EP3423773A1 - Recuperator, parts of which are manufactured by injection moulding - Google Patents
Recuperator, parts of which are manufactured by injection mouldingInfo
- Publication number
- EP3423773A1 EP3423773A1 EP17716064.5A EP17716064A EP3423773A1 EP 3423773 A1 EP3423773 A1 EP 3423773A1 EP 17716064 A EP17716064 A EP 17716064A EP 3423773 A1 EP3423773 A1 EP 3423773A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plates
- recuperator
- channels
- side walls
- profiles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
-
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- 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
- F28D9/0025—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 being formed by zig-zag bend plates
-
- 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
- F28D9/0037—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 conduits for the other heat-exchange medium also being formed by paired plates touching each other
-
- 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
-
- 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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
- F28F21/066—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits for domestic or space-heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F2255/14—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded
- F28F2255/143—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes molded injection molded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
Definitions
- the invention relates to recuperators, i.e. heat exchangers which are configured to transfer thermal energy between two fluids which are guided through two series of channels thermally coupled to each other, wherein the two media remain separated.
- recuperators i.e. heat exchangers which are configured to transfer thermal energy between two fluids which are guided through two series of channels thermally coupled to each other, wherein the two media remain separated.
- the invention relates more particularly to a recuperator comprising a number of plates stacked onto each other and extending mutually parallel, wherein at least some of the number of plates are provided over at least a part of their surface with profiles which form channels extending between the plates and wherein the channels present on either side of a plate extend parallel, wherein each of the plates lies adjacent on one of its sides to channels of the first type and lies adjacent on its other side to channels of the second type, and wherein adjoining plates stacked onto each other are mutually connected at their edges extending parallel to the channels.
- recuperators are known, for instance from EP-A-0 666 973.
- This document describes a recuperator comprising a number of plates stacked onto each other and extending with their main direction parallel to each other, wherein at least some of the number of plates are provided over at least a substantial part of their surface with profiles comprising side walls which extend mutually parallel and with a component transversely of the main direction of the plates, and channels extending mutually parallel are present between the side walls, wherein each of the side walls lies adjacent on one of its sides to channels of the first type and lies adjacent on its other side to channels of the second type, and wherein adjoining plates stacked onto each other are mutually connected at their edges extending parallel to the channels.
- thermoforming produces a satisfactory product, it has limitations in respect of material and shape of the channels. Further research has shown that there is a need for a greater freedom in the choice of the shape of the channels and materials, for instance in respect of resistance to aggressive substances and temperatures.
- the thermoforming further requires a relatively large number of operations, such as extruding of the foil, handling of the rolls of foil, removal of the formed plates from the thermoforming machine, stacking of the plates and forming of a connection between the plates using adhesive, chemically by means of immersion in a mild solvent, or ultrasonic welding.
- These prior art recuperators also comprise a number of walls which are fastened against the sides of the stack of plates by means of hot melt, since the sides of the plate must be sealed off from the surrounding area.
- the object of the invention is to provide a recuperator which obviates the above stated drawbacks. This object is achieved with a recuperator of the above stated type, wherein the plates which are provided with profiles are manufactured by injection moulding.
- EP-A-2 614 764 describes a recuperator which is assembled from stacked plates, each manufactured by injection moulding. Channels of the same type are however present here on either side of the side walls, since channels of different types are always separated by the plates themselves. No heat transport takes place through the side walls here.
- the side walls of the profiles extend substantially transversely of the main plane. This makes the height of these walls as small as possible, which facilitates the injection moulding.
- Recuperators can be manufactured with different geometries. There are geometries wherein only plates provided with a profile are applied, but there are also geometries wherein plates provided with a profile are alternated with flat plates.
- the plates which are provided with a profile and manufactured by injection moulding can be combined with other plates which are provided with a profile and formed by thermoforming, or with flat plates which may or may not be formed by injection moulding.
- the invention further relates to a method for manufacturing a recuperator, which recuperator is provided with a number of plates extending mutually parallel, at least some of which are provided over at least a part of their surface with profiles, wherein the profiles are provided with side walls extending with a component transversely of the main direction of the plates and wherein channels extending mutually parallel are present between the side walls, wherein each of the side walls lies adjacent on one of its sides to channels of the first type and lies adjacent on its other side to channels of the second type, wherein adjoining plates stacked onto each other are mutually connected at their edges extending parallel to the channels, and wherein at least some of the plates are manufactured by injection moulding and the thus manufactured plates and plates which may have been manufactured in another way are stacked.
