JPH0144364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial gas purification device, and more particularly to the structure and manufacturing method of a filter hose configured to filter gas and air and attached to a drain pipe or the like.

Currently, gas filtration includes fiber filtration hoses,
This is done using various filters. Such filter hoses are made of knitted fabric and have a hollow body with a longitudinal seam and both open ends. These open ends (or one of them) are folded back and attached to the hose body to form a cuff, i.e. a portion for attaching the hose to the connection.

Typically, the creation of longitudinal seams and the attachment of the open end to the hose is accomplished by suturing. However, this filtration hose manufacturing method has low production efficiency and involves many steps, including weaving, cutting a cloth of a predetermined width to fit the hose diameter, and forming the hose body and cuff portion by sewing. Cutting fabrics of different widths to manufacture filtration hoses requires considerable effort. Furthermore, the joint and the attachment of the open end of the hose are weaker than the rest of the hose, causing the joint to tear during operation, causing the hose to leak. Various seam-making methods are used, for example by folding the edges or butt-joining by means of fabric strips attached to the edges in a known manner (for example, Legkaya Industriya, Moscow, 1955). “Filtering Materials Made from Glass and
(See pages 20-21 of ``Chemical Threads''). Filtration hoses made by these methods have a short lifespan and require special initial materials. Besides these drawbacks, in all cases filtration hoses made of woven fabrics has ice strain, so a tightening device must be used to loosen the slack.

Cross-knitted tubes and methods for their production on circular knitting machines are known (for example, in ``Textile'' by A. S. Daridovich, published by Gizlegprom, Moscow-Leningrad, 1939).
“Manufacturing Process”, Part 281−
(See page 288). Although such tubes are seamless and have uniform strength around them, they can swell, deform,
A further drawback is that it has excessive porosity.

Also known are tubular warp knitted fabrics which are produced on flat warp knitting machines and consist of two pieces whose longitudinal edges are joined together. The tube is not uniform in strength around its circumference, expands at the joints and has a different loop structure.

Although the production of knitted fabric tubes on knitting machines shows considerable production efficiency, specific drawbacks, namely excessive porosity and deformation, prevent such tubes from being used for gas filtration or separation of fine particles.

The purpose of the present invention is to significantly lengthen the life of the hose and maintain its shape by having no joints, the hollow body and cuff portion not expanding, and having uniform strength both along the length and around the circumference (width direction). , and to provide a filtration hose with low manufacturing labor costs.

This objective is achieved by a filter hose made of tubular warp knitted fabric produced by a circular warp knitting machine.

The tubular warp knitted fabric produced by the circular knitted fabric has the same physical properties over the entire circumference of the tube, that is, its loop structure has uniform strength and uniform porosity. Compared to weaving, the production of warp knitted fabrics exhibits high production efficiency, but the use of circular warp knitting machines eliminates the step of sewing plain fabrics into tubes. By changing the texture, the strength of the warp knitted fabric can be easily changed in the vertical and horizontal directions, and the porosity of the loop structure can also be easily changed. Tubular warp knitted fabrics produced on circular warp knitting machines are therefore economical to use as filter hoses, and in this respect are advantageous compared to woven fabrics, weft knitted fabrics and non-woven fabrics.

The present invention provides a filtration hose in which the hollow body is made of thread and has an open end, and at least one of the open ends is folded back and attached to the hose body to form a cuff. According to the invention,
The hose hollow body is essentially 2
It is a tubular warp knitted fabric made of warp yarns of one strain, and the cuff part of the open end of the hose is made as a double bead knitted with one strain of warp yarns and connected to the hose body by a warp yarn of another strain, The warp yarns of the other systems are knitted into a loop structure of the hose body cloth.
With this hose structure, the double bead is connected to the hose body by the warp yarns of the other system, thereby extending the life of the entire hose, and the warp yarns of the other system are woven into the loop structure of the hose body. Since there are no longitudinal seams, the needle will not pierce the hose material, while the cuff attachment with multiple threads from other systems provides greater strength and no breakage during operation.

According to the invention, the cuff part has another (other) part consisting of a warp knitted fabric, which is composed of two warp yarns and is provided parallel to the double bead, The length of the part is not less than the length of the double bead.

