CN107449314B - A kind of metallic sheath float tube sealing structure - Google Patents

A kind of metallic sheath float tube sealing structure Download PDF

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Publication number
CN107449314B
CN107449314B CN201710604734.4A CN201710604734A CN107449314B CN 107449314 B CN107449314 B CN 107449314B CN 201710604734 A CN201710604734 A CN 201710604734A CN 107449314 B CN107449314 B CN 107449314B
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China
Prior art keywords
metallic sheath
pedestal
shell
cylinder
plane
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CN201710604734.4A
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Chinese (zh)
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CN107449314A (en
Inventor
魏振文
崔建波
于国庆
金延超
王啸
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QINGDAO DORIGHT CO Ltd
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QINGDAO DORIGHT CO Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00Arrangements for sealing leaky tubes and conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2230/00Sealing means

Abstract

A kind of metallic sheath float tube sealing structure, by pedestal, metallic sheath, shell, the composition such as dustproof cover;Pedestal is fixed on above the tubesheet holes of tube sheet;Contact surface interference fit in metallic sheath lower end is mounted in the inner cylinder face of pedestal, and the contact surface interference fit of metal set upper side covers on heat exchanger tube smooth, cylindrical peripheral surface;Upper-end contact face and lower end contact surface of the present invention metallic sheath, are designed as arc surface;Arc surface is a closed circular contact line to the close contact on cylindrical surface, when installation has a decentraction to have inclination angle, contact line or a closed curve, ellipse is slightly only become a little by circle, the sealing of the interference combination of normal design is not influenced, the solution for the problem of this exchange heat pipe destroys sealing because of out of plumb tube sheet has huge help, the present invention also increases an operation boss outside metallic sheath, an external screw thread is also additionally arranged on pedestal, this is not only helpful to the reasonable installation of metallic sheath, the not damaged disassembly of metallic sheath is even more realized for the first time.

Description

A kind of metallic sheath float tube sealing structure
Technical field
The present invention relates to the float tube sealing structures of a kind of chemical industry equipment, especially carbon black air preheater.
Background technique
(patent No.: being 2015101114057) that grip exists to metallic sheath float tube sealing structure well known to carbon black air preheater Metallic sheath on heat exchanger tube, is mounted in tubesheet holes, the upper end of metallic sheath and Tube-sheet Welding, and tubesheet holes is stretched out in lower end;Metallic sheath Most of length all has gap with heat exchanger tube, only in bottom has one section of inwardly projecting smooth inner cylinder face, it and heat exchanger tube Smooth external cylindrical surface interference fit, metallic sheath holds heat exchanger tube tightly whereby and reaches close airtight.But this well known float tube Sealing structure, the float tube that real " close airtight " can not be completed in practice seal task, the reason is as follows that: carbon black air is pre- The heat exchanger tube of hot device is formed by the different tube welding of multistage material, whole root canal without overall processing straightness certainly not It is good, put in this section of heat exchanger tube in tubesheet holes, it is most bad with tube sheet verticality, in order to eliminate that verticality is bad and bring not Benefit influences, and special provision " installs metallic sheath after first installing heat exchanger tube, tries to ensure that gold when installing metallic sheath in mounting process Belong to the concentricity of set with heat exchanger tube ";But this mounting process do not account for it is thorough, be between metallic sheath and tubesheet holes there are Gap is adjusted, metallic sheath will be finally welded on tube sheet, and after a lap welding seam weld is complete, this concentricity adjusted is shouldered But the huge pulling force of weld seam and be finally deteriorated, concentricity does not reach requirement, prevent the smooth, cylindrical peripheral surface of metallic sheath from Heat exchanger tube smooth, cylindrical peripheral surface is bonded comprehensively, necessarily leads to gas leakage gap, even small gas leakage gap, can also make float tube sealing knot The sealing performance of structure is had a greatly reduced quality.
Summary of the invention
To solve the above-mentioned problems, the present invention changes existing float tube sealing structure, is that metallic sheath is allowed to get rid of welding first, It is secondary be change metallic sheath shape and construction, allow its shape and construction be more advantageous to float tube sealing structure sealing performance and can Operability.
The technical solution adopted by the present invention to solve the technical problems is: a kind of metallic sheath float tube sealing structure, by pedestal (1), metallic sheath (2), shell (3), dustproof cover (4) and fiberfill (5) composition;It is characterized in that: pedestal (1) is an annular seating, There are periphery, inner hole surface, baseplane and upper plane (s), one section of straight-through smooth inner cylinder face above is processed in inner hole surface (k) and the root plane (w) of inner cylinder face one section of straight-through external screw thread (m) above and externally threaded, is processed on periphery Root plane (c);The medium position of metallic sheath (2) projects radially outward the operation for having upper plane (d) and lower plane (e) The upper end of boss, metallic sheath protrudes inwardly from one piece of smooth arc surface (f), and metallic sheath lower end protrudes outward one piece of smooth arc surface (g);Shell (3) is processed into thick-walled pipe, and three inner cylinder faces of Continuous maching, minimum are straight from the top down on the inner wall of pipe Diameter in upper end, slightly larger diameter in centre, maximum gauge in lower end;It connects slightly larger and two inner cylinder faces of maximum gauge It is a step (n);One section, which is processed, on the maximum gauge inner cylinder face of shell lower end leads directly to following screw thread (m);Shell upper There is spanner with outer six aspect (h);Between pedestal, metallic sheath and shell and their positional relationships between tube sheet and heat exchanger tube As follows: pedestal is installed and is welded on above the tubesheet holes of tube sheet (B);Outwardly projecting smooth arc surface (g) mistake in metallic sheath lower end It is full of and is fitted in the smooth inner cylinder face (k) of pedestal, inwardly projecting smooth arc surface (f) interference fit in metal set upper side It covers on heat exchanger tube smooth, cylindrical peripheral surface;Shell lower thread (m) is screwed into thread root plane (c) on whorl of base (m) Until;Interior of shell step (n) can prevent metallic sheath movable upwards, and the smooth inner cylinder face (k) of pedestal is skidded off to prevent metallic sheath; The root plane (w) of pedestal inner cylinder face can prevent metallic sheath from moveing downward, to guarantee lower plane (e) and the bottom of metallic sheath boss Seat upper plane (s) between, have it is enough apart from placement tool, to dismantle metallic sheath;Between other parts and part that do not mention There is free gap appropriate, to guarantee that free inclination degree appropriate is being installed and had in metallic sheath;The present invention changes The installation method of metallic sheath tube chamber welds with base in the upper surface of tube sheet, then is mounted on metallic sheath in the inner cylinder face of pedestal;This hair It is bright that the upper end of metallic sheath is all designed with the contact surface of heat exchanger tube, the contact surface of the inner cylinder face of the lower end and pedestal of metallic sheath At the arc surface on longitudinal profile;And arc surface is a closed circular contact line to the close contact on cylindrical surface, works as phase When mutually installation has a decentraction to have inclination angle, contact line or a closed curve only slightly become ellipse by round A little exactly, sealing is certain out of question for circle, this is to solving the problems, such as that heat exchanger tube out of plumb tube sheet has huge help;Certainly, mutually There is a decentraction to have the installation at inclination angle, relative to aclinic concentric installation, the holding strength of mutual interference combination is had Point influences, if the influence of metallic sheath exchange heat pipe interference combination is to tend to increase enclasping force, if metallic sheath is to pedestal interference combination Influence be to tend to reduce enclasping force, still, if the pitch angle control of decentraction in a certain range, the holding of interference combination The variable quantity of power does not influence the sealing performance of the interference combination of normal design with regard to very little, and float tube sealing structure of the present invention, exactly It can be the pitch angle control of decentraction in small range of structure;Therefore, the imperfect problem of the leakproofness of float tube sealing structure will It is solved;The present invention increases an operation boss since metallic sheath is mounted on pedestal outside metallic sheath, also An external screw thread is additionally arranged on pedestal, this three are altogether, and it is not only helpful to the reasonable installation of metallic sheath, it is even more real for the first time The not damaged disassembly of existing metallic sheath.
The beneficial effects of the present invention are: present invention changes the installation method of metallic sheath, the lower end of metallic sheath is installed In the inner cylinder face of pedestal;The present invention sets the contact surface of metal set upper side heat exchanging pipe and lower end to the contact surface of pedestal Count into arc surface;So, the installation of the installation of metallic sheath and heat exchanger tube, metallic sheath and pedestal just has reply a little not There is solution of the inclination angle problem without influencing sealing with one heart, to solving the problems, such as that heat exchanger tube out of plumb tube sheet has huge side It helps, therefore, the imperfect problem of the leakproofness of float tube sealing structure will be solved;The two, present invention are due to metallic sheath It is mounted on the base, an operation boss is increased outside metallic sheath, an external screw thread is also additionally arranged on pedestal, this three Altogether, not only helpful to the reasonable installation of metallic sheath, the not damaged disassembly of metallic sheath is even more realized for the first time, can be user Maintenance of equipment save substantial contribution.
Detailed description of the invention
Fig. 1 is a kind of metallic sheath float tube sealed structural schematic diagram of the present invention and embodiment.
Fig. 2 is Fig. 1 " I " enlarged drawing.
Fig. 3 is to assume heat exchanger tube A to the installation effect figure of tube sheet B out of plumb in Fig. 1.
1. pedestal in Fig. 1,2. metallic sheaths, 3. shells, 4. dustproof covers, 5. fiberfill, A. heat exchanger tube, B. tube sheet.
The upper plane of s. pedestal in Fig. 2, the smooth inner cylinder face on k. pedestal, the root of the smooth inner cylinder face on w. pedestal Facial planes, the external screw thread on m. pedestal, the externally threaded root plane on c. pedestal, the upper plane of station on d. metallic sheath, E. on metallic sheath station lower plane, the inwardly projecting smooth arc surface in f. metal set upper side, g. metallic sheath lower end is to evagination Smooth arc surface out, a step of n. interior of shell, the internal screw thread of m. shell lower end, the die nut of h. shell upper Face.
Specific embodiment
A kind of metallic sheath float tube sealing structure of the present invention be by pedestal (1), metallic sheath (2), shell (3), dustproof cover (4) and Fiberfill (5) composition.Pedestal is installed and is welded on tube sheet (B);Metallic sheath lower end is mounted on the inner cylinder face (k) of pedestal In, metal set upper side covers on heat exchanger tube smooth, cylindrical peripheral surface;Shell lower thread (m) is spun on whorl of base (m), and screw thread Until being screwed into bottom;
Installation of the pedestal on tube sheet should look after the concentricity of pedestal and tubesheet holes;One can be processed in the top of shell A external screw thread, to install dustproof cover.

