CN112524379A - Stainless steel elbow with screw mouth lining - Google Patents
Stainless steel elbow with screw mouth lining Download PDFInfo
- Publication number
- CN112524379A CN112524379A CN202110086486.5A CN202110086486A CN112524379A CN 112524379 A CN112524379 A CN 112524379A CN 202110086486 A CN202110086486 A CN 202110086486A CN 112524379 A CN112524379 A CN 112524379A
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- China
- Prior art keywords
- stainless steel
- elbow
- lining
- outer sleeve
- steel elbow
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
- F16L43/001—Bends; Siphons made of metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
- F16L15/008—Screw-threaded joints; Forms of screw-threads for such joints with straight threads with sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The invention provides a stainless steel elbow with a threaded opening lining, belonging to the technical field of manufacturing of drinking water pipeline connecting pieces; the invention comprises the following steps: a jacket and an inner liner; the outer sleeve is of a round pipe elbow structure; the inner lining layer sleeve is arranged in the outer sleeve, and a filling layer is arranged between the inner lining layer and the outer sleeve; the lining layer is a stainless steel elbow; the inner walls of the two ends of the outer sleeve are respectively provided with a threaded interface; the threaded interface is also provided with an elastic sealing ring; the cross-section of sealing washer is right trapezoid, this right trapezoid's two parallel limit respectively with the outer wall of inner liner with the inner wall of overcoat contacts, and this right trapezoid's hypotenuse orientation hickey. The invention adopts the sealing ring embedded with the edge of the lining layer and the end part of the pipeline to be butted, and the inclined butting surface of the sealing ring provides an elastic installation space, thereby making up the tolerance range generated during the installation and production of pipe threads and pipe fittings, not only maintaining excellent pressure-bearing corrosion resistance, but also reducing the passing resistance of fluid due to smooth inner wall.
Description
Technical Field
The invention relates to a manufacturing technology of drinking water pipeline connecting pieces, in particular to a stainless steel elbow with a threaded lining, and belongs to the technical field of metal product manufacturing.
Background
Along with the continuous improvement of living standard and quality of life of common people, in order to better improve the quality of drinking water, let common people use more safe healthy drinking water. At present market inside lining stainless steel pipeline has been used widely, but among the prior art, with inside lining stainless steel pipeline assorted pipe fitting, when being connected with the pipeline, because pipeline terminal surface and the inside can not closely cooperate sealedly of pipe fitting, thereby make pipeline tip corrode and cause drinking water pollution.
Specifically, in the installation process of the screw pipe fitting in the prior art, as constructors perform threading machines on the steel pipe threads, the threads at the end of the pipeline are sometimes threaded in different degrees; in addition, the pipe fitting has three different thread calibers of large, medium and small in the threading production process. Although the two machining processes all follow the allowable machining tolerance range of the state, the accumulated tolerance range causes tolerance at the threaded connection part between the pipe thread and the malleable cast iron pipe fitting in the installation process, so that the probability of a gap between the end surface of the pipeline and the pipe fitting seal is increased, the pipe end and the pipe fitting seal rubber ring cannot be tightly matched and sealed, and further, the pipe end is corroded to cause water pollution.
The sealing ring commonly used in the prior art is a stepped sealing ring, and the biggest disadvantage is that the step is planar. The step type sealing ring is used for processing the pipe thread and the thread of the pipe fitting, the sealing effect can be achieved only when the step plane sealing position is reached during installation, thus bringing high technical requirements to field installation and pipe fitting production and processing, otherwise, the pipe thread can not be screwed to the position of the sealing ring and is screwed, the sealing effect can not be achieved, the pipe end is contacted with water, and water pollution is caused,
therefore, the technical problem to be solved by those skilled in the art is to develop a stainless steel lining elbow capable of effectively solving the leakage of the end face of the stainless steel lining pipeline.
Disclosure of Invention
The invention provides a novel stainless steel elbow with a threaded opening lining, wherein a sealing ring with an inclined cross section is clamped into an interface between a lining layer and an outer sleeve part, so that the technical problem that the end part of a pipeline is easy to leak and corrode in the prior art is solved.
