JPH11281265A - Laminate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a uniformization of heat exchange efficiency (temperature distribution) over the entire area of a laminate type heat exchanger. SOLUTION: In this heat exchanger, two each of press plates 8 and 8 and 13A and 13B are joined together and flat tubes 2A and 2B forming passageways 7A and B of a heat exchange medium therebetween and a fin are laminated alternately. The heat exchange medium supplied from a supply pipe 34 is fluidized inside the flat tubes 2A and 2B and undergoes a heat exchange with air passing along the fin outside the flat tubes 2A and 2B. A plurality of the flat tubes 2A and 2B are divided into two groups on the upstream side and on the downstream side, the flat tubes 2A and 2B are laminated alternately making inlets of the flat tubes 2A communicate with each other of the group on the upstream side and outlets thereof are made to communicate with inlets of the fat tubes 2B of the group on the downstream side adjacent thereto. Moreover, the outlets of the flat tubes 2B of the group on the downstream side are made to communicate with each other.

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 more particularly, to a heat exchanger used as an evaporator in a refrigeration cycle of an air conditioner for an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, this type of laminated heat exchanger is shown in FIG.
As shown in FIG. 2, a flat tube 100 in which two press plates having the same shape are opposed to each other and joined to form two tank portions 102 having a substantially U-shaped heat exchange medium flow path 101 and an opening 103, and a corrugated tube. And fins 105 in the shape of a circle, and these are alternately stacked. The heat exchange medium supplied from the supply pipe flows in the flow path 101 of the flat tube 100 and evaporates during this time, thereby removing heat from the air outside the flat tube 100 and cooling the outside air. Like that.

In the above-mentioned laminated heat exchanger, a flat tube 1
When the flow rate of the heat exchange medium in the flow path 101 of 00 becomes slow, the heat exchange efficiency decreases. Therefore, as shown in FIG. 10, among the plurality of flat tubes 100 to be laminated, the tank portion 102 on the inlet side of the flat tube 100 a disposed at the center portion is not provided with the opening 103 but as the closing portion 104, The left and right sides of the entire flat tube 100 are divided into the upstream side A and the downstream side B.
The flat tube 1 into which the heat exchange medium flows at once
00 by reducing the cross-sectional area of the flat tube 1
The flow rate of the heat exchange medium in the flow path 101 is increased so that the heat exchange efficiency is improved.

[0004]

However, in the above-mentioned laminated heat exchanger, the heat exchange medium is vaporized in the downstream side B, and the state of the dryness and the like is changed by the vaporization of the heat exchange medium. A difference occurs in the heat exchange efficiency of the outside air between the side A and the downstream side B. That is, in the heat exchanger as a whole, since heat is unevenly distributed in two regions, in the case of an evaporator such as an air conditioner for a vehicle, the blowing temperature varies due to the outlet, and the temperature controllability deteriorates. There was a problem. This problem is prominent when the air conditioner is operated intermittently.

Therefore, an object of the present invention is to make the heat exchange efficiency (temperature distribution) uniform over the entire area of the stacked heat exchanger.

[0006]

In order to solve the above-mentioned problems, a laminated heat exchanger according to the present invention has a flat tube in which two press plates are joined to form a heat exchange medium flow path therebetween. And the fins are alternately stacked, and the heat exchange medium supplied from the supply pipe is caused to flow inside the flat tube, so that the heat exchange medium and air flowing along the fin outside the flat tube are heated. In the stacked heat exchanger to be exchanged, the plurality of flat tubes are connected to upstream and downstream tubes.
Divided into two groups, these flat tubes are alternately stacked, the inlets of the flat tubes in the upstream group are communicated with each other, and the outlets thereof are communicated with the inlets of the flat tubes in the adjacent downstream group, and further downstream. The outlets of the flat tubes of the side group communicate with each other.

[0007] According to the laminated heat exchanger, a plurality of flat tubes are divided into an upstream side and a downstream side, and these are alternately laminated. Even if the heat exchange efficiency of the air changes, these temperature differences are neutralized and discharged, so that the temperature distribution of the cooled air can be made uniform over the entire area.

