JPH03230064A - Laminated type evaporator - Google Patents

Abstract

PURPOSE:To reduce a pressure loss and improve a heat exchanging performance by a method wherein ribs of molding plate are arranged in parallel to each other toward a flowing direction of coolant and a width in a tank is formed substantially in the same width in the flat pipe. CONSTITUTION:A tube element 1 has an upper tank 8 and a lower tank 9 at both ends. It has further a flat pipe 10 communicating with both tanks at its longitudinal intermediate part. Coolant flowed from a coolant inlet pipe 6 through a header 4 is flowed in a zig-zag form in each of the groups of tube elements and is flowed out of an evaporator from an outlet pipe 7 through an outlet header 5. Ribs 15 of the molding plate 13 are arranged in parallel toward a flowing direction of the coolant. During a heat exchanging operation, the coolant smoothly flows in a coolant passage in the tube element 1 and then a uniform and efficient heat exchanging operation is carried out. A width W2 in the tanks 8, 9 and a width W3 in the flat pipe 10 are made substantially equal to each other so as to reduce a passage resistance and then a flow dividing performance from the tanks 8, 9 to each of the coolant passages 20 and a heat exchanging efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a stacked evaporator used for car air conditioners and other applications, in which a plurality of plate-like tube elements each having a refrigerant passage include fins between them. The present invention relates to evaporators of a stacked type with air circulation gaps interposed therebetween.

Prior Art In this type of stacked evaporator, the refrigerant passages of each tube element are connected to form a refrigerant circuit from the refrigerant inlet to the refrigerant outlet. While flowing through the circuit, the refrigerant exchanges heat with the air flowing through the air circulation gap, gradually becoming gasified, and flowing out of the refrigerant through the refrigerant outlet.

As shown in FIG. 7, the above-mentioned tube element conventionally has an inlet tank part (51) and an outlet tank part (52) at one end, so that the refrigerant flowing from the inlet tank part (51) is transferred to the other end. Widely used are those equipped with a flat tube 1 (55) having a refrigerant circuit in which the refrigerant flows toward the end and then makes a U-turn toward the outlet tank (52).

In addition, in order to disturb the flow of refrigerant within the flat tube part (55) and improve heat transfer efficiency based on the disturb effect,
The tube element is made by stacking two dish-shaped molded plates (54) each having a large number of protruding ribs (53) on the inner surface facing each other so that the ribs (53) are on the inside, and joining them at the peripheral end. It is produced by being made. Furthermore, the ribs (53) are provided obliquely with respect to the flow direction of the refrigerant, and when both molded plates (54) are overlapped, both molded plates (54) are provided as shown by solid lines and broken lines in FIG. The ribs (53) of the plate (54) are joined to each other in a crossing manner.

Problems to be Solved by the Invention However, as described above, when the refrigerant circuit in the flat tube section (55) is formed in a U-turn shape, the refrigerant tends to flow unevenly in the circuit, and as a result, substantial transmission is reduced. A problem arises in that the thermal area is reduced.

Moreover, since the ribs (53) are provided obliquely with respect to the flow direction of the refrigerant and are joined to each other in a crossing manner, the following problems occur. In other words, in the tube element near the inlet side of the evaporator, the refrigerant is violently disturbed and heat exchange is performed efficiently, but as it gets closer to the outlet side, the ratio of gas occupies increases and the heat exchange efficiency decreases. Despite this, the refrigerant is violently disturbed by the ribs (70) in the tube element near the outlet side as well as in the inlet side, so the pressure loss only increases. Although heat exchange is concentrated and efficient on the inlet side, the efficiency is poor on the outlet side, so the heat exchange efficiency of the heat exchanger as a whole is not very good, and the pressure loss is large. It had become.

The present invention has been made in view of these problems, and an object of the present invention is to provide a stacked evaporator with low pressure loss and high heat exchange performance.