The provision of another section made up of two warp threads and parallel to the double bead improves the operability of the cuff section in terms of attaching the hose to the connection section. According to this construction, even if a cuff part breaks, the hose is still held in the connection by the other cuff part, and vice versa.

The hose hollow body composed of a tubular warp knitted fabric has circular hollow parts on the outside, and these hollow parts are spaced at regular intervals and are knitted with one system of yarns and knitted with warp yarns of another system. The warp threads of these other systems are held inside the hose body and are arranged as intermediate strips, which connect adjacent parts of the warp fabric of the hose body and have circular hollow sections spaced at equal length intervals. a filler material arranged to hold the end of the circular hollow part and forming reinforcing ribs on the inside of each circular hollow part, the length of the intermediate strip being such that the length of the intermediate strip is such as to ensure that the filler material can be introduced into the circular hollow part. selected.

According to one embodiment of the invention, a splitting element is used as a filler.

Since we have provided a circular hollow part in the filtration hose body, which is knitted with warp threads of one system and held inside the hose body by warp threads of another system, the materials of the hose body and the circular hollow part are different from those of conventional filtration hoses. Since it does not break like the stitching of the above-mentioned parts in , the strength of the entire hose increases. Due to the provision of the intermediate strip of suitable length, the introduction of the filler material, for example the split ring element, into the circular hollow part is considerably simplified.

In another embodiment of the invention, a hard loose material is used as a filler in the circular hollow section.

To manufacture such a filtration hose, the present invention involves knitting threads to create a filtration hose hollow body with an open end, at least one of which is folded back and attached to the hose body. A method is provided for knitting said hose on a circular warp knitting machine to form a cuff, and according to the invention, a continuous tubular strip is knitted with two warp threads, said strip consisting of a number of continuous filtration hoses. , each hose has sections of the hose hollow body, which sections are knitted in a conventional manner with two warp threads, alternating with sections knitted with one thread thread, and partially doubled. , forming a circular hollow part whose ends are separated by warp threads of the other series, said warp threads of the other series being attached as intermediate strips, after which a bead is knitted with the threads of one series, which bead is knitted in a conventional manner. While being overlapped and attached to the loop structure of the hose body, two systems of yarn are knitted into a warp knitted fabric in the shape of a certain length of end portion, and the boundary portion is knitted with one system of yarn at the front and rear end portions of the hose. The interface divides the continuous tubular strip into separate filtration hoses.

This method of knitting filtration hoses makes it possible to produce filtration hoses in one step using a circular warp knitting machine, ready for use immediately after being divided into separate pieces at the borders of the hose strips. Further, according to this method, there is no need to sew the joints of the hose or the ends of the hose, and the warp knitted fabric is not unknitted, thereby preventing unknitting when there is no cuff part.

The loop structure of the tubular warp knitted filtration hose is made using two lines of thermoplastic yarn; one line of thermoplastic warp yarn uses a complex yarn that knits loop rows in a chain formation, and the other line of thermoplastic yarn uses a complex yarn that knits loop rows in a chain formation. A textured yarn is used in which the loop rows are knitted in a conductive tricot texture, and the knitted back hose is heat treated at an appropriate temperature to shrink the yarn.

The complex chain structure of the yarn improves the shape retention and longitudinal strength of the hose, while the tricot structure of the textured yarn allows the loop structure of the hose to be filled with fibers to form a porous microstructure. do. The use of thermoplastic threads in the structure and heat treating the finished hose at temperatures that cause the threads to shrink increases the density and strength of the loop structure, as well as reducing the size of the filtration ports.
These features make gas purification by the filter hose even more effective.

Thus, the tubular warp knitted filtration hose practically does not expand, there is no dissociation of the loop structure, and the longitudinal and circumferential strength is uniform, while the loop structure has considerable elasticity and There is no Hikyu strain.

In order to better understand the invention, embodiments of the invention will now be described in detail with reference to the accompanying drawings.

According to the invention, the well-known tubular warp knitted fabric A produced on a circular knitting machine is used as a filter hose 1 (see FIG. 1). Such hoses are used in many industrial fields as filters to clean minute gases and air, and are also used as exterior coverings for drain pipes. Such hoses have great strength and elasticity, have no longitudinal joints, are convenient to use, and can withstand fairly high pressures of air or gas.

