JPH11108583A - Evaporator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of tanks 21a and 21b, and also, prevent the splash of water. SOLUTION: Both tanks 21a and 21b are coupled in a body through a coupling 22. A drain port 24 for discharging down the condensed water having flowed down the core is provided at one part of the coupling 22. By this constitution, the number of parts of both tanks 21a and 21b is reduced, and the cost is reduced. Furthermore, the occurrence of splash of water is prevented by discharging the condensed water from each drain port 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an evaporator incorporated in, for example, an air conditioner for a vehicle and used for cooling air in a passenger compartment.

[0002]

2. Description of the Related Art For example, an air conditioner for a vehicle incorporates an evaporator for evaporating a refrigerant inside and cooling air flowing outside. As an evaporator used by being incorporated in such an air conditioner, for example, Japanese Patent Application Laid-Open No. 61-49995 describes a structure as shown in FIGS.

[0003] This evaporator 1 is formed by combining members made of an aluminum alloy, and has a core portion 2. The core portion 2 includes a plurality of heat transfer tube elements 3 and 3 arranged in parallel in a lateral direction (left and right directions in FIG. 9) at appropriate intervals, and a space between adjacent heat transfer tube elements 3 and 3. And a plurality of corrugated fins 4, 4 sandwiched therebetween. Side plates 5 and 5 are provided on both lateral sides of the core 2. The fins 4, 4 are also sandwiched between the inner surfaces of the side plates 5, 5 and the outer surfaces of the heat transfer tube elements 3, 3 located at both ends. A pair of tanks 6a and 6b arranged in parallel with each other are provided below the core portion 2. The inside of each of the tanks 6a and 6b communicates with the inside of each of the heat transfer tube elements 3 and 3.

As shown in FIG. 10, each of the heat transfer tube elements 3, 3 is formed by laminating a pair of plate members 7, 7. As shown in FIG. Each of these plate members 7 is a so-called double-sided clad material in which a clad layer of a brazing material made of an aluminum alloy containing a large amount of Si is provided on both surfaces of an aluminum alloy plate. Each of the plate members 7, 7 is
One end in the longitudinal direction (vertical direction in FIG. 10) (lower end in FIG. 10)
A pair of protrusions 8a and 8b are formed at an interval from each other. Also, an inverted U-shaped recess 9 is formed on one side of each of the plate members 7,
It is formed in a state where it is continued to one end edge (the lower end edge in FIG. 10) of a and 8b. Further, a large number of projections 10 and 10 are formed at substantially uniform intervals over the entire surface of the recess 9 inside the recess 9. Each of these projections 10,
The return channel 1 described below, which is constituted by the recess 9.
1 to improve the heat exchange efficiency between the refrigerant and each of the plate members 7. At the same time, each of the projections 10, 10 also has a role of improving the pressure resistance of each of the heat transfer tube elements 3, 3 by brazing the respective tips to each other.

[0005] Each of the plate members 7, 7 is a set of two sheets, and is superposed in the middle while the concave portions 9 are opposed to each other.
The heat transfer tube elements 3 and 3 are configured by joining the outer peripheral edges existing around the recess 9 of the plate members 7 and 7 to each other in a gas-tight and liquid-tight manner. Each of the heat transfer tube elements 3 and 3 configured as described above has an inverted U-shaped (returned by 180 degrees at an intermediate portion) return flow path 1 formed by the recess 9.
1 and a pair of joints 12a and 12b located at both ends of the folded flow path 11 and protruding from one edge in the longitudinal direction.

On the other hand, each of the tanks 6a and 6b is formed by superposing a seat plate 13a and 13b and a tank body 14a and 14b in the middle. That is, each of these seat plates 13
The tank bodies 14a and 13b and the tank bodies 14a and 14b are also formed in a substantially ship shape by press-forming a plate material in which a brazing material is clad on both surfaces. The size of the opening of each seat plate 13a, 13b is slightly larger than the size of the opening of each tank body 14a, 14b. Each of these seat plates 13a, 13b and the tank body 14
a, 14b and the above-mentioned tanks 6a, 6b
In this case, the openings of the tank bodies 14a and 14b are fitted into the openings of the seat plates 13a and 13b.

