CN201723897U

CN201723897U - Novel maintenance-free rotary compensator

Info

Publication number: CN201723897U
Application number: CN201020211054XU
Authority: CN
Inventors: 陈墅庚
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-01
Filing date: 2010-06-01
Publication date: 2011-01-26
Anticipated expiration: 2020-06-01

Abstract

A novel maintenance-free rotary compensator belongs to the technical field of maintenance-free rotary compensator structures used on heat distribution pipelines in the petroleum industry, the chemical industry, the light industry, the thermodynamic industry, the metallurgical industry and the like. The novel maintenance-free rotary compensator comprises an inner pipe, an outer gland, a spring, a material pressing flange, an outer casing flange, an outer casing, a reducer nozzle, a shaft center righting ring, a steel ball, sealing packing, an outer casing internal bearing platform and the like, wherein the inner pipe is inserted into the outer casing, the sealing packing is filled between the end surface of the outer casing internal bearing platform and the end surface of an inner pipe convex outer ring, the internal end of the reducer nozzle is inserted into the outer casing and is inlaid on the internal side of the inner pipe convex outer ring, the sealing packing is filled between the end surface of the inner pipe convex outer ring and the end surface of a reducer pipe bearing platform, and the reducer pipe bearing platform is welded and fixed with the outer casing; the outer gland is sheathed at the external end of the material pressing flange and the external end of the material pressing flange ejects against the outer gland through the spring; and the shaft center righting ring is sheathed at the external end of the outer gland and is inlaid on the internal side of the outer gland, and the steel ball is arranged between the outer annular surface of the inner pipe convex outer ring and the inner wall of the outer casing. By adopting the structure, the utility model has the advantages that the precision is high, the torque is small, the bearing capacity is stronger, the pressure loss is smaller, the medium flowing direction is not limited and the application scope and the maintenance-free characteristic of the rotary compensator are further expanded.

Description

Novel maintenance-free rotary compensator

Technical field

The present invention relates to a kind of novel maintenance-free rotary compensator, belong to and be used for the technical field of compensation length automatically, belong to the technical field of the maintenance-free rotary compensator structure of using on the heat distribution pipeline in the industries such as oil, chemical industry, light industry, heating power, metallurgy specifically apart from the compensation device structure of heat distribution pipeline.

Background technique

Traditional compensation of pipeline technology has multiple structural type, wherein have traditional natural U-shaped to bend formula, telescopic, corrugated and spherical formula compensation of pipeline mode, but because existence takes up room greatly, complementary range is short, installation is limited to, reasons such as cost and operating cost height.At present the heat distribution pipe network project adopt in a large number have flexible arrangement, the whirl compensator of easy for installation, advantage such as compensation rate is big, overall cost is low.

See for details: the improved whirl compensator of China Patent No. ZL02258709.8

China Patent No. ZL200520074933.1 maintenance-free rotary compensator,

China Patent No. ZL200610041301.4 pipe used high pressure resistant rotary compensator

The accurate whirl compensator of China Patent No. ZL200720128801.1

The buried maintenance-free rotary compensator of China Patent No. ZL200720033902.0

The directionless whirl compensator of the single gland of China Patent No. ZL200720149721.4

The two directionless whirl compensators of gland of China Patent No. ZL200720149720.X

China Patent No. ZL200720173047.3 high-performance pipeline whirl compensator

China Patent No. ZL200920007062.X is withstand voltage accurate whirl compensator

The high pressure resistant accurate whirl compensator of China Patent No. ZL200920007063.4

The novel corrosion resistant pipeline of China Patent No. ZL200920007064.9 whirl compensator

The accurate whirl compensator of China Patent No. ZL200920007065.3 high pressure pipe line

China Patent No. ZL200920007066.8 double-sealing high pressure resistant rotary compensator

Above series product all possess characteristics such as compensation rate is big, flexible arrangement, improvement has in various degree also been arranged on the structure, but also existed not enough:

The improved whirl compensator of example one: China Patent No. ZL02258709.8

The deficiency of these two products of China Patent No. ZL200610041301.4 pipe used high pressure resistant rotary compensator is

1. the junction excesssive gap of interior pipe and reducer pipe can produce eddy current at this position in the flowing medium motion, increased the pressure loss of flowing medium, moreover MEDIA FLOW is to suffering restraints.

