CN1204388A - Flexible coupling device - Google Patents

Abstract

A flexible coupling for connecting successive lengths of pipe (11, 12) in a vehicle exhaust system. A pipe inner part (20) is inserted into the adjacent ends of the two pipe joints (14, 15), and the pipe joints are respectively fixed on the ends of the corresponding adjacent pipes. A first gasket member (25) is attached radially and axially between the end of a pipe joint member and the inner pipe member. A second gasket member (26) is attached radially and axially between the other pipe joint end and the pipe inner member. A flexible, extensible sealing member is mechanically connected to the fitting member, then the pipe end, in turn.

Description

Flexible coupling device

Background of the invention

This invention relates to couplings for joining the ends of continuous lengths of pipe or conduit, and more particularly to couplings for joining the ends of continuous pipes in vehicle exhaust systems.

Internal combustion (i.c) engines are known to produce significant vibrations in the exhaust pipe in vehicle exhaust systems, especially those of heavy vehicles such as large trucks or earth moving equipment vehicles. Running the engine continuously for an extended period of time creates so-called resonances, which can cause significant flexing of the exhaust pipe extension. Repeated flexing of the exhaust pipe can weaken the pipe over time, eventually rendering it useless. In addition, this resonance will be transmitted through the exhaust pipe to the fixings of the pipe, causing loosening of the fixings, which may cause a sudden deflection of one or more components in the exhaust system, which may cause injury , or damage the device.

In addition to the vibrations generated by the vehicle's engine, an exhaust system is subjected to various tensile, compressive and bending forces generated by the operation of the vehicle. Although individual components can be made stronger and larger to overcome failures due to fatigue, such a structure is not desirable due to weight considerations. Also making the individual components more rigid will only transmit the vibrations to the mounts or other components of the exhaust system without reducing or eliminating the vibrations. It is therefore desirable to isolate the exhaust system, or at least the components of the exhaust system, from such vibrations and forces

It is known that resonances due to the engine can be eliminated or reduced if the pipes of the exhaust system are separated by non-rigid connections, rather than extending continuously their length. This non-rigid connection can advantageously be used to absorb other tensile, compressive and bending forces in addition to dampening the vibration of the motor.

Thus, it is expected to obtain a coupling for connecting exhaust pipes so that their lengths are continuous, this coupling connects the pipes in a non-rigid manner, and can absorb tensile, compressive and bending forces, and will not vibrate And force is transmitted from one tube to another.

An example of a prior art coupling can be found in Usui's U.S. Patent No. 4,792,161. In Usui, a pair of concentrically arranged spring coils are used to provide a mechanical connection between the tubes to be joined. One disadvantage of the couplings in Usui is that when the coils are in tension or bending configuration, gaps may be created between the individual turns of the coils, into which dirt, debris and moisture may intrude, thus causing damage due to wear, rust, etc. The reason may affect the operation of the spring coil. Additionally, the spring coils (their construction is threaded one within the other) are unprotected and constantly exposed to the elements, making them vulnerable to damage from abrasion or other unwanted physical contact. Another disadvantage of the Usui coupling arrangement is that it relies on a sealing ring disposed between the ends of the overlapping conduits as a sealing method to prevent the escape of exhaust gases. The sealing ring is subjected to periodic bending, pulling and compressing forces, eventually compromising the sealing performance and requiring the coupling to be replaced.

Another prior art coupler arrangement is disclosed in Udell's U.S. Patent No. 5,145,215. In Udell, an inner sleeve part is arranged concentrically within an outer sleeve part. A substantially porous non-hermetic shock absorbing gasket is disposed between overlapping portions of the sleeve members to eliminate direct contact between the sleeve members. The gasket components are non-sealed to eliminate galling while minimizing the effects of interaction and engagement between sleeve components. A flexible, extensible bellows member is mechanically connected to the sleeve member at the distal non-overlapping end of the sleeve. A spacer member, typically a braided wire, surrounds the bellows member to protect the extensible bellows member from external elements and forces.

