Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F5/00—Dryer section of machines for making continuous webs of paper
  • D21F5/18—Drying webs by hot air
  • D21F5/185—Supporting webs in hot air dryers
  • D21F5/187—Supporting webs in hot air dryers by air jets
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
  • D06C7/00—Heating or cooling textile fabrics
  • D06C7/02—Setting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
  • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
  • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes

Definitions

• the present invention relates to a manifold. More particularly, it relates to a manifold provided at the delivery end of a blower/dryer used to blow fluid e.g. hot air on fabric, cellulosic or other fibrous material.
• a blower/dryer used to blow fluid e.g. hot air on fabric, cellulosic or other fibrous material.
• WO03/038364A1 discloses a waste heat recovering device, cleaning-water auto-filtering device, and exhaust gas regenerating device for tenters.
• textile (TX) woven by a weaving machine is dipped in a mixture of water, resin, and chemicals in a settling tank (ST), dehydrated by a mangle (MG), and dried and heat-treated using several chambers (CHI to CH4) so as to improve its quality.
• Each of the chambers (CHI to CH4) comprises a main body (CM) surrounded with an insulating material (IS), and hundreds of hot-air nozzles (HN) for jetting hot air to an upper and a lower side of the textile (TX) passing throughout the center of the main body (CM).
• CM main body
• IS insulating material
• HN hot-air nozzles
• the hot-air nozzles (HN) are set on several hot-air distribution boxes (HD) connected to a hot-air pipe (HP), and the hot air heated by a heater (HT) cycles in the hot-air pipe (HP) using a hot-air blower (HB).
• Each of gas exhaust pipes (GP) is set on an upper side of each of the chambers (CHI to CH4), the gas exhaust pipes (GP) communicate with one main gas exhaust pipe (GM), and an exhaust-blower (BW) is connected to the main gas exhaust pipe (GM).
• cold air flowing into each chamber through : inlet and out through its outlet is mixed with air cycling in the chamber and heated by the heater (HT) to a predetermined temperature
• the heated hot air flows by the hot-air blower (HB) through the hot-air pipe (HP) and hot-air distribution boxes (HD) to the hot-air nozzles (HN)
• the textile (TX) passing between the upper and lower hot-air nozzles (HN) is dried or heated by the hot air jetted through the hot-air nozzles (HN).
• 4,586,268 teaches a horizontal heat treatment tunnel for the treatment of fibers, threads, slit film or the like fibrillary material used in the textile -field, wherein the material to be heat treated is transported side-by-side along a travel path, in endless length form, through the horizontally arranged tunnel, said tunnel comprising a heat-insulated housing having a treatment chamber, an inlet means for allowing entry of the material and an outlet means for allowing withdrawal of the material from the housing; a fan chamber; fan means arranged within said fan chamber for effecting circulation of a gaseous treatment medium within said housing and through said treatment chamber; heater means disposed downstream of said fan means in the treatment chamber for heating said treatment medium before the treatment medium contacts fibrillary material moving along said travel path through said treatment chamber; fan intake connecting means positioned solely to draw the gaseous treatment medium away from the travel path; fan exhaust means positioned solely to direct the gaseous treatment medium toward the travel path through the fibrillary material and toward the fan intake connecting means; said fan intake connecting means including a fan
• Stenter and similar equipment like hot flues, relax driers or belt driers are used to stretch the fabric width wise by air treatment of fabrics, especially by drying and/or heat setting textile or paper fabric.
• the air/fluid that is typically heated up to 220 °C by heating element, is applied using many holes/openings on the manifold(s) (not shown) to one or both sides of the fabric which is continuously guided past the manifold(s).
• it is important to maintain a uniform outlet distribution of the hot air/fluid stream from the manifold so that the result of the treatment is symmetric and uniform across the entire width of the fabric, cellulosic or other fibrous material.
• the hot air is distributed using the so-called manifold(s) having holes/openings which are arranged above and/or below the fabric, cellulosic or other fibrous material through which the pre-heated hot air is supplied using at least one blower.
• Fig. l(a)(ii) shows front view of an opening/hole on a manifold used in the prior art
• Fig. l(a)(iii) shows front view of computational fluid flow diagram of opening/hole shown in fig.l(a)(i);
• Fig. l(b)(i) shows top view of an opening/hole with stumbling edges on a manifold plate used in the prior art
• Fig. l(b)(ii) Shows front view of an opening/hole with stumbling edges on a manifold plate used in the prior art
