EP1936310A1 - Compact plate heat exchanger - Google Patents

Abstract

The radiator with housing (1) and panel pack (2) has a corrugated strip (18) with a uniform through corrugation structure in the rectangular heat transfer surface and head parts. A welded edge is formed at the edge region of the rectangular surface, running round its periphery. The inlet and outlet connections are welded by gas-tight welds.

Description

The invention relates to a compact plate heat exchanger with a plate pack of profiled heat transfer plates, which have a rectangular shape and are bounded on both sides by an arcuately shaped head with a centrally located in the head passage opening, each two heat transfer plates joined together, the plate gap for the flow of a first medium form over the passage openings, are gas-tight welded to each other at the periphery to a pair of plates and wherein at least two assembled plate pairs are gas-tight welded respectively to the circumference of the two openings to a plate package, which form a plate space for the flow of a second medium on the front side of the plate package, said the plate pack in a gas-tight and pressure-stable housing with a shell-side inlet and outlet ports for the first medium to flow through the Plattenzwisc henraums one or more pairs of plates and provided with frontal inlet and outlet nozzle for the second medium for flowing through the plate interspaces between two or more plate pairs on the front side of the plate pair.

A generic plate heat exchanger is out EP 697 09 719 T2 known. This plate heat exchanger consists of a plate pack formed of a plurality of circumferentially welded plate pairs, which are formed of elongated heat transfer plates with a continuous herringbone pattern that extends into the head portions which arcuately define the heat transfer plate and formed with a central flow opening are, in each case the mutually joined plate pairs are welded to the periphery of the adjacent passage openings to form a compact plate package. The heat transfer surface is formed with additional Presserhebungen which are slightly higher than the ribs and extending from the apex of a rib, thereby bridging the wave trough between the two ribs. In this case, the heat transfer plate is bounded by a peripheral edge region, which is in a plane with the apex of the ribs, wherein the press elevations extend from this plane. For internal stability of a plate pair or the plate package, the joined heat transfer plates are brazed by the addition of brazing solder at the points of contact. Such a trained plate package affected as a result of Presserhebungen the flow behavior of the media involved in the plate interspaces and has only low support points, which inevitably lead to reduce the pressure stability of the plate package. In addition, due to the herringbone pattern, the heat transfer plates do not have a uniform circumferential edge region, which considerably complicates a quality-compatible welding of two heat transfer plates to form a pair of plates.

Such a trained plate package is after the EP 697 09 719 T2 in a housing with a shell-side inlet and outlet to the plate interspaces of the plate pairs and with a frontal inlet and outlet for a second medium to the spaces between the plate pairs used. In this case, a connecting piece is arranged with an opening between the uppermost plate pair and an upper wall of the housing, which extends coaxially with the shell-side inlet and outlet of the housing and the passage openings of the plate pair.

These connectors are each brazed to the adjacent passage openings of the uppermost plate pair and sealed against the inner surface of the upper wall of the housing with seals and each have two threaded bolts, which are carried sealed by holes in the upper wall of the housing. With these threaded bolts, the plate pack is then pulled on the inner surface of the housing. With the attachment of the plate pack against the inner surface of the upper wall of the housing, the inner surface of the lower wall of the housing remains meaningless as an abutment for the plate pack.

Consequently, the pressure acting in the plate pack over the length of the plate pack and the weight of the plate pack is absorbed only via the braze joints between the heat transfer plates of the soldering of the shell-side inlet and outlet.

The result is that a plate heat exchanger of this type has only a very low pressure stability and thus is not available for use in the high pressure area. Irrespective of this, there is always the danger, even in the low-pressure range, that due to the prevailing pressure and the weight of the plate pack, in particular the solder joints between the connecting pieces and the openings of the uppermost plate pair will break off, which inevitably leads to a failure of the plate heat exchanger As a result, since it comes to mixing the two involved medium. By attachment to the inner surface of the upper wall of the housing but also occurs between the inner surfaces under the wall and the adjacent heat transfer plate of the plate pack reinforced a bypass of the front side flowing through medium, which significantly reduces the efficiency of the plate heat exchanger.

