CN206904444U

CN206904444U - A kind of elbow with self-balancing seal plug and the heating furnace with the elbow

Info

Publication number: CN206904444U
Application number: CN201720712256.4U
Authority: CN
Inventors: 陈孙艺
Original assignee: Maoming Gravity Petrochemical Equipment Co Ltd
Current assignee: Maoming Gravity Petrochemical Equipment Co Ltd; Challenge Petrochemical Machinery Corp
Priority date: 2017-06-19
Filing date: 2017-06-19
Publication date: 2018-01-19
Anticipated expiration: 2027-06-19

Abstract

A kind of elbow with self-balancing seal plug of the present utility model and the heating furnace with the elbow,Compared with prior art,Two plugs of the present utility model between the sealing fastening force of two circular cone through holes respectively to that can realize balance,The lever construction formed by equalizer bar and support component is realized,When one of plug is by elbow internal pressure or the percussion of fluid,The active force is acted directly on plug,Be one be unfavorable for sealing push power open,Passed to by plug on the stud mutually propped up therewith,Remake and use on equalizer bar,This is pushed power open and passed to by equalizer bar on another plug,Form the thrust to this plug,It is bigger to push power open,The thrust for being transmitted to another plug also increases,Form the homeostasis sealing mutually restricted,Therefore the sealed reliable performance of elbow can be effectively improved,Improve heat exchange efficiency,And the structure is integrally fairly simple,It is easily manufactured.

Description

A kind of elbow with self-balancing seal plug and the heating furnace with the elbow

Technical field

It the utility model is related to the design-and-build technical field in mechanical engineering equipment, and in particular to a kind of band self-balancing The elbow of seal plug and the heating furnace with the elbow, especially suitable for petroleum refining, petrochemical industry, coal chemical industry and other changes The tubular heater of work technical process fluid medium.

Background technology

(1) structure design and function of traditional heating stove

Heating furnace is the heart in chemical plant installations, and acting on for tubular heater is medium by pipe（Oil plant or gas） It is heated to the temperature needed for technique.

As shown in figure 1, being one of module of heating furnace, every heating furnace is formed by closed assembly above and below multiple modules, should Structure can realize fully balance and utilize various thermals source.The four sides of body of heater surrounds burner hearth by tall and big furnace wall 1, and furnace wall 1 is by work The profile steel frame such as word steel upper berth welding steel plate, distribution welding bar for line, is molded into heat-insulated and wear-resisting material between bar for line on steel plate Material.Support is installed on furnace wall to be used to support tube sheet 3 and 5, boiler tube 4 is through perforated pipe plate 3,5 so as to be lived by tube sheet support, stove Pipe 4 can be partly spiral fin coil or entirely spiral fin coil, boiler tube 4 pass through provided with outlet or entrance 2, the both ends of boiler tube 4 180 ° of return bend 6 connects, and what is flowed through in boiler tube 4 is the oil plant for needing to heat, and the outside of boiler tube 4 is in burner hearth vertically from lower past Upper (or level is from left to right, from right to left), what is flowed through was high-temperature flue gas or hot blast, and heat is transmitted to the oil plant in pipe by tube wall.

(2) building technology of traditional heating stove and its problem of exist

With the long-run development of social economy, energy demand increases sharply, and the crude oil in poor quality of exploitation is increasingly severe, refines oil work For skill technology to HTHP depth development, boiler tube inwall is easy to tie last layer similar to the hard thing of coke during use, influences boiler tube Heat transfer effect.There are two kinds for the treatment of methods to this, first, removal is burnt, second, putting in machine tool stove from the perforate on elbow Hard focus layer in pipe is removed, and casting elbow and its heating furnace with perforate design for this, certainly, pass through the perforate Quality testing can be carried out to boiler tube inwall using instrument, ensure the safe operation of heating furnace.

Traditional furnace pipe elbow is formed by steel tube bending, and it is relatively thin to limit the tube wall of the steel pipe because of technique, when needing to exist When perforate reassembles many obturators on elbow, then thin-wall bend meeting deformation of assembly welding causes intensity decreases, and seal line is narrow and shallow, Thick-wall elbow inconvenience is bent, and have to use cast form.Such casting elbow structure brings two subject matters：First, open The sealing in hole；Second, the loose not sherardizing steel of founding materials.Engineering circles once used such casting elbow, but elbow Each perforate respectively sets a set of special seal fitting to realize the sealing of each perforate respectively, and complicated, part is stupid Weight, easily leakage, it is often necessary to which unplanned shutdown is repaired, and running cost is high.

As can be seen here, existing plug elbow sealing is improved, simplifies structure, improves sealing reliability, heating can be improved Furnace thermal efficiency and economic benefit, there is very strong engineering and social and economic significance.