A plurality of slit-shaped connection holes 15 are formed in each of the seat plates 13a and 13b. Each of the connection holes 15 has a shape and a size that allow the joining portions 12a and 12b of the heat transfer tube elements 3 and 3 to be inserted without a large gap. The above 1
A feed port 19 and a take-out port 20 are provided on the side surface of one of the pair of tanks 6a and 6b. A partition 16 is provided inside the intermediate portion of the tank 6a.
It is provided so as to be sandwiched between the seat plate 13a and the tank body 14a. When the evaporator 1 is completed,
6 divides the inside of the tank 6a into two parts while maintaining airtightness and liquid tightness.

Each of the heat transfer tube elements 3, 3 and a pair of tanks 6
In order to connect the heat transfer tube elements a and 6b, as shown in FIG. 12, the joints 12a and 12b of the heat transfer tube elements 3 and 3 are inserted into the connection holes 15 and 15 of the tanks 6a and 6b. Then, in the state of being inserted in such a manner, each of the joining portions 12a, 1
2b and the inner peripheral edge of each of the connection holes 15
Braze each other air-tight and liquid-tight. The brazing material for brazing is made on both sides of each of the plate members 7, 7 and each of the seat plates 13.
A brazing material laminated (cladded) on both sides of the plate material constituting a and 13b is used.

The aluminum alloy evaporator 1 constructed as described above is integrally connected to each other by brazing the contacting parts of the constituent members. Such brazing of the constituent members is performed as follows. First, each of the above components, that is, the heat transfer tube elements 3, 3, the fins 4, 4, the side plates 5, 5, and the tanks 6a, 6b each formed by stacking a pair of plate members 7, 7 are shown in FIG. And placed in a heating furnace while being held down by a jig (not shown). At this time, the tanks 6a and 6b are set downward. The reason for lowering the tanks 6a and 6b in this manner is that
A sufficient amount of molten brazing material is supplied between the outer peripheral surfaces of the connection holes 15 and 15 and the inner peripheral edges of the connection holes 15 and 15, and brazing is reliably performed between the outer peripheral surfaces and the inner peripheral edges (airtightness). And liquid-tight closing).

In the heating furnace, the constituent members are heated at a liquidus temperature higher than the liquidus temperature of the brazing material, but with a base material (aluminum alloy serving as a core material of the constituent members and maintaining strength). Heat to about 600 ° C., which is lower than the linear temperature. By this heating, the members (side plates 5, 5, plate 7,
7, seat plates 13a, 13b, tank bodies 14a, 14b)
The brazing material existing on the surface is melted, and the above-mentioned constituent members are joined together by brazing.

During the brazing, the inside of the tank 6a is divided by the partition 16 into an inlet chamber 17 and an outlet chamber 18 while maintaining airtightness and liquid tightness. The inlet 19 is provided at a portion corresponding to the inlet chamber 17, and the outlet 20 is provided at a portion corresponding to the outlet chamber 18.

When the evaporator 1 manufactured by brazing as described above is incorporated into an air conditioner for a vehicle, the evaporator 1 is installed in a duct with the tanks 6a and 6b being lowered. When cooling the air flowing through the duct, the inlet 19 is inserted into the inlet chamber 17 through the inlet 19.
A refrigerant in a liquid state or a gas-liquid mixed state is fed. This refrigerant flows through the return flow passage 11 in each of the heat transfer tube elements 3, 3, reaches the outlet chamber 18, and is taken out from the outlet 20. While flowing through the return channel 11, the refrigerant evaporates by removing surrounding heat. As a result, the temperature of the core portion 2 decreases, so that the air in the duct flowing between the fins 4 constituting the core portion 2 can be cooled and dehumidified.

