JPH08291989A - Laminate type heat exchanger - Google Patents

Abstract

PURPOSE: To make the communicating air hole effective for passage as large as possible in area in a refrigerant evaporator having in each constituent plate a communicating air hole by which air in each joined body of plates flows from one body to another. CONSTITUTION: In each of plates 100 communicating air holes 108, 109 are punched and flat, oblong ribs 102a, 102b are formed peripherally around the communicating air holes 108, 109 respectively. When a pair of plates 100 are joined to form their joined body, their oblong ribs 102a, 102b are put in contact correspondingly between the two plates. As a result, the joined body of plates, for example, does not allow a projecting piece to be fitted at the communicating air holes 108, 109 so that, compared with communicating holes fitted with projecting pieces, the communicating air holes 108, 109 effective for passage can be made larger in area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger, and is particularly effective when used for a laminated refrigerant evaporator.

[0002]

2. Description of the Related Art As a conventional refrigerant evaporator, for example, Japanese Patent Laid-Open No.
The one disclosed in Japanese Patent Laid-Open No. 305275 is known. As shown in FIG. 10, the plate 100 of this evaporator has a U-shaped passage forming recess 101 that forms a refrigerant passage, and a recess that is deeper than the recess 101 and has a circular shape. A first tank forming recess 104 and a second tank forming recess 105 having the communication holes 106 and 107 are formed.

Then, the evaporator 6 as shown in FIG. 3 is formed by stacking a plurality of bonded bodies which are formed by pairing the plates 100 and facing each other. In this evaporator 6, the first tank forming recess 104 is formed.
The inlet tank, the second tank forming hollow portion 105 constitute an outlet tank, and the passage forming hollow portion 101 constitutes a tube.

Further, as shown in FIG. 3, in the evaporator 6, fins 12 for promoting heat exchange between a refrigerant and air are provided between a plurality of the above-mentioned joined bodies and an adjacent joined body.
3 is provided, and side plates 131 and 132 are provided at both ends of the evaporator 6. An inlet pipe 121 is connected to the inlet tank, and an outlet pipe 122 is connected to the outlet tank.

[0005]

In the refrigerant evaporator having the above-described structure, the distribution of the refrigerant amount distributed to each tube may be biased depending on the conditions of the refrigeration cycle. In this case, there is a difference in the ability to cool the air between the above-mentioned joined bodies of the evaporator, and as a result, the temperature distribution of the air passing through the evaporator becomes uneven. In this way, if the temperature distribution of the blown air that has passed through the evaporator is uneven, there is a problem that the warm blown air and the cold blown air are mixed to generate a white mist.

Therefore, the present inventors have found that the cause of the above-mentioned problem is that the plate is formed by one plate in the first place. Until the air flowing through it has finished passing through the evaporator,
We paid attention to the fact that it is impossible to mix with the air flowing between another bonded body and the adjacent bonded body. Therefore, in order to solve the above-mentioned causes, the present inventors
By providing an air communication hole through which the air flowing between the joints communicates with each other, the heat of the warm air among the air flowing between the joints will naturally flow to the cool air side through the air communication holes. Came to the idea of moving to.

By the way, Japanese Utility Model Publication No. 6-39248 discloses an evaporator in which a plate is formed with a hole having the same function as the air communication hole. However, since the present invention has a technical problem of facilitating positioning when joining the plates, even if the holes are formed in each plate, one of the plates is formed. A projection piece is formed, and a means for fitting the projection piece into the hole of the other plate is adopted.

In this case, since the protruding piece is fitted in the hole, the area of the air passage formed by the hole is reduced by the protruding piece. This naturally causes a problem that the heat exchange efficiency of the air flowing between the joints is reduced, and the effect of preventing the occurrence of the white mist is lowered. Therefore, in view of the above problems, the present invention relates to a stacked heat exchanger in which each plate is formed with an air communication hole for communicating the air flowing between the bonded bodies of the plates,
By improving the heat exchange efficiency of the air members between the joints, the air communication hole is set in a state in which something like the protrusion for reducing the air passage area of the air communication hole is not fitted, As a result, the purpose is to improve the effect of preventing the occurrence of the white mist described above.

