DE102006050319A1 - A method for manufacturing a tubular evaporator heat exchanger has two side walls and internal fins the ends of which are crimped together - Google Patents

Abstract

The tube walls (11b) enclose a corrugated fin plate (12) and one wall end (11c2) is folded over the end (11c1) of the other wall with the end of the fin (12c) between them. A fold (12c1) retains the fin plate during the pressing operation.

Description

The The present invention relates to heat exchanger tubes, for example an evaporator, and has a method for its production to the subject.

at a heat exchanger feature the pipes over Internal ribs. The tubes will be with the inner ribs or fins For example, prepared by a method as described in Japanese Patent Publication No. 2003-336989. The following are the pipes with Inner ribs referred to as "inner finned tubes" Each of the inner finned tubes is a corrugated or ribbed inner fin arranged in a tube wall of flat tubular shape.

The Pipe wall is formed, for example, by a band plate on a Middle part is folded and bent over and the ends of the folded Beveled, flattened or crimped band sheets. The tube has one bent part at a first end and a beaded part a second end in cross-section, which is defined in one direction perpendicular to the longitudinal axis of the pipe. The inner rib is formed by a band plate in a waveform is brought.

The Inner rib is arranged in the tube such that its first end is in contact with an inside of the bent part of the pipe wall and its second end between the bead ends of the pipe wall is interposed. The ends of the pipe wall are in fact in folded over in a state where the second end of the inner rib between them is interposed to shift the inner rib to limit in the pipe wall.

There the displacement of the inner rib is reduced, can the above Inner finned tube continuously manufactured at high speeds become. How, namely in the Japanese Patent Publication Publication No. 2003-336989, the pipe wall and the inner fin continuously formed, and the inner fin is in the pipe wall inserted in the same roll forming process.

at However, the above-mentioned inner finned tubes are in danger of when the ends of the folded tube wall folded into a state be inserted with the second end of the inner rib between them is that the inner rib may be due to shrinkage of a corrugated part of the inner rib displaced or is moved. If the inner rib is moved, it is difficult stable and uniform to form a folded end on the pipe wall. In addition, can It can easily happen that connecting parts between an inner surface of the Tube wall and the inner rib are moved.

The Invention was made in view of the above, and it is An object of the present invention is to provide a tube for a heat exchanger make that possible makes a fin or fin with respect to a pipe element position.

A Another object of the invention is to provide a process for the production a pipe for one heat exchangers to be able to provide a rib with respect to one Position pipe element.

One Still another object of the invention is a pipe for a heat exchangers and to provide a method of manufacturing the pipe in which the ends of a tubular element stably beaded, folded or crimped.

According to one The first aspect of the present invention comprises a heat exchanger a pipe member and a rib inserted into the pipe member. The Pipe element has a first wall and a second wall facing each other. The first wall has a first end portion and the second wall a second end part. The second end part is folded over the first end part, bent or doubled. The rib has an end between held the first end portion and the second end portion of the tubular element becomes. Furthermore, the end of the rib has a curved rib portion over one End of the first end part of the tubular element. The curved rib part contacted the end of the first end portion for positioning the rib with respect to Tube.

at the production of the tube, the tubular element is formed and has a first wall and a second wall. The second end part of the second Wall is bent after the rib has been inserted into the pipe element. Also, the second end part is folded in a state such that the end of the rib between the first end part and the second end part is held and the curved Rippenendteil in engagement with the first end part comes. For example, the curved rib part be formed before the second end portion of the tubular element folded becomes. Alternatively, the curved rib portion may be formed when the second end part of the tubular element is folded or bent over.

Because the rib in relation to the tubular element is positioned by the curved rib portion, the second end portion of the tubular member is stably folded over the first end portion and the end of the rib. Thus, the first end part and the second end part of the pipe member are stably or uniformly beaded or folded.

Corresponding For example, a plurality of tubes can be uniformly shaped. At a heat exchangers with these pipes a distance or clearance is uniform between defined one end of each tube and a pipe feedthrough of a header tank. Therefore, the connection quality becomes improved between the pipes and the collector tank.

