EP2487292A1 - Caisse de tête pour une machine destinée à la fabrication d'une bande de matière fibreuse - Google Patents

Caisse de tête pour une machine destinée à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP2487292A1
EP2487292A1 EP11188015A EP11188015A EP2487292A1 EP 2487292 A1 EP2487292 A1 EP 2487292A1 EP 11188015 A EP11188015 A EP 11188015A EP 11188015 A EP11188015 A EP 11188015A EP 2487292 A1 EP2487292 A1 EP 2487292A1
Authority
EP
European Patent Office
Prior art keywords
fluid
distributor
line
partial fluid
partial
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Withdrawn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
EP11188015A
Other languages
German (de)
English (en)
Inventor
Wolfgang Ruf
Konstantin Fenkl
Markus Häußler
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2487292A1 publication Critical patent/EP2487292A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a distributor for at least two in a headbox of a machine for producing a fibrous web, in particular paper, cardboard or packaging paper web from at least one pulp suspension, preferably adjacently arranged means for preferably controllable metered addition of a fluid in partial fluid streams in the at least one pulp suspension, comprising a distributor body with an inflow line having an inflow cross-sectional area for the fluid and with at least two outflow lines for the fluid outgoing from the inflow line and each having an outflow cross-sectional area for two fluid substreams.
  • Such a distributor for dividing a liquid flow containing fibers is, for example, from the document EP 0 941 439 B1 known.
  • the illustrated manifold has a body that defines a generally Y-shaped flow channel having an inflow channel and two arm flow channels parallel to each other and formed from a casting alloy.
  • a variety of these manifolds are used in the wet end of a papermaking machine.
  • a dilute water-regulated headbox is provided in the wet end, with a single manifold connected between a hose carrying a dilution medium and a control valve and a first control channel and means and a second control channel or means.
  • the means for preferably regulatable / controllable metering of a fluid in partial fluid streams into the at least one pulp suspension are also referred to in professional circles as metering elements, metering blades or injectors.
  • the distribution of the fluid flow supplied to the distributor should be carried out in partial fluid streams to at least two means with as little additional pressure loss as possible.
  • the inflow cross-sectional area of the inflow line for the fluid and the sum of Abströmqueritess vom the discharge lines for the fluid streams a cross-sectional area ratio in the range of 0.2 to 5, preferably from 0.3 to 2 , in particular from 0.5 to 1.5, and that the respective discharge line for a partial fluid flow is designed such that a pressure loss generated in it in the partial fluid flow by at least 20%, preferably by at least 50%, greater than the dynamic pressure in the fluid formed in the inflow conduit for the fluid.
  • the cross-sectional area ratio according to the invention of inflow cross-sectional area of the inflow line for the fluid and sum of the outflow cross-sectional areas of the inflow lines for the fluid substreams contributes significantly to an optimally optimal, that is uniform, distribution of the fluid flow in the distributor fluid streams into at least two means continuously and reliably.
  • the pressure loss in the partial fluid flow generated in the respective discharge line for a partial fluid flow ensures the distribution of the fluid flow supplied to the distributor in partial fluid streams to at least two means with as little additional pressure loss as possible.
  • the distributor according to the invention can have more than two outflow lines for the partial fluid streams, that is, for example, three or four outflow lines for the partial fluid streams. In the exemplary case of three outflow lines for the fluid sub-streams, these may be part of a three-part.
  • the discharge line for a partial fluid flow is preferably designed such that the pressure loss in the fluid partial flow generated in it is in the range of 0.01 to 2 bar, preferably from 0.01 to 0.4 bar. As a result, a homogenization of the partial fluid flow is promoted.
