CN111664306A

CN111664306A - Loose joint device for pipe without screw thread

Info

Publication number: CN111664306A
Application number: CN202010671452.8A
Authority: CN
Inventors: 刘小江; 刘赟
Original assignee: HUNAN CHUANGHUA LOW-CARBON ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
Current assignee: HUNAN CHUANGHUA LOW-CARBON ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-09-15

Abstract

The invention relates to a threadless pipeline loose joint device, which is used for connecting a first pipeline and a second pipeline and is characterized in that: including first locking flange, second locking flange, the sealed tube, locking screw and locking mechanism, accompany the sealed tube between first locking flange and second locking flange, locking mechanism includes locking piece and sealing member, first locking flange and first pipeline, all be equipped with locking piece between second locking flange and second pipeline, sealed tube and first locking flange, second locking flange compaction department all is equipped with the sealing member, locking screw runs through first locking flange and second locking flange in proper order, and be close to the locking to the sealed tube, impress sealed tube and first pipeline with the sealing member, in the gap of second pipeline. The invention has wide application field, saves working time and cost, is beneficial to the reutilization of the pipe, is convenient for the reconstruction and the maintenance of the pipe network, simultaneously enhances the sealing property and improves the pressure-resistant grade of the pipeline system.

Description

Loose joint device for pipe without screw thread

Technical Field

The invention relates to the field of machinery, in particular to a movable connection device for a threadless pipeline.

Background

In the pipeline engineering construction, different connection methods are selected according to the size and the material of the used pipe. The common steel pipe is connected with a flange plate through a threaded connection and a welding connection; the seamless steel pipe, the nonferrous metal and the stainless steel pipe are mostly welded and connected with a flange; the cast iron pipes are connected by socket joints, and a small number of cast iron pipes are connected by flanges; the plastic pipe is mostly connected by screw thread, adhesion, hot melting, etc. Small-size pipeline also has the adoption screw thread to connect, withstand voltage degree is not high can adopt the socket joint formula to connect, adopt to insert the space and fill in the rope made of hemp, cement if drain pipe and large-scale water pipe, or make plumbous sealed, the formula is detained to ditch groove pipe and is connected the general application in medium-sized pipe connection, if fire control pipe interconnect, this kind of connection needs the cooperation of pipeline support just can be sealed, its connection form is difficult to bear pipeline self weight, cause the pipeline to sink easily and can't be sealed, the use must be provided with the bearing support near its connected pipe thread, and the big mantle fiber of pipeline diameter is difficult more. Present connected mode practicality is single, sealed effect is not good, the resistance to pressure is poor, and is unfavorable for the maintenance of pipeline, and mounting tool is more in the use, carries inconveniently, and especially field work, under the condition of no power again, need indent equipment if slot pipe buckle connects, indent equipment needs the power, and the hot melt is connected and also needs the power, and these all can increase pipeline installation workman working strength.

Disclosure of Invention

Aiming at the problems, the invention provides a thread-free pipeline loose joint device.

The technical scheme adopted by the invention for solving the technical problems is as follows: a threadless pipeline loose joint device is used for connecting a first pipeline and a second pipeline, and is characterized in that: including first locking flange, second locking flange, sealed tube, locking screw and locking mechanism, accompany the sealed tube between first locking flange and second locking flange, locking mechanism includes locking piece and sealing member, all be equipped with locking piece between first locking flange and first pipeline, second locking flange and second pipeline, the sealed tube all is equipped with the sealing member with first locking flange, second locking flange compaction department, locking screw runs through first locking flange and second locking flange in proper order to be close to the locking to the sealed tube, impress the sealing member in the gap of sealed tube and first pipeline, second pipeline.

Preferably, the fastening piece is a fastening bushing or a fastening wedge, and the sealing piece is a sealing ring or a sealing filler.

Preferably, the first locking flange and the second locking flange are provided with a central through hole and a plurality of screw rod through holes, and the central through hole is provided with a taper or a plurality of wedge grooves.

Preferably, the plurality of wedge grooves are uniformly distributed on the hole wall around the central through hole, each wedge groove corresponds to one fastening wedge, a second screw rod is arranged on each fastening wedge, and the plurality of wedge grooves are connected with the corresponding fastening wedges through the second screw rods.

Preferably, the surface of the clamping wedge clinging to the surface of the first pipeline and the surface of the second pipeline are provided with sawtooth surfaces or thorn-shaped surfaces.

