CN214309761U - Steam sampling tube mechanism for high-temperature and high-pressure steam pipeline of thermal power plant - Google Patents
Steam sampling tube mechanism for high-temperature and high-pressure steam pipeline of thermal power plant Download PDFInfo
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- CN214309761U CN214309761U CN202120409585.8U CN202120409585U CN214309761U CN 214309761 U CN214309761 U CN 214309761U CN 202120409585 U CN202120409585 U CN 202120409585U CN 214309761 U CN214309761 U CN 214309761U
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Abstract
The utility model discloses a steam sampling tube mechanism for a high-temperature and high-pressure steam pipeline of a thermal power plant, wherein a columnar hole and a circular boss which are communicated with each other are arranged on the side wall of an alloy steel pipeline from outside to inside, and a columnar internal thread is arranged on the inner wall of the columnar hole; the alloy steel steam sampling pipe comprises a steam sampling pipe connecting pipe, an upper large-diameter columnar body, a middle small-diameter columnar body, a conical body and a columnar body, wherein the upper large-diameter columnar body is positioned at the upper part of a columnar hole on the side wall of the alloy steel pipeline and is welded and connected by adopting a steel fillet weld of the same type, the bottom of the columnar hole is provided with a single V-shaped groove, the middle small-diameter columnar body is positioned in the columnar hole on the side wall of the alloy steel pipeline and is provided with an external thread, the lower part of the conical body is in contact with a circular boss of the alloy steel pipeline, and the columnar body is provided with a steam sampling hole and extends into the alloy steel pipeline; the steam sampling pipe connecting pipe is connected with the steam sampling pipe system. The utility model discloses the mechanism rigidity is big, difficult vibration, has eliminated the weak interface of xenogenesis steel welding seam and the influence of alloy steel steam sampling tube middle part screw thread axial pressure to alloy steel pipeline and alloy steel steam sampling tube fillet weld.
Description
Technical Field
The utility model relates to a high temperature high pressure steam pipeline steam sampling technical field of thermal power plant, concretely relates to high temperature high pressure steam pipeline of thermal power plant is with steam sampling tube mechanism.
Background
In the operation process of the thermal power plant unit, for accurately reflecting the quality condition of steam, the damage to equipment caused by insufficient steam purity is prevented, the working medium is ensured to meet the design requirement, a plurality of steam sampling devices are required to be designed and installed on the alloy steel pipeline of the thermal power plant, the state of the working medium is monitored in real time, and the safe operation of the unit is ensured.
Fig. 1 is a schematic view showing a conventional steam sampling tube. An austenitic stainless steel steam sampling pipe 4 penetrates into the interior of the pipeline through the openings of a ferrite alloy steel connecting pipe seat 2 and a ferrite steel pipeline 1, the pipe orifice at the upper part of the connecting pipe seat 2 and the upper part of the sampling pipe 4 are welded by adopting a Ni-based welding material to form a dissimilar steel welding seam 3, and the pipe orifice at the lower part of the connecting pipe seat 2 and the opening of the pipeline 1 are welded by adopting the same material welding material to form a same steel welding seam 5; the sampling tube 4 and the opening of the tube opening are in interference fit structure. The steam sampling tube has the following defects and disadvantages: the steam sampling tube 4 and the alloy steel connecting tube seat 2 are respectively an austenite matrix and a ferrite matrix, belong to dissimilar steel connection, have large difference in chemical composition and thermal expansion coefficient between the two, and the fusion interface between the welding seam 3 and the connecting tube seat 2 is easy to crack; in addition, in the operation process of the unit, under the action of steam and the action of the difference of the thermal expansion coefficients, the interference fit between the steam sampling tube 4 and the opening of the pipe orifice 1 is changed into clearance fit, so that the steam sampling tube vibrates under the action of the steam, stress concentration is formed at the root of the welding seam 3, and the fusion interface of the welding seam 3 and the pipe connecting seat 2 is cracked and falls off under the action of alternating stress.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned steam sampling tube structure's shortcoming and not enough, provide a steam sampling tube mechanism for high temperature high pressure steam pipeline of thermal power plant, have simple structure, save material, safe, reliable advantage.