CN110595876A - Metal corrugated pipe expansion joint pressure resistance test device and test method for falling film pipe - Google Patents
Metal corrugated pipe expansion joint pressure resistance test device and test method for falling film pipe Download PDFInfo
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- CN110595876A CN110595876A CN201910996725.3A CN201910996725A CN110595876A CN 110595876 A CN110595876 A CN 110595876A CN 201910996725 A CN201910996725 A CN 201910996725A CN 110595876 A CN110595876 A CN 110595876A
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 239000011552 falling film Substances 0.000 title claims abstract description 19
- 239000002184 metal Substances 0.000 title claims abstract description 16
- 238000010998 test method Methods 0.000 title claims description 4
- 238000007789 sealing Methods 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000010408 film Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000007493 shaping process Methods 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a pressure resistance test device for a metal corrugated pipe expansion joint for a falling film pipe, which comprises an outer groove flange, an outer boss flange, an inner groove flange and an inner boss flange; an outer sealing ring is arranged at the matching position of the outer groove flange and the outer boss flange, and an inner sealing ring is arranged at the matching position of the inner groove flange and the inner boss flange; the stepped screw is characterized by also comprising a stepped screw, wherein one end of the stepped screw is matched with the outer groove flange and the outer boss flange, and the other end of the stepped screw is matched with the inner boss flange and is locked on the step of the stepped screw through nuts respectively; the inner groove flange is matched with the inner boss flange through a fixing bolt. The structure of the invention can lead the expansion joint of the corrugated pipe to be limited axially after being assembled, and the expansion joint of the corrugated pipe cannot be deformed by axial stretching, thereby reducing the subsequent shaping work. Meanwhile, the sealing ring is forced to generate large deformation to form sealing, and the sealing reliability is high. The device can be repeatedly used, is convenient and fast, greatly improves the production efficiency and saves the production cost.
Description
Technical Field
The invention relates to the field of inspection equipment of metal corrugated pipe expansion joints, in particular to a pressure resistance test device of a metal corrugated pipe expansion joint for a falling film pipe.
Background
The falling film tube is one of core devices for producing caustic soda flakes. The falling film pipe consists of two layers of sleeves, the materials of the interlayer are molten salt, and the maximum working temperature is 430 ℃; the material of the inner pipe layer is alkali liquor, and the two liquids carry out heat transfer in a countercurrent mode. After the alkali liquor enters the inner layer of the falling film tube from top to bottom from the distributor, the alkali liquor is heated by jacket molten salt, boiled, concentrated and evaporated, and heated to 411.9 ℃ from 164.9 ℃ liquid alkali liquor to melt the alkali. Then the gas-liquid separator is separated by a bottom collecting pipe. The different media and different working temperatures of the two layers of tubes inside and outside the falling film tube are in contact with each other, and the difference of the deformation amount caused by expansion with heat and contraction with cold is larger due to the different materials and the difference of linear expansion coefficients of the two layers of tubes. The metal corrugated pipe expansion joint is arranged on an outer sleeve of the falling film pipe, and the deformation difference of the two sleeves is compensated by utilizing the elastic deformation of the metal corrugated pipe expansion joint. As patent numbers: 201620402992.5, the patent names: the utility model discloses a metal corrugated pipe expansion joint for a falling film pipe, which comprises a first connecting pipe, a lining ring, a corrugated pipe and a second connecting pipe, wherein the port of the first connecting pipe is of a necking structure matched with the outer diameter of the falling film pipe; the wave number of the corrugated pipe is 8-10 waves. The method obviously improves the service cycle of the falling film tube and meets the requirement of the alkali-making industry on the service life of the falling film tube.
According to the requirements, the pressure resistance test is carried out when the metal corrugated pipe expansion joint for the falling film pipe leaves the factory, the test pressure is 0.9MPa, the test medium is water, and the pressure is maintained for 15 min. One end of the expansion joint is a first connecting pipe, the other end of the expansion joint is a second connecting pipe, and the specifications of the raw materials of the connecting pipes are 15CrMo with phi 133x 6. The first connecting pipe is reduced to phi 113 through hot processing. The height of the connector is about 45mm, the inner surface and the outer surface are non-machined surfaces, and certain corrosion and out-of-roundness exist. The bellows has elastic property, can produce axial compression or tensile displacement under the exogenic action, and under sealed state, when the bellows receives internal pressure, the bellows has the extension trend, should carry out the spacing of axial direction with the expansion joint when carrying out the pressure resistance test, prevents that the bellows from tensile.
However, no better experimental device is available at present, and the requirements can be met.
Disclosure of Invention
The invention aims to provide a device and a method for testing the pressure resistance of a metal corrugated pipe expansion joint for a falling film pipe, which can realize good sealing and position limitation on the expansion joint.
