Joint welding structure of metal filter bag

Abstract

According to the connector welding structure of the metal filter bag, the metal filter bag is formed by connecting at least two filter bag sections, and each filter bag section is formed by welding at least two porous pipes; a first joint is welded at the end part of one filter bag section between every two connected filter bag sections, a second joint which can be movably connected with the first joint is arranged at the end part of the other filter bag section, the end head, welded with the hole pipe, in the first joint is defined as a first end head, and a conical surface which is gradually thickened from the end part to the inside is formed on the circumferential surface of the first end head; the first end head is inserted into the end part of the hole pipe and is gradually jacked for welding; the end, welded to the hole pipe, in the second connector is defined as a second end, one end of the hole pipe forms a necking section to be inserted into the second end, and a thin-wall welding section with the thickness smaller than that of the second connector is formed at the position, on the outer side of the necking section, of the end of the circumferential face of the second end. According to the utility model, the welding efficiency of the filter bag can be greatly improved, and the processing cost is reduced.

Description

Technical Field

[0001] The utility model relates to a metal filter bag, and more specifically to a joint welding structure of a metal filter bag. Background Art

[0002] Generally, high-temperature resistant metal filter bags are made of metal fibers or metal powders, which are pressed and sintered into intermetallic compound porous filter materials, and then processed by welding into the form of filter bags. The metal film has the characteristics of high temperature resistance, strong acid and alkali resistance, high mechanical strength, and certain flexibility, solving the problem of high-precision interception of dust particles in high-temperature industrial flue gas, and is an ideal high-temperature flue gas dust removal material. In industrial scale production, the amount of flue gas discharged is relatively large, so there are naturally more metal filter bags for dust removal, and the dust removal tower is relatively large, with a height of more than 10 meters. The filter bags are relatively long, generally 5-7.5 meters long, and all the filter bags are installed vertically, making the installation relatively cumbersome. In order to reduce the difficulty of processing, transporting and installing the filter bags, usually the filter bags over 7 meters are made into two sections, divided into the upper section and the lower section, and some are also composed of three sections combined, and then connected and installed on site. Each section of the filter bag can also be composed of multiple sections of hole tubes welded together. The upper section or the lower section is connected to each other by welding an upper joint. Welding is one of the main links in the manufacturing process, with a large workload and a long time-consuming. Therefore, improving efficiency and reducing costs are urgent problems to be solved.

[0003] When installing the metal filter bags between two sections, generally a threaded connection method is adopted between the two sections of metal filter bags, and corresponding threaded joints need to be welded on the hole tubes of the filter bags for threaded connection. Figure 1 、 Figure 2 As shown in

[0004] , in the traditional metal filter bag, the upper section is welded to the external threaded joint 1', and the lower section is welded to the internal threaded joint 2'. The end parts of the hole tube 3' are respectively inserted into the end parts of the external threaded joint 1' or the internal threaded joint 2' for welding.

[0005] Therefore, in the (threaded) connection structure of the metal filter bag, due to the above reasons, there are many inconveniences in the welding of the metal filter bag and the joint, and automatic welding cannot be achieved, resulting in a significant reduction in work efficiency. This case thus arises. Summary of the Invention

[0006] The purpose of the present invention is to provide a joint welding structure for a metal filter bag, which can greatly improve the welding efficiency of the filter bag and reduce the processing cost.

[0007] To achieve the above purpose, the solution of the present invention is:

[0008] A joint welding structure for a metal filter bag, the metal filter bag is formed by connecting at least two filter bag segments, and each filter bag segment includes at least two hole tubes welded together; between two connected filter bag segments, a first joint is welded to the end of one filter bag segment, and a second joint that can form a movable connection with the first joint is provided at the end of the other filter bag segment. The end of the first joint welded to the hole tube is defined as the first end, and a conical surface that gradually thickens from the end inward is formed on the circumferential surface of the first end. After the first end is inserted into the end of the hole tube and gradually tightened, welding is performed; the end of the second joint welded to the hole tube is defined as the second end, and a reduced-diameter section is formed at one end of the hole tube and inserted into the second end. A thin-wall welding section with a thickness less than the thickness of the second joint is formed on the circumferential surface of the second end outside the reduced-diameter section.

[0009] Further, a first inclined surface that slopes forward and downward is formed on the circumferential surface of the first end in the direction of inserting into the hole tube; the thin-wall welding section includes a second inclined surface that slopes forward and downward on the circumferential surface of the second end in the direction of inserting the hole tube, and a thin-wall section with a thickness less than the thickness of the second joint is formed at the front end of the second inclined surface.

[0010] Further, a conical surface that gradually thickens from the end inward is formed on the circumferential surface of the second end, and a connection section with a relatively thin thickness is formed at the end of the second end facing the hole tube for welding with the inserted reduced-diameter section.

[0011] Further, a threaded connection is formed between the first joint and the second joint. An external thread is provided on the outer wall of the first joint behind the first end, and an internal thread is provided on the inner wall of the second joint behind the second end.

