Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
  • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
  • F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/877—With flow control means for branched passages
  • Y10T137/87877—Single inlet with multiple distinctly valved outlets

Definitions

• the invention relates to a change he distribution for highly viscous liquids, which consists of a central distribution space (1), in which a product line I (2) and two product valves (3) open, each of the product valves (3) being designed as a guide cylinder Housing (4) with a branching on the side
• the invention relates to a device for the mutual distribution of polymer melt onto two mutually operated treatment units, such as, for example, two polymer filters or processing extruders and granulators.
• the object of the present invention is to change a distribution he change the type mentioned so that despite a constantly mutually closed product valve, the product flow flows completely evenly through the central distribution space and the second open product valve, without the formation of dead spaces, especially in the distribution space. Furthermore, decomposition or cross-linking of product residues in the closed valve should be avoided as far as possible.
• This object is achieved according to the invention by a change he distributes the type mentioned, which is characterized in that
• the two product valves (3) are arranged in a Y-shape to the product line I (2), the center lines of the two product valves (3) being at an angle of 100 to 140 ° to one another and at an angle of 50 to 70 ° to the center line of the product line I (2) run,
• valve head (8) has a mushroom-shaped displacer attachment (11) which, when the valve is closed, is positioned completely in the central distribution space (1) with the formation of a gap (i) for walling the distribution space and the stem (12) of which is open when the valve is open Valve is positioned at the branch of product line II (6),
• the central distribution space (1) including the displacement attachment (11) positioned in it, has only surfaces and edges that run at an obtuse angle to the product flow, with the exclusion of surfaces or edges arranged perpendicular to the product flow.
• the product valve housing (4) preferably has in the region of the
• Housing extension (5) has a valve seat (13) into which the valve head of a valve piston of an auxiliary valve (10) movable within a housing designed as a guide cylinder engages in the closed position, the housing of the auxiliary valve (10) optionally having closable lines (15) for Venting and / or Product emptying and / or for feeding auxiliary materials, such as air or nitrogen or steam, is connected.
• the present invention is characterized in that it avoids the disadvantages of normal switching or changing valves.
• the exchange distribution is far superior to conventional valves.
• the interchangeable distributor was equipped according to the invention with the following special features:
• Valve housing given a relatively small total pressure loss in the manifold at the necessary points.
• the piston and the valve seat are designed so that there is a smooth, shock-free opening flow characteristic.
• the opening characteristics of the valve make it possible to make the distributors switchable fully automatically.
• the valve seat is one of the reasons for the soft opening characteristics. Deliberately elongated opening cones in the distributor housing and the selected tolerances allow the valve to be opened slowly without pressure surges.
• the mushroom-shaped displacement cap of the closed valve is set so that it protrudes over the center line into the opposite tube space.
• the mushroom head provides resistance to the straight, short passage of the product and forces the main mass of the product to slide the longer way along the housing wall.
• the obtuse angles favor this product guidance. This results in a perfect rinsing effect.
• the diameter of the shaft at the base was reduced as far as possible. The bigger one
• Mushroom head moves the current further towards the foot of the mushroom. This design point also serves to improve product flow guidance along the longer outer wall of the housing.
• the housing was designed so that the polymer flow is conducted.
• the pressure differences are designed with the built-in valve piston so that a flushing of all corners and edges is guaranteed.
• the position of the product valves among themselves is optimized so that an optimal flow without flow shadows is guaranteed for the polymer flow in the distributor space.
• the angular position of preferably 120 ° to one another is an optimum in relation to the entire manufacture of the distributor structure.
• the possible range of the angular position is 100 to 140 °.
• the product valves of the interchangeable distributor can be equipped in a manner known per se with auxiliary valves for venting and / or emptying and / or feeding in aids.
• the auxiliary valves are preferably arranged so that they can run empty after actuation. This is particularly advantageous if the highly viscous liquid is a polymer melt that tends to carbonize. A Tangential attachment of the auxiliary valve to the product valve is advisable in many cases.
• the alternating distribution according to the invention can be used for any viscous liquid which is to be distributed alternately between two outlet lines from a single feed line or vice versa.
• a preferred application is the distribution of a polymer melt. Examples of such polymers are polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyamide 6, polyamide 6.6, polycarbonates,
• the distributor and the polymer lines must be surrounded by one or more heating jackets in which a suitable heat transfer medium circulates.
• Other types of heating, such as heating tapes, can also be used.
• Polymers have the unpleasant property of disintegrating into low and high viscosity substances in a hot, depressurized room. While the low-viscosity products become gaseous over time and disappear into the atmosphere, the high-viscosity products carbonize. This coal formation ultimately leads to total blockage of the lines and valves. If a valve of the interchangeable distributor is switched off and not used for a long time, it is advisable to carry out hydrolysis to clean the valve. The hydrolysis avoids charring of the product in the valve. Before the hydrolysis can be started, the valve must be completely drained of polymer. The steam is unable to push the polymer out, since it preferably has a pressure of 1 to 2 bar absolute, particularly preferably 1.0 to 1.3 bar.
• the steam feed for the hydrolysis is expediently carried out via the auxiliary valves arranged in the base body of the product valves. This allows hydrolysis to take place directly on the seat of the polymer valve begin. Safe steam removal, possibly loaded with oligomeric hydrolysis products, must be ensured.
• the steam is discharged via a vent connection of the auxiliary valve or via a corresponding drainage opening in product line II.
• Fig. 3 shows the central distribution room with a closed and an open product valve
• Figure 4 shows the product flow through the central distribution space of Figure 3.
• Fig. 1 shows a change distributor, consisting of the product line I (2) opening into the central distribution space (1) and the two product valves (3) (not shown completely).
• the product lines II (6) are oriented down to 90 °.
• the right product valve (3) is shown in the closed position and the left one in the open valve position.
• the product valves (3) themselves correspond to those of US Pat. No. 5,269,348.
• the housing (4) is expanded (5) on the side opposite the branch of the product line II (6), so that in cooperation of the extension (5) with the displacer attachment (11) the main product flow is deflected and evenly over the entire cross section of the valve and thus distributed over the entire cross section of the outlet line (6).
• the valve piston (7) guided in the housing (4) carries the valve head (8), which engages in the closed position in the valve housing seat (9) with an elongated opening cone.
• the valve head (8) carries a mushroom-shaped displacer attachment (11), which is described in more detail in FIG a gap (i) sufficient for the product flow remains.
• the displacer attachment (11) is located at the branch of the product line II (6) in order to perform its stowage and distribution function there.
• Fig. 2 shows a similarly designed interchangeable distributor, as in Fig. 1.
• Both product valves (3) are, however, connected to an auxiliary valve (10) in the area of the housing extension (5).
• the auxiliary valve (10) can be heated with heat transfer fluid via the connector (14). If desired, air or nitrogen or steam can be fed in via connection (15) for the hydrolysis of polymer residues.
• Fig. 3 shows the geometry of the displacer attachment (11) and its position within the distribution space (1).
• This geometry of the displacer attachment (11) in conjunction with the geometry of the distribution space (1) and the y-shaped arrangement of product line I (2) and product valves (3) results in a uniform product flow over the entire cross section, as shown in FIG. 4 by arrows shown.
• the distribution space (1) has no surfaces or edges running perpendicular to the product flow, rather all surfaces and edges run at an acute or obtuse angle to the product flow.
• the center lines of the product valves (3) form an angle of 100 to 140 °, preferably 120 ° to one another and from 50 to 70 ° to the center line of the product line I (2).
• the product lines II (6) are preferably designed horizontally down to 90 ° vertically.

