EP3155271A1

EP3155271A1 - Connecting clip having a metal wire mat as a damping element

Info

Publication number: EP3155271A1
Application number: EP15728809.3A
Authority: EP
Inventors: Thomas Grieb; Bernd Prade
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2014-06-13
Filing date: 2015-06-05
Publication date: 2017-04-19
Also published as: US10132429B2; WO2015189105A1; EP2955393A1; US20180187799A1; JP2017530304A; CN106461123B; JP6531118B2; CN106461123A

Abstract

The invention relates to a connecting clip (1) for connecting two pipelines (5, 6), comprising a first clip arm (11), which is designed to extend at least partially around a circumference of a first pipeline (5), and a second clip arm (12), which is designed to extend at least partially around a circumference of a second pipeline (6), wherein the first and the second clip arm (5, 6) are connected to one another in a damping manner, and at least one metal mat is provided as damping element (20).

Description

description

Connecting clamp with metal wire mat as a damping element The operation of fluidic systems, which include a number of pipelines, sometimes occurs

Vibration movements of the pipelines due to the changing pressure conditions within them. In addition, it is also possible for forces to contribute to these movements, or to initiate these movements, which are impressed on the outside of the installation or produced by other components of the installation and thus contribute to vibrating the pipes. Due to the movements, not only damage to the piping itself may result, but it may, for example. Build up resonant vibrations, which can lead to major damage to the entire system. In the operation of gas turbines, it comes, for example, to such vibration movements in the pipelines of the external

Fuel supply. The oscillation movements can here about the welds on pipes, such as welding seams ^¬ between elbows and the burner flange damage. If there is a failure of the welds, is ^¬ with the shutdown of the entire gas turbine required, which has high downtime costs result.

In order to reduce the oscillatory motions in such conduits, pipe clamps are typically used which interconnect a number of conduits. Between the pipe clips and pipes, a damping material is, for example, is provided, which leads to a displacement of the vibration frequencies occurring ^¬ bung and an advantageous superposition or coupling of the movements of individual pipes. Due to the damping by means of the damping element also unwanted movements, in particular resonances can be significantly mitigated because vibration energy can be selectively converted into other forms of energy. As damping elements silicone materials are used approximately in fuel piping of a gas turbine, which are temperature resistant up to a temperature of about 325 ° C. However, since the pipelines in question obligations sometimes reach this temperature range operation of a gas turbine, and even exceed, the risk of failure of the Sili ^¬ konmaterials.

To this extent, it is an object of the present invention to provide a SITUATE designated connector clip which even in height ^¬ ren temperatures, especially at 325 ° C and can be used without material failure. At the same time the connection clamp to enable a sufficient attenuation of BEWE ^¬ conditions of the pipes so that the pipes can be safely used.

This problem underlying the invention is achieved by a connection clamp according to claim 1 and by a pipe system according to claim 6, a fuel pipe system according to claim 10 and a gas turbine according to claim 11.

In particular, the objects underlying the invention are achieved by a connecting clamp for connecting two pipes, comprising a first clamp arm, which is adapted to at least partially around one

Extending circumference of a first pipe, and a second clamp arm, which is adapted to extend at least partially around a circumference of a second pipe, wherein the first and second clamp arm are attenuated connected to each other, and at least one metal wire plate is provided as a damping element.

Furthermore, the objects underlying the invention are achieved by a pipe system comprising at least a first pipe and a second pipe, both of which are connected by means of a connection clamp according to the preceding and subsequent description. Moreover, the objects underlying the invention are achieved by a fuel pipe system of a gas turbine plant comprising at least a first pipeline for conveying fuel and a second pipeline for conveying fuel, which are both connected by means of a connection clamp as described above and below.

Likewise, the objects on which the invention is based are achieved by a gas turbine comprising such a fuel tube system.

