Classifications

• • 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

Definitions

• the invention relates to a device for mixing fluid mixing components with a flow channel, which has an inlet for the first mixing component, with at least one cylindrical mixing chamber which tangentially adjoins the flow channel and which is flow-resistant at the junction with the flow channel - is bound, wherein a leading edge directs a part of the first mixing component into the mixing chamber, and with a cylindrical axial channel opening axially into the mixing chamber.
• a mixing device is known from SU-A 1 034 790.
• the flow channel similarly as is also known from US Pat. No. 3,911,858, is designed in the form of a Venturi tube with a converging area, a diverging area and a transition area arranged between them. Adjacent to the transition area are two mixing chambers.
• the mixing component flowing into the flow channel flows against a leading edge, so that part of the component is deflected into the mixing chamber or chambers and a rapidly rotating vortex is generated in the mixing chamber.
• the channel opening axially into the mixing chamber leads the second mixing component into the "eye" of the vertebra, so that the two components are mixed violently. If two or more mixing chambers are present, the same or additional mixing components can be introduced into the associated axial channels.
• the degree of mixing of the components which can be achieved with the known mixing device is not sufficient.
• the object of the invention is therefore to create a mixing device with which the mixing of the components to be mixed is further improved.
• This object is achieved in the generic mixing device according to the invention in that a cylindrical prechamber is arranged coaxially in front of the axial channel and in that a feed channel for the second or the further mixing components opens tangentially into the prechamber.
• a vortex is already generated in the prechamber, so that the component to be added is already rotating when it enters the vortex rotating in the mixing chamber. This not only reduces the energy required for mixing, but also leads to an improved mixing effect.
• the mixing effect can be further improved, albeit with a certain loss of energy, if the component feed channel opens into the prechamber in such a way that a swirl is created in it, which is opposite to that in the associated mixing chamber.
• the prechamber and the axial channel are smoothly continuous with the same cross section.
• the ratio of the diameter of the prechamber to the diameter of the axial channel is 1.25 to 1.5.
• FIG. 1 shows a sectional view (section A - A of FIG. 2) of a mixing device according to the invention
• Figure 2 shows the section B - B of Figure 1
• FIG. 3 shows a sectional view (analogous to FIG. 2) of a mixing device, in the prechambers of which several feed channels each open.
• the mixing device shown in FIGS. 1 and 2 contains a housing 1, in which a flow channel 2 is formed in the form of a venturi tube.
• The. Connection spout 9 is used to supply a first mixing component.
• the housing 1 is closed by a cover 4, in which two channels 7 each opening axially into the mixing chambers 3 are formed. Each of these axial channels 7 is preceded by a prechamber 5, into each of which a feed channel 6 opens tangentially.
• the second or also a third mixing component is fed to the feed channels 6 via a connecting nozzle 11.
• the number of components to be mixed can be increased practically as desired in accordance with the exemplary embodiment in FIG. 3, where three feed channels 6 each open into the antechambers 5.
• the components to be mixed are supplied to the connection spouts 9 and 11 under pressure.
• the component flowing into the connecting nozzle 9 is accelerated on its way to the narrowest point of the flow channel 2, hits against a leading edge 12 and generates 3 rapidly rotating vortices in the mixing chambers 3, the vortex in the upper mixing chambers 3 in FIGS Clockwise and the vortex in the lower Mischka ⁇ imern 3 rotates counterclockwise.
• the mixing components brought in via the connecting sleeves 11 are likewise set into a rapid rotary movement by the tangential arrangement of the feed channels 6, namely in the same direction as the eddies in the mixing chambers 3. Therefore, the mixing chambers 3 already enter in the same direction rotating jet, which no longer or no longer has to be accelerated as strongly as a jet, such as in the known mixing device, which is only set in rotation in the mixing chamber.
• the mixing device according to the invention less energy is therefore required to mix the components, it being found that the degree of mixing is still considerably better than in the known mixing device.
• Another advantage of the mixing device according to the invention is that practically any number of components can be mixed in one mixing device. It is thus possible in the mixing device of FIG. 3 to mix seven components intimately.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)

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ID=6428635

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Citations (4)

• 1991
  • 1991-04-02 DE DE4110596A patent/DE4110596A1/de active Granted
• 1992
  • 1992-04-01 WO PCT/EP1992/000727 patent/WO1992017270A1/de unknown

Patent Citations (4)

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