CN101818837A - Pressure-compensated rotary joint - Google Patents

Abstract

The invention relates to a pressure-compensated rotary joint, which belongs to the technical field of compensators. The rotary joint mainly comprises an outer sleeve, an inner tube and a gland flange, wherein a thrust ring and a connection baffle ring are fixed in the outer sleeve; a first baffle ring and a second baffle ring are fixed on the periphery of the inner tube, and the wall of the inner tube is provided with a through hole; the gland flange is provided with an extension ring; the end face of the first baffle ring is contacted with the thrust ring, and a rolling piece is installed between the end face of the second baffle ring and the opposite end face of the connection baffle ring; a seal ring is filled between the end face of the extension ring and the connection baffle ring, and a backing ring is installed in the extension ring; a sealing ring, of which the inner circle is provided with a groove, is installed between the first baffle ring and the second baffle ring; and the groove is communicated with the through hole in the wall of the inner tube. In the invention, a reliable double seal is formed by the seal ring and the sealing ring between the outer sleeve and the inner tube, and the abrasion of the sealing ring can be compensated, thereby effectively avoiding leakage at the movable joint of the pipeline for a long time.

Description

Pressure-compensated rotary joint

Technical field

The present invention relates to a kind of compensation swivel joint, especially a kind of pressure-compensated rotary joint belongs to the compensator technical field.

Background technique

Understand according to the claimant, there is the insecure problem of sealability in existing whirl compensator when carrying high-pressure medium.Adopt the modified model whirl compensator of double seal to carry under the situation of high-pressure medium at large diameter pipeline, the interior pressure thrust that pressure medium causes may cause the stuffing box packing excessive deformation of the sealing unit that is increased and failure phenomenon occur.

Retrieval is found, application number is that 02258709.8 Chinese patent application discloses a kind of improved rotary compensator, comprise interior pipe, steel tubing in different shapes joint, outer sealing seat and the gland flange that connects with hold-down bolt that be equipped with of interior pipe, with be equipped with a boss on the interior pipe at the steel tubing in different shapes joint place of combining, be provided with ball in the groove that forms between boss and the sealing seat, be provided with the groove of opening in the gland flange, be placed with ball in the described groove facing to interior pipe.In order to solve the reliable inadequately problem of sealing that above-mentioned prior art exists, application number is that 200610041301.4 Chinese patent application discloses a kind of pipe used high pressure resistant rotary compensator that has new sealing configuration, it comprises the core pipe, sealing gland, sealing seat, connecting tube, one end of core pipe inserts in the connecting tube, one end of connecting tube and sealing seat is fixedly linked and is sleeved on the core pipe, on the core pipe, be provided with the annular outer platform, on sealing seat, be provided with annular inner convex platform, sealing gland is sleeved on the core pipe and inserts in the other end of sealing seat and offsets with the face seal part, sealing gland links to each other by link with sealing seat, it is characterized in that between sealing seat and core pipe, being formed with a Seal cage, in described Seal cage, edge face sealing member is installed.Yet this sealing configuration only relies on the elastic packing effect of Sealing self, during, sealing part abrasion too high when pressure medium in the pipeline, still leaks unavoidably.

Summary of the invention

The objective of the invention is to: the deficiency at above-mentioned prior art exists proposes a kind of pressure-compensated rotary joint that can guarantee reliable sealing, thereby effectively avoids the leakage of the movable joint of pipeline.

In order to reach above purpose, pressure-compensated rotary joint of the present invention mainly inserts the interior pipe in the outer sleeve by the outer sleeve with end flange (typical outer sleeve has sleeve to be welded with reducer), an end and is enclosed within interior pipe gland flange outer and that fixedly connected with end flange to be formed; Fixedly mount thrust ring spaced apart in the plug-in mounting end endoporus of described outer sleeve and be connected baffle ring; The insertion end cylindrical of pipe fixedly has first baffle ring and second baffle ring of axially spaced-apart in described, and has perforation on the tube wall between first baffle ring and second baffle ring; Described gland flange has the extended loop that stretches into outer sleeve; The end face that described first baffle ring deviates from second baffle ring contacts with described thrust ring, between the end face that described second baffle ring deviates from first baffle ring and the described opposing end surface that is connected baffle ring roll piece is housed; The extended loop end face of described gland flange is filled with seal ring with described the connection between the baffle ring, between the cylindrical of the endoporus of described extended loop and described interior pipe gasket ring is housed; Circle has the seal ring of groove in installing between described first baffle ring and second baffle ring, and described groove communicates with perforation on the inner pipe wall.

In the work, when being subjected to Buckling stress, the outer sleeve rotation relatively of interior pipe, thereby the stress of elimination pipeline.The present invention not only seal ring and the seal ring between outer sleeve and the interior pipe has formed reliable double seal, and the pressure medium in the pipeline can act on the groove of seal ring by the perforation on the inner tubal wall, thereby keep seal ring to be close to first baffle ring, second baffle ring and outer sleeve inner wall, play practical seal action, the pressure of medium is big more, seal ring pastes tightly more, wearing and tearing that therefore can the compensation sealing ring, the permanently effective leakage of avoiding the movable joint of pipeline.

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of one embodiment of the invention.