• Fig. l(b)(iii) shows front view of computational fluid flow diagram of an opening/hole with stumbling edges on a manifold plate used in the prior art as shown in fig. l(b)(i);
• Fig. l(c)(i) shows top view of an opening/hole with zigzag shaped design on a manifold plate used in the prior art
• Fig. l(c)(ii) shows front view of an opening/hole with zigzag shaped design on a manifold plate used in the prior art
• Fig. l(c)(iii) shows front view of computational fluid flow diagram of an opening/hole with zigzag shaped design on a manifold plate used in the prior art as shown in fig. l(c)(i);
• a disadvantage of the manifold design shown in Figs. l(a)(i)-(a)(iii), is a flow related effect, which causes the hot air stream (21) exiting from the circular opening (26) on the manifold to be inclined in the (air) flow direction, i.e., manifold end and not at right angle to the fabric plane.
• the angle of inclination (24) is a result of the arc cosine of the ratio - sum of the air outlet cross section area to the air-inlet cross-section area of the opening (26) of the manifold.
• l(c)(i)-(c)(iii) for obtaining a perpendicular air discharge (21) from circular opening (26) on the manifold, i.e., the manifold is provided with a compensation angle with respect to the vertical plane using a zigzag-shaped design (27) of the manifold wall, which compensates the discharge angle as accurately as possible in case of the straight i.e. non-staggered outlet openings of the manifold.
• This approach is significantly more complex to manufacture which results in additional aerodynamic losses due to the slightly zigzag-shaped manifold plate (27) that is folded.
• the object of the present invention is to provide an aerodynamically efficient manifold at the delivery end of a blower/dryer for treatment of fabric, cellulosic or other fibrous material in which a uniform distribution of fluid across length and breadth of manifold can be obtained with good treatment results of fabric, cellulosic or other fibrous material.
• At least one manifold at the delivery end of blower/dryer having a plate with at least one outlet opening which is conical having narrow inlet facing inside of the distribution channel of the manifold and wide outlet flush with the outer surface of the manifold plate and wherein fluid stream uniformly exits from the outlet opening across the length of the plate and the flow direction is controlled by varying the depth of the conical opening.
• a manifold (14/16) provided at the delivery end of a blower, for fluid treatment of fabric, cellulosic or other fibrous material (12) passing over the plate (44) of the said manifold (14/ 16) comprising: a closed distribution channel (50) having an entry port (46) at one end; and, a plate (44) with at least one outlet opening (63); characterized by the fact that the said outlet opening (63) is conical having narrow inlet (64) facing inside of the distribution channel (50) and wide outlet (65) flush with the outer surface of the plate (44), over which passes the fabric, cellulosic or other fibrous material (12).
• a manifold as described above characterized by the fact that, its distribution channel (50) tapers from the entry port (46) to the other end.
• a manifold as described above characterized by the fact that its plate (44) has outlet openings (63) across its length and breadth.
• a manifold as described above characterized by the fact that the outlet opening(s) (63) are arranged in one or more rows, with or without offset to each other.
• outlet opening(s) (63) is/are nearly circular or oval.
• manifolds as described above, characterized by the fact that at least two manifolds are mirror images of each other.
• Figure 2(i) shows front view of the manifold according to this invention.
• Figure 2(ii) shows side view of the manifold according to this invention.
• Figure 2(iii) shows enlarged view of outlet opening of the manifold shown in figure 2(ii).
• Figure 2(iv) shows elevation view of computational fluid flow diagram of outlet opening shown in figure 2(iii).
• Figure 2(v) shows side view of computational fluid flow diagram of outlet opening shown in figure 2(iii).
• Figure 3(i) shows top view of outlet opening of the manifold according to this invention.
• Figure 3(ii) shows flow diagram of fluid exiting through an outlet opening according to this invention.
• Figures 4(a)(i), 4(b)(i) and 4(c)(i) show sectional view of outlet openings of varying depths along line A-A in Figs. 4(a)(ii), 4(b)(ii) and 4(c)(ii) respectively.
• Figures 4(a)(ii), 4(b)(ii) and 4(c)(ii) show elevation outlet openings of varying depths.
• Figures 4(a)(iii), 4(b)(iii) and 4(c)(iii) show elevation view of computational fluid flow diagram of conical outlet opening of varying depths
• Figure 5 shows schematic diagram of a pair of manifolds at the delivery end of a blower/dryer according to this invention.
• numerals indicate the objects/parts stated/described against the said numerals:
• manifold (14/16) has a distribution channel (50) with an entry port (46) which is connected to the delivery end via feed channel (22) of a blower/dryer (not shown).