  • the inflow line for the fluid preferably has a diameter of 10 to 80 mm, preferably 15 to 50 mm. These diameter ranges allow sufficient fluid flow rate for safe operation of the distributor for at least two in a headbox of a machine for producing a fibrous web, in particular paper, board or packaging paper web, from at least one pulp suspension, preferably arranged adjacent Means for preferably controllable metering of a fluid in partial fluid streams into the at least one pulp suspension,
  • the outflow line for a partial fluid flow preferably at least one flow restricting and a sudden flow expansion causing and preferably arranged in the distributor body throttle for generating the pressure loss in the partial fluid flow is provided.
  • the entirety of the throttles in turn has a favorable effect on the most optimal, that is uniform distribution of the fluid flow supplied to the distributor in partial fluid streams to at least two means.
  • the discharge line for a partial fluid flow arranged in the distributor body is preferably extended with a discharge line for the partial fluid flow and in the discharge line for a partial fluid flow is preferably provided at least one flow constriction and an abrupt flow extension causing the pressure loss in the partial fluid flow.
  • This embodiment in turn, has a favorable effect on the most optimal, that is to say uniform distribution of the fluid flow supplied to the distributor in partial fluid streams to at least two means.
  • the throttle preferably comprises at least one preferably exchangeable throttle element, in particular a bushing, a ring or an insert.
  • a throttle element in particular a bushing, a ring or an insert.
  • At least one static mixer may also be provided in the outflow line for a partial fluid flow in order to generate the pressure loss in the partial fluid flow, wherein the static mixer preferably comprises fin-like guide elements which are located in the partial fluid flow.
  • the discharge line for a partial fluid flow can alternatively or additionally be dimensioned such that the pressure loss generated in it is generated due to fluid friction occurring at an increased flow velocity of the partial fluid flow at the pipe wall of the discharge line.
  • the partial fluid flow is thus passed through a small cross section at a high speed level.
  • the center lines of the discharge lines for the fluid partial streams initially preferably have a distributor angle in the range from 5 to 180 °, preferably from 10 to 90 °, in particular from 10 to 45 °, and the center line of the inflow line for the fluid is preferably bisecting and mutually.
  • the respective outflow line for a partial fluid flow preferably has a segmented, in particular kinked or curved course with at least two outflow line areas. This allows a particularly compact and reduced volume design of the manifold.
  • center lines of the exit-side discharge line regions of the discharge lines for the fluid sub-streams and the center line of the inflow line for the fluid preferably run parallel or approximately parallel to one another.
  • the center lines of all lines are preferably in one plane, so that in turn a particularly compact and reduced-volume construction of the distributor can be realized.
  • the inflow line for the fluid preferably has at its end a stowage surface arranged in the distributor, which is normal or approximately normal to the center line of the inflow line for the fluid and whose web width at each point is ⁇ 1 mm, preferably ⁇ 5 mm.
  • the respective means for preferably controllable metered addition of the fluid in partial fluid streams into the at least one pulp suspension preferably comprises a metering blade.
  • the fluid preferably consists at least of water, in particular white water or clear water, of at least one pulp suspension whose concentration differs from the average concentration of the at least one fed into the headbox pulp suspension, or of at least one pulp suspension.
  • the distributor according to the invention is also particularly suitable for use in a headbox for a machine for producing a fibrous web, in particular paper, board or packaging paper web, from at least one fibrous stock suspension.
  • This headbox comprises a feed device feeding the at least one pulp suspension, a downstream and a plurality of channels arranged in rows and in columns distribution well plate, a downstream lying, across the width of the headbox extending intermediate channel with a plurality in the width direction of the headbox spaced from each other Means for preferably controllable metered addition of a fluid in partial fluid streams into the at least one pulp suspension, the individual means each having a plurality of each Zudosierkanalö réelle and at different levels emptying, connected to a common supply channel Zudosierkanäle, a downstream arranged turbulence generating means having a plurality of flow lines arranged in rows and columns, and a nozzle immediately adjacent to the turbulence generating means Gap containing headbox nozzle.
  • two spaced-apart and preferably adjacent arranged means for preferably controllable metered addition of a fluid in fluid streams in the at least one pulp suspension medium or directly connected to a distributor according to the invention.