[0009]

In order to achieve the above object, in the invention according to claim 1, a first communication hole forming an inlet tank, a second communication hole forming an outlet tank, and these first communication holes are provided. And a plate (100) having a substantially U-shaped recess communicating with the second communication hole and forming a bonded body by forming a pair, and connecting the plurality of bonded bodies to the first communication hole. And by stacking the second communication holes so that they communicate with each other, an inlet tank is provided at the first communication holes, and an outlet tank is provided at the second communication holes.
And a laminated heat exchanger in which a plurality of tubes are formed by a plurality of the recesses, the plates (100)
The air communication holes (108, 109, 1) for communicating air.
13 to 116) are formed so as to penetrate therethrough, and the air communication holes (108, 109, 113 to 1) of the plates (100) are formed.
16) around the periphery of the substantially flat edge portions (102a, 102a, 102).
b, 111a, 112a, 102c, 101a) are formed, and the joined body is formed by the edge portions (102a, 102b, 111a, 112a,
102c, 101a) and the other plate (100)
The edges (102a, 102b, 111a, 112) of
a, 102c, 101a) are formed so as to face each other.

According to a second aspect of the present invention, in the laminated heat exchanger according to the first aspect, the joined body has edges (102a, 102b, 1b) of the one plate (100).
11a, 112a, 102c, 101a) and the edges (102a, 102b, 11) of the other plate (100).
1a, 112a, 102c, 101a) are formed in contact with each other.

According to a third aspect of the present invention, in the laminated heat exchanger according to the first or second aspect, the air communication holes (113, 114) of the plate (100) include the tube (101). It is characterized in that it is formed in a portion (111, 112) which is out of the refrigerant passage of (1).

According to a fourth aspect of the present invention, in the laminated heat exchanger according to the first or second aspect, the air communication holes (108, 109, 115, 116) are the same as those of the plate (100). It is characterized in that it is formed in the refrigerant passage of the tube (101).

The fact that the edge portion in the invention according to claim 1 is substantially flat means that the edge portion is formed with a projection-like piece protruding from the surface of the edge portion (the surface of the plate). That is not done. Further, the reference numerals in the parentheses of the above-mentioned means indicate the correspondence with the concrete means of the embodiments described later.

[0014]

According to the invention described in claims 1 to 4, when a plurality of bonded plates are stacked, a plurality of first communication holes of each plate are stacked in an inlet tank. When the refrigerant flows in, the refrigerant is distributed into a plurality of substantially U-shaped tubes composed of a plurality of recesses, and then the second communication holes are stacked in a plurality of outlet tanks. Gather.

Here, the above-mentioned joined body is formed such that the edge portions formed on each plate face each other,
Moreover, since this edge portion is substantially flat, an air communication hole formed inside this edge portion is in a state in which, for example, a protruding piece is not fitted. Therefore, the passage area of the air communication hole can be increased as compared with the case where the above-mentioned protruding piece is fitted in the air communication hole, and the heat exchange efficiency between the air bodies between the bonded bodies is improved, As a result, it is possible to improve the effect of preventing the occurrence of the white mist described above.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a refrigerant evaporator of an automobile air conditioner will be described with reference to FIGS. First, the refrigeration cycle and ventilation system of this embodiment will be described with reference to FIG.

As shown in FIG. 1, the refrigeration cycle 1 includes a compressor 2 that sucks, compresses, and discharges a refrigerant, a condenser 3 that condenses a high-pressure refrigerant from the compressor 2, and a gas-liquid from the condenser 3. Two
A liquid receiver 4 that discharges only the liquid refrigerant of the layer refrigerant, and an expansion valve (pressure reducing means) 5 that decompresses and expands the refrigerant from the liquid receiver 4.
And an evaporator 6 for evaporating the refrigerant from the expansion valve 5.

The compressor 2 is connected to an automobile engine 9 via a magnet clutch 7 and a belt 8. When the magnet clutch 7 is energized and turned on, the rotational power of the automobile engine 9 is transferred to the compressor 2. Transmitted. The evaporator 6 is arranged in an air conditioning duct 10 (air passage) that communicates with the vehicle interior. On the air upstream side of the air conditioning duct 10, there are formed an inside air suction port 11 for sucking air inside the vehicle and an outside air suction port 12 for sucking outside air. These suction ports 11 and 12 are the inside air / outside air switching means 1
3 selectively opens and closes. Further, on the downstream side, there is provided an air blowing unit 14 that sucks the inside air or the outside air and blows the inside air into the passenger compartment.