Claims (1)

1. a kind of metallic sheath float tube sealing structure, by pedestal (1), metallic sheath (2), shell (3), dustproof cover (4) and fiberfill (5) it forms;It is characterized in that: pedestal (1) is an annular seating, there are periphery, inner hole surface, baseplane and upper plane (s), in inner hole surface The root plane (w) of the straight-through smooth inner cylinder face (k) and inner cylinder face above of one section of upper processing, processes one on periphery External screw thread (m) and externally threaded root plane (c) above Duan Zhitong;The medium position of metallic sheath (2) projects radially outward one A operation boss with upper plane (d) and lower plane (e), the upper end of metallic sheath protrude inwardly from one piece of smooth arc surface (f), gold Belong to set lower end and protrudes outward one piece of smooth arc surface (g);Shell (3) is processed into thick-walled pipe, from upper on the inner wall of pipe Downward three inner cylinder faces of Continuous maching, minimum diameter in upper end, slightly larger diameter in centre, maximum gauge in lower end; Connecting slightly larger and two inner cylinder faces of maximum gauge is a step (n);Add on the maximum gauge inner cylinder face of shell lower end One section of work leads directly to following screw thread (m);Shell upper has spanner with outer six aspect (h);Between pedestal, metallic sheath and shell and Their positional relationships between tube sheet and heat exchanger tube are as follows: pedestal is installed and is welded on above the tubesheet holes of tube sheet (B);Metal Outwardly projecting smooth arc surface (g) interference fit in set lower end is mounted in the smooth inner cylinder face (k) of pedestal, metal set upper side Inwardly projecting smooth arc surface (f) interference fit covers on heat exchanger tube smooth, cylindrical peripheral surface;Shell lower thread (m) is mounted in pedestal On screw thread (m), and until being screwed into thread root plane (c);Interior of shell step (n) can prevent metallic sheath movable upwards, to prevent Metallic sheath skids off the smooth inner cylinder face (k) of pedestal;The root plane (w) of pedestal inner cylinder face can prevent metallic sheath from living downwards It is dynamic, to guarantee between the lower plane (e) of metallic sheath boss and the upper plane (s) of pedestal, have it is enough apart from placement tool, to Dismantle metallic sheath;There is free gap appropriate between other parts and part that do not mention, to guarantee that metallic sheath is being installed and used In have free inclination degree appropriate;There is one section of screw thread matched with dustproof cover (4) on the upper end external cylindrical surface of shell (3), Fiberfill (5) is wrapped on housing top end heat exchange pipe external surface, dustproof cover conpressed fibers filler is screwed.
CN201710604734.4A 2017-07-24 2017-07-24 A kind of metallic sheath float tube sealing structure Active CN107449314B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710604734.4A CN107449314B (en) 2017-07-24 2017-07-24 A kind of metallic sheath float tube sealing structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710604734.4A CN107449314B (en) 2017-07-24 2017-07-24 A kind of metallic sheath float tube sealing structure

Publications (2)

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CN107449314A CN107449314A (en) 2017-12-08
CN107449314B true CN107449314B (en) 2019-02-22

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK168684A (en) * 1983-03-28 1984-11-09 Kevin Sulzberger Process for enriching a liquid with oxygen, and a reactor for use in the process
CN201302420Y (en) * 2008-11-06 2009-09-02 青岛德固特机械制造有限公司 Sealing structure of floating pipe of air preheater
CN103672943B (en) * 2013-04-12 2016-02-17 青岛德固特节能装备股份有限公司 Air preheater float tube sealed elastic sealing shroud device
CN104713404B (en) * 2015-03-14 2016-07-06 青岛德固特节能装备股份有限公司 Vertical array tubular heat exchanger floats tube seal structure

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