CN110595876A - Pressure test device and test method for metal bellows expansion joints for falling film pipes - Google Patents
Pressure test device and test method for metal bellows expansion joints for falling film pipes 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 40
- 239000011552 falling film Substances 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 15
- 238000010998 test method Methods 0.000 title claims description 5
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000007493 shaping process Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 13
- 235000011121 sodium hydroxide Nutrition 0.000 description 6
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 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
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 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
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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
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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
- G01N3/08—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
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- 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
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Life Sciences & Earth Sciences (AREA)
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- 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
本发明公开了一种降膜管用金属波纹管膨胀节耐压力试验装置，包括外凹槽法兰和外凸台法兰，以及内凹槽法兰和内凸台法兰；在外凹槽法兰和外凸台法兰相配合位置设置有外密封圈，在内凹槽法兰和内凸台法兰相配合位置设置有内密封圈；还包括阶梯螺杆，阶梯螺杆的一端与外凹槽法兰和外凸台法兰相配合，另一端与内凸台法兰相配合，并分别通过螺母锁紧在阶梯螺杆的台阶上；所述内凹槽法兰通过固定螺栓与内凸台法兰相配合。本发明结构可以使波纹管膨胀节在装配后轴向受到限位，不会发生轴向拉伸变形，减少了后续整形工作。同时通过强制密封圈产生大变形形成密封，密封可靠性高。该装置可重复利用，方便快捷，极大地提高生产效率，节约生产成本。
The invention discloses a metal bellows expansion joint pressure resistance test device for falling film pipes, which comprises an outer groove flange, an outer boss flange, an inner groove flange and an inner boss flange; the outer groove flange There is an outer sealing ring at the matching position with the outer boss flange, and an inner sealing ring at the matching position between the inner groove flange and the inner boss flange; it also includes a stepped screw, one end of the stepped screw is connected to the outer groove method The flange is matched with the flange of the outer boss, and the other end is matched with the flange of the inner boss, and is respectively locked on the steps of the stepped screw through nuts; the inner groove flange is connected with the flange of the inner boss by fixing bolts. match. The structure of the invention can make the expansion joint of the bellows axially limited after assembly, avoid axial stretching deformation, and reduce subsequent shaping work. At the same time, the seal is formed by forcing the sealing ring to produce large deformation, and the sealing reliability is high. The device can be reused, is convenient and quick, greatly improves production efficiency and saves production cost.
Description
技术领域technical field
本发明涉及金属波纹管膨胀节的检验设备领域，具体地说是一种降膜管用金属波纹管膨胀节耐压力试验装置。The invention relates to the field of inspection equipment for metal bellows expansion joints, in particular to a pressure-resistant test device for metal bellows expansion joints for falling film pipes.
背景技术Background technique