  • a machine for producing a fibrous web in particular paper, board or packaging paper web, from at least one pulp suspension preferably with at least one headbox just described and / or equipped with at least one distributor according to the invention.
  • FIG. 1 shows a vertical and schematic longitudinal sectional view of an exemplary and preferred embodiment of a headbox 1 for a machine 100 for producing a fibrous web 3 from a pulp suspension 2 (arrow).
  • the illustrated headbox 1 can of course also be designed as a multilayer headbox, which uses at least two different pulp suspensions for producing the fibrous web 3.
  • the fibrous web 3 may in particular be a paper, board or tissue web.
  • the headbox 1 has a feeding device 4 which feeds a pulp suspension 2 (arrow), for example in the embodiment of a transverse distributor tube 5 or a round distributor (not illustrated) with a plurality of tubes.
  • the feeder 4 is followed downstream by a Verteilrohrlochplatte 6, which has a plurality of arranged in rows Z and in columns S channels 7.
  • Dosierhistern 9.1 for preferably regulated / controllable metered addition of a fluid 10th (Arrow) is provided in partial fluid streams 10.T (arrows) in the pulp suspension 2 (arrow).
  • the individual means 9 for preferably controllable metered addition in each case comprises a plurality of metering channels 11 having a respective metering channel opening and opening at different heights and connected to a common supply channel 12.
  • a turbulence generating means 13 Downstream of the intermediate channel 8 is a turbulence generating means 13 having a plurality of flow channels 14 arranged in rows Z and in columns S.
  • the pulp suspension becomes 2 (arrow) in the turbulence generating means 13 divided into pulp suspension sub-streams and recombined after exiting the turbulence generating means in a machine-width chamber 15 in the form of a nozzle gap 17 having headbox nozzle 16 to allow the formation of a machine-width fibrous web 3.
  • the flow channels 14 are preferably formed in a known manner as thin-walled turbulence tubes and / or turbulence tube inserts with at least partially constant, at least partially diverging, at least partially converging and / or discontinuous cross-sectional areas.
  • the headbox 16 at least one, the expert well known and not explicitly shown separating element, in particular a blade be arranged. If a plurality of separating elements, in particular lamellae, are arranged in the headbox nozzle 16, they can have different lengths and possibly also different properties, such as surface contours and the like.
  • the headbox 16 may be provided on the outlet side at least one side with a dashed line indicated aperture 18.
  • two in the headbox 1 for the machine 100 for producing a fibrous web 3, in particular paper, cardboard or packaging paper web, from at least one pulp suspension 2 (arrow), preferably adjacently arranged means 9 for preferably rule / controllable Metering of a fluid 10 (arrow) in partial fluid streams 10.T (arrows) in the pulp suspension 2 are medium or directly connected to a manifold 19 only schematically indicated.
  • the individual distributor 19 comprises a distributor body 20 with an inflow line 21 having an inflow cross-sectional area for the fluid 10 (arrow) and with two from the inflow line 21 for the fluid 10 (arrow) preferably directly outgoing and in each case one outflow cross-sectional area having discharge lines 22.1, 22.2 (dashed line) for two partial fluid streams 10.T (arrows) (see. Figures 3 and 4 ).
  • an actuator 23 is arranged for the purpose of control / regulation of the fluid streams 10T (arrows) emerging from the respective means 9.
  • the merely indicated actuator 23 preferably comprises an adjustable, in particular a controllable / controllable throttle known type and known operation.
  • FIG. 2 shows a horizontal, partial and schematic longitudinal section of the in the FIG. 1 Headbox 1 shown for a machine 100 for producing a fibrous web 3 from at least one pulp suspension 2.
  • the headbox 1 only partially shown has generally a mirror-symmetrical structure to the longitudinal centerline LML (double arrow).