The invention provides a stainless steel elbow with a threaded opening lining, which comprises: a jacket and an inner liner; the outer sleeve is of a round pipe elbow structure; the inner lining layer sleeve is arranged in the outer sleeve, and a filling layer is arranged between the inner lining layer and the outer sleeve; the lining layer is a stainless steel elbow;
the inner walls of the two ends of the outer sleeve are respectively provided with a threaded interface; the threaded interface is also provided with an elastic sealing ring;
the cross-section of sealing washer is right trapezoid, this right trapezoid's two parallel limit respectively with the outer wall of inner liner with the inner wall of overcoat contacts, and this right trapezoid's hypotenuse orientation hickey.
The stainless steel elbow with the threaded opening as the lining, wherein the diameter of the elbow is D, the curvature radius of the elbow is R, and R is less than or equal to 1.0D.
The threaded lined stainless steel elbow as described above, wherein the elbow comprises: the bending device comprises a bending main body and two straight pipe sections arranged at two ends of the bending main body; each threaded interface is arranged on the inner wall of the straight pipe section;
the inner liner includes: the stainless steel elbow comprises a stainless steel elbow main body and stainless steel straight pipe sections arranged at two ends of the stainless steel elbow main body;
the axis of the stainless steel straight pipe section is superposed with the axis of the straight pipe section.
The stainless steel elbow with the threaded opening as the lining, wherein the thread pitch of the threaded interface is L; in the right-angle trapezoidal section of the sealing ring, the difference value of two parallel edges is S, and then S is less than or equal to 1.5L.
The stainless steel elbow with a threaded lining as described above, wherein the filling layer is a plastic filling layer, and the plastic filling layer comprises: PP, PPR, polytetrafluoroethylene, PC and silica gel;
the outer sleeve is a cast iron elbow, a cast steel elbow or a copper elbow; the sealing ring is a silica gel sealing ring;
the lining layer is a 304 stainless steel lining layer.
The stainless steel elbow with the screw mouth lining is characterized in that the length of the stainless steel straight pipe section is 2-5 mm.
The stainless steel elbow with the internal lining at the screw mouth is characterized in that the thickness of the internal lining layer is 0.5-0.7 mm.
The stainless steel elbow with the threaded opening as the lining, wherein the diameter of the elbow is D, and the curvature radius of the elbow is R, R is more than or equal to 0.9D and less than or equal to 1.0D.
The silk-lined stainless steel elbow as described above, wherein the nominal diameter of the jacket is DN20, DN25, DN32, DN40, DN50, DN65 or DN 80.
The stainless steel elbow with the internal threaded lining is characterized in that the surface of the outer sleeve is sprayed with epoxy powder paint or hot-dip zinc coating.
The invention adopts the sealing ring embedded with the edge of the lining layer and the end part of the pipeline to be butted, and the inclined butting surface of the sealing ring provides an elastic installation space, thereby making up the tolerance range generated during the installation and production of pipe threads and pipe fittings, not only maintaining excellent pressure-bearing corrosion resistance, but also reducing the passing resistance of fluid due to smooth inner wall.
Drawings
FIG. 1 is a schematic cross-sectional view of a stainless steel elbow with a threaded bore liner according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
fig. 3 is a partially enlarged view of fig. 2.
Detailed Description
The stainless steel elbow lined with the screw opening in the embodiment of the invention particularly refers to a 90-degree elbow.
FIG. 1 is a schematic cross-sectional view of a stainless steel elbow with a threaded bore liner according to an embodiment of the present invention; the stainless steel elbow with the threaded opening lining provided by the embodiment of the invention comprises: an outer sleeve 1 and an inner liner 3; the outer sleeve 1 is of a round pipe elbow structure; the inner liner layer 3 is sleeved in the outer sleeve, and a filling layer 2 is arranged between the inner liner layer 3 and the outer sleeve 1; the lining layer 3 is a stainless steel elbow; the inner liner is an integrated stainless steel thin-wall elbow which is processed independently, is sleeved in the outer sleeve 1 and is fixed by the adhesion of the filling layer.
The inner walls of the two ends of the outer sleeve 1 are respectively provided with a threaded connector 10; the threaded interface 10 is also provided with an elastic sealing ring 4; the sealing ring 4 is used to seal the end of the pipe after the elbow is connected to the pipe.
As shown in fig. 2, the cross section of the sealing ring 4 is a right trapezoid, two parallel sides (M and N in fig. 3) of the right trapezoid are respectively in contact with the outer wall of the lining layer 3 and the inner wall of the outer sleeve 1, and the oblique side of the right trapezoid faces the threaded joint 10.