2. the steel ball in the Gland outer annular recess contacts for line style with the interior pipe outside, surface of contact is too small, add that there is certain interval in steel ball and the interior pipe outside, and the steel ball between interior steel ball of Gland outer annular recess and the interior cushion cap of outer sleeve is between the two apart from too short, it is poor that effect is set upright in the axle center, pipe self torque when rotatablely moving is excessive in causing easily, can't bear in rotatablely moving the laterally huge blind plate power of torsion and thermal expansion of pipeline, cause eccentric wear thus easily, to making the generation leakage way to stuffing box packing.

4. the reducing adapter is a stepped shape with sealing seat (outer sleeve) connection part, and the weld seam at this position can't carry out normal carrying out flaw detection.

Example two: China Patent No. ZL200520074933.1 maintenance-free rotary compensator, the accurate whirl compensator of China Patent No. ZL200720128801.1

These three products of the buried maintenance-free rotary compensator of China Patent No. ZL200720033902.0 exist deficiency to be:

1. spring compression flange, Gland method inner ring are not provided with steel ball, for tubular axis heart degree in guaranteeing can only be the gap control between flange inner ring and interior pipe outer ring to minimum zone, though the axle center degree is under control like this, but pipe frictional resistance when rotating relatively is excessive in can forming, add that the rolling ring of cushion cap and the outer interannular of interior pipe is that line style contacts in the outer sleeve, frictional resistance is just bigger.Like this when thermal compensation moves, just cause the distortion of immovable point girder steel easily, even cause pipeline to arch upward and the explosion of pipeline welding position.

2. owing to only adopted single sealing means, bearing capacity and sealability all are restricted.

The directionless whirl compensator of the single gland of example three: China Patent No. ZL200720149721.4

China Patent No. ZL200720173047.3 high-performance pipeline whirl compensator

Though these eight products are set upright in the axle center, interior pipe and reducer pipe engage and aspect of performance such as sealing configuration has had certain raising, in realization, also exist not enough.

Summary of the invention

The invention provides a kind of novel maintenance-free rotary compensator.Realize to solve the deficiency that at present existing whirl compensator exists, it is stronger to reach bearing capacity, and crushing is littler, and MEDIA FLOW is to limited, the purpose that long-play need not be safeguarded.

For reaching described purpose technological scheme of the present invention be:

A kind of novel maintenance-free rotary compensator comprises, cushion cap, stuffing box packing B, the protruding outer shroud of interior pipe, steel ball II, stuffing box packing C and reducer pipe cushion cap are formed in interior pipe, outer gland, spring, binder flange, outer sleeve flange, bolt and nut, outer sleeve, reducing adapter, axle center centering ring, steel ball I, stuffing box packing A, the outer sleeve, wherein:

Described outer sleeve one end is provided with groove, this groove be arranged on the reducer pipe cushion cap corresponding groove and be welded to connect and extend and constitute reducing and take over; The other end one of this outer sleeve is equipped with the outer sleeve flange, the interior cushion cap of described outer sleeve is arranged at this outer sleeve inner ring surface and between this outer sleeve flange and described outer sleeve groove, sealing filler A and stuffing box packing B are sheathed on the both sides of managing outer ring surface in this and being positioned at this outer sleeve cushion cap;

An end of pipe in the protruding outer shroud one ring of pipe is located in described, the stepped structural ring of its anchor ring and end face is enclosed within an end of reducer pipe cushion cap; Should be equipped with groove by interior outer ring surface of managing protruding outer shroud, at least one steel ball II is positioned at the inwall of described groove and contact outer sleeve; Described stuffing box packing C is positioned at the inboard space that forms jointly with reducing adapter (8) inner outer shroud of reducer pipe cushion cap and the protruding outer shroud of pipe and outer sleeve;

Described binder flange cross section is the L type, ring set is in this on pipe, the end of the short end of its L type contact sealing filler A, the long end of its L type outside is by spring contact ring set outer gland on the pipe in this, the axle center centering ring embeds in the outer gland and lock ring is managed in this on outer ring surface, and the steel ball I places between the axle center centering ring anchor ring relative with outer gland.