  • the means 9 for preferably controllable metered addition of the fluid 10 in partial fluid streams 10T (arrows) into the pulp suspension 2 is designed as a metering blade 9.1 and comprises a respective metering channel opening 11.1 and opening at different heights, with a common supply channel 12 associated Zudosierkanäle 11.
  • the respective Zudosierkanalö Stamm 11.1 is centrally or approximately centrally disposed between two adjacent columns S flow channels 14 of the turbulence generating means 13, so that the emerging from the respective means 9 for preferably regulated / controllable metering fluid partial flows 10.T (arrows) also centrally or approximately centrally between two adjacent columns S on flow channels 14 of the Turbulence generating means 13 impinge on the turbulence generating means 13.
  • the metering channels 11 of the means 9 for preferably controllable metering, which discharge at different heights, are arranged at equal intervals, and the metering channel 11 of the means 9 for preferably controllable metering connected to the common supply channel 12 has a circular cross-sectional area with a diameter of 2 to 10 mm, preferably from 4 to 6 mm.
  • the common supply channel 12 of the means 9 for preferably controllable metered addition has a circular cross-sectional area with a diameter of 6 to 20 mm, preferably from 10 to 15 mm.
  • the means 9, preferably designed as a metering blade 9.1, for preferably controllable metering has a length 9.L in the range of 60 to 350 mm, preferably 100 to 250 mm, and a height 9 depending on the height of the intermediate chamber of the headbox 1. H (see also FIG. 1 ) in the range of 50 to 300 mm, preferably 75 to 250 mm.
  • the means 9 for preferably controllable metered addition have a preferably equal pitch T in the width direction of the headbox 1 in the range of 10 to 100 mm, preferably 25, 33, 50 or 66 mm.
  • the means 9 in the embodiment of a metering blade 9.1 is in the document DE10 2008 054 898 A1 described and shown.
  • the relevant disclosure content is hereby made the subject of the present description.
  • the agent can also be embodied as a perforated plate known to the person skilled in the art or a distribution well plate known to the person skilled in the art.
  • two in the headbox 1 for the machine 100 for producing a fibrous web from at least one pulp suspension 2 (arrow), preferably adjacent arranged means 9 for preferably rule / controllable Metering of a fluid 10 (arrow) in partial fluid streams 10.T (arrows) in the pulp suspension 2 medium or directly connected to a manifold 19 only schematically indicated.
  • the individual distributor 19 comprises a distributor body 20 with an inflow line 21 having an inflow cross-sectional area for the fluid 10 (arrow) and with at least two outflow lines 22.1, 22.2 (FIG. 2) preferably having a direct outflow from the inflow line 21 for the fluid 10 (arrow) and having a respective outflow cross-sectional area. dashed line illustration) for two partial fluid streams 10.T (arrows) (cf. Figures 3 and 4 ).
  • FIGS. 3 and 4 show schematic longitudinal sectional views of two preferred embodiments of distributors 19 for two in a headbox 1 of a machine 100 for producing a fibrous web, in particular paper, cardboard or packaging paper web, at least one pulp suspension 2, preferably adjacent arranged means 9 for preferably controllable / controllable Metering of a fluid 10 (arrow) in partial fluid streams 10.T (arrows) into the at least one pulp suspension 2.
  • the distributor 19 illustrated in each case comprises a distributor body 20 with an inflow line 21 having an inflow cross-sectional area 21.Q for the fluid 10 (arrow) and with two from the inflow line 21 for the fluid 10 (arrow) preferably directly outgoing and in each case one outflow cross-sectional area 22.1.Q , 22.2.Q having discharge lines 22.1, 22.2 for two partial fluid streams 10.T (arrows).
  • the inflow cross-sectional area 21.Q of the inflow line 21 for the fluid 10 (arrow) and the sum of the outflow cross-sectional areas 22.1.Q, 22.2.Q of the outflow lines 22.1, 22.2 for the partial fluid streams 10.T (arrows) have a cross-sectional area ratio QV in the range of 0, 2 to 5, preferably from 0.3 to 2, in particular from 0.5 to 1.5, on.