- the plates which are provided with a profile have a thickness smaller than 500 ⁇ .
- These smaller thicknesses are made possible by modern injection moulding techniques, such as injecting from the centre of the plate, the use of a series of hot runners, application of a higher pressure such as >1500 bar or > 2000 bar and/or the use of materials with a melt flow index > 120.
- the plates which are provided with a profile are manufactured from polypropylene.
- Polypropylene is a material which can be supplied with a melt flow index greater than 120, while being a material which can readily withstand the aggressiveness of diverse fluids.
- the latent heat This requires condensation and evaporation alternating over time in a single channel and condensation and evaporation taking place simultaneously in different channels.
- the surface of the plates provided with a profile it is preferred for the surface of the plates provided with a profile to have a capillary or hydrophilic structure. This is because the water spreads owing to the hydrophilic structure, so that it can evaporate more effectively. Since the geometry wherein only plates provided with a profile are applied halves the use of material, it is preferred for all plates to be provided with a profile.
- the profiled plates and manufactured by injection moulding with at least one distribution strip extending transversely of the longitudinal direction of the profiles, parallel to the main direction of the plate. In combination with the placing of one or more injection points in these strips a better distribution of the plastic is obtained, which can greatly reduce the cycle time.
- the profiled plates are provided with one elongate distribution strip extending transversely of the longitudinal direction of the plate, substantially in the centre of the profiles and parallel to the main plane of the plate.
- the injection point or injection points is or are then placed in this distribution strip.
- the recuperator has to be provided with side walls extending parallel to the channels and transversely of the main plane of the plates, since the outermost channels have to be closed off from the surrounding area. It is therefore attractive for the profiled plates to comprise side wall pieces extending parallel to the longitudinal direction of the profiles and forming a connection to side wall pieces of adjacent plates.
- the side wall pieces of the plates which are provided with profiles and which are stacked onto each other here together form the side walls of the recuperator.
- the side wall pieces on each of the sides can extend to only one side.
- the width of the side wall pieces corresponds to the distance between the plates. It is however likewise possible for the side wall pieces to extend to both sides.
- the width of the side wall pieces amounts here to a part of the overall width, but the sum of the widths of both side wall pieces on one side is equal to the distance between the plates.
- the side wall pieces preferably form a form-locking connection to the side wall pieces of adjoining plates. This is otherwise also understood to mean the situation in which, in the absence of side wall pieces in an adjoining plate, the side wall pieces are connected directly to the adjoining plate itself by a form- locking connection.
- a form- locking connection is understood to mean not only a snap connection, but also other types of connection such as a connection wherein a tongue is moved into a groove and wherein the tongue and the groove have side walls extending in tapering manner at an angle of between 0° and 7° relative to the direction of movement. The material is deformed here during insertion, which results in a wedging action.
- a form-locking connection makes it easy to mutually connect the plates after stacking without application of adhesive or other alien materials, which could cause problems during reuse.
- This embodiment likewise relates to a method wherein the side edges of the plates are provided with side wall pieces and the side edges of the plates are mutually connected by the forming of a form-locking connection.
- Recuperators have to be provided with connecting pieces in order to carry the fluids from and to the channels.
- the plates preferably extend into connecting pieces connecting to the recuperator. Connecting pieces are also known as headers in heat exchanger jargon. It is further attractive for the plates to extend into connecting pieces connecting to the recuperator and for the side wall pieces to further extend along at least a part of the edge of the connecting pieces. This also forms the side walls of the connecting pieces at the same time as forming the side walls of the actual recuperator.
- the plates of actual recuperators extend into the connecting pieces.
- the plates are held at a mutual distance by the profile.
- No profiles are present at the position of the connecting pieces.
- recuperator instead of side walls which are in each case assembled from side wall pieces associated with the plates, it is likewise possible for the recuperator to be provided with side wall plates extending transversely of the main plane of the plates and on either side of the plates.
- a recuperator can be assembled from alternately stacked flat and profiled plates or only from profiled plates. In most cases these plates will be the same profiled plates in each case, although it is likewise possible for the recuperator to be assembled from alternately stacked plates of the first and of the second type, wherein the plates of the first and second type differ from each other.
- This embodiment further provides a method wherein plates of a first type and plates of a second type are stacked alternately during stacking.
- This measure likewise provides such a method, wherein the plates of the second type correspond to the mirror image of the plates of the first type and wherein only plates of the first type are stacked during stacking, wherein each second plate is rotated prior to stacking.
