JP2002168581A - Duplex type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fin manufacturing cost in a duplex type heat exchanger having a plurality of types of fins having different fin heights and integrated. SOLUTION: Knurl stripes 141 are formed on a radiator fin 122 having a large short diameter size (thickness size) and a low height of a tube. Thus, since a buckling strength of the fin 122 becomes smaller than that of a condenser fin 112, when corrugated fins 140 are manufactured, even when a fin height H2 of the fin 122 and a fin height H2 of the fin 122 have the same size, in the case of assembling, when a load F is operated, the height H2 of the fin 122 can be easily reduced. Accordingly, since the fins 122 and 112 can be manufactured by the same molding roller 211, an increase in a facility investment for manufacturing the fin 140 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound heat exchanger in which a plurality of heat exchangers are integrated, and is applied to a compound heat exchanger in which a radiator and a condenser for a vehicle are integrated. It is valid.

[0002]

2. Description of the Related Art As a combined heat exchanger in which a radiator and a condenser are integrated, the present applicant has already filed Japanese Patent Application No. Hei 11-2.
No. 42097 is filed. In this application, in order to prevent the size and mass of the duplex heat exchanger from becoming unnecessarily large, and to adjust the heat exchange capacity of the radiator and the condenser, As shown in FIG. 3, the thickness dimension (minor dimension in the minor axis direction) h1 of the condenser tube and the thickness dimension (minor dimension in the minor axis direction) h2 of the radiator tube are made different from each other to make the fin height (dimension between tubes) H1 of the condenser fins higher. By making the fin height dimension H2 of the radiator fin different, the heat radiation area of the capacitor and the heat radiation area of the radiator are made different.

[0003]

By the way, corrugated fins (hereinafter abbreviated as fins) formed in a wavy shape are as follows.
As is well known, a belt-shaped strip material is continuously formed into a wave shape by a gear-shaped forming roller while feeding the strip-shaped strip material in the longitudinal direction, but it is necessary to change the fin specifications (fin height, fin pitch, etc.). In general, it is necessary to change the gear setting and the module of the gear-shaped forming roller.

For this reason, in order to manufacture fins having different fin heights, forming rollers having different specifications for each type of fin height are required.
The capital investment for manufacturing the fins increases.

Further, the fins having different fin heights are developed (dimensions in the longitudinal direction of the strip before shaping).
Therefore, when two or more fins having different fin heights are integrally formed from a single band plate material, it is difficult to simultaneously form a corrugated shape with high dimensional accuracy due to the difference in developed dimensions.

As described above, it is difficult to reduce the manufacturing cost of fins in a composite heat exchanger in which a plurality of types of fins having different fin heights are integrated.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to reduce the manufacturing cost of fins in a multiple heat exchanger in which a plurality of types of fins having different fin heights are integrated.

[0008]

According to the present invention, in order to achieve the above object, a plurality of first tubes (1) formed in a flat shape through which a first fluid flows are provided.
11), a plurality of flat second tubes (121) through which the second fluid flows, and the first tubes (11).
1) and a first fin (112) disposed between the second tube (121) and a wavy first fin (112) disposed therebetween.
Corrugated fins (14) having corrugated second fins (122) integrally formed from a band-shaped band plate material together with 12).
0), the minor dimension (h2) of the second tube (121) is larger than the minor dimension (h1) of the first tube (111), and the second fin (122) has A plurality of knurls (141) extending in a direction substantially parallel to the major axis direction of the second tube (121) are formed.

Accordingly, the bending stiffness of the second fin (122) becomes smaller than the bending stiffness of the first fin (112), and the buckling strength of the second fin (122) is reduced.
It becomes larger than the buckling strength of 12).

Here, the buckling strength of the fin indicates a load until the fin is buckled and deformed when a load is applied to the fin from a direction orthogonal to the wave propagation in the wavy fin. As the buckling strength increases, the amount of deformation under the same load increases, and buckling becomes more difficult.

Therefore, the corrugated fin (140)
When manufacturing the second fin (122), even if the fin height of the second fin (122) is the same as the fin height of the first fin (112), the corrugated fin (140) and the second tube (1) are formed.
21) and the first tube (111) are assembled so as to reduce the fin height in the stacking direction.
Fin height can be easily reduced.

As a result, the second fin (122) and the first fin (112) can be manufactured by the same forming roller, so that capital investment for manufacturing the corrugated fin (140) increases. Can be suppressed.