Although the device of the Udell patent is capable of adjusting tension, compression, and relative pivoting of the ends of the connected pipes, the Udell device has only a single "pivot point" and is therefore limited in the amount of relative pivoting that can be adjusted. Additionally, the axes of the two connected tubes cannot move to a non-intersecting (ie, oblique) relationship within the compressible range of the gasket member. In addition, Udell's device is more suitable for adjusting tension than for adjusting pressure. It is possible, though less common, for excessive compression of the coupling, which can cause components to seize or deform, which can adversely affect the future performance of the coupling and may even lead to premature failure and failure of the coupling . It fails to provide a proper "stop" structure to prevent this kind of stuck.

It would be desirable to provide a flexible coupling device having an enhanced, more robust construction for isolating an exhaust system from a source of vibration, such as an internal combustion engine.

It would also be desirable to provide a flexible coupling arrangement for an exhaust system that adjusts the orientation of the pipe ends to achieve a non-intersecting (biased) connection relationship.

It would also be desirable to provide a flexible coupling device that is constructed to provide a positive stop action against overcompression of the coupling device.

These and other objects of the present invention will become more apparent from the specification, claims and drawings.

Technical scheme of the present invention

This invention relates directly to a flexible coupling device for connecting adjacent ends of continuous pipes for directing fluid flow from one of the two pipes to the other of the two pipes while preventing Vibration transmission between two tubes.

The flexible coupling device includes: a first pipe joint part, which has a first end and a second free end, the first end is configured so that it can be movably fixed on the first end of the two pipes. and a second fitting part, which has a first end and a second free end, the first end being configured so that it can be movably fixed to the second of the two pipes. on the pipe. The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in A non-stressed state.

An inner part is provided which has two free ends which are inserted into respective second free ends of the first and second pipe connection parts. The two free ends of the inner part are also surrounded by the circumference of the second free ends of the first and second pipe connection parts, respectively.

At least first and second elastic gasket parts are provided, respectively movably arranged between a first free end of the inner part and a free end of the first or second pipe joint, and a second free end of the inner part. Between the end and the other free end of the first or second pipe joint, the two elastic gasket members are used to absorb the vibration from either of the first and second pipes and prevent the vibration from being transmitted to the other tube. At least first and second resilient gasket members are radially encompassed between at least two free ends of the inner member and the respective first and second pipe joint member free ends. At least a portion of each washer of at least the first and second resilient washer members is also movably arranged to move axially relative to at least one of the inner member, first and second fitting members, respectively.

At least one elastic sealing member that is not directly fixed to the first and second pipes is provided to prevent fluid from escaping from the flexible coupling device, and to maintain the mutual flexible connection between the first and second pipes, and to be able to adjust the first Mutual axial compression and extension movement between the second tube and the second tube can adjust the orientation of the tubes so that their longitudinal axes are in a non-intersecting relationship.

In a preferred embodiment of the invention, at least one stop member is movably arranged around the inner part, which is configured to be movably configured so that direct axial abutment between the first and second pipe joint parts is not possible. touch.

The resilient sealing member also includes a flexible tubular bellows member having a plurality of circumferential corrugations along its length.

Each gasket member preferably comprises a resilient annular member of wire mesh material. Alternatively each gasket member comprises a resilient annular member of ceramic fiber material.

The invention also includes a flexible coupling device for connecting adjacent ends of continuous pipes and directing fluid flow from one of the two pipes to the other of the two pipes while preventing the flow of fluid between the two pipes. Vibration transmission between pipes, wherein the flexible coupling device includes: a first pipe joint part, which has a first end and a second free end, the first end is configured so that it can be movably fixed on the first of the two pipes; and a second fitting part having a first end and a second free end, the first end being configured to be movably fixed on the second of the two pipes. The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in A non-stressed state; an inner part has two free ends, and these two free ends are respectively inserted into the corresponding second free ends of the first and second pipe joint parts, and the two free ends of the inner part Also surrounded by the circumference of the second free ends of the first and second fitting parts, respectively.