Should outer gland, binder flange and outer sleeve flange are fastenedly connected by bolt and nut, and at least one spring is outside this between gland and the binder flange.

It is that interior external diameter is identical that this reducing is taken over interior tube seam place, both coaxial correspondences; Pipe outer shroud in the axle center centering ring is located at, combine closely for fine finishing in interior pipe outer shroud and axle center centering ring inboard.

The stepped structure of interior edge face of pipe its exterior edge face of protruding outer shroud and interior pipe in being somebody's turn to do, the external end head of the protruding outer shroud of interior pipe inserts the outside contact stuffing box packing C that reducing is taken over the inner.

Sealing filler A, stuffing box packing B, stuffing box packing C are metal enhancement mode Expanded graphite, the fiber reinforced Expanded graphite of titanium or the Expanded graphite that has added antioxidant.

Sealing filler C places in the common space that forms of outer shroud of reducer pipe cushion cap and the protruding outer shroud opposing end surface of interior pipe and outer sleeve inner wall and reducing adapter the inner.

Between this binder flange and outer gland end face four springs are housed at least.

This spring is vertical spring, disc spring or disk spring.

This axle center centering ring embeds in the re-entrant angle of inboard, outer gland outer end; Between the axle center centering ring anchor ring relative at least ten steel ball I are housed with outer gland.

The protruding outer shroud outer ring surface of pipe is provided with at least ten steel ball II contact outer sleeve inner walls is housed in the groove in being somebody's turn to do.

This outer sleeve extends the reducing that constitutes by the reducer pipe cushion cap and takes over the T-shaped structure shape in cross section, reducing is taken over and is being with the reducer pipe cushion cap to insert in the outer sleeve, the protruding outer shroud of pipe inboard made the interior edge face of reducer pipe cushion cap be tight against stuffing box packing C in the inner that reducing is taken over embedded.

Adopt technological scheme of the present invention because outer gland, binder flange and outer sleeve flange are connected and fixed by bolt and nut; Between outer gland and binder flange end face spring is housed, the axle center centering ring embeds inboard, outer gland outer end, is provided with the steel ball I between axle center centering ring and the corresponding anchor ring of outer gland.Be provided with stuffing box packing A in the common space that forms, cushion cap outer end in interior pipe outer shroud and binder flange L type binder end face and outer sleeve inner wall and the outer sleeve.Be provided with stuffing box packing B in the space of the inner common formation of cushion cap in interior pipe outer shroud and the protruding outer shroud interior edge face of interior pipe and outer sleeve inner wall and the outer sleeve.Interior pipe protruding outer shroud exterior edge face and outer sleeve inner wall and reducer pipe cushion cap and reducing are taken in the common space that forms of inner outer shroud and are provided with stuffing box packing C.One end of overcoat pipe racks internal groove and the corresponding groove of reducer pipe cushion cap are welded to connect and extend and constitute the reducing adapter.It is that inside and outside footpath is identical with interior tube seam place that such structure makes reducing take over inner, both coaxial correspondences are like a pipe, the end clearance only is that (2～4mm), the improvement of reducing position structure has improved bearing capacity greatly, has eliminated the pressure loss simultaneously again between the two.Reducing is taken over and to be the be more convenient for carrying out flaw detection of pipeline attachment weld of straight length.Steel ball I, steel ball II had both played the control of the interior tubular axis heart, played the double effects of the frictional resistance when reducing inner and outer pipe and rotating relatively again.And steel ball I and steel ball II be between the two apart from having reached maximization, and better effects if is set upright in the axle center.Combining closely for anchor ring in the inboard and interior pipe of the axle center centering ring outside, has both eliminated the abrasion of interior pipe outer ring surface, improved the bending resistance of interior pipe again.Between outer gland and the binder flange end face spring is housed, the tension of spring self directly plays and makes the pressuring action of binder flange binder end to stuffing box packing A when the wearing and tearing decrement appears in stuffing box packing A in long-time running.Stuffing box packing A, stuffing box packing B and stuffing box packing C not only play the lubrication when inner and outer pipe is relative to be rotated but also possess end face and the multi-sealed effect of anchor ring.Sealability has obtained guaranteeing more reliably.

Adopt the technical program bearing capacity stronger, crushing is littler, and MEDIA FLOW is to limited, and long-play need not be safeguarded.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the local structure for amplifying schematic representation of the present invention.

Description of reference numerals:

1. interior pipe

2. outer gland

3. spring

4. binder flange

5. outer sleeve flange

6. bolt and nut

7. outer sleeve

8. reducing is taken over

9. axle center centering ring

10. steel ball I

11. stuffing box packing A

12. cushion cap in the outer sleeve

13. stuffing box packing B

14. the protruding outer shroud of interior pipe

15. steel ball II

16. stuffing box packing C

17. reducer pipe cushion cap

Embodiment

Below in conjunction with accompanying drawing technological scheme of the present invention is described in detail as follows.

Be structural representation of the present invention and local enlarged diagram as shown in Figure 1 and Figure 2, as can be seen from Figure,

A kind of novel maintenance-free rotary compensator, pipe 1, outer gland 2, spring 3, binder flange 4, outer sleeve flange 5, bolt and nut 6, outer sleeve 7, reducing adapter 8, axle center centering ring 9, steel ball I 10, stuffing box packing A11, the interior cushion cap 12 of outer sleeve, stuffing box packing B13, the protruding outer shroud 14 of interior pipe, steel ball II 15, stuffing box packing C16 and reducer pipe cushion cap 17 are formed in comprising, wherein:

Described outer sleeve 7 is a tubular construction, pipe 1 and reducing were taken over (as Fig. 1) on 8 outer shrouds in integral body was enclosed within, one end of outer sleeve 7 is provided with groove (groove of welding usefulness), this groove be arranged on the reducer pipe cushion cap 17 corresponding groove and be welded to connect and extend and constitute reducing and take over 8, as Fig. 1 reducer pipe cushion cap 17 and reducing adapter 8 is tubular structure, one port outer shroud is convexly equipped with to be put the projection that the cross section is a rectangle (making its reducer pipe cushion cap 17 cross sections is the T type, pipe 1 in the butt joint of one end, the other end extends into the part of reducing adapter 8), the groove of welding usefulness is set on the projection, and (this groove dock with groove on the outer sleeve 7, and the corresponding soldering opening that forms is connected outer sleeve 7 and extends to form reducing adapter 8 by welding with reducer pipe cushion cap 17.

The other end of this outer sleeve 7 (with respect to the other end that groove is arranged) one is equipped with outer sleeve flange 5, is evenly distributed to few a through hole, the axis of this at least one through hole and outer sleeve 7 axis coaxles along the end face of outer sleeve flange 5.(cross section is a rectangle to cushion cap 12 in the described outer sleeve, as Fig. 1) be arranged at (or being integrally formed at) these outer sleeve 7 inner ring surfaces and between this outer sleeve flange 5 and described outer sleeve 7 grooves, (can be on the inner ring surface of both positions in getting), sealing filler A11 (for circle structure) and stuffing box packing B13 (for circle structure) are sheathed on pipe 1 outer ring surface in this and are positioned at the two ends of this outer sleeve cushion cap 12, form stuffing box packing A11 and stuffing box packing B13 in the two ends clamping outer sleeve cushion cap 12 also lock ring on interior pipe 1 outer ring surface;

An end of pipe 1 (formed the state that extends out naturally from interior pipe 1 in the protruding outer shroud 14 one rings of pipe were located in described, as Fig. 1), the stepped structural ring of its anchor ring and end face (cross section) is enclosed within an end (in fact just being enclosed within the end that the groove place near reducer pipe cushion cap 17 projectioies leans out) of reducer pipe cushion cap 17; Should be equipped with groove by interior outer ring surface of managing protruding outer shroud 14, at least ten steel ball II 15 are positioned at the inwall of described groove and contact outer sleeve 7, and steel ball II 15 is the rolling mated condition in groove; Described stuffing box packing C16 (for circle structure) is positioned at reducer pipe cushion cap 17 and protruding outer shroud 14 of pipe and the outer sleeve 7 inboard and common spaces (as Fig. 1 and Fig. 2) that form of reducing adapter (8) inner outer shroud;

Described binder flange 4 is circular, the cross section is the L type, ring set is managed on 1 in this, the end of the short end of its L type contact sealing filler A11, outer gland 2 on 1 is managed by spring 3 contact ring sets in the long end of its L type outside in this, axle center centering ring 9 embeds in the outer gland 2 and lock ring is managed in this on 1 outer ring surface, and steel ball I 10 places between axle center centering ring 9 and outer gland 2 both corresponding anchor rings.

Should outer gland 2, binder flange 4 and outer sleeve flange 5 are fastenedly connected by bolt and nut 6, and at least four springs 3 are outside this between gland 2 and the binder flange 4.

It is that interior external diameter is identical with interior pipe 1 seam crossing that this reducing takes over 8, both coaxial correspondences; Pipe 1 outer shroud in axle center centering ring 9 is located at, combine closely for fine finishing in interior pipe 1 outer shroud and axle center centering ring 9 inboards.

The stepped structure of interior edge face of pipe protruding outer shroud 14 its exterior edge faces and interior pipe 1 in being somebody's turn to do, the external end head of the protruding outer shroud 14 of interior pipe inserts the outside contact stuffing box packing C16 that reducing is taken over 8 the inners, the protruding outer shroud 14 contact stuffing box packing C16 of pipe promptly, to be convexly equipped with the cross section of putting be the high spot of rectangle to the reducer pipe cushion cap 17 port outer shrouds of further taking over 8 places by stuffing box packing C16 contact reducing again; Form the structure of extruding form between them.

Sealing filler A11, stuffing box packing B13, stuffing box packing C16 are metal enhancement mode Expanded graphite, the fiber reinforced Expanded graphite of titanium or the Expanded graphite that has added antioxidant.

Sealing filler C16 places reducer pipe cushion cap 17 and protruding outer shroud 14 both opposing end surfaces of interior pipe and outer sleeve 7 inwalls and reducing to take in the space of the common formation of outer shroud of 8 the inners.

(or along the evenly distribution ringwise of described end face) the optimum state is for being equipped with four springs 3 at least between this binder flange 4 and outer gland 2 both end faces.

This spring 3 is vertical spring, disc spring or disk spring.

This axle center centering ring 9 embeds in the re-entrant angle of inboard, outer gland 2 outer end; The optimum state dress (setting) has at least ten (being evenly distributed) steel ball I 10 between axle center centering ring 9 and outer gland 2 both corresponding anchor rings.

The optimum state has at least ten (being evenly distributed) steel ball II 15 contact outer sleeves 7 inwalls for adorning (setting) in the groove that protruding outer shroud 14 outer ring surfaces of pipe are provided with in being somebody's turn to do.

This outer sleeve 7 extends the reducing that constitutes by reducer pipe cushion cap 17 and takes over the T-shaped structure shape in 8 cross sections, reducing is taken over 8 and is being with reducer pipe cushion cap 17 to insert in the outer sleeve 7, make reducing take over 8 the protruding outer shroud of the interior pipe of the inner embedding 14 inboards, make the interior edge face of reducer pipe cushion cap 17 be tight against stuffing box packing C16.