降膜管是生产片碱的核心设备之一。降膜管由两层套管组成，夹套层物料为熔盐，最高工作温度430℃；内管层物料为碱液，两种液体逆流进行传热。碱液从分配器自上而下进入降膜管内层后，受到夹套熔盐的加热，碱液沸腾，浓缩蒸发，碱液由164.9℃液态碱液加热到411.9℃熔融碱。然后经底部汇总管至气液分离器进行分离。由于降膜管内外两层管接触的介质不同、工作温度不同，另外由于两层管的材料不同，线胀系数差别等原因造成热胀冷缩的变形量差距较大。金属波纹管膨胀节安装于降膜管外层套管，利用自身的弹性变形来补偿两层套管的变形量差异。如专利号为：201620402992.5，专利名称为：“一种降膜管用金属波纹管膨胀节”的实用新型专利，则公开了一种降膜管用金属波纹管膨胀节，包括有第一接管、衬环、波纹管、第二接管，所述第一接管的端口处为与降膜管外径相匹配的缩口结构；波纹管的波数为8～10波。其显著提高了降膜管的使用周期，满足了制碱行业对降膜管使用寿命的要求。Falling film tube is one of the core equipment for caustic soda production. The falling film tube is composed of two layers of casing, the material of the jacket layer is molten salt, and the maximum working temperature is 430°C; the material of the inner tube layer is lye, and the two liquids conduct heat transfer in countercurrent. After the lye enters the inner layer of the falling film tube from top to bottom from the distributor, it is heated by the molten salt in the jacket, the lye boils, concentrates and evaporates, and the lye is heated from a liquid lye at 164.9°C to a molten alkali at 411.9°C. Then through the bottom collecting pipe to the gas-liquid separator for separation. Due to the different media in contact with the inner and outer tubes of the falling film tube, the different working temperature, and the difference in the material of the two layers of tubes, the difference in the coefficient of linear expansion, etc., there is a large difference in the deformation of thermal expansion and contraction. The metal bellows expansion joint is installed on the outer casing of the falling film tube, and uses its own elastic deformation to compensate for the difference in deformation between the two casings. For example, the patent number is: 201620402992.5, and the patent name is: "a metal bellows expansion joint for falling film pipe" utility model patent, which discloses a metal bellows expansion joint for falling film pipe, including a first connecting pipe and a lining ring , a corrugated pipe, and a second connecting pipe, the port of the first connecting pipe is a necking structure matching the outer diameter of the falling film tube; the wave number of the bellows is 8-10 waves. It significantly improves the service life of the falling film tube and meets the requirements of the soda making industry on the service life of the falling film tube.
按照要求，降膜管用金属波纹管膨胀节出厂时应进行耐压性能试验，试验压力为0.9MPa，试验介质为水，保压15min。上述膨胀节一端为第一接管，另一端为第二接管，接管原材料规格均为φ133x6的15CrMo。第一接管经热加工缩口至φ113。接口高度45mm左右，内外表面均为非机加表面，存在一定锈蚀及不圆度。波纹管具有弹性特性，在外力作用下能够产生轴向的压缩或拉伸位移，在密封状态下，波纹管受内压时，波纹管具有伸长趋势，进行耐压力试验时应将膨胀节进行轴向方向的限位，防止波纹管拉伸。According to the requirements, the metal bellows expansion joints for falling film pipes should be tested for pressure resistance when they leave the factory. The test pressure is 0.9MPa, the test medium is water, and the pressure is maintained for 15 minutes. One end of the above-mentioned expansion joint is the first connecting pipe, and the other end is the second connecting pipe. The raw material specifications of the connecting pipes are all 15CrMo of φ133x6. The first connecting pipe shrinks to φ113 after thermal processing. The height of the interface is about 45mm, and the inner and outer surfaces are non-machined surfaces, which have certain corrosion and out-of-roundness. The bellows has elastic characteristics, and can produce axial compression or tensile displacement under the action of external force. In the sealed state, when the bellows is subjected to internal pressure, the bellows has a tendency to elongate. The expansion joint should be tested for pressure resistance. The limit in the axial direction prevents the bellows from stretching.
但目前尚没有一种较好的实验装置，可以达到上述要求。But there is still no better experimental device that can meet the above requirements.
发明内容Contents of the invention
本发明的目的是提供一种降膜管用金属波纹管膨胀节耐压力试验装置及试验方法，可针对上述膨胀节实现良好的密封及位置限定。The purpose of the present invention is to provide a pressure-resistant test device and test method for metal bellows expansion joints for falling film pipes, which can achieve good sealing and position limitation for the above-mentioned expansion joints.