Conventionally, generally, JIS 3003 material (0.6% by weight or less) has been
Si, 0.7% by weight or less of Fe, 0.05 to 0.20% by weight of Cu, 1.0 to 1.5% by weight of Mn, 0.10%
The following Zn and the individual are 0.05% by weight or less and the total is 0.1%.
An aluminum alloy containing 5% by weight or less of inevitable impurities and the balance being Al) was used as the brazing material according to JIS 43
43 materials (6.8-8.2 wt% Si, 0.8 wt% or less Fe, 0.25 wt% or less Cu, 0.10 wt%
Aluminum alloy containing the following Mn, Zn of 0.20% or less, and inevitable impurities of 0.05% by weight or less individually and 0.15% by weight or less in total, with the balance being Al. Was.

[0014]

The tanks 6a and 6b provided below the conventional evaporator 1 constructed as described above.
Are the seat plates 13a and 13b and the tank body 14a, respectively.
14b, and is composed of a total of four parts. As described above, since the number of components of both tanks 6a and 6b is large, each of the seat plates 13a and 6b is not assembled until these tanks 6a and 6b are assembled to the lower end of the core portion 2.
13b and the tank bodies 14a and 14b are reliably overlapped with each other, and a state in which the alignment between the two tanks 6a and 6b is ensured (the parallelism and the like between the two tanks 6a and 6b are ensured. , 6b are not irregularly arranged) and the work of assembling the lower end of the core portion 2 is required. These operations are troublesome and hinder the reduction of the manufacturing cost of the evaporator 1.

Each of the seat plates 13a, 13b and the tank bodies 14a, 14b is made of a double-sided clad material. The price of the double-sided clad material is considerably higher than that of a bare material (a material consisting only of a base material of an aluminum alloy) in which the brazing material is not laminated on its surface. For this reason, the cost of the evaporator 1 is increased.

When the components of the evaporator 1 (the seats 13a, 13b, etc.) are heated and brazed, the molten brazing material is removed from the connection holes 1 by capillary action.
It gathers in a minute gap existing between the inner peripheral edge of 5, 15 and the outer peripheral surface of each of the plate members 7, 7 to form a fillet.
This fillet is a joint 1 of the heat transfer tube elements 3 and 3.
2a, 12b and each of the connection holes 15, 15 are air-tightly and liquid-tightly brazed. In this case, if the fillet is formed by the molten brazing material solidifying in the minute gap, no particular problem occurs. However, as described above, the seat plates 13a and 13b and the tank bodies 14a and 14b
Is made of the double-sided clad material, the plate members 7, 7
The molten brazing material is drawn from the respective seat plates 13a, 13b by the molten brazing material, and the above-mentioned tank bodies 14a,
Flow down to 14b. For this reason, the molten brazing material collected in the minute gap may flow away from the minute gap. In this case, the molten brazing filler metal present in the minute gap tends to be insufficient, causing poor brazing of the minute gap, lowering the yield of the evaporator 1,
It causes cost increase. The evaporator of the present invention has been invented to solve the above-mentioned disadvantages.

[0017]

The evaporator according to the present invention is, like the above-described conventionally-known evaporator, a hollow cylindrical member which is disposed almost in parallel with each other and has both axial ends closed. It comprises a pair of metal tanks, a plurality of slit-like connection holes formed on the upper surface of each of these tanks, and a plurality of heat transfer tube elements. Then, a pair of return channels provided inside each of the heat transfer tube elements and turned back at 180 degrees at the intermediate portion, and one pair at one end edge of each of the heat transfer tube elements are provided at an interval from each other. The heat exchanger includes a joint portion that can be inserted into a connection hole of each of the tanks, and a plurality of fins sandwiched between outer surfaces of the adjacent heat transfer tube elements. In particular, in the evaporator according to the first aspect, the two tanks are integrally connected via a connecting portion, and condensed water flowing down from each of the heat transfer tube elements and the fins is partially connected to the connecting portion. A drain hole is provided for discharging downward.

Further, in the evaporator according to the present invention, a side plate is attached to both side surfaces of the core portion composed of the plurality of heat transfer tube elements and the fins so as to sandwich the core portion. Portions of the plate that are located on both tank sides extend below the lower end of the core to form extensions. Then, a part of the extension part, a sealing part for closing both axial ends of the two tanks, and a part of the two tanks are engaged with each other, and these two tanks move in a direction away from the core part. And an engaging portion for preventing the movement of the vehicle.

