JPH043862A - Layered type evaporator - Google Patents

Abstract

PURPOSE:To form a water draining clearance having a predetermined height between end surfaces of fins and a tank part and improve a water draining characteristics near the end parts of fins by a method wherein an outer surface of a flat pipe is formed with outward projected fin-engating projection and then the end parts of the fins are engaged with the engaging projections. CONSTITUTION:Each of the groups of fin engaging projections 17 supports upper end surfaces and lower end surfaces of fins 2 at a state in which tube elements 1 and corrugated fins 2 are alternatively piled up. Both end surfaces of the fins 2 hold an upper tank 8 and a lower tank 9 in a predetermined clearance and then a water draining clearance 25 is formed. At an evaporator, a heat exchanging is carried out with air passing through the air flow clearance including fins 2 formed between the elements 1. In this case, since the evaporator retrieves heat of air, dew water is also formed on a lower surface of the upper tank part 8 and an upper surface of a lower tank 9. The dew water at these parts are smoothly flowed out from there without accumulating at the water drain clearance 25.

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-shaped 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.

Conventional technology In recent years, stacked type evaporators have come into the spotlight in place of conventional serpentine type evaporators, which have advantages such as being able to easily follow load fluctuations and having relatively rigid performance relative to volume. It has become.

As shown in FIGS. 8 and 9, for example, this stacked evaporator has a pair of molded plates (51) (51) made of pressed metal such as aluminum, and has a flat tube as a refrigerant passage. A plurality of plate-shaped tube elements (55) are formed to have tank parts (53) (54) for storing heat exchange medium at both upper and lower ends of the part (52).
・With corrugated fins (56) arranged between them and outside of the outermost tube element, the tank parts are interconnected and stacked in the left and right direction, and the whole is joined and integrated by brazing. This is what I did.

In this evaporator, the refrigerant flows in as a mist from the refrigerant inlet (58), flows through the internal refrigerant circuit, and flows through the refrigerant outlet (58).
59) to the outside of the vessel, the corrugated fin (
58) The heat of the air flowing through the air circulation gap is removed and it gradually turns into gas.

In this stacked evaporator, for the purpose of improving heat exchange efficiency, the tube element (55) has a large number of inclined ribs (60) on the inner surface, as shown in FIG. 9, for example.
- is manufactured using two molded plates (51) (51) that are formed protrudingly by press processing, and when the image molded plates (51) (51) are combined, the ribs of one plate are connected to the ribs of the other plate. The ribs are brought into opposing contact with each other in an intersecting manner, thereby disturbing the flow of refrigerant in the refrigerant circuit, and improving heat transfer efficiency based on the disturbance effect.

Problems to be Solved by the Invention By the way, since the evaporator removes the heat held by the air passing through the air circulation gap, it exerts a condensing effect on the air, and as a result, the surface of the corrugated fin (56) and the tube Condensation occurs on the surface of the element (55).

This condensed water is blown away by the air passing through the air circulation gap, causing a phenomenon called water splashing, but in the stacked evaporator using the tube element (55) with ribs (60) as described above, , condensed water tends to flow downward through the drainage passage created between the tube element (55) and the corrugated fin (5B).

However, in the conventional evaporator as described above, since the end face of the full gate fin (56) is in contact with or in close proximity to the tank parts (53) and (54), condensed water is formed between the two due to capillary action. There is a problem in that the dew water absorbs and retains water, causing the accumulation of condensed water, and the condensed water is blown away by the air passing through the air circulation gap, causing a water splash phenomenon.

It is an object of the present invention to provide a stacked evaporator that can solve the above-mentioned conventional drawbacks, improve drainage performance near the ends of the fins, and thereby prevent the water splash phenomenon. .

Means for Solving the Problems In order to achieve the above object, the present invention provides a method in which a plurality of plate-like tube elements each having a bulging tank portion at both ends of a flat tube portion connect the tank portions so as to communicate with each other. In a stacked evaporator arranged in a left-right stacked state and with fins arranged between tube elements, an outwardly protruding fin engagement protrusion is formed on an outer surface of the flat tube part,
Abstract: A stacked evaporator characterized in that a drainage gap of a predetermined height is formed between the end face of the fin and the tank part by engaging the end part of the fin with the engaging protrusion. shall be.

Function: In the above-mentioned stacked evaporator, a drainage gap of a predetermined height is formed between the end face of the fin and the tank part, so that the condensed water generated during heat exchange can flow through the gap without stagnation. I will do it.

