JP2553951Y2 - Stacked evaporator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A laminated evaporator according to the present invention is incorporated in an air conditioner for automobiles to cool air for air conditioning in a vehicle interior.

[0002]

2. Description of the Related Art An air conditioner for a vehicle incorporates an evaporator for evaporating a refrigerant inside and cooling air flowing outside.

[0003] Such an evaporator incorporated in an air conditioner for automobiles has been disclosed in, for example, Japanese Unexamined Patent Publication No.
There is known a so-called stacked evaporator in which a plurality of metal plates are stacked on each other, as described in JP-798-798.

As shown in FIG. 8, this laminated evaporator is constituted by laminating a plurality of elements 2, 2 each of which is composed of two metal plates 1, 1 in the middle in combination. I have. As shown in FIGS. 8 to 10, each metal plate 1, 1 has a flat portion 3 surrounding the entire circumference of each metal plate 1,
, A shallow first concave portion 4 formed in a U-shape, and deep second and third concave portions 5, 6 formed at both ends of the first concave portion 4.
And through holes 7 and 8 formed in the center of the second and third concave portions 5 and 6. Also, a plurality of convex portions 9 are provided inside the first concave portion 4 so as to disturb the flow of the refrigerant inside the first concave portion 4.

[0005] A plurality of elements 2 and 2 constituting the laminated evaporator are formed by assembling two metal plates 1 each having the above-mentioned shape, and abutting flat portions 3 of each metal plate 1 to form a middle portion. The U-shaped portion surrounded by the first recess 4 is defined as a flat tube portion 12 through which the refrigerant flows, and the portion surrounded by the second and third recesses 5 and 6 is defined as an inlet-side tank or an outlet. It functions as a part of the side tank.

As shown in FIG. 8, a plurality of the elements 2, 2 as described above are used.
The outer surfaces of the third concave portions 5 and 6 are laminated by abutting each other,
An inlet pipe 10 is provided in one of the pair of spaces formed by the second and third recesses 5 and 6, and an outlet pipe 11 is provided in the other space.
Are connected respectively.

In a state where the plurality of elements 2 and 2 are stacked in this way, corrugated fins 13 and 13 are sandwiched between the flat tubes 12 and 12 of the adjacent elements 2 and 2 to form a core. The heat exchange between the air flowing between the adjacent flat tube portions 12 and the refrigerant flowing inside the flat tube portions 12 is preferably performed.

Further, outside the fins 13 attached to the outer surfaces of the elements 2 located at the left and right ends, side plates 14 are respectively provided outside the fins 13 so that the fins 13 are provided.
13 is pressed down on the outer surface of each of the elements 2 and 2.

Since the laminated evaporator is constructed and constructed as described above, when a gas-liquid mixed-phase refrigerant is sent from the inlet pipe 10 to one space functioning as an inlet-side tank,
The coolant flows through the flat tube portions 12 of the plurality of elements 2 while the fins 1 provided outside the flat tube portions 12 are provided.
After evaporating by performing heat exchange with air flowing between 3 and 13, the water is sent to the other space functioning as an outlet-side tank and discharged through the outlet pipe 11.

[0010] Japanese Patent Application Laid-Open No. 61-27496 discloses that
As shown in FIGS. 11 to 13, a stacked evaporator of a tank separate type is disclosed. In the case of this laminated type evaporator, a pair of protruding portions 15, 1
A U-shaped concave portion 17 is formed on one surface of the metal plate 16 on which the 5 is formed, with both ends of the concave portion 17 continuing to the end edges of the pair of protrusions 15, 15. A large number of projections 18 are formed inside the concave portion 17 to disturb the flow of the refrigerant flowing inside the return flow path 19 formed by the concave portion 17, and heat exchange between the refrigerant and the metal plate 16. Is performed efficiently.

In the case of a laminated evaporator of a separate tank type, which is manufactured using such a metal plate 16, the metal plates 16, 16 are formed as a pair, and the recesses 17 are opposed to each other. By being overlapped in the middle and joined to each other in a liquid-tight manner, a U-shaped folded flow path 19 and a pair of joints 26, 26 located at both ends of the flow path 19 and protruding from the edge are formed. Are the elements 25 and 25 having

The joints 26, 26 of the plurality of elements 25, 25 are inserted into slit-shaped connection holes 21, 21 formed on the side surfaces of the pair of tanks 20, 20, respectively. The outer peripheral surfaces of the portions 26, 26 and the inner peripheral edges of the connection holes 21, 21 are brazed to each other in a liquid-tight manner. Each of the tanks 20, 20 is formed by combining a seat plate 22 and a tank body 23 as shown in FIG.
21 is formed on the bottom surface of the seat plate 22. At the same time, the fins 13, 13 are provided between the adjacent elements 25, 25.
(See FIG. 8) to form the core portion.

