EP3638970A1 - Coaxial flow distribution device - Google Patents

Coaxial flow distribution device

Info

Publication number
EP3638970A1
EP3638970A1 EP18749602.1A EP18749602A EP3638970A1 EP 3638970 A1 EP3638970 A1 EP 3638970A1 EP 18749602 A EP18749602 A EP 18749602A EP 3638970 A1 EP3638970 A1 EP 3638970A1
Authority
EP
European Patent Office
Prior art keywords
face
flow distribution
main body
circumferentially extending
extending band
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.)
Withdrawn
Application number
EP18749602.1A
Other languages
German (de)
French (fr)
Inventor
Johan Siverklev
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volution Sweden AB
Original Assignee
Nordiska Klimatfabriken AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nordiska Klimatfabriken AB filed Critical Nordiska Klimatfabriken AB
Publication of EP3638970A1 publication Critical patent/EP3638970A1/en
Withdrawn legal-status Critical Current

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
    • F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/081—Air-flow control members, e.g. louvres, grilles, flaps or guide plates for guiding air around a curve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F2013/0616—Outlets that have intake openings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Definitions

  • the present disclosure generally relates to flow distribution devices, in for example ventilation.
  • it relates to a coaxial or in-line flow distribution device.
  • a heat exchanger is a flow distribution device that for example can be used for transferring heat between two or more fluids.
  • a helical coil heat exchanger is a type of heat exchanger that uses a coil which is helically wound around a core. The coil and the core are usually located in an elongated shell which has an axial inlet at one end thereof and an axial outlet at an opposite end.
  • the coil, or tube is hollow, and typically has a radial inlet portion and a radial outlet portion extending through the shell.
  • a first fluid is configured to flow through the coil and a second fluid is configured to flow in the shell outside the coil from the inlet to the outlet, in thermal contact with the coil. Heat exchange is thus provided between the two fluids by generally coaxial fluid flow.
  • An advantage with a helical coil heat exchanger is that the coil length is much longer than the length of the shell, i.e. the length of the heat exchanger, making heat exchange more efficient.
  • the coil length is much longer than the length of the shell, i.e. the length of the heat exchanger, making heat exchange more efficient.
  • a coaxial flow distribution device comprising: a first main body having a first end face and a second end face at an opposite end of the first main body with respect to the first end face, wherein the first main body is provided with a plurality of first flow distribution channels and a plurality of second flow distribution channels separated from the first flow distribution channels, the first flow distribution channels and the second flow distribution channels extending from the first end face to the second end face, wherein at the first end face a first mouth of each first flow distribution channel is provided one after the other in the circumferential direction along a first end face radial outer circumferentially extending band or section, and at the second end face a second mouth of each first flow distribution channel is provided one after the other in the circumferential direction along a second end face radial inner circumferentially extending band or section, wherein at the first end face a third mouth of each second flow distribution channel is provided one after the other in the circumferential direction along a first end face radial inner circumferentially extending band or section provided
  • Each first mouth and corresponding second mouth hence defines the inlet/outlet of a first flow distribution channel.
  • the first mouth and second mouth of each first flow distribution channel are in fluid connection or fluid communication.
  • Each third mouth and corresponding fourth mouth hence defines the inlet/outlet of a second flow distribution channel.
  • the third mouth and fourth mouth of each second flow distribution channel are in fluid connection or fluid communication.
  • a first fluid flow may thus be provided in the first flow distribution channels and a second fluid flow maybe provided in the second flow distribution channels.
  • a fluid entering the first main body through flow distribution channels in a radial outer circumferentially extending band will exit the first main body through the same flow distribution channels in a radial inner circumferentially extending band.
  • a fluid entering the first main body through flow distribution channels in a radial inner circumferentially extending band will exit the first main body through the same flow
  • the length of the first main body is one parameter that determines the pressure drop along the coaxial flow distribution device.
  • the length of the flow distribution channels is another parameter which determines the pressure drop.
  • the first main body has a cylindrical body portion extending between the first end face and the second end face.
  • the first flow distribution channels and the second flow distribution channels may be configured in a helical manner along the longitudinal direction of the first main body.
  • the pitch of the helically configured first flow distribution channels and of the second flow distribution channels may be greater than the longitudinal extension of the first main body.
  • the first main body may be rotational symmetric about a central axis thereof, extending between the first end face and the second end face.
  • each of the first end face radial inner circumferentially extending band and the second end face radial inner circumferentially extending band is funnel-shaped extending in towards the cylindrical body portion.
  • each first flow distribution channel is closed along the first end face inner circumferentially extending band, and along the second end face outer circumferentially extending band.
  • each second flow distribution channel is closed along the first end face outer circumferentially extending band, and along the second end face inner circumferentially extending band.
  • each first flow distribution channel has a central axis which is parallel with the central longitudinal axis of the first main body along the entire length of the first flow distribution channel.
  • the first flow distribution channels hence extend in a non-helical manner. This provides better turbulence conditions, with lower pressure losses.
  • a first main body of this type is very simple to manufacture, which may not be the case if the flow distribution channels are helical even with a minimal angle.
  • each first flow distribution channel is undulating in a longitudinal direction of the first main body.
  • the torsional stiffness of the flow distribution channels may thereby be increased, resulting in less deformation and better performance in use.
  • each second flow distribution channel has a central axis which is parallel with the central longitudinal axis of the first main body along the entire length of the second flow distribution channel.
  • the second flow distribution channels hence extend in a non-helical manner.
  • each second flow distribution channel is undulating in a longitudinal direction of the first main body.
  • One embodiment comprises a first flow device configured to control fluid flow at the first end face and a second flow device configured to control fluid flow at the second end face.
  • the first flow device may be a first fan or a first pump.
  • the second flow device may be a second fan or a second pump.
  • One embodiment comprises a first motor configured to drive the first flow device and the second flow device.
  • first flow device and the second flow devices are fans
  • a mirrored rotor configuration of the two fans allows for opposite directional forced fluid flows using a single motor.
  • One embodiment comprises a first motor configured to drive the first flow device and a second motor configured to drive the second flow device.
  • each third flow distribution channel extending from the third end face to the third end face, wherein at the third end face a fifth mouth of each third flow distribution channel is provided one after the other in the circumferential direction along a third end face radial outer circumferentially extending band or section, and at the fourth end face a sixth mouth of each third flow distribution channel is provided one after the other in the circumferential direction along a fourth end face radial inner circumferentially extending band or section, wherein at the third end face a seventh mouth of each fourth flow distribution channel is provided one after the other in the circumferential direction along a third end face radial inner circumferentially extending band or section provided radially inwards of the third end face radial outer circumferentially extending band, and at the fourth end face an eighth mouth of each fourth flow distribution channel is provided one after the other in the circumferential direction along a fourth end face radial outer circumferentially extending band or section provided radially outwards of the fourth end face radially inner circumferentially
  • Each seventh mouth and corresponding eighth mouth hence defines the inlet/ outlet of a fourth flow distribution channel.