In addition, by the sealing of the connecting pieces to the inner surface of the upper wall of the housing and the necessary sealing of the bolts in the penetration of the upper wall of the housing a wear-free operation of the plate heat exchanger in the high pressure region and a wide temperature range is not guaranteed in each case.

From the DE 10 2004 022 433 A1 a heat transfer plate for a welded plate heat exchanger of the generic type is known, which has a rectangular shape, which is bounded at the two end faces with arcuate head parts, in each of which a centrally located flow opening is provided and, as in Fig.1 - 2 shown in the head portions and the rectangular portion of the heat transfer surface has a straight and transverse at an angle α to the longitudinal axis of the heat transfer plate extending wave structure, which forms in the edge region of the heat transfer surface and the head portions surrounding a peripheral profile-free welding edge of equal width. Such a formed wave structure has when joining two heat transfer plates over the entire length of the gap formed on a high number of punctiform support points, which largely preclude occurrence of preferential flows in the space due to the punctiform support.

Experiments have also surprisingly shown that extend through an equally wide profile-free circumferential welding edge and a plurality of point-shaped support points extending evenly over the length and width to the profile-free welding edge of a gap of two joined elongated heat transfer plates, as in a heat transfer plate after of the DE 10 2004 022 433 A1 the case is, a very high pressure resistance and also a good flow characteristics can be achieved.

The object of the invention is therefore to improve the plate heat exchanger mentioned above in that using a from the DE 10 2004 022 433 A1 known heat transfer plate, the thermal efficiency is increased by an improved flow characteristics, the plate heat exchanger sealless as a compact plate heat exchanger up in the high pressure range and also for a temperature range from -200 ° C to + 1200 ° can be used and manufactured more economically and can be operated service-free.

• die Wärmeübertragungsplatte in der rechteckigen Wärmeübertragungsfläche und der Kopfteile mit einem Wellenprofil versehen ist, das eine durchgehend einheitliche Wellenstruktur aufweist, die im Randbereich der rechteckigen Wärmeübertragungsfläche und der Kopfteile einen an der Peripherie der Wärmeübertragungsplatte umlaufenden profilfreien Schweißrand gleicher Breite ausbildet,
• die Ein- und Austrittsstutzen zu den Plattenzwischenräumen der Plattenpaare am Umfang der Durchtrittsöffnung der Wärmeübertragungsplatte des angrenzenden Plattenpaares sowie im Durchdringungsbereich der oberen bzw. unteren Gehäuseplatte des Gehäuse gasdicht verschweißt sind,
• das aus verschweißten Plattenpaaren gebildete Plattenpaket zwischen der oberen und der unteren Gehäuseplatte und den beiden parallel verlaufenden Seitenteilen des Gehäuses metallisch gedichtet im Gehäuse verspannt ist,
• die obere und untere Gehäuseplatte mit den parallel verlaufenden Seitenteilen des Gehäuses zu einem Gehäusemantel verschweißt sind, der beiderseits durch ein Stirnteil mit oder ohne Anschlussstutzen zu einem druckstabilen und gasdichten Gehäuse (1) verschlossen ist und
• einem Gehäuse, das mit mindestens zwei versetzt angeordneten und um den Gehäusemantel umlaufenden Rippen versteift ist.

This object is achieved by a compact plate heat exchanger, in which

• the heat transfer plate in the rectangular heat transfer surface and the head portions is provided with a corrugated profile having a continuous uniform wave structure forming in the edge region of the rectangular heat transfer surface and the head portions a profile-free welding edge of equal width encircling the periphery of the heat transfer plate,
• the inlet and outlet nozzle to the plate spaces of the plate pairs on the circumference of the passage opening of the heat transfer plate of the adjacent plate pair and in the penetration area of the upper or lower housing plate of the housing are gas-tight welded,
• the plate pack formed from welded plate pairs is clamped in a metallically sealed manner in the housing between the upper and the lower housing plate and the two parallel side parts of the housing,
• the upper and lower housing plate are welded to the parallel side parts of the housing to a housing shell, which is closed on both sides by a front part with or without connecting piece to a pressure-resistant and gas-tight housing (1) and
• a housing which is stiffened with at least two staggered and circumferential to the housing shell ribs.