For example embodiments The invention will now be described with reference to the accompanying drawings be explained in more detail, in which like parts are designated by the same reference numerals are. Show in:

1 a cross-section through an inner fin tube, seen in a direction perpendicular to the longitudinal axis of the inner fin tube according to a first embodiment of the invention;

2 an enlarged view of the inner fin tube to a part of the circle II in 1 is designated;

3 a schematic side view of a heat exchanger with inner finned tubes according to the first embodiment of the present invention;

4 a flow diagram of an apparatus for producing the inner finned tubes according to the first embodiment of the present invention;

5 an explanatory illustration showing the beading or folding operation performed by the apparatus according to the first embodiment of the invention;

6 a schematic section through an inner fin tube at a Umfalzschritt an inner fin tube in the manufacturing method according to the second embodiment of the present invention; and

7 a schematic section through an inner fin tube in another stage of Umfalzung or beading according to the second embodiment of the invention.

First Embodiment

A first embodiment of the present invention will now be described with reference to FIGS 1 to 5 be explained. As in 1 shown has an inner finned tube 10 according to the first embodiment via a tubular element 11 and an inner rib 12 that fit into the pipe element 11 is used. 3 lets recognize how the inner finned tube 10 for example as a pipe of a heat exchanger 20 , For example, an evaporator of a refrigeration cycle is used.

The pipe element 11 is of flat tubular shape. The pipe element 11 is formed by folding or bending a thin strip of aluminum. 1 leaves in cross-section in a direction perpendicular to the longitudinal direction of the tubular element 11 the pipe element 11 of substantially elliptical shape. In 1 an arrow A1 indicates the direction parallel to the major axis of the elliptical shape.

The band plate is folded or bent substantially in the central part, so that the tubular element 11 flat sheet metal parts 11b and a bent part 11a at the ends of the flat sheet metal parts 11b Has. The curved part 11a has, for example, circular arc shape. Also has the curved part 11a about a shape corresponding to the part of a circle of a diameter equivalent to the distance between the flat sheet metal parts 11b of the tubular element 11 is. Alternatively, the curved part has 11a another shape, such as V-shape or console or hook shape (bracket-shape).

The flat band parts 11b go from the bent part 11a from. As 2 shows, have the flat band parts 11b over inclined wall parts 11c3 . 11c4 at the ends, the bent part 11a are opposite. The inclined wall parts 11c3 . 11c4 are against a midline between the flat band parts 11b inclined to form a V-shape. Furthermore, the flat strip or sheet metal parts 11b over a first end part 11c1 and a second end part 11c2 at the ends of the inclined wall parts 11c3 respectively. 11c4 , The first end part 11c1 and the second end 11c2 are squeezed or crushed or folded.

For example, the second end part overlaps 11c2 and is about the first end part 11c1 folded. In particular, the second end part 11c2 a length equal to or greater than twice the first end portion 11c1 is. The second end part 11c2 has a first part extending from the end of the inclined wall part 11c4 parallel to and opposite to an inner surface of the first end portion 11c1 a second part starts from this first part and is beyond the end of the first end part 11c1 doubled, and a third part extends from the second end portion along an outer wall of the first end portion 11c1 from. The third part terminates at a location adjacent to a boundary between the first end portion 11c1 and the inclined wall part 11c3 ,

Thus, a beaded part 11c at one end opposite the curved part 11a Shaped by the ends of the flat band parts 11b be folded over, ie by the second end part 11c2 over the first end part 11c1 is folded. Here, beading, crimping or crimping means construction in which the first end part 11c1 and the second end part 11c2 be closed by the second end part 11c2 over the first end part 11c1 is folded.

As the 1 and 2 let recognize, becomes the second end part 11c2 folded and over the first end part 11c1 so "wrapped" that both surfaces of the first end part 11c1 generally in the folded second end portion 11c2 be included. In this embodiment, the beaded or folded part has 11c a generally flat shape. The sill part 11c extends from the inclined wall parts 11c3 . 11c4 over a length that is substantially equal to the distance between the flat strip parts 11b is.

The inner rib 12 is used to create a turbulence effect in the pipe element 11 to cause flowing fluid and increase the heat transfer area to.

The inner rib 12 is formed of a thin aluminum strip sheet, which is thinner than the band plate of the tubular element 11 as a result of roll forming. Also, the inner rib 12 with a corrugated part 12a formed by waveform.

