CN102734557A - Spiral pipe fixing component and sheathing method - Google Patents
Spiral pipe fixing component and sheathing method Download PDFInfo
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- CN102734557A CN102734557A CN2012101997136A CN201210199713A CN102734557A CN 102734557 A CN102734557 A CN 102734557A CN 2012101997136 A CN2012101997136 A CN 2012101997136A CN 201210199713 A CN201210199713 A CN 201210199713A CN 102734557 A CN102734557 A CN 102734557A
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Abstract
The invention relates to a spiral pipe fixing component and a sheathing method, belonging to the technical fields of sheathing and fixation of mechanical components. The fixing component mainly consists of an internal sleeve, an internal barrel bearing strip, a bearing strip, a fixing strip, fixing screws and an external sleeve. The sheathing method comprises following steps: embedding the internal barrel bearing strip into the recess of the internal sleeve; sheathing the first layer of spiral pipe on the outer side of the internal sleeve, placing the fixing strip on the outer side of the spiral pipe, pulling each of the fixing screws through each counter bore in the fixing strip, and screwing the fixing screws into screw holes in the internal sleeve bearing strip; adjusting concentricity; spot-welding the fixing screws and the fixing strip, and flatly polishing; clamping the bearing strip of the next layer of spiral pipe on the fixing strip in order that the fixing strip is embedded into the recess of the bearing strip; and completely sheathing all the layers. A process for manufacturing and assembling the component is simple; additionally, the sheathing method involves low requirement on the manufacturing precision of the component, and results in high stability and high strength to the fixed assembling of the spiral pipes; and therefore, the sheathing method is applicable for large-scale popularization and standardization.
Description
Technical field
The invention belongs to the suit and the technique for fixing field of mechanical part; Relate to a kind of suit and fixing method of spiral coil of being used for; Fixedly possess about multi-layer structure in particular for suit, be applied to reactor steam generator, boiler, the isostructural large-scale spiral coil pipe of waste heat recovering device.
Background technique
Spiral coil is a kind of common structure, is widely used in being mainly used in and transporting fluid in the important industry such as pipeline transport, chemical industry, power industry.Simultaneously, spiral coil also is a kind of conventional design form of heat exchanger, therefore often is used in the device structures such as reactor vaporizer, boiler, waste heat recovering device.
Spiral coil, its shape facility such as Fig. 1, shown in Figure 2, for the purpose of sake of clarity, defining one group of identical spiral coil of coil diameter is one deck, the quantity of coil pipe is called a number in certain layer.Wherein Fig. 1-A is an individual layer single head spiral coil 8, has only one deck and individual tubes spiral to rise; Fig. 1-B is an individual layer twin-feed spiral coil pipe 9, is twined by two pipe spirals and rises, and also has individual layer multi-head spiral coil pipe by that analogy, is risen by many coil pipe spirals; Fig. 2-A is double-deck single head spiral coil 10, inside and outside have two-layerly, every layer is single spiral coil; 2-B is double-deck twin-feed spiral coil pipe 11, and inside and outside have two-layerly respectively, and every layer is risen by two spiral coil spirals and to constitute, and also has double-deck multi-head spiral coil pipe and multilayer multi-head spiral coil pipe by that analogy.
Manufacturing and designing of large-scale spiral coil pipe must be considered the suit and the fixation problem of spiral coil, yet there is defective in present design proposal to the consideration of this problem.These defectives mainly contain two types: the one, do not support or do very loose supporting, and handle might produce to flow causing vibration like this; The 2nd, do to have intensity, supporting closely, realize but the tightness degree of its assembling is a accuracy of manufacturing by fixed block, rather than realize that by assembling itself this will cause the manufacturing of fixed block difficult that cost is too high, even suit can't be implemented.
When the spiral coil volume is big, because the coil pipe self gravitation is also bigger, the also corresponding increase of coil pipe deformation that causes by gravity.For example, be 8g/cm when adopting density
3The material manufacture coil pipe, adopt the specification of Φ 19mm * 3mm, the gap between two coil pipes is 6mm up and down; Diameter is 1m; When the coil pipe height overall was 4m, spiral coil weight was about 2500kg, and such deadweight is enough to compress below very for a short time in the gap between two coil pipes up and down.And, when coil pipe has about multilayer architecture as shown in Figure 2, also need consider the changing of the relative positions between every layer of coil pipe, and the suit problem between layer and the layer.And existing solution; The one, insufficient strength; Even comparatively simple individual layer spiral coil, when coil pipe volume and deadweight were excessive, deadweight also was enough to self bent or supporting member is crushed; The 2nd, assembly precision all is difficult to meet the suit needs of multi-layer helical coil pipe, and the 3rd, do not limit the changing of the relative positions between the internal and external layer.
When spiral coil was used for heat exchange, the fluid-flow rate inside and outside the coil pipe was fast, and momentum is big, and the characteristics of cyclic loading are arranged.When the natural frequency of certain parts or certain one deck in the frequency that flows and the multi-layer helical coil pipe is approaching or identical, will produce resonance.Violent resonance has great influence to the life-span of spiral coil, under the extreme case, even might cause the spiral coil many places to be broken simultaneously.When the broken part of running affairs of this type occurs in the industrial boiler, will seriously reduce heat exchange efficiency; And when this type incident occurs in the reactor steam generator, will cause the water vapour of secondary circuit to get into a loop, cause serious security incident.It is extremely difficult that the geometric properties complex objects is carried out Calculation of Natural Frequencies, so the frequency of certain parts or certain one deck is not sure of in the spiral coil, can't guarantee also that therefore single parts or individual layer spiral coil stream can not take place cause vibration.Under such prerequisite, be necessary closely to connect each parts of spiral coil, make it form a fixing integral body.
