CN203730991U - Externally-pressed axial expansion joint - Google Patents
Externally-pressed axial expansion joint Download PDFInfo
- Publication number
- CN203730991U CN203730991U CN201420122200.XU CN201420122200U CN203730991U CN 203730991 U CN203730991 U CN 203730991U CN 201420122200 U CN201420122200 U CN 201420122200U CN 203730991 U CN203730991 U CN 203730991U
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- Prior art keywords
- tube
- wall
- slip ring
- outer tube
- bellows
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- Expired - Lifetime
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- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model discloses an externally-pressed axial expansion joint. The externally-pressed axial expansion joint comprises a connection tube, an outer tube, a slip ring, a corrugated tube, an inner tube, a stationary ring and columnar pins, wherein the outer tube and the inner tube are in nested fit, the corrugated tube sleeves the external wall of one segment, located in the internal chamber of the outer tube, of the inner tube, the slip ring and the stationary ring are respectively connected with tube openings of the two ends of the corrugated tube in a sealed manner, the internal hole of the slip ring is in sealed connection with the left end of the inner tube, and the external wall of the stationary ring is in sealed connection with a tube opening of the right end of the outer tube. According to the externally-pressed axial expansion joint, a key bar is fixedly connected to the internal wall of the left end of the outer tube along the axial direction, an opening groove matched with the key bar is formed in the external wall of the slip ring, and a track guiding type anti-torsion structure for the corrugated tube is formed through the matching between the key bar and the slip ring; in addition, the columnar pins are uniformly distributed on an outer tube wall of the same circumference, and a corrugated tube left moving limit structure is formed by the columnar pins which radially penetrate through the outer tube wall; due to the structure, the corrugated tube is subjected to external pressure and stretches in a balanced way, most importantly, the corrugated tube moves straightly under the matching between the key bar and the slip ring, and in addition, the left moving of the corrugated tube is limited by the columnar pins, so that the accident of damage caused by excessive deformation is avoided.
Description
Technical field
The utility model relates to a kind of pipe safety device, and specifically, the utility model relates to a kind of expansion joint for heat supply pipeline nose balance, and especially a kind of bellows bears the axial expansion joint of external pressure.
Background technique
When urban heating network and industrial pipe network operation, produces because built-in medium temperature and pressure are different expand with heat and contract with cold accordingly distortion and displacement, the internal stress of initiation has destructiveness, the particularly harmfulness maximum of end thrust to pipe network thus.In engineering, for the safety of pipe network, need to configure expansion joint at interdependent node, to absorb or compensating axial thrust and displacement.The bellows of single layer structure for commercially available expansion joint built-in elastic unit sample, although the type expansion joint structure relatively simple, make easily, can reach expection compensation object.But prior art products, because of reasons in structure, also exposes some very important problems in actual applications, greatest problem is easy unstability while bearing the bellows resiliently deformable of interior pressure; Secondly problem is large, the flexible deficiency of bellows stiff of single layer structure, and compensating movement is slow; Another problem is to lack antitorque structure, is unfavorable for reversing conditional pipe network supporting.
Model utility content
The utility model is mainly for the deficiencies in the prior art, proposes a kind of simple in structure, volume is little, flexibility is sufficient, compensation response is fast, anti-twisting property is strong outer pressure axial type expansion joint.
The utility model is achieved through the following technical solutions technical goal.