Utility model content

Above-mentioned technical problem be present for prior art, the utility model provides a kind of simple in construction, raising elbow sealing Reliability, improve the elbow and its heating furnace with self-balancing seal plug of heat exchange efficiency.

To achieve the above object, the utility model provides following technical scheme：

A kind of elbow with self-balancing seal plug is provided, includes the elbow body of U-shaped, the both sides of the elbow body Offer circular cone through hole, the two circular cone through holes be respectively provided with seal its respective side circular cone through hole it is conical Plug, the elbow body are provided with support component, equalizer bar and two studs, support component and are fixed in elbow body, balance The support component is articulated with the middle part of beam, two studs are separately mounted to the both ends of equalizer bar, between stud and equalizer bar Threaded connection, two studs are respectively held against the plug of respective side with so that the plug seals up the circular cone through hole of its respective side.

Wherein, the support component includes hole ear, fulcrum and pivot pin, and the hole ear is provided with a pair, and the device to hole ear is fixed on The top of elbow body, the fulcrum are articulated with two hole ears, the fulcrum, the fulcrum are articulated with the middle part of the equalizer bar Both ends offer mounting hole, the pivot pin is inserted in the mounting hole so as to spacing to fulcrum vertically.

Wherein, the cross section of the fulcrum is circle.

Wherein, the thermal coefficient of expansion of the plug is more than the thermal coefficient of expansion of the elbow body.

Wherein, the cross section of the equalizer bar is rectangle, and the equalizer bar is in longitudinal direction with centre for symmetrical centre symmetrical two Section bending is set.

Wherein, two of the circular cone through hole and the elbow body open-ended are alignd.

Wherein, the screw thread between the stud and the equalizer bar is the trapezoidal thread with auto-lock function.

Wherein, it is provided with equadag coating between the plug and the circular cone through hole.

Wherein, the plug is provided with the smooth pit in surface, and the pit is corresponding with the stud.

Wherein, the inner face for blocking the circular cone through hole of the plug is provided with hard, wear-resistant alloy-layer.

A kind of heating furnace for employing above-mentioned elbow, includes the module of several upper and lower closed assemblies, and each module includes stove The boiler tube that tube sheet that wall, the journal stirrup being arranged on the furnace wall, the journal stirrup support, the tube sheet support, the boiler tube Both ends connected by elbow.

The beneficial effects of the utility model：

A kind of elbow with self-balancing seal plug of the present utility model and the heating furnace with the elbow, with prior art Compare, two plugs of the present utility model to that can realize balance between the sealing fastening force of two circular cone through holes, pass through respectively The lever construction that equalizer bar and support component are formed is realized, when one of plug is by elbow internal pressure or the percussion of fluid When, the active force is acted directly on plug, be one be unfavorable for sealing push power open, pass to what is mutually propped up therewith by plug On stud, remake and use on equalizer bar, this is pushed power open and passed to by equalizer bar on another plug, is formed to this plug Thrust, pushes that power is bigger open, and the thrust for being transmitted to another plug also increases, and forms the homeostasis sealing mutually restricted, because This can effectively improve the sealed reliable performance of elbow, improve heat exchange efficiency, and the structure is integrally fairly simple, manufacturer Just.

Brief description of the drawings

Fig. 1 is the structural representation of a module of heating furnace.

Fig. 2 is a kind of structural representation of elbow with self-balancing seal plug in embodiment.

Fig. 3 is Fig. 2 top view.

Fig. 4 is the leverage schematic diagram after Fig. 2 structural simulations simplify.

Fig. 5 is the structural representation of the plug in embodiment.

Reference：

Furnace wall 1；

Boiler tube 2, the outlet of boiler tube or entrance 4；

Tube sheet 3,5；

Elbow 6, elbow body 7, plug 8, pit 81, wear-resistant alloy layer 82, stud 9, equalizer bar 10, hole ear 11, fulcrum 12nd, pivot pin 13；

Heated fluid enters elbow from the open arrow A on the left side, is then flowed out from the open arrow B on the right.

Embodiment

The utility model is described in detail below in conjunction with specific embodiment and accompanying drawing.

A kind of heating furnace with elbow of the present embodiment, elbow band self-balancing seal plug, as shown in figure 1, heating Stove includes the module of several upper and lower closed assemblies, and each module includes furnace wall 1, the journal stirrup being arranged on furnace wall 1, journal stirrup and supported Tube sheet 3 and 5, the boiler tube 2 that supports of tube sheet, the both ends of boiler tube 2 are connected by elbow 6.

