CN108644520A - A kind of straight pipe pressure-balancing type expansion joint of no balance wave - Google Patents
A kind of straight pipe pressure-balancing type expansion joint of no balance wave Download PDFInfo
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- CN108644520A CN108644520A CN201810325434.7A CN201810325434A CN108644520A CN 108644520 A CN108644520 A CN 108644520A CN 201810325434 A CN201810325434 A CN 201810325434A CN 108644520 A CN108644520 A CN 108644520A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of a bellows or an expansible folded or corrugated tube
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Abstract
A kind of straight pipe pressure-balancing type expansion joint of no balance wave, equipped with work bellows, it is connected separately with flange A and flange B at the axial both ends of work bellows, it is equipped at least one balance component between the flange A and flange B in the exterior circumferential direction of work bellows, the balance component is by pressure cylinder, piston and connecting rod composition are when the bellows that works stretches, piston is slidable in the axial direction with connecting rod, medium in all seal chambers is reduced with the sliding of piston, when the bellows that works compresses, piston is slidable in the axial direction with connecting rod, medium in all seal chambers increases with the sliding of piston, balance component is set to act on the power on piston with flange by equal with pressure thrust.The present invention can not only balance ripple pipe pressure thrust, but also can cancel balance wave, reduce expansion joint outer diameter and length, mitigate expansion joint weight, cost-effective.
Description
Technical field
The present invention relates to straight pipe pressure-balancing type expansion joints, particularly relate to a kind of straight-tube pressure-balance of no balance wave
Expansion joint.
Background technology
Existing straight pipe pressure-balancing type expansion joint conventional type is exceptionally pressed and two kinds of internal pressure.The straight tube pressure of external pressure pattern
Balanced expansion joint（Fig. 1）It is made of one group of work bellows and one group of balance bellows, is mainly used for absorbing axial displacement simultaneously
The pressure thrust of bellows can be balanced.The straight pipe pressure-balancing type expansion joint of internal pressure pattern（Fig. 2）By two work bellowss
With positioned at the structural members composition such as intermediate a balance bellows and pull rod, end plate, it is mainly used for absorbing axial direction and lateral displacement
And the pressure thrust of bellows can be balanced.
Conventional structure straight pipe pressure-balancing type expansion joint is to realize pressure balance, meets bit shift compensation needs except that need to be arranged
Outside operating wave, also need separately to set one group of balance wave for balancing pressure thrust, while increasing corresponding restraining structure part, manufacturing cost
It is relatively high.
For interior die mould straight pipe pressure-balancing type expansion joint, the outer diameter of balance wave is significantly larger than operating wave, thus makes
Excessive at expansion joint entire outer diameter, weight of equipment is heavier.In addition, because needing that balance wave is arranged, expansion joint entire length is by apparent
Increase.Therefore in the limited environment in space, whether such expansion joint arrangement is difficult.
Invention content
In order to solve the above technical problems, the present invention provides a kind of straight pipe pressure-balancing type expansion joint of no balance wave, not only
Ripple pipe pressure thrust can be balanced, and balance wave can be cancelled, reduces expansion joint outer diameter and length, mitigates expansion joint weight,
It is cost-effective.
To realize the above-mentioned technical purpose, used technical solution is：A kind of straight-tube pressure-balance of no balance wave is swollen
Swollen section is equipped with work bellows, flange A and flange B is connected separately at the axial both ends of work bellows, in work bellows
Exterior circumferential direction flange A and flange B between be equipped at least one balance component, the balance component by pressure cylinder,
Piston and connecting rod composition, pressure cylinder are fixed on flange A, are equipped at least by work bellows axial direction in pressure cylinder
One pressure chamber sets in each pressure chamber and matches there are one the cavity wall with pressure chamber and slide setting in pressure chamber
Piston, pressure chamber are divided into seal chamber and discharge chamber by piston, are equipped on the pressure cylinder of discharge chamber side and are connected with extraneous air
The axis of logical gas vent, connecting rod is parallel with the work axis of bellows, and the center of connecting rod is hollow-core construction, connecting rod
One end stretch in pressure chamber and be connected successively with all pistons, trepanning is equipped in the connecting rod of each seal chamber,
Trepanning makes the hollow-core construction of connecting rod be connected with the seal chamber, and the other end of connecting rod is connected with flange B, on flange B
Media communication hole equipped with connection work ripple tube cavity and connecting rod hollow-core construction, media communication hole, connecting rod hollow-core construction
It is sequentially communicated to form medium discharge or supplement channel with seal chamber, when the bellows that works stretches, piston is with connecting rod edge
Axial direction slides, and the medium in all seal chambers is reduced with the sliding of piston, when the bellows that works compresses, piston with
Connecting rod is slidable in the axial direction, and the medium in all seal chambers increases with the sliding of piston, and balance component is made to act on piston
On power with flange by equal with pressure thrust.