A heating means 15 for heating the air is provided in the air conditioning duct 10 on the air downstream side of the evaporator 6, and the air is directed toward the vehicle window glass at the downstream end of the air conditioning duct 10. A defroster outlet 16 for blowing out, a face outlet 17 for blowing air toward the upper half of the passenger in the passenger compartment, and a foot outlet 18 for blowing air toward the feet of the passenger in the passenger compartment are formed. These outlets are selectively opened and closed by the outlet switching means 19.

When the magnet clutch 7 is turned on and the compressor 2 is driven, the evaporator 6 dehumidifies and cools the air from the blowing means 14, and the cold air is temperature-controlled by the air mix door (temperature adjusting means) 20. After that, the outlet 1
It is blown into the vehicle compartment from any of 6 to 18. Next, a specific structure of the evaporator 6 will be described with reference to FIGS.
In FIG. 2, the plate 100 of the evaporator 6 is
In order to make the structure of (3) easy to understand, the portion protruding toward the front side of the paper is hatched even if it is not a cut surface.

In FIG. 2, the plate 100 is made of a double-sided clad material having a plate thickness of 0.5 to 0.6 (mm). Specifically, the core material is made of A3003 material or the like, and the clad skin material is made of A4104 material, which is press-formed from a plate material having a clad rate on one side of 10 to 15%.
A U-shaped passage forming recess 101 is formed in the plate 100 by press molding. Since this passage forming recess 101 is U-shaped, a partition rib 102 is formed in the center thereof. In addition, a plurality of ribs 103 that float above the plane of the drawing in the drawing are bulged in the passage forming recess 101.

The U-shaped hollow portion 10 for forming a passage is formed.
A first tank forming dent 104 and a second tank forming dent 105 having a deeper depth than the dent 101 are formed at both ends of 1. A first communication hole 106 having a substantially elliptical shape is formed through the bottom of the first tank forming recess 104. A second communication hole 107 having a substantially elliptical shape is formed so as to penetrate the bottom of the second tank forming recess 105. In addition, in the peripheral portion of the second communication hole 107,
A flange portion (not shown), which plays a role of positioning when a plurality of joined bodies formed by joining the plates 100 to each other are stacked, is formed so as to project to the inner side of the drawing.

A partition rib 1 extending vertically in the figure
On the No. 02, elliptical ribs 102a and 102b having a substantially elliptical shape are formed at some places (two places in this embodiment). These elliptical ribs 102a and 102b
Is the same as the height of the outer peripheral rib 110 and the partition rib 102 formed on the edge of the passage forming recess 101, and the insides of the elliptical ribs 102a and 102b are recesses. Further, air communication holes 108 and 109 having a substantially elliptical shape are formed at the bottoms of these recesses so as to penetrate therethrough.

Plate 1 press-formed as described above
00, the outer peripheral rib 110 and the partition rib 10
2. Since the elliptical ribs 102a, 102b, and the rib 103 are all flat and have the same height, the outer peripheral rib 110, Partition rib 102,
The elliptical ribs 102a, 102b and the rib 103 are in contact with each other.

Then, as shown in FIGS. 3 and 4, the joints are connected to the communicating holes 106 and 107, 107 and 10 of the joints.
6, 108 and 108, and 109 and 109 are stacked in a plurality of layers such that they overlap each other. Between each of the plurality of bonded bodies, a corrugated corrugated fin 123 for increasing a contact area with air and promoting a heat radiation effect is formed.
Is provided. Further, side plates 131 and 132 are provided at both ends in the stacking direction of the evaporator 6 formed by stacking a plurality of bonded bodies.

An inlet pipe 121 communicating with the first communicating hole 106 is connected to the joined body at one end (left side in FIGS. 3 and 4) of the evaporator 6 in the stacking direction. An outlet pipe 122 communicating with the second communication hole 107 is connected to the joined body at the other end of the evaporator 6 in the stacking direction (on the right side in FIGS. 3 and 4). Then, these are integrally formed by brazing in a furnace.

