CN115501699A - Dust removal filter bag with inner plugging pin hole - Google Patents

Abstract

The technology of this case provides a dust-removing filter bag with internally blocked pinholes. Its main feature is that for the pinholes (12) of the filter bag in the filter area, part or all of the inside of the filter bag is provided with a sealing covering layer (7) to block the pinholes, so as to block the existing cloth seams (15) and The purpose of the pinhole (12) dust leakage passage has improved the dust removal efficiency.

Description

A kind of inner plugging pinhole dust removal filter bag

technical field

The invention relates to a dust-removing filter bag with sewing pinholes sealed inside the filter bag, and belongs to the field of environmental-friendly bag-type dust removal.

Background technique

The core component used in the bag filter, the filter bag, is generally composed of bag body filter material (4), expansion ring cloth (3), bag bottom cloth (13), and reinforcement layer cloth (8). become. Except that the filter material of a few varieties and a small number of positions can be connected by heat fusion, the multiple pieces of cloth all need to be connected by sewing. Moreover, its connection parts are all in the filter area, and the cloth seams (15) and pinholes (12) produced by the sewing connection form four kinds of dust leakage channels, as shown in Figure 3 ①-① to ④-④, which are extremely large. affect the dust removal efficiency. In order to further improve the dust removal efficiency of the bag filter, the direction of research and development in recent years has mainly focused on two aspects: On the one hand, the research and development of filter materials with higher dust removal efficiency, such as microfiber, PTFE membrane, etc., have achieved remarkable research and development results. It has been widely used in industry. After a large number of dynamic monitoring, for most working conditions, the general film-coated filter material can achieve an emission concentration of ≤0.1mg/Nm3. On the other hand, the dust leakage caused by the cloth seams (15) and pinholes (12) produced in the process of making the filter bag from the filter material is researched and developed. One is as shown in Figure 2 and Figure 4, use PTFE sealing strip (11) to cover the cloth seam (15) and pinhole (12) together, but due to the fatigue damage effect of the expansion and contraction force, the sealing strip (11) is in the Fracture occurs after using for a period of time, and the effect of the cover cloth seam (15) cannot be completed. And because of the bag bottom position can't paste PTFE seal (11), still do not have the product of bag bottom cloth seam (15) paste seal (11) at present. The 2nd, as shown in Figure 2 and Figure 5, smear the side seam of plugging cloth seam (15) and the outer surface of pinhole (12) with sealant (6), but because cloth seam (15) side seam place The glue that is coated is easy to crack when cleaning dust and blowing back, and also has the cloth seam (15) of many positions to be difficult to implement glue coating, if must be coated with, not only influence production efficiency, also can't reliably block. Therefore present product generally does not coat seam (15) and only coats surface pinhole (12), as shown in Figure 6.

Contents of the invention

The technology of this case is the connection of the bag body filter material (4), expansion ring (1), clip strip (2), bag bottom cloth (13), expansion ring wrapping cloth (3) and reinforcement layer cloth (8) in the prior art On the basis of the scheme (that is, regardless of the flat bag or the pleated bag, the sewing connection part of the expanded loop cloth (3) covered with the expanded loop (1) and the clip (2) and the bag body filter material (4) is in the filter area And the bottom of the bag bottom cloth (13) and the bottom of the bag body filter material (4) and the reinforcing layer cloth (8) thereon are sewed to form the traditional craft type at the bottom of the bag, as shown in Figure 1; 1), the sewing connection between the expansion loop wrapping cloth (3) of the card strip (2) and the filter material (4) of the bag body is in the clean air room area and the bottom of the bag is a new technology type in the form of a buckle (9) , as shown in Figure 9), for the pinholes (12) in the filter area, part or all of the inside of the filter bag is provided with a sealing covering layer for blocking the pinholes (12), so as to reach the sealing cloth seam (15) and The purpose of the pinhole (12) dust leakage channel. And this scheme does not exist in the filter bag folding, transportation, installation and use (jet cleaning), the problem that the edge sealant (6) or seal (11) of the cloth seam (15) is very easy to crack.