The filter hose 1 has a hollow body 2 with an open end 3 . One or both of the open ends 3 are folded back and attached to the hollow body 2 to form a cuff 4.

The hollow body 2 of the hose is essentially a tubular warp knitted fabric A made with two warp threads on a conventional circular warp knitting machine.

The cuff of the open end (see Figure 2) is made as a double bead 5 (as is known from the manufacture of stockings), which is knitted in one warp thread and connected to the hose body by the other warp thread. The warp yarns of the other systems are knitted into the loop structure of the hose body fabric.

The cuff portion 4 further has a warp knitted fabric portion 6,
This warp knitted section is made of two warp yarns and is positioned parallel to the double bead on the outside or inside of the filter hose. The length L of this part 6 of the cuff 4 is not less than the length L ₁ of the double bead 5.
This part 6 is a well-known end part formed by a circular knitting machine at the beginning or end of knitting. This end section makes it possible to considerably strengthen the cuff, ie the part of the filter hose which is attached to the connection in a known manner.

The filtration hose is reinforced to prevent the walls of the filtration hose from sticking together and to quickly clean dust and particles from the inside of the hose.

This reinforcement is shown in Figures 3 and 4.
or by other conventionally known methods.

According to FIG. 3, the hose hollow body 2 made of tubular warp knitted fabric has on its outside a circular hollow part 7 for accommodating the filler material.

These circular hollow portions 7 are spaced apart at a constant length and, unlike the other portions of the hollow body 2, are knitted with one line of yarn. The circular hollow part 7 is held inside the hose body by the warp yarns of the ground system, these other warp yarns being arranged as intermediate strips 8. These intermediate strips 8 connect adjacent parts 9 of the warp knitted fabric of the hollow body 2 and hold the ends of the hollow hollow parts 7 of equal length and spaced apart.

Rigid split ring member 1 in each circular hollow portion 7
0 (Figures 3 and 5) is used as a filter. The length of the intermediate strip 8 is equal to the length of the split ring member 10.
is selected such that it is easily introduced into the circular hollow part 7.

According to Figure 4, to reinforce the filtration hose,
The hard loose material 11 may be introduced into the circular hollow portion 7. Both the split ring member 10 and the hard loose material 11 can be attached to the circular hollow part 7 (this reinforcing method is not shown in the drawings).
Foreign matter obtained by filtration may be used as the loose material 11.

The filtration hose 1 of the present invention is knitted using a well-known circular warp knitting machine (not shown). In this knitting machine, a continuous tubular strip 12 (FIG. 6) is knitted in a conventional manner with two systems of warp yarns, and this tubular strip has a boundary portion 1
It consists of various continuous filtration hoses separated from each other by 3. This continuous tubular strip 12 is cut at a border 13 to divide it into separate hoses.

In the knitting process of the continuous tubular band 12, the hose hollow body 2 of each filtration hose 1 is knitted with two systems of warp yarns, and then the beads 5 are knitted with one system of warp yarns,
The bead 5 is then doubled in a conventional manner and attached to the loop structure of the hollow body 2, while
A cloth having an end portion 6a of a certain length is knitted using two lines of yarn, and the end portion forms the other portion 6 of the cuff portion 4. The boundary portion 13 is knitted with one line of yarn between the front and rear end portions 6a of the hose.

The length of the end portion 6a (FIGS. 1 and 6) is determined according to the purpose, i.e., if the end portion 6a only protects the unknitted part, it should have 4 to 6 rows; Part 4 (Figures 2 to 4)
If the other part 6 of FIG.
The length of the double bead L must be no shorter than ₁ .

If the filter hose is later reinforced, the circular hollow section 7 (FIG. 6) is made in a conventional hose knitting process.

In each filtration hose 1, the hollow body part 9 has two
The warp yarns of one strain are knitted, alternating with sections knitted with warp yarns of one strain, partially doubled,
A circular hollow part 7 is formed, the ends of which are threaded with warp yarns of other systems, which warp yarns are attached as intermediate strips 8.