Multiple pressure cylinders are arranged in one annular and are fixed on flange A.
Multiple pressure cylinders are arranged on flange A independently of each other.
The section of media communication hole of the present invention is L-type.
Present invention has the advantages that：
1, the present invention can replace conventional straight pipe pressure-balancing type expansion joint balanced structure using balanced structure, be tied by the balance
Structure can cancel original multiple balance bellowss, and for original straight pipe pressure-balancing type expansion joint, ripple is balanced by removal
Expansion joint length and outer diameter can be greatly reduced in pipe, mitigate expansion joint weight, cost-effective.
2, according to conventional straight pipe pressure-balancing type expansion joint design feature, to realize pressure balance, it usually needs setting two
The identical work bellows of group diameter.The present invention can replace conventional straight pipe pressure-balancing type expansion joint balance knot using balanced structure
Structure, it is only necessary to which one group of work bellows, which is arranged, can meet bit shift compensation demand, can cancel one group of work bellows, for original
Expansion joint length and structural member quantity can be greatly reduced by reduction work bellows quantity in straight pipe pressure-balancing type expansion joint,
Mitigate expansion joint weight, it is cost-effective.
3, the present invention can replace conventional straight pipe pressure-balancing type expansion joint balanced structure using balanced structure, pass through the balance
Structure can cancel original multiple balance bellowss and one group of work bellows, and three groups of bellowss of original parallel connection are become one
Group work bellows, expansion joint rigidity at least reduce by 70%, substantially reduce under working condition to pipeline elastic reaction.
Description of the drawings
Fig. 1 is the structural schematic diagram of conventional external pressure straight pipe pressure-balancing type expansion joint；
Fig. 2 is the structural schematic diagram of conventional internal pressure straight pipe pressure-balancing type expansion joint；
Fig. 3 is the structural schematic diagram of the straight pipe pressure-balancing type expansion joint of the single pressure chamber of the present invention；
Fig. 4 is the structural schematic diagram of the single balance component of the single pressure chamber of the present invention；
Fig. 5 is the structural schematic diagram of connecting rod of the present invention；
Fig. 6 is the balance schematic diagram of the single pressure chamber of the present invention；
Fig. 7 is the structural schematic diagram of multiple balance components of the single pressure chamber of the present invention；
Fig. 8 is the structural schematic diagram of the straight pipe pressure-balancing type expansion joint of the more pressure chambers of the present invention；
Fig. 9 is the structural schematic diagram of the single balance component of the more pressure chambers of the present invention；
Figure 10 is the structural schematic diagram of the balance component for more pressure chambers that the present invention has conduction hole；
Figure 11 is the balance schematic diagram of the more pressure chambers of the present invention；
Figure 12 is another form structure schematic diagram of the straight pipe pressure-balancing type expansion joint of the more pressure chambers of the present invention；
In figure：1, flange A, 2, work bellows, 3, balance component, 3-1, pressure cylinder, 3-2, piston, 3-2-1, conduction hole, 3-
3, sealing ring A, 3-4, pressure chamber, 3-4-1, seal chamber, 3-4-2, discharge chamber, 3-5, connecting rod, 3-5-1, trepanning, 3-6 exhausts
Hole, 3-7, sealing ring B, 3-8, sealing ring C, 3-9, diaphragm plate, 3-10, sealing ring D, 3-11, conduction hole, 4, flange B, 4-1, Jie
Matter intercommunicating pore.
Specific implementation mode
The preferred embodiment for providing invention below in conjunction with the accompanying drawings, with the technical solution that the present invention will be described in detail.Here, it will give
Going out respective drawings, the present invention is described in detail.It should be strongly noted that preferred implementation example as described herein is only used
In the description and interpretation present invention, the present invention is not limited to or limited.
