GB1597150A - Method of producing a static mixer device - Google Patents
Method of producing a static mixer device Download PDFInfo
- Publication number
- GB1597150A GB1597150A GB50331/77A GB5033177A GB1597150A GB 1597150 A GB1597150 A GB 1597150A GB 50331/77 A GB50331/77 A GB 50331/77A GB 5033177 A GB5033177 A GB 5033177A GB 1597150 A GB1597150 A GB 1597150A
- Authority
- GB
- United Kingdom
- Prior art keywords
- packing
- layers
- sheet
- electrodes
- welding
- 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.)
- Expired
Links
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
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
- B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of flat pieces of material
-
- 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
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
- B01F25/4322—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa essentially composed of stacks of sheets, e.g. corrugated sheets
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- Manufacture Of Switches (AREA)
Abstract
The stack for the mixing device consists of individual layers (11a, 11b) assembled from sheet metal strips (13) which leave open flow channels (12). The two adjacent layers touch on bearing points (13b) of the edges (13a) and are there welded together. This is done in one pass with the aid of electrical resistance welding under pressure. The welding electrode arrangement has two electrodes (14, 15) with mating surfaces (14a, 16a), the one electrode (15) being provided with a layer (16) of an electrically insulating material. As soon as the two mating surfaces (14a, 16a) are brought into contact, the interior of the two electrodes forms a cavity corresponding to the shape of the stack to be welded together. Inserted into the one electrode there are mandrel-shaped insulating bodies (17) arranged in a gauge-like manner, which serve for feeding in the layers (11a, 11b) consisting of sheet metal strips (13). <IMAGE>
Description
(54) METHOD OF PRODUCING A STATIC MIXER DEVICE
(71) We, SULZER BROTHERS LIMITED, a
Company organised under the laws ofSwitzer
land, of Winterthur, Switzerland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a method of making a static mixer device comprising at least one packing of sheet-metal elements
for insertion in a mixer tube, the sheet
metal elements being disposed in a number layers and each two adjacent layers being in contact with one another at contact points with flow ducts being provided between
adjacent layers, and to a multi-part welding electrode arrangement for performing the method.
It is well known for flow media which it is required to mix to flow in co-current flow
through a static mixer consisting of at least one packing disposed in a mixer tube.
The term flow media denotes, for example, liquids, gases or gas mixtures, low viscosity or high-viscosity media, and even solid particles. Two or more liquids, gases or gas mixtures, a liquid and a gas, or a liquid and solid particles, may be passed, for example, in co-current through the device.
Various constructions of packings are known for such static mixers.
One such construction comprises a plurality of corrugated layers, the layers being in contact with one another by the "humps" of their corrugations and intersecting flow ducts being provided between each two adjacent layers.
It was hitherto conventional practice to interconnect the individual layers manually and individually by spot-welding at their contact points and the layers were accordingly cut to the inside cross-section of the mixer tube, the packing then being pushed into the mixer tube.
In another construction of packing used for static mixers, the individual layers consist of sheet-metal strips, the sheet-metal strips of two adjacent layers crossing one another and resting on one another by their edges and the flow ducts being formed by gaps between the strips.
With this form of construction it was also conventional practice to use spot-welding to interconnect the sheet-metal strips at their contact points in successive operations.
Since such packings have a large number of contact points, the known production process is extremely tedious.
Another known packing formed from sheet-metal strips (although the invention is not applied to such a packing) comprises a plurality of sheet-metal strips arranged in layers and extending at an angle to the longitudinal axis of the mixer duct, the sheetmetal strips being rigidly connected to a sheet-metal web perpendicular to the longi -tudinal axis of the mixer tube.
A plurality of such inserts constructed after the style of "chevaux de frise" are fitted one inside the other and thus form a packing.
In this packing the "chevaux de frise" consist of stampings made with an oversize allowance as compared with the cross-section of the mixing duct.
Since in most cases the packing must be fitted as exactly as possible to the inner wall of the mixer tube in order to produce a homogeneous mixture, this latter packing is filled after assembly with a low-melting point metal or plastic to give it the necessary stability after the contact points of the individual sheet-metal strips have been welded together manually in individual operations. The packings are then turned to the diameter of the circular cylindrical mixing tube, and the low-melting point material removed.