Means for Solving the Problems In order to achieve the above object, the present invention includes: A pair of molded plates each having a plurality of protruding ribs formed on the inner surface are stacked one on top of the other in a facing manner with the ribs on the inside, and are joined at their peripheral edges. As a result, a plate-like tube element having a flat tube portion is formed, and in a stacked evaporator in which a plurality of these tube elements are stacked in the thickness direction with fins interposed between them, the tube The element is formed to have a bulging tank part at both ends of a flat tube part, and the tank parts of each tube element are connected to each other in a state of communication, while the ribs are parallel to the flow direction of the refrigerant. The molded plates are arranged in a direction perpendicular to the flow direction, and when the molded plates are overlapped, the ribs of the other molded plate are located between the ribs of the other molded plate, and the tip of each rib is formed. The parts are joined to the flat parts of the opposing molded plates, so that a plurality of refrigerant passages extending straight between both tank parts are arranged in parallel in the flat tube part, and further, the width of the tank part is equal to that of the flat pipe part. The width is approximately the same as or larger than the width, and both side walls of the area between the two are continuous in such a manner that they extend straight or outward from both side walls in the flat tube part toward both side walls in the tank part. The gist of the stacked evaporator is that it is formed in an elongated shape so that all of the plurality of refrigerant passages, including the outermost refrigerant passage, are communicated straight into the tank part.

Function: In the stacked evaporator mentioned above, the tube element is formed to have a bulging tank section at both ends of the flat tube section, so that the refrigerant is not allowed to flow inside the element like a type that makes a U-turn. There will be no deviation in the flow within the element, causing a substantial reduction in the heat transfer area, and pressure loss will also be small.

Furthermore, since the ribs of the molded plate are provided parallel to the flow direction of the refrigerant, the refrigerant flows smoothly within the refrigerant circuit without being disturbed. Therefore, in addition to reducing pressure loss, heat is exchanged evenly from the refrigerant inlet side to the outlet side, improving overall heat exchange performance.

Furthermore, a plurality of ribs are arranged in a row in a direction perpendicular to the flow direction, and when the molding plates are stacked one on top of the other, the ribs of the other molding plate are located between the ribs of one molding plate, and the tip of each rib is are joined to the flat parts of the opposing molded plates, increasing the heat transfer area of the refrigerant and improving heat exchange performance, as well as making it possible to firmly join the molded plates and improving pressure resistance. Ru.

In addition, the width within the tank portion is approximately the same as or larger than the width within the flat tube portion, and both side walls of the area between the two extend from both side walls within the flat tube portion toward both side walls within the tank portion. All of the plurality of refrigerant passages, including the outermost refrigerant passage, are formed to extend continuously in a straight line or in an outwardly expanding manner, so that all of the plurality of refrigerant passages, including the outermost refrigerant passage, communicate straight into the tank portion. The refrigerant in the tank part can also flow into the outer refrigerant passage under low passage resistance, and the refrigerant in this passage can also flow into the tank part under low passage resistance, so that the overall passage resistance is reduced,
Furthermore, the performance of dividing the refrigerant from the tank portion into each refrigerant passage is improved, and the heat exchange efficiency is improved.

EXAMPLE Hereinafter, an example will be described in which the stacked evaporator of the present invention is applied to an evaporator for a car cooler made of aluminum or its alloy.

In Figures 1 to 3, (1) indicates a plurality of plate-shaped tube elements stacked vertically and in the left-right direction, and (2) indicates the space between adjacent tube elements (1) and the outermost side. (3) is the side plate placed outside the outermost corrugated fin (2), (4) is the inlet header, (5) is the outlet header, (6) is the Inlet pipe, (
7) is the outlet pipe. These evaporator components are integrally joined by brazing or the like.

The tube element (1) has bulging upper and lower tank parts (8) and (9) at both ends in the length direction, and a flat tube part (10) that communicates both tank parts in the middle part in the length direction. have. And each tube element (1)...
The upper and lower tank parts (8) and (9) are connected to each other, and communicate with each other through refrigerant flow openings (11) provided on the end faces of each tank part. has been done.

Furthermore, from the refrigerant inlet side, the 5th and 6th, the 14th and 15th upper tank parts (8), and the 10th and 11th lower tank parts (9). The mutual refrigerant flow openings (11) are closed, so that the refrigerant flowing from the refrigerant inlet pipe (6) through the header (4) changes direction through each tube element group and flows in a meandering manner. Outlet pipe (7) via outlet side header (5)
This is assumed to flow out of the evaporator.

