EP0303850A2 - Dispositif de mélange d'air - Google Patents

Dispositif de mélange d'air Download PDF

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Publication number
EP0303850A2
EP0303850A2 EP88111824A EP88111824A EP0303850A2 EP 0303850 A2 EP0303850 A2 EP 0303850A2 EP 88111824 A EP88111824 A EP 88111824A EP 88111824 A EP88111824 A EP 88111824A EP 0303850 A2 EP0303850 A2 EP 0303850A2
Authority
EP
European Patent Office
Prior art keywords
air
mixing device
air mixing
inlet
section
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.)
Granted
Application number
EP88111824A
Other languages
German (de)
English (en)
Other versions
EP0303850A3 (en
EP0303850B1 (fr
Inventor
Manfred Stellamans
Emil Falk
Helmut Buss
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.)
Hansa Ventilatoren und Maschinenbau Neumann GmbH and Co KG
Original Assignee
Hansa Ventilatoren und Maschinenbau Neumann GmbH and Co KG
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 Hansa Ventilatoren und Maschinenbau Neumann GmbH and Co KG filed Critical Hansa Ventilatoren und Maschinenbau Neumann GmbH and Co KG
Priority to AT88111824T priority Critical patent/ATE68050T1/de
Publication of EP0303850A2 publication Critical patent/EP0303850A2/fr
Publication of EP0303850A3 publication Critical patent/EP0303850A3/de
Application granted granted Critical
Publication of EP0303850B1 publication Critical patent/EP0303850B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24F13/04—Air-mixing units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B01F25/31322—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices used simultaneously

