CN212319097U

CN212319097U - Groove soft joint

Info

Publication number: CN212319097U
Application number: CN202020831093.3U
Authority: CN
Inventors: 王晓光
Original assignee: Beijing Pioneer Pipeline Equipment Co ltd
Current assignee: Beijing Pioneer Pipeline Equipment Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-01-08
Anticipated expiration: 2030-05-18

Abstract

The utility model discloses a groove soft joint, which comprises a groove joint used for being connected with a groove provided with a groove on the outer side, and comprises a soft connecting pipe, wherein the end part of the soft connecting pipe is fixedly provided with a shaping frame, the outer side of the shaping frame is sleeved with a connecting piece for connecting the soft connecting pipe with the groove joint, and the connecting piece is tightly connected with a sealing piece for tightly connecting the groove joint with the outer side surface of the soft connecting pipe; the connecting piece comprises a connecting ring, an inner limiting ring is fixedly arranged at one end of the connecting ring, which is connected with the flexible connecting pipe, the inner limiting ring is partially overlapped with the projection of the shaping frame along the central line direction of the flexible connecting pipe, and the inner limiting ring limits the connecting piece and the flexible connecting pipe to move away from each other and separate from each other; an outer limiting ring is fixedly arranged at one end of the connecting ring connected with the groove joint, and the inner side of the outer limiting ring can be inserted into the groove of the groove joint. The utility model discloses have the effect of carrying out the flexible coupling between the slot pipeline fast.

Description

Groove soft joint

Technical Field

The utility model belongs to the technical field of the technique of pipeline flexonics and specifically relates to a soft joint of slot is related to.

Background

The pipe groove connection is a sleeve type quick connection which is formed by machining a special channeling machine into an annular groove at the joint part of the pipe, sleeving a rubber sealing ring on the adjacent pipe end and assembling a split type clamp piece, a C-shaped rubber sealing ring, a fastener and the like. The groove connection has the advantages of quick, simple, safe, reliable, economic, free of electric welding, free of pollution and the like, labor and labor cost are saved, noise of the pipeline, vibration propagation, expansion with heat and contraction with cold can be absorbed in operation, the pipeline is convenient to maintain, and the installation place is not limited. The groove type pipeline is generally suitable for pipeline engineering of water supply and drainage, fire fighting, air conditioning and the like in life and production at the temperature of not more than 80 ℃.

The patent of the Chinese utility model with the publication number of CN204312865U discloses a groove pipe clamp, which comprises two clamp rings, a bolt and a nut, wherein the clamp rings form semicircular notches, and the notches of the two clamp rings are oppositely spliced to form a circular channel; two ends of the clamp ring body are respectively provided with a lug, and the lugs corresponding to the two clamp rings are reserved with through holes; the lugs at the two sides of the two clamping rings correspond to each other respectively, and the two clamping rings are fixedly connected by screwing the nuts after the bolts penetrate through the through holes of the corresponding lugs; the two sides of the clamp ring lug are outwards convex, and the transition part of the lug and the body is inwards inclined. The groove pipeline hoop of the scheme can be applied to connection of groove pipelines, rolling groove pipelines and grooving pipelines.

Chinese utility model patent with grant bulletin number CN210424101U discloses a flexible connection pipeline, including first pipeline and second pipeline, first pipeline and second pipeline pass through flexible connection spare and connect, and flexible connection spare includes corrugated aluminum alloy pipe, and corrugated aluminum alloy pipe's both ends are provided with the ring flange respectively to through the ring flange respectively with first pipeline and second pipeline fixed connection, corrugated aluminum alloy pipe's both ends are provided with the pipe of pegging graft respectively, and two pipe of pegging graft insert respectively in first pipeline and the second pipeline, flexible connection pipeline's advantage lies in having good sealing performance.