In the evaporator 6 thus laminated, the first communication hole 106 of each joined body and the first tank forming recess 104 are in communication with each other, whereby a substantially cylindrical tank extending in the longitudinal direction. Is formed. Further, in the evaporator 6, the second communication hole 107 of each joined body and the second tank forming recess 105 communicate with each other, thereby forming a substantially cylindrical tank extending in the longitudinal direction. Further, since the passage forming hollow portion 101 forms a refrigerant passage that connects the tanks to each other, a tube is formed by this.

In the evaporator 6 formed by stacking a plurality of the joined bodies, the first communicating hole 106 is closed at the joint surface between the two joined bodies 401 and 402 located substantially at the center in the stacking direction. Since it is in the open state, the first tank A formed on the inlet pipe 121 side with respect to this joint surface.
The refrigerant that has flowed into the outlet pipe 12 is higher than the joint surface.
Without flowing into the fourth tank D formed on the second side,
It flows into the second tank B through the U-shaped passage forming recess 101.

As described above, the refrigerant from the inlet pipe 121 flows into the first tank A, as shown by the arrow F in FIG. 4, and then from the first tank A, the passage forming recesses 10 are formed.
The first tank A constitutes an inlet tank, and the second tank B constitutes an outlet tank, since they are distributed in 1 (tube) and collected in the second tank B. Further, the refrigerant collected in the second tank B flows into the third tank C, and then is distributed from the third tank C to the passage forming recesses 101 (tubes) and collects in the fourth tank D. , The third tank C constitutes an inlet tank, and the fourth tank D constitutes an outlet tank.

Further, the air communication holes 108 and 109 of the laminated evaporator 6 are in a state of communicating with each other in the left-right direction of FIGS. 3 and 4, whereby an air communication passage extending in the longitudinal direction is formed. ing. Next, the operation of the above configuration will be described. First, in the ventilation system, the inside air or the outside air selected by the inside / outside air switching unit 13 is sucked into the air conditioning duct 10 by the blowing unit 14, and the sucked air is pressure-fed toward the evaporator 6. Then, this air passes through the evaporator 6, is then temperature-controlled by the air mix door 20, and is then blown into the vehicle compartment from any of the air outlets 16 to 18.

At this time, the refrigeration cycle 1 is activated,
The gas-liquid two-layer refrigerant flows into the first tank A from the inlet pipe 121 and is distributed to the passage forming recesses 101. Then, the refrigerant distributed to each passage forming recess 101 flows in a U-shape through the recess 101 while absorbing heat from the air in the air conditioning duct 10, and collects in the second tank B.

The refrigerant in the second tank B is the third tank C.
And is distributed to each passage forming recess 101. Then, the refrigerant distributed to each passage forming recess 101 flows in a U-shape through the recess 101 while absorbing heat from the air in the air conditioning duct 10 and collects in the fourth tank D. Then, it flows out of the outlet pipe 122 and the compressor 2
Inhaled.

By the way, in the evaporator 6 having the above-described structure, depending on the conditions of the refrigeration cycle 1, the refrigerant distribution from the first tank A to the passage forming recesses 101 and the passage formation from the third tank C to each passage are formed. The distribution of the refrigerant in the depressions 101 may not be uniform. For example, the state of the refrigerant distribution from the third tank C to the passage forming recesses 101 may vary as shown by the length of arrow Q in FIG.

FIG. 5 is a schematic view of the evaporator 6 of this embodiment as seen from the direction of arrow W in FIG. In addition, in FIG.
Although the state of the refrigerant distribution from the tank A to the passage forming recesses 101 is not shown, it is assumed here that this distribution is also non-uniform. In addition, in FIG. 5, the blowout temperature of the air passing through each stage is shown when the region from the tank side of the refrigerant evaporator 6 to the lower part is divided into the upper stage, the interruption, and the lower stage in approximately three equal parts.