This method, which can also be applied to the two constructions of packing previously described, if the packings are made with an oversize allowance, entails considerable labour.
The object of the invention is to provide a method of producing packings for static mixers which is much more economic in terms of production than the hitherto conventional processes.
The use of such a method was hitherto considered impracticable, for the following reasons. It was assumed that when the layers are stacked different electrical resistances are formed at the individual contact points.
As a result, the electrical current would be distributed unevenly by Kirchhoff's law, and welds of varying strength would be formed.
The invention is based on the surprising finding that this uneven distribution of the electrical current is of secondary importance.
If there is bad contact between two points of adjacent layers which are to be brought into contact with one another, the metal does in fact melt as a result of arcing until the layers come into contact at the contact points.
With the invention it is possible to weld together all the points of contact of a number of layers of a packing in one operation. It should also be pointed out that the sheetmetal elements need to be cut to the final size only in the longitudinal direction according to their arrangement in the mixer tube, while the width of the individual sheetmetal elements of their corrugation heights are so dimensioned that the resulting packing has an oversize allowance with respect to the inside diameter of the mixer tube.
This oversize is equivalent to the reduction of the stack height of the packing during the welding operation, since with the resistance welding applied according to the invention there is some upsetting or bulging at the welding points as a result of the pressure applied laterally to the sheet-metal elements of the packing.
The invention also comprises a packing produced by the method according to the invention.
According to a further aspect the invention provides a pair of electrodes for performing the above method.
Preferably at least one electrode of the pair is provided with pin-type insulators in the form of a jig to facilitate insertion of the sheet-metal strips therein.
Some exemplary embodiments of the invention will now be described with reference to the accompanying drawings in which:
Fig. 1 of the drawing is a longitudinal section of a static mixer in which a plurality of packings are disposed.
Fig. 2 is a perspective view of a packing of the kind used in the mixer of Fig. 1,
Fig. 3 shows two intersecting layers consisting of sheet-metal strips and having an elliptical cross-section, and
Fig. 4 is a perspective view of a two-part welding electrode arrangement, one electrode being provided with pin-type insulators in the form of a jig.
The mixer device shown in Fig. 1 comprises a circular cylindrical tube 1. The cross-section may, however, have a different configuration if required, e.g. square. The device may be disposed either vertically or horizontally in space.
The mixer tube 1 has a flange 2 for connection to the supply conduit for one of the flow media a and a flange 3 for connection to the discharge of mixture of the media c, the latter being formed from medium a and a flow medium b introduced into the mixer through a tube 4.
Five packings 5a--5e are disposed consecutively in the device offset by 90 to one another about the longitudinal axis of the mixer tube. An element 3a in the form of a flat section bent to a zig-zag form is fitted in an annular recess in the flange 3 to retain the packings in the tube.
In the exemplified embodiment, the individual packings 5 (see Fig. 2) consist of a plurality of corrugated layers 6, adjacent layers contacting one another by their corrugation humps 6a at contact points at which they are interconnected in one operation by electrical resistance welding before they are introduced into the mixer tube.
The welding is performed with a jig which may comprise of two tube half-shells which also form the welding electrodes. In these conditions the individual layers are placed one above the other in a cavity formed in the jig by the half-shells.
Fig. 3 is a detail of a packing for use in a circular cylindrical mixer tube. The two layers 8a and 8b are, in this case, assembled from sheet-metal strips 10 which leave free flow spaces 9, the two adjacent layers contacting one another at the contact points 10b of the edges 10a, where they are welded together as an assembly.
In the embodiment shown in Fig. 4, the layers of the packing have an elliptical configuration, in view of the circular cylindrical cross-section of the mixer tube and because they are disposed at an angle to the axis of the latter.
In certain mixing processes, e.g. when the components for mixing have similar viscosities e.g., oils, it is unnecessary for the packings to be accurately fitted into the circular cylindrical mixer tube. In such cases it may be sufficient to make the end edges of the metal strips straight and at right angles to their length, so that they are stepped in relation to one another at their ends, rather than as shown in the illustration in
Fig. 3.