Use close-connected mode; Use very little Spielpassung or the transition fit in gap between spiral coil and the fixing-assembly; Can reduce spiral coil the risk that stream causes vibration takes place; But this type scheme dependence to the accuracy of manufacturing of fixing-assembly mostly is too high, does not very likely cause the suit failure because of the component accuracy of manufacturing reaches.Therefore be necessary to design a kind of specific assembling method, both guaranteed the tightness degree of assembling, the accuracy of manufacturing of fixing-assembly is not made excessive demand again.
When spiral coil was used for hot environment, because operating temperature and fitting temperature is different, the spiral coil that assembles can produce thermal expansion.When having no constraint, spiral coil axially, hoop and radially all will produce expansion.The top of general spiral coil all is connected with other pipeline or tube sheet with the bottom, if these component locations are fixing, spiral coil thermal expansion axial and hoop all will cause the joint of these parts stressed so.
Summary of the invention
The objective of the invention is to solve existing spiral coil fixing device strength deficiency, flow vibration and the too high problems such as component accuracy of manufacturing requirement of causing.A kind of spiral coil fixing-assembly and assembling method are provided, and it is simple that this assembly is made assembly technology, and assembling method requires lower to the assembly accuracy of manufacturing, and the stability and the intensity of the fixing assembling of spiral coil are all very high, the suitable large-scale promotion column criterionization of going forward side by side.
A kind of spiral coil fixing-assembly that the present invention proposes is characterized in that this assembly mainly is made up of inner sleeve, inner core load-bearing bar, load-bearing bar, fixed strip, set screw and outer sleeve, and the concrete structure of each parts is following:
Set screw 6: this set screw length l; The center distance of two-layer spiral coil is slightly long inside and outside the ratio; Reach c' is inner core load-bearing bar thickness and inner core depth of groove sum; Screwhole diameter on major diameter of thread r and the load-bearing bar is complementary, and this major diameter of thread r is slightly less than screw diameter R, and the counterbore base diameter of screw diameter R and urceolus fixed strip is complementary; The form parameter of set screw countersunk head and urceolus fixed strip counterbore are complementary;
Inner sleeve 1: the wall thickness b of this inner sleeve calculates according to pressure-bearing and confirms that outside diameter d is slightly less than the internal diameter of innermost layer spiral coil, and the inner sleeve outer wall circumferentially is uniformly distributed with many axial notch 1-1, is used for mounting inner cylinder load-bearing bar 2; The thickness t and the width w of the degree of depth t of groove and width w and inner core load-bearing bar 2 are complementary, and make inner core load-bearing bar 2 to embed fully in the groove; The height of inner sleeve is H, equates with the height of spiral coil;
Outer sleeve 7: the inside diameter D of this outer sleeve 7 is slightly larger than the external diameter of outermost surface spiral coil, and wall thickness b' calculates according to pressure-bearing and confirms; The outer sleeve height H is highly identical with inner sleeve 1; The position of corresponding urceolus fixed strip 5 has groove 7-1, and the width w of groove is identical with the width of urceolus fixed strip 5, degree of depth t " equal the thickness of urceolus fixed strip 5;
Inner core load-bearing bar 2: be used for cooperating with inner sleeve 1, inner core load-bearing bar width w and thickness t confirm that according to stress analysis length L is identical with the inner sleeve height H; Evenly have screw 2-1 on the inner core load-bearing bar, screwhole diameter r equals the diameter of thread of set screw 7, the center distance of two pipes up and down in the spiral coil that adjacent screw center distance s is an innermost layer.
The present invention also proposes to adopt the assembling method of said modules to spiral coil, may further comprise the steps:
1) in each groove of inner sleeve, embeds an inner core load-bearing bar respectively;
2) adopt vertical or horizontal suit mode the ground floor spiral coil to be enclosed within the outside of the inner sleeve that installs inner sleeve load-bearing bar; Fixed strip is placed on this spiral coil outside and the corresponding place of inner sleeve load-bearing bar; Penetrate a hold-down screw in each counterbore on fixed strip respectively; Hold-down screw continues to pierce into the gap of neighbouring two spiral coils, and in the screw on the precession inner sleeve load-bearing bar;
3) through the precession set screw, the concentricity of adjustment first layer coil pipe and inner sleeve;
4) adjusted set screw and fixed strip spot welding are got up, screw rod and weld seam surperficial concordant with fixed strip extremely fixed strip outside exposed in polishing; Be stuck in the load-bearing bar of next helical layer coil pipe on this fixed strip again, fixed strip is embedded in the groove of load-bearing bar fully;
5) adopt and step 2) identical method, put the spiral coil of the second layer outside the load-bearing bar in step 4), outside this spiral coil, load onto another root fixed strip, and the precession set screw;
6) adopt the method identical, the concentricity of adjustment second layer coil pipe and first layer coil pipe and inner sleeve with step 3);
7) adopt the method identical, again fixed strip is embedded the groove of the load-bearing bar embedding of one deck down with step 4);
8) adopt and step 5) ~ 7) identical method, the suit of each helical layer coil pipe after accomplishing;
9) treat that the outermost surface spiral coil is accomplished fixedly suit after, be inserted in outer sleeve in the outermost surface spiral coil outside again, and the urceolus fixed strip that has been contained in the outermost surface spiral coil outside be inserted in the groove on the outer sleeve, the suit of completion outer sleeve 7.
Characteristics of the present invention and beneficial effect:
1. use fixed block closely to fix spiral coil, reduced producing the risk that stream causes vibration.