Definitions

  • the invention relates to an air mixing device of the type specified in the preamble of claim 1.
  • an air mixing device which consists of an installation part for a mixing chamber Air conditioning system, which is provided with an inlet for two partial flows and an outlet for a main flow, and in which one or more hollow bodies are arranged, which connect to one of the inlets, pass through the partial flow of the other inlet, and their outlet cross section exclusively is provided on the side facing the outlet for the main flow.
  • the outlet cross section lies in a surface that runs at an acute angle to the longitudinal axis of the hollow body.
  • Mixing chambers of this type are usually used in ventilation and air-conditioning systems for mixing outside air and recirculated air, in particular at low outside air temperatures, the temperature level of the outside air flow is very different from that of the recirculating air flow. If, for example, the cold outside air enters the mixing chamber from above while the circulating air is fed to the mixing chamber from one end, the strong temperature differences between the outside occur Air and circulating air in the upper area of the air outlet cross section of the mixing chamber have very low temperatures, while high temperatures are reached in the lower area due to the more effective warm circulating air there.
  • This temperature gradient within the mixed air or main flow leaving the mixing chamber leads to the risk of downstream system parts of the air conditioning system, for example a heat exchanger or preheater, which freezes in the area where the cold outside air predominates in the main flow, so that the risk of the downstream process being destroyed Heat exchanger or preheater, but at least there is a risk of malfunction of the ventilation and air conditioning system.
  • a heat exchanger or preheater which freezes in the area where the cold outside air predominates in the main flow, so that the risk of the downstream process being destroyed Heat exchanger or preheater, but at least there is a risk of malfunction of the ventilation and air conditioning system.
  • the present invention has for its object to provide a mixing device of the type specified in the preamble of claim 1, which ensures optimal mixing of the partial air flows over a short flow path and ensures that the mixed air flow leaving the mixing chamber distributes no or only slight temperature differences over its cross section with differently tempered partial air flows.
  • the invention is based on the finding that, as a result of the openings in the channel walls of the air mixing device, which act like nozzles because of the different pressure conditions within the mixing chamber, parts of the air streams are pressed through the openings and get into the respectively adjacent channel, so that the mixing of the Partial air flows essentially within the channels and only a slight residual mixing occurs at the outlet edge of the air mixing device.
  • Different pressure ratios within the mixing chamber are generally given by supplying different amounts of air to one or the other inlet of the mixing chamber, whereby the flow of air can be regulated by built-in components such as louvre flaps, or they can be brought about by special measures on the air mixing device .
  • optimal mixing of the partial air flows takes place in the shortest possible way within the mixing device, so that only slight pressure losses occur and the dimensions of the mixing chamber can be kept small.
  • the optimal mixing of the partial air flows also ensures any choice of the cross-sectional shape of the channels or channel walls, so that the designer with respect to the location of the air inlets and Choose air outlet freely and thus determine an optimal location.
  • the optimal mixing of the partial air flows ensures that no condensation can occur on the plates within the mixing device, since even in the case of large temperature differences as a result of the optimal enforcement of the plates there is no risk of the plates cooling down, even in some areas.
  • the openings of the duct walls can be circular or slit-shaped, but any other cross-sectional shapes of the openings, such as oval or square openings, can also be selected, which under certain circumstances still support mixing of the partial air streams through stronger eddy formation.
  • Another advantageous embodiment of the solution according to the invention is characterized in that the alignment of the slot-shaped openings is mutually offset by 90 °.
  • the diameter of the openings can vary, so that an adaptation to the pressure conditions inside the mixing device is possible.
  • the ducts consist of narrow, box-shaped shafts with duct walls arranged parallel to one another, the ducts being alternately open or closed in the area of the air inlet cross sections, so that the relevant partial air flow is forced to flow into specific ducts.
  • the individual ducts in the area of the air inlet cross-sections can be covered by closed or perforated insert plates, so that the partial air flow in question flows in a smaller amount into the duct covered with a perforated insert plate than into the adjacent ducts.