Moreover, by forming outwardly protruding fin engaging protrusions on the outer surface of the flat tube part and engaging the ends of the fins with the engaging protrusions, a drainage gap is formed between the flat tube part and the tank part. Because of this, when the evaporator components are temporarily assembled before being joined and integrated by brazing, etc., the end faces of the fins are accurately positioned without misalignment, and the quality of the accurate height is ensured. A high drainage gap is formed.

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-like tube elements vertically stacked in the left-right direction, (2) indicates the space between adjacent tube elements (1)...
and corrugated fins arranged on the outside of the outermost tube element, (3) is the outermost corrugated fin (
2) is the side plate placed on the outside, (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) of the tank parts (8) and (9) are connected to each other and communicated with each other through refrigerant flow openings (11) provided on the end faces of each tank part. ing.

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 molding plate (13) 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.
Define the positions of the bulges (16) (16) formed in an outward bulge shape to constitute the upper and lower tank parts (8) and (9), and the upper and lower end surfaces of the corrugated fins (2). A fin engaging protrusion (17) formed in an outwardly protruding shape for
)... is 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 this 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). .

In addition, as shown in FIG.
10) is formed so that the inner width (W3) is the width between the brackets, and both side walls (21) of the area between the brackets (21)
from both side walls in the flat tube part (10) to the tank part (8) (
9)' is formed to extend straight and continuously toward both side walls of the inner refrigerant passage (20a), thereby forming the outermost refrigerant passage (20a) of the plurality of refrigerant passages (20) as described above.
All the passages including 20a) communicate straight into the tank parts (8) and (9).

On the other hand, the upper and lower bulges (1B) of the molding plate (13)
(1B) is formed in an elliptical shape as shown in FIGS. 1, 4, and 5, and the refrigerant flow opening (11
)... are provided in parallel. A recess (22) is provided at a position between each opening (11) on the upper surface of the upper bulge (16) and the lower surface of the lower bulge (I6). As a result, an additional joint surface (23) is provided in the corresponding portion to enlarge the area of the peripheral end joint surface (14), thereby increasing the strength of the tank portions (8) and (9) against refrigerant pressure. It is intended to be improved.

Incidentally, in conventional stacked evaporators, the peripheral end joint surface located above the upper tank part is widened upward, and the peripheral end joint surface located below the lower tank part is widened downward. By doing so, the joint area was expanded, thereby increasing the strength of the tank part, which had the disadvantage of increasing the size of the evaporator in the vertical direction, but as mentioned above, four parts (22) By increasing the strength of the tank parts (8) and (9) by providing ... and expanding the joint area inward of the bulging part (16),
The stacked evaporator can be made smaller. Furthermore, by forming the concave portions (22) in the bulging portions (1B) (1B), an effect of reducing the internal volume of the tank portions (8) (9) can be produced.

In addition, in order to sufficiently increase the bonding area in the tank parts (8) and (9) and increase the strength, the bulging part (16
) The number of refrigerant flow openings (11) provided in
In addition, the depth (Di) of the fourth part (22) is within the same range as that of the upper circumferential joint surface (14) of the tank part (8).
) is desirably set to 0.5 to 2.0 times the height (hl). Further, the bottom of the recess (22) is preferably formed into a curved surface with a radius of lInIn or more.

The fin engaging protrusions (17) are positioned slightly inward from the upper and lower bulges (16), and are located between the ribs (j5) and on the outermost side. They are formed in parallel on each of the outer sides of the ribs.

Each of the upper and lower groups of these fin engaging protrusions (17)...
In a temporarily assembled state in which tube elements (1) and corrugated fins (2) are laminated in an alternating arrangement, the upper and lower end surfaces of the corrugated fins (2) are supported, and the corrugated fins ( Both end surfaces of 2) function to maintain a predetermined distance from the upper and lower tank parts (8) and (9). In this pre-assembled state, each component of the evaporator is joined by joint brazing, etc., and the upper and lower end surfaces of the corrugated fin of the evaporator and the upper and lower tank parts (8) (9) are joined together. ) A drainage gap (25) is formed between the two.

In the evaporator, the refrigerant flows from the inlet pipe (6) to the outlet pipe (7).
), corrugated fins (2) formed between the tube elements (1)...
It exchanges heat with the air flowing through the air circulation gap containing the air.

At that time, in order for the evaporator to remove heat from this air, the lower surface of the upper tank part (8)... and the lower tank part (9)...
・・Condensation also forms on the top surface.