[0012] Further, in each filter bag segment, welding is performed after docking between the ends of two adjacent hole tubes. A reduced-diameter section is formed by inward contraction of one end of the hole tube and can be inserted and clamped into the end of the other hole tube. Welding is performed at the part where the reduced-diameter section abuts against the end of the other hole tube, or the reduced-diameter section is inserted into the second end of the second joint.

[0013] Further, the necking section includes an inclined transition section formed inwardly at one end of the hole tube and then an inwardly constricted section, and the inwardly constricted section is stuck inside the end of another hole tube.

[0014] After adopting the above structure, the utility model improves the welding structure of the hole tube and the joint. The first end of the first joint welded to the hole tube is processed into a conical surface. The gradually expanding conical surface structure can expand the deformed hole tube into a circular shape, and the contact surface gap between the first end and the end of the hole tube is very small. During welding, laser welding without filler wire can be directly used, thus improving the welding efficiency and reducing the welding cost. In the second end of the second joint that is welded to the end of the hole tube, the end of the hole tube forms a necking section and is inserted into the second end for a tight fit. At the end of the circumferential surface of the second end, a thin-walled welding section with a thickness less than that of the second joint is formed outside the necking section. During laser welding, the thin-walled welding section at the end of the second end is melted, and it is easier to melt this part of the wall thickness to fill the weld seam, which can also improve the welding efficiency and reduce the welding cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the butt joint of two filter bags in the prior art;

[0016] Figure 2 is Figure 1 a partial enlarged view of part A in

[0017] Figure 3 is a schematic structural diagram of the butt joint of two filter bags of the present utility model;

[0018] Figure 4 is a schematic structural diagram of the two filter bags of the present utility model disassembled;

[0019] Figure 5 is Figure 3 a schematic cross-sectional structure diagram of

[0020] Figure 6 is Figure 5 a partial enlarged view of part B in

[0021] Figure 7 is Figure 5 a partial enlarged view of part C in

[0022] Figure 8 is a disassembled schematic diagram (showing the cross-section) between the first joint and the hole tube of the present utility model;

[0023] Figure 9 is a disassembled schematic diagram (showing the cross-section) between the second joint and the hole tube of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0024] To further explain the technical solution of the present utility model, the present utility model will be elaborated in detail through specific embodiments below.

[0025] Combined with Figure 3 、 Figure 4 As shown, the present utility model discloses a joint welding structure of a metal filter bag. The metal filter bag is formed by connecting at least two filter bag segments a. Each filter bag segment a includes at least two pore tubes welded together. In this embodiment, each filter bag segment a includes two pore tubes 1 welded together. Between two adjacent filter bag segments a, a first joint 2 is welded to the end of one filter bag segment, and a second joint 3 that can form a movable connection with the first joint 2 is provided at the end of the other filter bag segment. In this embodiment, a threaded connection is formed between the first joint 2 and the second joint 3. An external thread 21 can be provided on the outer wall of the first joint 2, and an internal thread 31 is provided on the inner wall of the second joint 3. When installing the metal filter bag, the first joint 2 and the second joint 3 can be directly rotated relative to each other to form a screw connection.

[0026] To better weld the first joint 2 or the second joint 3 to the end of the pore tube 1, improve the welding efficiency and reduce the welding cost, combined with Figures 4 to 9 As shown, in the present utility model, the end of the first joint 2 that is welded to the pore tube 1 is defined as the first end 22, and the end of the second joint 3 that is welded to the pore tube 1 is defined as the second end 32. When the first end 22 is welded to the end of the pore tube 1, the first end 22 can be inserted into the end of the pore tube 1 for welding. When the second end 32 is welded to the end of the pore tube 1, the end of the pore tube 1 can be inserted into the second end 32 for welding.

[0027] In the present utility model, in the first joint 2, the circumferential surface of the first end 22 is formed into a tapered surface that gradually thickens from the end inward, so that the first end 22 can be inserted into the end of the pore tube 1 and gradually tightened and rounded (the fitting gap is greatly reduced) for welding. In the second joint 3, one end of the pore tube 1 forms a reduced diameter section 11 and is inserted into the second end 32. A thin wall welding section with a thickness less than the thickness of the second joint is formed on the outer side of the reduced diameter section 11 at the end of the circumferential surface of the second end 32, so that the second end 32 can be more easily welded to the pore tube 1.

[0028] Combined with Figure 6 、 Figure 8 、 Figure 9As shown, the external thread 21 provided on the outer wall of the first joint 2 is located behind the first end 22. A first inclined surface 221 that slopes forward and downward is formed on the circumferential surface of the first end 22 in the direction towards the insertion hole pipe 1. An internal thread 31 is provided on the inner wall of the second joint 32 and is located behind the second end 32. The thin-wall welding section includes a second inclined surface 321 that slopes forward and downward on the circumferential surface of the second end 32 in the direction of insertion of the hole pipe 1, and a thin-wall section 322 with a thickness less than that of the second joint is formed at the front end of the second inclined surface 321. Of course, the circumferential surface of the second end 22 can be directly formed into a tapered surface that gradually thickens from the end, so that the end of the second end towards the hole pipe forms a connection section with a relatively thin thickness, making it easier to weld with the inserted reduced-diameter section.