The above prior art solutions have the following drawbacks: the existing groove pipeline flexible connection mode is generally that a flange joint is fixed on a pipeline, then flexible connection between the pipelines is realized through flanges by using a hose with flange joints at two ends, and the connection operation procedures are multiple and the connection operation time is long.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a soft joint of slot, it has the effect of carrying out the flexible coupling between the slot pipeline fast.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a groove soft joint is used for being connected with a groove joint with a groove arranged on the outer side, and comprises a soft connecting pipe, wherein a rigid shaping frame is fixedly arranged at the end part of the soft connecting pipe, a connecting piece for connecting the soft connecting pipe with the groove joint is sleeved on the outer side of the shaping frame, and a sealing piece for tightly connecting the groove joint with the outer side surface of the soft connecting pipe is tightly connected to the connecting piece in a compression mode;

the connecting piece comprises a connecting ring, an inner limiting ring is fixedly arranged at one end of the connecting ring, which is connected with the flexible connecting pipe, the inner limiting ring can be partially overlapped with the projection of the shaping frame along the central line direction of the flexible connecting pipe, and the inner limiting ring limits the connecting piece and the flexible connecting pipe to move away from each other and separate from each other;

an outer limiting ring is fixedly arranged at one end of the connecting ring connected with the groove joint, and the inner side of the outer limiting ring can be inserted into the groove of the groove joint;

the sealing member is including being used for the sealed interior sealing ring between stock frame and the connecting piece, the sealing member is including being used for the groove joint surface and the connecting piece between the external seal ring.

By adopting the technical scheme, after the shaping frame is aligned with the groove joint, the connecting piece is sleeved outside the flexible connecting pipe and the groove joint, the ports of the shaping frame and the groove joint are positioned between the inner limiting ring and the outer limiting ring, the outer limiting ring is positioned in the groove of the groove joint, the inner limiting ring is positioned on one side of the shaping frame, which is back to the groove joint, to prevent the groove joint and the shaping frame from moving back and forth, the flexible connecting pipe can bear a certain pressure effect, the sealing piece is used for keeping the sealing between the flexible connecting pipe and the groove joint and preventing the outflow seepage of the inner cavity of the groove flexible joint, the other end of the groove joint is connected with the joints of other pipelines or valves and is used for flexible connection between the pipelines and the valves, the flexible connecting piece is suitable for the bending connection part of the pipelines and is convenient to adjust and install, and the connection part of the valves or pump ports can absorb the vibration in the use, the stability of the pipe connection is improved, and meanwhile, the installation and construction of the groove soft joint are convenient and the cost is low.

The utility model discloses further set up to: and one ends of the inner sealing ring and the outer sealing ring which are opposite are tightly connected.

By adopting the technical scheme, the sealing connection at the opposite end of the inner sealing ring and the outer sealing ring can prevent the fluid in the inner cavity of the groove soft joint from entering the gap between the inner sealing ring and the outer sealing ring, entering the gap between the sealing element and the connecting piece and then seeping out, and the good sealing effect of the sealing element is ensured.

The utility model discloses further set up to: the outer side surface of the outer sealing ring is in contact with the inner side surface of the connecting ring, the surface of the outer sealing ring, which is opposite to the inner sealing ring, is in contact with the surface of the outer limiting ring, which faces the inner limiting ring, and the inner side surface of the outer sealing ring is in contact with the outer surface of the groove joint;

and the surface of the outer sealing ring facing the inner sealing ring is provided with a pressing groove.

By adopting the technical scheme, when fluid with pressure flows in the groove soft joint, the fluid with pressure can enter the pressing groove, the fluid with pressure exerts acting force on the side face of the pressing groove, along with the increase of the pressure in the fluid, the pressure action between the outer sealing ring and the outer side face of the groove joint is larger, and the sealing performance of the outer sealing ring between the groove joint and the connecting piece is higher.

The utility model discloses further set up to: the flexible connecting pipe comprises a tubular flexible supporting layer, the flexible connecting pipe comprises a sealing layer positioned on the inner side of the flexible supporting layer, and the sealing layer blocks fluid in the inner cavity of the flexible connecting pipe from flowing out.

Through adopting above-mentioned technical scheme, the pressure fluid in the soft joint of slot exerts pressure to the closing layer, and the pressure that the closing layer bore transmits flexible supporting layer, and flexible supporting layer is hose connection's support skeleton, keeps the stability of closing layer, and the closing layer has good compactedness, keeps the flexible connecting pipe fluid to flow at its inner chamber.

The utility model discloses further set up to: the flexible connecting pipe comprises a protective layer positioned on the outer side of the flexible supporting layer.