Therefore, in this embodiment, by forming the air communication holes 108 and 109 in each plate 100, the evaporator 6 formed by stacking a plurality of bonded bodies of the plate 100 is laminated.
In, the air communication holes 108 and 109 form an air communication passage extending in the longitudinal direction. Therefore, as described above, the recesses 101 for forming the passages are formed.
The amount of refrigerant distributed to the refrigerant is uneven, and as a result, even if a temperature difference occurs in the air flowing through the refrigerant evaporator 6 between the joint bodies,
Since the air flowing between the bonded bodies can exchange heat with each other through the air communication passage, the difference in the distribution of the blowout temperature of the air after passing through the refrigerant evaporator 6 becomes small as shown in FIG.

FIG. 6 shows a diagram corresponding to FIG. 5 in the case of the conventional example in which the structure of the plate 100 is as shown in FIG. As can be seen by comparing FIG. 6 and FIG. 5, the air communication holes 108 and 109 are formed in the plate 100 in the present embodiment in which the plate 100 is formed with the air communication holes 108 and 109. It is possible to reduce the variation in the temperature of the air blown from the evaporator 6 as compared with the conventional example in which the evaporator 6 is not provided.

Further, in this embodiment, as described above, when the flat elliptical ribs 102a and 102b are formed around the air communication holes 108 and 109 of each plate 100 and the plates 100 are faced to each other and joined together. These elliptical ribs 102a and 102a, and 102b and 1
02b are in contact with each other. Therefore, in the joined body of the plates 100, the protrusions, for example, are not fitted in the air communication holes.

Therefore, in this embodiment, the above-mentioned actual fairness 6-39 is used.
Since the passage areas of the air communication holes 108 and 109 after the plates 100 are joined can be increased as compared with the invention described in Japanese Patent No. 248, in which the protrusions are fitted into the air communication holes. As described above, it is possible to increase the heat exchange efficiency between the respective plates 100, and it is possible to improve the effect of preventing variations in the temperature of air blown from the evaporator 6. (Other Embodiment) In the embodiment shown in FIG.
By making a part of the bottom side (lower side in FIG. 7) of the slanting shape slanted, the refrigerant is allowed to smoothly flow along the slanted ribs 110a and 110b. By forming the oblique ribs 110a and 110b, portions 111 and 112 that are out of the refrigerant passage are formed on the bottom side of the plate 100.

Then, in this embodiment, the oblique rib 1 is formed.
Ribs 111a and 112a having substantially the same height as the oblique ribs 110a and 110b are formed from 10a and 110b toward the portions 111 and 112, and the insides of the elliptical ribs 111a and 112a are recessed. In addition, the air communication hole 11 is provided at the bottom of these recesses.
It is formed so as to penetrate through 3, 114.

Further, in this embodiment, the outer peripheral rib 11
0, partition ribs 102, diagonal ribs 110a, 110
b, the ribs 111a and 112a are formed in a flat shape.
As described above, also in this embodiment, the planar ribs 111 are provided around the air communication holes 113 and 114 of each plate 100.
a, 112a are formed, and these ribs 111a and
Since a and 112a and 112a are brought into contact with each other, in this joined body, for example, the above-mentioned projecting piece is not fitted into the air communication holes 113 and 114, and the above-mentioned embodiment is performed. Evaporator 6 as in the example
It is possible to improve the effect of preventing variations in the blown air temperature.

Further, in the embodiment shown in FIG. 8, the partition rib 1
Oval rib 102c that has the same height as 02 and is planar
Is formed over almost the entire length of the partition rib 102, and recesses are formed inside the elliptical rib 102. Further, the air communication hole 115 having a substantially elliptical shape is formed at the bottom of these recesses. ing. Also in this embodiment, a flat rib 102c is formed around the air communication hole 115 of each plate 100, and the ribs 102c and 102c are in contact with each other when the plates 100 are faced and joined to each other. Therefore, in this joined body, for example, such a protruding piece as described above is not fitted in the air communication hole 115, and as in the above embodiment, the variation in the temperature of the air blown out from the evaporator 6 is prevented. The effect can be improved.

Further, in the embodiment shown in FIG. 9, in addition to the embodiment shown in FIG. 7, an outer peripheral rib 110 and a partition rib 102 are further added.
A predetermined number of flat elliptical ribs 101a having the same height as that in the passage forming recessed portion 101 (4 in this embodiment) are formed.
Then, a hollow portion is formed inside each of the elliptical ribs 101a, and an air communication hole 116 having a substantially elliptical shape is formed through the bottom portion of each hollow portion.

