CN111520552A

CN111520552A - Chemical pipeline joint

Info

Publication number: CN111520552A
Application number: CN202010470370.7A
Authority: CN
Inventors: 张同生
Original assignee: Jingjiang Xinwang Dyeing And Finishing Equipment Factory
Current assignee: Jingjiang Xinwang Dyeing And Finishing Equipment Factory
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-08-11

Abstract

The invention discloses a chemical pipeline joint which comprises a first connecting pipe, a second connecting pipe and a connecting pipe sleeve, wherein the connecting pipe sleeve is of an integral structure and consists of a left end part, a right end part and a middle section, the connecting pipe sleeve is sleeved on the first connecting pipe and the second connecting pipe, the connecting pipe sleeve is connected with the first connecting pipe and the second connecting pipe through fastening devices, the fastening devices are arranged on the left end part and the right end part of the connecting pipe sleeve, grooves are symmetrically arranged between the left end part and the right end part and the middle section, an inner hole of the connecting pipe sleeve is of a straight hole type, a plurality of sealing grooves are axially arranged on the circumferential surface of the inner hole, and sealing elements are arranged in the sealing grooves. The invention has simple structure, good sealing performance and convenient installation and disassembly.

Description

Chemical pipeline joint

Technical Field

The invention relates to the field of conveying pipeline equipment, in particular to a chemical pipeline joint.

Background

As is known, in the food industry, the fine chemical industry and the printing and dyeing industry, a fine seamless steel pipe is generally used for conveying chemical solution, and the roughness processing precision of the inner wall surface of the fine seamless steel pipe is required to reach or exceed 0.2u, so that firstly, the efficiency of conveying the chemical solution is improved, and the chemical solution is prevented from being excessively adhered to the inner wall of a pipeline; secondly, in order to facilitate the washing, when the cleaning liquid (generally clean hot water) of the pipeline reaches a certain flow rate, the conveyed chemical solution can be washed clean, and no residual liquid is left in the pipeline. But general chemical industry pipeline transport distance is longer, and vertically and horizontally staggered, needs to be connected with connecting device between pipeline and the pipeline, and the pipeline uses a plurality of connecting device to connect the back, has chemical solution to remain easily, and remains the unable sanitization of chemical solution in the joint.

At present, the pipeline connection is commonly used by welding flange connection joints or threaded connection joints. The flange joint shown in fig. 1 is that after the pipe head and the flange are connected, the welding inner hole near the end surface is polished by mechanical grinding, then a sealing ring is arranged between the flanges on the end surfaces of two pipes, the two flanges are fastened and connected by screw fastening or hoop fastening, and three joints of the welding flange joint can be stained with chemical solution and cannot be washed cleanly: the sealing ring has the advantages that firstly, a gap dead angle between the sealing ring and the end face is formed, and chemical solution is easy to remain due to a large gap between the two connecting pipes, so that the sealing ring is corroded when a pipeline is polluted, and the durability is poor; secondly, the welding positions of the two flanges and the pipeline cannot be processed to be ultra-precision of 0.2u, and chemical solution is also adhered to the welding positions to pollute the pipeline; and thirdly, the metallographic phase of the welded material is changed, and the welded material is corroded by contacting with corrosive liquid, so that the surface of the inner hole of the welding is roughened, and the pollution degree of the two welded inner surfaces is increased. The threaded connection joint shown in fig. 2 is characterized in that external threads are machined on the outer circle of a connecting pipe, two external thread pipe pipelines are wound with sealing tapes and screwed into a sleeve with internal threads, although the connection mode is not welded, the gap between the end faces of the pipelines is still large, chemical solution can easily permeate into the gap where the threads are screwed, chemical residual liquid in the gap can corrode the threads, the service life is short, and the installation is inconvenient. Therefore, a new technology is needed to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a chemical pipeline joint, which solves the technical problems that a gap between connecting pipes is large, chemical solution is easy to leak, a pipeline is difficult to clean, so that a material mixing phenomenon is caused, the joint is easy to corrode, the service life is short, and the installation and the disassembly are inconvenient.

In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that: the utility model provides a chemical pipeline connects, includes that first takeover, second are taken over and the connecting tube cover, connecting tube cover structure as an organic whole, the connecting tube cover constitute by left end portion, right-hand member portion and interlude, the connecting tube cover suit be in first takeover and second takeover on, the connecting tube cover take over with first takeover and second and pass through fastener and be connected, fastener set up the left end portion and the right-hand member portion of connecting tube cover on, left end portion and right-hand member portion with the interlude between the symmetry be provided with the recess, the hole of connecting tube cover be the straight pass, hole periphery axial be provided with a plurality of seal groove, the seal groove in be provided with the sealing member.