By adopting the technical scheme, the protective layer can protect the outer side of the flexible supporting layer, and the erosion abrasion of external substances to the flexible supporting layer when the groove soft joint is used is reduced.

The utility model discloses further set up to: the shaping frame is positioned in the flexible supporting layer.

By adopting the technical scheme, the shaping frame positioned in the flexible supporting layer can avoid contacting with fluid in the groove soft joint while keeping the connection of the soft connecting pipe and the connecting piece, and the corrosion of the shaping frame is slowed down.

The utility model discloses further set up to: the shaping frame is a circular ring connected with the flexible connecting pipe, and the protective layer, the closed layer, the inner sealing ring and the outer sealing ring are integrally formed.

Through adopting above-mentioned technical scheme, annular design frame stable in structure, the atress is even, inoxidizing coating, seal coat, inner seal ring and external seal ring integrated into one piece, and the leakproofness of sealing member is higher, reduces the manufacturing cost that the soft joint of slot, the batch production of the soft joint of slot of being convenient for.

The utility model discloses further set up to: the both ends of flexible coupling pipe all set firmly the design frame, the both ends of flexible coupling pipe all are provided with connecting piece and sealing member.

Through adopting above-mentioned technical scheme, the both ends of soft connecting pipe can realize being connected with two groove joint fast through design frame, connecting piece and sealing member.

The utility model discloses further set up to: the soft connecting pipe is a similar spherical pipe with the inner diameter gradually reduced from the middle to the two ends along the direction of the central line of the soft connecting pipe.

By adopting the technical scheme, the structure of the flexible connecting pipe can keep better stability when the axes of the two ports of the flexible connecting pipe are mutually staggered or form a certain included angle.

The utility model discloses further set up to: the connecting piece is an existing pipe clamp.

Through adopting above-mentioned technical scheme, use current pipe strap as the connecting piece, reduce the cost of slot soft joint, the workman can directly carry out the installation operation and need not carry out other training.

To sum up, the utility model discloses a following at least one beneficial effect:

1. after the shaping frame is aligned with the groove joint, the connecting piece is sleeved outside the flexible connecting pipe and the groove joint, the ports of the shaping frame and the groove joint are positioned between the inner limiting ring and the outer limiting ring, the outer limiting ring is positioned in the groove of the groove joint, the inner limiting ring is positioned on one side of the shaping frame back to the groove joint to prevent the groove joint and the shaping frame from moving back and forth, the flexible connecting pipe can bear certain pressure, the sealing piece is used for keeping the sealing between the flexible connecting pipe and the groove joint to prevent the outflow and seepage of the inner cavity of the groove flexible joint, the other end of the groove joint is connected with the joints of other pipelines or valves to be used for flexible connection between the pipelines and the valves, the flexible connecting piece is suitable for the bending connection of the pipelines to facilitate adjustment and installation, the connection part of the valves or the pump ports can absorb the vibration in the use process of the valves or the pump ports, absorb the vibration energy in, meanwhile, the installation and construction of the groove soft joint are convenient, and the cost is low;

2. when fluid with pressure flows through the groove soft joint, the fluid with pressure can enter the compaction groove, the fluid with pressure exerts acting force on the side face of the compaction groove, and along with the increase of the pressure in the fluid, the pressure action between the outer sealing ring and the outer side face of the groove joint is larger, and the sealing performance of the outer sealing ring between the groove joint and the connecting piece is higher;

3. the annular shaping frame is stable in structure and even in stress, the protective layer, the sealing layer, the inner sealing ring and the outer sealing ring are integrally formed, the sealing performance of the sealing element is high, the production cost of the groove soft joint is reduced, and batch production of the groove soft joint is facilitated.

Drawings

FIG. 1 is a schematic view of an overall half-section structure of the first embodiment;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a schematic partial sectional view showing the connection between the sealing member and the connecting member according to the third embodiment.

In the figure, 1, a groove joint; 2. a flexible connecting pipe; 21. a flexible support layer; 22. a sealing layer; 23. a protective layer; 3. shaping frames; 4. a connecting member; 41. a connecting ring; 42. an inner limiting ring; 43. an outer limit ring; 5. a seal member; 51. an inner seal ring; 52. an outer seal ring; 53. and pressing the groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example one

Referring to fig. 1 and 2, for the utility model discloses a soft joint of slot for be provided with the groove of slot with the outside and connect between 1, the slot connects 1 and uses the joint behind the slot machine preparation slot for the port outside in a pipeline, and the slot has one end distance apart from the port that the slot connects 1.

The grooved flexible joint comprises a flexible connecting tube 2, the flexible connecting tube 2 comprises a tubular flexible supporting layer 21, the flexible supporting layer 21 is a cord fabric in the embodiment, the cord fabric is a framework material of a tire casing, and other flexible and tensile materials such as a steel wire mesh can be adopted in other embodiments. The flexible connecting tube 2 comprises a sealing layer 22 located inside the flexible supporting layer 21, the sealing layer 22 is a rubber layer in this embodiment, and may be other flexible and dense layer bodies in other embodiments, and the sealing layer 22 blocks the fluid in the inner cavity of the flexible connecting tube 2 from flowing out.

The pressure fluid in the groove soft joint exerts pressure on the sealing layer 22, the pressure born by the sealing layer 22 is transmitted to the flexible supporting layer 21, the flexible supporting layer 21 is a supporting framework of the soft connecting pipe, the stability of the sealing layer 22 is kept, the sealing layer 22 has good compactness, and the fluid of the soft connecting pipe 2 is kept to flow in the inner cavity of the sealing layer.

The flexible connecting pipe 2 comprises a protective layer 23 positioned on the outer side of the flexible supporting layer 21, the protective layer 23 is a rubber layer in the embodiment, and the protective layer 23 can protect the outer side of the flexible supporting layer 21 and reduce erosion and abrasion of foreign matters on the flexible supporting layer 21 when the groove flexible joint is used.

The flexible connecting pipe 2 comprises a similar spherical pipe with the middle part having the same wall thickness and the inner diameter gradually decreasing from the middle part to the two ends along the central line direction of the flexible connecting pipe, and the flexible connecting pipe 2 comprises end special pipes with the same inner diameter at the two ends of the similar spherical pipe. The flexible connecting pipe 2 can keep better stability when the axes of the two ports of the flexible connecting pipe 2 are mutually staggered or form a certain included angle.

Two tip of soft connecting pipe 2 all set firmly rigid design frame 3, design frame 3 is the ring of being connected with soft connecting pipe 2, and design frame 3 is located flexible supporting layer 21, and design frame 3 is located two end abnormal shape tube portion of soft connecting pipe 2. The shaping frame 3 in the flexible supporting layer 21 can avoid contacting with fluid in the groove soft joint while keeping the connection of the soft connecting pipe 2 and the connecting piece 4, and the corrosion of the shaping frame 3 is slowed down.

The cover is equipped with connecting piece 4 of connecting soft connecting pipe 2 and groove joint 1 in 3 outside of stock frame, connecting piece 4 includes go-between 41, go-between 41 is the ring, go-between 41 has set firmly interior spacing ring 42 with the one end that soft connecting pipe 2 is connected, the internal diameter of interior spacing ring 42 reduces along keeping away from go-between 41 direction gradually, the wall thickness of interior spacing ring 42 is the same, the internal diameter of interior spacing ring 42 is the fixed ring of internal diameter along the one end of keeping away from go-between 41, interior spacing ring 42 and go-between 41 integrated into one piece, interior spacing ring 42 can partially coincide along the projection of soft connecting pipe 2 central line direction with stock frame 3, interior spacing ring 42 restriction connecting piece 4 and the separation of moving back to back of soft connecting pipe 2.

An outer limiting ring 43 is fixedly arranged at one end of the connecting ring 41 connected with the groove joint 1, the inner diameter of the outer limiting ring 43 is gradually reduced along the direction away from the connecting ring 41, the wall thickness of the outer limiting ring 43 is the same, the outer limiting ring 43 and the connecting ring 41 are integrally formed, the inner diameter of the outer limiting ring 43 is a circular ring with fixed inner diameter and smaller than the inner diameter of other parts of the outer limiting ring 43 along one end away from the connecting ring 41, and the circular ring at the inner side of the outer limiting ring 43 can be inserted into the groove of the groove joint 1.