The sealing ring is an inclined sealing ring without a plane step, the elastic installation space of 1.5 screw teeth is enlarged by the inclined sealing ring, and the sealing ring is fixed at the position of a pipeline screw thread tightening state, so that the tolerance range generated in the installation and production of a pipe thread and a pipe fitting is compensated, namely, no matter the tolerance range within the tightness range of 1.5 screw teeth (thread pitch) is generated in the field installation of pipeline screw thread processing and pipe fitting processing, the tolerance range can be compensated by the inclined sealing ring, so that the sealing effect is better played, and the health and safety of drinking water are ensured.
The invention adopts the sealing ring embedded with the edge of the lining layer and the end part of the pipeline to be butted, and the inclined butting surface of the sealing ring provides an elastic installation space, thereby making up the tolerance range generated during the installation and production of pipe threads and pipe fittings, not only maintaining excellent pressure-bearing corrosion resistance, but also reducing the passing resistance of fluid due to smooth inner wall.
In general, as shown in fig. 2, the diameter of the elbow is D, and the curvature radius of the elbow is R, then R is less than or equal to 1.0D. Furthermore, the diameter of the elbow is D, and the curvature radius of the elbow is R, then R is more than or equal to 0.9D and less than or equal to 1.0D.
The smaller the radius of curvature of the bend, the more compact the overall bend structure and the less material that is consumed, and therefore the more cost effective. The elbow structure of the embodiment is mainly applied to the stainless steel elbow with the threaded opening lining, wherein R is less than or equal to 1.0D.
The stainless steel elbow with a threaded lining of the embodiment comprises: the bending device comprises a bending main body and two straight pipe sections arranged at two ends of the bending main body; each of the screw interfaces 10 is arranged on the inner wall of the straight pipe section; the straight pipe section is used for ensuring sufficient and effective connection with the pipeline thread.
The inner liner includes: the stainless steel elbow comprises a stainless steel elbow main body and stainless steel straight pipe sections arranged at two ends of the stainless steel elbow main body; the axis of the stainless steel straight pipe section is superposed with the axis of the straight pipe section.
Generally, the length H of the stainless steel straight pipe section is 2-5 mm.
Because the axis of the stainless steel straight pipe section and the axis of the straight pipe section of the outer sleeve are overlapped, the sealing ring 4 is more conveniently and accurately accommodated in the stainless steel straight pipe section and the straight pipe section of the outer sleeve, and the sealing ring 4 is prevented from generating uneven deformation in the compression process, so that gaps are caused.
In the stainless steel elbow lined in the screw port of the present embodiment, as shown in fig. 3, the screw pitch of the screw interface is L; in the right trapezoid cross section of the sealing ring, the difference value of two parallel sides is S (namely M-N = S), and then 1.5L is less than or equal to S.
The elbow and the pipeline are fully ensured to have sufficient connection elasticity, so that excellent sealing performance can be obtained within the elastic distance of compression of the sealing ring.
The stainless steel elbow with a threaded lining of the embodiment, wherein the filling layer 2 is a plastic filling layer, and the plastic filling layer comprises: PP, PPR, polytetrafluoroethylene, PC and silica gel;
the outer sleeve 1 is a cast iron elbow, a cast steel elbow or a copper elbow; the sealing ring 4 is a silica gel sealing ring or a tetrafluoroethylene sealing ring; the outer sleeve 1 is a cast iron elbow, a cast steel elbow or a copper elbow, and generally adopts a standard elbow on the market. The cast iron elbow is generally malleable cast iron which is high-strength and high-toughness cast iron obtained by graphitizing and annealing white cast iron. Has higher strength, plasticity and impact toughness, and can partially replace carbon steel. Compared with grey cast iron, the malleable cast iron has better strength and plasticity, especially better low-temperature impact property, and better wear resistance and vibration damping property than common carbon steel. The cast iron is commonly called malleable iron and ductile cast iron because of certain plasticity and toughness. Black heart malleable cast iron is used for parts subjected to impact or shock and torsion loads, and is commonly used for manufacturing automobile rear axles, spring brackets, low-pressure valves, pipe joints, tool wrenches and the like.
The lining layer 3 is a 304 stainless steel lining layer.
Typically, the thickness of the inner liner is 0.5-0.7 mm. If a thicker stainless steel inner liner is adopted, the cost is greatly increased; in addition, in the process of manufacturing a thinner stainless steel inner liner (R is less than or equal to 1.0D when the stainless steel elbow with the stainless steel straight pipe section is manufactured), the inner arc surface is easy to wrinkle in the bending process, and the outer arc surface is easy to be excessively stretched, cracked or abraded in the bending process.