  • the seventh mouth and eighth mouth of each fourth flow distribution channel are in fluid connection or fluid communication.
  • the second main body may have the same outer diameter as the first main body.
  • the radial inner/ outer circumferentially extending bands of the first main body and the second main body also have matching diameters.
  • the elongated second main body may have a longer axial extension than the first main body.
  • the second main body may be rotational symmetric about a central axis thereof, extending between the third end face and the fourth end face.
  • each third flow distribution channel is closed along the third end face inner circumferentially extending band, and along the fourth end face outer circumferentially extending band, and wherein each fourth flow distribution channel is closed along the third end face outer circumferentially extending band, and along the fourth end face inner circumferentially extending band.
  • each third flow distribution channel has a central axis which is parallel with the central longitudinal axis of the second main body along the entire length of the third flow distribution channel.
  • the third flow distribution channels hence extend in a non-helical manner.
  • each third flow distribution channel is undulating in a longitudinal direction of the second main body.
  • each fourth flow distribution channel has a central axis which is parallel with the central longitudinal axis of the second main body along the entire length of the fourth flow distribution channel.
  • the fourth flow distribution channels hence extend in a non-helical manner.
  • each fourth flow distribution channel is undulating in a longitudinal direction of the second main body.
  • Fig. la schematically shows a perspective view of a first side of an example of a coaxial flow distribution device
  • Fig. lb schematically shows a perspective view of a second side of the coaxial flow distribution device in Fig. la;
  • Fig. 2 shows a side view of the coaxial flow distribution device in Fig. l;
  • Fig. 3a shows a perspective view of an elongated second main body of an example of a coaxial flow distribution device
  • Fig. 3b shows the second main body in Fig. 3a with the circumferential wall removed
  • Fig. 4 is an exploded view of an example of a coaxial flow distribution device
  • Fig. 5 is a perspective view of the coaxial flow distribution device in Fig. 4;
  • Fig. 6 is a perspective view of another example of a coaxial flow distribution device; and Fig. 7 is a perspective view of a part including the flow distribution channels of the coaxial flow distribution device in Fig. 6.
  • Fig. 1 shows an example of a coaxial or in-line flow distribution device.
  • the coaxial flow distribution device is configured to accommodate for more than one fluid flow.
  • coaxial is here meant that the fluid flows in the coaxial flow distribution device are generally coaxial.
  • the coaxial flow distribution device 1 comprises a first main body 3.
  • the first main body 3 maybe rotationally symmetric.
  • the first main body 3 may for example be cylindrical or essentially cylindrical.
  • the first main body 3 has a first end face 3a shown in Fig. la, and a second end face 3b, shown in Figs la and lb.
  • the first end face 3a and the second end face 3b define opposite ends of the first main body 3.
  • the first main body 3 has a cylindrical body portion 4 extending between the first end face 3a and the second end face 3b.
  • the first main body 3 is provided with a plurality of first flow distribution channels 5a extending through the first main body 3 from the first end face 3a to the second end face 3b.
  • Each first flow distribution channel 5a has a respective first mouth or first opening 5b.
  • the first end face 3a is provided with the first mouths 5b.
  • the first mouths 5b are provided one after the other in the circumferential direction along a first end face radial outer
  • the first mouths 5b are evenly distributed along the first end face radial outer circumferentially extending band 7.
  • the first main body 3 is provided with a plurality of second flow distribution channels 9a extending through the first main body 3 from the first end face 3a to the second end face 3b.
  • Each second flow distribution channel 9a has a respective third mouth or third opening 8b.
  • the first end face 3a is provided with the third mouths 9b.
  • the third mouths 9b are provided one after the other in the circumferential direction along a first end face radial inner circumferentially extending band or section 11.
  • the first end face radial inner circumferentially extending band 11 is located radially inwards relative to the first end face radial outer circumferentially extending band 7.
  • the second mouths 9b are evenly distributed along the first end face radial inner circumferentially extending band 11.
  • the exemplified first main body 3 furthermore comprises an optional central through-opening 13 extending through the first main body 3 from the first end face 3a to the second end face 3b.
  • Fig. lb shows the second end face 3b of the first main body 3.
  • Each first flow distribution channel 5a has a respective second mouth or second opening 5c.
  • the second end face 3b is provided with the second mouths 5c.
  • the second mouths 5c are provided one after the other in the circumferential direction along a second end face radial inner circumferentially extending band or section 15.
  • Each first flow distribution channel 5a hence has a first mouth 5b provided on the first end face 3a and a second mouth 5c provided on the second end face 3b.
  • the first mouth 5b and the second mouth 5c are in fluid communication.
  • Each second flow distribution channel 9a has a respective fourth mouth or fourth opening 9c.
  • the second end face 3b is provided with the fourth mouths 9c.
  • the fourth mouths 9c are provided one after
  • Each second flow distribution channel 9a hence has a third mouth 9b provided on the first end face 3a and a fourth mouth fourth mouth 9c provided on the second end face 3b.
  • the third mouth 9b and the fourth mouth 9c are in fluid communication.
  • the second end face radial outer circumferentially extending band 17 is located radially outside of the second end face radial inner circumferentially extending band 15.
  • the first main body 3 has a first intermediate wall portion 8a provided between each pair of adjacent first mouths 5b. Each first intermediate wall portion 8a closes off a second flow distribution channel 9a at the first end face 3a, in particular along the first end face radial outer circumferentially extending band 7. Radially aligned with and inwards from each first intermediate wall portion 8a is a third mouth 9b of a second flow distribution channel 9a. Each first intermediate wall portion 8a hence directs or guides fluid flow between a third mouth 9b and a fourth mouth 9 c of a second flow distribution channel 9a. Similarly, there is a second wall portion 10a between each adjacent pair of third mouths 9b.
  • each of the first end face radial inner circumferentially extending band 11 and the second end face radial inner circumferentially extending band 15 is funnel-shaped, extending in towards the cylindrical body portion 4.
  • the first end face radial inner circumferential extending band and the second end face radial inner circumferentially extending bands could be essentially planar, extending parallel with a cross-section of the first main body.
  • Fig. 2 shows a side view of the coaxial flow distribution device 1.
  • the cylindrical body portion 4 has a circumferential wall which forms a radial wall, in particular a radially outer wall, of the first flow distribution channels 5a and the second flow distribution channels 9 a. Due to the above-described design of the first and second fluid distribution channels 5a and 9a any fluid flowing through the coaxial flow distribution device 1 will change position radially inside the device 1 as it flows through it, i.e. between the first end face 3a and the second end face 3b.
  • the coaxial flow distribution device may thus find a plurality of different applications. For example, the coaxial flow distribution device 1 shown in Fig.