- the channels extend between adjoining plates so that the 'height' of the channels is limited to the distance between two plates.
- a further embodiment provides for this purpose the measure that channels present in plates lying on each other together form a combined channel.
- a specific embodiment therefore provides the measure that the cross- section of combined channels formed by mutually connecting channels is substantially diabolo-shaped.
- Channels with a height in the order of magnitude of the width or channels with a height which is considerably greater than the width are assumed throughout the above.
- the height is here the measurement of the cross-section of the channel transversely of the main plane of the plates.
- thermoforming since these forms release from the relevant moulds with difficulty.
- the width of the side walls is smaller than the distance between the adjoining side walls, that the channels have an elongate cross-section and that the main plane of the plates extends substantially in the longitudinal direction of the cross-section of the channels.
- the largest dimension of the cross-section of the channel hereby extends substantially parallel to the main plane of the plate.
- the above elucidated feature requires walls extending transversely of the main plane of the plates and forming the end walls of the channels.
- the plates are provided with ribs extending substantially transversely of the main plane of the plates, on both sides of the plates and parallel to the longitudinal direction of the channels, these ribs forming end walls of the channels.
- the ribs of adjoining plates are mutually connected. This is necessary for the ribs on the outer side of the plates to obtain a good seal relative to the surrounding area, but this is not per se necessary for the ribs lying on the inside, although it does make the structure more rigid so that it can better withstand high pressures of the fluids.
- the ribs of adjoining plates are preferably mutually connected by means of a form- locking connection.
- This form-locking connection simplifies assembly, since no adhesive or welding is necessary. The earlier elucidation in this description also applies to this form-locking connection.
- the cross- section of the channels is therefore substantially diabolo-shaped.
- Diabolo- shaped is understood to mean a substantially rectangular, elongate shape with a distance between the long sides which is smaller in the centre thereof than the distance between the long sides at the ends. The shape can further be provided with rounded corners and the like.
- a specific embodiment provides for this purpose the measure that the recuperator is coupled to connecting pieces which are provided with plates extending transversely of the main plane of the plates of the recuperator.
- the connecting pieces In order to obtain a good connection between the channels in the actual recuperator and the corresponding spaces of the connecting piece it is preferred for the connecting pieces to be formed into individual units which both connect with their open side to an open side of the recuperator, and for the walls of the channels extending transversely of the main plane of the channels to connect to the positions of the plates of the connecting pieces in the vicinity of the coupling surface between recuperator and the connecting pieces.
- recuperators and connecting pieces it is possible to place the separation of the channels wholly in the connecting piece.
- This configuration enables the separation of the channels to be placed partially in the actual recuperator, this simplifying the construction of the connecting pieces.
- This embodiment likewise provides a method wherein, following manufacture of the recuperator, the recuperator is provided on both sides with a connecting piece by connecting the connecting pieces at the edges of their fully open surface to the edges of the connecting pieces of the recuperator.
- the connecting pieces are connected to the recuperator by means of a form-locking connection, such as a snap connection.
- a form-locking connection such as a snap connection.
- This embodiment further provides a method wherein the connecting pieces are connected to the recuperator by means of a form-locking connection.
- Figure 1 is a schematic perspective view partially in cross-section of a plate according to a first embodiment
- Figure 2 is a view of the whole plate, a cross-section of a detail of which is shown in figure 1;
- Figure 2A is a cross-sectional view of another detail of the embodiment shown in figures 1 and 2;
- Figure 3 is a view of a variant of the plate shown in figure 2;
- Figure 4 is a perspective view of a modified version of the first embodiment according to figures 1 and 2;
- Figure 4A is a cross-sectional view parallel to the longitudinal direction of the channels of a variant of the embodiment shown in figure 4;
- FIG. 5 is a view of a recuperator formed by alternate stacking of the plates shown in figures 2 and 3;
- Figure 6 is a schematic perspective detail view in cross-section of the recuperator shown in figure 5;
- Figure 7 is a schematic perspective view of another variant of the first embodiment
- Figure 8 is a schematic perspective view of a plate according to a second embodiment
- Figure 9 is a view of the plate shown in figure 8, but which is provided with a part transposing into the header;
- Figure 10 is a cross-sectional view of a combination of two plates according to the second embodiment
- Figure 11 is a view of an assembly of two plates as shown in figure 9;
- Figure 12 is a schematic perspective view of a part of the recuperator
- Figure 13 is a schematic view of a part of the recuperator.