2. under closely fixing situation, the accuracy of manufacturing of spiral coil and fixing-assembly is not done too high requirement, the realization of assembly precision and tightness degree does not rely on the accuracy of manufacturing of component.
3. under closely fixing situation, retrain the thermal expansion of spiral coil on the one hand, prevent that the connection part of coil pipe and miscellaneous part is stressed along short transverse; Do not limit spiral coil thermal expansion radially on the other hand, the thermal stress that receives with lax coil pipe.
4. can be used for assembling the spiral coil that possesses about multi-layer structure; Integrity, intensity and the precision of assembling is all very desirable; Be particularly suitable in the equipment such as high temperature nuclear reactor steam generator, industrial boiler and preheating recovering device, and other need use the occasion of large-sized multiple layer spiral coil.
5. the implementation process of assembling is simple, is convenient to operation.
Description of drawings
Fig. 1 is the schematic representation of individual layer spiral coil;
Fig. 2 is the schematic representation of multi-layer helical coil pipe;
Fig. 3 is the structural representation of fixing-assembly-inner core of the present invention, urceolus, screw;
Fig. 4 is the structural representation of fixing-assembly of the present invention-load-bearing bar, fixed strip;
Fig. 5 is the suit step schematic representation that adopts fixing-assembly of the present invention;
Fig. 6 is the horizontal suit schematic representation of spiral coil;
Fig. 7 is the vertical suit schematic representation of spiral coil;
Fig. 8 is the point of contact schematic representation of fixing-assembly and coil pipe;
Fig. 9 is the plan view after spiral coil is accomplished suit.
Wherein:
1: inner sleeve 2: inner core load-bearing bar 3: load-bearing bar 4: fixed strip
5: urceolus fixed strip 6: screw 7: outer sleeve 8: individual layer single head spiral coil
9: individual layer multi-head spiral coil pipe 10: multilayer single head spiral coil 11: multilayer multi-head spiral coil pipe
12: overhang 13: boom hoisting
Embodiment
A kind of spiral coil fixing-assembly provided by the invention and assembling method specify as follows in conjunction with accompanying drawing and embodiment:
Spiral coil fixing-assembly of the present invention is like Fig. 3, shown in 4, and this assembly mainly is made up of inner sleeve 1, inner core load-bearing bar 2, load-bearing bar 3, fixed strip 5, set screw 6 and 7 of outer sleeves, and the embodiment of each parts and function are explained respectively as follows:
Set screw 6: shown in Fig. 3 (a); Set screw 6 length l; Slightly long (the for example long 3-6 millimeter of the center distance of two-layer spiral coil inside and outside the ratio; Be used to finely tune concentricity), reach c' is inner core load-bearing bar thickness and inner core depth of groove sum, the screwhole diameter on major diameter of thread r and the load-bearing bar is complementary; This major diameter of thread r is slightly less than screw diameter R (making screw when passing the coil pipe gap, be unlikely to scratch coil pipe gets final product), and the counterbore base diameter of screw diameter R and urceolus fixed strip is complementary.The form parameter of set screw countersunk head and urceolus fixed strip counterbore are complementary.
Set screw of the present invention can adopt the fine thread screw.
Inner sleeve 1: shown in Fig. 3 (b); Inner sleeve 1 adopts the seamless steel pipe manufacturing; The wall thickness b of this inner sleeve calculates according to pressure-bearing and confirms that guaranteeing has enough safety allowances, and outside diameter d is slightly less than the internal diameter (making the innermost layer coil pipe to put inner sleeve smoothly gets final product) of innermost layer spiral coil; The inner sleeve outer wall circumferentially is uniformly distributed with many axial notch 1-1 (giving an example for being uniformly distributed with 3 grooves conducts shown in the figure), is used for mounting inner cylinder load-bearing bar 2; The thickness t and the width w of the degree of depth t of groove and width w and inner core load-bearing bar 2 are complementary, and make inner core load-bearing bar 2 to embed fully in the groove.The height of inner sleeve is H, equates (or slightly exceeding some as allowance) with the height of spiral coil.
Outer sleeve 7: shown in Fig. 3 (c); The employing seamless steel pipe is made, and the inside diameter D of outer sleeve 7 is a bit larger tham the external diameter (making outer sleeve can just put the outermost surface spiral coil smoothly gets final product) of outermost surface spiral coil, and wall thickness is b'; Calculating confirms that guaranteeing has enough safety allowances according to pressure-bearing; The outer sleeve height H is highly identical with inner sleeve 1.The position of corresponding urceolus fixed strip 5 has groove 7-1, and the width w of groove is identical with the width of urceolus fixed strip 5, degree of depth t " equal the thickness of urceolus fixed strip 5.
Inner core load-bearing bar 2: shown in Fig. 4 (a), be used for cooperating with inner sleeve 1, adopt bar or sheet material to carry out machining and process, width w and thickness t confirm that according to stress analysis guaranteeing has enough safety allowances, and length L is identical with the inner sleeve height H; Evenly have screw 2-1 on the inner core load-bearing bar, screwhole diameter r equals the diameter of thread of set screw 7, the center distance of two pipes up and down in the spiral coil that adjacent screw center distance s is an innermost layer.
Load-bearing bar 3: shown in Fig. 4 (b), adopt bar or sheet material to carry out machining and process, the width w' of load-bearing bar 3 is about the inner core load-bearing bar 2 width w of twice; Thickness t ' than inside and outside gap smaller (gap that makes load-bearing bar 3 can only put two-layer spiral coil just into gets final product) between the two-layer spiral coil outer wall, be about the twice of inner core load-bearing bar thickness t; Length L is identical with the height H of inner sleeve 1.Evenly have screw 3-1 on the load-bearing bar, the quantity of screw, shape and position feature are identical with screw on the inner core load-bearing bar 2.The one side centre of load-bearing bar has groove 3-2, and groove 3-2 width w is identical with the width w and the thickness T of fixed strip 4 with degree of depth T.