The inside of one of the pair of tanks 20, 20 is divided by a partition wall 24 fixed at an intermediate portion into an inlet chamber 27 and an outlet chamber 28. A fluid inlet 29 is provided on the side, and a fluid outlet 30 is provided on the outlet chamber 28 side.

In the case of the laminated evaporator of the separate tank type configured as described above, when the refrigerant is fed from the fluid feed port 29, the refrigerant passes through the plurality of return flow paths 19 and then passes through the fluid outlet port 30. More outflow.

In the case of such a stacked evaporator having a separate tank, side plates are provided outside the fins attached to the outer surfaces of the elements 25, 25 located at the left and right ends, respectively. 13 for each of the above elements 2
5 and 25.

[0016]

However, in the case of a laminated evaporator configured and operated as described above, FIGS.
Even if it is a tank integrated type as shown in FIG. 10, or a tank separate type as shown in FIGS.
The following problems occur.

That is, the fins 13, 13 located at both ends
To element 2, 2 (FIG. 8) or element 25 located at both ends.
The ends of the side plates 14, 14 (FIG. 8) for holding the outer surfaces of the side plates 25 (FIG. 12) are bent into a crank shape as shown in FIG. 3, and the ends 14a are formed as shown in FIG. ,
The metal plates 1 and 16 forming the elements 2 and 25 are brought into contact with the outer surface ends.

On the other hand, concave grooves 31 for improving the rigidity of the metal plates 1 and 16 are formed at the left and right ends of the outer surfaces of the metal plates 1 and 16, respectively. The metal plates 1 and 16 are put on the ends of the metal plates 1 and 16 in a state of covering a part of the concave groove 31. For this reason, a minute space surrounded by the concave groove 31 and the end 14a of the side plate 14 was present at both left and right outer surfaces of the metal plates 1 and 16.

During operation of the air conditioner for automobiles, condensed water generated by condensing water vapor contained in the air adheres to the surface of the laminated evaporator, and the condensed water is generated by capillary action. , Tend to accumulate in the minute space.

On the other hand, when the operation of the air conditioner for a vehicle is continuously performed and the amount of air sent to the stacked evaporator is small (the wind speed is low), the condensed water adhering to the surface of the stacked evaporator is reduced. May freeze.

When the condensed water accumulated in the minute space freezes, a large force is applied to the metal plates 1, 16 and the side plates 14 surrounding the minute space due to an increase in volume accompanying the freezing. When the operation and the stop of the air conditioner for a vehicle are repeatedly performed and the large force is repeatedly applied, the metal plates 1 and 16 and the side plate 14 gradually become fatigued and may be broken at last.

Japanese Unexamined Utility Model Publication No. 61-119077 discloses a technique for forming a water distribution passage at the end of a side plate. However, it is impossible to discharge condensed water accumulated in the minute space due to a capillary phenomenon. .

The laminated evaporator of the present invention solves the above-mentioned disadvantages.

[0024]

The laminated evaporator according to the present invention comprises a metal plate formed with a concave portion on one side and concave grooves on the left and right ends of the other surface, similarly to the above-described laminated evaporator. By making one set, overlapping each other in the middle with the concave portions facing each other and joining them in a liquid-tight manner, an element having a flat flow path on the inside is formed, and a plurality of elements are replaced by adjacent elements. A side plate is provided outside each of the fins shorter than the element, having a core portion which is configured by being overlapped with fins provided therebetween, and attached to the outer surfaces of the elements located at both ends of the core portion. And a portion bent in a crank shape at the end of the side plate is brought into contact with the outer surface of the element.

Further, in the laminated evaporator of the present invention, the width of the portion of the side plate which is in contact with the outer surface of the element at the end portion is slightly shorter than the width of the plurality of elements. It is characterized in that the end of the side plate does not cover the concave groove.

[0026]

According to the laminated evaporator of the present invention configured as described above, the operation itself when performing heat exchange between the refrigerant flowing inside the evaporator and the air flowing outside the evaporator is the same as the conventional laminated evaporator described above. It is the same as in the case of the mold evaporator.

However, in the case of the laminated evaporator of the present invention, the width of the end of the side plate is small, and the end does not cover the groove on the outer surface of the element. Does not form a minute space surrounding the periphery.

Therefore, condensed water does not accumulate in the minute space, and damage to the laminated evaporator due to freezing of the condensed water is prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the laminated evaporator of the present invention is as follows, except that the width of the end 14a of the side plate 14 is reduced.
The above-mentioned Japanese Patent Application Laid-Open No. 62-798 or Japanese Patent Application Laid-Open
Since it is the same as that of the laminated evaporator described in Japanese Patent No. 27496, a duplicate description will be omitted, and the features of the present invention will be described below.