At least first and second elastic gasket parts are provided, respectively movably arranged between a first free end of the inner part and a free end of the first or second pipe joint, and a second free end of the inner part. Between the end and the other free end of the first or second pipe joint, the two elastic gasket members are used to absorb the vibration from either of the first and second pipes and prevent the vibration from being transmitted to the other The pipe, at least first and second elastic washer parts are radially surrounded between at least two respective free ends of the inner part and respective first and second pipe joint part free ends. Also at least a portion of each of the at least first and second resilient washer parts is movably arranged to move axially relative to at least one of the inner part and the first and second fitting parts, respectively. .

At least one elastic sealing member that is not directly fixed to the first and second pipes is provided to prevent fluid from escaping from the flexible coupling device, and to maintain the mutual flexible connection between the first and second pipes, and to be able to adjust the first Mutual axial compression and extension movement between the second tube and the second tube can adjust the orientation of the tubes so that their longitudinal axes are in a non-intersecting relationship.

the elastic sealing member is made movable so that it can circumferentially surround the entire inner member, at least the first and second gasket members and at least a part of at least one of the first and second pipe joint members, and extend axially, Also covering at least a portion of each of the two tubes.

In another preferred embodiment of the present invention, at least one stop member is movably arranged around the inner part, and it is made into a movable structure so that direct axial butt contact between the first and second pipe joint parts is not possible. .

In addition at least one stop member comprises an annular member having an axial width around its circumference, wherein in at least one area along the circumference its axial width is substantially greater than in other areas along the circumference.

In one embodiment of the invention at least one washer part is fastened to the inner part, and in another embodiment of the invention at least one stop part is fastened to the inner part.

In yet another embodiment of the present invention, a flexible coupling device is provided for connecting adjacent ends of continuous pipes to direct fluid flow from one of the two pipes to the other of the two pipes root, while preventing vibration transmission between the two pipes.

A first fitting part has a first end and a second free end, the first end being configured to be removably secured to the first of the two pipes. A second fitting part has a first end and a second free end, the first end being configured to be removably secured to the second of the two pipes. The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in A non-stressed state. An outer part has two free ends, which are respectively inserted into the corresponding second free ends of the first and second fitting parts, and the two free ends of the outer part also circumferentially surround the first and the second free end of the second fitting part.

At least first and second resilient gasket members are respectively movably disposed between a first free end of the outer member and a free end of the first or second pipe joint and between a second free end of the outer member and Between the other free ends of the first or second pipe joint, the two elastic gasket members are used to absorb vibration from either of the first and second pipes and prevent the vibration from being transmitted to the other pipe.

At least first and second resilient gasket members are radially encompassed between at least two free ends of the outer member and respective first and second pipe joint member free ends. Also at least a portion of each of the at least first and second resilient washer parts is movably arranged to move axially relative to at least one of the outer part and the first and second fitting parts, respectively. . An elastic sealing member not directly fixed to at least the first and second tubes is used to prevent fluid from escaping from the flexible coupling device and to maintain a flexible connection between the first and second tubes, capable of adjusting the first and second tubes Mutual axial compression and extension movement of the second tubes adjusts the orientation of the tubes so that their longitudinal axes are in a non-intersecting relationship.

At least one stop member is movably disposed within the outer member, and is movably configured to prevent direct axial butt contact between the first and second pipe joint members.

Brief introduction to the drawings

Fig. 1 is a side sectional view of the flexible coupling of the present invention;

Figure 2 is a very simplified schematic diagram of the device of the present invention disposed between the ends of two pipes, illustrating all possible angular deflections between the ends of the two pipes;

Figure 3 is a simplified schematic diagram of the device of the present invention disposed between the ends of two pipes, illustrating the ability of the device to allow non-intersecting positioning of the ends of the two pipes;

Figure 4 is a perspective view of a gasket component of another preferred embodiment of the present invention;

Fig. 5 is a side view of the gasket part in the embodiment of Fig. 4;

Fig. 6 is a top view of the gasket part in the embodiment of Fig. 4;

Fig. 7 is a partial side sectional view of another embodiment of the flexible coupling of the present invention.

Detailed description of the drawings

Although the embodiments of the present invention can have many different forms, only a specific given embodiment shown in the drawings will be described in detail here, and this description should be understood as an example of the principles of the present invention only, and The invention should not be limited to the shown embodiments.