A kind of straight pipe pressure-balancing type expansion joint of no balance wave is equipped with work bellows 2, in the axis of work bellows 2
Be connected separately with flange A1 and flange B4 to both ends, work bellows 2 exterior circumferential direction flange A1 and flange B4 it
Between be equipped at least one balance component 3, when flange A 1 as medium entrance when, flange B 4 be used as media outlet, or work as flange A
When 1 conduct media outlet, flange B 4 is used as medium entrance, has no effect on the connection of balance component 3.Flange A 1 and flange B 4
It only limits and is used for stable equilibrium component 3 with the intermediate medium import and circumferencial direction being connected to work bellows 2
Outer edge, other components similar with flange arrangement belong to flange arrangement.Entire expansion joint is not limited to erect when in use
Straight use or horizontal use.
As shown in Fig. 2-Figure 12, balance component 3 is made of pressure cylinder 3-1, piston 3-2 and connecting rod 3-5, pressure cylinder 3-1
It is fixed on flange A1, flange A 1 makees medium inlet flange or media outlet flange, and bolt can be used and fix, weld
The fixed forms such as fixed are connect, pressure cylinder 3-1 is made to be moved with flange A 1, are set by 2 axial direction of work bellows in pressure cylinder 3-1
There is at least one pressure chamber 3-4, only there are one pistons when for single-chamber, and when for multi-cavity, there are one living in each pressure chamber
Plug, i.e., set that there are one match and slide in pressure chamber 3-4 with the cavity wall of pressure chamber 3-4 to set in each pressure chamber 3-4
Sealing can be added to reinforce sealing and not influencing the sliding of piston in the piston 3-2 set between piston 3-2 and pressure chamber 3-4
Circle, pressure chamber 3-4 are divided into seal chamber 3-4-1 and discharge chamber 3-4-2 by piston 3-2, the pressure cylinder 3- in the sides discharge chamber 3-4-2
1 equipped with making the gas vent 3-6 that extraneous air is connected with discharge chamber 3-4-2, seal chamber 3-4-1 flow into medium, and four sides is not leaked
Gas is not also open, and discharge chamber 3-4-2 makes piston when moving, not will produce the movement of drag effects piston.
The axis of connecting rod 3-5 is parallel with the work axis of bellows 2, i.e., with the compression or drawing of work bellows 2
It stretches and carries out in the axial direction, meanwhile, the moving direction of connecting rod 3-5 is parallel with the work axis direction of bellows 2, connection
The center of bar 3-5 is hollow-core construction, one end of connecting rod 3-5 stretch in pressure chamber 3-4 and successively with all piston 3-2 phases
Connection, is equipped with trepanning 3-5-1 on the connecting rod 3-5 of each seal chamber 3-4-1, and trepanning 3-5-1 makes the hollow knot of connecting rod 3-5
Structure is connected with seal chamber 3-4-1, and the other end of connecting rod 3-5 is connected with flange B4, and connection work is equipped on flange B4
Make the media communication hole 4-1 of 2 inner cavity of bellows and connecting rod 3-5 hollow-core constructions, media communication hole 4-1, the hollow knots of connecting rod 3-5
Structure and seal chamber 3-4-1 are sequentially communicated to form medium discharge or supplement channel, when the bellows 2 that works stretches, piston 3-2
Slidable in the axial direction with connecting rod 3-5, the medium in all seal chamber 3-4-1 is reduced with the sliding of piston 3-2, works as operating wave
When line pipe 2 compresses, piston 3-2 is slidable in the axial direction with connecting rod 3-5, and the medium in all seal chamber 3-4-1 is with work
The sliding for filling in 3-2 increases, and balance component is made to act on the power on piston with flange by equal with pressure thrust.
As pressure cylinder 3-1 shown in fig. 4, fig. 9, described is arranged and is fixed on flange A1, pressure cylinder one in one annular
It is body formed, that is, a balance component is only existed, the pressure chamber in the pressure cylinder of the balance component is annular, the piston to match
For annular, it is arranged with sealing ring A 3-3 and sealing ring B 3-4 between piston 3-2 and pressure cylinder 3-1, lives for sealing cooperation
Plug movement.
As shown in Fig. 7, Figure 12, multiple pressure cylinder 3-1 are arranged on flange A 1 independently of each other, such setting shape
Formula is separately formed by pressure cylinder, each is separately installed, and pressure chamber at this time is preferably cylindrical, meanwhile, with the pressure chamber phase
The section of matched piston 3-2 is also circle, and sealing ring A 3-3 are arranged on piston 3-2, for sealing cooperation piston fortune
It is dynamic.
The section of the media communication hole 4-1 is L-type.