The side plates 14 for holding the fins 13 and 13 located at both ends of the core portion, which are formed by alternately laminating the elements 2 and 25 (see FIGS. 8 and 12) and the fins 13 and 13 (see FIG. 8), from outside. Is formed by bending an aluminum thin plate, as shown in FIGS.

One end of the side plate 14 (FIG. 5,
6) is bent into a crank shape, and the main portion 14b and the end portion 14a are connected by a step portion 14c having a height corresponding to the thickness of the fin 13.

The width W of the main portion 14b is substantially equal to the width (depth) of the elements 2, 25 and the fin 13, but the width w of the end 14a is
25, by the amount of the grooves 31 located at the left and right ends of the outer surface,
It is smaller than this (W> w).

As described above, the width of the end portion 14a is smaller than the width of the elements 2 and 25.
As in the case of the conventional side plate, as shown in FIGS. 1 and 2, the end 14a is brought into contact with the outer side of the end of the element 2, 25, and one side of the end 14a is , 25
And the fins 13 are pressed down toward the outer surfaces of the elements 2, 25 located at the ends of the core portion.

In this state, in the laminated evaporator of the present invention, the width w of the end portion 14a of the side plate 14 is smaller than the width size (ΔW) of the elements 2 and 25, so that the end portion 14a Does not cover the concave grooves 31 provided at the left and right ends of the outer surfaces of the elements 2 and 25. Therefore, a small space surrounded by the concave groove 31 and the end portion 14a of the side plate 14 is not formed.

Therefore, the condensed water does not accumulate in the minute space, and the damage of the laminated evaporator due to the freezing of the condensed water is prevented.

In FIGS. 1 to 4, reference numerals 32 and 32 denote fins 13 and 13 (FIG. 8) which are held between the respective elements 2 and 25 (see FIGS. 8 and 11 to 13). In order to
This is a bent edge formed on the edge of the metal plates 1 and 16 constituting each of the elements 2 and 25. The bent edges 32, 32
Are conventionally known and are not the gist of the present invention.

[0037]

[Effects of the Invention] The laminated evaporator of the present invention is constructed and operates as described above, however, since excessive stress is not applied to each component based on the freezing of the condensed water accumulated in the minute space, The durability is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention and corresponding to a portion A in FIG. 8;

FIG. 2 is a view taken in the direction of arrow B in FIG. 1, showing the assembled state.

FIG. 3 is a view similar to FIG. 1, showing a conventional example.

FIG. 4 is a view taken in the direction of arrow C in FIG. 3, showing the assembled state.

FIG. 5 is a side view of the side plate showing the embodiment of the present invention.

FIG. 6 is a view seen from the right side of FIG. 5;

FIG. 7 is a view as seen from above in FIG. 5;

FIG. 8 is a front view showing a first example of a conventional laminated evaporator.

FIG. 9 is a side view of a metal plate constituting the evaporator.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a partially exploded perspective view showing a second example of a conventional evaporator.

FIG. 12 is a bottom view showing the assembled state.

FIG. 13 is a side view of the same.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Metal plate 2 Element 3 Flat part 4 First concave part 5 Second concave part 6 Third concave part 7 Through hole 8 Through hole 9 Convex part 10 Inlet pipe 11 Outlet pipe 12 Flat tube part 13 Fin 14 Side plate 14a End part 14b Main part 14c Step part 15 Projection part 16 Metal plate 17 Depression 18 Projection 19 Folding flow path 20 Tank 21 Connection hole 22 Seat plate 23 Tank body 24 Partition 25 Element 26 Joint 27 Inlet chamber 28 Outlet chamber 29 Fluid inlet 30 Fluid outlet 31 Groove 32 Bending edge

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal plate formed with a concave portion on one side and concave grooves on both left and right ends of the other surface, each of which is a set of two metal plates,
By overlapping in the middle while the recesses are opposed to each other and joining them in a liquid-tight manner, an element having a flat flow path inside is formed, and a plurality of elements, fins between adjacent elements are formed. A side plate is provided outside each of the fins shorter than the element, which has a core portion configured by being overlapped in the provided state, and attached to the outer surface of the element located at both ends of the core portion, and the side plate is provided. In the laminated evaporator in which the portion bent in a crank shape at the end of the plate is brought into contact with the outer surface of the element, the width of the part that comes into contact with the outer surface of the element at the end of the side plate, A stacked evaporator, wherein the end of the side plate does not cover the groove by making the width slightly shorter than the width of the plurality of elements.