The sealing covering layer can be internally applied sealant (7) or internally applied seal (11). The kind of described sealant (7), the method of smearing are the same as the existing process of applying glue on the outside; the seal can be a PTFE seal (11), and its performance, specifications and method of application are the same as those of the prior art on the outside. The process of applying the PTFE seal (11) is the same.

When adopting the technique of internally coating sealant (7), immediately cover the protective film (14) on the surface of wet glue marks while applying sealant. Since it takes a period of time for the sealant (7) to dry completely, generally 12-48 hours, the protective film (14) can prevent the sealant (7) that is not completely dry from falling off and failing, and even stick the inside of the filter bag to death. The filter bag cannot be used. This process of covering the protective film has been used in the production of the middle seam front glue, and the method is simple and reliable. For the technology in this case, it is necessary to use special patented equipment for production, that is, to carry out technical transformation and upgrading of the existing technology production line equipment. Described protective film (14) can be the material of various impervious sealants such as polyethylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, thin paper strip. If the working conditions are harsh, the protective film (14) can be selected from materials that can volatilize and self-extinguish under the working conditions of the filter bag, but it should be noted that the volatilization and self-extinguishing process will not cause secondary pollution.

As shown in Figure 3, although the channels ③-③, that is, the pure cloth slit channel, have a very low dust leakage weight, but for the working conditions where the dust particle size is extremely fine or the filtration accuracy is extremely high, it is not possible to block this channel. The channel can be between the two faces of the two layers of filter materials that are sewn together, that is, in the channel ③-③, and between any two rows of sewing stitches, a sealant (10) is applied, as shown in the figure 2 and Figure 8. For the cloth seam (15) of the middle seam, it can be between any two sewing stitches, and the cloth seam (15) between the outer overlapping filter material (4-a) and the inner overlapping filter material (4-b) ) position is coated with sealant (10), to block pure cloth seam ash leakage. The sealant cannot touch the suture (5) and the pinhole (12), so as to ensure that the thread jumping phenomenon of the sewing process will not be caused, and it is necessary to use special patented equipment for production to ensure quality and production efficiency.

Further, when the reinforcing layer cloth (8) is built in, as shown in Figure 9, the internally applied sealant (7) can be applied between the bag body filter material (4) and the reinforcing layer cloth (8), close to the seam (5).

On the basis of any combination of the above-mentioned technical solutions, any pinhole (12) in the filter area can be blocked from the outside, that is, on the outer surface of the filter bag, the pinhole (12) on it, or the pinhole ( 12) Apply sealant (6) to the cloth seam (15), as shown in Figure 7, or apply a PTFE seal (11). That is to combine the prior art solutions into the technology of this case.

The dust removal industry is working hard on research and development, hoping that bag filter products can have lower emissions. A dust removal project often has thousands or even tens of thousands of filter bags working at the same time. According to the existing technology, each filter bag has 7-10 meters of cloth seams (15) and thousands of pinholes (12) to leak dust, and the impact on dust removal efficiency cannot be ignored. This technical solution not only completely solves all leaks Gray channel, and does not increase the cost, the process is basically unchanged, the scheme is simple, practical and reliable.

Description of drawings

The present invention has 10 pages of accompanying drawings, totally 10 pieces:

Figure 1 is a schematic diagram of the filter bag structure and the inner and outer sealing covering layers

Figure 2 is a sectional view of Figure 1A-A

Figure 3 is a schematic diagram of four kinds of dust leakage channels produced by sewing

Fig. 4 is a schematic diagram of the structure of a PTFE seal in the prior art partially enlarged in Fig. 2

Fig. 5 is a partially enlarged schematic diagram of the prior art surface gluing plus side gluing structure in Fig. 2

Fig. 6 is a schematic diagram of the partially enlarged structure of Fig. 2 in the prior art with only surface coating

Figure 7 is a partially enlarged schematic diagram of the combination structure of the inside and outside of the technology in Figure 2

Figure 8 is a partial enlarged schematic diagram of the combined structure of inner and outer gluing plus cloth seam gluing in the technology of this case