Preferably, the cross sections of the two ends of the sealing tube and the inner wall form a chamfer or the cross sections of the two ends of the sealing tube are provided with a recessed step larger than the inner diameter of the sealing tube, and the chamfer and the recessed step are used for placing a sealing element.

Preferably, the tightening bush and the seal ring are integrated, and the integrated sealing material is a soft sealing material, and may be soft copper metal, lead metal, pure aluminum, non-metal rubber, or plastic.

Preferably, the tightening bush is an open-type tightening bush.

Preferably, the locking screw can be provided with a nut, or the screw through-hole of the other locking flange can be provided with an internal thread corresponding to the thread of the locking screw.

Preferably, the first locking flange and the second locking flange may be diamond-shaped, triangular, square-shaped or circular.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention is not only suitable for metal materials, but also suitable for non-metal materials, and is also suitable for the connection of two pipelines made of different materials, no matter the small-sized pipeline, the medium-sized pipeline or the large-sized pipeline does not need wire twisting, groove pressing, hot melting or gluing, the small-sized pipeline can be installed only by a screwdriver, the medium-sized pipeline and the large-sized pipeline can be installed only by a spanner, pipe tongs are not needed, and pipeline installation equipment such as gantry tongs, a wire twisting plate, a groove pressing machine, an electric welding machine, a hot melting machine and the like are not needed;

2. the invention adopts a pressure-resistant sealing pipe to sleeve the connected pipeline, and then utilizes a locking flange to press a sealing element into a tiny gap between the sealing pipeline and the connected pipeline, the tiny gap has a great resistance effect on fluid leakage, because the tiny gap has a certain depth, the depth plays a role of pressure reduction, the sealing element is used for enhancing the sealing capability, and the total area of the sealing element in the stress direction can be basically supported by the locking flange, and the sealing element does not have any support in the stress direction of the existing flange pipeline connecting sealing gasket, but enhances the pressure-resistant strength by the effective width of the sealing gasket, and the total area of the pressure borne by the sealing gasket is reduced as much as possible by the extrusion of the flanges at the two sides of the sealing gasket to achieve the corresponding pressure-resistant height, and the pressure-resistant height is also related to the material selection of the sealing gasket. The width of the sealing gasket of the prior various loose joints and flange connections is generally larger than 0.5mm under the action of fluid pressure, the width of the sealing material of the invention under the action of fluid pressure is generally smaller than 0.2mm, and the sealing material of the invention has a certain depth because the connected pipeline is inserted into the sealing pipe and has the function of reducing pressure, the back of the prior sealing material under the action of the width of 0.5mm under the action of fluid pressure is generally unsupported, the stress direction is the peripheral direction of the pipe wall, and the stress direction of the sealing material of the invention is the locking flanges at two sides of the sealing material;

3. the invention has convenient construction, reduces the working strength of pipeline installation, saves working hours, saves material cost, is beneficial to the reutilization of pipes, is extremely convenient for the reconstruction and maintenance of pipe networks, enhances the sealing property and improves the pressure-resistant grade of a pipeline system;

4. the invention has wide application field, can be used in places related to pipeline application, is especially suitable for conveying dangerous fluid, such as natural gas pipeline connection, nuclear radiation fluid pipeline connection and the like, and replaces pipeline loose joint, round bend, tee joint, external screw joint, internal screw joint, pipe buckle, flange, compensator and the like. The pipeline joint has the advantages that the pipeline joint can well play a role in reducing the pipeline installation cost and the loose joint production cost, meanwhile, the leakage fault rate of pipeline installation is reduced, and the pipeline joint sealing strength and reliability are enhanced.

Drawings

FIG. 1 is a schematic cross-sectional view of a pipeline loose joint;

FIG. 2 is a schematic cross-sectional view of another pipeline loose joint;

FIG. 3 is a perspective view of a circular locking flange pipe loose joint embodiment;

FIG. 4 is a perspective view of a diamond locking flange pipe loose joint embodiment;

FIG. 5 is a cross-sectional view of an embodiment of a sealing tube;

FIG. 6 is a cross-sectional view of another embodiment of a gland;

FIG. 7 is a cross-sectional view of an embodiment of a tightening mechanism;

FIG. 8 is a schematic view of an embodiment of a split type tightening bushing;

FIG. 9 is a schematic cross-sectional view of a locking flange;