[0029] Combined Figures 4 to 7 As shown, in each filter bag section a, welding is formed between the ends of two adjacent hole pipes 1 after docking. One end of the hole pipe 1 can be internally contracted to form a reduced-diameter section 11 that can be inserted and clamped into the end of the other hole pipe. The welded part is formed at the position where the reduced-diameter section 11 abuts against the end of the other hole pipe 1. Alternatively, the reduced-diameter section 11 can also be inserted into the second end 32 of the second joint 3, which facilitates welding the hole pipe 1 to the inside of another hole pipe or welding the second joint 3 to the end of the hole pipe 1. The reduced-diameter section 11 includes an inclined transition section 111 formed by inwardly forming at one end of the hole pipe 1 and then an internally contracted section 112. The internally contracted section 112 is clamped inside the end of the other hole pipe 1. The inclined transition section 111 can be welded to the end point of the other hole pipe 1, or the thin-wall section 322 on the second end 32 abuts against the inclined transition section 111 to achieve welding.

[0030] After adopting the above structure, the utility model improves the welding structure between the hole pipe and the joint. The external screw welding part is designed as an inverse insertion type. The welding end of the first joint 2 with an external thread, that is, the first end 22, is processed into a tapered surface, which can be conveniently inserted into the hole pipe 1 step by step. Even if the hole pipe is elliptical, it will not affect the operation. The gradually expanding tapered structure can expand the deformed hole pipe into a circular shape. Due to the gradually expanding tapered surface structure, the contact surface gap between the first end and the end of the hole pipe is very small. During welding, laser welding without filler wire can be directly used, which conveniently realizes automatic welding, greatly improves the welding efficiency, and reduces the welding cost. For the second joint 3 with an internal thread, in the second end 32 where it is welded to the end of the hole pipe, the end of the hole pipe forms a reduced-diameter section and is inserted into the second end 32. Since a thin-wall welding section with a thickness less than that of the second joint is formed at the end of the circumferential surface of the second end 32 outside the reduced-diameter section 11, when externally tightened, the reduced-diameter section 11 of the hole pipe is tightly fitted into the second joint 32. During laser welding, the thin-wall welding section at the end of the second end 32 (about 3 mm long) is melted. The structure of the welded part is processed into a thin wall with a relatively thin thickness, and it is very easy to melt this part of the wall thickness by laser to fill the weld seam, thereby also improving the welding efficiency and reducing the welding cost.

[0031] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the art shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. A joint welding structure for a metal filter bag, the metal filter bag being formed by connecting at least two filter bag segments, each filter bag segment including at least two pore tubes welded together; between two connected filter bag segments, a first joint is welded to the end of one filter bag segment, and a second joint capable of forming a movable connection with the first joint is provided at the end of the other filter bag segment, characterized in that: The end of the first joint that is welded to the orifice tube is defined as the first end. The circumferential surface of the first end forms a conical surface that gradually thickens inward from the end. After the first end is inserted into the end of the orifice tube and gradually tightened, welding is carried out. The end of the second joint that is welded to the orifice tube is defined as the second end. One end of the orifice tube forms a reduced-diameter section that is inserted into the second end. The end of the circumferential surface of the second end forms a thin-walled welding section with a thickness less than the thickness of the second joint on the outside of the reduced-diameter section.

2. The joint welding structure of a metal filter bag according to claim 1, characterized in that: In the circumferential surface of the first end, a first inclined surface that slopes forward and downward is formed in the direction of inserting into the orifice tube; the thin-walled welding section includes a second inclined surface that slopes forward and downward in the circumferential surface of the second end in the direction of inserting the orifice tube, and a thin-walled section with a thickness less than the thickness of the second joint is formed at the front end of the second inclined surface.

3. The joint welding structure of a metal filter bag according to claim 1, characterized in that: The circumferential surface of the second end forms a conical surface that gradually thickens inward from the end. The end of the second end facing the orifice tube forms a connecting section with a relatively thin thickness for welding with the inserted reduced-diameter section.

4. The joint welding structure of a metal filter bag according to claim 1, characterized in that: A threaded connection is formed between the first joint and the second joint. An external thread is provided on the outer wall of the first joint behind the first end, and an internal thread is provided on the inner wall of the second joint behind the second end.

5. The joint welding structure of a metal filter bag according to claim 1 or 2, characterized in that: In each filter bag section, welding is carried out after docking between the ends of two adjacent orifice tubes. One end of the orifice tube is internally reduced to form a reduced-diameter section that can be inserted and clamped into the end of the other orifice tube. The welded part is formed at the part where the reduced-diameter section abuts against the end of the other orifice tube, or the reduced-diameter section is inserted into the second end of the second joint.

6. The joint welding structure of a metal filter bag according to claim 5, characterized in that: The reduced-diameter section includes an inclined transition section formed by inwardly forming an inclined section at one end of the orifice tube, and then an internally reduced section is formed. The internally reduced section is clamped inside the end of the other orifice tube.

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