Fixed strip 4: shown in Fig. 4 (c), adopt bar or sheet material to carry out machining and process the length L of fixed strip 4; Thickness T, width w, and screw centre distance s all with load-bearing bar 3 on groove be complementary; Confirm that according to stress analysis guaranteeing has enough safety allowances.Evenly have the counterbore 4-1 that is used for the countersunk head set screw on the fixed strip.The similar funnel of counterbore shape, base diameter R with want in the spiral coil of fixed bed, two spacings of managing between the outer wall are identical up and down; Counterbore height c is about the half the of base diameter R; Counterbore is miter angle from the bottom and extends out to the top, and top diameter is R', is confirmed by R and c.
Urceolus fixed strip 5: shown in Fig. 4 (d); Be used for cooperating, adopt bar or sheet material to carry out machining and process the length L of urceolus fixed strip 5 with outer sleeve 7; Width w; Screw centre distance s, and counterbore shape parameters R, R', c are all identical with fixed strip 4, thickness t " can be greater than the thickness 2-4 millimeter of fixed strip 4.
Above-mentioned each parts of the present invention all customize according to the size of the concrete spiral coil of wanting suit, and the size of each assembly cooperatively interacts.
Set screw, fixed strip and cooperate the load-bearing bar with spiral coil with sleeve, coil pipe clamps, and as can be seen from Figure 8, coil pipe and fixed strip 4 have two point of contact 9-1 and load-bearing bar 3 that two point of contact 9-2 are also arranged.These point of contact need bear bigger load, if the material selection of fixed strip and load-bearing bar is improper, then are prone to the accident that causes spiral coil to be scratched.So the Brinell hardness of the material that fixed strip of the present invention and load-bearing bar parts adopt is lower than the Brinell hardness of the material of the spiral coil employing of the suit of wanting, the difference of both Brinell hardness is more than 50HB.Like this, when fixed strip and load-bearing bar and coil pipe mutually when mutual friction or extruding, damaged will be fixed strip and load-bearing bar, rather than coil pipe.In addition, four point of contact of fixed strip and load-bearing bar and coil pipe all can be processed into fillet to reduce footprint pressure.
The present invention adopts the assembling method of said modules to spiral coil, may further comprise the steps:
1) shown in Fig. 5-A; (the inner core load-bearing bar 2 that embeds inner sleeve 1 groove is reserved certain finish allowance earlier in each groove 1-1 of inner sleeve 1, to embed an inner core load-bearing bar 2 respectively; Run in the time of widely can't embed during 2 assemblings of inner core load-bearing bar, carry out detail sanding again and put in place).
2) shown in Fig. 5-B; The outside of adopting vertical or horizontal suit mode that ground floor (innermost layer) spiral coil 11 is enclosed within the inner sleeve 1 that installs inner sleeve load-bearing bar 2; Fixed strip 4 is placed on the corresponding place of spiral coil 11 outsides and inner sleeve load-bearing bar 2; Penetrate a hold-down screw 6 respectively in each counterbore 4-1 (Fig. 4) on fixed strip 4; Hold-down screw 6 continues to pierce into the gap of neighbouring two spiral coils, and among the screw 2-1 on the precession inner sleeve load-bearing bar 2, (wouldn't tighten hold-down screw); And make the spiral coil behind the suit be positioned at upright state.
This step can be carried out different disposal according to the situation of actual spiral coil; When spiral coil height and weight hour; Can adopt the mode of horizontal suit shown in Figure 6 to assemble; Be about to spiral coil 11 and the inner sleeve 1 all horizontally-arranged (will avoid the position of load-bearing bar is pressed on the ground) that installs inner sleeve load-bearing bar 2; Adopt an overhang 12 to stretch in the inner sleeve 1, again with its gently level insert in the spiral coil 11.After this place fixed strip 4 in the spiral coil outside with inner sleeve load-bearing bar 2 corresponding places again; Set screw 6 is passed the counterbore 4-1 on the fixed strip 4; Through the space between neighbouring two pipes in the spiral coil 11; And among the screw 2-1 on the precession inner sleeve load-bearing bar 2 (fixed strip, set screw are not shown in Fig. 7), the first layer spiral coil that at last cover is installed is erect.
Higher when spiral coil, (because overhang has only an end that supporting is arranged, counterweight that need be very big could the maintenance level to adopt vertical suit when deadweight is big.When spiral coil is upright,, can cause up and down the unequal problem in gap between two coil pipes because self weight is bigger.) adopt vertical suit scheme as shown in Figure 7 to assemble.Assemble sequence is following:
2-a) shown in Fig. 7-A, use boom hoisting 13 spiral coil 11 of vertically slinging, spiral coil 11 outside being enclosed within the perpendicular inner sleeve of putting 1, wouldn't be withdrawn boom hoisting 13.
2-b) shown in Fig. 7-B; Continue to use 13 pairs of spiral coils 11 of boom hoisting suitably to apply lifting force upwards; Utilize lifting force to offset the gravity of self, make the bottom of spiral coil 11 that enough gaps (lifting force make just coil pipe several gaps down corresponding with the counterbore position on the fixed strip) arranged, again outside spiral coil behind the placement fixed strip 4; (quantity according to the total coil pipe gap of spiral coil is decided from spiral coil adjacent several coil pipe gaps that below makes progress successively; Be generally 1/40th to 1/10th of total number of gaps, after being raised with spiral coil, can just insert screw between two spiral coils up and down and be as the criterion) insert a set screw 6; This set screw passes counterbore 4-1 and the gap of coil pipe on the fixed strip 4 successively, among the screw 2-1 on the load-bearing bar 2 of last precession relevant position.