FIG. 10 is a cross-sectional view of an alternative locking flange;

FIG. 11 is a schematic cross-sectional view of a central through hole without taper;

FIG. 12 is a cross-sectional view of a locking flange with a central through hole that is not tapered;

FIG. 13 is a schematic view of a circular bend pipe loose joint embodiment;

FIG. 14 is a schematic view of a three-way pipe union embodiment;

wherein: 1. a sealing tube; 2. locking the screw rod; 3. a first locking flange; 4. a second locking flange; 5. a first conduit; 6. a second conduit; 7. chamfering; 8. a second screw; 9. tightening the bushing; 10. a screw through hole; 11. a seal ring; 12. a recessed step; 13. a central through hole; 14. an opening; 15. tightly fixing the thin edge end of the lining; 16. a conical surface; 17. a wedge groove; 18. a flange; 19. tightening the wedge; 20. circular bending; 21. a screw hole base; 22. a tee joint; 23. a third pipeline; 24. and (5) sealing and filling.

Detailed Description

The invention will now be described in detail with reference to fig. 1-14, wherein exemplary embodiments and descriptions of the invention are provided to illustrate the invention, but not to limit the invention.

The utility model provides a no screw thread pipeline loose joint device for connect first pipeline 5 and second pipeline 6, its characterized in that: including first locking flange 3, second locking flange 4, sealed tube 1, locking screw 2 and locking mechanism, accompany sealed tube 1 between first locking flange 3 and second locking flange 4, locking mechanism includes locking piece and sealing member, first locking flange 3 all is equipped with locking piece with first pipeline 5, second locking flange 4 and second pipeline 6 within a definite time, sealed tube 1 all is equipped with the sealing member with first locking flange 3, second locking flange 4 compaction department, locking screw 2 runs through first locking flange 3 and second locking flange 4 in proper order to be close to locking to sealed tube 1, impress the sealing member in the gap of sealed tube 1 and first pipeline 5, second pipeline 6.

The tightening piece is a tightening bushing 9 or a tightening wedge 19, and the sealing piece is a sealing ring 11 or a sealing packing 24.

The first locking flange 3 and the second locking flange 4 are provided with a central through hole 13 and a plurality of screw rod through holes 10, and the central through hole 13 is provided with a taper or a plurality of wedge grooves 17.

The plurality of wedge grooves 17 are uniformly distributed on the peripheral hole wall of the central through hole 13, each wedge groove 17 corresponds to one fastening wedge 19, the fastening wedge 19 is provided with a second screw 8, and the plurality of wedge grooves 17 are connected with the corresponding fastening wedge 19 through the second screw 8.

The surfaces of the fastening wedge 19 clinging to the surfaces of the first pipeline 5 and the second pipeline 6 are provided with sawtooth surfaces or thorn-shaped surfaces.

The cross sections of the two ends of the sealing pipe 1 and the inner wall form a chamfer or the cross sections of the two ends of the sealing pipe are provided with a concave step 12 larger than the inner diameter of the pipe, and the chamfer and the concave step 12 are used for placing a sealing element.

The fastening bush 9 and the sealing ring 11 are integrated into a whole, and the integrated sealing material is soft sealing material which can be soft copper metal, lead metal, pure aluminum, non-metal rubber and plastic.

The tightening bush 9 is an open type tightening bush.

The locking screw 2 can be provided with a nut or the screw through-hole 10 of the other locking flange can be provided with an internal thread corresponding to the thread of the locking screw 2.

The first locking flange 3 and the second locking flange 4 can be diamond-shaped, triangular, square or circular.

An extrusion gasket can be arranged between the sealing pipe 1 and the locking flange.

The device is suitable for a round bend 20 and a tee joint 22, and the round bend 20 and the tee joint 22 are provided with screw hole bases 21 or lugs for connecting locking flanges with screw rods.

The edge of the central through hole 13 can be provided with a flange 18.

Referring to fig. 1, in a first embodiment of the present invention, a threadless pipe loose joint device is used for a first pipe 5 and a second pipe 6, and is characterized in that: including first locking flange 3, second locking flange 4, sealed tube 1, locking screw 2 and locking mechanism, accompany sealed tube 1 between first locking flange 3 and second locking flange 4, locking screw 2 runs through first locking flange 3 and second locking flange 4 in proper order, locking mechanism includes locking piece and sealing member, all be equipped with locking piece between first locking flange 3 and first pipeline 5, second locking flange 4 and second pipeline 6, sealed tube 1 all is equipped with the sealing member with first locking flange 3, second locking flange 4 compaction department.