In addition, the inner rib has 12 a first flat sheet metal part 12b and a second flat sheet metal part 12c at the ends, based on the width of the band plate. The inner rib 12 gets into the pipe element 11 inserted such that the first flat part 12b in contact with an inner wall of the bent part 11a of the tubular element 11 comes. Furthermore, the first end part 11c1 and the second end part 11c2 of the tubular element 11 folded or crimped in a state such that the second flat part 11c between the first end part 11c1 and the second end part 11c2 is stored.

Furthermore, the second flat part 12c with a curved part 12c1 shaped. The curved part 12c1 is formed by one end of the second flat part 12c is bent substantially in an L-shaped configuration. The curved part 12c1 contacted and partially covers the end of the first end part 11c1 of the tubular element 11 , The curved part 12c1 is parallel to an end face of the first end part 11c1 , Thus, the curved part provides 12c1 a hook part which engages or is held on the end of the first end part 11c1 ,

The curved part 12c1 determines a location of the inner rib 12 with respect to the tubular element 11 against a force in the inner rib 12 is generated, for movement against the inside of the tubular element 11 before the soldering step is performed. The curved part 12c1 namely serves as a positioning element for positioning the inner fin 12 with respect to the tubular element 11 ,

The curved part 12c1 has a length in a direction perpendicular to the first part 11c1 equal to or less than the thickness of the first end portion 11c1 is. Preferably, the bent part 12c1 the largest possible length within the thickness of the first end part 11c1 , The curved part 12c1 can over the entire end of the second end part 12c in a longitudinal direction of the inner rib 12 be formed. Alternatively, the bent part 12c1 partially or at intervals in the longitudinal direction of the inner rib 12 be formed.

The inner finned tubes 10 of the above configuration are shown at predetermined intervals, shown in FIG 3 , stacked. Furthermore, outside ribs 21 between the inner finned tubes 10 interposed. Each of the outer ribs 21 has a corrugated or ribbed shape similar to the inner ribs 12 , Thus, the stack forms of inner finned tubes 10 and outer ribs 21 a core part 22 for effecting the heat exchange between an inner and an outer fluid. Furthermore, longitudinal ends of the inner finned tubes 10 with a first collector tank 23 and a second collector tank 24 coupled. So this is how the heat exchanger 20 built up.

Both first collector tank 23 like second collector tank 24 are with pipe holes 23a (double dashed chain line in 2 ) educated. The longitudinal ends of the inner tubes 10 be in the tube holes 23a introduced and with the first collector tank 23 and the second collector tank 24 connected under soldering.

First collector tank 23 and second collector tank 24 are with a fluid inlet element 25 or a fluid outlet element 26 Mistake. Will the in 3 shown heat exchanger 20 used as an evaporator, a refrigerant flows as an inner fluid flowing in the cooling cycle, in the first header tank 23 through the fluid inlet element 25 , The coolant flows through the inner finned tubes 10 against the second collector tank. Then, the coolant flows out of the fluid outlet port 26 , Heat exchange takes place between the in the inner rip penrohren 10 flowing coolant and the outside of the core part 22 passing air. So while the coolant evaporates, the air is cooled. The air is used, for example, for air conditioning.

Next, a method for manufacturing the inner finned tubes 10 with reference to the 4 and 5 to be discribed. 4 shows a device 100 for the production of inner finned tubes 10 ,

The manufacturing machine 100 has a tube forming unit 110 for shaping the tubular element 11 and for inserting the inner rib 12 in the pipe element 11 , an inner rib forming unit 120 for shaping the inner rib 12 , an inner rib transport unit 130 to the inner rib 12 to the tube forming unit 110 to wear etc.

Furthermore, the tube forming unit has 110 a shaping section for the tube outer wall 110A and an insertion and beading section 110B and a cutting station 110C , The sections 110A to 110C are arranged in series. The pipe outside wall 11 is molded using a belt sheet metal collar. Although not shown, there are roles between the respective sections 110A to 110C provided, for example, to promote the material. This is what happens in the respective sections 110A to 110C be carried out continuously.

The tube outer wall forming section 110A has multiple roles, mainly to the bent part 11a and the flat sheet metal parts 11b to form from the federal band material and this case a pipe outer wall as a pipe element 11 to build. The insertion and beading or crimping section 110B has multiple rolls R0 to Rn for forming the beaded or folded part 11c on the tube outer wall after inserting the inner rib 12 in the tube outer wall 11 , In the cutting section or the cutting section 110C becomes the continuously formed from the insertion and Umfalzabschnitt 110B worn element cut to predetermined length, whereby the individual inner finned tubes 10 be generated.