As a preferred technical scheme: the left end and the right end of the connecting sleeve are radially provided with a plurality of through grooves, the through grooves extend into the grooves, and one axial end of each through groove is open.

As a preferred technical scheme: fastener be the clamp subassembly, the clamp subassembly constitute by clamp body, bolt and nut, the clamp body be open loop configuration, the uncovered department of loop configuration pass through bolt and nut fastening connection.

As a preferred technical scheme: the sealing element is an O-shaped sealing ring.

As a preferred technical scheme: the clearance between the first connecting pipe and the second connecting pipe is not more than 0.01 mm.

The invention has the beneficial effects that: a chemical pipeline connects compares with traditional structure: 1) by the aid of the structure, a seam gap between the two connecting pipes is not larger than 0.01mm, an air-tight gap is formed, the pipeline and the connecting device are not polluted due to leakage, residual chemical solution cannot be accumulated in the connecting pipes or the connecting pipe sleeves when the pipeline is flushed due to small gaps, the pipeline can be flushed completely, and different chemical solutions cannot be mixed to generate a material mixing phenomenon when other types of chemical solutions are conveyed subsequently; 2) the structure does not need welding or threads, the metallographic phase of the material of the connecting pipe does not change, the joint does not corrode when the connecting pipe conveys chemical solution, and the service life is prolonged; 3) the structure has good sealing performance, chemical solution conveyed in the pipeline cannot leak, and the air tightness is good; 4) the structure is simple and easy to operate, the installation and the disassembly are convenient, and the performance is reliable.

Drawings

FIG. 1 is a view of a flange joint construction;

FIG. 2 is a view showing a structure of a threaded joint

FIG. 3 is a block diagram of the present invention;

FIG. 4 is a right side view of the present invention;

in the figures 1-4, 1 is a first connecting pipe, 2 is a second connecting pipe, 3 is a connecting pipe sleeve, 3-1 is a left end part, 3-2 is a right end part, 3-3 is a middle section, 4 is a fastening device, 4-1 is a hoop body, 4-2 is a bolt, 4-3 is a nut, and 5 is a sealing element.

Detailed Description

The invention is further described below with reference to the accompanying drawings;

referring to fig. 1-4, a chemical pipeline joint comprises a first connecting pipe 1, a second connecting pipe 2 and a connecting pipe sleeve 3, wherein the connecting pipe sleeve 3 is of an integral structure, the connecting pipe sleeve 3 is composed of a left end portion 3-1, a right end portion 3-2 and a middle portion 3-3, the connecting pipe sleeve 3 is sleeved on the first connecting pipe 1 and the second connecting pipe 2, the connecting pipe sleeve 3 is connected with the first connecting pipe 1 and the second connecting pipe 2 through a fastening device 4, the fastening device 4 is arranged on the left end portion 3-1 and the right end portion 3-2 of the connecting pipe sleeve 3, grooves are symmetrically arranged between the left end portion 3-1 and the right end portion 3-2 and the middle portion 3-3, an inner hole of the connecting pipe sleeve 3 is of a straight hole type, and a plurality of sealing grooves are axially arranged on the circumferential surface of the inner hole, and a sealing element 5 is arranged in the sealing groove. The connecting pipe sleeve in the novel use comprises a left end part 3-1, a right end part 3-2 and a middle section 3-3, wherein the left end part 3-1 and the right end part 3-2 are provided with fastening devices 4 which are matched with each other to enable the connecting pipe sleeve 3 to be tightly connected with a first connecting pipe 1 and a second connecting pipe 2, grooves are symmetrically arranged between the left end part 3-1 and the right end part 3-2 and the middle section 3-3, when the connecting pipe sleeve 3 is tightly connected with the first connecting pipe 1 and the second connecting pipe 2 through the fastening devices 4, the left end part 3-1 and the right end part 3-2 can be easily subjected to elastic deformation by groove transition, and the connecting pipe sleeve 3 is more tightly connected with the first connecting pipe 1 and the second connecting pipe 2; the inner hole of the connecting pipe sleeve 3 is of a straight hole type, and can be attached to the outer surface of the connecting pipe according to different sizes of the connecting pipe, so that the gap between the connecting pipe and the connecting pipe sleeve 3 is reduced, and chemical solution is prevented from permeating between the connecting pipe and the connecting pipe sleeve 3; the connecting pipe sleeve 3 hole periphery be provided with a plurality of seal groove, preferred, the seal groove be four, two are a set of, the symmetry sets up at the hole periphery, the seal groove in be provided with sealing member 5, preferred, sealing member 5 is O type sealing washer, O type sealing washer is sealed through extrusion deformation, sealing performance is good, pipeline transportation requires device to have better gas tightness, uses four O type sealing washers to make whole gas tightness effect better, prevents the chemical industry solution seepage, reduces the pollution of takeover and connecting pipe sleeve 3. Compared with the flange connection joint shown in the figure 1, the flange connection joint disclosed by the invention is connected by using the fastening device 4, a flange and a welding pipe do not need to be manufactured, welding operation is not needed, the metallographic phase of a connecting pipe material is not changed, the reliability is higher, and the corrosion resistance of the connecting pipe is better.