- FIG 14 is a detail view of the connecting piece for use in the recuperator according to figures 12 and 13.
- Figure 1 shows a plate, designated as a whole with 1, as part of a recuperator as shown in figure 5.
- Plate 1 is provided with protrusions arranged in a regular pattern and forming channels of the first type 3 a. These channels 3 a are surrounded by an end wall 4 and two side walls 5, 6. Channels 3a are open at the position of main plane la of plate 1.
- the protrusions further form channels 3b of the second type, which are enclosed between side walls 5 and 6 and end walls 7 at the position of the main plane la of plate 1.
- the plate At the position of the transition between side walls 5, 6 and end walls 4 the plate comprises chamfered portions 8 on the outer side.
- Plate 1 further comprises ridges 9 protruding at the position of the transition between side walls 5, 6 and end walls 7.
- FIG. 5 When a number of such plates 1 is assembled into a recuperator, a structure as shown in figure 5 is created. It is noted here that plates of different types have been stacked alternately, as will be elucidated below. This figure shows that chamfered portions 8 of a plate 1 fit in ridges 9 of the adjoining plate, so that the relative position of plates 1 in the direction of the main plane of the plates is fixed transversely of the direction of the channel. The same effect is also obtained in side wall pieces 10, the tongues 12 of which are retained by grooves 11 of the subsequent plate, wherein thickened portion 13a and recess 13b fit into each other and provide for the snap connection and additional seal.
- channels 3a, 3b in adjoining plates are combined into channels 3 with a largest cross-sectional measurement with double 'height'. This is caused in that plates of different types are stacked alternately. It is likewise possible to obtain channels with a height corresponding to the height of walls 5 and 6 by stacking identical plates onto each other, or to obtain channels with a height corresponding to the height of walls 5 and 6 by stacking different plates onto each other.
- These channels 3 have a substantially rectangular cross-section, although in figures 1 and 4 the thus resulting channels 3, besides having rounded corners, also have a slightly greater thickness in their centre than at their ends. It is however also possible for channels 3 to have a slightly smaller thickness in their centre than at their ends.
- a plate 1 is shown as a whole in figure 2.
- Plate 1 is provided with side wall pieces 10 extending to both sides and each having a height equal to half the height of the side walls of the channels, so that both side wall pieces together have the same working height as the channels.
- Plate 1 is further provided with channels 3 at the position of the actual recuperator, while plates 1 comprise at both end surfaces of the actual recuperator a triangular extension 14a, 14b, as is per se known from the prior art.
- These triangular parts 14a and 14b of the plate form part of the connecting pieces to be formed there, which are also known as headers.
- Figure 2A shows a form-locking connection which is attractive in that it requires no additional materials and is thereby simple.
- One of the parts to be connected 40 is provided here with a tongue 41 which has a tapered shape and which has oblique sides which extend at an angle of between 0° and 7° relative to the direction of movement.
- the other part to be connected 42 is provided with a groove 43, which is provided with side walls extending at the same or a slightly different angle.
- tongue 41 is inserted into groove 43, both parts are deformed slightly, which creates a wedging force between the oblique walls of tongue and groove which will hold together the parts sufficiently firmly.
- the geometry of tongue and groove must of course be suitable to allow insertion into each other to such an extent that the wedging force can result.
- Figure 3 shows a plate 1 which corresponds to the plate of a second type shown in figure 2, which corresponds to the plates of the first type elucidated above but wherein channels 3 have been displaced through half a pitch in order to allow channels 3 a, 3b to connect to each other as shown in figure 5. This indeed results in the channels with a double height, as elucidated above. It is attractive, though not necessary, for the plate of the second type shown in figure 3 to correspond to the plate of the first type, which is shown in figure 2, albeit rotated through 180°.
- the plate according to figure 3 further differs from that according to figure 2 due to the presence of spacers 16, which keep the triangular extensions 14 of plates 1 at a mutual distance.
- spacers 16 further have a guiding function for the fluids flowing through the connecting pieces. It is attractive to arrange spacers 16 such that their effect on the flow affects both fluids, for instance at one of the triangular extensions 14 of each of the plates according to figures 2 and 3.