Further, during the production of the corrugated fin (140), the second fin (12) is formed by the same forming roller.
2) and the first fin (112) can be manufactured, so that at the time of manufacturing the corrugated fin (140),
The deployment size of the second fin (122) and the first fin (11)
2) can be made equal to the developed size. Therefore, both fins (112, 122) can be easily formed into a wave shape with high dimensional accuracy.

As described above, according to the present invention, the production cost of corrugated fins can be reduced in a compound heat exchanger in which a plurality of types of fins having different fin heights are integrated.

According to the second aspect of the present invention, the plurality of knurls (141) extending in a direction substantially parallel to the major axis direction of the first tube (111) are also formed on the first fin (112). Further, a pitch dimension (P2) between the knurls (141) formed on the second fin (122).
Is characterized in that it is smaller than the pitch dimension (P1) between the knurls (141) formed on the first fin (112).

Accordingly, the buckling strength of the second fin (122) is larger than the buckling strength of the first fin (112). When assembling with the first tube (111), by applying a load that reduces the fin height from the stacking direction, the fin height of the second fin (122) can be easily reduced.

Since the first fin (112) is also provided with a knurl groove (141), the first fin (112)
Buckling strength of the first tube (112) can be adjusted when assembling the second tube (121) and the first tube (111), and the corrugated fin can be adjusted. (140) The manufacturing variation of the first tube (112) can be absorbed.

Incidentally, tentatively, knurled eyes (141)
After forming the slit (S) after forming the strip (202) into a wave shape, the strip (S) is not flat, including the knurls (141). Difficult to form.

According to the third aspect of the present invention, a slit forming step of cutting a part of the strip material (202) to form a slit (S) extending in the longitudinal direction of the strip material (202); After the end of the process, knurled (14
Since the method has a knurl groove forming step of forming 1) and a corrugation forming step of shaping the strip material into a wavy shape after the knurl groove forming step is completed, the slit (S) can be easily formed. Therefore, the productivity of the corrugated fin (140) can be improved.

Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
A combined heat exchanger according to the present invention is provided with a condenser (radiator, condenser) of a vehicle refrigeration cycle (vehicle air conditioner) and a radiator for cooling water (coolant) of a water-cooled engine (liquid-cooled internal combustion engine). Is applied to a united one. FIG. 1 shows a double heat exchanger 10 according to this embodiment.
0 is a perspective view seen from the air flow upstream side, and FIG. 2 is a perspective view seen from the water-cooled engine side (the air flow downstream side).

In FIG. 1, reference numeral 110 denotes a condenser (first heat exchanger) for exchanging heat between a refrigerant circulating in a refrigeration cycle and air to cool the refrigerant.
A plurality of condenser tubes 111 through which the refrigerant (first fluid) flows, condenser fins (first fins) 112 disposed between the condenser tubes 111 to promote heat exchange between the refrigerant and air, and condenser tubes 111 Each condenser tube 111 is disposed at both ends in the longitudinal direction.
It is composed of header tanks 113, 114, etc., which communicate with the tank.

Incidentally, the header tank 113 on the right side of the drawing is shown.
Is for distributing and supplying the refrigerant to each condenser tube 111, and the header tank 114 on the left side of the drawing collects and collects the refrigerant that has finished heat exchange in each condenser tube 111.

The condenser tube 111 is shown in FIG.
As shown in the figure, the multi-hole structure has a number of refrigerant passages 111a formed therein, and is formed in a flat shape by extrusion or drawing. The condenser fin 112 is integrated with a radiator fin 122 described later, and the details will be described later.

On the other hand, in FIG. 2, reference numeral 120 denotes a radiator for cooling the cooling water by exchanging heat between the cooling water flowing out of the water-cooled engine and air, and the radiator 120 through which the cooling water (second fluid) flows. Multiple radiator tubes 1
21, radiator fins (second fins) 122 disposed between the radiator tubes 121 to promote heat exchange between the refrigerant and the air, and radiator tubes 121 disposed on both ends in the longitudinal direction of the radiator tubes 121. It is composed of communicating header tanks 123, 124 and the like.

The header tank 123 on the left side of the paper is
The cooling water is distributed and supplied to each radiator tube 121, and the header tank 124 on the right side of the drawing collects and collects the cooling water that has completed the heat exchange in each radiator tube 121.

Further, the radiator tube 121 is provided as shown in FIG.
As shown in (1), it has a simple flat shape, and its minor axis dimension (thickness dimension) h2 is larger than the minor axis dimension (thickness dimension) h1 of the capacitor tube 111. And
In the present embodiment, the major diameters (widths) W1 and W2 of the tubes 111 and 121 are substantially equal, and the major axis direction is a direction along the air flow.