Landscapes

• General Engineering & Computer Science (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Multiple-Way Valves (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Pipe Accessories (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Coating Apparatus (AREA)
• Pipeline Systems (AREA)
• Nozzles (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7912325

Family Applications (1)

Country Status (11)

Families Citing this family (6)

Citations (5)

Family Cites Families (5)

• 1999
  • 1999-06-24 DE DE19928860A patent/DE19928860A1/de not_active Withdrawn
• 2000
  • 2000-06-23 DE DE50006423T patent/DE50006423D1/de not_active Expired - Lifetime
  • 2000-06-23 EP EP00943883A patent/EP1200241B1/de not_active Expired - Lifetime
  • 2000-06-23 US US10/018,833 patent/US6763852B1/en not_active Expired - Lifetime
  • 2000-06-23 CN CNB00809375XA patent/CN1264667C/zh not_active Expired - Lifetime
  • 2000-06-23 EA EA200200038A patent/EA003050B1/ru not_active IP Right Cessation
  • 2000-06-23 AU AU58197/00A patent/AU5819700A/en not_active Abandoned
  • 2000-06-23 JP JP2001506075A patent/JP2003503230A/ja active Pending
  • 2000-06-23 WO PCT/EP2000/005875 patent/WO2001000384A1/de not_active Ceased
  • 2000-06-23 AT AT00943883T patent/ATE266517T1/de not_active IP Right Cessation
  • 2000-06-23 KR KR1020017016585A patent/KR100728404B1/ko not_active Expired - Fee Related
  • 2000-06-23 ES ES00943883T patent/ES2219358T3/es not_active Expired - Lifetime

Patent Citations (5)

Non-Patent Citations (1)

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