2-c) shown in Fig. 7-C; Boom hoisting 13 reduces lifting force a little; Put down spiral coil slightly (make the coil pipe gap of equal number of the coil pipe gap top of inserting set screw corresponding) with the counterbore position on the fixed strip; In the coil pipe gap of the equal number of the coil pipe gap top of inserting set screw, insert set screw again, make it pass counterbore and the gap of coil pipe on the fixed strip successively, among the screw 2-1 on the load-bearing bar 2 of last precession relevant position.
2-d) shown in Fig. 7-D, repeating step 2-c) identical operations, all the counterbore 4-1 on fixed strip, and all gaps between two coil pipes up and down of spiral coil till the screw 6 that all is fixed is filled, withdraw boom hoisting again.
3) shown in Fig. 5-C, through precession set screw 6, the concentricity of adjustment first layer coil pipe 11 and inner sleeve 1; Concrete grammar is following:
All set screws 6 of precession at first, make inner sleeve load-bearing bar 2 ejected inner sleeve groove 1-1 and with the interior side contacts of spiral coil 11;
All set screws on the same level height of inching make these set screws under the situation of tightening again, and the spiro rod length that exposes outside fixed strip equates, adopts identical all set screws on same level height of method adjustment.After accomplishing adjustment, the axle center of the axle center of inner sleeve 1 and first layer coil pipe is thought and is overlapped.
4) shown in Fig. 5-C, adjusted set screw 6 and fixed strip 4 spot welding to be got up, screw rod and weld seam surperficial concordant with fixed strip 4 extremely fixed strip outside exposed in polishing; Be stuck in the load-bearing bar 3 of next helical layer coil pipe on this fixed strip 4 again, fixed strip 4 is embedded among the groove 3-2 of load-bearing bar 3 fully.
5) shown in Fig. 5-d, use and step 2) identical method, outside load-bearing bar 3, put the spiral coil of the second layer, load onto another root fixed strip 4 in the spiral coil outside, and precession set screw 6.
6) shown in Fig. 5-e, use the method identical, the concentricity of adjustment second layer coil pipe and first layer coil pipe and inner sleeve with step 3).
7) use the method identical, again fixed strip is embedded the groove of the load-bearing bar embedding of one deck down with step 4).
8) use the method identical, the suit of each helical layer coil pipe after accomplishing with step 5 ~ 7.
9) treat that the outermost surface spiral coil is accomplished fixedly suit after, be inserted in outer sleeve in the outermost surface spiral coil outside again, and the urceolus fixed strip 5 that has been contained in the outermost surface spiral coil outside be inserted among the groove 7-1 on the outer sleeve 7, the suit of completion outer sleeve 7.
The final spiral coil of accomplishing suit, its plan view (being example only) as shown in Figure 9 with the double-layer spiral coil pipe.Wherein A is the local enlarged diagram in fixing-assembly place, and B-B is a fixing-assembly place generalized section.
Solve the fixation problem of large scale multilayer multi-head spiral coil pipe:
Present embodiment need be accomplished the suit to a helical disk tubular type heat exchanger, and this heat exchanger is made up of 35 heat-transfer pipes, and single heat-transfer pipe length is 60m, and external diameter and wall thickness are respectively 19mm and 3mm, and the heat-transfer pipe material is P91.These heat-transfer pipes are bent into spiral coil, adopt bull multiple layer spiral coil layout, are divided into 5 layers, and every layer of coil pipe head number is respectively 5,6,7,8,9 from inside to outside.Each layer coil pipe central diameter is respectively 350mm/420mm/490mm/560mm/630mm, and the gap between every layer of coil pipe is 16mm, and the gap between two coil pipes is 6m up and down, and the coil pipe height is about 6750mm; Overall diameter is 666mm.The Brinell hardness of coil pipe material P91 is 250HB; The material of fixing-assembly is Inconel 800 (hardness is below the 140HB) or Inconel617 (hardness is below 190HB).These coil pipes fixedly assemble up and have just formed heat exchanger, and this heat exchanger is estimated the temperature range work at 400 ℃ to 600 ℃, the about 12MPa of tube wall pressure-bearing.
The concrete size and the quantity of each parts of present embodiment fixing-assembly are:
1 of inner sleeve: high 6750mm, external diameter 329mm, wall thickness 15mm has three grooves, the wide 16mm of groove, dark 8mm.
3 of inner core load-bearing bars: long 6750mm, wide 16mm, thick 8mm, the screw specification is the M5 closely-pitched, pitch 0.5mm.
12 of load-bearing bars: long 6750mm, wide 30mm, thick 15mm, the wide 16mm of groove, dark 8mm, the screw specification is the M5 closely-pitched, pitch 0.5mm.
12 of fixed strips: long 6750mm, wide 16mm, thick 8mm, the path 6mm of counterbore, big footpath 12mm, the countersunk head degree of depth partly is 3mm.
3 of urceolus fixed strips: long 6750mm, wide 16mm, thick 10mm, the path 6mm of counterbore, big footpath 12mm, the countersunk head degree of depth partly is 3mm.
1 of outer sleeve: high 6750mm, internal diameter 651mm, wall thickness 15mm has three grooves, the wide 16mm of groove, dark 10mm.
