US20210131738A1 - Plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger - Google Patents
Plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger Download PDFInfo
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- US20210131738A1 US20210131738A1 US17/084,807 US202017084807A US2021131738A1 US 20210131738 A1 US20210131738 A1 US 20210131738A1 US 202017084807 A US202017084807 A US 202017084807A US 2021131738 A1 US2021131738 A1 US 2021131738A1
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- channel blocking
- heat exchanger
- shell
- plates
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 120
- 239000012530 fluid Substances 0.000 claims abstract description 75
- 238000007789 sealing Methods 0.000 claims description 40
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000001627 detrimental effect Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000005219 brazing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
- F28D9/0068—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements with means for changing flow direction of one heat exchange medium, e.g. using deflecting zones
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0006—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the plate-like or laminated conduits being enclosed within a pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0012—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the apparatus having an annular form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
- F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/005—Other auxiliary members within casings, e.g. internal filling means or sealing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
Definitions
- the present invention relates to a plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger.
- Plate-and-shell heat exchangers comprise a plurality of stacked structured plates positioned within a shell or casing.
- the plates are connected in pairs such that a first fluid flow path for a first fluid is provided at least partially within the connected pairs of plates.
- the pairs of connected plates are designed to fluidly connect a first inlet opening to a first outlet opening of the heat exchanger, thereby forming the first fluid flow path.
- a second fluid flow path for a second fluid is provided outside of the connected pairs of plates and separated from the first fluid flow path by the plates.
- the second fluid flow path fluidly connects a second inlet opening to a second outlet opening.
- the second fluid enters the shell of the heat exchanger through the second inlet opening and it flows along the complex second fluid flow path inside the shell and out through the second outlet opening.
- a part of the second fluid bypasses central regions of the heat transfer plates and flows from the second inlet opening to the second outlet opening along radially exterior peripheral regions of the heat transfer plates. This is due to the flow resistance being lower at the peripheral regions than at the central regions of the heat transfer plates. This bypassing of the central regions of the heat transfer plates results in a detrimental distribution of the second fluid and therefore in a problematic suboptimal heat transfer rate.
- a plate-and-shell heat exchanger which comprises a shell and a plurality of heat transfer plates within the shell.
- the shell and the plates may be of any shape, but a cylindrical or circular shape of the shell and the plates is preferred.
- the plates form fluidly connected first cavities for providing a first fluid flow path for a first fluid flow.
- the shell forms a second cavity in which the plates are arranged and a second fluid flow path is provided for a second fluid flow separated from the first fluid flow path by the plates.
- Two adjacent plates are connected to form an enclosed volume such that a first cavity is provided between them.
- At least one channel blocking plate is provided between at least some of the plates and the shell, said channel blocking plate comprising a plurality of protrusions extending in a direction radially inwards of the shell and reaching between two adjacent plates.
- the protrusions reach into the second fluid flow path and pose as an obstacle or barrier to the second fluid flow in a radially exterior peripheral region of the heat transfer plates.
- the second fluid flow is thus directed away from the radially exterior peripheral region and towards the central region of the heat transfer plates.
- the present invention therefore solves the bypass problem and helps increasing the heat transfer rate of the heat exchanger.
- the channel blocking plate extends over 60° ⁇ 30°, in particular ⁇ 15°, in a circumferential direction of the shell. In another embodiment, the channel blocking plate may extend over 60° ⁇ 5° in a circumferential direction of the shell. As the channel blocking plate extends not all way around the heat transfer plates, it allows for sufficient distribution of the second flow between the heat transfer plates while at the same time limiting or blocking any undesired bypass flows.
- the channel blocking plate may extend along the entire inner length of the shell in an axial direction of the shell and/or the channel blocking plate may comprise a plurality of separated, preferably identical, sub-plates.
- the channel blocking plate may be curved such that it aligns with the curvature of the shell and the curvature of the outside edges of the heat transfer plates.
- the channel blocking plate may be press-fit, welded or otherwise connected to the heat transfer plates. Alternatively, a loose fit may be provided between the channel blocking plate and the heat transfer plates for ease of manufacture and assembly.
- At least two channel blocking plates are provided which are positioned opposite each other with respect to a central axis of the shell.
- the two channel blocking plates may thus be spaced apart by 180° around the longitudinal axis of the shell.
- the protrusions are formed by bent cuts.
- the channel blocking plate may be made of a sheet metal into which a plurality of cuts has been introduced. The cut areas may then be bent by about 90° to create the protrusion. For fitting the channel blocking plate between the shell and the heat transfer plates it may be bent as a whole, such that its curvature matches the curvature of the shell and the heat transfer plates.
- a sealing plate is positioned radially outwards of the channel blocking plate for sealing openings in the channel blocking plate, wherein the sealing plate is preferably held tight against the channel blocking plate by means of a spring mechanism.
- the sealing plate may be made from a sheet metal or from a synthetic material.
- the spring mechanism may be an elastic and/or synthetic component which is positioned between the shell and the sealing plate.
- the spring mechanism may be formed integrally with the sealing plate.
- the sealing plate may be made from a bent sheet metal. The sealing plate and/or the spring mechanism may be compressed upon insertion between the shell and the channel blocking plate, thus providing a force acting on the channel blocking plate and sealing the openings in the channel blocking plate.
- the protrusions on the at least one channel blocking plate are arranged shifted to each other and/or are arranged in parallel lines and/or the shapes of the protrusions match the shapes of the spaces between two adjacent plates.
- the shifted arrangement of the protrusions ensures that the distances between adjacent protrusions are sufficiently large to provide structural support during e.g. the manufacture of the channel blocking plate.
- the arrangement of the protrusions in parallel lines which are parallel to the longitudinal axis of the shell facilitates the bending of the channel blocking plate for adapting its shape to the curvature of the shell and of the heat transfer plates.
- Two adjacent protrusions which are spaced apart from each other in an axial direction of the shell may be spaced apart such that four radially most outward portions of four heat transfer plates are positioned between them.