  • the coaxial flow distribution device 1 may be used to change the flow distribution in a double pipe heat exchanger by arranging it between two sections of a double pipe heat exchanger.
  • the coaxial flow distribution device lean for example be used to redirect inner pipe fluid flow to the outer pipe and vice-versa.
  • a coaxial heat exchanger can be obtained, as will be described in what follows.
  • the coaxial flow distribution device 1 may include a first flow device and a second flow device. Each of these flow devices may for example be a fan or a pump, depending on the application.
  • the first flow device may be provided adjacent to the first end face 3a and the second flow device may be provided adjacent to the second end face 3b.
  • the coaxial flow distribution device 1 may further comprise a first motor.
  • the first motor may for example be placed in the central through-opening 13 of the first main body 3.
  • the first motor may be configured to drive both the first flow device and the second flow device.
  • the rotors of the two fans may be arranged in a mirrored configuration. Thus, although they rotate in the same direction, they will provide fluid flow in opposite directions.
  • the coaxial flow distribution device 1 may in addition to the first motor comprise a second motor.
  • the second motor could be placed in the central through-opening 13.
  • the first motor may in this case be configured to drive the first flow device and the second motor may be configured to drive the second flow device.
  • Independent control of the two flow devices may thus be provided. For example, in the event of two fans, both fans could be controlled to provide fluid flow in the same direction or in opposite directions, with the same or different speeds.
  • the coaxial fluid distribution device 1 may additionally comprise a second main body 19, shown in Fig. 3a.
  • the second main body 19 is essentially identical to the first main body 3, although the second main body 19 has an elongated shape.
  • the second main body 19 has a third end face 19 a and a fourth end face 19b located at an opposite end of the second main body 19 relative to the third end face 19 a.
  • the second main body 19 has a plurality of third flow distribution channels 21a extending from the third end face 19a to the fourth end face 19b.
  • Each third flow distribution channel 21a has a fifth mouth 21b provided on the third end face 19a and a sixth mouth provided on the fourth end face 19b (not shown).
  • the second main body 19 has a plurality of fourth flow distribution channels 23a extending from the third end face 19a to the fourth end face 19b.
  • Each fourth flow distribution channel 23a has a seventh mouth 23b provided on the third end face 19a and an eighth mouth 23c provided on the fourth end face 19b.
  • the second main body 19 has a third end face radial outer circumferentially band or section 20.
  • the third end face radial outer circumferentially band 20 is provided with the fifth mouths 21b provided one after the other in the circumferential direction.
  • the second main body 19 has a fourth end face radial inner circumferentially band or section, not shown.
  • the fourth end face radial inner circumf erentially band is provided with the sixth mouths 21c.
  • the second main body 19 has a third end face radial inner circumferentially band or section 25.
  • the third end face radial inner circumferentially band 25 is provided with the seventh mouths 23b provided one after the other in the circumferential direction.
  • the second main body 19 has a fourth end face radial outer circumferentially band or section, not shown.
  • the fourth end face radial inner circumf erentially band is provided with the sixth mouths 21c.
  • the second main body 19 has a cylindrical body portion 27 extending between the third end face 19a and the fourth end face 19b.
  • the second main body 19 has a circumferential wall which defines a radial wall, in particular a radially outer wall, of the third flow distribution channels 21a and the fourth flow distribution channels 23a.
  • Fig. 3b shows the second main body 19 with the circumferential wall removed to expose the third flow distribution channels 21a and the fourth flow distribution channels 23a.
  • the second main body is also provided with intermediate wall portions to direct/guide the fluid flow to the radial inner/outer circumferentially extending bands of the two end faces 19a and 19b.
  • the flow distribution channels 5a, 9a, 21a, 23a may for example be extending straight between the two faces, or they may extending in a helical manner as illustrated in the present examples.
  • the pitch maybe made short or long relative to the length of corresponding main body 3, 19.
  • the pitch of the helical first and second flow distribution channels 5a and 9a is longer than the length of the first main body 3.
  • the pitch of the helical third and fourth flow distribution channels 21a and 23a is longer than the length of the second main body 19.
  • the second main body 19 is configured to be arranged coaxially with the first main body 3.
  • the second end face 3b of the first main body 3 may in particular be placed adjacent to the third end face 19a of the second main body 19.
  • Fig. 5 shows an example of a coaxial flow distribution device 1 configured to be used for in-room ventilation.
  • the coaxial flow distribution device 1 is configured to be mounted through an outer wall of a building.
  • exemplified coaxial flow distribution device 1 comprises the first main body 3, two second main bodies 19', similar to the second main body 19 described above, forming heat exchangers, a first flow device 29a in the form of a first fan, a second flow device 29 in the form of a second fan, and a common circumferential wall 31.
  • the number of second main bodies used depends on the wall thickness, using a set length of these components.
  • the second main body could be manufactured with a length adapted to the particular wall thickness.
  • Each of the above-mentioned components are configured to be mounted coaxially, with the first main body 3 placed in the middle and a respective one of the first fan and the second fan being arranged at a respective side of the first main body 3.
  • the two fans maybe controlled by one common motor, or a respective motor.
  • the coaxial flow distribution device 1 may additionally comprise end caps 33 provided with through-openings.
  • the two second main bodies 19' could be designed like the second main body 19, with tapering third and fourth end face radial outer circumferentially extending bands.
  • the coaxial flow distribution device 1 may according to one example comprise one or more power converters configured to control the operation of the motor(s), and a wireless device configured to wirelessly receive motor command values for controlling the power convert er(s).
  • a user may thus be able to control the operation of the fan(s) using for example a mobile device such as a mobile phone or tablet computer equipped with a dedicated application to control the coaxial flow distribution device l.
  • a plurality of coaxial flow distribution devices ⁇ maybe installed in a building, for example in a living space such as a flat. In this case, all the coaxial flow distribution devices ⁇ may be interconnected via the application. This may serve as an alternative to a heat recovery ventilation system.
  • Fig. 6 shows the coaxial flow distribution device ⁇ in a mounted state.
  • the first end 35a of the coaxial flow distribution device 1 maybe located inside the building and the second end 35b maybe located outside the building.
  • a plurality of fluid flow modes may be obtained. For example, if the two fans are controlled by a respective motor, one fan could be driven in one direction and the other in an opposite direction, with the same or with different speeds. In this manner, air can be drawn out from the room while fresh air can be forced into the room. If both fans are driven in the same direction, efficient venting or cooling may be provided, e.g. to empty a room of smoke in case of a fire or to cool down a bedroom prior to sleeping.
  • Fig. 6 shows a perspective view of another example of a coaxial flow
  • This first/second main body 3', 19' is similar to those previously described, and can be used in the same way as in the embodiment shown in Fig. 4 for example.
  • the example shown in Fig. 6 differs in that the first flow distribution channels 5a' and second flow distribution channels 9 'a in the case of the first main body 3' and third flow distribution channels 21a' and fourth flow distribution channels 23a' in the case of the second main body 19 'a are essentially straight.