本发明是通过如下技术方案实现的：降膜管用金属波纹管膨胀节耐压力试验装置，所述波纹管膨胀节包括缩口处理的第一接管、衬环、波纹管、第二接管，其特征在于：所述试验装置包括与第一接管外径相配合的外凹槽法兰和外凸台法兰，以及与第二接管内径相配合的内凹槽法兰和内凸台法兰；在第一接管外侧外凹槽法兰和外凸台法兰相配合位置设置有外密封圈，在第二接管内侧内凹槽法兰和内凸台法兰相配合位置设置有内密封圈；还包括阶梯螺杆，阶梯螺杆的一端与外凹槽法兰和外凸台法兰相配合，另一端与内凸台法兰相配合，并分别通过螺母锁紧在阶梯螺杆1的台阶上；所述内凹槽法兰通过固定螺栓与内凸台法兰相配合。The present invention is realized through the following technical scheme: a metal bellows expansion joint pressure-resistant test device for falling film pipes, the bellows expansion joint includes a first connecting pipe, a lining ring, a bellows, and a second connecting pipe that have been necked, and its features are: In that: the test device includes an outer groove flange and an outer boss flange matched with the outer diameter of the first nozzle, and an inner groove flange and an inner boss flange matched with the inner diameter of the second nozzle; An outer sealing ring is provided at the matching position between the outer groove flange on the outer side of the first connecting pipe and the outer boss flange, and an inner sealing ring is arranged on the matching position between the inner groove flange and the inner boss flange on the inner side of the second connecting pipe; It includes a stepped screw, one end of the stepped screw matches the outer groove flange and the outer boss flange, and the other end matches the inner boss flange, and is locked on the steps of the stepped screw 1 through nuts respectively; The inner groove flange cooperates with the inner boss flange through fixing bolts.
进一步的：在外凹槽法兰3上设置有与试验机相连通的测试孔。Further: a testing hole connected with the testing machine is provided on the outer groove flange 3 .
进一步的：外凹槽法兰3与外凸台法兰5的内径略大于第一接管的外径；外密封圈4的内径应略小于第一接管的外径。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 connecting pipe.
进一步的：内凹槽法兰7与内凸台法兰9的凸台外径略小于第二接管的内径；内密封圈8的外径略大于第二接管的内径。Further: the outer diameter of the boss of the inner groove flange 7 and the inner boss flange 9 is 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.
本发明的另一方案为降膜管用金属波纹管膨胀节耐压力试验方法，采用如权利要求1-4任一所述试验装置，其特征在于：该方法包括如下步骤：Another solution of the present invention is a pressure-resistant test method for metal bellows expansion joints for falling film pipes, using the test device as described in any one of claims 1-4, characterized in that: the method includes the following steps:
S1、安装：将内密封圈装入内凹槽法兰的凹槽，用固定螺栓将内凸台法兰与内凹槽法兰及内密封圈连接在一起，并保持内密封圈处于松动状态，以便保证内密封圈能够轻松进入第二接管；将阶梯螺杆穿入内凸台法兰的通孔，并用螺母紧固，防止阶梯螺杆松动；将波纹管膨胀节第二接管端装配到内凹槽法兰处，并确保第二接管端面与内凸台法兰紧密接触，将固定螺栓继续紧固至内密封圈受压缩变形与第二接管内表面形成密封；在第一接管端依次装入外凸台法兰、外密封圈及外凹槽法兰，最后用螺母将外凹槽法兰与阶梯螺杆紧固至外密封圈受压缩变形与第一接管外表面形成密封。即安装完成。S1. Installation: Put the inner sealing ring into the groove of the inner groove flange, connect the inner boss flange with the inner groove flange and the inner sealing ring with fixing bolts, and keep the inner sealing ring in a loose state , so as to ensure that the inner sealing ring can easily enter the second connecting pipe; insert the stepped screw into the through hole of the flange of the inner boss, and tighten it with nuts to prevent the stepped screw from loosening; assemble the second connecting end of the bellows expansion joint into the inner groove At the flange, and ensure that the end surface of the second connecting pipe is in close contact with the flange of the inner boss, continue to tighten the fixing bolts until the inner sealing ring is compressed and deformed to form a seal with the inner surface of the second connecting pipe; The boss flange, the outer sealing ring and the outer groove flange, and finally the outer groove flange and the stepped screw are fastened with nuts until the outer sealing ring is compressed and deformed to form a seal with the outer surface of the first connecting pipe. That is, the installation is complete.