As shown in fig. 1-4, the left end portion 3-1 and the right end portion 3-2 of the connecting pipe sleeve 3 are radially provided with a plurality of through grooves, the through grooves extend into the grooves, one axial end of each through groove is open, preferably, the through grooves are circumferentially and uniformly distributed and arranged, the number of the through grooves is four or six, the elasticity of the left end portion 3-1 and the right end portion 3-2 is better, and when the fastening device 4 is used, the left end portion 3-1 and the right end portion 3-2 can enable the connecting pipe sleeve 3 to be more tightly connected with the connecting pipe due to better elasticity.

As shown in fig. 1-4, the fastening device 4 is a clamp assembly, the clamp assembly is composed of a clamp body 4-1, a bolt 4-2 and a nut 4-3, the clamp body 4-1 is an open annular structure, the opening of the annular structure is tightly connected through the bolt 4-2 and the nut 4-3, the structure is convenient to install and disassemble and easy to operate, and a proper clamp can be selected according to different pipe sizes without specially manufacturing flanges or threads with different sizes compared with the flange connection shown in fig. 1 and the thread connection shown in fig. 2.

As shown in fig. 1-4, the gap between the first connecting pipe 1 and the second connecting pipe 2 is not greater than 0.01mm, the connecting pipe sleeve is of an integral structure, and threaded connection or welding connection is not required, compared with the flange connection shown in fig. 1 and the threaded connection shown in fig. 2, the connecting pipe sleeve 3 of the invention enables the gap between the two connecting pipe openings to be not greater than 0.01mm, chemical solution cannot leak in the airtight gap, residual chemical solution in the connecting pipes and the connecting pipe sleeve 3 cannot be caused, the pipeline can be cleaned, and the chemical solution cannot be mixed.

The foregoing examples are given solely for the purpose of illustrating the invention and are not to be construed as limiting the embodiments, and other variations and modifications in form thereof will be suggested to those skilled in the art upon reading the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments and all such obvious variations and modifications are deemed to be within the scope of the invention.

Claims

1. The utility model provides a chemical pipeline connects, includes first takeover (1), second takeover (2) and connection pipe box (3), its characterized in that: the connecting pipe sleeve (3) is of an integral structure, the connecting pipe sleeve (3) consists of a left end part (3-1), a right end part (3-2) and a middle section (3-3), the connecting pipe sleeve (3) is sleeved on the first connecting pipe (1) and the second connecting pipe (2), the connecting pipe sleeve (3) is connected with the first connecting pipe (1) and the second connecting pipe (2) through a fastening device (4), the fastening device (4) is arranged on the left end part (3-1) and the right end part (3-2) of the connecting pipe sleeve (3), grooves are symmetrically arranged between the left end part (3-1) and the right end part (3-2) and the middle section (3-3), an inner hole of the connecting pipe sleeve (3) is of a straight hole type, and a plurality of sealing grooves are axially arranged on the inner hole, and a sealing element (5) is arranged in the sealing groove.

2. A chemical pipeline joint as claimed in claim 1, wherein: the left end portion (3-1) and the right end portion (3-2) of the connecting pipe sleeve (3) are radially provided with a plurality of through grooves, the through grooves extend into the grooves, and one axial end of each through groove is open.

3. A chemical pipeline joint as claimed in claim 1, wherein: fastener (4) be the clamp subassembly, the clamp subassembly constitute by clamp body (4-1), bolt (4-2) and nut (4-3), clamp body (4-1) be open loop configuration, the uncovered department of loop configuration pass through bolt (4-2) and nut (4-3) fastening connection.

4. A chemical pipeline joint as claimed in claim 1, wherein: the sealing element (5) is an O-shaped sealing ring.

5. A chemical pipeline joint as claimed in claim 1, wherein: the clearance between the first connecting pipe (1) and the second connecting pipe (2) is not more than 0.01 mm.