Fig. 4 is a perspective view of a two-part welding electrode device for performing the method according to the invention,
The device, which in this case is intended for the production of a circular cylindrical packing-as in Fig. P-, comprises two electrodes 11 and 12 with fitting surfaces 1 la and 12a. Electrode 12 is provided with a coating of electrically insulating material so that surface 12a is formed by the insulating coating. When the two fitting surfaces are brought into contact with one another, the interior of the two electrodes forms a circular cylindrical cavity corresponding to the shape of the packing to be welded.
Insulators 14 in the form of pins are arranged in the form of a support jig in one of the electrodes to enable the layers-which consist of sheet-metal strips 8a, 8b etc.
(see Fig. 3) in the exemplified embodiment- to be introduced in the required arrangement.
The packing is produced as follows:
The individual sheet-metal strips are first cut or stamped out to the appropriate final dimension according to their arrangement in the mixer tube, the width of the individual sheet-metal strips being produced with an allowance with respect to the inside diameter of the mixer tube and are then assembled in the electrodes. The allowance for all the
sheet-metal strips is equivalent to the reduction in the stack height of the packing during the welding operation, which takes place under pressure.
The two electrodes are then pressed one upon the other under pressure and voltage is applied to the electrodes. On the resulting current surge, the sheet-metal strips soften at their contact points so that the strips of adjacent layers are pushed into one another
somewhat at such points and are welded in a single operation.
The configuration of the welding electrodes and of the support jig are adapted in each case to the shape and type of packing for welding.
Although the embodiment shown in Fig. 4 is very advantageous inasmuch as the jig is disposed in one of the electrodes, it would be feasible for the packing-after the individual layers have been appropriately cutto be first assembled in a jig consisting of pintype insulators, and then inserted together with the jig into the electrodes, and then weld the packing under pressure in the manner according to the invention.
WHAT WE CLAIM IS:
1. A method of assembling a packing for a static mixer device having at least one packing of sheet-metal elements inserted in a mixer tube, the sheet-metal elements being disposed in a number of layers and each two adjacent layers being in contact with one another at contact points to provide intersecting flow ducts between adjacent layers, in which, the layers are all interconnected at their contact points by electrical resistance welding in one operation.
2. A method according to Claim 1, in which the individual sheet-metal elements are cut before assembly to their final longitudina ldimension according to their arrangement in the mixer tube.
3. A method according to Claim 1, in which the width of said sheet-metal elements when comprising sheet-metal strips, or the corrugation heights of said sheet-metal elements when comprising corrugated layers, are so dimensioned that the resulting packing has, before welding, an oversize allowance with respect to the inside diameter of the mixer tube, such allowance being equivalent to the reduction of the stack height of the packing during the welding operation.
4. A packing for a static mixer system produced by the method according to Claims 1, 2 or 3.
5. A packing according to Claim 4, in which the said layers comprise of sheetmetal strips and the sheet-metal strips of two adjacent layers intersect and rest on one another by their edges, and in which the layers have an elliptical configuration for assembling in a mixer tube of circular crosssection, and the layers are disposed at an angle to one another.
6. A packing according to Claim 5, in which the sheet-metal strips of each layer are stepped in relation to one another at their ends.
7. A pair of welding electrodes when used in the method according to Claim 1, in which the electrodes have fitting surfaces, the fitting surface of one electrode being brought into contact with the fitting surface of the other electrode at completion of the welding operation the fitting surface of said other electrode being electrically insulated.
8. Welding electrodes according to Claim 7, in which at least one electrode is provided with pin-type insulators in the form of a jig to support said layers therein.
9. A method of assembly of a packing substantially as herein described with reference to the accompanying drawings.
10. A packing substantially as herein described with reference to the accompanying drawings.
11. An electrode system substantially as herein described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. A method of assembling a packing for a static mixer device having at least one packing of sheet-metal elements inserted in a mixer tube, the sheet-metal elements being disposed in a number of layers and each two adjacent layers being in contact with one another at contact points to provide intersecting flow ducts between adjacent layers, in which, the layers are all interconnected at their contact points by electrical resistance welding in one operation.