  • the channels in the area of the air inlet cross sections of the air mixing device are alternately closed at one and the other inlet of the mixing chamber or covered and open with perforated or slotted inlet plates. It is thereby achieved that even with the same partial air flow rate, a pressure gradient promoting the mixing is formed between the individual, adjacent ducts, since one or the other partial air flow is stronger in one or the adjacent duct and thus as a result of the pressure difference caused thereby in the adjacent duct flows through the openings.
  • deflection projections are attached to the openings, which on the one hand lead to eddy formation and on the other hand forcefully divert parts of the partial air flows in the adjacent duct.
  • the deflection projections can either be arranged only on one side of the channel walls or alternately on one or the other side of the channel wall or can be pivoted in the openings.
  • a perforated or slotted outlet plate is provided, which leads to a somewhat increased pressure drop, but contributes to an increased mixing of the partial air flows.
  • Figure 1 shows a schematic, perspective view of part of a ventilation system with a mixing chamber 1, a heat exchanger or preheater 2 and a fan 3.
  • the mixing chamber 1 has two inlets 4, 5 through which two partial air flows A, U from not shown Flow channels are passed, the air volume flows being controllable by quantity-influencing built-in components such as, for example, louvre flaps 41, 51.
  • the partial air flows which here consist of an outside air flow A and a circulating air flow U, are fed to the mixing chamber 1 in the direction of the arrow at an angle of 90 °. Both air flows generally have a different temperature level, which is indicated in the exemplary embodiment shown by filled and open circles.
  • the type of supply of the partial air flows is arbitrary and is not based on the embodiment shown in FIG. 1 limits.
  • the partial air flow U can also be supplied to the mixing chamber 1 from the side or from below, or both partial air flows A, U from the side or from above and below.
  • the partial air flows A, U fed to the mixing chamber 1 are mixed in the mixing chamber 1 and leave the mixing chamber 1 via the air outlet cross section 63 as a mixed flow M, which is indicated by the crossed lines.
  • the mixed flow M leaves the mixing chamber 1 in the direction of one partial air flow U, but can also leave the mixing chamber 1 in the direction of the other partial air flow A, depending on the arrangement of the other parts of the ventilation and air conditioning system.
  • a plurality of flow channels 6 are provided in the mixing chamber 1 and are formed by channel walls 64.
  • the channel walls 64 consist of plates with openings 7 arranged parallel to one another and can optionally be provided with insert plates in the area of the air inlet cross sections 61, 62, as will be explained in more detail below.
  • FIG. 2 shows a perspective illustration of an air mixing device with channel walls 64 arranged parallel to one another to form narrow, box-shaped channels 6, whose air outlet cross section 63 is chamfered and can optionally be provided with a perforated or slotted outlet plate 67.
  • the partial air flows enter the air mixing device from above or from the front end, which is shown in FIG. 2 by the arrows.
  • the channels 6 are alternately covered by inlet plates 65, 66, so that the partial air flows are directed into every second channel according to the arrows shown.
  • the partial air flow passing through the air inlet cross-section 62 is let unhindered into the duct 6a, while the part-air flow passing through the air inlet cross-section 61 reaches the duct 6b unhindered.
  • parts of the individual partial air streams flow into the respectively adjacent duct and mix intensively with the other partial air stream.
  • the mixing effect is enhanced by the fact that usually the partial air flows have a different throughput, i.e. have a different amount of air per unit of time, which causes different pressures in the individual channels 6. These different dynamic and static air pressures have the effect that the openings 7 in the channel walls 64 act as nozzles through which the partial air flows are directed.
  • the inlet plates 65, 66 can either be designed as closed plates or perforated or slotted be so that a certain proportion of the respective partial air flow can also penetrate through the perforated or slotted inlet plate 65, 66 into the duct in question. However, since this proportion is small compared to that of the other partial air flow, the proportion of the other partial air flow in the duct in question predominates and, with its either greater or smaller dynamic air pressure, causes an intensive exchange with the other partial air flow.
  • FIG. 3 shows a variant of the embodiment of the air mixing device shown in FIG. 2, in which the individual channels 6 are alternately covered with inlet plates 65 in the area of one air inlet cross section 61, while the channels 6 are open in the area of the other air inlet cross section 62.
  • the partial air flow passing through the air inlet cross section 61 is conducted into the respective open channels, while the partial air flow passing through the air inlet cross section 62 is passed unhindered into all channels.