5 shows a step of beading or crimping in the insertion and beading section 110B is made. In the beading and insertion section 110B the rollers R0 to Rn are arranged in a progressive direction, ie in the conveying direction. Furthermore, each of the rollers R0 to Rn rotates while the second end part 11c the pipe outer wall 11 to contact.

Moreover, the rollers R0 to Rn are arranged such that the directions of the axes of rotation of the rollers R0 to Rn from a position A0 to a position An, as in FIG 5 to see, change. That is, the axis of rotation A0 of the roller R0 is parallel to the original direction of the second end portion 11c2 , An axis of rotation The roller Rn is parallel to the axis of rotation A0 or roller R0. Rollers between the roller R0 and the roller Rn are arranged so that their axes of rotation are gradually angled from the axis of rotation A0 to the axis of rotation An.

Thus, the rotation axes are changed by 180 degrees from the rotation axis A0 in the rotation axis An. This will be the second end part 11c2 , which is straight before folding over the first end part 11c1 folded by the rollers R0 to Rn. So is the beaded or folded part 11c shaped.

The inner rib forming unit 120 is parallel to the forming section 110a arranged for the Rohraußenwandung such that the molded inner rib 12 separated from the tube outer wall 11 in the outer wall forming section 110a has been formed by a predetermined distance in the horizontal direction and under the tube outer wall 11 is positioned. The inner rib 12 is formed by using a material from a metal band. In the inner rib forming unit 110 become the wavy part 12a , the first and second flat parts 12b . 12c and the L-shaped bent part 12c1 molded, on the rollers or rollers (buying rollers) for the strip sheet material. Thus, an endless inner rib 12 shaped in the form of a longitudinal band.

The carrier unit 130 for the inner rib feeds the endless inner rib 12 from the inner rib forming unit 120 in the introductory and beading section 110B ,

In the above manufacturing machine 100 First, the tube outer wall 11 from the strip sheet material in the mold section 110A shaped for the outer wall (tube outer wall forming step). Also, on the inner rib forming unit 120 the endless inner rib 12 shaped. The endless inner rib 12 becomes the introductory and crimping section 110B through the inner rib support unit 130 transported.

Next will be in the insertion and crimping section 110B the endless inner rib 12 in the outer wall 11 of the endless tube introduced (insertion step). Then the second end part becomes 11c2 the pipe outer wall 11 continuously over the first end part 11c1 bent or doubled (crimping step). Thus, an inner fin endless tube is formed.

The introductory step is the bent a part 12c1 the inner rib 12 in engagement with the end of the first end part 11c1 the pipe outer wall 11 , The inner rib 12 namely, with respect to the tube outer wall 11 through the bent part 12c1 posi tioned. Then, in the crimping or crimping step, the second end part becomes 11c2 the pipe outer wall 11 sequentially over the first end part 11c1 folded or doubled by the rollers R0 to Rn under a condition that the second flat part 12c the endless inner rib 12 sandwiched between the first end part 11c1 and the second end part 11c2 comes, and the curved part 11c1 in engagement with the first end part 11c1 comes. Thus, even after the folding step, the bent part keeps 12c1 the state in by connecting with the first end part 11c1 engages.

After that is the endless inner finned tube 10 cut to predetermined length. The cut inner finned tubes 10 be regularly and within a predetermined range ( 110D ) arranged. So so are the individual inner finned tubes 10 for the heat exchanger 20 produced.

At the insertion and folding step, the bent part becomes 12c1 in contact with the end of the first end part 11c1 held. The inner rib 12 namely with regard to the tube outer wall 11 through the bent part 12c1 positioned. Thus, it is less likely that the inner rib 12 with respect to the outer wall 11 is moved. Therefore, in the crimping step, the bent part of the second end part becomes 11c2 stabilized or homogenized. The second end part 11c2 Namely becomes uniform over the first end part 11c1 bent or folded. So so are the inner finned tubes 10 , whose ends were folded uniformly prepared.