2. A method according to Claim 1, in which the individual sheet-metal elements are cut before assembly to their final longitudina ldimension according to their arrangement in the mixer tube.
3. A method according to Claim 1, in which the width of said sheet-metal elements when comprising sheet-metal strips, or the corrugation heights of said sheet-metal elements when comprising corrugated layers, are so dimensioned that the resulting packing has, before welding, an oversize allowance with respect to the inside diameter of the mixer tube, such allowance being equivalent to the reduction of the stack height of the packing during the welding operation.
4. A packing for a static mixer system produced by the method according to Claims 1, 2 or 3.
5. A packing according to Claim 4, in which the said layers comprise of sheetmetal strips and the sheet-metal strips of two adjacent layers intersect and rest on one another by their edges, and in which the layers have an elliptical configuration for assembling in a mixer tube of circular crosssection, and the layers are disposed at an angle to one another.
6. A packing according to Claim 5, in which the sheet-metal strips of each layer are stepped in relation to one another at their ends.
7. A pair of welding electrodes when used in the method according to Claim 1, in which the electrodes have fitting surfaces, the fitting surface of one electrode being brought into contact with the fitting surface of the other electrode at completion of the welding operation the fitting surface of said other electrode being electrically insulated.
8. Welding electrodes according to Claim 7, in which at least one electrode is provided with pin-type insulators in the form of a jig to support said layers therein.
9. A method of assembly of a packing substantially as herein described with reference to the accompanying drawings.
10. A packing substantially as herein described with reference to the accompanying drawings.
11. An electrode system substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1524476A CH611178A5 (en) | 1976-12-03 | 1976-12-03 | Process for manufacturing a stack for a static mixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1597150A true GB1597150A (en) | 1981-09-03 |
Family
ID=4407559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB50331/77A Expired GB1597150A (en) | 1976-12-03 | 1977-12-02 | Method of producing a static mixer device |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS53104548A (en) |
| AT (1) | AT356485B (en) |
| AU (1) | AU510849B2 (en) |
| BE (1) | BE861429A (en) |
| BR (1) | BR7708034A (en) |
| CH (1) | CH611178A5 (en) |
| DE (1) | DE2748128A1 (en) |
| ES (1) | ES464576A1 (en) |
| FR (1) | FR2372652A1 (en) |
| GB (1) | GB1597150A (en) |
| IT (1) | IT1088713B (en) |
| MX (1) | MX148007A (en) |
| NL (1) | NL7700090A (en) |
| SE (1) | SE7713252L (en) |
| ZA (1) | ZA777055B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150945A (en) * | 1983-11-25 | 1985-07-10 | Foster Wheeler Power Prod | Treatment of reaction product gas & apparatus therefor |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2808854C2 (en) * | 1977-05-31 | 1986-05-28 | Gebrüder Sulzer AG, 8401 Winterthur | Flow channel provided with internals for a medium involved in an indirect exchange, in particular heat exchange |
| FR2452963A1 (en) * | 1979-04-05 | 1980-10-31 | Anhydride Carbonique Ind | Prodn. of atomised products from liq. phase - in drying e.g. milk prods. with injection of carbon di:oxide into turbulence zone upstream of atomisation station |