A produced after these combination characteristics plate heat exchanger is a sealless and only metallic sealed pressure-stable and welded compact plate heat exchanger, which is suitable without further additional clamping means into the high pressure range and in a temperature range from -200 ° C to 1200 ° C.

By the use der.aus der DE 10 2004 022 433 A1 known heat transfer plate, the wave crests intersect when joining two mutually rotated by 180 ° heat transfer plates to the circumferential profile-free welding edge regularly and thus form over the entire width and length of the plate interspace regularly repeating support points. This gives each plate gap over the length and width of a very high pressure stability and additional connections of the respective adjacent support points can be omitted even if the plate interspaces between the welded plate pairs and the assembled plate pairs are supplied with media flowing through the compact plate heat exchanger with a very high pressure difference.

Due to the approximately punctiform intersection of the wave crests, which simultaneously form the support points, it can also be ruled out that unwanted preferential flows form in the plate interspace as they flow through the media, which, as is known, impair the flow characteristics of a plate interspace and thus reduce the thermal efficiency of the compact plate heat exchanger.

The punctiform supports of a plate gap occupy in addition only a very small part of the flow area. Consequently, the thermal effective flow area of each plate gap is minimally affected by the support points.

With the bracing of the plate pack through the upper and lower cover plate of the housing and the parallel side parts of the housing, which are gas-tight welded after clamping to a housing shell, it can be ensured on the one hand that each support point is acted upon in the plate gap with a uniform clamping force and so that the plate gap over the length and width has a same pressure stability and, secondly, the plate pack is metallically sealed via the upper and lower cover plate and the two parallel side parts, that a bypass flow between the plate pack and the housing through the medium, which the plate package flows through the front, but not completely excluded but is considerably minimized.

Due to the gas-tight welding of the shell-side inlet and outlet nozzles on the circumference of the passage opening of the adjacent heat transfer plate and the subsequent gas-tight welding of the two nozzles in the penetration and the gas-tight welding of the end portions of the housing of the compact plate heat exchanger is completely free of seals and thus serviceless usable.

Due to the stiffening of the housing with circumferential ribs, the housing also has a very high pressure stability, so that the compact plate heat exchanger can be acted in conjunction with the pressure-stable plate package also with a media pressure in the absolute highest pressure range in the heat transfer of two media. Rather, by the stiffening of the housing with circumferential ribs, the material thickness of the upper and lower housing plate and the two parallel side parts of the housing depending on the number of circumferential ribs and the intended use of Kompaktplattenwärmeübertragers can be reduced.

A designed according to the inventive teaching compact plate heat exchanger is also, as usual with bolted plate heat exchangers, in the modular system but also suitable for the production of automated manufacturing equipment and thus very economical to produce.

The attachment of the circumferential ribs on the housing can take place in different technological steps, wherein the following embodiments are preferably proposed.

The ribs are rib portions which are integral with the upper and lower housing plates and the side portions, wherein the respective adjacent ends of the individual rib portions after the clamping of the plate pack with the upper and lower housing plate and as the two parallel side parts are welded together.

However, the ribs can also be circumferential rib sections welded onto the housing jacket, wherein the ends of the adjacent ribs are welded.

But the ribs can also be in the form of the housing shell prefabricated closed ribs, which are shrunk on the housing shell.

Preferably, the end faces of the housing are gas-tight welded to the housing jacket.

However, it may also be advantageous for special applications of compact plate heat exchangers, if one or both end faces are releasably gas-tight and pressure-resistant fixed to the housing shell. In these cases, a detachable connection between the housing shell and the front side, which can be a Schaub connection, recommended using stud bolts.

Further details of the invention will become apparent from the following detailed description and the accompanying drawings, in which a preferred embodiment of a Kompaktplattenwärmeübertragers are shown.