The tube element (1) has two dish-shaped molded plates (13) (13) connected to their peripheral end joint surfaces (14).
) In (14), they are stacked facing each other, and the brazing is formed by integrating them. Note that this molded plate (I3) is formed by press working, and its material is a plating sheet in which both sides of a core material are clad with a brazing material.

The molded plate (13) has ribs (15) formed to protrude inward to improve heat conduction efficiency.
In order to constitute the upper and lower tank parts (8) and (9), bulging parts (1B) (1B) formed in an outwardly bulging shape are provided.

As shown in FIGS. 4 to 6, the ribs (15) are unevenly distributed on the negative side edge of the molding plate (13) in the flow direction of the refrigerant, that is, the molding plate (13).
) are provided at predetermined intervals over substantially the entire length thereof in parallel with the length direction of the molded plates (13) (1
3) are overlapped to form one molded plate (13).
) rib (15)... and the other molded plate (13)
The ribs (15) of the opposing molding plate (13) are arranged alternately, and the tip of each rib (15) is connected to the plane between the ribs (15) of the opposing molding plate (13). Department (
19). With such a configuration, a plurality of refrigerant passages (20) extending straight from the upper tank part (8) toward the lower tank part (9) are formed in the tube element (1). It is said that

In addition, in order to ensure the cross-sectional area of the refrigerant passage as wide as possible, the width (Wl) of the rib (15) is 2 to 2 times the thickness (tl) of the molded plate (13), as shown in FIG.
It is preferable to set the range to 4 times.

In addition, as shown in FIG.
10) are formed so that their widths (W3) are substantially the same, and both side walls (21) of the area between the two (21)
However, the tank part (8) (
The outermost refrigerant passage (20a) (20a) of the plurality of refrigerant passages (20) as described above is formed so as to extend straight and continuously toward both side walls of the refrigerant passage (20).
All passages including 0a) communicate straight into the tank parts (8) and (9).

In the above evaporator, the refrigerant flows from the inlet pipe (6) to the outlet pipe (7).
The corrugated fins (2) formed between the tube elements (1)...
) at both the upper and lower ends of the tube element (1).
) (9), and the ribs (15) of the molded plate (13) are provided parallel to the flow direction of the refrigerant, so that during heat exchange, the refrigerant flows through the tube element ( 1) The refrigerant flows smoothly through the internal refrigerant passage without drifting or being disturbed.
Heat exchange is performed evenly and efficiently through the entire refrigerant passage.

Moreover, the ribs (15) of the opposing forming plates (13) (13) are arranged alternately in a direction perpendicular to the refrigerant flow direction, and the tip of each rib (15) is connected to the opposing forming plate. Since the tube element (19) is abutted to the flat part (19), there is no risk of poor bonding due to mutual misalignment of the plates, unlike when the tips of the ribs are abutted to each other. Assembling work can be carried out easily, yet a laminated evaporator can be manufactured that has tube elements with excellent strength in which the image forming plates are reliably joined to each other. Moreover, by adopting such a structure, a large heat transfer area for the refrigerant can be ensured, and the heat exchange efficiency can be improved.

In addition, as described above, the tube element (1) has a width (W2) in the tank portions (8) and (9) and a flat tube portion (1).
0) is formed so that the width (W3) in the inside is substantially the same,
In addition, both side walls (21) (21) in the area between the two are connected from both side walls in the flat tube part (10) to the tank parts (8) (9).
) is formed so as to extend straight and continuously toward both side walls of the refrigerant passages (20
All passages including a) are designed to communicate straight into the tank parts (8) and (9).

Therefore, the outermost refrigerant passage (20a) (20a
), the refrigerant in the tank part (8) can flow under low passage resistance, and the refrigerant in the refrigerant passage (
20a) (20a) flows into the tank part (9) under the same low passage resistance, so that the passage resistance as a whole can be reduced, and furthermore, the passage resistance from the tank parts (8) and (9) can be reduced. The performance of dividing the refrigerant into each passage (20) is improved, and the heat exchange efficiency can be improved.