The basic idea of the invention can be seen in the fact that two clamp arms of a connection clamp are connected to one another in a damped manner, a metal wire mat being provided as the damping element. In this case, the metal wire mat typically consists of a tangle of individual twisted metal wires, with the metal wire mat giving rise to a friction of individual wires in the composite with appropriate application of force. Of course, the tangle can also be replaced by a textile structure of any type, as far as this causes a corresponding damping by friction of individual wires when subjected to force. This friction leads to an energetic loss, which converts mechanical energy into heat energy. In this respect, the metal wire mat is suitable for carrying out such an energy conversion when subjected to force, even at high temperatures. So be associated with the connection clamp pipes excited into vibrational motions as with pressure fluctuations of the equipment in the pipes, these movements can gen are attenuated by introduction of a vibration force in the metal ^¬ wire mat. Since the metal wire mat is thermally stable even at high temperatures, such a vibration damping can be achieved even at high temperatures, especially at temperatures of about 325 ° C.

It should be noted at this point that the damping in the sense of the invention as a mechanical damping with respect to a movement of the two clamp arms or pipes against each other to understand. In other words, during movement of the two clamp arms at least a portion of the kinetic energy is converted into thermal heat by friction, so that upon movement of the two clamp arms or

Piping a mechanical damping can be done.

It should also be noted that a connection purposes of the invention is not the holder of the two pipelines requires in connection clamp, but a rei ^¬ ne material technical connection is already sufficient. Thus, for example, the two pipes can also be clamped together by the connection clamp. Preferably, the two pipes with the two clamp arms in direct contact, so that a non-positive transmission of vibra ^¬ tion energy from the pipes in the clamp arms suc ^¬ gene can. In addition, the clamp arms are preferably made Metalli ^¬ cal material, since this may also be stable to thermally demanding ^¬ applications.

According to a first particularly preferred embodiment of the invention, it is provided that the first clamp arm is designed to run more than half of the circumference of the ers ^¬ th pipe and / or the second clamp arm is formed to more than half of the circumference to run the second pipe. Bleeding in the circumferential direction in this case requires a suitable simulation of the peripheral surface of the pipes, so that the pipes can be practically held in the clamp arm, without requiring further devices. Due to the course of more than half of the circumference of the respective pipe, this can be held in the respective clamp arm, without slipping out of the holder in the absence of a mechanical force. Consequently, there is an effective support mechanism.

According to a further preferred embodiment of the invention it is provided that the first clamp arm in the area a Schellenarmendes with the second clamp arm is also connected in the region of a Schellenarmendes, the two other Schellenarmenden the two clamp arms are present unconnected. The Schellenarmenden here refer to the ends of the clamp arms in the longitudinal direction ^¬ direction of a material course of these. In particular, Kings ^¬ NEN the two associated clamp arms also have a portion which extends substantially parallel to the surface of the damping element in a linked form so that the power transmission takes place during the operation on a large ^¬ ßere surface of the damping element. Furthermore, in particular, the two unconnected Schellenarmenden each hold a pipe. A compound only in a region in which the two clamp arm ends are connected to each of different clamp arms, reduces material costs and facilitates easier maintenance, since the arrangement of the connecting portion can be carried out in a at accessible ^¬ chen area of the pipes. According to an alternative embodiment of the invention it is provided that the first clamp arm in the region of

Schellenarmendes with the second clamp arm is also connected in Be ^¬ rich a Schellenarmendes, the two other Schellenarmenden the two clamp arms can be brought together in a releasable hook connection. In other words, the other two Schellenarmenden can be releasably hooked together. The hook connection is in particular material-locking, ie the materials or both

Clamp arms touch materially.

The hook connection can furthermore be designed in such a way that the two hooked clamp arm ends have opposing beadings which engage in one another after being hooked, and thus can fix the two clamp arm ends together. The additional hook connection to the respectively associated clamp arm ends provide an additional attachment opportunity by means of which the pipelines further improved in ^¬ interconnected can be. Due to the solubility of the Hakverbindung this can be solved relatively quickly, if necessary, so that, for example, an exchange of the connection clamp, if necessary ^¬ easily, can be done easily.