Fig. 1:

einen geschlossenen verschweißten Kompaktplattenwärmeübertrager,

Fig. 2:

einen Schnitt A-A von Fig. 1,

Fig. 3:

einen Schnitt B-B von Fig. 1,

Fig. 4:

eine Wärmeübertragungsplatte für einen Kompaktplattenwärmeübertrager von Fig. 1,

Fig. 5:

ein schematisch dargestelltes Plattenpaket mit Wärmeübertragungsplatten nach Fig. 4.

In the drawings show:

Fig. 1:

a closed welded compact plate heat exchanger,

Fig. 2:

a section AA of Fig. 1 .

3:

a section BB of Fig. 1 .

4:

a heat transfer plate for a compact plate heat exchanger of Fig. 1 .

Fig. 5:

a schematically illustrated plate pack with heat transfer plates after Fig. 4 ,

As in Fig. 1 can be seen, there is a compact plate heat exchanger from a housing 1, a in Fig. 1 unrecognizable plate pack 2, which is clamped metallically sealed over the axially extending inner surfaces of the housing 1, the shell side arranged inlet nozzle 13 (14) and outlet nozzle 14 (13), the frontal inlet nozzle 15 (16) and outlet nozzle 16 (15) and the ribs 16 - 16x, the spaced apart the housing shell of the housing 1 rotate in a closed form.

The housing 1 is composed of a separate upper and lower housing plate 21, 22 and separately parallel side parts 23, 23 a, which are gas-tight welded at the longitudinal sides to a housing jacket, on both sides by a front part 24; 24a with an inlet or outlet pipe 15; 16 is closed to a gas-tight fully welded housing 1.

The housing parts 21, 22 and side parts 23, 23a forming the housing 1 are designed in a dimension in which a inserted plate package 2 is clamped metallic sealed in the horizontal and in the vertical plane in the housing 1 and between the two end faces 12; 12a of the plate pack 2 and the end parts 24; 24a of the housing 1, a free inlet or outlet area remains.

The dimension of the free inlet and outlet area is preferably designed in such a size that the end face 12 (12a) of the plate pack 2 is always uniformly charged with the medium which flows into the compact plate heat exchanger via the inlet connection 15 (16) or evenly over on the outlet side the end face 12a (12) flows out of the plate pack 2 and the outlet nozzle 16 (15) out of the compact plate heat exchanger.

The shell-side inlet and outlet nozzles 12; 13 of the Kompaktplattenwärmeübertragers for the flow of a medium through the openings of the heat transfer plate are each at the periphery 27; 28 gas-tightly welded to the adjacent heat transfer plate 3 (4) and coaxially penetrate the upper and lower housing plates 21, respectively; 22 and are around the penetration area 25; 25a with the housing plate 21; 22 welded gas-tight.

As in Fig. 5 shown, the plate package 2 consists of pairs of plates 5 - 5x, the circumference 27; 28 of the passage openings 8; 9 gas-tight welded and form a plate interspace 10 for the flow of a medium over the end face 12, 12 a of the plate pack 2, wherein each pair of plates 5; 5x from two in Fig. 4 shown identical heat transfer plates 3, 4, which are rotated in its own plane by 180 ° relative to the other and along its peripheral edge region are gas-tight welded to a pair of plates 5 and thus form a plate gap 11 for the flow of a second medium via the passage openings 8, 9.

The heat transfer plates 3; 4 exist, as in Fig. 4 shown, of a rectangular heat transfer surface 17, which is bounded on both sides by arcuate head portions 6, 7, wherein the arc radius is preferably half the width of the heat transfer plate 3; 4 is. The rectangular heat transfer surface 17 and the head portions 6, 7 are provided with a corrugated profile 18 having a uniform wave structure which is straight at an equal angle α to the longitudinal axis and into the edge region 19 of the heat transfer plate 3; 4 runs and in the edge region 19 of the heat transfer plates forms a circumferential profile-free welding edge 20 of equal width.