Figure 1 shows a side cross-sectional view of a flexible coupling device 10 of the present invention. Since the preferred embodiment of the device 10 of the present invention will be radially symmetric about the central axis _Ct , only the "upper" portion of the coupling device 10 will be described, it being understood that the "lower" portion will be symmetrically arranged about the axis _Ct .

The pipe ends 11 and 12 will be connected in such a way that the vibration transmission from the pipe end 11 to the pipe end 12 can be isolated. The fitting parts 14 and 15 are substantially cylindrical parts, each having substantially the same diameter as the respective pipe end 11 , 12 . Tube fittings 14 and 15 are permanently affixed to ends 11 and 12 by welding, brazing or other suitable known techniques. Although as shown in FIG. 1, the diameter of the fitting parts is slightly larger than the diameter of the ends 11 and 12, in other embodiments (not shown) the diameter of the fitting parts 14 and 15 may be significantly larger than the diameter of the ends 11 and 12. , or slightly smaller than the diameter of the end portions 11 and 12, or just equal to the diameter of their respective end portions 11, 12, in which case the fitting parts will be butt welded to the respective end portions. Flanges 17 , 18 extending radially inwardly are formed on the pipe joint parts 14 and 15 .

An inner part 20 is provided, which is understood to be a substantially cylindrical part, although only halfway shown in section. The inner part 20 is coaxially mounted radially inwardly along the pipe joint parts 14 and 15 . Usually the diameter of the inner pipe part 20 must be smaller than the diameter of the pipe joint parts 14 and 15, and can also be smaller than the diameter of the pipe ends 11 and 12. Folded-out flanges 22 and 23 are formed on the inner part 20, which has a short length relative to the dimensions of the overall device, using known manufacturing techniques. For certain applications, the length of the inner part 20 is only equal to the diameter of one of the pipes to be joined. Therefore, the length of the inner part 20 is at most only slightly larger than its own diameter, and may also be smaller than its own diameter.

Preferably, the annular gasket members 25 and 26 are made of a metal mesh material which is resilient, though somewhat loose, and packs relatively tightly. Other materials such as resilient, heat-resistant ceramic fiber materials can also be used to form gasket components. In the preferred embodiment of the present invention, each gasket member 25, 26 is free to move along the The inner part 20 moves axially to a certain extent and may be blocked by the flanges 17,18 on the fitting parts 14,15. The gasket parts 25, 26 are made to be compressible, so that when the pipes 11 and 12 are substantially on the same line, and the pipes are displaceable due to lateral displacement or due to an external force due to mutual rotation of a certain angle. In the event of deflection, they absorb and overcome lateral vibration as well as axial vibration within the tolerance range of the component and the maximum compressibility factor of the gasket component. While the gasket members 25, 26 need not be porous, they must have at least some degree of resiliency in order to achieve the desired vibration isolation between the connected pipes. In addition, the gasket parts 25, 26 may be field welded to the nipple parts 14 and 15 or the inner part 20 respectively, but not to both parts at the same time, if desired.

The device 10 may also be provided with an annular stop member 28 which may be secured to the outer surface of the inner member 20 and is preferably located midway along the length of the inner member. Alternatively, the stop part 28 can simply be provided around the inner part. Preferably, the stop member 28 is made of the same material from which the gasket members 25, 26 are made (steel mesh, ceramic fibers, etc.) or may be made of a harder or softer material, There may even be a ring made of ceramic, metal or elastomeric material, or other suitable durable heat-resistant material, which may simply be fitted on the inner part, or be fixed by welding, brazing or other suitable fastening means on the inner part 20. In the absence of a stop member 28 on a given device 10, the remainder of the structure should be dimensioned appropriately for a particular application so that the device 10 does not compress to the extent that the flanges will 17 and 18 are adjacent. This proper sizing will prevent "chattering" of the coupling during operation.

In another configuration, an annular spring member, such as a disc spring, may be used instead of the stop member 28 .