However, between the upper end surface of the corrugated fin (2)... and the upper tank section (8)... and between the lower end surface of the corrugated fin (2)... and the lower tank section (9)... As mentioned above, there is a drainage gap (25) between the It flows out smoothly from there without being stagnated, and therefore it is possible to prevent the occurrence of water splashing phenomenon caused by air flowing in the front and rear directions.

In particular, the lower surface of the corrugated fin (2) and the lower tank part (9)
), the drainage gap (25) is formed between the tube element (c) and the corrugated fin (2).
It is possible to smoothly drain the condensed water flowing downward due to its own weight to the outside through the drainage passage (2B) (see Fig. 6) formed by the presence of ribs (15) between the becomes.

The height (hl) of the drainage gap (25) may be set to a value that allows the condensed water to drain smoothly, for example, it may be set in the range of 1 to 10 degrees. is preferred. If it is less than 1 fin, there is a tendency for the drainage performance of condensed water to decrease, and if it exceeds 10 fins, the drainage gap (25)
However, this is undesirable because it becomes an escape route for the air flowing in the front and rear directions of the evaporator and tends to reduce heat exchange performance.

In addition, the particularly preferable length of the drainage gap (25) is 2 to 4.
It's relevant. In other words, it is preferable to set the length within a range of half a pitch of the corrugated fin (2) or the length thereof plus two pitches.

In addition, regarding the number, shape, etc. of the fin engagement protrusions (17), the end face of the corrugated fin (2) can be stably fixed to the tank part (
8) Various forms may be adopted as long as they can be maintained apart from (9). Furthermore, the drainage gap (25) may be formed only between the lower end surface of the corrugated fin (2) and the lower tank part (9), or the drainage gap (25) may be formed only between the lower end surface of the corrugated fin (2) and the lower tank part (9). and the upper tank (8).

As shown in FIGS. 1 and 6, the side plate (3) has a large number of parallel grooves (28) extending in the vertical direction on its inner surface.
) is placed outside the outermost corrugated fin (2), and a grooved line (2) is placed between it and the corrugated fin (2).
8) Vertical drainage passage (29) caused by...
・It is assumed that this will be formed. As a result, condensed water that forms between the outermost tube element (1) and the side plate (3) during heat exchange is removed from the drainage passage (
29)..., and the drainage performance in this air circulation gap is improved. Further, as shown in FIGS. 1 and 7, a lower tank portion (9) of the tube element (1) is attached to the lower end of the side plate (3).
) is formed in a bent manner so as to face and contact the end face of the tank support (30), and the four strips (28) are continuously formed on this tank support (30), thereby effectively discharging condensed water. , furthermore, the lower tank part (9
) is intended to increase the strength of the

Effects of the Invention As described above, in the stacked evaporator of the present invention, a drainage gap of a predetermined height is formed between the end face of the fin and the tank portion, so that condensation generated during heat exchange is eliminated. Water flows through such gaps without stagnation, which improves drainage performance and reduces water retention, effectively preventing water splashing caused by air flowing back and forth through the evaporator. be able to.

Moreover, by forming outwardly protruding fin engaging protrusions on the outer surface of the flat tube part and engaging the ends of the fins with the engaging protrusions, a drainage gap is formed between the flat tube part and the tank part. Because of this, the end faces of the fins can be accurately positioned without misalignment when the evaporator components are temporarily assembled before being integrated by brazing, etc., and accurate height adjustment can be achieved. It becomes possible to form a drainage gap with high quality.

[Brief explanation of drawings]

Figures 1 to 7 show an embodiment of the stacked evaporator according to the present invention. Figure 1 is a perspective view showing the side plate, corrugated fins, and tube elements 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.
FIG. 7 is a partially enlarged front view of the evaporator. FIGS. 8 and 9 show a conventional evaporator, with FIG. 8 being a front view of the evaporator, and FIG. 9 being a perspective view showing the side plate, corrugated fins, and tube element in a separated and disassembled state. (1)...Tube element, (2)...Corrugate fin, (8)(9)...Tank part, (10)...
...Flat tube part, (17) ...Fin engaging protrusion, (25
)...Gap for drainage. Patent applicant: Honda Motor Co., Ltd. Figure 2

Claims (1)

[Claims] A plurality of plate-like tube elements each having a bulging tank portion at both ends of a flat tube portion are arranged in a left-right direction stacked state with the tank portions connected to each other, and fins are placed between the tube elements. In the stacked evaporator, an outwardly protruding fin engagement protrusion is formed on the outer surface of the flat tube part, and the end of the fin is engaged with the engagement protrusion, so that the end face of the fin is A stacked evaporator characterized in that a drainage gap of a predetermined height is formed between the and the tank part.