As shown in Figures 2 and 3, elbow 6 includes the elbow body 7 of 180 ° of U-shaped, and the both sides of elbow body 7 open up There is a circular cone through hole, two of circular cone through hole and elbow body 7 open-ended to be alignd, and the two circular cone through holes are respectively provided with The conical plug 8 of the circular cone through hole of its respective side is sealed, because the profile of circular cone through hole overlaps with front cover in plug 8, because Do not have mark circular cone through hole in this figure, the conical sealing structure of plug 8 has a compensation function, after sealing face damage can be repaired It is continuing with.Elbow body 7 is provided with hole ear 11, pivot pin 13, fulcrum 12, equalizer bar 10 and two studs 9 that cross section is circle, Hole ear 11 is provided with a pair, and the device to hole ear 11 is fixed on the top of elbow body 7, and fulcrum 12 is articulated with two hole ears 11, equalizer bar 10 middle part is articulated with fulcrum 12, and the both ends of fulcrum 12 offer mounting hole, and pivot pin 13 is inserted in mounting hole so as to vertically Spacing to fulcrum 12, the mutually coordinated balance in left and right is very flexible, and pivot pin 13 is housed through the both ends of fulcrum 12 of hole ear 11, prevented The only play of fulcrum 12.The middle part of equalizer bar 10 is articulated with fulcrum 12, and two studs 9 are separately mounted to the both ends of equalizer bar 10, It is threadedly coupled between stud 9 and equalizer bar 10, two studs 9 are respectively held against the plug 8 of respective side with so that plug 8 seals up it The circular cone through hole of respective side.A pair of holes ear 11, hole ear 11 and the casting of elbow body 7 one are only set in one 180 ° of elbow body 7 Make and form.Two pairs of earholes need not be needed as tradition, a pair of holes ear 11 is with regard to that can seal two circular cone through holes.A pair of holes ear 11 Two pieces of ear tops between can join together, can not also be connected, it is true through stress analysis depending on internal pressure size suffered by elbow It is fixed.

Compared with prior art, two plugs 8 of the present utility model respectively to the sealing fastening forces of two circular cone through holes it Between can realize balance, as shown in Figures 2 and 3, the lever construction formed by equalizer bar 10 and fulcrum 12 is realized, when wherein one When individual plug 8 is by elbow internal pressure or the percussion of fluid, the active force is acted directly on plug 8, is one and is unfavorable for Power is pushed in sealing open, is passed to by plug 8 on the stud 9 mutually propped up therewith, is remake and use on equalizer bar 10, and this is pushed power open and led to Overbalance beam 10 is passed on another plug 8, forms the thrust to this plug 8, and it is bigger to push power open, is transmitted to another plug 8 thrust also increases, as shown in figure 4, equalizer bar 10 is lever, fulcrum 12 is the balance fulcrum of lever, the more big then F2 of F1 And then increase, but have F1=F2 and F=F1+F2 substantially, form the homeostasis sealing mutually restricted, therefore can effectively improve The sealed reliable performance of elbow, heat exchange efficiency is improved, and the structure is integrally fairly simple, it is easily manufactured.

In the present embodiment, the thermal coefficient of expansion of plug 8 is more than the thermal coefficient of expansion of elbow body 7, be the utility model from Another implication of balanced seal, its degrees of expansion is also greater than the bulging of the circular cone through hole of elbow body 7 after plug 8 is heated, rises Self-tightening acts on.Equadag coating is provided between plug 8 and circular cone through hole, equadag coating is fine and smooth uniformly, and it is cylindrical and curved to be coated in plug 8 Graphite on head circular cone through hole sealing surface is heated can expand at high temperature, it may have self-tightening acts on.

Wherein, the cross section of equalizer bar 10 is rectangle, and equalizer bar 10 is the symmetrical two sections of foldings of symmetrical centre with centre in longitudinal direction Curved setting, so as to form flexible equalizer bar 10, elastic buffer high temperature deformation, make up the influence of thermal expansion deformation.

In the present embodiment, the screw thread between stud 9 and equalizer bar 10 is the trapezoidal thread with auto-lock function, to prevent vibrated Shi Songdong.

In the present embodiment, as shown in figure 5, plug 8 is provided with the smooth pit 81 in surface, pit 81 is corresponding with stud 9, Both it can make to be accurately positioned rapidly between the lower end round end of stud 9 and plug 8, and can also reduce the friction between plug 8 and stud 9, Reach light fastening purpose.