- the shape of the cuts can be chosen so as to create a close fit between the protrusions and the heat transfer plates. By doing so, the gap between the protrusions and the heat transfer plates can be minimized, thereby minimizing the undesired bypass fluid flow.
- At least two channel blocking plates are provided which are spaced apart from each other in an axial direction of the shell, and which preferably are at least partially separated and/or surrounded by radially extending support structures and/or axially extending support structures.
- the protrusions comprise a rectangular portion and a tapered portion, wherein the tapered portion is positioned radially more inwards of the rectangular portion.
- the rectangular portion of the protrusion is designed to fit closely to the radially most outward portions of the heat transfer plates. These radially most outward portions of the heat transfer plates may be aligned in parallel to each other and perpendicular to the longitudinal axis of the shell.
- the tapered portions of the protrusions are designed to fit closely to a radially more inward portion of the heat transfer plates.
- the radially more inward portion of the heat transfer plates may be at an angle to the radially most outward portion of the heat transfer plate, thereby necessitating an accordingly tapered shape of the protrusion.
- the tapered portion is a triangular, arched or circular portion.
- the present invention also relates to a channel blocking plate for a plate-and-shell heat exchanger according to any of claims 1 to 9 .
- the channel blocking plate may feature any or all of the characteristics described above with respect to the heat exchanger and the corresponding channel blocking plate.
- 1 a an exploded view of a plate-and-shell heat exchanger
- 1 b a sectional schematic view of a plate-and-shell heat exchanger
- 3 a a schematic view of a first fluid flow path through the heat exchanger
- 3 b a schematic view of a second fluid flow path through the heat exchanger
- 5 b a sectional view showing the positioning of the channel blocking plates within the heat exchanger.
- FIG. 1 a shows an exploded view of a plate-and-shell heat exchanger 100 .
- the heat exchanger 100 comprises a shell 20 and a plurality of sealed pairs of heat transfer plates 10 within the shell 20 .
- the shell 20 may be of a hollow cylindrical shape and the plates 10 may be of a corresponding shape and size such that they can be fit into the shell 20 .
- Other shapes of the shell 20 and plates 10 are also possible, however shapes are preferred, which allow for close positioning of the plates 10 to the shell 20 .
- the plates 10 form fluidly connected first cavities 11 for providing a first fluid flow path 12 for a first fluid flow indicated by the corresponding arrows.
- the first fluid flow enters and leaves the heat exchanger through first inlet and outlet openings 23 , 23 ′.
- the first cavities 11 are surrounded by two adjacent plates 10 , which are connected to each other, as is shown more clearly in FIG. 1 b and as will be described below in more detail.
- FIG. 1 b shows the heat exchanger 100 in a sectional view and in an assembled state.
- the plates 10 are connected e.g. by welding or brazing at their rims in pairs, two and two, forming first cavities 11 for a sealed first fluid flow path 12 from a first inlet opening 23 to a first outlet opening 23 ′.
- a plurality of such stacks are stacked and e.g. welded or brazed around the first inlet and outlet openings 23 , 23 ′.
- the connected first inlet and outlet openings 23 , 23 ′ form hollow volumes such as e.g. hollow cylinders reaching through the stack to distribute and circulate a first fluid through the sealed first fluid flow path 12 .
- the second fluid flow path 22 formed outside of the sealed pairs of plates 10 and inside of the shell 20 is connected to second inlet and outlet openings 24 , 24 ′.
- a second fluid flow enters and leaves the heat exchanger 100 through second inlet and outlet openings 24 , 24 ′.
- the shell 20 forms a second cavity 21 in which the plates 10 are arranged and in which a second fluid flow path 22 for a second fluid flow is provided.
- the second fluid flow enters and leaves the heat exchanger 100 through second inlet and outlet openings 24 , 24 ′.
- the second fluid flow path 22 is separated from the first fluid flow path 12 by the plates 10 .
- the heat exchange occurs between the two fluids flowing separated from each other by the plates 10 .
- FIG. 2 a shows a detailed view of a heat transfer plate 10 of the presents invention's plate-and-shell heat exchanger 100 .
- the plate 10 may comprise a circular sheet metal and may comprise bent or otherwise non-planar portions.
- the plate 10 may separate the first fluid flow path 12 on one side of the plate 10 from the second fluid flow path 22 on the other side of the plate 10 .
- the plate 10 may comprise patterned heat transfer sections on one or on both sides of its generally planar and/or circular sides.
- the patterned heat transfer sections may be patterned for increasing the contact surface between the plate 10 and the fluids flowing past the plate 10 , thereby increasing the heat transfer through the plates 10 and between the fluids.
- the patterned heat transfer sections may include a mesh and/or stamped or die-cut portions.
- the plates 10 may comprise plate openings 13 for connecting fluidly adjacent plates 10 to each other and to the first inlet and outlet opening 23 , 23 ′.
- Two adjacent plates 10 may be connected and sealed together by e.g. a welding or brazing along the edge of the plate opening 13 and/or along the outer perimeter of the two plates 10 .
- FIG. 2 b shows a detailed sectional view of a plurality of connected heat transfer plates 10 .
- Two adjacent plates 10 may be connected to each other at their outer circumferences, in particular at annular connection portions 14 of their outer edges.
- sealed pairs of connected plates 10 are provided for allowing the first fluid to flow through the first fluid flow path 12 bounded by the connected pairs of plates 10 .
- the second fluid flow path 22 is guided between two adjacent pairs of connected plates 10 and separated from the first fluid flow path 12 by the plates 10 . It comprises flat, narrow channels between closely positioned plates 10 .
- the second fluid flow rate in the vertical direction and between the pairs of connected plates 10 as shown in FIG. 2 b is essential. This flow component corresponds in approximation to a radial or tangential component of the second fluid flow with respect to the shell 20 .
- annular bypass cavities 15 are formed, which allow a non-radial component of the second fluid flow in a circumferential direction with respect to the shell 20 .
- This circumferential component of the second fluid flow does not pass between the radially inward space between two pairs of connected plates 10 but only between the radially outward part of two pairs of connected plates 10 .
- the heat transfer rate between the two fluid flows is significantly lower in the bypass cavity 15 .