  • the central axis of each first flow distribution channel and the central axis of each second flow distribution channel are parallel with the central longitudinal axis of the first main body along the entire length of the first flow distribution channel and the second flow distribution channel in question.
  • each third flow distribution channel and the central axis of each fourth flow distribution channel are parallel with the central longitudinal axis of the second main body along the entire length of the third flow distribution channel and the fourth flow distribution channel in question.
  • Each first and second flow distribution channel may however be undulating in the longitudinal direction of the first main body 3' and each third and fourth flow distribution channel maybe undulating in the longitudinal direction of the second main body 19'.
  • the undulations of the first and second flow distribution channels may be parallel with each other.
  • the undulations of the third and fourth flow distribution channels maybe parallel with each other.
  • the first flow distribution channels 5a' and the second flow distribution channels 9a' may for example be formed by a single corrugated sheath, which has been rolled up in a single turn as shown in Fig. 7. This also applies in the case of the second main body 19'.
  • the end faces shown in Fig. 6 provide the required blocking of the first flow distribution channels and second flow distribution channels in the case of the first main body 3', to obtain the first/second end face radial inner/outer
  • a radially inner half of a channel may be closed and the radially outer half may be open, while on the opposite side this is reversed, i.e. the inner half is left open and the outer half is closed.
  • This may for example be obtained by two identical end faces, with the one end face being rotated the width of one flow distribution channel relative to the other end face.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present disclosure relates to a coaxial flow distribution device (1) comprising: a first main body (3) having a first end face (3a) and a second end face (3b) at an opposite end of the first main body (3) with respect to the first end face (3a), wherein the first main body (3) is provided with a plurality of first flow distribution channels (5a) and a plurality of second flow distribution channels (9a) separated from the first flow distribution channels (5a), the first flow distribution channels (3a) and the second flow distribution channels (5a) extending from the first end face (3a) to the second end face (3b), wherein at the first end face (3a) a first mouth (5b) of each first flow distribution channel (5a) is provided one after the other in the circumferential direction along a first end face radial outer circumferentially extending band (7), and at the second end face (3b) a second mouth of each first flow distribution channel (5a) is provided one after the other in the circumferential direction along a second end face radial inner circumferentially extending band(15), wherein at the first end face (3a) a third mouth (9b) of each second flow distribution channel (9a) is provided one after the other in the circumferential direction along a first end face radial inner circumferentially extending band (11) provided radially inwards of the first end face radial outer circumferentially extending band (7), and at the second end face (3b) a fourth mouth of each second flow distribution channel (9a) is provided one after the other in the circumferential direction along a second end face radial outer circumferentially extending band (17) provided radially outwards of the second end face radially inner circumferentially extending band, and wherein the first main body (3) has a circumferential wall forming a radial outer wall of the first flow distribution channels (5a) and the second flow distribution channels (9a) between the first end face (3a) and the second end face (3b).

Description

COAXIAL FLOW DISTRIBUTION DEVICE
TECHNICAL FIELD
The present disclosure generally relates to flow distribution devices, in for example ventilation. In particular, it relates to a coaxial or in-line flow distribution device.
BACKGROUND
A heat exchanger is a flow distribution device that for example can be used for transferring heat between two or more fluids. A helical coil heat exchanger is a type of heat exchanger that uses a coil which is helically wound around a core. The coil and the core are usually located in an elongated shell which has an axial inlet at one end thereof and an axial outlet at an opposite end. The coil, or tube, is hollow, and typically has a radial inlet portion and a radial outlet portion extending through the shell. A first fluid is configured to flow through the coil and a second fluid is configured to flow in the shell outside the coil from the inlet to the outlet, in thermal contact with the coil. Heat exchange is thus provided between the two fluids by generally coaxial fluid flow. An advantage with a helical coil heat exchanger is that the coil length is much longer than the length of the shell, i.e. the length of the heat exchanger, making heat exchange more efficient. On the downside, there is a significant pressure drop in the coil, due to the length thereof.
SUMMARY
In view of the above, a general object of the present disclosure is to provide a coaxial flow distribution device which solves or at least mitigates problems of the prior art.
There is hence provided a coaxial flow distribution device comprising: a first main body having a first end face and a second end face at an opposite end of the first main body with respect to the first end face, wherein the first main body is provided with a plurality of first flow distribution channels and a plurality of second flow distribution channels separated from the first flow distribution channels, the first flow distribution channels and the second flow distribution channels extending from the first end face to the second end face, wherein at the first end face a first mouth of each first flow distribution channel is provided one after the other in the circumferential direction along a first end face radial outer circumferentially extending band or section, and at the second end face a second mouth of each first flow distribution channel is provided one after the other in the circumferential direction along a second end face radial inner circumferentially extending band or section, wherein at the first end face a third mouth of each second flow distribution channel is provided one after the other in the circumferential direction along a first end face radial inner circumferentially extending band or section provided radially inwards of the first end face radial outer circumferentially extending band, and at the second end face a fourth mouth of each second flow distribution channel is provided one after the other in the circumferential direction along a second end face radial outer circumferentially extending band or section provided radially outwards of the second end face radially inner circumferentially extending band, and wherein the first main body has a circumferential wall forming a radial outer wall of the first flow distribution channels and the second flow distribution channels between the first end face and the second end face.
Each first mouth and corresponding second mouth hence defines the inlet/outlet of a first flow distribution channel. The first mouth and second mouth of each first flow distribution channel are in fluid connection or fluid communication.
Each third mouth and corresponding fourth mouth hence defines the inlet/outlet of a second flow distribution channel. The third mouth and fourth mouth of each second flow distribution channel are in fluid connection or fluid communication. A first fluid flow may thus be provided in the first flow distribution channels and a second fluid flow maybe provided in the second flow distribution channels. A fluid entering the first main body through flow distribution channels in a radial outer circumferentially extending band will exit the first main body through the same flow distribution channels in a radial inner circumferentially extending band. A fluid entering the first main body through flow distribution channels in a radial inner circumferentially extending band will exit the first main body through the same flow
distribution channels in a radial outer circumferentially extending band. This creates a radial redirection of the fluid flows. This enables a plurality of different creative uses of the coaxial flow distribution device. Examples include heat exchangers and building ventilation.
The length of the first main body is one parameter that determines the pressure drop along the coaxial flow distribution device. The length of the flow distribution channels is another parameter which determines the pressure drop. By designing the coaxial flow distribution device with suitable first main body length and flow distribution channel length, a coaxial flow distribution device with a low pressure drop maybe obtained.
According to one embodiment the first main body has a cylindrical body portion extending between the first end face and the second end face.
The first flow distribution channels and the second flow distribution channels may be configured in a helical manner along the longitudinal direction of the first main body.