(As illustrated, when the diameter of the pipe joint parts 14 and 15 is greater than the ends 11 and 12) may be by any known technique, such as welding or brazing, will have the end 31 around the joint pipe parts 14, 15 The bellows 30 of 32 and 32 are fixedly welded on the pipe joint parts 14,15. Alternatively, the bellows ends 31, 32 may be inserted if the fitting parts are inserted into the ends 11 and 12 and locked mechanically therein, or if the bellows ends 31, 32 extend axially beyond the fitting parts 14, 15. 31 and 32 are fixed and welded directly to the ends 11 and 12. The corrugated portion of the bellows 30 will have sufficient axial length such that all of the inner part 20, the gasket parts 25, 26 and the fitting parts 14, 15 covering the part of the inner part 20 are included in the length of the corrugated part. guilty.

Circumferential collars 34, 35 may also be provided so that they fit around the ends 31, 32 of the bellows. In order to weld and fasten the various parts together, suitable welding, soldering and/or crimping can be used according to known techniques.

The methods for forming and assembling the above-mentioned different components can refer to known technologies, and those skilled in the art can easily complete the components and install them after understanding the present disclosure. A detailed description of the construction and assembly of the flexible coupling 10 is therefore not necessary for a complete understanding of the structure and mode of operation of the present invention.

In operation, installation of the flexible coupling 10 in the configuration shown in FIG. 1 is essentially the normal resting state of the device 10. The washers 25, 26 are not compressed axially, although they may be compressed radially. By pulling the ends 11 and 12 apart, the adjusting device 10 is stretched somewhat axially, which causes the washers 25, 26 to be axially compressed. Axial compression of the device 10 will cause one or both of the flanges 17, 18 to move towards the optional stop member 28 (if provided) and eventually abut it. Additionally, the gasket components 25, 26, which are resistant to compression in all directions, will allow angular deflection of the tube (1) 1 relative to the tube (1) 2 (see Figure 2) within the tolerances of the components. For example, for a connection having a nominal diameter of 2 inches, the expected total angular deflection is 10-12°.

In addition, depending on the diameter of the device 10, the ends 11 and 12, the relative axial lengths of the fittings 14 and 15, the inner part 20 and the gasket parts 25, 26, and other factors, may allow the ends 11 and 12 to take such a A structure such that the axes separating the ends 11 and 12 do not intersect, but are parallel to each other or completely inclined (as in FIG. 3 ). That is, the inner free ends of the pipe joints 14, 15 with flanges 17, 18 cooperate with the flanges 22, 23 and washers 25, 26 of the inner part 20, respectively, to provide two pivotal connection points, which are substantially between points 40 and 41 has a center of rotation. From the above, the entire coupling device can be regarded as a device that allows a 10-12° angle of inclination, and each pivot connection point is considered to allow a 5-6° (that is, a possible total inclination of 10-12°) Half) inclined b-angled or c-angled.

Bellows member 30 should be made to accommodate all combinations of these movements in accordance with each of the foregoing angular inclination modes, while maintaining a watertight seal at each end to ensure that no gas escapes through device 10 . Additionally, the bellows member 30 allows the coupling assembly 10 to be compressed or expanded, if necessary, during installation, and also allows the coupling 10 to be subject to such compression and expansion during operation, while still maintaining the two tube ends. Mechanical seal connection between parts 11 and 12.

In the preferred embodiment shown in Figures 1 to 3, the stop member 28 is illustrated and conceived as a simple circular ring having a uniform rectangular cross-sectional shape. In another embodiment of the invention ( FIGS. 4 , 5 and 6 ), the stop member 55 can have a widened portion 56 . As shown in Figures 4 to 6, it can be judged that the proportion of the widened portion is somewhat enlarged, and it can be expected that the axial length of the widened portion is greater than that of the non-widened portion, which is about 1/2 of the entire axial length of the stopper. 10-20%. For example, the axial length of a widened part of a stopper part whose axial length is 8 mm may be 10-12 mm. Also, although the circumferential arc encompassed by each widened portion of the retaining member is preferably about 90 to 100°, smaller arcs may be used if desired. Preferably, two widened portions 56 are provided on the stop member 55 , diametrically opposite to each other on the stop member 55 . The widened portion will be axially constrained by the flange 17 or 18 respectively. In addition, additional widenings can be provided, which are preferably arranged radially symmetrically around the circumference of the retaining element. The widening takes place only in the direction of the shaft, and the radial thickness of this widened portion of the stop member is preferably the same as the unwidened portion (at least in the axially uncompressed state). Although enhanced pivoting action can be achieved using a stop member such as stop member 55, there is no excessive axial "play" in the coupling.