- FIGS. 3 a and 3 b are schematic views of parts of the first and second fluid flow paths 12 , 22 through the heat exchanger 100 .
- FIG. 3 a is a cross section perpendicular to the longitudinal axis of the shell 20 and through one pair of connected plates 10 .
- the arrows indicate the first fluid flow path 12 inside one such pair of connected plates 10 .
- the pair of connected plates 10 defines and surrounds a first cavity 11 .
- the fluid flow path 12 enters the pair of connected plates 10 through one of the two plate openings 13 and leaves the pair of connected plates 10 through the other of the two plate openings 13 .
- the first fluid fills the entire first cavity 11 such that heat transfer can occur over the entire or almost entire surface of the pair of connected plates 10 .
- the heat transfer between the first fluid in the first cavity 11 and the second fluid outside the first cavity 11 is hence facilitated.
- the edges of the two connected plates 10 are welded or brazed or otherwise connected and there is no problem with a bypass.
- FIG. 3 b shows a part of the second fluid flow path 22 in a cross section of the heat exchanger 100 . This time, not the inside of a pair of connected plates 10 is shown, but the space between two such connected pairs of plates 10 .
- the cross section of FIG. 3 b is therefore off-set with respect to the cross-section of FIG. 3 a in an axial or longitudinal direction of the shell 20 .
- the two openings 13 shown in FIG. 3 b connect two neighbouring pairs of connected plates 10 and are part of the first fluid flow path 12 passing there through.
- the second fluid flow path 22 fills the second cavity 21 .
- the second cavity 21 is bounded by the inside of the shell 20 , the outsides of the pairs of connected plates 10 , one of which is shown in FIG. 3 b and possibly further structures contained within the shell 20 .
- the second flow path 22 enters the shell 20 through the second inlet and outlet openings 24 , 24 ′, which may be positioned on opposite sides of the shell surface.
- a part of the second flow passes in a mostly radial direction between the two second openings 24 , 24 ′.
- the bypass cavity 15 is present at the outer circumference of the second cavity 21
- another part of the second flow passes in a mostly circumferential direction between the two second openings 24 , 24 ′ and without entering the narrow space between two adjacent pairs of connected plates 10 . Therefore, at the edges of the plates 10 , where the connected pairs of plates 10 are connected and/or welded and/or brazed, the undesired bypass for the second fluid flow is formed, which reduces the overall efficiency of the heat exchanger 100 .
- FIG. 4 a shows part of the present invention's solution for overcoming this problem of reduced heat exchanger efficiency.
- a channel blocking plate 30 in a partially manufactured state is shown.
- the channel blocking plate 30 is provided in the area of the bypass cavity 15 shown in FIG. 3 b , effectively stopping bypass currents of the second flow.
- the channel blocking plate 30 is provided between at least some of the plates 10 and the shell 20 . In a preferred embodiment, the channel blocking plate 30 may be provided between all of the plates 10 and the shell 20 .
- the channel blocking plate 30 comprises a plurality of protrusions 31 , extending in a direction radially inwards of the shell 20 .
- the channel blocking plate 30 of FIG. 4 a shows only twelve such protrusions, the channel blocking plate 30 may comprise any required number of protrusions for a given heat exchanger 100 size and geometry.
- the protrusions 31 may be formed by bent cuts in a sheet metal. Alternative or additional manufacturing methods may also be employed for generating the channel blocking plate 30 .
- the bent areas portions of the protrusions 31 may be designed to point in the direction or in the opposite direction of the second fluid flow.
- the protrusions 31 may be cut and bent such that some of the protrusions 31 are bent one way, and the other protrusions 31 are bent in the opposite way.
- the protrusions 31 may be arranged shifted to each other and/or may be arranged in parallel lines on the channel blocking plate 30 as shown in FIGS. 4 a to 4 c .
- bent portions of at least some of the protrusions 31 may be collinear.
- FIG. 4 b shows the protrusions extending over almost the entire width of the channel blocking plate 30 .
- the example of FIG. 4 b shows rows of seven protrusions 31 extending across the width of the channel blocking plate 30 .
- Two neighbouring rows of protrusions 31 are off-set in the directions of the width of the plate 30 by about half the distance between two neighbouring protrusions 31 .
- the shapes of the protrusions 31 may be designed to match the shapes of the spaces between two adjacent plates 10 .
- the protrusions 31 may comprise a rectangular portion 311 and a tapered portion 312 .
- the tapered portion 312 is positioned radially more inwards of the rectangular portion 311 .
- the protrusion 31 reaches into the bypass cavity 15 between two plates 10 and aligns with the plates 10 to at least partially seal of the bypass cavity 15 .
- the tapered portion 312 may comprise triangular, arched and/or circular sub-portions, such that the whole protrusions align as closely as possible to the plates 10 adjacent to it.
- FIG. 4 c shows a semi-assembled heat exchanger 100 , wherein a multitude of heat transfer plates 10 are aligned along a vertical axis and a part of said plates 10 is partially covered by two channel blocking plates 30 positioned radially outward of the heat transfer plates 10 .
- the channel blocking plates 30 and their protrusions 31 are formed such that the protrusions 31 reach between two adjacent plates 10 and into the bypass cavity 15 defined by said two adjacent plates 10 .
- the channel blocking plate 30 is designed to increase the portion of the second flow passing heat exchange regions of the heat exchanger 100 which exhibit the highest temperature gradient.
- FIG. 4 c shows two channel blocking plates 30 which are spaced apart from each other in an axial direction of the shell 20 , and which are separated or surrounded by radially extending support structures 40 and axially extending support structures 41 . Additional channel blocking plates 30 may be provided, such that all or almost all of the heat transfer plates 10 of the heat exchanger 100 may be in contact with at least one channel blocking plate 30 . For example, a third channel blocking plate 30 could be added above the two channel blocking plates 30 during further assembly of the heat exchanger 100 .
- the channel blocking plate 30 may extend over only a fraction of the circumference of the heat exchanger 100 , thereby blocking the bypass cavities 15 only in a limited, defined area. This allows for a flow of the second fluid through the bypass cavities 15 and through adjacent pairs of connected heat transfer plates 10 in other areas of the heat exchanger 100 .