Wherein the tightening piece is a tightening bush 9, the sealing element is a sealing ring 11, the cross sections of the two ends of the sealing tube 1 and the inner wall form a chamfer 7, and the sealing ring 11 is placed in the chamfer 7.

Referring to fig. 2, in the second embodiment of the present invention, a flange 18 is disposed at the edge of the central through hole 13, stepped recessed steps 12 larger than the inner diameter of the pipe are disposed at the cross sections of both ends of the sealing pipe 1, a sealing filler 24 is disposed in the recessed steps 12, the first locking flange 3 and the second locking flange 4 are moved toward the sealing pipe 1 by the locking screw 2, the sealing filler 24 is pressed into the recessed steps 12 of the sealing pipe 1 and the pipe to be connected, and the sealing filler 24 is tightly attached to the outer walls of the first locking flange 3 and the second locking flange 4, so that the sealing function of pressing and sealing can be well performed, and the first pipe 5 and the second pipe 6 can slide left and right in the sealing pipe, and can be used as a pipe compensator in the case that the outer wall surface of the pipe is not very rough and the pressure is not very large. If the pressure of the fluid in the pipeline is high, a very smooth outer wall sleeve can be sleeved on the outer wall of the section of the first pipeline 5 and the second pipeline 6 extending into the sealing pipe 1, the smooth outer wall sleeve and the connected pipeline are compacted by a sealing device, a fastening piece is not arranged between the outer wall sleeve and the first locking flange 3 and the second locking flange 4, so that the first pipeline 5 and the second pipeline 6 can slide in the sealing pipe 1, thereby realizing the function of a compensator, the connected pipeline can be provided with a clamping device outside the respective locking flange and is connected together by a telescopic U-shaped steel plate to prevent the pipeline from being incapable of sealing caused by over-telescopic, and the clamping device is not drawn in the embodiment drawing.

Fig. 3 is a perspective view of an embodiment of a circular locking flange pipe loose joint device, wherein the first locking flange 3 and the second locking flange 4 are both circular and the fastening piece is a fastening bush 9.

Fig. 4 is a perspective view of another rhombic locking flange embodiment, wherein the first locking flange 3 and the second locking flange 4 are both rhombic, which is suitable for the connection of small pipes, wherein either one of the first locking flange 3 and the second locking flange 4 is provided with threaded screw through holes 10, and only two locking screws 2 are needed for nuts, and the first locking flange 3 and the second locking flange 4 can be screwed by a screwdriver, so that the compaction seal ring 11 plays a role in sealing connection.

Referring to fig. 5, a cross-sectional view of an embodiment of the sealing tube is shown, wherein flanges are disposed at two ends of the sealing tube 1, and the flanges at the two ends are respectively used for connecting the first locking flange 3 and the second locking flange 4. The cross sections of the two ends of the sealing pipe 1 are provided with a step-shaped concave step 12, the inner diameter of the concave step 12 is larger than the inner diameter of the pipeline of the sealing pipe 1, and a sealing ring 11 or a sealing filler 24 is placed in the concave step 12 and used for fastening the sealing pipe 1, the first locking flange 3 and the second locking flange 4.

Referring to fig. 6, a cross-sectional view of another embodiment of the sealing tube 1 is shown, wherein the cross-section of both ends of the sealing tube and the inner wall of the sealing tube form a chamfer 7 for receiving a sealing ring 11 or a sealing packing 24.

Referring to fig. 7, which is a cross-sectional view of a tightening mechanism, the tightening mechanism is designed by integrating a tightening bush 9 and a seal ring 11, the tightening bush 9 and the sealing ring 11 are made of soft materials, the sealing ring 11 is close to the sealing pipe 1 and is arranged in the chamfer 9 or the concave ladder 12 to realize the sealing of the sealing pipe 1 with the first pipeline 5 and the second pipeline 6, two locking bushings 9 are arranged and are respectively plugged into gaps formed by the first locking flange 3, the first pipeline 5, the second locking flange 4 and the second pipeline 6 from a thin end, the locking screw 2 can enable the first locking flange 3 and the second locking flange 4 to be continuously close to the sealing pipe 1 by being screwed by matched nuts, the gap is continuously filled and plugged by the fastening bush 9, and the first pipeline 5 and the second pipeline 6 are fastened together, and the first locking flange 3 and the second locking flange 4 are also established.

Referring to fig. 8, the opening type tightening bushing is provided with an opening 14 and a tightening bushing thin edge end 15, when the locking screw 2 is screwed, the width of the opening 14 of the opening type tightening bushing becomes narrower and narrower, and finally the first pipeline 5 and the second pipeline 6 are locked, and the first locking flange 3 and the second locking flange 4 are also designed.

Referring to fig. 9, the central through holes 13 of the first locking flange and the second locking flange are tapered.

Referring to fig. 10-11, the center hole of the locking flange is provided with a taper and a wedge groove.

Referring to fig. 12, a cross-sectional view of a locking flange without a tapered center hole is shown, a wedge groove 17 is formed in the locking flange, the wedge groove 17 is used for accommodating a fastening wedge 19, saw teeth are formed on the surfaces, close to the first pipeline 5 and the second pipeline 6, of the fastening wedge 19, a second screw 8 capable of adjusting the fastening tightness is arranged on the fastening wedge 19, when the second screw 8 is screwed, the fastening wedge 19 is continuously extruded into the wedge groove 17, and the saw teeth can clamp the first pipeline 5 and the second pipeline 6 to play a fastening role, and the embodiment is suitable for large-scale pipeline loose joint.

Referring to fig. 13 and 14, which are examples of the circular bend and the tee joint, respectively, the circular bend 20 and the tee joint 22 are respectively provided with a screw hole of the locking screw 2 and a corresponding screw hole base 21 or lug, so that when the locking screw 2 passes through the first locking flange 3 and is screwed into the screw hole corresponding to the screw hole base, the first locking flange 3 can extrude the sealing member into the small gap formed by the sealing pipe 1 and the first pipeline 5, the second pipeline 6, and the third pipeline 23 to achieve efficient sealing.

The invention can be used for connecting various pipelines, does not need a twisted wire for a metal pipeline, does not need hot melting connection for a plastic non-metal pipeline, does not need coating adhesive for sealing connection, is suitable for connecting pipelines with various sizes and sizes made of various materials, can also be suitable for connecting pipelines made of two different materials, is convenient for construction, greatly reduces the working strength of pipeline installation, saves working hours, saves material cost, is beneficial to recycling of the pipes, is very convenient for modifying and maintaining a pipe network, simultaneously enhances the sealing property and improves the pressure-resistant grade of a pipeline system.

In the implementation process, no matter a rhombic locking flange is adopted, or a triangular, square or circular locking flange is adopted, the central through hole 13 of a connected pipeline has certain taper, or the hole wall of the central through hole 13 without the taper is required to be provided with a wedge groove 17 for placing a locking wedge 19, the taper of the central through hole of the locking flange is used for conveniently installing a locking bushing 9 and locking the connected pipeline, the large diameter end of the central through hole 13 faces to the sealing pipe 1, the locking flanges at two ends of the sealing pipe 1 are screwed by the locking screw rods 2, the layout of the screw rod through holes 10 for locking is required to be symmetrical, and the number of the screw rod through holes 10 is determined according to the diameter of the pipeline and the internal pressure of the pipeline. When the diameter of the pipeline is larger, the number of the screw through holes 10 is correspondingly larger; when the pressure of fluid in the pipeline is higher, the used locking screw rods 2 are thicker, the number of the locking screw rods can be correspondingly increased, and then the screw rod through holes 10 are also increased; one locking flange can be used as a screw rod through hole, and the screw rod through hole corresponding to the other locking flange is an internal thread hole, so that the configuration of corresponding nuts is reduced.