According to another embodiment variant, the first Schellenarm may also be ver ^¬ connected in the region of Schellenarmendes with the second Schellenarm in the region of Schellenarmendes, with the other two clip arm ends of the two clamp arms are also connected damped each other, and as a damping element at least one metal wire ^¬ mat, in particular, a further metal wire mat is provided. A mutually damped connection of the clamp ^{arms ¬} can ensure an improved damping effect compared to an embodiment in which only one of the Schellenarmenden is provided only with a damping.

Furthermore, it is provided that also the first Schellenarm in the region of a Schellenarmendes with the second Schellenarm is in the range of one Schellenarmendes such ver ^¬ prevented that the two clamp arms, at least range ^¬ be present indirectly connected via the damping element. The two bracket arms are therefore always take at BEWE ^¬ account the respective pipelines, the kinetic energy into the damping element directly where the mechanical damping can take place.

According to a development of this embodiment, it is provided that the two connected Schellenarmenden have a recess through which a retaining pin for connecting both runs. The retaining pin may be connected to the two Schellenarmenden so that they continue to have a play of movement, wherein the movement is damped within the game of the damping element. In addition, the retaining pin ensures a secure connection of the two clamp arms, so that even with large vibration amplitudes effective damping can take place. As an alternative to such an embodiment, of course, the retaining pin on a Schellenarmende be dismissed firmly so that it must have no corresponding recess.

According to a further development of the invention, the damping element may also have a hole through which extends the retaining pin. It can accordingly be granted ^¬ ensure that the damping element can not fall out of the United ^¬ connection clamp inadvertently and the United ^¬ connection clamp as a result, can perform only an inadequate or no attenuation.

According to a further embodiment, the retaining pin may be formed as a threaded pin, which is braced with the two Schellen lenarmenden or can be clamped. A bracing can be carried out approximately so that the threaded pin ends are screwed with one nut, until the two Schellenarmenden present under tension. The threaded pin thus allows a particularly simple, ^{kostenk ¬} ge and easy to maintain embodiment of the retaining pin. Likewise, it is conceivable according to an alternative embodiment, that the retaining pin is designed as a screw. Such may be loose through the recesses of the two

Be clamped, or even attached to a clamp arm already, for example, welded or pressed with the clamp arm be pressed. After appropriate attachment of

Clamp on a pipe system can serve as the screw to brace mitei ^¬ nander the connection clamp and the pipe system. In order to support the introduction of a firmly connected with a clamp arm screw in the recess of the other clamp arm, the recess of the other clamp arm may also be formed as a slot.

The invention will be explained in more detail below with reference to individual figures. It should be pointed out that the technical features in the figures, which are provided with the same reference numerals, should have the same technical effects. Furthermore, it should be noted that the figures are only to be understood schematically and do not allow any limitation on the feasibility of the invention. In addition, it should be noted that the invention is to be claimed in its entirety with any combination of the technical features shown below, as far as the resulting embodiment can solve the task underlying the He ^¬ invention.

Hereby show:

1 shows a perspective view of a first exporting ^¬ approximate shape of the pipe system according to the invention and

Fuel tube system comprising a first Ausfüh ^¬ tion form a connection clamp according to the invention;

FIG. 2 shows a lateral sectional view through the embodiment of the pipe system or fuel pipe system according to the invention shown in FIG.

Figure 3 is a side perspective view of another

Embodiment of a pipe system according to the invention or fuel pipe system comprising an embodiment of a connection clamp according to the invention;

FIG. 4 shows a lateral sectional view through the embodiment of the pipe system or fuel pipe system according to the invention shown in FIG.