- the channel blocking plates 30 may stretch over 60° ⁇ 30° or ⁇ 15° in a circumferential direction of the shell 20 .
- the areas beyond those covered by the channel blocking plates 30 can be left free for the second fluid flow to pass between the second inlet and outlet openings 24 , 24 ′ shown in FIGS. 1 a and 1 b and between the pairs of connected heat transfer plates 10 .
- the channel blocking plate 30 may extend along the entire inner length of the shell 20 in an axial direction of the shell 20 . This corresponds to the channel blocking plate 30 of FIG. 4 c extending along the entire vertical or height direction of the interior of the shell 20 .
- the channel blocking plate 30 may be made of a plurality of separated and preferably identical sub-plates. In the case of the embodiment shown in FIG. 4 c , three separate sub-plates, positioned next to each other in an axial direction of the shell 20 may form the channel blocking plate 30 .
- different numbers of channel blocking plates 30 may also be provided.
- the channel blocking plates 30 visible in FIG. 4 c are all positioned on one side of the heat exchanger 100 .
- at least one channel blocking plate 30 may be provided on a side of the heat exchanger 100 facing away from the channel blocking plates 30 visible in FIG. 4 c . If the second fluid flow path 22 shown in FIG. 3 b flows in a generally horizontal direction in FIG. 4 c , then the at least two channel blocking plates 30 can force the second fluid to flow past the inside and between the connected pairs of heat transfer plates 10 rather than close to the outer circumference of the inside of the shell 20 . The channel blocking plates 30 thus reduce or eliminate unwanted bypass currents around the areas of greatest heat exchange positioned radially inward of the shell 20 .
- FIG. 5 a shows a sectional view of the channel blocking plate 30 positioned between heat transfer plates 10 and the radially outward positioned shell 20 .
- the protrusions 31 are shown to block every other bypass cavity 15 at the circumferential position shown in FIG. 5 a . It is understood that the bypass cavities 15 not blocked off in FIG. 5 a are blocked off by other, not shown protrusions 31 at a different circumferential position of the channel blocking plate 30 .
- the protrusions 31 may be of a non-uniform cross-section and may be formed to fit snugly to the annular connection portions 14 of the connected pairs of heat transfer plates 10 .
- the protrusions shown in FIG. 5 a are all directed radially inwards of the heat exchanger 100 .
- at least some of the protrusions 31 may be directed radially outwards of the heat exchanger 100 such that they press against the inside of the shell 20 and hence provide a force pushing the channel blocking plate 30 radially inwards and into position against the heat transfer plates 10 .
- the protrusions 31 which are directed radially outwards may be not parallel to the protrusions 31 directed radially inwards but rather only slightly bent from the circumferential direction in which the entire channel blocking plate 30 is aligned.
- FIG. 5 b is a sectional view of parts of the heat exchanger 100 , showing the positioning of the channel blocking plates 30 within the heat exchanger 100 .
- two channel blocking plates 30 are positioned on opposite sides of the heat exchanger.
- the two channel blocking plates 30 may be offset to each other by 180° in the circumferential direction of the heat exchanger 100 .
- the channel blocking plates 30 may be at a position, which is offset by about 90° from the position of the plate openings 13 and/or the second inlet and outlet openings 24 , 24 ′ shown in FIGS. 1 a, 1 b and 3 b.
- the heat exchanger 100 may comprise one or more sealing plates 50 which may be positioned radially outwards of the channel blocking plate 30 for reducing or eliminating undesired fluid flow through or past the channel blocking plate 30 .
- the sealing plates 50 may be compressed between the inside of the shell 20 (not shown in FIG. 5 b ) and the outside of the channel blocking plates 30 .
- the sealing plate 50 seals openings in the channel blocking plate 30 resulting from the cut and bent protrusions 31 , as visible in FIG. 4 b .
- the sealing plate 50 may be held tight against the channel blocking plate 30 by means of a spring mechanism, such as a metallic spring portion and/or a synthetic elastic material.
- the sealing plate 50 may comprise a radially inwards sealing portion which fits snugly onto the radially outward side of the channel blocking plate 30 .
- One or more separation portions may be connected to the sealing portion, said separation portions extending in a radial direction and away from the sealing portion.
- One or more spring portions may be connected to the separation portions.
- the spring portion of the sealing plate may be the spring mechanism for pressing the sealing plate 50 against the channel blocking plate.
- the spring portions may be positioned at an angle with respect to the separation portion and may be designed to be deformed upon insertion into the shell 20 .
- the deformation of the spring portion results in a force pushing the sealing plate 50 on the channel blocking plate 30 , thereby sealing at least some of the leakage occurring past the channel blocking plate 30 .
- the sealing plate 50 may be smaller than the channel blocking plate 30 .
- the sealing plate 50 may be dimensioned such that the channel blocking plate 30 may be two, three or more times wider in a circumferential direction than a single sealing plate 50 . Smaller sealing plates 50 and a corresponding higher number of sealing plates and spring mechanisms make it possible to exert a more uniform cross on the channel blocking plate 30 , thereby improving the sealing function of the sealing plate 50 .
Abstract
Description
- This application claims foreign priority benefits under 35 U.S.C. § 119 to Danish Patent Application No. PA201901288 filed on Nov. 4, 2019, the content of which is hereby incorporated by reference in its entirety.
- The present invention relates to a plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger.
- Plate-and-shell heat exchangers comprise a plurality of stacked structured plates positioned within a shell or casing. The plates are connected in pairs such that a first fluid flow path for a first fluid is provided at least partially within the connected pairs of plates. The pairs of connected plates are designed to fluidly connect a first inlet opening to a first outlet opening of the heat exchanger, thereby forming the first fluid flow path. A second fluid flow path for a second fluid is provided outside of the connected pairs of plates and separated from the first fluid flow path by the plates. The second fluid flow path fluidly connects a second inlet opening to a second outlet opening.
