JPS61276674A - Evaporator for air-conditioning - 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 [Field of Industrial Application] The present invention relates to an improvement in a corrugated fin type evaporator that is effective for use in automobile air conditioners and the like.

[Conventional technology]

Conventionally, this type of corrugated fin type evaporator is shown in Fig. 6(a).
), Tb) as shown in its plan view and front view,
Since the expansion valve 16 does not operate stably at low temperatures, it needs to be installed on the upstream side in the air blowing direction, and the refrigerant flows into the flat tube in order to supply more refrigerant to the upstream side of the evaporator in the air blowing direction. It was necessary to let the water flow in from the downstream side. Therefore, in order to achieve the above configuration using piping made of metal pipes, since the piping cannot be bent sharply, the refrigerant leaving the expansion valve 16 as shown in FIG. At the upper central part of the evaporator by pipe A,
The air is guided to the downstream side in the blowing direction through the bent part of the flat tube, and then the pipe A is bent at right angles and guided to the flat tube inlet at the end on the evaporator side, and then bent at right angles again to connect the refrigerant to the inlet side refrigerant distribution pipe. It is formed so that a refrigerant flows into B.

[Problem that the invention seeks to solve]

However, in the conventional structure as described above, piping A
The problem is that the length increases, making the handling complicated, and the number of bends increases during assembly, which increases the number of man-hours.

[Means for solving problems]

Therefore, in order to solve the above-mentioned problems, the present invention integrates a refrigerant passage inside the flat tube that converts the flow direction of the refrigerant flowing from the same direction as the wind flow into the refrigerant inlet part of the flat tube. A refrigerant distribution means is provided.

[Effect]

According to the above configuration, refrigerant flows from the upstream side of the evaporator in the blowing direction by simply brazing the refrigerant distribution means, which has a refrigerant passage integrally formed inside the refrigerant passage for converting the flow direction of the refrigerant in the opposite direction, to the flat tube. can be converted to flow from the downstream side in the direction of air blowing.

〔Effect of the invention〕

Therefore, according to the present invention, the refrigerant led from the expansion valve on the upstream side can be guided to the downstream side and the refrigerant can be flowed from the downstream side to the flat tube inlet without the need for complicated piping. It has the excellent effect of being unnecessary and simple in shape, and also greatly reducing the number of man-hours required for assembly work.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings. Fourth
Figures (a) and (b) show a two-bath corrugated-fin type evaporator 10 that employs the refrigerant distribution means of the present invention, that is, the refrigerant passage consisting of a flat tube is divided into two for the purpose of reducing refrigerant distribution pressure loss, etc. 11 and 12 are a plan view and a front view showing the overall configuration of an evaporator configured to allow refrigerant to flow in parallel, respectively, as shown in the cross section of FIG.
The first and second flat tubes have a structure in which a large number of refrigerant passage holes 13 are arranged in a line, and are manufactured by integral molding by extrusion of a metal with excellent thermal conductivity such as aluminum. A corrugated fin 14 is formed between the walls of the flat tube 11 and 12 bent in a meandering manner to promote heat exchange, and is joined to the flat tube by brazing or the like.

Further, an expansion valve 16 is provided upstream of the evaporator 10 to expand the liquid refrigerant and send it to the evaporator 10 in the form of mist. 18 is
This is a refrigerant distribution pipe for distributing the expanded refrigerant to two evaporation paths, that is, first and second flat tubes 11 and 12, and its detailed structure will be described later. Also, the first and second
The outlet portions 11b and 12b of the flat tube 11.12 are
Inlet portions 19b, 1 of the merging pipe 19, which is a branched refrigerant pipe
9C by brazing.

On the downstream side of the confluence point 19a of the confluence pipe 19, there is a temperature sensing tube 20.
is provided, and in order to adjust the amount of refrigerant supplied from the expansion valve 16 to the evaporator 10 according to the temperature of the gas refrigerant passing through the merging pipework 9, pressure is applied to a diaphragm chamber (not shown) of the expansion valve 16, etc. A pressure transmission pipe 21 is connected thereto.

Next, the structure of the refrigerant distribution pipe 18 will be explained based on the perspective view of FIG. Reference numeral 22 denotes an aluminum pipe portion having a passage A that penetrates in the longitudinal direction and serves as a refrigerant passage, and a passage A that is sealed on the upstream end surface 22d in the air blowing direction. A pipe 24 for supplying the atomized refrigerant discharged from the expansion valve is connected by brazing or the like. This tube part 22 has elongated holes 22b, 22 for connecting flat tubes in its lower surface part 22a, the shape of which is explained in more detail in the plan view and front view of FIGS.
C is provided, and the first and second flat tubes 11
and 12 refrigerant inlet ports are connected by brazing or the like.