S2、试验：将压力源与外凹槽法兰预留的螺纹孔通过快速接头进行连接，并充入压力介质，保压至规定时间，即完成试验。S2. Test: Connect the pressure source and the reserved threaded hole of the outer groove flange through a quick connector, and fill the pressure medium, keep the pressure for a specified time, and then complete the test.
本发明的优点是：本发明结构可以使波纹管膨胀节在装配后保持原始长度状态，不受压缩也不受拉伸，并且轴向受到限位，在耐压力试验过程中不会发生轴向拉伸变形，减少了后续整形工作。同时与一般的靠密封圈在压力作用下变形产生自密封不同，本结构通过强制密封圈产生大变形保证与粗糙锈蚀表面形成密封，密封力大小可以调节，密封可靠性高。该密封结构形式可适应波纹管与直管接管焊接的各种类型膨胀节产品的耐压力试验及气密性试验中，而不必再采用在直口端焊接盲板的密封方式。该压力试验装置可重复利用，试验方便快捷，极大地提高生产效率，节约生产成本。The advantages of the present invention are: the structure of the present invention can keep the bellows expansion joint at its original length after assembly, without being compressed or stretched, and the axial direction is limited, and no axial tension will occur during the pressure resistance test. Stretch deformation, reducing the follow-up plastic work. At the same time, it is different from the general self-sealing caused by the deformation of the sealing ring under pressure. This structure ensures the sealing with the rough and rusty surface by forcing the sealing ring to produce large deformation. The sealing force can be adjusted and the sealing reliability is high. The sealing structure can be used in the pressure resistance test and air tightness test of various types of expansion joints welded between bellows and straight pipes, without the need to use the sealing method of welding blind plates at the straight ends. The pressure test device can be reused, the test is convenient and fast, the production efficiency is greatly improved, and the production cost is saved.
附图说明Description of drawings
图1是本发明剖视结构示意简图。Fig. 1 is a schematic diagram of a cross-sectional structure of the present invention.
图中序号说明：1为阶梯螺杆、2为螺母、3为外凹槽法兰、4为外密封圈、5为外凸台法兰 、6为波纹管膨胀节，61为第一接管、62为波纹管、63为第二接管、7为内凹槽法兰、8为内密封圈、9为内凸台法兰、10为固定螺栓。Description of the serial numbers in the figure: 1 is the stepped screw, 2 is the nut, 3 is the outer groove flange, 4 is the outer sealing ring, 5 is the outer boss flange, 6 is the bellows expansion joint, 61 is the first connecting pipe, 62 63 is a second connecting pipe, 7 is an inner groove flange, 8 is an inner sealing ring, 9 is an inner boss flange, and 10 is a fixing bolt.
具体实施方式Detailed ways
由图1所示为本发明降膜管用金属波纹管膨胀节耐压力试验装置，所述波纹管膨胀节6包括缩口处理的第一接管61、衬环、波纹管62、第二接管63，所述试验装置包括与第一接管61外径相配合的外凹槽法兰3和外凸台法兰5，以及与第二接管63内径相配合的内凹槽法兰7和内凸台法兰9；在第一接管外侧外凹槽法兰3和外凸台法兰5相配合位置设置有外密封圈4，在第二接管内侧内凹槽法兰7和内凸台法兰9相配合位置设置有内密封圈8；还包括阶梯螺杆1，阶梯螺杆的一端与外凹槽法兰3和外凸台法兰5相配合，另一端与内凸台法兰9相配合，并分别通过螺母2锁紧在阶梯螺杆1的台阶上；所述内凹槽法兰7通过固定螺栓10与内凸台法兰9相配合。如图1所示，本装置中，凹槽法兰指的是在法兰盘靠近接管的位置设置有一缺口，而凸台法兰则在相应位置设置有一凸起，凸起与缺口相配合，通过调整两者的距离，可以对夹在中间空隙处的密封圈施加压力迫使其变形，从而增加与接管处的压力，即达到可靠的密封效果，且可适应一定的不圆度及表面粗糙度。