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a steam sampling pipe mechanism for a high-temperature and high-pressure steam pipeline of a thermal power plant is characterized in that a cylindrical hole and a circular boss 1-2 which are communicated with each other are formed in the side wall of an alloy steel pipeline 1 adopted by the high-temperature and high-pressure steam pipeline of the thermal power plant from outside to inside, and a cylindrical internal thread 1-1 is formed in the inner wall of the cylindrical hole; the alloy steel steam sampling tube 2 comprises a steam sampling tube connecting tube 2-1, an upper large-diameter cylindrical body 2-2 with a single V-shaped groove at the bottom, a middle small-diameter cylindrical body 2-3 with an external thread, a conical body 2-4 with the lower part contacting with the circular boss 1-2 of the alloy steel pipeline in a contact manner, and a cylindrical body 2-5 with a steam sampling hole 3, which are connected in sequence; the upper large-diameter columnar body 2-2 with the single V-shaped groove at the bottom of the alloy steel steam sampling pipe 2 is positioned at the upper part of the columnar hole on the side wall of the alloy steel pipeline 1 and is welded and connected at the single V-shaped groove by adopting the same type of steel fillet weld 4 matched with the materials of the alloy steel pipeline 1 and the alloy steel steam sampling pipe 2; the middle small-diameter columnar body 2-3 provided with the external thread of the alloy steel steam sampling pipe 2 is positioned in the columnar hole in the side wall of the alloy steel pipeline 1, and the external thread of the middle small-diameter columnar body is matched with the internal thread 1-1 of the columnar hole of the alloy steel pipeline 1; the conical body 2-4 of the alloy steel steam sampling pipe 2 is in contact with the circular boss 1-2 of the alloy steel pipeline in a butting manner to form a fixed fulcrum; the cylindrical body 2-5 at the lower part of the alloy steel steam sampling pipe 2 extends into the alloy steel pipeline 1; the top of the alloy steel steam sampling pipe 2 is provided with a steam sampling pipe connecting pipe 2-1 which is in smooth transition, and the steam sampling pipe connecting pipe 2-1 is connected with a steam sampling pipe system.
The alloy steel steam sampling pipe 2 is screwed in through the matching of external threads of the outer periphery of the middle small-diameter cylindrical body 2-3 and internal threads 1-1 of the cylindrical hole of the alloy steel pipeline 1, and the lower conical body 2-4 of the alloy steel steam sampling pipe 2 is in firm contact with the circular boss 1-2 of the alloy steel pipeline 1 in the circumferential direction by means of axial load between thread pairs.
Preferably, the large-diameter cylindrical body 2-2 at the upper part of the alloy steel steam sampling pipe 2 and the cylindrical hole of the alloy steel pipeline 1 adopt a straddle type installation mode.
Preferably, the same type of steel fillet weld 4 is of a full penetration structure.
Preferably, the internal thread 1-1 of the columnar hole of the alloy steel pipeline 1 is a fine internal thread, and the external thread of the outer peripheral ring of the middle small-diameter columnar body 2-3 of the corresponding alloy steel steam sampling pipe 2 is also a matched fine internal thread, so that the matching is tighter.
Preferably, the aperture of the circular boss 1-2 of the columnar hole of the alloy steel pipeline 1 is 4-8 mm smaller than that of the thread 1-1 in the columnar hole of the alloy steel pipeline 1.
Preferably, the alloy steel steam sampling pipe 2 enables the lower conical body 2-4 of the alloy steel steam sampling pipe 2 to be in circumferential firm contact with the circular boss 1-2 of the alloy steel pipeline 1 through axial load between the thread pairs.
Preferably, the number of the steam sampling holes 3 is 4-6, and the diameter of each sampling hole is 1.5-2 mm.
Compared with the prior art, the utility model has the advantages that:
1. the alloy steel pipeline and the alloy steel steam sampling pipe are welded and connected by the same material, the welding line between the steam sampling pipe and the alloy steel pipeline is of a full penetration welding structure, components have no composition difference, the thermal expansion coefficients are consistent, and a weak interface existing in a dissimilar steel welding joint is eliminated.
2. The alloy steel steam sampling pipe is firmly fixed by three points of the upper part of the alloy steel pipeline connected with the same steel fillet weld, the middle thread and the lower cone, has high rigidity, cannot vibrate under the action of high-pressure steam, radically eliminates the mechanical factors of steam sampling pipe cracking or weld cracking, and ensures the safety and reliability of the steam sampling pipe.
3. Processing internal threads on the inner wall of the opening of the alloy steel pipeline, and matching with external threads on the outer periphery of a small-diameter cylindrical body in the middle of the steam sampling pipe; the axial load between the thread pairs can not generate additional stress on the fillet weld between the steam sampling pipe and the alloy steel pipeline, and the reliability of the same type of steel fillet weld is improved.
4. Compared with a steam sampling tube device with the traditional design, the steam sampling tube mechanism does not need a tube socket, saves materials and reduces the number of welding seams of the steam sampling tube device.
5. The steam sampling tube mechanism is simple in installation process, high in reliability and convenient to maintain.
Drawings
Fig. 1 is a schematic diagram of a conventional vapor sampling tube structure.
Fig. 2 is the utility model provides a pair of steam sampling tube mechanism mounting structure sketch map.