5000 on screw (4050 of actual demand are reserved reserve level): the screw thread specification is M5, and screw thread is distributed in the preceding 16mm of tip of screw; Screw diameter 6mm; Countersunk head height 3mm has cruciate flower or interior hexagonal, and head has the groove of high about 1mm along hoop; Be used to install spot welding, screw length is 40mm.
Use the said fixing assembly that above-mentioned spiral coil is carried out the method for suit, may further comprise the steps:
1) three inner core load-bearing bars is embedded respectively in three grooves on the inner sleeve.
2) adopt the mode of vertical suit to put the first layer spiral coil.The external diameter of inner sleeve is 329mm, and the internal diameter of first layer spiral coil is 350-19=331mm, so the suit allowance (spiral coil bend precision can suitably relax) of 1mm is arranged on the radius.The suit step is following:
2-a) use the boom hoisting spiral coil of vertically slinging, spiral coil outside the top is enclosed within the perpendicular inner sleeve of putting, wouldn't be withdrawn boom hoisting;
2-b) continue to use boom hoisting that spiral coil is suitably applied lifting force upwards; Utilize lifting force to offset the gravity of self; Make the bottom of spiral coil that enough gaps arranged, again in the spiral coil outside, behind three fixed strips of three corresponding positions placements of inner core load-bearing bar; To spiral coil in the gap of 10 adjacent coil pipes making progress successively of below; Insert set screw, these screws pass counterbore and coil pipe gap corresponding on the fixed strip successively, screw at last in the screw corresponding on the inner core load-bearing bar;
2-c) boom hoisting reduces lifting force a little; Put down spiral coil slightly;, fixed strip inserts set screw in having inserted 10 adjacent coil pipe gaps of top in coil pipe gap of set screw again; These screws pass counterbore and coil pipe gap corresponding on the fixed strip successively, screw at last in the screw corresponding on the inner core load-bearing bar;
2-d) repeating step 2-c) identical operations, all counterbores on three fixed strips, and all gaps between two coil pipes up and down of spiral coil, the screw that all is fixed is withdrawn boom hoisting till filling again.
3) through the precession set screw, the concentricity of adjustment first layer coil pipe and inner sleeve.Screw length is 40mm, and than the long 5mm of center distance of inside and outside two-layer spiral coil, this 5mm is exactly the scope of adjustment, and concrete grammar is following:
All set screws of precession at first, make inner sleeve load-bearing bar ejected inner sleeve groove and with the interior side contacts of spiral coil; Three set screws on the same level height of inching make these three set screws under the situation of tightening again, and the spiro rod length that exposes outside fixed strip equates, adopts identical all three set screws on same level height of method adjustment.After accomplishing adjustment, the axle center of the axle center of inner sleeve and first layer coil pipe is thought and is overlapped.
4) adjusted set screw and fixed strip spot welding are got up, screw rod and weld seam surperficial concordant with fixed strip extremely fixed strip outside exposed in polishing; Be stuck in the load-bearing bar of next helical layer coil pipe on this fixed strip again, fixed strip is embedded in the groove of load-bearing bar fully.
5) adopt and step 2) identical method, outside the load-bearing bar, put the spiral coil of the second layer, outside spiral coil, load onto another root fixed strip, and the precession set screw.
6) adopt the method identical, the concentricity of adjustment second layer coil pipe and first layer coil pipe and inner sleeve with step 3).
7) adopt the method identical, again fixed strip is embedded the groove of the load-bearing bar embedding of one deck down with step 4).
8) adopt and above-mentioned steps 5)～7) identical method, the suit of each helical layer coil pipe after accomplishing.
9) treat that the outermost surface spiral coil is accomplished fixedly suit after, be inserted in outer sleeve in the outermost surface spiral coil outside again, the urceolus fixed strip is inserted, the suit of completion outer sleeve along the groove on the outer sleeve.
Solve the fixation problem of small-medium size individual layer twin-feed spiral coil pipe:
Present embodiment need be accomplished the suit to a compact spiral coil exchanger, and this heat exchanger is made up of two heat-transfer pipes, and single heat-transfer pipe length is 40m, and external diameter and wall thickness are respectively 22mm and 4mm, and the heat-transfer pipe material is SA213T23, and hardness is about 190HB.Two heat-transfer pipes of this heat exchanger adopt individual layer twin-feed spiral coil pipe layout; Two common spirals of heat-transfer pipe rise, and screw diameter (directly calculating by the heat-transfer pipe center) is 450mm, and the coil pipe internal diameter is 428mm; The coil pipe external diameter is 472mm, and two neighbouring coil pipes are spaced apart 8mm.Coil pipe whole height calculated value is about 1700mm, put outer sleeve after external diameter be about 490mm.
The material that the present embodiment fixing-assembly is selected for use is SA210 (hardness is below 143HB), and the concrete size and the quantity of each parts are following:
1 of inner sleeve: high 1700mm, external diameter 426mm, wall thickness 16mm has three grooves, the wide 16mm of groove, dark 8mm.
3 of inner core load-bearing bars: long 1700mm, wide 24mm, thick 8mm, the screw specification is Φ 7 closely-pitcheds, pitch 0.75mm.
3 of urceolus fixed strips: long 1700mm, wide 24mm, thick 10mm, the path 8mm of counterbore, big footpath 16mm, the countersunk head degree of depth partly is 4mm.
1 of outer sleeve: high 1700mm, internal diameter 474mm, wall thickness 16mm has three grooves, the wide 24mm of groove, dark 10mm.
180 on screw: the screw thread specification is Φ 7 closely-pitcheds, and pitch 0.75mm only has screw thread in the 16mm before tip of screw; Screw diameter 8mm, countersunk head height 4mm has cruciate flower or interior hexagonal; Head has the groove of high about 1mm along hoop, is used to install spot welding, and screw length is 45mm.