Embodiment

Embodiment one

The pressure-compensated rotary joint of present embodiment as shown in Figure 1, mainly the outer sleeve that is welded bysleeve 3 and reducer 8, an end insert theinterior pipe 1 in thesleeve 3 and be enclosed withinpipe 1outer gland flange 2 forms.Thesleeve 3 of outer sleeve has end flange, and end flange is fixedlyed connected by clampingbolt 13 with gland flange 2.In thesleeve 3 plug-in mounting end endoporus of outer sleeve thethrust ring 7 of fixed installation circular section spaced apart be connected baffle ring 9.The insertion end cylindrical ofinterior pipe 1 fixedly has first baffle ring 11 andsecond baffle ring 10 of axially spaced-apart, and has perforation on the tube wall between first baffle ring and second bafflering.Gland flange 2 has the extended loop that stretches into outer sleeve sleeve 3.The end face that first baffle ring 11 deviates fromsecond baffle ring 10 contacts with thrust ring 7.Between the end face thatsecond baffle ring 10 deviates from first baffle ring 11 and the opposing end surface that is connectedbaffle ring 9ball 6 is housed, has the arc depression that matches withball 6 owing to connect the contiguous endoporus of the end face place ofbaffle ring 9, thereforeball 6 is arranged in this arc depression, and contact, thereby form reasonably axially and radially spacing with the cylindrical of interior pipe.The extended loop end face ofgland flange 2 be connected theseal ring 5 that flexible material such as filling peroxidating fluorine rubber is made between thebaffle ring 9, the endoporus of the cylindrical of extended loop and sleeve 3 matches, and thegasket ring 4 that teflon is made is housed between the cylindrical of the endoporus of extended loop and interior pipe 1.Circle has the seal ring 12 of groove in installing between first baffle ring 11 andsecond baffle ring 10, the cross section of groove is rectangle (also can be semicircular arc), communicate with the perforation oninterior pipe 1 tube wall, the cylindrical of seal ring 12 has the groove that the cross section is a semicircle, when the pressure medium in the pipeline acts in the rectangular recess of seal ring, the bi-side of seal ring will be adjacent to first baffle ring, second baffle ring, and sleeve lining will be close in the semicircle groove two ends of cylindrical, form labyrinth sealing, the pressure of medium is big more, paste tightly more, thereby guarantee sealing reliably, even seal ring has wearing and tearing, also can under the pressure medium effect, obtain mending the permanently effective leakage of avoiding the movable joint of pipeline.

During work,, therefore can reduce frictional force, improve rotating effect because second baffle ring is equipped with ball with being connected between baffle ring.And the thrust ring and first baffle ring in the sleeve offset, and the pipe play plays position-limiting action in can preventing.The teflon gasket ring of installing in the gland flange has further reduced the frictional force of rotating between gland flange and interior pipe, and the coaxality when having guaranteed operation.Facts have proved that this design and traditional roll structure relatively the phenomenon of clamping stagnation occurs after pipe or ball get rusty in can avoiding, guarantee the rotating property of product.

The advantage of present embodiment can further reduce: 1) by pressure compensation mode, increased the pressure-compensated self sealing structure on the basis of traditional whirl compensator, realized multi-sealed, therefore very reliable; 2) sealing configuration is not subjected to the restriction of caliber size, has enlarged the product application area; 3) effect of adopting the teflon gasket ring to replace ball to play interior pipe location and reduce friction, the phenomenon of ball is blocked in the corrosion of having avoided interior pipe to cause owing to external environment condition, has strengthened the rotation reliability of product; 4) thrust ring has prevented the axial float of interior pipe, has improved the stability of pipe-line system.

In addition to the implementation, the present invention can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.

Claims (7)

1. a pressure-compensated rotary joint mainly inserts the interior pipe in the outer sleeve by the outer sleeve with end flange, an end and is enclosed within interior pipe gland flange outer and that fixedly connected with end flange and forms; It is characterized in that: fixedly mount thrust ring spaced apart in the plug-in mounting end endoporus of described outer sleeve and be connected baffle ring; The insertion end cylindrical of pipe fixedly has first baffle ring and second baffle ring of axially spaced-apart in described, and has perforation on the tube wall between first baffle ring and second baffle ring; Described gland flange has the extended loop that stretches into outer sleeve; The end face that described first baffle ring deviates from second baffle ring contacts with described thrust ring, between the end face that described second baffle ring deviates from first baffle ring and the described opposing end surface that is connected baffle ring roll piece is housed; The extended loop end face of described gland flange is filled with seal ring with described the connection between the baffle ring, between the cylindrical of the endoporus of described extended loop and described interior pipe gasket ring is housed; Circle has the seal ring of groove in installing between described first baffle ring and second baffle ring, and described groove communicates with perforation on the inner pipe wall.

2. pressure-compensated rotary joint according to claim 1 is characterized in that: the cross section of round recessed is a rectangle in the described seal ring, and the cylindrical of described seal ring has the groove that the cross section is a semicircle.

3. pressure-compensated rotary joint according to claim 1 and 2 is characterized in that: the contiguous endoporus of the end face of described connection baffle ring place has the arc depression that matches with ball, and described ball is arranged in described arc depression, and contacts with the cylindrical of interior pipe.

4. pressure-compensated rotary joint according to claim 3 is characterized in that: described outer sleeve is welded by sleeve and reducer.

5. pressure-compensated rotary joint according to claim 4 is characterized in that: described thrust ring cross section is for circular.

6. pressure-compensated rotary joint according to claim 5 is characterized in that: described seal ring adopts the peroxidating fluorine rubber to make.

7. pressure-compensated rotary joint according to claim 6 is characterized in that: described gasket ring adopts teflon to make.

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