1 shows a first embodiment of the invention ^shown SEN pipe system 40 and fuel pipe system 50 having ei ^¬ ne embodiment of the connecting clamp 1 according to the invention. The fuel pipe system 50 may also be a part of a gas turbine (not shown further). The connection ^¬ clamp 1 in this case comprises a first Schellenarm 11 and ei ^¬ NEN second Schellenarm 12 each comprise a first conduit 5 and a second pipe. 6 For the purpose Bonding of the two clamp arms 11, 12 is provided on a clamp arm end 13 of the first clamp arm 11 and on a Schell lenarmende 14 of the second clamp arm 12, a connection by means of a retaining pin 30. The respective ones

Schellenarmenden 13, 14 have a suitable recess through which the running as a threaded pin retaining pin 30 is guided. At the same time, a damping element 20 is arranged between the two Schellenarmenden 13, 14, which is designed as a metal wire mat. For bracing the two clamp arms with each other, each end of the Hal ^¬ testift 30, a nut 31 is screwed so so that after appropriate application of force, the respective Schellenarmenden 13, 14 press against the damping element 20. In order to achieve an improvement of the power transmission from the clamp arms 11, 12 to the damping element 20, the respective clamp arm ends 13, 14 are shaped such that they run parallel at least in regions along the surface of the damping element 20. In particular, the two clamp arm ends 13, 14 thus run parallel to one another.

The other Schellenarmenden 15, 16 of the first clamp arm 11 and Schellenarms 12 each comprise a pipe ^¬ line 5, 6. The enclosure is executed according to material material ^¬ conclusively such that the respective clamp arms 11, 12, and Schellenarmenden 15, 16 the Shaping the peripheral shape of the first pipe 5 and the second pipe 6.

If, now for example. Due to pressure fluctuations in the operation of pipelines routed to oscillatory movements thereof, the mechanical forces from the respective pipe lines 5, 6 over the clamp arms 11, 12 in the damping element 20 is a ^¬. Since the damping element 20 is a metal wire mat, the metal wires with entspre ^¬ sponding movements therein are applied, the overall ben to a friction of the individual metal wires in the damping element 20 occasion. Due to the phenomena of friction, the mechanical energy is reduced and converted into thermal energy. A damping is thus achieved. Figure 2 shows the embodiment of the pipe system of the invention 40 and fuel pipe system 50 according to Figure 1 in egg ^¬ ner side sectional view. It can be clearly seen that the retaining pin 30 both through recesses on the

Schellenarmenden 13, 14 as well as through a hole in the damping element 20 extends. The damping element 20 can no longer fall out success ^¬ also goes for adverse vibration conditions from the composite so that safe operation can take place.

Further shows the sectional view of that both the first 11 and the second Schellenarm Schellenarm 12 are formed to more than half the circumference of the jeweili ^¬ gen pipelines 5, to pass. 6 The pipes are consequently securely held in the respective clamp arms 11, 12. In the present case, the enclosure of the respective tube ^¬ cross section through the associated clamp arm 11, 12, at most by 5% more compared to an exactly half enclosure (ie enclosure by 180 ° in the circumferential direction of the tube cross-section) is provided. According to version, this allows each ^¬ weiligen pipelines 5, 6 in the associated clamp arm ends 15, 16 and einzuklippen largely safe to hold.

FIG. 3 shows a further embodiment of the inventive pipe system 40, or fuel pipe system 50, which has a further embodiment of the connecting clip 1 according to the invention. The fuel tube system 50 may also be part of a gas turbine not shown further. The connection clamp 1 shown in FIG. 3 differs from the connection clamps 1 shown in the previous figures in that the clamp ^arm ends 15, 16 not connected via the damping element 20 are arranged in one

Hook connection with each other. The Schellenarmenden 15, 16 are at least partially provided with a bead, wherein the respective Umbördelungen the mutually associated Schellenarmenden 15, 16 are formed with the respective other opposite. As a result, the two can

Clasps intermesh to make a hook connection to build. This Hakverbindung can be easily solved by appropriate mechanical handling, so that the entire connection clamp 1 can be easily removed from the pipes 5, 6 again.