Also in this embodiment, each plate 100
Since a flat rib 101a is formed around the air communication hole 116, and the ribs 101a and 101a are in contact with each other when the plates 100 are faced to each other and joined together, In the joined body, the air communicating hole 116 is in a state in which, for example, the above-mentioned projecting piece is not fitted, and the evaporator 6 is the same as in the above embodiment.
It is possible to improve the effect of preventing variations in the blown air temperature. (Modification) In the embodiment of FIG. 9 described above, the passage forming recess 1 is formed.
The air communication hole 116 is formed at 01, and the air communication holes 113 and 114 are formed at the portions 111 and 112 separated from the refrigerant passage, but the air communication holes are not provided at the portions 111 and 112 separated from the refrigerant passage, The air communication hole may be provided only in the passage forming recess 101.

Further, in each of the above embodiments, the ribs 102a, 1a
Although 02b, 111a, 112a, 102c, and 101a have been described as planar shapes, they may have rounded shapes. The point is that each rib does not have to be formed with a protruding piece protruding from the surface of the rib (the surface horizontal to the paper surface of FIGS. 2 and 7 to 9). In addition, the air passage holes 113 and 114 in FIGS.
The ribs 111a and 111a and the ribs 112a and 112a may not be in contact with each other in the joined body in which the plates 100 are joined. Because, even if they are not in contact with each other, the refrigerant flowing through the passage-forming recessed portion 101 is not connected to the air communication hole 11
This is because there is no fear of leaking from 3,114.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a refrigeration cycle and a ventilation system according to an embodiment of the present invention.

FIG. 2 is a front view showing the plate 100 of the embodiment.

FIG. 3 is a front view showing the entire refrigerant evaporator 6 of the above embodiment.

FIG. 4 is a top view of the refrigerant evaporator 6 of FIG.

FIG. 5 is a diagram schematically showing the distribution of refrigerant and the temperature of blown air in the refrigerant evaporator 6 of the above embodiment.

FIG. 6 is a diagram schematically showing a refrigerant distribution and a blown air temperature in a conventional refrigerant evaporator.

FIG. 7 is a front view of a plate 100 according to another embodiment of the present invention.

FIG. 8 is a front view of a plate 100 according to another embodiment of the present invention.

FIG. 9 is a front view of a plate 100 according to another embodiment of the present invention.

FIG. 10 is a front view of a conventional plate 100.

[Explanation of symbols]

6 ... Refrigerant evaporator (laminated heat exchanger), 100 ... Plate, 101 ... Passage forming recess (tube), 10
8, 109, 113 to 116 ... Air communication holes, 102a,
102b, 111a, 112a, 102c, 101a ...
Elliptical rib (edge)

Claims (4)

[Claims] 1. A first communication hole that forms an inlet tank, a second communication hole that forms an outlet tank, and a substantially U-shaped recess that communicates with the first communication hole and the second communication hole. The plates are joined in pairs to form a joined body, and a plurality of the joined bodies are stacked by making the first communicating hole and the second communicating hole communicatively communicate with each other. In a laminated heat exchanger in which an inlet tank is formed by one communication hole, an outlet tank is formed by the second communication hole that is stacked, and a plurality of tubes are formed by a plurality of the recesses, air is supplied to each plate. An air communication hole that communicates is formed so as to penetrate therethrough, a substantially planar edge portion is formed around the air communication hole of each plate, and the joined body is the edge portion of one of the plates and the other of the plates. The edges of the plate face each other A laminated heat exchanger characterized by being formed in a closed state. 2. The laminated heat according to claim 1, wherein the joined body is formed in a state where an edge portion of the one plate and an edge portion of the other plate are in contact with each other. Exchanger. 3. The laminated heat exchanger according to claim 1, wherein the air communication hole is formed in a portion of the plate that is out of the refrigerant passage of the tube. 4. The laminated heat exchanger according to claim 1, wherein the air communication hole is formed in the plate in the middle of the refrigerant passage of the tube.