Outer pressure axial type expansion joint, it comprises adapter, outer tube, slip ring, bellows, inner tube, stationary ring and pin.Described outer tube and inner tube are thin-wall circular steel pipe, two pipe concentric gap fits, be arranged on one section of outer wall of inner tube of outer tube bore and be set with bellows, at the bellows two ends mouth of pipe be tightly connected respectively supporting slip ring and stationary ring, slip ring endoporus and inner tube left end are wherein tightly connected, and stationary ring outer wall is connected with outer tube right-hand member ferrule.Described adapter bore is equal to interior pipe orifice, and the adapter coaxial with inner tube is sealedly connected on the outer tube left end mouth of pipe.Its improvements are: on described outer tube left end inwall, direct-axis is to being fixedly connected with key bar, and slip ring outer wall is provided with the opening slot matching with key bar, and both coordinate the anti-twisting structure of the formation rail-guided formula of bellows.Described pin is straight pin, is positioned at uniform 3～6 pins on the same circumference of key bar right-hand member at outer tube wall, and the pin that radially runs through outer tube wall forms bellows left lateral limit structure.
Bellows in said structure is thin wall multi-layer structure, adopts the flexible foot of bellows of thin wall multi-layer structure, compensation responding fast, and compensation rate is large.Bellows is stacked 2～4 layers of common rolling-forming afterwards with the thin plate of thick 0.2mm～2mm.
Key sliver transvers section in said structure is rectangle, and the opening slot on slip ring outer wall is similarly rectangle.Certainly, key sliver transvers section also can be made U-shaped or V-type, on the slip ring outer wall matching, is provided with equally the opening slot matching.
The utility model compared with prior art, has following good effect:
1, the opening slot cooperating structure on key bar and the slip ring outer wall being fixedly connected with on outer tube wall is simple, and guiding is reliable, only revolve anti-turn round effective;
2, bellows adopts thin wall multi-layer structure, and rigidity is little, flexibility is sufficient, compensation is flexible;
3, in structure, bellows bears external pressure, reasonable stress, steadily flexible;
4, the pin of radially installing on outer tube wall, forms built-in corrugated pipe left lateral limit structure, avoids bellows overstretching to damage.
Brief description of the drawings
Fig. 1 is that the utility model structure is partly cutd open schematic diagram.
Fig. 2 is Fig. 1 A-A generalized section.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, the utility model is described in further detail.
Outer pressure axial type expansion joint shown in Fig. 1, it comprises adapter 1, outer tube 2, slip ring 3, bellows 4, inner tube 5, stationary ring 6 and pin 7.Described outer tube 2 and inner tube 5 are thin-wall circular steel pipe, outer tube 2 and the inner tube 5 concentric gap fits of straight tube equally, stretch on one section of inner tube 5 outer wall in outer tube 2 inner chambers and be set with bellows 4, at the bellows 4 two ends mouths of pipe be tightly connected respectively supporting slip ring 3 and stationary ring 6, slip ring 3 endoporus and inner tube 5 left ends are wherein tightly connected, and stationary ring 6 outer walls of the other end are connected with outer tube 2 right-hand member ferrules.Bear outer laminated structure through the above-mentioned bellows 4 that connects and composes, and formation inner tube 5, slip ring 3 and bellows 4 can do the structure of axial stretching activity with respect to outer tube 2.The bellows 4 bore DN=50mm of the present embodiment, pressure-bearing 4.0Mpa, little because of specification, pressure-bearing is higher, requires bellows 4 will have good compensation response sensitivity, therefore supporting bellows 4 adopts the common rolling-forming of thin plate of 3 bed thickness 0.25mm.Described adapter 1 co-axial seal is connected to the outer tube 2 left end mouths of pipe, and adapter 1 is coaxial with inner tube 5, and two mouth of pipe footpaths equate, guarantee that velocity of medium is stable, reduce liquid resistance.The utility model is only done axial stretching activity in the time moving in order to ensure bellows 4, do not rotate motion, on outer tube 2 left end inwalls, be provided with the key bar 2.1 of axial connection, also on slip ring 3 outer walls, be provided with the opening slot matching with key bar 2.1, both coordinate the formation anti-twisting structure of rail-guided formula bellows 4 as shown in Figure 1.Key bar 2.1 cross sections in the present embodiment adopt rectangle, and the opening slot being located on slip ring 3 outer walls is rectangle equally, both Spielpassung.Bellows 4 belongs to the pressure restraining element of resiliently deformable, 4 surpass scope action for fear of bellows and produce plasticity damage, the present embodiment is positioned at uniform 3 cylindrical pins 7 on the same circumference of key bar 2.1 right-hand members at outer tube 2 walls, the pin 7 that radially runs through outer tube 2 walls forms bellows 4 left lateral limit structures.This structure plays restricted driving effect, guarantees expansion joint normally operation within the scope of design objective, and the damage accident of bellows 4 excessive deformations can not occur.