  • the inlet plates 65 can be completely closed or perforated or slotted, so that either the partial air flow in question is prevented from entering the channel in question or that it only enters the channel in question with a reduced amount.
  • a further variant can consist in that the inlet plates are closed in the area of one air inlet cross section, while those in the area of the other air inlet cross section are perforated or slotted.
  • FIG. 4 shows a cross section through a duct 6 with two duct walls 64 arranged parallel to one another. Through the openings 7 provided in the duct walls 64, parts of the respective partial air flow can penetrate into the duct 6 concerned and can, for example, penetrate into the duct 6 as indicated by the arrows mix into the drawing plane or out of the drawing plane other partial air flow.
  • One of the partial air streams reaches the relevant channel 6 via a perforated or slotted inlet plate 61.
  • FIG. 5 shows a top view or a cross section through part of a channel wall 64 with a plurality of circular openings 71
  • FIG. 6 shows top views of parts of channel walls 64 with differently oriented slots 72, 73.
  • the slots can be arranged either vertically (slots 72) or horizontally (slots 73) or - as shown in FIG. 6c - both horizontally and vertically and thus assume a configuration corresponding to FIG. 6c.
  • the openings 7 can optionally be provided with deflection projections 8 which intensify the mixing of the partial air flows.
  • deflection projections 8 can be designed like a gill and directed against the direction of flow of the relevant partial air flow.
  • the deflection projections 8 according to FIG. 8 can be arranged exclusively on one side of the channel wall or alternately on one or the other side of the channel wall according to FIG. 9.
  • Figure 10 shows a variant in which the deflection projections 91, 92 are arranged foldably in the openings and, depending on the strength of the respective partial air flow, open or close the opening 7 in question or ensure that corresponding air flow parts enter the relevant channel.
  • leading edges of the channel walls 64 in the area of the air inlet cross-sections 61, 62 can - as shown in FIG. 11 - be arbitrary and also consist, for example, of a flat leading edge 10a, a triangular leading edge 10b, a semicircular leading edge 10c or a trapezoidal leading edge 10d .
  • FIG. 12 shows various top views of individual channel walls or longitudinal sections through the air mixing device according to the invention. Due to the intensity of the air mixing within the air mixing device and the negligible importance of the air outlet edge, the cross-sectional shape of the air mixing device can be chosen almost arbitrarily. For example, the cross section of the air mixing device can be square or rectangular, the partial air streams entering the air mixing device offset by 90 ° to one another and the mixed air stream leaving the mixing device in the direction of one or the other partial air stream. ( Figure 12a)
  • the partial air streams can enter the mixing chamber and thus the mixing device via opposite inlets and can thus be directed towards one another, the resulting mixed stream being the mixers direction and thus can leave the mixing chamber up or down.
  • the partial air flows enter the mixing device offset by 90 ° to one another, while the mixed flow leaves the mixing device at an acute or obtuse angle with respect to one or the other partial air flow.
  • FIG. 12e shows a hexagonal cross section of the air mixing device or a longitudinal section of the duct walls, the partial air flows entering through two air inlet cross sections separated by an edge of the hexagon and the mixed air flow exiting through an edge which is likewise separated from the air inlet cross sections by a closed edge of the air mixing device.
  • FIG. 12f shows a cross section of the air mixing device in a triangular shape with corresponding partial air flows entering
  • FIG. 12 g shows a circular cross section of the air mixing device with partial air flows or mixed air flow directed according to the drawing.
  • FIG. 12h shows a trapezoidal cross section of the air mixing device, with partial air flows and a mixed air flow, which are directed in accordance with the arrows entered.
  • the mixing is optimal Partial air flows for the formation of a homogeneous mixed air flow are guaranteed, whereby turbulence can additionally be generated by deflection projections, which effectively reinforce the mixing effect.
  • the number of openings in the channel walls is arbitrary and can be selected depending on the operating conditions.
  • the embodiment of the invention is not limited to the preferred exemplary embodiment specified above. Rather, a number of variants are conceivable which make use of the solution shown even in the case of fundamentally different types.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP88111824A 1987-08-18 1988-07-22 Dispositif de mélange d'air Expired - Lifetime EP0303850B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88111824T ATE68050T1 (de) 1987-08-18 1988-07-22 Luftmischeinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8711340U DE8711340U1 (de) 1987-08-18 1987-08-18 Luftmischeinrichtung
DE8711340U 1987-08-18