The pitch of the helically configured first flow distribution channels and of the second flow distribution channels may be greater than the longitudinal extension of the first main body. The first main body may be rotational symmetric about a central axis thereof, extending between the first end face and the second end face.
According to one embodiment each of the first end face radial inner circumferentially extending band and the second end face radial inner circumferentially extending band is funnel-shaped extending in towards the cylindrical body portion.
According to one embodiment each first flow distribution channel is closed along the first end face inner circumferentially extending band, and along the second end face outer circumferentially extending band.
According to one embodiment each second flow distribution channel is closed along the first end face outer circumferentially extending band, and along the second end face inner circumferentially extending band.
According to one embodiment each first flow distribution channel has a central axis which is parallel with the central longitudinal axis of the first main body along the entire length of the first flow distribution channel. The first flow distribution channels hence extend in a non-helical manner. This provides better turbulence conditions, with lower pressure losses.
Additionally, a first main body of this type is very simple to manufacture, which may not be the case if the flow distribution channels are helical even with a minimal angle.
According to one embodiment each first flow distribution channel is undulating in a longitudinal direction of the first main body. The torsional stiffness of the flow distribution channels may thereby be increased, resulting in less deformation and better performance in use.
According to one embodiment each second flow distribution channel has a central axis which is parallel with the central longitudinal axis of the first main body along the entire length of the second flow distribution channel. The second flow distribution channels hence extend in a non-helical manner. According to one embodiment each second flow distribution channel is undulating in a longitudinal direction of the first main body.
One embodiment comprises a first flow device configured to control fluid flow at the first end face and a second flow device configured to control fluid flow at the second end face. The first flow device may be a first fan or a first pump.
The second flow device may be a second fan or a second pump.
One embodiment comprises a first motor configured to drive the first flow device and the second flow device. In case the first flow device and the second flow devices are fans, a mirrored rotor configuration of the two fans allows for opposite directional forced fluid flows using a single motor.
One embodiment comprises a first motor configured to drive the first flow device and a second motor configured to drive the second flow device.
Individual control of the first flow device and the second flow device may thus be provided.
One embodiment comprises: an elongated second main body having a third end face and a fourth end face at an opposite end of the second main body with respect to the third end face, wherein the second main body is provided with a plurality of third flow distribution channels and a plurality of fourth flow distribution channels separated from the third flow distribution channels, the third flow distribution channels and the fourth flow
distribution channels extending from the third end face to the third end face, wherein at the third end face a fifth mouth of each third flow distribution channel is provided one after the other in the circumferential direction along a third end face radial outer circumferentially extending band or section, and at the fourth end face a sixth mouth of each third flow distribution channel is provided one after the other in the circumferential direction along a fourth end face radial inner circumferentially extending band or section, wherein at the third end face a seventh mouth of each fourth flow distribution channel is provided one after the other in the circumferential direction along a third end face radial inner circumferentially extending band or section provided radially inwards of the third end face radial outer circumferentially extending band, and at the fourth end face an eighth mouth of each fourth flow distribution channel is provided one after the other in the circumferential direction along a fourth end face radial outer circumferentially extending band or section provided radially outwards of the fourth end face radially inner circumferentially extending band, and wherein the second main body has a circumferential wall forming a radial outer wall of the third flow distribution channels and the fourth flow distribution channels between the third end face and the fourth end face, wherein the second main body is configured to be arranged coaxially with the first main body, with the second end face of the first main body arranged adjacent to the third end face of the second main body. Each fifth mouth and corresponding sixth mouth hence defines the inlet/outlet of a third flow distribution channel. The fifth mouth and sixth mouth of each third flow distribution channel are in fluid connection or fluid communication.
Each seventh mouth and corresponding eighth mouth hence defines the inlet/ outlet of a fourth flow distribution channel. The seventh mouth and eighth mouth of each fourth flow distribution channel are in fluid connection or fluid communication.
The second main body may have the same outer diameter as the first main body. The radial inner/ outer circumferentially extending bands of the first main body and the second main body also have matching diameters.
The elongated second main body may have a longer axial extension than the first main body.
The second main body may be rotational symmetric about a central axis thereof, extending between the third end face and the fourth end face. According to one embodiment each third flow distribution channel is closed along the third end face inner circumferentially extending band, and along the fourth end face outer circumferentially extending band, and wherein each fourth flow distribution channel is closed along the third end face outer circumferentially extending band, and along the fourth end face inner circumferentially extending band.
According to one embodiment each third flow distribution channel has a central axis which is parallel with the central longitudinal axis of the second main body along the entire length of the third flow distribution channel. The third flow distribution channels hence extend in a non-helical manner.
According to one embodiment each third flow distribution channel is undulating in a longitudinal direction of the second main body.
According to one embodiment each fourth flow distribution channel has a central axis which is parallel with the central longitudinal axis of the second main body along the entire length of the fourth flow distribution channel. The fourth flow distribution channels hence extend in a non-helical manner.
According to one embodiment each fourth flow distribution channel is undulating in a longitudinal direction of the second main body.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the element, apparatus, component, means, etc. are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, etc., unless explicitly stated otherwise.
BRIEF DESCRIPTION OF THE DRAWINGS
The specific embodiments of the inventive concept will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. la schematically shows a perspective view of a first side of an example of a coaxial flow distribution device;
Fig. lb schematically shows a perspective view of a second side of the coaxial flow distribution device in Fig. la; Fig. 2 shows a side view of the coaxial flow distribution device in Fig. l;
Fig. 3a shows a perspective view of an elongated second main body of an example of a coaxial flow distribution device;
Fig. 3b shows the second main body in Fig. 3a with the circumferential wall removed;
Fig. 4 is an exploded view of an example of a coaxial flow distribution device;
Fig. 5 is a perspective view of the coaxial flow distribution device in Fig. 4;
Fig. 6 is a perspective view of another example of a coaxial flow distribution device; and Fig. 7 is a perspective view of a part including the flow distribution channels of the coaxial flow distribution device in Fig. 6.
DETAILED DESCRIPTION
The inventive concept will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplifying
embodiments are shown. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art. Like numbers refer to like elements throughout the description.
Fig. 1 shows an example of a coaxial or in-line flow distribution device. The coaxial flow distribution device is configured to accommodate for more than one fluid flow. With the term "coaxial" is here meant that the fluid flows in the coaxial flow distribution device are generally coaxial. The coaxial flow distribution device 1 comprises a first main body 3. The first main body 3 maybe rotationally symmetric. The first main body 3 may for example be cylindrical or essentially cylindrical. The first main body 3 has a first end face 3a shown in Fig. la, and a second end face 3b, shown in Figs la and lb. The first end face 3a and the second end face 3b define opposite ends of the first main body 3. The first main body 3 has a cylindrical body portion 4 extending between the first end face 3a and the second end face 3b.