The invention is realized by the following technical scheme: falling liquid film is with metal bellows expansion joint pressure resistance test device, the bellows expansion joint is taken over including the first takeover, the grommet, bellows, the second that the throat was handled, its characterized in that: the test device comprises an outer groove flange and an outer boss flange which are matched with the outer diameter of the first connecting pipe, and an inner groove flange and an inner boss flange which are matched with the inner diameter of the second connecting pipe; an outer sealing ring is arranged at the matching position of the outer groove flange and the outer boss flange on the outer side of the first connecting pipe, and an inner sealing ring is arranged at the matching position of the inner groove flange and the inner boss flange on the inner side of the second connecting pipe; the stepped screw is characterized by further comprising a stepped screw, wherein one end of the stepped screw is matched with the outer groove flange and the outer boss flange, and the other end of the stepped screw is matched with the inner boss flange and is locked on the step of the stepped screw 1 through nuts respectively; the inner groove flange is matched with the inner boss flange through a fixing bolt.
Further: and a test hole communicated with the tester is formed in the outer groove flange 3.
Further: the inner diameters of the outer groove flange 3 and the outer boss flange 5 are slightly larger than the outer diameter of the first connecting pipe; the inner diameter of the outer sealing ring 4 should be slightly smaller than the outer diameter of the first adapter tube.
Further: the outer diameters of the bosses of the inner concave groove flange 7 and the inner boss flange 9 are slightly smaller than the inner diameter of the second connecting pipe; the outer diameter of the inner sealing ring 8 is slightly larger than the inner diameter of the second connecting pipe.
Another aspect of the present invention is a method for testing the pressure resistance of a metal bellows expansion joint for a falling film tube, using the test apparatus according to any one of claims 1 to 4, wherein: the method comprises the following steps:
s1, installation: the inner sealing ring is arranged in a groove of the inner groove flange, the inner boss flange, the inner groove flange and the inner sealing ring are connected together by using a fixing bolt, and the inner sealing ring is kept in a loose state so as to ensure that the inner sealing ring can easily enter the second connecting pipe; the stepped screw rod penetrates through a through hole of the inner boss flange and is fastened by a nut, so that the stepped screw rod is prevented from loosening; assembling the second connecting pipe end of the expansion joint of the corrugated pipe to the inner groove flange, ensuring that the end face of the second connecting pipe is in close contact with the inner boss flange, and continuously fastening the fixing bolt until the inner sealing ring is compressed and deformed to form sealing with the inner surface of the second connecting pipe; and finally, the outer groove flange and the stepped screw are fastened to the outer sealing ring by using a nut and form sealing with the outer surface of the first connecting pipe after the outer sealing ring is subjected to compression deformation. I.e. the installation is complete.
S2, test: and connecting the pressure source with a threaded hole reserved in the outer groove flange through a quick connector, filling a pressure medium, and maintaining the pressure for a specified time to complete the test.
The invention has the advantages that: the structure of the invention can keep the expansion joint of the corrugated pipe in the original length state after being assembled, is not compressed or stretched, is axially limited, does not generate axial stretching deformation in the process of a pressure resistance test, and reduces the subsequent shaping work. Meanwhile, the structure is different from the common self-sealing generated by deformation of the sealing ring under the action of pressure, the structure ensures that the sealing ring is sealed with a rough rusted surface by forcing the sealing ring to generate large deformation, the sealing force can be adjusted, and the sealing reliability is high. The sealing structure can adapt to the pressure resistance test and the air tightness test of various expansion joint products welded by the corrugated pipe and the straight pipe connecting pipe, and a sealing mode of welding a blind plate at the straight port end is not needed. The pressure test device can be repeatedly used, is convenient and quick to test, greatly improves the production efficiency and saves the production cost.
Drawings
FIG. 1 is a schematic diagram of the sectional structure of the present invention.
The sequence numbers in the figures illustrate: the structure comprises a stepped screw rod 1, a nut 2, an outer groove flange 3, an outer sealing ring 4, an outer boss flange 5, a corrugated pipe expansion joint 6, a first connecting pipe 61, a corrugated pipe 62, a second connecting pipe 63, an inner groove flange 7, an inner sealing ring 8, an inner boss flange 9 and a fixing bolt 10.
