind direction.

The water flowing down along the straight line part Pa of this pipe P falls onto the casing (not shown) of this evaporator 10 from the water passage 12 established in the lower vent part B2 of this pipe P, and flows out of the vehicle cabin from the drain pipe. 7- It will be expelled.

If the water splash prevention effect becomes extremely high in this way, it will inevitably be necessary to apply water splash prevention measures such as conventional water splash prevention methods (6) or molding the irregularly shaped tube itself to form the bridge section. There are no more guns, and the price of the evaporator itself becomes cheaper.

As is clear from the above description, according to the present invention, the refrigerant passage formed in a normal irregularly shaped tube is formed by a pipe with a circular cross section. Even if you do this, a drainage channel will be created between the pipes) and the corrugated fins, allowing for smooth drainage of condensed water.If a gap is formed between these pipes, air can pass through this gap and improve cooling performance. Not only is this improved, but the fall of condensed water is also much better.

Furthermore, if the upper and lower vent portions are connected to each other by brazing while remaining flat ellipses, a gap will naturally be created between the pipes in the straight portion in the middle, improving drainage performance.

Especially in this case, if a water passage is established in the lower vent part, 8
− This drainage performance will be further improved.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a conventional evaporator, and FIG. 2 is an overall perspective view showing an embodiment of an evaporator according to the present invention.
Figures 3 to 6 are the m-■ line in Figure 2, the IV-IV line,
It is a sectional view along the vv line and the vr-v+ line. 2... Refrigerant passage, 4, 5... Header pipe, 10.
... Evaporator, 11... Straight end surface, 12...
Water passage, f...corrugated fin, S...gap, P
... Pipe, Pa... Straight section, B... Bent section, T... End. Patent applicant: Japan Radiator Co., Ltd.

Claims (6)

[Claims] (1) A vertical straight part of a liquid pipe having a plurality of refrigerant passages is formed in a meandering manner so that the upper and lower pent parts communicate with each other, and corrugated fins are interposed on the surface of this liquid pipe,
An evaporator in which an inlet header and an outlet header are attached to both ends of the liquid pipe, and the refrigerant passage is formed by arranging a plurality of pipes each having a circular cross section. (2) The evaporator according to claim 1, wherein the pipes form a predetermined gap between them. (3) The evaporator according to claim 1 or 2, wherein the pipes of the upper pent portion are in close contact with each other. (4) The evaporator according to any one of claims 1 to 3, wherein the pipes of the lower pent portion form a through hole for condensed water to fall between them. (5) The most downstream end of the pipe in the air flow direction protrudes from the end of the corrugated fin toward the downstream side in the air flow direction. The evaporator mentioned in one of the above. (6) The pipe located at the most downstream position in the air flow direction has a linear end face that has one end in contact with the end of the fin and extends downstream in the air flow direction so as not to create resistance to the air flow. An evaporator according to any one of claims 1 to 5, formed of: