CN202280993U - Novel three-dimensional straight pipe pressure balance type corrugated expansion joint - Google Patents

Abstract

The utility model provides a novel three-dimensional straight pipe pressure balanced corrugated expansion joint, which is provided with a first working bellows and a balanced bellows between the first flange and an end plate, and the second working bellows is arranged on the balanced bellows Inside; the first end pipe is fixedly connected to the inner end of the first flange, and an outer pipe is arranged outside the first end pipe; one end of the first working bellows is fixedly connected to the outer pipe, and the other end is fixedly connected to the first end pipe Above; the outer pipe is fixedly connected to the second end pipe through the concentric reducer, and the other end of the second end pipe is fixedly connected to the second flange; one end of the balance bellows is fixedly connected to the outer middle of the concentric reducer, and the other end is fixedly connected to the On the end plate; one end of the second working bellows arranged inside the balance bellows is also fixedly connected to the outer middle of the concentric reducer, and the other end is fixedly connected to the end plate. The working bellows of the utility model has a higher safety factor of the full external pressure structure, a more compact structure, and a more thorough blowing effect.

Description

New three-dimensional straight pipe pressure balanced corrugated expansion joint

technical field

The utility model relates to a pipeline spare part for conveying small particle solid medium or liquid and gas, in particular to a novel three-dimensional straight pipe pressure-balanced corrugated expansion joint.

Background technique

The traditional three-dimensional straight pipe pressure balance expansion joint is composed of two bellows bearing internal pressure and one bellow bearing external pressure, two end plates, and several tie rods. Thrust, its deficiencies are as follows:

(1) A group of working bellows is an internal pressure structure, and the rigidity of the product with limited wave number is relatively large;

(2) The purge position is unreasonable and the purge is not thorough;

(3) The product structure size is not compact enough.

Contents of the invention

The purpose of the utility model is to provide a new three-dimensional straight pipe pressure balanced bellows expansion joint with compact structure and full external pressure structure of the working bellows.

The technical solution for realizing the purpose of this utility model: a new type of three-dimensional straight pipe pressure balanced corrugated expansion joint, which includes a first flange and an end plate respectively connected to both ends of the large tie rod, between the first flange and the end plate A first working bellows and a balance bellows are provided, and the second working bellows is set inside the balance bellows; wherein, the inner end of the first flange is fixedly connected to the first end pipe, and the outer side of the first end pipe is provided with an outer tube; one end of the first working bellows is fixedly connected to the outer tube, and the other end is fixedly connected to the first end tube; the outer tube is fixedly connected to the second end tube through a concentric reducer, and the other end of the second end tube is fixedly connected to the second end tube. One end is fixedly connected to the second flange; one end of the balance bellows is fixedly connected to the outer middle of the concentric reducer, and the other end is fixedly connected to the end plate; the second working bellows arranged inside the balance bellows is also One end is fixedly connected to the outer middle of the concentric reducer, and the other end is fixedly connected to the end plate.

In the novel three-dimensional straight pipe pressure balanced bellows expansion joint described above, one end of the first working bellows is fixedly connected to the outer pipe through the first end ring, and the other end of the first working bellows is fixed through the second end ring. The end ring is fixedly connected with the first end pipe; that is, one end of the first working bellows is fixed on the first end ring, and the first end ring is fixed on one end of the outer pipe; the other end of the first working bellows is fixed on the second end On the ring, the second end ring is fixed to one end of the first end tube.

According to a novel three-dimensional straight pipe pressure-balanced bellows expansion joint as described above, the first working bellows includes a first connecting pipe, a first intermediate pipe and a second connecting pipe connected in sequence; Corrugated sections are provided on the second connecting pipe and the second connecting pipe, the first connecting pipe is fixedly connected to the outer pipe, and the second connecting pipe is fixedly connected to the first end pipe.

According to a novel three-dimensional straight pipe pressure-balanced bellows expansion joint as described above, the second working bellows includes a third connecting pipe, a second intermediate pipe and a fourth connecting pipe connected in sequence; in the third connecting pipe The fourth connecting pipe and the fourth connecting pipe are respectively provided with corrugated sections, the third connecting pipe is fixedly connected to the outer middle part of the concentric reducing pipe, and the fourth connecting pipe is fixedly connected to the end plate.

In the new three-dimensional straight pipe pressure balanced bellows expansion joint as described above, one end of the balanced bellows is fixedly connected to the outer middle of the concentric reducer through the fifth connecting pipe, and the other end of the balanced bellows is fixed through the sixth connecting pipe. The connecting pipe is fixedly connected with the end plate; that is, one end of the balance bellows is fixed on the fifth connecting pipe, and the fifth connecting pipe is fixed on the outer middle of the concentric reducer; the other end of the balance bellows is fixed on the sixth connecting pipe, The sixth connecting pipe is fixed on the end plate.

A new type of three-dimensional straight pipe pressure balanced bellows expansion joint as described above, which is equipped with end reinforcement rings at the joints between the fifth connecting pipe and the balanced bellows, and at the joints between the sixth connecting pipe and the balanced bellows ; A reinforcing ring is arranged between the corrugations of the corrugated section of the balance bellows.

A new three-dimensional straight pipe pressure-balanced corrugated expansion joint as described above, which is provided with a first purge flange connected to the purge device on the outside of the outer pipe; A second purge flange connected with the purge device is arranged on the fifth connecting pipe; several purge holes with plugs are arranged on the end plate.

As mentioned above, a new type of three-dimensional straight pipe pressure balanced bellows expansion joint, the outside of the balanced bellows is provided with an outer cover tube, and one end of the outer cover tube is fixed on the end plate.

In the novel three-dimensional straight pipe pressure-balanced corrugated expansion joint described above, the first flange and the end plate are respectively fixedly connected by large nuts and large tie rods, and a conical washer and a spherical washer are arranged therebetween.

The effect of the utility model is that the new three-dimensional straight pipe pressure balanced corrugated expansion joint described in the utility model is composed of two corrugated tubes bearing external pressure and one corrugated tube bearing internal pressure, two end plates and several pull rods , where the two bellows are connected in parallel, the principle of force and pressure balance of the bellows changes, and the pull rod bears the pressure thrust. Has the following advantages:

(1) The working bellows has a full external pressure structure, and the wave number is appropriately increased to reduce the stiffness;

(2) One end of the end plate adopts a wire plug, and the wire plug is opened when purging, so that the purging effect is more thorough;

(3) The structure is more compact, and the safety factor of the external pressure structure bellows is higher.

Description of drawings

Fig. 1 is a structural schematic diagram of a new three-dimensional straight pipe pressure-balanced bellows expansion joint described in the utility model.

In the figure: 1. Big tie rod; 2. Big nut; 3. First flange; 4. Spherical washer; 5. Cone washer; 6. First end pipe; 7. First end ring; 8. First connection Pipe; 9. First purge flange; 10. First working bellows; 11. First intermediate pipe; 12. Outer pipe; 13. Concentric reducer; 14. Second connecting pipe; 15. Second end Ring; 16. Fifth connecting pipe; 17. Second purge flange; 18. Third connecting pipe; 19. Second working bellows; 20. Second intermediate pipe; 21. Balance bellows; 22. Outer cover cylinder ; 23. The fourth connecting pipe; 24. The sixth connecting pipe; 25. End plate; 26. Plug; 27. The second end pipe; 28. Positioning rod; .End reinforcement ring.

Detailed ways

A new three-dimensional straight pipe pressure-balanced bellows expansion joint according to the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , the new three-dimensional straight pipe pressure-balanced corrugated expansion joint described in the utility model includes a first flange 3 and an end plate 25 respectively connected to two ends of a large tie rod 1 . A first working bellows 10 and a balance bellows 21 are arranged between the first flange 3 and the end plate 25 , and the second working bellows 19 is arranged inside the balance bellows 21 . The above-mentioned first flange 3 and the end plate 25 are respectively fixedly connected with the large tie rod 1 through the large nut 2, and a conical washer 5 and a spherical washer 4 are arranged therebetween.

A first end pipe 6 is welded to the inner end of the first flange 3 , and an outer pipe 12 is arranged outside the first end pipe 6 . The first working bellows 10 includes a first connecting pipe 8 , a first intermediate pipe 11 and a second connecting pipe 14 connected in sequence; the first connecting pipe 8 and the second connecting pipe 14 have corrugated sections respectively. One end of the first connecting pipe 8 of the first working bellows 10 is welded on the first end ring 7, and the first end ring 7 is welded on one end of the outer pipe 12; one end of the second connecting pipe 14 of the first working bellows 10 is welded on On the second end ring 15 , the second end ring 15 is fixed at one end of the first end pipe 6 .

The outer pipe 12 is fixedly connected to the second end pipe 27 through the concentric reducer 13, the large diameter end of the concentric reducer 13 is welded on one end of the outer pipe 12, and the small diameter end of the concentric reducer 13 is welded to the second end pipe 27 On one end of the second end pipe 27, the other end of the second end pipe 27 is welded to the inner end of the second flange 29.

One end of the balance bellows 21 is fixed on the fifth connecting pipe 16, and the fifth connecting pipe 16 is fixed on the outer middle of the concentric reducer 13; the other end of the balance bellows 21 is fixed on the sixth connecting pipe 24, and the sixth connection The tube 24 is fixed on the end plate 25 . In order to increase the strength, end reinforcing rings 31 are provided at the joints of the fifth connecting pipe 16 and the balance bellows 21, and at the joints of the sixth connecting pipe 24 and the balance bellows 21; A reinforcing ring 30 is arranged between them.

The second working bellows 19 is arranged inside the balance bellows 21 , which includes a third connecting pipe 18 , a second intermediate pipe 20 and a fourth connecting pipe 23 connected in sequence. The third connecting pipe 18 and the fourth connecting pipe 23 are respectively provided with corrugated sections, the third connecting pipe 18 is fixedly connected to the outer middle of the concentric reducer 13 , and the fourth connecting pipe 23 is fixedly connected to the end plate 25 .

In order to prevent the medium from entering the bellows to cause wear and erosion on the bellows, a first purge flange 9 and a second purge flange 17 connected to the purge device are provided. A first purge flange 9 is provided outside the outer pipe 12 ; a second purge flange 17 is provided on the fifth connecting pipe 16 . Two purge holes with plugs 26 are provided on the end plate 25 at a direction of 90 degrees to the second purge flange 17 . This purge hole is sealed with a plug 26 when the product is running, and the plug 26 is taken off when purging.

It is composed of fifth connecting pipe 16, concentric reducing pipe 13, balance bellows 21, sixth connecting pipe 24, third connecting pipe 18, second working bellows 19, fourth connecting pipe 23, and end plate 25. In one inner cavity, 12 holes are opened on the concentric reducer 13 at the corresponding position to allow the medium to circulate and the pressure to be transmitted to the end plate 25 .

In order to prevent the balance bellows from being bumped during transportation and installation, and to prevent dust on the outer surface of the bellows during work, an outer cover tube 22 is provided outside the balance bellows 21 , and one end of the cover tube 22 is fixed on the end plate 25 .

The pipe diameter of the above-mentioned first end pipe 6 is consistent with the pipe diameter of the pipeline to be installed, and plays the role of a connector and a pressure-bearing member, and can serve as a guide tube well, because the first end pipe can effectively Prevent the flowing medium from being in direct contact with the bellows, so it is very suitable for medium pipelines with small solid particles or dust.

The above-mentioned first flange 3 is connected with the conveying pipeline, and is generally designed according to the requirements of the pipeline. Bolt holes are drilled on the upper part of it, so that its strength is consistent with that of the end plate, and can withstand the internal pressure thrust generated by the bellows. Structural dimensions of small products.

The above-mentioned concentric reducer 13 can make the second end pipe 27 suitable for connecting pipes with different diameters, and can withstand various stresses caused by medium pressure.

The above-mentioned large tie rod 1 bears the pressure thrust generated by the bellows, and through the transmission of force by this rigid part, it can ensure that the product itself can absorb the pressure thrust generated by the bellows; The displacement of the tie rod when the product absorbs the lateral displacement; the main function of the spherical washer 4 is to be used in conjunction with the conical washer 5 for the displacement of the tie rod when the product absorbs the lateral displacement; the large nut 2 is used for the conical washer and the spherical surface The outer end of the gasket can cooperate with the large tie rod to absorb the pressure thrust generated by the bellows.

The expansion joints described in the utility model are installed in the pipeline at a certain distance as required. When the high-temperature medium circulates in the pipeline, the pipeline itself is heated and elongated, the first working bellows 10 is stretched, the second working bellows 19 and the balance The bellows 21 are equally elongated to absorb the axial displacement in the pipeline; at the same time, the first working bellows 10 can absorb the lateral displacement of the pipeline, and the pressure thrust generated by the bellows is absorbed by the large pull rod. In the utility model, the first working bellows and the second working bellows are designed as external pressure structures, and the balance bellows are designed as internal pressure structures, so the first working bellows and the second working bellows will not be exposed outside. The expansion joint described in the utility model also has a positioning rod 28, which can be used for temporary positioning of the product during the transportation and installation of the product to prevent the bellows from being deformed and twisted during transportation and installation. The positioning rod should be removed during work .

The expansion joint product of the utility model can simultaneously absorb the axial and lateral combined displacement in the pipeline, and can limit its displacement; the working bellows has a full external pressure structure, and the wave number is appropriately increased to reduce the product rigidity; the flow guide provided on the structure The inner diameter of the barrel is consistent with the inner diameter of the connected pipe, and the medium does not directly contact with the bellows, especially suitable for the transportation of solid particles and other media that will wash away the pipe. At the same time, it is equipped with a purging device. Open the plug, the blowing effect is more thorough, which can greatly prolong its service life.

