CN202057236U - Connection structure of heat exchange tube and tube plate - Google Patents

Connection structure of heat exchange tube and tube plate Download PDF

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Publication number
CN202057236U
CN202057236U CN 201120155330 CN201120155330U CN202057236U CN 202057236 U CN202057236 U CN 202057236U CN 201120155330 CN201120155330 CN 201120155330 CN 201120155330 U CN201120155330 U CN 201120155330U CN 202057236 U CN202057236 U CN 202057236U
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CN
China
Prior art keywords
tube
heat exchange
heat exchanger
tube sheet
annular seal
Prior art date
Application number
CN 201120155330
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Chinese (zh)
Inventor
秦国安
张泽顺
梅奇
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四川蓝星机械有限公司
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Priority to CN 201120155330 priority Critical patent/CN202057236U/en
Application granted granted Critical
Publication of CN202057236U publication Critical patent/CN202057236U/en

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Abstract

The utility model discloses a connection structure of a heat exchange tube and a tube plate, which comprises the tube plate and the heart exchange tube. The connection structure of the heat exchange tube and the tube plate is characterized in that a length of annular seal groove and a length of internal thread are arranged on the inner wall of a heat exchange tube hole on the tube plate, wherein the distance between the inner thread and the position of a heat exchange tube opening is shorter than the distance between the annular seal groove and the position of the heat exchange groove opening. An O-shaped seal ring is sleeved on the portion of the heat exchange tube which is located inside the heat exchange tube hole, and the O-shaped seal ring is placed inside the annular seal groove to be matched with the annular seal groove and the heat exchange tube. The connection structure further comprises a thread plug, the outer wall of the thread plug is provided with thread matched with the inner thread of the tube hole on the tube plate, a hollow hole is disposed inside the thread plug, and the inner wall of the hole is matched with the outer wall of the heat exchange tube. Further, a contractive step is arranged inside the hole, a gap is reserved between the step and the heat exchange tube opening, and the hardness of the material of the thread plug is smaller than that of the tube plate. The thermal expansion amount of the connection structure in the heat exchange tube does not affect the connection between the tube plate and the heat exchange tube so that good sealing property is ensured.

Description

The syndeton of heat exchanger tube and tube sheet
Technical field
The utility model relates to the manufacturing technology of shell-and-tube heat exchanger in the pressure vessel (steel), especially a kind of structure that heat exchanger tube, tube sheet are linked together.
Background technology
In shell-and-tube heat exchanger design and the manufacturing, the connection between tube-to-tube sheet connection is crucial.To the general requirement that connects be: good airproof performance, if produce leakage in the junction, then two kinds of (medium) fluids are understood seepages together, and are accidents caused; Enough anti-pulling-out forces are arranged, otherwise under the effect of thermal (temperature difference) stress and tube side and shell side pressure reduction, the connection of tube-to-tube sheet connection can be pulled, perhaps heat exchanger tube is broken.
Existing shell-and-tube heat exchanger heat exchanger tube and the existing connected mode of tube sheet have expanded joint, welding, expanded and welded tube joint and use.
Expanded joint is with tube expander or passes through explosive expanding, the tube end and the tubesheet holes that penetrate in the tubesheet holes are swollen, make pipe reach plastic deformation, tubesheet holes generation strain, the tube sheet elastic restoring force combines tube-to-tube sheet connection securely, reach and not only seal but also can two purposes of anti-pulling-out force, its structure as shown in Figure 1.The process of expanded joint is comparatively complicated, and tube sheet works under the effect of thermal (temperature difference) stress and tube side and shell side pressure reduction for a long time, expands mouthful to lose efficacy easily, in generation slit, junction or pull.
Welding directly is welded in heat exchanger tube on the tube sheet, exactly as shown in Figure 2.The advantage of welding is: do not slot in the tubesheet holes, so make simpler; Connect reliably, still can keep sealing under the high temperature; Welding plays certain booster action to tube sheet.Its shortcoming is: have certain clearance (formation dead band) between tube-to-tube sheet connection, do not flow at the gap inner fluid, be easy to generate couple corrosion, adopt when the two ends pipe under the situation of welding, if thermal expansion amount is big, and, then be easy to tube sheet and pipe are pulled or pipe is broken because technological reason can not adopt expansion joint to carry out thermal compensation again.
Under HTHP or the occasion of gapped corrosion, the sealing property occasion of having relatively high expectations, the heat exchanger that bears workplaces such as vibrations, fatigue load, because the pipe end condition of work is abominable, in order to obtain better to connect effect, when connecting heat exchanger tube and tube sheet, should adopt expanded and welded tube joint and usage, the structure of welding position as shown in Figure 3, comprise tube sheet 1, heat exchanger tube 2 and expansion arc 3, the end of heat exchanger tube and tube sheet 1 weld together.Those skilled in the art also progressively improve expanded and welded tube joint and usage in the production implementation process, for example Chinese invention patent 201010197217.8, disclosed expanded and welded tube joint and usage in a kind of weldering system technology of double tube plate heat exchanger equipment, the tube sheet that adopts this structure to be connected with method can improve the anti-fatigue performance of tube-to-tube sheet connection joint, eliminate corrosion and stress corrosion that the gap produces, so service life is than simple expanded joint or weld much longer.
When needs guarantee tube sheet and heat exchanger tube is not influenced by the thermal expansion amount of heat exchanger tube and can not on equipment expansion joint be set owing to the device structure reason time, above-mentioned syndeton and method are just no longer suitable.Therefore, being connected of pipe under the specific process conditions that does not allow to weld with expanded joint and tube sheet just becomes the difficult problem that shell-and-tube heat exchanger manufactures and designs.
The utility model content
The purpose of this utility model is: provide to be different from the conventional another kind of heat exchanger tube that connects and the syndeton of tube sheet, it is identical and pressure is equal substantially to be used for solving the medium of shell-and-tube heat exchanger equipment at the tube sheet two ends, the resistance drop that pressure differential just produces owing to the pipeline of flowing through, its resistance drop is very little, greatly in 0.2MPa; The tube sheet two ends allow under the applying working condition of micro-leakage situation, and in the time of can not on equipment, expansion joint being set owing to the device structure reason, do not allow to adopt the method for expanded joint or welding to come the tube sheet of tube connector shell heat exchanger and heat exchanger tube not influenced by the thermal expansion amount of heat exchanger tube to guarantee tube sheet and heat exchanger tube.
1, the syndeton of a kind of heat exchanger tube and tube sheet, comprise tube sheet and heat exchanger tube, it is characterized in that: the heat exchange pore inwall on tube sheet has one section annular seal groove and one section internal thread, wherein internal thread is nearer from the position of the heat exchange mouth of pipe than annular seal groove, on the annular seal groove groove apart from the nearest end face of tube sheet opening and the distance between the tube sheet opening greater than 20 mm, the length of internal thread is more than or equal to 20mm; Be positioned at heat exchanger tube and be with " O " type sealing ring on the heat exchange pore inner segment, " O " type sealing ring is placed in the annular seal groove and cooperates with annular seal groove and heat exchanger tube, this syndeton also comprises a screw plug, the screw plug outer wall has the screw thread that matches with pore internal thread on the tube sheet, there is the hole of a hollow screw plug inside, the inwall in hole cooperates with the heat exchanger tube outer wall, and the step that a contraction is arranged in the hole, leave the gap between this step and the heat exchange mouth of pipe, the material hardness of screw plug is lower than tube sheet.
Supplementary technology scheme of the present utility model is as follows:
Preferably, more than the big 3mm of external diameter of the width of annular seal groove than " O " type sealing ring.
The beneficial effects of the utility model are: this syndeton is connected heat exchanger tube and tube sheet with screw plug with the syndeton that " O " type sealing ring cooperates, because screw plug can be installed at last, make annular seal groove processing and " O " type sealing ring assembling process become more convenient, guarantee processing and assembly precision, can guarantee the good seal performance of heat exchanger tube and tube sheet, solved the problem that independent employing " O " type sealing ring can't reach seal request, and the thermal expansion amount of heat exchanger tube can not influence being connected of tube sheet and heat exchanger tube.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the schematic diagram of expanded joint structure in the prior art.
Fig. 2 is a welded schematic diagram in the prior art.
Fig. 3 is the schematic diagram of expanded and welded tube joint and usage syndeton in the prior art.
Fig. 4 adopts the part schematic diagram that heat exchanger tube is connected with tube sheet in specific embodiment of the inventive method.