  • the respective outflow line 22.1, 22.2 for a partial fluid flow 10.T (arrow) is designed such that a pressure loss dp generated in it in the partial fluid flow 10.T (arrow) is greater than at least 20%, preferably at least 50% the in the inflow line 21 for the fluid 10 (arrow) formed dynamic pressure p dyn in the fluid 10 (arrow).
  • the respective outflow line 22.1, 22.2 for a partial fluid flow 10.T is also designed such that the pressure loss dp generated in it in the partial fluid flow 10.T (arrow) in the range of 0.01 to 2 bar, preferably from 0 , 01 to 0.4 bar.
  • the respective inflow line 21 for the fluid 10 (arrow) has a diameter 21.D of 10 to 80 mm, preferably 15 to 50 mm.
  • the respective arranged in the distributor body 20 discharge line 22.1, 22.2 for a partial fluid flow 10.T (arrow) with a Abströmtechnischstrum 25.1, 25.2 for the partial fluid flow 10.T (arrow) extended.
  • the respective Abström effetstrum 25.1, 25.2 for a partial fluid flow 10.T (arrow) is provided at least one of a flow constriction and a sudden flow expansion causing throttle 24 for generating the pressure loss dp in the partial fluid flow 10.T (arrow).
  • the single throttle 24 includes in a known manner at least one preferably replaceable throttle element 24.1, in particular a socket, a ring or an insert.
  • At least one static mixer may also be provided in the outflow line for a partial fluid flow in order to generate the pressure loss in the partial fluid flow, wherein the static mixer preferably comprises fin-like guide elements which are located in the partial fluid flow.
  • the outflow line for a partial fluid flow can be dimensioned such that the pressure loss generated in it is generated due to fluid friction occurring on the pipe wall of the outflow line.
  • center lines 22.1.M, 22.2.M of the two outflow lines 22.1, 22.2 for the partial fluid streams 10.T initially have a distribution angle W in the range from 5 to 180 °, preferably from 10 to 90 °, in particular from 10 to 45 °, wherein the center line 21.M of the inflow line 21 for the fluid 10 (arrow) is bisecting and mutually bisecting.
  • the respective outflow line 22.1, 22.2 for a partial fluid flow 10.T (arrow) has a segmented, in particular kinked or curved course with at least two outflow line areas A, C.
  • center lines 22.1.M, 22.2.M of the two exit-side discharge line regions C of the two outflow lines 22.1, 22.2 for the partial fluid streams 10.T (arrows) and the center line 21.M of the inflow line 21 for the fluid 10 (arrow) run parallel or approximately parallel to each other.
  • the center lines 21.M, 22.1.M, 22.2.M of all lines 21, 22.1, 22.2 are preferably in a plane E.
  • the inflow line 21 for the fluid 10 (arrow) has at its end a stowage surface 26 arranged in the distributor 19, which is aligned normal or approximately normal to the center line 21.M of the inflow line 21 for the fluid 10 (arrow) and its web width 26 B is ⁇ 1 mm at each point, preferably ⁇ 5 mm.
  • the characteristics of in the FIGS. 1 to 4 described embodiments of the respective headbox 1 can also be at least partially combined with one another for the expert in a suitable manner.
  • the respective means 9 for preferably controllable metered addition of the fluid 10 (arrow) into partial fluid streams 10T (arrows) into the at least one pulp suspension 2 preferably comprises a metering blade 9.1.
  • the headbox 1 of the FIGS. 1 to 4 flowing through fluid 10 consists at least of water, in particular white water or clear water, or from at least one pulp suspension whose concentration differs from the average concentration of at least one in the headbox 1 flowing pulp suspension 2.
  • the distributor 19 according to the invention is also particularly suitable for use in a headbox 1 for a machine 100 for producing a fibrous web 2, in particular paper, board or packaging paper web, from at least one fibrous stock suspension 3.
