CN2300786Y - Pressure steel pipe expansion joint - Google Patents

Abstract

The utility model relates to a pressure steel pipe expansion joint device. The joint end of two short pipes and a bellows segment 5 which is connected with the joint end are arranged in a support ring 6; the wave crest of the outward wave of the bellows segment contacts or tends to contact with the inner wall face of the support ring; a wave core body 12 is arranged in the wave cavity of an inward wave; a gap is arranged between the surfaces of the wave core body and the wave cavity; both ends of the support ring are free ends or one end of the support ring is a free end, and the other end of the support ring is connected with the short pipes; the joint end of the short pipe of a water entry end is provided with an antiwear ring 9; the generated axial telescoping of a steel pressure pipe can be satisfied by the flexibility of the bellows segment; the support ring and the wave core body can play the role of rigid support when the bellows segment endures radial pressure. The utility model has the advantages of no leakage and reliable running.

Description

A kind of extension section for pressure steel pipeline device

The utility model relates to a kind of when laying penstock, is used for its pipe end piecing devices that connect, that have telescopicing performance, such as being used between the diversion steel pipe pipeline section of water power plant and diversion steel pipe and being connected of spiral case feed-water end etc.

When laying the metallic conduit that is used for fed sheet of a media, the metallic conduit of especially big caliber or big caliber, diversion steel pipe pipeline such as the water power plant, owing to being subjected to the fed sheet of a media physical property under the running state or produced by the physical environment Temperature Influence expands with heat and contract with cold, the easy build-up of pressure pipeline damage of consequent temperature stress.For this reason, interconnecting end and need establish slip joint device (also claim flexible section header) at metal tube.

Though its structure is simple, there is the major defect of leaking in traditional sleeve-type expansion joint device.Use this traditional slip joint device, need in the practice ponding well to be set, and the water that will leak into aperiodically in the ponding well is discharged at slip joint device position.This not only needs to increase operating cost, and needs to increase artificial operation or maintenance, especially also has unsafe factor when carrying the medium of higher pressure or high pressure.

For addressing the above problem, recently Yan Jiu " the pipeline expansion joint device that does not leak ", its structure sees that (number of patent application of this slip joint device is 98230056.5 to Fig. 1, the applying date is 980116), this device has two short tubes (diagram short tube 1 and short tube 2) and sleeve pipe 3, the interface end of two short tubes all is positioned at sleeve pipe, sleeve pipe 3 one ends are connected with the tube wall of a short tube (diagram short tube 1), sleeve pipe the other end internal face contacts with another short tube (diagram short tube 2) end outer wall cooperation, and certain matching gap arranged, be that sleeve pipe 3 the other ends are for to cooperate with short tube 2 outer wall, and can produce the free end of slippage to axial, flexible gap 4 is arranged between the interface end of two short tubes, should in the flexible gap corrugated pipe segment 5 be set, the corrugated pipe segment two ends become sealing state to be connected with the interface end of two short tubes respectively.Because the corrugated pipe segment that is located in the flexible gap has axial scalable performance under external force, and its two ends are that sealing state is connected with two short tube interface end respectively, its technique effect one is to satisfy the defective that overcomes " leakage ", the 2nd, can satisfy the axial stretching that metallic conduit produces because of temperature effect, effectively eliminate pipe temperature stress, technique effect is obvious.In addition, described corrugated pipe segment is also as the transmission pipeline section of medium via this position.But still there is following deficiency in this device: because intention being set and acting on of this device middle sleeve 3 is to be used for the support of two short tubes and protective action is played in the corrugated pipe segment outside, set corrugated pipe segment is again the transmission pipeline section of medium simultaneously, when being used for big caliber, during the penstock of higher pressure, corrugated pipe segment need bear corresponding big radial pressure, and the excessive corrugated pipe segment of wall thickness is difficult to realize on preparation process, in this case, the corrugated pipe segment of thin-shell construction will produce excessive outward bulge bulging deformation because of bearing excessive radial pressure, promptly so-called " unstability " causes its body or damages easily with the connection part of short tube; Next is the pressure of transmission medium when higher, will aggravate the wearing and tearing of inner wall surface thereof, the wear extent that this may bear with respect to the steel tube place that certain wall thickness is arranged, and the working life of the corrugated pipe segment of thin-shell type is with incompatible.Therefore, " the pipeline expansion joint device that does not leak " carried under the medium situation of low pressure or general pressure in limited being used to, and its operational reliability is just guaranteed.

The purpose of this utility model provides the expansion device that a kind of penstock is used, and this device neither produces and leaks when being used for the penstock of big caliber, higher pressure, has stable operational reliability again.