The first main body 3 is provided with a plurality of first flow distribution channels 5a extending through the first main body 3 from the first end face 3a to the second end face 3b. Each first flow distribution channel 5a has a respective first mouth or first opening 5b. The first end face 3a is provided with the first mouths 5b. The first mouths 5b are provided one after the other in the circumferential direction along a first end face radial outer
circumferentially extending band or section 7.
The first mouths 5b are evenly distributed along the first end face radial outer circumferentially extending band 7. The first main body 3 is provided with a plurality of second flow distribution channels 9a extending through the first main body 3 from the first end face 3a to the second end face 3b. Each second flow distribution channel 9a has a respective third mouth or third opening 8b. The first end face 3a is provided with the third mouths 9b. The third mouths 9b are provided one after the other in the circumferential direction along a first end face radial inner circumferentially extending band or section 11. The first end face radial inner circumferentially extending band 11 is located radially inwards relative to the first end face radial outer circumferentially extending band 7.
The second mouths 9b are evenly distributed along the first end face radial inner circumferentially extending band 11.
The exemplified first main body 3 furthermore comprises an optional central through-opening 13 extending through the first main body 3 from the first end face 3a to the second end face 3b. Fig. lb shows the second end face 3b of the first main body 3. Each first flow distribution channel 5a has a respective second mouth or second opening 5c. The second end face 3b is provided with the second mouths 5c. The second mouths 5c are provided one after the other in the circumferential direction along a second end face radial inner circumferentially extending band or section 15. Each first flow distribution channel 5a hence has a first mouth 5b provided on the first end face 3a and a second mouth 5c provided on the second end face 3b. The first mouth 5b and the second mouth 5c are in fluid communication. Each second flow distribution channel 9a has a respective fourth mouth or fourth opening 9c. The second end face 3b is provided with the fourth mouths 9c. The fourth mouths 9c are provided one after the other in the
circumferential direction along a second end face radial outer
circumferentially extending band or section 17. Each second flow distribution channel 9a hence has a third mouth 9b provided on the first end face 3a and a fourth mouth fourth mouth 9c provided on the second end face 3b. The third mouth 9b and the fourth mouth 9c are in fluid communication.
The second end face radial outer circumferentially extending band 17 is located radially outside of the second end face radial inner circumferentially extending band 15.
The first main body 3 has a first intermediate wall portion 8a provided between each pair of adjacent first mouths 5b. Each first intermediate wall portion 8a closes off a second flow distribution channel 9a at the first end face 3a, in particular along the first end face radial outer circumferentially extending band 7. Radially aligned with and inwards from each first intermediate wall portion 8a is a third mouth 9b of a second flow distribution channel 9a. Each first intermediate wall portion 8a hence directs or guides fluid flow between a third mouth 9b and a fourth mouth 9 c of a second flow distribution channel 9a. Similarly, there is a second wall portion 10a between each adjacent pair of third mouths 9b. Each second intermediate wall portion 10a closes off a first flow distribution channel 5a at the first end face 3a, in particular along the first end face radial inner circumferentially extending band 11. Radially aligned with and outwards from each second intermediate wall portion 10a is a first mouth 5b of a first flow distribution channel 5a. Each second intermediate wall portion 10a hence directs or guides fluid flow between a first mouth 5b and a second mouth 5c of a first flow distribution channel 5a.
According to the example shown in Figs la and lb each of the first end face radial inner circumferentially extending band 11 and the second end face radial inner circumferentially extending band 15 is funnel-shaped, extending in towards the cylindrical body portion 4. In an alternative example, the first end face radial inner circumferential extending band and the second end face radial inner circumferentially extending bands could be essentially planar, extending parallel with a cross-section of the first main body.
Fig. 2 shows a side view of the coaxial flow distribution device 1. The cylindrical body portion 4 has a circumferential wall which forms a radial wall, in particular a radially outer wall, of the first flow distribution channels 5a and the second flow distribution channels 9 a. Due to the above-described design of the first and second fluid distribution channels 5a and 9a any fluid flowing through the coaxial flow distribution device 1 will change position radially inside the device 1 as it flows through it, i.e. between the first end face 3a and the second end face 3b. The coaxial flow distribution device may thus find a plurality of different applications. For example, the coaxial flow distribution device 1 shown in Fig. 1 may be used to change the flow distribution in a double pipe heat exchanger by arranging it between two sections of a double pipe heat exchanger. The coaxial flow distribution device lean for example be used to redirect inner pipe fluid flow to the outer pipe and vice-versa. In another alternative, extending the cylindrical body portion 4, a coaxial heat exchanger can be obtained, as will be described in what follows. In addition to the first main body 3, the coaxial flow distribution device 1 may include a first flow device and a second flow device. Each of these flow devices may for example be a fan or a pump, depending on the application. The first flow device may be provided adjacent to the first end face 3a and the second flow device may be provided adjacent to the second end face 3b. The coaxial flow distribution device 1 may further comprise a first motor. The first motor may for example be placed in the central through-opening 13 of the first main body 3.
The first motor may be configured to drive both the first flow device and the second flow device. In the event of fans, the rotors of the two fans may be arranged in a mirrored configuration. Thus, although they rotate in the same direction, they will provide fluid flow in opposite directions.
According to one variation, the coaxial flow distribution device 1 may in addition to the first motor comprise a second motor. The second motor could be placed in the central through-opening 13. The first motor may in this case be configured to drive the first flow device and the second motor may be configured to drive the second flow device. Independent control of the two flow devices may thus be provided. For example, in the event of two fans, both fans could be controlled to provide fluid flow in the same direction or in opposite directions, with the same or different speeds.
The coaxial fluid distribution device 1 may additionally comprise a second main body 19, shown in Fig. 3a. The second main body 19 is essentially identical to the first main body 3, although the second main body 19 has an elongated shape. The second main body 19 has a third end face 19 a and a fourth end face 19b located at an opposite end of the second main body 19 relative to the third end face 19 a.
The second main body 19 has a plurality of third flow distribution channels 21a extending from the third end face 19a to the fourth end face 19b. Each third flow distribution channel 21a has a fifth mouth 21b provided on the third end face 19a and a sixth mouth provided on the fourth end face 19b (not shown). The second main body 19 has a plurality of fourth flow distribution channels 23a extending from the third end face 19a to the fourth end face 19b. Each fourth flow distribution channel 23a has a seventh mouth 23b provided on the third end face 19a and an eighth mouth 23c provided on the fourth end face 19b.
The second main body 19 has a third end face radial outer circumferentially band or section 20. The third end face radial outer circumferentially band 20 is provided with the fifth mouths 21b provided one after the other in the circumferential direction. The second main body 19 has a fourth end face radial inner circumferentially band or section, not shown. The fourth end face radial inner circumf erentially band is provided with the sixth mouths 21c.
The second main body 19 has a third end face radial inner circumferentially band or section 25. The third end face radial inner circumferentially band 25 is provided with the seventh mouths 23b provided one after the other in the circumferential direction. The second main body 19 has a fourth end face radial outer circumferentially band or section, not shown. The fourth end face radial inner circumf erentially band is provided with the sixth mouths 21c.