In this embodiment, since the minor diameter (thickness) h2 of the radiator tube 121 is larger than the minor diameter (thickness) h1 of the condenser tube 111, the fin height H2 of the radiator fin 122 is increased.
Is smaller than the fin height H1 of the condenser fin 112.

Incidentally, while the refrigerant flows through the condenser tube 111 while changing its phase from a gaseous refrigerant to a liquid-phase refrigerant, the cooling water flows through the radiator tube 121 without changing its phase. Tube 1
It is desirable that the cross-sectional area of the passage 21 be larger than the cross-sectional area of the condenser tube 111.

In FIG. 1 and FIG.
10 and 11 provided at the ends of the radiator 120.
0, 120 are side plates forming reinforcing members, and both tubes 111, 121, both fins 112, 122, both header tanks 113, 114, 123, 124 and side plate 130 are integrally joined by brazing. .

Next, the fins 112 and 122 will be described.

The two fins 112 and 122 are formed integrally with each other by a roller forming method from a band-shaped band plate material, and as shown in FIGS. 3 and 4, a plurality of bent ridges 112a and 122a are formed. And valleys 112b, 12
2b, adjacent peaks 112a, 122a and valley 11
It is a wavy shape composed of flat portions 112c and 122c connecting between 2b and 122b. Hereinafter, the integrated fins 112 and 122 are referred to as corrugated fins 140.

The flat portions 112c and 122c have
In order to prevent the temperature boundary layer from growing by disturbing the flow of air passing through both fins 112 and 122, louvers 112d and 122d are formed by cutting and raising a part of the fins 112 and 122d. A coupling portion f that partially couples the fins 112 and 122 with the fins 112 and the radiator fins 122 separated by a predetermined dimension W3 or more.
Are provided at a plurality of peak portions 112a and 122a.

Here, the predetermined dimension W3 is a dimension larger than at least the plate thickness of both fins 112 and 122, and as shown in FIG.
When the inclination angle θ1 of 2c and the inclination angle θ2 of the plane portion 122c of the radiator fin 122 are made different, the torsional deformation can be made to such an extent that the inclination angles θ1 and θ2 of both the plane portions 112c and 122c can be absorbed. Dimensions of the order.

As shown in FIGS. 3 and 4, the condenser fin 112 and the radiator fin 122 are
The slits (spaces) S formed by being separated from each other by three or more function as heat transfer suppressing means for suppressing transfer of heat from the radiator 120 to the condenser 110.

Also, the radiator fin 122 has a structure shown in FIG.
As shown in FIG. 5, a plurality of knurls 141 extending in a direction substantially parallel to the major diameter direction of the radiator tube 121 are formed. The knurled eyes according to the present embodiment are:
As described in JIS B 0951, the radiator fins 122 are provided with fine undulations (folds formed by connecting wavy peaks or valleys) throughout the radiator fins 122.

Next, a manufacturing apparatus and a manufacturing method of the corrugated fin 140 will be described.

FIG. 6 is a schematic view of a roller forming apparatus 200. In FIG. 6, reference numeral 201 denotes a material roll around which a thin strip member 202 is wound. The tension is given by a tension device (uncoiler) 203 for giving a predetermined tension to the band plate member 202.

The tension device 203 includes a weight tension portion 204a for applying a constant tension to the band material 202 by gravity, a roller 205 rotating with the advance of the band material 202, and the belt material 20 via the roller 205.
2 and a roller tension portion 207 composed of a spring means 206 for applying a predetermined tension to the roller 2.

The predetermined tension is applied to the band plate material 202 by the tension device 203 because the corrugated fin 140 is bent and formed by the corrugating fin 140 described later.
a, 212a and the valleys 112b, 122b).

Reference numeral 208 denotes a slit forming apparatus which cuts a part of the strip 202 and forms a slit S extending in the longitudinal direction of the strip 202 (in the feeding direction of the strip 202).
Reference numeral 09 denotes a knurl groove forming apparatus for forming knurls 141 in the band plate member 202.

Each of the forming devices 208 and 209 is composed of a pair of rollers provided with a cutter (blade) on an outer peripheral surface of a cylindrical roller. And a knurl 141 are formed.

Reference numeral 210 denotes a strip plate 2021a to which a predetermined tension is applied by a tension device 203, which is formed with a number of peaks 112a, 122a and valleys 112b, 122b to form a wavy shape, and to form flat portions 112c, 212
This is a fin forming device that forms the louvers 112c and 122c at a portion corresponding to c.