In the laminated heat exchanger, the flat tube is provided with three tank portions for flowing the heat exchange medium, and the flow passages are formed by connecting the tank portions at both ends of the tank portions. The first flat tube, the second flat tube having the flow path formed by connecting the tank portion at one end and the tank portion at the center are formed, and one of them is set as the upstream side, and the other is set as the downstream side. The side is preferably.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an evaporator 1 for a vehicle air conditioner, which is a laminated heat exchanger of the present invention. The evaporator 1 generally includes a flat tube 2
, Corrugated fins 3 and connecting members 4A, 4B
And an end plate 5.

As shown in FIG. 3, the flat tube 2 includes a first flat tube 2A and a second flat tube 2B.
The first flat tubes 2A are defined as an upstream group through which the heat exchange medium flows, while the second flat tubes 2B are defined as a downstream group, and these flat tubes 2A and 2B are alternately arranged. To be laminated. FIG. 4 (A),
As shown in (B) and (C), three tank portions 6 are provided at the upper end.
a, 6b, and 6c are formed, and heat exchange medium channels 7A and 7B that are substantially U-shaped are formed.

More specifically, the first flat tube 2A is shown in FIG.
The first press plate 8 is formed by pressing a metal plate of aluminum or the like shown in FIGS. The first press plate 8 is provided with three bulging portions 9a, 9b, 9c constituting the tank portions 6a, 6b, 6c, and an opening 10 is provided in these bulging portions 9a, 9b, 9c. ing. When the second flat tube 2 is disposed adjacent to the second flat tube 2, the opening 10 is formed in the tank portion 6 a, 6 b, 6 c
The flat tubes 2B adjacent to each other in contact with each other are maintained at a constant interval, and the tank portions 6a, 6b, 6c communicate with each other. In addition, the first press plate 8 is provided with partition walls 11 extending in the longitudinal direction from the inner edges of the bulging portions 9a and 9c at both ends so as to protrude toward the inside facing each other. Are formed. When the peripheral edge, the partition wall 11 and the convex portion 12 of the opposed first press plate 8 abut, the substantially U-shaped flow path 7A that connects the tank portions 6a and 6c at both ends by a non-projecting portion is formed. It is formed and the central tank part 6b is closed.

The second flat tube 2B is shown in FIG.
A pair of second press plates 13A, 13 having a line-symmetric structure formed by pressing a metal plate such as aluminum shown in FIG.
B. These second press plates 13A, 13B
In the same manner as the first press plate 8, the tank portions 6a, 6
Three bulging portions 14a, 14b, 14 constituting b, 6c
c, and these bulging portions 14a, 14a
Openings 15 are provided in b and 14c. The second press plates 13A and 13B are provided with a partition wall 16 extending in the longitudinal direction from an inner edge of one end (right end) of the bulging portion 14c and a central bulging portion 14b.
7 are provided. The peripheral edges of the second press plates 13A and 13B opposed to each other, the partition wall 11 and the protruding portion 12 abut against each other, so that the non-projecting portion connects the one end (right end) tank portion 6c and the central tank portion 6b. A substantially U-shaped flow path 7B is formed, and the tank portion 6a at the other end (left end) is closed.

As shown in FIG. 1, the fin 3 has a corrugated shape formed by alternately bending a strip-like thin plate made of aluminum or the like having excellent thermal conductivity in a meandering manner.

The connecting member 4A is, as shown in FIG.
A supply pipe 34 of a heat exchange medium is connected to the connecting portion 20 which is disposed between the first flat tube 2A and the second flat tube 2B at the end, and protrudes from the flat tubes 2A, 2B. . This connecting member 4A is shown in FIG.
As shown in (A) and (B), a pair of half-shaped press plates 1
8 are joined. The half-shaped press plate 18 has a connection portion 20 for a pipe that bulges in a semicircular cross section at one end of a substantially rectangular substrate 19, and a substantially elliptical planar view that bulges to communicate with the connection portion 20. A first medium passage 21 having a shape, an annular second medium passage 22 swelling so as to communicate with the first medium passage 21, and a plan view swelling so as to communicate with the second medium passage 22. An annular third medium passage 23 is provided. A medium supply port 24 is formed in the first medium path 21, and communication ports 25 a and 25 b are formed in the substrate 19 surrounded by the second medium path 22 and the third medium path 23. At the edge of the medium supply port 24, a bent piece 24 that fits inside the edge of the opening 10, 15 of the flat tubes 2A, 2B.
a is provided. The edges of the communication ports 25a, 25b are joined to the edge of the communication port 25 of the other half-shaped press plate 18 in a sealed state, so that the tanks of the flat tubes 2A, 2B disposed on both sides of the connection member 4A. The openings 10 and 15 of the portions 6b and 6c communicate with each other.