- The second fluid enters the shell of the heat exchanger through the second inlet opening and it flows along the complex second fluid flow path inside the shell and out through the second outlet opening. A part of the second fluid bypasses central regions of the heat transfer plates and flows from the second inlet opening to the second outlet opening along radially exterior peripheral regions of the heat transfer plates. This is due to the flow resistance being lower at the peripheral regions than at the central regions of the heat transfer plates. This bypassing of the central regions of the heat transfer plates results in a detrimental distribution of the second fluid and therefore in a problematic suboptimal heat transfer rate.
- This problem is solved by the present invention's heat exchanger according to claim 1 and by a channel blocking plate for a heat exchanger according to
claim 10. Further embodiments of the invention are subject of the dependent claims. - According to the first claim, a plate-and-shell heat exchanger is provided, which comprises a shell and a plurality of heat transfer plates within the shell. The shell and the plates may be of any shape, but a cylindrical or circular shape of the shell and the plates is preferred. The plates form fluidly connected first cavities for providing a first fluid flow path for a first fluid flow. The shell forms a second cavity in which the plates are arranged and a second fluid flow path is provided for a second fluid flow separated from the first fluid flow path by the plates. Two adjacent plates are connected to form an enclosed volume such that a first cavity is provided between them.
- According to the invention, at least one channel blocking plate is provided between at least some of the plates and the shell, said channel blocking plate comprising a plurality of protrusions extending in a direction radially inwards of the shell and reaching between two adjacent plates.
- The protrusions reach into the second fluid flow path and pose as an obstacle or barrier to the second fluid flow in a radially exterior peripheral region of the heat transfer plates. The second fluid flow is thus directed away from the radially exterior peripheral region and towards the central region of the heat transfer plates. The present invention therefore solves the bypass problem and helps increasing the heat transfer rate of the heat exchanger.
- In a preferred embodiment the channel blocking plate extends over 60° ±30°, in particular ±15°, in a circumferential direction of the shell. In another embodiment, the channel blocking plate may extend over 60°±5° in a circumferential direction of the shell. As the channel blocking plate extends not all way around the heat transfer plates, it allows for sufficient distribution of the second flow between the heat transfer plates while at the same time limiting or blocking any undesired bypass flows.
- The channel blocking plate may extend along the entire inner length of the shell in an axial direction of the shell and/or the channel blocking plate may comprise a plurality of separated, preferably identical, sub-plates. The channel blocking plate may be curved such that it aligns with the curvature of the shell and the curvature of the outside edges of the heat transfer plates. The channel blocking plate may be press-fit, welded or otherwise connected to the heat transfer plates. Alternatively, a loose fit may be provided between the channel blocking plate and the heat transfer plates for ease of manufacture and assembly.
- In another preferred embodiment at least two channel blocking plates are provided which are positioned opposite each other with respect to a central axis of the shell. The two channel blocking plates may thus be spaced apart by 180° around the longitudinal axis of the shell. Such an arrangement of the channel blocking plates provides a simple way of blocking undesired bypass flows through the heat exchanger.
- In another preferred embodiment the protrusions are formed by bent cuts. The channel blocking plate may be made of a sheet metal into which a plurality of cuts has been introduced. The cut areas may then be bent by about 90° to create the protrusion. For fitting the channel blocking plate between the shell and the heat transfer plates it may be bent as a whole, such that its curvature matches the curvature of the shell and the heat transfer plates.
- In another preferred embodiment a sealing plate is positioned radially outwards of the channel blocking plate for sealing openings in the channel blocking plate, wherein the sealing plate is preferably held tight against the channel blocking plate by means of a spring mechanism. The sealing plate may be made from a sheet metal or from a synthetic material. The spring mechanism may be an elastic and/or synthetic component which is positioned between the shell and the sealing plate. The spring mechanism may be formed integrally with the sealing plate. In particular, the sealing plate may be made from a bent sheet metal. The sealing plate and/or the spring mechanism may be compressed upon insertion between the shell and the channel blocking plate, thus providing a force acting on the channel blocking plate and sealing the openings in the channel blocking plate.
- In another preferred embodiment the protrusions on the at least one channel blocking plate are arranged shifted to each other and/or are arranged in parallel lines and/or the shapes of the protrusions match the shapes of the spaces between two adjacent plates. The shifted arrangement of the protrusions ensures that the distances between adjacent protrusions are sufficiently large to provide structural support during e.g. the manufacture of the channel blocking plate.
- The arrangement of the protrusions in parallel lines which are parallel to the longitudinal axis of the shell facilitates the bending of the channel blocking plate for adapting its shape to the curvature of the shell and of the heat transfer plates.
- Two adjacent protrusions which are spaced apart from each other in an axial direction of the shell may be spaced apart such that four radially most outward portions of four heat transfer plates are positioned between them. When manufacturing the channel blocking plate, the shape of the cuts can be chosen so as to create a close fit between the protrusions and the heat transfer plates. By doing so, the gap between the protrusions and the heat transfer plates can be minimized, thereby minimizing the undesired bypass fluid flow.
- In another preferred embodiment at least two channel blocking plates are provided which are spaced apart from each other in an axial direction of the shell, and which preferably are at least partially separated and/or surrounded by radially extending support structures and/or axially extending support structures.
- In another preferred embodiment the protrusions comprise a rectangular portion and a tapered portion, wherein the tapered portion is positioned radially more inwards of the rectangular portion. The rectangular portion of the protrusion is designed to fit closely to the radially most outward portions of the heat transfer plates. These radially most outward portions of the heat transfer plates may be aligned in parallel to each other and perpendicular to the longitudinal axis of the shell. The tapered portions of the protrusions are designed to fit closely to a radially more inward portion of the heat transfer plates. The radially more inward portion of the heat transfer plates may be at an angle to the radially most outward portion of the heat transfer plate, thereby necessitating an accordingly tapered shape of the protrusion. In a particularly preferred embodiment, the tapered portion is a triangular, arched or circular portion.
- The present invention also relates to a channel blocking plate for a plate-and-shell heat exchanger according to any of claims 1 to 9. The channel blocking plate may feature any or all of the characteristics described above with respect to the heat exchanger and the corresponding channel blocking plate.