In another embodiment of the invention (not shown), the flexible coupling device has, in addition to or instead of the stop member 55 with the widened portion, one or two washer parts with the widened portion. In another preferred embodiment, the widening is only along one axial "surface" of the gasket part. For example referring to Fig. 5, assume that object 55 has been replaced by a gasket part, in this preferred embodiment, one or (preferably) both gasket parts are widened on one side of the symmetrical S plane, and the other axial The surface is still flat. In such an embodiment, it is preferred that the flat surfaces be oriented so that they are generally axially outward facing surfaces relative to the coupling device, and the surfaces of the widened portion are oriented such that they are relatively For coupling devices, generally the axially inward facing surface. That is, the widened portion will face the center of the coupling, while the flat shaft surface will face away from the center of the coupling assembly. In yet another embodiment, the widening will be carried out on both axial surfaces of the washer part (in this way reference may be made to the stop part 55 described in Figures 4 to 6). As noted above, any type of widened washer member may be used with or in place of the widened stop member.

In any other embodiment, a stop member or one or more gasket members have widened portions, then such corresponding stop members or gasket members are preferably secured to the inner member 20 by any suitable means. , such as on-site welding, brazing, etc.

In yet another embodiment of the invention (Fig. 7), in the device 10', the fitting parts 14', 15' have radially outwardly diverging flanges 17' and 18'. In the partial cross-sectional view shown in Figure 7, it can be seen that the cross-section shown is used to represent the cross-section of the pipe end and its pipe joint parts and other components, except that, the other parts described are basically Cylindrical. The free ends of the fitting parts 14' and 15' can be necked down as shown, or they can be simply cylindrical parts as shown in Figure 1 . Instead of the inner part 20, an outer part 20' may be used which circumferentially surrounds at least a part of the free ends of the coupling parts 14' and 15'. Washer members 25' and 26', and optional stop member 28' may be the same as those described in the examples of Figures 1 to 6, including those of a different configuration with widened portions. If a stop member 28' is provided, it generally does not require any form of fixing to maintain its correct position within the outer part 20', so materials that can be used to manufacture the stop member 28' (or stop member 28) are those The stop member 28' can be made of a relatively solid (albeit at least somewhat resilient) material and has a solid body. Additionally, the stop member 28' is preferably dimensioned such that a slight radial compression of the stop member 28' occurs when it is inserted into the outer member 20'.

Functionality in compression, extension and bending modes for the other coupler devices 10' is envisaged in substantially the same manner as shown in Figures 1-6.

Above-mentioned specification sheet and accompanying drawing are only used for explaining and illustrating the present invention, and the present invention is not limited to above-mentioned description, and it is only limited by appended claims, after the skilled worker understands this disclosure patent, can Several modifications and changes can be made to the present invention without departing from the scope of the present invention.

Claims (29)