As shown in Figure 10, the trepanning on connecting rod 3-5, which does not limit, is opened on connecting rod 3-5, can be opened on piston, leads to
The conduction hole for opening up on piston and being connected with seal chamber is crossed, by conduction hole by the hollow-core construction and seal chamber of connecting rod 3-5
3-4-1 is connected to.
To realize pressure balance, by the pressure cylinder 3-1 and multiple seal chambers for forming of piston 3-2 in m-th of balance component
The sum of cross-sectional area be Am（Piston 3-2 cross-sectional areas and connecting rod 3-5 in each balance component in all seal chambers is transversal
The sum of the difference of area）, the sum of cross-sectional area A m of all balance components should be equal to bellows effective area Ac（Refer to GB/T
12777-2008 standards）, that is, meeting following formula, i represents the number of the seal chamber in balance component,,For the cross-sectional area of i-th of seal chamber in m-th of balance component.
Wherein, j is the total quantity of balance component（1）
With 4 force analysis of flange B, under working condition, pressure thrust that flange is subject to
c （2）
The power on piston is acted on by pressure p by balance component 3
（3）
By formula（1）Known to：
（4）
F2It is transferred to flange B 4 through piston 3-2 and connecting rod 3-5, the pressure thrust F all with flange B 41Equal in magnitude, side
To on the contrary, the opposite force complete equipilibrium that the pressure thrust for therefore acting on flange can be provided by balance component 3, expands to eliminate
The active force to equipment is saved, realizes pressure balance.
Bit shift compensation mode：When in pipeline full of the medium that pressure is p, work bellows 2 is compressed with pipe deforming
Or stretch, because compatibility of deformation needs, flange A 1 will drive pressure cylinder 3-1 to move, and flange B 4 drives connecting rod 3-5 movements, into
And piston 3-2 movements are pushed or pull on, the seal chamber volume that pressure cylinder 3-1 and piston 3-2 are constituted adjusts therewith, reaches new again
Stable state.When the bellows 2 that works stretches, the medium in all seal chamber 3-4-1 subtracts with the sliding of piston 3-2
Few, when the bellows 2 that works compresses, the medium in all seal chamber 3-4-1 increases with the sliding of piston 3-2, seal chamber
When volume change occurs, the medium in seal chamber will pass through the hollow knot of medium flow field through-hole 4-1, connecting rod 3-5 on flange B 4
Structure and trepanning 3-5-1 are discharged or are supplemented, the pressure medium in the course of work in all seal chamber 3-4-1 always in pipeline
Pressure medium is consistent, by above-mentioned equilibrium principle it is found that expansion joint is in pressure balance always.
Embodiment 1
A kind of straight pipe pressure-balancing type expansion joint of no balance wave includes as shown in Figure 3,4：Flange A 1, it work bellows 2, puts down
Weigh component 3 and flange B 4.Wherein balance component 3 includes single annular pressure cylinder 3-1,3-2. piston, 3-3. sealing rings A, sealing
Enclose B 3-7, sealing ring C3-8,3-6. connecting rod.
Work bellows 2 is welded to connect with flange A 1 and flange B 4, forms single axial expansion joint, balance component 3
With flanged joint, wherein pressure cylinder 3-1 and flange A 1 is welded and fixed, and multiple connecting rod 3-5 and flange B 4 is welded and fixed, circumference
It is distributed in 2 outside of work bellows.
Balance component 3 forms and connection：Diagram cyclic structure, interior setting piston 3-2, piston can be used in pressure cylinder 3-1 bodies
Sealing ring A 3-3 and sealing ring B 3-7 are arranged between 3-2 and pressure cylinder 3-1 side walls to be sealed, are separated by piston 3-2
It is seal chamber 3-4-1 that top, which is below discharge chamber 3-4-2, and piston 3-2 can be movable relatively between pressure cylinder 3-1.More companies
The one end extension bar 3-5 is connect with piston 3-2, and the other end is connect across pressure cylinder 3-1 bottom openings with flange B 4.Connecting rod 3-5 with
Pressure cylinder 3-1 bottom openings are sealed by sealing ring C 3-8.Connecting rod 3-5 is hollow-core construction, is had in seal chamber 3-4-1
The one end connecting rod 3-5 side-wall hole 3-5-1, trepanning 3-5-1 run through connecting rod 3-5 wall thickness, make seal chamber 3-4-1 and connecting rod 3-
5 hollow-core construction connection, as shown in Figure 5.