Use the said fixing assembly that above-mentioned spiral coil is carried out the method for suit, may further comprise the steps
1) three inner core load-bearing bars is embedded the groove on the inner sleeve.
2) adopt the mode of horizontal suit to put spiral coil.The external diameter of inner sleeve is 426mm, and the internal diameter of first layer spiral coil is 428mm, so the suit allowance of 1mm is arranged on the radius.
With spiral coil and the inner sleeve all horizontally-arranged (will avoid the position of load-bearing bar is pressed on the ground) that has installed inner sleeve load-bearing bar, adopt an overhang to stretch in the inner sleeve, again with it gently in the level insertion spiral coil.After this place fixed strip in the place corresponding, the spiral coil outside again with inner sleeve load-bearing bar; Set screw is passed the counterbore on the fixed strip; And through the gap between neighbouring two coil pipes in the spiral coil; In the screw on the precession inner sleeve load-bearing bar, treat that all counterbores on the urceolus fixed strip all insert set screw after, the spiral coil that cover installs is erect.
3) through the precession set screw, the concentricity of adjustment spiral coil and inner sleeve.Screw length is 45mm, and than distance (8mm+1mm+22mm+10mm=41mm) the long 4mm of urceolus fixed strip outer surface to the inner sleeve bottom portion of groove, this 4mm is exactly the scope of adjustment, and concrete grammar is following:
All set screws of precession at first, make inner sleeve load-bearing bar ejected inner sleeve groove and with the interior side contacts of spiral coil; Three set screws on the same level height of inching make these three set screws under the situation of tightening again, and the spiro rod length that exposes outside fixed strip equates, adopts identical all three set screws on same level height of method adjustment.After accomplishing adjustment, the axle center of inner sleeve and the axle center of spiral coil are thought and are overlapped.
4) adjusted set screw and fixed strip spot welding are got up, screw rod and weld seam surperficial concordant with fixed strip extremely fixed strip outside exposed in polishing
The mode of horizontal suit 5) the similar step 2 of employing) is inserted in the spiral coil that fixes in the outer sleeve.
Claims (7)
1. a spiral coil fixing-assembly is characterized in that, this assembly mainly is made up of inner sleeve, inner core load-bearing bar, load-bearing bar, fixed strip, set screw and outer sleeve, and the concrete structure of each parts is following:
Set screw (6): this set screw length (l); The center distance of two-layer spiral coil is slightly long inside and outside the ratio; Reach (c') is inner core load-bearing bar thickness and inner core depth of groove sum; Screwhole diameter on major diameter of thread (r) and the load-bearing bar is complementary, and this major diameter of thread (r) is slightly less than screw diameter (R), and screw diameter (R) is complementary with the counterbore base diameter of fixed strip; The form parameter of set screw countersunk head and fixed strip counterbore are complementary;
Inner sleeve (1): the wall thickness of this inner sleeve (b) calculates according to pressure-bearing confirms that external diameter (d) is slightly less than the internal diameter of innermost layer spiral coil, and the inner sleeve outer wall circumferentially is uniformly distributed with many axial notches (1-1), is used for mounting inner cylinder load-bearing bar (2); The degree of depth of groove (t) and width (w) are complementary with the thickness (t) and the width (w) of inner core load-bearing bar (2), make inner core load-bearing bar (2) to embed fully in the groove; The height of inner sleeve is (H), equates with the height of spiral coil;
Outer sleeve (7): the internal diameter (D) of this outer sleeve (7) is slightly larger than the external diameter of outermost surface spiral coil, and wall thickness (b') calculates according to pressure-bearing to be confirmed; Outer sleeve height (H) is highly identical with inner sleeve (1); The position of corresponding urceolus fixed strip (5) has groove (7-1), and the width of groove (w) is identical with the width of urceolus fixed strip (5), and the degree of depth (t ") equals the thickness of urceolus fixed strip (5);
Inner core load-bearing bar (2): be used for cooperating with inner sleeve (1), inner core load-bearing bar width (w) and thickness (t) confirm that according to stress analysis length (L) is identical with inner sleeve height (H); Evenly have screw (2-1) on the inner core load-bearing bar, screwhole diameter (r) equals the diameter of thread of set screw (7), and adjacent screw center distance (s) is the center distance of two pipes up and down in the spiral coil of innermost layer;
Load-bearing bar (3): the width (w') of this load-bearing bar (3) is about inner core load-bearing bar (2) width (w) of twice; Gap inside and outside thickness (t') ratio between the two-layer spiral coil outer wall is smaller, is about the twice of inner core load-bearing bar thickness (t); Length (L) is identical with the height (H) of inner sleeve (1); Evenly have screw (3-1) on the load-bearing bar, the quantity of screw, shape and position feature are identical with screw on the inner core load-bearing bar 2.The one side centre of load-bearing bar has groove (3-2), and groove (3-2) width (w) is identical with the width (w) and the thickness (T) of fixed strip (4) with the degree of depth (T);
Fixed strip (4): the length (L) of this fixed strip (4), thickness (T), width (w), and screw centre distance (s) all with load-bearing bar (3) on groove be complementary; Evenly have the counterbore (4-1) that is used for the countersunk head set screw on the fixed strip;
Urceolus fixed strip (5): the length (L) of this urceolus fixed strip (5); Width (w); Screw centre distance (s), and counterbore shape parameter (R), (R'), (c) are all identical with fixed strip (4), thickness (t ") is greater than the thickness 2-4 millimeter of fixed strip (4).