Furthermore, at the folding step, the second end part 11c2 over a corner of the bent part 12c1 the inner rib 12 bent. Thus, the second end part becomes 11c2 essentially 180 degrees above the curved part 12c1 while keeping the curved shape (R-shape). In addition, the second end part 11c2 uniformly a predetermined length L at a folded end, as in FIG 2 shown, maintained.

Since the folded part 11c is uniformly shaped, have the inner finned tubes 10 uniform outer shape. In the production of the heat exchanger 20 using the above-mentioned inner fin tube, clearances or clearances become substantially between the tube holes 23a the first and second collector tanks 23 . 24 and the ends of the plurality of inner finned tubes 10 Are defined. That's what the inner finned tubes are made of 10 and the first and second header tanks 23 . 24 securely united with each other.

In particular, the inner finned tubes 10 with the folded ends of the second end parts 11c2 may have substantially the same length L, the clearance or distance S, defined between each tube hole 23a and every inner finned tube 10 to be reduced. It is namely the inequality of the free spaces under the inner finned tubes 10 reduced. Thus, the quality of the soldering is improved.

The inner finned tubes 10 Be sure of the first and second header tanks 23 . 24 soldered. It is less likely that the internal fluid, for example, the coolant, through the connecting parts between the inner finned tubes 10 and the pipe penetrations or holes 23a the first and second collector tanks 23 . 24 licks. The reliability of the heat exchanger 20 will be improved.

In the above pipe element 11 are the flat sheet metal or plate parts 11b continuous through the bent part (connecting part) 11a on one side opposite the folded end 11c , The resistance of the inner finned tube 10 against a pressure of the inner fluid is thus improved.

Also, the length of the bent part 12c1 the inner rib 12 shorter than the thickness of the end of the first end part 11c1 , Thus, it is less likely that the bent part 12c1 disturbing with respect to the folded second end part 11c2 becomes.

Second Embodiment

A second embodiment of the invention will now be described with reference to FIGS 6 and 7 to be discribed. In this second embodiment, the inner finned tubes have 10 about the same shape as the inner finned tubes 10 the first in 1 shown embodiment. The manufacturing process for the inner finned tubes 10 however, it differs from that of the first embodiment. 6 leaves an early stage of the folding step for crimping or beading the first end part 11c and the second end part 11c2 detect. 7 shows an intermediate step of the Umfalzstufe.

In this second embodiment, the bent part becomes 12c1 the inner rib 12 at the same time as the folding of the second end part 12c1 made in the folding step. In other words, the bent part 12c1 does not become in the inner rib forming unit 120 carried out.

In the case of the inner rib 12 in the tube outer wall 11 is introduced at the introduction step, the second flat sheet metal or plate member 12c between the first end part 11c1 and the second end part 11c2 held, and the end of the second flat end portion 12c extends over a longer piece than the first end part 11c1 , as in 6 to see. Preferably, the end of the second flat sheet metal part is 12c from the end of the first end part 11c1 as far as possible by a size range smaller than the thickness of the first end portion 11c1 is.

If the second end part 11c2 is bent in the folding step, the end of the second flat sheet metal part 12c the inner rib 12 with the second end part 11c2 bent at one point, the end of the first end part 11c1 as bending base, shown in 7 , corresponds. This is how the curved part becomes 12c1 formed in the folding step. Also in this case it is because of the inner rib 12 with respect to the pipe outer wall 11 through the bent part 12c1 is less likely that the inner fin with respect to the tube outer wall 11 is moved in the folding step. The folded part 11c is thus shaped stable and uniform.

Also in this embodiment are the flat sheet metal parts 11b passing through the bent part (connecting part) 11a on one side, the folded end 11c opposite. The resistance of the inner finned tube 10 against a pressure of the inner fluid is thus improved. Also, the length of the bent part 12c1 the inner rib 12 smaller than the thickness of the end of the first end part 11c1 , It is thus less likely that the bent part 11c1 disturbing with respect to the folded second end part 11c2 becomes.

The use of inner finned tubes 10 according to the first and second embodiments is not limited to the evaporator. For example, the inner finned tubes can be 10 in other heat exchangers, for example, use radiators, Kodensatoren or heater cores.

Also, the shape of the inner rib 12 not on the corrugated or corrugated shape with the corrugated or corrugated part 12a limited. For example, the inner rib 12 Projections and grooves, which are arranged discontinuously or irregularly. Alternatively, the inner rib 12 designed with openings or the like.