23 is an end surface 22.23 of the pipe portion 22 opposite to the end surface 22d to which the pipe 24 is connected. The soldering part e is the end plate part that is airtightly joined by etc., and is made of aluminum like 22, and the third
As the detailed structure is explained in the plan view and front view of FIG. The refrigerant flowing into the flow path A from the piping 24 flows toward the end plate part 23, reverses at the end plate part 23, and flows into the flow path A as shown by the arrow in FIG. The refrigerant is configured to flow in the opposite direction to the flow path and to be distributed into the flow paths A and 1, and the refrigerant is introduced from the downstream side of the first and second flat tubes in the blowing direction.

Next, the operation of the above configuration will be explained. Liquid refrigerant supplied from a refrigerant receiver constituting a refrigeration cycle (not shown) is expanded by the expansion valve 16 and becomes a mist of liquid refrigerant, which flows into the flow path A of the distribution pipe 18 via the pipe 24.

Then, the flow direction is changed by 180° at the end plate part 23, and the first
The refrigerant is distributed into flow paths A and I according to the flow resistance within the second flat tube 11.12. The atomized liquid refrigerant takes heat from the corrugated fins 14 and evaporates while passing through the first and second flat tubes 11 and 12, respectively. At this time, the air to be cooled used for cooling is blown by an air blower, flows through the gaps between the corrugated fins 14, gives heat to the corrugated fins 14, and is cooled. The evaporated gas refrigerant exits the evaporator lO and enters the refrigerant pipe 19.
The fuel enters the water, merges at a merging point 19a, and is supplied to the suction port of a compressor constituting a refrigeration cycle (not shown). Note that the temperature-sensitive tube 20 guides the pressure that changes depending on the temperature of the gas refrigerant exiting the evaporator to the diaphragm chamber of the expansion valve 16 through the pressure transmission pipe 21, and adjusts the valve opening degree according to the movement of the diaphragm. The amount of refrigerant supplied to the evaporator 10 is appropriately adjusted.

As explained above, by adopting the refrigerant distribution pipe 18 of the present invention in a two-bath corrugated-fin type evaporator, if this is not adopted, the upper part of the evaporator as shown in FIGS. It is possible to eliminate the pipe A that had to be installed so as to straddle the pipe, and the assembly does not harm the space due to the protrusion into the pipe. 23 and then connect the piping 24 to the refrigerant inlets of the first and second flat tubes 11 and 12 of the evaporator 10 and to the flow path A, and the bending process of the piping can be kept to a minimum. As a result, work efficiency can be greatly improved.

The present invention is not limited to the first embodiment described above, but can be widely modified.

In the first embodiment described above, the flow path in the refrigerant distribution pipe 18 is configured with three parallel flow paths, and the refrigerant that enters from flow path A is reversed and enters flow path A, the first flow path, and the second flow path. Second flat tube 1
1.12, but channels A and A may be combined into one. For example, if they have a double pipe configuration as shown in Figure 7, the structure of the distribution pipe can be made simpler. It can be made into something.

Furthermore, in the above-mentioned first embodiment, the present invention is applied to a two-pass corrugated-fin type evaporator, but even in the case of a normal one-pass type, a U-shaped passage is used instead of the piping B in Fig. 6. This can be applied by using a distribution pipe with a

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating the shape of the refrigerant distribution pipe 18 of the present invention, and FIG. Figures 3(a) and 3(t)) are a front view and a plan view illustrating the shape of the end plate portion 23, and FIG. 4 is a plan view illustrating the configuration of an evaporator to which the distribution pipe of the present invention is applied. and a front view, FIG. 5 is a cross-sectional view explaining the cross-sectional shape of the flat tube 11 and 12 in FIG. 4, and FIG. 7 are perspective views illustrating the shape of another embodiment of the refrigerant distribution pipe of the present invention. 18...Refrigerant distribution pipe.

Claims (1)

[Claims] In an evaporator formed by bending a flat tube having refrigerant passage holes therein into a meandering shape and connecting corrugated fins between adjacent walls of the meandering tube, the refrigerant inlet of the flat tube is provided with a wind flow. An evaporator for air conditioning, characterized in that it is provided with a refrigerant distribution means in which a refrigerant passage is integrally formed inside the refrigerant passage for converting the flow of refrigerant flowing from the same direction into the opposite direction.