Detailed Description
Fig. 1 shows a pressure resistance test device for a metal bellows expansion joint for a falling film tube, according to the invention, the bellows expansion joint 6 comprises a first connecting tube 61, a lining ring, a bellows 62 and a second connecting tube 63 which are subjected to necking treatment, and the test device comprises an outer groove flange 3 and an outer boss flange 5 which are matched with the outer diameter of the first connecting tube 61, and an inner groove flange 7 and an inner boss flange 9 which are matched with the inner diameter of the second connecting tube 63; an outer sealing ring 4 is arranged at the matching position of an outer groove flange 3 and an outer boss flange 5 on the outer side of the first connecting pipe, and an inner sealing ring 8 is arranged at the matching position of an inner groove flange 7 and an inner boss flange 9 on the inner side of the second connecting pipe; the stepped screw is characterized by further comprising a stepped screw 1, wherein one end of the stepped screw is matched with an outer groove flange 3 and an outer boss flange 5, and the other end of the stepped screw is matched with an inner boss flange 9 and is locked on the step of the stepped screw 1 through nuts 2; the inner groove flange 7 is matched with an inner boss flange 9 through a fixing bolt 10. As shown in fig. 1, in the present device, the groove flange means that a notch is arranged at a position of the flange close to the connection pipe, and the boss flange is provided with a protrusion at a corresponding position, the protrusion is matched with the notch, and the distance between the protrusion and the notch is adjusted to apply pressure to the sealing ring clamped at the middle gap to force the sealing ring to deform, so that the pressure at the connection pipe is increased, that is, a reliable sealing effect is achieved, and the present device is suitable for a certain out-of-roundness and surface roughness.
Preferably: and a test hole communicated with the tester is formed in the outer groove flange 3.
Preferably: the inner diameters of the outer groove flange 3 and the outer boss flange 5 are slightly larger than the outer diameter of the first connecting pipe; the inner diameter of the outer sealing ring 4 should be slightly smaller than the outer diameter of the first adapter tube.
Preferably: the outer diameters of the bosses of the inner concave groove flange 7 and the inner boss flange 9 are slightly smaller than the inner diameter of the second connecting pipe; the outer diameter of the inner sealing ring 8 is slightly larger than the inner diameter of the second connecting pipe.
The slightly smaller is to ensure that the sealing ring can slide freely without affecting sealing when the clearance is matched, and the slightly larger is to ensure that the sealing ring has better initial sealing performance, can be easily placed and moved in a corresponding small range, and the difference value is usually within the range of 0.2-0.5 mm.
Preferably: the outer groove flange 3, the outer boss flange 5 and the inner boss flange 9 are provided with a plurality of through holes corresponding to the central holes and used for matching the stepped screw rod 1; the size of the middle step of the stepped screw rod 1 is larger than the size of the threads at two ends, the formed step is respectively matched with the outer boss flange 5 and the inner boss flange 9, the length of the step part is matched with the length of the expansion joint of the metal corrugated pipe for the falling film pipe, the expansion joint is ensured to be the initial length after the whole assembly of the test device, and the original length is kept to be not compressed in the test process. When the screw rod is stressed and stretched, the outer groove flange 3 and the inner boss flange 9 at two ends are positioned under the action of the stepped screw rod 1, so that the stretching is limited.
The test method of the device of the invention is as follows:
s1, installation: the inner sealing ring 8 is arranged in a groove of the inner groove flange 7, the inner boss flange 9 is connected with the inner groove flange 7 and the inner sealing ring 8 together by using a fixing bolt 10, and the inner sealing ring 8 is kept in a loose state so as to ensure that the inner sealing ring 8 can easily enter the second connecting pipe; the stepped screw 1 penetrates through a through hole of the inner boss flange 9 and is fastened by the nut 2, so that the stepped screw 1 is prevented from loosening; assembling the second connecting pipe end of the expansion joint of the corrugated pipe to the inner groove flange 7, ensuring that the end face of the second connecting pipe is in close contact with the inner boss flange 9, and continuously fastening the fixing bolt 10 until the inner sealing ring 8 is compressed and deformed to form sealing with the inner surface of the second connecting pipe; and an outer boss flange 5, an outer sealing ring 4 and an outer groove flange 3 are sequentially arranged at the first connecting pipe end, and finally the outer groove flange 3 and the stepped screw rod 1 are fastened by a nut 2 until the outer sealing ring is compressed and deformed to form sealing with the outer surface of the first connecting pipe. I.e. the installation is complete.
S2, pressure resistance test: the pressure source is connected and sealed with the threaded hole 31 reserved in the outer groove flange 3 through a quick connector and the like, pressure medium is filled in the threaded hole, and pressure is maintained for a certain time. The expansion joint should not leak under the specified pressure, the structure should not have obvious deformation, the bellows should not have the unstability phenomenon. The maximum change rate of the wave pitch before and after pressurization is not more than 15%.
The structure of the invention can keep the expansion joint of the corrugated pipe in the original length state after being assembled, is not compressed or stretched, is axially limited, does not generate axial stretching deformation in the process of a pressure resistance test, and reduces the subsequent shaping work. Meanwhile, the structure is different from the common self-sealing generated by deformation of the sealing ring under the action of pressure, the structure ensures that the sealing ring is sealed with a rough rusted surface by forcing the sealing ring to generate large deformation, the sealing force can be adjusted, and the sealing reliability is high. The sealing structure can adapt to the pressure resistance test and the air tightness test of various expansion joint products welded by the corrugated pipe and the straight pipe connecting pipe, and a sealing mode of welding a blind plate at the straight port end is not needed. The pressure test device can be repeatedly used, is convenient and quick to test, greatly improves the production efficiency and saves the production cost.