The fin forming apparatus 209 includes a pair of gear-shaped forming rollers 211 and cutters (not shown) forming louvers 112c, 212c provided on the tooth surface of the forming roller 11. When the band plate member 202 passes between the forming rollers 211, it is bent along the teeth of the forming roller 211 to form the peaks 112a, 122a and the valleys 112b, 122b, and the louvers 112c, 212c are formed. Is done.

Reference numeral 212 denotes a wavy strip member 202.
Ridges 112a, 122a and valleys 112b, 122b
And a friction device that generates a frictional force in the direction opposite to the feeding direction of the band plate material 202 in contact with the
Numeral 12 is disposed on the feed direction side of the band member 202 with respect to the fin forming device 210, and is provided by a feed force of the band member 202 generated by a feed device (not shown) and a friction force generated by the brake device 212. The ridges 112a, 1 of the strip 202
This is for compressing the band plate member 202 such that the ridges 22a and the valleys 112b and 122b are in contact with each other.

Next, the operation of the corrugated fin forming apparatus 200 according to this embodiment will be described in the order of steps performed in the corrugated fin forming apparatus.

The strip 202 is pulled out from the material roll 201 (drawing step).
A predetermined tension is applied in the feeding direction of the strip 202 (tension generating step). Then, the slit S is formed by the slit forming device 208 (slit forming process), and then the knurls 141 are formed by the knurling groove forming device 209 (knurling groove forming process).

Next, the band plate material 2 was set at the fin forming equipment value 209.
02 is formed into a wavy shape, and the louvers 112c, 21
2c is formed (corrugate forming step), and then the band plate material 202 is contracted by the brake device 212 (shrinking step).

Then, the band plate material 202 which has completed the shrinking process
Is stretched by its own elastic force to become a predetermined fin pitch, and the molding of the corrugated fin is completed through an inspection process such as a dimensional inspection.

Next, the features (effects) of this embodiment will be described.

According to the present embodiment, since the knurls 141 are formed on the radiator fins 122 having a large minor diameter (thickness) and a low fin height of the tube, the bending stiffness of the radiator fins 122 is reduced by the condenser fins. Thus, the buckling strength of the radiator fin 122 becomes larger than the buckling strength of the condenser fin 112.

Here, the buckling strength of the fin indicates a load until the fin buckles and deforms when a load F indicated by an arrow in FIG. 3 is applied to the fin. Becomes larger, the amount of deformation under the same load increases, and buckling becomes more difficult.

Therefore, when manufacturing the corrugated fin 140, the fin height H2 of the radiator fin 122
When the corrugated fin 140 (radiator fin 122 and capacitor fin 112) and the radiator tube 121 and capacitor tube 111 are assembled so as to be stacked, even if the fin height H1 of the capacitor fin 112 and the fin height H1 are the same, By applying a load F that reduces the fin height from the height, the fin height H2 of the radiator fin 122 can be easily reduced.

For this reason, since the radiator fin 122 and the condenser fin 112 can be manufactured by the same forming roller 211, it is possible to suppress an increase in capital investment for manufacturing the corrugated fin 140.

When the corrugated fin 140 is manufactured, the radiator fin 122 and the condenser fin 112 are manufactured by the same forming roller 211.
At the time of manufacturing the corrugated fin 140, the developed size of the radiator fin 122 and the developed size of the capacitor fin 112 can be made equal. Therefore, both fins 112 and 122 can be easily formed in a wave shape with high dimensional accuracy.

As described above, according to the present embodiment, the production cost of corrugated fins can be reduced in a compound heat exchanger in which a plurality of types of fins having different fin heights are integrated.

By the way, if the knurls 141 are formed, and then the strip 202 is formed into a wavy shape, and then the slit S is formed,
It is difficult to form the slits S, since the slits S are not flat.

On the other hand, in the present embodiment, the knurls 141 are formed after the slits S are formed, and then the band plate member 202 is formed into a wavy shape, so that the slits S can be easily formed. . Therefore, the productivity of the corrugated fin 140 can be improved.

(Second Embodiment) In the first embodiment, the knurls 141 are provided only on the radiator fins 122, but in the present embodiment, as shown in FIG. In addition to the knurls 1 in the fin (the radiator fin 122 in this example) having the larger thickness dimension of the tube,
The pitch dimension P2 between the fins 41 is set to the smaller fin thickness of the tube (in this example, the condenser fin 112).
Is smaller than the pitch dimension P1 between the knurls 141 in FIG.