L-type media communication hole shown in multiple Fig. 3 is arranged in flange B 4, and hole one end is arranged on 4 centre bore side walls of flange B,
The other end is arranged on 4 end faces flange B, and is penetrated through in connecting rod 3-5 connections, L-type media communication hole circumference on flange B 4
Distribution.Under working condition, pipeline internal medium is flowed through through L-type media communication hole on flange B 4 inside connecting rod 3-5, by its side wall
Through hole enters in seal chamber M shown in Fig. 4.
Equilibrium principle：Under working condition, two end flanges of expansion joint are connect with piping, and inside is situated between full of the medium that pressure is p
Matter from 4 endoporus side wall L-type media communication holes of flange B, flowed into through connecting rod 3-5 be made of pressure cylinder 3-1 and piston 3-2 it is close
It seals in chamber M, pressure is consistent with pipeline pressure.As shown in Figure 6.
To realize pressure balance, this expansion joint only have there are one balance component, and only exist one in a balance component
A seal chamber, the seal chamber M cross-sectional area As being made of pressure cylinder 3-1 and piston 3-21（I.e. piston 3-2 cross-sectional areas with it is multiple
The difference of connecting rod 3-5 cross-sectional areas）Bellows effective area Ac should be equal to（Refer to GB/T 12777-2008 standards）, that is, meet
Following formula.
=A11 （1）
With 4 force analysis of flange B, under working condition, pressure thrust that flange is subject to
Ac（2）
The power on piston is acted on by pressure p by balance component 3
（3）
By formula（1）Known to：
（4）
F2It is transferred to flange B 4 through piston 3-2 and connecting rod 3-5, the pressure thrust F all with flange B 41Equal in magnitude, side
To on the contrary, the opposite force complete equipilibrium that the pressure thrust for therefore acting on flange can be provided by balance component 3, expands to eliminate
The active force to equipment is saved, realizes pressure balance.
Bit shift compensation mode：When in pipeline full of the medium that pressure is p, work bellows 2 is compressed with pipe deforming
Or stretch, because compatibility of deformation needs, flange A 1 will drive pressure cylinder 3-1 to move, and flange B 4 drives connecting rod 3-5 movements, into
And piston 3-2 is pushed to move, the seal chamber M volumes that pressure cylinder 3-1 and piston 3-2 are constituted adjust therewith, reach new steady again
Determine state.Volume change occurs for seal chamber M, and the medium in seal chamber will pass through L-type media communication hole, connection on flange B 4
The hollow-core construction and side wall through hole of bar 3-5 is discharged or is supplemented, in the process the pressure medium in seal chamber M always with pipeline
Interior pressure medium is consistent, by above-mentioned equilibrium principle it is found that expansion joint is in pressure balance always.
Embodiment 2
As shown in Figure 8, Figure 9, a kind of straight pipe pressure-balancing type expansion joint of no balance wave, with embodiment the difference is that,
There are two pressure chamber 3-4 set up and down for tool in single balance component, and piston 3-2 is arranged in each pressure chamber 3-4,
Sealing ring A 3-3 and sealing ring B 3-7 are arranged between piston 3-2 and pressure cylinder 3-1 side walls to be sealed, separated by piston 3-2 and
At top be below discharge chamber 3-4-2 be seal chamber 3-4-1, piston 3-2 can be movable relatively between pressure cylinder 3-1.
Pressure chamber in single balance component is separated by diaphragm plate, and a sealing is respectively present in two pressure chambers
Chamber, as seal chamber M1 and seal chamber M2, connecting rod 3-5 are first connect with the piston of lower section, are then passed through underlying piston and diaphragm plate,
It is connect with upper plunger, when piston that connecting rod 3-5 is passed through should ensure that the sealing of seal chamber, can be in tabula when passing through diaphragm plate
Sealing ring D 3-10 are added between plate 3-9 and connecting rod 3-5 and ensure that the seal chamber M2 on upper layer is not connected to the discharge chamber of lower layer, this
When connecting rod 3-5 it is as shown in figure 11.
Equilibrium principle：Under working condition, two end flanges of expansion joint are connect with piping, and inside is situated between full of the medium that pressure is p
Matter from 4 endoporus side wall L-type media communication holes of flange B, flowed into through connecting rod 3-5 be made of pressure cylinder 3-1 and piston 3-2 it is close
It seals in chamber M1 and seal chamber M2, pressure is consistent with pipeline pressure.As shown in figure 11.