In addition, the surface of the outer sleeve 1 is sprayed with epoxy powder paint or hot-dip zinc coating to increase the anti-corrosion effect.
The stainless steel elbow lined with the screw thread of the embodiment is characterized in that the nominal diameter of the outer sleeve is DN20, DN25, DN32, DN40, DN50, DN65 or DN 80.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. Through the above description of the embodiments, those skilled in the art will clearly understand that the above embodiment method can be implemented by some modifications plus the necessary general technical overlap; of course, the method can also be realized by simplifying some important technical features in the upper level. Based on such understanding, the technical solution of the present invention essentially or contributing to the prior art is: the stainless steel lining layer with an integrated structure is selected and matched with the structure of each embodiment of the invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A stainless steel elbow with a threaded lining, which is characterized by comprising: a jacket and an inner liner; the outer sleeve is of a round pipe elbow structure; the inner lining layer sleeve is arranged in the outer sleeve, and a filling layer is arranged between the inner lining layer and the outer sleeve; the lining layer is a stainless steel elbow;
the inner walls of the two ends of the outer sleeve are respectively provided with a threaded interface; the threaded interface is also provided with an elastic sealing ring;
the cross-section of sealing washer is right trapezoid, this right trapezoid's two parallel limit respectively with the outer wall of inner liner with the inner wall of overcoat contacts, and this right trapezoid's hypotenuse orientation hickey.
2. The stainless steel elbow with threaded lining of claim 1, wherein the elbow has a diameter D and a radius of curvature R, wherein R is less than or equal to 1.0D.
3. The silk lined stainless steel elbow of claim 2, wherein the elbow comprises: the bending device comprises a bending main body and two straight pipe sections arranged at two ends of the bending main body; each threaded interface is arranged on the inner wall of the straight pipe section;
the inner liner includes: the stainless steel elbow comprises a stainless steel elbow main body and stainless steel straight pipe sections arranged at two ends of the stainless steel elbow main body;
the axis of the stainless steel straight pipe section is superposed with the axis of the straight pipe section.
4. The screwed-lined stainless steel elbow according to any one of claims 1 to 3, wherein the screw pitch of the nipple is L; in the right-angle trapezoidal section of the sealing ring, the difference value of two parallel edges is S, and then S is less than or equal to 1.5L.
5. A wirelined stainless steel elbow according to any one of claims 1 to 3, wherein the filler layer is a plastics filler layer comprising: PP, PPR, polytetrafluoroethylene, PC and silica gel;
the outer sleeve is a cast iron elbow, a cast steel elbow or a copper elbow; the sealing ring is a silica gel sealing ring;
the lining layer is a 304 stainless steel lining layer.
6. The screw port lined stainless steel elbow according to claim 3, wherein the length of the stainless steel straight pipe section is 2-5 mm.
7. The screwed port lined stainless steel elbow according to claim 1, wherein the thickness of the lining layer is 0.5-0.7 mm.
8. The stainless steel elbow with threaded lining of claim 1, wherein the elbow has a diameter D and a radius of curvature R, and wherein R is 0.9D. ltoreq. R.ltoreq.1.0D.
9. The silk lined stainless steel elbow of claim 1, wherein the nominal diameter of the outer jacket is DN20, DN25, DN32, DN40, DN50, DN65, or DN 80.
10. The stainless steel elbow with threaded lining of claim 1, wherein the surface of the outer sleeve is sprayed with epoxy powder paint or hot-dip zinc coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110086486.5A CN112524379A (en) | 2021-01-22 | 2021-01-22 | Stainless steel elbow with screw mouth lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110086486.5A CN112524379A (en) | 2021-01-22 | 2021-01-22 | Stainless steel elbow with screw mouth lining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112524379A true CN112524379A (en) | 2021-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110086486.5A Pending CN112524379A (en) | 2021-01-22 | 2021-01-22 | Stainless steel elbow with screw mouth lining |
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| Country | Link |
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| CN (1) | CN112524379A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983246A (en) * | 2021-11-19 | 2022-01-28 | 绍兴市水联管业有限公司 | Embedding sealed lining stainless steel pipe composite external connection |
-
2021
- 2021-01-22 CN CN202110086486.5A patent/CN112524379A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983246A (en) * | 2021-11-19 | 2022-01-28 | 绍兴市水联管业有限公司 | Embedding sealed lining stainless steel pipe composite external connection |
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