As a result, the buckling strength of the radiator fin 122 becomes greater than the buckling strength of the capacitor fin 112, so that when the radiator tube 121 and the condenser tube 111 are assembled together, By applying a load F that reduces the fin height from the height, the fin height H2 of the radiator fin 122 can be easily reduced.

Further, since the fin groove 141 is also provided in the condenser fin 112,
Fin 11 according to the first embodiment
2, the fin height H1 of the condenser tube 112 can be adjusted when assembling the radiator tube 121 and the condenser tube 111, and the manufacturing variation of the corrugated fin 140 (condenser tube 112) is absorbed. can do.

(Other Embodiments) In the above-described embodiment, the fins are provided with knurls by providing fine undulations throughout the radiator fins 122, but the present invention is not limited to this. The fins 141 may be formed by partially reducing the thickness of the fins (to be depressed in the thickness direction). In addition, JIS B 09
The knurls indicated by reference numeral 51 have a triangular wave shape, but the present invention is not limited to this, and may have another wave shape such as a sine wave or a rectangular wave.

In the above embodiment, both fins 11
Although the corrugated fins 2 and 122 have a substantially sinusoidal shape, they may be corrugated fins having a substantially rectangular shape.

In the above embodiment, the slit S
Has a predetermined width dimension (W3), but may be a slit S cut in a linear shape so that the width dimension (W3) is extremely small. In this case, in order to make the inclination angle θ1 of the flat portion 112c of the condenser fin 112 different from the inclination angle θ2 of the flat portion 122c of the radiator fin 122, the connecting portion f is formed at a plurality of peak portions 112.
a and 122a must be set.

In the above-described embodiment, the condenser of the vehicle refrigeration cycle and the radiator for cooling the cooling water of the water-cooled engine are integrated, but the present invention is not limited to this. And other heat exchangers.

In the above embodiment, the minor dimension h2 of the radiator tube 121 is
1, the present invention is not limited to this. The minor diameter h2 of the radiator tube 121 is changed to the minor diameter h1 of the condenser tube 111.
It may be smaller.

[Brief description of the drawings]

FIG. 1 is a perspective view of a compound heat exchanger according to an embodiment of the present invention, as viewed from an airflow upstream side.

FIG. 2 is a perspective view of the compound heat exchanger according to the embodiment of the present invention as viewed from the downstream side of the air flow.

FIG. 3 is a cross-sectional view of the duplex heat exchanger according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a corrugated fin used in the compound heat exchanger according to the first embodiment of the present invention.

FIG. 5 is a front view of a corrugated fin in the compound heat exchanger according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of a roller forming apparatus for manufacturing corrugated fins of the compound heat exchanger according to the first embodiment of the present invention.

FIG. 7 is a perspective view of a corrugated fin used in a compound heat exchanger according to a second embodiment of the present invention.

[Explanation of symbols]

111: condenser tube (first tube), 112
... condenser fins (first fins), 121 ... radiator tubes (second tubes), 122 ... radiator fins (second fins), 141 ... knurl grooves.

Claims (3)

[Claims] A plurality of flat first tubes (111) through which a first fluid flows, and a plurality of flat second tubes (121) through which a second fluid flows. A wavy first tube disposed between the first tubes (111);
A corrugated fin (140) having a fin (112) and a wavy second fin (122) disposed between the second tube (121) and integrally formed from a band-shaped strip with the first fin (112); ), A dimension (h2) in the minor axis direction of the second tube (121).
Is the minor dimension (h) of the first tube (111).
1), and a plurality of knurls (141) formed in the second fin (122) in a direction substantially parallel to the major axis direction of the second tube (121) are formed. Heat exchanger. 2. The first fin (112) is also provided with a plurality of knurls (141) extending in a direction substantially parallel to the major axis direction of the first tube (111). The pitch dimension (P2) between the knurls (141) formed on the fins (122) is the first dimension.
Knurl eyes (141) formed on fins (112)
The double heat exchanger according to claim 1, wherein the pitch is smaller than a pitch dimension (P1) between them. 3. The method of manufacturing a corrugated fin (140) according to claim 1, wherein a part of the strip (202) is cut off, and the strip (2) is cut.
02), a slit forming step for forming a slit (S) extending in the longitudinal direction, and after the slit forming step, the knurled eye (1) is formed.
41) A method of manufacturing a corrugated fin, comprising: a knurl groove forming step of forming the knurl groove; and, after the knurl groove forming step, a corrugate forming step of forming the band plate material into a corrugated shape.