[0019]

As described above, in the evaporator of the present invention, the two tanks are integrally connected via the connecting portion, so that the number of parts constituting these two tanks can be reduced. Therefore, the cost of both tanks can be reduced, and the number of assembling steps of an evaporator incorporating both tanks can be reduced.

Further, by integrally forming the two tanks, it is possible to eliminate the need for brazing when forming each tank. In this case, both tanks can be made of inexpensive bare material, and the cost of both tanks can be reduced. If the two tanks are made of bare material on which no brazing material is laminated, molten brazing material gathered in minute gaps at the junction between each tank and the heat transfer tube element will be present in each tank portion. It will not be pulled by the material. For this reason, the brazing material does not flow out from the minute gaps, and the occurrence of brazing defects in the minute gaps can be reduced.

Further, as in the second aspect of the present invention, if a sealing portion for closing both axial ends of the two tanks is provided in a part of the extending portion provided on the side plate, the both tanks can be provided. Since both ends in the axial direction are closed, there is no need to provide independent members. Therefore, the number of parts of the evaporator can be reduced. Further, by providing an engaging portion that engages with a part of the two tanks on a part of the extending portion provided on the side plate, after the evaporator is temporarily assembled, and until the heating brazing is performed, Both tanks can be prevented from moving away from the core. Then, the assembling accuracy of the evaporator can be improved, and the yield of the evaporator can be improved.

During the operation of the evaporator, the air flowing through the core is cooled, and the water contained in the air is condensed to form water droplets. The water droplets adhere to the outer surface of each of the heat transfer tube elements constituting the core and the surface of each of the fins. In this way, the water droplets adhering to the heat transfer tube elements and the fins flow down below the core portion and reach the upper surface of the connecting portion connecting the pair of tanks. The condensed water that has reached the upper surface of the connecting portion is discharged downward through the drain hole. Therefore, it is possible to prevent a large amount of condensed water from staying on the connection portion and the upper surface of each tank, and to prevent so-called flying water in which the condensed water is scattered to the leeward side.

[0023]

FIG. 1 shows a first embodiment of the present invention corresponding to claim 1. The basic structure of the evaporator of the present invention is the same as the conventional structure shown in FIG. In particular, the evaporator of the present invention connects the pair of tanks 21a and 21b integrally via the connecting portion 22, and also condenses the condensed water flowing down from the core portion 2 (FIG. 9) to a part of the connecting portion 22 downward. This is different from the conventional structure in that drain holes 24, 24 are provided for discharging water. Therefore, for the structure and operation of the other parts, overlapping illustration and description will be omitted or simplified, and the following description will focus on the characteristic parts of the present invention and the parts different from the conventional structure shown in FIGS. Focus on the center.

In the case of this embodiment, the tanks 21a and 21b and the connecting portion 22 are integrally formed by extruding an aluminum alloy. Therefore, both tanks 2
1a, 21b and the connecting portion 22 are bare materials having no brazing material laminated on the surface. Both tanks 21a, 21b
Are arranged in parallel with each other, and these two tanks 21a, 2a
1b are integrally connected via a connecting portion 22. Drain holes 24, 24 for discharging condensed water flowing down from the core portion 2 downward are provided in a part of the connecting portion 22. Each of these drain holes 24, 24 is
After a, 21b and the connecting portion 22 are integrally extruded, the holes are punched. Each of the tanks 21a and 21b is formed in a hollow cylindrical shape, and has openings 23 and 23 at both ends in the axial direction. Each of these openings 23,
Numerals 23 are closed by air-tight and liquid-tight seals by lids (not shown) each having a brazing material laminated on the surface. Further, a plurality of slit-shaped connection holes 15 are provided on the upper surfaces of the tanks 21a and 21b, respectively. These connection holes 15 are also perforated after integral extrusion molding. In the case of this example, the thickness t ₂₂ of the respective tanks 21a of the connecting portion 22, 21b having a thickness of t _21a, is smaller than _{t 21b (t 22 <t 21a} , t 22 <t 21b ). This is because, by minimizing the thickness t ₂₂ of the connecting portion 22, with reduced and weight reduction of the material cost, is to facilitate the drilling of each drain hole 24, 24 .