Fig. 3 is the utility model provides an alloy steel pipeline trompil inner wall internal thread and the circular boss structure sketch map in bottom.
Detailed Description
In order to make the present invention more obvious and understandable, the following detailed description of the present invention is made with reference to the accompanying drawings and specific embodiments:
as shown in fig. 2 and 3, in the steam sampling tube mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant provided by the utility model, a cylindrical hole and a circular boss 1-2 which are communicated with each other are arranged on the side wall of an alloy steel pipeline 1 adopted by the high-temperature and high-pressure steam pipeline of the thermal power plant from outside to inside, and a cylindrical internal thread 1-1 is arranged on the inner wall of the cylindrical hole; the alloy steel steam sampling tube 2 comprises a steam sampling tube connecting tube 2-1, an upper large-diameter cylindrical body 2-2 with a single V-shaped groove at the bottom, a middle small-diameter cylindrical body 2-3 with an external thread, a conical body 2-4 with the lower part contacting with the circular boss 1-2 of the alloy steel pipeline in a contact manner, and a cylindrical body 2-5 with a steam sampling hole 3, which are connected in sequence.
The upper large-diameter columnar body 2-2 with the single V-shaped groove at the bottom of the alloy steel steam sampling pipe 2 is positioned at the upper part of the columnar hole on the side wall of the alloy steel pipeline 1 and is welded and connected at the single V-shaped groove by adopting the same type of steel fillet weld 4 matched with the materials of the alloy steel pipeline 1 and the alloy steel steam sampling pipe 2; the middle small-diameter columnar body 2-3 provided with the external thread of the alloy steel steam sampling pipe 2 is positioned in the columnar hole in the side wall of the alloy steel pipeline 1, and the external thread of the middle small-diameter columnar body is matched with the internal thread 1-1 of the columnar hole of the alloy steel pipeline 1; the conical body 2-4 of the alloy steel steam sampling pipe 2 is in contact with the circular boss 1-2 of the alloy steel pipeline in a butting manner to form a fixed fulcrum; the lower part of the alloy steel steam sampling pipe 2 is provided with a cylindrical body 2-5 with a steam sampling hole 3 and extends into the alloy steel pipeline 1; the top of the alloy steel steam sampling pipe 2 is provided with a steam sampling pipe connecting pipe 2-1 which is in smooth transition, and the steam sampling pipe connecting pipe 2-1 is connected with a steam sampling pipe system.
As shown in FIG. 3, the structure of the columnar internal thread 1-1 and the bottom of the columnar internal thread 1-2 with the circular boss of the alloy steel pipe inner wall is schematically shown. The cylindrical internal thread 1-1 of the inner wall of the alloy steel pipeline is matched with the external thread 2-3 of the middle small-diameter cylindrical body of the alloy steel steam sampling pipe and is used as a fixed point in the installation process of the alloy steel steam sampling pipe; the round boss 1-2 at the bottom of the alloy steel pipeline 1 is matched with the inclined plane of the lower conical body 2-4 of the steam sampling pipe of the alloy steel pipeline to serve as another fixing point. The aperture of the through hole with the circular boss 1-2 at the bottom of the alloy steel pipeline 1 is 4-6 mm smaller than the aperture of the columnar hole of the alloy steel pipeline 1.
The implementation case is as follows: the original opening on the alloy steel pipeline 1 is a through-diameter hole, the upper part of the original opening of the alloy steel pipeline 1 is firstly reamed before installation, a round boss with the thickness of more than 3mm is reserved at the bottom of a new opening, the reaming is coaxial with the inner wall of the upper pipe orifice of the alloy steel steam sampling pipe 2, and the deviation between the diameter of the upper opening of the new reaming and the diameter of the upper pipe orifice of the alloy steel steam sampling pipe 2 is less than 1 mm; and (3) processing a fine internal thread on the inner wall of the alloy steel pipeline 1 in the reaming process by using a tapping machine, wherein the small-diameter columnar fine external thread in the middle of the alloy steel steam sampling pipe 2 is matched with the processing specification of the internal thread on the inner wall of the alloy steel pipeline 1 in the reaming process. The alloy steel steam sampling pipe 2 is screwed into the open pore of the alloy steel pipeline 1 through the assembly of the external thread of the middle small-diameter columnar body and the internal thread of the inner wall of the expanded hole of the alloy steel pipeline 1 until the conical body 2-4 of the alloy steel steam sampling pipe 2 is in circumferential firm contact with the circular boss 1-2 of the alloy steel pipeline 1, and meanwhile, the steam sampling hole 3 is ensured to be over against the steam flow direction of the alloy steel pipeline 1. The fillet weld of the alloy steel steam sampling pipe 2 and the alloy steel pipeline 1 is firstly subjected to manual argon tungsten-arc welding bottoming by adopting welding materials of the same material, and then is subjected to filling and capping welding by using manual electric arc welding. The fillet weld welding of the alloy steel steam sampling pipe 2 and the alloy steel pipeline 1 adopts a full penetration structure, and the heat treatment is carried out after the welding according to relevant standards.