Shown in Fig. 1 is the metal bellows expansion joint pressure-resistant test device for falling film pipes of the present invention, the bellows expansion joint 6 includes a first connecting pipe 61, a backing ring, a bellows 62, and a second connecting pipe 63 that have been shrunk. The test device includes an outer groove flange 3 and an outer boss flange 5 matched with the outer diameter of the first adapter 61, and an inner groove flange 7 and an inner boss flange matched with the inner diameter of the second adapter 63. Lan 9; an outer sealing ring 4 is arranged at the matching position between the outer groove flange 3 and the outer boss flange 5 on the outer side of the first connecting pipe, and the inner groove flange 7 and the inner boss flange 9 are matched on the inner side of the second connecting pipe. The matching position is provided with an inner sealing ring 8; it also includes a stepped screw 1, one end of the stepped screw is matched with the outer groove flange 3 and the outer boss flange 5, and the other end is matched with the inner boss flange 9, and respectively The nut 2 is locked on the step of the stepped screw 1 ; the inner groove flange 7 is matched with the inner boss flange 9 through the fixing bolt 10 . As shown in Figure 1, in this device, the groove flange means that a gap is provided at the position of the flange plate close to the connecting pipe, while the boss flange is provided with a protrusion at the corresponding position, and the protrusion matches the gap. By adjusting the distance between the two, pressure can be applied to the sealing ring clamped in the middle gap to force it to deform, thereby increasing the pressure at the joint, achieving a reliable sealing effect, and can adapt to a certain degree of out-of-roundness and surface roughness .
优选的：在外凹槽法兰3上设置有与试验机相连通的测试孔。Preferably: a testing hole communicated with the testing machine is provided on the outer groove flange 3 .
优选的：外凹槽法兰3与外凸台法兰5的内径略大于第一接管的外径；外密封圈4的内径应略小于第一接管的外径。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 connecting pipe.
优选的：内凹槽法兰7与内凸台法兰9的凸台外径略小于第二接管的内径；内密封圈8的外径略大于第二接管的内径。Preferably: the outer diameter of the boss of the inner groove flange 7 and the inner boss flange 9 is 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.
上述略小于，目的是保证间隙配合时，既能自由滑动，又不会影响密封，略大于的目的是既可以使密封圈具有较好的初始密封性，又能容易的安放和相应的小范围内移动，其差值通常在0.2-0.5mm范围以内。The purpose of the above-mentioned slightly smaller is to ensure that it can slide freely without affecting the seal when the clearance is matched. The difference is usually within the range of 0.2-0.5mm.
优选的：外凹槽法兰3、外凸台法兰5与内凸台法兰9有若干中心孔相对应的通孔用于配合阶梯螺杆1；阶梯螺杆1中部阶梯尺寸大于两端螺纹尺寸，所形成的台阶分别与外凸台法兰5和内凸台法兰9相配合，阶梯部分长度应与降膜管用金属波纹管膨胀节长度匹配，保证试验装置整体装配后膨胀节为初始长度且在试验过程中保持原始长度不被压缩。当其受力伸长时，两端的外凹槽法兰3与内凸台法兰9在阶梯螺杆1的作用下定位从而起到限制拉伸的作用。Preferably: the outer groove flange 3, the outer boss flange 5 and the inner boss flange 9 have a number of through holes corresponding to the central holes for matching the stepped screw 1; the size of the middle step of the stepped screw 1 is larger than the thread size at both ends , the steps formed are matched with the outer boss flange 5 and the inner boss flange 9 respectively, and the length of the steps should match the length of the expansion joint of the metal bellows used for the falling film pipe, so as to ensure that the expansion joint is the initial length after the overall assembly of the test device And keep the original length uncompressed during the test. When it is stretched under force, the outer groove flange 3 and the inner boss flange 9 at both ends are positioned under the action of the stepped screw 1 to limit the stretching.