The connecting piece 4 is an existing pipe clamp in the embodiment, the existing pipe clamp is also called a pipe hoop, the groove pipe fitting is a pipe clamp which is two semicircular clamping pieces connected by using a bolt, and the pipe clamp is two semicircular clamping pieces with one ends hinged and the other ends connected by using the bolt in other embodiments. In other embodiments, the arc-shaped pieces can be other arc-shaped pieces with U-shaped sections and can be connected with each other in a pressing mode.

The existing pipe clamp is used as the connecting piece 4, the cost of the groove soft joint is reduced, and workers can directly carry out installation operation without other training.

The connecting piece 4 is tightly connected with a sealing piece 5 which tightly seals and connects the groove joint 1 and the outer side surface of the flexible connecting pipe 2, and the whole structure of the sealing piece 5 is of an annular tubular structure. The seal 5 comprises an inner sealing ring 51 for sealing between the sizing frame 3 and the connector 4, and the seal 5 comprises an outer sealing ring 52 for sealing between the outer surface of the groove joint 1 and the connector 4.

The opposite ends of the inner sealing ring 51 and the outer sealing ring 52 are connected in a sealing manner, the cross section of the inner sealing ring 51 is similar to a right trapezoid, in the embodiment, the protective layer 23, the sealing layer 22, the inner sealing ring 51 and the outer sealing ring 52 are integrally formed, and rubber can be directly and integrally produced and formed.

The opposite ends of the inner sealing ring 51 and the outer sealing ring 52 are in sealing connection, so that the situation that fluid in the inner cavity of the groove soft joint enters a gap between the inner sealing ring 51 and the outer sealing ring 52, enters a gap between the sealing element 5 and the connecting element 4 and then seeps out is prevented, and the good sealing effect of the sealing element 5 is ensured.

The outer side surface of the outer sealing ring 52 is contacted with the inner side surface of the connecting ring 41, the surface of the outer sealing ring 52 opposite to the inner sealing ring 51 is contacted with the surface of the outer limiting ring 43 facing the inner limiting ring 42, and the inner side surface of the outer sealing ring 52 is contacted with the outer surface of the groove joint 1; the outer sealing ring 52 has a pressing groove 53 formed on a surface facing the inner sealing ring 51.

When fluid with pressure flows through the groove soft joint, the fluid with pressure can enter the pressing groove 53, the fluid with pressure exerts acting force on the side face of the pressing groove 53, and the pressure action between the outer sealing ring 52 and the outer side face of the groove joint 1 is larger along with the increase of the pressure in the fluid, so that the sealing performance of the outer sealing ring 52 between the groove joint 1 and the connecting piece 4 is higher.

The implementation principle of the above embodiment is as follows:

after will stereotype frame 3 and groove joint 1 align, locate the soft connecting tube 2 and the groove joint 1 outside with connecting piece 4 cover, the port of stereotype frame 3 and groove joint 1 is located between spacing ring 42 and the outer spacing ring 43 in, and outer spacing ring 43 is located the ditch inslot of groove joint 1, interior spacing ring 42 is located the one side of stereotype frame 3 groove joint 1 dorsad, it moves back to block groove joint 1 and stereotype frame 3, soft connecting tube 2 can bear certain pressure effect, sealing member 5 is used for keeping the sealed between soft connecting tube 2 and the groove joint 1, the other end of groove joint 1 is connected with the groove joint 1 of other pipelines or valves, be convenient for adjust the installation, the installation construction convenience of groove soft joint, and is low in cost.

Example two

A groove soft joint is different from the embodiment 1 in that one end of a soft connecting pipe 2 is fixedly provided with a shaping frame 3, and one end of the soft connecting pipe 2, which is provided with the shaping frame 3, is provided with a connecting piece 4 and a sealing piece 5. The other end of the flexible connecting pipe 2 is fixedly provided with a flange joint, and the end of the flexible connecting pipe 2 connected with the flange joint is connected with the existing flange joint of the flexible pipe. The other end that is applicable to one end and groove joint 1 and is connected, the other end and flange joint, can set up soft connecting tube 2 in other embodiments can set up other connected mode and pipeline high-speed joint.