In the present embodiment, the inner face for blocking circular cone through hole of plug 8 is provided with hard, wear-resistant alloy-layer 82.Antifriction alloy can Built-up welding is packed with, fluid-resistant impurity erosion.From the perspective of from the angle of professional technique, cast sturcture is very uneven, it is loose and inclined to exist The metallographic structure of analysis, welding performance is poor, and the cast sturcture that side is not welded crackle can be pulled out when welding meat cooling meat, so, do not have The inwall of elbow body 7 for having perforate seldom improves its sherardizing steel ability with the method for build-up wear-resistant layer, but perforate is curved The ability of its high sherardizing steel of method body of its inner face of plug 8 of the head independent built-up welding of can.The single end face of plug 8 is more curved The narrow space in head inner chamber is also convenient for overlay-operation, as long as plug 8 is preheating into temperature built-up welding again suitable enough, postweld heat preservation Stress is eliminated, prevents from the generation of crackle.If it find that overlay cladding has been worn in inspection, one layer of wearing layer of built-up welding again It can be continuing with.Or plug 8 can property forging material from other of not cast state.Therefore the structure can also extend The service life of elbow.In a word, new structure is simple and more reliable compared with the sealing of traditional structure, is more applicable for various heating The needs of stove.

In actual production manufacture, first, 180 ° of elbow bodies 7 of ear 11 with holes but not perforate are cast；

Secondly, to its inner chamber water-filling pressure testing after the arrangement surfaces externally and internally of elbow body 7, it is qualified to examine.

Again, elbow body 7 processes the hole opened on circular cone through hole and hole ear 11.

4th, process stud 9 and aequum.

5th, the inner face about 5mm of built-up welding plug 8, need plug 8 being preheating to temperature suitable enough, built-up welding before welding Insulation eliminates stress afterwards, carries out dyeing inspection to surfacing part, sees with the presence or absence of crackle or other defect.

6th, plug 8 is finished, the circular conical surface of its conical seal (contact) face and circular cone through hole in elbow body 7 is matched, passes through Red lead grinding judges its laminating degree up to more than 95%.

7th, assembling elbow is overall, then carries out an inner chamber water-filling pressure testing, the sealing property of plug 8 is examined, if any seepage It should repair, until qualified.

8th, when assembling heating furnace, strict comb mode welding boiler tube and elbow by design drawing requirement, the group Welded Joints should through inside ray detection, through dyeing inspection outer surface, confirm to be not present the defects of not allowing.

Finally, other mode of construction of heating furnace are identical with traditional handicraft.

Finally it should be noted that above example is only illustrating the technical solution of the utility model, rather than to this reality With the limitation of novel protected scope, although being explained with reference to preferred embodiment to the utility model, this area it is general It is logical it will be appreciated by the skilled person that can be modified to the technical solution of the utility model or equivalent substitution, without departing from this The spirit and scope of utility model technical scheme.

Claims

1. a kind of elbow with self-balancing seal plug, it is characterized in that：Elbow body including U-shaped, the two of the elbow body Sidepiece offers circular cone through hole, and the two circular cone through holes are respectively provided with the circular cone for the circular cone through hole for sealing its respective side The plug of shape, the elbow body are provided with support component, equalizer bar and two studs, support component and are fixed in elbow body, The support component is articulated with the middle part of equalizer bar, two studs are separately mounted to the both ends of equalizer bar, stud and equalizer bar Between be threadedly coupled, two studs are respectively held against the plug of respective side with so that the circular cone that the plug seals up its respective side leads to Hole.

2. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The support component includes Hole ear, fulcrum and pivot pin, the hole ear are provided with a pair, and the device to hole ear is fixed on the top of elbow body, and the fulcrum is articulated with Two hole ears, the fulcrum are articulated with the middle part of the equalizer bar, the both ends of the fulcrum offer mounting hole, the pivot pin It is inserted in the mounting hole so as to spacing to fulcrum vertically.

3. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The thermal expansion of the plug Coefficient is more than the thermal coefficient of expansion of the elbow body.

4. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The equalizer bar it is transversal Face is rectangle, and the equalizer bar is set in longitudinal direction with centre for the symmetrical two sections of bendings of symmetrical centre.

5. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The circular cone through hole and institute State two open-ended alignment of elbow body.

6. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The stud is put down with described Screw thread between weighing apparatus beam is the trapezoidal thread with auto-lock function.

7. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The plug and the circle Equadag coating is provided between taper via-hole.

8. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The plug is provided with table The smooth pit in face, the pit are corresponding with the stud.

9. a kind of elbow with self-balancing seal plug according to claim 1, it is characterized in that：The plug blocks institute The inner face for stating circular cone through hole is provided with hard, wear-resistant alloy-layer.

10. a kind of heating furnace, includes the module of several upper and lower closed assemblies, each module includes furnace wall, is arranged on the furnace wall On journal stirrup, the boiler tube that supports of the journal stirrup tube sheet, the tube sheet that support, the both ends of the boiler tube are connected by elbow It is logical, it is characterized in that：The elbow is the elbow described in any one of claim 1 to 9.