- Further details and advantages of the invention are described with reference to the following figures:
- 1 a: an exploded view of a plate-and-shell heat exchanger;
- 1 b: a sectional schematic view of a plate-and-shell heat exchanger;
- 2 a: a detailed view of a heat transfer plate of a plate-and-shell heat exchanger;
- 2 b: a detailed sectional view of a plurality of connected heat transfer plates;
- 3 a: a schematic view of a first fluid flow path through the heat exchanger;
- 3 b: a schematic view of a second fluid flow path through the heat exchanger;
- 4 a: a detailed view of a partially manufactured channel blocking plate of the heat exchanger;
- 4 b: another detailed view of a partially manufactured channel blocking plate;
- 4 c: a partially assembled heat exchanger with visible channel blocking plates;
- 5 a: a sectional view of a channel blocking plate positioned between heat transfer plates and a shell of the heat exchanger; and
- 5 b: a sectional view showing the positioning of the channel blocking plates within the heat exchanger.
-
FIG. 1a shows an exploded view of a plate-and-shell heat exchanger 100. Theheat exchanger 100 comprises ashell 20 and a plurality of sealed pairs ofheat transfer plates 10 within theshell 20. - The
shell 20 may be of a hollow cylindrical shape and theplates 10 may be of a corresponding shape and size such that they can be fit into theshell 20. Other shapes of theshell 20 andplates 10 are also possible, however shapes are preferred, which allow for close positioning of theplates 10 to theshell 20. - The
plates 10 form fluidly connectedfirst cavities 11 for providing a firstfluid flow path 12 for a first fluid flow indicated by the corresponding arrows. The first fluid flow enters and leaves the heat exchanger through first inlet and outlet openings 23, 23′. Thefirst cavities 11 are surrounded by twoadjacent plates 10, which are connected to each other, as is shown more clearly inFIG. 1b and as will be described below in more detail.FIG. 1b shows theheat exchanger 100 in a sectional view and in an assembled state. - The
plates 10 are connected e.g. by welding or brazing at their rims in pairs, two and two, formingfirst cavities 11 for a sealed firstfluid flow path 12 from a first inlet opening 23 to a first outlet opening 23′. A plurality of such stacks are stacked and e.g. welded or brazed around the first inlet and outlet openings 23, 23′. The connected first inlet and outlet openings 23, 23′ form hollow volumes such as e.g. hollow cylinders reaching through the stack to distribute and circulate a first fluid through the sealed firstfluid flow path 12. The secondfluid flow path 22 formed outside of the sealed pairs ofplates 10 and inside of theshell 20 is connected to second inlet andoutlet openings heat exchanger 100 through second inlet andoutlet openings - The
shell 20 forms asecond cavity 21 in which theplates 10 are arranged and in which a secondfluid flow path 22 for a second fluid flow is provided. The second fluid flow enters and leaves theheat exchanger 100 through second inlet andoutlet openings fluid flow path 22 is separated from the firstfluid flow path 12 by theplates 10. The heat exchange occurs between the two fluids flowing separated from each other by theplates 10. -
FIG. 2a shows a detailed view of aheat transfer plate 10 of the presents invention's plate-and-shell heat exchanger 100. Theplate 10 may comprise a circular sheet metal and may comprise bent or otherwise non-planar portions. Theplate 10 may separate the firstfluid flow path 12 on one side of theplate 10 from the secondfluid flow path 22 on the other side of theplate 10. Theplate 10 may comprise patterned heat transfer sections on one or on both sides of its generally planar and/or circular sides. The patterned heat transfer sections may be patterned for increasing the contact surface between theplate 10 and the fluids flowing past theplate 10, thereby increasing the heat transfer through theplates 10 and between the fluids. The patterned heat transfer sections may include a mesh and/or stamped or die-cut portions. - The
plates 10 may compriseplate openings 13 for connecting fluidlyadjacent plates 10 to each other and to the first inlet and outlet opening 23, 23′. Twoadjacent plates 10 may be connected and sealed together by e.g. a welding or brazing along the edge of theplate opening 13 and/or along the outer perimeter of the twoplates 10. -
FIG. 2b shows a detailed sectional view of a plurality of connectedheat transfer plates 10. Twoadjacent plates 10 may be connected to each other at their outer circumferences, in particular atannular connection portions 14 of their outer edges. Thus, sealed pairs ofconnected plates 10 are provided for allowing the first fluid to flow through the firstfluid flow path 12 bounded by the connected pairs ofplates 10. - The second
fluid flow path 22 is guided between two adjacent pairs ofconnected plates 10 and separated from the firstfluid flow path 12 by theplates 10. It comprises flat, narrow channels between closelypositioned plates 10. For efficient heat exchange, the second fluid flow rate in the vertical direction and between the pairs ofconnected plates 10 as shown inFIG. 2b is essential. This flow component corresponds in approximation to a radial or tangential component of the second fluid flow with respect to theshell 20. - As can be seen in
FIG. 2b , in the area of theannular portions 14 of theplates 10,annular bypass cavities 15 are formed, which allow a non-radial component of the second fluid flow in a circumferential direction with respect to theshell 20. This circumferential component of the second fluid flow does not pass between the radially inward space between two pairs ofconnected plates 10 but only between the radially outward part of two pairs ofconnected plates 10. Because of the geometry of thebypass cavities 15 and the radially outwardannular connection portions 14, the heat transfer rate between the two fluid flows is significantly lower in thebypass cavity 15. -
FIGS. 3a and 3b are schematic views of parts of the first and secondfluid flow paths heat exchanger 100.FIG. 3a is a cross section perpendicular to the longitudinal axis of theshell 20 and through one pair ofconnected plates 10. The arrows indicate the firstfluid flow path 12 inside one such pair ofconnected plates 10. The pair ofconnected plates 10 defines and surrounds afirst cavity 11. Thefluid flow path 12 enters the pair ofconnected plates 10 through one of the twoplate openings 13 and leaves the pair ofconnected plates 10 through the other of the twoplate openings 13. In between the twoopenings 13, the first fluid fills the entirefirst cavity 11 such that heat transfer can occur over the entire or almost entire surface of the pair ofconnected plates 10. The heat transfer between the first fluid in thefirst cavity 11 and the second fluid outside thefirst cavity 11 is hence facilitated. Inside the sealed pair ofplates 10, the edges of the twoconnected plates 10 are welded or brazed or otherwise connected and there is no problem with a bypass. -