The included angle between the axes of the two ports of the flexible connecting pipe 2 can be any angle which is greater than 0 degrees and less than or equal to 180 degrees, and is 90 degrees in the embodiment. The quick connection device is suitable for quick and stable connection of bent positions and non-coaxial positions of the groove pipeline.

EXAMPLE III

Referring to fig. 3, a groove soft joint is different from embodiment 1 in that an inner seal ring 51 and an outer seal ring 52 are separately provided. The outer sealing ring 52 is an annular sealing ring arranged in the groove of the groove joint 1, and the outer limiting ring 43, the outer sealing ring 52 and the groove joint 1 are in compression connection.

The inner sealing ring 51 is an annular sealing ring sleeved on the outer side of the shaping frame 3, and the shaping frame 3, the inner sealing ring 51 and the connecting piece 4 are connected in a pressing mode.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A groove soft joint is characterized in that: the groove joint comprises a flexible connecting pipe (2), the end part of the flexible connecting pipe (2) is fixedly provided with a rigid shaping frame (3), a connecting piece (4) for connecting the flexible connecting pipe (2) and the groove joint (1) is sleeved on the outer side of the shaping frame (3), and a sealing piece (5) for tightly connecting the groove joint (1) and the outer side surface of the flexible connecting pipe (2) is connected to the connecting piece (4) in a pressing mode;

the connecting piece (4) comprises a connecting ring (41), an inner limiting ring (42) is fixedly arranged at one end of the connecting ring (41) connected with the flexible connecting pipe (2), the inner limiting ring (42) can be partially overlapped with the projection of the shaping frame (3) along the central line direction of the flexible connecting pipe (2), and the inner limiting ring (42) limits the connecting piece (4) and the flexible connecting pipe (2) to move away from each other;

an outer limiting ring (43) is fixedly arranged at one end of the connecting ring (41) connected with the groove joint (1), and the inner side of the outer limiting ring (43) can be inserted into the groove of the groove joint (1);

sealing member (5) are including being used for finalizing the design sealed ring (51) sealed between frame (3) and connecting piece (4), sealing member (5) are including being used for groove joint (1) surface and connecting piece (4) between external seal ring (52).

2. The groove soft joint of claim 1, wherein: the opposite ends of the inner sealing ring (51) and the outer sealing ring (52) are connected in a sealing mode.

3. The groove soft joint of claim 1, wherein: the outer side face of the outer sealing ring (52) is in contact with the inner side face of the connecting ring (41), the surface of the outer sealing ring (52) opposite to the inner sealing ring (51) is in contact with the surface of the outer limiting ring (43) facing the inner limiting ring (42), and the inner side face of the outer sealing ring (52) is in contact with the outer surface of the groove joint (1);

the surface of the outer sealing ring (52) facing the inner sealing ring (51) is provided with a pressing groove (53).

4. The groove soft joint of claim 1, wherein: the flexible connecting pipe (2) comprises a tubular flexible supporting layer (21), the flexible connecting pipe (2) comprises a sealing layer (22) located on the inner side of the flexible supporting layer (21), and the sealing layer (22) blocks fluid in the inner cavity of the flexible connecting pipe (2) from flowing out.

5. The groove soft joint of claim 4, wherein: the flexible connecting pipe (2) comprises a protective layer (23) positioned on the outer side of the flexible supporting layer (21).

6. The groove soft joint of claim 4, wherein: the shaping frame (3) is positioned in the flexible supporting layer (21).

7. The groove soft joint of claim 5, wherein: the shaping frame (3) is a circular ring connected with the flexible connecting pipe (2), and the protective layer (23), the sealing layer (22), the inner sealing ring (51) and the outer sealing ring (52) are integrally formed.

8. The groove soft joint of claim 1, wherein: the both ends of flexible coupling pipe (2) all have set firmly shaping frame (3), the both ends of flexible coupling pipe (2) all are provided with connecting piece (4) and sealing member (5).

9. The groove soft joint of claim 1, wherein: the soft connecting pipe (2) is a similar spherical pipe with the inner diameter gradually reduced from the middle to two ends along the direction of the central line thereof.

10. The groove soft joint of claim 1, wherein: the connecting piece (4) is an existing pipe clamp.