Claims (5)
1. Falling liquid film is with metal bellows expansion joint pressure resistance test device, the bellows expansion joint is taken over including the first takeover, the grommet, bellows, the second that the throat was handled, its characterized in that: the test device comprises an outer groove flange (3) and an outer boss flange (5) which are matched with the outer diameter of the first connecting pipe, and an inner groove flange (7) and an inner boss flange (9) which are matched with the inner diameter of the second connecting pipe; an outer sealing ring (4) is arranged at the matching position of the outer groove flange (3) and the outer boss flange (5) at the outer side of the first connecting pipe, and an inner sealing ring (8) is arranged at the matching position of the inner groove flange (7) and the inner boss flange (9) at the inner side of the second connecting pipe; the screw is characterized by further comprising a stepped screw (1), wherein one end of the stepped screw is matched with the outer groove flange (3) and the outer boss flange (5), the other end of the stepped screw is matched with the inner boss flange (9), and the stepped screw is locked on the step of the stepped screw (1) through nuts (2); the inner groove flange (7) is matched with the inner boss flange (9) through a fixing bolt (10).
2. The test device of claim 1, wherein: and a test hole communicated with the tester is formed in the outer groove flange (3).
3. The test device of claim 1, wherein: the inner diameters of the outer groove flange (3) and the outer boss flange (5) are slightly larger than the outer diameter of the first connecting pipe; the inner diameter of the outer sealing ring (4) is slightly smaller than the outer diameter of the first connecting pipe.
4. The test device of claim 1, wherein: the outer diameters of bosses of the inner concave groove flange (7) and the inner boss flange (9) are slightly smaller than the inner diameter of the second connecting pipe; the outer diameter of the inner sealing ring (8) is slightly larger than the inner diameter of the second connecting pipe.
5. The pressure resistance test method of the metal corrugated pipe expansion joint for the falling film pipe adopts the test device according to any one of claims 1 to 4, and is characterized in that: the method comprises the following steps:
s1, installation: the inner sealing ring is arranged in a groove of the inner groove flange, the inner boss flange, the inner groove flange and the inner sealing ring are connected together by using a fixing bolt, and the inner sealing ring is kept in a loose state so as to ensure that the inner sealing ring can easily enter the second connecting pipe; the stepped screw rod penetrates through a through hole of the inner boss flange and is fastened by a nut, so that the stepped screw rod is prevented from loosening; assembling the second connecting pipe end of the expansion joint of the corrugated pipe to the inner groove flange, ensuring that the end face of the second connecting pipe is in close contact with the inner boss flange, and continuously fastening the fixing bolt until the inner sealing ring is compressed and deformed to form sealing with the inner surface of the second connecting pipe; sequentially installing an outer boss flange, an outer sealing ring and an outer groove flange at the first connecting pipe end, and finally fastening the outer groove flange and the stepped screw rod to the outer sealing ring to form sealing with the outer surface of the first connecting pipe after the outer groove flange and the stepped screw rod are compressed and deformed by nuts, namely completing installation;
s2, test: and connecting the pressure source with a threaded hole reserved in the outer groove flange through a quick connector, filling a pressure medium, and maintaining the pressure for a specified time to complete the test.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910996725.3A CN110595876A (en) | 2019-10-19 | 2019-10-19 | Metal corrugated pipe expansion joint pressure resistance test device and test method for falling film pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910996725.3A CN110595876A (en) | 2019-10-19 | 2019-10-19 | Metal corrugated pipe expansion joint pressure resistance test device and test method for falling film pipe |
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| CN110595876A true CN110595876A (en) | 2019-12-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959858A (en) * | 2021-11-16 | 2022-01-21 | 沈阳仪表科学研究院有限公司 | Metal bellows stability test device |
| CN114636615A (en) * | 2022-05-18 | 2022-06-17 | 太原理工大学 | Clamp for local buckling test of thin-wall hose under compressive load |
| CN114669070A (en) * | 2022-04-07 | 2022-06-28 | 烟台东化新材料有限公司 | Method for replacing shell gasket of vertical scraper evaporator |
| CN114813381A (en) * | 2022-06-29 | 2022-07-29 | 江苏泓源环保科技有限公司 | Rubber expansion joint hydrostatic test blind plate force resisting device |
| CN115555765A (en) * | 2022-09-16 | 2023-01-03 | 西安航天动力研究所 | Bellows type end face seal static ring welding auxiliary and air tightness inspection device and method |
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