The specific embodiment
Specific embodiment of the utility model 1, the syndeton of heat exchanger tube and tube sheet, as shown in Figure 4, main body is by tube sheet 1, heat exchanger tube 2, screw plug 5, " O " type sealing ring 4 combines, heat exchange pore inwall on tube sheet 1 has one section annular seal groove and one section internal thread, wherein internal thread is nearer than the position of ring packing slot pitch heat exchanger tube mouth apart from the position of the heat exchange mouth of pipe (that is tube sheet end face), be positioned at heat exchanger tube 2 and be with " O " type sealing ring 4 on the heat exchange pore inner segment, " O " type sealing ring 4 cooperates with annular seal groove and heat exchanger tube, this syndeton also comprises a screw plug 5, screw plug 5 outer walls have the screw thread that matches with pore internal thread on the tube sheet, there is the hole of a hollow screw plug inside, the inwall in hole cooperates with heat exchanger tube 2 outer walls, and the step that a contraction is arranged in the hole, leave the gap between this step and the heat exchange mouth of pipe, this gap is in order to guarantee the needed space of heat exchanger tube free wxpansion, and the material hardness of screw plug is lower than tube sheet.
Specific embodiment below with reference to heat exchange tube sheet in the combination ammonia cooler is set forth technical scheme of the present invention and beneficial effect:
Choose tube sheet, the material requirements of tube sheet 1: tube sheet material is mainly determined by factors such as the feasibility of the service condition (comprising design temperature, design pressure, dielectric property and operating feature) of equipment, material welding performance, manufacturing process and economic rationalities.The medium that is used to make up ammonia cooler is: shell side exhaust gas, tube side circulating air; Tube sheet two ends media operation temperature: the hot junction is 38 ℃, and cold junction is-6 ℃; The design temperature at tube sheet two ends is-20~66 ℃; The operating pressure at tube sheet two ends is 14.1MPa, and the design pressure at tube sheet two ends is 15.5MP, and the design pressure of this tube sheet is pressed the pressure reduction of 0.25MPa and determined; Selected tube sheet material is 16MnDIV, and the chemical composition of forging and mechanical performance should meet the regulation among the JB4727 " low-temperature pressure container low-alloy steel forging ".The thickness requirement of tube sheet 1: tube plate thickness carries out the definite thickness that needs of intensity calculating according to the applying working condition of equipment, and the annular seal groove that pore need be processed on tube sheet and internal thread syndeton determine be connected length (structural thickness that promptly needs), get the final thickness of its said two devices thickness sum as tube sheet, tube plate thickness is 75mm in this example.
Processing heat exchange pore on tube sheet 1, the heat exchange pore spread pattern of tube sheet 1: according to requiring among the GB151: the arrangement mode of heat exchanger tube has equilateral triangle, square, corner equilateral triangle, four kinds of arrangement modes of corner square; Comb mode in this example is an equilateral triangle, and the heat exchange pore is 267-φ 19.25 , heat exchanger tube specification φ 19 * 2, after the drilling of tubesheet permission bridge width of (bore eventually side) 〉=96% necessary 〉=19.75mm, the minimum bridge width of permission (≤4% bridge number) is 10.48mm.The heat exchange pore of tube sheet 1 requires: for reducing flowing of medium, the size and the tolerance of tube sheet pore are determined according to regulation among the GB151 according to the heat exchanger tube specification.
The requirement of annular seal groove: the external diameter of groove is chosen according to the specification of " O " type sealing ring, and the diameter of its groove is more bigger than " O " type sealing ring.Hole in this example is φ 28.7 + 0.050, the external diameter φ 28.65 of " O " type sealing ring + 0.1, the internal diameter of " O " type sealing ring is φ 18.65 + 0.1, more smaller than heat exchanger tube external diameter; The width of groove is than the big 3mm of " O " type sealing ring, and groove is determined after reach has been determined according to experimental result in the position of pore.Reserve certain clearance between tube sheet 1 and screw plug 5 assemblings, it mainly is space length size in order to guarantee that heat exchanger tube needs owing to thermal expansion, because the material of heat exchanger tube and heat exchanger shell is different, its thermal expansion amount is also different under the operation operating mode, in heat exchanger, often adopt the method that on shell-side cylinder, adds expansion joint, and the particularity of combination ammonia cooler technology can not adopt the method that adds expansion joint on shell-side cylinder, this gap is exactly the space of reserving for the thermal expansion of heat exchanger tube, it is 4mm that the combination ammonia cooler is reserved thermal expansion length, promptly after installation, the distance between the medial surface of the step of screw plug 5 and the heat exchanger tube open end is 4mm.
The heat exchanger tube internal thread hole of tube sheet 1 requires: the length of internal thread hole is one of important factor of heat exchanger tube and tube sheet sealing effectiveness, and internal thread length is 22mm in this example.The thread size tolerance is pressed GB/T196-2003, and tolerance is pressed GB/197-2003.
The requirement of heat exchanger tube 2: choose according to high accuracy level drawn tube, do not allow splicing, require to surpass the spy and the water pressure test by root, heat exchanger tube external diameter and wall thickness deviation are controlled by the tight person of GB151 and heat exchange tube material both criteria, for guaranteeing the sealing of tube sheet and pipe, the surfaces externally and internally of pipe must be smooth, bright straight, do not allow buckling phenomenon to exist, impression, pit, crackle can not be arranged, fold, scab, layering, pull with any defective that influences poling such as concavo-convex and exist, the oxide skin of surfaces externally and internally must be removed totally.Be used to make up that flow media is that circulating air, the outer flow media of pipe are exhaust gas in the pipe of heat exchanger tube of ammonia cooler, medium temperature is-6~38 ℃, and selected heat exchanger tube is material 20 steel, and the tube material standard must meet material standard GB6479-2000.
The hardness of the material of screw plug 5 must be lower than tube sheet, and the screw plug material that is used to make up ammonia cooler in this example is 16Mn.
The material of " O " type sealing ring 4 must satisfy dielectric property (temperature, pressure, corrosivity), and appearance and size, material and performance indications are carried out selection according to " GB-1235-76 " standard.The material that is used to make up " O " type sealing ring 4 of ammonia cooler is a fluorubber, and its sizing material group is an III-1.
Screw plug of choosing in this example 5 and heat exchange pore matching thread length through evidence, can reach leak free effect greater than 22mm.
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
The utility model is not limited to the aforesaid specific embodiment.The utility model expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.