Claims (7)
1. The utility model provides a steam sampling tube mechanism for high temperature high pressure steam pipeline of thermal power plant which characterized in that: the side wall of an alloy steel pipeline (1) adopted by a high-temperature and high-pressure steam pipeline of a thermal power plant is provided with a columnar hole and a circular boss (1-2) which are communicated from outside to inside, and the inner wall of the columnar hole is provided with columnar internal threads (1-1); the alloy steel steam sampling pipe (2) comprises a steam sampling pipe connecting pipe (2-1), an upper large-diameter cylindrical body (2-2) with a single V-shaped groove at the bottom, a middle small-diameter cylindrical body (2-3) with an external thread, a conical body (2-4) with the lower part contacting with a circular boss (1-2) of the alloy steel pipeline in a contact manner, and a cylindrical body (2-5) with a steam sampling hole (3), which are connected in sequence; the upper large-diameter columnar body (2-2) with the single V-shaped groove at the bottom of the alloy steel steam sampling pipe (2) is positioned at the upper part of the columnar hole on the side wall of the alloy steel pipeline (1) and is welded and connected at the single V-shaped groove by adopting the same steel angle welding line (4) matched with the alloy steel pipeline (1) and the alloy steel steam sampling pipe (2); the middle small-diameter columnar body (2-3) provided with the external thread of the alloy steel steam sampling pipe (2) is positioned in the columnar hole in the side wall of the alloy steel pipeline (1), and the external thread of the middle small-diameter columnar body is matched with the internal thread (1-1) of the columnar hole of the alloy steel pipeline (1); the conical body (2-4) of the alloy steel steam sampling pipe (2) is in contact with the circular boss (1-2) of the alloy steel pipeline to form a fixed fulcrum; the cylindrical body (2-5) at the lower part of the alloy steel steam sampling pipe (2) extends into the alloy steel pipeline (1); the top of the alloy steel steam sampling pipe (2) is provided with a steam sampling pipe connecting pipe (2-1) which is in smooth transition, and the steam sampling pipe connecting pipe (2-1) is connected with a steam sampling pipe system.
2. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the alloy steel steam sampling pipe (2) is screwed in through the matching of external threads of the outer peripheral ring of the middle small-diameter cylindrical body (2-3) and the cylindrical internal threads (1-1) of the alloy steel pipeline (1), and the lower conical body (2-4) of the alloy steel steam sampling pipe (2) is in firm contact with the circular boss (1-2) of the alloy steel pipeline (1) in the circumferential direction by means of axial load between thread pairs.
3. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the same steel fillet weld (4) is of a full penetration structure.
4. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the large-diameter cylindrical body (2-2) at the upper part of the alloy steel steam sampling pipe (2) and the cylindrical hole of the alloy steel pipeline (1) adopt a straddle type installation mode.
5. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the internal thread (1-1) of the columnar hole of the alloy steel pipeline (1) is a fine internal thread, and the external thread of the outer peripheral ring of the middle small-diameter columnar body (2-3) of the corresponding alloy steel steam sampling pipe (2) is also a matched fine internal thread, so that the matching is tighter.
6. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the aperture of the circular boss (1-2) of the columnar hole of the alloy steel pipeline (1) is 4-8 mm smaller than that of the columnar hole internal thread (1-1) of the alloy steel pipeline (1).
7. The steam sampling pipe mechanism for the high-temperature and high-pressure steam pipeline of the thermal power plant as claimed in claim 1, wherein: the number of the steam sampling holes (3) is 4-6, and the diameter of each sampling hole is 1.5-2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120409585.8U CN214309761U (en) | 2021-02-25 | 2021-02-25 | Steam sampling tube mechanism for high-temperature and high-pressure steam pipeline of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120409585.8U CN214309761U (en) | 2021-02-25 | 2021-02-25 | Steam sampling tube mechanism for high-temperature and high-pressure steam pipeline of thermal power plant |
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| Publication Number | Publication Date |
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| CN214309761U true CN214309761U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120409585.8U Active CN214309761U (en) | 2021-02-25 | 2021-02-25 | Steam sampling tube mechanism for high-temperature and high-pressure steam pipeline of thermal power plant |
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| CN (1) | CN214309761U (en) |
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2021
- 2021-02-25 CN CN202120409585.8U patent/CN214309761U/en active Active
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