A sealing pipe 1 is sleeved between a first locking flange 3 and a second locking flange 4, a first pipeline 5 and a second pipeline 6 are arranged in the sealing pipe 1, a gap is formed between the sealing pipe 1 and the first pipeline 5 and the second pipeline 6, the first locking flange 3 and the second locking flange 4 are fastened through locking screws 2, the number and the thickness of the locking screws 2 are matched with the corresponding pipeline diameter and the fluid pressure, a locking bush 9 is arranged in the gap between the first locking flange 3, the second locking flange 4 and the connected pipeline and is used for tightly hooping the connected pipeline and setting the locking flanges, when the locking flanges are screwed by nuts of the locking screws 2, the first locking flange 3 and the second locking flange 4 at two ends of the sealing pipe 1 are close to the sealing pipe 1, and meanwhile, the locking bush 9 or the locking wedge 19 can continuously extrude and expand the gap between the locking flanges and the connected pipe, the tighter the nut is screwed and the more the nut is squeezed, the first locking flange 3 prevents the entire threadless union from moving towards the second connecting pipe 6, and the second locking flange 4 prevents the threadless union from moving towards the first pipe 5, thus forming a very stable, immovable threadless union. The sealing rings 11 or the sealing packing 24 at the two ends of the sealing pipe 1 can be compacted by the tightening bush 9 or the tightening wedge 19 and the locking flange in the locking process, so as to play a strong sealing role, when the tightening bush 9 and the sealing rings 11 are integrally designed, the sealing ring 11 and the fastening lining 9 are made of soft materials, if a harder open type fastening lining is adopted, when the locking screw 2 is screwed, the width of the opening 14 is narrower and narrower, the edge end 15 of the locking bush is gradually closed, finally the connected pipeline is locked, meanwhile, a locking flange is also established, if a harder opening type tightening bush is adopted, an extrusion gasket can be additionally arranged between the tightening bush 9 and the sealing ring 11 or the sealing filler 24, the method can prevent the situation that the sealing ring 11 or the sealing filler 24 is not extruded and supported to cause poor sealing effect under the condition that the opening 14 of the opening type fastening bushing is not closed.

The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.

Claims

1. A threadless pipeline loose joint device for connecting a first pipeline (5) and a second pipeline (6), characterized in that: including first locking flange (3), second locking flange (4), sealed tube (1), locking screw (2) and locking mechanism, accompany sealed tube (1) between first locking flange (3) and second locking flange (4), locking mechanism includes locking piece and sealing member, all be equipped with locking piece between first locking flange (3) and first pipeline (5), second locking flange (4) and second pipeline (6), sealed tube (1) and first locking flange (3), second locking flange (4) compaction department all are equipped with the sealing member, locking screw (2) run through first locking flange (3) and second locking flange (4) in proper order to be close to the locking to sealed tube (1), impress the sealing member in the gap of sealed tube (1) and first pipeline (5), second pipeline (6).

2. The threadless pipe loose joint device of claim 1, wherein: the tightening piece is a tightening bushing (9) or a tightening wedge (19), and the sealing piece is a sealing ring (11) or a sealing packing (24).

3. The threadless pipe loose joint device of claim 1, wherein: the first locking flange (3) and the second locking flange (4) are provided with a central through hole (13) and a plurality of screw rod through holes (10), and the central through hole (13) is provided with a taper or a plurality of wedge grooves (17).

4. The threadless pipe loose joint device of claim 3, wherein: the wedge-shaped clamping device is characterized in that the wedge grooves (17) are uniformly distributed on the peripheral hole wall of the central through hole (13), each wedge groove (17) corresponds to one fastening wedge (19), a second screw (8) is arranged on each fastening wedge (19), and the wedge grooves (17) are connected with the corresponding fastening wedges (19) through the second screws (8).

5. The threadless pipe loose joint device of claim 2, wherein: the surfaces of the fastening wedge (19) clinging to the surfaces of the first pipeline (5) and the second pipeline (6) are provided with sawtooth surfaces or thorn-shaped surfaces.

6. The threadless pipe loose joint device of claim 1, wherein: the cross sections of the two ends of the sealing pipe (1) and the inner wall form a chamfer or the cross sections of the two ends of the sealing pipe are provided with a recessed step (12) which is larger than the inner diameter of the pipe, and the chamfer and the recessed step (12) are used for placing a sealing element.

7. The threadless pipe loose joint device of claim 2, wherein: the fastening bush (9) and the sealing ring (11) are integrated into a whole, and the integrated sealing material is soft sealing material which can be soft copper metal, lead metal, pure aluminum, non-metal rubber and plastic.

8. The threadless pipe loose joint device of claim 2, wherein: the tightening bush (9) is an open type tightening bush.

9. The threadless pipe loose joint device of claim 1, wherein: the locking screw (2) can be provided with a nut, or the screw through hole (10) of the other locking flange is provided with an internal thread corresponding to the thread of the locking screw (2).

10. The threadless pipe loose joint device of claim 1, wherein: the first locking flange (3) and the second locking flange (4) can be in a diamond shape, a triangular shape, a square shape or a circular shape.