本发明所述装置的试验方法如下：The test method of device of the present invention is as follows:
S1、安装：将内密封圈8装入内凹槽法兰7的凹槽，用固定螺栓10将内凸台法兰9与内凹槽法兰7及内密封圈8连接在一起，并保持内密封圈8处于松动状态，以便保证内密封圈8能够轻松进入第二接管；将阶梯螺杆1穿入内凸台法兰9的通孔，并用螺母2紧固，防止阶梯螺杆1松动；将波纹管膨胀节第二接管端装配到内凹槽法兰7处，并确保第二接管端面与内凸台法兰9紧密接触，将固定螺栓10继续紧固至内密封圈8受压缩变形与第二接管内表面形成密封；在第一接管端依次装入外凸台法兰5、外密封圈4及外凹槽法兰3，最后用螺母2将外凹槽法兰3与阶梯螺杆1紧固至外密封圈受压缩变形与第一接管外表面形成密封。即安装完成。S1. Installation: Put the inner sealing ring 8 into the groove of the inner groove flange 7, connect the inner boss flange 9 with the inner groove flange 7 and the inner sealing ring 8 with fixing bolts 10, and keep The inner sealing ring 8 is in a loose state, so as to ensure that the inner sealing ring 8 can easily enter the second connecting pipe; insert the stepped screw 1 into the through hole of the flange 9 of the inner boss, and tighten it with the nut 2 to prevent the stepped screw 1 from loosening; Assemble the second pipe end of the pipe expansion joint to the inner groove flange 7, and ensure that the second pipe end surface is in close contact with the inner boss flange 9, and continue to tighten the fixing bolts 10 until the inner sealing ring 8 is compressed and deformed to meet the first The inner surface of the two connecting pipes forms a seal; the outer boss flange 5, the outer sealing ring 4 and the outer groove flange 3 are sequentially installed at the first connecting pipe end, and finally the outer groove flange 3 and the stepped screw rod 1 are tightened with nuts 2 The outer sealing ring is compressed and deformed to form a seal with the outer surface of the first connecting pipe. That is, the installation is complete.
S2、耐压力试验：将压力源与外凹槽法兰3预留的螺纹孔31通过快速接头等进行连接密封，并充入压力介质，保压至一定时间。膨胀节在规定的压力下应无渗漏，结构应无明显变形，波纹管应无失稳现象。加压前后波距最大变化率应不大于15%。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, etc., and filled with a pressure medium to keep the pressure for a certain period of time. The expansion joint should have no leakage under the specified pressure, the structure should have no obvious deformation, and the bellows should have no instability. The maximum change rate of wave pitch before and after pressurization should not be greater than 15%.
本发明结构可以使波纹管膨胀节在装配后保持原始长度状态，不受压缩也不受拉伸，并且轴向受到限位，在耐压力试验过程中不会发生轴向拉伸变形，减少了后续整形工作。同时与一般的靠密封圈在压力作用下变形产生自密封不同，本结构通过强制密封圈产生大变形保证与粗糙锈蚀表面形成密封，密封力大小可以调节，密封可靠性高。该密封结构形式可适应波纹管与直管接管焊接的各种类型膨胀节产品的耐压力试验及气密性试验中，而不必再采用在直口端焊接盲板的密封方式。该压力试验装置可重复利用，试验方便快捷，极大地提高生产效率，节约生产成本。The structure of the present invention can keep the bellows expansion joint in its original length state after assembly, without being compressed or stretched, and the axial direction is restricted, and no axial tensile deformation occurs during the pressure resistance test, reducing the Subsequent plastic work. At the same time, it is different from the general self-sealing caused by the deformation of the sealing ring under pressure. This structure ensures the sealing with the rough and rusty surface by forcing the sealing ring to produce large deformation. The sealing force can be adjusted and the sealing reliability is high. This sealing structure can be used in the pressure resistance test and air tightness test of various types of expansion joints welded between bellows and straight pipes, without the need to use the sealing method of welding blind plates at the straight ends. The pressure test device can be reused, the test is convenient and fast, the production efficiency is greatly improved, and the production cost is saved.
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