Publications (3)

Publication Number Publication Date
EP0303850A2 true EP0303850A2 (fr) 1989-02-22
EP0303850A3 EP0303850A3 (en) 1990-05-30
EP0303850B1 EP0303850B1 (fr) 1991-10-02

Family

ID=6811267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111824A Expired - Lifetime EP0303850B1 (fr) 1987-08-18 1988-07-22 Dispositif de mélange d'air

Country Status (3)

Country Link
EP (1) EP0303850B1 (fr)
AT (1) ATE68050T1 (fr)
DE (2) DE8711340U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9214370U1 (de) * 1992-10-23 1993-02-11 "Schako" Metallwarenfabrik Ferdinand Schad KG Zweigniederlassung Kolbingen, 7201 Kolbingen Deckenauslaß
WO1994025805A1 (fr) * 1993-04-23 1994-11-10 ABB Fläkt Oy Section de melange pour l'air frais et l'air recycle dans un appareil de conditionnement d'air
DE19826990A1 (de) * 1998-06-18 1999-12-23 Behr Gmbh & Co Luftmischeinrichtung für eine Heizungs- oder Klimaanlage eines Kraftfahrzeuges
US20080251592A1 (en) * 2007-03-02 2008-10-16 Georg Baldauf Mixing device for aircraft air conditioning system
EP2405209A1 (fr) * 2010-07-06 2012-01-11 Synergie Protect Climatisation Dispositif d'admission et de mixage d'air pour pompe à chaleur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109101A1 (de) * 1991-03-20 1992-09-24 Turbon Tunzini Klimatechnik Einbau fuer mischkammern stroemungstechnischer anlagen
DE4329302A1 (de) * 1993-08-31 1995-03-02 Osman Dr Abousteit Verfahren zum Erzeugen eines Reaktionsgemisches aus wenigstens zwei Reaktionskomponenten und Mischkopf zur Durchführung des Verfahrens
DE19860240A1 (de) * 1998-12-24 2000-06-29 Ruhrgas Ag Vorrichtung zum Mischen zweier Fluidkomponenten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB612012A (en) * 1945-10-09 1948-11-08 Harry Stewart Wheller Improvements in mixing chamber for use in heating or cooling devices
US3911804A (en) * 1974-05-20 1975-10-14 William K Y Tao Air mixing device
DE2844046A1 (de) * 1978-10-10 1980-04-17 Kessler & Luch Gmbh Mischkammer fuer klimaanlagen
DE3207334A1 (de) * 1982-03-02 1983-09-15 Turbon-Tunzini Klimatechnik GmbH, 5060 Bergisch Gladbach Mischkammer fuer raumlufttechnische anlagen
DE3217803C2 (de) * 1982-05-12 1986-09-11 Turbon-Tunzini Klimatechnik GmbH, 5060 Bergisch Gladbach Einbauteil für eine Mischkammer einer raumlufttechnischen Anlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB612012A (en) * 1945-10-09 1948-11-08 Harry Stewart Wheller Improvements in mixing chamber for use in heating or cooling devices
US3911804A (en) * 1974-05-20 1975-10-14 William K Y Tao Air mixing device
DE2844046A1 (de) * 1978-10-10 1980-04-17 Kessler & Luch Gmbh Mischkammer fuer klimaanlagen
DE3207334A1 (de) * 1982-03-02 1983-09-15 Turbon-Tunzini Klimatechnik GmbH, 5060 Bergisch Gladbach Mischkammer fuer raumlufttechnische anlagen
DE3217803C2 (de) * 1982-05-12 1986-09-11 Turbon-Tunzini Klimatechnik GmbH, 5060 Bergisch Gladbach Einbauteil für eine Mischkammer einer raumlufttechnischen Anlage

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9214370U1 (de) * 1992-10-23 1993-02-11 "Schako" Metallwarenfabrik Ferdinand Schad KG Zweigniederlassung Kolbingen, 7201 Kolbingen Deckenauslaß
WO1994025805A1 (fr) * 1993-04-23 1994-11-10 ABB Fläkt Oy Section de melange pour l'air frais et l'air recycle dans un appareil de conditionnement d'air
US5632675A (en) * 1993-04-23 1997-05-27 Abb Flakt Oy Mixing section for supply air and return air in an air-conditioning apparatus
DE19826990A1 (de) * 1998-06-18 1999-12-23 Behr Gmbh & Co Luftmischeinrichtung für eine Heizungs- oder Klimaanlage eines Kraftfahrzeuges
DE19826990B4 (de) * 1998-06-18 2007-01-25 Behr Gmbh & Co. Kg Luftmischeinrichtung für eine Heizungs- oder Klimaanlage eines Kraftfahrzeuges
US20080251592A1 (en) * 2007-03-02 2008-10-16 Georg Baldauf Mixing device for aircraft air conditioning system
US8789766B2 (en) * 2007-03-02 2014-07-29 Liebherr-Aerospace Lindenberg Gmbh Mixing device for aircraft air conditioning system
EP2405209A1 (fr) * 2010-07-06 2012-01-11 Synergie Protect Climatisation Dispositif d'admission et de mixage d'air pour pompe à chaleur

Also Published As

Publication number Publication date
DE3865273D1 (de) 1991-11-07
EP0303850A3 (en) 1990-05-30
ATE68050T1 (de) 1991-10-15
EP0303850B1 (fr) 1991-10-02
DE8711340U1 (de) 1987-10-15

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