Novel maintenance-free rotary compensator is when connection: outer sleeve is equipped with outer sleeve flange 5 outside 7 one terminations, outer sleeve 7 middle inside are provided with cushion cap 12 in the outer sleeve, in the outer sleeve cushion cap 12 be shaped as rectangular preiection, outer sleeve 7 another terminations are provided with and the corresponding bevel for welding of reducer pipe cushion cap 17 outer shrouds.In the protruding outer shroud 14 of pipe be located in the inner outside of pipe 1, the outer ring surface of the protruding outer shroud 14 of interior pipe and interior pipe 1 and the inner be protrude stepped.Reducing adapter 8 and reducer pipe cushion cap 17 T-shaped shapes, interior pipe 1 inserts in the outer sleeve 7, and stuffing box packing B13 is contained in cushion cap 12 and protruding outer shroud 14 both end faces of interior pipe in the outer sleeve.Reducing is managed protruding outer shroud 14 inboards in taking over and also embedding in the 8 inner insertion outer sleeves 7, manages between protruding outer shroud 14 and reducer pipe cushion cap 17 both end faces in stuffing box packing C16 is contained in.Reducer pipe cushion cap 17 docks with outer sleeve 7 to be welded to connect fixing and to extend and constitutes reducing adapter 8.Pipe 1 outer shroud in binder flange 4 is sleeved on, stuffing box packing A11 are sleeved between binder flange 4 and interior cushion cap 12 both end faces of outer sleeve, and outer gland 2 is sleeved on binder flange 4 outer ends, and binder flange 4 outer ends are by the outer gland 2 of spring 3 contacts; Outer gland 2 outer ends are inboard to be provided with an annular recess facing to interior pipe 1 outer shroud direction, described recess and be provided with an annular groove, and at least ten steel ball I 10 are placed in one.Pipe 1 outer shroud and embed the recess of outer gland 2 inboards in axle center centering ring 9 is sleeved on, described steel ball I 10 are to place between axle center centering ring 9 and outer gland 2 both relative anchor rings (or phase-contact surface).Protruding outer shroud 14 outer ring surfaces of interior pipe are provided with an annular groove, and steel ball (II) contact outer sleeve 7 inwalls are housed in the groove.Outer gland 2, binder flange 4 are connected locking with outer sleeve flange 5 by adopting bolt and nut 6.This structural type makes:

1, in described pipe 1 and reducing take over 8 and both inside and outside footpaths of end face seam crossing identical, coaxial correspondence is a pipe seemingly, and between both end faces the gap have only (2～4mm), almost do not have pressure channel; Both eliminated because the interior pipe and reducer pipe joining portion excesssive gap causes flowing medium at the volley at this position generation eddy current the pressure loss, can adapt to again the medium double fluid to.

2, between both end faces of described binder flange 4 outer ends spring 3 is housed, when the wearing and tearing decrement appearred in stuffing box packing A11, the tension of spring 3 self directly played the effect that presses closely of 4 couples of stuffing box packing A11 of binder flange.

3, described axle center centering ring 9 and interior pipe 1 both combine closely for the fine finishing anchor ring, both eliminated the abrasion of interior pipe outer ring surface, improved bending resistance again.

4, described steel ball I, steel ball II have played interior tubular axis heart control, have reduced the double effects that inner and outer pipe rotates frictional resistance relatively.

Lubrication when 5, described stuffing box packing A11, stuffing box packing B13, stuffing box packing C16 had both played inner and outer pipe and rotate has relatively possessed the multi-sealed effect of anchor ring and end face again.

6, described structural type has the precision height, and friction factor, self torque are littler, and bending resistance, bearing capacity are stronger, and sealing is reliable, function admirable, and crushing is little, and MEDIA FLOW is to limited, the characteristics of pipeline long-time running Maintenance free.

Claims

1. novel maintenance-free rotary compensator, comprise that cushion cap (12), stuffing box packing B (13), the protruding outer shroud of interior pipe (14), steel ball II (15), stuffing box packing C (16) and reducer pipe cushion cap (17) are formed in interior pipe (1), outer gland (2), spring (3), binder flange (4), outer sleeve flange (5), bolt and nut (6), outer sleeve (7), reducing adapter (8), axle center centering ring (9), steel ball I (10), stuffing box packing A (11), the outer sleeve, it is characterized in that:

Described outer sleeve (7) one ends are provided with groove, this groove be arranged on reducer pipe cushion cap (17) and go up corresponding groove and be welded to connect and extend and constitute reducing and take over (8); The other end one of this outer sleeve (7) is equipped with outer sleeve flange (5), in the described outer sleeve cushion cap (12) be arranged at this outer sleeve (7) inner ring surface and be positioned at this outer sleeve flange (5) with described outer sleeve (7) groove between, sealing filler A (11) and stuffing box packing B (13) are sheathed on this interior both sides of managing (1) outer ring surface and being positioned at this outer sleeve cushion cap (12);