To realize pressure balance, this expansion joint only have there are one balance component, and only exist two in a balance component
A seal chamber, by the cross-sectional area A m of pressure cylinder 3-1 and piston 3-2 the seal chamber M1 formed and the sum of seal chamber M2（That is piston
The difference of 3-2 cross-sectional areas and multiple connecting rod 3-5 cross-sectional areas）Bellows effective area Ac should be equal to（Refer to GB/T 12777-
2008 standards）, that is, meet following formula.
（1）
With 4 force analysis of flange B, under working condition, pressure thrust that flange is subject to
Ac（2）
The power on piston is acted on by pressure p by balance component 3
（3）
By formula（1）Known to：
（4）
F2It is transferred to flange B 4 through piston 3-2 and connecting rod 3-5, the pressure thrust F all with flange B 41Equal in magnitude, side
To on the contrary, the opposite force complete equipilibrium that the pressure thrust for therefore acting on flange can be provided by balance component 3, expands to eliminate
The active force to equipment is saved, realizes pressure balance.
Bit shift compensation mode：When in pipeline full of the medium that pressure is p, work bellows 2 is compressed with pipe deforming
Or stretch, because compatibility of deformation needs, flange A 1 will drive pressure cylinder 3-1 to move, and flange B 4 drives connecting rod 3-5 movements, into
And piston 3-2 is pushed to move, the seal chamber M1 and seal chamber M2 volumes that pressure cylinder 3-1 and piston 3-2 are constituted are adjusted therewith, again
Reach new steady s tate.When the bellows 2 that works stretches, the medium in seal chamber M1 and seal chamber M2 is with piston 3-2
Sliding reduce, when the bellows 2 that works compresses, medium in seal chamber M1 and seal chamber M2 with piston 3-2 sliding
Increase, the medium in seal chamber M1 and seal chamber M2 will pass through the hollow knot of L-type media communication hole, connecting rod 3-5 on flange B 4
Structure and side wall through hole are discharged or are supplemented, in the process the pressure medium in seal chamber M1 and seal chamber M2 always in pipeline
Pressure medium is consistent, by above-mentioned equilibrium principle it is found that expansion joint is in pressure balance always.
Embodiment 3
As shown in fig. 7, a kind of straight pipe pressure-balancing type expansion joint of no balance wave, other structures are same as Example 1, difference
It is in setting is independent multiple components in balance component 3, circumferentially disposed along work 2 outer circle of bellows, has 8 by diagram
A balance component, there are one seal chambers for each balance component tool.
Equilibrium principle：Under working condition, two end flanges of expansion joint are connect with piping, and inside is situated between full of the medium that pressure is p
Matter from 4 endoporus side wall L-type media communication holes of flange B, flowed into through connecting rod 3-5 be made of pressure cylinder 3-1 and piston 3-2 it is close
It seals in chamber M, pressure is consistent with pipeline pressure.
To realize pressure balance, the seal chamber M cross-sectional areas that each balance component is made of pressure cylinder 3-1 and piston 3-2
The sum of Am should be equal to bellows effective area Ac（Refer to GB/T 12777-2008 standards）, that is, meet following formula.
（1）
A1=A11 A2=A21 A3=A31 A4=A41
A5=A51 A6=A61 A7=A71 A8=A81 (2)
With 4 force analysis of flange B, under working condition, pressure thrust that flange is subject to
Ac（3）
The power on piston is acted on by pressure p by balance component 3
（4）
By formula（1）Known to：
（5）
F2It is transferred to flange B 4 through piston 3-2 and connecting rod 3-5, the pressure thrust F all with flange B 41Equal in magnitude, side
To on the contrary, the opposite force complete equipilibrium that the pressure thrust for therefore acting on flange can be provided by balance component 3, expands to eliminate
The active force to equipment is saved, realizes pressure balance.
Bit shift compensation mode：When in pipeline full of the medium that pressure is p, work bellows 2 is compressed with pipe deforming
Or stretch, because compatibility of deformation needs, flange A 1 will drive pressure cylinder 3-1 to move, and flange B 4 drives connecting rod 3-5 movements, into
And piston 3-2 is pushed to move, the volume in 8 seal chamber M1 that pressure cylinder 3-1 and piston 3-2 are constituted adjusts therewith, reaches again
To new steady s tate.It is that the medium in seal chamber will be connected to by L-type medium on flange B 4 that volume change, which occurs, for seal chamber
Hole, the hollow passageway of connecting rod 3-5 and side-wall hole are discharged or are supplemented, in the process the pressure medium in seal chamber always with
Pipeline internal medium pressure is consistent, by above-mentioned equilibrium principle it is found that expansion joint is in pressure balance always.