reference numeral

1

casing

2

plate pack

3

Heat transfer plate

4

Heat transfer plate

5 - 5x

pair of plates

6

headboard

7

headboard

8th

Through opening

9

Through opening

10

Plate gap between 2 plate pairs

11

Plate gap in the plate pair

12, 12a

front

13

inlet connection

14

outlet connection

15

end entry ports

16

end-side outlet nozzle

17

rectangular heat transfer surface

18

wave profile

19

border area

20

profile-free welding edge

21

upper housing plate

22

lower housing plate

23, 23a

side panels

24, 24a

front part

25, 25a

Penetration area - housing

26, 26x

ribs

27

Circumference of the passage openings

28

Circumference of the passage openings

Claims (7)

Compact plate heat exchanger with - A plate package (2) of profiled heat transfer plates (3; 4), which have a rectangular shape and bounded on both sides by an arcuately shaped head part (6; 7) with a centrally in the head part (6; 7) lying through opening (8; are, wherein two mutually joined heat transfer plates (3, 4), which form a plate space (11) for the passage of a first medium through the passage openings (8, 9) are gas-tight welded to each other at the periphery to a pair of plates (5) and wherein at least two assembled pairs of plates (5, 5x) are each gas-tightly welded to a plate pack (2) at the periphery (27; 28) of the two passage openings (8; 9), which has a plate interspace (10) for the passage of a second medium over the end faces (12, 12 a) of the plate pack (2) form and - A gas-tight and pressure-stable housing (1) with a shell-side inlet and outlet nozzle (13, 14) for the first medium for flowing through the plate gap (11) of one or more pairs of plates (5-5x) and frontal inlet and outlet nozzle (15; 16) for the second medium for flowing through the plate interspaces (10) between two or more plate pairs (5-5x) over the end faces (12, 12a) of the plate pack 2, characterized in that - the heat transfer plate (3; 4) in the rectangular heat transfer surface (17) and the head parts (6, 7) is provided with a corrugated profile (18) having a continuous uniform wave structure, which in the edge region (19) of the rectangular heat transfer surface (17 ) and the head parts (6, 7) forms a profile-free welded edge (20) of equal width circulating on the periphery of the heat transfer plate (3; - the inlet and outlet ports (13, 14) to the plate spaces (11) of the plate pairs (5-5x) on the periphery (27, 28) of the passage opening (8, 9) of the heat transfer plate (3, 4) of the adjacent plate pair (5 ; 5x) and in the penetration area (25; 25a) of the housing plates (21; 22) of the housing (1) are gas-tight welded, - The formed of welded plate pairs (5-5x) plate package (2) between the upper and lower housing plate (21, 22) and the parallel side parts (23, 23a) of the housing (1) is clamped metallically sealed, - The upper and lower housing plate (21, 22) with the parallel side parts (23, 23a) of the housing (1) are welded to a housing shell, on both sides with a front part (24, 24a) with or without connecting pieces (15; ) is closed to a pressure-resistant and gas-tight housing (1) and - A housing (1) which is stiffened with at least two staggered and circumferential to the housing shell ribs (26 - 26x). A compact-plate heat exchanger according to claim 1, characterized in that said ribs (26-26x) are rib portions integral with said lower and upper housing plates (21, 22) and said side members (23, 23a), the adjacent ends of said individual rib portions respectively after the clamping of the plate package (2) with the housing plates (21, 22) and the side parts (23, 23a) are welded together. Compact plate heat exchanger according to claim 1, characterized in that the ribs (26-26x) are rib sections welded onto the housing jacket, which are respectively welded at the adjacent ends. Compact plate heat exchanger according to claim 1, characterized in that the ribs (26 - 26x) in the form of the housing shell prefabricated closed ribs (26 - 26x) are shrunk onto the housing shell. Compact plate heat exchanger according to one of claims 1 to 4, characterized in that the end parts (24, 24a) of the housing (1) are welded gas-tight to the housing jacket. Compact plate heat exchanger according to one of claims 1 to 4, characterized in that the end parts (24, 24a) of the housing (1) are detachably gas-tight and are fixed in a pressure-stable manner on the housing jacket. Compact plate heat exchanger according to claim 6, characterized in that the detachable connection between the housing shell and the end parts (24, 24a) is a screw connection via stud bolts.

Images