1. A flexible coupling device used to connect adjacent ends of continuous pipes and direct fluid flow from one of the two pipes to the other of the two pipes while preventing the flow of fluid between the two pipes. For vibration transmission, the flexible coupling device includes: a first fitting part having a first end and a second free end, the first end being configured to be removably secured to the first of the two pipes; a second fitting part having a first end and a second free end, the first end being configured to be removably secured to the second of the two pipes, The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in - non-stressed state; an inner part having two free ends which are inserted into respective second free ends of the first and second fitting parts, The two free ends of the inner part are also surrounded by the circumference of the second free ends of the first and second fitting parts, respectively; At least first and second resilient gasket members are movably disposed between a first free end of the inner member and a free end in the first or second pipe joint, respectively, and a second free end of the inner member part and the other free end of the first or second pipe joint, use these two elastic gasket parts to absorb the vibration from any one of the first and second pipes and prevent the vibration from being transmitted to the other pipe son, At least first and second elastic gasket parts are radially surrounded between at least two free ends of the inner part and the corresponding free ends of the first and second pipe joint parts, Also at least a portion of each of the at least first and second resilient washer parts is movably arranged to move axially relative to at least one of the inner part and the first and second fitting parts, respectively. ;as well as, An elastic sealing member not directly fixed to at least the first and second pipes is used to prevent fluid from escaping from the flexible coupling device and to maintain the mutual flexible connection between the first and second pipes, capable of adjusting the first and second pipes Mutual axial compression and extension movement of the second tubes adjusts the orientation of the tubes so that their longitudinal axes are in a non-intersecting relationship. 2. A flexible coupling device as claimed in claim 1, further comprising: At least one stop member is movably disposed about the inner member and is movably configured to prevent direct axial abutting contact between the first and second fitting members. 3. A flexible coupling device as claimed in claim 1, wherein the elastic sealing member further comprises a flexible tubular bellows member having a plurality of circumferential corrugations along the length of the bellows member. 4. A flexible coupling device as claimed in claim 1, wherein each gasket member comprises: An elastic loop member made of wire mesh material. 5. A flexible coupling device as claimed in claim 1, wherein each gasket member comprises: An elastic annular member made of ceramic fiber material. 6. A flexible coupling device used to connect adjacent ends of continuous pipes and direct fluid flow from one of the two pipes to the other of the two pipes while preventing the flow of fluid between the two pipes. For vibration transmission, the flexible coupling device includes: a first fitting part having a first end and a second free end, the first end being configured to be removably secured to the first of the two pipes; a second fitting part having a first end and a second free end, the first end being configured to be removably secured to the second of the two pipes, The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in - non-stressed state; an inner part having two free ends which are inserted into respective second free ends of the first and second fitting parts, The two free ends of the inner part are also surrounded by the circumference of the second free ends of the first and second fitting parts, respectively; At least first and second resilient gasket members are movably disposed between a first free end of the inner member and a free end in the first or second pipe joint, respectively, and a second free end of the inner member part and the other free end of the first or second pipe joint, use these two elastic gasket parts to absorb the vibration from any one of the first and second pipes and prevent the vibration from being transmitted to the other pipe son, At least first and second resilient gasket parts radially surround at least two respective free ends of the inner part and respective first and second pipe joint part free ends, Also at least a portion of each of the at least first and second resilient washer parts is movably arranged to move axially relative to at least one of the inner part and the first and second fitting parts, respectively. ;as well as, An elastic sealing member not directly fixed to at least the first and second pipes is used to prevent fluid from escaping from the flexible coupling device and to maintain the mutual flexible connection between the first and second pipes, capable of adjusting the first and second pipes The mutual axial compression and extension movement between the second tubes can adjust the orientation of the tubes so that their longitudinal axes are in a non-intersecting positional relationship, and the elastic sealing member is made movable so that it can circumferentially surround the The entirety of the inner member, at least the first and second gasket members, and at least a portion of at least one of the first and second fitting members, and extending axially, also covers at least a portion of each of the two pipes part. 7. A flexible coupling device as claimed in claim 6, further comprising: At least one stop member is movably disposed about the inner member and is movably configured to prevent direct axial abutting contact between the first and second fitting members. 8. A flexible coupling device as claimed in claim 6, wherein the resilient sealing member further comprises a flexible tubular bellows member having a plurality of circumferential corrugations along the length of the bellows member. 