• the distribution channel (50) is closed at the other end, making it a closed distribution channel (50).
• the distribution channel (50) tapers from the entry port (46) to the other closed end, which typically resembles the dome shape of a chimney, to avoid problem of non-uniform treatment of the fabric, cellulosic or other fibrous material. Consequently, the cross sectional area of the distribution channel (50) reduces towards the closed end.
• the manifold (14/16) comprises of a plate (44), having at least one outlet opening (63) which is conical, with narrow inlet (64) facing inside of the distribution channel (50) and wide outlet (65) flush with the outer surface of the plate (44) over which passes the fabric, cellulosic or other fibrous material (12).
• more than one outlet openings (63) are provided on the plate (44) of the manifold (14/16).
• the fluid (23) is fed into the manifold (14/16) from the feed channel (22) of a blower/dryer through the entry port (46). From the entry port (46), the fluid stream (23) flows into distribution channel (50) and then it is blown (21) onto the fabric, cellulosic or other fibrous material (12) through the conical outlet opening(s) (63) on the plate (44).
• the sectional area of the distribution channel (50) is such that approximately the same amount of fluid is discharged from all the conical outlet openings (63) regardless of their distance from the port area (46).
• the fluid (23) flows from the narrow inlet (64) to the wide outlet (65) of the conical outlet opening (63) on the plate (44) of the manifold (14/16) and therefore exits (21) at right angle to the plate (44).
• the conical outlet opening (63) minimises internal aerodynamic losses and thus improves mass flow rate and provides more streamlined laminar flow. Due to improvement in mass flow rate, drying/cooling efficiency is improved with same amount of energy consumption.
• conical outlet opening(s) (63) is/are nearly circular or oval. Due to the said nearly circular/oval shape of the conical outlet opening(s) (63) very smooth, less turbulent flow of fluid with high velocity is achieved which results in more mass flow rate and better drying/cooling efficiency. Further, the said conical outlet openings (63) are preferably embossed into the plate (44).
• the conical outlet opening (63) has been designed to ensure that no sharp edges will come in contact with the fabric, cellulosic or other fibrous material, especially knit fabric by making the wide outlet (65) of the conical outlet opening (63) flush with the outer surface of the plate (44).
• the plate (44) has conical outlet openings (63) across its length and breadth, as shown in fig. 2(i).
• the conical outlet opening(s) (63) are arranged in one or more rows, with or without offset to each other.
• the plate (44) serves as a wall to the distribution channel (50) and is placed on top side of the distribution channel (50).
• manifolds (14 arid 16) are mirror images of each other.
• Figure 5 is an illustration of one such preferable embodiment, which shows a schematic diagram of a pair of manifolds (14 and 16) at the delivery end of a blower/dryer. As shown in fig 3(ii), the fluid stream (23) flows approximately horizontal through the distribution channel (50) and is deflected in a nearly vertical direction to stream out (21) of the conical outlet opening (63).
• the fluid stream (23) flows from the narrow inlet (64) to the wide outlet (65) of the conical outlet opening (63).
• This turbulence (66) in turn causes a low pressure, which pulls the fluid stream in a sufficiently accurate 90° vertical direction when it flows out (21) through the conical outlet opening (63). This is similar to the Coanda Effect, which is known from fluid dynamics.
• a 90° vertical out streaming of the fluid ensures a 90° vertical striking of the fluid (21) onto the fabric, cellulosic or other fibrous material (12) which in turn causes a uniform down streaming of the fluid along the fabric, cellulosic or other fibrous material (12) in the direction of both edges of the fabric, cellulosic or other fibrous material (12).
• the outlet opening (63) of the manifold (14/16) has varying depth.
• one or more outlet opening(s) (63) of a manifold (14/16) vary in depth from the other outlet openings (63).
• the advantages of the present invention are as follows: 1.
• the manifold has low design cost and is aerodynamically efficient.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Drying Of Solid Materials (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

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Citations (5)

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• 2015
  • 2015-05-15 CN CN201580026914.8A patent/CN106605023B/zh active Active
  • 2015-05-15 EP EP15747844.7A patent/EP3143199B1/en active Active
  • 2015-05-15 WO PCT/IN2015/000209 patent/WO2015173835A1/en active Application Filing
  • 2015-05-15 KR KR1020167032411A patent/KR101983889B1/ko active IP Right Grant
  • 2015-05-15 ES ES15747844T patent/ES2748449T3/es active Active

Patent Citations (5)

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