The purpose of this utility model is achieved in that its structure comprises two short tubes, in the flexible gap between the interface end of two short tubes corrugated pipe segment is set, and the two ends of this corrugated pipe segment are that sealing state is connected with the interface end of two short tubes respectively, satisfies not produce leakage; The support ring that corrugated pipe segment is played the radial support effect is set, the interface end of two short tubes and be located between the two short tube interface end in the flexible gap and be that the corrugated pipe segment that sealing state is connected all is positioned at support ring with two short tube interface end, the support ring two end part are free end, or the one end is connected with the stud tube wall of this end, and the other end is a free end.Free end is arranged in the support ring both ends or one end, to satisfy the needs of penstock when the axial stretching.When using this device, the outer end by its two short tube is connected the formation conveyance conduit with adjacent steel tube end part respectively; Export-oriented wave-wave top contact in the corrugated pipe segment or trend towards contacting the internal face of support ring, when corrugated pipe segment bears under the radial pressure situation, when it produces little distortion or trends towards being out of shape, support ring just plays the rigid support effect to corrugated pipe segment, radial pressure is then by the corrugated pipe segment transmission, bear by the support ring that can be provided with sufficient intensity, can avoid the corrugated pipe segment body effectively or damage with the connection part of two short tube interface end; In the inward wave cavity in the corrugated pipe segment wave core body is set, be provided with one between the surface in ripple chamber and the wave core body surface and satisfy the interior gap that only in regime of elastic deformation, produces distortion to the wave-wave body, the effect in this gap is when steel pipe produces axial stretching, to the wave-wave body corresponding flexible space is arranged in satisfying, the setting value in this gap also consider in to the wave-wave body when bearing big radial pressure, its distortion can only be in the regime of elastic deformation, the effect that wave core body is set is, bearing the big distortion that radial pressure produced when also being in the regime of elastic deformation when interior to the wave-wave body, top, inward wave cavity surface promptly contacts with the corresponding surface of wave core body, wave core body promptly plays the rigid support effect to interior to the wave-wave body, radial pressure is through transmitting, then bear, produce " unstability " and be unlikely destroyed to the wave-wave body in avoiding by the support ring that is provided with sufficient intensity.Thereby possesses stable operational reliability.

Because this device being provided with can be to the passive support ring of corrugated pipe segment, being provided with in the inward wave cavity of corrugated pipe segment can be to the interior wave core body that plays the rigid support effect to the wave-wave body, and be provided with corrugated pipe segment required deformation space of its body when flexible, make the corrugated pipe segment of thin-shell construction have two kinds of actual motion effects, promptly when the penstock axial stretching, keep its intrinsic scalable ride quality, when bearing big radial pressure, then become the action effect of inferior rigid body member, has corresponding strength, can effectively avoid destroyed, significant technique effect is to have guaranteed that this device is being used for big caliber, operational reliability during the penstock of higher pressure.

Fig. 1 is the structural front view of " the pipeline expansion joint device that does not leak ";

Fig. 2 is the utility model embodiment 1 a structural front view;

Fig. 3 is a kind of enforcement structural front view of the wave core body of the utility model device;

Fig. 4 is the another kind of structural front view of implementing of the wave core body of the utility model device;

Fig. 5 is embodiment 2 a structural front view.

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

Embodiment 1.Two short tubes are that the interface end of short tube 1 and short tube 2 all is positioned at support ring 6, in the flexible gap 4 between the two short tube interface end corrugated pipe segment 5 is set, corrugated pipe segment adopts stainless steel, and two ends are that sealing state is connected with the interface end of two short tubes respectively, and this example is welding.The quantity of the length of flexible gap size and corrugated pipe segment, ripple joint is calculated according to penstock axial stretching amount, take all factors into consideration definite, Figure 2 shows that three ripple joints, the tube wall welding of the right part of support ring and the short tube of this end 1 also can connect by other modes, makes both become rigid unitary, the left end of support ring is a free end, when penstock produced axial stretching, support ring, short tube 1 produced with respect to short tube 2 and move axially, and corrugated pipe segment is promptly thereupon by axial compression or stretching; Left end at support ring is that free end is provided with pressure ring 7, and pressure ring is connected with bolt with support ring, at the internal face place of its junction seal ring 8 is set.In addition, be on the short tube interface end face of water intake end wear-resistant ring 9 to be set at short tube 1, with of the wearing and tearing of effective minimizing medium to the corrugated pipe segment internal face, increase the service life, the working life and the penstock of thin-shell type corrugated pipe segment are adapted, the left end of wear-resistant ring is that the other end and short tube 2 are between the short tube interface end of waterexit end gapped 10, want to satisfy the displacement of penstock when extending axially, in the outer wall of wear-resistant ring and the corrugated pipe segment between the wave-wave top gapped 11, be out of shape required space to satisfy corrugated pipe segment its ripple joint when being compressed in radial direction, in the present embodiment, the wave crest of the export-oriented ripple of corrugated pipe segment contacts with the support ring internal face, when corrugated pipe segment was subjected to radial compression applied to trend towards being out of shape, support ring promptly played the rigid support effect to it.