  • Such a headbox 1 comprises a feed device 4 which feeds the at least one pulp suspension 2, a distributor tube plate 6, which is located downstream and has a multiplicity of channels 7 arranged in rows Z and in columns S, a width B (arrow) lying downstream thereof.
  • a headbox 1 extending intermediate channel 8 having a plurality of spaced in the width direction of the headbox 1 means 9, 9.1 for the preferably controllable metered addition of a fluid 10 (arrow) in partial fluid streams 10T (arrows) into the at least one pulp suspension 2,
  • the individual means 9, 9.1 each having a respective metering channel opening 11.1 and at different heights opening, connected to a common supply channel 12 Zudosierkanäle 11 includes a downstream arranged turbulence generating means 13 having a plurality of arranged in rows Z and in columns S flow channels 14, and the turbulence generating means 13 immediately adjoining and a nozzle gap 17 having headbox 16th
  • Such a headbox 1 for a machine 100 for producing a fibrous web 2, in particular paper, cardboard or packaging paper web, from at least one pulp suspension 3 is for example in the FIG. 1 shown in a vertical and schematic longitudinal sectional view.
  • the distributor 19 according to the invention and / or a headbox 1 with a distributor 19 according to the invention is also particularly suitable for use in a machine 100 for producing a fibrous web 3, in particular paper, board or packaging paper web, from at least one fibrous stock suspension 2.
  • Such a machine 100 for producing a fibrous web 2, in particular paper, cardboard or packaging paper web, from at least one pulp suspension 3 is for example in the FIG. 1 at least partially shown in a vertical and schematic longitudinal sectional view.
  • a distributor is provided by the invention, by means of which the most optimal, that is even distribution of the manifold supplied fluid flow is ensured in fluid streams to at least two means continuously and reliably.
  • the distribution of the fluid flow supplied to the distributor takes place in partial fluid streams to at least two means with as little additional pressure loss as possible.

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EP11188015A 2011-02-09 2011-11-07 Caisse de tête pour une machine destinée à la fabrication d'une bande de matière fibreuse Withdrawn EP2487292A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110003849 DE102011003849A1 (de) 2011-02-09 2011-02-09 Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn

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EP2487292A1 true EP2487292A1 (fr) 2012-08-15

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EP (1) EP2487292A1 (fr)
CN (1) CN202786929U (fr)
DE (1) DE102011003849A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104514938A (zh) * 2014-11-28 2015-04-15 航宇救生装备有限公司 一种四通分流装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015014529B3 (de) * 2015-11-11 2016-09-29 Ac Aircontrols Gmbh Vorrichtung zum Mischen und Dosieren von zumindest zwei Gasen
CN105648827B (zh) * 2016-03-11 2017-07-11 韦周全 一种干法造纸装置及方法
BR112022022805A2 (pt) * 2020-05-29 2023-01-17 Kimberly Clark Co Caixa de entrada para fabricação de um substrato

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941439B1 (fr) 1996-12-03 2003-01-15 Beloit Technologies, Inc. Dispositif de separation de debit destine a un systeme de dilution de pate servant a controler le profil d'une bande continue
WO2006069651A1 (fr) * 2004-12-23 2006-07-06 Autefa Automation Gmbh Distributeur de voile et procede de guidage d'un poil
DE102008054898A1 (de) 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941439B1 (fr) 1996-12-03 2003-01-15 Beloit Technologies, Inc. Dispositif de separation de debit destine a un systeme de dilution de pate servant a controler le profil d'une bande continue
WO2006069651A1 (fr) * 2004-12-23 2006-07-06 Autefa Automation Gmbh Distributeur de voile et procede de guidage d'un poil
DE102008054898A1 (de) 2008-12-18 2010-06-24 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104514938A (zh) * 2014-11-28 2015-04-15 航宇救生装备有限公司 一种四通分流装置

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CN202786929U (zh) 2013-03-13

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