FIG. 3b shows a part of the secondfluid flow path 22 in a cross section of theheat exchanger 100. This time, not the inside of a pair ofconnected plates 10 is shown, but the space between two such connected pairs ofplates 10. The cross section ofFIG. 3b is therefore off-set with respect to the cross-section ofFIG. 3a in an axial or longitudinal direction of theshell 20. The twoopenings 13 shown inFIG. 3b connect two neighbouring pairs ofconnected plates 10 and are part of the firstfluid flow path 12 passing there through. - The second
fluid flow path 22 fills thesecond cavity 21. Thesecond cavity 21 is bounded by the inside of theshell 20, the outsides of the pairs ofconnected plates 10, one of which is shown inFIG. 3b and possibly further structures contained within theshell 20. Thesecond flow path 22 enters theshell 20 through the second inlet andoutlet openings - A part of the second flow passes in a mostly radial direction between the two
second openings bypass cavity 15 is present at the outer circumference of thesecond cavity 21, another part of the second flow passes in a mostly circumferential direction between the twosecond openings connected plates 10. Therefore, at the edges of theplates 10, where the connected pairs ofplates 10 are connected and/or welded and/or brazed, the undesired bypass for the second fluid flow is formed, which reduces the overall efficiency of theheat exchanger 100. -
FIG. 4a shows part of the present invention's solution for overcoming this problem of reduced heat exchanger efficiency. Achannel blocking plate 30 in a partially manufactured state is shown. Thechannel blocking plate 30 is provided in the area of thebypass cavity 15 shown inFIG. 3b , effectively stopping bypass currents of the second flow. Thechannel blocking plate 30 is provided between at least some of theplates 10 and theshell 20. In a preferred embodiment, thechannel blocking plate 30 may be provided between all of theplates 10 and theshell 20. - The
channel blocking plate 30 comprises a plurality ofprotrusions 31, extending in a direction radially inwards of theshell 20. Although thechannel blocking plate 30 ofFIG. 4a shows only twelve such protrusions, thechannel blocking plate 30 may comprise any required number of protrusions for a givenheat exchanger 100 size and geometry. - As can be seen in
FIGS. 4a and 4b , theprotrusions 31 may be formed by bent cuts in a sheet metal. Alternative or additional manufacturing methods may also be employed for generating thechannel blocking plate 30. The bent areas portions of theprotrusions 31 may be designed to point in the direction or in the opposite direction of the second fluid flow. Theprotrusions 31 may be cut and bent such that some of theprotrusions 31 are bent one way, and theother protrusions 31 are bent in the opposite way. - The
protrusions 31 may be arranged shifted to each other and/or may be arranged in parallel lines on thechannel blocking plate 30 as shown inFIGS. 4a to 4c . In particular, bent portions of at least some of theprotrusions 31 may be collinear. -
FIG. 4b shows the protrusions extending over almost the entire width of thechannel blocking plate 30. The example ofFIG. 4b shows rows of sevenprotrusions 31 extending across the width of thechannel blocking plate 30. Two neighbouring rows ofprotrusions 31 are off-set in the directions of the width of theplate 30 by about half the distance between two neighbouringprotrusions 31. - The shapes of the
protrusions 31 may be designed to match the shapes of the spaces between twoadjacent plates 10. Theprotrusions 31 may comprise arectangular portion 311 and atapered portion 312. In a state shown inFIG. 4c , in which thechannel blocking plate 30 is installed in theheat exchanger 100, the taperedportion 312 is positioned radially more inwards of therectangular portion 311. Theprotrusion 31 reaches into thebypass cavity 15 between twoplates 10 and aligns with theplates 10 to at least partially seal of thebypass cavity 15. - The tapered
portion 312 may comprise triangular, arched and/or circular sub-portions, such that the whole protrusions align as closely as possible to theplates 10 adjacent to it. -
FIG. 4c shows asemi-assembled heat exchanger 100, wherein a multitude ofheat transfer plates 10 are aligned along a vertical axis and a part of saidplates 10 is partially covered by twochannel blocking plates 30 positioned radially outward of theheat transfer plates 10. According toFIG. 4c , thechannel blocking plates 30 and theirprotrusions 31 are formed such that theprotrusions 31 reach between twoadjacent plates 10 and into thebypass cavity 15 defined by said twoadjacent plates 10. Thechannel blocking plate 30 is designed to increase the portion of the second flow passing heat exchange regions of theheat exchanger 100 which exhibit the highest temperature gradient. - The embodiment of
FIG. 4c shows twochannel blocking plates 30 which are spaced apart from each other in an axial direction of theshell 20, and which are separated or surrounded by radially extending support structures 40 and axially extendingsupport structures 41. Additionalchannel blocking plates 30 may be provided, such that all or almost all of theheat transfer plates 10 of theheat exchanger 100 may be in contact with at least onechannel blocking plate 30. For example, a thirdchannel blocking plate 30 could be added above the twochannel blocking plates 30 during further assembly of theheat exchanger 100. - As is also shown in
FIG. 4c , thechannel blocking plate 30 may extend over only a fraction of the circumference of theheat exchanger 100, thereby blocking thebypass cavities 15 only in a limited, defined area. This allows for a flow of the second fluid through thebypass cavities 15 and through adjacent pairs of connectedheat transfer plates 10 in other areas of theheat exchanger 100. - The
channel blocking plates 30 may stretch over 60° ±30° or ±15° in a circumferential direction of theshell 20. The areas beyond those covered by thechannel blocking plates 30 can be left free for the second fluid flow to pass between the second inlet andoutlet openings FIGS. 1a and 1b and between the pairs of connectedheat transfer plates 10. - The