An example of knitting a well-known warp knitted fabric using two systems of warp yarns is shown in FIG. Knitted fabric A is knitted with thermoplastic yarn. One system of thermoplastic warp yarns uses a complex yarn 14 in which loop rows are knitted in a chain texture, and the other system of thermoplastic warp yarns uses a textured yarn 15 in which loop rows are knitted in an induced tricot texture. After being knitted with these yarns, the filtration hose is heat treated at a temperature necessary for yarn shrinkage.

Shrinkage reduces the loop size while improving strength, shape retention ability and microporosity.

The filter hose cuff 4 (FIG. 2) is placed on the filter inlet connection 16 and secured with a clamp 17.

Since the cuff part 4 is made in the shape of a double bead 5,
Due to the flexible tightening, the attachment to the connection part 16 does not cause damage.

The other end of the hose is attached in a similar manner. It is attached to the disk of a conventional tightening device and fixed with a clamp.

Dirty gas is fed into the filter hose and passes through the hollow body 2, and dust particles accumulate on the inner surface of the filter hose body 2.

When the cuff part 4 of the hose has another part 6, the double bead of the cuff part 4 and the other part 6 are attached to the connection part and fixed with a clamp. The other end of the filtration hose is secured with a tightening device in a similar manner.

Before attaching to the filter, insert the circular hollow part 7.
(Fig. 3) The filtration hose has split ring member 1.
0 (Figure 3).

The split ring member 10 is attached to the circular hollow part 7 between the intermediate strips 8. Once the filtration hose has been reinforced, the cuff 4 is secured to the filter in a conventional manner.

Dirty gas is sent into the filtration hose and
It passes through a section 9 of the hollow body 2 made of warp yarns of the same type, said section 9 being provided between reinforcing circular hollow sections 7. The trapped dust accumulates on the inner surface of the portion 9 of the hollow body 2.

To remove the trapped dust, the parts 9 of the hollow body 2 are vibrated by backpurging the filter, but these parts do not stick. During back purge, rigid split ring member 10
supports the circular hollow parts 7 and prevents the parts 9 of the hollow body 2 from adhering to them.

Filtration hose 1 (fourth
Figure) is reinforced with loose material 11 before the filter is activated. For this purpose, the filter hose is fixed to the filter or to a special stand by means of the cuff 4. Gas containing loose material is blown out of the hose. Since the hydraulic resistance of the knitted fabric structure forming the circular hollow part 7 is smaller than the hydraulic resistance of the part 9 of the hollow body 2, the main filtration flow passes through the surface of the circular hollow part 7, and the loose material 11 passes through the intermediate strip 8. It passes through the gap and is deposited inside the circular hollow part 7. As the circular hollow parts 7 are filled, their hydraulic resistance increases and becomes equal to the hydraulic resistance of the part 9 of the hollow body 2. The filtration hose is then used for gas filtration, as described above.

The dust collected by the filter is used as loose material. Therefore, the filter hose with the empty hollow part 7 is attached directly to the filter and the filter is activated.

[Brief explanation of drawings]

Figure 1 shows a filtration hose with a double cuff at the end, Figure 2 is a longitudinal section of the filtration hose with one end fixed, and Figure 3 is a longitudinal section of the filtration hose reinforced with a rigid split ring member. 4 is a vertical cross-sectional view of a filter hose reinforced with loose material, FIG. 5 shows a split ring member, and FIG. 6 is a partial view of a continuous filtration hose manufactured by a circular warp knitting machine. FIG. 7 shows an example of a loop structure of a tubular filtration hose. In the symbols shown in the drawings, 1... filtration hose,
2...Hollow hose body, 4...Cuff section, 5...Double bead, 6...Other parts, 6a...End part, 7
... Circular hollow part, 8 ... Intermediate strip, 9 ... Hollow hose body part, 10 ... Split ring member, 12 ...
...Tubular band, 13...Boundary part, 14...Complicated thread, 15...Textured thread.