Claims (2)

1. the syndeton of heat exchanger tube and tube sheet, comprise tube sheet and heat exchanger tube, it is characterized in that: the heat exchange pore inwall on tube sheet has one section annular seal groove and one section internal thread, wherein internal thread is nearer from the position of the heat exchange mouth of pipe than annular seal groove, on the annular seal groove groove apart from the nearest end face of tube sheet opening and the distance between the tube sheet opening greater than 20 mm, the length of internal thread is more than or equal to 20mm; Be positioned at heat exchanger tube and be with " O " type sealing ring on the heat exchange pore inner segment, " O " type sealing ring is placed in the annular seal groove and cooperates with annular seal groove and heat exchanger tube, this syndeton also comprises a screw plug, the screw plug outer wall has the screw thread that matches with pore internal thread on the tube sheet, there is the hole of a hollow screw plug inside, the inwall in hole cooperates with the heat exchanger tube outer wall, and the step that a contraction is arranged in the hole, leave the gap between this step and the heat exchange mouth of pipe, the material hardness of screw plug is lower than tube sheet.
2. the syndeton of heat exchanger tube according to claim 1 and tube sheet is characterized in that: more than the big 3mm of external diameter of the width of annular seal groove than " O " type sealing ring.
CN 201120155330 2011-05-16 2011-05-16 Connection structure of heat exchange tube and tube plate CN202057236U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305572B (en) * 2011-05-16 2012-12-12 四川蓝星机械有限公司 Connection structure and connection method of heat exchange tube and tube plate
CN105854736A (en) * 2016-03-31 2016-08-17 湖南安淳高新技术有限公司 An isothermal reactor
CN105854588A (en) * 2016-03-31 2016-08-17 湖南安淳高新技术有限公司 A sulfur recovering isothermal reactor and a process thereof
CN105910474A (en) * 2016-06-29 2016-08-31 李志典 Multi-pipe-plate heat exchanger
CN106704716A (en) * 2017-01-10 2017-05-24 青岛安能电力环保设备有限公司 Detachable multi-cavity connecting piece sealing structure
CN108507401A (en) * 2018-03-12 2018-09-07 孔瑞清 Pipe heat exchanger and its application in biomedical product production technology

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305572B (en) * 2011-05-16 2012-12-12 四川蓝星机械有限公司 Connection structure and connection method of heat exchange tube and tube plate
CN105854736A (en) * 2016-03-31 2016-08-17 湖南安淳高新技术有限公司 An isothermal reactor
CN105854588A (en) * 2016-03-31 2016-08-17 湖南安淳高新技术有限公司 A sulfur recovering isothermal reactor and a process thereof
CN105854588B (en) * 2016-03-31 2019-05-21 湖南安淳高新技术有限公司 A kind of sulfur recovery isothermal reactor and its technique
CN105910474A (en) * 2016-06-29 2016-08-31 李志典 Multi-pipe-plate heat exchanger
CN106704716A (en) * 2017-01-10 2017-05-24 青岛安能电力环保设备有限公司 Detachable multi-cavity connecting piece sealing structure
CN108507401A (en) * 2018-03-12 2018-09-07 孔瑞清 Pipe heat exchanger and its application in biomedical product production technology

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