Pipe protruding outer shroud (14) one ring is located at an end of interior pipe (1) in described, and the stepped structural ring of its anchor ring and end face is enclosed within an end of reducer pipe cushion cap (17); Should be equipped with groove by interior outer ring surface of managing protruding outer shroud (14), at least one steel ball II (15) is positioned at the inwall of described groove and contact outer sleeve (7); Described stuffing box packing C (16) is positioned at reducer pipe cushion cap (17) and protruding outer shroud of pipe (14) and the inboard space that forms jointly with reducing adapter (8) inner outer shroud of outer sleeve (7);

Described binder flange (4) cross section is the L type, and ring set is managed in this on (1), the end of its L type short end contact sealing filler A (11), and outer gland (2) on (1) is managed by spring (3) contact ring set in the long end of its L type outside in this; Axle center centering ring (9) embeds in the outer gland (2) also lock ring and manages in this on (1) outer ring surface, and steel ball I (10) places between axle center centering ring (9) and both relative anchor rings of outer gland (2).

Be somebody's turn to do outer gland (2), binder flange (4) and outer sleeve flange (5) are fastenedly connected by bolt and nut (6), and at least one spring (3) is positioned between this outer gland (2) and the binder flange (4).

2. novel maintenance-free rotary compensator according to claim 1 is characterized in that it is that interior external diameter is identical with interior pipe (1) seam crossing that this reducing is taken over (8), both coaxial correspondences; Axle center centering ring (9) is located at interior pipe (1) outer shroud, combines closely for fine finishing in interior pipe (1) outer shroud and axle center centering ring (9) inboard.

3. novel maintenance-free rotary compensator according to claim 1, it is characterized in that managing in this stepped structure of interior edge face of its exterior edge face of protruding outer shroud (14) and interior pipe (1), the external end head of the protruding outer shroud of interior pipe (14) inserts reducing and takes over (8) inner outside contact stuffing box packing C (16).

4. novel maintenance-free rotary compensator according to claim 1 is characterized in that sealing filler A (11), stuffing box packing B (13), stuffing box packing C (16) are metal enhancement mode Expanded graphite, the fiber reinforced Expanded graphite of titanium or the Expanded graphite that has added antioxidant.

5. novel maintenance-free rotary compensator according to claim 1 is characterized in that sealing filler C (16) places in the common space that forms of outer shroud of reducer pipe cushion cap (17) and both opposing end surfaces of the protruding outer shroud of interior pipe (14) and outer sleeve (7) inwall and reducing adapter (8) the inner.

6. novel maintenance-free rotary compensator according to claim 1 is characterized in that between this binder flange (4) and both end faces of outer gland (2) four springs (3) being housed at least.

7. according to claim 1 or 6 described novel maintenance-free rotary compensators, it is characterized in that this spring (3) is vertical spring, disc spring or disk spring.

8. novel maintenance-free rotary compensator according to claim 1 is characterized in that this axle center centering ring (9) embeds in the re-entrant angle of outer gland (2) inboard, outer end; Between axle center centering ring (9) and both relative anchor rings of outer gland (2) at least ten steel ball I (10) are housed.

9. novel maintenance-free rotary compensator according to claim 1 is characterized in that pipe protruding outer shroud (14) outer ring surface is provided with in this at least ten steel ball II (15) contact outer sleeves (7) inwall is housed in the groove.

10. novel maintenance-free rotary compensator according to claim 1, it is characterized in that this outer sleeve (7) extends the reducing that constitutes by reducer pipe cushion cap (17) and takes over the T-shaped structure shape in (8) cross section, reducing is taken over (8) and is being with reducer pipe cushion cap (17) to insert in the outer sleeve (7), pipe protruding outer shroud (14) inboard made the interior edge face of reducer pipe cushion cap (17) be tight against stuffing box packing C (16) in the inner that makes reducing take over (8) embedded.