In the above embodiments, the flat sheet metal parts 11b of the tubular element 11 consistently over the curved part 11a , However, the shape of the pipe member is 11 not limited to the above. For example, the flat sheet metal parts can be 11b crimp, fold over or crimp at both ends.

above were just example embodiments described. The invention is directed to these exemplary embodiments but not limited, can be implemented in other ways, without departing from the scope of the invention. It only became that for the Invention as essentially considered included.

Claims (12)

Pipe ( 10 ) for a heat exchanger, comprising: a tubular element ( 11 ) with a first wall ( 11b ) and a second wall ( 11b ) facing each other, the first wall ( 11b ) via a first end part ( 11c1 ), the second wall ( 11b ) via a second end part ( 11c2 ), and the second end part ( 11c2 ) over the first end part ( 11c1 ) is bent, folded or beaded; and a rib ( 12 ), arranged in the tubular element ( 11 ), the rib ( 12 ) over an end ( 12c ) located between the first end portion ( 11c1 ) and the second end part ( 11c2 ) of the tubular element ( 11 ), the end ( 12c ) of the rib ( 12 ) via a curved rib part ( 12c1 ), which has one end of the first end part ( 11c1 ) of the tubular element ( 11 ) is bent to the rib ( 12 ) with respect to the tubular element ( 11 ). Pipe ( 10 ) according to claim 1, wherein the first wall ( 11b ) with the second wall ( 11b ) via a bent pipe part ( 11a ) is connected on a side which is the first end part ( 11c1 ) and the second end part ( 11c2 ) faces. Pipe ( 10 ) according to claim 1 or 2, wherein the bent rib part ( 12c1 ) a dimension with respect to a direction perpendicular to the first end part ( 11c1 ) of the tubular element ( 11 ) which is equal to or smaller than a thickness of the first end portion ( 11c1 ). Pipe ( 10 ) according to one of claims 1 to 3, wherein the curved rib part ( 12c1 ) is substantially L-shaped. Heat exchanger ( 20 ) with a pipe ( 10 ) according to one of claims 1 to 4. Heat exchanger ( 20 ) according to claim 5, further comprising: a header tank ( 23 . 24 ), which with a plurality of tube holes or pipe penetrations ( 23a ) is formed, wherein the pipe ( 10 ) is one of a plurality of tubes, and ends of the tubes ( 10 ) in the tube holes 23a of the collector tank ( 23 . 24 ) are included. Method for producing a pipe ( 10 ) for a heat exchanger, comprising: molding a tubular element ( 11 ) for producing a first wall ( 11b ) with a first end part ( 11c1 ) and a second wall ( 11b ) with a second end part ( 11c2 ); Inserting a rib ( 12 ) between the first wall ( 11b ) and the second wall ( 11b ) of the tubular element ( 11 ); Crimping or beading of the second end part ( 11c2 ) of the second wall ( 11b ) over the first end part ( 11c1 ) of the first wall ( 11b ), such that one end ( 12c ) of the rib ( 12 ) between the first end part ( 11c1 ) and the second end part ( 11c2 ) is interposed, and the end ( 12c ) of the rib ( 12 ) in engagement with the first end part ( 11c1 ) of the first wall ( 11b ) by a curved rib part ( 12c1 ) comes. The method of claim 7, further comprising: forming the curved rib portion (FIG. 12c1 ) on the end ( 12c ) of the rib ( 12 ) before the introduction. The method of claim 7, wherein the crimping is bending the end (FIG. 12c ) of the rib ( 12 ) over one end of the first end part ( 11c1 ) of the tubular element ( 11 ) for forming the bent rib part ( 12c1 ). The method of claim 9, wherein said inserting comprises arranging said rib ( 12 ) such that the end ( 12c ) of the rib ( 12 ) from the first end part ( 11c1 ) of the tubular element ( 11 ) protrudes. Method according to one of claims 7 to 10, further comprising: cutting the tubular element ( 11 ) to a predetermined length after folding or beading. A method according to any one of claims 7 to 11, wherein: forming the tubular element ( 11 ) a folding of a sheet metal element to form the first wall ( 11b ), the second wall ( 11b ) and a bent part ( 11a ) between the first wall ( 11b ) and the second wall ( 11b ).