The two tanks 21a constructed as described above,
In the case of the evaporator of the present invention incorporating 21b,
By reducing the number of parts constituting these two tanks 21a and 21b, the cost of these two tanks 21a and 21b is reduced, and the man-hour for assembling the evaporator incorporating these two tanks 21a and 21b is reduced, and the manufacturing cost of the evaporator is reduced. Can be reduced. The two tanks 21a,
A pair of lids that close the openings at both ends of 21b are configured to simultaneously close the openings 23, 23 of both tanks 21a, 21b, respectively.

Further, in the case of this embodiment, each of the tanks 21
The brazing when forming a and 21b is unnecessary except for brazing the lid. Therefore, each of the tanks 21
Since a and 21b can be made of an inexpensive bare material, the cost of each of the tanks 21a and 21b can be reduced. As a result, the cost of the evaporator of the present invention can be reduced.
Also, a connection hole 15 is formed in a part of the two tanks 21a and 21b.
Because there is no brazing material around 15
The inner peripheral edge of each of these connection holes 15, 15 and each of the heat transfer tube elements 3,
The molten brazing material gathered in the minute gap between the outer peripheral surfaces of the joints 12a and 12b (FIGS. 10 and 12) of the No. 3 does not flow out of the minute gap, and exists in the minute gap. There is no shortage of molten brazing material. As a result,
It is possible to reduce the occurrence of the brazing failure of the minute gap, and to improve the yield of the evaporator.

During operation of the evaporator, the core 2
The air flowing through (FIG. 9) is cooled, and the water contained in the air is condensed to form water droplets. The water droplets adhere to the outer peripheral surface of each of the heat transfer tube elements 3 and 3 and the surface of each of the fins 4 and 4 constituting the core 2 and then the core 2
, And reaches the upper surface of the connecting portion 22. As described above, the condensed water that has reached the upper surface of the connecting portion 22 is discharged to the drain hole 2.
It is discharged downward through 4, 24. Therefore, it is possible to prevent a large amount of condensed water from staying on the upper surface of the connection portion 22 and the tanks 21a and 21b, and to prevent so-called flying water in which the condensed water is scattered to the leeward side.

Next, FIG. 2 shows a second embodiment of the present invention corresponding to claim 1. In this case,
The pair of tanks 21c and 21d are integrally formed by roll-forming an aluminum alloy plate. In the case of this example, the aluminum alloy plate is a clad material. The reason for this is to braze and join the butted portions 32, 32 in order to make the tanks 21c, 21d air-tight and liquid-tight. However, the two tanks 21c, 2
When manufacturing 1d, one side (tank 21c, 21d
It is preferable to use a clad material in which a brazing material is laminated only on the inner peripheral surface side of the cladding material. The reason for this is that the molten brazing material existing in the minute gap between the inner peripheral edges of the connection holes 15 and the outer peripheral surfaces of the joints 12a and 12b (FIGS. 10 and 12) of the heat transfer tube elements 3 and 3. This is because the contact of the brazing material on the surface of the clad material with the brazing material is reduced, the brazing material in the gap is prevented from being drawn out, and the brazing material in the gap is not shorted.
In the case of this example, a connecting portion 22a is formed by a widthwise intermediate portion of the aluminum alloy plate forming both the tanks 21c and 21d, and a part of the connecting portion 22a is provided with the core portion 2 (FIG. 10). ) Are provided with drain holes 24a, 24a for discharging the condensed water flowing down from below.

The two tanks 21 formed as described above
Similarly to the case of the first example, c and 21d are formed in a hollow cylindrical shape, and have openings 23a and 23a at both ends in the axial direction. These openings 23a, 23a
Are closed by lids (not shown) in the same manner as in the first example described above. The two tanks 21c, 21d
The construction and operation are the same as in the case of the above-described first example, except that the material for producing the above is a plate made of the clad material.