Effects of the Invention As described above, the present invention is characterized in that the tube element is formed to have bulging tank portions at both ends of the flat tube portion, and the ribs of the molded plate are provided parallel to the flow direction of the refrigerant. During heat exchange, the refrigerant flows smoothly within the tube element without drifting or being disturbed. Therefore, heat is exchanged evenly and efficiently through all the refrigerant passages, thereby improving the heat exchange performance of the evaporator as a whole.

Moreover, a plurality of ribs are arranged in a row in a direction perpendicular to the flow direction, and when the molding plates are stacked one on top of the other, the ribs of the other molding plate are located between the ribs of one molding plate, and the tip of each rib is Since it is joined to the flat parts of the opposing molded plates, it is possible to eliminate the risk of joint failure due to plate misalignment, which occurs when joining the tip ends of ribs, and the assembly work can be carried out roughly. is possible,
Still, it is possible to provide a stacked evaporator having tube elements with excellent strength, in which the image forming plates are reliably joined to each other. Moreover, by adopting such a structure, a large heat transfer area for the refrigerant can be secured,
As a result, it is possible to improve heat exchange efficiency.

In addition, the width within the tank portion is approximately the same as or larger than the width within the flat tube portion, and both side walls of the area between the two extend from both side walls within the flat tube portion toward both side walls within the tank portion. By being formed in a continuous manner in a straight or outwardly expanding manner,
Since all of the plurality of refrigerant passages, including the outermost refrigerant passage, are communicated straight into the tank part, the refrigerant in the tank part can also flow into the outermost refrigerant passage under low passage resistance. At the same time, the refrigerant in these passages will flow into the tank section under similarly low passage resistance, so that the passage resistance as a whole can be reduced, and furthermore, the refrigerant from the tank section to each refrigerant passage can be reduced. Diversion performance is improved, and heat exchange efficiency can be improved.

[Brief explanation of drawings]

Figures 1 to 6 show a positional example of the stacked evaporator of the present invention. Figure 1 is a perspective view showing the side plate, corrugated fin, and tube element in a separated and disassembled state, and Figure 2 is an evaporator. Fig. 3 is a plan view of the evaporator, Fig. 4 is a plan view of the tube element, Fig. 5 is a plan view of the inner surface of the molding plate, and Fig. 6 is a diagram VI-V of Fig. 2.
It is an I line sectional view. FIG. 7 is a plan view of the inner surface of a molded plate that is a tube element component of a conventional evaporator. (1)...Tube element, (2)...Corrugate fin, (8)(9)...Tank part, (10)...
...Flat tube part, (13) ... Molded plate, (14)
... Peripheral joint surface, (15) ... Rib, (19) ...
・Plane part, (20)... Refrigerant passage, (20a)...
outermost refrigerant passage. Figure 7 above

Claims (1)

[Claims] A plate having a flat tube portion is obtained by stacking a pair of molded plates each having a plurality of protruding ribs on the inner surface facing each other with the ribs inside and joining them at their peripheral ends. In a stacked evaporator in which a plurality of tube elements are formed and stacked in the thickness direction with fins interposed between them, the tube elements are arranged at both ends of the flat tube section. The tank portions of each tube element are formed to have a bulging tank portion, and the tank portions of each tube element are connected to each other in a communicating state, while the ribs are formed parallel to the flow direction of the refrigerant and When the molded plates are arranged in a row in a direction perpendicular to the above direction, and the molded plates are stacked one on top of the other, the ribs of the other molded plate are located between the ribs of one molded plate, and the tip of each rib is aligned with the plane of the opposing molded plate. By being joined to the flat tube section, a plurality of refrigerant passages extending straight between both tank sections are arranged in parallel within the flat tube section, and further, the width inside the tank section is approximately the same as or larger than the width inside the flat tube section. At the same time, both side walls of the area between the two are formed to extend continuously from both side walls in the flat tube part to both side walls in the tank part in a straight or outwardly expanding manner. A stacked evaporator, characterized in that all of the plurality of refrigerant passages, including the outermost refrigerant passage, are communicated straight into the tank portion.