The connecting member 4B is formed of a first flat tube 2
A discharge pipe 35 of a heat exchange medium is connected to a connection portion 28 disposed between the flat tube 2A and the second flat tube 2B, and protruding from the flat tubes 2A and 2B. This connection member 4B is formed by joining a pair of half-shaped press plates 26 shown in FIGS. 8A and 8B. These half-split press plates 26 include a connection portion 28 that bulges in a semicircular cross section at one end of a substantially rectangular substrate 27, a first medium passage 29 that is substantially annular in plan view and communicates with the connection portion 28, It has a second medium passage 30 having a planar elliptical shape communicating with the first medium passage 29 and a third medium passage 31 having an annular shape in plan view and communicating with the second medium passage 30. The second medium passage 30 is formed with a medium outlet 32 having a bent piece 32a in the same manner as the medium supply port 24, and the substrate 27 surrounded by the first medium passage 29 and the third medium passage 31 has: The communication ports 25a, 25
The communication ports 33a and 33b similar to b are formed.

The end plate 5 is provided outside the fins 3 provided outside the second flat tubes 2B at both ends to protect the fins 3 and to provide the flat tubes 2B.
The opening 15 is closed.

Next, an example of assembling the evaporator 1 will be described. First, flat tubes 2A and 2B in which a pair of first press plates 8 and second press plates 13A and 13B are superimposed are alternately arranged at regular intervals, and end plates 5 are arranged at both ends. In this state, FIG.
One end of the flow path 7A of the first flat tube 2A is opened in the middle and upper tank section 6a, one end of the flow path 7B of the second flat tube 2B is opened in the middle tank section 6b, and the lower The first and second flat tubes 2 are provided in the tank portion 6c.
The other ends of the flow paths 7A and 7B of A and 2B are opened. In the present embodiment, in order to compare with the conventional example shown in FIG. 9, the total number of the flat tubes 2 is set to the same number of 15, and the second flat tubes 2 are located at both ends.

Next, a connecting member 4 connected to a heat exchange medium supply pipe 34 between the flat tubes 2B and 2A at one end.
A is arranged, and the bent piece 24a of the connecting member 4A is inserted into the openings 10, 15 of the tank 6a of the flat tubes 2B, 2A and positioned. In addition, the adjacent flat tube 2
A connecting member 4B connected to the heat exchange medium discharge pipe 35 is disposed between A and 2B, and the bent piece 32a of the connecting member 4B is inserted into the openings 10 and 15 of the tank portion 6b and positioned. Further, the fins 3 are inserted between all of the adjacent first flat tubes 2A and the second flat tubes 2B, and between the flat tubes 2B and the end plates 5, and held by jigs (not shown).

When this temporary assembly is loaded into the furnace and heated, the press plates 8, 8, 13A, 13B are brazed, and the adjacent flat tubes 2A, 2B and the connecting members 4A, 4B are integrated. And the flat tubes 2A, 2B and the fins 3 are brazed and fixed.

Next, the flow of the heat exchange medium to each of the flat tubes 2A and 2B of the evaporator 1 having the above configuration will be described. As shown in FIG. 2, the heat exchange medium first flows into the upper tank portion 6a of the flat tubes 2A and 2B that communicate with each other via the supply pipe 34 and the connection member 4A.

Then, it flows into the flow path 7A of every other first flat tube 2A opened to the tank section 6a, and flows into the lower tank section 6c through the flow path 7A. Then, while passing through the flow path 7A, the heat exchange medium is vaporized as in the related art, so that heat is taken from the air passing outside the flat tube 2 and the outside air is cooled. At this time,
In this embodiment, since the cross-sectional area into which the heat exchange medium can flow is the same as the conventional one, the flow velocity at which the heat exchange medium passes through the flow path 7A is the same as the conventional one. Therefore, the heat exchange efficiency in the group of the first flat tubes 2A is the same as that in the related art.