Next, FIG. 3 shows a third embodiment of the present invention corresponding to claim 1. In the case of this example, the pair of tanks 21e and 21f are formed by superimposing a tank plate 26 and a tank body 26 each formed by pressing an aluminum alloy plate in the middle. These seat plates 25
And the tank main body 26 integrally connect the substantially ship-shaped portions provided in pairs, respectively, via connecting portions 22b, 22b, and at portions where the connecting portions 22b, 22b are aligned with each other, Drain holes 24b, 24b are provided for discharging condensed water flowing down from the core portion 2 (FIG. 10) downward. The seat plate 25 and the tank main body 26 are overlapped with each other so that the opening edges thereof abut each other, and the butted portions are brazed to each other in a gas-tight and liquid-tight manner. Except for having no lid and using a clad material for the tank body 26 (preferably using a bare material for the seat plate 25), the construction and operation are the same as in the case of the first example described above. It is.

Next, FIGS. 4 to 6 correspond to claim 2.
14 shows a fourth example of an embodiment of the present invention. The basic structure of the evaporator 1a of this example is the same as that of the conventional evaporator 1 shown in FIG. In particular, the evaporator 1a of the present example has a lower portion of the side plate 27 attached to both side surfaces of the core portion 2 and a portion located on both tanks 21a and 21b side lower than the lower end portion of the core portion 2 described above. Extended to
The extension 28 is provided. A part of the extension part 28 is a sealing part that seals both ends in the axial direction of the two tanks 21a and 21b, and at the same time, is engaged with a part of the two tanks 21a and 21b. , 21b are also provided as projections 29, 29 which are also engagement portions for preventing the core 21 from moving away from the core 2. The tanks 21a and 21b used in this embodiment are the same as those in the first embodiment shown in FIG.

Each of the convex portions 29, 29 is
Openings 2 formed at both axial ends of 1a, 21b
3 and 23, and closes the openings 23 and 23 in a gas-tight and liquid-tight manner, and at the same time, prevents the tanks 21a and 21b from moving away from the core 2.

When assembling the above-described evaporator 1a of the fourth example, first, as shown in FIG. 6, the core portion 2 composed of the heat transfer tube elements 3, 3 and the fins 4, 4, The tanks 21a and 21b are assembled. Thereafter, the side plates 27 are attached to both side surfaces of the core portion 2. At this time, the projections 29 are fitted in the openings 23 of the tanks 21a and 21b. As the aluminum alloy plate constituting the side plate 27, a material in which a brazing material is clad on the surface on the core portion 2 side is used.

The evaporator 1 of the present embodiment configured as described above
In a, since both ends in the axial direction of both tanks 21a and 21b are closed, it is not necessary to prepare an independent member such as a lid. Therefore, the number of parts of the evaporator 1a can be reduced. In addition, the two tanks 21a and 21b can be prevented from moving in the direction away from the core portion 2 from the temporary assembly of the evaporator 1a to the heating in the heating furnace and the brazing and fixing. Thus, in the case of the present example, each of the convex portions 29, 29 is
The displacement of the evaporator 1a in the direction away from the core portion 2 can be prevented, and the assembling accuracy of the evaporator 1a can be improved, and the yield of the evaporator 1a can be improved.

FIG. 7 shows a fifth embodiment of the present invention corresponding to claim 2. In the case of this example, a sealing portion that covers both ends in the axial direction of both tanks 21a and 21b is provided in a part of the extension portion 28,
A concave portion 30 is provided, which is also an engaging portion that prevents the first and second members 1a, 21b from moving away from the core portion 2.
The recesses 30 are externally fitted to both ends of the tanks 21a and 21b in the axial direction, and seal the openings 23 and 23 in a gas-tight and liquid-tight manner. The recess 30 has a pair of tanks 21a,
It is assumed that the end and the end of each of the tanks 21a and 21b can be independently and internally fitted. In the case of independent fitting, the continuous portion 22
The end of (FIG. 1) is cut off. Other configurations and operations are
This is the same as the case of the fourth example described above.