- the two plates 1 are preferably the same, and both triangular extensions 14 are provided with spacers 16. If each second plate 1 is rotated during stacking, spacers 16 extend on the other side of plate 1. It is otherwise possible to place all spacers 16 in one plate 1, wherein both triangular extensions 14 are provided on both sides with spacers 16, or to provide both types of plate (so both headers) with spacers 16 on one side. It is even possible to provide one header of both types of plate with spacers 16 on both sides.
- plates 1 are preferably manufactured by injection moulding.
- the injection points In order to be able to perform the injection moulding process as quickly as possible while maintaining a plate of sufficient quality, the injection points must be chosen carefully. They are preferably placed in the vicinity of the centre of plate 1. In order to improve the flow in the vicinity of the injection point or the injection points it is recommended for plate 1 to be flat in the vicinity of the injection points.
- the modification shown in figure 4 meets this requirement by interrupting profiles 5, 6, 7 in the centre with a distribution strip 18 extending over the whole width of the plate. It is noted that figure 4 shows a modified version of the first embodiment without spacers, the modification according to figure 4 is also possible in the variant provided with spacers.
- Figure 4 A shows a variant wherein distribution strip 18 has a square cross-section and which shows how profiles 5, 6, 7 gradually transpose into distribution strip 18 in connecting areas 18a. This gradual transition enhances the injection moulding process and further keeps the flow resistance for the fluids at the position of distribution strip 18 as small as possible.
- Figure 6 shows a cross-sectional view of the embodiment shown in figure 5.
- the profile is here rectangular, although it is apparent that other profiles can also be applied, such as a triangular profile, a trapezoidal profile or such a profile which is provided with rounded corners.
- recuperator it is however also possible to assemble the recuperator by alternate stacking of flat plates 15 and plates 1 which are provided with a profile. Such a configuration is shown in figure 7.
- the plates 1 present on both sides of a flat plate 15 can then be of the same type, but can likewise be of a different type.
- the profiles of the plates 1 which are provided with profiles can further be mutually aligned, although it is also possible to shift the relative position of the plates provided with a profile relative to each other.
- the presence of the flat plates increases the use of material and thereby the cost price, although a more rigid construction of the recuperator is obtained.
- Figures 8-16 relate to a second embodiment. As shown in figure 8, plates 21 do not extend transversely of the longitudinal direction of the cross-section of channels 3, as in the first embodiment, but parallel to the longitudinal direction of this cross-section.
- thermoforming As shown in figure 8, the ribs 22a, 22b extending on either side of plates 21 are placed alternately in order to obtain the same relative placing of the channels as in the above described embodiment. It is noted that the configuration shown in figure 8 cannot be made in this way by means of thermoforming. In thermoforming, the ribs must have substantially a V-shape and should preferably all extend on one side of the plate.
- Figure 9 shows a flat plate 21 which results in rectangular channels. In order to obtain channels with a diabolo shape the plates are zigzag- shaped to some extent.
- the ribs 22a, 22b extend over the whole width of the short wall of the channel, although it is also possible for them to each extend over only some of the width of this short wall and to be connected to a relevant rib of an adjoining plate.
- FIG. 8 shows only a small part of such a wall. The complete wall extends over the whole height of the recuperator. It is however also possible to assemble such a wall, for instance from parts as shown in figure 8. Such parts can then likewise be connected to each other by a snap connection, which provides the option of adjusting the height of the recuperator.
- Figure 10 shows a cross-sectional view of this second embodiment. In this embodiment it is not possible to simply form a connection to the connecting pieces, since the channels are mutually offset.
- the rib in the vicinity of the boundary surface between the actual recuperator and the connecting piece is at a part 23a of ribs 22a guided toward an adjoining rib 22b, as shown in figure 9, so that channels 3 come to lie in line at the position of the connecting surface.
- Such guides 23b are also provided on the other side of plates 21.
- Figure 10 shows a cross-sectional view of a combination of two plates 21 which are placed mirror- symmetric ally relative to each other. This figure also shows that plates 21 are provided on their upper and underside with wall pieces 24 which are provided with a form-locking connection such as a snap connection for the purpose of assembling respectively lower wall 24 and an upper wall (not shown in the drawing) of the actual recuperator.
- plates 21 are provided on their upper and underside with wall pieces 24 which are provided with a form-locking connection such as a snap connection for the purpose of assembling respectively lower wall 24 and an upper wall (not shown in the drawing) of the actual recuperator.
- FIG 11 shows two plates 21 as a whole. This figure further shows that the plates are provided with wall pieces 24.
- Figure 12 shows an assembly of a number of plates 21, this essentially forming the counterflow portion of the actual recuperator 27.