Figure 4 shows a lateral sectional view through the exporting ^¬ approximate shape of the pipe system 40 shown in Figure 3, or

Fuel pipe system 50. Here, the Hakverbindung the two Schellenarmenden 15, 16 are clearly perceived.

Further embodiments emerge from the subclaims.

Claims

claims

A connection clamp (1) for connecting two pipes (5, 6), comprising a first clamp arm (11), which is designed to extend at least partially around a circumference of a first pipe (5), and a second clamp arm (12). which is designed to extend at least partially around a circumference of a second pipeline (6), wherein the first and second clamp arms (5, 6) are damped with each other, and at least one metal wire mat is provided as the damping element (20).

2. Connecting clamp according to claim 1,

d a d u r c h e s e n c i n e s, d a s s

the first Schellenarm (11) is adapted to more than half the circumference of the first pipe (5) is designed to duri ^¬ fen and / or the second Schellenarm (12) to more than half the circumference of the second Rohrlei ^¬ tion (6) to run.

3. connection clamp according to one of the preceding Ansprü ^¬ che,

d a d u r c h e s e n c i n e s, d a s s

the first clamp arm (11) in the region of a Schellenarmendes (13) with the second clamp arm (12) is also connected in the region of a Schellenarmendes (15), wherein the other two Schellenarmenden (14, 16) of the two clamp arms (11, 12) with each other unconnected.

4. Connecting clamp according to one of the preceding claims 1 to 3,

d a d u r c h e s e n c i n e s, d a s s

the first clamp arm (11) in the region of a Schellenarmendes (13) with the second clamp arm (12) is also connected in the region of a Schellenarmendes (15), wherein the other two Schellenarmenden (14, 16) of the two clamp arms (11, 12) with each other can be brought into a releasable hook connection.

5. connection clamp according to one of the preceding Ansprü ^¬ che,

d a d u r c h e s e n c i n e s, d a s s

the first clamp arm (11) in the region of a clamp arm end (13) is likewise connected to the second clamp arm (12) in the region of a clamp arm end (15), and wherein the other clamp ^{arm ends} (14, 16) of the two clamp arms (11, 12) are also connected to each other attenuated, and as a damping element at least one metal wire mat, in particular ^¬ special a further metal wire mat is provided.

6. connection clamp according to one of the preceding Ansprü ^¬ che,

d a d u r c h e s e n c i n e s, d a s s

the first clamp arm (11) in the region of one clamp arm end (13) is likewise connected to the second clamp arm (12) in the region of the one clamp arm end (15) in such a way that the two clamp arms (11, 12) at least partially indirectly via the clamp arm end (12) Damping element (20) connected to each other.

7. Connecting clamp according to claim 6,

d a d u r c h e s e n c i n e s, d a s s

the two connected Schellenarmenden (13, 15) have a recess through which a retaining pin (30) extends to connect both.

8. Connecting clip according to claim 7,

d a d u r c h e s e n c i n e s, d a s s

the damping element (20) also has a hole through which the retaining pin (30) extends.

9. Connecting clamp according to claim 7 or 8,

d a d u r c h e s e n c i n e s, d a s s

the retaining pin (30) is designed as a threaded pin, which is braced with the two Schellenarmenden (13, 15).

10. Pipe system (40) comprising at least a first Rohrlei ^¬ tion (5) and a second pipe (6), which are both connected by ^{¬ means of} a connection clamp (1) according to one of vorherge ^¬ existing claims.

11. fuel pipe system (50) of a gas turbine plant comprising at least a first conduit (5) for conveying fuel and a second conduit (6) used for carrying ^¬ tion of fuel, both of which clamp means of a connection (1) according to claim 1 to 9 are connected.

12. A gas turbine comprising a fuel pipe system (50) according to claim 11.