The second main body 19 has a cylindrical body portion 27 extending between the third end face 19a and the fourth end face 19b. The second main body 19 has a circumferential wall which defines a radial wall, in particular a radially outer wall, of the third flow distribution channels 21a and the fourth flow distribution channels 23a. Fig. 3b shows the second main body 19 with the circumferential wall removed to expose the third flow distribution channels 21a and the fourth flow distribution channels 23a. As can be seen, the second main body is also provided with intermediate wall portions to direct/guide the fluid flow to the radial inner/outer circumferentially extending bands of the two end faces 19a and 19b.
The flow distribution channels 5a, 9a, 21a, 23a may for example be extending straight between the two faces, or they may extending in a helical manner as illustrated in the present examples. Depending on the desired length of the flow distribution channels 5a, 9a, 21a, 23a, the pitch maybe made short or long relative to the length of corresponding main body 3, 19. In the present example, the pitch of the helical first and second flow distribution channels 5a and 9a is longer than the length of the first main body 3. Similarly, in the present example, the pitch of the helical third and fourth flow distribution channels 21a and 23a is longer than the length of the second main body 19.
The second main body 19 is configured to be arranged coaxially with the first main body 3. The second end face 3b of the first main body 3 may in particular be placed adjacent to the third end face 19a of the second main body 19.
Fig. 5 shows an example of a coaxial flow distribution device 1 configured to be used for in-room ventilation. The coaxial flow distribution device 1 is configured to be mounted through an outer wall of a building. The
exemplified coaxial flow distribution device 1 comprises the first main body 3, two second main bodies 19', similar to the second main body 19 described above, forming heat exchangers, a first flow device 29a in the form of a first fan, a second flow device 29 in the form of a second fan, and a common circumferential wall 31. It is to be noted that the number of second main bodies used depends on the wall thickness, using a set length of these components. As an alternative to using several second main bodies for a thick wall, the second main body could be manufactured with a length adapted to the particular wall thickness.
Each of the above-mentioned components are configured to be mounted coaxially, with the first main body 3 placed in the middle and a respective one of the first fan and the second fan being arranged at a respective side of the first main body 3. The two fans maybe controlled by one common motor, or a respective motor. The coaxial flow distribution device 1 may additionally comprise end caps 33 provided with through-openings. Alternatively, the two second main bodies 19' could be designed like the second main body 19, with tapering third and fourth end face radial outer circumferentially extending bands. The coaxial flow distribution device 1 may according to one example comprise one or more power converters configured to control the operation of the motor(s), and a wireless device configured to wirelessly receive motor command values for controlling the power convert er(s). A user may thus be able to control the operation of the fan(s) using for example a mobile device such as a mobile phone or tablet computer equipped with a dedicated application to control the coaxial flow distribution device l.
A plurality of coaxial flow distribution devices ι maybe installed in a building, for example in a living space such as a flat. In this case, all the coaxial flow distribution devices ι may be interconnected via the application. This may serve as an alternative to a heat recovery ventilation system.
Fig. 6 shows the coaxial flow distribution device ι in a mounted state. When mounted in a wall, the first end 35a of the coaxial flow distribution device 1 maybe located inside the building and the second end 35b maybe located outside the building. Depending on how the two fans are controlled, a plurality of fluid flow modes may be obtained. For example, if the two fans are controlled by a respective motor, one fan could be driven in one direction and the other in an opposite direction, with the same or with different speeds. In this manner, air can be drawn out from the room while fresh air can be forced into the room. If both fans are driven in the same direction, efficient venting or cooling may be provided, e.g. to empty a room of smoke in case of a fire or to cool down a bedroom prior to sleeping.
Fig. 6 shows a perspective view of another example of a coaxial flow
distribution device 1'. In particular, another example of a first main
body/ second main body 3', 19' is depicted.
This first/second main body 3', 19' is similar to those previously described, and can be used in the same way as in the embodiment shown in Fig. 4 for example. The example shown in Fig. 6 however differs in that the first flow distribution channels 5a' and second flow distribution channels 9 'a in the case of the first main body 3' and third flow distribution channels 21a' and fourth flow distribution channels 23a' in the case of the second main body 19 'a are essentially straight. Preferably, the central axis of each first flow distribution channel and the central axis of each second flow distribution channel are parallel with the central longitudinal axis of the first main body along the entire length of the first flow distribution channel and the second flow distribution channel in question. The central axis of each third flow distribution channel and the central axis of each fourth flow distribution channel are parallel with the central longitudinal axis of the second main body along the entire length of the third flow distribution channel and the fourth flow distribution channel in question. Each first and second flow distribution channel may however be undulating in the longitudinal direction of the first main body 3' and each third and fourth flow distribution channel maybe undulating in the longitudinal direction of the second main body 19'. The undulations of the first and second flow distribution channels may be parallel with each other. The undulations of the third and fourth flow distribution channels maybe parallel with each other.
For the first main body 3', the first flow distribution channels 5a' and the second flow distribution channels 9a' may for example be formed by a single corrugated sheath, which has been rolled up in a single turn as shown in Fig. 7. This also applies in the case of the second main body 19'. The end faces shown in Fig. 6 provide the required blocking of the first flow distribution channels and second flow distribution channels in the case of the first main body 3', to obtain the first/second end face radial inner/outer
circumferentially extending bands. This also applies for the second main body 19'. For example, at one end face a radially inner half of a channel may be closed and the radially outer half may be open, while on the opposite side this is reversed, i.e. the inner half is left open and the outer half is closed. This may for example be obtained by two identical end faces, with the one end face being rotated the width of one flow distribution channel relative to the other end face.
The inventive concept has mainly been described above with reference to a few examples. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the inventive concept, as defined by the appended claims.

Claims

CLAIMS l. A coaxial flow distribution device (l; l') comprising: a first main body (3) having a first end face (3a) and a second end face (3b) at an opposite end of the first main body (3) with respect to the first end face (3a), wherein the first main body (3) is provided with a plurality of first flow distribution channels (5a; 5a') and a plurality of second flow distribution channels (9a; 9a') separated from the first flow distribution channels (5a; 5a'), the first flow distribution channels (5a; 5a') and the second flow distribution channels (9a; 9b') extending from the first end face (3a) to the second end face (3b), wherein at the first end face (3a) a first mouth (5b) of each first flow distribution channel (5a; 5a') is provided one after the other in the
circumferential direction along a first end face radial outer circumferentially extending band (7), and at the second end face (3b) a second mouth (5c) of each first flow distribution channel (5a; 5a') is provided one after the other in the circumferential direction along a second end face radial inner
circumferentially extending band (15), wherein at the first end face (3a) a third mouth (9b) of each second flow distribution channel (9a; 9a') is provided one after the other in the
circumferential direction along a first end face radial inner circumferentially extending band (11) provided radially inwards of the first end face radial outer circumferentially extending band (7), and at the second end face (3b) a fourth mouth (9c) of each second flow distribution channel (9a) is provided one after the other in the circumferential direction along a second end face radial outer circumferentially extending band (17) provided radially outwards of the second end face radially inner circumferentially extending band (15), and wherein the first main body (3) has a circumferential wall forming a radial outer wall of the first flow distribution channels (5a; 5a') and the second flow distribution channels (9a; 9a') between the first end face (3a) and the second end face (3b).