2. assembly according to claim 1 is characterized in that, the Brinell hardness of the material that said fixed strip and load-bearing bar parts adopt is lower than more than the Brinell hardness 50HB of material of spiral coil employing of the suit of wanting.
3. assembly according to claim 1 is characterized in that, said set screw adopts the fine thread screw.
4. one kind is adopted according to claim 1 that assembly may further comprise the steps the assembling method of spiral coil:
1) in each groove of inner sleeve, embeds an inner core load-bearing bar respectively;
2) adopt vertical or horizontal suit mode the ground floor spiral coil to be enclosed within the outside of the inner sleeve that installs inner sleeve load-bearing bar; Fixed strip is placed on this spiral coil outside and the corresponding place of inner sleeve load-bearing bar; Penetrate a hold-down screw in each counterbore on fixed strip respectively; Hold-down screw continues to pierce into the gap of neighbouring two spiral coils, and in the screw on the precession inner sleeve load-bearing bar;
3) through the precession set screw, the concentricity of adjustment first layer coil pipe and inner sleeve;
4) adjusted set screw and fixed strip spot welding are got up, screw rod and weld seam surperficial concordant with fixed strip extremely fixed strip outside exposed in polishing; Be stuck in the load-bearing bar of next helical layer coil pipe on this fixed strip again, fixed strip is embedded in the groove of load-bearing bar fully;
5) adopt and step 2) identical method, put the spiral coil of the second layer outside the load-bearing bar in step 4), outside this spiral coil, load onto another root fixed strip, and the precession set screw;
6) adopt the method identical, the concentricity of adjustment second layer coil pipe and first layer coil pipe and inner sleeve with step 3);
7) adopt the method identical, again fixed strip is embedded the groove of the load-bearing bar embedding of one deck down with step 4);
8) adopt and step 5) ~ 7) identical method, the suit of each helical layer coil pipe after accomplishing;
9) treat that the outermost surface spiral coil is accomplished fixedly suit after, be inserted in outer sleeve in the outermost surface spiral coil outside again, and the urceolus fixed strip that has been contained in the outermost surface spiral coil outside be inserted in the groove on the outer sleeve, the suit of completion outer sleeve 7.
5. like the said method of claim 4; It is characterized in that; Said step 2) mode of horizontal suit adopts an overhang to stretch in the inner sleeve for spiral coil is all horizontally-arranged with the inner sleeve 1 that installs inner sleeve load-bearing bar in, its level is inserted in the spiral coil again; Place fixed strip in the place corresponding, the spiral coil outside again, set screw is passed the counterbore on the fixed strip with inner sleeve load-bearing bar, through the space between neighbouring two pipes in the spiral coil, and in the screw on the precession inner sleeve load-bearing bar; The first layer spiral coil that at last cover is installed is erect.
6. like the said method of claim 4, it is characterized in that said step 2) adopt vertical suit mode specifically to may further comprise the steps:
2-a) use the boom hoisting spiral coil of vertically slinging, with spiral coil outside being enclosed within the perpendicular inner sleeve of putting;
2-b) continue to use boom hoisting that spiral coil is applied lifting force upwards; Again after fixed strip 4 is placed in the spiral coil outside; From spiral coil adjacent several coil pipe gaps that below makes progress successively, insert a set screw; This set screw passes counterbore and the gap of coil pipe on the fixed strip successively, in the screw on the load-bearing bar of last precession relevant position;
2-c) boom hoisting reduces lifting force; Insert set screw in the coil pipe gap of the equal number above the coil pipe gap of inserting set screw again; Make it pass counterbore and the gap of coil pipe on the fixed strip successively, in the screw on the load-bearing bar of last precession relevant position;
2-d) repeating step 2-c) identical operations, all counterbores on fixed strip, and all gaps between two coil pipes up and down of spiral coil, the screw that all is fixed is withdrawn boom hoisting till filling again.
7. like the said method of claim 4; It is characterized in that; The concentricity of said step 3) adjustment first layer coil pipe and inner sleeve is specially: all set screws of precession at first, make inner sleeve load-bearing bar ejected inner sleeve groove and with the interior side contacts of spiral coil;
All set screws on the same level height of inching make these set screws under the situation of tightening again, and the spiro rod length that exposes outside fixed strip equates, adopts identical all set screws on same level height of method adjustment; After accomplishing adjustment, the axle center of the axle center of inner sleeve and first layer coil pipe then overlaps.
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| CN103353102A (en) * | 2013-07-22 | 2013-10-16 | 清华大学 | Device capable of exchanging heat with high-temperature high-pressure gas |
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| CN106675590B (en) * | 2017-01-04 | 2019-07-30 | 中科合成油工程股份有限公司 | A kind of thermal cracker and its application method of Fischer-Tropsch synthesis petroleum tailings |
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| CN106542419B (en) * | 2017-01-13 | 2018-03-27 | 哈电集团（秦皇岛）重型装备有限公司 | Large scale bull flexible screw tube assembly equipment for supporting patient with burn and turn-over method |
| CN112770881A (en) * | 2018-09-28 | 2021-05-07 | 卓缤科技贸易公司 | Water jet coil to hose connector guide |
| CN110090938A (en) * | 2019-06-06 | 2019-08-06 | 遵义航天新力精密铸锻有限公司 | Coil pipe positioning tool |
| CN110763071A (en) * | 2019-10-31 | 2020-02-07 | 江苏永大化工机械有限公司 | Assembly process of heat exchange tube bundle |
| WO2023029800A1 (en) * | 2021-09-02 | 2023-03-09 | 宝银特种钢管有限公司 | Method for sleeving of multi-layer spiral tube bundle having profiled spatial bend |
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