Embodiment 4
As shown in figure 12, a kind of straight pipe pressure-balancing type expansion joint of no balance wave, other structures are same as Example 2, different
Place is that setting is independent multiple components in balance component 3, circumferentially disposed along work 2 outer circle of bellows, has by diagram
8 balance components, there are two seal chambers for each balance component tool.
Equilibrium principle：Under working condition, two end flanges of expansion joint are connect with piping, and inside is situated between full of the medium that pressure is p
Matter from 4 endoporus side wall L-type media communication holes of flange B, flowed into through connecting rod 3-5 be made of pressure cylinder 3-1 and piston 3-2 it is close
It seals in chamber M, pressure is consistent with pipeline pressure.As shown in figure 11.
To realize pressure balance, the seal chamber M cross-sectional areas that each balance component is made of pressure cylinder 3-1 and piston 3-2
The sum of Am should be equal to bellows effective area Ac（Refer to GB/T 12777-2008 standards）, that is, meet following formula.
（1）
A1=A11+A12 A2=A21+A22 A3=A31+A13 A4=A41+A42
A5=A51+A52 A6=A61+A62 A7=A71+A72 A8=A81+A82 (2)
With 4 force analysis of flange B, under working condition, pressure thrust that flange is subject to
Ac（3）
The power on piston is acted on by pressure p by balance component 3
（4）
By formula（1）Known to：
（5）
F2It is transferred to flange B 4 through piston 3-2 and connecting rod 3-5, the pressure thrust F all with flange B 41Equal in magnitude, side
To on the contrary, the opposite force complete equipilibrium that the pressure thrust for therefore acting on flange can be provided by balance component 3, expands to eliminate
The active force to equipment is saved, realizes pressure balance.
Bit shift compensation mode：When in pipeline full of the medium that pressure is p, work bellows 2 is compressed with pipe deforming
Or stretch, because compatibility of deformation needs, flange A 1 will drive pressure cylinder 3-1 to move, and flange B 4 drives connecting rod 3-5 movements, into
And piston 3-2 is pushed to move, the volume in 16 seal chambers that pressure cylinder 3-1 and piston 3-2 are constituted adjusts therewith, reaches again
New steady s tate.Volume change occurs for seal chamber, the medium in seal chamber will by L-type media communication hole on flange B 4,
The hollow passageway and side-wall hole of connecting rod 3-5 is discharged or is supplemented, in the process the pressure medium in seal chamber always with pipe
Pressure medium is consistent in road, by above-mentioned equilibrium principle it is found that expansion joint is in pressure balance always.
The preferred embodiment that these are only the present invention, is not limited to or limits the present invention.For grinding for this field
Study carefully or technical staff for, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made by
Any modification, equivalent substitution, improvement and etc. should be included within the protection domain that the present invention is stated.
Claims (4)
1. a kind of straight pipe pressure-balancing type expansion joint of no balance wave is equipped with work bellows（2）, in work bellows（2）'s
Axial both ends are connected separately with flange A（1）With flange B（4）, in work bellows（2）Exterior circumferential direction flange A（1）
With flange B（4）Between be equipped at least one balance component（3）, it is characterised in that：The balance component（3）By pressure cylinder（3-
1）, piston（3-2）And connecting rod（3-5）Composition, pressure cylinder（3-1）It is fixed at flange A（1）On, pressure cylinder（3-1）Inside press
Work bellows（2）Axial direction is equipped at least one pressure chamber（3-4）, in each pressure chamber（3-4）Inside set there are one with
Pressure chamber（3-4）Cavity wall match and in pressure chamber（3-4）The piston of interior sliding setting（3-2）, pressure chamber（3-4）By piston
（3-2）It is divided into seal chamber（3-4-1）And discharge chamber（3-4-2）, in discharge chamber（3-4-2）The pressure cylinder of side（3-1）It is equipped with
The gas vent being connected with extraneous air（3-6）, connecting rod（3-5）Axis with work bellows（2）Axis it is parallel, even
Extension bar（3-5）Center be hollow-core construction, connecting rod（3-5）One end stretch to pressure chamber（3-4）It is interior and successively with it is all
Piston（3-2）It is connected, in each seal chamber（3-4-1）Connecting rod（3-5）It is equipped with trepanning（3-5-1）, trepanning（3-5-1）
Make connecting rod（3-5）Hollow-core construction and the seal chamber（3-4-1）It is connected, connecting rod（3-5）The other end and flange B（4）
It is connected, in flange B（4）It is equipped with connection work bellows（2）Inner cavity and connecting rod（3-5）The media communication hole of hollow-core construction
（4-1）, media communication hole（4-1）, connecting rod（3-5）Hollow-core construction and seal chamber（3-4-1）It is sequentially communicated to form medium discharge
Or supplement channel, when work bellows（2）When stretching, piston（3-2）With connecting rod（3-5）It is slidable in the axial direction, institute
There is seal chamber（3-4-1）Interior medium is with piston（3-2）Sliding reduce, when work bellows（2）When compressing, piston
（3-2）With connecting rod（3-5）It is slidable in the axial direction, all seal chambers（3-4-1）Interior medium is with piston（3-2）Sliding increase
Add, balance component is made to act on the power on piston with flange by equal with pressure thrust.