In the utility model, key bar 2.1 shape of cross sections, except rectangle described in above-described embodiment, also can be made U-shaped or V-type, as long as the key bar 2.1 of location is slidably matched with the slip ring 3 that is provided with respective openings groove, can reach the anti-effect of turning round of bellows 4.Bellows 4 is thin wall multi-layer structure, is mainly configured according to supporting specification and pressure rating, all can realize expection object.
Claims (5)
1. an outer pressure axial type expansion joint, it comprises adapter (1), outer tube (2), slip ring (3), bellows (4), inner tube (5), stationary ring (6) and pin (7); Described outer tube (2) and inner tube (5) are thin-wall circular steel pipe, two pipe concentric gap fits, be arranged on one section of inner tube (5) outer wall of outer tube (2) inner chamber and be set with bellows (4), at bellows (4) the two ends mouth of pipe be tightly connected respectively supporting slip ring (3) and stationary ring (6), slip ring (3) endoporus wherein and inner tube (5) left end are tightly connected, and stationary ring (6) outer wall is connected with outer tube (2) right-hand member ferrule; Described adapter (1) bore is equal to inner tube (5) endoporus, and the adapter (1) coaxial with inner tube (5) is sealedly connected on outer tube (2) the left end mouth of pipe; It is characterized in that: on described outer tube (2) left end inwall, direct-axis is to being fixedly connected with key bar (2.1), and slip ring (3) outer wall is provided with the opening slot matching with key bar (2.1), both coordinate the anti-twisting structure of the formation rail-guided formula of bellows (4); Described pin (7) is straight pin, is positioned at uniform 3～6 pins (7) on the same circumference of key bar (2.1) right-hand member at outer tube (2) wall, and the pin (7) that radially runs through outer tube (2) wall forms bellows (4) left lateral limit structure.
2. outer pressure axial type expansion joint according to claim 1, is characterized in that: described bellows (4) is thin wall multi-layer structure, and every bed thickness 0.2mm～2mm, is stacked 2～4 layers of common rolling-forming.
3. outer pressure axial type expansion joint according to claim 1, is characterized in that: described key bar (2.1) cross section is rectangle, and the opening slot on slip ring (3) outer wall is similarly rectangle.
4. outer pressure axial type expansion joint according to claim 1, is characterized in that: described key bar (2.1) cross section is U-shaped, and the opening slot on slip ring (3) outer wall is similarly U-shaped.
5. outer pressure axial type expansion joint according to claim 1, is characterized in that: described key bar (2.1) cross section is V-arrangement, and the opening slot on slip ring (3) outer wall is similarly V-arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122200.XU CN203730991U (en) | 2014-03-19 | 2014-03-19 | Externally-pressed axial expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122200.XU CN203730991U (en) | 2014-03-19 | 2014-03-19 | Externally-pressed axial expansion joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203730991U true CN203730991U (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420122200.XU Expired - Lifetime CN203730991U (en) | 2014-03-19 | 2014-03-19 | Externally-pressed axial expansion joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203730991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939702A (en) * | 2014-03-19 | 2014-07-23 | 江苏曙光压力容器有限公司 | External pressure type axial expansion joint |
-
2014
- 2014-03-19 CN CN201420122200.XU patent/CN203730991U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939702A (en) * | 2014-03-19 | 2014-07-23 | 江苏曙光压力容器有限公司 | External pressure type axial expansion joint |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140723 |