FIG. 8 shows a sixth embodiment of the present invention corresponding to claim 2. In this case,
A portion of the extension 28 provided at the lower end of the side plate 27 and located above each projection 29 includes an elastic deformation portion 31.
Is provided. The elastically deforming portion 31 is formed in an arc-shaped cross section, and has a function of absorbing a displacement between the main body portion of the side plate 27 and the extending portion 28. This shift is caused by lowering the temperature of the heated and brazed evaporator 1a to room temperature, thereby causing the core portion 2 and both tanks 21a, 21a
When each of the side plate 27 and the side plate 27 contracts, a difference occurs in the amount of contraction based on the difference in heat capacity. In the case of this example, this displacement is absorbed by the deformation of the elastic deformation portion 31 during brazing. Other configurations and operations are the same as those of the above-described fourth example. Note that the side plate 2 of the fifth example shown in FIG.
7, it is also possible to provide an elastic deformation portion 31 as in this example.

[0037]

Since the evaporator according to the present invention is constructed and operates as described above, the manufacturing cost can be reduced and the assemblability can be improved. As a result, it is possible to contribute to a reduction in the cost of the air conditioner incorporating the evaporator.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tank showing a first example of an embodiment of the present invention.

FIG. 2 is a perspective view of a tank showing the second example.

FIG. 3 is a perspective view of a tank showing the third example.

FIG. 4 is a perspective view of an evaporator showing the fourth example.

FIG. 5 is a schematic exploded perspective view showing a state before assembling an evaporator of a fourth example.

FIG. 6 is a schematic side view of the same.

FIG. 7 is a cross-sectional view of a main part of an evaporator, showing a fifth example of an embodiment of the present invention.

FIG. 8 is a view similar to FIG. 7, showing the sixth example.

FIG. 9 is a perspective view showing an example of an evaporator to which the present invention is applied.

FIG. 10 is a partially exploded perspective view showing a portion including one tank.

FIG. 11 is a partially exploded perspective view showing the other tank.

FIG. 12 is a cross-sectional view taken along the line AA of FIG. 8, showing a joint state between the tank and the heat transfer tube element.

DESCRIPTION OF SYMBOLS 1, 1a Evaporator 2 Core part 3, 3a Heat transfer tube element 4 Fin 5 Side plate 6a, 6b Tank 7 Plate material 8a, 8b Projection part 9 Concave part 10 Projection 11 Turnback channel 12a, 12b Joint part 13a, 13b Seat plates 14a, 14b Tank main body 15 Connection hole 16 Partition wall 17 Inlet chamber 18 Outlet chamber 19 Inlet 20 Outlet 21a, 21b, 21c, 21d, 21e, 21f Tank 22, 22a, 22b Connecting part 23, 23a Opening 24, 24a , 24b drain hole 25 seat plate 26 tank body 27 side plate 28 extension portion 29 convex portion 30 concave portion 31 elastic deformation portion 32 butting portion

Claims (2)

[Claims] 1. A pair of metal tanks arranged substantially parallel to each other and closed at both ends in the axial direction and made of metal, and a plurality of slits formed on the upper surface of each of these tanks. Connection holes, a plurality of heat transfer tube elements, provided on the inside of each of the heat transfer tube elements, a folded flow path that is folded back 180 degrees at the intermediate portion, and one pair at one end edge of each of the heat transfer tube elements, In an evaporator provided with a space between each other, each having a joint portion that can be inserted into a connection hole of each of the tanks, and a plurality of fins sandwiched between outer surfaces of the adjacent heat transfer tube elements. The two tanks are integrally connected via a connecting portion, and a part of the connecting portion includes:
An evaporator having a drain hole for discharging condensed water flowing down from each of the heat transfer tube elements and the fins downward. 2. A part of a side plate attached to both side surfaces of a core portion composed of a plurality of heat transfer tube elements and fins in a state where the core portion is sandwiched, and a portion located on both tank sides is provided.
Along with extending below the lower end of the core portion to form an extended portion, a part of the extended portion includes a sealing portion that covers both axial ends of the two tanks, and a part of the two tanks. The evaporator according to claim 1, further comprising an engaging portion that engages and prevents the two tanks from moving away from the core portion.