Claims (10)

1. novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint; It comprises first flange (3) and the end plate (25) that is connected with big pull bar (1) two ends respectively; It is characterized in that: between first flange (3) and end plate (25), be provided with first work bellows (10) and the balance bellows (21), the second work bellows (19) is arranged on balance bellows (21) inside;

Wherein, be fixedly connected the first end pipe (6) at the inner end of first flange (3), the first end pipe (6) outside is provided with outer tube (12); One end of the described first work bellows (10) is fixedly connected on the outer tube (12), and the other end is fixedly connected on the first end pipe (6);

Outer tube (12) is fixedly connected with the second end pipe (27) through Concentric Reducers (13), and the other end of the second end pipe (27) is fixedly connected second flange (29); Described balance bellows (21) one ends are fixedly connected on the outer middle side part of Concentric Reducers (13), and the other end is fixedly connected on the end plate (25); Described be arranged on the second inner work bellows (19) of balance bellows (21) also an end be fixedly connected on the outer middle side part of Concentric Reducers (13), the other end is fixedly connected on the end plate (25).

2. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1; It is characterized in that: an end of the described first work bellows (10) is fixedly connected with outer tube (12) through first end ring (7), and the other end of the first work bellows (10) is fixedly connected with the first end pipe (6) through second end ring (15); Promptly an end of the first work bellows (10) is fixed on first end ring (7), and first end ring (7) is fixed on the end of outer tube (12); The other end of the first work bellows (10) is fixed on second end ring (15), and second end ring (15) is fixed on an end of the first end pipe (6).

3. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1 and 2 is characterized in that: the described first work bellows (10) comprises first connecting tube (8), first intervalve (11) and second connecting tube (14) that connects successively; On first connecting tube (8) and second connecting tube (14), have bellows segment respectively, first connecting tube (8) is fixedly connected with outer tube (12), and second connecting tube (14) is fixedly connected with the first end pipe (6).

4. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1 is characterized in that: the described second work bellows (19) comprises the 3rd connecting tube (18), second intervalve (20) and the 4th connecting tube (23) that connects successively; On the 3rd connecting tube (18) and the 4th connecting tube (23), have bellows segment respectively, the 3rd connecting tube (18) is fixedly connected with the outer middle side part of Concentric Reducers (13), and the 4th connecting tube (23) is fixedly connected with end plate (25).

5. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1; It is characterized in that: an end of described balance bellows (21) is fixedly connected with the outer middle side part of Concentric Reducers (13) through the 5th connecting tube (16), and the other end of balance bellows (21) is fixedly connected with end plate (25) through the 6th connecting tube (24); An end that is balance bellows (21) is fixed on the 5th connecting tube (16), and the 5th connecting tube (16) is fixed on the outer middle side part of Concentric Reducers (13); The other end of balance bellows (21) is fixed on the 6th connecting tube (24), and the 6th connecting tube (24) is fixed on the end plate (25).

6. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 5 is characterized in that: be provided with end stiffening ring (31) at described the 5th connecting tube (16) and balance bellows (21) joint, the 6th connecting tube (24) with balance bellows (21) joint; Between each ripple of the bellows segment of balance bellows (21), be provided with stiffening ring (30).

7. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 5 is characterized in that: the first purging flange (9) that is connected with blowing cleaner is arranged in described outer tube (12) arranged outside; The 5th connecting tube (16) that is connected with the outer middle side part of Concentric Reducers (13) is provided with the second purging flange (17) that is connected with blowing cleaner; End plate (25) is provided with several purge holes of band plug (26).

8. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1, it is characterized in that: described balance bellows (21) outside is provided with exterior cover pipeline (22), and exterior cover pipeline (22) one ends are fixed on the end plate (25).

9. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1; It is characterized in that: described first flange (3) is fixedly connected with big pull bar (1) by big nut (2) respectively with end plate (25), is provided with taper faced washer (5) and spherical washer (4) therebetween.

10. a kind of novel three-dimensional straight pipe pressure-equalizing formula corrugated expansion joint according to claim 1; It is characterized in that: described outer tube (12) is fixedly connected with the second end pipe (27) through Concentric Reducers (13); The larger diameter end that is Concentric Reducers (13) is fixedly connected on outer tube (12) one ends; The smaller diameter end of Concentric Reducers (13) is fixedly connected on the end of the second end pipe (27), and the other end of the second end pipe (27) is fixedly connected on the inner end of second flange (29).