Claims (1)

[Claims] 1. A filtration hose 1 using a tubular warp knitted fabric manufactured by a circular warp knitting machine. 2. In a filtration hose in which the hollow body is made of thread and has an open end, at least one of these open ends is folded back and attached to the hose body to form a cuff part, the hose hollow body 2 is essentially Basically, it is a tubular warp knitted fabric made using two warp yarns on a circular warp knitting machine, while the cuff 4 at the open end of the hose is knitted with one warp yarn and knitted with the other warp yarn. A filtration hose characterized in that it is made as a double bead 5 connected to the hose hollow body 2, and the warp yarns of the other systems are woven into a loop structure of the hose body cloth. 3 The cuff part 4 has another warp knitted fabric part 6 made of two warp yarns and positioned parallel to the double bead 5, and the length of the part 6 of this cuff part 4 is equal to the length of the double bead 5. 2. A filtration hose according to claim 2, having a length not less than . 4. In a filtration hose in which the hollow body is made of thread and has open ends, at least one of which is folded back and attached to the hose body to form a cuff part, the hose hollow body 2 is essentially Generally speaking, it is a tubular warp knitted fabric made using two warp yarn systems using a circular warp knitting machine, while the cuff section 4 at the open end of the hose is knitted using one system of warp yarns and is knitted with warp yarns of another system. The warp yarns of the other systems are knitted into the loop structure of the hose body fabric, and the hose hollow body 2 made of tubular warp knitted fabric is made as a double bead 5 connected to the hose hollow body 2. It has circular hollow parts 7 at regular intervals on the outside, and these parts 7 are knitted with one system of yarn and held inside the hose body by warp yarns of another system,
The warp yarns of said other systems are arranged as intermediate strips 8 arranged to connect adjacent parts of the warp fabric of the hose body and to hold the ends of the circular hollow parts 7 spaced by the same length. and inside each circular hollow part 7 there is provided a starch material forming a reinforcing rib, the length of the intermediate strip being selected to ensure that the starch material is introduced into the circular hollow part. Characteristic filtration hose. 5. The filter hose according to claim 4, wherein the split ring member 10 is used as a filler material. 6. The filtration hose according to claim 4, wherein the hard loose material 11 is used as a filler material in each circular hollow portion 7. 7 A filtration hose in which the hollow body is made of thread and has an open end, at least one of which is folded back and attached to the hose body to form a cuff part, the hose hollow body 2 is essentially a tubular warp fabric made with two warp yarns on a circular warp knitting machine, while the cuff 4 at the open end of the hose is knitted with one warp yarn and one warp yarn of the other. The hose hollow body made of tubular warp knitted fabric is made as a double bead 5 connected to the hose hollow body 2 by warp yarns, and the warp yarns of the other systems are woven into the loop structure of the hose body fabric. 2 has circular hollow parts 7 at regular length intervals on the outside thereof, and these parts 7 are knitted with one system of yarn and held inside the hose body by warp yarns of another system,
The warp yarns of said other systems are arranged as intermediate strips 8 arranged to connect adjacent parts of the warp fabric of the hose body and to hold the ends of the circular hollow parts 7 spaced by the same length. and provided inside each circular hollow part 7 with filler material forming reinforcing ribs, the length of the intermediate strip being selected to ensure that the filler material is introduced into the circular hollow part. In a method for manufacturing a filtration hose using a circular warp knitting machine, a continuous tubular band 12 made of a warp knitted fabric with two warp yarns is knitted by the circular warp knitting machine, and the band has a large number of continuous filtration hoses. Consisting of hoses 1, each hose has sections 9 of the hose hollow body, which sections 9 are knitted in a conventional manner with two warp threads, alternating with sections knitted with one thread thread and partially are doubled to form a circular hollow part whose ends are separated by warp threads of the other series, said warp threads of the other series being attached as hollow strips 8, after which beads 5 are knitted with the threads of one series, This bead is doubled in the conventional procedure and attached to the loop structure of the hose body, while a warp knitted fabric with a constant length of end portion 6a is knitted using two lines of yarn, and the boundary portion 13 is attached to the front and rear hoses. A method as described above, characterized in that the continuous tubular strip 12 is knitted with one line of yarn between the end portions 6a of the hose, and this boundary portion divides the continuous tubular strip 12 into separate filtration hoses 1. 8 In the warp knitting of the filtration hose 1, two systems of thermoplastic systems are used, one system of thermoplastic warp yarns is a complex yarn 14 that knits loop rows in a chain formation.
In other thermoplastic systems, a textured system is used in which the loop rows are knitted in an induction tri-unit formation, and the knitted rear hose is heat treated at an appropriate temperature to shrink the yarn. The method described in paragraph 7.