Figure 9 is a schematic diagram of the inner glue coating structure of the buckle bag bottom type filter bag reinforcement layer

Fig. 10 is the schematic diagram of embodiment 1 filter bag structure

1-Expansion ring 2-Clip 3-Expansion ring cloth 4-Bag body filter material 4a-Outer lap joint filter material 4b-Inner lap joint filter material 5-Sewing thread 6-Outer sealant 7-Inner sealant 7a- Bag mouth sewing inner sealant 7b-bag bottom reinforcement layer inner sealant 7c-middle seam inner sealant 8-reinforcement layer cloth 9-buckle 10-sealing sealant between stitches in cloth seam 11-PTFE seal 12-pinhole 13-bag Base fabric 14-protective film 15-cloth seam

detailed description

Example 1

As shown in Figure 10, the material of the filter material is 550g/m2 polyester-coated needle-punched felt, which is sewn into a cylindrical bag body. Make circular bag bottom cloth 13 with same material, short tubular reinforcing layer cloth 8, short tubular expanding ring wrapping cloth 3. The expansion ring wrapping cloth 3 wraps the expansion ring 1 and the clip 2, and the dimensions, manufacturing requirements, connection methods and the outer sealant 6 of all the above components are the same as those of the prior art. In the bag body filter material 4 inboards, the inner surface of the sewing thread 5 corresponding to the expander cloth 3 and the bag body filter material 4 is coated with a sealant 7a to block the pinholes. Apply sealant 7c at the corresponding pinhole 12 places on the inwall of the middle seam 15, stick protective film 14 on the adhesive surface immediately after gluing, protective film 14 selects PE material for use, thickness 0.03mm, wide 40mm. The inner glue 7c and the sticking protective film 14 of the cloth seam 15 of the middle seam are completed using special patented equipment. The reinforcement layer cloth 8 is enclosed within the outside of bag body filter material 4, makes its bottom edge align, and then the upper edge of reinforcement layer 8 is sewed together with bag body filter material 4. In the gap formed by the outer wall of the tubular bag body and the inner wall of the reinforcing layer cloth 8, sealant 7b is applied close to the upper edge of the sewing position. The kind of sealant 7a, 7b, 7c is identical with the sealant 6 that the prior art outside smears, and the thickness of smearing is also identical. Finally, the lower peripheral sewing of bag bottom cloth 13 and bag body filter material 4 and reinforcing layer cloth 8 is connected. Finally, on the outer surface of the tubular bag body, apply sealant 6 to the pinhole 12 positions that are produced by the above-mentioned sewing connection, and then complete the making of the filter bag.

Claims (6)

1. A kind of inner plugging pinhole dust removal filter bag, comprising the filter material (4), expansion ring (1), clamp strip (2), bag bottom cloth (13) or buckle (9), or The possible pocket expansion loop cloth (3) and bag bottom reinforcement layer cloth (8) are characterized in that: for the sewing needle holes (12) in the filter area, part or all of them are provided with sealing needles inside the filter bag Sealing cover for hole (12). 2. A kind of inner plugging pinhole dust filter bag as claimed in claim 1, characterized in that: the sealing cover layer can be coated with sealant (7), and can also be a sticking seal, and the seal can be a PTFE seal (11). 3. A kind of internally blocked pinhole dust filter bag as claimed in claim 2, characterized in that: when the sealant (7) is applied, the protective film (14) is immediately covered on the surface of the undried glue trace. 4. A kind of internal plugging pinhole dust removal filter bag as claimed in claim 3, is characterized in that: described protective film (14) can be polyethylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene , Thin paper strips and other impermeable sealant materials. 5. A dust-removing filter bag with internally blocked pinholes as claimed in claim 1, characterized in that: between the two surfaces of the two layers of filter materials that are sewn together, and at the same time any two rows of sewing needles Between traces, apply sealant (10). 6. A dust removal filter bag with internally blocked pinholes as claimed in claim 1, 2, 3, 4, 5, characterized in that: apply sealant (6) or paste on the pinholes on the outer surface of the filter bag seal (11).

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