- Figure 13 shows a view of the connecting surface of the counterflow portion of a recuperator where it has to be connected to a header. The figure clearly shows the lower wall of the recuperator which is assembled from wall pieces 24, and that the side walls are assembled from side wall pieces 27, 28. Guides 23a and 23b are also visible.
- connecting pieces In order to separate the fluid flows flowing through the channels use is made of per se known connecting pieces. Most currently known connecting pieces are formed from extensions of plates of the actual recuperator, as elucidated in the current document on the basis of the first embodiment, but such a combined embodiment appears very difficult, if not impossible, in the configuration of the second embodiment. Use is thus made of individual pairs of connecting pieces, as is otherwise shown in figure 14.
- FIG 14 shows a detail of a single connecting piece 30.
- Connecting piece 30 is provided with plates 31 extending at a mutual distance and having a substantially triangular shape.
- plates 31 are aligned with ribs 22 of the counterflow portion of the recuperator.
- the distance between plates 31 is therefore equal to the distance between the ribs present on either side of plates 21 of the recuperator, that is equal to half the distance between the ribs 22 lying on the same side of a plate 21, these being the short walls of the channels.
- Plates 31 are in each case alternately connected on both short sides of the connecting piece by respective strips 32a, 32b.
- connecting pieces just as the actual recuperator, can be manufactured by injection moulding and preferably by injection moulding of parts thereof. These parts or segments make it possible to adjust the height of the connecting pieces to the height of the actual recuperator. It is noted here that the width of the connecting piece, just as the height thereof for that matter, is dictated by the dimensions of the actual recuperator.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2016347A NL2016347B1 (en) | 2016-03-01 | 2016-03-01 | Recuperator, parts of which are made by injection molding. |
PCT/NL2017/050126 WO2017150975A1 (en) | 2016-03-01 | 2017-03-01 | Recuperator, parts of which are manufactured by injection moulding |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3423773A1 true EP3423773A1 (en) | 2019-01-09 |
Family
ID=56507780
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17716064.5A Pending EP3423773A1 (en) | 2016-03-01 | 2017-03-01 | Recuperator, parts of which are manufactured by injection moulding |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3423773A1 (en) |
CN (1) | CN109073336A (en) |
NL (1) | NL2016347B1 (en) |
WO (1) | WO2017150975A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL3457066T3 (en) * | 2017-09-15 | 2022-08-16 | Alfa Laval Corporate Ab | Baffle |
NL2026943B1 (en) | 2020-11-20 | 2022-07-01 | Level Holding Ii B V | Recuperator with improved channel configuration |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL9201945A (en) * | 1992-11-05 | 1994-06-01 | Level Energietech Bv | Heat exchanger. |
JP4816517B2 (en) * | 2006-09-28 | 2011-11-16 | パナソニック株式会社 | Heat exchange element |
JP5568231B2 (en) * | 2008-11-07 | 2014-08-06 | 日本ゴア株式会社 | Manufacturing method of molded products |
CN102548727B (en) * | 2009-08-14 | 2016-06-15 | 荷兰应用自然科学研究组织Tno | The preparation of planar membrane module |
CN102062550B (en) * | 2009-11-13 | 2012-07-11 | 王光能 | Method for processing heat exchanger membrane |
EP2614764A3 (en) * | 2012-01-12 | 2017-03-29 | Winterhalter Gastronom Gmbh | Waste water heat exchanger for a dishwasher and dishwasher |
WO2013157045A1 (en) * | 2012-04-20 | 2013-10-24 | 三菱電機株式会社 | Heat exchange element |
US10132522B2 (en) * | 2014-03-31 | 2018-11-20 | Nortek Air Solutions Canada, Inc. | Systems and methods for forming spacer levels of a counter flow energy exchange assembly |
CN105241296B (en) * | 2015-09-25 | 2018-09-14 | 森德(中国)暖通设备有限公司 | Heat exchanger |
-
2016
- 2016-03-01 NL NL2016347A patent/NL2016347B1/en active
-
2017
- 2017-03-01 WO PCT/NL2017/050126 patent/WO2017150975A1/en active Application Filing
- 2017-03-01 CN CN201780027177.2A patent/CN109073336A/en active Pending
- 2017-03-01 EP EP17716064.5A patent/EP3423773A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
NL2016347B1 (en) | 2017-09-11 |
WO2017150975A1 (en) | 2017-09-08 |
CN109073336A (en) | 2018-12-21 |
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