Next, the heat exchange medium that has flowed into the lower tank section 6c is supplied to the flow path 2 of every other first flat tube 2A.
A flows through the openings 10 and 15 into the tank portions 6c of every other second flat tubes 2B adjoining on both sides, passes through the respective flow paths 7B of these flat tubes 2B, and between them, the outside air as described above. And flows into the middle tank portion 6b.

The heat exchange medium flowing into the middle stage flows into the medium outlet 32 of the connecting member 4B through the openings 10 and 15, and is discharged through the connecting member 4B and the discharge pipe 35.

As described above, in the evaporator 1 of the present invention, if only the heat conversion efficiency with respect to the outside air is viewed, the conversion can be performed with the same efficiency as the conventional one. In addition, in the configuration of the present invention, the first flat tubes 2 forming the upstream group
A and the second flat tube 2 constituting the downstream group
Since B and B are alternately laminated, it is possible to reliably prevent uneven heat conversion from being performed over the entire area of the evaporator 1 and to cool the outside air by making the temperature distribution uniform over the entire area. Can be.

In the above embodiment, the evaporator 1 has been described as a laminated heat converter. However, it is needless to say that the present invention can be applied to a condenser, an intercooler, an oil cooler, a radiator, and the like of an automobile.

[0026]

As is apparent from the above description, in the laminated heat exchanger of the present invention, a plurality of flat tubes are divided into two groups, an upstream side and a downstream side, and these flat tubes are alternately laminated. Therefore, heat exchange can be performed with a uniform temperature distribution over the entire region. As a result, when applied to an evaporator such as an air conditioner for a vehicle, it is possible to surely prevent a problem that the blowing temperature varies due to the air outlet and the temperature controllability is deteriorated.

[Brief description of the drawings]

FIG. 1 is a front view of an evaporator that is a stacked heat exchanger of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an exploded perspective view of a flat tube.

4A and 4B show an example of a flat tube, wherein FIG. 4A is a partially cutaway front view, and FIG. 4B is a sectional view taken along line IV-IV of FIG.

FIG. 5 shows a first press plate for forming a first flat tube, (A) is a front view of the first press plate, and (B) is a side view.

FIG. 6 shows a pair of second press plates for forming a second flat tube, (A) is a front view of one press plate,
(B) is a front view of the other press plate, and (C) is a side view.

FIG. 7 shows a connecting member connected to the supply pipe,
(A) is a plan view, and (B) is a sectional view taken along line VII-VII of (A).

FIG. 8 shows a connecting member connected to the discharge pipe,
(A) is a top view, (B) is a sectional view taken along line VIII-VIII of (A).

9A and 9B show a conventional laminated heat exchanger, FIG. 9A is a front view showing a flat tube, and FIG. 9B is a sectional view.

FIG. 10 is a cross-sectional view of a conventional laminated heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Evaporator, 2 ... Flat tube, 3 ... Fin, 4
... Connecting member, 5 ... End plate, 6 ... Tank, 7 ...
Channel 8: First press plate 13: Second press plate 34
Supply pipe, 35 ... discharge pipe.

Claims (2)

[Claims] 1. A flat tube and a fin in which two press plates are joined and a flow path of a heat exchange medium is formed therebetween are alternately laminated, and the heat exchange medium supplied from a supply pipe is supplied to the press plate. In a laminated heat exchanger that flows inside the flat tubes and exchanges heat between the heat exchange medium and air flowing along the fins outside the flat tubes, the plurality of flat tubes are arranged on the upstream side and the downstream side. Divided into two groups, these flat tubes are alternately stacked,
The inlets of the flat tubes of the upstream group communicate with each other, the outlets thereof communicate with the inlets of the flat tubes of the adjacent downstream group, and the outlets of the flat tubes of the downstream group further communicate with each other. And a laminated heat exchanger. 2. The flat tube has three tank portions for flowing the heat exchange medium, and among these tank portions, a first flat tube having a flow path communicating the tank portions at both ends, and a first flat tube formed at one end. The tank section and the central tank section are communicated with each other to form a second flat tube forming the flow path, and one of these forms an upstream group, and the other forms a downstream group. The laminated heat exchanger according to claim 1, wherein the heat exchanger is configured.