Wave core body 12 is set in the inward wave cavity of corrugated pipe segment, between ripple chamber surface and the wave core body surface gapped 13, see Fig. 3, Fig. 4, to satisfy the needs of corrugated pipe segment requisite space when being stretched or be compressed distortion, the size in gap 13 is shared the required deformation space of extending amount according to this ripple joint and is determined, but in should satisfying simultaneously, value is subjected under the radial pressure to ripple, and just can be in regime of elastic deformation by the wave core body rigid support.The structure present specification of wave core body 12 provides two kinds and implements structure, is provided by Fig. 3, Fig. 4 respectively.In Fig. 3, wave core body is made of rigid body 14 and two elastic components 15, and two elastic components are located at respectively on the bi-side of rigid body, and elastic component plays initial supporting effect to interior to the wave-wave body, after elastic component was compressed, wave core body promptly played the rigid support effect to interior to the wave-wave body.In Fig. 4, wave core body is made of rigid body 16 and soft formation body 17, the soft formation body rigid body surface that is laid in, it is interior after the wave-wave body is being subjected to radial pressure to produce certain deformation, at first compress the soft formation body, after the soft formation body was compressed to a certain degree, wave core body both played the rigid support effect to interior to the wave-wave body.Wave core body is sectional making along the circumferential direction.

This shows, when support ring and wave core body play rigid support to corrugated pipe segment, corrugated pipe segment is at the active state that bears the next Cheng Yagang body of radial pressure situation member, improved its effect stability widely, guaranteed its operational reliability effectively, and can reduce the wall thickness of corrugated pipe segment, improve stress to influence that it caused; Because prefabricated gap when the penstock axial stretching, makes corrugated pipe segment still keep its intrinsic scalable performance between wave core body surface and inward wave cavity surface, makes this device possess reliable usability.

Embodiment 2, and its structure is provided by Fig. 5.In this example, the two ends of support ring 6 are free end, promptly are not connected with short tube, and two short tubes all can move axially with respect to support ring, to satisfy the axial stretching of penstock.In this example, the support ring internal face is established groove 18, and the bottom surface of the export-oriented wave-wave top contact groove of corrugated pipe segment is that free-ended support ring produces axial free slippage to prevent two ends.Other sees diagram.

Claims (6)

1, a kind of extension section for pressure steel pipeline device has two short tubes, is provided with corrugated pipe segment in the flexible gap between the two short tube interface end, and the two ends of described corrugated pipe segment are that sealing state is connected with the interface end of two short tubes respectively, it is characterized in that:

1) is provided with the support ring that described corrugated pipe segment is played the radial support effect, the interface end of described two short tubes and be located between the two short tube interface end in the flexible gap and be that the described corrugated pipe segment that sealing state is connected all is positioned at described support ring with two short tube interface end, short tube can produce with respect to this support ring and move axially, the export-oriented wave-wave top contact of corrugated pipe segment or trend towards contacting the internal face of support ring

2) be provided with wave core body in the inward wave cavity of described corrugated pipe segment, have one to satisfy the interior gap that only in regime of elastic deformation, produces distortion to the wave-wave body between the surface of described inward wave cavity and the wave core body surface.

2, according to the described extension section for pressure steel pipeline device of claim 11, it is characterized in that an end of described support ring (6) is connected with the short tube tube wall of this end, the other end of support ring is a free end.

3, according to the described extension section for pressure steel pipeline device of claim 1, it is characterized in that the two ends of described support ring (6) are free end, this support ring internal face is provided with groove (18), and the export-oriented wave-wave top of corrugated pipe segment contacts with groove floor.

4, according to claim 1 or 2 or 3 described extension section for pressure steel pipeline devices, it is characterized in that on the short tube interface end face of water intake end, being provided with wear-resistant ring (9), between the short tube interface end of the other end of this wear-resistant ring and waterexit end gapped (10), wear-resistant ring outer wall and corrugated pipe segment are interior between the wave-wave top gapped (11).

5, according to claim 1 or 2 or 3 or 4 described extension section for pressure steel pipeline devices, it is characterized in that described wave core body is made of rigid body (14) and two elastic components (15), two elastic components are located at respectively on the bi-side of rigid body.

6, according to claim 1 or 2 or 3 or 4 described extension section for pressure steel pipeline devices, it is characterized in that described wave core body is made of rigid body (16) and soft formation body (17), the soft formation body is laid on the rigid body surface.

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