channel blocking plate 30 may extend along the entire inner length of theshell 20 in an axial direction of theshell 20. This corresponds to thechannel blocking plate 30 ofFIG. 4c extending along the entire vertical or height direction of the interior of theshell 20. Thechannel blocking plate 30 may be made of a plurality of separated and preferably identical sub-plates. In the case of the embodiment shown inFIG. 4c , three separate sub-plates, positioned next to each other in an axial direction of theshell 20 may form thechannel blocking plate 30. Depending on the size and other geometrical features of theheat exchanger 100, different numbers ofchannel blocking plates 30 may also be provided. - The
channel blocking plates 30 visible inFIG. 4c are all positioned on one side of theheat exchanger 100. In order to block unwanted bypass currents in a circumferential direction of theheat exchanger 100, at least onechannel blocking plate 30 may be provided on a side of theheat exchanger 100 facing away from thechannel blocking plates 30 visible inFIG. 4c . If the secondfluid flow path 22 shown inFIG. 3b flows in a generally horizontal direction inFIG. 4c , then the at least twochannel blocking plates 30 can force the second fluid to flow past the inside and between the connected pairs ofheat transfer plates 10 rather than close to the outer circumference of the inside of theshell 20. Thechannel blocking plates 30 thus reduce or eliminate unwanted bypass currents around the areas of greatest heat exchange positioned radially inward of theshell 20. -
FIG. 5a shows a sectional view of thechannel blocking plate 30 positioned betweenheat transfer plates 10 and the radially outward positionedshell 20. Theprotrusions 31 are shown to block everyother bypass cavity 15 at the circumferential position shown inFIG. 5a . It is understood that thebypass cavities 15 not blocked off inFIG. 5a are blocked off by other, not shownprotrusions 31 at a different circumferential position of thechannel blocking plate 30. Theprotrusions 31 may be of a non-uniform cross-section and may be formed to fit snugly to theannular connection portions 14 of the connected pairs ofheat transfer plates 10. - The protrusions shown in
FIG. 5a are all directed radially inwards of theheat exchanger 100. In a different embodiment, which is not shown in the figures, at least some of theprotrusions 31 may be directed radially outwards of theheat exchanger 100 such that they press against the inside of theshell 20 and hence provide a force pushing thechannel blocking plate 30 radially inwards and into position against theheat transfer plates 10. Theprotrusions 31 which are directed radially outwards may be not parallel to theprotrusions 31 directed radially inwards but rather only slightly bent from the circumferential direction in which the entirechannel blocking plate 30 is aligned. -
FIG. 5b is a sectional view of parts of theheat exchanger 100, showing the positioning of thechannel blocking plates 30 within theheat exchanger 100. In this embodiment, twochannel blocking plates 30 are positioned on opposite sides of the heat exchanger. In particular, the twochannel blocking plates 30 may be offset to each other by 180° in the circumferential direction of theheat exchanger 100. Thechannel blocking plates 30 may be at a position, which is offset by about 90° from the position of theplate openings 13 and/or the second inlet andoutlet openings FIGS. 1 a, 1 b and 3 b. - The
heat exchanger 100 may comprise one ormore sealing plates 50 which may be positioned radially outwards of thechannel blocking plate 30 for reducing or eliminating undesired fluid flow through or past thechannel blocking plate 30. The sealingplates 50 may be compressed between the inside of the shell 20 (not shown inFIG. 5b ) and the outside of thechannel blocking plates 30. The sealingplate 50 seals openings in thechannel blocking plate 30 resulting from the cut andbent protrusions 31, as visible inFIG. 4b . The sealingplate 50 may be held tight against thechannel blocking plate 30 by means of a spring mechanism, such as a metallic spring portion and/or a synthetic elastic material. - The sealing
plate 50 may comprise a radially inwards sealing portion which fits snugly onto the radially outward side of thechannel blocking plate 30. One or more separation portions may be connected to the sealing portion, said separation portions extending in a radial direction and away from the sealing portion. One or more spring portions may be connected to the separation portions. The spring portion of the sealing plate may be the spring mechanism for pressing the sealingplate 50 against the channel blocking plate. - The spring portions may be positioned at an angle with respect to the separation portion and may be designed to be deformed upon insertion into the
shell 20. The deformation of the spring portion results in a force pushing the sealingplate 50 on thechannel blocking plate 30, thereby sealing at least some of the leakage occurring past thechannel blocking plate 30. - The sealing
plate 50 may be smaller than thechannel blocking plate 30. In particular, the sealingplate 50 may be dimensioned such that thechannel blocking plate 30 may be two, three or more times wider in a circumferential direction than asingle sealing plate 50.Smaller sealing plates 50 and a corresponding higher number of sealing plates and spring mechanisms make it possible to exert a more uniform cross on thechannel blocking plate 30, thereby improving the sealing function of the sealingplate 50. - The invention is not limited to the above-mentioned embodiments but may be varied in manifold ways. In particular, features of the above-mentioned embodiments may be combined in any logically possible manner. All features and advantages including construction details and spatial configurations, which are disclosed in the claims, in the description and in the figures, may be essential to the invention, both, individually and in combination with each other.
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DKPA201901288A DK180416B1 (en) | 2019-11-04 | 2019-11-04 | Plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger |
DKPA201901288 | 2019-11-04 |
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US20210131738A1 true US20210131738A1 (en) | 2021-05-06 |
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US17/084,807 Pending US20210131738A1 (en) | 2019-11-04 | 2020-10-30 | Plate-and-shell heat exchanger and a channel blocking plate for a plate-and-shell heat exchanger |
Country Status (5)
Country | Link |
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US (1) | US20210131738A1 (en) |
EP (1) | EP3816558A1 (en) |
CN (1) | CN112781415B (en) |
DK (1) | DK180416B1 (en) |
RU (1) | RU2741169C1 (en) |
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Also Published As
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RU2741169C1 (en) | 2021-01-22 |
CN112781415A (en) | 2021-05-11 |
EP3816558A1 (en) | 2021-05-05 |
DK201901288A1 (en) | 2021-04-22 |
DK180416B1 (en) | 2021-04-22 |
CN112781415B (en) | 2023-03-14 |
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