| CH642564A5 (en) * | 1979-10-26 | 1984-04-30 | Sulzer Ag | STATIC MIXING DEVICE. |
| SE432059B (en) * | 1980-04-11 | 1984-03-19 | Munters Ab Carl | MIXING DEVICE FOR MIXING OF FLOWING MEDIA INCLUDING AT LEAST TWO SYSTEMS OF SEPARATED FLOW CHANNELS |
| DE3021606A1 (en) * | 1980-06-09 | 1981-12-17 | Howard W. Mountain Lakes N.J. Cole jun. | Foam generator including tubular chamber with mixer - comprising coiled honeycomb strip defining alternate passages of increasing and decreasing size |
| US4522504A (en) * | 1983-12-08 | 1985-06-11 | Pyles Division | Linear in-line mixing system |
| NL8601495A (en) | 1986-06-09 | 1988-01-04 | Suiker Unie | METHOD AND REACTOR VESSEL FOR THE FERMENTATION PREPARATION OF POLYSACCHARIDES, IN PARTICULAR XANTHANE. |
| DE4428813C2 (en) * | 1994-08-13 | 1996-11-14 | Ewald Schwing Verfahrenstechni | Device for static mixing of fluids, in particular thermoplastic, and method for producing such a device |
| DE29601936U1 (en) * | 1996-02-08 | 1996-04-18 | Preussag Anlagenbau | Static mixer |
| US6224833B1 (en) * | 1998-12-15 | 2001-05-01 | Koch-Glitsch, Inc. | Apparatus for contacting of gases and solids in fluidized beds |
| JP6115930B2 (en) * | 2012-03-12 | 2017-04-19 | 国立研究開発法人産業技術総合研究所 | Multi-stage split channel mixer |
| CN105643216B (en) * | 2016-04-02 | 2018-02-09 | 无锡市蠡园金属容器有限公司 | Static mixer processing technology |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH444335A (en) * | 1966-12-12 | 1967-09-30 | Aufzuege Ag Schaffhausen | Welding process for the manufacture of components |
| US3612813A (en) * | 1970-04-29 | 1971-10-12 | United Aircraft Corp | Method of forming a lightweight metal sandwich having a honeycomb core |
| CH537208A (en) * | 1971-04-29 | 1973-07-13 | Sulzer Ag | Mixing device for flowable media |
-
1976
- 1976-12-03 CH CH1524476A patent/CH611178A5/en not_active IP Right Cessation
-
1977
- 1977-01-06 NL NL7700090A patent/NL7700090A/en not_active Application Discontinuation
- 1977-10-27 DE DE19772748128 patent/DE2748128A1/en not_active Withdrawn
- 1977-10-27 AT AT767677A patent/AT356485B/en active
- 1977-11-18 MX MX171394A patent/MX148007A/en unknown
- 1977-11-23 SE SE7713252A patent/SE7713252L/en not_active Application Discontinuation
- 1977-11-28 AU AU31022/77A patent/AU510849B2/en not_active Expired
- 1977-11-28 ZA ZA00777055A patent/ZA777055B/en unknown
- 1977-11-29 ES ES464576A patent/ES464576A1/en not_active Expired
- 1977-12-01 IT IT30256/77A patent/IT1088713B/en active
- 1977-12-01 JP JP14461277A patent/JPS53104548A/en active Granted
- 1977-12-02 GB GB50331/77A patent/GB1597150A/en not_active Expired
- 1977-12-02 BR BR7708034A patent/BR7708034A/en unknown
- 1977-12-02 BE BE183108A patent/BE861429A/en unknown
- 1977-12-02 FR FR7736417A patent/FR2372652A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150945A (en) * | 1983-11-25 | 1985-07-10 | Foster Wheeler Power Prod | Treatment of reaction product gas & apparatus therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1088713B (en) | 1985-06-10 |
| JPS6132117B2 (en) | 1986-07-24 |
| CH611178A5 (en) | 1979-05-31 |
| SE7713252L (en) | 1978-06-04 |
| NL7700090A (en) | 1978-06-06 |
| ZA777055B (en) | 1978-09-27 |
| MX148007A (en) | 1983-02-23 |
| ATA767677A (en) | 1979-09-15 |
| FR2372652A1 (en) | 1978-06-30 |
| FR2372652B1 (en) | 1981-01-09 |
| ES464576A1 (en) | 1978-09-01 |
| AU3102277A (en) | 1979-06-28 |
| AU510849B2 (en) | 1980-07-17 |
| JPS53104548A (en) | 1978-09-11 |
| AT356485B (en) | 1980-04-25 |
| BR7708034A (en) | 1978-07-25 |
| DE2748128A1 (en) | 1978-06-08 |
| BE861429A (en) | 1978-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19951202 |