2. The coaxial flow distribution device (1; 1') as claimed in claim 1, wherein the first main body (3) has a cylindrical body portion (4) extending between the first end face (3a) and the second end face (3b).
3. The coaxial flow distribution device (1; 1') as claimed in claim 1 or 2, wherein each of the first end face radial inner circumferentially extending band (11) and the second end face radial inner circumferentially extending band (15) is funnel-shaped extending in towards the cylindrical body portion (4).
4. The coaxial flow distribution device (1; 1') as claimed in any of the preceding claims, wherein each first flow distribution channel (5a; 5a') is closed along the first end face inner circumferentially extending band (11), and along the second end face outer circumferentially extending band (17).
5. The coaxial flow distribution device (1; 1') as claimed in any of the preceding claims, wherein each second flow distribution channel (9a; 9a') is closed along the first end face outer circumferentially extending band (7), and along the second end face inner circumferentially extending band (15).
6. The coaxial flow distribution device (ι') as claimed in any of the preceding claims, wherein each first flow distribution channel 5a') has a central axis which is parallel with the central longitudinal axis of the first main body along (3') the entire length of the first flow distribution channel (5a').
7. The coaxial flow distribution device (ι') as claimed in any of the preceding claims, wherein each first flow distribution channel (5a') is undulating in a longitudinal direction of the first main body (3').
8. The coaxial flow distribution device (ι') as claimed in any of the preceding claims, wherein each second flow distribution channel (9a') has a central axis which is parallel with the central longitudinal axis of the first main body (3') along the entire length of the second flow distribution channel (9a').
9. The coaxial flow distribution device (ι') as claimed in any of the preceding claims, wherein each second flow distribution channel (9a') is undulating in a longitudinal direction of the first main body (3').
10. The coaxial flow distribution device (1) as claimed in any of the preceding claims, comprising a first flow device (29a) configured to control fluid flow at the first end face (3a) and a second flow device (29b) configured to control fluid flow at the second end face (3b).
11. The coaxial flow distribution device (1) as claimed in claim 10, comprising a first motor configured to drive the first flow device (29a) and the second flow device (29b).
12 The coaxial flow distribution device (1) as claimed in claim 10, comprising a first motor configured to drive the first flow device (29a) and a second motor configured to drive the second flow device (29b).
13. The coaxial flow distribution device (1) as claimed in any of the preceding claims, comprising: an elongated second main body (19; 19') having a third end face (19a) and a fourth end face (19b) at an opposite end of the second main body (19) with respect to the third end face (19a), wherein the second main body (19) is provided with a plurality of third flow distribution channels (21a) and a plurality of fourth flow distribution channels (23a) separated from the third flow distribution channels (21a), the third flow distribution channels (21a) and the fourth flow distribution channels (23a) extending from the third end face (19a) to the fourth end face (19b), wherein at the third end face (19a) a fifth mouth (21b) of each third flow distribution channel (21a) is provided one after the other in the
circumferential direction along a third end face radial outer circumferentially extending band (20), and at the fourth end face (19b) a sixth mouth of each third flow distribution channel (21a) is provided one after the other in the circumferential direction along a fourth end face radial inner
circumferentially extending band, wherein at the third end face (19a) a seventh mouth (23b) of each fourth flow distribution channel (23a) is provided one after the other in the circumferential direction along a third end face radial inner circumferentially extending band (25) provided radially inwards of the third end face radial outer circumferentially extending band (20), and at the fourth end face (19b) an eighth mouth (23c) of each fourth flow distribution channel (23a) is provided one after the other in the circumferential direction along a fourth end face radial outer circumferentially extending band provided radially outwards of the fourth end face radially inner circumferentially extending band, and wherein the second main body (19; 19') has a circumferential wall forming a radial outer wall of the third flow distribution channels (21a) and the fourth flow distribution channels (23a) between the third end face (19a) and the fourth end face (19b), wherein the second main body (19; 19') is configured to be arranged coaxially with the first main body (3), with the second end face (3b) of the first main body (3) arranged adjacent to the third end face (19a) of the second main body (19).
14. The coaxial flow distribution device (1) as claimed in claim 13, wherein each third flow distribution channel (21a) is closed along the third end face inner circumferentially extending band (25), and along the fourth end face outer circumferentially extending band, and wherein each fourth flow distribution channel (23a) is closed along the third end face outer circumferentially extending band (20), and along the fourth end face inner circumferentially extending band.
EP18749602.1A 2017-07-21 2018-07-20 Coaxial flow distribution device Withdrawn EP3638970A1 (en)

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SE1750952 2017-07-21
PCT/SE2018/050772 WO2019017831A1 (en) 2017-07-21 2018-07-20 Coaxial flow distribution device

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DE202020005950U1 (en) 2020-03-20 2023-08-04 Viessmann Climate Solutions Se exchanger device
EP3882552B1 (en) 2020-03-20 2023-08-23 Viessmann Climate Solutions SE Exchanger apparatus

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FR2647198B1 (en) * 1989-05-22 1991-07-19 Packinox Sa PLATE CONDUIT HEAT EXCHANGER
DE102005035712A1 (en) * 2005-07-27 2007-02-01 Bachmaier, Josef Method and/or construction for manufacture of ventilation unit with heat recuperation has passage of heat exchanger arranged between inner wall of outer tube and outer wall of inner tube, with fans and motors in inner tube
DE102006051903A1 (en) * 2005-09-23 2008-05-08 Josef Bachmaier Coiled heat exchanger for e.g. residential building, has channels following one after other, and feeding equipment such as radial ventilators, pumps or feed membranes, attached and/or integrated in exchanger
DE202010008955U1 (en) * 2010-11-04 2012-02-06 Akg-Thermotechnik Gmbh & Co. Kg Counterflow heat exchanger
CZ303626B6 (en) * 2011-09-20 2013-01-16 2 Vv S. R. O. Countercurrent cylindrical recuperative heat-exchange apparatus with multiple-threaded helically wound heat transfer surfaces intended particularly for ventilation installations
LT3234489T (en) * 2014-12-18 2020-09-25 Zehnder Group International Ag Heat exchanger and air conditioning apparatus therewith
ES2935298T3 (en) * 2015-03-17 2023-03-03 Zehnder Group Int Ag Interchange element for passenger cabin, as well as passenger cabin equipped with said interchange element

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