9. A flexible coupling device as claimed in claim 6, wherein each gasket member comprises: An elastic loop member made of wire mesh material. 10. A flexible coupling device as claimed in claim 6, wherein each gasket member comprises: An elastic annular member made of ceramic fiber material. 11. A flexible coupling device as claimed in claim 1, wherein at least one of said at least two gasket members comprises: A resilient, substantially annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 12. A flexible coupling device as claimed in claim 6, wherein at least one of said at least two gasket members comprises: A resilient, substantially annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 13. A flexible coupling device as claimed in claim 1, further comprising: At least one stopper part is movably arranged around the inner part and fixed on the inner part, and is made into a movable structure so that the direct axial butt contact between the first and second pipe joint parts is impossible. 14. A flexible coupling device as claimed in claim 6, further comprising: At least one stop member is movably disposed around and fixed to the inner member, and is configured to be movable so that direct axial butt contact between the first and second pipe joint members is prevented. 15. A flexible coupling device as claimed in claim 2, wherein at least one of the at least one stop member comprises: An annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 16. A flexible coupling device as claimed in claim 7, wherein at least one of the at least one stop member comprises: An annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 17. 11. A flexible coupling device as claimed in claim 11, wherein at least one gasket member is secured to the inner member. 18. 12. A flexible coupling device as claimed in claim 12, wherein at least one washer member is secured to the inner member. 19. 15. A flexible coupling arrangement as claimed in claim 15, wherein at least one stop member is secured to the inner member. 20. 16. A flexible coupling device as claimed in claim 16, wherein at least one stop member is secured to the inner member. twenty one. A flexible coupling device used to connect adjacent ends of continuous pipes and direct fluid flow from one of the two pipes to the other of the two pipes while preventing the flow of fluid between the two pipes. For vibration transmission, the flexible coupling device includes: a first fitting part having a first end and a second free end, the first end being configured to be removably secured to the first of the two pipes; a second fitting part having a first end and a second free end, the first end being configured to be removably secured to the second of the two pipes, The second free ends of the first and second pipe joint parts are normally axially spaced apart when the first and second pipe joint parts are secured to the first and second pipes, respectively, and the coupling device is in - non-stressed state; an outer part having two free ends which are inserted into respective second free ends of the first and second fitting parts, The two free ends of the outer part also circumferentially surround the second free ends of the first and second fitting parts, respectively; At least first and second resilient gasket members are respectively movably disposed between a first free end of the outer member and a free end of the first or second pipe joint, and a second free end of the outer member part and the other free end of the first or second pipe joint, use these two elastic gasket parts to absorb the vibration from any one of the first and second pipes and prevent the vibration from being transmitted to the other pipe son, at least first and second resilient gasket members radially surround at least two free ends of the outer member and the respective first and second pipe joint member free ends, Also at least a portion of each of the at least first and second resilient washer parts is movably arranged to move axially relative to at least one of the outer part and the first and second fitting parts, respectively. ;as well as, An elastic sealing member not directly fixed to at least the first and second pipes is used to prevent fluid from escaping from the flexible coupling device and to maintain the mutual flexible connection between the first and second pipes, capable of adjusting the first and second pipes Mutual axial compression and extension movement of the second tubes adjusts the orientation of the tubes so that their longitudinal axes are in a non-intersecting relationship. twenty two. A flexible coupling device as claimed in claim 21, further comprising: At least one stop member is movably disposed within the outer member and is movably configured to prevent direct axial butt contact between the first and second pipe joint members. twenty three. 21. A flexible coupling device as claimed in claim 21, wherein the resilient sealing member further comprises a flexible tubular bellows member having a plurality of circumferential corrugations along the length of the bellows member. twenty four. A flexible coupling device as claimed in claim 21, wherein each gasket member comprises: An elastic loop member made of wire mesh material. 25． A flexible coupling device as claimed in claim 1, wherein each gasket member comprises: An elastic annular member made of ceramic fiber material. 26． A flexible coupling device as claimed in claim 21, wherein at least one of said at least two gasket members comprises: A resilient, substantially annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 27． A flexible coupling device as claimed in claim 22, wherein at least one of said at least one stop member comprises: A resilient, substantially annular member has an axial width around its circumference, wherein in at least one region along the circumference its axial width is substantially greater than in other regions along the circumference. 28． 26. A flexible coupling device as claimed in claim 26, wherein at least one washer member is secured to the outer member. 29． 27. A flexible coupling arrangement as claimed in claim 27, wherein at least one stop member is secured to the outer member.