2. a kind of straight pipe pressure-balancing type expansion joint of no balance wave as described in claim 1, it is characterised in that：It is multiple described
Pressure cylinder（3-1）It is arranged in one annular and is fixed on flange A（1）On.
3. a kind of straight pipe pressure-balancing type expansion joint of no balance wave as described in claim 1, it is characterised in that：It is multiple described
Pressure cylinder（3-1）It is arranged independently of each other in flange A（1）On.
4. a kind of straight pipe pressure-balancing type expansion joint of no balance wave as described in claim 1, it is characterised in that：Jie
Matter intercommunicating pore（4-1）Section be L-type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325434.7A CN108644520A (en) | 2018-04-12 | 2018-04-12 | A kind of straight pipe pressure-balancing type expansion joint of no balance wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325434.7A CN108644520A (en) | 2018-04-12 | 2018-04-12 | A kind of straight pipe pressure-balancing type expansion joint of no balance wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108644520A true CN108644520A (en) | 2018-10-12 |
Family
ID=63746274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810325434.7A Pending CN108644520A (en) | 2018-04-12 | 2018-04-12 | A kind of straight pipe pressure-balancing type expansion joint of no balance wave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108644520A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503403A (en) * | 2020-04-03 | 2020-08-07 | 洛阳双瑞特种装备有限公司 | Constraint type corrugated pipe expansion joint capable of compensating axial displacement |
| CN111503390A (en) * | 2020-04-03 | 2020-08-07 | 洛阳双瑞特种装备有限公司 | Pressure balance type bellows expansion joint |
| CN118705462A (en) * | 2024-04-22 | 2024-09-27 | 中国船舶集团有限公司第七一九研究所 | Ultra-high pressure metal bellows compensation device |
| CN119222417A (en) * | 2024-11-28 | 2024-12-31 | 江苏明凯机械有限公司 | A metal expansion joint for low temperature environment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503403A (en) * | 2020-04-03 | 2020-08-07 | 洛阳双瑞特种装备有限公司 | Constraint type corrugated pipe expansion joint capable of compensating axial displacement |
| CN111503390A (en) * | 2020-04-03 | 2020-08-07 | 洛阳双瑞特种装备有限公司 | Pressure balance type bellows expansion joint |
| CN111503390B (en) * | 2020-04-03 | 2024-04-19 | 中船双瑞(洛阳)特种装备股份有限公司 | Pressure balance type bellows expansion joint |
| CN111503403B (en) * | 2020-04-03 | 2024-04-19 | 中船双瑞(洛阳)特种装备股份有限公司 | Constrained bellows expansion joint capable of compensating axial displacement |
| CN118705462A (en) * | 2024-04-22 | 2024-09-27 | 中国船舶集团有限公司第七一九研究所 | Ultra-high pressure metal bellows compensation device |
| CN118705462B (en) * | 2024-04-22 | 2025-10-03 | 中国船舶集团有限公司第七一九研究所 | Ultra-high pressure metal bellows compensation device |
| CN119222417A (en) * | 2024-11-28 | 2024-12-31 | 江苏明凯机械有限公司 | A metal expansion joint for low temperature environment |
| CN119222417B (en) * | 2024-11-28 | 2025-04-18 | 江苏明凯机械有限公司 | A metal expansion joint for low temperature environment |
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Application publication date: 20181012 |